CN102547752A - Method and device for coverage assessment of wireless network - Google Patents

Abstract

The invention provides a method and a device for coverage assessment of a wireless network. The method includes of obtaining test data containing neighborhood signal strength information and corresponding geographic information, collecting the neighborhood signal strength information to corresponding grids according to the geographic information, wherein the grids are obtained by dividing the area to be assessed of the wireless network according to the geographic information; for the grids with the test data, obtaining signal strength of scheduled number of neighborhoods in the grids; obtaining a first propagation model corresponding to the first neighborhood in the scheduled number of the neighborhoods; correcting parameters of the first propagation model according to the signal strength of the first neighborhood in the grids and the distance between each grid and a base station of the first neighborhood to obtain the corrected first propagation model; and calculating the coverage situation of the first neighborhood according to the corrected first propagation model. The method and the device for the coverage assessment of the wireless network can improve accuracy of coverage assessment.

Description

A kind of coverage evaluating method and device of wireless network

Technical field

The present invention relates to wireless communication field, particularly a kind of coverage evaluating method and device of wireless network.

Background technology

At present, industry is when carrying out the planning of wireless communication system macrocellular network and carrying out the signal coverage evaluating of existing network, and the method that adopts usually is following:

At first; Confirm the propagation model that in link budget, uses, like the Okumura-Hata propagation model of classics, and the descendant develops and the model that comes on this basis; For example, common 9999 propagation models that adopt of Ericsson, the common General propagation model that adopts of Huawei etc.

Secondly, according to the characteristics of wireless environment, wireless environment is divided into following several types: dense city, general city, villages within the city and suburb etc.

Then, propagation model is proofreaied and correct, promptly, obtained actual loss value, proofread and correct the pairing propagation model of dissimilar wireless environments with this through test on the spot to every type wireless environment.

At last, use the coverage condition of the propagation model calculating wireless network after proofreading and correct.

The inventor finds that there is following shortcoming at least in prior art in realizing process of the present invention:

The propagation model that different districts under the same wireless environment is corresponding is identical, and the kind of wireless environment is limited, can't reflect the actual environment of network fully;

Propagation model is carried out timing, test data is not carried out preliminary treatment, make that the precision of coverage evaluating is not high.

Summary of the invention

The coverage evaluating method and the device that the purpose of this invention is to provide a kind of wireless network carry out the rasterizing processing through treating assessment area, improve the precision of coverage evaluating.

For realizing the foregoing invention purpose, the present invention provides a kind of coverage evaluating method of wireless network, comprising:

Obtain the signal strength information that comprises the sub-district and the test data of corresponding geographical location information; According to said geographical location information; The signal strength information of said sub-district is converged in the corresponding grid; Wherein, said grid is according to the geographical position zone to be assessed of said wireless network to be divided to obtain;

For the grid that test data is arranged, obtain the signal strength signal intensity of a predetermined number sub-district in this grid;

Obtain with a said predetermined number sub-district in the first corresponding propagation model of first sub-district;

According to the distance between the base station of signal strength signal intensity and each grid and said first sub-district of said first sub-district in each grid, the parameter of said first propagation model is proofreaied and correct first propagation model after obtaining proofreading and correct;

Calculate the coverage condition of said first sub-district according to first propagation model after the said correction.

Above-mentioned coverage evaluating method, wherein, the said signal strength signal intensity of a predetermined number sub-district in this grid of obtaining comprises:

Choose interior main Serving cell of this grid and adjacent sub-district as a said predetermined number sub-district;

For each sub-district of choosing, with the mean value of all signal strength values of this sub-district in this grid as the signal strength signal intensity of this sub-district in this grid.

Above-mentioned coverage evaluating method wherein, is saidly proofreaied and correct the parameter of said first propagation model according to the distance between the base station of signal strength signal intensity and each grid and said first sub-district of said first sub-district in each grid, comprising:

According to signal strength signal intensity, the transmitting power of said first sub-district and the antenna gain of said first sub-district of said first sub-district in each grid, calculate the corresponding loss of each grid;

According to the distance between the base station of the corresponding loss of each grid and each grid and said first sub-district, said first propagation model is carried out fitting a straight line;

Obtain the slope value and the values of intercept of the straight line that match obtains, with said efficiency value and values of intercept relevant parameter as first propagation model after proofreading and correct.

Above-mentioned coverage evaluating method wherein, is saidly calculated the coverage condition of said first sub-district according to first propagation model after the said correction, comprising:

For each grid that does not have test data, calculate the corresponding loss of this grid according to distance between the base station of this grid and said first sub-district and said first propagation model;

After the antenna gain addition with the transmitting power of said first sub-district and said first sub-district, deduct the corresponding loss of this grid again, obtain the signal strength signal intensity of said first sub-district in this grid.

Above-mentioned coverage evaluating method, wherein, the distance between grid and the base station is the distance between the transmitting antenna of center and base station of grid.

For realizing the foregoing invention purpose, the present invention also provides a kind of coverage evaluating device of wireless network, comprising:

Data aggregation module; Be used to obtain the signal strength information that comprises the sub-district and the test data of corresponding geographical location information; According to said geographical location information; The signal strength information of said sub-district is converged in the corresponding grid, and wherein, said grid is according to the geographical position zone to be assessed of said wireless network to be divided to obtain;

The signal strength signal intensity acquisition module is used for for the grid that test data is arranged, and obtains the signal strength signal intensity of a predetermined number sub-district in this grid;

The propagation model acquisition module is used for obtaining first propagation model corresponding with first sub-district of a said predetermined number sub-district;

The propagation model revision module is used for the parameter of said first propagation model being proofreaied and correct first propagation model after obtaining proofreading and correct according to the distance between the base station of signal strength signal intensity and each grid and said first sub-district of said first sub-district in each grid;

The coverage evaluating module is used for calculating according to first propagation model after the said correction coverage condition of said first sub-district.

Above-mentioned coverage evaluating device, wherein, said signal strength signal intensity acquisition module is further used for:

Choose interior main Serving cell of this grid and adjacent sub-district as a said predetermined number sub-district;

For each sub-district of choosing, with the mean value of all signal strength values of this sub-district in this grid as the signal strength signal intensity of this sub-district in this grid.

Above-mentioned coverage evaluating device, wherein, said propagation model revision module is further used for:

According to signal strength signal intensity, the transmitting power of said first sub-district and the antenna gain of said first sub-district of said first sub-district in each grid, calculate the corresponding loss of each grid;

According to the distance between the base station of the corresponding loss of each grid and each grid and said first sub-district, said first propagation model is carried out fitting a straight line;

Obtain the slope value and the values of intercept of the straight line that match obtains, with said efficiency value and values of intercept relevant parameter as first propagation model after proofreading and correct.

Above-mentioned coverage evaluating device, wherein, said coverage evaluating module is further used for:

For each grid that does not have test data, calculate the corresponding loss of this grid according to distance between the base station of this grid and said first sub-district and said first propagation model;

After the antenna gain addition with the transmitting power of said first sub-district and said first sub-district, deduct the corresponding loss of this grid again, obtain the signal strength signal intensity of said first sub-district in this grid.

Above-mentioned coverage evaluating device, wherein, the distance between grid and the base station is the distance between the transmitting antenna of center and base station of grid.

Compared with prior art, the invention has the beneficial effects as follows:

The present invention is with the corresponding propagation model in each sub-district; Utilize frequency sweep, the drive test test data of existing network to come the propagation model of each sub-district of existing network is carried out from dynamic(al) correction; Make propagation model truly reflect the overlay environment characteristic of this sub-district; Propagation model kind in the network has been refine to cell level, and all there is an own distinctive cover propagation model parameter each sub-district.The present invention also treats assessment area and has carried out the rasterizing division, and the test data in the grid has been carried out preliminary treatment, promptly; For a sub-district; The signal strength values of this sub-district all sampled points in this grid is averaged, mean value is as the signal strength signal intensity of this sub-district in this grid, like this; Can avoid the analysis deviation problem that causes because of test data is unbalanced, thereby make that the result of coverage evaluating is more accurate.In addition, divide the rasterizing coverage condition that can also obtain the whole network, be beneficial to carrying out of work such as follow-up rolling website planning, lane place planning, traffic distribution through rasterizing.

Description of drawings

Fig. 1 is the coverage evaluating method flow diagram of the wireless network of the embodiment of the invention;

Fig. 2 is the coverage evaluating structure drawing of device of the wireless network of the embodiment of the invention.

Embodiment

For making the object of the invention, technical scheme and advantage clearer, will combine accompanying drawing and specific embodiment to describe the present invention below.

With reference to Fig. 1, the coverage evaluating method of the wireless network of the embodiment of the invention comprises the steps:

Step 101: is a plurality of grids according to the geographical position with the area dividing to be assessed of wireless network;

For example, dividing each grid that obtains is the rectangle that on the GIS map, has regular length and width, and the big I of said grid is set at 50m * 50m.

Step 102: obtain the signal strength information that comprises the sub-district and the test data of corresponding geographical location information;

Wherein, said test data is drive test test data and/or sweep check data.

Step 103:, the signal strength information of said sub-district is converged in the corresponding grid according to said geographical location information;

Step 104:, obtain the signal strength signal intensity of a predetermined number sub-district in this grid for the grid that test data is arranged;

Specifically comprise: choose interior main Serving cell of this grid and adjacent sub-district as a said predetermined number sub-district;

For each sub-district of choosing, with the mean value of all signal strength values of this sub-district in this grid as the signal strength signal intensity of this sub-district in this grid.Preferably, before the signal strength values in the grid is averaged, can also reject abnormal data wherein earlier, then remaining data averaged.

Suppose that said predetermined number is 7, then can choose main Serving cell and adjacent sub-district in the grid according to following method:

If the layer of 7 sub-districts (LAYER) parameter is not 1, perhaps the signal strength signal intensity of 7 sub-districts all is not more than a layer thresholding (LAYERTHR), then according to the signal strength signal intensity size main Serving cell of decision and 6 adjacent areas;

If have only the LAYER parameter of 1 sub-district be 1 and signal strength signal intensity greater than LAYERTHR, then this sub-district is main Serving cell, other sub-district determines 6 adjacent areas by the signal strength signal intensity size;

If have the LAYER parameter of 2 sub-districts be 1 and signal strength signal intensity greater than LAYERTHR, then in these two sub-districts signal strong be main Serving cell, weak is first adjacent area, other sub-district determines 5 adjacent areas by the signal strength signal intensity size;

If have 3 or above sub-district LAYER parameter be 1 and signal strength signal intensity greater than LAYERTHR; Then in these sub-districts signal the strongest be main Serving cell; Inferior strong be first adjacent area; Whether remaining is 1 regardless of the LAYER parameter, and whether signal strength signal intensity without exception by signal strength signal intensity size determines 5 adjacent areas greater than the LAYERTHR thresholding.

Thus it is clear that, in the present embodiment, the test data in the grid has been carried out preliminary treatment; That is, for a sub-district, the signal strength values of this sub-district all sampled points in this grid is averaged; With mean value as the signal strength signal intensity of this sub-district in this grid; So, can avoid the analysis deviation problem that causes because of test data is unbalanced, thereby make that the result of coverage evaluating is more accurate.

And, carrying out the signal strength signal intensity mean time, can also earlier abnormal data be weeded out, further improved the precision of coverage evaluating.

For example; There are 6 signal strength datas sub-district 1 in grid 1; Be respectively :-75dB ,-76dB ,-77dB ,-78dB ,-78dB ,-90dB, obvious unusual data-90dB is weeded out, average and obtain-76.8dB remaining 5 data; So the signal strength signal intensity of sub-district 1 in grid 1 is-76.8dB.

Step 105: obtain with a said predetermined number sub-district in the first corresponding propagation model of first sub-district;

Choose corresponding propagation model according to the actual residing wireless environment in first sub-district, for example,, choose following propagation model for urban environment:

L _b＝69.55+26.16lgf-13.83lgh _b-α(h _m)+(44.9-6.55lgh _b)lgd

Wherein:

L _bBe loss;

F is an operating frequency, and unit is MHz, and when the sub-district was the GSM900 sub-district, value was 947, and when the sub-district was the GSM1800 sub-district, value was 1842;

H _bBe the antenna for base station effective depth, unit is m;

h _mBe the height of mobile test platform, unit is m, but value is 3 in the calculating;

α (h _m) be mobile test platform antenna height correction factor, value 3.2 (lg (11.75 * h in the calculating _m)) ²-4.97;

D is the center of grid and the distance between the base station transmit antennas, is specially:

d＝sqrt(sqr((Lon2-Lon1)*cos(Lat2*PI/180)*112)+sqr((Lat2-Lat1)*112))；

Lon1, Lon2 are respectively base station and the residing longitude of grid, and Lat1, Lat2 are respectively base station and the residing latitude of grid.

Step 106:, the parameter of said first propagation model is proofreaied and correct first propagation model after obtaining proofreading and correct according to the distance between the base station of signal strength signal intensity and each grid and said first sub-district of said first sub-district in each grid;

Specifically comprise:

According to signal strength signal intensity, the transmitting power of said first sub-district and the antenna gain of said first sub-district of said first sub-district in each grid, calculate the corresponding loss of each grid: loss=transmitting power+gain-signal strength signal intensity;

According to the distance between the base station of the corresponding loss of each grid and each grid and said first sub-district, said first propagation model is carried out fitting a straight line;

Obtain the slope value and the values of intercept of the straight line that match obtains, with said efficiency value and values of intercept relevant parameter as first propagation model after proofreading and correct.

The concrete grammar of fitting a straight line sees also the back literary composition.

Step 107: the coverage condition that calculates said first sub-district according to first propagation model after the said correction.

Specifically comprise:

For each grid that does not have test data, calculate the corresponding loss of this grid according to distance between the base station of this grid and said first sub-district and said first propagation model;

After the antenna gain addition with the transmitting power of said first sub-district and said first sub-district, deduct the corresponding loss of this grid again, obtain the signal strength signal intensity of said first sub-district in this grid, that is: signal strength signal intensity=transmitting power+gain-loss.

For the grid that test data is arranged, then directly quote test data (with the mean value of all signal strength values of first sub-district in this grid as the signal strength signal intensity of first sub-district in this grid).

After the coverage condition assessment completion to first sub-district, from a said predetermined number sub-district, choose the another one sub-district again, and repeat above-mentioned steps 105～107, so repeatedly, finally obtain the coverage evaluating situation of all sub-districts.

Below provide the object lesson of step 106 cathetus match.

According to drive test data, the individual loss that the grid of test data is arranged of difference calculation plot 1 to k (k＞2):

PLi＝Pt+Gt-Pri

Wherein, PLi be i (i=1,2 ..., k) the corresponding loss of individual grid, Pt is the transmitting power of sub-district 1, Gt is the antenna gain of sub-district 1, Pri be i (i=1,2 ..., the k) signal strength signal intensity of individual grid.

Propagation model is reduced to: PLi=Algdi+B (di be grid i (i=1,2 ..., k) and the distance between the base station, A, B want parameter undetermined)

Order $L=\underset{i=1}{\overset{k}{\mathrm{\Σ}}}{(\mathrm{PLi}-\mathrm{Algdi}-B)}^2$

What following formula L represented is the loss of k grid reality and the quadratic sum of the difference of the loss of calculating with PLi=Algdi-B.

To A, B differentiate, when derivative is 0, just can obtain to make L to reach A, the B value of minimum (difference that is exactly actual value PLi=Pt+Gt-Pri and PLi=Algdi+B calculated value reaches minimum) with L.

Concrete derivation is following:

, obtain A, B differentiate with L

$\frac{\mathrm{dL}}{\mathrm{dA}}=\underset{i=1}{\overset{k}{\mathrm{\Σ}}}(2(\mathrm{PLi}-\mathrm{Algdi}-B)\·(-\mathrm{lgdi})$

$=-2\underset{i=1}{\overset{k}{\mathrm{\Σ}}}(\mathrm{lgdi}\·\mathrm{PLi}-{\mathrm{Alg}}^2\mathrm{di}-B\·\mathrm{lgdi})$

$\frac{\mathrm{dL}}{\mathrm{dB}}=\underset{i=1}{\overset{k}{\mathrm{\Σ}}}(2(\mathrm{PLi}-\mathrm{Algdi}-B)\·(-1)$

$=-2\underset{i=1}{\overset{k}{\mathrm{\Σ}}}(\mathrm{PLi}-\mathrm{Algdi}-B)$

Order $\frac{\mathrm{DL}}{\mathrm{DA}}=0,$ $\frac{\mathrm{DL}}{\mathrm{DB}}=0,$ Obtain

$\underset{i=1}{\overset{k}{\mathrm{\Σ}}}(\mathrm{lgdi}\·\mathrm{PLi}-{\mathrm{Alg}}^2\mathrm{di}-B\·\mathrm{lgdi})=0---\left(1\right)$

$\underset{i=1}{\overset{k}{\mathrm{\Σ}}}(\mathrm{PLi}-\mathrm{Algdi}-B)=0---\left(2\right)$

Obtain by (2)

$B=\frac{\underset{i=1}{\overset{k}{\mathrm{\Σ}}}(\mathrm{PLi}-\mathrm{Algdi})}{k}---\left(3\right)$

Obtain by (1)

$\underset{i=1}{\overset{k}{\mathrm{\Σ}}}(\mathrm{lgdi}\·\mathrm{PLi})-A\·\underset{i=1}{\overset{k}{\mathrm{\Σ}}}\left({\lg }^2\mathrm{di}\right)-B\underset{i=1}{\overset{k}{\mathrm{\Σ}}}\left(\mathrm{lgdi}\right)=0---\left(4\right)$

(3) bringing (4) into obtains

$k\·\underset{i=1}{\overset{k}{\mathrm{\Σ}}}(\mathrm{lgdi}\·\mathrm{PLi})-k\·A\·\underset{i=1}{\overset{k}{\mathrm{\Σ}}}\left({\lg }^2\mathrm{di}\right)-\underset{i=1}{\overset{k}{\mathrm{\Σ}}}\left(\mathrm{PLi}\right)\·\underset{i=1}{\overset{k}{\mathrm{\Σ}}}\left(\mathrm{lgdi}\right)+A\·\underset{i=1}{\overset{k}{\mathrm{\Σ}}}\mathrm{lgdi}\·\underset{i=1}{\overset{k}{\mathrm{\Σ}}}\mathrm{lgdi}=0$

Obtain thus:

$A=\frac{k\·\underset{i=1}{\overset{k}{\mathrm{\Σ}}}(\mathrm{lgdi}\·\mathrm{PLi})-\underset{i=1}{\overset{k}{\mathrm{\Σ}}}\left(\mathrm{PLi}\right)\·\underset{i=1}{\overset{k}{\mathrm{\Σ}}}\left(\mathrm{lgdi}\right)}{k\·\underset{i=1}{\overset{k}{\mathrm{\Σ}}}\left({\lg }^2\mathrm{di}\right)-\underset{i=1}{\overset{k}{\mathrm{\Σ}}}\mathrm{lgdi}\·\underset{i=1}{\overset{k}{\mathrm{\Σ}}}\mathrm{lgdi}}$

$B=\frac{\underset{i=1}{\overset{k}{\mathrm{\Σ}}}{\lg }^2\mathrm{di}\·\underset{i=1}{\overset{k}{\mathrm{\Σ}}}\mathrm{PLi}-\underset{i=1}{\overset{k}{\mathrm{\Σ}}}\mathrm{lgdi}\·\underset{i=1}{\overset{k}{\mathrm{\Σ}}}(\mathrm{PLi}\·\mathrm{lgdi})}{k\·\underset{i=1}{\overset{k}{\mathrm{\Σ}}}\left({\lg }^2\mathrm{di}\right)-\underset{i=1}{\overset{k}{\mathrm{\Σ}}}\mathrm{lgdi}\·\underset{i=1}{\overset{k}{\mathrm{\Σ}}}\mathrm{lgdi}}$

After obtaining the A, B value of sub-district,, just can calculate loss: loss=Algd+B (d is the distance between grid and the antenna for base station) according to following formula for the grid that does not have test data.

Below introduce the device of realizing said method.

With reference to Fig. 2, the coverage evaluating device of the wireless network of the embodiment of the invention comprises: data aggregation module 10, signal strength signal intensity acquisition module 20, propagation model acquisition module 30, propagation model revision module 40 and coverage evaluating module 50, wherein:

Data aggregation module 10; Be used to obtain the signal strength information that comprises the sub-district and the test data of corresponding geographical location information; According to said geographical location information; The signal strength information of said sub-district is converged in the corresponding grid, and wherein, said grid is according to the geographical position zone to be assessed of said wireless network to be divided to obtain.

Signal strength signal intensity acquisition module 20 is used for for the grid that test data is arranged, and obtains the signal strength signal intensity of a predetermined number sub-district in this grid, is specially:

Choose interior main Serving cell of this grid and adjacent sub-district as a said predetermined number sub-district;

For each sub-district of choosing, with the mean value of all signal strength values of this sub-district in this grid as the signal strength signal intensity of this sub-district in this grid.

Propagation model acquisition module 30 is used for obtaining first propagation model corresponding with first sub-district of a said predetermined number sub-district.

Propagation model revision module 40; Be used for according to the distance between the base station of signal strength signal intensity and each grid and said first sub-district of said first sub-district in each grid; Parameter to said first propagation model is proofreaied and correct, and first propagation model after obtaining proofreading and correct is specially:

According to signal strength signal intensity, the transmitting power of said first sub-district and the antenna gain of said first sub-district of said first sub-district in each grid, calculate the corresponding loss of each grid;

According to the distance between the base station of the corresponding loss of each grid and each grid and said first sub-district, said first propagation model is carried out fitting a straight line;

Obtain the slope value and the values of intercept of the straight line that match obtains, with said efficiency value and values of intercept relevant parameter as first propagation model after proofreading and correct.

Coverage evaluating module 50 is used for calculating according to first propagation model after the said correction coverage condition of said first sub-district, is specially:

For each grid that does not have test data, calculate the corresponding loss of this grid according to distance between the base station of this grid and said first sub-district and said first propagation model;

After the antenna gain addition with the transmitting power of said first sub-district and said first sub-district, deduct the corresponding loss of this grid again, obtain the signal strength signal intensity of said first sub-district in this grid.

Wherein, the distance between grid and the base station is the distance between the transmitting antenna of center and base station of grid.

In sum; Embodiments of the invention are with the corresponding propagation model in each sub-district; Utilize frequency sweep, the drive test test data of existing network to come the propagation model of each sub-district of existing network is carried out from dynamic(al) correction; Make propagation model truly reflect the overlay environment characteristic of this sub-district, the propagation model kind in the network has been refine to cell level, all there is an own distinctive cover propagation model parameter each sub-district.The embodiment of the invention is also treated assessment area and has been carried out the rasterizing division, and the test data in the grid has been carried out preliminary treatment, promptly; For a sub-district; The signal strength values of this sub-district all sampled points in this grid is averaged, mean value is as the signal strength signal intensity of this sub-district in this grid, like this; Can avoid the analysis deviation problem that causes because of test data is unbalanced, thereby make that the result of coverage evaluating is more accurate.In addition, divide the rasterizing coverage condition that can also obtain the whole network, be beneficial to carrying out of work such as follow-up rolling website planning, lane place planning, traffic distribution through rasterizing.

Should be noted that at last; Above embodiment is only unrestricted in order to technical scheme of the present invention to be described; Those of ordinary skill in the art is to be understood that; Can make amendment or be equal to replacement technical scheme of the present invention, and not break away from the spirit of technical scheme of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.

Claims (10)

1. the coverage evaluating method of a wireless network is characterized in that, comprising:

Obtain the signal strength information that comprises the sub-district and the test data of corresponding geographical location information; According to said geographical location information; The signal strength information of said sub-district is converged in the corresponding grid; Wherein, said grid is according to the geographical position zone to be assessed of said wireless network to be divided to obtain;

For the grid that test data is arranged, obtain the signal strength signal intensity of a predetermined number sub-district in this grid;

Obtain with a said predetermined number sub-district in the first corresponding propagation model of first sub-district;

According to the distance between the base station of signal strength signal intensity and each grid and said first sub-district of said first sub-district in each grid, the parameter of said first propagation model is proofreaied and correct first propagation model after obtaining proofreading and correct;

Calculate the coverage condition of said first sub-district according to first propagation model after the said correction.

2. coverage evaluating method as claimed in claim 1 is characterized in that, the said signal strength signal intensity of a predetermined number sub-district in this grid of obtaining comprises:

Choose interior main Serving cell of this grid and adjacent sub-district as a said predetermined number sub-district;

For each sub-district of choosing, with the mean value of all signal strength values of this sub-district in this grid as the signal strength signal intensity of this sub-district in this grid.

3. coverage evaluating method as claimed in claim 1; It is characterized in that; Saidly the parameter of said first propagation model is proofreaied and correct, comprising according to the distance between the base station of signal strength signal intensity and each grid and said first sub-district of said first sub-district in each grid:

According to signal strength signal intensity, the transmitting power of said first sub-district and the antenna gain of said first sub-district of said first sub-district in each grid, calculate the corresponding loss of each grid;

According to the distance between the base station of the corresponding loss of each grid and each grid and said first sub-district, said first propagation model is carried out fitting a straight line;

Obtain the slope value and the values of intercept of the straight line that match obtains, with said efficiency value and values of intercept relevant parameter as first propagation model after proofreading and correct.

4. coverage evaluating method as claimed in claim 1 is characterized in that, saidly calculates the coverage condition of said first sub-district according to first propagation model after the said correction, comprising:

For each grid that does not have test data, calculate the corresponding loss of this grid according to distance between the base station of this grid and said first sub-district and said first propagation model;

After the antenna gain addition with the transmitting power of said first sub-district and said first sub-district, deduct the corresponding loss of this grid again, obtain the signal strength signal intensity of said first sub-district in this grid.

5. like claim 1 or 4 described coverage evaluating methods, it is characterized in that:

Distance between grid and the base station is the distance between the transmitting antenna of center and base station of grid.

6. the coverage evaluating device of a wireless network is characterized in that, comprising:

Data aggregation module; Be used to obtain the signal strength information that comprises the sub-district and the test data of corresponding geographical location information; According to said geographical location information; The signal strength information of said sub-district is converged in the corresponding grid, and wherein, said grid is according to the geographical position zone to be assessed of said wireless network to be divided to obtain;

The signal strength signal intensity acquisition module is used for for the grid that test data is arranged, and obtains the signal strength signal intensity of a predetermined number sub-district in this grid;

The propagation model acquisition module is used for obtaining first propagation model corresponding with first sub-district of a said predetermined number sub-district;

The propagation model revision module is used for the parameter of said first propagation model being proofreaied and correct first propagation model after obtaining proofreading and correct according to the distance between the base station of signal strength signal intensity and each grid and said first sub-district of said first sub-district in each grid;

The coverage evaluating module is used for calculating according to first propagation model after the said correction coverage condition of said first sub-district.

7. coverage evaluating device as claimed in claim 6 is characterized in that, said signal strength signal intensity acquisition module is further used for:

Choose interior main Serving cell of this grid and adjacent sub-district as a said predetermined number sub-district;

For each sub-district of choosing, with the mean value of all signal strength values of this sub-district in this grid as the signal strength signal intensity of this sub-district in this grid.

8. coverage evaluating device as claimed in claim 6 is characterized in that, said propagation model revision module is further used for:

According to signal strength signal intensity, the transmitting power of said first sub-district and the antenna gain of said first sub-district of said first sub-district in each grid, calculate the corresponding loss of each grid;

According to the distance between the base station of the corresponding loss of each grid and each grid and said first sub-district, said first propagation model is carried out fitting a straight line;

Obtain the slope value and the values of intercept of the straight line that match obtains, with said efficiency value and values of intercept relevant parameter as first propagation model after proofreading and correct.

9. coverage evaluating device as claimed in claim 6 is characterized in that, said coverage evaluating module is further used for:

For each grid that does not have test data, calculate the corresponding loss of this grid according to distance between the base station of this grid and said first sub-district and said first propagation model;

After the antenna gain addition with the transmitting power of said first sub-district and said first sub-district, deduct the corresponding loss of this grid again, obtain the signal strength signal intensity of said first sub-district in this grid.

10. like claim 6 or 9 described coverage evaluating devices, it is characterized in that:

Distance between grid and the base station is the distance between the transmitting antenna of center and base station of grid.

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