CN102238679B - Single radio voice call continuity realization method and system - Google Patents

Abstract

The invention discloses a kind of single radio voice call continuity realization method and system.The method comprises: UTRAN or GERAN notifies that eMSC prepares UE to be switched to PS territory network by CS territory network; Does eMSC determine that this UE exists CS speech business and PS data service simultaneously, the MME of notice PS territory network? there is CS speech business and PS data service in UE simultaneously; MME is after CS to the PS handover request message receiving this UE and PS to PS handover request message, and the network element of notice PS territory network is this UE preparation Internet resources; MME is switched to PS territory network by CS territory network advertisement UE; After UE is switched to PS territory network, be the media data between the network resource transmission UE of UE preparation and far-end by PS territory network.By the present invention, make the CS speech business of UE and PS data service can synchronism switching.

Description

Single radio voice call continuity realization method and system

Technical field

The present invention relates to the communications field, in particular to a kind of single radio voice call continuity realization method and system.

Background technology

Fig. 1 is the grouping domain system (EvolvedPacketSystem of evolution, referred to as EPS) Organization Chart, comprise: global system for mobile communications wireless access network (the EvolvedUniversalMobileTelecommunicationSystemRadioAccess Network of evolution, be called for short E-UTRAN or EUTRAN), mobile management entity (MobilityManagementEntity, referred to as MME), service gateway entity (ServingGateway, referred to as S-GW); Packet data network gateway (PacketDataNetworkGateway, referred to as PDNGW or P-GW), Serving GPRS Support Node (ServingGPRSSupportingNode, referred to as SGSN), charging and policy control entity (PolicyandChargingRuleFunction, referred to as PCRF) and home network server (HomeSubscriberServer, HSS).Wherein, P-GW and S-GW may close and be located in a physical entity.

Fig. 2 is single radio voice call continuity in correlation technique (SingleRadioVoiceCallContinuity, referred to as SRVCC) system architecture diagram.Wherein, UTRAN/GSMEDGE wireless access network (GSMEDGEradioaccessnetwork, referred to as GERAN) is mainly used in as 3G/2G circuit switching (CircuitSwitch, referred to as CS) territory network insertion; E-UTRAN is mainly used in packet switching (PacketSwitch, referred to as PS) territory network insertion; Source mobile switching centre (SourceMobileSwitchCenter, referred to as SourceMSC) is mainly used in user in source circuit switching network user face and signaling function of exchange; Strengthen mobile switching centre (enhancedMobileSwitchCenter, referred to as eMSC), for helping single channel (SingleRadio, referred to as SR) UE to complete voice continuity between CS territory and PS territory, this network element can be deployed as same network element with SourceMSC.

IP Multimedia System (IPMultimediaCoreNetworkSubsystem, referred to as IMS) network element is related network elements in IMS business system, in IMS business system, key-course is separated with operation layer, key-course does not provide concrete business, only provide the necessary function such as triggering, route, charging to operation layer, in key-course, business triggering and controlling functions are that CSCF (CallSessionControlFunction, referred to as CSCF) completes.CSCF is divided into: Proxy Call Session Control Function (Proxy-CSCF, referred to as P-CSCF), query call conversation control function (Interrogating-CSCF, referred to as I-CSCF) and service call conversation control function (Serving-CSCF, referred to as S-CSCF) three types.And operation layer is made up of a series of application server (ApplicationServer, referred to as AS), can provide concrete business service, AS can be independently entity, also may reside in S-CSCF.

Fig. 3 is that in correlation technique, single channel voice business continuity is switched to the flow chart of PS territory (can be called reverse switching) from CS territory, describe SRUE and first set up session at circuit commutative field network and far-end, signaling and business are anchored on IMS network, the follow-up generation single radio voice call continuity of SRUE, SRUE is from Long Term Evolution (Long-TermEvolution, referred to as LTE) network insertion, re-establish and be connected with distant end media, keep session continuous print process, comprise the steps:

301, the wireless measurement that GERAN/UTRAN network reports according to SRUE is reported, determines to initiate to switch to E-UTRAN;

302, GERAN/UTRAN sends handover request message (HORequired) to SourceMSC, carries the Target Cell Identifier pointing to target E-UTRAN network in message;

303, SourceMSC sends switching according to Target Cell Identifier in message to eMSC and prepares message (PrepareHORequest), and notification target network switches;

304, eMSC judges that SRUE does not exist Internet resources in target E-UTRAN network, judges whether to possess Internet resources, and eMSC can inquire about to objective network MME, or inquires about at device interior.

305, eMSC returns to switch to SourceMSC and prepares response message (PrepareHOResponse), network insertion instruction (NetworlAccessIndicator is carried in message, NAI), by this instruction notice SRUE in E-UTRAN network insertion New-deployed Network resource, to complete switching;

306, SourceMSC returns handover acknowledge message (HOResponse) to source GERAN/UTRAN network, carries network insertion instruction in message;

307, source GERAN/UTRAN sends switching command (HOCommand) and notifies that SRUE switches.Carry network insertion instruction in message, instruction UE is linked into E-UTRAN network, and New-deployed Network resource completes switching;

308, SRUE receives switching command, according to network insertion instruction, is switched to E-UTRAN network, and initiates standard-track area update flow process (TrackingAreaUpdate, referred to as TAU);

Because SRUE is switched to E-UTRAN network, therefore, from now, between SRUE and GERAN/UTRAN, the connection of user face is ruptured, and the voice between SRUE and far-end temporarily cannot communication.

309, SRUE sets up required carrying at E-UTRAN network, and process of establishing is standard P S loading establishing process, is not described in detail here;

310, after carrying is set up, SRUE registers to user ascription area IMS network;

311, succeed in registration, SRUE sends session invitation message (INVITE) to user ascription area IMS network, message carries the Session Hand-off instruction (SessionTransferIndication of static configuration in UE inside, referred to as STI), this session of instruction IMS network element is used for business continuance (ServiceContinuity, referred to as SC).IMS network element, by upgrading far-end flow process, makes original IP media connect to be connected to SourceMSC by far-end to be updated to and to be directly connected with SRUE, some EPS network elements of middle possible approaches and other network equipments.This step is the SC flow process of standard, does not describe in detail here;

312, after far-end is updated successfully, IMS network element returns success message (200OK) to SRUE.After SRUE receives 200Ok message, recover the speech communication between far-end, complete SRUE and switch voice continuity between CS and PS.

Inventor finds, in above-mentioned single channel voice business continuity implementation method, if SRUE is current also have PS territory business, then GERAN/UTRAN also needs notice SGSN to switch, SGSN receives notice, PStoPS handover request will be sent to MME, MME is after receiving this handover request, perform the switching of PS to PS, due to the switching of CS to the PS of SRUE and the switching of PS to PS separate, thus by causing the switching of the CS territory business of SRUE and PS territory business asynchronous, reduce the experience of user.

Summary of the invention

Main purpose of the present invention is to provide a kind of single radio voice call continuity realization method and system, at least one of to solve the problem.

According to an aspect of the present invention, provide a kind of single radio voice call continuity realization method, comprising: UTRAN or GERAN notifies that eMSC prepares UE to be switched to PS territory network by CS territory network; EMSC determines that this UE exists CS speech business and PS data service simultaneously, and the MMEUE of notice PS territory network exists CS speech business and PS data service simultaneously; MME is after CS to the PS handover request message receiving this UE and PS to PS handover request message, and the network element of notice PS territory network is this UE preparation Internet resources; MME is switched to PS territory network by CS territory network advertisement UE; After UE is switched to PS territory network, be the media data between the network resource transmission UE of UE preparation and far-end by PS territory network.

According to a further aspect in the invention, provide a kind of single radio voice call continuity and realize system, comprising: UTRAN or GERAN, for notifying that eMSC prepares UE to be switched to PS territory network by CS territory network; EMSC, for judging whether this UE exists CS speech business and PS data service simultaneously, if so, then notifies that this UE of MME of PS territory network exists CS speech business and PS data service simultaneously; MME, for indicating after UE exists the notice of CS speech business and PS data service receiving eMSC simultaneously, after PS to the PS handover request message of CS to the PS handover request message and this UE that receive this UE, the network element of notice PS territory network is this UE preparation Internet resources, after being switched to PS territory network to make UE, by the media data that PS territory network is between the network resource transmission UE of this UE preparation and far-end, and MME is also for being switched to PS territory network by CS territory network advertisement UE.

Pass through the present invention, UTRAN/GERAN in the CS territory preparing to initiate single channel UE to the switching in PS territory time, notice is sent to eMSC, eMSC is after receiving notice, judge whether this UE exists CS speech business and PS data service simultaneously, if, the then MME of notification target network, the MME of objective network is after receiving the notice of eMSC, after CS to PS (CStoPS) the handover request message receiving this UE and PS to PS (PStoPS) handover request, just the network element of notification target network is that UE prepares Internet resources, then notify that UE is switched to objective network, thus make the CS speech business of UE and PS data service can synchronism switching, and, due to objective network before UE is switched to objective network for UE has prepared Internet resources, thus speech interruption time in handoff procedure can be reduced, further raising Consumer's Experience.

Accompanying drawing explanation

Accompanying drawing described herein is used to provide a further understanding of the present invention, and form a application's part, schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:

Fig. 1 is EPS configuration diagram in correlation technique;

Fig. 2 is the single radio voice call continuity Organization Chart in correlation technique;

Fig. 3 is the flow chart that in correlation technique, single mode voice business continuity switches packet-switched domain from circuit commutative field;

Fig. 4 is the structural representation realizing system according to the single radio voice call continuity of the embodiment of the present invention one;

Fig. 5 is the configuration diagram that the another kind of single radio voice call continuity of the embodiment of the present invention one realizes system;

Fig. 6 is the flow chart of the single radio voice call continuity realization method according to the embodiment of the present invention one;

Fig. 7 is the signaling process figure according to the embodiment of the present invention two;

Fig. 8 is the signaling process figure according to the embodiment of the present invention three.

Embodiment

Hereinafter also describe the present invention in detail with reference to accompanying drawing in conjunction with the embodiments.It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.

Embodiment one

Fig. 4 is the structural representation realizing system according to the single radio voice call continuity of the embodiment of the present invention one, comprising: the MME30 of UTRAN/GERAN10, eMSC20 and objective network (i.e. PS territory network).Wherein, UTRAN/GERAN10, for notifying that eMSC20 prepares UE to be switched to PS territory network (i.e. objective network) by CS territory network; EMSC20, for judging whether UE exists CS speech business and PS data service simultaneously, if so, then notifies that this UE of MME30 exists CS speech business and PS data service simultaneously; MME30 is used for indicating after UE exists the notice of CS speech business and PS data service simultaneously receiving eMSC20, after PS to the PS handover request message of CS to the PS handover request message and this UE that receive this UE, the network element of notice PS territory network is this UE preparation Internet resources, after being switched to PS territory network to make UE, by the media data that PS territory network is between its network resource transmission UE prepared and far-end, further, by CS territory network (i.e. source network), MME30 is also for notifying that UE is switched to PS territory network.

Due in correlation technique perform SRUE from CS territory to the switching in PS territory time, if SRUE is current also have PS territory business, the switching of CS to the PS of SRUE and the switching of PS to PS are separate, thus will the switching of the CS territory business of SRUE and PS territory business be caused asynchronous.And in the said system that the present embodiment provides, UTRAN/GERAN10 in the CS territory preparing to initiate single channel UE to the switching in PS territory time, notice is sent to eMSC20, eMSC20 is after receiving notice, judge whether this UE exists CS speech business and PS data service simultaneously, if, the then MME30 of notification target network, the MME30 of objective network is after receiving the notice of eMSC, after the CStoPS handover request message receiving this UE and PStoPS handover request, just the network element of notification target network is that UE prepares Internet resources, then notify that UE is switched to objective network, thus make the CS speech business of UE and PS data service can synchronism switching, and, due to objective network before UE is switched to objective network for UE has prepared Internet resources, thus speech interruption time in handoff procedure can be reduced.

Source MSC does not have enhancing ability in a preferred embodiment of the invention, communicated by source MSC between UTRAN/GERAN10 and eMSC20, therefore, said system also comprises source MSC, Fig. 5 is that the another kind of single radio voice call continuity of the present embodiment realizes system architecture schematic diagram, this system also comprises: source MSC40, accesses objective network by E-UTRAN, also comprises the network elements such as S-GW/P-GW and PCRF in objective network (i.e. PS territory network).

In the present embodiment, UTRAN/GERAN10 is when notifying that eMSC20 prepares UE to be switched to PS territory network, UTRAN/GERAN10 can also judge whether this UE exists CS speech business and PS data service simultaneously, and when notifying that eMSC20 prepares UE to be switched to PS territory network, judged result is informed to eMSC20, according to this judged result, eMSC20 can judge whether UE exists CS speech business and PS data service simultaneously.Or, according to the notice of SGSN, eMSC20 also can judge whether UE exists CS speech business and PS data service simultaneously, such as, when UE SGSN initiate or end data business time, when SGSN can notify that UE is registered in SGSN, whether the eMSC20 current UE of combined registering initiates data service, according to the notice of SGSN, eMSC20 can determine whether UE exists CS speech business and PS data service simultaneously.

Fig. 6 is the flow chart of the single radio voice call continuity realization method according to the embodiment of the present invention one, mainly comprises the following steps (step S602-step S610):

Step S602, UTRAN/GERAN notify that eMSC prepares UE to be switched to PS territory network by CS territory network;

Such as, source MSC is the MSC (i.e. eMSC) of enhancement mode, then the wireless measurement that UTRAN/GERAN reports according to UE is reported, determines that initiating access between network switches, and prepares to switch this UE to PS territory network to eMSC transmission handover request message informing eMSC; Source MSC is the MSC of non-reinforcing type, the wireless measurement that then UTRAN/GERAN reports according to UE is reported, determine that initiating access between network switches, handover request message is sent to source MSC, the target cell information that source MSC carries according to handover request, sends to eMSC and switches this UE to PS territory network of preparation message informing eMSC preparation switching.

Step S604, eMSC determine that this UE exists CS speech business and PS data service simultaneously, and this UE of MME of notice PS territory network exists CS speech business and PS data service simultaneously;

Such as, UTRAN/GERAN is when preparing to switch UE to PS territory network, UTRAN/GERAN can judge whether this UE exists CS speech business and PS data service simultaneously, when notifying that eMSC prepares to switch UE to PS territory network, judged result is informed to eMSC, such as, the business sign being used to indicate UE and whether existing simultaneously CS speech business and PS data service can be carried in above-mentioned handover request message and send to eMSC by UTRAN/GERAN, eMSC is according to the instruction of this business sign, can determine whether UE exists CS speech business and PS data service simultaneously,

Or UE is when SGSN initiates or terminate PS data service, and SGSN can send notice to the eMSC of this UE combined registering when being registered in SGSN, according to this notice, eMSC can determine whether UE exists CS speech business and PS data service simultaneously.

Such as, by carrying business sign in the CStoPS handover request message sent to MME, eMSC can notify whether this UE of MME exists CS speech business and PS data service simultaneously, such as, a bit can be taken indicate, if the value of this bit is 1, then indicate UE to there is CS speech business and PS data service simultaneously; Or eMSC also can send a special notification message to MME, indicates this UE of MME whether to there is CS speech business and PS data service by this notification message simultaneously.

Step S606, MME are after PS to the PS handover request message of CS to the PS handover request message and UE that receive UE, and the network element of notice PS territory network is that UE prepares Internet resources;

Because UE exists CS speech business and PS data service simultaneously, therefore, MME, after PS to the PS handover request message of CS to the PS handover request message and UE that receive this UE, just notifies that the network element of PS territory network is that UE prepares Internet resources.If eMSC notifies that UE does not exist PS data service, then namely MME notifies that after receiving CStoPS handover request the network element of PS territory network is that UE prepares Internet resources.Such as, according to following steps, MME can notify that the network element of PS territory network is that UE prepares Internet resources:

Step 1, MME obtains the user profile of UE, selects the S-GW of PS territory network according to user profile;

Wherein, MME can obtain the user profile of UE in such a way: (1) MME obtains the user profile of local this UE preserved; (2) MME parses the user profile of this UE handover request message from PS to PS, from the contextual information of UE, namely parse the user profile of this UE; (3) MME obtains the user profile of this UE to the home network server of UE according to the mark of UE.

Step 2, MME sends to S-GW and creates conversation request message, and request creates the default bearer of UE;

Wherein, carry the contextual information of described UE in PS to the PS handover request message that MME receives, in this contextual information, include the mark of the default bearer of this UE;

Step 3, described S-GW is that described default bearer distributes bearing resource, returns and creates session request-reply message, carry the IP address of described UE in this establishment session request-reply message to described MME;

Step 4, described MME sends handover request message to the UTRAN of evolution, notifies that the UTRAN of described evolution distributes the interface-free resources of described default bearer;

Step 5, the handover acknowledge message that the UTRAN that described MME receives described evolution returns, wherein, carries the access parameter of described interface-free resources in described handover acknowledge message.

Step S608, MME are switched to PS territory network by CS territory network advertisement UE;

Such as, MME can send CStoPS handover acknowledge Messages Message to eMSC, the access parameter of the interface-free resources that objective network distributes can be carried in this message, eMSC upon receiving the message, can return to switch to source MSC or direct UTRAN/GERAN and prepare response message, this switching prepares the access parameter carrying above-mentioned interface-free resources in response message, finally send switching command message by UTRAN/GERAN to UE, the access parameter of above-mentioned interface-free resources is carried in this switching command message, notice UE is switched to objective network, after UE receives switching command message, access parameter according to above-mentioned interface-free resources is linked into objective network.

After step S610, UE are switched to PS territory network, be the media data between the above-mentioned network resource transmission UE of UE preparation and far-end by PS territory network.

Such as, one section of interim media can be set up connect between UE and eMSC, after UE is switched to PS territory network, before IMS distant end media is updated successfully, media data between transmission UE and far-end can be connected by these media.Such as, can initiatively initiate to set up these media by UE and connect, also initiatively can be initiated by eMSC.The time of the dropped calls between UE and far-end can be reduced like this.

Or, also can not set up interim media to connect between UE and eMSC, but according to the flow performing shown in Fig. 3, perform the step after step 307, be with the difference of the flow process shown in Fig. 3, in the present embodiment, because objective network is for UE sets up default bearer, therefore, do not need to perform step 309 again.Thus the time of the communicating interrupt of UE and far-end can be reduced.

By the above-mentioned single radio voice call continuity realization method of the present embodiment, eMSC is when the MME of notification target network prepares to switch UE to PS territory network, whether this UE of notice MME exists PS data service and CS speech business simultaneously, if, then MME is after the CStoPS handover request message receiving this UE and PStoCS handover request message, just the network element of request target network is UE allocation of network resources, and reinform UE and be switched to PS territory after Resource Allocation in Networks success, thus the CS speech business of UE and the synchronism switching of PS data service can be ensured.

Embodiment two

Described by the present embodiment is that SRUE when the speech business of circuit for generating territory and PS domain data service, is switched to the flow process of PS territory network GERAN/UTRAN network while.Fig. 7 is the signaling process figure of the present embodiment, the measurement report that GERAN/UTRAN reports according to SRUE, determines that initiating access network switches, and sends handover request message to source MSC, mainly comprises the following steps:

The wireless measurement report that 701.GERAN/UTRAN reports according to SRUE, determines that initiating access between network switches;

702.GERAN/UTRAN perception SUUE initiates CS speech business and PS data service at this network simultaneously, handover request message is sent to source MSC, in this message, target address location community is network cell, target P S territory, and, also carry PS business sign in this message, this PS business sign is used to indicate this UE and has initiated CS speech business and PS data service at source network simultaneously;

703.GERAN/UTRAN sends handover request message to SGSN simultaneously;

After 704. source MSC receive handover request message, eMSC is selected according to target cell information, send to switch to eMSC and prepare message, cell-of-origin and target cell information, PS business sign and User Identity (such as IMSI) is carried in message, if source MSC judges there is the current resident SGSN address of UE in this equipment, then SGSN address is also carried within the message;

705.eMSC receives to switch and prepares message, according to Target cell, select MME, CStoPS handover request message is sent to this MME, cell-of-origin and target cell information, PS business sign and User Identity is carried (such as in this message, IMSI), if the switching received prepares to carry SGSN address in message, then also this SGSN address is carried in CStoPS handover request message.

Wherein, if if source MSC and eMSC is same entity, then do not need to transmit the message between above-mentioned source MSC and eMSC;

706.SGSN sends PStoPS handover request message to MME, carries the contextual information of UE, include the mark of the default bearer of UE in this contextual information in this message;

707-708.MME judges whether carry PS business sign in the CStoPS handover request message received, if, then MME is after receiving the PStoPS handover request message of step 706, select S-GW/P-GW, the default bearer indicated by mark in the contextual information in request S-GW/P-GW foundation step 706;

After the default establishment of 709.MME, according to target cell information select target EUTRAN, send handover request message to target EUTRAN, notice EUTRAN distribute interface-free resources, and message carries the link address of the default bearer S-GW user face connection EUTRAN that 707-708 creates.After EUTRAN distribution interface-free resources completes, set up media between EUTRAN and S-GW and connect, return handover acknowledge message to MME, in message, carry distributed interface-free resources access parameter;

710.MME returns CStoPS handover acknowledge message to eMSC, carries the IP address of EUTRAN interface-free resources access parameter and UE in message;

711. simultaneously, and MME returns PStoPS handover acknowledge message to SGSN, carries the access parameter of the interface-free resources that E-UTRAN distributes in this message;

712.SGSN returns handover acknowledge message to GERAN/UTRAN;

After 713.eMSC receives CStoPS handover acknowledge message, divide and be used in the IP address, user face and port numbers that between eMSC and SRUE, media connect, and generate speech business flow template (TrafficFlowTemplate according to receiving UEIP address, referred to as TFT), this template is used to indicate UE with eMSC and sets up media between SRUE and eMSC and be connected, and receives/send voice medium by these voice TFT;

Wherein, voice TFT comprises UE side and IP address, eMSC side and port numbers, and UE side ports arranges the default value of network provision;

714.eMSC returns to switch and prepares response message to SourceMSC, and carry the TFT that 713 steps generate in message, user sets up the Handover Number of CS carrying, and EUTRAN eats dishes without rice or wine access parameter;

715. source MSC receive to switch and prepare response message, set up CS carrying between SourceMSC and eMSC according to Handover Number;

716. source MSC return handover acknowledge message to GERAN/UTRAN, carry EUTRAN and eat dishes without rice or wine access parameter and TFT in message;

717.GERAN/UTRAN receives the handover acknowledge message from SGSN and source MSC simultaneously, and by switching command message, notice SRUE switches, and carries EUTRAN and eat dishes without rice or wine access parameter and TFT in message;

718.SRUE is switched to EUTRAN network according to EUTRAN access parameter of eating dishes without rice or wine;

719.SRUE sends handoff completion message to EUTRAN network;

720.EUTRAN receives handoff completion message, notifies MME by handoff notification message;

721.MME returns handoff completion message to eMSC, and eMSC notifies SourceMSC;

Whether 722.SourceMSC receives the handoff completion message of objective network, GERAN/UTRAN Internet resources and interface-free resources;

By S-GW, 723-726.MME notifies that the default bearer created before is updated to new S-GW by P-GW;

Both 727.eMSC with SRUE sets up, media are connected;

Media between the two connect and comprise two parts.Part I is IP Deta bearer by connecting between eMSC and P-GW, and SGi mouth standard agreement is deferred in this connection; Another part is that P-GW and SRUE is shown in that media connect, and this connection is EPS carrying, defers to EPS network related protocol.Between eMSC and P-GW, IP Deta bearer does not need independent foundation, only needs object IP and source IP just can mutually transmit in transmitting procedure, and both eMSC and SRUE sets up, directly media connect the crucial EPS bearer connection needing to set up between SRUE and P-GW.Such as, the default bearer reserved when can be adopted and be switched set-up procedure by UE or eMSC creates these media and connects.

After media connection establishment both eMSC and SRUE sets up, eMSC is converted to ip voice packet the circuit domain VoP receiving SourceMSC, SRUE is sent to by media connection between the two according to TFT, receive the ip voice packet from SRUE simultaneously, be converted to circuit domain voice packet and be transmitted to SourceMSC;

728.SRUE receives according to voice TFT and sends ip voice packet;

If 729. SRUE not yet register at IMS, SRUE carries out IMS registration to this user ascription area IMS;

After 730. registrations, SRUE sends session invitation message to IMS network element, notice IMS carries out far-end renewal, carries SRUE media IP address and newly assigned port numbers and Session Hand-off and identify (SessionTransferIdentification) in message.After IMS receives session invitation message, upgrade distant end media and connect;

After 731. far-ends are updated successfully, return message, in message, carry IP address and the port numbers of distant end media, far-end speech packet, changed into issued SRUE by originally issuing SourceMSC, after UE has received message simultaneously, termination is sent to eMSC, changes into and is sent to distant end media IP and port;

Between 732. release SRUE and eMSC, media connect, the IP address of release eMSC side and port.

Pass through the present embodiment, eMSC is before notice UE is switched in objective network, and first notification target network is that UE prepares Internet resources, sets up the default bearer of UE, and be UE distributing IP address in the process setting up default bearer, thus further reduce the time of voice interruption in handoff procedure.

Embodiment three

The present embodiment is described the flow process whether SGSG notice MSC current UE is just initiating PS data service.

Fig. 8 is the signaling process of the present embodiment, mainly comprises the steps:

801.SRUE registers in PS territory, and is registered on MSC by combined registering by SGSN;

802.SRUE initiates data service request;

803.SGSN, by notification message, informs that the current SRUE of MSC initiates data service;

804.SRUE and far-end IP network carry out data interaction;

805.SRUE initiates release data service request;

806.SGSN cancels data service by the current SRUE of notification message notice MSC;

The PS of 807.PS network release UE connects.

By the present embodiment, can notify whether MSC:SRUE is just initiating PS data service by the SGSN of combined registering, thus MSC can be judged, and whether SRUE exist CS speech business and PS data service simultaneously.

From above description, can find out, in embodiments of the present invention, UTRAN/GERAN in the CS territory preparing to initiate single channel UE to the switching in PS territory time, notice is sent to eMSC, eMSC is after receiving notice, judge whether this UE exists CS speech business and PS data service simultaneously, if, the then MME of notification target network, the MME of objective network is after receiving the notice of eMSC, after CS to PS (CStoPS) the handover request message receiving this UE and PS to PS (PStoPS) handover request, just the network element of notification target network is that UE prepares Internet resources, then notify that UE is switched to objective network, thus make the CS speech business of UE and PS data service can synchronism switching, and, due to objective network before UE is switched to objective network for UE has prepared Internet resources, thus speech interruption time in handoff procedure can be reduced, further raising Consumer's Experience.

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

The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (12)

1. a single radio voice call continuity realization method, is switched to the process of packet switched ps domain network, it is characterized in that from circuit-switched CS domain network for user equipment (UE), described method comprises:

Global system for mobile communications wireless access network UTRAN or GSMEDGE wireless access network GERAN notifies that strengthening mobile switching centre eMSC prepares UE to be switched to PS territory network by CS territory network;

Described eMSC determines that described UE exists CS speech business and PS data service simultaneously, and described in the Mobility Management Entity MME notifying described PS territory network, UE exists CS speech business and PS data service simultaneously;

Described MME, after PS to the PS handover request message of CS to the PS handover request message and described UE that receive described UE, notifies that the network element of described PS territory network is that described UE prepares Internet resources;

Described MME is switched to described PS territory network by UE described in the network advertisement of described CS territory;

After described UE is switched to described PS territory network, the media data described in the described network resource transmission prepared for described UE by described PS territory network between UE and far-end;

Wherein, described UTRAN or GERAN notifies that eMSC prepares that UE is switched to PS territory network by CS territory network and comprises: described UTRAN or GERAN judges whether described UE exists CS speech business and PS data service simultaneously, notice is sent to described eMSC, notice prepares UE to be switched to PS territory network by CS territory network, wherein, the business the indication information whether described UE of instruction exists CS speech business and PS data service is simultaneously carried in described notice;

Described eMSC determines that described UE exists CS speech business simultaneously and PS data service comprises: described eMSC parses described business indication information from described notice, according to the instruction of described business indication information, determine that described UE exists CS speech business and PS data service simultaneously.

2. method according to claim 1, is characterized in that, also comprises: the Serving GPRS Support Node SGSN of described CS territory network sends a notification message to described eMSC, and described notification message is used for notifying whether UE described in described eMSC is just initiating PS data service;

Described eMSC determines that described UE exists CS speech business simultaneously and PS data service comprises: described eMSC resolves described notification message knows that described UE is just initiating PS data service, determines that described UE exists CS speech business and PS data service simultaneously.

3. method according to claim 2, is characterized in that, described SGSN sends a notification message to described eMSC and comprises: when described UE is when described SGSN initiates or terminate PS data service, described SGSN sends described notification message to described eMSC.

4. according to the method in any one of claims 1 to 3, it is characterized in that, described eMSC notifies that UE described in described MME exists CS speech business simultaneously and PS data service comprises: described eMSC sends described CS to PS handover request message to described MME, carries the PS business instruction that the described UE of instruction exists CS speech business and PS data service simultaneously in described CS to PS handover request message.

5. method according to claim 1, is characterized in that, described MME is switched to described PS territory network by UE described in the network advertisement of described CS territory and comprises:

Described MME sends CS to PS handover acknowledge message to described eMSC;

Described eMSC sends to switch to described UTRAN or GERAN and prepares response message;

Described UTRAN or GERAN, after receiving described switching and preparing the handover acknowledge message of response message and described PS to PS handover request message, sends switching command to described UE, notifies that described UE is switched to described PS territory network.

6. method according to claim 5, is characterized in that, carries the contextual information of described UE, comprise the information of the default bearer of described UE in described contextual information in described PS to PS handover request message; Described MME notifies that the network element of described PS territory network is that described UE preparation Internet resources comprise:

Step 1, described MME obtains the user profile of described UE, selects the service gateway entity S-GW of described PS territory network according to described user profile;

Step 2, described MME sends to described S-GW and creates conversation request message, and request creates the default bearer of described UE;

Step 3, described S-GW is that described default bearer distributes bearing resource, returns and creates session request-reply message, carry the IP address of described UE in this establishment session request-reply message to described MME;

Step 4, described MME sends handover request message to the UTRAN of evolution, notifies that the UTRAN of described evolution distributes the interface-free resources of described default bearer;

Step 5, the handover acknowledge message that the UTRAN that described MME receives described evolution returns, wherein, carries the access parameter of described interface-free resources in described handover acknowledge message.

7. method according to claim 6, is characterized in that, the user profile that described MME obtains described UE comprises one of following:

Described MME obtains the user profile of the local described UE preserved;

Described MME parses the user profile of described UE from described PS to PS handover request message;

Described MME obtains the user profile of described UE to the home network server of described UE according to the mark of described UE.

8. method according to claim 6, is characterized in that, described CS to PS handover acknowledge message, described switching prepare the access parameter carrying described interface-free resources in response message and described switching command; After sending switching command to described UE, described method also comprises: described UE is linked into described PS territory network according to the access parameter of described interface-free resources.

9. method according to claim 6, is characterized in that, carries the described IP address that promising described UE distributes in described handover acknowledge message and described CS to PS handover acknowledge message.

10. method according to claim 9, is characterized in that, described eMSC also comprises before sending switching preparation response message to described UTRAN/GERAN:

Described eMSC distributes the IP address connected for described media and the port numbers of described eMSC;

Described UE or described eMSC is according to the IP address of opposite end, and the media adopting described default bearer to set up between described UE with described eMSC are connected;

Comprised by the media data described in the network resource transmission for described UE distribution between UE with far-end: be connected the media data between the described UE of transmission and far-end by described media.

11. methods according to claim 10, is characterized in that, described eMSC is connected with described UTRAN or GERAN by source MSC; When setting up the media between described UE with described eMSC and being connected, also comprise: described eMSC sets up and is connected with the media of described far-end, or described eMSC sets up and between described source MSC, circuit domain carries.

12. 1 kinds of single radio voice call continuities realize system, it is characterized in that, comprising:

UTRAN or GERAN, for notifying that eMSC prepares UE to be switched to PS territory network by CS territory network;

Described eMSC, for judging whether described UE exists CS speech business and PS data service simultaneously, if so, then described in the MME notifying described PS territory network there is CS speech business and PS data service in UE simultaneously;

Described MME, for receiving after described eMSC indicates described UE to there is the notice of CS speech business and PS data service simultaneously, after PS to the PS handover request message of CS to the PS handover request message and described UE that receive described UE, notify that the network element of described PS territory network is that described UE prepares Internet resources, after being switched to described PS territory network to make UE, media data described in the described network resource transmission prepared for described UE by described PS territory network between UE and far-end, and, described MME is also for being switched to described PS territory network by UE described in the network advertisement of described CS territory,

Wherein, described UTRAN or GERAN notifies that eMSC prepares that UE is switched to PS territory network by CS territory network and comprises: described UTRAN or GERAN judges whether described UE exists CS speech business and PS data service simultaneously, notice is sent to described eMSC, notice prepares UE to be switched to PS territory network by CS territory network, wherein, the business the indication information whether described UE of instruction exists CS speech business and PS data service is simultaneously carried in described notice;

Described eMSC determines that described UE exists CS speech business simultaneously and PS data service comprises: described eMSC parses described business indication information from described notice, according to the instruction of described business indication information, determine that described UE exists CS speech business and PS data service simultaneously.