CN102131264A

CN102131264A - Ringing state domain switching method and device

Info

Publication number: CN102131264A
Application number: CN2011100833628A
Authority: CN
Inventors: 高扬; 周蓝粢
Original assignee: ZTE Corp
Current assignee: Nanjing Zhongxing Software Co Ltd
Priority date: 2011-04-02
Filing date: 2011-04-02
Publication date: 2011-07-20
Anticipated expiration: 2031-04-02
Also published as: WO2012136092A1; CN102131264B

Abstract

The invention discloses a ringing state domain switching method and a ringing state domain switching device. The method comprises the following steps that: a single radio voice call continuity application server (SCC AS) receives an initiated session switching request from a mobile switching center (MSC) in the process of switching ringing state domains of a calling party and a called party; when the SCC AS determines that the initial session is established in a ringing state, a response message replied by the called party does not carry session description protocol (SDP) information of the called party; the SCC AS fakes the SDP information of the called party and transmits the faked SDP information of the called party to the MSC; and the MSC continuously finishes a subsequent process of ringing state domain switching according to the faked SDP information of the called party. According to the invention, even if session negotiation between a home terminal user and a remote terminal user is failed, the switching process can be successfully finished before the ringing state domain switching.

Description

Ring attitude domain switch method and device

Technical field

The present invention relates to the communications field, in particular to a kind of ring attitude domain switch method and device.

Background technology

Internet protocol multimedia subsystem (IP Multimedia Subsystem abbreviates IMS as) is the developing direction of following multimedia communication, also is the of paramount importance part of next generation network.It is third generation partner program (Third GenerationPartnership Project, abbreviate 3GPP as) subsystem of the support IP multimedia service that proposes, its notable feature is to have adopted session initiation protocol (Session Initial Protocol, abbreviate SIP as) system, under this system, multimedia communication and access way are irrelevant, and can have that the multimedia service controlled function is separated with bearing capacity, calling separates with session, application separates with service, business and network detach, and multiple abilities such as mobile network and internet service fusion.

Injection is voice continuity (Single Radio Voice Call Continuity frequently, abbreviating SRVCC as) scheme can realize that the wireless user is at injection (Single Radio frequently, abbreviate SR as) environment under the voice that carry out between IMS and the circuit switching (Circuit Switching abbreviates CS as) switch.Subscriber equipment (the User Equipment of the corresponding SR of SRVCC, abbreviate UE as), be radio frequency, Long Term Evolution (the Long-Term Evolution that UE can only use 2G/3G at one time, abbreviate LTE as) radio frequency in a kind of, the demand of SR is that manufacturer terminal proposes, and its objective is the radio frequency and the interlock circuit of multiplexing 2G/3G, LTE network.

3GPP has proposed the normal process method of SRVCC ring attitude territory switching caller pattern and called pattern respectively.In the method, (the Mobile Switching Center of mobile switching centre, abbreviate MSC as) replace UE to initiate the operation requests that switch in ring attitude territory, injection is voice continuity application server (Single Radio Voice Call Continuity Application Server frequently, abbreviate SCCAS as) when receiving territory handover operation request, use renewal (UPDATE) message to remove to upgrade far-end; After media negotiation was finished, SCCAS sent notice (INFO) message informing MSC related session information, and carries switch mode; If the caller pattern, then called off-hook is replied, and SCC AS passes through MSC with 200OK, finishes handoff procedure; If when called pattern, then called CS number off-hook, MSC sends the INFO notice SCC AS that band is replied sign, and SCC AS judges that called off-hook replys, and then sends 200OK message to caller, finishes handoff procedure.Concrete flow and method is as follows:

Caller model process (please refer to Fig. 1) is switched in 3GPP SRVCC ring attitude territory:

Fig. 1 represents 3GPP SRVCC ring attitude territory switching caller model process figure, as shown in Figure 1, and specifically comprising under this caller pattern at ring attitude territory switch step:

S101, SRVCC user UE A (local terminal) is at packet switching (Packet Switching, abbreviate PS as) carry caller Session Description Protocol (Session Description Protocol abbreviates SDP as) in the territory and initiate a call to UE B (far-end), and anchored to SCC AS; UE B replys 180 ALERTING messages with called SDP; The two ends resource has been consulted success, and this session is in ringing condition;

S102, UE A reports the wireless access signal to give universal mobile telecommunications system land radio access web (the EvolvedUniversal Terrestrial Radio Access Network of evolution, abbreviate E-UTRAN as), E-UTRAN triggers SRVCC according to the wireless access signal deciding and transfers (Handover) to the CS territory; MSC carries session Handover Number (SessionTransfer Number for SRVCC abbreviates STN-SR as) the initiation session handover operation of SRVCC; UEA is in ringing condition always;

S103, MSC initiate initially to invite (INVITE) session handoff request, and carry request resource sign (Request-URI) and be STR-SR, the SDP that media gateway (Media GateWay abbreviates MGW as) is supported;

S104, the INVITE that IMS core net (IMS Core Network abbreviates IM CN as) is transmitted the session switching asks to SCCAS;

S104A, SCCAS carries out local terminal and far-end related, therefore before during the calling and called ringing condition initial resource consult, so SCCAS prepares the renewal of far-end is operated;

S105, SCC AS sends UPDATE message and removes to upgrade far-end; This section medium SDP represents that resource can use;

S106, IM CN transmit this UPDATE message and give terminal UE B;

S107, UE B replys response message (200OK), and the carried terminal media capability;

S108, IM CN transmits 200OK and gives SCCAS;

S109, SCCAS send the conversation progress (183 message) of tape terminal media capability;

S110, IM CN transmit 183 message and give MSC;

S111, MSC reply and confirm request message (Prack);

S112, IM CN transmits Prack to SCCAS;

S113, SCCAS replys the 200OK of Prack;

S114, IM CN transmits 200OK to MSC;

S115, SCCAS sends the INFO request, comprises session related information, carry the SCC caller and switch sign, and state is ready;

S116, IM CN transmit this INFO and give MSC; MSC receives INFO, judges to switching in caller ring attitude territory according to message content;

S117, MSC replys the response message 200OK of INFO;

S118, IM CN transmits 200OK (INFO) message;

When S119, MSC receive the INFO that carries session related information, enter call-delivery state (Call deliveredstate);

S120, called subscriber UE B off-hook is replied, and sends 200OK (INVITE) message, carries called subscriber's SDP;

S121, IM CN transmits response message and gives SCCAS;

S122, SCCAS lay down called medium SDP, transmit the 200OK message that called off-hook is replied;

S123, IM CN transmits response message and gives MSC;

S124, MSC by CS Connect from message inform UEA (CS) far-end called subscriber off-hook reply;

S125, UEA (CS) reply CS ConnectAck message;

S126, MSC replys acknowledge character (ACKnowledge Character abbreviates ACK as) message;

S127, IM CN transmit ACK message to SCCAS;

S128, SCCAS transmits ACK message;

S129, IM CN transmit ACK message to UE B;

S130-S133, SCCAS send 404 and discharge that road calling that original caller is initiated from PS;

Called model process is switched in 3GPP SRVCC ring attitude territory: (please refer to Fig. 2)

Fig. 2 represents that 3GPP SRVCC ring attitude territory switches called model process figure, as shown in Figure 2, and specifically comprising under this called pattern at ring attitude territory switch step:

S201, UE B (far-end) carry caller SDP and initiate a call to SRVCC user UEA (local terminal) in the PS territory, and UE A has anchored to SCC AS; UE A replys 180 ALERTING messages with called SDP; The two ends resource has been consulted success, and this session is in ringing condition;

S202, UE A report the wireless access signal to give E-UTRAN, and E-UTRAN triggers SRVCC handover to CS territory according to the wireless access signal deciding; MSC carries STN-SR initiation session handover operation; UEA is in ringing condition always;

S203, MSC initiate initial INVITE session handoff request, and to carry Request-URI be STN-SR, the SDP that MGW supports;

The INVITE that S204, IM CN transmit the session switching asks the AS to SCC;

S204A, SCC AS carries out local terminal and far-end related, therefore before during the calling and called ringing condition initial resource consult, so SCC AS prepares the renewal of far-end is operated;

S205, SCC AS sends UPDATE message and removes to upgrade far-end; This section medium SDP represents that resource can use;

S206, IM CN transmit this UPDATE message and give terminal UE B;

S207, UE B replys 200OK, and the carried terminal media capability;

S208, IM CN transmits 200OK and gives SCCAS;

S209, SCCAS sends 183 message of tape terminal media capability;

S210, IM CN transmit 183 message and give MSC;

S211, MSC replys Prack;

S212, IM CN transmits Prack to SCCAS;

S213, SCC AS replys the 200OK of Prack;

S214, IM CN transmits 200OK to MSC;

S215, SCC AS sends the INFO request, comprises session related information, carry the called switching sign of SCC, and state is ready;

S216, IM CN transmit this INFO and give MSC; MSC receives INFO, judges to switching in called terminal ringing attitude territory according to message content;

S217, MSC replys the response message 200OK of INFO;

S218, IM CN transmits 200OK (INFO) message;

When S219, MSC receive the INFO that carries session related information, enter call-delivery state (Call deliveredstate);

S220A, called subscriber UE A replys at the number off-hook in CS territory;

S220, UEA send CS Connect notice MSC;

S221, MSC receive the called subscriber after the CS of CS off-hook Connect message, send band and reply the INFO of session information to IM CN;

S222, IM CN transmit the INFO of this band response message and give SCC AS;

S223, SCCAS replys the response 200OK message of INFO;

S224, IM CN transmits 200OK (INFO) message and gives MSC;

S225, SCC AS receives INFO, judges called off-hook and replys, and then sends the 200OK message that the off-hook carry false medium SDP is replied;

S226, IM CN transmit this response message and give calling subscriber UE B;

S227, calling subscriber UE B replys ACK;

S228, IM CN transmits ACK to SCC AS;

S229, SCC AS sends 200OK (INVITE) response message, to inform the MSC handover success;

S230, IM CN transmit 200OK (INVITE) message to MSC;

S231, MSC send CS ConnectAck message to UEA, inform handover success;

S232, MSC replys ACK message;

S233, IM CN transmits ACK to SCC AS;

S234-S241, SCCAS send cancellation (CANCEL) and discharge original called that road calling in the PS territory;

Yet, for above ring attitude territory handoff procedure, no matter be caller pattern or called pattern, all must before switching, guarantee the request of session/reply (offer/answer) to consult successfully, otherwise when SCC AS receives ring attitude territory handoff request, can't use UPDATE message to remove to upgrade far-end, thereby can't finish the territory handoff procedure.

Summary of the invention

Main purpose of the present invention is to provide a kind of ring attitude domain switch method and device, to address the above problem at least.

According to an aspect of the present invention, provide a kind of ring attitude domain switch method, this method comprises: in the handoff procedure of calling party and callee's ring attitude territory, SCC AS receives the initiation session handoff request from MSC; SCC AS determines not carry callee's SDP information in the response message that the callee replys when initial session foundation is in the ring attitude; SCC AS forges callee's SDP information, and the callee's that forges SDP information is sent to MSC; MSC continues to finish the follow-up flow process that switch in ring attitude territory according to the callee's who forges SDP information.

Further, before the initiation session handoff request of SCC AS reception from MSC, comprising: the calling party carries the call request of calling party's SDP information to callee's initiation in packet switching PS territory; The callee replys the response message of the SDP information of not carrying the callee, and session is in ringing condition; Local terminal reports the wireless access signal to the universal mobile telecommunications system land radio access web E-UTRAN of evolution, and wherein, local terminal is calling party or callee; E-UTRAN is according to wireless access signal triggering circuit switching (CS) territory, the MSC among the E-UTRAN in the CS territory to SCC AS initiation session handoff request.

Further, determine when initial session foundation is in ringing condition at SCC AS, do not carry after callee's the SDP information in the response message that the callee replys, comprise: SCC AS does not initiate the renewal to far-end, wherein, if local terminal is the calling party, then far-end is the callee, if local terminal is the callee, then far-end is the calling party.

Further, the follow-up flow process of this method comprises: after callee's off-hook was replied, SCC AS initiation session invitation message was carried out cut-in without ball change of current journey to far-end, to obtain the media capability of far-end.

Further, after obtaining the media capability of far-end, this method also comprises: SCC AS discharges the calling in the PS territory between calling party and the callee.

Further, MSC continues to finish the follow-up flow process of switching in ring attitude territory according to the callee's who forges SDP information and comprises: MSC carries out information interchange according to the callee's who forges SDP information and SCCAS, judges that according to the result of information interchange ring territory switch mode is aggressive mode or Passive Mode; MSC carries out corresponding mode according to the result who judges and carries out the switching of ring territory.

Further, ring territory switch mode is an aggressive mode, and MSC carries out corresponding mode according to the result who judges and carries out the ring territory and switch and comprise: MSC receives SCC AS and replys the response message that the back sends at callee's off-hook; MSC sends the CS territory to the calling party and connects from message, and caller notification callee off-hook replys.

Further, ring territory switch mode is a Passive Mode, and MSC carries out corresponding mode according to the result who judges and carries out the ring territory and switch and comprise: MSC receives CS territory connection that the callee sends from message when off-hook is replied; MSC notice SCC AS callee off-hook replys; SCC AS judgement callee off-hook replys, and the SDP information that sends the callee who forges is to the calling party; The calling party transmits a reply message to MSC by SCC AS, informs the MSC handover success.

According to a further aspect in the invention, provide a kind of ring attitude territory switching device shifter, be positioned at SCC AS, having comprised: receiver module, be used at calling party and callee's ring attitude territory handoff procedure, receive initiation session handoff request from MSC; Determination module is used to determine do not carry callee's SDP information in the response message that the callee replys when initial session foundation is in the ring attitude; Processing module is used to forge callee's SDP information; Sending module, the SDP information that is used for the callee that will forge sends to MSC, so that MSC continues to finish the follow-up flow process that switch in ring attitude territory according to the callee's who forges SDP information.

Further, this device also comprises: handover module, be used for after callee's off-hook is replied, the initiation session invitation message is carried out cut-in without ball change of current journey to far-end, to obtain the media capability of far-end, wherein, if ring attitude territory handoff procedure is initiated by the calling party, then far-end is the callee, if ring attitude territory handoff procedure is initiated by the callee, then far-end is the calling party.

Further, this device also comprises: release module, be used for after handover module gets access to the media capability of far-end, and discharge the calling between calling party and the callee in the PS territory.

By the present invention, the mode of the message of the SDP information of SCCAS by constructing a callee who carries forgery, solved before the switching of ring attitude territory, if session negotiation just can not finished the problem of handoff procedure under the case of successful between this end subscriber and the remote subscriber, and then reached to guarantee no matter be under caller pattern or the called pattern, still can finish ring attitude territory handoff procedure smoothly in this end subscriber and the unsuccessful situation of remote subscriber session negotiation.

Description of drawings

Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:

Fig. 1 switches the caller model process according to the 3GPP SRVCC ring attitude territory of correlation technique;

Fig. 2 switches called model process according to the 3GPP SRVCC ring attitude territory of correlation technique;

Fig. 3 is the ring attitude domain switch method flow chart according to the embodiment of the invention;

Fig. 4 is that caller model process figure is switched in Fake SDP SRVCC ring attitude territory according to the preferred embodiment of the invention;

Fig. 5 is that called model process figure is switched in Fake SDP SRVCC ring attitude territory according to the preferred embodiment of the invention;

Fig. 6 is the ring attitude territory switching device shifter schematic diagram according to the embodiment of the invention.

Embodiment

Hereinafter will describe the present invention with reference to the accompanying drawings and in conjunction with the embodiments in detail.Need to prove that under the situation of not conflicting, embodiment and the feature among the embodiment among the application can make up mutually.

Fig. 3 is the ring attitude domain switch method flow chart according to the embodiment of the invention, and as shown in Figure 3, in the handoff procedure of calling party and callee's ring attitude territory, this method mainly comprises following step:

Step S302, SCC AS receives the initiation session handoff request from MSC;

In preferred implementation of the present invention; when the calling party makes a call when request to the callee; no matter whether the callee replys the ALERTING message that carries protection callee SDP information, the calling party all can at first anchor to SCC AS, makes the conversation request state be in ringing condition simultaneously.The calling party carries the call request of calling party's SDP information to callee's initiation in the PS territory, the callee replys the response message of the SDP information of not carrying the callee, and session is in ringing condition.Particularly, keep the calling party under the state of ring always, MSC initiates initial invitation session handoff request, in actual applications, a retransmission unit can be set, information between MSC and SCC AS can be transmitted with this retransmission unit, the information between calling party, callee, MSC and the SCC AS can certainly be used to transmit.Thus, be provided with under the situation of this retransmission unit, the above-mentioned initial invitation session handoff request that MSC initiates can be transmitted to SCC AS by this retransmission unit.Local terminal reports the wireless access signal to the universal mobile telecommunications system land radio access web E-UTRAN of evolution, wherein, local terminal is calling party or callee, and E-UTRAN is according to wireless access signal triggering circuit switching (CS) territory, the MSC among the E-UTRAN in the CS territory to SCC AS initiation session handoff request.

Step S304, SCC AS determine not carry callee's Session Description Protocol SDP information in the response message that the callee replys when initial session foundation is in the ring attitude;

Determine when initial session foundation is in ringing condition at SCC AS, SCC AS accepts the response message that the callee replys, directly judge the part whether SDP information is arranged in this response message, after SCC AS judged and determine not carry callee's SDP information in the response message that the callee replys, SCC AS did not initiate the renewal to far-end, wherein, if local terminal is the calling party, then far-end is the callee, if local terminal is the callee, then far-end is the calling party.

Step S306, SCC AS forge callee's SDP information, and the callee's that forges SDP information is sent to MSC;

In a preferred embodiment of the invention, SCC AS has forged a kind of response message, and really not possessing callee's SDP information in this response message, SCC AS sends to MSC with the callee's that forges SDP information, consults with the initial offer/answer that finishes local terminal.

Step S308, MSC continues to finish the follow-up flow process that switch in ring attitude territory according to the callee's who forges SDP information.

In the specific embodiment of the present invention, after MSC receives callee's the SDP information of forgery, SDP information and SCC AS according to the callee who forges carry out information interchange, result according to information interchange judges that ring territory switch mode is aggressive mode or Passive Mode, carries out corresponding mode according to the result who judges then and carries out the switching of ring territory.

For example, when ring territory switch mode is an aggressive mode, MSC receives SCC AS and replys the response message that the back sends at callee's off-hook, MSC know the callee off-hook reply, MSC sends the CS territory to the calling party and connects from message then, caller notification callee off-hook replys, MSC is behind the response message that receives the CS territory successful connection that the calling party returns, send response message to SCCAS, notify the callee by SCCAS again, thereby finish switching.

When ring territory switch mode is a Passive Mode, when callee's off-hook is replied, the CS territory that MSC reception callee sends when off-hook is replied connects from message, notify then SCC AS callee off-hook reply, SCC AS judgement callee off-hook replys, the SDP information that sends the callee who forges is to the calling party, and the calling party transmits a reply message to MSC by SCC AS, informs the MSC handover success.

In actual applications, after callee's off-hook is replied, SCC AS initiation session invitation message is to far-end, carry out cut-in without ball change of current journey, to obtain the media capability of far-end, after obtaining the media capability of far-end, SCC AS discharges the calling in the PS territory between calling party and the callee, thereby can conserve network resources.

Below with reference to Fig. 3 and above-mentioned execution mode, respectively the ring territory switching flow of aggressive mode and Passive Mode is described in conjunction with Fig. 4, Fig. 5.

Fig. 4 is that caller model process figure is switched in Fake SDP SRVCC ring attitude territory according to the preferred embodiment of the invention, and as shown in Figure 4, whole caller switching flow carries out according to the following step:

S401, SRVCC user UEA carry caller SDP and initiate a call to UE B in the PS territory, and have anchored to SCCAS; UE B replys 180 ALERTING messages with called SDP; This session is in ringing condition;

S402, UE A report the wireless access signal to give E-UTRAN, and E-UTRAN triggers SRVCC handover to CS territory according to the wireless access signal deciding; MSC carries STN-SR initiation session handover operation; UEA is in ringing condition always;

S403, MSC initiate initial INVITE session handoff request, and to carry Request-URI be STN-SR, the SDP that MGW supports;

The INVITE that S404, IM CN transmit the session switching asks the AS to SCC;

S404A, SCC AS carries out local terminal and far-end related, therefore before during the calling and called ringing condition initial resource do not consult, so SCCAS ignores at this moment the renewal of far-end is operated;

S405, SCC AS sends and carries 183 message of false answer medium to IM CN; The false answer media representation of this section resource can be used;

S406, IM CN transmit 183 message of the false answer medium of this band and give MSC;

S407, MSC replys Prack;

S408, IM CN transmits Prack to SCCAS;

S409, SCC AS replys the 200OK of Prack;

S410, IM CN transmits 200OK to MSC;

S411, SCCAS sends the INFO request, comprises session related information, carry the SCC caller and switch sign, and state is ready;

S412, IM CN transmit this INFO and give MSC; MSC receives INFO, judges to switching in caller ring attitude territory according to message content;

S413, MSC replys the response message 200OK of INFO;

S414, IM CN transmits 200OK (INFO) message;

When S415, MSC receive the INFO that carries session related information, enter call-delivery state (Call deliveredstate);

S416, called subscriber UE B off-hook is replied, and sends 200OK (INVITE) message, carries called subscriber's SDP;

S417, IM CN transmits response message and gives SCCAS;

S418, SCCAS lay down called medium SDP, transmit the 200OK message that called off-hook is replied;

S419, IM CN transmits response message and gives MSC;

S420, MSC by CS Connect from message inform UE A (CS) far-end called subscriber off-hook reply;

S421, UEA (CS) reply CS ConnectAck message;

S422, MSC replys ACK message;

S423, IM CN transmit ACK message to SCC AS;

S424, SCC AS transmits ACK message;

S425, IM CN transmit ACK message to UE B;

S426, SCCAS initiate not with the Re-invite message of medium SDP the far-end called subscriber to be initiated the cut-in without ball flow process;

S427, IM CN transmit this cut-in without ball Re-invite request message to distance terminal UE B;

S428, follow-up cut-in without ball flow process is no longer narrated;

S429, after the cut-in without ball flow process was finished, so far medium carried and finish, and had finished switching flow simultaneously;

S430-S433, SCCAS send 404 and discharge that road calling that original caller is initiated from PS.

Fig. 5 is that called model process figure is switched in Fake SDP SRVCC ring attitude territory according to the preferred embodiment of the invention; As shown in Figure 4, whole called switching flow carries out according to the following step:

S501, UE B carry caller SDP and initiate a call to SRVCC user UEA in the PS territory, and UEA has anchored to SCCAS; UEA replys 180 ALERTING messages with called SDP; This session is in ringing condition;

S502, UE A report the wireless access signal to give E-UTRAN, and E-UTRAN triggers SRVCC handover to CS territory according to the wireless access signal deciding; MSC carries STN-SR initiation session handover operation; UEA directly is in ringing condition;

S503, MSC initiate initial INVITE session handoff request, and to carry Request-URI be STN-SR, the SDP that MGW supports;

The INVITE that S504, IM CN transmit the session switching asks the AS to SCC;

S504A, SCC AS carries out local terminal and far-end related, therefore before during the calling and called ringing condition initial resource do not consult, so SCCAS ignores at this moment the renewal of far-end is operated;

S505, SCC AS sends and carries 183 message of false answer medium to IM CN; The false answer media representation of this section resource can be used;

S506, IM CN transmit 183 message of the false answer medium of this band and give MSC;

S507, MSC replys Prack;

S508, IM CN transmits Prack to SCCAS;

S509, SCC AS replys the 200OK of Prack;

S510, IM CN transmits 200OK to MSC;

S511, SCC AS sends the INFO request, comprises session related information, carry the called switching sign of SCC, and state is ready;

S512, IM CN transmit this INFO and give MSC; MSC receives INFO, and that is judged to switching in called terminal ringing attitude territory according to message content;

S513, MSC replys the response message 200OK of INFO;

S514, IM CN transmits 200OK (INFO) message;

When S515, MSC receive the INFO that carries session related information, enter call-delivery state (Call deliveredstate);

S516A, called subscriber UEA replys at the number off-hook in CS territory;

S516, UEA send CS Connect notice MSC;

S517, MSC receive the called subscriber after the CS of CS off-hook Connect message, send band and reply the INFO of session information to IM CN;

S518, IM CN transmit the INFO of this band response message and give SCCAS;

S519, SCCAS replys the response 200OK message of INFO;

S520, IM CN transmits 200OK (INFO) message and gives MSC;

S521, SCC AS receives INFO, judges called off-hook and replys, and then sends the 200OK message that the off-hook carry false medium SDP is replied;

S522, IM CN transmit this response message and give calling subscriber UE B;

S523, calling subscriber UE B replys ACK;

S524, IM CN transmits ACK to SCC AS;

S525, SCCAS sends 200OK (INVITE) response message, to inform the MSC handover success;

S526, IM CN transmit 200OK (INVITE) message to MSC;

S527, MSC send CS Connect Ack message to UE A, inform handover success;

S528, MSC replys ACK message;

S529, IM CN transmits ACK to SCC AS;

S530, SCCAS initiate not with the Re-invite message of medium SDP the far-end called subscriber to be initiated the cut-in without ball flow process;

S531, IM CN transmit this cut-in without ball Re-invite request message to distance terminal UE B;

S532, follow-up cut-in without ball flow process is no longer narrated;

S533, after the cut-in without ball flow process was finished, so far medium carried and finish, and had finished switching flow simultaneously;

S534-S541, SCC AS send CANCEL and discharge original called that road calling in the PS territory.

Said method by the embodiment of the invention provides can be in the ring attitude in initial session foundation, under the situation that session offer/answer state is not successfully consulted, finishes ring attitude territory and switches, thereby improved user experience.

Fig. 6 is the ring attitude territory switching device shifter schematic diagram according to the embodiment of the invention, and this device is positioned at SCC AS, can be used to the said method of realizing that the embodiment of the invention provides.As shown in Figure 6, this device mainly comprises: receiver module 10, be used at calling party and callee's ring attitude territory handoff procedure, and receive initiation session handoff request from MSC; Determination module 20 is used to determine do not carry callee's SDP information in the response message that the callee replys when initial session foundation is in the ring attitude; Processing module 30 is used to forge callee's SDP information; Sending module 40, the SDP information that is used for the callee that will forge sends to MSC, so that MSC continues to finish the follow-up flow process that switch in ring attitude territory according to the callee's who forges SDP information.

In order to continue to finish the negotiation of session offer/answer state, this device can also comprise: handover module 50, be used for after callee's off-hook is replied, the initiation session invitation message is carried out cut-in without ball change of current journey to far-end, to obtain the media capability of far-end, wherein, if ring attitude territory handoff procedure is initiated by the calling party, then far-end is the callee, if ring attitude territory handoff procedure is initiated by the callee, then far-end is the calling party.

After finishing the follow-up flow process of switching in ring attitude territory, be fully used in order to make PS territory resource, this device can also comprise: release module 60, be used for after handover module gets access to the media capability of far-end, and discharge the calling between calling party and the callee in the PS territory.

From above description, as can be seen, in embodiments of the present invention, SCC AS sets up at definite initial session and is in the ring attitude, under the situation that session offer/answer state is not successfully consulted, SCC AS does not upgrade far-end, and the message of having constructed a callee's who carries forgery SDP information sends to MSC, consult with the offer/answer that finishes local terminal, after called off-hook is replied, SCC AS initiates new session invitation message again to far-end, carrying out cut-in without ball changes, thereby obtain the media capability of far-end, finish media negotiation, thereby solved before the switching of ring attitude territory, if session negotiation just can not finished the problem of handoff procedure under the case of successful between this end subscriber and the remote subscriber, and then reached to guarantee no matter be under caller pattern or the called pattern, still can finish ring attitude territory handoff procedure smoothly in this end subscriber and the unsuccessful situation of remote subscriber session negotiation, improved user experience, and after switching is finished, abandon the calling between the PS territory by this end subscriber and remote subscriber at first, thereby reached the effect of saving Internet resources.

Obviously, those skilled in the art should be understood that, above-mentioned each module of the present invention or each step can realize with the general calculation device, they can concentrate on the single calculation element, perhaps be distributed on the network that a plurality of calculation element forms, alternatively, they can be realized with the executable program code of calculation element, thereby, they can be stored in the storage device and carry out by calculation element, and in some cases, can carry out step shown or that describe with the order that is different from herein, perhaps they are made into each integrated circuit modules respectively, perhaps a plurality of modules in them or step are made into the single integrated circuit module and realize.Like this, the present invention is not restricted to any specific hardware and software combination.

The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims

1. a ring attitude domain switch method is characterized in that, in the handoff procedure of calling party and callee's ring attitude territory, described method comprises:

Injection voice continuity application server SCC AS reception frequently is from the initiation session handoff request of moving exchanging center MSC;

Described SCC AS determines not carry described callee's Session Description Protocol SDP information in the response message that described callee replys when initial session foundation is in the ring attitude;

Described SCC AS forges described callee's SDP information, and the described callee's that will forge SDP information sends to described MSC;

Described MSC continues to finish the follow-up flow process that switch in described ring attitude territory according to the described callee's of described forgery SDP information.

2. method according to claim 1 is characterized in that, before the initiation session handoff request of described SCC AS reception from MSC, comprising:

Described calling party carries the call request of described calling party's SDP information to described callee's initiation in packet switching PS territory;

Described callee replys the response message of the SDP information of not carrying described callee, and session is in ringing condition;

Local terminal reports the wireless access signal to the universal mobile telecommunications system land radio access web E-UTRAN of evolution, and wherein, described local terminal is described calling party or described callee;

Described E-UTRAN is according to described wireless access signal triggering circuit switching (CS) territory, the described MSC among the described E-UTRAN in described CS territory to described SCC AS initiation session handoff request.

3. method according to claim 2 is characterized in that, determines not carry after described callee's the SDP information in the response message that described callee replys when initial session foundation is in ringing condition at described SCC AS, comprising:

Described SCC AS does not initiate the renewal to far-end, and wherein, if described local terminal is described calling party, then described far-end is described callee, if described local terminal is described callee, then described far-end is described calling party.

4. method according to claim 3 is characterized in that, described follow-up flow process comprises:

After described callee's off-hook was replied, described SCC AS initiation session invitation message was carried out cut-in without ball change of current journey, to obtain the media capability of described far-end to described far-end.

5. method according to claim 4 is characterized in that, after obtaining the media capability of described far-end, also comprises: described SCC AS discharges the calling in the PS territory between described calling party and the described callee.

6. method according to claim 1 is characterized in that, described MSC continues to finish the follow-up flow process of switching in described ring attitude territory according to the described callee's of described forgery SDP information and comprises:

Described MSC carries out information interchange according to the described callee's of described forgery SDP information and described SCCAS, judges that according to the result of described information interchange ring territory switch mode is aggressive mode or Passive Mode;

Described MSC carries out corresponding mode according to the result who judges and carries out the switching of ring territory.

7. method according to claim 6 is characterized in that, described ring territory switch mode is an aggressive mode, and described MSC carries out corresponding mode according to the result who judges and carries out the ring territory and switch and comprise:

Described MSC receives described SCC AS and replys the response message that the back sends at described callee's off-hook;

Described MSC sends the CS territory to described calling party and connects from message, notify the described callee of described calling party off-hook reply.

8. method according to claim 6 is characterized in that, described ring territory switch mode is a Passive Mode, and described MSC carries out corresponding mode according to the result who judges and carries out the ring territory and switch and comprise:

Described MSC receives the CS territory that described callee sends and connects from message when off-hook is replied;

Described MSC notify the described callee of described SCCAS off-hook reply;

Described SCC AS judge described callee off-hook reply, described callee's the SDP information that sends described forgery is to described calling party;

Described calling party transmits a reply message to described MSC by described SCC AS, informs described MSC handover success.

9. a ring attitude territory switching device shifter is positioned at SCC AS, it is characterized in that, comprising:

Receiver module is used at calling party and callee's ring attitude territory handoff procedure, receives the initiation session handoff request from moving exchanging center MSC;

Determination module is used to determine do not carry described callee's Session Description Protocol SDP information in the response message that described callee replys when initial session foundation is in the ring attitude;

Processing module is used to forge described callee's SDP information;

Sending module, the SDP information that is used for the described callee that will forge sends to described MSC, so that described MSC continues to finish the follow-up flow process that switch in described ring attitude territory according to the described callee's of described forgery SDP information.

10. device according to claim 9 is characterized in that, also comprises:

Handover module, be used for after described callee's off-hook is replied, the initiation session invitation message is to far-end, carry out cut-in without ball change of current journey, to obtain the media capability of described far-end, wherein, if described ring attitude territory handoff procedure is initiated by described calling party, then described far-end is described callee, if described ring attitude territory handoff procedure is initiated by described callee, then described far-end is described calling party.

11. device according to claim 10 is characterized in that, also comprises:

Release module is used for after described handover module gets access to the media capability of described far-end, discharges the calling in the PS territory between described calling party and the described callee.