WO2010075719A1

WO2010075719A1 - Multimedia session transfer method, device and system between access networks

Info

Publication number: WO2010075719A1
Application number: PCT/CN2009/075303
Authority: WO
Inventors: 金辉; 龙水平; 段小嫣
Original assignee: 华为终端有限公司
Priority date: 2008-12-31
Filing date: 2009-12-04
Publication date: 2010-07-08
Also published as: CN101771978A

Abstract

A multimedia session transfer method, device and system between access networks, which relate to mobile communication technique field and relate to transfer technique between access networks especially. The method includes that a request massage of access transfer including at least two dynamic session transfer identifies (STIs) initiated by a user equipment is received (101); an access transfer flow requested by the user equipment is disposed according to the at least two dynamic STIs (102). The present invention also provides corresponding user equipment, server and system, and the problem can be solved that the user equipment (UE) performs transfer existing at least two dynamic STI between networks by using the present invention.

Description

Method, device and system for transferring multimedia session between access networks. The application is submitted to the Chinese Patent Office on December 31, 2008, and the application number is 200810242204. 0. The invention name is "a multimedia session in the access network. The priority of the Chinese Patent Application, the entire disclosure of which is incorporated herein by reference. TECHNICAL FIELD The present invention relates to the field of mobile communication technologies, and in particular, to a technology for transferring multimedia sessions between access networks. BACKGROUND Currently, a mobile communication network is mainly a CS (Circuit-Switched) network, including GSM, CDMA, and the like. Each operator has established a relatively complete and rich service platform based on the CS network. The MSC (Mobile Switching Center) is responsible for call routing and business logic execution.

IMS (IP Multimedia Sub-system, IP Multimedia Subsystem) is a service network based on IP switching. IMS supports UE access through various packet switched access networks (currently mainly IP-capable access network-IP-CAN, such as GPRS). The IMS network is used for the IMS multimedia service, that is, the IMS is a service platform based on the IP-CAN, and basically corresponds to the MSC of the CS network. IP-CAN provides higher bandwidth than CS networks and supports richer services. The core of IMS is CSCF (Call Session Control Function) and various ASs (servers). S-CSCF (Serving-CSCF, Serving CSCF) is responsible for routing call requests to the correct AS when conditions are met. The AS performs business logic.

Since IMS is a development trend, it is conceivable to transfer the functions of the CS network service platform to the IMS network to realize the unification of the service platform to reduce the new service construction cost and operation cost. The unification of the service platform can be called ICS (IMS Centralised Service).

SC (Service Continuity) studies the session continuity when users move between different access networks, that is, when the user moves, the access network can be changed without interrupting the session.

The specific steps for the SC user equipment (UE) to perform the access network transfer include: the UE initiates a transfer request to the SCC (Service Centralization & Continuity) AS in the new access network, and the UE requests the SCC AS through the transfer request. A new Access Leg (access branch) is established in the new access network; after receiving the transfer request, the SCC AS will access the Remote Leg of the Access Leg of the original access network and the Access Leg of the new access network. Linking and updating the Remote Leg, and releasing the access network of the original access network, the so-called Remote Leg is the call control path between the SCC AS and the peer UE. Access Leg and Remote Leg There is a detailed definition in 3GPP TS 23.237.

An STI (Session Transfer Identifier) is an identifier used to indicate the initiation of a session transfer. Generally, when a new Access Leg is established between the UE and the SCC AS, the SCC AS dynamically allocates each dynamic STI to a specific one. Access Leg one-to-one correspondence. When the user wants to switch, if there is a dynamic STI in the UE, the dynamic STI is included in the transfer request, and the SCC AS can determine, according to the STI, which of the original Access Lego needs to be replaced by the newly established Access Leg.

In the process of implementing the present invention, the inventors have found that at least the following problems exist in the prior art:

How to implement inter-network handover when there are at least two dynamic STIs in the UE for access network handover. Summary of the invention

In view of this, the embodiments of the present invention provide a method for transferring a multimedia session between access networks, a user equipment, a server, and a system to solve the problem of how to implement inter-network handover when there are at least two dynamic STIs when the UE performs handover between access networks. problem.

To solve the above technical problem, in an aspect, a method for transferring a multimedia session between access networks, includes: receiving an access transfer request message that is initiated by a user equipment and includes at least two dynamic session transfer identifiers STI; Two dynamic STIs process the access transfer procedure requested by the user equipment.

Another aspect provides a method for transferring a multimedia session between access networks, including:

Sending an access transfer request message including at least two dynamic STIs;

Receiving a response message of the access transfer request message and processing the flow of the access transfer. Another aspect provides a server for transferring multimedia sessions between access networks, including:

The receiving module is configured to receive an access transfer request message that is initiated by the user equipment and includes at least two dynamic session transfer identifiers (STIs);

a parsing module: parsing the access transfer request message received by the receiving module to extract the at least two dynamic STIs;

a transfer module: an access transfer process for processing the user device request according to the at least two dynamic STIs extracted by the parsing module.

Another aspect provides a system for transferring multimedia sessions between access networks.

The server is configured to receive an access transfer request message that is initiated by the user equipment and includes at least two dynamic session transfer identifiers (STIs), and process the access transfer process that is requested by the user equipment according to the at least two dynamic STIs. Another aspect provides a user equipment for access transfer, including:

a sending module: configured to send an access transfer request message that includes at least two dynamic STIs;

And a processing module: receiving a response message of the access transfer request message sent by the sending module, and processing the process of the access transfer.

The user equipment is configured to send an access transfer request message including at least two dynamic STIs, receive a response message of the access transfer request message, and process the access transfer process.

The method, the user equipment, the server, and the system for transferring a multimedia session between access networks provided by the embodiments of the present invention solve the problem of how to implement inter-network handover when the UE performs at least two dynamic STIs when accessing the network. BRIEF DESCRIPTION OF THE DRAWINGS In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below, and obviously, in the following description The drawings are only some of the embodiments of the present invention, and other drawings may be obtained from those skilled in the art without departing from the drawings.

1 is a schematic diagram of a method according to Embodiment 1 of the present invention;

2 is a schematic diagram of a method according to Embodiment 2 of the present invention;

3 is a flowchart of a method according to Embodiment 3 of the present invention;

4 is a flowchart of a method according to Embodiment 4 of the present invention;

5 is a schematic diagram of a server according to Embodiment 5 of the present invention;

6 is a schematic diagram of a server in a system according to Embodiment 6 of the present invention;

7 is a schematic diagram of a user equipment according to Embodiment 7 of the present invention;

FIG. 8 is a schematic diagram of user equipment in a system according to Embodiment 8 of the present invention. DETAILED DESCRIPTION OF THE INVENTION In order to make the objects, technical solutions and advantages of the present invention more comprehensible, the present invention will be described in detail below with reference to the accompanying drawings.

The first embodiment of the present invention provides a method for transferring a multimedia session between access networks, including the following steps:

As shown in FIG. 1, step 101, the receiving user equipment initiates at least two dynamic session transfer identifiers STI Access transfer request message;

The access transfer request includes: a voice connection of the CS network is transferred to the PS network, or a data connection transfer request between the PS networks, or a voice connection transfer between the PS networks.

The access transfer request including the at least two dynamic transfer identifiers STI indicates that the user equipment UE has a voice connection that needs to be transferred, and there is still more than one data connection needs to be transferred; it may also indicate that the UE has two voice connections that need to be transferred; It can also mean that the UE has two voice connections that need to be transferred, and there is also a data connection that needs to be transferred; it can also indicate that the UE has multiple data connections that need to be transferred.

The receiving, by the user equipment, the access transfer request message that includes the at least two dynamic session transfer identifiers (STIs) includes: parsing the access transfer request message to extract the at least two dynamic STIs;

The parsing the access transfer request message to extract the at least two dynamic STIs is: parsing a message header of the access transfer request message, and extracting a dynamic STI included in the message header;

The header includes but is not limited to at least one of the following:

Replace header, Request-URI header or Target-Dialog header;

When the user equipment includes at least two dynamic STIs, the at least two dynamic STIs may be included in the same message header of the access transfer request message or in different message headers;

If the user equipment includes at least two dynamic STIs in the same message header of the access transfer request message, each dynamic STI is connected by a special connector, for example, the user equipment has three dynamic STIs when the network is transferred. For STI 1, STI2, and STI3, a special connector connection may be used in the same message header, for example, the Request-URI message header of the access transfer request message includes STI 1@STI2@STI3, where the STI 1@STI2@STI3 can also take the form of STI 1; STI2; STI3, or take the form of STI 1 1 | STI2 | | STI3;

If the user equipment includes at least two dynamic STIs in different message headers of the access transfer request message, for example, the user equipment has three dynamic STIs, namely, STI 1, STI2, and STI3, respectively.

STI1 can be included in the Replace message header, STI2 is included in the Request-URI message header, and STI3 is included in the Target-Dialog message header.

Or include STI 1 in the Request-URI header, STI2 is included in the first Replace header, and STI3 is included in the second Replace header.

STI 1 can also be included in the Request-URI header, STI2 is included in the Target-Dialog header, and STI3 is included in the Target-Dialog header.

STI 1, STI2, and STI3 may also be included in the three replacements of the access transfer request message, respectively. In the message header, either STI 1, STI2, and STI3 are respectively included in three Request-URI message headers of the access transfer request message, or STI 1, STI2, and STI3 are respectively included in the access transfer request message. In the three Target-Dialog headers;

And parsing the message header of the access transfer request message, and extracting the dynamic STI included in the message header to adopt the corresponding parsing manner to extract the at least two dynamic STIs according to the manner in which the user equipment includes at least two dynamic STIs;

If the user equipment includes at least two dynamic STIs in the same message header of the access transfer request message, each dynamic STI is connected by a special connector. For example, when the user equipment network is transferred, three dynamic STIs are respectively STI 1, STI2, and STI3 may be connected by using a special connector in the same message header, for example, the Replace or Target-Dialog message header of the access transfer request message includes STI 1@STI2@STI3;

At this time, the SCC AS (Service Centralization & Continuity Application Server) determines whether the STI 1@STI2@STI3 is included according to the content of the Replace or Target-Dialog message header of the access transfer request message. If the determination is yes, STI 1, STI2 and STI3 are extracted for processing in the next step 102;

If the user equipment includes at least two dynamic STIs in different message headers of the access transfer request message, for example, the user equipment has two dynamic STIs, namely, STI 1 and STI2, respectively, when the network is transferred, and the STI 1 is included in The replacement message header, STI2 is included in the Request-URI message header; at this time, the SCC AS determines whether the access transfer request message includes a Replace message header, and if the determination is yes, extracts the STI 1 in the Replace message header; The content of the Request-URI message header of the access transfer request message determines whether the STI2 is included, and if the determination is yes, the STI2 is extracted.

For example, if the user equipment moves in the network, there are three dynamic STIs, namely STI 1, STI2, and STI3, and STI 1 is included in the first Replace message header, STI2 is included in the second Replace message header, and STI3 is included in the third. Replace message headers;

At this time, the SCC AS determines whether the access transfer request message includes a Replace message header, and if yes, extracts the dynamic STI of each Replace message header: STI K STI2, STI3.

If one of the at least two dynamic STIs is allocated by using a CS service control signaling channel, the allocation manner of the dynamic STI allocated by the CS service control signaling channel includes:

Assigned by the user equipment that initiated the multimedia session request; or

Assigned by the corresponding server receiving the multimedia session request; or

The user equipment that initiated the multimedia session request and the corresponding server that receives the multimedia session request are jointly allocated. The dynamic STI allocated by the CS service control signaling channel may be included in a Request-URI message header;

The dynamic STI allocated through the PS is included in the Request-URI header or the Target-Dialog header. If the user equipment that initiates the multimedia session request is allocated, there are two cases: one case is when the user equipment UE initiates the session request, and is sent to the SCC AS through the II interface; the other case is when the UE receives the session When requested, the response message is sent to the SCC AS through the II interface;

If the SCC AS receives the session request from the UE, the SCC AS sends the response message to the UE through the response message in the II interface; when receiving the session request initiated by the other UE to the UE, Allocating an STI to the UE and sending the STI to the UE through an II interface;

If the user equipment that initiates the multimedia session request and the corresponding server that receives the multimedia session request are jointly allocated, the UE part and the SCC AS part are included. When the UE initiates a session request, the UE part is carried, and the SCC AS allocates the SCC AS part after receiving the request of the UE, and sends the SCC AS part to the UE through the II interface; when the SCC AS receives other UEs and initiates the message to the UE. When the session is requested, the SCC AS part is allocated to the UE, and is sent to the IE through the II interface. After receiving the UE, the UE allocates the UE part, and sends the dynamic STI to the SCC AS through the II interface. For example: STI can be in the form of ueal. xfer@sccas. homel. xfer, ueal in front of @ symbol. xfer is the UE part, sccas. @l. is the SCC AS part; or STI can be "Cal" l ID; UE Tag; SCC AS Tag", where the Cal l ID can be a random number or a string, which is allocated by the initiating session requester, that is, when the UE initiates a session request, it is allocated by the UE, when other UEs are When the UE initiates the request, it is allocated by the SCC AS, and the Cal ID is used to identify the session. The UE Tag is a label assigned to the UE to identify the UE. SCC AS Tag is a label assigned to the SCC AS to identify the SCC AS. Similarly, the UE Tag and SCC AS Tag can be a random number or a string. When the call is initiated by the UE, the UE allocates a Cal ID and a UE Tag, and the two parts cooperate to form a UE part, the SCC AS allocates an SCC AS Tag, and the SCC AS Tag is an SCC AS part; when the call is initiated by another UE, The SCC AS allocates the Cal ID and the SCC AS Tag. The two parts cooperate to form the SCC AS part. The UE allocates the UE Tag and the UE Tag is the UE part.

Step 102: Process an access transfer procedure requested by the user equipment according to the at least two dynamic STIs. The main advantage of the solution proposed in this embodiment is to solve the problem of how to implement inter-network handover when the UE performs at least two dynamic STIs in the inter-network transfer.

The second embodiment provided by the present invention is another method for transferring a multimedia session between access networks, and the method includes the following steps:

Step 201: Send an access transfer request message that includes at least two dynamic STIs. The access transfer request includes: a voice connection of the CS network is transferred to the PS network, or a data connection transfer request between the PS networks, or a voice connection transfer between the PS networks.

The access transfer request including the at least two dynamic transfer identifiers STI indicates that the user equipment UE has a voice connection that needs to be transferred, and there is also one data connection that needs to be transferred; it may also indicate that the UE has two voice connections that need to be transferred; It may indicate that the UE has two voice connections that need to be transferred, and there is also a data connection that needs to be transferred; it may also indicate that the UE has multiple data connections that need to be transferred.

The header includes but is not limited to at least one of the following:

Replace header, Request-URI header or Target-Dialog header;

If the user equipment includes at least two dynamic STIs in the same message header of the access transfer request message, each dynamic STI is connected by a special connector, for example, the user equipment has three dynamic STIs when the network is transferred. For STI 1, STI2, and STI3, a special connector connection may be used in the same message header, for example, the Request-URI message header of the access transfer request message includes STI 1@STI2@STI3, where the STI 1 @STI2@STI3 can also take the form of STI 1 ; STI2; STI3, or take the form of STI 1 1 | STI2 | | STI3;

STI1 can be included in the Iteplace header, STI2 is included in the Request-URI header, and STI3 is included in the Target-Dialog header.

Or include STI 1 in the Request-URI header, STI2 in the first Iteplace header, and STI3 in the second Iteplace header;

STI 1, STI2, and STI3 may also be included in the three Iteplace headers of the access transfer request message, respectively;

Or STI 1, STI2, and STI3 are respectively included in three Request-URI message headers of the access transfer request message;

Or STI 1, STI2 and STI3 are respectively included in the three Target-Dialog headers of the access transfer request message. In addition, if the access transfer request includes a voice connection of the CS network and is transferred to the PS network, and the voice connection of the CS network is established through the II interface, that is, one of the at least two dynamic STIs is a CS service control signaling channel. The allocation manner of the dynamic STI allocated by the CS service control signaling channel includes:

If the user equipment that initiates the multimedia session request and the corresponding server that receives the multimedia session request are jointly allocated, the UE part and the SCC AS part are included. When the UE initiates a session request, the UE part is carried, and the SCC AS allocates the SCC AS part after receiving the request of the UE, and sends the SCC AS part to the UE through the II interface; when the SCC AS receives other UEs and initiates the message to the UE. When the session is requested, the SCC AS part is allocated to the UE, and is sent to the IE through the II interface. After receiving the UE, the UE allocates the UE part, and sends the dynamic STI to the SCC AS through the 11 interface. For example: STI can be in the form of ueal. xfer@sccas. homel. xfer, ueal in front of @ symbol. xfer is the UE part, sccas. @l. is the SCC AS part; or STI can be "Cal" l ID; UE Tag; SCC AS Tag", where the Cal l ID can be a random number or a string, which is allocated by the initiating session requester, that is, when the UE initiates a session request, it is allocated by the UE, when other UEs are When the UE initiates the request, it is allocated by the SCC AS, and the Cal ID is used to identify the session. A tag assigned by the UE to the UE to identify the UE. SCC AS Tag A label assigned to the SCC AS to identify the SCC AS. Similarly, the UE Tag and SCC AS Tag can be a random number or a string. When the call is initiated by the UE, the UE allocates a Cal ID and a UE Tag, and the two parts cooperate to form a UE part, the SCC AS allocates an SCC AS Tag, and the SCC AS Tag is an SCC AS part; when the call is initiated by another UE, The SCC AS allocates the Cal ID and the SCC AS Tag. The two parts cooperate to form the SCC AS part. The UE allocates the UE Tag and the UE Tag is the UE part. Step 202: Receive a response message of the access transfer request message and process the flow of the access transfer. The main advantage of the solution proposed in this embodiment is to solve the problem of how to implement inter-network handover when the UE performs at least two dynamic STIs when accessing the network.

The third embodiment of the present invention provides a method for transferring a multimedia session between access networks. As shown in FIG. 3, first, UE-A is a UE with ICS (IMS Centralised Service) capability. The ICS UE is a UE with a service control signaling channel, and the service control signaling channel is a signaling path between the UE and the SCC AS. The service control signaling channel established through the CS network is a CS service control signaling channel, and the PS network is used. The established service control signaling channel is a PS service control signaling channel. In the ICS topic, the I I interface can be used instead of the CS service control signaling channel, and the Gm interface can be used instead of the PS service control signaling channel.

MSC Server: The entity introduced by the CS mobile network softswitch, including the call control and mobility management functions of the MSC, controls the CS-MGW (CS Media Gateway) to carry the media stream of the call;

The MSC Server and the UE communicate through the mobile network layer 3 signaling (eg, 24.008 signaling in the 3GPP network). At the same time, the MSC Server can implement IMS network SIP signaling and mobile network layer 3 signaling conversion;

CS-MGW: CS media gateway, used for CS network and IMS network media stream interworking;

S-CSCF: Serving-CSCF, Serving CSCF, where CSCF (Call Session Control Function): Performs the registration/registrar function and performs session control services;

SCC AS (SCC Application Server): where SCC is Service Centralization & Continuity, service concentration and session continuity, and SCC AS completes the transfer function between access branches of different access networks;

A scenario is assumed here: ICS UE-A using I I interface and UE-B have a data connection in PS1, and a voice connection exists in the CS network. The dynamic STI corresponding to the access leg in the PS1 is STI_1, and the dynamic STI corresponding to the access leg in the CS network is STI_2. When the UE-A moves to a PS2 coverage area, the PS2 has a higher data transmission rate and voice transmission quality, and the UE-A actively initiates a process of transferring from the CS network to the PS2 and the PS1 to the PS2.

As shown in Figure 3, the method of access transfer is as follows:

Step 301, the ICS UE-A initiates an access transfer request message to the SCC AS in the PS2, the access transfer request message includes dynamic STI-1 and STI-2, and the access transfer request message arrives at the SCC AS via the S-CSCF;

Here two dynamic STIs can be carried in two ways:

Method 1: Included in different SIP message headers;

The dynamic STI (STI-1) in PS1 is included in the Replace message header, and the dynamics obtained through the II interface STI (STI-2) is included in the Request-URI header or Target-Dialog header; STI-1 can also be included in the Target-Dialog header, STI-2 is included in the Replace header; SIP messages can also be used. Contains two Replace headers, each Replace header contains a dynamic STI; or SIP message contains two Target-Dialog headers, each Target-Dialog header contains a dynamic STI;

Method 2: Include the same SIP message header;

The two dynamic STIs are included in the Replace message header or the Target-Dialog message header. The two dynamic STIs are connected by a special connector, such as STI 1@STI2, STI 1 ; STI2 or STI ll | STI2; The dynamic STI (STI-2) transmitted by the II interface has the following three allocation methods:

Method 1: Assigned by UE-A:

In one case, when the user equipment UE initiates a session request, it is sent to the SCC AS through the I I interface; in another case, when the UE receives the session request, it sends a response message to the SCC AS through the I I interface;

Method 2, assigned by SCC AS:

When the SCC AS receives the session request from the UE, it sends the message to the UE through the response message in the II interface. When receiving the session request initiated by the other UE to the UE, the STI is allocated to the UE and sent through the II interface. Give the IE;

Mode 3: Jointly allocated by UE-A and SCC AS:

The UE part and the SCC AS part are included, when the UE initiates a session request, the UE part is carried, and the SCC AS allocates the SCC AS part after receiving the request of the UE, and sends the SCC AS part to the UE through the II interface; When the UE requests the session initiated by the UE, the SCC AS part is allocated to the UE, and is sent to the IE through the II interface. After receiving the UE, the UE allocates the UE part, and sends the dynamic STI through the II interface. Give the SCC AS. For example: STI can be in the form of ueal. xfer@sccas. homel. xfer, ueal in front of @ symbol. xfer is the UE part, sccas. @l. is the SCC AS part; or STI can be "Call"ID; UE Tag; SCC AS Tag", where the Call ID can be a random number or a string, which is allocated by the initiating session requester, that is, when the UE initiates a session request, it is allocated by the UE, when other UEs are to the UE. When the request is initiated, it is assigned by the SCC AS, which is used to identify the session. A tag assigned by the UE to the UE to identify the UE. SCC AS Tag A label assigned to the SCC AS to identify the SCC AS. Similarly, the UE Tag and SCC AS Tag can be a random number or a string. When the call is initiated by the UE, the UE allocates a Call ID and a UE Tag, and the two parts cooperate to form a UE part, the SCC AS allocates an SCC AS Tag, and the SCC AS Tag is an SCC AS part; when the call is initiated by another UE, the SCC The AS assigns the Call ID and the SCC AS Tag, and the two parts work together. For the SCC AS part, the UE allocates a UE Tag, and the UE Tag is a UE part.

Step 302: The SCC AS includes two dynamic STIs according to the request message in step 301. It is learned that the UE-A needs to move the access leg of the CS network to the PS2 and transfer the access leg of the PS1 to the PS2, and the SCC AS updates the UE. The UE-B of the peer end of -A, the purpose of which is to request the UE-B to connect the voice and data with the UE-A to the PS2 of the UE-A; the request message arrives at the S-CSCF Said UE-B;

The method for the SCC AS to learn that the UE's request message includes two dynamic STIs is:

a) For two dynamic STIs that are included in different headers:

The SCC AS determines whether the dynamic STI is included according to the content of the Request-URI message header. If the session including the UE-A request to transfer the CS network is included, the SCC AS determines whether the SIP message includes a Replace or Target-Dialog message header, if the description includes UE-A. Request to transfer the session of the PS1 network;

Or the SCC AS determines whether the request message includes both the Replace and Target-Dialog headers, if it is a session in which the UE-A requests to transfer the CS and the PS1 network;

Or the SCC AS determines whether the request message includes two Replace or two Target-Dialog headers, if it is a description of the UE-A request to transfer the CS and PS1 sessions;

b) For the case where two dynamic STIs are contained in the same header:

The SCC AS determines whether the two dynamic STIs are included in the Replace or Target-Dialog header. If the UE-A requests to transfer the session between the CS and the PS1 network, the STI can be used to distinguish different STIs according to the special connector. Step 303: UE-B returns a 200 OK acknowledgement message, and the acknowledgement message arrives at the SCC AS via the S-CSCF;

Step 304, the SCC AS sends a 200 OK message to the UE-A, confirming that the transfer is successful, and the message arrives at the UE-A via the S-CSCF;

Step 305: The SCC AS sends a bye message to the access leg of the CS network of the UE-A, where the message is used to disconnect the voice connection between the UE-A and the UE-B, and the message is The S-CSCF arrives at the MSC Server corresponding to the UE-A;

Step 306: After receiving the Bye message, the MSC Server corresponding to the UE-A sends a Disconnect message to the UE-A.

Step 307: The UE-A returns a Release message to the MSC Server.

Step 308: After receiving the Release message, the MSC Server sends a 200 OK confirmation message to the SCC AS, confirming that the voice disconnection is successful, and the confirmation message arrives at the SCC AS via the S-CSCF.

Step 309: The SCC AS sends a bye message to the access leg of the PS1 network of the UE-A, where the The role of the information is to disconnect the UE-A from the UE-B data connection, the message arrives at the UE-A via the S-CSCF;

Step 3010, the UE-A returns a 200 OK confirmation message to the SCC AS, confirming that the data connection is disconnected successfully, and the confirmation message arrives at the SCC AS via the S-CSCF;

The main advantage of the solution proposed in this embodiment is that it provides a method flow of network transfer in a scenario, and describes in detail a solution when the user equipment has multiple dynamic STIs when performing network transfer.

The fourth embodiment of the present invention is a flow of another method for transferring a multimedia session between access networks, as shown in FIG. 4, and the functional entity is the same as that in the third embodiment, and details are not described herein again.

A scenario is assumed here: UE-A and UE-B have a voice connection in PS1, and a data connection exists in PS2; the dynamic STI corresponding to the access leg in PS1 is STI_1, and the access leg in PS2 corresponds. The dynamic STI is STI-2. When the UE-A moves to an area covered by a PS3 network, the PS3 has a higher data transmission rate and voice transmission quality than PS1 and PS2, and the UE-A actively initiates a PS1 to PS3 network and a PS2. The process of transferring to the PS3 network.

As shown in Figure 4, the specific steps are as follows:

Step 401: UE-A initiates an access transfer request message to the SCC AS in the PS3 network, where the access transfer request message includes dynamic STI-1 and STI-2, and the access transfer request message arrives at the SCC AS via the S-CSCF;

Here two dynamic STIs can be carried in two ways:

Method 1: Included in different SIP message headers;

The dynamic STI (STI-1) in the PS1 network is included in the Replace header, and the dynamic STI (STI-2) in the PS2 network is included in the Request-URI header or the Target-Dialog header.

STI-1 can also be included in the Target-Dialog header, STI-2 is included in the Replace header; SIP messages can contain two Replace headers, each header contains a dynamic STI; or SIP messages contain two Target-Dialog headers, each header contains a dynamic STI;

Method 2: Include the same SIP message header;

The two dynamic STIs are included in the Replace message header or the Target-Dialog message header. The two dynamic STIs are connected by a special connector, such as STI 1@STI2, STI 1 ; STI2 or STI ll | STI2; 402. The SCC AS includes two dynamic STIs according to the request message in step 401. It is learned that the UE-A needs to move the access leg of the PS1 to the PS3 and the access leg of the PS2 to the PS3, and the Ij SCC AS updates the UE- The UE-B of the opposite end of A, the purpose of which is to request the UE-B to connect the voice and data with the UE-A to the PS3 of the UE-A; the request message arrives at the S-CSCF to reach the UE-B; The method for the SCC AS to learn that the UE's request message includes two dynamic STIs is as follows: Case 1: For two dynamic STIs included in different message headers,

The SCC AS determines whether the dynamic STI is included according to the content of the Request-URI message header. If the session including the UE-A request to transfer the PS1 network is included, the SCC AS determines whether the SIP message includes a Replace or Target-Dialog message header, if the description includes UE-A. Request to transfer the session of the PS2 network;

Or the SCC AS determines whether the request message includes both the Replace and Target-Dialog headers, if it is a description of the UE-A request to transfer the session between the PS1 and the PS2 network;

Or the SCC AS determines whether the request message includes two Replace or two Target-Dialog headers, if it is a description of the UE-A request to transfer the session between the PS1 and the PS2 network;

Case 2: For two dynamic STIs containing the same message header,

The SCC AS determines whether the two dynamic STIs are included in the Replace or Target-Dialog message header. If the UE-A requests to transfer the session between the PS1 and the PS2 network, the STI can be used to distinguish different STIs according to the special connector. Step 403: UE-B returns a 200 OK acknowledgement message, and the acknowledgement message arrives at the SCC AS via the S-CSCF;

Step 404: The SCC AS sends a 200 OK message to the UE-A, confirming that the transfer is successful, and the message arrives at the UE-A via the S-CSCF.

Step 405: The SCC AS sends a bye message to the access leg of the PS1 network of the UE-A, where the message is used to disconnect the voice connection between the UE-A and the UE-B. S-CSCF arrives at the UE-A;

Step 406: The UE-A returns a 200 OK confirmation message to the SCC AS, confirming that the voice connection is successfully disconnected, and the acknowledgement message arrives at the UE-A via the S-CSCF;

Step 407: The SCC AS sends a bye message to the access leg of the PS2 network of the UE-A, where the message is to disconnect the data connection between the UE-A and the UE-B, and the message arrives through the S-CSCF. The UE-A;

Step 408, the UE-A returns a 200 OK confirmation message to the SCC AS, confirming that the data connection is disconnected successfully, and the confirmation message arrives at the UE-A via the S-CSCF;

The main advantage of the solution proposed in this embodiment is that it provides a method for network transfer in another scenario, and describes in detail a solution when the user equipment has multiple dynamic STIs when performing network transfer.

The fifth embodiment provided by the present invention is a server for transferring multimedia sessions between access networks, and includes the following modules:

As shown in FIG. 5, the server 51 includes but is not limited to a computer and a smart device, wherein the smart device has a letter No. of processing equipment, including but not limited to mobile Internet devices, fixed Internet devices and mobile network devices suitable for 2G, 2. 5G, future 3G, 3G, and IP Multimedia Sub-domain (IMS), server 51 for implementation The function of the CRS AS, and has the function of implementing multiple dynamic STIs;

The receiving module 501 is configured to receive an access transfer request message that is initiated by the user equipment and includes at least two dynamic session transfer identifiers (STIs);

The parsing module 502 is configured to parse the access transfer request message received by the receiving module 501 to extract the at least two dynamic STIs;

The transfer module 503 is configured to process the access transfer process requested by the user equipment according to the at least two dynamic STIs extracted by the parsing module 502.

The main advantage of the solution proposed in this embodiment is that a server that provides access transfer is solved.

The UE performs the problem of how to transfer between networks when there are at least two dynamic STIs in the access network.

The sixth embodiment of the present invention provides a system for transferring a multimedia session between access networks, including: a user equipment, a server, and the like, where the user equipment includes, but is not limited to, an electronic device having a wireless communication capability, such as a mobile phone or a PDA. The server includes but is not limited to a computer and a smart device, wherein the smart device is a signal processing device, including but not limited to a mobile internet device, a fixed internet device, and is suitable for 2G, 2. 5G, future 3G, and 3G. And IP Multimedia Sub-domain (IMS) mobile network devices.

A system for transferring multimedia sessions between access networks, including a server,

The server receives an access transfer request message that is initiated by the user equipment and includes at least two dynamic session transfer identifiers (STIs), and parses the access transfer request message to extract the at least two dynamic STIs, and processes according to the at least two dynamic STIs. The access transfer procedure requested by the user equipment.

As shown in FIG. 6, the server 61 is configured to implement the functions of the CRS AS and has a function of implementing parsing of multiple dynamic STIs; and the server 61 includes the following modules:

The receiving module 601 is configured to receive an access transfer request message that is initiated by the user equipment and includes at least two dynamic session transfer identifiers (STIs);

The parsing module 602 is configured to parse the access transfer request message received by the receiving module 601 to extract the at least two dynamic STIs;

The transfer module 603 is configured to process the access transfer process requested by the user equipment according to the at least two dynamic STIs extracted by the parsing module 602.

The main advantage of the solution proposed in this embodiment is that the system for transferring multimedia sessions between access networks solves the problem of implementing the UE to perform inter-network handover with at least two dynamic STIs. The seventh embodiment of the present invention provides a user equipment for transferring a multimedia session between access networks, and includes the following modules:

As shown in FIG. 7, the user equipment 71 includes, but is not limited to, an electronic device having a wireless communication capability, such as a mobile phone or a PDA; and includes the following modules:

The sending module 701 is configured to send an access transfer request message that includes at least two dynamic STIs.

The processing module 702 is configured to receive a response message of the access transfer request message sent by the sending module 701, and process the access transition.

A dynamic STI module 7001 is included: it is located inside the transmitting module 701 and is configured to include at least two dynamic STIs in different message headers of the access transfer request message or in the same message header.

The main advantage of the solution proposed in this embodiment is that a functional module design manner of a user equipment for transferring multimedia sessions between access networks is provided, which has the function of realizing the inter-network handover in which at least two dynamic STIs exist.

An eighth embodiment of the present invention provides a system for transferring a multimedia session between access networks, including: a user equipment, a server, and the like, where the user equipment includes, but is not limited to, an electronic device having a wireless communication capability, such as a mobile phone or a PDA. The server includes but is not limited to a computer and a smart device, wherein the smart device is a signal processing device, including but not limited to a mobile internet device, a fixed internet device, and is suitable for 2G, 2. 5G, future 3G, and 3G. And IP Multimedia Sub-domain (IMS) mobile network devices.

The user equipment sends an access transfer request message including at least two dynamic STIs, receives a response message of the access transfer request message, and processes the flow of the access transfer.

As shown in FIG. 8, the user equipment 81 includes the following modules:

The sending module 801 is configured to send an access transfer request message that includes at least two dynamic STIs.

The processing module 802 is configured to: receive a response message of the access transfer request message sent by the sending module 801, and process the access transition process;

A dynamic STI module 8001 is included: it is located inside the transmitting module 801 for including at least two dynamic STIs in different message headers of the access transfer request message or in the same message header.

The main advantage of the solution proposed in this embodiment is that a system for transferring multimedia sessions between access networks is provided, which has the function of realizing the inter-network transfer with at least two dynamic STIs.

It will be understood by those skilled in the art that the drawings are only a schematic representation of a preferred embodiment, and that the modules, entities or processes in the drawings are not necessarily required to practice the invention. Those skilled in the art can understand that the user equipment, the server, and the modules or entities in the system may be distributed in the user equipment, the server, and the system in the embodiments according to the description of the embodiments, and the corresponding changes may be different. In one or more devices of this embodiment. The modules or entities of the above embodiments may be combined into one module or entity, or may be further split into multiple sub-modules or entities.

The serial numbers of the embodiments of the present invention are merely for the description, and do not represent the advantages and disadvantages of the embodiments.

Through the description of the above embodiments, those skilled in the art can clearly understand that the present invention can be implemented by hardware, or can be implemented by means of software plus a necessary general hardware platform. Based on such understanding, the technology of the present invention. The solution can be embodied in the form of a software product that can be stored in a non-volatile storage medium (which can be a CD-ROM, a USB flash drive, a mobile hard disk, etc.), including a number of instructions for making a computer device ( The method described in various embodiments of the present invention may be a personal computer, a server, or a network device. The above is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of changes or within the technical scope disclosed by the present invention. Alternatives are intended to be covered by the scope of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

Rights request

A method for transferring a multimedia session between access networks, characterized in that it comprises:

Receiving, by the user equipment, an access transfer request message that includes at least two dynamic session transfer identifiers STI, where the at least two dynamic STIs are included in the same message header of the access transfer request message or in different message headers; The at least two dynamic STIs process an access transfer procedure requested by the user equipment.

The method of claim 1, wherein the receiving the user equipment initiated the access transfer request message including the at least two dynamic session transfer identifiers STI comprises:

Parsing the access transfer request message to extract the at least two dynamic STIs.

3. The method according to claim 1, wherein the message header comprises at least one of the following: a Replace message header, a Request-URI message header, or a Target-Dialog message header.

4. The method according to claim 1, wherein when the at least two dynamic STIs are included in different message headers of the access transfer request message, the transfer request message includes at least two Replace messages. Header, each Replace message header contains a dynamic STI; or

The transfer request message includes at least two Target-Dialog headers, and each Target-Dialog header contains a dynamic STI.

The method according to claim 1, wherein one of the at least two dynamic STIs is allocated by using a CS service control signaling channel, and the allocation manner includes:

The user equipment that initiated the multimedia session request and the corresponding server that receives the multimedia session request are jointly allocated.

6. The method according to claim 5, wherein when the dynamic STI allocated through the CS service control signaling channel is jointly initiated by the user equipment that initiates the multimedia session request and the corresponding server that receives the multimedia session request When allocated, the dynamic STI includes a user part and a server part.

The method according to claim 3, wherein one of the at least two dynamic STIs is allocated by using a CS service control signaling channel, and the dynamic STI is included in a Request-URI message header.

8. A method for transferring a multimedia session between access networks, the method comprising:

Transmitting an access transfer request message including at least two dynamic STIs, where the at least two dynamic STIs are included in the same message header of the access transfer request message or in different message headers;

Receiving a response message of the access transfer request message and processing the flow of the access transfer.

9. The method of claim 8, wherein the message header comprises at least one of the following: Replace header, Request-URI header, or Target-Dialog header.

10. The method of claim 8 wherein:

If the at least two dynamic STIs are included in the same message header of the access transfer request message, each dynamic STI is connected by a special connector;

If the at least two dynamic STIs are included in different headers of the access transfer request message, each message header includes a dynamic STI.

The method according to claim 8, wherein when the at least two dynamic STIs are included in different message headers of the access transfer request message, the transfer request message includes at least two Replace messages. Header, each Replace message header contains a dynamic STI; or

The method according to claim 8, wherein one of the at least two dynamic STIs is allocated by using a CS service control signaling channel, and the allocation manner includes:

The method according to claim 12, wherein when the dynamic STI allocated by the CS service control signaling channel is jointly initiated by the user equipment that initiates the multimedia session request and the corresponding server that receives the multimedia session request When allocated, the dynamic STI includes a user part and a server part.

The method according to claim 9, wherein one of the at least two dynamic STIs is allocated through a CS service control signaling channel, and the dynamic STI allocated by the CS service control signaling channel is included in Request-URI header.

A server for transferring a multimedia session between access networks, the server includes: a receiving module, configured to receive an access transfer request message that is initiated by a user equipment and includes at least two dynamic session transfer identifiers (STIs), The at least two dynamic STIs are included in the same message header of the access transfer request message or in different message headers;

The transfer module is configured to process the access transfer process of the user equipment request according to the at least two dynamic STIs extracted by the parsing module.

A user equipment for transferring a multimedia session between access networks, the user equipment comprising: a sending module: configured to send an access transfer request message including at least two dynamic STIs;

The user equipment according to claim 16, wherein the sending module comprises: a dynamic STI module, configured to include at least two dynamic STIs in different message headers of the access request message or the same In a message header.

A system for transferring a multimedia session between access networks, comprising a server and a user equipment, wherein: the user equipment is configured to send an access transfer request message including at least two dynamic STIs, and receive the access. Transmitting a response message of the request message and processing the flow of the access transfer, the at least two dynamic STIs being included in the same message header of the access transfer request message or in different message headers;

The server is configured to receive an access transfer request message that is sent by the user equipment and includes at least two dynamic session transfer identifiers (STIs), and the server processes the access transfer process that is requested by the user equipment according to the at least two dynamic STIs.