CN104168577A - Whole-network LTE cell PCI planning method and device - Google Patents
Whole-network LTE cell PCI planning method and device Download PDFInfo
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- CN104168577A CN104168577A CN201410384673.1A CN201410384673A CN104168577A CN 104168577 A CN104168577 A CN 104168577A CN 201410384673 A CN201410384673 A CN 201410384673A CN 104168577 A CN104168577 A CN 104168577A
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Abstract
The invention relates to the technical field of LTE networks and provides a whole-network LTE cell PCI planning method and device. The method includes the steps of planning the whole-network PCI initially, building a whole-network interference matrix, calculating an adaptability function value according to the interference matrix, judging whether the adaptability function value meets the condition of convergence or not, outputting the current whole-network PCI plan when the adaptability function value meets the condition of convergence, and carrying out crossing and variation for replanning when the adaptability function value does not meet the condition of convergence. The whole-network LTE cell PCI planning method and device are provided on the basis of a genetic algorithm. The interference matrix is built through the initialized whole-network PCI plan at first, the interference degree is evaluated by calculating the adaptability function value, whether crossing and variation are carried out on species again or not is determined until the optimal plane is output, network optimization personnel can be helped to plan the whole-network LTE cell PCI rapidly and accurately, and therefore the working efficiency of the network optimization personnel is improved.
Description
Technical field
The invention belongs to LTE networking technology area, relate in particular to planing method and the device of a kind of the whole network LTE community PCI.
Background technology
In LTE system, base station can certain community of self-configuring PCI, and according to agreement TS 36.300, LTE (LongTerm Evolution, Long Term Evolution) define 504 PCI (Physical Layer Cell ID in system, physical-layer cell identifier) numerical value (0 to 503), like this, must have different communities and use the situation of identical PCI.If use two center of housing estate frequencies of identical PCI also identical, can cause serious presence of intercell interference.Therefore, the automatic configuration of community PCI must meet the requirement that PCI does not conflict and do not obscure.Wherein PCI does not conflict and refers to that any two adjacent co-frequency cells all can not be used same PCI; PCI does not obscure in all adjacent areas that refer to Yi Ge community can not have any two co-frequency cells to use identical PCI.
In existing PCI collision detection method, need to ensure that certain certain community, He Zhe base station, community, adjacent base station exists neighboring BS relationship time, Gai community, adjacent base station can not with this base station in all same frequency services community there is PCI conflict.But, for large capacity BBU (Building Base band Unit, indoor baseband processing unit), completely likely exist the frequency of Yi Ge community identical with frequency and the PCI of the adjacent area of another one community in this station with PCI.In addition may there is the situation of user equipment (UE) flase drop in existing PCI collision detection method.Based on these problems, under existing solution, artificial configure PCI will cause follow-up UE doing the situation that may occur handoff failure while the process such as switching, can not ensure the true(-)running of network.
Summary of the invention
In view of the above problems, the object of the present invention is to provide planing method and the device of a kind of the whole network LTE community PCI, be intended to solve the technical problem that cannot avoid PCI conflict in existing LTE network.
On the one hand, the planing method of described the whole network LTE community PCI comprises the steps:
The whole network PCI is carried out to initialization planning;
Build the whole network interference matrix;
Calculate fitness function value according to described interference matrix, and judge whether to meet the condition of convergence;
In the time meeting the condition of convergence, output the whole network PCI planning now;
In the time not meeting the condition of convergence, execution intersects, mutation operation carries out weight-normality and draws.
Preferably, described the whole network PCI is carried out to initialization planning step, specifically comprises:
The whole network community is arranged according to longitude and latitude;
Then be each cell allocation PCI according to Plan Rule.
Preferably, described structure the whole network interference matrix step, specifically comprises:
Interference coefficient between calculation plot and community;
Set up the whole network interference matrix by interference coefficient.
Preferably, the interference coefficient step between described calculation plot and community, specifically comprises:
Determine the coverage of each community;
Calculate Liang Ge community and cover overlapping area, assess the interference coefficient of Liang Ge community by overlapping area.
Preferably, described fitness function is interference coefficient sum between all communities, fitness function value representation the whole network annoyance level, in the time that fitness function value is 0, meet the condition of convergence.
On the other hand, the device for planning of described the whole network LTE community PCI, comprising:
Just planning module, for carrying out initialization planning to the whole network PCI;
Matrix is set up module, for building the whole network interference matrix;
Convergence judge module, for calculating fitness function value according to described interference matrix, and judges whether to meet the condition of convergence;
Planning output module, in the time meeting the condition of convergence, output the whole network PCI planning now;
Heavy planning module, in the time not meeting the condition of convergence, execution intersects, mutation operation carries out weight-normality and draws.
Preferably, described just planning module comprises:
Community arrangement units, for arranging the whole network community according to longitude and latitude;
PCI allocation units, for being each cell allocation PCI according to Plan Rule.
Preferably, described matrix is set up module and is comprised:
Interference coefficient computing unit, for the interference coefficient between calculation plot and community;
Interference matrix is set up unit, for set up the whole network interference matrix by interference coefficient.
Preferably, described interference coefficient computing unit comprises:
Scope is determined assembly, for determining the coverage of each community;
Interference coefficient is determined assembly, covers overlapping area for calculating Liang Ge community, assesses the interference coefficient of Liang Ge community by overlapping area.
Preferably, described fitness function is interference coefficient sum between all communities, fitness function value representation the whole network annoyance level, in the time that fitness function value is 0, the judgement of described convergence judge module meets the condition of convergence.
The invention has the beneficial effects as follows: the present invention is based on genetic algorithm provides planing method and the device of a kind of the whole network LTE community PCI, first produce initialization the whole network PCI planning by genetic algorithm, set up interference matrix in conjunction with existing network work ginseng and planning PCI again, then in conjunction with interference matrix assessment PCI annoyance level, judge whether fitness function restrains, according to result, determine whether population is intersected again, mutation operation, until reach optimum the whole network PCI planning, to help network optimization personnel to plan fast and accurately the whole network LTE community PCI, thereby improve network optimization personnel's operating efficiency, can effectively avoid PCI to conflict and reduce the interference between reference signal.
Brief description of the drawings
Fig. 1 is the flow chart of the planing method of the whole network LTE community PCI of providing of first embodiment of the invention;
Tu2Shi Liangge community covers schematic diagram;
Fig. 3 is that overlapping coverage rate is calculated schematic diagram;
Fig. 4 is the block diagram of the device for planning of the whole network LTE community PCI of providing of second embodiment of the invention.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
For technical solutions according to the invention are described, describe below by specific embodiment.
embodiment mono-:
Fig. 1 shows the flow process of the planing method of the whole network LTE community PCI that the embodiment of the present invention provides, only shows for convenience of explanation the part relevant to the embodiment of the present invention.
The planing method of the whole network LTE community PCI that the present embodiment provides comprises the steps:
Step S101, the whole network PCI is carried out to initialization planning.
First needing to input basic data engineering parameter table, according to the engineering parameter table of input, community is sorted out by base station, then the whole network community is arranged according to longitude and latitude, is then each cell allocation PCI according to Plan Rule.
In a point timing, on same base station, San Ge community PCI should plan in order, if certain base station only has two sectors, need lose one of them or two PCI.If all basic station over network number is greater than 504, must have so community PCI identical, at this time should ensure that the community that PCI is identical is enough far away.If be less than 504, there is not so the situation that PCI is identical.For Shi Fen community, plan a PCI, but the positive the other side that can not be adjacent base station PCI mould 3 upwards equates; The PCI mould 3 of two sectors of adjacent base station (on space adjacent, longitude and latitude is adjacent) and coverage direction identical (to angular direction in 60 degree, need to judge in conjunction with longitude and latitude) can not equate; Cover the identical situation in section if adjacent base station does not exist, now PCI can plan arbitrarily.
Step S102, structure the whole network interference matrix.
After initialization PCI planning generation is complete, need to judge this initial population, determine whether and meet final PCI planning demand, if met, algorithm finishes, and Output rusults, if do not met, carries out mutation operation, optimization and upgrading to population again.In order to realize this object, in this step, need to build the whole network interference matrix.
First need the interference coefficient between calculation plot and community, by determining the coverage of each community, then directly calculate the overlapping area coverage in Liang Ge community and determine interference coefficient here.
In LTE network, PCI disturbs key factor to have: mould 3 equates that interference, mould 6 equate that interference, mould 12 equate interference, the overlapping interference of cell coverage area, distance interference, and mould 12 interference ratio mould 6 annoyance levels are serious conventionally, mould 6 interference ratio mould 3 serious interference.Interference coefficient between community and community is calculated as follows:
The angle of coverage of supposing single subdistrict is 120 degree, effectively coverage distance is 500 meters (this parameter is configurable), at GIS (Geographic Information System, GIS-Geographic Information System) on can draw this community coverage diagram (here for the ease of calculate, we suppose that community coverage diagram is triangle), then calculate the overlapping area of Liang Ge community coverage diagram, assess the overlapping coverage rate of Liang Ge community by overlapping area, i.e. interference coefficient.Tu2Zhong You community A and B Liang Ge community, community, between there is overlay region.Utilize calculus to calculate overlapping area, then calculate overlapping coverage rate.
Overlapping coverage rate is as shown in Figure 3 calculated schematic diagram, first, covers on fan-shaped arc and evenly marks off X point (as D, E at community A ...), X is more than or equal to 10, is worth greatlyr, and the result of analysis is more accurate, but efficiency can be lower; X point built to straightway (AB, AD, AE, AF with the summit A of community A respectively ...), on these straightways, evenly get Y point (B1, B2, B3 ...), preferably Y value 50, is worth greatlyr, and analysis result is more accurate; Like this, just, by being divided into altogether in cell coverage area for X*Y point, count Z; Travel through respectively this Z point, see whether it has dropped on the coverage of community B, if so, the overlapping covering in Liang Ge community is counted and is added up 1, and after having traveled through, all cumulative counting are counted K; The overlapping coverage coefficient P=K/Z of calculation plot, P can weigh the annoyance level of Liang Ge community.Calculating interference coefficient (overlapping coverage coefficient) between community afterwards, can generate the whole network interference matrix, as shown in the table:
Step S103, calculate fitness function value according to described interference matrix, and judge whether to meet the condition of convergence.
The direction that fitness function has instructed genetic algorithm to evolve, along with the variation of the value of fitness function, genetic algorithm converges or disperse.Be within 0 o'clock, to think algorithmic statement to obtain optimal solution in the value of fitness function.Fitness function value is less, and now the result of algorithm is more outstanding.
Interference matrix is for after genetic algorithm, fitness function be exactly in fact between all communities, disturb and.If while there is M community, fitness function as shown in the formula:
Wherein interf (Ai, Bj) is the interference coefficient between community A and B.Along with the evolution of algorithm, the individuality in every generation all can carry out fitness calculating, knows from experience for each and obtains a corresponding sumInterf, and issuable the whole network of allocative decision of this individuality representative of the less explanation of its value disturbs less.The worth of sumInterf reduces to instruct algorithm to be tending towards convergence.In the time having there is sumInterf=0 individual, algorithmic statement is described, obtains a globally optimal solution, illustrate that this individual allocative decision can not produce interference.
Step S104, in the time meeting the condition of convergence, the whole network PCI now of output planning.
In the time meeting the condition of convergence, in the time having there is sumInterf=0 individual, output the whole network PCI planning now, this is planned to optimum PCI planning.
Step S105, in the time not meeting the condition of convergence, carry out intersect, mutation operation carries out weight-normality and draws.
If do not meet the condition of convergence, and planning is now while being not optimum programming, need to carry out according to genetic algorithm and intersect, carry out weight-normality after mutation operation and draw, the principle of planning is that the cell cluster that those interference coefficients are greater than to the place, community imposing a condition is planned again again.After weight-normality is drawn, continue the population after having planned to carry out fitness assessment, calculate fitness function value, and judge whether to meet the condition of convergence, if met, algorithm finishes, and does not meet, and again plans, until output optimum programming, concrete, optimum programming result can present by GIS, also can present by output excel form.
embodiment bis-:
Fig. 4 shows the structure of the device for planning of the whole network LTE community PCI that the embodiment of the present invention provides, only shows for convenience of explanation the part relevant to the embodiment of the present invention.
The device for planning of the whole network LTE community PCI that the present embodiment provides comprises:
Just planning module 41, for carrying out initialization planning to the whole network PCI;
Matrix is set up module 42, for building the whole network interference matrix;
Convergence judge module 43, for calculating fitness function value according to described interference matrix, and judges whether to meet the condition of convergence;
Planning output module 44, in the time meeting the condition of convergence, output the whole network PCI planning now;
Heavy planning module 45, in the time not meeting the condition of convergence, execution intersects, mutation operation carries out weight-normality and draws.
In the present embodiment, above-mentioned functions module 41-45 respectively correspondence has realized the step S101-S105 in embodiment mono-, concrete, first carry out PCI initialization planning by first planning module 41, then matrix is set up module 42 and is set up the whole network interference matrix, convergence judge module 43 judges according to described interference matrix whether fitness function restrains, in the time meeting the condition of convergence, planning output module 44 is exported the whole network PCI planning now, otherwise carrying out weight-normality, draws heavy planning module 45, until export optimum PCI planning.
When specific implementation, described just planning module 41 comprises:
Community arrangement units, for arranging the whole network community according to longitude and latitude;
PCI allocation units, for being each cell allocation PCI according to Plan Rule.
Described matrix is set up module 42 and is comprised:
Interference coefficient computing unit, for the interference coefficient between calculation plot and community;
Interference matrix is set up unit, for set up the whole network interference matrix by interference coefficient.
Wherein, described interference coefficient computing unit comprises:
Scope is determined assembly, for determining the coverage of each community;
Interference coefficient is determined assembly, covers overlapping area for calculating Liang Ge community, assesses the interference coefficient of Liang Ge community by overlapping area.
To sum up, the embodiment of the present invention provides planing method and the device of a kind of the whole network LTE community PCI based on genetic algorithm, first utilize and produce initialization the whole network PCI planning, set up interference matrix in conjunction with existing network work ginseng and planning PCI again, PCI annoyance level is assessed, according to the assessment result of interference matrix, determine whether population is intersected again, mutation operation, until output optimum programming, to help network optimization personnel to plan fast and accurately the whole network LTE community PCI, thereby improve network optimization personnel's operating efficiency.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (10)
1. a planing method of the whole network LTE community PCI, is characterized in that, described method comprises:
The whole network PCI is carried out to initialization planning;
Build the whole network interference matrix;
Calculate fitness function value according to described interference matrix, and judge whether to meet the condition of convergence;
In the time meeting the condition of convergence, output the whole network PCI planning now;
In the time not meeting the condition of convergence, execution intersects, mutation operation carries out weight-normality and draws.
2. method as claimed in claim 1, is characterized in that, described the whole network PCI is carried out to initialization planning step, specifically comprises:
The whole network community is arranged according to longitude and latitude;
Then be each cell allocation PCI according to Plan Rule.
3. method as claimed in claim 2, is characterized in that, described structure the whole network interference matrix step, specifically comprises:
Interference coefficient between calculation plot and community;
Set up the whole network interference matrix by interference coefficient.
4. method as claimed in claim 3, is characterized in that, the interference coefficient step between described calculation plot and community, specifically comprises:
Determine the coverage of each community;
Calculate Liang Ge community and cover overlapping area, assess the interference coefficient of Liang Ge community by overlapping area.
5. method as described in claim 1-4 any one, is characterized in that, described fitness function is interference coefficient sum between all communities, fitness function value representation the whole network annoyance level, in the time that fitness function value is 0, meet the condition of convergence.
6. a device for planning of the whole network LTE community PCI, is characterized in that, described device comprises:
Just planning module, for carrying out initialization planning to the whole network PCI;
Matrix is set up module, for building the whole network interference matrix;
Convergence judge module, for calculating fitness function value according to described interference matrix, and judges whether to meet the condition of convergence;
Planning output module, in the time meeting the condition of convergence, output the whole network PCI planning now;
Heavy planning module, in the time not meeting the condition of convergence, execution intersects, mutation operation carries out weight-normality and draws.
7. install as claimed in claim 6, it is characterized in that, described just planning module comprises:
Community arrangement units, for arranging the whole network community according to longitude and latitude;
PCI allocation units, for being each cell allocation PCI according to Plan Rule.
8. install as claimed in claim 7, it is characterized in that, described matrix is set up module and is comprised:
Interference coefficient computing unit, for the interference coefficient between calculation plot and community;
Interference matrix is set up unit, for set up the whole network interference matrix by interference coefficient.
9. install as claimed in claim 8, it is characterized in that, described interference coefficient computing unit comprises:
Scope is determined assembly, for determining the coverage of each community;
Interference coefficient is determined assembly, covers overlapping area for calculating Liang Ge community, assesses the interference coefficient of Liang Ge community by overlapping area.
10. as described in claim 6-9 any one, install, it is characterized in that, described fitness function is interference coefficient sum between all communities, fitness function value representation the whole network annoyance level, in the time that fitness function value is 0, described convergence judge module judgement meets the condition of convergence.
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