CN104602248A - Physical cellular identification assessment method and physical cellular identification assessment network - Google Patents

Abstract

The embodiment of the invention provides a physical cellular identification assessment method and a physical cellular identification assessment network. The method and the network are used for a long term evolution (LTE) network. The method comprises the steps of: establishing a base station list and a cell list; according to the base station list, the cell list and programmable communication interface (PCI) distribution in planned physical cells, distributing PCIs into each cell; rasterizing an area covered by the LTE network to form a plurality of grids, wherein a cell can be accommodated in each grid; acquiring a PCI model X matrix of each grid; and according to the PCI model X matrix, assessing of overall PCI performance of the LTE network. By using the rasterizing method, the overall network is rasterized, the jamming intensity of each grid can be calculated, and the overall PCI performance of the LTE network is calculated, so that a PCI planning effect can be subject to quantitative evaluation, an unreasonable PCI distribution area can be accurately guided, and the investment of a large amount of labor, materials, resources and time is avoided.

Description

A kind of method and network assessing Physical Cell Identifier

Technical field

The present invention relates to communication network technology, refer to a kind of method and the network of assessing Physical Cell Identifier especially.

Background technology

In LTE system, the combination of orthogonal sequence and pseudo random sequence that physical district ID (PCI, Physical Cell ID) is corresponding, LTE system defines 504 PCI, for avoiding presence of intercell interference demand fulfillment: do not conflict, any two adjacent co-frequency cells do not use same PCI; Do not obscure, any two co-frequency cells can not be had in all adjacent areas of a community to use identical PCI.In addition, the public reference signal of PCI and community is bound, PCI value directly determines the time-frequency location of reference signal, if the value of two-port network PCI mould 3 is equal, then the time-frequency location of reference signal is identical, if the value of one port network PCI mould 6 is equal, then the time-frequency location of reference signal is identical, the employing two-port network that macro base station is more.

Prior art focuses mostly in the distribution and planning of PCI about the research of PCI.After PCI distributes, during by carrying out the network optimization to existing LTE network, sweep generator and test terminal equipment is adopted to carry out dependent evaluation.PCI is carried out for LTE overall network and plans Performance Evaluation, need to test region-wide the drawing in the net of covering, first find and be disturbed region, again combine the PCI distribution planned and assess in detail.The detailed assessment in PCI some areas is confined to certain several base station mostly, the network performance indexes such as RSRP and SINR of Ji Zhuce community, neighbor cell are drawn by sweep generator measurement, by test terminal equipment visual test throughput, if find that RSRP performance is more excellent, namely whether SINR poor-performing need to consider for caused by the mould 3 of neighbor cell disturbs.As shown in Figure 1, the PCI configuration of community A, community B is respectively 148 and 154, the juncture area between website A (PCI154) and website B (PCI148) can be found, as shown in drive test curve in top in Fig. 1, RSRP is very good, but SINR very poor (<5), after the adjustment angle of pitch of antenna and azimuth, problem still exists.Change the PCI148 of website B into PCI147, drive test result is as shown in drive test curve following in Fig. 1, and SINR goes to 25 to 30 well, and reason is PCI148Mod3=PCI154Mod3 mainly, causes the position of reference signal identical, to cause between reference signal caused by interference.The method is suitable for LTE local coverage area, assesses obviously inapplicable for the FR PCI of LTE existing network.

There are the following problems for prior art: can only carry out network PCI analysis and assessment again after LTE network is built up, and needs a large amount of human and material resources, financial resources and need the long period, cannot find PCI planning problem in advance; The PCI that cannot assess overall LTE network plans effect, can only find that irrational PCI distributes by rule of thumb for certain several specific station point of local; The planning effect of PCI can not be carried out quantitative evaluation, whether the distribution of PCI has mould 3 to disturb experience and the drive test result of dependence optimization personnel completely.

Summary of the invention

The technical problem to be solved in the present invention is to provide a kind of method and the network of assessing Physical Cell Identifier, and the PCI that cannot assess overall LTE network plans effect, can only find the defect that unreasonable PCI distributes by rule of thumb for several base station, local.

For solving the problems of the technologies described above, embodiments of the invention provide a kind of method assessing Physical Cell Identifier, and be applied to LTE network, method comprises: structure station list and cell list; According to described station list, cell list and planned physical area indicate PCI distribution, PCI is assigned in each community; The overlay area of rasterizing LTE network forms multiple grid, allows accommodating community in each grid; Obtain the PCI mould X matrix of grid described in each; The PCI overall performance of LTE network according to described PCI mould X matrix valuation.

In described method, structure station list and cell list comprise: gather the base station information table of LTE network, the azimuth of described base station information table record base station IDs, community ID, latitude and longitude of base station and community; Station list and cell list according to the data configuration of described base station information table record.

In described method, the overlay area of rasterizing LTE network also comprises the overlapping coverage condition of prediction LTE network before forming multiple grid, specifically comprise: import map resource; Import the parameter of LTE network; The parameter of wireless environment is set; Arrange cell edge field intensity, cell edge field intensity is the field intensity at the covering edge of prediction moment community; Overlap according to the parameter of described map resource, LTE network, the parameter of wireless environment and cell edge field intensity prediction LTE network covers.

In described method, the PCI mould X matrix obtaining grid described in each specifically comprises: for a grid, the main Serving cell of selected described grid; Interference threshold is set, counts candidate interfered cell according to described interference threshold: the PCI mould X result obtaining described main Serving cell, and, obtain the mould X result of each candidate interfered cell; The candidate interfered cell that in statistics grid, PCI mould X result that is all and main Serving cell is consistent is as formal interfered cell; According to the 1*N matrix of the received signal strength structure PCI mould X of main Serving cell and interfered cell.

In described method, 1*N matrix according to the received signal strength structure PCI mould X of main Serving cell and interfered cell specifically comprises: the first row first row element of 1*N matrix is the received signal strength of main Serving cell, and all the other column elements are received signal strengths of interfered cell.

In described method, according to described PCI mould X matrix valuation, the PCI overall performance of LTE network specifically comprises: in each grid, goes out the grid interference strength of interfered cell for the interference of main Serving cell according to PCI mould X matrix computations; Cumulative grid interference strength described in each obtain interference overall strength D in LTE network as described PCI overall performance for assessment of.

In described method, grid interference strength computing formula is: wherein, a ₁₁disturbed main Serving cell, j=2,3 ..., n, n-1 are the community numbers that in grid, all mould X values are identical with main Serving cell mould X value, a _1jfor jth-1 interfered cell, T is interference threshold.

A kind of LTE network, comprise PCI capability evaluating device, PCI overall performance comprises: lists construction unit, for constructing station list and cell list; Physical area indicate allocation units, for according to described station list, cell list and planned physical area indicate PCI distribution, PCI is corresponded in each community; Rasterizing unit, for the overlay area of rasterizing LTE network, forms multiple grid, allows accommodating community in each grid; Matrix unit, for obtaining the PCI mould X matrix of each grid; Performance Evaluation unit, for the PCI overall performance of LTE network according to PCI mould X matrix valuation.

In described LTE network, matrix unit comprises: main Serving cell module, for for a grid, selectes the main Serving cell of described grid; Interference threshold module, for arranging interference threshold, counts candidate interfered cell according to described interference threshold: mould X object module, for obtaining the PCI mould X result of main Serving cell, and, obtain the PCI mould X result of each candidate interfered cell; Interfered cell module, for adding up all in grid and that main Serving cell PCI mould X result is consistent candidate interfered cell as formal interfered cell; Matrix generation module, for the 1*N matrix of the received signal strength structure PCI mould X according to main Serving cell and interfered cell.

In described LTE network, matrix unit comprises: grid interference strength computing module, for according to formula calculate the grid interference strength of this grid, wherein, a ₁₁disturbed main Serving cell, j=2,3 ..., n, n-1 are the community numbers that in grid, all mould X values are identical with main Serving cell mould X value, a _1jfor jth-1 interfered cell, T is interference threshold.

The beneficial effect of technique scheme of the present invention is as follows: adopt the method for rasterizing first by whole network rasterizing, and calculate the interference strength of single grid, and then calculate the PCI overall performance of LTE network, realize quantitative evaluation PCI and plan effect, so accurately can instruct PCI irrational distribution region, avoid the input of a large amount of human and material resources, resource and time etc.

Accompanying drawing explanation

Fig. 1 represents that prior art distributes schematic diagram LTE network being carried out after PCI to performance evaluation;

Fig. 2 represents the schematic diagram be distributed in for every 3 RE reference signal on frequency domain of reference signal;

Fig. 3 represents the distribution map of the reference signal of the community of PCIMod3=0;

Fig. 4 represents the distribution map of the reference signal of the community of PCIMod3=1;

Fig. 5 represents the distribution map of the reference signal of the community of PCIMod3=2;

Fig. 6 represents a kind of schematic flow sheet assessing the method for Physical Cell Identifier PCI.

Embodiment

For making the technical problem to be solved in the present invention, technical scheme and advantage clearly, be described in detail below in conjunction with the accompanying drawings and the specific embodiments.

The effect that grid quantitative evaluation PCI plans is adopted in the present invention.

It is 0 to 503 that the physical area of LTE network indicates (PCI, Physical Cell ID) span, totally 504 PCI values.Each LTE community needs to have a PCI value, and to be different from adjacent cell, terminal, when accessing LTE network, can judge and each physical area of access according to the value of PCI.

PCI needs multiplexing reason: the physical area of LTE network is very many, Physical Cell Identifier PCI only has 504, multiplexing PCI must be needed, therefore need to ensure to adopt the interval, physical area of identical PCI enough far away-namely multiplex distance is enough large, avoids terminal generation when accessing to obscure and interference.

The effect of public reference signal: effect is in the lte networks measurement and the restituted signal of channel, first LTE network demodulates public reference signal, ability demodulated data signal, and receive measure signal intensity (RSRP), a series of relevant parameters such as signal quality (RSRQ) and Signal to Interference plus Noise Ratio (SINR).Public reference signal, once be interfered, can cause LTE network to produce deviation for the demodulation of signal with measurement.

The position of public reference signal: for ease of understanding, for 2 antenna ports, single antenna port, four antenna ports and 2 antenna ports are similar.According to the running time-frequency resource grid of LTE network, with conventional CP, 20MHz bandwidth, 1ms subframe is example, total 1200*14 RE, the elementary cell that public reference signal takies is RE, is distributed in whole 20MHz bandwidth, for 2*2MIMO, 2 antenna ports, as shown in Figure 2, being distributed on frequency domain of reference signal is every 3 RE reference signal, comprising: R0 reference signal, R1 reference signal.As shown in Figure 2, for the reference signal resource distribution map of reference signal PCI Mod3=0, the longitudinal axis is frequency, transverse axis is the time, found by comparison diagram 2, Fig. 3, Fig. 4 and Fig. 5, the binding positions of PCI and reference signal, the reference signal-to-interference to this community is minimum, then wish that the reference signal position of adjacent cell is different with it, and then require that the residual value of the PCI of this community and the PCIMod3 of adjacent cell is unequal.

The relation of public reference signal and PCI: public reference signal sequence is n _sbe the slot index in a radio frames, l is the OFDM symbol sequence in a time slot, will be mapped to complex value modulation symbol in the following manner on as time slot n _sreference symbol on middle antenna port p wherein: k=6m+ (v+v _shift) mod6

$l=\left\{\begin{array}{cc}0,N_{\mathrm{symb}}^{\mathrm{DL}}-3& p\&Element;\left\{\mathrm{0,1}\right\}\\ 1& p\&Element;\left\{\mathrm{2,3}\right\}\end{array}\right.$

$m=\mathrm{0,1},\&CenterDot;\&CenterDot;\&CenterDot;,2N_{\mathrm{RB}}^{\mathrm{DL}}-1,m^{\&prime;}=m+N_{\mathrm{RB}}^{\max ,\mathrm{DL}}-N_{\mathrm{RB}}^{\mathrm{DL}},$ the OFDM symbol number of a descending time slot, represent the number of a descending time slot RB, it is the RB number under the configuration of maximum downstream transmission bandwidth.

Variable v and V _shiftdefine the position of different reference signal on frequency domain, wherein

The frequency offset that community is proprietary in ID be community (cell) ID.

In one time slot, any antenna port is used as the resource particle (k, l) of transmission of reference signals, in identical time slot, any transmission can not be carried out on other antenna ports, and be set to 0.

In conjunction with the relation of the reference signal mapping position defined in above agreement and PCI, the reference signal resource distribution of reference signal PCIMod3=0 as shown in Figure 3, as shown in Figure 4, the reference signal resource distribution of reference signal PCI Mod3=2 as shown in Figure 5 in the reference signal resource distribution of reference signal PCI Mod3=1; In figure, the longitudinal axis is frequency, transverse axis is the time, by contrasting several graph discovery, the value of PCI and the position of reference signal are tightly bound, reference signal-to-interference to this community is minimum, then wish that the reference signal position of its next-door neighbour community is different with it, and then require that the PCI Mod3 value of the PCI Mod3 value of this community and adjacent cell is unequal.

The embodiment of the present invention provides a kind of method assessing Physical Cell Identifier PCI, as shown in Figure 2, is applied in LTE network,

Method as shown in Figure 6, comprising:

Step 61, structure station list and cell list;

Step 62, according to described station list, cell list and planned physical area indicate PCI distribution, PCI is assigned in each community;

Step 63, the overlay area of rasterizing LTE network forms multiple grid, allows accommodating community in each grid;

Step 64, obtains the PCI mould X matrix of grid described in each;

Step 65, the PCI overall performance of LTE network according to described PCI mould X matrix valuation.

The technology provided is provided, adopt the method for rasterizing first by whole network rasterizing, and calculate the interference strength of single grid, and then calculate the PCI overall performance of LTE network, realize the effect that quantitative evaluation PCI plans, accurately can determine PCI irrational distribution region, avoid the input of a large amount of human and material resources, resource and time etc.

X is X=3 normally.

Base station information table comprises the azimuth of base station IDs, community ID, latitude and longitude of base station and community.In a preferred embodiment, structure station list and cell list comprise:

Gather the base station information table of LTE network, the azimuth of described base station information table record base station IDs, community ID, latitude and longitude of base station and community;

Station list and cell list according to the data configuration of described base station information table record.

In a preferred embodiment, the overlay area of rasterizing LTE network also comprises the overlapping coverage condition of prediction LTE network before forming multiple grid, specifically comprise:

Import map resource;

Import the parameter of LTE network;

The parameter of wireless environment is set;

Arrange cell edge field intensity, cell edge field intensity is the field intensity at the covering edge of prediction moment community;

Overlap according to the parameter of described map resource, LTE network, the parameter of wireless environment and cell edge field intensity prediction LTE network covers.

In a preferred embodiment, rasterizing LTE network overlay area process comprises: according to assessment fine degree setting lattice dimensions size; Add up each grid Nei Ge community wireless performance parameter (RSRP, SINR etc.).Cell edge field intensity is defined as the covering cell-edge of the community when predicting, cell edge field intensity can carry out relevant setting in conjunction with actual needs, as arranged RSRP for-100dBm/-110dBm etc., but be not limited to this, the less then overlapping area coverage of cell-edge is larger.

Overlapping for LTE network coverage prediction result is carried out rasterizing process, rasterizing precision is come finally to determine according to demand, as available 5 meters * 5 meters, 20 meters * 20 meters are waited grid to process, the less then processing accuracy of grid division is more accurate, processing time is longer comparatively speaking, and then adds up each grid Nei Ge community wireless performance parameter.

The process of assessment LTE network PCI overall performance for: add up the mould X matrix corresponding to each grid, then calculate the interference strength of each mould X matrix for the main Serving cell of this grid; Finally by all grids, mould X matrix is added for the interference strength of the main Serving cell of this grid, tries to achieve the PCI annoyance level of whole network.X is 3, mould X matrixes specifically mould 3 matrix specifically.

In a preferred embodiment, the PCI mould X matrix obtaining grid described in each specifically comprises:

For a grid, the main Serving cell of selected described grid;

Interference threshold is set, counts candidate interfered cell according to described interference threshold:

Obtain the PCI mould X result of described main Serving cell, and, obtain the mould X result of each candidate interfered cell;

The candidate interfered cell that in statistics grid, PCI mould X result that is all and main Serving cell is consistent is as formal interfered cell;

According to the 1*N matrix of the received signal strength structure PCI mould X of main Serving cell and interfered cell.

In a preferred embodiment, specifically comprise according to the 1*N matrix of the received signal strength structure PCI mould X of main Serving cell and interfered cell:

The first row first row element of 1*N matrix is the received signal strength of main Serving cell, and all the other column elements are received signal strengths of interfered cell.

In an application scenarios, PCI mould 3 result of the main Serving cell in grid is 0, and the RSRP of main Serving cell is-69, and arranging interference threshold is 30dB;

Have the candidate interfered cell that 3 PCI moulds 3 are 0 in statistics grid, RSRP is respectively-99 ,-70 ,-92, then mould 3 matrix formed is [-69 ,-99 ,-70 ,-92], and the first row first row element of PCI mould 3 matrix is main serving cell parameters.

In a preferred embodiment, according to described PCI mould X matrix valuation, the PCI overall performance of LTE network specifically comprises:

In each grid, go out the grid interference strength of interfered cell for the interference of main Serving cell according to PCI mould X matrix computations;

Cumulative grid interference strength described in each obtains interference overall strength D in LTE network as described PCI overall performance, and described PCI overall performance is for assessment of LTE network.

In a preferred embodiment, grid interference strength computing formula is:

Wherein, a ₁₁disturbed main Serving cell, j=2,3 ..., n, n-1 are the community numbers that in grid, all PCI mould X values are identical with main Serving cell PCI mould X value, a _1jfor jth-1 interfered cell, T is interference threshold.Also can to adopt or other wireless performance indexes substitute RSRP.

In an application scenarios, if PCI mould 3 interference strength of i-th grid is Pi, mould 3 interference matrix Ai is (a _1j) _{1 × n}, wherein a ₁₁for disturbed main Serving cell, j=2,3 ..., n, n-1 are the community number of all communities PCI mould 3 value and main Serving cell mould 3 value in this grid, a _1jfor jth-1 mould 3 interfered cell.Arranging PCI mould 3 interference threshold is T, then PCI mould 3 interference strength

Obtain PCI mould 3 interference strength of each grid, then the Whole PC I mould 3 adding up LTE network disturbs overall strength (PCI mould 3 interference strength of all grids) to be w is the number of grid, and the PCI mould 3 of the value less LTE network entirety of D conflicts less, and overall performance of network is better.

If interference threshold T=10dB, PCI mould 3 interference matrix A _i=[-64 ,-65 ,-66 ,-71 ,-73], then try to achieve PCI mould 3 interference strength Pi=17.507.It should be noted that, when contrasting two or more LTE network PCI interference, only under the condition that interference threshold T value is equal, just there is stronger comparativity, owing to introducing T in interference strength assessment formula, the absolute value of Evaluation result is thus gone not possess stronger comparison when T is different.

In a preferred embodiment, interference overall strength D is carried out segmentation display by layer display, identifies the region of PCI serious interference.Comprise: set several segment value, different segmentations represents different segment values by different colors.

In an application scenarios, apply the technology that each embodiment provides, comprising:

Step 1, gather the base station information table of LTE network, base station information table comprises: the azimuth of base station IDs, community ID, latitude and longitude of base station and community.

Step 2, structure station list and cell list, set up the list of all base stations of LTE network and the list of all communities according to described base station information table.

Step 3, structure community, distributes according to described cell list and the PCI that planned, is corresponded in each community by PCI.

Step 4, prediction LTE overlap covers, and as shown in Figure 2, imports map resource, imports existing network parameter, arrange wireless environment, arrange cell edge field intensity, carries out the overlapping coverage prediction of LTE network according to relevant setting.

Step 5, the overlay area of rasterizing LTE network.Overlapping for LTE coverage prediction result is carried out rasterizing process, rasterizing precision is come finally to determine according to demand, as available 5 meters * 5 meters, 20 meters of * 20 meters of grids process, the less then processing accuracy of grid division is more accurate, processing time is longer comparatively speaking, and then adds up each grid Nei Ge community wireless performance parameter.

Step 6, structure PCI mould 3 matrix.

In the LTE overlay area of rasterizing, can adopt the main Serving cell that the wireless index such as field intensity (RSRP), Signal to Interference plus Noise Ratio (SINR) is determined in each grid, the community that in same grid, RSRP signal is best as chosen is as main Serving cell; The interference threshold of PCI mould 3 is set, adds up community within the scope of interference threshold as interfered cell; The PCI of the main Serving cell of each grid is carried out mould 3 process, finally draw certain value in 0/,1/2 three numerical value.

The PCI of each interfered cell is carried out PCI mould 3 process, select the interfered cell consistent with main Serving cell mould 3 result as PCI mould 3 entry of a matrix element, the RSRP numerical value of main Serving cell is taken as matrix the first row first row element, forms 1*N matrix.

Step 7, assessment LTE network PCI overall performance.Add up mould 3 matrix of each grid, and calculate the interference of each mould 3 matrix for the main Serving cell of this grid.Specific algorithm is as follows: the mould 3 interference matrix A of i-th grid _ifor (a _1j) _{1 × n}, wherein a ₁₁for disturbed main Serving cell, n-1 is the community number of all communities mould 3 value and main Serving cell mould 3 value in this grid, and j is j=1,2...n, a _1jfor jth-1 (j ≠ 1) individual mould 3 interfered cell, arranging PCI mould 3 interference threshold is T, then PCI mould 3 interference strength of i-th grid is P _i, $P_i=\underset{j=2}{\overset{n}{\mathrm{\&Sigma;}}}{10}^{\left(\frac{(a_{1j}-a_{11})+T}{10}\right)},$

Obtain PCI mould 3 interference strength of each grid, then the Whole PC I mould 3 adding up LTE network disturbs overall strength (PCI mould 3 interference strength of all grids) the PCI mould 3 of the value less LTE overall network of D conflicts less, and overall performance of network is better.

Without loss of generality, if T=10dB, PCI mould 3 interference matrix is A _i=[-64 ,-65 ,-66 ,-71 ,-73], then try to achieve PCI mould 3 interference strength P _i=17.507.It should be noted that, when contrasting two or more LTE network PCI interference, only under the condition that interference threshold T value is equal, just there is stronger comparativity, owing to introducing the T factor in interference strength assessment formula, the absolute value of Evaluation result is thus gone not possess stronger comparison when T is different.

Step 8, after trying to achieve the PCI annoyance level of whole network, PCI annoyance level can be carried out segmentation display by layer display, and by presenting result intuitively by the region recognition of PCI serious interference out, emphasis carries out PCI optimization.

The embodiment of the present invention provides a kind of LTE network, comprises PCI capability evaluating device, and described PCI overall performance comprises:

Lists construction unit, for constructing station list and cell list;

Physical area indicate allocation units, for according to described station list, cell list and planned physical area indicate PCI distribution, PCI is corresponded in each community;

Rasterizing unit, for the overlay area of rasterizing LTE network, forms multiple grid, allows accommodating community in each grid;

Matrix unit, for obtaining the PCI mould X matrix of each grid;

Performance Evaluation unit, for the PCI overall performance of LTE network according to PCI mould X matrix valuation.

In a preferred embodiment, matrix unit comprises:

Main Serving cell module, for for a grid, selectes the main Serving cell of described grid;

Interference threshold module, for arranging interference threshold, counts candidate interfered cell according to described interference threshold:

Mould X object module, for obtaining the PCI mould X result of main Serving cell, and, obtain the PCI mould X result of each candidate interfered cell;

Interfered cell module, for adding up all in grid and that main Serving cell PCI mould X result is consistent candidate interfered cell as formal interfered cell;

Matrix generation module, for the 1*N matrix of the received signal strength structure PCI mould X according to main Serving cell and interfered cell.

In a preferred embodiment, matrix unit comprises:

Grid interference strength computing module, for according to formula calculate the grid interference strength of this grid, wherein, a ₁₁disturbed main Serving cell, j=2,3 ..., n, n-1 are the community numbers that in grid, all mould X values are identical with main Serving cell mould X value, a _1jfor jth-1 interfered cell, T is interference threshold.

Each grid interference strength cumulative obtains interference overall strength D in LTE network as described PCI overall performance.

After trying to achieve the PCI annoyance level of whole network, PCI annoyance level can be carried out segmentation display by layer display, and by presenting result intuitively by the region recognition of PCI serious interference out, emphasis carries out PCI optimization

Advantage after employing this programme is: adopt the method for rasterizing first by whole network rasterizing, and calculate the interference strength of single grid, and then calculate the PCI overall performance of LTE network, realize quantitative evaluation PCI and plan effect, so accurately can determine PCI irrational distribution region, avoid and drop into a large amount of human and material resources, resource and time etc.

The above is the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the prerequisite not departing from principle of the present invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.

Claims (10)

1. assess a method for Physical Cell Identifier, be applied to LTE network, it is characterized in that, method comprises:

Structure station list and cell list;

According to described station list, cell list and planned physical area indicate PCI distribution, PCI is assigned in each community;

The overlay area of rasterizing LTE network forms multiple grid, allows accommodating community in each grid;

Obtain the PCI mould X matrix of grid described in each;

The PCI overall performance of LTE network according to described PCI mould X matrix valuation.

2. method according to claim 1, is characterized in that, structure station list and cell list comprise:

Gather the base station information table of LTE network, the azimuth of described base station information table record base station IDs, community ID, latitude and longitude of base station and community;

Station list and cell list according to the data configuration of described base station information table record.

3. method according to claim 1, is characterized in that, the overlay area of rasterizing LTE network also comprises the overlapping coverage condition of prediction LTE network before forming multiple grid, specifically comprise:

Import map resource;

Import the parameter of LTE network;

The parameter of wireless environment is set;

Arrange cell edge field intensity, cell edge field intensity is the field intensity at the covering edge of prediction moment community;

Overlap according to the parameter of described map resource, LTE network, the parameter of wireless environment and cell edge field intensity prediction LTE network covers.

4. method according to claim 1, is characterized in that, the PCI mould X matrix obtaining grid described in each specifically comprises:

For a grid, the main Serving cell of selected described grid;

Interference threshold is set, counts candidate interfered cell according to described interference threshold:

Obtain the PCI mould X result of described main Serving cell, and, obtain the mould X result of each candidate interfered cell;

The candidate interfered cell that in statistics grid, PCI mould X result that is all and main Serving cell is consistent is as formal interfered cell;

According to the 1*N matrix of the received signal strength structure PCI mould X of main Serving cell and interfered cell.

5. method according to claim 4, is characterized in that, the 1*N matrix according to the received signal strength structure PCI mould X of main Serving cell and interfered cell specifically comprises:

The first row first row element of 1*N matrix is the received signal strength of main Serving cell, and all the other column elements are received signal strengths of interfered cell.

6. method according to claim 1, is characterized in that, according to described PCI mould X matrix valuation, the PCI overall performance of LTE network specifically comprises:

In each grid, go out the grid interference strength of interfered cell for the interference of main Serving cell according to PCI mould X matrix computations;

Cumulative grid interference strength described in each obtain interference overall strength D in LTE network as described PCI overall performance for assessment of.

7. method according to claim 6, is characterized in that, grid interference strength computing formula is:

$P_i=\underset{j=2}{\overset{n}{\mathrm{\&Sigma;}}}{10}^{\left(\frac{(a_{1j}-a_{11})+T}{10}\right)},$

Wherein, a ₁₁disturbed main Serving cell, j=2,3 ..., n, n-1 are the community numbers that in grid, all mould X values are identical with main Serving cell mould X value, a _1jfor jth-1 interfered cell, T is interference threshold.

8. a LTE network, is characterized in that, comprises PCI capability evaluating device, and described PCI overall performance comprises:

Lists construction unit, for constructing station list and cell list;

Physical area indicate allocation units, for according to described station list, cell list and planned physical area indicate PCI distribution, PCI is corresponded in each community;

Rasterizing unit, for the overlay area of rasterizing LTE network, forms multiple grid, allows accommodating community in each grid;

Matrix unit, for obtaining the PCI mould X matrix of each grid;

Performance Evaluation unit, for the PCI overall performance of LTE network according to PCI mould X matrix valuation.

9. LTE network according to claim 8, is characterized in that, matrix unit comprises:

Main Serving cell module, for for a grid, selectes the main Serving cell of described grid;

Interference threshold module, for arranging interference threshold, counts candidate interfered cell according to described interference threshold:

Mould X object module, for obtaining the PCI mould X result of main Serving cell, and, obtain the PCI mould X result of each candidate interfered cell;

Interfered cell module, for adding up all in grid and that main Serving cell PCI mould X result is consistent candidate interfered cell as formal interfered cell;

Matrix generation module, for the 1*N matrix of the received signal strength structure PCI mould X according to main Serving cell and interfered cell.

10. LTE network according to claim 9, is characterized in that, matrix unit comprises:

Grid interference strength computing module, for according to formula calculate the grid interference strength of this grid, wherein, a ₁₁disturbed main Serving cell, j=2,3 ..., n, n-1 are the community numbers that in grid, all mould X values are identical with main Serving cell mould X value, a _1jfor jth-1 interfered cell, T is interference threshold.