CN101978727A - Method, device and system for srvcc switching and its data transmission - Google Patents
Method, device and system for srvcc switching and its data transmission Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
- H04W36/0022—Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies
- H04W36/00224—Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies between packet switched [PS] and circuit switched [CS] network technologies, e.g. circuit switched fallback [CSFB]
- H04W36/00226—Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies between packet switched [PS] and circuit switched [CS] network technologies, e.g. circuit switched fallback [CSFB] wherein the core network technologies comprise IP multimedia system [IMS], e.g. single radio voice call continuity [SRVCC]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0055—Transmission or use of information for re-establishing the radio link
- H04W36/0066—Transmission or use of information for re-establishing the radio link of control information between different types of networks in order to establish a new radio link in the target network
Abstract
A method, a device and a system for SRVCC switching and its data transmission are provided by the embodiments of the invention. A method for SRVCC switching includes: when a terminal implements the wireless link switching from a second network to a first network, a source mobile switching center server / media gateway in the first network establishes a bearing with a serving gateway / packet data gateway in the second network; during the wireless link switching procedure, the source mobile switching center server / media gateway initiates the domain switching procedure in the SRVCC switching based on the obtained information that the terminal has switched to the first network; among others, before the domain switching completes, the source mobile switching center server / media gateway in the first network transmits the voice service data from the terminal to the serving gateway / packet data gateway through the bearing. The interruption of service due to the domain switching procedure could be reduced by means of the mode for forwarding voice service data, thus reducing the whole time of the interruption of service in the whole SRVCC switching procedure.
Description
SRVCC switchings and its methods, devices and systems technical field of data transfer
The present invention relates to the methods, devices and systems of communication technical field, more particularly to SRVCC switchings and its data transfer.Background technology
At present, third generation cooperative partner program（3GPP) normal structure is proposed evolution network framework (the System Architecture Evolution/Long Term Evolved of a new generation；Hereinafter referred to as：), SAE/LTE its core network part is System Architecture Evolution（SAE) network, access mesh portions are Long Term Evolution（LTE) network.Access mesh portions in gradual network system are the UMTS land radio access web for referring to evolution（ Evolved UMTS Territorial Radio Access Network;Hereinafter referred to as：), EUTRAN it is made up of enode (eNB).The core network part of gradual network system is by mobile management entity（ Mobility Management Entity;Hereinafter referred to as：) and System Architecture Evolution MME（ System Achitechture Evolution:Hereinafter referred to as：SAE) gateway（SAE Gateway) two parts composition, SAE gateways include gateway（ Serving Gateway;Hereinafter referred to as：) and grouped data network gateway SGW（ PDN Gateway;Hereinafter referred to as： PGW ).Wherein, MME is the control plane node of the core network part of gradual network system, is responsible for the mobile management of chain of command, includes the management and mobile status management of user's context and user plane carrying, distributing user temporary identifications etc.；SGW is the user plane anchor point between different access networks in 3GPP, the interface of different access networks inside shielding 3GPP, and PGW is the user plane anchor point between 3GPP access networks and non-3GPP access network, and external packet data networks（ Packet Data Network;Hereinafter referred to as：PDN interface)."Policy and Charging Rules Function entity（Policy and Charging Rule Function;Hereinafter referred to as：PCRF) it is used for policy control decision and flow based charging control function.Home network server（Home Subscriber Server ；Hereinafter referred to as：HSS) it is used for storing user subscription information.
In the second generation (2G, i.e. GERAN and core net）/ the third generation (3G, i.e. UTRAN and core
Net）In network, speech business is typically all to be carried on circuit switching（Circuit Switch;Hereinafter referred to as：CS) on domain, data service is typically carried at packet switch（Packet Switched;Hereinafter referred to as：PS) on domain；And the packet switching system that S AE/ LTE networks are carried as a kind of pure ps domain, its core network part is not present and the mobile switching centre in 2G/3G systems（MSC) corresponding network element, speech business can only be transmitted in the carrying of its ps domain, and by IP multimedia core network subsystems（ IP Multimedia Core Network Subsystem;Hereinafter referred to as：IMS) speech business is controlled by the network carried based on IP.Thus a new problem is introduced, i.e., how to ensure the problem of seamless between evolution system and traditional 3G or 2G systems of speech business continues, especially terminal synchronization only supports a kind of transmitting-receiving of wireless access technology（ single radio;When referred to as " list radio "), single-receiver voice is continuous（ Single Radio Voice Call Continuity;Hereinafter referred to as：SRVCC the problem of) problem turns into the urgent need to address.
Due to EUTRAN network designs initial stages, city and focus may be only limited, so there is the stage for runing E-UTRAN and existing GERAN/UTRAN networks simultaneously.There is the mixed deployment of different access technologies wireless network, be necessarily required to support the switching between different radio access network, i.e. switching between EUTRAN and GERAN/UTRAN networks.For example, the strategy of operator is user's prioritizing selection EUTRAN network services, but if being moved to the place that EUTRAN networks are not covered with, user is accomplished by being switched to traditional 2G/3G networks.In another example, due to loading problem, when EUTRAN network loads are overweight, the strategy of operator can also be from EUTRAN network switchings to traditional 2G/3G networks by user.In order to ensure the service quality of speech business, operator's an urgent demand can support speech business to be switched to traditional 2G/3G networks from EUTRAN.In the solution for the SRVCC that prior art is proposed, the SRVCC actual voice continuity including IMS domain of handoff procedure（ Voice Call Continuity;Hereinafter referred to as：VCC) domain conversion and EUTRAN switch two processes to GERAN/UTRAN Radio Link.EUTRAN switches to GERAN/UTRAN SRVCC, and MME is firstly received the SRVCC handover requests such as " HO required " sended over from EUTRAN, if MME has the SRVCC session translation number information of this terminal（ Session transfer number for SRVCC;Hereinafter referred to as：), STN-SR will be by " Sv interfaces " to the mobile switching centre of evolution（Mobile
Switching Center;Hereinafter referred to as：MSC SRVCC switching flows) are triggered, it is to start VCC domains flow path switch that the MSC of evolution initiates session transmissions flow to IMS, and coordinates Radio Link switching flow i.e. " PS to CS switchings " flow to Target cell；Then the MSC of evolution sends packet-circuit handoff response to MME, and the response message includes the relevant information of necessary circuit switching command, to realize access from terminal to target GERAN/UTRAN cells and switching.
In the prior art, due in SRVCC handoff procedures are performed, the switching of the Radio Links such as palpus and the conversion of VCC domains are completed, user speech business could be recovered, and cause to perform the time delay that the total interruption time delay of SRVCC switchings switches considerably beyond speech business in execution to GERAN/UTRAN Radio Links from EUTRAN to GERAN/UTRAN（Such as 200 ~ 300ms), generally several seconds；Further, if prior art switching terminal occurs to GERAN/UTRAN Radio Link handoff failures after the conversion of VCC domains is completed, the terminal return after former network can not receiving and transmitting voice business datum again, cause call drop.The content of the invention
The embodiments of the invention provide SRVCC switchings and its methods, devices and systems of data transfer.A kind of method of SRVCC switchings, including：
In terminal from the Radio Link handoff procedure of the second network to first network, source Mobile Switching Center Server/WMG in the first network sets up the carrying with gateway/packet data gateway in second network；Source Mobile Switching Center Server/the WMG is switched to the information of the first network according to the terminal known, starts the domain transfer process in SRVCC switchings；Wherein, before the domain transfer process is completed, the Voice traffic data in the carrying transmission SRVCC switchings.
A kind of method of data transfer in SRVCC switchings, including：
Terminal is during SRVCC switchings are carried out, and gateway/packet data gateway in the second network sets up the carrying with source Mobile Switching Center Server/WMG in first network；Wherein, before the domain transfer process in the SRVCC handoff procedures is completed, the carrying transmission SRVCC is cut
Voice traffic data during changing.
A kind of method of data transfer in SRVCC switchings, including：
In terminal from the Radio Link handoff procedure of the second network to first network, source mobile management entity sends the parameter comprising foundation carrying to source Mobile Switching Center Server/WMG in the first network；Wherein, the parameter includes the address information of gateway/packet data gateway in second network, source Mobile Switching Center Server/the WMG sets up the carrying with the gateway/packet data gateway according to the parameter, and domain transfer process of the source Mobile Switching Center Server/WMG in SRVCC switching flows uses the Voice traffic data of the carrying transmission terminal before completing.
A kind of method of SRVCC switchings, including：
In Radio Link handoff procedure, the circuit connection set up between target Mobile Switching Center Server/WMG in source WMG and the first network in first network；Source Mobile Switching Center Server in the first network starts the domain transfer process in SRVCC switchings；Wherein, the domain transfer process being electrically connected in SRVCC switchings transmits the Voice traffic data in the SRVCC handoff procedures before completing, pass through the source WMG when between Voice traffic data grouped data network gateway in the second network and gateway.
A kind of WMG, in first network, including：
First processing module, for terminal set up from the Radio Link handoff procedure of the second network to first network and the second network in gateway/packet data gateway carrying；Second processing module, the information for being switched to the first network according to the terminal known in the Radio Link handoff procedure starts the domain transfer process in SRVCC switchings；3rd processing module, for transmitting the Voice traffic data from the terminal in the carrying that the first processing module is set up to the gateway/packet data gateway before the domain transfer process that the Second processing module starts is completed.
A kind of gateway, in the second network, including：
5th processing module, during carrying out SRVCC switchings in terminal, sets up the carrying with source Mobile Switching Center Server/WMG in the first network；6th processing module, for
Domain transfer process during the SRVCC switchings transmits the Voice traffic data for being sent to the terminal to the source Mobile Switching Center Server/WMG in the carrying that the 5th processing module is set up before completing.
A kind of WMG, including：
8th processing module, in Radio Link handoff procedure, the circuit between target Mobile Switching Center Server/WMG in foundation and first network to be connected；9th processing module, domain transfer process in for switching in SRVCC transmit the SRVCC handoff procedures in the circuit connection that the 8th processing module is set up before completing in Voice traffic data, pass through the WMG when between Voice traffic data grouped data network gateway in the second network and gateway.
A kind of mobile management entity, including：
Transmitting element, for from the Radio Link handoff procedure of the second network to first network, sending the information of the parameter comprising foundation carrying and/or voice coding list in terminal to source Mobile Switching Center Server/WMG in the first network；Wherein, the parameter includes the address information of gateway/packet data gateway in second network, source Mobile Switching Center Server/the WMG sets up the carrying with the gateway/packet data gateway according to the parameter, and domain transfer process of the source Mobile Switching Center Server/WMG in SRVCC switching flows uses the Voice traffic data of the carrying transmission from the terminal to the gateway/packet data gateway before completing.
A kind of network system, including：Any of the above-described kind of WMG and any of the above-described kind of gateway.A kind of network system, including：Any of the above-described kind of WMG.
SRVCC switchings provided in an embodiment of the present invention and its methods, devices and systems of data transfer, before the domain in completing SRVCC switchings is converted, by transmitting Voice traffic data in the carrying of the source WMG and gateway/packet data gateway of foundation or in the circuit connection of source WMG and target Mobile Switching Center Server/WMG, it can reduce by performing the speech business break period that VCC domains flow path switch is brought, reduce the total business interruption time of whole SRVCC handoff procedures.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, the required accompanying drawing used in embodiment or description of the prior art will be briefly described below, apparently, drawings in the following description are only some embodiments of the present invention, for those of ordinary skill in the art, without having to pay creative labor, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is the flow chart of embodiment of the method one that SRVCC of the present invention switches；
The network system composition schematic diagram of SRVCC switchings is realized in the embodiment of the method one that Fig. 2 switches for application SRVCC of the present invention；
Fig. 3 is the flow chart of embodiment of the method two that SRVCC of the present invention switches；
Fig. 4 is deleting bearing signaling diagram in the embodiment of the method two of data transfer in SRVCC handoff procedures of the present invention；
Fig. 5 is the flow chart of embodiment of the method three that SRVCC of the present invention switches；
Fig. 6 is the flow chart of embodiment of the method four that SRVCC of the present invention switches；Network system composition schematic diagram；
Fig. 8 is the flow chart of embodiment of the method five that SRVCC of the present invention switches；
Fig. 9 is deleting bearing signaling diagram in the embodiment of the method five of data transfer in handoff procedure of the present invention；Figure 10 is the structural representation of media gateway embodiment one of the present invention；
Figure 11 a are the structural representation of gateway embodiment one of the present invention；
It is the structural representation of mobile management entity embodiment one of the present invention to scheme l ib；
Figure 12 is the structural representation of inventive network system embodiment one；
Figure 13 is the structural representation of media gateway embodiment two of the present invention；
Figure 14 is the structural representation of inventive network system embodiment two.Embodiment
The technical scheme of the embodiment of the present invention is further illustrated with specific embodiment below in conjunction with the accompanying drawings.
Due to the existing phenomenon that there is EUTRAN networks and the deployment of GERAN/UTRAN mixture of networks, in order to prevent speech business from interrupting, it is necessary to support speech business can be in the switching between EUTRAN and GERAN/UTRAN networks.When the startup of one of two processes is changed in Radio Link switching or VCC domains in the prior art, the speech business of user begins to interrupt, hereafter it is completed in Radio Link switching and the conversion of VCC domains, user speech business could be recovered, so as to cause the defect extended during the service disconnection of SRVCC switchings.The embodiments of the invention provide a solution：Set up source WMG (the Media Gateway of SGW/PGW and the GERAN/UTRAN network of EUTRAN networks;Hereinafter referred to as：MGW the carrying between), and before VCC domains transfer process is completed, by the carrying between SGW/PGW and MGW to target GERAN/UTRAN forwarded Voice traffic datas, the Voice traffic data forwarded includes the bi-directional data of the uplink and downlink of user speech business in the SRVCC handoff procedures；It can so reduce by performing the speech business break period that VCC domains flow path switch is brought.For illustrative ease, the speech business for carrying out SRVCC switchings is referred to as SRVCC business in various embodiments of the present invention.
Fig. 1 is the flow chart of embodiment of the method one of SRVCC switchings in the embodiment of the present invention, and the method switched for the ease of SRVCC in the description embodiment of the present invention carries out citing description using the network system composition schematic diagram in Fig. 2.But, it will appreciated by the skilled person that the equipment that includes of Fig. 2 network systems is only for convenience of description used in present invention method, being not offered as the system that the present invention provides necessarily includes its all equipment, as depicted in figs. 1 and 2, this method includes：
100, the carrying set up between gateway/packet data gateway in the Mobile Switching Center Server of the source in first network/WMG and the second network.
101, in Radio Link handoff procedure, source Mobile Switching Center Server/WMG is switched to the information of first network according to the terminal known, start the domain transfer process in SRVCC switchings, wherein, before the domain transfer process is completed, the Voice traffic data in the carrying transmission SRVCC switchings.
As shown in Fig. 2 line 1 represents the carrying path before Radio Link switching, line 2 represents the carrying path after the conversion of VCC domains, and line 3 represents the SIP signaling paths before Radio Link switching, the table of line 4
Show the carrying path before the conversion of VCC domains in the embodiment of the present invention.The second network described in the present embodiment can be evolvement network such as EUTRAN networks and its core net, abbreviation EUTRAN, first network can be legacy network such as GERAN/UTRAN networks and its core net, abbreviation GERAN/UTRAN, in order to which the ^ of the side of description 1 is shown in, by source Mobile Switching Center Server（MSC Server)/MGW incorporates first network into, actually, this equipment is the gateway node for connecting GERAN/UTRAN networks and EUTRAN networks, the SRVCC to be carried out switchings are from EUTRAN is switched to GERAN/UTRAN, because Voice traffic data is carried in EUTRAN by PS, carried in GERAN/UTRAN by CS, therefore further SRVCC switchings are to carry SRVCC business datums from being switched in GERAN/UTRAN CS by PS carryings in EUTRAN.Switch total time delay to reduce SRVCC, the present embodiment is before VCC domain conversions are carried out, the source MGW and SGW or PGW in EUTRAN in GERAN/UTRAN is (for simplicity, hereinafter referred to as SGW/PGW) between set up carrying, the IMS that is carried on of the foundation is completed to be responsible between first network and the second network transmitting SRVCC business datums before the conversion of VCC domains, and IMS is communicated to connect with source MSC Server/MGW and SGW/PGW.The SGW being located in EUTRAN and PGW being related in the present embodiment refer to the unification or logically independent of both logics, physically or logically relevant, can be physically separate device can also be physics one equipment.Source MSC Server and MGW in GERAN/UTRAN refer to the unification or logically independent of both logics, physically or logically relevant, can be physically separate device can also be physics one equipment.
It should be noted that source MSC Server/MGW represent MSC Server and/or MGW, wherein MGW is responsible for handling user service data, and only with MSC Server interactive controlling signalings；MSC Server be responsible for handle control signaling, including with other entity interaction control signalings and with MGW interactive controlling signalings, by controlling processing of the MGW to user service data with MGW interactive controllings signaling.For example, source MME sends SRVCC handover requests and gives MSC Server/MGW, MSC Server receive the control signaling, and parameter and the MGW interactive controllings of the foundation carrying in the control signaling set up carrying and to the processing of user service data, send the control message that includes setting up the parameter carried to
MGW, MGW, which performs feedback after corresponding operating, to be included giving MSC Server for the response message of the parameter of carrying distribution, and MSC Server feed back to the MSC Server parameter for newly-built carrying distribution in the SRVCC switching request responses for return to source MME comprising MGW afterwards.
As shown in Fig. 2 in order to which SRVCC business to be switched to and realized by line 2 from being realized by line 1 in the present embodiment, should during include Radio Link switching（That is HO switches）With the conversion of VCC domains（That is DT is changed) two processes, when carrying out HO switchings, by setting up the carrying between source MGW and SGW/SGW, allow progress on Deta bearer online 4, for example after carrying is successfully established, service centrality and application server for continuity (Service Centralization and Continuity Application Server；Hereinafter referred to as：SCC AS) control SRVCC business datums by SGW/PGW when, the SRVCC business datums can be sent to source MGW by SGW/PGW by the carrying, then be sent to GERAN/UTRAN by source MGW, complete Radio Link switching.
During above-mentioned Radio Link switches, source MSC Server/MGW have also set up a circuit with target MSC Server/MGW and have been connected, after source MSC Server/MGW and target MSC Server/MGW set up completion carrying, the carrying is connected by source MSC Server/MGW with the circuit to be associated, so that after the Voice traffic data for needing to carry out corresponding to the mobile terminal of SRVCC switchings is streamed in the carrying, target MSC Server/MGW can be given by the circuit linkup transmit, data flow is then sent to by mobile terminal by target MSC Server/MGW, realize the forwarding of data.Wherein carry associated with circuit connection, the interrelated of the two can be realized for example, by binding the mark and the mark of carrying of circuit connection, can also be realized, can also be not limited thereto otherwise by setting up mapping table.
Establishing the carrying between source MGW and SGW/PGW, or be further able to send after SRVCC business datums to GERAN/UTRAN by the carrying of foundation, start to start session flow path switch, that is IMS domain flow path switch, source MSC Server/MGW indicate message to the conversion of IMS sending domain, domain conversion indicates that message can be initialization session transmissions message, carries the session transmissions number of SRVCC business (hereinafter referred to as：), STN-SR can also be with session initiation protocol (Session Initiated Protocol;Hereinafter referred to as：SIP) " Invite " message of signaling indicates message as domain conversion.
It should be noted that, source MSC Server/MGW indicate message to the conversion of IMS sending domain, can be that the specific control message trigger source MSC Server that other entities that source MSC Server are received are sent indicate message to the conversion of IMS sending domain, when the triggering moment can be that for example carrying is successfully established, when can also be that mobile terminal is successfully accessed to first network, can also be that source MGW receives after particular traffic data notice source MSC Server, trigger source MSC Server and indicates message to the conversion of IMS sending domain.
Carrying between MGW and SGW/PGW is used for the mode of transmitting voice service data, it is possible to reduce the service disconnection produced by the flow path switch of VCC domains, reduces the total business interruption time of whole SRVCC handoff procedures；And if link switching failure of eating dishes without rice or wine, VCC domains flow path switch can be cancelled, it is to avoid service fail.
Following illustrate can be included but is not limited to by setting up the mode of carrying in above-described embodiment between source MGW in GERAN/UTRAN and the SGW/PGW in EUTRAN.
The first situation, source MME sends SRVCC handover requests to source MSC Server/MGW, such as " PS to CS Req " message request carries out ps domain to the switching in CS domains, source MGW and SGW/PGW carrying is set up in request simultaneously for the SRVCC business, and it is that notice source MSC Server/MGW Radio Link handoff procedures have been turned on that source MME sends " PS to CS Req " message to source MSC Server/MGW.For the newly-built carrying, source MME can be by source MSC Server/MGW as target eNB, and similar execution, can also be by source MSC Server/MGW as target SGW, switching of the similar execution across SGW across eNB switching.Source MME includes across eNB switching according to different switching modes or switches in the relevant parameter for the carrying that the voice coding list i.e. voice coding list of terminal support is issued in the SRVCC handover requests and/or SRVCC business is carried out across SGW, such as " VOIP Bearer info ", include the QoS relevant parameters for the carrying for carrying out SRVCC business, and/or the SGW/PGW of business address such as IP and/or port information, and/or uplink tunnel Endpoint ID（Tunnel End Point Identifier ；Hereinafter referred to as：TEID) etc.；Source MSC Server/MGW are received after the SRVCC handover requests, and the parameter that across eNB switching or across SGW switching identification are received can be included according to different switching modes, and according to these parameters in the newly-built carryings of source MGW, including distribution resource
And for this 7 | carry distribution address such as IP and/or port information and/or descending TEID.And interacted with the functional entity in GERAN/UTRAN so that GERAN/UTRAN connects to set up the corresponding CS domains resource of the traffic assignments i.e. circuit.Afterwards, source MSC Server/MGW return to response message such as " PS to CS Resp " message of SRVCC handover requests to source MME, it is that the user terminal selected voice coding modes, the source MGW that use are newly-built the address such as IP and/or port information for carrying distribution to be included in target GERAN/UTRAN cells, and/or descending TEID.Afterwards, source MME sends bearer update request and notifies SGW/PGW to update the carrying of SRVCC business, such as " Update bearer " message, including the address such as IP and/or port information that source MGW distributes for newly-built carrying, and/or descending TEID information.SGW/PGW according to the relevant parameter received by the bearer update by SGW/PGW to source EUTRAN of the SRVCC business be SGW/PGW to source MGW carrying, so as to set up carrying between source MGW and SGW/PGW, this be carried on source MGW sides be according to source MGW the address such as IP and/or port information distributed and/or descending TEID information, be in SGW/PGW sides according to original SGW/PGW for the carrying built between EUTRAN when the address such as IP and/or port information that are distributed and/or up TEID information.Set up carrying and also relate to the carrying mark for carrying out the SRVCC business, such as " E-RAB id " or " EPS bearer id " can be carried in the message related to carrying, such as SRVCC handover requests " PS to CS req " message or bearer update request such as " Update bearer " message.SGW/PGW is established after the carrying with source MGW, feedback message gives source MME, such as " Update bearer response " message, now, carrying between SGW/PGW and EUTRAN access networks is replaced by the carrying between SGW/PGW and source MGW, and the carrying is that circuit is connected association with the GERAN/UTRAN CS domains resources reserved by source MGW, SRVCC business can be transmitted from SGW/PGW to source MGW in new carrying will institute's voice traffic data stream transmitting in the carrying, and GERAN/UTRAN networks are sent to by the circuit connection of association.During being somebody's turn to do, if using tunnel protocol between SGW/PGW and source MGW（ GPRS Tunneling Protocol GPRS；Hereinafter referred to as：GTP) bearing mode sends data, then the SRVCC handover requests also include the up TEID that SGW/PGW is the SRVCC traffic assignments, and it is the SRVCC industry that the response message of the SRVCC handover requests, which also includes source MGW,
Be engaged in the descending TEID distributed, and the bearer update request also includes the descending TEID.The carrying set up in the present embodiment can be translated after the SGW/PGW releases for receiving IMS transmissions are notified and put, i.e. after the conversion of VCC domains is completed, IMS can indicate the deleting load-bearing that SGW/PGW will be set up between the MGW of source, discharge the resource distributed for the link.Specifically include, SGW/PGW receives translating for IMS transmissions and put after notice, translate the data put the carrying and/or stop sending institute's voice traffic to source MSC Server/GW.Source MSC Server are received after the notification message of connection remote subscriber of IMS transmissions, notify MGW to translate the data put the carrying and/or stop sending institute's voice traffic to SGW/PGW.
It is all identical until receiving SRVCC switching request responses that second of situation, second of situation and the first situation send SRVCC handover requests in source MME.Afterwards, it is the SRVCC service bearer requests to create that source MME is sent to SGW/PGW, and indicate newly-built carrying and the association published originally of SGW/PGW to EUTRAN access networks, such as " Create CS bearer Request " message, including address such as IP and/or port information of the source MGW for newly-built carrying distribution, and/or descending TEID information.SGW/PGW is according to the carrying that the relevant parameter received is the newly-built SGW/PGW of the SRVCC business to source MGW, and it is the address distributed according to source MGW that this, which is carried on source MGW sides,（IP and/or PORT) and/or descending TEID information, it is the address according to original SGW/PGW to be distributed when building carrying between EUTRAN access networks in SGW/PGW sides（IP and/or port information) and/or up TEID information or newly assigned address（IP and/or port information) and/or up TEID information, and by newly-built carrying and bearing association between SGW/PGW and source EUTRAN access networks, it is identical address (IP and/or port information) and/or up TEID information that two such, which is carried on SGW/PGW sides, if carrying newly-built SGW/PGW is newly assigned with address（IP and/or port information）And/or up TEID information, then it is different addresses that two, which are carried on SGW/PGW sides,（IP and/or port information) and/or up TEID information.It is identical with the first situation, set up the carrying and also relate to the carrying mark carrying in the message related to carrying foundation for carrying out the SRVCC business.After SGW/PGW carryings are successfully established, feedback message gives source MME, such as " Create CS bearer response " message, now, there are two carryings between EUTRAN access networks and source MGW respectively from SGW/PGW for SRVCC business, and the newly-built carrying and the GERAN/UTRAN CS domains resources reserved are circuit by source MGW
Connection association, SRVCC business is transmitted to EUTRAN by the carrying between EUTRAN from SGW/PGW, can also transmitted by with source MGW in new carrying, and is sent to GERAN/UTRAN networks by the circuit connection of association.That is SGW/PGW can pass through the bi-casting flow that set up carrying and the carrying between EUTRAN before carry out data to SRVCC business in the present embodiment.It is that SRVCC business is successfully established carrying that source MME, which can also be notified further to source MSC Server/MGW,.If sending data using GTP bearing modes between SGW/PGW and source MGW, then the SRVCC handover requests also include the up TEID that SGW/PGW is the SRVCC traffic assignments, the response message of the SRVCC handover requests also includes the descending TEID that source MGW is the SRVCC traffic assignments, and the bearer update request also includes the descending TEID.The carrying set up in the present embodiment can be translated after the SGW/PGW releases for receiving IMS transmissions are notified and put, i.e. after the conversion of VCC domains is completed, IMS can indicate the deleting load-bearing that SGW/PGW will be set up between the MGW of source, translate the resource for bleeding off and being distributed for the carrying.Certainly, the carrying between SGW/PGW and EUTRAN access networks can also simultaneously be translated and put.Specifically include, SGW/PGW receives translating for IMS transmissions and put after notice, translate the data put the carrying and/or stop sending institute's voice traffic to source MSC Server/GW.Source MSC Server are received after the notification message of connection remote subscriber of IMS transmissions, are notified the MGW releases carrying and/or are stopped sending the data of institute's voice traffic to SGW/PGW.
In above-mentioned two situations, source MGW is during SRVCC business datums are transmitted, also need to carry out code conversion to upstream data or downlink data, that is the coded system that source MGW will be sent to target MSC Server/MGW downlink data is converted to the coded system that terminal is used in target GERAN/UTRAN, the coded system for the upstream data that source MGW sends terminal is converted to the coded system that the terminal is used in the EUTRAN of source, that is, the coded format for needing the speech data forwarded to SGW/PGW to use.For example, source MGW carries out code conversion according to carrying mark or descending TEID to the downlink data of the SRVCC business；Source MGW is connected the upstream data of identification terminal transmission according to the target MSC Server/MGW of association with source MGW circuit, and code conversion is carried out to the upstream data of the SRVCC business.
Fig. 3 is the flow chart of embodiment of the method two that SRVCC of the present invention switches, this method and above-mentioned first
The situation of kind is corresponding, as shown in figure 3, this method is specifically included：
La, UE send measurement report to EUTRAN.
2a, EUTRAN determine to be triggered to GERAN switching.
The present embodiment is illustrated by taking GERAN as an example.
3a, EUTRAN, which send switching, needs " Handover Required " message to give source MME.The message includes Target cell or Base Station Identification, source to target side transparent vessel（Source to Target Transparent Container), at the same EUTRAN base stations indicate source MME this to cut be SRVCC switching.
4a, switches according to EUTRAN SRVCC and indicates, grade of service marks of the source MME based on carrying（ Quality Class Identity;Referred to as：QCI) the voice bearer that identification is present, and voice bearer is separated.
5a, source MME sends SRVCC handover request message to source MSC Server/MGW, request carries out PS domains to the switching in CS domains, source MSC Server/MGW to SGW/PGW carrying is set up in request for the SRVCC business simultaneously, such as " PS to CS request " message, the voice " CODEC list " of SRVCC UE supports is wherein carried, in addition to make the relevant parameter " VOIP Bearer info " of the SRVCC voice bearer.
Tracing section updating (Tracking Area Update can be passed through by being somebody's turn to do " CODEC list ";Referred to as：TAU) flow or attachment (Attach) flow, report source MME, and be stored in source MME by terminal;Or eNB, by being inquired about to UE transmitting capacities, obtaining UE ability includes " CODEC list ", passes to source MME and is stored in source MME.
It is somebody's turn to do the QoS relevant parameters that " VOIP Bearer info " includes the carrying for carrying out SRVCC business, and/or the SGW/PGW of business address (such as IP and/or PORT), the identification information of carrying can also be included, such as " E-RAB id " or " EPS bearer id ".If SGW/PGW sends data using GTP bearing modes to source MGW, the up TEID that PGW/SGW is SRVCC traffic assignments is also included in SRVCC handover request message.
Source MSC Server/MGW are received after the SRVCC handover requests, are existed according to these parameters
The newly-built carryings of source MGW, including distribute resource and distribute address such as IP and/or port information and/or descending TEID for the carrying.
6a, source MSC Server/MGW send SRVCC handover requests such as " Prepare Handover Request " message to target MSC Server/MGW, perform across MSC switching flow, and reserve CS domains resource for the SRVCC business.
7a, interaction handover request and confirmation message between target MSC Server/MGW and target BSS, to perform resource allocation.
8a, target MSC Server/MGW send preparation handoff response " Prepare Handover Response " message and give source MSC Server/MGW.
9a, the circuit connection set up between target MSC Server/MGW and source MSC Server/MGW, the newly-built carrying of source MSC Server/MGW associations is connected with circuit.
The parameter feedback of carrying between newly-built target SGW/PGW and source MGW is given source MME by 10a, source MSC Server/MGW, i.e., the address distributed in the MSC Server/MGW of source for the carrying is notified in " PS to CS response " message（) and the parameter such as the voice coding modes that use of selected UE IP/PORT.
If SGW sends data using GTP bearing modes to MSC Server/MGW, needed in this comprising the descending TEID that source MSC Server/MGW are the SRVCC traffic assignments.
If source MSC Server/MGW are returned in source MME corresponding message, instruction can not be performed " PS to CS HO ", the SRVCC switchings that then source MME is performed by " HO required NACK " the message informing source EUTRAN users can not be performed, and can return to failure reason value.
1 la, source MME send access network equipment of switching command " Handover Command " message to E-UTRAN.
From EUTRAN switching commands " Handover from E-UTRAN Command ", message is to UE for 12a, EUTRAN access network equipment transmission, and order terminal is switched to target side.
13a, UE turn to target GERAN networks.
14a, target BSS detects UE and is switched to Target cell.
15a, UE switching are linked into target GERAN.
If UE also has the business of other non-voices before the handover, UE starts to initiate hang-up process, notifies target SGSN sends to suspend request to give source MME.Source MME returns to hang-up and responds to target SGSN, mobile management of the response message comprising UE and bearer context.Processing to the business of other non-voices can be not limited thereto by the way of.
16a, target BSS send switching completion " Handover Complete " message and give target MSC Server/MGW.
17a, target MSC Server/MGW notify source MSC Server/MGW handoff completion messages " SES (HO complete) ".
18a, is compatible fixed net system, and target MSC Server/MGW may notify source MSC
Server/MGW response messages " ANSWER ".
The downlink data received is sent to target MSC Server/MGW by source MSC Server/MGW in 17a or 18a by the circuit connection between source MSC Server/MGW and target MSC Server/MGW.
19a, source MSC Server/MGW send PS to CS handoff completion messages be " PS to CS HO complete " give source MME, notify its UE to have been switched to target side；Source MME sends PS to CS and has switched confirmation message i.e. " PS to CS HO complete Acknowledge " to source MSC Server/MGW to confirm.
If desired, source MSC Server/MGW can go to home registration server/attaching position register（ Home Subscriber Server / Home Location Register ；Hereinafter referred to as：HS S/HLR) more new position process, the data such as the signing information to obtain UE.After audio call terminates, if UE is still resided in GERAN access networks, UE initiates routing update process, recovers the Packet Service hung up.
20a, source MME are received after " PS to CS HO complete " message that source MSC Server/MGW are sent, and source MME carries out bearer update to SGW/PGW.
Source MSC Server/MGW are carried the parameters such as the IP/PORT/TEID of distribution and notified to SGW/PDW by source MME for the SRVCC, are passed through and are indicated " EPS bearer id " in " update bearer " message
Etc. parameter, the carrying of the SRVCC business is turned to source MSC Server/MGW by request SGW/PGW from EUTRAN.If PGW/SGW sends data using GTP bearing modes to source MSC Server/MGW, also need to notify the parameters such as the descending TEID in 10a to PGW/SGW in 20a.
SGW/PGW according to the relevant parameter received by the bearer update by SGW/PGW to source EUTRAN of the SRVCC business be SGW/PGW to source MGW carrying.
21a, SGW/PDW return to response " update bearer resp " to source MME, acknowledge receipt of the solicited message of more new bearer.
If SGW/PGW returns to bearer update and unsuccessfully give source MME, MME is that the SRVCC that the UE is performed switches and can not performed, and can return to failure reason value by ' Ο required NACK " message informings source EUTRAN.
22a, SGW/PGW send SRVCC business datums to source MSC Server/MGW, are then sent to target MSC Server/MGW, target MSC Server/MGW is further continued for GERAN/UTRAN forwarded SRVCC business datums.
22a can start to perform after 20a, can also be performed after 21a.Source MSC Server/MGW are to, it is necessary to carry out code conversion to data, specific method is before target MSC Server/MGW and GERAN/UTRAN forwarding uplink data and downlink data：
For downlink data：SGW/PGW gives source MSC Server/MGW by carrying forwarding voice packet, and source MSC Server/MGW are by recognizing carrying mark（EPS bearer id or E-RAB id) or descending TEID to the real-time protocol (RTP) of the carrying（ Real Time Protocol;Hereinafter referred to as：RTP) voice packet is unpacked, by recognizing the bearer types in build（payload type;Hereinafter referred to as：PT) field, draws the parameters such as the voice coding modes used in SGW/PGW for the user speech bag and packing time；Then the coded format of bearing part is converted into the coded format that user uses in GERAN/UTRAN networks, along with the packet header suitably carried, is sent to target MSC Server/MGW.
For upstream data：Source MSC Server/MGW are connected the VoP that identification user sends with source MGW circuit according to the target MSC Server/MGW of association, peel UDP heads off, the coded format of voice bearer part is converted to the coding lattice for needing to use to the SGW/PGW speech datas forwarded
Formula, then adds IP/UDP/RTP heads to the bearing part after code conversion, and SGW/PGW is sent to by carrying again according to SGW/PGW addresses and/or up TEID;Then SGW/PGW is sent to distal end again.It is considered that needing the coded format that the speech data forwarded to SGW/PGW is used identical with the coded system of the SGW/PGW downlink datas for issuing source MGW.It will also be recognized that parse IP the and PORT information of distance terminal when by being changed to downlink data, the IP/UDP/RTP heads that the bearing part of the upstream data after to code conversion is added are the IP and PORT of the distance terminal parsed.Further, if source MME is sending IP and PORT that SRVCC handover requests carry the distance terminal that the SRVCC business is as notified in the address (such as IP and/or PORT) of distance terminal, the IP/UDP/RTP heads that source MGW is added to the bearing part of the upstream data after code conversion to source MSC Server/MGW.
23a, source MSC Server/MGW indicate message to the conversion of IMS sending domain.
Source MSC Server/MGW send STN-SR to IMS (SCC AS), it is to initiate session conversion to initiate VCC domains flow path switch, for example using " initiation of session transfer (STN-SR) ", or SIP signalings " Invite " message etc..As long as the UE can just trigger the step in the normal transceiving data of GERAN/UTRAN networks starts VCC domains flow path switch.The downlink data that the UE that SGW/PGW is sent can be for example received by source MSC Server/MGW either receives the upstream data for the UE that target BSS is sent to start VCC domains flow path switch or realize by some high-rise trigger mechanisms.SRVCC domain flow path switch can also parallel be performed with data forwarding process, for example, can start to perform after 17a.It can certainly be performed after 18a or 19a.
24a, in the execution stage of session flow path switch, distally updates the Session Description Protocol having（Session
Description Protocol ；Hereinafter referred to as：SDP CS accesses " leg "), at this moment descending VOIP packets, which switch to CS, accesses " leg ", i.e., distally start to send VOIP data to source MSC Server/MGW.
25a, translates and puts IMS accesses " leg ", and delete the carrying of the user in SGW/PGW.Fig. 4 is deleting bearing signaling diagram in the embodiment of the method two of data transfer in SRVCC handoff procedures of the present invention, as shown in figure 4, being specially：IMS sends " SIP:BYE " message gives agent call session
Control function (Proxy-Call Session Control Function；Hereinafter referred to as：P-CSCF) announcement session terminates, and P-CSCF continues the message to issue "Policy and Charging Rules Function entity again（Policy and Charging Rules Function;Hereinafter referred to as：), PCRF the carrying for putting the UE of this in SGW/PGW is translated by PCRF notices SGW/PGW.
The method for the SRVCC switchings that the present embodiment is provided, by SRVCC handoff procedures are completed
The carrying that VCC domains transfer process is set up between source MGW and SGW/PGW before completing is used for transmitting voice service data, it is possible to reduce the service disconnection produced by the flow path switch of VCC domains, and then reduces the total business interruption time of whole SRVCC handoff procedures；And if link switching failure of eating dishes without rice or wine, VCC domains flow path switch can be cancelled, it is to avoid service fail.
Fig. 5 is the flow chart of embodiment of the method three that SRVCC of the present invention switches, and this method is corresponding with above-mentioned second of situation, as shown in figure 5, this method is specifically included：
Lb ~ 10b is identical with la ~ 10a in Fig. 4 respectively, and no longer Redundant is stated here.
1 lb, source MME sends the load creating request created with source MGW carrying to PGW/SGW, the newly-built carrying of instruction and SGW/PGW to EUTRAN former bearing association, and require that PGW/SGW passes through the solicited message that newly-built carrying carries out bi-casting with original carrying to SRVCC business.
Solicited message such as " CREATE CS BEARER REQUEST " message or other message, for example carrying parameter needs bi-casting " EPS bearer ID " (to indicate to need the former carrying to association to set up new bearer, and do double hairs), and/or in MSC Server/MGW be the newly-built bearing parameter of SRVCC business, such as address ip and/or PORT information.
If PGW/SGW using GTP bearing modes to MGW send data, l ib also need by
Descending TEID in 10b is notified to SGW.
12b, PGW/SGW return to response message and give source MME.
For example using " CREATE CS BEARER RESPONSE " or other message, message informing source MME, SGW/PGW carryings are successfully established, and now, have two carryings between EUTRAN and source MGW respectively from SGW/PGW for SRVCC business.
Indicate to perform to MSC in source MME response message if SGW/PGW is returned to
Server/MGW data forwarding, then source MME is that the SRVCC switchings that the UE is performed can not be performed by " HO required NACK " message informing source EUTRAN, and can return to failure reason value.
13b, source MME can also notify source MSC Server/MGW, and the load between SGW/PGW and source MGW is successfully established.
14b, source MSC Server/MGW can also return to response message.
15b, SGW/PGW are to source MSC Server/MGW and EUTRAN bi-casting datas；
SRVCC business is sent from SGW/PGW to EUTRAN, source MSC Server/MGW are also sent to by newly-built carrying, the CS domains resource associations that source MGW reserves the newly-built carrying with GERAN/UTRAN, are further continued for target GERAN/UTRAN forwarded user data.The step can be just performed after l ib.
Source MSC Server/MGW are to, it is necessary to carry out code conversion to data, specific method is before target MSC Server/MGW and GERAN/UTRAN forwarding uplink data and downlink data：
For downlink data：SGW/PGW forwards voice packet to give source MSC Server/MGW by newly-established carrying, and source MSC Server/MGW are by recognizing carrying mark（EPS bearer id or E-RAB id) or descending TEID the RTP voice packets of the carrying are unpacked, by recognizing the PT in build (ayload type) field, the parameters such as the voice coding modes used in SGW/PGW for the user speech bag and packing time are drawn；Then the coded format of bearing part is converted into the coded format that user uses in GERAN/UTRAN networks, along with the packet header suitably carried, is sent to target MSC Server/MGW
For upstream data：Source MSC Server/MGW are connected the VoP that identification user sends with source MGW circuit according to the target MSC Server/MGW of association, the coded format of speech data part is converted to the coded format for needing to use to the SGW/PGW speech datas forwarded, then IP/UDP/RTP heads are added to the bearing part after code conversion, SGW/PGW is sent to according to SGW/PGW addresses and/or up TEID again;Then SGW/PGW is sent to distal end again.It is considered that needing the coded format that the speech data forwarded to SGW/PGW is used identical with the coded system of the SGW/PGW downlink datas for issuing source MGW.It will also be recognized that parsing distal end when by being changed to downlink data
IP the and PORT information of terminal, the IP/UDP/RTP heads that the bearing part of the upstream data after to code conversion is added are the IP and PORT of the distance terminal parsed.Further, if source MME is carrying the SRVCC business in the address of distance terminal to source MSC Server/MGW transmissions SRVCC handover requests（Such as IP and/or PORT), the IP/UDP/RTP heads that source MGW is added to the bearing part of the upstream data after code conversion are the IP and PORT of the distance terminal notified.
16b, source MME send access network equipment of switching command " Handover Command " message to E-UTRAN.
From EUTRAN switching commands " Handover from E-UTRAN Command ", message is to UE for 17b, EUTRAN access network equipment transmission, and order terminal is switched to target side.
18b, UE turn to target GERAN networks.
19b, target BSS detects UE and is switched to Target cell.
20b, UE switching are linked into target GERAN.
If UE also has the business of other non-voices before the handover, UE starts to initiate hang-up process, notifies target SGSN sends to suspend request to give source MME.Source MME returns to hang-up and responds to target SGSN, mobile management of the response message comprising UE and bearer context.Processing to the business of other non-voices can use other manner, be not limited thereto.
21b, target BSS send switching completion " Handover Complete " message and give target MSC Server/MGW.
22b, target MSC Server/MGW notify source MSC Server/MGW handoff completion messages " SES (HO complete) ".
23b, is compatible fixed net system, and target MSC Server/MGW may notify source MSC Server/MGW response messages " ANSWER ".
The downlink data received is sent to target MSC Server/MGW by source MSC Server/MGW in 22b or 23b by the circuit connection between source MSC Server/MGW and target MSC Server/MGW
It is " PS to CS HO that 24b, source MSC Server/MGW, which send PS to CS handoff completion messages,
Complete " gives source MME, notifies its UE to have been switched to target side；Source MME sends PS to CS and has switched confirmation message i.e. " PS to CS HO complete Acknowledge " to source MSC Server/MGW to confirm.
If desired, source MSC Server/MGW can go to HSS/HLR more new position process, the data such as signing information to obtain UE.After audio call terminates, if UE is still resided in GERAN access networks, UE initiates routing update process, recovers the Packet Service hung up.
25b, source MSC Server/MGW indicate message to the conversion of IMS sending domain.
Source MSC Server/MGW send STN-SR to IMS (SCC AS), it is to initiate session transmissions to initiate VCC domains flow path switch, for example using " initiation of session transfer (STN-SR) ", or SIP signalings " Invite " message etc..As long as the UE can just trigger the step in the normal transceiving data of GERAN/UTRAN networks starts VCC domains flow path switch.The downlink data that the UE that SGW/PGW is sent can be for example received by source MSC Server/MGW either receives the upstream data for the UE that target BSS is sent to start VCC domains flow path switch or realize by some high-rise trigger mechanisms.SRVCC domain flow path switch can also parallel be performed with data forwarding process, for example, can start to perform after 22b.It can certainly be performed after 23b or 24b.
26b, the execution stage of session flow path switch, the CS accesses " leg " for the Session Description Protocol SDP having distally are updated, at this moment descending VOIP packets, which switch to CS, accesses " leg ", i.e., distally start to send VOIP data to source MSC Server/MGW.
27b, translates and puts IMS accesses " leg ", and deletes the carrying of the user in SGW/PGW, including the carrying between carrying between SGW/PGW and EUTRAN and SGW/PGW and source MGW.
The process of carrying in the present embodiment between carryings and SGW/PGW and EUTRAN of the source of release MSC Server/MGW between SGW/PGW describes that process is similar to above-mentioned fact Example, and here is omitted.
The method for the SRVCC switchings that the present embodiment is provided, can reduce the service disconnection produced by the flow path switch of VCC domains by way of data bi-casting, reduce the total business interruption time of whole SRVCC handoff procedures；And if link switching failure of eating dishes without rice or wine, VCC domains flow path switch can be cancelled, it is to avoid business is lost
Lose.
Fig. 6 is the flow chart of embodiment of the method four that SRVCC of the present invention switches, and figure is using the present invention
7 equipment included are only used in explanation present invention method, to be not offered as in the system that the present invention is provided and so include equipment in all figures, as shown in Figure 6 and Figure 7, this method includes：
200, in Radio Link handoff procedure, the circuit connection set up between target Mobile Switching Center Server/WMG in source WMG and the first network in first network.
201, in the Radio Link handoff procedure, source Mobile Switching Center Server in the first network starts the domain transfer process in SRVCC switchings, wherein, Voice traffic data before the domain transfer process being electrically connected in SRVCC switchings is completed in transmission SRVCC handoff procedures, by source WMG when between Voice traffic data grouped data network gateway in the second network and gateway.
As illustrated, line 1 represents the carrying path before Radio Link switching, line 2 represents the carrying path before the conversion of VCC domains in the embodiment of the present invention.The second network described in the present embodiment can be evolvement network such as EUTRAN networks and its core net, and abbreviation EUTRAN, first network can be legacy network such as GERAN/UTRAN networks and its core net, abbreviation GERAN/UTRAN.It is in the present embodiment that MSC Server and MGW is separately positioned, it is simultaneously also that PGW and SGW is separately positioned, and MGW is arranged between PGW and SGW, source MSC Server/MGW are attributed in GERAN/UTRAN by the present embodiment, so that PGW is sent to source SGW and source SGW and is sent to PGW Voice traffic data by source MGW, for example using routing mode, the packet of user can be made all by source MGW by carrying out route setting to PGW;Or unify source MGW and PGW, as same entity the data of user can also be realized all by source MGW.Source MGW can also be integrated with PGW in the present embodiment, it might even be possible to only set PGW, and the PGW is loaded to MGW function.Source MME is sent in source MSC Server PS to CS handover requests, notifies the up TEID or PGW of SRVCC business address and descending TEID or SGW address.Source MSC Server continue PS to CS switchings.Terminal successful switch is to after GERAN/UTRAN, and source MSC Server are sent to source MGW to be updated connection and indicate message, notifies source MGW by the data forwarding of SRVCC business
To target MSC Server/MGW, including SRVCC business up-down bidirectional data.The connection instruction message that updates includes up relevant parameter and descending relevant parameter, and the relevant parameter is connected association with for the source MGW of SRVCC traffic assignments with target MSC Server/MGW circuit, the up relevant parameter includes PGW IP and/or up TEID, and the descending relevant parameter includes SGW IP and/or descending TEID.Source MGW is by recognizing descending TEID or SGW addresses, the downlink data for being sent to terminal is forwarded to target MSC Server/MGW, source MGW is connected the upstream data of identification terminal transmission according to the target MSC Server/MGW with PGW addresses or up TEID associations with source MGW circuit, and code conversion is carried out to the upstream data of the SRVCC business.
Terminal successful switch is to after GERAN/UTRAN, starting to start IMS domain flow path switch, and source MSC Server indicate message to the conversion of IMS sending domain, and domain conversion indicates that message can be session conversion message, carries the session translation number of SRVCC business（Hereinafter referred to as：), STN-SR instruction message can also be changed using " Invite " message of SIP signalings as domain.
The carrying set up in the present embodiment can source MGW receive IMS transmissions translate put notice after translated and put, i.e. after the conversion of VCC domains is completed, IMS can indicate the deleting load-bearing that source MGW will be set up between target MGW, translate the resource for bleeding off and being distributed for the carrying.Former carrying in the present embodiment between SGW/PGW and EUTRAN can be released after the SGW/PGW releases for receiving IMS transmissions are notified, i.e. after the conversion of VCC domains is completed, IMS can indicate that SGW/PGW, by the deleting load-bearing between EUTRAN, translates the resource for bleeding off and being distributed for the link.Further, IMS is in session transmissions flow is performed, IMS sends user response message ISUP ANM (ISDN User Part ANswer Message) message informing to MSC Server by MGCF MGCF (Media Gateway Control Function) and connects SRVCC business with remote subscriber, source MSC Server notify source MGW to stop forwarding the SRVCC business for being sent to EUTRAN originally to target MSC Server/MGW, such as send " remove " message.
Source MGW is during SRVCC business datums are transmitted, in addition it is also necessary to carry out code conversion to upstream data or downlink data, specifically, and source MGW carries out code conversion according to carrying mark or descending TEID to the downlink data of the SRVCC business；Or source MGW is by should SRVCC business
Target MSC Server/MGW and source MGW CS domains resource（Circuit is connected）Carry out the upstream data of identification terminal transmission, code conversion is carried out to the upstream data of the SRVCC business.The downlink data of institute's voice traffic carries out code conversion and referred to, and source MGW is connected before sending data to the circuit, and the coded system of the data is converted into the coded system that terminal is used in GERAN/UTRAN；The upstream data of institute's voice traffic carries out code conversion and referred to, and source MGW is received after the data sent in the circuit connection, and the coded system of the data is converted into the coded system that distal end is used.
The method that the present embodiment is provided reduces the service disconnection produced by the flow path switch of VCC domains by data forwarding mode, it is possible to reduce the total business interruption time of whole SRVCC handoff procedures；And if link switching failure of eating dishes without rice or wine, VCC domains flow path switch can be cancelled, it is to avoid service fail.
Fig. 8 is the flow chart of embodiment of the method five that SRVCC of the present invention switches, as shown in figure 8, this method is specifically included：
Lc, UE send measurement report to EUTRAN.
2c, EUTRAN determine to be triggered to GERAN switching.
The present embodiment is illustrated by taking GERAN as an example.
3c, EUTRAN, which send switching, needs " Handover Required " message to give source MME;The message includes Target cell or Base Station Identification, source to target side transparent vessel（Source to Target Transparent Container), at the same EUTRAN base stations indicate source MME this to cut be SRVCC switching.
4c, switches according to EUTRAN SRVCC and indicates, grade of service marks of the source MME based on carrying（ Quality Class Identity;Referred to as：QCI) the voice bearer that identification is present, and voice bearer is separated.
5c, source MME sends SRVCC handover requests message such as " PS to CS request " message to source MSC Server, wherein carry the voice " CODEC list " of SRVCC UE supports, the TEID to source " MSC Server " source voice bearer is also notified including source MME, to carry out the TEID of SRVCC voice bearer, including up TEID and descending TEID.
Source MME can be reported, and store by TAU flows by terminal by being somebody's turn to do " CODEC list "
In source MME;Or eNB, by being inquired about to UE transmitting capacities, obtaining UE ability includes " CODEC list ", passes to source MME and is stored in source MME.
6c, source MSC Server send SRVCC handover requests such as " Prepare Handover Request " message to target MSC Server/MGW, perform across MSC switching flow, and reserve CS domains resource for the SRVCC business.
7c, interaction handover request and confirmation message between target MSC Server/MGW and target BSS, to perform resource allocation.
8c, target MSC Server/MGW send preparation handoff response " Prepare Handover Response " message and give source MSC Server.
9c, the circuit connection set up between target MSC Server/MGW and source MGW.
10c, PS to CS switching response messages are given in source MME, message comprising target side to source transparent vessel cell before MSC server is sent.
11c, source MME send access network equipment of switching command " Handover Command " message to E-UTRAN.
12c, EUTRAN access network equipment are sent from EUTRAN switching commands " Handover from
E-UTRAN Command " message is switched to target side to UE, order terminal.
13c, UE turn to target GERAN networks.
14c, target BSS detects UE and is switched to Target cell.
15c, UE switching are linked into target GERAN.
If UE also has the business of other non-voices before the handover, UE starts to initiate hang-up process, notifies target SGSN sends to suspend request to give source MME.Source MME returns to hang-up and responds to target SGSN, mobile management of the response message comprising UE and bearer context.Processing to the business of other non-voices, can use other manner, be not limited thereto.
16c, target BSS send switching completion " Handover Complete " message and give target MSC Server/MGW
17c, target MSC Server/MGW notify source MSC Server handoff completion messages " SES (HO
complete ) " 。
18c, is compatible fixed net system, and target MSC Server/MGW may notify source MSC Server response messages " ANSWER ".
19c, source MSC Server are received after 17c or 18c message, sent to source MGW and update connection instruction message, such as " modify connection ", the address comprising the up TEID comprising SRVCC business or PGW and descending TEID or SGW address in the message.
20c, source MGW, which receive to return after instruction message, responds to source MSC Server.
21c, source MGW are forwarded to the data for being sent to EUTRAN originally to target MSC Server/MGW, are also forwarded including the target MSC Server/MGW data sent to PGW.
The descending TEID and/or SGW addresses of the downlink data of terminal are sent to by identification, pass through source
Circuit connection between MGW and target MSC Server/MGW is sent to target MSC Server/MGW, then is sent to target GERAN/UTRAN.
The upstream data sent come identification terminal is connected with source MGW circuit by PGW addresses and/or up TEID associated objects MSC Server/MGW, and the upstream data of terminal is sent to by PGW according to PGW addresses and/or up TEID, then it is sent to distance terminal.
Source MGW will also carry out the conversion of coded system, the He of specific method be the same as Example one to forwarding data
21c can start to perform after 19c message is received.
22c, source MSC Server send PS to CS handoff completion messages be " PS to CS HO complete " give source MME, notify its UE to have been switched to target side；Source MME sends PS to CS and has switched confirmation message i.e. " PS to CS HO complete Acknowledge " to source MSC Server/MGW to confirm.
If desired, source MSC Server can go to HSS/HLR more new position process, the data such as signing information to obtain UE.After audio call terminates, if UE is still resided in GERAN access networks, UE initiates routing update process, recovers the Packet Service hung up.
23c, source MSC Server indicate message to the conversion of IMS sending domain.
Source MSC Server/MGW send STN-SR to IMS (SCC AS), it is to initiate session conversion to initiate VCC domains flow path switch, for example using " initiation of session transfer (STN-SR) ", or SIP signalings " Invite " message etc..VCC domains flow path switch can be restarted with PS to CS switching completions, can be received in source MSC Server target MSC Server/MGW transmission handoff completion message " SES (HO complete);; or " ANSWER " just start, can also the UE can restart in the normal transceiving data of GERAN/UTRAN networks.
24c, in the execution stage of session flow path switch, distally updates the Session Description Protocol having（Session Description Protocol ；Hereinafter referred to as：SDP CS accesses " leg "), at this moment descending VOIP packets, which switch to CS, accesses " leg ", i.e., distally start to send VOIP data to source MGW.
Further, IMS is in session flow path switch is performed, circuit establishment of connection is completed in GERAN/UTRAN, i.e. VOIP packets start to switch to after CS domains, notice source MGW is needed to stop the forwarding to PGW to VOIP data, idiographic flow such as Fig. 9, Fig. 9 are deleting bearing signaling diagram in the embodiment of the method five of data transfer in handoff procedure of the present invention.IMS sends SIP signalings to MGCF, MGCF sends ISUP answer messages to MSC Server again and notifies to connect SRVCC business with remote subscriber, source MSC Server notify source MGW to stop forwarding the SRVCC business for being sent to EUTRAN originally to target MSC Server/MGW, such as send and remove " remove " message.
25c, translates and puts IMS accesses " leg ", and delete the carrying of the user in SGW/PGW.This
The process of carrying between EUTRAN describes that process is similar to above-mentioned fact Example, and no longer Redundant is stated herein.
The method that the present embodiment is provided, realizes data to target by Mc Interface Controllers source MGW
GERAN/UTRAN is forwarded, and reduces the service disconnection produced by the flow path switch of VCC domains, it is possible to reduce the total business interruption time of whole SRVCC handoff procedures；And if link switching failure of eating dishes without rice or wine, VCC domains flow path switch can be cancelled, it is to avoid service fail.
One of ordinary skill in the art will appreciate that：Realizing all or part of step of above method embodiment can be completed by the related hardware of programmed instruction, foregoing program can be stored in a computer read/write memory medium, the program upon execution, performs the step of including above method embodiment；And it is foregoing
Storage medium include：ROM, RAM, magnetic disc or CD etc. are various can be using Jie Figure 10 of store program codes as the structural representation of media gateway embodiment one of the present invention, as shown in Figure 10, the WMG 100, which is located at first network, includes first processing module 11, the processing module 13 of Second processing module 12 and the 3rd.
First processing module 11 be used for terminal set up from the Radio Link handoff procedure of the second network to first network and the second network in gateway/packet data gateway carrying；Second processing module
12 are used for the information that the terminal that basis is known in the Radio Link handoff procedure is switched to the first network, start the domain transfer process in SRVCC switchings；3rd processing module 13 is used to transmit the Voice traffic data from the terminal to gateway/packet data gateway in the carrying that first processing module 11 is set up before the domain transfer process that Second processing module 12 starts is completed.
Specifically, in SRVCC switching flows are carried out, SRVCC switching be by speech business from the second network such as EUTRAN switches to first network such as GERAN/UTRAN, during Radio Link switching is carried out, MGW in GERAN/UTRAN is set up with the SGW/PGW in EUTRAN to be carried, and the Voice traffic data for being transmitted before completion domain is changed and needing to carry out SRVCC switchings is carried on using this, first processing module 11 and SGW/PGW in specific MGW is successfully established after the carrying for transmitting voice service data, the carrying is connected interrelated with the circuit set up in Radio Link handoff procedure by the 3rd processing module 13, the circuit is connected as the circuit connection between the target MSC Server/MGW in MGW and GERAN/UTRAN, after completing to be carried on the association of circuit connection, if there is Voice traffic data to need transmission, then pass through the carrying and the up and/or descending Voice traffic data of circuit connection transmission.
Message is indicated to the conversion of IMS sending domain by Second processing module 12, domain conversion indicates that message can be initialization session conversion message, carries the session transmissions number of SRVCC business（Hereinafter referred to as：), STN-SR can also be with session initiation protocol (Session Initiated Protocol;Hereinafter referred to as：SIP) " Invite " message of signaling indicates message as domain conversion.After the conversion of VCC domains is completed, that is, complete SRVCC switching flows.
Further, WMG 100 can also include fourth processing module 14.
Fourth processing module 14 is used to receive the message comprising the parameter for setting up carrying and the information of voice coding list, and the parameter for setting up the carrying includes the address information of the gateway/packet data gateway.
The present embodiment provide MGW by complete SRVCC switching before set up source MGW with
Carrying between SGW/PGW is used for the mode of transmitting voice service data, it is possible to reduce the service disconnection produced by the flow path switch of VCC domains, reduces the total business interruption time of whole SRVCC handoff procedures；And if link switching failure of eating dishes without rice or wine, VCC domains flow path switch can be cancelled, it is to avoid service fail.
Figure 11 a are the structural representation of gateway embodiment one of the present invention, as shown in fig. 11a, and the gateway 200 is located in the second network and including the 5th processing module 21 and the 6th processing module 22.
5th processing module 21 is used for during terminal carries out SRVCC switchings, the carrying between source Mobile Switching Center Server/WMG in foundation and first network；6th processing module 22 is used to transmit the Voice traffic data for being sent to the terminal to source Mobile Switching Center Server/WMG in the carrying that the 5th processing module 21 is set up before the VCC domains transfer process during SRVCC switches is completed.
Specifically, in SRVCC switching flows are carried out, SRVCC switching be by speech business from the second network such as EUTRAN switches to first network such as GERAN/UTRAN, during Radio Link switching is carried out, the 5th processing module 21 in EUTRAN SGW is set up with the MGW in GERAN/UTRAN to be carried, 6th processing module 22 is responsible for receiving up Voice traffic data from the carrying, and descending Voice traffic data is sent into MGW by the carrying.
Further, gateway 200 can also include：Information receiving module 230.
Information receiving module 230 is used for the information for receiving the parameter that carrying is set up comprising the 5th processing module 21, and the information of the parameter of foundation carrying includes the address information of source Mobile Switching Center Server/WMG.
Further, information receiving module 230 is additionally operable to receive bearer update request message, and the bearer update request message includes the information for the parameter for setting up carrying；5th processing module 21 is additionally operable to according to carrying
Request message foundation and the carrying of source Mobile Switching Center Server/WMG is updated to replace the carrying between gateway/grouped data network gateway and the access network of the second network.
Further, information receiving module 230 is additionally operable to receive load creating request message, and the load creating request message includes the information of the parameter for setting up carrying；5th processing module 21 is additionally operable to the carrying according to the foundation of load creating request message and source Mobile Switching Center Server/WMG, and keeps the carrying between the access network of gateway/grouped data network gateway and the second network.Put the 7th processing module 23 of the carrying between MGW and SGW.After SRVCC switchings are completed, the 7th processing module 23 discharges the carrying between SGE and MGW, also to be translated and bled off by the 7th processing module 23 if it there is the carrying between SGW and EUTRAN.
The SGW that the present embodiment is provided can reduce the total business interruption time of whole SRVCC handoff procedures；And if link switching failure of eating dishes without rice or wine, VCC domains flow path switch can be cancelled, it is to avoid service fail.
It is a kind of mobile management entity structural representation provided in an embodiment of the present invention to scheme l ib, and the mobile management entity 300 includes：Transmitting element 310.
Transmitting element 310 is used in terminal from the Radio Link handoff procedure of the second network to first network, sends the parameter comprising foundation carrying to source Mobile Switching Center Server/WMG in first network；Wherein, the parameter includes the address information of gateway/packet data gateway in the second network, source Mobile Switching Center Server/the WMG sets up the carrying with gateway/packet data gateway according to the parameter, and domain transfer process of the source Mobile Switching Center Server/WMG in SRVCC switching flows carrys out the Voice traffic data of self terminal to gateway/packet data gateway before completing using carrying transmission.
Further, the address information of gateway/packet data gateway is the IP address information and Tunnel End Point Identifier information of gateway/packet data gateway；Or, the address information of gateway/packet data gateway is the IP address information and port information of gateway/packet data gateway.
Further, the mobile management entity 300 also includes：Receiving unit 320.
After the parameter of carrying and the information of voice coding list are set up in the transmission of transmitting element 310, receiving unit 320 receives the SRVCC handover request ack messages that source Mobile Switching Center Server/WMG is returned, and SRVCC handover request ack messages include the information and source Mobile Switching Center Server/WMG of the voice coding modes for the terminal support that source Mobile Switching Center Server/WMG is selected in voice coding list to set up the address information of source Mobile Switching Center Server/WMG determined by carrying；
Before domain transfer process completion, transmitting element 310 is additionally operable to the address information of transmission source Mobile Switching Center Server/WMG to gateway/packet data gateway；
Wherein, gateway/packet data gateway sets up the carrying with source Mobile Switching Center Server/WMG according to the address information of source Mobile Switching Center Server/WMG, and gateway/packet data gateway is sent to the Voice traffic data of terminal to source Mobile Switching Center Server/WMG before the completion of domain transfer process using carrying transmission.
Further, transmitting element 310 is additionally operable to after source mobile management entity receives the information that Radio Link switching is completed and before the completion of domain transfer process, bearer update request message is sent to gateway/packet data gateway, the bearer update request message includes the address information of source Mobile Switching Center Server/WMG, wherein, according to the bearer update request message, gateway/the grouped data network gateway and source Mobile Switching Center Server/WMG set up carrying of the carrying to replace between the gateway/grouped data network gateway and the access network of second network.
Further, transmitting element 310 is additionally operable to after source mobile management entity receives SRVCC handover request ack messages and before source mobile management entity receives the information that Radio Link switching is completed, load creating request message is sent to gateway/packet data gateway, the load creating request message includes the address information of source Mobile Switching Center Server/WMG, wherein, according to the load creating request message, gateway/the grouped data network gateway sets up the carrying with the source Mobile Switching Center Server/WMG, and keep carrying between the access network of the gateway/grouped data network gateway and second network.
The mobile management entity that the present embodiment is provided, by before SRVCC switchings are completed, sending related
Parameter assist the carrying set up between source MGW and SGW/PGW to be used for transmitting voice service data to source MGW and SGW/PGW, and then the service disconnection produced by the flow path switch of reduction VCC domains is reached, reduce the total business interruption time of whole SRVCC handoff procedures.
Figure 12 is the structural representation of inventive network system embodiment one, as shown in figure 12, and the network system 400 includes the MGW1 and the SGW2 in the second network being located in first network.
In Radio Link handoff procedure, MGW1 and SGW2, which is set up, to be carried, the carrying is connected with circuit and is associated, and connect the circuit connection that transmission needs set up between the Voice traffic data that single-receiver voice continuously switches, target Mobile Switching Center Server/WMG that the circuit is connected as in the WMG and the first network in the carrying and the circuit；SGW2 receives the uplink voice traffic data of the carrying transmission and/or downlink voice business datum is sent in the carrying.
Further, network system 400 can also include mobile management entity 3.The mobile management entity 3 completes mobile management entity all functions in source in above method embodiment.
The applicable SRVCC switchings of network system that the present embodiment is provided be by speech business from the second network such as EUTRAN switches to first network such as GERAN/UTRAN, the MGW and SGW that present networks system is related to can use each MGW and SGW provided in above-described embodiment, and no longer Redundant is stated its 26S Proteasome Structure and Function herein.
Figure 13 is the structural representation of media gateway embodiment two of the present invention, as shown in figure 13, and the WMG 500 includes the 8th processing module 31 and the 9th processing module 32.
8th processing module 31 is used in Radio Link handoff procedure, and the circuit between target Mobile Switching Center Server/WMG in foundation and first network is connected；9th processing module 32 is used for the Voice traffic data in the circuit connection that the 8th processing module 31 is set up in transmission SRVCC handoff procedures before the domain transfer process in SRVCC switchings is completed, and passes through WMG 500 when between Voice traffic data grouped data network gateway in the second network and gateway.
Specifically, in SRVCC switching flows are carried out, SRVCC switching be by speech business from
Second network such as EUTRAN is switched in first network such as GERAN/UTRAN, during Radio Link switching is carried out, the 8th processing module 31 in MGW and the target MSC Server/MGW in GERAN/UTRAN are set up after circuit is connected, 9th processing module 32 receives the renewal connection instruction message that source MSC Server are sent, renewal connection indicates that message includes up relevant parameter and descending relevant parameter, up relevant parameter and the connection of descending relevant parameter and circuit are associated by the 9th processing module 32, may then pass through circuit connection forwarding needs to carry out the Voice traffic data of SRVCC switchings.MGW can be belonged to GERAN/UTRAN in the present embodiment.
Further, WMG 500 can also include：Tenth processing module 33.
Tenth processing module 33 is used to receive the renewal connection instruction message that the source Mobile Switching Center Server in first network is sent, and renewal connection indicates that message includes up parameter and downstream parameter；
9th processing module 32 is used for the instruction of the renewal connection instruction message received according to the tenth processing module 33, the Voice traffic data in the circuit connection that the 8th processing module 31 is set up in transmission SRVCC handoff procedures.
The present embodiment offer MGW avoids the service disconnection produced by the flow path switch of VCC domains by data forwarding mode, reduces the total business interruption time of whole SRVCC handoff procedures；And if link switching failure of eating dishes without rice or wine, VCC domains flow path switch can be cancelled, it is to avoid service fail.
Figure 14 is the structural representation of inventive network system embodiment two, as shown in figure 14, the network system 600 includes being arranged at the MGW3 between the grouped data network gateway in the second network and gateway and target MSC Server/MGW4 in first network.
In Radio Link handoff procedure, MGW3 sets up circuit with target MSC Server/MGW4 and is connected, the renewal connection that reception source mobile switching centre sends is indicated after message, the connection instruction message that updates includes up relevant parameter and descending relevant parameter, the up relevant parameter and descending relevant parameter are connected with the circuit and are associated, MGW3 and target MSC Server/MGW4 connect transmission by the circuit and need to carry out the Voice traffic data that single-receiver voice continuously switches.
The SRVCC switchings that the network system that the present embodiment is provided is applicable are that present networks system is related to by speech business from the second network such as EUTRAN switches to first network such as GERAN/UTRAN
MGW can use each MGW provided in above-described embodiment, and no longer Redundant is stated its 26S Proteasome Structure and Function herein.Other manner can also be taken to the processing of non-voice service in above-described embodiment, the mode such as switched parallel with speech business is not limited thereto.
Finally it should be noted that：The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although the present invention is described in detail with reference to the foregoing embodiments, it will be understood by those within the art that：It can still modify to the technical scheme described in foregoing embodiments, or carry out equivalent substitution to which part technical characteristic；And these modifications or replacement, the essence of appropriate technical solution is departed from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (34)
- Claims1st, a kind of method of SRVCC switchings, it is characterised in that including：In terminal from the Radio Link handoff procedure of the second network to first network, source Mobile Switching Center Server/WMG in the first network sets up the carrying with gateway/packet data gateway in second network；Source Mobile Switching Center Server/the WMG is switched to the information of the first network according to the terminal known, starts the domain transfer process in SRVCC switchings；Wherein, before the domain transfer process is completed, the Voice traffic data in the carrying transmission SRVCC switchings.2nd, the method as described in claim 1, it is characterised in that the carrying that source Mobile Switching Center Server/WMG in the first network is set up with gateway/packet data gateway in second network includes：The source Mobile Switching Center Server/WMG receives the message for including the parameter for setting up the carrying, and the parameter for setting up the carrying includes the address information of the gateway/packet data gateway.3rd, method as claimed in claim 2, it is characterised in thatThe address information of the gateway/packet data gateway is the IP address information and Tunnel End Point Identifier information of the gateway/packet data gateway；Or,The address information of the gateway/packet data gateway is the IP address information and port information of the gateway/packet data gateway；Or,The address information of the gateway/packet data gateway is IP address information, port information and the Tunnel End Point Identifier information of the gateway/packet data gateway.4th, method as claimed in claim 2, it is characterised in that the source Mobile Switching Center Server/WMG is switched to the information of the first network according to the terminal known, the domain transfer process started in SRVCC switchings includes：The terminal according to knowing is switched to the information of the first network, the source mobile switching centre Server/WMG transmits the Voice traffic data in the carrying, then starts the domain transfer process；Or,The terminal according to knowing is switched to the information of the first network, and the source Mobile Switching Center Server/WMG starts the domain transfer process, the Voice traffic data is then transmitted in the carrying；Or,The terminal according to knowing is switched to the information of the first network, and the source Mobile Switching Center Server/WMG starts the domain transfer process, and transmits in the carrying Voice traffic data.5th, method as claimed in claim 2, it is characterised in that the source Mobile Switching Center Server/WMG is switched to the information of the first network according to the terminal known, the domain transfer process started in SRVCC switching flows includes：The information of the voice coding modes used according to the terminal in the first network, the source Mobile Switching Center Server/WMG transmits the Voice traffic data in the carrying；The terminal according to knowing is switched to the information of the first network, and the source Mobile Switching Center Server/WMG starts the domain transfer process.6th, the method as described in claim 1, it is characterised in that the domain transfer process in the startup SRVCC switching flows, including：Source Mobile Switching Center Server/the WMG indicates message to the conversion of IP multimedia core network subsystems sending domain, and the domain conversion indicates that message is used to indicate that the IP multimedia core network subsystems carry speech business from packet-switched domain carrying conversion to the circuit commutative field in the first network in second network.7th, a kind of method of data transfer during SRVCC switches, it is characterised in that including：Terminal is during SRVCC switchings are carried out, and gateway/packet data gateway in the second network sets up the carrying with source Mobile Switching Center Server/WMG in first network；Wherein, before the domain transfer process in the SRVCC handoff procedures is completed, the Voice traffic data in the carrying transmission SRVCC handoff procedures. 8th, method as claimed in claim 7, it is characterised in that the carrying that gateway/packet data gateway in second network is set up with source Mobile Switching Center Server/WMG in first network includes：The gateway/packet data gateway receives the information for including the parameter for setting up the carrying, and the information of the parameter for setting up the carrying includes the address information of the source Mobile Switching Center Server/WMG.9th, method as claimed in claim 8, it is characterised in thatThe address information of the source Mobile Switching Center Server/WMG is the IP address information and Tunnel End Point Identifier information of the source Mobile Switching Center Server/WMG；Or,The address information of the source Mobile Switching Center Server/WMG is the IP address information and port information of the source Mobile Switching Center Server/WMG；Or,The terminal according to knowing is switched to the information of the first network, and the source Mobile Switching Center Server/WMG starts the domain transfer process, and transmits in the carrying Voice traffic data.10th, method as claimed in claim 8, it is characterised in that the gateway/packet data gateway, which receives the information comprising the parameter for setting up the carrying, to be included：In the terminal from the Radio Link handoff procedure of second network to the first network, the information that bearer update request message described in the bearer update request message that the gateway/packet data gateway reception source mobile management entity is sent includes the parameter for setting up the carrying, the information of the parameter for setting up the carrying includes the address information that the source Mobile Switching Center Server/WMG is sent to the source Mobile Switching Center Server/WMG of the source mobile management entity；According to the bearer update request message, the gateway/grouped data network gateway and source Mobile Switching Center Server/WMG set up carrying of the carrying to replace between the gateway/grouped data network gateway and the access network of second network.11st, method as claimed in claim 8, it is characterised in that the gateway/packet data gateway, which receives the information comprising the parameter for setting up the carrying, to be included： In the terminal from the Radio Link handoff procedure of second network to the first network, the information that load creating request message described in the load creating request message that the gateway/packet data gateway reception source mobile management entity is sent includes the parameter for setting up the carrying, the information of the parameter for setting up the carrying includes the address information that the source Mobile Switching Center Server/WMG is sent to the source Mobile Switching Center Server/WMG of the source mobile management entity；According to the load creating request message, gateway/the grouped data network gateway sets up the carrying with the source Mobile Switching Center Server/WMG, and keeps the carrying between the access network of the gateway/grouped data network gateway and second network.12nd, a kind of method of data transfer during SRVCC switches, it is characterised in that including：In terminal from the Radio Link handoff procedure of the second network to first network, source mobile management entity sends the parameter comprising foundation carrying to source Mobile Switching Center Server/WMG in the first network；Wherein, the parameter includes the address information of gateway/packet data gateway in second network, source Mobile Switching Center Server/the WMG sets up the carrying with the gateway/packet data gateway according to the parameter, and domain transfer process of the source Mobile Switching Center Server/WMG in SRVCC switching flows uses the Voice traffic data of the carrying transmission terminal before completing.13rd, method as claimed in claim 12, it is characterised in that the source mobile management entity is sent to be included comprising the parameter for setting up carrying to source Mobile Switching Center Server/WMG in the first network：The source mobile management entity sends SRVCC handover requests message to the source Mobile Switching Center Server/WMG, and the SRVCC handoff request messages include the information of the parameter.14th, method as claimed in claim 12, it is characterised in thatThe address information of the gateway/packet data gateway is the IP address information and Tunnel End Point Identifier information of the gateway/packet data gateway；Or,The address information of the gateway/packet data gateway is the gateway/packet data gateway IP address information and port information；Or,The address information of the gateway/packet data gateway is the IP address information and port information and Tunnel End Point Identifier information of the gateway/packet data gateway.15th, method as claimed in claim 12, it is characterised in that also include：After the information of the parameter for setting up carrying is sent, the source mobile management entity receives the SRVCC handover request ack messages that the source Mobile Switching Center Server/WMG is returned, and the information and source Mobile Switching Center Server/WMG that the SRVCC handover request ack messages include the coded system that the terminal is used in first network are the address information for setting up the source Mobile Switching Center Server/WMG determined by the carrying；Before domain transfer process completion, the source mobile management entity sends the address information to the gateway/packet data gateway；Wherein, according to the address information, the gateway/packet data gateway is sent to the Voice traffic data of the terminal to the source Mobile Switching Center Server/WMG before domain transfer process completion using the carrying transmission.16th, method as claimed in claim 15, it is characterised in that the source mobile management entity before domain transfer process completion sends the address information to be included to the gateway/packet data gateway：After the source mobile management entity receives the information that the Radio Link switching is completed and before domain transfer process completion, the source mobile management entity sends bearer update request message to the gateway/packet data gateway, and the bearer update request message includes the address information of the source Mobile Switching Center Server/WMG；Wherein, according to the bearer update request message, the gateway/grouped data network gateway and source Mobile Switching Center Server/WMG set up carrying of the carrying to replace between the gateway/grouped data network gateway and the access network of second network.17th, method as claimed in claim 15, it is characterised in that the source mobile management entity sends the address information to be included to the gateway/packet data gateway： After the source mobile management entity receives SRVCC handover request ack messages and before the source mobile management entity receives the information that the Radio Link switching is completed, the source mobile management entity sends load creating request message to the gateway/packet data gateway, and the load creating request message includes the address information of the source Mobile Switching Center Server/WMG；Wherein, according to the load creating request message, gateway/the grouped data network gateway sets up the carrying with the source Mobile Switching Center Server/WMG, and keeps the carrying between the access network of the gateway/grouped data network gateway and second network.18th, a kind of method of SRVCC switchings, it is characterised in that including：In Radio Link handoff procedure, the circuit connection set up between target Mobile Switching Center Server/WMG in source WMG and the first network in first network；Source Mobile Switching Center Server in the first network starts the domain transfer process in SRVCC switchings；Wherein, the domain transfer process being electrically connected in SRVCC switchings transmits the Voice traffic data in the SRVCC handoff procedures before completing, pass through the source WMG when between Voice traffic data grouped data network gateway in the second network and gateway.19th, method as claimed in claim 18, it is characterised in that the Voice traffic data that the domain transfer process being electrically connected in SRVCC switchings is transmitted in the SRVCC handoff procedures before completing includes：The source WMG receives the renewal connection instruction message that the source Mobile Switching Center Server is sent；Connection instruction message, the circuit connection transmission Voice traffic data are updated according to described；Wherein, the connection instruction message that updates includes up parameter and downstream parameter.20th, method as claimed in claim 19, it is characterised in thatThe up parameter includes the IP address information and Tunnel End Point Identifier information of the grouped data network gateway, and the downstream parameter includes the IP address information and Tunnel End Point Identifier information of the gateway；Or, The up parameter includes the IP address information and port information of the grouped data network gateway, and the downstream parameter includes the IP address information and port information of the gateway；Or,The up parameter includes the IP address information and port information and Tunnel End Point Identifier information of the grouped data network gateway, and the downstream parameter includes the IP address information and port information and Tunnel End Point Identifier information of the gateway.21st, a kind of WMG, it is characterised in that in first network, including：First processing module, for terminal set up from the Radio Link handoff procedure of the second network to first network and the second network in gateway/packet data gateway carrying；Second processing module, the information for being switched to the first network according to the terminal known in the Radio Link handoff procedure starts the domain transfer process in SRVCC switchings；3rd processing module, for transmitting the Voice traffic data from the terminal in the carrying that the first processing module is set up to the gateway/packet data gateway before the domain transfer process that the Second processing module starts is completed.22nd, WMG as claimed in claim 21, it is characterised in that also include：Fourth processing module, for receiving comprising the message for setting up the parameter of the carrying and the information of voice coding list, the parameter for setting up the carrying includes the address information of the gateway/packet data gateway.23rd, a kind of gateway, it is characterised in that in the second network, including：5th processing module, during carrying out SRVCC switchings in terminal, sets up the carrying with source Mobile Switching Center Server/WMG in the first network；6th processing module, for transmission to be sent to the Voice traffic data of the terminal to the source Mobile Switching Center Server/WMG in the carrying that the 5th processing module is set up before the domain transfer process during SRVCC switchings is completed.24th, gateway as claimed in claim 23, it is characterised in that also include：Information receiving module, the information for receiving the parameter that the carrying is set up comprising the 5th processing module, the information of the parameter for setting up the carrying includes the source Mobile Switching Center Server/media The address information of gateway.25th, gateway as claimed in claim 24, it is characterised in thatDescribed information receiving module is additionally operable to receive bearer update request message, the bearer update request message includes the information of the parameter for setting up the carrying, and the information of the parameter for setting up the carrying includes the address information that the source Mobile Switching Center Server/WMG is sent to the source Mobile Switching Center Server/WMG of the source mobile management entity；5th processing module is additionally operable to according to bearer update request message foundation and the carrying of source Mobile Switching Center Server/WMG replace the carrying between the gateway/grouped data network gateway and the access network of second network.26th, gateway as claimed in claim 24, it is characterised in thatDescribed information receiving module is additionally operable to receive load creating request message, the load creating request message includes the information of the parameter for setting up the carrying, and the information of the parameter for setting up the carrying includes the address information that the source Mobile Switching Center Server/WMG is sent to the source Mobile Switching Center Server/WMG of the source mobile management entity；5th processing module is additionally operable to the carrying according to load creating request message foundation and the source Mobile Switching Center Server/WMG, and keeps the carrying between the access network of the gateway/grouped data network gateway and second network.26th, a kind of WMG, it is characterised in that including：8th processing module, in Radio Link handoff procedure, the circuit between target Mobile Switching Center Server/WMG in foundation and first network to be connected；9th processing module, domain transfer process in for switching in SRVCC transmit the SRVCC handoff procedures in the circuit connection that the 8th processing module is set up before completing in Voice traffic data, pass through the WMG when between Voice traffic data grouped data network gateway in the second network and gateway.27th, WMG as claimed in claim 26, it is characterised in that also include：Tenth processing module, the source Mobile Switching Center Server for receiving in the first network is sent Renewal connection indicate message, renewal connection indicates that message includes up parameter and downstream parameter；9th processing module is used for the instruction of the renewal connection instruction message received according to the tenth processing module, the Voice traffic data in transmitting the SRVCC handoff procedures in the circuit connection that the 8th processing module is set up.28th, a kind of mobile management entity, it is characterised in that including：Transmitting element, for from the Radio Link handoff procedure of the second network to first network, sending the information of the parameter comprising foundation carrying and/or voice coding list in terminal to source Mobile Switching Center Server/WMG in the first network；Wherein, the parameter includes the address information of gateway/packet data gateway in second network, source Mobile Switching Center Server/the WMG sets up the carrying with the gateway/packet data gateway according to the parameter, and domain transfer process of the source Mobile Switching Center Server/WMG in SRVCC switching flows uses the Voice traffic data of the carrying transmission from the terminal to the gateway/packet data gateway before completing.29th, mobile management entity as claimed in claim 28, it is characterised in thatThe address information of the gateway/packet data gateway is the IP address information and Tunnel End Point Identifier information of the gateway/packet data gateway；Or,The address information of the gateway/packet data gateway is the IP address information and port information of the gateway/packet data gateway.30th, mobile management entity as claimed in claim 28, it is characterised in that also include：Receiving unit；After the information that the transmitting element sends the parameter for setting up carrying and voice coding list, the receiving unit receives the SRVCC handover request ack messages that the source Mobile Switching Center Server/WMG is returned, and the SRVCC handover request ack messages include the information and source Mobile Switching Center Server/WMG of the voice coding modes for the terminal support that the source Mobile Switching Center Server/WMG is selected in the voice coding list to set up the address information of the source Mobile Switching Center Server/WMG determined by carrying；Before domain transfer process completion, the transmitting element be additionally operable to send the address information to Gateway/the packet data gateway；Wherein, gateway/the packet data gateway sets up the carrying with the source Mobile Switching Center Server/WMG according to the information of the address, and the gateway/packet data gateway is sent to the Voice traffic data of the terminal to the source Mobile Switching Center Server/WMG before domain transfer process completion using the carrying transmission.31st, mobile management entity as claimed in claim 30, it is characterised in thatThe transmitting element is additionally operable to after the source mobile management entity receives the information that the Radio Link switching is completed and before domain transfer process completion, bearer update request message is sent to the gateway/packet data gateway, the bearer update request message includes the address information；Wherein, according to the bearer update request message, the gateway/grouped data network gateway and source Mobile Switching Center Server/WMG set up carrying of the carrying to replace between the gateway/grouped data network gateway and the access network of second network.32nd, mobile management entity as claimed in claim 30, it is characterised in thatThe transmitting element is additionally operable to after the source mobile management entity receives SRVCC handover request ack messages and before the source mobile management entity receives the information that the Radio Link switching is completed, load creating request message is sent to the gateway/packet data gateway, the load creating request message includes the address information；Wherein, according to the load creating request message, gateway/the grouped data network gateway sets up the carrying with the source Mobile Switching Center Server/WMG, and keeps the carrying between the access network of the gateway/grouped data network gateway and second network.33rd, a kind of network system, it is characterised in that including：WMG as described in any one of claim 21 to 22 and the gateway as any one of claim 23 to 25.34th, network system as claimed in claim 33, it is characterised in that also include：Mobile management entity as any one of claim 28 to 32.35th, a kind of network system, it is characterised in that including：WMG as described in any in claim 26 to 27.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2009/071716 WO2010127511A1 (en) | 2009-05-08 | 2009-05-08 | Method, device and system for srvcc switching and its data transmission |
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| CN101978727A true CN101978727A (en) | 2011-02-16 |
| CN101978727B CN101978727B (en) | 2013-04-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN200980109074.6A Active CN101978727B (en) | 2009-05-08 | 2009-05-08 | Single receiver voice continuous switching and data transmission method, device and system |
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| CN (1) | CN101978727B (en) |
| WO (1) | WO2010127511A1 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104221429A (en) * | 2012-04-17 | 2014-12-17 | 瑞典爱立信有限公司 | Srvcc handover of calls between access networks with active codec selection |
| CN104641718A (en) * | 2012-09-14 | 2015-05-20 | 交互数字专利控股公司 | System enhancements for enabling non-3GPP offload in 3GPP |
| CN106797374A (en) * | 2014-09-05 | 2017-05-31 | 英特尔公司 | Transcoding during single wireless voice calling continuity (SRVCC) is avoided |
| CN106998540A (en) * | 2016-01-22 | 2017-08-01 | 中国移动通信集团公司 | The switching method of urgent call, system and promptly access handover (mih) functions |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106332306A (en) * | 2015-06-30 | 2017-01-11 | 中兴通讯股份有限公司 | Bearer establishment method and apparatus, media gateway and voice bearer establishment system |
| CN107529200B (en) * | 2016-06-21 | 2021-02-23 | 中兴通讯股份有限公司 | Method and device for releasing resources after network switching of terminal in VoLTE (Voice over Long term evolution) |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8873540B2 (en) * | 2005-03-17 | 2014-10-28 | Ericsson Ab | Circuit-switched and multimedia subsystem voice continuity |
| GB0707387D0 (en) * | 2007-04-17 | 2007-05-23 | Lucent Technologies Inc | Single radio VCC:LTE-VMSC anchor solution |
| CN101291454A (en) * | 2007-04-17 | 2008-10-22 | 华为技术有限公司 | Method implementing voice conversation, voice continuity and communication system |
-
2009
- 2009-05-08 CN CN200980109074.6A patent/CN101978727B/en active Active
- 2009-05-08 WO PCT/CN2009/071716 patent/WO2010127511A1/en active Application Filing
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|---|---|---|---|---|
| CN104221429A (en) * | 2012-04-17 | 2014-12-17 | 瑞典爱立信有限公司 | Srvcc handover of calls between access networks with active codec selection |
| CN104221429B (en) * | 2012-04-17 | 2019-04-05 | 瑞典爱立信有限公司 | Switched using the SRVCC for enlivening calling of the codec selection between access net |
| US11496449B2 (en) | 2012-09-14 | 2022-11-08 | Interdigital Patent Holdings, Inc. | System enhancements for enabling non-3GPP offload in 3GPP |
| CN104641718A (en) * | 2012-09-14 | 2015-05-20 | 交互数字专利控股公司 | System enhancements for enabling non-3GPP offload in 3GPP |
| CN104641718B (en) * | 2012-09-14 | 2019-07-30 | 交互数字专利控股公司 | For enabling the system enhancing of non-3 gpp unloading in 3 gpp |
| CN110337151A (en) * | 2012-09-14 | 2019-10-15 | 交互数字专利控股公司 | For enabling the system enhancing of non-3 gpp unloading in 3 gpp |
| US10581813B2 (en) | 2012-09-14 | 2020-03-03 | Interdigital Patent Holdings, Inc. | System enhancements for enabling non-3GPP offload in 3GPP |
| CN110337151B (en) * | 2012-09-14 | 2023-09-08 | 交互数字专利控股公司 | System enhancements for enabling non-3 GPP offloading in 3GPP |
| CN106797374A (en) * | 2014-09-05 | 2017-05-31 | 英特尔公司 | Transcoding during single wireless voice calling continuity (SRVCC) is avoided |
| US10609605B2 (en) | 2014-09-05 | 2020-03-31 | Intel Corporation | Transcoding avoidance during single radio voice call continuity (SRVCC) |
| CN106797374B (en) * | 2014-09-05 | 2020-11-24 | 英特尔公司 | Transcoding avoidance during Single Radio Voice Call Continuity (SRVCC) |
| US11178582B2 (en) | 2014-09-05 | 2021-11-16 | Intel Corporation | Transcoding avoidance during single radio voice call continuity (SRVCC) |
| CN106998540A (en) * | 2016-01-22 | 2017-08-01 | 中国移动通信集团公司 | The switching method of urgent call, system and promptly access handover (mih) functions |
| CN106998540B (en) * | 2016-01-22 | 2020-09-08 | 中国移动通信集团公司 | Emergency call switching method, system and emergency access switching functional entity |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101978727B (en) | 2013-04-24 |
| WO2010127511A1 (en) | 2010-11-11 |
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