CN102238673A - Reverse single-standby service continuity realization method and system - Google Patents
Reverse single-standby service continuity realization method and system Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
- H04W36/0022—Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies
- H04W36/00224—Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies between packet switched [PS] and circuit switched [CS] network technologies, e.g. circuit switched fallback [CSFB]
- H04W36/00226—Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies between packet switched [PS] and circuit switched [CS] network technologies, e.g. circuit switched fallback [CSFB] wherein the core network technologies comprise IP multimedia system [IMS], e.g. single radio voice call continuity [SRVCC]
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- H—ELECTRICITY
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- H04W76/00—Connection management
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Abstract
The invention relates to a reverse single-standby service continuity realization method and system. The reverse single-standby service continuity realization method comprises the following steps: a switching preparation notification step: the current mobile switching center (MSC) sends a switching request preparation notification to a terminal after receiving a switching request from a CS (Circuit Switched) domain; a transfer request step: the terminal sends a transfer request carrying the multimedia resource information M1 of the terminal to a service continuity application server (SCAS) through the original network after receiving the switching preparation notification; and a connection establishment step: the terminal initiates a multimedia connection establishment process between the terminal and a far end or triggers the SCAS to initiate the multimedia connection establishment process between the terminal and the far end. Through the method and system provided by the invention, when the terminal is switched from the CS domain to a PS (Packet Switched) domain, reverse single-standby service continuity can be realized.
Description
Technical field
The present invention relates to the communications field, relate in particular to reverse single standby service continuity implementation method and system in a kind of IP (network interconnection agreement, Internet Protocol are called for short IP) IP multimedia subsystem, IMS.
Background technology
IP Multimedia System (IP Multimedia Core Network Subsystem, be called for short IMS) be by third generation partner program (3rd Generation Partnership Project, abbreviation 3GPP) a kind of IP-based network framework that proposes, made up an opening and service environment flexibly, support multimedia application, can provide abundant multimedia service for the user.
In the IMS business system, key-course separates with operation layer, and key-course does not provide concrete business, and functions such as necessary triggering, route, charging only are provided to operation layer.
Professional triggering and controlled function are that CSCF (Call Session ControlFunction is called for short CSCF) is finished in the key-course.CSCF is divided into: Proxy Call Session Control Function (Proxy-CSCF, abbreviation P-CSCF), query call conversation control function (Interrogating-CSCF, be called for short I-CSCF) and service call conversation control function (Serving-CSCF, abbreviation S-CSCF) three type, that wherein take the main responsibility is S-CSCF, and I-CSCF is optional.
Operation layer is to be made up of a series of application servers (Application Server is called for short AS), and concrete business service can be provided, and AS can be an independent entity, also may reside among the S-CSCF.
Key-course (S-CSCF) calls the business on the AS according to user's professional triggering of CAMEL-Subscription-Information control, realizes business function.
End-to-end equipment in the session is called subscriber equipment (User Equipment, be called for short UE), be responsible for mutual with the user, the UE that has has the mode of multiple access network, comprise packet switch (Packet Switch is called for short PS) territory access network, by the PS territory access network of other non-3GPP by 3GPP, even can be by circuit switching (Circuit Switch, be called for short CS) territory access network etc.
If the CS network configuration (the enhanced Mobile Switch Center of enhancing mobile switching centre, be called for short eMSC), provide SIP (Session Initial Protocol by eMSC, initial session protocol) interface comes and the IMS network interaction, and then IMS network and CS network can realize by eMSC alternately.
For UE with plurality of access modes, if this UE constantly can only use a kind of access way, then it is carrying out talk business under the access way of 2/3G network, because of talk business is provided by the CS territory in the 2/3G network, other are local and when needing to change its access way of using as LTE (Long Term Evaluation--Long Term Evolution) network or HSPA (visit of High Speed PacketAccess--high-speed packet) network insertion when UE moves to, the talk business that UE and network can provide certain mode that UE is being carried out is not interrupted, because of talk business is provided by the PS territory in these networks, we are referred to as oppositely singly to treat the terminal traffic continuity such ability, be called for short reverse single standby service continuity (reverseSingle Radio Voice Call Continuity--rSRVCC), corresponding with it, then treat the terminal traffic continuity if UE moves to the 2/3G network from LTE network or HSPA network, abbreviate single standby service continuity as for the forward list.
When realizing reverse single standby service continuity, should comprise two processes, a process is the handoff procedure of former network to objective network, to be terminal be connected the process of foundation with medium between the far-end for another.Just present, handoff procedure has in the industry cycle had clear and definite realization flow (as shown in Figure 1), but how to initiate terminal is connected the process of foundation with medium between the far-end and is still waiting to propose clear and definite solution.
Fig. 1 is existing reverse single standby service continuity flow chart, described between UE-1 and UE-2 and set up conversation, UE-1 inserts by the CS territory of 2/3G network to set up conversation, therefore conversing, what connect UE-1 in the media path is that one section CS medium connects, after reverse single standby service continuity takes place in UE-1, how UE-1 switches to the process in PS territory from the CS territory, comprise the steps:
Step 101, UE-1 send measurement report to the former network that is its service, to report the cell signal strength metrical information;
Step 102, be more suitable for service according near the PS objective network each cell signal strength information is judged in the measurement report for the base station system of the former network of UE-1 service into UE-1, so handover operation is carried out in decision, the base station system of former network sends handoff request to MSC, such as sending Handover required (handoff request) message;
Step 103, MSC send handoff request to the controlled entity of objective network, and such as sending CS to PSHandover Request, this controlled entity can be the MME of long-term evolving network (LTE) or the SGSN of high-speed data accesses network (HSPA);
If step 104 UE-1 also has data service, then the base station system of former network also can send handoff request to former network data territory controlled entity (also being SGSN), such as sending Relocation Required (handoff request) message;
After step 105, the step 104, former network data territory controlled entity sends handoff request to the objective network controlled entity, such as sending Forward Relocation Request message;
Step 106, objective network controlled entity send handoff request to the objective network base station system, such as sending Handover Request (handoff request) message;
Step 107, objective network base station system are responded switching response message, such as sending HandoverRequest Acknowledge message;
After step 108, objective network controlled entity are received handoff response, send switching response message, such as sending CS to PS Handover Response message to MSC;
Step 109, MSC send switching command to former network base station system, such as sending HandoverCommand (switching command) message;
If step 110 UE-1 also has data service, then the objective network controlled entity also can send handoff response to former network data territory controlled entity, such as sending Forward Relocation Response message;
After step 111, the step 110, former network data territory controlled entity sends switching command to former network base station system, such as sending Relocation Command message;
Step 112, former network base station system send switching command to UE-1, such as sending HO fromUTRAN/GERAN message;
Step 113, UE-1 carry out switching, switch in the objective network, adhere to request to the controlled entity transmission of objective network then, such as sending Attach Request message;
Step 114, objective network controlled entity send to UE-1 and adhere to acceptance message, such as sending AttachAccept message.
Summary of the invention
Technical problem to be solved by this invention is, a kind of reverse single standby service continuity implementation method and system are provided, with in terminal when the CS territory switches to the PS territory, realize reverse single standby service continuity.
In order to address the above problem, the invention provides the successional implementation method of a kind of reverse single standby service, this method comprises:
Switch to prepare notifying process, after handoff request from the CS territory is received by current mobile switching centre (MSC), send to switch to terminal and prepare notice;
Transfer request step, described terminal send transfer request by former network to business continuance application server (SC AS) after receiving described switching preparation notice, carry the media resource information M1 of described terminal;
Connect establishment step, described terminal is initiated the medium connection building process between described terminal and the far-end, or triggers described SC AS and initiate medium connection building process between described terminal and the far-end.
The present invention also provides the successional realization of a kind of reverse single standby service system, and this system comprises:
Mobile switching centre (MSC) comprises the switching controls module, and when described MSC was current MSC, described switching controls module was used for after the handoff request of receiving from the CS territory, sends to switch to terminal and prepares notice;
Described terminal comprises connecting sets up control module, described medium connection is set up control module and is used to receive described switching preparation notice, and after receiving described switching preparation notice, send transfer request by former network to business continuance application server (SC AS), wherein carry the media resource information M1 of described terminal; Also be used to initiate the medium connection building process between described terminal and the far-end, or trigger described SC AS and initiate medium connection building process between described terminal and the far-end.
The inventive method and system are auxiliary by terminal, initiate transfer request by former network to business continuance application server (SC AS) by terminal, and terminal is initiated the medium connection building process between described terminal and the far-end, or trigger described SC AS and initiate medium connection building process between described terminal and the far-end, make terminal when the CS territory switches to the PS territory, guarantee reverse single standby service continuity.
Description of drawings
Fig. 1 is existing reverse single standby service continuity implementation method flow chart;
Fig. 2 is the flow chart of the reverse single standby service continuity implementation method embodiment one of the present invention;
Fig. 3 is the flow chart of the reverse single standby service continuity implementation method embodiment two of the present invention;
Fig. 4 is the flow chart of the reverse single standby service continuity implementation method embodiment three of the present invention;
Fig. 5 is the flow chart of the reverse single standby service continuity implementation method embodiment four of the present invention;
Fig. 6 is the flow chart of the reverse single standby service continuity implementation method embodiment five of the present invention;
Fig. 7 is the flow chart of the reverse single standby service continuity implementation method embodiment six of the present invention;
Fig. 8 is the schematic flow sheet of the reverse single standby service continuity implementation method of the present invention.
Embodiment
Core concept of the present invention is, auxiliary by terminal, initiate transfer request by former network to business continuance application server (SC AS) by terminal, and terminal is initiated the medium connection building process between described terminal and the far-end, or trigger described SC AS and initiate medium connection building process between described terminal and the far-end, make terminal when the CS territory switches to the PS territory, guarantee reverse single standby service continuity.
Current MSC refers to participate in the MSC of transfer process among the present invention, if MSC does not change in handoff procedure, this MSC is the said current MSC of the present invention; If MSC need switch to target MSC from Anchor MSC in the handoff procedure, then target MSC is the said current MSC of the present invention.
As shown in Figure 8, the present invention comprises to the successional implementation method of single standby service:
Step 10: switch to prepare notifying process, after handoff request from the CS territory is received by current mobile switching centre (MSC), send to switch to terminal and prepare notice;
Step 20: transfer request step, described terminal send transfer request by former network to business continuance application server (SC AS) after receiving described switching preparation notice, carry the media resource information M1 of described terminal;
Step 30: connect establishment step, described terminal is initiated the medium connection building process between described terminal and the far-end, or triggers described SC AS and initiate medium connection building process between described terminal and the far-end.
Idiographic flow is referring to following examples one to six.
During the described current MSC of signaling grappling, referring to following examples one, two, five, in the described connection establishment step, described terminal triggers the method that described SC AS initiates the medium connection building process between described terminal and the far-end and is:
After described SC AS receives described transfer request, send the message that connects to described terminal by described current MSC.
During the described current MSC of medium grappling, referring to following examples one:
Described switching prepares all to carry session association information in notice, described transfer request and the message that connects;
In the described connection establishment step, described current MSC carries described current MSC in the described message that connects that described terminal is transmitted media resource information;
After described current MSC receives the message of carrying media resource information of described terminal, set up with described terminal between medium be connected;
Described current MSC is connected with described medium between the described terminal according to the described current MSC of described session association associating information and described current MSC is connected with medium between the described far-end.
During the current MSC of signaling grappling, connect a kind of mode of setting up successfully in order to guarantee medium: connect in the establishment step, after described current MSC receives the message of the described message that connects of refusal of described terminal transmission, the described message that connects of retry forwarding.Referring to embodiment one, two.
During the current MSC of signaling grappling, in order to guarantee that medium connect the another kind of mode of setting up successfully and are: connect in the establishment step, described current MSC receives after switching that the objective network controlled entity sends finishes notice, transmits the described message that connects to described terminal again.Referring to embodiment five.
Described objective network controlled entity sends to switch under following arbitrary situation finishes notice:
After described current MSC receives handoff request from the CS territory, send switching notice, after the described terminal of described objective network controlled entity perception is linked into objective network, sends to switch to described current MSC and finish notice to described objective network controlled entity; Or,
After described terminal is finished switching, send switching to described objective network controlled entity and finish indication, after described objective network controlled entity receives described indication, send switching to described current MSC and finish notice.
During the current MSC of not grappling of signaling, referring to embodiment three, connect in the establishment step, described terminal triggers the method that described SC AS initiates the medium connection building process between described terminal and the far-end and is:
After described SC AS receives described transfer request, send the message that connects to described terminal.
Referring to embodiment two, three and five, connect establishment step and comprise:
After described SC AS receives described transfer request, use the media resource information M1 in the described transfer request to upgrade described far-end;
After described SC AS receives the message of carrying media resource information M2 of described far-end, described media resource information M2 is sent by the described message that connects;
After described terminal receives the described message that connects, send message and carry the media resource information M3 of described terminal, described media resource information M3 is contained among the described media resource information M1.
During the current MSC of not grappling of signaling, sets up successfully, connect in the establishment step in order to guarantee that medium connect, after described SC AS receives the message of the described message that connects of refusal of described terminal transmission, the described message that connects of retry forwarding.Referring to embodiment three.
During the current MSC of not grappling of signaling, referring to embodiment four and six, connect in the establishment step, the method that described terminal is initiated the medium connection building process between described terminal and the far-end is:
Described terminal is initiated the medium connection by described transfer request and is set up, or described terminal sends second transfer request initiation medium that carry media resource information at objective network and connects foundation;
After described SC AS receives described transfer request or described second transfer request, send the response message of the media resource information of carrying far-end to described terminal.
Describe the present invention below in conjunction with drawings and Examples.
After MSC receives handoff request from the CS territory among the present invention, can send handoff request, also can not send handoff request to purpose network control entity.
Embodiment one
Fig. 2 is the flow chart of reverse single standby service continuity implementation method embodiment one of the present invention, described between UE-1 and UE-2 and set up conversation, UE-1 sets up conversation by the CS territory of 2/3G network, therefore conversing, what connect UE-1 in the media path is that one section CS medium connects, when moving, UE-1 needs to change the PS territory of its access way of using as LTE or HSPA, subsequent session is set up medium by the medium grappling of target MSC and is connected, and target MSC is under the situation of Anchor MSC, and UE-1 realizes that the successional process of reverse single standby service comprises the steps:
Step 201, UE-1 are set up session by CS territory and MSC and UE-1, and MSC supports the IMS signaling, and in the signaling paths of former session, the session signaling path is by way of SC AS;
Step 202～203, identical with step 101～102 of Fig. 1;
Step 204, MSC receive the handoff request from the CS territory, send to switch to UE-1 immediately and prepare message;
Require UE-1 to prepare the message of switching such as sending by short message (SMS) or unstructured supplementary data traffic (UnstructuredSupplementary Service Data--USSD), message arrives UE-1 by the base station system of former network, carry the grappling indication information of MSC in the message, such as the signaling grappling (signaling grappling indication) of the identification information that carries MSC to indicate follow-up IMS process need MSC, and (the medium grappling is indicated to carry the indication information of this MSC in media path, with the indication UE session by the MSC grappling), also carry session association information, or only with the identification information of MSC, and itself also can be used for session association this identification information, such as identifying target MSC with user name host name form, wherein user name partly can be used for session association.
After step 205, UE-1 receive and switch preparation message, optionally, can respond to switch and prepare response message, such as sending this message by SMS or USSD, message arrives MSC by the base station system of former network;
Step 206, UE-1 send transfer request to SC AS after receiving and switching preparation message;
Such as, if UE has the PS territory to use at former network, then can send with SC AS is INVITE (invitation) message of target, otherwise, can send INVITE to SC AS by USSD, message is carried the media resource information that UE-1 will use at objective network, and such as IP address, port numbers, encoder information etc., message is also carried the grappling indication information that obtains in the step 204;
Understandably, the media resource information of UE-1 in the transfer request that UE-1 sends is in sending to the process of SCAS, may be revised, upgrade by other network elements on the signaling paths, thereby causing the media resource information in the transfer request that SC AS receives no longer has been original media resource information, but this media resource information remains the media resource information of related UE-1.
Media resource information among other embodiment all has similar situation, promptly make a start and the media resource information of receiving terminal may change to some extent, but essence object pointed does not change.
Step 205 can be after step 206, that is, UE-1 sends to switch after sending out transfer request again and prepares response message.
If it is professional that step 207 UE-1 also has in the PS territory of former network, the PS of operative norm is to the PS switching flow, and its process is identical with step 104～109 of Fig. 1;
After step 208, step 204 or the step 205, MSC sends switching command to the CS territory, and message arrives the base station system of former network;
The base station system of step 209, former network sends switching command to UE-1, requires UE-1 to switch to objective network;
After step 210, UE-1 receive switching command, be modulated to objective network and insert;
After step 211, the step 206, SC AS receives transfer request, according to the medium in the grappling indication
Grappling indication judgement need not to upgrade far-end, so do not upgrade far-end;
Step 212, optional, SC AS responds transfer request, gives UE-1 such as sending " 200OK " message;
Step 213, after the step 211, SC AS receives transfer request, SC AS finds the user ID (calling user information itself just can be the user ID of UE-1) of UE-1 by the calling user information in the transfer request, send connect message by the PS territory to UE-1 with this user ID, such as sending INVITE, SC AS requires this message travels MSC that connects, such as in the header field of message related to calls, routing iinformation being set, the identification information that comprises MSC in the routing iinformation, if this identification information can not be used for session association, then SC AS also will carry the session association information that obtains in the step 206 in this connects message;
Step 214, the message that connects arrive MSC, and MSC is according to the former session of session association associating information, and forwarding connects message to UE-1, the media resource information of carrying MSC in the message of transmitting that connects;
At this moment, UE-1 may not insert objective network timely, if this fashion of UE-1 is not finished the operation that inserts objective network, the message of transmitting that connects can be rejected, receive the refuse information of the message that connects of forwarding as MSC after, retry is transmitted the operation of the message that connects, and is accepted up to this message that connects.
Step 215, UE-1 receive the message that connects, and reply this message that connects, and such as sending " 200OK " message, message is carried the media resource information of UE-1;
Step 216, the response message that connects are by way of MSC, and MSC basis media resource information is wherein finished the media negotiation with UE-1, and MSC transmits the response message that connects and gives SC AS;
So far, set up the IMS medium between UE-1 and MSC and be connected 2, MSC connects 2 with newly-built IMS medium and is connected 1 with the IMS medium of former session and connects, and UE-1 can be continued and UE-2 converses.
In the present embodiment, identification information and session association information that MSC can not be carried in grappling indication in the step 204, but increase the media resource information that links to each other with UE-1 of being used for carry MSC, so SC AS can not require the message travels MSC that connects in the step 213, SC AS in the message that connects, carry acquisition MSC be used for the media resource information that links to each other with UE-1, so step 213 just no longer arrives UE-1 by way of MSC, step 214 has not just had, step 215 also no longer arrives SC AS by way of MSC, and step 216 has not just had.
Embodiment two
Fig. 3 is the flow chart of reverse single standby service continuity implementation method embodiment two of the present invention, described between UE-1 and UE-2 and set up conversation, UE-1 sets up conversation by the CS territory of 2/3G network, therefore conversing, what connect UE-1 in the media path is that one section CS medium connects, when moving, UE-1 needs to change the PS territory of its access way of using as LTE or HSPA, subsequent session by target MSC the signaling grappling but non-medium grappling set up medium and connect, and target MSC is not under the situation of Anchor MSC, UE-1 and SC AS are undertaken alternately by MSC, and UE-1 realizes that the successional process of reverse single standby service comprises the steps:
Step 301, UE-1 are set up session by CS territory and Anchor MSC and UE-1, and target MSC supports the IMS signaling but not in signaling paths, the session signaling path is by way of SC AS;
Step 302～303, identical with step 101～102 of Fig. 1;
Step 304, Anchor MSC are received handoff request, initiate the inter-office switchover process in the CS territory of standard to target MSC, and Anchor MSC sends handoff request to target MSC;
Step 305, MSC receive the handoff request from the CS territory, send to switch to UE-1 immediately and prepare message;
Require UE-1 to prepare the message of switching such as sending by short message (SMS) or unstructured supplementary data traffic (UnstructuredSupplementary Service Data--USSD), message arrives UE-1 by the base station system of former network, carry the grappling indication information of MSC in the message, such as the identification information that carries MSC, also carry session association information, or only with the identification information of MSC, and itself also can be used for session association this identification information, such as identifying target MSC with user name host name form, wherein user name partly can be used for session association;
After step 306, UE-1 receive and switch preparation message, optionally, can respond to switch and prepare response message, such as sending this message by SMS or USSD, message arrives MSC by the base station system of former network;
Step 307, UE-1 send transfer request to SC AS after receiving and switching preparation message;
Such as, if UE has the PS territory to use at former network, then can send with SC AS is INVITE (invitation) message of target, otherwise, can send INVITE to SC AS by USSD, message is carried the media resource information that UE-1 will use at objective network, and such as IP address, port numbers, encoder information etc., message is also carried the grappling indication information that obtains in the step 305;
Step 306 can be after step 307, that is, UE-1 sends to switch after sending out transfer request again and prepares response message.
If it is professional that step 308 UE-1 also has in the PS territory of former network, the PS of operative norm is to the PS switching flow, and its process is identical with step 104～109 of Fig. 1;
After step 309, step 305 or the step 306, target MSC sends handoff response to the Anchor MSC in CS territory, and message arrives Anchor MSC;
Step 310, Anchor MSC send switching command to the CS territory, and message arrives the base station system of former network;
The base station system of step 311, former network sends switching command to UE-1, requires UE-1 to switch to objective network;
After step 312, UE-1 receive switching command, be modulated to objective network and insert;
After step 313, the step 307, SC AS receives transfer request, send update request to UE-2, such as sending UPDATE (renewal) message or reINVITE (heavily inviting) message, message is carried the media resource information of the UE-1 that obtains in the step 307, the form of the media resource information of the UE-1 in the media resource information of the UE-1 in the step 313 and the step 307 may be different, and when using USSD to send transfer request such as step 307, but content is consistent;
Step 314, updating message arrive UE-2 by way of CSCF, and UE-2 responds update request, and such as sending " 200OK " message, message is carried the media resource information of UE-2;
Step 315, optional, after the step 314, SC AS responds transfer request, gives UE-1 such as sending " 200OK " message;
Step 316, after the step 314, SC AS receives the renewal response message, SC AS finds the user ID (calling user information itself just can be the user ID of UE-1) of UE-1 by the calling user information in the transfer request, send connect message by the PS territory to UE-1 with this user ID, such as sending INVITE, SC AS requires this message travels MSC that connects, such as in the header field of message related to calls, routing iinformation being set, the identification information that comprises MSC in the routing iinformation, if this identification information can not be used for session association, then SC AS also will carry the session association information that obtains in the step 307 in this connects message;
Step 317, the message that connects arrive MSC, and MSC is according to the former session of session association associating information, and forwarding connects message to UE-1;
At this moment, UE-1 may not insert objective network timely, if this fashion of UE-1 is not finished the operation that inserts objective network, the message of transmitting that connects can be rejected, receive the refuse information of the message that connects of forwarding as MSC after, retry is transmitted the operation of the message that connects, and is accepted up to this message that connects.
Step 318, UE-1 receive the message that connects, and reply this message that connects, and such as sending " 200OK " message, message is carried the media resource information of UE-1, and its content is contained in the media resource information content that provides in the step 307;
Step 319, the response message that connects arrive SC AS by way of MSC and CSCF;
So far, set up the IMS medium between UE-1 and UE-2 and be connected 1, make UE-1 can continue conversation with UE-2.
In this example, if Anchor MSC and target MSC are same MSC, then in the step 301, target MSC is also in the signaling paths of former session, and step 304 and 309 has not just had.
Embodiment three
Fig. 4 is the flow chart of reverse single standby service continuity implementation method embodiment three of the present invention, described between UE-1 and UE-2 and set up conversation, UE-1 inserts by the CS territory and sets up conversation, therefore conversing, what connect UE-1 in the media path is that one section CS medium connects, when moving, UE-1 needs to change the PS territory of its access way of using as LTE or HSPA, target MSC is not in the signaling paths of subsequent session, and target MSC is not under the situation of Anchor MSC, UE-1 and SC AS directly carry out alternately, realize that the successional process of reverse single standby service comprises the steps:
Step 401～404,301～304 identical with Fig. 3;
Step 405, MSC receive the handoff request from the CS territory, send to switch to UE-1 immediately and prepare message, require UE-1 to prepare the message of switching such as sending by short message (SMS) or unstructured supplementary data traffic (UnstructuredSupplementary Service Data--USSD), message arrives UE-1 by the base station system of former network;
After step 406, UE-1 receive and switch preparation message, optionally, can respond to switch and prepare response message, such as sending this message by SMS or USSD, message arrives MSC by the base station system of former network;
After step 407, UE-1 receive and switch preparation message, send transfer request to SC AS, such as, if UE has the PS territory to use at former network, then can send with SC AS is INVITE (invitation) message of target, otherwise, can send INVITE to SC AS by USSD, message is carried the media resource information that UE-1 will use at objective network, such as IP address, port numbers, encoder information etc.;
Step 408～415, identical with step 308～315 of Fig. 3;
After step 416, the step 414, SC AS receives the renewal response message, SC AS finds the user ID (calling user information itself just can be the user ID of UE-1) of UE-1 by the calling user information in the transfer request, send connect message by the PS territory to UE-1 with this user ID, such as sending INVITE, SC AS does not require this message travels MSC that connects;
At this moment, UE-1 may not insert objective network timely, if this fashion of UE-1 is not finished the operation that inserts objective network, the message of transmitting that connects can be rejected, receive the refuse information of the message that connects of forwarding as SC AS after, retry is transmitted the operation of the message that connects, and is accepted up to this message that connects.
Step 417, UE-1 receive the message that connects, reply this message that connects, such as sending " 200OK " message, message is carried the media resource information of UE-1, its content is contained in the media resource information content that provides in the step 407, and the response message that connects arrives SC AS by way of CSCF;
So far, set up the IMS medium between UE-1 and UE-2 and be connected 1, make UE-1 can continue conversation with UE-2.
In this example, if Anchor MSC and target MSC are same MSC, then in the step 401, target MSC is also in the signaling paths of former session, and step 404 and 409 has not just had.
Embodiment four
Fig. 5 is the flow chart of reverse single standby service continuity implementation method embodiment four of the present invention, described between UE-1 and UE-2 and set up conversation, UE-1 inserts by the CS territory and sets up conversation, therefore conversing, what connect UE-1 in the media path is that one section CS medium connects, the MSC that UE-1 and UE-2 need not grappling sets up medium and is connected, need to change its access way of using be not under the situation of Anchor MSC as PS territory and the target MSC of LTE or HSPA when UE-1 moves, UE-1 and SC AS realize that by once mutual the successional process of reverse single standby service comprises the steps:
Step 501, UE-1 are set up session by CS territory and Anchor MSC and UE-1, and target MSC is not in signaling paths, and the session signaling path is by way of SC AS, and UE-1 can use its PS territory to send data in former network;
Step 502～506,402～406 identical with Fig. 4;
Step 507, UE-1 send transfer request to SC AS after receiving and switching preparation message;
Because UE-1 has the PS territory to use at former network, then sending with SC AS is INVITE (invitation) message of target, and message is carried the media resource information that UE-1 will use at objective network, such as IP address, port numbers, encoder information etc.;
Step 508～514,408～414 identical with Fig. 4;
After step 515, the step 514, SC AS receives the renewal response message, and SC AS responds transfer request, and such as sending " 200OK " message, message is carried the media resource information that obtains in the step 514;
At this moment, UE-1 may not insert objective network timely, if this fashion of UE-1 is not finished the operation that inserts objective network, shift response and can be rejected (such as receiving BYE message), receive the refuse information of transfer response as SC AS after, retry sends the operation of shifting response, is accepted up to this transfer response.
So far, set up the IMS medium between UE-1 and UE-2 and be connected 1, make UE-1 can continue conversation with UE-2.
In this example, if Anchor MSC and target MSC are same MSC, then in the step 501, target MSC is also in the signaling paths of former session, and step 504 and 509 has not just had.
Embodiment five
Fig. 6 is the flow chart of reverse single standby service continuity implementation method embodiment five of the present invention, described between UE-1 and UE-2 and set up conversation, UE-1 inserts by the CS territory and sets up conversation, therefore conversing, what connect UE-1 in the media path is that one section CS medium connects, the MSC that UE-1 and UE-2 need not grappling sets up medium and is connected, need to change its access way of using be not under the Anchor MSC situation as PS territory and the target MSC of LTE or HSPA when UE-1 moves, and realizes that the successional process of reverse single standby service comprises the steps:
Step 601～615, identical with step 301～315 of Fig. 3;
Step 616, after the step 614, SC AS receives the renewal response message, SC AS finds the user ID (calling user information itself just can be the user ID of UE-1) of UE-1 by the calling user information in the transfer request, send connect message by the PS territory to UE-1 with this user ID, such as sending INVITE, SC AS requires this message travels MSC that connects, such as in the header field of message related to calls, routing iinformation being set, the identification information that comprises MSC in the routing iinformation, if this identification information can not be used for session association, then SC AS also will carry the session association information that obtains in the step 307 in this connects message, the message travels target MSC, target MSC is according to the former session of session association associating information, but do not transmit this message immediately;
Step 617, UE-1 switch to objective network, send notice to the objective network controlled entity and switch the message of finishing, carry Attach Request (adhering to request) message or Tracking Area Update (path area update) message of switching the indication come from the CS territory such as transmission, or carry and switch Service Request (service request) message of indicating etc.;
The controlled entity of step 618, objective network sends to switch to target MSC finishes notification message, such as sending PS to CS Handover Complete Notification message, the controlled entity of objective network can be determined target MSC by the target cell information that UE-1 inserts;
After step 619, target MSC are received and finished notification message from the switching of objective network controlled entity, transmit the message that connects of step 616 and give UE-1;
Step 620～621, identical with step 318～319 of Fig. 3;
So far, set up the IMS medium between UE-1 and UE-2 and be connected 1, make UE-1 can continue conversation with UE-2.
In this example, step 617 is finished for UE notification target network control network element CS switches to PS, in actual the enforcement, can by MSC notification target network control network element the switching of CS to PS take place in step 604 back also, perceive after UE inserts objective network when objective network control network element like this, but objective network control network element execution in step 618 just.
In this example, if Anchor MSC and target MSC are same MSC, then in the step 601, target MSC is also in the signaling paths of former session, and step 604 and 609 has not just had.
Embodiment six
Fig. 7 is reverse single standby service continuity implementation method flow chart six of the present invention, described between UE-1 and UE-2 and set up conversation, UE-1 inserts by the CS territory and sets up conversation, therefore conversing, what connect UE-1 in the media path is that one section CS medium connects, need to change its access way of using be not under the situation of Anchor MSC as PS territory and the target MSC of LTE or HSPA when UE-1 moves, and UE-1 realizes that the successional process of reverse single standby service comprises the steps:
Step 701～715,401～415 identical with Fig. 4;
After step 716, UE-1 finish switching, UE-1 initiates transfer request in the PS territory of objective network, send INVITE such as the target that is designated with SC AS, message is carried the media resource information of UE-1, its media resource information content is contained in the media resource information content of the UE-1 in the step 707, and message travels CSCF arrives SC AS;
Step 717, SC AS receive the transfer request that UE-1 sends, and respond this transfer request, and such as sending " 200OK " message, message is carried the media resource information of the UE-2 that obtains in the step 714;
So far, set up the IMS medium between UE-1 and UE-2 and be connected 1, make UE-1 can continue conversation with UE-2.
In this example, if Anchor MSC and target MSC are same MSC, then in the step 701, target MSC is also in the signaling paths of former session, and step 704 and 709 has not just had.
For realizing above method, the present invention also provides the successional realization of a kind of reverse single standby service system, and this system comprises:
Mobile switching centre (MSC) comprises the switching controls module, and when described MSC was current MSC, described switching controls module was used for after the handoff request of receiving from the CS territory, sends to switch to terminal and prepares notice;
Described terminal comprises connecting sets up control module, described medium connection is set up control module and is used to receive described switching preparation notice, and after receiving described switching preparation notice, send transfer request by former network to business continuance application server (SC AS), wherein carry the media resource information M1 of described terminal; Also be used to initiate the medium connection building process between described terminal and the far-end, or trigger described SC AS and initiate medium connection building process between described terminal and the far-end.
Corresponding to embodiment one, two, five, described system also comprises SC AS, described SC AS comprises connecting and sets up control module, is used to receive described transfer request, and sends the message that connects by described current MSC to described terminal after receiving described transfer request.
Corresponding to embodiment one, described switching prepares all to carry session association information in notice, transfer request and the message that connects; Described MSC comprises that also connect message transmitting module and connection set up module, be used to receive the message that connects that described SC AS sends, and to the described message that connects of terminal forwarding, the media resource information of carrying described MSC in the message that connects of forwarding; After the message of carrying media resource information that module receives described terminal is set up in described connection, set up with described terminal between medium be connected, also be used for being connected with described medium between the described terminal and described current MSC is connected with medium between the described far-end according to the described current MSC of described session association associating information.
Corresponding to embodiment one, two, the connection of described MSC is set up module and also is used for after the message of receiving the described message that connects of refusal that described terminal sends, and retry is transmitted the described message that connects.
Corresponding to embodiment five, the connection of described MSC is set up module after notice is finished in the switching that receives the transmission of objective network controlled entity, transmits the described message that connects to described terminal again.
Described system also comprises the objective network controlled entity; The switching controls module of described MSC also is used for sending switching notice to described objective network controlled entity after the handoff request of receiving from the CS territory; Described objective network controlled entity is used to receive described switching notice, also is used for after the described terminal of perception inserts objective network or receives that switching that described terminal sends finishes the indication back and send to switch to described MSC and finish notice.
Corresponding to embodiment three, described system also comprises SC AS, and described SC AS comprises connecting and sets up control module, is used to receive described transfer request, and sends the message that connects to described terminal after receiving described transfer request.
Corresponding to embodiment three, the connection of described SC AS is set up control module and also is used for after the message of receiving the described message that connects of refusal that described terminal sends, and retry is transmitted the described message that connects.
Corresponding to embodiment two, three and five, control module is set up in the connection of described SC AS, receive described transfer request after, also be used for using the media resource information M1 of described transfer request to upgrade described far-end; After receiving the message of carrying media resource information M2 of described far-end, described media resource information M2 is sent by the described message that connects; The connection of described terminal is set up control module and also is used to receive the described message that connects, and after receiving the described message that connects, the message of the media resource information M3 of described terminal is carried in transmission, and described media resource information M3 is contained among the described media resource information M1.
Corresponding to embodiment four, six, the connection of described terminal is set up control module and is initiated the mode of the medium connection building process between described terminal and the far-end and be: initiate medium by described transfer request and be connected foundation, or, send second transfer request of carrying media resource information at objective network and initiate medium connection foundation; Described system also comprises SC AS, described SC AS also comprises connecting and sets up module, be used to receive described transfer request or described second transfer request, and the response message that after receiving described transfer request or described second transfer request, sends the media resource information of carrying far-end to described terminal.
Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (20)
1. successional implementation method of reverse single standby service is characterized in that this method comprises:
Switch to prepare notifying process, after handoff request from the CS territory is received by current mobile switching centre (MSC), send to switch to terminal and prepare notice;
Transfer request step, described terminal send transfer request by former network to business continuance application server (SC AS) after receiving described switching preparation notice, carry the media resource information M1 of described terminal;
Connect establishment step, described terminal is initiated the medium connection building process between described terminal and the far-end, or triggers described SC AS and initiate medium connection building process between described terminal and the far-end.
2. the method for claim 1 is characterized in that, during the described current MSC of signaling grappling, in the described connection establishment step, described terminal triggers the method that described SC AS initiates the medium connection building process between described terminal and the far-end and is:
After described SC AS receives described transfer request, send the message that connects to described terminal by described current MSC.
3. method as claimed in claim 2 is characterized in that, during the described current MSC of medium grappling:
Described switching prepares all to carry session association information in notice, described transfer request and the message that connects;
In the described connection establishment step, described current MSC carries described current MSC in the described message that connects that described terminal is transmitted media resource information;
After described current MSC receives the message of carrying media resource information of described terminal, set up with described terminal between medium be connected;
Described current MSC is connected with described medium between the described terminal according to the described current MSC of described session association associating information and described current MSC is connected with medium between the described far-end.
4. method as claimed in claim 2 is characterized in that: connect in the establishment step, after described current MSC received the message of the described message that connects of refusal that described terminal sends, retry was transmitted the described message that connects.
5. method as claimed in claim 2 is characterized in that: connect in the establishment step, described current MSC receives after switching that the objective network controlled entity sends finishes notice, transmits the described message that connects to described terminal again.
6. method as claimed in claim 5 is characterized in that, described objective network controlled entity sends to switch under following arbitrary situation finishes notice:
After described current MSC receives handoff request from the CS territory, send switching notice, after the described terminal of described objective network controlled entity perception is linked into objective network, sends to switch to described current MSC and finish notice to described objective network controlled entity; Or,
After described terminal is finished switching, send switching to described objective network controlled entity and finish indication, after described objective network controlled entity receives described indication, send switching to described current MSC and finish notice.
7. the method for claim 1 is characterized in that, connects in the establishment step, and described terminal triggers the method that described SC AS initiates the medium connection building process between described terminal and the far-end and is:
After described SC AS receives described transfer request, send the message that connects to described terminal.
8. method as claimed in claim 7 is characterized in that: connect in the establishment step, after described SC AS received the message of the described message that connects of refusal that described terminal sends, retry was transmitted the described message that connects.
9. as claim 2 or 7 described methods, it is characterized in that, connect establishment step and comprise:
After described SC AS receives described transfer request, use the media resource information M1 in the described transfer request to upgrade described far-end;
After described SC AS receives the message of carrying media resource information M2 of described far-end, described media resource information M2 is sent by the described message that connects;
After described terminal receives the described message that connects, send message and carry the media resource information M3 of described terminal, described media resource information M3 is contained among the described media resource information M1.
10. the method for claim 1 is characterized in that, connects in the establishment step, and the method that described terminal is initiated the medium connection building process between described terminal and the far-end is:
Described terminal is initiated the medium connection by described transfer request and is set up, or described terminal sends second transfer request initiation medium that carry media resource information at objective network and connects foundation;
After described SC AS receives described transfer request or described second transfer request, send the response message of the media resource information of carrying far-end to described terminal.
11. the successional realization of a reverse single standby service system is characterized in that this system comprises:
Mobile switching centre (MSC) comprises the switching controls module, and when described MSC was current MSC, described switching controls module was used for after the handoff request of receiving from the CS territory, sends to switch to terminal and prepares notice;
Described terminal comprises connecting sets up control module, described medium connection is set up control module and is used to receive described switching preparation notice, and after receiving described switching preparation notice, send transfer request by former network to business continuance application server (SC AS), wherein carry the media resource information M1 of described terminal; Also be used to initiate the medium connection building process between described terminal and the far-end, or trigger described SC AS and initiate medium connection building process between described terminal and the far-end.
12. system as claimed in claim 11, it is characterized in that: described system also comprises SC AS, described SC AS comprises connecting and sets up control module, is used to receive described transfer request, and sends the message that connects by described current MSC to described terminal after receiving described transfer request.
13. system as claimed in claim 12 is characterized in that: described switching prepares all to carry session association information in notice, transfer request and the message that connects; Described MSC comprises that also connect message transmitting module and connection set up module, be used to receive the message that connects that described SC AS sends, and to the described message that connects of terminal forwarding, the media resource information of carrying described MSC in the message that connects of forwarding; After the message of carrying media resource information that module receives described terminal is set up in described connection, set up with described terminal between medium be connected, also be used for being connected with described medium between the described terminal and described current MSC is connected with medium between the described far-end according to the described current MSC of described session association associating information.
14. system as claimed in claim 12 is characterized in that: the connection of described MSC is set up module and also is used for after the message of receiving the described message that connects of refusal that described terminal sends, and retry is transmitted the described message that connects.
15. system as claimed in claim 12 is characterized in that: the connection of described MSC is set up module after notice is finished in the switching that receives the transmission of objective network controlled entity, transmits the described message that connects to described terminal again.
16. system as claimed in claim 15 is characterized in that: described system also comprises the objective network controlled entity; The switching controls module of described MSC also is used for sending switching notice to described objective network controlled entity after the handoff request of receiving from the CS territory; Described objective network controlled entity is used to receive described switching notice, also is used for after the described terminal of perception inserts objective network or receives that switching that described terminal sends finishes the indication back and send to switch to described MSC and finish notice.
17. system as claimed in claim 11, it is characterized in that: described system also comprises SC AS, described SC AS comprises connecting and sets up control module, is used to receive described transfer request, and sends the message that connects to described terminal after receiving described transfer request.
18. system as claimed in claim 17 is characterized in that: the connection of described SC AS is set up control module and also is used for after the message of receiving the described message that connects of refusal that described terminal sends, and retry is transmitted the described message that connects.
19. as claim 12 or 17 described systems, it is characterized in that: control module is set up in the connection of described SC AS, receive described transfer request after, also be used for using the media resource information M1 of described transfer request to upgrade described far-end; After receiving the message of carrying media resource information M2 of described far-end, described media resource information M2 is sent by the described message that connects; The connection of described terminal is set up control module and also is used to receive the described message that connects, and after receiving the described message that connects, the message of the media resource information M3 of described terminal is carried in transmission, and described media resource information M3 is contained among the described media resource information M1.
20. system as claimed in claim 11, it is characterized in that: the connection of described terminal is set up control module and is initiated the mode of the medium connection building process between described terminal and the far-end and be: initiate medium by described transfer request and be connected foundation, or, send second transfer request of carrying media resource information at objective network and initiate medium connection foundation; Described system also comprises SC AS, described SC AS also comprises connecting and sets up module, be used to receive described transfer request or described second transfer request, and the response message that after receiving described transfer request or described second transfer request, sends the media resource information of carrying far-end to described terminal.
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| CN2010101592817A CN102238673A (en) | 2010-04-26 | 2010-04-26 | Reverse single-standby service continuity realization method and system |
| PCT/CN2011/072470 WO2011134341A1 (en) | 2010-04-26 | 2011-04-06 | Method and system for realizing reverse single radio voice call continuity |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103200149A (en) * | 2012-01-04 | 2013-07-10 | 中兴通讯股份有限公司 | Reverse-direction one-standby service continuity implementation method and device |
| CN104936262A (en) * | 2014-03-21 | 2015-09-23 | 中兴通讯股份有限公司 | Sending and receiving method of far-end identification, device thereof and transmission system |
| WO2015139414A1 (en) * | 2014-03-21 | 2015-09-24 | 中兴通讯股份有限公司 | Method, device, and transmission system for transmitting and receiving remote identification |
| CN104936262B (en) * | 2014-03-21 | 2020-02-28 | 中兴通讯股份有限公司 | Method and device for sending and receiving far-end identification and transmission system |
| CN108541031A (en) * | 2017-03-03 | 2018-09-14 | 华为技术有限公司 | Business switch method, apparatus and system |
| CN108541031B (en) * | 2017-03-03 | 2020-07-21 | 华为技术有限公司 | Service switching method, device and system |
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