CN103987087B

CN103987087B - A kind of Mobile load balancing method and device

Info

Publication number: CN103987087B
Application number: CN201410213786.5A
Authority: CN
Inventors: 李红宏
Original assignee: China Academy of Telecommunications Technology CATT
Current assignee: China Academy of Telecommunications Technology CATT; Datang Mobile Communications Equipment Co Ltd
Priority date: 2014-05-20
Filing date: 2014-05-20
Publication date: 2017-10-20
Anticipated expiration: 2034-05-20
Also published as: CN103987087A

Abstract

The invention discloses a kind of Mobile load balancing method and device.In the present invention, cell in control node compass of competency is to the control node load information reporting.When a cell triggers mobility load balance, mobile load transfer request is sent to control node, control node is based on the request, the load information reported using all cells in compass of competency is that the cell determines optimal transfer path, and mobile load transfer command is sent to the cell on optimal transfer path, so that the cell on optimal transfer path carries out load transfer according to the optimal transfer path.Due to foundation of the control node using the current load situation alternatively optimal transfer path of all cells in compass of competency, considered so as to the mobile load transfer case of taking into account other cells, avoid Target cell to cause the situation of load excessive because receiving the load that transfer comes as far as possible.

Description

A kind of Mobile load balancing method and device

Technical field

The present invention relates to wireless communication field, more particularly to a kind of Mobile load balancing method and device.

Background technology

In wireless network communications system, with network UE (User ' s Equipment, user equipment) increase and Business load overload can occur for the increase in demand to business, the cell of some hot spot regions, and the load of neighbouring adjacent cell may be compared with Gently, for such case, cell can be solved by mobility load balance (Mobility Load Balancing, MLB) technology Between load imbalance problem.

MLB technologies are by certain mode, for example with mobility parameters self-optimizing or switching action, change business load Distribution, makes Radio Resource keep higher utilization ratio, while ensureing QoS (the Quality of of business set up Service, service quality).

Preferably mobility load balance is realized, one is how to select suitable Target cell the problem of important.Such as The selection of fruit Target cell is unreasonable, then can influence the effect of mobility load balance, results even in systematic function decline.

The content of the invention

The embodiments of the invention provide a kind of Mobile load balancing method and device, to select rational Target cell to enter Row mobility load balance.

The Mobile load balancing method that one embodiment of the present of invention is provided, including：

Control node receives the mobile load transfer request that the first community in the range of administration is sent, and the mobile load turns Move when the request first community judgement meets mobility load balance trigger condition and send, the mobile load transfer request The middle loading information to be transferred for carrying the first community；

The control node according to it is described it is mobile load transfer request, utilize that all cells in compass of competency report is negative Information carrying ceases, and is that the first community determines optimal transfer path；

The control node sends mobile load transfer command to the cell on the optimal transfer path, and the movement is born Carry and the information of the optimal transfer path carried in transfer command so that the cell on the optimal transfer path according to it is described most Excellent transfer path carries out load transfer；

Wherein, the load information that cell is reported includes load capacity, admissible maximum load transfer amount, the cell frequency of cell Spectrum efficiency；The load information that all cells in the utilization compass of competency are reported, is that the first community determines optimal transfer Path, is specifically included：

It is that each mobility load balance that meets is touched according to the load capacity of all cells in the control node compass of competency The cell of clockwork spring part determine on candidate's transfer path set, every candidate's transfer path include cell-of-origin and candidate target cells, The cell-of-origin is the cell for meeting mobility load balance trigger condition, and the candidate target cells include adjacent with cell-of-origin one The cell of jump or adjacent with cell-of-origin one cell for jumping to N jumps, N is integer more than 1；

According to the load capacity to be transferred of the cell-of-origin on every candidate's transfer path, the admissible maximum in candidate target cells The ratio between transfer amount, spectrum efficiency of two neighboring cell are loaded, is that the first community is shifted from the candidate of the first community Optimal transfer path is chosen in set of paths.

The Mobile load balancing method that another embodiment of the present invention is provided, including：

Cell in control node compass of competency is to the control node load information reporting, and the load information includes small The load capacity in area, admissible maximum load transfer amount, cell spectrum efficiency；

When the cell judgement in the control node compass of competency meets mobility load balance trigger condition, to the control Node processed sends the load capacity to be transferred letter that this cell is carried in mobile load transfer request, the mobile load transfer request Breath；

When the cell in the control node compass of competency receives the mobile load transfer life that the control node is sent After order, load transfer, the movement are carried out according to the mobile information for loading the optimal transfer path carried in transfer command It is that the control node is sent according to the mobile load transfer request received to load transfer command；Wherein, described optimal turn It is that the control node is determined by following steps to move path：

It is that each load capacity exceedes heavy duty door according to the load capacity of all cells in the control node compass of competency The cell of limit determines to include cell-of-origin and candidate target cells on candidate's transfer path set, every candidate's transfer path, described Cell-of-origin is the cell that load capacity exceedes heavy duty thresholding, and the candidate target cells include adjacent with cell-of-origin one cell jumped Or adjacent with cell-of-origin one cell for jumping to N jumps, N is integer more than 1；

According to the load capacity to be transferred of the cell-of-origin on every candidate's transfer path, the admissible maximum in candidate target cells Transfer amount, the ratio between spectrum efficiency of two neighboring cell are loaded, this is small from described to send the cell of mobile load transfer request Optimal transfer path is chosen in candidate's transfer path set in area.

Control node equipment provided in an embodiment of the present invention, including：

Receiving module, the mobile load transfer for receiving the transmission of the first community in this control node equipment compass of competency Request, the mobile load transfer request is that the first community judgement is sent when meeting mobility load balance trigger condition, The loading information to be transferred of the first community is carried in the mobile load transfer request；

Mobile load transfer decision-making module, for according to the mobile load transfer request, utilizing the institute in compass of competency There is the load information that cell is reported, be that the first community determines optimal transfer path；

Sending module, for sending mobile load transfer command, the movement to the cell on the optimal transfer path The information of the optimal transfer path is carried in load transfer command, so that the cell on the optimal transfer path is according to described Optimal transfer path carries out load transfer；

Wherein, the load information that cell is reported includes load capacity, admissible maximum load transfer amount, the cell frequency of cell Spectrum efficiency, the mobile load transfer decision-making module specifically for：

Base station provided in an embodiment of the present invention, including：

Statistics and reporting module, for the control node load information reporting to the cell for administering this base station, the load Information includes load capacity, admissible maximum load transfer amount, the cell spectrum efficiency of cell；

Mobile load transfer request module, for meeting mobility load balance trigger condition when the cell for adjudicating this base station When, sent to the control node in mobile load transfer request, the mobile load transfer request and carry treating for this cell Transferring load amount information；

Mobile load transfer performing module, for when the mobile load transfer command for receiving the control node transmission Afterwards, load transfer is carried out according to the mobile information for loading the optimal transfer path carried in transfer command, the movement is born It is that the control node is sent according to the mobile load transfer request received to carry transfer command；Wherein, the optimal transfer Path is that the control node is determined by following steps：

In the above embodiment of the present invention, the cell in control node compass of competency reports load to believe to the control node Breath.When a cell (such as first community) triggers mobility load balance, mobile load transfer request, control are sent to control node Node processed is based on the request, and the load information reported using all cells in compass of competency is that the first community determines optimal turn Path is moved, and mobile load transfer command is sent to the cell on the optimal transfer path, so that the optimal transfer path On cell carry out load transfer according to the optimal transfer path.Because control node utilizes all cells in compass of competency Current load situation alternatively optimal transfer path foundation, shift feelings so as to the mobile load that takes into account other cells Condition is considered, and avoids Target cell to cause the situation of load excessive because receiving the load that transfer comes as far as possible.

Further, the spectrum efficiency when selecting optimal transfer path also according to each cell, so that in view of difference The spectrum efficiency difference of cell so that the Target cell selected is more reasonable.

Another further aspect, due to for trigger mobility load balance cell determine candidate target cells when, will be with the cell In an adjacent and cell for skipping to N jumps is considered in, it is achieved thereby that multi-hop mobility load balance, expands the choosing of Target cell Select scope.

As can be seen here, several aspects or its combination more than so that more closed for the Target cell that cell-of-origin is selected Reason.

Brief description of the drawings

Technical scheme in order to illustrate the embodiments of the present invention more clearly, makes required in being described below to embodiment Accompanying drawing is briefly introduced, it should be apparent that, drawings in the following description are only some embodiments of the present invention, for this For the those of ordinary skill in field, without having to pay creative labor, it can also be obtained according to these accompanying drawings His accompanying drawing.

Fig. 1 is system architecture schematic diagram provided in an embodiment of the present invention；

Fig. 2 is the mobility load balance schematic flow sheet provided in an embodiment of the present invention realized in control node side；

Fig. 3 is the cell distribution map in the embodiment of the present invention；

Fig. 4 is the mobility load balance schematic flow sheet provided in an embodiment of the present invention realized in base station side；

Fig. 5 is the structural representation of control node equipment provided in an embodiment of the present invention；

Fig. 6 is the structural representation of base station provided in an embodiment of the present invention.

Embodiment

In order that the object, technical solutions and advantages of the present invention are clearer, below in conjunction with accompanying drawing the present invention is made into One step it is described in detail, it is clear that described embodiment is only embodiment of the invention a part of, rather than whole implementation Example.Based on the embodiment in the present invention, what those of ordinary skill in the art were obtained under the premise of creative work is not made All other embodiment, belongs to the scope of protection of the invention.

It is the applicable network architecture schematic diagram of the embodiment of the present invention referring to Fig. 1.Control node connects multiple base stations, the control Node processed can be the network equipment newly increased in existing network, can also be by being carried out to the equipment in existing network framework Improve to realize, such as, can be by the O＆M (operation and maintenance, Operation and Maintenance) in existing network Equipment or management station are improved to realize.In embodiments of the present invention, the control node is mainly used to mobility load balance Process is controlled and managed.The quantity for the cell that one control node is administered depends on the deployment strategy of operator, such as There can be hundreds of cells.

In order that control node can be controlled and manage to mobile load transfer process, the control node institute linker Stand the cell that the control node is administered in other words, the statistics for carrying out load information is simultaneously reported, and is moved as control node Load-balancing decision and the foundation of management.

In order to improve system flexibility, the base station of control node connection or the cell of administration, according to circumstances it can open or close Mobility load balance function is closed, only opening the base station of mobility load balance function or cell could trigger or participate in move load Balancing procedure.

Preferably, in order to reduce network resource overhead or improve flexibility, mobility load balance function is only opened Base station or cell just carry out the statistics of load information and reported.

Based on said system framework, mobility load balance scheme provided in an embodiment of the present invention is matched somebody with somebody by control node and base station Close and complete.

Embodiment one

It is the mobility load balance flow signal realized in control node side that the embodiment of the present invention one is provided referring to Fig. 2 Figure.When the cell judgement in control node compass of competency meets mobility load balance trigger condition, triggering is following mobile negative Carry transfer process.For convenience with it is clear, below with control node compass of competency first community judgement meet movement Described exemplified by load balancing trigger condition.As shown in Fig. 2 the flow may include following steps 21~23：

Step 21：Control node receives the mobile load transfer request that the first community in its compass of competency is sent.The shifting Dynamic load transfer request is that first community judgement is sent when meeting mobility load balance trigger condition, the mobile load transfer The loading information to be transferred of the first community is carried in request.

Preferably, " load capacity to be transferred " of first community is all or portion in candidate's transfer terminal set in the cell Divide the load capacity sum of terminal.

In step 21, cell decide whether to meet mobility load balance trigger condition implementation can use with it is existing Technology identical mode, such as, when the load capacity of some cell meets or exceeds heavy duty thresholding, the cell, which judges to meet, moves Dynamic load equilibrium trigger condition.The embodiment of the present invention is not limited to how to define mobility load balance trigger condition.

Step 22：Control node utilizes all cells in compass of competency according to the mobile load transfer request received The load information reported, is that the first community determines optimal transfer path.

In step 22, it is preferable that the load information that cell is reported may include that the load capacity of cell, admissible maximum are negative Carry transfer amount, cell spectrum efficiency.The definition of above-mentioned various load parameters and reporting schemes, the movement that will be realized in base station side It is described in detail in load balancing flow.

In step 22, the load information that control node is reported using all cells in its compass of competency, is described One cell determines that the process of optimal transfer path may include：

First, it is the mobile load of each satisfaction according to the load capacity of all cells in the control node compass of competency The cell (such as load capacity exceedes the cell of heavy duty thresholding) of balanced trigger condition determines candidate's transfer path set.One time Selecting includes at least one candidate's transfer path in transfer path set.Include cell-of-origin and candidate's mesh on every candidate's transfer path Mark cell, the cell-of-origin be meet mobility load balance trigger condition cell (such as load capacity exceed heavy duty thresholding Cell), the candidate target cells include adjacent with cell-of-origin one jump cell or adjacent with cell-of-origin one jump to N (N be more than 1 integer) jump cell, to realize multi-hop mobility load balance.Such as, using shown in Fig. 3 cell distribution and loading condition as , candidate's transfer path of cell 17 is：Cell 17->Cell 13->Cell 14->Cell 9, another time of cell 17 The transfer path is selected to be：Cell 17->Cell 0->Cell 14.

Then, it can be received according to the load capacity to be transferred of the cell-of-origin on every candidate's transfer path, candidate target cells Maximum load transfer amount, the ratio between the spectrum efficiency of two neighboring cell, be time of the first community from the first community Select and optimal transfer path is chosen in transfer path set.

Step 23：Control node sends mobile load transfer command, the shifting to the cell on the optimal transfer path The information of the optimal transfer path is carried in dynamic load transfer command, so that the cell on the optimal transfer path is according to institute State optimal transfer path and carry out load transfer.

In above-mentioned flow, in step 22, on candidate's transfer path the adjacent cell of each two exist it is overlapping covered, And there is terminal to be distributed in the less cell of the adjacent hop count in corresponding with transfer path cell-of-origin in the two adjacent cells The overlapping region, in addition, the load capacity of each candidate target cells on candidate's transfer path is below heavy duty thresholding.

Below by taking candidate's transfer path i as an example, illustrate in a kind of preferred implementation of the present invention, candidate's transfer path On the condition that need to meet of candidate target cells.Cell _ j is that any two is adjacent on candidate's transfer path i with cell _ j+1 Cell, j >=0.J represents the hop count to cell-of-origin, and it is the cell-of-origin on candidate's transfer path i that corresponding cell is represented during j=0. Cell _ j and cell _ j+1 meets following condition：

Condition A：

Cell _ j and cell _ j+1 exist it is overlapping covered, and it is described it is overlapping covered in cell _ j end is distributed with End；

Condition B：

As j=0, load capacity _ j>The load capacity of cell-of-origin on heavy duty thresholding, i.e. candidate's transfer path i exceedes weight Load-threshold, the load capacity of other candidate target cells is below heavy duty thresholding；

As j >=1, heavy duty thresholding-load capacity _ j ＞ isolation j, heavy duty thresholding-load capacity _ j+1 ＞ isolation Degree _ j+1, and, isolation _ j<Isolation _ j+1.Wherein, load capacity _ j is the current load capacity of cell _ j, and isolation _ j is to wait The cell-of-origin on transfer path i is selected to cell _ j predetermined threshold value；Load capacity _ j+1 is the current load capacity of cell _ j+1, every It is cell-of-origin on candidate's transfer path i to the default threshold values of cell _ j+1 from degree _ j+1.That is, isolation is with the increasing of hop count Plus and increase so that the cell on candidate's transfer path, with the increase of hop count, its load capacity declines.

Such as, by taking the cell distribution shown in Fig. 3 and loading condition as an example, candidate's transfer path of cell 17 is：It is small Area 17->Cell 13->Cell 14->Cell 9, wherein, there is overlapping covered, the overlapping coverage areas in cell 13 and cell 14 It is distributed with the terminal of cell 13 in domain, the load capacity of cell 13 and cell 14 is below heavy duty thresholding, and the load of cell 14 Load capacity of the amount less than cell 13.

Include up mobility load balance, descending mobility load balance and up-downgoing movement in view of mobility load balance negative Carry balanced, thus it is different in the type of the mobility load balance triggered according to cell-of-origin, determining that candidate turns using above-mentioned condition Move also different during path.Such as, if cell-of-origin triggering is negative in up mobility load balance, above-mentioned condition B Carrying capacity relevant parameter (including the current load capacity of heavy duty thresholding, cell, isolation) is ascending load amount relevant parameter；If Cell-of-origin triggering is descending mobility load balance, then load capacity relevant parameter in above-mentioned condition B (including heavy duty thresholding, The current load capacity of cell, isolation) it is down load amount relevant parameter；If cell-of-origin triggering is up-downgoing movement load Equilibrium, then meeting above-mentioned condition B in the upstream direction, (the load capacity relevant parameter used in such cases is ascending load amount Relevant parameter), above-mentioned condition B is also met in the downstream direction, and (the load capacity relevant parameter used in such cases is descending Load capacity relevant parameter).

For example, if cell-of-origin triggering is up mobility load balance, control node judgement and the cell-of-origin Whether the load for the cell that adjacent k (k >=1) is jumped meets following condition：

TH_{High_UL}-R_{N_UL_C}＞ Δ L ... ... ... ... formula 1

Wherein, TH_{High_UL}For up heavy duty thresholding, R_{N_UL_C}For the current ascending load amount of current cell to be determined, take It is (0,1) to be worth scope；Δ L is isolation of the cell-of-origin to current cell to be determined, and span is (0,1), with hop count Increase, isolation value gradually increases.

If meeting, using currently k-hop candidate target of the cell to be determined as the up mobility load balance of the cell-of-origin Cell.

If cell-of-origin triggering is descending mobility load balance, control node adjudicates the negative of the adjacent cell of the cell-of-origin Whether load meets following condition：

TH_{High_DL}-R_{N_DL_C}＞ Δ L ... ... ... ... formula 2

Wherein, TH_{High_DL}For descending heavy duty thresholding, R_{N_DL_C}For the current down load amount of current cell to be determined, take It is (0,1) to be worth scope；Δ L is isolation of the cell-of-origin to current cell to be determined, and span is (0,1), with hop count Increase, isolation value gradually increases.

If meeting, using currently k-hop candidate target of the cell to be determined as the descending mobility load balance of the cell-of-origin Cell.

If cell-of-origin triggering is up-downgoing mobility load balance (i.e. up-downgoing moves load balancing), control Node processed is by the condition both met shown in formula 1 or meets the k-hop cell of the condition shown in formula 2, is used as the upper of the cell-of-origin The k-hop candidate target cells of descending mobility load balance.

Further, then can be to this for k-hop adjacent with cell-of-origin but the unselected cell for candidate target cells A little cells send resource status request message, to ask these cells to stop reporting load capacity relevant parameter.Such as PRB (physical resource block, Physical Resource Block) resource utilization or the correlation for calculating PRB resource utilizations Parameter, can so reduce the hardware spending of these cell cycle status reports.

The position distribution situation of terminal in cell, and minizone is with the presence or absence of overlapping covered, can be by terminal The measurement report of report is obtained.

Such as, ICIC (Inter-Cell Interference Coordination, Inter-Cell Interference Coordination) is being opened In the case of, base station can configure these terminals and carry out location-based A3 measurements and report, the measurement result reported according to terminal Distinguish central user and edge customer.

For another example, base station configures special measurement configuration, the special measurement for connected state terminal all in cell-of-origin Using specific measurement ID to be distinguished with the common measurement for being used to switch, the special measurement is used for realizing user position Put positioning.The special measurement is configured to RSRP (the Reference Singal Received that instruction terminal measures adjacent cell Power, the receiving power of reference signal) and report one or more adjacent cell signal intensity measurement result.The measurement , such as common switching lower than the triggering thresholding of the common measurement configuration for being used to switch with the report triggering thresholding centered For 3dB, then the measurement is configured to -2dB.Base station distinguished according to measurement ID the common measurement report for being used to switch or Measurement report for judging terminal orientation.The measurement of the signal intensity of one or more adjacent cell can be included in measurement report As a result, if terminal has reported multiple adjacent cells, this terminal is all write into the overlapping covered of these adjacent cells respectively Terminal list in, can so obtain each cell has overlapping covering with which adjacent cell, and overlapping with these adjacent cells There is which terminal in overlay area respectively.

Certainly, base station can also obtain the position distribution situation of terminal by other means, and the overlapping of minizone is covered Cover area distribution situation.

In above-mentioned flow, in step 22, it is preferable that control node can according to the load capacity to be transferred of each cell-of-origin, Each admissible maximum load transfer amount in candidate target cells, transfer factor, using optimal resolving Algorithm be each cell-of-origin from Optimal transfer path is chosen in the set of corresponding candidate transfer path.

Optimal resolving Algorithm from be possible to scheme commonly used to choose optimal case, and general every kind of scheme correspondence one is commented It is worth (or cost value).The evaluation of estimate is used for representing distance of the corresponding scheme apart from optimal case, and optimal resolving Algorithm passes through meter The evaluation of estimate for calculating every kind of scheme eventually finds optimal case.

The target of optimal resolving Algorithm used in the embodiment of the present invention be allow all cells load desired value and side The indexs such as difference are minimum, i.e. the load of all cells is in a basic balance, it is to avoid load situation about being shifted to same Target cell.Institute The optimal resolving Algorithm used can be greedy algorithm or genetic algorithm etc., will not enumerate herein.

In order that the optimal transfer path selected is more reasonable, the systematic function after mobility load balance is set to carry In height, the embodiment of the present invention during using the optimal transfer path of optimal solution algorithm picks, transfer factor is introduced.This turn The shifting factor take into account the ratio between spectrum efficiency of two neighboring cell on candidate's transfer path, such as, if defining the ratio Algorithm is：The spectrum efficiency divided by k-1 of k-hop cell jump the frequency efficiency of cell, then for the different candidates of same cell-of-origin The cell of same number of hops on transfer path, such as 2 jump cell, wherein 2 jump cells and the 1 spectrum efficiency ratio for jumping cell are high Candidate's transfer path, the probability for being chosen for optimal transfer path is higher.Further it is also possible to consider terminal cell-of-origin whether Signal is most strong etc..That is, using the factors such as the spectrum efficiency of cell-of-origin and candidate target cells as choose optimal transfer path according to One of according to, so as in view of the difference of each candidate target cells, make the optimal transfer path or Target cell more adduction selected Reason, is improved the systematic function after mobility load balance.

The mobility load balance flow of base station side execution is described below.

Base station or cell in control node compass of competency are to the control node load information reporting, the load information It may include the load capacity, admissible maximum load transfer amount, cell spectrum efficiency of cell.Preferably, base station or cell can be pressed Load information statistics is carried out according to the setting cycle and is reported, and also load information can be carried out when predefined event is triggered reports, than Reported as load capacity carries out load information when changing greatly.

The load capacity of cell or base station statistics and the cell reported can have a variety of characteristic manners, such as using TNL (transmission networks Network layers) utilization rate or hardware load parameter (such as CPU usage) etc., it can also pass through the weighting to polytype load parameter With characterize." PRB resource utilizations " is preferably used in the embodiment of the present invention to characterize the load capacity of cell, PRB resources profit It may include up PRB resource utilizations and/or descending PRB resource utilizations with rate.It can be entered according to up PRB resource utilizations The up mobility load balance of row；Descending mobility load balance can be carried out according to descending PRB resource utilizations；According to up PRB Resource utilization and descending PRB resource utilizations can carry out up-downgoing mobility load balance.Up PRB resource utilizations are with The load parameter that row PRB resource utilizations can be obtained by Cell statistical is calculated and obtained.

Correspondingly, in system the cell load reporting parameters that each base station or cell can obtain itself statistics are to control Node；The cell load parameter that can also be obtained according to itself statistics, which is calculated, obtains PRB resource utilizations, by the PRB calculated Resource utilization reports control node.The PRB resource utilizations of itself are calculated by each base station or cell, on the one hand can be saved Network resource overhead, on the other hand can save the computing overhead of control node.Preferably, base station or cell can be according to setting weeks Phase carries out cell load parametric statistics and reported.

Can have a variety of according to the specific implementation that cell load parameter calculates PRB resource utilizations, be given below one Plant preferred implementation.

By taking cell i as an example, in the chronomere (such as frame), the up PRB resource utilizations of cell i can according to Lower formula (3) calculates and obtained：

... ... formula 3

Wherein, the various cell load parameter declarations in formula (3) are as follows：

Num_{PRB_u}All average each chronomere's (example has been carried in a load statistics cycle for cell i is up Such as frame) the interior PRB quantity taken；Num_{PRB_u}It can be acquired from the scheduler module of the base station of cell i；

R_{SBR_u}All active service speed total in a load statistics cycle has been carried on for cell i is up；R_{SBR_u} It can be acquired from the scheduler module of the base station of cell i；

M_uFor when reaching in the load statistics cycle, cell i is up also existing and has the quantity of the carrying of rate requirement；

For m in cell i_uThe upstream request bearer rate of individual up carrying and up actual bearer speed take smaller Value, upstream request bearer rate requirement is GBR (Prioritized Bit Rate, Maximum Bit Rate) speed or PBR (Guaranteed Bit Rate, it is ensured that bit rate) speed, up actual bearer speed is MAC (Media Access Control, media access control) the up actual schedule of layer speed,Unit and R_{SBR_u}Unit be consistent； It is the parameter of base station configuration；

N_{PRB_u}Total PRB quantity under uplink bandwidth for each chronomere (such as frame) interior cell i；

UE_{sinr_ul}For PUSCH (the Physical Uplink Shared Channel, physical uplink of each UE in cell i Shared channel) SINR (Signal to Interference plus Noise Ratio, Signal to Interference plus Noise Ratio, i.e., Signal to Interference plus Noise Ratio), SINR_{max_ul}For the whole network UE PUSCH SINR maximum；UE_{sinr_ul}The CQI that can be reported from UE to base station (Sounding Reference Signal are visited by (Channel Quality Indicator, CQI) and SRS Survey reference signal) acquire in feedback information.

By taking cell i as an example, in the chronomere (such as frame), the descending PRB resource utilizations of cell i can according to Lower formula (4) calculates and obtained：

... ... formula 4

Wherein, the various cell load parameter declarations in formula (4) are as follows：

Num_{PRB_d}All average each chronomere's (example has been carried in a load statistics cycle for cell i is descending Such as frame) the interior PRB quantity taken；Num_{PRB_d}It can be acquired from the scheduler module of the base station of cell i；

R_{SBR_d}All active service speed total in a load statistics cycle has been carried on for cell i is descending；R_{SBR_d} It can be acquired from the scheduler module of the base station of cell i；

M_dFor when reaching in the load statistics cycle, the quantity of the carrying that is descending also existing and having rate requirement of cell i；

For the m of cell i_dThe downbound request bearer rate of individual downlink bearing and descending actual bearer speed take smaller Value, the requirement of downbound request bearer rate is GBR speed or MinBR (minimal bit rate) speed, and descending actual bearer speed is The speed of MAC (Media Access Control, media access control) descending actual schedule of layer,Unit and R_{SBR_d}'s Unit is consistent；It is the parameter of base station configuration；

N_{PRB_d}Total PRB quantity under downstream transmission bandwidth for each chronomere (such as frame) interior cell i；

UE_{sinr_dl}For the PDSCH (under Physical Downlink Shared Channel, physics of each UE in cell i Row shared channel) SINR, SINR_{max_dl}For the whole network UE PDSCH SINR maximum；UE_{sinr_dl}On can be from UE to base station Acquired in CQI the and SRS feedback informations of report.

Preferably, by taking cell i as an example, the admissible maximum load transfer amount of cell i can be calculated according to below equation Arrive：

Max_MobilityLoad_i=Thrd-Load_i ... ... ... ... formula 5

Wherein, max_MobilityLoad_i is the admissible maximum load transfer amount of cell i；Thrd is the weight of cell i Load-threshold value, mobility load balance process can be triggered if the load of cell exceedes the threshold value；Load_i is the reality of cell i Border load capacity.

Preferably, it is contemplated that cell load amount is real-time change, come in order to avoid Target cell receives cell-of-origin transfer Load capacity after, due to original terminal in the Target cell load capacity change cause Target cell load exceed heavy duty Thresholding, therefore the admissible maximum load transfer amount of cell can be obtained according to below equation calculating：

Max_MobilityLoad_i=(Thrd-Load_i) * λ ... ... ... formula 6

Wherein, 0 ＜ λ ＜ 1, it is preferable that λ desirable 95% or so.

It is the mobility load balance schematic flow sheet for the base station side that the embodiment of the present invention one is provided referring to Fig. 4.As schemed Show, when the cell judgement in the control node compass of competency meets mobility load balance trigger condition, perform following steps 41~42：

Step 41：The cell that judgement meets mobility load balance trigger condition please to the mobile load transfer of control node transmission Ask, the loading information to be transferred of this cell is carried in the mobile load transfer request；

Step 42：The cell is received after the mobile load transfer command that the control node is sent, according to the movement The information of the optimal transfer path carried in load transfer command carries out load transfer, and the mobile load transfer command is described Control node is sent according to the mobile load transfer request received.Wherein, control node is according to the mobile load received Transfer command carries out the process (transmission for including selection and the mobile load transfer command of optimal transfer path) of relevant treatment, It is the same as those described above, will not be repeated here.

In step 42, the mobile load transfer command that control node is sent is sent to its optimal transfer determined Cell on path, these cells include the cell (i.e. cell-of-origin) that load transfer request is moved in above-mentioned transmission, in addition to the source The one of cell jumps or multi-hop Target cell.These Target cells are received after mobile load transfer command, also can be according to the order Load transfer is moved, so that the load capacity of cell-of-origin is transferred into optimal objective cell along optimal transfer path.

In step 42, in order to which the load capacity by the mobile cell (i.e. cell-of-origin) for loading transfer request is sent is along optimal turn Move path and be transferred to optimal objective cell, can realize in the following way：Handoff parameter is adjusted, so that terminal is switched to mesh as early as possible Mark cell；Or switch the terminal into Target cell.To realizing that the mode of load capacity transfer is not limited in the embodiment of the present invention. Such as, if first community have sent mobile load transfer request, on the corresponding optimal transfer path of first community, first Overlapping covered interior terminal between cell and a jump Target cell is switched to the jump Target cell, and (terminal is being cut Belong to first community before changing), the overlapping covered interior terminal between a jump Target cell and two jump Target cells is switched Target cell (terminal belongs to a jump Target cell before the handover) is jumped to two, by that analogy.

In step 41, the load capacity to be transferred of a cell be all in candidate's transfer terminal set of the cell or The load capacity sum of part terminal.

Candidate's transfer terminal set includes at least one candidate transfer terminal.For a cell, the cell has It is likely to be on different transfer paths, then candidate's transfer terminal set on every transfer path is incomplete same.To turn Move exemplified by the i of path, for cell _ j on transfer path i, cell _ j candidate's transfer terminal set meets following condition：It is located at Cell _ j edge, and it is overlapping covered interior in cell _ j and cell _ j+1.Wherein, cell _ j and cell _ j+1 is to turn Move the upper two adjacent cells of path i；J represents the hop count to cell-of-origin, 0≤j≤N-1, and N is candidate's transfer path i cell Total hop count, it is the cell-of-origin on candidate's transfer path i that corresponding cell is represented during j=0.

The direction of the mobility load balance triggered according to cell-of-origin, the load capacity of candidate's transfer terminal includes ascending load amount With down load amount.Wherein, if up mobility load balance is triggered in cell-of-origin, need to calculate the up of candidate's transfer terminal Load capacity；If descending mobility load balance is triggered in cell-of-origin, need to calculate the down load amount that candidate shifts terminal；If Up-downgoing mobility load balance is triggered in cell-of-origin, then needs to calculate ascending load amount and down load amount that candidate shifts terminal.

Preferably, by taking candidate's transfer terminal i as an example, its up load capacity can be calculated according to below equation and obtained：

... ... ... formula 7

Wherein, R_{S_C_ul_i}The ascending load transfer amount of terminal i is shifted for candidate；Num_{PRB_ul_i}Terminal i is shifted for candidate Up be carried in a load statistics cycle takes total PRB quantity in average each chronomere；R_{SBR_ul_i}Candidate That shifts terminal i has been carried on active service speed total in a load statistics cycle to be up；Turn for candidate The upstream request bearer rate and up actual bearer speed for moving the up carrying of terminal i take smaller value；N_{PRB_ul}It is single for each time PRB quantity total under uplink bandwidth in position；UE_{sinr_ul_i}The PUSCH of terminal i SINR, SINR is shifted for candidate_{max_ul}For The PUSCH SINR of the whole network user are in its up maximum.

Preferably, by taking candidate's transfer terminal i as an example, its down load amount can be calculated according to below equation and obtained：

... ... ... ... formula 8

Wherein, R_{S_C_dl_i}The down load transfer amount of terminal i is shifted for candidate；Num_{PRB_d}It is descending for candidate's transfer terminal i It has been carried in a load statistics cycle and has taken total PRB quantity in average each chronomere；R_{SBR_dl_i}Turn for candidate Move that terminal i is descending has been carried on active service speed total in a load statistics cycle；Terminal i is shifted for candidate The downbound request bearer rate of downlink bearing and descending actual bearer speed take smaller value；N_{PRB_dl}Under in each chronomere Total PRB quantity under row transmission bandwidth；UE_{sinr_dl_i}The PDSCH of terminal i SINR, SINR is shifted for candidate_{max_dl}Used for the whole network The SINR at family is in its descending maximum.

Usual cell-of-origin or base station will also monitor the load capacity of cell-of-origin, work as cell-of-origin during mobility load balance Load capacity when dropping to given threshold (such as heavy duty recovery thresholding) below, terminate the movement from the cell-of-origin to Target cell Load balancing process.

Description to embodiment one more than can be seen that, on the one hand, because the load capacity for obtaining multi-hop adjacent cell is made To choose the foundation of Target cell, the scope of Target cell selection is expanded, multi-hop MLB, the expansion of Target cell scope can be achieved Greatly, the Target cell chosen can be caused more towards reasonable；On the other hand, the optimal transfer path of optimal solution algorithm picks is being used When, it is contemplated that each admissible maximum transfer load capacity in candidate target cells so that avoid as far as possible the load of Target cell because Receive cell-of-origin transfer come load and it is excessive, cause system deterioration；Another further aspect, is using optimal turn of optimal solution algorithm picks Move path when, by the factors such as the spectrum efficiency of cell alternatively according to one of, so as to take into account the difference of minizone so that The optimal objective cell of selection is tended to rationally.

Embodiment two

,, can be based on candidate's transfer when moving load transfer in cell or base station side on the basis of embodiment one The transfer priority of terminal moves load transfer.The transfer priority of candidate's transfer terminal can be counted by base station or cell Calculate, also the system performance information that candidate shifts terminal can be reported into control node by base station or cell, by control node according to The system performance information of candidate's transfer terminal calculates candidate and shifts the transfer priority of terminal, and can be carried on mobile load transfer Order is sent to base station or cell.

Preferably as a kind of implementation, it is negative that the cell in control node side, control node compass of competency is reported It may include that candidate's transfer terminal set and candidate shift the system performance information of terminal in information carrying breath.Control node determines time Select after transfer path set, for every path candidate, according to other on candidate's transfer path in addition to final jump cell The candidate's transfer terminal set carried in the load information that cell is reported and candidate shift the system performance information of terminal, it is determined that Candidate shifts the transfer priority of terminal, and is carried in the mobile load transfer command of transmission on the optimal transfer path Cell candidate transfer terminal set and candidate shift terminal priority so that the cell on the optimal transfer path The order of the transfer priority of terminal from high to low, which is shifted, according to candidate chooses candidate's transfer terminal progress load transfer.

Wherein, candidate's transfer terminal set includes at least one candidate transfer terminal.By taking candidate's transfer path i as an example, For cell _ j, cell _ j candidate's transfer terminal set meets following condition：Positioned at cell _ j edge, and in cell _ j With cell _ j+1 it is overlapping covered in.Wherein, cell _ j and cell _ j+1 is two adjacent cells；J represents small to source The hop count in area, 0≤j≤N-1, N is the candidate's transfer path i total hop count of cell, represents that corresponding cell turns for candidate during j=0 The cell-of-origin moved on the i of path.

In embodiment two, according to the order of transfer priority from low to high, correspondence candidate shifts the systematic function of terminal Gradually reduce, i.e. transfer priority is higher, and corresponding systematic function is lower.

The transfer priority of candidate's transfer terminal is used to represent preferential journey when candidate transfer terminal carries out load transfer Degree.Usually, the transfer priority of candidate's transfer terminal is higher, and the load capacity of candidate transfer terminal is more preferentially shifted To Target cell.

The definition of priority is shifted based on more than, the embodiment of the present invention gives a kind of transfer for determining candidate's transfer terminal The preferred calculation formula of priority.

First, calculating priority factors are carried out according to below equation：

... formula 9

Wherein, γ_iRepresent that candidate shifts the priority factors of terminal i；α、β、, θ span be [0,1]； RSRP_iRepresent that candidate shifts the RSRP of terminal i；SINR_{ul_i}、SINR_{dl_i}Represent that candidate shifts the PUSCH SINR of terminal i respectively With PDSCH SINR；Service_{ul_i}、Service_{dl_i}Represent that candidate shifts up, the downlink user speed of terminal i respectively；P_ shedule_{ul_i}、P_shedule_{dl_i}Represent that candidate shifts up, the descending scheduling probability of terminal i respectively；RSRP_max,iRepresent system Maximum in system in the RSRP of all terminals；SINR_{ul_max,i}、SINR_{dl_maxi,}All terminals in expression system respectively The maximum in maximum and PDSCH SINR in PUSCH SINR；Service_{ul_max,i}、Service_{dl_max,i}Represent respectively The maximum in maximum and downlink user speed in system in the uplink user speed of all terminals；P_ shedule_{ul_max,i}、P_shedule_{dl_max,i}Respectively the maximum in expression system in the uplink scheduling probability of all terminals and Maximum in descending scheduling probability；Floor () represents to round downwards.

Then, priority factors are mapped as corresponding transfer priority.Priority factors γ_iValue is smaller, then corresponding Shift priority higher, i.e. according to the order of priority factors from small to large, correspondence transfer priority is gradually stepped up.Such as, may be used To priority factors γ_iRounded after inverted, regard the result after rounding as the value for shifting priority, it would however also be possible to employ other Mapping method, by priority factors γ_iIt is mapped as the value of corresponding transfer priority.

Correspondingly, in cell or base station side, shift the order of the transfer priority of terminal from high to low according to candidate and choose Candidate's transfer terminal carries out load transfer.Specifically, the transfer priority of terminal is shifted from high to low in cell-of-origin according to candidate Order, by optimal transfer path candidate shift terminal load to one jump Target cell transfer, one jump Target cell presses The order of the transfer priority of terminal from high to low is shifted according to candidate, the candidate on optimal transfer path is shifted to the load of terminal Target cells transfer is jumped to two, by that analogy, until the load reduction of the cell-of-origin is to below heavy duty thresholding, or until expiring Foot others mobility load balance termination condition.

Preferably, in cell or base station side, in order to prevent mobility load balance from bringing the shadow of deterioration to systematic function as far as possible Ring, according to the candidate of cell shift terminal load capacity determine the load capacity to be transferred of the cell during, can according to turn Move priority order from high to low the terminal in terminal set shifted to candidate and be ranked up, and out of set after sequence from The individual candidate's transfer terminals of K (K >=1) before front to back is chosen, and the load capacity sum of K candidate's transfer terminal is calculated, so as to obtain To the load capacity to be converted of cell.

Preferably, K is M times of candidate target cells quantity, M span preferably may be configured as (0,5].M values Bigger, the quantity for carrying out the terminal of load transfer is more, and the influence to systematic function is bigger, because interference exacerbation may be brought System deterioration；Conversely, M values are smaller, the quantity for carrying out the terminal of load transfer is fewer, systematic function smaller to systematic influence Lifting is not obvious.

By the description to embodiment two as can be seen that due to the high terminal of transfer priority, its system in cell-of-origin Poor-performing, with greater need for adjacent cell is transferred to improve systematic function, therefore the preferential candidate that systematic function is poor shifts eventually The load at end is shifted to Target cell, on the one hand can improve the systematic function of these terminals, is on the other hand also contributed to whole The raising of the handling capacity of system.

Embodiment three

On the basis of embodiment one or embodiment two, embodiment three provides a kind of cell-of-origin pair of mobility load balance In the call access control scheme of terminal.

In cell in view of triggering mobility load balance, have terminal request and access the cell, or have terminal State changes, such as terminal is converted to normal mode from offline mode, or has the terminal request of adjacent cell and be switched to Situations such as cell, occurs, in embodiment three, and position that can be according to where terminal decides whether to access terminal.

The admission control scheme that embodiment three is provided may include：

Strategy one：If the cell of triggering mobility load balance receives the access request of terminal, the cell judges should Whether terminal is located at the central area of the cell, if then receiving the access request of the terminal, so that it is small that the terminal is accessed into this Area, otherwise refuses the access request of the terminal.Wherein, normal mode is converted to when accessing terminal to network or from offline mode When, it can initiate access request.

Strategy two：If the cell of triggering mobility load balance receives the handover request of its adjacent cell transmission, this is small Area judges whether the terminal that will switch is located at the center of the cell, if then receiving the handover request, so that should Terminal accesses the cell, and that otherwise refuses the terminal is switched to the cell.

The Access Control Policy provided by embodiment three, sends for the terminal in heavy duty center of housing estate region Network insertion is asked, and the heavy duty cell can be accessed, to improve the satisfaction of user；Or, for being moved into The terminal in heavy burden center of housing estate region, receives the handover request of the terminal, can normally be entered with the communication service for ensureing the terminal OK, the network insertion sent is refused for the terminal in heavy duty cell edge region, so as to be linked into heavy duty cell Neighbouring relatively light load cell, is also equivalent to perform a load transfer, so also improves the handling capacity of system.

Example IV

In order to as far as possible avoid because of the deleterious effects that mobility load balance is brought to systematic function, it is preferable that embodiment one, On the basis of embodiment two or embodiment three, example IV additionally provides following prioritization scheme：

Cell or base station the statistical system performance during mobility load balance, and when the systematic function obtained according to statistics When index decision system hydraulic performance decline is to below given threshold, terminate the mobility load balance process currently carried out, and according to most Excellent transfer path carries out parameters back, and the optimal transfer path is the path for occurring load transfer.The parameters back refers to, The parameter changed by the mobility load balance process is recovered, i.e. to changing number because mobility load balance needs The parameter of value, before restoring it change.

As a kind of preferred implementation, in cell or base station side, cell or base station are united during mobility load balance Meter systems performance, when below the system performance index decision system hydraulic performance decline obtained according to statistics to setting thresholding, to control Node processed sends mobile load transfer and terminates request；In control node side, control node receives mobile load transfer termination please After asking, request is terminated according to movement load transfer and determines corresponding transfer path, request institute is terminated to movement load transfer Cell on corresponding transfer path sends mobile load transfer and terminates order；Base station is received after cell or base station side, cell Terminated to mobile load transfer after order, terminate the mobile load transfer process currently carried out and carry out parameters back.

Preferably, the system performance index that cell or base station are counted may include following KPI (Key Performance Indicator, Key Performance Indicator) one or more in index：Cutting off rate, Radio Link Failure rate, handover failure rate, connect Receive success rate etc., due to performance indications caused by load, such as：RRC (Radio Resource Control, wireless heterogeneous networks) Connection sets up mortality, E-RAB (evoled-Radio Access Bearer, enhanced wireless access bearer) connections and sets up mistake Abnormal release rate of rate, RRC Connection Releases rate, E-RAB etc. is lost, cell-of-origin (the i.e. triggering movement on transfer path can also be included The cell of load balancing process) load.Cell-of-origin load rise in the case of, show cell-of-origin penalty, it is necessary to Terminate mobility load balance.

Accordingly, according to the result of above-mentioned statistics, cell or base station can be proceeded as follows：

(1) mobility load balance currently performed is proceeded if KPI indexs substantially do not deteriorate；

(2) if KPI indexs deteriorate serious (such as handover failure rate is too high) or load capacity has already decreased to setting thresholding (such as heavy duty recovery thresholding), then send mobile load transfer to control node and terminate request.

Preferably, the system performance index that cell or base station are counted include too late switching probability, too early switching probability, Mistake switching probability etc..In the case of statistics too late switching probability, too early switching probability, mistake switching probability, joined When number retracts, by taking cell _ j cells adjacent for any two on optimal transfer path with cell _ j+1 as an example, it may include following Situation：

Situation one：If cell _ j determines to be switched too late according to statistical result, show from cell _ j to cell _ j+ The condition of 1 switching is higher, therefore (Cell Individual Offset, cell is personalized by cell _ j to cell _ j+1 CIO Skew) up-regulation, and the span of the CIO is updated, make lower limit the taking more than CIO when occurring to switch too late of the span Value, CIO values when making subsequently to adjust the CIO after adjustment are not less than the lower limit, so as to avoid after the follow-up adjustment to the CIO Situation about switching too late occurs again.

Such as, in the case that cell _ j to cell _ j+1 CIO span is [- 2,5], the CIO=0, according to system Meter result determines to be switched too late, then CIO=0+step will be adjusted in the value of the CIO, and (step compensates for adjustment, is just Value), and the span of the CIO is adjusted to (0,5], do not include 0 in the span.

Situation two：If cell _ j determines to there occurs too early switching according to statistical result, show from cell _ j to cell _ j+ The condition of 1 switching is less than normal, therefore cell _ j to cell _ j+1 CIO is lowered, and updates the span of the CIO, takes this It is worth the value that the higher limit in scope is less than CIO when occurring switching too early, CIO when making subsequently to adjust the CIO after adjustment Value is not above the higher limit, so as to avoid that situation about switching too early occurs again after subsequently being adjusted to the CIO.

Such as, in the case that cell _ j to cell _ j+1 CIO span is [- 2,5], the CIO=0, according to system Meter result determination there occurs too early switching, then CIO=0-step will be adjusted under the value of the CIO, and (step compensates for adjustment, is just Value), and the span of the CIO is adjusted to [- 2,0), do not include 0 in the span.

Situation three：If cell _ j determines to there occurs handoff error according to statistical result, by cell _ j to cell _ j+1 CIO lower, and notifying cell _ j+1 is by cell _ j+1 to cell _ j CIO downward, and updates the span of the CIO, makes Higher limit in the span is less than the value of CIO when making a mistake switching, so as to avoid after the follow-up adjustment to the CIO Make a mistake the situation of switching again.

Such as, cell _ j to cell _ j+1 CIO1 and cell _ j+1 to cell _ j CIO2 span be [- 2,5], in the case of CIO1=0, the CIO2=1, determined to there occurs wrong switching according to statistical result, then by CIO1 value Under be adjusted to CIO=0-step (step compensates for adjustment, be on the occasion of), will be adjusted to CIO2=1-step under CIO2 value, and will CIO1 span be adjusted to [- 2,0), 0 is not included in the span, CIO2 span is adjusted to [- 2,1), Do not include 1 in the span.

Pass through the above-mentioned operation that CIO is adjusted according to different situations, it is ensured that avoid the MLB of minizone to continue to produce as far as possible The deterioration of " ping-pong ".

Further, can also get parms the indexs such as the history handover failure rate before retracting, if before parameters back The performance indications such as history handover failure rate occur in that unacceptable degree, such as, history handover failure rate is higher than threshold value, then The mobility load balance function of this cell is closed, is further deteriorated to prevent locking system performance.Preferably, can get parms rollback History handover failure rate in preceding nearly a period of time simultaneously judges whether to need to close mobility load balance function accordingly.

Such as, if history handover failure rates from cell A to cell B of the cell A before parameters back is higher than setting threshold Value, then cell A closes the mobility load balance function of this cell.Generally in this case, cell B can be also counted in parameter The history handover failure rate from cell A to cell B before rollback is higher than given threshold, therefore cell B can also close this cell Mobility load balance function.The threshold value can based on experience value be determined or determined according to system requirements, it is preferable that the threshold can be set The value of value was 0~3% (not including 0).

It can be seen that by the above-mentioned description to example IV and system KPI indicator-specific statistics carried out by the cycle, and in basis When statistical result finds system performance degradation, corresponding measure can be taken in time to avoid the further deterioration of systematic function.

In order to be more clearly understood that the embodiment of the present invention, with reference to being illustrated exemplified by the cell distribution map shown in Fig. 3. Each hexagon in figure represents the small of the digitized representation cell that has under a cell, a base station in 3 cells, hexagon Area ID.The Fill Color of each hexagon represents the load size of respective cell, is successively from small to large according to load capacity：In vain The cell (light loaded cell) of color filling, the cell (medium load cell) of light grey filling, the cell (heavy burden of Dark grey filling Carry cell).The direction that the direction of arrow shifts for load.

All it is heavy duty cell around cell 20 (i.e. cell ID=20), if the heavy duty cell around cell 20 is all To the transferring load of cell 20, then the load of cell 20 can be increased to medium load cell even heavy duty cell, cause table tennis Switching.If using the scheme of the embodiment of the present invention, take and candidate target cells are estimated with admissible maximum transfer amount, and root Load transfer is carried out according to the transfer priority of terminal, the generation of this problem will be reduced.

There is no light loaded cell in a cell jumped around cell 17, two can be carried out using the scheme of the embodiment of the present invention Jump above MLB and transfer load to cell 13, cell 14 is transferred to by cell 13, then cell 9 is transferred to by cell 14.

If the load of cell 37 and cell 1 is all shifted to cell 14, the load accumulation of cell 14 may result in.If adopted Scheme provided in an embodiment of the present invention is used, then the load of cell 37 can be transferred to cell 36, cell 17 is transferred load to Cell 14, then cell 9 is transferred to by cell 14, the load of cell 1 is transferred to cell 6.If carrying out load by double bounce MLB to turn Shifting can not still meet requirement, then the MLB of more multi-hop can be taken to load transfer.

If cell 39 and cell 44 all to the transferring load of cell 40, can equally cause the load of cell 40 to accumulate.Adopt Scheme provided in an embodiment of the present invention is used, optimal transfer path is chosen by way of seeking optimal solution, can be by the load of cell 44 Cell 40 is transferred to, and the load of cell 39 is transferred to cell 41.

In summary, in the above embodiment of the present invention, cell in control node compass of competency is in the control node Report load information.When a cell (such as first community) triggers mobility load balance, send mobile load to control node and turn Request is moved, control node is based on the request, the load information reported using all cells in compass of competency is the first community Determine optimal transfer path, and mobile load transfer command sent to the cell on the optimal transfer path so that it is described most Cell on excellent transfer path carries out load transfer according to the optimal transfer path.Because control node is using in compass of competency All cells current load situation alternatively optimal transfer path foundation, so as to take into account the movement of other cells Load transfer case is considered, and avoids Target cell to cause the feelings of load excessive because receiving the load that transfer comes as far as possible Condition.

Based on identical technical concept, the embodiment of the present invention additionally provides a kind of control node equipment and base station.

It is the structural representation of control node equipment provided in an embodiment of the present invention referring to Fig. 5.As illustrated, the control Node device may include：Receiving module 51, mobile load transfer decision-making module 52, sending module 53, wherein：

Receiving module 51 is used to receive the mobile load turn that the first community in this control node equipment compass of competency is sent Request is moved, the mobile load transfer request is that the first community judgement is sent when meeting mobility load balance trigger condition , the loading information to be transferred of the first community is carried in the mobile load transfer request；Mobile load transfer decision-making Module 52 is used for according to the mobile load transfer request, and the load information reported using all cells in compass of competency is The first community determines optimal transfer path；Sending module 53, which is used to send to the cell on the optimal transfer path, to be moved Transfer command is loaded, the information of the optimal transfer path is carried in the mobile load transfer command, so that described optimal turn The cell moved on path carries out load transfer according to the optimal transfer path.

Wherein, the load information that cell is reported includes load capacity, admissible maximum load transfer amount, the cell frequency of cell Spectrum efficiency, mobile load transfer decision-making module 52 specifically for：

It is that each load capacity exceedes heavy duty door according to the load capacity of all cells in the control node compass of competency The cell of limit determines to include cell-of-origin and candidate target cells on candidate's transfer path set, every candidate's transfer path, described Cell-of-origin is the cell that load capacity exceedes heavy duty thresholding, and the candidate target cells include adjacent with cell-of-origin one cell jumped Or adjacent with cell-of-origin one cell for jumping to N jumps, N is integer more than 1；And, according to the source on every candidate's transfer path The load capacity to be transferred of cell, the admissible maximum load transfer amount in candidate target cells, the spectrum efficiency of two neighboring cell The ratio between, it is that the first community chooses optimal transfer path from candidate's transfer path set of the first community.

Preferably, also it is including what terminal was shifted in candidate's transfer terminal set and candidate in the load information that cell is reported System performance information.Mobile load transfer decision-making module 52 can also be after candidate's transfer path set be determined, for every candidate The candidate carried in path, the load information reported according to other cells on candidate's transfer path in addition to final jump cell Shift terminal set and candidate shifts the system performance information of terminal, determine that candidate shifts the transfer priority of terminal, according to The order of priority from low to high is shifted, the systematic function of candidate's transfer terminal is gradually reduced.Correspondingly, the mobile load turns The candidate's transfer terminal set for moving the cell also carried in order on the optimal transfer path and candidate shift terminal Priority, so that the cell on the optimal transfer path shifts the order of the transfer priority of terminal from high to low according to candidate Choose candidate's transfer terminal and carry out load transfer.

Preferably, mobile load transfer decision-making module 52 can determine that candidate shifts the transfer priority of terminal according to formula 9 Then transfer priority factors are mapped as corresponding transfer priority, according to transfer priority factors from small to large by the factor Sequentially, corresponding transfer priority is gradually stepped up.

Preferably, receiving module 51 can also receive the mobile load transfer termination request that the cell in the range of administration is sent, It is that the cell in the control node compass of competency turns according to the mobile load received that the mobile load transfer, which terminates request, Order is moved to move during load is shifted according to the system performance index decision system hydraulic performance decline counted on to setting Sent when below thresholding.Correspondingly, can also be terminated according to the mobile load transfer please for mobile load transfer decision-making module 52 The corresponding transfer path of determination is sought, and the transfer corresponding to request is terminated to the mobile load transfer by the sending module Cell on path sends mobile load transfer and terminates order, and the mobile load transfer, which terminates order, to be used to indicate to terminate movement Load transfer process simultaneously carries out parameters back.

Preferably, candidate's transfer path i is the candidate on any one candidate's transfer path, candidate's transfer path i The condition that Target cell is met is the same as those described above, and will not be repeated here.

It is the structural representation of base station provided in an embodiment of the present invention referring to Fig. 6.As illustrated, the base station may include：System Meter and reporting module 61, mobile load transfer request module 62, mobile load transfer performing module 63, and can further comprise： Statistical module 64, mobile load transfer termination request module 65 and mobile load transfer terminate the dotted line in performing module 66, figure Represent to there may be annexation between related two modules, annexation can also be not present.Wherein：

Statistics and reporting module 61 are used for the control node load information reporting to the cell for administering this base station, the load Information includes load capacity, admissible maximum load transfer amount, the cell spectrum efficiency of cell；

Mobile load transfer request module 62 is used for when the cell for adjudicating this base station meets mobility load balance trigger condition When, sent to the control node in mobile load transfer request, the mobile load transfer request and carry treating for this cell Transferring load amount information；

Mobile load transfer performing module 63, which is used to work as, receives the mobile load transfer command that the control node is sent Afterwards, load transfer is carried out according to the mobile information for loading the optimal transfer path carried in transfer command, the movement is born It is that the control node is sent according to the mobile load transfer request received to carry transfer command；Wherein, the optimal transfer Path is that the control node is determined by following steps：

It is that each load capacity exceedes heavy duty door according to the load capacity of all cells in the control node compass of competency The cell of limit determines to include cell-of-origin and candidate target cells on candidate's transfer path set, every candidate's transfer path, described Cell-of-origin is the cell that load capacity exceedes heavy duty thresholding, and the candidate target cells include adjacent with cell-of-origin one cell jumped Or adjacent with cell-of-origin one cell for jumping to N jumps, N is integer more than 1；According to the cell-of-origin on every candidate's transfer path The ratio between load capacity to be transferred, the admissible maximum load transfer amount in candidate target cells, spectrum efficiency of two neighboring cell, be The cell for sending mobile load transfer request chooses optimal transfer path from candidate's transfer path set of the cell.

Preferably, statistics and reporting module 61 may further determine that candidate's transfer terminal set and candidate shift the transfer of terminal Priority；Or, determine that candidate's transfer terminal set and candidate shift the system performance information of terminal, and candidate is shifted eventually The system performance information of end set and candidate's transfer terminal reports the control node.In the mobile load transfer command Also carry candidate's transfer terminal set and candidate shifts the priority of terminal.Mobile load transfer performing module 63 can be according to The order of the transfer priority of candidate's transfer terminal from high to low chooses candidate's transfer terminal from candidate's transfer terminal set, its In, the transfer priority of candidate's transfer terminal is that this cell is determined, or shifts life from the mobile load received Got in order；According to the optimal transfer path carried in the mobile load transfer command, the candidate of selection is shifted eventually The load at end is transferred to the next-hop cell on the optimal transfer path.

Preferably, statistics and reporting module 61 can be when it is determined that candidate shift terminal set, on candidate's transfer path i Cell _ j, cell _ j candidate transfer terminal set meet following condition：Positioned at cell _ j edge, and in cell _ j with Cell _ j+1's is overlapping covered interior；Wherein, candidate's transfer path i is any one candidate's transfer path；Cell _ j with it is small Area _ j+1 is the upper two adjacent cells of candidate's transfer path i；J represents the hop count to cell-of-origin, and 0≤j≤N-1, N turns for candidate The path i total hop count of cell is moved, it is the cell-of-origin on candidate's transfer path i that corresponding cell is represented during j=0.

Preferably, statistics and reporting module 61 can be true according to formula 9 when it is determined that candidate shifts the transfer priority of terminal Determine the transfer priority factors that candidate shifts terminal, transfer priority factors are then mapped as corresponding transfer priority, pressed According to the order of transfer priority factors from small to large, corresponding transfer priority is gradually stepped up.

Preferably, statistical module 64 is used in the mobile load transfer performing module according to the mobile load transfer life During the information of the optimal transfer path carried in order carries out load transfer, statistical system performance；Mobile load transfer is eventually Only request module 65 is used for：If according to the obtained system performance index decision system hydraulic performance decline of statistics to setting below thresholding, Then mobile load transfer is sent to the control node terminate request；Mobile load transfer, which terminates performing module 66, to be used for：When connecing Receive after the mobile load transfer termination order that the control node is sent, terminate the mobile load transfer process currently carried out simultaneously Parameters back is carried out, it is that the control node is shifted eventually according to the mobile load received that the mobile load transfer, which terminates order, Sent after only asking to the cell on corresponding transfer path.

Preferably, the system performance index of statistics includes switching probability, too early switching probability, mistake switching too late generally Rate；Mobile load transfer terminate performing module 66 specifically for：

If being determined there occurs according to the statistical result of the switching probability too late, too early switching probability, mistake switching probability Switch too late, then by the cell personalization skew CIO up-regulations of this cell to next-hop cell, and update the value model of the CIO Enclose, the lower limit of the span is more than the value of CIO when occurring to switch too late；

If being determined there occurs according to the statistical result of the switching probability too late, too early switching probability, mistake switching probability Switching too early, then lower the CIO of this cell to next-hop cell, and updates the span of the CIO, makes the value model Higher limit in enclosing is less than the value of CIO when occurring switching too early；

If being determined there occurs according to the statistical result of the switching probability too late, too early switching probability, mistake switching probability Handoff error, then lower the CIO of this cell to next-hop cell, and notify the next-hop cell by the next-hop cell CIO to this cell is lowered, and updates the span of the CIO, is less than the higher limit in the span and occurs mistake The value of CIO when switching by mistake.

Wherein, the next-hop cell is on the transfer path corresponding to the mobile load transfer process being currently terminated, The next-hop cell of described cell.

Preferably, mobile load transfer terminates performing module 66 and can be additionally used in：After parameters back is carried out, get parms History handover failure rate before rollback, if the history handover failure rate before parameters back is higher than given threshold, is closed The mobility load balance function of this cell.

Preferably, statistics and reporting module 61 may further determine that candidate's transfer terminal set and candidate shift the transfer of terminal Priority；Or, determine that candidate's transfer terminal set and candidate shift the system performance information of terminal, and candidate is shifted eventually The system performance information of end set and candidate's transfer terminal reports the control node, in the mobile load transfer command Also carry candidate's transfer terminal set and candidate shifts the priority of terminal.Correspondingly, statistics and reporting module 61 are true During fixed load capacity to be transferred, shifted according to the order of transfer priority from high to low from candidate in terminal set and choose at least one Candidate shifts terminal, and all candidates of selection are shifted to the load capacity sum of terminal, are defined as load capacity to be transferred.

In summary, mobility load balance scheme provided in an embodiment of the present invention makes full use of the existing statistics of existing network, Optimal resolving Algorithm etc., changes business load distribution, Radio Resource is kept higher utilization ratio, while ensureing the industry set up The QoS of business so that the load between each cell is more balanced, the capacity of system gets a promotion, and reduces the performance that congestion is caused Deteriorate.Improve MLB grade of fit and the degree of accuracy, improve performance of handoffs and user satisfaction, reduction conversation loss rate, reduce The deterioration of KPI indexs, it is significant to Radio Network System adjacent section planning.

The present invention is the flow with reference to method according to embodiments of the present invention, equipment (system) and computer program product Figure and/or block diagram are described.It should be understood that can be by every first-class in computer program instructions implementation process figure and/or block diagram Journey and/or the flow in square frame and flow chart and/or block diagram and/or the combination of square frame.These computer programs can be provided Instruct the processor of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing devices so that A stream in flow chart can be achieved by the instruction of the computing device of the computer or other programmable data processing devices The function of being specified in journey or multiple flows and/or one square frame of block diagram or multiple square frames.

These computer program instructions, which may be alternatively stored in, can guide computer or other programmable data processing devices with spy Determine in the computer-readable memory that mode works so that the instruction being stored in the computer-readable memory, which is produced, to be included referring to Make the manufacture of device, the command device realize in one flow of flow chart or multiple flows and/or one square frame of block diagram or The function of being specified in multiple square frames.

These computer program instructions can be also loaded into computer or other programmable data processing devices so that in meter Series of operation steps is performed on calculation machine or other programmable devices to produce computer implemented processing, thus in computer or The instruction performed on other programmable devices, which is provided, to be used to realize the flow or multiple flows and/or block diagram in flow chart A square frame or multiple square frames in specify function the step of.

, but those skilled in the art once know basic creation although preferred embodiments of the present invention have been described Property concept, then can make other change and modification to these embodiments.So, appended claims are intended to be construed to include excellent Select embodiment and fall into having altered and changing for the scope of the invention.

Obviously, those skilled in the art can carry out the essence of various changes and modification without departing from the present invention to the present invention God and scope.So, if these modifications and variations of the present invention belong to the scope of the claims in the present invention and its equivalent technologies Within, then the present invention is also intended to comprising including these changes and modification.

Claims

1. a kind of Mobile load balancing method, it is characterised in that including：

Control node receives the mobile load transfer request that the first community in the range of administration is sent, and the mobile load transfer please First community judgement meets what is sent during mobility load balance trigger condition described in Seeking Truth, is taken in the mobile load transfer request Loading information to be transferred with the first community；

The control node is according to the mobile load letter for loading transfer request, being reported using all cells in compass of competency Breath, is that the first community determines optimal transfer path；

The control node sends mobile load transfer command to the cell on the optimal transfer path, and the mobile load turns Move candidate's transfer terminal set that the information of the optimal transfer path, cell on the optimal transfer path are carried in order And candidate shifts the priority of terminal, so that the cell on the optimal transfer path is carried out according to the optimal transfer path Load is shifted, and shifts the order selection candidate's transfer of the priority of terminal from high to low according to candidate when carrying out load transfer Terminal carries out load transfer；

Wherein, the load information that cell is reported includes load capacity, admissible maximum load transfer amount, the cell spectrum effect of cell Rate, candidate's transfer terminal set and candidate shift the system performance information of terminal；It is all small in the utilization compass of competency The load information that area is reported, is that the first community determines optimal transfer path, specifically includes：

It is that each mobility load balance that meets triggers bar according to the load capacity of all cells in the control node compass of competency The cell of part determines to include cell-of-origin and candidate target cells on candidate's transfer path set, every candidate's transfer path, described Cell-of-origin is the cell for meeting mobility load balance trigger condition, and the candidate target cells include adjacent with cell-of-origin one jump Cell or adjacent with cell-of-origin one cell for jumping to N jumps, N is integer more than 1；

For every path candidate, the load reported according to other cells on candidate's transfer path in addition to final jump cell The candidate's transfer terminal combination carried in information and candidate shift the system performance information of terminal, determine candidate's transfer terminal Priority is shifted, according to the order of transfer priority from low to high, the systematic function of candidate's transfer terminal is gradually reduced；

According to the load capacity to be transferred of the cell-of-origin on every candidate's transfer path, the admissible maximum load in candidate target cells The ratio between transfer amount, spectrum efficiency of two neighboring cell, are candidate transfer path of the first community from the first community Optimal transfer path is chosen in set.

2. the method as described in claim 1, it is characterised in that the transfer priority of the determination candidate transfer terminal includes：

According to below equation, determine that candidate shifts the transfer priority factors of terminal：

<mfenced open = "" close = ""> <mtable> <mtr> <mtd> <mrow> <msub> <mi>&gamma;</mi> <mi>i</mi> </msub> <mo>=</mo> <mi>f</mi> <mi>l</mi> <mi>o</mi> <mi>o</mi> <mi>r</mi> <mo>(</mo> <mi>&alpha;</mi> <mo>&CenterDot;</mo> <mfrac> <mrow> <msub> <mi>RSRP</mi> <mi>i</mi> </msub> </mrow> <mrow> <msub> <mi>RSRP</mi> <mrow> <mi>max</mi> <mo>,</mo> <mi>i</mi> </mrow> </msub> </mrow> </mfrac> <mo>+</mo> <mi>&beta;</mi> <mo>&CenterDot;</mo> <mfrac> <mrow> <msub> <mi>SINR</mi> <mrow> <mi>u</mi> <mi>l</mi> <mo>_</mo> <mi>i</mi> </mrow> </msub> <mo>+</mo> <msub> <mi>SINR</mi> <mrow> <mi>d</mi> <mi>l</mi> <mo>_</mo> <mi>i</mi> </mrow> </msub> </mrow> <mrow> <msub> <mi>SINR</mi> <mrow> <mi>u</mi> <mi>l</mi> <mo>_</mo> <mi>max</mi> <mo>,</mo> <mi>i</mi> </mrow> </msub> <mo>+</mo> <msub> <mi>SINR</mi> <mrow> <mi>d</mi> <mi>l</mi> <mo>_</mo> <mi>max</mi> <mo>,</mo> <mi>i</mi> </mrow> </msub> </mrow> </mfrac> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <mo>+</mo> <mo>&part;</mo> <mo>&CenterDot;</mo> <mfrac> <mrow> <msub> <mi>Service</mi> <mrow> <mi>u</mi> <mi>l</mi> <mo>_</mo> <mi>i</mi> </mrow> </msub> <mo>+</mo> <msub> <mi>Service</mi> <mrow> <mi>d</mi> <mi>l</mi> <mo>_</mo> <mi>i</mi> </mrow> </msub> </mrow> <mrow> <msub> <mi>Service</mi> <mrow> <mi>u</mi> <mi>l</mi> <mo>_</mo> <mi>max</mi> <mo>,</mo> <mi>i</mi> </mrow> </msub> <mo>+</mo> <msub> <mi>Service</mi> <mrow> <mi>d</mi> <mi>l</mi> <mo>_</mo> <mi>max</mi> <mo>,</mo> <mi>i</mi> </mrow> </msub> </mrow> </mfrac> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <mo>+</mo> <mi>&theta;</mi> <mo>&CenterDot;</mo> <mfrac> <mrow> <mi>P</mi> <mo>_</mo> <msub> <mi>shedule</mi> <mrow> <mi>u</mi> <mi>l</mi> <mo>_</mo> <mi>i</mi> </mrow> </msub> <mo>+</mo> <mi>P</mi> <mo>_</mo> <msub> <mi>shedule</mi> <mrow> <mi>d</mi> <mi>l</mi> <mo>_</mo> <mi>i</mi> </mrow> </msub> </mrow> <mrow> <mi>P</mi> <mo>_</mo> <msub> <mi>shedule</mi> <mrow> <mi>u</mi> <mi>l</mi> <mo>_</mo> <mi>max</mi> <mo>,</mo> <mi>i</mi> </mrow> </msub> <mo>+</mo> <mi>P</mi> <mo>_</mo> <msub> <mi>shedule</mi> <mrow> <mi>d</mi> <mi>l</mi> <mo>_</mo> <mi>max</mi> <mo>,</mo> <mi>i</mi> </mrow> </msub> </mrow> </mfrac> <mo>)</mo> </mrow> </mtd> </mtr> </mtable> </mfenced>

Wherein, γ_iRepresent that candidate shifts the transfer priority factors of terminal i；α、β、θ span is [0,1]； RSRP_iRepresent the receiving power RSRP of the reference signal of candidate's transfer terminal i；SINR_{ul_i}、SINR_{dl_i}Candidate's transfer is represented respectively The Physical Uplink Shared Channel PUSCH of terminal i Signal to Interference plus Noise Ratio SINR and Physical Downlink Shared Channel PDSCH Signal to Interference plus Noise Ratio SINR；Service_{ul_i}、Service_{dl_i}Represent that candidate shifts up, the downlink user speed of terminal i respectively；P_ shedule_{ul_i}、P_shedule_{dl_i}Represent that candidate shifts up, the descending scheduling probability of terminal i respectively；RSRP_max,iRepresent system Maximum in system in the RSRP of all terminals；SINR_{ul_max,i}、SINR_{dl_max,i}All terminals in expression system respectively PUSCH SINR maximum and PDSCH SINR maximum, Service_{ul_max,i}、Service_{dl_max,i}System is represented respectively The maximum in maximum and downlink user speed in the uplink user speed of interior all terminals；P_shedule_{ul_max,i}、P_ shedule_{dl_max,i}Respectively in the maximum and descending scheduling probability in expression system in the uplink scheduling probability of all terminals Maximum；Floor () represents to round downwards；

Transfer priority factors are mapped as corresponding transfer priority, according to the order of transfer priority factors from small to large, Corresponding transfer priority is gradually stepped up.

3. the method as described in claim 1, it is characterised in that also include：

The control node receives the mobile load transfer termination request that the cell in the range of administration is sent, and the mobile load turns It is that the cell in the control node compass of competency is moved according to the mobile load transfer command received to move and terminate request Sent when during load transfer according to below the system performance index decision system hydraulic performance decline counted on to setting thresholding 's；

The control node shifts to terminate and asks to determine corresponding transfer path according to the mobile load, to the mobile load The cell that transfer is terminated on the transfer path corresponding to request sends mobile load transfer and terminates order, the mobile load transfer Terminating order is used to indicate to terminate mobile load transfer process and carries out parameters back.

4. the method as any one of claim 1-3, it is characterised in that candidate's transfer path i is any one candidate Candidate target cells on transfer path, candidate's transfer path i meet following condition：

Cell _ j and cell _ j+1 exist it is overlapping covered, and it is described it is overlapping covered in cell _ j terminal is distributed with；

As j=0, load capacity _ j>Heavy duty thresholding；

As j >=1, heavy duty thresholding-load capacity _ j ＞ isolation j, heavy duty thresholding-load capacity _ j+1 ＞ isolations _ j+ 1, and, isolation _ j<Isolation _ j+1；

Wherein, cell _ j and cell _ j+1 are the cell that any two is adjacent on candidate's transfer path i；J represents to arrive cell-of-origin Hop count, j >=0；It is the cell-of-origin on candidate's transfer path i that corresponding cell is represented during j=0；Load capacity _ j is that cell _ j is current Load capacity, isolation _ j is predetermined threshold value of the cell-of-origin on candidate's transfer path i to cell _ j；Load capacity _ j+1 is small Load capacity current area _ j+1, isolation _ j+1 is cell-of-origin on candidate's transfer path i to the default threshold values of cell _ j+1.

5. one kind load moving equilibrium method, it is characterised in that including：

Cell in control node compass of competency is to the control node load information reporting, and the load information includes cell Load capacity, admissible maximum load transfer amount, cell spectrum efficiency, candidate's transfer terminal set and candidate shift terminal System performance information；

When the cell judgement in the control node compass of competency meets mobility load balance trigger condition, saved to the control Point sends the loading information to be transferred that this cell is carried in mobile load transfer request, the mobile load transfer request；

After the cell in the control node compass of competency receives the mobile load transfer command that the control node is sent, According to the cell on the mobile information for loading the optimal transfer path carried in transfer command, the optimal transfer path Candidate shifts terminal set and the priority of candidate's transfer terminal carries out load transfer, according to time during the progress load transfer The order of the transfer priority of choosing transfer terminal from high to low chooses candidate's transfer terminal and carries out load transfer, the mobile load Transfer command is that the control node is sent according to the mobile load transfer request received；Wherein, the optimal transfer road Footpath is that the control node is determined by following steps：

It is that each load capacity exceedes heavy duty thresholding according to the load capacity of all cells in the control node compass of competency Cell determines that, including cell-of-origin and candidate target cells on candidate's transfer path set, every candidate's transfer path, the source is small Area be load capacity exceed heavy duty thresholding cell, the candidate target cells include adjacent with cell-of-origin one jump cell or with The cell of N jumps is jumped in cell-of-origin adjacent one, and N is the integer more than 1；

For every path candidate, the load reported according to other cells on candidate's transfer path in addition to final jump cell The candidate's transfer terminal set carried in information and candidate shift the system performance information of terminal, determine candidate's transfer terminal Priority is shifted, according to the order of transfer priority from low to high, the systematic function of candidate's transfer terminal is gradually reduced；

According to the load capacity to be transferred of the cell-of-origin on every candidate's transfer path, the admissible maximum load in candidate target cells The ratio between transfer amount, spectrum efficiency of two neighboring cell, to send the mobile cell for loading transfer request from the cell Optimal transfer path is chosen in candidate's transfer path set.

6. method as claimed in claim 5, it is characterised in that the determination candidate shifts terminal set, including：

For cell _ j on candidate's transfer path i, cell _ j candidate's transfer terminal set meets following condition：Positioned at small Area _ j edge, and it is overlapping covered interior in cell _ j and cell _ j+1；

Wherein, candidate's transfer path i is any one candidate's transfer path；Cell _ j and cell _ j+1 is candidate's transfer path i Upper two adjacent cells；J represents the hop count to cell-of-origin, 0≤j≤N-1, and N is the candidate's transfer path i total hop count of cell, j It is the cell-of-origin on candidate's transfer path i that corresponding cell is represented when=0.

7. method as claimed in claim 5, it is characterised in that the determination process of the transfer priority of candidate's transfer terminal Including：

8. method as claimed in claim 5, it is characterised in that according to optimal turn carried in the mobile load transfer command The information for moving path also include during load transfer：

Statistical system performance；

If the system performance index decision system hydraulic performance decline obtained according to statistics is saved to setting below thresholding to the control Point sends mobile load transfer and terminates request；

After the mobile load transfer termination order that the control node is sent is received, terminate the mobile load currently carried out and turn Move past journey and carry out parameters back, it is that the control node is negative according to the movement received that the mobile load transfer, which terminates order, Idling, which is moved, terminates what is sent after request to the cell on corresponding transfer path.

9. method as claimed in claim 8, it is characterised in that the system performance index of statistics include too late switching probability, Too early switching probability, mistake switching probability；

The carry out parameters back, one of comprises the following steps or combination：

If being determined to there occurs too late according to the statistical result of the switching probability too late, too early switching probability, mistake switching probability Switching, then by the cell personalization skew CIO up-regulations of this cell to next-hop cell, and update the span of the CIO, make The lower limit of the span is more than the value of CIO when occurring to switch too late；

If being determined to there occurs too early according to the statistical result of the switching probability too late, too early switching probability, mistake switching probability Switching, then lower the CIO of this cell to next-hop cell, and updates the span of the CIO, makes in the span Higher limit be less than occur too early switching when the CIO value；

If being determined to be switched according to the statistical result of the switching probability too late, too early switching probability, mistake switching probability Mistake, then lower the CIO of this cell to next-hop cell, and notifies the next-hop cell by the next-hop cell to originally The CIO of cell is lowered, and updates the span of the CIO, the higher limit in the span is cut less than making a mistake The value of CIO when changing；

Wherein, the next-hop cell is on the transfer path corresponding to the mobile load transfer process being currently terminated, described The next-hop cell of this cell.

10. method as claimed in claim 8, it is characterised in that also include after parameters back：

The history handover failure rate got parms before retracting, if the history handover failure rate before parameters back is higher than setting Threshold value, then close the mobility load balance function of this cell.

11. method as claimed in claim 5, it is characterised in that also include after receiving the mobile load transfer command：

If receiving terminal access request, judge whether the terminal for initiating the access request is located at the center of this cell Domain, if so, then receiving the access request；And/or,

If receiving handover request, judge whether the terminal that will switch is located at the central area of this cell, if so, then connecing By the handover request.

12. method as claimed in claim 5, it is characterised in that the cell in control node compass of competency also determines that candidate turns Move terminal set and candidate shifts the transfer priority of terminal；Or, determine candidate's transfer terminal set and candidate's transfer The system performance information of terminal, and the system performance information that candidate is shifted into terminal set and candidate's transfer terminal reports institute Control node is stated, candidate's transfer terminal set is also carried in the mobile load transfer command and candidate shifts the excellent of terminal First level；

The determination process of the load capacity to be transferred includes：

At least one candidate transfer terminal is chosen out of candidate transfer terminal set according to the order of transfer priority from high to low；

All candidates of selection are shifted to the load capacity sum of terminal, are defined as load capacity to be transferred.

13. method as claimed in claim 12, it is characterised in that the load capacity of candidate's transfer terminal includes ascending load amount And/or down load amount；

The ascending load amount of candidate's transfer terminal is calculated according to below equation to be obtained：

<mrow> <msub> <mi>R</mi> <mrow> <mi>S</mi> <mo>_</mo> <mi>C</mi> <mo>_</mo> <mi>u</mi> <mi>l</mi> <mo>_</mo> <mi>i</mi> </mrow> </msub> <mo>=</mo> <mfrac> <mrow> <msub> <mi>Num</mi> <mrow> <mi>P</mi> <mi>R</mi> <mi>B</mi> <mo>_</mo> <mi>u</mi> <mi>l</mi> <mo>_</mo> <mi>i</mi> </mrow> </msub> </mrow> <msub> <mi>R</mi> <mrow> <mi>S</mi> <mi>B</mi> <mi>R</mi> <mo>_</mo> <mi>u</mi> <mi>l</mi> <mo>_</mo> <mi>i</mi> </mrow> </msub> </mfrac> <mo>&times;</mo> <msub> <mi>R</mi> <msub> <mi>m</mi> <mrow> <mi>u</mi> <mi>l</mi> <mo>_</mo> <mi>i</mi> </mrow> </msub> </msub> <mo>/</mo> <msub> <mi>N</mi> <mrow> <mi>P</mi> <mi>R</mi> <mi>B</mi> <mo>_</mo> <mi>u</mi> <mi>l</mi> </mrow> </msub> <mo>&times;</mo> <mrow> <mo>(</mo> <msub> <mi>UE</mi> <mrow> <mi>sin</mi> <mi>r</mi> <mo>_</mo> <mi>u</mi> <mi>l</mi> <mo>_</mo> <mi>i</mi> </mrow> </msub> <mo>/</mo> <msub> <mi>SINR</mi> <mrow> <mi>max</mi> <mo>_</mo> <mi>u</mi> <mi>l</mi> </mrow> </msub> <mo>)</mo> </mrow> </mrow>

Wherein, R_{S_C_ul_i}The ascending load amount of terminal i is shifted for a candidate；Num_{PRB_u_i}The up of terminal i is shifted for candidate It has been carried in a load statistics cycle and has taken total PRB quantity in average each chronomere；R_{SBR_u_i}Turn for candidate Move the up of terminal i and be carried on active service speed total in a load statistics cycle；R_{mul_i}Terminal i is shifted for candidate Up carrying upstream request bearer rate and up actual bearer speed take smaller value；N_{PRB_ul}For in each chronomere Total PRB quantity under uplink bandwidth；UE_{sinr_ul_i}The PUSCH of terminal i SINR, SINR is shifted for candidate_{max_ul}For system The PUSCH SINR of interior all terminals maximum；

The down load amount of candidate's transfer terminal is calculated according to below equation to be obtained：

<mrow> <msub> <mi>R</mi> <mrow> <mi>S</mi> <mo>_</mo> <mi>C</mi> <mo>_</mo> <mi>d</mi> <mi>l</mi> <mo>_</mo> <mi>i</mi> </mrow> </msub> <mo>=</mo> <mfrac> <mrow> <msub> <mi>Num</mi> <mrow> <mi>P</mi> <mi>R</mi> <mi>B</mi> <mo>_</mo> <mi>d</mi> <mi>l</mi> <mo>_</mo> <mi>i</mi> </mrow> </msub> </mrow> <msub> <mi>R</mi> <mrow> <mi>S</mi> <mi>B</mi> <mi>R</mi> <mo>_</mo> <mi>d</mi> <mi>l</mi> <mo>_</mo> <mi>i</mi> </mrow> </msub> </mfrac> <mo>&times;</mo> <msub> <mi>R</mi> <msub> <mi>m</mi> <mrow> <mi>d</mi> <mi>l</mi> <mo>_</mo> <mi>i</mi> </mrow> </msub> </msub> <mo>/</mo> <msub> <mi>N</mi> <mrow> <mi>P</mi> <mi>R</mi> <mi>B</mi> <mo>_</mo> <mi>d</mi> <mi>l</mi> <mo>_</mo> <mi>i</mi> </mrow> </msub> <mo>&times;</mo> <mrow> <mo>(</mo> <msub> <mi>UE</mi> <mrow> <mi>sin</mi> <mi>r</mi> <mo>_</mo> <mi>d</mi> <mi>l</mi> <mo>_</mo> <mi>i</mi> </mrow> </msub> <mo>/</mo> <msub> <mi>SINR</mi> <mrow> <mi>max</mi> <mo>_</mo> <mi>d</mi> <mi>l</mi> </mrow> </msub> <mo>)</mo> </mrow> </mrow>

Wherein, R_{S_C_dl_i}The down load amount of terminal i is shifted for candidate；Num_{PRB_dl_i}For candidate's transfer, terminal i is descending has held It is loaded in a load statistics cycle and takes total PRB quantity in average each chronomere；R_{SBR_dl_i}Terminal i is shifted for candidate It is descending to be carried on active service speed total in a load statistics cycle；Terminal i downlink bearing is shifted for candidate Downbound request bearer rate and descending actual bearer speed take smaller value；N_{PRB_dl}For downstream transmission in each chronomere Total PRB quantity, UE under width_{sinr_dl_i}The PDSCH of terminal i SINR, SINR is shifted for candidate_{max_dl}For all terminals in system PDSCH SINR maximum.

14. the method as any one of claim 5-13, it is characterised in that the admissible maximum load transfer amount Determination process include：

Admissible maximum load transfer amount is determined according to below equation：

Max_MobilityLoad_i=(Thrd-Load_i) * λ

Wherein, max_MobilityLoad_i is the admissible maximum load transfer amount of cell i；Thrd is the heavy duty of cell i Thresholding, Load_i is the current load capacity of cell i, 0 ＜ λ ＜ 1.

15. the method as any one of claim 5-13, it is characterised in that the load capacity of the cell includes up negative Carrying capacity and/or down load amount, the ascending load amount are represented with up Physical Resource Block PRB resource utilizations, described descending Load capacity is represented with descending PRB resource utilizations；

The up PRB resource utilizations are calculated according to below equation and obtained：

<mfenced open = "" close = ""> <mtable> <mtr> <mtd> <mrow> <mi>R</mi> <mi>s</mi> <mo>_</mo> <mi>c</mi> <mo>_</mo> <mi>u</mi> <mi>l</mi> <mo>=</mo> <mfrac> <mrow> <msub> <mi>Num</mi> <mrow> <mi>P</mi> <mi>R</mi> <mi>B</mi> <mo>_</mo> <mi>u</mi> </mrow> </msub> </mrow> <msub> <mi>R</mi> <mrow> <mi>S</mi> <mi>B</mi> <mi>R</mi> <mo>_</mo> <mi>u</mi> </mrow> </msub> </mfrac> <mo>&times;</mo> <munderover> <mi>&Sigma;</mi> <mrow> <msub> <mi>m</mi> <mi>u</mi> </msub> <mo>=</mo> <mn>1</mn> </mrow> <msub> <mi>M</mi> <mi>u</mi> </msub> </munderover> <msub> <mi>R</mi> <msub> <mi>m</mi> <mi>u</mi> </msub> </msub> <mo>/</mo> <msub> <mi>N</mi> <mrow> <mi>P</mi> <mi>R</mi> <mi>B</mi> <mo>_</mo> <mi>u</mi> </mrow> </msub> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <mo>&times;</mo> <munderover> <mi>&Sigma;</mi> <mrow> <msub> <mi>m</mi> <mi>u</mi> </msub> <mo>=</mo> <mn>1</mn> </mrow> <msub> <mi>M</mi> <mi>u</mi> </msub> </munderover> <mrow> <mo>(</mo> <msub> <mi>UE</mi> <mrow> <mi>sin</mi> <mi>r</mi> <mo>_</mo> <mi>u</mi> <mi>l</mi> </mrow> </msub> <mo>/</mo> <msub> <mi>SINR</mi> <mrow> <mi>max</mi> <mo>_</mo> <mi>u</mi> <mi>l</mi> </mrow> </msub> <mo>)</mo> </mrow> </mrow> </mtd> </mtr> </mtable> </mfenced>

Wherein, Rs_c_ul is the up PRB resource utilizations of cell i；Num_{PRB_u}All one has been carried on for cell i is up The PRB quantity taken in the load statistics cycle in average each chronomere；R_{SBR_u}All one has been carried on for cell i is up Total active service speed in the individual load statistics cycle；M_uFor when reaching in the load statistics cycle cell i it is up also existing and There is the quantity of the carrying of rate requirement；For m in cell i_uThe upstream request bearer rate and up reality of individual up carrying Bearer rate takes smaller value；N_{PRB_u}Total PRB quantity under uplink bandwidth for cell i in each chronomere；UE_{sinr_ul} For the PUSCH SINR, SINR of each terminal in cell i_{max_ul}For the maximum of the PUSCH SINR of all terminals in system；

The descending PRB resource utilizations are calculated according to below equation and obtained：

<mfenced open = "" close = ""> <mtable> <mtr> <mtd> <mrow> <mi>R</mi> <mi>s</mi> <mo>_</mo> <mi>c</mi> <mo>_</mo> <mi>d</mi> <mi>l</mi> <mo>=</mo> <mfrac> <mrow> <msub> <mi>Num</mi> <mrow> <mi>P</mi> <mi>R</mi> <mi>B</mi> <mo>_</mo> <mi>d</mi> </mrow> </msub> </mrow> <msub> <mi>R</mi> <mrow> <mi>S</mi> <mi>B</mi> <mi>R</mi> <mo>_</mo> <mi>d</mi> </mrow> </msub> </mfrac> <mo>&times;</mo> <munderover> <mi>&Sigma;</mi> <mrow> <msub> <mi>m</mi> <mi>d</mi> </msub> <mo>=</mo> <mn>1</mn> </mrow> <msub> <mi>M</mi> <mi>d</mi> </msub> </munderover> <msub> <mi>R</mi> <msub> <mi>m</mi> <mi>d</mi> </msub> </msub> <mo>/</mo> <msub> <mi>N</mi> <mrow> <mi>P</mi> <mi>R</mi> <mi>B</mi> <mo>_</mo> <mi>d</mi> </mrow> </msub> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <mo>&times;</mo> <munderover> <mi>&Sigma;</mi> <mrow> <msub> <mi>m</mi> <mi>d</mi> </msub> <mo>=</mo> <mn>1</mn> </mrow> <msub> <mi>M</mi> <mi>d</mi> </msub> </munderover> <mrow> <mo>(</mo> <msub> <mi>UE</mi> <mrow> <mi>sin</mi> <mi>r</mi> <mo>_</mo> <mi>d</mi> <mi>l</mi> </mrow> </msub> <mo>/</mo> <msub> <mi>SINR</mi> <mrow> <mi>max</mi> <mo>_</mo> <mi>d</mi> <mi>l</mi> </mrow> </msub> <mo>)</mo> </mrow> </mrow> </mtd> </mtr> </mtable> </mfenced>

Wherein, Rs_c_dl is the up PRB resource utilizations of cell i；Num_{PRB_d}All one has been carried on for cell i is descending The PRB quantity taken in the load statistics cycle in average each chronomere；R_{SBR_d}All one has been carried on for cell i is descending Total active service speed in the individual load statistics cycle；M_dFor when reaching in the load statistics cycle the descending of cell i also exist And have the quantity of the carrying of rate requirement；For the m of cell i_dThe downbound request bearer rate and descending reality of individual downlink bearing Border bearer rate takes smaller value；N_{PRB_d}For PRB quantity total under downstream transmission bandwidth in each chronomere of cell i； UE_{sinr_dl}For the SINR, SINR of the PDSCH of each terminal in cell i_{max_dl}For the PDSCH SINR of all terminals in system Maximum.

16. a kind of control node equipment, it is characterised in that including：

Receiving module, the mobile load transfer for receiving the transmission of the first community in this control node equipment compass of competency please Ask, the mobile load transfer request is that the first community judgement is sent when meeting mobility load balance trigger condition, institute State the loading information to be transferred that the first community is carried in mobile load transfer request；

Mobile load transfer decision-making module, for according to it is described it is mobile load transfer request, using all small in compass of competency The load information that area is reported, is that the first community determines optimal transfer path；

Sending module, for sending mobile load transfer command, the mobile load to the cell on the optimal transfer path Candidate's transfer termination set of the information of the optimal transfer path, cell on the optimal transfer path is carried in transfer command Conjunction and candidate shift the priority of terminal, so that the cell on the optimal transfer path is entered according to the optimal transfer path Row load is shifted, and shifts the order selection time of the transfer priority of terminal from high to low according to candidate in progress load transfer Choosing transfer terminal carries out load transfer；

Wherein, the load information that cell is reported includes load capacity, admissible maximum load transfer amount, the cell spectrum effect of cell Rate, candidate's transfer terminal set and candidate shift the system performance information of terminal, the mobile load transfer decision-making module tool Body is used for：

17. control node equipment as claimed in claim 16, it is characterised in that the mobile load transfer decision-making module is specific For：

18. control node equipment as claimed in claim 16, it is characterised in that

The receiving module is additionally operable to：The mobile load transfer termination request that the cell in the range of administration is sent is received, it is described to move It is cell in the control node compass of competency according to the mobile load transfer command received that dynamic load transfer, which terminates request, Move during load transfer according to the system performance index decision system hydraulic performance decline that counts on to set thresholding with Sent when lower；

The mobile load transfer decision-making module is additionally operable to：Request is terminated according to the mobile load transfer and determines corresponding transfer Path, and sent by the cell on the transfer path corresponding to the sending module to the mobile load transfer termination request Mobile load transfer terminates order, and the mobile load transfer, which terminates order, to be used to indicate that terminating mobile load transfer process goes forward side by side Row parameters back.

19. the control node equipment as any one of claim 16-18, it is characterised in that candidate's transfer path i is to appoint Candidate target cells on one candidate's transfer path of meaning, candidate's transfer path i meet following condition：

As j=0, load capacity _ j>Heavy duty thresholding；

20. a kind of base station, it is characterised in that including：

Statistics and reporting module, for the control node load information reporting to the cell for administering this base station, the load information Load capacity including cell, admissible maximum load transfer amount, cell spectrum efficiency, candidate's transfer terminal set and candidate Shift the system performance information of terminal；

Mobile load transfer request module, for when the cell for adjudicating this base station meets mobility load balance trigger condition, to The control node sends in mobile load transfer request, the mobile load transfer request and carries the to be transferred negative of this cell Carrying capacity information；

Mobile load transfer performing module, for after the mobile load transfer command of the control node transmission is received, root According to the time of the cell on the mobile information for loading the optimal transfer path carried in transfer command, the optimal transfer path The priority of choosing transfer terminal set and candidate's transfer terminal carries out load transfer, according to candidate during the progress load transfer Shift the order of the transfer priority of terminal from high to low and choose candidate's transfer terminal progress load transfer, the mobile load turns It is that the control node is sent according to the mobile load transfer request received to move order；Wherein, the optimal transfer path The control node is determined by following steps：

The order of the transfer priority of terminal from high to low selection candidate from candidate's transfer terminal set is shifted according to candidate to turn Terminal is moved, wherein, the transfer priority of candidate's transfer terminal is that this cell is determined, or negative from the movement received Carry what is got in transfer command；According to the optimal transfer path carried in the mobile load transfer command, by the time of selection The load of choosing transfer terminal is transferred to the next-hop cell on the optimal transfer path；

21. base station as claimed in claim 20, it is characterised in that the statistics and reporting module specifically for：It is determined that waiting During choosing transfer terminal set, for cell _ j on candidate's transfer path i, cell _ j candidate's transfer terminal set meets following Condition：Positioned at cell _ j edge, and it is overlapping covered interior in cell _ j and cell _ j+1；Wherein, candidate's transfer road Footpath i is any one candidate's transfer path；Cell _ j and cell _ j+1 is the upper two adjacent cells of candidate's transfer path i；J tables Show the hop count of cell-of-origin, 0≤j≤N-1, N is the candidate's transfer path i total hop count of cell, and corresponding cell is represented during j=0 For the cell-of-origin on candidate's transfer path i.

22. base station as claimed in claim 20, it is characterised in that the statistics and reporting module specifically for：It is determined that waiting During the transfer priority of choosing transfer terminal, according to below equation, determine that candidate shifts the transfer priority factors of terminal：

23. base station as claimed in claim 20, it is characterised in that also terminate request including statistical module, mobile load transfer Module and mobile load transfer terminate performing module；

The statistical module is used for：Carried in the mobile load transfer performing module according in the mobile load transfer command Optimal transfer path information carry out load transfer during, statistical system performance；

The mobile load transfer, which terminates request module, to be used for：If the system performance index decision system performance obtained according to statistics Drop to below setting thresholding, then sending mobile load transfer to the control node terminates request；

The mobile load transfer, which terminates performing module, to be used for：When the mobile load for receiving the control node transmission is shifted eventually After only ordering, terminate the mobile load transfer process currently carried out and carry out parameters back, the mobile load transfer terminates life Order is that the control node terminates the cell hair asked on backward corresponding transfer path according to the mobile load transfer received Send.

24. base station as claimed in claim 23, it is characterised in that the system performance index of statistics includes too late switching generally Rate, too early switching probability, mistake switching probability；

The mobile load transfer terminate performing module specifically for：

25. base station as claimed in claim 23, it is characterised in that the mobile load transfer terminates performing module and is additionally operable to： After parameters back is carried out, the history handover failure rate got parms before retracting, if the history before parameters back is cut Mortality is changed higher than given threshold, then closes the mobility load balance function of this cell.

26. the base station as any one of claim 20-25, it is characterised in that

The statistics and reporting module are additionally operable to：Determine that candidate's transfer terminal set and the transfer of candidate's transfer terminal are preferential Level；Or, determine that candidate's transfer terminal set and candidate shift the system performance information of terminal, and candidate is shifted into termination set Close and the system performance information of candidate's transfer terminal reports the control node, also taken in the mobile load transfer command Terminal set is shifted with candidate and candidate shifts the priority of terminal；

It is described statistics and reporting module specifically for：It is determined that during load capacity to be transferred, according to transfer priority from high to low Order chooses at least one candidate transfer terminal out of candidate transfer terminal set, and all candidates of selection are shifted into the negative of terminal Carrying capacity sum, is defined as load capacity to be transferred.