CN101431747B - Method, system and apparatus for determining voice call continuity technology call - Google Patents
Method, system and apparatus for determining voice call continuity technology call Download PDFInfo
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Abstract
The invention discloses a judging method, system and device of voice calling continuous technology VCC calling. The judging method of the voice calling continuous technology calling comprises the following steps: obtaining VCC calling judging message; judging whether a calling is a VCC calling according to the VCC calling judging message; if it is, sending VCC calling indication message to the access network entity. According to the embodiment of the invention, under the condition with different voice calling carries, according to the obtained VCC calling judging message, a calling is judged whether is a VCC calling and the judging result is informed to the access network entity, thereby the access network is able to control UE and execute the measurement related to VCC domain switching and inform the indication announcement to the target access network in the following switching process, such that the following VCC domain switching is executed to ensure the continuity of voice calling between IMS carry and CS domain carry.
Description
Technical field
The present invention relates to communication technical field, particularly a kind of decision method of voice call continuity technology call, system and device.
Background technology
2G/3G (2nd Generation/3rd Generation, second generation mobile communication technology/3G (Third Generation) Moblie technology) network can be regarded a kind of comprehensive covering as to a certain extent through for many years deployment; Along with SAE (System Architecture Evolution, System Architecture Evolution)/LTE (Long TermEvolution, Long Term Evolution); HSPA (High Speed Packet Access; High-speed packet inserts), HSPA+ (High Speed Packet Access Evolution, high-speed packet inserts evolution) and WiMAX (Worldwide Interoperability for Microwave Access; Micro-wave access global inter communication) development of internet technology; These network-covereds are to some cities and traffic hot zones, and in present communication network, these networks and 2G/3G network are also deposited.For the purpose of describing conveniently, PS (PacketSwitched, packet switching) will only be provided the SAE/LTE in territory, HSPA, HSPA+, WiMAX etc. are referred to as pure PS territory network.
To the various network carrying mechanism, can the audio call of mobile communication be divided into following several types:
The first kind is the session service that carry in CS (Circuit Service, circuit domain business) territory, like voice call;
Second type is the session service that carry in the PS territory; Be also referred to as VoIP (Voice over IP; The Voice over IP technology) type business provides QoS (Quality of Service by IMS (IP Multimedia Subsystem, IP multimedia service subsystem); Service quality) guarantee, like the voice call of IP carrying.
Audio call can only carry transmission in the PS territory of pure PS network, and IMS controls audio call through IP-based network.In the 2G/3G network, audio call generally all is to be carried on the CS territory.
The user who makes a call is in the call process; Might cross over a plurality of networks, because the difference of load-bearing of mobile telecommunication business mechanism causes moving out pure PS territory network base station institute coverage as UE; When getting into the 2G/3G network base station area of coverage; Being interrupted of IMS audio call may occur, thereby influence the continuity that user speech is called out, vice versa
In order to address the above problem; Guarantee the continuity that user speech is called out; Adopt SRVCC (SingleRadio Voice Call Continuity, single Radio Link continuous voice call technology) technical scheme to solve the continuity problem that is carried on the IMS audio call on the network of pure PS territory and is carried on audio call between the CS territory at present.
Prior art it is generally acknowledged in the SRVCC technical scheme by Access Network and is judged whether the start VCC territory transfer process of (Voice Call Continuity, continuous voice call technology).Having only a calling is that VCC calls out that just possibly utilize should technology, and so-called VCC calls out and is meant that an audio call is anchored on the VCC AS of IMS (Voice Call Continuity Application Server, voice continuity application server).Therefore, how to judge that whether a calling is the prerequisite that VCC audio call and the technical scheme of notifying Access Network to be based on SRVCC realize voice continuity.
Prior art provides judges the VCC audio call and notifies the method for Access Network to be by CSCF (CallSession Control Function; The CSCF body) judge an audio call whether be VCC call out and with the result through PCRF (Policy and Charging Rules Function; Strategy and charging rule functions body) and EPC (Envolved Packet Core, the packet core of evolution) notify the Access Network of SAE/LTE.This is to realize in the SAE/LTE network that VCC calls out a kind of implementation method of judging and notifying Access Network.
But there are three defectives in this method:
(1) it is many to relate to the network entity of modification, comprises CSCF, PCRF, MME (MobilityManagement Entity, mobile management network element), the PDN GW (Packet Data NetworkGateway, grouped data network gateway) of IMS, realizes complicated;
(2) only consider the realization of SAE/LTE network, do not provided the implementation method of other pure PS territory network;
(3) do not consider the judgement and the Notification Method of CS territory VCC audio call in the 2G/3G network.
Therefore; The shortcoming of prior art is: the technical scheme that existing VCC calls out judgement and notice Access Network implements more complicated; And do not provide the implementation method of other pure PS territory network, do not have the judgement and the Notification Method of CS territory VCC audio call in the 2G/3G network yet.And prior art is not provided in the handoff procedure yet and notifies the method to target access network with the VCC calling indication message, can't guarantee the realization of SRVCC technology in follow-up handoff procedure.
Summary of the invention
Decision method, system and device that the embodiment of the invention provides a kind of VCC to call out with the difference that realizes carrying according to audio call, judge whether a calling is that VCC calls out, and with the result notification Access Network.
For achieving the above object, the decision method that the embodiment of the invention provides a kind of continuous voice call technology VCC to call out on the one hand comprises: obtain VCC and call out determination information; Call out determination information according to said VCC and judge whether a calling is that VCC calls out; Specifically comprise: if said calling is an IP multimedia service subsystem, IMS audio call; When caller or called IMS audio call user are the VCC contracted user; Said IMS audio call anchors to the VCC application server, and then said core network entity judges that said IMS audio call is that VCC calls out; If said calling is a caller circuit domain business CS audio call; Said core network entity is used enhancing logical CAMEL transmission CAMEL Initial Detection Point message to the mobile network of customization; If said caller CS audio call can anchor to the VCC application server, then said core network entity judges that according to the ability information of said user equipment (UE) said caller CS audio call is that VCC calls out; If said calling is called CS audio call, said core network entity confirms that said CS audio call anchors to the VCC application server, judges that then said called CS audio call is that VCC calls out; If then send the VCC calling indication message to access network entity.
On the other hand; The decision-making system that the embodiment of the invention also provides a kind of VCC to call out; Comprise: core network entity is used to obtain VCC and calls out determination information, and calls out determination information according to said VCC and judge whether a calling is that VCC calls out; Specifically comprise: if said calling is an IP multimedia service subsystem, IMS audio call; When caller or called IMS audio call user were the VCC contracted user, said IMS audio call anchored to the VCC application server, and then said core network entity judges that said IMS audio call is that VCC calls out; If said calling is a caller circuit domain business CS audio call; Said core network entity is used enhancing logical CAMEL transmission CAMEL Initial Detection Point message to the mobile network of customization; If said caller CS audio call can anchor to the VCC application server, then said core network entity judges that according to the ability information of said user equipment (UE) said caller CS audio call is that VCC calls out; If said calling is called CS audio call, said core network entity confirms that said CS audio call anchors to the VCC application server, judges that then said called CS audio call is that VCC calls out; If then send the VCC calling indication message; Access network entity is connected with said core network entity, is used to receive the VCC calling indication message that said core network entity sends.
On the one hand, the embodiment of the invention also provides a kind of core network entity, comprising again: the information acquisition module is used to obtain VCC and calls out determination information; Determination module; Be connected with said information acquisition module; The VCC that is used for obtaining according to said information acquisition module calls out determination information and judges that whether a calling is that VCC calls out, and specifically comprises: if said calling is an IP multimedia service subsystem, IMS audio call, when caller or called IMS audio call user are the VCC contracted user; Said IMS audio call anchors to the VCC application server, and then said core network entity judges that said IMS audio call is that VCC calls out; If said calling is a caller circuit domain business CS audio call; Said core network entity is used enhancing logical CAMEL transmission CAMEL Initial Detection Point message to the mobile network of customization; If said caller CS audio call can anchor to the VCC application server, then said core network entity judges that according to the ability information of said user equipment (UE) said caller CS audio call is that VCC calls out; If said calling is called CS audio call, said core network entity confirms that said CS audio call anchors to the VCC application server, judges that then said called CS audio call is that VCC calls out; Sending module is connected with said determination module, is used for judging that at said determination module said calling is after VCC calls out, to send the VCC calling indication message to access network entity.
Compared with prior art; The embodiment of the invention has the following advantages: through the embodiment of the invention; Under the different bearer situation of audio call, call out determination information according to the VCC that obtains and judge that whether a calling is that VCC calls out, and send the VCC calling indication message to access network entity.In handoff procedure, the source Access Network sends to target access network with the VCC calling indication message, thereby can guarantee the realization of SRVCC technical scheme in follow-up handoff procedure.
Fig. 1 is the flow chart of the decision method of embodiment of the invention VCC calling;
Fig. 2 is the message flow chart of the embodiment of the invention one Iu pattern;
Fig. 3 is the message flow chart of the embodiment of the invention one A/Gb pattern;
Fig. 4 is the message flow chart of the embodiment of the invention two Iu patterns;
Fig. 5 is the message flow chart of the embodiment of the invention two A/Gb patterns;
Fig. 6 is the message flow chart of the embodiment of the invention three MSC decision methods one Iu pattern;
Fig. 7 is the message flow chart of the embodiment of the invention three MSC decision methods one A/Gb pattern;
Fig. 8 is the message flow chart of the embodiment of the invention three MSC decision methods two Iu patterns;
Fig. 9 is the message flow chart of the embodiment of the invention three MSC decision methods two A/Gb patterns;
Figure 10 is the message flow chart of the Iu pattern of the embodiment of the invention three UE decision methods;
Figure 11 is the message flow chart of the A/Gb pattern of the embodiment of the invention three UE decision methods;
Figure 12 is the flow chart of the embodiment of the invention four;
Figure 13 is the structure chart of the decision-making system of embodiment of the invention VCC calling.
Since when having only a calling to be the VCC calling, could be by SRVCC technical scheme of the prior art, the continuity of voice when switching between different networks to be implemented in.Therefore; In order to realize the continuity of voice; Will judge at first that for an audio call whether it be that VCC calls out, to Access Network, be the territory transfer process of switching between follow-up possible different networks technology when taking place notice UE startup VCC by Access Network based on the result notification of judging.Hence one can see that, judges that VCC calls out and the notice Access Network is the important prerequisite that the SRVCC technical scheme is achieved.And the source Access Network will be called out court verdict with VCC and notify the purpose Access Network in handoff procedure, is achieved in follow-up switching to guarantee the SRVCC technology.
According to prior art, whether the audio call that IMS carries anchors to the strategy decision of VCC AS by operator.Default strategy is, when all VCC contracted user callers and called audio call all anchor to VCCAS, could make follow-up territory transfer process to realize.The language that carry in the CS territory is professional, and no matter caller still is called, whether anchors to VCC AS and then can only be determined by carrier policy.For this reason, the audio call that carries of embodiment of the invention audio call that will carry IMS and CS territory is distinguished and is treated.
For describing for simplicity, the embodiment of the invention abbreviates the audio call that IMS carries as the IMS audio call, and the audio call that the CS territory is carried abbreviates the CS audio call as.
The embodiment of the invention is judged the IMS audio call and is notified the method for Access Network to be limited to the wireless network of 3GPP; Be GSM (Global System for Mobile communications; Global system for mobile communications)/GPRS (General Packet Radio Service; General packet radio service)/EDGE (EnhancedData Rate for GSM Evolution; The GSM evolution of enhancing data rate), WCDMA (WidebandCode Division Multiple Access, WCDMA inserts)/HSPA/HSPA+, SAE/LTE.The embodiment of the invention judges whether an IMS audio call is that VCC calls out, and based on default VCC strategy, i.e. when caller or called IMS audio call user were the VCC contracted user, then this IMS audio call should anchor to VCC AS.But, in order to make follow-up VCC territory transfer process to be achieved, also should consider the ability of UE, the UE that promptly only has the VCC ability can realize the follow-up VCC territory transfer process that possibly carry out.According to current 3GPP (the 3rd Generation Partner Project; Third generation partner program) protocol specification; The core network entity that in the SAE/LTE network, can obtain user signing contract information and UE ability (comprising the VCC ability) simultaneously is MME (Mobility ManagementEntity, a mobile management entity), in 2G/3G; Be SGSN (Serving GPRS Support Node, service GPRS support node).Therefore, judge that whether the IMS audio call is that VCC calls out and should be core network entity MME (SAE/LTE network) or SGSN (2G/3G) according to the network entity of UE ability notice Access Network.
In embodiments of the present invention, the UE ability comprises the VCC ability of UE.
For caller CS audio call; MSC (Mobile Switching Center; Mobile switching centre) can judge whether this caller CS audio call is anchored on the VCC AS at the establishment stage of audio call, can judge promptly whether a caller CS audio call is that VCC calls out.According to the protocol specification of current 3GPP, also can obtain the UE ability at the establishment stage MSC of audio call, therefore, judge that whether caller CS audio call is that VCC calls out and should be core network entity MSC according to the network entity of UE ability notice Access Network.
For called CS audio call, be the CS territory core network entity MSC, access network entity, or UE can't obtain the information whether this called CS audio call anchors to VCC AS through the prior protocols standard.According to the prior protocols standard; The entity that can obtain the UE ability at called CS audio call establishment stage or after setting up comprises MSC and UE; Therefore; In order to reduce the modification to the existing protocol standard, the embodiment of the invention selects MSC or UE to obtain the information whether called CS audio call anchors to VCC AS through the protocol specification of revising.
In handoff procedure, the source Access Network should be that the information that VCC calls out is notified target access network with an audio call, makes follow-up VCC territory conversion can carry out to guarantee that voice continuity is achieved.
The decision method that the embodiment of the invention provides a kind of VCC to call out; Pass through the embodiment of the invention; Under the different bearer situation of audio call; Call out determination information according to the VCC that obtains and judge that whether an audio call is that VCC calls out, and send the VCC calling indication message to access network entity, is achieved in follow-up handoff procedure to guarantee the SRVCC technical scheme.
As shown in Figure 1, the flow chart of the decision method of calling out for embodiment of the invention VCC specifically may further comprise the steps:
Step S101 obtains VCC and calls out determination information.This VCC calls out determination information and comprises the ability of UE and user's CAMEL-Subscription-Information etc.In embodiments of the present invention, obtain VCC by core network entity and call out determination information.The audio call of mentioning in the embodiment of the invention comprises IMS audio call, caller CS audio call and called audio call.When a calling is called CS audio call, also can call out determination information by the VCC that UE obtain this audio call.
Step S102 calls out determination information according to VCC and judges whether a calling is that VCC calls out.Call out determination information according to the VCC that obtains, whether core network entity is that VCC calls out with regard to calling of decidable.When a calling is called CS audio call, also can calls out determination information according to the VCC that obtains and judge whether a calling be that VCC calls out by UE.
Step S103 is if then send the VCC calling indication message to access network entity.Judging that a calling is that core network entity sent the VCC calling indication message to access network entity after VCC called out, this audio call of notice access network entity is that VCC calls out, so that follow-up SRVCC technical scheme is achieved.Equally, when a calling is called CS audio call, also can in the response message that sends to access network entity, carry the VCC calling indication message by UE, be that VCC calls out to inform this audio call of access network entity.In the audio call process; When owing to reasons such as the mobility of UE and load balancing; When the switching between wireless access system inside or the wireless access system takes place in UE; For the VCC process can be able to carry out and guarantee the continuity of voice, the source access network entity just can be carried the VCC calling indication message in switching message, is that VCC calls out with this audio call of notification target access network entity.
The decision method that above-mentioned VCC calls out; Under different voice call bearer situation; Call out determination information according to the VCC that obtains, core network entity or UE just can judge that whether a calling is that VCC calls out, and notify access network entity with result of determination; Thereby making Access Network possibly control UE carries out and the relevant measurement of VCC territory conversion; And in follow-up handoff procedure, give target access network with this indication notice, make follow-up VCC territory conversion to carry out, thus guarantee IMS carry with the carrying of CS territory between the continuity of audio call.
The embodiment of the invention one provides whether IMS audio call of a kind of judgement is that VCC calls out, and the method for notice access network entity, the VCC calling indication message is sent to access network entity, and the MME/SGSN of core net need make following judgement:
(1), judges whether a calling is audio call according to qos parameter;
(2) judge according to the UE ability whether UE has the VCC ability;
(3) according to default VCC strategy, promptly the VCC contracted user judges from the user signing contract information of HSS/HLR whether this IMS audio call anchors to VCC AS.
The UE ability comes from UE and adheres to/message in lane place/tracking area (Attach/Routing AreaUpdating/Tracking Area Updating) process; Activate Secondary PDP Context request message and carried to be used to judge whether to be the qos parameter of audio call; Through with HSS (HomeSubscriber Server; Home subscriber server)/CAMEL-Subscription-Information that can obtain the user alternately of HLR (Home Location Register, attaching position register).Therefore, no matter be caller or called IMS audio call, after receiving activation Secondary PDP Context request message, core network entity MME/SGSN can both obtain to send to all information about the VCC calling indication message of Access Network.
MME/SGSN only confirming that a calling is IMS audio call, UE when having VCC ability and user for the VCC contracted user, just can carry the VCC calling indication message in the message that service bearer is set up, be the VCC calling with this calling of notice Access Network.
Wherein, in the SAE/LTE system, the message flow of Iu pattern is as shown in Figure 2, specifically may further comprise the steps:
Step S201, UE send and activate the request that Secondary PDP Context request message is set up as service bearer, and this activation Secondary PDP Context request message has comprised judges whether a calling is the qos parameter of audio call.
Step S202, MME/SGSN judge that a calling is the IMS audio call.MME/SGSN obtains user's CAMEL-Subscription-Information from HSS/HLR, thereby can judge whether this user is the VCC contracted user; According to the UE ability that UE in Aattch/ route district/tracing section updating process provides, can judge whether UE has the VCC ability.The result of determination of integrating step S201 again, MME/SGSN judges that a calling is that IMS audio call, this user have the VCC ability for VCC contracted user and UE.
Step S203; At RAB (Radio Access Bearer; RAB) the VCC calling indication message being set in the allocation request message, to be used to indicate this calling be that VCC calls out, and send it to eNB (Envolved NodeB, the NodeB of evolution)/RNC (the Radio Network Controller of Access Network; Radio network controller)/BSC (Base Station Controller, base station controller).
Step S204, the eNB/RNC/BSC of Access Network preserves this information, replys with the RAB assignment response message.
In the 2G/3G system, the message flow of A/Gb pattern is as shown in Figure 3, specifically may further comprise the steps:
Step S301, UE send and activate the request that Secondary PDP Context request message is set up as service bearer, and this activation Secondary PDP Context request message has comprised judges whether a calling is the qos parameter of audio call.
Step S302, SGSN judge that a calling is the IMS audio call.SGSN obtains user's CAMEL-Subscription-Information from HSS/HLR, thereby can judge whether this user is the VCC contracted user; According to the UE ability that UE in the Aattch/ Routing Area Update process provides, can judge whether UE has the VCC ability.The result of determination of integrating step S301 again, SGSN judges that a calling is that IMS audio call, this user have the VCC ability for VCC contracted user and UE.
Step S303, the VCC calling indication message is set in BSS (Base Station Subsystem, base station sub-system) packet flow context is created request message, and to be used to indicate this business be that VCC calls out, and send it to the BSC of Access Network.
Step S304, the BSC of Access Network preserves this information, creates response message with the BSS packet flow context and replys.
The embodiment of the invention two provides a kind of and has judged whether a caller CS audio call is the method that VCC called out and notified access network entity.For caller CS audio call; The MSC of core net is according to the Setup message of initiating audio call; Trigger CAMEL (Customised Applications for Mobile networkEnhanced Logic; The mobile network of customization uses enhancing logical) the caller trigger is to gsmSCF (globalsystem for mobile communications Service Control Function; Global system for mobile communications service controlled function body) sending CAMEL IDP (Initial Detect Point, Initial Detection Point) message is used to judge whether caller CS audio call can anchor to VCC AS.The Attach/ location area updating process of UE provides the ability of UE, can judge the VCC ability of UE in view of the above.Therefore MSC can obtain VCC and call out determination information.
Wherein, in the 2G/3G system, the message flow of Iu pattern is as shown in Figure 4, specifically may further comprise the steps:
Step S401, UE initiate in the CS territory to send Setup message to MSC in the audio call process.MSC can obtain the ability of UE according to this Setup message, judges that UE has the VCC ability.
Step S402, MSC sends CAMEL IDP message to CAMEL, to trigger CAMEL caller trigger.
Step S403, this caller of CAMEL judgement CS audio call can anchor to VCC AS, distributes IMRN (IP Multimedia Routing Number, IP Multimedia Routing Number) in the CAMEL connection message, to carry the message of response steps S402.
Step S404, in conjunction with the VCC ability of UE and the result of determination of step S403, MSC judges that this caller CS audio call is that VCC calls out.This MSC sets up message at service bearer, and for example: the VCC calling indication message is set in the RAB allocation request message, and indicating this caller CS audio call is that VCC calls out, and sends it to the RNC/BSC of Access Network.
Step S405, the RNC/BSC of Access Network preserves this information, and sends the RAB assignment response message and reply.
Wherein, in the 2G/3G system, the message flow of A/Gb pattern is as shown in Figure 5, specifically may further comprise the steps:
Step S501, UE initiate in the CS territory to send Setup message to MSC in the audio call process.MSC can obtain the ability of UE according to this Setup message, judges that UE has the VCC ability.
Step S502, MSC sends CAMEL IDP message to CAMEL, to trigger CAMEL caller trigger.
Step S503, this caller of CAMEL judgement CS audio call can anchor to VCC AS, distributes IMRN in the CAMEL connection message, to carry the message of response steps S502.
Step S504, in conjunction with the VCC ability of UE and the result of determination of step S503, MSC judges that this caller CS audio call is that VCC calls out.This MSC sets up message at service bearer, and for example: the VCC calling indication message is set in the dynamic channel allocation message, and indicating this caller CS audio call is that VCC calls out, and sends it to the BSC of Access Network.
Step S505, the BSC of Access Network preserves this information, and transmission has assigned acknowledgement messaging.
The embodiment of the invention three provides a kind of and has judged whether a called CS audio call is the method that VCC called out and notified access network entity.For called CS audio call, be that MSC or UE can not confirm whether this audio call has anchored to VCC AS through the interaction message of call establishment.MSC and UE are the entities with UE ability, therefore, can be used as candidate's entity of judging that VCC calls out.
MSC obtains the method whether audio call anchors to VCC AS, requires the CAMEL service entities of MSC and VCC AS mutual, and this realizes through CAP (CAMEL Application Part, CAMEL Application Part) agreement.MSC is promptly mutual with the CAMEL service entities of VCC AS after receiving called Setup message, obtains this audio call and whether has been anchored on VCC AS, the VCC calling indication message is carried in the service bearer assignment messages sends to access network entity then.
Wherein, in the 2G/3G system, the message flow of Iu pattern is as shown in Figure 6, specifically may further comprise the steps:
Step S601; MSC receives (the Media Gateway Control Function from MSC/MGCF; The MGCF body) ISUP (Integrated Service Digital Network User Plane; The ISDN user face) IAM (Initial Address Message, initial address message) message, and paging UE.
Step S602, MSC receives beep-page message, and sends Setup message to called end UE after accomplishing coupling of safety-relevant processes.
Step S603, MSC confirm that according to the VCC calling determination information that the CAMEL service entities with VCC AS obtains alternately this called CS audio call anchors to VCC AS after sending Setup message, judge that promptly this called CS audio call is that VCC calls out.
Step S604, the message that MSC sets up at service bearer, for example: the VCC calling indication message is set in the RAB allocation request message, and indicating this called CS audio call is that VCC calls out, and sends it to the RNC/BSC of Access Network.
Step S605, the RNC/BSC of Access Network preserves this information, and sends the RAB assignment response message and reply.
In the 2G/3G system, the message flow of A/Gb pattern is as shown in Figure 7, specifically may further comprise the steps:
Step S701, MSC receive the ISUP IAM message from MSC/MGCF (Media Gateway Control Function, MGCF body), and paging UE.
Step S702, MSC receives beep-page message, and sends Setup message to called end UE after accomplishing coupling of safety-relevant processes.
Step S703, MSC confirm that according to the VCC calling determination information that the CAMEL service entities with VCC AS obtains alternately this called CS audio call anchors to VCC AS after sending Setup message, judge that promptly this called CS audio call is that VCC calls out.
Step S704, the message that MSC sets up at service bearer, for example: it is that VCC calls out that this audio call of VCC calling indication message indication is set in the dynamic channel allocation message, and sends it to the BSC of Access Network.
Step S705, the BSC of Access Network preserves this information, and transmission has assigned acknowledgement messaging.
MSC obtains the another one method whether called CS audio call anchor to VCC AS; S-CSCF (Serving-Call Session Control Function; The service call conversation control function body) at SIP (Session Initial Protocol; Session initiation protocol) provides the VCC calling indication message in the message; MGCF carries this VCC calling indication message in the IAM of ISUP message, MSC judges that according to this VCC calling indication message called CS audio call is that VCC calls out, and notifies Access Network then.
In the 2G/3G system, the message flow of Iu pattern is as shown in Figure 8, specifically may further comprise the steps:
Step S801, S-CSCF judge that called CS audio call is anchored on the VCC AS, and the VCC calling indication message is set, and in the SIP INVITE, carry this VCC calling indication message, then this SIPINVITE message are sent to MGCF.
Step S802, MGCF calls out determination information according to the VCC that the SIP INVITE is provided with in the ISUP IAM message, and this ISUP IAM message is sent to MSC.
Step S803, MSC receive ISUP IAM message, send Setup message to UE.
Step S804; MSC is according to the ISUP IAM message that receives among the step S802; Set up message at service bearer, for example: it is that VCC calls out that this called CS audio call of VCC calling indication message indication is set in the RAB allocation request message, and sends it to the RNC/BSC of Access Network.
Step S805, the RNC/BSC of Access Network preserves this information and sends the RAB assignment response message and reply.
In the 2G/3G system, the message flow of A/Gb pattern is as shown in Figure 9, specifically may further comprise the steps:
Step S901, S-CSCF judge that called CS audio call is anchored on the VCC AS, and the VCC calling indication message is set, and in the SIP INVITE, carry this VCC calling indication message, then this SIPINVITE message are sent to MGCF.
Step S902, MGCF calls out determination information according to the VCC that the SIP INVITE is provided with in the ISUP IAM message, and this ISUP IAM message is sent to MSC.
Step S903, MSC receive ISUP IAM message, send Setup message to UE.
Step S904; MSC is according to the ISUP IAM message that receives among the step S902; Set up message at service bearer, for example: it is that VCC calls out that this called CS audio call of VCC calling indication message indication is set in the dynamic channel allocation message, and sends it to the RNC/BSC of Access Network.
Step S905, the RNC/BSC of Access Network preserves this information, and transmission has assigned acknowledgement messaging.
UE obtains the whether method of grappling of called CS audio call; Require UE after receiving called Setup message; Through USSD (Unstructured Supplementary Service Data; Unstructured supplementary service data) mutual with ICCF (IMS CS Control Function, IMS CS controlled function body), obtain this called CS audio call and whether anchor to VCC AS.In replying the service bearer assignment messages of Access Network, carry the VCC calling indication message, send to Access Network.
Wherein, the message flow of 2G system is shown in figure 10, specifically may further comprise the steps:
Step S1001, MSC send Setup message to UE.
Step S1002, UE and ICCF obtain VCC alternately and call out determination information.
Step S1003, the BSC of Access Network sends assignment command message and sets up service bearer to UE.
Step S1004; UE calls out determination information according to the VCC that obtains among the step S1002 and judges that this called CS audio call is that VCC calls out; At response message; For example: having assigned and having carried this called CS audio call of VCC calling indication message indication in the message is that VCC calls out, and this response message is sent to the BSC of Access Network.
Wherein, the message flow of 3G system is shown in figure 11, specifically may further comprise the steps:
Step S1101, MSC send Setup message to UE.
Step S1102, UE and ICCF obtain VCC alternately and call out determination information.
Step S1103, the RNC of Access Network sends radio bearer reconfiguration message and sets up service bearer to UE.
Step S1104; UE judges that according to the information of obtaining among the step S1102 this called CS audio call is that VCC calls out; At response message; For example: radio bearer is reshuffled and carried this called CS audio call of VCC calling indication message indication in the completion message is that VCC calls out, and this response message is sent to the BSC of Access Network.
The embodiment of the invention four provides whether this audio call of provenance access network entity indicating target access network entity is the method that VCC calls out, and according to embodiment one～three, sets up in the process and can the VCC calling indication message be sent to Access Network at audio call.But; In the audio call process, owing to reasons such as the mobility of UE and load balancing, the switching between the inner or wireless access system of wireless access system possibly take place in UE; Can carry out in order to make the VCC process; Guarantee the continuity of audio call, the source access network entity should be carried the VCC calling indication message in switching message, and this audio call of notification target access network entity is that VCC calls out.Below with the CS audio call in 2G CS network between MSC the handoff procedure of (inter-MSC) be that example describes, this switching flow is shown in figure 12, specifically may further comprise the steps:
Step S1201, the UE reporting measurement reports, the territory handover operation is carried out in the BSC/RNC decision of source Access Network.
Step S1202; The BSC/RNC of source Access Network sends and switches message (Handover required) MSC that Access Network connects to the source; Wherein at Old BSS to New BSS information IE (InformationElement; Cell) increase the VCC calling indication message in, indicating this audio call is that VCC calls out.This IE is in a Container, and is transparent to core network entity.
The pre-switch solicited message that step S1203, the MSC that the source Access Network connects will comprise the VCC calling indication message sends to the MSC that target access network connects.
Step S1204; The MSC that target access network connects sends to the Container of step S1202 the BSC/RNC of target access network; Analyze Old BSS to New BSS information IE by it; Preserve VCC calling indication message wherein, and maybe be with it as judging the foundation of whether carrying out the conversion of VCC territory.
When switching between the CS audio call different Access Networks that same MSC connects in 2G CS network; The BSC/RNC of source Access Network will switch message and send to the MSC that the source Access Network connects, and the MSC that is connected by the source Access Network then will switch the BSC/RNC that message sends to target access network.
When the PS audio call switches between different Access Networks; If the source Access Network is connected same core network entity SGSN/MME with target access network; Then the BSC/RNC/eNB of source Access Network will switch the SGSN/MME that message sends to source Access Network connection; This switching message is carried the VCC calling indication message that the source Access Network has been preserved, and the SGSN/MME of source Access Network connection will switch the BSC/RNC/eNB that message sends to target access network then.
If the source Access Network is connected different core network entity SGSN/MME with target access network; Then the BSC/RNC/eNB of source Access Network will switch the SGSN/MME that message sends to source Access Network connection; This switching message is carried the VCC calling indication message that the source Access Network has been preserved; The SGSN/MME of source Access Network connection will switch the SGSN/MME that message sends to the target access network connection then, and the SGSN/MME that target access network connects will switch the BSC/RNC/eNB that message sends to target access network again.
Above-mentioned VCC call indicating method; In the audio call process; When owing to reasons such as the mobility of UE and load balancing, when the switching between the inner or wireless access system of wireless access system took place UE, the source Access Network sent to the purpose Access Network with the VCC calling indication message; With this audio call of notification target Access Network is that VCC calls out, thereby has guaranteed the realization of SRVCC technology in follow-up handoff procedure.
Shown in figure 13, the structure chart of the decision-making system of calling out for embodiment of the invention VCC comprises: core network entity 1; Be used to obtain VCC and call out determination information; And call out determination information according to VCC and judge whether a calling is that VCC calls out, if then send the VCC calling indication message.Access network entity 2 is connected with core network entity 1, is used to receive the VCC calling indication message that core network entity 1 sends.
Wherein, The decision-making system that this VCC calls out also comprises: user equipment (UE) 3, be connected with access network entity 2, and be used for when calling out to called CS audio call; Obtain VCC and call out determination information; And call out determination information according to VCC and judge whether this called CS audio call is that VCC calls out, if then send the VCC calling indication message to access network entity 2.
Wherein, core network entity 1 comprises: information acquisition module 11 is used to obtain VCC and calls out determination information;
Sending module 13 is connected with determination module 12, is used for judging that at determination module 12 calling out is after VCC calls out, and sends the VCC calling indication message to access network entity 2.
Wherein, access network entity 2 comprises: indication information receiver module 21 is used to receive the VCC calling indication message that core network entity 1 sends.
Wherein, UE3 comprises: called party information acquisition module 31 is used for when calling out to called CS audio call, obtaining VCC and calling out determination information;
Called determination module 32 is connected with called party information acquisition module 31, and the VCC that is used for obtaining according to called party information acquisition module 31 calls out determination information and judges whether this called CS audio call is that VCC calls out;
Called indication sending module 33 is connected with called determination module 32, is used for judging that at called determination module 32 called CS audio call is after VCC calls out, and sends the VCC calling indication message to access network entity 2.
The decision-making system that above-mentioned VCC calls out; Under different voice call bearer situation; Call out determination information according to the VCC that obtains, core network entity 1 or UE3 judge that whether a calling is that VCC calls out, and notify access network entity 2 with result of determination; Thereby making access network entity 2 can control UE carries out and the relevant measurement of VCC territory conversion; And in follow-up handoff procedure, the VCC calling indication message is sent to target access network, make follow-up VCC territory conversion to carry out, thereby guarantee the continuity of audio call between IMS carrying and the carrying of CS territory.
Through the description of above execution mode, those skilled in the art can be well understood to the present invention and can realize by the mode that software adds essential general hardware platform, can certainly pass through hardware, but the former is better execution mode under a lot of situation.Based on such understanding; The part that technical scheme of the present invention contributes to prior art in essence in other words can be come out with the embodied of software product; This computer software product is stored in the storage medium; Comprise some instructions with so that computer equipment (can be personal computer, server, the perhaps network equipment etc.) carry out the described method of each embodiment of the present invention.
More than disclosedly be merely several specific embodiment of the present invention, still, the present invention is not limited thereto, any those skilled in the art can think variation all should fall into protection scope of the present invention.
Claims (17)
1. the decision method that continuous voice call technology VCC calls out is characterized in that, comprising:
Core network entity obtains VCC and calls out determination information;
Call out determination information according to said VCC and judge that whether a calling is that VCC calls out, and specifically comprises:
If said calling is an IP multimedia service subsystem, IMS audio call; When caller or called IMS audio call user are the VCC contracted user; Said IMS audio call anchors to the VCC application server, and then said core network entity judges that said IMS audio call is that VCC calls out;
If said calling is a caller circuit domain business CS audio call; Said core network entity is used enhancing logical CAMEL transmission CAMEL Initial Detection Point message to the mobile network of customization; If said caller CS audio call can anchor to the VCC application server, then said core network entity judges that according to the ability information of user equipment (UE) said caller CS audio call is that VCC calls out;
If said calling is called CS audio call, said core network entity confirms that said CS audio call anchors to the VCC application server, judges that then said called CS audio call is that VCC calls out;
If then send the VCC calling indication message to access network entity.
2. the decision method called out of VCC according to claim 1 is characterized in that after said access network entity is sent the VCC calling indication message, also comprise: said access network entity is preserved said VCC calling indication message.
3. the decision method called out of VCC according to claim 1; It is characterized in that; When said calling is the IMS audio call, said VCC calls out determination information and comprises at least: a kind of in service quality QoS parameter, user's the CAMEL-Subscription-Information and the ability information of user equipment (UE).
4. the decision method of calling out like the said VCC of claim 3; It is characterized in that; The said VCC of obtaining calls out determination information and specifically comprises: core network entity receives the activation auxiliary packet data protocol Secondary PDP Context request message that said UE sends, to obtain said qos parameter.
5. the decision method of calling out like the said VCC of claim 3 is characterized in that, the said VCC of obtaining calls out determination information and specifically comprises: core network entity obtains said user's CAMEL-Subscription-Information through home subscriber server HSS or attaching position register HLR.
6. the decision method of calling out like the said VCC of claim 3; It is characterized in that; The said VCC of obtaining calls out determination information and specifically comprises: core network entity receives the information that said UE reports in attaching process or route district/tracing section updating process, to obtain the ability information of said UE.
7. the decision method of calling out like the said VCC of claim 3; It is characterized in that; Saidly send the VCC calling indication message to access network entity and specifically comprise: said core network entity sends the RAB allocation request message or the base station sub-system packet flow context is created request message to said access network entity, and said RAB allocation request message or base station sub-system packet flow context are created request message and carried said VCC calling indication message.
8. the decision method called out of VCC according to claim 1 is characterized in that, when said calling is the CS audio call, said VCC calls out the ability information that determination information comprises UE at least.
9. the decision method of calling out like the said VCC of claim 8 is characterized in that, the said VCC of obtaining calls out determination information and specifically comprises: core network entity receives said UE and adhering to/and the information that reports in the location area updating process, to obtain the ability information of said UE.
10. the decision method called out of VCC according to claim 1 is characterized in that, when said calling is called CS audio call,
The said VCC of obtaining calls out determination information and comprises: core network entity is called out determination information through obtaining said VCC alternately with the CAMEL service entities.
11. the decision method called out of VCC is characterized in that according to claim 1, when said calling is called CS audio call,
The said VCC of obtaining calls out determination information and comprises: the ISDN user face initial address message ISUP IAM message that core network entity receiving media gateway control function body MGCF sends, call out determination information to obtain said VCC.
12. the decision method as the said VCC of claim 11 calls out is characterized in that, the ISUP IAM message that said reception MGCF sends specifically comprises:
Service call conversation control function body S-CSCF judges that said called CS audio call is that VCC calls out, and sends session initiation protocol SIP INVITE to said MGCF, and said SIP INVITE carries the VCC calling indication message;
Said MGCF calls out determination information according to the VCC that said SIP INVITE is provided with in the said ISUP IAM message, and said ISUP IAM message is sent to said core network entity.
13. decision method like claim 8 or 10 said VCC callings; It is characterized in that; Saidly send the VCC calling indication message to access network entity and comprise: said core network entity sends service bearer to said access network entity and sets up message, and said service bearer is set up message and carried said VCC calling indication message.
14. the decision method called out of VCC is characterized in that according to claim 1, when said calling is called CS audio call,
The said VCC of obtaining calls out determination information and comprises: UE and IMS CS controlled function body ICCF obtain said VCC alternately and call out determination information.
15. decision method like the said VCC calling of claim 14; It is characterized in that; Saidly send the VCC calling indication message to access network entity and comprise: said UE sends to said access network entity and has assigned message or radio bearer is reshuffled completion message, and said message or the radio bearer of having assigned reshuffled and accomplished message and carry said VCC calling indication message.
16. the decision-making system that VCC calls out is characterized in that, comprising:
Core network entity is used to obtain VCC and calls out determination information, and calls out determination information according to said VCC and judge that whether a calling is that VCC calls out, and specifically comprises:
If said calling is an IP multimedia service subsystem, IMS audio call; When caller or called IMS audio call user are the VCC contracted user; Said IMS audio call anchors to the VCC application server, and then said core network entity judges that said IMS audio call is that VCC calls out;
If said calling is a caller circuit domain business CS audio call; Said core network entity is used enhancing logical CAMEL transmission CAMEL Initial Detection Point message to the mobile network of customization; If said caller CS audio call can anchor to the VCC application server, then said core network entity judges that according to the ability information of user equipment (UE) said caller CS audio call is that VCC calls out;
If said calling is called CS audio call, said core network entity confirms that said CS audio call anchors to the VCC application server, judges that then said called CS audio call is that VCC calls out;
If then send the VCC calling indication message;
Access network entity is connected with said core network entity, is used to receive the VCC calling indication message that said core network entity sends.
17. a core network entity is characterized in that, comprising:
The information acquisition module is used to obtain VCC and calls out determination information;
Determination module is connected with said information acquisition module, and the VCC that is used for obtaining according to said information acquisition module calls out determination information and judges that whether a calling is that VCC calls out, and specifically comprises:
If said calling is an IP multimedia service subsystem, IMS audio call; When caller or called IMS audio call user are the VCC contracted user; Said IMS audio call anchors to the VCC application server, and then said core network entity judges that said IMS audio call is that VCC calls out;
If said calling is a caller circuit domain business CS audio call; Said core network entity is used enhancing logical CAMEL transmission CAMEL Initial Detection Point message to the mobile network of customization; If said caller CS audio call can anchor to the VCC application server, then said core network entity judges that according to the ability information of user equipment (UE) said caller CS audio call is that VCC calls out;
If said calling is called CS audio call, said core network entity confirms that said CS audio call anchors to the VCC application server, judges that then said called CS audio call is that VCC calls out;
Sending module is connected with said determination module, is used for judging that at said determination module said calling is after VCC calls out, to send the VCC calling indication message to access network entity.
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| US9392626B2 (en) * | 2009-11-09 | 2016-07-12 | Samsung Electronics Co., Ltd. | Method and system to support single radio video call continuity during handover |
| CN102104848B (en) * | 2009-12-16 | 2014-08-06 | 中国移动通信集团公司 | Dual-mode single-standby voice service continuity realization method and Internet protocol (IP) multimedia subsystem |
| ES2848111T3 (en) * | 2011-10-04 | 2021-08-05 | Ericsson Telefon Ab L M | Device to select voice over LTE or CS backtracking for voice sessions |
| EP3454590B1 (en) * | 2016-06-03 | 2021-09-15 | Huawei Technologies Co., Ltd. | Quality parameter reporting manner |
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