CN101651896B - Method for associating multimedia sessions - Google Patents
Method for associating multimedia sessions Download PDFInfo
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- CN101651896B CN101651896B CN2008101419267A CN200810141926A CN101651896B CN 101651896 B CN101651896 B CN 101651896B CN 2008101419267 A CN2008101419267 A CN 2008101419267A CN 200810141926 A CN200810141926 A CN 200810141926A CN 101651896 B CN101651896 B CN 101651896B
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Abstract
The invention discloses a method for associating sessions, which comprises the following steps that: when receiving a media increase request sent to UE-1 by UE-2 and determining that the media request needs to be transmitted through a PS domain, an SC AS initiates a new call request to the UE-1 and adds a switching sign in the new call request; and after receiving the new call request, the UE-1 establishes a new association between a call and a session D established between the UE-1 and the UE-2 in a CS domain. Thus, the method ensures the correctness of switching the multimedia sessions.
Description
Technical field
The present invention relates to the communications field, relate more specifically to keep in a kind of IMS system correlating method of multimedia conversation continuity business.
Background technology
IP (network interconnection agreement, Internet Protocol, be called for short IP) IP multimedia subsystem, IMS (IP Multimedia Core Network Subsystem, be called for short IMS) be by third generation partner program (3rd Generation Partnership Project, abbreviation 3GPP) a kind of IP-based network framework that proposes, it has made up an opening and service environment flexibly, supports multimedia application, and provides abundant multimedia service 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 (Wireless Local Area Network, WLAN (wireless local area network)) etc. packet access network 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 (Circuit Switched is called for short CS) territory, can provide basic speech business for the user, and based on the supplementary service of speech business.When IMS is inserted in the CS territory, it develops into a kind of access way, business provides by IMS is unified fully, this technology is called IMS centralized traffic (IMS Centralized Service, be called for short ICS), the ICS Architecture characteristic is exactly under some scene, calling for the foundation of CS territory, except that traditional CS domain signaling, also have a special control signaling paths, it may be to utilize the SIP interface on the PS territory, also may be to use other particular form, such as unstructured supplementary service data (Unstructured Supplementary Service Data is called for short USSD).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 (Multimedia Session Continuity is called for short MMSC).Finish the core network element of multimedia conversation continuity function, be referred to as business continuance application server (Service Continuity Application Server is called for short SC AS).
The MMSC technology allows the user to initiate or receive multimedia call from a plurality of Access Networks, such as under UTRAN (Universal Terrestrial Radio Access Network) environment, voice make a call from the CS territory, arrive SC AS through MGCF, other multimedia (as video) then makes a call from the PS territory, these rise exhales along this part increase of P-CSCF (Proxy-CSCF) to be because have in the accompanying drawing, must to mention in the specification.After arriving SC AS, SC AS has pooling function can merge into a calling to these callings, continues to call out to remote subscriber, and Fig. 1 has shown this scene.When exhaling eventually, when multimedia is exhaled the SC AS that arrives service UE eventually, SC AS has separation function, it can initiate audio call to exhale eventually along the CS territory, other multimedia (as video) is then initiated along the PS territory to exhale eventually, after UE receives these two callings, by the interactive information in the calling procedure, know the relation between these two sessions, Fig. 2 has shown this scene.
The MMSC technology also allows user UE to initiate to switch between different access networks, switch to the PS territory such as the PS between WLAN (Wireless Local area network) and the LTE (Long Term Evolution), also have PS territory and PS+CS territory to switch in addition, as: the original access network of user is WLAN, set up a Multimedia session this moment, its voice and all the other multimedias are all on WLAN, when the user switches to UTRAN, because the PS territory of UTRAN can't provide speech business, voice in original Multimedia session switch to the CS territory of UTRAN, and all the other medium switch to the PS territory of UTRAN; Conversely, when the user inserted and initiated Multimedia session at UTRAN, phonological component wherein was in the CS territory, and other multimedia is in the PS territory, and after switching to WLAN, all medium all switch to the PS territory of WLAN, merge into a session.Fig. 3 has shown this two handoff scenario.
When the user in the multimedia call handoff procedure: if the switching that takes place is the switching of PS-＞PS, or the switching of CS-＞PS, the user is in new PS territory, use session to switch sign (Session Transfer Identifier, be called for short STI) make a call, after calling out arrival SC AS, SC AS knows that according to this sign this is to switch to new PS territory; When the user when the PS territory switches to the CS territory, the user uses session Handover Number (Session Transfer Number is called for short STN) to make a call in the CS territory, call out arrive SC AS after, SC AS knows that according to this sign this is that voice switch to the CS territory from the PS territory.After each session is set up, a corresponding with it STN can be arranged all, STI, they can be static configuration on UE, also can be SC AS dynamic assignment, and back UE be set up in session and SC AS knows these signs and which session association.
Among Fig. 3, the user switches to the process of WLAN from UTRAN, and precondition is that UE knows that the CS session on the UTRAN territory is related with the PS media session, can be merged into a session when switching to WLAN, uses same STI to switch.
But, have such handoff scenario, as shown in Figure 4: user UE-1 has set up voice conversation in CS territory and remote subscriber UE-2, and this session has been anchored on the SC AS, and on the PS territory between UE-1 and the SC AS, there be not any control signaling session relevant with this session.At this moment, remote subscriber UE-2 adds medium for this session, and after session updates arrived SC AS, SC AS decision was based upon the PS territory with the multimedia that increases, and SC AS initiates to exhale eventually to UE-1 at PS subsequently, sets up session.Step is as follows:
101) UE-2 increases medium to session, and this session updates request arrives SC AS, has wherein comprised the information of newly-increased medium;
102) SC AS judges, and these newly-increased medium can not be based upon the CS territory, can only be based upon the PS territory;
103) SC AS makes a call to user UE-1 at PS, and this conversation request arrives S-CSCF
104) S-CSCF sends to UE-1 with the session request via PS;
105) session between UE-1 and the SC AS is set up and is finished
106) SC AS finishes the renewal to far-end;
At this moment, the existing voice of session between UE-1 and the far-end UE-2 also have data medium.Calling between SC AS and the far-end UE-2 connects constant, and the session between SC AS and the UE-1 is made up of 2 session branch, and one is the session of CS territory, and one is the session of PS territory.
But there is a problem in this flow process, and after the conversation message in step 104 arrived UE-1, UE-1 can't can produce a lot of problems to this call request and the session association that has existed.Such as, UE-1 feels own can refuse the session of PS territory busy, and perhaps in the handoff procedure in future, such as switching in the LTE system, UE-1 may initiate handoff request respectively these two sessions as two independent sessions.And under the normal condition, according to Fig. 3, switch to LTE after, should become a session.Like this, after handoff request arrived SC AS, SC AS did not have enough information with two session associations, causes system to go wrong.
Summary of the invention
The invention provides a kind of method of session association, be applied to the professional continuously system of session, described system comprises multimedia terminal UE-1 and serves the business continuance application server SC AS of described UE-1, service call session control function entity S-CSCF and far-end multimedia terminal UE-2, wherein said UE-1 has set up session D in CS territory and UE-2, and described Session Anchor is characterized in that to the business continuance application server, said method comprising the steps of:
A, receive the increase medium request that UE-2 sends to UE-1 as SC AS, and judge that described medium request need transmit by the PS territory, then initiate new call request, in described new call request, increase and switch sign to UE-1;
After B, UE-1 receive described new call request, set up related between the session D of CS territory and UE-2 foundation of new calling and UE-1 according to the sign of the switching in the described new call request.
Further, after step B, UE-1 is that described new call request is set up session in PS territory and SC AS, and upgrades the session of SC AS and UE-2.
Further, described switching identifies the session Handover Number STN of the UE-1 that is or the session switching sign STI of UE-1.
Further, described session Handover Number STN or session switch sign STI be static configuration in UE-1, and also pre-configured at SC AS.
Further, described switching sign is to set up in the conversation procedure in the CS territory at described UE-1 and UE-2, and SC AS gives the switching sign of described session dynamic assignment, and sends to UE-1 and be kept at this locality.
Further, steps A also comprises, described SC AS receives the increase medium request that UE-2 sends to UE-1, and SC AS judges that the foundation that medium transmit in the PS territory is the descriptor of the medium of request increase, and the Access Network information of UE-1 is the CS territory among the described session D that has set up.
Benefit of the present invention is, for new session and existing CS territory session association are got up, especially using staticly when switching sign, do not needing existing CS territory session to set up process special secondary school pupil and become to be used for a related sign, with regard to not needing CS session to set up process any modification is not being arranged like this.Guarantee the correctness that Multimedia session switches.
Description of drawings
Fig. 1 is the schematic diagram that multimedia conversation continuity UE makes a call in a plurality of territories;
Fig. 2 is after to be SC AS with the different medium in the incoming call session separate, by different switch domain terminating calls to UE;
Fig. 3 is that multiple domain switches schematic diagram;
Fig. 4 is the prior art flow chart of application scenarios of the present invention;
Fig. 5 is an embodiments of the invention flow chart one;
Fig. 6 is the embodiments of the invention flowchart 2s.
Embodiment
The invention provides a kind of session association method that keeps multimedia conversation continuity business.
Below in conjunction with the drawings and specific embodiments the present invention is described in further detail.
Fig. 5 is a first embodiment of the invention, and UE-1 has set up voice conversation D1 with remote subscriber UE-2, and this session has been anchored into the SC AS of this UE-1 of service.In the UE-1 side, this voice conversation is carried on the CS territory.And, on the path, PS territory between this UE-1 and the SC AS, do not have the SIP signaling control relevant with this session.In the foundation of voice conversation D1, SC AS does not distribute the switching sign to this session, it is that static configuration is switched sign STI in the session of UE-1 that the switching of this session can be used static switching sign, or static configuration is at the session Handover Number STN of UE-1, the static state of the last configuration of UE-1 is switched sign, SC AS knows that in advance SC AS knows each SC user's static state switching sign.For sake of convenience, we are referred to as CS/IMS intermediate nodes to the network elements such as P-CSCF in the MGCF in CS territory and PS territory, its effect is to finish continuing of the signaling of session and carrying, because this part content and invention are irrelevant, is referred to as CS/IMS intermediate nodes.
After UE-2 added new medium, session may further comprise the steps:
201) remote subscriber UE-2 increases medium to session, and the session updates request arrives SC AS, has wherein comprised the information that increases medium newly;
202) SC AS judges that according to the descriptor that increases medium newly in the session updates request these medium can not transmit at CS, and the Access Network information of UE-1 is that the CS territory is a video media such as finding in the described session of having set up, and can't transmit in the CS territory.SC AS decision is set up session in the PS territory and is transmitted this medium;
203) SC AS initiates new call request along the PS territory to UE-1, this calling at first arrives S-CSCF, wherein in the call request message, carried the switching sign of static configuration on the user UE-1: can be the session Handover Number STN that UE-1 goes up static configuration, or UE-1 goes up the session switching sign STI of static configuration;
204) S-CSCF is transmitted to UE-1 with call request in the PS territory;
205) after UE-1 receives call request,, know that this session is that the voice conversation D1 that set up with the CS territory is relevant, belongs to same session according to the switching in call request sign;
206) UE-1 finishes with the session of SC AS and sets up;
207) session between SC AS renewal and the UE-2.
Fig. 6 is a second embodiment of the invention, and UE-1 has set up voice conversation D1 with remote subscriber UE-2, and this session has been anchored into the SC AS of this UE-1 of service.In the UE-1 side, this voice conversation is carried on the CS territory.And, on the path, PS territory between this UE-1 and the SC AS, do not have the SIP signaling control relevant with this session.In the foundation of voice conversation D1, SC AS has distributed dynamic switching sign for this session, and it may be that sign STI is switched in dynamic session, also may be dynamic session Handover Number STN.For sake of convenience, we are referred to as CS/IMS intermediate nodes to the network elements such as P-CSCF in the MGCF in CS territory and PS territory, its effect is to finish continuing of the signaling of session and carrying, because this part content and invention are irrelevant, is referred to as CS/IMS intermediate nodes.
Session is set up and UE-2 adds new medium etc., may further comprise the steps:
300) UE-1 has set up voice conversation D1 with remote subscriber UE-2, and this Session Anchor is to SC AS, and SC AS given this session dynamic assignment and switch sign, and sends to UE-1;
301) remote subscriber UE-2 increases medium to session, and the session updates request arrives SC AS, has wherein comprised the information that increases medium newly;
302) SC AS judges that according to the descriptor that increases medium newly in the session updates request these medium can not transmit at CS, and the Access Network information of UE-1 is that the CS territory is a video information such as finding in the described session of having set up, and can't transmit in the CS territory.SC AS decision is set up session in the PS territory and is transmitted this medium;
303) SC AS initiates new call request along the PS territory to UE-1, this calling at first arrives S-CSCF, wherein in the call request message, carried the switching sign that SC AS dynamic assignment is given the session D1 of UE-1: can be session Handover Number STN, or sign STI is switched in session;
304) S-CSCF is transmitted to UE-1 with call request in the PS territory;
305) after UE-1 receives call request,, know that this session is that the voice conversation D1 that set up with the CS territory is relevant, belongs to same session according to the switching in call request sign;
306) UE-1 finishes with the session of SC AS and sets up;
307) session between SC AS renewal and the UE-2.
Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (6)
1. the method for a session association, be applied to the professional continuously system of session, described system comprises multimedia terminal UE-1 and serves the business continuance application server SC AS of described UE-1, service call session control function entity S-CSCF and far-end multimedia terminal UE-2, wherein said UE-1 has set up session D in CS territory and UE-2, and described Session Anchor is characterized in that to the business continuance application server, said method comprising the steps of:
A, receive the increase medium request that UE-2 sends to UE-1 as SC AS, and judge that described medium request need transmit to UE-1 by the PS territory, then initiate new call request, in described new call request, increase and switch sign to UE-1;
After B, UE-1 receive described new call request, set up related between the session D of CS territory and UE-2 foundation of new calling and UE-1 according to the sign of the switching in the described new call request.
2. the method for claim 1 is characterized in that, after step B, UE-1 is that described new call request is set up session in PS territory and SC AS, and upgrades the session of SC AS and UE-2.
3. the method for claim 1 is characterized in that, sign STI is switched in session Handover Number STN that described switching sign is UE-1 or the session of UE-1.
4. method as claimed in claim 3 is characterized in that,
Described session Handover Number STN or session switch sign STI be static configuration in UE-1, and also pre-configured at SC AS.
5. the method for claim 1 is characterized in that,
Described switching sign is to set up in the conversation procedure in the CS territory at described UE-1 and UE-2, and SC AS gives the switching sign of described session dynamic assignment, and sends to UE-1 and be kept at this locality.
6. the method for claim 1 is characterized in that,
Steps A also comprises, described SC AS receives the increase medium request that UE-2 sends to UE-1, SC AS judges that the foundation that medium transmit in the PS territory is the descriptor of the medium of request increase, and the Access Network information of UE-1 is the CS territory among the described session D that has set up.
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| CN2008101419267A CN101651896B (en) | 2008-08-15 | 2008-08-15 | Method for associating multimedia sessions |
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| CN2008101419267A CN101651896B (en) | 2008-08-15 | 2008-08-15 | Method for associating multimedia sessions |
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| CN101651896B true CN101651896B (en) | 2011-12-28 |
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| CN105264858B (en) * | 2013-12-23 | 2019-03-08 | 华为终端有限公司 | A kind of conversation processing method and equipment |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6256389B1 (en) * | 1998-04-23 | 2001-07-03 | Nortel Networks Limited | Integrated telecommunication collaboration system |
| CN1350744A (en) * | 1999-03-15 | 2002-05-22 | 声音技术通讯有限公司 | Audio and data collaboration and coordination system |
| CN1732665A (en) * | 2002-12-30 | 2006-02-08 | 思科技术公司 | Composite controller for multimedia sessions |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6256389B1 (en) * | 1998-04-23 | 2001-07-03 | Nortel Networks Limited | Integrated telecommunication collaboration system |
| CN1350744A (en) * | 1999-03-15 | 2002-05-22 | 声音技术通讯有限公司 | Audio and data collaboration and coordination system |
| CN1732665A (en) * | 2002-12-30 | 2006-02-08 | 思科技术公司 | Composite controller for multimedia sessions |
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Granted publication date: 20111228 Termination date: 20170815 |