WO2010127604A1 - 会话转移方法、装置和系统 - Google Patents

会话转移方法、装置和系统 Download PDF

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Publication number
WO2010127604A1
WO2010127604A1 PCT/CN2010/072372 CN2010072372W WO2010127604A1 WO 2010127604 A1 WO2010127604 A1 WO 2010127604A1 CN 2010072372 W CN2010072372 W CN 2010072372W WO 2010127604 A1 WO2010127604 A1 WO 2010127604A1
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WO
WIPO (PCT)
Prior art keywords
conference
session
user equipment
switched domain
domain
Prior art date
Application number
PCT/CN2010/072372
Other languages
English (en)
French (fr)
Inventor
衣强
金辉
龙水平
段小嫣
Original Assignee
华为终端有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 华为终端有限公司 filed Critical 华为终端有限公司
Priority to EP10772007.0A priority Critical patent/EP2421218B1/en
Publication of WO2010127604A1 publication Critical patent/WO2010127604A1/zh
Priority to US13/289,771 priority patent/US9392032B2/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/10—Architectures or entities
    • H04L65/1016—IP multimedia subsystem [IMS]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/1066—Session management
    • H04L65/1083—In-session procedures
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/1066—Session management
    • H04L65/1083—In-session procedures
    • H04L65/1095—Inter-network session transfer or sharing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/40—Support for services or applications
    • H04L65/403—Arrangements for multi-party communication, e.g. for conferences
    • H04L65/4046—Arrangements for multi-party communication, e.g. for conferences with distributed floor control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/01—Protocols
    • H04L67/04—Protocols specially adapted for terminals or networks with limited capabilities; specially adapted for terminal portability
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/14—Session management
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H04W36/0022—Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies
    • H04W36/00224—Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies between packet switched [PS] and circuit switched [CS] network technologies, e.g. circuit switched fallback [CSFB]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/42—Systems providing special services or facilities to subscribers
    • H04M3/4228—Systems providing special services or facilities to subscribers in networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/42—Systems providing special services or facilities to subscribers
    • H04M3/56—Arrangements for connecting several subscribers to a common circuit, i.e. affording conference facilities
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13098—Mobile subscriber
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H04W36/0027—Control or signalling for completing the hand-off for data sessions of end-to-end connection for a plurality of data sessions of end-to-end connections, e.g. multi-call or multi-bearer end-to-end data connections

Definitions

  • the present invention relates to the field of communications, and in particular, to a session transfer method, apparatus, and system.
  • the user equipment can be connected to the communication peer through a Circuit Switched (CS) domain or a Packet Switched (PS) domain: when the UE performs a session through the CS domain, the network side service A Centralization and Continuity Application Server (SCC AS) establishes a CS domain-based access leg for the session, the session being under the control of the CS domain-based access leg For the same reason, when the UE performs a session through the PS domain, the SCC AS establishes a PS domain-based access leg for the session, and the session is performed through the PS domain under the control of the PS domain-based access leg.
  • CS Circuit Switched
  • PS Packet Switched
  • the session of the UE When the UE transitions, such as from the area controlled by the PS domain to the area controlled by the CS domain, or from the area controlled by the CS domain to the area controlled by the PS domain, the session of the UE also needs to be transferred.
  • the UE sends a session transfer request to the SCC AS, and the SCC AS establishes an access leg based on the target network for the transfer request according to the session transfer request, and releases the access leg of the source network. It is carried out through the target network under the control of the access leg based on the target network.
  • the inventor has found that the prior art has at least the following problems: if the UE in which the transfer occurs includes at least one session belonging to the conference, and the UE is the initiator of the conference, through the prior art After the provided method transfers the session of the UE, it may cause a problem that the control cannot be controlled.
  • Embodiments of the present invention provide a session transfer method, apparatus, and system, which are capable of controlling a conference to which a session belongs after a session transfer.
  • the embodiment of the present invention adopts the following technical solution: A method for transferring a tongue and a tongue, including: a process of transferring a user device from a source network to a target network, determining whether the user equipment includes at least one belonging a session of the conference; if the user equipment includes at least one session belonging to the conference, the related information of the conference is sent to the user equipment or the mobile switching center server.
  • a session transfer method includes: a process of transferring a session of a user equipment from a packet switched domain to a circuit switched domain, and acquiring a service set and a session continuity application server in a case where the user equipment includes at least one session belonging to a conference
  • the related information of the conference is sent, and the related information of the conference is used to control the conference; and the conference state is established for the session belonging to the conference according to the related information of the conference.
  • a session transfer method comprising: transferring a session of a user equipment from a circuit switched domain to a packet handover
  • the conference universal resource identifier of the conference sent by the service aggregation and the session continuity application server is obtained, where the conference universal resource identifier is used.
  • the user equipment controls the conference.
  • a session transfer method includes: transmitting, in a process of transferring a session of a user equipment from a packet switched domain to a circuit switched domain, a transfer request of a circuit switched domain to a mobile switching center server, so that the network side transfers the session of the user equipment Go to the circuit switched domain, and if the user equipment includes at least one session belonging to the conference, send related information of the conference to the mobile switching center server; send circuit switched domain signaling to the mobile switching center server,
  • the mobile switching center server is configured to control the conference according to related information of the conference.
  • a service aggregation and session continuity application server including:
  • a determining unit configured to: in the process of transferring the user equipment from the source network to the target network, determining whether the user equipment includes at least one session belonging to the conference;
  • a sending unit configured to send the related information of the conference to the user equipment or the mobile switching center server, if the determining unit determines that the user equipment includes at least one session belonging to the conference.
  • a mobile switching center server comprising:
  • An obtaining unit configured to transfer a session of the user equipment from the packet switched domain to the circuit switched domain, where the user equipment includes at least one session belonging to the conference, obtain the service center and the session continuity application server Information about the meeting, information about the meeting Used to control the conference;
  • an establishing unit configured to establish a conference state for the conference that belongs to the conference according to the related information of the conference acquired from the acquiring unit.
  • a user equipment including:
  • An obtaining unit configured to transfer a session of the user equipment from the circuit switched domain to the packet switched domain, where the user equipment includes at least one session belonging to the conference, obtain the service center and the session continuity application server
  • the conference universal resource identifier of the conference where the conference universal resource identifier is used to control the conference.
  • a user equipment including:
  • a first sending unit in a process for transferring a session of the user equipment from the packet switched domain to the circuit switched domain, sending a transfer request of the circuit switched domain to the mobile switching center server, so that the network side transfers the session of the user equipment to a circuit switched domain, and sending the related information of the conference to the mobile switching center server if the user equipment includes at least one session belonging to the conference;
  • a second sending unit configured to send circuit switched domain signaling to the mobile switching center server, so that the mobile switching center server controls the conference according to related information of the conference.
  • a communication system includes: a service concentration and session continuity application server and a mobile switching center server;
  • the service aggregation and session continuity application server in the process of transferring a session of the user equipment from the packet switched domain to the circuit switched domain, if the user equipment includes at least one session belonging to the conference, to the mobile switching center server Sending information about the meeting;
  • the mobile switching center server is configured to acquire information about the conference from the service aggregation and the session continuity application server, and establish a conference state for the session belonging to the conference according to the related information of the conference, where Information about the meeting is used to control the meeting.
  • a communication system comprising: a service concentration and a session continuity application server and a user equipment; the service concentration and a session continuity application server, wherein a session of the user equipment is transferred from a circuit switched domain to a packet switched domain And if the user equipment includes at least one session belonging to the conference, sending the conference universal resource identifier of the conference to the user equipment;
  • the user equipment is configured to obtain the conference universal resource identifier from the service concentration and the session continuity application server, where the conference universal resource identifier is used to control the conference.
  • the session transfer method, device, and system provided by the embodiment of the present invention can send related information of the sense to which the tongue belongs to the user equipment or the mobile switching center server, the user equipment or the mobile switching center server in the process of the session transfer.
  • the related information of the conference can be obtained, and after the session is transferred, the conference to which the session belongs is controlled according to the conference related information, and the conference that the session belongs to cannot be in the target network after the session transfer is solved in the prior art. The issue of control.
  • FIG. 1 is a flowchart of a session transfer method according to an embodiment of the present invention
  • FIG. 2 is a flowchart of a method for transferring a tongue according to another embodiment of the present invention.
  • Embodiment 3 is a sequence diagram of a session transfer method provided by Embodiment 1 of the present invention.
  • FIG. 4 is a timing diagram of a session transfer method according to Embodiment 2 of the present invention.
  • FIG. 5 is a sequence diagram of a session transfer method provided by Embodiment 3 of the present invention.
  • FIG. 6 is a sequence diagram of a session transfer method provided by Embodiment 4 of the present invention.
  • FIG. 7 is a schematic structural diagram 1 of a service aggregation and session continuity application server according to an embodiment of the present invention.
  • FIG. 8 is a schematic structural diagram of a sending unit 702 in a service aggregation and session continuity application server according to an embodiment of the present invention shown in FIG. 7;
  • FIG. 9 is a schematic structural diagram 2 of a service aggregation and session continuity application server according to an embodiment of the present invention.
  • FIG. 10 is a schematic structural diagram of a mobile switching center server according to an embodiment of the present invention
  • FIG. 11 is a schematic structural diagram of a user equipment according to an embodiment of the present invention
  • FIG. 12 is a schematic structural diagram of a user equipment according to another embodiment of the present invention.
  • FIG. 13 is a schematic structural diagram 1 of a communication system according to an embodiment of the present invention.
  • FIG. 14 is a schematic structural diagram 2 of a communication system according to an embodiment of the present invention.
  • the embodiment of the present invention provides a method, device and system for transferring the tongue. As shown in FIG.
  • the session transfer method provided by the embodiment of the present invention includes: Step 101: In a process of transferring a session of a UE from a source network to a target network, determining whether the UE includes at least one session belonging to a conference;
  • the relationship between the network and the target network may be as follows:
  • the source target network is a PS domain/CS domain in the first network
  • the target network is a CS domain/PS domain in the first network
  • the source target network is a PS in the first network.
  • Domain/CS domain the target network is the CS domain/PS domain in the second network.
  • Step 102 If the UE includes at least one session belonging to a conference, send related information of the conference to the UE or a mobile switching center server (MSC Server).
  • MSC Server mobile switching center server
  • the transaction identifier (TI) value and the identity identification information associated with the step 102 are used, where ⁇ is used to identify different sessions;
  • the session is transferred from the CS domain to the PS domain, and the step 102 sends a conference universal resource identifier to the UE.
  • step 102 can send the ⁇ value and identity identification information associated with each participant in the conference to the MSC Server.
  • the session transfer method provided by the embodiment of the present invention may further include: acquiring and saving the TI value and the identity identification information associated with each participant in the conference.
  • the session transfer method provided by the embodiment of the present invention, in the process of the UE performing the transfer, if the UE includes at least one session belonging to the conference, the related information of the conference is sent to the UE or the MSC Server, so that the UE is Or the MSC Server can control the conference according to the related information of the conference after the session is transferred, and solve the problem that the conference to which the session belongs cannot be controlled after the session transfer in the prior art.
  • Step 201 During a process of transferring a session of a UE from a PS domain to a CS domain, if the UE includes at least one session belonging to a conference Obtaining information about the conference sent by the SCC AS, where the related information of the conference is used to control the conference;
  • the related information of the conference includes: a conference universal resource identifier, and a conference Depreciation and identity information associated with each participant;
  • Step 202 Establish a conference state for the session that belongs to the conference according to the related information of the conference.
  • the conference transfer method provided by the embodiment of the present invention, if the UE includes at least one session belonging to the conference, the related information of the conference can be obtained from the SCC AS, and the conference state is established for the session belonging to the conference, and further, after the session is transferred, The conference can be controlled according to the related information of the conference, and the problem that the meaning of the session may not be controlled after the session transition in the prior art is solved.
  • a further embodiment of the present invention further provides a conference transfer method, including: in a process of transferring a session of a UE from a CS domain to a PS domain, if the UE includes at least one session belonging to a conference, acquiring the conference sent by the SCC AS The conference universal resource identifier, where the conference universal resource identifier is used to control the conference.
  • the MSC Server can obtain the threshold value and the identity identification information associated with each participant in the conference from the SCC AS.
  • the session transfer method provided by the embodiment of the present invention may further include: The pre-stored TI values and identification information of each participant in the conference are sent to the SCC AS.
  • the conference universal resource identifier of the conference can be obtained from the SCC AS, and after the session is transferred, according to the conference universal resource identifier, The meeting is controlled to solve the existing After the session is transferred in the technology, the problem of controlling the ⁇ meaning of the tongue may not be possible.
  • a further embodiment of the present invention further provides a session transfer method, including: in a process of transferring a session of a UE from a PS domain to a CS domain, sending a CS domain transfer request to the MSC Server, so that the network side sends the session of the UE Transferring to the CS domain, and transmitting the related information of the conference to the MSC Server if the UE includes at least one session belonging to the conference; transmitting circuit switched domain signaling to the MSC Server, so that the MSC The server controls the conference according to related information of the conference.
  • the session transfer method provided by the embodiment of the present invention can send a CS domain session transfer request to the MSC Server, so that the network side transfers the session of the UE to the CS domain, and if the UE includes at least one session belonging to the conference, Sending the related information of the conference to the MSC Server, and the UE sends the CS domain control signaling, so that the MSC Server controls the conference, and after solving the handover in the prior art, the UE may not be able to I am controlling the problem.
  • Embodiment 1 The UE has only one session, the session belongs to the conference, the UE is the initiator of the conference, the UE moves from the area controlled by the PS domain to the area controlled by the CS domain, and the conference center remains in the PS domain; wherein, the PS domain is specifically based on The IP Multimedia Subsystem (IMS) domain of the PS, the UE is a UE (non lCS UE) that does not support the Gm or II interface, and the MSC in the CS domain.
  • Server has IMS Centralized Service (ICS) enhancements.
  • IMS IP Multimedia Subsystem
  • ICS IMS Centralized Service
  • the session transfer method provided by the embodiment of the present invention includes:
  • Step 301 The UE sends a session transfer request to the MSC Server, where the session transfer request carries a session transfer number (STN).
  • STN session transfer number
  • the session transfer request may be a 24.008 set up message.
  • Step 302 The MSC Server generates an Invite request according to the session transfer request sent by the UE, where the Invite request carries the identity of the STN and the UE, and sends the Invite request to the Server-Call Session Control Function (S-CSCF). .
  • S-CSCF Server-Call Session Control Function
  • the MSC Server has an ICS enhancement function, which can be registered in the IMS domain instead of the UE.
  • the MSC Server pre-registers the UE in the IMS domain, the identity of the UE is identified as an Instance ID.
  • Step 303 The S-CSCF forwards the Invite request sent by the MSC Server to the SCC AS.
  • the Invite request is a transfer request, and the session transfer is performed for the session of the UE according to the identity of the UE carried by the Invite request, including: completing establishment of a CS domain-based access leg, and using the connection information of the CS domain-based access leg
  • the remote leg is updated, and the remote branch is an access leg between the SCC AS and the communication peer of the UE.
  • Step 305 The SCC AS determines that the UE has only one session, and the session belongs to the conference, and sends an Invite reply to the S-CSCF, where the Invite reply carries the information about the conference.
  • the SCC AS pre-stores related information about the UE session, such as the number of sessions included in the UE, each session state information (activation/holding), and related information of the session to which the session belongs.
  • the SCC AS may, according to the UE identity identifier carried in the Invite request, search for related information of the session that belongs to the UE, and determine, according to the related information of the session, whether the session of the UE includes the tongue belonging to the conference.
  • the related information of the conference may include: a conference universal resource identifier, a TI value and identity identifier information associated with each participant in the conference, and the like; the SCC AS may carry related information of the conference in Invite In the session state information ( Session State Information ).
  • Step 306 The S-CSCF forwards the Invite reply sent by the SCC AS to the MSC Server.
  • Step 307 The MSC Server obtains the information about the conference from the Invite reply, establishes a conference state for the session that belongs to the conference, and adds the conference state information, for example, the session belongs to a conference (call in MPTY), where the conference related information Used to control the conference.
  • Step 308 After the session transfer of the UE is successful, the SCC AS releases the PS domain-based access leg originally established for the session of the UE, and completes the session transfer from the PS domain to the CS domain.
  • the process of the session transfer is basically the same as the process shown in FIG. 3, and the difference lies in: the transfer request of the session initiated by the MSC Server.
  • the UE and the MSC Server may transmit information through a 24.008 message or a facility message; after receiving the 24.008 message or the facility message, the MSC Server may The conference initiated by the UE is controlled according to the information about the conference acquired in step 307, such as maintaining the conference, restoring the conference, inviting the user to join the conference, terminating the conference, or releasing the conference.
  • Embodiment 2 The UE has an active state session and a hold state session, the active state session is a normal session, the hold state session belongs to the conference, the UE is the conference initiator, and the UE moves from the PS domain controlled area to the CS.
  • the area controlled by the domain, the conference center remains in the PS domain; wherein the PS domain is specifically a PS-based IMS domain, the UE is a UE (non ICS UE) that does not support the Gm or II interface, and the MSC Server in the CS domain has ICS enhancement function. .
  • the session transfer method provided by the embodiment of the present invention includes:
  • Steps 401-403 are the same as steps 301-303 shown in FIG. 3, and details are not described herein again.
  • Step 404 The SCC AS determines, according to the STN carried by the Invite request sent by the S-CSCF, that the Invite request is a transfer request, and performs session transfer, session for the session in the activated state in the UE according to the identity of the UE carried by the Invite request. For the specific steps of the transfer, refer to step 304 shown in FIG. 3, and details are not described herein again.
  • the session transfer policy may be set in advance on the SCC AS. In this embodiment, if the session transfer policy is to transfer the active state session first, and then the session in the hold state is transferred, then in step 404, if the SCC AS finds that the UE has multiple The session, the SCC AS may transfer the active state session according to the session transfer policy.
  • Step 405 The SCC AS determines that the UE includes a session belonging to the conference, and sends an Invite to the S-CSCF. Reply, carry the information about the meeting in the Invite reply.
  • the related information of the conference is carried in the session state information (Session State Information) replied by the Invite.
  • Session State Information Session State Information
  • Steps 406 and 407 are the same as steps 306 and 307 shown in Fig. 3, and are not described here.
  • Step 408 The MSC Server initiates a transfer of the hold status session to the SCC AS according to the session state information replied by the Invite.
  • the session in the hold state belongs to the conference, and in step 408, the MSC Server further establishes a conference state for the session in the hold state, and adds conference state information (call in MPTY).
  • Step 409 after the transfer of the session (including the active state session and the hold state session) of the UE is successful, the SCC AS releases the PS domain-based access leg originally established for the session of the UE (including the active state session and the hold state session). , complete the session transfer from the PS domain to the CS domain.
  • the flow of the session transfer is basically the same as the step shown in FIG. 4, and the difference is that the transfer request of the session is initiated by the MSC Server.
  • the UE and the MSC Server can transmit information through the 24.008 message or the facility message.
  • the MSC Server can control the conference initiated by the UE according to the information about the conference obtained in step 407, such as maintaining the conference and meeting. Resume, invite users to join the meeting, The party in the conference is terminated or the conference is released, and the UE can convert the session in the active state to the hold state through the hold message, and convert the session in the hold state to the active state through the facility message.
  • Embodiment 3 The UE has only one session, the session belongs to the conference, the UE is the initiator of the conference, the UE moves from the area controlled by the CS domain to the area controlled by the PS domain, and the right center remains in the CS domain;
  • the PS-based IMS domain the UE is a UE (non ICS UE) that does not support the Gm or II interface, and the MSC Server in the CS domain has an ICS enhancement function.
  • the session transfer method provided by the embodiment of the present invention includes:
  • Step 501 The UE sends an Invite request to the S-CSCF, where the Request-URI in the Invite request is set to a static STI value of the UE, where the static STI value is pre-configured in the UE, and is used to indicate a session transfer to the SCC AS. .
  • Step 502 The S-CSCF forwards the Invite request sent by the UE to the SCC AS.
  • Step 503 The SCC AS determines, according to the STI value carried by the Invite request sent by the S-CSCF, that the Invite request is a transfer request, and performs session transfer for the session of the UE according to the identity of the UE carried by the Invite request, including: Based on the establishment of the PS domain-based access leg, the remote leg is updated using the connection information of the PS domain-based access leg, and the remote branch is an access leg between the SCC AS and the communication peer of the UE.
  • Step 504 The SCC AS determines that the UE has only one session, and the session belongs to the conference, and sends an Invite reply to the S-CSCF, where the Invite reply carries the information about the conference.
  • the SCC AS pre-stores related information of the UE session, such as included by the UE.
  • the SCC AS may search for related information of the session belonging to the UE according to the identity of the UE, and determine, according to the related information of the session, whether the session of the UE includes a session belonging to the conference.
  • the related information of the conference may include: conference URI information, and the like; the SCC AS may carry related information of the conference in the session state information (Session State Information) replied by the Invite.
  • session State Information Session State Information
  • Step 505 The S-CSCF forwards the Invite reply sent by the SCC AS to the UE.
  • Step 506 The UE acquires and saves related information of the conference from the Invite reply, where the related information of the conference is used to control the conference.
  • Step 507 After the session transfer of the UE is successful, the SCC AS releases the CS domain-based access leg originally established for the session of the UE, and completes the session transfer from the CS domain to the PS domain.
  • the UE may control the conference according to the conference related information acquired in the step 506 by using PS signaling, such as maintaining the conference, restoring the conference, inviting the user to join the conference, terminating one of the parties, or releasing the conference. .
  • PS signaling such as maintaining the conference, restoring the conference, inviting the user to join the conference, terminating one of the parties, or releasing the conference.
  • the TI value and the identification information of each participant in the conference are saved on the UE and the MSC Server.
  • the SCC AS can send the TI value and the identification information of each participant in the conference to the MSC Server, and the UE needs to The SCC AS sends the TI values of each participant in the conference and Identification information, in particular, the devaluation and identification information of each participant in the conference may be carried in the step
  • Embodiment 4 The UE has an active state session and a hold state session, the active state session is a normal session, the hold state session belongs to a conference, the UE is a conference initiator, and the UE
  • the area controlled by the CS domain moves to the area controlled by the PS domain, and the conference center remains in the PS domain;
  • the PS domain is specifically a PS-based IMS domain
  • the UE is a UE that does not support the Gm or II interface (non ICS
  • the MSC Server in the CS domain has ICS enhancements.
  • the session transfer method provided by the embodiment of the present invention includes:
  • Steps 601 and 602 are the same as steps 501 and 502 shown in Fig. 5, and are not mentioned here.
  • Step 603 The SCC AS determines the STI value according to the Invite request sent by the S-CSCF.
  • the Invite request is a transfer request, and the session transfer is performed for the session in which the UE is activated according to the identity of the UE carried by the Invite request.
  • the specific transfer method refer to the steps shown in FIG.
  • the session transfer policy may be preset on the SCC AS. In this embodiment, if the session transfer policy is to transfer the session in the active state first, and then the session in the hold state is transferred, in step 603, if the SCC AS finds that the UE has multiple The session, the SCC AS may transfer the active state session according to the session transfer policy.
  • Step 604 The SCC AS determines that the UE includes a session that belongs to the conference, and sends an Invite reply to the S-CSCF, where the Invite reply carries the information about the conference.
  • the related information of the conference is carried in the session state information (Session State Information) replied by the Invite; and the method for the SCC AS to determine that the UE includes the session that belongs to the yiyi can be referred to step 504 shown in FIG. The description is not repeated here.
  • Steps 605 and 606 are the same as steps 505 and 506 shown in FIG. 5, and are not described herein again.
  • Step 607 The UE initiates a transfer of the hold status session to the SCC AS according to the session state information replied by the Invite.
  • Step 608 After the UE's session (including the active state session and the hold state session) is successfully transferred, the SCC AS releases the CS domain-based access leg that was originally established for the UE's session (including the active state session and the hold state session). , complete the session transfer from the CS domain to the PS domain.
  • the UE controls the conference by using PS signaling according to the conference-related information acquired in the step 606, such as maintaining the conference, restoring the conference, inviting the user to join the conference, terminating the conference, or releasing the conference; It is also possible to convert the active state session to the hold state by PS signaling, convert the hold state session to the active state, and the like.
  • the UE may send the TI value and the identity identification information associated with each participant in the conference to the SCC AS.
  • the TI value and the identity identification information associated with each participant in the conference may carry the SDP of the Invite request in steps 601 and 602. in.
  • the session transfer method provided by the embodiment of the present invention can send the related information of the conference to which the session belongs to the UE or the MSC Server, and the UE or the MSC Server can obtain related information of the conference, and after the session is transferred, according to the Meeting related information for the meeting to which the session belongs
  • the control solves the problem that the prior art cannot control the meaning of the session in the target network after the session is transferred.
  • the embodiment of the present invention further provides a service concentration and session continuity application server, including:
  • Determining unit 701 in the process of transferring the tongue of the user equipment from the source network to the target network, determining whether the user equipment includes at least one session belonging to the conference;
  • the sending unit 702 is configured to send the related information of the conference to the user equipment or the mobile switching center server, if the determining unit 701 determines that the user equipment includes at least one session belonging to the conference.
  • the sending unit 702 may include:
  • the first sending subunit 7021 is configured to: if the source network is a packet switched domain, the target network is a circuit switched domain, send the conference universal resource identifier to the mobile switching center server, and the threshold and identity associated with each participant in the conference Identification information;
  • the second sending subunit 7022 is configured to send the conference universal resource label to the user equipment if the source network is a circuit switched domain and the target network is a packet switched domain.
  • the service concentration and session continuity application server may further include:
  • the obtaining unit 703 is configured to acquire and save the TI value and the identifier information of each participant in the conference if the source network is a circuit switched domain and the target network is a packet switched domain.
  • the service aggregation and session continuity application server provided by the embodiment of the present invention, in the process of session transfer of the user equipment, if the session includes at least one session belonging to the conference, the related information of the conference is sent to the user equipment or moved.
  • the switching center server enables the user equipment or the mobile switching center server to control the conference according to the related information of the conference after the session is transferred, and solves the problem that the session may not belong to the session in the prior art. The problem of controlling the i.
  • an embodiment of the present invention further provides a mobile switching center server, including: an obtaining unit 1001, in a process for transferring a session of a user equipment from a packet switched domain to a circuit switched domain, if the user equipment includes At least one session belonging to the conference, obtaining information about the conference sent by the service aggregation and the session continuity application server, where the related information of the conference is used to control the conference;
  • the establishing unit 1002 is configured to establish a conference state for the session belonging to the conference according to the related information of the conference acquired from the acquiring unit 1001.
  • the mobile switching center server provided by the embodiment of the present invention can obtain the meeting from the service set and the session continuity application server if the user equipment includes at least one session belonging to the conference. And the related information of the meeting, and establishing a conference state for the session belonging to the conference, and then, after the session is transferred, the conference can be controlled according to the related information of the conference, and the session may be resolved after the session is transferred in the prior art. The problem of not being able to control the meeting to which the session belongs.
  • an embodiment of the present invention further provides a user equipment, including:
  • the obtaining unit 1101 is configured to: when the session of the user equipment is transferred from the circuit switched domain to the packet switched domain, if the user equipment includes at least one session belonging to the conference, obtain the conference sent by the service concentration and the session continuity application server.
  • the conference universal resource identifier where the conference universal resource identifier is used to control the conference.
  • the user equipment may further include:
  • the sending unit 1102 is configured to send the pre-stored threshold value and identification information of each participant in the conference to the service concentration and session continuity application server.
  • the user equipment provided by the embodiment of the present invention if at least one session belonging to the conference is included, can obtain related information of the conference from the service set and the session continuity application server, and further, according to the conference related information, after the session transfer Controlling the conference to solve the problem that the control of the ⁇ meaning of the tongue may not be controlled after the transfer of the tongue in the prior art.
  • another embodiment of the present invention further provides a user equipment, including: a first sending unit 1201, where a session for a user equipment is transferred from a packet switched domain to a circuit switch.
  • the transfer request of the circuit switched domain is sent to the mobile switching center server, so that the network side transfers the session of the user equipment to the circuit switched domain, and the user equipment includes at least one session belonging to the conference.
  • the second sending unit 1202 is configured to send a circuit switched domain signal to the mobile switching center server, so that the mobile switching center server controls the conference according to related information of the conference.
  • the user equipment provided by the embodiment of the present invention can send a CS domain session transfer request to the network side, so that the network side transfers the session of the user equipment to the circuit switched domain, and the user equipment includes at least one session belonging to the conference.
  • the related information of the conference is sent to the mobile switching center server, and the user equipment sends the CS domain control signaling, so that the mobile switching center server controls the conference, which may not be possible after the session transfer in the prior art.
  • the problem of controlling the meaning of the session is described by the embodiment of the present invention.
  • an embodiment of the present invention further provides a communication system, including: a service concentration and session continuity application server 1301 and a mobile switching center server 1302;
  • the service concentrating and session continuity application server 1301 is configured to transfer the session of the user equipment from the packet switched domain to the circuit switched domain, if the user equipment includes at least one session belonging to the conference, to the mobile
  • the switching center server 1302 sends a related letter of the meeting
  • the mobile switching center server 1302 is configured to acquire information about the conference from the service aggregation and session continuity application server 1301, and establish a conference state for the session belonging to the conference according to the related information of the conference, where The related information of the conference is used to control the conference.
  • the service aggregation and the session continuity application server can send the related information of the conference to which the session belongs to the mobile switching center server in the process of the session transfer, and the mobile switching center server can obtain the The related information of the conference is used to establish a conference state for the session that belongs to the conference, and then, after the session is transferred, the conference to which the session belongs can be controlled according to the conference related information and the conference state information, and the session transition is solved in the prior art. In the future, there is no way to control the conference to which the session belongs in the target network.
  • an embodiment of the present invention further provides a communication system, including: a service aggregation and session continuity application server 1401 and a user equipment 1402;
  • the service concentrating and session continuity application server 1401 is configured to, in the process of transferring the session of the user equipment 1402 from the circuit switched domain to the packet switched domain, if the user equipment includes at least one session belonging to the conference, The user equipment 1402 sends a conference universal resource identifier of the conference;
  • the user equipment 1402 is configured to obtain the conference universal resource identifier of the conference from the service aggregation and session continuity application server 1401, where the conference universal resource identifier is used to control the identifier.
  • the service aggregation and the session continuity application server can send the related information of the conference to which the session belongs to the user equipment in the process of the session transfer, and the user equipment can acquire and save the conference.
  • the conference to which the session belongs is controlled according to the information related to the conference, which solves the problem that the conference to which the session belongs cannot be controlled in the target network after the session is transferred in the prior art.
  • the UE involved in the embodiment of the present invention includes, but is not limited to, a UE (non ICS UE) that does not support the Gm or II interface, or an ICS UE that is not available to the Gm/Il interface.
  • the related information of the meaning includes the one of the universal resource identifier, the identifier associated with each participant in the sense, or any combination of the identity information, for example, when the related information of the conference includes the conference general resource.
  • the TI value associated with each participant in the conference is optional.
  • the session transfer method, apparatus, and system provided by the embodiments of the present invention can be applied to the wireless communication network.

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Description

会话转移方法、 装置和系统 本申请要求于 2009 年 5 月 5 日提交中国专利局、 申请号为 200910139151.4, 发明名称为"会话转移方法、 装置和系统"的中国专利申请 的优先权， 其全部内容通过引用结合在本申请中。
技术领域
本发明涉及通信领域， 尤其涉及一种会话转移方法、 装置和系统。
背景技术
用户设备 ( User Equipment, UE )可以通过电路交换（ Circuit Switched, CS )域或者分组交换（ Packet Switched, PS )域与通信对端进行^舌： 当 UE 通过 CS域进行会话时， 网络侧的业务集中和会话连续性应用服务器（ Server Centralization and Continuity Application Server, SCC AS )为所述^舌建立基 于 CS域的接入分支（ access leg )， 所述会话在所述基于 CS域的 access leg 控制下通过 CS域进行； 同理， 当 UE通过 PS域进行会话时， SCC AS为所 述会话建立基于 PS域的 access leg, 所述会话在所述基于 PS域的 access leg 控制下通过 PS域进行。 当 UE发生转移时， 如从 PS域控制的区域转移到 CS域控制的区域， 或 从 CS域控制的区域转移到 PS域控制的区域， UE的会话也需要进行转移。 在现有技术中， UE会向 SCC AS发送会话转移请求， SCC AS根据所述会话 转移请求为需要转移的^舌建立基于目标网络的 access leg,并释放源网络的 access leg， 所述^舌在基于目标网络的 access leg控制下通过目标网络进行。 在实现本发明的过程中， 发明人发现， 现有技术至少存在如下问题： 如 果发生转移的 UE中包含至少一个属于会议的会话， 且所述 UE为所述会议 的发起者， 通过现有技术提供的方法对 UE的会话进行转移以后， 可能造成 无法对所述^ i义进行控制的问题。
发明内容
本发明的实施例提供一种会话转移方法、 装置和系统， 能够在会话转移 以后， 对会话所属的会议进行控制。 为达到上述目的， 本发明的实施例采用如下技术方案： 一种^舌转移方法， 包括： 用户设备的^舌从源网络转移到目标网络的 过程中， 确定所述用户设备是否包括至少一个属于会议的会话； 如果所述用 户设备包括至少一个属于会议的会话， 向所述用户设备或者移动交换中心服 务器发送所述会议的相关信息。 一种会话转移方法， 包括： 用户设备的会话从分组交换域转移到电路交 换域的过程中， 在所述用户设备包括至少一个属于会议的会话的情况下， 获 取业务集中和会话连续性应用服务器发送的所述会议的相关信息， 所述会议 的相关信息用于对所述会议进行控制； 根据所述会议的相关信息， 为所述属 于会议的会话建立会议状态。 一种会话转移方法， 包括： 用户设备的会话从电路交换域转移到分组交 换域的过程中， 在所述用户设备包括至少一个属于会议的会话的情况下， 获 取业务集中和会话连续性应用服务器发送的所述会议的会议通用资源标识， 所述会议通用资源标识用于用户设备对所述会议进行控制。
一种会话转移方法， 包括： 用户设备的会话从分组交换域转移到电路交 换域的过程中， 向移动交换中心服务器发送电路交换域的转移请求， 以使得 网络侧将所述用户设备的会话转移到电路交换域， 并且在所述用户设备包括 至少一个属于会议的会话的情况下， 将所述会议的相关信息发送给移动交换 中心服务器； 向所述移动交换中心服务器发送电路交换域信令， 以使得所述 移动交换中心服务器根据所述会议的相关信息对所述会议进行控制。
一种业务集中和会话连续性应用服务器， 包括：
确定单元， 用于用户设备的^舌从源网络转移到目标网络的过程中， 确 定所述用户设备是否包括至少一个属于会议的会话；
发送单元， 用于如果所述确定单元确定所述用户设备包括至少一个属于 会议的会话， 向所述用户设备或者移动交换中心服务器发送所述会议的相关 信息。
一种移动交换中心服务器， 包括：
获取单元， 用于用户设备的会话从分组交换域转移到电路交换域的过程 中， 在所述用户设备包括至少一个属于会议的会话的情况下， 获取业务集中 和会话连续性应用服务器发送的所述会议的相关信息， 所述会议的相关信息 用于对所述会议进行控制；
建立单元， 用于根据从所述获取单元获取的会议的相关信息， 为所述属 于会议的会话建立会议状态。
一种用户设备， 包括：
获取单元， 用于用户设备的会话从电路交换域转移到分组交换域的过程 中， 在所述用户设备包括至少一个属于会议的会话的情况下， 获取业务集中 和会话连续性应用服务器发送的所述会议的会议通用资源标识， 所述会议通 用资源标识用于对所述会议进行控制。
一种用户设备， 包括：
第一发送单元， 用于用户设备的会话从分组交换域转移到电路交换域的 过程中， 向移动交换中心服务器发送电路交换域的转移请求， 以使得网络侧 将所述用户设备的会话转移到电路交换域， 并且在所述用户设备包括至少一 个属于会议的会话的情况下， 将所述会议的相关信息发送给移动交换中心服 务器；
第二发送单元， 用于向所述移动交换中心服务器发送电路交换域信令， 以使得所述移动交换中心服务器根据所述会议的相关信息对所述会议进行控 制。
一种通信系统， 包括： 业务集中和会话连续性应用服务器和移动交换中 心服务器； 所述业务集中和会话连续性应用服务器， 用于用户设备的会话从分组交 换域转移到电路交换域的过程中， 如果所述用户设备包括至少一个属于会议 的会话， 向所述移动交换中心服务器发送所述会议的相关信息；
所述移动交换中心服务器， 用于从所述业务集中和会话连续性应用服务 器获取所述会议的相关信息， 根据所述会议的相关信息， 为所述属于会议的 会话建立会议状态， 其中， 所述会议的相关信息用于对所述会议进行控制。
一种通信系统， 包括： 业务集中和会话连续性应用服务器和用户设备； 所述业务集中和会话连续性应用服务器， 用于所述用户设备的会话从电 路交换域转移到分组交换域的过程中， 如果所述用户设备包括至少一个属于 会议的会话， 向所述用户设备发送所述会议的会议通用资源标识；
所述用户设备， 用于从所述业务集中和会话连续性应用服务器获取所述 会议通用资源标识，其中，所述会议通用资源标识用于对所述会议进行控制。
本发明实施例提供的会话转移方法、 装置和系统， 能够在会话转移的过 程中， 将^舌所属的 义的相关信息发送给用户设备或者移动交换中心服务 器， 所述用户设备或者移动交换中心服务器能够获取所述会议的相关信息， 并且在会话转移以后， 根据所述会议相关信息对会话所属的会议进行控制， 解决了现有技术中， 会话转移以后， 无法在目标网络中对会话所属的会议进 行控制的问题。
附图说明 为了更清楚地说明本发明实施例或现有技术中的技术方案， 下面将对实 施例或现有技术描述中所需要使用的附图作简单地介绍， 显而易见地， 下面 描述中的附图仅仅是本发明的一些实施例， 对于本领域普通技术人员来讲， 在不付出创造性劳动性的前提下， 还可以根据这些附图获得其他的附图。
图 1为本发明实施例提供的会话转移方法流程图；
图 2为本发明另一实施例提供的^舌转移方法流程图；
图 3为本发明施例 1提供的会话转移方法时序图；
图 4为本发明施例 2提供的会话转移方法时序图；
图 5为本发明施例 3提供的会话转移方法时序图；
图 6为本发明施例 4提供的会话转移方法时序图；
图 7为本发明实施例提供的业务集中和会话连续性应用服务器的结构示 意图一；
图 8为图 7所示的本发明实施例提供的业务集中和会话连续性应用服务 器中发送单元 702的结构示意图；
图 9为本发明实施例提供的业务集中和会话连续性应用服务器的结构示 意图二；
图 10为本发明实施例提供的移动交换中心服务器结构示意图； 图 11为本发明实施例提供的用户设备结构示意图；
图 12为本发明另一实施例提供的用户设备结构示意图； 图 13为本发明实施例提供的通信系统结构示意图一； 图 14为本发明实施例提供的通信系统结构示意图二。
具体实施方式
下面将结合本发明实施例中的附图， 对本发明实施例中的技术方案进行 清楚、 完整地描述， 显然， 所描述的实施例仅仅是本发明一部分实施例， 而 不是全部的实施例。 基于本发明中的实施例， 本领域普通技术人员在没有作 出创造性劳动前提下所获得的所有其他实施例， 都属于本发明保护的范围。 为了解决会话转移以后， 可能无法对会话所属的会议进行控制的问题， 本发明实施例提供一种^舌转移方法、 装置和系统。 如图 1所示， 本发明实施例提供的会话转移方法， 包括： 步骤 101， UE的会话从源网络转移到目标网络的过程中， 确定所述 UE 是否包括至少一个属于会议的会话； 源目标网络和目标网络的关系可以如下： 源目标网络是第一网络中的 PS域 /CS域， 目标网络是该第一网络中的 CS域/ PS域； 或者 源目标网络是第一网络中的 PS域 /CS域， 目标网络是第二网络中的 CS 域/ PS域。 步骤 102，如果所述 UE包括至少一个属于会议的会话， 向所述 UE或者 移动交换中心服务器（MSC Server )发送所述会议的相关信息。 在本实施例中， 如果 UE的会话从 PS域转移到 CS域， 则所述步骤 102 者关联的事务标识（Transaction identifier, TI )值和身份标识信息， 其中 ΤΙ 用于标识不同会话； 如果 UE的会话从 CS域转移到 PS域， 则所述步骤 102 向 UE发送会议通用资源标识。
当 UE的会话从 CS域移动到 PS域时， 为了保证后续 UE的会话从 PS 域移动回 CS域的过程中， 步骤 102能够向 MSC Server发送会议中各参与者 关联的 Ή值和身份标识信息，本发明实施例提供的会话转移方法，还可以包 括： 获取并保存所述会议中各参与者关联的 TI值和身份标识信息。
本发明实施例提供的会话转移方法， UE 的会话进行转移的过程中， 如 果所述 UE包括至少一个属于会议的会话， 则将所述会议的相关信息发送给 UE或者 MSC Server, 使得所述 UE或者 MSC Server能够在会话转移以后， 根据所述会议的相关信息， 对所述会议进行控制， 解决了现有技术中会话转 移以后， 可能无法对会话所属的会议进行控制的问题。
如图 2所示， 本发明另一实施例还提供一种会话转移方法， 包括： 步骤 201， UE的会话从 PS域转移到 CS域的过程中，如果所述 UE包括 至少一个属于会议的会话， 获取 SCC AS发送的所述会议的相关信息， 所述 会议的相关信息用于对所述会议进行控制；
在本实施例中， 所述会议的相关信息包括： 会议通用资源标识、 会议中 各参与者关联的 Ή值和身份标识信息等；
步骤 202， 根据所述会议的相关信息， 为所述属于会议的会话建立会议 状态。
本发明实施例提供的会议转移方法， 如果 UE包括至少一个属于会议的 会话， 能够从 SCC AS获取所述会议的相关信息， 并为所述属于会议的会话 建立会议状态， 进而在会话转移以后， 能够根据所述会议的相关信息， 对所 述会议进行控制， 解决了现有技术中会话转移以后， 可能无法对会话所属的 义进行控制的问题。
本发明又一实施例还提供一种会议转移方法， 包括： UE的会话从 CS域 转移到 PS域的过程中， 如果所述 UE包括至少一个属于会议的会话， 获取 SCC AS发送的所述会议的会议通用资源标识， 所述会议通用资源标识用于 对所述会议进行控制。
为了保证后续 UE的会话从 PS域移动回 CS域时， MSC Server能够从 SCC AS获取会议中各参与者关联的 Ή值和身份标识信息， 本发明实施例提 供的会话转移方法， 还可以包括： 将预先存储的所述会议中各参与者的 TI 值和标识信息发送给所述 SCC AS。
本发明实施例提供的会话转移方法， 如果 UE包括至少一个属于会议的 会话， 能够从 SCC AS获取所述会议的会议通用资源标识， 进而在会话转移 以后， 能够根据所述会议通用资源标识， 对所述会议进行控制， 解决了现有 技术中会话转移以后， 可能无法对^舌所属的^ i义进行控制的问题。
本发明再一个实施例还提供一种会话转移方法， 包括： UE的会话从 PS 域转移到 CS域的过程中， 向 MSC Server发送 CS域的转移请求， 以使得网 络侧将所述 UE的会话转移到 CS域，并且在所述 UE包括至少一个属于会议 的会话的情况下， 将所述会议的相关信息发送给 MSC Server; 向所述 MSC Server发送电路交换域信令，以使得所述 MSC Server根据所述会议的相关信 息对所述会议进行控制。
本发明实施例提供的会话转移方法， 能够向 MSC Server发送 CS域会话 转移请求，使得网络侧将所述 UE的会话转移到 CS域， 并且在所述 UE包括 至少一个属于会议的会话的情况下， 将所述会议的相关信息发送给 MSC Server, UE发送 CS域控制信令， 使得 MSC Server对所述会议进行控制， 解 决了现有技术中^舌转移以后，可能无法对^舌所属的^ i义进行控制的问题。
为了使本领域技术人员能够更清楚地理解本发明实施例提供的技术方 案， 下面通过具体的实施例， 对本发明实施例提供的信息发送和获取的方法 进行伴细说明。
实施例 1 : UE只有一个会话， 该会话属于会议， UE为会议的发起者， UE从 PS域控制的区域移动到 CS域控制的区域， 会议中心保持在 PS域； 其中， PS域具体为基于 PS的 IP多媒体子系统（ IP Multimedia Subsystem, IMS )域， UE为不支持 Gm或 II接口的 UE ( non lCS UE ), CS域中的 MSC Server具有 IMS集中业务（ IMS Centralized Service， ICS )增强功能。
如图 3所示， 本发明实施例提供的会话转移方法， 包括：
步骤 301， UE向 MSC Server发送会话转移请求， 所述会话转移请求中 携带会话转移号码（ Session Transfer Number, STN )。
在本实施例中， 所述会话转移请求可以为 24.008 set up消息。
步骤 302， MSC Server根据 UE发送的会话转移请求生成 Invite请求， 该 Invite 请求携带 STN 和 UE 的身份标识， 向服务会话功能控制实体 ( Server-Call Session Control Function, S-CSCF )发送所述 Invite请求。
在本实施例中， MSC Server具有 ICS增强功能，可以代替 UE在 IMS域 中注册， 当 MSC Server预先代替 UE在 IMS域中注册时， 所述 UE的身份标 识为实例身份（ Instance ID )。
步骤 303， S-CSCF将 MSC Server发送的 Invite请求转发给 SCC AS。 步骤 304， SCC AS根据 S-CSCF发送的 Invite请求携带的 STN确定该
Invite请求为转移请求， 根据所述 Invite请求携带的 UE的身份标识， 为 UE 的会话执行会话转移， 包括： 完成基于 CS域的 access leg的建立， 使用所述 基于 CS域的 access leg的连接信息更新远程分支（ remote leg )， 所述远程分 支为 SCC AS与所述 UE的通信对端之间的 access leg。
步骤 305， SCC AS确定 UE只有一个会话，且该会话属于会议，向 S-CSCF 发送 Invite回复， 在该 Invite回复中携带会议的相关信息。 在本实施例中， SCC AS预先存储了 UE会话的相关信息， 如 UE包括的 会话个数、 各会话状态信息（激活 /保持） 以及会话所属会议的相关信息等。 SCC AS可以根据 Invite请求中携带的 UE身份标识， 查找属于所述 UE的会 话的相关信息， 根据所述会话的相关信息确定 UE的会话是否包括属于会议 的^舌。
在本实施例中， 所述会议的相关信息可以包括： 会议通用资源标识、 所 述会议中各参与者关联的 TI值和身份标识信息等； SCC AS可以将所述会议 的相关信息携带在 Invite回复的会话状态信息（ Session State Information )中。
步骤 306， S-CSCF将 SCC AS发送的 Invite回复转发给 MSC Server。 步骤 307， MSC Server从所述 Invite回复中获取会议的相关信息， 为属 于会议的会话建立会议状态， 增加会议状态信息， 如会话属于一个会议（call in MPTY ), 其中， 所述会议的相关信息用于对所述会议进行控制。
步骤 308， 当所述 UE的会话转移成功以后， SCC AS将原先为 UE的会 话建立的基于 PS域的 access leg释放， 完成从 PS域到 CS域的会话转移。
在实际的使用过程中， 当 UE在 single radio的情况时， 会话转移的流程 与如图 3所示的步骤基本相同， 区别点在于： 由 MSC Server发起会话的转移 请求。
在 CS域中， UE和 MSC Server之间可以通过 24.008消息或者 facility消 息传递信息； MSC Server收到所述 24.008消息或者 facility消息之后， 可以 根据步骤 307中获取的会议的相关信息， 对 UE发起的会议进行控制， 如将 义保持、 将会议恢复、 邀请用户加入会议、 终止会议中的一方或释放会议 等。
实施例 2: UE有一个激活状态的会话和一个保持状态的会话， 激活状态 的会话为普通会话， 保持状态的会话属于会议， UE为会议的发起者， UE从 PS域控制的区域移动到 CS域控制的区域， 会议中心保持在 PS域； 其中， PS域具体为基于 PS的 IMS域， UE为不支持 Gm或 II接口的 UE ( non ICS UE )， CS域中的 MSC Server具有 ICS增强功能。
如图 4所示， 本发明实施例提供的会话转移方法， 包括：
步骤 401-403与如图 3所示的步骤 301-303相同， 此处不再赘述。
步骤 404， SCC AS根据所述 S-CSCF发送的 Invite请求携带的 STN确定 该 Invite请求为转移请求， 根据所述 Invite请求携带的 UE的身份标识， 为 UE 中激活状态的会话执行会话转移， 会话转移的具体步骤可以参见如图 3 所示的步骤 304所述， 此处不再赘述。
SCC AS上可以预先设置会话转移策略， 如在本实施例中， 会话转移策 略为先转移激活状态的会话， 然后转移保持状态的会话， 则在步骤 404中， 如果 SCC AS查找到 UE有多个会话， SCC AS可以根据所述会话转移策略， 将激活状态的会话进行转移。
步骤 405， SCC AS确定 UE包括属于会议的会话，向 S-CSCF发送 Invite 回复， 在该 Invite回复中携带会议的相关信息。
在本实施例中， 所述会议的相关信息携带在 Invite回复的会话状态信息 ( Session State Information ) 中； SCC AS确定 UE包括属于^ i义的会话的方 法可以参见如图 3所示的步骤 305所述， 此处不再赘述。
步骤 406和 407与如图 3所示的步骤 306和 307相同， 此处不做赞述。 步骤 408， MSC Server根据所述 Invite回复的会话状态信息， 向 SCC AS 发起保持状态会话的转移。
在本实施例中， 所述保持状态的会话属于会议， 所述步骤 408 中 MSC Server还为所述保持状态的会话建立会议状态， 增加会议状态信息（call in MPTY )。
步骤 409， 当所述 UE的会话 (包括激活状态会话和保持状态会话 )转 移成功以后， SCC AS将原先为 UE的会话 (包括激活状态会话和保持状态会 话 )建立的基于 PS域的 access leg释放， 完成从 PS域到 CS域的会话转移。
在实际的使用过程中， 当 UE在 single radio的情况时， 会话转移的流程 与如图 4所示的步骤基本相同， 区别点在于： 由 MSC Server发起会话的转移 请求。
在 CS域中， UE和 MSC Server之间可以通过 24.008消息或者 facility消 息传递信息； MSC Server可以根据步骤 407 中获取的会议的相关信息， 对 UE发起的会议进行控制， 如将会议保持、 将会议恢复、 邀请用户加入会议、 终止会议中的一方或释放会议等； UE可以通过 hold消息将激活状态的会话 转换为保持状态， 通过 facility消息将保持状态的会话转换为激活状态等。
实施例 3: UE只有一个会话， 该会话属于会汉， UE为会议的发起者， UE从 CS域控制的区域移动到 PS域控制的区域， 义中心保持在 CS域； 其中， PS域具体为基于 PS的 IMS域， UE为不支持 Gm或 II接口的 UE( non ICS UE )， CS域中的 MSC Server具有 ICS增强功能。
如图 5所示， 本发明实施例提供的会话转移方法， 包括：
步骤 501， UE 向 S-CSCF 发送 Invite 请求， 所述 Invite 请求中的 Request-URI设置为 UE的静态 STI值， 其中， 所述静态 STI值预先配置在 UE中， 用于向 SCC AS指示会话转移。
步骤 502， S-CSCF将 UE发送的 Invite请求转发给 SCC AS。
步骤 503， SCC AS根据所述 S-CSCF发送的 Invite请求携带的 STI值确 定该 Invite请求为转移请求，根据所述 Invite请求携带的 UE的身份标识，为 UE的会话执行会话转移， 包括： 完成基于 PS域的 access leg的建立， 使用 所述基于 PS域的 access leg的连接信息更新远程分支（ remote leg )， 所述远 程分支为 SCC AS与所述 UE的通信对端之间的 access leg。
步骤 504， SCC AS确定 UE只有一个会话，且该会话属于会议，向 S-CSCF 发送 Invite回复， 在该 Invite回复中携带会议的相关信息。
在本实施例中， SCC AS预先存储了 UE会话的相关信息， 如 UE包括的 会话个数、 各会话状态信息（激活 /保持） 以及会话所属会议的相关信息等。
SCC AS可以根据 UE的身份标识， 查找属于所述 UE的会话的相关信息， 根 据所述会话的相关信息确定 UE的会话是否包括属于会议的会话。
在本实施例中， 所述会议的相关信息可以包括： 会议 URI信息等； SCC AS可以将所述会议的相关信息携带在 Invite 回复的会话状态信息 （Session State Information ) 中。
步骤 505， S-CSCF将 SCC AS发送的 Invite回复转发给 UE。
步骤 506， UE从所述 Invite回复中获取并保存会议的相关信息， 其中， 所述会议的相关信息用于对所述会议进行控制。
步骤 507， 当所述 UE的会话转移成功以后， SCC AS将原先为 UE的会 话建立的基于 CS域的 access leg释放， 完成从 CS域到 PS域的会话转移。
在 PS域中， UE可以根据所述步骤 506获取的会议相关信息通过 PS信 令对会议进行控制， 如将会议保持、 将会议恢复、 邀请用户加入会议、 终止 ^i 中的一方或释放会议等。
在 CS域中，会议中各参与者的 TI值和标识信息保存在 UE和 MSC Server 上， 当 UE从 CS域控制的区域转移到 PS域控制的区域时， SCC AS上没有 会议中各参与者的 TI值和标识信息， 为了保证 UE从 PS域控制的区域转移 到 CS域控制的区域时， SCC AS能够向 MSC Server发送所述会议中各参与 者的 TI值和标识信息， UE还需要向 SCC AS发送会议中各参与者的 TI值和 标识信息，具体地， 所述会议中各参与者的 Ή值和标识信息可以携带在步骤
501和 502的 Invite请求的 SDP中。
实施例 4: UE有一个激活状态的会话和一个保持状态的会话， 激活状态 的会话为普通会话， 保持状态的会话属于会议， UE为会议的发起者， UE从
CS域控制的区域移动到 PS域控制的区域， 会议中心保持在 PS域； 其中，
PS域具体为基于 PS的 IMS域， UE为不支持 Gm或 II接口的 UE ( non ICS
UE )， CS域中的 MSC Server具有 ICS增强功能。
如图 6所示， 本发明实施例提供的会话转移方法， 包括：
步骤 601和 602与如图 5所示的步骤 501和 502相同， 此处不再赞述。 步骤 603， SCC AS根据 S-CSCF发送的 Invite请求携带的 STI值确定该
Invite请求为转移请求， 根据所述 Invite请求携带的 UE的身份标识， 为 UE 激活状态的会话执行会话转移， 具体的转移方法可以参见如图 5所示的步骤
503所述， 此处不再赘述。
SCC AS上可以预先设置会话转移策略， 如在本实施例中， 会话转移策 略为先转移激活状态的会话， 然后转移保持状态的会话， 则在步骤 603中， 如果 SCC AS查找到 UE有多个会话， SCC AS可以根据所述会话转移策略， 将激活状态的会话进行转移。
步骤 604， SCC AS确定 UE包括属于会议的会话，向 S-CSCF发送 Invite 回复， 在该 Invite回复中携带会议的相关信息。 在本实施例中， 所述会议的相关信息携带在 Invite回复的会话状态信息 ( Session State Information ) 中； SCC AS确定 UE包括属于^ i义的会话的方 法可以参见如图 5所示的步骤 504所述， 此处不再赘述。
步骤 605和 606与如图 5所示的步骤 505和 506相同， 此处不再赘述。 步骤 607， UE根据所述 Invite回复的会话状态信息， 向 SCC AS发起保 持状态会话的转移。
步骤 608， 当所述 UE的会话 (包括激活状态会话和保持状态会话）转 移成功以后， SCC AS将原先为 UE的会话 (包括激活状态会话和保持状态会 话 )建立的基于 CS域的 access leg释放， 完成从 CS域到 PS域的会话转移。
在 PS域中， UE根据所述步骤 606获取的会议相关信息， 通过 PS信令 对会议进行控制， 如将会议保持、 将会议恢复、 邀请用户加入会议、 终止会 议中的一方或释放会议等； 也可以通过 PS信令将激活状态的会话转换为保 持状态， 将保持状态的会话转换为激活状态等。
UE可以向 SCC AS发送会议中各参与者关联的 TI值和身份标识信息， 具体地， 所述会议中各参与者关联的 TI值和身份标识信息可以携带在步骤 601和 602的 Invite请求的 SDP中。
本发明实施例提供的会话转移方法， 能够将会话所属的会议的相关信息 发送给 UE或者 MSC Server,所述 UE或者 MSC Server能够获取所述会议的 相关信息， 并且在会话转移以后， 根据所述会议相关信息对会话所属的会议 进行控制， 解决了现有技术中， 会话转移以后， 无法在目标网络中对会话所 属的^ i义进行控制的问题。
如图 7所示， 本发明实施例还提供一种业务集中和会话连续性应用服务 器， 包括：
确定单元 701，用于用户设备的 ^舌从源网络转移到目标网络的过程中， 确定所述用户设备是否包括至少一个属于会议的会话；
发送单元 702， 用于如果所述确定单元 701确定所述用户设备包括至少 一个属于会议的会话， 向所述用户设备或者移动交换中心服务器发送所述会 议的相关信息。
进一步地， 如图 8所示， 所述发送单元 702可以包括：
第一发送子单元 7021， 用于如果所述源网络为分组交换域， 目标网络为 电路交换域， 向移动交换中心服务器发送会议通用资源标识、 所述会议中各 参与者关联的 Ή值和身份标识信息；
第二发送子单元 7022， 用于如果所述源网络为电路交换域， 目标网络为 分组交换域， 向所述用户设备发送会议通用资源标。
进一步地， 如图 9所示， 所述业务集中和会话连续性应用服务器， 还可 以包括：
获取单元 703， 用于如果所述源网络为电路交换域， 目标网络为分组交 换域， 获取并保存所述会议中各参与者的 TI值和标识信息。 本发明实施例提供的业务集中和会话连续性应用服务器的具体实现方 法，可以参见本发明实施例提供的信息发送和获取方法所述，此处不再赘述。
本发明实施例提供的业务集中和会话连续性应用服务器， 用户设备的会 话转移的过程中， 如果所述会话包括至少一个属于会议的会话， 则将所述会 议的相关信息发送给用户设备或者移动交换中心服务器， 使得所述用户设备 或者移动交换中心服务器能够在会话转移以后， 根据所述会议的相关信息， 对所述会议进行控制， 解决了现有技术中会话转移以后， 可能无法对会话所 属的^ i义进行控制的问题。
如图 10所示， 本发明实施例还提供一种移动交换中心服务器， 包括： 获取单元 1001，用于用户设备的会话从分组交换域转移到电路交换域的 过程中， 如果所述用户设备包括至少一个属于会议的会话， 获取业务集中和 会话连续性应用服务器发送的所述会议的相关信息， 所述会议的相关信息用 于对所述会议进行控制；
建立单元 1002，用于根据从所述获取单元 1001获取的会议的相关信息， 为所述属于会议的会话建立会议状态。
本发明实施例提供的移动交换中心服务器的具体实现方法， 可以参见本 发明实施例提供的信息发送和获取方法所述， 此处不再赘述。
本发明实施例提供的移动交换中心服务器， 如果所述用户设备包括至少 一个属于会议的会话， 能够从业务集中和会话连续性应用服务器获取所述会 议的相关信息， 并为所述属于会议的会话建立会议状态， 进而在会话转移以 后， 能够根据所述会议的相关信息， 对所述会议进行控制， 解决了现有技术 中会话转移以后， 可能无法对会话所属的会议进行控制的问题。
如图 11所示， 本发明实施例还提供一种用户设备， 包括：
获取单元 1101，用于用户设备的会话从电路交换域转移到分组交换域的 过程中， 如果所述用户设备包括至少一个属于会议的会话， 获取业务集中和 会话连续性应用服务器发送的所述会议的会议通用资源标识， 所述会议通用 资源标识用于对所述会议进行控制。
如图 11所示， 所述用户设备， 还可以包括：
发送单元 1102， 用于将预先存储的所述会议中各参与者的 Ή值和标识 信息发送给所述业务集中和会话连续性应用服务器。
本发明实施例提供的用户设备的具体实现方法， 可以参见本发明实施例 提供的信息发送和获取方法所述， 此处不再赘述。
本发明实施例提供的用户设备， 如果包括至少一个属于会议的会话， 能 够从业务集中和会话连续性应用服务器获取所述会议的相关信息， 进而在会 话转移以后， 能够根据所述会议的相关信息， 对所述会议进行控制， 解决了 现有技术中^舌转移以后， 可能无法对^舌所属的^ i义进行控制的问题。
如图 12所示， 本发明另一实施例还提供一种用户设备， 包括： 第一发送单元 1201，用于用户设备的会话从分组交换域转移到电路交换 域的过程中， 向移动交换中心服务器发送电路交换域的转移请求， 以使得网 络侧将所述用户设备的会话转移到电路交换域， 并且在所述用户设备包括至 少一个属于会议的会话的情况下， 将所述会议的相关信息发送给移动交换中 心服务器；
第二发送单元 1202，用于向所述移动交换中心服务器发送电路交换域信 令， 以使得所述移动交换中心服务器根据所述会议的相关信息对所述会议进 行控制。
本发明实施例提供的用户设备， 能够向网络侧发送 CS域会话转移请求， 使得网络侧将所述用户设备的会话转移到电路交换域， 并且在所述用户设备 包括至少一个属于会议的会话的情况下， 将所述会议的相关信息发送给移动 交换中心服务器， 用户设备发送 CS域控制信令， 使得移动交换中心服务器 对所述会议进行控制， 解决了现有技术中会话转移以后， 可能无法对会话所 属的^ i义进行控制的问题。
如图 13所示， 本发明实施例还提供一种通信系统， 包括： 业务集中和会 话连续性应用服务器 1301和移动交换中心服务器 1302;
所述业务集中和会话连续性应用服务器 1301，用于在将用户设备的会话 从分组交换域转移到电路交换域的过程中， 如果所述用户设备包括至少一个 属于会议的会话， 向所述移动交换中心服务器 1302发送所述会议的相关信 所述移动交换中心服务器 1302，用于从所述业务集中和会话连续性应用 服务器 1301获取所述会议的相关信息，根据所述会议的相关信息，为所述属 于会议的会话建立会议状态， 其中， 所述会议的相关信息用于对所述会议进 行控制。
本发明实施例提供的通信系统， 业务集中和会话连续性应用服务器能够 在会话转移的过程中， 将会话所属的会议的相关信息发送给移动交换中心服 务器， 所述移动交换中心服务器能够获取所述会议的相关信息， 为所述属于 会议的会话建立会议状态， 进而在会话转移以后， 能够根据所述会议相关信 息和会议状态信息对会话所属的会议进行控制， 解决了现有技术中， 会话转 移以后， 无法在目标网络中对会话所属的会议进行控制的问题。
如图 14所示， 本发明实施例还提供一种通信系统， 包括： 业务集中和会 话连续性应用月良务器 1401和用户设备 1402;
所述业务集中和会话连续性应用服务器 1401， 用于在将所述用户设备 1402的会话从电路交换域转移到分组交换域的过程中，如果所述用户设备包 括至少一个属于会议的会话，向所述用户设备 1402发送所述会议的会议通用 资源标识；
所述用户设备 1402，用于从所述业务集中和会话连续性应用服务器 1401 获取所述会议的会议通用资源标识， 其中， 所述会议通用资源标识用于对所 述^ i义进行控制。 本发明实施例提供的通信系统， 业务集中和会话连续性应用服务器能够 在会话转移的过程中， 将会话所属的会议的相关信息发送给用户设备， 所述 用户设备能够获取并保存所述会议的相关信息， 进而在会话转移以后， 根据 所述会议相关信息对会话所属的会议进行控制， 解决了现有技术中， 会话转 移以后， 无法在目标网络中对会话所属的会议进行控制的问题。
需要说明的是： 本发明实施例中所涉及的 UE包括但不限于不支持 Gm 或 II接口的 UE ( non ICS UE )或 Gm/Il接口不可用的 ICS UE; 一般的， 本 发明实施例中所涉及的^ i义的相关信息包括^ i义通用资源标识、 义中各参 与者关联的 Ή值或身份标识信息中的一种或其任意组合，例如， 当会议的相 关信息包括会议通用资源标识和身份标识信息时， 则会议中各参与者关联的 TI值为可选项； 本发明实施例提供的会话转移方法、 装置和系统， 可以应用 在无线通信网络中。
本领域普通技术人员可以理解实现上述实施例方法中的全部或部分步骤 是可以通过程序来指令相关的硬件完成， 所述的程序可以存储于一计算机可 读存储介质中， 如 ROM/RAM、 磁碟或光盘等。
以上所述， 仅为本发明的具体实施方式， 但本发明的保护范围并不局限 于此， 任何熟悉本技术领域的技术人员在本发明揭露的技术范围内， 可轻易 想到变化或替换， 都应涵盖在本发明的保护范围之内。 因此， 本发明的保护 范围应所述以权利要求的保护范围为准。

Claims

权 利 要 求
1、 一种会话转移方法， 其特征在于， 包括：
用户设备的^舌从源网络转移到目标网络的过程中， 确定所述用户设备 是否包括至少一个属于会议的会话；
如果所述用户设备包括至少一个属于会议的会话， 向所述用户设备或者 移动交换中心服务器发送所述会议的相关信息。
2、根据权利要求 1所述的方法， 其特征在于， 所述向所述用户设备或者 移动交换中心服务器发送所述会议的相关信息包括：
在所述源网络为分组交换域， 目标网络为电路交换域时， 向移动交换中 心服务器发送会议通用资源标识、所述会议中各参与者关联的 TI值和身份标 识信息； 和 /或，
在所述源网络为电路交换域， 目标网络为分组交换域时， 向所述用户设 备发送会议通用资源标识。
3、根据权利要求 1所述的方法， 其特征在于， 在所述源网络为电路交换 域， 目标网络为分组交换域时， 所述方法还包括：
获取并保存所述会议中各参与者关联的 TI值和身份标识信息。
4、 一种会话转移方法， 其特征在于， 包括：
用户设备的会话从分组交换域转移到电路交换域的过程中， 在所述用户 设备包括至少一个属于会议的会话的情况下， 获取业务集中和会话连续性应 用服务器发送的所述会议的相关信息， 所述会议的相关信息用于对所述会议 进行控制；
根据所述会议的相关信息， 为所述属于会议的会话建立会议状态。
5、根据权利要求 4所述的方法，其特征在于，所述会议的相关信息包括： 会议通用资源标识、 会议中各参与者关联的 Ή值和身份标识信息； 或者， 会议通用资源标识和身份标识信息。
6， 根据权利要求 4所述的方法， 其特征在于， 所述方法还包括：接收属 于会议的会话状态信息， 为该会话在电路交换域建立新的接入分支， 完成会 话转移过程。
7、 一种会话转移方法， 其特征在于， 包括：
用户设备的会话从电路交换域转移到分组交换域的过程中， 在所述用户 设备包括至少一个属于会议的会话的情况下， 获取业务集中和会话连续性应 用服务器发送的所述会议的会议通用资源标识， 所述会议通用资源标识用于 用户设备对所述^ i义进行控制。
8、 根据权利要求 7所述的方法， 其特征在于， 还包括：
将预先存储的所述会议中各参与者的 TI值和标识信息发送给所述业务 集中和会话连续性应用服务器。
9， 根据权利要求 7所述的方法， 其特征在于， 所述方法还包括： 接收属于会议的会话状态信息， 为该会话在分组交换域建立新的接入分 支， 完成会话转移过程。
10、 一种会话转移方法， 其特征在于， 包括：
用户设备的会话从分组交换域转移到电路交换域的过程中， 向移动交换 中心服务器发送电路交换域的转移请求， 以使得网络侧将所述用户设备的会 话转移到电路交换域， 并且在所述用户设备包括至少一个属于会议的会话的 情况下， 将所述会议的相关信息发送给移动交换中心服务器；
向所述移动交换中心服务器发送电路交换域信令， 以使得所述移动交换 中心服务器根据所述会议的相关信息对所述 义进行控制。
11、 一种业务集中和会话连续性应用服务器， 其特征在于， 包括： 确定单元， 用于用户设备的^舌从源网络转移到目标网络的过程中， 确 定所述用户设备是否包括至少一个属于会议的会话；
发送单元， 用于如果所述确定单元确定所述用户设备包括至少一个属于 会议的会话， 向所述用户设备或者移动交换中心服务器发送所述会议的相关 信息。
12、根据权利要求 11所述的业务集中和会话连续性应用服务器，其特征 在于， 所述发送单元包括：
第一发送子单元， 用于在所述源网络为分组交换域， 目标网络为电路交 换域时， 向移动交换中心服务器发送会议通用资源标识、 所述会议中各参与 者关联的 Ή值和身份标识信息； 和 /或 第二发送子单元， 用于在所述源网络为电路交换域， 目标网络为分组交 换域时， 向所述用户设备发送会议通用资源标识。
13、根据权利要求 11所述的业务集中和会话连续性应用服务器，其特征 在于， 还包括：
获取单元， 用于在所述源网络为电路交换域， 目标网络为分组交换域的 情况下， 获取并保存所述会议中各参与者的 Ή值和标识信息。
14、 一种移动交换中心服务器， 其特征在于， 包括：
获取单元， 用于用户设备的会话从分组交换域转移到电路交换域的过程 中， 在所述用户设备包括至少一个属于会议的会话的情况下， 获取业务集中 和会话连续性应用服务器发送的所述会议的相关信息， 所述会议的相关信息 用于对所述会议进行控制；
建立单元， 用于根据从所述获取单元获取的会议的相关信息， 为所述属 于会议的会话建立会议状态。
15、 一种用户设备， 其特征在于， 包括：
获取单元， 用于用户设备的会话从电路交换域转移到分组交换域的过程 中， 在所述用户设备包括至少一个属于会议的会话的情况下， 获取业务集中 和会话连续性应用服务器发送的所述会议的会议通用资源标识， 所述会议通 用资源标识用于对所述会议进行控制。
16、 根据权利要求 15所述的用户设备， 其特征在于， 还包括： 发送单元，用于将预先存储的所述会议中各参与者的 TI值和标识信息发 送给所述业务集中和会话连续性应用服务器。
17、 一种用户设备， 其特征在于， 包括：
第一发送单元， 用于用户设备的会话从分组交换域转移到电路交换域的 过程中， 向移动交换中心服务器发送电路交换域的转移请求， 以使得网络侧 将所述用户设备的会话转移到电路交换域， 并且在所述用户设备包括至少一 个属于会议的会话的情况下， 将所述会议的相关信息发送给移动交换中心服 务器；
第二发送单元， 用于向所述移动交换中心服务器发送电路交换域信令， 以使得所述移动交换中心服务器根据所述会议的相关信息对所述会议进行控 制。
18、 一种通信系统， 其特征在于， 包括： 业务集中和会话连续性应用服 务器和移动交换中心服务器；
所述业务集中和会话连续性应用服务器， 用于用户设备的会话从分组交 换域转移到电路交换域的过程中， 如果所述用户设备包括至少一个属于会议 的会话， 向所述移动交换中心服务器发送所述会议的相关信息；
所述移动交换中心服务器， 用于从所述业务集中和会话连续性应用服务 器获取所述会议的相关信息， 根据所述会议的相关信息， 为所述属于会议的 会话建立会议状态， 其中， 所述会议的相关信息用于对所述会议进行控制。
19、 一种通信系统， 其特征在于， 包括： 业务集中和会话连续性应用服 务器和用户设备；
所述业务集中和会话连续性应用服务器， 用于所述用户设备的会话从电 路交换域转移到分组交换域的过程中， 如果所述用户设备包括至少一个属于 会议的会话， 向所述用户设备发送所述会议的会议通用资源标识；
所述用户设备， 用于从所述业务集中和会话连续性应用服务器获取所述 义通用资源标识，其中，所述会议通用资源标识用于对所述会议进行控制。
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