CN101076178A - Method and apparatus for planning adjacent domain - Google Patents
Method and apparatus for planning adjacent domain Download PDFInfo
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Abstract
The method comprises: setting a sampling point in the planning area; getting the signal coverage strength of each cell in the area; according to the signal coverage strength, making the planning for the adjacent cells of each cell, the invention also reveals an apparatus for planning the adjacent cells.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for planning neighboring cells.
Background
The neighbor cell is one of the most basic configurations of the wireless access network communication system, and is a basic condition for the wireless network communication system to perform fast handover. The neighbor cell planning is necessary support for establishing switching for the network, and is beneficial to quickly selecting a target cell during switching. With the continuous development of wireless network communication technology, a strong demand for automatic neighbor cell planning using a planning algorithm is generated.
In the prior art, an automatic planning algorithm for a wireless network neighboring cell based on coverage is provided. The algorithm is a judgment basis which is used as a neighbor cell judgment algorithm according to the distance between each cell and the direction angle of the antenna of each cell in the wireless network. For example, for the network state shown in fig. 1, for a source cell "G cheng xi 2" (denoted as S), the procedure for obtaining the neighboring cell of the source cell according to the algorithm is as follows:
step s101, obtaining a cell geographically adjacent to the cell, as an adjacent cell to the cell, as shown in an area labeled N1 in fig. 1.
Step s102, a cell in which the cell is not geographically completely adjacent but has a relatively close distance and the antenna direction is opposite to the source cell is obtained as a neighboring cell of the cell, as shown in the area labeled N2 in fig. 1.
And step S103, taking the union of the N1 and the N2 as the adjacent area of the S cell.
For the above procedure, the inventors believe that the process has at least the following disadvantages: the determination of the neighboring cell is based entirely on the geographical information, and the characteristics of the radio propagation are not taken into consideration, that is, the radio propagation is not taken as the basis for the determination of the neighboring cell. Therefore, when the radio propagation is affected by various factors and the geographic information is different, the result of the neighbor cell judgment is wrong. And the method has low calculation speed and cannot carry out rapid and accurate planning processing on a large network.
Disclosure of Invention
The embodiment of the invention aims to provide a method and a device for planning adjacent cells so as to realize rapid and accurate automatic planning of the adjacent cells of a wireless network.
In order to achieve the above object, an embodiment of the present invention provides a method for planning a neighboring cell, including the following steps:
setting sampling points in an area needing planning;
acquiring the coverage intensity of each cell in the area at the sampling point;
and planning the adjacent cells of each cell according to the coverage strength.
An embodiment of the present invention further provides a neighboring cell planning apparatus, including:
the sampling point setting unit is used for setting sampling points in an area needing planning;
the coverage intensity acquisition unit is used for acquiring the coverage intensity of each cell in the area at the sampling point set by the sampling point setting unit;
and the neighbor cell planning unit is used for planning the neighbor cells of the cells according to the coverage strength acquired by the coverage strength acquisition unit.
Compared with the prior art, the embodiment of the invention has at least the following advantages:
the coverage condition of the cell is used as the standard for judging the adjacent cell, so that the automatic planning of the adjacent cell is realized, and the method has the advantages of accuracy and quickness.
Drawings
Fig. 1 is a schematic diagram of acquiring a neighboring cell of a source cell in the prior art;
fig. 2 is a flowchart of a method for planning a neighboring cell according to an embodiment of the present invention;
fig. 3 is a flowchart of a method for planning neighboring cells according to a second embodiment of the present invention;
fig. 4 is a schematic diagram of a geographical area in which neighbor cell planning is required in a third embodiment of the present invention;
fig. 5 is a schematic diagram of setting sampling points in an area to be planned according to a third embodiment of the present invention;
FIG. 6 is a schematic diagram of setting an effective coverage distance in a third embodiment of the present invention;
fig. 7 is a schematic diagram of a neighbor cell planning apparatus in a fourth embodiment of the present invention.
Detailed Description
The embodiments of the present invention will be further described with reference to the drawings and examples.
In a first embodiment of the present invention, a flow of a neighbor cell planning method is shown in fig. 2, and includes the following steps:
step s201, setting sampling points in an area needing planning.
The setting mode of the sampling point can be set according to the requirement, for example, the existing rasterization network sampling point setting method is adopted.
And step s202, obtaining the coverage strength of each cell in the area at the sampling point.
The acquisition mode of the coverage strength can be calculated by using conditions such as cell parameters, propagation models and the like.
And step s203, planning the adjacent cells of each cell according to the coverage strength.
In the step, the neighboring cell planning of each cell is performed by taking the coverage condition based on the cell as the standard for judging the neighboring cell.
In the second embodiment of the present invention, a flow of a neighbor cell planning method is shown in fig. 3, and includes the following steps:
and step s301, setting sampling points in a geographical area covered by the wireless network.
Specifically, grids are divided according to a certain rule for a geographic area covered by the wireless network, and the grids are used as sampling points of the wireless network coverage condition to be processed subsequently.
The commonly used method of partitioning the grid is as follows: randomly selecting a certain point in a wireless network coverage area as a base point, carrying out meshed grid division on a geographic area according to a certain north-south distance and east-west distance, and taking grid points as sampling points of subsequent processing.
Step s302, an effective coverage distance covered by a cell is preset.
The setting of the effective coverage distance may be set based on empirical values. The effective coverage distance of the cell is set, so that each sampling point can be screened according to the effective coverage distance when the grid sampling points are calculated in the follow-up process, only base stations which possibly generate coverage are calculated, and the base stations of the whole network do not need to be calculated, so that the calculation efficiency is improved.
And step s303, selecting a sampling point, screening the coverage condition of each cell at the sampling point, and reserving the cells with effective coverage.
Selecting a sampling point of a grid line in the area, then judging whether the distances between all cells in the base station geographic position topological graph and the sampling point are within the effective coverage distance, if the distances between the cells and the sampling point are smaller than the set distance, considering that the cells can cover the sampling point, and the cells are called as effective cells of the sampling point.
And step s304, calculating the coverage condition of each effective cell to the sampling point.
According to the azimuth angle, the horizontal directional diagram, the antenna height, the terminal height and the cell carrier frequency transmission Power EIRP (Effective Isotropic Radiated Power) of each Effective cell antenna, selecting a proper propagation model, calculating the propagation loss of all sectors covering the point and the receiving level of the current point, and obtaining the coverage strength of each Effective cell at each sampling point.
And step s305, screening according to the receiving level of each effective cell at the sampling point, deleting cells which are not covered and are covered by less than a certain threshold from the effective cell list, and reserving the cells which are effectively covered.
Step s306, determining whether all the sampling point calculations are completed, if yes, performing step s307, otherwise, performing step s 303.
And step s307, recording the number of sampling points covered by the source cell and the target cell together.
Each cell is respectively treated as a source cell, when the source cell and another cell (called a target cell) generate coverage (called common coverage) higher than a certain level threshold for some sampling points, the target cell is added into a possible neighbor cell list of the source cell, and the number of the sampling points covered commonly is recorded.
And step s308, selecting a neighboring cell of the source cell.
And sorting the possible neighbor cell list of each cell from large to small according to the number of the grid points covered together, and screening a certain number of cells sorted in the front as the neighbor cells of the source cell.
And step s309, performing post-processing to eliminate the unidirectional adjacent cells and ensure that the cells under the same base station are adjacent to each other.
The third embodiment of the present invention is described with reference to a specific application scenario.
For the geographic area shown in fig. 4, firstly, the grid is divided according to a certain rule, and the grid points are used as sampling points of the wireless network coverage condition. The schematic diagram after the grid division is shown in fig. 5.
According to the preset effective coverage distance, determining which cells each sampling point may be covered by, taking the sampling point "G city 2" in fig. 5 as an example, as shown by a circle in fig. 6, each sampling point inside the circle can be covered by the station "G city 2" at the center of the circle.
For each intersection point (i.e. sampling point) of the grid lines, the coverage strength of each cell which may cover the sampling point is calculated through the propagation model, and a coverage strength list is obtained.
The method for acquiring the coverage strength specifically comprises the following steps: the coverage of each cell to the sampling point is calculated according to a Propagation Model, for example, using an SPM (Standard Propagation Model), the Propagation loss of all cells covering the point and the receiving level of the current point can be calculated by using a formula. The formula and parameters used by the SPM model are as follows:
Lmodel＝K1+K2log(d)+K3log(HTxeff)+K4×Diffraction loss+K5log(d)×log(HTxeff)+K6(HRxeff)+Kclutterf(clutter)
wherein,
Lmodel: propagation loss
K1: a bias constant;
d: the distance (m) between the receiver and the transmitter;
K2: coefficient of log (d) of distance;
HTxeff: the effective height of the transmitter antenna;
K3: log height (H) of transmitting antennaTxeff) The coefficient of (a);
diffraction loss: loss due to diffraction when encountering an obstacle;
K4: coefficient of diffraction loss，K4Must be positive;
K5: logarithm of transmit antenna height to log distance product log (H)Txeff) Coefficient of log (d);
HRxeff: the effective height of the receiving antenna;
K6: log (H) of effective height of receiving antennaRxeff) The coefficient of (a);
f (clutter): weighted average losses due to terrain;
Kclutter: coefficient of weighted average loss f (clutter) due to the ground object.
In the propagation model, the coefficient K1To K6、KclutterAnd the average loss f (clutter) of the ground features are determined by the test environment. To obtain a propagation loss LmodelAfter the value of (3), the propagation loss is subtracted from the transmit level to obtain the receive level.
And calculating the receiving level of each cell which can cover the point through the propagation model, and taking the receiving level as the coverage strength, thereby obtaining a coverage strength list.
The list is sorted and for cells below a certain coverage threshold, which are considered to have not produced effective coverage, the cell is removed from the list.
Repeating the above steps can obtain the covered cell list of all grid points, assuming that the list of a certain sampling point is as follows:
cell A-X1db
Cell B-X2db
Cell C-X3db
… 』
From the above list, it can be shown that both cell a and cell B generate effective coverage for the point, and at this point handover from cell a to cell B may occur, so that the common coverage count between cell a and cell B is increased by one, and similarly, the same process is performed for both cell a and cell C, and cell B and cell C.
From the above, a common coverage list of each cell and other cells can be obtained, for example, as follows:
common coverage list of cell a:
cell B12 sampling points
Cell C10 sampling points
… 』
Sorting the list, and screening out the cells of the previous certain number as the adjacent cells of the A cell
And finally carrying out post-treatment, wherein the post-treatment comprises the following steps:
if the cells under the same base station are not neighboring cells to each other, they are configured as neighboring cells, for example:
if A, B and C are cells under the same base station, AB, AC and BC should be adjacent to each other, and if the relation is not existed, the addition is carried out.
Configuring the single neighbor as a bidirectional neighbor, for example:
if B is the adjacent area of A, but A is not the adjacent area of B, then it is called unidirectional adjacent area, which modifies it to bidirectional adjacent area, that is AB is adjacent area each other.
By the neighbor cell planning method described in the above embodiment, automatic planning of a neighbor cell is realized, and the coverage condition based on the cell is adopted as the criterion for judging the neighbor cell in the planning, which has the advantages of accuracy and rapidness.
In a fourth embodiment of the present invention, a neighboring cell planning apparatus is provided, a schematic diagram of which is shown in fig. 7, and the neighboring cell planning apparatus further includes: a sampling point setting unit 10, a coverage strength obtaining unit 20, and a neighbor planning unit 30.
And the sampling point setting unit 10 is used for setting sampling points in an area needing planning. The setting method of the sampling point can be as follows: randomly selecting a certain point in the area as a base point, carrying out reticular grid division on the geographic area at a certain north-south distance and east-west distance, and taking the grid point as a sampling point for subsequent processing.
And a coverage strength obtaining unit 20, configured to obtain coverage strength of the sampling point set by the sampling point setting unit 10 in each cell in the area, where the coverage strength is used as a basis for determining planning of the neighboring cell during planning.
Specifically, the coverage strength acquiring unit 20 further includes:
the cell information subunit 21 is configured to store cell information and antenna parameters, where the cell information includes geographic location parameters, and the antenna parameters include an azimuth angle of a cell antenna, a horizontal directional diagram, an antenna height, a terminal height, and a cell carrier frequency transmission power EIRP.
A propagation model selection subunit 22 for selecting a propagation model required for obtaining the coverage strength, e.g. using an SPM propagation model.
And an intensity obtaining subunit 23, configured to obtain the coverage intensity of each cell at each sampling point according to the content provided by the cell information subunit 21 and the propagation model selecting subunit 22. The coverage strength uses the reception level as a reference standard. After the propagation loss value is obtained by using the propagation model, the transmission loss is subtracted by using the transmission level, and the reception level can be obtained.
A cell selecting subunit 24, configured to notify the strength obtaining subunit 23 of a cell range used when obtaining the coverage strength of each cell at each sampling point according to a preset effective coverage distance of the cell. The effective coverage distance can be set according to an empirical value, and after the effective coverage distance of the cell is set, the strength acquisition subunit 23 only calculates the cell which may cover the sampling point when acquiring the coverage strength of each sampling point of each cell, without calculating all cells, thereby improving the calculation efficiency.
And a neighboring cell planning unit 30, configured to perform neighboring cell planning on each cell according to the coverage strength obtained by the coverage strength obtaining unit 20.
Specifically, the neighboring area planning unit 30 further includes:
and a threshold setting subunit 31, configured to set a coverage strength threshold.
A cell list maintaining subunit 32, configured to maintain a cell list of each sampling point according to the threshold set by the threshold setting subunit 31. And regarding the cell with the coverage intensity lower than the coverage intensity threshold in the cell list of each sampling point, considering that the cell does not generate effective coverage, and deleting the cell from the list.
And a neighboring cell selecting subunit 33, configured to select a neighboring cell of each cell according to the cell list of each sampling point maintained by the cell list maintaining subunit 32. Specifically, each cell is respectively treated as a source cell, and when the source cell and other target cells generate coverage (referred to as common coverage) higher than a certain level threshold on certain sampling points, the target cells are added into a possible neighbor cell list of the source cell, and the number of the sampling points covered commonly is recorded. And sorting the possible neighbor cell list of each cell from large to small according to the number of the commonly covered sampling points, and screening a certain number of cells which are sorted in the front as the neighbor cells of the source cell.
And a post-processing subunit 34, configured to perform post-processing on the neighboring cell of each cell selected by the neighboring cell selecting subunit 33, so as to obtain a neighboring cell plan of each cell. The post-treatment comprises: if the cells under the same base station are not adjacent cells, configuring the cells as the adjacent cells; and configuring the single-item neighbor cell into a bidirectional neighbor cell.
The neighbor cell planning device described in the above embodiment realizes automatic planning of a neighbor cell, and has the advantages of accuracy and rapidness by using the coverage condition based on the cell as the criterion for judging the neighbor cell in the planning.
The above disclosure is only for a few specific embodiments of the present invention, but the present invention is not limited thereto, and any variations that can be made by those skilled in the art are intended to fall within the scope of the present invention.
Claims (12)
1. A method for planning adjacent cells is characterized by comprising the following steps:
setting sampling points in an area needing planning;
acquiring the coverage intensity of each cell in the area at the sampling point;
and planning the adjacent cells of each cell according to the coverage strength.
2. The method for planning a neighboring cell according to claim 1, wherein the step of setting the sampling points in the area to be planned specifically comprises:
dividing grids in the region needing planning;
and setting the intersection points of the grids as sampling points.
3. The method for planning a neighboring cell according to claim 1, wherein the step of obtaining the coverage strength of each cell in the cell at the sampling point specifically comprises:
establishing a cell list about the sampling points for each sampling point;
acquiring antenna parameters of each cell in the cell list and selecting a propagation model;
and acquiring the coverage intensity of each cell at each sampling point according to the antenna parameters of each cell and the propagation model.
4. The neighbor planning method of claim 3, wherein said step of establishing a cell list for each sample point further comprises, after said step of:
setting an effective coverage distance of a cell;
for each sampling point, deleting cells having a distance from the sampling point greater than the effective coverage distance from the cell list of the sampling point.
5. The method for planning neighboring cells according to claim 3, wherein the step of planning neighboring cells of each cell according to the coverage strength specifically includes:
setting a coverage intensity threshold;
for each sampling point, deleting the cells of which the coverage intensity of the sampling point is less than the coverage intensity threshold from the cell list of the sampling point;
and planning the adjacent cells of each cell according to the cell list of each sampling point.
6. The method for planning a neighboring cell according to claim 5, wherein the step of performing the neighboring cell planning of each cell according to the cell list of each sample point specifically comprises:
for each cell, setting the cell as a source cell and other cells as target cells;
acquiring the times that the source cell and each target cell are in the cell list of any sampling point according to the cell list of each sampling point;
selecting a certain number of target cells as the adjacent cells of the source cell according to the times;
and carrying out post-processing on the adjacent cells of each cell to finish the adjacent cell planning of each cell.
7. The neighbor planning method of claim 6, wherein said post-processing comprises:
configuring cells which are not adjacent cells to each other in the cells under the same base station as the adjacent cells; and/or
And configuring the one-way adjacent cells existing in each cell as the adjacent cells.
8. A method for planning a neighbouring cell according to claim 1, 3, 4 or 5, wherein said reference criterion for the coverage strength is the reception level.
9. A neighbor cell planning apparatus, comprising:
the sampling point setting unit is used for setting sampling points in an area needing planning;
the coverage intensity acquisition unit is used for acquiring the coverage intensity of each cell in the area at the sampling point set by the sampling point setting unit;
and the neighbor cell planning unit is used for planning the neighbor cells of the cells according to the coverage strength acquired by the coverage strength acquisition unit.
10. The neighbor planning apparatus of claim 9, wherein the coverage strength obtaining unit further comprises:
the cell information subunit is used for storing cell information and antenna parameters;
a propagation model selection subunit, configured to select a propagation model required for obtaining the coverage strength;
and the intensity obtaining subunit is used for obtaining the coverage intensity of each cell at each sampling point according to the content provided by the cell information subunit and the propagation model selecting subunit.
11. The neighbor planning apparatus of claim 10, wherein the coverage strength obtaining unit further comprises:
and the cell selection subunit is used for informing the strength acquisition subunit of the cell range used when the strength acquisition subunit acquires the coverage strength of each sampling point according to the preset effective coverage distance of the cell.
12. The neighbor planning apparatus of claim 9, wherein the neighbor planning unit further comprises:
a threshold setting subunit; the method comprises the steps of setting a coverage intensity threshold;
the cell list maintenance subunit is used for maintaining a cell list of each sampling point according to the threshold set by the threshold setting subunit;
the neighbor cell selection subunit is used for selecting the neighbor cells of each cell according to the cell list of each sampling point maintained by the cell list maintenance subunit;
and the post-processing subunit is used for performing post-processing on the neighboring cells of the cells selected by the neighboring cell selection unit to obtain the neighboring cell plan of each cell.
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