CN105050147B - Method and device for voice fallback in switching process - Google Patents

Method and device for voice fallback in switching process Download PDF

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CN105050147B
CN105050147B CN201510372608.1A CN201510372608A CN105050147B CN 105050147 B CN105050147 B CN 105050147B CN 201510372608 A CN201510372608 A CN 201510372608A CN 105050147 B CN105050147 B CN 105050147B
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switching
handover
message
timer
voice fallback
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CN105050147A (en
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邹俊
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ZTE Corp
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ZTE Corp
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Priority to PCT/CN2015/094599 priority patent/WO2017000473A1/en
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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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/34—Reselection control

Abstract

The invention discloses a method and a device for voice fallback in a switching process, which can realize fast voice fallback, improve the efficiency of voice fallback and reduce the time delay of voice fallback. The method comprises the following steps: in the switching process, after receiving a message carrying a voice fallback indication, a base station at the switching source side judges whether the type of the switching is intra-station switching or inter-station switching; if the switching is in-station switching, the switching is directly cancelled, and a voice fallback procedure is executed, or the voice fallback procedure is executed after the switching fails or the switching succeeds; if the switching is between the stations, the switching is directly cancelled, the voice fallback flow is executed, or a timer is started and the message is cached, and within the timing time of the timer, if the switching fails, the source side base station is rebuilt, and the voice fallback flow is started according to the cached message. The embodiment of the invention ensures the efficiency and the success rate of the voice fallback in the switching process, reduces the time delay of the voice fallback and improves the voice experience of the user.

Description

Method and device for voice fallback in switching process
Technical Field
The present invention relates to a Long Term Evolution (LTE) mobile communication system, and in particular, to a method and an apparatus for voice Fallback (CSFB) in a handover procedure.
Background
The CS Fallback is a technology applied to an Evolved UMTS Terrestrial Radio Access Network (E-UTRAN) Network, and when the E-UTRAN Network and a Global System for Mobile Communication (GSM) or a Universal Mobile Telecommunications System (UMTS) Network are covered with each other, a Circuit Switching (CS) domain voice service establishment request related to a user, which is already resident in the LTE Network, falls back, and voice establishment is performed in a CS domain of the GSM or UMTS Network.
In the early stage of LTE network deployment, the coverage of 2G or 3G (hereinafter referred to as 2G/3G) networks is much larger than that of LTE networks, for the case that no IP Multimedia Subsystem (IMS) network is deployed or the network does not support VOIP (Voice over Internet Protocol), and the User terminal (UE) does not have the VoIP support capability, voice traffic needs to be handled through the CS Fallback back to the CS domain of the legacy 2G/3G network, even in the case of an IMS network, in order to make the best use of the existing 2G/3G network, the operator may choose to drop part of the voice traffic back to the CS domain of the legacy 2G/3G network through the CS Fallback to process, however, LTE network resources are used to provide data services in a Packet Switched (PS) domain at high speed, and the system bandwidth of LTE is effectively utilized.
In the CS Fallback procedure, if the UE has established a bearer of the non-voice Service when receiving the Service request in the CS domain, and the UE and the target network support Packet domain Handover (PS HO), the non-voice Service may be switched to the target network through the PS HO procedure, and the voice Service request is dropped back to the target network. If the UE and the target network do not support PS HO, an evolved node B (eNB, eNodeB) can redirect to the 2G/3G network through assisting the UE, or a Cell Change Order (CCO) is sent to the 2G network, and the establishment of the voice service is initiated in a CS domain of the 2G/3G network of the target network.
In an LTE system, the state of a UE is divided into a CONNECTED state (RRC _ CONNECTED) and an IDLE state (RRC _ IDLE), when the UE in the RRC _ CONNECTED state moves from a serving cell to another cell, a handover (handover) is triggered to ensure service continuity, the handover is divided into an intra-eNB handover and an inter-eNB handover, the intra-eNB handover refers to that a source cell and a target cell to be handed over are located in the same eNB, and the inter-eNB handover refers to that the source cell and the target cell to be handed over are located in different enbs. The handover between enbs is further classified into an S1 handover and an X2handover from the viewpoint of whether an Evolved Packet Core (EPC) participates in completing a handover procedure, or from the viewpoint that the handover occurs on an S1 interface or an X2 interface.
When the UE in the RRC _ CONNECTED state is in a handover process state, such as an intra-station handover, an S1 handover, and an X2handover, the handover-source eNB receives a UE CONTEXT modification REQUEST (UE CONTEXT REQUEST) message with a voice Fallback indicator (CS Fallback indicator) initiated by a Mobile Management Entity (MME), which indicates that the UE is to initiate a CS Fallback procedure, and when the handover-source eNB receives the UE CONTEXT modification REQUEST message with the CS Fallback indicator, the handover-source eNB needs to reply a UE CONTEXT modification FAILURE (UE CONTEXT modification FAILURE) message to the MME and carry a corresponding cause value, and the MME needs to wait until the UE is handed over to the target side or the handover fails, and resends the UE CONTEXT modification REQUEST (UE CONTEXT modification REQUEST) message with the CS Fallback indicator to the eNB to indicate that the UE once again initiates the CS Fallback procedure, the efficiency of the CS Fallback procedure and the success rate of the CS Fallback procedure are affected by the MME, increasing the delay of the CS Fallback.
Disclosure of Invention
The embodiment of the invention provides a method and a device for voice fallback in a switching process, which can realize fast voice fallback, improve the efficiency of voice fallback and reduce the time delay of voice fallback.
In order to solve the above technical problem, the present invention provides a method for voice fallback in a handover process, comprising:
in the switching process, after receiving a message carrying a voice fallback indication, a base station at the switching source side judges whether the type of the switching is intra-station switching or inter-station switching;
if the switching is in-station switching, the switching is directly cancelled, and a voice fallback procedure is executed, or the voice fallback procedure is executed after the switching fails or the switching succeeds;
if the switching is between the stations, the switching is directly cancelled, the voice fallback flow is executed, or a timer is started and the message is cached, and within the timing time of the timer, if the switching fails, the source side base station is rebuilt, and the voice fallback flow is started according to the cached message.
Further, if the switching is in-station switching, the switching is directly cancelled, and a voice fallback procedure is executed, or the voice fallback procedure is executed after the switching fails or is successfully executed, including:
if the switching is in-station switching, judging whether the current switching is in a switching preparation stage or a switching execution stage, and if the switching is in the switching preparation stage, directly canceling the switching and executing a voice fallback flow; and if the mobile terminal is in the switching execution stage, executing a voice fallback flow after the switching fails or the switching succeeds.
Further, if the inter-station handover is performed, directly canceling the handover, executing a voice fallback procedure, or starting a timer and caching the message, and if the handover fails, reestablishing the source-side base station within a timer period, and then starting the voice fallback procedure according to the cached message, the method includes:
if the switching is between the stations, judging whether the current switching is in a switching preparation stage or a switching execution stage, and if the switching is in the switching preparation stage, directly canceling the switching and executing a voice fallback flow; if the mobile terminal is in the switching execution stage, a timer is started and the message is cached, and within the timing time of the timer, if the switching fails and the source side base station is reestablished, the timer is stopped, and then the voice fallback flow is started according to the cached message.
Further, if the switching between the stations is performed, the method further comprises the following steps: whether the switching is X2 switching or S1 switching is judged.
Further, if it is an X2handover, the directly canceling the handover, and executing a voice fallback procedure includes: and sending a switching cancellation message to the base station at the switching target side, canceling the switching, and executing a voice fallback flow.
Further, if it is the S1 handover, the directly canceling the current handover and executing the voice fallback procedure includes: and sending a switching cancellation message to a Mobile Management Entity (MME), canceling the switching, and executing a voice fallback flow.
Further, if the handover is an X2handover, the starting a timer and caching the message, and within a timer period of the timer, if the handover fails and the source base station is reestablished, stopping the timer, and then starting a voice fallback procedure according to the cached message, including:
starting a timer, caching the message, stopping the timer if the source base station is reestablished in a handover failure within the timing time of the timer, and after reestablishment is completed, replying a context modification success message to the MME according to the cached message, and starting a voice fallback procedure.
Further, if the source base station is reestablished in case of handover failure, the method further includes: if the reestablishment fails, a context modification failure message is replied to the MME and carries a cause value of X2handover trigger.
Further, the method further comprises: if the timer is overtime, a context modification failure message is replied to MME and carries a cause value of X2handover trigger.
Further, if the handover is S1, the starting a timer and caching the message, and within the timer time of the timer, if the handover fails and the source base station is reestablished, stopping the timer, and then starting a voice fallback procedure according to the cached message, includes:
starting a timer, caching the message, stopping the timer if the source base station is reestablished in a handover failure within the timing time of the timer, and after reestablishment is completed, replying a context modification success message to the MME according to the cached message, and starting a voice fallback procedure.
Further, if the source base station is reestablished in case of handover failure, the method further includes: if the reestablishment fails, a context modification failure message is replied to the MME, and the cause value is carried as an intra-system S1 handover trigger.
Further, the method further comprises: if the timer is overtime, a context modification failure message is replied to the MME and carries a cause value as an intra-system S1 handover trigger.
In order to solve the above technical problem, the present invention further provides a device for voice fallback in a handover process, located in a base station on a source side of the handover, where the device includes a determining module, an intra-site handover processing module, and an inter-site handover processing module, where:
the judging module is used for judging whether the type of the switching is intra-station switching or inter-station switching after the base station at the switching source side receives the message carrying the voice fallback indication in the switching process;
the in-station switching processing module is used for directly canceling the switching and executing a voice fallback procedure when the judging module judges that the switching is in-station switching, or executing the voice fallback procedure after the switching fails or is successfully switched;
the inter-station switching processing module is used for directly canceling the switching and executing the voice fallback flow or starting a timer and caching the message when the judging module judges that the switching is the inter-station switching, and starting the voice fallback flow according to the cached message if the switching fails and the source side base station is rebuilt within the timing time of the timer.
Further, the intra-site handover processing module includes a first judgment unit, a first handover preparation phase processing unit, and a first handover execution phase processing unit, wherein:
the first judging unit is used for judging whether the current switching preparation stage or the switching execution stage is in;
the first switching preparation stage processing unit is used for directly canceling the switching and executing a voice fallback procedure when the first judging unit judges that the current switching preparation stage is in the switching preparation stage,
and the first switching execution stage processing unit is used for executing a voice fallback procedure after the first judging unit judges that the current switching execution stage is in a switching failure or switching success.
Further, the inter-station handover processing module includes a second determining unit, a second handover preparation phase processing unit, and a second handover execution phase processing unit, wherein:
the second judging unit is used for judging whether the current switching preparation stage or the switching execution stage is in;
the second switching preparation stage processing unit is used for directly canceling the switching and executing a voice falling process when the second judging unit judges that the current switching preparation stage is in the switching preparation stage,
and the second handover execution stage processing unit is configured to start a timer and cache the message when the second determining unit determines that the current handover execution stage is in the handover execution stage, stop the timer if the source base station is reestablished in a handover failure within a timer period, and start a voice fallback procedure according to the cached message.
Further, the inter-station handover processing module further includes a third determining unit, configured to determine whether the current handover is an X2handover or an S1 handover.
Further, when the second judging unit judges that the current switching preparation stage is in the second switching preparation stage, the second switching preparation stage processing unit directly cancels the current switching, and executes a voice fallback procedure, including:
when the second judgment unit judges that the current handover is the X2handover, the second handover preparation stage processing unit sends a handover cancel message to the handover target base station, cancels the current handover, and executes a voice fallback procedure.
Further, when the second judging unit judges that the current switching preparation stage is in the second switching preparation stage, the second switching preparation stage processing unit directly cancels the current switching, and executes a voice fallback procedure, including:
when the second judging unit judges that the current handover is in the handover preparation stage and the third judging unit judges that the current handover is S1 handover, the second handover preparation stage processing unit sends a handover cancel message to the mobility management entity MME, cancels the current handover, and executes a voice fallback procedure.
Further, the second handover execution stage processing unit starts a timer and buffers the message, stops the timer if the handover fails and the source base station is reestablished within the timer time of the timer, and starts a voice fallback procedure according to the buffered message, including:
the second handover execution stage processing unit starts a timer and caches the message when the second judging unit judges that the current handover is the X2handover, stops the timer if the handover fails to reestablish the source base station within the timer, and replies a context modification success message to the MME according to the cached message after the reestablishment is completed, and starts a voice fallback procedure.
Further, the second handover execution phase processing unit is further configured to: when the source base station is reestablished in the handover failure, if reestablishment fails, a context modification failure message is replied to the MME, and the handover trigger is carried with a cause value of X2.
Further, the second handover execution phase processing unit is further configured to: when the timer is over, the context modification failure message is returned to the MME, and the reason value is carried as X2handover trigger.
Further, the second handover execution stage processing unit starts a timer and buffers the message, stops the timer if the handover fails and the source base station is reestablished within the timer time of the timer, and starts a voice fallback procedure according to the buffered message, including:
the second handover execution stage processing unit starts a timer and buffers the message when the second judging unit judges that the current handover is the handover execution stage, and the third judging unit judges that the current handover is the S1 handover, stops the timer if the source base station is reestablished in a handover failure within a timer period, and after the reestablishment is completed, replies a context modification success message to the MME according to the buffered message, and starts a voice fallback procedure.
Further, the second handover execution phase processing unit is further configured to: when the source base station is reestablished in the handover failure, if the reestablishment fails, a context modification failure message is replied to the MME, and the context modification failure message carries a cause value as an intra-system S1 handover trigger.
Further, the second handover execution phase processing unit is further configured to: and when the timer is over, replying a context modification failure message to the MME, and carrying a reason value as an intra-system S1 handover trigger.
On the basis of the related technology, when the UE in the RRC _ CONNECTED state is in the switching process state, the eNB on the switching source side receives a UE context modification request message which is initiated by an MME and carries a CS Fallback indicator, and the CSfallback flow is preferentially executed according to different switching stages, so that the efficiency and the success rate of the CS Fallback in the switching process are ensured to a certain extent, the time delay of the CS Fallback is reduced, and the voice sensitivity of a user is improved.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the example serve to explain the principles of the invention and not to limit the invention.
FIG. 1 is a flow chart of a voice fallback method according to an embodiment 1 of the present invention;
fig. 2 is a schematic flow chart of fast speech fallback in a handover procedure in embodiment 1 of the present invention;
fig. 3 is a schematic structural diagram of a voice fallback apparatus in embodiment 2 of the present invention;
fig. 4 is a schematic structural diagram of an intra-site handover processing module according to embodiment 2 of the present invention;
fig. 5 is a schematic structural diagram of an inter-station handover processing module according to embodiment 2 of the present invention;
fig. 6 is a schematic structural diagram of another inter-station handover processing module according to embodiment 2 of the present invention;
fig. 7 is a schematic processing diagram of application example 1 when a UE context modification request carrying a CS Fallback indicator is received in an application station switch preparation phase;
fig. 8 is a schematic processing diagram of an application example 2 when an intra-station handover execution phase receives a UE context modification request carrying a CS Fallback indicator;
fig. 9 is a schematic processing diagram of application example 3 when an application X2handover preparation phase receives a UE context modification request carrying a CS Fallback indicator;
fig. 10 is a schematic processing diagram of application example 4 when the application X2handover execution phase receives a UE context modification request carrying a CS Fallback indicator;
fig. 11 is a schematic processing diagram of application example 5 when receiving a UE context modification request carrying a CS Fallback indicator in the S1 handover preparation phase;
fig. 12 is a schematic processing diagram of application example 6 when the handover execution stage of application S1 receives a UE context modification request carrying a CS Fallback indicator.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
The steps illustrated in the flow charts of the figures may be performed in a computer system such as a set of computer-executable instructions. Also, while a logical order is shown in the flow diagrams, in some cases, the steps shown or described may be performed in an order different than here.
Example 1
This embodiment introduces a method for falling back in a handover process, as shown in fig. 1, including:
step 1, in the switching process, after receiving a message carrying a voice Fallback indicator (CS Fallback indicator), a switching source side base station judges whether the type of the switching is intra-station switching or inter-station switching, if the switching is intra-station switching, step 2 is executed, and if the switching is inter-station switching, step 3 is executed;
the message received by the handover source side base station may be a UE CONTEXT modification REQUEST (UE CONTEXT modification REQUEST) initiated by the MME and carrying the voice fallback indication.
Step 2, directly canceling the switching, and executing a voice fallback procedure, or executing the voice fallback procedure after the switching fails or is successfully switched;
if the switching is in-station switching, whether the current switching preparation stage or the switching execution stage is judged, if the switching preparation stage is, the current switching is directly cancelled, the voice fallback procedure is executed, and if the switching execution stage is, the voice fallback procedure is executed after the switching fails or the switching succeeds.
And 3, directly canceling the switching, executing the voice fallback flow, or starting a timer and caching the message, and if the switching fails and the source side base station is reestablished within the timing time of the timer, starting the voice fallback flow according to the cached message.
If the switching is between stations, judging whether the switching is currently in a switching preparation stage or a switching execution stage, if the switching is in the switching preparation stage, directly canceling the switching, executing a voice fallback procedure, if the switching is in the switching execution stage, starting a timer and caching the message, if the switching fails and the source side base station is reestablished within the timing time of the timer, stopping the timer, and starting the voice fallback procedure according to the cached message.
In a preferred embodiment, if it is an inter-station handover (including an X2handover or an S1 handover), the method further comprises: whether the switching is X2 switching or S1 switching is judged. The determination of whether the switching is X2 switching or S1 switching and the determination of the current switching stage are not limited in sequence, and the current switching stage (switching preparation or switching execution) may be determined first, and then the determination of whether the switching is X2 switching or S1 switching, or the determination of whether the switching is X2 switching or S1 switching, and then the current switching stage is determined.
During the inter-station handover, if the handover is the X2handover and is currently in the handover preparation stage, a handover cancel message may be sent to the handover target base station, the current handover is cancelled, and a voice fallback procedure is executed.
During inter-station handover, if the handover is S1 and the current handover preparation stage is, a handover cancel message may be sent to a Mobility Management Entity (MME), cancel the handover, and execute a voice fallback procedure.
During inter-station handover, if the handover is X2handover and the current handover is in a handover execution stage, starting a timer and caching the message, within the timing time of the timer, if the source base station is reestablished in a handover failure, stopping the timer, after reestablishment is completed, replying a context modification success message to the MME according to the cached message, and starting a voice fallback procedure. And if the reestablishment fails, replying a context modification failure message to the MME, and carrying a reason value of X2Handover trigger (X2Handover trigger). If the timer is overtime, a context modification failure message is replied to MME and carries a cause value of X2handover trigger.
During inter-station handover, if the handover is S1 handover and the current handover execution stage is, starting a timer and caching the message, within the timer time, if the handover fails to reestablish the source base station, stopping the timer, after the reestablishment is completed, replying a context modification success message to the MME according to the cached message, and starting a voice fallback procedure. And if the reestablishment fails, replying a context modification failure message to the MME, and carrying a reason value as an intra-system Handover triggered S1 (S1 intra-system Handover triggered). If the timer is overtime, a context modification failure message is replied to the MME and carries a cause value as an intra-system S1 handover trigger.
The timer is a configurable timer, preferably a T304 timer.
For the switching in the switching preparation stage, a voice fallback flow is executed by directly canceling the switching, so that the fast voice fallback is realized; setting a timer and caching a message carrying the voice fallback indication for the handover in the handover execution stage, and if the handover fails and the connection with the source side base station is reestablished within the timing time of the timer, taking the cached message carrying the voice fallback indication, and directly starting a voice fallback procedure according to the message without waiting for the MME to initiate the message carrying the voice fallback indication again. And if the switching fails and the reestablishment of the connection with the source side base station also fails, sending different messages to the MME according to whether the core network participates in the switching. When the timer is overtime, it is considered that a voice fallback procedure is not required to be performed at the base station at the switching source side, the cached message carrying the voice fallback indication is taken, and the message carrying the voice fallback indication directly replies that the UE context modification fails and carries a corresponding cause value (different cause values are carried according to whether the core network participates in the switching). According to the method provided by the embodiment of the invention, the voice fallback flow is preferentially executed at different switching stages, so that the efficiency and success rate of voice fallback in the switching process are ensured to a certain extent, the time delay of voice fallback is reduced, and the voice experience of a user is improved.
Fig. 2 is a technical solution for implementing the method of the embodiment, and the processing is divided into the following steps:
the first step is as follows: when a switching source side eNB receives a UE CONTEXT modification REQUEST (UE CONTEXT MODIFY REQUEST) message which is initiated by an MME and carries a voice Fallback indicator (CS Fallback indicator), the eNB judges the switching type, if the switching type is intra-station switching, executes a second step, if the switching type is X2 switching, executes a third step, and if the switching type is S1 switching, executes a fourth step;
the second step is that: if the switching is in-station switching, judging the switching stage:
if the UE is in a handover preparation stage, directly canceling the handover, replying to the MME that the UE context is successfully modified, and preferentially executing a CS Fallback procedure;
if the UE is in a switching execution stage, caching a context modification request message of the CS Fallback, after the switching fails or the switching succeeds, fetching and caching the UE context modification request, replying the UE context modification success to the MME, and then executing a CS Fallback flow;
the third step: if the switching is X2 switching, judging the switching stage:
if the HANDOVER is in a HANDOVER preparation stage, the HANDOVER source side eNB directly sends a HANDOVER CANCEL (HANDOVER CANCEL) message to the HANDOVER target side eNB to CANCEL the HANDOVER, and replies a successful UE context modification to the MME, and preferentially executes a CS Fallback procedure;
if the UE is in a handover execution stage, a configurable timer (preferably a T304 timer) is started firstly, a UE context modification request message carrying a CS Fallback indicator is cached, if the UE fails to be switched, a source side eNB is reestablished, the timer is stopped, after the reestablishment is completed, the MME is replied to successfully modify the UE context according to the cached message, and a CS Fallback flow is started; if the reestablishment fails, replying a UE CONTEXT modification FAILURE (UE CONTEXT MODIFY FAILURE) message to the MME, carrying a corresponding reason value as X2 switching trigger, and leading the CSFB flow to fail; if the timer is overtime, replying a UE CONTEXT modification FAILURE (UE CONTEXT MODIFY FAILURE) message to the MME, carrying a reason value X2 switching trigger, and leading the CSFB flow to fail;
the fourth step: if the switching is S1, judging the switching stage:
if the UE is in a HANDOVER preparation stage, sending a HANDOVER CANCEL (HANDOVER CANCEL) message to the MME, canceling the HANDOVER, replying to the MME that the UE context is successfully modified, and preferentially executing a CS Fallback procedure;
if the UE is in a handover execution stage, a configurable timer (preferably a T304 timer) is started firstly, a UE context modification request message carrying a CS Fallback indicator is cached, if the UE fails to be switched, a source side eNB is reestablished, the timer is stopped, after reestablishment is completed, the message is cached, the MME is replied to the UE that the context modification is successful, and then a CS Fallback flow is started; if the reestablishment fails, replying a UE context modification failure message to the MME and carrying a corresponding cause value as an S1 handover trigger in the system, wherein the CSFB process fails; if the timer is overtime, a UE context modification failure message is replied to the MME and carries an S1 cause value as an in-system S1 handover trigger, and the CSFB process fails.
Example 2
This embodiment describes a device for performing voice fallback in a handover process according to the method of the embodiment, where the device is located at a base station on a source side of a handover, as shown in fig. 3, the device includes a determining module 10, an intra-site handover processing module 20, and an inter-site handover processing module 30, where:
the determining module 10 is configured to determine, after the handover source base station receives a message carrying a voice Fallback indicator (CS Fallback indicator), whether the type of the handover is intra-station handover or inter-station handover;
the intra-site handover processing module 20 is configured to, when the determining module 10 determines that the current handover is intra-site handover, directly cancel the current handover and execute a voice fallback procedure, or execute the voice fallback procedure after the handover fails or succeeds;
the inter-station handover processing module 30 is configured to, when the determining module 10 determines that the current handover is the inter-station handover, directly cancel the current handover, and execute a voice fallback procedure, or start a timer and cache the message, and within a timing time of the timer, if the handover fails and the source-side base station is reestablished, start the voice fallback procedure according to the cached message.
As shown in fig. 4, the intra-station handover processing module 20 includes a first judgment unit 201, a first handover preparation phase processing unit 202, and a first handover execution phase processing unit 203, wherein:
the first judging unit 201 is configured to judge whether the current state is in a handover preparation stage or a handover execution stage;
the first switching preparation stage processing unit 202 is configured to directly cancel the current switching and execute a voice fallback procedure when the first determining unit 201 determines that the current switching preparation stage is currently in the switching preparation stage,
the first switching execution stage processing unit 203 is configured to execute a voice fallback procedure after the first determining unit 201 determines that the current switching execution stage is to be executed and the switching is to be failed or successful.
As shown in fig. 5, the inter-station handover processing module 30 includes a second determining unit 301, a second handover preparation phase processing unit 302 and a second handover execution phase processing unit 303, where:
the second judging unit 301 is configured to judge whether the current state is in a handover preparation stage or a handover execution stage;
the second switching preparation stage processing unit 302 is configured to directly cancel the current switching when the second determining unit 301 determines that the current switching preparation stage is currently in the switching preparation stage, execute a voice fallback procedure,
the second handover execution stage processing unit 303 is configured to start a timer and buffer the message when the second determining unit 301 determines that the current handover execution stage is located, stop the timer if the source-side base station is reestablished in a handover failure within a timing time of the timer, and start a voice fallback procedure according to the buffered message.
Optionally, as shown in fig. 6, the inter-station handover processing module further includes a third determining unit 304, configured to determine whether the current handover is an X2handover or an S1 handover.
When the second determining unit 301 determines that the handover is currently in the handover preparation phase and the third determining unit 304 determines that the handover is an X2handover, the second handover preparation phase processing unit 302 sends a handover cancel message to the handover target base station, cancels the handover, and executes a voice fallback procedure.
When the second determining unit 301 determines that the handover is currently in the handover preparation phase and the third determining unit 304 determines that the current handover is S1 handover, the second handover preparation phase processing unit 302 sends a handover cancel message to the MME, cancels the current handover, and executes a voice fallback procedure.
The second handover execution stage processing unit 303 starts a timer and buffers the message when the second determining unit 301 determines that the current handover is the X2handover, stops the timer if the handover fails to reestablish the source base station within the timer, and sends a context modification success message to the MME according to the buffered message after completing reestablishment, so as to start a voice fallback procedure. Optionally, the second handover execution phase processing unit 303 is further configured to: when the source base station is reestablished in the handover failure, if reestablishment fails, a context modification failure message is replied to the MME, and the handover trigger is carried with a cause value of X2. Optionally, the second handover execution phase processing unit 303 is further configured to: when the timer is over, the context modification failure message is returned to the MME, and the reason value is carried as X2handover trigger.
The second handover execution stage processing unit 303 starts a timer and buffers the message when the second determining unit 301 determines that the current handover is the handover execution stage and the third determining unit 304 determines that the current handover is the S1 handover, stops the timer if the source base station is reestablished in a handover failure within a timer period, and after the reestablishment is completed, replies a context modification success message to the MME according to the buffered message and starts a voice fallback procedure. Optionally, the second handover execution phase processing unit 303 is further configured to: when the source base station is reestablished in the handover failure, if the reestablishment fails, a context modification failure message is replied to the MME, and the context modification failure message carries a cause value as an intra-system S1 handover trigger. Optionally, the second handover execution phase processing unit 303 is further configured to: and when the timer is over, replying a context modification failure message to the MME, and carrying a reason value as an intra-system S1 handover trigger.
The method of the above embodiment is explained below by way of an application example.
Application example 1:
this example is a processing procedure when the UE context modification request carrying the CS Fallback indicator is received in the intra-station handover preparation phase, as shown in fig. 7.
Step 201: the switching source Cell Cell1 of the eNB receives the measurement report of the UE and decides to execute the intra-site switching;
how to decide to execute the intra-site handover can be realized by adopting the prior art, and the invention is not described in detail.
Step 202: performing an intra-site handover preparation in a handover target Cell2 of the eNB, and performing a resource admission process of the handover preparation in a target Cell 2;
step 203: after receiving a UE context modification request message carrying a CS Fallback indicator triggered by an MME, a handover source Cell1 determines that the current UE is in a handover preparation stage in an eNB, and makes a decision to cancel the current handover first and preferentially execute a CS Fallback procedure;
step 204: cancel the handover preparation procedure of the intra-site handover target Cell 2;
step 205: the switching source Cell1 replies a context modification response message of the UE to the MME;
step 206: the switching source Cell Cell1 judges the voice fallback mode according to the UE capability information and the adjacent cells of the different systems and other information;
how to judge the voice fallback mode can be realized by adopting the prior art, and the invention is not described again.
Step 207: according to the CSFB decision result, the UE executes the redirection between systems, or CCO or PSHO;
step 208: after receiving the indication message corresponding to the voice fallback mode, the UE establishes the CS domain voice service in the GSM or UMTS system.
Application example 2:
this example is a processing procedure when the intra-station handover execution phase receives a UE context modification request carrying a CS Fallback indicator, as shown in fig. 8.
Step 301: the switching source Cell1, which receives the measurement report of the UE, decides to execute the in-station switching, completes the switching preparation after the target Cell2 completes the switching admission, and starts a waiting timer for completing the reconfiguration;
step 302: after the handover preparation is completed, the handover source Cell1 sends handover reconfiguration information to the UE, and triggers the UE to perform a random access process in the handover target Cell 2;
step 303: the switching source Cell1, after receiving the UE context modification request message carrying the CS Fallback triggered by the MME, determines that the current state is in the intra-eNB handover execution stage, and first buffers the UE context modification request message;
step 304 a: if the handover target Cell2 receives a handover complete message of the UE, that is, a handover reconfiguration complete message;
step 305 a: replying a context modification response message of the UE to the MME, and executing step 306;
step 304 b: if the eNB receives the UE reestablishment request message;
step 304b 1: the eNB cancels the current switching execution process in the station;
step 305b2, the UE and the eNB execute a reestablishment process;
step 305b 3: after the reconstruction is successful, taking a cached UE context modification request message carrying a CS Fallback indicator;
step 306: the switching source Cell Cell1 judges the voice fallback mode according to the UE capability information and the adjacent cells of the different systems and other information;
step 307: according to the CSFB decision result, the UE executes the redirection between systems, or CCO or PSHO;
step 308: after receiving the indication message corresponding to the voice fallback mode, the UE establishes the CS domain voice service in the GSM or UMTS system.
The present flow includes two different cases:
one of the cases includes steps 301-; in the handover execution phase of the intra-site handover, a UE context modification request carrying a CS Fallback indicator of the MME is received, the message is buffered, when the UE is successfully handed over to the target Cell2, the buffered message is fetched and the MME is replied that the UE context modification is successful, and then the CS Fallback procedure is executed.
Another case includes steps 301-; in the handover execution phase of the intra-site handover, a UE context modification request carrying a CS Fallback indicator is received from the MME, the message is buffered, when the UE handover fails, the UE is reestablished to the handover source Cell1 or the non-handover Cell of the eNB, the buffer is fetched, and the MME is replied that the UE context modification is successful, and then a CS Fallback procedure is executed.
Application example 3:
this example is a processing procedure when a UE context modification request carrying a CS Fallback indicator is received in an X2handover preparation phase, as shown in fig. 9.
Step 401: the eNB1 receives the measurement report of the UE, and the eNB1 decides to execute the X2 handover;
step 402: the eNB1, as the HANDOVER source side, sends a HANDOVER REQUEST (HANDOVER REQUEST) message to the HANDOVER target side eNB2, and performs an X2HANDOVER preparation procedure;
step 403: after receiving a UE context modification request message which is triggered by an MME and carries a CS Fallback indicator, the eNB1 judges that the UE context modification request message is currently in an X2handover preparation stage, and preferentially executes a CS Fallback flow;
step 404: cancel the handover preparation procedure of the handover target side eNB 2;
step 405: the eNB1 replies a context modification response message of the UE to the MME;
step 406: the eNB1 judges the voice fallback mode according to the UE capability information and the information such as the adjacent area of the different system;
step 407: according to the CSFB decision result, the UE executes the redirection between systems, or CCO or PSHO;
step 408: after receiving the indication message corresponding to the voice fallback mode, the UE establishes the CS domain voice service in the GSM or UMTS system.
Application example 4:
this example is a processing procedure when the X2handover execution phase receives a UE context modification request carrying a CS Fallback indicator, as shown in fig. 10.
Step 501: the eNB1 receives the UE measurement report, the eNB1 decides to execute X2HANDOVER, and sends a HANDOVER REQUEST (HANDOVER REQUEST) message to the target side eNB 2;
step 502: the eNB1 receives a HANDOVER REQUEST ACKNOWLEDGE (HANDOVER REQUEST ACKNOWLEDGE) message from the HANDOVER target eNB2, and issues a HANDOVER reconfiguration message to the UE, triggering the UE to perform a random access procedure on the HANDOVER target eNB 2;
step 503: after receiving a UE context modification request message which is triggered by an MME and carries a CS Fallback indicator, the eNB1 judges that the UE context modification request message is currently in an X2handover execution stage;
step 504: firstly, buffering a UE context modification request message carrying a CS Fallback indicator, and starting a T304 timer to wait for a UE handover failure to reestablish a source side eNB 1;
step 505 a: if the T304 timer is overtime, the eNB1 replies a UE context modification failure message to the MME, and the CS Fallback procedure fails;
step 505 b: if the timer is not overtime within the time of the T304 timer, the eNB1 receives a reestablishment request message of the UE and stops the timer firstly;
step 506 b: the eNB1 initiates a HANDOVER CANCEL (HANDOVER CANCEL) message to the HANDOVER target side eNB2, and then starts a reestablishment flow;
507 b: executing a reconstruction process;
step 508 c: if the UE fails to be reestablished, the eNB1 replies the MME that the UE context modification fails and carries the X2Handover triggered cause value, and the CS Fallback flow fails;
step 508 b: if the UE is successfully reestablished, the eNB1 replies the MME that the UE context is successfully modified, and then starts a CS Fallback procedure;
509 b: the eNB judges a voice fallback mode according to the UE capability information and information such as adjacent cells of the different systems;
step 510 b: according to the CSFB decision result, the UE executes the redirection between systems, or CCO or PSHO;
511 b: after receiving the indication message corresponding to the voice fallback mode, the UE establishes the CS domain voice service in the GSM or UMTS system.
The present flow includes three different situations,
one of the cases comprises steps 501-504, 505 a; in the execution stage of the inter-station X2Handover, after receiving a UE context modification request message which is triggered by an MME and carries a CS Fallback indicator, an eNB1 starts a T304 timer, caches the message, and when the timer is overtime, replies a UE context modification failure to the MME and carries a cause value of X2Handover triggered, and a CSFB flow fails;
one case includes steps 501-504, 505b, 506b, 507b, 508b, 509b, 510b, 511 b; in the execution stage of the inter-station X2handover, after receiving a UE context modification request message which is triggered by an MME and carries a CS Fallback indicator, an eNB1 starts a T304 timer first, then buffers the message, reestablishes a source side eNB after the UE handover fails within the timer time, stops the timer, and starts a CS Fallback procedure according to the buffered message and the success of UE context modification replied to the MME after completing reestablishment;
another case includes steps 501-504, 505b, 506b, 507b, 508 c; in the execution stage of the inter-station X2handover, after receiving a UE context modification request message carrying a CS Fallback indicator triggered by an MME, the eNB1 starts a T304 timer, and then buffers the message, reestablishes a UE handover failure to the source eNB within a timer time of the timer, stops the timer, and if the reestablishment failure occurs, replies a UE context modification failure to the MME and carries a corresponding cause value, and a CSFB procedure fails.
Application example 5:
this example is a processing procedure when a UE context modification request carrying a CS Fallback indicator is received in the S1 handover preparation phase, as shown in fig. 11.
Step 601: the eNB1 receives the measurement report of the UE, and the eNB1 decides to execute S1 switching;
step 602: the eNB1, as a HANDOVER source side, sends a HANDOVER request (HANDOVER requested) message to the MME to perform S1 HANDOVER preparation procedure;
step 603: after receiving a UE context modification request message which is triggered by an MME and carries a CS Fallback indicator, the eNB1 judges that the UE is currently in an S1 handover preparation stage, and preferentially executes a CS Fallback flow;
step 604: the eNB1 directly sends a HANDOVER CANCEL (HANDOVER CANCEL) message to the MME to CANCEL the HANDOVER preparation process of the HANDOVER target side eNB 2;
step 605: the eNB1 replies a context modification response message of the UE to the MME;
step 606: the eNB1 judges the voice fallback mode according to the UE capability information and the information such as the adjacent area of the different system;
step 607: according to the CSFB decision result, the UE executes the redirection between systems, or CCO or PSHO;
step 608: after receiving the indication message corresponding to the voice fallback mode, the UE establishes the CS domain voice service in the GSM or UMTS system.
Application example 6:
this example is a processing procedure when the S1 handover execution phase receives a UE context modification request carrying a CS Fallback indicator, as shown in fig. 12.
Step 701: the eNB1 receives the measurement report of the UE, the eNB1 decides to execute S1 HANDOVER, the eNB1 serves as a HANDOVER source side to send a HANDOVER request (HANDOVER REQUIRED) message to the MME, and S1 HANDOVER preparation process is carried out;
step 702: the eNB1 receives a HANDOVER COMMAND (HANDOVER COMMAND) message of the target MME, issues a HANDOVER reconfiguration message to the UE, and triggers the UE to perform a random access process at a HANDOVER target side eNB 2;
step 703: after receiving a UE context modification request message which is triggered by an MME and carries a CS Fallback indicator, the eNB1 judges that the UE context modification request message is currently in an S1 handover execution stage;
step 704: firstly, buffering a UE context modification request message carrying a CS Fallback indicator, and starting a T304 timer to wait for a UE handover failure to reestablish a source side eNB 1;
step 705 a: if the T304 timer is overtime, the eNB1 replies a UE context modification failure message to the MME, and the CS Fallback procedure fails;
step 705 b: if the timer is not overtime within the time of the T304 timer, the eNB1 receives a reestablishment request message of the UE and stops the timer firstly;
step 706 b: eNB1 initiates a HANDOVER CANCEL (HANDOVER CANCEL) message to MME first, and then starts a reestablishment flow;
step 707 b: executing a reconstruction process;
step 708 c: if the reestablishment fails, the eNB1 replies the MME that the UE context modification fails and the CS Fallback flow fails, wherein the UE context modification failure carries a cause value of S1intra system Handover triggered;
step 708 b: if the reestablishment is successful, the eNB1 replies the UE context to the MME first, and then the CS Fallback flow is started;
709 b: the eNB judges a voice fallback mode according to the UE capability information and information such as adjacent cells of the different systems;
step 710 b: according to the CSFB decision result, the UE executes the redirection between systems, or CCO or PSHO;
711 b: after receiving the indication message corresponding to the voice fallback mode, the UE establishes the CS domain voice service in the GSM or UMTS system.
The present flow includes three different situations,
one of the cases includes steps 701-704, 705 a; in the execution stage of S1 Handover between stations, after receiving a UE context modification request message triggered by an MME and carrying a CS Fallback indicator, eNB1 starts a T304 timer, and then buffers the message, and when the timer expires, returns to the MME that the UE context modification fails and the UE context modification carries a cause value of S1intra system handed over, and the CSFB procedure fails;
one case includes steps 701-704, 705b, 706b, 707b, 708b, 709b, 710b, 711 b; in the execution stage of S1 handover between stations, after receiving a UE context modification request message carrying a CS Fallback indicator triggered by an MME, the eNB1 starts a T304 timer first, and then buffers the message, and in the timer time of the timer, reestablishes the UE handover failure to the source eNB, stops the timer, and after completing reestablishment, according to the buffered message, and replies to the MME that the UE context modification is successful, starts a CS Fallback procedure;
another case includes steps 701-704, 705b, 706b, 707b, 708 c; in the execution stage of S1 handover between stations, after receiving a UE context modification request message carrying a CS Fallback indicator triggered by an MME, the eNB1 starts a T304 timer first, and then buffers the message, and in the timer time of the timer, reestablishes a UE handover failure to the source eNB, stops the timer, and if reestablishment failure occurs, returns a UE context modification failure and carries a corresponding cause value to the MME, and a CSFB procedure fails.
The method and the apparatus for fast voice fallback in the handover process in the embodiments of the present invention are only exemplified by an LTE communication system, but are not limited thereto.
It will be understood by those skilled in the art that all or part of the steps of the above methods may be implemented by instructing the relevant hardware through a program, and the program may be stored in a computer readable storage medium, such as a read-only memory, a magnetic or optical disk, and the like. Alternatively, all or part of the steps of the above embodiments may be implemented using one or more integrated circuits. Accordingly, each module/unit in the above embodiments may be implemented in the form of hardware, and may also be implemented in the form of a software functional module. Embodiments of the invention are not limited to any specific form of hardware or software combination.
Although the embodiments of the present invention have been described above, the above description is only for the convenience of understanding the present invention, and is not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (20)

1. A method for voice fallback in a handover process, comprising:
in the switching process, after receiving a message carrying a voice fallback indication, a base station at the switching source side judges whether the type of the switching is intra-station switching or inter-station switching;
if the switching is in-station switching, judging whether the current switching is in a switching preparation stage or a switching execution stage, and if the switching is in the switching preparation stage, directly canceling the switching and executing a voice fallback flow; if the switching execution stage is in, caching the message, and executing a voice fallback procedure according to the cached message after the switching failure or the switching success is waited;
if the switching is between the stations, judging whether the current switching is in a switching preparation stage or a switching execution stage, and if the switching is in the switching preparation stage, directly canceling the switching and executing a voice fallback flow; if the mobile terminal is in the switching execution stage, a timer is started and the message is cached, and within the timing time of the timer, if the switching fails, the source side base station is reestablished, and then the voice fallback flow is started according to the cached message.
2. The method of claim 1, wherein if the handover is an inter-station handover, the method further comprises: whether the switching is X2 switching or S1 switching is judged.
3. The method of claim 2,
if the switching is the X2 switching, the switching is directly cancelled, and the voice fallback process is executed, including: and sending a switching cancellation message to the base station at the switching target side, canceling the switching, and executing a voice fallback flow.
4. The method of claim 2,
if the switching is S1, the directly canceling the switching, and executing a voice fallback procedure includes: and sending a switching cancellation message to a Mobile Management Entity (MME), canceling the switching, and executing a voice fallback flow.
5. The method according to claim 2 or 3,
if the handover is the X2handover, the starting a timer and caching the message, and within the timer time of the timer, if the handover fails and the source-side base station is reestablished, stopping the timer, and then starting a voice fallback procedure according to the cached message, including:
starting a timer, caching the message, stopping the timer if the source base station is reestablished in a handover failure within the timing time of the timer, and after reestablishment is completed, replying a context modification success message to the MME according to the cached message, and starting a voice fallback procedure.
6. The method of claim 5,
if the source base station is reestablished in the handover failure, the method further comprises: if the reestablishment fails, a context modification failure message is replied to the MME and carries a cause value of X2handover trigger.
7. The method of claim 5, further comprising: if the timer is overtime, a context modification failure message is replied to MME and carries a cause value of X2handover trigger.
8. The method according to claim 2 or 4,
if the handover is S1 handover, the starting a timer and caching the message, and within the timer time of the timer, if the handover fails and the source-side base station is reestablished, stopping the timer, and then starting a voice fallback procedure according to the cached message, including:
starting a timer, caching the message, stopping the timer if the source base station is reestablished in a handover failure within the timing time of the timer, and after reestablishment is completed, replying a context modification success message to the MME according to the cached message, and starting a voice fallback procedure.
9. The method of claim 8,
if the source base station is reestablished in the handover failure, the method further comprises: if the reestablishment fails, a context modification failure message is replied to the MME, and the cause value is carried as an intra-system S1 handover trigger.
10. The method of claim 8, further comprising: if the timer is overtime, a context modification failure message is replied to the MME and carries a cause value as an intra-system S1 handover trigger.
11. A device for voice fall back in a switching process is positioned at a base station at the switching source side, and comprises a judging module, an intra-station switching processing module and an inter-station switching processing module, wherein:
the judging module is used for judging whether the type of the switching is intra-station switching or inter-station switching after the base station at the switching source side receives the message carrying the voice fallback indication in the switching process;
the in-station switching processing module is used for directly canceling the switching and executing the voice fallback flow when the judging module judges that the switching is in-station switching, or caching the message, and executing the voice fallback flow according to the cached message after the switching fails or the switching succeeds; wherein the in-station switching processing module comprises a first judging unit, a first switching preparation phase processing unit and a first switching execution phase processing unit,
the first judging unit is used for judging whether the current switching preparation stage or the switching execution stage is in;
the first switching preparation stage processing unit is used for directly canceling the switching and executing a voice fallback procedure when the first judging unit judges that the current switching preparation stage is in the switching preparation stage,
the first switching execution stage processing unit is used for caching the message when the first judging unit judges that the current switching execution stage is in the switching execution stage, and executing a voice fallback procedure according to the cached message after the switching is failed or the switching is successful;
the inter-station switching processing module is used for directly canceling the switching and executing a voice fallback procedure or starting a timer and caching the message when the judging module judges that the switching is the inter-station switching, and starting the voice fallback procedure according to the cached message if the switching fails and the source side base station is rebuilt within the timing time of the timer; the inter-station switching processing module comprises a second judging unit, a second switching preparation phase processing unit and a second switching execution phase processing unit, wherein:
the second judging unit is used for judging whether the current switching preparation stage or the switching execution stage is in;
the second switching preparation stage processing unit is used for directly canceling the switching and executing a voice falling process when the second judging unit judges that the current switching preparation stage is in the switching preparation stage,
and the second handover execution stage processing unit is configured to start a timer and cache the message when the second determining unit determines that the current handover execution stage is in the handover execution stage, stop the timer if the source base station is reestablished in a handover failure within a timer period, and start a voice fallback procedure according to the cached message.
12. The apparatus of claim 11,
the inter-station switching processing module further comprises a third judging unit for judging whether the switching is X2 switching or S1 switching.
13. The apparatus of claim 12,
the second switching preparation stage processing unit directly cancels the switching when the second judging unit judges that the current switching preparation stage is in the second switching preparation stage, and executes a voice fallback procedure, including:
when the second judgment unit judges that the current handover is the X2handover, the second handover preparation stage processing unit sends a handover cancel message to the handover target base station, cancels the current handover, and executes a voice fallback procedure.
14. The apparatus of claim 12,
the second switching preparation stage processing unit directly cancels the switching when the second judging unit judges that the current switching preparation stage is in the second switching preparation stage, and executes a voice fallback procedure, including:
when the second judging unit judges that the current handover is in the handover preparation stage and the third judging unit judges that the current handover is S1 handover, the second handover preparation stage processing unit sends a handover cancel message to the mobility management entity MME, cancels the current handover, and executes a voice fallback procedure.
15. The apparatus of claim 12 or 13,
the second handover execution phase processing unit starts a timer and caches the message, stops the timer if the source side base station is reestablished in a handover failure within a timer period, and starts a voice fallback procedure according to the cached message, including:
the second handover execution stage processing unit starts a timer and caches the message when the second judging unit judges that the current handover is the X2handover, stops the timer if the handover fails to reestablish the source base station within the timer, and replies a context modification success message to the MME according to the cached message after the reestablishment is completed, and starts a voice fallback procedure.
16. The apparatus of claim 15,
the second handover execution phase processing unit is further configured to: when the source base station is reestablished in the handover failure, if reestablishment fails, a context modification failure message is replied to the MME, and the handover trigger is carried with a cause value of X2.
17. The apparatus of claim 15,
the second handover execution phase processing unit is further configured to: when the timer is over, the context modification failure message is returned to the MME, and the reason value is carried as X2handover trigger.
18. The apparatus of claim 12 or 14,
the second handover execution phase processing unit starts a timer and caches the message, stops the timer if the source side base station is reestablished in a handover failure within a timer period, and starts a voice fallback procedure according to the cached message, including:
the second handover execution stage processing unit starts a timer and buffers the message when the second judging unit judges that the current handover is the handover execution stage, and the third judging unit judges that the current handover is the S1 handover, stops the timer if the source base station is reestablished in a handover failure within a timer period, and after the reestablishment is completed, replies a context modification success message to the MME according to the buffered message, and starts a voice fallback procedure.
19. The apparatus of claim 18,
the second handover execution phase processing unit is further configured to: when the source base station is reestablished in the handover failure, if the reestablishment fails, a context modification failure message is replied to the MME, and the context modification failure message carries a cause value as an intra-system S1 handover trigger.
20. The apparatus of claim 18,
the second handover execution phase processing unit is further configured to: and when the timer is over, replying a context modification failure message to the MME, and carrying a reason value as an intra-system S1 handover trigger.
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