CN101835223B - Voice business continuity switching method - Google Patents
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Abstract
The invention relates to a voice business continuity switching method which comprises the following steps: when an IMS (IP Multimedia Subsystem) session of UE (User Equipment) is switched from LTE/SAE (Long Term Evolution/System Architecture Evolution) network access to CS (Circuit Switched) domain access during voice business continuity switching, the UE sends a switching completion message to an enhanced MSC (Mobile Switching Center) through target access equipment of a CS domain; after the switching completion message is received and a domain switching success response sent by an SCC AS is confirmed to be received, the enhanced MSC sends a message used for indicating that the IMS session is switched to the CS domain access to an MME (Mobility Management Entity) completely; after the message sent by the enhanced MSC is received, the MME sends an indicating message used for releasing the carrying resource of the IMS session established in the LTE/SAE network. In conclusion, the voice business continuity switching method solves the problem of switching failure caused by wrong release of the whole session after the MME receives the switching completion message.
Description
Technical field
The present invention relates to the communications field, particularly relate to a kind of voice business continuity switching method.
Background technology
In order to ensure that speech business is at circuit switching (Circuit Switched, be called for short CS) territory and IP (network interconnection agreement, Internet Protocol, be called for short IP) IP multimedia subsystem, IMS (IP Multimedia CoreNetwork Subsystem, be called for short IMS) continuity between territory, solution as shown in Figure 1 for traditional voice business continuity (Voice Call Continuity is called for short VCC).
Wherein, dual-mode user device (User Equipment, be called for short UE) behind CS territory and the equal successful registration of IMS network, when UE initiates speech business in CS territory or IMS network, all anchor to centralized control business and session service application server for continuity (the Service Centralizationand Continuity Application Server of IMS network, be called for short SCC AS) in, now UE has the mark that two SCC AS are known:
1) session switches mark (Session Transfer URI is called for short STI), for representing, user conversation is switched to IMS network at operation layer from CS territory, or switches between packet domain (PS territory);
2) session Handover Number (Session Transfer Number is called for short STN), is switched to CS territory at operation layer from IMS network by user conversation for representing.
When UE prepares a session of having set up to be switched to the access of PS territory from the access of CS territory, or when being switched to the access of another PS territory from a PS territory access, UE carries STI mark in the ims network, initiates a session request to SCC AS; After receiving this session request, this session is switched to IMS network at operation layer from CS territory by SCC AS, or is switched to another PS territory from a PS territory.
When UE has initiated speech business in IMS network, when preparing to be switched to CS territory from IMS network, UE at CS territory STN as called number, SCC AS is initiated a session request, after SCC AS receives this session request, the speech business of correspondence is switched to CS territory from IMS network, thus completes whole switching.
In FIG, UE is called source session branch (source session Leg) by the session to SCC AS that IMS network is set up, when expression is switched to CS territory from IMS network, this section of session is source session, and UE is called CS session branch (CS session Leg) by the session to SCC AS that CS territory is set up; SCC AS is called far-end session Leg to the session of called UE.
Described above is that traditional VCC realizes principle.Wherein, UE is dual-mode terminal, needs to support Dual Radio (dual-mode dual-standby) simultaneously, namely can carry out audio call in IMS network and CS territory simultaneously.
Along with the development of network architecture flattening, and multiple high-speed wideband moves the appearance of access way, mobile communication standard tissue proposes and is called as LTE/SAE (Long Term Evolution/SystemArchitecture Evolution, Long Term Evolution/System Architecture Evolution) next generation network framework, the transmission rate that this network architecture makes the wireless communication system of evolution can provide higher, shorter transmission delay, and there is lower cost, support 3GPP (3rd Generation Partnership Project simultaneously, third generation partner program) mobility between inter Access System, and the mobility etc. between 3GPP connecting system and non-3 GPP access system.Meanwhile, LTE/SAE also using the one access means as IMS network, supports original VCC function.
But, because UE is very large in bimodulus mode battery energy consumption, and LTE/SAE itself has the reasons such as powerful mobility management capabilities, propose single wireless channel (Single Radio) voice business continuity (Single Radio Voice Call Continuity is called for short SRVCC) technology.Realize the principle Organization Chart of the scheme of SRVCC at present as shown in Figure 2.
In Fig. 2, SAE related network elements has:
E-UTRAN (Evolved UTRAN, the universal land radio access web of evolution): the i.e. wireless access network of evolution is follow-on wireless access network, can provide higher up-downgoing speed, lower transmission delay and more reliable wireless transmission.
MME (Mobility Management Entity, Mobility Management Entity): be chain of command functional entity, be in charge of and store UE context (such as UE mark/user ID, mobility management states, user security parameters etc.), for user distributes temporary mark, and be responsible for carrying out authentication to this user when UE quarters at corresponding tracing area or network.
SAE GW (SAE gateway): be user plane functions entity, is responsible for user face data route processing, is divided into Serving and PDN two kinds.Serving SAE GW (be called for short gateway, or SGW) is mobile anchor point between SAE system and traditional 3GPP system and the mobile anchor point between E-UTRAN; PDN GW (packet data network gateway) is in the downlink data of the UE of idle state for terminating, paging is initiated when the downlink data mailing to UE arrives, and the context of management and storage UE, such as IP bearer service parameter and network internal routing iinformation etc.
In Fig. 2,2G/3G mobile network comprises following network element:
Wireless access network comprises GERAN (the GSM EDGE Radio Access Network of 2G, strengthen the global system for mobile communications Radio Access Network of data rate) and the UTRAN (UniversalTerrestrial Radio Access Network, universal land radio access web) of 3G; Core net comprises circuit domain network element MSC (Mobile Switch Center, mobile switching centre) and grouping domain network element Serving GPRS Support Node (Serving GPRS Support Node is called for short SGSN).Wherein, MSC provides circuit voice service, circuit data service and short message service, and the SAE GW in SGSN and LTE/SAE is connected, and provides packet switch domain service.
Home subscriber server (Home Subscriber Server, be called for short HSS), for managing the data of CS territory, PS territory and IMS network.
In Fig. 2, IMS network comprises: CSCF (Call Session ControlFunction, be called for short CSCF), MGCF (Media Gateway ControlFunction, be called for short MGCF) etc. core network element, and realize the SCC AS of VCC function.
Based on the framework shown in Fig. 2, UE both accessed IMS network by LTE/SAE, also IMS network can be accessed by the PS territory of 2G and 3G (i.e. GERAN/UTRAN and SGSN in Fig. 2), enjoy the business of IMS network, the CS territory of 2G and 3G can also be accessed simultaneously, use the CS business such as speech business.
Network more than for existing in prior art, in order to realize single wireless channel voice business continuity, strengthening existing MSC, being provided with enhanced MSC.CS domain core net unit's core network element in MSC, PS territory of enhanced MSC and 2G/3G and the MME of LTE/SAE network are connected, for the switching of control LTE/SAE network and 2G/3G network.Enhanced MSC is also connected by MGCF and the SCC AS of IMS network, all-calls can be anchored in the SCC AS of IMS network, ensure that the realization of VCC basic function.
The interface of enhanced MSC and MSC adopts E interface.E interface adopts MAP (Mobile Application Part is called for short MAP) signaling, switches the inter-office switchover mode adopting CS territory between enhanced MSC and MSC.Arrange if MSC and MSC strengthened merges, the interacting message between them is then realized by inner Signalling exchange.
Under SRVCC framework, the session to SCC AS that UE is set up by LTE/SAE network and IMS network can be called source session Leg (being namely based upon the sessions carry resource between UE and SCC AS) equally; The enhanced MSC that UE is set up by CS territory is called CS session Leg (being namely based upon the sessions carry resource between enhanced MSC and SCC AS) to the session between SCC AS; The session of SCC AS to far-end UE is called far-end session Leg (being namely based upon the sessions carry resource between SCC AS and far-end UE).
Fig. 2 A is under the SRVCC framework shown in Fig. 2, session is switched to CS network insertion (namely from GERAN/UTRAN access) from LTE/SAE network insertion (namely from E-UTRAN access), flow chart during handoff failure.In this flow process, UE establishes a session by LTE/SAE access network and UE-B in IMS network, and this Session Anchor has arrived in SCC AS; Now, there is the source session Leg being based upon LTE/SAE access network between UE and SCCAS, and the far-end session Leg between SCC AS and UE-B.Switching flow shown in Fig. 2 A comprises the following steps:
A201, UE, after the measurement request receiving LTE/SAE wireless net member E-UTRAN transmission, send measurement report to E-UTRAN, comprise adjacent district information in described measurement report;
A202, E-UTRAN, according to the adjacent district information in measurement report, determine to initiate to switch, therefore send RELOCATION REQUEST message to MME;
A203, after MME receives RELOCATION REQUEST message, according to the information wherein comprised, RELOCATION REQUEST message is forward sent to enhanced MSC, the territory of carrying user in this message switches the integrated services digital network of mark STN and user (Integrated Service Digital Network is called for short ISDN) number;
Above-mentioned STN and ISDN number be MME according to the information of user and configuration, acquire from the HSS of correspondence.
A204, enhanced MSC sends MAP to MSC and prepares handover request message;
A205, MSC send switching to GERAN/UTRAN and require request message, and GERAN/UTRAN returns switching to MSC and requires acknowledgement message;
A206, MSC return MAP to enhanced MSC and prepare handover request ack message, and carry Handover Number in this message, this Handover Number is distributed by MSC;
A207, enhanced MSC is set up and is connected with the circuit between MSC.Such as enhanced MSC sends the initial address message of Integrated Digital Services User Part signaling (ISDN User Part is called for short ISUP) to MSC according to Handover Number, MSC returns the Address Complete Message of ISUP to enhanced MSC;
It should be noted that if enhanced MSC and MSC merge and arrange, then the network element device inside that above-mentioned steps A204, A206 and A207 are arranged in this merging realizes.
A208, enhanced MSC is to the SCC AS initiated domain handover request message of IMS domain; The initial address message that enhanced MSC sends ISUP by MGCF and CSCF of IMS network to SCC AS, carries STN and ISDN number in this message; ISDN number and STN are used to indicate SCC AS and the session of correspondence are switched to CS territory at operation layer from IMS network; SCC AS sends response message to enhanced MSC;
This step also can be that enhanced MSC sends SIP (Session InitialProtocol directly to SCC AS, initial session protocol) conversation request message, the telecommunications universal resource identifier of carrying STN in this message or being converted to by the ISDN number of user (tel URI); SCC AS returns SIP success message (200 OK message) to enhanced MSC;
STN also can be sent to SCC AS by trigger intelligent business by enhanced MSC, obtains routing number from SCC AS, then uses routing number that message is directly sent to SCC AS.
Enhanced MSC is by the ISUP initial address message in this step or SIP conversation request message, and notice SCC AS needs to carry out voice business continuity switching, and respective session is switched to CS territory at operation layer from IMS network by request SCC AS.
Now establish the CS session Leg between enhanced MSC and SCC AS.
A209, SCC AS upgrades far-end session Leg, makes it be connected with CS session Leg, and arranges timer T, for the source of release session Leg when timer expiry;
Arranging timer T can ensure after whole switching completes, source of release session Leg.
A210, enhanced MSC returns relocation response message forward to MME;
A211, MME return relocation response message to E-UTRAN;
A212, E-UTRAN return reorientation command messages to UE;
After A213, UE receive described reorientation command messages, the target access device GERAN/UTRAN to CS territory sends and switches access message.
After A214, GERAN/UTRAN detect switching, send change detection to message to MSC;
A215, MSC send MAP process access signaling message to enhanced MSC, and this message is for notifying that enhanced MSC user terminal has started to access from CS territory;
A216, UE send handoff completion message to GERAN/UTRAN;
A217, GERAN/UTRAN send handoff completion message to MSC;
A218, MSC send MAP to enhanced MSC and send end signal message, and notice enhanced MSC user terminal has been switched to CS territory, according to this MAP end signal message, enhanced MSC knows that switching completes;
If MSC and enhanced MSC merge arrange, then the handoff completion message that enhanced MSC receives steps A 217 knows that switching completes.
A219, after enhanced MSC receives the message (namely MAP sends end signal message) that described UE switched by the expression that objective network (i.e. GERAN/UTRAN or GERAN/UTRAN and MSC) sends, PS to CS handoff completion message is sent to MME, to represent that IMS session has been accomplished to the switching of CS territory access, MME returns PS to CS switching authentic information;
After A220, MME receive described PS to CS handoff completion message, instruction release is based upon the bearing resource of the described session under LTE/SAE network;
A221, MSC are to enhanced MSC loopback ISUP response message (the ISUP initial address message of corresponding steps A 207);
So far, corresponding IMS session completes to be switched to from LTE/SAE network insertion and accesses from CS territory.
The HO-break duration (namely steps A 213 is to the time of steps A 221) of existing wireless technology is approximately 60 to 150ms, owing to needing to carry out SIP route in steps A 208, the time that the SCC AS that territory handover request message arrives IMS domain needs is likely more than 600ms; Therefore conventionally, when the territory handover request message of steps A 208 does not also arrive SCC AS, likely perform steps A 220, and steps A 220 may cause the whole session of release, after therefore the territory handover request message of steps A 208 arrives SCC AS, whole handoff failure can be caused because of can not find the Session Resources that needs to switch.
Summary of the invention
Technical problem to be solved by this invention overcomes the deficiencies in the prior art, provides a kind of voice business continuity switching method, with to overcome in prior art cannot correctly by IMS session from LTE/SAE network insertion successful switch to the problem of CS network insertion.
In order to solve the problem, the invention provides a kind of voice business continuity switching method, the method comprises:
Carrying out voice business continuity switching, when the IP Multimedia System IMS session of user equipment (UE) is switched to the access of circuit commutative field CS territory from Long Term Evolution/System Architecture Evolution LTE/SAE network insertion, UE sends handoff completion message by the target access device in CS territory to enhancing moving exchanging center MSC;
After receiving described handoff completion message, enhanced MSC, after the territory handover success confirming to have received centralized control business and session service application server for continuity SCC AS transmission responds, sends for representing that described IMS session has completed the message being switched to the access of CS territory to Mobility Management Entity MME;
After receiving the described message of enhanced MSC transmission, MME sends the Indication message of the bearing resource for discharging the described IMS session be based upon under LTE/SAE network.
In addition, handover success response in described territory is: the Address Complete Message of Integrated Digital Services User Part signaling ISUP or the response message of ISUP.
In addition, handover success response in described territory is: the success response message of message or SIP is carried out in the ALERTING message of initial session protocol SIP or the session of SIP.
In addition, after receiving the described message of enhanced MSC transmission, MME sends described Indication message to policy controlling system.
The present invention also provides a kind of voice business continuity switching method, and the method comprises:
Carrying out voice business continuity switching, when the IMS session of UE is switched to the access of CS territory from LTE/SAE network insertion, UE sends handoff completion message by the target access device in CS territory to enhanced MSC;
Receive after described handoff completion message also postpones the time span preset, enhanced MSC sends for representing that described IMS session has completed the message being switched to the access of CS territory to MME;
After receiving the described message of enhanced MSC transmission, MME sends the Indication message of the bearing resource for discharging the described IMS session be based upon under LTE/SAE network.
In addition, after receiving described handoff completion message, enhanced MSC by start a length for described in the timer of time span that presets realize the operation of Indication message described in delayed delivery.
In addition, after receiving the described message of enhanced MSC transmission, MME sends described Indication message to policy controlling system.
The present invention also provides a kind of voice business continuity switching method, and the method comprises:
Carrying out voice business continuity switching, when the IMS session of UE is switched to the access of CS territory from LTE/SAE network insertion, UE sends handoff completion message by the target access device in CS territory to enhanced MSC;
After receiving described handoff completion message, enhanced MSC sends for representing that described IMS session has completed the message being switched to the access of CS territory to MME;
Receive after described message that enhanced MSC sends also postpones the time span preset, MME transmission is for discharging the Indication message of bearing resource of the described IMS session be based upon under LTE/SAE network.
In addition, after receiving the described message that enhanced MSC sends, MME by start a length for described in the timer of time span that presets realize the operation of Indication message described in delayed delivery.
In addition, after receiving the described message of enhanced MSC transmission, MME sends described Indication message to policy controlling system.
In sum, adopt voice business continuity switching method of the present invention, to solve after MME receives handoff completion message the mistake whole session of release and the problem of handoff failure that causes.
Accompanying drawing explanation
Fig. 1 is the VCC solution schematic diagram of IMS in prior art;
Fig. 2 is the configuration diagram of the scheme realizing SRVCC in prior art;
Fig. 2 A is under the SRVCC framework shown in Fig. 2, session is switched to CS network insertion (namely from GERAN/UTRAN access) from LTE/SAE network insertion (namely from E-UTRAN access), flow chart during handoff failure;
Fig. 3 carries out the method flow diagram of voice business continuity switching (switching to from the access of CS territory from LTE/SAE network insertion) under based on the SRVCC framework shown in Fig. 2 for first embodiment of the invention;
Fig. 4 carries out the method flow diagram of voice business continuity switching (switching to from the access of CS territory from LTE/SAE network insertion) under based on the SRVCC framework shown in Fig. 2 for second embodiment of the invention;
Fig. 5 carries out the method flow diagram of voice business continuity switching (switching to from the access of CS territory from LTE/SAE network insertion) under based on the SRVCC framework shown in Fig. 2 for third embodiment of the invention.
Embodiment
Main thought of the present invention is, when IMS session is switched to from the access switching of CS territory from LTE/SAE network insertion, enhanced MSC switches completed message by delayed delivery notice MME, postpones to realize MME the object that instruction policy controlling system discharges corresponding IMS Session Resources; Or receive after LTE/SAE network insertion that enhanced MSC sends access the message switched to CS territory at MME, delay indicates policy controlling system to discharge corresponding IMS Session Resources; Or enhanced MSC is after confirmation has received territory handover success response, just send LTE/SAE network insertion to CS territory access handoff completion message to MME.
Describe the present invention below in conjunction with drawings and Examples.
first embodiment:
Fig. 3 carries out the method flow diagram of voice business continuity switching (switching to from the access of CS territory from LTE/SAE network insertion) under based on the SRVCC framework shown in Fig. 2 for first embodiment of the invention.
The core concept of the present embodiment is: after enhanced MSC receives handoff completion message (MAP sends end signal message), switch completed message by delayed delivery notice MME, postpone to realize MME the object that instruction policy controlling system discharges corresponding IMS Session Resources.As shown in Figure 3, the method comprises the following steps:
301, UE, after the measurement request receiving LTE/SAE wireless net member E-UTRAN transmission, sends measurement report to E-UTRAN, comprises adjacent district information in described measurement report;
302, E-UTRAN, according to the adjacent district information in measurement report, determines to initiate to switch, therefore sends RELOCATION REQUEST message to MME;
303, after MME receives RELOCATION REQUEST message, according to the information wherein comprised, RELOCATION REQUEST message is forward sent to enhanced MSC, the territory of carrying user in this message switches the integrated services digital network of mark STN and user (Integrated Service Digital Network is called for short ISDN) number;
Above-mentioned STN and ISDN number be MME according to the information of user and configuration, acquire from the HSS of correspondence.
304, enhanced MSC sends MAP to MSC and prepares handover request message;
305, MSC sends switching to GERAN/UTRAN and requires request message, and GERAN/UTRAN returns switching to MSC and requires acknowledgement message;
306, MSC returns MAP to enhanced MSC and prepares handover request ack message, and carry Handover Number in this message, this Handover Number is distributed by MSC;
307, enhanced MSC is set up and is connected with the circuit between MSC.Such as enhanced MSC sends the initial address message of Integrated Digital Services User Part signaling (ISDN User Part is called for short ISUP) to MSC according to Handover Number, MSC returns the Address Complete Message of ISUP to enhanced MSC;
It should be noted that if enhanced MSC and MSC merge and arrange, then the network element device inside that above-mentioned steps 304,306 and 307 is arranged in this merging realizes.
308, enhanced MSC is to the SCC AS initiated domain handover request message of IMS domain; The initial address message that enhanced MSC sends ISUP by MGCF and CSCF of IMS network to SCC AS, carries STN and ISDN number in this message; ISDN number and STN are used to indicate SCC AS and the session of correspondence are switched to CS territory at operation layer from IMS network; SCC AS sends response message to enhanced MSC;
This step also can be that enhanced MSC sends SIP (Session InitialProtocol directly to SCC AS, initial session protocol) conversation request message, the telecommunications universal resource identifier of carrying STN in this message or being converted to by the ISDN number of user (tel URI); SCC AS returns SIP success message (200 OK message) to enhanced MSC;
STN also can be sent to SCC AS by trigger intelligent business by enhanced MSC, obtains routing number from SCC AS, then uses routing number that message is directly sent to SCC AS.
Enhanced MSC is by the ISUP initial address message in this step or SIP conversation request message, and notice SCC AS needs to carry out voice business continuity switching, and respective session is switched to CS territory at operation layer from IMS network by request SCC AS.
Now establish the CS session Leg between enhanced MSC and SCC AS.
309, SCC AS upgrades far-end session Leg, makes it be connected with CS session Leg, and arranges timer T, for the source of release session Leg when timer expiry;
Arranging timer T can ensure after whole switching completes, source of release session Leg.
310, enhanced MSC returns relocation response message forward to MME;
311, MME returns relocation response message to E-UTRAN;
312, E-UTRAN returns reorientation command messages to UE;
313, UE is switched to GERAN/UTRAN network after receiving described reorientation command messages, sends switch access message to GERAN/UTRAN.
After 314, GERAN/UTRAN detects switching, send change detection to message to MSC;
315, MSC sends MAP process access signaling message to enhanced MSC, and this message is for notifying that enhanced MSC user terminal has started to access from CS territory;
316, UE sends handoff completion message to GERAN/UTRAN;
317, GERAN/UTRAN sends handoff completion message to MSC;
318, MSC sends MAP to enhanced MSC and sends end signal message, and notice enhanced MSC user terminal has been switched to CS territory, according to this message, enhanced MSC knows that switching completes;
If MSC and enhanced MSC merge arrange, then the handoff completion message that enhanced MSC receives step 317 knows that switching completes.
319, enhanced MSC switches the time needed for setting up (the territory handover request message comprising step 308 arrives SCC AS in time needed for SCC AS and step 309 and upgrades the time needed for far-end session Leg) according to territory and arranges timer (can be such as 2 seconds by set timer), performs step 320 after waiting timer time-out;
320, after enhanced MSC receives the message (namely MAP sends end signal message) that described UE switched by the expression that objective network (i.e. GERAN/UTRAN or GERAN/UTRAN and MSC) sends, send PS to CS handoff completion message to MME, MME returns PS to CS switching authentic information;
After 321, MME receives above-mentioned PS to CS handoff completion message, the release of instruction policy controlling system is based upon the bearing resource of the described session under LTE/SAE network;
322, MSC is to enhanced MSC loopback ISUP response message (the ISUP initial address message of corresponding step 307);
So far, corresponding IMS session completes to be switched to from LTE/SAE network insertion and accesses from CS territory.
second embodiment:
Fig. 4 carries out the method flow diagram of voice business continuity switching (switching to from the access of CS territory from LTE/SAE network insertion) under based on the SRVCC framework shown in Fig. 2 for second embodiment of the invention.
The core concept of the present embodiment is: after MME receives PS to CS handoff completion message, postpones instruction policy controlling system release IMS Session Resources.As shown in Figure 4, the method comprises the following steps:
401, UE, after the measurement request receiving LTE/SAE wireless net member E-UTRAN transmission, sends measurement report to E-UTRAN, comprises adjacent district information in described measurement report;
402, E-UTRAN, according to the adjacent district information in measurement report, determines to initiate to switch, therefore sends RELOCATION REQUEST message to MME;
403, after MME receives RELOCATION REQUEST message, according to the information wherein comprised, RELOCATION REQUEST message is forward sent to enhanced MSC, the territory of carrying user in this message switches the integrated services digital network of mark STN and user (Integrated Service Digital Network is called for short ISDN) number;
Above-mentioned STN and ISDN number be MME according to the information of user and configuration, acquire from the HSS of correspondence.
404, enhanced MSC sends MAP to MSC and prepares handover request message;
405, MSC sends switching to GERAN/UTRAN and requires request message, and GERAN/UTRAN returns switching to MSC and requires acknowledgement message;
406, MSC returns MAP to enhanced MSC and prepares handover request ack message, and carry Handover Number in this message, this Handover Number is distributed by MSC;
407, enhanced MSC is set up and is connected with the circuit between MSC.Such as enhanced MSC sends the initial address message of Integrated Digital Services User Part signaling (ISDN User Part is called for short ISUP) to MSC according to Handover Number, MSC returns the Address Complete Message of ISUP to enhanced MSC;
It should be noted that if enhanced MSC and MSC merge and arrange, then the network element device inside that above-mentioned steps 404,406 and 407 is arranged in this merging realizes.
408, enhanced MSC is to the SCC AS initiated domain handover request message of IMS domain; The initial address message that enhanced MSC sends ISUP by MGCF and CSCF of IMS network to SCC AS, carries STN and ISDN number in this message; ISDN number and STN are used to indicate SCC AS and the session of correspondence are switched to CS territory at operation layer from IMS network; SCC AS sends response message to enhanced MSC;
This step also can be that enhanced MSC sends SIP (Session InitialProtocol directly to SCC AS, initial session protocol) conversation request message, the telecommunications universal resource identifier of carrying STN in this message or being converted to by the ISDN number of user (tel URI); SCC AS returns SIP success message (200 OK message) to enhanced MSC;
STN also can be sent to SCC AS by trigger intelligent business by enhanced MSC, obtains routing number from SCC AS, then uses routing number that message is directly sent to SCC AS.
Enhanced MSC is by the ISUP initial address message in this step or SIP conversation request message, and notice SCC AS needs to carry out voice business continuity switching, and respective session is switched to CS territory at operation layer from IMS network by request SCC AS.
Now establish the CS session Leg between enhanced MSC and SCC AS.
409, SCC AS upgrades far-end session Leg, makes it be connected with CS session Leg, and arranges timer T, for the source of release session Leg when timer expiry;
Arranging timer T can ensure after whole switching completes, source of release session Leg.
410, enhanced MSC returns relocation response message forward to MME;
411, MME returns relocation response message to E-UTRAN;
412, E-UTRAN returns reorientation command messages to UE;
413, UE is switched to GERAN/UTRAN network after receiving described reorientation command messages, sends switch access message to GERAN/UTRAN.
After 414, GERAN/UTRAN detects switching, send change detection to message to MSC;
415, MSC sends MAP process access signaling message to enhanced MSC, and this message is for notifying that enhanced MSC user terminal has started to access from CS territory;
416, UE sends handoff completion message to GERAN/UTRAN;
417, GERAN/UTRAN sends handoff completion message to MSC;
418, MSC sends MAP to enhanced MSC and sends end signal message, and notice enhanced MSC user terminal has been switched to CS territory, according to this message, enhanced MSC knows that switching completes;
If MSC and enhanced MSC merge arrange, then the handoff completion message that enhanced MSC receives step 417 knows that switching completes.
419, after enhanced MSC receives the message (namely MAP sends end signal message) that described UE switched by the expression that objective network (i.e. GERAN/UTRAN or GERAN/UTRAN and MSC) sends, send PS to CS handoff completion message to MME, MME returns PS to CS switching authentic information;
420, MME arranges timer, performs step 421 after waiting for this timer expiry;
The release of 421, MME instruction policy controlling system is based upon the bearing resource of the described session under LTE/SAE network;
422, MSC is to enhanced MSC loopback ISUP response message (the ISUP initial address message of corresponding step 407);
So far, corresponding IMS session completes to be switched to from LTE/SAE network insertion and accesses from CS territory.
3rd embodiment:
Fig. 5 carries out the method flow diagram of voice business continuity switching (switching to from the access of CS territory from LTE/SAE network insertion) under based on the SRVCC framework shown in Fig. 2 for third embodiment of the invention.
The core concept of the present embodiment is: after receiving handoff completion message (MAP sends end signal message), enhanced MSC judges whether to receive the territory handover success response that IMS domain (SCC AS) sends, and sends PS to CS handoff completion message after receiving territory handover success response to MME.As shown in Figure 5, the method comprises the following steps:
501, UE, after the measurement request receiving LTE/SAE wireless net member E-UTRAN transmission, sends measurement report to E-UTRAN, comprises adjacent district information in described measurement report;
502, E-UTRAN, according to the adjacent district information in measurement report, determines to initiate to switch, therefore sends RELOCATION REQUEST message to MME;
503, after MME receives RELOCATION REQUEST message, according to the information wherein comprised, RELOCATION REQUEST message is forward sent to enhanced MSC, the territory of carrying user in this message switches the integrated services digital network of mark STN and user (Integrated Service Digital Network is called for short ISDN) number;
Above-mentioned STN and ISDN number be MME according to the information of user and configuration, acquire from the HSS of correspondence.
504, enhanced MSC sends MAP to MSC and prepares handover request message;
505, MSC sends switching to GERAN/UTRAN and requires request message, and GERAN/UTRAN returns switching to MSC and requires acknowledgement message;
506, MSC returns MAP to enhanced MSC and prepares handover request ack message, and carry Handover Number in this message, this Handover Number is distributed by MSC;
507, enhanced MSC is set up and is connected with the circuit between MSC.Such as enhanced MSC sends the initial address message of Integrated Digital Services User Part signaling (ISDN User Part is called for short ISUP) to MSC according to Handover Number, MSC returns the Address Complete Message of ISUP to enhanced MSC;
It should be noted that if enhanced MSC and MSC merge and arrange, then the network element device inside that above-mentioned steps 504,506 and 507 is arranged in this merging realizes.
508, enhanced MSC is to the SCC AS initiated domain handover request message of IMS domain; The initial address message that enhanced MSC sends ISUP by MGCF and CSCF of IMS network to SCC AS, carries STN and ISDN number in this message; ISDN number and STN are used to indicate SCC AS and the session of correspondence are switched to CS territory at operation layer from IMS network; SCC AS sends response message to enhanced MSC;
This step also can be that enhanced MSC sends SIP (Session InitialProtocol directly to SCC AS, initial session protocol) conversation request message, the telecommunications universal resource identifier of carrying STN in this message or being converted to by the ISDN number of user (tel URI); SCC AS returns SIP success message (200 OK message) to enhanced MSC;
STN also can be sent to SCC AS by trigger intelligent business by enhanced MSC, obtains routing number from SCC AS, then uses routing number that message is directly sent to SCC AS.
Enhanced MSC is by the ISUP initial address message in this step or SIP conversation request message, and notice SCC AS needs to carry out voice business continuity switching, and respective session is switched to CS territory at operation layer from IMS network by request SCC AS.
Now establish the CS session Leg between enhanced MSC and SCC AS.
509, SCC AS upgrades far-end session Leg, makes it be connected with CS session Leg, and arranges timer T, for the source of release session Leg when timer expiry;
Arranging timer T can ensure after whole switching completes, source of release session Leg.
510, enhanced MSC returns relocation response message forward to MME;
511, MME returns relocation response message to E-UTRAN;
512, E-UTRAN returns reorientation command messages to UE;
513, UE is switched to GERAN/UTRAN network after receiving described reorientation command messages, sends switch access message to GERAN/UTRAN.
After 514, GERAN/UTRAN detects switching, send change detection to message to MSC;
515, MSC sends MAP process access signaling message to enhanced MSC, and this message is for notifying that enhanced MSC user terminal has started to access from CS territory;
516, UE sends handoff completion message to GERAN/UTRAN;
517, GERAN/UTRAN sends handoff completion message to MSC;
518, MSC sends MAP to enhanced MSC and sends end signal message, and notice enhanced MSC user terminal has been switched to CS territory, according to this message, enhanced MSC knows that switching completes;
If MSC and enhanced MSC merge arrange, then the handoff completion message that enhanced MSC receives step 517 knows that switching completes.
519, the SCC AS of IMS domain responds to enhanced MSC sending domain handover success;
It should be noted that the territory handover success response of this step may be sent to enhanced MSC any time between step 515 and 522, also may be sent to enhanced MSC after step 522.
The handover success response of above-mentioned territory is different according to the interface adopted in step 508, may be Address Complete Message or the response message of ISUP, or 180 of SIP (rings), 183 (session is carried out), 200 (success response) message.
520, after enhanced MSC acknowledges receipt of territory handover success response, send PS to CS handoff completion message to MME, MME returns PS to CS switching authentic information;
The release of 521, MME instruction policy controlling system is based upon the bearing resource of the described session under LTE/SAE network;
522, MSC is to enhanced MSC loopback ISUP response message (the ISUP initial address message of corresponding step 507);
So far, corresponding IMS session completes to be switched to from LTE/SAE network insertion and accesses from CS territory.
Claims (6)
1. a voice business continuity switching method, is characterized in that, the method comprises:
Carrying out voice business continuity switching, when the IMS session of UE is switched to the access of CS territory from LTE/SAE network insertion, UE sends handoff completion message by the target access device in CS territory to enhanced MSC;
Receive after described handoff completion message also postpones the time span preset, enhanced MSC sends for representing that described IMS session has completed the message being switched to the access of CS territory to MME;
After receiving the described message of enhanced MSC transmission, MME sends the Indication message of the bearing resource for discharging the described IMS session be based upon under LTE/SAE network.
2. the method for claim 1, is characterized in that,
After receiving described handoff completion message, enhanced MSC by start a length for described in the timer of time span that presets realize the operation of Indication message described in delayed delivery.
3. method as claimed in claim 1 or 2, is characterized in that,
After receiving the described message of enhanced MSC transmission, MME sends described Indication message to policy controlling system.
4. a voice business continuity switching method, is characterized in that, the method comprises:
Carrying out voice business continuity switching, when the IMS session of UE is switched to the access of CS territory from LTE/SAE network insertion, UE sends handoff completion message by the target access device in CS territory to enhanced MSC;
After receiving described handoff completion message, enhanced MSC sends for representing that described IMS session has completed the message being switched to the access of CS territory to MME;
Receive after described message that enhanced MSC sends also postpones the time span preset, MME transmission is for discharging the Indication message of bearing resource of the described IMS session be based upon under LTE/SAE network.
5. method as claimed in claim 4, is characterized in that,
After receiving the described message that enhanced MSC sends, MME by start a length for described in the timer of time span that presets realize the operation of Indication message described in delayed delivery.
6. the method as described in claim 4 or 5, is characterized in that,
After receiving the described message of enhanced MSC transmission, MME sends described Indication message to policy controlling system.
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| US9351203B2 (en) * | 2013-09-13 | 2016-05-24 | Microsoft Technology Licensing, Llc | Voice call continuity in hybrid networks |
| CN105282769A (en) * | 2014-06-06 | 2016-01-27 | 中兴通讯股份有限公司 | Network switching processing method and device |
| EP3148252B1 (en) * | 2014-06-30 | 2018-12-12 | Huawei Technologies Co. Ltd. | Voice service switching method and device in single radio voice call continuity |
| CN108966299B (en) * | 2014-12-08 | 2021-02-23 | 华为技术有限公司 | Voice switching method and device |
| WO2018119923A1 (en) * | 2016-12-29 | 2018-07-05 | 华为技术有限公司 | Communication method and mobile terminal |
| CN108616940A (en) * | 2016-12-31 | 2018-10-02 | ***通信集团北京有限公司 | A kind of 2G/3G Internet resources method for releasing and mobile communications network |
| KR102336313B1 (en) * | 2017-06-19 | 2021-12-07 | 삼성전자 주식회사 | Method and apparatus of network virtualization and session management |
| CN110881143B (en) * | 2018-09-05 | 2022-07-19 | 中兴通讯股份有限公司 | Set top box management method, device and equipment and computer readable storage medium |
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