CN115696299A - Communication method, communication device and communication system - Google Patents

Abstract

The present application provides a communication method, a communication device and a communication system. In this method, the first policy control network element determines the mobility management policy according to the session state or the application state of the terminal, so that the precise determination of the mobility management policy can be realized. Moreover, since the first policy control network element only needs to save the event identification information and notification address to the data management network element, it can receive the session state of the terminal or the application state of the terminal from the second policy control network element, without The first policy control network element is required to query the address information of the second policy control network element, thereby reducing the signaling overhead of the first policy control network element.

Description

Communication method, communication device and communication system

This application is required to be submitted to the Intellectual Property Office of the People's Republic of China on July 30, 2021, and the application number is 202110875024.1, the priority of the Chinese patent application titled "Communication Method, Communication Device and Communication System", The entire contents of which are incorporated by reference in this application.

technical field

The present application relates to the technical field of wireless communication, and in particular to a communication method, a communication device and a communication system.

Background technique

In the fifth generation (5th generation, 5G) system, when a terminal registers with an access and mobility management function (AMF) network element, the AMF network element and the access and mobility management policy control network An access and mobility management policy control function (AM PCF) network element interacts to establish an access and mobility policy association (access and mobility policy association, AMpolicy association). Then the AM PCF network element formulates a mobility policy and provides it to the AMF network element for policy execution of the AMF network element.

However, how to accurately determine the mobility management strategy needs to be solved at present.

Contents of the invention

The present application provides a communication method, a communication device and a communication system, so as to accurately determine a mobility management strategy.

In a first aspect, the embodiment of the present application provides a communication method, and the method may be executed by a first policy control network element or a module (such as a chip) applied to the first policy control network element. Taking the first policy control network element to execute the method as an example, the first policy control network element sends a request message to the data management network element, the request message includes terminal identification information, event identification information and notification address, and the event identification information is used In order to indicate the state of the detection session or the state of the application, the notification address is the address of the first policy control network element used to receive the event notification corresponding to the event identification information, and the request message is used to request the data management network element to save the Event identification information and the notification address; the first policy control network element receives a notification message from the second policy control network element, and the notification message includes the session status of the terminal or the application status of the terminal, and the session status of the terminal The state of the terminal or the state of the application of the terminal is detected according to the event identification information obtained from the data management network element; the first policy control network element determines the mobile mobility management policy; wherein, the first policy control network element is used to formulate a mobility management policy, and the second policy control network element is used to formulate a session management policy.

According to the above solution, the first policy control network element determines the mobility management policy according to the session state or the application state of the terminal, which can accurately determine the mobility management policy. Moreover, since the first policy control network element only needs to save the event identification information and notification address to the data management network element, it can receive the session state of the terminal or the application state of the terminal from the second policy control network element, without The first policy control network element is required to query the address information of the second policy control network element, thereby reducing the signaling overhead of the first policy control network element.

As a possible implementation method, when the session state of the terminal is session establishment or the application state of the terminal is application start, the first policy control network element determines the mobility management strategy.

According to the above solution, it is possible to accurately determine the mobility management policy.

As a possible implementation method, the application layer information includes (data network name (data networkname, DNN), single network slice selection assistance information (single network slice selection assistance information, S-NSSAI)) combination, and the request message also includes Including the (DNN, S-NSSAI) combination, the second policy control network element corresponds to the (DNN, S-NSSAI) combination.

According to the above solution, refined management of event identification information based on (DNN, S-NSSAI) combination can be realized.

As a possible implementation method, the request message also includes first indication information, and the first indication information is used to indicate a notification policy. The notification policy is: when the first (DNN, S-NSSAI) combination corresponds to The notification message is sent when the session is established, and/or the notification message is sent when the last session corresponding to the (DNN, S-NSSAI) combination terminates.

According to the above solution, the number of sending notification messages can be reduced, thereby reducing signaling overhead.

As a possible implementation method, the mobility management policy includes second indication information, where the second indication information is used to indicate that the mobility management policy is determined according to the application layer information.

According to the above solution, the device that receives the mobility management policy can know that the mobility management policy is determined according to the application layer information, which helps to realize the rational use of the mobility management policy.

As a possible implementation method, the first policy control network element receives a response message from the data management network element, the response message includes first identification information, and the first identification information is the event identification information and the notification address The first identification information is used to modify or delete the event identification information and/or the notification address.

According to this solution, it is possible to quickly modify or delete the event identification information and the notification address saved by the data management network element.

As a possible implementation method, the first policy control network element sends the mobility management policy to the application function network element.

As a possible implementation method, the first policy control network element receives third indication information from the mobility management network element, where the third indication information is used to indicate that the mobility management policy used by the terminal is determined according to the application layer information The first policy control network element delays determining the mobility management policy according to the third indication information; wherein the first policy control network element is a policy control network element that provides services for the terminal after the terminal moves.

According to the solution, it is helpful to accurately determine the mobility management strategy.

In a second aspect, the embodiment of the present application provides a communication method, and the method may be executed by a second policy control network element or a module (such as a chip) applied to the second policy control network element. Taking the method executed by the second policy control network element as an example, the second policy control network element receives the event identification information and notification address from the data management network element, the event identification information is used to indicate the state of the detection session or the state of the application, the The notification address is the address of the first policy control network element used to receive the event notification corresponding to the event identification information; the second policy control network element detects the session status of the terminal or the application status of the terminal according to the event identification information; The second policy control network element sends a notification message to the first policy control network element according to the notification address, and the notification message includes the session state of the terminal or the application state of the terminal; wherein, the first policy control The network element is used to formulate a mobility management policy, and the second policy control network element is used to formulate a session management policy.

According to the above solution, the session status or application status of the terminal can be used by the first policy control network element to determine the mobility management policy, which can realize accurate determination of the mobility management policy. Moreover, the second policy control network element can obtain the event identification information of the event to be detected from the data management network element, and obtain the address of the first policy control network element that receives the event notification, so that the event notification can be quickly notified to The first policy controls the network element.

As a possible implementation method of the first aspect or the second aspect, the notification message further includes at least one of a session identifier of the terminal, an address of the terminal, or an identifier of the second policy control network element.

As a possible implementation method, the second policy control network element sends a query request message to the data management network element, and the query request message is used to request to query the subscription data of the terminal; A query response message of the data management network element, the query response message includes the subscription data of the terminal, and the subscription data includes the event identification information and the notification address.

According to the above solution, the second policy control network element can obtain the event identification information and notification address from the data management network element in real time through the query request, which helps the second policy control network element to obtain the event identification information and notification address in time .

As a possible implementation method, the query request message also includes a (DNN, S-NSSAI) combination, the second policy control network element corresponds to the (DNN, S-NSSAI) combination, and the query request message is used to request query Subscription data corresponding to the (DNN, S-NSSAI) combination of the terminal.

As a possible implementation method, the second strategy controls the network element to send a subscription data subscription request message to the data management network element, and the subscription data subscription request message is used to request a notification of a change in the subscription data of the terminal; the second strategy The control network element receives the notification message from the data management network element, the notification message includes the changed subscription data of the terminal, and the changed subscription data includes the event identification information and the notification address.

According to the above scheme, it is not necessary for the second policy control network element to frequently send query request messages to the data management network element for requesting to query the subscription data of the terminal. Instead, by sending a subscription data subscription request message, the subsequent data management network can The element actively sends the subscription data of the terminal to the second policy control network element, so signaling overhead can be reduced.

As a possible implementation method, the subscription data subscription request message also includes a (DNN, S-NSSAI) combination, the second policy control network element corresponds to the (DNN, S-NSSAI) combination, and the subscription data subscription request uses It is used to request the notification of the subscription data change corresponding to the (DNN, S-NSSAI) combination of the terminal.

In a third aspect, the embodiment of the present application provides a communication method, and the method may be executed by a data management network element or a module (such as a chip) applied to the data management network element. Taking the method performed by the data management network element as an example, the data management network element receives a request message from the first policy control network element, the request message includes terminal identification information, event identification information and notification address, and the event identification information is used for Indicates the state of the detection session or the state of the application, the notification address is the address of the first policy control network element used to receive the event notification corresponding to the event identification information; the request message is used to request the data management network element to save the event Identification information and the notification address; the data management network element sends the event identification information and the notification address to the second policy control network element; wherein, the first policy control network element is used to formulate a mobility management policy, and the second policy The control network element is used to formulate session management policies.

According to the above solution, the data management network element, as an intermediate node connecting the first policy control network element and the second policy control network element, can receive terminal identification information, event identification information and notification address from the first policy control network element, and The event identification information and the notification address are used to facilitate the second policy control network element to detect according to the event identification information, and send the detected event to the first policy control network element, thereby eliminating the need for the first policy control network element to search for the second policy control network element. The second strategy is the process of controlling the address of the network element, which can reduce unnecessary signaling overhead.

As a possible implementation method, the data management network element receives a query request message from the second policy control network element, and the query request message is used to request to query the subscription data of the terminal; the data management network element sends the second The policy control network element sends a query response message, the query response message includes the subscription data of the terminal, and the subscription data includes the event identification information and the notification address.

According to the above solution, the data management network element can send event identification information and notification address to the second policy control network element in real time according to the query request sent by the second policy control network element, which helps the second policy control network element to obtain timely to the event identification information and notification address.

As a possible implementation method, the query request message also includes a (DNN, S-NSSAI) combination, the second policy control network element corresponds to the (DNN, S-NSSAI) combination, and the query request message is used to request query Subscription data corresponding to the (DNN, S-NSSAI) combination of the terminal.

As a possible implementation method, the data management network element receives the subscription data subscription request message from the second policy control network element, and the subscription data subscription request message is used to request the notification of the subscription data change of the terminal; the data management The network element sends a notification message to the second policy control network element, the notification message includes the changed subscription data of the terminal, and the changed subscription data includes the event identification information and the notification address.

According to the above scheme, it is not necessary for the second policy control network element to frequently send query request messages to the data management network element for requesting to query the subscription data of the terminal. Instead, by sending a subscription data subscription request message, the subsequent data management network can The element actively sends the subscription data of the terminal to the second policy control network element, so signaling overhead can be reduced.

As a possible implementation method, the subscription data subscription request message also includes a (DNN, S-NSSAI) combination, the second policy control network element corresponds to the (DNN, S-NSSAI) combination, and the subscription data subscription request uses It is used to request the notification of the subscription data change corresponding to the (DNN, S-NSSAI) combination of the terminal.

As a possible implementation method, the data management network element sends a response message to the first policy control network element, the response message includes first identification information, and the first identification information is the event identification information and the notification address Identification information, where the first identification information is used to modify or delete the event identification information and/or the notification address.

According to this solution, it is possible to quickly modify or delete the event identification information and the notification address saved by the data management network element.

In a fourth aspect, the embodiment of the present application provides a communication method, and the method may be executed by a first policy control network element or a module (such as a chip) applied to the first policy control network element. Taking the method executed by the first policy control network element as an example, the first policy control network element sends a request message to the data management network element, the request message includes first identification information and a first notification address, and the first identification information is the The event identification information stored by the data management network element and the identification information of the second notification address, the event identification information is used to indicate the state of the detection session or the application state, and the first notification address is used to receive the event corresponding to the event identification information The address of the first policy control network element notified, the second notification address is the address of the third policy control network element used to receive the event notification corresponding to the event identification information, and the request message is used to request the data management network element updating the second notification address to the first notification address; the first policy control network element receives a notification message from the second policy control network element, where the notification message includes the session status of the terminal or the application status of the terminal, The state of the session of the terminal or the state of the application of the terminal is detected according to the event identification information obtained from the data management network element; the first policy control network element is based on the state of the session of the terminal or the application of the terminal The status determines the mobility management policy; wherein, the first policy control network element and the third policy control network element are used to formulate mobility management policies, the second policy control network element is used to formulate session management policies, and the first policy control network element is used to formulate session management policies. The policy control network element is a policy control network element that provides services for the terminal after the terminal moves, and the third policy control network element is a policy control network element that provides services for the terminal before the terminal moves.

According to the above solution, the first policy control network element determines the mobility management policy according to the session state or the application state of the terminal, which can accurately determine the mobility management policy. Moreover, since the first policy control network element modifies the second event notification address saved by the data management network element through the first identification information, the subsequent second policy control network element can obtain the event identification information and the updated event identification information from the data management network element. The first notification address, and then the first policy control network element can receive the session status of the terminal or the application status of the terminal from the second policy control network element, without the need for the first policy control network element to query the second policy The address information of the network element is controlled, so that the signaling overhead of the first policy control network element can be reduced.

As a possible implementation method, the notification message further includes at least one of a session identifier of the terminal, an address of the terminal, or an identifier of the second policy control network element.

In a fifth aspect, the embodiment of the present application provides a communication method, and the method may be executed by a first policy control network element or a module (such as a chip) applied to the first policy control network element. Taking the method executed by the first policy control network element as an example, the first policy control network element sends a first request message to the mobility management network element, the first request message contains event identification information, and the event identification information is used to indicate detection The state of the session of the terminal or the state of the application of the terminal, the first request message is used to request the event notification corresponding to the event identification information; the first policy control network element receives from the mobility management network element or the session corresponding to the session managing the first notification message of the network element, the first notification message includes the session state of the terminal or the application state of the terminal, and the session state of the terminal or the application state of the terminal is detected according to the event identification information Obtained: the first policy control network element determines the mobility management policy according to the state of the session of the terminal or the state of the application of the terminal; wherein, the first policy control network element is used to formulate the mobility management policy.

According to the above solution, the first policy control network element determines the mobility management policy according to the session state or the application state of the terminal, which can accurately determine the mobility management policy. Moreover, since the first policy control network element only needs to send the event identification information to the mobility management network element, it can quickly receive the session status of the terminal or the application status of the terminal, which helps to improve the determination of the mobility management strategy speed.

As a possible implementation method, when the state of the session is session establishment or the state of the application is application start, the first policy control network element determines the mobility management policy according to the application layer information from the application function network element.

According to the above solution, it is possible to accurately determine the mobility management policy.

As a possible implementation method, the first request message further includes the (DNN, S-NSSAI) combination, and the (DNN, S-NSSAI) combination is determined according to the application layer information from the application function network element.

As a possible implementation method, the state of the session includes establishment of the session corresponding to the (DNN, S-NSSAI) combination or termination of the session corresponding to the (DNN, S-NSSAI) combination.

As a possible implementation method, the first request message also includes first indication information, and the first indication information is used to indicate a notification policy, and the notification policy is: when the (DNN, S-NSSAI) combination corresponds to the first The first notification message is sent when a session is established, and/or the first notification message is sent when the last session corresponding to the (DNN, S-NSSAI) combination terminates.

According to the above solution, the number of sending notification messages can be reduced, thereby reducing signaling overhead.

As a possible implementation method, the state of the session is: establishment of the first session corresponding to the (DNN, S-NSSAI) combination, or termination of the last session corresponding to the (DNN, S-NSSAI) combination.

As a possible implementation method, the mobility management policy includes second indication information, where the second indication information is used to indicate that the mobility management policy is determined according to application layer information.

According to the above solution, the device that receives the mobility management policy can know that the mobility management policy is determined according to the application layer information, which helps to realize the rational use of the mobility management policy.

As a possible implementation method, the first policy control network element sends the mobility management policy to the application function network element.

As a possible implementation method, when the session state of the terminal is session establishment or the application state is application start, the first policy control network element determines the mobility management policy according to the application layer information from the application function network element .

As a possible implementation method, the session status is used to indicate the establishment of the first session corresponding to the (DNN, S-NSSAI) combination or the termination of the last session corresponding to the (DNN, S-NSSAI) combination.

In a sixth aspect, the embodiment of the present application provides a communication method, and the method may be executed by a session management network element or a module (such as a chip) applied to the session management network element. Taking the method performed by the session management network element as an example, the session management network element receives the second request message from the mobility management network element, and the second request message includes event identification information, and the event identification information is used to indicate the detection terminal session The state of the terminal or the state of the application of the terminal, the second request message is used to request the event notification corresponding to the event identification information; the session management network element detects the session state of the terminal or the application of the terminal according to the event identification information state; the session management network element sends a notification message to the mobility management network element or the first policy control network element corresponding to the terminal, and the notification message includes the state of the session of the terminal or the state of the application of the terminal; wherein the The first policy control network element is a policy control network element used to formulate mobility management policies.

According to the above solution, the session status or application status of the terminal can be used by the first policy control network element to determine the mobility management policy, which can realize accurate determination of the mobility management policy.

As a possible implementation method, the second request message also includes a (DNN, S-NSSAI) combination, and the second request message is used to request the session of the terminal corresponding to the (DNN, S-NSSAI) combination state or the state of the application.

As a possible implementation method, the second request message also includes first indication information, and the first indication information is used to indicate a notification policy, and the notification policy is: when the (DNN, S-NSSAI) combination corresponds to the first The notification message is sent when a session is established, and/or the notification message is sent when the last session corresponding to the (DNN, S-NSSAI) combination terminates.

According to the above solution, the number of sending notification messages can be reduced, thereby reducing signaling overhead.

In a seventh aspect, the embodiment of the present application provides a communication method, and the method may be executed by a mobility management network element or a module (such as a chip) applied to the mobility management network element. Taking the mobility management network element executing the method as an example, the mobility management network element receives a first request message from a first policy control network element, the first request message includes event identification information, and the event identification information is used to indicate detection The state of the session of the terminal or the state of the application of the terminal, the first request message is used to request the event notification corresponding to the event identification information; after the mobility management network element detects the event corresponding to the event identification information, it sends the first The policy control network element sends a first notification message, the first notification message includes the session state of the terminal or the application state of the terminal, and the session state of the terminal or the application state of the terminal is detected according to the event identification information; wherein , the first policy control network element is used to formulate a mobility management policy.

According to the above solution, the session status or application status of the terminal can be used by the first policy control network element to determine the mobility management policy, which can realize accurate determination of the mobility management policy.

As a possible implementation method of the fifth aspect or the seventh aspect, the first request message further includes a (DNN, S-NSSAI) combination, and the first request message is used to request the terminal's connection with the (DNN, S-NSSAI) -NSSAI) combination corresponds to the state of the session or the state of the application.

According to the above solution, refined management of event identification information based on (DNN, S-NSSAI) combination can be realized.

As a possible implementation method, the mobility management network element sends the first notification message to the first policy control network element after detecting that the session corresponding to the (DNN, S-NSSAI) combination of the terminal is established , the first notification message includes the state of the session, and the state of the session is session establishment.

As a possible implementation method, the mobility management network element sends the first notification message to the first policy control network element after detecting that the session of the terminal corresponding to the (DNN, S-NSSAI) combination is terminated , the first notification message includes the state of the session, and the state of the session is session termination.

As a possible implementation method, the first request message also includes first indication information, and the first indication information is used to indicate a notification policy, and the notification policy is: when the (DNN, S-NSSAI) combination corresponds to the first The first notification message is sent when a session is established, and/or the first notification message is sent when the last session corresponding to the (DNN, S-NSSAI) combination terminates.

As a possible implementation method, the state of the session is: the first session corresponding to the (DNN, S-NSSAI) combination is established, or the last session corresponding to the (DNN, S-NSSAI) combination is terminated.

As a possible implementation method, after the mobility management network element detects that the first session corresponding to the (DNN, S-NSSAI) combination of the terminal is established, it sends the second A notification message, the first notification message includes the state of the session, and the state of the session is session establishment.

As a possible implementation method, the mobility management network element sends the first A notification message, the first notification message includes the state of the session, and the state of the session is session termination.

As a possible implementation method, the mobility management network element sends a second request message to the session management network element, the second request message includes the event identification information, and the second request message is used to request that the event identification information correspond to event notification; the mobility management network element receives a second notification message from the session management network element, and the second notification message includes the state of the application of the terminal or the state of the session of the terminal; the mobility management network element Send the first notification message to the first policy control network element.

As a possible implementation method of any aspect from the first aspect to the seventh aspect, the event identification information is determined according to the application layer information from the application function network element.

In an eighth aspect, the embodiment of the present application provides a communication device, and the device may be a first policy control network element, or may be a chip used for the first policy control network element. The device has the function of realizing any realization method of the first aspect, the fourth aspect or the fifth aspect. This function may be implemented by hardware, or may be implemented by executing corresponding software on the hardware. The hardware or software includes one or more modules corresponding to the above functions.

In a ninth aspect, the embodiment of the present application provides a communication device. The device may be a second policy control network element, or may be a chip used for the second policy control network element. The device has the function of implementing any implementation method of the second aspect above. This function may be implemented by hardware, or may be implemented by executing corresponding software on the hardware. The hardware or software includes one or more modules corresponding to the above functions.

In a tenth aspect, the embodiment of the present application provides a communication device, and the device may be a data management network element, or may be a chip used for the data management network element. The device has the function of realizing any realization method of the third aspect above. This function may be implemented by hardware, or may be implemented by executing corresponding software on the hardware. The hardware or software includes one or more modules corresponding to the above functions.

In an eleventh aspect, the embodiment of the present application provides a communication device, and the device may be a session management network element, or may be a chip used for the session management network element. The device has the function of implementing any implementation method of the sixth aspect above. This function may be implemented by hardware, or may be implemented by executing corresponding software on the hardware. The hardware or software includes one or more modules corresponding to the above functions.

In a twelfth aspect, the embodiment of the present application provides a communication device, and the device may be a mobility management network element, or may be a chip used for the mobility management network element. The device has the function of implementing any implementation method of the seventh aspect above. This function may be implemented by hardware, or may be implemented by executing corresponding software on the hardware. The hardware or software includes one or more modules corresponding to the above functions.

In a thirteenth aspect, the embodiment of the present application provides a communication device, including a processor and a memory; the memory is used to store computer instructions, and when the device is running, the processor executes the computer instructions stored in the memory, so that the device Execute any implementation method in the first aspect to the seventh aspect above.

In a fourteenth aspect, the embodiment of the present application provides a communication device, including a unit or means (means) for performing each step of any implementation method in the first aspect to the seventh aspect.

In the fifteenth aspect, the embodiment of the present application provides a communication device, including a processor and an interface circuit, the processor is used to communicate with other devices through the interface circuit, and execute any implementation method in the first aspect to the seventh aspect above . The processor includes one or more.

In the sixteenth aspect, the embodiment of the present application provides a communication device, including a processor coupled to the memory, the processor is used to call the program stored in the memory, so as to execute any implementation in the first aspect to the seventh aspect above method. The memory may be located within the device or external to the device. And there may be one or more processors.

In the seventeenth aspect, the embodiment of the present application also provides a computer-readable storage medium, the computer-readable storage medium stores instructions, and when it runs on the communication device, the above-mentioned first to seventh aspects Any implementation method of is executed.

In the eighteenth aspect, the embodiment of the present application also provides a computer program product, the computer program product includes a computer program or instruction, when the computer program or instruction is run by the communication device, any of the above first to seventh aspects The implementation method is executed.

In a nineteenth aspect, the embodiment of the present application further provides a chip system, including: a processor, configured to execute any implementation method in the first aspect to the seventh aspect above.

In a twentieth aspect, the embodiment of the present application also provides a communication system, the communication system includes a first policy control network element for performing any implementation method of the first aspect above and a network element for sending a message to the first policy control network The second policy control network element that sends the notification message.

As a possible implementation method, the second policy control network element is further configured to implement any implementation method of the second aspect above.

As a possible implementation method, the communication system further includes a data management network element configured to implement any implementation method of the third aspect above.

In the twenty-first aspect, the embodiment of the present application also provides a communication system, the communication system includes a first policy control network element for performing any implementation method of the fourth aspect above and a network element for sending the first policy control network element The second policy controlling the network element sending the notification message by the network element.

As a possible implementation method, the second policy control network element is further configured to implement any implementation method of the second aspect above.

As a possible implementation method, the communication system further includes a data management network element configured to implement any implementation method of the third aspect above.

In the twenty-second aspect, the embodiment of the present application also provides a communication system, the communication system includes a first policy control network element for performing any implementation method of the fifth aspect above and for receiving information from the first policy The mobility management network element controlling the first request message of the network element.

As a possible implementation method, the mobility management network element is further configured to implement any implementation method of the seventh aspect above.

As a possible implementation method, the communication system further includes a session management network element configured to implement any implementation method of the sixth aspect above.

Description of drawings

FIG. 1(a) is a schematic diagram of a communication system provided by an embodiment of the present application;

Figure 1(b) is a schematic diagram of another communication system provided by the embodiment of the present application;

Figure 2(a) is a schematic diagram of a 5G network architecture based on a service architecture;

Figure 2(b) is a schematic diagram of a 5G network architecture based on a point-to-point interface;

FIG. 3 is a schematic flowchart of AM strategy generation and use provided by the embodiment of the present application;

FIG. 4 is a schematic flow diagram of AM strategy generation and use provided by the embodiment of the present application;

FIG. 5(a) is a schematic flow diagram of a communication method provided by an embodiment of the present application;

FIG. 5(b) is a schematic flow diagram of a communication method provided by an embodiment of the present application;

FIG. 5(c) is a schematic flow diagram of a communication method provided by an embodiment of the present application;

FIG. 6 is a schematic flowchart of a communication method provided by an embodiment of the present application;

FIG. 7 is a schematic flowchart of a communication method provided by an embodiment of the present application;

FIG. 8 is a schematic flowchart of a communication method provided by an embodiment of the present application;

FIG. 9 is a schematic flowchart of a communication method provided by an embodiment of the present application;

FIG. 10 is a schematic flowchart of a communication method provided by an embodiment of the present application;

Fig. 10(a) is a schematic flowchart of a communication method provided by the embodiment of the present application;

FIG. 11 is a schematic diagram of a communication device provided in an embodiment of the present application;

FIG. 12 is a schematic diagram of a communication device provided by an embodiment of the present application.

Detailed ways

In order to accurately determine the AM policy, as shown in Figure 1(a), the present application provides a communication system, the system includes a first policy control network element and a second policy control network element, and optionally, a data management network Yuan.

In the first example:

The first policy control network element is used to send a request message to the data management network element, the request message includes terminal identification information, event identification information and notification address, and the event identification information is used to indicate the state of the detection session or the state of the application , the notification address is the address of the first policy control network element used to receive the event notification corresponding to the event identification information, and the request message is used to request the data management network element to store the event identification information and the notification address; and receiving A notification message from the second policy control network element, the notification message includes the session state of the terminal or the application state of the terminal, and the session state of the terminal or the application state of the terminal is obtained according to the The first policy control network element determines the mobility management policy according to the state of the session of the terminal or the state of the application of the terminal. The second policy control network element is configured to send the notification message to the first policy control network element. Wherein, the first policy control network element is used to formulate a mobility management policy, and the second policy control network element is used to formulate a session management policy.

As a possible implementation method, the second policy control network element is also used to receive the event identification information and the notification address from the data management network element; according to the event identification information, detect the session status of the terminal or the The state of the application. The second policy control network element is configured to send a notification message to the first policy control network element according to the notification address.

As a possible implementation method, the data management network element is configured to receive the request message from the first policy control network element, and send the event identification information and the notification address to the second policy control network element.

As a possible implementation method, the first policy control network element is configured to receive a response message from the data management network element, where the response message includes first identification information, and the first identification information is the event identification information and The identification information of the notification address, the first identification information is used to modify or delete the event identification information and/or the notification address. The data management network element is configured to send the response message to the first policy control network element.

As a possible implementation method, the second policy control network element is used to send a query request message to the data management network element, and the query request message is used to request to query the subscription data of the terminal; The query response message of the element, the query response message includes the subscription data of the terminal, and the subscription data includes the event identification information and the notification address. The data management network element is configured to receive the query request message from the second policy control network element, and send the query response message to the second policy control network element.

As a possible implementation method, the second policy control network element is configured to send a subscription data subscription request message to the data management network element, where the subscription data subscription request message is used to request a notification of a change in the subscription data of the terminal; and Receive a notification message from the data management network element, where the notification message includes the changed subscription data of the terminal, and the changed subscription data includes the event identification information and the notification address. The data management network element is configured to receive the subscription data subscription request message from the second policy control network element; and send the notification message to the second policy control network element.

In the second embodiment:

The first policy control network element is configured to send a request message to the data management network element, where the request message includes first identification information and a first notification address, where the first identification information is the event identification information stored by the data management network element and The identification information of the second notification address, where the event identification information is used to indicate the state of the detection session or the application state, and the first notification address is the first policy control network element used to receive the event notification corresponding to the event identification information address, the second notification address is the address of the third policy control network element used to receive the event notification corresponding to the event identification information, and the request message is used to request the data management network element to update the second notification address to the first A notification address; receiving a notification message from the second policy control network element, the notification message includes the state of the session of the terminal or the state of the application of the terminal, and the state of the session of the terminal or the state of the application of the terminal is obtained from the The event identification information obtained by the data management network element is detected; and the mobility management policy is determined according to the session state of the terminal or the application state of the terminal. The second policy control network element is configured to send the notification message to the first policy control network element. Wherein, the first policy control network element and the third policy control network element are used to formulate a mobility management policy, the second policy control network element is used to formulate a session management policy, and the first policy control network element is the terminal mobility The third policy control network element is a policy control network element that provides services for the terminal before the terminal moves.

As a possible implementation method, the second policy control network element is also used to receive the event identification information and the first notification address from the data management network element; according to the event identification information, detect the state of the session of the terminal or the terminal and sending a notification message to the first policy control network element according to the first notification address.

As a possible implementation method, the data management network element is configured to receive the request message from the first policy control network element, and send the event identification information and the first notification address to the second policy control network element.

Based on the first embodiment or the second embodiment above:

As a possible implementation method, when the session state of the terminal is session establishment or the application state of the terminal is application start, the first policy control network element is also used to Determine the mobility management strategy.

As a possible implementation method, the first policy control network element is configured to send the mobility management policy to the application function network element.

As a possible implementation method, the first policy control network element is configured to receive third indication information from the mobility management network element, where the third indication information is used to indicate that the mobility management policy used by the terminal is based on the application Determining the layer information; and delay determining the mobility management policy according to the third indication information; wherein, the first policy control network element is a policy control network element that provides services for the terminal after the terminal moves.

The system shown in Figure 1(a) can be used in the 5G network architecture shown in Figure 2(a) or Figure 2(b), of course, it can also be used in future network architectures, such as the sixth generation (6th generation, 6G ) network architecture, etc., which are not limited in this application.

In order to accurately determine the AM policy, as shown in Figure 1(b), the present application provides a communication system, which includes a first policy control network element and a mobility management network element, and optionally, a session management network element .

The first policy control network element is configured to send a first request message to the mobility management network element, where the first request message includes event identification information, and the event identification information is used to indicate the state of the session of the detection terminal or the application of the terminal state, the first request message is used to request the event notification corresponding to the event identification information; the first policy control network element receives a notification message from the mobility management network element or the session management network element corresponding to the session, and the notification message Contains the state of the session of the terminal or the state of the application of the terminal, the state of the session of the terminal or the state of the application of the terminal is detected according to the event identification information; according to the state of the session of the terminal or the state of the terminal The state of the application determines the mobility management policy; wherein, the first policy control network element is used to formulate the mobility management policy; the mobility management network element is used to receive the first request message.

As a possible implementation method, the mobility management network element is configured to send the event notification to the first policy control network element after detecting the event corresponding to the event identification information; wherein, the first policy control network element Elements are used to formulate mobility management policies.

As a possible implementation method, when the state of the session is session establishment or the state of the application is application start, the first policy control network element is configured to determine the mobility according to the application layer information from the application function network element management strategy.

As a possible implementation method, the mobility management network element is configured to send the session to the first policy control network element after detecting that the session corresponding to the (DNN, S-NSSAI) combination of the terminal is established The status of the session is session establishment.

As a possible implementation method, the first policy control network element is configured to send the mobility management policy to the application function network element.

As a possible implementation method, the mobility management network element is configured to send a second request message to the session management network element, the second request message includes the event identification information, and the second request message is used to request the event An event notification corresponding to the identification information; receiving a notification message from the session management network element, where the notification message includes the application status of the terminal or the session status of the terminal; and sending the terminal's status to the first policy control network element The state of the application or the state of the session for this endpoint.

As a possible implementation method, the session management network element is configured to receive the second request message from the mobility management network element; detect the session status of the terminal or the application status of the terminal according to the event identification information; And sending the notification message to the mobility management network element or the first policy control network element corresponding to the terminal.

The system shown in Figure 1(b) can be used in the 5G network architecture shown in Figure 2(a) or Figure 2(b). Of course, it can also be used in future network architectures, such as 6G network architectures. This application does not Do limited.

Figure 2(a) is a schematic diagram of a 5G network architecture based on a service-based architecture. The 5G network architecture shown in FIG. 2(a) may include a data network (data network, DN) and an operator network. The functions of some of the network elements are briefly introduced and described below.

Wherein, the operator network may include one or more of the following network elements: an authentication server function (Authentication Server Function, AUSF) network element (not shown in the figure), a unified data management (unifieddata management, UDM) network element, A unified database (Unified Data Repository, UDR), a network storage function (Network Repository Function, NRF) network element (not shown in the figure), a network exposure function (network exposure function, NEF) network element (not shown in the figure), an application Application function (AF) network element, policy control function (policy control function, PCF) network element, AMF network element, session management function (session management function, SMF) network element, user plane function (user plane function, UPF) network element element, a binding support function (binding support funciton, BSF) network element (not shown in the figure), a radio access network (radio access network, RAN) device, and the like. In the above operator network, network elements or devices other than radio access network devices may be referred to as core network elements or core network devices.

The wireless access network equipment can be a base station (base station), an evolved base station (evolved NodeB, eNodeB), a transmission reception point (transmission reception point, TRP), and a next generation base station (next generation NodeB, gNB) in a 5G mobile communication system , a next-generation base station in a 6G mobile communication system, a base station in a future mobile communication system, or an access node in a wireless fidelity (WiFi) system, etc.; it can also be a module or unit that completes some functions of the base station, for example, It can be a centralized unit (central unit, CU) or a distributed unit (distributed unit, DU). The radio access network equipment may be a macro base station, a micro base station or an indoor station, or a relay node or a donor node. The embodiment of the present application does not limit the specific technology and specific equipment form adopted by the radio access network equipment. For ease of description, in the embodiments of the present application, a base station is used as an example of a radio access network device for description.

A terminal communicating with the RAN may also be referred to as terminal equipment, user equipment (user equipment, terminal), mobile station, mobile terminal, and so on. Terminals can be widely used in various scenarios, such as device-to-device (D2D), vehicle-to-everything (V2X) communication, machine-type communication (MTC), Internet of Things (Internet of Things) of things, IOT), virtual reality, augmented reality, industrial control, autonomous driving, telemedicine, smart grid, smart furniture, smart office, smart wear, smart transportation, smart city, etc. Terminals can be mobile phones, tablet computers, computers with wireless transceiver functions, wearable devices, vehicles, drones, helicopters, airplanes, ships, robots, robotic arms, smart home devices, etc. The embodiment of the present application does not limit the specific technology and specific device form adopted by the terminal.

Base stations and terminals can be fixed or mobile. Base stations and terminals can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; they can also be deployed on water; they can also be deployed on aircraft, balloons and artificial satellites in the air. The embodiments of the present application do not limit the application scenarios of the base station and the terminal.

The AMF network element includes functions such as mobility management and access authentication/authorization. In addition, it is also responsible for transferring user policies between the terminal and the PCF.

The SMF network element includes functions such as executing session management, executing control policies delivered by the PCF, selecting UPFs, and assigning Internet Protocol (internet protocol, IP) addresses to terminals.

The UPF network element, as the interface UPF with the data network, includes functions such as user plane data forwarding, session/flow-based charging statistics, and bandwidth limitation.

UDM network element, including the execution management of subscription data, user access authorization and other functions.

UDR, including the access function of execution contract data, policy data, application data and other types of data.

NEF network elements are used to support the opening of capabilities and events.

The AF network element transmits the requirements from the application side to the network side, such as QoS requirements or user status event subscription. The AF may be a third-party functional entity, or an application service deployed by an operator, such as an IP Multimedia Subsystem (IP Multimedia Subsystem, IMS) voice call service.

The PCF network element includes policy control functions such as charging for sessions and service flow levels, QoS bandwidth guarantee, mobility management, and terminal policy decision-making. The PCF network element includes an AM PCF network element and a session management policy control function (session management PCF, SM PCF) network element. The AM PCF network element can provide a mobility management policy, and the SM PCF network element can provide a session management policy.

The NRF network element can be used to provide a network element discovery function, and provide network element information corresponding to the network element type based on the request of other network elements. NRF also provides network element management services, such as network element registration, update, de-registration, network element status subscription and push, etc.

BSF network element can provide functions such as BSF service registration/deregistration/update, connection detection with NRF, creation of session binding information, acquisition of UE information, query of session binding information with duplicate IP addresses, etc.

The AUSF network element is responsible for authenticating users to determine whether users or devices are allowed to access the network.

DN is a network outside the operator's network. The operator's network can access multiple DNs, and various services can be deployed on the DN, which can provide data and/or voice services for terminals. For example, DN is a private network of a smart factory. The sensors installed in the workshop of the smart factory can be terminals, and the control server of the sensors is deployed in the DN, and the control server can provide services for the sensors. The sensor can communicate with the control server, obtain instructions from the control server, and transmit the collected sensor data to the control server according to the instructions. For another example, DN is a company's internal office network. The mobile phone or computer of the company's employees can be a terminal, and the employee's mobile phone or computer can access information and data resources on the company's internal office network.

In Figure 2(a), Npcf, Nufr, Nudm, Naf, Namf, and Nsmf are the service interfaces provided by the above-mentioned PCF, UDR, UDM, AF, AMF, and SMF, respectively, and are used to call corresponding service operations. N1, N2, N3, N4, and N6 are interface serial numbers. The meanings of these interface serial numbers may refer to the meanings defined in the third generation partnership project (3rd generation partnership project, 3GPP) standard agreement, and no limitation is made here.

Figure 2(b) is a schematic diagram of a 5G network architecture based on a point-to-point interface, and the introduction of the functions of the network elements can refer to the introduction of the functions of the corresponding network elements in Figure 2(a), and will not be repeated here. The main difference between Figure 2(b) and Figure 2(a) is that the interface between each control plane network element in Figure 2(a) is a service interface, and each control plane network element in Figure 2(b) The interface between them is a point-to-point interface.

In the architecture shown in Figure 2(b), the interface names and functions between each network element are as follows:

1), N1: the interface between the AMF and the terminal, which can be used to transmit QoS control rules and the like to the terminal.

2), N2: the interface between the AMF and the RAN, which can be used to transfer radio bearer control information from the core network side to the RAN.

3), N3: the interface between the RAN and the UPF, mainly used to transfer the uplink and downlink user plane data between the RAN and the UPF.

4), N4: The interface between SMF and UPF, which can be used to transfer information between the control plane and the user plane, including controlling the distribution of forwarding rules, QoS control rules, traffic statistics rules, etc. Information reporting.

5), N5: the interface between the AF and the PCF, which can be used for sending application service requests and reporting network events.

6), N6: the interface between UPF and DN, used to transfer the uplink and downlink user data flow between UPF and DN.

7), N7: the interface between the PCF and the SMF, which can be used to deliver protocol data unit (protocol data unit, PDU) session granularity and service data flow granularity control policies.

8), N8: The interface between AMF and UDM, which can be used for AMF to obtain subscription data and authentication data related to access and mobility management from UDM, and for AMF to register terminal current mobility management related information with UDM.

9), N9: a user plane interface between UPF and UPF, used to transmit uplink and downlink user data flows between UPFs.

10), N10: the interface between SMF and UDM, which can be used for SMF to obtain session management-related subscription data from UDM, and for SMF to register terminal current session-related information with UDM.

11), N11: the interface between SMF and AMF, which can be used to transfer PDU session tunnel information between RAN and UPF, transfer control messages sent to terminals, transfer radio resource control information sent to RAN, etc.

12), N15: the interface between the PCF and the AMF, which can be used to issue terminal policies and access control-related policies.

13), N35: the interface between UDM and UDR, which can be used for UDM to obtain user subscription data information from UDR.

14), N36: the interface between PCF and UDR, which can be used for PCF to obtain policy-related subscription data and application data-related information from UDR.

It can be understood that the above-mentioned network element or function may be a network element in a hardware device, or a software function running on dedicated hardware, or a virtualization function instantiated on a platform (for example, a cloud platform). Optionally, the foregoing network element or function may be implemented by one device, or jointly implemented by multiple devices, or may be a functional module in one device, which is not specifically limited in this embodiment of the present application.

The data management network element, mobility management network element, session management network element, user plane network element, policy control network element, and application function network element in this application can be the network elements in Figure 2(a) or Figure 2(b) UDR, AMF, SMF, UPF, PCF, and AF may also be network elements that have the functions of UDR, AMF, SMF, UPF, PCF, and AF in future communications such as 6G networks, and this application does not limit this. In the embodiment of this application, UDR, AMF, SMF, UPF, PCF, and AF are respectively referred to as data management network elements, mobility management network elements, session management network elements, user plane network elements, policy control network elements, and application functions An example of a network element is described. And, the PCF includes AM PCF and SM PCF.

In order to accurately determine the AM strategy, one implementation method is that the AM PCF determines the AM strategy according to the application layer information provided by the AF. Referring to FIG. 3 and FIG. 4 , the AM PCF provides methods for determining the AM policy and delivering the AM policy.

FIG. 3 is a schematic flowchart of AM policy generation and use provided by the embodiment of the present application. This embodiment is an example for a single terminal.

In step 301, the terminal registers with the network.

The terminal registers to the network through the AMF, and the AMF interacts with the UDM to obtain the terminal's subscription data from the UDM. The subscription data includes the contracted service area restrictions and the contracted radio access technology (radio access technology, RAT)/spectrum selection priority (RAT/frequency selection priority, RFSP).

Wherein, the service area restriction information is used to indicate the area where the terminal is allowed or not allowed to access, and the RFSP is used for the radio access network device to determine the radio resource management policy.

In step 302, the AMF interacts with the AM PCF to establish an AM policy association.

For example, the AMF sends an Npcf_AMPolicyControl_Create request message to the AM PCF, and the message includes terminal identification information, contracted service area restriction information, and contracted RFSP. Wherein, the identification information of the terminal may be a permanent subscriber identifier (subscription permanent identifier, SUPI) or a generic external subscriber identifier (generic public subscription identifier, GPSI).

The AM PCF determines the AM policy according to the contracted service area restriction information, the contracted RFSP and network policies. Wherein, the AM policy includes authorized service area restriction information and authorized RFSP. Specifically, the AM PCF determines the authorized service area restriction information according to the contracted service area restriction information and network policy, and determines the authorized RFSP according to the contracted RFSP and network policy.

Then the AM PCF sends the Npcf_AMPolicyControl_Create response message to the AMF, which contains the AM policy.

In step 303, the AM PCF sends a registration request message to the BSF. Correspondingly, the BSF receives the registration request message.

The registration request message includes binding information of the AM PCF, and the binding information includes the identification of the AMF PCF and the identification information of the terminal. Wherein, the identifier of the AMF PCF may be a resource identifier of the AM PCF supporting the Npcf_AmPolicyAuthorization service.

Optionally, the registration request message may be an Nbsf_Menagement_Register Request message.

In step 304, the AF sends a subscription request message to the BSF. Correspondingly, the BSF receives the subscription request message.

The subscription request message includes the identification information of the terminal, and the subscription request message is used to subscribe to the registration information of the AM PCF that provides the AM policy for the terminal.

Optionally, the subscription request message may be an Nbsf_Management_Subscribe Request message.

Optionally, step 304 may be performed before step 301.

In step 305, the BSF sends a notification message to the AF, and the AF receives the notification message accordingly.

The notification message includes registration information corresponding to the identification information of the terminal, and the registration information includes the identification of the AM PCF.

Optionally, the notification message may be a Nbsf_Management_Notify Request message.

In step 306, the AF sends an AM policy authorization request message to the AM PCF, and accordingly, the AM PCF receives the AM policy authorization request message.

Optionally, the AM policy authorization request message may be an Npcf_AMPolicyAuthorization_CreateRequest message.

The AM policy authorization request message contains application layer information, where the application layer information includes any one of the following information 1 to information 4:

Information 1: terminal identification information, service area coverage (service area coverage) and associated (DNN, S-NSSAI) combination;

Information 2: terminal identification information, high throughput indication and associated (DNN, S-NSSAI) combination;

Information 3: terminal identification information, service area coverage, associated (DNN, S-NSSAI) combination, and at least one application identification (Application Id);

Information 4: identification information of the terminal, a high throughput indication, an associated (DNN, S-NSSAI) combination, and an identification of at least one application.

Wherein, the (DNN, S-NSSAI) combination of the above information 3 is optional information, and the (DNN, S-NSSAI) combination of the above information 4 is also optional information.

Among them, DNN is the abbreviation of data network name, and the Chinese name is the name of the data network. S-NSSAI is the detection of single network slice selection assistance information, and the Chinese name is single network slice selection assistance information.

Wherein, the coverage of the service area refers to the information provided by the AF of the area that requires policy control. The high throughput indication may be indication information for indicating high throughput.

Optionally, the AF may also subscribe to the AM PCF for service area coverage change events or AM policy change events through the AM policy authorization request message, for example, the AM policy authorization request message carries the identification and notification of the service area coverage change event Endpoint, or an endpoint that carries the ID and notification of an AM policy change event. The notification endpoint may be the address of the AF.

Optionally, the AM PCF may also send an AM policy authorization response message to the AF after storing the received above information. Optionally, the AM policy authorization response message may be an Npcf_AMPolicyAuthorization_Createresponse message.

In step 307, the AM PCF sends a subscription request message to the BSF. Correspondingly, the BSF receives the subscription request message.

The subscription request message is used to subscribe to the binding information of the SM PCF, and the subscription request message carries the identification information of the terminal and the combination of (DNN, S-NSSAI).

Optionally, the subscription request message may be an Nbsf_Management_Subscribe Request message.

In step 308, the terminal establishes a PDU session, and the session corresponds to the (DNN, S-NSSAI) combination.

When the terminal establishes a PDU session, the SMF assigns the address of the terminal to the PDU session. SMF interacts with SM PCF to establish SM policy association. For example, the SMF sends the Npcf_SMPolicyControl_Create request message to the SM PCF, and the message includes the identification information of the terminal and the address of the terminal. After the SM PCF receives the message, if there is no subscription data of the terminal in the SM PCF, the SM PCF can interact with the UDR to obtain the subscription data of the terminal. Then the SM PCF determines the SM strategy according to the subscription data of the terminal and the network strategy. The SM PCF sends the Npcf_SMPolicyControl_Createresponse message to the SMF, and the message carries the SM policy.

In step 309, the SM PCF sends a registration request message to the BSF, and the BSF receives the registration request message accordingly.

The registration request message contains binding information of the SM PCF, the binding information includes the address of the terminal, the identification information of the terminal, the combination of (DNN, S-NSSAI) and the identification of the SM PCF, and the identification of the SM PCF may be the SMPCF supports the resource identification of Npcf_PolicyAuthorization service.

Optionally, the registration request message may be an Nbsf_Menagement_Register Request message.

In step 310, the BSF sends the binding information of the SM PCF to the AM PCF according to the subscription of the AM PCF.

Optionally, the BSF sends a Nbsf_Management_Notify Request message to the AM PCF, and the message includes binding information of the SM PCF.

In step 311, the AM PCF sends a subscription request message to the SM PCF, and the SM PCF receives the subscription request message accordingly.

This step 311 is an optional step. Specifically, in the case that the policy authorization request message in step 306 includes at least one application identifier, that is, the policy authorization request message in step 306 includes the above information 3 or information 4, then step 311 is executed. The subscription request message includes at least one application identifier for subscribing to application start/stop events.

Optionally, the subscription request message may be an Npcf_PolicyAuthorization_Subscribe Request message.

In step 312, the SM PCF detects an application start/stop event.

For example, the SM PCF interacts with the SMF to request detection of application start/stop events, and then the SMF further interacts with the UPF to request the UPF to detect application start/stop events.

This step 312 is an optional step. In the case that the above step 311 is performed, then step 312 is performed.

Step 313, when the SM PCF receives the application start event report from the SMF, the SM PCF sends a notification message to the AM PCF, and the AM PCF receives the notification message accordingly.

The notification message includes an application identifier and an application start event.

Optionally, the notification message may be an Npcf_PolicyAuthorization_Notify Request message.

Step 314, the AM PCF updates the AM policy.

In an implementation method, if the above-mentioned information 1 or information 2 is carried in the AM policy authorization request message in the above-mentioned step 306, the AM PCF determines that the PDU session has been established after receiving the binding information of the SM PCF in the above-mentioned step 310, Then the AM PCF determines to update the AM policy. Wherein, the AM PCF receives the binding information of the SM PCF, indicating that the SM PCF has been selected, and the SM PCF is selected on the premise that the PDU session has been established.

In another implementation method, if the above information 3 or information 4 is carried in the AM policy authorization request message in the above step 306, the AM PCF determines that the PDU session has been established after receiving the application start event in the above step 313, and the AMPCF Make sure to update the AM policy. Wherein, the AM PCF receives the application start event, indicating that the application has started, and the premise of the application start is that the PDU session has been established.

Wherein, the AM PCF updates the AM policy, specifically: the AM PCF updates the authorized service area restriction information in the above step 302 according to the received service area coverage, obtains the updated service area restriction information, and according to the received high throughput The amount indicates to update the authorized RFSP in the above step 302, and obtain the updated RFSP. The updated AM policy contains updated service area restriction information and updated RFSP.

In step 315, the AM PCF sends the updated AM policy to the AMF. Correspondingly, the AMF receives the updated AM policy.

Wherein, the updated AM policy includes updated service area restriction information and updated RFSP.

Optionally, the AMF may send an Npcf_AmPolicyControl_UpdateNotify request message to the AMF, which includes updated service area restriction information and updated RFSP.

In step 316, the AMF executes the updated AM policy.

That is, the AMF controls the terminal according to the updated AM policy.

In step 317, the AMF sends a notification message to the terminal, and the notification message includes the updated service area restriction information.

The terminal determines the accessible area according to the updated service area restriction information.

In step 318, the AMF sends a notification message to the base station, and the notification message includes the updated service area restriction information and the updated RFSP.

The base station controls terminal access according to the updated service area restriction information, and determines a radio resource management strategy according to the updated RFSP.

In step 319, the AM PCF sends the event notification and the updated AM policy to the AF.

This step is optional. Specifically, if the AF subscribes to the service area coverage change event or the AM policy change event in step 306 above, step 319 is executed.

Optionally, the AM PCF may send the event notification and the updated AM policy to the AF through the Npcf_AMPolicyAuthorization_Notify message.

Through the above solution, the AM PCF can update the AM policy according to the application layer information provided by the AF, so that an accurate AM policy can be obtained, which is beneficial to implement precise control on the terminal according to the accurate AM policy.

FIG. 4 is a schematic flowchart of AM policy generation and use provided by the embodiment of the present application. This embodiment is an example for a terminal group or an arbitrary terminal.

Step 401 to step 402 are the same as step 301 to step 302.

In step 403, the AM PCF sends a subscription request message to the UDR, and the UDR receives the subscription request message accordingly.

The subscription request message includes the (S-NSSAI, DNN) combination and the external group identifier. The subscription request message is used for subscribing to application data related to AM, or understood as subscribing to AM influence information (AM influence information).

Wherein, the AM impact information may also be referred to as application layer information.

Optionally, the subscription request message may be a Nudr_DM_Subscribe request message.

In step 404, the AF sends AM impact information to the UDR. Accordingly, the UDR receives AM impact information.

For example, the AF can send AM influence information to the UDR through the NEF. The specific AF sends a Nnef_AMInfluence_Create request message to the NEF, which carries the AM influence information, and then the NEF sends a Nudr_DM_Create Request message to the UDR, which carries the AM influence information. Optionally, UDR sends Nudr_DM_Create Response message to NEF, and then NEF sends Nnef_AMInfluence_Create Response message to AF.

Among them, the AM impact information includes any one of the following information 1 to information 4:

Information 1: external group identifier or any terminal indication, service area coverage (service area coverage) and associated (DNN, S-NSSAI) combination;

Information 2: external group identifier or any terminal indication, high throughput (high throughput) indication and associated (DNN, S-NSSAI) combination;

Information 3: external group identifier or any terminal indication, service area coverage, associated (DNN, S-NSSAI) combination and at least one application identifier (Application Id);

Information 4: external group identification or any terminal indication, high throughput indication, associated (DNN, S-NSSAI) combination and identification of at least one application.

Wherein, the (DNN, S-NSSAI) combination of the above information 3 is optional information, and the (DNN, S-NSSAI) combination of the above information 4 is also optional information.

For the meanings of the coverage of the service area and the high throughput indication, reference may be made to the description in step 306 .

Optionally, in this step, the AF may also subscribe to the service area coverage change event or the AM policy change event to the UDR through the NEF, for example, the AM impact information also carries the service area coverage change event identifier and notification endpoint, or carries Identification and notification endpoint for AM policy change events. The notification endpoint may be the address of the AF.

Optionally, this step 404 may be performed before the foregoing step 401 .

Step 405, the UDR sends a notification message to the AM PCF. Correspondingly, the AM PCF receives the notification message.

The notification message includes AM impact information.

Optionally, the notification message may be a Nudr_DM_Notify request message.

In step 406, the AM PCF sends a subscription request message to the BSF. Correspondingly, the BSF receives the subscription request message.

The subscription request message includes terminal identification information and (DNN, S-NSSAI) combination, and the subscription request message is used for subscribing SM PCF binding information.

Wherein, the terminal indicated by the identification information of the terminal in the subscription request message is the terminal in step 401 above. Specifically, the AM PCF judges that the received AM influence information applies to the terminal in step 401, and then determines that the subscription request message carries the identification information of the terminal.

Step 407 to step 409 are the same as step 308 to step 310.

In step 410, the AM PCF sends a subscription request message to the SM PCF, and the SM PCF receives the subscription request message accordingly.

This step 410 is an optional step. Specifically, in the case that the notification message in step 405 includes at least one application identifier, that is, the notification message in step 405 includes the above information 3 or information 4, step 410 is executed. The subscription request message includes at least one application identifier for subscribing to application start/stop events.

Optionally, the subscription request message may be an Npcf_PolicyAuthorization_Subscribe Request message.

Step 411 to step 412 are the same as step 312 to step 313.

Step 413, the AM PCF updates the AM policy.

In one implementation method, if the above-mentioned information 1 or information 2 is carried in the notification message of the above-mentioned step 405, then the AMPCF determines that the PDU session has been established after receiving the binding information of the SM PCF in the above-mentioned step 409, and then the AM PCF determines that Update the AM policy. Wherein, the AM PCF receives the binding information of the SM PCF, indicating that the SM PCF has been selected, and the SM PCF is selected on the premise that the PDU session has been established.

In another implementation method, if the above-mentioned information 3 or information 4 is carried in the notification message of the above-mentioned step 405, the AM PCF determines that the PDU session has been established after receiving the application start event in the above-mentioned step 412, and then the AM PCF determines to update AM strategy. Wherein, the AM PCF receives the application start event, indicating that the application has started, and the premise of the application start is that the PDU session has been established.

Wherein, the AM PCF updates the AM policy, specifically: the AM PCF updates the authorized service area restriction information in the above step 402 according to the received service area coverage, obtains the updated service area restriction information, and according to the received high throughput The amount indicates to update the authorized RFSP in the above step 402, and obtain the updated RFSP.

In the embodiment of the present application, the AM policy is also referred to as a mobility management policy, which is described in a unified manner here and will not be described in detail later.

Step 414 to step 417 are the same as step 315 to step 318.

In step 418, the AM PCF sends the event notification and the updated AM policy to the AF.

This step is optional. For example, if the AF subscribes to the service area coverage change event or the AM policy change event in step 405 above, step 418 is executed.

Optionally, AM PCF can send event notification and updated AM policy to NEF through Npcf_AMPolicyAuthorization_Notify message, and then NEF sends event notification and updated AM policy to AF through Nnef_AMInfluence_Notify message.

Through the above solution, the AM PCF can update the AM policy according to the application layer information provided by the AF, so that an accurate AM policy can be obtained, which is beneficial to implement precise control on the terminal according to the accurate AM policy.

Currently, each BSF will register its own information to the NRF so that other network elements can discover itself. When BSF registers information, it usually uses the IP address range of the terminal it serves as an index, so that other network elements can obtain the BSF corresponding to the IP address of the terminal from the NRF according to the IP address of the terminal.

In the process shown in FIG. 3 or FIG. 4, in order to find the corresponding SM PCF, the AM PCF sends a subscription request message to the BSF to request to subscribe to the binding information of the SM PCF.

However, in the process shown in FIG. 3 or FIG. 4, the AM PCF cannot obtain the IP address of the terminal, so the AM PCF cannot obtain the BSF corresponding to the IP address of the terminal from the NRF according to the IP address of the terminal. Therefore, when there are multiple distributed BSFs in the network, the AM PCF needs to send a subscription request message to each BSF, which will increase signaling overhead and waste resources.

In order to accurately determine the mobility management policy and reduce signaling overhead and resource waste in the process of determining the mobility management policy, an embodiment of the present application provides a communication method, as shown in FIG. 5( a ). In this method, the first PCF is used to formulate a mobility management policy, and the first PCF may also be called an AM PCF, and the second PCF is used to formulate a session management policy, and the second PCF may also be called an SM PCF. In the scenario where the terminal moves, the first PCF refers to the AM PCF that provides services for the terminal after the terminal moves. Therefore, in this method, the first PCF may represent the AM PCF that provides services for the terminal in a scenario where the terminal does not move, or the AM PCF that provides services for the terminal after the terminal moves in a scenario where the terminal moves.

The method includes the following steps:

Step 501a, the first PCF sends a request message to the UDR, and the UDR receives the request message accordingly.

The request message includes terminal identification information, event identification information and notification address. The request message is used to request the UDR to save the event identification information and the notification address, or it can be understood that the request message is used to request the UDR to save the event identification information and the notification address to the information associated with the identification information of the terminal, for example, to the In the subscription data of the terminal indicated by the identification information of the terminal. Optionally, the UDR also stores the identification information of the terminal.

As an implementation method, the event identification information and notification address may be collectively referred to as event subscription information, or the request message may include terminal identification information and event subscription information, and the event subscription information may include event identification information and notification address.

As an implementation method, the request message may also include a notification correlation ID (notification correlation Id), which is used to distinguish event ID information and notification addresses of different terminals.

In an implementation method, the request message includes a uniform resource identifier (uniform resource identifier, URI), and the URI includes identification information of the terminal. Exemplarily, the URI in the request message is {apiRoot}/nudr-dr/<apiVersion>/policy-data/ues/{ueId}/sm-data, and the identification information of the terminal is the ueId in the URI.

The identification information of the terminal is information for identifying the terminal, and the identification information of the terminal may be SUPI, GPSI, or a group identification of a group to which the terminal belongs.

The event identification information is used to indicate the state of the detection session or the state of the application. For example, when the event identification information is used to indicate the status of the detection session, the event identification information may be the status of the PDU session (PDU Session Status) or the establishment/termination of the PDU session (PDU Session establishment/termination). For another example, when the event identification information is used to indicate the state of the detected application, the state of the application (application status) may be application detection (application detection) or application start/stop (application start/stop).

Exemplarily, when the event identification information is used to indicate the status of the detected application, the request message may further include an identification of at least one application, and in this case, the event identification information is used to indicate the detected status of the at least one application.

A notification address (notification address) is used for receiving an event notification address corresponding to the event identification information, and the event notification address is an address of the first PCF. The notification address here may also be called a notification target address (notification target address).

In step 502a, the UDR sends the event identification information and notification address to the second PCF, and correspondingly, the second PCF receives the event identification information and the notification address.

If the event identification information in step 501a is used to indicate the state of the detected application, the above request message also includes the identification of at least one application, so in step 502a, the UDR also sends the identification information of the at least one application to the second PCF.

As an implementation method, when the request message in step 501a includes the notification association identifier, in step 502a, the UDR also sends the notification association identifier to the second PCF.

As an implementation method, the second PCF sends a query request message to the UDR, the query request message contains the identification information of the terminal, and the query request message is used to query the subscription data of the terminal. Obtain the subscription data of the terminal from the saved information, the subscription data of the terminal includes the event identification information and notification address in step 501a above, and then the UDR sends a query response message to the second PCF, the query response message includes the subscription data of the terminal , the subscription data includes the above-mentioned event identification information and notification address. Based on this method, the UDR sends the event identification information and notification address to the second PCF in real time based on the query request of the second PCF, which helps the second PCF to obtain the event identification information and notification address in time.

As another implementation method, the second PCF sends a subscription data subscription request message to the UDR, the subscription data subscription request message includes the identification information of the terminal, and the subscription data subscription request message is used to request to query the notification of the subscription data change of the terminal, Then the UDR subscribes to the request message according to the subscription data. Once the subscription data of the terminal stored in the UDR is found to be changed, the UDR sends a notification message to the second PCF. The notification message includes the changed subscription data of the terminal. The subscription data contains Event identification information and notification address. For example, the second PCF sends the subscription data subscription request message to the UDR before the above step 501a. When the UDR receives the above request message from the first PCF in the above step 501a, it triggers the UDR to The subscription data of the terminal stored in the UDR is updated, and then the UDR is triggered to send the foregoing notification message to the second PCF. Based on this method, the UDR sends the event identification information and notification address to the second PCF based on the subscription data subscription request message of the second PCF. This method does not require the second PCF to frequently send queries to the UDR for requesting the subscription data of the terminal. request message, thus reducing signaling overhead.

Step 503a, the second PCF detects the session state of the terminal or the application state of the terminal according to the event identification information.

For example, the event identification information is used to indicate the state of the detection session, and the second PCF detects the state of the session of the terminal. Wherein, the detected state of the session may be PDU session establishment or PDU session termination.

For another example, the event identification information is used to indicate the state of the application to be detected, and the second PCF detects the state of the application of the terminal. Specifically, the second PCF detects the application indicated by the at least one application identification carried in the request message in step 501a status. Wherein, the detected application state may be application start or application stop.

In step 504a, the second PCF sends a notification message to the first PCF according to the notification address, and correspondingly, the first PCF receives the notification message.

The notification message includes the session state of the terminal or the application state of the terminal.

As an implementation method, when the UDR also sends the notification association identifier to the second PCF in step 502a above, the notification message may also carry the notification association identifier.

As an implementation method, the notification message may further include at least one of a session identifier of the terminal, an address of the terminal, or an identifier of the second PCF.

Step 505a, the first PCF determines the mobility management policy according to the state of the session of the terminal or the state of the application of the terminal.

For example, when the first PCF receives the session status of the terminal, and the session status of the terminal is session establishment, the first PCF determines the mobility management policy according to the application layer information from the AF.

For another example, when the first PCF receives the session status of the terminal, and the session status of the terminal is terminated, the first PCF does not determine the mobility management policy based on the application layer information from the AF. The subscription data determines the mobility management strategy.

For another example, when the first PCF receives the application status of the terminal, and the application status of the terminal is application start, the first PCF determines the mobility management policy according to the application layer information from the AF.

For another example, when the first PCF receives the application status of the terminal, and the application status of the terminal is application stopped, the first PCF does not determine the mobility management policy based on the application layer information from the AF. The subscription data determines the mobility management strategy.

Wherein, the specific implementation method for the first PCF to determine the mobility management policy according to the application layer information from the AF can refer to the description of the foregoing step 314 or step 413 .

According to the above method from step 501a to step 505a, the first PCF can determine the mobility management strategy according to the session state or application state of the terminal, and can accurately determine the mobility management strategy. Moreover, compared with the method in FIG. 3 or FIG. 4, the method in FIG. 5(a) does not require the first PCF to send a subscription request message to each BSF in the network, but only needs to send a request message to a UDR, Then the state of the session or the state of the application of the terminal can be received, so the signaling overhead and waste of resources in the process of determining the mobility management policy can be reduced.

As an implementation method, the event identification information in the above step 501a may be determined by the first PCF according to the application layer information from the AF, that is, before step 501a, the first PCF receives the application layer information from the AF, and then the first PCF The event identification information is determined according to the application layer information. For example, when the application layer information sent by the AF to the first PCF is for a single terminal, the application layer information may be any one of information 1 to information 4 described in step 306 above. Optionally, when the application layer information is the information 1 or information 2 described in step 306 above, the event identification information is used to indicate the status of the detection session; when the application layer information is information 3 or information 2 described in step 306 above 4. The event identification information is used to indicate the status of the detection application. For another example, when the application layer information sent by the AF to the first PCF is for any terminal or terminal group, the application layer information may be any one of information 1 to information 4 described in step 404 above. Optionally, when the application layer information is information 1 or information 2 described in step 404 above, the event identification information is used to indicate the status of the detection session, when the application layer information is information 3 or information 2 described in step 404 above 4. The event identification information is used to indicate the status of the detection application.

As an implementation method, when the first PCF receives the application layer information from the AF before the above step 501a, the request message in the above step 501a may also include (DNN, S-NSSAI) combination, the (DNN, S- NSSAI) combines the application layer information from the AF, and the request message is used to request the UDR to save the event identification information and notification address in the subscription data corresponding to the (DNN, S-NSSAI) combination of the terminal. In the case that the request message in the above step 501a contains a (DNN, S-NSSAI) combination, then in the above step 502a, what the UDR sends to the second PCF is the event identification information corresponding to the (DNN, S-NSSAI) combination and notification address, it can also be understood that the second PCF corresponds to the (DNN, S-NSSAI) combination. Therefore, the query request message sent by the second PCF to the UDR in the above step 502a may include the (DNN, S-NSSAI) combination, and the query request message is used to request the subscription corresponding to the (DNN, S-NSSAI) combination of the query terminal. data, or the subscription data subscription request message sent by the second PCF to the UDR in step 502a above may include the (DNN, S-NSSAI) combination, and the subscription data subscription request is used to request the combination of the terminal and (DNN, S-NSSAI) Notification of corresponding subscription data changes. Based on this method, the refined management of event identification information based on (DNN, S-NSSAI) combination can be realized.

As an implementation method, in the case that the request message in step 501a includes a combination of (DNN, S-NSSAI), the request message may also include first indication information, where the first indication information is used to indicate the notification policy, The notification policy is: sending a notification message when the first session corresponding to the (DNN, S-NSSAI) combination is established, and/or sending a notification message when the last session corresponding to the (DNN, S-NSSAI) combination is terminated. The UDR will also store the first indication information. Subsequently, when the UDR sends the event identification information and notification address to the second PCF in the above step 502a, it will also send the first indication information to the second PCF. According to the first indication information, when the second PCF detects the status of the first session among the multiple sessions, it sends a notification message containing the status of the first session to the first PCF, and/or when multiple sessions are detected The state of the last session in the session sends a notification message containing the state of the last session to the first PCF, and for the states of other sessions except the first session and the last session, the second PCF does not need to send a notification message to the first PCF The first PCF sends the status of this other session. According to this method, signaling overhead can be reduced.

As an implementation method, the mobility management policy determined in step 505a includes second indication information, where the second indication information is used to indicate that the mobility management policy is determined according to the application layer information. Subsequently, the mobility management policy can be sent to the AMF, base station and terminal, so that the AMF, base station and terminal can know that the mobility management policy is determined according to the application layer information, which helps to realize the rational use of the mobility management policy.

As an implementation method, after the above step 505a, the first PCF may send the mobility management policy to the AF. For example, the first PCF sends the mobility management policy to the AF based on the subscription of the AF, or the first PCF actively sends the mobility management policy to the AF.

As an implementation method, after the above step 505a, the UDR may also send a response message to the first PCF to the above request message, the response message includes the first identification information, the first identification information is the event identification information and notification address The first identification information is used to modify or delete the event identification information and/or notification address. That is, the subsequent first PCF or other PCFs may modify or delete the event identification information and/or notification address stored in the UDR by the first PCF according to the first identification information. According to the method, the quick modification or deletion of the event identification information and the notification address stored in the UDR can be realized.

As an implementation method, when the first PCF is an AM PCF that provides services for the terminal after the terminal moves, before the above step 501a, the first PCF may receive third indication information from the AMF, and the third indication information is used It is used to indicate that the mobility management policy used by the terminal is determined according to the application layer information, so that the first PCF delays determining the mobility management policy according to the third indication information, or it is understood that the first PCF determines not to use the mobility management policy based on the third indication information. The subscription data determines the mobility management strategy. Then, the first PCF triggers the execution of the above step 501a to step 505a according to the third indication information, so as to determine the mobility management policy according to the application layer information. This method helps to realize precise determination of mobility management strategy.

In order to accurately determine the mobility management policy and reduce signaling overhead and resource waste in the process of determining the mobility management policy, an embodiment of the present application provides a communication method, as shown in FIG. 5( b ). This method is applicable to the scenario where the terminal moves. In this method, the first PCF and the third PCF are used to formulate a mobility management strategy. Both the first PCF and the third PCF can be called AM PCFs. The first PCF is the PCF that provides services for the terminal after the terminal moves, and the third PCF It is the PCF that provides services for the terminal before the terminal moves. The second PCF is used to formulate a session management policy, and the second PCF may be called an SM PCF.

The method includes the following steps:

In step 501b, the first PCF sends a request message to the UDR, and the UDR receives the request message accordingly.

The request message includes first identification information and a first notification address.

Wherein, the first notification address is an event notification address corresponding to receiving event identification information, and the event notification address is an address of the first PCF.

The first identification information is the event identification information stored in the UDR and the identification information of the second notification address. The event identification information is used to indicate the state of the detection session or the application state. For the specific meaning of the event identification information, refer to the description in step 501a. The second notification address is an address of the third PCF for receiving the event notification corresponding to the event identification information.

Exemplarily, the method for the first PCF to obtain the first identification information may be, for example: after the third PCF saves the event identification information and the second notification address to the UDR, the UDR generating the first identification information, and then sending the first identification information to a third PCF, and then the third PCF sending the first identification information to the first AMF that previously provided services for the terminal, and then the first AMF sends the The first identification information is sent to the second AMF that provides services for the terminal after the terminal, so that the second AMF can send the first identification information to the first PCF.

The request message is used to request the UDR to update the saved second notification address to the first notification address.

As an implementation method, the request message may also include a first notification association identifier assigned by the first PCF, and the first notification association identifier is used to distinguish event identification information and notification addresses of different terminals, and the request message may also include It is used to request the UDR to update the saved second notification association identifier to the first notification association identifier, and the second notification association identifier is sent together by the third PCF when saving the event identification information and the second notification address to the UDR Saved to UDR.

In step 502b, the UDR updates the saved second notification address to the first notification address.

Exemplarily, before step 501b, the UDR receives the event identification information and the second notification address from the third PCF, and then the UDR saves the event identification information and the second notification address. Then, after receiving the request message, the UDR updates the saved second notification address to the first notification address, so that after the update, the UDR saves the event identification information and the first notification address.

As an implementation method, the UDR also updates the saved second notification association identifier to the first notification association identifier.

In step 503b, the UDR sends the event identification information and the first notification address to the second PCF, and correspondingly, the second PCF receives the event identification information and the first notification address.

As an implementation method, in the step 503b, the UDR also sends the first notification association identifier to the second PCF.

The specific implementation of this step 503b is similar to the above step 502a, and reference may be made to the above description.

In step 504b, the second PCF detects the session state of the terminal or the application state of the terminal according to the event identification information.

The specific implementation of this step 504b is the same as the above step 503a, and reference may be made to the foregoing description.

In step 505b, the second PCF sends a notification message to the first PCF according to the first notification address, and correspondingly, the first PCF receives the notification message.

As an implementation method, the notification message further includes the first notification association identifier.

The notification message includes the session state of the terminal or the application state of the terminal.

Step 506b, the first PCF determines the mobility management policy according to the state of the session of the terminal or the state of the application of the terminal.

The specific implementation of this step 506b is the same as that of the above step 505a, and reference may be made to the foregoing description.

According to the above method from step 501b to step 506b, the first PCF can determine the mobility management strategy according to the session state or application state of the terminal, and can accurately determine the mobility management strategy. Moreover, compared with the method in FIG. 3 or FIG. 4, the method in FIG. 5(b) does not require the first PCF to send a subscription request message to each BSF in the network, but only needs to send a request message to a UDR, Then the state of the session or the state of the application of the terminal can be received, so the signaling overhead and waste of resources in the process of determining the mobility management policy can be reduced. In addition, compared with the method in Figure 5(a), the first PCF in the method in Figure 5(b) can modify the notification address stored in the UDR according to the first identification information, which can reduce the signaling load and help save resources.

Various other possible implementation methods based on the embodiment of Figure 5(b), such as the implementation method based on (DNN, S-NSSAI) combination, the implementation method based on application layer information, and the implementation based on the above-mentioned first indication information The method, the implementation method based on the above-mentioned second indication information, the implementation method based on the above-mentioned third indication information, etc., are all similar to the various implementation methods in the embodiment of Figure 5(a) above, and you can refer to the foregoing description, and will not repeat them here. .

In order to accurately determine the mobility management policy and reduce signaling overhead and resource waste in the process of determining the mobility management policy, this embodiment of the present application provides another communication method, as shown in FIG. 5( c ). In this method, the first PCF is used to formulate a mobility management policy, and the first PCF may also be called an AM PCF, and the second PCF is used to formulate a session management policy, and the second PCF may also be called an SM PCF.

The method includes the following steps:

In step 501c, the first PCF sends a first request message to the AMF, and correspondingly, the AMF receives the first request message.

The first request message includes event identification information, the event identification information is used to indicate the state of the session of the detection terminal or the state of the application of the terminal, and the event corresponding to the event identification information is the state of the session of the terminal or the state of the application of the terminal , the specific implementation of the event identification information can refer to the description in step 501a.

The first request message is used to request event notification corresponding to the event identification information.

Exemplarily, the first PCF may send the first request message to the AMF on the session of the terminal, so that the AMF may know which terminal's session state or application state is to be detected.

Optionally, the event identification information in the first request message may be determined by the first PCF according to the application layer information from the AF. For a specific method for the first PCF to determine the event identification information according to the application layer information from the AF, reference may be made to the related description in the embodiment of FIG. 5( a ).

Optionally, the first request message further includes a (DNN, S-NSSAI) combination, and the first request message is used to request a session state or an application state of the terminal corresponding to the (DNN, S-NSSAI) combination. The (DNN, S-NSSAI) combination acquired by the first PCF may come from the application layer information of the AF. Wherein, for the specific description of the application layer information, reference may be made to the description of the aforementioned step 306 or step 404 .

In step 502c, the AMF detects the event corresponding to the event identification information.

The following introduces two different implementation methods for the event corresponding to the event identification information detected by the AMF.

Implementation method 1, when the event identification information is the state of the session, the AMF detects the state of the session of the terminal.

According to the first implementation method, the AMF detects the session status of the terminal.

Optionally, if the above-mentioned first request message also includes a (DNN, S-NSSAI) combination, the first request message is used to request the session status of the terminal corresponding to the (DNN, S-NSSAI) combination or the state, so that the AMF can detect the state of the session corresponding to the (DNN, S-NSSAI) combination of the terminal. The state of the session includes the establishment of the session corresponding to the (DNN, S-NSSAI) combination or the termination of the session corresponding to the (DNN, S-NSSAI) combination. Alternatively, the state of the session is the establishment of the first session corresponding to the (DNN, S-NSSAI) combination, or the termination of the last session corresponding to the (DNN, S-NSSAI) combination.

In the second implementation method, when the event identification information is the state of the application or the state of the session, the SMF detects the state of the session of the terminal.

For example, after the above step 501c, the AMF sends a second request message to the SMF, the second request message includes the above event identification information, and the second request message is used to request event notification corresponding to the event identification information. Then, the SMF detects the event corresponding to the event identification information, and after detecting the event corresponding to the event identification information, the SMF sends a notification message to the AMF, and the notification message includes the state of the application of the terminal or the state of the session of the terminal. When the AMF receives the notification message, it indicates that the AMF has detected the event corresponding to the event identification information. Therefore, according to the second implementation method, when the AMF detects the event corresponding to the event identification information, it can be understood that the AMF receives the notification message from the SMF.

In step 503c, the AMF sends a notification message to the first PCF. Correspondingly, the first PCF receives the notification message.

The notification message includes the session state of the terminal or the application state of the terminal, and the session state of the terminal or the application state of the terminal is detected according to the event identification information.

If the AMF detects the event corresponding to the event identification information according to the first implementation method of step 502c, the notification message includes the session status of the terminal, and the session status is session establishment.

If the AMF detects the event corresponding to the event identification information according to the second implementation method of step 502c, the notification message includes the notification message from the SMF, and the notification message includes the session state of the terminal or the application state of the terminal.

Step 504c, the first PCF determines the mobility management policy according to the state of the session of the terminal or the state of the application of the terminal.

The specific implementation of this step 504c is the same as the above step 505a, and reference may be made to the foregoing description.

According to the above method from step 501c to step 504c, the first PCF can determine the mobility management strategy according to the session state or application state of the terminal, and can accurately determine the mobility management strategy. Moreover, compared with the method in FIG. 3 or FIG. 4, the method in FIG. 5(c) does not require the first PCF to send a subscription request message to each BSF in the network, but only needs to send a request message to one AMF, Then the state of the session or the state of the application of the terminal can be received, so the signaling overhead and waste of resources in the process of determining the mobility management policy can be reduced.

As an implementation method, the above step 502c and step 503c may not be performed, but the following operations are performed after step 501c and before step 504c: AMF sends a second request message to SMF after receiving the first request message, the The second request message includes the event identification information, and the second request message is used to request event notification corresponding to the event identification information. Then, the SMF detects the event corresponding to the event identification information, and after detecting the event corresponding to the event identification information, the SMF sends a notification message to the first PCF, and the notification message includes the application state of the terminal or the session state of the terminal.

As an implementation method, if the combination of (DNN, S-NSSAI) is contained in the above first request message, the first request message may also contain the first indication information, or the above first request message and the second In the case that both the request messages include the (DNN, S-NSSAI) combination, both the first request message and the second request message may also include the first indication information. The first indication information is used to indicate a notification strategy, and the notification strategy is: when the first session corresponding to the (DNN, S-NSSAI) combination is established, a notification message is sent, and/or when the (DNN, S-NSSAI) combination A notification message is sent when the corresponding last session terminates. Then the AMF or SMF sends a notification message containing the state of the first session to the first PCF when detecting the state of the first session among the multiple sessions according to the first indication information, and/or when multiple sessions are detected The state of the last session in the session sends a notification message containing the state of the last session to the first PCF, and for the states of other sessions except the first session and the last session, AMF or SMF does not need to send a notification message to the first PCF The first PCF sends the status of this other session. According to this method, signaling overhead can be reduced.

As an implementation method, the mobility management policy determined in step 504c includes second indication information, where the second indication information is used to indicate that the mobility management policy is determined according to application layer information. Subsequently, the mobility management policy can be sent to the AMF, base station and terminal, so that the AMF, base station and terminal can know that the mobility management policy is determined according to the application layer information, which helps to realize the rational use of the mobility management policy.

As an implementation method, after the above step 504c, the first PCF may send the mobility management policy to the AF. For example, the first PCF sends the mobility management policy to the AF based on the subscription of the AF, or the first PCF actively sends the mobility management policy to the AF.

The solutions shown in FIG. 5( a ), FIG. 5( b ) and FIG. 5( c ) will be described below in conjunction with specific examples. Among them, the examples shown in Figure 6 and Figure 7 below are specific examples of the solution shown in Figure 5(a) above, and the examples shown in Figure 8 and Figure 9 below are specific examples of the solution shown in Figure 5(b) above As an example, the example shown in FIG. 10 and FIG. 10( a ) below is a specific example of the solution shown in FIG. 5( c ).

FIG. 6 shows a communication method provided by an embodiment of the present application. In this method, the AF provides application layer information for a single terminal for AM policy decision-making, and the AM PCF obtains the application layer information from the AF.

The method includes the following steps:

Step 601 to step 606 are the same as above step 301 to step 306.

In step 607, the AM PCF sends an update request message to the UDR. Correspondingly, the UDR receives the update request message.

The update request message is a specific example of the request message in step 501a above.

The update request message includes event subscription information, terminal identification information and (DNN, S-NSSAI) combination, and the update request message is used to request the UDR to save the event subscription information in the terminal and the (DNN, S-NSSAI) combination corresponding contract data.

The event subscription information includes notification address and event identification information. Wherein, the notification address may be the address of the AM PCF. Optionally, when the AM PCF needs to save the event subscription information corresponding to multiple terminals to the UDR, if the AM PCF allocates the same notification address for different terminals, the event subscription information may also include a notification association identifier, the notification The association identifier is used to distinguish event subscription information of different terminals.

Optionally, the update request message may be a Nudr_DM_Update Request message.

As an implementation method, the condition that triggers the AM PCF to execute step 607 may be, for example: the AM PCF receives the application layer information used to decide the AM policy from the AF, and the AM PCF determines that it needs to determine the AM policy information according to the application layer information, so that the AM PCF The PCF decides to send the above update request message to the UDR. Moreover, the AM PCF determines according to the received application layer information that it needs to know the state of the PDU session or the state of the application. Wherein, the state of the PDU session is established or terminated, and the state of the application is started or stopped.

As an implementation method, if the above-mentioned information 1 or information 2 is included in the AM policy authorization request message in step 606, the above-mentioned event identification information may be set as the status of the PDU session (or PDU Session establishment/termination). If the above-mentioned information 3 or information 4 is included in the AM policy authorization request message in step 606, the above-mentioned event identification information may be set as application detection (or Application start/stop). Wherein, when the event identification information is application detection, the event subscription information further includes at least one application identification.

As an implementation method, the above-mentioned event subscription information may also include indication information, and the indication information is used to indicate a notification strategy, and the notification strategy is: multiple PDU sessions, notify the AM PCF when the first PDU session in the multiple PDU sessions is established, and notify the AM PCF when the last PDU session in the multiple PDU sessions is terminated (or released). That is, when the first PDU session among the multiple PDU sessions is established, the AM PCF is notified. When other PDU sessions are established, the AM PCF does not need to be notified. When a PDU session among the multiple PDU sessions is released, there is no If there is an active PDU session, the AM PCF is notified. When at least one PDU session in the active state exists after a certain PDU session in the multiple PDU sessions is released, the AM PCF is not notified.

Optionally, after the above step 607, the UDR may send a confirmation message to the AM PCF, and the message includes the identifier assigned by the UDR to the event subscription information, so that the subsequent AM PCF may modify or delete the event subscription information according to the identifier. The identifier assigned by UDR to event subscription information can be a resource identifier (resource uri), for example: {apiRoot}/nudr-dr/<apiVersion>/policy-data/ues/{ueId}/sm-data/subscriptions/{ subsId}.

Step 608 is the same as step 308 above.

In step 609, the SM PCF sends a query request message to the UDR, and the UDR receives the query request message accordingly.

The query request message includes the identification information of the terminal and the (DNN, S-NSSAI) combination, and the query request message is used to request to query the subscription data corresponding to the (DNN, S-NSSAI) combination of the terminal.

Optionally, the query request message may be an Ndur_DM_Query request message.

In step 610, the UDR sends a query response message to the SM PCF. Correspondingly, the SM PCF receives the query response message.

The query response message includes the terminal's subscription data corresponding to the (DNN, S-NSSAI) combination, and the subscription data includes the above-mentioned event subscription information.

Optionally, the query response message may be a Nudr_DM_Query Response message.

In step 611, the SM PCF sends a subscription request message to the UDR, and the UDR receives the subscription request message accordingly.

The subscription request message includes the identification information of the terminal and the (DNN, S-NSSAI) combination, and the subscription request message is used to request subscription of the terminal's subscription data corresponding to the (DNN, S-NSSAI) combination. That is, when the subscription data corresponding to the (DNN, S-NSSAI) combination of the terminal in the UDR changes, the UDR actively notifies the SM PCF. Wherein, the change of the subscription data includes the change of the event subscription information.

Optionally, the subscription request message may be an Ndur_DM_Subscribe request message.

In step 612, the UDR sends a subscription response message to the SM PCF. Correspondingly, the SM PCF receives the subscription response message.

Optionally, the subscription response message may be an Ndur_DM_Subscribe response message.

As an implementation method, the foregoing steps 609 to 610 may be performed, and the foregoing steps 611 to 612 may not be performed.

As an implementation method, the foregoing steps 611 to 612 may be performed, and the foregoing steps 609 to 610 may not be performed.

As an implementation method, not only the above steps 609 to 610, but also the above steps 611 to 612 are performed.

In step 613, the SM PCF detects an application start/stop event.

Specifically, the SM PCF interacts with the SMF to request detection of the application start/stop event, and then the SMF further interacts with the UPF to request the UPF to detect the application start/stop event.

This step is an optional step. Specifically, when the event identification information in the event subscription information acquired by the SM PCF is application detection (Application detection), step 613 is executed.

In step 614, the SM PCF sends a notification message to the AM PCF, and the AM PCF receives the notification message accordingly.

As an implementation method, if the event identification information in the event subscription information is the state of the PDU session, the SMPCF sends the notification message to the AM PCF according to the notification address in the event subscription information, and the notification message contains indication information, the indication information Indicates that the PDU session establishment is complete.

As another implementation method, if the event identification information in the event subscription information is application detection, and the SMF reports to the SMPCF that the application start event corresponding to the application identification is detected, the SM PCF sends the notification message to the AM PCF according to the notification address, The notification message includes indication information, and the indication information indicates that the application has started. Optionally, if the event subscription information includes identifiers of multiple applications, the notification message also includes the identifiers of the applications that have started.

Optionally, if the event subscription information includes a notification association identifier, the notification message includes the notification association identifier.

Optionally, when the UE establishes multiple PDU sessions for the same (DNN, S-NSSAI) combination, and these multiple PDU sessions select different SMFs, and the SMFs select different SM PCFs (that is, there are multiple SMs PCF has received the event subscription information), each SM PCF sends a notification message to the AM PCF when detecting the corresponding event in the event subscription information, and the notification message includes the identification of the SM PCF, the identification of the PDU session or the terminal's at least one of the addresses.

Optionally, when the SM PCF controls multiple PDU sessions corresponding to the same (DNN, S-NSSAI) combination, the notification message may also include the identification of the PDU session or the address of the terminal to distinguish different PDU sessions .

Optionally, the notification message may be an Npcf_PolicyAuthorization_Notify Request message.

Step 615 to step 620 are the same as above step 314 to step 319.

Optionally, in addition to the updated service area restriction information and the updated RFSP, the updated AM policy generated in step 615 may also include indication information, and the indication information is used to indicate that the updated AM policy is based on the corresponding determined by the application layer information.

Optionally, after the foregoing step 620, this embodiment of the present application may also perform part or all of the following steps 621 to 627.

In step 621, the SM PCF sends a notification message to the AM PCF, and the AM PCF receives the notification message accordingly.

As an implementation method, at a certain moment, the SM PCF detects the termination of the PDU session. For example, the SM PCF receives the SM policy association termination request message sent by the SMF, and then the SM PCF sends a notification to the AM PCF according to the notification address in the event subscription information. message, the notification message includes indication information, and the indication information indicates the termination or release of the PDU session.

As another implementation method, at a certain moment, the SMF reports to the SM PCF that the application corresponding to the application identifier is detected to stop, and the SM PCF sends the notification message to the AM PCF according to the notification address in the event subscription information. contains an indication that the application has stopped. Optionally, if the event subscription information includes identifiers of multiple applications, the notification message also includes the identifiers of the stopped applications.

Optionally, if the event subscription information includes a notification association identifier, the notification message includes the notification association identifier.

Optionally, when the UE establishes multiple PDU sessions for the same (DNN, S-NSSAI) combination, and these multiple PDU sessions select different SMFs, and the SMFs select different SM PCFs (that is, there are multiple SMs PCF has received the event subscription information), the notification message includes at least one of the identifier of the SM PCF, the identifier of the PDU session, or the address of the terminal.

Optionally, when the SM PCF controls multiple PDU sessions corresponding to the same (DNN, S-NSSAI) combination, the notification message may also include the identification of the PDU session or the address of the terminal to distinguish different PDU sessions .

The AM PCF may determine, according to at least one of the identifier of the SM PCF, the identifier of the PDU session, or the address of the terminal, which PDU session is terminated, or the application corresponding to which PDU session is stopped.

Optionally, the notification message may be an Npcf_PolicyAuthorization_Notify Request message.

In step 622, the AM PCF updates the AM policy.

The AM policy is also called a mobility management network element.

Specifically, after receiving the notification message in step 621, the AM PCF determines not to determine the AM policy based on the application layer information provided by the AF, but to determine an updated AM policy based on the terminal's subscription data and network policies. For the specific implementation of this step, reference may be made to the description in the foregoing step 302 .

Step 623 to step 627 are the same as above step 315 to step 319.

Optionally, in addition to the updated service area restriction information and the updated RFSP, the updated AM policy generated in step 622 may also include indication information, and the indication information is used to indicate that the updated AM policy is not based on the terminal corresponding It is determined based on the application layer information of the terminal, or is used to indicate that the updated AM policy is determined according to the subscription data of the terminal.

According to the above solution, the SM PCF obtains the event subscription information stored by the AMF in the subscription data from the UDR, and notifies the AM PCF after the PDU session is established or after the application start event is detected, thereby triggering the AM PCF to update according to the application layer information from the AF AM strategy. In this solution, the AM PCF does not need to subscribe the binding information of the SM PCF to the BSF, which can prevent the AM PCF from subscribing the binding information of the SM PCF to each BSF in the network without knowing the IP address of the terminal, so that Reduce signaling overhead and resource waste.

Fig. 7 is a communication method provided by the embodiment of the present application. In this method, the AF provides application layer information for a group of terminals or any terminal for AM policy decision-making, and the AM PCF obtains the application layer information from the UDR.

The method includes the following steps:

Step 701 to step 705 are the same as above step 401 to step 405.

Step 706 to step 726 are the same as above step 607 to step 627.

For the beneficial effects of this embodiment, reference may be made to the beneficial effects of the foregoing embodiment in FIG. 6 , and details are not repeated here.

Fig. 8 is a communication method provided by the embodiment of the present application, which is applied to the policy formulation process after the terminal moves and executes the AMF reselection process. In this method, the AF provides application layer information for a single terminal for AM policy decision-making, and the target AM PCF obtains the application layer information from the AF.

In this method, the AMF accessed before moving is called a source AMF (source AMF), or an old AMF (oldAMF). The AMF accessed after moving is called a target AMF (target AMF), or a new AMF (new AMF). The AM PCF that provides services for the terminal before moving is called a source AM PCF (source AM PCF), or an old AM PCF (old AMPCF), or a third PCF. The AM PCF that provides services for the terminal after moving is called a target AM PCF (target AMPCF), or a new AM PCF (new AM PCF), or a first PCF.

The method includes the following steps:

Step 801, when the terminal moves, the terminal sends a registration request message to the base station. Correspondingly, the base station receives the registration request message.

The registration request message carries identification information of the terminal.

Step 802, the base station selects a new AMF, that is, the target AMF.

Step 803, the base station sends a registration request message to the target AMF. Correspondingly, the target AMF receives the registration request message.

The registration request message carries identification information of the terminal.

Step 804a, the target AMF sends a context request message to the source AMF. Correspondingly, the source AMF receives the context request message.

The context request message includes terminal identification information.

Optionally, the context request message may be a Namf_Communication_UEContextTransferrequest message.

Step 804b, the source AMF sends a context response message to the target AMF. Correspondingly, the target AMF receives the context response message.

The context response message contains the context information of the terminal. The context information includes the authorized AM policy received by the source AMF from the source AMPCF. The authorized AM policy includes authorized service area restriction information and/or authorized RFSP. For details, please refer to The description of the embodiment of FIG. 6 is described above.

Optionally, the context response message further includes indication information, where the indication information indicates that the AM policy in the context information is determined according to the application layer information.

Optionally, the context response message may be a Namf_Communication_UEContextTransferresponse message.

Step 805, the target AMF sends a status update message to the source AMF. Correspondingly, the source AMF receives the status update message.

The status update message is used to indicate that the status synchronization of the terminal is completed.

Optionally, the status update message may be a Namf_Communication_RegistrationStatusUpdate message.

Step 806, the target AMF selects the target AM PCF, and sends an AM policy control request message to the target AM PCF. Correspondingly, the target AMF receives the AM policy control request message.

The AM policy control request message carries the authorized AM policy. Optionally, the AM policy control request message further includes the indication information of the above step 804b.

Optionally, the AM policy control request message may be an Npcf_AMPolicyControl_Create request message.

Step 807, the target AM PCF sends a registration request message to the BSF. Correspondingly, the BSF receives the registration request message.

Specifically, the target AM PCF determines not to determine the authorized AM policy based on the subscription data of the terminal according to the received authorized AM policy or according to the received indication information, but sends a registration request message to the BSF, and the registration request message includes For the binding information of the AM PCF, for the specific content of the binding information of the AM PCF, refer to the description in 303 above.

Optionally, the registration request message may be an Nbsf_Menagement_Register Request message.

In step 808, the BSF sends a notification message to the AF. Correspondingly, the AF receives the notification message.

Specifically, the BSF sends the notification message to the AF according to the subscription of the previous AF, and the notification message includes the identifier of the target AMPCF. Wherein, the subscription operation of the AF to the BSF may refer to the foregoing step 604 .

Optionally, the notification message may be a Nbsf_Management_Notify Request message.

In step 809, the AF sends an AM policy authorization request message to the target AM PCF, and accordingly, the target AM PCF receives the AM policy authorization request message.

For the specific implementation of this step, reference may be made to the description of the foregoing step 306 .

Step 810, the target AM PCF sends an update request message to the UDR. Correspondingly, the UDR receives the update request message.

For the specific implementation of this step, reference may be made to the description of the foregoing step 607 .

In step 811, the UDR sends a notification message to the SM PCF. Correspondingly, the SM PCF receives the notification message.

Specifically, the UDR sends a notification message to the SM PCF according to the previous SM PCF subscription, and the notification message includes the event subscription information saved by the target AM PCF to the UDR. Wherein, the subscription operation of the SM PCF to the UDR may refer to the foregoing step 609 .

Optionally, the notification message may be a Nudr_DM_Notify request message.

Step 812 is the same as step 613 above.

In step 813, the SM PCF sends a notification message to the target AM PCF, and the target AM PCF receives the notification message accordingly.

For the specific implementation of this step, reference may be made to the description of the foregoing step 614 .

Step 814, the target AM PCF sends an AM policy control response message to the target AMF. Correspondingly, the target AMF receives the AM policy control response message.

If the target AM PCF determines that the PDU session has been established or the application has started according to the notification message received in the above step 813, then the target AM PCF determines the updated AM policy according to the application layer information received in the above step 809, wherein the updated AM policy Includes updated service area restriction information and updated RFSP.

If the updated AM policy is the same as the authorized AM policy received in step 806 above, the AM policy control response message does not contain the updated AM policy. Optionally, an indication may be included in the AM policy control response message Information to indicate that the AM policy is not updated.

If the updated AM policy is different from the authorized AM policy received in step 806, the AM policy control response message includes the updated AM policy.

Optionally, the AM policy control response message may be an Npcf_AmPolicyControl_Create response message.

Step 815, the target AMF executes the updated AM policy.

That is, the AMF controls the terminal according to the updated AM policy.

Step 816, the target AMF sends a registration acceptance message to the terminal. Correspondingly, the terminal receives the registration acceptance message.

If the target AMF has received the updated AM policy in the above step 814, the registration acceptance message may carry the updated service area restriction information in the updated AM policy.

In step 817, the target AMF sends a notification message to the base station, and the notification message includes the updated service area restriction information and the updated RFSP.

The base station controls terminal access according to the updated service area restriction information, and determines a radio resource management strategy according to the updated RFSP.

This step is optional, and when the target AMF receives the updated AM policy in the above step 814, this step 817 is executed.

Step 818, the target AM PCF sends the event notification and the updated AM policy to the AF.

This step is optional. When the target AMF receives the updated AM policy in the above step 814, this step 818 is executed.

Optionally, the AM PCF may send the event notification and the updated AM policy to the AF through the Npcf_AMPolicyAuthorization_Notify message.

Step 819, the source AMF sends an AM policy deletion message to the source AM PCF. Correspondingly, the source AM PCF accepts the AM policy deletion message.

The AM policy delete message is used to request to delete the AM policy association.

Optionally, the AM policy deletion message may be an Npcf_AMPolicyControl_Delete message.

Step 820, the source AM PCF sends a de-registration request message to the BSF. Correspondingly, the BSF receives the de-registration request message.

The de-registration request message is used to request to delete the binding registration information of the source AM PCF.

Optionally, the deregistration request message may be an Nbsf_Management_DeregisterRequest message.

Step 821, the source AM PCF sends an update request message to the UDR. Correspondingly, the UDR receives the update request message.

The update request message includes indication information and an identifier of the event subscription information, and the indication information is used to request deletion of the event subscription information stored in the UDR. Wherein, the identifier of the event subscription information in the embodiment of the present application is also referred to as first identifier information.

Optionally, the update request message may be a Nudr_DM_Update Request message.

As an implementation method, if the source AMF sends the identifier of the event subscription information stored in the UDR by the source AM PCF to the target AMF through step 804, the target AMF may send the identifier of the event subscription information to the target in step 806 AM PCF, then in step 810, the target AM PCF sends an update request message to the UDR, the update request message includes event subscription information, terminal identification information and (DNN, S-NSSAI) combination, and the received The identifier of the event subscription information, the update request message is used to request that the event subscription information corresponding to the identifier of the event subscription information be updated, specifically, the notification address in the event subscription information is changed from the address of the source AM PCF to the address of the target AM The address of the PCF. In this case, the above step 821 may not need to be performed.

According to the above solution, in the scenario where the terminal moves, causing both the AMF and the AM PCF to be reselected, the target AM PCF can update the AM policy. In this solution, the target AM PCF does not need to subscribe the binding information of the SM PCF to the BSF, which can prevent the target AM PCF from subscribing the binding information of the SM PCF to each BSF in the network without knowing the IP address of the terminal. Thus, signaling overhead and resource waste can be reduced.

FIG. 9 is a communication method provided by an embodiment of the present application, which is applied to a policy formulation process after a terminal moves and performs an AMF reselection process. In this method, the AF provides application layer information for a group of terminals or any terminal for AM policy decision-making, and the target AM PCF obtains the application layer information from the UDR.

In this method, the AMF accessed before moving is called a source AMF (source AMF), or an old AMF (oldAMF). The AMF accessed after moving is called a target AMF (target AMF), or a new AMF (new AMF). The AM PCF that provides services for the terminal before moving is called a source AM PCF (source AM PCF), or an old AM PCF (old AMPCF), or a third PCF. The AM PCF that provides services for the terminal after moving is called a target AM PCF (target AMPCF), or a new AM PCF (new AM PCF), or a first PCF.

The method includes the following steps:

Step 901 to step 903 are the same as above step 801 to step 803.

Step 904a to step 904b are the same as above step 804a to step 804b.

Step 905 to step 906 are the same as above step 805 to step 806.

Step 907, the target AM PCF sends a subscription request message to the UDR. Correspondingly, the UDR receives the subscription request message.

Specifically, the target AM PCF determines not to immediately determine the authorized AM policy based on the subscription data of the terminal according to the received authorized AM policy or according to the received indication information, but sends a subscription request message to the UDR, in which Contains (S-NSSAI, DNN) combination and external group ID. The subscription request message is used for subscribing to application data related to AM, or understood as subscribing to AM influence information (AM influence information).

Wherein, the AM impact information may also be referred to as application layer information.

Optionally, the subscription request message may be a Nudr_DM_Subscribe request message.

Step 908, the UDR sends a notification message to the target AM PCF. Correspondingly, the target AM PCF receives the notification message.

The notification message includes AM impact information. Optionally, the notification message may be a Nudr_DM_Notifyrequest message.

Step 909, the target AM PCF sends an update request message to the UDR. Correspondingly, the UDR receives the update request message.

For the specific implementation of this step, reference may be made to the above step 607.

Step 910 to step 918 are the same as above step 811 to step 819.

Step 919 is the same as step 821 above.

For the beneficial effects of this embodiment, reference may be made to the beneficial effects of the foregoing embodiment in FIG. 8 , and details are not repeated here.

Figure 10 is a communication method provided by the embodiment of the present application. This method is a solution for AMPCF to subscribe to the above events to SMF via AMF. In this way, the SMPCF that AMPCF obtains the SMPCF identity and initiates event subscription to SMPCF can be avoided. Find out the problems raised, for example, it can avoid that AMPCF may need to subscribe SMPCF information to multiple BSF instances.

The method includes the following steps:

Step 1001 to step 1006 are the same as above step 601 to step 606.

Step 1007, the AM PCF sends an update request message to the AMF. Correspondingly, the AMF receives the update request message.

The update request message is an example of the first request message in step 501c above.

Specifically, the AM PCF receives the application layer information for determining the AM policy from the AF, and the AM PCF determines that the AM policy information needs to be determined according to the application layer information, so the AM PCF decides to send the above update request message to the AMF. In addition, the AMPCF determines according to the received application layer information that it needs to know the state of the PDU session or the state of the application. Wherein, the state of the PDU session is established or terminated, and the state of the application is started or stopped.

The update request message includes event subscription information and (DNN, S-NSSAI) combination, and the update request message is used to request the AMF to subscribe the event corresponding to the event subscription information to the SMF corresponding to the (DNN, S-NSSAI) combination, the The event is the state of the PDU session of the terminal or the state of the application of the terminal.

The event subscription information includes event identification information. As an implementation method, if the above-mentioned information 1 or information 2 is included in the AM policy authorization request message in step 1006, the above-mentioned event identification information may be set as the state of the PDU session. If the above-mentioned information 3 or information 4 is included in the AM policy authorization request message in step 1006, the above-mentioned event identification information may be set as application detection (or Application start/stop). Wherein, when the event identification information is application detection, the event subscription information further includes at least one application identification.

Optionally, the event subscription information also includes a notification address, which is the address of the AM PCF. After receiving the event subscription information, the AMF modifies the notification address in the event subscription information to the address of the AMF.

As an implementation method, the above-mentioned event subscription information may also include indication information, the indication information is used to indicate the notification strategy, and the notification strategy is: multiple The PDU session notifies the AM PCF when the first PDU session of the multiple PDU sessions is established, and notifies the AM PCF when the last PDU session of the multiple PDU sessions is terminated (or released). That is, when the first PDU session among the multiple PDU sessions is established, the AM PCF is notified. When other PDU sessions are established, the AM PCF does not need to be notified. When a PDU session among the multiple PDU sessions is released, there is no If there is an active PDU session, the AM PCF is notified. When at least one PDU session in the active state exists after a certain PDU session in the multiple PDU sessions is released, the AM PCF is not notified.

As another implementation method, the above-mentioned information 1 or information 2 is included in the AM policy authorization request message in the above step 1006, and the event corresponding to the event identification information is the state of the PDU session, and the state of the PDU session is (DNN, S-NSSAI) The establishment of the first session corresponding to the combination, or the termination of the last session corresponding to the (DNN, S-NSSAI) combination can be understood as the event identification information is used to indicate the detection of the first session corresponding to the (DNN, S-NSSAI) combination The establishment of a session, and/or the termination of the last session corresponding to the (DNN, S-NSSAI) combination, or it can be understood that the event identification information is used to indicate when the first session corresponding to a (DNN, S-NSSAI) combination Notify the AM PCF when a PDU session is established and/or notify the AM PCF when the last PDU session corresponding to a (DNN, S-NSSAI) combination is terminated. Therefore, when the AMF determines that the first PDU session corresponding to the combination of (DNN, S-NSSAI) in the update request message in step 1007 is established, the AMF may notify the AM PCF that the first PDU session is established. When the AMF determines that the last PDU session corresponding to the (DNN, S-NSSAI) combination in the update request message in step 1007 is terminated, the AMF may notify the AM PCF that the last PDU session is terminated.

Optionally, the update request message may be an Npcf_AMPolicyControl_UpdateNotify message.

Step 1008, after receiving the update request message, the AMF judges whether the target PDU session has been established.

The target PDU session is the PDU session corresponding to the (DNN, S-NSSAI) combination.

If the target PDU session has been established, the following step 1009 is performed.

If the target PDU session has not been established, perform the following steps 1010 to 1011.

In step 1009, the AMF sends a subscription request message to the SMF. Correspondingly, the SMF receives the subscription request message.

The SMF is the SMF that provides services for the target PDU session, or it can be understood that the SMF is the SMF corresponding to the combination of (DNN, S-NSSAI).

The subscription request message includes the above event subscription information.

Optionally, the subscription request message may be an Nsmf_EventExposure_Subscribe message.

Step 1010, the terminal sends a session establishment request message to the AMF. Correspondingly, the AMF receives the session establishment request message.

Optionally, the session establishment request message may be a PDU Session Establishment Request message.

Step 1011, AMF sends a subscription request message to SMF. Correspondingly, the SMF receives the subscription request message.

After the AMF determines that the session establishment request message is received, step 1011 is executed.

This step 1011 is the same as the above step 1009, and reference may be made to the foregoing description.

Step 1012, the SMF performs event detection according to the event subscription information.

If the event identification information in the event subscription information is the state of the PDU session, the SMF detects the state of the PDU session. If the event identification information in the event subscription information is application detection, the SMF detects that the application is started or stopped.

Step 1013, the SMF sends a notification message to the AMF. Correspondingly, the AMF receives the notification message.

As an implementation method, if the event identification information in the event subscription information is the state of the PDU session, the notification message includes indication information indicating that the establishment of the PDU session is completed. Optionally, when the update request message in step 1007 includes multiple (DNN, S-NSSAI) combinations, the notification message also includes the (DNN, S-NSSAI) combination corresponding to the established PDU session.

As another implementation method, if the event identification information in the event subscription information is application detection, and the SMF detects the application start event corresponding to the application identification, the notification message includes indication information indicating that the application has started. Optionally, if the event subscription information includes identifiers of multiple applications, the notification message also includes the identifiers of the applications that have started.

Optionally, the notification message may be an Nsmf_EventExposure_Notify message.

Step 1014, the AMF sends a notification message to the AM PCF. Correspondingly, the AM PCF receives the notification message.

As an implementation method, the content contained in the notification message is the same as the content contained in the notification message in step 1013 above.

As another implementation method, if the event identification information in step 1007 is used to indicate the establishment of the first session corresponding to the detection (DNN, S-NSSAI) combination, and/or the last session corresponding to the (DNN, S-NSSAI) combination The termination of a session, or the event identification information is used to indicate that the AM PCF is notified when the first PDU session corresponding to a (DNN, S-NSSAI) combination is established and/or when the first PDU session corresponding to a (DNN, S-NSSAI) combination is established. When the last PDU session is terminated, the AM PCF is notified, and the notification message includes indication information, which indicates the establishment of the PDU session, and further indicates the establishment of the first PDU session corresponding to the (DNN, S-NSSAI) combination.

Optionally, the notification message may be an Npcf_AMPolicyControl_Update message.

Step 1015 to step 1020 are the same as above step 615 to step 620.

Optionally, if the SMF determines that the state of the PDU session or the state of the application changes, the following steps 1021 to 1028 may also be performed.

In step 1021, the SMF sends a notification message to the AMF. Correspondingly, the AMF receives the notification message.

As an implementation method, at a certain moment, when the SMF detects that the PDU session is terminated, the notification message includes indication information, and the indication information indicates the termination or release of the PDU session.

As another implementation method, at a certain moment, when the SMF detects that the application corresponding to the application identifier is stopped, the notification message includes indication information, and the indication information indicates that the application has stopped. Optionally, if the event subscription information includes identifiers of multiple applications, the notification message also includes the identifiers of the stopped applications.

Optionally, the notification message may be an Nsmf_EventExposure_Notify message.

In step 1022, the AMF sends a notification message to the AM PCF. Correspondingly, the AM PCF receives the notification message.

The content contained in the notification message is the same as the content contained in the notification message in step 1021 above.

Optionally, the notification message may be an Npcf_AMPolicyControl_Update message.

Step 1023 to step 1028 are the same as above step 622 to step 627.

According to the above solution, the AM PCF obtains the status of the PDU session or the status of the application from the AMF, thereby triggering the AM PCF to update the AM policy according to the application layer information from the AF. In this solution, the AM PCF does not need to subscribe the binding information of the SM PCF to the BSF, which can prevent the AM PCF from subscribing the binding information of the SM PCF to each BSF in the network without knowing the IP address of the terminal, so that Reduce signaling overhead and resource waste.

Figure 10(a) is a communication method provided by the embodiment of the present application. This method is a solution for AMPCF to subscribe to the above event to SMF via AMF. In this way, it can avoid the problems caused by AMPCF obtaining the SMPCF identity and initiating event subscription to SMPCF. The problems caused by the SMPCF search from the source can be avoided, for example, the AMPCF may need to subscribe to the SMPCF information from multiple BSF instances.

The method includes the following steps:

Step 1001a to step 1006a are the same as step 601 to step 606 above.

In step 1007a, the AM PCF sends an update request message to the AMF. Correspondingly, the AMF receives the update request message.

The update request message is an example of the first request message in step 501c above.

Specifically, the AM PCF receives the application layer information for determining the AM policy from the AF, and the AM PCF determines that the AM policy information needs to be determined according to the application layer information, so the AM PCF decides to send the above update request message to the AMF. In addition, the AMPCF determines according to the received application layer information that it needs to know the status of the PDU session. Wherein, the state of the PDU session is established or terminated.

The update request message includes event subscription information and (DNN, S-NSSAI) combination, and the update request message is used to request AMF to subscribe to events corresponding to the (DNN, S-NSSAI) combination and the event subscription information.

The event subscription information includes event identification information. As an implementation method, if the above-mentioned information 1 or information 2 is included in the AM policy authorization request message in step 1006a, the above-mentioned event identification information may be set as the state of the PDU session. For this implementation method, the update request message is used to request the AMF to subscribe to the state of the PDU session corresponding to the (DNN, S-NSSAI) combination.

As an implementation method, indication information may also be included in the above event subscription information, and the indication information is used to indicate a notification strategy. The notification strategy is: for multiple PDU sessions corresponding to the same (DNN, S-NSSAI) combination, The AM PCF is notified when the first PDU session of the plurality of PDU sessions is established, and the AM PCF is notified when the last PDU session of the plurality of PDU sessions is terminated (or released). That is, when the first PDU session among the multiple PDU sessions is established, the AM PCF is notified. When other PDU sessions are established, the AM PCF does not need to be notified. When a PDU session among the multiple PDU sessions is released, there is no If there is an active PDU session, the AM PCF is notified. When at least one PDU session in the active state exists after a certain PDU session in the multiple PDU sessions is released, the AM PCF is not notified.

As another implementation method, if the above-mentioned information 1 or information 2 is included in the AM policy authorization request message in the above step 1006a, the event corresponding to the event identification information is the state of the PDU session, and the state of the PDU session is (DNN, S-NSSAI ) combination corresponding to the establishment of the first session, or the (DNN, S-NSSAI) combination corresponding to the termination of the last session, it can be understood that the event identification information is used to indicate the detection of the (DNN, S-NSSAI) combination corresponding to the first The establishment of a session, and/or the termination of the last session corresponding to a (DNN, S-NSSAI) combination, or understood as, the event identification information is used to indicate when a (DNN, S-NSSAI) combination corresponds to the first PDU Notify the AM PCF when the session is established and/or notify the AM PCF when the last PDU session corresponding to a (DNN, S-NSSAI) combination is terminated. Therefore, when the AMF determines that the first PDU session corresponding to the (DNN, S-NSSAI) combination in the update request message in step 1007a is established, the AMF may notify the AM PCF that the first PDU session has been established. When the AMF determines that the last PDU session corresponding to the (DNN, S-NSSAI) combination in the update request message in step 1007a is terminated, the AMF may notify the AM PCF that the last PDU session has terminated.

Optionally, the update request message may be an Npcf_AMPolicyControl_UpdateNotify message.

In step 1008a, the AMF sends a notification message to the AM PCF. Correspondingly, the AM PCF receives the notification message.

As an implementation method, if the event identification information in step 1007a is the state of the PDU session, when the AMF judges that the PDU session corresponding to the (DNN, S-NSSAI) combination has been established, then execute this step 1008a, and this step 1008a The notification message includes indication information, and the indication information indicates that the establishment of the PDU session is completed. Optionally, when the update request message in step 1007a includes multiple (DNN, S-NSSAI) combinations, the notification message in step 1008a also includes the (DNN, S-NSSAI) combination corresponding to the established PDU session.

As another implementation method, if the event subscription information in step 1007a includes indication information, the indication information is used to indicate the notification strategy, and the notification strategy is: multiple PDU sessions, notify the AM PCF when the first PDU session among the multiple PDU sessions is established, and notify the AM PCF when the last PDU session among the multiple PDU sessions is terminated (or released), when the AMF judges by itself If the PDU session corresponding to the (DNN, S-NSSAI) combination has been established, then step 1008a is performed, and the notification message in step 1008a includes indication information, which indicates that the PDU session is established, further indicating that (DNN, S-NSSAI ) The first PDU session corresponding to the combination is established.

As another implementation method, if the event identification information in step 1007a is used to indicate the establishment of the first session corresponding to the detection (DNN, S-NSSAI) combination, and/or the last session corresponding to the (DNN, S-NSSAI) combination The termination of a session, or the event identification information is used to indicate that the AM PCF is notified when the first PDU session corresponding to a (DNN, S-NSSAI) combination is established and/or when the first PDU session corresponding to a (DNN, S-NSSAI) combination is established. Notify the AM PCF when the last PDU session is terminated. When the AMF judges that the PDU session corresponding to the (DNN, S-NSSAI) combination has been established, the step 1008a is executed, and the notification message of the step 1008a contains indication information, the indication The information indicates the establishment of the PDU session, and further indicates the establishment of the first PDU session corresponding to the (DNN, S-NSSAI) combination.

Optionally, the notification message in step 1008a may be an Npcf_AMPolicyControl_Update message.

As an implementation method, before step 1008a, the terminal establishes the PDU session corresponding to the (DNN, S-NSSAI) combination by interacting with network elements (including AMF) on the network side, so AMF can context, determine (or say: detect) that the PDU session corresponding to the (DNN, S-NSSAI) combination has been established.

Step 1009a to step 1014a are the same as step 615 to step 620 above.

Optionally, if the AMF determines that the state of the PDU session changes, it may also perform the following steps 1015a to 1021a.

In step 1015a, the AMF sends a notification message to the AM PCF. Correspondingly, the AM PCF receives the notification message.

At a certain moment, the AMF determines that the PDU session is terminated, and then this step 1015a can be executed. For example, the AMF may receive a PDU session termination/release request message from the terminal, and then the AMF may determine that the PDU session is terminated according to the PDU session termination/release request message. For another example, when the AMF receives a notification message from the SMF indicating that the PDU session is terminated, the AMF may determine that the PDU session is terminated according to the notification message.

As an implementation method, if the event identification information in step 1007a is the state of the PDU session, the notification message in step 1015a includes indication information, and the indication information indicates the termination of the PDU session. Optionally, when the update request message in step 1007a includes multiple (DNN, S-NSSAI) combinations, the notification message in step 1015a also includes the (DNN, S-NSSAI) combination corresponding to the established PDU session.

As another implementation method, if the event subscription information in step 1007a includes indication information, the indication information is used to indicate the notification strategy, and the notification strategy is: multiple PDU sessions, notify AM PCF when the first PDU session in the multiple PDU sessions is set up, and notify AM PCF when the last PDU session in the multiple PDU sessions terminates (or releases), then this step 1015a The notification message includes indication information, which indicates the termination of the PDU session, and further indicates the establishment of the first PDU session corresponding to the (DNN, S-NSSAI) combination.

As another implementation method, if the event identification information in step 1007a is used to indicate the establishment of the first session corresponding to the detection (DNN, S-NSSAI) combination, and/or the last session corresponding to the (DNN, S-NSSAI) combination The termination of a session, or the event identification information is used to indicate that the AM PCF is notified when the first PDU session corresponding to a (DNN, S-NSSAI) combination is established and/or when the first PDU session corresponding to a (DNN, S-NSSAI) combination is established. When the last PDU session is terminated, the AM PCF is notified, and the notification message in step 1015a includes indication information, which indicates the termination of the PDU session, and further indicates the termination of the last PDU corresponding to the (DNN, S-NSSAI) combination.

Optionally, the notification message in step 1015a may be an Npcf_AMPolicyControl_Update message.

Step 1016a to step 1021a are the same as step 622 to step 627 above.

According to the above solution, the AM PCF obtains the status of the PDU session from the AMF, thereby triggering the AM PCF to update the AM policy according to the application layer information from the AF. In this solution, the AM PCF does not need to subscribe the binding information of the SM PCF to the BSF, which can prevent the AM PCF from subscribing the binding information of the SM PCF to each BSF in the network without knowing the IP address of the terminal, so that Reduce signaling overhead and resource waste.

It can be understood that, in order to implement the functions in the foregoing embodiments, the AF and the base station include hardware structures and/or software modules corresponding to each function. 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. 11 and FIG. 12 are schematic structural diagrams of possible communication devices provided by the embodiments of the present application. These communication devices can be used to implement the functions of the first PCF, the second PCF, UDR, AMF or SMF in the above method embodiments, and thus can also realize the beneficial effects of the above method embodiments. In the embodiment of the present application, the communication device may be the first PCF, the second PCF, UDR, AMF or SMF, or a module (such as a chip) applied to the first PCF, the second PCF, UDR, AMF or SMF ).

As shown in FIG. 11 , a communication device 1100 includes a processing unit 1110 and a transceiver unit 1120 . The communication device 1100 is used to implement the first PCF and the second PCF in the method embodiments shown in Fig. 5(a), Fig. 5(b), Fig. 5(c), Fig. 6 to Fig. 10 and Fig. 10(a) , UDR, AMF or SMF functions.

When the communication device 1100 is used to realize the function of the first PCF in the method embodiment shown in FIG. 5(a), FIG. 6 or FIG. 7: the transceiver unit 1120 is configured to send a request message to the data management network element, the request message contains terminal identification information, event identification information and notification address, the event identification information is used to indicate the state of the detection session or the application state, and the notification address is the first policy control for receiving the event notification corresponding to the event identification information The address of the network element, the request message is used to request the data management network element to save the event identification information and the notification address; receive the notification message from the second policy control network element, the notification message contains the session status of the terminal or The state of the application of the terminal, the state of the session of the terminal or the state of the application of the terminal is detected according to the event identification information obtained from the data management network element; the processing unit 1110 is configured to, according to the state of the session of the terminal The state or the state of the application of the terminal determines the mobility management policy; wherein, the first policy control network element is used to formulate the mobility management policy, and the second policy control network element is used to formulate the session management policy.

As a possible implementation method, the processing unit 1110 is specifically configured to: when the session state of the terminal is session establishment or the application state of the terminal is application start, the first policy control network element according to the application function network element Application layer information determines the mobility management policy.

As a possible implementation method, the transceiver unit 1120 is further configured to receive a response message from the data management network element, where the response message includes first identification information, and the first identification information is the event identification information and the notification address The first identification information is used to modify or delete the event identification information and/or the notification address.

As a possible implementation method, the transceiver unit 1120 is further configured to send the mobility management policy to the application function network element.

As a possible implementation method, the transceiver unit 1120 is further configured to receive third indication information from the mobility management network element, where the third indication information is used to indicate that the mobility management strategy used by the terminal is determined according to the application layer information The first policy control network element delays determining the mobility management policy according to the third indication information; wherein the first policy control network element is a policy control network element that provides services for the terminal after the terminal moves.

When the communication device 1100 is used to realize the function of the second PCF in the method embodiment shown in FIG. 5(a), FIG. 6 or FIG. 7: the transceiver unit 1120 is used to receive event identification information and notifications from data management network elements address, the event identification information is used to indicate the status of the detection session or the application status, the notification address is the address of the first policy control network element used to receive the event notification corresponding to the event identification information; the processing unit 1110 is configured to, according to The event identification information detects the session state of the terminal or the application state of the terminal; the transceiver unit 1120 is further configured to send a notification message to the first policy control network element according to the notification address, and the notification message includes the terminal's The state of the session or the state of the application of the terminal; wherein, the first policy control network element is used to formulate a mobility management policy, and the second policy control network element is used to formulate a session management policy.

As a possible implementation method, the transceiver unit 1120 is configured to send a query request message to the data management network element, where the query request message is used to request to query the subscription data of the terminal; the second policy control network element receives the data from the A query response message of the management network element, the query response message includes the subscription data of the terminal, and the subscription data includes the event identification information and the notification address.

As a possible implementation method, the transceiver unit 1120 is configured to send a subscription data subscription request message to the data management network element, and the subscription data subscription request message is used to request a notification of a change in the subscription data of the terminal; A notification message of the network element, the notification message includes the changed subscription data of the terminal, and the changed subscription data includes the event identification information and the notification address.

When the communication device 1100 is used to implement the UDR function in the method embodiment shown in FIG. 5(a), FIG. 6 or FIG. 7: the transceiver unit 1120 is configured to receive a request message from the first policy control network element, the request The message includes terminal identification information, event identification information and a notification address, the event identification information is used to indicate the state of the detection session or the application state, and the notification address is the first address used to receive the event notification corresponding to the event identification information The address of the policy control network element; the request message is used to request the data management network element to save the event identification information and the notification address; and send the event identification information and the notification address to the second policy control network element; wherein, the first A policy control network element is used to formulate a mobility management policy, and the second policy control network element is used to formulate a session management policy.

As a possible implementation method, the transceiver unit 1120 is configured to receive a query request message from the second policy control network element, where the query request message is used to request to query the subscription data of the terminal; An inquiry response message is sent, the inquiry response message includes the subscription data of the terminal, and the subscription data includes the event identification information and the notification address.

As a possible implementation method, the transceiver unit 1120 is configured to receive a subscription data subscription request message from the second policy control network element, where the subscription data subscription request message is used to request a notification of a change in the subscription data of the terminal; The second policy control network element sends a notification message, the notification message includes the changed subscription data of the terminal, and the changed subscription data includes the event identification information and the notification address.

As a possible implementation method, the transceiver unit 1120 is configured to send a response message to the first policy control network element, where the response message includes first identification information, and the first identification information is the event identification information and the notification address The first identification information is used to modify or delete the event identification information and/or the notification address.

When the communication device 1100 is used to realize the function of the first PCF in the method embodiment shown in FIG. 5(b), FIG. 8 or FIG. 9: the transceiver unit 1120 is configured to send a request message to the data management network element, the request message contains the first identification information and the first notification address, the first identification information is the event identification information saved by the data management network element and the identification information of the second notification address, the event identification information is used to indicate the status of the detection session or the application state, the first notification address is the address of the first policy control network element used to receive the event notification corresponding to the event identification information, and the second notification address is the third network element used to receive the event notification corresponding to the event identification information The address of the policy control network element, the request message is used to request the data management network element to update the second notification address to the first notification address; and receive a notification message from the second policy control network element, the notification message includes The state of the session of the terminal or the state of the application of the terminal, the state of the session of the terminal or the state of the application of the terminal is detected according to the event identification information obtained from the data management network element; the processing unit 1110 is configured to The state of the session of the terminal or the state of the application of the terminal determines the mobility management policy; wherein, the first policy control network element and the third policy control network element are used to formulate a mobility management policy, and the second policy control network The first policy control network element is the policy control network element that provides services for the terminal after the terminal moves, and the third policy control network element is the policy control network element that provides services for the terminal before the terminal moves Control network elements.

When the communication device 1100 is used to realize the function of the first PCF in the method embodiment shown in FIG. 5(c), FIG. 10 or FIG. 10(a): the transceiver unit 1120 is configured to send the first A request message, the first request message includes event identification information, the event identification information is used to indicate the session status of the detection terminal or the application status of the terminal, and the first request message is used to request event notification corresponding to the event identification information and, receiving a notification message from the mobility management network element or the session management network element corresponding to the session, where the notification message includes the state of the session of the terminal or the state of the application of the terminal, the state of the session of the terminal or The state of the application of the terminal is detected according to the event identification information; the processing unit 1110 is configured to determine a mobility management policy according to the state of the session of the terminal or the state of the application of the terminal; wherein, the first policy control network Elements are used to formulate mobility management policies.

As a possible implementation method, the processing unit 1110 is specifically configured to determine the mobility management policy according to the application layer information from the application function network element when the state of the session is session establishment or the state of the application is application start.

As a possible implementation method, the transceiver unit 1120 is configured to send the mobility management policy to the application function network element.

When the communication device 1100 is used to implement the function of SMF in the method embodiment shown in FIG. 5(c) or FIG. 10: the transceiver unit 1120 is configured to receive a second request message from a mobility management network element, the second request The message includes event identification information, the event identification information is used to indicate the state of the session of the detection terminal or the state of the application of the terminal, and the second request message is used to request the event notification corresponding to the event identification information; the processing unit 1110 is configured to According to the event identification information, detect the state of the session of the terminal or the state of the application of the terminal; the transceiver unit 1120 is further configured to send a notification message to the mobility management network element or the first policy control network element corresponding to the terminal, The notification message includes the session state of the terminal or the application state of the terminal; wherein the first policy control network element is a policy control network element for formulating a mobility management policy.

When the communication device 1100 is used to implement the AMF function in the method embodiment shown in FIG. 5(c), FIG. 10 or FIG. 10(a): the transceiver unit 1120 is configured to receive the first policy control network element from the first A request message, the first request message includes event identification information, the event identification information is used to indicate the session status of the detection terminal or the application status of the terminal, and the first request message is used to request event notification corresponding to the event identification information and, after the processing unit 1110 detects the event corresponding to the event identification information, send a notification message to the first policy control network element, the notification message includes the state of the session of the terminal or the state of the application of the terminal, the session of the terminal The state of the terminal or the state of the application of the terminal is detected according to the event identification information; the processing unit 1110 is configured to detect the event corresponding to the event identification information, wherein the first policy control network element is used to formulate a mobility management policy.

As a possible implementation method, the transceiver unit 1120 is configured to send the notification to the first policy control network element after the processing unit 1110 detects that the session corresponding to the (DNN, S-NSSAI) combination of the terminal is established message, the notification message includes the state of the session, and the state of the session is session establishment.

As a possible implementation method, the transceiver unit 1120 is configured to send the first policy control network element to the first policy control network element after the processing unit 1110 detects that the terminal's session corresponding to the (DNN, S-NSSAI) combination ends. A notification message, the first notification message includes the state of the session, and the state of the session is session termination.

As a possible implementation method, the transceiver unit 1120 is configured to, after the processing unit 1110 detects that the terminal's first session corresponding to the (DNN, S-NSSAI) combination is established, send The first notification message is sent, the first notification message includes the state of the session, and the state of the session is session establishment.

As a possible implementation method, the transceiver unit 1120 is configured to, after the processing unit 1110 detects that the terminal's last session corresponding to the (DNN, S-NSSAI) combination ends, send The first notification message includes the state of the session, and the state of the session is session termination.

As a possible implementation method, the transceiver unit 1120 is configured to send a second request message to the session management network element, the second request message includes the event identification information, and the second request message is used to request that the event identification information corresponds to event notification; receive a notification message from the session management network element, the notification message includes the application state of the terminal or the session state of the terminal; send the notification message to the first policy control network element, the notification message contains the state of the terminal's application or the state of the terminal's session.

A more detailed description of the processing unit 1110 and the transceiver unit 1120 can be directly obtained by referring to the relevant descriptions in the method embodiments shown in Fig. 5(a), Fig. 5(b), Fig. 5(c), and Fig. 6 to Fig. 10 , without repeating them here.

As shown in FIG. 12 , a communication device 1200 includes a processor 1210 and an interface circuit 1220 . The processor 1210 and the interface circuit 1220 are coupled to each other. It can be understood that the interface circuit 1220 may be a transceiver or an input/output interface. Optionally, the communication device 1200 may further include a memory 1230 for storing instructions executed by the processor 1210 or storing input data required by the processor 1210 to execute the instructions or storing data generated after the processor 1210 executes the instructions.

When the communication device 1200 is used to implement the methods shown in FIG. 5(a), FIG. 5(b), FIG. 5(c), and FIG. 6 to FIG. The circuit 1220 is used to realize the functions of the transceiver unit 1120 described above.

It can be understood that the processor in the embodiment 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 can be located in the base station or the terminal. Certainly, the processor and the storage medium may also exist in the base station or the terminal as discrete components.

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, a base station, 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; or it may be a semiconductor medium, such as a solid-state hard disk. The computer readable storage medium may be a volatile or a nonvolatile storage medium, or may include both volatile and nonvolatile types of storage media.

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.

In this application, "at least one" means one or more, and "multiple" means two or more. "And/or" describes the association relationship of associated objects, indicating that there may be three types of relationships, for example, A and/or B, which can mean: A exists alone, A and B exist simultaneously, and B exists alone, where A, B can be singular or plural. In the text description of this application, the character "/" generally indicates that the contextual objects are an "or" relationship; in the formulas of this application, the character "/" indicates that the contextual objects are a "division" 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.

Claims (20)

1. A method of communication, comprising:

a first policy control network element sends a first request message to a mobility management network element, wherein the first request message contains event identification information, the first request message is used for requesting an event notification corresponding to the event identification information, and an event corresponding to the event identification information is a session state of a terminal or an application state of the terminal;

the first policy control network element receives a first notification message from the mobility management network element, where the first notification message includes a session state of the terminal or an application state of the terminal;

the first policy control network element determines a mobility management policy according to a state of a session of the terminal or a state of an application of the terminal; wherein the first policy control network element is configured to formulate a mobility management policy.

2. The method of claim 1, wherein the (DNN, S-NSSAI) combination is further included in the first request message, and wherein the (DNN, S-NSSAI) combination is determined based on application layer information from an application function network element.

3. The method of claim 2, wherein the state of the session comprises establishment of a session corresponding to the (DNN, S-NSSAI) combination or termination of a session corresponding to the (DNN, S-NSSAI) combination.

4. The method of claim 2, wherein the first request message further includes first indication information, and the first indication information is used to indicate a notification policy, and the notification policy is: and sending the first notification message when a first session corresponding to the (DNN, S-NSSAI) combination is established, and/or sending the first notification message when a last session corresponding to the (DNN, S-NSSAI) combination is terminated.

5. The method of claim 2, wherein the state of the session is establishment of a first session corresponding to the (DNN, S-NSSAI) combination or termination of a last session corresponding to the (DNN, S-NSSAI) combination.

6. A method according to any of claims 1 to 5, wherein the event identification information is determined from application layer information from an application function network element.

7. The method according to any of claims 1 to 6, wherein the determining, by the first policy control network element, a mobility management policy according to a state of a session of the terminal or a state of an application of the terminal comprises:

and when the session state of the terminal is session establishment or the application state is application start, the first policy control network element determines the mobility management policy according to application layer information from an application function network element.

8. A method of communication, comprising:

a mobility management network element receives a first request message from a first policy control network element, where the first request message includes event identification information, the first request message is used to request an event notification corresponding to the event identification information, and an event corresponding to the event identification information is a session state of a terminal or an application state of the terminal;

after detecting the event corresponding to the event identification information, the mobility management network element sends a first notification message to the first policy control network element, where the first notification message includes a session state of the terminal or an application state of the terminal; wherein the first policy control network element is configured to formulate a mobility management policy.

9. The method of claim 8 wherein the first request message further includes a (DNN, S-NSSAI) combination;

the first request message is used for requesting an event notification corresponding to the event identification information, and includes:

the first request message is for requesting a state of a session or a state of an application of the terminal corresponding to the (DNN, S-NSSAI) combination.

10. The method of claim 9, wherein after the mobility management network element detects the event corresponding to the event identification information, sending a first notification message to the first policy control network element, includes:

after detecting that the session corresponding to the (DNN, S-NSSAI) combination of the terminal is established, the mobility management network element sends the first notification message to the first policy control network element, where the first notification message includes a state of the session, and the state of the session is session establishment.

11. The method of claim 9, wherein after the mobility management network element detects the event corresponding to the event identification information, sending a first notification message to the first policy control network element, includes:

after detecting that the session of the terminal corresponding to the (DNN, S-NSSAI) combination is terminated, the mobility management network element sends the first notification message to the first policy control network element, where the first notification message includes a state of the session, and the state of the session is the session termination.

12. The method of claim 9, wherein the first request message further includes first indication information, and the first indication information is used to indicate a notification policy, and the notification policy is: and sending the first notification message when a first session corresponding to the (DNN, S-NSSAI) combination is established, and/or sending the first notification message when a last session corresponding to the (DNN, S-NSSAI) combination is terminated.

13. The method of claim 9, wherein the state of the session is either a first session setup corresponding to the (DNN, S-NSSAI) combination or a last session termination corresponding to the (DNN, S-NSSAI) combination.

14. The method of claim 12 or 13, wherein after detecting the event corresponding to the event identification information, the mobility management network element sends a first notification message to the first policy control network element, where the method includes:

after detecting that a first session corresponding to the (DNN, S-NSSAI) combination of the terminal is established, the mobility management network element sends the first notification message to the first policy control network element, where the first notification message includes a state of the session, and the state of the session is session establishment.

15. The method of claim 12 or 13, wherein after detecting the event corresponding to the event identification information, the mobility management network element sends a first notification message to the first policy control network element, where the method includes:

after detecting that the last session of the terminal corresponding to the (DNN, S-NSSAI) combination is terminated, the mobility management network element sends the first notification message to the first policy control network element, where the first notification message includes a state of the session, and the state of the session is terminated.

16. The method of any one of claims 8 to 15, wherein after detecting the event corresponding to the event identification information, the mobility management network element sends a first notification message to the first policy control network element, where the method includes:

the mobility management network element receives the first request message and then sends a second request message to a session management network element, wherein the second request message comprises the event identification information;

and the mobility management network element receives a second notification message sent from the session management network element and then sends the first notification message to the first policy control network element, wherein the second notification message contains the session state of the terminal or the application state of the terminal.

17. A communications device comprising means for performing the method of any of claims 1 to 7.

18. A communications device comprising means for performing the method of any of claims 8 to 16.

19. A communication system comprising a first policy control network element for performing the method of any one of claims 1 to 7, and a mobility management network element for performing the method of any one of claims 8 to 16.

20. A computer-readable storage medium, in which a computer program or instructions is stored which, when executed by a communication apparatus, carries out the method of any one of claims 1 to 7, or claims 8 to 16.

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