CN101227647B - Switching method of keeping multimedia conversation continuity business - Google Patents
Switching method of keeping multimedia conversation continuity business Download PDFInfo
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- CN101227647B CN101227647B CN2008100081338A CN200810008133A CN101227647B CN 101227647 B CN101227647 B CN 101227647B CN 2008100081338 A CN2008100081338 A CN 2008100081338A CN 200810008133 A CN200810008133 A CN 200810008133A CN 101227647 B CN101227647 B CN 101227647B
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Abstract
The invention provides a switching process of a service which can guarantee the continuity of the multimedia conversation, which is applied on an IP multimedia sub-system, and comprises carrying the switching type information in a conversation request in a circuit domain when a user device initiates the switching after establishing the multimedia conversation in a packet switching domain with a far-end user, and switches the voice conversation in the multimedia conversation into the circuit domain, wherein the switching type information comprises the information whether the user device conducts the switching of the packet switching domain for the rest multimedia conversation, judging whether the user device initiates the conversation request of the packet switching domain by an MMSC application server according to the switching type information when the MMSC application server receives the conversation request of the circuit domain switching in advance, sending the conversation updating request to the far-end user after receiving all conversation requests if initiates, or directly sending the conversation updating request to the far-end user, and continuing the sequent switching process after sending the conversation updating request. The MMSC AS also can know whether waits the PS domain conversation request of the user if firstly receives the CS domain conversation request which is initiated by the user, thereby finishing the switching process fast and accurately, and increasing the system efficiency.
Description
Technical field
The present invention relates to the communications field, relate more specifically to keep in a kind of IMS system changing method of multimedia conversation continuity business.
Background technology
IP (network interconnection agreement; Internet Protocol is called for short IP) IP multimedia subsystem, IMS (IPMultimedia Core Network Subsystem is called for short IMS) is by third generation partner program (3rdGeneration Partnership Project; Abbreviation 3GPP) a kind of IP-based network framework that proposes; It has made up an opening and service environment flexibly, supports multimedia application, and abundant multimedia service is provided for the user.
IMS is based on the communication network framework of IP; Irrelevant with access technology; Except being GPRS (General Packet Radio Service; GPRS), WLAN packet access networks such as (Wireless LocalArea Network, WLANs) provides outside the business, can also be GSM (Global System for Mobile communications; Global system for mobile communications), UMTS mobile cellular networks such as (Universal Mobile Telecommunications System, unified mobile communcations systems) provides professional.
Mobile cellular network such as GSM, UMTS adopts circuit-switched technology, is called circuit (CircuitSwitched is called for short CS) territory, can basic speech business be provided for the user, and based on the supplementary service of speech business.When IMS was inserted in the CS territory, it developed into a kind of access way, and business provides by IMS is unified fully, and this technology is called IMS centralized traffic (IMS Centralized Service is called for short ICS).In the network; Realize that the professional network element of ICS can be IMS circuit domain control function (IMSCS Control Function; ICCF), also can be enhancement mode mobile switching centre (Mobile SwitchCenter, MSC); Because these network elements and essence of the present invention are irrelevant, so the unified ICS node that is called among the present invention.Subscriber equipment (User Equipment; UE) and the interface between the ICS node can be destructuring supplementary service data (Unstructured Supplementary Service Data is called for short USSD); Can be conversation initialized protocol (the Session Initial Protocol on the PS territory; Be called for short SIP), also can be traditional circuit domain interface.
The user need keep the continuity of Multimedia session under various access waies simultaneously.At this moment, the Multimedia session of user UE not only will keep continuity when switching between the packet-switched domain (Packet Switch is called for short PS), simultaneously in PS territory and CS territory, keep continuity in the switching in PS territory and PS territory+CS territory.Guarantee that this successional technology is called IMS multimedia conversation continuity (MultimediaSession Continuity is called for short MMSC).In the MMSC technology, if MMSC user UE inserts from the CS territory, then the access way in CS territory adopts the ICS technology, if promptly MMSC contracted user UE need be when CS inserts, it also must be the ICS contracted user.The Organization Chart of MMSC technology is as shown in Figure 1.This system comprises MMSC and ICS contracted user, ICS node, S-CSCF node, MMSC AS and remote subscriber; Wherein, when MMSC and ICS contracted user insert through the CS territory and the ICS node communication, when inserting through the PS territory and the S-CSCF node communication, ICS node and S-CSCF node all link to each other with MMSC AS, and MMSC AS communicates by letter with remote subscriber again.For simplicity, the network element that has nothing to do with the present invention on the access path all omits in the drawings.
In the MMSC technology, have such handoff scenario: user UE carries out Multimedia session at Access Network A, and this Access Network provides has the PS of VoIP ability territory (this moment, voice and other multi-medium datas were all in the PS territory); User UE because a variety of causes (as; Wireless signal variation, reasons such as charging) need switch to another Access Network B, this Access Network PS territory does not have the VoIP ability; Perhaps this Access Network has only the CS territory, and voice this moment must be in the CS territory.
The prior art switching flow is as shown in Figure 2: user UE-A and far-end are set up Multimedia session on PS1 territory (Access Network A).This moment, UE-A was because a variety of causes need switch to Access Network B, and wherein voice are in the CS territory, and remaining Multimedia session all switches to new PS territory, described for convenient, and the present invention is with this new PS territory of PS2 domain representation.
101) the UE-A decision begins to switch;
102) UE-A initiates the SIP conversation request in the PS2 territory; Wherein comprise the territory and switched sign (Domain Transfer URI; Abbreviation VDI), Multimedia session handover information; Point out that wherein voice conversation switches to the CS territory, this message sends to the service call conversation control function (Serving-Call Session Control Function is called for short S-CSCF) of user attaching; The Multimedia session handover information can comprise the information of describing handoff scenario;
103) according to initial filter standard or norm (initial Filter Criteria is called for short iFC), S-CSCF transmits the SIP conversation request to MMSC AS (IP Multimedia System multimedia conversation continuity application server);
104) MMSC AS knows that according to VDI this is to switch, and knows the handover information in CS territories such as needs continuation according to the Multimedia session handover information;
105) UE-A initiates a session request in the CS territory, and its called number uses territory Handover Number (DomainTransfer Number is called for short VDN), this message goes ICS node;
106) the ICS node is initiated the SIP conversation request, and called number is VDN, and this conversation request mails to the S-CSCF node;
107) according to initial filter standard or norm (initial Filter Criteria is called for short iFC), S-CSCF transmits the SIP conversation request to MMSC AS;
108～110) after MMSC AS receives the message of step 103 and step 107, merge this two conversation request, and to far-end UE-B new session more;
111～114) MMSC AS receives the 200OK of far-end, and accomplishes session and set up;
115～116) MMSC AS discharges original session in the PS1 territory;
As can be seen from Figure 2, the defective of present switching is: if after the SIP conversation request in CS territory arrives MMSC AS earlier in the step 107, have four kinds of scenes:
Scene one: this switches to the part switching, and voice conversation switches to the CS territory, all the other Multimedia session deletions.This moment, MMSC AS may receive the Bye request of sending in the PS1 territory, also possibly can not receive fully, lost suddenly like signaling mistake or wireless signal covering;
Scene two: this switches to the part switching, and voice conversation switches to the CS territory, and all the other Multimedia session are retained in the PS1 territory.MMSC AS will receive in the original Multimedia session in PS1 territory, the re-INVITE request of sending;
Scene three: as Fig. 2 described, voice conversation switched to the CS territory, and all the other Multimedia session switch to the PS2 territory, and MMSC AS can receive the conversation request in PS2 territory;
Scene four: this switches to the part switching, and voice conversation switches to the CS territory, and all the other Multimedia session partly switch to the PS2 territory, and remainder is retained in the PS1 territory.MMSC AS will receive in the original Multimedia session in PS1 territory, the re-INVITE that sends, and can receive the conversation request in PS2 territory;
When step 107 arrives earlier, owing in the present technology, can not carry enough Multimedia session handover informations through the CS territory session that the ICS mode is initiated, MMSC AS does not understand it is any scene, does not therefore know how this handles.For example, in scene one, MMSC AS need not wait for the conversation request from the PS territory, and all the other scene MMSC AS need continue to wait for the request in PS territory.Cause system to go wrong.
Summary of the invention
The technical problem that the present invention will solve provides a kind of changing method that keeps multimedia conversation continuity business, when MMSC AS receives the conversation request of user in the CS territory earlier, can carry out hand-off process quickly and accurately.
In order to address the above problem, the invention provides a kind of changing method that keeps multimedia conversation continuity business, be applied to IP Multimedia System, comprising:
Subscriber equipment and remote subscriber are after packet-switched domain has been set up Multimedia session; When initiating switching and need voice conversation wherein be switched to circuit domain; In the conversation request of circuit domain, carry switching type information, this switching type information comprises said subscriber equipment and whether all the other Multimedia session is carried out the information that packet-switched domain switches;
When multimedia conversation continuity MMSC application server is received the conversation request of said circuit domain earlier; Judge the conversation request that said subscriber equipment whether can the initiation packet switching domain according to switching type information wherein; If; After the conversation request of receiving all circuit domain and packet-switched domain, send the session updates request to said remote subscriber again, otherwise directly send the session updates request to said remote subscriber; After sending said session updates request, continue follow-up hand-off process.
Further, said subscriber equipment then switches to voice conversation circuit domain and deletes all the other Multimedia session in said switching type information indication as when voice conversation is switched to circuit domain, deleting all the other Multimedia session;
When said MMSC application server is received said Client-initiated circuit domain conversation request earlier, directly send the session updates request, and carry out follow-up hand-off process to said remote subscriber.
Further; Said subscriber equipment switches as when voice conversation is switched to circuit domain, all the other Multimedia session being carried out packet-switched domain; To different handoff scenario; Said subscriber equipment all adopts identical indication in said switching type information, promptly indicate voice conversation is switched to circuit domain, and all the other Multimedia session are carried out the packet-switched domain switching;
When said MMSC application server is received the circuit domain conversation request of said subscriber equipment initiation earlier; Wait for the packet-switched domain conversation request that said subscriber equipment is initiated; From the Multimedia session handover information of packet-switched domain conversation request, know current handoff scenario; After receiving all packet-switched domain conversation request that said subscriber equipment is initiated under the current handoff scenario, send the session updates request to said remote subscriber.
Further, said subscriber equipment switches as when voice conversation is switched to circuit domain, all the other Multimedia session being carried out packet-switched domain, and to different handoff scenario, said subscriber equipment is the current handoff scenario of concrete indication in said switching type information;
When said MMSC application server is received the circuit domain conversation request of said subscriber equipment initiation earlier; Directly judge current handoff scenario; After receiving all packet-switched domain conversation request that said subscriber equipment is initiated under the current handoff scenario, send the session updates request to said remote subscriber.
Further; Said need comprise four kinds of scenes with the switching that voice conversation switches to circuit domain; First kind of scene is when voice conversation is switched to circuit domain and deletes all the other Multimedia session; Other three kinds of scenes all are when voice conversation is switched to circuit domain all the other Multimedia session to be carried out packet-switched domain to switch, and are specific as follows:
All the other Multimedia session all are retained in original packet-switched domain, and said subscriber equipment will be in the Multimedia session of original packet-switched domain under this scene, and re-INVITE initiates a session request;
All the other Multimedia session partly are retained in original packet-switched domain; Remainder switches to new packet-switched domain; Said subscriber equipment will be in the Multimedia session of original packet-switched domain under this scene, and the re-INVITE that initiates a session request initiates a session request at new packet-switched domain;
Said all the other Multimedia session are all switched to new packet-switched domain, and said subscriber equipment will initiate a session request at new packet-switched domain under this scene.
Further, in the conversation request of said circuit domain, represent said switching type information as called number through the territory Handover Number.
Further; In the conversation request of said circuit domain; Indicate through a territory Handover Number voice conversation is switched to circuit domain and deletes all the other Multimedia session; Indicate through another different territory Handover Number voice conversation is switched to circuit domain, and all the other Multimedia session are carried out packet-switched domain switch.
Further, in the conversation request of said circuit domain, indicate multiple different handoff scenario, and each territory Handover Number is unique corresponding to a kind of handoff scenario through a plurality of territories Handover Number.
Further, before the conversation request of initiating said circuit domain, all preserve the information of the territory Handover Number of switching type and correspondence thereof in said subscriber equipment and the MMSC application server;
The information of said switching type and corresponding territory Handover Number thereof be static configuration in subscriber equipment, or subscriber equipment dynamically obtains in registration process or in the session in the past;
The information of said switching type and corresponding territory Handover Number thereof be static configuration in the MMSC application server, or the MMSC application server obtains from other network element.
Further, said subscriber equipment is the subscriber equipment of IP Multimedia System multimedia conversation continuity business and IP Multimedia System centralized traffic of having contracted.
In sum; The present invention provides a kind of changing method that keeps multimedia conversation continuity business; MMSC and ICS contracted user and remote subscriber have been set up in a PS territory in the time of need voice conversation wherein being switched to the CS territory behind the Multimedia session; In the CS territory conversation request of initiating to MMSC AS, carry switching type information, adopt this method, also can know the PS territory conversation request that whether need wait for the user even MMSC AS receives Client-initiated CS territory conversation request earlier; And then complete quickly and accurately hand-off process, improved system effectiveness.
Description of drawings
Fig. 1 is the system framework sketch map of application scenarios of the present invention;
Fig. 2 is the flow chart that the MMSC contracted user switches to voice CS in the prior art;
Fig. 3 realizes among first and second embodiment the user's voice business is carried out that CS switches and the process chart of deleting all the other Multimedia session;
Fig. 4 realizes among first embodiment also all the other Multimedia session being carried out PS switching processing flow chart except that the user's voice business being carried out the CS switching;
Fig. 5 realizes among second embodiment also all the other Multimedia session being carried out PS switching processing flow chart except that the user's voice business being carried out the CS switching.
Embodiment
The present invention provides a kind of changing method that keeps multimedia conversation continuity business; MMSC and ICS contracted user and remote subscriber have been set up in a PS territory in the time of need voice conversation wherein being switched to CS behind the Multimedia session; In the CS territory conversation request of initiating to MMSC AS, carry switching type information, whether needs carry out the PS switching to MMSC AS if can judge all the other Multimedia session according to switching type information wherein after receiving CS territory conversation request earlier.The conversation request that subscriber equipment sends will be passed through a plurality of equipment and could be arrived MMSC AS, and also difference of the concrete message that adopts when between distinct device, transmitting, and owing to adopting the prior standard flow process, no longer gives unnecessary details here.
Below in conjunction with accompanying drawing and embodiment the present invention is done further explain.
With two embodiment the processing under four kinds of application scenarioss is described below; The processing method of first kind of scene of these two embodiment is identical; The processing method of its excess-three kind scene all is that the user carries when initiating CS territory conversation request and can inform that all the other Multimedia session of MMSC AS will carry out the switching type information that PS switches; After MMSC AS receives this CS territory conversation request, knowing needs to wait for the PS conversation request of user in the initiation of PS territory; The difference of these two embodiment is; First embodiment describes is that the user only informs that MMSC AS need wait for the PS conversation request that it is initiated in the PS territory when initiating CS territory conversation request, not have the current handoff scenario of concrete indication, is that the user clearly informs the handoff scenario that MMSC AS is concrete during the conversation request of initiation CS territory in the CS territory and second embodiment describes.
First embodiment
Fig. 3 realizes that for present embodiment the user's voice business is carried out CS switches the process chart of deleting all the other Multimedia session; This scene is that user UE-A and far-end UE-B have set up Multimedia session A on PS1 territory (Access Network A); For a certain reason, UE-A needs to switch.It switches to the CS territory with voice conversation, deletes all the other Multimedia session, may further comprise the steps:
201) the UE-A decision switches to the CS territory with voice conversation, deletes all the other Multimedia session;
202) UE-A initiates a session request in the CS territory; In this conversation request, represent switching type information with specific territory Handover Number VDN-A; Be that expression switches to voice conversation the CS territory and deletes all the other Multimedia session, UE-A mails to the ICS node with this conversation request here;
Represent switching type information with specific territory Handover Number VDN-A in the present embodiment; Switching type and corresponding territory Handover Number can static configuration in subscriber equipment, subscriber equipment also can dynamically obtain the corresponding relation of this territory Handover Number and switching type in registration process or in the session in the past.Switching type and corresponding territory Handover Number thereof can be pre-configured among the MMSC AS, and MMSC AS also can obtain this information from other network elements through other modes.But the present invention can but be not limited to represent this switching type information as called number with this territory Handover Number VDN-A.
203) the ICS node sends the SIP conversation request to the S-CSCF node, carries territory Handover Number VDN-A;
204) after the S-CSCF node is received the SIP conversation request, trigger, this SIP conversation request is transmitted to MMSC AS according to iFC;
205) after MMSC AS receives the SIP conversation request; Know that according to territory Handover Number VDN-A the current application scene is that voice conversation is switched to the CS territory and deletes all the other Multimedia session; MMSC AS directly sends the session updates request to far-end UE-B, and this request at first sends to S-CSCF;
206) S-CSCF upgrades session and asks to be transmitted to UE-B;
Step 205,206 message can be the SIP conversation request, or the SIP updating message;
207) UE-B replys to S-CSCF transmission 200OK;
208) S-CSCF is transmitted to MMSC AS with 200OK;
209) MMSC AS completion and UE-A set up in the session in CS territory;
210) only switch CS territory voice owing in step 205, showing, therefore after switching completion, MMSC AS deletion and UE-A are at the Multimedia session A in PS1 territory;
211) UE-A confirms that to MMSC AS transmission 200OK session A is deleted;
As shown in Figure 4, be its excess-three kind handoff scenario in the present embodiment, promptly user UE-A and remote subscriber UE-B have set up Multimedia session A on PS1 territory (Access Network A), and for a certain reason, UE-A needs to switch.It switches to the CS territory with voice conversation, and all the other Multimedia session possibly be retained in original PS1 territory, possibly all switch to the PS2 territory, also possibly partly be retained in the PS1 territory, and remainder switches to the PS2 territory.At this moment; The user carries switching type information in the conversation request in CS territory; This switching type information only representes that voice conversation carries out CS and switches; All the other Multimedia session will carry out the PS territory and switch, and concrete variation need be carried in the conversation request of PS territory, inform that promptly MMSC AS need wait for the PS territory conversation request that UE-A initiates in the PS territory.It may further comprise the steps:
301) the UE-A decision switches to the CS territory with voice, and all the other Multimedia session carry out the PS territory and switch;
302) UE-A initiates a session request in the CS territory; Called number VDN-B with wherein representes switching type information; This switching type information representation voice conversation carries out CS and switches; All the other Multimedia session will carry out the PS territory and switch, and at this moment, current handoff scenario possibly be in the following scene one: all the other Multimedia session all are retained in original PS1 territory; All the other Multimedia session all switch to the PS2 territory; Perhaps all the other Multimedia session partly are retained in the PS1 territory, and remainder switches to the PS2 territory;
VDN-B is the same with VDN-A also to be a territory Handover Number corresponding to certain switching type information, VDN-B and with the configuration of the corresponding relation of switching type or obtain to adopt the mode identical with VDN-A.
303) the ICS node is initiated the SIP conversation request to the S-CSCF node, and carrying called number is VDN-B;
304) after S-CSCF receives conversation request, trigger, this SIP conversation request is transmitted to MMSC AS according to iFC;
305) UE-A in step 302 simultaneously; In the original Multimedia session in PS 1 territory, initiate a session request (re-INVITE) wherein comprised the Multimedia session handover information; Specifically indicated current handoff scenario at this Multimedia session handover information, UE-A issues the S-CSCF node with this conversation request;
306) after S-CSCF receives the request of step 305, this request is transmitted to MMSC AS;
307) UE-A initiates a session request in the PS2 territory in step 302 simultaneously, and wherein called number is that sign VDI is switched in the territory, and has comprised the Multimedia session handover information, and this Multimedia session handover information has specifically been indicated current handoff scenario.UE-A issues the S-CSCF node with this conversation request.Said territory switch sign VDI can be static configuration in subscriber equipment, also can be dynamically to obtain in registration process or in the session in the past;
308) after S-CSCF receives conversation request, this conversation request is transmitted to MMSC AS;
Above-mentioned steps 302,305,307th, concurrent.And for different scenes, some above-mentioned step possibly not have.When all the other Multimedia session are retained in original PS1 territory, step 307 then, 308 do not have; When all the other Multimedia session all switch to the PS2 territory, step 305 then, 306 do not have; When the part Multimedia session is retained in the PS1 territory, the remainder Multimedia session switches to the PS2 territory, and above-mentioned steps all needs.
When the part Multimedia session is retained in the PS1 territory, when the remainder Multimedia session switches to the PS2 territory, can initiate a session request in two PS territories, can only carry the Multimedia session handover information in a conversation request therein.Arrive MMSC AS earlier if carry the PS territory conversation request of Multimedia session handover information, point out voice component in the CS territory because it switches in the description, so MMSC AS can continue to wait for.If what arrive subsequently is another PS territory conversation request of carrying the Multimedia session handover information, then MMSC AS receives complete information, continues to wait for CS territory voice conversation request; If what arrive soon after is CS territory conversation request; According to VDN-B; MMSC AS knows that concrete switching type information should carry in PS territory conversation request; And first PS territory conversation request of receiving is not carried, and then continues to wait for another PS territory conversation request of carrying the Multimedia session handover information.
309), know that according to called number VDN-B needs continue to wait for the conversation request in PS territory if MMSC AS receives the message of step 304 earlier; If receive the message of step 306 or step 308 earlier, then basis Multimedia session handover information wherein knows it is that any scene is switched, and therefore can wait for the request in other territory when needed.After MMSC AS received whole requests, MMSC AS sent the session updates request to far-end UE-B, and this request at first sends to the S-CSCF node;
310) S-CSCF upgrades session and asks to transmit to UE-B
Step 309 and 310 message can be the SIP conversation request, or the SIP updating message;
311) UE-B sends 200OK and replys this message arrival S-CSCF;
312) S-CSCF is transmitted to MMSC AS with 200OK;
313) MMSC AS completion and UE-A are in the foundation of CS territory session;
314) renewal of the Multimedia session A on the PS1 territory of MMSC AS completion and UE-A;
315) foundation of the Multimedia session on the PS2 territory of MMSC AS completion and UE-A;
316) if voice switch to the CS territory, all the other multimedias switch to the PS2 territory, and after switching was accomplished, MMSC AS deletion and UE-A were at the Multimedia session A in PS1 territory;
317) UE-A confirms that to MMSC AS transmission 200OK session A is deleted;
Annotate: for different scenes, some possibly not have above-mentioned steps 314～317.When all the other Multimedia session all are retained in original PS1 territory, step 315 then, 316,317 do not have; When all the other Multimedia session all switch to the PS2 territory, then step 314 does not have; When the part Multimedia session is retained in the PS1 territory, the part Multimedia session switches to the PS2 territory, step 316 then, and 317 do not have.
Second embodiment
First kind of scene of present embodiment is about to that the user's voice business carries out that CS switches and to delete the handling process of all the other Multimedia session said with first embodiment Fig. 3, repeats no more here.
Be illustrated in figure 5 as its excess-three kind handoff scenario of present embodiment, promptly user UE-A and far-end UE-B set up Multimedia session A on PS1 territory (Access Network A), and for a certain reason, UE-A needs to switch.It switches to the CS territory with voice, and all the other medium possibly be retained in original PS1 territory, possibly all switch to the PS2 territory, also possibly partly be retained in the PS1 territory, and remainder switches to the PS2 territory.At this moment, the CS territory conversation request that the user initiates in the CS territory is carried switching type information, and this switching type information has specifically been indicated current handoff scenario, and this moment, the user can carry the information of describing handoff scenario in the conversation request that initiate in the PS territory, also can not carry.It may further comprise the steps:
401) the UE-A decision begins to switch;
402) UE-A initiates a session request in the CS territory, and voice switch to the CS territory, and all the other Multimedia session possibly be retained in original PS1 territory, possibly all switch to the PS2 territory, also possibly partly be retained in PS1 territory part and switch to the PS2 territory.Switching type information in the conversation request has specifically been indicated current any handoff scenario that belongs to, and UE-A mails to the ICS node with this conversation request;
Present embodiment is represented 4 kinds of different handoff scenario with 4 different VDN respectively as called number, and promptly different handoff scenario is used the VDN of this scene of ability unique identification, but the invention is not restricted to this.These VDN and with the configuration of the corresponding relation of switching type or obtain to adopt the mode identical with above-mentioned VDN-A.
403) the ICS node sends the SIP conversation request to the S-CSCF node;
404) after S-CSCF receives the SIP conversation request, this SIP conversation request is transmitted to MMSCAS;
405) UE-A is in step 402; In the original Multimedia session in PS1 territory; Initiate a session request (re-INVITE), wherein comprised the Multimedia session handover information, this moment, the Multimedia session handover information was overseas except pointing out that voice switch to CS; The information that can also comprise the current handoff scenario of concrete indication can not comprise yet.UE-A issues the S-CSCF node with this conversation request; If comprise the information of indicating current handoff scenario, can adopt the header field of SIP or Tag field to describe;
406) after S-CSCF receives conversation request, this conversation request is transmitted to MMSC AS;
407) UE-A is in step 402; Initiate a session request in the PS2 territory; Wherein called number is that sign VDI is switched in the territory, and VDI comprises the Multimedia session handover information, and this moment, the Multimedia session handover information was overseas except pointing out that voice switch to CS; The information that can also comprise the current handoff scenario of concrete indication can not comprise yet.UE-A issues the S-CSCF node with this conversation request.Said territory switch sign VDI can be static configuration in subscriber equipment, also can be dynamically to obtain in registration process or in the session in the past; If comprise the information of indicating current handoff scenario, can adopt the header field of SIP or Tag field to describe;
408) after S-CSCF receives conversation request, this conversation request is transmitted to MMSC AS;
Above-mentioned steps 402,405 and 407 is concurrent.And for different scenes, some above-mentioned step possibly not have.When all the other Multimedia session are retained in original PS1 territory, step 407 then, 408 do not have; When all the other Multimedia session all switch to the PS2 territory, step 405 then, 406 do not have; When the part Multimedia session is retained in the PS1 territory, the remainder Multimedia session switches to the PS2 territory, and above-mentioned steps all needs.
409),, just know it is which kind of handoff scenario according to VDN corresponding to current handoff scenario if MMSC AS receives the conversation request of step 404 earlier; If receive the conversation request of step 406 or step 408 earlier, then basis Multimedia session handover information is wherein known and need be waited for CS territory conversation request.If the Multimedia session handover information in step 406 or the step 408 has comprised the information of the current handoff scenario of concrete indication; MMSC AS just knows it is which kind of switching; Even the Multimedia session handover information does not comprise the information of the current handoff scenario of concrete indication, because it points out that voice are in the CS territory, the inevitable waiting step 404 of MMSC AS; After receiving the conversation request of step 404, also can confirm it is any handoff scenario.After MMSC AS received whole conversation request, MMSC AS sent the session updates request to far-end UE-B, and this request at first sends to S-CSCF;
410) S-CSCF upgrades session and asks to transmit to UE-B
Step 409,410 message can be the SIP conversation request, or the SIP updating message;
411) UE-B sends 200OK and replys this message arrival S-CSCF;
412) S-CSCF is transmitted to MMSC AS with 200OK;
413) MMSC AS completion and UE-A are in the foundation of CS territory session;
414) renewal of the Multimedia session A on the PS1 territory of MMSC AS completion and UE-A;
415) foundation of the Multimedia session on the PS2 territory of MMSC AS completion and UE-A;
416) if voice conversation switches to the CS territory, all the other Multimedia session switch to the PS2 territory, and after switching was accomplished, MMSC AS deletion and UE-A were at the Multimedia session A in PS1 territory;
417) UE-A confirms that to MMSC AS transmission 200OK session A is deleted;
Annotate: for different scenes, some possibly not have above-mentioned steps 414～417.When all the other Multimedia session all are retained in original PS1 territory, then there is not step 415,416,417; When all the other Multimedia session all switch to the PS2 territory, then there is not step 414; When the part Multimedia session is retained in the PS1 territory, the remainder Multimedia session switches to the PS2 territory, does not then have step 416,417.
Claims (10)
1. a changing method that keeps multimedia conversation continuity business is applied to IP Multimedia System, comprising:
Subscriber equipment and remote subscriber are after packet-switched domain has been set up Multimedia session; When initiating switching and need voice conversation wherein be switched to circuit domain; In the conversation request of circuit domain, carry switching type information, this switching type information comprises said subscriber equipment and whether all the other Multimedia session is carried out the information that packet-switched domain switches;
When multimedia conversation continuity MMSC application server is received the conversation request of said circuit domain earlier; Judge the conversation request that said subscriber equipment whether can the initiation packet switching domain according to switching type information wherein; If; After the conversation request of receiving all circuit domain and packet-switched domain, send the session updates request to said remote subscriber again, otherwise directly send the session updates request to said remote subscriber; After sending said session updates request, continue follow-up hand-off process.
2. changing method as claimed in claim 1 is characterized in that:
Said subscriber equipment then switches to voice conversation circuit domain and deletes all the other Multimedia session in said switching type information indication as when voice conversation is switched to circuit domain, deleting all the other Multimedia session;
When said MMSC application server is received said Client-initiated circuit domain conversation request earlier, directly send the session updates request, and carry out follow-up hand-off process to said remote subscriber.
3. according to claim 1 or claim 2 changing method is characterized in that:
Said subscriber equipment switches as when voice conversation is switched to circuit domain, all the other Multimedia session being carried out packet-switched domain; To different handoff scenario; Said subscriber equipment all adopts identical indication in said switching type information; Promptly indicate voice conversation is switched to circuit domain, and all the other Multimedia session are carried out the packet-switched domain switching;
When said MMSC application server is received the circuit domain conversation request of said subscriber equipment initiation earlier; Wait for the packet-switched domain conversation request that said subscriber equipment is initiated; From the Multimedia session handover information of packet-switched domain conversation request, know current handoff scenario; After receiving all packet-switched domain conversation request that said subscriber equipment is initiated under the current handoff scenario, send the session updates request to said remote subscriber.
4. according to claim 1 or claim 2 changing method is characterized in that:
Said subscriber equipment switches as when voice conversation is switched to circuit domain, all the other Multimedia session being carried out packet-switched domain, and to different handoff scenario, said subscriber equipment is the current handoff scenario of concrete indication in said switching type information;
When said MMSC application server is received the circuit domain conversation request of said subscriber equipment initiation earlier; Directly judge current handoff scenario; After receiving all packet-switched domain conversation request that said subscriber equipment is initiated under the current handoff scenario, send the session updates request to said remote subscriber.
5. changing method as claimed in claim 1 is characterized in that:
Said need comprise four kinds of scenes with the switching that voice conversation switches to circuit domain; First kind of scene is when voice conversation is switched to circuit domain and deletes all the other Multimedia session; Other three kinds of scenes all are when voice conversation is switched to circuit domain all the other Multimedia session to be carried out packet-switched domain to switch, and are specific as follows:
All the other Multimedia session all are retained in original packet-switched domain, and said subscriber equipment will be in the Multimedia session of original packet-switched domain under this scene, and re-INVITE initiates a session request;
All the other Multimedia session partly are retained in original packet-switched domain; Remainder switches to new packet-switched domain; Said subscriber equipment will be in the Multimedia session of original packet-switched domain under this scene, and the re-INVITE that initiates a session request initiates a session request at new packet-switched domain;
Said all the other Multimedia session are all switched to new packet-switched domain, and said subscriber equipment will initiate a session request at new packet-switched domain under this scene.
6. changing method as claimed in claim 1 is characterized in that:
In the conversation request of said circuit domain, represent said switching type information as called number through the territory Handover Number.
7. changing method as claimed in claim 3 is characterized in that:
In the conversation request of said circuit domain; Indicate through a territory Handover Number voice conversation is switched to circuit domain and deletes all the other Multimedia session; Indicate through another different territory Handover Number voice conversation is switched to circuit domain, and all the other Multimedia session are carried out packet-switched domain switch.
8. changing method as claimed in claim 4 is characterized in that:
In the conversation request of said circuit domain, indicate multiple different handoff scenario through a plurality of territories Handover Number, and each territory Handover Number is unique corresponding to a kind of handoff scenario.
9. changing method as claimed in claim 6 is characterized in that:
Before the conversation request of initiating said circuit domain, all preserve the information of the territory Handover Number of switching type and correspondence thereof in said subscriber equipment and the MMSC application server;
The information of said switching type and corresponding territory Handover Number thereof be static configuration in subscriber equipment, or subscriber equipment dynamically obtains in registration process or in the session in the past;
The information of said switching type and corresponding territory Handover Number thereof be static configuration in the MMSC application server, or the MMSC application server obtains from other network element.
10. changing method as claimed in claim 1 is characterized in that:
Said subscriber equipment is the subscriber equipment of IP Multimedia System multimedia conversation continuity business and IP Multimedia System centralized traffic of having contracted.
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| CN101686519B (en) * | 2008-09-27 | 2012-11-28 | 中兴通讯股份有限公司 | Switch method for keeping continuity of multimedia session |
| CN102273264B (en) * | 2008-11-10 | 2014-05-28 | 爱立信电话股份有限公司 | Methods and apparatuses for single radio voice call continuity (SRVCC) from CS to LTE |
| CN102006269B (en) * | 2009-08-28 | 2013-10-16 | 中兴通讯股份有限公司 | Synchronization method and system for multi-session capability of IP multimedia subsystem |
| CN102045299B (en) * | 2009-10-19 | 2014-02-05 | 中兴通讯股份有限公司 | Method and system for realizing service continuity of simple module |
| CN102056255B (en) * | 2009-11-11 | 2014-03-12 | 中兴通讯股份有限公司 | Session switching implementation method and system |
| CN102469438B (en) * | 2010-11-16 | 2015-09-16 | 中兴通讯股份有限公司 | A kind of method and apparatus of updating transfer number when in registration |
| CN102802222B (en) * | 2011-05-26 | 2017-06-06 | 中兴通讯股份有限公司 | The acquisition methods and system of a kind of E SRVCC STN SR |
| CN102739669B (en) * | 2012-06-26 | 2018-05-11 | 中兴通讯股份有限公司 | The conversation switching method and EATF of IMS network |
| CN104980982A (en) * | 2014-04-01 | 2015-10-14 | 中兴通讯股份有限公司 | Method and device switching voice service between CS domain and PS domain and mobile terminals |
| CN105228206B (en) * | 2014-05-27 | 2018-11-30 | 中国电信股份有限公司 | Switching method and system between packet-switched domain and circuit switched domain voice business |
| CN104519537A (en) * | 2014-12-31 | 2015-04-15 | 华为技术有限公司 | Communication method, user equipment and communication device |
| CN108156634B (en) * | 2016-12-02 | 2022-08-19 | 中兴通讯股份有限公司 | Service processing method, device and system |
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