WO2010121521A1 - 实现业务连续性的方法、系统、msc服务器及会话终端 - Google Patents

实现业务连续性的方法、系统、msc服务器及会话终端 Download PDF

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Publication number
WO2010121521A1
WO2010121521A1 PCT/CN2010/071717 CN2010071717W WO2010121521A1 WO 2010121521 A1 WO2010121521 A1 WO 2010121521A1 CN 2010071717 W CN2010071717 W CN 2010071717W WO 2010121521 A1 WO2010121521 A1 WO 2010121521A1
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Prior art keywords
ims
session
control channel
service control
domain
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PCT/CN2010/071717
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English (en)
French (fr)
Inventor
龙水平
衣强
金辉
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华为终端有限公司
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Publication of WO2010121521A1 publication Critical patent/WO2010121521A1/zh

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/10Architectures or entities
    • H04L65/1016IP multimedia subsystem [IMS]
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/1066Session management
    • H04L65/1083In-session procedures
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/1066Session management
    • H04L65/1083In-session procedures
    • H04L65/1095Inter-network session transfer or sharing
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/0005Control or signalling for completing the hand-off
    • H04W36/0011Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H04W36/0022Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies
    • H04W36/00224Control 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]
    • H04W36/00226Control 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] wherein the core network technologies comprise IP multimedia system [IMS], e.g. single radio voice call continuity [SRVCC]
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W88/00Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/14Backbone network devices

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a method, a system, an MSC (Mobile Switching Center) server, and a tongue terminal for implementing service continuity.
  • MSC Mobile Switching Center
  • IMS IP Multimedia Sub-system
  • CSCF Chip Switching Call Control Function
  • AS Application Server
  • the S-CSCF is responsible for routing call requests to the correct AS when the conditions are met, and the AS performs business logic.
  • CS Chip Switching
  • PS Switching Packet Switching
  • 3GPP proposes the ICS (IMS Centralized Service) function.
  • IMS IMS Centralized Service
  • the ICS breaks the limitation that the IMS service can only be entered through the PS network, and further extends the IMS service bearer network to the traditional CS network.
  • FIG. 1 it is a schematic diagram of an existing ICS architecture, in which SCC (Service Centralization and Continuity) performs ICS service logic, and Gm or II is established between ICS UE (user terminal) and SCC AS.
  • SCC Service Centralization and Continuity
  • Gm or II is established between ICS UE (user terminal) and SCC AS.
  • the interface as the service control channel transmission control signaling, establishes a bearer control channel between the ICS UE and the AS, and completes the transmission control of the media bearer.
  • the bearer control channel can be used for different session multiplexing, and is composed of two parts, namely, the UE.
  • the CS domain carries the control channel with the MSC Server to transmit CS domain signaling, MSC Server
  • the IMS domain with the SCC AS carries the control channel, and transmits the SIP signaling that the MSC Server translates the CS domain signaling.
  • the SCC AS combines the description of the service control signaling and the CS bearer on the Gm or II interface to present a standard IMS session on behalf of the UE.
  • the ICS UE is an IMS UE with enhanced ICS capability, and establishes a bearer control signaling path to establish media through the CS domain.
  • the MSC Server enhances the ICS function. For the identified ICS users, the enhanced MSC Server performs CS signaling and IMS SIP (Session Initiation Protocol) signaling conversion, supporting multimedia calls, for users not identified as ICS users.
  • the MSC Server function does not change.
  • the inventor found that when the IMS session is accessed by the PS based on the above ICS architecture, the CS domain can be used as a channel for carrying media, and the Gm interface is used as a service control channel, when the user is connected by the PS.
  • the media content can still be carried through the CS domain, but the Gm interface fails.
  • the service control channel of the session fails, and the user cannot control the session.
  • the user contains multiple sessions, and one of the sessions is active, one or more sessions are in the hold state, because the service control channel is unavailable, the user cannot resume the session in the hold state, and only the maintained session can be held by the AS. freed.
  • the above manner of releasing the session due to the failure of the control channel makes the user unable to resume the held session, thereby causing the user session to be lost and the experience to be degraded.
  • the present invention provides the following technical solutions:
  • a method of achieving business continuity including:
  • the IMS tongue Associated with at least two IP Multimedia Subsystem IMS sessions belonging to a session terminal, the IMS tongue transmitting traffic control signaling over a Service Control Channel of a packet switched PS access network; passing the circuit when the Traffic Control Channel is unavailable Switched CS bearer control channel transmission station The service control signaling of the IMS session.
  • a system for implementing business continuity comprising: a mobile switching center MSC server, an application server AS,
  • the MSC server is configured to associate with at least two IMS sessions belonging to a session terminal, where the IMS tongue transmits service control signaling through a service control channel of the PS access network, and when the service control channel is unavailable,
  • the CS bearer control channel transmits the service control signaling of the IMS session, where the CS bearer control channel includes a CS domain part between the session terminal and the MSC server, and an IMS domain between the MSC server and the AS section.
  • An MSC server comprising:
  • An association unit configured to associate with at least two IMS sessions belonging to one session terminal, where the IMS tongue transmits service control signaling by using a service control channel of the PS access network;
  • a transmission unit configured to: when the service control channel is unavailable, transmit the service control signaling of the IMS session by using a CS bearer control channel.
  • a session terminal comprising:
  • An association unit configured to associate at least two IMS sessions with an MSC server, where the IMS tongue transmits service control signaling by using a service control channel of the PS access network;
  • the service control signaling interaction unit is configured to perform the interaction of the service control signaling of the IMS session by using the CS bearer control channel when the service control channel is unavailable.
  • the server is associated with at least two IP multimedia subsystem IMS sessions belonging to a session terminal, and the IMS session transmits the service control channel through the packet switched PS access network.
  • Control signaling when the service control channel is unavailable, transmitting the service control signaling of the IMS session through the circuit switched CS bearer control channel.
  • the embodiment of the present invention can restore the control of multiple sessions, and ensure the smooth flow of the session service, when the service control channel is unavailable, and the control signaling cannot be transmitted, thereby causing the session service, especially if the state session service fails. The user experience is not lost, so the user experience is improved.
  • Figure 1 is a schematic diagram of an existing ICS architecture
  • FIG. 2 is a flow chart of a first embodiment of a method for implementing business continuity according to the present invention
  • FIG. 3 is a flow chart of a second embodiment of a method for implementing business continuity according to the present invention.
  • FIG. 4 is a flow chart of a third embodiment of a method for implementing business continuity according to the present invention.
  • FIG. 5 is a flowchart of a fourth embodiment of a method for implementing service continuity according to the present invention.
  • FIG. 6 is a flowchart of a fifth embodiment of a method for implementing service continuity according to the present invention.
  • FIG. 7 is a flowchart of a sixth embodiment of a method for implementing service continuity according to the present invention.
  • FIG. 8 is a block diagram of an embodiment of a session service recovery system according to the present invention.
  • FIG. 9 is a block diagram of an embodiment of an MSC server according to the present invention.
  • FIG. 10 is a block diagram of an embodiment of a session terminal according to the present invention. Mode for carrying out the invention
  • the embodiment of the present invention provides a method, a system, an MSC server, and a session terminal for implementing service continuity.
  • the server is associated with at least two IMS sessions belonging to one session terminal.
  • the IMS session is transmitted through the CS bearer control channel. Service control signaling.
  • FIG. 2 The flow of the first embodiment of the present invention is shown in FIG. 2:
  • Step 201 Associate with at least two IMS sessions belonging to one session terminal.
  • the IMS session transmits the service control signaling through the service control channel of the PS domain network, and transmits the media through the existing CS bearer.
  • Step 202 When the service control channel is unavailable, the service control signaling of the IMS session is transmitted through the CS bearer control channel.
  • the service control channel is unavailable.
  • the session terminal detects that the service control channel is unavailable; or the server detects that the service control channel is unavailable.
  • the service control signaling for transmitting the IMS session by using the CS bearer control channel may include: creating a new CS bearer control channel, and transmitting the service control signaling of the IMS session by using the newly created CS bearer control channel;
  • the existing CS bearer control channel transmits service control signaling of one of the at least two IMS sessions, creates a new CS bearer control channel, and transmits the remaining IMS session except the one IMS session through the new CS bearer control channel.
  • Service control signaling may include: creating a new CS bearer control channel, and transmitting the service control signaling of the IMS session by using the newly created CS bearer control channel;
  • the existing CS bearer control channel transmits service control signaling of one of the at least two IMS sessions, creates a new CS bearer control channel, and transmits the remaining IMS session except the one IMS session through the new CS bearer control channel.
  • Service control signaling may include: creating a new CS bearer control channel, and transmitting
  • the CS bearer control channel includes: a CS domain part between the session terminal and the mobile switching center MSC server, and an IMS domain part between the MSC server and the application server AS, and the service of the IMS session is transmitted through the CS bearer control channel.
  • the control signaling may further include: creating an IMS domain channel between the MSC server and the application server AS, and transmitting the service control signal of the IMS session by using the CS domain part of the existing CS bearer control channel and the newly created IMS domain channel.
  • the service control signaling of one of the at least two IMS sessions is transmitted through the existing CS bearer control channel, and the IMS domain channel between the new MSC server and the application server AS is established, and the existing CS is passed.
  • the CS domain portion carrying the control channel and the newly created IMS domain channel transmit traffic control signaling for the remaining IMS sessions of the one IMS session.
  • the service control signaling for transmitting the IMS session by using the CS bearer control channel may also include: multiplexing the existing CS bearer control channel to transmit the service control signaling of the IMS session.
  • the embodiments of the present invention are further described in detail. It is assumed that the session between UE A and UE B is in an active state, the session between UE A and UE C is in a hold state, and UE A is simultaneously covered from a PS domain and a CS domain. The area is switched to the area covered by only the CS domain, resulting in the service control channel being unavailable, such as the session service recovery process from the UMTS network to the GSM covered network.
  • the flow of the second embodiment of the present invention is as shown in FIG. 3, which shows that when the UE detects that the service control channel is unavailable, the UE associates the existing CS domain bearer control channel with the current active state session, and notifies the AS by initiating a CS call. Transferring the service control channel to the CS domain, and re-establishing the CS bearer for the session in the CS domain, and establishing a new CS bearer control channel, that is, using the first CS domain to carry the control channel (that is, the existing one)
  • the CS domain bearer control channel transmits the service control signaling of the first call, and establishes a second CS domain bearer control channel (that is, the newly established CS bearer control channel) for the second call, in the process:
  • Step 301 UE A detects that the service control channel Gm is unavailable.
  • the initial session between UE A and UE B is active, and the session between UE A and UE C is in a hold state.
  • the SCC AS assigns a TI value to each session when it is established.
  • the first session established first has a threshold of 0 (the maximum available value is currently 7), and the subsequent established session
  • the TI value is incremented by 1.
  • the SCC AS notifies the corresponding UE of the TI value, so the SCC AS maintains a consistent session threshold with each UE. Alternatively, it may be the UE to assign a threshold. If the UE allocates, the UE notifies the corresponding UE of the threshold.
  • an STI value is also allocated for identifying the specified session when the UE requests the SCC AS to transfer the session.
  • Step 302 UE A initiates a hold request for UE B on the first CS domain bearer control channel.
  • UE A sends a hold request to UE B through the first CS domain bearer control channel, requesting to change the active state session between UE A and UE B into a hold state session.
  • Step 303 to step 304 The UEA initiates a new CS call requesting to establish a second CS domain bearer control channel.
  • UE A performs a standard CS domain call procedure, and sends a CS call request to the MSC Server.
  • the MSC server generates an INVITE message, which includes the MGW SDP information and the address information of the UE C.
  • the INVITE message is forwarded to the SCC AS through the S-CSCF.
  • the SCC AS executes the corresponding business logic. After the CS domain call process is completed, a new CS bearer and a new CS domain bearer control channel are established accordingly.
  • the number of the UE C may be carried in the INVITE message, and the AS identifies that a session connection exists between the UE A and the UE C, and associates the newly established bearer with the session connection.
  • the INVITE message carries the STN value of the UE C and the TI value associated with the session, and the STN is a public telephone number, and the TI value is written into the TI requested by the CS domain.
  • the value field, and the TI flag field in the TI value is set to 0.
  • the TI flag is set to 1 when the MSC Server is converted to the CS domain request, and the same), so that the SCC AS identifies the STN and the threshold.
  • a session is a request sent for the associated devaluation of the original session to transfer the traffic control channel, such that the SCC AS associates the newly established CS bearer with the session peer.
  • Step 305 to step 307 The SCC AS detects that a session connection has been established between the UE A and the UE C, and sends a re-INVITE message to the UE C through the S-CSCF, so that the second CS domain carries the control channel and the existing AS. A session connection association with UE C.
  • Step 308 Maintain a session between UE A and UE C through the second CS domain bearer control channel.
  • Step 309 Resume the call state of the session between UE A and UE B by using the first CS domain bearer control channel.
  • the first CS domain bearer control channel is associated with the currently active session (the session between UE A and UE B), and if the current session is in the hold state, the predetermined policy may be used according to the predetermined policy.
  • Associating a specified one of the hold sessions with the first CS domain bearer control channel for example, the policy is to associate the earliest established session with the first CS domain bearer control channel, and the second CS domain bears the control channel and the second time in time Established session association.
  • the flow of the third embodiment of the present invention is as shown in FIG. 4.
  • This embodiment shows that when the SCC AS detects that the control channel Gm is unavailable, a new CS call is initiated by the SCC AS.
  • the first CS domain bearer The control channel (that is, the existing CS domain bearer control channel) transmits the service control signaling of one session, and the newly established second CS domain bearer control channel is associated with another session, and the second CS domain bearer control channel controls the Another session, the process is as follows:
  • Step 401 The SCC AS detects that the service control channel Gm is unavailable.
  • the initial session between UE A and UE B is active, and the session between UE A and UE C is in a hold state.
  • Step 402 to step 404 The SCC AS initiates a call request with the UE A, and the requested SIP header field P-Asserted-Identity includes the address information of the opposite UE C (address information in the form of a tell URI), so that the UEA can decide to
  • the call request is to request to establish a second CS domain bearer control channel between UE C and UE A.
  • the call request is forwarded by the S-CSCF to the MSC Server, and the MSC Server establishes a CS domain call with the UEA.
  • Step 405 After receiving the call request, UE A selects to suspend the call request. This is because the session between UE A and UE B is in an active state, and the user of the suspending operation UE A does not perceive.
  • Step 406 Complete a process of establishing a second CS domain bearer control channel for maintaining a session between UE A and UE C.
  • the bearer control channel of the first CS domain in the foregoing embodiment is associated with the currently active session (the tongue between UE A and UE B), and if the current session is in the hold state, Then, a specified one of the hold sessions may be associated with the first CS domain bearer control channel according to a predetermined policy, such as the policy is to associate the earliest established session with the existing CS domain bearer control channel.
  • the flow of the fourth embodiment of the present invention is as shown in FIG. 5.
  • the embodiment shows that the AS detects that the service control channel Gm is unavailable, and the CS domain part of the first CS domain bearer control channel between the different session multiplexing UE and the MSC Server.
  • Default IMS domain part of the first CS bearer control channel and current A session association in a live state a new IMS domain channel is established between the MSC Server and the SCC AS for the other sessions except the active state, and the SCC AS sends the session information to the MSC Server.
  • the session information includes the TI value of each session, STI.
  • the value, the status information of the session causes the MSC Server to learn the session information and send an INVITE message to the SCC AS for the session other than the active state to establish an IMS domain channel.
  • the threshold may also be optional information.
  • This embodiment shows that the CS domain bearer between the UE and the MSC Server is shared by different sessions, and the control signaling is transmitted on the IMS domain channel between the different MSC Servers and the SCC AS, and the different values can be distinguished according to the TI value of the CS domain call.
  • Session where the shared CS domain bearer is the CS part of the first CS domain bearer control channel (that is, the existing CS domain bearer control channel), and the IMS domain channel is a plurality of second IMS domain channels (that is, multiple sessions)
  • the process is as follows:
  • Step 501 The SCC AS detects that the service control channel Gm is unavailable.
  • the initial session between UE A and UE B is active, and the session between UE A and UE C is in a hold state.
  • Step 502 The SCC AS sends the session information to the S-CSCF.
  • Step 503 The S-CSCF forwards the session information to the MSC Server.
  • Step 504 The MSC Server establishes a second IMS domain channel between the MSC Server and the SCC AS for the currently activated tongue (the session between UE A and UE C), that is, sends an INVITE message to the SCC AS.
  • the replace header in the sent INVITE message carries the session identifier STI, to indicate that the second IMS domain channel is associated with the STI, so that the correspondence between the session information and the IMS domain channel of the tongue is saved in the MSC Server.
  • the SCC AS identifies the STI value to determine the session peer of the session corresponding to the STI value, and associates the existing peer connection with the second IMS domain channel.
  • Step 505 The SCC AS receives the INVITE message and returns a 200 OK response.
  • Step 506 If UE A wants to maintain the session in the active state, it needs to send a guarantee to UE B.
  • the TI value of the conversation between the UE A and the UE B is inserted into the TI value field of the hold request, and the MSC Server converts the request into a SIP format, and selects the second IMS domain channel forwarding according to the session STI value corresponding to the TI value.
  • the SCC AS executes the corresponding service logic, and forwards the request to the UE B, informing the UE B to perform the call hold process; at the same time, the MSC Server controls the MGW to stop the transmission of the media information, and disconnects the media transmission connection with the UE B. .
  • Step 507 If the UE A wants to resume the session in the hold state, it needs to send a recovery request to the UE C.
  • the TI value between the UE A and the UE C is inserted into the TI value domain of the recovery request, and the MSC Server controls the MGW in the original CS.
  • a media transmission connection with the UE C is established on the media transmission channel, and the implementation principle is the same as step 506.
  • the recovery request is forwarded to the SCC AS through the S-CSCF, and the SCC AS executes the corresponding service logic, and requests Forwarding to the MSC Server through the IMS domain channel, the MSC Server finds the corresponding TI value according to the STI value of the second IMS domain channel, and inserts the TI value into the threshold domain of the CS domain recovery request, and the UEA can determine the threshold value.
  • the recovery request initiated by which peer.
  • the CS domain part of the first CS bearer control channel is multiplexed by different sessions, and a new second IMS domain channel is established, and the second IMS domain channel is associated with each maintained state session, and the first CS is defaulted.
  • the IMS portion carrying the control channel is associated with the session of the current active state. If there is no session in the active state, as shown in the third embodiment, the policy may be applied, such as binding the earliest established session with the IMS part of the current first CS bearer control channel.
  • the flow of the fifth embodiment of the present invention is as shown in FIG. 6. Similar to the fourth embodiment, the embodiment shows that when the UE detects that the control channel Gm is unavailable, the CS domain part of the first CS bearer control channel is multiplexed.
  • the IMS domain part of the CS bearer control channel is associated with the session of the current active state, and a new second IMS domain channel is established between the MSC Server and the SCC AS for the other sessions except the active state, through the first CS bearer control channel. Transmitting the service control signaling of the IMS session with the newly created second IMS domain channel, the process is as follows: Step 601: UE A detects that the service control channel Gm is unavailable.
  • the initial session between UE A and UE B is active, and the session between UE A and UE C is in a hold state.
  • Step 602 UE A sends a hold request to the MSC Server on the CS domain part of the first CS domain bearer control channel.
  • the UE A first transfers the service control channel of the active state session to the bearer control channel of the CS domain, and sends a hold request on the CS domain partial connection of the first CS bearer control channel, and the hold request carries the TI value of UE A and UE B.
  • Step 603 The MSC Server associates the active state session with the IMS domain partial channel of the first CS bearer control channel.
  • the MSC Server determines that the TI value carried in the hold request is different from the threshold of the CS connection, and considers the hold request as a transfer request, and this is the first transfer request, thereby determining that the hold request is initiated by the active state session.
  • the transfer request associates the active session with the established IMS domain partial channel between the MSC Server and the SCC AS, and the SCC AS side defaults to the channel associated with the currently active state session.
  • Step 604 UE A sends a hold request to the MSC Server on the CS domain part of the first CS bearer control channel, where the request carries the TI value of UE A and UE C.
  • Step 605 The MSC Server establishes a second IMS domain channel between the MSC Server and the SCC AS for the session, that is, sends an INVITE message to the SCC AS.
  • the request is regarded as a transfer request, and the IMS domain part of the first CS bearer control channel is associated with the active state session, and the request is Establish a second IMS domain channel between the MSC Server and the AS.
  • the MSC Server initiates an INVITE request, and the request carries a threshold.
  • the header field may be added in the SIP request, the threshold value is written in the header field, or the threshold value is written in the first tag field of the replace header, and the SCC AS can identify The correspondence between the TI value and the established session, and associating the newly established IMS domain channel with the UE C session.
  • the subsequent steps are optional operations on the UE side:
  • Step 606 UE A keeps the session in the call state, sends a hold request to UE B, and inserts the TI value of the conversation between UE A and UE B into the CS domain request TI value domain, and the MSC Server judges in the saved TI value. Whether there is a TI value equal to the TI value in the request, and the IMS domain channel (ie, the IMS domain part of the first CS bearer control channel) that matches the TI value and the transmission service control signaling is determined, and the MSC Server will request It is converted to the SIP format and forwarded to the SCC AS through the corresponding channel.
  • the AS executes the corresponding service logic and sends the request to the peer end to notify the peer end to perform the call hold process.
  • the MSC Server controls the MGW to stop the transmission of the media information and disconnect the media transmission connection with the UE B.
  • Step 607 UE A recovers the ongoing session, sends a recovery request to UE C, inserts the TI value between UE A and UE C into the request TI value field, and the MSC Server finds the matching transmission service according to the method in step 606.
  • the channel for controlling signaling which translates the request into a SIP form and forwards it to the opposite end, and controls the MGW to establish a media transmission connection with the UE C on the original CS media transmission channel.
  • the UE C initiates a recovery request, and the request is forwarded to the SCC AS through the S-CSCF, and the SCC AS executes the corresponding service logic, and requests
  • the MSC server forwards the channel to the MSC Server through the newly established IMS domain channel.
  • the MSC Server finds the corresponding TI value according to the newly created IMS domain channel Dialog-ID, and inserts the CS domain retrieve request TI value.
  • the UE A can decide which peer to initiate according to the threshold value. Request, and resume the conversation state with the peer.
  • the UE A when the UE A detects that the service control channel is unavailable, the UE initiates a hold request on the established CS domain part, and the request is sent to the MSC Server, and carries the TI value allocated when the existing session is established, and the MSC Server It is recognized that the TI value is different from the TI value of the established CS domain part, and is regarded as a request for transferring the service control channel.
  • the ICS terminal establishes a session, the TI value of the CS domain is different from the PS domain threshold to keep the user.
  • Experience continuity when the UE A detects that the service control channel is unavailable, the UE initiates a hold request on the established CS domain part, and the request is sent to the MSC Server, and carries the TI value allocated when the existing session is established, and the MSC Server It is recognized that the TI value is different from the TI value of the established CS domain part, and is regarded as a request for transferring the service control channel.
  • the ICS terminal establishe
  • the UE first initiates the transfer of the active state session, that is, the value of the active state session is carried when the hold request is sent, and the MSC Server associates the active state session with the IMS domain part of the first CS bearer control channel by default. Store the TI value information of the active state session.
  • the UE then initiates a transfer request for the hold state session, the request carries the TI value of the hold state session, and the MSC Server establishes a new IMS domain channel between the MSC Server and the AS for each hold state session, that is, establishes multiple The second IMS domain channel, and the TI value of the hold state session is saved, and the TI value is formed in the MSC Server and the newly established IMS server and the AS IMS domain channel correspond to each other, and the TI value is carried in the request for establishing the channel.
  • FIG. 7 The flow of the sixth embodiment of the present invention is shown in FIG. 7.
  • This embodiment shows that when the control channel Gm is unavailable, different sessions multiplex the first CS bearer control channel.
  • the request carries the tongue identifier value TI
  • the MSC Server performs the CS signaling format to the SIP request format conversion, and adds a header field in the SIP request, and Adding a TI value to the header field causes the SCC AS to identify the target UE of the request, and the specific process is as follows:
  • Optional operation of the UE Converting the active session between UE A and UE B into a hold session, and restoring the session between UE A and UE C in a hold state.
  • Step 701 UE A maintains a session with the UE B in an active state, and sends a hold request to the MSC Server through the CS domain part of the first CS bearer control channel, where the UEA and the UE B are inserted in the hold request. TI value.
  • Step 702 The MSC Server converts the CS domain signaling (hold request) into SIP signaling, and fills in the SIP header field with the TI value.
  • Step 703 The MSC Server controls the MGW to stop media stream transmission with the UE B and maintain channel resources.
  • Step 704 The MSC Server sends a hold request to the SCC AS through the IMS domain part of the first CS bearer control channel, indicating that the session is placed in the hold state.
  • Step 705 to step 607 The SCC AS identifies the TI value in the hold request, determines that the sent peer is the UE B according to the TI value, and sends the request to the UE B through the S-CSCF.
  • Step 708 If the UEA wants to resume the call with the UE C, send a recovery request to the MSC Server through the CS domain part of the first CS bearer control channel, and insert the UE A into the request. TI value between UE C.
  • Step 709 The enhanced MSC Server converts the CS domain signaling (recovery request) into SIP signaling, and fills in the SIP header field with the TI value between UE A and UE C.
  • Step 710 The MSC Server controls the MGW to resume media stream transmission with the UE C.
  • Step 711 The MSC Server sends a recovery request to the SCC AS through the IMS domain part of the first CS bearer control channel, indicating that the session is restored to the active state.
  • Step 712 to step 714 The SCC AS identifies the threshold, and the value of the threshold is determined to be the UE C, and the request is sent to the UE C through the S-CSCF.
  • the SCC AS determines the TI value according to the STI value of the request session, and when the INVITE request is generated, adds the threshold value of the session in the header field in the INVITE request, and sends the value through the S-CSCF.
  • the MSC Server converts the SIP signaling into the CS domain signaling.
  • the UE A After receiving the INVITE request with the TI value, the UE A can determine the peer UE that sends the request according to the correspondence between the TI and the STI value.
  • the present invention also provides an embodiment of a system for implementing business continuity and an embodiment of an MSC server.
  • FIG. 8 A block diagram of an embodiment of a system for implementing business continuity of the present invention is shown in FIG. 8.
  • the system may include: an MSC server 810 and an application server AS820.
  • the MSC server 810 is configured to associate with at least two IMS sessions belonging to one session terminal, where the IMS session transmits service control signaling through a service control channel of the PS access network, and when the service control channel is unavailable, Carrying a control channel to transmit service control signaling of the IMS session, the CS bearer control channel including a CS domain part between the session terminal and the MSC server 810, and an IMS between the MSC server 810 and the AS 820 Domain part.
  • the MSC server 810 and the application server AS 820 can transmit the service control signaling of the IMS session by using the CS bearer control channel, and the method can be as follows: Create a CS bearer control channel, and transmit the IMS by using the new CS bearer control channel. Session business control Or signaling, transmitting, by using an existing CS bearer control channel, service control signaling of one of the at least two IMS sessions, creating a new CS bearer control channel, and transmitting by using the new CS bearer control channel Service control signaling for the remaining IMS sessions of an IMS session.
  • the CS bearer control channel includes a CS domain part between the session terminal and the MSC server 810, and an IMS domain part between the MSC server 810 and the application server AS820.
  • the MSC server 810 and the application server AS820 pass the CS bearer.
  • the service control signaling for transmitting the IMS session by the control channel may also be as follows: creating an IMS domain channel between the MSC server and the application server AS, passing the CS domain part of the existing CS bearer control channel and the newly created IMS Transmitting, by the domain channel, the service control signaling of the IMS session; or transmitting, by using the existing CS bearer control channel, service control signaling of one of the at least two IMS sessions, creating a new MSC server and an application server AS
  • the inter-IMS domain channel transmits traffic control signaling of the remaining IMS sessions of the one IMS session through the CS domain portion of the existing CS bearer control channel and the newly created IMS domain channel.
  • the service control signaling for transmitting the IMS session by using the CS bearer control channel between the MSC server 810 and the application server AS820 may also be as follows: multiplexing the existing CS bearer control channel to transmit the service control of the IMS session Signaling.
  • the MSC server includes: an association unit 910 and a transmission unit 920.
  • the association unit 910 is configured to associate with at least two IMS sessions belonging to one session terminal, where the IMS session transmits service control signaling through a service control channel of the PS access network; and the transmission unit 920 is configured to use the service control channel. When not available, the service control signaling of the IMS session is transmitted through the CS bearer control channel.
  • the transmission unit 920 may include the following unit (not shown in FIG. 9): a first CS bearer control channel newly constructed transmission unit, configured to newly establish a CS bearer control channel, and transmit the IMS session by using the newly established CS bearer control channel.
  • Service control signaling or second CS bearer control a channel newly created transmission unit, configured to transmit service control signaling of one of the at least two IMS sessions by using an existing CS bearer control channel, to newly establish a CS bearer control channel, and transmit the new CS bearer control channel by using Service control signaling for the remaining IMS sessions of the one IMS session.
  • the CS bearer control channel includes: a CS domain part between the session terminal and the mobile switching center MSC server, and an IMS domain part between the MSC server and the application server AS; the transmission unit 920 may further include the following unit (FIG. 9) Not shown in the following: a new transmission unit of the first IMS domain channel, configured to newly establish an IMS domain channel between the MSC server and the application server AS, and pass the CS domain part of the existing CS bearer control channel and the newly created IMS domain Transmitting, by the channel, the service control signaling of the IMS session; or the second IMS domain channel, the new transmission unit, transmitting the service control signaling of one of the at least two IMS sessions by using the existing CS bearer control channel, and newly creating The IMS domain channel between the MSC server and the application server AS transmits the service control signaling of the remaining IMS session of the one IMS session through the CS domain part of the existing CS bearer control channel and the newly created IMS domain channel.
  • the transmission unit 920 may also include a unit (not shown in FIG. 9): a multiplex CS bearer control channel transmission unit, configured to multiplex the existing CS bearer control channel to transmit the service control signaling of the IMS session.
  • FIG. 10 A block diagram of an embodiment of the session terminal of the present invention is shown in FIG. 10.
  • the session terminal includes: an association unit 1010 and a service control signaling interaction unit 1020.
  • the IMS session transmits the service control signaling by using the service control channel of the PS access network;
  • the service control signaling interaction unit 1020 is configured to perform the service control of the IMS session by using the CS bearer control channel when the service control channel is unavailable. Signaling interaction.
  • the terminal terminal may further include (not shown in FIG. 10): a detecting unit, configured to detect whether the service control channel is available; and the service control signaling interaction unit 1020 is specifically configured to detect in the detecting unit When the service control channel is unavailable, the CS bearer control signal is passed. The channel performs the interaction of the service control signaling of the IMS session.
  • the terminal terminal may further include (not shown in FIG. 10): a sending call requesting unit, configured to send a CS call request to the MSC server when the service control channel is unavailable, where the CS call request includes a session The address information of the peer end to establish a new CS bearer control channel; or the receiving call request and suspension unit, configured to receive an IMS call request forwarded by the MSC server when the service control channel is unavailable, the IMS call request by the AS The server sends, the IMS domain call request includes the address information of the session end of the call, and the call request is suspended according to the address information of the session peer to establish a new CS bearer control channel.
  • the service control signaling interaction unit 1020 is specifically configured to perform the interaction of the service control signaling of the IMS session by using the new CS bearer control channel when the service control channel is unavailable.
  • the CS bearer control channel includes a CS domain part between the session terminal and the MSC server, and an IMS domain part between the MSC server and the application server AS.
  • the session terminal may further include (not shown in FIG. 10): Send and hold a requesting unit, configured to send a hold request to the MSC server, where the hold request carries a TI value, so that the MSC sends an invite message carrying the TI value to the AS, to establish an IMS domain channel corresponding to the TI value.
  • the AS is configured to associate the IMS domain channel with the IMS session peer end corresponding to the TI value; the service control signaling interaction unit 1020 is specifically configured to: when the service control channel is unavailable, pass the existing The CS domain part of the CS bearer control channel interacts with the IMS domain channel corresponding to the TI value to perform service control signaling of the IMS session corresponding to the TI value.
  • the server is associated with at least two IMS sessions belonging to one session terminal, and the IMS session transmits service control signaling through the service control channel of the PS domain network, when the service control channel is unavailable. Transmitting the service control signaling of the IMS session through the CS bearer control channel.
  • the embodiment of the present invention can restore the control of multiple sessions, and ensure the smooth flow of the session service, when the service control channel is unavailable, and the control signaling cannot be transmitted, thereby causing the session service, especially if the state session service fails. The user experience is not lost, so the user experience is improved. It will be apparent to those skilled in the art that the present invention can be implemented by means of software plus the necessary general hardware platform.
  • the technical solution of the present invention which is essential or contributes to the prior art, may be embodied in the form of a software product, which may be stored in a storage medium such as a ROM/RAM or a disk. And an optical disk or the like, including a plurality of instructions for causing a computer device (which may be a personal computer, a server, or a network, the embodiments of the present invention described above, and does not constitute a limitation on the scope of the present invention. Anything in the spirit of the present invention Modifications, equivalent substitutions and improvements made within the principles are intended to be included within the scope of the invention.

Description

实现业务连续性的方法、 系统、 MSG服务器及会话终端
本申请要求于 2009 年 04 月 22 日提交中国专利局、 申请号为 200910137303.7, 发明名称为"实现业务连续性的方法、 系统、 MSC月良务器 及会话终端"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
本发明涉及通信技术领域, 特别涉及实现业务连续性的方法、 系统、 MSC ( Mobile Switching Center, 移动交换中心)服务器及^舌终端。 发明背景
IMS ( IP Multimedia Sub-system, IP多媒体子系统) ^^于 IP交换的 业务网络, 其核心是 CSCF ( Call Session Control Function, 呼叫会话控制功 能)和各种 AS ( Application Server,应用服务器), 其中 S-CSCF负责在满 足条件时将呼叫请求路由到正确的 AS, 由 AS执行业务逻辑。 在前向 IMS 网络演进过程中, 需要保证用户在不同接入方式, 例如 CS ( Circuit Switch, 电路交换)接入后 PS ( Packet Switching, 分组交换)接入时的业务体验一 致。 为此 3GPP提出了 ICS ( IMS Centralized Service, IMS集中业务控制) 功能。 ICS在保持 IMS核心网子系统对业务的集中控制的前提下, 打破了 只能通过 PS网 矣入 IMS业务的局限, 将 IMS业务承载网络进一步扩展 到了传统 CS网络。
如图 1所示,为现有 ICS架构示意图,其中 SCC ( Service Centralization and Continuity, 集中业务和业务连续性) AS执行 ICS业务逻辑, ICS UE (用户终端 )和 SCC AS之间建立了 Gm或 II接口, 作为业务控制信道传 输控制信令, ICS UE与 AS间建立承载控制信道, 完成对媒体承载的传输 控制等作用, 承载控制信道可供不同会话复用, 其由两部分组成, 分别是 UE与 MSC Server间 CS域承载控制信道以传输 CS域信令, MSC Server 与 SCC AS间的 IMS域承载控制信道, 传输由 MSC Server将 CS域信令转 化的 SIP信令。 SCC AS合并 Gm或 II接口上的业务控制信令和 CS承载的 描述, 以代表 UE呈现一个标准的 IMS会话。 ICS UE是一个增强了 ICS能 力的 IMS UE,建立承载控制信令路径,以通过 CS域建立媒体。 MSC Server 增强了 ICS功能, 对于被识别的 ICS用户, 增强的 MSC Server执行 CS信 令和 IMS SIP ( Session Initiation Protocol, 会话启动协议 )信令转换, 支持 多媒体呼叫, 对于没有识别为 ICS用户的用户, MSC Server功能不改变。
发明人在对现有技术的研究过程中发现, 基于上述 ICS架构当 IMS会 话由 PS接入时, 可以通过 CS域作为承载媒体的通道, 并使用 Gm接口作 为业务控制信道, 当用户由 PS接入转到由只有 CS接入的情况, 媒体内容 仍可通过 CS域承载,但是此时 Gm接口失效, 由此导致会话的业务控制信 道失效, 用户无法对会话进行控制。 假设用户包含多个会话, 并且其中一 个会话处于激活状态, 一个或多个会话在保持状态, 则因业务控制信道不 可用,用户无法恢复保持状态的会话,而只能由 AS将所有保持的会话释放。 上述由于控制信道失效而将保持会话释放的方式, 使得用户无法恢复保持 的会话, 从而造成用户会话丢失, 体验下降。 发明内容
本发明实施例的目的在于提供实现业务连续性的方法、 系统、 MSC服 务器及会话终端, 以解决当业务控制信道不可用时无法恢复保持状态会话 的问题。
为解决上述技术问题, 本发明提供如下技术方案:
一种实现业务连续性的方法, 包括:
与属于一个会话终端的至少两个 IP多媒体子系统 IMS会话关联,所述 IMS ^舌通过分组交换 PS接入网络的业务控制信道传输业务控制信令; 当所述业务控制信道不可用时,通过电路交换 CS承载控制信道传输所 述 IMS会话的业务控制信令。
一种实现业务连续性的系统, 包括: 移动交换中心 MSC服务器、 应用 服务器 AS,
所述 MSC服务器,用于与属于一个会话终端的至少两个 IMS会话关联, 所述 IMS ^舌通过 PS接入网络的业务控制信道传输业务控制信令,当所述 业务控制信道不可用时, 通过 CS承载控制信道传输所述 IMS会话的业务 控制信令, 所述 CS承载控制信道包括所述会话终端与 MSC服务器之间的 CS域部分, 以及所述 MSC服务器与所述 AS之间的 IMS域部分。
一种 MSC服务器, 包括:
关联单元, 用于与属于一个会话终端的至少两个 IMS会话关联, 所述 IMS ^舌通过 PS接入网络的业务控制信道传输业务控制信令;
传输单元, 用于当所述业务控制信道不可用时, 通过 CS承载控制信道 传输所述 IMS会话的业务控制信令。
一种会话终端, 包括:
关联单元, 用于将至少两个 IMS会话与 MSC服务器关联, 所述 IMS ^舌通过 PS接入网络的业务控制信道传输业务控制信令;
业务控制信令交互单元, 用于当所述业务控制信道不可用时, 通过 CS 承载控制信道进行所述 IMS会话的业务控制信令的交互。
由以上本发明提供的技术方案可见, 本发明实施例中服务器与属于一 个会话终端的至少两个 IP多媒体子系统 IMS会话关联, 所述 IMS会话通 过分组交换 PS接入网络的业务控制信道传输业务控制信令, 当所述业务控 制信道不可用时, 通过电路交换 CS承载控制信道传输所述 IMS会话的业 务控制信令。 应用本发明实施例可以在业务控制信道不可用, 无法传输控 制信令从而导致会话业务, 特别是保持状态会话业务失败的情况下, 能够 恢复对多个会话的控制, 保证了会话业务的畅通, 使用户会话不会丢失, 从而提高了用户体验。 附图简要说明
此处所说明的附图用来提供对本发明的进一步理解, 构成本申请的一 部分, 并不构成对本发明的限定。 在附图中:
图 1为现有 ICS架构的示意图;
图 2为本发明实现业务连续性的方法的第一实施例流程图;
图 3为本发明实现业务连续性的方法的第二实施例流程图;
图 4为本发明实现业务连续性的方法的第三实施例流程图;
图 5为本发明实现业务连续性的方法的第四实施例流程图;
图 6为本发明实现业务连续性的方法的第五实施例流程图;
图 7为本发明实现业务连续性的方法的第六实施例流程图;
图 8为本发明会话业务恢复系统的实施例框图;
图 9为本发明 MSC服务器的实施例框图;
图 10为本发明会话终端的实施例框图。 实施本发明的方式
本发明实施例提供了实现业务连续性的方法、 系统、 MSC服务器及会 话终端, 服务器与属于一个会话终端的至少两个 IMS会话关联, 当业务控 制信道不可用时, 通过 CS承载控制信道传输 IMS会话的业务控制信令。
为了使本技术领域的人员更好地理解本发明方案, 并使本发明的上述 目的、 特征和优点能够更加明显易懂, 下面结合附图和具体实施方式对本 发明作进一步详细的说明。
本发明第一实施例流程如图 2所示:
步骤 201 : 与属于一个会话终端的至少两个 IMS会话关联。
其中, IMS会话通过 PS域网络的业务控制信道传输业务控制信令, 并 通过已存在的 CS承载传输媒体。 步骤 202: 当业务控制信道不可用时, 通过 CS承载控制信道传输 IMS 会话的业务控制信令。
其中, 业务控制信道不可用包括: 会话终端检测到业务控制信道不可 用; 或服务器检测到所述业务控制信道不可用。
具体的, 通过 CS承载控制信道传输所述 IMS会话的业务控制信令可 以包括: 新建 CS承载控制信道, 通过所述新建 CS承载控制信道传输所述 IMS会话的业务控制信令; 或者,通过已存在的 CS承载控制信道传输所述 至少两个 IMS会话中的一个 IMS会话的业务控制信令, 新建 CS承载控制 信道,通过所述新建 CS承载控制信道传输除所述一个 IMS会话的剩余 IMS 会话的业务控制信令。
具体的, CS承载控制信道包括: 会话终端与移动交换中心 MSC服务 器之间的 CS域部分, 以及 MSC服务器与应用服务器 AS之间的 IMS域部 分, 通过 CS承载控制信道传输所述 IMS会话的业务控制信令还可以包括: 新建 MSC服务器与应用服务器 AS之间的 IMS域信道, 通过已存在的 CS 承载控制信道的 CS域部分和所述新建的 IMS域信道传输所述 IMS会话的 业务控制信令;或者,通过已存在的 CS承载控制信道传输所述至少两个 IMS 会话中的一个 IMS会话的业务控制信令, 新建 MSC服务器与应用服务器 AS之间的 IMS域信道, 通过已存在的 CS承载控制信道的 CS域部分和所 述新建的 IMS域信道传输除所述一个 IMS会话的剩余 IMS会话的业务控制 信令。
具体的, 通过 CS承载控制信道传输所述 IMS会话的业务控制信令也 可以包括: 复用已存在的 CS承载控制信道传输所述 IMS会话的业务控制 信令。
由上述实施例可知, 在业务控制信道不可用的情况下, 能够恢复对多 个会话的控制, 保证了会话业务的畅通, 使用户会话不会丢失, 从而提高 了用户体验。 下述进一步详细描述本发明方法的各实施例中, 假设 UE A与 UE B间 的会话处于激活状态, UE A与 UE C间的会话处于保持状态, UE A从有 PS域和 CS域同时覆盖的区域转换到只有 CS域覆盖的区域,导致业务控制 信道不可用, 如从 UMTS网络到 GSM覆盖的网络时的会话业务恢复过程。
本发明第二实施例流程如图 3所示,该实施例示出了 UE检测出业务控 制信道不可用时,将已存在的 CS域承载控制信道与当前激活状态的会话关 联, 通过发起 CS呼叫通知 AS将业务控制信道转移到 CS域, 并在 CS域 为一个保持状态的会话重新建立 CS承载,同时相应建立新的 CS承载控制 信道, 也就是利用第一 CS域承载控制信道(也就是已存在的 CS域承载控 制信道)传输第一个呼叫的业务控制信令, 并为第二个呼叫建立第二 CS域 承载控制信道(也就是新建的 CS承载控制信道), 其过程下:
步骤 301 : UE A检测出业务控制信道 Gm不可用。
初始 UE A与 UE B之间的会话处于激活状态, UE A与 UE C之间的会 话处于保持状态。
每个会话建立时 SCC AS都为其分配一个 TI值, 按照会话建立的时间 顺序, 最早建立的第一个会话的 Ή值为 0 (目前可用的最大 Ή值为 7 ), 后 续建立的会话的 TI值顺次加 1。 建立会话时 SCC AS会将 TI值通知相应的 UE, 因此 SCC AS与各个 UE中都保存着一致的会话 Ή值。 或者, 也可以 是 UE来分配 Ή值。 若是 UE分配, 则由 UE将 Ή值通知相应 UE。
另夕卜, 除了为每个会话分配上述 Ή值外, 还同时分配一个 STI值, 用 于 UE请求 SCC AS转移会话时识别指定的会话。
步骤 302: UE A在第一 CS域承载控制信道上发起对 UE B的保持请求。
UE A通过第一 CS域承载控制信道向 UE B发送保持请求,请求将 UE A与 UE B之间激活状态的会话变为保持状态的会话。
步骤 303至步骤 304: UEA发起一个新的 CS呼叫, 请求建立第二 CS 域承载控制信道。 UE A执行一个标准的 CS域呼叫过程, 向 MSC Server发送 CS呼叫请 求, MSC server生成 INVITE消息,其中包含 MGW SDP信息和 UE C的地 址信息, 该 INVITE消息经过 S-CSCF转发到 SCC AS, 由 SCC AS执行相 应的业务逻辑。 当上述 CS域呼叫过程执行完毕后, 相应建立起新的 CS承 载和新的 CS域的承载控制信道。
若 UE C的地址信息为 tell URI形式,则可在 INVITE消息中携带 UE C 的号码, 由 AS识别出 UE A与 UE C之间已存在会话连接, 则将新建立的 承载与该会话连接关联; 若 UE C的地址信息若为非 tell URI形式, 则在 INVITE消息中携带 UE C的 STN值和会话相关的 TI值, STN为一个公共 电话号码, 将该 TI值写入 CS域请求的 TI值域, 并将 TI值中 TI flag字段 置 0, (若由对端发起呼叫, MSC Server转换为 CS域请求时 TI flag置 1, 后同), 使 SCC AS根据 STN、 Ή值识别出该会话是为相关的 Ή值的原始 会话转移业务控制信道而发送的请求,从而 SCC AS将新建立的 CS承载与 该会话对端关联。
步骤 305至步骤 307: SCC AS检测到 UE A和 UE C之间已建立会话连 接, 则通过 S-CSCF发送 re-INVITE消息到 UE C, 以使得第二 CS域承载 控制信道与已存在的 AS和 UE C之间的会话连接关联。
步骤 308: 通过第二 CS域承载控制信道保持 UE A与 UE C间的会话。 步骤 309: 通过第一 CS域承载控制信道恢复 UE A与 UE B间会话的 通话状态。
需要说明的是,上述实施例中第一 CS域承载控制信道默认与当前处于 激活状态的会话(UE A与 UE B之间的会话) 关联, 若当前会话都处于保 持状态,则可根据预定策略将指定的一个保持会话与第一 CS域承载控制信 道关联, 如该策略为将最早建立的会话与第一 CS域承载控制信道相关联, 将第二 CS域承载控制信道与时间上第二个建立的会话关联。
需要说明的是, 如果按照 24.008的规定, 则同一时间只能同时存在两 个建立( setup )消息, 因而对其它没有恢复控制的会话, UE可以将其释放。 本发明第三实施例流程如图 4所示,该实施例示出了当 SCC AS检测出 控制信道 Gm不可用时,由 SCC AS发起新的 CS呼叫,与第二实施例相同, 第一 CS域承载控制信道(也就是已存在的 CS域承载控制信道)传输一个 会话的业务控制信令,而新建立的第二 CS域承载控制信道与另一个会话关 联, 通过第二 CS域承载控制信道控制该另一个会话, 其过程如下:
步骤 401 : SCC AS检测出业务控制信道 Gm不可用。
初始 UE A与 UE B之间的会话处于激活状态, UE A与 UE C之间的会 话处于保持状态。
步骤 402至步骤 404: SCC AS发起与 UE A的呼叫请求, 请求的 SIP 头域 P-Asserted-Identity中包含对端 UE C的地址信息( tell URI形式的地址 信息),以使得 UEA能够决策到该呼叫请求是请求建立 UE C与 UE A间的 第二 CS域承载控制信道。该呼叫请求由 S-CSCF转发至 MSC Server, MSC Server建立与 UEA间的 CS域呼叫。
步骤 405: UE A收到呼叫请求后, 选择挂起该呼叫请求, 这是因为 UE A与 UE B间的会话处于激活状态, 该挂起操作 UE A的用户不会感知。
步骤 406: 完成对 UE A与 UE C之间的保持会话的第二 CS域承载控 制信道的建立过程。
另外, 同第二实施例, 上述实施例中第一 CS域的承载控制信道默认与 当前处于激活状态的会话(UE A与 UE B之间的 ^舌) 关联, 若当前会话 都处于保持状态,则可根据预定策略将指定的一个保持会话与第一 CS域承 载控制信道关联,如该策略为将最早建立的会话与已存在的 CS域承载控制 信道相关联。
本发明第四实施例流程如图 5所示,该实施例示出了 AS检测出业务控 制信道 Gm不可用, 不同会话复用 UE与 MSC Server之间第一 CS域承载 控制信道的 CS域部分,默认第一 CS承载控制信道的 IMS域部分与当前激 活状态的会话关联,为除激活状态的其它会话分别在 MSC Server与 SCC AS 之间建立新的 IMS域信道, SCC AS将会话信息发送到 MSC Server, 会话 信息包括每个会话的 TI值、 STI值、 会话的状态信息, 使得 MSC Server获 知会话信息并为除激活状态的会话发送 INVITE消息至 SCC AS, 建立 IMS 域信道。 或者, 所述 Ή值也可以是可选的信息。
该实施例示出了不同会话共用 UE与 MSC Server间的 CS域承载, 且 在不同 MSC Server与 SCC AS之间的 IMS域信道上传输控制信令,可以根 据 CS域呼叫的 TI值来区分不同的会话, 其中共用的 CS域承载为第一 CS 域承载控制信道(也就是已存在的 CS域承载控制信道) 的 CS部分, IMS 域信道是多个第二 IMS域信道(也就是为多个会话分别新建的多个 IMS域 信道), 其过程如下:
步骤 501 : SCC AS检测出业务控制信道 Gm不可用。
初始 UE A与 UE B之间的会话处于激活状态, UE A与 UE C之间的会 话处于保持状态。
步骤 502: SCC AS将会话信息发送到 S-CSCF。
步骤 503: S-CSCF转发会话信息给 MSC Server。
步骤 504: MSC Server对当前激活 ^舌外的^舌( UE A与 UE C间的 会话 )建立 MSC Server与 SCC AS间的第二 IMS域信道, 即发送 INVITE 消息到 SCC AS。
所发送的 INVITE消息中的 replace头携带会话标识 STI, 以指示第二 IMS域信道与该 STI对应^舌相关联, 因而在 MSC Server中保存了会话信 息与该 ^舌的 IMS域信道的对应关系, SCC AS识别 STI值决策出与 STI 值对应会话的会话对端, 并将已存在的对端连接与第二 IMS域信道关联。
步骤 505: SCC AS收到 INVITE消息, 返回 200 OK响应。
后续步骤均为 UE侧的可选操作:
步骤 506: UE A如要将激活状态的会话保持, 则需要向 UE B发送保 持请求,该请求中将 UE A与 UE B间对话的 TI值插入保持请求的 TI值域, 由 MSC Server将请求转换为 SIP形式,根据 TI值对应的会话 STI值选择第 二 IMS域信道转发保持请求至 SCC AS, SCC AS执行相应业务逻辑, 并将 请求转发至 UE B, 通知 UE B执行通话保持过程; 同时 MSC Server控制 MGW停止媒体信息的传输, 断开与 UE B间的媒体传输连接。
步骤 507: UE A如要将保持状态的会话恢复, 则需要向 UE C发送恢 复请求,该请求中将 UE A与 UE C间的 TI值插入恢复请求的 TI值域, MSC Server控制 MGW在原 CS媒体传输信道上建立与 UE C的媒体传输连接, 实现原理同步骤 506。
另外, 如果 UE A与 UE C间的会话是由 UE C发起保持请求, 并且由 UE C发起恢复请求, 则恢复请求通过 S-CSCF转发到 SCC AS, SCC AS执 行相应的业务逻辑, 并将请求通过 IMS域信道转发至 MSC Server, MSC Server根据第二 IMS域信道的 STI值找到对应 TI值, 并将该 TI值插入 CS 域恢复请求的 Ή值域中, UEA ^居该 Ή值可以决策出由哪个对端发起的 恢复请求。
由上述实施例可知,不同会话复用第一 CS承载控制信道的 CS域部分, 并建立新的第二 IMS域信道,将第二 IMS域信道与各保持状态的会话关联, 并默认第一 CS承载控制信道的 IMS部分与当前激活状态的会话关联。 若 当前无激活状态的会话, 则如第三实施例所示, 可才 据策略, 比如将最早 建立的会话与当前第一 CS承载控制信道的 IMS部分绑定。
本发明第五实施例流程如图 6所示, 与实施例四相似, 该实施例示出 了当 UE检测出控制信道 Gm不可用时, 复用第一 CS承载控制信道的 CS 域部分, 默认第一 CS承载控制信道的 IMS域部分与当前激活状态的会话 关联, 为除激活状态的其它会话分别在 MSC Server与 SCC AS之间建立新 的第二 IMS域信道, 通过所述第一 CS承载控制信道和新建的第二 IMS域 信道传输所述 IMS会话的业务控制信令, 其过程如下: 步骤 601 : UE A检测出业务控制信道 Gm不可用。
初始 UE A与 UE B之间的会话处于激活状态, UE A与 UE C之间的会 话处于保持状态。
步骤 602: UE A在第一 CS域承载控制信道 CS域部分上向 MSC Server 发送保持请求。
UE A首先将激活状态会话的业务控制信道转移到 CS域的承载控制信 道, 在第一 CS承载控制信道的 CS域部分连接上发送保持请求, 该保持请 求携带 UE A与 UE B的 TI值。
步骤 603: MSC Server将激活状态的会话与第一 CS承载控制信道的 IMS域部分信道关联。
MSC Server判断出保持请求中携带的 TI值与 CS连接的 Ή值不同,则 将该保持请求视为转移请求, 且此为第一个转移请求, 由此判断该保持请 求为激活状态会话发起的转移请求, 将该激活状态的会话与已建立的 MSC Server与 SCC AS间的 IMS域部分信道关联,在 SCC AS侧默认该信道与当 前激活状态的会话关联。
步骤 604: UE A在第一 CS承载控制信道的 CS域部分上向 MSC Server 发送保持请求, 请求中携带 UE A与 UE C的 TI值。
步骤 605: MSC Server为该会话建立 MSC Server与 SCC AS间第二 IMS 域信道, 即发送 INVITE消息到 SCC AS。
MSC Server判断出保持请求中携带的 TI值与 CS域部分的 TI值不同 时, 将该请求视为转移请求, 第一 CS承载控制信道的 IMS域部分已与激 活状态会话关联,则为此请求建立 MSC Server与 AS间的第二 IMS域信道。 MSC Server发起 INVITE请求, 请求中携带 Ή值, 可在 SIP请求中增加头 域, 在该头域写入 Ή值, 或将 Ή值写入 replace头的第一个 tag域中, SCC AS能够识别该 TI值与已建立的会话的对应关系, 并将新建立的 IMS域信 道与 UE C会话关联。 后续步骤均为 UE侧的可选操作:
步骤 606: UE A将通话状态的会话保持, 则向 UE B发送保持请求, 并将 UE A与 UE B间对话的 TI值插入 CS域请求 TI值域, MSC Server在 所保存的 TI值中判断是否有与请求中 TI值相等的 TI值, 决策出有与^目 匹配的 TI值及传输业务控制信令的 IMS域信道(即第一 CS承载控制信道 的 IMS域部分), MSC Server将请求转换为 SIP形式, 通过对应信道转发 至 SCC AS, AS执行相应业务逻辑, 并将请求发送至对端, 通知对端执行 通话保持过程。 MSC Server控制 MGW停止媒体信息的传输, 断开与 UE B 间的媒体传输连接。
步骤 607: UE A将保持中的会话恢复, 则向 UE C发送恢复请求, 将 UE A与 UE C间 TI值插入请求 TI值域, MSC Server按步骤 606中的方法 找到与之匹配的传输业务控制信令的信道, 将请求转化为 SIP形式转发至 对端,并控制 MGW在原 CS媒体传输信道上建立与 UE C的媒体传输连接。
另夕卜, 如果 UE A与 UE C间^舌是由 UE C发起保持请求, 则由 UE C 发起恢复请求, 请求通过 S-CSCF转发到 SCC AS, SCC AS执行相应的业 务逻辑,并将请求通过新建立的 IMS域信道转发至 MSC Server, MSC Server 根据新建 IMS域信道 Dialog-ID找到对应 TI值,并插入 CS域 retrieve请求 TI值中, UE A根据 Ή值可以决策出由哪个对端发起的请求, 并恢复与该 对端对话的通话状态。
由上述实施例可见, UE A检测到业务控制信道不可用时, 则在已建立 的 CS域部分上发起保持请求, 该请求发送到 MSC Server, 并携带已有会 话建立时分配的 TI值, MSC Server识别出该 TI值与已建立的 CS域部分的 TI值不同,将其视为转移业务控制信道的请求,规定 ICS终端建立会话时, 其 CS域的 TI值与 PS域 Ή值不同以保持用户体验连续性。 UE首先发起对 激活状态会话的转移, 即发送保持请求时携带激活状态会话的 Ή值, MSC Server默认将激活状态会话与第一 CS承载控制信道的 IMS域部分关联,保 存激活状态会话的 TI值信息。 UE再顺次发起对保持状态会话的转移请求, 请求中携带保持状态会话的 TI值, MSC Server为每个保持状态会话分别建 立新的 MSC Server与 AS间的 IMS域信道, 即建立多个第二 IMS域信道, 并保存保持状态会话的 TI值, 在 MSC Server中形成 TI值与新建立 MSC Server与 AS间 IMS域信道的对应关系, 同时在建立信道的请求中携带 TI 值。
本发明第六实施例流程如图 7 所示, 该实施例示出了当控制信道 Gm 不可用后, 不同会话复用第一 CS承载控制信道。 在 ICS UE A发起 CS域 请求时, 为区分不同^舌,请求中带有^舌标识值 TI, MSC Server执行 CS 信令格式到 SIP请求格式转换,并在 SIP请求中增加头域,通过向该头域中 添入 TI值使得 SCC AS识别出该请求的目的 UE, 其具体过程如下:
UE可选操作: 将 UE A与 UE B间处于激活状态的会话转换为保持状 态的会话, 恢复 UE A与 UE C间处于保持状态的会话。
步骤 701 : UE A将与 UE B间处于激活状态的会话保持, 并向 MSC Server通过第一 CS承载控制信道的 CS域部分发送保持请求, 该保持请求 中插入 UE A与 UE B间^舌的 TI值。
步骤 702: MSC Server将 CS域信令(保持请求 )转化为 SIP信令, 并 在 SIP头域中填入 TI值。
步骤 703: MSC Server控制 MGW停止与 UE B间的媒体流传送并保持 信道资源。
步骤 704: MSC Server通过第一 CS承载控制信道的 IMS域部分将保 持请求发送到 SCC AS, 指明该会话被置为保持状态。
步骤 705至步骤 607: SCC AS识别保持请求中的 TI值, 根据 TI值确 定发送的对端为 UE B, 通过 S-CSCF将请求发送到 UE B。
步骤 708: UEA如果要恢复与 UE C间的通话, 则向 MSC Server通过 第一 CS承载控制信道的 CS域部分发送恢复请求, 该请求中插入 UE A与 UE C间的 TI值。
步骤 709: 增强的 MSC Server将 CS域信令(恢复请求 )转化为 SIP 信令, 并在 SIP头域中填入 UE A与 UE C间^舌的 TI值。
步骤 710: MSC Server控制 MGW恢复与 UE C间的媒体流传输。
步骤 711 : MSC Server通过第一 CS承载控制信道的 IMS域部分将恢 复请求发送到 SCC AS, 指明该会话恢复为激活状态。
步骤 712至步骤 714: SCC AS识别 Ή值, ^居 Ή值确定发送的对端 为 UE C, 通过 S-CSCF将请求发送到 UE C。
上述实施例中, 如果 UE A作为被叫, 则 SCC AS根据请求对话的 STI 值确定 TI值, 在生成 INVITE请求时, 在 INVITE请求中的头域中添加会 话的 Ή值, 通过 S-CSCF发送到 UE A端 MSC Server, MSC Server将 SIP 信令转化为 CS域信令, UE A收到带有 TI值的 INVITE请求后, 根据 TI 与 STI值的对应关系可以确定发送请求的对端 UE。
与本发明实现业务连续性的方法的实施例相对应, 本发明还提供了实 现业务连续性的系统的实施例和 MSC服务器的实施例。
本发明实现业务连续性的系统的实施例框图如图 8所示, 该系统可以 包括: MSC月良务器 810和应用月良务器 AS820。
其中, MSC服务器 810用于与属于一个会话终端的至少两个 IMS会话 关联, 所述 IMS会话通过 PS接入网络的业务控制信道传输业务控制信令, 当所述业务控制信道不可用时, 通过 CS承载控制信道传输所述 IMS会话 的业务控制信令, 所述 CS承载控制信道包括所述会话终端与 MSC服务器 810之间的 CS域部分,以及所述 MSC服务器 810与所述 AS820之间的 IMS 域部分。
具体的, MSC服务器 810与应用服务器 AS820之间通过 CS承载控制 信道传输所述 IMS会话的业务控制信令可以采用如下方式: 新建 CS承载 控制信道, 通过所述新建 CS承载控制信道传输所述 IMS会话的业务控制 信令; 或者, 通过已存在的 CS承载控制信道传输所述至少两个 IMS会话 中的一个 IMS会话的业务控制信令, 新建 CS承载控制信道, 通过所述新 建 CS承载控制信道传输除所述一个 IMS会话的剩余 IMS会话的业务控制 信令。
具体的, 所述 CS承载控制信道包括会话终端与 MSC服务器 810之间 的 CS域部分,以及 MSC服务器 810与应用服务器 AS820之间的 IMS域部 分; MSC服务器 810与应用服务器 AS820之间通过 CS承载控制信道传输 所述 IMS会话的业务控制信令也可以采用如下方式:新建 MSC服务器与应 用服务器 AS之间的 IMS域信道, 通过已存在的 CS承载控制信道的 CS域 部分和所述新建的 IMS域信道传输所述 IMS会话的业务控制信令; 或者, 通过已存在的 CS承载控制信道传输所述至少两个 IMS会话中的一个 IMS 会话的业务控制信令,新建 MSC服务器与应用服务器 AS之间的 IMS域信 道,通过已存在的 CS承载控制信道的 CS域部分和所述新建的 IMS域信道 传输除所述一个 IMS会话的剩余 IMS会话的业务控制信令。
具体的, MSC服务器 810与应用服务器 AS820之间通过 CS承载控制 信道传输所述 IMS会话的业务控制信令还可以采用如下方式: 复用已存在 的 CS承载控制信道传输所述 IMS会话的业务控制信令。
本发明 MSC服务器的实施例框图如图 9所示, 该 MSC服务器包括: 关联单元 910和传输单元 920。
其中, 关联单元 910用于与属于一个会话终端的至少两个 IMS会话关 联,所述 IMS会话通过 PS接入网络的业务控制信道传输业务控制信令;传 输单元 920用于当所述业务控制信道不可用时,通过 CS承载控制信道传输 所述 IMS会话的业务控制信令。
其中, 传输单元 920可以包括如下单元(图 9中未示出): 第一 CS承 载控制信道新建传输单元, 用于新建 CS承载控制信道, 通过所述新建 CS 承载控制信道传输所述 IMS会话的业务控制信令; 或者第二 CS承载控制 信道新建传输单元,用于通过已存在的 CS承载控制信道传输所述至少两个 IMS会话中的一个 IMS会话的业务控制信令, 新建 CS承载控制信道, 通 过所述新建 CS承载控制信道传输除所述一个 IMS会话的剩余 IMS会话的 业务控制信令。
其中, 所述 CS承载控制信道包括: 会话终端与移动交换中心 MSC服 务器之间的 CS域部分, 以及 MSC服务器与应用服务器 AS之间的 IMS域 部分; 传输单元 920还可以包括如下单元(图 9中未示出 ): 第一 IMS域信 道新建传输单元,用于新建 MSC服务器与应用服务器 AS之间的 IMS域信 道,通过已存在的 CS承载控制信道的 CS域部分和所述新建的 IMS域信道 传输所述 IMS会话的业务控制信令; 或者第二 IMS域信道新建传输单元, 通过已存在的 CS承载控制信道传输所述至少两个 IMS会话中的一个 IMS 会话的业务控制信令,新建 MSC服务器与应用服务器 AS之间的 IMS域信 道,通过已存在的 CS承载控制信道的 CS域部分和所述新建的 IMS域信道 传输除所述一个 IMS会话的剩余 IMS会话的业务控制信令。
其中, 传输单元 920也可以包括如下单元(图 9中未示出 ): 复用 CS 承载控制信道传输单元,用于复用已存在的 CS承载控制信道传输所述 IMS 会话的业务控制信令。
本发明会话终端的实施例框图如图 10所示, 该会话终端包括: 关联单 元 1010和业务控制信令交互单元 1020。 所述 IMS会话通过 PS接入网络的业务控制信道传输业务控制信令;业务控 制信令交互单元 1020用于当所述业务控制信道不可用时, 通过 CS承载控 制信道进行所述 IMS会话的业务控制信令的交互。
进一步, 该^舌终端还可以包括(图 10 中未示出): 检测单元, 用于 检测所述业务控制信道是否可用; 所述业务控制信令交互单元 1020具体用 于在所述检测单元检测到所述业务控制信道不可用时,通过 CS承载控制信 道进行所述 IMS会话的业务控制信令的交互。
进一步, 该^舌终端还可以包括(图 10 中未示出): 发送呼叫请求单 元,用于当所述业务控制信道不可用时, 向 MSC服务器发送 CS呼叫请求, 所述 CS呼叫请求中包含会话对端的地址信息, 以建立新的 CS承载控制信 道; 或者接收呼叫请求及挂起单元, 用于当所述业务控制信道不可用时, 接收 MSC服务器转发的 IMS呼叫请求, 所述 IMS呼叫请求由 AS服务器 发送, 所述 IMS域呼叫请求中包含呼叫的会话对端的地址信息, 根据所述 会话对端的地址信息挂起所述呼叫请求, 以建立新的 CS承载控制信道。 所 述业务控制信令交互单元 1020具体用于当所述业务控制信道不可用时, 通 过所述新的 CS承载控制信道进行所述 IMS会话的业务控制信令的交互。
CS承载控制信道包括会话终端与 MSC服务器之间的 CS域部分,以及 MSC服务器与应用服务器 AS之间的 IMS域部分, 进一步, 该会话终端还 可以包括(图 10中未示出 ): 发送保持请求单元, 用于向 MSC服务器发送 保持请求,所述保持请求中携带 TI值, 以使 MSC向所述 AS发送携带所述 TI值的邀请消息, 以建立与所述 TI值对应的 IMS域信道, 所述 AS用于将 所述 IMS域信道与所述 TI值对应的 IMS会话对端关联; 所述业务控制信 令交互单元 1020具体用于当所述业务控制信道不可用时, 通过已存在的 CS承载控制信道的 CS域部分与所述 TI值对应的 IMS域信道进行所述 TI 值对应的 IMS会话的业务控制信令的交互。
通过以上的实施方式的描述可知, 本发明实施例中服务器和属于一个 会话终端的至少两个 IMS会话关联, IMS会话通过 PS域网络的业务控制 信道传输业务控制信令, 当业务控制信道不可用时,通过 CS承载控制信道 传输 IMS会话的业务控制信令。 应用本发明实施例可以在业务控制信道不 可用, 无法传输控制信令从而导致会话业务, 特别是保持状态会话业务失 败的情况下, 能够恢复对多个会话的控制, 保证了会话业务的畅通, 使用 户会话不会丢失, 从而提高了用户体验。 本领域的技术人员可以清楚地了解到本发明可借助软件加必需的通用 硬件平台的方式来实现。 基于这样的理解, 本发明的技术方案本质上或者 说对现有技术做出贡献的部分可以以软件产品的形式体现出来, 该计算机 软件产品可以存储在存储介质中, 如 ROM/RAM、 磁碟、 光盘等, 包括若 干指令用以使得一台计算机设备(可以是个人计算机, 服务器, 或者网络 以上所述的本发明实施方式, 并不构成对本发明保护范围的限定。 任 何在本发明的精神和原则之内所作的修改、 等同替换和改进等, 均应包含 在本发明的保护范围之内。

Claims

权利要求
1、 一种实现业务连续性的方法, 其特征在于, 包括:
与属于一个会话终端的至少两个 IP多媒体子系统 IMS会话关联, 所述 IMS ^舌通过分组交换 PS网络的业务控制信道传输业务控制信令;
当所述业务控制信道不可用时,通过电路交换 CS承载控制信道传输所 述 IMS会话的业务控制信令。
2、 根据权利要求 1所述的方法, 其特征在于, 所述业务控制信道不可 用包括:
所述会话终端检测到所述业务控制信道不可用; 或
服务器检测到所述业务控制信道不可用。
3、 根据权利要求 1所述的方法, 其特征在于, 所述通过 CS承载控制 信道传输所述 IMS会话的业务控制信令包括:
新建 CS承载控制信道, 通过所述新建 CS承载控制信道传输所述 IMS 会话的业务控制信令; 或
通过已存在的 CS承载控制信道传输所述至少两个 IMS会话中的一个 IMS会话的业务控制信令, 新建 CS承载控制信道, 通过所述新建 CS承载 控制信道传输除所述一个 IMS会话的剩余 IMS会话的业务控制信令。
4、 根据权利要求 3所述的方法, 其特征在于, 所述新建 CS承载控制 信道包括:
接收会话终端发送的 CS呼叫请求, 所述 CS呼叫请求中包含会话对端 的地址信息;
根据所述 CS呼叫请求向应用服务器 AS发送邀请消息, 所述邀请消息 包含所述会话对端的地址信息, 以使所述 AS根据所述会话对端的地址信 息, 确认所述会话终端和会话对端之间已建立 IMS会话的连接, 向所述会 话对端发送重邀请消息。
5、 根据权利要求 3所述的方法, 其特征在于, 所述新建 CS承载控制 信道包括:
接收 AS发送的 IMS域呼叫请求, 所述 IMS域呼叫请求中包含呼叫的 会话对端的地址信息; 将所述 IMS呼叫请求转发到会话终端, 所述会话终端用于根据所述会 话对端的地址信息挂起所述呼叫请求。
6、 根据权利要求 1所述的方法, 其特征在于, 所述 CS承载控制信道 包括: 会话终端与移动交换中心 MSC服务器之间的 CS域部分, 以及 MSC 服务器与应用服务器 AS之间的 IMS域部分;
所述通过 CS承载控制信道传输所述 IMS会话的业务控制信令包括: 新建 MSC服务器与应用服务器 AS之间的 IMS域信道,通过已存在的 CS承载控制信道的 CS域部分和所述新建的 IMS域信道传输所述 IMS会话 的业务控制信令; 或
通过已存在的 CS承载控制信道传输所述至少两个 IMS会话中的一个 IMS会话的业务控制信令, 新建 MSC服务器与应用服务器 AS之间的 IMS 域信道,通过已存在的 CS承载控制信道的 CS域部分和所述新建的 IMS域 信道传输除所述一个 IMS会话的剩余 IMS会话的业务控制信令。
7、 根据权利要求 6所述的方法, 其特征在于, 所述通过已存在的 CS 承载控制信道的 CS域部分和所述新建的 IMS域信道传输除所述一个 IMS 会话的剩余 IMS会话的业务控制信令包括:
为所述剩余 IMS会话分别建立 IMS域信道。
8、 根据权利要求 7所述的方法, 其特征在于, 所述为所述剩余 IMS会 话分别建立 IMS域信道包括:
接收到 AS发送的会话信息, 所述会话信息中包含 STI值;
向所述 AS发送邀请消息, 所述邀请消息中包括所述剩余 IMS会话的 对端, 并将已存在的会话对端连接与新建的 IMS域信道关联。
9、 根据权利要求 7所述的方法, 其特征在于, 所述为所述剩余 IMS会 话分别建立 IMS域信道包括:
接收会话终端发送的保持请求, 所述保持请求中携带 TI值;
向 AS发送邀请消息, 所述邀请消息中携带所述 Ή值, 建立与所述 TI 值对应的 IMS域信道,所述 AS用于才 据所述 TI值将所述 IMS域信道与所 述 TI值对应的 IMS会话对端关联。
10、 根据权利要求 1所述的方法, 其特征在于, 所述通过 CS承载控制 信道传输所述 IMS会话的业务控制信令包括:
复用已存在的 CS承载控制信道传输所述 IMS会话的业务控制信令。
11、根据权利要求 3或 6所述的方法, 其特征在于, 按照下述任意一种 方式选择所述至少两个 IMS会话中的一个 IMS会话:
选择处于激活状态的 IMS会话;
按照 IMS会话的建立顺序选择最早建立的 IMS会话。
12、 一种实现业务连续性的系统, 其特征在于, 包括: 移动交换中心 MSC服务器、 应用服务器 AS,
所述 MSC服务器,用于与属于一个会话终端的至少两个 IMS会话关联, 所述 IMS ^舌通过 PS接入网络的业务控制信道传输业务控制信令,当所述 业务控制信道不可用时, 通过 CS承载控制信道传输所述 IMS会话的业务 控制信令, 所述 CS承载控制信道包括所述会话终端与 MSC服务器之间的 CS域部分, 以及所述 MSC服务器与所述 AS之间的 IMS域部分。
13、 一种 MSC服务器, 其特征在于, 包括:
关联单元, 用于与属于一个会话终端的至少两个 IMS会话关联, 所述 IMS ^舌通过 PS接入网络的业务控制信道传输业务控制信令;
传输单元, 用于当所述业务控制信道不可用时, 通过 CS承载控制信道 传输所述 IMS会话的业务控制信令。
14、根据权利要求 13所述的服务器, 其特征在于, 所述传输单元包括: 第一 CS承载控制信道新建传输单元, 用于新建 CS承载控制信道, 通 过所述新建 CS承载控制信道传输所述 IMS会话的业务控制信令; 或
第二 CS承载控制信道新建传输单元, 用于通过已存在的 CS承载控制 信道传输所述至少两个 IMS会话中的一个 IMS会话的业务控制信令, 新建 CS承载控制信道, 通过所述新建 CS承载控制信道传输除所述一个 IMS会 话的剩余 IMS会话的业务控制信令。
15、 根据权利要求 13所述的服务器, 其特征在于, 所述 CS承载控制 信道包括: 会话终端与移动交换中心 MSC服务器之间的 CS域部分, 以及 MSC服务器与应用服务器 AS之间的 IMS域部分; 所述传输单元包括:
第一 IMS域信道新建传输单元, 用于新建 MSC服务器与应用服务器 AS之间的 IMS域信道, 通过已存在的 CS承载控制信道的 CS域部分和所 述新建的 IMS域信道传输所述 IMS会话的业务控制信令; 或
第二 IMS域信道新建传输单元, 通过已存在的 CS承载控制信道传输 所述至少两个 IMS会话中的一个 IMS会话的业务控制信令, 新建 MSC服 务器与应用服务器 AS之间的 IMS域信道,通过已存在的 CS承载控制信道 的 CS域部分和所述新建的 IMS域信道传输除所述一个 IMS会话的剩余 IMS会话的业务控制信令。
16、根据权利要求 13所述的服务器, 其特征在于, 所述传输单元包括: 复用 CS承载控制信道传输单元, 用于复用已存在的 CS承载控制信道 传输所述 IMS会话的业务控制信令。
17、 一种会话终端, 其特征在于, 包括:
关联单元, 用于将至少两个 IMS会话与 MSC服务器关联, 所述 IMS ^舌通过 PS接入网络的业务控制信道传输业务控制信令;
业务控制信令交互单元, 用于当所述业务控制信道不可用时, 通过 CS 承载控制信道进行所述 IMS会话的业务控制信令的交互。
18、 根据权利要求 17所述的会话终端, 其特征在于, 还包括: 检测单元, 用于检测所述业务控制信道是否可用;
所述业务控制信令交互单元, 具体用于在所述检测单元检测到所述业 务控制信道不可用时, 通过 CS承载控制信道进行所述 IMS会话的业务控 制信令的交互。
19、 根据权利要求 17所述的会话终端, 其特征在于, 还包括: 发送呼叫请求单元, 用于当所述业务控制信道不可用时, 向 MSC服务 器发送 CS呼叫请求, 所述 CS呼叫请求中包含会话对端的地址信息, 以建 立新的 CS承载控制信道; 或
接收呼叫请求及挂起单元, 用于当所述业务控制信道不可用时, 接收 MSC服务器转发的 IMS呼叫请求, 所述 IMS呼叫请求由 AS服务器发送, 所述 IMS域呼叫请求中包含呼叫的会话对端的地址信息, 根据所述会话对 端的地址信息挂起所述呼叫请求, 以建立新的 CS承载控制信道;
所述业务控制信令交互单元具体用于, 当所述业务控制信道不可用时, 通过所述新的 CS承载控制信道进行所述 IMS会话的业务控制信令的交互。
20、 根据权利要求 17所述的会话终端, 其特征在于, 所述 CS承载控 制信道包括会话终端与 MSC服务器之间的 CS域部分, 以及 MSC服务器 与应用服务器 AS之间的 IMS域部分, 所述会话终端还包括:
发送保持请求单元, 用于向 MSC服务器发送保持请求, 所述保持请求 中携带 Ή值, 以使 MSC向所述 AS发送携带所述 Ή值的邀请消息, 以建 立与所述 TI值对应的 IMS域信道,所述 AS用于将所述 IMS域信道与所述 TI值对应的 IMS会话对端关联;
所述业务控制信令交互单元具体用于, 当所述业务控制信道不可用时, 通过已存在的 CS承载控制信道的 CS域部分与所述 TI值对应的 IMS域信 道进行所述 TI值对应的 IMS会话的业务控制信令的交互。
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CN101330748A (zh) * 2007-07-31 2008-12-24 中兴通讯股份有限公司 一种ip多媒体子系统集中业务会话控制路径的切换方法

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CN114640958A (zh) * 2020-12-16 2022-06-17 维沃移动通信有限公司 Ims过程处理方法及相关设备

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