CN107635217B - Improved eSRVCC switching implementation method and device - Google Patents
Improved eSRVCC switching implementation method and device Download PDFInfo
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- CN107635217B CN107635217B CN201610569797.6A CN201610569797A CN107635217B CN 107635217 B CN107635217 B CN 107635217B CN 201610569797 A CN201610569797 A CN 201610569797A CN 107635217 B CN107635217 B CN 107635217B
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Abstract
The invention discloses an improved eSRVCC switching implementation method and device, relating to the technical field of mobile communication, wherein the method comprises the following steps: the LTE network establishes an LTE bearer for VoLTE between the calling user terminal and the called user terminal according to the SIP call initiated by the calling user terminal; after the LTE network establishes the LTE bearer, the standby bearer from the ATGW to the IM-MGW of the calling home domain is established; and during the VoLTE is carried out by the calling user terminal and the called user terminal through the LTE bearer, if the VoLTE needs to be carried by the circuit domain, the backup bearer is utilized to complete the establishment and the updating of the bearer at the circuit domain side, and the VoLTE is continuously carried out through the bearer at the circuit domain side. The invention effectively improves the switching time delay and improves the user experience.
Description
Technical Field
The invention belongs to the technical field of mobile communication, and particularly relates to an improved eSRVCC (enhanced Single Radio Voice Call Continuity) switching implementation method and device.
Background
At present, LTE (Long Term Evolution) network development enters a voice and Multimedia introduction phase, LTE wireless coverage is gradually improved, and IMS (IP Multimedia system) network deployment begins. At this stage, not only broadband services can be enjoyed by the LTE terminal, but also rich IMS multimedia services can be enjoyed by making a call through the LTE network (i.e., volte (voice Over LTE) voice services).
However, as the LTE network coverage is still not perfect, the traditional voice services provided by CS are still needed to be used for supplement beyond the LTE wireless coverage. At this time, the SRVCC (Single Radio Voice Call Continuity)/eSRVCC scheme can solve the problem of Voice control and Voice Continuity when the terminal is switched to a CS (Circuit Switching) network, and when the terminal is in an LTE network, the terminal uses a VoLTE Voice service, and when the terminal roams to a region without an LTE signal, the terminal is switched to a conventional CS network to provide a Voice service.
The terminal can only reside in the LTE or 2G/3G network at the same time; in an LTE coverage area, LTE is used as an access channel, voice service is controlled by an IMS, and data service is dredged by the LTE; when no LTE coverage exists, a Switching message is transmitted through an Sv interface between an MSC Server (Mobile Switching Center Server) and an MME (Mobility Management Entity), an SRVCC/eSRVCC flow is executed, and the SRVCC/eSRVCC flow is dropped to a 2G/3G network to keep service continuity.
SRVCC mainly solves the problem of how to keep the continuity of Voice service when a single radio frequency UE moves between an LTE/Pre-LTE network and a 2G/3G network, namely, the single radio frequency UE seamlessly switches between VoIP (Voice over Internet Protocol) Voice and CS Voice controlled by IMS.
Description of handover procedure of SRVCC:
an eNodeB (evolved NodeB) decides to initiate a switching process according to a wireless signal measurement report sent by UE;
2, the MME initiates a Switching request from PS (Packet Switching) to CS to eMSC (enhanced MSC);
eMSC initiates a switching preparation message to the target MSC;
4. switching request and response between the target MSC and the wireless side;
5, establishing a bearer between the eMSC and the target MSC;
eMSC initiates a Session establishment request to IMS domain, called Number is STN-SR (Session Transfer Number Single-Radio), calling Number is MSISDN (Mobile Station Integrated Services Digital Network Number), Session is routed to SCC AS (Service Central and Continuity Application Server);
7-1, SCC AS initiates the Media address update of the remote UE of the session, and the remote UE switches the Media address of the opposite end to MGW (Media Gateway);
7-2.SCC AS releases IMS session branch;
eMSC sends PS- > CS handover response, eNodeB sends handover command;
9. the terminal is accessed to UTRAN (Universal Terrestrial Radio Access Network)/GERAN (GSM EDGE Radio Access Network, GSM/EDGE Radio Access Network), and establishes a bearer with a target MSCS (Management Scheduling and Control System).
However, the switching delay of SRVCC is long, reaching 200-. The time for a conventional 2G/3G handover is about 90-200 ms.
To solve these problems of SRVCC technology, eSRVCC technology is introduced in 3GPP R10.
eSRVCC is added to SRVCC scheme, by adding logic function of ATCF (Access Transfer Control function) (Control plane) and logic function of ATGW (Access Transfer Gateway) (media plane) in visit area, media stream is anchored in Virtual Public Land Mobile Network (VPLMN), thus when SRVCC switching occurs, the media path rebuilding process from LTE to CS switching can be completed in VPLMN, and switching time delay can be effectively reduced.
In the eSRVCC handover scheme, the eMSC of the visited network is used as a handover target, and the eMSC of the visited network initiates a call to an ATCF (access Transfer Control function) during handover. The bearer between the ATGW and the IM-MGW (IP Multimedia Gateway) is updated only when handover occurs, so the handover time is still longer for a UE moving at high speed.
Disclosure of Invention
The technical problem solved by the scheme provided by the embodiment of the invention is that the existing eEVCC switching is to initiate a call to an ATCF when an eMSC of a visited network is switched, and the bearer between an ATGW and an IM-MGW is updated when the switching occurs, so that the time delay is longer.
The improved eSRVCC switching implementation method provided by the embodiment of the invention comprises the following steps:
the LTE network establishes an LTE bearer for VoLTE between the calling user terminal and the called user terminal according to an SIP (Session Initiation Protocol) call initiated by the calling user terminal;
after the LTE network establishes the LTE bearer, the standby bearer from the ATGW to the IM-MGW of the calling home domain is established;
and during the VoLTE is carried out by the calling user terminal and the called user terminal through the LTE bearer, if the VoLTE needs to be carried by the circuit domain, the backup bearer is utilized to complete the establishment and the updating of the bearer at the circuit domain side, and the VoLTE is continuously carried out through the bearer at the circuit domain side.
Preferably, the SIP call initiated by the calling user terminal previously includes:
a calling Subscriber terminal signs an eMSC address of a Home circuit domain, and stores the eMSC address into an HSS (Home Subscriber Server) of an LTE network;
and the HSS inserts the eMSC number signed by the calling user terminal to the visiting MME.
Preferably, the HSS inserting the eMSC number subscribed by the calling subscriber terminal to the visited MME includes:
and the HSS sends an update position response to the visiting MME according to the update position request sent by the visiting MME of the calling user terminal, and inserts the carried signing eMSC number of the calling user terminal into the visiting MME.
Preferably, the establishing of the backup bearer from the ATGW to the IM-MGW of the calling home domain includes:
after the LTE network establishes the LTE bearer, anchoring the calling user terminal to the ATGW;
the visiting MME of the LTE network acquires an eMSC address by utilizing the eMSC number inserted by the HSS so as to establish a standby bearer from the anchored ATGW to the IM-MGW of the calling home domain through the eMSC of the LTE network.
Preferably, the establishing, via the eMSC of the LTE network, the backup bearer from the anchored ATGW to the IM-MGW of the calling home domain includes:
an eMSC of an LTE network receives a pre-switching request which is sent by a visiting MME and contains STN-SR (Session Transfer Number Single-Radio) and C-MSISDN (registration-MSISDN) parameters;
the eMSC of the LTE network sends a request for adding an IP terminal at an IMS side to the IM-MGW of the calling home domain according to the pre-switching request;
an IM-MGW of a calling home domain of the LTE network returns information containing IP terminal parameters to the eMSC, so that the eMSC routes according to STN-SR and C-MSISDN parameters contained in the pre-switching request and sends an eSRVCC switching request message to an ATGW anchored by a calling user terminal;
and the ATGW of the LTE network establishes a standby bearer to the IM-MGW of the calling home domain according to the eSRVCC switching request message.
The improved eSRVCC switching implementation device provided by the embodiment of the present invention includes:
the method comprises the steps that an LTE bearing module is established, and the LTE bearing module is used for establishing LTE bearing for VoLTE between a calling user terminal and a called user terminal according to an SIP call initiated by the calling user terminal by an LTE network;
a standby bearer establishing module, which is used for establishing a standby bearer from the ATGW to the IM-MGW of the calling home domain after the LTE bearer is established by the LTE network;
and the switching module is used for completing establishment and updating of the circuit domain side bearer by using the standby bearer and continuing VoLTE through the circuit domain side bearer if the VoLTE needs to be carried by the circuit domain during the VoLTE is carried by the calling user terminal and the called user terminal through the LTE bearer.
Preferably, the method further comprises the following steps:
the calling user terminal is used for signing an eMSC address of a home circuit domain and storing the eMSC address into an HSS of an LTE network so that the HSS can insert the signed eMSC number into a visiting MME.
Preferably, the system further comprises a drop-in unit, configured to send a location update response to the visited MME according to a location update request sent by the calling user terminal visiting the MME, and drop the carried signed eMSC number of the calling user terminal to the visited MME.
Preferably, the establishing of the standby bearer module is specifically configured to anchor the calling user terminal to the ATGW in the LTE network after the LTE bearer is established in the LTE network, and the visited MME of the LTE network acquires an eMSC address by using an eMSC number inserted in the HSS, so as to establish a standby bearer from the anchored ATGW to the IM-MGW of the calling home domain via the eMSC of the LTE network.
Preferably, the backup bearer establishing module is further specifically configured to enable the eMSC to receive a pre-handover request containing STN-SR and C-MSISDN parameters sent by the visited MME, the eMSC of the LTE network sends a request for adding an IMs side IP terminal to the IM-MGW of the calling home domain according to the pre-handover request, the IM-MGW of the calling home domain of the LTE network returns information containing IP terminal parameters to the eMSC, so that the eMSC routes according to the STN-SR and C-MSISDN parameters contained in the pre-handover request, and sends an eSRVCC handover request message to the ATGW anchored by the calling user terminal, and the ATGW of the LTE network establishes a backup bearer to the IM-MGW of the calling home domain according to the eSRVCC handover request message.
According to the scheme provided by the embodiment of the invention, the switched target eMSC is anchored to the eMSC of the home network, and is uniformly anchored to the home network in advance during switching, and because the anchor point is fixed, the bearer from the home network to the IMS domain can be pre-established in the call establishment process, so that the bearer from the home network to the CS visiting network only needs to be updated during switching, the flow during switching can be further simplified, and the switching speed is improved.
Drawings
Fig. 1 is a flowchart of an improved eSRVCC handover implementation method according to an embodiment of the present invention;
fig. 2 is a schematic diagram of an improved eSRVCC switching implementation apparatus provided by an embodiment of the present invention;
fig. 3 is a flowchart of home network eMSC address add-drop to MME according to an embodiment of the present invention;
fig. 4 is a bearer flow diagram for establishing a CS home domain to an IMS domain during an LTE call of a user according to an embodiment of the present invention;
fig. 5 is a flow chart of the improved eSRVCC handover provided by the embodiment of the present invention.
Detailed Description
The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, and it should be understood that the preferred embodiments described below are only for the purpose of illustrating and explaining the present invention, and are not to be construed as limiting the present invention.
Fig. 1 is a flowchart of an improved eSRVCC handover implementation method according to an embodiment of the present invention, as shown in fig. 1, including:
step S101: the LTE network establishes an LTE bearer for VoLTE between the calling user terminal and the called user terminal according to the SIP call initiated by the calling user terminal;
step S102: after the LTE network establishes the LTE bearer, the standby bearer from the ATGW to the IM-MGW of the calling home domain is established;
step S103: and during the VoLTE is carried out by the calling user terminal and the called user terminal through the LTE bearer, if the VoLTE needs to be carried by the circuit domain, the backup bearer is utilized to complete the establishment and the updating of the bearer at the circuit domain side, and the VoLTE is continuously carried out through the bearer at the circuit domain side.
Wherein, the SIP call initiated by the calling user terminal includes: a calling user terminal signs an eMSC address of a home circuit domain and stores the eMSC address to HSS of an LTE network; and the HSS inserts the eMSC number signed by the calling user terminal to the visiting MME. Specifically, the HSS inserting the eMSC number subscribed by the calling subscriber terminal to the visited MME includes: and the HSS sends an update position response to the visiting MME according to the update position request sent by the visiting MME of the calling user terminal, and inserts the carried signing eMSC number of the calling user terminal into the visiting MME.
Wherein, the establishing of the standby bearer from the ATGW to the IM-MGW of the calling home domain comprises: after the LTE network establishes the LTE bearer, anchoring the calling user terminal to the ATGW; the visiting MME of the LTE network acquires an eMSC address by utilizing the eMSC number inserted by the HSS so as to establish a standby bearer from the anchored ATGW to the IM-MGW of the calling home domain through the eMSC of the LTE network. Specifically, the establishing, via the eMSC of the LTE network, a backup bearer from the anchored ATGW to the IM-MGW of the calling home domain includes: an eMSC of the LTE network receives a pre-switching request containing STN-SR and C-MSISDN parameters sent by a visiting MME; the eMSC of the LTE network sends a request for adding an IP terminal at an IMS side to the IM-MGW of the calling home domain according to the pre-switching request; an IM-MGW of a calling home domain of the LTE network returns information containing IP terminal parameters to the eMSC, so that the eMSC routes according to STN-SR and C-MSISDN parameters contained in the pre-switching request and sends an eSRVCC switching request message to an ATGW anchored by a calling user terminal; and the ATGW of the LTE network establishes a standby bearer to the IM-MGW of the calling home domain according to the eSRVCC switching request message.
Fig. 2 is a schematic diagram of an improved eSRVCC handover implementation apparatus according to an embodiment of the present invention, as shown in fig. 2, including: an LTE bearer establishing module 201, configured to establish, by an LTE network, an LTE bearer for performing VoLTE between a calling user terminal and a called user terminal according to an SIP call initiated by the calling user terminal; a backup bearer establishing module 202, configured to establish a backup bearer from the ATGW to the IM-MGW of the calling home domain after the LTE bearer is established by the LTE network; the switching module 203 is configured to, during a period that the calling user equipment and the called user equipment perform VoLTE via the LTE bearer, complete establishment and update of a bearer on a circuit domain side by using the backup bearer if the VoLTE needs to be carried by the circuit domain, and continue performing the VoLTE via the bearer on the circuit domain side.
The embodiment of the invention also comprises the following steps: the calling user terminal is used for signing an eMSC address of a home circuit domain and storing the eMSC address into an HSS of an LTE network, so that the HSS can insert the eMSC number signed by the calling user terminal into a visiting MME.
The embodiment of the invention also comprises a down-plug unit which is used for the HSS to send a position updating response to the visiting MME according to the position updating request sent by the visiting MME of the calling user terminal and to down-plug the carried signing eMSC number of the calling user terminal to the visiting MME.
The establishing backup bearer module 202 is specifically configured to anchor the calling user terminal to the ATGW after the LTE network establishes the LTE bearer, and the visited MME of the LTE network acquires an eMSC address by using an eMSC number inserted in the HSS, so as to establish a backup bearer from the anchored ATGW to the IM-MGW of the calling home domain via the eMSC of the LTE network.
The establishing backup bearer module 202 is further specifically configured to enable the eMSC to receive a pre-switching request containing STN-SR and C-MSISDN parameters sent by a visited MME, the eMSC of the LTE network sends a request for adding an IMs side IP terminal to the IM-MGW of the calling home domain according to the pre-switching request, the IM-MGW of the calling home domain of the LTE network returns information containing IP terminal parameters to the eMSC, so that the eMSC routes according to the STN-SR and C-MSISDN parameters contained in the pre-switching request, and sends an eSRVCC switching request message to the ATGW anchored by the calling user terminal, and the ATGW of the LTE network establishes a backup bearer to the IM-MGW of the calling home domain according to the eSRVCC switching request message.
Fig. 3 is a flowchart of home network eMSC address dropping to MME according to an embodiment of the present invention, and as shown in fig. 3, includes:
step 301: the UE roams to an LTE network and initiates an Attach request to a visiting MME _ 1;
step 302: visiting MME _1 sends ULR (Update Location Request) to HSS;
step 303: the HSS sends a CLR (Cancel Location Request) to the home MME _ 2;
step 304: the HSS receives CLA (Cancel Location Answer) returned by the home MME _ 2;
step 305: HSS returns ULA (Update Location Answer) to visit MME _1, and carries contracted eMSC number at the same time;
step 306: the Attach flow ends.
Fig. 4 is a bearer flow diagram for establishing a CS home domain to an IMS domain during an LTE call of a user according to an embodiment of the present invention, as shown in fig. 4, including:
step 401: user terminal UE calling load building is completed and anchored to ATGW;
step 402: the MME queries DNS (Domain Name System ) configuration according to the eMSC number inserted by the HSS, acquires an attributive eMSC address, and then initiates a pre-switching Request SRVCC Prepare PS to CS Request to the eMSC, wherein the pre-switching Request SRVCC Preprepare PS to CS Request carries parameters such as STN-SR, C-MSISDN and the like;
step 403: the eMSC sends an ADD REQ message to the IM-MGW to request to ADD an IP terminal at the IMS side;
step 404: IM-MGW allocates IP resources, returns ADD REPLY message to eMSC, and carries information such as IP address and port of IP terminal;
step 405: eMSC routes according to STN-SR, and sends eSRVCC switching request Invite message to P-CSCF (Proxy-Call Session Control function)/ATCF _ A (Access Transfer Control function of calling user terminal A), carrying local SDP (Session Description Protocol) information;
the key cells are as follows:
request URI (Uniform Resource Identifier): STN-SR number. The value is derived from a handover Request PS to CS Request message sent by the MME to the eMSC.
P-Asserted-Identity header field: C-MSISDN number. The value is derived from a handover Request PS to CS Request message sent by the MME to the eMSC.
A Call pending parameter indicating that the ATCF is currently on hold for the Call.
Step 406: the P-CSCF/ATCF _ A receives the Invite message, and judges that the message is generated by eSRVCC switching according to the STN-SR number in the Invite message;
the P-CSCF/ATCF _ A is processed as follows:
and the P-CSCF/ATCF _ A acquires the C-MSISDN from the INVITE message, and determines the Active state Session which the UE _ A needs to be associated with by combining the locally stored + g.3gpp.srvcc identifier, eSRVCC related information (ATU-STI (Access Transfer Update-Session Transfer identifier) and the like).
And the P-CSCF/ATCF _ A carries out media negotiation modification, creates a media endpoint at the ATGW and completes connection with the media endpoint of the MGW at the eMSC side.
And the P-CSCF/ATCF _ A returns a 200OK message to the eMSC, and carries SDP information of the newly-built endpoint of the home terminal.
Step 407: the eMSC sends an ACK message to the P-CSCF/ATCF _ A;
step 408: the eMSC transmits the bearer information in the 200 message to the calling IM-MGW through the MOD REQ message;
step 409: IM-MGW sends MOD REPLY message to eMSC, and returns the response of modifying the terminal node attribute command;
step 410: the eMSC returns a pre-handover complete message to the MME.
Fig. 5 is a flow chart of the improved eSRVCC handover provided by the embodiment of the present invention, as shown in fig. 5, including:
step 501: the calling UE _ A is anchored to the ATGW and is in a call state;
step 502: UE _ A measures that the 3G network signal intensity of the adjacent cell exceeds the threshold, reports a system measurement report, eNodeB _ A decides switching through judgment, and sends a switching request Handover Required message to MME _ A;
step 503: MME _ A initiates an eSRVCC switching Request, sends a PS to CS Request message to an eMSC attributed to UE _ A, and indicates the eMSC to enable a previously established bearer to an IMS side;
step 504: eMSC interacts with visited network MSC to complete the establishment and update of CS side load;
step 505-506: updating the bearing information of the CS side of the IM-MGW;
step 507: the eMSC initiates a Reinvite to an ATCF, and activates the call established before;
step 508-509: the P-CSCF/ATCF _ A sends an Invite message to the SCC AS _ A according to the ATU-STI associated with the session to be switched, and requests eSRVCC switching;
after receiving the Invite message, VoLTE AS _ A determines a session to be switched through an original session Call-ID of a Target-Dialog header field;
step 510: and restoring the media connection between the UE _ A and the UE _ B. And the media information of the network side where the subsequent UE _ A is located is carried by the CS network.
That is, first, the user signs up for an eMSC address of a home CS domain. At LTE network registration, HSS inserts the address to MME through ULR/ULA flow. Then, when the user initiates a call in the LTE network, after the LTE bearer of the calling party is established, the bearer between the calling ATGW and the IM-MGW of the calling home domain is established for use after switching through the extension message SRVCC Prepare PS to CS Request of the Sv interface. Finally, when the switch occurs, only the CS load between the visiting network and the user home domain needs to be updated. After the CS domain bearer update is completed, the eMSC informs the ATCF/ATGW to switch the bearer, and the bearer update is completed.
Wherein, the extended ULA message is defined 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, eMSC number AVP is 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-handover message SRVCC Prepare PS to CS Request of Sv interface is defined as follows:
according to the scheme provided by the embodiment of the invention, the switched target eMSC is anchored to the eMSC of the home network, and is uniformly anchored to the home network in advance during switching, and because the anchor point is fixed, the bearer from the home network to the IMS domain can be pre-established in the call establishment process, so that the bearer from the home network to the CS visiting network only needs to be updated during switching, the flow during switching can be further simplified, and the switching speed is improved.
Although the present invention has been described in detail hereinabove, the present invention is not limited thereto, and various modifications can be made by those skilled in the art in light of the principle of the present invention. Thus, modifications made in accordance with the principles of the present invention should be understood to fall within the scope of the present invention.
Claims (8)
1. An improved eSRVCC switching implementation method comprises the following steps:
the LTE network establishes an LTE bearer for VoLTE between the calling user terminal and the called user terminal according to the SIP call initiated by the calling user terminal;
after the LTE network establishes the LTE bearer, anchoring the calling user terminal to the ATGW;
a visiting MME of the LTE network acquires an eMSC address by utilizing an eMSC number inserted downwards by the HSS so as to establish a standby bearer from the anchored ATGW to an IM-MGW of a calling home domain through the eMSC of the LTE network;
during the VoLTE is carried out by the calling user terminal and the called user terminal through the LTE bearer, if the VoLTE is required to be carried by the circuit domain, the backup bearer is utilized to complete the establishment and the updating of the bearer at the circuit domain side, and the VoLTE is carried out continuously through the bearer at the circuit domain side;
wherein the eSRVCs refer to enhanced single radio voice call continuity; the SIP refers to a session initiation protocol; the ATGW refers to an access transfer gateway; the IM-MGW refers to an IP multimedia gateway.
2. The method of claim 1, the calling user terminal initiated SIP call preceded by:
a calling user terminal signs an eMSC address of a home circuit domain and stores the eMSC address to HSS of an LTE network;
the HSS inserts the eMSC number signed by the calling user terminal to the visiting MME;
wherein the eMSC refers to an enhanced mobile switching center; the HSS refers to a home subscriber server; the MME refers to a mobility management entity.
3. The method of claim 2, the HSS dropping an eMSC number to which the calling subscriber terminal subscribes to a visited MME comprising:
and the HSS sends an update position response to the visiting MME according to the update position request sent by the visiting MME of the calling user terminal, and inserts the carried signing eMSC number of the calling user terminal into the visiting MME.
4. The method of claim 1, the establishing, via the eMSC of the LTE network, the backup bearer from the anchored ATGW to the IM-MGW of the calling home domain comprising:
an eMSC of the LTE network receives a pre-switching request containing STN-SR and C-MSISDN parameters sent by a visiting MME;
the eMSC of the LTE network sends a request for adding an IP terminal at an IMS side to the IM-MGW of the calling home domain according to the pre-switching request;
an IM-MGW of a calling home domain of the LTE network returns information containing IP terminal parameters to the eMSC, so that the eMSC routes according to STN-SR and C-MSISDN parameters contained in the pre-switching request and sends an eSRVCC switching request message to an ATGW anchored by a calling user terminal;
the ATGW of the LTE network establishes a standby bearer to the IM-MGW of the calling home domain according to the eSRVCC switching request message;
wherein, the STN-SR refers to a session migration number; the C-MSISDN refers to the associated mobile station integrated service digital network number.
5. An improved eSRVCC handover implementation apparatus, comprising:
the method comprises the steps that an LTE bearing module is established, and the LTE bearing module is used for establishing LTE bearing for VoLTE between a calling user terminal and a called user terminal according to an SIP call initiated by the calling user terminal by an LTE network;
the method comprises the steps that a standby bearer module is established, the standby bearer module is used for anchoring a calling user terminal to an ATGW after an LTE network establishes an LTE bearer, a visiting MME of the LTE network acquires an eMSC address by utilizing an eMSC number inserted downwards by an HSS, and therefore the standby bearer from the anchored ATGW to an IM-MGW of a calling home domain is established through the eMSC of the LTE network;
and the switching module is used for completing establishment and updating of the circuit domain side bearer by using the standby bearer and continuing VoLTE through the circuit domain side bearer if the VoLTE needs to be carried by the circuit domain during the VoLTE is carried by the calling user terminal and the called user terminal through the LTE bearer.
6. The apparatus of claim 5, further comprising:
the calling user terminal is used for signing an eMSC address of a home circuit domain and storing the eMSC address into an HSS of an LTE network so that the HSS can insert the signed eMSC number into a visiting MME.
7. The apparatus of claim 6, further comprising a unit for dropping, by the HSS, an update location response to the visited MME according to the update location request sent by the visited MME of the calling user terminal, and dropping the carried signed eMSC number of the calling user terminal to the visited MME.
8. The apparatus of claim 5, wherein the setup backup bearer module is further specifically configured to receive, by the eMSC of the LTE network, a pre-handover request containing STN-SR and C-MSISDN parameters sent by the visited MME, send, by the eMSC of the LTE network, a request to add an IMs side IP terminal to the IM-MGW of the calling home domain according to the pre-handover request, enable the eMSC to route according to the STN-SR and C-MSISDN parameters contained in the pre-handover request by returning, to the eMSC, the IM-MGW of the calling home domain, and send, to the ATGW anchored by the calling user terminal, an eSRVCC handover request message, and the ATGW of the LTE network establishes the backup bearer to the IM-MGW of the calling home domain according to the eSRVCC handover request message.
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| CN102104848A (en) * | 2009-12-16 | 2011-06-22 | 中国移动通信集团公司 | Dual-mode single-standby voice service continuity realization method and Internet protocol (IP) multimedia subsystem |
| CN102469100A (en) * | 2010-11-08 | 2012-05-23 | 中兴通讯股份有限公司 | Method and system for achieving continuous single-mode voice conversation service |
| CN102769880A (en) * | 2011-05-04 | 2012-11-07 | 中兴通讯股份有限公司 | Method and system for switching single ratio voice call continuity (SRVCC) domain |
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| CN102104848A (en) * | 2009-12-16 | 2011-06-22 | 中国移动通信集团公司 | Dual-mode single-standby voice service continuity realization method and Internet protocol (IP) multimedia subsystem |
| CN102469100A (en) * | 2010-11-08 | 2012-05-23 | 中兴通讯股份有限公司 | Method and system for achieving continuous single-mode voice conversation service |
| CN102769880A (en) * | 2011-05-04 | 2012-11-07 | 中兴通讯股份有限公司 | Method and system for switching single ratio voice call continuity (SRVCC) domain |
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