CN105491574A - Method and device for determining priority of neighbor regions in neighbor region planning - Google Patents

Abstract

The present application discloses a method for determining the priority of neighboring cells in neighboring cell planning, including: A. Calculating the distance influencing factor between the candidate neighboring cell and the current cell; the distance influencing factor is related to the distance between the candidate neighboring cell and the current cell, The closer the distance influence factor is, the bigger it is; B, calculate the angle influence factor of the candidate neighbors and the current cell; the angle influence factor and the connection direction of the candidate neighbors and the current cell, the antenna main lobe direction of the neighbors , and the antenna main lobe direction of the current cell. The more consistent the three directions are, the greater the angle influence factor is; C. The distance influence factor and the angle influence factor are summed to obtain the priority of the neighboring cell. The application also discloses a device for determining the priority of adjacent cells in adjacent cell planning. The solution of the present application can reduce the complexity of priority calculation.

Description

A method and device for determining the priority of neighboring cells in neighboring cell planning

technical field

The present application relates to the technical field of wireless communication, and in particular to a method and device for determining the priority of neighboring cells in neighboring cell planning.

Background technique

Neighboring cell planning is an important part of wireless network planning in network construction, and reasonable neighboring cell planning is the basic requirement to ensure system network performance.

LTE neighbor cell planning has the following basic principles:

Cells that are directly adjacent to each other geographically are generally regarded as neighboring cells;

Adjacent cells are generally required to be adjacent to each other, that is, sector A regards sector B as a neighbor, and sector B also regards A as a neighbor;

In some scenarios, it is necessary to set up a one-way neighbor.

For urban scenarios with small station spacing, more neighbors can be allocated, but the number limit should be considered and a certain margin should be left. At present, a maximum of 32 adjacent cells of the same frequency can be configured, a maximum of 64 adjacent cells of different frequencies can be configured, and a maximum of 64 adjacent cells of different systems can be configured.

The traditional neighborhood planning method generally adopts manual planning, which is inefficient and costly. With the increasing scale of mobile networks, hundreds or even thousands of base stations will be deployed in each city, especially denser cities. It is becoming more and more unrealistic to rely on manual planning, so it is necessary to use planning software to assist in neighborhood planning.

In the prior art, the scheme of using planning software for adjacent cell planning includes: performing adjacent cell planning through coverage prediction, and priority calculation is determined according to coverage overlap or distance. This solution has the following limitations: a relatively accurate electronic map is required to obtain the accurate coverage area of each cell, which leads to slow speed and high cost of planning adjacent cells, and the calculation process of priority and coverage overlap index is relatively complicated.

Contents of the invention

The present application provides a method and device for determining the priority of adjacent cells in adjacent cell planning, which can reduce the complexity of priority calculation.

The embodiment of this application provides a method for determining the priority of neighboring cells in neighboring cell planning, including:

A. Calculating the distance influencing factor between the candidate neighboring cell and the current cell; the distance influencing factor is related to the distance between the candidate neighboring cell and the current cell, and the closer the distance is, the greater the distance influencing factor is;

B, calculate the angle impact factor of the candidate neighbor cell and the current cell; the angle impact factor is related to the connection direction of the candidate neighbor cell and the current cell, the antenna main lobe direction of the neighbor cell, and the antenna main lobe direction of the current cell, The more consistent the directions of the three are, the greater the angle influence factor will be;

C. Summing the distance influence factor and the angle influence factor to obtain the priority of the neighboring cell.

Preferably, step A includes: calculating the distance between the current cell and each candidate neighbor according to the latitude and longitude of the current cell and each candidate neighbor in the set of candidate neighbors, and calculating the distance influencing factor Y of each candidate neighbor according to the distance, The distance influencing factor of the candidate neighboring cell with the larger distance from the current cell is smaller, and the value range of Y is: 0=<Y=<1;

Step B includes: calculating the angle influence factor X of each candidate neighboring cell; the value range of X is: 0=<X<1; the included angle between the connection direction of the current cell and the candidate neighboring cell and the main lobe direction of the antenna of the current cell Denoted as A, the value range is 0<=A<=90 degrees, the angle between the candidate neighbor cell and the current cell direction and the main lobe direction of the candidate neighbor cell antenna is recorded as B, and the value range is 0< =B<=90 degrees, if A and B are closer to 0, the angle influence factor X will be larger, if A and B are closer to 90 degrees, then the angle influence factor X will be smaller;

Step C includes: setting the weight value β of the distance influence factor and the weight value α of the angle influence factor;

The priority value of each candidate neighboring cell is calculated, and the calculation formula is: P=α×X+β×Y.

Preferably, the distance influencing factor Y is calculated according to the formula Y=1-DISi/MaxD, wherein DISi is the distance between the current cell and the ith candidate neighboring cell.

Preferably, the calculation of the angular influence factor X of each candidate neighboring cell is:

If 0<=A<=30 degrees and 0<=B<=30 degrees, the angle influence factor is set to X1;

If 0<=A<=30 degrees and 30 degrees<B<=65 degrees or 30 degrees<A<=65 degrees and 0<=B<=30 degrees, the angle influence factor is set to X2;

If 30°<A<=65° and 30°<B<=65°, the angle influence factor is set to X3;

When A and B are other angles (both greater than 65 degrees and less than 90 degrees), the impact factor is set to X4.

Wherein, X1>X2>X3>X4>=0.

Preferably, X1 is set to 0.25, X2 is set to 0.21, X3 is set to 0.18, and X4 is set to 0.

Preferably, the weight value β of the distance influence factor is 0.75.

The embodiment of the present application also provides a device for determining the priority of neighboring cells in neighboring cell planning, including:

The distance influencing factor calculation module is used to calculate the distance influencing factor between the candidate neighboring cell and the current cell; the distance influencing factor is related to the distance between the candidate neighboring cell and the current cell, and the closer the distance is, the greater the distance influencing factor is;

The angle influence factor calculation module is used to calculate the angle influence factor of the candidate neighbors and the current cell; the angle influence factor and the connection direction of the candidate neighbors and the current cell, the antenna main lobe direction of the candidate neighbors, and the current cell The direction of the main lobe of the antenna is related. The more consistent the directions of the three are, the greater the angle influence factor will be;

The neighbor cell priority calculation module is used to sum the distance influence factor and the angle influence factor to obtain the neighbor cell priority.

From the above technical solutions, it can be seen that the neighbor cell priority is calculated according to the topological relationship between the candidate neighbor cell and the current cell, and the calculation of the neighbor cell priority is performed through the quantified formula, which reduces the complexity of the priority calculation; fully considers The influence of factors such as the distance between the main cell and the adjacent cell and the antenna direction angle makes the calculation of the priority of the adjacent cell more reasonable.

Description of drawings

Fig. 1 is a schematic diagram of the adjacent cell planning process in the embodiment of the present application;

FIG. 2 is a flow chart of the method for calculating the priority of candidate neighboring cells in step 103.

detailed description

This application provides a method for determining the priority of neighboring cells in the planning of neighboring cells. The basic design idea is to calculate the priority of neighboring cells according to the topological relationship between the candidate neighboring cells and the current cell. The calculation of the priority mainly includes the influence of distance factor and angle impact factor, the distance impact factor is related to the distance between the candidate neighbors and the current cell, the closer the distance is, the greater the distance impact factor is; the angle impact factor is related to the connection direction of the candidate neighbors and the current cell, The direction of the main lobe of the antenna in the neighboring area is related to the direction of the main lobe of the antenna in the current cell. The more consistent the three directions are, the greater the angle influence factor will be.

In order to make the technical principles, features and technical effects of the technical solution of the present application clearer, the technical solution of the present application will be described in detail below in conjunction with specific embodiments.

The adjacent cell planning process in the embodiment of the present application is shown in Figure 1, including the following steps:

Step 101: Obtain network topology parameters of each cell.

The topology parameters can be obtained from the engineering parameters of the existing network. The specific network topology parameters include: the longitude and latitude of the cell, the azimuth of the cell, and the horizontal half-power angle of the antenna.

Step 102: Select a cell that has not been planned as the current cell, and determine a set of candidate neighbor cells of the current cell.

In the embodiment of the present application, the candidate neighboring cells can be selected as follows: use other cells within the coverage of the current cell as candidate neighboring cells, where the coverage is centered on the location of the current cell and the preset location of the current cell. Covering a fan-shaped area with a maximum distance of MaxD as the radius, the horizontal opening angle of the fan-shaped area is the horizontal lobe angle (65 degrees) of the current cell and the preset expansion factor (generally set to 2), and the main lobe direction of the antenna of the current cell The direction of the angle bisector as the horizontal angle.

Step 103: Calculate the priority of the candidate neighboring cells according to the network topology parameters of the neighboring cells.

Step 104: Sort the neighboring cells according to their priority, and select N candidate neighboring cells as neighboring cells in descending order of priority, where N is the preset maximum number of neighboring cells.

Step 105: If the adjacent cells of each cell are required to be inter-matched, all the cells are forced to perform adjacent-cell inter-configuration and then output the adjacent cell list, that is, to ensure that A cell is a neighbor of B and that cell B is also a neighbor of A. If not required, the neighbor list is output.

Wherein, in the step 103, the method for calculating the priority of candidate neighboring cells is as shown in Figure 2, comprising the following steps:

Step 201: Calculate the distance between the current cell and each candidate neighbor cell according to the latitude and longitude of the current cell and each candidate neighbor cell in the set of candidate neighbor cells. Wherein, the distance between the current cell and the ith candidate neighbor cell is recorded as DIS _i .

Step 202: Calculate the distance influencing factor Y of each candidate neighboring cell, and the distance influencing factor of the candidate neighboring cell with a larger distance from the current cell is smaller. The value range of Y is: 0=<Y=<1.

According to a preferred embodiment of the present application, the distance influencing factor of the i-th candidate neighboring cell is: Y=1-DIS _i /MaxD, where MaxD is the maximum distance covered by the preset coverage of the current cell.

Step 203: Calculate the angular influence factor X of each candidate neighboring cell. The value range of X is: 0=<X<1.

The angle between the connection direction of the current cell and the candidate neighbor cell and the main lobe direction of the antenna of the current cell is denoted as A (the value range is 0<=A<=90 degrees), and the angle between the candidate neighbor cell and the direction of the current cell The included angle with the main lobe direction of the antenna of the candidate neighboring cell is denoted as B (the value range is 0<=B<=90 degrees). If A and B are closer to 0, the angle influence factor X is larger. If A and B are closer The closer to 90 degrees, the smaller the angle influence factor X is.

According to a preferred embodiment of the present application, the angle influence factor is set as follows:

If 0<=A<=30 degrees and 0<=B<=30 degrees, the angle influence factor is set to X1;

If 0<=A<=30 degrees and 30 degrees<B<=65 degrees or 30 degrees<A<=65 degrees and 0<=B<=30 degrees, the angle influence factor is set to X2;

If 30°<A<=65° and 30°<B<=65°, the angle influence factor is set to X3;

When A and B are other angles (both greater than 65 degrees and less than 90 degrees), the impact factor is set to X4.

Wherein, X1>X2>X3>X4>=0.

According to another preferred embodiment of the present application, X1 is set to 0.25, X2 is set to 0.21, X3 is set to 0.18, and X4 is set to 0.

Step 204: Set the weight value β of the distance influence factor and the weight value α of the angle influence factor.

Different weight values can be configured according to different scenarios. Generally, the weight value β of the distance influence factor is set to 0.75, and the weight value X of the angle factor depends on X1, X2, X3 and X4.

Step 205: Calculate the priority value P of each candidate neighboring cell, the calculation formula is

P=α×X+β×Y.

The embodiment of the present application also provides a device for determining the priority of neighboring cells in neighboring cell planning, including:

The distance influencing factor calculation module is used to calculate the distance influencing factor between the candidate neighboring cell and the current cell; the distance influencing factor is related to the distance between the candidate neighboring cell and the current cell, and the closer the distance is, the greater the distance influencing factor is;

The angle influence factor calculation module is used to calculate the angle influence factor of the candidate neighbors and the current cell; the angle influence factor and the connection direction of the candidate neighbors and the current cell, the antenna main lobe direction of the candidate neighbors, and the current cell The direction of the main lobe of the antenna is related. The more consistent the directions of the three are, the greater the angle influence factor will be;

The neighbor cell priority calculation module is used to sum the distance influence factor and the angle influence factor to obtain the neighbor cell priority.

The above descriptions are only preferred embodiments of the application, and are not intended to limit the scope of protection of the application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the technical solutions of the application are It should be included within the protection scope of this application.

Claims (7)

1. determine a method for priority of adjacent domain in adjacent section planning, it is characterized in that, comprising:

The distance influence factor of A, calculated candidate adjacent area and current area; The distance dependent of described distance influence factor and candidate adjacent and current area, the nearlyer then distance influence factor of this distance is larger;

The angle factor of influence of B, calculated candidate adjacent area and current area; The antenna main lobe direction of described angle factor of influence and candidate adjacent and the line direction of current area, the antenna main lobe direction of waiting adjacent area and current area is relevant, and this three direction is more consistent, then angle factor of influence is larger;

C, by distance influence factor and angle factor of influence summation, obtain priority of adjacent domain.

2. method according to claim 1, it is characterized in that, steps A comprises: the longitude and latitude of each candidate adjacent in gathering according to current area and candidate adjacent, calculate the distance of current area and each candidate adjacent, the distance influence factor Y of each candidate adjacent is calculated according to described distance, the distance influence factor of the candidate adjacent larger with current area distance is then less, and the span of Y is: 0=<Y=<1;

Step B comprises: the angle factor of influence X calculating each candidate adjacent; The span of X is: 0=<X<1; Current area and the line direction of candidate adjacent and the main lobe direction angle of current area antenna are designated as A, span is 0<=A<=90 degree, the angle of candidate adjacent and the angle in direction, current area and the main lobe direction of candidate's adjacent cell antenna is designated as B, span is 0<=B<=90 degree, if A and B is more close to 0, then angle factor of influence X is larger, if A and B is more close to 90 degree, then angle factor of influence X is less;

Step C comprises: arrange the weighted value β of distance influence factor and the weight value α of angle factor of influence;

Calculate the priority value of each candidate adjacent, computing formula is: P=α × X+ β × Y.

3. method according to claim 2, is characterized in that, according to formula Y=1-DIS _i/ MaxD calculates distance influence factor Y, wherein, and DIS _ifor the distance of current area and i-th candidate adjacent.

4. method according to claim 2, is characterized in that, the angle factor of influence X of described each candidate adjacent of calculating is:

If 0<=A<=30 degree and 0<=B<=30 degree, then angle factor of influence is set to X1;

If 0<=A<=30 degree and 30 degree of <B<=65 degree or 30 degree of <A<=65 degree and 0<=B<=30 degree, then angle factor of influence is set to X2;

If 30 degree of <A<=65 degree and 30 degree of <B<=65 degree, then angle factor of influence is set to X3;

A and B is (be all greater than 65 degree and be less than 90 degree) during other angles, and factor of influence is set to X4.

Wherein, X1>X2>X3>X4Gre atT.GreaT.GT=0.

5. method according to claim 4, is characterized in that, X1 is set to 0.25, X2 and is set to 0.21, X3 and is set to 0.18, X4 and is set to 0.

6. method according to claim 2, is characterized in that, the weighted value β of distance influence factor is 0.75.

7. determine a device for priority of adjacent domain in adjacent section planning, it is characterized in that, comprising:

Distance influence factor computing module, for the distance influence factor of calculated candidate adjacent area and current area; The distance dependent of described distance influence factor and candidate adjacent and current area, the nearlyer then distance influence factor of this distance is larger;

Angle factor of influence computing module, for the angle factor of influence of calculated candidate adjacent area and current area; The antenna main lobe direction of described angle factor of influence and candidate adjacent and the line direction of current area, the antenna main lobe direction of waiting adjacent area and current area is relevant, and this three direction is more consistent, then angle factor of influence is larger;

Priority of adjacent domain computing module, for by distance influence factor and the summation of angle factor of influence, obtains priority of adjacent domain.