CN105050147A - Method and device for circuit switched fallback in process of handover - Google Patents
Method and device for circuit switched fallback in process of handover Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
- H04W36/0022—Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/34—Reselection control
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Abstract
The invention discloses a method and a device for circuit switched (CS) fallback in the process of handover. Quick CS fallback can be realized, the efficiency of CS fallback is improved, and the time delay of CS fallback is reduced. The method comprises the following steps: in the process of handover, whether the handover is an in-station handover or inter-station handover is judged after a handover source side base station receives a message carrying a CS fallback indicator; if the handover is an in-station handover, the handover is cancelled directly and a CS fallback process is performed, or the CS fallback process is performed after the handover fails or succeeds; and if the handover is an inter-station handover, the handover is cancelled directly and a CS fallback process is performed, or a timer is started and the message is cached, and in the timing period of the timer, a CS fallback process is started according to the cached message if the handover fails and is reestablished to the source side base station. According to the embodiment of the invention, the efficiency and success rate of CS fallback in the process of handover are ensured, the time delay of CS fallback is reduced, and the sensitivity of users to voice is enhanced.
Description
Technical field
The present invention relates to Long Term Evolution (LTE, LongTermEvolution) mobile communication system, particularly relate to method and the device of voice fallback (CSFB, CSFallback) in a kind of handoff procedure.
Background technology
CSFallback is a kind of UMTS Terrestrial radio access network (E-UTRAN being applied to evolution, EvolvedUMTSTerrestrialRadioAccessNetwork) network and global system for mobile communications (GSM, or universal mobile telecommunications system (UMTS GlobalSystemforMobileCommunication), UniversalMobileTelecommunicationsSystem) network is with when covering, will to reside in LTE network, with user-dependent circuit switching (CS, CircuitSwitching) the speech business request of setting up in territory falls after rise, the technology of voice foundation is carried out in the CS territory of GSM or UMTS network.
At the initial stage of deployment of LTE network, the covering of 2G or 3G (hereinafter referred to as 2G/3G) network is much larger than LTE network, for not disposing IP Multimedia System (IMS, IPMultmediaSubsystem) network or network not network enabled phone (VOIP, VoiceoverInternetProtocol), user terminal (UE, UserEquipment) situation of VoIP tenability is not possessed, the CS territory by speech business falls back to traditional 2G/3G network by CSFallback is needed to process, even if when deploying IMS network, in order to utilize existing 2G/3G network to greatest extent, operator still can select the CS territory by part of speech business falls back to traditional 2G/3G network by CSFallback to process, and be used for LTE network resource to provide packet switching (PS at a high speed, PacketSwitched) data service in territory, effectively utilize the system bandwidth of LTE.
In CSFallback process, if the carrying of UE built vertical non-voice service when receiving the service request in CS territory, and this UE and objective network support that packet domain switches (PSHO, PacketServiceHandover), then by PSHO process, non-voice service is switched to objective network, voice service request is fallen back to objective network.If UE and objective network do not support PSHO, evolved base station (eNB, eNodeB) 2G/3G network can be redirected to by auxiliary UE, or instruction (CCO is changed in community, CellChangeOrder) to 2G network, the foundation of speech business is initiated in the CS territory of objective network 2G/3G network.
In LTE system, the state of UE is divided into connected state (RRC_CONNECTED) and Idle state (RRC_IDLE) two kinds, when being in the UE under RRC_CONNECTED state and being moved to another community from Serving cell, switching (handover) will be triggered, to ensure the continuity of business, switch the switching being divided in eNB and switching and between eNB, switch the cell-of-origin referring to switching and Target cell in eNB to be positioned at same switching between eNB, eNB and to refer to that the cell-of-origin of switching and Target cell are positioned at different eNB.Whether participated in the classification of handoff procedure angle from the packet-based core networks (EPC, EvolvedPacketCore) of evolution, or occurred in S1 interface or X2 interface classification from switching, the switching between eNB is divided into again S1 to switch and X2 switches.
When UE is in rrc--connected state in handoff procedure state, such as switch in station, S1 switches, when X2 switches, switch source eNB and receive mobile management entity (MME, MobileManagenmentEntity) this UE of UE context modification request (UECONTEXTMODIFYREQUEST) message instruction eNB carrying voice fallback instruction (CSFallbackIndicatior) initiated will initiate CSFallback process, describe according to 3GPPTS23.401 agreement, when switching source eNB receives the UE context modification request message of carrying CSFallbackIndicatior, need reply UE contextual modifications failure (UECONTEXTMODIFYFAILURE) message to MME and carry corresponding cause value, after MME needs to wait until that UE is switched to target rear flank or handoff failure, again UE context modification request (UECONTEXTMODIFYREQUEST) message of carrying CSFallbackIndicatior is sent to eNB, CSFallback process is again initiated to indicate eNB, the response efficiency of this process influence CSFallback and success rate, add the time delay of CSFallback.
Summary of the invention
Embodiments provide the method and apparatus of voice fallback in a kind of handoff procedure, Rapid Speech can be realized and fall after rise, improve the efficiency of voice fallback, reduce the time delay of voice fallback.
In order to solve the problems of the technologies described above, the invention provides the method for voice fallback in a kind of handoff procedure, comprising:
In handoff procedure, switch after source base station receives the message of carrying voice fallback instruction, judge that type that this switches switches in station or switching between station;
If switch in station, then directly cancel this and switch, perform voice fallback flow process, or perform voice fallback flow process again after to be switched failure or handover success;
If switch between station, then directly cancel this and switch, perform voice fallback flow process, or start timer and message described in buffer memory, in timer, if handoff failure re-establishes go back to source base station, then according to the described message initiated voice fallback flow process of buffer memory.
Further, described if switch in station, then directly cancel this and switch, perform voice fallback flow process, or perform voice fallback flow process again after to be switched failure or handover success, comprising:
If switch in station, judge currently to be in handoff preparation phase or handover execution stage, if be in handoff preparation phase, then directly cancel this and switch, perform voice fallback flow process; If be in handover execution stage, then after to be switched failure or handover success, then perform voice fallback flow process.
Further, described if switch between station, then directly cancel this to switch, perform voice fallback flow process, or start timer and message described in buffer memory, in timer, if handoff failure re-establishes go back to source base station, again according to the described message initiated voice fallback flow process of buffer memory, comprising:
If switch between station, judge currently to be in handoff preparation phase or handover execution stage, if be in handoff preparation phase, then directly cancel this and switch, perform voice fallback flow process; If be in handover execution stage, then start message described in timer buffer memory, in timer, if handoff failure re-establishes go back to source base station, then stop described timer, then according to the described message initiated voice fallback flow process of buffer memory.
Further, if switch between station, described method also comprises: judging that this switches is that X2 switches or S1 switches.
Further, if X2 switches, this switching of described direct cancellation, performs voice fallback flow process, comprising: send handover cancelling message to switching base station, target side, cancels this and switches, and perform voice fallback flow process.
Further, if S1 switches, this switching of described direct cancellation, performs voice fallback flow process, comprising: send handover cancelling message to mobile management entity MME, cancels this and switches, and perform voice fallback flow process.
Further, if X2 switches, message described in described startup timer buffer memory, in timer, if handoff failure re-establishes go back to source base station, then stops described timer, then according to the described message initiated voice fallback flow process of buffer memory, comprising:
Start timer, and message described in buffer memory, in timer, if handoff failure re-establishes go back to source base station, then stop described timer, to be reconstructed stood after, again according to the described message of buffer memory, reply contextual modifications success message to MME, start voice fallback flow process.
Further, if handoff failure re-establishes go back to source base station, described method also comprises: if re-establish failure, then reply contextual modifications failed message to MME, and to carry cause value be X2 handover trigger.
Further, described method also comprises: if timer expiry, then reply contextual modifications failed message to MME, and to carry cause value be X2 handover trigger.
Further, if S1 switches, message described in described startup timer buffer memory, in timer, if handoff failure re-establishes go back to source base station, then stops described timer, then according to the described message initiated voice fallback flow process of buffer memory, comprising:
Start timer, and message described in buffer memory, in timer, if handoff failure re-establishes go back to source base station, then stop described timer, to be reconstructed stood after, again according to the described message of buffer memory, reply contextual modifications success message to MME, start voice fallback flow process.
Further, if handoff failure re-establishes go back to source base station, described method also comprises: if re-establish failure, then reply contextual modifications failed message to MME, and to carry cause value be S1 handover trigger in system.
Further, described method also comprises: if timer expiry, then reply contextual modifications failed message to MME, and to carry cause value be S1 handover trigger in system.
In order to solve the problems of the technologies described above, present invention also offers the device of voice fallback in a kind of handoff procedure, be positioned at and switch source base station, described device comprises judge module, switches hand-off process module between processing module and station in standing, wherein:
Described judge module, in handoff procedure, after receiving the message of carrying voice fallback instruction in described switching source base station, judges that the type that this switches switches in station or switches between station;
Switch processing module in described station, for judge at described judge module this switch be switch in station time, directly cancel this switching, execution voice fallback flow process, or perform voice fallback flow process after to be switched failure or handover success;
Hand-off process module between described station, for judge at described judge module this switch be station between switch time, this switching of direct cancellation, perform voice fallback flow process, or start timer and message described in buffer memory, in timer, if handoff failure re-establishes go back to source base station, then according to the described message initiated voice fallback flow process of buffer memory.
Further, switch processing module in described station and comprise the first judging unit, the first handoff preparation phase processing unit and the first handover execution stage processing unit, wherein:
Described first judging unit, is currently in handoff preparation phase or handover execution stage for judging;
Described first handoff preparation phase processing unit, for judge at described first judging unit current be in handoff preparation phase time, directly cancel this and switch, perform voice fallback flow process,
Described first handover execution stage processing unit, for judge at described first judging unit current be in handover execution stage time, after to be switched failure or handover success, perform voice fallback flow process.
Further, between described station, hand-off process module comprises the second judging unit, the second handoff preparation phase processing unit and the second handover execution stage processing unit, wherein:
Described second judging unit, is currently in handoff preparation phase or handover execution stage for judging;
Described second handoff preparation phase processing unit, for judge at described second judging unit current be in handoff preparation phase time, directly cancel this and switch, perform voice fallback flow process,
Described second handover execution stage processing unit, for judge at described second judging unit current be in handover execution stage time, start timer and message described in buffer memory, in timer, if handoff failure re-establishes go back to source base station, then stop described timer, then according to the described message initiated voice fallback flow process of buffer memory.
Further, between described station, hand-off process module also comprises the 3rd judging unit, is that X2 switches or S1 switches for judging that this switches.
Further, described second handoff preparation phase processing unit described second judging unit judge current be in handoff preparation phase time, directly cancel this and switch, perform voice fallback flow process, comprising:
Described second handoff preparation phase processing unit judges currently to be in handoff preparation phase at described second judging unit, and described 3rd judging unit judge this switch be X2 switch time, send handover cancelling message to switching base station, target side, cancel this and switch, and perform voice fallback flow process.
Further, described second handoff preparation phase processing unit described second judging unit judge current be in handoff preparation phase time, directly cancel this and switch, perform voice fallback flow process, comprising:
Described second handoff preparation phase processing unit judges currently to be in handoff preparation phase at described second judging unit, and described 3rd judging unit judge this switch be S1 switch time, send handover cancelling message to mobile management entity MME, cancel this and switch, and perform voice fallback flow process.
Further, described second handover execution stage processing unit starts timer and message described in buffer memory, in timer, if handoff failure re-establishes go back to source base station, then stop described timer, then according to the described message initiated voice fallback flow process of buffer memory, comprising:
Described second handover execution stage processing unit judges currently to be in handover execution stage at described second judging unit, and described 3rd judging unit judge this switch be X2 switch time, start timer, and message described in buffer memory, in timer, if handoff failure re-establishes go back to source base station, then stop described timer, to be reconstructed stood after, then reply contextual modifications success message according to the described message of buffer memory to MME, start voice fallback flow process.
Further, described second handover execution stage processing unit also for: when handoff failure re-establishes go back to source base station, if re-establish failure, then reply contextual modifications failed message to MME, and to carry cause value be X2 handover trigger.
Further, described second handover execution stage processing unit also for: when timer expiry, reply contextual modifications failed message to MME, and to carry cause value be X2 handover trigger.
Further, described second handover execution stage processing unit starts timer and message described in buffer memory, in timer, if handoff failure re-establishes go back to source base station, then stop described timer, then according to the described message initiated voice fallback flow process of buffer memory, comprising:
Described second handover execution stage processing unit judges currently to be in handover execution stage at described second judging unit, and described 3rd judging unit judge this switch be S1 switch time, start timer, and message described in buffer memory, in timer, if handoff failure re-establishes go back to source base station, then stop described timer, to be reconstructed stood after, then reply contextual modifications success message according to the described message of buffer memory to MME, start voice fallback flow process.
Further, described second handover execution stage processing unit also for: when handoff failure re-establishes go back to source base station, if re-establish failure, then reply contextual modifications failed message to MME, and to carry cause value be S1 handover trigger in system.
Further, described second handover execution stage processing unit also for: when timer expiry, reply contextual modifications failed message to MME, and to carry cause value be S1 handover trigger in system.
Embodiment of the present invention method is on the basis of correlation technique, UE is in rrc--connected state in handoff procedure state, switch the UE context modification request message of carrying CSFallbackIndicatior that source eNB receives MME initiation, CSFallback flow process is preferentially performed according to different switch steps, to a certain extent, ensure that efficiency and the success rate of CSFallback in handoff procedure, reduce the time delay of CSFallback, improve the voice susceptibility of user.
Other features and advantages of the present invention will be set forth in the following description, and, partly become apparent from specification, or understand by implementing the present invention.Object of the present invention and other advantages realize by structure specifically noted in specification, claims and accompanying drawing and obtain.
Accompanying drawing explanation
Accompanying drawing is used to provide the further understanding to technical solution of the present invention, and forms a part for specification, is used from and explains technical scheme of the present invention, do not form the restriction to technical solution of the present invention with the embodiment one of the application.
Fig. 1 is the embodiment of the present invention 1 voice fallback method flow diagram;
Fig. 2 is a kind of flow processing schematic diagram that in the embodiment of the present invention 1, in handoff procedure, Rapid Speech falls after rise;
Fig. 3 is the embodiment of the present invention 2 voice fallback apparatus structure schematic diagram;
Fig. 4 switches processing module structural representation in the embodiment of the present invention 2 station;
Fig. 5 is hand-off process modular structure schematic diagram between the embodiment of the present invention 2 station;
Fig. 6 is hand-off process modular structure schematic diagram between the embodiment of the present invention 2 another kind station;
Fig. 7 is process schematic diagram when handoff preparation phase receives the UE context modification request carrying CSFallbackIndicatior in application example 1 of the present invention application station;
Fig. 8 is process schematic diagram when handover execution stage receives the UE context modification request carrying CSFallbackIndicatior in application example 2 of the present invention application station;
Fig. 9 is the process schematic diagram that application example 3 of the present invention applies when X2 handoff preparation phase receives the UE context modification request carrying CSFallbackIndicatior;
Figure 10 is the process schematic diagram that application example 4 of the present invention applies when X2 handover execution stage receives the UE context modification request carrying CSFallbackIndicatior;
Figure 11 is the process schematic diagram that application example 5 of the present invention applies when S1 handoff preparation phase receives the UE context modification request carrying CSFallbackIndicatior;
Figure 12 is the process schematic diagram that application example 6 of the present invention applies when S1 handover execution stage receives the UE context modification request carrying CSFallbackIndicatior.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly understand, hereinafter will be described in detail to embodiments of the invention by reference to the accompanying drawings.It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combination in any mutually.
Can perform in the computer system of such as one group of computer executable instructions in the step shown in the flow chart of accompanying drawing.Further, although show logical order in flow charts, in some cases, can be different from the step shown or described by order execution herein.
Embodiment 1
The present embodiment introduces the method for voice fallback in a kind of handoff procedure, as shown in Figure 1, comprising:
Step 1, in handoff procedure, after switching source base station receives the message of carrying voice fallback instruction (CSFallbackIndicatior), judge that the type that this switches switches in station or switches between station, if switch in station, perform step 2, if switch between station, perform step 3;
The message that switching source base station receives can be the UE context modification request (UECONTEXTMODIFYREQUEST) carrying voice fallback instruction that MME initiates.
Step 2, directly cancels this and switches, perform voice fallback flow process, or performs voice fallback flow process again after to be switched failure or handover success;
Wherein, if switch in station, also judge currently to be in handoff preparation phase or handover execution stage, if be in handoff preparation phase, then directly cancel this to switch, perform voice fallback flow process, if be in handover execution stage, then after to be switched failure or handover success, then perform voice fallback flow process.
Step 3, directly cancels this and switches, perform voice fallback flow process, or starts timer and message described in buffer memory, in timer, if handoff failure re-establishes go back to source base station, according to the described message initiated voice fallback flow process of buffer memory.
Wherein, if switch between station, judge currently to be in handoff preparation phase or handover execution stage, if be in handoff preparation phase, then directly cancel this to switch, perform voice fallback flow process, if be in handover execution stage, then start timer and message described in buffer memory, in timer, if handoff failure re-establishes go back to source base station, then stop described timer, then according to the described message initiated voice fallback flow process of buffer memory.
In a preferred embodiment, if switch between station (comprising X2 to switch or S1 switching), described method also comprises: judging that this switches is that X2 switches or S1 switches.Judgement is that X2 switches or S1 switches and judges that current residing switch step does not limit sequencing, first can judge current residing switch step (switch and prepare or switch to perform), judge it is that X2 switches or S1 switches again, or first judge it is that X2 switches or S1 switches, then judge current residing switch step.
When switching between standing, if X2 switches, and current when being in handoff preparation phase, handover cancelling message can be sent to switching base station, target side, cancel this and switch, and perform voice fallback flow process.
When switching between standing, if S1 switches, and current when being in handoff preparation phase, handover cancelling message can be sent to mobile management entity (MME), cancel this and switch, and perform voice fallback flow process.
When switching between standing, if X2 switches, and current when being in handover execution stage, start timer, and message described in buffer memory, in timer, if handoff failure re-establishes go back to source base station, then stop described timer, to be reconstructed stood after, reply contextual modifications success message according to the described message of buffer memory to MME again, start voice fallback flow process.If re-establish failure, then reply contextual modifications failed message to MME, and to carry cause value be X2 handover trigger (X2Handovertriggered).If timer expiry, then reply contextual modifications failed message to MME, and to carry cause value be X2 handover trigger.
When switching between standing, if S1 switches, and current when being in handover execution stage, start timer, and message described in buffer memory, in timer, if handoff failure re-establishes go back to source base station, then stop described timer, to be reconstructed stood after, reply contextual modifications success message according to the described message of buffer memory to MME again, start voice fallback flow process.If re-establish failure, then reply contextual modifications failed message to MME, and to carry cause value be S1 handover trigger (S1intrasystemHandovertriggered) in system.If timer expiry, then reply contextual modifications failed message to MME, and to carry cause value be S1 handover trigger in system.
Above-mentioned timer, for can join timer, is preferably T304 timer.
For the switching being in handoff preparation phase, switching by directly cancelling this, performing voice fallback flow process, realize Rapid Speech and fall after rise; For the switching being in handover execution stage, timer is set and buffer memory carry voice fallback instruction message, in timer, if handoff failure when re-establishing the connection with source base station, get the message of carrying voice fallback instruction of buffer memory, directly start voice fallback flow process according to this message, and need not wait for that MME initiates the message that this carries voice fallback instruction again.If whether handoff failure also when re-establishing with the connection of source base station also failure, then participates in switching according to core net and sends different message to MME.When timer expiry, not think and need to carry out voice fallback flow process in switching source base station, get the message of carrying voice fallback instruction of buffer memory and reply the failure of UE contextual modifications directly to MME and carry corresponding cause value (whether participating in switch reasons value according to core net different).Embodiment of the present invention method, by preferentially performing voice fallback flow process in different switch steps, ensure that efficiency and the success rate of voice fallback in handoff procedure to a certain extent, reduces the time delay of voice fallback, improve the voice susceptibility of user.
Fig. 2 is the technical scheme realizing above-described embodiment method, and its process is divided into following step:
The first step: switch that source eNB receives that MME initiates carry UE context modification request (UECONTEXTMODIFYREQUEST) message of voice fallback instruction (CSFallbackIndicatior) time, eNB judges switching type, if switch in station, perform second step, if X2 switches, perform the 3rd step, if S1 switches, perform the 4th step;
Second step: if switch in station, then judge the stage residing for switching:
If <a> handoff preparation phase, directly cancel this and switch, and reply the success of UE contextual modifications to MME, preferentially perform CSFallback flow process;
If <b> handover execution stage, the context modification request message of first buffer memory CSFallback, after to be switched failure or handover success, get this UE context modification request of buffer memory and reply the success of UE contextual modifications to MME, then performing CSFallback flow process;
3rd step: if X2 switches, then judge the stage residing for switching:
If <a> handoff preparation phase, switch source eNB and send out handover cancelling (HANDOVERCANCEL) message directly to switching target side eNB, cancel this to switch, and reply the success of UE contextual modifications to MME, preferential execution CSFallback flow process;
If <b> handover execution stage, first start one and can join timer (preferred T304 timer), buffer memory carries the UE context modification request message of CSFallbackIndicatior, if UE handoff failure re-establishes back source eNB, stop described timer, perform re-established after, then according to buffer memory message, reply the success of UE contextual modifications to MME, start CSFallback flow process; If re-establish failure, replying UE contextual modifications failure (UECONTEXTMODIFYFAILURE) message to MME and carry corresponding cause value is X2 handover trigger, the failure of CSFB flow process; If described timer expiry, replying UE contextual modifications failure (UECONTEXTMODIFYFAILURE) message to MME and carry cause value is X2 handover trigger, the failure of CSFB flow process;
4th step: if S1 switches, then judge the stage residing for switching:
If <a> handoff preparation phase, send out handover cancelling (HANDOVERCANCEL) message to MME, cancel this and switch, and reply the success of UE contextual modifications to MME, preferential execution CSFallback flow process;
If <b> handover execution stage, first start one and can join timer (preferred T304 timer), buffer memory carries the UE context modification request message of CSFallbackIndicatior, if UE handoff failure re-establishes back source eNB, stop described timer, after execution has re-established, get message described in buffer memory and reply the success of UE contextual modifications to MME, restarting CSFallback flow process; If re-establish failure, replying UE contextual modifications failed message to MME and carry corresponding cause value is S1 handover trigger in system, the failure of CSFB flow process; If this timer expiry, replying UE contextual modifications failed message to MME and carry S1 cause value is S1 handover trigger in system, the failure of CSFB flow process.
Embodiment 2
The present embodiment describes the device realizing voice fallback in the handoff procedure of embodiment method, and this device is positioned at and switches source base station, and as shown in Figure 3, described device comprises judge module 10, switches hand-off process module 30 between processing module 20 and station in standing, wherein:
Described judge module 10, in handoff procedure, after receiving the message of carrying voice fallback instruction (CSFallbackIndicatior) in described switching source base station, judges that the type that this switches switches in station or switches between station;
Switch processing module 20 in described station, for judge at described judge module 10 this switch be switch in station time, directly cancel this switching, execution voice fallback flow process, or perform voice fallback flow process after to be switched failure or handover success;
Hand-off process module 30 between described station, for judge at described judge module 10 this switch be station between switch time, this switching of direct cancellation, perform voice fallback flow process, or start timer and message described in buffer memory, in timer, if handoff failure re-establishes go back to source base station, then according to the described message initiated voice fallback flow process of buffer memory.
As shown in Figure 4, wherein, switch processing module 20 in standing and comprise the first judging unit 201, first handoff preparation phase processing unit 202 and the first handover execution stage processing unit 203, wherein:
Described first judging unit 201, is currently in handoff preparation phase or handover execution stage for judging;
Described first handoff preparation phase processing unit 202, for judge at described first judging unit 201 current be in handoff preparation phase time, directly cancel this and switch, perform voice fallback flow process,
Described first handover execution stage processing unit 203, for judge at described first judging unit 201 current be in handover execution stage time, after to be switched failure or handover success, perform voice fallback flow process.
As shown in Figure 5, wherein, between described station, hand-off process module 30 comprises the second judging unit 301, second handoff preparation phase processing unit 302 and the second handover execution stage processing unit 303, wherein:
Described second judging unit 301, is currently in handoff preparation phase or handover execution stage for judging;
Described second handoff preparation phase processing unit 302, for judge at described second judging unit 301 current be in handoff preparation phase time, directly cancel this and switch, perform voice fallback flow process,
Described second handover execution stage processing unit 303, for judge at described second judging unit 301 current be in handover execution stage time, start timer and message described in buffer memory, in timer, if handoff failure re-establishes go back to source base station, then stop described timer, then according to the described message initiated voice fallback flow process of buffer memory.
Alternatively, as shown in Figure 6, between described station, hand-off process module also comprises the 3rd judging unit 304, is that X2 switches or S1 switches for judging that this switches.
Described second handoff preparation phase processing unit 302 judges currently to be in handoff preparation phase at described second judging unit 301, and described 3rd judging unit 304 judge this switch be X2 switch time, handover cancelling message is sent to switching base station, target side, cancel this to switch, and perform voice fallback flow process.
Described second handoff preparation phase processing unit 302 judges currently to be in handoff preparation phase at described second judging unit 301, and described 3rd judging unit 304 judge this switch be S1 switch time, send handover cancelling message to MME, cancel this and switch, and perform voice fallback flow process.
Described second handover execution stage processing unit 303 judges currently to be in handover execution stage at described second judging unit 301, and described 3rd judging unit 304 judge this switch be X2 switch time, start timer, and message described in buffer memory, in timer, if handoff failure re-establishes go back to source base station, then stop described timer, to be reconstructed stood after, reply contextual modifications success message according to the described message of buffer memory to MME, start voice fallback flow process.Alternatively, described second handover execution stage processing unit 303 also for: when handoff failure re-establishes go back to source base station, if re-establish failure, then reply contextual modifications failed message to MME, and to carry cause value be X2 handover trigger.Alternatively, described second handover execution stage processing unit 303 also for: when timer expiry, reply contextual modifications failed message to MME, and to carry cause value be X2 handover trigger.
Described second handover execution stage processing unit 303 judges currently to be in handover execution stage at described second judging unit 301, and described 3rd judging unit 304 judge this switch be S1 switch time, start timer, and message described in buffer memory, in timer, if handoff failure re-establishes go back to source base station, then stop described timer, to be reconstructed stood after, reply contextual modifications success message according to the described message of buffer memory to MME, start voice fallback flow process.Alternatively, described second handover execution stage processing unit 303 also for: when handoff failure re-establishes go back to source base station, if re-establish failure, then reply contextual modifications failed message to MME, and to carry cause value be S1 handover trigger in system.Alternatively, described second handover execution stage processing unit 303 also for: when timer expiry, reply contextual modifications failed message to MME, and to carry cause value be S1 handover trigger in system.
With application example, above-described embodiment method is described below.
Application example 1:
This example is processing procedure when handoff preparation phase receives the UE context modification request carrying CSFallbackIndicatior in station, as shown in Figure 7.
The handover source community Cell1 of the 201st step: eNB receives the measurement report of UE, switches in enforcement of the judgment station;
How switch in enforcement of the judgment station and can adopt existing techniques in realizing, the present invention repeats no more.
202nd step: carry out interior switching preparation of standing at the switching target small area Cell2 of eNB, Target cell Cell2 carries out switching the resource and admission process prepared;
203rd step: handover source community Cell1, receive MME trigger carry the UE context modification request message of CSFallbackIndicatior after, judge currently to be in handoff preparation phase in eNB, decision-making is first cancelled this and is switched, and preferentially performs CSFallback flow process;
204th step: the switching set-up procedure cancelling switching target small area Cell2 in station;
205th step: handover source community Cell1 replys the contextual modifications response message of UE to MME;
206th step: handover source community Cell1 according to information such as the adjacent areas of UE ability information and different system, judgement voice fallback mode;
How to judge that voice fallback mode can adopt existing techniques in realizing, the present invention repeats no more.
207th step: according to the court verdict of CSFB, makes being redirected between its UE executive system, or CCO or PSHO;
After 208th step: UE receives the Indication message of corresponding voice fallback mode, carry out the Establishing process of CS territory speech business at GSM or UMTS system.
Application example 2:
This example is processing procedure when handover execution stage receives the UE context modification request carrying CSFallbackIndicatior in station, as shown in Figure 8.
301st step: handover source community Cell1, receives the measurement report of UE, switches in enforcement of the judgment station, carries out switching after switching receiving completes being ready to complete at Target cell Cell2, starts and waits for that reprovision completes waiting timer;
302nd step: switch after being ready to complete, handover source community Cell1 issues the reallocation message of switching to UE, triggers UE and carries out random access procedure at switching target small area Cell2;
303rd step: handover source community Cell1, receive that MME triggers carry the UE context modification request message of CSFallback after, judge currently to be in handover execution stage in eNB, first buffer memory UE context modification request message;
304a walks: if switching target small area Cell2 receives the handoff completion message of UE, the reprovision namely switched completes message;
305a walks: the contextual modifications response message of replying UE to MME, performs the 306th step;
304b walks: if eNB receives UE re-establish request message;
304b1 walks: eNB cancels this hand-off execution process in station;
305b2 walks, and UE and eNB performs and re-establishes flow process;
305b3 walks: re-establish successfully, get the UE context modification request message of carrying CSFallbackIndicatior of buffer memory;
306th step: handover source community Cell1 according to information such as the adjacent areas of UE ability information and different system, judgement voice fallback mode;
307th step: according to the court verdict of CSFB, makes being redirected between its UE executive system, or CCO or PSHO;
After 308th step: UE receives the Indication message of corresponding voice fallback mode, carry out the Establishing process of CS territory speech business at GSM or UMTS system.
This flow process comprises two kinds of different situations:
Wherein situation comprises a step 301-303,304a, 305a, 306-308; The handover execution stage switched in station, receive the UE context modification request carrying CSFallbackIndicatior of MME, first this message of buffer memory, when after UE handover success to Target cell Cell2, get buffered message and reply the success of UE contextual modifications to MME, then performing CSFallback flow process.
Another kind of situation comprises step 301-303,304b, 304b1,305b2,305b3,306-308; The handover execution stage switched in station, receive the UE context modification request carrying CSFallbackIndicatior of MME, first this message of buffer memory, when after UE handoff failure, re-establish the non-switching community of handover source community Cell1 or this eNB, get buffer memory buffer memory and reply the success of UE contextual modifications to MME, then performing CSFallback flow process.
Application example 3:
This example is the processing procedure of X2 handoff preparation phase when receiving the UE context modification request carrying CSFallbackIndicatior, as shown in Figure 9.
401st step: eNB1 receives the measurement report of UE, is switched by eNB1 enforcement of the judgment X2;
402nd step: eNB1 gives as switching source and switches target side eNB2, sends handover request (HANDOVERREQUEST) message, carries out X2 and switch set-up procedure;
After what the 403rd step: eNB1 received that MME triggers carry the UE context modification request message of CSFallbackIndicatior, judge currently to be in X2 handoff preparation phase, preferentially perform CSFallback flow process;
404th step: cancel the switching set-up procedure switching target side eNB2;
405th step: eNB1 replys the contextual modifications response message of UE to MME;
406th step: eNB1 according to information such as the adjacent areas of UE ability information and different system, judgement voice fallback mode;
407th step: according to the court verdict of CSFB, makes being redirected between its UE executive system, or CCO or PSHO;
After 408th step: UE receives the Indication message of corresponding voice fallback mode, carry out the Establishing process of CS territory speech business at GSM or UMTS system.
Application example 4:
This example is the processing procedure of X2 handover execution stage when receiving the UE context modification request carrying CSFallbackIndicatior, as shown in Figure 10.
501st step: eNB1 receives the measurement report of UE, is switched by eNB1 enforcement of the judgment X2, and sends handover request (HANDOVERREQUEST) message to target side eNB2;
502nd step: eNB1 receives Handover Request Acknowledge (HANDOVERREQUESTACKNOWLEDGE) message switching target side eNB2, and issues the reallocation message of switching to UE, triggers UE and carries out random access procedure at switching target side eNB2;
After what the 503rd step: eNB1 received that MME triggers carry the UE context modification request message of CSFallbackIndicatior, judge currently to be in X2 handover execution stage;
504th step: first buffer memory carries the UE context modification request message of CSFallbackIndicatior, and start T304 timer and wait for that UE handoff failure re-establishes back source eNB1;
505a walks: if T304 timer expiry, and eNB1 replys UE contextual modifications failed message to MME, the failure of CSFallback flow process;
505b walks: if in T304 timer time, this timer is not overtime, and what eNB1 received UE re-establishes request message, first stops this timer;
506b walks: eNB1 first gives and switches target side eNB2 initiation handover cancelling (HANDOVERCANCEL) message, restarts and re-establishes flow process;
507b walks: perform and re-establish process;
508c walks: if UE re-establishes failure, and eNB1 first replys the failure of UE contextual modifications to MME and carries X2Handovertriggered cause value, the failure of CSFallback flow process;
508b walks: if UE re-establishes successfully, and eNB1 first replys the success of UE contextual modifications to MME, then starts CSFallback flow process;
509b walks: eNB according to information such as the adjacent areas of UE ability information and different system, judgement voice fallback mode;
510b walks: according to the court verdict of CSFB, makes being redirected between its UE executive system, or CCO or PSHO;
511b walks: after UE receives the Indication message of corresponding voice fallback mode, carry out the Establishing process of CS territory speech business at GSM or UMTS system.
This flow process comprises three kinds of different situations,
Wherein situation comprises a step 501-504,505a; The execution phase that X2 switches between station, eNB1 receive MME trigger carry the UE context modification request message of CSFallbackIndicatior after, first start T304 timer, this message of buffer memory again, when described timer expiry, replying the failure of UE contextual modifications to MME and carrying cause value is the failure of X2Handovertriggered, CSFB flow process;
A kind of situation comprises step 501-504,505b, 506b, 507b, 508b, 509b, 510b, 511b; The execution phase that X2 switches between station, eNB1 receive MME trigger carry the UE context modification request message of CSFallbackIndicatior after, first start T304 timer, then this message of buffer memory, in timer, UE handoff failure re-establishes back source eNB, stop described timer, perform re-established after, then according to buffer memory message, and reply the success of UE contextual modifications to MME, start CSFallback flow process;
Another kind of situation comprises step 501-504,505b, 506b, 507b, 508c; The execution phase that X2 switches between station, eNB1 receive MME trigger carry the UE context modification request message of CSFallbackIndicatior after, first start T304 timer, this message of buffer memory again, in timer, UE handoff failure re-establishes back source eNB, stop described timer, if re-establish failure, reply the failure of UE contextual modifications to MME and carry corresponding cause value, the failure of CSFB flow process.
Application example 5:
This example is the processing procedure of S1 handoff preparation phase when receiving the UE context modification request carrying CSFallbackIndicatior, as shown in figure 11.
601st step: eNB1 receives the measurement report of UE, is switched by eNB1 enforcement of the judgment S1;
602nd step: eNB1 sends handover request (HANDOVERREQUIRED) message as switching source to MME, carries out S1 and switches set-up procedure;
After what the 603rd step: eNB1 received that MME triggers carry the UE context modification request message of CSFallbackIndicatior, judge currently to be in S1 handoff preparation phase, preferentially perform CSFallback flow process;
604th step: eNB1 sends handover cancelling (HANDOVERCANCEL) message directly to MME, cancels the switching set-up procedure switching target side eNB2;
605th step: eNB1 replys the contextual modifications response message of UE to MME;
606th step: eNB1 according to information such as the adjacent areas of UE ability information and different system, judgement voice fallback mode;
607th step: according to the court verdict of CSFB, makes being redirected between its UE executive system, or CCO or PSHO;
After 608th step: UE receives the Indication message of corresponding voice fallback mode, carry out the Establishing process of CS territory speech business at GSM or UMTS system.
Application example 6:
This example is the processing procedure of S1 handover execution stage when receiving the UE context modification request carrying CSFallbackIndicatior, as shown in figure 12.
701st step: eNB1 receives the measurement report of UE, is switched by eNB1 enforcement of the judgment S1, and eNB1 sends handover request (HANDOVERREQUIRED) message as switching source to MME, carries out S1 and switches set-up procedure;
702nd step: eNB1 receives switching command (HANDOVERCOMMAND) message of target MME, and issues the reallocation message of switching to UE, triggers UE and carries out random access procedure at switching target side eNB2;
After what the 703rd step: eNB1 received that MME triggers carry the UE context modification request message of CSFallbackIndicatior, judge currently to be in S1 handover execution stage;
704th step: first buffer memory carries the UE context modification request message of CSFallbackIndicatior, and start T304 timer and wait for that UE handoff failure re-establishes back source eNB1;
705a walks: if T304 timer expiry, and eNB1 replys UE contextual modifications failed message to MME, the failure of CSFallback flow process;
705b walks: if in T304 timer time, this timer is not overtime, and what eNB1 received UE re-establishes request message, first stops this timer;
706b walks: eNB1 first initiates handover cancelling (HANDOVERCANCEL) message to MME, restarts and re-establishes flow process;
707b walks: perform and re-establish process;
708c walks: if re-establish failure, and eNB1 first replys the failure of UE contextual modifications to MME and carries cause value is the failure of S1intrasystemHandovertriggered, CSFallback flow process;
708b walks: if re-establish successfully, and eNB1 first replys the success of UE contextual modifications to MME, then starts CSFallback flow process;
709b walks: eNB according to information such as the adjacent areas of UE ability information and different system, judgement voice fallback mode;
710b walks: according to the court verdict of CSFB, makes being redirected between its UE executive system, or CCO or PSHO;
711b walks: after UE receives the Indication message of corresponding voice fallback mode, carry out the Establishing process of CS territory speech business at GSM or UMTS system.
This flow process comprises three kinds of different situations,
Wherein situation comprises a step 701-704,705a; The execution phase that S1 switches between station, eNB1 receive MME trigger carry the UE context modification request message of CSFallbackIndicatior after, first start T304 timer, this message of buffer memory again, when described timer expiry, replying the failure of UE contextual modifications to MME and carrying cause value is the failure of S1intrasystemHandovertriggered, CSFB flow process;
A kind of situation comprises step 701-704,705b, 706b, 707b, 708b, 709b, 710b, 711b; The execution phase that S1 switches between station, eNB1 receive MME trigger carry the UE context modification request message of CSFallbackIndicatior after, first start T304 timer, then this message of buffer memory, in timer, UE handoff failure re-establishes back source eNB, stop described timer, perform re-established after, then according to buffer memory message, and reply the success of UE contextual modifications to MME, start CSFallback flow process;
Another kind of situation comprises step 701-704,705b, 706b, 707b, 708c; The execution phase that S1 switches between station, eNB1 receive MME trigger carry the UE context modification request message of CSFallbackIndicatior after, first start T304 timer, this message of buffer memory again, in timer, UE handoff failure re-establishes back source eNB, stop described timer, if re-establish failure, reply the failure of UE contextual modifications to MME and carry corresponding cause value, the failure of CSFB flow process.
The method and apparatus that in the embodiment of the present invention, in handoff procedure, Rapid Speech falls after rise only for LTE communication system, but is not limited only to this, and embodiment of the present invention method and apparatus can also be applied to other communication systems.
The all or part of step that one of ordinary skill in the art will appreciate that in said method is carried out instruction related hardware by program and is completed, and said procedure can be stored in computer-readable recording medium, as read-only memory, disk or CD etc.Alternatively, all or part of step of above-described embodiment also can use one or more integrated circuit to realize.Correspondingly, each module/unit in above-described embodiment can adopt the form of hardware to realize, and the form of software function module also can be adopted to realize.The embodiment of the present invention is not restricted to the combination of the hardware and software of any particular form.
Although the execution mode disclosed by the present invention is as above, the execution mode that described content only adopts for ease of understanding the present invention, and be not used to limit the present invention.Those of skill in the art belonging to any the present invention; under the prerequisite not departing from the spirit and scope disclosed by the present invention; any amendment and change can be carried out in the form implemented and details; but scope of patent protection of the present invention, the scope that still must define with appending claims is as the criterion.
Claims (24)
1. the method for voice fallback in handoff procedure, is characterized in that, comprising:
In handoff procedure, switch after source base station receives the message of carrying voice fallback instruction, judge that type that this switches switches in station or switching between station;
If switch in station, then directly cancel this and switch, perform voice fallback flow process, or perform voice fallback flow process again after to be switched failure or handover success;
If switch between station, then directly cancel this and switch, perform voice fallback flow process, or start timer and message described in buffer memory, in timer, if handoff failure re-establishes go back to source base station, then according to the described message initiated voice fallback flow process of buffer memory.
2. method according to claim 1, is characterized in that,
Described if switch in station, then directly cancel this and switch, perform voice fallback flow process, or perform voice fallback flow process again after to be switched failure or handover success, comprising:
If switch in station, judge currently to be in handoff preparation phase or handover execution stage, if be in handoff preparation phase, then directly cancel this and switch, perform voice fallback flow process; If be in handover execution stage, then after to be switched failure or handover success, then perform voice fallback flow process.
3. method according to claim 1 and 2, is characterized in that,
Described if switch between station, then directly cancel this and switch, perform voice fallback flow process, or start timer and message described in buffer memory, in timer, if handoff failure re-establishes go back to source base station, again according to the described message initiated voice fallback flow process of buffer memory, comprising:
If switch between station, judge currently to be in handoff preparation phase or handover execution stage, if be in handoff preparation phase, then directly cancel this and switch, perform voice fallback flow process; If be in handover execution stage, then start message described in timer buffer memory, in timer, if handoff failure re-establishes go back to source base station, then stop described timer, then according to the described message initiated voice fallback flow process of buffer memory.
4. method according to claim 3, is characterized in that, if switch between station, described method also comprises: judging that this switches is that X2 switches or S1 switches.
5. method according to claim 4, is characterized in that,
If X2 switches, this switching of described direct cancellation, performs voice fallback flow process, comprising: send handover cancelling message to switching base station, target side, cancels this and switches, and perform voice fallback flow process.
6. method according to claim 4, is characterized in that,
If S1 switches, this switching of described direct cancellation, performs voice fallback flow process, comprising: send handover cancelling message to mobile management entity MME, cancels this and switches, and perform voice fallback flow process.
7. the method according to claim 4 or 5, is characterized in that,
If X2 switches, message described in described startup timer buffer memory, in timer, if handoff failure re-establishes go back to source base station, then stops described timer, then according to the described message initiated voice fallback flow process of buffer memory, comprising:
Start timer, and message described in buffer memory, in timer, if handoff failure re-establishes go back to source base station, then stop described timer, to be reconstructed stood after, again according to the described message of buffer memory, reply contextual modifications success message to MME, start voice fallback flow process.
8. method according to claim 7, is characterized in that,
If handoff failure re-establishes go back to source base station, described method also comprises: if re-establish failure, then reply contextual modifications failed message to MME, and to carry cause value be X2 handover trigger.
9. method according to claim 7, is characterized in that, described method also comprises: if timer expiry, then reply contextual modifications failed message to MME, and to carry cause value be X2 handover trigger.
10. the method according to claim 4 or 6, is characterized in that,
If S1 switches, message described in described startup timer buffer memory, in timer, if handoff failure re-establishes go back to source base station, then stops described timer, then according to the described message initiated voice fallback flow process of buffer memory, comprising:
Start timer, and message described in buffer memory, in timer, if handoff failure re-establishes go back to source base station, then stop described timer, to be reconstructed stood after, again according to the described message of buffer memory, reply contextual modifications success message to MME, start voice fallback flow process.
11. methods according to claim 10, is characterized in that,
If handoff failure re-establishes go back to source base station, described method also comprises: if re-establish failure, then reply contextual modifications failed message to MME, and to carry cause value be S1 handover trigger in system.
12. methods according to claim 10, is characterized in that, described method also comprises: if timer expiry, then reply contextual modifications failed message to MME, and to carry cause value be S1 handover trigger in system.
The device of voice fallback in 13. 1 kinds of handoff procedures, be positioned at and switch source base station, described device comprises judge module, switches hand-off process module between processing module and station in standing, wherein:
Described judge module, in handoff procedure, after receiving the message of carrying voice fallback instruction in described switching source base station, judges that the type that this switches switches in station or switches between station;
Switch processing module in described station, for judge at described judge module this switch be switch in station time, directly cancel this switching, execution voice fallback flow process, or perform voice fallback flow process after to be switched failure or handover success;
Hand-off process module between described station, for judge at described judge module this switch be station between switch time, this switching of direct cancellation, perform voice fallback flow process, or start timer and message described in buffer memory, in timer, if handoff failure re-establishes go back to source base station, then according to the described message initiated voice fallback flow process of buffer memory.
14. devices according to claim 13, is characterized in that,
Switch processing module in described station and comprise the first judging unit, the first handoff preparation phase processing unit and the first handover execution stage processing unit, wherein:
Described first judging unit, is currently in handoff preparation phase or handover execution stage for judging;
Described first handoff preparation phase processing unit, for judge at described first judging unit current be in handoff preparation phase time, directly cancel this and switch, perform voice fallback flow process,
Described first handover execution stage processing unit, for judge at described first judging unit current be in handover execution stage time, after to be switched failure or handover success, perform voice fallback flow process.
15. devices according to claim 13 or 14, is characterized in that,
Between described station, hand-off process module comprises the second judging unit, the second handoff preparation phase processing unit and the second handover execution stage processing unit, wherein:
Described second judging unit, is currently in handoff preparation phase or handover execution stage for judging;
Described second handoff preparation phase processing unit, for judge at described second judging unit current be in handoff preparation phase time, directly cancel this and switch, perform voice fallback flow process,
Described second handover execution stage processing unit, for judge at described second judging unit current be in handover execution stage time, start timer and message described in buffer memory, in timer, if handoff failure re-establishes go back to source base station, then stop described timer, then according to the described message initiated voice fallback flow process of buffer memory.
16. devices according to claim 15, is characterized in that,
Between described station, hand-off process module also comprises the 3rd judging unit, is that X2 switches or S1 switches for judging that this switches.
17. devices according to claim 16, is characterized in that,
Described second handoff preparation phase processing unit described second judging unit judge current be in handoff preparation phase time, directly cancel this and switch, perform voice fallback flow process, comprising:
Described second handoff preparation phase processing unit judges currently to be in handoff preparation phase at described second judging unit, and described 3rd judging unit judge this switch be X2 switch time, send handover cancelling message to switching base station, target side, cancel this and switch, and perform voice fallback flow process.
18. devices according to claim 16, is characterized in that,
Described second handoff preparation phase processing unit described second judging unit judge current be in handoff preparation phase time, directly cancel this and switch, perform voice fallback flow process, comprising:
Described second handoff preparation phase processing unit judges currently to be in handoff preparation phase at described second judging unit, and described 3rd judging unit judge this switch be S1 switch time, send handover cancelling message to mobile management entity MME, cancel this and switch, and perform voice fallback flow process.
19. devices according to claim 16 or 17, is characterized in that,
Described second handover execution stage processing unit starts timer and message described in buffer memory, in timer, if handoff failure re-establishes go back to source base station, then stop described timer, again according to the described message initiated voice fallback flow process of buffer memory, comprising:
Described second handover execution stage processing unit judges currently to be in handover execution stage at described second judging unit, and described 3rd judging unit judge this switch be X2 switch time, start timer, and message described in buffer memory, in timer, if handoff failure re-establishes go back to source base station, then stop described timer, to be reconstructed stood after, then reply contextual modifications success message according to the described message of buffer memory to MME, start voice fallback flow process.
20. devices according to claim 19, is characterized in that,
Described second handover execution stage processing unit also for: when handoff failure re-establishes go back to source base station, if re-establish failure, then reply contextual modifications failed message to MME, and to carry cause value be X2 handover trigger.
21. devices according to claim 19, is characterized in that,
Described second handover execution stage processing unit also for: when timer expiry, reply contextual modifications failed message to MME, and to carry cause value be X2 handover trigger.
22. devices according to claim 16 or 18, is characterized in that,
Described second handover execution stage processing unit starts timer and message described in buffer memory, in timer, if handoff failure re-establishes go back to source base station, then stop described timer, again according to the described message initiated voice fallback flow process of buffer memory, comprising:
Described second handover execution stage processing unit judges currently to be in handover execution stage at described second judging unit, and described 3rd judging unit judge this switch be S1 switch time, start timer, and message described in buffer memory, in timer, if handoff failure re-establishes go back to source base station, then stop described timer, to be reconstructed stood after, then reply contextual modifications success message according to the described message of buffer memory to MME, start voice fallback flow process.
23. devices according to claim 22, is characterized in that,
Described second handover execution stage processing unit also for: when handoff failure re-establishes go back to source base station, if re-establish failure, then reply contextual modifications failed message to MME, and to carry cause value be S1 handover trigger in system.
24. devices according to claim 22, is characterized in that,
Described second handover execution stage processing unit also for: when timer expiry, reply contextual modifications failed message to MME, and to carry cause value be S1 handover trigger in system.
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| CN201510372608.1A CN105050147B (en) | 2015-06-30 | 2015-06-30 | Method and device for voice fallback in switching process |
| PCT/CN2015/094599 WO2017000473A1 (en) | 2015-06-30 | 2015-11-13 | Cs fallback method and apparatus in handover process |
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| CN201510372608.1A CN105050147B (en) | 2015-06-30 | 2015-06-30 | Method and device for voice fallback in switching process |
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