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CN104918287A - Load balancing method and device - Google Patents

Load balancing method and device Download PDF

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Publication number
CN104918287A
CN104918287A CN201510329533.9A CN201510329533A CN104918287A CN 104918287 A CN104918287 A CN 104918287A CN 201510329533 A CN201510329533 A CN 201510329533A CN 104918287 A CN104918287 A CN 104918287A
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CN
China
Prior art keywords
switched
community
target cell
edge termination
load balancing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN201510329533.9A
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Chinese (zh)
Other versions
CN104918287B (en
Inventor
高志斌
陈灿彬
黄联芬
李钰洁
刘震
廖礼宇
李馨
张远见
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Xiamen University
Comba Network Systems Co Ltd
Original Assignee
Xiamen University
Comba Telecom Systems Guangzhou Co Ltd
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Priority to CN201510329533.9A priority Critical patent/CN104918287B/en
Publication of CN104918287A publication Critical patent/CN104918287A/en
Application granted granted Critical
Publication of CN104918287B publication Critical patent/CN104918287B/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/08—Load balancing or load distribution
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/16—Performing reselection for specific purposes
    • H04W36/22—Performing reselection for specific purposes for handling the traffic
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The invention discloses a load balancing method and device. The method comprises the following steps: when a current cell is overloaded, acquiring measurement reports reported by terminals; determining edge terminals to be switched and corresponding target cells to be switched from the terminals according to the measurement reports; determining the load balance factors of the edge terminals to be switched according to the load information of the current cell and the load information of the target cells to be switched; determining switched edge terminals and switched target cells from the edge terminals to be switched according to the load balance factors; and switching the edge terminals to be switched corresponding to the load balance factors having greatest load influences on the current cell and the target cells to be switched to the target cells to be switched corresponding to the edge terminals to be switched. Through a way of selecting the switched edge terminals and target cells via the determined load balance factors, the problem of overload of the switched cells during load balancing can be solved.

Description

A kind of method of load balancing and device
Technical field
The present invention relates to communication technical field, particularly relate to a kind of method and device of load balancing.
Background technology
SON (Self-Organizing Networks, self-organizing network) be LTE (Long Term Evolution, Long Term Evolution) important part, can the management of simplified network, reduce the operation maintenance cost of network and improve the operational efficiency of network.Mobility load balance technology is one of important use-case in SON.Distribution due to mobile network's flow has timeliness and the uneven characteristic of spatiality, and the load caused between community is unequal.Adopt mobility load balance technology can reduce the load of high capacity community, realize the load balancing of minizone, reach network resource utilization and maximize.
Mobility load balance technology is mainly divided into two classes: a kind of method by self-adaptative adjustment handoff parameter realizes the load balancing of community; The another kind of neighbor cell selecting load value lower by high capacity community is Target cell, certain customers is switched to the load balancing that Target cell realizes community.The former coordinates the mobility of user to realize load balancing by the self-adaptative adjustment of handoff parameter, and the load balancing reaction caused for bursts of traffic is slower.Although the latter can realize load balancing fast, mobile robust (Robust) property is caused damage, causes pingpang handoff, the situations such as the loss of radio link failure and user QoS (Quality of Service, service quality).In load balancing process, the switching problem of user is mainly choosing of Target cell and choosing of changeable user.Load-balancing method in the past mainly concentrates on these two aspects and is optimized load balancing process.
Chinese patent CN 102905307 A " realizing Neighboring Cell List and load balancing combined optimization system " discloses and a kind ofly sets up by Neighboring Cell List the optimization that module realizes load balancing, but reduces the execution efficiency of load balancing by the load balancing process of the adjustment mode of handoff parameter.Chinese patent CN 102625369 A " classification ensures the load balance optimization method that different brackets QoS of customer requires " discloses and a kind ofly carries out load balancing switching according to different user grade, preferentially ensures that high ranked user bit-rate requirements and the maximum user of prioritizing selection occupying system resources number carry out the method switched.This method is not enough for the consideration of Target cell, may cause the situation of partial target cell-overload.
In sum, need a kind of method of load balancing badly, in order to carry out equilibrium to the community of high capacity, avoid the community after causing switching to occur overload phenomenon.
Summary of the invention
The embodiment of the present invention provides a kind of method and device of load balancing, to improve the efficiency of load balancing.
The embodiment of the present invention provides a kind of method of load balancing, and the method comprises:
When this cell load transships, obtain the measurement report of terminal to report;
According to described measurement report, from described terminal, determine the to be switched Target cell of to be switched edge termination and correspondence thereof;
According to the load information of this community and the load information of described to be switched Target cell, determine the load balancing factors of described to be switched edge termination, described load balancing factors is switched to load effect to this community described and described to be switched Target cell behind described to be switched Target cell for weighing described to be switched edge termination;
By to be switched edge termination corresponding for the load balancing factors maximum to the load effect of this community described and described to be switched Target cell, switch to the to be switched Target cell that described to be switched edge termination is corresponding.
Preferably, according to described measurement report, from described terminal, determine the to be switched Target cell of to be switched edge termination and correspondence thereof, comprising:
Obtain this community of terminal to report and the Reference Signal Received Power of adjacent cell thereof;
According to the Reference Signal Received Power of this community described and adjacent cell thereof, determine the Signal to Interference plus Noise Ratio of this community described and adjacent cell thereof;
The to be switched Target cell of to be switched edge termination and correspondence thereof is determined according to following formula:
SINR s-SINR j≤2HM 0-HM sj
Wherein, SINR sfor the Signal to Interference plus Noise Ratio of this community, SINR jfor the Signal to Interference plus Noise Ratio of Target cell, HM 0for switching the initial value of side-play amount between community, HM sjfor the switching side-play amount that to be switched edge termination switches from this community to be switched Target cell.
Preferably, the load balancing factors of described to be switched edge termination is determined according to following formula:
α = N i , j N j + N i , j - N i , s N s - N i , s
Wherein, α is the load balancing factors of to be switched edge termination, N i,jfor the Resource Block RB number of to be switched Target cell j required for the service rate of satisfied i-th to be switched edge termination, N jfor to be switched Target cell j is the RB number meeting all terminal traffic rate requirement in its community, N i,sfor the RB number of this community s required for the service rate demand of satisfied i-th to be switched edge termination, N sfor this community s is the RB number meeting all terminal traffic rate requirement in its community, i > 0, s > 0, j > 0.
Preferably, described determine the load balancing factors of described to be switched edge termination after, also comprise:
By the load balancing factors of described to be switched edge termination, to be switched Target cell and correspondence thereof stored in be switched user list, and according to the size of described load balancing factors, all load balancing factors in described to be switched user list are sorted, choose to be switched edge termination corresponding to the load balancing factors that the load effect of this community described and described to be switched Target cell is maximum and to be switched Target cell.
Preferably, by be switched edge termination corresponding for the load balancing factors maximum to the load effect of this community described and described to be switched Target cell, after switching to be switched Target cell corresponding to described to be switched edge termination, also comprise:
If the load value of this community described is less than overload threshold value, then in setting-up time, suspend load balancing, and suspend the load balancing of the adjacent cell accepting this community described.
Correspondingly, the embodiment of the present invention additionally provides a kind of device of load balancing, comprising:
Acquisition module, for when this cell load transships, obtains the measurement report of terminal to report;
First determination module, for according to described measurement report, determines the to be switched Target cell of to be switched edge termination and correspondence thereof from described terminal;
Second determination module, for according to the load information of this community and the load information of described to be switched Target cell, determine the load balancing factors of described to be switched edge termination, described load balancing factors is switched to load effect to this community described and described to be switched Target cell behind described to be switched Target cell for weighing described to be switched edge termination;
Handover module, for by be switched edge termination corresponding for the load balancing factors maximum to the load effect of this community described and described to be switched Target cell, switches to the to be switched Target cell that described to be switched edge termination is corresponding.
Preferably, described first determination module specifically for:
Obtain this community of terminal to report and the Reference Signal Received Power of adjacent cell thereof;
According to the Reference Signal Received Power of this community described and adjacent cell thereof, determine the Signal to Interference plus Noise Ratio of this community described and adjacent cell thereof;
The to be switched Target cell of described to be switched edge termination and correspondence thereof is determined according to following formula:
SINR s-SINR j≤2HM 0-HM sj
Wherein, SINR sfor the Signal to Interference plus Noise Ratio of this community, SINR jfor the Signal to Interference plus Noise Ratio of Target cell, HM 0for switching the initial value of side-play amount between community, HM sjfor the switching side-play amount that to be switched edge termination switches from this community to be switched Target cell.
Preferably, described second determination module, specifically for:
The load balancing factors of described to be switched edge termination is determined according to following formula:
α = N i , j N j + N i , j - N i , s N s - N i , s
Wherein, α is the load balancing factors of to be switched edge termination, N i,jfor the Resource Block RB number of to be switched Target cell j required for the service rate of satisfied i-th to be switched edge termination, N jfor to be switched Target cell j is the RB number meeting all terminal traffic rate requirement in its community, N i,sfor the RB number of this community s required for the service rate demand of satisfied i-th to be switched edge termination, N sfor this community s is the RB number meeting all terminal traffic rate requirement in its community, i > 0, s > 0, j > 0.
Preferably, described second determination module also for:
Described determine the load balancing factors of described to be switched edge termination after, by the load balancing factors of described to be switched edge termination, to be switched Target cell and correspondence thereof stored in be switched user list, and according to the size of described load balancing factors, all load balancing factors in described to be switched user list are sorted, choose to be switched edge termination corresponding to the load balancing factors that the load effect of this community described and described to be switched Target cell is maximum and to be switched Target cell.
Preferably, described handover module also for:
By to be switched edge termination corresponding for the load balancing factors maximum to the load effect of this community described and described to be switched Target cell, after switching to be switched Target cell corresponding to described to be switched edge termination, if the load value of this community described is less than overload threshold value, then in setting-up time, suspend load balancing, and suspend the load balancing of the adjacent cell accepting this community described.
In above-described embodiment, first by when this cell load transships, obtain the measurement report of terminal to report, according to described measurement report, the to be switched Target cell of to be switched edge termination and correspondence thereof is determined from described terminal, then according to the load information of this community described and the load information of described to be switched Target cell, determine the load balancing factors of described to be switched edge termination, according to described load balancing factors, the Target cell of carrying out edge termination and the switching switched is determined from described to be switched edge termination, finally by be switched edge termination corresponding for maximum load balance factor, switch to the to be switched Target cell that described to be switched edge termination is corresponding, by the load balancing factors determined, choose the mode of carrying out edge termination and the Target cell switched, can when carrying out load balancing, the community after switching is avoided to occur the problem of transshipping.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme in the embodiment of the present invention, below the accompanying drawing used required in describing embodiment is briefly introduced, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the schematic flow sheet of the method for a kind of load balancing in the embodiment of the present invention;
Fig. 2 is the schematic flow sheet of the method for another kind of load balancing in the embodiment of the present invention;
Fig. 3 is the structural representation of the device of a kind of load balancing in the embodiment of the present invention.
Embodiment
In order to make the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, the present invention is described in further detail, and obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making other embodiments all obtained under creative work prerequisite, belong to the scope of protection of the invention.
The network that the embodiment of the present invention provides is LTE network, and the embodiment of the present invention is not limited to described LTE network, is also applicable to other mobile network, only plays example effect herein.
Fig. 1 shows a kind of flow process of method of load balancing, and this flow process is performed by the device of load balancing, and this device can be positioned at base station, and also can be the central control device independent of base station, as shown in Figure 1, the concrete steps of this flow process comprise:
Step S101, when this cell load transships, obtains the measurement report of terminal to report.
Concrete, first carry out local load monitoring and calculating to this community, the load state of Bing Jiangzhe community reports, and (is the first overload threshold value ξ in the embodiment of the present invention when the load value of this community is greater than an overload threshold value 1, can be the overload threshold value empirically carrying out arranging, also can be carry out according to the loading level of community the overload threshold value that divides), during the load overload of Ji Zhe community, need to carry out load balancing to this community, obtain the measurement report of terminal to report.
Meanwhile, in above-mentioned steps S101, the mutual of load information can be carried out by X2 interface and its adjacent cell in this community, is stored into by the load information of adjacent cell in the list of adjacent cell load information.
Wherein, the load information of community can be: the load value of community; PRB (Physical Resource blocks, the Physical Resource Block) utilance of radio resource state uplink/downlink GBR (Guaranteed Bit Rate ensures bit rate) business; Available load value (capacity that uplink/downlink can be used for load balancing accounts for the percentage of total capacity); By the trigger load information reporting based on event.
What the measurement report got was mainly used in obtaining this community of terminal to report and RSRP (Reference Signal Received Power, Reference Signal Received Power) the Zhi Hezhe community of adjacent cell thereof and adjacent cell thereof can meet the information such as the service rate that terminal uses.
Step S102, according to described measurement report, determines the to be switched Target cell of to be switched edge termination and correspondence thereof from described terminal.
In step s 102, after getting measurement report, first be obtain this community of terminal to report and the RSRP value of adjacent cell thereof in described measurement report, then by the RSRP value of this community and adjacent cell thereof, SINR (the Signal to Interference plus Noise Ratio of conversion cost community and adjacent cell thereof, Signal to Interference plus Noise Ratio) value, wherein, SINR=RSRP/ (interference power+noise power), the SINR value of this community described and adjacent cell thereof can be determined, from described terminal, the to be switched Target cell of to be switched edge termination and correspondence thereof is determined again according to following formula (1):
SINR s-SINR j≤2HM 0-HM sj…………………………………………(1)
Wherein, SINR sfor the Signal to Interference plus Noise Ratio of this community, SINR jfor the Signal to Interference plus Noise Ratio of Target cell, HM 0for switching the initial value of side-play amount between community, HM sjfor the switching side-play amount that to be switched edge termination switches from this community to be switched Target cell, this switching side-play amount can empirically be arranged.
As long as meet terminal and the community of above-mentioned formula (1), be the to be switched Target cell of to be switched edge termination and correspondence thereof, the to be switched Target cell of described to be switched edge termination and correspondence thereof can be multiple, also can no one, can only be now terminate the equilibrium of this cell load, load balancing can not be carried out to this community.
Step S103, according to the load information of this community and the load information of described to be switched Target cell, determines the load balancing factors of described to be switched edge termination.
According to the load information of described step S101 Zhong Zhe community and adjacent cell thereof, the load value of Ji Zhe community and adjacent cell thereof, the load balancing factors of described to be switched edge termination is determined by following formula (2):
α - N i , j N j + N i , j - N i , s N s - N i , s ... ( 2 )
Wherein, α is the load balancing factors of to be switched edge termination, N i,jfor the Resource Block RB number of to be switched Target cell j required for the service rate of satisfied i-th to be switched edge termination, N jfor to be switched Target cell j is the RB number meeting all terminal traffic rate requirement in its community, N i,sfor the RB number of this community s required for the service rate demand of satisfied i-th to be switched edge termination, N sfor this community s is the RB number meeting all terminal traffic rate requirement in its community, i > 0, s > 0, j > 0.
Above-mentioned load balancing factors is switched to load effect to this community described and described to be switched Target cell behind described to be switched Target cell for weighing described to be switched edge termination, the determination of this load balancing factors, consider the load information of this community and to be switched Target cell simultaneously, can avoid after to be switched edge termination is switched to Target cell, occur the situation of Target cell load overload.When choosing load balancing factors, select load balancing factors value large as much as possible, the larger expression of load balancing factors value, the resource that to be switched edge termination takies this community is more, after taking the many edge termination switchings of this local resource, the load value of this community reduced is larger, and load balancing factors value is larger, represent that the load value of the to be switched Target cell that to be switched edge termination is corresponding is less, after to be switched edge termination is switched to be switched Target cell, to be switched Target cell can not be caused to occur overload phenomenon.After taking the maximum edge termination switching of this local resource, achieve and only switch the object that less terminal can reduce this cell load, improve the efficiency of load balance.In the embodiment of the present invention, the computational methods of balance factor are not limited to above-mentioned formula (2), and also can adopt other computational methods, the embodiment of the present invention is only example effect, does not limit this.
After the load balancing factors determining described to be switched edge termination, by the load balancing factors of described to be switched edge termination, to be switched Target cell and correspondence thereof stored in be switched user list, and according to the size of described load balancing factors, all load balancing factors in described to be switched user list are sorted, choose to be switched edge termination corresponding to the load balancing factors that the load effect of this community described and described to be switched Target cell is maximum and to be switched Target cell.This refers to the load balancing factors that the load effect of this community described and described to be switched Target cell is maximum the load balancing factors that load balancing factors value is maximum, having the greatest impact to this cell load, to refer to that to be switched edge termination takies the resource of this community maximum, after to be switched edge termination being switched, it is more that the load value of this community reduces; Treat switching target small area to have the greatest impact and refer to that the load value of the to be switched Target cell that to be switched edge termination is corresponding is minimum, after to be switched edge termination switches to this to be switched Target cell, this to be switched Target cell can not be caused to occur overload phenomenon.
Step S104, by be switched edge termination corresponding for the load balancing factors maximum to the load effect of this community described and described to be switched Target cell, switches to the to be switched Target cell that described to be switched edge termination is corresponding.
Concrete, according to the load balancing factors that the load effect of the expression chosen to be switched user list to this community described and described to be switched Target cell is maximum, by to be switched edge termination corresponding for the load balancing factors maximum to the load effect of this community described and described to be switched Target cell, switch to the to be switched Target cell that described to be switched edge termination is corresponding.The resource that the described to be switched edge termination of the larger expression of value of load balancing factors takies this community described is more, namely the ratio accounting for the load value of this community described is larger, and the load value of to be switched Target cell is also less, just can accomplish that only switching less terminal reaches the object reducing this cell load, decrease the expense of signaling, after terminal switch can being prevented by load balancing factors, cause Target cell to be transshipped simultaneously.
In said process, also can according to the load information of this community and Target cell, if after being switched by described to be switched edge termination, described to be switched terminal all more than the first overload threshold value, then can not switch by the load value of this community and Target cell.
Can also according to the load information of this community and Target cell, the to be switched edge termination that the to be switched Target cell selecting load value minimum is corresponding, switch to the Target cell that described to be switched edge termination is corresponding, then judge whether the load value of this community is also greater than the first overload threshold value, if so, then continue to carry out load balancing to this community.Simultaneously after load balancing is carried out to this community, the load information of this community of real-time update and adjacent cell thereof.
After described step S104, if it (is the second overload threshold value ξ in the embodiment of the present invention that the load value of this community described is less than overload threshold value 2, can be the overload threshold value empirically carrying out arranging, also can be carry out according to the loading level of community the overload threshold value that divides), then in setting-up time, suspend load balancing, and suspend the load balancing of the adjacent area accepting this community described.One load balancing can be set and terminate timer, when the load value of this community is less than the second overload threshold value, starting load equilibrium terminates timer, suspend this load balancing process, also can suspend the load balancing requests accepting adjacent cell simultaneously, after load balancing terminates timer expired, this community will allow the load balancing requests of adjacent cell again.Described setting-up time can empirically be arranged.
Above-described embodiment shows, by obtaining the measurement report of terminal to report, according to described measurement report, the to be switched Target cell of to be switched edge termination and correspondence thereof is determined from described terminal, then according to the load information of this community described and the load information of described to be switched Target cell, determine the load balancing factors of described to be switched edge termination, according to described load balancing factors, the Target cell of carrying out edge termination and the switching switched is determined from described to be switched edge termination, finally by be switched edge termination corresponding for maximum load balance factor, switch to the to be switched Target cell that described to be switched edge termination is corresponding, can when carrying out load balancing, the community after switching is avoided to occur the problem of transshipping.To be switched Target cell, the load balancing factors of to be switched edge termination and correspondence thereof is comprised in be switched user list in the embodiment of the present invention, represent the load balance degree of to be switched edge termination in be switched Target cell, and described to be switched user list can be dynamically updated.Can preferably more suitable to be switched edge termination and more suitable to be switched Target cell by the size of load balancing factors value, reach and switch less terminal and can obtain good load balancing effect, improve the execution efficiency of load balancing.
In order to better explain the present invention, Fig. 2 be the embodiment of the present invention under embody rule scene, the implementation process of the method for load balancing in mobile network.
Embodiment of the present invention Zhong Zhe community is s, has three adjacent cells, is j1, j2, j3.This community s is in order to meet RB (Resource Block, the Resource Block) number N required for current all terminal traffic rate requirement s=108.Adjacent cell j1, j2, j3 are respectively N in order to the RB number met in community required for all terminal traffic rate requirement j1=30, N j2=91, N j3=95.This community s has 4 edge terminations to be respectively u1, u2, u3 and u4.If the resource block number that u1, u2, u3 and u4 take is respectively N u1, s=4, N u2, s=5, N u3, s=10, N u4, s=10.And suppose the Physical Resource Block number N that community is total total=100, four communities all have identical Physical Resource Block number.
Step S201, carries out Real-Time Monitoring to cell load situation.
Observation process is mainly to the Measurement and analysis of data, and the load state of data to community according to measuring is analyzed, the load value of calculation plot.The calculating of load value adopts the computational methods of dummy load value, and the computing formula of dummy load value is as follows:
ρ = 1 N t o t a l Σ k = 1 n N k , j
ρ is the load value of community, N totalfor the available Physical Resource Block number that community is total, N k,jfor a kth terminal in jGe community is meet the Physical Resource Block number that its Service assurance speed needs take.According to the technical standard of TS36.213 in 3GPP (3rd Generation Partnership Project, third generation partner program), N k,jcan to table look-up acquisition according to the Service assurance speed of the coded modulation grade of terminal and terminal.Now this cell load value is
Step S202, judges whether the load value ρ of community is greater than ξ 1time, if yes then enter step S203, if otherwise return step S201.
ξ 1for an overload threshold value of cell setting.ξ 1can set according to the loading level of community, be greater than 1 expression cell-overload, the embodiment of the present invention arranges ξ 1be 1, now this community s transships.
Step S203, this community s sends a load information interaction signaling by X2 interface to neighbor cell, obtains the load information of neighbor cell.The load information of neighbor cell is stored in " list of adjacent cell load information ".This community s obtains the load information of adjacent cell j1, j2, j3.
The load information interaction being divided into preiodic type and event flip-over type alternately of load information, above-described information interaction is the information interaction of event flip-over type.
The load information of community can be: the load value of community; The PRB utilance of radio resource state uplink/downlink GBR traffic; Available load value (capacity that uplink/downlink can be used for load balancing accounts for the percentage of total capacity); By the trigger load information reporting based on event.
Step S204, obtains UE and reports RSRP information, comprise the RSRP of community, place and the RSRP value of adjacent cell.RSRP value according to terminal chooses edge termination, determines the switchable Target cell of edge termination simultaneously.
The terminal meeting formula (1) is judged to be edge termination, determines Target cell j simultaneously.When the corresponding Liang Ge community of a terminal or multiple community meet formula (1) simultaneously time, therefrom select best target cell according to load balancing factors.
SINR s-SINR j≤2HM 0-HM sj………………………………………………(1)
SINR sthe Signal to Interference plus Noise Ratio of Shi Zhe community s, unit is dB; SINR jrepresent the Signal to Interference plus Noise Ratio of Target cell j, unit is dB; HM 0for switching the initial value of side-play amount between community, unit is dB; HM sjfor the switching side-play amount that current service cell switches to Target cell, unit is dB.
If u3 detects the signal of community j2 and j3 simultaneously, and meet the situation of formula (1) simultaneously.Now, this community s calculates its load balancing factors α about j2 and j3 respectively to terminal u3 3, j2and α 3, j3.If α 3, j2>=α 3, j3, then select j2 to be Target cell, otherwise select j3 to be Target cell.
Obtain the load information of adjacent cell from " list of adjacent cell load information ", calculate the load balancing factors α of each edge termination according to the load information of adjacent cell and the load state of this community and terminal channel situation.Following formula (2) can be adopted to calculate:
α = N i , j N j + N i , j - N i , s N s - N i , s ... ( 2 )
N i,srepresent the RB number of this community s required for the service rate demand of satisfied i-th switching terminal; N srepresent that this community s is for meeting the RB number required for current all terminal traffic rate requirement; N i,jrepresent the RB number of Target cell j required for satisfied i-th switching terminal; N jbe Target cell j at current time for meeting the RB number in its community required for all terminal traffic rate requirement.Wherein N i,sand N i,jcan to table look-up acquisition according to 3GPP standard.The N of above formula s, N jcomputing formula as follows:
N s = Σ k = 1 M s N k , s , N j = Σ k = 1 M j N k , j
N s, N jrepresent the cumulative of the Resource Block in this community and Target cell required for all terminals respectively.M s, M jrepresent the sum of all terminals in this community and Target cell respectively.
Be applicable to the terminal switched according to α value prediction, α <0 is considered to be not suitable for switching terminal.According to the to be switched terminal of α value prediction, generate to be switched user list, and sort according to the size of α.In the terminal of applicable switching, the priority that α is larger is higher.
If the resource block number occupied after terminal switch is the same, both N u3, s=N u3, j2, terminal u3 corresponds to the load balancing factors of community j2 therefore terminal u3 can cause the load of community j2 higher than this community s after switching, and therefore terminal u3 is identified as and is not suitable for switching.Suppose that the Target cell that terminal u1, u2 and u4 are corresponding is j1, then obvious 0< α 1, j1< α 2, j1< α 4, j1, therefore the priority of terminal u4 is the highest, first switches terminal u4.The load of 9.3% can be shifted by switching terminal u4.If switch the load that u1 only displaced 3.7%.U1 and u2 is switched to the load that also only displaced 8.3% simultaneously.Therefore take the method for load balancing factors to improve the efficiency of switching, switch less terminal and reach and unload effect preferably, decrease the signaling consumption that terminal switch brings.
Step S205, when to be switched user list is empty, then represent that community is without to be switched terminal, load balancing process terminates, and goes to step S208; Otherwise go to step S206.
Step S206, selects the maximum terminal of α value to perform switching.Ji Zhe community s preferentially switches terminal u4.
Step S207, when the load value of this community is lower than a relatively low load-threshold value ξ 2time, then go to step S208, otherwise go to step S203 through step S209.Wherein, described ξ 2being carry out dividing according to the loading level of community, is a relatively low load-threshold value, optional 0.8; ξ 2< ξ 1load balancing process frequently can be prevented.
Step S208, start a load balancing and terminate timer T1, timing time is t 1.At t 1time Nei Zhe community s suspends the load balancing process of this community and suspends the load balancing handover request accepting neighbor cell, prevents load balancing process and pingpang handoff too frequently.After timer T1 time-out, this community s will allow the load balancing requests of its adjacent cell again.
Step S209, after having switched, upgrades the load information of this community, also upgrades the load information of neighbor cell simultaneously.
Based on identical inventive concept, Fig. 3 shows a kind of device of load balancing, and this device can perform the flow process of the method for load balancing, and this device can be positioned at base station, and also can be the central control device independent of base station, as shown in Figure 3, this device comprises:
Acquisition module 301, for when this cell load transships, obtains the measurement report of terminal to report;
First determination module 302, for according to described measurement report, determines the to be switched Target cell of to be switched edge termination and correspondence thereof from described terminal;
Second determination module 303, for according to the load information of this community and the load information of described to be switched Target cell, determine the load balancing factors of described to be switched edge termination, described load balancing factors is switched to load effect to this community described and described to be switched Target cell behind described to be switched Target cell for weighing described to be switched edge termination;
Handover module 304, for by be switched edge termination corresponding for the load balancing factors maximum to the load effect of this community described and described to be switched Target cell, switches to the to be switched Target cell that described to be switched edge termination is corresponding.
Preferably, described first determination module 302 specifically for:
Obtain this community of terminal to report and the Reference Signal Received Power of adjacent cell thereof;
According to the Reference Signal Received Power of this community described and adjacent cell thereof, determine the Signal to Interference plus Noise Ratio of this community described and adjacent cell thereof;
The to be switched Target cell of described to be switched edge termination and correspondence thereof is determined according to following formula:
SINR s-SINR j≤2HM 0-HM sj
Wherein, SINR sfor the Signal to Interference plus Noise Ratio of this community, SINR jfor the Signal to Interference plus Noise Ratio of Target cell, HM 0for switching the initial value of side-play amount between community, HM sjfor the switching side-play amount that to be switched edge termination switches from this community to be switched Target cell.
Preferably, described second determination module 303, specifically for:
The load balancing factors of described to be switched edge termination is determined according to following formula:
&alpha; = N i , j N j + N i , j - N i , s N s - N i , s
Wherein, α is the load balancing factors of to be switched edge termination, N i,jfor the Resource Block RB number of to be switched Target cell j required for the service rate of satisfied i-th to be switched edge termination, N jfor to be switched Target cell j is the RB number meeting all terminal traffic rate requirement in its community, N i,sfor the RB number of this community s required for the service rate demand of satisfied i-th to be switched edge termination, N sfor this community s is the RB number meeting all terminal traffic rate requirement in its community, i > 0, s > 0, j > 0.
Preferably, described second determination module 303 also for:
Described determine the load balancing factors of described to be switched edge termination after, by the load balancing factors of described to be switched edge termination, to be switched Target cell and correspondence thereof stored in be switched user list, and according to the size of described load balancing factors, all load balancing factors in described to be switched user list are sorted, choose to be switched edge termination corresponding to the load balancing factors that the load effect of this community described and described to be switched Target cell is maximum and to be switched Target cell.
Preferably, described handover module 304 also for:
By to be switched edge termination corresponding for the load balancing factors maximum to the load effect of this community described and described to be switched Target cell, after switching to be switched Target cell corresponding to described to be switched edge termination, if the load value of this community described is less than overload threshold value, then in setting-up time, suspend load balancing, and suspend the load balancing of the adjacent cell accepting this community described.
In sum, by obtaining the measurement report of terminal to report, according to described measurement report, the to be switched Target cell of to be switched edge termination and correspondence thereof is determined from described terminal, then according to the load information of this community described and the load information of described to be switched Target cell, determine the load balancing factors of described to be switched edge termination, according to described load balancing factors, the Target cell of carrying out edge termination and the switching switched is determined from described to be switched edge termination, finally by be switched edge termination corresponding for maximum load balance factor, switch to the to be switched Target cell that described to be switched edge termination is corresponding, can when carrying out load balancing, the community after switching is avoided to occur the problem of transshipping.To be switched Target cell, the load balancing factors of to be switched edge termination and correspondence thereof is comprised in be switched user list in the embodiment of the present invention, represent the load balance degree of to be switched edge termination in be switched Target cell, and described to be switched user list can be dynamically updated.Can preferably more suitable to be switched edge termination and more suitable to be switched Target cell by the size of load balancing factors value, reach less switching terminal and good load balancing effect, improve the execution efficiency of load balancing.
The present invention describes with reference to according to the flow chart of the method for the embodiment of the present invention, equipment (system) and computer program and/or block diagram.Should understand can by the combination of the flow process in each flow process in computer program instructions realization flow figure and/or block diagram and/or square frame and flow chart and/or block diagram and/or square frame.These computer program instructions can being provided to the processor of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing device to produce a machine, making the instruction performed by the processor of computer or other programmable data processing device produce device for realizing the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.
These computer program instructions also can be stored in can in the computer-readable memory that works in a specific way of vectoring computer or other programmable data processing device, the instruction making to be stored in this computer-readable memory produces the manufacture comprising command device, and this command device realizes the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.
These computer program instructions also can be loaded in computer or other programmable data processing device, make on computer or other programmable devices, to perform sequence of operations step to produce computer implemented process, thus the instruction performed on computer or other programmable devices is provided for the step realizing the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.
Although describe the preferred embodiments of the present invention, those skilled in the art once obtain the basic creative concept of cicada, then can make other change and amendment to these embodiments.So claims are intended to be interpreted as comprising preferred embodiment and falling into all changes and the amendment of the scope of the invention.
Obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.

Claims (10)

1. a method for load balancing, is characterized in that, described method comprises:
When this cell load transships, obtain the measurement report of terminal to report;
According to described measurement report, from described terminal, determine the to be switched Target cell of to be switched edge termination and correspondence thereof;
According to the load information of this community and the load information of described to be switched Target cell, determine the load balancing factors of described to be switched edge termination, described load balancing factors is switched to load effect to this community described and described to be switched Target cell behind described to be switched Target cell for weighing described to be switched edge termination;
By to be switched edge termination corresponding for the load balancing factors maximum to the load effect of this community described and described to be switched Target cell, switch to the to be switched Target cell that described to be switched edge termination is corresponding.
2. the method for claim 1, is characterized in that, according to described measurement report, determines the to be switched Target cell of to be switched edge termination and correspondence thereof, comprising from described terminal:
Obtain this community of terminal to report and the Reference Signal Received Power of adjacent cell thereof;
According to the Reference Signal Received Power of this community described and adjacent cell thereof, determine the Signal to Interference plus Noise Ratio of this community described and adjacent cell thereof;
The to be switched Target cell of to be switched edge termination and correspondence thereof is determined according to following formula:
SINR s-SINR j≤2HM 0-HM sj
Wherein, SINR sfor the Signal to Interference plus Noise Ratio of this community, SINR jfor the Signal to Interference plus Noise Ratio of Target cell, HM 0for switching the initial value of side-play amount between community, HM sjfor the switching side-play amount that to be switched edge termination switches from this community to be switched Target cell.
3. the method for claim 1, is characterized in that, determines the load balancing factors of described to be switched edge termination according to following formula:
&alpha; = N i , j N j + N i , j - N i , s N s - N i , s
Wherein, α is the load balancing factors of to be switched edge termination, N i,jfor the Resource Block RB number of to be switched Target cell j required for the service rate of satisfied i-th to be switched edge termination, N jfor to be switched Target cell j is the RB number meeting all terminal traffic rate requirement in its community, N i,sfor the RB number of this community s required for the service rate demand of satisfied i-th to be switched edge termination, N sfor this community s is the RB number meeting all terminal traffic rate requirement in its community, i > 0, s > 0, j > 0.
4. the method as described in any one of claims 1 to 3, is characterized in that, described determine the load balancing factors of described to be switched edge termination after, also comprise:
By the load balancing factors of described to be switched edge termination, to be switched Target cell and correspondence thereof stored in be switched user list, and according to the size of described load balancing factors, all load balancing factors in described to be switched user list are sorted, choose to be switched edge termination corresponding to the load balancing factors that the load effect of this community described and described to be switched Target cell is maximum and to be switched Target cell.
5. the method for claim 1, it is characterized in that, by to be switched edge termination corresponding for the load balancing factors maximum to the load effect of this community described and described to be switched Target cell, after switching to be switched Target cell corresponding to described to be switched edge termination, also comprise:
If the load value of this community described is less than overload threshold value, then in setting-up time, suspend load balancing, and suspend the load balancing of the adjacent cell accepting this community described.
6. a device for load balancing, is characterized in that, comprising:
Acquisition module, for when this cell load transships, obtains the measurement report of terminal to report;
First determination module, for according to described measurement report, determines the to be switched Target cell of to be switched edge termination and correspondence thereof from described terminal;
Second determination module, for according to the load information of this community and the load information of described to be switched Target cell, determine the load balancing factors of described to be switched edge termination, described load balancing factors is switched to load effect to this community described and described to be switched Target cell behind described to be switched Target cell for weighing described to be switched edge termination;
Handover module, for by be switched edge termination corresponding for the load balancing factors maximum to the load effect of this community described and described to be switched Target cell, switches to the to be switched Target cell that described to be switched edge termination is corresponding.
7. device as claimed in claim 6, is characterized in that, described first determination module specifically for:
Obtain this community of terminal to report and the Reference Signal Received Power of adjacent cell thereof;
According to the Reference Signal Received Power of this community described and adjacent cell thereof, determine the Signal to Interference plus Noise Ratio of this community described and adjacent cell thereof;
The to be switched Target cell of described to be switched edge termination and correspondence thereof is determined according to following formula:
SINR s-SINR j≤2HM 0-HM sj
Wherein, SINR sfor the Signal to Interference plus Noise Ratio of this community, SINR jfor the Signal to Interference plus Noise Ratio of Target cell, HM 0for switching the initial value of side-play amount between community, HM sjfor the switching side-play amount that to be switched edge termination switches from this community to be switched Target cell.
8. device as claimed in claim 6, is characterized in that, described second determination module, specifically for:
The load balancing factors of described to be switched edge termination is determined according to following formula:
&alpha; = N i , j N j + N i , j - N i , s N s - N i , s
Wherein, α is the load balancing factors of to be switched edge termination, N i,jfor the Resource Block RB number of to be switched Target cell j required for the service rate of satisfied i-th to be switched edge termination, N jfor to be switched Target cell j is the RB number meeting all terminal traffic rate requirement in its community, N i,sfor the RB number of this community s required for the service rate demand of satisfied i-th to be switched edge termination, N sfor this community s is the RB number meeting all terminal traffic rate requirement in its community, i > 0, s > 0, j > 0.
9. the device as described in any one of claim 6 to 8, is characterized in that, described second determination module also for:
Described determine the load balancing factors of described to be switched edge termination after, by the load balancing factors of described to be switched edge termination, to be switched Target cell and correspondence thereof stored in be switched user list, and according to the size of described load balancing factors, all load balancing factors in described to be switched user list are sorted, choose to be switched edge termination corresponding to the load balancing factors that the load effect of this community described and described to be switched Target cell is maximum and to be switched Target cell.
10. device as claimed in claim 6, is characterized in that, described handover module also for:
By to be switched edge termination corresponding for the load balancing factors maximum to the load effect of this community described and described to be switched Target cell, after switching to be switched Target cell corresponding to described to be switched edge termination, if the load value of this community described is less than overload threshold value, then in setting-up time, suspend load balancing, and suspend the load balancing of the adjacent cell accepting this community described.
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CN105163351A (en) * 2015-10-21 2015-12-16 重庆邮电大学 Multi-cell resource allocation algorithm based on energy efficiency in LTE system
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CN114390625B (en) * 2022-01-26 2023-02-28 哈尔滨工业大学（深圳） Control method and device for base station switching, storage medium and electronic equipment

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