CN108307460A

CN108307460A - A kind of cell switching method, terminal and base station

Info

Publication number: CN108307460A
Application number: CN201710017876.0A
Authority: CN
Inventors: 孙立新; 丁颖哲; 周明宇; 路杨
Original assignee: Baicells Technologies Co Ltd
Current assignee: Baicells Technologies Co Ltd
Priority date: 2017-01-11
Filing date: 2017-01-11
Publication date: 2018-07-20
Also published as: WO2018130153A1

Abstract

A kind of cell switching method of present invention offer, terminal and base station.Cell switching method includes：The terminal of first community obtains the relevant information of at least one second community by the base station of first community, and each second community is the adjacent cell of first community, and belongs to different base stations from first community；Terminal determines the channel seizure ratio or channel seizure ratio comparing result of at least one second community according to relevant information；Terminal chooses a second community as Target cell according to the channel seizure ratio or channel seizure ratio comparing result of at least one second community；Terminal initiates the cell access request for Target cell.The solution of the present invention can make terminal preferentially choose the lower adjacent cell of channel seizure ratio to switch over, to improve the success rate of terminal switching cell, and avoid the delay generated by handover failure.For user experience, there is important improvement meaning.

Description

A kind of cell switching method, terminal and base station

Technical field

The present invention relates to field of communication technology, a kind of cell switching method, terminal and base station are particularly related to.

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 authorized spectrum band carrier wave.In order to other in unauthorized frequency range equipment (such as WiFi equipment) Justice occupies unauthorized band channels and avoids interfering with each other between unauthorized frequency range equipment, and MF physical layers introduce similar WiFi's Listem-before-talk (LBT, Listen Before Talk) mechanism of carrier sense technology.In base station or terminal monitoring to unauthorized frequency When Duan Xindao is occupied, is i.e. when LBT fails, stops sending signal, when listening to channel idle, i.e. just be sent when LBT is successful Signal.

In order to improve the downlink common control signal efficiency of transmission of base station under LBT mechanism, MulteFire introduces discovery ginseng Signal (DRS, Discovery Reference Signal) is examined, DRS contains main downlink common control signal, including is Unite broadcast, primary synchronization signal (PSS, Primary Sync Signal), secondary synchronization signal (SSS, Secondary Sync Signal), enhancing primary synchronization signal (ePSS, enhanced Primary Sync Signal), enhancing secondary synchronization signal (eSSS, enhanced Secondary Sync Signal), cell reference signals (CRS, Cell Reference Signal), host system message block (MIB, Master Information Block) and enhancing system information block (SIB-MF, System Information Block Multefire), DRS occupies 12 or 14 symbols in a downlink subframe (Symbol).UE can configure (DMTC, Discovery Signals Measurement finding the signal measurement time Timing Configuration) DRS is received in window to carry out down-going synchronous, receive MIB and SIB-MF.MF cells only exist DRS subframes or other have Physical Downlink Shared Channel (PDSCH, Physical Downlink Shared Channel) transmission Subframe send CRS, therefore UE can carry out channel measurement only in DMTC windows to MF serving cells or MF adjacent cells, be used for Cell selection, cell reselection or switching.Base station can send serving cell, co-frequency neighbor cell and iso-frequency adjacent community respectively to UE DMTC information.

Due to the LBT mechanism of Multefire systems, when UE initiates random access Target cell to Target cell, if mesh The channel seizure ratio for marking cell side is higher, and Target cell is needed to continue monitor channel and could be sent to UE after LBT successes Random access response will increase handover delay, to increase the handover failure rate of terminal.Industry can only be interrupted after terminal handover failure Until rebuilding connection behind re-selecting cell, the prior art can not solve terminal caused by the channel seizure ratio height of Target cell and switch for business The higher problem of mortality.

Invention content

The object of the present invention is to provide a kind of schemes carrying out cell switching according to cell channel occupancy situation.

To achieve the above object, on the one hand, the embodiment of the present invention provides a kind of cell switching method, is applied to terminal, The terminal accesses first community, including：

Terminal obtains the relevant information of at least one second community by the base station of first community, and each second community is equal For the adjacent cell of the first community, and belong to different base stations from the first community；

Terminal determines that the channel seizure ratio of at least one second community or channel account for according to the relevant information With rate comparing result；

Terminal chooses one according to the channel seizure ratio or channel seizure ratio comparing result of at least one second community A second community is as Target cell；

Terminal initiates the cell access request for the Target cell.

Wherein, terminal obtains the relevant information of at least one second community to the base station of first community, including：

Terminal obtains the related letter from the dedicated radio resources control RRC information that the base station of the first community is sent Breath；Or

The relevant information is obtained in the public system broadcast message that terminal is sent by the base station of the first community.

Wherein, the relevant information is：The channel seizure ratio or channel seizure ratio pair of at least one second community Compare result；

Terminal is from the RRC reconfiguration messages that the base station of the first community is sent, or from the base station of the first community The channel occupancy of at least one second community is obtained in public system broadcast message SIB1, SIB2 or SIB-MF of transmission Rate or channel seizure ratio comparing result.

On the other hand, another embodiment of the present invention also provides a kind of cell switching method, is applied to the base of first community It stands, including：

The base station of first community sends the relevant information of at least one second community to the terminal of access first community, makes Obtain channel seizure ratio or channel seizure ratio that the terminal determines at least one second community according to the relevant information Comparing result, and according to the channel seizure ratio or channel seizure ratio comparing result of at least one second community, select one A second community is as Target cell to be accessed.

Wherein, the base station of first community sends the related letter of at least one second community to the terminal of access first community Breath, including：

The base station of first community controls RRC information by dedicated radio resources, or is broadcast the message institute by public system It states relevant information and is sent to the terminal.

In addition, another embodiment of the present invention also provides a kind of terminal, the terminal accesses first community, including：

Transceiver, memory, actuator and processor；

The memory stores software program；

The processor by run the software program for：

The relevant information that the transceiver obtains at least one second community by the base station of first community is controlled, each Second community is the adjacent cell of the first community, and belongs to different base stations from the first community；

According to the relevant information, the channel seizure ratio or channel seizure ratio of at least one second community are determined Comparing result；

According to the channel seizure ratio or channel seizure ratio comparing result of at least one second community, one the is chosen Two cells are as Target cell；

It controls the actuator and initiates the cell access request for being directed to the Target cell.

Wherein, the processor specifically controls base station of the transceiver to first community by running the software program The relevant information of at least one second community is obtained, including：

The relevant information is obtained from the dedicated radio resources control RRC information that the base station of the first community is sent； Or

The relevant information is obtained in the public system broadcast message sent by the base station of the first community.

The processor specifically controls the transceiver from the base station of the first community by running the software program It is obtained in the RRC reconfiguration messages of transmission or in public system broadcast message SIB1, SIB2 or SIB-MF described at least one The channel seizure ratio or channel seizure ratio comparing result of second community.

In addition, another embodiment of the present invention also provides a kind of base station, the base station has first community, including：

Transceiver, memory and processor；

The memory stores software program；

The processor by run the software program for：

Controlling the transceiver, it sends the relevant information of at least one second community to the terminal of access first community, So that the terminal determines the channel seizure ratio or channel occupancy of at least one second community according to the relevant information Rate comparing result, and according to the channel seizure ratio of at least one second community or channel seizure ratio comparing result, select one A second community is as Target cell to be accessed.

Wherein, the processor by run the software program control the transceiver its to access first community end End sends the relevant information of at least one second community, including：

RRC information is controlled by dedicated radio resources, or is broadcast the message by public system and sends the relevant information To the terminal.

The said program of the present invention has the advantages that：

The solution of the present invention can make terminal preferentially choose the lower adjacent cell of channel seizure ratio to switch over, to improve The success rate of terminal switching cell, and avoid the delay generated by handover failure.For user experience, have important Improve meaning.

Description of the drawings

Fig. 1 is the cell switching method of the present invention in end side flow diagram；

Fig. 2 is the cell switching method of the present invention in base station side flow diagram；

Fig. 3-5 is the flow diagram of the cell switching method of the present invention in practical applications；

Fig. 6 is the structural schematic diagram of the terminal of the present invention；

Fig. 7 is the structural schematic diagram of the base station of the present invention.

Specific implementation mode

To keep the technical problem to be solved in the present invention, technical solution and advantage clearer, below in conjunction with attached drawing and tool Body embodiment is described in detail.

For problem of the prior art, the present invention proposes a kind of side carrying out cell switching according to cell channel occupancy situation Case.

On the one hand, the embodiment of the present invention provides a kind of cell switching method applied to terminal, terminal access first Cell, as shown in Figure 1, cell switching method includes：

Step 11, terminal obtains the relevant information of at least one second community, Mei Ge by the base station of first community Two cells are the adjacent cell of first community, and belong to different base stations from first community；

Step 12, terminal determines that the channel seizure ratio of at least one second community or channel account for according to relevant information With rate comparing result；

Wherein, LBT successful probability when channel seizure ratio is for reflecting that cell sends downlink data, can be specifically defined For：Channel occupancy is carried out for transmission data in preset time detects successful number and channel occupancy detection total degree Than, or the channel occupancy of period progress detects number of success in preset time during idle time and channel occupancy detects always Than.In addition, the channel occupancy detection of second community is executed by the base station of second community, can be CCA (Clear Channel Assessment), it can also be other Channel Detections (such as initial CCA or extended CCA).Channel occupancy is examined It surveys successfully, a CCA success can be referred to, multiple CCA can also be referred to and continuously detect success.In addition, as exemplary introduction, channel Occupancy can be defined as the average received signal strength RSS that cell base station detects in idle state preset time (Received Signal Strength), alternatively, the RSS detected in preset time is more than the ratio of specified threshold, example Such as, detect that the RSS of N number of subframe is more than specified threshold in T subframe, then channel seizure ratio is N/T.

Step 13, terminal is according to the channel seizure ratio or channel seizure ratio comparing result of at least one second community, choosing Take a second community as Target cell；

Step 14, terminal initiates the cell access request for Target cell.

Obviously, the switching method of the present embodiment can make terminal preferentially choose the lower adjacent cell of channel seizure ratio to be cut It changes, to improve the success rate of terminal switching cell, and avoids the delay generated by handover failure.User experience is come Say that there is important improvement meaning.

Specifically, in above-mentioned steps 11, terminal obtains there are two types of the modes of the relevant information of second community.

One is terminals to obtain related letter from the dedicated radio resources control RRC information that the base station of first community is sent Breath；

Public system broadcast message that be terminal in another sent by the base station of first community (such as：SIB3 and/or SIB5 relevant information is obtained in).

In practical applications, terminal can be initiated to survey just for part second community (second community for meeting certain condition) Amount report, measurement report carry the mark of part second community, and the base station of first community can have selection according to measurement report Property only feed back it is above-mentioned have mark second community relevant information.

Furthermore, it is necessary to be described, the relevant information of the present embodiment is used to determine the channel occupancy of each second community Rate or channel seizure ratio comparing result, can directly be the channel seizure ratio or channel seizure ratio comparing result of second community, Can be the information of the indirect channel seizure ratio or channel seizure ratio comparing result for determining second community.

As exemplary introduction, it is assumed that the relevant information of the present embodiment is the channel occupancy of at least one second community The channel seizure ratio can be then encapsulated in RRC reconfiguration messages by rate, i.e., terminal is sent from the base station of the first community The channel seizure ratio of at least one second community is obtained in RRC reconfiguration messages；

Alternatively, using the information of the channel seizure ratio or channel seizure ratio comparing result of determining second community indirectly as example Property introduction, the relevant information of the present embodiment can include：The measurement configuration information of each second community, in measurement configuration information Including measurement object configuration and measurement report configuration, terminal can get small for second by the measurement configuration information of second community The measurement report configuration in area, measurement report configuration include the discovery signal measurement time configuration DMTC information of second community.

In the prior art, when the base station of second community detects that channel seizure ratio is relatively low, in DMTC time windows More idle subframe is will produce, and reference signal DRS is found using being sent in idle subframe master.And channel seizure ratio it is higher when, It is then more difficult to send DRS using idle subframe.

Terminal is matched from the measurement in the public system broadcast message SIB3 or RRC reconfiguration messages that first community base station is sent Set the DMTC information of acquisition of information and first community with the second community of frequency, and/or, from public system broadcast the message SIB5 or RRC reconfiguration messages obtain at least one DMTC information with the second community of first community alien frequencies.Wherein, second community The instruction information with the presence or absence of the second community asynchronous with first community is included at least in DMTC information, it is also possible to include and first The DMTC parameters of the second community of cell synchronous and/or the DMTC parameters of the second community asynchronous with first community.The DMTC Parameter includes DMTC window durations (dmtc-duration), the period (dmtc-Periodicity) of DMTC windows and son At least one of in vertical shift (dmtc-Offset).DMTC information may be used to determine the position of DMTC windows.

If not including DMTC information in the measurement configuration information for the second community that first community base station is sent, terminal may be used also To obtain the DMTC information of second community by reading the public system broadcast message (such as SIB-MF) of second community.

Preferably, the DMTC Information encapsulations of the present embodiment second community are in the measurement configuration information of RRC reconfiguration messages, I.e. terminal is obtained with first community from the measurement configuration information for the RRC reconfiguration messages that the base station of first community is sent with frequency The DMTC information of second community and/or at least one DMTC information with the second community of first community alien frequencies.

In terminal after determining the time window positions DMTC of second community according to the DMTC information of second community, Ke Yi The DRS transmitted by second community is received in the DMTC time windows of second community, and calculates second according to the reception condition of DRS The channel seizure ratio of cell.

Below to how reception condition based on DRS calculates the channel seizure ratio of second community in the step 13 of the present embodiment It describes in detail.

Illustratively, the step 13 of the present embodiment includes：

Step 131, terminal is according to DMTC information, in the time window of the DMTC of each second community, receives each the The discovery reference signal DRS that two cells are initiated；

Step 132, terminal determines it in preset time for the successful receiving rate of the DRS of each second community；

Wherein, the successful receiving rate of the DRS of each second community is directed to the second community in preset time equal to terminal The ratio of the number of the DMTC with DRS detected and the sum of the time window of DMTC in the preset time；

Step 133, terminal quantifies each second community according to the success rate of the discovery reference signal of each second community Channel seizure ratio.Specifically, success rate is higher, then the channel seizure ratio for quantifying is lower；Otherwise success rate is higher, then quantify The channel seizure ratio gone out is higher.

After the channel seizure ratio or channel seizure ratio comparing result for determining each second community, terminal can preferentially choose it In one be used as Target cell.

It describes in detail below to the scheme for choosing Target cell.

Illustratively, such as the channel seizure ratio that the relevant information of the present embodiment is each second community, then above-mentioned steps are executed When 13, terminal chooses a signal strength highest second in the second community that channel seizure ratio meets the first preset requirement Cell is as Target cell；Or terminal is chosen a channel and is accounted in the second community that signal strength meets the second preset requirement The second community for using rate minimum is as Target cell.

If as the present embodiment relevant information be all second communities channel seizure ratio comparing result when, execute When above-mentioned steps 13, terminal is compared according to channel seizure ratio and is tied in the second community that signal strength meets the second preset requirement Fruit chooses the minimum second community of a channel seizure ratio as Target cell.

It should be noted that in practical applications, the terminal of the present embodiment is not necessarily required to choose a second community It switches over, such as when the channel seizure ratios of all second communities is not up to benchmark and requires, then terminal can not choose mesh Cell is marked, can still maintain access first community in this case.Alternatively, the second community that the present invention will can also preferentially select It is compared with first community, and when the channel seizure ratio of the second community preferentially selected is better than first community, can just be incited somebody to action It is as Target cell and switches over.

In addition, the terminal of the present embodiment can also directly receive Target cell determined by the base station from first community, And it preferably selects Target cell determined by the base station of first community and initiates cell switching request.For example, first base station is according to obtaining The channel seizure ratio of the second community taken later passes through Target Cell Identifier for the Target cell that terminal selects to switch Special RRC message is sent to terminal；It is determined if the special RRC message that terminal receives includes the base station of the first community The Target cell arrived then can directly initiate the cell access request for the Target cell in the special RRC message.

The terminal of the present embodiment can also receive the second community list of first base station transmission, second community list instruction The second community that terminal allows hand over；Terminal is compared according to the channel seizure ratio or channel seizure ratio of at least one second community As a result, selecting a second community belonged in the second community list as Target cell.

Accordingly, another embodiment of the present invention also provides a kind of cell switching method applied to base station, such as Fig. 2 institutes Show, including：

Step 21, the base station of first community sends the correlation of at least one second community to the terminal of access first community Information so that terminal determines the channel seizure ratio or channel seizure ratio pair of at least one second community according to institute's relevant information Than as a result, and according to the channel seizure ratio of at least one second community or channel seizure ratio comparing result, selecting one the Two cells are as Target cell to be accessed.

Obviously, the base station of the cell switching method based on the present embodiment, terminal current area can provide other to terminal The relevant information of the adjacent cell of base station so that terminal can according to the relevant information come determine adjacent cell channel seizure ratio or Channel seizure ratio comparing result between adjacent cell is preferentially chosen an adjacent cell so as to being based on channel seizure ratio and is cut It changes.

Specifically, in the present embodiment above-mentioned steps 21, the base station of first community controls RRC by dedicated radio resources and disappears Breath, or broadcast the message by public system and relevant information is sent to the terminal.

In addition, according to above description it is recognised that the base station that the channel seizure ratio of second community is second community passes through letter Road detection determined, therefore also needs to the base station of first community at least one in the present embodiment cell switching method The base station of second community obtains the channel seizure ratio of at least one second community；The base station of first community is according to acquisition later The channel seizure ratio of at least one second community arrived generates relevant information.

In the method for specifically obtaining channel seizure ratio, the base station of first community can by S1 interfaces or X2 interface to The base station of each second community sends a channel seizure ratio request message, and the base station of reception second community is accounted for according to the channel The channel seizure ratio response message fed back to rate request message.Wherein, which includes then The channel seizure ratio of two cells.

Or the base station of first community is received and is sent out by the base station of at least one second community by S1 interfaces or X2 interface The channel seizure ratio instruction message sent, wherein include the channel seizure ratio of the second community in channel seizure ratio instruction message.

Similarly, the base station of the first community of the present embodiment can also use aforesaid way to send the to the base station of second community The channel seizure ratio of one cell so that the other-end that the base station of second community can be accessed to it sends the channel of first community The terminal under the base station of the second community also can be chosen whether to switch to first community based on channel seizure ratio for occupancy.

In addition, channel seizure ratio or letter of the base station of the first community of the present embodiment also according at least one second community Road occupancy comparing result chooses a second community as Target cell；And the Target cell of selection is disappeared by above-mentioned RRC Breath is sent to the terminal so that the terminal is directly initiated to ask for the cell access of the Target cell in the RRC information It asks.

With reference to practical application, describe in detail to the end side and base station side cell switching method of the present invention.

Practical application one

Illustratively, this practical application one discloses a kind of scheme that the autonomous selection target cell of terminal is accessed, In automatic switchover, it is not required to when terminal needs to switch over by measuring the channel quality determination of present access subzone and adjacent cell Cell access request can be initiated to the Target cell independently selected by receiving the switching command of base station, or even when terminal measurement is worked as Determine that the when of needing to switch over does not have to send measurement report to base station where it after the channel quality of preceding access cell and adjacent cell.

In this practical application one, it is assumed that terminal current area is the first community of first base station, is intended to the second base station Second community initiates cell access request.Wherein second community is the adjacent cell of first community, and second community and its affiliated Second base station does not refer to one, and corresponding specific switching flow may include：

Terminal receives the relevant information of the channel seizure ratio for the second community that first base station is sent or terminal passes through detection the The discovery reference signal DRS of two cells determines the relevant information of the channel seizure ratio of second community.

Wherein, there are two types of methods for the relevant information of terminal acquisition second community channel seizure ratio：

Method one：Terminal receives the relevant information for the second community channel seizure ratio that first base station is sent.

The relevant information of second community channel seizure ratio can be included in RRC information and be sent to terminal by first base station, So that Target cell of the terminal according to the selection switching of the relevant information of the channel seizure ratio in RRC information.First base station can be from Second base station receives the relevant information of the channel seizure ratio of second community, and second community is the serving cell or second of the second base station The adjacent cell of base station serving cell.

Wherein, first base station can receive the related letter of the channel seizure ratio of the second community of the second base station periodicity sending Breath, alternatively, the second base station receives after the request of channel seizure ratio that first base station is sent, the second base station feeds back the to first base station The relevant information of the channel seizure ratio of two cells.

Further, terminal can initiate the measurement report for second community to first base station.If first base station receives To the measurement report of terminal, can only include by the relevant information of the channel seizure ratio of the second community indicated in measurement report then Terminal is sent in RRC information.

Method two：The channel seizure ratio of first community is determined by detecting the DRS of second community.Wherein, second community Periodically in DMTC time windows, a DRS is sent using idle subframe, therefore terminal can be in DMTC time windows DRS is received, and the channel seizure ratio of second community is measured by DRS.

In the concrete realization, terminal obtains the by the first base station cell broadcast service information SIB3 or SIB5 accessed Two cells send the DMTC information of DRS, or receive the RRC reconfiguration messages acquisition the comprising measuring configuration that first base station is sent Two cells send the DMTC information of DRS, if it is small not include second in the measurement configuration information for the second community that first base station is sent The DMTC information in area, then terminal, which also passes through, reads the public system broadcast message of second community and obtains second community and send DRS DMTC information.Wherein, DMTC information includes DMTC parameters described above, and DMTC parameters can be DMTC window weeks Phase, the offset of DMTC window subframes or DMTC window durations, terminal are small by the DMTC information available second of second community The position of the DMTC time windows in area.

Under existing LBT mechanism, second community can only send DRS in idle subframe, therefore not be each DMTC windows The DRS of second community can be sent, terminal is not detected DRS and then illustrates that the channel of second community is just busy, and terminal can will detect The channel seizure ratio of second community is dissolved to the ratio corresponding amount of second community DRS, the detection ratio of wherein second community DRS can To be calculated as detecting the ratio of the number and the DMTC window numbers in the preset time of second community DRS in preset time Value.

In addition, terminal can also receive the second community list of first base station transmission, second community list instruction terminal energy The second community enough switched, terminal can only choose second community that one belongs to second community list as Target cell.Therefore, In this realization method one, terminal can only detect the DRS for the second community for meeting list, and the channel for calculating the second community accounts for With rate.

During determining Target cell, the phase of the channel seizure ratio for the second community that terminal is sent according to first base station Close the Target cell that the second community that information selects channel seizure ratio minimum switches as terminal；Or terminal is small according to detection second The second community channel seizure ratio that the DRS in area is obtained, what the second community to select channel seizure ratio minimum switched as terminal Target cell.

Based on foregoing description, flow such as Fig. 3 institutes that terminal is switched over by the DRS of second community come selection target cell Show.

Further, preferably, terminal can be believed according to second community channel seizure ratio and second community simultaneously Number quality carrys out selection target cell.For example, terminal meets switching condition (for example, meeting A3 trigger conditions) in signal quality Second community in, the Target cell of the second community that selects channel seizure ratio minimum as generation switching；For another example terminal is being believed Road occupancy meets in the second community of specified threshold, and the highest second community of selection signal quality is small as to be switched target Area.

Practical application two

This practical application two discloses a kind of method that terminal carries out cell switching according to cell channel occupancy situation, can be with Terminal is can also be used for for terminal tradition switching (switching controlled by base station) in the prior art to automatically switch.It is cut in tradition In changing, terminal-pair adjacent cell carries out pilot signal measurement, is sent to current base station when measurement result meets handover event condition Measurement report；Current base station will switch over preparation according to measurement report, be sent to other base stations of one or more adjacent cells Switching request message selects one of Target cell and to terminal after receiving the handover request ack message of other base stations Send the switching command based on the Target cell.In terminal independently switches, when terminal is by measuring present access subzone and neighbour The channel quality of cell determines when needing to switch over without can independently be selected until receiving the switching command of current base station Target cell initiates cell access request, or even is determined after terminal measures the channel seizure ratio of present access subzone and adjacent cell Do not have to send measurement report to current base station when needing to switch over.

In this practical application two, it is assumed that terminal current area is the first community of first base station, is intended to the second base station Second community initiates cell access request.Wherein second community is the adjacent cell of first community, and second community and its affiliated Second base station does not refer to one, and corresponding specific switching flow may include：

First base station receives the relevant information of the channel seizure ratio for the second community that the second base station is sent.Specifically, first Base station receives the relevant information of the channel seizure ratio of the second community of the second base station transmission in the following manner：

Mode one：Receive the relevant information of the channel seizure ratio of the second community of the second base station periodicity sending.

Which once, no matter whether terminal needs to switch, and first base station can receive the of the second base station transmission The relevant information of the channel seizure ratio of two cells.First base station can receive the phase of the channel seizure ratio of one or more second communities Information is closed, the relevant information of the channel seizure ratio of multiple second community can be that one or more second base stations are sent.It should The relevant information for the second community channel seizure ratio that first base station receives can be that the second base station is actively sent, and can also be the It is fed back later based on the channel seizure ratio request that the first base station period sends two base stations.

Mode two：First base station is after the measurement report for receiving terminal transmission, to the second community of the second base station transmission Channel seizure ratio relevant information

In the specific implementation, first base station can determine that terminal needs to carry out according to the measurement report to adjacent cell that terminal is sent Switching (tradition or automatically switch), it is small that the cell indicated in measurement report that terminal reports can be determined as second by first base station Area, and channel seizure ratio request message is sent to the second base station, the second base station is received later is based on channel seizure ratio request institute The channel seizure ratio response message of feedback, the channel seizure ratio response message carry the related letter of second community channel seizure ratio Breath.

Specifically, it is small can to receive the second base station is sent second by X2 interface message or S1 interface messages for first base station The relevant information of the channel seizure ratio in area, wherein it is new that X2 interface message or S1 interface messages can be that existing message can also be The specific messages of increasing.

For example, in mode one, first base station passes through X2 message eNB configuration update/eNB The channel seizure ratio for the second community that the second base station of configuration update acknowledge periodic receipts is sent Relevant information；Further, first base station can be by the channel seizure ratio request message of S1 or X2 interface to ask second Base station sends the relevant information of the channel seizure ratio of second community, wherein channel seizure ratio request message.

In the concrete realization, it can also be the second base station serving cell that second community, which can be the serving cell of the second base station, Adjacent cell.When second community is the second base station serving cell, first base station receives the second base station and is believed by its serving cell Cease the relevant information of the second community channel seizure ratio sent；When second community is the adjacent cell of the second base station serving cell, First base station receives the relevant information for the second community channel seizure ratio that the second base station is sent by its information of adjacent cells.If passing through The service cell information of second base station sends the relevant information of second community channel seizure ratio, then eNB configuration Serving cell Information packets in update/eNB configuration update acknowledge message The Info fields of Occupy containing Channel, there is following coded format：

If the information of adjacent cells by the second base station serving cell sends the relevant information of second community channel seizure ratio, With reference to upper table, in eNB configuration update/eNB configuration update acknowledge message Serving cell Information in the Neigbour Information Channel Occupy Info that are included Field has following coded format：

In another example in mode two,

When first base station determines that terminal carries out tradition switching, pass through the first switching request message of X2 interface (Handover Request) sends the request of second community channel seizure ratio to the second base station, is accounted for wherein carrying second community channel It asks to identify with rate, the is received by the first switching response message (Handover Request Acknowledge) of X2 interface The relevant information of fed back second community channel seizure ratio is asked based on the second community channel seizure ratio in two base stations；Or, logical The the second switching request message (Handover Require) for crossing S1 interfaces sends second community channel seizure ratio to the second base station Request passes through the second switching response message (Handover of S1 interfaces wherein carrying second community channel seizure ratio request mark Command it) receives the second base station and fed back second community channel seizure ratio is asked based on the second community channel seizure ratio Relevant information.For example, the format of Handover Request Acknowledge is as follows：

For example, the message format of Handover Command is as follows：

When first base station determines that terminal is automatically switched, automatically switch request to the second base by the first of X2 interface It stands and sends channel seizure ratio request message, wherein carrying second community channel seizure ratio request mark, pass through the first of X2 interface Automatically switch the relevant information that response message receives the second community channel seizure ratio that the second base station is sent；Alternatively, being connect by S1 The second of mouth automatically switches request and sends channel seizure ratio request message to the second base station, wherein carrying second community channel occupancy Rate request mark automatically switches response message by the second of S1 interfaces and receives the second community channel occupancy that the second base station is sent The relevant information of rate.Wherein, wherein described first, which automatically switches request and second, automatically switches to go back the upper of carried terminal in request The contextual information of context information, the terminal is that existing base station carries out the required information of cell switching.

During tradition switching or terminal automatically switch, first base station is accounted for by the channel that S1 or X2 interface are sent to the second base station With rate request message, with ask second community feed back second community channel seizure ratio relevant information.

Wherein, channel seizure ratio request message carries second community channel seizure ratio request mark, and the second base station is based on should Channel seizure ratio request mark will purposefully indicate that the channel seizure ratio of corresponding second community letter is rung by channel seizure ratio Answer message feedback to first base station.

After the relevant information for getting the channel seizure ratio of second community to the second base station in first base station, which is believed Breath is sent to terminal, so that the relevant information of terminal channel occupancy preferentially chooses to be switched Target cell.Wherein, to terminal The method for sending channel seizure ratio relevant information can be divided into two kinds.

The relevant information of the channel seizure ratio of the second community of acquisition is periodically sent to terminal by method one；

Method two, when terminal switches, first base station is by the relevant information of the channel seizure ratio of the second community got It is sent to terminal.

In method one, first base station can be broadcast the message by the public system of the accessed cell of terminal by the second of acquisition The channel seizure ratio relevant information of cell is sent to terminal, it is preferred that by SIB1 or SIB2, or passes through Mutlefire cells In SIB-MF be sent to terminal.

Wherein, method one further includes following two modes：

Mode one：The relevant information of the channel seizure ratio of the second community received is included in channel seizure ratio instruction hair Terminal is given, so that terminal indicates the Target cell of selection switching according to channel seizure ratio；

Specifically, first base station sends the letter of second community by RRCReConfiguration (RRC is reconfigured) message The relevant information of road occupancy.Wherein, the mode of the relevant information of the channel seizure ratio in RRCReConfiguration can be with It is diversified.For example, the channel occupancy rate score of first community can be directly contained in RRC and re-matched with explicit notification It sets and is sent to terminal in message；Can also implicitly notify, by second community mark by channel seizure ratio from high to low or from as low as High sequence (i.e. the channel seizure ratio comparing result of second community) is included in RRC reconfiguration messages and is sent to terminal.

It further, can be only by measurement report indicated the if first base station receives the measurement report of terminal The relevant information of the channel seizure ratio of two cells, which is included in RRC reconfiguration messages, is sent to terminal, and mode one is used for terminal certainly Dynamic handoff procedure, measurement report is the measurement report automatically switched for terminal.

Mode two：First base station, will for terminal selection according to the relevant information of the channel seizure ratio of the second community of reception Target Cell Identifier is included in cell switching instruction is sent to terminal later, terminal is made to be directed to by the Target cell to be switched Target cell in cell switching instruction initiates cell access request.

Wherein, the second community that first base station can select the channel seizure ratio received from the second base station minimum is as terminal Target Cell Identifier is included in indication message and is sent to terminal (for example, switching in tradition by the Target cell of switching In, cell switching instruction, which is included in switching command message, is sent to terminal).

Further, first base station can also select a channel to account in the second community for meeting preset channel quality The Target cell that the second community for using rate minimum switches as terminal；It is specified in another example first base station meets in channel seizure ratio In the second community of threshold value, the Target cell for selecting a highest cell of signal quality to be switched as terminal, which is fitted Traditional switching flow for the prior art.

Obviously it is based on foregoing description, in this practical application two, if end side selection target cell, corresponding switching flow It can be as shown in Figure 4；If first base station replaces terminal selection target cell, corresponding switching flow can be as shown in Figure 5.

In addition, another embodiment of the present invention also provides a kind of terminal, which accesses first community, as shown in fig. 6, packet It includes：

Transceiver, memory, actuator and processor；

The memory stores software program；

The processor by run the software program for：

Obviously, the terminal of the present embodiment can preferentially choose the lower adjacent cell of channel seizure ratio and switch over, to carry The success rate of high switching cell, and avoid the delay generated by handover failure.For user experience, there is important change Good will justice.

As exemplary introduction, the relevant information can be：The channel seizure ratio of at least one second community Or channel seizure ratio comparing result；The processor specifically controls the transceiver from described the by running the software program Institute is obtained in the RRC reconfiguration messages that the base station of one cell is sent or in public system broadcast message SIB1, SIB2 or SIB-MF State the channel seizure ratio or channel seizure ratio comparing result of at least one second community.

Or the relevant information can be：The measurement configuration information of at least one second community；Accordingly, institute It states processor and specifically controls the RRC weights that the transceiver is sent from the base station of the first community by running the software program In configuration message or terminal obtains institute from the public system broadcast message SIB3 or SIB5 that the base station of the first community is sent State the measurement configuration information of at least one second community.

Wherein, the processor is by running the software program, according to the measurement of at least one second community Configuration information determines the channel seizure ratio of at least one second community, including：

According to the measurement configuration information, the time window of the DMTC of second community is determined, and in the DMTC of second community Time window in, receive the discovery reference signal DRS that each second community is initiated；

Terminal determines it in preset time for the successful receiving rate of the DRS of each second community；Each second community The successful receiving rate of DRS be equal to the secondary of the DMTC with DRS that terminal is detected in preset time for the second community The ratio of number and the sum of the time window of DMTC in the preset time；

According to the DRS successful receiving rates of each second community, quantify the channel seizure ratio for each second community.

Wherein, the processor is by running the software program, according to the channel of at least one second community Occupancy, choose a second community includes as Target cell：

In the second community that channel seizure ratio meets the first preset requirement, it is small to choose a signal strength highest second Area is as Target cell；Or

In the second community that signal strength meets the second preset requirement, minimum second small of a channel seizure ratio is chosen Area is as Target cell.

Wherein, the processor is by running the software program, according to the channel of at least one second community Occupancy comparing result chooses a second community as Target cell at least one second community, including：

In addition, the relevant information of the present embodiment can also include：The base station of first community is according to described at least one Second community channel seizure ratio determine Target cell；

I.e. above-mentioned processor can be also used for by running the software program：

According to the relevant information, that directly chooses that the base station of first community sends is small according to described at least one second The Target cell that the channel seizure ratio in area determines.

It should be noted that in practical applications, the processor of the present embodiment is not necessarily required to choose one second small Area initiates switching, such as when the channel seizure ratios of all second communities is not up to benchmark and requires, then can not choose target Cell can still maintain access first community in this case.Alternatively, the present invention can also by the second community preferentially selected with First community is compared, and when the channel seizure ratio of the second community preferentially selected is better than first community, just can be by it As Target cell and switch over.

It is cut in addition, the terminal of the present embodiment can choose Target cell in the base station of other required by first base station It changes, i.e., the processor of the present embodiment is additionally operable to by running the software program：

Control the second community list that the transceiver is sent to the terminal, the second community list instruction terminal energy The second community enough switched, so that channel seizure ratio or channel of the terminal according at least one second community Occupancy comparing result selects a second community for belonging to the second community list as Target cell.

Obviously, the terminal of the present embodiment is corresponding with the above-mentioned cell switching method of application terminal side of offer of the present invention, Therefore identical technique effect can be realized.Furthermore, it is necessary to which description-based be, the terminal of the present embodiment can be mobile electricity Phone (or mobile phone) or other equipment that can send or receive wireless signal, including user equipment, personal digital assistant, Wireless modem, wireless communication device, hand-held device, laptop computer, wireless phone, wireless local loop station, energy It is enough by movable signal be converted to wifi signals CPE or Mifi, intelligent appliance or other obstructed remarkable operations can it is spontaneous and The equipment etc. of mobile communications network communication.

In addition, another embodiment of the present invention also provides a kind of base station, which has first community, as shown in fig. 7, packet It includes：

Transceiver, memory and processor；

The memory stores software program；

The processor by run the software program for：

Obviously, the related letter of the adjacent cell of other base stations can be provided in the base station of the present embodiment to the terminal under its cell Breath so that terminal can be according to channel seizure ratio between channel seizure ratio or adjacent cell of the relevant information to determine adjacent cell Comparing result is preferentially chosen cell so as to being based on channel seizure ratio and is switched over.

Specifically, the processor of the present embodiment by run the software program control the transceiver its to access first The terminal of cell sends the relevant information of at least one second community, including：

As exemplary introduction, the relevant information of the present embodiment can be：The channel of at least one second community Occupancy or channel seizure ratio comparing result；

Then processor controls the transceiver by running the software program, by least one second community Channel seizure ratio or channel seizure ratio comparing result be encapsulated in RRC reconfiguration messages or public system broadcast message SIB1, After in SIB2 or SIB-MF, the RRC reconfiguration messages are sent to the terminal.

Alternatively, the relevant information of the present embodiment can be：The discovery signal measurement of at least one second community is matched Confidence ceases；

Then processor controls the transceiver by running the software program, by least one second community After measurement configuration information is encapsulated in RRC reconfiguration messages, the RRC reconfiguration messages are sent to the terminal；Or

Processor controls the transceiver by running the software program, by the survey of at least one second community After amount configuration information is encapsulated in public system broadcast message SIB3 or SIB5, by public system broadcast message SIB3 or SIB5 It is sent to the terminal.

In addition, it is small to access first to control the transceiver by running the software program for the processor of the present embodiment Before the terminal in area sends the relevant information of at least one second community, transceiver is also controlled to described at least one second The base station of cell obtains the channel seizure ratio of at least one second community, described at least one according to getting later The channel seizure ratio of second community generates the relevant information.

Wherein, reason device controls the transceiver at least one second community by running the software program Base station obtain the channel seizure ratio of at least one second community, including：

By S1 interfaces or X2 interface channel seizure ratio request is sent to the base station of at least one second community Message, and receive the letter that the base station of at least one second community is fed back to according to the channel seizure ratio request message Road occupancy response message, the channel seizure ratio response message include the channel seizure ratio of the second community.

In addition, the processor of the present embodiment is additionally operable to by running the software program：

It controls the transceiver and sends second community list to the terminal, the second community list instruction terminal can The second community of switching so that terminal is compared according to the channel seizure ratio or channel seizure ratio of at least one second community As a result, selecting a second community for belonging to the second community list as Target cell.

In addition, the processor of embodiment is additionally operable to by running the software program：The transceiver is being controlled to terminal Before the relevant information for sending at least one second community, receive the terminal transmission is directed at least one second community Measurement report.

In practical applications, processor can be accounted for the channel of selected second community in transceiver to feedback measurement report With rate or channel seizure ratio comparing result.

Certainly, the processor of the present embodiment is additionally operable to by running the software program：The transceiver is controlled to described The base station of at least one second community sends the channel seizure ratio of the first community, so that the base station of second community can To send the channel seizure ratio or channel seizure ratio comparing result of second community to the other-end belonging to it.

Using the Target cell chosen according to the channel seizure ratio of at least one second community as the related letter Breath, and it is sent to the terminal by special RRC message message so that the terminal is directly initiated to disappear for the RRC The cell access request of Target cell in breath.

Obviously, the base station of the present embodiment is corresponding with the cell switching method of base station side provided by the invention, therefore can Realize identical technique effect.

The above is the preferred embodiment of the present invention, it is noted that for those skilled in the art For, without departing from the principles of the present invention, it can also make several improvements and retouch, these improvements and modifications It should be regarded as protection scope of the present invention.

In conclusion the embodiment of the present invention provides a kind of cell switching method, it is applied to terminal, the terminal access the One cell, including：

Terminal initiates the cell access request for the Target cell.

Wherein, the relevant information is：The measurement configuration information of at least one second community；

Terminal is from the RRC reconfiguration messages that the base station of the first community is sent or terminal is from the first community The measuring configuration letter of at least one second community is obtained in the public system broadcast message SIB3 or SIB5 that base station is sent Breath.

Wherein, terminal is according to the measurement configuration information of at least one second community, determine this at least one The channel seizure ratio of two cells, including：

Terminal determines the time window of the DMTC of second community, and in second community according to the measurement configuration information In the time window of DMTC, the discovery reference signal DRS that each second community is initiated is received；

Terminal quantifies the channel seizure ratio for each second community according to the DRS successful receiving rates of each second community.

Wherein, terminal chooses a second community conduct according to the channel seizure ratio of at least one second community Target cell includes：

Terminal chooses a signal strength highest the in the second community that channel seizure ratio meets the first preset requirement Two cells are as Target cell；Or

Terminal in the second community that signal strength meets the second preset requirement, choose a channel seizure ratio it is minimum the Two cells are as Target cell.

Wherein, terminal is according to the channel seizure ratio comparing result of at least one second community, described at least one In a second community, a second community is chosen as Target cell, including：

Wherein, the relevant information further includes：The base station of first community is according to the letter of at least one second community The Target cell that road occupancy determines；

Terminal chooses a second community as Target cell, including：

Terminal according to the relevant information, directly choose that the base station of first community sends according to described at least one the The Target cell that the channel seizure ratio of two cells determines.

Wherein, described in terminal is obtained from the dedicated radio resources control RRC information that the base station of the first community is sent Relevant information includes：

Terminal sends the measurement report at least one second community to the base station of first community；Make described first The base station of cell generates a RRC information for carrying the relevant information according to the measurement report；

Terminal receives the RRC information transmitted by the base station of the first community, and the phase is obtained from the RRC information Close information.

Wherein, terminal is according to the channel seizure ratio or channel seizure ratio comparing result of at least one second community, A second community is chosen as Target cell, including：

Terminal receives the second community list transmitted by the base station of first community, the second community list instruction terminal energy The second community enough switched；

Terminal selects one according to the channel seizure ratio or channel seizure ratio comparing result of at least one second community Second community in a second community list is as Target cell.

In addition, another embodiment of the present invention also provides a kind of cell switching method, it is applied to the base station of first community, packet It includes：

The base station of first community is tied by the channel seizure ratio of at least one second community or channel seizure ratio comparison Fruit is encapsulated in RRC reconfiguration messages, or be encapsulated in public system broadcast message SIB1, SIB2 or SIB-MF after, by the RRC Reconfiguration message or public system broadcast message are sent to the terminal.

The measurement configuration information of at least one second community is encapsulated in RRC and reconfigured by the base station of first community to disappear After breath, the RRC reconfiguration messages are sent to the terminal；Or

It is wide that the measurement configuration information of at least one second community is encapsulated in public system by the base station of first community After broadcasting message SIB3 or SIB5, public system broadcast message SIB3 or SIB5 is sent to the terminal.

Wherein, the base station of first community sends the related letter of at least one second community to the terminal of access first community Before breath, further include：

The base station of first community obtains at least one second community to the base station of at least one second community Channel seizure ratio；

The base station of first community is according to the channel seizure ratio of at least one second community got, described in generation Relevant information.

Wherein, the base station of first community to the base station of at least one second community obtain this at least one second The channel seizure ratio of cell, including：

The base station of first community sends one by S1 interfaces or X2 interface to the base station of at least one second community Channel seizure ratio request message, and the base station of reception at least one second community disappear according to channel seizure ratio request The fed back to channel seizure ratio response message of breath, the channel seizure ratio response message include that the channel of the second community accounts for With rate.

Wherein, the base station of first community sends a channel by X2 interface to the base station of at least one second community Occupancy request message, and the base station of at least one second community is received according to the channel seizure ratio request message institute The channel seizure ratio response message fed back to, including：

The base station of first community is disappeared channel seizure ratio request by the first automatic switchover demand signalling of X2 interface Breath is sent to the base station of at least one second community, wherein also carries the terminal in the automatic switchover request Contextual information, and obtained by X2 interface and rung comprising the channel seizure ratio by what at least one second community was sent The first of message is answered to automatically switch request response signaling.

Wherein, the base station of first community sends a channel by S1 interfaces to the base station of at least one second community Occupancy request message, and the base station of at least one second community is received according to the channel seizure ratio request message institute The channel seizure ratio response message fed back to, including：

The base station of first community is disappeared channel seizure ratio request by the second automatic switchover demand signalling of S1 interfaces Breath is sent to the base station of at least one second community, wherein described second automatically switches also to carry the end in request The contextual information at end, and it includes the channel occupancy to be obtained by least one second community transmission by S1 interfaces The second of rate response message automatically switches response signaling.

Wherein, it is at least one to the base station of at least one second community to obtain this for the base station of the first community The channel seizure ratio of second community further includes：

The base station of the first community receives the base by least one second community by S1 interfaces or X2 interface Stand send channel seizure ratio instruction message, wherein include the letter of the second community in the channel seizure ratio instruction message Road occupancy.

Wherein, the base station of the first community is by S1 interfaces or X2 interface, receives small by described at least one second The channel seizure ratio instruction message that the base station in area is sent, including：

ENB the configuration update or eNB that the base station of the first community passes through X2 interface Configuration update acknowledge signalings are received by the base station transmission of at least one second community Channel seizure ratio instruction message.

Wherein, the cell switching method further includes：

The base station of first community sends second community list to the terminal, and the second community list instruction terminal can The second community of switching so that terminal is compared according to the channel seizure ratio or channel seizure ratio of at least one second community As a result, selecting a second community for belonging to the second community list as Target cell.

Wherein, before the base station of first community sends the relevant information of at least one second community to terminal, the side Method further includes：

Receive the measurement report at least one second community that the terminal is sent.

Wherein, the base station of first community sends the letter of the first community to the base station of at least one second community Road occupancy.

Wherein, the cell switching method further includes：

First community base station Target cell is chosen according to the channel seizure ratio of at least one second community；

The base station of the first community sends the related letter of at least one second community to the terminal of access first community Breath includes：

The Target cell that the base station of first community will be chosen according to the channel seizure ratio of at least one second community It is sent to the terminal by special RRC message as the relevant information, and by it so that the terminal is directly initiated to be directed to institute State the cell access request of the Target cell in RRC information.

Transceiver, memory, actuator and processor；

The memory stores software program；

The processor by run the software program for：

The processor specifically controls the transceiver from the base station of the first community by running the software program In the RRC reconfiguration messages of transmission or public system that terminal is sent from the base station of first community broadcast message SIB3 or The measurement configuration information of at least one second community is obtained in SIB5.

The processor is additionally operable to by running the software program：

Wherein, the processor is additionally operable to by running the software program：

Transceiver, memory and processor；

The memory stores software program；

The processor by run the software program for：

The processor controls the transceiver by running the software program, by least one second community Channel seizure ratio or channel seizure ratio comparing result be encapsulated in RRC reconfiguration messages or public system broadcast message SIB1, After in SIB2 or SIB-MF, the RRC reconfiguration messages or public system broadcast message are sent to the terminal.

The processor controls the transceiver by running the software program, by least one second community Measurement configuration information be encapsulated in RRC reconfiguration messages after, the RRC reconfiguration messages are sent to the terminal；Or

The processor controls the transceiver by running the software program, by least one second community Measurement configuration information be encapsulated in public system broadcast message SIB3 or SIB5 after, by the public system broadcast the message SIB3 or SIB5 is sent to the terminal.

Wherein, the processor controls end of the transceiver to access first community by running the software program Before end sends the relevant information of at least one second community, it is small to described at least one second also to control the transceiver The base station in area obtains the channel seizure ratio of at least one second community, later according to described at least one the got The channel seizure ratio of two cells generates the relevant information.

Wherein, the processor is by running the software program, controls the transceiver to described at least one the The base station of two cells obtains the channel seizure ratio of at least one second community, including：

Before controlling the transceiver and sending the relevant information of at least one second community to terminal, the end is received Hold the measurement report at least one second community sent.

It controls the transceiver and sends the channel of the first community to the base station of at least one second community and account for With rate.

Using the Target cell chosen according to the channel seizure ratio of at least one second community as the related letter Breath, and it is sent to the terminal by special RRC message so that the terminal is directly initiated in the RRC information Target cell cell access request.

Claims

1. a kind of cell switching method, is applied to terminal, the terminal accesses first community, which is characterized in that including：

Terminal obtains the relevant information of at least one second community by the base station of first community, and each second community is institute The adjacent cell of first community is stated, and belongs to different base stations from the first community；

Terminal determines the channel seizure ratio or channel seizure ratio of at least one second community according to the relevant information Comparing result；

Terminal chooses one the according to the channel seizure ratio or channel seizure ratio comparing result of at least one second community Two cells are as Target cell；

Terminal initiates the cell access request for the Target cell.

2. cell switching method according to claim 1, which is characterized in that

Terminal obtains the relevant information of at least one second community to the base station of first community, including：

Terminal obtains the relevant information from the dedicated radio resources control RRC information that the base station of the first community is sent； Or

3. cell switching method according to claim 2, which is characterized in that

The relevant information is：The channel seizure ratio or channel seizure ratio comparing result of at least one second community；

Terminal is sent from the RRC reconfiguration messages that the base station of the first community is sent, or from the base station of the first community Public system broadcast message SIB1, SIB2 or SIB-MF in obtain at least one second community channel seizure ratio or Channel seizure ratio comparing result.

4. a kind of cell switching method is applied to the base station of first community, which is characterized in that including：

The base station of first community sends the relevant information of at least one second community to the terminal of access first community so that institute It states terminal and determines that the channel seizure ratio of at least one second community or channel seizure ratio compare according to the relevant information As a result, and according to the channel seizure ratio or channel seizure ratio comparing result of at least one second community, selecting one the Two cells are as Target cell to be accessed.

5. cell switching method according to claim 4, which is characterized in that

The base station of first community sends the relevant information of at least one second community to the terminal of access first community, including：

The base station of first community controls RRC information by dedicated radio resources, or is broadcast the message the phase by public system It closes information and is sent to the terminal.

6. a kind of terminal, the terminal accesses first community, which is characterized in that including：

Transceiver, memory, actuator and processor；

The memory stores software program；

The processor by run the software program for：

Control the relevant information that the transceiver obtains at least one second community by the base station of first community, each second Cell is the adjacent cell of the first community, and belongs to different base stations from the first community；

According to the relevant information, channel seizure ratio or the channel seizure ratio comparison of at least one second community are determined As a result；

According to the channel seizure ratio or channel seizure ratio comparing result of at least one second community, choose one second small Area is as Target cell；

7. terminal according to claim 6, which is characterized in that

The processor specifically controls the transceiver by the operation software program and is obtained at least to the base station of first community The relevant information of one second community, including：

The relevant information is obtained from the dedicated radio resources control RRC information that the base station of the first community is sent；Or

8. terminal according to claim 7, which is characterized in that

The processor specifically controls the transceiver from the transmission of the base station of the first community by running the software program RRC reconfiguration messages in or public system broadcast message SIB1, SIB2 or SIB-MF in obtain described at least one second The channel seizure ratio or channel seizure ratio comparing result of cell.

9. a kind of base station, the base station has first community, which is characterized in that including：

Transceiver, memory and processor；

The memory stores software program；

The processor by run the software program for：

Controlling the transceiver, it sends the relevant information of at least one second community to the terminal of access first community so that The terminal determines the channel seizure ratio or channel seizure ratio pair of at least one second community according to the relevant information Than as a result, and according to the channel seizure ratio of at least one second community or channel seizure ratio comparing result, selecting one the Two cells are as Target cell to be accessed.

10. base station according to claim 9, which is characterized in that

The processor controls the transceiver it is sent to the terminal of access first community by running the software program The relevant information of few one second community, including：

RRC information is controlled by dedicated radio resources, or is broadcast the message by public system and the relevant information is sent to institute State terminal.