WO2023020481A1

WO2023020481A1 - Method for transmitting data and apparatus

Info

Publication number: WO2023020481A1
Application number: PCT/CN2022/112754
Authority: WO
Inventors: 金辉; 窦凤辉
Original assignee: 华为技术有限公司
Priority date: 2021-08-20
Filing date: 2022-08-16
Publication date: 2023-02-23
Also published as: CN115708369A

Abstract

The present application provides a method for transmitting data, and a communication apparatus. In the method, when a first media is transferred from a first terminal to a second terminal, a first access network device may be used as an anchor point to change a data transmission channel between an access network device and a terminal; that is, a data transmission channel between an application server and the first access network device is kept unchanged, and the data transmission between an access network device and a terminal is converted from the first access network device to the first terminal into the first access network device to the second terminal, thereby implementing the transfer of the first media from the first terminal to the second terminal. In addition, in the method, after the transfer of the first media is completed, the first terminal may exit or maintain data transmission of the first media. The method can ensure that the data transmission of the first media is not interrupted, thereby facilitating the improvement of user experience.

Description

Method and device for transmitting data

This application requires submission to the China Patent Office on August 20, 2021, the application number is 202110959130.8, and the Chinese patent application titled "A Method for Moving Media on Devices" is submitted to the China Patent Office on November 02, 2021 , application number 202111288611.7, application title "Method and Apparatus for Transmission of Data", the priority of the Chinese patent application, the entire contents of which are incorporated in this application by reference.

technical field

The present application relates to the field of communications, and more particularly, to a method and apparatus for transmitting data.

Background technique

With the development of electronic technology, users own or use more and more electronic devices at the same time. For example, users may simultaneously own or use electronic devices with communication capabilities such as mobile phones, tablet computers, televisions, computers, or watches. In this case, a user may have a need to transfer certain media from one electronic device to another. In response to this demand, how to transfer media from one electronic device to another has become an urgent problem to be solved.

Contents of the invention

The present application provides a method and a communication device for transmitting data, which can use the access network equipment as the anchor point, and realize the transfer of media from one terminal to another terminal by changing the data transmission channel between the access network equipment and the terminal. transfer.

In a first aspect, the present application provides a method for transmitting data, the method comprising: the first terminal determines to transfer the first media to the second terminal; the first terminal sends the first media to the first access network device information, the first information is used to request to transfer the first media to the second terminal, the first information includes the identifier of the second terminal and the identifier of the first session of the first terminal , and an identifier of a first quality of service (quality of service, QoS) flow of the first session, where the first session and the first QoS flow are used by the first terminal to transmit data of the first media.

In the above technical solution, when the first terminal transfers the first media to the second terminal, the first terminal transfers the identifier of the second terminal and the identifier of the first session of the first terminal used to transmit the data of the first media The identifier of the first QoS flow with the first session is sent to the first access network device, so that the first access network device can modify the context of the first terminal and the context of the second terminal according to the received information, so as to implement the The data transmission channel of the first QoS of the first session of a terminal is converted from the first access network device to the first terminal to the first access network device to the second terminal, realizing the transfer of the first media from the first terminal to the second terminal transfer.

In addition, in the above technical solution, after the transfer of the first media is completed, the first terminal can quit or maintain the data transmission of the first media. This method can ensure that the data transmission of the first media is not interrupted, which helps to improve user experience.

With reference to the first aspect, in a possible implementation manner, the method further includes: the first terminal sends second information to the second terminal, and the second information is used to request sending the second terminal transfer media; the first terminal receives third information from the second terminal, where the third information includes at least one of the following information: the identity of the cell where the second terminal is located, the identity of the second terminal , and an identifier of a second session allocated by the second terminal, where the second session is used for the second terminal to transmit the data of the first media.

Optionally, after sending the first information to the first access network device, the first terminal sends the second information to the second terminal.

In the above technical solution, the first terminal may obtain information required for transferring the first media from the second terminal, and then send the first information to the first access network device according to the obtained information, thereby realizing the transfer of the first media from Transfer from a first terminal to a second terminal.

With reference to the first aspect or any implementation manner thereof, in another possible implementation manner, the identifier of the second session is encrypted.

In the above technical solution, the identifier of the second session is encrypted, which can improve the legality of transferring the first media to the second terminal.

With reference to the first aspect or any implementation thereof, in another possible implementation, when the third information includes the identifier of the second session, the first information further includes an identifier of the second session logo.

In other words, a session identifier is allocated by the second terminal, and the session corresponding to the session identifier is used for the second terminal to transmit the first media data transferred from the first terminal to the second terminal.

With reference to the first aspect or any implementation thereof, in another possible implementation, when the third information includes the identity of the cell where the second terminal is located, the method further includes: the first The terminal determines, according to the identifier of the cell where the second terminal is located, that the second terminal resides on the first access network device.

In the above technical solution, the first terminal determines that the first terminal and the second terminal reside in the same access network device according to the identity of the cell where the second terminal is located fed back by the second terminal, which can avoid the The transfer fails due to the camping of access network devices on different access networks.

With reference to the first aspect or any implementation manner thereof, in another possible implementation manner, the second information further includes an identifier of the first medium.

With reference to the first aspect or any implementation manner thereof, in another possible implementation manner, the first information further includes an identifier of the first medium.

With reference to the first aspect or any implementation manner thereof, in another possible implementation manner, the first terminal sending the first information to the first access network device includes: the first terminal sends the first information to the first access network device by A first access and mobility management function (access and mobility management function, AMF) serving the first terminal sends the first information to the first access network device.

In a second aspect, the present application provides a method for transmitting data. The method includes: a second terminal acquires first uplink data of a first medium, and the first medium is transferred from the first terminal to the second uplink data. media of two terminals; the second terminal determines to send the first uplink data through the second QoS flow of the second session according to the context information of the second QoS flow of the second session; the second terminal determines to send the first uplink data according to the second QoS flow of the second session; A corresponding relationship, sending the first uplink data to the first access network device through a second data radio bearer (data radio bearer, DRB), where the first corresponding relationship includes the second session of the second session The corresponding relationship between two QoS flows and the second DRB, the context information of the second session is determined according to the context information of the first session of the first terminal, and the context information of the second QoS flow is determined according to the context information of the first session The first session and the first QoS flow are determined by the context information of the first QoS flow of the first session, and the first session and the first QoS flow are used for the first terminal to transmit the data of the first media.

In a possible implementation manner, the second terminal determines to send the first uplink data through the second QoS flow of the second session according to the QoS rule in the context information of the second QoS flow of the second session.

In the above technical solution, the second terminal uses the second QoS stream of the second session to transmit the data of the first media. Because the context of the second session is determined according to the context information of the first session of the first terminal used to transmit the data of the first media, and the context of the second QoS flow is determined according to the context information of the first QoS flow of the first session It is determined, therefore, the second terminal can correctly transmit the data of the first media, so as to realize the transfer of the first media from the first terminal to the second terminal.

With reference to the second aspect, in a possible implementation manner, the method further includes: the second terminal acquires fourth information from the first access network device, where the fourth information includes: the second The identifier of the session, the identifier of the second QoS flow, the context information of the first session, and the context information of the first QoS flow; the second terminal determines the information of the second session according to the fourth information The context information and the context information of the second QoS flow, and generating the first corresponding relationship.

It should be noted that the context of the second session and the context of the second QoS flow may be locally generated by the second terminal, or may be configured by the first access network device for the second terminal, which are not limited in this application.

With reference to the second aspect or any implementation manner thereof, in another possible implementation manner, the method further includes: the second terminal receiving second information from the first terminal, the second information It is used to request to transfer media to the second terminal; the second terminal sends third information to the first terminal, where the third information includes at least one of the following information: the identity of the cell where the second terminal is located , the identifier of the second terminal, and the identifier of the second session.

With reference to the second aspect or any implementation manner thereof, in another possible implementation manner, the second information further includes an identifier of the first medium.

With reference to the second aspect or any implementation thereof, in another possible implementation, the fourth information further includes at least one of the following information: context information of the second DRB, and the first Media ID.

With reference to the second aspect or any implementation thereof, in another possible implementation, the method further includes: the second terminal receives fifth information, and the fifth information is used to ask whether to agree to transfer the The first medium is transferred to the second terminal; the second terminal sends sixth information, where the sixth information is used to indicate that the first medium is agreed to be transferred to the second terminal.

In the above technical solution, by asking the second terminal whether to agree to transfer the first media from the first terminal to the second terminal, it is helpful to avoid the influence of the misoperation of the first terminal on the second terminal, so that the first The media transfer process is more accurate.

With reference to the second aspect or any implementation manner thereof, in another possible implementation manner, the receiving the fifth information by the second terminal includes: the receiving by the second terminal from the first access network device The fifth information; or, the second terminal receives the fifth information from the first access and mobility management function AMF that provides services for the first terminal.

With reference to the second aspect or any implementation manner thereof, in another possible implementation manner, the sixth information further includes an identifier of the second session.

In other words, the second terminal may provide the identifier of the second session to the first access network device or the first AMF during the inquiry process of the first access network device or the first AMF.

With reference to the second aspect or any implementation manner thereof, in another possible implementation manner, the identifier of the second session is encrypted.

With reference to the second aspect or any implementation thereof, in another possible implementation, when the second terminal enters the coverage of the second access network device from the coverage of the first access network device , or when the first terminal enters the coverage of a third access network device from the coverage of the first access network device, the method further includes: the second terminal acquires the first medium of the first media Two uplink data; the second terminal determines to send the second uplink data through the third QoS flow of the third session according to the context information of the third QoS flow of the third session; the second terminal determines according to the context information of the third QoS flow of the third session The second correspondence is to send the second uplink data to the first access network device through a third DRB, where the second correspondence includes the third QoS flow of the third session and the The corresponding relationship of the third DRB, wherein the context information of the third session is determined according to the context information of the first session, and the context information of the third QoS flow is determined according to the context information of the first QoS flow It is determined that the context information of the third DRB is determined according to the context information of the second DRB.

In a possible implementation manner, the second terminal determines to send the second uplink data through the third QoS flow of the third session according to the QoS rule in the context information of the third QoS flow of the third session.

In the above technical solution, after the first medium is transferred from the first terminal to the second terminal, if the first terminal or the second terminal leaves the coverage of the first access network device, the second terminal can communicate with the second terminal through the second terminal. The third QoS stream of the third session between the application servers transmits the data of the first media, thereby ensuring that the transmission of the data of the first media is not interrupted.

With reference to the second aspect or any implementation thereof, in another possible implementation, the method further includes: the second terminal determines the context of the third session according to the context information of the second session information, and/or, the second terminal determines the context information of the third QoS flow according to the context information of the second QoS flow, and/or, the second terminal determines the context information of the second DRB according to the context information of the second DRB The third DRB context information; the second terminal generating the second correspondence.

In the above technical solution, the context information of the third session is determined according to the context information of the second session, the context information of the third QoS is determined according to the context information of the second QoS, and the context of the second session is determined according to the first The context information of the first session of the terminal used to transmit the data of the first media is determined, and the context of the second QoS flow is determined according to the context information of the first QoS flow of the first session, therefore, the second terminal can correctly The data of the first medium is transmitted, thereby ensuring that the transmission of the data of the first medium is not interrupted.

With reference to the second aspect or any implementation thereof, in another possible implementation, the second terminal determines the third session context information according to the context information of the second session, and/or, The second terminal determines the third QoS flow context information according to the context information of the second QoS flow, and/or, the second terminal determines the third DRB context according to the second DRB context information Before the information is sent, the method further includes: the second terminal determines that the third session and/or the third QoS flow and/or the third DRB does not exist.

In the above technical solution, the second terminal determines whether the third session and/or the third QoS flow and/or the third DRB already exists, only when the third session is not established, the third QoS flow of the third session is not established, or A session establishment process, a QoS flow establishment process, or a DRB configuration process is performed only when the third DRB is not configured. Therefore, signaling overhead and resource waste can be reduced.

With reference to the second aspect or any implementation thereof, in another possible implementation, the method further includes: the second terminal sending seventh information to the first access network device, the first The seven information is used to indicate that the second DRB corresponds to the third QoS flow of the third session of the second terminal.

In a third aspect, the present application provides a method for transmitting data, the method comprising: a first access network device receiving a first quality of service (QoS) stream of a first session of a first terminal receiving a first For downlink data, the first medium is the medium transferred from the first terminal to the second terminal; the first access network device uses the second data wireless bearer of the second terminal according to the third corresponding relationship The DRB sends the first downlink data to the second terminal, where the third correspondence includes the first QoS flow of the first session of the first terminal and the first QoS flow of the second terminal The corresponding relationship of the second DRB.

In the above technical solution, the data transmission channel between the access network device and the terminal is changed with the first access network device as the anchor point, that is, the data transmission channel between the application server and the first access network device is kept unchanged, Convert the data transmission between the access network device and the terminal from the first access network device to the first terminal to the first access network device to the second terminal, realizing the transmission of the first medium from the first terminal to the second terminal transfer.

In addition, in this technical aspect, after the transfer of the first media is completed, the first terminal can exit or maintain the data transmission of the first media. This method can ensure that the data transmission of the first media is not interrupted, which helps to improve user experience.

With reference to the third aspect, in a possible implementation manner, the method further includes: receiving, by the first access network device, the first information of the first media sent by the second terminal through the second DRB. Uplink data: the first access network device sends the first uplink data through the first QoS flow of the first session of the first terminal according to a fourth correspondence, wherein the fourth The correspondence includes a correspondence between the second DRB of the second terminal and the first QoS flow of the first session of the first terminal.

With reference to the third aspect or any implementation manner thereof, in another possible implementation manner, the method further includes: the first access network device receiving first information from the first terminal, the The first information is used to request to transfer the first media to the second terminal, and the first information includes an identifier of the second terminal, an identifier of the first session, and an identifier of the first QoS flow identification; the first access network device generates the third correspondence in the context of the first terminal according to the first information, and/or generates the third correspondence in the context of the second terminal The fourth correspondence.

In the above technical solution, when the first terminal transfers the first media to the second terminal, the first terminal transfers the identifier of the second terminal and the identifier of the first session of the first terminal used to transmit the data of the first media The identifier of the first QoS flow with the first session is sent to the first access network device, and the first access network device can modify the context of the first terminal and the context of the second terminal according to the received information, thereby implementing the The data transmission channel of the first QoS of the first session of a terminal is converted from the first access network device to the first terminal to the first access network device to the second terminal, realizing the transfer of the first media from the first terminal to the second terminal transfer.

With reference to the third aspect or any implementation manner thereof, in another possible implementation manner, the first access network device receiving the first information from the first terminal includes: the first access network device The first information is received through the first AMF that provides services for the first terminal.

With reference to the third aspect or any implementation thereof, in another possible implementation, the method further includes: the first access network device acquiring eighth information, where the eighth information includes the first Context information of a session and context information of the first QoS flow; the first access network device sends fourth information to the second terminal, where the fourth information includes: the identifier of the second session, the second The identifier of the QoS flow, the context information of the first session, and the context information of the first QoS flow, wherein the second QoS flow of the second session is used by the second terminal to transmit the first media data, the context information of the first session is used by the second terminal to determine the context of the second session, and the context information of the first QoS flow is used by the second terminal to determine the second QoS The context of the stream.

In the above technical solution, the first access network device provides the second terminal with information for determining the context of the second session and the context of the second QoS flow, and the second session and the second QoS flow are used to transmit the first media data, so that the second terminal can complete the grouping and transmission of the data of the first media.

With reference to the third aspect or any implementation manner thereof, in another possible implementation manner, the acquiring the eighth information by the first access network device includes: The first AMF serving the terminal acquires the eighth information.

With reference to the third aspect or any implementation thereof, in another possible implementation, the fourth information further includes at least one of the following information: context information of the second DRB, and the first Media ID.

With reference to the third aspect or any implementation manner thereof, in another possible implementation manner, the first information further includes at least one of the following information: the identifier of the second session, and the first media logo.

With reference to the third aspect or any implementation manner thereof, in another possible implementation manner, the method further includes: the first access network device sending fifth information to the second terminal, the first The fifth message is used to ask whether to agree to transfer the first media to the second terminal; the first access network device receives sixth information from the second terminal, and the sixth message is used to indicate consent transferring the first medium to the second terminal.

With reference to the third aspect or any implementation manner thereof, in another possible implementation manner, the sixth information further includes an identifier of the second session.

With reference to the third aspect or any implementation manner thereof, in another possible implementation manner, the identifier of the second session is encrypted.

With reference to the third aspect or any implementation thereof, in another possible implementation, when the first terminal enters the coverage of the third access network device from the coverage of the first access network device When , the method further includes: the first access network device receives the second downlink data of the first media through the third QoS flow of the third session of the second terminal; the first access network The device sends the second downlink data to the second terminal through the third DRB of the second terminal according to the fifth correspondence, where the fifth correspondence includes the third DRB of the second terminal The correspondence between the third QoS flow of the session and the third DRB of the second terminal; wherein, the context information of the third session is determined according to the context information of the first session, and the first session The context information of the three QoS flows is determined according to the context information of the first QoS flow, and the context information of the third DRB is determined according to the context information of the second DRB.

In the above technical solution, after the first medium is transferred from the first terminal to the second terminal, if the first terminal or the second terminal leaves the coverage of the first access network device, the first access network device can The third QoS stream of the third session between the two terminals and the application server transmits the data of the first media, thereby ensuring that the transmission of the data of the first media is not interrupted.

With reference to the third aspect or any implementation thereof, in another possible implementation, when the first terminal enters the coverage of the third access network device from the coverage of the first access network device , the method further includes: the first access network device receiving the second uplink data of the first medium sent by the second terminal through the third DRB; the first access network device according to A fifth correspondence, sending the second uplink data through the third QoS flow of the third session of the second terminal, where the fifth correspondence includes the first The corresponding relationship between the third QoS flow of the three sessions and the third DRB of the second terminal.

With reference to the third aspect or any implementation thereof, in another possible implementation, when the second terminal enters the coverage of the second access network device from the coverage of the first access network device , or when the first terminal enters the coverage of a third access network device from the coverage of the first access network device, the method further includes: the first access network device according to the second The context information of the second session of the terminal and/or the context information of the second QoS flow of the second session determine the context of the third session and/or the context of the third QoS flow, wherein the second session and the second QoS flow is used by the second terminal to transmit the first media data, the context information of the second session is determined according to the context information of the first session, and the second QoS flow The context is determined according to the context information of the first QoS flow; the first access network device determines the context information of the third DRB according to the context information of the second DRB.

With reference to the third aspect or any implementation manner thereof, in another possible implementation manner, the method further includes: the first access network device receiving seventh information from the second terminal, the The seventh information is used to indicate that the second DRB corresponds to the third QoS flow of the third session of the second terminal.

With reference to the third aspect or any implementation manner thereof, in another possible implementation manner, the method further includes: the first access network device providing a second access network device that provides services for the second terminal Sending tenth information with the mobility management function AMF, where the tenth information is used to request to modify the Internet protocol (Internet protocol, IP) address of the data corresponding to the first QoS flow of the first session to the first Three session IP addresses.

In the above technical solution, the first access network device requests to modify the IP address of the data corresponding to the first QoS flow of the first session to the IP address of the third session, so that the data corresponding to the first QoS flow of the first session can Transmitted through the third session.

With reference to the third aspect or any implementation thereof, in another possible implementation, when the second terminal enters the coverage of the second access network device from the coverage of the first access network device When , the method further includes: the first access network device receives the third downlink data of the first media through the first QoS flow of the first session; the first access network device receives the third downlink data of the first media according to A sixth correspondence, sending the third downlink data to the second access network device through the first forwarding tunnel, where the sixth correspondence includes the first QoS flow of the first session and the Describe the corresponding relationship of the first forwarding tunnel.

In the above technical solution, when the second terminal enters the coverage area of the second access network device from the coverage area of the first access network device, the first access network device can communicate with the second access network device The forwarding tunnel forwards the received first media data to the second access network device, and further sends it to the second terminal by the second access network device, so as to ensure that the transmission of the first media data is not interrupted.

With reference to the third aspect or any implementation thereof, in another possible implementation, when the second terminal enters the coverage of the second access network device from the coverage of the first access network device , the method further includes: the first access network device receiving the third uplink data of the first media sent by the second access network device through the first forwarding tunnel; the first access network device The network access device sends the third uplink data through the first QoS flow of the first session of the first terminal according to the sixth correspondence, where the sixth correspondence includes the first session The corresponding relationship between the first QoS flow and the first forwarding tunnel.

In the above technical solution, when the second terminal enters the coverage area of the second access network device from the coverage area of the first access network device, the first access network device may communicate with the second terminal The data of the first media received by the forwarding tunnel is forwarded to the user plane functional network element, so as to ensure that the transmission of the data of the first media is not interrupted.

With reference to the third aspect or any implementation thereof, in another possible implementation, the fourth correspondence further includes a second QoS flow of a second session between the second DRB and the second terminal The method further includes: the first access network device establishes the first forwarding tunnel according to the fourth correspondence, and generates the sixth correspondence in the context of the first terminal relation.

With reference to the third aspect or any implementation thereof, in another possible implementation, when the first terminal enters the coverage of the third access network device from the coverage of the first access network device , the method further includes: the first access network device receiving the fourth downlink data of the first media sent by the third access network device through the second forwarding tunnel; the first access network The device sends the fourth downlink data to the second terminal through the second DRB according to the seventh correspondence, where the seventh correspondence includes the second forwarding tunnel and the correspondence between the second DRB relation.

In the above technical solution, when the first terminal enters the coverage area of the third access network device from the coverage area of the first access network device, the first access network device may communicate with the third access network device The data of the first media received by the forwarding tunnel is forwarded to the second terminal, so as to ensure that the transmission of the data of the first media is not interrupted.

With reference to the third aspect or any implementation thereof, in another possible implementation, when the first terminal enters the coverage of the third access network device from the coverage of the first access network device , the method further includes: the first access network device receiving fourth uplink data of the first medium sent by the second terminal through the second DBR; the first access network device according to the first Seven correspondences, sending the fourth uplink data to the third access network device through the second forwarding tunnel, where the seventh correspondence includes the second forwarding tunnel and the second DRB Correspondence.

In the above technical solution, when the first terminal enters the coverage area of the third access network device from the coverage area of the first access network device, the first access network device may transfer the data of the first media from the second terminal to , forward to the third access network device through the forwarding tunnel with the third access network device, and then send it to the user plane functional network element by the third access network device, so as to ensure that the transmission of the data of the first media interruption.

With reference to the third aspect or any implementation thereof, in another possible implementation, the method further includes: establishing, by the first access network device, the second forwarding tunnel, and generate the seventh correspondence in the context of the second terminal.

In a fourth aspect, the present application provides a method for transmitting data, the method comprising: when the second terminal enters the coverage of the second access network device from the coverage of the first access network device, the The second access network device receives the third downlink data of the first media sent by the first access network device through the first forwarding tunnel, where the first media is the media transferred from the first terminal to the second terminal , the first terminal resides in the first access network device; the second access network device sends the second terminal to the second terminal through a third data radio bearer DRB according to the eighth correspondence 3. Downlink data, wherein the eighth correspondence includes a correspondence between the first forwarding tunnel and the third DRB.

In the above technical solution, when the second terminal enters the coverage area of the second access network device from the coverage area of the first access network device, the second access network device may communicate with the first access network device The forwarding tunnel receives the data of the first media and sends it to the second terminal, thereby ensuring that the transmission of the data of the first media is not interrupted.

With reference to the fourth aspect, in a possible implementation manner, the method further includes: receiving, by the second access network device, a third message of the first media sent by the second terminal through the third DRB. Uplink data: the second access network device sends the third uplink data to the first access network device through the first forwarding tunnel according to the eighth correspondence.

In the above technical solution, when the second terminal enters the coverage area of the second access network device from the coverage area of the first access network device, the second access network device may transfer the data of the first media from the second terminal to is forwarded to the first access network device through the forwarding tunnel with the first access network device, and then sent to the user plane functional network element by the first access network device, so as to ensure that the transmission of the data of the first media does not interruption.

With reference to the fourth aspect or any implementation thereof, in another possible implementation, the method further includes: establishing, by the second access network device, the first forwarding tunnel; The network device generates the eighth correspondence in the context of the second terminal.

In a fifth aspect, the present application provides a method for transmitting data, the method comprising: when the first terminal enters the coverage of the third access network device from the coverage of the first access network device, the The third access network device receives the fourth downlink data of the first media through the first quality of service QoS flow of the first session of the first terminal, and the first media is transferred from the first terminal to the second terminal media; the third access network device sends the fourth downlink data to the first access network device through a second forwarding tunnel according to the ninth correspondence, wherein the ninth correspondence includes the The corresponding relationship between the first QoS flow of the first session of the first terminal and the second forwarding tunnel, where the second terminal resides in the first access network device.

In the above technical solution, when the first terminal enters the coverage area of the third access network device from the coverage area of the first access network device, the third access network device can communicate with the first access network device The forwarding tunnel forwards the received first media data to the first access network device, and further sends it to the second terminal by the first access network device, so as to ensure that the transmission of the first media data is not interrupted.

With reference to the fifth aspect, in a possible implementation, the method further includes: the third access network device receiving the first access network device sent by the first access network device through the second forwarding tunnel. Fourth uplink data of media; the third access network device sends the fourth uplink data through the first QoS flow of the first session of the first terminal according to the ninth correspondence.

In the above technical solution, when the first terminal enters the coverage area of the third access network device from the coverage area of the first access network device, the third access network device may communicate with the first access network device The data of the first media received by the forwarding tunnel is forwarded to the functional network element of the user plane, so as to ensure that the transmission of the data of the first media is not interrupted.

With reference to the fifth aspect or any implementation thereof, in another possible implementation, the method further includes: establishing the second forwarding tunnel by the third access network device; The network device generates the nine correspondences in the context of the first terminal.

In a sixth aspect, the present application provides a method for transmitting data, the method comprising: when the second terminal enters the coverage area of the second access network device from the coverage area of the first access network device, the second terminal The access and mobility management function AMF receives tenth information from the first access network device, and the tenth information is used to request the Internet protocol of the data corresponding to the first quality of service QoS flow of the first session of the first terminal The IP address is changed to the IP address of the third session, the first QoS flow of the first session is used by the first terminal to transmit the data of the first media, and the first media is transferred from the first terminal to the the media of the second terminal, the second terminal is served by the second AMF; the second AMF acquires the IP address of the third session; the second AMF sends the service to the first terminal The first AMF sends eleventh information, where the eleventh information is used to request to modify the IP address of the data corresponding to the first QoS flow of the first session of the first terminal to the third session the IP address of the third session, the eleventh information includes the IP address of the third session.

In the above technical solution, the second AMF requests to modify the IP address of the data corresponding to the first QoS flow of the first session to the IP address of the third session, so that the data corresponding to the first QoS flow of the first session can pass through the third Session transfer.

In a seventh aspect, the present application provides a method for transmitting data, the method includes: the first access and mobility management function AMF receives eleventh information from the second AMF, and the eleventh information is used In order to request to modify the Internet Protocol IP address of the data corresponding to the first quality of service QoS flow of the first session of the first terminal to the IP address of the third session, the eleventh information includes the IP address of the third session; The first AMF sends the eleventh information to the first UPF.

In the above technical solution, the first AMF requests to modify the IP address of the data corresponding to the first QoS flow of the first session to the IP address of the third session, so that the data corresponding to the first QoS flow of the first session can pass through the third Session transfer.

In an eighth aspect, the present application provides a communication device, the device is configured to execute the method provided by any one of the above aspects or its implementation manner. Specifically, the apparatus may include a unit and/or module, such as a processing unit and/or a communication unit, for performing the method provided by any of the above aspects or its implementation manner.

In an implementation manner, the apparatus is a first terminal, a second terminal, a first access network device, a second access network device, a third access network device, a first AMF, or a second AMF. When the device is a first terminal, a second terminal, a first access network device, a second access network device, a third access network device, a first AMF, or a second AMF, the communication unit may be a transceiver, Or, an input/output interface; the processing unit may be at least one processor. Optionally, the transceiver is a transceiver circuit. Optionally, the input/output interface is an input/output circuit.

In another implementation manner, the apparatus is used for the first terminal, the second terminal, the first access network device, the second access network device, the third access network device, the first AMF, or the second AMF chips, systems on chips or circuits in When the device is a chip used in the first terminal, second terminal, first access network device, second access network device, third access network device, first AMF, or second AMF, a chip system or In the case of a circuit, the communication unit may be the input/output interface, interface circuit, output circuit, input circuit, pin or related circuit on the chip, chip system or circuit; the processing unit may be at least one processor, processing circuit or logic circuit etc.

In a ninth aspect, the present application provides a communication device, which includes: a memory for storing programs; at least one processor for executing the computer programs or instructions stored in the memory to perform any of the above aspects or its implementation provided method.

In an implementation manner, the apparatus is a first terminal, a second terminal, a first access network device, a second access network device, a third access network device, a first AMF, or a second AMF.

In another implementation manner, the apparatus is used for the first terminal, the second terminal, the first access network device, the second access network device, the third access network device, the first AMF, or the second AMF chips, systems on chips or circuits in

In a tenth aspect, the present application provides a processor configured to execute the methods provided in the foregoing aspects.

For the sending and obtaining/receiving operations involved in the processor, if there is no special description, or if it does not conflict with its actual function or internal logic in the relevant description, it can be understood as the processor's output and reception, input and other operations , can also be understood as the sending and receiving operations performed by the radio frequency circuit and the antenna, which is not limited in this application.

In an eleventh aspect, the present application provides a computer-readable storage medium, where the computer-readable medium stores program code for device execution, and the program code includes a method for executing any one of the above aspects or its implementation.

In a twelfth aspect, the present application provides a computer program product containing instructions. When the computer program product is run on a computer, it causes the computer to execute the method provided by any one of the above aspects or its implementation.

In a thirteenth aspect, the present application provides a chip. The chip includes a processor and a communication interface. The processor reads the instructions stored in the memory through the communication interface, and executes the method provided by any one of the above aspects or its implementation.

Optionally, as an implementation, the chip further includes a memory, in which computer programs or instructions are stored, and the processor is used to execute the computer programs or instructions stored in the memory, and when the computer programs or instructions are executed, the processor is used to execute The method provided by any one of the above aspects or its implementation.

In a fourteenth aspect, the present application provides a communication system, including the first terminal, the second terminal, the first access network device, the second access network device, the third access network device, the first AMF, or Second AMF.

Description of drawings

Fig. 1 shows a schematic diagram of a network architecture.

FIG. 2 is a schematic diagram of a method 200 for transmitting data provided by an embodiment of the present application.

FIG. 3 is a schematic diagram of a method 300 for transmitting data provided by an embodiment of the present application.

FIG. 4 is a schematic diagram of a method 400 for transmitting data provided by an embodiment of the present application.

FIG. 5 is a schematic diagram of a method 500 for transmitting data provided by an embodiment of the present application.

FIG. 6 is a schematic diagram of a method 600 for transmitting data provided by an embodiment of the present application.

Fig. 7 is a variation of the transmission path of the data of the first medium.

Fig. 8 is an example of the method for transmitting data provided by this application.

Fig. 9 is another example of the method for transmitting data provided by the present application.

Fig. 10 is another example of the method for transmitting data provided by this application.

Fig. 11 is another example of the method for transmitting data provided by this application.

Fig. 12 Another variation of the transmission path of the data of the first medium.

Fig. 13 is another example of the method for transmitting data provided by the present application.

Another variation of the data transmission path of the first medium in FIG. 14 .

Fig. 15 is another example of the method for transmitting data provided by this application.

Another variation of the transmission path of the data of the first medium in FIG. 16 .

Fig. 17 is another example of the method for transmitting data provided by this application.

Another variation of the data transmission path of the first medium in FIG. 18 .

Fig. 19 is another example of the method for transmitting data provided by this application.

Fig. 20 is a schematic structural diagram of the device provided by the embodiment of the present application.

Fig. 21 is another schematic structural diagram of the device provided by the embodiment of the present application.

Detailed ways

The technical solution in this application will be described below with reference to the accompanying drawings.

In order to facilitate the understanding of the technical solution of the present application, the following explanations are made.

First, in this application, "for" can be understood as "enabling", and "enabling" can include direct enabling and indirect enabling. When describing a certain information for enabling A, it may include that the information directly enables A or indirectly enables A, but it does not mean that A must be carried in the information.

Second, the first, second and various numbers shown in this application (for example, "#1", "#2", etc.) The scope of the application examples. For example, to distinguish different information, etc. It is not intended to describe a particular order or sequence. It is to be understood that the terms so described are interchangeable under appropriate circumstances in order to enable descriptions other than the embodiments of the application.

Third, in this application, "preset" may include pre-definition, for example, protocol definition. Among them, "pre-defined" can be realized by pre-saving corresponding codes, tables or other methods that can be used to indicate related information in devices (for example, including terminals or network devices), and this application does not limit its specific implementation .

Fourth, the "protocol" involved in the embodiment of the present application may refer to a standard protocol in the communication field, for example, it may include the fifth generation (5th generation, 5G), new air interface (new radio, NR) protocol and future communication The relevant protocols in the system are not limited in this application.

The technical solution provided by this application can be applied to various communication systems, such as: the fifth generation (5th generation, 5G) or new radio (new radio, NR) system, long term evolution (long term evolution, LTE) system, LTE frequency division Duplex (frequency division duplex, FDD) system, LTE time division duplex (time division duplex, TDD) system, etc. The technical solution provided by this application can also be applied to future communication systems, such as the sixth generation mobile communication system. The technical solution provided by this application can also be applied to device to device (device to device, D2D) communication, vehicle to everything (vehicle-to-everything, V2X) communication, machine to machine (machine to machine, M2M) communication, machine type Communication (machine type communication, MTC), and Internet of things (internet of things, IoT) communication system or other communication systems.

First, briefly introduce the network architecture applicable to this application.

As an example, Fig. 1 shows a schematic diagram of a network architecture.

As shown in Figure 1, the network architecture takes the 5G system (the 5th generation system, 5GS) as an example. The network architecture may include three parts, namely a user equipment (user equipment, UE) part, a data network (data network, DN) part, and an operator network part. Wherein, the operator network may include one or more of the following network elements: (wireless) access network ((radio) access network, (R) AN) equipment, user plane function (user plane function, UPF) network element, An AMF network element, a session management function (session management function, SMF) network element, and a unified data management (unified data management, UDM) network element. In the above operator network, the part other than the (R)AN part may be referred to as the core network part. In this application, user equipment, (wireless) access network equipment, UPF network elements, AMF network elements, SMF network elements, and UDM network elements are referred to as UE, (R)AN equipment, UPF, AMF, SMF, and UDM respectively. .

Each network element involved in FIG. 1 is briefly described below.

1. UE

The UE mainly accesses the 5G network through the wireless air interface and obtains services. The UE interacts with the RAN through the air interface, and interacts with the AMF of the core network through non-access stratum signaling (non-access stratum, NAS).

The UE in this embodiment of the present application may also be referred to as a terminal device, user, access terminal, subscriber unit, subscriber station, mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, terminal, wireless communication device, User Agent or User Device. A UE can be a cellular phone, a smart watch, a wireless data card, a mobile phone, a tablet computer, a personal digital assistant (PDA) computer, a wireless modem, a handheld device, a laptop computer, a machine type communication (MTC) ) terminals, computers with wireless transceiver functions, Internet of Things terminals, virtual reality terminal devices, augmented reality terminal devices, wearable devices, vehicles, terminals in device-to-device (D2D) communication, vehicles ( Terminals in vehicle to everything (V2X) communication, terminals in machine-type communication (MTC), terminals in Internet of Things (IOT), terminals in smart office, terminals in industrial control , terminals in unmanned driving, terminals in remote surgery, terminals in smart grids, terminals in transportation security, terminals in smart cities, terminals in smart homes, terminals in satellite communications (for example, satellite phones or satellite terminal). The UE may also be customer-premises equipment (CPE), telephone, router, network switch, residential gateway (residential gateway, RG), set-top box, fixed mobile convergence product, home network adapter, and Internet access gateway.

The embodiment of the present application does not limit the specific technology and specific equipment form adopted by the UE.

2. (R)AN equipment

The (R)AN device can provide authorized users in a specific area with the function of accessing the communication network. Specifically, it can include wireless network devices in the 3rd generation partnership project (3rd generation partnership project, 3GPP) network, and can also include non-3GPP (non- 3GPP) access point in the network. For the convenience of description, AN equipment is used below.

AN devices may use different wireless access technologies. There are currently two types of wireless access technologies: 3GPP access technologies (for example, wireless access technologies used in third generation (3rd generation, 3G), fourth generation (4th generation, 4G) or 5G systems) and non- 3GPP (non-3GPP) access technology. The 3GPP access technology refers to the access technology that complies with the 3GPP standard specifications. For example, the access network equipment in the 5G system is called the next generation Node Base station (gNB) or RAN equipment. Non-3GPP access technologies may include air interface technology represented by access point (AP) in wireless fidelity (WiFi), worldwide interoperability for microwave access (WiMAX), code Multiple access (code division multiple access, CDMA), etc. The AN device may allow non-3GPP technology interconnection and intercommunication between the terminal device and the 3GPP core network.

The AN device can be responsible for functions such as wireless resource management, quality of service (QoS) management, data compression and encryption on the air interface side. The AN device provides access services for the terminal device, and then completes the forwarding of control signals and user data between the terminal and the core network. For example, the AN device communicates with the UE through an air interface, and transmits and receives data with the UPF through a tunnel.

AN equipment may include, but not limited to, for example: a macro base station, a micro base station (also called a small station), a radio network controller (radio network controller, RNC), a node B (Node B, NB), a base station controller (base station controller) , BSC), base transceiver station (base transceiver station, BTS), home base station (for example, home evolved NodeB, or home Node B, HNB), baseband unit (baseband unit, BBU), AP in WiFi system, WiMAX in (base station, BS), wireless relay node, wireless backhaul node, transmission point (transmission point, TP) or sending and receiving point (transmission and reception point, TRP), etc., can also be used in 5G (eg, NR) system gNB or transmission point (TRP or TP), one or a group (including multiple antenna panels) antenna panels of the base station in the 5G system, or it can also be a network node that constitutes a gNB or transmission point, such as a distributed unit ( distributed unit, DU), or the base station in the next-generation communication 6G system, etc.

The embodiment of the present application does not limit the specific technology and specific device form adopted by the AN device.

For convenience of description, (R)AN devices are collectively referred to as base stations hereinafter.

3. UPF

UPF is a core network entity, which mainly provides user plane functions such as forwarding and processing of user packets, connection with DN, session anchor point, and quality of service (quality of service, QoS) policy enforcement. For example, the UPF can receive user plane data from the DN, and send the user plane data to the base station through the tunnel between the UPF and the base station. The UPF can also receive user plane data sent by the base station through the tunnel between the UPF and the base station, and forward it to the DN.

4. DN

The DN is mainly used in the operator's network that provides data services for the UE. For example, the Internet (Internet), a third-party service network, an IP multimedia service (IP multi-media service, IMS) network, and the like. An application server (application server, AS) may belong to a part of a DN network.

5. AMF

The AMF is a core network entity and is used to manage the registration process, mobility process, and reachability of the UE.

6. SMF

SMF is a core network entity, used to manage the protocol data unit (protocol data unit, PDU) session (session) of the UE, including the establishment, modification, and deletion of the PDU session, and the quality of service (QoS) in the PDU session ) flow (flow) establishment, modification, deletion, etc.

7. UDM

The UDM is a core network entity and is used to manage user subscription data. The function of UDM is similar to that of 4G home subscriber server (HSS). The UDM in Figure 1 can also be understood as a combination of UDM and HSS functions.

In the network architecture shown in FIG. 1 , various network elements can communicate through interfaces. The interface between network elements may be a point-to-point interface or a service interface, which is not limited in this application.

It should be understood that the network architecture shown above is only an example, and the network architecture applicable to the embodiment of the present application is not limited thereto, and any network architecture capable of realizing the functions of the foregoing network elements is applicable to the embodiment of the present application.

It should also be understood that the functions or network elements such as AMF, SMF, UPF, and UDM shown in FIG. 1 can be understood as network elements for implementing different functions, for example, they can be combined into network slices as required. These network elements can be independent devices, or can be integrated in the same device to achieve different functions, or can be network elements in hardware devices, or software functions running on dedicated hardware, or platforms (for example, cloud The virtualization function instantiated on the platform), this application does not limit the specific form of the above network elements.

It should also be understood that the above names are only defined for the convenience of distinguishing different functions, and shall not constitute any limitation to the present application. This application does not exclude the possibility of adopting other names in the 6G network and other networks in the future. For example, in a 6G network, some or all of the above network elements may use the terms in 5G, or may use other names.

To facilitate understanding of the embodiments of the present application, terms or technologies involved in the present application are briefly described.

1. Media

Media can be understood as a certain media of a certain application, such as a video call of a video application; or, it can be understood as all media of a certain application, such as all media of a video application, including video calls, voice calls, text transmission, picture transmission, etc.; or, it can be understood as a certain application, such as a video application.

Media can be identified by application identifier (APP ID); or, APP ID+media type to identify, where the media type can be: video call media, voice call media, text media, picture media, video playback media, or game media etc.

In this application, media can also be replaced by traffic flow, media flow, traffic, data flow, etc.

Transferring the media from the first terminal to the second terminal may be understood as converting the data of the first media received or sent by the first terminal to be received or sent by the second terminal.

2. Transmission of media data

The terminal can transmit media data with the AS through the access network device and UPF.

When it is necessary to transmit media data, the terminal can initiate the establishment of a PDU session with the AS. The context information of each PDU session includes at least one of the following: IP address (IP address), data network name (data network name, DNN), single network slice selection assistance information (single network slice selection assistance information, S-NSSAI), session And business continuity (session and service continuity, SSC) mode (SSC mode), and session aggregate maximum bit rate (aggregate maximum bit rate, AMBR) (Session AMBR), etc. A protocol data unit (protocol data unit, PDU) session can be identified by a PDU session ID (PDU session ID, PSI). Each PDU session includes at least one QoS flow. The context information of each QoS flow includes at least one of the following: 5G service quality identifier (5G QoS Identifier, 5QI), guaranteed flow bit rate (guaranteed flow bit rate, GFBR), maximum flow bit rate (maximum flow bit rate, MFBR), etc. QoS parameters. A QoS flow can be identified by a QoS flow ID (QoS flow ID, QFI). The combination of PSI and QFI can uniquely determine a QoS flow.

When the access network device configures the DRB of the terminal, it needs to carry PSI and QFI in the configuration information to indicate that the DRB can be used to transmit data of the QoS flow QFI of the PDU session PSI. The access network device can save the corresponding relationship between PSI, QFI and DRB in the context of the terminal. The terminal may also use the corresponding relationship between PSI, QFI and DRB.

For media uplink data, after the APP in the terminal generates the data, it matches the data to the corresponding PDU session PSI, and uses the IP address corresponding to the PDU session PSI to compose an IP packet. Further, the terminal uses the IP address corresponding to the PDU session PSI. The QoS rule matches the IP packet to the QoS flow QFI in the PDU session PSI, and uses the DRB corresponding to the QoS flow QFI to transmit to the access network device. After receiving the data sent by the terminal through the DRB, the access network device sends the data through the QoS flow QFI of the PDU session PSI according to the corresponding relationship between PSI, QFI and DRB.

For media downlink data, after receiving the data from the AS through the QoS flow QFI of the PDU session PSI, the access network device sends the data through the DRB according to the corresponding relationship between PSI, QFI and DRB.

In this paper, the PDU session PSI can be understood as the PDU session indicated by the PSI or the PDU session corresponding to the PSI or the PDU session whose PDU session identifier is PSI; the QoS flow QFI can be understood as the QoS flow indicated by the QFI or the QoS corresponding to the QFI The flow or QoS flow is identified as the QoS flow of QFI.

It should be noted that the above context information may also be described as configuration information, configuration parameters, parameters, context parameters, corresponding information, and the like. For example, the context information of the PDU session may also be replaced with configuration information of the PDU session, configuration parameters of the PDU session, parameters of the PDU session, context parameters of the PDU session, information corresponding to the PDU session, and the like. For another example, the context information of the QoS flow may also be replaced with configuration information of the QoS flow, configuration parameters of the QoS flow, parameters of the QoS flow, context parameters of the QoS flow, information corresponding to the QoS flow, and the like.

With the development of electronic technology, the number of electronic devices owned or used by users at the same time is increasing, and users have a need to transfer certain media from one electronic device to another electronic device. For the convenience of description, hereinafter, the electronic device transferring the media is called the first terminal, the electronic device transferring the media is called the second terminal, and the transferred (transferred or moved) media is called the first media.

In one solution, the first terminal establishes a direct communication path with the second terminal, and transfers the first media from the first terminal to the second terminal for display. For example, the media of the mobile phone is displayed through the tablet computer. For this solution, the first terminal needs to receive the data of the first media, and further, send the received data to the second terminal through a direct communication path, so the first terminal needs to always participate in the transmission process of the data of the first media . If the first terminal withdraws from the transmission of the data of the first media, the second terminal cannot continue to display the first media. The user experience is poor.

In another solution, the first terminal acquires the data of the first media through the application server. When transferring the first media to the second terminal, the second terminal can re-establish a connection with the application server for transmitting the data of the first media, and the first terminal can quit the transmission of the data of the first media. For example, the user uses a certain account to watch a video through the first terminal, and then opens the tablet computer to continue watching the video with the same account. Since the last playback position is saved on the account, the user can continue to watch. For this solution, when the second terminal re-establishes a connection with the application server, there is a problem of a long service interruption time, and the user experience is poor.

Therefore, how to improve user experience while transferring media from the first terminal to the second terminal has become an urgent problem to be solved.

In view of the above problems, the present application provides a method and a communication device for transmitting data, which can take the access network device as the anchor point, and realize the first media slave by changing the data transmission channel between the access network device and the terminal. The transfer from the first terminal to the second terminal, and after the transfer of the first media is completed, the first terminal can exit or maintain the data transmission of the first media, and ensure that the data transmission of the first media is not interrupted, which helps to improve user experience .

For ease of understanding, a scenario where the technical solution of the present application can be applied is described first.

scene 1

The first terminal transfers the first media to the second terminal. Both the first terminal and the second terminal reside in the first access network device. At this time, the first terminal and the second terminal may be in an idle state or a connected state, that is, the resident mentioned here may include the resident in the idle state or the resident in the connected state.

As an example, Scenario 1 may be: when a user uses a video call application on a tablet computer (first terminal) to make a video call, and uses a mobile phone (second terminal) to play a video using a video player, the user can use the tablet computer (first terminal) The ongoing video call on the terminal) is transferred to the mobile phone (the second terminal).

It should be noted that the present application does not limit the state of the second terminal, and the second terminal may be transmitting the media of the second terminal, or may not have an ongoing service.

scene 2

After the first terminal transfers the first medium to the second terminal, the second terminal leaves the coverage of the first access network device and enters the coverage of the second access network device.

As an example, scenario 2 may be: after the user transfers the media of the tablet computer (first terminal) to the mobile phone (second terminal), the user leaves with the mobile phone (second terminal).

scene 3

After the first terminal transfers the first media to the second terminal, the first terminal leaves the coverage of the first access network device and enters the coverage of the third access network device.

As an example, scenario 3 may be: after the user transfers the media of the tablet computer (first terminal) to the mobile phone (second terminal), the user leaves with the tablet computer (first terminal).

Here, entering the coverage of the second access network device can be understood as entering the coverage of the second access network device and residing in the cell of the second access network device; entering the coverage of the third access network device can be understood as Entering the coverage of the third access network device and staying in the cell of the third access network device. I won't go into details below.

The method for transmitting data provided by this application is described below.

For the above scenario 1, the present application proposes the method shown in FIG. 2 .

FIG. 2 is a schematic diagram of a method 200 for transmitting data provided by an embodiment of the present application. Method 200 may include at least some of the following.

Step 201, the first terminal determines to transfer the first media to the second terminal.

Wherein, both the first terminal and the second terminal reside in the first access network device.

Before transferring the first media to the second terminal, the first terminal transmits the data of the first media through the first DRB of the first terminal and the first QoS stream of the first session of the first terminal.

For example, after the first terminal generates the data of the first media, it matches the data to the first session, and uses the IP address corresponding to the first session to form an IP packet. Further, the first terminal uses the QoS rule corresponding to the first session to The IP packet is matched to the first QoS flow in the first session, and is transmitted to the access network device using the first DRB corresponding to the first QoS flow; after receiving the data sent by the first terminal through the first DRB, the first The access network device sends the data through the first QoS flow of the first PDU session according to the correspondence between the first QoS flow of the first session of the first terminal and the first DRB of the first terminal.

For another example, after the first access network device receives data from the AS through the first QoS flow of the first session of the first terminal, according to the first QoS flow of the first session of the first terminal and the first The corresponding relationship of the DRB, the data is sent to the first terminal through the first DRB of the first terminal.

In this application, the first QoS flow of the first session of the first terminal may be understood as the first QoS flow of the first session established between the first terminal and the AS. The first DRB of the first terminal may be understood as the first DRB configured by the access network device for the first terminal. Sessions, QoS flows and DRBs of other terminals (for example, the second QoS flow of the second session of the second terminal, the third QoS flow of the third session of the second terminal, the second DRB of the second terminal, the second QoS flow of the second terminal's The third DRB) has the same meaning, which will not be described in detail below.

In this application, the first QoS flow of the first session of the first terminal may be represented by at least one of the following methods:

The combination of UE-1 ID+PSI-1+QFI-1;

Combination of PSI-1+QFI-1;

Three separate fields for UE-1 ID, PSI-1, and QFI-1; or,

PSI-1 and QFI-1 are two separate fields.

The "+" here means to connect together, for example, UE-1 ID is 123, PSI-1 is 456, QFI-1 is 789, then UE-1 ID+PSI-1+QFI-1 is 123456789, or UE ID123PSI 456QFI 789.

Wherein, UE-1 ID is the identification of the first terminal, PSI-1 is the identification of the first session, and QFI-1 is the identification of the first QoS flow.

In this application, the first DRB of the first terminal may be represented by at least one of the following methods:

A combination of UE-1 ID+DRB-1; or,

UE-1 ID and DRB-1 are two separate fields.

Wherein, UE-1 ID is the identifier of the first terminal, and DRB-1 is the identifier of the first DRB.

It should be noted that the sessions and QoS flows of other terminals in this application (for example, the second QoS flow of the second session of the second terminal, the third QoS flow of the third session of the second terminal) can also use the same representation method, which will not be repeated below. Similarly, DRBs of other terminals in this application (for example, the second DRB of the second terminal, and the third DRB of the second terminal) may also be represented by the same representation method, which will not be described in detail below.

Step 202, the first terminal sends second information to the second terminal.

Correspondingly, the second terminal receives the second information from the first terminal.

Wherein, the second information is used to request to transfer the media to the second terminal.

In a possible implementation manner, the first terminal needs to perform a discovery process of the second terminal before sending the second message to the second terminal, for example, the second terminal broadcasts a discovery (discovery) message, and after the first terminal receives the discovery message Reply, so that the first terminal can discover the second terminal; or, the first terminal broadcasts a request message, and the second terminal replies after receiving the request message, so that the first terminal can discover the second terminal.

Optionally, the second information may carry an identifier of the media transferred from the first terminal to the second terminal, for example, APP ID.

Step 203, the second terminal sends third information to the first terminal.

Correspondingly, the first terminal receives the third information from the second terminal.

Wherein, the third information includes at least one of the following information: the identifier of the cell where the second terminal is located, the identifier of the second terminal, and the identifier of the second session allocated by the second terminal. The second session is used for the second terminal to transmit data of the first media. The identity of the cell where the second terminal is located can be understood as the identity of the cell where the second terminal is currently camping (Camp on), such as NR cell global identifier (NR cell global identifier, NCGI), NR physical layer cell ID (physical cell ID, PCI )wait.

Optionally, the identifier of the second session allocated by the second terminal is encrypted. For example, the identifier of the second session allocated by the second terminal may be encrypted using an encryption key between the first access network device and the second terminal, for example, using packet data convergence protocol (packet data convergence protocol, PDCP) layer encryption The key is encrypted.

In a possible implementation manner, after receiving the second information from the first terminal, the second terminal may determine whether to support or agree to transfer the media from the first terminal to the second terminal. For example, the second terminal may check whether an application corresponding to the media is installed in the second terminal, and if the corresponding application is installed, the second terminal supports or agrees that the first terminal transfers the media to the second terminal; or, the second terminal The terminal can maintain the running state of the current service of the second terminal. For example, when the second terminal is currently conducting a voice call, video call or real-time game, the second terminal refuses the first terminal to transfer the media to the second terminal.

Step 204, the first terminal sends the first information to the first access network device.

Correspondingly, the first access network device receives the first information from the first terminal.

Wherein, the first information is used to request to transfer the first media to the second terminal. The first information may include an identifier of the second terminal, an identifier of the first session of the first terminal, and an identifier of the first QoS flow of the first session.

Optionally, if the third information in step 203 includes the identifier of the second session assigned by the second terminal, the first information may also include the identifier of the second session.

Optionally, if the second information in step 202 does not carry the identifier of the first medium, the first information may also include the identifier of the first medium, so that the first access network device can send it to the second terminal later.

In a possible implementation, if the third information in step 203 carries the identity of the cell where the second terminal is located, the first terminal may also determine whether the first terminal and the second terminal are camped on according to the identity of the cell where the second terminal is located. stay in the same neighborhood. When the first terminal determines that the first terminal and the second terminal reside in the same cell or the same access network device, the first terminal sends the first information to the first access network device. When the first terminal determines that the first terminal and the second terminal reside in different cells or different access network devices, the first terminal does not send the first information. The identifier of the cell where the terminal is located may be understood as the identifier of the cell where the terminal resides.

This application does not specifically limit the manner in which the first terminal sends the first information to the first access network device. In a possible implementation manner, the first terminal may directly send the first information to the first access network device. In another possible implementation manner, the first terminal may send the first information to the first access network device through the first AMF that provides services for the first terminal.

Step 205, the first access network device generates a third correspondence in the context of the first terminal according to the first information, and/or generates a fourth correspondence in the context of the second terminal.

Wherein, the third correspondence includes a correspondence between the first QoS flow of the first session of the first terminal and the second DRB of the second terminal. The fourth correspondence includes a correspondence between the second DRB of the second terminal and the first QoS flow of the first session of the first terminal.

In some possible implementation manners, before step 205, steps 206-207 may also be performed.

Step 206, the first access network device sends fifth information to the second terminal.

Correspondingly, the second terminal receives fifth information from the first access network device.

Wherein, the fifth information is used to ask whether to agree to transfer the first media to the second terminal.

Step 207, the second terminal sends sixth information to the first access network device.

Correspondingly, the first access network device receives sixth information from the second terminal.

Wherein, the sixth information is used to indicate agreement to transfer the first media to the second terminal.

In addition, if the second terminal does not support or agree to transfer the first media from the first terminal to the second terminal, the second terminal may send rejection information to the first access network device.

Optionally, if the second information in step 202 does not carry the identifier of the second session assigned by the second terminal, the sixth information may carry the identifier of the second session. Optionally, the identifier of the second session is encrypted.

It should be noted that if the first terminal sends the first information to the first access network device through the first AMF, the first AMF may also send the fifth information to the second terminal through the second AMF serving the second terminal. information, and the second terminal sends sixth information to the first AMF through the second AMF.

Step 208, the first access network device acquires the eighth information.

Wherein, the eighth information includes the context information of the first session and the context information of the first QoS flow. Wherein, the context information of the first session includes at least one of the following: IP address, DNN, S-NSSAI, SSC mode, and session AMBR. The context information of the first QoS flow includes at least one of the following: QoS parameters such as 5QI, GFBR, and MFBR.

In a possible implementation manner, the first access network device acquires the eighth information from the first SMF that provides services for the first terminal. For example, the first access network device may obtain the eighth information from the first SMF through the first AMF.

In another possible implementation manner, the first access network device acquires the locally stored eighth information. The eighth information may be sent by the first SMF to the first access network device when the first QoS flow of the first session is established for the first terminal.

It should be noted that the present application does not limit the order of steps 205 and 208 .

Step 209, the first access network device sends fourth information to the second terminal.

Correspondingly, the second terminal receives fourth information from the first access network device.

Wherein, the fourth information includes: the identifier of the second session, the identifier of the second QoS flow, the context information of the first session, and the context information of the first QoS flow. The context information of the first session is used by the second terminal to determine the context of the second session. The context information of the first QoS flow is used by the second terminal to determine the context of the second QoS flow. The identifier of the second session here may be assigned by the second terminal, or may be pre-configured in the first access network device, for example, a fixed value is used for the identifier of the second session in the first access network device , for example, 0. The identifier of the second QoS flow may be allocated by the first access network device or preconfigured in the first access network device.

Optionally, if the first information in step 204 carries the identifier of the first media, the fourth information may further include the identifier of the first media.

Optionally, the fourth information may also include context information of the second DRB, so as to configure the second DRB for the second terminal.

Step 210, the second terminal determines the context information of the second session and the context information of the second QoS flow according to the fourth information, and generates a first corresponding relationship.

Wherein, the first correspondence includes a correspondence between the second QoS flow of the second session of the second terminal and the second DRB of the second terminal.

In a possible implementation manner, the second terminal determines the context information of the second session according to the context information of the first session, and determines the context information of the second QoS flow according to the context information of the first QoS flow. As an example, the context information of the second session is the same as the context information of the first session, and/or the context information of the second QoS flow is the same as the context information of the first QoS flow.

In steps 201-210, the configuration process of transferring the first media from the first terminal to the second terminal is completed.

After the configuration process is completed, the transmission of the downlink data of the first medium may be as shown in steps 211-212.

Step 211, the first access network device receives the first downlink data of the first media through the first QoS flow of the first session of the first terminal.

Step 212, the first access network device sends the first downlink data to the second terminal through the second DRB of the second terminal according to the third correspondence in the context of the first terminal. For the third corresponding relationship, reference may be made to step 205, which will not be repeated here.

After completing the configuration process, the uplink data of the first medium may be as shown in steps 213-216.

Step 213, the second terminal acquires the first uplink data of the first medium.

Step 214, the second terminal determines to send the first uplink data through the second QoS flow of the second session according to the context information of the second QoS flow of the second session.

Step 215, the second terminal sends the first uplink data to the first access network device through the second DRB of the second terminal according to the first correspondence. For the first corresponding relationship, reference may be made to step 210, which will not be repeated here.

Step 216, the first access network device sends the first uplink data through the first QoS flow of the first session of the first terminal according to the fourth correspondence in the context of the second terminal. For the fourth corresponding relationship, reference may be made to step 205, which will not be repeated here.

In the above technical solution, when the first media is transferred from the first terminal to the second terminal, the data transmission channel between the access network device and the terminal can be changed with the first access network device as the anchor point, that is, the AS The data transmission channel to the first access network device remains unchanged, and the data transmission between the access network device and the terminal is converted from the first access network device to the first terminal to the first access network device to the second The terminal implements the transfer of the first media from the first terminal to the second terminal. In addition, in this technical solution, the first terminal can exit or maintain the method for data transmission of the first media, and ensure that the data transmission of the first media is not interrupted, which helps to improve user experience.

For the above scenario 2, the present application proposes the methods shown in FIG. 3 and FIG. 4 .

FIG. 3 is a schematic diagram of a method 300 for transmitting data provided by an embodiment of the present application. Method 300 may include at least some of the following.

Step 301, the second terminal determines a third session and a third QoS flow according to the context information of the second session and the context information of the second QoS flow.

In a possible implementation manner, the second terminal determines whether the third session and the third QoS flow have been established on the second terminal according to the second terminal's context information of the second session and the context information of the second QoS flow. If the third session and/or the third QoS flow is not established on the second terminal, the second terminal may establish the third session and/or the third QoS flow according to the context information of the second session and/or the context information of the second QoS flow flow.

Optionally, the context information of the third session is the same as the context information of the second session, and the context information of the third QoS flow is the same as the context information of the second QoS flow.

Step 302, the second terminal generates a tenth corresponding relationship.

Wherein, the tenth correspondence includes the correspondence between the first QoS flow of the first session of the first terminal, the third QoS flow of the third session of the second terminal, and the second DRB of the second terminal.

Step 303, the second terminal sends seventh information to the first access network device.

Correspondingly, the first access network device receives the seventh information sent by the second terminal.

Wherein, the seventh information is used to indicate that the second DRB of the second terminal corresponds to the third QoS flow of the third session of the second terminal.

Step 304, the first access network device generates an eleventh corresponding relationship according to the seventh information.

Wherein, the eleventh correspondence includes a correspondence between the second DRB of the second terminal and the third QoS flow of the third session of the second terminal.

Step 305, the first access network device determines to switch the second terminal to the second access network device.

To put it another way of description, the first access network device determines that the second terminal leaves the coverage of the first access network device and enters the coverage of the second access network device.

In a possible implementation manner, the first access network device determines to handover the second terminal to the second access network device according to the measurement report from the second terminal.

It should be noted that step 305 is an optional step. FIG. 8 takes step 305 as an example.

Step 306, the first access network device sends tenth information to the first UPF that provides services for the first terminal.

Correspondingly, the first UPF receives the tenth information from the first access network device.

Wherein, the tenth information is used to request to modify the IP address of the data corresponding to the first QoS flow of the first session of the first terminal to the IP address of the third session.

In a possible implementation manner, the first access network device sends the tenth information to the second AMF that provides services for the second terminal. The second AMF sends the received tenth information to the first AMF. The first AMF sends the received tenth information to the first SMF. The first SMF sends the received tenth information to the first UPF. It should be noted that if the tenth information to be received by the second AMF does not carry the IP address of the third session, the second AMF may obtain the IP address of the third session from the second SMF providing services for the second terminal, and It is sent to the first UPF along with the tenth information.

Step 307, the first UPF modifies the IP address of the data of the first QoS flow in the first session of the first terminal to the IP address of the third session.

Step 308, the first access network device sends the eleventh information to the second terminal.

Correspondingly, the second terminal receives the eleventh information from the first access network device.

Wherein, the eleventh information is used to indicate to delete the second session and the second QoS flow.

Step 309, the second terminal generates a second correspondence according to the eleventh information, and deletes the second session and the second QoS flow.

Wherein, the second correspondence includes a correspondence between the third DRB of the second terminal and the third QoS flow of the third session of the second terminal. The deletion of the second session and the second QoS flow here may be understood as deleting the context information of the second session and the context information of the second QoS flow.

It should be noted that, in the case of executing step 305, steps 306 to 309 can be implemented by the steps in the process of switching the second terminal to the second access network device. For specific description, please refer to FIG. 10 below. Operations of the second access network device when the second terminal switches to the second access network device are not shown in FIG. 8 .

After steps 301-309, the transmission of the downlink data of the first medium may be as shown in steps 310-311.

Step 310, the second access network device receives the second downlink data of the first media through the third QoS flow of the third session of the second terminal.

Wherein, the second terminal is handed over from the first access network device to the second access network device.

Step 311, the second access network device sends second downlink data to the second terminal through the third DRB of the second terminal according to the fifth correspondence in the context of the second terminal.

Wherein, the fifth correspondence includes a correspondence between the third DRB of the second terminal and the third QoS flow of the third session of the second terminal. Wherein, the third DRB is the DRB configured by the second access network device for the second terminal when the second terminal switches from the first access network device to the second access network device, and the third DRB can be used to transmit the Data of the third QoS flow of the third session.

After steps 301-309, the uplink data of the first medium may be as shown in steps 312-315.

Step 312, the second terminal acquires second uplink data of the first medium.

Step 313, the second terminal determines to send the second uplink data through the third QoS flow of the third session according to the context information of the third QoS flow of the third session.

Step 314, the second terminal sends the second uplink data to the second access network device through the third DRB of the second terminal according to the second correspondence. For the second correspondence, reference may be made to step 309 , which will not be repeated here.

Step 315, the second access network device sends the second uplink data through the third QoS flow of the third session of the second terminal according to the fifth correspondence in the context of the second terminal.

It should be noted that, if step 305 is not performed, the second access network device in steps 310-315 above can be replaced by the first access network device, and the third DRB is the first access network device and the second The DRB configured by the terminal, the third DRB may be used to transmit the data of the third QoS flow of the third session of the second terminal.

FIG. 4 is a schematic diagram of a method 400 for transmitting data provided by an embodiment of the present application. Method 400 may include at least some of the following.

Step 401, the first access network device determines to switch the second terminal to the second access network device.

Step 402, the first access network device sends the thirteenth information to the second access network device according to the fourth correspondence.

Correspondingly, the second access network device receives the thirteenth information from the first access network device.

Wherein, the fourth correspondence includes the correspondence between the second DRB of the second terminal, the second QoS of the second session of the second terminal, and the first QoS flow of the first session of the first terminal.

Wherein, the thirteenth information includes the first indication information, the context information of the second DRB of the second terminal, and the first configuration information. Wherein, the first indication information is used to indicate to establish the first forwarding tunnel for the second DRB of the second terminal. The first configuration information is configuration information of the first access network device for the first forwarding tunnel.

In a possible implementation manner, the first access network device sends the thirteenth information to the second access network device through a handover request.

Step 403, the second access network device generates an eighth corresponding relationship according to the thirteenth information.

Wherein, the eighth correspondence includes a correspondence between the first forwarding tunnel and the third DRB of the second terminal.

Step 404, the second access network device sends fourteenth information to the first access network device.

Correspondingly, the first access network device receives fourteenth information from the second access network device.

Wherein, the fourteenth information includes the context information of the third DRB and the second configuration information. Wherein, the context information of the third DRB is used by the first access network device to configure the third DRB for the second terminal. The context information of the third DRB is determined according to the context information of the second DRB, for example, the context information of the third DRB is the same as the context information of the second DRB. The second configuration information is configuration information of the second access network device for the first forwarding tunnel.

Step 405, the first access network device generates a sixth correspondence in the context of the first terminal.

Wherein, the sixth correspondence includes the correspondence between the first QoS flow of the first session and the first forwarding tunnel.

Step 406, the first access network device sends fifteenth information to the second terminal.

Correspondingly, the second terminal receives fifteenth information from the first access network device.

Wherein, the fifteenth information includes the context information of the third DRB, the identifier of the second session, and the identifier of the second QoS flow.

Step 407, the second terminal generates a twelfth correspondence according to the fifteenth information.

Wherein, the twelfth correspondence includes a correspondence between the third DRB of the second terminal and the second QoS flow of the second session of the second terminal.

After steps 401-407, the downlink data of the first medium may be as shown in steps 408-410.

Step 408, the first access network device receives the third downlink data of the first media through the first QoS flow of the first session of the first terminal.

Step 409, the first access network device sends the third downlink data to the second access network device through the first forwarding tunnel according to the sixth correspondence. The sixth correspondence includes the correspondence between the first QoS flow of the first session and the first forwarding tunnel.

Step 410, the second access network device sends third downlink data to the second terminal through the third DRB of the second terminal according to the eighth correspondence.

After steps 401-407, the uplink data of the first medium may be as shown in steps 411-415.

Step 411, the second terminal acquires third uplink data of the first medium.

Step 412, the second terminal determines to send the third uplink data through the second QoS flow of the second session according to the context information of the second QoS flow of the second session.

In a possible implementation manner, the second terminal determines to send the third uplink data through the second QoS flow of the second session according to the QoS rule in the context information of the second QoS flow of the second session.

Step 413, the second terminal sends third uplink data to the second access network device through the third DRB of the second terminal according to the twelfth correspondence. The twelfth correspondence includes a correspondence between the third DRB of the second terminal and the second QoS flow of the second session of the second terminal.

Step 414, the second access network device sends the third uplink data to the first access network device through the first forwarding tunnel according to the eighth correspondence.

Step 415, the first access network device sends the third uplink data through the first QoS flow of the first session of the first terminal according to the sixth correspondence.

It should be noted that, for the step of switching the second terminal to the second access network device not shown in detail in FIG. 4 , reference may be made to the prior art, and details are not repeated here.

For the above scenario 3, the present application proposes the methods shown in FIG. 5 and FIG. 6 .

FIG. 5 is a schematic diagram of a method 500 for transmitting data provided by an embodiment of the present application. Method 500 may include at least some of the following.

Step 501, the second terminal determines a third session and a third QoS flow according to the context information of the second session and the context information of the second QoS flow.

Step 502, the second terminal generates a tenth corresponding relationship.

Step 503, the second terminal sends seventh information to the first access network device.

Step 504, the first access network device generates an eleventh corresponding relationship according to the seventh information.

Steps 501-504 are the same as steps 301-304 in FIG. 3 , for a more detailed description, reference may be made to steps 301-304 , which will not be repeated here.

Step 505, the first access network device determines to switch the first terminal to the second access network device.

In another description, the first access network device determines that the first terminal leaves the coverage of the first access network device and enters the coverage of the third access network device.

In a possible implementation manner, the first access network device determines to handover the first terminal to the second access network device according to the measurement report from the first terminal.

Step 506, the first access network device sends tenth information to the first UPF that provides services for the first terminal.

Step 507, the first UPF modifies the IP address of the data of the first QoS flow in the first session of the first terminal to the IP address of the third session.

Step 508, the first access network device sends the eleventh information to the second terminal.

Steps 506-508 are the same as steps 306-308 in FIG. 3 , for a more detailed description, reference may be made to steps 306-308 , which will not be repeated here.

Step 509, the second terminal generates a thirteenth correspondence according to the eleventh information, and deletes the second session and the second QoS flow.

Wherein, the thirteenth correspondence includes a correspondence between the second DRB of the second terminal and the third QoS flow of the third session of the second terminal.

After steps 501-509, the transmission of the downlink data of the first medium may be as shown in steps 510-511.

Step 510, the first access network device receives fifth downlink data of the first media through the third QoS flow of the third session of the second terminal.

Step 511 , the first access network device sends fifth downlink data to the second terminal through the second DRB of the second terminal according to the eleventh correspondence in the context of the second terminal.

After steps 501-509, the uplink data of the first medium may be as shown in steps 512-515.

Step 512, the second terminal acquires fifth uplink data of the first medium.

Step 513, the second terminal determines to send fifth uplink data through the third QoS flow of the third session according to the context information of the third QoS flow of the third session.

In a possible implementation manner, the second terminal determines to send the fifth uplink data through the third QoS flow of the third session according to the QoS rule in the context information of the third QoS flow of the third session.

Step 514, the second terminal sends fifth uplink data to the first access network device through the second DRB of the second terminal according to the thirteenth correspondence. Wherein, the thirteenth correspondence includes a correspondence between the second DRB of the second terminal and the third QoS flow of the third session of the second terminal.

Step 515, the first access network device sends fifth uplink data through the third QoS flow of the third session of the second terminal according to the eleventh correspondence in the context of the second terminal.

It should also be noted that if the first access network device configures a new third DRB for the second terminal to transmit the data of the third QoS flow of the third session, the first access network device also generates the fifteenth Corresponding relationship, the second terminal further generates a sixteenth corresponding relationship, where the fifteenth corresponding relationship includes a corresponding relationship between the third DRB of the second terminal and the third QoS flow of the third session of the second terminal. The sixteenth correspondence includes the correspondence between the third DRB of the second terminal and the third QoS flow of the third session of the second terminal. In this way, in step 511, the first access network device sends the fifth downlink data to the second terminal through the third DRB of the second terminal according to the fifteenth correspondence in the context of the second terminal; According to the sixteenth corresponding relationship, the second terminal sends the fifth uplink data to the first access network device through the third DRB of the second terminal; in step 515, the first access network device Fifteen correspondences, the fifth uplink data is sent through the third QoS flow of the third session of the second terminal.

FIG. 6 is a schematic diagram of a method 600 for transmitting data provided by an embodiment of the present application. Method 600 may include at least some of the following.

Step 601, the first access network device determines to switch the first terminal to the second access network device.

Step 602, the first access network device sends sixteenth information to the third access network device according to the fourth correspondence.

Correspondingly, the third access network device receives the sixteenth information from the first access network device.

Wherein, the fourth correspondence includes a correspondence between the second DRB of the first terminal, the second QoS of the second session of the second terminal, and the first QoS flow of the first session of the first terminal.

Wherein, the sixteenth information includes third indication information and third configuration information. Wherein, the third indication information is used to indicate to establish the second forwarding tunnel for the first QoS flow of the first session of the first terminal. The third configuration information is configuration information of the first access network device for the second forwarding tunnel.

In a possible implementation manner, the first access network device sends the sixteenth information to the third access network device through a handover request.

Step 603, the third access network device generates a ninth corresponding relationship according to the sixteenth information.

Wherein, the ninth correspondence includes a correspondence between the second forwarding tunnel and the first QoS flow of the first session of the first terminal.

Step 604, the third access network device sends fourth configuration information to the first access network device.

Correspondingly, the first access network device receives fourth configuration information from the third access network device.

Wherein, the fourth configuration information is configuration information of the third access network device for the first forwarding tunnel.

Step 605, the first access network device generates a seventh correspondence in the context of the second terminal.

Wherein, the seventh correspondence includes the correspondence between the second DRB of the second terminal and the second forwarding tunnel.

After steps 601-605, the downlink data of the first medium may be as shown in steps 606-608.

Step 606, the third access network device receives fourth downlink data of the first media through the first QoS flow of the first session of the first terminal.

Step 607, the third access network device sends fourth downlink data to the first access network device through the second forwarding tunnel according to the ninth correspondence. The ninth correspondence includes the correspondence between the first QoS flow of the first session and the second forwarding tunnel.

Step 608, the first access network device sends fourth downlink data to the second terminal through the second DRB of the second terminal according to the seventh correspondence.

After steps 601-605, the uplink data of the first medium may be as shown in steps 609-613.

Step 609, the second terminal acquires fourth uplink data of the first medium.

Step 610, the second terminal determines to send fourth uplink data through the second QoS flow of the second session according to the context information of the second QoS flow of the second session.

In a possible implementation manner, the second terminal determines to send the fourth uplink data through the second QoS flow of the second session according to the QoS rule in the context information of the second QoS flow of the second session.

Step 611, the second terminal sends fourth uplink data to the first access network device through the second DRB of the second terminal according to the first correspondence. The first correspondence includes a correspondence between the second DRB of the second terminal and the second QoS flow of the second session of the second terminal.

Step 612, the first access network device sends fourth uplink data to the third access network device through the second forwarding tunnel according to the seventh correspondence.

Step 613, the third access network device sends fourth uplink data through the first QoS flow of the first session of the first terminal according to the ninth correspondence.

It should be noted that, for the step of switching the first terminal to the third access network device not shown in detail in FIG. 6 , reference may be made to the prior art, and details are not repeated here.

The technical solution of the present application will be described exemplarily below with reference to FIG. 7 to FIG. 19 . In FIG. 7 to FIG. 19 , AMF-1, SMF-1, and UPF-1 are core network entities providing services for UE1, and AMF-2 and SMF-2 are core network entities providing services for UE2. Wherein, AMF-1 and AMF-2 may be the same or different; SMF-1 and SMF-2 may be the same or different. In Figure 7 to Figure 19, UE1, UE2, base station-A, base station-B, base station-C, AMF-1, SMF-1, UPF-1, AMF-2, SMF-2 respectively correspond to the above A terminal, a second terminal, a first access network device, a second access network device, a third access network device, a first AMF, a first SMF, a first UPF, a second AMF, and a second SMF.

Example 1

The method shown in Example 1 can be applied to Scenario 1 described above. For scenario 1, FIG. 7 shows a change of a transmission path of media data of UE-1 after applying the technical solution of the present application. Wherein, AS-1 is the server of the application being used on UE-1, and AS-2 is the server of the application being used on UE-2.

As shown in FIG. 7 , the transmission path of the media data of UE-1 is changed from path 1 to path 2 .

Path 1: UE-1 and UE-2 transmit their respective media data, UE-1 communicates with AS-1 through base station-A, UPF-1, UE-2 communicates with AS-1 through base station-A, UPF-1 2 to communicate.

Path 2: For the media data of UE-1, with base station-A as the anchor point, the data transmission channel from AS-1 to base station-A remains unchanged, and the data transmission channel from base station-A to UE-1 is changed to the base station -A to UE-2. After the change, AS-1 transmits the media data of UE-1 to base station-A through the data transmission channel of UE-1, and base station-A transmits the received media data of UE-1 through the data transmission channel of UE-2 Transmitted to UE-2.

For Scenario 1, the present application provides the data transmission method shown in FIG. 8 .

Step 801, UE-1 sends a first request message to UE-2.

Correspondingly, UE-2 receives the first request message from UE-1.

The first request message may correspond to the second information described above.

Wherein, the first request message is used to request to transfer the media of UE-1 to UE-2. The first request message carries an application (application, APP) identifier (identity, ID) corresponding to the media.

Step 802, UE-2 sends a first response message to UE-1.

Correspondingly, UE-1 receives the first response message from UE-2.

The first response message may correspond to the above-mentioned third information.

Wherein, the first response message includes the identifier of UE-2, the identifier of the cell where UE-2 is located, and the PSI-2 allocated by UE-2.

Wherein, the identifier of UE-2 is information that can uniquely determine UE-2, for example, the identifier of UE-2 may be 5G-GUTI, TMSI, C-RNTI, etc. The identifier of the cell where UE-2 is located is information that can uniquely determine the cell where UE-2 is located, for example, the identifier of the cell where UE-2 is located may be NCGI or PCI. PSI-2 is the identification of the PDU session of UE-2 used to transmit the media data transferred from UE-1 to UE-2. Optionally, UE-2 can encrypt PSI-2, for example, UE-2 can use The encryption key between the base station and UE-2 encrypts PSI-2.

Step 803, UE-1 sends a second request message to base station-A.

Correspondingly, base station-A receives the second request message from UE-1.

The second request message may correspond to the first information described above.

Wherein, the second request message is used to request to transfer the media of UE-1 to UE-2. The second request message includes the identifier of UE-2, the PSI-2 allocated by UE-2, and the information of the QoS flow (QoS flow) corresponding to the media. The information of the QoS flow corresponding to the media may include PSI-1, QFI-1, and the QoS rule (QoS rule) corresponding to the media, where PSI-1 is the identification of the PDU session used to transmit the data of the media of UE-1 , QFI-1 is the identifier of the QoS flow used to transmit the media data of UE-1.

Optionally, the second request message is a radio resource control (radio resource control, RRC) message.

Optionally, if UE-2 encrypts PSI-2, base station-A may decrypt PSI-2, and verify the legitimacy of UE-1 transferring the media to UE-2.

Step 804, base station-A sends a third request message to AMF-1.

Correspondingly, AMF-1 receives the third request message from base station-A.

Wherein, the third request message is used to request media-related information. The third request message includes PSI-1 and QFI-1.

Step 805, AMF-1 sends a fourth request message to SMF-1.

Correspondingly, SMF-1 receives the fourth request message from AMF-1.

Wherein, the fourth request message is used for requesting media-related information. The fourth request message includes PSI-1 and QFI-1.

Step 806, SMF-1 sends a fourth response message to AMF-1 according to the fourth request message.

Correspondingly, AMF-1 receives the fourth response message from SMF-1.

Wherein, the fourth response message includes media-related information. The media-related information includes information corresponding to PSI-1 and information corresponding to QFI-1. The information corresponding to PSI-1 includes at least one of the following information: IP address, DNN, S-NSSAI, SSC mode, and session AMBR. The information corresponding to QFI-1 includes at least one of the following information: QoS parameters such as 5QI, GFBR, and MFBR.

Step 807, AMF-1 sends a third response message to base station-A.

Correspondingly, a third response message from AMF-1 is received.

Wherein, the base station-A third response message includes information corresponding to PSI-1 and information corresponding to QFI-1. The information corresponding to PSI-1 includes at least one of the following information: IP address, DNN, S-NSSAI, SSC mode, and session AMBR. The information corresponding to QFI-1 includes at least one of the following information: QoS parameters such as 5QI, GFBR, and MFBR.

Step 808, base station-A sends a first configuration message to UE-2.

Correspondingly, UE-2 receives the first configuration message from base station-A.

Wherein, the first configuration message is used to configure DRB-2 for UE-2, and DRB-2 is used to transmit media data transferred from UE-1 to UE-2. The first configuration message carries fourth information, and the fourth information includes at least one of the following information: PSI-2, information corresponding to PSI-1, QFI-2, information corresponding to QFI-1, and QoS rules corresponding to media. Wherein, QFI-2 is an identifier of a QoS flow of UE-2 used for transmitting media data transferred from UE-1 to UE-2. In a possible implementation manner, the PSI-2 and QFI-2 are carried in the SDAP header of the first configuration message.

Optionally, QFI-2 is the same as QFI-1.

Step 809, base station-A updates the context of UE-1 and the context of UE-2.

Specifically, base station-A records the third correspondence in the context of UE-1, and records the fourth correspondence in the context of UE-2. Among them, the third correspondence is

The fourth correspondence is

It should be noted that the present application does not limit the order of steps 808 and 809 .

Step 810, UE-2 generates QoS flow parameters corresponding to DRB-2 according to the first configuration message.

Wherein, the QoS flow parameters corresponding to DRB-2 include information corresponding to PSI-2 and information corresponding to QFI-2. The information corresponding to PSI-2 includes at least one of the following information: IP address, DNN, S-NSSAI, SSC mode, and session AMBR, etc., where the IP address is the IP address of UE-1. The information corresponding to the QFI-2 includes at least one of the following information: QoS parameters such as 5QI, GFBR, MFBR, and QoS rules, where the QoS rule is a QoS rule corresponding to the media.

Optionally, UE-2 may save the first correspondence:

Subsequently, for the uplink, when the media transferred from UE-1 to UE-2 generates data, UE-2 can use the IP address of PSI-2 as the source IP address of the IP packet, and use the QoS rules corresponding to the media to transfer the media The generated data is mapped to QFI-2 and sent to base station-A through DRB-2; base station-A sends the received data to UPF-1 through PSI-1 and QFI-1 according to the fourth correspondence, and then by UPF-1 sends to AS-1. For the downlink, after base station-A receives data through PSI-1 and QFI-1, base station-A sends the received data to UE-2 through DRB-2 according to the third correspondence.

In addition, it should be noted that the first response message in step 802 and the second request message in step 803 may not carry the PSI-2 allocated by UE-2. An alternative solution is that base station-A may use the preset PSI (for example, 0). In other words, UE-2 may not allocate PSI-2.

It should also be noted that the first request message in step 801 may not carry the application identifier corresponding to the media. An alternative solution is that UE-1 sends the application identifier to base station-A, and then base station-A sends it to UE -2, for example, UE-1 may send the application identifier to base station-A through the second request message in step 803, and base station-A may send the application identifier to UE-2 through the first configuration message in step 808.

It should also be noted that the base station-A may not obtain media-related information from the core network, that is, steps 804-807 may not be performed. An alternative solution is that the base station-A obtains and sends the media information according to the QoS profile (QoS profile). Media-related information, wherein the QoS configuration file may be sent by SMF-1 to base station-A when establishing a QoS flow for UE-1.

In the above technical solution, base station-A can obtain a virtual PSI-2, and configure DRB-2 for UE-2 according to PSI-2. , the parameters of the PDU session corresponding to PSI-1, and the parameters of the QoS flow corresponding to QFI-1 are sent to UE-2, and UE-2 can construct a virtual PDU session (PSI-2) and QoS flow according to the received information (QFI-2), the virtual PDU session uses the IP address of PSI-1, and the virtual QoS flow is based on the QoS rule corresponding to the media. In this way, the media of UE-1 can be transferred to UE-2, and it can be ensured that the transmission of media data is not interrupted. For UE-1, UE-1 can completely quit the transmission of media data.

Example 2

For scenario 1, the present application also provides the method for transmitting data shown in FIG. 9 .

Step 901, UE-1 sends a first request message to UE-2.

Correspondingly, UE-2 receives the first request message from UE-1.

Wherein, the first request message is used to request to transfer the media of UE-1 to UE-2. The first request message carries an application identifier corresponding to the medium.

Step 902, UE-2 sends a first response message to UE-1.

Correspondingly, UE-1 receives the first response message from UE-2.

Wherein, the identifier of UE-2 is information that can uniquely determine UE-2, for example, the identifier of UE-2 may be 5G-GUTI, TMSI, C-RNTI, etc. The identifier of the cell where UE-2 is located is information that can uniquely determine the cell where UE-2 is located, for example, the identifier of the cell where UE-2 is located may be NCGI. PSI-2 is the identification of the PDU session of UE-2 used to transmit the media data transferred from UE-1 to UE-2. Optionally, UE-2 can encrypt PSI-2, for example, UE-2 can use The encryption key between the base station and UE-2 encrypts PSI-2.

Step 903, UE-1 sends a fifth request message to AMF-1.

Correspondingly, AMF-1 receives the fifth request message from UE-1.

Wherein, the fifth request message is used to request to transfer the media of UE-1 to UE-2. The fifth request message includes the identifier of UE-2, the PSI-2 allocated by UE-2, and the information of the QoS flow corresponding to the media. The information of the QoS flow corresponding to the media may include PSI-1, QFI-1, and QoS rules corresponding to the media, where PSI-1 is the identifier of the PDU session used to transmit the data of the media of UE-1, and QFI-1 It is the identifier of the QoS flow used to transmit the media data of UE-1.

Optionally, the fifth request message is a NAS message.

Step 904, AMF-1 sends a fourth request message to SMF-1.

Correspondingly, SMF-1 receives the fourth request message from AMF-1.

Wherein, the fourth request message is used for requesting media-related information. The media-related information may include the second information above. The fourth request message includes PSI-1 and QFI-1.

Step 905, SMF-1 sends a fourth response message to AMF-1 according to the fourth request message.

Correspondingly, AMF-1 receives the fourth response message from SMF-1.

Step 906, AMF-1 sends a sixth request message to base station-A.

Accordingly, a sixth request message from AMF-1 is received.

Wherein, the sixth request message is used to request to transfer the media of UE-1 to UE-2. The sixth request message includes the identifier of UE-2, PSI-2, information corresponding to PSI-1, and information corresponding to QFI-1. The information corresponding to PSI-1 includes at least one of the following information: IP address, DNN, S-NSSAI, SSC mode, and session AMBR. The information corresponding to QFI-1 includes at least one of the following information: QoS parameters such as 5QI, GFBR, and MFBR.

Step 907, base station-A sends a first configuration message to UE-2.

Wherein, the first configuration message is used to configure DRB-2 for UE-2, and DRB-2 is used to transmit media data transferred from UE-1 to UE-2. The first configuration message includes fourth information, and the fourth information includes at least one of the following information: information corresponding to PSI-2 and PSI-1, information corresponding to QFI-2 and QFI-1, and QoS rules corresponding to media. Wherein, QFI-2 is an identifier of a QoS flow of UE-2 used for transmitting media data transferred from UE-1 to UE-2. In a possible implementation manner, the PSI-2 and QFI-2 are carried in the SDAP header of the first configuration message.

Optionally, QFI-2 is the same as QFI-1.

Step 908, base station-A updates the context of UE-1 and the context of UE-2.

The fourth correspondence is

It should be noted that the present application does not limit the sequence of steps 907 and 908 .

Step 909, UE-2 generates QoS flow parameters corresponding to DRB-2 according to the first configuration message.

Optionally, UE-2 may save the first correspondence:

In addition, it should be noted that the first response message in step 902, the fifth request message in step 903, and the sixth request message in step 906 may not carry the PSI-2 allocated by UE-2, an alternative solution A preset PSI (eg, 0) may be used for base station-A. In other words, UE-2 may not allocate PSI-2.

It should also be noted that the first request message in step 901 may not carry the application identifier corresponding to the media. An alternative solution is that UE-1 sends the application identifier to AMF-1, and AMF-1 sends it to base station- A, then sent by base station-A to UE-2, for example, UE-1 can send the application identification to AMF-1 through the fifth request message in step 903, and AMF-1 can send the application identification to AMF-1 through the sixth request message in step 906 The message sends the application identifier to base station-A, and base station-A may send the application identifier to UE-2 through the first configuration message in step 907 .

It should also be noted that base station-A may not obtain media-related information from the core network. An alternative solution is that base station-A obtains and sends media-related information according to a QoS profile (QoS profile), wherein the QoS configuration The file may be sent by SMF-1 to base station-A when establishing a QoS flow for UE-1.

Example 3

For scenario 1, the present application also provides the method for transmitting data shown in FIG. 10 .

Step 1001, UE-1 sends a first request message to UE-2.

Correspondingly, UE-2 receives the first request message from UE-1.

Step 1002, UE-2 sends a first response message to UE-1.

Correspondingly, UE-1 receives the first response message from UE-2.

Wherein, the first response message includes the identity of UE-2 and the identity of the cell where UE-2 is located. For a detailed description of the identity of UE-2 and the identity of the cell where UE-2 is located, reference may be made to FIG. 8 , which will not be repeated here.

Step 1003, UE-1 sends a second request message to base station-A.

Correspondingly, base station-A receives the second request message from UE-1.

Wherein, the second request message is used to request to transfer the media of UE-1 to UE-2. The second request message includes the identifier of UE-2 and the information of the QoS flow corresponding to the media. For a detailed description of the information of the QoS flow corresponding to the media, reference may be made to FIG. 8 , which will not be repeated here.

Optionally, the second request message is an RRC message.

Step 1004, base station-A sends a seventh request message to UE-2 according to the identifier of UE-2 in the second request message.

Correspondingly, UE-2 receives the seventh request message from base station-A.

Wherein, the seventh request message is used to inquire whether UE-2 agrees to transfer the media of UE-1 to UE-2. The seventh request message carries the identifier of UE-1.

Step 1005, UE-2 determines whether to agree to transfer the media of UE-1 to UE-2.

If UE-2 agrees to transfer the media of UE-1 to UE-2, UE-2 may allocate PSI-2, and execute step 1006. Wherein, PSI-2 is the identification of the PDU session of UE-2 used to transmit the data of the media transferred from UE-1 to UE-2. Optionally, UE-2 may encrypt PSI-2, for example, UE-2 PSI-2 may be encrypted using an encryption key between the base station and UE-2.

Step 1006, UE-2 sends a seventh response message to base station-A.

Correspondingly, base station-A receives the seventh response message from UE-2.

Wherein, the seventh response message is used to instruct UE-2 to agree to transfer the media of UE-1 to UE-2. The seventh response message carries the PSI-2 allocated by UE-2.

Step 1007, base station-A sends a third request message to AMF-1.

Correspondingly, AMF-1 receives the third request message from base station-A.

Step 1008, AMF-1 sends a fourth request message to SMF-1.

Correspondingly, SMF-1 receives the fourth request message from AMF-1.

Step 1009, SMF-1 sends a fourth response message to AMF-1 according to the fourth request message.

Correspondingly, AMF-1 receives the fourth response message from SMF-1.

Step 1010, AMF-1 sends a third response message to base station-A.

Correspondingly, a third response message from AMF-1 is received.

Step 1011, base station-A sends a first configuration message to UE-2.

Step 1012, base station-A updates the context of UE-1 and the context of UE-2.

Step 1013, UE-2 generates QoS flow parameters corresponding to DRB-2 according to the first configuration message.

Subsequently, AS-1 may transmit the media generated data transferred from UE-1 to UE-2 to UE-2.

Steps 1007-1013 are the same as steps 804-810, and reference may be made to the description of steps 804-810, which will not be repeated here.

In addition, it should be noted that the seventh response message in step 1006 may not carry the PSI-2 allocated by UE-2. An alternative solution is the first response message in step 1002 and the second response message in step 1003. The request message carries the PSI-2 allocated by UE-2, and another alternative solution is that base station-A can use a preset PSI (for example, 0).

It should also be noted that the first request message in step 1001 may not carry the application identifier corresponding to the media. An alternative solution is that UE-1 sends the application identifier to base station-A, and then base station-A sends it to UE -2, for example, UE-1 may send the application identifier to base station-A through the second request message in step 1003, and base station-A may send the application identifier to UE-2 through the first configuration message in step 1011.

It should also be noted that base station-A may not obtain media-related information from the core network, that is, steps 1007-1010 may not be performed. An alternative solution is that base station-A obtains and transmits media information according to a QoS profile (QoS profile). Media-related information, wherein the QoS configuration file may be sent by SMF-1 to base station-A when establishing a QoS flow for UE-1.

In the above technical solution, base station-A can obtain a virtual PSI-2, and configure DRB-2 for UE-2 according to PSI-2. , PDU session parameters corresponding to PSI-1, and QoS flow parameters corresponding to QFI-1 are sent to UE-2, and UE-2 can construct a virtual PDU session (PSI-2) and QoS flow according to the received information (QFI-2), the virtual PDU session uses the IP address of PSI-1, and the QoS flow is based on the QoS rule corresponding to the media. In this way, the media of UE-1 can be transferred to UE-2, and it can be ensured that the transmission of media data is not interrupted. For UE-1, UE-1 can completely quit the transmission of media data.

In addition, in the above technical solution, base station-A inquires whether UE-2 agrees to transfer UE-1's media to UE-2, which helps to avoid the impact of UE-1's misoperation on UE-2, thereby Make the media transfer process more accurate.

Example 4

For Scenario 1, the present application also provides the data transmission method shown in FIG. 11 .

Step 1101, UE-1 sends a first request message to UE-2.

Correspondingly, UE-2 receives the first request message from UE-1.

Step 1102, UE-2 sends a first response message to UE-1.

Correspondingly, UE-1 receives the first response message from UE-2.

Step 1103, UE-1 sends a fifth request message to AMF-1.

Correspondingly, AMF-1 receives the fifth request message from UE-1.

Wherein, the fifth request message is used to request to transfer the media of UE-1 to UE-2. The fifth request message includes the identifier of UE-2 and information about the QoS flow corresponding to the media. For a detailed description of the information of the QoS flow corresponding to the media, reference may be made to FIG. 8 , which will not be repeated here.

Optionally, the fifth request message is a NAS message.

Step 1104, AMF-1 sends an eighth request message to AMF-2 according to the identifier of UE-2 in the fifth request message.

Correspondingly, AMF-2 receives the eighth request message from AMF-1.

Wherein, the eighth request message is used to inquire whether UE-2 agrees to transfer the media of UE-1 to UE-2. The eighth request message carries the identity of UE-1 and the identity of UE-2.

Step 1105, AMF-2 sends a ninth request message to UE-2 according to the identifier of UE-2 in the eighth request message.

Correspondingly, UE-2 receives the ninth request message from AMF-2.

Wherein, the ninth request message is used to inquire whether UE-2 agrees to transfer the media of UE-1 to UE-2. The ninth request message carries the identifier of UE-1.

Step 1106, UE-2 determines whether to agree to transfer the media of UE-1 to UE-2.

If UE-2 agrees to transfer the media of UE-1 to UE-2, UE-2 may allocate PSI-2, and perform step 1107. Wherein, PSI-2 is the identification of the PDU session of UE-2 used to transmit the data of the media transferred from UE-1 to UE-2. Optionally, UE-2 may encrypt PSI-2, for example, UE-2 PSI-2 may be encrypted using an encryption key between the base station and UE-2.

Step 1107, UE-2 sends a ninth response message to AMF-2.

Correspondingly, AMF-2 receives the ninth response message from UE-2.

Wherein, the ninth response message is used to indicate that UE-2 agrees to transfer the media of UE-1 to UE-2. The ninth response message carries the PSI-2 allocated by UE-2.

Step 1108, AMF-2 sends an eighth response message to AMF-1.

Correspondingly, AMF-1 receives the eighth response message from AMF-2.

Wherein, the eighth response message is used to indicate that UE-2 agrees to transfer the media of UE-1 to UE-2. The eighth response message carries the PSI-2 allocated by UE-2.

Step 1109, AMF-1 sends a fourth request message to SMF-1.

Correspondingly, SMF-1 receives the fourth request message from AMF-1.

Step 1110, SMF-1 sends a fourth response message to AMF-1 according to the fourth request message.

Correspondingly, AMF-1 receives the fourth response message from SMF-1.

Step 1111, AMF-1 sends a sixth request message to base station-A.

Accordingly, a sixth request message from AMF-1 is received.

Step 1112, base station-A sends a first configuration message to UE-2.

Step 1113, base station-A updates the context of UE-1 and the context of UE-2.

Step 1114, UE-2 generates QoS flow parameters corresponding to DRB-2 according to the first configuration message.

Steps 1109-1114 are the same as steps 904-909, and reference may be made to the description of steps 904-909, which will not be repeated here.

In addition, it should be noted that the ninth response message in step 1107 and the eighth response message in step 1108 may not carry the PSI-2 allocated by UE-2. An alternative solution is that the PSI-2 in step 1102 A response message, the fifth request message in step 1103, and the sixth request message in step 1111 carry the PSI-2 allocated by UE-2. Another alternative is that base station-A can use a preset PSI (for example, 0 ).

It should also be noted that the first request message in step 1101 may not carry the application identifier corresponding to the media. An alternative solution is that UE-1 sends the application identifier to AMF-1, and AMF-1 sends it to base station- A, then sent by base station-A to UE-2, for example, UE-1 can send the application identification to AMF-1 through the fifth request message in step 1103, and AMF-1 can send the application identification to AMF-1 through the sixth request message in step 1111 The message sends the application identifier to base station-A, and base station-A may send the application identifier to UE-2 through the first configuration message in step 1112 .

In addition, in the above technical solution, AMF-2 asks whether UE-2 agrees to transfer UE-1's media to UE-2, which helps to avoid the impact of UE-1's misoperation on UE-2, thereby Make the media transfer process more accurate.

Example 5

The method shown in Example 5 can be applied to Scenario 2 described above. For scenario 2, FIG. 12 shows a change of the transmission path of the media data of UE-1 after applying the technical solution of the present application. Wherein, AS-1 is the server of the application being used on UE-1, AS-2 is the server of the application being used on UE-2; UPF-1 is a UPF providing services for UE-1 and UE-2.

When UE-2 has a large movement range and leaves the coverage of base station-A and enters the coverage of base station-B, the transmission path of the media data of UE-1 is changed from path 2 to path 3.

Path 2: Refer to FIG. 7 , and details will not be repeated here.

Path 3: For the media data of UE-1, the data transmission channel between UPF-1 of UE-1 and base station-A is changed to the data transmission channel between UPF-1 of UE-2 and base station-B. After the change, AS-1 transmits the media data of UE-1 to UPF-1, and UPF-1 transmits the media data of UE-1 to base station-B through the data transmission channel of UE-2, and base station-B will receive The media data of UE-1 is transmitted to UE-2 through the data transmission channel of UE-2.

For scenario 2, the present application provides the method for transmitting data shown in FIG. 13 .

Before executing the method shown in Figure 13, UE-2 generates information corresponding to PSI-2 and information corresponding to QFI-2, and saves the first correspondence:

Base station-A records the third correspondence in the context of UE-1:

A fourth correspondence is recorded in the context of UE-2:

It should be noted that the various pieces of information and corresponding relationships here may be obtained through any of the methods shown in FIG. 8-FIG. 8 .

Step 1301, UE-2 determines whether there is a PDU session PSI-3 corresponding to PSI-2 and whether there is a QoS flow QFI-3 corresponding to QFI-2 according to the information corresponding to PSI-2 and the information corresponding to QFI-2 .

In other words, UE-2 determines whether there is a real PDU session PSI-3 or QoS flow QFI corresponding to the virtual PDU session PSI-2 and QoS flow QFI-2 according to the information corresponding to PSI-2 and the information corresponding to QFI-2 -3.

If UE-2 determines that there is no session PSI-3 corresponding to PSI-2 and/or QoS flow QFI-3 corresponding to QFI-2, UE-2 performs step 1302 .

If UE-2 determines that there is a session PSI-3 corresponding to PSI-2 and/or a QoS flow QFI-3 corresponding to QFI-2, then UE-2 executes step 1303, that is, skips step 1302.

In step 1302, UE-2 initiates the establishment process of PDU session PSI-3 and/or the establishment process of QoS flow QFI-3.

Wherein, UE-2 establishes PDU session PSI-3 and/or QoS flow QFI-3 according to the information corresponding to PSI-2 and the information corresponding to QFI-2. In other words, the information corresponding to PSI-3 is the same as the information corresponding to PSI-2, and the information corresponding to QFI-3 is the same as the information corresponding to QFI-2.

Step 1303, UE-2 generates a tenth corresponding relationship.

Among them, the tenth corresponding relationship is:

In a possible implementation manner, UE-2 may obtain the tenth correspondence by updating the first correspondence.

Step 1304, UE-2 reports seventh information to base station-A.

Wherein, the seventh information is used to indicate that DBR-2 corresponds to PSI-3 and QFI-3 of UE-2.

In a possible implementation manner, UE-2 transmits the seventh information through an uplink transport.

Step 1305, base station-A generates an eleventh corresponding relationship according to the seventh information.

Among them, the eleventh corresponding relationship is:

In a possible implementation manner, the base station-A may update the fourth correspondence according to the seventh information, and the updated fourth correspondence is the eleventh correspondence.

Step 1306, UE-2 reports a measurement report (measurement report) according to the configuration of base station-A.

In step 1307, the base station-A determines the process of initiating a handover of the base station according to the measurement report sent by the UE-2.

Step 1308, base station-A generates a first handover message according to the eleventh correspondence.

Wherein, the first handover message includes the seventh information, PSI-3, the identifier of UE-1, PSI-1, and QFI-1 (or the QoS rule corresponding to the medium).

A possible implementation, the first handover message is handover required, the Source to Target transparent container (Source to Target transparent container) field contains the seventh information, and the PDU session IDs (PDU session IDs) field contains PSI-3, the first The handover message additionally carries the identity of UE-1, PSI-1, and QFI-1 (or QoS rules corresponding to the media).

Step 1309, base station-A sends a first handover message to AMF-2.

Correspondingly, AMF-2 receives the first handover message from base station-A.

Step 1310, AMF-2 sends a tenth request message to AMF-1 according to the identifier of UE-1 in the first handover message.

Correspondingly, AMF-1 receives the tenth request message from AMF-2.

Wherein, the tenth request message is used to request to modify the IP address of the data corresponding to QFI-1 of PSI-1 to the IP address corresponding to PSI-3. The tenth request message includes the identifier of UE-1, PSI-1, and QFI-1 (or the QoS rule corresponding to the media), and the IP address corresponding to QFI-3 of UE-2.

Wherein, the IP address corresponding to the QFI-3 of the UE-2 may be the IP address of the UE-2 or the IP address of the QFI-3 of the UE-2. The IP address corresponding to QFI-3 of UE-2 may be acquired by AMF-2 from SMF-2.

Step 1311, AMF-1 sends an eleventh request message to SMF-1.

Correspondingly, SMF-1 receives the eleventh request message from AMF-1.

Wherein, the eleventh request message is used to request to modify the IP address of the data corresponding to the QFI-1 of PSI-1 to the IP address corresponding to PSI-3. The eleventh request message includes the identifier of UE-1, PSI-1, and QFI-1 (or the QoS rule corresponding to the media), and the IP address corresponding to PSI-3.

Step 1312, SMF-1 sends a twelfth request message to UPF-1.

Correspondingly, UPF-1 receives the twelfth request message from SMF-1.

Wherein, the twelfth request message is used to request to change the IP address of the data corresponding to QFI-1 of PSI-1 to the IP address corresponding to PSI-3. The twelfth request message includes the identifier of UE-1, PSI-1, and QFI-1 (or the QoS rule corresponding to the media), and the IP address corresponding to PSI-3.

Step 1313, UPF-1 modifies the IP address of the data corresponding to QFI-1 of PSI-1 to the IP address corresponding to PSI-3 according to the twelfth request message. Wherein, the data corresponding to the QFI-1 of the PSI-1 may be the data of the QFI-1 of the PSI-1 or the data conforming to the QoS rule corresponding to the media.

Step 1314, UE-2, base station-A, base station-B, AMF-1, AMF-2, SMF-1, SMF-2 complete subsequent handover procedures.

In the above subsequent handover procedure, base station-B may record the fifth correspondence in the context of UE-2. The fifth corresponding relationship is:

Step 1315, UE-2 deletes the PDU session corresponding to PSI-2 and the QoS flow corresponding to QFI-2, and generates a second corresponding relationship.

Among them, the second corresponding relationship is:

In a possible implementation manner, UE-2 may obtain the second correspondence by updating the tenth correspondence.

Subsequently, for the uplink, when the media transferred from UE-1 to UE-2 generates data, UE-2 can use the IP address of PSI-3 as the source IP address of the IP packet, and use the QoS rules corresponding to the media to transfer the media The generated data is mapped to QFI-3 and sent to base station-B through DRB-3; base station-B sends the received data to UPF-1 through PSI-3 and QFI-3 according to the fifth correspondence, and then sent by UPF-1 sends to AS-1. For the downlink, after base station-B receives data through PSI-3 and QFI-3, base station-B sends the received data to UE-2 through DRB-3 according to the fifth correspondence.

Through the above technical solution, after the media of UE-1 is transferred to UE-2, when UE-2 leaves the coverage of base station-A, services can be guaranteed without interruption, which helps to improve user experience.

Example 6

The method shown in Example 6 can be applied to Scenario 2 described above. For scenario 2, FIG. 14 shows another change of the transmission path of the media data of UE-1 after applying the technical solution of the present application. Wherein, AS-1 is the server of the application being used on UE-1, and AS-2 is the server of the application being used on UE-2.

When UE-2 has a large movement range and leaves the coverage of base station-A and enters the coverage of base station-B, the transmission path of the media data of UE-1 is changed from path 2 to path 4.

Path 2: Refer to FIG. 7 , and details will not be repeated here.

Path 3: For the media data of UE-1, the data transmission channel from AS-1 to base station-A remains unchanged. After the media data of UE-1 is transmitted to base station-A, base station-A communicates with base station-A through base station-A. The data transmission channel between base stations-B transmits the media data of UE-1 to base station-B. After the change, AS-1 transmits the media data of UE-1 to base station-A, base station-A transmits the media data of UE-1 to base station-B, and base station-B transmits the received media data of UE-1 The data is transmitted to UE-2 through the data transmission channel of UE-2.

For scenario 2, the present application also provides the data transmission method shown in FIG. 15 .

Before executing the method shown in Figure 15, UE-2 generates information corresponding to PSI-2 and information corresponding to QFI-2, and saves the first correspondence:

Base station-A records the third correspondence in the context of UE-1:

A fourth correspondence is recorded in the context of UE-2:

It should be noted that the various pieces of information and corresponding relationships here may be obtained through any of the methods shown in FIG. 8 to FIG. 11 .

Step 1501, UE-2 reports a measurement report according to the configuration of base station-A.

Step 1502, base station-A determines the procedure of initiating a handover of base stations according to the measurement report sent by UE-2.

Step 1503, base station-A generates a second handover message according to the fourth correspondence.

Wherein, the second handover message includes the first indication information, the second indication information, the context information of the DRB-2, and the configuration information of the forwarding tunnel for the PSI-2 of the base station-A. Wherein, the first indication information is used to indicate to establish a forwarding tunnel for PSI-2. The second indication information is used to indicate that DBR-2 corresponds to PSI-2 and QFI-2. For ease of distinction, the forwarding tunnel involved here is referred to as forwarding tunnel-1 hereinafter.

In a possible implementation manner, the second handover message is a handover request.

Step 1504, base station-A sends a second handover message to base station-B.

Correspondingly, base station-B receives the second handover message from base station-A.

Step 1505, base station-B generates an eighth correspondence.

Among them, the eighth corresponding relationship is: forwarding tunnel

Step 1506, base station-B sends a second handover response message to base station-A.

Correspondingly, base station-A receives the second handover response message from base station-B.

Wherein, the second handover response message includes configuration information of DRB-3, information indicating handover success, and configuration information of base station-B for forwarding tunnel-1.

In a possible implementation manner, the second handover response message is handover request acknowledge.

Step 1507, base station-A generates a sixth correspondence in the context of UE-1.

Among them, the sixth correspondence is

In a possible implementation manner, the base station-A obtains the sixth correspondence by updating the third correspondence.

Step 1508, UE-2, base station-A, base station-B, AMF-1, AMF-2, SMF-1, SMF-2, and UPF-1 complete subsequent handover procedures.

Step 1509, UE-2 generates a twelfth correspondence.

Among them, the twelfth corresponding relationship is:

Subsequently, for the uplink, when the media transferred from UE-1 to UE-2 generates data, UE-2 can use the IP address of PSI-2 as the source IP address of the IP packet, and use the QoS rules corresponding to the media to transfer the media The generated data is mapped to QFI-2 and sent to base station-B through DRB-3; base station-B sends the received data to base station-A through forwarding tunnel-1 according to the eighth correspondence, and base station-A according to the eighth correspondence Six correspondences Send data to UPF-1 through PSI-1 and QFI-1, and then send data to AS-1 by UPF-1. For the downlink, when base station-A receives data through PSI-1 and QFI-1, base station-A sends the received data to base station-B through forwarding tunnel-1 according to the sixth correspondence, and base station-B Send the received data to UE-2 through DRB-3 according to the eighth correspondence.

It should be noted that, if there is a communication interface between the base station-A and the base station-B, the base station-A and the base station-B can communicate through the interface. If there is no communication interface between base station-A and base station-B, base station-A and base station-B can communicate through AMF. Taking the second handover message as an example, base station-A can send the second handover message to AMF-1 , sent by AMF-1 to AMF-2, and then sent to base station-B by AMF-2.

Example 7

The method shown in Example 7 can be applied to Scenario 3 described above. For scenario 3, FIG. 16 shows a change of the transmission path of media data of UE-1 after applying the technical solution of the present application. Wherein, AS-1 is the server of the application being used on UE-1, and AS-2 is the server of the application being used on UE-2.

When UE-1 has a large movement range and leaves the coverage of base station-A and enters the coverage of base station-C, the transmission path of the media data of UE-1 is changed from path 2 to path 5.

Path 2: Refer to FIG. 7 , and details will not be repeated here.

Path 5: For the media data of UE-1, the data transmission channel between UPF-1 of UE-1 and base station-A is changed to the data transmission channel between UPF-1 of UE-2 and base station-A. After the change, AS-1 transmits the media data of UE-1 to UPF-1, and UPF-1 transmits the media data of UE-1 to base station-A through the data transmission channel of UE-2, and base station-A will receive The media data of UE-1 is transmitted to UE-2 through the data transmission channel of UE-2.

For scenario 3, the present application provides the data transmission method shown in FIG. 17 .

Before executing the method shown in Figure 17, UE-2 generates information corresponding to PSI-2 and information corresponding to QFI-2, and saves the first correspondence:

Base station-A records the third correspondence in the context of UE-1:

A fourth correspondence is recorded in the context of UE-2:

It should be noted that the various information and corresponding relationships here may be obtained through any of the methods shown in FIG. 8 and FIG. 11 .

Step 1701, UE-2 determines whether there is a PDU session PSI-3 corresponding to PSI-2 and whether there is a QoS flow QFI-3 corresponding to QFI-2 according to the information corresponding to PSI-2 and the information corresponding to QFI-2 .

In step 1702, UE-2 initiates the establishment process of PDU session PSI-3 and/or the establishment process of QoS flow QFI-3.

Step 1703, UE-2 generates a tenth corresponding relationship.

Step 1704, UE-2 reports seventh information to base station-A.

Step 1705, base station-A generates an eleventh corresponding relationship according to the seventh information.

Steps 1701-1705 are the same as steps 1301-1305, and reference may be made to the description of steps 1301-1305, which will not be repeated here.

Step 1706, UE-1 reports a measurement report according to the configuration of base station-A.

Step 1707, base station-A determines the procedure of initiating a handover of base stations according to the measurement report sent by UE-1.

Step 1708, base station-A generates a thirteenth request message according to the eleventh correspondence.

Wherein, the thirteenth request message is used to request to modify the IP address of the data corresponding to the QFI-1 of PSI-1 to the IP address corresponding to PSI-3. The thirteenth request message includes PSI-3, the identifier of UE-1, PSI-1, and QFI-1 (or the QoS rule corresponding to the medium).

Step 1709, base station-A sends a thirteenth request message to AMF-2.

Correspondingly, AMF-2 receives the thirteenth request message from base station-A.

Step 1710, AMF-2 sends a fourteenth request message to SMF-2.

Correspondingly, SMF-2 receives the fourteenth request message from AMF-1.

Wherein, the fourteenth request message is used for requesting activation of PSI-3 and requesting the IP address corresponding to PSI-3.

In a possible implementation manner, the fourteenth request message is Nsmf_PDUSession_UpdataSMContext Request.

Step 1711, SMF-2 activates PSI-3, and sends a fourteenth response message to AMF-2.

Correspondingly, AMF-2 receives the fourteenth response message from SMF-2.

Wherein, the fourteenth response message includes the IP address corresponding to PSI-3.

In a possible implementation manner, the fourteenth response message is Nsmf_PDUSession_UpdataSMContext Response.

Step 1712, AMF-2 sends a fifteenth request message to AMF-1 according to the identifier of UE-1 in the thirteenth request message.

Correspondingly, AMF-1 receives the fifteenth request message from AMF-2.

Wherein, the fifteenth request message is used to request to change the IP address of the data corresponding to QFI-1 of PSI-1 to the IP address corresponding to PSI-3. The fifteenth request message includes the identifier of UE-1, PSI-1, QFI-1 (or the QoS rule corresponding to the media), and the IP address corresponding to PSI-3.

Step 1713, AMF-1 sends a sixteenth request message to SMF-1.

Correspondingly, SMF-1 receives the sixteenth request message from AMF-1.

Wherein, the sixteenth request message is used to request to modify the IP address of the data corresponding to the QFI-1 of PSI-1 to the IP address corresponding to PSI-3. The sixteenth request message includes the identifier of UE-1, PSI-1, and QFI-1 (or the QoS rule corresponding to the media), and the IP address corresponding to PSI-3.

Step 1714, SMF-1 sends a seventeenth request message to UPF-1.

Correspondingly, UPF-1 receives the seventeenth request message from SMF-1.

Wherein, the seventeenth request message is used to request to change the IP address of the data corresponding to QFI-1 of PSI-1 to the IP address corresponding to PSI-3. The seventeenth request message includes the identifier of UE-1, PSI-1, and QFI-1 (or the QoS rule corresponding to the media), and the IP address corresponding to PSI-3.

Step 1715, UPF-1 modifies the IP address of the data corresponding to QFI-1 of PSI-1 to the IP address corresponding to PSI-3 according to the seventeenth request message. Wherein, the data corresponding to the QFI-1 of the PSI-1 may be the data of the QFI-1 of the PSI-1 or the data conforming to the QoS rule corresponding to the media.

Step 1716, the second AMF sends a thirteenth response message to base station-A.

Correspondingly, base station-A receives the thirteenth response message from the second AMF.

Wherein, the thirteenth response message includes relevant information of PSI-3.

Step 1717, base station-A sends a second configuration message to UE-2 according to the relevant information of PSI-3 and the context information of DRB-2.

Correspondingly, UE-2 receives the second configuration message from base station-A.

Wherein, the second configuration message is used to configure DRB-3.

In a possible implementation manner, the second configuration message is an RRC connection reconfiguration message (RRC connection reconfiguration).

Base station-A may record the fifteenth correspondence in the context of UE-2. The fifteenth corresponding relationship is:

Step 1718, UE-2 deletes the PDU session corresponding to PSI-2 and the QoS flow corresponding to QFI-2, and generates a sixteenth corresponding relationship.

Among them, the sixteenth corresponding relationship is:

In a possible implementation manner, UE-2 may obtain the sixteenth correspondence by updating the tenth correspondence.

Step 1719, UE-1, base station-A, base station-B, AMF-1, AMF-2, SMF-1, SMF-2 complete the subsequent handover procedure.

Subsequently, for the uplink, when the media transferred from UE-1 to UE-2 generates data, UE-2 can use the IP address of PSI-3 as the source IP address of the IP packet, and use the QoS rules corresponding to the media to transfer the media The generated data is mapped to QFI-3 and sent to base station-A through DRB-3; base station-A sends the received data to UPF-1 through PSI-3 and QFI-3 according to the fifteenth corresponding relationship, and then Sent by UPF-1 to AS-1. For the downlink, after base station-A receives data through PSI-3 and QFI-3, base station-A sends the received data to UE-2 through DRB-3 according to the fifteenth correspondence.

Through the above technical solution, after the media of UE-1 is transferred to UE-2, when UE-1 leaves the coverage of base station-A, services can be guaranteed without interruption, which helps to improve user experience.

Example 8

The method shown in Example 8 can be applied to Scenario 3 described above. For scenario 3, FIG. 18 shows another change of the transmission path of the media data of UE-1 after applying the technical solution of the present application. Wherein, AS-1 is the server of the application being used on UE-1, and AS-2 is the server of the application being used on UE-2.

When UE-1 has a large movement range and leaves the coverage of base station-A and enters the coverage of base station-B, the transmission path of the media data of UE-1 is changed from path 2 to path 5.

Path 2: Refer to FIG. 7 , and details will not be repeated here.

Path 3: AS-1 transmits the media data of UE-1 to base station-C, base station-C transmits the media data of UE-1 to base station-A, and base station-A transmits the received media data of UE-1 The data is transmitted to UE-2 through the data transmission channel of UE-2.

For scenario 3, the present application also provides the data transmission method shown in FIG. 19 .

Before executing the method shown in Figure 19, UE-2 generates information corresponding to PSI-2 and information corresponding to QFI-2, and saves the first correspondence:

Base station-A records the third correspondence in the context of UE-1:

A fourth correspondence is recorded in the context of UE-2:

Step 1901, UE-1 reports a measurement report according to the configuration of base station-A.

In step 1902, base station-A determines a process of initiating a handover of base stations according to the measurement report sent by UE-1.

Step 1903, base station-A generates a third handover message according to the fourth correspondence.

Wherein, the third handover message includes third indication information and configuration information of the forwarding tunnel of the base station-A for the QFI-1 of the PSI-1. Wherein, the third indication information is used to indicate to establish a forwarding tunnel for QFI-1 of PSI-1. For ease of distinction, the forwarding tunnel involved here is referred to as forwarding tunnel-2 hereinafter.

In a possible implementation manner, the third handover message is a handover request.

Step 1904, base station-A sends a third handover message to base station-C.

Correspondingly, base station-C receives the third handover message from base station-A.

Step 1905, base station-C generates a ninth correspondence.

Among them, the ninth corresponding relationship is: forwarding tunnel

Step 1906, base station-C sends a third handover response message to base station-A.

Correspondingly, base station-A receives the third handover response message from base station-C.

Wherein, the third handover response message includes configuration information of base station-C for forwarding tunnel-2.

In a possible implementation manner, the third handover response message is handover request acknowledge.

Step 1907, base station-A generates a seventh correspondence in the context of UE-2.

Among them, the seventh corresponding relationship is: forwarding tunnel

In a possible implementation manner, the base station-A obtains the seventh correspondence by updating the fourth correspondence.

Step 1908, UE-1, base station-A, base station-B, AMF-1, AMF-2, SMF-1, SMF-2, UPF-1 complete the subsequent handover procedure.

Subsequently, for the uplink, when the media transferred from UE-1 to UE-2 generates data, UE-2 can use the IP address of PSI-2 as the source IP address of the IP packet, and use the QoS rules corresponding to the media to transfer the media The generated data is mapped to QFI-2 and sent to base station-A through DRB-2; base station-A sends the received data to base station-C through forwarding tunnel-2 according to the seventh correspondence, and base station-C transmits the received data to base station-C according to the seventh correspondence Nine Correspondences The data is sent to UPF-1 through PSI-1 and QFI-1, and then sent to AS-1 by UPF-1. For the downlink, when base station-C receives data through PSI-1 and QFI-1, base station-C sends the received data to base station-A through forwarding tunnel-2 according to the ninth correspondence, and base station-A Send the received data to UE-2 through DRB-2 according to the seventh correspondence.

It should be noted that, if there is a communication interface between the base station-A and the base station-C, the base station-A and the base station-C may communicate through the interface. If there is no communication interface between base station-A and base station-C, base station-A and base station-C can communicate through AMF, taking the third handover message as an example, base station-A can send the third handover message to AMF-1 , sent by AMF-1 to AMF-2, and then sent to base station-C by AMF-2.

The method provided by this application is described in detail above with reference to Figure 2 to Figure 19, and the device embodiment of this application will be described in detail below in conjunction with Figure 20 to Figure 21. It can be understood that, in order to implement the functions in the foregoing embodiments, the apparatus in FIG. 20 or FIG. 21 includes corresponding hardware structures and/or software modules for performing various functions. Those skilled in the art should easily realize that the present application can be implemented in the form of hardware or a combination of hardware and computer software with reference to the units and method steps of the examples described in the embodiments disclosed in the present application. Whether a certain function is executed by hardware or computer software drives the hardware depends on the specific application scenario and design constraints of the technical solution.

FIG. 20 and FIG. 21 are schematic structural diagrams of possible devices provided by the embodiments of the present application. These devices can be used to implement the functions of the first terminal, the second terminal, the first access network device, the second access network device, the third access network device, the first AMF, or the second AMF in the above method embodiments , so the beneficial effects possessed by the above method embodiments can also be realized.

As shown in FIG. 20 , the device 2000 includes a transceiver unit 2010 and a processing unit 2020 .

When the apparatus 2000 is used to implement the functions of the first terminal in the foregoing method embodiments, the processing unit 2020 is used to: determine to transfer the first media to the second terminal. The transceiver unit 2010 is configured to: the first access network device sends first information, the first information is used to request to transfer the first medium to the second terminal, and the first information includes the second terminal The identifier of the first session of the first terminal, and the identifier of the first quality of service QoS flow of the first session, the first session and the first QoS flow are used for the transmission of the first terminal data of the first medium.

Optionally, the transceiver unit 2010 is further configured to: send second information to the second terminal, where the second information is used to request media transfer to the second terminal; and receive a third message from the second terminal information, the third information includes at least one of the following information: the identity of the cell where the second terminal is located, the identity of the second terminal, and the identity of the second session allocated by the second terminal, the The second session is used for the second terminal to transmit the data of the first media.

Optionally, the identifier of the second session is encrypted.

Optionally, when the third information includes the identifier of the second session, the first information further includes the identifier of the second session.

Optionally, when the third information includes the identity of the cell where the second terminal is located, the processing unit 2020 is further configured to: determine that the second terminal is located in the second terminal according to the identity of the cell where the second terminal is located. within the coverage of an access network device.

Optionally, the second information further includes an identifier of the first medium.

Optionally, the first information further includes an identifier of the first medium.

Optionally, the transceiving unit 2010 is specifically configured to: send the first information to the first access network device through a first access and mobility management function AMF that provides services for the first terminal.

When the device 2000 is used to implement the functions of the second terminal in the above method embodiment, the processing unit 2020 is used to: acquire the first uplink data of the first medium, the first medium is transferred from the first terminal to the second terminal media of the terminal; and according to the context information of the second QoS flow of the second session, determine to send the first uplink data through the second QoS flow of the second session. The transceiver unit 2010 is configured to: send the first uplink data to the first access network device through the second data radio bearer DRB according to the first correspondence, wherein the first correspondence includes all The corresponding relationship between the second QoS flow and the second DRB, the context information of the second session is determined according to the context information of the first session of the first terminal, and the context information of the second QoS flow is Determined according to the context information of the first QoS flow of the first session, the first session and the first QoS flow are used by the first terminal to transmit the data of the first media.

Optionally, the transceiver unit 2010 is further configured to: acquire fourth information from the first access network device, where the fourth information includes: an identifier of the second session, an identifier of the second QoS flow, the first Context information of a session, and context information of the first QoS flow. The processing unit 2020 is further configured to: determine the context information of the second session and the context information of the second QoS flow according to the fourth information, and generate the first correspondence.

Optionally, the transceiver unit 2010 is further configured to: receive second information from the first terminal, where the second information is used to request transfer of media to the second terminal; and send a third message to the first terminal. information, the third information includes at least one of the following information: an identifier of the cell where the second terminal is located, an identifier of the second terminal, and an identifier of the second session.

Optionally, the fourth information further includes at least one of the following information: context information of the second DRB, and an identifier of the first medium.

Optionally, the transceiver unit 2010 is further configured to: receive fifth information, where the fifth information is used to inquire whether to agree to transfer the first medium to the second terminal; and send sixth information, where the sixth The information is used to indicate agreement to transfer the first media to the second terminal.

Optionally, the transceiving unit 2010 is specifically configured to: receive the fifth information from the first access network device; or, receive the fifth information from the first access and mobility management function AMF that provides services for the first terminal The fifth message.

Optionally, the sixth information further includes an identifier of the second session.

Optionally, the identifier of the second session is encrypted.

Optionally, when the second terminal enters the coverage of the second access network device from the coverage of the first access network device, or the first terminal is covered by the first access network device When the range enters the coverage of the third access network device, the processing unit 2020 is further configured to: acquire the second uplink data of the first media; and determine according to the context information of the third QoS flow of the third session through the The third QoS flow of the third session sends the second uplink data. The transceiver unit 2010 is further configured to: send the second uplink data to the first access network device through a third DRB according to the second correspondence, wherein the second correspondence includes all The corresponding relationship between the third QoS flow and the third DRB, wherein the context information of the third session is determined according to the context information of the first session, and the context information of the third QoS flow is determined according to the The context information of the first QoS flow is determined according to the context information of the first QoS flow, and the context information of the third DRB is determined according to the context information of the second DRB.

Optionally, the processing unit 2020 is further configured to: determine the context information of the third session according to the context information of the second session, and/or, the second terminal determines the context information of the second QoS flow according to the context information of the second QoS flow The third QoS flow context information, and/or, the second terminal determines the third DRB context information according to the second DRB context information; and generates the second correspondence.

Optionally, the second terminal determines the third session context information according to the context information of the second session, and/or, the second terminal determines the third session context information according to the context information of the second QoS flow. Third QoS flow context information, and/or, before the second terminal determines the third DRB context information according to the second DRB context information, the processing unit 2020 is further configured to: determine that the third session does not exist And/or the third QoS flow and/or the third DRB.

Optionally, the transceiver unit 2010 is further configured to: send seventh information to the first access network device, where the seventh information is used to indicate that the second DRB corresponds to the third DRB of the second terminal. Said third QoS flow for the session.

When the apparatus 2000 is used to implement the functions of the first access network device in the above method embodiment, the transceiver unit 2010 is used to: receive the first download of the first media through the first quality of service QoS stream of the first session of the first terminal row data, the first medium is the medium transferred from the first terminal to the second terminal; and according to the third corresponding relationship, the second data radio bearer DRB of the second terminal is sent to the second terminal The first downlink data, wherein the third correspondence includes a correspondence between the first QoS flow of the first session of the first terminal and the second DRB of the second terminal .

Optionally, the transceiver unit 2010 is further configured to: receive the first uplink data of the first medium sent by the second terminal through the second DRB; and according to the fourth correspondence, through the first terminal's The first QoS flow of the first session sends the first uplink data, wherein the fourth correspondence includes the second DRB of the second terminal and the first DRB of the first terminal The corresponding relationship of the first QoS flow of a session.

Optionally, the transceiver unit 2010 is further configured to: receive first information from the first terminal, the first information is used to request to transfer the first medium to the second terminal, and the first information It includes the identifier of the second terminal, the identifier of the first session, and the identifier of the first QoS flow. The processing unit 2020 is configured to: generate the third correspondence in the context of the first terminal according to the first information, and/or generate the fourth correspondence in the context of the second terminal .

Optionally, the transceiving unit 2010 is specifically configured to: receive the first information through the first AMF that provides services for the first terminal.

Optionally, the transceiving unit 2010 is further configured to: acquire eighth information, where the eighth information includes context information of the first session and context information of the first QoS flow; and send the eighth information to the second terminal. Four information, the fourth information includes: the identifier of the second session, the identifier of the second QoS flow, the context information of the first session, and the context information of the first QoS flow, wherein the second session The second QoS flow is used by the second terminal to transmit the data of the first media, the context information of the first session is used by the second terminal to determine the context of the second session, and the first The context information of the QoS flow is used by the second terminal to determine the context of the second QoS flow.

Optionally, the transceiving unit 2010 is specifically configured to: obtain the eighth information from the first AMF that provides services for the first terminal.

Optionally, the first information further includes at least one of the following information: an identifier of the second session, and an identifier of the first media.

Optionally, the transceiver unit 2010 is further configured to: send fifth information to the second terminal, where the fifth information is used to ask whether to agree to transfer the first medium to the second terminal; Sixth information of the second terminal, where the sixth information is used to indicate that the transfer of the first media to the second terminal is agreed.

Optionally, the identifier of the second session is encrypted.

Optionally, when the first terminal enters the coverage of a third access network device from the coverage of the first access network device, the transceiver unit 2010 is further configured to: through the third terminal of the second terminal The third QoS flow of the session receives the second downlink data of the first media; and according to the fifth correspondence, sends the second downlink data to the second terminal through the third DRB of the second terminal, wherein , the fifth correspondence includes a correspondence between the third QoS flow of the third session of the second terminal and the third DRB of the second terminal; wherein, the third session of the The context information is determined according to the context information of the first session, the context information of the third QoS flow is determined according to the context information of the first QoS flow, and the context information of the third DRB is determined according to the The context information of the second DRB is determined.

Optionally, when the first terminal enters the coverage of the third access network device from the coverage of the first access network device, the transceiver unit 2010 is further configured to: receive the The second uplink data of the first media sent by the third DRB; and according to the fifth correspondence, sending the second uplink data through the third QoS flow of the third session of the second terminal, Wherein, the fifth correspondence includes a correspondence between the third QoS flow of the third session of the second terminal and the third DRB of the second terminal.

Optionally, when the second terminal enters the coverage of the second access network device from the coverage of the first access network device, or the first terminal is covered by the first access network device When the range enters the coverage of the third access network device, the processing unit 2020 is further configured to: according to the context information of the second session of the second terminal and/or the context information of the second QoS flow of the second session, determining the context of the third session and/or the context of the third QoS flow, wherein the second session and the second QoS flow are used for the second terminal to transmit the data of the first media, and the second The context information of the second session is determined according to the context information of the first session, the context of the second QoS flow is determined according to the context information of the first QoS flow; and according to the context information of the second DRB , Determine the context information of the third DRB.

Optionally, the transceiving unit 2010 is further configured to: receive seventh information from the second terminal, where the seventh information is used to indicate that the second DRB corresponds to the third session of the second terminal The third QoS flow.

Optionally, the transceiver unit 2010 is further configured to: send tenth information to a second access and mobility management function AMF that provides services for the second terminal, where the tenth information is used to request that the first session Modify the Internet Protocol IP address of the data corresponding to the first QoS flow to the IP address of the third session.

Optionally, when the second terminal enters the coverage of the second access network device from the coverage of the first access network device, the transceiver unit 2010 is further configured to: pass the The first QoS flow receives the third downlink data of the first media; and according to the sixth correspondence, sends the third downlink data to the second access network device through the first forwarding tunnel, wherein the first media The six correspondences include correspondences between the first QoS flow of the first session and the first forwarding tunnel.

Optionally, when the second terminal enters the coverage of the second access network device from the coverage of the first access network device, the transceiving unit 2010 is further configured to: receive the second terminal from the coverage of the second access network device The third uplink data of the first media sent through the first forwarding tunnel; and according to a sixth correspondence, sending the first QoS flow of the first session of the first terminal through the first QoS flow 3. Uplink data, wherein the sixth correspondence includes a correspondence between the first QoS flow of the first session and the first forwarding tunnel.

Optionally, the fourth correspondence further includes a correspondence between the second DRB and the second QoS flow of the second session of the second terminal, and the processing unit 2020 is further configured to: according to the fourth correspondence , establishing the first forwarding tunnel, and generating the sixth correspondence in the context of the first terminal.

Optionally, when the first terminal enters the coverage of a third access network device from the coverage of the first access network device, the transceiving unit 2010 is further configured to: receive the third access network device The fourth downlink data of the first media sent through the second forwarding tunnel; and according to the seventh correspondence, the fourth downlink data is sent to the second terminal through the second DRB, wherein the first media The seven correspondences include correspondences between the second forwarding tunnel and the second DRB.

Optionally, when the first terminal enters the coverage of the third access network device from the coverage of the first access network device, the transceiver unit 2010 is further configured to: receive the The second DBR sends the fourth uplink data of the first media; and according to the seventh correspondence, sends the fourth uplink data to the third access network device through the second forwarding tunnel, wherein the The seventh correspondence includes the correspondence between the second forwarding tunnel and the second DRB.

Optionally, the processing unit 2020 is further configured to: establish the second forwarding tunnel according to the fourth correspondence, and generate the seventh correspondence in the context of the second terminal.

When the apparatus 2000 is used to implement the functions of the second access network device in the above method embodiment, the transceiver unit 2010 is used to: when the second terminal enters the coverage of the second access network device from the coverage of the first access network device When within the range, receiving the third downlink data of the first media sent by the first access network device through the first forwarding tunnel, the first media is the media transferred from the first terminal to the second terminal, the The first terminal is within the coverage of the first access network device and resides in the cell of the first access network device; and according to the eighth corresponding relationship, sends a message to the second terminal through the third data radio bearer DRB The terminal sends the third downlink data, where the eighth correspondence includes a correspondence between the first forwarding tunnel and the third DRB.

Optionally, the transceiver unit 2010 is further configured to: receive the third uplink data of the first medium sent by the second terminal through the third DRB; and according to the eighth correspondence, through the first Sending the third uplink data to the first access network device through a forwarding tunnel.

Optionally, the processing unit 2020 is configured to: establish the first forwarding tunnel; and generate the eighth correspondence in the context of the second terminal.

When the apparatus 2000 is used to implement the functions of the third access network device in the above method embodiment, the transceiver unit 2010 is used to: when the first terminal enters the coverage of the third access network device from the coverage of the first access network device When within the range, the fourth downlink data of the first media is received through the first quality of service QoS flow of the first session of the first terminal, and the first media is the media transferred from the first terminal to the second terminal; and according to the ninth correspondence, sending the fourth downlink data to the first access network device through the second forwarding tunnel, where the ninth correspondence includes the first session of the first terminal The corresponding relationship between the first QoS flow and the second forwarding tunnel, the second terminal resides in the first access network device.

Optionally, the transceiver unit 2010 is further configured to: receive fourth uplink data of the first medium sent by the first access network device through the second forwarding tunnel; and according to the ninth correspondence, through The first QoS flow of the first session of the first terminal sends the fourth uplink data.

Optionally, the processing unit 2020 is configured to: establish the second forwarding tunnel; and generate the nine correspondences in the context of the first terminal.

When the apparatus 2000 is used to implement the function of the second AMF in the above method embodiment, the transceiver unit 2010 is used to: when the second terminal enters the coverage of the second access network device from the coverage of the first access network device, receiving tenth information from the first access network device, where the tenth information is used to request to modify the Internet protocol IP address of the data corresponding to the first quality of service QoS flow of the first session of the first terminal to the IP address of the third session IP address, the first QoS flow of the first session is used by the first terminal to transmit the data of the first media, the first media is the media transferred from the first terminal to the second terminal, the The second terminal is served by the second AMF; acquires the IP address of the third session; and sends eleventh information to the first AMF that provides the service for the first terminal, and the eleventh information is used for requesting to modify the IP address of the data corresponding to the first QoS flow of the first session of the first terminal to the IP address of the third session, and the eleventh information includes the IP address of the third session IP address.

When the device 2000 is used to realize the function of the first AMF in the above method embodiment, the transceiver unit 2010 is used to: receive the eleventh information from the second AMF, and the eleventh information is used to request that the first terminal's first AMF The Internet protocol IP address of the data corresponding to the first quality of service QoS flow of a session is modified to the IP address of the third session, and the eleventh information includes the IP address of the third session; and the first UPF sends the Eleventh information.

For a more detailed description of the transceiver unit 2010 and the processing unit 2020, reference may be made to relevant descriptions in the method embodiments above, and no further description is given here.

As shown in FIG. 21 , the device 2100 includes a processor 2110 and an interface circuit 2120 . The processor 2110 and the interface circuit 2120 are coupled to each other. It can be understood that the interface circuit 2120 may be a transceiver or an input/output interface. Optionally, the device 2100 may further include a memory 2130 for storing instructions executed by the processor 2110, or storing input data required by the processor 2110 to execute the instructions, or storing data generated by the processor 2110 after executing the instructions. When the apparatus 2100 is used to implement the method described above, the processor 2110 is used to implement the functions of the processing unit 2020 described above, and the interface circuit 2120 is used to implement the functions of the transceiver unit 2010 described above.

When the device 2100 is a chip applied to the first terminal, the chip implements the functions of the first terminal in the foregoing method embodiments. The chip receives information from other modules (such as radio frequency modules or antennas) in the first terminal, and the information is sent to the first terminal by other devices; or, the chip sends information to other modules (such as radio frequency modules or antennas) in the first terminal. ) to send information, the information is sent by the first terminal to other devices.

When the device 2100 is a chip applied to the second terminal, the chip implements the functions of the second terminal in the foregoing method embodiments. The chip receives information from other modules (such as radio frequency modules or antennas) in the second terminal, and the information is sent to the second terminal by other devices; or, the chip sends information to other modules (such as radio frequency modules or antennas) in the second terminal. ) to send information, which is sent by the second terminal to other devices.

When the apparatus 2100 is a chip applied to the first access network device, the chip implements the functions of the first access network device in the foregoing method embodiments. The chip receives information from other modules (such as radio frequency modules or antennas) in the first access network device, and the information is sent to the first access network device by other devices; or, the chip sends information to the first access network device Other modules (such as radio frequency modules or antennas) of the device send information, and the information is sent by the first access network device to other devices.

When the apparatus 2100 is a chip applied to the second access network device, the chip implements the functions of the second access network device in the foregoing method embodiments. The chip receives information from other modules (such as radio frequency modules or antennas) in the second access network device, and the information is sent to the second access network device by other devices; or, the chip sends information to the second access network device Other modules (such as radio frequency modules or antennas) of the device send information, and the information is sent to other devices by the second access network device.

When the apparatus 2100 is a chip applied to the third access network device, the chip implements the functions of the third access network device in the foregoing method embodiments. The chip receives information from other modules (such as radio frequency modules or antennas) in the third access network equipment, and the information is sent to the third access network equipment by other devices; or, the chip sends information to the third access network equipment Other modules (such as radio frequency modules or antennas) of the device send information, and the information is sent to other devices by the third access network device.

When the device 2100 is a chip applied to the first AMF, the chip implements the function of the first AMF in the above method embodiment. The chip receives information from other modules (such as radio frequency modules or antennas) in the first AMF, and the information is sent to the first AMF by other devices; or, the chip sends information to other modules (such as radio frequency modules or antennas) in the first AMF. ) to send information, which is sent by the first AMF to other devices.

When the device 2100 is a chip applied to the second AMF, the chip implements the function of the second AMF in the above method embodiment. The chip receives information from other modules (such as radio frequency modules or antennas) in the second AMF, and the information is sent to the second AMF by other devices; or, the chip sends information to other modules (such as radio frequency modules or antennas) in the second AMF. ) to send information, which is sent by the second AMF to other devices.

The present application also provides a communication device, including a processor, the processor is coupled with a memory, the memory is used to store computer programs or instructions and/or data, and the processor is used to execute the computer programs or instructions stored in the memory, or read the memory stored in the memory. data to execute the methods in the above method embodiments. Optionally, there are one or more processors. Optionally, the communication device includes memory. Optionally, there are one or more memories. Optionally, the memory is integrated with the processor, or is set separately.

The present application also provides a computer-readable storage medium, on which is stored the information used to implement the methods described above by the first terminal, the second terminal, the first access network device, the second access network device, and the third access network device. Computer instructions for the method executed by the network access device, the first AMF, or the second AMF.

The present application also provides a computer program product, which includes instructions, and when the instructions are executed by a computer, the above methods in the embodiments are implemented by the first terminal, the second terminal, the first access network device, the second access network device, A method executed by the third access network device, the first AMF, or the second AMF.

The present application also provides a communication system, which includes the first terminal, the second terminal, the first access network device, the second access network device, the third access network device, and the first access network device in the above embodiments. An AMF, or a second AMF.

For explanations and beneficial effects of relevant content in any of the devices provided above, reference may be made to the corresponding method embodiments provided above, and details are not repeated here.

It can be understood that the processor in the embodiments of the present application may be a central processing unit (central processing unit, CPU), and may also be other general processors, digital signal processors (digital signal processor, DSP), application specific integrated circuits (application specific integrated circuit, ASIC), field programmable gate array (field programmable gate array, FPGA) or other programmable logic devices, transistor logic devices, hardware components or any combination thereof. A general-purpose processor can be a microprocessor, or any conventional processor.

The method steps in the embodiments of the present application may be implemented by means of hardware, or may be implemented by means of a processor executing software instructions. Software instructions can be composed of corresponding software modules, and software modules can be stored in random access memory, flash memory, read-only memory, programmable read-only memory, erasable programmable read-only memory, electrically erasable programmable read-only Memory, registers, hard disk, removable hard disk, CD-ROM or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor such the processor can read information from, and write information to, the storage medium. Of course, the storage medium may also be a component of the processor. The processor and storage medium can be located in the ASIC. In addition, the ASIC may be located in the first terminal, the second terminal, the first access network device, the second access network device, the third access network device, the first AMF, or the second AMF. Of course, the processor and the storage medium may also exist as discrete components in the first terminal, the second terminal, the first access network device, the second access network device, the third access network device, the first AMF, or the second AMF.

In the above embodiments, all or part of them may be implemented by software, hardware, firmware or any combination thereof. When implemented using software, it may be implemented in whole or in part in the form of a computer program product. The computer program product comprises one or more computer programs or instructions. When the computer program or instructions are loaded and executed on the computer, the processes or functions described in the embodiments of the present application are executed in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, network equipment, user equipment, or other programmable devices. The computer program or instructions may be stored in or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer program or instructions may be downloaded from a website, computer, A server or data center transmits to another website site, computer, server or data center by wired or wireless means. The computer-readable storage medium may be any available medium that can be accessed by a computer, or a data storage device such as a server or a data center integrating one or more available media. The available medium may be a magnetic medium, such as a floppy disk, a hard disk, or a magnetic tape; it may also be an optical medium, such as a digital video disk; and it may also be a semiconductor medium, such as a solid state disk.

In each embodiment of the present application, if there is no special explanation and logical conflict, the terms and/or descriptions between different embodiments are consistent and can be referred to each other, and the technical features in different embodiments are based on their inherent Logical relationships can be combined to form new embodiments.

It can be understood that the term "at least one" herein refers to one or more, and "multiple" refers to two or more. "And/or" is just an association relationship describing associated objects, which means that there can be three kinds of relationships, for example, A and/or B, which can mean: A exists alone, A and B exist at the same time, and B exists alone. A case where A and B can be singular or plural. In addition, the character "/" in this article generally indicates that the contextual objects are an "or" relationship.

It can be understood that the various numbers involved in the embodiments of the present application are only for convenience of description, and are not used to limit the scope of the embodiments of the present application. The size of the serial numbers of the above-mentioned processes does not mean the order of execution, and the execution order of each process should be determined by its functions and internal logic.

Unless otherwise specified, all technical and scientific terms used in the embodiments of the present application have the same meaning as commonly understood by those skilled in the technical field of the present application. The terms used in the present application are only for the purpose of describing specific embodiments, and are not intended to limit the scope of the present application. It should be understood that the foregoing is an illustration, and the foregoing examples are only intended to help those skilled in the art understand the embodiments of the present application, and are not intended to limit the embodiments of the present application to the illustrated specific values or specific scenarios. Those skilled in the art can obviously make various equivalent modifications or changes based on the examples given above, and such modifications and changes also fall within the scope of the embodiments of the present application.

The above is only a specific implementation of the application, but the scope of protection of the application is not limited thereto. Anyone familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the application. Should be covered within the protection scope of this application. Therefore, the protection scope of the present application should be determined by the protection scope of the claims.

Claims

A method for transmitting data, characterized in that the method comprises:

The first terminal determines to transfer the first media to the second terminal;

The first terminal sends first information to the first access network device, the first information is used to request to transfer the first media to the second terminal, and the first information includes the second terminal The identifier of the first session of the first terminal, and the identifier of the first quality of service QoS flow of the first session, the first session and the first QoS flow are used for the transmission of the first terminal data of the first medium.
The method according to claim 1, further comprising:

The first terminal sends second information to the second terminal, where the second information is used to request transfer of media to the second terminal;

The first terminal receives third information from the second terminal, where the third information includes at least one of the following information: an identifier of the cell where the second terminal is located, an identifier of the second terminal, and An identifier of a second session allocated by the second terminal, where the second session is used for the second terminal to transmit the data of the first media.
The method according to claim 2, wherein the identifier of the second session is encrypted.
The method according to claim 2 or 3, wherein when the third information includes the identifier of the second session, the first information further includes the identifier of the second session.
The method according to any one of claims 2 to 4, wherein when the third information includes the identity of the cell where the second terminal is located, the method further comprises:

The first terminal determines, according to the identifier of the cell where the second terminal is located, that the second terminal resides in the first access network device.
The method according to any one of claims 2 to 5, wherein the second information further includes an identifier of the first medium.
The method according to claim 1, wherein the first information further includes an identifier of the first medium.
The method according to any one of claims 1 to 7, wherein the first terminal sends the first information to the first access network device, comprising:

The first terminal sends the first information to the first access network device through a first access and mobility management function AMF that provides services for the first terminal.
A method for transmitting data, characterized in that the method comprises:

The second terminal acquires first uplink data of a first medium, where the first medium is the medium transferred from the first terminal to the second terminal;

The second terminal determines to send the first uplink data through the second QoS flow of the second session according to the context information of the second QoS flow of the second session;

The second terminal sends the first uplink data to the first access network device through a second data radio bearer DRB according to the first correspondence, where the first correspondence includes the The corresponding relationship between the second QoS flow and the second DRB, the context information of the second session is determined according to the context information of the first session of the first terminal, and the context information of the second QoS flow is determined according to Determined by the context information of the first QoS flow of the first session, the first session and the first QoS flow are used by the first terminal to transmit the data of the first media.
The method according to claim 9, characterized in that the method further comprises:

The second terminal acquires fourth information from the first access network device, where the fourth information includes: an identifier of the second session, an identifier of a second QoS flow, context information of the first session, and context information of the first QoS flow;

The second terminal determines the context information of the second session and the context information of the second QoS flow according to the fourth information, and generates the first correspondence.
The method according to claim 9 or 10, characterized in that the method further comprises:

receiving, by the second terminal, second information from the first terminal, the second information requesting transfer of media to the second terminal;

The second terminal sends third information to the first terminal, where the third information includes at least one of the following information: an identifier of the cell where the second terminal is located, an identifier of the second terminal, and the The ID of the second session.
The method according to claim 11, wherein the second information further includes an identifier of the first medium.
The method according to claim 10, wherein the fourth information further includes at least one of the following information: context information of the second DRB, and an identifier of the first medium.
The method according to any one of claims 9 to 13, further comprising:

The second terminal receives fifth information, where the fifth information is used to ask whether to agree to transfer the first media to the second terminal;

The second terminal sends sixth information, where the sixth information is used to indicate agreement to transfer the first media to the second terminal.
The method according to claim 14, wherein the receiving the fifth information by the second terminal comprises:

The second terminal receives the fifth information from the first access network device; or,

The second terminal receives the fifth information from a first Access and Mobility Management Function AMF serving the first terminal.
The method according to claim 14 or 15, wherein the sixth information further includes an identifier of the second session.
The method according to claim 11 or 16, wherein the identifier of the second session is encrypted.
The method according to any one of claims 9 to 17, wherein when the second terminal enters the coverage area of the second access network device from the coverage area of the first access network device, or the When the first terminal enters the coverage of the third access network device from the coverage of the first access network device, the method further includes:

acquiring, by the second terminal, second uplink data of the first medium;

The second terminal determines to send the second uplink data through the third QoS flow of the third session according to the context information of the third QoS flow of the third session;

The second terminal sends the second uplink data to the first access network device through a third DRB according to the second correspondence, where the second correspondence includes the first session of the third session. The corresponding relationship between the three QoS flows and the third DRB, wherein the context information of the third session is determined according to the context information of the first session, and the context information of the third QoS flow is determined according to the context information of the first session The context information of a QoS flow is determined, and the context information of the third DRB is determined according to the context information of the second DRB.
The method according to claim 18, further comprising:

The second terminal determines the context information of the third session according to the context information of the second session, and/or the second terminal determines the third QoS flow according to the context information of the second QoS flow context information, and/or, the second terminal determines the third DRB context information according to the context information of the second DRB;

The second terminal generates the second correspondence.
The method according to claim 19, wherein the second terminal determines the third session context information according to the context information of the second session, and/or, the second terminal determines the third session context information according to the second session The context information of the second QoS flow determines the third QoS flow context information, and/or, before the second terminal determines the third DRB context information according to the second DRB context information, the method further includes:

The second terminal determines that the third session and/or the third QoS flow and/or the third DRB do not exist.
The method according to claim 19 or 20, wherein the method further comprises:

The second terminal sends seventh information to the first access network device, where the seventh information is used to indicate that the second DRB corresponds to the third session of the third session of the second terminal. QoS flow.
A method for transmitting data, characterized in that the method comprises:

The first access network device receives the first downlink data of the first media through the first quality of service QoS flow of the first session of the first terminal, and the first media is transferred from the first terminal to the second terminal media;

The first access network device sends the first downlink data to the second terminal through the second data radio bearer DRB of the second terminal according to the third correspondence, wherein the third correspondence including the correspondence between the first QoS flow of the first session of the first terminal and the second DRB of the second terminal.
The method according to claim 22, further comprising:

receiving, by the first access network device, the first uplink data of the first medium sent by the second terminal through the second DRB;

The first access network device sends the first uplink data through the first QoS flow of the first session of the first terminal according to a fourth correspondence, where the fourth correspondence includes A correspondence between the second DRB of the second terminal and the first QoS flow of the first session of the first terminal.
The method according to claim 22 or 23, further comprising:

The first access network device receives first information from the first terminal, the first information is used to request to transfer the first media to the second terminal, and the first information includes the An identifier of the second terminal, an identifier of the first session, and an identifier of the first QoS flow;

The first access network device generates the third correspondence in the context of the first terminal according to the first information, and/or generates the fourth correspondence in the context of the second terminal Correspondence.
The method according to claim 24, wherein the first access network device receiving the first information from the first terminal comprises:

The first access network device receives the first information through the first AMF that provides services for the first terminal.
The method according to claim 24 or 25, wherein the method further comprises:

The first access network device acquires eighth information, where the eighth information includes context information of the first session and context information of the first QoS flow;

The first access network device sends fourth information to the second terminal, where the fourth information includes: an identifier of the second session, an identifier of the second QoS flow, context information of the first session, and the The context information of the first QoS flow, wherein the second QoS flow of the second session is used for the second terminal to transmit the data of the first media, and the context information of the first session is used for the The second terminal determines the context of the second session, and the context information of the first QoS flow is used by the second terminal to determine the context of the second QoS flow.
The method according to claim 26, wherein the obtaining of the eighth information by the first access network device comprises:

The first access network device acquires the eighth information from the first AMF that provides services for the first terminal.
The method according to claim 26 or 27, wherein the fourth information further includes at least one of the following information: context information of the second DRB, and an identifier of the first medium.
The method according to any one of claims 24 to 28, wherein the first information further includes at least one of the following information: an identifier of the second session, and an identifier of the first media.
The method according to any one of claims 24 to 29, further comprising:

The first access network device sends fifth information to the second terminal, where the fifth information is used to ask whether to agree to transfer the first medium to the second terminal;

The first access network device receives sixth information from the second terminal, where the sixth information is used to indicate agreement to transfer the first medium to the second terminal.
The method according to claim 30, wherein the sixth information further includes an identifier of the second session.
The method according to claim 29 or 30, wherein the identifier of the second session is encrypted.
The method according to any one of claims 22 to 32, wherein when the first terminal enters the coverage of the third access network device from the coverage of the first access network device, the The method also includes:

The first access network device receives the second downlink data of the first media through the third QoS flow of the third session of the second terminal;

The first access network device sends the second downlink data to the second terminal through the third DRB of the second terminal according to the fifth correspondence, where the fifth correspondence includes the first a correspondence between the third QoS flow of the third session of the second terminal and the third DRB of the second terminal;

Wherein, the context information of the third session is determined according to the context information of the first session, the context information of the third QoS flow is determined according to the context information of the first QoS flow, and the third The context information of the DRB is determined according to the context information of the second DRB.
The method according to any one of claims 22 to 32, wherein when the first terminal enters the coverage of the third access network device from the coverage of the first access network device, the The method also includes:

receiving, by the first access network device, second uplink data of the first medium sent by the second terminal through the third DRB;

The first access network device sends the second uplink data through the third QoS flow of the third session of the second terminal according to a fifth correspondence, where the fifth correspondence includes A correspondence between the third QoS flow of the third session of the second terminal and the third DRB of the second terminal.
The method according to any one of claims 22 to 34, wherein when the second terminal enters the coverage area of the second access network device from the coverage area of the first access network device, or the When the first terminal enters the coverage of the third access network device from the coverage of the first access network device, the method further includes:

The first access network device determines the context of the third session and/or the second session of the second session according to the context information of the second session of the second terminal and/or the context information of the second QoS flow of the second session A context of three QoS flows, wherein the second session and the second QoS flow are used by the second terminal to transmit data of the first media, and the context information of the second session is based on the first session The context information of the second QoS flow is determined according to the context information of the first QoS flow;

The first access network device determines the context information of the third DRB according to the context information of the second DRB.
The method according to claim 35, further comprising:

The first access network device receives seventh information from the second terminal, where the seventh information is used to indicate that the second DRB corresponds to the second DRB of the third session of the second terminal Three QoS flows.
The method according to claim 35 or 36, further comprising:

The first access network device sends tenth information to a second access and mobility management function AMF that provides services for the second terminal, where the tenth information is used to request that the The Internet Protocol IP address of the data corresponding to the first QoS flow is changed to the IP address of the third session.
The method according to any one of claims 23 to 32, wherein when the second terminal enters the coverage area of the second access network device from the coverage area of the first access network device, the The method also includes:

receiving, by the first access network device, third downlink data of the first media through the first QoS flow of the first session;

The first access network device sends the third downlink data to the second access network device through a first forwarding tunnel according to a sixth correspondence, where the sixth correspondence includes the first session The corresponding relationship between the first QoS flow and the first forwarding tunnel.
The method according to any one of claims 23 to 32, wherein when the second terminal enters the coverage area of the second access network device from the coverage area of the first access network device, the The method also includes:

receiving, by the first access network device, third uplink data of the first medium sent by the second access network device through the first forwarding tunnel;

The first access network device sends the third uplink data through the first QoS flow of the first session of the first terminal according to a sixth correspondence, where the sixth correspondence includes A correspondence between the first QoS flow of the first session and the first forwarding tunnel.
The method according to claim 38 or 39, wherein the fourth correspondence further includes a correspondence between the second DRB and the second QoS flow of the second session of the second terminal, the method Also includes:

The first access network device establishes the first forwarding tunnel according to the fourth correspondence, and generates the sixth correspondence in the context of the first terminal.
The method according to any one of claims 23 to 32, wherein when the first terminal enters the coverage of the third access network device from the coverage of the first access network device, the The method also includes:

The first access network device receives the fourth downlink data of the first medium sent by the third access network device through the second forwarding tunnel;

The first access network device sends the fourth downlink data to the second terminal through the second DRB according to a seventh correspondence, where the seventh correspondence includes the second forwarding tunnel and The corresponding relationship of the second DRB.
The method according to claim 41, wherein when the first terminal enters the coverage of the third access network device from the coverage of the first access network device, the method further comprises:

receiving, by the first access network device, fourth uplink data of the first medium sent by the second terminal through the second DBR;

The first access network device sends the fourth uplink data to the third access network device through the second forwarding tunnel according to a seventh correspondence, where the seventh correspondence includes the first Two forwarding tunnels and the correspondence between the second DRB.
The method according to claim 41 or 42, further comprising:

The first access network device establishes the second forwarding tunnel according to the fourth correspondence, and generates the seventh correspondence in the context of the second terminal.
A communication device, characterized by comprising:

A processor configured to execute the computer program stored in the memory, so that the device executes the method according to any one of claims 1 to 43.
The apparatus of claim 44, further comprising the memory.
A computer-readable storage medium, characterized in that a computer program is stored on the computer-readable storage medium, and when the computer program runs on a computer, the computer executes any one of claims 1-43. method described in the item.
A computer program product, characterized in that the computer program product comprises instructions for performing the method according to any one of claims 1 to 43.
A communication system, characterized by comprising: a first terminal and a second terminal;

The first terminal is configured to execute the method according to any one of claims 1 to 8;

The second terminal is configured to execute the method according to any one of claims 9-21.