CN102238679A - Single radio voice call continuity realization method and system - Google Patents
Single radio voice call continuity realization method and system Download PDFInfo
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Abstract
The invention discloses a single radio voice call continuity realization method and a single radio voice call continuity realization system. The method comprises that: a universal mobile telecommunication system radio access network (UTRAN) or a global system for mobile communication (GSM) enhanced data rate for GSM evolution (EDGE) radio access network (GERAN) informs an enhanced mobile switch center (eMSC) of preparing for the switching of user equipment (UE) from a circuit switch (CS) domain network to a packet switch (PS) domain network; the eMSC determines the UE simultaneously has a CS voice service and a PS data service, and informs a mobility management entity (MME) of the PS domain network about that the UE simultaneously has the CS voice service and the PS data service; after receiving a CS-to-PS switching request message and a PS-to-CS switching request message from the UE, the MME informs a network element of the PS domain network of preparing network resources for the UE; the MME informs the UE of the switching to the PS domain network by the CS domain network; and after being switched to the PS domain network, the UE transmits media data between the UE and a far end by using the network resources prepared for the UE by the PS domain network. By the method and the system, the CS voice service and PS data service of the UE can be synchronously switched.
Description
Technical field
The present invention relates to the communications field, in particular to a kind of single channel voice continuity implementation method and system.
Background technology
Fig. 1 is grouping domain system (the Evolved Packet System of evolution, abbreviate EPS as) Organization Chart, comprise: the global system for mobile communications wireless access network of evolution (EvolvedUniversal Mobile Telecommunication System Radio Access Network, be called for short E-UTRAN or EUTRAN), mobile management entity (Mobility ManagementEntity, abbreviate MME as), service gateway entity (Serving Gateway abbreviates S-GW as); Packet data network gateway (Packet Data Network Gateway, abbreviate PDN GW or P-GW as), Serving GPRS Support Node (Serving GPRS SupportingNode, abbreviate SGSN as), charging and policy control entity (Policy and ChargingRule Function, abbreviate PCRF as) and home network server (Home SubscriberServer, HSS).Wherein, P-GW and S-GW may close and be located in the physical entity.
Fig. 2 is single channel voice continuity in the correlation technique (Single Radio Voice CallContinuity abbreviates SRVCC an as) system architecture diagram.Wherein, UTRAN/GSM EDGE wireless access network (GSM EDGE radio access network abbreviates GERAN as) is mainly used in and is 3G/2G circuit switching (Circuit Switch abbreviates CS as) territory network insertion; E-UTRAN is mainly used in packet switching (Packet Switch abbreviates PS as) territory network insertion; Source mobile switching centre (Source Mobile Switch Center abbreviates SourceMSC as) is mainly used in the user in source circuit switching network user's face and signaling function of exchange; Strengthen (the enhanced Mobile Switch Center of mobile switching centre, abbreviate eMSC as), be used to help single channel (Single Radio abbreviates SR as) UE to finish voice continuity between CS territory and PS territory, this network element can be deployed as same network element with Source MSC.
IP Multimedia System (IP Multimedia Core Network Subsystem, abbreviating IMS as) network element is the related network elements in the IMS business system, in the IMS business system, key-course separates with operation layer, key-course does not provide concrete business, only provide functions such as necessary triggering, route, charging, professional trigger and controlled function is that CSCF (Call Session Control Function abbreviates CSCF as) is finished in the key-course to operation layer.CSCF is divided into: Proxy Call Session Control Function (Proxy-CSCF, abbreviate P-CSCF as), query call conversation control function (Interrogating-CSCF, abbreviate I-CSCF as) and three types of service call conversation control functions (Serving-CSCF abbreviates S-CSCF as).And operation layer is to be made up of a series of application servers (Application Server abbreviates AS as), and concrete business service can be provided, and AS can be an independent entity, also may reside among the S-CSCF.
Fig. 3 is that the single channel voice business continuity switches to the PS territory flow chart of (can be called reverse switching) in the correlation technique from the CS territory, describe SR UE and set up session at circuit commutative field network and far-end earlier, signaling and business are anchored on the IMS network, the follow-up generation single channel of SR UE voice continuity, SR UE is from Long Term Evolution (Long-Term Evolution abbreviates LTE as) network insertion, rebulids with distant end media to be connected, keep the continuous process of session, comprise the steps:
301, the wireless measurement report that reports of the network based SR UE of GERAN/UTRAN, decision is initiated to switch to E-UTRAN;
302, GERAN/UTRAN sends handoff request message (HORequired) to Source MSC, carries the Target Cell Identifier of definite object E-UTRAN network in the message;
303, Source MSC sends to switch to eMSC according to Target Cell Identifier in the message and prepares message (Prepare HO Request), and the notification target network switches;
304, eMSC judges that there are not Internet resources in SR UE in target E-UTRAN network, judges whether to possess Internet resources, and eMSC can perhaps inquire about at device interior to objective network MME inquiry.
305, eMSC returns to switch to Source MSC and prepares response message (Prepare HOResponse), carry network insertion indication (Networl Access Indicator in the message, NAI), notify SR UE in E-UTRAN network insertion New-deployed Network resource, to finish switching by this indication;
306, Source MSC returns handover acknowledge message (HO Response) to source GERAN/UTRAN network, carries the network insertion indication in the message;
307, source GERAN/UTRAN transmission switching command (HO Command) notice SR UE switches.Carry the network insertion indication in the message, indication UE is linked into the E-UTRAN network, and the New-deployed Network resource is finished switching;
308, SR UE receives switching command, according to the network insertion indication, switches to the E-UTRAN network, and initiates standard-track area update flow process (Tracking AreaUpdate abbreviates TAU as);
Because SR UE switches to the E-UTRAN network, therefore, from this moment, user's face is connected and ruptures between SR UE and the GERAN/UTRAN, and the voice between SR UE and far-end temporarily can't communication.
309, SR UE sets up required carrying at the E-UTRAN network, and the process of foundation is a standard P S loading establishing process, is not described in detail here;
310, after carrying was set up and finished, SR UE registered to user ascription area IMS network;
311, succeed in registration, SR UE sends session invitation message (INVITE) to user ascription area IMS network, message is carried static configuration and is shifted indication (Session Transfer Indication in the session of UE inside, abbreviate STI as), this session of indication IMS network element is used for business continuance (Service Continuity abbreviates SC as).The IMS network element is by upgrading the far-end flow process, original IP medium connected be connected to Source MSC by far-end to be updated to SR UE and directly to link to each other, middle may some EPS network elements of approach and other network equipments.This step is the SC flow process of standard, does not describe in detail here;
312, after far-end upgraded successfully, the IMS network element returned success message (200OK) to SR UE.After SR UE received 200Ok message, the speech communication between recovery and the far-end was finished SR UE and switch voice continuity between CS and PS.
The inventor finds, in above-mentioned single channel voice business continuity implementation method, if the current PS territory business in addition of SR UE, then GERAN/UTRAN also needs to notify SGSN to switch, SGSN receives notice, to send PS to PS handoff request to MME, MME is after receiving this handoff request, carry out the switching of PS to PS, because the CS of SR UE is separate to the switching of PS to switching and the PS of PS, thereby the CS territory that will cause SR UE switching professional and PS territory business is asynchronous, has reduced user's experience.
Summary of the invention
Main purpose of the present invention is to provide a kind of single channel voice continuity implementation method and system, one of to address the above problem at least.
According to an aspect of the present invention, provide a kind of single channel voice continuity implementation method, having comprised: UTRAN or GERAN notice eMSC prepare UE is 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 MME UE of notice PS territory network exists CS speech business and PS data service simultaneously; MME the CS that receives this UE to PS handoff request message and PS after PS handoff request message, the network element of notice PS territory network is these UE preparation Internet resources; MME switches to PS territory network by CS territory network notice UE; After UE switches to PS territory network, be the Internet resources transmission UE of UE preparation and the media data between the far-end by PS territory network.
According to a further aspect in the invention, provide a kind of single channel voice continuity to realize system, having comprised: UTRAN or GERAN are used to notify eMSC to prepare UE is switched to PS territory network by CS territory network; EMSC is used to judge whether this UE exists CS speech business and PS data service simultaneously, if then notify this UE of MME of PS territory network to have CS speech business and PS data service simultaneously; MME, be used for receiving after there is the notice of CS speech business and PS data service simultaneously in eMSC indication UE, the CS that receives this UE to the PS of PS handoff request message and this UE after PS handoff request message, the network element of notice PS territory network is prepared Internet resources for this UE, so that after UE switches to PS territory network, be the Internet resources transmission UE of this UE preparation and the media data between the far-end by PS territory network, and MME is used for also switching to PS territory network by CS territory network notice UE.
By the present invention, when UTRAN/GERAN arrives the switching in PS territory in the CS territory of preparing initiation single channel UE, send notice to eMSC, eMSC is after receiving notice, judge whether this UE exists CS speech business and PS data service simultaneously, if, the MME of notification target network then, the MME of objective network is after receiving the notice of eMSC, the CS that receives this UE to PS (CS to PS) handoff request message and PS after PS (PS to PS) handoff request, just the network element of notification target network is that UE prepares Internet resources, notifies UE to switch to objective network then, thereby makes the CS speech business of UE and PS data service to switch synchronously, and, since objective network before UE switches to objective network for UE has prepared Internet resources, thereby can reduce the voice interruption time in the handoff procedure, further improve user experience.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is an EPS system architecture schematic diagram in the correlation technique;
Fig. 2 is the single radio voice call continuity Organization Chart in the correlation technique;
Fig. 3 is the flow chart that the single mode voice business continuity switches packet-switched domain in the correlation technique from circuit commutative field;
Fig. 4 is a structural representation of realizing system according to the single channel voice continuity of the embodiment of the invention one;
Fig. 5 is the configuration diagram that the another kind of single channel voice continuity of the embodiment of the invention one is realized system;
Fig. 6 is the flow chart according to the single channel voice continuity implementation method of the embodiment of the invention one;
Fig. 7 is the signaling process figure according to the embodiment of the invention two;
Fig. 8 is the signaling process figure according to the embodiment of the invention three.
Embodiment
Hereinafter will describe the present invention with reference to the accompanying drawings and in conjunction with the embodiments in detail.Need to prove that under the situation of not conflicting, embodiment and the feature among the embodiment among the application can make up mutually.
Embodiment one
Fig. 4 is a structural representation of realizing system according to the single channel voice continuity of the embodiment of the invention one, comprising: the MME 30 of UTRAN/GERAN 10, eMSC 20 and objective network (being PS territory network).Wherein, UTRAN/GERAN 10, are used to notify eMSC20 to prepare UE is switched to PS territory network (being objective network) by CS territory network; EMSC20 is used to judge whether UE exists CS speech business and PS data service simultaneously, if then notify MME 30 these UE to have CS speech business and PS data service simultaneously; MME 30 is used for receiving after there are the notice of CS speech business and PS data service simultaneously in eMSC 20 indication UE, the CS that receives this UE to the PS of PS handoff request message and this UE after PS handoff request message, the network element of notice PS territory network is prepared Internet resources for this UE, so that after UE switches to PS territory network, by PS territory network is the Internet resources transmission UE of its preparation and the media data between the far-end, and MME30 also is used for switching to PS territory network by CS territory network (being source network) notice UE.
Since in the correlation technique when carrying out the switching of SR UE from the CS territory to the PS territory, if the current PS territory business in addition of SR UE, the switching of the CS of SR UE to the switching of PS and PS to PS is separate, thereby will cause the CS territory switching professional and PS territory business of SR UE asynchronous.And in the said system that present embodiment provides, when UTRAN/GERAN10 arrives the switching in PS territory in the CS territory of preparing initiation single channel UE, send notice to eMSC 20, eMSC 20 is after receiving notice, judge whether this UE exists CS speech business and PS data service simultaneously, if, the MME 30 of notification target network then, the MME 30 of objective network is after receiving the notice of eMSC, after CSto PS handoff request message that receives this UE and PS to PS handoff request, just the network element of notification target network is that UE prepares Internet resources, notify UE to switch to objective network then, thereby make the CS speech business of UE and PS data service to switch synchronously, and, since objective network before UE switches to objective network for UE has prepared Internet resources, thereby can reduce the voice interruption time in the handoff procedure.
Source MSC does not have the enhancing ability in the preferred embodiment of the present invention, communicate by source MSC between UTRAN/GERAN 10 and the eMSC 20, therefore, said system also comprises source MSC, Fig. 5 is that the another kind of single channel voice continuity of present embodiment is realized the system architecture schematic diagram, this system also comprises: source MSC 40, insert objective network by E-UTRAN, and also comprise network elements such as S-GW/P-GW and PCRF in the objective network (being PS territory network).
UTRAN/GERAN 10 is when notice eMSC 20 preparations switch to PS territory network with UE in the present embodiment, UTRAN/GERAN 10 can also judge whether this UE exists CS speech business and PS data service simultaneously, and when notice eMSC 20 preparations switch to PS territory network with UE, judged result is notified to eMSC 20, and eMSC 20 can judge according to this judged result whether UE exists CS speech business and PS data service simultaneously.Perhaps, eMSC 20 also can judge whether UE exists CS speech business and PS data service simultaneously according to the notice of SGSN, for example, when UE initiates or the end data business time at SGSN, whether eMSC 20 current UE of combined registering were initiating data service when SGSN can notify UE to register to SGSN, and eMSC 20 can determine according to the notice of SGSN whether UE exists CS speech business and PS data service simultaneously.
Fig. 6 is according to the flow chart of the single channel voice continuity implementation method of the embodiment of the invention one, mainly may further comprise the steps (step S602-step S610):
Step S602, UTRAN/GERAN notice eMSC prepares UE is switched to PS territory network by CS territory network;
For example, source MSC is the MSC (being eMSC) of enhancement mode, and then UTRAN/GERAN determines to initiate to insert between network and switches according to the wireless measurement report that UE reports, and sends this UE of handoff request message informing eMSC preparation the switching to PS territory network to eMSC; Source MSC is the MSC of non-enhancement mode, then UTRAN/GERAN reports according to the wireless measurement that UE reports, decision is initiated to insert between network and is switched, send handoff request message to source MSC, the target cell information that source MSC carries according to handoff request sends switching to eMSC and prepares this UE of message informing eMSC preparation switching to PS territory network.
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;
For example, 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 notice eMSC prepares to switch UE to PS territory network, judged result is notified to eMSC, for example, UTRAN/GERAN can be carried at the professional sign that is used for indicating UE whether to have CS speech business and PS data service simultaneously above-mentioned handoff request message and send to eMSC, eMSC can determine according to the indication of this business sign whether UE exists CS speech business and PS data service simultaneously;
Perhaps, UE is when SGSN initiates or finish the PS data service, and SGSN can send notice to the eMSC of this UE combined registering when registering to SGSN, and eMSC can determine according to this notice whether UE exists CS speech business and PS data service simultaneously.
For example, eMSC can notify this UE of MME whether to have CS speech business and PS data service simultaneously by carry professional sign in the CS to PS handoff request message that sends to MME, for example, can take a bit indicates, if the value of this bit is 1, then indicate UE to have CS speech business and PS data service simultaneously; Perhaps, eMSC also can send the notification message of a special use to MME, indicates this UE of MME whether to have CS speech business and PS data service simultaneously by this notification message.
Step S606, MME the CS that receives UE to the PS of PS handoff request message and UE after PS handoff request message, 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 the CS that receives this UE to the PS of PS handoff request message and UE after PS handoff request message, the network element of just notifying PS territory network is UE preparation Internet resources.If there is not the PS data service in eMSC notice UE, then promptly to notify the network element of PS territory network after receiving CS to PS handoff request be that UE prepares Internet resources to MME.For example, can to notify the network element of PS territory network according to following steps be that UE prepares Internet resources to MME:
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 that preserves; (2) MME parses the user profile of this UE from PS to PS handoff request message, promptly parses the user profile of this UE from the contextual information of UE; (3) MME obtains the user profile of this UE to the home network server of UE according to the sign of UE.
Step 2, MME sends to S-GW and creates conversation request message, and the default bearer of UE is created in request;
Wherein, the PS that MME receives carries the contextual information of described UE in the PS handoff request message, includes the sign of the default bearer of this UE in this contextual information;
Step 3, described S-GW is that described default bearer distributes bearing resource, returns to described MME and creates the conversation request response message, carries the IP address of described UE in this establishment conversation request response message;
Step S608, MME switches to PS territory network by CS territory network notice UE;
For example, MME can send CS to PS handover acknowledge message message to eMSC, can carry the access parameter of the interface-free resources of objective network distribution in this message, eMSC is after receiving this message, can return switching preparation response message to source MSC or direct UTRAN/GERAN, this switching prepares to carry in the response message access parameter of above-mentioned interface-free resources, finally send switching command message to UE by UTRAN/GERAN, carry the access parameter of above-mentioned interface-free resources in this switching command message, notice UE switches to objective network, after UE receives switching command message, be linked into objective network according to the access parameter of above-mentioned interface-free resources.
After step S610, UE switch to PS territory network, be the above-mentioned Internet resources transmission UE of UE preparation and the media data between the far-end by PS territory network.
For example, can between UE and eMSC, set up one section interim medium and be connected, after UE switches to PS territory network, before the IMS distant end media is upgraded successfully, can connect media data between transmission UE and the far-end by these medium.For example, can initiatively initiate to set up these medium by UE and connect, also can initiatively initiate by eMSC.Can reduce the time of the dropped calls between UE and the far-end like this.
Perhaps, also can be not setting up interim medium between UE and eMSC is connected, but according to flow performing shown in Figure 3, step after the execution in step 307, be with the difference of flow process shown in Figure 3, in the present embodiment, because objective network is set up default bearer for UE, therefore, do not need again execution in step 309.Thereby can reduce the time of the communicating interrupt of UE and far-end.
Above-mentioned single channel voice continuity implementation method by present embodiment, when eMSC prepares to switch UE to PS territory network at the MME of notification target network, whether this UE of notice MME exists PS data service and CS speech business simultaneously, if, then MME is after CS to PS handoff request message that receives this UE and PS to CS handoff request message, just the network element of request target network is the UE allocation of network resources, and after Resource Allocation in Networks success, reinform UE and switch to the PS territory, thereby can guarantee the CS speech business of UE and the synchronous switching of PS data service.
Embodiment two
Present embodiment described for SR UE when circuit domain speech business and PS domain data service take place in GERAN/UTRAN network simultaneously, switch to the flow process of PS territory network.Fig. 7 is the signaling process figure of present embodiment, the measurement report that GERAN/UTRAN reports according to SR UE, and the access network switching is initiated in decision, sends handoff request message to source MSC, mainly may further comprise the steps:
701.GERAN/UTRAN according to the wireless measurement report that SR UE reports, decision is initiated to insert between network and is switched;
702.GERAN/UTRAN perception SU UE initiates CS speech business and PS data service simultaneously at this network, send handoff request message to source MSC, the destination address location cell is a target P S territory network cell in this message, and, also carry the professional sign of PS in this message, the professional sign of this PS is used to indicate this UE to initiate CS speech business and PS data service simultaneously at source network;
703.GERAN/UTRAN send handoff request message to SGSN simultaneously;
After 704. source MSC receives handoff request message, select eMSC according to target cell information, send switching to eMSC and prepare message, carry cell-of-origin and target cell information, the professional sign of PS and User Identity (for example IMSI) in the message, if source MSC judges the current resident SGSN address of UE is arranged in this equipment, then the SGSN address also is carried in this message;
705.eMSC receive to switch and prepare message, according to Target cell, select MME, send CS to PS handoff request message to this MME, (for example carry cell-of-origin and target cell information, the professional sign of PS and User Identity in this message, IMSI), if the switching that receives prepares to carry the SGSN address in the message, then also this SGSN address is carried in the CS to PS handoff request message.
Wherein, if if source MSC and eMSC are same entity, then do not need to transmit the message between above-mentioned source MSC and the eMSC;
706.SGSN send PS to PS handoff request message to MME, carry the contextual information of UE in this message, include the sign of the default bearer of UE in this contextual information;
707-708.MME judge and whether carry the professional sign of PS in the CS to PS handoff request message that receives, if, then MME is after receiving the PS toPS handoff request message of step 706, select S-GW/P-GW, the indicated default bearer of sign in the contextual information in the request S-GW/P-GW foundation step 706;
After 709.MME default establishment finishes, according to target cell information select target EUTRAN, send handoff request message to target EUTRAN, notice EUTRAN distributes interface-free resources, and message is carried the link address of the default bearer S-GW user face connection EUTRAN of 707-708 establishment.After EUTRAN distributes interface-free resources to finish, set up that medium are connected between EUTRAN and S-GW, return handover acknowledge message, carry the interface-free resources access parameter that is distributed in the message to MME;
710.MME return CS to PS handover acknowledge message, the IP address of carrying EUTRAN interface-free resources access parameter and UE in the message to eMSC;
711. simultaneously, MME returns PS to PS handover acknowledge message to SGSN, carries the access parameter of the interface-free resources of E-UTRAN distribution in this message;
712.SGSN return handover acknowledge message to GERAN/UTRAN;
713.eMSC after receiving CS to PS handover acknowledge message, divide and to be used in user's face IP address and the port numbers that medium are connected between eMSC and SR UE, and according to receiving that UE IP address generates speech business flow template (Traffic Flow Template, abbreviate TFT as), this template is used to indicate UE and eMSC to set up that medium are connected between SR UE and eMSC, and by these voice TFT reception/transmission voice medium;
Wherein, voice TFT comprises UE side and eMSC side IP address and port numbers, and the UE side ports is provided with the default value of network regulation;
714.eMSC return and switch to prepare response message and give Source MSC, carry the TFT that 713 steps generate in the message, the user sets up the Handover Number of CS carrying, and the EUTRAN access parameter of eating dishes without rice or wine;
Prepare response message 715. source MSC receives to switch, set up CS carrying between SourceMSC and eMSC according to Handover Number;
716. source MSC returns handover acknowledge message to GERAN/UTRAN, carries EUTRAN eat dishes without rice or wine access parameter and TFT in the message;
717.GERAN/UTRAN receive the handover acknowledge message from SGSN and source MSC simultaneously, by switching command message, notice SR UE switches, and carries EUTRAN eat dishes without rice or wine access parameter and TFT in the message;
718.SR UE switches to the EUTRAN network according to the EUTRAN access parameter of eating dishes without rice or wine;
719.SR UE sends handoff completion message to the EUTRAN network;
720.EUTRAN receive handoff completion message, by handoff notification message notice MME;
721.MME return handoff completion message to eMSC, eMSC notifies SourceMSC;
722.Source whether MSC receives the handoff completion message of objective network, GERAN/UTRAN Internet resources and interface-free resources;
723-726.MME the default bearer that will create before by S-GW notice P-GW is updated to new S-GW;
727.eMSC setting up both medium with SR UE is connected;
Medium between the two connect and comprise two parts.First is by being connected to the IP Data-carrying between eMSC and the P-GW, SGi mouth standard agreement is deferred in this connection; Another part is that P-GW sees that with SR UE medium are connected, and this is connected to the EPS carrying, defers to EPS network related protocol.The IP Data-carrying does not need independent foundation between eMSC and the P-GW, only needs purpose IP and source IP just can transmit mutually in the transmission course, and eMSC and SR UE set up both direct medium and connect the crucial EPS carrying connection that need set up between SR UE and the P-GW.For example, the default bearer of reserving in the time of can adopting the switching set-up procedure by UE or eMSC is created this medium and is connected.
EMSC and SR UE set up both medium be connected set up finish after, eMSC is receiving that the circuit domain VoP of Source MSC is converted to the ip voice packet, connect according to the medium of TFT by between the two and to send to SR UE, receive ip voice packet simultaneously, be converted to the circuit domain voice packet and be transmitted to Source MSC from SR UE;
728.SR UE receives and sends the ip voice packet according to voice TFT;
If 729. SR UE does not register at IMS as yet, SR UE carries out the IMS registration to this user ascription area IMS;
730. after registration finished, SR UE sent session invitation message to the IMS network element, notice IMS carries out far-end to be upgraded, and carries SR UE medium IP address and newly assigned port numbers and session in the message and shifts sign (Session Transfer Identification).After IMS receives session invitation message, upgrade distant end media and connect;
731. after far-end upgrades successfully, return and finish message, carry the IP address and the port numbers of distant end media in the message, the far-end speech packet changed into and issued SR UE by issuing Source MSC originally, after UE receives and finishes message simultaneously, termination is sent to eMSC, changes into being sent to distant end media IP and port;
Medium connect between SR UE and the eMSC 732. discharge, and discharge the IP address and the port of eMSC side.
Pass through present embodiment, eMSC is before notice UE switches in the objective network, and first notification target network is that UE prepares Internet resources, sets up the default bearer of UE, and in setting up the process of default bearer, be UE distributing IP address, thereby further reduced the time of voice interruption in the handoff procedure.
Embodiment three
The flow process whether present embodiment is just initiating the PS data service to SGSG notice MSC current UE describes.
Fig. 8 is the signaling process of present embodiment, mainly comprises the steps:
801.SR UE registers in the PS territory, and is registered on the MSC by SGSN by combined registering;
802.SR UE initiates the data service request;
803.SGSN, inform that the current SR UE of MSC initiates data service by notification message;
804.SR UE and far-end IP network carry out data interaction;
805.SR UE initiates to discharge the data service request;
806.SGSN cancelled data service by the current SR UE of notification message notice MSC;
807.PS discharging the PS of UE, network connects.
By present embodiment, can whether just initiate the PS data service by the SGSN notice MSC:SR UE of combined registering, thereby make MSC can judge whether SR UE exists CS speech business and PS data service simultaneously.
From above description, as can be seen, in embodiments of the present invention, when UTRAN/GERAN arrives the switching in PS territory in the CS territory of preparing initiation single channel UE, send notice to eMSC, eMSC is after receiving notice, judge whether this UE exists CS speech business and PS data service simultaneously, if, the MME of notification target network then, the MME of objective network is after receiving the notice of eMSC, the CS that receives this UE to PS (CS to PS) handoff request message and PS after PS (PS to PS) handoff request, just the network element of notification target network is that UE prepares Internet resources, notifies UE to switch to objective network then, thereby makes the CS speech business of UE and PS data service to switch synchronously, and, since objective network before UE switches to objective network for UE has prepared Internet resources, thereby can reduce the voice interruption time in the handoff procedure, further improve user experience.
Obviously, those skilled in the art should be understood that, above-mentioned each module of the present invention or each step can realize with the general calculation device, they can concentrate on the single calculation element, perhaps be distributed on the network that a plurality of calculation element forms, alternatively, they can be realized with the executable program code of calculation element, thereby, they can be stored in the storage device and carry out by calculation element, and in some cases, can carry out step shown or that describe with the order that is different from herein, perhaps they are made into each integrated circuit modules respectively, perhaps a plurality of modules in them or step are made into the single integrated circuit module and realize.Like this, the present invention is not restricted to any specific hardware and software combination.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (13)
1. single channel voice continuity implementation method is used for user equipment (UE) and switches to the process of packet switching PS territory network from circuit switching (CS) territory network, it is characterized in that described method comprises:
Global system for mobile communications wireless access network UTRAN or GSM EDGE wireless access network GERAN notice strengthen the eMSC of mobile switching centre and prepare UE is switched to PS territory network by CS territory network;
Described eMSC determines that described UE exists CS speech business and PS data service simultaneously, notifies the described UE of Mobility Management Entity MME of described PS territory network to have CS speech business and PS data service simultaneously;
Described MME the CS that receives described UE to the PS of PS handoff request message and described UE after PS handoff request message, the network element of notifying described PS territory network is that described UE prepares Internet resources;
Described MME notifies described UE to switch to described PS territory network by described CS territory network;
After described UE switches to described PS territory network, be that described Internet resources that described UE prepares transmit the media data between described UE and the far-end by described PS territory network.
2. method according to claim 1 is characterized in that,
Described UTRAN or GERAN notice eMSC prepare that UE is switched to PS territory network by CS territory network and comprise: described UTRAN or GERAN judge whether described UE exists CS speech business and PS data service simultaneously, send notice to described eMSC, notice is prepared UE is switched to PS territory network by CS territory network, wherein, carry the professional the indication information whether described UE of indication exists CS speech business and PS data service simultaneously in the described notice;
Described eMSC determines that described UE exists CS speech business and PS data service to comprise simultaneously: described eMSC parses described professional indication information from described notice, according to the indication of described professional indication information, determine that described UE exists CS speech business and PS data service simultaneously.
3. 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 to notify the described UE of described eMSC whether just initiating the PS data service;
Described eMSC determines that described UE exists CS speech business and PS data service to comprise simultaneously: described eMSC resolves described notification message knows that described UE is just initiating the PS data service, determines that described UE exists CS speech business and PS data service simultaneously.
4. method according to claim 3 is characterized in that, described SGSN sends a notification message to described eMSC and comprises: when described UE when described SGSN initiates or finish the PS data service, described SGSN sends described notification message to described eMSC.
5. according to each described method in the claim 1 to 4, it is characterized in that, described eMSC notifies the described UE of described MME to exist CS speech business and PS data service to comprise simultaneously: described eMSC sends described CS to PS handoff request message to described MME, and described CS carries the professional indication of PS that the described UE of indication exists CS speech business and PS data service simultaneously in PS handoff request message.
6. method according to claim 1 is characterized in that, described MME notifies described UE to switch to described PS territory network by described CS territory network to comprise:
Described MME sends CS to PS handover acknowledge message to described eMSC;
Described eMSC sends switching preparation response message to described UTRAN or GERAN;
Described UTRAN or GERAN send switching command receiving described switching preparation response message and described PS after the handover acknowledge message of PS handoff request message to described UE, notify described UE to switch to described PS territory network.
7. method according to claim 6 is characterized in that, described PS carries the contextual information of described UE in the PS handoff request message, comprises the information of the default bearer of described UE in the described contextual information; It is that described UE preparation Internet resources comprise that described MME notifies the network element of described PS territory network:
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 the default bearer of described UE is created in request;
Step 3, described S-GW is that described default bearer distributes bearing resource, returns to described MME and creates the conversation request response message, carries the IP address of described UE in this establishment conversation request response message;
Step 4, described MME sends handoff request message to the UTRAN of evolution, the interface-free resources of notifying the UTRAN of described evolution to distribute described default bearer;
Step 5, described MME receives the handover acknowledge message that the UTRAN of described evolution returns, and wherein, carries the access parameter of described interface-free resources in the described handover acknowledge message.
8. method according to claim 7 is characterized in that, it is one of following that the user profile that described MME obtains described UE comprises:
Described MME obtains the user profile of the local described UE that preserves;
Described MME parses the user profile of described UE from described PS to PS handoff request message;
Described MME obtains the user profile of described UE to the home network server of described UE according to the sign of described UE.
9. method according to claim 6 is characterized in that, described CS prepares to carry in response message and the described switching command access parameter of described interface-free resources to PS handover acknowledge message, described switching; After described UE sends switching command, described method also comprises: described UE is linked into described PS territory network according to the access parameter of described interface-free resources.
10. method according to claim 7 is characterized in that, carries the described IP address that promising described UE distributes in described handover acknowledge message and the described CS to PS handover acknowledge message.
11. method according to claim 10 is characterized in that, described eMSC also comprised before described UTRAN/GERAN sends switching preparation response message:
Described eMSC distributes IP address and the port numbers that described medium connect that be used for of described eMSC;
Described UE or described eMSC be according to the IP address of opposite end, adopts described default bearer to set up described UE and be connected with medium between the described eMSC;
Transmitting described UE by the Internet resources that distribute for described UE comprises with media data between the far-end: is connected the media data that transmits between described UE and the far-end by described medium.
12. method according to claim 11 is characterized in that, described eMSC links to each other with described UTRAN or GERAN by source MSC; When setting up described UE and medium between the described eMSC are connected, also comprise: described eMSC sets up and is connected with the medium of described far-end, and perhaps, circuit domain is carried between described eMSC foundation and described source MSC.
13. a single channel voice continuity is realized system, it is characterized in that, comprising:
UTRAN or GERAN are used to notify eMSC to prepare UE is switched to PS territory network by CS territory network;
Described eMSC is used to judge whether described UE exists CS speech business and PS data service simultaneously, if then notify the described UE of MME of described PS territory network to have CS speech business and PS data service simultaneously;
Described MME, be used for receiving after described eMSC indicates described UE to have the notice of CS speech business and PS data service simultaneously, the CS that receives described UE to the PS of PS handoff request message and described UE after PS handoff request message, the network element of notifying described PS territory network is that described UE prepares Internet resources, so that after UE switches to described PS territory network, by described PS territory network is that described Internet resources that described UE prepares transmit the media data between described UE and the far-end, and described MME also is used for notifying described UE to switch to described PS territory network by described CS territory network.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201010174079.1A CN102238679B (en) | 2010-05-04 | 2010-05-04 | Single radio voice call continuity realization method and system |
| PCT/CN2011/072893 WO2011137716A1 (en) | 2010-05-04 | 2011-04-15 | Method and system for implementing single radio voice call continuity |
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| CN201010174079.1A CN102238679B (en) | 2010-05-04 | 2010-05-04 | Single radio voice call continuity realization method and system |
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| CN102238679B CN102238679B (en) | 2016-01-20 |
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| WO2013033914A1 (en) * | 2011-09-09 | 2013-03-14 | 华为技术有限公司 | Method and device for srvcc handover |
| WO2016029479A1 (en) * | 2014-08-30 | 2016-03-03 | 华为技术有限公司 | Voice service bearer switching method, relevant apparatus and system |
| CN105557020A (en) * | 2014-04-08 | 2016-05-04 | 华为技术有限公司 | Call hold method and user equipment |
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| WO2006092769A1 (en) * | 2005-03-03 | 2006-09-08 | Nokia Corporation | A method for handover of dedicated and shared resources for a mobile station in dual transfer mode |
| CN101242643A (en) * | 2007-02-09 | 2008-08-13 | 华为技术有限公司 | Dual-transmission mode switching method and universal access network controller |
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Also Published As
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| WO2011137716A1 (en) | 2011-11-10 |
| CN102238679B (en) | 2016-01-20 |
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