CN119211998A - Packet loss optimization method, related device and communication system applied to 5G system UPF - Google Patents
Packet loss optimization method, related device and communication system applied to 5G system UPF Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/06—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
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- H04L67/1001—Protocols in which an application is distributed across nodes in the network for accessing one among a plurality of replicated servers
- H04L67/10015—Access to distributed or replicated servers, e.g. using brokers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/08—Load balancing or load distribution
- H04W28/09—Management thereof
- H04W28/0925—Management thereof using policies
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/08—Load balancing or load distribution
- H04W28/09—Management thereof
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Abstract
The application relates to the technical field of communication, and discloses a packet loss optimization method, a related device and a communication system applied to a UPF (unified packet loss) of a 5G system. The user plane function network element UPF pre-stores the server address information sent by the session management device SMF, the user plane function network element UPF verifies the target address information corresponding to the target message based on the pre-stored server address information, if the server address information and the target address information are consistent, the target message is transmitted, so that the identification efficiency and the accuracy of the related message are improved, the problem of packet loss of the message when the load of the user plane function network element is higher is avoided, and the success rate of key service data transmission and the user experience effect are improved.
Description
Technical Field
The present application relates to the field of communications technologies, and in particular, to a packet loss optimization method, a related device, and a communications system applied to a 5G system UPF.
Background
In the fifth generation communication system (5G), the UPF (User Plane Function ) is the actual forwarding point for user data flows for handling data forwarding for the user plane. When the UPF is in a high load state, problems such as packet loss and delay increase may be caused, which affect the user experience and the service quality.
To solve the above problem, the UPF may selectively discard packets of low priority or non-critical traffic to ensure quality of critical traffic and reduce its own load. However, in this process, some important key signaling is also misidentified by the UPF as a common data flow, so that the key signaling is discarded by the UPF, which may cause the data transmission at the user service layer to be damaged, and the continuity and user experience of the user service data transmission cannot be ensured.
Disclosure of Invention
Aiming at the problems, the application provides a packet loss optimization method and a related device applied to a UPF of a 5G system, which realize the improvement of the success rate of key service data transmission and the effect of user experience.
In order to achieve the above object, the present application provides the following technical solutions:
A packet loss optimization method applied to a 5G system UPF, applied to a user plane function network element UPF, the method comprising:
Under the condition that the user equipment and the proxy call session server establish a communication session, a target message to be transmitted between the user equipment and the proxy call session server is obtained;
If the load of the UPF is higher than a target load threshold, resolving the network communication address of the target message to obtain target address information corresponding to the target message;
and if the target address information corresponding to the target message is consistent with the server address information prestored in the UPF, transmitting the target message.
Optionally, the method further comprises:
If the target address information corresponding to the target message is inconsistent with the server address information prestored in the UPF, determining the priority of the target message;
And if the priority of the target message is lower than the target priority, discarding the target message, and not transmitting the target message.
Optionally, if the target address information corresponding to the target message is consistent with the server address information pre-stored in the UPF, transmitting the target message includes:
If the target message is an uplink message sent by the user equipment, if the target address information of the uplink message is consistent with the address information of the server pre-stored in the UPF, transmitting the uplink message to a data network, wherein the target address information represents the target address information of the uplink message;
And if the target message is a downlink message sent to the user equipment by the proxy call session server and the target address information represents source address information of the downlink message, forwarding the downlink message to the user equipment if the source address information corresponding to the downlink message is consistent with the server address information prestored in the UPF.
Optionally, the method further comprises:
and under the condition that the user equipment sends request information for creating the data session with the proxy call session server to a session management device (SMF), receiving response information for creating the data session sent by the SMF, and storing server address information which is carried by the response information and corresponds to the proxy call session server.
A packet loss optimization method applied to a 5G system UPF, applied to a session management device SMF, the method comprising:
Receiving request information of user equipment for creating a data session with a proxy call session server;
determining server address information corresponding to the proxy call session server based on configuration information of the session management device SMF itself;
Transmitting request information carrying server address information corresponding to the proxy call session server to a user plane function network element UPF;
And in response to receiving response information of successful creation of the data session sent by the UPF, sending response information carrying server address information corresponding to the proxy call session server to the user equipment so as to establish the data session between the user equipment and the proxy call session server.
A user plane functional network element comprising:
The first acquisition unit is used for acquiring a target message to be transmitted between the user equipment and the proxy call session server under the condition that the user equipment and the proxy call session server establish a communication session;
The first analyzing unit is used for analyzing the network communication address of the target message to obtain target address information corresponding to the target message if the load of the user plane function network element is higher than a target load threshold;
And the transmission unit is used for transmitting the target message if the target address information corresponding to the target message is consistent with the server address information pre-stored by the user plane function network element.
Optionally, the user plane functional network element further includes:
A first determining unit, configured to determine a priority of the target packet if target address information corresponding to the target packet is inconsistent with server address information pre-stored by the user plane function network element;
The message discarding processing unit is used for discarding the target message and not transmitting the target message if the priority of the target message is lower than the target priority;
And the storage unit is used for receiving response information for creating the data session sent by the SMF and storing server address information corresponding to the proxy call session server, which is carried by the response information, under the condition that the user equipment sends request information for creating the data session with the proxy call session server to the session management device SMF.
Optionally, the transmission unit includes:
A first transmission subunit, configured to, if the target address information of the uplink packet is consistent with the address information of the server pre-stored in the user plane function network element, transmit the uplink packet to a data network, where the target address information characterizes the destination address information of the uplink packet;
And the second transmission subunit is used for forwarding the downlink message to the user equipment if the source address information corresponding to the downlink message is consistent with the server address information pre-stored by the user plane function network element under the condition that the target message is the downlink message sent to the user equipment by the proxy call session server and the target address information represents the source address information of the downlink message.
A session management apparatus comprising:
A second receiving unit, configured to receive request information for creating a data session with a proxy call session server by a user equipment;
A second determining unit configured to determine server address information corresponding to the proxy call session server based on configuration information of the session management apparatus itself;
a first sending unit, configured to send request information carrying server address information corresponding to the proxy call session server to a user plane function network element UPF;
And the second sending unit is used for responding to the received response information of successful creation of the data session sent by the UPF and sending the response information carrying the server address information corresponding to the proxy call session server to the user equipment so as to realize the establishment of the data session between the user equipment and the proxy call session server.
A communication system, the communication system comprising:
The user plane function network element, the session management device and the user equipment according to any one of the above, wherein the user equipment establishes a communication connection with a proxy call session server based on the user plane function network element and the session management device.
Compared with the prior art, the application provides a packet loss optimization method, a related device and a communication system applied to a UPF (unified packet loss) of a 5G system, wherein under the condition that a communication session is established between user equipment and a proxy call server, a target message to be transmitted between the user equipment and the user equipment is obtained, and a network communication address of the target message is analyzed to obtain target address information corresponding to the target message. The user plane function network element UPF pre-stores the server address information sent by the session management device SMF, the user plane function network element UPF verifies the target address information corresponding to the target message based on the pre-stored server address information, if the server address information and the target address information are consistent, the target message is transmitted, so that the identification efficiency and the accuracy of the related message are improved, the problem of packet loss of the message when the load of the user plane function network element is higher is avoided, and the success rate of key service data transmission and the user experience effect are improved.
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In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present application, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a 5G architecture according to an embodiment of the present application;
fig. 2 is a flow chart of a packet loss optimization method applied to a UPF of a 5G system according to an embodiment of the present application;
Fig. 3 is a schematic diagram of a P-CSCF server address IE format according to an embodiment of the present application;
fig. 4 is a schematic diagram of a session creation process according to an embodiment of the present application;
fig. 5 is a schematic diagram of a processing flow for identifying an uplink SIP message according to an embodiment of the present application;
fig. 6 is a schematic diagram of a processing flow for identifying a downlink SIP message according to an embodiment of the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The terms "first" and "second" and the like in this specification are used for distinguishing between different objects and not for describing a particular sequential order. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to the listed steps or elements but may include steps or elements not expressly listed.
The embodiment of the application provides a packet loss optimization method applied to a UPF (unified packet loss) of a 5G system, which is applied to a fifth generation communication system (5G), so that a user plane function network element can quickly identify a specific message interacted between user equipment and a proxy call server from a mass message, the problem of packet loss of the specific message is avoided, and the success rate of service data transmission is improved.
Referring to fig. 1, a schematic diagram of a 5G architecture is provided in an embodiment of the present application. The 5G architecture shown in fig. 1 includes an access management Function (ACCESS MANAGEMENT Function, AMF), a session management device (Session Management Function, SMF), and a user plane Function element (User Plane Function, UPF). The connection of the User plane is UE (User Equipment) to (R) AN (Radio Access Network) to UPF to DN (Data Network), the connection of the control plane is UE to AMF to SMF, the control plane and the User plane are separated structures, the UPF interacts with the SMF through AN N4 interface, and the UPF is directly controlled and managed by the SMF, and executes the processing of the service flow according to various strategies issued by the SMF. The N3 interface user plane messages are encapsulated using the general packet radio service tunneling protocol user plane (GENERAL PACKET Radio Service Tunnelling Protocol User Plane, GTP-U) protocol. GTP-U adopts user datagram protocol (User Datagram Protocol, UDP) protocol encapsulation, and the IP message head to which GTP-U belongs carries a source Internet protocol (Internet Protocol, IP) address and a destination IP address. Based on the IP route, the message is transmitted between the (R) AN and the UPF, so that a transmission channel is formed between the (R) AN and the UPF.
IMS (IP Multimedia Subsystem) is an IP network based multimedia communication system architecture that provides various multimedia services such as voice, video, data and real-time communications. The IMS system includes network elements such as serving call session control functions (SERVING CSCF (Call Session Control Function), S-CSCFs), interrogating call session control functions (Interrogating CSCF, I-CSCFs), proxy call session control functions (Proxy CSCFs, P-CSCFs), home subscription services (Home Subscriber Server, HSS). The P-CSCF acts as an entry point to the IMS network, is responsible for interacting with the UE, handling SIP signaling, and forwarding the request to the appropriate CSCF.
In a 5G network, the 5G core network needs to provide a P-CSCF server address for the UE to support IMS services. According to the 3GPP specification, the SMF receives a session establishment request message sent by the UE, and carries a P-CSCF server address in a session establishment response message sent to the UE. The UE then communicates with the P-CSCF via forwarding of (R) AN with UPF via a user plane data transfer path via SIP (Session Initiation Protocol) protocol for setup and management of IMS services.
When the UPF is in a high load state, the UPF can selectively discard the data packets of the low-priority or non-critical service so as to ensure the quality of the critical service and reduce the self load. For IMS services, SIP signaling interacted between the UE and the P-CSCF is a key signaling for controlling functions such as voice and video call of the UE. These signaling are critical to the proper functioning of IMS services. SIP signaling is generally regarded as a common data flow for UPF, but if the UPF erroneously discards these IMS service control signaling, it will have serious impact on IMS services, for example, it may cause the UE to fail to make a call, answer a call, or hang up a call, etc. Therefore, the embodiment of the application provides a packet loss optimization method applied to a UPF of a 5G system, which can prevent the UPF from discarding the corresponding IMS service control signaling or related messages. Among them, IMS (IP Multimedia Subsystem ) is a form of multimedia service based on an IP network, which aims to provide a more novel and diversified multimedia service experience to end customers through the IP network. SIP (Session Initiation Protocol) is a signaling protocol for controlling multimedia communication sessions, such as voice and video calls, multimedia conferences, and other interactive communications. SIP is defined by IETF (INTERNET ENGINEERING TASK Force) which uses syntax similar to HTTP and TCP or UDP as transport layer protocols based on a request/response model. The P-CSCF may be referred to as a proxy call session server, which is responsible for maintaining security associations between UEs and the P-CSCF and applying integrity and confidentiality protection for SIP signaling.
Referring to fig. 2, a flow chart of a packet loss optimization method applied to a 5G system UPF according to an embodiment of the present application is provided, where the method is applied to a user plane function network element UPF, and specifically the method may include the following steps:
s101, under the condition that the user equipment and the proxy call session server establish a communication session, a target message to be transmitted between the user equipment and the proxy call session server is obtained.
The UE may generate request information for establishing a data session with the proxy call session server P-CSCF, and send the request information to the session management device SMF, and then after receiving the request information of the UE, the SMF may read the server address information of the proxy call session server configured locally, and specifically may obtain the address of the primary and standby P-CSCF server. Then, the user equipment receives response information corresponding to the request information of the data session fed back by the SMF, where the response information carries a server address message of the proxy call session server. And also sends the server address information to the user plane function network element UPF.
Thus, after the user equipment establishes a communication session with the proxy call session server, the data session establishment described above is successful. The user equipment may start to use the IMS service, and at this time, the user equipment may perform packet transmission with the proxy call session server P-CSCF server, where a packet to be transmitted may be forwarded based on the user plane function network element UPF. The user plane function network element UPF obtains a target message to be transmitted between the user plane function network element UPF and the user equipment, wherein the target message can be an uplink message sent by the user equipment, and correspondingly, the target message can also be an uplink message sent by the user equipment for the proxy call session server. For example, when the target message is an uplink message, the uplink message is forwarded to the user plane function network element UPF through the base station.
S102, if the load of the UPF is higher than the target load threshold, analyzing the network communication address of the target message to obtain the target address information corresponding to the target message.
The target load threshold may be determined according to the current communication scenario, if the load of the UPF is higher than the target load threshold, which indicates that the UPF is in a high-load running state, to avoid the problems of packet loss, delay increase, and the like, the UPF needs to selectively discard some packets, but in order to ensure the quality of the critical service, the UPF needs to avoid discarding the SIP packet. Therefore, after the UPF obtains the target message, the network communication address of the target message is analyzed to obtain the corresponding target address information. The target address information is the target address information to be sent by the user equipment if the target message is an uplink message, and the target address information characterizes the source address information of the downlink message if the target message is a downlink message. For example, the IP header of the network communication address corresponding to the user equipment when sending the uplink message stores destination address information corresponding to the proxy call session server, so that the destination address information can be directly obtained from the IP header for subsequent verification.
And S103, if the target address information corresponding to the target message is consistent with the server address information prestored in the UPF, transmitting the target message.
After the UPF analyzes the IP header information of the target message to be transmitted to obtain the corresponding target address information, the target address information is compared with the P-CSCF server address stored by the UPF, if the comparison is successful, the current target message is determined to be the SIP message, so that the SIP message can be accurately identified based on the server address information carried in the message, and then the target message is transmitted. For example, when the target packet is an uplink packet, the uplink packet may be forwarded to the DN of the data network, so as to avoid erroneous discarding of the SIP packet. And if the target message is a downlink message sent to the user equipment by the proxy call session server and the target address information represents source address information of the downlink message, forwarding the downlink message to the user equipment if the source address information corresponding to the downlink message is consistent with the server address information prestored in the UPF. The method comprises the steps that corresponding server address information of a proxy call session server pre-stored in a UPF is sent by a session management device (SMF), the SMF is configured with the corresponding server address information, when User Equipment (UE) requests to establish a data session with the proxy call session server, the SMF receives request information of data session creation sent by the UE and then sends the configured server address information to the UE, and meanwhile, the server address information is sent to the UPF, so that the UPF can store the server address information for subsequent message verification.
In the embodiment of the application, the UPF equipment can acquire the address of the P-CSCF server used by the UE, thereby realizing the rapid and accurate identification of the SIP message. When the UPF is in a high-load state, the method can effectively avoid the SIP message from being discarded by mistake, thereby remarkably improving the service quality and the user experience of the IMS service.
In one implementation of the embodiment of the present application, the method further includes:
If the target address information corresponding to the target message is inconsistent with the server address information pre-stored in the UPF, determining the priority of the target message, and if the priority of the target message is lower than the target priority, discarding the target message and not transmitting the target message. Specifically, if the target message is an uplink message, the destination address information obtained by analyzing the uplink message is inconsistent with the server address information pre-stored in the UPF, which indicates that the current uplink message is not an SIP message, the priority of the current uplink message can be determined according to the normal message processing flow, if the priority is lower than the preset target priority, the uplink message is indicated to be a non-critical message, and if the uplink message is higher in UPF load, the uplink message can be discarded, i.e. the uplink messages are not transmitted to the corresponding data network any more.
In one implementation manner of the embodiment of the present application, when the target message is a downlink message sent to the user equipment by the proxy session server, the target address information characterizes source address information of the downlink message. And under the condition that the downlink message sent to the user equipment by the proxy call session server is received, analyzing the downlink message to obtain source address information corresponding to the downlink message, and if the source address information is consistent with the server address information prestored in the UPF, forwarding the downlink message to the user equipment. Specifically, for the downlink SIP messages sent to the UE by the P-CSCF server, when these messages reach the UPF, the UPF may compare the source address of the message with the P-CSCF server address stored by itself, so as to implement efficient and accurate SIP message identification, avoid discarding, and forward to the (R) AN and the UE correctly. The downstream message is analyzed, and mainly, the sending address corresponding to the downstream message is analyzed to determine the address information of the source server corresponding to the downstream message.
In one implementation of the embodiment of the present application, the method further includes:
and under the condition that the user equipment sends request information for creating the data session with the proxy call session server to a session management device (SMF), receiving response information for creating the data session sent by the SMF, and storing server address information which is carried by the response information and corresponds to the proxy call session server.
The session management means SMF communicates with the user plane function network element UPF based on PFCP (Packet Forwarding Control Protocol) packet forwarding control protocol described in 3gpp TS 29.244. The present application may add a field P-CSCF SERVER ADDRES (server address information) to a Session Establishment Request (session setup request) message of the PFCP protocol, and in particular this field may include information such as that an IE may exist to contain the P-CSCF server address. There may be multiple IEs with the same IE type to represent multiple P-CSCF server addresses. The order of the IEs in the message indicates priority, i.e. the first IE should contain the primary P-CSCF server address and the second IE should contain the alternate P-CSCF server address. In particular, the P-CSCF server address IE format may be seen in fig. 3.
Correspondingly, the embodiment of the application also provides a packet loss optimization method applied to the session management device SMF, which comprises the following steps:
Receiving request information of user equipment for creating a data session with a proxy call session server;
Determining server address information corresponding to the proxy call session server based on configuration information of the session management device SMF itself;
Transmitting request information carrying server address information corresponding to the proxy call session server to a user plane function network element UPF;
And in response to receiving response information of successful creation of the data session sent by the UPF, sending response information carrying server address information corresponding to the proxy call session server to the user equipment so as to establish the data session between the user equipment and the proxy call session server.
Specifically, please refer to fig. 4, which illustrates a session creation flow provided in an embodiment of the present application. The user equipment initiates a PDU session establishment request message to the network requesting creation of a new PDU session, wherein the PDU session is a data transmission channel for communication between the User Equipment (UE) and a Data Network (DN). After receiving the PDU session establishment request message of the user equipment UE, the SMF reads the local configuration to obtain the address of the primary and standby P-CSCF server. The SMF sends a PFCP session creation request message to the UPF, and adds a P-CSCF server address field in the message, carrying the obtained P-CSCF active server address and standby server address. After the UPF processes the session creation request, the UPF replies a PFCP session creation response message to the SMF, and confirms that the session creation is successful. The SMF replies PDU session establishment response information to the UE, wherein the information comprises the obtained primary server address and the standby server address of the P-CSCF, so that the UE can use the addresses to communicate with the P-CSCF.
Referring to fig. 5, a processing flow of identifying an uplink SIP message is provided in an embodiment of the present application. After the session creation process is completed, the UE may start using the IMS service. At this time, when the UE sends uplink SIP messages to the P-CSCF server, these messages are forwarded to the UPF through the base station. When UPF is in high load, the target address of the message can be compared with the P-CSCF server address stored by the UPF, so that the SIP message can be identified more quickly and accurately, the error discarding of the SIP message is avoided, and the SIP message is forwarded to DN correctly.
Referring to fig. 6, a processing flow of identifying a downlink SIP message is provided in an embodiment of the present application. For the downlink SIP messages sent to the UE by the P-CSCF server, when the messages reach the UPF, the UPF can compare the source address of the messages with the address of the P-CSCF server stored by the UPF so as to realize efficient and accurate SIP message identification, avoid discarding and correctly forward to the (R) AN and the UE.
It should be noted that, in the embodiment of the present application, the message interaction between the UE and the SMF needs to be actually transferred through the base station and the AMF, and this portion is not shown in fig. 1, but only the main data interaction process is shown in the relevant drawings. The message interaction between the UE and the SMF, and between the SMF and the UPF, the manner or field form of carrying the P-CSCF server address in the message may also be other modes, which is not limited by the present application. The application provides a packet loss optimization method aiming at a UPF high load condition in a 5G system. The method can realize the rapid and accurate identification of the SIP message by enabling the UPF equipment to acquire the address of the P-CSCF server used by the UE. When the UPF is in a high-load state, the method can effectively avoid the SIP message from being discarded by mistake, thereby remarkably improving the service quality and the user experience of the IMS service.
Based on the foregoing embodiments, an embodiment of the present application further provides a user plane functional network element, including:
The first acquisition unit is used for acquiring a target message to be transmitted between the user equipment and the proxy call session server under the condition that the user equipment and the proxy call session server establish a communication session;
The first analyzing unit is used for analyzing the network communication address of the target message to obtain target address information corresponding to the target message if the load of the user plane function network element is higher than a target load threshold;
And the transmission unit is used for transmitting the target message if the target address information corresponding to the target message is consistent with the server address information pre-stored by the user plane function network element.
Optionally, the user plane functional network element further includes:
A first determining unit, configured to determine a priority of the target packet if target address information corresponding to the target packet is inconsistent with server address information pre-stored by the user plane function network element;
The message discarding processing unit is used for discarding the target message and not transmitting the target message if the priority of the target message is lower than the target priority;
And the storage unit is used for receiving response information for creating the data session sent by the SMF and storing server address information corresponding to the proxy call session server, which is carried by the response information, under the condition that the user equipment sends request information for creating the data session with the proxy call session server to the session management device SMF.
Optionally, the user plane functional network element further includes:
a first transmission subunit, configured to, if the target address information of the uplink packet is consistent with the server address information pre-stored in the user plane function network element, transmit the uplink packet to a data network when the target packet is the uplink packet sent by the user equipment;
And the second transmission subunit is used for forwarding the downlink message to the user equipment if the source address information corresponding to the downlink message is consistent with the server address information pre-stored by the user plane function network element under the condition that the target message is the downlink message sent to the user equipment by the proxy call session server.
The embodiment of the application also provides a session management device, which comprises:
A second receiving unit, configured to receive request information for creating a data session with a proxy call session server by a user equipment;
A second determining unit configured to determine server address information corresponding to the proxy call session server based on configuration information of the session management apparatus itself;
a first sending unit, configured to send request information carrying server address information corresponding to the proxy call session server to a user plane function network element UPF;
And the second sending unit is used for responding to the received response information of successful creation of the data session sent by the UPF and sending the response information carrying the server address information corresponding to the proxy call session server to the user equipment so as to realize the establishment of the data session between the user equipment and the proxy call session server.
The embodiment of the application also provides a communication system which comprises the user plane function network element, the user equipment and the session management device, wherein the user equipment establishes communication connection with the proxy call session server based on the user plane function network element and the session management device. In particular, the implementation of the relevant devices in the communication system may be referred to in the description of the above embodiments, which is not described in detail herein.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
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