CN101848512B - Method and device for transferring session related information - Google Patents

Abstract

The embodiment of the invention discloses a transfer method and device for session-related information. A method for transferring session-related information includes: before and after the transfer of session-related information is completed, whether there is an increase or decrease in the circuit-switched CS media stream on the main user equipment controller UE; if yes, updating the Collaborative Session Control, and transfer the session-related information; wherein, the session-related information includes: joint session control rights or media streams; applying the above technical solutions, UEs with both PS and CS capabilities can also implement complete media stream transfers, And it can become a controller UE to implement operations such as transfer, deletion, addition, and service supplementation of media streams in a joint session, so that user experience is significantly improved.

Description

Method and device for transferring session-related information

technical field

The invention relates to the technical field of communication, in particular to a method and device for transferring session-related information.

Background technique

IMS (IP Multimedia Subsystem, IP Multimedia Subsystem) is a service network based on IP (Internet protocol, Internet Protocol) exchange, supports voice, video, data and other media services, and can realize the integration of various types of networks. The core technology of the next generation communication network.

In the IMS network, the local user can transmit different media streams on different local UEs (User Equipment, User Equipment), such as transmitting voice media streams on fixed phones and transmitting data media streams on computers. In this way, there are multiple sessions (sessions) between the local end and the SCC AS (Service Centralization & Continuity Application Server) on the network side, and these sessions are integrated by the SCC AS into a Collaborative Session (joint session ) and then presented to the peer user. Among the UEs at the local end, there is generally one UE that has control over the entire Collaborative Session, and can perform operations such as transferring, deleting, adding, and supplementing services on any media stream in the Collaborative Session. This type of UE is called a controller UE (master control UE) User equipment); and other UEs that only have media streams are called controlee UEs (controlled user equipment), and the controllee UEs can only delete their own media streams and perform renegotiation operations on encoding methods.

During the session, for the local user, part or all of the media streams of the session can be transferred between different local UEs without interrupting the current session according to actual needs or changes in the access network. Or transfer the control right of the Collaborative Session between different UEs. In the process of realizing the present invention, the inventor found that there are at least the following problems in the prior art: in the prior art, the transfer of the media stream or the control right is for the PS (packet switching) network, and it cannot be realized for the CS media. flow transfer. In practical applications, many UEs have PS and CS capabilities at the same time. At present, such UEs cannot implement complete media stream transfer functions, nor can they transfer session control rights to become controller UEs, resulting in poor user experience. .

Contents of the invention

In view of this, the embodiments of the present invention provide a method and device for transferring session-related information, so as to realize the transfer of CS media stream and joint session control rights, and the technical solution is as follows:

An embodiment of the present invention provides a method for transferring session-related information, including:

Judging whether there is an increase or decrease of circuit switched CS media streams on the master user equipment controller UE before and after the transfer of session-related information is completed;

If so, update the Collaborative Session Control of the joint session control right, and transfer the session-related information;

Wherein, the session-related information includes: joint session control rights or media streams;

The master user equipment is: a user equipment having the joint session control right, and the master user equipment changes with the transfer of the joint session control right.

An embodiment of the present invention also provides a session-related information transfer device, including:

The judging unit is used to judge whether there is an increase or decrease of the circuit-switched CS media stream on the master user equipment controllerUE before and after the transfer of the session-related information is completed;

A control right updating unit, configured to update the Collaborative Session Control when the judging result of the judging unit is yes;

a transfer unit, configured to transfer the session-related information after the control right updating unit updates the session control right;

Wherein, the session-related information includes: joint session control rights or media streams;

The master user equipment is: a user equipment having the joint session control right, and the master user equipment changes with the transfer of the joint session control right.

The above technical solution, on the basis of the existing technology, further realizes the transfer of CS media stream and joint session control right. Applying the above technical solution, a UE with PS capability and CS capability can also realize the complete media stream transfer function. And it can become a controller UE to further implement operations such as transfer, deletion, addition, and service supplementation of media streams in joint sessions, so that user experience is significantly improved.

Description of drawings

Fig. 1 is the flow chart that realizes the specific embodiment 1 of the method of the present invention;

Fig. 2 is the flow chart that realizes the second embodiment of the method of the present invention;

Fig. 3 is the flow chart that realizes the third specific embodiment of the method of the present invention;

Fig. 4 is the flow chart that realizes the fourth embodiment of the method of the present invention;

Fig. 5 is the flow chart that realizes the fifth embodiment of the method of the present invention;

Fig. 6 is the flowchart of realizing the sixth embodiment of the method of the present invention;

FIG. 7 is a schematic structural diagram of a session-related information transfer device according to an embodiment of the present invention;

FIG. 8 is another schematic structural diagram of an apparatus for transferring session-related information according to an embodiment of the present invention.

Detailed ways

In the embodiment of the present invention, Collaborative Session Control (joint session control right) is passed through Collaborative Session Control Signaling Path (joint session control right signaling channel), and Collaborative Session Control Signaling is SIP (SessionInitiation Protocol, session initialization protocol) in PS network protocol) signaling, the Controller UE controls the media stream in the Collaborative Session through SIP signaling.

In the embodiment of the present invention, a UE having both PS capability and CS capability is referred to as SC UE for short, that is, a user equipment capable of maintaining session continuity, and SC UE can simultaneously perform PS session and CS session. Among them, the PS session of the SC UE can be directly controlled by the SC UE itself through the SIP signaling in the PS network; the SC UE can only control the service of its CS session through the CS network, and the SC UE can associate the PS session with the CS session , presented to the peer as a session by the server. The service control described here includes operations such as transfer, deletion, addition, and service supplementation of media streams. When the SC UE is the controller UE of the Collaborative Session, the controller UE can control the service of the media in the PS session and the CS session of the SC UE through the server.

In combination with the above characteristics of the SC UE, the embodiment of the present invention provides a method for transferring session-related information, which is characterized in that it includes:

Determine whether there is an increase or decrease of CS media streams on the controller UE before and after the transfer of session-related information is completed;

If yes, update the Collaborative Session Control;

and transfer the session-related information;

Wherein, the session-related information includes: Collaborative Session Control or media stream;

Since the controller UE refers to the user equipment with Collaborative Session Control, the controller UE will change with the transfer of Collaborative Session Control. Specifically, before the transfer of Collaborative Session Control, the transfer source device is the controller UE, and after the transfer is completed, the transfer target device will become the controller UE.

The above technical solution, on the basis of the existing technology, realizes the transfer of CS media stream and joint session control rights between different UEs. Applying the above technical solution, UEs with both PS and CS capabilities can also implement complete media Stream transfer, and can become a controller UE to further implement operations such as transfer, deletion, addition, and service supplementation of media streams in joint sessions, which significantly improves user experience.

The following will introduce the transfer methods of session-related information in different application scenarios respectively through Embodiment 1 to Embodiment 6, wherein the session-related information described in the embodiment of the present invention includes media stream and joint session control right.

Embodiment one:

Assuming that UE-1 and UE-2 are local user equipment, UE-1 and UE-2 have real-time media streams media-B and media-A, media-B and media-A respectively with Remote-UE (peer UE) Constitute the current Collaborative Session. Among them, UE-2 is SC UE, media-A is CS media stream, current UE-1 is controller UE, and UE-2 is controller UE.

This embodiment provides a method for transferring the Collaborative Session Control of UE-1 to UE-2, as shown in Figure 1, including the following steps:

S101. UE-1 initiates a control transfer request to the SCC AS, requesting to transfer the Collaborative SessionControl to UE-2, and the request can reach the SCC AS through S-CSCF (Serving-Call Session Control Function, Serving-Call Session Control Function Entity). The request message can use messages such as refer (reference), re-Invite (re-invite) or Update (update).

In the request message, a specific message header needs to be carried to indicate the transfer operation of the session control right. For example, if the IUT-Transfer (inter-user equipment transfer) message header is used, it is used to indicate the specific message for the transfer of the session control right. The header format can be as follows:

IUT-Transfer: <Session Control Transfer>.

The message body of the request message can be used to carry the status information of each media stream of the current Collaborative Session, and the status information can include the type of media stream (such as voice, video, data, etc.), encoding method, and the identification of the UE where the media stream currently resides (such as GRUU (Globally Routable UserAgent URI, Universal Routable User Agent Uniform Resource Identifier), IP address, etc.), the message body can use SDP (Session Description Protocol, Session Description Protocol) or XML (eXtensibleMarkup Language, Extensible Markup Language ) and other forms.

It should be noted that UE-1 may not provide the CollaborativeSession information to the SCC AS in this step, and in the subsequent steps, the SCC AS will process according to the CollaborativeSession information saved by itself.

S102. The SCC AS determines whether the transfer target UE currently has a CS media stream.

The SCC AS can first judge the type of the transfer target UE. If the transfer target UE is not an SC UE, or the transfer target UE is an SC UE but currently does not have a CS media stream, then the existing procedure can be used to transfer the session control right. In this embodiment and subsequent embodiments, such cases will not be described in detail again.

In this embodiment, the SCC AS determines that the transfer target UE-2 is an SC-UE, and the UE-2 currently has a CS media stream Media-A, and then further executes subsequent procedures.

S103. The SCC AS sends a control right transfer-in request to UE-2, requesting to transfer the Collaborative SessionControl to UE-2, and the request can reach UE-2 through the S-CSCF. The request message may use an Invite (invitation) message, and the message body may use an SDP format.

Since the SC UE cannot perform service control on its own CS media stream, in the request message, it should separate/delete the control right to Media-A in the existing Collaborative Session Control Signaling, that is, the m line corresponding to Media-A (Media line) port is set to 0.

Correspondingly, the request message also includes the status information of each media stream in the current Collaborative session except Media-A. The SCC AS may delete the relevant information of Media-A according to the information provided by UE-1 in S101 (or the information stored by the SCC AS itself), and then write the state information of other media streams into the message body of the request message.

S104. UE-2 returns a confirmation message to the SCC AS.

After receiving the control transfer request sent by the SCC AS, UE-2 sends a 200 OK message to the SCC AS for confirmation.

S105. The SCC AS starts to accept the service control on media-A initiated by the CS network.

After UE-2 becomes the controller UE, it can control the media streams of all PS sessions on the PS network, but needs to control the media streams of its own CS sessions through the CS network.

The SCC AS starts to accept the MSC (Mobile Switching Center) to control the media-A business. The MSC and the SCC AS can use the Dialog ID (Session ID) to identify the CS session. The Dialog ID is generally composed of the Call ID+From tag in the SIP message. +to tag composition.

The SCC AS may also send a re-Invite or Update message to the MSC, in which the MSC is instructed to start accepting the service request initiated by UE-2 on the media stream of the CS session (such as maintaining the session, adding media streams, etc.). After receiving the message, the MSC will correspond the Dialog ID in the request message with the TI (Transaction Identifier, transaction identifier) of the CS domain, and start to accept the CS session service request corresponding to the TI initiated by UE-2.

S106. The SCC AS returns a confirmation message to UE-1.

After the SCC AS starts to accept the service control of the CS session by the MSC, it sends a 200OK message to UE-1 for confirmation.

S107. Delete the Collaborative Session Control of UE-1.

The request to delete the control right can be initiated by the SCC AS or by UE-1 itself. After deleting the Collaborative Session Control of UE-1, UE-1 becomes the controller UE, and UE-2 becomes the controller UE. Subsequent UE-2 will perform service control on Media-A on the CS network, and perform service control on other sessions on the PS network.

S108-S109. The SCC AS updates the peer session branch.

The SCC AS can notify the remote UE of the change of the control right of the local UE, and this step is optional.

It should be noted that the above S103-S104 can also be replaced by the following steps S103a-S104a, the final result of which is consistent with the final result of S103-S104, that is, let UE-2 have a joint session other than Media-A Control:

S103a. The SCC AS sends a refer message to UE-2, in which the refer message includes status information of each media stream in the current Collaborative session except Media-A;

S104a. UE-2 sends an Invite message to the SCC AS according to the refer message, requesting to establish a new Collaborative Session Control.

This embodiment provides a method for transferring the joint session control right Collaborative Session Control to SCUE. Since the CS session and the Collaborative Session Control belong to the same UE after the transfer is completed, it needs to be separated from the Collaborative Session Control Signaling of the PS domain first. / Delete the control right of the CS media stream, and then transfer the remaining control right to the target UE. After the transfer is completed, the CS session will be controlled by the target UE through the CS network.

In this embodiment, after the transfer is judged by the SCC AS, the CS session and the CollaborativeSession Control will belong to the same UE, and a subsequent process of separating/deleting the control right is initiated. Those skilled in the art can understand that the above determination can also be completed by the UE initiating the transfer, and the transfer request carries an indication about the separation/deletion control right.

The media-A and media-B in this embodiment are used as typical types of media streams for illustrative purposes only. Those skilled in the art can understand that there may be more UEs at the local end, and each UE’s The media stream is also not limited to one. During the transfer of Collaborative Session Control, the real-time sessions of other UEs at the local end will not be affected, such as media-B shown in Figure 1.

Embodiment two:

Assuming that UE-1 and UE-2 are local user equipment, UE-1 and UE-2 have real-time media streams media-B and media-A with Remote-UE respectively, and media-B and media-A constitute the current Collaborative Session . Among them, UE-1 is the SC UE, the current UE-1 is the controller UE, and UE-2 is the controller UE.

This embodiment provides a method for transferring media-A of UE-2 to the CS domain of UE-1, as shown in FIG. 2 , including the following steps:

S201. UE-1 initiates a media stream transfer request to the SCC AS, requesting to transfer media-A to UE-2, and the request can reach the SCC AS through the S-CSCF. The request message can use messages such as refer, re-Invite, or Update.

In the request message, a specific message header needs to be carried to indicate the transfer operation of the media stream. For example, if the IUT-Transfer (inter-user equipment transfer) message header is used, it is used to indicate the specific message header for the transfer of the session control right The format can be IUT-Transfer: <Media Transfer>.

The state information of the media stream to be transferred is carried in the message body of the request message, and the state information may include the type of media stream (such as voice, video, data, etc.), encoding mode, and the identification of the UE where the media stream is currently located (such as GRUU, IP Address, etc.), etc., the message body can use SDP or XML and other forms.

S202-S203. The SCC AS requests the transfer target UE to establish a media stream.

The SCC AS determines that the transfer target is currently the controller UE, and needs to transfer the media stream media-A to be transferred to the CS domain of the target UE, so it is necessary to establish the CS media stream of the target UE through the MSC:

The SCC AS first sends an Invite message to the MSC. After receiving the message, the MSC further sends a Setup message to UE-1 to establish media-A.

S204-S205. UE-1 returns a confirmation message to the SCC AS.

After media-A is established, UE-1 first sends a Connect message to MSC, and after MSC receives the message, it further sends a 200 OK message to SCC AS for confirmation.

S206. The SCC AS returns a confirmation message to UE-1 for the message of S201.

S207-S208. The SCC AS updates the peer session branch.

The SCC AS notifies the peer UE of the session transfer of the local UE.

S209. The SCC AS releases the media stream on UE-2.

The SCC AS deletes the media stream media-A from UE-2.

S210. Delete the control right of UE-1 to Media-A.

Since the SC UE cannot control the service of its own CS media stream, it needs to separate/delete the control right to Media-A in the existing Collaborative Session Control Signaling of UE-1, that is, the m lines corresponding to Media-A (media row) port is set to 0.

The request to delete the control right may be initiated by the SCCAS or by UE-1 itself. After the deletion is completed, UE-1 will perform service control on Media-A on the CS network, and perform service control on media streams of other sessions on the PS network.

S211. The SCC AS starts to accept the service control on media-A initiated by the CS network.

SCC AS starts to accept MSC's service control on media-A internally. MSC and SCC AS can use Dialog ID (session identifier) to identify CS session. Dialog ID is generally composed of Call ID+From tag+to tag in SIP message composition.

The SCC AS can also send a re-Invite or Update message to the MSC, in which the MSC is instructed to start accepting the service request initiated by UE-2 on the CS session (such as maintaining the session, adding media streams, etc.). After receiving the message, the MSC will correspond the Dialog ID in the request message with the TI (Transaction Identifier, transaction identifier) of the CS domain, and start to accept the CS session service request corresponding to the TI initiated by UE-2.

This embodiment provides a method for transferring media streams to the CS domain of the SC UE. Compared with Embodiment 1, although the transferred object is different, after the transfer is completed, the CS session will also be in the same UE as the Collaborative SessionControl. Therefore, it is also necessary to separate/delete the control right of the CS media stream from the current Collaborative SessionControl Signaling. After the transfer is completed, the CS media flow will be controlled by the target UE through the CS network.

In this embodiment, after the transfer is judged by the SCC AS, the CS session and the CollaborativeSession Control will belong to the same UE, and a subsequent process of separating/deleting the control right is initiated. Those skilled in the art can understand that the above judgment can also be completed by the UE that initiates the transfer, and the transfer request carries an indication about the separation/deletion control right.

The media-A and media-B in this embodiment are used as typical types of media streams for illustrative purposes only. Those skilled in the art can understand that there may be more UEs at the local end, and each UE’s The media stream is also not limited to one. During the transfer of the media stream to the CS domain, the real-time sessions of other UEs at the local end will not be affected, such as media-B shown in Figure 2 .

Embodiment three:

Assuming that UE-1 and UE-2 are local user equipment, UE-1 and UE-2 have real-time media streams media-B and media-A with Remote-UE respectively, and media-B and media-A constitute the current Collaborative Session . Among them, UE-1 is the SC UE, the current UE-1 is the controller UE, and UE-2 is the controller UE.

In practical applications, user equipment may switch between access networks with different functions. For example, when user equipment switches from a PS1 network that supports VOIP (Voice over Internet Protocol, IP network voice transmission) to a PS2 network that does not support VOIP, it is necessary to transfer the voice services originally carried on the PS1 network to the CS network to ensure service continuity. continuity. For example, when the user equipment is handed over from the WLAN network to the GPRS network, since the GPRS network does not support VOIP, it is necessary to transfer related voice services to the GSM network.

In response to the above requirements, this embodiment provides a method for transferring media-A of the PS1 network to the CS network when the UE-1 is switched from the PS1 network to the PS2/CS network, as shown in FIG. 3 , including the following steps:

S301. UE-1 initiates a call request in the PS2 network, and includes an STI (SessionTransfer Identifier, session transfer identifier) in the call request to instruct inter-access handover. The call request message can use the Invite message.

The message body of the request message carries the status information of each media stream in the current Collaborative session except Media-A. And in the existing Collaborative Session Control Signaling, separate/delete the control right to Media-A, that is, set the port of m row (media row) corresponding to Media-A to 0.

S302-S303. The SCC AS establishes a new Collaborative session control on the PS2 network, and updates the peer session branch. Subsequent UE-1 will perform service control on media streams of other sessions on the PS2 network.

S304. The SCC AS returns a confirmation message to UE-1.

S305-S306. UE-1 initiates a call request in the CS network, and includes an STN (Session Transfer Number) in the call request to indicate switching between access networks.

UE1 first sends a Setup message carrying an STN to the MSC. After receiving the message, the MSC further sends an Invite message to the SCC AS to request the establishment of media-A.

S307-S308. The SCC AS updates the peer session branch.

S309-S310. The SCC AS returns a confirmation message to the MSC, and the MSC further sends a Connect message to UE-1 after receiving the message.

S311. Delete the Collaborative Session Control of the UE-1 on the PS1 network.

The request to delete the control right can be initiated by the SCC AS or by UE-1 itself.

The SCC AS can also notify UE-2 of changes in the controller UE (this step is optional and not shown in Figure 3).

This embodiment provides a method for transferring media-A of the PS1 network to the CS network when UE-1 is handed over from the PS1 network to the PS2/CS network. Similar to the situation of Embodiment 1 and Embodiment 2, during the transfer process, it is also necessary to separate/delete the control right of the CS media stream from the current Collaborative Session Control Signaling. After the transfer is completed, the remaining PS media streams in the Collaborative Session are controlled by UE-1 through the PS2 network, and the CS media streams are controlled by UE-1 through the CS network.

In this embodiment, UE-1 judges that after the transfer is completed, the CS session and the Collaborative SessionControl will belong to the same UE, and the transfer request carries an indication about the separation/deletion control right. Those skilled in the art can understand that the transfer request may not carry an indication about the separation/deletion of the control right, but the SCC AS completes the judgment and initiates the subsequent process of separation/deletion of the control right.

The media-A and media-B in this embodiment are used as typical types of media streams for illustrative purposes only. Those skilled in the art can understand that there may be more UEs at the local end, and each UE’s The media stream is also not limited to one. During inter-network handover of UE-1, the original session on the PS1 network will be transferred to the PS2 network, while the real-time sessions of other UEs at the local end will not be affected, such as media-B shown in Figure 3.

Embodiment four:

Assuming that UE-1 and UE-2 are local user equipments, UE-1 and UE-2 respectively have real-time media streams media-A and media-B with Remote-UE (peer UE). Among them, UE-1 is the SC UE, media-A is the CS media stream, currently UE-1 is the controller UE, and UE-2 is the controller UE.

This embodiment provides a method for transferring the Collaborative Session Control of UE-1 to UE-2, as shown in Figure 4, including the following steps:

S401. UE-1 initiates a control right transfer request to the SCCAS, requesting to transfer the Collaborative SessionControl to UE-2, and the request can reach the SCC AS through the S-CSCF. The request message can use messages such as refer, re-Invite, or Update.

In the request message, a specific message header needs to be carried to indicate the transfer operation of the session control right. For example, if the IUT-Transfer (inter-user equipment transfer) message header is used, it is used to indicate the specific message for the transfer of the session control right. The header format can be as follows:

IUT-Transfer: <Session Control Transfer>.

The message body of the request message can be used to carry the status information of the media stream. On the basis of the Collaborative Session Control Signaling in the current PS network, the description of Media-A should be merged/added, and Media-A can be used as the first media Stream description or last media description. The status information may include the type of media stream (such as voice, video, data, etc.), encoding method, and the ID of the UE where the media stream currently resides (such as GRUU, IP address, etc.), and the message body may use SDP or XML.

It should be noted that UE-1 may not provide the CollaborativeSession information to the SCC AS in this step, and in the subsequent steps, the SCC AS will process according to the CollaborativeSession information saved by itself.

S402. The SCC AS sends a control right transfer-in request to UE-2, requesting to transfer the Collaborative SessionControl to UE-2, and the request can reach UE-2 through the S-CSCF. The request message may use an Invite (invitation) message, and the message body may use an SDP format.

Transfer to UE-2's Collaborative Session Control, including the control of Media-A. The SCC AS may send a control right transfer request to UE-2 according to the media stream status information provided by UE-1 in S401. If in S301, UE-1 does not provide media stream status information to the SCC AS, then the SCC AS will combine the relevant information of Media-A according to the media stream status information of the current Collaborative session saved by itself, and send it to UE-2 Transfer of control to the request. The description of Media-A can be used as the first media stream description or the last media description.

S403. UE-2 returns a confirmation message to the SCC AS.

S404. The SCC AS stops accepting the service control on media-A initiated by the CS network.

The SCC AS stops accepting MSC's service control on media-A internally, and the Dialog ID (session identifier) can be used to identify the CS session between the MSC and the SCC AS. The Dialog ID is generally composed of Call ID+From tag+to tag in the SIP message composition.

The SCC AS may also send a re-Invite or Update message to the MSC, in which the MSC is instructed to stop accepting the service request initiated by UE-2 on the CS session (such as maintaining the session, adding media streams, etc.). After receiving the message, the MSC corresponds the Dialog ID in the request message to the TI (Transaction Identifier, transaction identifier) of the CS domain, and stops accepting the CS session service request initiated by UE-2 and corresponding to the TI.

S405. The SCC AS returns a confirmation message to UE-1.

After the SCC AS stops accepting the service control of the CS session by the MSC, it sends a 200 OK message to UE-1 for confirmation.

S406. Delete the Collaborative Session Control of UE-1.

The request to delete the control right can be initiated by SCCAS or by UE-1 itself. After UE-1’s Collaborative Session Control is deleted, UE-1 becomes the controller UE, and UE-2 becomes the controller UE. Subsequent UE-2 will perform service control on the CollaborativeSession including media-A on the PS network.

S407-S408. The SCC AS updates the peer session branch.

The SCC AS can notify the remote UE of the change of the control right of the local UE, and this step is optional.

It should be noted that the above S402-S403 can also be replaced by the following steps S402a-S402b, and the final result is consistent with the final result of 302-S403, that is, let UE-2 have a joint session including Media-A Control of:

S402a. The SCC AS sends a refer message to UE-2, in which the refer message carries the status information of each media stream in the Collaborative session including Media-A;

S403a. UE-2 sends an Invite message to the SCC AS according to the refer message, requesting to establish a new Collaborative Session Control.

This embodiment provides a method for transferring the Collaborative Session Control out of the SCUE. Corresponding to Embodiment 1, since the CS session and the CollaborativeSession Control will be in different UEs after the transfer is completed, it is necessary to merge/increase the control right of the CS media stream in the current Collaborative Sessioncontrol Signaling, and then transfer the newly established control After the transfer is completed, the CS media stream will be controlled by the SC UE through the PS network.

In this embodiment, after the transfer is judged by the SCC AS, the CS session and the CollaborativeSession Control will belong to different UEs, and the subsequent merge/increase control process will be initiated. Those skilled in the art can understand that the above judgment can also be initiated by the transfer The UE completes it, and carries the instruction about merging/increasing the control rights in the transfer request.

The media-A and media-B in this embodiment are used as typical types of media streams for illustrative purposes only. Those skilled in the art can understand that there may be more UEs at the local end, and each UE’s The media stream is also not limited to one. During the transfer of Collaborative Session Control, the real-time sessions of other UEs at the local end will not be affected, such as media-B shown in Figure 4.

Embodiment five:

Assuming that UE-1 and UE-2 are local user equipments, UE-1 and UE-2 have real-time media streams media-A and media-B with Remote-UE respectively, where UE-1 is SC UE, and UE-1 is currently It is the controller UE, and UE-2 is the controller UE.

This embodiment provides a method for transferring the CS domain media stream media-A of UE-1 to UE-2, as shown in FIG. 5 , including the following steps:

S501. UE-1 initiates a media stream transfer request to the SCC AS, requesting to transfer media-A to UE-2, and the request can reach the SCC AS through the S-CSCF. The request message can use messages such as refer, re-Invite, or Update.

In the request message, a specific message header needs to be carried to indicate the transfer operation of the media stream. For example, if the IUT-Transfer (inter-user equipment transfer) message header is used, it is used to indicate the specific message header for the transfer of the session control right The format can be IUT-Transfer: <Media Transfer>.

The state information of the media stream to be transferred is carried in the message body of the request message, and the state information may include the type of media stream (such as voice, video, data, etc.), encoding mode, and the identification of the UE where the media stream is currently located (such as GRUU, IP Address, etc.), etc., the message body can use SDP or XML and other forms.

It should be noted that if the refer message is used, only the description of the media stream to be transferred can be carried in the message body; if the re-Invite message is used, an m line can be added to the existing SDP to describe the media -A message.

S502. The SCC AS requests the transfer target UE to establish a media stream.

The SCC AS sends an Invite or re-Invite message to UE-2, requesting to establish Media-A.

S503. UE-2 returns a confirmation message to the SCC AS.

After media-A is established, UE-2 sends a 200OK message to SCC AS for confirmation.

S504. The SCC AS returns a confirmation message to UE-1 for the message of S501.

S505-S506. The SCC AS updates the peer session branch, and notifies the peer UE of the session transfer status of the local UE.

S507. The SCC AS releases the media stream on UE-1.

The SCC AS deletes the media stream media-A from UE-1.

S508. Increase the control right of UE-1 to Media-A.

After the CS media stream media-A is transferred to UE-2, UE- can control its services through the PS network. The request to increase the control right can be initiated by the SCC AS or by UE-1 itself. That is, on the basis of the existing Collaborative Session Control Signaling, merge/increase the control over Media-A. After the increase of control rights is completed, UE-1 will control the services of the Collaborative Session including Media-A on the PS network.

It should be noted that the above S502-S503 can also be replaced by the following steps S502a-S502b:

S502a. The SCC AS sends a refer message to UE-2, in which the refer message carries the state information of Media-A;

S503a. UE-2 sends an Invite message to the SCC AS according to the refer message, requesting to establish a new Collaborative Session Control.

This embodiment provides a method for transferring media streams out of the CS domain of the SC UE. Corresponding to Embodiment 5, after the transfer is completed, the CS session and the Collaborative Session Control will be in different UEs, so it is necessary to merge/increase the control right of the CS media stream in the current Collaborative Session control Signaling of UE-1, and the transfer is completed Afterwards, the CS media flow will be controlled by the SC UE through the PS network.

In this embodiment, UE-1 judges that after the transfer is completed, the CS session and the Collaborative SessionControl will belong to different UEs, and the transfer request carries an indication about merging/increasing control rights. Those skilled in the art can understand that the transfer request may not carry the indication about merging/increasing the control right, but the SCC AS completes the judgment and initiates the subsequent merging/increasing the control right process.

The media-A and media-B in this embodiment are used as typical types of media streams for illustrative purposes only. Those skilled in the art can understand that there may be more UEs at the local end, and each UE’s The media stream is also not limited to one. During the process of transferring the media stream out of the CS domain, the real-time sessions of other UEs at the local end will not be affected, such as media-B shown in FIG. 5 .

Embodiment six:

Assuming that UE-1 and UE-2 are local user equipments, UE-1 and UE-2 respectively have real-time media streams media-B and media-A with Remote-UE, and media-A is a CS domain media stream. Among them, UE-1 is the SC UE, the current UE-1 is the controller UE, and UE-2 is the controller UE.

Corresponding to Embodiment 3, this embodiment provides a method for transferring media-A of the CS network to the PS2 network when UE-1 is switched from the PS1/CS network to the PS2 network, as shown in FIG. 6 , including the following steps:

S601. UE-1 initiates a call request in the PS2 network, and includes an STI (SessionTransfer Identifier, session transfer identifier) in the call request to indicate switching between access networks. The call request message can use the Invite message.

The message body of the request message carries the state information of each media stream in the current Collaborative session, as well as the state information of Media-A. That is, in the request message, it is necessary to merge/increase the control over Media-A on the basis of the current Collaborative Session Control Signaling.

S602-S603. The SCC AS establishes a new Collaborative session control on the PS2 network, and updates the peer session branch. Subsequent UE-1 will control the Collaborative session including Media-A on the PS2 network.

S604. The SCC AS returns a confirmation message to UE-1.

S605. Delete the Collaborative Session Control of the UE-1 on the PS1 network and the media stream Media-A on the CS network.

The request to delete the control right can be initiated by the SCC AS or by UE-1 itself.

The SCC AS can also notify UE-2 of the change of the controller UE (this step is optional, not marked in Figure 6).

This embodiment provides a method for transferring media-A of the CS network to the PS2 network when UE-1 is handed over from the PS1/CS network to the PS2 network. It is necessary to merge/increase the control right of the CS media stream in the current Collaborative Session controlSignaling. After the transfer is completed, UE-1 will control the business of the Collaborative Session including Media-A on the PS2 network.

In this embodiment, UE-1 judges that after the transfer is completed, the CS session and the Collaborative SessionControl will belong to different UEs, and the transfer request carries an indication about merging/increasing control rights. Those skilled in the art can understand that the transfer request may not carry the indication about merging/increasing the control right, but the SCC AS completes the judgment and initiates the subsequent merging/increasing the control right process.

The media-A and media-B in this embodiment are used as typical types of media streams for illustrative purposes only. Those skilled in the art can understand that there may be more UEs at the local end, and each UE’s The media stream is also not limited to one. During inter-network handover of UE-1, the original session on the PS1 network will be transferred to the PS2 network, while the real-time sessions of other UEs at the local end will not be affected, such as media-B shown in Figure 6.

The above embodiments respectively introduce the transfer methods of media streams and control rights in different application scenarios. On the basis of existing technologies, the transfer of CS media streams and joint session control rights between different UEs is further realized. Applying the above Technical solution, a UE with both PS capability and CS capability can also realize the complete media stream transfer function, and can become a controller UE to further implement operations such as transfer, deletion, addition, and service supplementation of media streams in joint sessions, so that The user experience has been significantly improved.

In the above-mentioned embodiments, each embodiment is mainly described to be different from other embodiments, and the same or similar parts between the various embodiments can be referred to each other. Those of ordinary skill in the art can understand that all or part of the steps for realizing the above-mentioned method embodiments can be completed by hardware related to program instructions, and the aforementioned program can be stored in a computer-readable storage medium. When the program is executed, the It includes the steps of the above method embodiments; and the aforementioned storage medium includes: ROM, RAM, magnetic disk or optical disk and other various media that can store program codes.

Corresponding to the above method embodiment, the embodiment of the present invention also provides a session-related information transfer device, as shown in FIG. 7 , including:

The judging unit 710 is configured to judge whether there is an increase or decrease of the circuit-switched CS media stream on the master user equipment controller UE before and after the transfer of the session-related information is completed;

A control right updating unit 720, configured to update the Collaborative Session Control when the judging result of the judging unit is yes;

A transfer unit 730, configured to transfer the session-related information after the control right updating unit 720 updates the session control right;

The session-related information transfer device provided above may be user equipment UE, or IMS network-side equipment such as SCC AC, that is, each of the above-mentioned functional units may be located in the UE or in the network-side equipment. Of course, those skilled in the art can understand that the above functional units may also be distributed in the UE and the network side device.

The session-related information transfer device provided above realizes the transfer of CS media streams and joint session control rights between different UEs on the basis of the existing technology. By applying the above technical solutions, UEs with both PS and CS capabilities can also It can realize complete media stream transfer, and can become a controller UE to further implement operations such as transfer, deletion, addition, and service supplementation of media streams in joint sessions, which significantly improves user experience.

Wherein, the control right updating unit 720 may specifically include:

The deletion subunit is used to delete/separate the control right to the CS media flow from the current joint session control right signaling when a CS media flow is added to the master user equipment;

A subunit is added, configured to add/combine the control right of the CS media flow in the current joint session control right signaling when the CS media flow is reduced on the master user equipment.

Referring to shown in Figure 8, when the session-related information transfer device is SCC AC, the device can also include:

CS media stream service control unit 740,

After the control right updating unit 720 deletes the control right of the CS media flow from the current joint session control right, start accepting the service control of the CS media flow initiated by the CS network;

and

After the control right updating unit 720 adds the control right to the CS media flow in the current joint session control right, stop accepting the service control on the CS media flow initiated by the CS network.

Wherein, the CS media stream service control unit 740 may specifically include:

The first indication subunit is configured to instruct the mobile switching center MSC to start accepting the CS network initiated by the user equipment after the control right update unit 720 deletes the control right to the CS media stream from the current joint session control right Service control on the CS media stream.

The second indication subunit is configured to instruct the MSC to stop accepting the CS network initiated by the user equipment in the CS network after the control right update unit 720 increases the control right to the CS media flow in the current joint session control right. Service control of CS media streams.

The device provided above can delete/separate, or add/merge, the control signaling of the current PS network according to the increase or decrease of the CS media stream on the controller UE, and the separated CS media stream will be sent by the CS network For service control, the same reason, after merging the CS media stream, the CS network will stop the service control of the media stream.

As for the device embodiment, since it basically corresponds to the method embodiment, the description is relatively simple, and for relevant parts, please refer to part of the description of the method embodiment. The device embodiments described above are only illustrative, and the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in One place, or it can be distributed to multiple network elements. Part or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. It can be understood and implemented by those skilled in the art without creative effort.

The foregoing is only a specific embodiment of the present invention. It should be pointed out that for those of ordinary skill in the art, some improvements and modifications can also be made without departing from the principle of the present invention. It should be regarded as the protection scope of the present invention.

Claims (14)

1. the transfer method of a session related information is characterized in that, comprising:

Judge whether session related information shifts before and after the completion, have the increase and decrease of circuit switching (CS) Media Stream on the main controlling user equipment controller UE;

If then upgrade associating conversation control power Collaborative Session Control, and said session related information shifted;

Wherein, said session related information comprises: associating conversation control power or Media Stream;

Said main controlling user equipment is: have the subscriber equipment of associating conversation control power, main controlling user equipment changes with the transfer of associating conversation control power.

2. method according to claim 1 is characterized in that,

When having increased the CS Media Stream on the main controlling user equipment; Said renewal associating conversation control power comprises: from current associating conversation control power signaling Collaborative Session Control Signaling, deletion or separation are to the control of said CS Media Stream;

When having reduced the CS Media Stream on the main controlling user equipment, said renewal associating conversation control power comprises: in current associating conversation control power signaling, increase or merging are to the control of said CS Media Stream.

3. method according to claim 1 and 2 is characterized in that, the transfer of said session related information comprises:

Between subscriber equipment, shift the associating conversation control power,

Between subscriber equipment transferring media stream,

Or when network switches, transferring media stream between packet switching PS network and CS network.

4. method according to claim 3; It is characterized in that, when between subscriber equipment, shifting associating conversation control power or Media Stream, before and after said judgement session related information shifts and accomplishes; Whether the increase and decrease of circuit switching (CS) Media Stream is arranged on the main controlling user equipment, comprising:

Receive the session related information transfer request message that subscriber equipment sends; In the said session related information transfer request message, comprise the message header that is used to indicate the session related information transfer;

According to said session related information transfer request message, judge whether session related information shifts before and after the completion, have the increase and decrease of circuit switching (CS) Media Stream on the main controlling user equipment.

5. method according to claim 4 is characterized in that, said message header is IUT-Transfer;

Pass through IUT-Transfer: the transfer of < Session Control Transfer>indication associating conversation control power;

Pass through IUT-Transfer: the transfer of Media Stream is carried out in < Media Transfer>indication.

6. method according to claim 4 is characterized in that, when between subscriber equipment, shifting the associating conversation control power, said renewal associating conversation control power comprises:

According to the state information of each Media Stream in the associating session of self preserving, upgrade the associating conversation control power; Or

According to the state information of each Media Stream in the associating session that subscriber equipment provided, upgrade the associating conversation control power; Wherein, the state information of each Media Stream is carried in the message body of said session related information transfer request message in the said associating session.

7. method according to claim 4 is characterized in that, between subscriber equipment, during transferring media stream, in the message body of said session related information transfer request message, carries the state information of Media Stream to be transferred.

8. according to claim 6 or 7 described methods, it is characterized in that the state information of said Media Stream comprises:

The sign of the type of Media Stream, the coded system of Media Stream and/or the current place of Media Stream subscriber equipment.

9. method according to claim 2 is characterized in that,

From current associating conversation control power signaling, after the control of deletion to said CS Media Stream, also comprise: begin to be received in the business control that the CS network is initiated said CS Media Stream;

In current associating conversation control power signaling, increase after the control to said CS Media Stream, also comprise: stop to be received in the business control that the CS network is initiated said CS Media Stream.

10. method according to claim 9 is characterized in that,

Saidly begin to be received in the business that the CS network initiates and be controlled to be said CS Media Stream:

The indication moving exchanging center MSC begins to accept the business control to said CS Media Stream that subscriber equipment is initiated at the CS network;

Saidly stop to be received in the business that the CS network initiates and be controlled to be said CS Media Stream:

Instruct MS C stops to accept the business control to said CS Media Stream that subscriber equipment is initiated at the CS network.

11. a session related information transfer device is characterized in that, comprising:

Judging unit is used to judge that session related information shifts before and after the completion, and whether the increase and decrease of circuit switching (CS) Media Stream is arranged on the main controlling user equipment controllerUE;

The control updating block, be used for when the judged result of said judging unit when being, upgrade associating conversation control power Collaborative Session Control;

Buanch unit is used for after said control updating block upgrades the associating conversation control power, said session related information being shifted;

Wherein, said session related information comprises: associating conversation control power or Media Stream;

Said main controlling user equipment is: have the subscriber equipment of associating conversation control power, main controlling user equipment changes with the transfer of associating conversation control power.

12. device according to claim 11 is characterized in that, said control updating block comprises:

The deletion subelement is used for when having increased the CS Media Stream on the main controlling user equipment, and from current associating conversation control power signaling Collaborative Session Control Signaling, deletion or separation are to the control of said CS Media Stream;

Increase subelement, be used for when having reduced the CS Media Stream on the main controlling user equipment, in current associating conversation control power signaling, increase or merging are to the control of said CS Media Stream.

13. device according to claim 12 is characterized in that, also comprises:

CS media stream service control unit,

Be used at said control updating block after the current control of associating conversation control power deletion, beginning to be received in the business control that the CS network is initiated to said CS Media Stream to said CS Media Stream;

With

Said control updating block increases the control to said CS Media Stream in current associating conversation control power after, stop to be received in the business control that the CS network is initiated to said CS Media Stream.

14. device according to claim 13 is characterized in that, said CS media stream service control unit comprises:

The first indication subelement; Be used at said control updating block after the current control of associating conversation control power deletion to said CS Media Stream, the indication moving exchanging center MSC begins to accept the business control to said CS Media Stream that subscriber equipment is initiated at the CS network;

The second indication subelement is used at said control updating block after current associating conversation control power increases the control to said CS Media Stream, and instruct MS C stops to accept the business control to said CS Media Stream that subscriber equipment is initiated at the CS network.

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