CN101686519B - Switch method for keeping continuity of multimedia session - Google Patents
Switch method for keeping continuity of multimedia session Download PDFInfo
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- CN101686519B CN101686519B CN2008101488464A CN200810148846A CN101686519B CN 101686519 B CN101686519 B CN 101686519B CN 2008101488464 A CN2008101488464 A CN 2008101488464A CN 200810148846 A CN200810148846 A CN 200810148846A CN 101686519 B CN101686519 B CN 101686519B
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Abstract
The present invention provides a switch method for keeping continuity of multimedia session. A UE establishes multimedia session D1 between a first access network and a remote user, switches to a second access network, and sends a switch request including a first identification information in a second access network when reserving partial media of the multimedia session D1 in the first access network; the first identification information is used for identifying the partial media of the multimedia session D1 needed to be reserved in the first access network; after receiving the switch request, SC AS judges whether the media of the multimedia session D1 needed to be reserved in the first access network exists according to whether the first identification information is included in the switch request: if not SC AS releases the multimedia session D1 of the first access network after the UE successfully establishes a session in the second access network. By using the switch method, SC AS can timely know whether session in the original access network needs to be released, thus saving session resource.
Description
Technical field
The present invention relates to the communications field, relate in particular to the maintenance switching method for multimedia session continuity in a kind of IP (network interconnection agreement, Internet Protocol) IP multimedia subsystem, IMS (IP Multimedia Core Network Subsystem is called for short IMS).
Background technology
IP Multimedia System (IP Multimedia Core Network Subsystem; Be called for short IMS) be by third generation partner program (3rd Generation Partnership Project; Abbreviation 3GPP) a kind of IP-based network framework that proposes; 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).
User terminal (User Equipment is called for short UE) need keep the continuity of Multimedia session under various access waies.At this moment, the Multimedia session of UE not only need keep continuity when switching between packet switching (PacketSwitch the is called for short PS) territory, also need be 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).The core network element of accomplishing the multimedia conversation continuity function is called business continuance application server (Service ContinuityApplication Server is called for short SC AS).
Have a kind of like this handoff scenario in the MMSC technology: UE carries out Multimedia session at Access Network A; This Access Network provides the PS territory (voice all are carried in this PS territory with other medium in session this moment) of (Voice over IP, the IP-based voice) ability that has VoIP; For a certain reason (as, wireless signal variation, reasons such as charging), UE need switch to Access Network B; In this case, might whole medium be switched to Access Network B, or part of media is switched to Access Network B, with the deletion of all the other medium, or part of media switches to Access Network B, and part of media is retained in Access Network A.
Fig. 1 is that existing employing MMSC technology is carried out the method flow diagram that Multimedia session switches.As shown in Figure 1, user terminal UE-A and remote subscriber have been set up Multimedia session on PS1 territory (Access Network A), and this moment, UE-A was because a variety of causes need switch to Access Network B (PS2 territory), and concrete switching flow is following:
101) the UE-A decision begins to switch, and initiates SIP (Session Initial Protocol, initial session protocol) conversation request in the PS2 territory; Comprise in this request: sign (Session TransferIdentifier is switched in session; Be called for short STI) and need switch to the media information in PS2 territory; This request sends to the CSCF (Call Session Control Function is called for short CSCF) of UE-A ownership;
102) CSCF perhaps according to STI, transmits above-mentioned SIP conversation request to SC AS according to initial filter standard or norm (initial Filter Criteria is called for short iFC);
103) after SC AS receives above-mentioned SIP conversation request, know that according to STI needs switch Multimedia session D1, the therefore corresponding session of renewal and remote subscriber, and start a timer;
Owing to only comprise the media information that switches to neofield (PS2 territory) in the above-mentioned SIP conversation request that SC AS receives; And for the medium that do not have to switch, SC AS does not know should remain in former territory (PS1 territory), perhaps deletion or the deletion of part reserve part; For can correct handling, SC AS can start a timer after step 102, waits for then and does further processing after receiving follow-up message (106 step message or 109 step message) or timer expiry.
104) foundation of SC AS completion and the session of UE on the PS2 territory;
If the session of UE and remote subscriber also has part of media to be retained in original PS1 territory, then execution in step 105～107, otherwise jump to step 108:
105) UE accomplishes after the switching in PS2 territory, and initiation session is upgraded request in the PS1 territory, and this request is sent to CSCF;
106) CSCF transmits above-mentioned session updates request to SC AS;
107) after SC AS receives above-mentioned session updates request, the corresponding session of renewal and remote subscriber, this flow process finishes;
If do not have medium to need to keep in the PS1 territory, then carry out following steps:
108) UE accomplishes after the switching in PS2 territory, and initiation session discharges request in the PS1 territory, and this request is sent to CSCF;
109) CSCF transmits above-mentioned session release request to SC AS;
110) after SC AS receives that above-mentioned session discharges request, discharge the session on the PS1 territory, and the corresponding session of renewal and remote subscriber;
111) if owing to the reasons such as dropout of Access Network A, SC AS does not receive that above-mentioned session discharges request, and then behind the above-mentioned timer expiry of SC AS startup, SC AS can discharge the session on the PS1 territory voluntarily.
By on can know; Because UE does not comprise enough medium handover informations (promptly not comprising needs by the media information of deleting and keeping) in the SIP conversation request that comprises session switching sign that send in the PS2 territory, SC AS must wait for that session updates request or session that the UE transmission is follow-up discharge request; And can't receive under the situation of above-mentioned request owing to reasons such as Access Network A (PS1 territory) dropouts; Could discharge corresponding session after SC AS is can only waiting timer overtime; Waste the Session Resources on the signaling paths between SC AS and the UE, and the problem that mistake discharges session possibly occur.
Summary of the invention
Technical problem to be solved by this invention is, overcomes the deficiency of prior art, and a kind of maintenance switching method for multimedia session continuity is provided, and makes SC AS can in time know the session that whether need be released in former Access Network.
In order to address the above problem; The present invention provides a kind of maintenance switching method for multimedia session continuity; User terminal UE is after first Access Network and remote subscriber are set up Multimedia session D1; When switching to second Access Network and the part of media of Multimedia session D1 is retained in first Access Network, UE sends the handoff request that comprises first identification information at second Access Network; Said first identification information is used to identify the part of media that need keep Multimedia session D1 at first Access Network;
After receiving said handoff request; Whether whether business continuance application server SC AS basis comprises said first identification information judgment exists needs to be retained in the medium of the Multimedia session D1 of first Access Network: if do not exist; Then successfully setting up on second Access Network after the corresponding session with UE, SC AS discharges the Multimedia session D1 on first Access Network.
In addition, adopt following method sign in said handoff request to need to keep the part of media of Multimedia session D1:
Media description in said handoff request partly comprises the descriptor of the medium that need be retained in first Access Network, and in each descriptor with the media identification of correspondence for need be retained in first Access Network.
In addition, adopt following method sign in descriptor need be retained in the medium of first Access Network:
The media port parameter value that needs are retained in the descriptor of medium of first Access Network is set to 0.
In addition, SC AS discharges the said Multimedia session D1 of request release through send session to said UE.
In addition, said UE when switching to second Access Network and need the part of media of deletion Multimedia session D1, will be included in by the descriptor of deletion medium and send to SC AS in the said handoff request after first Access Network is set up said Multimedia session D1; Comprise in the said descriptor and be used to identify second identification information that corresponding medium are deleted;
After receiving said handoff request, SC AS if exist, then notifies the remote subscriber deletion corresponding medium according to whether comprising the medium whether said second identification information judgment exists the said Multimedia session D1 that is deleted.
In addition, the medium that adopt following method sign to be deleted: the media port parameter value by in the descriptor of deletion medium is set to negative.
In addition, the medium that adopt following method sign to be deleted: in by the descriptor of deletion medium, increase delete flag.
In addition, said UE when switching to second Access Network and need the part of media of deletion Multimedia session D1, will be included in the said handoff request by the descriptor of deletion medium after first Access Network is set up said Multimedia session D1;
After receiving said handoff request, SC AS will not be included in the medium deletion of the Multimedia session D1 in the said handoff request.
In addition; UE is after first Access Network and remote subscriber are set up Multimedia session D1; When switching to second Access Network and need the part of media of deletion Multimedia session D1, UE will be included in the handoff request by the descriptor of deletion medium and send to SC AS through second Access Network; Comprise in the said descriptor and be used to identify second identification information that corresponding medium are deleted;
After receiving said handoff request, SC AS if exist, then notifies the remote subscriber deletion corresponding medium according to whether comprising the medium whether said second identification information judgment exists the said Multimedia session D1 that is deleted.
In addition, the medium that adopt following method sign to be deleted: the media port parameter value by in the descriptor of deletion medium is set to negative, or in by the descriptor of deletion medium, increases delete flag.
In sum, adopt maintenance switching method for multimedia session continuity of the present invention, make SC AS can in time know the session that whether need be released in former Access Network, saved Session Resources, and overcome the problem of wrong release.
Description of drawings
Fig. 1 is that existing employing MMSC technology is carried out the method flow diagram that Multimedia session switches;
Fig. 2 is that SDP describes sketch map in the SIP conversation request;
Fig. 3 is the present invention's first application example flow chart;
Fig. 4 is the present invention's second application example flow chart.
Embodiment
As shown in Figure 2, in the SIP conversation request, adopt Session Description Protocol (Session DescriptionProtocol) that medium are described.For each medium in the session, have the media description information of following form:
M=(media name, transport address (port parameter that wherein comprises medium)), this row is essential;
I=
*(media streams), this row is optional;
C=
*(link information), this row is optional;
B=
*(0 or multirow bandwidth information), this row is optional;
K=
*(key), this row is optional;
A=
*(0 or multirow medium property capable), this row is optional;
In the SIP conversation request, all have above-mentioned media description information capable for each medium, wherein the order between row and the row can not be put upside down.In the time of a plurality of medium,, list the descriptor of each medium respectively according to the medium order.
Main thought of the present invention is, UE adopts one of following rule for media description information in handoff request (being UE at called number that new Access Network is initiated for switching the conversation request of sign):
Media description rule one:
1, the media description in handoff request partly comprises the descriptor of all medium that after switching, still exist, comprising the descriptor of the medium that carry on the new Access Network, and the descriptor of the medium that keep on the former Access Network; And
2,, adopt normal describing mode for the medium on the new Access Network; And for the medium that keep on the former Access Network, in handoff request, it is designated and closes (it is designated need be retained in the former Access Network in other words), for example, can be set to 0 through the media port parameter value and it is designated closes.
Media description rule two:
1, the media description in handoff request partly comprises the descriptor that all switch preceding medium; Comprising: the descriptor that is carried on the medium on the new Access Network after the switching; And the descriptor that is retained in the medium of former Access Network, and the descriptor of the medium that need be deleted; And
2, at the medium that are carried on after the switching on the new Access Network, adopt normal describing mode; For the medium that are retained in former Access Network, in handoff request, it is designated and closes; For by the medium deleted, in handoff request, be set to negative, or increase mode such as delete flag it is designated deletion through the media port parameter value.
Adopt above-mentioned media description rule, after SC AS receives handoff request, just know whether have medium to be retained in the former Access Network according to the media information in this request; And when not having medium to be retained in former Access Network, SC AS can directly discharge the session on the former Access Network.
For example, UE-1 and remote subscriber comprise 4 medium in the Multimedia session D1 that Access Network A sets up, and note is made M1, M2, M3, M4 respectively; When switching to Access Network B:
1), all the other medium are deleted if medium M1 and M2 are switched to Access Network B:
When adopting the media description rule for the moment, the media description part of UE-1 in handoff request only comprises the normal descriptor of medium M1 and M2; Like this, SC AS just knows do not have session to need to keep among the Access Network A after receiving handoff request, and the remote subscriber that therefore can notify Multimedia session D1 is with medium M3, M4 deletion;
When adopting media description rule two; UE-1 partly comprises whole medium (descriptor of medium M1～M4) at the media description of handoff request; Wherein medium M1 and M2 are normal media description information; And medium M3 and M4 are designated deletion, same, SC AS just knows do not have session to need to keep among the Access Network A after receiving handoff request.
2) if medium M1 and M2 are switched to Access Network B, all the other medium are retained in Access Network A:
When adopting the medium rule for the moment, the media description of UE-1 in handoff request partly comprises whole medium (descriptor of medium M1～M4); Wherein medium M1 and M2 are normal media description information; And, can adopt the media port parameter value to be set to 0 method representation and will it be retained in Access Network A for medium M3 and M4; Like this, SC AS just knows that medium M3 and M4 are retained among the Access Network A after receiving handoff request;
When adopting medium rule two, UE-1 comprises whole medium (descriptor of medium M1～M4) in handoff request; Wherein medium M1 and M2 are normal media description information, close and medium M3 and M4 be designated.
3),, medium M4 is retained among the Access Network A medium M3 deletion if medium M1 and M2 are switched to Access Network B:
When adopting the media description rule for the moment, the media description of UE-1 in handoff request partly comprises the descriptor of medium M1, M2 and M4; Wherein medium M1 and M2 are normal media description information; For medium M4, media port parameter value that can its descriptor is set to 0 method and representes it is retained among the Access Network A; Like this, SC AS just knows that medium M4 is retained among the Access Network A after receiving handoff request;
When adopting media description rule two; The media description of UE-1 in handoff request partly comprises whole medium (descriptor of medium M1～M4); Wherein medium M1 and M2 are normal media description information, medium M4 is designated closes, and M3 is designated deletion with medium.
4) if medium M1, M2, M3 and M4 are all switched to Access Network B:
When adopting the media description rule for the moment, UE-1 partly comprises whole medium (normal descriptor of medium M1～M4) at the media description of handoff request; SC AS just receives after the handoff request and knows that all medium all switch among the Access Network B (record when SC AS can set up according to session know session only use this 4 medium) like this;
When adopting media description rule two, UE-1 partly comprises whole medium (normal descriptor of medium M1～M4) at the media description of handoff request; Equally, SC AS just knows that all medium all switch among the Access Network B after receiving handoff request.
To combine accompanying drawing and embodiment to describe the present invention below.
First application example
Fig. 3 is the present invention's first application example flow chart; Should use in the instance, UE and remote subscriber have been set up Multimedia session D1 in the PS1 territory, when switching to new Access Network (PS2 territory), the part of media of Multimedia session D1 are switched to new Access Network, and all the other medium are all deleted.Handoff procedure may further comprise the steps:
301) for a certain reason, the Multimedia session D1 that UE decision will have been set up switches to the PS territory of new Access Network by the PS1 territory, i.e. PS2 territory, and the medium that can not switch are all deleted; UE initiates the SIP conversation request at new Access Network (PS2 territory), has carried STI in this request to show that this is that Multimedia session D1 is switched; This request is sent to the CSCF of home network;
In addition, only comprise the information of switching the medium of coming, do not comprise the information (media description regular) that not have to switch the medium (i.e. the medium of deletion) of coming in the media description of above-mentioned SIP conversation request (being handoff request) part; Perhaps the media description in this conversation request partly comprises the information of the medium that switch to the PS2 territory, and the information (media description rule two) of being deleted medium.
302) S-CSCF perhaps according to STI, transmits above-mentioned SIP conversation request to SC AS according to initial filter standard or norm (initial Filter Criteria is called for short iFC);
303) after SC AS receives above-mentioned SIP conversation request, know that according to STI this is the request that session D1 is switched, and SC AS knows the media information that switches to the PS2 territory according to the media description information of this session, and know that all the other medium are deleted; SC AS upgrades the corresponding session with remote subscriber;
304) foundation of SC CS completion and UE session on new Access Network;
305) after switching was accomplished, SC AS discharged the session of asking to discharge former Access Network through sending session, and CSCF is at first issued in this request;
306) CSCF discharges above-mentioned session and asks to be transmitted to UE, and the session of former Access Network is deleted.
Second application example
Fig. 4 is the present invention's second application example flow chart; Should use in the instance; UE and remote subscriber have been set up Multimedia session D1 in the PS1 territory, when switching to new Access Network (PS2 territory), the part of media of Multimedia session D1 are switched to new Access Network; Part in all the other medium is retained in former Access Network (PS1 territory), and another part is deleted.Handoff procedure may further comprise the steps:
401) for a certain reason, the Multimedia session D1 that UE decision will have been set up switches to the PS territory of new Access Network, i.e. PS2 territory by the PS1 territory; Wherein the part of media among the Multimedia session D1 switches to the PS2 territory, and the medium that can not switch are retained in former Access Network (PS1 territory) by part, and all the other are deleted; UE initiates a session request at new Access Network (PS2 territory), has carried STI in this request to show that this is that Multimedia session D1 is switched; This request is sent to the CSCF of home network;
In addition; Media description in above-mentioned SIP conversation request (being handoff request) has partly comprised the information (normal media description) of switching the medium of coming; And the descriptor (these medium are identified as and close, and for example the transmit port parameter value is set to 0) that still is retained in the medium of former Access Network (PS1 territory).For the medium of being deleted, can not comprise corresponding media description information (media description rule one), perhaps in the media description information of correspondence, this media identification is deleted (media description rule two).
402) CSCF perhaps according to STI, transmits above-mentioned SIP conversation request to SC AS according to initial filter standard or norm (initial Filter Criteria is called for short iFC);
403) after SC AS receives above-mentioned SIP conversation request; Know that according to STI needs switch Multimedia session D1; And according to the media description information that comprises in this conversation request; Know that some medium switches to new Access Network (PS2 territory), some medium is retained in old Access Network (PS1 territory), also has some medium to be deleted; Therefore, SC AS upgrades the corresponding session with remote subscriber, the corresponding medium of notice remote subscriber deletion;
404) SC AS accomplishes the foundation of going up session with UE at new Access Network (PS2 territory);
405) UE upgrades request accomplishing after the switching in PS2 territory in old Access Network (PS1 territory) initiation session, and this request is sent to CSCF;
406) CSCF is transmitted to SC AS with above-mentioned session updates request;
407) after SC AS receives above-mentioned session updates request, upgrade corresponding session with remote subscriber.
According to basic principle of the present invention, the foregoing description can also have multiple mapping mode, and for example: UE also can increase a field or parameter value newly in handoff request, is used to notify the SC AS need be at former Access Network reserve part medium when switching.
Claims (10)
1. one kind keeps switching method for multimedia session continuity, it is characterized in that,
User terminal UE is after first Access Network and remote subscriber are set up Multimedia session D1; When switching to second Access Network and the part of media of Multimedia session D1 is retained in first Access Network, UE sends the handoff request that comprises first identification information at second Access Network; Said first identification information is used to identify the part of media that need keep Multimedia session D1 at first Access Network; Said first Access Network is packet switching PS1 territory, and second Access Network is packet switching PS2 territory;
After receiving said handoff request; Whether whether business continuance application server SC AS basis comprises said first identification information judgment exists needs to be retained in the medium of the Multimedia session D1 of first Access Network: if do not exist; Then successfully setting up on second Access Network after the corresponding session with UE, SC AS discharges the Multimedia session D1 on first Access Network.
2. the method for claim 1 is characterized in that, adopts following method sign in said handoff request to need to keep the part of media of Multimedia session D1:
Media description in said handoff request partly comprises the descriptor of the medium that need be retained in first Access Network, and in each descriptor with the media identification of correspondence for need be retained in first Access Network.
3. method as claimed in claim 2 is characterized in that, adopts following method sign in descriptor need be retained in the medium of first Access Network:
The media port parameter value that needs are retained in the descriptor of medium of first Access Network is set to 0.
4. like the described method of arbitrary claim in the claim 1 to 3, it is characterized in that SC AS discharges the said Multimedia session D1 of request release through send session to said UE.
5. like the described method of arbitrary claim in the claim 1 to 3, it is characterized in that,
Said UE when switching to second Access Network and need the part of media of deletion Multimedia session D1, will be included in by the descriptor of deletion medium and send to SC AS in the said handoff request after first Access Network is set up said Multimedia session D1; Comprise in the said descriptor and be used to identify second identification information that corresponding medium are deleted;
After receiving said handoff request, SC AS if exist, then notifies the remote subscriber deletion corresponding medium according to whether comprising the medium whether said second identification information judgment exists the said Multimedia session D1 that is deleted.
6. method as claimed in claim 5 is characterized in that,
The medium that adopt following method sign to be deleted: the media port parameter value by in the descriptor of deletion medium is set to negative.
7. method as claimed in claim 5 is characterized in that,
The medium that adopt following method sign to be deleted: in by the descriptor of deletion medium, increase delete flag.
8. the method for claim 1 is characterized in that,
Said UE when switching to second Access Network and need the part of media of deletion Multimedia session D1, will be included in the said handoff request by the descriptor of deletion medium after first Access Network is set up said Multimedia session D1;
After receiving said handoff request, SC AS will not be included in the medium deletion of the Multimedia session D1 in the said handoff request.
9. one kind keeps switching method for multimedia session continuity, it is characterized in that,
User terminal UE is after first Access Network and remote subscriber are set up Multimedia session D1; When switching to second Access Network and need the part of media of deletion Multimedia session D1, UE will be included in the handoff request by the descriptor of deletion medium and send to business continuance application server SC AS through second Access Network; Comprise in the said descriptor and be used to identify second identification information that corresponding medium are deleted; Said first Access Network is packet switching PS1 territory, and second Access Network is packet switching PS2 territory;
After receiving said handoff request, SC AS if exist, then notifies the remote subscriber deletion corresponding medium according to whether comprising the medium whether said second identification information judgment exists the said Multimedia session D1 that is deleted.
10. method as claimed in claim 9 is characterized in that,
The medium that adopt following method sign to be deleted: the media port parameter value by in the descriptor of deletion medium is set to negative, or in by the descriptor of deletion medium, increases delete flag.
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| CN104767751A (en) * | 2015-04-02 | 2015-07-08 | 大唐移动通信设备有限公司 | Session control method and device |
| CN112218288B (en) * | 2019-07-12 | 2022-04-12 | 华为技术有限公司 | Communication method and device |
| CN112911656A (en) * | 2019-12-04 | 2021-06-04 | 中国电信股份有限公司 | Service concurrency method, device, system and storage medium |
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| CN101217788A (en) * | 2008-01-08 | 2008-07-09 | 中兴通讯股份有限公司 | A calling method to start a successive operation of multimedia conversation |
| CN101227647A (en) * | 2008-02-05 | 2008-07-23 | 中兴通讯股份有限公司 | Switching method of keeping multimedia conversation continuity business |
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| CN101217788A (en) * | 2008-01-08 | 2008-07-09 | 中兴通讯股份有限公司 | A calling method to start a successive operation of multimedia conversation |
| CN101227647A (en) * | 2008-02-05 | 2008-07-23 | 中兴通讯股份有限公司 | Switching method of keeping multimedia conversation continuity business |
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