CN102238678A - Method and system for implementing single radio voice call continuity (SRVCC) - Google Patents
Method and system for implementing single radio voice call continuity (SRVCC) Download PDFInfo
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Abstract
The invention discloses a method and system for implementing single radio voice call continuity (SRVCC). The method comprises the following steps that: a universal mobile telecommunication system radio access network (UTRAN) or a GSM EDGE radio access network (GERAN) informs a mobility management entity (MME) of a packet switch (PS) domain network of preparation for switching user equipment (UE) from a circuit switch (CS) domain network to the PS domain network via an enhanced mobile switch center (eMSC); the MME determines that the PS domain network does not have the bearer of the UE, requests a packet data network gateway (P-GW) of the PS domain network to create the bearer for the UE and informs the evolved UTRAN (E-UTRAN) to distribute air interface resources to the bearer; the MME informs the UE of switching to the PS domain network via the CS domain network; and after the UE is switched to the PS domain network, the air interface resources distributed by the E-UTRAN are utilized to transmit the voice media between the UE and the remote end via the bearer created for the UE. The method and the system have the following beneficial effects: the wait time before the voice call restoration can be saved, the voice interruption time can be reduced and the user experience can be improved.
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), gateway (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 Supporting Node, abbreviate SGSN as), charging and policy control entity (Policy and Charging RuleFunction, 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.
Figure 1B 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. 2 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:
201, the wireless measurement report that reports of the network based SR UE of GERAN/UTRAN, decision is initiated to switch to E-UTRAN;
202, GERAN/UTRAN sends handoff request message (HORequired) to Source MSC, carries the Target Cell Identifier of definite object E-UTRAN network in the message;
203, 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;
204, 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.
205, 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;
206, Source MSC returns handover acknowledge message (HO Response) to source GERAN/UTRAN network, carries the network insertion indication in the message;
207, 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;
208, 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.
209, 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;
210, after carrying was set up and finished, SR UE registered to user ascription area IMS network;
211, 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;
212, 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 radio voice call continuity implementation method, after SR UE switches to the E-UTRAN network, speech communication between SR UE and far-end is temporarily interrupted, SR UE registers to user ascription area IMS network after the E-UTRAN network is set up required carrying again, also need carry out far-end at step 310-312 after succeeding in registration and upgrade operation, after far-end execution renewal operation is finished, just recover the speech communication between SR UE and far-end.Thereby cause the dropped calls overlong time, reduced user's experience.
Summary of the invention
Main purpose of the present invention is to provide a kind of single channel oppositely the voice continuity implementation method and the system of switching, 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 prepare UE is switched to PS territory network by CS territory network by the MME of eMSC notice PS territory network; MME determines that there is not the carrying of this UE in PS territory network, and request PS territory grouping of network data network gateway is created carrying for this UE, and notice E-UTRAN distributes interface-free resources for this carrying; MME switches to PS territory network by CS territory network notice UE; After UE switches to PS territory network, utilize interface-free resources that the UTRAN of evolution distributes to transmit voice medium between UE and the far-end by the carrying of creating for this UE.
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 notify the MME of PS territory network to prepare UE is switched to PS territory network; MME, be used to judge whether PS territory network exists the carrying of this UE, be judged as under the situation not, request PS territory grouping of network data network gateway is that UE creates carrying, and after the response that receives the load creating success that grouped data network gateway returns, the UTRAN of notice evolution distributes interface-free resources for this carrying, and switches to PS territory network by CS territory network notice UE; Grouped data network gateway is used to UE to create carrying, after UE switches to described PS territory network, by the voice medium between this carrying transmission UE and the far-end; The UTRAN of evolution, the above-mentioned carrying that is used to grouped data network gateway to create distributes interface-free resources, so that after UE switches to PS territory network, by the voice medium between this carrying transmission UE and the far-end.
By the present invention, switch in the process of PS territory network by CS territory network at single channel UE, before UE switches to PS territory network, PS territory network is that UE distributes carrying and interface-free resources, after UE switches to PS territory network, be utilized as carrying and interface-free resources transmission voice medium that UE distributes, thereby can save the time of waiting for before voice call recovers, reduce the voice interruption time, 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:
Figure 1A is an EPS system architecture schematic diagram in the correlation technique;
Figure 1B is the single radio voice call continuity Organization Chart in the correlation technique;
Fig. 2 is the flow chart that the single mode voice business continuity switches packet-switched domain in the correlation technique from circuit commutative field;
Fig. 3 is a structural representation of realizing system according to the single channel voice continuity of the embodiment of the invention one;
Fig. 4 is the configuration diagram according to the optimum decision system of the embodiment of the invention one;
Fig. 5 is the flow chart according to the reverse voice continuity implementation method of switching of single channel of the embodiment of the invention one;
Fig. 6 is the flow chart according to the embodiment of the invention two.
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. 3 is a structural representation of realizing system according to the single channel voice continuity of the embodiment of the invention one, comprising: UTRAN/GERAN 10, eMSC 20, MME 30, grouped data network gateway (comprising S-GW and P-GW) 40 and E-UTRAN 50.Wherein, UTRAN/GERAN 10, are used to notify eMSC 20 to prepare UE is switched to the PS territory network that is inserted by E-UTRAN 50 by CS territory network; EMSC 20, are used to notify the MME 30 of PS territory network to prepare UE is switched to PS territory network; MME 30, be used to judge whether current PS territory network exists the carrying of UE, be judged as under the situation not, ask this PS territory grouping of network data network gateway 40 to create carrying for UE, and after receiving the load creating success response that grouped data network gateway 40 returns, notice E-UTRAN distributes interface-free resources for this carrying, and switches to PS territory network by source network (being CS territory network) notice UE; Grouped data network gateway 40 is used to UE to create carrying, after UE switches to PS territory network, by the voice medium between this carrying transmission UE and the far-end; E-UTRAN 50, and the carrying that is used to grouped data network gateway 40 to create distributes interface-free resources, so that after UE switches to PS territory network, by the voice medium between this carrying transmission UE and the far-end.
In the present embodiment, if MME 30 judges current PS territory network and has the carrying of UE, then do not need notice packet data network gateway 40 to create carrying, do not need to notify E-UTRAN 50 to distribute interface-free resources yet, after UE switches to PS territory network, utilize the voice medium between this carrying transmission UE and the far-end.
In the correlation technique after UE switches to objective network, UE creates required carrying at objective network again, and then after user ascription area IMS network succeeds in registration and far-end carry out upgraded operation, just recover the speech communication between UE and far-end, thereby cause the voice interruption time longer.And in the system that present embodiment provides, when the handoff procedure of SR UE being carried out by CS territory to PS territory, before notice UE switches to objective network, MME 30 first notification target grouping of network data network gateway 40 and E-UTRAN 50 carry out the process of load creating and resource allocation, thereby can reduce the time of voice interruption between UE and far-end, improve user experience.
An interchangeable embodiment as present embodiment, source MSC does not have the enhancing ability, therefore, the single channel voice continuity of this embodiment realizes that system also comprises source MSC 60, carry out interacting message by source MSC 60 between UTRAN/GERAN 10 and the eMSC 20, Fig. 4 is the optimum decision system configuration diagram according to present embodiment.In Fig. 4, conventional eMSC 20 is expanded, this eMSC 20 receive handover preparation request message that source MSC 60 sends can be according to message in Target cell forwards to target MME 30; MME 30 can be used for after the message that receives eMSC 20, and request target network (being PS territory network) is created carrying for UE, and distributes interface-free resources, and switches to PS territory network by source MSC 60, eMSC 20, UTRAN/GERAN 10 by UE.
By this preferred embodiment, can not possess under the situation of enhancing ability at source MSC 60, before UE switches to objective network, at objective network is that UE creates carrying, and distribution interface-free resources, thereby guaranteed that source MSC 60 does not possess under the situation of enhancing ability, also can reduce the break period of the conversation between UE and the far-end.
Fig. 5 is the flow chart according to the single channel voice continuity implementation method of the embodiment of the invention one, and this method is used for keeping voice continuous at UE from the process that CS territory network switches to PS territory network, mainly may further comprise the steps (step S502-step S508):
Step S502, UTRAN/GERAN prepares UE is switched to PS territory network by CS territory network by the MME of eMSC notice PS territory network;
For example, source MSC is the MSC (being eMSC) of enhancement mode, then UTRAN/GERAN reports according to the wireless measurement that UE reports, decision is initiated to insert between network and is switched, sending handoff request message informing eMSC to eMSC prepares UE is switched to objective network, eMSC sends notice to MME again, and notice is prepared UE is switched to objective network; 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, send switching preparation message informing eMSC to eMSC and prepare UE is switched to objective network, eMSC reinforms MME.
Step S504, MME determine that there is not the carrying of this UE in PS territory network, and request PS territory grouping of network data network gateway (comprising S-GW and P-GW) is created carrying for this UE, and notice E-UTRAN distributes interface-free resources for this carrying;
For example, MME can be according to the identify label of the UE that carries in the message of the UTRAN/GERAN that receives by the eMSC transmission, determine that there is not the carrying of this UE in PS territory network, then MME can check further whether this UE registers in MME, if thereby do not have, the HSS of MME under this UE (for example sends position updating request, Update Location Request) obtains user contracting data, HSS (for example upgrades response message to the MME home position, Update Location Ack), the user contracting data that carries in the message comprises packet data network (Packet Data Network the abbreviates PDN as) contextual information of UE and sets up default bearer relevant information QoS.
MME is according to the S-GW and the P-GW of the user contracting data select target network of UE, and the S-GW/P-GW in objective network sends and creates conversation request message (for example, Create Session Request), creates default bearer.In the establishment conversation request response message (for example, Create Session Response) that receives from S-GW/P-GW, MME sends handoff request message (for example, HO Request) to E-UTRAN, and notice E-UTRAN distributes the Radio Resource of this carrying.Receiving E-UTRAN handover acknowledge message (HO ACK), returning CS to PS handover acknowledge message (CS to PSHO Response), carrying in the message and insert the access parameter of assigned radio resource to eMSC.After UE switches to objective network, also can be by the speech data between this dedicated bearer transmission UE and the far-end.
Preferably, MME can also carry single channel voice continuity sign (SRVCC Indicator in the establishment conversation request message that S-GW/P-GW sends, abbreviate SI as), S-GW/P-GW is receiving the establishment conversation request message according to SI, is that UE distributes the voice dedicated bearer; S-GW/P-GW carries this dedicated bearer in the establishment session response message of returning to MME sign, the sign that MME carries this dedicated bearer in the handoff request message that sends to E-UTRAN, notice E-UTRAN distributes the Radio Resource of this dedicated bearer.After UE switches to objective network, also can be by the speech data between this dedicated bearer transmission UE and the far-end.
Step S506, MME switches to PS territory network by source network (being CS territory network) notice UE;
For example, MME sends CS to PS handover acknowledge message to eMSC, eMSC returns to switch to source MSC and prepares response message, source MSC returns handover acknowledge message (perhaps to GERAN/UTRAN, if source MSC has the enhancing ability, then eMSC and source MSC are same entity, and eMSC directly returns handover acknowledge message to GERAN/UTRAN), GERAN/UTRAN switches to EUTRAN by switching command message notice UE.Wherein, above-mentioned CS to PS handover acknowledge message, switching prepare to carry in response message and the switching command message access parameter of EUTRAN assigned radio resource, and UE is linked into PS territory network according to the access parameter of this Radio Resource resource.
After step S508, UE switched to PS territory network, it was the carrying transmission UE of UE establishment and the voice medium between the far-end that the interface-free resources of utilizing E-UTRAN to distribute is passed through.
For example, UE and eMSC can be by mutual mutual IP address and the port numbers of above-mentioned flow process, UE or eMSC are according to the IP address and the port numbers of opposite end, can be connected with one section interim medium of establishment between the eMSC at UE, connect by these medium, transmission UE switches to behind the network of PS territory the voice medium with far-end, can further reduce the time of voice interruption like this.
Perhaps, also can not create interim medium between UE and eMSC connects, but according to flow performing shown in Figure 2, difference is, after UE switches to PS territory network, because objective network is created carrying for UE, therefore do not need again execution in step 209, after the IMS distant end media was upgraded successfully, the carrying (lacking carrying or dedicated bearer) that utilizes step S504 to create was set up and is switched rear path, the voice medium between transmission UE and the far-end.
Above-mentioned single channel voice continuity implementation method by present embodiment, can be before UE switches to objective network, at objective network is that UE creates carrying, the problem of having avoided creating carrying again after UE switches to objective network and having caused speech communication lengthening break period has improved user experience.
Embodiment two
Present embodiment described for SR UE when the circuit domain speech business only takes place in the GERAN/UTRAN network, switch to the flow process of EUTRAN network by GERAN/UTRAN.Fig. 6 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:
601.GERAN/UTRAN according to the wireless measurement report that SR UE reports, decision is initiated to insert between network and is switched;
602.GERAN/UTRAN send handoff request message to Source MSC, the destination address location cell is a target EUTRAN network cell in the message;
After 603.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 in this message, and User Identity such as IMSI, if Source MSC judges the current resident SGSN address of UE is arranged in this equipment, the SGSN address is also contained in the message;
604.eMSC receive to switch and prepare message, according to Target cell, select MME, send CS to PS handoff request message to it, carry cell-of-origin and target cell information in the message, User Identity such as IMSI if receive the SGSN address, are also contained in the message.
If wherein Source MSC and eMSC are same entity, then do not need to transmit the message between above-mentioned Source MSC and the eMSC;
605.MME receive CS to PS handoff request message, judge in the message of whether preserving user profile in its this locality and receiving whether the SGSN address is arranged, if the both does not have, MME obtains user contracting data according to User Identity to HSS, for example, contextual information of user etc.;
If 606. MME judges in the message of receiving the SGSN address information is arranged, MME obtains user context information to SGSN;
607-608, MME select the S-GW and the P-GW of service according to user context information, send to S-GW/P-GW and create conversation request, create EPS network default bearer, carry in the message single mode voice continuity sign (SRVCC Indicator, SI);
609.P-GW after receiving the establishment conversation request, distribute the default bearer resource, be UE distributing IP address, indicate according to the SI in the message, distribute the voice dedicated bearer, after establishment finishes, P-GW allocation of downlink TFT (Down Link TFT, DL TFT) and termination point of a tunnel identifier (Tunnel Endpoint Identifier, TEID), and the binding both sides relation, wherein, TEID is used to identify the carrying that is distributed.DL TFT is used for P-GW and selects institute to distribute to carry the external data bag that receives is passed to user terminal, and wherein, it is the network default value that UE side IP port numbers is set among the DL TFT;
610.P-GW return the establishment session response message to S-GW, IP address that carrying connected of carrying the P-GW distribution in the message and port numbers, bearing identification TEID tabulation, DL TFT and UE IP relevant information;
611.S-GW after receiving the establishment conversation request of P-GW, tabulation distributes corresponding resource according to TEID, and return to MME and to create the conversation request response message, carry the IP address and the port numbers that carrying was connected of P-GW and S-GW distribution in the message, bearing identification TEID tabulation, DL TFT and UE IP relevant information;
If 604 steps, MME checks out that UE adheres to registration at this network, and the default bearer of UE is set up, and then directly jumps to 612 steps from 604 steps;
After 612.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 in the carrying of 607-611 establishment, and S-GW user's face connects the link address of EUTRAN.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;
613.MME return CS to PS handover acknowledge message to eMSC, carry EUTRAN interface-free resources access parameter in the message, the IP address of UE and DL TFT;
614.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 DL TFT address generates speech business flow template (Traffic Flow Template, TFT), this template be used to indicate UE and eMSC set up SR UE with before the IMS distant end media is upgraded successfully between eMSC medium be connected and receive/send voice medium.TFT comprises UE side and eMSC side IP address and port numbers, the UE side ports be provided with DL TFT in value;
615.eMSC return and switch to prepare response message and give Source MSC, carry the TFT that 614 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 616a.Source MSC receives to switch, set up CS carrying between Source MSC and eMSC according to Handover Number;
616b. or eMSC is in 615 steps, eMSC returns to switch and prepares not carry Handover Number in the response message, is initiated to upgrade the far-end flow process by eMSC, distant end media is updated to eMSC link to each other, and promptly sets up eMSC and is connected with medium between the far-end;
In actual applications, the arbitrary steps that can select to carry out among above-mentioned 616a and the 616b is carried out.
617.Source MSC returns handover acknowledge message to GERAN/UTRAN, carries EUTRAN eat dishes without rice or wine access parameter and TFT in the message;
618.GERAN/UTRAN by switching command message, notice SR UE switches, and carries EUTRAN eat dishes without rice or wine access parameter and TFT in the message;
619.SR UE switches to the EUTRAN network according to the EUTRAN access parameter of eating dishes without rice or wine;
620.SR UE sends handoff completion message to the EUTRAN network;
621.EUTRAN receive handoff completion message, by handoff notification message notice MME;
622.MME return handoff completion message to eMSC, eMSC notifies SourceMSC;
623.Source MSC receives the handoff completion message of objective network, discharges the Radio Resource of GERAN/UTRAN network (being CS territory network);
Be connected 624.eMSC set up both medium with SR UE, SR UE receives and sends the ip voice packet according to voice TFT;
These medium connect and comprise two parts: be connected to the IP Data-carrying between eMSC of first 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.EMSC is after receiving handoff completion message, directly send voice packet according to voice TFT to SR UE, eMSC is receiving that the circuit domain VoP of Source MSC is converted to the IP packet, connect according to the medium of TFT by between the two and to send to SR UE, receive ip voice packet simultaneously from SR UE, be converted to the circuit domain voice packet and be transmitted to Source MSC, SR UE receives and sends the ip voice packet according to voice TFT;
If 625. SR UE does not register at IMS as yet, SR UE carries out the IMS registration to this user ascription area IMS;
626. 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;
627. 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 628. discharge, and UE initiates to discharge dedicated bearer, and eMSC receives Source MSC release message, discharge medium and connect IP and port.
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 default bearer and the voice of UE, and in setting up the process of default bearer, be UE distributing IP address, thereby reduced the time of voice interruption in the handoff procedure.
From above description, as can be seen, in embodiments of the present invention, switch in the process of PS territory network by CS territory network, before UE switches to PS territory network at single channel UE, PS territory network is that UE distributes carrying and interface-free resources, after UE switches to PS territory network, be utilized as carrying and interface-free resources transmission voice medium that UE distributes, thereby can save the time of waiting for before voice call recovers, reduce the voice interruption time, 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 (12)
1. a single channel voice continuity implementation method is used for keeping voice continuous at subscriber equipment from the process that circuit switching (CS) territory network switches to packet switching PS 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 prepare user terminal UE is switched to described PS territory network by CS territory network by the Mobility Management Entity MME that strengthens the eMSC of mobile switching centre notice PS territory network;
Described MME determines that there is not the carrying of described UE in described PS territory network, and asking described PS territory grouping of network data network gateway is that described UE creates carrying, and the UTRAN of notice evolution is that described carrying distributes interface-free 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, utilize interface-free resources that the UTRAN of described evolution distributes to transmit voice medium between described UE and the far-end by the carrying of creating for described UE.
2. method according to claim 1 is characterized in that,
Described UTRAN or GERAN notify described MME to prepare that UE is switched to described PS territory network by CS territory network by described eMSC to comprise:
Described UTRAN or GERAN are by source MSC or directly send handover preparation request message to described eMSC, notify described eMSC to prepare described UE is switched to described PS territory network by CS territory network;
Described eMSC parses the positional information of Target cell from described handover preparation request message, select described MME according to described positional information, send CS to PS handoff request message to described MME, described CS carries the identify label of described UE in the PS handoff request message;
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 is by source MSC or directly return switching preparation response message to described UTRAN or GERAN;
Described UTRAN or GERAN notify described UE to switch to described PS territory network by switching command message.
3. method according to claim 2 is characterized in that, described MME determines not exist the carrying of described UE, and asking described grouped data network gateway is that described UE creates carrying, and the UTRAN of notice evolution is that described carrying distributes interface-free resources to comprise:
Described MME determines that according to the identify label of described UE described UE does not register in described MME;
Described MME obtains contracted user's data of described UE, selects described grouped data network gateway according to described subscription data;
Described MME sends to described grouped data network gateway and creates conversation request message, and asking described grouped data network gateway is that described UE creates default bearer;
Described MME receives the establishment conversation request response message that described grouped data network gateway returns;
Described MME sends handoff request message to the UTRAN of described evolution, the interface-free resources of notifying the UTRAN of described evolution to distribute described default bearer;
Described MME receives the handover acknowledge message that the UTRAN of described evolution returns, and the signal in the described handover acknowledge message has the access parameter of described interface-free resources.
4. method according to claim 3 is characterized in that, described CS prepares to carry in response message and the described hand off signaling message 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.
5. method according to claim 3 is characterized in that, it is one of following that contracted user's data that described MME obtains described UE comprise:
Described MME obtains contracted user's data of the local described UE that preserves;
Parse the address of Serving GPRS Support Node SGSN the handoff request message of described MME from described CS territory to the PS territory, obtain the user profile of described UE from described SGSN;
Described MME obtains the user profile of described UE to the home network server of described UE according to the identify label of described UE.
6. method according to claim 3 is characterized in that, carries single channel voice continuity sign SI in the described establishment conversation request; Then at described MME after described grouped data network gateway sends described establishment conversation request message, described method also comprises: described grouped data network gateway parses described SI from described establishment conversation request, according to the indication of described SI, for described UE creates the voice dedicated bearer.
7. method according to claim 6, it is characterized in that also carrying the termination point of a tunnel identifier list that is used to identify the carrying that described grouped data network gateway distributes, IP address that described grouped data network gateway inserts described carrying and port numbers and described grouped data network gateway in the described establishment conversation request response message is described UE IP address allocated.
8. method according to claim 7 is characterized in that, carries described termination point of a tunnel identifier list in the described handoff request message; Described MME is after the UTRAN of described evolution sends described handoff request message, and described method also comprises: the UTRAN of described evolution is that the carrying that each termination point of a tunnel identifier is identified in the described termination point of a tunnel identifier list distributes interface-free resources.
9. method according to claim 7, it is characterized in that described CS prepares to carry the IP address of described UE and IP address and the port numbers that described grouped data network gateway inserts described carrying in response message and the described switching command message to PS handover acknowledge message, described switching.
10. method according to claim 9, it is characterized in that, send CS at described MME after PS handover acknowledge message to described eMSC, described method also comprises: described eMSC distributes IP address and the port numbers that described UE is connected with medium between the described eMSC that be used for of described eMSC;
Described switching prepares to carry in response message and the described switching command IP address and the port numbers that described medium are connected that be used for of described eMSC;
Utilize the interface-free resources of the UTRAN distribution of described evolution to comprise by the voice medium that transmits between described UE and the far-end for the carrying of described UE establishment:
Described UE or described eMSC be according to the IP address of its IP address and opposite end, is utilized as the described carrying that described UE creates, and creates described UE and be connected with medium between the described eMSC;
Connect the voice medium that transmits between described UE and the described far-end by described medium.
11. 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 notify the MME of described PS territory network to prepare described UE is switched to PS territory network;
Described MME, be used to judge whether described PS territory network exists the carrying of described UE, be judged as under the situation not, asking described PS territory grouping of network data network gateway is that described UE creates carrying, and after the response that receives the load creating success that described grouped data network gateway returns, the UTRAN of notice evolution is that described carrying distributes interface-free resources, and notifies described UE to switch to described PS territory network by described CS territory network;
Described grouped data network gateway is used to described UE to create carrying, after described UE switches to described PS territory network, transmits voice medium between described UE and the far-end by described carrying;
The UTRAN of described evolution, the described carrying that is used to described grouped data network gateway to create distributes interface-free resources, so that after described UE switches to described PS territory network, transmits voice medium between described UE and the described far-end by described carrying.
12. system according to claim 11 is characterized in that, described grouped data network gateway is that the carrying that described UE distributes comprises default bearer and voice dedicated bearer.
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| CN201010173990.0A CN102238678B (en) | 2010-05-04 | 2010-05-04 | Single radio voice call continuity realization method and system |
| PCT/CN2011/072887 WO2011137715A1 (en) | 2010-05-04 | 2011-04-15 | Method and system for realizing single radio voice call continuity |
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| CN201010173990.0A CN102238678B (en) | 2010-05-04 | 2010-05-04 | Single radio voice call continuity realization method and system |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013127136A1 (en) * | 2012-02-29 | 2013-09-06 | 中兴通讯股份有限公司 | Voice service switching method and device |
| CN104322103A (en) * | 2012-04-11 | 2015-01-28 | 诺基亚通信公司 | Network sharing and reverse single radio voice call continuity |
| US10080162B2 (en) | 2012-04-11 | 2018-09-18 | Nokia Solutions And Networks Oy | Network sharing and reverse single radio voice call continuity |
| CN109951879A (en) * | 2017-12-21 | 2019-06-28 | 中国移动通信集团设计院有限公司 | A kind of penalty method and evolution base station of ESRVCC handoff preparation phase |
| CN110099052A (en) * | 2012-02-22 | 2019-08-06 | Lg 电子株式会社 | Method and apparatus in wireless communication system for supporting voice service |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN101370261A (en) * | 2007-08-15 | 2009-02-18 | 华为技术有限公司 | Resource preparation method and communication equipment for switching from CS field to PS field |
| CN101374333A (en) * | 2007-08-23 | 2009-02-25 | 华为技术有限公司 | System, apparatus and method for switching user service |
| CN101472311A (en) * | 2007-12-29 | 2009-07-01 | 华为技术有限公司 | Method, equipment and system for switching voice business |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101227677B (en) * | 2008-02-05 | 2011-06-22 | 中兴通讯股份有限公司 | Single wireless channel voice business continuity field switching method |
| CN101459939B (en) * | 2008-03-28 | 2011-03-16 | 中兴通讯股份有限公司 | Domain switching method |
-
2010
- 2010-05-04 CN CN201010173990.0A patent/CN102238678B/en not_active Expired - Fee Related
-
2011
- 2011-04-15 WO PCT/CN2011/072887 patent/WO2011137715A1/en active Application Filing
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN101370261A (en) * | 2007-08-15 | 2009-02-18 | 华为技术有限公司 | Resource preparation method and communication equipment for switching from CS field to PS field |
| CN101374333A (en) * | 2007-08-23 | 2009-02-25 | 华为技术有限公司 | System, apparatus and method for switching user service |
| CN101472311A (en) * | 2007-12-29 | 2009-07-01 | 华为技术有限公司 | Method, equipment and system for switching voice business |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110099052A (en) * | 2012-02-22 | 2019-08-06 | Lg 电子株式会社 | Method and apparatus in wireless communication system for supporting voice service |
| WO2013127136A1 (en) * | 2012-02-29 | 2013-09-06 | 中兴通讯股份有限公司 | Voice service switching method and device |
| CN104322103A (en) * | 2012-04-11 | 2015-01-28 | 诺基亚通信公司 | Network sharing and reverse single radio voice call continuity |
| US10080162B2 (en) | 2012-04-11 | 2018-09-18 | Nokia Solutions And Networks Oy | Network sharing and reverse single radio voice call continuity |
| CN104322103B (en) * | 2012-04-11 | 2018-12-28 | 诺基亚通信公司 | Network share and reversed single wireless electricity voice call continuity |
| CN109951879A (en) * | 2017-12-21 | 2019-06-28 | 中国移动通信集团设计院有限公司 | A kind of penalty method and evolution base station of ESRVCC handoff preparation phase |
Also Published As
| Publication number | Publication date |
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| WO2011137715A1 (en) | 2011-11-10 |
| CN102238678B (en) | 2016-01-20 |
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