CN104168577B - A kind of the whole network LTE cells PCI method and device for planning - Google Patents
A kind of the whole network LTE cells PCI method and device for planning Download PDFInfo
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Abstract
The present invention is applied to LTE network technical field, there is provided a kind of the whole network LTE cells PCI method and device for planning, methods described include：Initialization planning is carried out to the whole network PCI；Build the whole network interference matrix；Fitness function value is calculated according to the interference matrix, and judges whether to meet the condition of convergence；When meeting the condition of convergence, the whole network PCI planning now is exported；When being unsatisfactory for the condition of convergence, intersection is performed, mutation operation carries out weight-normality and drawn.The present invention provides a kind of the whole network LTE cells PCI method and device for planning based on genetic algorithm, planned first with initialization the whole network PCI is produced, establish interference matrix, annoyance level is assessed by calculating fitness function value, decide whether to intersect population again, mutation operation, until output optimum programming, to help network optimization personnel fast and accurately to plan the whole network LTE cell PCI, so as to improve the operating efficiency of network optimization personnel.
Description
Technical field
The invention belongs to LTE network technical field, more particularly to a kind of the whole network LTE cells PCI method and device for planning.
Background technology
In LTE system, base station can be with the PCI of some cell of self-configuring, and according to agreement TS 36.300, LTE
504 PCI (Physical Layer Cell ID, physics defined in (LongTerm Evolution, Long Term Evolution) system
Layer cell identifiers) numerical value (0 to 503), so, necessarily have different cells use identical PCI situation.If use phase
It is also identical with PCI two center of housing estate frequencies, then it can cause serious inter-cell interference.Therefore, cell PCI is automatically configured
Have to meet the requirement that PCI does not conflict and do not obscured.Wherein PCI, which does not conflict, to be referred to the adjacent co-frequency cell of any two and all can not
Use same PCI；PCI does not obscure finger can not have any two co-frequency cell using identical in all adjacent areas of a cell
PCI.
, it is necessary to ensure that some cell of adjacent base station and some cell of this base station have neighbour in existing PCI collision detection methods
During cell relation, the cell of adjacent base station can not have PCI conflicts with all same frequency service cells in this base station.But for
For Large Copacity BBU (Building Base band Unit, indoor baseband processing unit), it is entirely possible to exist one small
The frequency and PCI in area are identical with the frequency of the adjacent area of another cell and PCI in the station.In addition, existing PCI collision detection sides
Method is likely to occur the situation of user equipment (UE) flase drop.Based on these problems, under existing solution artificial deallocation put PCI will
Cause follow-up UE do the process such as switch when it is possible that the situation of handoff failure, it is impossible to ensure the correct operation of network.
The content of the invention
In view of the above problems, it is an object of the invention to provide a kind of the whole network LTE cells PCI method and device for planning,
Aim to solve the problem that the technical problem that PCI can not be avoided to conflict in existing LTE network.
On the one hand, the planing method of the whole network LTE cells PCI comprises the steps：
Initialization planning is carried out to the whole network PCI；
Build the whole network interference matrix；
Fitness function value is calculated according to the interference matrix, and judges whether to meet the condition of convergence；
When meeting the condition of convergence, the whole network PCI planning now is exported；
When being unsatisfactory for the condition of convergence, intersection is performed, mutation operation carries out weight-normality and drawn.
Preferably, it is described that initialization planning step is carried out to the whole network PCI, specifically include：
The whole network cell is arranged according to longitude and latitude；
Then it is that each cell distributes PCI according to Plan Rule.
Preferably, structure the whole network interference matrix step, is specifically included：
Calculate the interference coefficient between cell and cell；
The whole network interference matrix is established by interference coefficient.
Preferably, the interference coefficient step calculated between cell and cell, is specifically included：
Determine the coverage of each cell；
Two MPS process overlapping areas are calculated, the interference coefficient of two cells is assessed by overlapping area.
Preferably, fitness function interference coefficient sum between all cells, fitness function value illustrate entirely
Net annoyance level, when fitness function value is 0, meet the condition of convergence.
On the other hand, the device for planning of the whole network LTE cells PCI, including：
First planning module, for carrying out initialization planning to the whole network PCI；
Matrix establishes module, for building the whole network interference matrix；
Judge module is restrained, for calculating fitness function value according to the interference matrix, and judges whether to meet convergence
Condition；
Output module is planned, for when meeting the condition of convergence, exporting the whole network PCI planning now；
Weight planning module, for when being unsatisfactory for the condition of convergence, performing intersection, mutation operation carries out weight-normality stroke.
Preferably, the just planning module includes：
Cell arrangement units, for the whole network cell to be arranged according to longitude and latitude；
PCI allocation units, for being that each cell distributes PCI according to Plan Rule.
Preferably, the matrix is established module and included：
Interference coefficient computing unit, for calculating the interference coefficient between cell and cell；
Interference matrix establishes unit, for establishing the whole network interference matrix by interference coefficient.
Preferably, the interference coefficient computing unit includes：
Scope determines component, for determining the coverage of each cell；
Interference coefficient determines component, and for calculating two MPS process overlapping areas, two are assessed by overlapping area
The interference coefficient of cell.
Preferably, fitness function interference coefficient sum between all cells, fitness function value illustrate entirely
Net annoyance level, when fitness function value is 0, the convergence judge module judges to meet the condition of convergence.
The beneficial effects of the invention are as follows：The present invention provides a kind of the whole network LTE cells PCI planning side based on genetic algorithm
Method and device, the PCI planning of initialization the whole network is produced with genetic algorithm first, join in conjunction with existing network work and plan that PCI establishes interference
Matrix, PCI annoyance levels are assessed then in conjunction with interference matrix, judges whether fitness function restrains, according to result, decides whether
Population is intersected again, mutation operation, until being optimal the whole network PCI planning, to help network optimization personnel quickly accurate
True planning the whole network LTE cell PCI, so as to improve the operating efficiency of network optimization personnel, it is possible to prevente effectively from PCI conflicts and subtracted
Interference between few reference signal.
Brief description of the drawings
Fig. 1 is the flow chart of the planing method for the whole network LTE cells PCI that first embodiment of the invention provides；
Fig. 2 is two MPS process schematic diagrames；
Fig. 3 is that overlapping coverage rate calculates schematic diagram；
Fig. 4 is the block diagram of the device for planning for the whole network LTE cells PCI that second embodiment of the invention provides.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
In order to illustrate technical solutions according to the invention, illustrated below by specific embodiment.
Embodiment one：
Fig. 1 shows the flow of the whole network LTE cells PCI provided in an embodiment of the present invention planing method, for the ease of saying
It is bright to illustrate only the part related to the embodiment of the present invention.
The planing method for the whole network LTE cells PCI that the present embodiment provides comprises the steps：
Step S101, initialization planning is carried out to the whole network PCI.
Firstly the need of input basic data engineering parameter table, cell is sorted out by base station according to the engineering parameter table of input, then
The whole network cell is arranged according to longitude and latitude, is then that each cell distributes PCI according to Plan Rule.
In distribution, three cell PCI on same base station should be planned in order, if some base station only has two
Sector, one of those or two PCI need to be lost.If all basic station over network number is more than 504, then it is identical necessarily to have a cell PCI,
It at this time should be ensured that PCI identical cells are remote enough.If less than 504, then in the absence of PCI identical situations.For room
Point cell, plans a PCI, but can not be adjacent thereto face direction on base station PCI moulds 3 it is equal；Adjacent base station is (spatially
It is adjacent, i.e., longitude and latitude is adjacent) and coverage direction it is identical (i.e. diagonally opposed within 60 degree, it is necessary to judge with reference to longitude and latitude)
The PCI moulds 3 of two sectors can not be equal；If covering section identical situation is not present in adjacent base station, now PCI can be any
Planning.
Step S102, the whole network interference matrix is built.
, it is necessary to judge the initial population after initialization PCI planning generations finish, determine whether to meet finally
PCI plans demand, if it is satisfied, algorithm terminates, output result, if be unsatisfactory for, carries out mutation operation, optimization to population again
Upgrading.In order to realize this purpose, need to build the whole network interference matrix in this step.
Firstly the need of the interference coefficient calculated between cell and cell, here by determining the coverage of each cell,
Then two small area overlapping area coverage is directly calculated to determine interference coefficient.
In the lte networks, PCI disturbs key factor to have：Mould 3 it is equal interference, mould 6 it is equal interference, mould 12 it is equal interference, it is small
The interference of area covering area overlapping, distance interference, usual mould 12 disturb more serious than the annoyance level of mould 6, and mould 6 disturbs to be disturbed sternly than mould 3
Weight.Interference coefficient between cell and cell is calculated as follows：
Assuming that the angle of coverage of single subdistrict is 120 degree, effective coverage distance is 500 meters (parameter can configure), in GIS
Can be drawn in (Geographic Information System, GIS-Geographic Information System) cell coverage diagram (here in order to
It is easy to calculate, it will be assumed that MPS process figure is triangle), the overlapping area of two MPS process figures is then calculated, passes through weight
Folded area assesses the overlapping coverage rate of two cells, i.e. interference coefficient.There are two cells of cell A and cell B in Fig. 2, between
Overlay region be present.Overlapping area is calculated using calculus, then calculates overlapping coverage rate.
Overlapping coverage rate as shown in Figure 3 calculates schematic diagram, first, X is evenly dividing out on the fan-shaped arc of cell A coverings
Individual point (such as D, E ...), X are more than or equal to 10, and value is bigger, and the result of analysis is more accurate, but efficiency can be lower；By X point
Respectively with cell A summit A structure straightway (AB, AD, AE, AF ...), uniformly taken on these straightways Y point (B1,
B2, B3 ...), preferred Y values 50, value is bigger, and analysis result is more accurate；So, will be just divided into altogether in cell coverage area
X*Y point, is calculated as Z；This Z point is traveled through respectively, sees whether it falls the coverage in cell B, if it is, two cells
Overlapping covering points cumulative 1, after the completion of traversal, all cumulative points are calculated as K；Calculating small area overlapping coverage coefficient P=K/Z, P can
To weigh the annoyance level of two cells.After the interference coefficient (overlapping coverage coefficient) being calculated between cell, you can
The whole network interference matrix is generated, it is as shown in the table：
Step S103, fitness function value is calculated according to the interference matrix, and judges whether to meet the condition of convergence.
Fitness function directs the direction of genetic algorithm evolution, with the change of the value of fitness function, genetic algorithm
Convergence or diverging.Think algorithmic statement when the value of fitness function is 0, obtain optimal solution.Fitness function value is smaller, this
When algorithm result it is more outstanding.
After interference matrix is used for genetic algorithm, fitness function is exactly the sum disturbed between all cells in fact.If deposit
In M cell, fitness function such as following formula：
Interference coefficients of the wherein interf (Ai, Bj) between cell A and B.With the evolution of algorithm, in every generation
Body can all carry out fitness calculating, know from experience for each and obtain a corresponding sumInterf, and it is worth smaller explanation individual and represented
The interference of allocative decision issuable the whole network it is smaller.SumInterf worth reduction instructs algorithm to tend to restrain.When appearance
Illustrate algorithmic statement during sumInterf=0 individual, obtain a globally optimal solution, illustrate that the individual allocative decision will not
Produce interference.
Step S104, when meeting the condition of convergence, the whole network PCI planning now is exported.
When meeting the condition of convergence, i.e., when there is sumInterf=0 individual, export the whole network PCI rule now
Draw, this is planned to optimal PCI planning.
Step S105, when being unsatisfactory for the condition of convergence, intersection is performed, mutation operation carries out weight-normality and drawn.
If be unsatisfactory for the condition of convergence, and when planning now is not optimum programming, it is necessary to according to genetic algorithm perform intersection,
Carry out weight-normality after mutation operation to draw, the principle planned again is more than small where the cell to impose a condition to those interference coefficients
Area's cluster is planned again.After weight-normality is drawn, continue the population after being completed to planning and carry out Fitness analysis, that is, calculate and adapt to
Functional value is spent, and judges whether to meet the condition of convergence, if it is satisfied, algorithm terminates, is unsatisfactory for, is planned again, until defeated
Untill going out optimum programming, specifically, optimum programming result can be presented by GIS, can also be in by exporting excel forms
It is existing.
Embodiment two：
Fig. 4 shows the structure of the whole network LTE cells PCI provided in an embodiment of the present invention device for planning, for the ease of saying
It is bright to illustrate only the part related to the embodiment of the present invention.
The device for planning for the whole network LTE cells PCI that the present embodiment provides includes：
First planning module 41, for carrying out initialization planning to the whole network PCI；
Matrix establishes module 42, for building the whole network interference matrix；
Judge module 43 is restrained, for calculating fitness function value according to the interference matrix, and judges whether to meet to receive
Hold back condition；
Output module 44 is planned, for when meeting the condition of convergence, exporting the whole network PCI planning now；
Weight planning module 45, for when being unsatisfactory for the condition of convergence, performing intersection, mutation operation carries out weight-normality stroke.
In the present embodiment, above-mentioned functional module 41-45 corresponds to the step S101-S105 realized in embodiment one respectively,
Specifically, carrying out PCI initialization planning by first planning module 41 first, then matrix establishes module 42 and establishes the whole network interference square
Battle array, convergence judge module 43 judges whether fitness function restrains according to the interference matrix, when meeting the condition of convergence, planning
Output module 44 exports the whole network PCI planning now, and otherwise weight planning module 45 carries out weight-normality stroke, until exporting optimal PCI rule
Draw.
During specific implementation, the just planning module 41 includes：
Cell arrangement units, for the whole network cell to be arranged according to longitude and latitude；
PCI allocation units, for being that each cell distributes PCI according to Plan Rule.
The matrix, which establishes module 42, to be included：
Interference coefficient computing unit, for calculating the interference coefficient between cell and cell；
Interference matrix establishes unit, for establishing the whole network interference matrix by interference coefficient.
Wherein, the interference coefficient computing unit includes：
Scope determines component, for determining the coverage of each cell；
Interference coefficient determines component, and for calculating two MPS process overlapping areas, two are assessed by overlapping area
The interference coefficient of cell.
To sum up, the embodiment of the present invention provides a kind of the whole network LTE cells PCI planing method and dress based on genetic algorithm
Put, first with the PCI planning of initialization the whole network is produced, join in conjunction with existing network work and plan that PCI establishes interference matrix, PCI is done
The degree of disturbing is assessed, and according to the assessment result of interference matrix, decides whether to intersect population again, mutation operation, directly
It is excellent so as to improve network to help network optimization personnel fast and accurately to plan the whole network LTE cells PCI to output optimum programming
The operating efficiency of change personnel.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
All any modification, equivalent and improvement made within refreshing and principle etc., should be included in the scope of the protection.
Claims (4)
1. a kind of the whole network LTE cells PCI planing method, it is characterised in that methods described includes：
Initialization planning is carried out to the whole network PCI；
Build the whole network interference matrix；
Fitness function value is calculated according to the interference matrix, and judges whether to meet the condition of convergence；
When meeting the condition of convergence, the whole network PCI planning now is exported；
When being unsatisfactory for the condition of convergence, intersection is performed, mutation operation carries out weight-normality and drawn；
Wherein, it is described that initialization planning step is carried out to the whole network PCI, specifically include：
The whole network cell is arranged according to longitude and latitude；
Then it is that each cell distributes PCI according to Plan Rule, allocation rule is here：Three cells on same base station
PCI is planned in order, if some base station only has two sectors, need to lose one of those or two PCI；If all basic station over network
Number is more than 504, then it is identical necessarily to have a cell PCI, at this time should be ensured that PCI identical cells are remote enough；If less than
504, then in the absence of PCI identical situations；Divide cell for room, plan a PCI, but can not be adjacent thereto face direction
On base station PCI moulds 3 it is equal；The PCI moulds 3 of two sectors of adjacent base station and coverage direction identical can not be equal；If adjacent base
Stand in the absence of section identical situation is covered, now PCI can be planned arbitrarily；
Wherein, structure the whole network interference matrix step, is specifically included：
The interference coefficient between cell and cell is calculated, specifically, it is first determined the coverage of each cell, then calculate
Two MPS process overlapping areas, the interference coefficient of two cells is assessed by overlapping area；Here for therein any
Two cells A and B, first, X point is evenly dividing out on the fan-shaped arc of cell A coverings, X is more than or equal to 10；By X point
The summit with cell A builds straightway respectively, and Y point is uniformly taken on these straightways；So, just by cell coverage area
It is divided into altogether for X*Y point, is calculated as Z, travel through this Z point respectively, sees whether it falls the coverage in cell B, if
It is two small area overlapping covering points cumulative 1, after the completion of traversal, all cumulative points are calculated as K；Calculate small area overlapping covering system
Number P=K/Z, P can weigh the annoyance level of two cells, as interference coefficients of the cell B to cell A；
The whole network interference matrix is established by interference coefficient.
2. method as claimed in claim 1, it is characterised in that the fitness function value between all cells interference coefficient it
With, fitness function value illustrates the whole network annoyance level, when fitness function value be 0 when, meet the condition of convergence.
3. a kind of the whole network LTE cells PCI device for planning, it is characterised in that described device includes：
First planning module, for carrying out initialization planning to the whole network PCI；
Matrix establishes module, for building the whole network interference matrix；
Judge module is restrained, for calculating fitness function value according to the interference matrix, and judges whether to meet the condition of convergence；
Output module is planned, for when meeting the condition of convergence, exporting the whole network PCI planning now；
Weight planning module, for when being unsatisfactory for the condition of convergence, performing intersection, mutation operation carries out weight-normality stroke；
Wherein, the just planning module includes：
Cell arrangement units, for the whole network cell to be arranged according to longitude and latitude；
PCI allocation units, for being that each cell distributes PCI according to Plan Rule, allocation rule is here：On same base station
Three cell PCI plan in order, if some base station only has two sectors, one of those or two PCI need to be lost；Such as
Fruit all basic station over network number is more than 504, then it is identical necessarily to have a cell PCI, at this time should be ensured that PCI identical cells are enough
Far；If less than 504, then in the absence of PCI identical situations；Divide cell for room, plan a PCI, but can not be with its phase
Base station PCI moulds 3 on adjacent face direction are equal；The PCI moulds 3 of two sectors of adjacent base station and coverage direction identical can not phase
Deng；If covering section identical situation is not present in adjacent base station, now PCI can be planned arbitrarily；
Wherein, the matrix is established module and included：
Interference coefficient computing unit, for calculating the interference coefficient between cell and cell；Specifically, it is first determined each cell
Coverage, then calculate two MPS process overlapping areas, the interference systems of two cells assessed by overlapping area
Number；Here for any two cell A and B therein, first, X point, X are evenly dividing out on the fan-shaped arc of cell A coverings
More than or equal to 10；Summit of the X point respectively with cell A is built into straightway, Y point is uniformly taken on these straightways；This
Sample, it just will be altogether divided into cell coverage area for X*Y point, be calculated as Z, traveled through this Z point respectively, see whether it falls
Cell B coverage, if it is, two small area overlapping covering points cumulative 1, after the completion of traversal, all cumulative points are calculated as
K；The annoyance level of two cells can be weighed by calculating small area overlapping coverage coefficient P=K/Z, P, and as cell B is done to cell A
Disturb coefficient；
Interference matrix establishes unit, for establishing the whole network interference matrix by interference coefficient.
4. device as claimed in claim 3, it is characterised in that the fitness function value between all cells interference coefficient it
With fitness function value illustrates the whole network annoyance level, and when fitness function value is 0, the convergence judge module judges full
The sufficient condition of convergence.
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| CN105744548B (en) * | 2014-12-12 | 2020-02-07 | 中国移动通信集团湖北有限公司 | PCI optimization method and device |
| CN105472664B (en) * | 2015-11-19 | 2018-11-09 | 南京航空航天大学 | A kind of anti-interference decision-making technique of wireless communication system based on reduction rules |
| CN105516992B (en) * | 2015-12-14 | 2018-12-14 | 中通服建设有限公司 | A kind of PCI planing method of LTE network |
| CN107124727B (en) * | 2016-02-24 | 2020-05-12 | 中国移动通信集团福建有限公司 | PCI optimization method and device |
| CN107182062A (en) * | 2016-03-11 | 2017-09-19 | 中国移动通信集团广东有限公司 | Physical area optimization method and device in LTE network |
| CN105764069B (en) * | 2016-04-11 | 2019-05-03 | 长讯通信服务有限公司 | A kind of LTE network PCI planning Multipurpose Optimal Method |
| CN107438264B (en) * | 2016-05-25 | 2021-07-20 | 中国移动通信集团广东有限公司 | Cell performance analysis method and device |
| CN108810880B (en) * | 2017-05-05 | 2020-07-10 | 中国移动通信集团公司 | Planning method and device for physical cell identifier |
| CN109561436B (en) * | 2017-09-26 | 2021-04-30 | 中国移动通信集团公司 | Physical layer cell identity (PCI) optimization method, equipment, computer readable storage medium and device |
| CN108156611A (en) * | 2018-03-23 | 2018-06-12 | 上海东洲罗顿通信股份有限公司 | A kind of new PCI planning and the method for coverage optimization |
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