CN110582086B - Session line switching method and system - Google Patents
Session line switching method and system Download PDFInfo
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- CN110582086B CN110582086B CN201910865084.8A CN201910865084A CN110582086B CN 110582086 B CN110582086 B CN 110582086B CN 201910865084 A CN201910865084 A CN 201910865084A CN 110582086 B CN110582086 B CN 110582086B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W12/00—Security arrangements; Authentication; Protecting privacy or anonymity
- H04W12/06—Authentication
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
- H04W36/0033—Control or signalling for completing the hand-off for data sessions of end-to-end connection with transfer of context information
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Abstract
The invention discloses a method and a system for switching conversation lines. The method comprises the following steps: when the terminal is based on a first network, a session is carried out with a session opposite terminal through a first user plane functional entity, and the current signal quality of the terminal is lower than a preset quality threshold, the terminal is based on a non-3GPP network, and is accessed to the first network through a non-3GPP interoperation functional entity; the terminal responds to an access success message returned by the non-3GPP interoperation functional entity and establishes a data connection relation with a second user plane functional entity corresponding to the first network; the terminal sends a conversation line switching request to a first conversation management functional entity corresponding to a first network; the first session management functional entity interacts with a second session management functional entity corresponding to the first network according to the session line switching request to complete the switching of the session context; and the first user plane functional entity interacts with the second user plane functional entity to complete the switching of the conversation line.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method and a system for switching a session line.
Background
At present, when an end user makes a call through a terminal (such as a mobile phone), the situation that a sound is interrupted or the call is disconnected due to poor call signals is often encountered, and at this time, the end user generally needs to move around to try to find a position with better network signal coverage so as to keep the call in normal operation, which results in poor user experience.
Therefore, how to ensure smooth call of the user when the call signal is not good so as to improve the experience of the user becomes a technical problem to be solved urgently at present.
Disclosure of Invention
The present invention is directed to at least one of the technical problems in the prior art, and provides a method and a system for switching a session line.
In order to achieve the above object, the present invention provides a method for switching a session line, where when a terminal performs a session with an opposite session terminal through a first user plane function entity connected correspondingly based on a first network, the method for switching the session line includes:
when the current signal quality of the terminal is lower than a preset quality threshold value, the terminal is accessed to a first network through a non-3GPP interoperation functional entity based on a non-3GPP network;
the terminal responds to an access success message returned by the non-3GPP interoperation functional entity, and establishes a data connection relation with a second user plane functional entity corresponding to the first network;
the terminal sends a session line switching request to a first session management functional entity corresponding to the first network;
the first session management functional entity interacts with a second session management functional entity corresponding to the first network according to the session line switching request to complete the switching of the session context;
and the first user plane functional entity interacts with the second user plane functional entity to complete the switching of the conversation line.
Optionally, when the current signal quality of the terminal is lower than the preset quality threshold, before the step of accessing, by the terminal through the non-3GPP interworking function entity, the first network based on the non-3GPP network, the method further includes: and the terminal detects whether the current signal quality of the terminal is lower than a preset quality threshold value.
Optionally, the accessing, by the terminal, the first network through the non-3GPP interworking function entity based on the non-3GPP network includes:
the terminal sends a first network access request to the non-3GPP interoperation functional entity based on a non-3GPP network, wherein the first network access request comprises a terminal identifier and a user hidden identifier of the terminal;
the non-3GPP interoperation functional entity sends a terminal authentication request to a unified data management entity, wherein the terminal authentication request comprises a terminal identifier and a user hidden identifier of the terminal;
the non-3GPP interoperation functional entity responds to authentication success information returned by the unified data management entity, and interacts with a second access and mobile management functional entity, a second session management functional entity and a second user plane functional entity corresponding to the first network, so that the terminal is accessed to the first network;
and the non-3GPP interoperation functional entity returns the access success message to the terminal.
Optionally, the first user plane functional entity interacts with the second user plane functional entity, and after the session line switching is completed, the method further includes:
the first session management functional entity sends a message that the session line is switched to a first access and mobile management functional entity corresponding to the first network;
the first access and mobile management functional entity sends a command of releasing wireless link resources to a base station currently connected with the terminal according to the switched message of the session line;
and the base station interacts with the terminal according to the command of releasing the wireless link resource so as to release the wireless link resource of the terminal.
Optionally, the session line switching request includes an entry address of the second session management function entity;
the first session management functional entity interacts with a second session management functional entity corresponding to the first network according to the session line switching request to complete the switching of the session context, and the method comprises the following steps: and the first session management functional entity interacts with the second session management functional entity corresponding to the entry address according to the entry address to complete the switching of the session context.
In order to achieve the above object, the present invention further provides a session line switching system, which includes a terminal, a first user plane functional entity corresponding to a first network, a non-3GPP interworking functional entity, a second user plane functional entity corresponding to the first network, a first session management functional entity corresponding to the first network, and a second session management functional entity corresponding to the first network;
the terminal is used for carrying out conversation with a conversation opposite terminal through a first user plane functional entity correspondingly connected on the basis of a first network at present, and accessing the first network through a non-3GPP interoperation functional entity on the basis of a non-3GPP network when the current signal quality of the terminal is lower than a preset quality threshold; responding to an access success message returned by a non-3GPP interoperation functional entity, and establishing a data connection relation with a second user plane functional entity corresponding to the first network; sending a session line switching request to a first session management functional entity corresponding to the first network;
the first session management functional entity is used for interacting with a second session management functional entity corresponding to the first network according to the session line switching request to complete the switching of the session context;
and the first user plane functional entity is used for interacting with the second user plane functional entity to complete the switching of the conversation line.
Optionally, the terminal is further configured to detect whether the current signal quality of the terminal is lower than a preset quality threshold, based on the non-3GPP network, before accessing the first network through the non-3GPP interworking function entity.
Optionally, the terminal further includes a unified data management entity and a second access and mobility management function entity corresponding to the first network, where the terminal is specifically configured to send a first network access request to the non-3GPP interworking function entity based on the non-3GPP network, where the first network access request includes a terminal identifier and a user hidden identifier of the terminal;
the non-3GPP interoperation functional entity is used for sending a terminal authentication request to the unified data management entity, wherein the terminal authentication request comprises a terminal identifier and a user hidden identifier of the terminal; responding to authentication success information returned by the unified data management entity, and interacting with a second access and mobile management functional entity, a second session management functional entity and a second user plane functional entity corresponding to the first network to enable the terminal to access the first network; and returning the access success message to the terminal.
Optionally, the mobile terminal further includes a base station to which the terminal is currently connected and a first access and mobility management function entity corresponding to the first network;
the first session management functional entity is also used for sending a message that the session line is switched to a first access and mobile management functional entity corresponding to the first network;
the first access and mobile management functional entity is used for sending a command of releasing wireless link resources to the base station according to the switched session line message;
and the base station is used for interacting with the terminal according to the command for releasing the wireless link resource so as to release the wireless link resource of the terminal.
Optionally, the session line switching request includes an entry address of the second session management function entity;
the first session management function entity is specifically configured to interact with the second session management function entity corresponding to the entry address according to the entry address, so as to complete switching of a session context.
The invention has at least the following beneficial effects:
in the technical scheme of the session line switching method and system provided by the invention, when the terminal is currently based on the first network, when the session is carried out with the opposite session terminal through the correspondingly connected user plane functional entity and the current signal quality of the terminal is lower than the preset quality threshold value, the terminal is based on the non-3GPP network, the non-3GPP interworking function entity is accessed to a first network, and establishes a data connection relation with a second user plane function entity corresponding to the first network, and through the first session management function entity and the second session management function entity of the first network, the second user plane function entity of the first network replaces the first user plane function entity of the first network to carry the session, and complete the switching of the session line, and then, the terminal can perform data interaction with the second user plane functional entity through the non-3GPP network to realize the session with the opposite terminal of the session, thereby improving the user experience.
Drawings
Fig. 1 is a flowchart of a session line switching method according to an embodiment of the present invention;
fig. 2 is a flowchart of a session line switching method according to a second embodiment of the present invention;
fig. 3 is a flowchart of a session line switching method according to a third embodiment of the present invention;
fig. 4 is a schematic structural diagram of a session line switching system according to a fourth embodiment of the present invention.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the following describes in detail the session line switching method and system provided by the present invention with reference to the accompanying drawings.
Fig. 1 is a flowchart of a session line switching method according to an embodiment of the present invention, and as shown in fig. 1, when a terminal performs a session with a session peer end through a first user plane function entity connected correspondingly based on a first network, the session line switching method includes:
and step 11, when the current signal quality of the terminal is lower than a preset quality threshold, the terminal accesses the first network through a non-3GPP interoperation functional entity based on the non-3GPP network.
And step 12, the terminal responds to the access success message returned by the non-3GPP interoperation functional entity and establishes a data connection relation with a second user plane functional entity corresponding to the first network.
And step 13, the terminal sends a session line switching request to a first session management functional entity corresponding to the first network.
And step 14, the first session management functional entity interacts with a second session management functional entity corresponding to the first network according to the session line switching request to complete the switching of the session context.
And step 15, the first user plane functional entity interacts with the second user plane functional entity to complete the switching of the conversation line.
In the method for switching session lines provided in this embodiment, when the terminal currently performs a session with the opposite session terminal through the corresponding connected user plane function entity based on the first network, and the current signal quality of the terminal is lower than the preset quality threshold, the terminal is based on the non-3GPP network, the non-3GPP interworking function entity is accessed to a first network, and establishes a data connection relation with a second user plane function entity corresponding to the first network, and through the first session management function entity and the second session management function entity of the first network, the second user plane function entity of the first network replaces the first user plane function entity of the first network to carry the session, and complete the switching of the session line, and then, the terminal can perform data interaction with the second user plane functional entity through the non-3GPP network to realize the session with the opposite terminal of the session, thereby improving the user experience.
Fig. 2 is a flowchart of a session line switching method according to a second embodiment of the present invention, and as shown in fig. 2, when a terminal performs a session with a session peer end through a first user plane function entity connected correspondingly based on a first network, the session line switching method includes:
and 21, the terminal detects whether the current signal quality of the terminal is lower than a preset quality threshold, if so, the step 22 is executed, and otherwise, the process is ended.
In this embodiment, when a terminal (User Equipment, abbreviated as UE) performs a session with a session peer through a first User Plane Function (UPF) connected correspondingly based on a first network, the terminal (UE) detects whether the current signal quality of the terminal is lower than a preset quality threshold, if so, executes step 22, otherwise, ends the procedure. The current signal quality of the terminal may also be referred to as the signal quality of the current session or the signal quality of the currently accessed first network, or the current wireless signal quality. The first network may be a mobile communication network, such as a 5G network, a 4G network, or a 3G network. Preferably, the first network is a 5G network.
In this embodiment, the terminal may detect whether the current signal quality of the terminal is lower than the preset quality threshold through the network, and when the current signal quality of the terminal is detected to be lower than the preset quality threshold, it indicates that the current signal quality of the terminal is lower than the minimum requirement for maintaining a normal session, and a situation that a session between the terminal and the opposite terminal is interrupted by sound or disconnected by the session may occur, so that step 22 and subsequent steps are executed to perform session line switching, thereby ensuring smooth session of the terminal. And when the current signal quality of the terminal is detected to be higher than or equal to the preset quality threshold, the current signal quality of the terminal can maintain the normal conversation with the opposite end of the conversation, so the process is ended. The preset quality threshold is specifically determined according to the minimum requirement for actually maintaining a normal session, which is not limited in this embodiment.
In this embodiment, the session may be an audio call, a video call, or the like.
And step 22, the terminal accesses the first network through the non-3GPP interoperation functional entity based on the non-3GPP network.
In this embodiment, the non-third Generation Partnership Project (3rd Generation Partnership Project, 3GPP) Network may be a Wireless Network (Wireless Network), such as Wireless broadband (Wifi) or Worldwide Interoperability for Microwave Access (WiMAX). Preferably, the non-3GPP network is a Wifi network.
It should be noted that, when it is detected that the current signal quality of the terminal is lower than the preset quality threshold, if the terminal has no available non-3GPP network connection, the procedure is ended.
Specifically, step 22 includes:
step 221, the terminal sends a first network access request to the non-3GPP interworking function entity based on the non-3GPP network, where the first network access request includes a terminal identifier and a user hidden identifier of the terminal.
In this embodiment, when the terminal detects that the current signal quality of the terminal is lower than a preset quality threshold, a first network access request is sent to a Non-3GPP InterWorking Function (N3IWF) based on a Non-3GPP network to request to access a core network of a first network (e.g., a 5G network) through the Non-3GPP network, where the first network access request includes a terminal identifier and a hidden user identifier of the terminal.
The terminal Identifier of the terminal may be a 5G Temporary Mobile Subscriber Identifier (TMSI) of the terminal, and the user hidden Identifier may be a hidden Identifier of the terminal(Subscription qualified Identifier: SUCI) is preset secret key KAMF1Signature encryption of ciphertext (SUPI) of user Permanent Identifier (SUCI) can be understood as being K-passAMF1Encrypted SUPI, KAMF1A key generated in advance by a first Access and Mobility Management Function (AMF) entity corresponding to a first network currently providing services for a terminal.
Step 222, the non-3GPP interworking function entity sends a terminal authentication request to the unified data management entity, where the terminal authentication request includes a terminal identifier of the terminal and a user hidden identifier.
Step 223, the unified data management entity sends the user hidden identifier to the first access and mobility management function entity corresponding to the terminal identifier according to the terminal identifier of the terminal.
Specifically, a Unified Data Management entity (UDM) extracts an identifier of a first access and mobility Management function entity (AMF) according to information in a terminal identifier (such as 5G-TMSI) of a terminal, and sends the information to the first access and mobility Management function entity (AMF) corresponding to the identifierAMF1The signed user hides the identity (SUCI).
And 224, the first access and mobility management functional entity verifies the signature of the user hidden identifier and returns the verification result to the unified data management entity.
And step 225, when the verification result is that the authentication is passed, the unified data management entity returns authentication success information to the non-3GPP interoperation functional entity.
Step 226, the non-3GPP interworking function entity responds to the authentication success information returned by the unified data management entity, and interacts with the second access and mobility management function entity, the second session management function entity and the second user plane function entity corresponding to the first network, so that the terminal accesses the first network.
In this embodiment, in the access process, the non-3GPP interworking function entity selects a second access and mobility management function entity (AMF) for the terminal to access, the second access and mobility management function entity (AMF) allocates a second session management function entity (SMF) to the terminal, and the second session management function entity (SMF) allocates a second user plane function entity (UPF) to the terminal.
Step 227, the non-3GPP interworking function entity returns an access success message to the terminal.
The access success message may include information of a second access and mobility management functional entity in the first network selected to be accessed by the non-3GPP interworking functional entity, a second session management functional entity allocated by the second access and mobility management functional entity, and a second user plane functional entity allocated by the second session management functional entity.
To this end, the terminal has successfully accessed the first network through the non-3GPP network.
And step 23, the terminal responds to the access success message returned by the non-3GPP interoperation functional entity, and establishes a data connection relation with a second user plane functional entity corresponding to the first network.
Specifically, the terminal (UE) responds to an access success message returned by the non-3GPP interworking function entity (N3IWF), and interacts with a second user plane function entity (UPF) corresponding to the first network based on the non-3GPP network (e.g., Wifi), so as to establish a data connection relationship.
And step 24, the terminal sends a session line switching request to the first session management functional entity corresponding to the first network.
In this embodiment, a terminal (UE) sends a Session Management Function (SMF) request to a first SMF corresponding to a first network, where the Session Management Function request includes a pre-acquired entry address of a second SMF corresponding to the first network. Specifically, after accessing a first network (e.g. a 5G network) through a non-3GPP network, the terminal (UE) may obtain an entry address of a second session management function entity (SMF) through an access success message returned by the non-3GPP interworking function entity (N3 IWF).
And step 25, the first session management functional entity interacts with a second session management functional entity corresponding to the first network according to the session line switching request to complete the switching of the session context.
Specifically, step 25 includes: and the first session management functional entity interacts with the second session management functional entity corresponding to the entry address according to the entry address to complete the switching of the session context.
Specifically, a first session management function entity (SMF) sends context information to a second session management function entity (SMF), wherein the context information comprises a connection relation parameter between a first user plane function entity (UPF) and a session opposite terminal. When the first session management function entity (SMF) sends the context information to the second session management function entity (SMF), the first session management function entity (SMF) negotiates with the second session management function entity (SMF) to decide whether the first user plane function entity (UPF) actively initiates the connection to the second user plane function entity (UPF) or the second user plane function entity (UPF) actively initiates the connection to the first user plane function entity (UPF).
After the negotiation is finished, if the negotiation result is that the first user plane functional entity (UPF) actively initiates connection to the second user plane functional entity (UPF), the first session management functional entity (SMF) sends the negotiation result to the first user plane functional entity (UPF), triggers the first user plane functional entity (UPF) to actively initiate connection to the second user plane functional entity (UPF), and meanwhile, the second user plane functional entity (UPF) creates a Uniform Resource Locator (URL) and waits for the first user plane functional entity (UPF) to connect; if the negotiation result is that the second user plane function entity (UPF) actively initiates connection to the first user plane function entity (UPF), the second session management function entity (SMF) sends the negotiation result to the second user plane function entity (UPF), triggers the second user plane function entity (UPF) to actively initiate connection to the first user plane function entity (UPF), and simultaneously, the first user plane function entity (UPF) creates a Uniform Resource Locator (URL) and waits for the second user plane function entity (UPF) to connect.
And 26, interacting the first user plane functional entity and the second user plane functional entity to complete the switching of the conversation line.
Specifically, in response to a negotiation result of the first session management function entity (SMF) and the second session management function entity (SMF), the first user plane function entity (UPF) and the second user plane function entity (UPF) interact with each other to establish a data connection relationship, and complete session line switching.
Since the execution of steps 25 and 26 requires a certain procedure, during which the terminal (UE) and the session peer still need to perform data (e.g. audio data, video data) interaction through the first user plane function entity (UPF) when performing a session, the data may not be correctly delivered to the terminal and/or the session peer due to the ongoing data handover between the first user plane function entity (UPF) and the second user plane function entity (UPF), and at this time, the first user plane function entity (UPF) needs to buffer the data locally. After the first user plane functional entity (UPF) and the second user plane functional entity (UPF) establish a data connection relationship, the first user plane functional entity (UPF) can forward the data to the second user plane functional entity (UPF), and then the second user plane functional entity (UPF) forwards the data to the terminal and/or the opposite session end, and then the session between the terminal and the opposite session end is carried by the second user plane functional entity (UPF), thereby completing the session line switching.
In this embodiment, after forwarding all data to the second user plane functional entity (UPF), the first user plane functional entity (UPF) disconnects the data connection relationship with the second user plane functional entity (UPF).
In this embodiment, a data connection relationship is established between a terminal (UE) and a second user plane functional entity (UPF), a session context is switched between the first session management functional entity (SMF) and the second session management functional entity (SMF), the first user plane functional entity (UPF) and the second user plane functional entity (UPF) perform interaction and forward cached session data, indicating that a session line is switched, the terminal (UE) may interact with the second user plane functional entity (UPF) through a non-3GPP network, and send the session data to the second user plane functional entity (UPF), the second user plane functional entity (UPF) then sends the session data from the terminal to a session peer, and the session peer may also send the session data to the terminal through the second user plane functional entity (UPF), thereby implementing a session between the terminal and the session peer.
It can be understood that, before the session line is switched, the terminal (UE) performs a session with the opposite session end through a first User Plane Function (UPF) corresponding to the connection based on a first network (e.g. a mobile communication network); and) after the session line is switched, the terminal (UE) performs data interaction through the second user plane functional entity (UPF) connected correspondingly based on the non-3GPP network (e.g., Wifi), and the second user plane functional entity (UPF) performs data interaction with the opposite session terminal, so as to implement the session between the terminal (UE) and the opposite session terminal until the terminal is disconnected from the non-3GPP network.
In this embodiment, the capability of the first network (e.g. 5G network) to allow the non-3GPP entity (e.g. non-3GPP interworking function entity) to access may be utilized, when the terminal detects that the signal quality of the first network (e.g. mobile communication network) where the terminal is currently located is not good, and when the terminal currently has an available non-3GPP network to be connectable, the terminal triggers to switch the session line of the terminal based on the first network to the session line based on the non-3GPP network, so as to implement the session line switching of the terminal in the session.
In an application scenario, because signal quality coverage of mobile communication networks in places such as shopping malls and office buildings is usually poor, or because users in the places such as the commercial buildings are dense, a situation that a plurality of terminals contend for wireless link resources at the same time occurs, so that part of users cannot obtain good service experience. However, usually, many commercial buildings are provided with a free wireless network (Wifi), when a terminal is in the commercial building and performs a session based on a mobile communication network, the current signal quality is not good, and the terminal is connected to the wireless network (Wifi) provided by the commercial building, the session line switching method provided by the embodiment can be used to implement switching of the session line of the current session of the terminal, thereby ensuring the session quality of the session of the terminal and improving the user experience.
In the method for switching session lines provided in this embodiment, when the terminal currently performs a session with the opposite session terminal through the corresponding connected user plane function entity based on the first network, and the current signal quality of the terminal is lower than the preset quality threshold, the terminal is based on the non-3GPP network, the non-3GPP interworking function entity is accessed to a first network, and establishes a data connection relation with a second user plane function entity corresponding to the first network, and through the first session management function entity and the second session management function entity of the first network, the second user plane function entity of the first network replaces the first user plane function entity of the first network to carry the session, and complete the switching of the session line, and then, the terminal can perform data interaction with the second user plane functional entity through the non-3GPP network to realize the session with the opposite terminal of the session, thereby improving the user experience.
Fig. 3 is a flowchart of a session line switching method according to a third embodiment of the present invention, where in this embodiment, a signal quality of a terminal (UE) is poor, and is usually caused by that a radio signal quality of a current location is not good, or may be caused by that multiple terminals in the current location contend for radio link resources at the same time. Therefore, in order to indirectly improve the network service (session) quality of other terminals at the current location, the radio link resource of the terminal having completed the session line switching can be released, so that the network service (session) quality of other terminals can be indirectly improved. The present embodiment is different from the second embodiment in that: in this embodiment, as shown in fig. 3, after step 26, the method further includes:
and 27, the first session management functional entity sends the message that the session line is switched to the first access and mobility management functional entity corresponding to the first network.
In this embodiment, the first access and mobility management function entity (AMF) sends a release radio link resource command to the base station to which the terminal is currently connected according to the session leg switched message, so as to command the base station to release the radio link resource of the terminal (UE) that has completed the session leg switch.
In this embodiment, the base station may be a 5G base station (5G Node B, abbreviated as gNB).
And step 29, the base station interacts with the terminal according to the command of releasing the wireless link resource so as to release the wireless link resource of the terminal.
In this embodiment, the base station interacts with the terminal according to the command for releasing the radio link resource to release the radio link resource of the terminal, so as to disconnect the connection relationship between the terminal (UE) and the first user plane function entity (UPF) based on the first network.
In addition, for other specific descriptions of this embodiment, reference may be made to the description of the second embodiment, which is not repeated herein.
In the method for switching session lines provided in this embodiment, when the terminal currently performs a session with the opposite session terminal through the corresponding connected user plane function entity based on the first network, and the current signal quality of the terminal is lower than the preset quality threshold, the terminal is based on the non-3GPP network, the non-3GPP interworking function entity is accessed to a first network, and establishes a data connection relation with a second user plane function entity corresponding to the first network, and through the first session management function entity and the second session management function entity of the first network, the second user plane function entity of the first network replaces the first user plane function entity of the first network to carry the session, and complete the switching of the session line, and then, the terminal can perform data interaction with the second user plane functional entity through the non-3GPP network to realize the session with the opposite terminal of the session, thereby improving the user experience.
Fig. 4 is a schematic structural diagram of a session line switching system according to a fourth embodiment of the present invention, and as shown in fig. 4, the session line switching system includes: a terminal 301, a first user plane functional entity 302 corresponding to a first network, a non-3GPP interworking functional entity 303, a second user plane functional entity 304 corresponding to the first network, a first session management functional entity 305 corresponding to the first network, and a second session management functional entity 306 corresponding to the first network.
The terminal 301 is configured to, when the terminal is currently based on a first network and performs a session with a session peer through a first user plane function entity 302 correspondingly connected to the terminal, and the current signal quality of the terminal 301 is lower than a preset quality threshold, access the first network through a non-3GPP interworking function entity 303 based on a non-3GPP network; responding to an access success message returned by the non-3GPP interoperability functional entity 303, and establishing a data connection relation with a second user plane functional entity 304 corresponding to the first network; and sends a session line switching request to the first session management function entity 305 corresponding to the first network.
The first session management functional entity 305 is configured to interact with a second session management functional entity 306 corresponding to the first network according to the session line switching request, so as to complete switching of the session context.
The first user plane functional entity 302 is configured to interact with the second user plane functional entity 304 to complete the session line switching.
Optionally, the terminal 301 is further configured to detect whether the current signal quality of the terminal 301 is lower than a preset quality threshold, based on the non-3GPP network, before accessing the first network through the non-3GPP interworking function entity 303.
Optionally, the session line switching system further includes a unified data management entity 307 and a second access and mobility management functional entity 308 corresponding to the first network, where the terminal 301 is specifically configured to send a first network access request to the non-3GPP interworking functional entity 303 based on the non-3GPP network, where the first network access request includes a terminal identifier and a user hidden identifier of the terminal 301.
The non-3GPP interworking function entity 303 is configured to send a terminal authentication request to the unified data management entity 307, where the terminal authentication request includes a terminal identifier of the terminal and a user hidden identifier; in response to the authentication success information returned by the unified data management entity 307, interacting with a second access and mobility management functional entity 308, a second session management functional entity 306 and a second user plane functional entity 304 corresponding to the first network, so as to enable the terminal 301 to access the first network; an access success message is returned to the terminal 301.
Optionally, the session line switching system further includes a base station 309 to which the terminal 301 is currently connected and a first access and mobility management function 310 corresponding to the first network.
The first session management function entity 305 is further configured to send a session leg switched message to the corresponding first access and mobility management function entity 310 of the first network. The first access and mobility management function 310 is configured to send a release radio link resource command to the base station 309 according to the session leg switched message. The base station 309 is configured to interact with the terminal 301 according to the release radio link resource command, so as to release the radio link resource of the terminal 301.
Optionally, the session line switching request includes an entry address of the second session management function entity 306; the first session management functional entity 305 is specifically configured to interact with the second session management functional entity 306 corresponding to the entry address according to the entry address, so as to complete the switching of the session context.
In addition, the session line switching system provided in this embodiment is used to implement the session line switching method provided in the first embodiment or the second embodiment, and specific descriptions may refer to the descriptions in the first embodiment or the second embodiment, which are not described herein again.
In the session line switching system provided in this embodiment, when the terminal is currently performing a session with the opposite session terminal through the corresponding connected user plane functional entity based on the first network and the current signal quality of the terminal is lower than the preset quality threshold, the session management functional entity may send a session line switching instruction to the terminal and the user plane functional entity, respectively, so that the terminal may establish a data connection relationship with the preset application functional entity through the available first network and the user plane functional entity may establish a data connection relationship with the preset application functional entity, so that the session line is switched from the session line based on the first network whose current signal quality is lower than the preset quality threshold to the session line based on the available first network, and further, the terminal may interact with the preset application functional entity through the first network and then interact with the user plane functional entity through the preset application functional entity, and the user plane functional entity interacts with the session opposite terminal to realize the session between the terminal and the session opposite terminal, thereby improving the user experience.
It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.
Claims (8)
1. A method for switching session line is characterized in that when a terminal carries out a session with a session opposite terminal through a first user plane functional entity correspondingly connected based on a first network, the method for switching session line comprises the following steps:
when the current signal quality of the terminal is lower than a preset quality threshold value, the terminal accesses the first network through a non-3GPP interoperation functional entity based on the non-3GPP network;
the terminal responds to an access success message returned by the non-3GPP interoperation functional entity, and establishes a data connection relation with a second user plane functional entity corresponding to the first network;
the terminal sends a session line switching request to a first session management functional entity corresponding to the first network;
the first session management functional entity interacts with a second session management functional entity corresponding to the first network according to the session line switching request to complete the switching of the session context;
the first user plane functional entity interacts with the second user plane functional entity to complete the switching of the conversation line;
the terminal accesses the first network through a non-3GPP interoperation functional entity based on a non-3GPP network, and comprises the following steps:
the terminal sends a first network access request to the non-3GPP interoperation functional entity based on a non-3GPP network, wherein the first network access request comprises a terminal identifier and a user hidden identifier of the terminal;
the non-3GPP interoperation functional entity sends a terminal authentication request to a unified data management entity, wherein the terminal authentication request comprises a terminal identifier and a user hidden identifier of the terminal;
the unified data management entity sends the user hidden identification to a first access and mobile management functional entity corresponding to the terminal identification according to the terminal identification of the terminal;
the first access and mobile management functional entity verifies the signature of the user hidden identifier and returns a verification result to the unified data management entity;
when the verification result is that the authentication is passed, the unified data management entity returns authentication success information to the non-3GPP interoperation functional entity;
the non-3GPP interoperation functional entity responds to authentication success information returned by the unified data management entity, and interacts with a second access and mobile management functional entity, a second session management functional entity and a second user plane functional entity corresponding to the first network, so that the terminal is accessed to the first network;
and the non-3GPP interoperation functional entity returns the access success message to the terminal.
2. The method according to claim 1, wherein before the step of accessing the first network through the non-3GPP interworking function entity based on the non-3GPP network when the current signal quality of the terminal is lower than the preset quality threshold, the method further comprises: and the terminal detects whether the current signal quality of the terminal is lower than a preset quality threshold value.
3. The method according to claim 1, wherein the first user plane function entity interacts with the second user plane function entity, and after the session line switching is completed, the method further comprises:
the first session management functional entity sends a message that the session line is switched to a first access and mobile management functional entity corresponding to the first network;
the first access and mobile management functional entity sends a command of releasing wireless link resources to a base station currently connected with the terminal according to the switched message of the session line;
and the base station interacts with the terminal according to the command of releasing the wireless link resource so as to release the wireless link resource of the terminal.
4. The session leg switching method according to claim 1, wherein the session leg switching request includes an entry address of the second session management function entity;
the first session management functional entity interacts with a second session management functional entity corresponding to the first network according to the session line switching request to complete the switching of the session context, and the method comprises the following steps: and the first session management functional entity interacts with the second session management functional entity corresponding to the entry address according to the entry address to complete the switching of the session context.
5. A conversation line switching system is characterized by comprising a terminal, a first user plane functional entity corresponding to a first network, a non-3GPP interoperation functional entity, a second user plane functional entity corresponding to the first network, a first conversation management functional entity corresponding to the first network and a second conversation management functional entity corresponding to the first network;
the terminal is used for carrying out conversation with a conversation opposite terminal through a first user plane functional entity correspondingly connected on the basis of a first network at present, and accessing the first network through a non-3GPP interoperation functional entity on the basis of a non-3GPP network when the current signal quality of the terminal is lower than a preset quality threshold; responding to an access success message returned by a non-3GPP interoperation functional entity, and establishing a data connection relation with a second user plane functional entity corresponding to the first network; sending a session line switching request to a first session management functional entity corresponding to the first network;
the first session management functional entity is used for interacting with a second session management functional entity corresponding to the first network according to the session line switching request to complete the switching of the session context;
the first user plane functional entity is used for interacting with the second user plane functional entity to complete the switching of the conversation line;
the session line switching system further comprises a unified data management entity, a first access and mobility management function entity corresponding to the terminal identifier, and a second access and mobility management function entity corresponding to the first network, wherein the terminal is specifically configured to send a first network access request to the non-3GPP interworking function entity based on the non-3GPP network, and the first network access request includes the terminal identifier and the user hidden identifier of the terminal;
the non-3GPP interoperation functional entity is used for sending a terminal authentication request to the unified data management entity, wherein the terminal authentication request comprises a terminal identifier and a user hidden identifier of the terminal; the unified data management entity sends the user hidden identification to a first access and mobile management functional entity corresponding to the terminal identification according to the terminal identification of the terminal; the first access and mobile management functional entity verifies the signature of the user hidden identifier and returns a verification result to the unified data management entity; when the verification result is that the authentication is passed, the unified data management entity returns authentication success information to the non-3GPP interoperation functional entity; responding to authentication success information returned by the unified data management entity, and interacting with a second access and mobile management functional entity, a second session management functional entity and a second user plane functional entity corresponding to the first network to enable the terminal to access the first network; and returning the access success message to the terminal.
6. The system according to claim 5, wherein the terminal is further configured to detect whether the current signal quality of the terminal is lower than the preset quality threshold value based on the non-3GPP network before accessing the first network through the non-3GPP interworking function entity when the current signal quality is lower than the preset quality threshold value.
7. The system according to claim 5, further comprising a first access and mobility management function entity corresponding to the base station to which the terminal is currently connected and the first network;
the first session management functional entity is also used for sending a message that the session line is switched to a first access and mobile management functional entity corresponding to the first network;
the first access and mobile management functional entity is used for sending a command of releasing wireless link resources to the base station according to the switched session line message;
and the base station is used for interacting with the terminal according to the command for releasing the wireless link resource so as to release the wireless link resource of the terminal.
8. The system according to claim 5, wherein the session leg switching request includes an entry address of the second session management function entity;
the first session management function entity is specifically configured to interact with the second session management function entity corresponding to the entry address according to the entry address, so as to complete switching of a session context.
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