CN101472316A

CN101472316A - Method for implementing voice call succession, interconnection functional entity and terminal equipment

Info

Publication number: CN101472316A
Application number: CNA2007100330478A
Authority: CN
Inventors: 吴晓波; 段小琴; 张戬; 李庆禹; 国炜; 朱文若
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2007-12-29
Filing date: 2007-12-29
Publication date: 2009-07-01
Anticipated expiration: 2027-12-29
Also published as: WO2009092260A1; CN101472316B

Abstract

The embodiment of the invention discloses a method for realizing voice calling continuity, an entity serving an interworking function and a terminal device, wherein, the method for realizing voice calling continuity comprises the following steps: The access of an IP network is achieved through the entity with the interworking function when a user is located under CS network; and CS voice conversation of the user, which is based on the voice load of IP network, is linked on core network bearer of the CS voice conversation of the user through the entity with an interworking function. The embodiment of the invention has the advantages that the voice calling continuity from the CS network to the IP network can be realized through the switching of the voice calling continuity of a single receiver.

Description

Realize method, interconnection functional entity and the terminal equipment of continuous voice call

Technical field

The present invention relates to moving communicating field, relate in particular to a kind of method, interconnection functional entity and terminal equipment of realizing continuous voice call.

Background technology

(Universal Mobile Telecommunications System is the 3-G (Generation Three mobile communication system) that adopts the WCDMA air interface technologies UMTS) to universal mobile telecommunications system, also the UMTS system is called the WCDMA communication system usually.The UMTS system has adopted and the similar structure of second generation mobile communication system, comprise Radio Access Network (Radio Access Network, RAN) and core network (CoreNetwork, CN).Wherein Radio Access Network is used to handle all and wireless function associated, and CN handles functions such as customer location management in the UMTS system, service management and the exchange of realization and external network and routing function.CN from be divided in logic circuit commutative field (Circuit Switched Domain, CS) and packet-switched domain (Packet Switched Domain, PS).(User Equipment UE) has constituted whole UMTS system together for UTRAN (Universal Terrestrial RadioAccess Network Universal Terrestrial Radio Access Network), CN and subscriber equipment.

In order to improve systematic function, system's architecture evolution (SystemArchitecture Evolution, project SAE) are being carried out in the world at present.The framework of this system as shown in Figure 1.Among Fig. 1, UE is subscriber equipment, i.e. terminal; EUTRAN is the wireless access network of evolution, and the Node B of evolution is wherein arranged, and is called ENB, may also have other nodes, and we replace these nodes with ENB.MME (MobilityManagement Entity) is a Mobility Management Entity, has the chain of command function, as with the chain of command Message Processing of UE, mobile management (record UE positional information), paging, authentication etc.Serving SAE Gateway, gateway has user plane functions, transmits the data of UE, has S1-U interface with wireless access network.The similar altogether traditional SGSN of MME and gateway (Serving GPRS Support Node, Serving GPRS Support Node).PDN SAE Gateway, PDN (Packet Data Network, Packet Data Network) gateway, similar traditional GGSN (Gateway GPRS Support Node, gateway GPRS), there is the SGi interface, has functions such as strategy execution, packet filtering with outer data network.PCRF (Policy Control andCharging Rules Function) is policy control and charging regulation function entity, the implementation strategy controlled function of being correlated with.The S3 interface is the interface between the SGSN of MME and 2G/3G, and it is based on the GTP agreement, and S4 is the interface of gateway and SGSN.Gateway may be in same physical node with PDN Gateway also may be in different physical nodes.MME and gateway also may be same physical node or the physical node that separates.When top logic entity is in same node, then the interface signaling between it transfers internal node message to.

SAE/LTE is defined as a pure packet switching system, and this just shows that speech business can only be transmitted in this system in the carrying of packet switch.In the SAE/LTE system, the speech business data are generally controlled by IMS, so speech business is generally known as the VoIP speech business in SAE/LTE.And for traditional speech business, generally all be to be carried on the CS TDM (Time Division Multiplexing, time division multiplexing).SAE/LTE is that focus covers in the deployment of starting stage, and the GSM/UMTS network can be regarded a kind of all standing as to a certain extent.Obvious this network topology structure is brought a problem: when UE when 2G/3G CS network moves into SAE/LTE network hotspot coverage, the speech business based on IMS of SAE/LTE need seamlessly be transferred in voice on the carrying 2G/3G CS network, promptly keeps voice continuity.

Continuous voice call (Voice Call Continuity, VCC) generally be meant, when UE is supporting VoIP (Voice Over IP, use the IP transferring voice) professional network and not supporting between the network of VoIP business when mobile, it is continuous that the speech business of this UE must keep, the speech business that is about to be carried on the VoIP of origin system takes over seamlessly goal systems CS territory, and vice versa.Fig. 2 is the scheme principle schematic that existing employing Dual Radio (Dual Radio is meant generally that between 3GPP and Non-3GPP UE puts at one time and can accept two kinds of wireless signals simultaneously) realizes continuous voice call.

As shown in Figure 2, if UE A initiates audio call in the CS territory, this CS audio call is anchored at VCCAS (Voice Call Continuity Application Server VCC application server).Cover when UE A will move out the CS network and enter wlan network, UE A initiates an IMS audio call by wlan network and this IMS audio call also is anchored on the VCC AS.After this IMS audio call is set up, CS signaling between UE A and the VCC AS and voice bearer by the IMS signaling between UE A and the VCC AS with and attached VoIP carrying replace.Realized that from the continuous voice call of CS network to IMS network still, this scheme only is applicable between Wi-Fi network and the GERAN voice continuity problem under Dual Radio condition.Along with SAE/LTE, wireless broad band technology such as WIMAX occur, be necessary to consider solution from the seamless switching under Single Radio (Single Radio refers generally in 3GPP inside, and UE can only accept a kind of 3GPP wireless signal at a time point) situation between SAE/LTE, WIMAX and the cellular network.

Summary of the invention

Embodiment of the invention technical problem to be solved is, method, interconnection functional entity and the terminal equipment of the borderline region of method, user's perception CS network and the IP network that provide the method that realizes continuous voice call, realizes CS and PS business continuance can switch the continuous voice call of realization from the CS network to IP network by the single-receiver continuous voice call.

A kind of method that realizes continuous voice call that the embodiment of the invention provides from the CS network to IP network, this method comprises:

When the user was in the CS network, described user inserted IP network by interconnection functional entity;

Described interconnection functional entity is associated with described user in described user's the core net carrying of CS voice conversation based on the CS voice conversation of the voice bearer of described IP network.

Accordingly, the another kind that the embodiment of the invention provides is realized the method for continuous voice call, and this method comprises:

When the user was in described CS network, described user inserted described IP network by interconnection functional entity;

Described user initiates that continuous voice call switches and described interconnection functional entity is initiated switching based on described IP network, the IMS voice conversation that described user is switched in described IP network at the CS of described CS network voice conversation;

Described user inserts described IP network.

Want to answer that the embodiment of the invention provides the method for a kind of CS of realization and PS business continuance, this method comprises:

When the user was in the network of supporting CS and PS, described user inserted IP network by interconnection functional entity;

Described user initiates continuous voice call switching and the professional switching of PS, and described interconnection functional entity initiates the switching based on described IP network, the IMS voice conversation that described user is switched in described IP network at the CS of described CS network voice conversation and described user switched to described user in the PS of described IP network business in the PS of described CS network business;

Described user inserts described IP network.

Accordingly, the embodiment of the invention provides the method for the borderline region of a kind of user's perception CS network and IP network, and this method comprises:

When described user when the base station controller of described CS network receives the network identification information of described IP network, be judged to be the borderline region that described user enters described CS network and described IP network;

Or receive when being used to indicate described user to enter the indication information of borderline region of described CS network and described IP network from the base station controller of described CS network as described user, be judged to be the borderline region that described user enters CS network and described IP network.

Accordingly, the embodiment of the invention provides a kind of interconnection functional entity, and this interconnection functional entity comprises:

Access unit is used for when the user is in the CS network described user being inserted IP network;

Associative cell is used for described user is associated with based on the CS voice conversation of the voice bearer of described IP network the core net carrying of described user's CS voice conversation.

Accordingly, the embodiment of the invention provides another kind of interconnection functional entity, and this interconnection functional entity comprises:

Switch unit, be used to receive described Client-initiated continuous voice call handoff request, the switching and the call continuity that trigger and carry out based on described IP network switch, the IMS voice conversation that described user is switched in described IP network at the CS of described CS network voice conversation.

Access unit is used for when the user is in the network of supporting CS and PS described user being inserted IP network;

Switch unit, be used to receive the professional handoff request of described Client-initiated continuous voice call handoff request and PS, trigger and carry out based on the switching of described IP network and call continuity switches and PS is professional switches, the IMS voice conversation that described user is switched in described IP network at the CS of described CS network voice conversation and described user switched to described user in the PS of described IP network business in the PS of described CS network business.

Accordingly, the embodiment of the invention provides a kind of terminal equipment, and this terminal equipment comprises:

The registration support unit is used for setting up logical channel with interconnection functional entity, to register in described goal systems by described interconnection functional entity;

Switch unit, be used for described registration support unit by described interconnection functional entity after described goal systems is finished registration, initiate the single-receiver continuous voice call and switch, described terminal is switched to the voice conversation of described goal systems at the voice conversation of described origin system.

The subscriber equipment of the embodiment of the invention sends the signaling (for example registration, traffic signaling) of goal systems by interconnection functional entity, thereby simulate of the behavior of described subscriber equipment, realized switching the purpose that realizes continuous voice call from the CS network to IP network by the single-receiver continuous voice call in goal systems.

Description of drawings

Fig. 1 is a kind of embodiment schematic diagram of the system architecture of System Architecture Evolution network;

Fig. 2 is that Fig. 2 is the scheme principle schematic that existing employing Dual Radio realizes continuous voice call;

Fig. 3 includes a kind of embodiment schematic diagram that interconnecting function is the network architecture of entity;

Fig. 4 is the network architecture schematic diagram with the direct-connected USSD of foundation passage of HLR;

Fig. 5 is the network architecture schematic diagram with the direct-connected USSD of foundation passage of MSC;

Fig. 6 is that the example structure of the IWF among Fig. 3 is formed schematic diagram;

Fig. 7 is that another example structure of the IWF among Fig. 3 is formed schematic diagram;

Fig. 8 is that another example structure of the IWF among Fig. 3 is formed schematic diagram;

Fig. 8 .a is that the example structure of the UE among Fig. 3 is formed schematic diagram;

Fig. 9 is based on the embodiment schematic flow sheet of method of the realization continuous voice call of the present invention of interconnection functional entity shown in Figure 6;

Figure 10 is based on the embodiment schematic flow sheet of method of the realization continuous voice call of the present invention of interconnection functional entity shown in Figure 7;

Figure 11 is based on the embodiment schematic flow sheet of method of the realization continuous voice call of the present invention of interconnection functional entity shown in Figure 8;

Figure 12 to Figure 15 is that origin system is 2G (GSM), and goal systems is the method schematic diagram of realizing under the network architecture of SAE/LTE from origin system CS territory audio call to goal systems IMS territory continuous voice call;

Figure 16 gets back to the method part schematic diagram of the IMS territory audio call of 2G network to CS territory continuous voice call from the SAE/LTE system;

Figure 17 is that origin system is that 2G or 3G (support double-transmission mode, be that origin system had both been supported the CS business, support IP operation again), goal systems is to realize the part schematic diagram of the method from origin system CS territory audio call to goal systems IMS territory continuous voice call under the network architecture of SAE/LTE;

The origin system that Figure 18 to Figure 19 is based on Bi-casting (two broadcasting) is 2G (not supporting double-transmission mode), and goal systems is to realize the part schematic diagram of the method for continuous voice call under the network architecture of SAE/LTE;

Figure 20 is that origin system is 2G, and goal systems is to realize the part schematic flow sheet of another embodiment of the method for continuous voice call under the network architecture of SAE/LTE;

Figure 21 origin system is that 2G (supports double-transmission mode, be that origin system had both been supported the CS business, support IP operation again) or 3G, goal systems is to realize the idiographic flow schematic diagram of the method from origin system CS territory audio call to goal systems IMS territory continuous voice call under the network architecture of SAE/LTE;

Figure 22 is that origin system is that 2G (supports double-transmission mode, be that origin system had both been supported the CS business, support IP operation again) or 3G, goal systems is to realize the idiographic flow schematic diagram of the method from goal systems IMS territory audio call to origin system CS territory continuous voice call under the network architecture of SAE/LTE.

Embodiment

For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with accompanying drawing.

Fig. 3 is a kind of interconnection functional entity (Interworking Function, network architecture schematic diagram IWF) of including.As shown in Figure 3, this network comprises origin system, goal systems and interconnection functional entity.In the specific implementation, described origin system can be gsm system, WCDMA system, LTE system, WIMAX system and 3GPP2 system etc.; Described goal systems can be 3GPP2 DO system, 3GPP2 1XRTT system, UMB system, SAE/LTE system, WIMAX system etc.; In the specific implementation, UE is established to the logical channel UP ' interface of IWF based on origin system.UE passes through the signaling (for example registration, traffic signaling) that UP ' interface sends goal systems, thereby simulation UE is in the behavior of goal systems.

In the specific implementation, UP ' interface can be based on the IP bearing system of origin system, also can be based on the signaling level message of origin system (for example based on GSM USSD message, 2G/3G short message, 2G/3G/LTE NAS (None Access Stratum, non-access layer information) control messages.As shown in Figure 3, when origin system was gsm system, UE was established to the logical channel UP ' interface of IWF based on the USSD passage of origin system GSM.And then realizing the signaling (for example registration, traffic signaling) of UE by UP ' the interface transmission goal systems (systems such as 3GPP2 DO system, 3GPP2 1XRTT system, UWB system, SAE/LTE system, WIMAX system) of USSD passage foundation, simulation UE is in the behavior of goal systems.UE and IWF directly adopt the ICCP based on USSD (IMS Control Channel Protocol IMS control channel agreement) of similar ICS (IMS Centralized System IMS centralized control system).

USSD (Unstructured Supplementary Service Data unstructured supplementary data traffic) is a kind of novel interactive sessions data service based on the GSM mobile communications network, is the another novel value-added service of releasing on the GSM mobile communications network continue after the short message service.USSD is a kind of novel interactive data service based on the GSM network.What the USSD system adopted is towards connection, and the interactive session mode of transparent channel is provided, and is the ideal carrier of session service, has that response speed is fast, interaction capabilities strong, high reliability features, supports most of common GSM mobile handset simultaneously.The form that USSD initiates: #SC*SI#, wherein, SC is a service code, is made up of the numeral of 0-9, SI is a business information, can be arbitrary content.The # of front is leading character (Leader Char), can by (*, 1-3 bit combination #) forms, the # of back is that end mark (Close Char) is such as * 125#.Its framework has dual mode: with the direct-connected mode of HLR and with the direct-connected mode of MSC, Fig. 4 is the network architecture schematic diagram with the direct-connected USSD of foundation passage of HLR.As shown in Figure 4, under USSD center and situation that HLR docks, will send USSD message to the HLR that MS belonged to when the USSD center issues, be transmitted to the MSC at this MS place, thereby provide USSD service for the USSD user that this HLR covered by HLR; MS is last when sending out, and USSD message arrives HLR via MSC, and HLR passes to the USSD center with it then, transmits USSD message by the USSD center and handles for corresponding service processing module (such as UssdServer, the Ussd server).Fig. 5 is the network architecture schematic diagram with the direct-connected USSD of foundation passage of MSC.As shown in Figure 5, under USSD center and situation that MSC docks, will send USSD message to the MSC at MS place when the USSD center issues, realize the whole network USSD user's automatic roaming (MSC at MS place must support the USSD function); MS is last when sending out, and USSD message will arrive the USSD center via MSC, be transmitted to the corresponding service processing module by the USSD center and handle, and this moment, the USSD center was as the Ussd Handler (USSD processing center) of MSC.In addition, in the specific implementation, in order to improve the speed of UP ' interface command transmitting, UE and IWF pass through UP ' interface negotiation and enable compression function.

In the specific implementation, IWF can link to each other by Radius/Diameter and AAA (AutenticationAuthorization Accounting, authentication and authorization charging server) server.When goal systems was 3GPP2 DO network, IWF contained 3GPP DO and inserts the side entity function, and the interface of IWF and PDSN is A10/A11, and IWF and PCF interface are A8/A9/ (A14)/(A20).When goal systems was the 3GPP2 1XRTT network, IWF contained 3GPP2 1XRTT and inserts the side entity function, and the interface of IWF and 1XRTT MSC is A1.When goal systems was the UMB network, IWF contained UMB network insertion side entity function, and IWF and AGW interface are U1, and IWF and SRNC interface are U2, and IWF and eBS interface are U1.When goal systems was the SAE/LTE network, IWF contained SAE/LTE network insertion side eNodeB function, and IWF and MME interface are S1-MME, and IWF and Serving GW interface are S1-U.If IWF contains the SGSN/MME functional entity, correspondingly, IWF and MME have the S3/S10 interface.Perhaps the interface between IWF and the MME is S3 ', and when switching from the SAE/LTE network to the 2G/3G network, all switching message are all passed through IWF, and IWF is always on the path of S3 interface.When switching from the 2G/3G network to the SAE/LTE network, all switching message are all passed through IWF, and IWF is always on the path of S3 interface.When goal systems was the WIMAX network, IWF contained WIMAX network insertion side BS function, and IWF and ASN-GW interface are R4/R6.And, as the IWF of logical functional entity, can be carried on the actual physical equipment (such as, on the equipment such as MSC/SGSN/MME/ASN-GW).

Concrete, Fig. 6 is that the example structure of the IWF among Fig. 3 is formed schematic diagram, as shown in Figure 6, the IWF of present embodiment comprises access unit 40 and associative cell 50, and further, described access unit 40 comprises receiving element 401, agent unit 402, carries and set up unit 403 and access subunit 404, further, described access subunit 404 comprises identifying unit 4041 and switch unit 4042, wherein

Described receiving element 401 be used to receive the signaling message that described UE sends (such as, register requirement, service request etc.), the logical channel of described signaling message by setting up between described UE and this IWF (such as, when origin system is the GSM network, when goal systems is SAE/LTE, between UE and IWF based on the USSD passage) send to this IWF;

Described agent unit 402 is used for acting on behalf of described user registered and consulted voice bearer data from described IP network to described IP network according to the signaling message that described receiving element 401 receives;

Described carrying is set up unit 403 and is used for negotiation result according to described agent unit 402, sets up voice bearer with described IP network; After described IWF and IP network were set up voice bearer, UE can insert the transmission that described IWF carries out the IP network signaling.

Described identifying unit 4041 is used to judge that the voice that whether need carry out from described CS network to described IP network switch; In the specific implementation, when the mobile switching centre in the described CS network detects the voice switching that need carry out from described CS network to described IP network, notify described interconnection functional entity; Or when the base station controller in the described CS network detects the voice switching that need carry out from described CS network to described IP network, notifying described user, described user notifies described interconnection functional entity by described unstructured supplementary data traffic logical channel; Or described user notifies described interconnection functional entity with the metrical information of described IP network by described unstructured supplementary data traffic logical channel, determines whether that by described interconnection functional entity the voice that need carry out from described CS network to described IP network switch; 4041 notification messages that send according to the notification message or the described base station controller of the transmission of described mobile switching centre of this identifying unit, perhaps the information that sends according to terminal is measured goal systems, switches to determine whether the voice that need carry out from described CS network to described IP network.

Described switch unit 4042 is used for when described identifying unit judges that definite voice that need carry out from described CS network to described IP network switch, trigger and carry out switching, the voice bearer on the described interconnection functional entity is switched on the respective carrier network equipment of described IP network based on described IP network.Such as, when origin system is the GSM network, when goal systems is the SAE/LTE network, IWF can trigger corresponding inter-eNB and switch (if target LTE sub-district belongs to different MME, then triggering inter-MME switches), the voice bearer on the described interconnection functional entity is switched on the actual bearer equipment eNB and MME of target SAE/LTE network.

Described associative cell 50 is used for described user is associated with based on the CS voice conversation of the voice bearer of described IP network the core net carrying of described user's CS voice conversation.Such as, when origin system is the GSM network, when goal systems was the SAE/LTE network, associative cell 50 can be associated with described user's CS voice conversation on the CS server is net loaded based on the eNB of SAE/LTE network and the CS voice conversation on the MME with UE.So far, successfully UE is switched to the access bearer of IP based network based on the access bearer of CS network, follow-uply switch the IMS voice conversation that described user's CS voice conversation can be switched in described IP network when UE initiates continuous voice call.

Accordingly, Fig. 7 is that another example structure of the IWF among Fig. 3 is formed schematic diagram, as shown in Figure 7, the IWF of present embodiment comprises access unit 51 and switch unit 52, further described access unit 51 comprises first receiving element 510 and agent unit 511, described switch unit 52 comprises second receiving element 520, memory cell 521, first switch unit 522 and second switch unit 523, further described first switch unit 522 comprises that identifying unit 5220 and first switches subelement 5221, wherein

Described first receiving element 510 is used to receive the signaling message that described user sends, and described signaling message sends to this interconnection functional entity by the logical channel of setting up between described user and this interconnection functional entity;

Described agent unit 511 is used for acting on behalf of described user to described IP network registration and to the IMS network registry according to the signaling message that described first receiving element receives.

Described second receiving element 520 is used for reaching behind described IMS network registry in described IP network as described user, receives described Client-initiated continuous voice call handoff request;

Described memory cell 521 is used for the demand signalling that described continuous voice call that described second receiving element 520 of buffer memory receives switches;

Described identifying unit 5220 is used to judge that the voice that whether need carry out from described CS network to described IP network switch, and this identifying unit 5220 is identical with identifying unit 4041 functions among the last embodiment, at this repeated description not;

Described first switches subelement 5221 is used in described triggering and carries out switching based on described IP network, the voice bearer on the described interconnection functional entity is switched on the respective carrier network equipment of described IP network.

Second switch unit 523 is used for triggering and carry out follow-up continuous voice call according to described memory cell 521 stored calls continuity handoff request signalings and switches, the IMS voice conversation that described user is switched in described IP network at the CS of described CS network voice conversation.It is follow-up as long as the user inserts described IP network and can carry out voice conversation by IMS.

Accordingly, Fig. 8 is that another example structure of the IWF among Fig. 3 is formed schematic diagram, and as shown in Figure 8, the IWF of present embodiment comprises access unit 53, switch unit 54 and synchronous control unit 55, wherein,

Described access unit 53 is used for when the user is in the network of supporting CS and PS described user being inserted IP network; In the specific implementation,, need so PS business and the CS business of UE are switched to IP network simultaneously when UE has the professional and CS business of PS simultaneously.

Described switch unit 54 is used to receive described Client-initiated continuous voice call handoff request and the professional handoff request of PS, trigger and carry out based on the switching of described IP network and call continuity switches and PS is professional switches, the IMS voice conversation that described user is switched in described IP network at the CS of described CS network voice conversation and described user switched to described user in the PS of described IP network business in the PS of described CS network business.

Described synchronous control unit 55 is used to control the synchronous switching that described continuous voice call switches and the PS business is switched.

Accordingly, Fig. 8 .a is that the example structure of the UE among Fig. 3 is formed schematic diagram, and shown in Fig. 8 .a, the UE of present embodiment comprises perception unit 600, registration support unit 601 and switch unit 602, wherein,

Described perception unit 600 is used for being positioned at origin system when described terminal, and receive the network identification information of goal systems or receive when being used to indicate described user to enter the indication information of borderline region of described origin system and described goal systems, judge that described terminal use enters the borderline region of described origin system and described goal systems, and with the storage the domain identifier information updating be described network identification information or the indication information of receiving; In the specific implementation, UE A can it enters LTE and 2G borderline region by following several mode perception.1) when UE receives adjacent LTE network of network information (for example LTE cell list, LTE frequency point information) from the BSC of 2G network, thereby judges that it enters the LTE-2G borderline region; 2) on the BSC of LTE-2G borderline region, dispose specific indication, and send to this regional UE by BSC.In the specific implementation, can send to UE by the BSC broadcast channel, perhaps by RRC message informing terminal (Cell Update Confirm cell update acknowledge message for example, Handover to UTRAN Command is to the switching command of UTRAN, Physical Channel Reconfiguration physical channel reallocation message, Radio BearerReconfiguration radio bearer reallocation message, Radio Bearer Release radio bearer release message, Radio Bearer Setup radio bearer is set up message, RRC Connection Setup Radio Link control connection is set up message, Transport Channel Reconfiguration transmission channel reallocation message, message such as MeasurementControl) etc. send corresponding indication information to terminal.Equally, UE A also can leave LTE and 2G borderline region by similar mode perception UE, reenters the 2G network coverage.Concrete perceptive mode can comprise: 1) when UE when the LTE-2G/3G borderline region enters 2G network (being non-LTE-2G borderline region), only receive the 2G network information (for example 2G cell tabulation) from BSC, thereby judge that it has left the LTE-2G/3G borderline region.2) on the BSC of LTE-2G borderline region, dispose specific indication, and send to this regional UE or dispose specific indication at non-LTE-2G borderline region BSC by BSC.In the specific implementation, can send to UE by the BSC broadcast channel, perhaps by RRC message informing terminal (Cell Update Confirm cell update acknowledge message for example, Handover to UTRAN Command is to the switching command of UTRAN, Physical Channel Reconfiguration physical channel reallocation message, RadioBearer Reconfiguration radio bearer reallocation message, Radio Bearer Release radio bearer release message, Radio Bearer Setup radio bearer is set up message, RRC Connection Setup Radio Link control connection is set up message, Transport Channel Reconfiguration transmission channel reallocation message, message such as Measurement Control) etc. send corresponding indication information to terminal.The perhaps only specific indication of configuration on the BSC of LTE-2G borderline region, when UE enters non-LTE-2G borderline region from the LTE-2G borderline region, when UE receives the indication of corresponding territory, then the UE perception its entered non-LTE-2G borderline region.

Described registration support unit 601 is used for setting up logical channel with interconnection functional entity, to register in described goal systems by described interconnection functional entity; In the specific implementation, UE is established to the logical channel UP ' interface of IWF based on origin system.UE passes through the signaling (for example registration, traffic signaling) that UP ' interface sends goal systems, thereby simulation UE is in the behavior of goal systems.In the specific implementation, UP ' interface can be based on the IP bearing system of origin system, also can be based on the signaling level message of origin system (for example based on GSM USSD message, 2G/3G short message, 2G/3G/LTE NAS (None Access Stratum, non-access layer information) control messages.As shown in Figure 3, when origin system was gsm system, UE was established to the logical channel UP ' interface of IWF based on the USSD passage of origin system GSM.And then realizing the signaling (for example registration, traffic signaling) of UE by UP ' the interface transmission goal systems (systems such as 3GPP2 DO system, 3GPP2 1XRTT system, UWB system, SAE/LTE system, WIMAX system) of USSD passage foundation, simulation UE is in the behavior of goal systems.UE and IWF directly adopt the ICCP based on USSD (IMS Control Channel Protocol IMS control channel agreement) of similar ICS (IMS Centralized System IMS centralized control system).

Described switch unit 602 be used for when described perception unit 600 perceive described terminal use enter described origin system and described goal systems borderline region and described registration support unit by described interconnection functional entity after described goal systems is finished registration, initiate the single-receiver continuous voice call and switch, described terminal is switched to the voice conversation of described goal systems at the voice conversation of described origin system.

Accordingly, Fig. 9 is based on the embodiment schematic flow sheet of method of the realization continuous voice call of the present invention of interconnection functional entity shown in Figure 6, and as shown in Figure 9, the method for present embodiment comprises:

Step S100 sets up the user to the logical channel between described interconnection functional entity; In the specific implementation, UE is established to the logical channel UP ' interface of IWF based on origin system.UE passes through the signaling (for example registration, traffic signaling) that UP ' interface sends goal systems, thereby simulation UE is in the behavior of goal systems.In the specific implementation, UP ' interface can be based on the IP bearing system of origin system, also can be based on the signaling level message of origin system (for example based on GSM USSD message, 2G/3G short message, 2G/3G/LTE NAS control messages.

Step S101, described user is mutual based on described logical channel and described interconnection functional entity, registers in described IP network by described interconnection functional entity, consults the voice bearer data of described IP network;

Step S102, described user or described interconnection functional entity trigger described IP network and set up voice bearer according to described negotiation result; In the specific implementation, after setting up voice bearer by IWF, IWF is for objective network virtual target network of network equipment (BSC or MME), is the pseudo-sub-district of CS network for the sub-district of the objective network under the source network IWF service.

Step S103, interconnection functional entity judge that the voice that whether need carry out from described CS network to described IP network switch, and after judging definite need the switching, execution in step S104; Otherwise, finish.In the specific implementation, interconnection functional entity can determine in the following way that the voice that need carry out from described CS network to described IP network switch, such as, when the mobile switching centre in the described CS network detects the voice switching that need carry out from described CS network to described IP network, notify described interconnection functional entity; Or when the base station controller in the described CS network detects the voice switching that need carry out from described CS network to described IP network, notifying described user, described user notifies described interconnection functional entity by described unstructured supplementary data traffic logical channel; Or described user notifies described interconnection functional entity with the metrical information of described IP network by described unstructured supplementary data traffic logical channel, determines whether that by described interconnection functional entity the voice that need carry out from described CS network to described IP network switch;

Step S104, described interconnection functional entity trigger and carry out the switching based on described IP network, the voice bearer on the described interconnection functional entity are switched on the respective carrier network equipment of described IP network; Such as, when origin system is the GSM network, when goal systems is the SAE/LTE network, IWF can trigger corresponding inter-eNB and switch (if target LTE sub-district belongs to different MME, then triggering inter-MME switches), the voice bearer on the described interconnection functional entity is switched on the actual bearer equipment eNB and MME of target SAE/LTE network.

Step S105, described user inserts described IP network.Such as, after finishing the inter-eNB switching, the user transfers to based on the voice bearer of IWF on the true eNB of described IP network, and at this moment, the user inserts described eNB and is accomplished to the access of described IP network.

Step S106, described interconnection functional entity are associated with described user in described user's the core net carrying of CS voice conversation based on the CS voice conversation of the voice bearer of described IP network.Such as, when origin system is the GSM network, when goal systems was the SAE/LTE network, associative cell 50 can be associated with described user's CS voice conversation on the CS server is net loaded based on the eNB of SAE/LTE network and the CS voice conversation on the MME with UE.

Step S107, described user initiate continuous voice call and switch, the IMS voice conversation that described user's CS voice conversation is switched in described IP network.

Certainly in specific implementation, when described user or described interconnection functional entity trigger after described IP network sets up voice bearer according to described negotiation result, described interconnection functional entity provides bearing resource from described IP network to described user is notified described user, concrete, described interconnection functional entity can send to described user with described bearing resource information by described logical channel; Or described interconnection functional entity sends to described user by mobile switching centre and base station controller with described bearing resource information.

Want to answer that Figure 10 is based on the embodiment schematic flow sheet of method of the realization continuous voice call of the present invention of interconnection functional entity shown in Figure 7, as shown in figure 10, the method for present embodiment comprises:

Step S110 sets up described user to logical channel between described interconnection functional entity;

Step S111, described user is mutual based on described logical channel and described interconnection functional entity, reaches at the IMS network registry in described IP network registration by described interconnection functional entity;

Step S112, described user initiate continuous voice call and switch;

Step S113, the described user of described interconnection functional entity buffer memory initiate the signaling that continuous voice call switches;

Step S114, interconnection functional entity judge that the voice that whether need carry out from described CS network to described IP network switch, and after judging definite need the switching, execution in step S115; Otherwise, finish.In the specific implementation, interconnection functional entity can determine in the following way that the voice that need carry out from described CS network to described IP network switch, such as, when the mobile switching centre in the described CS network detects the voice switching that need carry out from described CS network to described IP network, notify described interconnection functional entity; Or when the base station controller in the described CS network detects the voice switching that need carry out from described CS network to described IP network, notifying described user, described user notifies described interconnection functional entity by described unstructured supplementary data traffic logical channel; Or described user notifies described interconnection functional entity with the metrical information of described IP network by described unstructured supplementary data traffic logical channel, determines whether that by described interconnection functional entity the voice that need carry out from described CS network to described IP network switch;

Step S115, described interconnection functional entity triggers the switching based on described IP network, the voice bearer on the described interconnection functional entity is switched on the respective carrier network equipment of described IP network;

Step S116, described interconnection functional entity switches according to the continuous voice call of the continuous voice call hand off signaling triggering following of buffer memory, described user is switched to the IMS voice conversation of described IP network at the CS of described CS network voice conversation.

Step S117, described user inserts described IP network.

Accordingly, Figure 11 is based on the embodiment schematic flow sheet of method of the realization continuous voice call of the present invention of interconnection functional entity shown in Figure 8, and as shown in figure 11, the method for present embodiment comprises:

Step S120, described user inserts IP network by interconnection functional entity;

Step S121, described user initiates continuous voice call switching and the professional switching of PS, and described interconnection functional entity initiates the switching based on described IP network, the IMS voice conversation that described user is switched in described IP network at the CS of described CS network voice conversation and described user switched to described user in the PS of described IP network business in the PS of described CS network business; In the specific implementation, described interconnection functional entity is controlled the synchronous switching of described continuous voice call switching and described PS business.

Step S122, described user inserts described IP network.

Be example with the specific embodiment below, the embodiment of the invention is described in more details.

Figure 12 to Figure 15 is that origin system is 2G (GSM), goal systems is the method schematic diagram of realizing under the network architecture of SAE/LTE from origin system CS territory audio call to goal systems IMS territory continuous voice call, referring to figs 12 to Figure 15, when origin system is the GSM network, UE is established to the logical channel UP ' interface of IWF based on the USSD passage (adopting the direct-connected mode of HLR among the figure) of origin system GSM, when goal systems is the SAE/LTE network, IWF contains SAE/LTE network insertion side eNB (being BSC/eNodeB) function, IWF and MME (Mobility Management Entity, Mobility Management Entity) interface is S1-MME, and IWF and SAE GW interface are S1-U.Realize as follows to the method idiographic flow of goal systems IMS territory continuous voice call based on this network architecture from origin system CS territory audio call:

As shown in figure 12, UE A initiates voice conversation by 2G CS network.If desired this CS audio call is switched to the IMS session based on the IMS network, then this audio call is anchored at VCC AS.It enters LTE and 2G borderline region when UE A perception, and UE is established to the logical channel UP ' interface of IWF based on the USSD passage of origin system.Realize that UE adheres in the LTE territory by IWF.Carry out the LTE registration based on described UP ' interface then, consult the voice bearer data of described LET network, and trigger the network based described negotiation result of described LTE by described UE or described IWF and set up voice bearer (voice bearer of setting up this moment is that IWF is to the voice bearer SAE GW).In the specific implementation, UE is established to the logical channel UP ' interface of IWF based on the USSD passage of origin system, realizes that UE is by any time of IWF after the step of adhering in LTE territory can advance to UE A start.In the specific implementation, UE A can it enters LTE and 2G borderline region by following several mode perception.1) when UE receives adjacent LTE network of network information (for example LTE cell list, LTE frequency point information) from the BSC of 2G network, thereby judges that it enters the LTE-2G borderline region; 2) on the BSC of LTE-2G borderline region, dispose specific indication, and send to this regional UE by BSC.In the specific implementation, can send to UE by the BSC broadcast channel, perhaps by RRC message informing terminal (Cell Update Confirm cell update acknowledge message for example, Handover to UTRAN Command is to the switching command of UTRAN, PhysicalChannel Reconfiguration physical channel reallocation message, Radio Bearer Reconfiguration radio bearer reallocation message, Radio Bearer Release radio bearer release message, Radio Bearer Setup radio bearer is set up message, RRC Connection Setup Radio Link control connection is set up message, TransportChannel Reconfiguration transmission channel reallocation message, message such as Measurement Control) etc. send corresponding indication information to terminal.Equally, UE A also can leave LTE and 2G borderline region by similar mode perception UE, reenters the 2G network coverage.Concrete perceptive mode can comprise: 1) when UE when the LTE-2G/3G borderline region enters 2G network (being non-LTE-2G borderline region), only receive the 2G network information (for example 2G cell tabulation) from BSC, thereby judge that it has left the LTE-2G/3G borderline region.2) on the BSC of LTE-2G borderline region, dispose specific indication, and send to this regional UE or dispose specific indication at non-LTE-2G borderline region BSC by BSC.In the specific implementation, can send to UE by the BSC broadcast channel, perhaps by RRC message informing terminal (Cell Update Confirm cell update acknowledge message for example, Handover to UTRAN Command is to the switching command of UTRAN, Physical ChannelReconfiguration physical channel reallocation message, Radio Bearer Reconfiguration radio bearer reallocation message, Radio Bearer Release radio bearer release message, Radio Bearer Setup radio bearer is set up message, RRC Connection Setup Radio Link control connection is set up message, Transport ChannelReconfiguration transmission channel reallocation message, message such as Measurement Control) etc. send corresponding indication information to terminal.The perhaps only specific indication of configuration on the BSC of LTE-2G borderline region, when UE enters non-LTE-2G borderline region from the LTE-2G borderline region, when UE receives the indication of corresponding territory, then the UE perception its entered non-LTE-2G borderline region.

As shown in figure 13, when UE A continues to move from the 2G network toward the LTE network, then trigger 2G and switch to LTE.IWF at first determine to need triggers 2G-by following several modes〉LTE switches: 1) do corresponding configuration, with 2G-at VMSC (visitedmobile service center, vision location mobile switching centre)〉LTE switches forwards to IWF.Particularly, from the 2G network, LTE sub-district quilt is as serving pseudo-2G cell by IWF (function with goal systems BSC), and the relevant routing iinformation in configuration LTE sub-district on the BSC/MSC of service UE, making that MSC is with 2G-〉(for example inter-BSC switches message for the switching message of LTE, if the BSC of IWF-BSC and UE current service belongs to different MS C, then trigger inter-MSC and switch) can be sent to IWF.2) UE A continues to move from the 2G/3G network toward the LTE network, triggers 2G and switches to LTE, and the BSC of service UE A finds to switch to the SAE/LTE network, and notice UE A (comprising target LTE sub-district ID), UE A pass through UP ' interface notice IWF.3) the UE A measurement report that will contain the LTE relevant information sends to IWF, whether will switch to goal systems SAE/LTE by the IWF decision.For the BSC system of UE A current service, UE can report corresponding measurement report simultaneously.This measurement report can comprise the LTE relevant information, also can not comprise the LTE relevant information.Then IWF triggers based on the switching of described IP network (as shown in Figure 7, IWF triggers IWF and switches to actual eNB and the voice bearer between SAE GW to the voice bearer between SAE GW, IWF is according to the target LTE sub-district of decision, triggering corresponding inter-eNB switches (if target LTE sub-district belongs to different MME, then triggering inter-MME switches), voice bearer on the described interconnection functional entity is switched to the target eNB and the MME of the SAE/LTE network that consults, target eNB is reserved Radio Resource), and described UE is associated with at the voice bearer of described IP network in the core net carrying of CS voice conversation of described UE.And UE is associated with at the voice bearer of described IP network in the core net carrying of CS voice conversation of described UE).IWF also can be with target LTE cell information in the specific implementation, and target eNB information notice UE A.In the specific implementation, IWF can be by any notice UE A in the following dual mode, 1) IWF passes through UP ' interface with the corresponding radio resource information of target eNB and sends to UE.2) IWF is encapsulated in inter-BSC or inter-MSC switching response message with the corresponding radio resource information of target eNB, sends to UE A by VMSC and BSC.

As shown in figure 14, UE A inserts the LTE Target cell, and described IWF is associated with described UE in the core net carrying of CS voice conversation of described UE at the CS of described SAE/LTE network voice bearer, is about to SAE/LTE bearing association among Fig. 8 to the CS media plane.UP ' interface will be from transferring to goal systems SAE/LTE network based on origin system 2G system between UE A and the IWF, and in the specific implementation, the UP ' interface after the transfer can be based on the IP network of SAE/LTE system, also can be based on the NAS message of SAE/LTE network.At this moment, UE A is transferred to the access of the SAE/LTE of based target system network based on the access of 2G network.At this moment, IWF includes the MGW function, and conversion is based on speech coding and the IP-based speech coding of 2G CS.Perhaps the IP between IWF and the UE A is carried as IP tunnel (IP logical channel), the speech data that transmits between IWF and the UE A be encoded to speech coding based on 2G CS.

As shown in figure 15, if the UE decision switches to the IMS business platform, then UE triggers Rel-7 VCC DT process (the territory transfer process of Rel-7 Voice Call Continuity Domain Transfer VCC version 7) the IMS business platform is transferred in the described voice of Fig. 8, thereby finishes from CS-〉voice of LTE switch.SAE/LTE carrying shown in this moment is released, and UP ' interface can be released, and also can continue to keep.Here whether UE switches to the IMS business platform according to the strategy decision of himself or network.Particularly, when UE A leaves the 2G-LTE borderline region, enter the LTE network internal, UE initiates above-mentioned VCC process.Judgment condition comprises following two kinds:

1) when UE when the LTE-2G/3G borderline region enters LTE network (being non-LTE-2G borderline region), only receive the LTE network information (for example LTE cell list, LTE frequency point information) from eNodeB, thereby judge that it has left the LTE-2G/3G borderline region.

2) on the eNodeB of LTE-2G borderline region, dispose specific indication, and send to this regional UE, perhaps in the specific indication of non-LTE-2G borderline region eNodeB configuration by eNodeB.In the specific implementation, can send to UE by the eNodeB broadcast channel, perhaps by RRC message informing terminal (CellUpdate Confirm cell update acknowledge message for example, Handover to UTRAN Command is to the switching command of UTRAN, Physical Channel Reconfiguration physical channel reallocation message, Radio BearerReconfiguration radio bearer reallocation message, Radio Bearer Release radio bearer release message, Radio Bearer Setup radio bearer is set up message, RRC Connection Setup Radio Link control connection is set up message, Transport Channel Reconfiguration transmission channel reallocation message, message such as MeasurementControl) etc. send corresponding indication information to terminal.The perhaps only specific indication of configuration on the eNodeB of LTE-2G borderline region, when UE enters non-LTE-2G borderline region from the LTE-2G borderline region, when UE receives the indication of corresponding territory, then the UE perception its entered non-LTE-2G borderline region.

Certainly, in specific implementation, after the user moves into goal systems SAE/LTE, also may come back to origin system 2G network, as shown in figure 16, if UE decision switches to state shown in Figure 14 again, if this moment UE and IWF between UP ' interface do not exist, then UE triggers UP ' interface and rebulids process.And then, UE and IWF negotiating bearer parameter.According to the bearing parameter that consults, IWF triggers the SAE/LTE dedicated bearer by Rx interface and sets up process or UE A initiation SAE/LTE loading establishing process.Then, trigger Rel-7VCCDT process (the territory transfer process of Rel-7 Voice Call Continuity Domain Transfer VCC version 7) and convert the IMS speech business to Figure 14 described speech business, further, can trigger inter-BSC or inter-MSC switching will be based on the described state exchange of Figure 14 to the state based on Figure 12.

Here, whether UE can switch the IMS business according to the strategy decision of himself or network.IWF is to the correlation step among similar Figure 14 of processing of user's face of speech business.In addition, the above-mentioned flow process that Figure 16 is described is equally applicable to initiate the session of an IMS initial speech at SAE/LTE.

In addition, the foundation of USSD logical channel in the above-mentioned flow process, by the USSD logical channel in the SAE/LTE registration process, can occur in UE any one stage after the start of 2G network by USSD logical channel negotiating bearer parameter and at the loading establishing process of SAE/LTE, and be not limited to the time point in the above embodiments.Equally, the USSD logical channel is to be transmitted to IWF then through HLR in the foregoing description, just provide here a kind of may USSD logical channel path, do not limit the path (for example USSD logical channel may directly from VMSC to IWF) of USSD.For example when UE enters the 2G-LTE borderline region, UE sets up the USSD logical channel, in SAE/LTE registration, by USSD logical channel negotiating bearer parameter and set up the SAE/LTE carrying, wait for 2G-by the USSD logical channel then〉arrival of LTE switching time.Especially, in order to dwindle whole C S-〉switching time of LTE, can static mobile phone strategy or dispose corresponding network strategy indication UE after the GSM start, carry out some or all of operation based on the USSD logical channel.

It is WIMAX network, 3GPP2 HRPD network, 3GPP2UMB network and 3GPP2 1XRTT network that present embodiment is equally applicable to goal systems.

Figure 17 is that origin system is that 2G or 3G (support double-transmission mode, be that origin system had both been supported the CS business, support IP operation again), goal systems is to realize the part schematic diagram of the method from origin system CS territory audio call to goal systems IMS territory continuous voice call under the network architecture of SAE/LTE, with reference to Figure 17, flow process under this network architecture and Figure 12 are similar to embodiment shown in Figure 15, difference be following some:

As shown in figure 17,1) for the 2G network, UP ' interface can be based on 2G PS network or 2G NAS layer message; For 3G network, UP ' interface can be based on 3G PS network or 3G NAS layer message.Wherein UE A is different by selected SAE GW in the 2G/3G network attachment process with UE A by IWF selected SAE GW in goal systems SAE/LTE attaching process.

2), need so PS business and the CS business of UE are switched to the SAE/LTE network simultaneously if UE has the professional and CS business of PS simultaneously.At this moment, IWF contains MME or SGSN functional entity, and dispose corresponding data so that 2G/3G is sent to IWF to LTE PS handoff request at the BSC/SGSN of service UE, IWF according to 2G/3G to the PS of LTE switch and the sync bit synchronous 2G/3G of 2G/3G in switching to the CS of LTE to the PS handoff request of LTE and 2G/3G to the CS handoff request of LTE, require the SAE/LTE goal systems to reserve corresponding resource.Simultaneously, IWF generates the CS switching response message of 2G/3G to the PS switching response message of LTE and 2G/3G to LTE, and in described response message the synchronous indicating bit of interpolation, be transmitted to UE by the SGSN/VMSC/BSC that serves this UE then.Here, IWF also can pass through UP ' interface and sends corresponding handoff response to UE.

When goal systems was the WIMAX network, the carrying that UE A passes through UP ' interface, IWF sets up non-voice service at target WIMAX network was responsible for triggering and control 2G/3G-by IWF〉WIMAX handoff procedure (comprising the carrying of voice bearer and non-voice).It is 3GPP2 HRPD network, 3GPP2 UMB network that described process is equally applicable to goal systems.

The origin system that Figure 18 to Figure 19 is based on Bi-casting (two broadcasting) is 2G (not supporting double-transmission mode), and goal systems is to realize the part schematic diagram of the method for continuous voice call under the network architecture of SAE/LTE.

As shown in figure 18, UE A initiates voice conversation by 2G CS network, and this audio call is anchored at VCC AS.It enters the borderline region of LTE network and 2G network when UE A perception, UE A adheres in the LTE territory by IWF, the similar Figure 12 of its attaching process is to embodiment shown in Figure 15, and UE A passes through UP ' interface, IWF and SAE/LTE network and finishes the IMS registration process at the IMS network then.

Further, UE A triggers Rel-7 VCC DT process after finishing the IMS registration process, set up professional control of new IMS and IMS user plane.After Rel-7 VCC DT process is finished, CS control plane and CS user plane based on 2G CS speech business still are held, simultaneously, VCC MGW enables two broadcast (Bi-casting), and promptly VCC MGW sends speech data simultaneously to IMS user plane and CS user plane simultaneously.When UE A moves from the 2G/3G network toward the LTE network, trigger 2G and switch and notice IWF (method and Fig. 6 of notice IWF are similar to embodiment shown in Figure 9) to LTE.IWF triggers the switching based on the LTE network, it is the inter-eNB/inter-MME switching flow among the IWF triggering figure, thereby IWF is switched to the voice bearer of eNB to SAE GW to the voice bearer of SAE GW, and the voice bearer that is about on the IWF switches on the LTE network, and UE A inserts objective network LTE.

Perhaps, as shown in figure 19, at step S1300, UE A continues to move from the 2G/3G network toward the LTE network, triggers switching and the notice IWF (method and Figure 12 of notice IWF to shown in Figure 15 embodiment similar) of 2G to LTE.IWF notice UE A carries out Rel-7 VCC DT process, sets up professional control of new IMS and IMS user plane (being the process of setting up of SAE/LTE voice dedicated bearer).After the IMS user plane was set up successfully, inter-eNB or inter-MME that IWF is triggered to target SAE/LTE switched, and its flow process is identical to embodiment shown in Figure 15 with Figure 12.Its detailed process is as follows:

When IWF receives inter-eNB or inter-MME switching response message, the corresponding message of IWF temporary cache.

When receiving after Rel-7 VCC DT process finishes message (for example UE sends to the ACK message of VCC AS), IWF just transmits inter-eNB or the inter-MME switching response message is given UE (idiographic flow and Figure 12 are similar to embodiment shown in Figure 15), and UE is linked into target SAE/LTE network according to the switching command that receives.

Perhaps UE is after receiving switching command, and UE waits for after Rel-7 VCC DT process is finished and just begins to insert goal systems (for example UE sends to the ACK message of VCC AS).

Perhaps, as shown in figure 18, UE A continues to move from the 2G/3G network toward the LTE network, UE A triggers Rel-7 VCC DT process after finishing registration process, UE A sends invite (VDI) message, wherein VDI is VCC Domain Transfer URI, and the conversion of VCC territory is unified to indicate.The corresponding invite of IWF temporary cache (VDI) message, this moment, the call control timer on the UE was provided in that not receive call (such as 180 Ring/200 OK) not overtime yet.When 2G is triggered to the switching of LTE, and this 2G of IWF perception is to the handoff procedure (method and Figure 12 of notice IWF are similar to embodiment shown in Figure 15) of LTE.IWF carries out Rel-7 VCC DT process immediately, sets up professional control of new IMS and IMS user plane (being the process of setting up of SAE/LTE voice dedicated bearer).And IWF triggers inter-eNB or inter-MME switching that IWF is triggered to target SAE/LTE, and its flow process is identical to embodiment shown in Figure 15 with Figure 12.Its detailed process is as follows:

When receiving after Rel-7 VCC DT process finishes message (for example UE sends to the ACK message of VCC AS), IWF just transmits inter-eNB or the inter-MME switching response message is given UE (idiographic flow and Fig. 6 are similar to embodiment shown in Figure 9), and UE is linked into target SAE/LTE network according to the switching command that receives.

When UE A in the process that moves, cause the variation of IWF owing to the band of position changes, then UE A sends message and indicates it to discharge invite (VDI) to old IWF, and UE A resends invite (VDI) and arrives new IWF.

Said process also is fit to the switching situation of LTE to CS, be that UE A uses IMS network operation speech business at the LTE network, when UE A enters LTE and zone, 2G border, UE A by IWF in 2G CS network registration process, trigger Rel-7 VCC DT process, set up professional control of new CS and CS user plane, its idiographic flow is similar in the present embodiment CS to the handoff procedure of LTE.

Further, origin system based on Bi-casting (two broadcasting) is 2G (a support double-transmission mode), goal systems is to realize under the network architecture of SAE/LTE that the method for continuous voice call can be by doing configuration at source BSC, when taking place 2G to the switching of LTE, source BSC only sends handoff request to source SGSN, and source SGSN does corresponding configuration with 2G-〉LTE PS handoff request sends to IWF-MME/SGSN.IWF is receiving 2G-〉after LTE PS switches message, trigger that inter-MME switches or inter-eNodeB switches (this switchings message comprises 2G-〉LTE PS the non-voice class context and the 2G-that switch〉the voice class context of LTE CS switching).Its subsequent flows journey and embodiment shown in Figure 180 are similar, at this, no longer are described in detail.

Further, Figure 20 is that origin system is 2G, and goal systems is to realize under the network architecture of SAE/LTE that voice contact calls out the part schematic flow sheet of another embodiment of the method for property.As shown in figure 20, after UE A start or UE A need initiate voice conversation, set up the USSD logical channel, by the USSD logical channel in the SAE/LTE registration process, by USSD logical channel IMS registration process, initiate IMS audio call process by the USSD logical channel.In initiating IMS audio call process, IWF distributes CS domain routing number, and passes through UP ' interface and send UE A to.UE A initiates CS audio call process (called number is described CS domain routing number) according to described CS domain routing number.The described CS domain routing number of 2G CS network analysis is to IWF, thereby the CS that sets up from UE A to IWF carries.IWF is responsible for related CS carrying and the carrying of the IP from SAE GW to IWF-eNB from UE A to IWF.Follow-up 2G-〉LTE switching flow and SR-VCC process be similar to Figure 12 to embodiment shown in Figure 15, no longer be described in detail at this.

Same present embodiment is applicable to that origin system is a 3G network, and goal systems is WIMAX network, 3GPP2HRPD network, 3GPP2 UMB network and 3GPP2 1XRTT network.

Figure 21 is that origin system is that 2G (supports double-transmission mode, be that origin system had both been supported the CS business, support IP operation again) or 3G, goal systems is to realize the idiographic flow schematic diagram of an embodiment of the method from origin system CS territory audio call to goal systems IMS territory continuous voice call under the network architecture of SAE/LTE; As shown in figure 21, the method for present embodiment specifically comprises:

Step S1, the SR-VCC preparatory stage:

When UE has the CS of an activity to call out and is in the SR-VCC territory, UE is in the SR-VCC preparatory stage.The SR-VCC territory here is similar to the LTE-2G borderline region of Figure 12 to the embodiment shown in Figure 15.Particularly, carry out following flow process in the SR-VCC stage:

At step S10, UE initiates voice conversation by 2G CS network, and this audio call is anchored at VCCAS (not drawing among the figure).

At step S11, when UE A perception enters LTE and 2G borderline region, UE adheres in the LTE territory by IWF, and the similar Figure 12 of its process and method is to embodiment shown in Figure 15, and UE A passes through UP ' interface, IWF and SAE/LTE network and finishes the IMS registration process at the IMS network then.

At step S12, UE initiates Invite (VDI), and IWF is with Invite (VDI) buffer memory.

Step S2, the territory transition region:

When UE has the CS of an activity to call out and is in the SR-VCC territory and 2G-takes place this moment〉LTE switches, and UE is in the territory transition region.Particularly, carry out following flow process at the territory transition region:

At step S21-S23, the BSC in the 2G network judges whether decision triggers the switching flow of 2G to LTE.

At step S24-S27, IWF is after receiving handoff request, Invite (VDI) with buffer memory sends CSCF (Call Session Call Function, call session control module) at once, thereby triggers territory transfer process and LTE network-specific loading establishing process.

At step S28, the LTE network is set up voice bearer.

At step S29, if IWF sends handoff request to the LTE network. movable PS business is arranged 2G network support DTM and this moment, and then this moment, 2G network B SC judged, decision triggers DTM and switches.Because IWF in the S3 signaling paths, needs through IWF so PS switches message between SGSN and MME.If IWF accepts the 2G-that 2G SGSN sends over earlier〉LTE PS handoff request, then IWF at first checks this 2G-〉whether LTE PS handoff request have the CS indicating bit.If the CS indicating bit is arranged, then the IWF perception this switch to DTM and switch, IWF waits for 2G-〉LTE CS handoff request, thereby synchronously and the unified inter-eNodeB handoff request of generation.This moment, IWF sent CSCF (Call Session Call Function call session control module) with buffer memory Invite (VDI) at once, thereby triggered territory transfer process and LTE network-specific loading establishing process.When UE receives 2G-〉LTE CS handoff request, IWF carries out follow-up switching flow.If IWF accepts the 2G-that 2G MSC sends over earlier〉LTE CS handoff request, then IWF at first checks this 2G-〉whether LTE CS handoff request have the PS indicating bit.If the PS indicating bit is arranged, then the IWF perception this switch to DTM and switch, IWF waits for 2G-〉LTE PS handoff request, thereby synchronously and the unified inter-eNodeB handoff request of generation.This moment, IWF sent CSCF (CallSession Call Function call session control module) with buffer memory Invite (VDI) at once, thereby triggered territory transfer process and LTE network-specific loading establishing process.When UE receives 2G-〉LTE PS handoff request, IWF carries out follow-up switching flow.

At step S210, DTF (Domain Transfer Function territory modular converter) processing domain flow path switch.

At step S211, IWF receives that target LTE network sends the switching request response of returning.

At step S212, IWF sends handoff response to MSC.If DTM switches, then IWF will receive handoff response from the LTE network and be divided into 2G-〉LTE PS HO response and 2G-〉LTE CS HO response, send to SGSN and MSC respectively.

At step S213-215, MSC sends corresponding switching command to UE, and UE inserts target LTE network.

Step S3, the SR-VCC preparatory stage discharges:

When the CS of UE end of calling or UE are in non-SR-VCC territory, UE is in the SR-VCC preparatory stage and discharges.Particularly, the SR-VCC preparatory stage release stage is carried out following operation:

At step S31, UE sends Cancel message to IWF, and IWF deletes corresponding UE state.

It is WIMAX network, 3GPP2 HRPD network, 3GPP2UMB network and 3GPP2 1XRTT network that present embodiment is equally applicable to objective network.The relevant DTM switching flow of this embodiment is applicable to all embodiment, equally also is suitable for 3G network.

Figure 22 is that origin system is that 2G (supports double-transmission mode, be that origin system had both been supported the CS business, support IP operation again) or 3G, goal systems is to realize the idiographic flow schematic diagram of an embodiment of the method from goal systems IMS territory audio call to origin system CS territory continuous voice call under the network architecture of SAE/LTE; As shown in figure 22, the method for present embodiment comprises:

Step S6, the SR-VCC preparatory stage:

When UE has the IMS of an activity to call out and is in the SR-VCC territory, UE is in the SR-VCC preparatory stage.The SR-VCC territory here is similar to the LTE-2G borderline region among the embodiment 1.Particularly, the SR-VCC preparatory stage is carried out following flow process:

At step S61, UE initiates voice conversation by the SAE/LTE network, and this audio call is anchored at VCCAS.

At step S62, when UE A perception enters LTE and 2G borderline region, UE by IWF in the registration of CS territory, between UE and the IWF by relevant 24.008 message, its process and the method similar embodiment 1 of NAS (Non Access Stratum non-access layer information) transmission.

At step S63, UE initiates Setup (VDN), and IWF is with Setup (VDN) buffer memory.

In the specific implementation, UE just can send CM Service Request (Confirm ModeService Request, affirmation mode business request information) after after registration and give MSC, thus the negotiations process of the authentication of triggering following.The CM Service Request that this moment, IWF buffer memory UE sent.When MSC does not receive Setup message for a long time, the MM of MSC (Mobility Management mobile management) timer expiry, thus MSC triggers unusual flow process, when notice IWF discharges corresponding resource.If IWF still preserves the SR-VCC correlation behavior of UE, then IWF resends CM Service Request message, perhaps notifies UE to resend CMService Request message.Perhaps for the UE of SR-VCC, UE periodically send CM Service Request, thereby the MM state that guarantees MSC can be not overtime according to the configuration of self.

Step S7, the territory transition region:

When UE has the IMD of an activity to call out and is in the SR-VCC territory and LTE-takes place this moment〉2G/3G switches, and UE is in the territory transition region.Particularly, the territory transition region is carried out following flow process:

At step S71-S73, LTE network eNodeB judges that decision triggers LTE-〉the 2G/3G switching flow.

At step S74, IWF sends to the CS core net with buffer memory Setup (VDN) at once after receiving handoff request.

At step S75-S76, RAB (Radio Access Bearer, RAB) appointment process.。If [in order to reduce service outage duration, IWF triggers the voice dedicated bearer by Rx interface and sets up, and its process is similar to shown in Figure 12.]

At step S77, IWF sends handoff request to the 2G/3G network, judges to comprise IMS speech business and non-voice service, and decision triggers DTM and switches.Because IWF in the S3 signaling paths, needs through IWF so PS switches message between SGSN and MME, the synchronous whole flow process of IWF, its process is similar to the embodiment of Figure 15.

At step S78-S710, trigger the territory transfer process.

At step S711, DTF (Domain Transfer Function, territory modular converter) processing domain flow path switch.If in order to reduce service outage duration, VCC AS triggers two broadcasting, its process is similar to shown in Figure 180.

At step S712, IWF receives switching command.

At step S713, IWF transmits handoff response and gives MME.

At step S714-S716, MSC sends corresponding switching command to UE, and UE inserts target LTE network.

At step S717, if Connect message does not send to UE by the LTE network, then MSC sends this message to UE by the 2G/3G network.

Step S8, the SR-VCC preparatory stage discharges:

At step S81, UE sends DISCONNECT message to IWF, and IWF deletes corresponding UE state.

Above disclosed is preferred embodiment of the present invention only, can not limit the present invention's interest field certainly with this, and therefore the equivalent variations of doing according to claim of the present invention still belongs to the scope that the present invention is contained.

Claims

1, a kind of method that realizes continuous voice call is characterized in that, comprising:

2, the method for realization continuous voice call as claimed in claim 1, it is characterized in that, described interconnection functional entity is associated with described user in described user's the core net carrying of CS voice conversation based on the CS voice conversation of the voice bearer of described IP network after, also comprise:

Described user initiates continuous voice call switches, the IMS voice conversation that described user is switched in described IP network at the CS of described IP network voice conversation.

3, the method for realization continuous voice call as claimed in claim 1 is characterized in that, and is described when the user is in the CS network, and described user comprises by the step that interconnection functional entity inserts IP network:

Set up described user to the logical channel between described interconnection functional entity;

Described user is mutual based on described logical channel and described interconnection functional entity, registers in described IP network by described interconnection functional entity, consults the voice bearer data of described IP network;

Described user or described interconnection functional entity trigger described IP network and set up voice bearer according to described negotiation result;

Described user inserts described IP network by described interconnection functional entity.

4, the method for realization continuous voice call as claimed in claim 3 is characterized in that, described logical channel is unstructured supplementary data traffic passage, short message passage or non-access layer information passage.

5, the method for realization continuous voice call as claimed in claim 3 is characterized in that, described user specifically comprises by the step that described interconnection functional entity inserts described IP network:

When the mobile switching centre in the described CS network detects the voice switching that need carry out from described CS network to described IP network, notify described interconnection functional entity;

Or when the base station controller in the described CS network detects the voice switching that need carry out from described CS network to described IP network, notifying described user, described user notifies described interconnection functional entity by described unstructured supplementary data traffic logical channel;

Or described user notifies described interconnection functional entity with the metrical information of described IP network by described unstructured supplementary data traffic logical channel, determines whether that by described interconnection functional entity the voice that need carry out from described CS network to described IP network switch;

After described interconnection functional entity is determined to carry out voice from described CS network to described IP network and is switched, described interconnection functional entity triggers and carries out the switching based on described IP network, the voice bearer on the described interconnection functional entity is switched on the respective carrier network equipment of described IP network;

Described user inserts described IP network.

6, the method for realization continuous voice call as claimed in claim 3 is characterized in that, triggers described IP network at described user or described interconnection functional entity and also comprises after setting up voice bearer according to described negotiation result:

Described interconnection functional entity sends to described user by described logical channel with described bearing resource information;

Or described interconnection functional entity sends to described user by mobile switching centre and base station controller with described bearing resource information.

7, the method for realization continuous voice call as claimed in claim 3, it is characterized in that, described user inserts described IP network, and described interconnection functional entity is associated with described user in described user's the core net carrying of CS voice conversation at the voice bearer of described IP network step also comprises:

To switch to logical channel based on the logical channel of described CS network between described user and described interconnection functional entity based on described IP network.

8, the method for realization continuous voice call as claimed in claim 1 is characterized in that:

When described user was in the borderline region of described CS network and described IP network, described user inserted described IP network by interconnection functional entity.

9, a kind of method that realizes continuous voice call is characterized in that, comprising:

Described user inserts described IP network.

10, the method for realization continuous voice call as claimed in claim 9 is characterized in that, when the user was in described CS network, described user comprised by the step that interconnection functional entity inserts described IP network:

Set up described user to logical channel between described interconnection functional entity;

Described user is mutual based on described logical channel and described interconnection functional entity, registers in described IP network by described interconnection functional entity;

Described user passes through described interconnection functional entity at the IMS network registry.

11, the method for realization continuous voice call as claimed in claim 10 is characterized in that, described Russia logical channel is unstructured supplementary data traffic passage, short message passage or non-access layer information passage.

12, the method for realization continuous voice call as claimed in claim 9, it is characterized in that, described user initiates that continuous voice call switches and described interconnection functional entity is initiated switching based on described IP network, and the step of the IMS voice conversation that described user is switched in described IP network at the CS of described CS network voice conversation comprises:

Described user initiates continuous voice call switches;

The described user of described interconnection functional entity buffer memory initiates the signaling that continuous voice call switches;

After described interconnection functional entity is determined to carry out voice from described CS network to described IP network and is switched, trigger switching based on described IP network, the voice bearer on the described interconnection functional entity is switched on the respective carrier network equipment of described IP network;

Described interconnection functional entity switches according to the continuous voice call of the continuous voice call hand off signaling triggering following of buffer memory, described user is switched to the IMS voice conversation of described IP network at the CS of described CS network voice conversation.

13, the method for realization continuous voice call as claimed in claim 12, it is characterized in that, after the definite voice that need carry out from described CS network to described IP network of described interconnection functional entity switch, triggering is based on the switching of described IP network, and the step that the voice bearer on the described interconnection functional entity is switched on the bearer network equipment of described IP network comprises:

Mobile switching centre in described CS network detects and need carry out from described CS network to described IP

When the voice of network switch, notify described interconnection functional entity;

After described interconnection functional entity is determined to carry out voice from described CS network to described IP network and is switched, trigger switching based on described IP network, the voice bearer on the described interconnection functional entity is switched on the bearer network equipment of described IP network.

14, the method for realization continuous voice call as claimed in claim 9 is characterized in that,

15, a kind of method that realizes CS and PS business continuance is characterized in that, comprising:

Described user inserts described IP network.

16, the method for realization CS as claimed in claim 15 and PS business continuance is characterized in that, also comprises:

Described interconnection functional entity is controlled the synchronous switching of described continuous voice call switching and described PS business.

17, the method for realization CS as claimed in claim 16 and PS business continuance is characterized in that,

When described user was in the borderline region of described support CS and PS network and described IP network, described user inserted IP network by interconnection functional entity.

18, the method for the borderline region of a kind of user's perception CS network and IP network is characterized in that, comprising:

19, user's perception as claimed in claim 18 its enter the method for the borderline region of described CS network and described IP network, it is characterized in that the mode that the indication information that described base stations control enters the borderline region of described CS network and described IP network with the described user of described indication sends to described user is:

Send by broadcast;

Perhaps send by RRC message.

20, user's perception as claimed in claim 18 its enter the method for the borderline region of described CS network and described IP network, it is at least a to it is characterized in that described network identification information comprises in the adjacent cell list of described second network, the described second network of network frequency point information.

21, a kind of interconnection functional entity is characterized in that, comprising:

22, interconnection functional entity as claimed in claim 21 is characterized in that, described access unit comprises:

Receiving element is used to receive the signaling message that described user sends, and described signaling message sends to this interconnection functional entity by the logical channel of setting up between described user and this interconnection functional entity;

Agent unit is used for acting on behalf of described user registered and consulted voice bearer data from described IP network to described IP network according to the signaling message that described receiving element receives;

The unit is set up in carrying, is used for the negotiation result according to described agent unit, sets up voice bearer with described IP network;

Access subunit is used for described user is inserted described IP network.

23, interconnection functional entity as claimed in claim 22 is characterized in that, described access subunit comprises:

Identifying unit is used to judge that the voice that whether need carry out from described CS network to described IP network switch;

Switch unit, be used for when described identifying unit judges that definite voice that need carry out from described CS network to described IP network switch, trigger and carry out switching, the voice bearer on the described interconnection functional entity is switched on the respective carrier network equipment of described IP network based on described IP network.

24, a kind of interconnection functional entity is characterized in that, comprising:

25, interconnection functional entity as claimed in claim 24 is characterized in that, described access unit comprises:

First receiving element is used to receive the signaling message that described user sends, and described signaling message sends to this interconnection functional entity by the logical channel of setting up between described user and this interconnection functional entity;

Agent unit is used for acting on behalf of described user to described IP network registration and to the IMS network registry according to the signaling message that described first receiving element receives.

26, interconnection functional entity as claimed in claim 24 is characterized in that, described switch unit comprises:

Second receiving element is used to receive described Client-initiated continuous voice call handoff request;

Memory cell is used for the demand signalling that described continuous voice call that described second receiving element of buffer memory receives switches;

First switch unit is used to trigger and carry out the switching based on described IP network, the voice bearer on the described interconnection functional entity is switched on the respective carrier network equipment of described IP network;

Second switch unit, be used for triggering and carry out follow-up continuous voice call and switch, the IMS voice conversation that described user is switched in described IP network at the CS of described CS network voice conversation according to the call continuity handoff request signaling of described cell stores.

27, interconnection functional entity as claimed in claim 26 is characterized in that, described first switch unit comprises:

First switches subelement, be used for when described identifying unit judges that definite voice that need carry out from described CS network to described IP network switch, trigger and carry out switching, the voice bearer on the described interconnection functional entity is switched on the respective carrier network equipment of described IP network based on described IP network.

28, a kind of interconnection functional entity is characterized in that, comprising:

29, interconnection functional entity as claimed in claim 28 is characterized in that, also comprises:

Synchronous control unit is used to control the synchronous switching that described continuous voice call switches and the PS business is switched.

30, a kind of terminal equipment is characterized in that, comprising:

31, terminal equipment as claimed in claim 30 is characterized in that, also comprises:

The perception unit, be used for being positioned at origin system when described terminal, and receive the network identification information of goal systems or receive when being used to indicate described user to enter the indication information of borderline region of described origin system and described goal systems, judge that described terminal use enters the borderline region of described origin system and described goal systems, and with the storage the domain identifier information updating be described network identification information or the indication information of receiving.

32, as claim 30 or 31 described terminal equipments, it is characterized in that, described registration supporter is a destructuring logical channel support unit, be used for setting up the unstructured supplementary data traffic logical channel, to register in described goal systems by described interconnection functional entity with interconnection functional entity.