CN101083831A - Method for generating adjacent cells - Google Patents

Abstract

The present invention discloses a method of generating adjacent district, the method is as follows: Load the digital map of planning district that need generate the list of adjacent district, then calculate the power of the receiving signal with the use of region geographic data and the data of base stations, and then generate the covering map of service district according to the power of the receiving signal; Generate the adjacent district list of each service district grid by grid, in the covering map of the service district; Determine the signal intensity and telephone traffic of each adjacent district in the switching band; Sort each adjacent district by the weighting value of the signal intensity and telephone traffic in the switching band, and then determine the priority of this service area in the list of adjacent districts; choose adjacent district for each service area, in accordance with the number of adjacent districts required by each service district. With the use of this invention, the relationship of adjacent area could be relatively accurate achieved in the network planning, so precise district would be chosen and network quality would be optimized.

Description

A kind of method that generates adjacent sub-district

Technical field

The present invention relates to communication technical field, be meant a kind of method that generates adjacent sub-district especially.

Background technology

In the long-run development process of mobile communication, along with the user constantly increases, the area of coverage constantly enlarges, and frequency resource is limited, therefore, in order to solve the problem of frequency disparities between supply and demand, proposes the notion of honeycomb division.The honeycomb division is meant the omni-base station district is split into sector cell, or sector cell is split into several sub-districts.These sub-districts overlap, and are cellular, and several sub-districts constitute a district group.

During conversing, when travelling carriage when a sub-district enters another sub-district, network can be controlled in real time, and travelling carriage is switched to some channels of new sub-district from the used channel in former sub-district, and guarantees that conversation is uninterrupted.If fan anteena is used in the sub-district, when travelling carriage when a sector enters another sector, also to similarly switch, this mode also is called the sub-district gravity treatment under idle (Idle) pattern, below will exist switching and how much adjacent sub-districts to claim to switch neighbor cell, be called for short adjacent sub-district.

In practical operation, the definition of handoff relation is chosen carefully by staff's control map often and is switched neighbor cell and disturb neighbor cell, take the most of the time of data definition, simultaneously, because radio wave propagation is subjected to the hypsography variable effect very big, Ding Yi adjacent sub-district is often not accurate enough in this way.

For travelling carriage can both be switched under various conditions timely, can carry out smoothly all the time with the conversation that guarantees the mobile subscriber, this switches travelling carriage with regard to needing different trigger conditions accordingly.Trigger condition can comprise variations such as signal level, signal quality, distance and traffic.Therefore, whether accurate, the complete direct handover success rate that influences of adjacent cell list.

At present, generate adjacent sub-district by following dual mode usually.

First method: the adjacent sub-district of hand picking according to the map.Such as: will have common geographical frontier with Serving cell and the base station on same horizon joins in this adjacent cells of cells table, switch, can define one deck neighbor cell more for fear of call drop and table tennis.But this method will cause the number of cells in the adjacent cell list too much, thereby causes the switching of excessive number, therefore is easy to cause the overload of signaling traffic load.Certainly, also can define according to criterion distance, this need utilize the diameter of appointment to define a circumference, and the adjacent sub-district of ground floor all just is included in this circumference, then all sub-districts in this circumference all is defined in the adjacent cell list.

Fig. 1 is desirable honeycomb distribution map.The desirable honeycomb distribution map of Fig. 2 for distributing and obtain according to telephone traffic.If this moment is by the adjacent cell list of the artificial definition desirable honeycomb distribution map that distribution obtains according to telephone traffic, consider two-layer adjacent sub-district, the adjacent cell list that obtains relative Serving cell 61 comprises: 71,291,281,481,551,251,81,301,111,101,631,691,471,541,461,31,41,261.But first method can not be in conjunction with the decline situation of the geographical environment of reality, and the desirable cellular model that covers of dependence and sub-district.May miss the good and non-conterminous neighbor cell in actual geographical position of signal like this, perhaps adjacent but signal is propagated and is stopped and level does not reach the sub-district of switching threshold and has been made as neighbor cell with the geographical position, so the neighbor cell that generates is accurate inadequately.Therefore, the adjacent sub-district of artificial division can not be in conjunction with the influence of actual geographical environment to radio wave propagation, and waste time and energy.

Second method: on a period of time, by measuring the signal on measured channel, transmit and receive, and generate an orderly measured channel tabulation according to measurement result.Be put in the neighbor cell list by sub-district then, produce a neighbor cell list with sub-district of desired number with the measured channel of the serious interference of some.But this method need increase the metrical information of travelling carriage or base station, causes the signaling burden between travelling carriage and base station.

In sum, in present network optimization technology, also neither one can be taken all factors into consideration geographical environment and the signal power is selected adjacent sub-district, therefore the adjacent sub-district that obtains is not accurate enough, therefore the too crowded situation of cell channel may occur, at this moment, travelling carriage is in handoff procedure, inaccurate or cell channel is crowded owing to adjacent sub-district produces call drop, so handover success rate is low.

Summary of the invention

In view of this, the object of the present invention is to provide a kind of method that generates adjacent sub-district, the handover success rate when making it can improve the travelling carriage switching.

In order to achieve the above object, the invention provides a kind of method that generates adjacent sub-district, this method is achieved in that

A. load the numerical map in the planning zone that needs the generation adjacent cell list, utilize the geodata and the base station data in zone to calculate the received signal level of all sub-districts in this zone, generate the Serving cell coverage diagram according to received signal level;

B. in the Serving cell coverage diagram, generate the adjacent cell list of each Serving cell by the grid circulation;

C. determine that each adjacent sub-district is in signal strength signal intensity and the telephone traffic of switching band;

D. according to each adjacent sub-district at the signal strength signal intensity of switching band and the telephone traffic laggard line ordering of weighting respectively, determine the priority in the neighbor cell list of this Serving cell; According to the adjacent sub-district number of the requirement of each Serving cell of determining, for each Serving cell is selected adjacent sub-district.

Generate the step of the adjacent cell list of each Serving cell among the step b: be by the grid circulation according to pre-configured adjacent area criterion, and judge whether to satisfy the adjacent area criterion at every grid place according to geographical position or signal strength signal intensity, and the sub-district that will satisfy the adjacent area criterion is added in the adjacent cell list of Serving cell.

Described adjacent sub-district criterion can be to determine according to signal strength values.

Described adjacent sub-district criterion also can for: will force altogether that the sub-district at station is adjacent sub-district, or be adjacent sub-district for time big sub-district received signal level.

Step b can comprise:

B1, select a grid, determine the Serving cell of this grid, the telephone traffic of this grid is added in the telephone traffic of this grid corresponding with service sub-district as current grid,

B2, judge whether this Serving cell level is lower than switching threshold,, continue next grid to return step b1 as current grid if be not less than switching threshold; If be lower than, execution in step b3 then;

B3, the next sub-district of selection except that the service sub-district judge whether the signal level of this sub-district of selecting surpasses switching threshold, if surpass, and execution in step b4; If do not surpass, then return step b3;

B4, this sub-district is joined step b1 obtain in the adjacent cell list of Serving cell, and the telephone traffic at this grid place of accumulative total is in the telephone traffic of this sub-district;

B5, judge whether sub-district circulation finishes, if finish, execution in step b6 then, otherwise, execution in step b3;

B6, judge whether the grid circulation finishes in the planning zone, if do not have, execution in step b1 then, otherwise, continue step c.

Can calculate according to following weighting function in the step of the signal strength signal intensity of switching band and the laggard line ordering of telephone traffic difference weighting according to each adjacent sub-district in the steps d:

$f_i\left(x\right)=f_{1i}\left(x\right)\·w_1+f_{2i}\left(x\right)\·w_2=\underset{x=0,y=0}{\overset{x=m,y=n}{\mathrm{\Σ}}}{P}_{(t=i,\mathrm{Gxy})}{\mathrm{IfHO}}_{(t=i,\mathrm{Gxy})}/\underset{t=1}{\overset{T}{\mathrm{\Σ}}}\underset{x=0,y=0}{\overset{x=m,y=n}{\mathrm{\Σ}}}{P}_{(t,\mathrm{Gxy})}{\mathrm{IfHO}}_{(t,\mathrm{Gxy})}\·w_1$

$+\underset{x=0,y=0}{\overset{x=n1,y=n}{\mathrm{\Σ}}}{\mathrm{Tr}}_{(t=i,\mathrm{Gxy})}{\mathrm{IfCov}}_{(t=i,\mathrm{Gxy})}/\underset{t=1}{\overset{T}{\mathrm{\Σ}}}\underset{x=0,y=0}{\overset{x=m,y=n}{\mathrm{\Σ}}}{\mathrm{Tr}}_{(t,\mathrm{Gxy})}{\mathrm{IfCov}}_{(t,\mathrm{Gxy})}\·(1-w_2)$

Wherein, f _1i(x) be the conditional function of the signal energy of cell i in the distribution of switching band,

f _2i(x) be the conditional function of telephone traffic, the weight of signal energy is 0＜w ₁＜1, the weight of telephone traffic is 0＜w ₂＜1, establish the wide m of being in planning region, height is n, the neighbor cell of Serving cell has T, f _1i(x) a kind of concrete manifestation form is:

f _1i(x)=cell i in all adjacent sub-districts of energy/this Serving cell that switches the band place in the energy sum of switching the band place; If the signal energy of certain sub-district t at certain grid G xy place is P _{(t, Gxy)}, the switching band whether this grid G xy belongs to this sub-district t is IfHO _{(t, Gxy)}, then

$f_{1i}\left(x\right)=\underset{x=0,y=0}{\overset{x=m,y=n}{\mathrm{\Σ}}}{P}_{(t=i,\mathrm{Gxy})}{\mathrm{IfHO}}_{(t=i,\mathrm{Gxy})}/\underset{t=1}{\overset{T}{\mathrm{\Σ}}}\underset{x=0,y=0}{\overset{x=m,y=n}{\mathrm{\Σ}}}{P}_{(t,\mathrm{Gxy})}{\mathrm{IfHO}}_{(t,\mathrm{Gxy})}$

f _2i(x) a kind of concrete manifestation form is: f _2i(x)=the telephone traffic sum of all adjacent sub-districts of telephone traffic/this Serving cell of cell i; If the telephone traffic of certain sub-district t at certain grid G xy place is Tr _{(t, Gxy)}, the service range whether this grid G xy belongs to this sub-district t is IfCov _{(t, Gxy)}, then $f_{2i\left(x\right)}=\underset{x=0,y=0}{\overset{x=n1,y=n}{\mathrm{\Σ}}}{\mathrm{Tr}}_{(t=i,\mathrm{Gxy})}{\mathrm{IfCov}}_{(t=i,\mathrm{Gxy})}/\underset{t=1}{\overset{T}{\mathrm{\Σ}}}\underset{x=0,y=0}{\overset{x=m,y=n}{\mathrm{\Σ}}}{\mathrm{Tr}}_{(t,\mathrm{Gxy})}{\mathrm{IfCov}}_{(t,\mathrm{Gxy})}.$

In the steps d according to the priority of each adjacent sub-district of determining, for each Serving cell select adjacent sub-district step can for: according to priority orders, in the neighbor cell list of this Serving cell, select to preestablish the sub-district of number.

Method of the present invention, in the network planning, introduce the numerical map that characterizes geographical environment and come the signal level of each sub-district of Practical Calculation in coverage, after the telephone traffic difference weighting of the distribution of switching band and each cell load, determine the priority of each adjacent sub-district simultaneously according to the signal energy of neighbor cell, obtain relatively accurate adjacent cell relations, and then can select accurate sub-district, network quality is optimized.

The cell coverage area that obtains according to the present invention is not a hexagonal desirable honeycomb, but the irregular coverage that more conforms to the actual situation that obtains according to the geographical environment of reality, the adjacent cell list that uses the present invention to generate in RNC is more accurate and effective than the adjacent sub-district of artificial definition, can reduce the call drop that causes because the definition of adjacent cell relations is unreasonable, and, can not cause adjacent little area definition too much to increase the signaling burden of travelling carriage or base station.

Description of drawings

Fig. 1 shows desirable hexagon honeycomb distribution map;

Fig. 2 shows the desirable honeycomb distribution map that distributes and obtain according to telephone traffic;

Fig. 3 shows the present invention and generates adjacent sub-district schematic flow sheet;

Fig. 4 shows the specific embodiment schematic flow sheet that the present invention generates adjacent sub-district;

Fig. 5 is the sub-district coverage diagram of the reality of the present invention's generation.

Embodiment

For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with accompanying drawing.

Can not the invention provides a kind of in conjunction with of the influence of actual geographical environment in order to overcome the adjacent sub-district of artificial division to radio wave propagation by introducing digital geographical map, the method for the adjacent sub-district of automatic planning in the network planning.The present invention introduces the numerical map that characterizes geographical environment and comes the received signal level of each sub-district of Practical Calculation in coverage, after the telephone traffic difference weighting of the distribution of switching band and each cell load, determine the priority of each adjacent sub-district simultaneously according to the received signal level of neighbor cell, obtain relatively accurate adjacent cell relations, and then can generate accurate adjacent cell list, network quality is optimized.

Referring to shown in Figure 3, realize that method of the present invention may further comprise the steps:

Step 301: load the numerical map in the planning zone that needs the generation adjacent cell list, utilize the geodata and the base station data in planning zone to calculate the received signal level of all sub-districts in this zone, generate the Serving cell coverage diagram according to received signal level.

Step 302: the adjacent cell list that in the Serving cell coverage diagram, generates each Serving cell by the grid circulation.

The adjacent cell list that generates each Serving cell is achieved in that according to pre-configured adjacent area criterion by the grid circulation, and judge whether to satisfy the adjacent area criterion at every grid place according to geographical position or signal strength signal intensity, and the sub-district that will satisfy the adjacent area criterion is added in the adjacent cell list of Serving cell.Described adjacent area criterion is to determine according to signal strength values, can certainly be that adjacent sub-district, received signal level are adjacent sub-district etc. for time big sub-district with the sub-district of forcing to stand altogether.

Step 303: determine that each adjacent sub-district is in signal strength signal intensity and the telephone traffic of switching band.

Step 304: at the signal strength signal intensity of switching band and the telephone traffic laggard line ordering of weighting respectively, determine the priority in the neighbor cell list of this Serving cell according to each adjacent sub-district; According to the adjacent sub-district number of the requirement of each Serving cell of determining, for each Serving cell is selected adjacent sub-district.

Preserve the adjacent cell ID that preestablishes number according to adjacent native region priority.

In the present invention, the method that signal strength signal intensity and telephone traffic are weighted is as follows:

If the signal energy of certain cell i is f at the conditional function of the distribution of switching band _1i(x), the conditional function of telephone traffic is f _2i(x), the weight of signal energy is 0＜w ₁＜1, the weight of telephone traffic is 0＜w ₂＜1, then the total weighting function of this cell i can be expressed as: f _i(x)=f _1i(x) w ₁+ f _2i(x) (1-w ₂);

If the wide of planning region is m, height is n, and the neighbor cell of certain Serving cell has T, f _1i(x) a kind of concrete manifestation form is:

f _1i(x)=cell i in all adjacent sub-districts of energy/this Serving cell that switches the band place in the energy sum of switching the band place;

If the signal energy of certain sub-district t at certain grid G xy place is P _{(t, Gxy)}, the switching band whether this grid G xy belongs to this sub-district t is IfHO _{(t, Gxy)}, then $f_{1i}\left(x\right)=\underset{x=0,y=0}{\overset{x=m,y=n}{\mathrm{\Σ}}}{P}_{(t=i,\mathrm{Gxy})}{\mathrm{IfHO}}_{(t=i,\mathrm{Gxy})}/\underset{t=1}{\overset{T}{\mathrm{\Σ}}}\underset{x=0,y=0}{\overset{x=m,y=n}{\mathrm{\Σ}}}{P}_{(t,\mathrm{Gxy})}{\mathrm{IfHO}}_{(t,\mathrm{Gxy})};$

f _2i(x) a kind of concrete manifestation form is: f _2i(x)=the telephone traffic sum of all adjacent sub-districts of telephone traffic/this Serving cell of cell i;

If the telephone traffic of certain sub-district t at certain grid G xy place is Tr _{(t, Gxy)}, the service range whether this grid G xy belongs to this sub-district t is IfCov _{(t, Gxy)}, then $f_{2i}\left(x\right)=\underset{x=0,y=0}{\overset{x=m,y=n}{\mathrm{\Σ}}}{\mathrm{Tr}}_{(t=i,\mathrm{Gxy})}{\mathrm{IfCov}}_{(t=i,\mathrm{Gxy})}/\underset{t=1}{\overset{T}{\mathrm{\Σ}}}\underset{x=0,y=0}{\overset{x=m,y=n}{\mathrm{\Σ}}}{\mathrm{Tr}}_{(t,\mathrm{Gxy})}{\mathrm{IfCov}}_{(t,\mathrm{Gxy})}.$

So the total weighting function of cell i can be expressed as:

$f_i\left(x\right)=f_{1i}\left(x\right)\·w_1+f_{2i}\left(x\right)\·w_2=\underset{x=0,y=0}{\overset{x=m,y=n}{\mathrm{\Σ}}}{P}_{(t=i,\mathrm{Gxy})}{\mathrm{IfHO}}_{(t=i,\mathrm{Gxy})}/\underset{t=1}{\overset{T}{\mathrm{\Σ}}}\underset{x=0,y=0}{\overset{x=m,y=n}{\mathrm{\Σ}}}{P}_{(t,\mathrm{Gxy})}{\mathrm{IfHO}}_{(t,\mathrm{Gxy})}\·w_1$

$+\underset{x=0,y=0}{\overset{x=m,y=n}{\mathrm{\Σ}}}{\mathrm{Tr}}_{(t=i,\mathrm{Gxy})}{\mathrm{IfCov}}_{(t=i,\mathrm{Gxy})}/\underset{t=1}{\overset{T}{\mathrm{\Σ}}}\underset{x=0,y=0}{\overset{x=m,y=n}{\mathrm{\Σ}}}{\mathrm{Tr}}_{(t,\mathrm{Gxy})}{\mathrm{IfCov}}_{(t,\mathrm{Gxy})}\·(1-w_2)$

Referring to shown in Figure 4, the concrete steps that present embodiment generates adjacent cell list are as follows:

Step 401: load the numerical map in the planning zone that needs the generation adjacent cell list, and the telephone traffic distributed intelligence in the record planning region.

Here, loading numerical map can utilize existing software to realize.This numerical map writes down the geodata and the base station data in this planning zone.Geodata comprises the information of information, building position distribution and depth of building of information, the increased surface covering of hypsography; Base station data comprises longitude, latitude, height of transmitting antenna, the transmitting power of base station, directional diagram of used antenna etc.

Telephone traffic distributes can be expressed as Erl/km^2.The telephone traffic distributed intelligence can utilize traffic density to represent.For example, the planning region is divided into three density areas, the corresponding different covering radius in different densities zone.

Step 402: the received signal level that utilizes the geodata that writes down in the numerical map and base station data to calculate all sub-districts generates the Serving cell coverage diagram.

At present, utilizing numerical map to generate the Serving cell coverage diagram is that prior art can realize.The basic principle that generates the Serving cell coverage diagram is such: the propagation model used according to the base station, and calculation base station is to the electromagnetic propagation loss that needs each grid in the planning zone; And according to the information such as transmitting power of employed antenna in base station and common signal channel, calculate the signal strength signal intensity of common signal channel each point in the estimation range, it is received signal level, at last the grid in the numerical map is circulated, received signal level ordering according to each sub-district that receives at the grid place, every grid maximum receiving signal level corresponding district is exactly the Serving cell of this grid, and then obtains the Serving cell coverage diagram.Here, grid is the progress of numerical map, is 20 * 20 units as every grid, and a grid can be used as a point.

Step 403: select a grid as current grid.

Step 404: the telephone traffic of this grid is added in the telephone traffic of this grid corresponding with service sub-district.

Step 405: judge whether this Serving cell level is lower than switching threshold,, continue with next grid as current grid execution in step 403 if be not less than switching threshold; If be lower than, then execution in step 406.

The telephone traffic of this grid is added in the telephone traffic of corresponding Serving cell and is achieved in that the telephone traffic that reads this grid according to traffic density figure layer, the grid telephone traffic equals traffic density and multiply by the grid area, and the telephone traffic of this grid is added in the Serving cell that obtains this grid in the step 402.

Step 406: select next sub-district as current area, i.e. sub-district except that the service sub-district.

Step 407: whether the signal level of judging this sub-district of selecting surpasses switching threshold, if surpass, and execution in step 408; If do not surpass, then return step 406.

Step 408: this sub-district is joined in the adjacent cell list of Serving cell of current grid correspondence, and the telephone traffic at this grid place of accumulative total is in the telephone traffic of this sub-district.

Step 409: judge whether the sub-district circulation finishes, if finish, then execution in step 410, otherwise, execution in step 406.

Step 410: judge whether the grid circulation finishes in the planning region, if do not have, then execution in step 403, otherwise, continue step 411.

Step 411: the neighbor cell list to each Serving cell is switching size and the laggard line ordering of being with of telephone traffic difference weighting according to signal energy, determines the priority of all adjacent sub-districts of each Serving cell.

The neighbor cell list of Serving cell is distinguished the method for weighting in the size of switching band and telephone traffic according to signal energy: the weighting function according to the single subdistrict of introducing previously comes weighting, and is as follows:

$f_i\left(x\right)=f_{1i}\left(x\right)\·w_1+f_{2i}\left(x\right)\·w_2=\underset{x=0,y=0}{\overset{x=m,y=n}{\mathrm{\Σ}}}{P}_{(t=i,\mathrm{Gxy})}{\mathrm{IfHO}}_{(t=i,\mathrm{Gxy})}/\underset{t=1}{\overset{T}{\mathrm{\Σ}}}\underset{x=0,y=0}{\overset{x=m,y=n}{\mathrm{\Σ}}}{P}_{(t,\mathrm{Gxy})}{\mathrm{IfHO}}_{(t,\mathrm{Gxy})}\·w_1$

$+\underset{x=0,y=0}{\overset{x=m,y=n}{\mathrm{\Σ}}}{\mathrm{Tr}}_{(t=i,\mathrm{Gxy})}{\mathrm{IfCov}}_{(t=i,\mathrm{Gxy})}/\underset{t=1}{\overset{T}{\mathrm{\Σ}}}\underset{x=0,y=0}{\overset{x=m,y=n}{\mathrm{\Σ}}}{\mathrm{Tr}}_{(t,\mathrm{Gxy})}{\mathrm{IfCov}}_{(t,\mathrm{Gxy})}\·(1-w_2)$

Step 412: preserve the information of adjacent cells that requires number according to adjacent native region priority.

Referring to shown in Figure 5, the adjacent cell list that calculates Serving cell 61 is: 481,251,281,71,291,261,551,471,31,691,101,41,271,51,541,461,11,631.

In Fig. 5, adjacent sub-district 481 and 251 and the adjacent area of Serving cell 61 bigger, simultaneously, from adjacent sub-district 481 and 251 to the path of Serving cell 61 near the building sub-district 281,71,291 building to the path of Serving cell 61 low, so the priority height of adjacent sub-district 481 and 251.Adjacent sub-district 81,301,111 is subjected to stopping of high-lager building to the path of Serving cell 61, be in the high density telephone traffic region again, though so, replaced by the 3rd layer of good adjacent sub-district 11 of signal propagation conditions (density telephone traffic region in being in simultaneously), 51,271 in the adjacent sub-district of the second layer.

From above-mentioned example as can be seen, the adjacent sub-district of generation of the present invention method can take into full account the influence of geographical environment to radio wave propagation, also can consider the telephone traffic carrying of each sub-district simultaneously, and the adjacent cell list of generation more conforms to the actual situation.

In a word, the above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.

Claims (8)

1, a kind of method that generates adjacent sub-district, it is characterized in that: this method may further comprise the steps:

A. load the numerical map in the planning zone that needs the generation adjacent cell list, utilize the geodata and the base station data in zone to calculate the received signal level of all sub-districts in this zone, generate the Serving cell coverage diagram according to received signal level;

B. in the Serving cell coverage diagram, generate the adjacent cell list of each Serving cell by the grid circulation;

C. determine that each adjacent sub-district is in signal strength signal intensity and the telephone traffic of switching band;

D. according to each adjacent sub-district at the signal strength signal intensity of switching band and the telephone traffic laggard line ordering of weighting respectively, determine the priority in the neighbor cell list of this Serving cell; According to the adjacent sub-district number of the requirement of each Serving cell of determining, for each Serving cell is selected adjacent sub-district.

2, method according to claim 1, it is characterized in that, the step that generates the adjacent cell list of each Serving cell among the step b is: circulate by grid according to pre-configured adjacent area criterion, judge whether to satisfy the adjacent area criterion at each grid place according to geographical position or signal strength signal intensity, and the sub-district that will satisfy the adjacent area criterion is added in the adjacent cell list of Serving cell.

3, method according to claim 2 is characterized in that, described adjacent area criterion is to determine according to signal strength values.

4, method according to claim 3 is characterized in that, described adjacent area criterion is: is adjacent sub-district with received signal level for time big sub-district.

5, method according to claim 2 is characterized in that, described adjacent area criterion is: will forcing altogether, the sub-district at station is adjacent sub-district.

6, method according to claim 1 is characterized in that, step b comprises:

B1, select a grid, determine the Serving cell of this grid, the telephone traffic of this grid is added in the telephone traffic of this grid corresponding with service sub-district as current grid;

B2, judge whether this Serving cell level is lower than switching threshold,, continue next grid to return step b1 as current grid if be not less than switching threshold; If be lower than, execution in step b3 then;

B3, the next sub-district of selection except that the service sub-district judge whether the signal level of this sub-district of selecting surpasses switching threshold, if surpass, and execution in step b4; If do not surpass, then return step b3;

B4, this sub-district is joined in the adjacent cell list of the Serving cell that step b1 obtains, and the telephone traffic at this grid place of accumulative total is in the telephone traffic of this sub-district;

B5, judge whether sub-district circulation finishes, if finish, execution in step b6 then, otherwise, execution in step b3;

B6, judge whether the grid circulation finishes in the planning zone, if do not have, execution in step b1 then, otherwise, continue step c.

7, according to any described method of claim in the claim 1～6, it is characterized in that, in the steps d according to each adjacent sub-district the signal strength signal intensity of switching band and telephone traffic respectively the step of the laggard line ordering of weighting be to calculate according to following weighting function:

$f_i\left(x\right)=f_{1i}\left(x\right)\·w_1+f_{2i}\left(x\right)\·w_2=\underset{x=0,y=0}{\overset{x=m,y=n}{\mathrm{\Σ}}}{P}_{(t=i,\mathrm{Gxy})}{\mathrm{IfHO}}_{(t=i,\mathrm{Gxy})}/\underset{t=1}{\overset{T}{\mathrm{\Σ}}}\underset{x=0,y=0}{\overset{x=m,y=n}{\mathrm{\Σ}}}{P}_{(t,\mathrm{Gxy})}{\mathrm{IfHO}}_{(t,\mathrm{Gxy})}\·w_1$

$+\underset{x=0,y=0}{\overset{x=m,y=n}{\mathrm{\Σ}}}{\mathrm{Tr}}_{(t=i,\mathrm{Gxy})}{\mathrm{IfCov}}_{(t=i,\mathrm{Gxy})}/\underset{t=1}{\overset{T}{\mathrm{\Σ}}}\underset{x=0,y=0}{\overset{x=m,y=n}{\mathrm{\Σ}}}{\mathrm{Tr}}_{(t,\mathrm{Gxy})}{\mathrm{IfCov}}_{(t,\mathrm{Gxy})}\·(1-w_2)$

Wherein, f _1i(x) be the conditional function of the signal energy of cell i in the distribution of switching band,

f _2i(x) be the conditional function of telephone traffic, the weight of signal energy is 0＜w ₁＜1, the weight of telephone traffic is 0＜w ₂＜1, establish the wide m of being in planning region, height is n, the neighbor cell of Serving cell has T,

f _1i(x)=cell i in all adjacent sub-districts of energy/this Serving cell that switches the band place in the energy sum of switching the band place; If the signal energy of certain sub-district t at certain grid G xy place is P _{(t, Gxy)}, the switching band whether this grid G xy belongs to this sub-district t is IfHO _{(t, Gxy)}, then

$f_{1i}\left(x\right)=\underset{x=0,y=0}{\overset{x=m,y=n}{\mathrm{\Σ}}}{P}_{(t=i,\mathrm{Gxy})}{\mathrm{IfHO}}_{(t=i,\mathrm{Gxy})}/\underset{t=1}{\overset{T}{\mathrm{\Σ}}}\underset{x=0,y=0}{\overset{x=m,y=n}{\mathrm{\Σ}}}{P}_{(t,\mathrm{Gxy})}{\mathrm{IfHO}}_{(t,\mathrm{Gxy})}$

f _2i(x)=the telephone traffic sum of all adjacent sub-districts of telephone traffic/this Serving cell of cell i; If the telephone traffic of certain sub-district t at certain grid G xy place is Tr _{(t, Gxy)}, the service range whether this grid G xy belongs to this sub-district t is IfCov _{(t, Gxy)}, then $f_{2i}\left(x\right)=\underset{x=0,y=0}{\overset{x=m,y=n}{\mathrm{\Σ}}}{\mathrm{Tr}}_{(t=i,\mathrm{Gxy})}{\mathrm{IfCov}}_{(t=i,\mathrm{Gxy})}/\underset{t=1}{\overset{T}{\mathrm{\Σ}}}\underset{x=0,y=0}{\overset{x=m,y=n}{\mathrm{\Σ}}}{\mathrm{Tr}}_{(t,\mathrm{Gxy})}{\mathrm{IfCov}}_{(t,\mathrm{Gxy})}.$

8, method according to claim 1, it is characterized in that, according to the priority of each adjacent sub-district of determining, select the step of adjacent sub-district for each Serving cell and be in the steps d:, in the neighbor cell list of this Serving cell, select to preestablish the sub-district of number according to priority orders.

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