CN101662756A - Voice continuous call switching method and system and mobile service switching center - Google Patents

Voice continuous call switching method and system and mobile service switching center Download PDF

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Publication number
CN101662756A
CN101662756A CN200810198084A CN200810198084A CN101662756A CN 101662756 A CN101662756 A CN 101662756A CN 200810198084 A CN200810198084 A CN 200810198084A CN 200810198084 A CN200810198084 A CN 200810198084A CN 101662756 A CN101662756 A CN 101662756A
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vcc
current
vdn
stn
emergency call
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Chinese (zh)
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孙晓姬
于益俊
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Priority to CN200810198084A priority Critical patent/CN101662756A/en
Priority to PCT/CN2009/072313 priority patent/WO2010022611A1/en
Publication of CN101662756A publication Critical patent/CN101662756A/en
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    • 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]

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The invention discloses a voice continuous call switching method comprising the following steps: receiving SR VCC switching request information carrying emergency call information; knowing the switching request which is currently the emergency call SR VCC according to the switching request information; and executing the emergency call SR VCC switching, and switching from the current network side to a target network side. Correspondingly, the invention also discloses a network system, a mobile service switching center, a mobile management entity and GPS service support points for the voice continuous call switching. The scheme enables the mobile service switching center (MSC) to know that the current call is the emergency call SR VCC, so that the current call routing completes the voice call anchoring in the IMS domain so as to finally realize the emergency call SR VCC switching.

Description

Voice continuous call switching method, system and mobile services switching centre
Technical field
The present invention relates to communication technical field, relate in particular to a kind of voice continuous call switching method and system, mobile management entity, GPRS service support point and mobile services switching centre.
Background technology
3GPP is in order to strengthen the competitiveness of future network, studying a kind of brand-new evolvement network, UMTS Terrestrial radio access network (the E-UTRAN that comprises evolution, Evolved UMTS Terrestrial RadioAccess Network), be used to realize all and the wireless function associated of evolvement network; Mobility Management Entity (MME, Mobility Management Entity) is responsible for the mobile management of chain of command, comprises the management of user's context and mobile status, distributing user temporary identity sign etc.; (SGW ServingGateway), is the user's face anchor point between the 3GPP access network to service gateway entity, stops the interface of E-TURAN; Grouped data network gateway entity (PGW, Packet Data Network Gateway) is the user's face anchor point between 3GPP access network and the non-3 GPP access network network, the interface of termination and external packet data network (PDN, Packet DataNetwork) etc.
3GPP by in network based on introducing continuous voice call (Voice Call Continuity in IP Multimedia System (IMS) territory, VCC) use, realize terminal (User Equipment, the voice continuity of audio call UE) between CS territory and PS territory.When UE carries out the VCC business, MME sends message informing mobile services switching centre (Mobile Services Switching Center, MSC) carry out single system and insert voice continuous call (Single Radio VCC, SR VCC) the professional switching, MSC routes to the IMS territory to switch with ongoing speech business.
In realizing process of the present invention, the inventor finds that there are the following problems at least in the prior art:
In SR VCC call treatment technique, at present, the technology that realizes emergency call SR VCC business is not arranged also.
Summary of the invention
Embodiment of the invention technical problem to be solved is, provide SR VCC to call out method and system, mobile management entity, GPRS service support point and the mobile services switching centre that switches, make MSC can know that current calling is emergency call SR VCC, handle thereby finish emergency call SR VCC.
In order to solve the problems of the technologies described above, the embodiment of the invention provides a kind of voice continuous call switching method, comprising:
Reception carries single connecting system voice continuity SR VCC handoff request message of urgent call indication information;
Know the current emergency call SR VCC handoff request that is according to described handoff request message;
Carry out emergency call SR VCC and switch, switch to the objective network side from the current network side.
The embodiment of the invention also provides a kind of method, comprising:
When judging current calling and being emergency call SR VCC, carry out emergency call SR VCC and handle;
In carrying out described emergency call SR VCC processing procedure, obtain the VDN or the STN-SR that are used to finish emergency call SR VCC switching.
Correspondingly, the embodiment of the invention also provides a kind of network system, comprising:
Mobile management entity or GPRS service support point are used to send the handoff request message that carries the urgent call indication information;
Mobile services switching centre is used to receive the SR VCC handoff request message that carries the urgent call indication information, when knowing current handoff request for emergency call SR VCC according to described handoff request message, carry out emergency call SR VCC and switch, switch to the objective network side from the current network side.
The embodiment of the invention also provides a kind of network system, comprises mobile management entity or GPRS service support point,
When described mobile management entity or GPRS service support point are used to judge current calling and are urgent call, carry out emergency call SR VCC and handle, and in the process of carrying out emergency call SR VCC processing, obtain VDN or the STN-SR that is used to finish emergency call SR VCC switching.
The embodiment of the invention also provides a kind of mobile services switching centre, comprising:
Receiving element is used to receive the SR VCC handoff request message that carries the urgent call indication information;
Processing unit is used for carrying out the professional switching of emergency call SR VCC according to the SR VCC handoff request message of described urgent call indication information.
The embodiment of the invention also provides a kind of device, comprising:
Judging unit is used to judge whether current calling is emergency call SR VCC;
Transmitting element is used for going out current calling when being emergency call SR VCC when described judgment unit judges, send carry the urgent call indication information emergency call SR VCC handoff request message to mobile services switching centre.
Implement the embodiment of the invention, have following beneficial effect:
The embodiment of the invention informs that by sending the urgent call indication information the current calling of mobile services switching centre is emergency call SR VCC, make mobile services switching centre to handle according to emergency call SR VCC flow process, and current urgent call is routed to the IMS territory finish the audio call hand-off process, satisfy the demand of terminal and network side.
Description of drawings
Fig. 1 is the network system architecture schematic diagram that is used to illustrate the embodiment of the invention;
Fig. 2 is the method flow diagram that the SR VCC of the realization urgent call of the embodiment of the invention one switches;
Fig. 3 is the method flow diagram that the R VCC of the realization urgent call of the embodiment of the invention two switches;
Fig. 4 is an example according to the SR VCC switching of the realization urgent call of the embodiment of the invention two;
Fig. 5 is the method flow diagram that the SR VCC of the realization urgent call of the embodiment of the invention three switches;
Fig. 6 is an example realizing the SR VCC switching of urgent call according to the embodiment of the invention of Fig. 5;
Fig. 7 is another example of realizing the SR VCC switching of urgent call according to the embodiment of the invention of Fig. 5;
Fig. 8 is the structural representation of the network system of the embodiment of the invention;
Fig. 9 is the structural representation of the mobile services switching centre of the embodiment of the invention;
Figure 10 is the structural representation of mobile network's entity of the embodiment of the invention.
Embodiment
The present invention is described in further detail below in conjunction with accompanying drawing.
Fig. 1 is used to illustrate the network system architecture schematic diagram of realizing the embodiment of the invention.With reference to figure 1, described network system architecture comprises the UMTS Terrestrial radio access network (E-UTRAN of evolution, Evolved UMTSTerrestrial Radio Access Network), wireless access network (GERAN), and Universal Terrestrial Radio Access Network (UTRAN), mobility management network element (MME, Mobility Management Entity), be responsible for the mobile management of chain of command, comprise the management of user's context and mobile status, distributing user temporary identity sign etc.; Service gateway entity (SGW, Serving Gateway) is the user's face anchor point between the 3GPP access network, stops the interface of E-TURAN; Grouped data network gateway entity (PGW, Packet DataNetworkGateway) is the user's face anchor point between 3GPP access network and the non-3 GPP access network network, the interface of termination and external packet data network (PDN, Packet Data Network)."Policy and Charging Rules Function entity (PCRF, Policy and Charging Rule Function) is used for policy control decision and flow based charging controlled function.Home network server (HSS, Home Subscriber Server) is used for storing user subscription information.
The embodiment of the invention is an example with the network system of Fig. 1, illustrate when UE when the eUTRAN network side has been initiated emergency call SR VCC, how network side assists UE to switch to the process in the CS territory of UTRAN/GERAN from the eUTRAN network.The MSC of the embodiment of the invention knows that according to the urgent call indication information that receives current calling is emergency call SR VCC, thereby finishes follow-up emergency call SR VCC handling process.
Fig. 2 is the method flow diagram that the SR VCC of the realization urgent call of the embodiment of the invention one switches.As shown in Figure 2, described method comprises step:
S201, reception carry the SR VCC handoff request message of urgent call indication information;
In the present embodiment, UE sends measurement report to source connecting system eUTRAN, if source eUTRAN judges the objective network side and supports SR VCC ability, eUTRAN sends handoff request message informing MME, carries SR VCC indication (SR VCC indication) parameter in the message and switches in order to indication SR VCC.Correspondingly, MME can know that current calling is emergency call SR VCC according to the urgent call indication information that the UE that receives sends, or whether MME is that urgent call Qos knows whether current calling is urgent call according to the Qos of voice bearer correspondence in the current calling, can also be that (whether Access Point Name APN) belongs to urgent APN (Emergency APN) and know whether current calling is urgent call MME according to the corresponding Access Point Name of carrying.If current calling is emergency call SR VCC, then MME knows that according to the handoff request message that carries SR VCC indication parameter that receives current needs switch, transmission carries the SR VCC handoff request message of urgent call indication information to MSC, makes MSC know that current needs carry out emergency call SR VCC hand-off process.
Similarly, when inserting (High Speed Packet Access from high-speed packet, when HSPA) VOIP switches to the CS territory of UTRAN/GERAN, can be that (Serving GPRSSupporting Node SGSN) finishes the process of corresponding transmission urgent call indication information to MSC to GPRS service support point.
S202, know the current handoff request of emergency call SR VCC that is, carry out emergency call SR VCC and switch, switch to the objective network side from the current network side according to described handoff request message;
In the present embodiment, MSC knows that according to receiving described handoff request message current needs carry out SR VCC hand-off process, know that from the urgent call indication information that handoff request message is carried current calling is urgent call, need carry out emergency call SR VCC hand-off process.
In the present embodiment, MSC sends the objective network side that handovers information to that carries the urgent call indication information and informs that need carry out emergency call SR VCC switches, after the objective network side joint is received above-mentioned information, carry out the urgent call resource and prepare, and return corresponding response message to MSC.MSC finishes and calls out the grappling route to the IMS territory, and sends to switch and be indicated to UE, impel UE from the current network side switch to the objective network side (as, GERAN or UTRAN).
Fig. 3 is the method flow diagram that the SR VCC of the realization urgent call of the embodiment of the invention two switches.As shown in Figure 3, described method comprises step:
S301, reception carry the SR VCC handoff request message of urgent call indication information;
In the present embodiment, the described SR VCC handoff request message that carries the urgent call indication information comes from MME/SGSN, and the mode that described handoff request message is carried the urgent call indication information comprises following:
One, carries urgent indication information Emergency Indication parameter in the described message;
Two, described type of message is special type of message, as emergency call message type (EmergencyForward relocation Req);
Three, MME/SGSN is when knowing that current calling is urgent call, carries empty VCC territory translation number (VDN) or SRVCC session Handover Number (STN-SR) in described handoff request message to inform that the current calling of MSC belongs to urgent call;
Four, the expansion indicating bit informs that the current calling of MSC belongs to urgent call in the cell in described message, can expand VDN or STN-SR herein, can also expand other existing cells and make it to carry the urgent call indication.For example, VDN or STN-SR are become expansion VDN or expansion STN-SR, promptly exist an indicating bit to illustrate that this calling is urgent call.
S302, know the current handoff request of emergency call SR VCC that is according to described SR VCC handoff request message;
In the present embodiment, MSC knows that according to receiving described handoff request message from MME or SGSN current needs carry out SR VCC hand-off process, the urgent call indication information that carries from described handoff request message knows that current calling is urgent call simultaneously, need carry out the SR VCC hand-off process of urgent call.
S303, transmission carry the described objective network side of handovering information to of described urgent call indication information, are that emergency call SR VCC switches to notify the current calling of described objective network side.
In the present embodiment, MSC might not send urgent call indication information notification target network side, can also be to know when current calling is emergency call SR VCC, and high priority is set, thereby realizes that corresponding emergency call SR VCC handles.
S304, in carrying out the SRVCC handoff procedure of urgent call, obtain current VDN or STN-SR, route the call to the IMS territory according to described current VDN or STN-SR;
In the normal SR VCC flow process, MSC does not need to report concrete positional information and obtain routing iinformation to GMLC or E-RUA transmission Subscriber Location Report request (MAP Subscrier Location Report) message.And in the emergency call SR VCC processing procedure, it is current when being urgent call that MSC is known, need send the information reporting positional information and obtain routing iinformation to GMLC/LRF or E-RUA, to realize that current urgent call is routed to the IMS territory.For example, MSC sends the Subscriber Location Report request message to GMLC/E-RUA, and GMLC sends the Subscriber Location Report response message that carries VDN or STN-SR, and described MSC is known VDN or STN-SR according to the Subscriber Location Report corresponding message that receives.
Alternatively, MSC can also be in the emergency call SR VCC handoff procedure, receives current VDN or STN-SR that MME or SGSN send, switches to described objective network side according to described current VDN or STN-SR from described current network side.Obtaining of current VDN or STN-SRDE can be in the UE handoff procedure, provided by territory handover (mih) functions DTF, E-RAU or the GMLC/LRF in IMS territory.
S305, UE switch to the objective network side from the current network side.
The embodiment of the invention informs that by carrying urgent indication information the current calling of mobile services switching centre is urgent call, make mobile services switching centre to come treatment S RVCC to switch, therefore can satisfy the demand of terminal and network side according to the SR VCC flow process of urgent call.
Fig. 4 is an example according to the SR VCC switching of the realization urgent call of the embodiment of the invention two.As shown in Figure 4, when UE switches to target UTRAN/GERAN network by the eUTRAN network, network side MME brings MSC with the urgent call indication information, and MSC judges according to the urgent call indication information to be emergency call SR VCC handling process, to finish follow-up emergency call SR VCC handling process then current.Described method comprises:
Step 401, UE send measurement report to source connecting system eUTRAN;
If step 402, source eUTRAN judge target side network support SR VCC ability, eUTRAN sends Handvoer Required message informing source MME, carry Source to TargetTransparent Container and SRVCC indication parameter in the message;
Step 403a, send the MSC of Forward relocation Req message to source;
Herein, it is voice bearer or non-voice carrying that MME distinguishes current according to the QCI among the QoS (QoS Class identifier) parameter, if voice bearer, and further according to the Qos of this voice bearer correspondence whether be urgent call Qos or according to the Access Point Name of this voice bearer correspondence (whether Access Point Name APN) belongs to urgent APN (Emergency APN) and knows whether current calling is urgent call.If current calling is emergency call SR VCC, then MME transmits handoff request message (Forward relocation Req) to MSC according to the SR VCC indication information transmission that eUTRAN sends, carrying Emergency Indication parameter in the message, to be used to indicate current calling be urgent call, Emergency Indication parameter mainly is that MME is used to inform that MSC current sessions (the follow-up possibility that may have many sessions, so this indication may be at one of them session) is urgent call.Also carry VDN, MSISDN in the described message, Source to Target Transparent Container, parameters such as MM Context.
Step 403b, MSC send Prepare HO Req message to target side MSC, carry Emergency Indication parameter in the message and give target side MSC, and the MSC of notification target side does the urgent call resource and prepares;
Step 403c, target side MSC initiate CS relocation flow process.Target side MSC sends RelocationRequest message, carry Source to Target Transparent Container parameter and Emergency Indication parameter in the message and give target side RNS (Radio Network System), notification target side RNS does the urgent call resource and prepares;
Step 404a, MME send Forward Relocation Req message to target side SGSN, initiate PS relocation, carry Source to Target Transparent Container in the message, MM Context;
Step 404b, SGSN send Relocation Request message, carry Source to TargetTransparent Container in the message.
Step 405a, target side RNS coordinated allocation PS and CS resource, and send Relocation RequestAcknowledge message to target side SGSN, carry Target to Source TransparentContainer in the message.
Step 405b, target side SGSN send Forward Relocation Response message, carry Target to Source Transparent Container message in the message and give source MME.
In the embodiment of the invention, step 404a, 404b, 405a and 405b switch in target side network support double-transmission mode PS territory that (Dual Transfer Mode PS handover DTM/PSHO), and currently carries out when having the non-voice carrying.
Step 406a, target side RNS send Relocation Request Acknowledge message, carry Target to Source Transparent Container in the message and give target side MSC.
Step 406b, Target MSC send Prepare HO Response message to MSC Server.
Step 406c, the circuit of setting up between the MGW of target side MSC and MSC server association connect.
Step 407a, MSC know that according to the Emergency indication parameter of obtaining among the step 3a current is urgent call, then send Map Subscriber Location Report Request message to GMLC/LRF, carry information such as IMSI, IMEI, MSISDN, VMSC address in the message.
Step 407b, GMLC/LRF send the MSC of Map Subscriber Location Report Response message to source.
The MSC of step 408, source is initiated to the territory switching in IMS territory, upgrades access leg, and this moment, voice packet was received and dispatched from the CS territory.
Step 409, source MSC send Forward Relocation Response message to source MME, carry Target to Source Transparent Container in the message.
Step 410, source MME send Handover Command message to source eUTRAN, carry Target to Source Transparent Container in the message.
Step 411, eUTRAN send Handover from eUTRAN Command message to UE, impel UE to switch to aiming field.
Step 412, UE switch to aiming field, and switching is finished.
In embodiments of the present invention, also provide the method for obtaining VDN or STN-SR in a kind of emergency call SR VCC business, described VDN or STN-SR are used to finish emergency call SR VCC switching processing.
Said method comprises step:
When judging current calling and being emergency call SR VCC, carry out emergency call SR VCC and handle;
Herein, MME or SGSN can know that current calling is urgent call according to the urgent call indication information that the UE that receives sends, or whether be that urgent call Qos knows whether current calling is urgent call according to the Qos of voice bearer correspondence in the current calling, can also be that (whether Access Point Name APN) belongs to urgent APN (Emergency APN) and know whether current calling is urgent call for Access Point Name according to this voice bearer correspondence.
In carrying out described emergency call SR VCC processing procedure, obtain the VDN or the STN-SR that are used to finish emergency call SR VCC switching;
Wherein, can be in the process that urgent call is set up, also can be when carrying out the SR VCC handoff procedure of urgent call, to obtain current VDN or STN-SR, the mode of obtaining comprises following:
When one, MME/SGSN judges current calling and is urgent call, send a request message (for example location information request message) act on behalf of E-RUA or GMLC GMLC for urgent remote subscriber, described E-RUA or GMLC/LRF send the response message (correspondingly, being location information response message) that carries current VDN or STN-SR and give MME/SGSN;
Two, the DTF in IMS territory sends to UE (if VDN or STN-SR change in the calling procedure, then DTF can send to UE with VDN or the STN-SR after changing) with up-to-date VDN or STN-SR; Up-to-date VDN or STN-SR that UE will receive send to MME/SGSN.
Herein, UE can be by sending IMS domain signaling 200OK message to DTF, and described DTF sends to UE with current VDN or STN-SR.Can also be UE after the registration of IMS territory, UE in the professional grappling process of SR VCC and DTF get access to VDN alternately, when VDN changed, the VDN of DTF after being about to change sent to UE.
Three, UE obtains up-to-date VDN or STN-SR by the USSD function from GMLC/LRF or E-RUA, UE satisfy will up-to-date VDN or STN-SR send to MME by Access Network and bring MME/SGSN with up-to-date VDN or STN-SR when the switching in order to MME.
Because urgent call has relation with concrete physical location, therefore the VDN that obtains of MSC or STN-SR and concrete physical location are also relevant, the scheme of the embodiment of the invention can be obtained current VDN or STN-SR when knowing that current calling is emergency call SR VCC.Described current VDN or STN-SR are used for informing MSC at SR VCC handoff procedure, make MSC can finish emergency call SR VCC and switch, thereby realize emergency call SR VCC business effectively.
Fig. 5 is the method flow diagram that the SR VCC of the realization urgent call of the embodiment of the invention three switches.In embodiments of the present invention, comprise the VDN that how to obtain current calling or the method for STN-SR, to finish the SR VCC switching flow of urgent call.As shown in Figure 5, described method comprises:
S501, when judging current calling and being emergency call SR VCC, carry out emergency call SR VCC and handle;
S502, in carrying out described emergency call SR VCC processing procedure, obtain and be used to finish VDN or the STN-SR that emergency call SR VCC switches;
Herein, to obtain current VDN or STN-SR be before the professional handoff request of emergency call SR VCC to MME.
S503, transmission carry the handoff request information of urgent call indication information, switch according to described handoff request information and executing emergency call SR VCC;
Herein, MME is when knowing that current calling is urgent call, and when carrying out SR VCC handoff procedure according to the Handover Required message that the eUTRAN that receives sends, sending the handoff request message that carries the urgent call indication information is emergency call SR VCC switching to MSC with the current calling of notice MSC.Described handoff request message is carried the mode of urgent call indication information can call out the mode that handoff request message is carried the urgent call indication information in the method for switching with reference to the SRVCC of the embodiment of the invention two.
S504, in carrying out the SR VCC handoff procedure of urgent call, receive and come from current VDN or the STN-SR that described MME sends, according to described current VDN or STN-SR current calling is routed to IMS, to realize switching to the objective network side from the current network side.
Alternatively, in the present embodiment, can also be that the SR VCC that MSC carries out urgent call according to handoff request message switches, carry current VDN or STN-SR in the described handoff request message, carry out in the SRVCC urgent call handoff procedure, according to described current VDN or STN-SR current calling is routed to IMS, to realize switching to described objective network side from described current network side.
In embodiments of the present invention, the function that can also SGSN realizes above-mentioned MME, similarly, when inserting (High Speed Packet Access from high-speed packet, when HSPA) VOIP switches to the CS territory of UTRAN/GERAN, can be that SGSN finishes the process of corresponding transmission urgent call indication information to MSC.
Because urgent call has relation with concrete physical location, therefore the VDN that obtains of MSC or STN-SR and concrete physical location are also relevant, present embodiment by obtaining current urgent call VDN or STN-SR and it is informed MSC, make MSC can finish emergency call SR VCC and switch, thereby realize emergency call SR VCC business effectively.
Fig. 6 is an example according to the method for the single connecting system voice continuity of the realization emergency call SR VCC of the embodiment of the invention three.As shown in Figure 6, described method comprises:
Step 601, UE send to eNodeB with measurement report;
Step 602, eUTRAN send Handover Required message informing source MME, carry Source to Target Transparent Container in the message, SRVCC indication parameter;
Step 603a, MME are known when current calling is urgent call, send location information request message Location information Request to GMLC/LRF, carry information such as IMSI, MSISDN in the message;
The prerequisite that this message sends is to have interface between MME and the GMLC/LRF.
Step 603b, GMLC/LRF send location information response message Location informationResponse message to MME, carry current VDN or STN-SR in the message;
Step 604a, the SRVCC indication parameter that sends according to eUTRAN, then MME sends the MSC of Forward relocation Req message to source, carry VDN or STN-SR and Emergency indication that step 3 is obtained in the message, and MSISDN, Source to Target TransparentContainer, parameters such as MM Context;
When step 604b, MSC judge current calling and are urgent call according to the message that receives, send and carry the Prepare HO Req message of urgent indication information to target side MSC;
Step 604c, target side MSC initiate CS relocation flow process.Target side MSC sends RelocationRequest message, carries Source to Target Transparent Container and gives target side RNS.After target side RNS received this information, then Resources allocation was proceeded follow-up CS relocation flow process immediately;
Step 605a, target side RNS send Relocation Request Acknowledge message, carry Target to Source Transparent Container and give target side MSC;
Step 605b, Target MSC send Prepare Handover Response message to MSC Server.
Step 605c, the circuit of setting up between the MGW of target side MSC and MSC server association connect;
Thereby step 606a, MSC judge that according to the emergency indication that sends among the step 604a current is urgent call, then send Map Subscriber Location Report Request message to GMLC/LRF, carry information such as IMSI, IMEI, MSISDN, VMSC address in the message;
Step 606b, GMLC/LRF send the MSC of Map Subscriber Location Report Response message to source;
Step 607-step 611 is with the step 408-step 412 among Fig. 4.
Fig. 7 is another example according to the method for the single connecting system voice continuity of the realization emergency call SR VCC of the embodiment of the invention three.After UE fixed on the IMS territory with call anchor, DTF gave UE with up-to-date VDN or STN-SR information band, and UE sends to MME in order to bring MSC with up-to-date VDN or STN-SR when switching with up-to-date VDN or STN-SR by Access Network then.As shown in Figure 7, described method comprises:
Step 701, set up in the process in urgent call, if realize SRVCC, the audio call that UE initiates just must be anchored on the IMS territory, when UE is anchored on the IMS territory with audio call, the DTF in IMS territory sends to UE with up-to-date VDN or STN-SR, and (if VDN or STN-SR change in the calling procedure, then DTF can send to UE with VDN or the STN-SR after changing.)；
After step 702, UE receive up-to-date VDN or STN-SR, and send it to MME;
Herein, MME brings MSC with up-to-date VDN or STN-SR in follow-up SR VCC handoff procedure, switches in order to follow-up SR VCC.
Next finish SR VCC and call out the flow process of switching such as the step 4-step 11 among Fig. 6.
Correspondingly, the embodiment of the invention also provides and has been used for the network system that SR VCC calls out switching, with according to the urgent call indication information that receives, carries out emergency call SR VCC and switches.
Fig. 8 is that the SR VCC of the embodiment of the invention calls out the structural representation of the network system of switching.With reference to figure 8, comprising: network system 1 comprises mobile services switching centre MSC10, mobile management entity MME 20 and IMS territory 30 in the described network system 1; With Access Network 2, described Access Network 2 comprises current network side 21 and objective network side 22; Described network system 1 comprises:
Described mobile management entity MME 20 is used to send the SR VCC handoff request message that carries the urgent call indication information.
Described mobile services switching centre MSC10 is used to receive the SRVCC handoff request message that carries the urgent call indication information, when knowing the handoff request of the current emergency call SR VCC of being according to described handoff request message, carry out emergency call SR VCC and switch, switch 21 to objective network side 22 from the current network side.
In embodiments of the present invention, described mobile management entity MME 20 is used to inform that by carry the urgent call indication information in sending to the SR VCC handoff request message of mobile services switching centre 10 mobile services switching centre 10 current callings are the switching of emergency call SR VCC, described handoff request message is carried the mode of urgent call indication information, comprises following:
One, carrying the urgent call indication information in the described message, is urgent call to indicate current calling;
Two, described type of message is the emergency call message type, is urgent call to indicate current calling;
Three, VDN in the described message or STN-SR are empty, are urgent call to indicate current calling;
Four, the cell in the described message becomes the expansion cell that carries indicating bit, is urgent call to indicate current calling.
In embodiments of the present invention, described mobile services switching centre 10 also is used to send and carries the described objective network side 22 of handovering information to of described urgent call indication information, is that emergency call SR VCC switches to notify described objective network side 22 current.
The embodiment of the invention informs that by carrying urgent indication information mobile services switching centre 10 current callings are urgent calls, make mobile services switching centre 10 to handle, therefore can satisfy the demand of terminal and network side according to emergency call SR VCC flow process.
In embodiments of the present invention, described network system 1 can also comprise: GMLC or urgent remote subscriber agency are used to send current VDN or STN-SR to MSC10.
Herein, described mobile services switching centre 10 sends the particular location solicited message to GMLC or urgent remote subscriber agency, GMLC or urgent remote subscriber agency send the particular location response message to mobile services switching centre to 10, described particular location response message carries VDN or STN-SR, MSC routes the call to the IMS territory according to current VDN or STN-SR, realizes switching to objective network side 22 from current network side 21.
In embodiments of the present invention, the MME20 of described network system 1 also is used to obtain current VDN or STN-SR and sends to described mobile services switching centre 10, described mobile services switching centre is used for according to described current VDN or STN-SR, route the call to IMS territory 30 according to current VDN or STN-SR, realize realizing switching to objective network side 22 from current network side 21.
Similarly, when switching to the CS territory of UTRAN/GERAN, can be that SGSN finishes the process of corresponding transmission urgent call indication information to MSC from HSPA VOIP.
The network system of the embodiment of the invention is carried urgent indication information and is informed that mobile services switching centre 10 current callings are urgent calls when handoff request, make mobile services switching centre to come treatment S R VCC to switch, satisfy the demand of the SR VCC emergence call service of terminal and network side according to emergency call SR VCC flow process.
Now the network system according to the embodiment of the invention one realizes that emergency call SR VCC switching flow is exemplified below:
UE sends measurement report to source connecting system eUTRAN, if source eUTRAN judges target side network support SR VCC ability, eUTRAN sends Handvoer Required message informing source MME, carry Source to Target Transparent Container in the message, SRVCC indication parameter.
MME can know that current calling is emergency call SR VCC according to the urgent call indication information that the UE that receives sends, or whether MME is that urgent call Qos knows whether current calling is urgent call according to the Qos of voice bearer correspondence in the current calling, can also being MME, (whether Access Point Name APN) belongs to urgent APN (Emergency APN) and knows whether current calling is urgent call according to the Access Point Name of this voice bearer correspondence.If current calling is urgent call, the SR VCC indication information that then described MME sends according to eUTRAN sends transmits handoff request message (Forward relocation Req) to MSC, carrying Emergency Indication parameter in the message, to be used to indicate current calling be urgent call, Emergency Indication parameter mainly is that MME is used to inform that MSC current sessions (the follow-up possibility that may have multiple session, so this indication may be at one of them session) is urgent call.Also carry VDN, MSISDN in the described message, Source to Target Transparent Container, parameters such as MM Context.
When MSC judges that according to the information that receives current calling is urgent call, send Prepare HO Req message to target side MSC, carry Emergency Indication parameter in the message and give target side MSC, the MSC of notification target side does the urgent call resource and prepares.
Target side MSC initiates CS relocation flow process.Target side MSC sends Relocation Request message, carries Source to Target Transparent Container parameter and EmergencyIndication information in the message and gives target side RNS, and notification target side RNS does the urgent call resource and prepares;
Target side RNS sends position migration acknowledge message Relocation Request Acknowledge, carries Target to Source Transparent Container in the message and gives target side MSC.Send the MSC 10 of Prepare Handover Response message after the MSC receiving position migration acknowledge message of target side to source.The circuit that the MSC10 of source is initiated to target side MSC connects, and the circuit of setting up target side MSC and source MSC10 is connected.
It is urgent call that MSC judges current calling according to the Emergency indication parameter of carrying in the forwarding handoff request message that receives, therefore, send Subscriber Location Report request Map Subscriber LocationReport Request message to GMLC/LRF, carry information such as IMSI, IMEI, MSISDN, VMSCaddress in the message.GMLC/LRF sends the MSC10 of Map Subscriber Location Report Response message to source.After MSC learnt the customer position information of current calling, switched in the territory that is initiated to the IMS territory, upgrades access leg, and this moment, voice packet was received and dispatched from the CS territory.
MSC sends and transmits migration response Forward Relocation Response message to MME, carries Target to Source Transparent Container in the message.MME2 sends Handover Command message to source eUTRAN, carries Target to Source Transparent Container in the message.EUTRAN sends Handover from eUTRAN Command message to UE, impels UE to switch to aiming field.
In embodiments of the present invention, also provide the embodiment of another kind of network system, described network system can be obtained VDN or the STN-SR in the emergency call SR VCC business.Described network system comprises mobile management entity or GPRS service support point, when described mobile management entity or GPRS service support point are used to judge current calling and are emergency call SR VCC, carrying out emergency call SR VCC handles, and in carrying out emergency call SR VCC processing procedure, obtain and be used to finish VDN or the STN-SR that promptly exhales SR VCC to switch.In embodiments of the present invention, mobile management entity or GPRS service support point obtain current VDN or STN-SR, and when carrying out SR VCC switching, described current VDN or STN-SR are sent to described mobile services switching centre, make MSC current calling be routed to the IMS territory to realize the switching from the current network side to the objective network side according to current VDN or STN-SR.
Alternatively, in embodiments of the present invention, described network system also comprises: described urgent remote subscriber is acted on behalf of E-RUA or GMLC GMLC.
Described mobile management entity or GPRS service support point: know when current calling is urgent call that send a request message (for example location request message) acts on behalf of E-RUA or GMLC GMLC for described urgent remote subscriber;
After described urgent remote subscriber is acted on behalf of E-RUA or GMLC GMLC reception described request message, transmission carries the response message (correspondingly, being the position response message) of current VDN or STN-SR and gives described mobile management entity or GPRS service support point.
Alternatively, in embodiments of the present invention, described network system, also comprise: domain-functionalities entity DTF and terminal UE, set up in the process at emergency call SR VCC, described domain-functionalities entity DTF sends to terminal with up-to-date VDN or STN-SR, if VDN or STN-SR change in the calling procedure, then DTF can send to UE with VDN or the STN-SR after changing;
Herein, UE can be by sending IMS domain signaling 200OK message to DTF, and described DTF sends to UE with current VDN or STN-SR.Can also be UE after the registration of IMS territory, UE in the professional grappling process of SR VCC and DTF get access to VDN alternately, when VDN changed, the VDN of DTF after being about to change sent to UE.
Described current VDN that described terminal will receive or STN-SR send to described mobile management entity or GPRS service support point.
Alternatively, in embodiments of the present invention, described network system also comprises: GMLC or E-RUA and terminal,
Described terminal is used for obtaining current VDN or STN-SR by non-structural supplementary data USSD business from described GMLC or E-RUA, and described current VDN or STN-SR are sent to described mobile management entity or GPRS service support point.
After obtaining current VDN or STN-SR, MME/SGSN sends to MSC by in carrying out emergency call SR VCC handoff procedure with current VDN or STN-SR, realizes SRVCC urgent call processing, switches to the objective network side from the current network side.
Because urgent call has relation with concrete physical location, therefore the VDN that obtains of MSC or STN-SR and concrete physical location are also relevant, present embodiment is informed MSC by VDN or the STN-SR that obtains current calling, makes MSC can more effectively realize emergency call SR VCC.
Correspondingly, the embodiment of the invention also provides a kind of mobile services switching centre.With reference to figure 9, described mobile services switching centre 10 comprises:
Receiving element 101 is used to receive the SR VCC handoff request message that carries the urgent call indication information;
Processing unit 103 is used for handling according to the SR VCC switching message of described urgent call indication information, carries out emergency call SR VCC and switches.
The MSC of the embodiment of the invention can realize emergency call SR VCC business, finishes the voice continuity between circuit domain/CS territory and packet domain/PS territory.
Correspondingly, the embodiment of the invention also provides a kind of device, and with reference to Figure 10, described device comprises: judging unit 201 is used to judge whether current calling is emergency call SR VCC; With transmitting element 202, be used for when described judging unit 201 is judged current calling and is emergency call SR VCC, send carry the urgent call indication information emergency call SR VCC handoff request message to mobile services switching centre.
In the present embodiment, the mode that the emergency call SR VCC handoff request message that described transmitting element 202 sends is carried the urgent call indication information comprises following:
Carrying the urgent call indication information in described message, is urgent call to indicate current calling;
Described type of message is the emergency call message type, is urgent call to indicate current calling;
VDN or STN-SR are empty in described message, are urgent call to indicate current calling;
Cell in the described message is the expansion cell that carries indicating bit, is urgent call to indicate current calling.
The device of the embodiment of the invention can be a mobile management entity, can also be GPRS service support point SGSN.The mobile management entity of the embodiment of the invention can be the information of urgent call for MSC provides the current calling of indication, thereby makes network system can realize emergency call SR VCC.Described SGSN, when inserting (High Speed Packet Access from high-speed packet, when HSPA) VOIP switches to the CS territory of UTRAN/GERAN, can be that (Serving GPRS Supporting Node SGSN) finishes the process of corresponding transmission urgent call indication information to MSC to GPRS service support point.In embodiments of the present invention, described device can also comprise: information acquisition unit 203, be used to obtain current VDN or the STN-SR of described emergency call SR VCC, described transmitting element 202 also is used for described current VDN or STN-SR are sent to mobile services switching centre.Wherein, described information acquisition unit 203 VDN or the STN-SR that obtain current calling comprises following mode:
Know when current calling is urgent call, send a request message act on behalf of E-RUA or GMLC GMLC to urgent remote subscriber after, receive the response message that carries VDN or STN-SR that described E-RUA or GMLC/LRF send;
Herein, for example information acquisition unit 203 sends location information request message to GMLC, and GMLC returns the location information response message that carries VDN or STN-SR accordingly.
Current VDN or STN-SR that receiving terminal sends, current VDN or STN-SR are that the DTF in IMS territory sends to terminal;
Reception comes from VDN or the STN-SR that terminal sends.
Herein, in the SRVCC urgent call processing procedure, UE obtains up-to-date VDN or STN-SR by the USSD function from GMLC/LRF or E-RUA, UE satisfy will up-to-date VDN or STN-SR send to MME by Access Network and bring MME with up-to-date VDN or STN-SR when the switching in order to MME.
The device of the embodiment of the invention can be provided for finishing VDN or the STN-SR that emergency call SR VCC switches for MSC, thereby makes network system can realize emergency call SR VCC business.
At last, one of ordinary skill in the art will appreciate that all or part of step that realizes in the foregoing description method is to finish by the relevant hardware of program command, affiliated program can be stored in the computer-readable recording medium, this program comprises following all or part of step when carrying out:
Reception carries the handoff request message of urgent call indication information;
Know the current handoff request of emergency call SR VCC that is according to described handoff request message, carry out emergency call SR VCC and switch, switch to the objective network side from the current network side.
Need to prove, realize the SR VCC business of urgent call on the network architecture that the present invention is not limited to provide in an embodiment, can realize the network system of VCC business, all can be regarded as and can realize emergency call SR VCC business; Correspondingly, the present invention also is not limited to the emergency call SR VCC that provides in an embodiment and switches to UTRAN network or GERAN network from the eUTRAN network, can also be other networks.
The above is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also are considered as protection scope of the present invention.

Claims (21)

1, a kind of voice continuous call switching method is characterized in that, comprising:
Reception carries single connecting system voice continuity SR VCC handoff request message of urgent call indication information;
Know the current emergency call SR VCC handoff request that is according to described handoff request message, carry out emergency call SR VCC and switch, switch to the objective network side from the current network side.
2, method according to claim 1 is characterized in that, described handoff request message is carried the mode of urgent call indication information, comprises one of following:
Carrying the urgent call parameter in the described handoff request message is urgent call to indicate current calling;
Described handoff request type of message is that particular message type is urgent call to indicate current calling;
Voice continuity VCC territory translation number VDN in the described handoff request message or SR VCC session Handover Number STN-SR are urgent call for sky to indicate current calling;
It is urgent call to indicate current calling that the cell expansion of described handoff request message has indicating bit.
3, method according to claim 1, it is characterized in that, described method also comprises: when mobile management entity or GPRS service support point are judged current calling and be emergency call SR VCC, send the described SR VCC handoff request message that carries the urgent call indication information; It is emergency call SR VCC that described mobile management entity or GPRS service support point are judged current calling, comprises one of following mode:
Know that according to the urgent call indication information that comes from terminal current calling is emergency call SR VCC;
Whether the Qos according to voice bearer correspondence in the current calling is that urgent call Qos knows whether current calling is emergency call SR VCC;
Whether belong to urgent APN according to the corresponding Access Point Name APN of carrying in the current calling and know whether current calling is urgent call.
4, method according to claim 1 is characterized in that, described method also comprises:
The SRVCC that transmission carries described urgent call indication information handovers information to described objective network side.
5, according to the described method in one of claim 1 or 4, it is characterized in that, carry current VDN or STN-SR in the described handoff request message, described execution emergency call SR VCC switches, and switches to the objective network side from the current network side, comprising:
When carrying out emergency call SR VCC switching, switch to described objective network side from described current network side according to described current VDN or STN-SR.
According to the described method in one of claim 1 or 4, it is characterized in that 6, described execution emergency call SR VCC switches, and switches to the objective network side from the current network side, comprising:
In carrying out emergency call SR VCC handoff procedure, obtain current VDN or STN-SR, switch to described objective network side according to described current VDN or STN-SR from described current network side.
7, method according to claim 6 is characterized in that, described current VDN or the STN-SR of obtaining comprises:
Receive described urgent remote subscriber and act on behalf of the message that carries current VDN or STN-SR of E-RUA or GMLC GMLC transmission; Or
Receive current VDN or STN-SR that mobile management entity or GPRS service support point send.
8, a kind of method is characterized in that, comprising:
When judging current calling and being emergency call SR VCC, carry out emergency call SR VCC and handle;
In carrying out described emergency call SR VCC processing procedure, obtain the VDN or the STN-SR that are used to finish emergency call SR VCC switching.
9, method according to claim 8 is characterized in that, described obtaining is used to finish VDN or the STN-SR that emergency call SR VCC switches, and comprises one of following mode:
Receive described urgent remote subscriber and act on behalf of the response message that carries current VDN or STN-SR of E-RUA or GMLC GMLC transmission;
Reception comes from VDN or the STN-SR that terminal obtains from territory handoff functionality DTF;
Reception comes from VDN or the STN-SR that terminal obtains from GMLC or E-RUA by non-structural supplementary data USSD business.
10, a kind of network system is characterized in that, comprising:
Mobile management entity or GPRS service support point are used to send the SR VCC handoff request message that carries the urgent call indication information;
Mobile services switching centre, be used to receive the SR VCC handoff request message that carries the urgent call indication information, when knowing current handoff request for emergency call SR VCC according to described handoff request message, carry out emergency call SR VCC and switch, switch to the objective network side from the current network side.
11, network system according to claim 10 is characterized in that:
Described mobile services switching centre also is used to send the SRVCC that carries described urgent call indication information and handovers information to described objective network side.
12, according to claim 10 or 11 described network systems, it is characterized in that, also comprise:
GMLC GMLC or urgent remote subscriber are acted on behalf of E-RUA, are used to send VDN or STN-SR to described mobile services switching centre;
Described mobile services switching centre is used for according to described VDN or STN-SR, switches to described objective network side from described current network side.
13, according to claim 10 or 11 described network systems, it is characterized in that:
Described mobile management entity or GPRS service support point also are used to obtain VDN or STN-SR and send to described mobile services switching centre;
Described mobile services switching centre also is used for according to described VDN or STN-SR, switches to described objective network side from described current network side.
14, a kind of network system comprises mobile management entity or GPRS service support point, it is characterized in that:
When mobile management entity or GPRS service support point are used to judge current calling and are emergency call SR VCC, carrying out emergency call SR VCC handles, and in carrying out emergency call SR VCC processing procedure, obtain and be used to finish VDN or the STN-SR that promptly exhales SR VCC to switch.
15, network system according to claim 14 comprises that also urgent remote subscriber acts on behalf of E-RUA or GMLC GMLC, it is characterized in that:
Described mobile management entity or GPRS service support point also are used to send location information request message to described E-RUA or GMLC;
Described E-RUA or GMLC are used for sending and carrying the location information response message of current VDN or STN-SR to described mobile management entity or GPRS service support point according to the described location information request message that receives.
16, network system according to claim 14 also comprises domain-functionalities entity DTF and terminal, it is characterized in that:
Described domain-functionalities entity DTF is used for current VDN or STN-SR are sent to described terminal;
Described current VDN or STN-SR that described terminal is used for receiving send to described mobile management entity or GPRS service support point.
17, network system according to claim 14 also comprises GMLC and terminal, and perhaps, E-RUA and terminal is characterized in that:
Described terminal is used for obtaining current VDN or STN-SR by non-structural supplementary data USSD business from described GMLC or E-RUA, and described current VDN or STN-SR are sent to described mobile management entity or GPRS service support point.
18, a kind of mobile services switching centre is characterized in that, comprising:
Receiving element is used to receive the SR VCC handoff request message that carries the urgent call indication information;
Processing unit is used for carrying out emergency call SR VCC according to the described SR VCC handoff request message that carries the urgent call indication information and switches.
19, a kind of device is characterized in that, comprising:
Judging unit is used to judge whether current calling is emergency call SR VCC;
Transmitting element is used for going out current calling when being emergency call SR VCC when described judgment unit judges, send carry the urgent call indication information emergency call SR VCC handoff request message to mobile services switching centre.
20, device according to claim 19 is characterized in that, described device also comprises:
Information acquisition unit is used to obtain current VDN or the STN-SR of described emergency call SR VCC;
Described transmitting element also is used for described current VDN or STN-SR are sent to described mobile services switching centre.
21, device according to claim 19 is characterized in that, described device is mobile management entity or GPRS service support point.
CN200810198084A 2008-08-28 2008-08-28 Voice continuous call switching method and system and mobile service switching center Pending CN101662756A (en)

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