CN104254111A

CN104254111A - Processing method, equipment and system for reverse SRVCC (Single Radio Voice Call Continuity)

Info

Publication number: CN104254111A
Application number: CN201410508743.XA
Authority: CN
Inventors: 吴晓波; 徐小英; 刘海
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2010-08-30
Filing date: 2010-08-30
Publication date: 2014-12-31
Anticipated expiration: 2030-08-30
Also published as: CN104254111B

Abstract

The invention provides a processing method, equipment and system for reverse SRVCC (Single Radio Voice Call Continuity). The method comprises the following steps: before UE (User Equipment) hands over voice service from a CS (Circuit Switched) domain network to a PS (Packet Switched) domain network, preconfiguring resource information needed for voice service handover in the PS domain network; in the process that the UE hands over voice service from the CS domain network to the PS domain network, establishing a forwarding channel between a first network element of a PS domain and a second network element of a CS domain by using the preconfigured resource information, wherein the forwarding channel is used for forwarding voice data between the UE and opposite UE after the UE is accessed to the PS domain network. The reverse SRVCC handover process of the embodiment of the invention does not need to wait for the completion of a domain handover process, thus the continuity of the voice service in reverse SRVCC handover is guaranteed to be good and the voice service after handover can also be guaranteed to obtain good voice service quality.

Description

The processing method of reverse single wireless voice calling continuity, equipment and system

Technical field

The embodiment of the present invention relates to communication technical field, particularly relates to a kind of processing method of reverse single wireless voice calling continuity, equipment and system.

Background technology

Generation Mobile Telecommunication System technology (2nd Generation, 2G) or G mobile communication (3rd Generation is called for short 3G) network, formed a kind of situation of comprehensive covering through deployment for many years.And meanwhile, along with the development of network technology, some only provide packet switching (Packet Switch, be called for short PS) pure PS territory network, such as Long Term Evolution (Long Term Evolution, be called for short LTE) network etc., at the networking initial stage, also cover some cities and traffic hot spot area gradually.Thus, in current communication network, these pure PS territory networks and 2G/3G network are in and the state of depositing.

Corresponding to different communication networks, speech business has different carrying mechanisms.Particularly, in 2G/3G network, audio call supports the session service that circuit domain (Circuit Service is called for short CS) carries; And in the network of PS territory, audio call supports packet switching (Packet Switched, be called for short PS) territory carrying session service, also referred to as internet protocal carried voice technology (Voice over Internet Protocol, be called for short VOIP) class business, quality of service is provided to ensure by IP Multimedia System (IP Multimedia Subsystem is called for short IMS).

Relative to CS territory network; PS territory network can provide higher rate, higher-quality voice traffic services for user; the more data traffic requirement of user can be met; thus in order to cultivate the voice user of more PS territory network; operator can arrange the priority level in PS territory usually higher than CS territory, and voice user is preferentially quartered in the network of PS territory.Thus at CS territory network and PS territory network and under the situation of depositing, as subscriber equipment (User Equipment, be called for short UE) first in the CS territory of 2G or 3G network, initiate audio call, and when moving to region that PS territory network covers simultaneously, based on the demand to higher speech service quality, or consider the restriction of high priority, UE needs audio call to be transformed into the PS territory of LTE/HSPA network from CS territory, namely reverse single wireless voice calling continuity (Single Radio Voice Call Continuity is carried out, be called for short SRVCC) handling process.In this switching process, for audio call, the voice interruption time delay caused by switching can not more than 300ms, otherwise will cause user to experience very poor.

Existing reverse SRVCC process is realized by following two schemes usually.The first scheme be UE when carrying out reverse SRVCC process, first speech business is exited from the CS territory network of 2G/3G, more again accesses in LTE network, and initiated domain conversion handling process.In this scenario, for the access procedure of network, speech business is accessed the speed in LTE network by UE again, larger voice interruption time delay can not be produced, be not sufficient to the experience of the voice continuity having influence on user, but for the conversion of territory, it has different time values according to different application scenarioss, the shortest required time is also far longer than the minimum value 300ms of voice handoff delay requirement, thus badly influenced voice continuity when reverse SRVCC switches, service quality is poor.

The second reverse SRVCC processing scheme is that UE is when carrying out reverse SRVCC process, first in 2G/3G network, the carrying of speech business is switched to PS territory from CS territory, namely first in 2G/3G network, territory switching is carried out, carry out the access of LTE network again, speech business to be switched to completely in the PS territory of LTE network.In this scenario, although the business continuance of the speech business of UE between LTE PS territory network and 2G/3G CS territory network can be kept by the transition of the PS territory speech business of 2G/3G network, but the PS territory speech business supported due to 2G/3G PS network only can provide poor service quality for UE, and thus user can not obtain good voice service in a very long time.

Summary of the invention

The embodiment of the present invention provides a kind of processing method, equipment and system of reverse single wireless voice calling continuity, in order to solve in existing reverse SRVCC technology, good voice continuity or procedure of switching voice defect in poor service cannot be ensured because voice handoff time delay is excessive.

For achieving the above object, embodiments provide a kind of processing method of reverse single wireless voice calling continuity, comprising:

User terminal by speech business from circuit-domain network to before packet-switched domain network switches, in described packet-switched domain network pre-configured voice business switch needed for resource information;

The process that speech business switches from circuit-domain network to packet-switched domain network by described user terminal, utilize pre-configured described resource information, forwarding channel is set up between first network element and the second network element of described circuit domain of described packet-switched domain, described forwarding channel is used for after described user terminal accesses to described packet-switched domain network, forwards the Voice traffic data between described user terminal and peer user terminal.

For achieving the above object, the embodiment of the present invention additionally provides a kind of user terminal, comprising:

Resource information configuration module, for described user terminal by speech business from circuit-domain network to before packet-switched domain network switches, resource information in described packet-switched domain network needed for the switching of pre-configured voice business, to make the process that speech business switched from circuit-domain network to packet-switched domain network at described user terminal, utilize pre-configured described resource information, forwarding channel can be set up between first network element and the second network element of described circuit-domain network of described packet-switched domain network, described forwarding channel is used for after described user terminal accesses to described packet-switched domain network, forward the Voice traffic data of described user terminal and peer user terminal.

For achieving the above object, the embodiment of the present invention additionally provides a kind of mobile management entity, comprising:

Receiver module, for receiving handover request, the speech business of user terminal switches from circuit-domain network to packet-switched domain network for asking by described handover request;

Forwarding channel sets up module, for according to described handover request, the process that speech business switches from circuit-domain network to packet-switched domain network by user terminal, resource information needed for the speech business utilizing described user terminal to configure in described packet-switched domain network in advance switches, control to set up forwarding channel between the first network element of described packet-switched domain network and the second network element of described circuit-domain network, described forwarding channel is used for after described user terminal accesses to described packet-switched domain network, forward the Voice traffic data between described user terminal and peer user terminal.

For achieving the above object, embodiments provide a kind for the treatment of system of reverse single wireless voice calling continuity, comprising: user terminal, the first network element and the second network element; Wherein,

Described user terminal be used for by speech business from circuit-domain network to before packet-switched domain network switches, in described packet-switched domain network speech business in advance switch needed for resource allocation information;

Described first network element is arranged in packet-switched domain network, described second network element is arranged in circuit-domain network, the process that speech business switches from circuit-domain network to packet-switched domain network by described user terminal, utilize pre-configured described resource information, forwarding channel can be set up between first network element and the second network element of described circuit domain of described packet-switched domain, described forwarding channel is used for after described user terminal accesses to described packet-switched domain network, forwards the Voice traffic data between described user terminal and peer user terminal.

The processing method of the reverse single wireless voice calling continuity of the embodiment of the present invention, equipment and system, before speech business being switched from CS territory network to PS territory network at UE, the bearing resource information of UE in advance in the network of PS territory needed for configured voice switching, and in the middle of process speech business switched from CS territory network to PS territory network at UE, the reserved beared information utilizing PS territory network in advance for UE distributes, set up the forwarding channel between the CS territory network of speech data and PS network, thus make really to initiate speech business from CS territory network to the switching of PS territory network as UE, and after accessing to PS territory network fast, UE can carry out the transmission of speech data with distant terminal soon by this forwarding channel set up, and completing without the need to the territory flow path switch of waiting for the long period, ensure that voice business continuity energy good in reverse SRVCC handoff procedure, further, this forwarding channel set up is based upon UE and completes on the basis of PS territory network insertion, thus the speech business carried out based on this forwarding channel can also obtain good QoS of voice.

Accompanying drawing explanation

Fig. 1 is the flow chart of the processing method embodiment one of embodiment of the present invention reverse single wireless voice calling continuity;

Fig. 2 is the flow chart of the processing method embodiment two of embodiment of the present invention reverse single wireless voice calling continuity;

Fig. 3 is that in the processing method of the reverse single wireless voice calling continuity of the embodiment of the present invention, user terminal carries out IMS registration and sets up the signaling diagram of SIP session flow process before initiating reverse SRVCC and switching in PS territory;

Fig. 4 is the flow chart of the processing method embodiment three of embodiment of the present invention reverse single wireless voice calling continuity;

Fig. 5 is the signaling diagram of territory flow path switch in the processing method of the reverse single wireless voice calling continuity of the embodiment of the present invention;

Fig. 6 is the signaling diagram of the processing method embodiment four of embodiment of the present invention reverse single wireless voice calling continuity;

Fig. 7 is the signaling diagram of the processing method embodiment five of embodiment of the present invention reverse single wireless voice calling continuity;

Fig. 8 is that in the processing method of the reverse single wireless voice calling continuity of the embodiment of the present invention, user terminal carries out MS registration and sets up another signaling diagram of SIP session flow process before initiating reverse SRVCC and switching in PS territory;

Fig. 9 is the signaling diagram of the processing method embodiment six of embodiment of the present invention reverse single wireless voice calling continuity;

Figure 10 is the structural representation of embodiment of the present invention user terminal embodiment one;

Figure 11 is the structural representation of embodiment of the present invention user terminal embodiment two;

Figure 12 is the structural representation of the embodiment one of embodiment of the present invention mobile management entity equipment;

Figure 13 is the structural representation of the embodiment two of embodiment of the present invention mobile management entity equipment;

Figure 14 is the structural representation of the treatment system embodiment of embodiment of the present invention reverse single wireless voice calling continuity.

Embodiment

For making the object of the embodiment of the present invention, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.

Fig. 1 is the flow chart of the processing method embodiment one of embodiment of the present invention reverse single wireless voice calling continuity, and as shown in Figure 1, this method comprises the steps:

Step 100, UE by speech business from CS territory network to before PS territory network switches, in the network of PS territory pre-configured voice business switch needed for resource information;

In the reverse SRVCC processing scheme of the embodiment of the present invention, UE initiate by speech business from CS territory network to the switching that PS territory network carries out before, in order in the network of PS territory, configuration can by speech business carrying to the resource information in the network of PS territory in advance, after formally initiating with the reverse SRVCC handoff procedure of box lunch, core network element in the network of PS territory can utilize pre-assigned bearing resource, rapidly for UE sets up the new voice bearer path between distant terminal, UE is before the switching also not initiating speech business, the configuration from the user media aspect in the server network element of PS territory will be completed in advance in the network of PS territory, thus in the network of PS territory, configure certain resource information for transmitting VoP in advance.

Particularly, before this set-up procedure occurs in the reverse SRVCC switching of UE initiation speech business, UE passes through in advance at PS territory network, as the configuration of completing user media aspect in LTE network, make PS territory server network element can in advance for UE divides the required resource information being used in VOIP speech business in carrying PS territory network, the address of such as UE in the network of PS territory needed for carry voice traffic, number, the resource informations such as encoding and decoding, thus when the territory that UE really initiates speech business switches, control network element can utilize this pre-assigned resource information, rapidly for UE sets up the new voice bearer passage between distant terminal, thus guarantee the continuity of the speech business of UE in handoff procedure.

Step 101, initiate speech business from CS territory network to the process of the switching of PS territory network at UE, utilize pre-configured resource information, forwarding channel is set up between first network element and the second network element of PS territory network of CS territory network, this forwarding channel is used for after UE accesses in the network of PS territory, forwards the Voice traffic data of UE.

And really initiate speech business from the handoff procedure of CS field to PS field at UE, owing to carry out this reverse SRVCC switching at UE before, PS territory network is in advance for UE is assigned with the resource information that can be used for carrying the related service of UE in the network of PS territory, thus in the process switched, PS territory network can utilize this pre-configured resource information, new carries out the mutual data forwarding channel of speech data with distant terminal rapidly for UE sets up.

Particularly, in order to eliminate the impact of the conversion required time long interruption time delay on voice service switchover in territory in reverse SRVCC process, to set up the speech data forwarding channel between UE and distant terminal fast, in embodiments of the present invention, after UE initiates reverse SRVCC business switching flow, utilize UE PS territory network in registration process to be in advance the reserved resource information that UE distributes in advance, the second network element in the first network element in the network of CS territory and PS territory network will set up forwarding channel to each other.This forwarding channel is used for after UE accesses to PS territory network, specifically refer to an access (the Evolved Node B to PS territory network, be called for short ENB) after, and before UE carries out territory flow path switch, speech data mutual between UE and opposite end UE is forwarded, is equivalent to provide the path that a new UE and opposite end UE carries out voice conversation.

Because PS territory network is in advance for UE is assigned with the resource information for carrying the business of UE in PS territory, based on the resource information that this is pre-configured, forwarding channel between first network element and the second network element can be set up very soon, and without the need to depending on completing of the territory flow path switch of UE in reverse SRVCC handoff procedure.Simultaneously, for UE, UE, in the handoff procedure of reverse SRVCC, can also complete the access operation in the network of PS territory rapidly, to access in the ENB of PS territory network, thus in embodiments of the present invention, after UE has initiated to switch the reverse SRVCC of speech business, once UE successfully accesses in the network of PS territory, by this forwarding channel, UE just can carry out speech data at once with opposite end UE mutual, and completing without the need to the territory flow path switch of waiting for the long period.Thus MME can be in the short period of time, under the network environment of PS territory, the speech business of UE is switched to fast PS territory network VOIP carrying in the middle of, voice communication is set up soon with distant terminal, even if territory converts the voice handoff time delay that required overlong time also can not have influence on the reverse SRVCC of the embodiment of the present invention, thus ensure that the voice continuity that in handoff procedure, speech business is good.

Further, complete on the basis of PS territory network insertion because this new forwarding channel set up acts on UE, thus the VOIP speech business type of PS network is belonged to based on the speech business of the UE of this forwarding channel, thus compared to 2G/3G network PS field speech business transition scheme of the prior art, this forwarding channel can also ensure that in handoff procedure, the speech business of UE obtains good service quality.

The processing method of the reverse single wireless voice calling continuity business of the present embodiment, before speech business being switched from CS territory network to PS territory network at UE, UE has carried out the configuration of the bearing resource information needed for speech business switching in advance in the network of PS territory, and in the middle of process speech business switched from CS territory network to PS territory network at UE, the reserved beared information utilizing PS territory network in advance for UE distributes, set up the forwarding channel between the CS territory network of speech data and PS network, thus make really to initiate speech business from CS territory network to the switching of PS territory network as UE, and after accessing to PS territory network fast, UE can carry out the transmission of speech data with distant terminal soon by this forwarding channel set up, and completing without the need to the territory flow path switch of waiting for the long period, ensure that voice business continuity energy good in reverse SRVCC handoff procedure, further, this forwarding channel set up is based upon UE and completes on the basis of PS territory network insertion, thus the speech business carried out based on this forwarding channel can also obtain good QoS of voice.

Fig. 2 is the flow chart of the processing method embodiment two of embodiment of the present invention reverse single wireless voice calling continuity, and as shown in Figure 2, this method comprises the steps:

Step 200, UE by speech business from CS territory network to before PS territory network switches, in the network of PS territory, carry out IMS registration and set up Session initiation Protocol (Session Initiation Protocol, be called for short SIP) session, with in the pre-configured resource information of PS territory network;

In the present embodiment, UE by speech business from CS territory network to before PS territory network switches, the IMS registration that the resource information layoutprocedure of carrying out in the network of PS territory in advance specifically can be carried out by UE in advance in the network of PS territory and SIP session establishment flow process are achieved, particularly, the pre-configured process of this resource information specifically can comprise following a few sub-steps:

Step 2000, UE is at Serving GPRS Support Node (the Serving GPRS Support Node of PS territory network, be called for short SGSN) above initiate attachment flow and main packet data protocol (Packet Data Protocol is called for short PDP) activation process;

UE by speech business from CS territory network to before PS territory network switches, the register flow path that can specify according to agreement, completes registration in advance in the network of PS territory.Particularly, the flow process that UE can specify according to agreement, the SGSN equipment sequentially to PS territory network is initiated and completes attachment (Attach) flow process and main PDP activation flow process.By this attachment and main PDP activation process, UE can consult with SGSN the information that UE initiates needed for audio call in the network of PS territory, encoding and decoding speech type (CodeC) information of such as UE in the network of PS territory, and for session translation number (the Session Transfer Number for Single Radio Voice Call Continuity of SRVCC, be called for short STN-SR) information, and make the resource of PS domain network side needed for UE distribution.Particularly, for CodeC information, in the attachment flow that UE initiates, UE can be carried at the CodeC information giving tacit consent to support in the network of PS territory in the attachment request sent to SGSN, thus based on this CodeC information, SGSN can learn the code/decode type that UE is corresponding in PS territory.

Alternatively, after main PDP activation flow process, UE can also initiate secondary PDP activation flow process to SGSN, this secondary PDP activation flow process helps out to main PDP activation flow process, and in this secondary PDP activation flow process, UE can indicate the grade of service of this time PS territory network registry of UE to SGSN, such as, indicate this register flow path specifically for speech business.

Step 2001, UE initiates SIP session establishment process to the service set of PS territory network and continuous application server (Service Centralization and Continuity Application Server is called for short SCC AS);

After UE completes the registration in PS territory on SGSN, further, UE can also initiate the request of SIP session establishment to SCC AS, by initiating the SIP session establishment process between SCC AS, sets up reserved SIP session connection in advance in the network of PS territory.Particularly, UE initiates the object of this SIP session establishment request and really is to set up SIP session with opposite end UE, in fact, this SIP session connection of setting up in advance is not initiated speech business from CS territory network to before the switching of PS territory network at UE, any Essential Action can not be played, it can be only for UE distributes corresponding resource in the server net of PS territory, and do not carry out the transmission of any data, even in the process of this SIP session establishment, SCC AS is without the need to sending real calling to opposite end UE.But once UE has initiated the reverse SRVCC handoff procedure of speech business, in this reverse SRVCC handoff procedure, UE just can based on this pre-assigned resource, rapidly speech business is switched in the VOIP voice in PS territory, and carry out the territory flow path switch of follow-up speech business, thus without the need to initiating SIP session follow-up carrying out again in the process of territory conversion temporarily, thus be equivalent to the speed accelerating follow-up territory flow path switch.

Particularly, UE can carry special reverse SRVCC indication information in the SIP session establishment request sent to SCC AS, it is in follow-up reverse SRVCC switching flow that this reverse SRVCC indication information is used to indicate the SIP session that SCC AS now sets up, thus to indicate SCC AS when setting up SIP session according to this SIP session establishment request for UE, without the need to initiating real calling to opposite end UE.Further, due in embodiments of the present invention, the SIP session that UE sets up in advance in the network of PS territory and pre-configured resource information are before UE carries out reverse SRVCC switching, all can not carry out the transmission of the speech data of essence, and for any voice bearing path, if all do not have the transmission of packet in long-time, according to the regulation of protocol layer, corresponding core network element may discharge the resource information belonging to this carrying.Thus in embodiments of the present invention, in order to avoid the generation of this situation, the reverse SRVCC indication information that UE carries in the SIP session establishment request sent to SCC AS, even if can also be used to indicate SCC AS long-time in when this reserved SIP session connection does not have any data to transmit, also initiatively do not trigger the dispose procedure of the resource information of UE.

In practical application, UE is carried above-mentioned reverse SRVCC indication information and specifically can be realized by following two kinds of modes in the SIP session establishment request sent to SCC AS: UE can carry separately an indication information in the request of SIP session establishment, such as rSRVCC indication information, the foundation of this SIP session of this rSRVCC indication information instruction SCC AS is in fact in follow-up reverse SRVCC switching; Or, special called number is carried in the SIP session establishment request that UE can also send to SCC AS, this special called number can be a number specifically switched for reverse SRVCC, SCC AS is when receiving the SIP session establishment request of carrying similar called number, equally also can learn that this SIP session is in switching for reverse SRVCC, thus the bearing resource information needed for only consulting with UE to distribute in the process of this SIP session establishment, and audio call can not be initiated to opposite end UE veritably.

Further alternatively, carry out IMS registration at above-mentioned UE in the network of PS territory, set up in the process of the SIP session connection of PS territory network, UE, except sending except reverse SRVCC indication information to SCC AS, can also send another indication information to SGSN.This indication information is used to indicate SGSN after establishing the SIP session of UE in the network of PS territory, does not initiate the process of establishing of RAB (Radio Access Bearer is called for short RAB).And UE sends this indication information and is with the reason indicating SGSN and do not initiate RAB process of establishing: before switching at reverse SRVCC, the Essential Action setting up this SIP session connection for UE is, for follow-up reverse SRVCC handoff procedure is prepared, and before this reverse SRVCC handoff procedure carries out, this SIP session connection is not carried out the transmission of any speech data of UE, thus accordingly, SGSN also without the need to initiating the RAB process of establishing of essence, thus can be avoided the waste of resource.

Particularly, UE can send above-mentioned indication information according to following several method to SGSN.If what SGSN supported is Gn/Gp pattern, UE can in the main PDP activation process of above-mentioned steps 2000, by when sending main PDP activation request to SGSN, corresponding flag is set, maximum bit rate (Maximum Bite Rate is such as set, being called for short MBR) field is 0, to inform that SGSN does not initiate RAB process of establishing; Secondly, UE can also carry indication information in the main PDP activation request sending to SGSN, to indicate this VOIP voice bearer of SGSN to reserve for reverse SRVCC, thus to indicate SGSN not initiate RAB process of establishing; Again, UE can not also increase any special instruction, and after SGSN receives the main PDP activation request of UE transmission, if network does not support the ability setting up the speech business of PS territory, SGSN also can not trigger the process of establishing of RAB.And if SGSN supports is the pattern of S4, UE then can when sending main PDP activation request to SGSN, by service quality (the Quality of Service carried in this request, be called for short QoS) the Traffic Class parameter that class of service is conversation class is set, to inform that SGSN is without the need to triggering RAB process of establishing in parameter.

It should be noted that in addition, if above-mentioned in the attachment flow of SGSN, UE does not report its CodeC information supported in the network of PS territory to SGSN, alternatively, in the signalling interactive process of the SIP session establishment carried out at this step UE and SCC AS, UE can also consult UE this CodeC information at PS territory network with SCC AS, and is consulting successfully, by SCC AS, the CodeC information after negotiation is carried in sip response message, returns to UE.In addition, for identifying the information such as the destination address of the business transmission of UE in the network of PS territory, also can in this signalling interactive process, held consultation by UE and SCC AS, and by SCC AS, the address information after negotiation is carried in sip response message, collaborative CodeC information together, returns to UE.By the registration process of UE in the network of PS territory of this step 200, PS territory network is that UE has allocated UE reserved resource information for transmitting audio data in the network of PS territory in advance.Particularly, this reserved resource information is except comprising UE except the information such as the STN-SR number in the network of PS territory, address or CodeC, further, this reserved resource information at least also should comprise the first network element, such as territory transfer gateway (Access Transfer Gateway in the network of PS territory, be called for short ATGW) or grouped data network gateway (Packet Data Network Gateway, be called for short PGW), distribute to the first information that UE switches for reverse SRVCC.

It is the address distributed of UE and/or the information such as port that this first information specifically can comprise the first network element, and based on this first information, other network elements in network can identify this first network element, thus set up data forwarding channel with the first network element.It should be noted that, the pre-assigned port information of first network element of indication is specifically as follows in the first network element herein, be the information of the port of reverse SRVCC handoff reservation in advance, namely the first network element can specify a specific port in reverse SRVCC handoff procedure in advance, thus when the first network element is the UE distribution first information, first network element, but can by the information distribution of preassigned port to UE without the need to being that UE distributes port more temporarily.Also it should be noted that simultaneously, due in practical application, ATGW usually and territory conversion and control function (Access Transfer Control Functionality, be called for short ATCF) be integrated setting, thus in embodiments of the present invention, follow-up mention that the first network element is ATGW time, all replaced for ATCF/ATGW with the first network element, represent other network elements send to the signaling message of ATGW all can by ATCF forward deliver to.

Particularly, can, in the main PDP activation flow process of SGSN initiation in above-mentioned steps 2000, SGSN be indicated to obtain the first information to PGW if the first network element is PGW, UE; Or if UE is after initiating main PDP activation flow process to SGSN, also have issued secondary PDP activation request to SGSN, UE can also in secondary PDP activation flow process, and instruction SGSN obtains the first information to PGW.And if the first network element is ATCF/ATGW, UE then can in the above-mentioned IMS registration process in PS territory, IMS registration is anchored on ATCF equipment, and in SIP session establishment process between SCC AS, the user face of SIP session is anchored on ATGW, thus make ATCF/ATGW be that UE distributes corresponding bearing resource information in the network of PS territory, namely distribute the above-mentioned first information.

In embodiments of the present invention, it should be noted that further, IMS registration in PS territory is completed and to after SCC AS has initiated the foundation of SIP session at UE, in order to reduce the handover delay that UE brings in reverse SRVCC handoff procedure further, alternatively, UE can also be on this basis, in the network of PS territory in advance set up with SCC AS between, for carrying the reserved VOIP voice bearer of the VOIP speech business of UE, namely further in the server network element of PS territory for UE divides the beared information being used in VOIP speech business.This reserved VOIP voice bearer set up in advance is equally in follow-up reverse SRVCC handoff procedure, and be in suspended state before the handover, and by setting up the VOIP voice bearer of this hang-up in advance, really initiate in the process of reverse SRVCC switching at UE, UE without the need to carrying out the foundation of VOIP voice bearer more temporarily, thus accelerates speed speech business being switched to PS territory network further.

It should be noted that simultaneously, except after setting up the SIP session connection between UE and SCC AS, before reverse SRVCC handoff procedure, for UE sets up reserved VOIP voice bearer, in embodiments of the present invention, if the first network element of bearer network is ATCF/ATGW in PS territory, the process of establishing of this VOIP voice bearer after UE initiates reverse SRVCC handover request, in the handoff procedure of reverse SRVCC, can also be triggered by the core network element in the network of PS territory and carries out equally.Particularly, the triggering of this VOIP voice bearer process of establishing can by the SGSN in the network of PS territory, mobile switching centre's (Mobile Switching Center is called for short MSC), ATCF or other core network element, trigger immediately after UE initiates reverse SRVCC handover request and carry out.And compared to the above-mentioned scheme of carrying out reserved VOIP voice bearer and setting up before reverse SRVCC handoff procedure, although the program just carries out the foundation of VOIP voice bearer in reverse SRVCC handoff procedure, but but avoid in the appearance that the situation just needing reserved related voice resource in the network of PS territory before reverse SRVCC switches also does not occur, thus avoid the wasting of resources in the network of PS territory.

It should be noted that in addition, due to for speech business, UE can also be divided into support dual-transfer mode (Dual Transfer Mode, be called for short DTM) or universal mobile telecommunications system (Universal Mobile Telecommunications System, be called for short UMTS), and do not support DTM pattern or UMTS pattern two type.If support DTM or UMTS pattern, the speech business of UE and data service can be carried in the type different with two kinds, PS territory of CS territory simultaneously respectively, thus before UE carries out reverse SRVCC switching, UE can after establishing the voice conversation in CS territory with opposite end UE, carry out the IMS registration of PS territory network again, new IMS registration flow process can not affect the speech business of UE in the network of former CS territory, if and UE does not support DTM or do not support UMTS pattern, the speech business of UE and data service then can not dissimilar by two kinds of being carried on CS territory and PS territory simultaneously on, thus before UE carries out reverse SRVCC switching, the IMS registration that UE carries out at PS territory network and SIP session establishment then must complete before UE sets up the voice conversation in CS territory in the network of CS territory, namely the resource first in the network of PS territory needed for UE distribution, UE sets up normal voice conversation again in the network of CS territory, speech business is carried in the network of CS territory, thus avoid occurring that the registration of IMS registration and SIP session affects the situation of the speech business in the network of former CS territory.

Step 201, UE initiates speech business from CS territory network to the switching of PS territory network;

Step 202, utilizes pre-configured resource information, sets up forwarding channel between first network element in PS territory and second network element in CS territory;

Step 203, UE accesses in the network of PS territory;

IMS registration in the network of PS territory and SIP session establishment process is completed at UE, and make PS territory network before the handover just in advance for UE be assigned with carrying transmitting audio data needed for resource information after, when speech business is really carried out the process switched from CS territory network to PS territory network by UE, utilize PS territory network for UE these resource informations pre-assigned, and the SIP session of setting up in advance, first network element in PS territory and second network element in CS territory, under UE does not carry out the prerequisite that territory conversion or territory flow path switch do not complete, forwarding channel to each other can be set up smoothly.Thus when the ENB in the network of PS territory is according to handover request, for UE distributes access switchable resource, and UE accesses to after in the network of PS territory smoothly, forwarding channel between this first network element and second network element just may be used for after UE accesses to PS territory network, do not carrying out before territory conversion operations or territory flow path switch do not complete, carrying the speech data between UE and opposite end UE and transmitting.

Particularly, second network element of this CS territory network is specifically as follows the MSC (hereinafter referred to as rSRVCC MSC) for supporting SRVCC business, the downstream voice data that UE sends to opposite end UE can pass through UE, ENB, first network element, forwarding channel between the first network element and the second network element, and be sent to opposite end UE by the second network element, the upstream voice data that opposite end UE sends to UE then can be sent to UE by contrary path, thus UE is under the prerequisite not relying on territory flow path switch, also the transmission of speech data can be carried out by this newly-established forwarding channel and opposite end UE, ensure that the good performance continuously of audio call in handoff procedure.

Particularly, in reverse SRVCC handoff procedure, the foundation of the forwarding channel between this first network element and second network element can be controlled to carry out by mobile management entity (Mobility Management Entity is called for short MME).Such as, if the first network element of PS territory network is PGW, in embodiments of the present invention, MME controls to utilize pre-configured resource information, and the detailed process setting up forwarding channel between first network element in control PS territory and second network element in CS territory can be as follows:

Due in the registered in advance process of UE, the first information such as address and/or port that the first network element distributes to UE has been obtained by SGSN and has preserved, and thus in reverse SRVCC handoff procedure at this moment, MME can acquire this first information from SGSN; Further, forwarding channel is set up with the first network element in order to enable the second network element in the network of CS territory, for transmission speech data, the first information got also is transmitted to the second network element by MME, be equivalent to the information such as address and/or port of informing the second network element first network element, thus make when the second network element receives the upstream voice data that opposite end UE sends to UE, can according to this information, this upstream voice data is transmitted, this upstream voice data to be sent in UE to the first network element.

Further, in order to the information such as address and/or port making the first network element know the second network element too, with receive at the first network element UE send to the downstream voice data of opposite end time, can according to the relevant information of the second network element known, downstream voice data is sent to the second corresponding network element, and then being sent to opposite end UE, MME is also from second network element in CS territory, and namely rSRVCC MSC place obtains the second information that rSRVCC MSC distributes to forwarding channel.Similarly, this second information comprises the information such as address and/or port that rSRVCC MSC distributes to UE.After MME gets this second information from the second network element, this second information is transmitted to the first network element, if thus the first network element receives UE when sending to the downstream voice data of opposite end UE, according to the address of the second network element and/or port information, downstream voice data can be sent to the second network element equally.

It should be noted that, while the address that the first network element distributes by MME and/or port information are transmitted to the second network element, the contextual information can also registered to the second network element forwarding UE in registration process, the CodeC information that such as UE is corresponding in the network of PS territory, and STN-SR information, to make the second network element rSRVCC MSC according to this CodeC information, corresponding encoding operation can be carried out to the upstream voice data that the opposite end UE received sends, and corresponding encoding operation is carried out to the downstream voice data that UE sends, then transmit between UE and opposite end UE.

And if the first network element in the network of PS territory is ATCF/ATGW, in embodiments of the present invention, MME controls to utilize pre-configured resource information, the process setting up forwarding channel between control ATCF/ATGW and rSRVCC MSC then can for following process: MME be after the handover request receiving rSRVCC MSC forwarding, first can get from SGSN equipment the STN-SR information that UE registers in advance in the network of PS territory, and this STN-SR information is transmitted to the second network element in the network of CS territory, be namely transmitted to rSRVCC MSC; After rSRVCC MSC learns the STN-SR information that UE registers in the network of PS territory, UE can be addressed to exactly in registered in advance process by the ATCF equipment of registration request grappling, thus by ATCF equipment, rSRVCC MSC is to send to the first NE User face entity A TGW in the network of PS territory by the second information of the address of distributing IP and/or port; And then first NE User face entity A TGW after the address of cicada rSRVCC MSC and/or port information, also can by advance for the address of UE distribution and/or the first information of port send to rSRVCC MSC exactly.Thus after the first network element and the second network element mutually mutual address each other and/or port information, the forwarding channel between the first network element and the second network element is equally successfully set up.

It should be noted that, in above process, if UE is the type supporting DTM or UTMS pattern, above-mentioned MME gets the step of the STN-SR information that UE registers in advance in the network of PS territory from SGSN equipment, handover request can received by SGSN, initiatively STN-SR information is together being sent to MME and realizes in the handover request forwarded to MME; And if UE is the type not supporting DTM or UTMS pattern, SGSN can not receive handover request, thus above-mentioned MME gets the step of the STN-SR information that UE registers in advance in the network of PS territory from SGSN equipment, identified query request can be sent to HSS by MME, such as send location update request message, to be identified at according to UE the SGSN that in HSS, inquiry is corresponding with UE, thus obtain the contextual information of UE registered in advance again to SGSN, be achieved comprising STN-SR information.

It should be noted that in addition, if the first network element in the network of PS territory is ATCF/ATGW, in embodiments of the present invention, ATCF/ATGW and rSRVCC MSC utilizes pre-configured resource information, the process setting up forwarding channel each other can not also control to perform by MME, this process is for described in below particularly: rSRVCC MSC is after receiving handover request, the identified query request of carrying UE mark can also be sent directly to HSS, such as location update request message, to inquire about the mark of the SGSN corresponding with UE in HSS; And after inquiring the mark of SGSN, rSRVCC MSC can forward handover request directly to the SGSN specified, obtained the contextual information of UE registered in advance to SGSN by this handover request, thus handover request and then can be transmitted to MME by SGSN, with trigger target side carrying set-up procedure, rSRVCC MSC is according to the STN-SR information of the UE got simultaneously, UE can be addressed directly in registered in advance process by the ATCF equipment of registration request grappling, thus by this ATCF equipment, and set up forwarding channel between the first network element ATGW.

From above-mentioned explanation, in the process that the reverse SRVCC of UE switches, the process setting up forwarding channel between the first network element and the second network element in several ways, and in following embodiment, can will distinguish the detailed various implementation of description.

It should be noted that in addition, in embodiments of the present invention, in the process that the reverse SRVCC of UE switches, UE accesses to the process setting up forwarding channel between process domain first network element of PS territory network and the second network element and can intersect simultaneously carry out.Particularly, the ENB of PS territory network can simultaneously for UE distributes the resource of access in the process of establishing of forwarding channel, because the processing speed of UE in network insertion flow process is usually very fast, thus before forwarding channel completes foundation, UE can successfully access in the network of PS territory usually.Thus, once forwarding channel completes foundation, UE just by the communication link of the ENB of PS territory network, the first network element, forwarding channel between the first network element and the second network element and the second network element, can carry out voice data communication with opposite end UE, is equivalent to complete the switching in the network of PS territory.And the process of establishing of this forwarding channel is relative to territory flow path switch, also only the shorter time is needed, thus in embodiments of the present invention, speech business can switch in the network of PS territory by UE rapidly, what switch completes and does not rely on territory flow path switch, thus ensure that voice business continuity energy good in reverse SRVCC handoff procedure, further, the UE that is based upon of this forwarding channel completes on the basis of PS territory network insertion, and the speech business that thus UE carries out based on this forwarding channel can also obtain good QoS of voice.

And for opposite end UE, it should be noted that, although now UE has accessed in the network of PS territory, and also the speech business of self is carried in the network of PS territory, but because opposite end UE is still by second network element in CS territory, namely speech data is carried out by MGW and UE mutual, thus for the UE of opposite end, it can not know that speech business has been switched to the fact in the network of PS territory by UE, still think and oneself still carry out voice data communication with the UE be in the network of CS territory, but this point can't affect the service quality of speech business between the two, also any other bad problem can not be brought.

Step 204, UE initiated domain flow path switch;

Step 205, after territory flow path switch completes, the resource shared by SCC AS Co ntrolled release forwarding channel.

And set up at forwarding channel, UE can utilize this forwarding channel, utilize after the reserved VOIP voice bearer set up in advance and opposite end UE carry out voice data communication, in embodiments of the present invention, in order to real, speech business between UE and opposite end UE is switched in the network of PS territory, alternatively, UE can also initiated domain flow path switch on this basis.This territory flow path switch carries out on the basis that UE can carry out normal VOIP speech business with opposite end UE, and thus the speed speed of territory flow path switch can't cause the interruption of the speech business of UE.

And after territory flow path switch completes, UE is without the need to being sent to opposite end UE by the forwarding channel between the first network element and the second network element by downstream voice data, also without the need to being received the upstream voice data that opposite end UE sends by this forwarding channel, but ENB, gateway (Serving Gateway can be passed through, be called for short Serving GW), this communication link of PGW, direct and opposite end UE carries out voice data communication, thus now SCC AS can fall resource shared by forwarding channel by Co ntrolled release, really to complete the flow process that reverse SRVCC switches.

The processing method of the reverse single wireless voice calling continuity of the present embodiment, before speech business being switched from CS territory network to PS territory network at UE, UE carries out IMS registration in advance and initiates the foundation of SIP session in the network of PS territory, with the bearing resource information making PS territory network in advance for UE distributes, and in the middle of process speech business switched from CS territory network to PS territory network at UE, the reserved beared information utilizing PS territory network in advance for UE distributes, set up the forwarding channel between the CS territory network of speech data and PS network, thus make really to initiate speech business from CS territory network to the switching of PS territory network as UE, and after accessing to PS territory network fast, UE can carry out the transmission of speech data with distant terminal soon by this forwarding channel set up, and completing without the need to the territory flow path switch of waiting for the long period, ensure that voice business continuity energy good in reverse SRVCC handoff procedure, further, this forwarding channel set up is based upon UE and completes on the basis of PS territory network insertion, thus the speech business carried out based on this forwarding channel can also obtain good QoS of voice.

Fig. 3 is that in the processing method of the reverse single wireless voice calling continuity of the embodiment of the present invention, user terminal carries out IMS registration and sets up the signaling diagram of SIP session flow process before initiating reverse SRVCC and switching in PS territory.In the present embodiment signaling diagram, do not support DTM or UTMS pattern with UE, and first network element in PS territory is ATCF/ATGW is example, the IMS registration that UE is carried out in the network of PS territory in advance and the idiographic flow being set up to SIP session are described.As shown in Figure 3, in the present embodiment, UE is before the reverse SRVCC switching flow of initiation, and the set-up procedure of carrying out in the network of PS territory specifically comprises the steps:

Step 300, UE sends attachment request to SGSN;

Step 301, SGSN returns attachment response to UE;

Step 302, UE sends main PDP activation request to SGSN;

Step 303, SGSN returns the response of main PDP activation to UE;

Step 304, UE sends secondary PDP activation request to SGSN;

Step 305, SGSN returns secondary PDP activation response to UE;

Wherein, step 304,305 is optional.Auxiliary PDP can when SCC AS/ATCF receives the request of SIP session establishment, and trigger policy and charging rule functions (Policy and Charging Rules Function is called for short PCRF) initiate the foundation of carrying.

Due in the present embodiment, do not support that DTM or UTMS pattern is described for UE, namely UE can not support the voice bearer in CS territory and the voice bearer in PS territory simultaneously, thus the IMS registration in PS territory that UE performs before reverse SRVCC switches must initiate the audio call of CS territory network at UE, carry out before establishing CS territory voice conversation with opposite end UE.In practical application, UE just can perform this beamhouse operation in PS territory when just starting start.

Particularly, in the present embodiment, what UE carried out in the network of PS territory register specifically can be divided into two processes: the registration in the network of PS territory that first process is carried out on SGSN equipment as UE, and second process is the IMS registration that UE carries out, and then initiates SIP voice call procedure.And in first injection volume process, specifically can comprise the several step of above-mentioned steps 300-305.Alternatively, in the attachment request that UE sends to SGSN, UE can also be carried at code/decode type (CodeC) information giving tacit consent to support in the network of PS territory in attachment request, and based on this CodeC information, SGSN can learn the code/decode type that UE supports in the network of PS territory.

And after the registration completed on SGSN in the network of PS territory at UE, UE based on the information of this registration, SCC AS can carry out the registration of IMS further, and particularly, the registration process of this IMS specifically can comprise the steps:

Step 306, UE sends IMS registration request by SGSN to ATCF;

Alternatively, in this step, after SGSN receives the IMS registration request of UE transmission, SGSN can also pass through Gateway GPRS Support Node (Gateway GPRS Support Node is called for short GGSN) and IMS registration request is sent to ATCF.

Step 307, IMS registration is anchored to self by ATCF;

Step 308, ATCF is that UE distributes STN-SR information, and this STN-SR is carried in IMS registration request and is transmitted to SCC AS by query call conversation control function (Interrogating/Serving Call Session Control Function, be called for short I/S-CSCF);

Step 309, the STN-SR of UE is updated in HSS by SCC AS;

Step 310, the STN-SR of UE is updated in SGSN by HSS;

After UE completes the registration in PS territory on SGSN, alternatively, UE can also initiate IMS registration flow process to SCC AS, and initiate SIP session establishment process further, by the SIP session establishment process between SCC AS, in the network of PS territory, set up the reserved VOIP voice bearer that corresponds to UE in advance.Particularly, in the present embodiment, first UE needs IMS registration request to be anchored on ATCF network element, to be initiated the foundation of SIP session by ATCF.IMS registration request can be sent by UE to ATCF at this anchoring process, after ATCF receives IMS registration request, IMS registration process be anchored to self and is achieved.Further, after IMS registration process is anchored to self by ATCF, also can be UE and distribute the STN-SR mark of UE in the network of PS territory, and STN-SR is carried in IMS registration request is transmitted to SCC AS by I/S-CSCF, to make SCC AS distribute to this STN-SR identification renewal of UE in database HSS, and then be updated in SGSN.

Step 311, UE sends the request of SIP session establishment to ATCF;

Step 312, SIP Session Anchor on ATGW, makes ATGW be that UE divides the first information being used in carrying VOIP speech business by ATCF;

Step 313, the request of SIP session establishment is transmitted to SCC AS by I/S-CSCF by ATCF;

After IMS registration request is anchored on ATCF by UE, ATCF can when UE sends SIP session establishment request to it, further by this SIP Session Anchor on ATCF/ATGW, and ATGW is address and/or information, the i.e. first information that UE divides the VOIP speech business being used in carrying UE in this anchoring process.Particularly, ATCF is receiving the SIP session establishment request of UE, and by after this SIP Session Anchor is on ATGW, this SIP session establishment request is transmitted to SCC AS by I/S-CSCF, thus SCC AS completes the contextual configuration of UE, and the information configured for UE is returned to ATCF by I/S-CSCF.Alternatively, in the present embodiment, SIP session establishment request message can terminate on ATCF by ATCF.

Particularly, the object of SIP session establishment request initiated due to UE really are to set up SIP session with opposite end UE, this SIP session connection of setting up in advance is not initiated speech business from CS territory network to before the switching of PS territory network at UE, any Essential Action can not be played, it can be only for UE distributes corresponding resource in the server net of PS territory, and does not carry out the transmission of any data.But once UE has initiated the reverse SRVCC handoff procedure of speech business, in this reverse SRVCC handoff procedure, UE just can based on this pre-assigned resource, rapidly speech business is switched in the VOIP voice in PS territory, and carry out the territory flow path switch of follow-up speech business, thus without the need to initiating SIP session follow-up carrying out again in the process of territory conversion temporarily, set up VOIP voice bearer, thus be equivalent to the speed accelerating follow-up territory flow path switch.

Thus, in the SIP session establishment request that UE is sent by ATCF, UE can carry reverse SRVCC indication information, it is in follow-up reverse SRVCC switching flow that this reverse SRVCC indication information is used for the final SIP session indicating SCC AS now to set up, thus to indicate SCC AS when setting up SIP session according to this SIP session establishment request for UE, only need at this SIP session establishment request message of processing locality, and without the need to initiating real audio call to opposite end UE, and when even if long-time this reserved SIP session connection interior does not have any data to transmit, also the dispose procedure of the resource information of UE is not initiatively triggered.

In practical application, UE is carried above-mentioned reverse SRVCC indication information and specifically can be realized by following two kinds of modes in the SIP session establishment request sent to SCC AS: UE can carry separately an indication information in the request of SIP session establishment, such as rSRVCC indication information; Or, carrying special called number in the SIP session establishment request that UE can also send to SCC AS, to indicate SCC AS when receiving the SIP session establishment request of carrying similar called number, learning that this SIP session is in switching for reverse SRVCC.

Further preferably, sent in the process of SIP session establishment request to SCC AS by SGSN at above-mentioned UE, UE, except finally sending to except SCC AS by reverse SRVCC indication information, can also send another indication information to SGSN.This indication information is used to indicate SGSN after establishing the SIP session of UE in the network of PS territory, does not initiate the process of establishing of RAB.Before switching at reverse SRVCC, the Essential Action setting up this SIP session connection for UE is, for follow-up reverse SRVCC handoff procedure is prepared, and before this reverse SRVCC handoff procedure carries out, this SIP session connection is not carried out the transmission of any speech data of UE, thus accordingly, SGSN also without the need to initiating the RAB process of establishing of essence, thus can be avoided the waste of resource.And particularly, the method that UE sends above-mentioned indication information to SGSN see the description in above-described embodiment, can not repeat them here equally.

It should be noted that in addition, if above-mentioned in the attachment flow of SGSN, UE does not report its CodeC information supported in the network of PS territory to SGSN, alternatively, in the signalling interactive process of the SIP session establishment carried out at this step UE and SCC AS, UE can also consult UE this CodeC information at PS territory network with SCC AS, and is consulting successfully, by SCC AS, the CodeC information after negotiation is carried in sip response message, returns to UE.In addition, for identifying the information such as the destination address of the business transmission of UE in the network of PS territory, also can in this signalling interactive process, held consultation by UE and SCC AS, and by SCC AS, the address information after negotiation is carried in sip response message, collaborative CodeC information together, returns to UE.

Step 314, SCC AS returns call message by I/S-CSCF to ATCF; Can comprise the configuration information about UE in this call message, such as correlation terminal indicates number (Correlation-MSISDN is called for short C-MISDN);

SCC AS returns call message by I/S-CSCF to ATCF after completing the SIP session establishment request process that UE sends.Alternatively, in the call message returned, SCC AS can also will to distribute for UE, the C-MSISDN number corresponding with the SIP session that UE sets up returns to ATCF, and the special number will distributed for UE, such as rSRVCC Session Hand-off indicates (rSRVCC Access Transfer Update-Session Tranfer Identifier, be called for short rSRVCC ATU-STI) return this ATCF, the special number that ATCF returns SCC AS and C-MSISDN number are preserved, simultaneously, ATCF directly returns call message to UE, wherein do not carry the information that these are preserved, now, voice bearer between UE and ATGW is set up.

Step 315, UE and SCC AS is based upon the reserved VOIP voice bearer in the network of PS territory;

When UE is after the IMS flow process of PS territory network completes, alternatively, UE can also be based upon the reserved VOIP voice bearer in the network of PS territory with SCC AS, the foundation of concrete finger UE and SGSN, PS medium surface between SGW, PGW and ATGW completes, and this reserved VOIP voice bearer can be used in the process that follow-up reverse SRVCC switches.This reserved VOIP voice bearer set up in advance is in follow-up reverse SRVCC handoff procedure, and be in suspended state before the handover, and by setting up the VOIP voice bearer of this hang-up in advance, really initiate in the process of reverse SRVCC switching at UE, UE without the need to carrying out the foundation of VOIP voice bearer again, thus accelerates speed speech business being switched to PS territory network.

Step 316, UE initiates the audio call in CS territory, sets up the CS territory voice conversation between the UE of opposite end.

UE completes IMS registration in PS territory, after establishing the reserved VOIP voice bearer between SCC AS in advance, can CS territory voice conversation flow process conveniently, and send the audio call in CS territory to opposite end UE, thus set up CS territory voice conversation with opposite end UE.

It should be noted that, carry out in the process registered at the UE of the present embodiment in the network of PS territory, if what UE supported is DTM pattern, namely UE speech business can dissimilar by two kinds of being carried on CS territory and PS territory simultaneously on, in above-mentioned steps, UE can complete after UE sets up the voice conversation in CS territory in the network of CS territory in the registration that PS territory network carries out, namely UE first sets up normal voice conversation in the network of CS territory, resource again in the network of PS territory needed for UE distribution, speech business is carried in the network of CS territory, and there will not be the registration of new speech business to affect the appearance of the situation of the speech business in the network of former CS territory.

Fig. 4 is the signaling diagram of the processing method embodiment three of embodiment of the present invention reverse single wireless voice calling continuity.The reverse SRVCC handoff procedure of the present embodiment based on the UE described by above-described embodiment and signaling diagram registered in advance and carry out, and in the present embodiment, do not support DTM with UE or do not support UTMS pattern, and first network element in PS territory is ATCF/ATGW is example, idiographic flow UE being carried out to reverse SRVCC switching is described.It should be noted that, be for ATCF/ATGW for the first network element, in embodiments of the present invention, the process setting up forwarding channel between ATCF/ATGW and rSRVCC MSC can be controlled to set up by MME, or initiatively set up from HSS query-related information by rSRVCC MSC and form, only carried out concrete description to the process that MME controls to set up in the present embodiment, another process describes in detail in next embodiment.It should be noted that in addition, due in practical application, ATCF and ATGW is generally and is wholely set, and thus in the present embodiment, the first network element ATGW is described as ATCF/ATGW, represents other network elements and sends to the signaling message of ATGW can be delivered to by ATCF forwarding.

As shown in Figure 4, this method comprises the steps:

Step 400, UE carries out IMS registration and sets up SIP session in the network of PS territory, to make PS territory network in advance for UE Resources allocation information;

Step 401, UE initiates the audio call in CS territory, sets up the CS territory voice conversation between the UE of opposite end;

The detailed process of above-mentioned steps 400 can see the specific descriptions to a upper signaling diagram.UE, by before carrying out reverse SRVCC switching, carries out registering and set up SIP session connection in advance in the network of PS territory, makes PS territory network in advance for UE distributes reserved resource information.Further, on the basis of this pre-assigned resource information, UE can also in advance in the network of PS territory for reserved VOIP voice bearer is set up in speech business.And owing to not supporting DTM for UE in the present embodiment or not supporting that UTMS pattern is described, thus the registration process of UE in advance in the network of PS territory must be carried out before the voice conversation process of establishing of normal CS territory, to avoid occurring that the registration of new speech business affects the situation of the speech business in the network of former CS territory.

Step 402, RNS (Radio Network Subsystem is called for short RNS)/base station controller system (Base Station System is called for short BSS) sends handover request to service MSC;

In the present embodiment, because supposition UE does not support DTM or do not support UTMS pattern, namely UE only can support the voice bearer of a type simultaneously, thus initiate at RNS/BSS in the process of reverse SRVCC switching, only need switch the carrying of CS territory sound-type, thus in this step, RNS/BSS only need to service MSC and sends handover request.But it should be noted that, if in the present embodiment, UE supports DTM or supports UTMS pattern, in this step, RNS/BSS needs to send handover request to service MSC and SGSN simultaneously.

Optionally, BSS/RNS can when sending handover request to service MSC, reverse SRVCC indication information can also be carried in handover request, to inform that MME or rSRVCC MSC should switch to rSRVCC by service MSC, thus in follow-up flow process, MME can indication information and home subscriber server (Home Subscriber Server is called for short HSS) contact accordingly, thus obtains the identification information of corresponding SGSN.

Step 403, handover request is transmitted to rSRVCC MSC by service MSC;

Step 404, rSRVCC MSC forwards handover request to MME;

After service MSC receives the handover request of RNS/BSS, this handover request (rSRVCC CS to PS asks) is transmitted to rSRVCC MSC, and in order to respond this handover request, rSRVCC MSC is second information such as UE allocation address and/or port.

Step 405, MME sends the mark of the SGSN of identified query acquisition request UE service to HSS;

Step 406, HSS returns the mark of the SGSN corresponding with UE to MME;

After MME receives the handover request of rSRVCC MSC forwarding, corresponding ATCF/ATGW is addressed in order to enable rSRVCC MSC, with with the mutual address of ATCF/ATGW and/or port information, thus set up forwarding channel, MME needs the mark first getting the SGSN corresponding with UE from database HSS, thus the STN-SR information of UE in the network of PS territory and related voice beared information could be obtained from the SGSN of correspondence, to be addressed to corresponding ATCF/ATGW according to this STN-SR.

Thus, in the present embodiment, receive the handover request of rSRVCC MSC forwarding at MME after, identified query request message will be sent to HSS, this identified query request message is specifically as follows the request message of position updating request or other types, and in this identified query request message, carry the mark of UE, the mark of the SGSN that the UE that specifies belongs to is returned to indicate HSS.And HSS receives after this carries the position updating request of UE mark, in the local database the UE specified is inquired about, and corresponding with the UE SGSN mark inquired is returned to MME.Alternatively, in this identification request message that MME sends to HSS, rSRVCC indicator information can also be carried, to inform that this inquiry of HSS is in rSRVCC handover operation.

Step 407, MME obtains the contextual information of UE from SGSN;

MME, after getting the SGSN mark corresponding with UE, is addressed to corresponding SGSN, and carries out Signalling exchange with SGSN, to get the contextual information of UE from corresponding SGSN, and the STN-SR information registered in the network of PS territory comprising UE and CodeC information.

Step 408, MME indicates ENB to be that UE distributes access switchable resource;

Step 409, ENB sends confirmation to MME, confirms that access handover resource allocation completes;

Now, MME has obtained the contextual information of UE, alternatively, access in the network of PS territory smoothly to make UE, complete the access operation at PS territory network, MME can also indicate the ENB of PS territory network to be the resource that UE prepares access and switches at this moment, and after Resourse Distribute completes, ENB sends acknowledge message to MME, to inform that the access handover resource allocation prepared for UE completes.

Step 410, MME sends switching response message to rSRVCC MSC, wherein carries the contextual information of the UE got;

And send acknowledge message at ENB to MME, it is after the access handover resource allocation of UE completes that MME obtains cicada ENB, MME can return switching response message to rSRVCC MSC further, wherein be carried at the contextual information of the UE got from SGSN in above-mentioned steps 407, i.e. STN-SR and the CodeC information registered in registration process in advance, in the network of PS territory of UE, to be transmitted to rSRVCC MSC by switching response message by the context message of UE.Wherein, Codec information is optional information.Based on this CodeC information, rSRVCC MSC after forwarding channel between ATGW sets up, when forwarding the upstream voice data of UE to ATGW, can carry out corresponding encoding operation to upstream voice data, then the upstream voice data after coding is transmitted to UE.

Step 411, rSRVCC MSC returns switching response message by service MSC to RNS/BSS;

And in order to complete the access operation of UE in RNS/BSS as early as possible, rSRVCC MSC also will by MSC to forwarding this switching response message, to notify that the access handover resource allocation that RNS/BSS prepares for UE completes.

Step 412, rSRVCC MSC sends sip message to ATCF/ATGW, wherein carries the second information that rSRVC MSC distributes;

Step 413, ATCF/ATGW returns sip response message to rSRVC MSC, wherein carries the first information that ATCF/ATGW distributes;

Particularly, after rSRVCC MSC has known the contextual information of UE, due in the registration process in advance of UE, IMS registration has anchored in ATCF by UE, thus now rSRVCC MSC can this STN-SR information, be addressed directly to corresponding ATCF/ATGW, to carry out the mutual of address and/or port information with ATCF/ATGW, thus set up the forwarding channel between ATCF/ATGW.

Step 414, RNS/BSS sends switching command to UE;

Step 415, UE accesses in ENB;

Step 416, ENB sends handoff completion message to MME;

And while rSVCC MSC and ATCF/ATGW each other mutual address and/or port information, receive the switching response message of MSC transmission at RNS/BSS after, in order to complete the access of UE in the network of PS territory as early as possible, RNS/BSS will send switching command to UE, with the access operation indicating UE to carry out PS territory network (EUTRAN), thus the access switchable resource that UE utilizes ENB to distribute for UE, access to smoothly in ENB, namely access in the network of PS territory, complete the access process of network.And at UE after the access process of ENB completes, ENB sends handoff completion message to MME, to inform its message accessed in the network of PS territory of MME.

Until address between rSVCC MSC and ATCF/ATGW and/or port information complete alternately, and UE is after the access of ENB all completes, so far, new voice bearing path between UE and opposite end UE is set up, UE sends to the downstream voice data of opposite end UE can be by: the downlink voice bearer path of " UE-ENB-SGW-PGW-ATGW-rSVCC MSC opposite end UE " is sent to opposite end UE, the upstream voice data that opposite end UE sends to UE then can by contrary bearer path: " opposite end UE-rSVCC MSC-ATGW-PGW-SGW-ENB-UE " (as shown in the dashed path below step 416 in Fig. 4), be sent to UE.Even if thus territory flow path switch does not also start to carry out or also do not complete, and can carry out voice data communication by this bearer path yet, and without the need to interrupting speech business, ensure that the good continuity of speech business between UE and opposite end UE.Further, this bearer path is based upon UE and completes on the basis of PS territory network insertion, and the speech business thus based on now UE can also obtain good QoS of voice.

Step 417, ATCF/ATGW initiated domain flow path switch;

Step 418, after territory flow path switch completes, the resource of release shared by forwarding channel.

And successfully set up at bearer path, UE can utilize after this bearer path and opposite end UE carry out voice data communication, in embodiments of the present invention, in order to real, speech business between UE and opposite end UE is switched in the network of PS territory, alternatively, ATCF/ATGW can also initiated domain flow path switch.This territory flow path switch carries out on the basis that UE can carry out normal VOIP speech business with opposite end UE, thus the speed speed of territory flow path switch can't produce any impact to the continuity of the speech business of UE, particularly, the process of ATCF/ATGW initiated domain conversion can see following Fig. 5.And it should be noted that, if carry out in the registration process of PS territory network in advance at UE, UE does not carry out the register flow path of IMS, and at this moment before ATCF/ATGW initiated domain flow path switch, UE first must carry out the registration of IMS in the network of PS territory.

And after territory flow path switch completes, the new voice bearing path that UE can be set up by territory transfer process and opposite end UE carry out voice data communication, namely by the downlink voice bearer path of " UE-ENB-SGW-PGW-ATGW-opposite end UE " and the ascending voice bearer path (as shown in the dashed path below step 417 in Fig. 4) of " opposite end UE-ATGW-PGW-SGW-ENB-UE ", speech business is carried out with opposite end UE, thus now rSVCC MSC can fall resource shared by forwarding channel by Co ntrolled release, really to complete the flow process that reverse SRVCC switches.Particularly, the process of this resource release can be initiated by ATCF.

In addition also it should be noted that in the present embodiment, if UE is in advance in the registration process of PS territory network, in above-mentioned steps 315, do not set up the reserved VOIP voice bearer between SCC AS in advance, namely UE is not before reverse SRVCC handoff procedure, set up reserved VOIP voice bearer, in the present embodiment, send after handover request to MSC at the RNS/BSS of above-mentioned steps 402, the core network element in the network of PS territory will initiatively trigger the foundation of the VOIP voice bearer of UE in the network of PS territory.Particularly, the triggering of this VOIP voice bearer process of establishing can trigger immediately by SGSN, MSC, the ATCF in the network of PS territory or other core network element, after above-mentioned steps 402 and carry out.And compared to carrying out the scheme of reserved VOIP voice bearer foundation before reverse SRVCC handoff procedure, the scheme of the foundation of VOIP voice bearer just should be carried out in reverse SRVCC handoff procedure, avoid in the appearance that the situation just needing reserved related voice resource in the network of PS territory before reverse SRVCC switches also does not occur, thus avoid the wasting of resources in the network of PS territory.

The processing method of the reverse single wireless voice calling continuity of the present embodiment, before speech business being switched from CS territory network to PS territory network at UE, UE carries out IMS registration in advance and initiates the foundation of SIP session in the network of PS territory, with the bearing resource information making PS territory network in advance for UE distributes, and in the middle of process speech business switched from CS territory network to PS territory network at UE, the reserved beared information utilizing PS territory network in advance for UE distributes, the forwarding channel set up between the rSRVCC MSC in the CS territory network of speech data and the ATGW in PS network is controlled by MME, thus make really to initiate speech business from CS territory network to the switching of PS territory network as UE, and after accessing to PS territory network fast, UE can carry out the transmission of speech data with distant terminal soon by this forwarding channel set up, and completing without the need to the territory flow path switch of waiting for the long period, ensure that voice business continuity energy good in reverse SRVCC handoff procedure, further, this forwarding channel set up is based upon UE and completes on the basis of PS territory network insertion, thus the speech business carried out based on this forwarding channel can also obtain good QoS of voice.

Fig. 5 is the signaling diagram of territory flow path switch in the processing method of the reverse single wireless voice calling continuity of the embodiment of the present invention.Also the detailed process of the mutual address of rSRVCC MSC and ATGW and/port information is described in the signaling diagram of the present embodiment, as shown in Figure 5, on the basis of a upper embodiment, after in above-mentioned steps 411, rSRVCC MSC returns switching response message by service MSC to RNS/BSS, the territory flow path switch that the process of the mutual port of rSRVCC MSC and ATGW and/port information and ATCF initiate is specific as follows:

Step 500, rSRVCC MSC sends the sip message (INVITE) carrying C-MSISDN number and address and/or port information to ATCF;

Step 501, ATCF is configured ATGW according to receiving sip message;

Particularly, rSRVCC MSC, after be addressed to corresponding ATCF according to STN-SR information, will distribute to the address of UE and/or port information and the C-MSISDN number that gets in advance together carries in a sip message, sends to ATCF.The SIP session that this C-MSISDN number and UE set up in advance is associated, and ATCF can search out the SIP session corresponding with UE according to this C-MSISDN number.

After ATCF receives sip message, use C-MSISDN to be associated with the session needing transfer, then mutual with ATGW, thus upgrade medium surface, by the voice bearer set up in advance and newly-built carrying, the newly-built bearing association namely between rSRVCC MSC and ATGW is to together.

Step 502, ATGW returns configuration response message (Configure ATGW Acknowledgment) to ATCF; Wherein by ATGW in advance for UE distribute address and/or port information send to ATCF

Step 503, ATCF returns sip response message to rSRVCC MSC, wherein carries address and/or the port information of ATGW;

Step 504, ATCF sends access to SCC AS and switches amendment (Access Tranfer Update) message;

Step 505, SCC AS forwards amendment message to opposite end UE;

After receiving CS to PS and accessing transforming message, ATCF re-establishes and SCC AS session, informs that CS to PS access conversion occurs SCC AS simultaneously.SCC AS uses rSRVCC ATU-STI to navigate to associated session, and sets up a new session at ATCF and SCC AS.The simultaneously SIP session association newly-built session and UE set up in advance in registration process of SCC AS, this is operation associated is realized by C-MSISDN usually.

Optionally, the medium surface of SCC AS to opposite end UE upgrades, and makes opposite end UE can directly send speech data to ATGW.Meanwhile, opposite end UE directly can receive the speech data that ATGW sends.

Step 506, opposite end UE returns amendment response message to SCC AS;

Step 507, SCC AS returns access to ATCF and switches amendment response message;

Now, new voice bearing path between UE and opposite end UE is set up, and the new voice bearing path after the conversion of this territory is specially the downlink voice bearer path of " UE-ENB-SGW-PGW-ATGW-opposite end UE " and the ascending voice bearer path of " opposite end UE-ATGW-PGW-SGW-ENB-UE ".

Fig. 6 is the signaling diagram of the processing method embodiment four of embodiment of the present invention reverse single wireless voice calling continuity.The reverse SRVCC handoff procedure of the present embodiment based on the UE described by embodiment described in above-mentioned Fig. 3 and signaling diagram registered in advance and carry out, and in the present embodiment, support DTM with UE or support UTMS pattern, and first network element in PS territory is ATCF/ATGW is example, idiographic flow UE being carried out to reverse SRVCC switching is described.In the present embodiment, equally only concrete description has been carried out to the process of the forwarding channel that MME control is set up between ATCF/ATGW and rSRVCC MSC.It should be noted that in addition, the present embodiment and above-mentioned difference embodiment illustrated in fig. 4 are only that the UE of the present embodiment supports DTM or supports UTMS pattern, and the UE of above-described embodiment does not support DTM or support UTMS pattern, thus in the present embodiment, for with above-mentioned identical step embodiment illustrated in fig. 4, specifically can see the description of embodiment corresponding to above-mentioned Fig. 4.

As shown in Figure 6, this method comprises the steps:

Step 600, UE initiates the audio call in CS territory, sets up the CS territory voice conversation between the UE of opposite end;

Step 601, UE carries out IMS registration and sets up SIP session in the network of PS territory, to make PS territory network in advance for UE Resources allocation information;

Owing to supporting DTM for UE in the present embodiment or not supporting that UTMS pattern is described, thus the registration process of UE in advance in the network of PS territory can be carried out after the voice conversation process of establishing of normal CS territory, also there will not be the registration of new speech business to affect the situation of the speech business in the network of former CS territory.

Step 602, RNS/BSS sends handover request to service MSC and SGSN simultaneously;

Step 603, handover request is transmitted to rSRVCC MSC by service MSC;

Step 604, rSRVCC MSC forwards handover request to MME;

Step 605, the contextual information information of UE is carried at handover request and is transmitted to MME by SGSN;

Due in the present embodiment, UE supports DTM or UMTS pattern, and thus MME is without the need to by sending identified query request to HSS, to be obtained the mark of the SGSN corresponding with UE from HSS by this position updating request, thus is addressed to SGSN.In the present embodiment, SGSN is on the basis receiving the handover request that RNS/BSS sends, initiatively will forward the contextual information of UE to MME, thus MME is without the need to sending on the basis of identified query request to HSS, automatically can obtain the contextual information of UE registered in advance in the network of PS territory.

Step 606, MME indicates ENB to be that UE distributes access switchable resource;

Step 607, ENB sends confirmation to MME, confirms that access handover resource allocation completes;

Now, in order to make UE access in the network of PS territory, the access operation at PS territory network is completed, MME can indicate the ENB of PS territory network to be the resource that UE prepares access switching, and after Resourse Distribute completes, ENB sends acknowledge message to MME, to inform that the access handover resource allocation prepared for UE completes.

Step 608, MME sends switching response message to rSRVCC MSC, wherein carries the contextual information of UE;

Step 609, rSRVCC MSC sends sip message to ATCF/ATGW, wherein carries the second information that rSRVC MSC distributes;

Step 610, ATCF/ATGW returns sip response message to rSRVC MSC, wherein carries the first information that ATCF/ATGW distributes;

Step 611, rSRVCC MSC returns switching response message by service MSC to RNS/BSS;

Step 612, MME returns switching response message by SGSN to RNS/BSS;

Meanwhile, after above-mentioned steps 607, MME is learning that ENB is after the access handover resource allocation of UE completes, also will return switching response message to SGSN, to make SGSN that this switching response message is transmitted to RNS/BSS, to inform RNS/BSS in ENB for UE distributes access switchable resource information.

Step 613, RNS/BSS sends switching command to UE;

Step 614, UE accesses in ENB;

Step 615, ENB sends handoff completion message to MME;

Step 616, MME sends bearing modification request to ATCF/ATGW;

Step 617, ATCF/ATGW returns bearing modification response message to MME;

Until address between rSVCC MSC and ATCF/ATGW and/or port information complete alternately, and UE is after the access of ENB all completes, so far, new voice bearing path between UE and opposite end UE is set up, UE sends to the downstream voice data of opposite end UE can be by: the downlink voice bearer path of " UE-ENB-SGW-PGW-ATGW-rSVCC MSC opposite end UE " is sent to opposite end UE, the upstream voice data that opposite end UE sends to UE then can pass through contrary bearer path: " opposite end UE-rSVCC MSC-ATGW-PGW-SGW-ENB-UE " is sent to UE.Even if thus territory flow path switch does not also start to carry out or also do not complete, and can carry out voice data communication by this bearer path yet, and without the need to interrupting speech business, ensure that the good continuity of speech business between UE and opposite end UE.Further, this bearer path is based upon UE and completes on the basis of PS territory network insertion, and the speech business thus based on now UE can also obtain good QoS of voice.

Step 618, ATCF/ATGW initiated domain flow path switch;

Step 619, after territory flow path switch completes, the resource of release shared by forwarding channel.

And successfully set up at bearer path, UE can utilize after this bearer path and opposite end UE carry out voice data communication, in embodiments of the present invention, in order to real, speech business between UE and opposite end UE is switched in the network of PS territory, alternatively, ATCF/ATGW can also initiated domain flow path switch.And after territory flow path switch completes, the new voice bearing path that UE can be set up by territory transfer process and opposite end UE carry out voice data communication, namely by the downlink voice bearer path of " UE-ENB-SGW-PGW-ATGW-opposite end UE " and the ascending voice bearer path of " opposite end UE-ATGW-PGW-SGW-ENB-UE ", speech business is carried out with opposite end UE, thus now rSVCC MSC can fall resource shared by forwarding channel by Co ntrolled release, really to complete the flow process that reverse SRVCC switches.Particularly, the process of this resource release can be initiated by ATCF.

Fig. 7 is the signaling diagram of the processing method embodiment five of embodiment of the present invention reverse single wireless voice calling continuity.The reverse SRVCC handoff procedure of the present embodiment based on the UE described by above-described embodiment and signaling diagram registered in advance and carry out, and in the present embodiment, do not support DTM with UE equally or do not support UTMS pattern, and first network element in PS territory is ATCF/ATGW is example, idiographic flow UE being carried out to reverse SRVCC switching is described.It should be noted that, be for ATCF/ATGW for the first network element, in embodiments of the present invention, the process setting up forwarding channel between ATCF/ATGW and rSRVCC MSC can be controlled to set up by MME, or initiatively set up from HSS query-related information by rSRVCC MSC and form, in the present embodiment, concrete description has been carried out to the process initiatively set up from HSS query-related information by rSRVCC MSC.It should be noted that in addition, due in practical application, ATCF and ATGW is generally and is wholely set, thus in the present embodiment, equally the first network element ATGW is described as ATCF/ATGW, represents other network elements and send to the signaling message of ATGW can be delivered to by ATCF forwarding.

As shown in Figure 7, this method comprises the steps:

Step 700, UE carries out IMS registration and sets up SIP session in the network of PS territory, to make PS territory network in advance for UE Resources allocation information;

Step 701, UE initiates the audio call in CS territory, sets up the CS territory voice conversation between the UE of opposite end;

Owing to not supporting DTM for UE in the present embodiment or not supporting that UTMS pattern is described, thus the registration process of UE in advance in the network of PS territory must be carried out before the voice conversation process of establishing of normal CS territory, to avoid occurring that the registration of new speech business affects the situation of the speech business in the network of former CS territory.

Step 702, RNS/BSS sends handover request to service MSC;

In the present embodiment, because supposition UE does not support DTM or do not support UTMS pattern, namely UE only can support the voice bearer of a type simultaneously, thus initiate at RNS/BSS in the process of reverse SRVCC switching, only need switch the carrying of CS territory sound-type, thus in this step, RNS/BSS only need to service MSC and sends handover request.Optionally, BSS/RNS when sending handover request to service MSC, can also carry reverse SRVCC indication information in handover request.

Step 703, handover request is transmitted to rSRVCC MSC by service MSC;

Step 704, rSRVCC MSC sends identified query request to HSS, wherein carries the mark of UE;

Step 705, HSS returns the mark of the SGSN corresponding with UE to rSRVCC MSC;

In the present embodiment, after rSRVCC MSC receives the handover request of service MSC forwarding, not by MME, but by sending the identified query request of carrying the mark of UE to HSS, directly inquire about the identification information obtaining the SGSN corresponding with UE from database HSS.This identified query request message is specifically as follows the request message of position updating request or other types.Alternatively, in this identification request message that MME sends to HSS, rSRVCC indicator information can also be carried, to inform that this inquiry of HSS is in rSRVCC handover operation.

Step 706, rSRVCC MSC forwards handover request to the SGSN specified;

Step 707, SGSN returns response message to rSRVCC MSC, wherein carries the contextual information of UE;

RSRVCC MSC is after getting the SGSN mark corresponding with UE, be addressed to corresponding SGSN, and forward handover request to SGSN, wherein can carry indication information, instruction SGSN returns the contextual information of UE, the STN-SR information registered in the network of PS territory comprising UE and CodeC information.

Step 708, SGSN forwards handover request to MME;

Step 709, MME indicates ENB to be that UE distributes access switchable resource;

Step 710, ENB sends confirmation to MME, confirms that access handover resource allocation completes;

While SGSN returns response message to rSRVCC MSC, handover request message is forwarded to MME, and in order to make UE access in the network of PS territory smoothly, complete the access operation at PS territory network, MME can also indicate the ENB of PS territory network to be the resource that UE prepares access switching at this moment, and after Resourse Distribute completes, ENB sends acknowledge message to MME, to inform that the access handover resource allocation prepared for UE completes.

Step 711, rSRVCC MSC sends sip message to ATCF/ATGW, wherein carries the second information that rSRVC MSC distributes;

Step 712, ATCF/ATGW returns sip response message to rSRVC MSC, wherein carries the first information that ATCF/ATGW distributes;

Meanwhile, after above-mentioned steps 707, rSRVCC MSC obtains the contextual information of UE, due in the registration process in advance of UE, IMS registration has anchored in ATCF by UE, and thus now rSRVCC MSC can STN-SR information in contextual information, is addressed directly to corresponding ATCF/ATGW, to carry out the mutual of address and/or port information with ATCF/ATGW, thus set up the forwarding channel between ATCF/ATGW.

Step 713, MME sends switching response message to rSRVCC MSC;

Step 714, rSRVCC MSC returns switching response message by service MSC to RNS/BSS;

Step 715, RNS/BSS sends switching command to UE;

Step 716, UE accesses in ENB;

Step 717, ENB sends handoff completion message to MME;

And while rSVCC MSC and ATCF/ATGW each other mutual address and/or port information, receive the switching response message of MGW transmission at RNS/BSS after, in order to complete the access of UE in the network of PS territory as early as possible, RNS/BSS will send switching command to UE, with the access operation indicating UE to carry out PS territory network (EUTRAN), thus the access switchable resource that UE utilizes ENB to distribute for UE, access to smoothly in ENB, namely access in the network of PS territory, complete the access process of network.And at UE after the access process of ENB completes, ENB sends handoff completion message to MME, to inform its message accessed in the network of PS territory of MME.

Step 718, ATCF/ATGW initiated domain flow path switch;

Step 719, after territory flow path switch completes, the resource of release shared by forwarding channel.

And after territory flow path switch completes, the new voice bearing path that UE can be set up by territory transfer process and opposite end UE carry out voice data communication, namely by the downlink voice bearer path of " UE-ENB-SGW-PGW-ATGW-opposite end UE " and the ascending voice bearer path of " opposite end UE-ATGW-PGW-SGW-ENB-UE ", speech business is carried out with opposite end UE, thus now rSVCC MSC can fall resource shared by forwarding channel by Co ntrolled release, really to complete the flow process that reverse SRVCC switches.Particularly, the process of this resource release can be initiated by ATCF.

In addition also it should be noted that in the present embodiment, if UE is in advance in the registration process of PS territory network, in above-mentioned steps 315, do not set up the reserved VOIP voice bearer between SCC AS in advance, namely UE is not before reverse SRVCC handoff procedure, set up reserved VOIP voice bearer, in the present embodiment, send after handover request to MSC at the RNS/BSS of above-mentioned steps 702, the core network element in the network of PS territory will initiatively trigger the foundation of the VOIP voice bearer of UE in the network of PS territory.Particularly, the triggering of this VOIP voice bearer process of establishing can trigger immediately by SGSN, MSC, the ATCF in the network of PS territory or other core network element, after above-mentioned steps 702 and carry out.

The processing method of the reverse single wireless voice calling continuity of the present embodiment, before speech business being switched from CS territory network to PS territory network at UE, UE carries out IMS registration in advance and initiates the foundation of SIP session in the network of PS territory, with the bearing resource information making PS territory network in advance for UE distributes, and in the middle of process speech business switched from CS territory network to PS territory network at UE, the reserved beared information utilizing PS territory network in advance for UE distributes, the forwarding channel initiatively set up between rSRVCC MSC and ATGW from HSS query-related information by the rSRVCC MSC in the network of CS territory, thus make really to initiate speech business from CS territory network to the switching of PS territory network as UE, and after accessing to PS territory network fast, UE can carry out the transmission of speech data with distant terminal soon by this forwarding channel set up, and completing without the need to the territory flow path switch of waiting for the long period, ensure that voice business continuity energy good in reverse SRVCC handoff procedure, further, this forwarding channel set up is based upon UE and completes on the basis of PS territory network insertion, thus the speech business carried out based on this forwarding channel can also obtain good QoS of voice.

Fig. 8 is that in the processing method of the reverse single wireless voice calling continuity of the embodiment of the present invention, user terminal carries out MS registration and sets up another signaling diagram of SIP session flow process before initiating reverse SRVCC and switching in PS territory.In the present embodiment signaling diagram, support DTM or UTMS pattern with UE, and first network element in PS territory is PGW is example, the idiographic flow carrying out IMS registration in advance to UE in the network of PS territory and set up SIP session is described.As shown in Figure 8, in the present embodiment, UE is before the reverse SRVCC switching flow of initiation, and the registration carried out in the network of PS territory and SIP session establishment flow process specifically comprise the steps:

Step 800, UE initiates the audio call in CS territory, sets up the CS territory voice conversation between the UE of opposite end;

Due in the present embodiment, support that DTM or UTMS pattern is described for UE, because UE can support the voice bearer in CS territory and the voice bearer in PS territory simultaneously, thus the IMS registration initiated in PS territory before reverse SRVCC switches of UE and SIP session establishment can initiate the audio call of CS territory network at UE, and the basis establishing CS territory voice conversation with opposite end UE is carried out.

Particularly, in the present embodiment, after UE completes the CS session establishment with opposite end UE by regular CS conversation procedure, the IMS registration of carrying out in the network of PS territory and SIP session establishment specifically can be divided into two processes.First process is the registration process in the network of PS territory that UE carries out on SGSN equipment, and the registration process of this PS territory network specifically can comprise following several step:

Step 801, UE sends attachment request to SGSN;

Step 802, SGSN returns attachment response to UE;

Step 803, UE sends main PDP activation request to SGSN;

Step 804, SGSN returns the response of main PDP activation to UE;

Step 805, UE sends secondary PDP activation request to SGSN;

Step 806, SGSN returns secondary PDP activation response to UE;

Wherein, in above-mentioned steps 805 and 806, UE carries out secondary PDP activation flow process on SGSN is optional step.Particularly, in the attachment request that UE sends to SGSN, UE can also be carried at code/decode type (CodeC) information giving tacit consent to support in the network of PS territory in attachment request, and based on this CodeC information, SGSN can learn the code/decode type that UE supports in the network of PS territory.

Further alternatively, in the main PDP activation request sent to SGSN at above-mentioned UE or secondary PDP activation request, UE can also carry indication information in main PDP activation request or secondary PDP activation request, to indicate the PGW acquisition address of SGSN to PS territory network and/or the first information of port.Thus SGSN is under the instruction of this indication information, instruction PGW is that UE distributes its resource information required in the network of PS territory, and returns to SGSN, and this first information can be used for the foundation of follow-up reverse SRVCC handoff procedure repeating passage.It should be noted that, in the first information, wherein PGW to be the port information that UE distributes can be one be exclusively used in during reverse SRVCC switches and set up the public port of forwarding channel, if this port is special public port, PGW is that this port information that UE distributes can also directly be configured on MME or rSRVCC MSC.

And after the registration completed on SGSN in the network of PS territory at UE, UE based on the information of this registration, SCC AS can carry out the registration of IMS further, and in this IMS registration process, SCC AS will distribute unique STN-SR information for UE.And UE also can initiate SIP session establishment process after completing IMS registration flow process on SCC AS, particularly, this SIP session establishment process specifically can comprise the steps:

Step 807, UE sends the request of SIP session establishment to SCC AS;

Step 808, SCC AS returns sip response message to UE, carries the resource information into UE distributes;

After UE completes the registration in PS territory on SGSN, further, UE can also initiate SIP session establishment process to SCC AS, by the SIP session establishment process between SCC AS, sets up a reserved SIP session connection in advance in the network of PS territory.Particularly, UE initiates the object of this SIP session establishment request and really is to set up SIP session with opposite end UE, this SIP session connection of setting up in advance is not initiated speech business from CS territory network to before the switching of PS territory network at UE, any Essential Action can not be played, it can be only for UE distributes corresponding resource in the server net of PS territory, and does not carry out the transmission of any data.But once UE has initiated the reverse SRVCC handoff procedure of speech business, in this reverse SRVCC handoff procedure, UE just can based on this pre-assigned resource, rapidly speech business is switched in the VOIP voice in PS territory, and carry out the territory flow path switch of follow-up speech business, thus without the need to initiating SIP session follow-up carrying out again in the process of territory conversion temporarily, set up VOIP voice bearer, thus be equivalent to the speed accelerating follow-up territory flow path switch.

Thus, in the SIP session establishment request that UE sends to SCC AS, UE can carry reverse SRVCC indication information, it is in follow-up reverse SRVCC switching flow that this reverse SRVCC indication information is used to indicate the SIP session that SCC AS now sets up, thus to indicate SCC AS when setting up SIP session according to this SIP session establishment request for UE, without the need to initiating real calling to opposite end UE, even and if be used to indicate SCC AS long-time in when this reserved SIP session connection does not have any data to transmit, also initiatively do not trigger the dispose procedure of the resource information of UE.In practical application, UE is carried above-mentioned reverse SRVCC indication information and specifically can be realized by following two kinds of modes in the SIP session establishment request sent to SCC AS: UE can carry separately an indication information in the request of SIP session establishment, such as rSRVCC indicator information; Or, carrying special called number in the SIP session establishment request that UE can also send to SCC AS, to indicate SCC AS when receiving the SIP session establishment request of carrying similar called number, learning that this SIP session is in switching for reverse SRVCC.

Step 809, UE is based upon the reserved VOIP voice bearer in the network of PS territory.

Further, after UE establishes SIP session on SCC AS, alternatively, UE can also in the network of PS territory in advance set up with SCC AS between, for carrying the reserved VOIP voice bearer of the VOIP speech business of UE, namely further in the server network element of PS territory for UE divides the reserved beared information being used in VOIP speech business.This reserved VOIP voice bearer set up in advance is in follow-up reverse SRVCC handoff procedure, and be in suspended state before the handover, and by setting up the VOIP voice bearer of this hang-up in advance, really initiate in the process of reverse SRVCC switching at UE, UE without the need to carrying out the foundation of VOIP voice bearer more temporarily, thus accelerates speed speech business being switched to PS territory network.

In addition it should be noted that, carry out in the process registered at the UE of the present embodiment in the network of PS territory, if what UE supported is non-DTM pattern, namely UE speech business can not dissimilar by two kinds of being carried on CS territory and PS territory simultaneously on, in above-mentioned steps, UE must complete before UE sets up the voice conversation in CS territory in the network of CS territory in the IMS registration that PS territory network carries out, namely the resource first in the network of PS territory needed for UE distribution, UE sets up normal voice conversation again in the network of CS territory, speech business is carried in the network of CS territory, thus avoid occurring that the registration of new speech business affects the appearance of the situation of the speech business in the network of former CS territory.

Fig. 9 is the signaling diagram of the processing method embodiment six of embodiment of the present invention reverse single wireless voice calling continuity.In the present embodiment, support DTM or UTMS pattern equally with UE, and first network element in PS territory is PGW is example, idiographic flow UE being carried out to reverse SRVCC switching is described.As shown in Figure 9, this method comprises the steps:

Step 900, UE initiates the audio call in CS territory, sets up the CS territory voice conversation between the UE of opposite end;

Step 901, UE carries out registering and sets up SIP session in the network of PS territory, to make PS territory network in advance for UE Resources allocation information;

The detailed process of above-mentioned steps can see the specific descriptions to a upper signaling diagram.UE is by before carrying out reverse SRVCC switching, carry out registering and set up SIP session connection in advance in the network of PS territory, make PS territory network in advance for UE distributes reserved resource information, further, based on this pre-assigned resource information, UE can also in advance in the network of PS territory for reserved VOIP voice bearer is set up in speech business.

Step 902, RNS/BSS sends handover request to service MSC and SGSN simultaneously;

Due in the present embodiment, assuming that UE supports DTM or supports UTMS pattern, namely support the voice bearer of two types simultaneously, thus initiate at RNS/BSS in the process of reverse SRVCC switching, the carrying of two types must switch by RNS/BSS simultaneously, concrete finger carries out the switching of CS speech business and PS speech business simultaneously, thus in this step, RNS/BSS needs to send handover request to MSC and SGSN simultaneously.It should be noted that, if in the present embodiment, UE does not support DTM pattern, and in this step, RNS/BSS only need to MSC and sends handover request.

Step 903, handover request is transmitted to rSRVCC MSC by service MSC;

Step 904, rSRVCC MSC is that UE distributes the second information, and is carried in handover request by the second information, is transmitted to MME;

For service MSC, in the present embodiment, after the handover request receiving RNS/BSS, this handover request is transmitted to rSRVCC MSC, notice rSRVCC MSC is the second information of UE allocation address and/or port.Thus according to this handover request, rSRVCC MSC learns that UE now needs speech business to be switched in the network of PS territory, thus rSRVCC MSC responds this handover request, for UE allocation address and/or port information, and the second information of the address of distribution and/or port is carried at handover request repeating to MME.

Step 905, the contextual information information of pre-assigned for the PGW first information and UE is carried at handover request and is transmitted to MME by SGSN;

And for SGSN, after receiving the handover request of RNS/BSS, equally this handover request is transmitted to MME, meanwhile, SGSN is also by the IMS registration process in the PS territory network that carries out in advance at UE, the contextual information that the address obtained from the first network element PGW and/or the first information of port and UE register in the network of PS territory, STN-SR and the CodeC information that such as UE registers in the network of PS territory, is carried at handover request repeating together to MME.

It should be noted that herein, if in the present embodiment, UE does not support DTM or does not support UTMS pattern, in this step, SGSN is on the basis not receiving the handover request that RNS/BSS sends, the contextual information of the first information and UE initiatively cannot be forwarded to MME, thus MME is in order to obtain above-mentioned information from SGSN, position updating request or other request messages will be sent to HSS, wherein carry the mark of UE, thus HSS can be identified according to the UE in position updating request, inquire the mark of corresponding SGSN, and feed back to MME, and then MME obtains contextual information and the first information of UE again in the SGSN of correspondence.

Step 906, MME indicates ENB to be that UE distributes access switchable resource;

Step 907, ENB sends confirmation to MME, confirms that access handover resource allocation completes;

Step 908, MME sends switching response message to rSRVCC MSC, wherein carries the first information of PGW distribution and the contextual information of UE;

MME is learning that ENB is after the access handover resource allocation of UE completes, switching response message is returned to MGW, wherein be carried at the first beared information that the PGW got from SGSN in above-mentioned steps 905 distributes to forwarding channel, and UE is in registration process in advance, the CodeC information registered in the network of PS territory, the second network element rSRVCC MSC is transmitted to the first information distributed by PGW, be equivalent to address and/or the port information of informing rSRVCC MSC first network element PGW, thus make when rSRVCC MSC receives the upstream voice data that opposite end UE sends to UE, can according to this address and/or port information, upstream voice data is transmitted exactly to the first network element PGW, so that this upstream voice data is sent in UE.And based on the CodeC information that UE registers in the network of PS territory, rSRVCC MSC before the upstream voice data forwarding UE to PGW, can also carry out corresponding encoding operation to upstream voice data, then the upstream voice data after coding is transmitted to UE.

Step 909, rSRVCC MSC returns switching response message by service MSC to RNS/BSS;

After rSRVCC MSC receives the switching response message of MME transmission, the beared information wherein carried is preserved, further, rSRVCC MSC forwards this switching response message to RNS/BSS, to complete flow process CS voice being switched to PS territory by service MSC.

Step 910, MME returns switching response message by SGSN to RNS/BSS;

Meanwhile, after above-mentioned steps 407, MME is learning that ENB is after the access handover resource allocation of UE completes, also will return switching response message to SGSN, to make SGSN that this switching response message is transmitted to RNS/BSS, to inform RNS/BSS in ENB for UE distributes access switchable resource information.

Step 911, RNS/BSS sends switching command to UE;

Step 912, UE accesses in ENB;

Step 913, ENB sends handoff completion message to MME;

After RNS/BSS receives this switching response message, send switching command, with the access operation indicating UE to carry out PS territory network to UE, thus the access switchable resource that UE utilizes ENB to distribute for UE, access to smoothly in ENB, namely access in the network of PS territory, complete the access process of network.And at UE after the access process of ENB completes, ENB sends handoff completion message to MME, to inform its message accessed in the network of PS territory of MME.

Step 914, MME sends bearing modification request to PGW, and carrying rSRVCC MSC is the second information that UE distributes;

Step 915, PGW returns bearing modification response message to MME;

After MME receives handoff completion message, the first network element PGW to PS territory network sends bearing modification request, wherein be carried in above-mentioned steps 404 from the second information that the second network element rSRVCC MSC gets, namely the bearer path of the speech business to UE is pointed to rSRVCC MSC by MME on PGW, PGW is transmitted to by the address and/or port information of rSRVCC MSC being distributed UE, the voice bearing path making PGW directly should point to opposite end UE is revised as and points to rSRVCC MSC, thus establishes the forwarding channel between PGW and rSRVCC MSC.Thus PGW by ENB receive UE send to the downstream voice data of opposite end UE time, be address and/or the port information of the VOIP voice bearer distribution of UE according to rSRVCC MSC, this downstream voice data can be transmitted to rSRVCC MSC exactly, and then send to opposite end UE.Further, the CodeC information that the UE got based on rSRVCC MSC in above-mentioned steps 408 registers in the network of PS territory, rSRVCC MSC is after the downstream voice data receiving the UE that PGW forwards, can also before this downstream voice data be sent to opposite end UE, corresponding decode operation is carried out to downstream voice data, more decoded downstream voice data is transmitted to opposite end UE.

So far, new voice bearing path between UE and opposite end UE is set up, UE sends to the downstream voice data of opposite end UE can be sent to opposite end UE by the downlink voice bearer path of " UE-ENB-SGW-PGW-rSRVCC MSC-service MSC-opposite end UE ", the upstream voice data that opposite end UE sends to UE then can by contrary bearer path: opposite end " UE-service MSC-rSRVCC MS-PGW-SGW-ENB-UE " (as shown in the dashed path below step 915 in Fig. 9), is sent to UE.Even if thus territory flow path switch does not also start to carry out or also do not complete, and can carry out voice data communication by this bearer path yet, and without the need to interrupting speech business, ensure that the good continuity of speech business between UE and opposite end UE.Further, this bearer path is based upon UE and completes on the basis of PS territory network insertion, and the speech business thus based on now UE can also obtain good QoS of voice.

In addition it should be noted that, DTM or UTMS pattern is supported because UE can be divided into, and do not support two types of DTM or UTMS pattern, although the present embodiment only supports DTM or UTMS pattern for UE, the process that reverse SRVCC switches is described, if but it is to be understood that UE does not support DTM or UTMS pattern, in embodiments of the present invention, this reverse SRVCC handoff procedure and UE support that the difference of DTM pattern is:

If UE does not support DTM or UTMS pattern, complete before the CS territory voice conversation that the UE IMS registration process of carrying out in PS territory must be set up between the UE of opposite end at UE in the network of CS territory before the handover; And in the process switched at reverse SRVCC, because UE can not support the voice bearer of two types simultaneously, thus, in above-mentioned steps 902, RNS/BSS only need initiate a handover request to service MSC, and without the need to sending twice handover request to SGSN and service MSC simultaneously.Now send handover request because SGSN does not receive RNS/BSS, the first information that PGW cannot distribute by SGSN and the contextual information that UE registers in the network of PS territory are carried at handover request and are transmitted to MME, thus MME also needs to send position updating request or other request message to HSS, to be got the SGSN preserving the information such as the above-mentioned first information from HSS by this position updating request, thus the civilian information of the upper limit that the first information distributed from the above-mentioned PGW of the SGSN active obtaining of correspondence, UE register in the network of PS territory.

Step 916, UE initiated domain flow path switch;

Step 917, after territory flow path switch completes, the resource of release shared by forwarding channel.

And successfully set up at bearer path, UE can utilize after this bearer path and opposite end UE carry out voice data communication, in embodiments of the present invention, switch in the network of PS territory in order to real by the speech business between UE and opposite end UE, alternatively, UE can also initiated domain flow path switch.This territory flow path switch carries out on the basis that UE can carry out normal VOIP speech business with opposite end UE, and thus the speed speed of territory flow path switch can't produce any impact to the continuity of the speech business of UE.And it should be noted that, if carry out in the registration process of PS territory network in advance at UE, UE does not carry out the register flow path of IMS, and at this moment before UE initiated domain flow path switch, UE first must carry out the registration of IMS in the network of PS territory.

And after territory flow path switch completes, the new voice bearing path that UE can be set up by territory transfer process and opposite end UE carry out voice data communication, namely by the downlink voice bearer path of " UE-ENB-SGW-PGW-opposite end UE " and the ascending voice bearer path (as shown in the dashed path below step 916 in Fig. 9) of " opposite end UE-PGW-SGW-ENB-UE ", speech business is carried out with opposite end UE, thus now SCC AS can fall resource shared by forwarding channel by Co ntrolled release, really to complete the flow process that reverse SRVCC switches.Particularly, the process of this resource release can by interoperability functional entity (Interworking Solution Function, IWS) initiate, the indication information that resource discharges is sent to MME by MSC by IWS, thus makes MME Co ntrolled release fall all resources of VOIP carrying.

The processing method of the reverse single wireless voice calling continuity of the present embodiment, before speech business being switched from CS territory network to PS territory network at UE, UE carries out IMS registration in advance and initiates the foundation of SIP session in the network of PS territory, with the bearing resource information making PS territory network in advance for UE distributes, and in the middle of process speech business switched from CS territory network to PS territory network at UE, the reserved beared information utilizing PS territory network in advance for UE distributes, the forwarding channel set up between rSRVCC MSC and PGW is controlled by MME, thus make really to initiate speech business from CS territory network to the switching of PS territory network as UE, and after accessing to PS territory network fast, UE can carry out the transmission of speech data with distant terminal soon by this forwarding channel set up, and completing without the need to the territory flow path switch of waiting for the long period, ensure that voice business continuity energy good in reverse SRVCC handoff procedure, further, this forwarding channel set up is based upon UE and completes on the basis of PS territory network insertion, thus the speech business carried out based on this forwarding channel can also obtain good QoS of voice.

One of ordinary skill in the art will appreciate that: all or part of step realizing said method embodiment can have been come by the hardware that program command is relevant, aforesaid program can be stored in a computer read/write memory medium, this program, when performing, performs the step comprising said method embodiment; And aforesaid storage medium comprises: ROM, RAM, magnetic disc or CD etc. various can be program code stored medium.

Figure 10 is the structural representation of embodiment of the present invention user terminal embodiment one.As shown in Figure 10, the user terminal of the present embodiment at least comprises resource information configuration module 11.Particularly, this resource information configuration module 11 for user terminal by speech business from CS territory network to before PS territory network switches, in the network of PS territory pre-configured voice business switch needed for resource information, this resource information is used in the process that speech business switches from CS territory network to PS territory network by user terminal.Particularly, utilize the resource information that these are pre-configured, forwarding channel can be set up between first network element and the second network element of CS territory network of PS territory network, and this forwarding channel is used for after user terminal accesses to PS territory network, forward the Voice traffic data between user terminal and peer user terminal.

Particularly, the specific works process involved by all modules in the present embodiment, the related content that can disclose with reference to the related embodiment involved by the processing method of above-mentioned reverse single wireless voice calling continuity, does not repeat them here.

The user terminal of the present embodiment, by before speech business is switched from CS territory network to PS territory network, be the bearing resource information of UE distribution in advance in the network of PS territory, thus in the middle of the process that speech business is switched from CS territory network to PS territory network, the reserved beared information making to utilize PS territory network in advance for UE distributes, forwarding channel can be set up between CS territory network and PS network, thus when UE really initiates speech business from CS territory network to the switching of PS territory network, and after accessing to PS territory network fast, UE can carry out the transmission of speech data with distant terminal soon by this forwarding channel, and completing without the need to the territory switching flow of waiting for the long period, ensure that voice business continuity energy good in reverse SRVCC handoff procedure, further, this forwarding channel is based upon UE and completes on the basis of PS territory network insertion, thus the speech business carried out based on this forwarding channel can also obtain good QoS of voice.

Figure 11 is the structural representation of embodiment of the present invention user terminal embodiment two.Particularly, in the present embodiment, the first network element in the network of PS territory is specifically as follows PGW or ATGW, and the second network element in the network of CS territory is then specifically as follows rSRVCC MSC.

As shown in figure 11, on the basis of a upper embodiment, in the user terminal of the present embodiment, alternatively, resource information configuration module specifically can comprise: IMS registration unit 111 and SIP session establishment unit 112.Wherein, IMS registration unit 111 for user terminal by speech business from CS territory network to before PS territory network switches, in the network of PS territory, carry out IMS registration; And SIP session establishment unit 112 for user terminal by speech business from CS territory network to before PS territory network switches, in the network of PS territory, set up SIP session.

Particularly, the first instruction subelement 1121 can also be comprised in SIP session establishment unit 112, this the first instruction subelement 1121 is in the SIP session establishment process of carrying out in SIP session establishment module 112, rSRVCC indication information is sent to SCC AS, this rSRVCC indication information is used to indicate SCC AS and now sets up SIP session in reverse SRVCC business switching, thus make SCC AS without the need to initiating audio call to peer user terminal, initiatively do not trigger the release flow process to pre-configured resource information yet.

Further alternatively, in the user terminal of the present embodiment, the second instruction subelement 1111 can also be comprised in IMS registration unit 111, this the second instruction subelement 111 is in the IMS registration flow process of carrying out in IMS registration module 111, send indication information to SGSN, this indication information is used to indicate SGSN and initiates speech business from CS territory network to the process of establishing not initiating RAB before the switching of PS territory network at user terminal.

Further, in the present embodiment, user terminal can also comprise VOIP voice bearer and set up module 12.This VOIP voice bearer sets up module 12 for after carrying out above-mentioned SIP session establishment flow process at SIP session establishment unit 112, initiate, by speech business from CS territory network to before the switching of PS territory network, in the network of PS territory, to set up the reserved VOIP voice bearer being used for speech business and switching in advance at user terminal; Or this VOIP voice bearer is set up module 12 and by speech business from CS territory network to after the switching of PS territory network, is set up the VOIP voice bearer being used for speech business and switching for initiating at user terminal in the network of PS territory.

The user terminal of the present embodiment, by before speech business is switched from CS territory network to PS territory network, IMS registration is carried out in advance in the network of PS territory, with the bearing resource making PS territory network in advance for UE distributes, thus in the middle of the process that speech business is switched from CS territory network to PS territory network, the reserved beared information making to utilize PS territory network in advance for UE distributes, forwarding channel can be set up between CS territory network and PS network, thus when UE really initiates speech business from CS territory network to the switching of PS territory network, and after accessing to PS territory network fast, UE can carry out the transmission of speech data with distant terminal soon by this forwarding channel, and completing without the need to the territory switching flow of waiting for the long period, ensure that voice business continuity energy good in reverse SRVCC handoff procedure, further, this forwarding channel is based upon UE and completes on the basis of PS territory network insertion, thus the speech business carried out based on this forwarding channel can also obtain good QoS of voice.

Figure 12 is the structural representation of the embodiment one of embodiment of the present invention mobile management entity.As shown in figure 12, the mobile management entity of the present embodiment at least comprises receiver module 21 and forwarding channel sets up module 22 two modules.Wherein, receiver module 21 is for receiving handover request, and the speech business of UE switches from CS territory network to PS territory network for asking by this handover request; Forwarding channel sets up module 22 for the process that speech business switched from CS territory network to PS territory network at UE, resource information needed for the speech business utilizing UE to configure in the network of PS territory in advance switches, sets up forwarding channel between the first network element of control PS territory network and the second network element of CS territory network.Particularly, forwarding channel set up above-mentioned forwarding channel that module 22 controls to set up for: after UE accesses to PS territory network, forward the Voice traffic data between UE and opposite end UE.

The mobile management entity of the present embodiment, by in the middle of the process that speech business switched from CS territory network to PS territory network at UE, utilize UE before speech business being switched from CS territory network to PS territory network, by the resource information configured in the network of PS territory in advance, control the forwarding channel set up between the CS territory network of speech data and PS network, thus when UE really initiates speech business from CS territory network to the switching of PS territory network, and after accessing to PS territory network fast, UE can carry out the transmission of speech data with distant terminal soon by this forwarding channel, and completing without the need to the territory switching flow of waiting for the long period, ensure that voice business continuity energy good in reverse SRVCC handoff procedure, further, this forwarding channel is based upon UE and completes on the basis of PS territory network insertion, thus the speech business carried out based on this forwarding channel can also obtain good QoS of voice.

Figure 13 is the structural representation of the embodiment two of embodiment of the present invention mobile management entity.Particularly, in the present embodiment, the first network element in the network of PS territory is specifically as follows ATGW or PGW, and the second network element in the network of CS territory is then specifically as follows rSRVCC MSC.UE is by IMS registration flow process and SIP session establishment flow process, and the resource information configured in the network of PS territory in advance at least can comprise the contextual information that UE registers in advance in the network of described PS territory, and this contextual information at least comprises STN-SR information.

On this basis, when the first network element be ATGW and UE support DTM or UMTS pattern time, forwarding channel sets up module 22 specifically can also comprise request reception unit 221 and information retransmission unit 222 two subelements.Wherein, request reception unit 221 for receive SGSN forward handover request, carry in this handover request UE registered in advance above-mentioned contextual information; Information retransmission unit 222, then for above-mentioned contextual information is transmitted to rSRVCC MSC, thus to make rSRVCC MSC be addressed to corresponding ATGW according to the STN-SR information of UE, and sets up forwarding channel with corresponding ATGW.

Further, when the first network element is ATGW and UE does not support DTM or UMTS pattern, forwarding channel is set up module 22 and specifically can also be comprised: identified query unit 223, information acquisition unit 224 and request-response unit 225 3 subelements.Particularly, the handover request of identified query unit 223 for forwarding according to the rSRVCC MSC received, the mark of the SGSN that inquiry is corresponding with UE in HSS; The mark of SGSN of information acquisition unit 224 for inquiring according to identified query unit 223, obtains the above-mentioned contextual information of UE registered in advance to the SGSN specified; Request-response unit 225 is then carried in switching response message for the STN-SR information in the contextual information that information acquisition unit 224 got and returns to rSRVCC MSC, to make rSRVCC MSC be addressed to corresponding ATGW according to described STN-SR information, and set up forwarding channel with corresponding ATGW.

Further, when the first network element is PGW, in the present embodiment, forwarding channel sets up module 22 specifically can also comprise acquisition of information retransmission unit 226.This acquisition of information retransmission unit 226 is for obtaining from PGW and rSRVCC MSC address and/or the port information that PGW and rSRVCC MSC distributes to UE respectively, and the address got respectively and/or port information are carried out alternately between PGW and rSRVCC MSC, to make to set up forwarding channel between PGW and rSRVCC MSC.

Particularly, the specific works process involved by all modules in the present embodiment, the related content that can disclose with reference to the related embodiment involved by the processing method of above-mentioned reverse single wireless voice calling continuity equally, does not repeat them here.

The mobile management entity of the present embodiment, by in the middle of the process that speech business switched from CS territory network to PS territory network at UE, utilize UE before speech business being switched from CS territory network to PS territory network, the resource information configured by the IMS registration of carrying out in the network of PS territory in advance, control the forwarding channel set up between the CS territory network of speech data and PS network, thus when UE really initiates speech business from CS territory network to the switching of PS territory network, and after accessing to PS territory network fast, UE can carry out the transmission of speech data with distant terminal soon by this forwarding channel, and completing without the need to the territory switching flow of waiting for the long period, ensure that voice business continuity energy good in reverse SRVCC handoff procedure, further, this forwarding channel is based upon UE and completes on the basis of PS territory network insertion, thus the speech business carried out based on this forwarding channel can also obtain good QoS of voice.

Figure 14 is the structural representation of the treatment system embodiment of embodiment of the present invention reverse single wireless voice calling continuity.As shown in figure 14, the treatment system of the reverse voice call continuity service of the present embodiment at least comprises user terminal 1, first network element 2 and the second network element 3.

Particularly, user terminal 1 for by speech business from CS territory network to before PS territory network switches, pre-configured resource information in the network of PS territory; And the first network element 2 is arranged in PS territory network, the second network element 3 is arranged in CS territory network, and the first network element 2 is specifically as follows PGW or the ATGW equipment in the network of PS territory, and the second network element 3 is specifically as follows the rSRVCC MSC equipment in the network of CS territory.The process that speech business switches from CS territory network to PS territory network by user terminal 1, utilize the above-mentioned resource information that user terminal 1 is pre-configured, forwarding channel can be set up between first network element 2 and the second network element 3, this forwarding channel is used for after user terminal 1 accesses to PS territory network, forwards the Voice traffic data between user terminal 1 and peer user terminal.

Particularly, all modules that user terminal in the present embodiment comprises, and the specific works process involved by the module comprised, the related content that can disclose with reference to the related embodiment involved by the processing method of the reverse continuous voice call of above-mentioned single wireless, user terminal and mobile management entity, does not repeat them here.

The treatment system of the reverse single wireless voice calling continuity of the present embodiment, before speech business being switched from CS territory network to PS territory network at UE, UE carries out IMS registration in advance and initiates the foundation of SIP session in the network of PS territory, with the bearing resource information making PS territory network in advance for UE distributes, and in the middle of process speech business switched from CS territory network to PS territory network at UE, the reserved beared information utilizing PS territory network in advance for UE distributes, set up the forwarding channel between the CS territory network of speech data and PS network, thus make really to initiate speech business from CS territory network to the switching of PS territory network as UE, and after accessing to PS territory network fast, UE can carry out the transmission of speech data with distant terminal soon by this forwarding channel set up, and completing without the need to the territory flow path switch of waiting for the long period, ensure that voice business continuity energy good in reverse SRVCC handoff procedure, further, this forwarding channel set up is based upon UE and completes on the basis of PS territory network insertion, thus the speech business carried out based on this forwarding channel can also obtain good QoS of voice.

Further, on the basis of technique scheme, in the treatment system of the reverse voice call continuity service of the present embodiment, mobile management entity 4 can also be comprised.Mobile management entity 4, for the process that speech business switched from CS territory network to PS territory network at user terminal 1, utilizes the resource information that user terminal 1 is pre-configured, controls to set up described forwarding channel between the first network element 2 and the second network element 3.And particularly, all modules that mobile management entity in the present embodiment comprises, and the specific works process involved by the module comprised, the related content that can disclose with reference to the related embodiment involved by the processing method of above-mentioned reverse single wireless voice calling continuity, user terminal and mobile management entity equally, does not repeat them here.

Last it is noted that above embodiment is only in order to illustrate technical scheme of the present invention, be not intended to limit; Although with reference to previous embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein portion of techniques feature; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the spirit and scope of various embodiments of the present invention technical scheme.

Claims

1. a processing method for reverse single wireless voice calling continuity, is characterized in that, comprising:

2. the processing method of reverse single wireless voice calling continuity according to claim 1, is characterized in that:

Described first network element is territory transfer gateway ATGW or grouped data network gateway PGW, and described second network element is the mobile switching centre rSRVCC MSC supporting reverse single wireless voice calling continuity business.

3. the processing method of reverse single wireless voice calling continuity according to claim 2, it is characterized in that, describedly utilize pre-configured described resource information, between first network element and the second network element of described circuit domain of described packet-switched domain, set up forwarding channel specifically comprise:

Mobile management entity MME utilizes pre-configured described resource information, controls to set up described forwarding channel between the first network element of described packet-switched domain and the second network element of described circuit domain.

4. the processing method of reverse single wireless voice calling continuity according to claim 3, is characterized in that:

Described resource information at least comprises the contextual information that described user terminal is registered in advance in described packet-switched domain network, and described contextual information at least comprises the session translation number STN-SR information for reverse voice call continuity service;

If described first network element is described ATGW and described user terminal supports dual-transfer mode DTM or universal mobile telecommunications system UMTS pattern, described MME utilizes pre-configured described resource information, controls to set up described forwarding channel between the first network element of described packet-switched domain and the second network element of described circuit domain and specifically comprises:

Described MME receives the handover request that Serving GPRS Support Node forwards, and carries the described contextual information of described user terminal registered in advance in described handover request;

Described contextual information is transmitted to described rSRVCC MSC by described MME, to make described rSRVCC MSC be addressed to corresponding ATGW according to the described STN-SR information in described contextual information, and sets up described forwarding channel with corresponding ATGW.

5. the processing method of reverse single wireless voice calling continuity according to claim 3, is characterized in that:

Described resource information at least comprises the contextual information that described user terminal is registered in advance in described packet-switched domain network, and described contextual information at least comprises STN-SR information;

If described first network element is described ATGW and described user terminal does not support DTM or UMTS pattern, described MME utilizes pre-configured described resource information, controls to set up described forwarding channel between the first network element of described packet-switched domain and the second network element of described circuit domain and specifically comprises:

The handover request that described MME forwards according to the described rSRVCC MSC received, the mark of the Serving GPRS Support Node that inquiry is corresponding with described user terminal in home subscriber server HSS;

Described MME, according to the mark of the described Serving GPRS Support Node inquired, obtains the described contextual information of described user terminal registered in advance to the Serving GPRS Support Node of specifying;

STN-SR information in described contextual information is carried in switching response message and returns to described rSRVCC MSC by described MME, to make described rSRVCC MSC be addressed to corresponding ATGW according to the described STN-SR information in described contextual information, and set up described forwarding channel with corresponding ATGW.

6. the processing method of reverse single wireless voice calling continuity according to claim 2, is characterized in that:

If described first network element is described ATGW and described user terminal does not support DTM or UMTS pattern, describedly utilize pre-configured described resource information, between first network element and the second network element of described circuit domain of described packet-switched domain, set up forwarding channel specifically comprise:

After described rSRVCC MSC receives handover request, the mark of the Serving GPRS Support Node that inquiry is corresponding with described user terminal in HSS;

Described rSRVCC MSC is according to the mark of the described Serving GPRS Support Node inquired, forward described handover request by the Serving GPRS Support Node of specifying to MME, and obtain the described contextual information of described user terminal registered in advance to described Serving GPRS Support Node of specifying;

Described rSRVCC MSC is addressed to corresponding ATGW according to the STN-SR information in described contextual information, and sets up described forwarding channel with corresponding ATGW.

7. the processing method of reverse single wireless voice calling continuity according to claim 3, it is characterized in that, if described first network element is described PGW, described MME utilizes pre-configured described resource information, controls to set up forwarding channel between the first network element of described packet-switched domain and the second network element of described circuit domain and specifically comprises:

Described MME obtains from described PGW and described rSRVCC MSC address and/or the port information that described PGW and described rSRVCC MSC distributes to described user terminal respectively, and the address got respectively and/or port information are carried out alternately between described PGW and described rSRVCC MSC, to make to set up described forwarding channel between described PGW and described rSRVCC MSC.

8. according to the processing method of the arbitrary described reverse single wireless voice calling continuity of claim 1 ~ 7, it is characterized in that, described user terminal by speech business from circuit-domain network to before packet-switched domain network switches, in described packet-switched domain network pre-configured voice business switch needed for resource information specifically comprise:

Described user terminal by speech business from circuit-domain network to before packet-switched domain network switches, in described packet-switched domain network, carry out IMS registration and set up SIP session, with described resource information pre-configured in described packet-switched domain network.

9. the processing method of reverse single wireless voice calling continuity according to claim 8, is characterized in that, described method also comprises:

Described user terminal is in described SIP session establishment process, reverse single wireless voice calling continuity rSRVCC indication information is sent to service set and continuous application server S CC AS, described rSRVCC indication information information is used to indicate SIP session described in described SCC AS in reverse voice call continuity service switching, to make described SCC AS without the need to initiating audio call to described peer user terminal, and initiatively do not trigger the release flow process to pre-configured described resource information.

10. the processing method of reverse single wireless voice calling continuity according to claim 8, is characterized in that, described method also comprises:

Described user terminal is in described IMS registration process, send indication information to Serving GPRS Support Node, described indication information is used to indicate described Serving GPRS Support Node and initiates speech business from circuit-domain network to the process of establishing not initiating RAB before the switching of packet-switched domain network at described user terminal.

The processing method of 11. reverse single wireless voice calling continuities according to claim 8, is characterized in that, described method also comprises:

Described user terminal after the process of establishing of described SIP session, by speech business from circuit-domain network to before the switching of packet-switched domain network, in described packet-switched domain network, setting up the reserved VOIP voice bearer being used for speech business and switching in advance;

Or, described user terminal in initiation by speech business from circuit-domain network to after the switching of packet-switched domain network, in described packet-switched domain network, set up the VOIP voice bearer being used for speech business and switching.

12. 1 kinds of user terminals, is characterized in that, comprising:

13. user terminals according to claim 12, is characterized in that:

14. user terminals according to claim 12 or 13, it is characterized in that, described resource information configuration module specifically comprises:

IMS registration unit, for described user terminal by speech business from circuit-domain network to before packet-switched domain network switches, in described packet-switched domain network, carry out IMS registration;

SIP session establishment unit, for described user terminal by speech business from described circuit-domain network to before described packet-switched domain network switches, in described packet-switched domain network, set up SIP session.

15. user terminals according to claim 14, is characterized in that, described SIP session establishment unit at least comprises:

First instruction subelement, for in described SIP session establishment process, reverse single wireless voice calling continuity rSRVCC indication information is sent to service set and continuous application server S CC AS, described rSRVCC indication information information is used to indicate SIP session described in described SCC AS in reverse voice call continuity service switching, to make described SCC AS without the need to initiating audio call to described peer user terminal, and initiatively do not trigger the release flow process to pre-configured described resource information.

16. user terminals according to claim 14, is characterized in that, described IMS registration unit at least comprises:

Second instruction subelement, for in described IMS registration flow process, send indication information to Serving GPRS Support Node, described indication information is used to indicate described Serving GPRS Support Node and initiates speech business from circuit-domain network to the process of establishing not initiating RAB before the switching of packet-switched domain network at described user terminal.

17. user terminals according to claim 14, is characterized in that, also comprise:

VOIP voice bearer sets up module, after carrying out the foundation of described SIP session at described SIP session establishment unit, to initiate speech business, from circuit-domain network to before the switching of packet-switched domain network, in described packet-switched domain network, to set up the reserved VOIP voice bearer being used for speech business and switching in advance at described user terminal; Or, to initiate speech business, from circuit-domain network to after the switching of packet-switched domain network, in described packet-switched domain network, to set up the VOIP voice bearer being used for speech business and switching at described user terminal.

18. 1 kinds of mobile management entities, is characterized in that, comprising:

Forwarding channel sets up module, for according to described handover request, the process that speech business switches from circuit-domain network to packet-switched domain network by described user terminal, resource information needed for the speech business utilizing described user terminal to configure in described packet-switched domain network in advance switches, control to set up forwarding channel between the first network element of described packet-switched domain network and the second network element of described circuit-domain network, described forwarding channel is used for after described user terminal accesses to described packet-switched domain network, forward the Voice traffic data between described user terminal and peer user terminal.

19. mobile management entities according to claim 18, is characterized in that:

20. mobile management entities according to claim 19, is characterized in that:

If described first network element is described ATGW and described user terminal supports dual-transfer mode DTM or universal mobile telecommunications system UMTS pattern, described forwarding channel is set up module and is specifically comprised:

Request reception unit, for receiving the described handover request that Serving GPRS Support Node forwards, carries the described contextual information of described user terminal registered in advance in described handover request;

Information retransmission unit, for described contextual information is transmitted to described rSRVCC MSC, to make described rSRVCC MSC be addressed to corresponding ATGW according to the described STN-SR information in described contextual information, and sets up described forwarding channel with corresponding ATGW.

21. mobile management entities according to claim 19, is characterized in that:

If described first network element is described ATGW and described user terminal does not support DTM or UMTS pattern, described forwarding channel is set up module and is specifically comprised:

Identified query unit, for the described handover request forwarded according to the described rSRVCC MSC received, the mark of the Serving GPRS Support Node that inquiry is corresponding with described user terminal in home subscriber server HSS;

Information acquisition unit, for the mark according to the described Serving GPRS Support Node inquired, obtains the described contextual information of described user terminal registered in advance to the Serving GPRS Support Node of specifying;

Request-response unit, described rSRVCC MSC is returned to for the STN-SR information in described contextual information being carried in switching response message, to make described rSRVCC MSC be addressed to corresponding ATGW according to described STN-SR information, and set up described forwarding channel with corresponding ATGW.

22. mobile management entities according to claim 19, is characterized in that, if described first network element is described PGW, described forwarding channel is set up module and also comprised:

Acquisition of information retransmission unit, for obtaining from described PGW and described rSRVCC MSC address and/or the port information that described PGW and described rSRVCC MSC distributes to described user terminal respectively, and the address got respectively and/or port information are carried out alternately between described PGW and described rSRVCC MSC, to make to set up described forwarding channel between described PGW and described rSRVCC MSC.

The treatment system of 23. 1 kinds of reverse single wireless voice calling continuities, is characterized in that, comprising: user terminal, the first network element and the second network element; Wherein,

Described user terminal be used for by speech business from circuit-domain network to before packet-switched domain network switches, in described packet-switched domain network pre-configured voice business switch needed for resource information;

Described first network element is arranged in packet-switched domain network, described second network element is arranged in circuit-domain network, the process that speech business switches from circuit-domain network to packet-switched domain network by described user terminal, utilize pre-configured described resource information, forwarding channel can be set up between first network element of described packet-switched domain and the second network element of described circuit domain, described forwarding channel is used for after described user terminal accesses to described packet-switched domain network, forwards the Voice traffic data between described user terminal and peer user terminal.

The treatment system of 24. reverse single wireless voice calling continuities according to claim 23, is characterized in that:

The treatment system of 25. reverse single wireless voice calling continuities according to claim 23 or 24, it is characterized in that, described system also comprises:

Mobile management entity, for the process that speech business switched from circuit-domain network to packet-switched domain network at described user terminal, utilize pre-configured described resource information, control to set up described forwarding channel between the first network element of described packet-switched domain and the second network element of described circuit domain.