CN108738095A

CN108738095A - The method of data forwarding and base station in a kind of handoff procedure

Info

Publication number: CN108738095A
Application number: CN201710267738.8A
Authority: CN
Inventors: 路杨; 周明宇
Original assignee: Baicells Technologies Co Ltd
Current assignee: Baicells Technologies Co Ltd
Priority date: 2017-04-21
Filing date: 2017-04-21
Publication date: 2018-11-02
Also published as: WO2018192354A1

Abstract

The present invention provides the method for data forwarding and base station in a kind of handoff procedure, the method includes：The first base station of user terminal UE access judges whether the switching state of the UE meets the first trigger condition after sending automatic switchover information to the UE；If the switching state of the UE meets first trigger condition, the first base station stops the upstream data for sending the downlink data of the UE to the UE and/or stopping sending the UE to core net；The upstream data of the UE and/or downlink data are forwarded to the second base station by the first base station, wherein second base station includes the target BS belonging to the Target cell of the candidate base station or UE automatic switchovers belonging to the candidate cell that the UE automatically switches.In this way, the forward shifting method in handoff procedure provided by the invention can effectively reduce the expense of X2 interface, the expense of data forwarding resource is saved.

Description

The method of data forwarding and base station in a kind of handoff procedure

Technical field

The present invention relates to field of communication technology, more particularly to the method for data forwarding and base station in a kind of handoff procedure.

Background technology

MulteFire is a kind of wireless access technology that LTE is expanded to unauthorized frequency range, unauthorized frequency range in the technology Carrier wave can not separately provide service by the carrier wave of authorized spectrum band.MulteFire systems support UE (User Equipment, User terminal) automatically switched, i.e. the channel quality of the detection present access subzones UE and adjacent cell can when meeting switching condition The Target cell is accessed to initiate random access from trend Target cell, and without until receiving cutting for present access subzone Order is changed just to switch over.

If according to traditional approach, the source base station of UE access can complete switching standard in the measurement report reported according to the UE The uplink/downlink data of UE described in base station forward belonging to the standby candidate cell automatically switched backward.However, due in handoff procedure In, the source base station of the UE access does not know whether the UE can be automatically switched, if after completing switching and preparing immediately The uplink/downlink data of UE described in base station forward belonging to candidate cell to automatic switchover, are easy to cause larger X2 interface (base Interconnection interface between standing) expense.As it can be seen that be easy to causeing data using existing data forwarding method in automatic switching procedure The waste of transfer resource.

Invention content

The purpose of the present invention is to provide a kind of method of data forwarding in handoff procedure and base stations, to solve cutting automatically The problem of waste of data transmission resources being be easy to cause during changing using existing data forwarding method.

According to the present invention in a first aspect, the method for providing data forwarding in a kind of handoff procedure, the method includes： The first base station of user terminal UE access judges whether the switching state of the UE is full after sending automatic switchover information to the UE The first trigger condition of foot；If the switching state of the UE meets first trigger condition, the first base station stops to described UE sends the downlink data of the UE and/or stops sending the upstream data of the UE to core net；The first base station is by institute It states the upstream data of UE and/or downlink data is forwarded to the second base station, wherein second base station includes that the UE automatically switches Candidate cell belonging to candidate base station or the UE automatically switch Target cell belonging to target BS.

Second aspect according to the present invention additionally provides a kind of base station, and the base station is the first base station of user terminal access, The first base station includes processor, transceiver, memory, user interface and network interface, and the processor is used for：To institute It states after UE sends automatic switchover information and judges whether the switching state of the UE meets the first trigger condition；If the switching of the UE State meets first trigger condition, stops sending the downlink data of the UE to the UE and/or stops sending out to core net Send the upstream data of the UE；The upstream data of the UE and/or downlink data are forwarded to the second base station, wherein described Two base stations include the Target cell institute of the candidate base station or UE automatic switchovers belonging to the candidate cell that the UE automatically switches The target BS of category.

The above-mentioned technical proposal of the present invention at least has the advantages that：

The first base station of user terminal UE access judges the switching shape of the UE after sending automatic switchover information to the UE Whether state meets the first trigger condition；If the switching state of the UE meets first trigger condition, the first base station is stopped Only the downlink data of the UE is sent to the UE and/or stop sending the upstream data of the UE to core net；Described first The upstream data of the UE and/or downlink data are forwarded to the second base station by base station, wherein second base station includes the UE The target BS belonging to Target cell that candidate base station or the UE belonging to the candidate cell of automatic switchover automatically switch.This Sample, the forward shifting method in handoff procedure provided by the invention can effectively reduce the expense of X2 interface, save data forwarding resource Expense.

Description of the drawings

Fig. 1 is a kind of flow diagram that UE is switched over provided in an embodiment of the present invention；

Fig. 2 is the flow diagram of the method for data forwarding in a kind of handoff procedure provided in an embodiment of the present invention；

Fig. 3 is a kind of switching flow schematic diagram of automatic switchover provided in an embodiment of the present invention；

Fig. 4 is another switching flow schematic diagram automatically switched provided in an embodiment of the present invention；

Fig. 5 is a kind of structural schematic diagram of base station provided in an embodiment of the present invention.

Specific implementation mode

Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete Site preparation describes, it is clear that described embodiments are some of the embodiments of the present invention, instead of all the embodiments.Based on this hair Embodiment in bright, the every other reality that those of ordinary skill in the art are obtained under the premise of not making the creative labor Example is applied, shall fall within the protection scope of the present invention.

MulteFire (hereinafter referred MF) is a kind of wireless access technology that LTE is expanded to unauthorized frequency range, the technology In unauthorized frequency range carrier wave service can not be separately provided by authorized spectrum band carrier wave.In order to other in unauthorized frequency range equipment (such as WiFi equipment) is fair to be occupied unauthorized band channels and avoids interfering with each other between unauthorized frequency range equipment, MF physical layers Introduce LBT (Listen Before Talk, listem-before-talk) mechanism of the carrier sense technology of similar WiFi.It is supervised in base station or UE When hearing that unauthorized band channels are occupied, i.e. when LBT fails, stop sending signal；When base station or UE listen to channel idle When, i.e. signal is just sent when LBT is successful.

In order to improve the downlink common control signal efficiency of transmission of base station under LBT mechanism, MulteFire introduces discovery ginseng Signal (Discovery Reference Signal, DRS) is examined, it is wide that DRS contains main downlink common control signal, system Broadcast, primary synchronization signal (Primary Sync Signal, PSS), secondary synchronization signal (Secondary Sync Signal, SSS), Enhance primary synchronization signal (enhanced Primary Sync Signal, ePSS), enhancing secondary synchronization signal (enhanced Secondary Sync Signal, eSSS), cell reference signals (Cell Reference Signal, CRS), main system letter Cease system information block (the System Information Block of block (Master Information Block, MIB) and enhancing Multefire, SIB-MF).DRS occupies 12 or 14 symbols (Symbol) in a downlink subframe.UE can have found The signal measurement time configures (Discovery Signals Measurement Timing Configuration, DMTC) window Interior reception DRS is to carry out down-going synchronous, receive MIB and SIB-MF.MF cells only DRS subframes or other have physical down total The subframe for enjoying channel (Physical Downlink Shared Channel, PDSCH) transmission sends CRS.

Refering to fig. 1, Fig. 1 is a kind of flow diagram that UE is switched over, traditional switching part as shown in Figure 1, described UE is detecting that, to the first base station transmission measurement report being currently accessed, the first base station receives when meeting switching condition It needs the second base station belonging to the Target cell being switched to send switching to the UE after the measurement report that the UE is sent to prepare Request, second base station switches over preparation according to the handover preparation request, and sends switching standard to the first base station Standby response.The first base station receives be ready to respond to rear of switching and sends traditional switching command, the UE to the UE Cell switching is carried out according to traditional switching command.

A kind of UE is supported to automatically switch mechanism in MulteFire systems, as shown in Figure 1, being currently accessed when UE is detected When the channel quality of cell and adjacent cell meets switching condition, starts and automatically switch timer and to belonging to the cell being currently accessed First base station reporting measurement reports, the first base station after receiving the measurement report to the UE automatically switch time Select the second base station belonging to cell send automatically switch preparation request (to second base station send the UE context and It is that the UE reserves resource to ask second base station), second base station receives after the automatic switchover preparation request Automatic switchover preparation is carried out, and is sent to the first base station after completing to automatically switch to prepare and automatically switches to be ready to respond to, institute It states first base station and receives to send to the UE after the automatic switchover is ready to respond to and automatically switch to prepare message.It needs to illustrate It is that in the switching flow figure shown in Fig. 1, following FIG. 3 and Fig. 4, the measurement report that the UE is sent for the first time is to be directed to Automatically switch the measurement report prepared, second of measurement report sent is for the measurement report automatically switched.

The UE detect automatically switch measurement object signal quality meet automatically switch measurement report condition when, Measurement report is sent to the first base station and opens automatic switchover timer, part as indicated by a broken line in fig. 1, due to the UE Sending measurement report to the first base station may succeed and may also fail, and traditional switching preparation may be completed not have It completes, therefore makes to be represented by dashed line in Fig. 1.If the first base station is properly received the measurement report that the UE is sent, described the One base station is that the UE switches over preparation, and sends traditional switching command to the UE after preparation according to traditional mode. If receiving traditional switching command that the first base station is sent before the automatic switchover timer expiry of the UE, the UE It can be switched over according to conventional handover procedure, if the first base station does not have also after the automatic switchover timer expiry of the UE The oriented UE sends traditional switching command, and the UE, which starts, automatically switches flow, that is, the target automatically switched is small Area selects, and is then linked into the Target cell of automatic switchover.

Automatically switch mechanism based on above-mentioned UE, the method that the present invention provides data forwarding in a kind of handoff procedure below will The present invention will be described in detail in conjunction with specific embodiments.

It should be noted that in embodiments of the present invention, the UE can be mobile phone (or mobile phone) or other energy The enough equipment sent or receive wireless signal, including user equipment (terminal), personal digital assistant (PDA), wireless modulation-demodulation Device, wireless communication device, hand-held device, laptop computer, wireless phone, wireless local loop (WLL) stand, can be by movement Signal is converted to the CPE (Customer Premise Equipment, customer terminal equipment) or intelligent movable heat of WiFi signal Point, intelligent appliance or other obstructed remarkable operations can the spontaneous equipment etc. communicated with mobile communications network.

The form of the base station is unlimited, can be macro base station (Macro Base Station), micro-base station (Pico Base Station), Node B (address of the mobile base stations 3G), enhanced base station (ENB), family's enhanced base station (Femto eNB or Home eNode B or Home eNB or HNEB), relay station, access point, RRU (Remote Radio Unit, far end radio frequency mould Block), RRH (Remote Radio Head, remote radio head) etc..

First embodiment

It is the flow signal of the method for data forwarding in a kind of handoff procedure provided in an embodiment of the present invention referring to Fig. 2, Fig. 2 Figure, the executive agent of the method can be the source base station of UE access (first base station i.e. shown in Fig. 2), as shown in Figure 1, institute The method of stating includes the following steps：

Step 201, the first base station of user terminal UE access judge the UE after sending automatic switchover information to the UE Switching state whether meet the first trigger condition.

If the switching state of step 202, the UE meets first trigger condition, the first base station stops to described UE sends the downlink data of the UE and/or stops sending the upstream data of the UE to core net.

The upstream data of the UE and/or downlink data are forwarded to the second base station by step 203, the first base station, In, second base station includes the mesh of the candidate base station or UE automatic switchovers belonging to the candidate cell that the UE automatically switches Mark the target BS belonging to cell.

In the embodiment, the first base station that UE is currently accessed judges institute after sending automatic switchover preparation message to the UE Whether the switching state for stating UE meets the first trigger condition, if the switching state of the UE meets first trigger condition, institute It states first base station and stops the upper line number for sending the downlink data of the UE to the UE and/or stopping sending the UE to core net According to.The upstream data of the UE and/or downlink data are forwarded to the second base station by the first base station, wherein second base It stands belonging to the Target cell that the candidate base station belonging to the candidate cell automatically switched including the UE or the UE automatically switch Target BS.

The first base station complete automatically switch set-up procedure it is rear to the UE send automatically switch information, and to The UE judges whether the switching state of the UE meets the first trigger condition after sending the automatic switchover information.Described One trigger condition may include that the first base station can determine described in the condition that the UE can be automatically switched or determination The condition of automatic switchover has been carried out in UE, can also include other conditions.

Specifically, first trigger condition may include the automatic switchover timer expiry of the UE and first base It stands and sends switching command to the UE not successfully.First trigger condition can also receive described including the first base station The measurement report for automatic switchover that the UE is sent is asked or received to the data forwarding of second base station.Described first touches Clockwork spring part can also include that the first base station does not receive in the first preset time after sending downlink data to the UE The upstream data of the UE is not received by the second preset time to confirmation message or the first base station.

When the switching state of the UE meets first trigger condition, the first base station stops sending to the UE The downlink data of the UE and/or the upstream data for stopping sending the UE to core net.In the step, when the switching of the UE When state meets first trigger condition, the first base station stops sending under the UE from core net to the UE Row data and/or stop to core net send the upstream data from the UE.

The upstream data of the UE and/or downlink data are forwarded to second base station by the first base station.Described Two base stations may include the candidate base station belonging to all candidate cells that the UE automatically switches, and can also include only described The candidate base station belonging to Target cell that UE automatically switches.It is understood that the target that the UE is finally automatically switched Cell may belong to the candidate cell that the UE automatically switches, and can not also belong to the candidate cell that the UE automatically switches.Tool Body, when the first base station can determine the Target cell that the UE automatically switches, second base station can only include The target BS belonging to Target cell that the UE automatically switches；When the first base station can not determine that the UE automatically switches Target cell when, second base station includes the candidate base station belonging to all candidate cells that the UE automatically switches.

The first base station can stop sending the downlink data of the UE to the UE and/or stop sending out to core net The upstream data and/or downlink data of the UE that caching receives while the upstream data of the UE are sent, and will be described slow The UE upstream datas and/or downlink data deposited are forwarded to second base station.It can also stop sending institute to the UE It states the downlink data of UE and/or stops sending the upstream data of the UE to core net and cache the upper of the UE received before Then row data and/or downlink data are stopping sending the downlink data of the UE to the UE and/or are stopping sending out to core net After the upstream data for sending the UE, the upstream data and/or downlink of the UE of the caching are sent to second base station Data.

The first base station stops sending the downlink data of the UE to the UE and/or stop to described in core net transmission The upstream data of UE may include：Stop sending non-acknowledgement UM patterns to the UE or confirms the downlink data of AM patterns, and Stop sending from described to core net after sending the upstream data from the UE being properly received in order to core net The AM pattern upstream datas of UE, and delete the uplink and downlink RLC (Radio Link Control, nothing of remaining AM patterns Link-layer controls) layer data.

The upstream data and/or downlink data of the UE of first base station caching may include UE hairs described in warp-wise It send but not by the downlink data of the UE AM patterns being properly received；And/or core net send and the first base station also not The downlink data of the AM patterns or UM patterns that are sent to the UE；And/or the upper line number of the out of order AM patterns of the UE transmissions According to.

Optionally, first trigger condition include the UE automatic switchover timer expiry and the first base station not Success sends switching command to the UE.

In the embodiment, first trigger condition includes the automatic switchover timer expiry of the UE and first base It stands and sends switching command to the UE not successfully.It is a kind of cutting for automatic switchover provided in an embodiment of the present invention refering to Fig. 3, Fig. 3 Flow diagram is changed, as shown in figure 3, if when the automatic switchover timer expiry of the UE, the first base station is not yet Switching command is sent to the UE, the first base station can determine that the UE can be automatically switched, at this time first base It stands and stops sending the upstream data of the UE and/or downlink data and turn the upstream data of the UE and/or downlink data Issue second base station.In this way, the first base station carries out data in the case where determining that the UE can be automatically switched Forward can avoid the data forwarding of mistake from (such as capable of avoiding the data carried out in the case where UE is not automatically switched Forward), and the expense that premature data forwarding can be avoided to lead to X2 interface is excessive.

The first base station judge the UE automatic switchover timer whether time-out mode can be by judging whether The automatic switchover timer expiry information that the UE is sent is received to judge, it can also be fixed by obtaining the automatic switchover of the UE When device the startup time and timing length, then judge that the automatic of the UE cuts according to the startup time and timing length Whether overtime change timer.

In some embodiments of the invention, if the first base station is gone back in the automatic switchover timer expiry of the UE Switching command is sent to the UE not successfully, and the first base station has been carried out traditional switching and prepares, described at this time the One base station also needs to the base station belonging to the candidate cell to tradition switching and sends handover cancelling request, for asking the tradition to be cut The base station belonging to candidate cell changed is released to the resource that the UE prepares.

If the first base station has succeeded to send to the UE before the automatic switchover timer expiry of the UE and switch Order, then the UE can carry out traditional switching, automatically switch without starting.The first base station is sent out to the UE at this time Switching command is sent to stop sending the downlink data of the UE to the UE and/or stop sending the upper of the UE to core net later Row data, while the downlink data of the UE from core net and/or the upstream data from the UE are cached, then to biography Base station belonging to the Target cell of system switching sends the upstream data and/or downlink data of the UE of the caching.In addition, In the case of determining that the UE will execute tradition switching, time that the first base station can be belonging to from the candidate cell to automatic switchover Base station is selected to send handover cancelling request, it is described for asking the candidate base station belonging to the candidate cell of the automatic switchover to be released to The resource that UE prepares.

It should be noted that first trigger condition is the automatic switchover timer expiry of the UE and first base It stands and is only limitted to judge that the UE's is automatic in the first base station to the embodiment of UE transmission switching commands not successfully It is executed in the case that whether timer is overtime.

Optionally, the first base station judge the UE automatic switchover timer whether time-out mode include：

The first base station judges whether to receive the automatic switchover timer expiry information that the UE is sent；Or

The first base station determines that the automatic of the UE cuts according to what the UE was sent for the measurement report automatically switched Startup time and the timing length of timer are changed, and judges that the UE's is automatic according to the startup time and timing length Whether switching timer is overtime.

It should be noted that above-mentioned first base station judges that whether overtime the automatic switchover timer of the UE mode be applicable It is sent out not successfully to the UE in the automatic switchover timer expiry and the first base station that first trigger condition is the UE Send switching command.

In some embodiment of the invention, the UE can be in the case where automatically switching timer expiry to described first Base station, which is sent, automatically switches timer expiry information, and in the case of this kind, the first base station can be by judging whether to receive The automatic switchover timer expiry information of the UE judges whether the automatic switchover timer of the UE is overtime.Specifically, if institute The automatic switchover timer expiry information that first base station receives the UE is stated, the first base station determines that the automatic of the UE cuts Change timer expiry；If on the contrary, the first base station is not received by the automatic switchover timer expiry information of the UE, institute It states first base station and determines that the automatic switchover timer of the UE is not timed-out.

In other embodiments of the present invention, the UE is sent to the first base station for the measurement report automatically switched When can be carried in the measurement report UE automatic switchover timer timing length.In the case of this kind, described One base station can determine the startup time of the automatic switchover timer of the UE and be determined according to the UE measurement reports sent Then Shi Shichang judges whether the automatic switchover timer of the UE is overtime, example according to the startup time and timing length Whether the automatic switchover timer of UE as described in the first base station can be estimated according to the startup time and timing length Time-out.

It can carry the UE's in the measurement report for automatic switchover that the UE is sent to the first base station The startup time for automatically switching timer can not also carry the startup time of the automatic switchover timer of the UE.Accordingly, If the startup time for the automatic switchover timer for carrying the UE in the measurement report automatically switched that the UE is sent, When the first base station in the measurement report automatically switched directly from described for the startup for automatically switching timer is obtained Between；If the startup for the automatic switchover timer for not carrying the UE in the measurement report automatically switched that the UE is sent Time, the first base station can automatically be cut according to receiving described in the time estimation for the measurement report automatically switched Change the startup time of timer, for example, directly determine receive the time for the measurement report automatically switched be it is described from Before the startup time of dynamic switching timer or the time for determining the measurement report for automatic switchover received It is sometime the startup time for automatically switching timer.

It is understood that can not also carry the UE's in the measurement report for automatic switchover that the UE is sent Automatically switch the timing length of timer, the first base station can be using the timing length obtained in advance as the automatic of the UE The timing length of switching timer.

Optionally, first trigger condition includes：

The first base station receives the data forwarding request that second base station is sent；Or

The first base station is not received by confirmation in the first preset time after sending downlink data to the UE and disappears Breath or the first base station are not received by the upstream data of the UE in the second preset time；Or

The first base station receives the measurement report for automatic switchover that the UE is sent.

In the embodiment, first trigger condition can be that the first base station receives second base station and sends Request of data can also be that the first base station does not receive in the first preset time after sending downlink data to the UE The upstream data of the UE is not received by the second preset time to confirmation message or the first base station, can also be The first base station receives the measurement report for automatic switchover that the UE is sent.

In some embodiment of the invention, second base station can be to the first base station transmission data forwarding request, institute Stating first base station can determine that the switching state of the UE meets when receiving the data forwarding request that second base station is sent First trigger condition, and trigger the first base station and carry out data forwarding flow.Specifically, when second base station includes When candidate base station belonging to the candidate cell that the UE is automatically switched, second base station can receive described first Base station is sent automatically switch preparation request after send data forwarding request to the first base station and (such as pass through automatic switchover It is ready to respond to send the data forwarding request to the first base station).When second base station includes only that the UE is carried out When target BS belonging to the Target cell of automatic switchover, second base station can be successfully accessed in the UE and described cut automatically The data forwarding request is sent to the first base station after the Target cell changed, as shown in Figure 4.Only for second base station When only including the target BS belonging to the Target cells that are automatically switched of the UE, data forwarding method of the invention can be kept away Exempt from the waste of the communication resource caused by the target BS forwarding data belonging to other non-targeted cells.Second base station can It is asked with sending the data forwarding by dedicated X2 message, the data forwarding can also be sent by existing X2 message It asks (such as the context release message for passing through the UE).

In an embodiment of the present invention, the method further includes step：The first base station receives the second base station hair The forward link configuration information sent, the first base station connect according to the forward link configuration information to second base station forwarding The upstream data and/or downlink data of the UE received.The forward link configuration information, which can imply, indicates the forward Request of data (the i.e. described forward link configuration information can be defaulted as forwarding data request), can not also imply before indicating described Turn request of data, is specifically dependent upon making an appointment for the first base station and second base station.It should be noted that described Two base stations first base station transmission forward described in the forward direction for sending the forwarding data request to the first base station Link configuration information (such as by automatically switching to be ready to respond to send forward link configuration information to the first base station), also may be used Matched with sending the forward link to the first base station while sending the forwarding data request to the first base station Confidence ceases, and the present invention is not specifically limited this.

Specifically, for example, the second base station is ready to respond to match to first base station transmission forward link by automatically switching When confidence ceases, the second base station includes the candidate base station belonging to the candidate cell that the UE is automatically switched, the forward link Configuration information, which can imply, indicates forwarding data request, and first base station is to the second base station forwarding data；When UE access second The second base station sends forwarding data request, second base station by UE contexts release message to second base station behind base station The target BS belonging to Target cell only automatically switched including the UE, second base station can be on by UE The forward link configuration information implicit expression forwarding data request for including in release message hereafter.

In other embodiments of the invention, such as the autotimer of the UE can not be accurately known for first base station Whether the situation of time-out, first trigger condition may include the first base station after sending downlink data to the UE It is not received by confirmation message in first preset time or the first base station is not received by institute in the second preset time State the upstream data of UE；Or the first base station receives the measurement report for automatic switchover that the UE is sent.It is described First base station can not accurately know the UE automatic switchover timer whether the situation of time-out can be the first base station without Method determines the timing cases for automatically switching timer or described according to the measurement report for automatic switchover that the UE is sent First base station does not receive the measurement report for being directed to automatic switchover that the UE is sent or the UE not to the first base station It sends for the measurement report automatically switched.Such as the UE can not be successfully transmitted during automatically switching timer timing and be directed to The measurement report of automatic switchover or UE transmissions reach maximum RLC number of retransmissions for the measurement report automatically switched and lead Cause the first base station that cannot receive the case where UE is for the measurement report automatically switched.In another example working as the first base station When the automatic switchover timer length of the UE is configured to 0, the UE can not be sent for the measurement report automatically switched, The case where thus causing the first base station that can not receive the measurement report of the UE.

Described in being not received by the first preset time after sending downlink data to the UE when the first base station UE is directed to the confirmation message (such as ack message) of the downlink data, or the core being not received by the second preset time In the case of the downlink data for netting the UE sent, the first base station may determine that the UE may have been carried out automatically Switching, to trigger the data forwarding process of the automatic switchover.It is understood that the first base station can also receive When to UE transmissions for the measurement report automatically switched, the data forwarding process of the automatic switchover is triggered.

Optionally, the method further includes：

The first base station receives the forward link configuration information that second base station is sent；

The upstream data of the UE and/or downlink data are forwarded to the second base station by the first base station, including：

The first base station turns the upstream data of the UE and/or downlink data according to the forward link configuration information It is dealt into second base station.

In the embodiment, the first base station also receives the forward link configuration information that second base station is sent, described The upstream data of the UE and/or downlink data are forwarded to described second by first base station according to the forward link configuration information Base station.It is understood that when first trigger condition is the number that the first base station receives that second base station is sent When according to forwarding request, the first base station can be the described in the forward direction for sending the data forwarding request to second base station One base station sends the forward link configuration information, can also send the same of the data forwarding request to second base station When to the first base station send the forward link configuration information.

Optionally, the first base station stops sending the downlink data of the UE to the UE and/or stop to core net The upstream data of the UE is sent, including：

The first base station stops sending the downlink data of the UE to the UE and/or stop to described in core net transmission The upstream data of UE and the upstream data and/or downlink data for caching the UE；

The upstream data of the UE of the caching and/or downlink data are transmitted to second base by the first base station It stands.

In the embodiment, the first base station stop to the UE send the downlink data of the UE and/or stop to The upstream data and/or upstream data of the UE received, institute are cached while core net sends the upstream data of the UE It states first base station the upstream data of the UE and/or downlink data is forwarded to second base station and specifically include：Described first The upstream data of the UE of the caching and/or downlink data are transmitted to second base station by base station.

Optionally, the first base station stops sending the downlink data of the UE to the UE and/or stop to core net Before the upstream data for sending the UE, the method further includes：

First base station judges whether the switching state of the UE meets the second trigger condition；

If the switching state of the UE meets second trigger condition, the first base station caches the lower line number of the UE According to and/or upstream data；

In the embodiment, the first base station is not to stop sending the downlink data of the UE to the UE and/or stop The downlink data of the UE received and/or upper line number are cached while only sending the upstream data of the UE to core net According to, but stopping sending the downlink data of the UE to the UE and/or stopping sending the upper line number of the UE to core net According to judging whether the switching state of the UE meets the second trigger condition before, and described in meeting in the switching state of the UE Start the downlink data and/or upstream data of the UE that caching receives in the case of second trigger condition.

Second trigger condition may include：The automatic switchover that the first base station completes the UE prepares；Or institute It states first base station and is not received by confirmation message or described in the first preset time after sending downlink data to the UE First base station is not received by the upstream data of the UE in the second preset time；Or the first base station receive it is described The measurement report for automatic switchover that UE is sent.

It is understood that the UE upstream datas and/or downlink data that the first base station caching receives are in institute It states first base station and stops the upper line number for sending the downlink data of the UE to the UE and/or stopping sending the UE to core net According to the step of before occur, or occur simultaneously.

Optionally, second trigger condition includes：

The automatic switchover that the first base station completes the UE prepares；Or

It is in the case of at the time of the first base station can not determine the automatic switchover timer expiry of the UE, i.e., described In the case that first base station can not determine at the time of the UE starts to automatically switch to Target cell, the first base station stop to The UE when sending the downlink data of the UE UE may have been switched to Target cell, thus the UE can nothing Method receives the downlink data for the UM patterns that the first base station is sent, if not cache the UE failed for the first base station The downlink data of the UM patterns of reception, it will cause the loss of the downlink data of UM patterns.Therefore in the embodiment, described first Base station judges whether the switching state of the UE meets second and touch before the downlink data for stopping sending the UE to the UE Clockwork spring part, and cache in the case of the switching state of the UE upstream data and/or downlink data of the UE, i.e., described UE is slow before stopping sending the downlink data of the UE to the UE and/or stopping the upstream data for sending the UE to core net The upstream data and/or downlink data of the UE are deposited, in such manner, it is possible to effectively avoid the loss of data.

In the embodiment, second trigger condition can be the automatic switchover standard that the first base station completes the UE It is standby, can also be that the first base station is not received by confirmation in the first preset time after sending downlink data to the UE Message, for example, rlc layer ARQ Ack (Automatic Repeat reQuest Acknowledgement, automatic repeat request Confirm) or MAC (Media Access Control) layer HARQ Ack (Hybrid Automatic Repeat reQuest Acknowledgement, hybrid automatic repeat-request confirm) or the first base station do not received in the second preset time To the upstream data of the UE, it can also be that the first base station receives the measurement report for automatic switchover that the UE is sent It accuses.

The first base station stops sending non-acknowledgement UM patterns to the UE or confirms the downlink data of AM patterns, and/or Stop sending from described to core net after sending the upstream data from the UE being properly received in order to core net The AM pattern upstream datas of UE；

The first base station deletes the uplink and/or down wireless link control rlc layer data of remaining AM patterns.

In the embodiment, the downlink data that the UE stops sending the UE to the UE specifically includes the first base station Stop sending the downlink data of UM patterns or AM patterns to the UE, and deletes the remaining AM moulds sent not yet to the UE The downlink rlc layer data of formula.The upstream data that the UE stops sending the UE to core net specifically includes the first base station Stop sending from described to core net after sending the upstream data from the UE being properly received in order to core net The AM pattern upstream datas of UE, and delete the uplink rlc layer data of the remaining AM patterns sent not yet to core net.

For the AM pattern upstream datas that the UE that the first base station receives is sent, if without succeeding in order It receives, is then sent without normal direction core net, therefore the first base station comes from institute what is be properly received in order to core net transmission The upstream data for stating UE just stops sending the AM pattern upstream datas from the UE to core net later.

It should be noted that since MAC layer includes the upstream data and/or downlink data of the residue AM patterns, The first base station deletes the uplink of remaining AM patterns and/or downlink rlc layer data will not cause the AM upstream datas and/ Or the loss of downlink data, and the resource overhead of data forwarding can be effectively saved, improve the efficiency of data forwarding.

Optionally, the first base station caches the upstream data and/or downlink data of the UE, including：

The first base station caches UE described in warp-wise and sends but not by the lower line number of the UE AM patterns being properly received According to；And/or

AM patterns that the first base station that first base station caching core net is sent and described is not sent to the UE also or The downlink data of UM patterns；And/or

The first base station caches the upstream data for the out of order AM patterns that the UE is sent.

In the embodiment, the downlink data that the first base station caches the UE may include caching UE hairs described in warp-wise It send but not by the downlink data of the UE AM patterns being properly received, and/or caching core net is sending and the first base station The downlink data of the AM patterns or UM patterns that are not sent to the UE also.For the downlink of the AM patterns sent of UE described in warp-wise Data, the first base station can be by judging whether to be properly received the lower line number determined whether to the AM patterns by the UE According to being cached.Specifically, for UE described in the first base station warp-wise, but the AM patterns that the UE is not properly received Downlink data, the first base station caches the downlink data, so as to effectively prevent the downlink data to lose.

The upstream data that the first base station caches the UE may include the UE that the caching first base station receives The upstream data of the out of order AM patterns sent.It is understood that being sent for the UE that the first base station receives Out of order AM patterns upstream data, since the first base station is not properly received in order, no normal direction core net is sent, Therefore, the first base station caches the upstream data for the out of order AM patterns that the UE is sent, and avoids the loss of the upstream data. In addition, when the upstream data of the pattern of the out of order AM is sent to the second base station by the first base station, in this way, working as the UE It the cell that is successfully accessed under second base station and is lacked in the upstream data for receiving the out of order AM patterns that the UE is sent When the upstream data for other AM patterns lost, the upstream data of the AM patterns of complete sequence can be sent to by second base station Core net.

In the present embodiment, the first base station of user terminal UE access judges institute after sending automatic switchover information to the UE Whether the switching state for stating UE meets the first trigger condition；If the switching state of the UE meets first trigger condition, institute It states first base station and stops the upper line number for sending the downlink data of the UE to the UE and/or stopping sending the UE to core net According to；The upstream data of the UE and/or downlink data are forwarded to the second base station by the first base station, wherein second base It stands belonging to the Target cell that the candidate base station belonging to the candidate cell automatically switched including the UE or the UE automatically switch Target BS.In this way, the forward shifting method in handoff procedure provided by the invention can effectively reduce the expense of X2 interface, number is saved According to the expense of forward resource.

Second embodiment

Referring to Fig. 5, Fig. 5 is a kind of structural schematic diagram of base station provided in an embodiment of the present invention, which is UE access First base station, the first base station include：Processor 500, transceiver 510, memory 520, user interface 530 and bus interface, Wherein：

Processor 500 executes following process for reading the program in memory 520：

It is sent to the UE and judges whether the switching state of the UE meets the first trigger condition after automatically switching information；

If the switching state of the UE meets first trigger condition, stop the lower line number that the UE is sent to the UE According to and/or stop sending the upstream data of the UE to core net；

The upstream data of the UE and/or downlink data are forwarded to the second base station, wherein second base station includes institute State the target BS belonging to the Target cell that candidate base station or the UE belonging to the candidate cell of UE automatic switchovers automatically switch.

Wherein, in Figure 5, bus architecture may include the bus and bridge of any number of interconnection, specifically by processor 500 The various circuits for the memory that the one or more processors and memory 520 of representative represent link together.Bus architecture is also Various other circuits of such as peripheral equipment, voltage-stablizer and management circuit or the like can be linked together, these are all It is it is known in the art, therefore, it will not be further described herein.Bus interface provides interface.Transceiver 510 can To be multiple element, that is, includes transmitter and transceiver, the list for being communicated over a transmission medium with various other devices is provided Member.Processor 500 is responsible for bus architecture and common processing, and memory 520 can store processor 500 and execute operation When used data.

Processor 500 is responsible for bus architecture and common processing, and memory 520 can store processor 500 and hold Used data when row operation.

Optionally, the processor 500 judge the UE automatic switchover timer whether time-out mode include：

Judge whether to receive the automatic switchover timer expiry information that the UE is sent；Or

Opening for the automatic switchover timer of the UE is determined according to the measurement report for automatic switchover that the UE is sent Dynamic time and timing length, and judge that the automatic switchover timer of the UE is according to the startup time and timing length No time-out.

Optionally, first trigger condition includes：

Optionally, the processor 500 is additionally operable to：

Receive the forward link configuration information that second base station is sent；

The upstream data of the UE and/or downlink data are forwarded to the second base station by the processor 500, including：

The upstream data of the UE and/or downlink data are forwarded to described second according to the forward link configuration information Base station.

Optionally, the processor 500 stops sending the downlink data of the UE to the UE and/or stop to core net The upstream data of the UE is sent, including：

Stop the upstream data for sending the downlink data of the UE to the UE and/or stopping sending the UE to core net And cache the upstream data and/or downlink data of the UE；

The upstream data of the UE of the caching and/or downlink data are transmitted to second base station.

Optionally, the processor 500 stops sending the downlink data of the UE to the UE and/or stop to core net Before the upstream data for sending the UE, the processor 500 is additionally operable to：

Judge whether the switching state of the UE meets the second trigger condition；

If the switching state of the UE meets second trigger condition, the downlink data and/or uplink of the UE are cached Data；

Optionally, second trigger condition includes：

Stop sending non-acknowledgement UM patterns to the UE or confirm the downlink data of AM patterns, and/or is sent to core net Stop sending in the AM patterns from the UE to core net after the upstream data from the UE being properly received in order Row data；

Delete the uplink and/or down wireless link control rlc layer data of remaining AM patterns.

Optionally, the processor 500 caches the upstream data and/or downlink data of the UE, including：

UE described in warp-wise is cached to send but not by the downlink data of the UE AM patterns being properly received；And/or

Cache the downlink of AM patterns or UM patterns that the first base station that core net is sent and described is not sent to the UE also Data；And/or

Cache the upstream data for the out of order AM patterns that the UE is sent.

It should be noted that above-mentioned first base station can be schemed with the first base station in embodiment shown in Fig. 2 in the present embodiment The arbitrary embodiment of first base station can be realized by the above-mentioned first base station in the present embodiment in 2 illustrated embodiments, with And reach identical advantageous effect, details are not described herein again.

In several embodiments provided herein, it should be understood that disclosed method and apparatus, it can be by other Mode realize.For example, the apparatus embodiments described above are merely exemplary, for example, the division of the unit, only For a kind of division of logic function, formula that in actual implementation, there may be another division manner, such as multiple units or component can combine Or it is desirably integrated into another system, or some features can be ignored or not executed.Another point, shown or discussed phase Coupling, direct-coupling or communication connection between mutually can be by some interfaces, the INDIRECT COUPLING or communication of device or unit Connection can be electrical, machinery or other forms.

In addition, each functional unit in each embodiment of the present invention can be integrated in a processing unit, it can also It is that the independent physics of each unit includes, it can also be during two or more units be integrated in one unit.Above-mentioned integrated list The form that hardware had both may be used in member is realized, can also be realized in the form of hardware adds SFU software functional unit.

It should be understood that " one embodiment " or " embodiment " that specification is mentioned in the whole text mean it is related with embodiment A particular feature, structure, or characteristic includes at least one embodiment of the present invention.Therefore, occur everywhere in the whole instruction " in one embodiment " or " in one embodiment " not necessarily refer to identical embodiment.In addition, these specific feature, knots Structure or characteristic can in any suitable manner combine in one or more embodiments.

In various embodiments of the present invention, it should be appreciated that size of the sequence numbers of the above procedures is not meant to execute suitable The execution sequence of the priority of sequence, each process should be determined by its function and internal logic, the implementation without coping with the embodiment of the present invention Process constitutes any restriction.

In addition, the terms " system " and " network " are often used interchangeably herein.

It should be understood that the terms "and/or", only a kind of incidence relation of description affiliated partner, expression can deposit In three kinds of relationships, for example, A and/or B, can indicate：Individualism A exists simultaneously A and B, these three situations of individualism B. In addition, character "/" herein, it is a kind of relationship of "or" to typically represent forward-backward correlation object.

In embodiment provided herein, it should be appreciated that " B corresponding with A " indicates that B is associated with A, can be with according to A Determine B.It is also to be understood that determining that B is not meant to determine B only according to A according to A, acceptable basis and/or other information are true Determine B.

Those of ordinary skill in the art may realize that lists described in conjunction with the examples disclosed in the embodiments of the present disclosure Member and algorithm steps can be realized with the combination of electronic hardware or computer software and electronic hardware.These functions are actually It is implemented in hardware or software, depends on the specific application and design constraint of technical solution.Professional technician Each specific application can be used different methods to achieve the described function, but this realization is it is not considered that exceed The scope of the present invention.

It is apparent to those skilled in the art that for convenience and simplicity of description, the system of foregoing description, The specific work process of device and unit, can refer to corresponding processes in the foregoing method embodiment, and details are not described herein.

In embodiment provided herein, it should be understood that disclosed device and method can pass through others Mode is realized.For example, the apparatus embodiments described above are merely exemplary, for example, the division of the unit, only A kind of division of logic function, formula that in actual implementation, there may be another division manner, such as multiple units or component can combine or Person is desirably integrated into another system, or some features can be ignored or not executed.Another point, shown or discussed is mutual Between coupling, direct-coupling or communication connection can be INDIRECT COUPLING or communication link by some interfaces, device or unit It connects, can be electrical, machinery or other forms.

The unit illustrated as separating component may or may not be physically separated, aobvious as unit The component shown may or may not be physical unit, you can be located at a place, or may be distributed over multiple In network element.Some or all of unit therein can be selected according to the actual needs to realize the embodiment of the present invention Purpose.

In addition, each functional unit in each embodiment of the present invention can be integrated in a processing unit, it can also It is that each unit physically exists alone, it can also be during two or more units be integrated in one unit.

It, can be with if the function is realized in the form of SFU software functional unit and when sold or used as an independent product It is stored in a computer read/write memory medium.Based on this understanding, technical scheme of the present invention is substantially in other words The part of the part that contributes to existing technology or the technical solution can be expressed in the form of software products, the meter Calculation machine software product is stored in a storage medium, including some instructions are used so that a computer equipment (can be People's computer, server or network equipment etc.) it performs all or part of the steps of the method described in the various embodiments of the present invention. And storage medium above-mentioned includes：USB flash disk, mobile hard disk, ROM, RAM, magnetic disc or CD etc. are various can to store program code Medium.

The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any Those familiar with the art in the technical scope disclosed by the present invention, can easily think of the change or the replacement, and should all contain Lid is within protection scope of the present invention.Therefore, protection scope of the present invention should be subject to the protection scope in claims.

The embodiment provides a kind of methods of data forwarding in A1, handoff procedure, which is characterized in that the side Method includes：The first base station of user terminal UE access judges the switching state of the UE after sending automatic switchover information to the UE Whether first trigger condition is met；If the switching state of the UE meets first trigger condition, the first base station stops The downlink data of the UE is sent to the UE and/or stops sending the upstream data of the UE to core net；First base Stand and the upstream data of the UE and/or downlink data be forwarded to the second base station, wherein second base station include the UE from The target BS belonging to Target cell that candidate base station or the UE belonging to the candidate cell of dynamic switching automatically switch.

A2, the method as described in claim A1, which is characterized in that first trigger condition includes the automatic of the UE Switch overtime and the first base station send switching command to the UE not successfully.

A3, the method as described in claim A2, which is characterized in that the first base station judges the automatic switchover of the UE Whether the mode of time-out includes timer：The first base station judges whether to receive the automatic switchover timer that the UE is sent Time-out information；Or the first base station determines oneself of the UE according to the measurement report for automatic switchover that the UE is sent The startup time of dynamic switching timer and timing length, and judge the UE's according to the startup time and timing length Whether overtime automatically switch timer.

A4, the method as described in claim A1, which is characterized in that first trigger condition includes：First base Station receives the data forwarding request that second base station is sent；Or the first base station is sending downlink data to the UE It is not received by confirmation message in the first preset time afterwards or the first base station does not receive in the second preset time To the upstream data of the UE；Or the first base station receives the measurement report for automatic switchover that the UE is sent.

A5, the method as described in claim A1, which is characterized in that the method further includes：The first base station receives The forward link configuration information that second base station is sent；The first base station is by the upstream data of the UE and/or lower line number According to being forwarded to the second base station, including：The first base station is according to the forward link configuration information by the upstream data of the UE And/or downlink data is forwarded to second base station.

A6, the method as described in claim A1, which is characterized in that the first base station stops to described in UE transmissions The downlink data of UE and/or the upstream data for stopping sending the UE to core net, including：The first base station stops to described UE sends the downlink data of the UE and/or stops sending the upstream data of the UE to core net and cache the upper of the UE Row data and/or downlink data；The upstream data of the UE and/or downlink data are forwarded to the second base by the first base station It stands, including：The upstream data of the UE of the caching and/or downlink data are transmitted to second base by the first base station It stands.

A7, the method as described in claim A1, which is characterized in that the first base station stops to described in UE transmissions The downlink data of UE and/or stop before the upstream data that core net sends the UE, the method further includes：First base station Judge whether the switching state of the UE meets the second trigger condition；If the switching state of the UE meets the second triggering item Part, the first base station cache the downlink data and/or upstream data of the UE；The first base station is by the upper line number of the UE According to and/or downlink data be forwarded to the second base station, including：The first base station is by the upstream data of the UE of the caching And/or downlink data is transmitted to second base station.

A8, the method as described in claim A7, which is characterized in that second trigger condition includes：First base It stands and completes the automatic switchover preparation of the UE；Or the first base station is default to first after UE transmission downlink datas It is not received by confirmation message in time or the first base station is not received by the upper of the UE in the second preset time Row data；Or the first base station receives the measurement report for automatic switchover that the UE is sent.

A9, such as claim A1~A8 any one of them method, which is characterized in that the first base station stops to described UE sends the downlink data of the UE and/or stops sending the upstream data of the UE to core net, including：The first base station Stop to the UE send non-acknowledgement UM patterns or confirm AM patterns downlink data, and/or to core net send in order at Stop sending the AM pattern upstream datas from the UE to core net after the upstream data from the UE that work(receives；Institute State uplink and/or down wireless link control rlc layer data that first base station deletes remaining AM patterns.

A10, the method as described in claim A9, which is characterized in that the first base station caches the upper line number of the UE According to and/or downlink data, including：The first base station caches the AM that UE sends but is not properly received by the UE described in warp-wise The downlink data of pattern；And/or the first base station caches the first base station that core net is sent and described and is not sent out to the UE also The downlink data of the AM patterns or UM patterns sent；And/or the first base station caches the out of order AM patterns that the UE is sent Upstream data.

B11, a kind of base station, the base station be user terminal access first base station, the first base station include processor, Transceiver, memory, user interface and network interface, which is characterized in that the processor is used for：It is sent to the UE automatic Judge whether the switching state of the UE meets the first trigger condition after handover information；If described in the switching state of the UE meets First trigger condition stops sending the downlink data of the UE to the UE and/or stops sending the upper of the UE to core net Row data；The upstream data of the UE and/or downlink data are forwarded to the second base station, wherein second base station includes institute State the target BS belonging to the Target cell that candidate base station or the UE belonging to the candidate cell of UE automatic switchovers automatically switch.

B12, the base station as described in claim B11, which is characterized in that first trigger condition includes oneself of the UE It moves switch overtime and the first base station sends switching command to the UE not successfully.

B13, the base station as described in claim B12, which is characterized in that the processor judges the automatic switchover of the UE Whether the mode of time-out includes timer：Judge whether to receive the automatic switchover timer expiry information that the UE is sent；Or The startup time for automatically switching timer that the UE is determined for the measurement report automatically switched that person sends according to the UE And timing length, and judge whether the automatic switchover timer of the UE surpasses according to the startup time and timing length When.

B14, the base station as described in claim B11, which is characterized in that first trigger condition includes：Described first Base station receives the data forwarding request that second base station is sent；Or first base station line number in the case where being sent to the UE It is not received by confirmation message in the first preset time after or the first base station does not connect in the second preset time Receive the upstream data of the UE；Or the first base station receives the measurement report for automatic switchover that the UE is sent It accuses.

B15, the base station as described in claim B11, which is characterized in that the processor is additionally operable to：Receive described second The forward link configuration information that base station is sent；The upstream data of the UE and/or downlink data are forwarded to by the processor Two base stations, including：The upstream data of the UE and/or downlink data be forwarded to according to the forward link configuration information described Second base station.

B16, the base station as described in claim B11, which is characterized in that the processor stops to described in UE transmissions The downlink data of UE and/or the upstream data for stopping sending the UE to core net, including：Stop sending the UE to the UE Downlink data and/or stop to core net send the upstream data of the UE and cache the UE upstream data and/or Downlink data；The upstream data of the UE and/or downlink data are forwarded to the second base station by the processor, including：It will be described The upstream data and/or downlink data of the UE of caching is transmitted to second base station.

B17, the base station as described in claim B11, which is characterized in that the processor stops to described in UE transmissions The downlink data of UE and/or stop before the upstream data that core net sends the UE, the processor is additionally operable to：Judge institute Whether the switching state for stating UE meets the second trigger condition；If the switching state of the UE meets second trigger condition, delay Deposit the downlink data and/or upstream data of the UE；The processor forwards the upstream data of the UE and/or downlink data To the second base station, including：The upstream data of the UE of the caching and/or downlink data are transmitted to second base station.

B18, the base station as described in claim B17, which is characterized in that second trigger condition includes：Described first The automatic switchover that the UE is completed in base station prepares；Or the first base station is pre- to first after UE transmission downlink datas If being not received by confirmation message in the time or the first base station being not received by the UE's in the second preset time Upstream data；Or the first base station receives the measurement report for automatic switchover that the UE is sent.

B19, such as claim B11~B18 any one of them base station, which is characterized in that the processor stops to institute UE is stated to send the downlink data of the UE and/or stop sending the upstream data of the UE to core net, including：Stop to described UE sends non-acknowledgement UM patterns or confirms the downlink data of AM patterns, and/or comes to what core net transmission was properly received in order Stop sending the AM pattern upstream datas from the UE to core net from after the upstream data of the UE；Delete remaining AM The uplink and/or down wireless link of pattern control rlc layer data.

Base station the embodiments of the present invention also provide B20, as described in claim B19, which is characterized in that the processing Device caches the upstream data and/or downlink data of the UE, including：UE described in warp-wise is cached to send but not by UE successes The downlink data of the AM patterns of reception；And/or cache what the first base station that core net is sent and described was not sent to the UE also The downlink data of AM patterns or UM patterns；And/or the upstream data of the out of order AM patterns of the caching UE transmissions.

Claims

1. a kind of method of data forwarding in handoff procedure, which is characterized in that the method includes：

The first base station of user terminal UE access judges that the switching state of the UE is after sending automatic switchover information to the UE The first trigger condition of no satisfaction；

If the switching state of the UE meets first trigger condition, the first base station stops sending the UE to the UE Downlink data and/or stop sending the upstream data of the UE to core net；

The upstream data of the UE and/or downlink data are forwarded to the second base station by the first base station, wherein second base It stands belonging to the Target cell that the candidate base station belonging to the candidate cell automatically switched including the UE or the UE automatically switch Target BS.

2. the method as described in claim 1, which is characterized in that first trigger condition includes that the automatic switchover of the UE is fixed When device time-out and the first base station send switching command to the UE not successfully.

3. method as claimed in claim 2, which is characterized in that the first base station judges the automatic switchover timer of the UE Whether the mode of time-out includes：

The first base station determines that the automatic switchover of the UE is fixed according to what the UE was sent for the measurement report automatically switched When device the startup time and timing length, and the automatic switchover of the UE is judged according to the startup time and timing length Whether timer is overtime.

4. the method as described in claim 1, which is characterized in that first trigger condition includes：

The first base station to the UE send downlink data after the first preset time in be not received by confirmation message or First base station described in person is not received by the upstream data of the UE in the second preset time；Or

5. the method as described in claim 1, which is characterized in that the method further includes：

The upstream data of the UE and/or downlink data are forwarded to by the first base station according to the forward link configuration information Second base station.

6. the method as described in claim 1, which is characterized in that the first base station stops sending under the UE to the UE Row data and/or the upstream data for stopping sending the UE to core net, including：

The first base station stops sending the downlink data of the UE to the UE and/or stops sending the UE's to core net Upstream data and the upstream data and/or downlink data for caching the UE；

The upstream data of the UE of the caching and/or downlink data are transmitted to second base station by the first base station.

7. the method as described in claim 1, which is characterized in that the first base station stops sending under the UE to the UE Row data and/or stop before the upstream data that core net sends the UE, the method further includes：

If the switching state of the UE meets second trigger condition, the first base station caches the downlink data of the UE And/or upstream data；

8. the method for claim 7, which is characterized in that second trigger condition includes：

9. such as claim 1~8 any one of them method, which is characterized in that the first base station stops sending to the UE The downlink data of the UE and/or the upstream data for stopping sending the UE to core net, including：

The first base station stops sending non-acknowledgement UM patterns to the UE or confirms the downlink data of AM patterns, and/or to core Heart net stops sending from the UE's to core net after sending the upstream data from the UE being properly received in order AM pattern upstream datas；

10. a kind of base station, the base station is the first base station of user terminal access, and the first base station includes processor, transmitting-receiving Machine, memory, user interface and network interface, which is characterized in that the processor is used for：

If the switching state of the UE meets first trigger condition, stop the downlink data that the UE is sent to the UE And/or stop sending the upstream data of the UE to core net；

The upstream data of the UE and/or downlink data are forwarded to the second base station, wherein second base station includes the UE The target BS belonging to Target cell that candidate base station or the UE belonging to the candidate cell of automatic switchover automatically switch.