CN105050141A - Cell handover method and base station thereof - Google Patents
Cell handover method and base station thereof Download PDFInfo
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- CN105050141A CN105050141A CN201510497074.5A CN201510497074A CN105050141A CN 105050141 A CN105050141 A CN 105050141A CN 201510497074 A CN201510497074 A CN 201510497074A CN 105050141 A CN105050141 A CN 105050141A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/08—Reselecting an access point
Abstract
The invention discloses a cell handover method and a base station thereof. The method comprises the following steps that a source base station obtains a measurement report, which is reported by user equipment UE within a preset time bucket, wherein the measurement report comprises a receiving signal quality value of each measurement cell; the source base station determines a change value of the receiving signal quality value of each measurement cell within the set time bucket according to the measurement report; the source base station determines the measurement cell with the maximum change value of the receiving signal quality value as a target cell of the UE; and when the source base station determines that the target cell meets handover decision conditions, the source base station executes cell handover for the UE. The cell handover method and the base station thereof are used for solving a problem of frequent handover of the UE in an overlapping region in the prior art.
Description
Technical field
The invention belongs to communication technical field, relate to a kind of cell switching method and base station thereof.
Background technology
In a wireless communication system, when UE is in edge, Serving cell, because the signal quality of Serving cell dies down, the signal quality grow of neighbor cell, UE reporting measurement reports can be triggered, whether serving BS can carry out cell merge according to measurement report judgement, namely completes the conversion of the channel of UE and base station.In other words, when UE leaves a community, and when entering into another one community, along with the enhancing with another cell signal that weakens of a cell signal, handoff procedure can be triggered in the base station that the cell signal weakened is corresponding, makes UE be switched to the strong community of signal.In order to realize the conversation continuity of UE at handoff procedure, the technology that takes over seamlessly is own through becoming the hot spot technology studied now.
Following problems may be encountered in application process for existing handoff technique: when UE is in the crossover region of community, so-called crossover region refers in a community and is provided with multiple base station, cause in community the situation that there is multiple base station and repeat to cover, the UE namely in crossover region can detect the signal of multiple base station.Now UE is when carrying out cell merge, there will be after UE is switched to a community, is switched to again another community very soon, recurs and repeatedly switch under new base station.This within a short period of time switches continuously, and the number of times of handoff failure can increase, and too increases signaling consumption simultaneously.Therefore a kind of problem that can solve UE and frequently switch at crossover region is needed badly.
Summary of the invention
The embodiment of the present invention provides a kind of cell switching method and base station thereof, in order to solve the problem that in prior art, UE frequently switches at crossover region.
The inventive method comprises a kind of cell switching method, and the method comprises: source base station obtains the measurement report that user equipment (UE) reports in setting-up time section, and described measurement report comprises the received signal quality value of each measurement community; Described source base station, according to described measurement report, determines the changing value of the received signal quality value of each measurement community in described setting-up time section; Measurement community maximum for the changing value of received signal quality value is defined as the Target cell of described UE by described source base station; When described source base station determines that described Target cell meets switch decision condition, for described UE performs cell merge.
Wherein, if described source base station determines that described Target cell does not meet switch decision condition, then described source base station is according to the changing value configuration handoff parameter of the received signal quality value of described Target cell; Described handoff parameter is sent to described UE by measuring configuration messages by described source base station.
Further, described handoff parameter comprise following one of at least: independent offset amount, triggered time, lag parameter; According to the changing value of received signal quality value preset and the corresponding relation of handover parameter values, determine the handover parameter values of described Target cell.
Further, described source base station is according to described measurement report, determine the changing value of the received signal quality value of each measurement community in described setting-up time section, comprise: the measurement report reported in described setting-up time section has N number of, and N number of measurement report is last measurement report reported in described setting-up time section; For each measurement community, the changing value of received signal quality value measuring community is determined: to the smoothing process of received signal quality value of N-1 measurement report before N number of measurement report of this measurement community, obtain the mean value of the received signal quality value of N-1 measurement report according to following method; According to the mean value of the received signal quality value of the received signal quality value of this measurement community in N number of measurement report and a described N-1 measurement report, obtain the changing value of the received signal quality value of this measurement community.
Further, the smoothing process of received signal quality value of N-1 measurement report before described N number of measurement report to this measurement community, comprise: source base station is by the received signal quality value of N-1 measurement report before N number of measurement report of acquisition by obtaining the received signal quality value mean value of described measurement community after smoothing filter process, described smoothing filter model is as shown in the formula shown in [5].
Based on same inventive concept, the embodiment of the present invention also provides a kind of base station, comprising: acquiring unit, and for obtaining the measurement report that UE reports in setting-up time section, described measurement report comprises the received signal quality value of each measurement community; First determining unit, for according to described measurement report, determines the changing value of the received signal quality value of each measurement community in described setting-up time section; Second determining unit, for being defined as the switching target small area of described UE by measurement community maximum for the changing value of received signal quality value; Switch decision unit, during for determining that described Target cell meets switch decision condition, for described UE performs cell merge.
Wherein, described base station also comprises: handoff parameter adjustment unit, if for not meeting switch decision condition, according to the changing value configuration handoff parameter of the received signal quality value of described switching target small area, described handoff parameter is used for source base station and is sent to described UE by measuring configuration messages.
Wherein, described handoff parameter adjustment unit specifically for: described handoff parameter comprise following one of at least: independent offset amount, triggered time, lag parameter; According to the changing value of received signal quality value preset and the corresponding relation of handover parameter values, determine the handover parameter values of described Target cell.
Described first determining unit specifically for: the measurement report reported in described setting-up time section has N number of, and N number of measurement report is last measurement report reported in described setting-up time section; For each measurement community, the changing value of received signal quality value measuring community is determined: to the smoothing process of received signal power value of N-1 measurement report before N number of measurement report of this measurement community, obtain the mean value of the received signal power value of N-1 measurement report according to following method; According to the mean value of the received signal power value of the received signal power value of this measurement community in N number of measurement report and a described N-1 measurement report, obtain the changing value of the received signal quality value of this measurement community.
Described base station further, also comprise: smoothing processing unit, for the received signal quality value of N-1 measurement report before N number of measurement report that will obtain by obtaining the received signal quality value mean value of described measurement community after smoothing filter process, described smoothing filter model is as shown in the formula shown in [5].
In the embodiment of the present invention, source base station obtains the received signal quality value of the measurement community that UE reported in setting-up time section before current time on the one hand, the changing value of the received signal quality value of Nei Ge community, described measurement community is determined according to the received signal quality value of described measurement community, judge the maximum in the changing value of the received signal quality value of each community on the other hand, then determine according to the maximum in the changing value of received signal power value the Target cell that UE switches, when source base station determines that described switching target small area meets switch decision condition and just can perform switching in notification target community further.In the embodiment of the present invention, source base station determines the changing value of the received signal quality value of each measurement community according to the measurement report that UE reports, namely by analyzing the measurement report in a period of time, the moving direction of terminal can be inferred, according to moving direction select target community, avoid the problem that UE frequently switches at crossover region, decrease switching times, reduce signaling consumption, improve the success rate of switching.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme in the embodiment of the present invention, below the accompanying drawing used required in describing embodiment is briefly introduced, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is that UE moves schematic diagram at crossover region;
Fig. 2 provides a kind of method flow schematic diagram of cell merge for the embodiment of the present invention;
The reciprocal process schematic diagram that Fig. 3 provides a kind of UE for the embodiment of the present invention and measures between community;
Fig. 4 also provides a kind of base station for the embodiment of the present invention.
Embodiment
In order to make the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, the present invention is described in further detail, and obviously, described embodiment is only a part of embodiment of the present invention, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making other embodiments all obtained under creative work prerequisite, belong to the scope of protection of the invention.
In the embodiment of the present invention, source base station refers to the base station that the Serving cell at active user's terminal (UE) place is corresponding; Target BS refers to the community that will to switch after UE will leave cell-of-origin and to enter i.e. the base station corresponding to Target cell;
In addition, in prior wireless network, adopt multiple cell merge mode, comprise mobile handoff, based on the switching of load congestion control, the switching etc. based on interference, wherein modal cell merge mode is mobile handoff.
Below, be that example introduces cell switch determining method in detail with LTE (LongTermEvolution, Long Term Evolution) network, mainly comprise the steps:
Step 1, triggering are measured;
When the RSRP (ReferenceSignalReceivingPower, Reference Signal Received Power) of Serving cell lower than certain thresholding time, UE starts the RSRP measuring neighbor cell.RSRP also can be described as reference signal field intensity, is one of key parameter representing wireless signal strength in LTE network.
Step 2, measurement report;
If neighbor cell meets RSRP report condition, UE reports its RSRP measured value to network side.RSRP report condition can be the RSRP of RSRP higher than Serving cell of neighbor cell.Conventional RSRP report condition, can as shown in formula [1]:
10logRSRP
N+off
N-Hys>10logRSRP
S+off
S......[1]
Wherein, RSRP
nrepresent the RSRP measured value of neighbor cell; RSRP
srepresent the RSRP measured value of Serving cell; off
nrepresent adjacent cell frequencies special tolerances; off
srepresent Serving cell frequency special tolerances; Hys represents lag parameter.
When meeting RSRP report condition in neighbor cell, UE reports RSRP measurement result to network side, and RSRP measurement result comprises the RSRP of Serving cell and meets the RSRP of neighbor cell of RSRP report condition.
Step 3, switch decision;
The RSRP measurement result that network side reports according to UE carries out switch decision.Switch decision follow formula [2]:
RSRP_S<TH_Scell......[2]
Wherein, RSRP_S represents the RSRP of Serving cell; TH_Scell represents the RSRP decision threshold of Serving cell, and value can set according to actual needs; When RSRP_S is less than TH_Scell, meet switch decision condition, the flow processs such as so far, cell switch determining flow process terminates, the distribution of follow-up target approach local resource.
Consider that above-mentioned existing community judging process is less than threshold value as the judgment condition switched using the RSRP of current service cell, when UE is in crossover region, as shown in Figure 1, will exist when UE is in the process of community C movement, first the RSRP measured value recording community B increases, the RSRP of current service cell A is less than threshold value, therefore switch to community B, when UE continues the RSRP measured value increase that movement can record community C, the RSRP of current service cell B is less than threshold value, therefore community C is switched to again, there is frequent switching as seen, in order to avoid there is this phenomenon, embodiments provide a kind of method and base station thereof of cell merge, particular content is as follows.
Shown in Figure 2, the embodiment of the present invention provides a kind of method flow schematic diagram of cell merge, and this flow process can be realized by base station in service sector, and implementation method comprises particularly:
Step S101, source base station obtains the measurement report that UE reports in setting-up time section, and described measurement report comprises the received signal quality value of each measurement community.
Step S102, described source base station, according to described measurement report, determines the changing value of the received signal quality value of each measurement community in described setting-up time section.
Step S103, measurement community maximum for the changing value of received signal quality value is defined as the switching target small area of described UE by described source base station.
Step S104, when described source base station determines that described Target cell meets switch decision condition, for described UE performs cell merge.
Among execution step S101, the measurement report reported in described setting-up time section has N number of, and N number of measurement report is last measurement report reported in described setting-up time section; Described received signal quality value can be signal power value, at LTE middle finger is exactly RSRP value, at 3G (3rd-Generation) network middle finger is exactly RSCP (received signal code power), also can be RSRQ (Reference Signal Received Quality).Described measurement community refers to Serving cell and the adjacent cell of UE current service.
When source base station obtains the Serving cell of current service and the received signal quality value of adjacent cell, determine the changing value of the received signal quality value of each measurement community, particularly, the determination mode of changing value can have two kinds, and first kind of way is the received signal power value of N number of measurement report of this measurement community and the difference of the received signal power value of N-1 the measurement report changing value as the received signal quality value of this measurement community; The second way be according to the received signal power value of N number of measurement report and N number of measurement report before the mean value of received signal power value of N-1 measurement report, obtain the changing value of the received signal quality value of this measurement community.
Particularly, the determination mode of the second way is as follows:
To the smoothing process of received signal power value of N-1 measurement report before N number of measurement report of this measurement community, obtain the mean value of the received signal power value of N-1 measurement report; According to the mean value of the received signal power value of the received signal power value of this measurement community in N number of measurement report and a described N-1 measurement report, obtain the changing value of the received signal quality value of this measurement community.
Wherein, the changing value of the received signal quality value of this measurement community can be ratio also can be difference, determines the changing value of the received signal quality value of described measurement community according to formula [3] or formula [4]:
ΔMeas＝M
meas(N)-D
meas(N)......[3]
Wherein, Δ Meas is expressed as the changing value of the received signal quality value measuring community, M
meas(N) received signal quality value of measurement community in N number of measurement report is expressed as, D
meas(N) mean value of the received signal quality value of a described n measurement report.
Wherein, D
meas(N) determination mode is obtained by smothing filtering, particularly, source base station by the received signal quality value of N-1 measurement report before N number of measurement report of obtaining by obtaining the received signal quality value mean value of described measurement community after smoothing filter process, described smoothing filter model as shown in the formula:
D
meas(N)＝k×D
meas(N-1)+(1-k)×M
meas(N-1)......[5]
Wherein, D
meas(N) represent the mean value of N-1 received signal quality value before N number of received signal quality value, k represents filter smoothing parameter, D
meas(N-1) mean value of N-1 received signal quality value N-2 received signal quality value is represented, M
meas(N-1) N-1 received signal quality value of the measurement community represented.
Like this, the changing value determined by the second way is more accurate, and changing value largest cell just can as the Target cell switched.
Such as, as shown in Figure 1, current UE is in crossover region, there is A around, B, C tri-communities, its small area A is the current service cell of UE, the base station that community A is corresponding is source base station, when UE moves at multiple cell fringe region, because met and measured report condition, continuous several times is sent measurement report and is reported to source base station by UE, source base station receives the measurement report of the continuous several times that same UE reports in setting-up time section, wherein the number of the measurement report of length needed for source base station of setting-up time section is determined, and the number of measurement report needed for source base station, the i.e. value of N, determined by the empirical value of practical operation.After source base station gets described measurement report, utilize the determination mode of above-mentioned changing value to obtain following table one.
Table one:
By measurement variation value in this form positive and negative known when changing value be move to its direction on the occasion of interval scale UE, otherwise be exactly away from, therefore can show that UE is away from community A, move to community B and community C, the changing value of its small area C is maximum, represents that UE is quick to be moved to community C.
Like this, source base station determines moving direction and the translational speed of UE according to the changing value of received signal quality value, and measurement community maximum for the changing value of received signal quality value is defined as the switching target small area of described UE, avoid the Target cell of community maximum for current RSRP measured value as switching in existing judgement mode, the determination mode of Target cell is rationalized more, thus effectively solves frequent switching, decrease switching times, reduce signaling consumption, improve the success rate of switching.
The received signal quality value determined in N number of measurement report when source base station meets switch decision condition and namely follows formula [2], then notify that the target BS in described Target cell performs switching.Handoff procedure is followed and is first carried out Resourse Distribute and reinform the flow processs such as UE switching particularly, same as the prior art, repeat no more, but when source base station determines that the received signal quality value in N number of measurement report does not meet switch decision condition, in order to switch to Target cell as early as possible, shorten switching to delay, the embodiment of the present invention provides the mode of adjustment handoff parameter further, and switch decision condition is met.
Concrete, described source base station is according to the changing value configuration handoff parameter of the received signal quality value of described switching target small area; Described handoff parameter is sent to described UE by measuring configuration messages by described source base station.
UE is according to the measurement report reported after handoff parameter adjustment measurement result; Then source base station again receives measurement report and judges whether to meet switching condition, if meet switching condition, then notification target community performs switching.
Wherein, described handoff parameter can be the one or more combination of independent offset amount (Ocn), triggered time (TTT), lag parameter, according to the changing value of received signal quality value preset and the corresponding relation of handover parameter values, determine the handover parameter values of described Target cell, wherein, the changing value of received signal quality value is larger, and the value of independent offset amount is larger, and the value of triggered time or sluggishness is less.The value of one or more combination of described independent offset amount, triggered time, lag parameter is adjusted when the changing value of the received signal quality value of switching target small area is larger, particularly, such as, changing value is divided into n interval, the value of different interval correspondences is different, and increase along with the increase of interval value, Ocn value mode is as shown in Table 2.
Table two:
| Target cell measurement variation value | The suggestion value of Ocn |
| (0，k1] | m 1 |
| (k1，k2] | m 2 |
| ... | ... |
| (kn，+∞] | m n |
Such as, when handoff parameter is Ocn, this parameter is issued to UE side by measuring configuration messages by source base station, and now UE meets measurement report report condition, and formula [1] is deformed into following formula [6]:
10logRSRP
N+off
N-Hys>10logRSRP
S+off
S-Ocn......[6]
Wherein, RSRP
nrepresent the RSRP measured value of neighbor cell; RSRP
srepresent the RSRP measured value of Serving cell; off
nrepresent adjacent cell frequencies special tolerances; off
srepresent Serving cell frequency special tolerances; Hys represents lag parameter, and Ocn represents the independent offset amount of neighbor cell.
Because Ocn is present in LTE with in switching frequently and alien frequencies switching.With when frequently switching, this value is added the event evaluation process of numerical value for UE of gained with actual measured value.This community original measurement value is added that this to be used for the same frequency switch decision of UE after biased as measurement result by UE.In handoff algorithms, play the effect on border, mobile cell, if wishing when configuring adjacent cell to switch easily occurs, can be made on the occasion of, otherwise be made into negative value.This optimum configurations is larger, then it is easier to switch, and the UE being in switching state is more, but takies forward direction resource; Arrange less, switch more difficult, likely affect the quality of reception.
The RSRP measurement result that source base station this time reports according to UE carries out switch decision, because source base station handoff parameter Ocn value is adjusted on the occasion of, the RSRP value of current service cell diminishes, and follows formula [2], and then enter follow-up switching flow to make meeting switch decision.
When UE is very fast to the speed of switching target small area movement, if can not switch in time, the phenomenons such as UE call drop or handoff failure may be caused, the effect done like this is, UE can be made to meet switching condition in time by adjustment handoff parameter to switch, avoid the problem of handover failure rate and call drop.
In order to the reciprocal process further describing above-mentioned handoff procedure UE and measure between community, the embodiment of the present invention provides Fig. 3 to further describe above-mentioned handoff procedure.
When the RSRP of Serving cell is lower than certain thresholding, UE start to measure neighbor cell RSRP and when meeting RSRP report condition, the RSRP of each community detected is reported to the source base station at place, current service cell by measurement report, neighbor cell 1 maximum for the changing value of received signal quality value is defined as the switching target small area of described UE by source base station, directly notify that when meeting switch decision condition neighbor cell 1 switches, if do not meet judgment condition, as shown in the figure, the handoff parameter of source base station adjustment neighbor cell 1, UE is sent to by measuring configuration messages, UE again meets RSRP report condition and reports the measurement result after according to handoff parameter adjustment, source base station receives this measurement report and carries out switch decision, determine to meet switching condition, therefore handover request is sent to neighbor cell 1, neighbor cell 1 finds that there is idling-resource therefore call access control, to source base station response handover request, and then source base station sends switching command to UE, complete and disconnect current service cell, the switching of access neighbor cell 1.
Based on identical technical conceive, the embodiment of the present invention also provides a kind of base station, and as shown in Figure 4, this base station comprises: acquiring unit 401, first determining unit 402, second determining unit 403, switch decision unit 404.
Acquiring unit 401, for obtaining the measurement report that UE reports in setting-up time section, described measurement report comprises the received signal quality value of each measurement community;
First determining unit 402, for according to described measurement report, determines the changing value of the received signal quality value of each measurement community in described setting-up time section;
Second determining unit 403, for being defined as the switching target small area of described UE by measurement community maximum for the changing value of received signal quality value;
Switch decision unit 404, for determining whether described switching target small area meets switch decision condition, if meet, then notifies that the target BS in described Target cell performs switching.
Wherein, the measurement report reported in described setting-up time section has N number of, and N number of measurement report is last measurement report reported in described setting-up time section; Described received signal quality value can be signal power value, at LTE middle finger is exactly RSRP value, at 3G (3rd-Generation) network middle finger is exactly RSCP (received signal code power), also can be RSRQ (Reference Signal Received Quality).Described measurement community refers to Serving cell and the adjacent cell of UE current service.
When source base station obtains the Serving cell of current service and the received signal quality value of adjacent cell, determine the changing value of the received signal quality value of each measurement community, particularly, the determination mode of changing value can have two kinds, and first kind of way is the received signal power value of N number of measurement report of this measurement community and the difference of the received signal power value of N-1 the measurement report changing value as the received signal quality value of this measurement community; The second way be according to the received signal power value of N number of measurement report and N number of measurement report before the mean value of received signal power value of N-1 measurement report, obtain the changing value of the received signal quality value of this measurement community.
Particularly, described first determining unit 402 specifically for: the measurement report reported in described setting-up time section has N number of, and N number of measurement report is last measurement report reported in described setting-up time section; For each measurement community, the changing value of received signal quality value measuring community is determined: to the smoothing process of received signal power value of N-1 measurement report before N number of measurement report of this measurement community, obtain the mean value of the received signal power value of N-1 measurement report according to following method; According to the mean value of the received signal power value of the received signal power value of this measurement community in N number of measurement report and a described N-1 measurement report, obtain the changing value of the received signal quality value of this measurement community, wherein changing value can difference or ratio, computing formula, as shown in formula [3] or formula [4], repeats no more.
Wherein, the mean value of the received signal power value of a described N-1 measurement report is obtained by smoothing processing cell processing, shown smoothing processing unit 405, for the received signal quality value of N-1 measurement report before N number of measurement report that will obtain by obtaining the received signal quality value mean value of described measurement community after smoothing filter process, described smoothing filter model is as shown in formula [5].
Like this, the changing value determined by the second way is more accurate, the Target cell that changing value largest cell just can switch the most, source base station determines moving direction and the translational speed of UE according to the changing value of received signal quality value, and measurement community maximum for the changing value of received signal quality value is defined as the switching target small area of described UE, the determination mode of Target cell is rationalized more, thus effectively solve frequent switching, decrease switching times, reduce signaling consumption, improve the success rate of switching.
The received signal quality value determined in N number of measurement report when source base station meets switch decision condition and namely follows formula [2], then notify that the target BS in described Target cell performs switching.Handoff procedure is followed and is first carried out Resourse Distribute and reinform the flow processs such as UE switching particularly, same as the prior art, repeat no more, but when source base station determines that the received signal quality value in N number of measurement report does not meet switch decision condition, in order to switch to Target cell as early as possible, shorten switching to delay, the embodiment of the present invention provide further described handoff parameter adjustment unit 406 specifically for:
Increase the value of one or more combination of the community independent offset amount of switching target small area, triggered time, lag parameter, according to the changing value of received signal quality value preset and the corresponding relation of handover parameter values, determine the handover parameter values of described Target cell, wherein, the changing value of received signal quality value is larger, the value of independent offset amount is larger, and the value of triggered time or sluggishness is less.The value of one or more combination of described independent offset amount, triggered time, lag parameter is adjusted when the changing value of the received signal quality value of switching target small area is larger.
The effect done like this is, when UE is very fast to the speed of switching target small area movement, if can not switch in time, the phenomenons such as UE call drop or handoff failure may be caused, the effect done like this is, UE can be made to meet switching condition in time by adjustment handoff parameter to switch, avoid the problem of handover failure rate and call drop.
The present invention describes with reference to according to the flow chart of the method for the embodiment of the present invention, equipment (system) and computer program and/or block diagram.Should understand can by the combination of the flow process in each flow process in computer program instructions realization flow figure and/or block diagram and/or square frame and flow chart and/or block diagram and/or square frame.These computer program instructions can being provided to the processor of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing device to produce a machine, making the instruction performed by the processor of computer or other programmable data processing device produce device for realizing the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.
These computer program instructions also can be stored in can in the computer-readable memory that works in a specific way of vectoring computer or other programmable data processing device, the instruction making to be stored in this computer-readable memory produces the manufacture comprising command device, and this command device realizes the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.
These computer program instructions also can be loaded in computer or other programmable data processing device, make on computer or other programmable devices, to perform sequence of operations step to produce computer implemented process, thus the instruction performed on computer or other programmable devices is provided for the step realizing the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.
Although describe the preferred embodiments of the present invention, those skilled in the art once obtain the basic creative concept of cicada, then can make other change and amendment to these embodiments.So claims are intended to be interpreted as comprising preferred embodiment and falling into all changes and the amendment of the scope of the invention.
Obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.
Claims (10)
1. a cell switching method, is characterized in that, the method comprises:
Source base station obtains the measurement report that user equipment (UE) reports in setting-up time section, and described measurement report comprises the received signal quality value of each measurement community;
Described source base station, according to described measurement report, determines the changing value of the received signal quality value of each measurement community in described setting-up time section;
Measurement community maximum for the changing value of received signal quality value is defined as the Target cell of described UE by described source base station;
When described source base station determines that described Target cell meets switch decision condition, for described UE performs cell merge.
2. the method for claim 1, is characterized in that, also comprises:
If described source base station determines that described Target cell does not meet switch decision condition, then described source base station is according to the changing value configuration handoff parameter of the received signal quality value of described Target cell;
Described handoff parameter is sent to described UE by measuring configuration messages by described source base station.
3. method as claimed in claim 2, is characterized in that, described source base station, according to the changing value configuration handoff parameter of the received signal quality value of described Target cell, comprising:
Described handoff parameter comprise following one of at least: independent offset amount, triggered time, lag parameter;
According to the changing value of received signal quality value preset and the corresponding relation of handover parameter values, determine the handover parameter values of described Target cell.
4. the method for claim 1, is characterized in that, described source base station, according to described measurement report, is determined the changing value of the received signal quality value of each measurement community in described setting-up time section, being comprised:
The measurement report reported in described setting-up time section has N number of, and N number of measurement report is last measurement report reported in described setting-up time section;
For each measurement community, determine the changing value of the received signal quality value measuring community according to following method:
To the smoothing process of received signal quality value of N-1 measurement report before N number of measurement report of this measurement community, obtain the mean value of the received signal quality value of N-1 measurement report;
According to the mean value of the received signal quality value of the received signal quality value of this measurement community in N number of measurement report and a described N-1 measurement report, obtain the changing value of the received signal quality value of this measurement community.
5. method as claimed in claim 4, is characterized in that, the smoothing process of received signal quality value of N-1 measurement report before described N number of measurement report to this measurement community, comprising:
Source base station by the received signal quality value of N-1 measurement report before N number of measurement report of obtaining by obtaining the received signal quality value mean value of described measurement community after smoothing filter process, described smoothing filter model as shown in the formula:
D
meas(N)＝k×D
meas(N-1)+(1-k)×M
meas(N-1)
Wherein, D
meas(N) represent the mean value of N-1 received signal quality value before N number of received signal quality value, k represents filter smoothing parameter, D
meas(N-1) mean value of N-2 received signal quality value before N-1 received signal quality value is represented, M
meas(N-1) N-1 received signal quality value of this measurement community is represented.
6. a base station, is characterized in that, comprising:
Acquiring unit, for obtaining the measurement report that UE reports in setting-up time section, described measurement report comprises the received signal quality value of each measurement community;
First determining unit, for according to described measurement report, determines the changing value of the received signal quality value of each measurement community in described setting-up time section;
Second determining unit, for being defined as the switching target small area of described UE by measurement community maximum for the changing value of received signal quality value;
Switch decision unit, during for determining that described Target cell meets switch decision condition, for described UE performs cell merge.
7. base station as claimed in claim 6, is characterized in that, also comprise:
Handoff parameter adjustment unit, if for not meeting switch decision condition, according to the changing value configuration handoff parameter of the received signal quality value of described switching target small area, described handoff parameter is used for source base station and is sent to described UE by measuring configuration messages.
8. base station as claimed in claim 7, is characterized in that, described handoff parameter adjustment unit specifically for:
Described handoff parameter comprise following one of at least: independent offset amount, triggered time, lag parameter;
According to the changing value of received signal quality value preset and the corresponding relation of handover parameter values, determine the handover parameter values of described Target cell.
9. base station as claimed in claim 6, is characterized in that, described first determining unit specifically for:
The measurement report reported in described setting-up time section has N number of, and N number of measurement report is last measurement report reported in described setting-up time section;
For each measurement community, determine the changing value of the received signal quality value measuring community according to following method:
To the smoothing process of received signal power value of N-1 measurement report before N number of measurement report of this measurement community, obtain the mean value of the received signal power value of N-1 measurement report;
According to the mean value of the received signal power value of the received signal power value of this measurement community in N number of measurement report and a described N-1 measurement report, obtain the changing value of the received signal quality value of this measurement community.
10. base station as claimed in claim 9, is characterized in that, also comprise:
Smoothing processing unit, for the received signal quality value of N-1 measurement report before N number of measurement report that will obtain by obtaining the received signal quality value mean value of described measurement community after smoothing filter process, described smoothing filter model as shown in the formula:
D
meas(N)＝k×D
meas(N-1)+(1-k)×M
meas(N-1)
Wherein, D
meas(N) represent the mean value of N-1 received signal quality value before N number of received signal quality value, k represents filter smoothing parameter, D
meas(N-1) mean value of N-1 received signal quality value N-2 received signal quality value is represented, M
meas(N-1) N-1 received signal quality value of the measurement community represented.
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