WO2012136092A1 - 振铃态域切换方法及装置 - Google Patents

振铃态域切换方法及装置 Download PDF

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Publication number
WO2012136092A1
WO2012136092A1 PCT/CN2012/072227 CN2012072227W WO2012136092A1 WO 2012136092 A1 WO2012136092 A1 WO 2012136092A1 CN 2012072227 W CN2012072227 W CN 2012072227W WO 2012136092 A1 WO2012136092 A1 WO 2012136092A1
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Prior art keywords
called party
msc
scc
switching
domain
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PCT/CN2012/072227
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English (en)
French (fr)
Inventor
高扬
周蓝粢
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中兴通讯股份有限公司
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Publication of WO2012136092A1 publication Critical patent/WO2012136092A1/zh

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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
    • H04L65/1066—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
    • 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]
    • H04W36/00226—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] wherein the core network technologies comprise IP multimedia system [IMS], e.g. single radio voice call continuity [SRVCC]

Definitions

  • the present invention relates to the field of communications, and in particular to a method and apparatus for switching a ringing state domain.
  • IMS Internet Multimedia Subsystem
  • 3GPP Third Generation Partnership Project
  • SIP Session Initial Protocol
  • multimedia communication has nothing to do with access mode, and can have multiple functions such as separation of multimedia service control functions and bearer capabilities, separation of calls and sessions, separation of applications and services, separation of services from networks, and convergence of mobile networks and Internet services.
  • the Single Radio Voice Call Continuity (SRVCC) scheme enables wireless users to perform IMS and Circuit Switching (CS) in a Single Radio (SR) environment. Voice switching.
  • SRVCC corresponds to the User Equipment (UE) of the SR.
  • the S-UE can only use one of the 2G/3G radio and Long-Term Evolution (LTE) radios at the same time.
  • LTE Long-Term Evolution
  • 3GPP has proposed a standard flow method for switching the calling mode and called mode of the SRVCC ringing state domain.
  • the mobile switching center Mobile Switching Center, hereinafter referred to as MSC
  • MSC Mobile Switching Center
  • SCC AS Single Radio Voice Call Continuity Application Server
  • the UPDATE message is used to update the remote end; after the media negotiation is completed, the SCC AS sends an notification (INFO) message to notify the MSC of the relevant session information, and carries the switching mode; if the calling mode is The called party picks up the call and the SCC AS transparently transmits the 200 OK to the MSC to complete the handover process.
  • INFO notification
  • the MSC sends an INFO message with the response identifier to notify the SCC AS, and the SCC AS determines that the call is in the called mode. If the call is off-hook, a 200 OK message is sent to the caller to complete the handover process.
  • the specific process method is as follows:
  • FIG. 1 is a flowchart of a 3GPP SRVCC ringing state switching calling mode. As shown in FIG. 1 , the ringing state switching step in the calling mode specifically includes:
  • the SRVCC user UE A (the local end) carries a call session description protocol (SDP) in the packet switching (PS) domain to initiate a call to the UE B (remote), and has already Anchored to the SCC AS; UE B replies with the 180 ringing message with the called SDP; the resources at both ends have been negotiated successfully, and the session is in the ringing state.
  • SDP call session description protocol
  • the UE A reports the radio access signal to the Evolved Universal Terrestrial Radio Access Network (E-UTRAN), and the E-UTRAN determines to trigger the SRVCC handover according to the radio access signal.
  • the MSC carries the Session Transfer Number for SRVCC (STN-SR) to initiate the session switching operation; the UE A is in the ringing state.
  • STN-SR Session Transfer Number for SRVCC
  • the MSC initiates an initial INVITE session switch request, and the information carried by the INVITE session switch request includes: a Request-URI and a Media GateWay (MGW) supported SDP, where the resource is requested Identified as STR-SR.
  • the IMS core network IMS Core Network, referred to as IM CN) forwards the INVITE request of the session switch to the SCC AS.
  • SI 04 A SCC AS associates the local end with the remote end. Because the initial resources have been negotiated when the primary and the called are ringing, the SCC AS prepares the remote update operation.
  • the SCC AS sends an UPDATE message to update the remote end.
  • the media SDP indicates that the resource is available.
  • the IM CN forwards the UPDATE message to the terminal UE B.
  • UE B replies with response information (200 OK) and carries terminal media capabilities.
  • IM CN forwards 200 OK to SCC AS.
  • SCC AS sends a call progress with terminal media capability (183 messages).
  • IM CN forwards 183 the message to the MSC.
  • the MSC replies with a confirmation request message (Prack).
  • the IM CN forwards the Prack to the SCC AS. 5113, SCC AS replies to Prack's 200 OK.
  • IM CN forwards 200 OK to MSC.
  • S115 The SCC AS sends an INK) message request, including session related information, where the INK) message request carries an SCC caller handover identifier, and indicates that the SCC AS is ready.
  • the IM CN forwards the INFO message to the MSC; the MSC receives the INFO message, and determines, according to the content of the message, the calling ring state domain switching.
  • the MSC replies to the INFO response message 200 OK.
  • IM CN forwards 200 ⁇ (INFO) messages.
  • the MSC When the MSC receives the INK message carrying the session related information, the MSC enters a call delivery state.
  • the called user UE B picks up the phone and sends a message of 200 OK0NVITE), carrying the SDP of the called user.
  • the IM CN forwards the response response message to the SCC AS.
  • the SCC AS removes the called media SDP and forwards the 200 OK message of the called off-hook response.
  • the IM CN forwards the response response message to the MSC. S124.
  • the MSC informs the UE A (CS) that the remote called user has picked up the call by CS Connect.
  • UE A replies to the CS Connect Ack message.
  • the MSC replies with an acknowledgement character (ACK) character (ACK).
  • ACK acknowledgement character
  • IM CN forwards the ACK message to the SCC AS.
  • the SCC AS forwards the ACK message.
  • the IM CN forwards the ACK message to UE B.
  • FIG. 2 is a flowchart of a 3GPP SRVCC ringing state switching called mode. As shown in FIG. 2, the ringing state switching step in the called mode specifically includes:
  • UE B (remote) carries the calling SDP to initiate a call to the SRVCC user UE A (the local end) in the PS domain, and UE A has been anchored to the SCC AS; UE A replies with the 180 ringing with the called SDP The message has been negotiated successfully. The session is ringing.
  • the UE A reports the radio access signal to the E-UTRAN, and the E-UTRAN determines to trigger the SRVCC handover to the CS domain according to the radio access signal; the MSC carries the STN-SR to initiate a session switching operation; the UE A is always in the ringing state.
  • the MSC initiates an initial INVITE session switching request, and carries the Request-URI as an STN-SR and an SDP supported by the MGW.
  • the IM CN forwards the INVITE request of the session switch to the SCC AS.
  • the SCC AS associates the local end with the remote end. Because the initial resource has been negotiated when the primary and the called party are ringing, the SCC AS prepares the remote update operation.
  • S205 The SCC AS sends an UPDATE message to update the remote end.
  • the media SDP indicates that the resource is available.
  • the IM CN forwards the UPDATE message to the terminal UE B.
  • UE B replies with 200 OK and carries terminal media capabilities.
  • IM CN forwards 200 OK to SCC AS.
  • the SCC AS sends a 183 message with terminal media capability.
  • IM CN forwards 183 the message to the MSC.
  • S211 the MSC replies to Prack.
  • IM CN forwards Prack to SCC AS.
  • the SCC AS sends an INFO message request, including session related information, carries the SCC called handover identifier, and the state is ready.
  • the IM CN forwards the INFO message to the MSC.
  • the MSC receives the INFO message, and determines, according to the content of the message, the called ringing state domain switch.
  • the MSC replies to the INFO response message 200 OK.
  • IM CN forwards 200 ⁇ (INFO) messages. S219.
  • the MSC receives the INFO message carrying the session related information, the MSC enters a call delivery state.
  • the called user UE A answers the number in the CS domain.
  • UE A sends a CS Connect notification MSC.
  • the MSC receives the CS Connect message of the called user after the CS is off-hook, and sends an INFO message with the response session information to the IM CN.
  • the IM CN forwards the INFO message with the response information to the SCC AS.
  • the SCC AS replies to the response of the INFO 200 OK message.
  • IM CN forwards the 200 OK (INFO) message to the MSC.
  • the SCC AS receives the INFO message, and determines that the called party has picked up the answer, and sends a 200 OK message of the off-hook response carrying the fake media SDP.
  • the IM CN forwards the response response message to the calling user UE B.
  • the calling user UE B replies with an ACK.
  • IM CN forwards the ACK to the SCC AS.
  • the SCC AS sends a 200 OK (INVITE) response message to inform the MSC that the handover is successful.
  • the IM CN forwards the 200 OK (INVITE) message to the MSC.
  • the MSC sends a CS Connect Ack message to UE A, indicating that the handover is successful.
  • the MSC replies with an ACK message.
  • IM CN forwards the ACK to the SCC AS.
  • S234-S241 SCC AS Send Cancel (CANCEL) Releases the call that was originally called in the PS domain.
  • the session request/response (offer/answer) negotiation must be successful before the handover, otherwise the SCC AS receives the ringing state domain handover.
  • the remote (UPDATE) message cannot be used to update the remote end, and the domain switching process cannot be completed.
  • a ringing domain switching method comprising: receiving, during a ringing state handover process between a calling party and a called party, an SCC AS receiving an originating session switching request from an MSC;
  • the SCC AS determines that the response message of the called party does not carry the SDP information of the called party when the initial session is established in the ringing state; the SCC information is forged by the SCC AS, and the SDP information of the forged party is forged
  • the MSC sends the MSC to the MSC; the MSC continues to complete the subsequent process of the ringing state switching according to the forged SDP information of the called party.
  • the method includes: the calling party initiates a call request carrying the SDP information of the calling party to the called party in the packet switched PS domain; the called party replies that the called party does not carry the called party The response message of the SDP information of the party, the session is in a ringing state; the local end reports the radio access signal to the evolved universal mobile communication system terrestrial radio access network E-UTRAN, wherein the local end is the calling party or the called party; The E-UTRAN triggers the circuit switched CS domain according to the radio access signal, and the MSC in the E-UTRAN initiates a session switch request to the SCC AS in the CS domain.
  • the method includes: the SCC AS does not initiate the update to the remote end, where If the local end is the calling party, the remote end is the called party. If the local end is the called party, the remote end is the called party.
  • the subsequent process of the method includes: after the called party picks up the call, the SCC AS initiates a session invitation message to the remote end, and performs an empty handover procedure to obtain the media capability of the remote end.
  • the method further comprises: the SCC AS releasing the call in the PS domain between the calling party and the called party.
  • the MSC continues to complete the ringing state domain switching according to the spoofed SDP information of the called party, and the MSC performs information exchange with the SCC AS according to the forged SDP information of the called party, and determines the ringing according to the result of the information exchange.
  • the domain switching mode is the active mode or the passive mode; the MSC performs the corresponding mode to perform the ringing domain switching according to the result of the judgment.
  • the ringing domain switching mode is an active mode, and the MSC performs the corresponding mode to perform the ringing domain switching according to the result of the determining, where the MSC receives the response message sent by the SCC AS after the called party picks up the call; the MSC sends the response message to the calling party. Send a CS domain connection from the message, notifying the calling party that the called party has picked up the call.
  • the ringing domain switching mode is a passive mode, and the MSC performs the corresponding mode for performing the ringing domain switching according to the result of the determining.
  • the MSC receives the CS domain connection slave message sent by the called party when the called party answers the off-hook; the MSC notifies the SCC AS.
  • the called party has picked up the call and the SCC AS determines that the called party has picked up the call and sends the fake SDP information of the called party to the calling party.
  • the calling party sends a reply message to the MSC through the SCC AS to inform the MSC that the handover is successful.
  • a ringing state domain switching apparatus which is located at an SCC AS, and includes: a receiving module, configured to receive a ringing domain switching process between a calling party and a called party, and receive the MSC from the MSC Initiating a session switching request; the determining module is configured to determine that the SDP information of the called party is not carried in the response message of the called party when the initial session is established in the ringing state; the processing module is set to forge the SDP of the called party The sending module is configured to send the spoofed SDP information of the called party to the MSC, so that the MSC continues to complete the subsequent process of the ringing state switching according to the spoofed SDP information of the called party.
  • the apparatus further includes: a switching module, configured to: after the called party picks up the call, initiate a session invitation message to the remote end, and perform an empty handover procedure to obtain the media capability of the remote end, where if the ringing state domain The handover process is initiated by the calling party, and the remote end is the called party. If the ringing state domain handover process is initiated by the called party, the remote party is the calling party.
  • the apparatus further comprises: a release module, configured to release the call in the PS domain between the calling party and the called party after the switching module acquires the media capability of the remote end.
  • the SCC AS solves the problem that the session negotiation between the local user and the remote user is unsuccessful before the ringing state is switched by constructing a message carrying the SDP information of the forged party.
  • the problem of the switching process cannot be completed, and the ringing state switching process can be successfully completed in the case where the local end user and the remote user session are unsuccessful in the calling mode or the called mode.
  • FIG. 1 is a flowchart of a 3GPP SRVCC ringing state switching calling mode according to the related art
  • FIG. 2 is a flowchart of a 3GPP SRVCC ringing state switching called mode according to the related art
  • 3 is a flowchart of a ringing state domain switching method according to an embodiment of the present invention
  • FIG. 4 is a flow chart of a Fake SDP SRVCC ringing state switching calling mode according to a preferred embodiment of the present invention
  • FIG. 5 is a preferred implementation according to the present invention.
  • FIG. 6 is a schematic diagram of a ringing state domain switching device according to an embodiment of the present invention.
  • FIG. 3 is a flowchart of a method for switching a ringing state according to an embodiment of the present invention. As shown in FIG. 3, in the ringing state switching process between a calling party and a called party, the method mainly includes the following steps: Step S302, the SCC AS receives an originating session handover request from the MSC.
  • the calling party when the calling party initiates a call request to the called party, the calling party first anchors to the SCC AS regardless of whether the called party replies with a ringing message carrying the protected called party SDP information.
  • the session request status is in the ringing state.
  • the calling party initiates a call request to the called party to carry the SDP information of the calling party in the PS domain, and the called party replies with a response message that does not carry the SDP information of the called party, and the session is in a ringing state.
  • the MSC initiates an initial invitation session switching request.
  • a forwarding device may be set, so that the forwarding device can forward information between the MSC and the SCC AS.
  • the forwarding device can also be used to forward information between the calling party, the called party, the MSC, and the SCC AS. Therefore, in the case that the forwarding device is set, the initial invitation session switching request initiated by the MSC may be forwarded to the SCC AS by the forwarding device.
  • the local end reports the radio access signal to the evolved universal mobile communication system terrestrial radio access network E-UTRAN, where the local end is the calling party or the called party, and the E-UTRAN triggers the circuit switched CS domain according to the radio access signal.
  • the MSC in the E-UTRAN initiates a session switch request to the SCC AS in the CS domain.
  • Step S304 The SCC AS determines that the response message of the called party does not carry the session description protocol SDP information of the called party when the initial session establishment is in the ringing state.
  • the SCC AS accepts the response message of the called party reply, directly determines whether there is part of the SDP information in the response message, and determines and determines the response of the called party reply in the SCC AS.
  • the SCC AS does not initiate the update to the remote end. If the local end is the calling party, the remote end is the called party. If the local end is the called party, the far end is The terminal is the calling party.
  • Step S306 the SCC AS forges the SDP information of the called party, and sends the forged SDP information of the called party to the MSC.
  • the SCC AS merely falsifies a response information, and the response information does not actually have the SDP information of the called party, and the SCC AS sends the forged SDP information of the called party to The MSC completes the initial offer/answer negotiation of the local end.
  • Step S308 the MSC continues to complete the subsequent process of ringing state domain switching according to the forged SDP information of the called party.
  • the MSC after receiving the spoofed SDP information of the called party, the MSC exchanges information with the SCC AS according to the forged SDP information of the called party, and determines that the ringing domain switching mode is based on the result of the information exchange.
  • the active mode is still the passive mode, and then the corresponding mode is performed according to the result of the judgment to perform the ringing domain switching.
  • the MSC receives the response message sent by the SCC AS after the called party picks up the call, the MSC learns that the called party has picked up the call, and then the MSC sends the CS domain connection to the calling party.
  • the MSC sends a response message to the SCC AS, and then notifies the called party through the SCC AS, thereby completing the message.
  • Switch When the ringing domain switching mode is the passive mode, when the called party picks up the call, the MSC receives the CS domain connection slave message sent by the called party when the off-hook responds, and then notifies the SCC AS that the called party has picked up the call, SCC The AS determines that the called party has picked up the call and sends the spoofed SDP information of the called party to the calling party.
  • the calling party sends a reply message to the MSC through the SCC AS to inform the MSC that the handover is successful.
  • the SCC AS initiates a session invitation message to the remote end to perform an empty handover process to obtain the media capability of the remote end.
  • the SCC AS releases the calling party.
  • the call between the party and the called party in the PS domain can save network resources. Referring to FIG. 3 and the foregoing embodiment, the ringing domain switching process of the active mode and the passive mode will be described with reference to FIG. 4 and FIG. 5 respectively.
  • 4 is a flow chart of a Fake SDP SRVCC ringing state switching calling mode according to a preferred embodiment of the present invention. As shown in FIG. 4, the entire calling handover process is performed according to the following steps:
  • the SRVCC user UE A carries the calling SDP in the PS domain to initiate a call to the UE B, and has been anchored to the SCC AS; the UE B replies to the 180 ringing message without the called SDP; the session is in a ringing state.
  • UE A reports a radio access signal to the E-UTRAN, and the E-UTRAN determines to trigger the SRVCC handover to the CS domain according to the radio access signal; the MSC carries the STN-SR to initiate a session handover operation; UE A is always in a ringing state.
  • the MSC initiates an initial INVITE session switching request, and carries a Request-URI as an STN-SR and an SDP supported by the MGW.
  • the IM CN forwards the INVITE request of the session switch to the SCC AS.
  • the SCC AS associates the local end with the remote end. Because the initial resources are not negotiated when the primary and secondary parties are ringing, the SCC AS ignores the update operation to the remote end.
  • the SCC AS sends a 183 message carrying the fake answer media to the IM CN; the fake answer media indicates that the resource is available.
  • the IM CN forwards the 183 message with the fake answer media to the MSC.
  • S409 SCC AS replies to Prack's 200OK.
  • S410 IM CN forwards 200 OK to the MSC.
  • the SCC AS sends an INK) message request, including session related information, where the INK) message request carries an SCC caller handover identifier, and indicates that the SCC AS is ready.
  • the IM CN forwards the INFO message to the MSC.
  • the MSC receives the INFO message, and determines the calling ring state domain switching according to the content of the message.
  • S413, the MSC replies to the INFO response message 200OK.
  • IM CN forwards 200 ⁇ (INFO) message.
  • the MSC When the MSC receives the INFO message carrying the session related information, the MSC enters a call delivery state.
  • the called user UE B picks up the phone and sends a message of 200 OK0NVITE), carrying the SDP of the called user.
  • the IM CN forwards the response response message to the SCC AS.
  • the SCC AS removes the called media SDP, and forwards the 200 OK message of the called off-hook response.
  • the IM CN forwards the response response message to the MSC.
  • the MSC informs the UE A (CS) that the remote called user has picked up the call by CS Connect.
  • UE A replies to the CS Connect Ack message.
  • S422 the MSC replies with an ACK message.
  • IM CN forwards the ACK message to the SCC AS.
  • the SCC AS forwards the ACK message.
  • the IM CN forwards the ACK message to UE B.
  • S426 The SCC AS initiates a re-invite message without the media SDP, and initiates an aircut process to the remote called user.
  • the IM CN forwards the null-cut Re-invite request message to the remote terminal UE B.
  • S430-S433 the SCC AS sends 404 to release the call originated by the original caller from the PS.
  • 5 is a flow chart of a Fake SDP SRVCC ringing state switching called mode according to a preferred embodiment of the present invention; as shown in FIG. 5, the entire called switching process is performed as follows:
  • UE B carries the calling SDP to initiate a call to the SRVCC user UE A in the PS domain, and UE A has been anchored to the SCC AS; UE A replies with the 180 ringing message without the called SDP; the session is ringing status.
  • the UE A reports the radio access signal to the E-UTRAN, and the E-UTRAN determines to trigger the SRVCC handover to the CS domain according to the radio access signal; the MSC carries the STN-SR to initiate a session handover operation; the UE A is directly in the ringing state.
  • the MSC initiates an initial INVITE session switching request, and carries the Request-URI as an STN-SR and an SDP supported by the MGW.
  • the IM CN forwards the INVITE request of the session switch to the SCC AS.
  • S504A the SCC AS associates the local end with the remote end. Because the initial resources are not negotiated when the primary and secondary parties are ringing, the SCC AS ignores the update operation to the remote end.
  • the SCC AS sends a 183 message carrying the fake answer media to the IM CN.
  • the fake answer media indicates that the resource is available.
  • the IM CN forwards the 183 message with the fake answer media to the MSC.
  • IM CN forwards Prack to SCC AS.
  • the IM CN forwards 200 OK to the MSC.
  • S511 The SCC AS sends an INK) message request, including session related information, where the INK) message request carries an SCC called handover identifier, and indicates that the SCC AS is ready.
  • the IM CN forwards the INFO message to the MSC.
  • the MSC receives the INFO message, and determines that the called ringing state is switched according to the content of the message.
  • the MSC replies to the INFO response message 200 OK.
  • IM CN forwards 200 ⁇ (INFO) message.
  • the MSC When the MSC receives the INFO message carrying the session related information, the MSC enters a call delivery state.
  • the called user UE A answers the number in the CS domain.
  • UE A sends a CS Connect notification MSC. S517. After receiving the CS Connect message of the called user on the off-hook of the CS, the MSC sends an INFO message with the response session information to the IM CN.
  • the IM CN forwards the INFO message with the response information to the SCC AS.
  • IM CN forwards the 200 OK (INFO) message to the MSC.
  • S521 The SCC AS receives the INFO message, and determines that the called party has an off-hook response, and sends a 200 OK message of the off-hook response carrying the fake media SDP.
  • the IM CN forwards the response response message to the calling user UE B.
  • the SCC AS sends a 200 OK (INVITE) response message to inform the MSC that the handover is successful.
  • INVITE 200 OK
  • IM CN forwards the 200 OK (INVITE) message to the MSC.
  • the MSC sends a CS Connect ACK message to UE A, indicating that the handover is successful.
  • the MSC replies with an ACK message.
  • IM CN forwards the ACK to the SCC AS.
  • S530 The SCC AS initiates a Re-invite message without the media SDP, and initiates an aircut process to the remote called user.
  • the IM CN forwards the null-cut Re-invite request message to the remote terminal UE B.
  • FIG. 6 is a schematic diagram of a ringing state domain switching device according to an embodiment of the present invention. The device is located in an SCC AS, and may be used to implement the foregoing method provided by the embodiments of the present invention. As shown in FIG.
  • the apparatus mainly includes: a receiving module 10 configured to receive an initiating session switching request from an MSC during a ringing state handover process between a calling party and a called party; and the determining module 20 is configured to determine When the initial session is established in the ringing state, the response message replied by the called party does not carry the SDP information of the called party; the processing module 30 is configured to forge the SDP information of the called party; and the sending module 40 is configured to be forged.
  • the SDP information of the called party is sent to the MSC, so that the MSC continues to complete the subsequent process of ringing state switching according to the forged SDP information of the called party.
  • the device may further include: a switching module 50, configured to: after the called party picks up the call, initiate a session invitation message to the remote end, and perform an empty handover procedure to obtain the remote end The media capability, wherein if the ringing state domain switching process is initiated by the calling party, the far end is the called party. If the ringing state domain switching process is initiated by the called party, the remote party is the calling party.
  • the apparatus may further include: a releasing module 60, configured to release the calling party after the switching module acquires the remote media capability A call between the called parties in the PS domain.
  • the SCC AS determines that the initial session establishment is in a ringing state, and the session offer/answer state is not successfully negotiated
  • the SCC AS does not update the remote end, but constructs A message carrying the SDP information of the forged party is sent to the MSC to complete the offer/answer negotiation of the local end.
  • the SCC AS initiates a new session invitation message to the remote end to perform the null handover.
  • the problem of the handover process cannot be completed if the session negotiation between the local user and the remote user is unsuccessful before the ringing state domain switching is completed.
  • the above modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device, such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein.

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  • Mobile Radio Communication Systems (AREA)

Description

振铃态域切换方法及装置 技术领域 本发明涉及通信领域， 具体而言， 涉及一种振铃态域切换方法及装置。 背景技术 网际协议多媒体子系统（IP Multimedia Subsystem, 简称为 IMS)是未来多媒体通 信的发展方向，也是下一代网络最为重要的组成部分。它是第三代合作伙伴计划（Third Generation Partnership Project, 简称为 3GPP)提出的支持 IP多媒体业务的子系统， 其 显著特征是采用了会话初始协议 （Session Initial Protocol, 简称为 SIP) 体系， 在该体 系下， 多媒体通信与接入方式无关， 而且可以具有多媒体业务控制功能与承载能力分 离、 呼叫与会话分离、 应用与服务分离、 业务与网络分离， 以及移动网与因特网业务 融合等多种能力。 单射频语音连续性（Single Radio Voice Call Continuity, 简称为 SRVCC)方案能够 实现无线用户在单射频 （Single Radio, 简称为 SR) 的环境下进行 IMS 与电路交换 (Circuit Switching, 简称为 CS)之间的语音切换。 SRVCC对应 SR的用户设备（User Equipment, 简称为 UE)， S卩 UE 只能在同一时间使用 2G/3G 的射频、 长期演进 (Long-Term Evolution, 简称为 LTE)的射频中的一种， SR的需求是终端厂商提出的， 其目的是复用 2G/3G、 LTE网络的射频和相关电路。
3GPP分别提出了 SRVCC振铃态域切换主叫模式和被叫模式的标准流程方法。在 该方法中， 移动交换中心 （Mobile Switching Center, 简称为 MSC)代替 UE发起振铃 态域切换的操作请求， 单射频语音连续性应用服务器 （Single Radio Voice Call Continuity Application Server, 简称为 SCC AS ) 接收到域切换操作请求时， 使用更新 (UPDATE) 消息去更新远端； 媒体协商完成后， SCC AS发送通知 （INFO) 消息通 知 MSC相关会话信息， 并携带切换模式； 若为主叫模式， 则被叫摘机应答， SCC AS 将 200OK透传给 MSC， 完成切换过程； 若为被叫模式， 则被叫 CS号码摘机时， MSC 发送带应答标识的 INFO消息通知 SCC AS， SCC AS判断被叫已经摘机应答， 则发送 200OK消息给主叫， 完成切换过程。 具体的流程方法如下：
3GPP SRVCC振铃态域切换主叫模式流程 （请参考图 1 ): 图 1表示 3GPP SRVCC振铃态域切换主叫模式流程图， 如图 1所示， 该主叫模式 下的在振铃态域切换步骤具体包括：
5101 , SRVCC用户 UE A (本端）在分组交换 （Packet Switching, 简称为 PS) 域 中携带主叫会话描述协议（Session Description Protocol, 简称为 SDP)发起呼叫到 UE B (远端）， 且已经锚定到 SCC AS; UE B回复带被叫 SDP的 180振铃消息； 两端资 源已经协商成功， 此会话处于振铃状态。
5102 , UE A 上报无线接入信号给演进的通用移动通信系统陆地无线接入网 (Evolved Universal Terrestrial Radio Access Network, 简称为 E-UTRAN), E-UTRAN 根据无线接入信号决定触发 SRVCC 移交 （Handover) 至 CS域； MSC携带 SRVCC 的会话切换号码 （Session Transfer Number for SRVCC, 简称为 STN-SR) 发起会话切 换操作； UE A—直处于振铃状态。
5103 , MSC发起初始邀请（INVITE)会话切换请求， 且 INVITE会话切换请求携 带的信息包括： 请求资源标识 （Request-URI) 和媒体网关 （Media GateWay, 简称为 MGW) 支持的 SDP， 其中， 请求资源标识为 STR-SR。 S104, IMS核心网 （IMS Core Network, 简称为 IM CN)转发会话切换的 INVITE 请求至 SCC AS。
SI 04 A, SCC AS将本端与远端进行关联， 因之前主被叫振铃状态时初始资源已经 协商好， 故 SCC AS准备对远端的更新操作。
S105, SCC AS发送 UPDATE消息去更新远端； 此段媒体 SDP表示资源可用。 S106, IM CN转发此条 UPDATE消息给终端 UE B。
5107, UE B回复响应信息 （200OK), 并携带终端媒体能力。
5108, IM CN转发 200OK给 SCC AS。
5109, SCC AS发送带终端媒体能力的通话进展 （183消息）。
5110, IM CN转发 183消息给 MSC。 Sill , MSC回复确认请求消息 （Prack)。
S112, IM CN转发 Prack至 SCC AS。 5113 , SCC AS回复 Prack的 200OK。
5114, IM CN转发 200OK至 MSC。
S115， SCC AS发送 INK)消息请求， 包括会话相关信息， 该 INK)消息请求中携 带 SCC主叫切换标识， 且指示 SCC AS已经准备妥当。 S116, IM CN转发此 INFO消息给 MSC; MSC接收到 INFO消息， 根据消息内容 判断出为主叫振铃态域切换。
5117, MSC回复 INFO的响应消息 200OK。
5118, IM CN转发 200ΟΚ (INFO) 消息。
5119, MSC接收到携带会话相关信息的 INK)消息时， 进入呼叫传递状态 （Call delivered state )。
5120,被叫用户 UE B摘机应答，发送 200OK0NVITE)消息，携带被叫用户的 SDP。
5121 , IM CN转发应答响应消息给 SCC AS。
5122, SCC AS卸掉被叫媒体 SDP， 转发被叫摘机应答的 200OK消息。
5123 , IM CN转发应答响应消息给 MSC。 S124, MSC通过 CS Connect从消息告知 UE A(CS)远端被叫用户已经摘机应答。
5125, UE A(CS)回复 CS Connect Ack消息。
5126, MSC回复确认字符 （ACKnowledge Character, 简称为 ACK) 消息。
5127, IM CN转发 ACK消息至 SCC AS。
5128, SCC AS转发 ACK消息。 S129, IM CN转发 ACK消息至 UE B。
S130- S133 , SCC AS发送 404释放原来主叫从 PS发起的那路呼叫。 3GPP SRVCC振铃态域切换被叫模式流程： （请参考图 2) 图 2表示 3GPP SRVCC振铃态域切换被叫模式流程图， 如图 2所示， 该被叫模式 下的在振铃态域切换步骤具体包括：
5201 , UE B (远端） 携带主叫 SDP发起呼叫到在 PS域中的 SRVCC用户 UE A (本端）， 且 UE A已经锚定到 SCC AS; UE A回复带被叫 SDP的 180振铃消息； 两 端资源已经协商成功， 此会话处于振铃状态。
5202, UE A上报无线接入信号给 E-UTRAN, E-UTRAN根据无线接入信号决定 触发 SRVCC handover至 CS域； MSC携带 STN-SR发起会话切换操作； UE A一直处 于振铃状态。
5203 , MSC发起初始 INVITE会话切换请求， 且携带 Request-URI为 STN-SR, MGW支持的 SDP。
5204, IM CN转发会话切换的 INVITE请求至 SCC AS。
S204A, SCC AS将本端与远端进行关联， 因之前主被叫振铃状态时初始资源已经 协商好， 故 SCC AS准备对远端的更新操作。
5205, SCC AS发送 UPDATE消息去更新远端； 此段媒体 SDP表示资源可用。 S206, IM CN转发此条 UPDATE消息给终端 UE B。
5207, UE B回复 200OK, 并携带终端媒体能力。
5208, IM CN转发 200OK给 SCC AS。
5209, SCC AS发送带终端媒体能力的 183消息。
5210, IM CN转发 183消息给 MSC。 S211 , MSC回复 Prack。
5212, IM CN转发 Prack至 SCC AS。
5213 , SCC AS回复 Prack的 200OK。
S214, IM CN转发 200OK至 MSC。
S215, SCC AS发送 INFO消息请求， 包括会话相关信息， 携带 SCC被叫切换标 识， 且状态已经准备妥当。 5216, IM CN转发此 INFO消息给 MSC; MSC接收到 INFO消息， 根据消息内容 判断出为被叫振铃态域切换。
5217, MSC回复 INFO的响应消息 200OK。
5218, IM CN转发 200ΟΚ (INFO) 消息。 S219, MSC接收到携带会话相关信息的 INFO消息时， 进入呼叫传递状态 （Call delivered state )。
S220A, 被叫用户 UE A在 CS域的号码摘机应答。
5220, UE A发送 CS Connect通知 MSC。
5221 , MSC接收被叫用户在 CS摘机的 CS Connect消息后， 发送带应答会话信息 的 INFO消息给 IM CN。
5222, IM CN转发此带应答信息的 INFO消息给 SCC AS。 S223， SCC AS回复 INFO的响应 200OK消息。
5224, IM CN转发 200OK (INFO) 消息给 MSC。
5225, SCC AS接收到 INFO消息， 判断出被叫已经摘机应答， 则发送携带假媒体 SDP的摘机应答的 200OK消息。
5226, IM CN转发此应答响应消息给主叫用户 UE B。
5227, 主叫用户 UE B回复 ACK。
5228, IM CN转发 ACK至 SCC AS。
5229, SCC AS发送 200OK (INVITE) 响应消息， 以告知 MSC切换成功。 S230, IM CN转发 200OK (INVITE) 消息至 MSC。
S231， MSC发送 CS Connect Ack消息给 UE A,告知切换成功。
5232, MSC回复 ACK消息。
5233 , IM CN转发 ACK至 SCC AS。 S234- S241 , SCC AS发送取消 （CANCEL) 释放原来被叫在 PS域的那路呼叫。 然而， 对于以上振铃态域切换过程， 不论是主叫模式还是被叫模式， 都必须在切 换之前保证会话的请求 /应答 （offer/answer) 协商成功， 否则 SCC AS接收到振铃态域 切换请求时， 无法使用更新 （UPDATE) 消息去更新远端， 从而无法完成域切换过程。 发明内容 本发明提供一种振铃态域切换方法及装置， 以至少解决上述问题。 根据本发明的一个方面， 提供了一种振铃态域切换方法， 该方法包括： 在主叫方 与被叫方的振铃态域切换过程中， SCC AS接收来自 MSC的发起会话切换请求； SCC AS确定在初始会话建立处于振铃态时，被叫方回复的响应消息中未携带被叫方的 SDP 信息； SCC AS伪造被叫方的 SDP信息， 并将伪造的被叫方的 SDP信息发送给 MSC; MSC根据伪造的被叫方的 SDP信息继续完成振铃态域切换的后续流程。 优选地， 在 SCC AS接收来自 MSC的发起会话切换请求之前， 包括： 主叫方在分 组交换 PS域向被叫方发起携带主叫方的 SDP信息的呼叫请求； 被叫方回复未携带被 叫方的 SDP信息的响应消息， 会话处于振铃状态； 本端向演进的通用移动通信系统陆 地无线接入网 E-UTRAN上报无线接入信号，其中，本端为主叫方或被叫方； E-UTRAN 根据无线接入信号触发电路交换 CS域， E-UTRAN中的 MSC在 CS域向 SCC AS发起 会话切换请求。 优选地， 在 SCC AS确定在初始会话建立处于振铃状态时， 被叫方回复的响应消 息中未携带被叫方的 SDP信息之后， 包括： SCC AS不发起对远端的更新， 其中， 如 果本端为主叫方， 则远端为被叫方， 如果本端为被叫方， 则远端为主叫方。 优选地， 该方法的后续流程包括： 在被叫方摘机应答后， SCC AS发起会话邀请 消息至远端， 进行空切换流程， 以获取远端的媒体能力。 优选地， 在获取远端的媒体能力之后， 该方法还包括： SCC AS释放主叫方与被 叫方之间的在 PS域的呼叫。 优选地， MSC根据伪造的被叫方的 SDP信息继续完成振铃态域切换的后续流程 包括： MSC根据伪造的被叫方的 SDP信息与 SCC AS进行信息交流，根据信息交流的 结果判断振铃域切换模式是主动模式还是被动模式； MSC根据判断的结果执行相应的 方式进行振铃域切换。 优选地， 振铃域切换模式为主动模式， MSC根据判断的结果执行相应的方式进行 振铃域切换包括： MSC接收 SCC AS在被叫方摘机应答后发送的响应消息； MSC向 主叫方发送 CS域连接从消息， 通知主叫方被叫方已经摘机应答。 优选地， 振铃域切换模式为被动模式， MSC根据判断的结果执行相应的方式进行 振铃域切换包括： MSC接收被叫方在摘机应答时发送的 CS域连接从消息； MSC通知 SCC AS被叫方已摘机应答； SCC AS判断被叫方已经摘机应答， 发送伪造的被叫方的 SDP信息给主叫方；主叫方通过 SCC AS向 MSC发送回复消息，告知 MSC切换成功。 根据本发明的另一方面， 提供了一种振铃态域切换装置， 位于 SCC AS, 包括： 接收模块， 设置为在主叫方与被叫方的振铃态域切换过程中， 接收来自 MSC 的发起 会话切换请求； 确定模块， 设置为确定在初始会话建立处于振铃态时， 被叫方回复的 响应消息中未携带被叫方的 SDP信息； 处理模块， 设置为伪造被叫方的 SDP信息； 发送模块， 设置为将伪造的被叫方的 SDP信息发送给 MSC， 以使 MSC根据伪造的被 叫方的 SDP信息继续完成振铃态域切换的后续流程。 优选地， 该装置还包括： 切换模块， 设置为在被叫方摘机应答后， 发起会话邀请 消息至远端， 进行空切换流程， 以获取远端的媒体能力， 其中， 如果振铃态域切换过 程由主叫方发起， 则远端为被叫方， 如果振铃态域切换过程由被叫方发起， 则远端为 主叫方。 优选地， 该装置还包括： 释放模块， 设置为在切换模块获取到远端的媒体能力之 后， 释放主叫方与被叫方之间的在 PS域的呼叫。 通过本发明， SCC AS通过构造一个携带伪造的被叫方的 SDP信息的消息的方式， 解决了振铃态域切换之前， 如果本端用户与远端用户之间会话协商未成功的情况下就 不能完成切换过程的问题， 进而达到了保证无论是主叫模式还是被叫模式下， 在本端 用户与远端用户会话协商不成功的情况仍能够顺利完成振铃态域切换过程。 附图说明 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， 本发 明的示意性实施例及其说明用于解释本发明， 并不构成对本发明的不当限定。 在附图 中： 图 1是根据相关技术的 3GPP SRVCC振铃态域切换主叫模式流程图； 图 2是根据相关技术的 3GPP SRVCC振铃态域切换被叫模式流程图； 图 3是根据本发明实施例的振铃态域切换方法流程图； 图 4是根据本发明优选实施例的 Fake SDP SRVCC振铃态域切换主叫模式流程图； 图 5是根据本发明优选实施例的 Fake SDP SRVCC振铃态域切换被叫模式流程图； 图 6是根据本发明实施例的振铃态域切换装置示意图。 具体实施方式 下文中将参考附图并结合实施例来详细说明本发明。 需要说明的是， 在不冲突的 情况下， 本申请中的实施例及实施例中的特征可以相互组合。 图 3是根据本发明实施例的振铃态域切换方法流程图， 如图 3所示， 在主叫方与 被叫方的振铃态域切换过程中， 该方法主要包括以下几个步骤： 步骤 S302， SCC AS接收来自 MSC的发起会话切换请求。 在本发明的优选实施方式中， 当主叫方向被叫方发起呼叫请求时， 不管被叫方是 否回复携带保护被叫方 SDP信息的振铃消息， 主叫方均会首先锚定到 SCC AS， 同时 使会话请求状态处于振铃状态。 主叫方在 PS域向被叫方发起携带主叫方的 SDP信息 的呼叫请求， 被叫方回复未携带被叫方的 SDP信息的响应消息， 会话处于振铃状态。 具体地， 在主叫方一直保持振铃的状态下， MSC发起初始邀请会话切换请求， 在实际 应用中，可以设置一个转发装置， 以此转发装置可以转发位于 MSC与 SCC AS之间的 信息， 当然也可以用于转发主叫方、 被叫方、 MSC以及 SCC AS之间的信息。 由此， 在设置了该转发装置的情况下， MSC发起的上述初始邀请会话切换请求可以通过该转 发装置转发给 SCC AS。本端向演进的通用移动通信系统陆地无线接入网 E-UTRAN上 报无线接入信号， 其中， 本端为主叫方或被叫方， E-UTRAN根据无线接入信号触发 电路交换 CS域， E-UTRAN中的 MSC在 CS域向 SCC AS发起会话切换请求。 步骤 S304， SCC AS确定在初始会话建立处于振铃态时， 被叫方回复的响应消息 中未携带被叫方的会话描述协议 SDP信息。 在 SCC AS确定在初始会话建立处于振铃状态时， SCC AS接受被叫方回复的响应 消息， 直接判断该响应消息中是否有 SDP信息的部分， 在 SCC AS判断并确定被叫方 回复的响应消息中未携带被叫方的 SDP信息之后， SCC AS不发起对远端的更新， 其 中， 如果本端为主叫方， 则远端为被叫方， 如果本端为被叫方， 则远端为主叫方。 步骤 S306， SCC AS伪造被叫方的 SDP信息， 并将伪造的被叫方的 SDP信息发 送给 MSC。 在本发明的优选实施例中， SCC AS仅仅是伪造了一种响应信息， 而该响应信息 中并不真的具备被叫方的 SDP信息， SCC AS将伪造的被叫方的 SDP信息发送给 MSC， 以完成本端的初始 offer/answer协商。 步骤 S308， MSC根据伪造的被叫方的 SDP信息继续完成振铃态域切换的后续流 程。 在本发明的具体实施方式中， MSC接收到伪造的被叫方的 SDP信息后， 根据伪 造的被叫方的 SDP信息与 SCC AS进行信息交流， 根据信息交流的结果判断振铃域切 换模式是主动模式还是被动模式， 然后根据判断的结果执行相应的方式进行振铃域切 换。 例如， 当振铃域切换模式为主动模式， MSC接收 SCC AS在被叫方摘机应答后发 送的响应消息， MSC获知被叫方已摘机应答， 然后 MSC向主叫方发送 CS域连接从 消息， 通知主叫方被叫方已经摘机应答， MSC在接收到主叫方返回的 CS域连接成功 的响应消息后， 向 SCC AS发送响应消息， 再通过 SCC AS通知被叫方， 从而完成切 换。 当振铃域切换模式为被动模式， 在被叫方摘机应答时， MSC接收被叫方在摘机应 答时发送的 CS域连接从消息， 然后通知 SCC AS被叫方已摘机应答， SCC AS判断被 叫方已经摘机应答， 发送伪造的被叫方的 SDP信息给主叫方， 主叫方通过 SCC AS向 MSC发送回复消息， 告知 MSC切换成功。 在实际应用中， 被叫方摘机应答后， SCC AS发起会话邀请消息至远端， 进行空 切换流程， 以获取远端的媒体能力， 在获取远端的媒体能力之后， SCC AS释放主叫 方与被叫方之间的在 PS域的呼叫， 从而可以节约网络资源。 下面参照图 3及上述实施方式， 结合图 4、 图 5分别对主动模式和被动模式的振 铃域切换流程进行描述。 图 4是根据本发明优选实施例的 Fake SDP SRVCC振铃态域切换主叫模式流程图， 如图 4所示， 整个主叫切换流程按照下列步骤进行：
S401 , SRVCC用户 UE A在 PS域中携带主叫 SDP发起呼叫到 UE B， 且已经锚 定到 SCC AS; UE B回复未带被叫 SDP的 180振铃消息； 此会话处于振铃状态。 5402, UE A上报无线接入信号给 E-UTRAN, E-UTRAN根据无线接入信号决定 触发 SRVCC handover至 CS域； MSC携带 STN-SR发起会话切换操作； UE A一直处 于振铃状态。
5403 , MSC发起初始 INVITE会话切换请求， 且携带 Request-URI为 STN-SR, MGW支持的 SDP。
5404, IM CN转发会话切换的 INVITE请求至 SCC AS。
S404A, SCC AS将本端与远端进行关联， 因之前主被叫振铃状态时初始资源并未 协商好， 故 SCC AS此时忽略对远端的更新操作。
5405, SCC AS发送携带假 answer媒体的 183消息给 IM CN; 此段假 answer媒体 表示资源可用。
5406, IM CN转发此条带假 answer媒体的 183消息给 MSC。
5407, MSC回复 Prack。
S408， IM CN转发 Prack至 SCC AS。
S409， SCC AS回复 Prack的 200OK。 S410, IM CN转发 200OK至 MSC。
S411， SCC AS发送 INK)消息请求， 包括会话相关信息， 该 INK)消息请求中携 带 SCC主叫切换标识， 且指示 SCC AS已经准备妥当。
S412, IM CN转发此 INFO消息给 MSC; MSC接收到 INFO消息， 根据消息内容 判断出为主叫振铃态域切换。 S413 , MSC回复 INFO的响应消息 200OK。
5414, IM CN转发 200ΟΚ (INFO) 消息。
5415, MSC接收到携带会话相关信息的 INFO消息时， 进入呼叫传递状态 （Call delivered state )。
S416，被叫用户 UE B摘机应答，发送 200OK0NVITE)消息，携带被叫用户的 SDP。 S417, IM CN转发应答响应消息给 SCC AS。 S418， SCC AS卸掉被叫媒体 SDP， 转发被叫摘机应答的 200OK消息。
5419, IM CN转发应答响应消息给 MSC。
5420, MSC通过 CS Connect从消息告知 UE A(CS)远端被叫用户已经摘机应答。
5421 , UE A(CS)回复 CS Connect Ack消息。 S422, MSC回复 ACK消息。
5423， IM CN转发 ACK消息至 SCC AS。
5424， SCC AS转发 ACK消息。
5425， IM CN转发 ACK消息至 UE B。
5426, SCC AS发起不带媒体 SDP的 Re-invite消息， 对远端被叫用户发起空切流 程。
5427, IM CN转发此空切 Re-invite请求消息至远端终端 UE B。
5428, 后续空切流程不再叙述。
5429, 空切流程完成后， 至此媒体携带完成， 同时完成了切换流程。
S430- S433 , SCC AS发送 404释放原来主叫从 PS发起的那路呼叫。 图 5是根据本发明优选实施例的 Fake SDP SRVCC振铃态域切换被叫模式流程图； 如图 5所示， 整个被叫切换流程按照下列步骤进行：
5501 , UE B携带主叫 SDP发起呼叫到在 PS域中的 SRVCC用户 UE A， 且 UE A 已经锚定到 SCC AS; UE A回复未带被叫 SDP的 180振铃消息；此会话处于振铃状态。
5502, UE A上报无线接入信号给 E-UTRAN, E-UTRAN根据无线接入信号决定 触发 SRVCC handover至 CS域； MSC携带 STN-SR发起会话切换操作； UE A直处于 振铃状态。
5503 , MSC发起初始 INVITE会话切换请求， 且携带 Request-URI为 STN-SR, MGW支持的 SDP。
5504, IM CN转发会话切换的 INVITE请求至 SCC AS。 S504A, SCC AS将本端与远端进行关联， 因之前主被叫振铃状态时初始资源并未 协商好， 故 SCC AS此时忽略对远端的更新操作。
S505, SCC AS发送携带假 answer媒体的 183消息给 IM CN; 此段假 answer媒体 表示资源可用。 S506, IM CN转发此条带假 answer媒体的 183消息给 MSC。
5507, MSC回复 Prack。
5508, IM CN转发 Prack至 SCC AS。
S509， SCC AS回复 Prack的 200OK。
S510, IM CN转发 200OK至 MSC。 S511， SCC AS发送 INK)消息请求， 包括会话相关信息， 该 INK)消息请求中携 带 SCC被叫切换标识， 且指示 SCC AS已经准备妥当。
5512, IM CN转发此 INFO消息给 MSC; MSC接收到 INFO消息， 根据消息内容 那个判断出为被叫振铃态域切换。
5513 , MSC回复 INFO的响应消息 200OK。 S514, IM CN转发 200ΟΚ (INFO) 消息。
5515, MSC接收到携带会话相关信息的 INFO消息时， 进入呼叫传递状态 （Call delivered state )。
S516A, 被叫用户 UE A在 CS域的号码摘机应答。
5516, UE A发送 CS Connect通知 MSC。 S517, MSC接收被叫用户在 CS摘机的 CS Connect消息后， 发送带应答会话信息 的 INFO消息给 IM CN。
S518， IM CN转发此带应答信息的 INFO消息给 SCC AS。
5519, SCC AS回复 INFO的响应 200OK消息。
5520, IM CN转发 200OK (INFO) 消息给 MSC。 S521 , SCC AS接收到 INFO消息， 判断出被叫已经摘机应答， 则发送携带假媒体 SDP的摘机应答的 200OK消息。
S522, IM CN转发此应答响应消息给主叫用户 UE B。
S523 , 主叫用户 UE B回复 ACK。 S524, IM CN转发 ACK至 SCC AS。
5525, SCC AS发送 200OK (INVITE) 响应消息， 以告知 MSC切换成功。
5526, IM CN转发 200OK (INVITE) 消息至 MSC。
5527, MSC发送 CS Connect ACK消息给 UE A,告知切换成功。
5528, MSC回复 ACK消息。 S529, IM CN转发 ACK至 SCC AS。
S530, SCC AS发起不带媒体 SDP的 Re-invite消息， 对远端被叫用户发起空切流 程。
S531， IM CN转发此空切 Re-invite请求消息至远端终端 UE B。
S532, 后续空切流程不再叙述。 S533 , 空切流程完成后， 至此媒体携带完成， 同时完成了切换流程。
S534- S541 , SCC AS发送 CANCEL释放原来被叫在 PS域的那路呼叫。 通过本发明实施例提供的上述方法， 可以在初始会话建立处于振铃态， 会话 offer/answer状态未成功协商的情况下， 完成振铃态域切换， 从而提高了用户体验。 图 6是根据本发明实施例的振铃态域切换装置示意图， 该装置位于 SCC AS, 可 以用于实现本发明实施例提供的上述方法。 如图 6所示， 该装置主要包括： 接收模块 10， 设置为在主叫方与被叫方的振铃态域切换过程中， 接收来自 MSC 的发起会话切 换请求； 确定模块 20， 设置为确定在初始会话建立处于振铃态时， 被叫方回复的响应 消息中未携带被叫方的 SDP信息； 处理模块 30， 设置为伪造被叫方的 SDP信息； 发 送模块 40，设置为将伪造的被叫方的 SDP信息发送给 MSC， 以使 MSC根据伪造的被 叫方的 SDP信息继续完成振铃态域切换的后续流程。 为了继续完成会话 offer/answer状态的协商， 该装置还可以包括： 切换模块 50， 设置为在被叫方摘机应答后， 发起会话邀请消息至远端， 进行空切换流程， 以获取远 端的媒体能力， 其中， 如果振铃态域切换过程由主叫方发起， 则远端为被叫方， 如果 振铃态域切换过程由被叫方发起， 则远端为主叫方。 在完成振铃态域切换的后续流程后， 为了使 PS 域资源得到充分利用， 该装置还 可以包括： 释放模块 60， 设置为在切换模块获取到远端的媒体能力之后， 释放主叫方 与被叫方之间的在 PS域的呼叫。 从以上的描述中， 可以看出， 在本发明实施例中， SCC AS在确定初始会话建立 处于振铃态， 会话 offer/answer状态未成功协商的情况下， SCC AS不更新远端， 而构 造了一个携带伪造的被叫方的 SDP信息的消息发送给 MSC，以完成本端的 offer/answer 协商， 在被叫摘机应答后， SCC AS再发起新的会话邀请消息至远端， 进行空切换， 从而获取远端的媒体能力， 完成媒体协商， 从而解决了振铃态域切换之前， 如果本端 用户与远端用户之间会话协商未成功的情况下就不能完成切换过程的问题， 进而达到 了保证无论是主叫模式还是被叫模式下， 在本端用户与远端用户会话协商不成功的情 况仍能够顺利完成振铃态域切换过程， 提高了用户体验， 且在切换完成后， 放弃最先 由本端用户与远端用户在 PS域间的呼叫， 从而达到了节省网络资源的效果。 显然， 本领域的技术人员应该明白， 上述的本发明的各模块或各步骤可以用通用 的计算装置来实现， 它们可以集中在单个的计算装置上， 或者分布在多个计算装置所 组成的网络上， 可选地， 它们可以用计算装置可执行的程序代码来实现， 从而， 可以 将它们存储在存储装置中由计算装置来执行， 并且在某些情况下， 可以以不同于此处 的顺序执行所示出或描述的步骤， 或者将它们分别制作成各个集成电路模块， 或者将 它们中的多个模块或步骤制作成单个集成电路模块来实现。 这样， 本发明不限制于任 何特定的硬件和软件结合。 以上所述仅为本发明的优选实施例而已， 并不用于限制本发明， 对于本领域的技 术人员来说， 本发明可以有各种更改和变化。 凡在本发明的精神和原则之内， 所作的 任何修改、 等同替换、 改进等， 均应包含在本发明的保护范围之内。

Claims

权 利 要 求 书
1. 一种振铃态域切换方法， 在主叫方与被叫方的振铃态域切换过程中， 所述方法 包括：
单射频语音连续性应用服务器 SCC AS接收来自移动交换中心 MSC的发起 会话切换请求；
所述 SCC AS确定在初始会话建立处于振铃态时， 所述被叫方回复的响应 消息中未携带所述被叫方的会话描述协议 SDP信息；
所述 SCC AS伪造所述被叫方的 SDP信息，并将伪造的所述被叫方的 SDP 信息发送给所述 MSC;
所述 MSC根据所述伪造的所述被叫方的 SDP信息继续完成所述振铃态域 切换的后续流程。
2. 根据权利要求 1所述的方法，其中，在所述 SCC AS接收来自 MSC的发起会话 切换请求之前， 还包括：
所述主叫方在分组交换 PS域向所述被叫方发起携带所述主叫方的 SDP信 息的呼叫请求；
所述被叫方回复未携带所述被叫方的 SDP信息的响应消息，会话处于振铃 状态；
本端向演进的通用移动通信系统陆地无线接入网 E-UTRAN上报无线接入 信号， 其中， 所述本端为所述主叫方或所述被叫方；
所述 E-UTRAN 根据所述无线接入信号触发电路交换 CS 域， 所述 E-UTRAN中的所述 MSC在所述 CS域向所述 SCC AS发起会话切换请求。
3. 根据权利要求 2所述的方法， 其中， 在所述 SCC AS确定在初始会话建立处于 振铃状态时， 所述被叫方回复的响应消息中未携带所述被叫方的 SDP 信息之 后， 所述 SCC AS不发起对远端的更新， 其中， 如果所述本端为所述主叫方， 则所述远端为所述被叫方， 如果所述本端为所述被叫方， 则所述远端为所述主 叫方。
4. 根据权利要求 3所述的方法， 其中， 所述后续流程包括：
在所述被叫方摘机应答后， 所述 SCC AS发起会话邀请消息至所述远端， 进行空切换流程， 以获取所述远端的媒体能力。
5. 根据权利要求 4所述的方法， 其中， 在获取所述远端的媒体能力之后， 还包括: 所述 SCC AS释放所述主叫方与所述被叫方之间的在 PS域的呼叫。
6. 根据权利要求 1所述的方法， 其中， 所述 MSC根据所述伪造的所述被叫方的 SDP信息继续完成所述振铃态域切换的后续流程包括：
所述 MSC根据所述伪造的所述被叫方的 SDP信息与所述 SCC AS进行信 息交流， 根据所述信息交流的结果判断振铃域切换模式是主动模式还是被动模 式；
所述 MSC根据判断的结果执行相应的方式进行振铃域切换。
7. 根据权利要求 6 所述的方法， 其中， 所述振铃域切换模式为主动模式， 所述 MSC根据判断的结果执行相应的方式进行振铃域切换包括：
所述 MSC接收所述 SCC AS在所述被叫方摘机应答后发送的响应消息； 所述 MSC向所述主叫方发送 CS域连接从消息，通知所述主叫方所述被叫 方已经摘机应答。
8. 根据权利要求 6 所述的方法， 其中， 所述振铃域切换模式为被动模式， 所述 MSC根据判断的结果执行相应的方式进行振铃域切换包括：
所述 MSC接收所述被叫方在摘机应答时发送的 CS域连接从消息； 所述 MSC通知所述 SCC AS所述被叫方已摘机应答；
所述 SCC AS判断所述被叫方已经摘机应答， 发送所述伪造的所述被叫方 的 SDP信息给所述主叫方；
所述主叫方通过所述 SCC AS向所述 MSC发送回复消息， 告知所述 MSC 切换成功。
9. 一种振铃态域切换装置， 位于单射频语音连续性应用服务器 SCC AS, 包括： 接收模块， 设置为在主叫方与被叫方的振铃态域切换过程中， 接收来自移 动交换中心 MSC的发起会话切换请求； 确定模块， 设置为确定在初始会话建立处于振铃态时， 所述被叫方回复的 响应消息中未携带所述被叫方的会话描述协议 SDP信息；
处理模块， 设置为伪造所述被叫方的 SDP信息；
发送模块， 设置为将伪造的所述被叫方的 SDP信息发送给所述 MSC， 以 使所述 MSC根据所述伪造的所述被叫方的 SDP信息继续完成所述振铃态域切 换的后续流程。
10. 根据权利要求 9所述的装置， 其中， 还包括：
切换模块， 设置为在所述被叫方摘机应答后， 发起会话邀请消息至远端， 进行空切换流程， 以获取所述远端的媒体能力， 其中， 如果所述振铃态域切换 过程由所述主叫方发起， 则所述远端为所述被叫方， 如果所述振铃态域切换过 程由所述被叫方发起， 则所述远端为所述主叫方。
11. 根据权利要求 10所述的装置， 其中， 还包括： 释放模块， 设置为在所述切换模块获取到所述远端的媒体能力之后， 释放 所述主叫方与所述被叫方之间的在分组交换 PS域的呼叫。
PCT/CN2012/072227 2011-04-02 2012-03-13 振铃态域切换方法及装置 WO2012136092A1 (zh)

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