CN102006269A - Synchronization method and system for multi-session capability of IP multimedia subsystem - Google Patents
Synchronization method and system for multi-session capability of IP multimedia subsystem Download PDFInfo
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- H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
- H04L65/10—Architectures or entities
- H04L65/1016—IP multimedia subsystem [IMS]
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- H—ELECTRICITY
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- H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
- H04L65/1066—Session management
- H04L65/1083—In-session procedures
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
- H04L65/1066—Session management
- H04L65/1083—In-session procedures
- H04L65/1095—Inter-network session transfer or sharing
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- H—ELECTRICITY
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Abstract
The invention discloses a synchronization method and system for multi-session capability of an IP multimedia subsystem, which enable user equipment (UE) to sense network capability and avoid conversion operation failure. The method comprises the following steps of: in the conversion process of the UE from a packet switching (PS) domain to a circuit switching (CS) domain, sending self multi-session transferring capability information to the UE after a mobile switching center (MSC) or an enhanced-mobile switching center (E-MSC) receives session transferring request messages; and conducting relative processing according to the multi-session transferring capability of the MSC or the E-MSC after the UE receives the multi-session transferring capability information of the MSC or the E-MSC.
Description
Technical field
The present invention relates to the communications field, relate in particular to a kind of many session abilities of IP Multimedia System method for synchronous and system.
Background technology
IP (Internet Protocol, network interconnection agreement) multimedia subsystem, IMS (IP Multimedia Core Network Subsystem) is a kind of IP-based network framework that is proposed by third generation partner program 3GPP (3rd Generation Partnership Project), it has made up an opening and service environment flexibly, support multimedia application, and provide 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.
Many sessions are shifted and are referred to here in the IMS territory, user terminal (UE) is directly set up session with a plurality of users, there are session and a plurality of hold mode session of an activation in these sessions, when user terminal UE because network communication quality or other factors, transfer to circuit switching (Circuit Switch, be called for short CS) territory, and session is not interrupted, and continues to keep the technology of many session connections.
Fig. 1 is the system reference framework that the many sessions of IMS are shifted.Whole framework comprises subscriber equipment (User Equipment, be called for short UE) 101, (the Mobile Switch Center of mobile switching centre, be called for short MSC) 102, MGCF (Media Gateway Control Function, be called for short MGCF) 103, media gateway (Media Gateway, be called for short MGW) 104, Proxy Call Session Control Function (Proxy Call Session Control Function, be called for short P-CSCF) 105, query call conversation control function (Interrogating Call Session Control Function, be called for short I-CSCF) 106, home subscriber server (Home Subscriber Server, be called for short HSS) 107, service call conversation control function (Serving Call Session Control Function, be called for short S-CSCF) 108, business continuance application server (Service Continuity Application Server is called for short SC AS) 109.
Wherein SC AS 109 provides and comprises multimedia service continuous server, multimedia service server etc., can be the user services such as multimedia service continuity, multimedia service are provided.
Fig. 2 is many sessions of prior art IMS transfer service flow chart.UE-1 is at packet switching (Packet Switch, abbreviation PS) there are voice conversation simultaneously in territory and UE-2 and two terminals of UE-3, wherein UE-1 and UE-3 are in state of activation, UE-1 and UE-4 are in hold mode, at this time, UE-1 is because move and need transfer to circuit domain to many sessions, and idiographic flow is as follows:
201, IMS is in the process that session is set up, and SC AS and UE distribute a Transaction Identifier (Transaction Identifier is called for short TI) for each session;
202, there are a plurality of sessions in UE-1, and UE checks need transfer to the CS territory, and UE sets up the bearer path request to the purpose network, at first shifts the session that activates;
203, UE-1 initiates normal call establishment at the CS network, sends setup requests, the called number in the Setup message be set to the UE static configuration the session forwarding number (Session Transfer Number, STN);
204, MSC receives setup requests Setup message, according to the session initiation protocol between STN foundation and the SC AS (Session Initial Protocol is called for short SIP) session; Perhaps trigger caller Camel flow process and obtain the roaming number IMRN of SC AS, and according to the SIP session of IMRN foundation with AS;
205, SC AS receives 204 session foundation request, upgrades the media session access address that far-end activates;
206, initiate heavily to invite request to far-end active side far-end UE2, change distant end media access address;
207, session is replied;
208, SC AS brings MSC many session informations in response message, wherein comprises the corresponding relation that sign STI (Session Transfer Identifier) and TI are shifted in session, and session status.
209, after MSC receives 208 response messages, send connection message to UE-1;
210, SC AS notice UE discharges session of original PS side and carrying;
211-214, MSC receive 208 response message, if check and to have many sessions, adopt in the response message STI, the session of setting up hold mode to SC AS.The TI information that preservation is obtained, and related TI and session;
When 215, the UE-1 initiation kept former active session, UE-1 sent to MSC and keeps message, carries the TI that needs maintenance;
216-219, MSC be according to keeping the TI in the message to find the session that is associated, and upgrade local terminal and far-end conversation media state is Inactive (non-activation);
220, after MSC receives and upgrades media answer message, send hold acknowledge message to UE-1;
221, UE-1 need activate original maintained TI2 session, and UE-1 sends to MSC and activates message, comprises TI2 in the message;
222-225, MSC be according to keeping the TI2 in the message to find the session that is associated, and upgrade local terminal and far-end conversation media state is Active (activation).
According to process analysis described above, prior art, under the situation of many sessions, SC brings MSC many session informations, and there are the following problems:
If the user roams into a MSC Server compass of competency of not supporting many sessions transfer ability, as 208 steps, MSC Server can't receive many session informations, also can't carry out the 211-214 step.And UE can't know that at this time MSC Server shifts failure, also thinks and has shifted success, as initiate 215 and 221 steps, will cause operation failure, reduces the user experience impression.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of many session abilities of IP Multimedia System method for synchronous and system, makes the UE can the sensing network ability, avoids the handover operation failure.
For solving the problems of the technologies described above, the invention provides a kind of many session abilities of IP Multimedia System method for synchronous, described method comprises:
Switch to the process in circuit switching (CS) territory from packet switching (PS) territory at subscriber equipment (UE), when mobile switching centre (MSC) or strengthen after mobile switching centre (E-MSC) receives session transfer request message, the many sessions transfer ability information of oneself is passed to described UE, after described UE receives many sessions transfer ability information of MSC or E-MSC, many sessions transfer ability according to MSC or E-MSC carries out respective handling.
Further, described respective handling comprises a kind of in the following operation: many sessions are switched to the CS territory, keep many session status; Only switch active session to the CS territory, discharge non-active session; Only switch active session to the CS territory, keep non-active session in the PS territory.
Further, described UE is according to many sessions transfer ability of MSC or E-MSC, and the step of selection operation further comprises: support many sessions to shift if described UE judges MSC or E-MSC, then many sessions are switched to the CS territory, keep many session status; If described UE judges MSC or E-MSC and does not support many sessions to shift, then only switch active session to the CS territory, discharge non-active session or keep non-active session in the PS territory.
Further, described session transfer request message is the call setup request message that UE initiates in circuit domain, or the handoff request message of MME transmission.
Further, described session transfer request message is that UE is when the call setup request message that circuit domain is initiated, after described MSC or E-MSC receive call setup request message, many sessions transfer ability information of described MSC or E-MSC is passed to described UE by notification message.
Further, described notification message is the call setup response message or is exclusively used in the message that sends many sessions transfer ability information.
Further, when described session transfer request message is the handoff request message of MME transmission, after described MSC or E-MSC receive handoff request message, whether will support the information of many sessions transfer ability to pass to MME by handover acknowledge message, whether described MME supports the information of many sessions transfer ability to pass to UE MSC or E-MSC by switching command.
Further, described many sessions transfer ability information from E-MSC to UE that transmit MSC or in the following ways: when MSC or E-MSC support that many sessions are shifted, carry the indication of supporting many sessions transfer ability in message; When MSC or E-MSC do not support that many sessions are shifted, in message, carry the indication of not supporting many sessions transfer ability, perhaps in message, do not carry the indication of supporting many sessions transfer ability.
For solving the problems of the technologies described above, the invention provides a kind of many session abilities of IP Multimedia System synchro system, be applicable to the business continuance scene, described system comprises mobile switching centre (MSC) and subscriber equipment (UE), wherein:
Described MSC is used for switching to from packet switching (PS) territory at UE the process in circuit switching (CS) territory, and after receiving session transfer request message, the many sessions transfer ability information with oneself in session transfer acknowledge message passes to described UE;
Described UE after being used for knowing many sessions transfer ability of MSC by session transfer acknowledge message, according to many sessions transfer ability of MSC, selects following operation: many sessions are switched to the CS territory, keep many session status; Perhaps only switch active session to the CS territory, discharge non-active session; Perhaps only switch active session to the CS territory, keep non-active session in the PS territory.
For solving the problems of the technologies described above, the invention provides a kind of many session abilities of IP Multimedia System synchro system, be applicable to single channel voice business continuity scene, described system comprises enhancing mobile switching centre (E-MSC), Mobility Management Entity (MME) and subscriber equipment (UE), wherein:
Described E-MSC is used for switching to from packet switching (PS) territory at UE the process in circuit switching (CS) territory, after receiving session transfer request message, oneself many sessions transfer ability information is passed to MME;
Whether described MME is used for supporting the information of many sessions transfer ability to pass to UE E-MSC by switching command;
Described UE is used for after knowing many sessions transfer ability of MSC, according to many sessions transfer ability of MSC, selects following operation: many sessions are switched to the CS territory, keep many session status; Perhaps only switch active session to the CS territory, discharge non-active session.
The invention provides many sessions tenability simultaneous techniques between a kind of MSC Server and UE, when the many sessions of user are switched, sensing network ability at any time, and make corresponding adjustment.
Description of drawings
Fig. 1 is an IMS centralized traffic system reference Organization Chart;
Fig. 2 is many sessions of prior art IMS transfer service flow chart;
Fig. 3 is in many sessions of present embodiment business continuance scene IMS transfer process, and MSC Server supports many sessions to shift the flow chart of scene;
Fig. 4 is in many sessions of present embodiment business continuance scene IMS transfer process, and MSC Server does not support many sessions to shift, and keeps session to be retained in the flow chart of former PS network scenarios;
Fig. 5 is in many sessions of present embodiment business continuance scene IMS transfer process, and MSC Server does not support many sessions to shift, and discharges the flow chart of non-active session scene;
Fig. 6 is many sessions of single channel voice business continuity (SRVCC) switched system reference diagram;
Fig. 7 is that the flow chart when E-MSC supports many sessions switching capability is switched in the many sessions of single channel voice business continuity;
Fig. 8 is that the flow chart when E-MSC does not support many sessions switching capability is switched in the many sessions of single channel voice business continuity.
Embodiment
Because thereby UE and MSC Server are inconsistent to asynchronous UE and the MSC Server call state of causing of many sessions transfer ability perception, the experience problem that lowered the user, therefore, inventive concept of the present invention is: switch to the process in CS territory from the PS territory at UE, after MSC or E-MSC receive session transfer request message, the many sessions transfer ability information of oneself is passed to described UE, after described UE receives many sessions transfer ability information of MSC or E-MSC, many sessions transfer ability according to MSC or E-MSC carries out respective handling.
After described UE is known many sessions transfer ability of MSC or E-MSC,, select following operation: many sessions are switched to the CS territory, keep many session status according to many sessions transfer ability of MSC or E-MSC; Perhaps only switch active session to the CS territory, discharge non-active session; Perhaps only switch active session to the CS territory, keep non-active session in the PS territory.
Further, support many sessions to shift, then many sessions are switched to the CS territory, keep many session status if UE judges MSC or E-MSC; Otherwise UE only switches active session to the CS territory, discharges non-active session or keeps non-active session in former PS territory.
Above-mentioned session transfer request message is the handoff request message that UE sends at the call setup request message or the MME of circuit domain initiation.
Described session transfer request message is UE when the call setup request message that circuit domain is initiated, and after described MSC or E-MSC receive call setup request message, by notification message described oneself many sessions transfer ability is passed to described UE.
Described notification message can be the setup requests response message or be exclusively used in the message that sends many sessions transfer ability information, for example install message.
When described session transfer request message is the handoff request message of MME transmission, after described MSC or E-MSC receive handoff request message, to support the indication of many sessions transfer ability to send to MME by handover acknowledge message, described MME supports the indication of many sessions transfer ability to send to UE MSC or E-MSC by switching command.
Many sessions transfer ability information from E-MSC to UE that transmit MSC or is in the following ways:
When MSC or E-MSC support that many sessions are shifted, in message, carry the indication of supporting many sessions transfer ability;
When MSC or E-MSC do not support that many sessions are shifted, in message, carry the indication of not supporting many sessions transfer ability, perhaps in message, do not carry the indication of supporting many sessions transfer ability.
For business continuance (SC) scene, realize that system for carrying out said process comprises MSC and UE, wherein:
Described MSC is used for switching to from the PS territory at UE the process in CS territory, and after receiving session transfer request message, the many sessions transfer ability information with oneself in session transfer acknowledge message passes to described UE;
Described UE after being used for knowing many sessions transfer ability of MSC by session transfer acknowledge message, according to many sessions transfer ability of MSC, selects following operation: many sessions are switched to the CS territory, keep many session status; Perhaps only switch active session to the CS territory, discharge non-active session; Perhaps only switch active session to the CS territory, keep non-active session in the PS territory.
For single channel voice business continuity (SRVCC) scene, realize that the said method system comprises enhancing mobile switching centre (E-MSC), Mobility Management Entity (MME) and subscriber equipment (UE), wherein:
Described E-MSC is used for switching to from the PS territory at UE the process in CS territory, after receiving session transfer request message, oneself many sessions transfer ability information is passed to MME;
Whether described MME is used for supporting the information of many sessions transfer ability to pass to UE E-MSC by switching command;
Described UE is used for after knowing many sessions transfer ability of MSC, according to many sessions transfer ability of MSC, selects following operation: many sessions are switched to the CS territory, keep many session status; Perhaps only switch active session to the CS territory, discharge non-active session.
Below in conjunction with drawings and Examples technical scheme of the present invention is described in detail.
Fig. 3 is in many sessions of present embodiment IMS transfer process, MSC Server supports many sessions to shift scene, when MSC Server receives the setup requests that UE sends, in the request message, called number is static STN, MSC Server supports MSC Server many sessions index strip to give UE in call answering message, and UE shifts the indication decision according to many sessions in the call answering message and whether keeps many session status;
301, IMS is in the process that session is set up, and SC AS and UE distribute a Transaction Identifier (Transaction Identifier is called for short TI) for each session;
302, there are a plurality of sessions in UE, and UE checks need transfer to the CS territory, and UE sets up the bearer path request to the purpose network, at first shifts the session that activates;
303, UE initiates normal call establishment at the CS network, the called number in the Setup message be set to the UE static configuration the session forwarding number (Session Transfer Number, STN);
304, MSC Server receives the UE setup requests, and when returning call answering (being the setup requests response message), if MSC Server supports many sessions to shift, MSC Server gives UE many sessions transfer ability index strip of supporting;
MSC Sever also can send to terminal in other indications that is exclusively used in the message that sends the indication of many sessions transfer ability many sessions transfer ability, for example installs message.
305, UE receives response message, judges that whether core net supports many sessions to shift, if support, keeps many session status;
306, MSC Server receives setup requests Setup message, according to the session initiation protocol between STN foundation and the SC AS (Session Initial Protocol is called for short SIP) session; Perhaps trigger caller Camel flow process and obtain the roaming number IMRN of SC AS, and according to the SIP session of IMRN foundation with AS;
307, SC AS receives 306 session foundation request, upgrades the media session access address that far-end activates;
308, initiate heavily to invite request to far-end active side far-end UE2, change distant end media access address;
309, session is replied;
310, SC AS brings MSC server many session informations in response message, wherein comprises the corresponding relation that sign STI (Session Transfer Identifier) and TI are shifted in session, and session status;
311, after MSC receives 310 response messages, send connection message to UE-1;
312, SC AS notice UE discharges the session of original PS side;
313-316, MSC receive 310 response message, if check and to have many sessions, adopt in the response message STI, the session of setting up hold mode to SC AS.The TI information that preservation is obtained, and related TI and session;
317, UE-1 carries out the session handover operation by TI.
Fig. 4 is in many sessions of present embodiment IMS transfer process, and MSC Server does not support many sessions to shift, and keeps session to be retained in former PS network scenarios, compares with Fig. 3 embodiment, and main MSC Sever does not support many sessions to shift, and the session that the UE reservation keeps is on former PS;
401, IMS is in the process that session is set up, and SC AS and UE distribute a Transaction Identifier (Transaction Identifier is called for short TI) for each session;
402, there are a plurality of sessions in UE, and UE checks need transfer to the CS territory, and UE sets up the bearer path request to the purpose network, at first shifts the session that activates;
403, UE initiates normal call establishment at the CS network, the called number in the Setup message be set to the UE static configuration the session forwarding number (Session Transfer Number, STN);
404, MSC Server receives the UE setup requests, when returning call answering (being the setup requests response message), if MSC Server does not support many sessions to shift, MSC Server is not supporting many sessions transfer ability index strip to give UE or not giving UE many sessions transfer ability index strip;
MSC Sever also can send to terminal in other indications that is exclusively used in the message that sends the indication of many sessions transfer ability many sessions transfer ability, for example installs message.
405, UE receives response message, judges whether core net supports many sessions to shift, if do not carry indication in the message or the indication of many sessions transfer ability is not supported, active session is switched to circuit domain, and the maintenance session is retained in former PS territory;
406, MSC Server receives setup requests Setup message, according to the session initiation protocol between STN foundation and the SC AS (Session Initial Protocol is called for short SIP) session; Perhaps trigger caller Camel flow process and obtain the roaming number IMRN of SC AS, and according to the SIP session of IMRN foundation with AS;
407, SC AS receives 306 session foundation request, upgrades the media session access address that far-end activates;
408, initiate heavily to invite request to far-end active side far-end UE2, change distant end media access address;
409, session is replied;
410, SC AS returns session response message to MSC Server, does not carry many session informations;
411, after MSC receives 410 response messages, send connection message to UE-1;
412, SC AS notice UE upgrades the session of original PS side;
413, UE-1 carries out the session handover operation between packet domain and circuit domain
Fig. 5 is in many sessions of present embodiment IMS transfer process, and MSC Server does not support many sessions to shift, and discharges non-active session scene, compares with Fig. 4 embodiment, and main MSC Sever does not support many sessions to shift, and UE discharges the session that keeps;
501, IMS is in the process that session is set up, and SC AS and UE distribute a Transaction Identifier (Transaction Identifier is called for short TI) for each session;
502, there are a plurality of sessions in UE, and UE checks need transfer to the CS territory, and UE sets up the bearer path request to the purpose network, at first shifts the session that activates;
503, UE initiates normal call establishment at the CS network, the called number in the Setup message be set to the UE static configuration the session forwarding number (Session Transfer Number, STN);
504, MSC Server receives the UE setup requests, when returning call answering (being the setup requests response message), if MSC Server does not support many sessions to shift, MSC Server is not supporting many sessions transfer ability index strip to give UE or not giving UE many sessions transfer ability index strip;
MSC Sever also can send to terminal in other indications that is exclusively used in the message that sends the indication of many sessions transfer ability many sessions transfer ability, for example installs message.
505, UE receives response message, judges whether core net supports many sessions to shift, if do not support, only active session is switched to circuit domain, cancels the session that many session status promptly discharge maintenance;
506, MSC Server receives setup requests Setup message, according to the session initiation protocol between STN foundation and the SC AS (Session Initial Protocol is called for short SIP) session; Perhaps trigger caller Camel flow process and obtain the roaming number IMRN of SC AS, and according to the SIP session of IMRN foundation with AS;
507, SC AS receives 506 session foundation request, upgrades the media session access address that far-end activates;
508, initiate heavily to invite request to far-end active side far-end UE2, change distant end media access address;
509, session is replied;
510, SC AS returns session response message to MSC Server, does not carry many session informations;
511, after MSC receives 510 response messages, send connection message to UE-1;
512, SC AS notice UE discharges the session of original PS side;
Fig. 6 is many sessions of single channel voice business continuity (SRVCC) switched system reference diagram:
The global system for mobile communications wireless access network of E-UTRAN evolution (Evolved Universal Mobile Telecommunication System Radio Access Network, E-UTRAN), the wireless access network of evolution, can provide higher up-downgoing speed, lower transmission delay and reliable more wireless transmission.The network element that comprises among the E-UTRAN is eNodeB (Evolved NodeB), for the access of terminal provides Radio Resource.
Mobility Management Entity (Mobility Management Entity, be called for short MME), it is a chain of command entity, the server of interim storaging user data, be in charge of and store UE context (such as UE/ user ID, mobility management states, user security parameters etc.), for the user distributes temporary mark, when quartering at this tracing area or this network, is responsible for UE this user is carried out authentication.
Gateway (Serving Gateway is called for short S-GW) is a user entity, is responsible for the user face data route and handles.
Packet data network gateway (Packet Data Network Gateway is called for short PDN GW or P-GW) is responsible for the gateway function that UE inserts PDN (Packet Data Network, Packet Data Network).P-GW and S-GW may close and be located in the physical entity.
(Enhanced MSC Server E-MSC), is responsible for the control of circuit domain business and exchange of media to strengthen mobile switching centre.Here be mainly used in switching, the Sv mouth between support and MME.
Embodiment 4
Fig. 7 is that the many sessions of single channel voice business continuity (SRVCC) are switched, E-MSC supports many sessions switching capability, receive the handoff request of MME as MSC Server, if E-MSC supports many sessions transfer ability, E-MSC indicates the many session abilities of support in returning handover acknowledge message, bring UE by switching command, UE judges whether to keep many session status according to the tenability of the many sessions in the switching command;
701, as step 301 and 401;
The wireless quality report that 702-703, E-UTRAN report according to UE, decision need switch to calling the UTRAN network of adjacency, send handoff request to MME, MME selects E-MSC, transmit switching message to E-MSC, carry the STN number that source location information and target position information and MME obtain in the message when the user registers;
704, E-MSC receives switching message, according to the Target cell that switches in the message, selects Target MSC to carry out inter-office switchover;
705-706, Target MSC send request to target UTRAN, assign base station land circuit and interface-free resources, have assigned, and target UTRAN returns handover acknowledge;
707, Target MSC receives base station handover acknowledge message, distributes Handover Number, returns handover acknowledge message to E-MSC;
708, E-MSC receives handover acknowledge, sets up circuit carrying according to Handover Number to Target MSC, judges whether E-MSC supports many sessions, if support, carries many sessions transfer ability in the handover acknowledge message and indicates returning to MME;
709, MME receives handover acknowledge message, sends switching command to UE, and notice UE switches, and carries the indication that E-MSC supports many sessions transfer ability in the message;
710, UE receives switching command, and access is switched to objective network, judges whether core net supports many sessions to shift in the switching command, if support, then keeps many session status on UE, and many sessions are all switched to the CS territory;
711, synchronous with 708, the STN that E-MSC passes by on one's way according to 703 step bands sends session invitation message to the SC AS of ground, user home to return to IMS network, carries E-MSC and supports many sessions transfer ability support indication, calling number, called number is STN, and notice home to return to network switches;
712-714, UE switch to the objective network success, and informing network switches to be finished;
715-716, SC AS receive session invitation, according to the calling number in the message, if judge that there are a plurality of callings in this user, switch the session of state of activation, send the heavy invitation message of session to far-end UE, upgrade distant end media;
717, SC AS supports the indication of many sessions transfer ability according to 711 step e-MSC, SC AS brings MSC server many session informations in response message, wherein comprise session and shift the corresponding relation of sign STI (Session Transfer Identifier) and TI, and session status.
718-719, E-MSC set up the maintenance session according to many session informations in 717 steps to SC AS;
720, UE-1 carries out the session handover operation by TI.
Embodiment 5
Fig. 8 is that the many sessions of single channel voice business continuity (SRVCC) are switched, E-MSC does not support many sessions switching capability, receive the handoff request of MME as MSC Server, if E-MSC supports many sessions transfer ability, E-MSC in returning handover acknowledge message not supporting the indication of many session abilities, bring UE by switching command, UE judges whether to keep many session status according to the tenability of the many sessions in the switching command;
The same 701-707 of 801-807;
808, E-MSC receives handover acknowledge, set up the circuit carrying according to Handover Number to Target MSC, judge whether E-MSC supports many sessions,, do not support many sessions transfer ability indication or do not carry the indication of many sessions transfer ability returning to MME to carry in the handover acknowledge message if do not support;
809, MME receives handover acknowledge message, sends switching command to UE, and notice UE switches, and carries the indication that E-MSC does not support many sessions transfer ability in the message, does not perhaps carry the indication of many sessions transfer ability;
810, UE receives switching command, and access is switched to objective network, judges whether core net supports many sessions to shift in the switching command, if do not support, only switches active session, cancels many session status;
811, synchronous with 808, the STN that E-MSC passes by on one's way according to 803 step bands sends session invitation message to the SC AS of ground, user home to return to IMS network, carries E-MSC and supports many sessions transfer ability support indication, calling number, called number is STN, and notice home to return to network switches;
812-814, UE switch to the objective network success, and informing network switches to be finished;
815-816, SC AS receive session invitation, according to the calling number in the message, if judge that there are a plurality of callings in this user, switch the session of state of activation, send the heavy invitation message of session to far-end UE, upgrade distant end media;
817, SC AS supports the indication of many sessions transfer ability according to 811 step e-MSC, does not move if E-MSC does not support many sessions to walk around, and SC AS does not bring MSC server many session informations in response message.
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 (10)
1. many session abilities of IP Multimedia System method for synchronous is characterized in that,
Switch to the process in circuit switching (CS) territory from packet switching (PS) territory at subscriber equipment (UE), when mobile switching centre (MSC) or strengthen after mobile switching centre (E-MSC) receives session transfer request message, the many sessions transfer ability information of oneself is passed to described UE, after described UE receives many sessions transfer ability information of MSC or E-MSC, many sessions transfer ability according to MSC or E-MSC carries out respective handling.
2. the method for claim 1 is characterized in that, described respective handling comprises a kind of in the following operation:
Many sessions are switched to the CS territory, keep many session status;
Only switch active session to the CS territory, discharge non-active session;
Only switch active session to the CS territory, keep non-active session in the PS territory.
3. method as claimed in claim 2 is characterized in that,
Described UE is according to many sessions transfer ability of MSC or E-MSC, and the step of selection operation further comprises:
If described UE judges MSC or E-MSC and supports many sessions to shift, then many sessions are switched to the CS territory, keep many session status;
If described UE judges MSC or E-MSC and does not support many sessions to shift, then only switch active session to the CS territory, discharge non-active session or keep non-active session in the PS territory.
4. as claim 1 or 2 or 3 described methods, it is characterized in that,
Described session transfer request message is the call setup request message that UE initiates in circuit domain, or the handoff request message of MME transmission.
5. method as claimed in claim 4 is characterized in that,
Described session transfer request message is UE when the call setup request message that circuit domain is initiated, and after described MSC or E-MSC receive call setup request message, by notification message many sessions transfer ability information of described MSC or E-MSC is passed to described UE.
6. method as claimed in claim 5 is characterized in that,
Described notification message is the call setup response message or is exclusively used in the message that sends many sessions transfer ability information.
7. method as claimed in claim 4 is characterized in that,
When described session transfer request message is the handoff request message of MME transmission, after described MSC or E-MSC receive handoff request message, whether will support the information of many sessions transfer ability to pass to MME by handover acknowledge message, whether described MME supports the information of many sessions transfer ability to pass to UE MSC or E-MSC by switching command.
8. as claim 1 or 2 or 3 or 5 or 6 or 7 described methods, it is characterized in that,
Described many sessions transfer ability information from E-MSC to UE that transmit MSC or is in the following ways:
When MSC or E-MSC support that many sessions are shifted, in message, carry the indication of supporting many sessions transfer ability;
When MSC or E-MSC do not support that many sessions are shifted, in message, carry the indication of not supporting many sessions transfer ability, perhaps in message, do not carry the indication of supporting many sessions transfer ability.
9. many session abilities of IP Multimedia System synchro system is applicable to the business continuance scene, it is characterized in that, comprises mobile switching centre (MSC) and subscriber equipment (UE), wherein:
Described MSC is used for switching to from packet switching (PS) territory at UE the process in circuit switching (CS) territory, and after receiving session transfer request message, the many sessions transfer ability information with oneself in session transfer acknowledge message passes to described UE;
Described UE after being used for knowing many sessions transfer ability of MSC by session transfer acknowledge message, according to many sessions transfer ability of MSC, selects following operation: many sessions are switched to the CS territory, keep many session status; Perhaps only switch active session to the CS territory, discharge non-active session; Perhaps only switch active session to the CS territory, keep non-active session in the PS territory.
10. many session abilities of IP Multimedia System synchro system is applicable to single channel voice business continuity scene, it is characterized in that, comprise strengthening mobile switching centre (E-MSC), Mobility Management Entity (MME) and subscriber equipment (UE), wherein:
Described E-MSC is used for switching to from packet switching (PS) territory at UE the process in circuit switching (CS) territory, after receiving session transfer request message, oneself many sessions transfer ability information is passed to MME;
Whether described MME is used for supporting the information of many sessions transfer ability to pass to UE E-MSC by switching command;
Described UE is used for after knowing many sessions transfer ability of MSC, according to many sessions transfer ability of MSC, selects following operation: many sessions are switched to the CS territory, keep many session status; Perhaps only switch active session to the CS territory, discharge non-active session.
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| CN200910171593.7A CN102006269B (en) | 2009-08-28 | 2009-08-28 | Synchronization method and system for multi-session capability of IP multimedia subsystem |
| PCT/CN2010/075561 WO2011023054A1 (en) | 2009-08-28 | 2010-07-29 | Synchronization method and system for multi-session capability in the ip multimedia core network subsystem |
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Also Published As
| Publication number | Publication date |
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| WO2011023054A1 (en) | 2011-03-03 |
| CN102006269B (en) | 2013-10-16 |
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