CN107635217A - A kind of improved eSRVCC switching methods and device - Google Patents
A kind of improved eSRVCC switching methods and device Download PDFInfo
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Abstract
The invention discloses a kind of improved eSRVCC switching methods and device, it is related to mobile communication technology field, its method includes：The SIP that LTE network is initiated according to call subscriber terminal is called, and establishes the LTE carryings that VoLTE is carried out for call subscriber terminal and called user terminal；LTE network establishes the standby carrying from ATGW to the IM MGW in master home domain after LTE carryings are established；During call subscriber terminal and called user terminal carry progress VoLTE via the LTE, when if desired carrying the VoLTE by circuit domain, the carrying foundation of circuit domain side and renewal are completed using the standby carrying, and the VoLTE is continued by the carrying of circuit domain side.The present invention effectively increases handover delay, improves Consumer's Experience.
Description
Technical field
Mobile communication technology field of the present invention, more particularly to a kind of improved eSRVCC (enhanced Single Radio
Voice Call Continuity, the single wireless voice calling continuity of enhancing) switching method and device.
Background technology
At present, LTE (Long Term Evolution, Long Term Evolution) network Development enters voice and multimedia introduces rank
Section, LTE wireless coverages are gradually perfect, and IMS (IP Multimedia Subsystem, IP multimedia system) network starts to dispose.
This stage can not only enjoy broadband services by LTE terminal, and (i.e. VoLTE (the Voice that can be made a phone call by LTE network
Over LTE) speech business), enjoy abundant IMS multimedia services.
But because LTE network covering is still not perfect enough, the traditional language provided using CS is stilled need outside LTE wireless coverages
Sound business is supplemented.Now use SRVCC (Single Radio Voice Call Continuity, single wireless voice
Call continuity)/eSRVCC schemes can solve the problem that and Voice command and be moved to CS (Circuit Switching, circuit switching)
Voice continuity problem during network switching, terminal, using VoLTE speech businesses, are believed in LTE network when roaming into no LTE
Number area when, be switched to conventional CS network provide voice service.
Terminal synchronization can only reside in LTE or 2G/3G networks；The LTE areas of coverage, LTE is as access passage, voice industry
Business is controlled by IMS, and data service is also dredged by LTE；When being covered without LTE, through MSC Server (Mobile Switching
Center Server, Mobile Switching Center Server) and MME (Mobility Management Entity, mobile management
Entity) between Sv interfaces transmission handover request, perform SRVCC/eSRVCC flows, fall back to 2G/3G networks, keep business continuity
Property.
SRVCC:Mainly solve, when injection frequency UE is moved between LTE/Pre-LTE networks and 2G/3G networks, how to protect
The problem of holding voice business continuity, that is, VoIP (the Voice over Internet that injection frequency UE controls in IMS
Protocol, the networking telephone) seamless switching between voice and CS voices.
SRVCC switching flow description：
The wireless signal measurement report that 1.eNodeB (evolved NodeB, evolved NodeB) is sent according to UE, decision-making
Initiate handoff procedure；
2.MME to eMSC (enhanced MSC, enhanced MSC) initiate PS (Packet Switching, packet switch) to
CS handover request；
3.eMSC initiates switching to purpose MSC and prepares message；
4. handover request and response between the MSC and wireless side of mesh；
5.eMSC and purpose MSC, which is established, to be carried；
6.eMSC initiates session establishment request to IMS domain, and called number is STN-SR (Session Transfer
Number Single-Radio, conversation shift number), calling number is MSISDN (Mobile Station Integrated
Services Digital Network number, mobile station comprehensive service digital net number), session is routed to SCC AS
(Service Centralization and Continuity Application Server, application server for continuity)；
7-1.SCC AS initiate session distal end UE media address renewal, the media address of distal end UE switchings opposite end to MGW
(Media Gateway, WMG)；
7-2.SCC AS discharge IMS session branch；
8.eMSC sends PS->CS handoff responses, eNodeB send switching command；
9. terminal access UTRAN (Universal Terrestrial Radio Access Network, general land without
Line access network)/GERAN (GSM EDGE Radio Access Network, GSM EDGE Radio Access Network), with purpose
MSCS (Management Scheduling and Control System, management and dispatching and control system) establishes carrying.
But because SRVCC handover delay is longer, reach 200-500ms, and variation is larger, can not meet language substantially
The demand of sound business.The time of traditional 2G/3G switchings is about 90-200ms.
To solve these problems existing for SRVCC technologies, eSRVCC technologies are introduced in 3GPP R10.
eSRVCC:ESRVCC schemes are further increased in SRVCC schemes, by increasing ATCF in visited place
(Access Transfer Control Functionality, access switching control function) (chain of command) and ATGW with
(ATGW, Access Transfer Gateway, access transfer gateway) (medium surface) logic function, Media Stream is anchored on
In VPLMN (Virtual Public Land Mobile Network, virtual public land mobile network), SRVCC so occurs
During switching, VPLMN with regard to can complete LTE to CS switching media access process of reconstruction, can effectively reduce handover delay.
In eSRVCC handover schemes, by targets of the eMSC of visited network as switching, the eMSC of visited network is switching
Shi Faqi to ATCF (Acess Transfer Control Functionality, access transfer control function) calling.
Carrying between ATGW and IM-MGW (IP Multimedia Media Gateway, IP multimedia gateway) is occurred in switching
Shi Caihui updates, therefore for the UE of high-speed motion, switching time or long.
The content of the invention
The technical problem that the scheme provided according to embodiments of the present invention solves is that existing eSEVCC switchings are in visit net
The eMSC of network initiates the calling to ATCF in switching, and the carrying between ATGW and IM-MGW is just can be more when switching and occurring
Newly, cause time delay longer.
A kind of improved eSRVCC switching methods provided according to embodiments of the present invention, including：
SIP (Session Initiation Protocol, the conversation initial that LTE network is initiated according to call subscriber terminal
Agreement) calling, establish the LTE carryings that VoLTE is carried out for call subscriber terminal and called user terminal；
LTE network is established from ATGW to the IM-MGW in master home domain standby carrying after LTE carryings are established；
During call subscriber terminal and called user terminal carry progress VoLTE via the LTE, if desired by circuit
When domain carries the VoLTE, the carrying foundation of circuit domain side and renewal are completed using the standby carrying, and hold by circuit domain side
Load continues the VoLTE.
Preferably, include before the SIP callings that the call subscriber terminal is initiated：
The eMSC addresses of one ownership circuit domain of call subscriber terminal signing, and LTE nets are arrived into eMSC addresses storage
The HSS (Home Subscriber Server, home subscriber server) of network；
The HSS will be inserted into visit MME under eMSC numbers that call subscriber terminal is contracted.
Preferably, the HSS will be inserted into visit MME and include under eMSC numbers that call subscriber terminal is contracted：
The HSS visits the more new position request of MME transmissions according to call subscriber terminal, and renewal position is sent to visit MME
Response is put, and visit MME will be inserted under the call subscriber terminal signing eMSC numbers of carrying.
Preferably, standby carrying of the foundation from ATGW to the IM-MGW in master home domain includes：
Call subscriber terminal is anchored to ATGW by LTE network after LTE carryings are established；
The visit MME of LTE network utilizes the eMSC numbers of HSS underthrusts, eMSC addresses is obtained, so as to via LTE network
EMSC establishes the standby carrying of the IM-MGW from the ATGW of institute's grappling to master home domain.
Preferably, the eMSC via LTE network establishes the IM-MGW's from the ATGW of institute's grappling to master home domain
Standby carrying includes：
What the eMSC reception visits MME of LTE network was sent includes STN-SR (Session Transfer Number
Single-Radio, conversation shift number) and C-MSISDN (Correlation-MSISDN, the MSISDN of association) parameter pre-cut
Change request；
The eMSC of LTE network asks according to the pre-switch, and it is whole to send addition IMS side IP to the IM-MGW in master home domain
The request at end；
The IM-MGW in the master home domain of LTE network includes IP terminal parameter information by being returned to eMSC, makes eMSC roots
STN-SR the and C-MSISDN parameters included in being asked according to pre-switch are route, and are sent out to the ATGW of call subscriber terminal grappling
Send eSRVCC handover request message；
The ATGW of LTE network according to eSRVCC handover request message, hold by the standby of IM-MGW established to master home domain
Carry.
A kind of improved eSRVCC switchings realization device provided according to embodiments of the present invention, including：
LTE carrier modules are established, the SIP initiated for LTE network according to call subscriber terminal is called, and is established for caller
The LTE that user terminal carries out VoLTE with called user terminal is carried；
Standby carrier module is established, for LTE network after LTE carryings are established, is established from ATGW to master home domain
IM-MGW standby carrying；
Handover module, the VoLTE phases are carried out for being carried in call subscriber terminal and called user terminal via the LTE
Between, when if desired carrying the VoLTE by circuit domain, the carrying foundation of circuit domain side and renewal are completed using the standby carrying,
And the VoLTE is continued by the carrying of circuit domain side.
Preferably, in addition to：
Call subscriber terminal, arrived for the eMSC addresses for an ownership circuit domain of contracting, and by eMSC addresses storage
The HSS of LTE network, visit MME is inserted under the eMSC numbers contracted so as to the HSS.
Preferably, in addition to underthrust unit, the renewal position that MME sends is visited according to call subscriber terminal for the HSS
Request is put, sends more new position response to visit MME, and visit will be inserted under the call subscriber terminal signing eMSC numbers of carrying
MME。
Preferably, it is described to establish standby carrier module specifically for LTE network after LTE carryings are established, by calling subscribe
Terminal anchors to ATGW, and the visit MME of LTE network utilizes the eMSC numbers of HSS underthrusts, acquisition eMSC addresses, to pass through
The standby carrying of IM-MGW from the ATGW of institute's grappling to master home domain is established by the eMSC of LTE network.
Preferably, the bag established standby carrier module and visit MME transmissions are received also particularly useful for the eMSC of LTE network
The pre-switch request of the parameter containing STN-SR and C-MSISDN, the eMSC of LTE network asks according to the pre-switch, to master home
The IM-MGW in domain sends the request of addition IMS sides IP terminals, and the IM-MGW in the master home domain of LTE network to eMSC by returning
Comprising IP terminal parameter information, it is route STN-SR the and C-MSISDN parameters that eMSC is included in being asked according to pre-switch,
And to call subscriber terminal grappling ATGW send eSRVCC handover request message, and LTE network ATGW according to eSRVCC
Handover request message, establish the standby carrying to the IM-MGW in master home domain.
The scheme provided according to embodiments of the present invention, by the way that the target eMSC of switching to be anchored to the eMSC of home network,
It is unified first to anchor to home network in switching, because anchor point has been fixed, so during call setup, so that it may
So that the carrying of home network to IMS domain to be pre-established, so as in switching, it is only necessary to update home network and visit net to CS
The carrying of network, it thus can further simplify flow during switching, improve switch speed.
Brief description of the drawings
Fig. 1 is a kind of flow chart of improved eSRVCC switching methods provided in an embodiment of the present invention；
Fig. 2 is a kind of schematic diagram of improved eSRVCC switchings realization device provided in an embodiment of the present invention；
Fig. 3 is the flow chart that MME is inserted under home network eMSC addresses provided in an embodiment of the present invention；
Fig. 4 establishes CS home domain to the carrying flow chart of IMS domain when being user LTE callings provided in an embodiment of the present invention；
Fig. 5 is improved eSRVCC switching flows figure provided in an embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing to a preferred embodiment of the present invention will be described in detail, it will be appreciated that described below is excellent
Select embodiment to be merely to illustrate and explain the present invention, be not intended to limit the present invention.
Fig. 1 is a kind of flow chart of improved eSRVCC switching methods provided in an embodiment of the present invention, such as Fig. 1 institutes
Show, including：
Step S101：The SIP that LTE network is initiated according to call subscriber terminal is called, establish for call subscriber terminal with
Called user terminal carries out VoLTE LTE carryings；
Step S102：LTE network is established from ATGW to the standby of the IM-MGW in master home domain after LTE carryings are established
With carrying；
Step S103：During call subscriber terminal and called user terminal carry progress VoLTE via the LTE, if
When needing to carry the VoLTE by circuit domain, the carrying foundation of circuit domain side and renewal are completed using the standby carrying, and pass through
The carrying of circuit domain side continues the VoLTE.
Wherein, include before the SIP callings that the call subscriber terminal is initiated：Call subscriber terminal, which is contracted one, belongs to electricity
The eMSC addresses in road domain, and the eMSC addresses are stored into the HSS to LTE network；The HSS contracts call subscriber terminal
Visit MME is inserted under eMSC numbers.Specifically, the HSS will be inserted into visit under eMSC numbers that call subscriber terminal is contracted
MME includes：The HSS visits the more new position request of MME transmissions according to call subscriber terminal, and renewal position is sent to visit MME
Response is put, and visit MME will be inserted under the call subscriber terminal signing eMSC numbers of carrying.
Wherein, standby carrying of the foundation from ATGW to the IM-MGW in master home domain includes：LTE network is being established
After LTE carryings, call subscriber terminal is anchored into ATGW；The visit MME of LTE network utilizes the eMSC numbers of HSS underthrusts, obtains
EMSC addresses, so that the standby of IM-MGW established via the eMSC of LTE network from the ATGW of institute's grappling to master home domain is held
Carry.Specifically, the eMSC via LTE network establishes the standby of the IM-MGW from the ATGW of institute's grappling to master home domain
Carrying includes：The eMSC of LTE network receives the request of the pre-switch comprising STN-SR and C-MSISDN parameters that visit MME is sent；
The eMSC of LTE network is asked according to the pre-switch, and asking for addition IMS sides IP terminals is sent to the IM-MGW in master home domain
Ask；The IM-MGW in the master home domain of LTE network includes IP terminal parameter information by being returned to eMSC, makes eMSC according to pre-cut
Change in request STN-SR the and C-MSISDN parameters included to be route, and sent to the ATGW of call subscriber terminal grappling
ESRVCC handover request message；The ATGW of LTE network establishes the IM- to master home domain according to eSRVCC handover request message
MGW standby carrying.
Fig. 2 is a kind of schematic diagram of improved eSRVCC switchings realization device provided in an embodiment of the present invention, such as Fig. 2 institutes
Show, including：LTE carrier modules 201 are established, the SIP initiated for LTE network according to call subscriber terminal is called, and is established and is used for
The LTE that call subscriber terminal carries out VoLTE with called user terminal is carried；Standby carrier module 202 is established, for LTE network
After LTE carryings are established, establish from ATGW to the IM-MGW in master home domain standby carrying；Handover module 203, for
Call subscriber terminal is carried during carrying out VoLTE with called user terminal via the LTE, if desired as described in carrying circuit domain
During VoLTE, the carrying foundation of circuit domain side and renewal are completed using the standby carrying, and continue by the carrying of circuit domain side
The VoLTE.
The embodiment of the present invention also includes：Call subscriber terminal, for the eMSC addresses for an ownership circuit domain of contracting, and will
EMSC addresses storage to LTE network HSS, so that the HSS will be inserted under eMSC numbers that call subscriber terminal is contracted
Visit MME.
The embodiment of the present invention also includes underthrust unit, and visiting MME according to call subscriber terminal for the HSS sends more
New position request, more new position response is sent to visit MME, and will be inserted under the call subscriber terminal signing eMSC numbers of carrying
Visit MME.
Wherein, it is described to establish standby carrier module 202 specifically for LTE network after LTE carryings are established, by calling subscribe
Terminal anchors to ATGW, and the visit MME of LTE network utilizes the eMSC numbers of HSS underthrusts, acquisition eMSC addresses, to pass through
The standby carrying of IM-MGW from the ATGW of institute's grappling to master home domain is established by the eMSC of LTE network.
Wherein, it is described to establish what standby carrier module 202 was sent also particularly useful for the eMSC reception visits MME of LTE network
Pre-switch request comprising STN-SR and C-MSISDN parameters, the eMSC of LTE network are asked according to the pre-switch, returned to caller
The IM-MGW for belonging to domain sends the request of addition IMS sides IP terminals, and the IM-MGW in the master home domain of LTE network to eMSC by returning
Return and include IP terminal parameter information, STN-SR the and C-MSISDN parameters that eMSC is included in being asked according to pre-switch is entered walking along the street
By, and to call subscriber terminal grappling ATGW send eSRVCC handover request message, and LTE network ATGW according to
ESRVCC handover request message, establish the standby carrying to the IM-MGW in master home domain.
Fig. 3 is the flow chart that MME is inserted under home network eMSC addresses provided in an embodiment of the present invention, as shown in figure 3, bag
Include：
Step 301：UE roams into LTE network, and Attach requests are initiated to visit MME_1；
Step 302：Visit MME_1 and send ULR (Update Location Request, more new position request) to HSS；
Step 303：HSS sends CLR (Cancel Location Request, canceling position request) to ownership MME_2；
Step 304：(Cancel Location Answer, canceling position should by the CLA that HSS reception ownership MME_2 is returned
Answer)；
Step 305：HSS returns to ULA (Update Location Answer, more new position response) to visit MME_1, together
When carry signing eMSC numbers；
Step 306：Attach flows terminate.
Fig. 4 establishes CS home domain to the carrying flow chart of IMS domain when being user LTE provided in an embodiment of the present invention calling,
As shown in figure 4, including：
Step 401：User terminal UE callers carrying, which is established, to be completed, and anchors to ATGW；
Step 402：MME is according to the eMSC number inquiries DNS (Domain Name System, domain name system) of HSS underthrusts
Configuration, ownership eMSC addresses are obtained, then initiate pre-switch request SRVCC Prepare PS to CS Request to eMSC,
Wherein carry the parameters such as STN-SR, C-MSISDN；
Step 403：EMSC sends ADD REQ message to IM-MGW, the IP terminals of request addition IMS sides；
Step 404：IM-MGW distribute IP resources, return ADD REPLY message arrive eMSC, carry IP terminals IP address with
The information such as port；
Step 405：EMSC is route according to STN-SR, to P-CSCF (Proxy-Call Session Control
Funtion, Proxy Call Session Control Function) and/ATCF_A (Acess Transfer Control Functionality, it is main
The access of user terminal A is made to shift control function) eSRVCC handover request Invite messages are sent, carry local terminal SDP
(Session Description Protocol, Session Description Protocol) information；
Crucial cell is as follows：
Request URI (Uniform Resource Identifier, Uniform Resource Identifier)：STN-SR numbers.Take
Value is derived from the handover request PS to CS Request message that MME is sent to eMSC.
P-Asserted-Identity header fields：C-MSISDN numbers.Value is derived from the handover request that MME is sent to eMSC
PS to CS Request message.
Call_pending parameters:Indicate ATCF calling temporary suspensions at present.
Step 406：P-CSCF/ATCF_A receives Invite message, according to wherein STN-SR numbers, judge the message be by
ESRVCC switchings produce；
P-CSCF/ATCF_A is handled as follows：
P-CSCF/ATCF_A obtains C-MSISDN from INVITE message, with reference to locally preserve+g.3gpp.srvcc mark
Know, eSRVCC relevant informations (ATU-STI (Access Transfer Update-Session Transfer Identifer,
Access transport renewal session transmissions identifier) etc.), determine that UE_A needs the Active state sessions associated.
P-CSCF/ATCF_A carries out media negotiation modification, at the newly-built media endpoints of ATGW, the media end with eMSC sides MGW
Point completes connection.
P-CSCF/ATCF_A returns to 200OK message to eMSC, carries the SDP information of the newly-built end points of local terminal.
Step 407：EMSC sends ACK message to P-CSCF/ATCF_A；
Step 408：Carrying informations of the eMSC in 200 message is handed down to caller IM-MGW by MOD REQ message；
Step 409：IM-MGW sends MOD REPLY message to eMSC, returns to the response of modification destination node attribute command；
Step 410：EMSC returns to pre-switch completion message to MME.
Fig. 5 is improved eSRVCC switching flows figure provided in an embodiment of the present invention, as shown in figure 5, including：
Step 501：Calling UE _ A carryings anchor to ATGW, in talking state；
Step 502：The 3G network signal intensity that UE_A measures adjacent area exceedes thresholding, reporting system measurement report,
ENodeB_A determines switching by judging, sends handover request Handover Required message to MME_A；
Step 503：MME_A initiates eSRVCC handover requests, sends what PS to CS Request message belonged to UE_A
EMSC, the carrying to IMS sides that instruction eMSC has had built up before enabling；
Step 504：EMSC and visited network MSC interactions, complete the carrying of CS sides and establish and update；
Step 505-506：Update the carrying information of IM-MGW CS sides；
Step 507：EMSC initiates ReInvite to ATCF, activates the calling established before；
Step 508-509：P-CSCF/ATCF_A is sent according to the ATU-STI of to be switched session association to SCC AS_A
Invite message, request eSRVCC switchings；
It is true by the former session Call-ID of wherein Target-Dialog header fields after VoLTE AS_A receive Invite message
Fixed to be switched session；
Step 510：Recover media connection between UE_A and UE_B.Network side media information where follow-up UE_A is based on CS nets
Network carries.
That is, first, the eMSC addresses in one ownership CS domain of user's signing.When LTE network is registered, HSS passes through
ULR/ULA flows will be inserted into MME under the address.Then, user establishes when LTE network is initiated to call when the LTE of caller is carried
After the completion of, by the extension message SRVCC Prepare PS to CS Request of Sv interfaces, while establish caller ATGW and arrive
Carrying between the IM-MGW in master home domain after switching in case use.Finally, when switching, it is only necessary to renewal visit net
Network carries to the CS between user attaching domain.After the completion of the bearer update of CS domains, eMSC notice ATCF/ATGW switching carriers, complete
Bearer update.
Wherein, the ULA message definitions after extension are as follows：
Message Format
<User-Data-Answer>::=<Diameter Header:306,PXY,16777217>
<Session-Id>
{Vendor-Specific-Application-Id}
[Result-Code]
[Experimental-Result]
{Auth-Session-State}
{Origin-Host}
{Origin-Realm}
*[Supported-Features]
[Wildcarded-Public-Identity]
[Wildcarded-IMPU]
[User-Data]
[OC-Supported-Features]
[OC-OLR]
[eMSCNumber]
*[AVP]
*[Failed-AVP]
*[Proxy-Info]
*[Route-Record]
Wherein, eMSCNumber AVP are defined as follows:
The eMSCNumber AVP is of type OctetString and shall contain the
Number for eMSC.This AVP contains an number format as described in ITU-T Rec
E.164[41],encoded as a TBCD-string.See 3GPP TS 29.002[24]for encoding of
TBCD-strings.
Wherein, the pre-switch message SRVCC Prepare PS to CS Request of Sv interfaces are defined as follows：
The scheme provided according to embodiments of the present invention, by the way that the target eMSC of switching to be anchored to the eMSC of home network,
It is unified first to anchor to home network in switching, because anchor point has been fixed, so during call setup, so that it may
So that the carrying of home network to IMS domain to be pre-established, so as in switching, it is only necessary to update home network and visit net to CS
The carrying of network, it thus can further simplify flow during switching, improve switch speed.
Although the present invention is described in detail above, the invention is not restricted to this, those skilled in the art of the present technique
Various modifications can be carried out according to the principle of the present invention.Therefore, all modifications made according to the principle of the invention, all should be understood to
Fall into protection scope of the present invention.
Claims (10)
1. a kind of improved eSRVCC switching methods, including：
The SIP that LTE network is initiated according to call subscriber terminal is called, and is established and is entered for call subscriber terminal and called user terminal
Row VoLTE LTE carryings；
LTE network is established from ATGW to the IM-MGW in master home domain standby carrying after LTE carryings are established；
During call subscriber terminal and called user terminal carry progress VoLTE via the LTE, if desired held by circuit domain
When carrying the VoLTE, complete the carrying of circuit domain side using the standby carrying and establish and renewal, and by the carrying of circuit domain side after
It is continuous to carry out the VoLTE；
Wherein, the eSRVCC refers to the single wireless voice calling continuity of enhancing；The SIP refers to session initiation protocol；
The ATGW is to refer to the accession to transfer gateway；The IM-MGW refers to IP multimedia gateways.
2. include before the SIP callings that according to the method for claim 1, the call subscriber terminal is initiated：
The eMSC addresses of one ownership circuit domain of call subscriber terminal signing, and LTE network is arrived into eMSC addresses storage
HSS；
The HSS will be inserted into visit MME under eMSC numbers that call subscriber terminal is contracted；
Wherein, the eMSC refers to strengthen mobile switching centre；The HSS refers to home subscriber server；The MME refers to move
Mobility management entity.
3. according to the method for claim 2, the HSS will be inserted into visit under eMSC numbers that call subscriber terminal is contracted
MME includes：
The HSS visits the more new position request of MME transmissions according to call subscriber terminal, and sending more new position to visit MME should
Answer, and visit MME will be inserted under the call subscriber terminal signing eMSC numbers of carrying.
4. according to the method for claim 3, the foundation is from ATGW to the IM-MGW in master home domain standby carrying bag
Include：
Call subscriber terminal is anchored to ATGW by LTE network after LTE carryings are established；
The visit MME of LTE network utilizes the eMSC numbers of HSS underthrusts, eMSC addresses is obtained, so as to via the eMSC of LTE network
Establish the standby carrying of the IM-MGW from the ATGW of institute's grappling to master home domain.
5. according to the method for claim 4, the eMSC via LTE network is established and returned from the ATGW of institute's grappling to caller
Belonging to the IM-MGW in domain standby carrying includes：
The eMSC of LTE network receives the request of the pre-switch comprising STN-SR and C-MSISDN parameters that visit MME is sent；
The eMSC of LTE network is asked according to the pre-switch, and addition IMS sides IP terminals are sent to the IM-MGW in master home domain
Request；
The IM-MGW in the master home domain of LTE network includes IP terminal parameter information by being returned to eMSC, makes eMSC according to pre-
STN-SR the and C-MSISDN parameters included in handover request are route, and are sent to the ATGW of call subscriber terminal grappling
ESRVCC handover request message；
The ATGW of LTE network establishes the standby carrying to the IM-MGW in master home domain according to eSRVCC handover request message；
Wherein, the STN-SR refers to conversation shift number；The C-MSISDN refers to the mobile station ISDN of association
Number.
6. a kind of improved eSRVCC switchings realization device, including：
LTE carrier modules are established, the SIP initiated for LTE network according to call subscriber terminal is called, and is established for calling subscribe
The LTE that terminal carries out VoLTE with called user terminal is carried；
Standby carrier module is established, for LTE network after LTE carryings are established, establishes the IM- from ATGW to master home domain
MGW standby carrying；
Handover module, for during call subscriber terminal and called user terminal carry via the LTE and to carry out VoLTE, if
When needing to carry the VoLTE by circuit domain, the carrying foundation of circuit domain side and renewal are completed using the standby carrying, and pass through
The carrying of circuit domain side continues the VoLTE.
7. device according to claim 6, in addition to：
Call subscriber terminal, LTE nets are arrived for the eMSC addresses for an ownership circuit domain of contracting, and by eMSC addresses storage
The HSS of network, visit MME is inserted under the eMSC numbers contracted so as to the HSS.
8. device according to claim 7, in addition to underthrust unit, are visited for the HSS according to call subscriber terminal
The more new position request that MME is sent, more new position response is sent to visit MME, and the call subscriber terminal of carrying is contracted
Visit MME is inserted under eMSC numbers.
It is described to establish standby carrier module and held specifically for LTE network establishing LTE 9. device according to claim 8
After load, call subscriber terminal is anchored into ATGW, and the visit MME of LTE network utilizes the eMSC numbers of HSS underthrusts, acquisition
EMSC addresses, so that the standby of IM-MGW established via the eMSC of LTE network from the ATGW of institute's grappling to master home domain is held
Carry.
It is described to establish standby carrier module and connect also particularly useful for the eMSC of LTE network 10. device according to claim 9
The request of the pre-switch comprising STN-SR and C-MSISDN parameters that visit MME is sent is received, the eMSC of LTE network is according to the pre-cut
Request is changed, the request of addition IMS sides IP terminals, the IM- in the master home domain of LTE network are sent to the IM-MGW in master home domain
MGW includes IP terminal parameter information, the STN-SR and C- for eMSC is included in being asked according to pre-switch by being returned to eMSC
MSISDN parameters are route, and send eSRVCC handover request message, and LTE nets to the ATGW of call subscriber terminal grappling
The ATGW of network establishes the standby carrying to the IM-MGW in master home domain according to eSRVCC handover request message.
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