CN102802222A - Method and system for acquiring an enhanced single radio voice call continuity (E-SRVCC) session transfer number for SRVCC (STN-SR) - Google Patents
Method and system for acquiring an enhanced single radio voice call continuity (E-SRVCC) session transfer number for SRVCC (STN-SR) Download PDFInfo
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04W76/10—Connection setup
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Abstract
The invention discloses a method and a system for acquiring an enhanced single radio voice call continuity (E-SRVCC) session transfer number for SRVCC (STN-SR). The method comprises the following steps of: storing a dynamic STN-SR which is allocated to a subscriber into a home subscriber server (HSS) in a visited domain by using access transfer control functionality (ATCF) in the visited domain; and acquiring the dynamic STN-SR from the HSS. By the method and the system, the problem that a switching process cannot be implemented due to incompatibility of equipment in different manufacturers because network element equipment in different domains is purchased from different manufacturers is solved.
Description
Technical field
The present invention relates to communication technique field, be meant acquisition methods and the system of a kind of E-SRVCC STN-SR especially.
Background technology
Internet protocol multimedia subsystem (IMS, IP Multimedia Subsystem) is the developing direction of following multimedia communication, also is the of paramount importance part of next generation network.It is third generation partner program (3GPP; The subsystem of the support IP multimedia service that Third Generation Partnership Project) proposes; Its notable feature is to have adopted session initiation protocol (SIP; Session Initial Protocol) system; Communication is irrelevant with access way, can possess that multiple multimedia service controlled function is separated with bearing capacity, calling separates with session, application separates with service, professional and network detach and multiple abilities such as mobile network and internet service fusion.
Single wireless continuous voice call (SRVCC; Single Radio Voice Call Continuity) realizes that the wireless user is under the environment of single wireless signal (Single Radio); Voice between IMS and circuit switching (CS, circuit switching) switch.UE under the corresponding Single Radio of the SRVCC environment, promptly UE can only use a kind of among the Radio of wireless signal (Radio), LTE of 2G or 3G (2G/3G) at one time.The demand of SRVCC session Handover Number (STN-SR, Session Transfer Number for SRVCC) is that manufacturer terminal proposes, and its objective is the radio frequency and the interlock circuit of multiplexing 2G/3G, LTE network; The STN-SR static configuration in mobile management entity (MME), or by MME from external inquiry.
The ins and outs that SRVCC brings because of Single Radio comprise: the switching between the Radio is very fast, but before switching, need set up by the network side passage that CS is relevant, and far-end is upgraded.
SRVCC switches on the flow scheme design, carries out the passage of CS earlier and creates and far-end renewal (Remote Update), is packet-switching to Circuit-switched switching (PS to CS Handover) afterwards; Wherein, under roaming condition, Remote Update is consuming time to be second level.
Under the high-speed mobile scene, user's the PS fast decay of Radio (like LTE Radio) of being correlated with, maybe be before PS to CS Handover instruction be sent the relevant Radio of PS complete attenuation, then can't accomplish the SRVCC switching.
Generally speaking, the Remote Update of second level also can cause certain Media Clip, causes user experience bad (for example surpass 200ms, the user just can perceive).
For this reason, 3GPP has proposed the notion of E-SRVCC to solve the above-mentioned reduction scheme of switching time: introduce and insert the side media anchor point, reduce the signaling transmission time of Remote Update.Introduce new access side anchor point and insert switching control function (ATCF; Access Transfer Control Functionality) and insert to switch gateway (ATGW; Access Transfer Gateway); As shown in Figure 1, wherein * representes that by disposing what determine ATCF and ATGW with allocation plan be main, and * * representes that the Mw/I2 interface depends on enhanced mobile switching center (E-MSC) ability.Customer call is anchored into ATCF, can reduce and switch distance, reduce switching time.Because ATCF is present in visit ground, STN-SR is made static configuration (PSI of similar home domain SCC_AS) can not be in the SRVCC scheme, as shown in Figure 2 so the E-SRVCC scheme proposes the obtain manner of a kind of new STN-SR, comprising:
Step 1, ATCF (being positioned at the visit territory) receives and for this user who inserts this visit territory distributes dynamic STN-SR, and through user's registration message STN-SR is sent to S-CSCF by user's registration message;
Step 2, S-CSCF returns 401 message to UE, carries the registration challenge information.
Step 3, the user initiates registration message again, carries authentication information.
Step 4 after S-CSCF receives the registration message that the user initiates again, is returned the 200OK response, carries out accreditation verification.
Step 5, after the accreditation verification, S-CSCF carries corresponding dynamic STN-SR to the third-party registration message that the SCC_AS of home domain sends the user;
Step 6, SCC_AS returns the 200OK response to S-CSCF.
Step 7, SCC_AS stores this user's dynamic STN-SR into home subscriber server (HSS, Home Subscriber Server) through Sh interface;
Step 8, HSS should be pushed to MME by dynamic STN-SR.
When the E-SRVCC switching took place, MME used corresponding dynamic STN-SR to trigger MSC and initiates handover call request, and handover call request is sent to the ATCF of former calling of grappling and medium according to dynamic STN-SR.
In this process; Relate to the cooperation in visit ground IMS and two territories of ownership place IMS; Relate to the enhancing of more network element, and need HSS to support the propelling movement of corresponding dynamic STN-SR, and in actual deployment is used; The network element device of same area does not generally adopt the equipment of different manufacturers, and so being easy to generate the incompatible switching that causes of devices from different manufacturers can't realize.
Summary of the invention
In view of this, main purpose of the present invention is to provide acquisition methods and the system of a kind of E-SRVCC STN-SR, to solve the problem that can't realize owing to the incompatible switching that causes of devices from different manufacturers.
For achieving the above object, technical scheme of the present invention is achieved in that
The invention provides the acquisition methods of a kind of E-SRVCC STN-SR, this method comprises:
Access switching control function (ATCF) in the visit territory will store into for the dynamic single wireless continuous voice call session Handover Number (STN-SR) that the user distributes in the home subscriber server (HSS) in the visit territory;
From said HSS, obtain said dynamic STN-SR.
Wherein, this method also comprises: expand the data-interface between said ATCF and the said HSS.
ATCF in the said visit territory will store into for the dynamic STN-SR that the user distributes among the HSS in the visit territory, comprise:
After said ATCF receives the 200OK response of the accreditation verification that home domain returns,, and said dynamic STN-SR stored among the said HSS through the said data-interface of expanding for the user distributes dynamic STN-SR.
From said HSS, obtain said dynamic STN-SR, comprising:
Said MME triggers the said HSS of inquiry, obtains said dynamic STN-SR, and the single wireless continuous voice call (E-SRVCC) of initiating to strengthen switches;
The enhanced mobile switching center (E-MSC) of said MME in the visit territory sent the handoff request message of packet switching (PS) to circuit switching (CS), and carries said dynamic STN-SR;
Said E-MSC uses said dynamic STN-SR to make a call, and call request is routed to the ATCF that distributes said dynamic STN-SR.
From said HSS, obtain said dynamic STN-SR, comprising:
MME initiates E-SRVCC and switches;
The E-MSC of said MME in the visit territory sends the handoff request message of PS to CS, and carries the corresponding static STN-SR of user;
When confirming that the visit territory provides the E-SRVCC function, said E-MSC triggers the said HSS of inquiry according to said static STN-SR, obtains said dynamic STN-SR, and said static STN-SR is revised as said dynamic STN-SR;
Said E-MSC uses said dynamic STN-SR to make a call, and call request is routed to the ATCF that distributes said dynamic STN-SR.
Said E-MSC triggers the said HSS of inquiry according to said static STN-SR, obtains said dynamic STN-SR, and said static STN-SR is revised as said dynamic STN-SR, comprising:
Said E-MSC triggers the STN-SR Service Control Function in the visit territory according to said static STN-SR;
Said STN-SR SCF inquires about said HSS, obtains said dynamic STN-SR, and after said static STN-SR is revised as said dynamic STN-SR, notifies said E-MSC.
The present invention also provides the system that obtains of a kind of E-SRVCC STN-SR, and comprises ATCF, the HSS that is positioned at the visit territory and obtains network element; Wherein,
Said ATCF is used to the user and distributes dynamic STN-SR, and stores among the said HSS;
Said HSS is used to store said dynamic STN-SR;
The said network element that obtains is used for obtaining said dynamic STN-SR from said HSS.
Wherein, this system also comprises managed network element, is used to expand the data-interface between said ATCF and the said HSS.
Said ATCF, also be used to receive the 200OK response of the accreditation verification that home domain returns after, for the user distributes dynamic STN-SR, and said dynamic STN-SR stored among the said HSS through the said data-interface of expanding.
Said switch net element comprises MME and E-MSC;
Said MME is used for triggering the said HSS of inquiry, obtains said dynamic STN-SR, and initiates the E-SRVCC switching;
Said E-MSC is used to receive said MME and obtains the PS that sends behind the said dynamic STN-SR handoff request message to CS, carries said dynamic STN-SR in the said handoff request message; Also be used to use said dynamic STN-SR to make a call.
Said switch net element comprises MME and E-MSC;
Said MME is used to initiate E-SRVCC and switches; Also be used for sending the handoff request message of the PS of the static STN-SR that carries user's correspondence to CS to said E-MSC;
Said E-MSC is used to receive the handoff request message of said PS to CS; Also be used for when confirming that the visit territory provides the E-SRVCC function, triggering the said HSS of inquiry, obtain said dynamic STN-SR, and said static STN-SR is revised as said dynamic STN-SR according to said static STN-SR; Also be used to use said dynamic STN-SR to make a call.
Said switch net element also comprises STN-SR SCF; Be used in the visit territory being triggered the said HSS of inquiry by said E-MSC according to said static STN-SR when the E-SRVCC function is provided, obtain said dynamic STN-SR; And after said static STN-SR is revised as said dynamic STN-SR, notify said E-MSC.
The acquisition methods of E-SRVCC STN-SR of the present invention and system; Through the data-interface between ATCF and the HSS in the visit territory is expanded, the dynamic STN-SR that visit territory ATCF directly will be distributed stores among the HSS in the visit territory, and MME can directly obtain dynamic STN-SR the HSS in the visit territory; So; Obtaining of STN-SR is just irrelevant with home domain HSS, and home domain HSS need not to carry out information and pushes, and has reduced the particularly requirement of HSS of home domain; Network elements such as the ATCF that the method that proposes in the present invention relates to, HSS, MME all are arranged in a territory, therefore, have avoided the not equipment of the network element device employing different manufacturers of same area, the problem that the incompatible switching that causes of the devices from different manufacturers of generation can't realize.
Description of drawings
Fig. 1 is existing E-SRVCC solution sketch map;
Fig. 2 obtains schematic flow sheet for existing E-SRVCC STN-SR;
Fig. 3 obtains scheme one sketch map for E-SRVCC STN-SR of the present invention;
Fig. 4 obtains scheme two sketch mapes for E-SRVCC STN-SR of the present invention;
Fig. 5 is an E-SRVCC STN-SR allocation flow sketch map of the present invention;
Fig. 6 is the E-SRVCC STN-SR acquisition methods schematic flow sheet of the embodiment of the invention one;
Fig. 7 is the E-SRVCC STN-SR acquisition methods schematic flow sheet of the embodiment of the invention two;
Fig. 8 obtains the structural representation of system embodiment one for E-SRVCC STN-SR of the present invention;
Fig. 9 obtains the structural representation of system embodiment two for E-SRVCC STN-SR of the present invention.
Embodiment
The basic thought of the acquisition methods of E-SRVCC STN-SR of the present invention is: the dynamic STN-SR that visit territory ATCF directly will distribute stores among the HSS in the visit territory, from this HSS, obtains dynamic STN-SR, and initiates the E-SRVCC switching.So, obtaining of STN-SR is just irrelevant with home domain HSS, and home domain HSS need not to carry out information and pushes, and has reduced the particularly requirement of HSS of home domain.
The present invention expands the data-interface between ATCF and the HSS in the visit territory, adopts the interface mode of similar Sh; For HSS, this expanded data interface is similar with Sh interface, but consider that the ATCF behavior is not typical A S behavior, therefore, among the present invention with this interface called after Sh ' interface.So just can realize that the dynamic STN-SR that ATCF will distribute stores among the HSS.
ATCF for the user distributes dynamic STN-SR, and stores dynamic STN-SR among the HSS into through the expanded data interface after receiving the 200OK response of the accreditation verification that home domain returns.It is pointed out that when ATCF passes through Sh ' interface dynamic STN-SR is stored in HSS,, but dynamic STN-SR is stored as transparent data, HSS is not resolved requirement through registration message.
Sided access network element obtains dynamic STN-SR from the HSS in visit territory:
A kind of mode is: MME triggers inquiry HSS, obtains dynamic STN-SR, and initiation E-SRVCC switches (this switches according to dynamically STN-SR initiation); Then, MME adopts this dynamic STN-SR to initiate the handoff request of PS to CS, and E-MSC uses this dynamic STN-SR to make a call, and is as shown in Figure 3, because this HSS is positioned at the visit territory, is positioned at a territory with MME, the requirement that does not therefore exist dynamic STN-SR to push.
The another kind of mode of relatively optimizing is: MME initiates E-SRVCC earlier and switches (this switching is initiated according to static STN-SR); Then, MME adopts static STN-SR to initiate the handoff request of PS to CS; Because the visit territory provides E-SRVCC function, E-MSC triggers inquiry HSS according to static STN-SR, obtains dynamic STN-SR; And E-MSC triggers the number of a changing process, and static STN-SR is revised as dynamic STN-SR; E-MSC uses this dynamic STN-SR to make a call then.This kind mode has reduced the requirement to MME.
Trigger STN-SR and the number of the changing process obtained for E-MSC; Concrete: E-MSC triggers service control function (SCF, Service Control Function) (being STN-SR SCF) the inquiry HSS of a special use, obtains dynamic STN-SR; And accomplish the number of changing, as shown in Figure 4.
Through concrete embodiment scheme of the present invention is described below.
Be illustrated in figure 5 as the process that STN-SR distributes, wherein, P-CSCF, ATCF and HSS are positioned at the visit territory, and this flow process comprises:
Step 501, UE inserts through PS, and initiates registration to the IMS in visit territory, and registration message is at first issued P-CSCF;
Step 502, P-CSCF sends to ATCF with registration message;
Step 503, ATCF sends to home domain IMS with registration message;
Step 504, home domain IMS returns 401 message to ATCF, wherein carries the registration challenge information;
Step 505, ATCF transmits 401 message to P-CSCF;
Step 506, P-CSCF transmits 401 message to UE;
Step 507, UE initiates registration message again, carries authentication information;
Step 508, P-CSCF transmits registration message to ATCF;
Step 509, ATCF transmits registration message to home domain IMS;
Step 510, home domain IMS confirms registration, returns 200OK and responds ATCF;
Step 511, ATCF for this UE distributes dynamic STN-SR, and passes through Sh ' interface and stores HSS into after receiving the 200OK response of accreditation verification;
Step 512, ATCF transmits 200OK and responds P-CSCF;
Step 513, P-CSCF transmits 200OK and responds UE, and registration is accomplished.
In conjunction with Fig. 3, the flow chart of E-SRVCC handoff procedure embodiment one of the present invention is as shown in Figure 6, and wherein, MME, E-MSC, ATCF and HSS all are positioned at the visit territory, and this flow process comprises:
Step 601, before E-SRVCC switched, MME triggered inquiry HSS, therefrom obtains the dynamic STN-SR that ATCF distributes for this UE, and switched according to this dynamic STN-SR initiation E-SRVCC;
Step 602, get access to dynamic STN-SR after, MME initiates the handoff request (PS to CS Req) of PS to CS to E-MSC, carries the dynamic STN-SR of UE in this request message;
Step 603, E-MSC uses this dynamic STN-SR to make a call, and call request is routed to the ATCF that distributes this dynamic STN-SR.
In order to further consider the requirement that reduces MME; The present invention proposes the prioritization scheme that a kind of MME obtains dynamic STN-SR; In the process of initiating the E-SRVCC switching; MME does not distinguish the SRVCC switching or E-SRVCC switches, the unified static STN-SR that in PS to CS Req message, carries UE by original SRVCC handoff procedure.For the STN-SR that distinguishes static allocation and the STN-SR of dynamic assignment, among the present invention, represent static STN-SR with SCC_AS STN-SR, represent dynamic STN-SR with ATCF STN-SR.
The E-SRVCC switching flow of this optimization is as shown in Figure 7, comprising:
At first MME initiates the E-SRVCC switching according to static STN-SR, carries out following flow process then:
Step 701, MME sends PS to CS Req message to E-MSC, carries SCC_AS STN-SR;
Step 702, when the visit territory provided the E-SRVCC function, E-MSC triggered STN-SR SCF according to SCC_AS STN-SR;
Step 703, STN-SR SCF inquires about HSS, obtains ATCF STN-SR;
Step 704, STN-SR SCF carries out the number of changing, and SCC_AS STN-SR is revised as ATCFSTN-SR, and notice E-MSC;
Step 705, E-MSC uses ATCF STN-SR to make a call, and call request is routed to the ATCF that distributes this ATCF STN-SR.
In order to realize above-mentioned acquisition methods, the present invention also provides the system that obtains of a kind of STN-SR, and like Fig. 8 and shown in Figure 9, comprises ATCF, the HSS that is positioned at the visit territory and obtains network element; Wherein,
ATCF is used to the user and distributes dynamic STN-SR, and stores among the HSS;
HSS is used to store dynamic STN-SR;
Obtain network element, be used for obtaining dynamic STN-SR, and initiate the E-SRVCC switching from HSS.
This system can also comprise a managed network element, is used for the data-interface between expansion AT CF and the HSS, and this network element is optional.
Wherein, receive the 200OK response of the accreditation verification that home domain returns after, ATCF is dynamic STN-SR for the user distributes, and dynamic STN-SR is stored among the HSS through the expanded data interface.
From HSS, obtain dynamic STN-SR, and initiation E-SRVCC switching way there are following two kinds:
One, switch net element comprises MME and E-MSC, and is as shown in Figure 8.
Before E-SRVCC switched, MME was used for triggering inquiry HSS, obtains dynamic STN-SR, and initiated the E-SRVCC switching;
E-MSC is used to receive MME and obtains the PS that sends behind the dynamic STN-SR handoff request message to CS, carries dynamic STN-SR in this handoff request message; E-MSC also is used for using this dynamic STN-SR to make a call.
Two, switch net element comprises MME and E-MSC, and is as shown in Figure 9.
MME is used to initiate E-SRVCC and switches; Also be used for sending the handoff request message of the PS of the static STN-SR that carries user's correspondence to CS to E-MSC;
E-MSC is used to receive the handoff request message of the PS that carries the corresponding static STN-SR of user of MME transmission to CS; And when confirming that the visit territory provides the E-SRVCC function, trigger inquiry HSS according to static STN-SR, obtain dynamic STN-SR, and static STN-SR is revised as dynamic STN-SR; Also be used to use dynamic STN-SR to make a call.
Further, as shown in Figure 9, switch net element also comprises STN-SR SCF; Be used in the visit territory being triggered inquiry HSS by E-MSC according to static STN-SR when the E-SRVCC function is provided, obtain dynamic STN-SR; And after static STN-SR is revised as dynamic STN-SR, notice E-MSC.
The above is merely preferred embodiment of the present invention, is not to be used to limit protection scope of the present invention.
Claims (12)
1. the acquisition methods of an E-SRVCC STN-SR is characterized in that, this method comprises:
Access switching control function (ATCF) in the visit territory will store into for the dynamic single wireless continuous voice call session Handover Number (STN-SR) that the user distributes in the home subscriber server (HSS) in the visit territory;
From said HSS, obtain said dynamic STN-SR.
2. according to the acquisition methods of the said E-SRVCC STN-SR of claim 1, it is characterized in that this method also comprises: expand the data-interface between said ATCF and the said HSS.
3. according to the acquisition methods of the said E-SRVCC STN-SR of claim 2, it is characterized in that the ATCF in the said visit territory will store into for the dynamic STN-SR that the user distributes among the HSS in the visit territory, comprise:
After said ATCF receives the 200OK response of the accreditation verification that home domain returns,, and said dynamic STN-SR stored among the said HSS through the said data-interface of expanding for the user distributes dynamic STN-SR.
4. according to the acquisition methods of claim 1 or 3 said E-SRVCC STN-SR, it is characterized in that, from said HSS, obtain said dynamic STN-SR, comprising:
Said MME triggers the said HSS of inquiry, obtains said dynamic STN-SR, and the single wireless continuous voice call (E-SRVCC) of initiating to strengthen switches;
The enhanced mobile switching center (E-MSC) of said MME in the visit territory sent the handoff request message of packet switching (PS) to circuit switching (CS), and carries said dynamic STN-SR;
Said E-MSC uses said dynamic STN-SR to make a call, and call request is routed to the ATCF that distributes said dynamic STN-SR.
5. according to the acquisition methods of claim 1 or 3 said E-SRVCC STN-SR, it is characterized in that, from said HSS, obtain said dynamic STN-SR, comprising:
MME initiates E-SRVCC and switches;
The E-MSC of said MME in the visit territory sends the handoff request message of PS to CS, and carries the corresponding static STN-SR of user;
When confirming that the visit territory provides the E-SRVCC function, said E-MSC triggers the said HSS of inquiry according to said static STN-SR, obtains said dynamic STN-SR, and said static STN-SR is revised as said dynamic STN-SR;
Said E-MSC uses said dynamic STN-SR to make a call, and call request is routed to the ATCF that distributes said dynamic STN-SR.
6. according to the acquisition methods of the said E-SRVCC STN-SR of claim 5; It is characterized in that said E-MSC triggers the said HSS of inquiry according to said static STN-SR, obtains said dynamic STN-SR; And said static STN-SR is revised as said dynamic STN-SR, comprising:
Said E-MSC triggers the STN-SR Service Control Function in the visit territory according to said static STN-SR;
Said STN-SR SCF inquires about said HSS, obtains said dynamic STN-SR, and after said static STN-SR is revised as said dynamic STN-SR, notifies said E-MSC.
7. the system that obtains of an E-SRVCC STN-SR is characterized in that, comprises ATCF, the HSS that is positioned at the visit territory and obtains network element; Wherein,
Said ATCF is used to the user and distributes dynamic STN-SR, and stores among the said HSS;
Said HSS is used to store said dynamic STN-SR;
The said network element that obtains is used for obtaining said dynamic STN-SR from said HSS.
8. according to the system that obtains of the said E-SRVCC STN-SR of claim 7, it is characterized in that this system also comprises managed network element, be used to expand the data-interface between said ATCF and the said HSS.
9. the system that obtains of said according to Claim 8 E-SRVCC STN-SR; It is characterized in that; Said ATCF; After also being used to receive the 200OK response of the accreditation verification that home domain returns,, and said dynamic STN-SR stored among the said HSS through the said data-interface of expanding for the user distributes dynamic STN-SR.
10. according to the system that obtains of claim 7 or 9 said E-SRVCC STN-SR, it is characterized in that said switch net element comprises MME and E-MSC;
Said MME is used for triggering the said HSS of inquiry, obtains said dynamic STN-SR, and initiates the E-SRVCC switching;
Said E-MSC is used to receive said MME and obtains the PS that sends behind the said dynamic STN-SR handoff request message to CS, carries said dynamic STN-SR in the said handoff request message; Also be used to use said dynamic STN-SR to make a call.
11. the system that obtains according to claim 7 or 9 said E-SRVCC STN-SR is characterized in that said switch net element comprises MME and E-MSC;
Said MME is used to initiate E-SRVCC and switches; Also be used for sending the handoff request message of the PS of the static STN-SR that carries user's correspondence to CS to said E-MSC;
Said E-MSC is used to receive the handoff request message of said PS to CS; Also be used for when confirming that the visit territory provides the E-SRVCC function, triggering the said HSS of inquiry, obtain said dynamic STN-SR, and said static STN-SR is revised as said dynamic STN-SR according to said static STN-SR; Also be used to use said dynamic STN-SR to make a call.
12. the system that obtains according to the said E-SRVCC STN-SR of claim 11; It is characterized in that said switch net element also comprises STN-SR SCF, be used in the visit territory when E-SRVCC function is provided; Triggered the said HSS of inquiry by said E-MSC according to said static STN-SR; Obtain said dynamic STN-SR, and after said static STN-SR is revised as said dynamic STN-SR, notify said E-MSC.
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| CN201110142022.8A CN102802222B (en) | 2011-05-26 | 2011-05-26 | The acquisition methods and system of a kind of E SRVCC STN SR |
| PCT/CN2012/074440 WO2012159518A1 (en) | 2011-05-26 | 2012-04-20 | Method and system for acquiring e-srvcc stn-sr |
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| CN201110142022.8A CN102802222B (en) | 2011-05-26 | 2011-05-26 | The acquisition methods and system of a kind of E SRVCC STN SR |
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| CN104205886A (en) * | 2013-12-03 | 2014-12-10 | 华为技术有限公司 | Method and apparatus for maintaining call continuity |
| CN105052201A (en) * | 2013-03-14 | 2015-11-11 | T移动美国公司 | Communication handovers from networks using unlicensed spectrum to circuit-switched networks |
| CN107517453A (en) * | 2012-12-31 | 2017-12-26 | 中兴通讯股份有限公司 | Identification information, the sending method of call handover request and device |
| CN109996298A (en) * | 2017-12-31 | 2019-07-09 | 中国移动通信集团重庆有限公司 | Inter-network switching method, device, equipment and medium |
| CN110225558A (en) * | 2018-03-02 | 2019-09-10 | 中国移动通信集团设计院有限公司 | Trans-regional call handling method, MME, HSS and eMSC |
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| CN101227677A (en) * | 2008-02-05 | 2008-07-23 | 中兴通讯股份有限公司 | Single wireless channel voice business continuity field switching method |
| CN101227647A (en) * | 2008-02-05 | 2008-07-23 | 中兴通讯股份有限公司 | Switching method of keeping multimedia conversation continuity business |
| CN101662756A (en) * | 2008-08-28 | 2010-03-03 | 华为技术有限公司 | Voice continuous call switching method and system and mobile service switching center |
| EP2288205A1 (en) * | 2009-08-17 | 2011-02-23 | Alcatel Lucent | Method and apparatus for roaming between HPLMN with CSoPS IWF interworking function and VPLMN supporting SRVCC |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107517453A (en) * | 2012-12-31 | 2017-12-26 | 中兴通讯股份有限公司 | Identification information, the sending method of call handover request and device |
| CN105052201A (en) * | 2013-03-14 | 2015-11-11 | T移动美国公司 | Communication handovers from networks using unlicensed spectrum to circuit-switched networks |
| CN105052201B (en) * | 2013-03-14 | 2020-03-27 | T移动美国公司 | Handover of communications from a network using unlicensed spectrum to a circuit-switched network |
| CN103561432A (en) * | 2013-10-28 | 2014-02-05 | 华为技术有限公司 | Single radio voice call continuity transfer method, equipment and system |
| WO2015062468A1 (en) * | 2013-10-28 | 2015-05-07 | 华为技术有限公司 | Method, device and system for single radio voice call continuity handover |
| CN103561432B (en) * | 2013-10-28 | 2017-04-12 | 华为技术有限公司 | Single radio voice call continuity transfer method, equipment and system |
| CN104205886A (en) * | 2013-12-03 | 2014-12-10 | 华为技术有限公司 | Method and apparatus for maintaining call continuity |
| WO2015081477A1 (en) * | 2013-12-03 | 2015-06-11 | 华为技术有限公司 | Method and device for keeping call continuity |
| CN109996298A (en) * | 2017-12-31 | 2019-07-09 | 中国移动通信集团重庆有限公司 | Inter-network switching method, device, equipment and medium |
| CN109996298B (en) * | 2017-12-31 | 2021-11-09 | 中国移动通信集团重庆有限公司 | Cross-network switching method, device, equipment and medium |
| CN110225558A (en) * | 2018-03-02 | 2019-09-10 | 中国移动通信集团设计院有限公司 | Trans-regional call handling method, MME, HSS and eMSC |
| CN110225558B (en) * | 2018-03-02 | 2021-07-09 | 中国移动通信集团设计院有限公司 | Cross-region call processing method, MME, HSS and eMSC |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2012159518A1 (en) | 2012-11-29 |
| CN102802222B (en) | 2017-06-06 |
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