CN104918287B - A kind of method and device of load balancing - Google Patents
A kind of method and device of load balancing Download PDFInfo
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- CN104918287B CN104918287B CN201510329533.9A CN201510329533A CN104918287B CN 104918287 B CN104918287 B CN 104918287B CN 201510329533 A CN201510329533 A CN 201510329533A CN 104918287 B CN104918287 B CN 104918287B
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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
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- 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
Abstract
The invention discloses a kind of method and device of load balancing, this method includes：When this cell load overloads, the measurement report that terminal reports is obtained；According to the measurement report, to be switched edge termination and its corresponding to be switched Target cell are determined from the terminal, according to the load information of described cell and the load information of the to be switched Target cell, determine the load balancing factors of the to be switched edge termination, according to the load balancing factors, the Target cell of the edge termination and switching that switch over is determined from the to be switched edge termination, by the corresponding to be switched edge termination of the maximum load balancing factors of load effect to described cell and the to be switched Target cell, switch to the corresponding to be switched Target cell of the to be switched edge termination, pass through determining load balancing factors, choose the mode of the edge termination and Target cell that switch over, it can be when carrying out load balancing, avoid the problem that the cell after switching is overloaded.
Description
Technical field
The present invention relates to field of communication technology more particularly to a kind of method and devices of load balancing.
Background technology
SON (Self-Organizing Networks, self-organizing network) is LTE (Long Term Evolution, length
Phase evolution) important component part, the management of network can be simplified, the operation maintenance cost of network is reduced and improve the fortune of network
Line efficiency.Mobility load balance technology is one of important use-case in SON.Due to mobile network's flow distribution have timeliness and
The non-uniform characteristic of spatiality, the load caused between cell are unequal.Height can be reduced using mobility load balance technology
The load balancing of minizone is realized in the load of loaded cell, reaches network resource utilization maximization.
Mobility load balance technology is broadly divided into two classes：A kind of method by adaptively adjusting handoff parameter realizes cell
Load balancing；It is Target cell that another kind selects the lower neighboring community of load value by high load cell, by certain customers
It is switched to the load balancing that Target cell realizes cell.The former coordinates the mobility of user by the adaptive adjustment of handoff parameter
Realize load balancing, load balancing reaction is slower for caused by bursts of traffic.Although the latter can fast implement load
Equilibrium, but mobile robust (Robust) property is damaged, cause pingpang handoff, radio link failure and user QoS
Situations such as loss of (Quality of Service, service quality).The switching problem of user is mainly during load balancing
The selection of the selection of Target cell and changeable user.It is equal to loading that previous load-balancing method is concentrated mainly on these two aspects
Weighing apparatus process optimizes.
102905307 A of Chinese patent CN《Realize neighboring cell list and load balancing combined optimization system》Disclose one kind
The optimization that module realizes load balancing, but the load balancing process for passing through the adjustment mode of handoff parameter are established by neighboring cell list
Reduce the execution efficiency of load balancing.102625369 A of Chinese patent CN《Classification ensures different brackets QoS of customer
It is required that load balance optimization method》It discloses a kind of according to the progress load balancing switching of different user grade, preferential guarantee height
The method that class user bit-rate requirements and the preferential user for selecting occupying system resources number most switch over.This method pair
It is insufficient in the Target cell the considerations of, the situation of partial target cell-overload may be caused.
In conclusion there is an urgent need for a kind of method of load balancing, it is balanced to be carried out to the cell of high load, it avoids causing to cut
There is overload phenomenon in cell after changing.
Invention content
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 this method includes：
When this cell load overloads, the measurement report that terminal reports is obtained；
According to the measurement report, determine that be switched edge termination and its corresponding to be switched target are small from the terminal
Area；
According to the load information of this cell and the load information of the to be switched Target cell, the to be switched edge is determined
The load balancing factors of terminal, the load balancing factors for weigh the to be switched edge termination be switched to it is described to be switched
To the load effect of described cell and the to be switched Target cell after Target cell；
The maximum load balancing factors of load effect to described cell and the to be switched Target cell are corresponding
To be switched edge termination switches to the corresponding to be switched Target cell of the to be switched edge termination.
Preferably, according to the measurement report, to be switched edge termination and its corresponding to be cut is determined from the terminal
Target cell is changed, including：
Obtain the Reference Signal Received Power of this cell and its adjacent cell that terminal reports；
According to the Reference Signal Received Power of described cell and its adjacent cell, described cell and its adjacent cell are determined
Signal to Interference plus Noise Ratio；
To be switched edge termination and its corresponding to be switched Target cell are determined according to following formula：
SINRs-SINRj≤2HM0-HMsj
Wherein, SINRsFor the Signal to Interference plus Noise Ratio of this cell, SINRjFor the Signal to Interference plus Noise Ratio of Target cell, HM0It is cut between cell
Change the initial value of offset, HMsjThe switching offset switched from this cell to be switched Target cell for be switched edge termination.
Preferably, the load balancing factors of the to be switched edge termination are determined according to following formula：
Wherein, α is the load balancing factors of to be switched edge termination, Ni,jIt is satisfaction i-th for be switched Target cell j
The required resource block RB numbers of service rate of to be switched edge termination, NjIt is to meet in its cell for be switched Target cell j
The RB numbers of all terminal traffic rate requirements, Ni,sIt is the service rate need for meeting i-th of to be switched edge termination for this cell s
Ask required RB numbers, NsIt is the RB numbers for meeting all terminal traffic rate requirements in its cell for this cell s, i ＞ 0, s ＞ 0,
J ＞ 0.
Preferably, after the load balancing factors of the determination to be switched edge termination, further include：
The to be switched edge termination, to be switched Target cell and its corresponding load balancing factors are stored in be cut use instead
Family list, and according to the size of the load balancing factors to load balancing factors all in the to be switched user list into
Row sequence, chooses corresponding to the maximum load balancing factors of load effect of described cell and the to be switched Target cell
To be switched edge termination and to be switched Target cell.
Preferably, will to the maximum load balance of load effect of described cell and the to be switched Target cell because
The corresponding to be switched edge termination of son, switches to after the corresponding to be switched Target cell of the to be switched edge termination, also wraps
It includes：
If the load value of described cell is less than overload threshold value, in setting time, suspend load balancing, and suspend
Receive the load balancing of the adjacent cell of described cell.
Correspondingly, the embodiment of the present invention additionally provides a kind of device of load balancing, including：
Acquisition module, for when this cell load overloads, obtaining the measurement report that terminal reports；
First determining module, for according to the measurement report, determined from the terminal to be switched edge termination and its
Corresponding to be switched Target cell；
Second determining module is used for according to the load information of this cell and the load information of the to be switched Target cell,
Determine that the load balancing factors of the to be switched edge termination, the load balancing factors are whole for weighing the to be switched edge
Hold the load effect to described cell and the to be switched Target cell after being switched to the to be switched Target cell；
Handover module, for putting down load maximum to the load effect of described cell and the to be switched Target cell
The corresponding to be switched edge termination of the factor that weighs, switches to the corresponding to be switched Target cell of the to be switched edge termination.
Preferably, first determining module is specifically used for：
Obtain the Reference Signal Received Power of this cell and its adjacent cell that terminal reports；
According to the Reference Signal Received Power of described cell and its adjacent cell, described cell and its adjacent cell are determined
Signal to Interference plus Noise Ratio；
The to be switched edge termination and its corresponding to be switched Target cell are determined according to following formula：
SINRs-SINRj≤2HM0-HMsj
Wherein, SINRsFor the Signal to Interference plus Noise Ratio of this cell, SINRjFor the Signal to Interference plus Noise Ratio of Target cell, HM0It is cut between cell
Change the initial value of offset, HMsjThe switching offset switched from this cell to be switched Target cell for be switched edge termination.
Preferably, second determining module, is specifically used for：
The load balancing factors of the to be switched edge termination are determined according to following formula：
Wherein, α is the load balancing factors of to be switched edge termination, Ni,jIt is satisfaction i-th for be switched Target cell j
The required resource block RB numbers of service rate of to be switched edge termination, NjIt is to meet in its cell for be switched Target cell j
The RB numbers of all terminal traffic rate requirements, Ni,sIt is the service rate need for meeting i-th of to be switched edge termination for this cell s
Ask required RB numbers, NsIt is the RB numbers for meeting all terminal traffic rate requirements in its cell for this cell s, i ＞ 0, s ＞ 0,
J ＞ 0.
Preferably, second determining module is additionally operable to：
After the load balancing factors of the determination to be switched edge termination, by the to be switched edge termination,
To be switched Target cell and its corresponding load balancing factors are stored in be switched user list, and according to the load balancing factors
Size load balancing factors all in the to be switched user list are ranked up, choose to described cell and described
The corresponding to be switched edge termination of the maximum load balancing factors of load effect of to be switched Target cell and to be switched target are small
Area.
Preferably, the handover module is additionally operable to：
The maximum load balancing factors of the load effect of described cell and the to be switched Target cell will corresponded to
To be switched edge termination, switch to after the corresponding to be switched Target cell of the to be switched edge termination, if described is small
The load value in area is less than overload threshold value, then in setting time, suspends load balancing, and suspend the neighbour for receiving described cell
The load balancing of cell.
In above-described embodiment, first by when this cell load overloads, obtaining the measurement report that terminal reports；According to institute
Measurement report is stated, to be switched edge termination and its corresponding to be switched Target cell are determined from the terminal, then according to institute
The load information of this cell and the load information of the to be switched Target cell are stated, determines the load of the to be switched edge termination
Balance factor, according to the load balancing factors, determined from the to be switched edge termination edge termination switched over and
The Target cell of switching switches to described to be cut change sides finally by the corresponding to be switched edge termination of maximum load balance factor
The corresponding to be switched Target cell of edge terminal chooses the edge termination and mesh switched over by determining load balancing factors
The mode of cell is marked, can avoid the problem that the cell after switching is overloaded when carrying out load balancing.
Description of the drawings
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment
Attached drawing is briefly introduced, it should be apparent that, drawings in the following description are only some embodiments of the invention, for this
For the those of ordinary skill in field, without creative efforts, other are can also be obtained according to these attached drawings
Attached drawing.
Fig. 1 is a kind of flow diagram of the method for load balancing in the embodiment of the present invention；
Fig. 2 is the flow diagram of the method for another load balancing in the embodiment of the present invention；
Fig. 3 is a kind of structural schematic diagram of the device of load balancing in the embodiment of the present invention.
Specific implementation mode
To make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with attached drawing to the present invention make into
It is described in detail to one step, it is clear that described embodiments are only a part of the embodiments of the present invention, rather than whole implementation
Example.Based on the embodiments of the present invention, obtained by those of ordinary skill in the art without making creative efforts
All other embodiment, shall fall within the protection scope of the present invention.
The network that the embodiment of the present invention is provided is LTE network, and the embodiment of the present invention is not limited to the LTE network, also
Suitable for other mobile networks, only play the role of example herein.
Fig. 1 shows that a kind of flow of the method for load balancing, the flow are executed by the device of load balancing, which can
Can also be the central control device independently of base station to be located in base station, as shown in Figure 1, the specific steps of the flow include：
Step S101 obtains the measurement report that terminal reports when this cell load overloads.
Specifically, carrying out local load monitoring and calculating to this cell first, and the load state of this cell is reported, when
(it is the first overload threshold value ξ in the embodiment of the present invention when load value of this cell is more than an overload threshold value1, can be according to
The overload threshold value being configured according to experience can also be the overload threshold value divided according to the loading level of cell), i.e.,
It when the load overload of this cell, needs to carry out load balancing to this cell, obtains the measurement report that terminal reports.
Meanwhile in above-mentioned steps S101, this cell can carry out the friendship of load information by X2 interface and its adjacent cell
Mutually, the load information of adjacent cell is stored into adjacent cell load information list.
Wherein, the load information of cell can be：The load value of cell；Radio resource state uplink/downlink GBR
PRB (the Physical Resource blocks, physical resource of (Guaranteed Bit Rate, ensures bit rate) business
Block) utilization rate；Available load value (capacity that uplink/downlink can be used for load balancing accounts for the percentage of total capacity)；By being based on
The triggering load information of event reports.
The measurement report got is mainly used for obtaining the RSRP of this cell and its adjacent cell that terminal reports
(Reference Signal Received Power, Reference Signal Received Power) value and this cell and its adjacent cell can be with
Meet the information such as the service rate that terminal uses.
Step S102 determines to be switched edge termination from the terminal and its corresponding waits for according to the measurement report
Switching target small area.
In step s 102, it is to obtain the sheet that terminal reports in the measurement report first after getting measurement report
The RSRP values of cell and its adjacent cell, then by this cell and its RSRP values of adjacent cell, conversion cost cell and its adjacent cell
SINR (Signal to Interference plus Noise Ratio, Signal to Interference plus Noise Ratio) value, wherein SINR=RSRP/
(jamming power+noise power), you can the SINR value for determining described cell and its adjacent cell, further according to following formula (1) from
To be switched edge termination and its corresponding to be switched Target cell are determined in the terminal：
SINRs-SINRj≤2HM0-HMsj…………………………………………(1)
Wherein, SINRsFor the Signal to Interference plus Noise Ratio of this cell, SINRjFor the Signal to Interference plus Noise Ratio of Target cell, HM0It is cut between cell
Change the initial value of offset, HMsjFor the switching offset that be switched edge termination switches from this cell to be switched Target cell,
The switching offset can be empirically configured.
As long as meeting the terminal and cell of above-mentioned formula (1), as to be switched edge termination and its corresponding to be switched
Target cell, the to be switched edge termination and its corresponding to be switched Target cell can be it is multiple, can also one do not have yet
Have, can only be to terminate the equilibrium of this cell load at this time, load balancing cannot be carried out to this cell.
Step S103, according to the load information of this cell and the load information of the to be switched Target cell, determine described in
The load balancing factors of to be switched edge termination.
According to the load information of this cell and its adjacent cell in the step S101, i.e., this cell and its adjacent cell is negative
Load value determines the load balancing factors of the to be switched edge termination by following formula (2)：
Wherein, α is the load balancing factors of to be switched edge termination, Ni,jIt is satisfaction i-th for be switched Target cell j
The required resource block RB numbers of service rate of to be switched edge termination, NjIt is to meet in its cell for be switched Target cell j
The RB numbers of all terminal traffic rate requirements, Ni,sIt is the service rate need for meeting i-th of to be switched edge termination for this cell s
Ask required RB numbers, NsIt is the RB numbers for meeting all terminal traffic rate requirements in its cell for this cell s, i ＞ 0, s ＞ 0,
J ＞ 0.
Above-mentioned load balancing factors are for weighing after the to be switched edge termination is switched to the to be switched Target cell
To the load effect of described cell and the to be switched Target cell, the determination of the load balancing factors, while considering this
The load information of cell and to be switched Target cell can go out to avoid after to be switched edge termination is switched to Target cell
The case where existing Target cell load overload.When choosing load balancing factors, as far as possible select load balancing factors values big,
The bigger expression of load balancing factors value, the resource that be switched edge termination occupies this cell is more, and it is more will to occupy this local resource
Edge termination switching after, the load value of this cell of reduction is bigger, and load balancing factors value is bigger, indicates to be cut to change sides
The load value of the corresponding to be switched Target cell of edge terminal is smaller, and to be switched edge termination is switched to be switched Target cell
Afterwards, to be switched Target cell will not be caused overload phenomenon occur.It is real after the edge termination switching most by this local resource is occupied
Show and only switched less terminal and can reduce the purpose of this cell load, has improved the efficiency of load balance.The present invention is implemented
The computational methods of balance factor are not limited to above-mentioned formula (2) in example, and other computational methods, the present invention can also be used to implement
Example is only example effect, is limited not to this.
After the load balancing factors for determining the to be switched edge termination, by the to be switched edge termination, to be cut
It changes Target cell and its corresponding load balancing factors is stored in be switched user list, and according to the big of the load balancing factors
It is small that load balancing factors all in the to be switched user list are ranked up, it chooses to described cell and described to be cut
Change the corresponding to be switched edge termination of the maximum load balancing factors of load effect of Target cell and to be switched Target cell.It should
The maximum load balancing factors of load effect to described cell and the to be switched Target cell refer to load balancing factors
It is worth maximum load balancing factors, it refers to that be switched edge termination occupies the resource of this cell most to influence maximum to this cell load
More, after to be switched edge termination is switched, the load value of this cell reduces more；Treating switching target small area influence maximum is
The load value for referring to the corresponding to be switched Target cell of to be switched edge termination is minimum, and it is to be switched that be switched edge termination switches to this
After Target cell, the to be switched Target cell will not be caused overload phenomenon occur.
Step S104, by the maximum load balance of load effect of described cell and the to be switched Target cell because
The corresponding to be switched edge termination of son, switches to the corresponding to be switched Target cell of the to be switched edge termination.
Specifically, small to described cell and the to be switched target according to the expression chosen to be switched user list
The maximum load balancing factors of load effect in area, by the load effect of described cell and the to be switched Target cell most
The corresponding to be switched edge termination of big load balancing factors switches to the corresponding to be switched target of the to be switched edge termination
Cell.The bigger resource for indicating that the to be switched edge termination occupies described cell of value of load balancing factors is more, that is, accounts for
The ratio of the load value of described cell is bigger, and the load value of to be switched Target cell is also just smaller, so that it may to accomplish only to cut
It changes less terminal to achieve the purpose that reduce this cell load, reduces the expense of signaling, while passing through load balancing factors energy
Enough prevent terminal switching from causing Target cell to overload later.
It, can also be according to this cell and the load information of Target cell, if by the to be switched edge in the above process
After terminal switches over, the load value of this cell and Target cell does not all exceed the first overload threshold value, then will be described to be cut
Terminal is changed to switch over.
The to be switched Target cell pair of load value minimum can also be selected according to this cell and the load information of Target cell
The to be switched edge termination answered switches to the corresponding Target cell of the to be switched edge termination, then judges the negative of this cell
Whether load value is also greater than the first overload threshold value, if it is, continuing to carry out load balancing to this cell.Simultaneously to this cell
After carrying out load balancing, the load information of this cell of real-time update and its adjacent cell.
After the step S104, if the load value of described cell is less than overload threshold value (in the embodiment of the present invention
For the second overload threshold value ξ2, can be the overload threshold value being empirically configured, can also be the load according to cell
The overload threshold value that degree is divided), then in setting time, suspend load balancing, and suspend described cell of receiving
The load balancing of adjacent area.One load balancing can be set and terminate timer, when the load value of this cell is less than the second overload threshold
When value, starting load equilibrium terminates timer, suspends this load balancing process, while can also suspend the load for receiving adjacent cell
Balancing requests, after load balancing terminates timer expired, this cell will allow the load balancing requests of adjacent cell again.Institute
Stating setting time can empirically be configured.
Above-described embodiment shows the measurement report reported by obtaining terminal；According to the measurement report, from the terminal
The middle to be switched edge termination of determination and its corresponding to be switched Target cell, then according to the load information of described cell and institute
The load information for stating to be switched Target cell determines the load balancing factors of the to be switched edge termination, according to the load
Balance factor determines the Target cell of the edge termination and switching that switch over from the to be switched edge termination, finally will
The corresponding to be switched edge termination of maximum load balance factor switches to the corresponding to be switched target of the to be switched edge termination
Cell can avoid the problem that the cell after switching is overloaded when carrying out load balancing.It is to be switched in the embodiment of the present invention
Include to be switched edge termination and its corresponding to be switched Target cell, load balancing factors in user list, indicates to be switched
Load balance degree of the edge termination in be switched Target cell, and can dynamically update the to be switched user list.It is logical
The size of overload balance factor value can preferably appropriate to be switched edge termination and appropriate to be switched Target cell,
Reach the less terminal of switching and can be obtained preferable load balancing effect, improves the execution efficiency of load balancing.
In order to preferably explain the present invention, Fig. 2 be the embodiment of the present invention under concrete application scene, loaded in mobile network
The implementation process of balanced method.
This cell is s in the embodiment of the present invention, and there are three adjacent cells, are j1, j2, j3.This cell s is in order to meet current institute
There is the required RB of terminal traffic rate requirement (Resource Block, resource block) number Ns=108.Adjacent cell j1, j2, j3
It is respectively N to meet all required RB numbers of terminal traffic rate requirement in cellj1=30, Nj2=91, Nj3=95.
It is respectively u1, u2, u3 and u4 that this cell s, which has 4 edge terminations,.If the resource block number that u1, u2, u3 and u4 are occupied is respectively
Nu1,s=4, Nu2,s=5, Nu3,s=10, Nu4,s=10.And assume the total Physical Resource Block number N of celltotal=100, it is four small
Area all has identical Physical Resource Block number.
Step S201 monitors cell load situation in real time.
Monitoring process is mainly that the measurement to data is analyzed, and is divided the load state of cell according to the data of measurement
Analysis, calculates the load value of cell.The calculating of load value is using the computational methods of dummy load value, the calculation formula of dummy load value
It is as follows：
ρ is the load value of cell, NtotalFor the total available Physical Resource Block number of cell, Nk,jIt is in j-th of cell
K terminal is the Physical Resource Block number for meeting its Service assurance rate and needing to occupy.According to 3GPP (3rd Generation
Partnership Project, third generation partner program) in TS36.213 technical standard, Nk,jIt can be according to terminal
The Service assurance rate of coded modulation grade and terminal is tabled look-up acquisition.This cell load value is at this time
Step S202, judges whether the load value ρ of cell is more than ξ1When, if yes then enter step S203, if otherwise
Return to step S201.
ξ1For an overload threshold value of cell setting.ξ1It can be set according to the loading level of cell, be more than 1 and indicate cell
ξ is arranged in overload, the embodiment of the present invention1It is 1, this cell s overloads at this time.
Step S203, this cell s send a load information interaction signaling by X2 interface to neighboring community, obtain adjacent
The load information of cell.It will be in the load information storage to " list of adjacent cell load information " of neighboring community.This cell s is obtained
The load information of adjacent cell j1, j2, j3.
The interaction of load information is divided into the load information interaction of preiodic type and event triggering type, information as mentioned above interaction
It is the information exchange of event triggering type.
The load information of cell can be：The load value of cell；The PRB of radio resource state uplink/downlink GBR traffic is utilized
Rate；Available load value (capacity that uplink/downlink can be used for load balancing accounts for the percentage of total capacity)；Pass through touching based on event
Hair load information reports.
Step S204 obtains UE and reports RSRP information, includes the RSRP values of the RSRP of place cell and adjacent cell.According to
The RSRP values of terminal choose edge termination, while determining the changeable Target cell of edge termination.
The terminal for meeting formula (1) is determined as edge termination, while determining Target cell j.When a terminal-pair answers two
When a cell or multiple cells meet formula (1) simultaneously, best target cell is therefrom selected according to load balancing factors.
SINRs-SINRj≤2HM0-HMsj………………………………………………(1)
SINRsIt is the Signal to Interference plus Noise Ratio of this cell s, unit dB；SINRjIndicate that the Signal to Interference plus Noise Ratio of Target cell j, unit are
dB；HM0Switch the initial value of offset, unit dB between cell；HMsjSwitch to Target cell for current service cell
Switch offset, unit dB.
If u3 is detected simultaneously by the signal of cell j2 and j3, and at the same time the case where meeting formula (1).At this point, this cell s
Its load balancing factors α about j2 and j3 is calculated separately to terminal u33, j2And α3, j3.If α3, j2≥α3, j3, then select j2 for
Otherwise Target cell selects j3 for Target cell.
The load information that adjacent cell is obtained from " list of adjacent cell load information " is small with this according to the load information of adjacent cell
The load state and terminal channel situation in area calculate the load balancing factors α of each edge termination.Following formula (2) can be used
It calculates：
Ni,sIndicate that this cell s is the required RB numbers of service rate demand for meeting i-th of switching terminal；NsIt indicates
This cell s is to meet current all required RB numbers of terminal traffic rate requirement；Ni,jIndicate that Target cell j is to meet i-th
A required RB numbers of switching terminal；NjIt is Target cell j fast to meet all terminal traffics in its cell at current time
The required RB numbers of rate demand.Wherein Ni,sAnd Ni,jIt can be tabled look-up acquisition according to 3GPP standards.The N of above formulas、NjCalculating it is public
Formula is as follows：
Ns, NjThe cumulative of all required resource blocks of terminal in this cell and Target cell is indicated respectively.Ms, MjRespectively
Indicate the sum of all terminals in this cell and Target cell.
The terminal for being suitble to switching, α are predicted according to α values<0 is considered being not suitable for switching terminal.To be switched end is predicted according to α values
End, generates to be switched user list, and be ranked up according to the size of α.In the terminal for being suitble to switching, priority bigger α
It is higher.
If the resource block number occupied after terminal switching is the same, both Nu3,s=Nu3,j2, terminal u3 is corresponding to the negative of cell j2
Carry balance factorTherefore the load of cell j2 can be caused small higher than this after terminal u3 switchings
Area s, therefore terminal u3 is identified as being not suitable for switching.Assuming that the corresponding Target cell of terminal u1, u2 and u4 is j1, then obviously
0<α1, j1<α2, j1<α4, j1, therefore the highest priority of terminal u4, terminal u4 is switched over first.It can by switching terminal u4
With the load of transfer 9.3%.If switching u1 only displaced 3.7% load.U1 and u2 are switched over simultaneously and also only shifted
8.3% load.Therefore the method for taking load balancing factors improves the efficiency of switching, switch less terminal reach compared with
Good unloading effect reduces terminal and switches the signaling overheads brought.
Step S205, when to be switched user list is empty, then it represents that cell is without to be switched terminal, load balancing process knot
Beam goes to step S208；Otherwise step S206 is gone to.
Step S206 selects the maximum terminal of α values to execute switching.I.e. this cell s preferentially switches over terminal u4.
Step S207, when the load value of this cell is less than a relatively low load-threshold value ξ2When, then go to step
Otherwise S208 goes to step S203 by step S209.Wherein, the ξ2It is to be divided according to the loading level of cell
, it is a relatively low load-threshold value, optional 0.8；ξ2<ξ1It can prevent frequent load balancing process.
Step S208 starts a load balancing and terminates timer T1, timing time t1.In t1This cell s is temporary in time
Stop the load balancing process of this cell and suspend the load balancing switching request for receiving neighboring community, prevents from excessively frequently loading
Balancing procedure and pingpang handoff.After timer T1 time-out, this cell s will allow the load balancing of its adjacent cell to ask again
It asks.
Step S209 after the completion of switching, is updated the load information of this cell, while also to the load of neighboring community
Information is updated.
Based on identical inventive concept, Fig. 3 shows that a kind of device of load balancing, the device can execute load balancing
Method flow, the device can be located at base station in, can also be the central control device independently of base station, as shown in figure 3,
The device includes：
Acquisition module 301, for when this cell load overloads, obtaining the measurement report that terminal reports；
First determining module 302, for according to the measurement report, determined from the terminal to be switched edge termination and
Its corresponding to be switched Target cell；
Second determining module 303, the load for load information and the to be switched Target cell according to this cell are believed
Breath, determines the load balancing factors of the to be switched edge termination, and the load balancing factors are for weighing described to be cut change sides
Edge terminal is switched to the load effect to described cell and the to be switched Target cell after the to be switched Target cell；
Handover module 304, for maximum to the load effect of described cell and the to be switched Target cell will bear
The corresponding to be switched edge termination of balance factor is carried, the corresponding to be switched Target cell of the to be switched edge termination is switched to.
Preferably, first determining module 302 is specifically used for：
Obtain the Reference Signal Received Power of this cell and its adjacent cell that terminal reports；
According to the Reference Signal Received Power of described cell and its adjacent cell, described cell and its adjacent cell are determined
Signal to Interference plus Noise Ratio；
The to be switched edge termination and its corresponding to be switched Target cell are determined according to following formula：
SINRs-SINRj≤2HM0-HMsj
Wherein, SINRsFor the Signal to Interference plus Noise Ratio of this cell, SINRjFor the Signal to Interference plus Noise Ratio of Target cell, HM0It is cut between cell
Change the initial value of offset, HMsjThe switching offset switched from this cell to be switched Target cell for be switched edge termination.
Preferably, second determining module 303, is specifically used for：
The load balancing factors of the to be switched edge termination are determined according to following formula：
Wherein, α is the load balancing factors of to be switched edge termination, Ni,jIt is satisfaction i-th for be switched Target cell j
The required resource block RB numbers of service rate of to be switched edge termination, NjIt is to meet in its cell for be switched Target cell j
The RB numbers of all terminal traffic rate requirements, Ni,sIt is the service rate need for meeting i-th of to be switched edge termination for this cell s
Ask required RB numbers, NsIt is the RB numbers for meeting all terminal traffic rate requirements in its cell for this cell s, i ＞ 0, s ＞ 0,
J ＞ 0.
Preferably, second determining module 303 is additionally operable to：
After the load balancing factors of the determination to be switched edge termination, by the to be switched edge termination,
To be switched Target cell and its corresponding load balancing factors are stored in be switched user list, and according to the load balancing factors
Size load balancing factors all in the to be switched user list are ranked up, choose to described cell and described
The corresponding to be switched edge termination of the maximum load balancing factors of load effect of to be switched Target cell and to be switched target are small
Area.
Preferably, the handover module 304 is additionally operable to：
The maximum load balancing factors of the load effect of described cell and the to be switched Target cell will corresponded to
To be switched edge termination, switch to after the corresponding to be switched Target cell of the to be switched edge termination, if described is small
The load value in area is less than overload threshold value, then in setting time, suspends load balancing, and suspend the neighbour for receiving described cell
The load balancing of cell.
In conclusion the measurement report reported by obtaining terminal；According to the measurement report, determined from the terminal
To be switched edge termination and its corresponding to be switched Target cell, then according to the load information of described cell and described to be cut
The load information for changing Target cell determines the load balancing factors of the to be switched edge termination, according to the load balance because
Son determines the Target cell of the edge termination and switching that switch over from the to be switched edge termination, finally that maximum is negative
The corresponding to be switched edge termination of balance factor is carried, the corresponding to be switched Target cell of the to be switched edge termination is switched to,
It can avoid the problem that the cell after switching is overloaded when carrying out load balancing.To be switched user in the embodiment of the present invention
Include to be switched edge termination and its corresponding to be switched Target cell, load balancing factors in list, indicates to be switched edge
Load balance degree of the terminal in be switched Target cell, and can dynamically update the to be switched user list.By negative
Carry balance factor value size can preferably appropriate to be switched edge termination and appropriate to be switched Target cell, reach
Less switching terminal and preferable load balancing effect, improve the execution efficiency of load balancing.
The present invention be with reference to according to the method for the embodiment of the present invention, the flow of equipment (system) and computer program product
Figure and/or block diagram describe.It should be understood that can be realized by computer program instructions every first-class in flowchart and/or the block diagram
The combination of flow and/or box in journey and/or box and flowchart and/or the block diagram.These computer programs can be provided
Instruct the processor of all-purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce
A raw machine so that the instruction executed by computer or the processor of other programmable data processing devices is generated for real
The device for the function of being specified in present one flow of flow chart or one box of multiple flows and/or block diagram or multiple boxes.
These computer program instructions, which may also be stored in, can guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works so that instruction generation stored in the computer readable memory includes referring to
Enable the manufacture of device, the command device realize in one flow of flow chart or multiple flows and/or one box of block diagram or
The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device so that count
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, in computer or
The instruction executed on other programmable devices is provided for realizing in one flow of flow chart or multiple flows and/or block diagram one
The step of function of being specified in a box or multiple boxes.
Although preferred embodiments of the present invention have been described, it is created once a person skilled in the art knows basic
Property concept, then additional changes and modifications may be made to these embodiments.So it includes excellent that the following claims are intended to be interpreted as
It selects embodiment and falls into all change and modification of the scope of the invention.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
God and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to include these modifications and variations.
Claims (8)
1. a kind of method of load balancing, which is characterized in that the method includes：
When this cell load overloads, the measurement report that terminal reports is obtained；
According to the measurement report, to be switched edge termination and its corresponding to be switched Target cell are determined from the terminal；
According to the load information of this cell and the load information of the to be switched Target cell, the to be switched edge termination is determined
Load balancing factors, the load balancing factors are switched to the to be switched target for weighing the to be switched edge termination
To the load effect of described cell and the to be switched Target cell after cell；
The maximum load balancing factors of load effect to described cell and the to be switched Target cell are corresponding to be cut
Edge termination is changed, the corresponding to be switched Target cell of the to be switched edge termination is switched to；
The load balancing factors of the to be switched edge termination are determined according to following formula：
Wherein, α is the load balancing factors of to be switched edge termination, Ni,jFor to be switched Target cell j be meet i-th it is to be cut
Change the required resource block RB numbers of service rate of edge termination, NjIt is to meet in its cell to own for be switched Target cell j
The RB numbers of terminal traffic rate requirement, Ni,sFor the service rate demand institute that this cell s is i-th of to be switched edge termination of satisfaction
The RB numbers needed, NsIt is the RB numbers for meeting all terminal traffic rate requirements in its cell, i ＞ 0, s ＞ 0, j ＞ for this cell s
0。
2. the method as described in claim 1, which is characterized in that according to the measurement report, determination is to be cut from the terminal
Edge termination and its corresponding to be switched Target cell are changed, including：
Obtain the Reference Signal Received Power of this cell and its adjacent cell that terminal reports；
According to the Reference Signal Received Power of described cell and its adjacent cell, determine that the letter of described cell and its adjacent cell is dry
It makes an uproar ratio；
To be switched edge termination and its corresponding to be switched Target cell are determined according to following formula：
SINRs-SINRj≤2HM0-HMsj
Wherein, SINRsFor the Signal to Interference plus Noise Ratio of this cell, SINRjFor the Signal to Interference plus Noise Ratio of Target cell, HM0Switch between cell inclined
The initial value of shifting amount, HMsjThe switching offset switched from this cell to be switched Target cell for be switched edge termination.
3. such as claim 1 to 2 any one of them method, which is characterized in that in the determination to be switched edge termination
Load balancing factors after, further include：
The to be switched edge termination, to be switched Target cell and its corresponding load balancing factors are stored in be switched user's row
Table, and load balancing factors all in the to be switched user list are arranged according to the size of the load balancing factors
Sequence is chosen corresponding to be cut to the maximum load balancing factors of load effect of described cell and the to be switched Target cell
Change edge termination and to be switched Target cell.
4. the method as described in claim 1, which is characterized in that will be to described cell and the to be switched Target cell
The corresponding to be switched edge termination of the maximum load balancing factors of load effect, it is corresponding to switch to the to be switched edge termination
After to be switched Target cell, further include：
If the load value of described cell is less than overload threshold value, in setting time, suspend load balancing, and suspend receiving
The load balancing of the adjacent cell of described cell.
5. a kind of device of load balancing, which is characterized in that including：
Acquisition module, for when this cell load overloads, obtaining the measurement report that terminal reports；
First determining module, for according to the measurement report, to be switched edge termination and its correspondence to be determined from the terminal
To be switched Target cell；
Second determining module, for according to the load information of this cell and the load information of the to be switched Target cell, determining
The load balancing factors of the to be switched edge termination, the load balancing factors are cut for weighing the to be switched edge termination
Change to the load effect to described cell and the to be switched Target cell after the to be switched Target cell；
Handover module, for will to the maximum load balance of load effect of described cell and the to be switched Target cell because
The corresponding to be switched edge termination of son, switches to the corresponding to be switched Target cell of the to be switched edge termination；
Second determining module, is specifically used for：
The load balancing factors of the to be switched edge termination are determined according to following formula：
Wherein, α is the load balancing factors of to be switched edge termination, Ni,jFor to be switched Target cell j be meet i-th it is to be cut
Change the required resource block RB numbers of service rate of edge termination, NjIt is to meet in its cell to own for be switched Target cell j
The RB numbers of terminal traffic rate requirement, Ni,sFor the service rate demand institute that this cell s is i-th of to be switched edge termination of satisfaction
The RB numbers needed, NsIt is the RB numbers for meeting all terminal traffic rate requirements in its cell, i ＞ 0, s ＞ 0, j ＞ for this cell s
0。
6. device as claimed in claim 5, which is characterized in that first determining module is specifically used for：
Obtain the Reference Signal Received Power of this cell and its adjacent cell that terminal reports；
According to the Reference Signal Received Power of described cell and its adjacent cell, determine that the letter of described cell and its adjacent cell is dry
It makes an uproar ratio；
The to be switched edge termination and its corresponding to be switched Target cell are determined according to following formula：
SINRs-SINRj≤2HM0-HMsj
Wherein, SINRsFor the Signal to Interference plus Noise Ratio of this cell, SINRjFor the Signal to Interference plus Noise Ratio of Target cell, HM0Switch between cell inclined
The initial value of shifting amount, HMsjThe switching offset switched from this cell to be switched Target cell for be switched edge termination.
7. such as claim 5 to 6 any one of them device, which is characterized in that second determining module is additionally operable to：
After the load balancing factors of the determination to be switched edge termination, by the to be switched edge termination, to be cut
It changes Target cell and its corresponding load balancing factors is stored in be switched user list, and according to the big of the load balancing factors
It is small that load balancing factors all in the to be switched user list are ranked up, it chooses to described cell and described to be cut
Change the corresponding to be switched edge termination of the maximum load balancing factors of load effect of Target cell and to be switched Target cell.
8. device as claimed in claim 5, which is characterized in that the handover module is additionally operable to：
It is waiting for the maximum load balancing factors of load effect to described cell and the to be switched Target cell are corresponding
Toggle edges terminal switches to after the corresponding to be switched Target cell of the to be switched edge termination, if described cell
Load value is less than overload threshold value, then in setting time, suspends load balancing, and suspend the adjacent cell for receiving described cell
Load balancing.
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| CN105163351B (en) * | 2015-10-21 | 2018-09-18 | 重庆邮电大学 | Multiple cell resource allocation methods based on efficiency in a kind of LTE system |
| CN106912071B (en) * | 2015-12-22 | 2020-08-04 | 中国移动通信集团广东有限公司 | Method and device for triggering load balancing based on L TE relative load difference |
| US20170272305A1 (en) * | 2016-03-16 | 2017-09-21 | Pc-Tel, Inc. | Systems and methods for cellular network anomaly detection using spatially aggregated data |
| CN110784894B (en) * | 2018-07-31 | 2023-04-07 | 中国移动通信集团山东有限公司 | LTE system load balancing method and device |
| 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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