CN102577510B - Method and device for maintaining call continuity - Google Patents

Method and device for maintaining call continuity Download PDF

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Publication number
CN102577510B
CN102577510B CN201180003659.7A CN201180003659A CN102577510B CN 102577510 B CN102577510 B CN 102577510B CN 201180003659 A CN201180003659 A CN 201180003659A CN 102577510 B CN102577510 B CN 102577510B
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session
message
media path
ims
ims session
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CN102577510A (en
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周敬华
张朝辉
黄锴
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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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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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Embodiments of the present invention relates to a method and a device for maintaining call continuity. The method comprises: receiving a first Internet protocol multimedia subsystem (IMS) session switching message sent by a access switching entity, the first IMS session switching message being used for indicating a first session is replaced by a second session during a switching process of single radio voice call continuity (SRVCC), and the first IMS session switching message carrying a session identifier of the first session; searching for the first session according to the session identifier of the first session and acquiring a session description protocol (SDP) message corresponding to a remote media path of the first session; sending a second IMS session switching message to a service centralization and continuity application server (SCCAS), the second IMS session switching message carrying a SDP message corresponding to the remote media path of the first session. In the embodiments of the invention, the continuity of maintaining user calls during the SRVCC process is realized.

Description

Keep calling out continuous method and apparatus
Technical field
The embodiment of the present invention relates to communication technical field, particularly a kind ofly keeps calling out continuous method and apparatus.
Background technology
Long Term Evolution (Long Term Evolution, LTE) speech (the Voice over LTE of carrying, VoLTE) be a kind of use internet protocol multi-media sub-system (IP Multimedia Sub system, IMS) network provides the technology of human communication on the wireless access of the pattern of full grouping, along with data business volume progressively surmounts the main flow that speech becomes customer consumption, the application of the full grouping wireless network such as LTE is increasingly extensive.
Single wireless voice is called out (Single Radio Voice Call Continuity continuously, SRVCC) be that a kind of providing is switched to circuit switching (Circuit Switched by the voice service under VoLTE, CS) the lower technology that continues maintenance, user's voice service can needn't be re-established after crossing over out LTE border, promote user's experience.
In prior art, when user roams into access zone network and trigger SRVCC switching, in access side, carry out in media path handoff procedure, (for example: interconnected boundary Control function (Interconnection Border Control Function between carrier network, dispose borde gateway, IBCF) or transfer gateway (Transition Gateway, TrGW)) may revise Session Description Protocol (Session Description Protocol because carrying out IP address mapping, SDP) information, thereby trigger SCC AS and carry out the operation of upgrading distant end media path, the media break that may cause user to call out, affect user's normal voice service.
Summary of the invention
The embodiment of the present invention provides a kind of continuous method and apparatus that keeps calling out, to realize keep user to call out continuous in SRVCC process.
On the one hand, the embodiment of the present invention provides a kind of maintenance to call out continuous method, comprising:
Receive the first internet protocol multi-media sub-system IMS session switching message that access switching entity sends, a described IMS session switching message is used to indicate at single wireless voice calls out in continuous SRVCC handoff procedure and adopts the second session to replace the first session, and the session identification that carries described the first session in message is switched in a described IMS session;
According to the session identification of described the first session, search described the first session, and obtain the Session Description Protocol SDP information corresponding to distant end media path of described the first session;
To service set and continuous application server S CC AS, send the 2nd IMS session switching message, the SDP information corresponding to distant end media path of carrying described the first session in message is switched in described the 2nd IMS session.
The embodiment of the present invention also provides a kind of borde gateway, comprising:
Receiver, the the first internet protocol multi-media sub-system IMS session switching message sending for receiving access switching entity, a described IMS session switching message is used to indicate at single wireless voice calls out in continuous SRVCC handoff procedure and adopts the second session to replace the first session, and the session identification that carries described the first session in message is switched in a described IMS session;
Processor, for search described the first session according to the session identification of described the first session, and obtains the Session Description Protocol SDP information corresponding to distant end media path of described the first session;
Transmitter, for sending the 2nd IMS session switching message to service set and continuous application server S CC AS, the SDP information corresponding to distant end media path of carrying described the first session in message is switched in described the 2nd IMS session.
On the other hand, the embodiment of the present invention also provides a kind of maintenance to call out continuous method, comprising:
The single wireless voice that receives moving exchanging center MSC server or media gateway MGW transmission is called out continuous SRVCC handover request;
To described MSC server or MGW, return to SRVCC handoff response;
To borde gateway, send access and switch message, so that described borde gateway switches message by described access, be transmitted to service set and continuous application server S CC AS, described access is switched message and is used to indicate the distant end media path that keeps the first session in SRVCC handoff procedure.
The embodiment of the present invention also provides a kind of access switching entity, comprising:
Receiver, calls out continuous SRVCC handover request for receiving single wireless voice of moving exchanging center MSC server or media gateway MGW transmission;
Transmitter, for returning to SRVCC handoff response to described MSC server or MGW; Also for sending access to borde gateway, switch message, so that described borde gateway switches message by described access, be transmitted to service set and continuous application server S CC AS, described access is switched message and is used to indicate the distant end media path that keeps the first session in SRVCC handoff procedure.
Another aspect, the embodiment of the present invention also provides a kind of maintenance to call out continuous method, comprising:
The single wireless voice that receives moving exchanging center MSC server or media gateway MGW transmission is called out continuous SRVCC handover request;
To described MSC server or MGW, return to SRVCC handoff response;
Reach after setting-up time, to service set and continuous application server S CC AS, send internet protocol multi-media sub-system IMS session handover request, described IMS session is switched message for adopting the second session to replace the first session at SRVCC handoff procedure, the SDP information corresponding to access side media path of carrying described the second session in message is switched in described IMS session, so that described SCC AS is after access side media path upgrades, according to the distant end media path of the second session described in SDP information updating corresponding to the access side media path of described the second session.
The embodiment of the present invention also provides a kind of access switching entity, comprising:
Receiver, calls out continuous SRVCC handover request for receiving single wireless voice of moving exchanging center MSC server or media gateway MGW transmission;
Transmitter, for returning to SRVCC handoff response to described MSC server or MGW, also for reaching after setting-up time, to service set and continuous application server S CC AS, send internet protocol multi-media sub-system IMS session handover request, described IMS session switching message is used to indicate and in SRVCC handoff procedure, adopts the second session to replace the first session, the SDP information corresponding to access side media path of carrying described the second session in message is switched in described IMS session, so that described SCC AS is after access side media path upgrades, according to the distant end media path of the second session described in SDP information updating corresponding to the access side media path of described the second session.
Continuous method and apparatus is called out in the maintenance that the embodiment of the present invention provides, by borde gateway, according to former session identification, obtain SDP corresponding to distant end media path corresponding to former session on the one hand, and this SDP information is carried to IMS session switches message and send to SCC AS, to avoid SCC AS to upgrade distant end media path when access side media path upgrades, thereby realize keep user to call out continuous in SRVCC process; In SRVCC process, keep the distant end media path of former session on the one hand, thereby avoid SCC AS to upgrade distant end media path when access side media path upgrades, thereby realize keep user to call out continuous in SRVCC process; On the other hand, by accessing switching entity, postpone to switch message to borde gateway transmission IMS session, so that SCC AS renewal distant end media path after accessing the renewal of side media path, thereby realize keep user to call out continuous in SRVCC process.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the flow chart that an embodiment of continuous method is called out in maintenance provided by the invention;
Fig. 2 is the flow chart that continuous another embodiment of method is called out in maintenance provided by the invention;
Fig. 3 is the flow chart that continuous another embodiment of method is called out in maintenance provided by the invention;
Fig. 4 is the flow chart that an embodiment of continuous method is called out in maintenance provided by the invention;
Fig. 5 is the flow chart that continuous another embodiment of method is called out in maintenance provided by the invention;
Fig. 6 is the flow chart that continuous another embodiment of method is called out in maintenance provided by the invention;
Fig. 7 is the flow chart that an embodiment of continuous method is called out in maintenance provided by the invention;
Fig. 8 is the flow chart that continuous another embodiment of method is called out in maintenance provided by the invention;
Fig. 9 is the structural representation of an embodiment of borde gateway provided by the invention;
Figure 10 is the structural representation of service set provided by the invention and an embodiment of continuous application server;
Figure 11 is the structural representation of an embodiment of access switching entity provided by the invention;
Figure 12 is the structural representation of service set provided by the invention and another embodiment of continuous application server;
Figure 13 is the structural representation of another embodiment of access switching entity provided by the invention;
Figure 14 is the structural representation of another embodiment of access switching entity provided by the invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
Fig. 1 is the flow chart that an embodiment of continuous method is called out in maintenance provided by the invention, and as shown in Figure 1, the method comprises:
Message is switched in the first internet protocol multi-media sub-system IMS session that S101, reception access switching entity send, the one IMS session is switched message and is adopted the second session to replace the first session for calling out continuous SRVCC handoff procedure at single wireless voice, and the session identification that carries the first session in message is switched in an IMS session;
S102, according to the session identification of the first session, search the first session, and obtain the Session Description Protocol SDP information corresponding to distant end media path of the first session;
S103, send the 2nd IMS session switch message to service set and continuous application server S CC AS, the SDP information corresponding to distant end media path of carrying the first session in message is switched in the 2nd IMS session.
The executive agent of above step is the borde gateway of the IMS network under calling party and callee, such as: IBCF/TrGW etc.Wherein, borde gateway can also be to possess ALG (Application Level Gateway, ALG) entity of function, for example: the entities such as Proxy Call Session Control Function (Proxy Call Session Control Function, P-CSCF).
Access switching entity comprises access switching gateway (Access Transfer Gateway, ATGW) and controls the access switching control function (Access Transfer Control Function, ATCF) of ATGW.
When calling party sends call to callee, invite, both sides complete after call setup, and media path is divided into packet switching (Packet Switch, PS) access path and distant end media path two parts by ATGW.When calling out, there is SRVCC switching, (the Mobile Switching Center of mobile switching centre, MSC) server (Server) or media gateway (Media Gateway, MGW) first to ATCF/ATGW, initiate the media path switching of access side, ATCF/ATGW is after the media path of MSC server or MGW response access side is cut, and the media path of access side switches to CS access path from PS access path.
After access side has completed the foundation of CS access path, ATCF/ATGW sends an IMS session to IBCF/TrGW and switches message.Wherein, the first session be calling party and callee between the former session of setting up.The session identification that carries the first session in message is switched in the one IMS session.
IBCF/TrGW receives an IMS session and switches after message, and the session identification of the first session that can carry according to an IMS session switching message finds the first session, and then obtains the SDP information corresponding to distant end media path of this first session.
IBCF/TrGW can be carried at SDP information corresponding to the distant end media path of this first session in the one IMS session switching message and send to service set and continuous application server (Service Centralization and Continuity Application Server, the one IMS session of SCC AS), carrying SDP information corresponding to the distant end media path of the first session is switched message and is called the 2nd IMS session and switches message.Wherein, IBCF/TrGW sends the 2nd IMS session to SCC AS and switches message and be used to indicate SCC AS and in SRVCC process, adopt the second session to replace the first session.
SCC AS receives after the 2nd IMS session switching message of IBCF/TrGW transmission, can switch SDP information corresponding to distant end media path of obtaining the first session message from the 2nd IMS session, because the original session between calling party and callee (the first session) is by the process of the second session replacement, SDP information corresponding to distant end media path does not change, therefore, SCC AS is without upgrading distant end media path, and then avoided upgrading distant end media path and the SRVCC handoff that causes, kept that in SRVCC process, user calls out continuously.
Continuous method is called out in the maintenance that the present embodiment provides, borde gateway obtains SDP corresponding to distant end media path corresponding to former session according to former session identification, and this SDP information is carried to IMS session switches message and send to SCC AS, to avoid SCC AS to upgrade distant end media path when access side media path upgrades, thereby realize keep user to call out continuous in SRVCC process.
Fig. 2 is the flow chart that continuous another embodiment of method is called out in maintenance provided by the invention, and as shown in Figure 2, the method comprises:
Message is switched in S201, reception the second internet protocol multi-media sub-system IMS session, described the 2nd IMS session is switched message and is adopted the second session to replace the first session for calling out continuous SRVCC handoff procedure at single wireless voice, and the SDP information corresponding to distant end media path of carrying described the first session in message is switched in described the 2nd IMS session;
S202, the SDP information corresponding according to the distant end media path of described the first session are the distant end media path of described the first session by the distant end media Route maintenance of described the second session.
The executive agent of above step is SCC AS.
If SCC AS and borde gateway (such as: IBCF/TrGW etc.), also comprise inquiry CSCF (Interrogating CSCF, I-CSCF) or serving CSCF (Serving CSCF, S-CSCF), borde gateway can send to SCC AS by the 2nd IMS session switching message by I/S-CSCF; If SCC AS is directly connected with borde gateway, borde gateway can directly send the 2nd IMS session switching message to SCC AS.
SCC AS receives the 2nd IMS session and switches after message, the 2nd IMS session being switched to the SDP information SDP information corresponding with the distant end media path of first session (former session) of SCC AS preservation of carrying in message compares, in the embodiment of the present invention, it is the SDP information corresponding to distant end media path of the first session that SCC AS receives the SDP information of carrying in the 2nd IMS session switching message, , in the process that original session between calling party and callee (the first session) is replaced by the second session, SDP information corresponding to distant end media path does not change, therefore, SCC AS is without upgrading distant end media path, and then avoided upgrading distant end media path and the SRVCC handoff that causes, kept that user in SRVCC process calls out continuously.
Continuous method is called out in the maintenance that the present embodiment provides, borde gateway obtains the SDP information corresponding to distant end media path of former session according to former session identification, and this SDP information is carried to IMS session switches message and send to SCC AS, SCC AS receives this IMS session and switches after message, this IMS session is switched to the SDP information SDP information corresponding with the distant end media path of former session of carrying in message to be compared, comparative result is identical, SCC AS is without upgrading distant end media path, thereby avoid SCC AS when access side media path upgrades, to upgrade distant end media path, realization in SRVCC process, keep that user calls out continuously.
Fig. 1 and embodiment illustrated in fig. 2 respectively from borde gateway side (such as: IBCF/TrGW etc.) and SCC AS side maintenance provided by the invention called out to continuous method describe, below the full implementation scene of process that the embodiment calling party who provides Fig. 1 and Fig. 2 to provide and callee's former session establishment process and SRVCC are switched.As shown in Figure 3, in this embodiment, calling party represents with UE1, and callee represents with UE2, and this embodiment specifically comprises the following steps:
S301, ATCF/ATGW receive UE1 and send call invitation message (INVITE).
S302, ATCF judgement will be carried out media path grappling, ATCF can process the media resource distributing in ATGW, generate the SDP information (SDP1) corresponding to access side media path of the first session, and this SDP1 is carried in call invitation message and sends to IBCF/TrGW.
Wherein, ATCF can adopt existing method to process the media resource distributing in ATGW, generates the SDP corresponding to access side media path of the first session, and this first session is the former session that SRVCC sets up before switching occurs between UE1 and UE2.In the present embodiment, the SDP corresponding to access side media path of the first session can represent with SDP1.ATCF sends to the call invitation message of IBCF/TrGW to be the first call invitation message.
S303, IBCF/TrGW receive after the first call invitation message, and judgement need to be carried out the conversion of transport address, the SDP1 in the first call invitation message are revised as to the SDP information (SDP2) corresponding to distant end media path of the first session.
It should be noted that, if calling party and callee are in the IMS of different operators network, the call invitation message that calling party sends arrives after callee's IMS network, IBCF/TrGW need to carry out the conversion of transport address, specifically carry out the conversion of different IP addresses, port or version etc., and the conversion of transport address normally completes by revising corresponding media parameter in SDP information.In the present embodiment, SDP corresponding to the distant end media path of amended the first session can represent with SDP2.
S304, IBCF/TrGW are carried at SDP2 in call invitation message and send to I/S-CSCF.
If comprise I/S-CSCF between SCC AS and borde gateway, carry out S304; If SCC AS is directly connected with borde gateway, borde gateway can directly send to SCC AS by call invitation message.IBCF/TrGW sends to the call invitation message of I/S-CSCF to be the second call invitation message.
S305, the I/S-CSCF invitation message (carrying the first session identification #1) of conversing sends to SCC AS, and SCC AS preserves SDP2 and other session related information of receiving.
S306, SCC AS return to the response message of call invitation message.
S307, the I/S-CSCF invitation message (carrying the first session identification #1) of conversing sends to UE2.
S308, each entity carry out subsequent voice calls interaction flow, complete call setup, and media path is divided into PS access path and distant end media path two parts by ATGW.
Wherein, in distant end media path, may connect a plurality of borde gateways.
There is SRVCC switching in S309, calling, MSC server/MGW sends SRVCC handover request to ATCF/ATGW.
S310, ATCF/ATGW return to SRVCC handoff response to MSC server/MGW, set up circuit switching (CS) territory media path with MSC server/MGW.
S311, ATCF/ATGW send IMS session to IBCF/TrGW and switch message, this IMS session switching message is used to indicate and in SRVCC handoff procedure, adopts the second session to replace the first session, wherein, IMS session switch in message, carry the session identification of the first session.ATCF/ATGW sends IMS session switching message to IBCF/TrGW and is the first session switching message.
S312, IBCF/TrGW receive after this IMS session switching message, search the first session, and obtain the Session Description Protocol SDP information (SDP2) corresponding to distant end media path of the first session according to the session identification of the first session.
SDP information (SDP3) corresponding to access side media path that S313, IBCF/TrGW adopt SDP information (SDP2) corresponding to the distant end media path of the first session to replace the second session is carried in IMS session switching message and sends to I/S-CSCF.
IBCF/TrGW sends to the IMS session of I/S-CSCF to switch message and is the 2nd IMS session switching message.
S314, I/S-CSCF switch the IMS session of carrying SDP2 in message and send to SCC AS.
It is also that message is switched in the 2nd IMS session that I/S-CSCF sends to the IMS session of SCC AS to switch message.
The SDP information that S315, SCC AS are corresponding according to the distant end media path of the first session is the distant end media path of the first session by the distant end media Route maintenance of the second session.
SCC AS receives this IMS session and switches after message, this IMS session being switched to SDP information (SDP2) the SDP information (SDP2) corresponding with the distant end media path of first session (former session) of SCC AS preservation of carrying in message compares, in the embodiment of the present invention, it is the SDP information corresponding to distant end media path of the first session that SCC AS receives the SDP information of carrying in IMS session switching message, therefore, SCC AS is without upgrading distant end media path, and then avoided upgrading distant end media path and the SRVCC handoff that causes, kept that user in SRVCC process calls out continuously.
It should be noted that, in the present embodiment, take calling procedure as example is to keeping the continuous method of calling to describe, and wherein omitted part entity.And in fact, maintenance provided by the invention is called out continuous method and is applicable to too called flow, in calling party and callee's call path, also can exist several can carry out the borde gateway of address transition.
Continuous embodiment of the method is called out in the above-mentioned maintenance providing, by borde gateway, according to former session identification, obtain SDP corresponding to distant end media path corresponding to former session, and this SDP information is carried to IMS session switches message and send to SCC AS, to avoid SCC AS to upgrade distant end media path when access side media path upgrades, thereby realize keep user to call out continuous in SRVCC process.
The present invention also provides and has kept calling out the continuous feasible embodiment of another kind, specifically can in SRVCC process, keep the distant end media path of former session, thereby avoid SCC AS to upgrade distant end media path when access side media path upgrades, thereby realize keep user to call out continuous in SRVCC process.Shown in Fig. 4, specifically comprise:
Single wireless voice that S401, reception moving exchanging center MSC server or media gateway MGW send is called out continuous SRVCC handover request;
S402, to MSC server or MGW, return to SRVCC handoff response;
S403, to borde gateway, send access and switch message, so that borde gateway switches message by access, be transmitted to service set and continuous application server S CC AS, access is switched message and is used to indicate the distant end media path that keeps the first session in SRVCC handoff procedure.
The executive agent of above step, for access switching entity, is specifically as follows ATCF or ATGW.Borde gateway can be IBCF/TrGW etc.
When calling party sends call to callee, invite, both sides complete after call setup, and media path is divided into PS access path and distant end media path two parts by ATGW.When calling out, there is SRVCC switching, first MSC server (Server) or MGW initiate the media path switching of access side to ATCF/ATGW, ATCF/ATGW is after the media path of MSC server or MGW response access side is cut, and the media path of access side switches to CS access path from PS access path.
In access side, completed after CS access path sets up, ATCF/ATGW sends access to borde gateway and switches message, and this access switching message is used to indicate and in SRVCC handoff procedure, keeps the first session.
Borde gateway receives this access and switches after message, can this access be switched to message by I/S-CSCF and be transmitted to SCC AS, or directly this access switching message is transmitted to SCC AS.
In the embodiment of the present invention, session between calling party and callee is not rebuild in SRVCC handoff procedure, therefore, SDP information corresponding to distant end media path does not change, avoided SCC AS to upgrade distant end media path, and then avoided upgrading distant end media path and the SRVCC handoff that causes, kept that in SRVCC process, user calls out continuously.
Continuous method is called out in the maintenance that the present embodiment provides, and keeps former session in SRVCC process, thereby avoids SCC AS to upgrade distant end media path when access side media path upgrades, thereby realizes keep user to call out in SRVCC process continuous.
Fig. 5 is the flow chart that continuous another embodiment of method is called out in maintenance provided by the invention, and as shown in Figure 5, the method comprises:
Message is switched in S501, reception access, and access switching message is used to indicate at single wireless voice calls out the distant end media path that keeps the first session in continuous SRVCC handoff procedure;
S502, according to access, switch message, the first session is switched to circuit switching (CS) territory from packet switching PS territory.
The executive agent of above embodiment is SCC AS.
If SCC AS and borde gateway (such as: IBCF/TrGW etc.), also comprise I-S/CSCF, borde gateway can send to SCC AS by access switching message by I/S-CSCF; If SCC AS is directly connected with borde gateway, borde gateway can directly send access switching message to SCC AS.
SCC AS receives this access and switches after message, and because the distant end media path that message indication keeps the first session in SRVCC handoff procedure is switched in this access, therefore, SCC AS can be switched to CS territory from PS territory by the first session.
In the embodiment of the present invention, between calling party and callee, in SRVCC handoff procedure, session is not rebuild, therefore, SDP information corresponding to distant end media path does not change, avoided SCC AS to upgrade distant end media path, and then avoided upgrading distant end media path and the SRVCC handoff that causes, kept that in SRVCC process, user calls out continuously.
Continuous method is called out in the maintenance that the present embodiment provides, and keeps former session in SRVCC process, thereby avoids SCC AS to upgrade distant end media path when access side media path upgrades, thereby realizes keep user to call out in SRVCC process continuous.
Fig. 4 and embodiment illustrated in fig. 5ly from access switching entity (ATCF/ATGW) side and SCC AS side, maintenance provided by the invention is called out to continuous method respectively and describe, below the full implementation scene of process that the embodiment calling party who provides Fig. 4 and Fig. 5 to provide and callee's former session establishment process and SRVCC are switched.As shown in Figure 6, in this embodiment, calling party represents with UE1, and callee represents with UE2, and this embodiment specifically comprises the following steps:
S601, ATCF/ATGW receive UE1 and send call invitation message (INVITE).
S602, ATCF judgement will be carried out media path grappling, ATCF can process the media resource distributing in ATGW, generate the SDP information (SDP1) corresponding to access side media path of the first session, and this SDP1 is carried in call invitation message and sends to IBCF/TrGW.In S602, ATCF sends to the session identification that carries the first session in the call invitation message of IBCF/TrGW, and in the present embodiment, the session identification of this first session represents with SIP INFO#1.
S603, IBCF/TrGW receive after call invitation message, and judgement need to be carried out the conversion of transport address, the SDP1 in call invitation message are revised as to the SDP information (SDP2) corresponding to distant end media path of the first session.
S604, IBCF/TrGW are carried at SDP2 in call invitation message and send to I/S-CSCF.
S605, I/S-CSCF send to SCC AS by call invitation message, and SCC AS preserves SDP information and other session related information of receiving.
S606, SCC AS return to the response message of call invitation message.
S607, I/S-CSCF send to UE2 by call invitation message.
S608, each entity carry out subsequent voice calls interaction flow, complete call setup, and media path is divided into PS access path and distant end media path two parts by ATGW.
There is SRVCC switching in S609, calling, MSC server/MGW sends SRVCC handover request to ATCF/ATGW.
S610, ATCF/ATGW return to SRVCC handoff response to MSC server/MGW, set up circuit switching (CS) territory media path with MSC server/MGW.
Detailed process and the S301-S310 of above-mentioned S601-S610 are similar, specifically can, referring to the associated description in S301-S310, not repeat them here.
S611, ATCF/ATGW send access to IBCF/TrGW and switch message, and this access is switched message and is used to indicate the distant end media path that keeps the first session in SRVCC handoff procedure.
It should be noted that, at some, implement under scene, between UE1 and UE2, can there are a plurality of sessions, in this case, access is switched in message can also further carry session identification, because sending access to IBCF/TrGW, ATCF/ATGW switches the distant end media path that message indication keeps the first session in SRVCC handoff procedure, therefore, it is still the session identification SIP INFO#1 of the first session that the session identification carrying in message is switched in this access, to indicate which or which session that need to keep between UE1 and UE2 in SRVCC handoff procedure.
S612, IBCF/TrGW switch message by described access and are transmitted to I/S-CSCF.
S613, I/S-CSCF switch message by this access and are transmitted to SCC AS.
S614, SCC AS switch message according to access, complete follow-up handoff procedure in session, and the first session is switched to CS territory from PS territory.
In the embodiment of the present invention, between calling party and callee, in SRVCC handoff procedure, session is not rebuild, therefore, SDP information corresponding to distant end media path does not change, avoided SCC AS to upgrade distant end media path, and then avoided upgrading distant end media path and the SRVCC handoff that causes, kept that in SRVCC process, user calls out continuously.
Continuous embodiment of the method is called out in the maintenance that Fig. 4-Fig. 6 provides, by keep former session in SRVCC process, thereby avoid SCC AS to upgrade distant end media path when access side media path upgrades, thereby realize keep user to call out continuous in SRVCC process.The present invention also provides and has kept calling out the continuous feasible embodiment of another kind, specifically can postpone to send IMS session to borde gateway by access switching entity (ATCF/ATGW) and switch message, so that SCC AS upgrades distant end media path after accessing the renewal of side media path, thereby realize keep user to call out continuous in SRVCC process.As shown in Figure 7, specifically comprise:
Single wireless voice that S701, reception moving exchanging center MSC server or MGW send is called out continuous SRVCC handover request;
S702, to MSC server or MGW, return to SRVCC handoff response;
S703, reach after setting-up time, to SCC AS, send internet protocol multi-media sub-system IMS session handover request, IMS session is switched message for adopting the second session to replace the first session at SRVCC handoff procedure, in IMS session handover request, carry the SDP information corresponding to access side media path of the second session, so that SCC AS is after access side media path upgrades, according to the distant end media path of SDP information updating the second session corresponding to the access side media path of the second session.
The executive agent of above step, for access switching entity, is specifically as follows ATCF or ATGW.Borde gateway can be IBCF/TrGW etc.
When calling party sends call to callee, invite, both sides complete after call setup, and media path is divided into PS access path and distant end media path two parts by ATGW.When calling out, there is SRVCC switching, first MSC server (Server) or MGW initiate the media path switching of access side to ATCF/ATGW, ATCF/ATGW is after the media path of MSC server or MGW response access side is cut, and the media path of access side switches to CS access path from PS access path.
After access side has completed the foundation of CS access path, ATCF/ATGW can postpone after setting-up time, to SCC AS, send IMS session handover request again, thereby so that SCC AS can be after access side media path upgrades, then according to the distant end media path of SDP information updating the second session corresponding to the access side media path of the second session.Thereby realize keep user to call out continuous in SRVCC process.
Wherein, the setting-up time that access switching entity (ATCF/ATGW) postpones can be determined according to the required time of handoff procedure of access side media path, such as being set to 5 seconds, also can adjust as required.
IMS session switching message can be used to indicate and in SRVCC handoff procedure, adopt the second session to replace the first session, in IMS session handover request, can carry the SDP information corresponding to access side media path of the second session, that is to say, after reaching setting-up time, the process that ATCF/ATGW sends IMS session handover request to SCC AS can adopt existing process, and in this not go into detail.
Continuous method is called out in the maintenance that the present embodiment provides, by access switching entity, postpone to send IMS session to borde gateway and switch message, so that SCC AS upgrades distant end media path after accessing the renewal of side media path, thereby realize keep user to call out continuous in SRVCC process.
Embodiment illustrated in fig. 7ly from access switching entity, maintenance provided by the invention called out to continuous method describe, below the full implementation scene of process that the embodiment calling party who provides Fig. 7 to provide and callee's former session establishment process and SRVCC are switched.As shown in Figure 8, in this embodiment, calling party represents with UE1, and callee represents with UE2, and this embodiment specifically comprises the following steps:
S801, ATCF/ATGW receive UE1 and send call invitation message (INVITE).
S802, ATCF judgement will be carried out media path grappling, ATCF can process the media resource distributing in ATGW, generate the SDP information (SDP1) corresponding to access side media path of the first session, and this SDP1 is carried in call invitation message and sends to IBCF/TrGW.
S803, IBCF/TrGW receive after call invitation message, and judgement need to be carried out the conversion of transport address, the SDP1 in call invitation message are revised as to the SDP information (SDP2) corresponding to distant end media path of the first session.
S804, IBCF/TrGW are carried at SDP2 in call invitation message and send to I/S-CSCF.
S805, I/S-CSCF send to SCC AS by call invitation message, and SCC AS preserves SDP2 and other session related information of receiving.
S806, SCC AS return to the response message of call invitation message.
S807, I/S-CSCF send to UE2 by call invitation message.
S808, each entity carry out subsequent voice calls interaction flow, complete call setup, and media path is divided into PS access path and distant end media path two parts by ATGW.
There is SRVCC switching in S809, calling, MSC server/MGW sends SRVCC handover request to ATCF/ATGW.
S810, ATCF/ATGW return to SRVCC handoff response to MSC server/MGW, set up circuit switching (CS) territory media path with MSC server/MGW.
Detailed process and the S301-S310 of above-mentioned S801-S810 are similar, specifically can, referring to the associated description in S301-S310, not repeat them here.
S811, ATCF/ATGW start timer, send IMS session switch after timer expiry to IBCF/TrGW.
S812, IBCF/TrGW switch IMS session to send to I/S-CSCF.
S813, I/S-CSCF switch IMS session to send to SCC AS.
The SDP information corresponding to distant end media path of the first session (former session) that the SDP information that S814, SCC AS carry during the IMS session receiving is switched is preserved with SCC AS compares.As different in comparative result, SCC AS initiates to upgrade far-end connection media path.
Wherein, the process of S812-S814 and the implementation of prior art are similar, at this, no longer launch to describe.
Because upgrading distant end media path, SCC AS carries out after access side media path upgrades, therefore avoided access side media path and distant end media path to upgrade the media break that media path causes simultaneously, realized keep user to call out continuous in SRVCC process.
One of ordinary skill in the art will appreciate that: all or part of step that realizes said method embodiment can complete by the relevant hardware of program command, aforesaid program can be stored in a computer read/write memory medium, this program, when carrying out, is carried out the step that comprises said method embodiment; And aforesaid storage medium comprises: various media that can be program code stored such as ROM, RAM, magnetic disc or CDs.
Fig. 9 is the structural representation of an embodiment of borde gateway provided by the invention, and as shown in Figure 9, this borde gateway comprises: receiver 11, processor 12 and transmitter 13; Wherein:
Receiver 11, the the first internet protocol multi-media sub-system IMS session switching message sending for receiving access switching entity, the one IMS session switching message is used to indicate at single wireless voice calls out in continuous SRVCC handoff procedure and adopts the second session to replace the first session, and the session identification that carries the first session in message is switched in an IMS session;
Processor 12, for searching the first session according to the session identification of the first session, and obtains the Session Description Protocol SDP information corresponding to distant end media path of the first session;
Transmitter 13, for sending the 2nd IMS session switching message to service set and continuous application server S CC AS, the SDP information corresponding to distant end media path of carrying the first session in message is switched in the 2nd IMS session.
As a kind of feasible execution mode, receiver 11 can also be for: receive the first call message request that access switching entity sends, carry the SDP information corresponding to access side media path of the first session in the first call message request.
Further, transmitter 13 can also be for: to SCC AS, send the second call message request, carry the SDP information corresponding to distant end media path of the first session in the second call message request.
Wherein, SDP information corresponding to access side media path that can also carry the second session in message is switched in the IMS session that the access switching entity that receiver 11 receives sends; Corresponding, processor 12 can also be for: after SDP information corresponding to distant end media path that an IMS session is switched to the second session that message carries adopts the SDP information corresponding to access side media path of described the first session to replace, an IMS session is switched to message and as the 2nd IMS session, switch message.
As a kind of feasible execution mode, transmitter 13 can be specifically for: to inquiry/service call conversation control function I/S-CSCF, send the 2nd IMS session and switch message, so that I/S-CSCF switches message by the 2nd IMS session, be transmitted to SCC AS.
The borde gateway that the embodiment of the present invention provides, for the actuating equipment of continuous method is called out in maintenance provided by the invention, it is carried out and keeps the detailed process of calling out continuous method referring to the embodiment of the method shown in Fig. 1-Fig. 3, not repeat them here.
The borde gateway that the present embodiment provides, according to former session identification, obtain SDP corresponding to distant end media path corresponding to former session, and this SDP information is carried to IMS session switches message and send to SCC AS, to avoid SCC AS to upgrade distant end media path when access side media path upgrades, thereby realize keep user to call out continuous in SRVCC process.
Figure 10 is the structural representation of service set provided by the invention and an embodiment of continuous application server, and as shown in figure 10, this SCC AS comprises: receiver 21 and processor 22; Wherein:
Receiver 21, be used for receiving the second internet protocol multi-media sub-system IMS session and switch message, the 2nd IMS session switching message is used to indicate at single wireless voice calls out in continuous SRVCC handoff procedure and adopts the second session to replace the first session, and the SDP information corresponding to distant end media path of carrying the first session in message is switched in the 2nd IMS session;
Processor 22, for the SDP information corresponding according to the distant end media path of the first session, is the distant end media path of the first session by the distant end media Route maintenance of the second session.
The SCC AS that the embodiment of the present invention provides, for the actuating equipment of continuous method is called out in maintenance provided by the invention, it is carried out and keeps the detailed process of calling out continuous method referring to the embodiment of the method shown in Fig. 1-Fig. 3, not repeat them here.
The SCC AS that the present embodiment provides, borde gateway obtains the SDP information corresponding to distant end media path of former session according to former session identification, and this SDP information is carried to IMS session switches message and send to SCC AS, SCC AS receives this IMS session and switches after message, this IMS session is switched to the SDP information SDP information corresponding with the distant end media path of former session of carrying in message to be compared, comparative result is identical, SCC AS is without upgrading distant end media path, thereby avoid SCCAS when access side media path upgrades, to upgrade distant end media path, realization in SRVCC process, keep that user calls out continuously.
Figure 11 is the structural representation of an embodiment of access switching entity provided by the invention, and as shown in figure 11, this access switching entity comprises: receiver 31 and transmitter 32; Wherein:
Receiver 31, calls out continuous SRVCC handover request for receiving single wireless voice of moving exchanging center MSC server or media gateway MGW transmission;
Transmitter 32, for returning to SRVCC handoff response to MSC server or MGW; Also for sending access to borde gateway, switch message, so that borde gateway switches message by access, be transmitted to service set and continuous application server S CC AS, access is switched message and is used to indicate the distant end media path that keeps the first session in SRVCC handoff procedure.
The access switching entity that the embodiment of the present invention provides, can be specifically that ATCF/ATGW is the actuating equipment that continuous method is called out in maintenance provided by the invention, it is carried out and keeps the detailed process of calling out continuous method referring to the embodiment of the method shown in Fig. 4-Fig. 6, not repeat them here.
The access switching entity that the present embodiment provides indicates SCC AS to keep former session in SRVCC process, thereby avoids SCC AS to upgrade distant end media path when access side media path upgrades, thereby realizes keep user to call out in SRVCC process continuous.
Figure 12 is the structural representation of service set provided by the invention and another embodiment of continuous application server, and as shown in figure 12, this SCC AS can comprise: receiver 41 and processor 42; Wherein:
Receiver 41, switches message for receiving access, and access switching message is used to indicate at single wireless voice calls out the distant end media path that keeps the first session in continuous SRVCC handoff procedure;
Processor 42, for switching message according to access, is switched to circuit switching (CS) territory by the first session from packet switching PS territory.
The SCC AS that the embodiment of the present invention provides, for the actuating equipment of continuous method is called out in maintenance provided by the invention, it is carried out and keeps the detailed process of calling out continuous method referring to the embodiment of the method shown in Fig. 4-Fig. 6, not repeat them here.
The SCC AS that the present embodiment provides, in SRVCC process, according to the indication of access switching control function, keep former session, thereby avoid SCC AS to upgrade distant end media path when access side media path upgrades, thereby realize keep user to call out continuous in SRVCC process.
Figure 13 is the structural representation of another embodiment of access switching entity provided by the invention, and as shown in figure 13, this access switching control function comprises: receiver 51 and transmitter 52; Wherein:
Receiver 51, calls out continuous SRVCC handover request for receiving single wireless voice of moving exchanging center MSC server or media gateway MGW transmission;
Transmitter 52, for returning to SRVCC handoff response to MSC server or MGW; Also for reaching after setting-up time, to service set and continuous application server S CC AS, send internet protocol multi-media sub-system IMS session handover request, IMS session switching message is used to indicate and in SRVCC handoff procedure, adopts the second session to replace the first session, the SDP information corresponding to access side media path of carrying the second session in message is switched in IMS session, so that SCC AS is after access side media path upgrades, according to the distant end media path of SDP information updating the second session corresponding to the access side media path of the second session.
Figure 14 is the structural representation of another embodiment of access switching entity provided by the invention, and as shown in figure 14, this access switching entity can also comprise:
Timer 53 can start in time after returning to SRVCC handoff response at transmitter 52 to MSC server or MGW, and after reaching setting-up time, triggers transmitter and send internet protocol multi-media sub-system IMS session handover request to SCC AS.
The access switching entity that the embodiment of the present invention provides, can be specifically that ATCF/ATGW is the actuating equipment that continuous method is called out in maintenance provided by the invention, it is carried out and keeps the detailed process of calling out continuous method referring to the embodiment of the method shown in Fig. 7 and Fig. 8, not repeat them here.
The access switching entity that the present embodiment provides, switches message by postponing to send IMS session to borde gateway, so that SCC AS upgrades distant end media path after accessing the renewal of side media path, thereby realizes keep user to call out continuous in SRVCC process.
Finally it should be noted that: above embodiment only, in order to technical scheme of the present invention to be described, is not intended to limit; Although the present invention is had been described in detail with reference to previous embodiment, those of ordinary skill in the art is to be understood that: its technical scheme that still can record aforementioned each embodiment is modified, or part technical characterictic is wherein equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution depart from the spirit and scope of various embodiments of the present invention technical scheme.

Claims (12)

1. keep calling out a continuous method, it is characterized in that, comprising:
Receive the first internet protocol multi-media sub-system IMS session switching message that access switching entity sends, a described IMS session switching message is used to indicate at single wireless voice calls out in continuous SRVCC handoff procedure and adopts the second session to replace the first session, and the session identification that carries described the first session in message is switched in a described IMS session;
According to the session identification of described the first session, search described the first session, and obtain the Session Description Protocol SDP information corresponding to distant end media path of described the first session;
To service set and continuous application server S CC AS, send the 2nd IMS session switching message, the SDP information corresponding to distant end media path of carrying described the first session in message is switched in described the 2nd IMS session.
2. method according to claim 1, is characterized in that, the first internet protocol multi-media sub-system IMS session that described reception access switching entity sends also comprises before switching message:
Receive the first call message request that described access switching entity sends, in described the first call message request, carry the SDP information corresponding to access side media path of described the first session.
3. method according to claim 2, is characterized in that, the first internet protocol multi-media sub-system IMS session that described reception access switching entity sends also comprises before switching message:
To described SCC AS, send the second call message request, in described the second call message request, carry the SDP information corresponding to distant end media path of described the first session.
4. according to the method described in claim 1-3 any one, it is characterized in that, the SDP information corresponding to access side media path of also carrying the second session in message is switched in the described IMS session that described access switching entity sends;
Described before service set and continuous application server S CC AS transmission the 2nd IMS session switching message, also comprise:
SDP information corresponding to distant end media path that a described IMS session is switched to described second session of carrying in message is switched message using a described IMS session and is switched message as described the 2nd IMS session after adopting SDP information corresponding to the distant end media path of described the first session to replace.
5. method according to claim 4, is characterized in that, described to service set and continuous application server S CC AS transmission the 2nd IMS session switching message, is specially:
To inquiry/service call conversation control function I/S-CSCF, send described the 2nd IMS session and switch message, so that described I/S-CSCF switches message by described the 2nd IMS session, be transmitted to described SCCAS.
6. according to the method described in claim 1-3 any one, it is characterized in that, described to service set and continuous application server S CC AS transmission the 2nd IMS session switching message, be specially:
To inquiry/service call conversation control function I/S-CSCF, send described the 2nd IMS session and switch message, so that described I/S-CSCF switches message by described the 2nd IMS session, be transmitted to described SCCAS.
7. a borde gateway, is characterized in that, comprising:
Receiver, the the first internet protocol multi-media sub-system IMS session switching message sending for receiving access switching entity, a described IMS session switching message is used to indicate at single wireless voice calls out in continuous SRVCC handoff procedure and adopts the second session to replace the first session, and the session identification that carries described the first session in message is switched in a described IMS session;
Processor, for search described the first session according to the session identification of described the first session, and obtains the Session Description Protocol SDP information corresponding to distant end media path of described the first session;
Transmitter, for sending the 2nd IMS session switching message to service set and continuous application server S CC AS, the SDP information corresponding to distant end media path of carrying described the first session in message is switched in described the 2nd IMS session.
8. borde gateway according to claim 7, it is characterized in that, described receiver also for: receive the first call message request that described access switching entity sends, in described the first call message request, carry the SDP information corresponding to access side media path of described the first session.
9. borde gateway according to claim 8, is characterized in that, described transmitter also for: to described SCC AS, send the second call message request, in described the second call message request, carry the SDP information corresponding to distant end media path of described the first session.
10. according to the borde gateway described in claim 7-9 any one, it is characterized in that, the SDP information corresponding to access side media path of also carrying the second session in message is switched in the described IMS session that the described access switching entity that described receiver receives sends;
Described processor also for: after SDP information corresponding to distant end media path that a described IMS session is switched to described the second session that message carries adopts the SDP information corresponding to distant end media path of described the first session to replace, a described IMS session is switched to message as described the 2nd IMS session switching message.
11. borde gateways according to claim 10, it is characterized in that, described transmitter specifically for: to inquiry/service call conversation control function I/S-CSCF, send described the 2nd IMS session and switch message, so that described I/S-CSCF is transmitted to described SCC AS by described the 2nd IMS session switching message.
12. according to the borde gateway described in claim 7-9 any one, it is characterized in that, described transmitter specifically for: to inquiry/service call conversation control function I/S-CSCF, send described the 2nd IMS session and switch message, so that described I/S-CSCF is transmitted to described SCC AS by described the 2nd IMS session switching message.
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