CN110012486B - Method and device for judging cross-zone coverage - Google Patents

Abstract

The present application discloses a method for judging cross-area coverage. The method includes: acquiring a coordinate system and a direction angle a1 of an evaluation base station, and determining a first coverage area of the evaluation base station according to the coordinate system and direction angle a1 of the evaluation base station; The nearest base station of the evaluation base station in the coverage area; calculate the direction angle a2 and the distance Dab between the evaluation base station and the nearest base station, and determine the second coverage area according to a2; calculate the relationship between each mobile terminal and the evaluation base station in the first coverage area The direction angle a3 and the distance Dn between them; determine the mobile terminals in the second coverage area according to a3; according to Dab, Dn and the number M of mobile terminals in the second coverage area, determine whether the serving cell to which the evaluation base station belongs is over-covered. The present application can judge whether the service cell to which the evaluation base station belongs is over-area coverage, which can greatly save the time for judging the over-area problem, and can be used as the basis for the self-optimization judgment of the antenna feeder system.

Description

A method and device for judging cross-area coverage

technical field

The invention belongs to the technical field of data processing, and in particular relates to a method and device for judging cross-area coverage.

Background technique

The existing stock base station antennas of domestic operators have reached millions. Based on the cross-area coverage of the antennas, the coverage, quality and capacity of the mobile communication network are deteriorated. Problem detection has always been a problem in the industry. In the face of the upcoming 5G network deployment, automatic optimization based on antenna feeders is a major challenge and the most basic content for the transformation of current network operations to automation, intelligence and intelligent network optimization.

There are many problems in the existing methods for judging the over-area coverage of the antenna and feeder, either the evaluation object is the grid instead of the over-area cell. Or there is a normal situation where multiple signal sources from different directions cover the same area (a specific grid), and it wastes a lot of time to determine whether it is over-covered. Finding a reasonable method for over-area coverage of antennas and feeders is of great significance for improving the automatic optimization of antennas and feeders and the transformation of network optimization in the future.

SUMMARY OF THE INVENTION

Aiming at the existing method for judging the over-area coverage of the antenna and feeder, there may be many problems, which lead to the problem that the evaluation object is not the over-area cell, and it wastes a lot of time to judge whether the over-area coverage is not. .

The present application provides a method for judging cross-area coverage, including:

Obtain the coordinate system and direction angle a1 of the evaluation base station, and determine the first coverage area of the evaluation base station according to the coordinate system and direction angle a1 of the evaluation base station;

determining the closest base station to the evaluation base station within the first coverage area;

Calculate the direction angle a2 and the distance Dab between the evaluation base station and the nearest base station, and determine the second coverage according to the a2;

Calculate the direction angle a3 and the distance Dn between each mobile terminal in the first coverage area and the evaluation base station;

Determine the mobile terminal within the second coverage according to the a3;

According to the Dab, the Dn and the number M of mobile terminals in the second coverage area, it is determined whether the serving cell to which the evaluation base station belongs is over-covered.

Optionally, the step of judging whether the serving cell to which the evaluation base station belongs is over-area coverage according to the Dab, the Dn and the number M of the mobile terminals within the second coverage area, includes:

Count the number m of mobile terminals with Dn≥Dab, and calculate the ratio of m to the number M of mobile terminals within the second coverage area;

judging whether the ratio is greater than or equal to a second threshold;

If so, it is determined that the serving cell is over-covered.

Optionally, the step of determining the nearest base station of the evaluation base station within the first coverage area includes:

Calculate the direction angle a4 between the evaluation base station and each surrounding base station;

Determine the surrounding base stations that meet a preset condition, where the preset condition is a4<2a1;

From the surrounding base stations that satisfy the preset condition, the base station closest to the evaluation base station is selected and determined as the closest base station.

Optionally, the step of calculating the direction angle a3 and the distance Dn between each mobile terminal in the first coverage area and the evaluation base station includes:

acquiring each mobile terminal within the first coverage area, and respectively determining a measurement report of each mobile terminal within the first coverage area, where the measurement report includes the latitude and longitude coordinates of each mobile terminal;

According to the latitude and longitude coordinates of the mobile terminals, the direction angle a3 and the distance Dn between the mobile terminals and the evaluation base station are calculated in units of the mobile terminals.

Optionally, the measurement report further includes the signal level value of the evaluation base station reported by each mobile terminal, and the relationship between the mobile terminal and the mobile terminal is calculated in units of the mobile terminal according to the latitude and longitude coordinates of each mobile terminal. Before the step of evaluating the bearing angle a3 and the distance Dn between the base stations, including:

Screening out the mobile terminals whose signal level value reported to the evaluation base station is greater than or equal to a first threshold within the first coverage area.

Optionally, the step of calculating the direction angle a3 and the distance Dn between each mobile terminal in the first coverage area and the evaluation base station further includes:

dividing the first coverage area into grids, and respectively determining gridded data of each grid, where the gridded data includes the coordinates of the center points of each grid;

According to the coordinates of the center point of each grid, the direction angle a3 and the distance Dn between each mobile terminal and the evaluation base station are calculated in units of the grid, wherein each mobile terminal in the same grid has The same a3 and Dn.

Optionally, the gridded data includes the signal level value of the evaluation base station reported by each mobile terminal in each grid, and the grid is used as a unit to calculate the relationship between each mobile terminal and all mobile terminals in the first coverage area. Before evaluating the distance Dn between the base stations and the direction angle a3 of each mobile terminal, it also includes:

Calculate the average value of the signal level values reported by the mobile terminal to the evaluation base station in each grid;

The grids with the average value greater than or equal to the first threshold are filtered out.

Optionally, the first coverage area is a sector-shaped area in the coordinate system with the evaluation base station as the center and 2*a1 as the included angle, and the second coverage area is in the coordinate system with the evaluation base station as the center, 2*a2 is the fan-shaped area of the included angle.

The present application also provides a device for judging cross-area coverage, including:

a first determination module, configured to obtain the coordinate system and the direction angle a1 of the evaluation base station, and determine the first coverage area of the evaluation base station according to the coordinate system and the direction angle a1 of the evaluation base station;

a second determining module, configured to determine the nearest base station of the evaluation base station within the first coverage area;

a third determining module, configured to calculate the direction angle a2 and the distance Dab between the evaluation base station and the nearest base station, and determine the second coverage according to the a2;

a first calculation module, configured to calculate the direction angle a3 and the distance Dn between each mobile terminal and the evaluation base station in the first coverage area;

a fourth determining module, configured to determine the mobile terminal within the second coverage according to the a3;

A judging module, configured to judge whether the serving cell to which the evaluation base station belongs is over-covered according to the Dab, the Dn and the number M of mobile terminals within the second coverage area.

Optionally, the judging module includes:

a first calculation submodule, configured to count the number m of mobile terminals with Dn≥Dab, and calculate the ratio of m to the number M of mobile terminals within the second coverage;

a judging submodule for judging whether the ratio is greater than or equal to a second threshold;

The first determination sub-module is configured to determine if the serving cell is over-covered.

Optionally, the second determining module includes:

The second calculation submodule is used to calculate the direction angle a4 between the evaluation base station and each surrounding base station;

The second determination sub-module is used to determine the surrounding base stations that satisfy a preset condition, where the preset condition is a4<2a1;

The third determining submodule is configured to select, from the surrounding base stations meeting the preset condition, the base station closest to the evaluation base station and determine as the closest base station.

Optionally, the first computing module includes:

a fourth determination sub-module, configured to acquire each mobile terminal within the first coverage area, and respectively determine a measurement report of each mobile terminal within the first coverage area, where the measurement report includes the latitude and longitude coordinates of each mobile terminal ;

The third calculation submodule is configured to calculate the direction angle a3 and the distance Dn between the mobile terminals and the evaluation base station in units of the mobile terminals according to the latitude and longitude coordinates of the mobile terminals.

Optionally, the first computing module further includes:

The first filtering sub-module is configured to filter out the mobile terminals whose signal level value reported to the evaluation base station is greater than or equal to a first threshold within the first coverage area.

Optionally, the first computing module further includes:

a fifth determining submodule, configured to divide the grids into the first coverage area, and determine gridded data of each grid respectively, where the gridded data includes the coordinates of the center points of each grid;

The fourth calculation sub-module is used to calculate the direction angle a3 and the distance Dn between the mobile terminals and the evaluation base station in units of the grid according to the coordinates of the center points of the grids, wherein the same Each mobile terminal within the grid has the same a3 and Dn.

Optionally, the gridded data includes the signal level value of the evaluation base station reported by each mobile terminal in each grid, and the first calculation module further includes:

a fifth calculation submodule, configured to calculate the average value of the signal level values reported by the mobile terminal to the evaluation base station in each grid;

The second filtering submodule is configured to filter out the grids whose average value is greater than or equal to the first threshold.

Optionally, the first coverage area is a sector-shaped area in the coordinate system with the evaluation base station as the center and 2*a1 as the included angle, and the second coverage area is in the coordinate system with the evaluation base station as the center, 2*a2 is the fan-shaped area of the included angle.

A method for judging cross-area coverage provided by the present application firstly determines the first coverage area of the evaluation base station according to the coordinate system of the evaluation base station and the fixed direction angle a1, then calculates the nearest base station of the evaluation base station within the first coverage area, and then according to The direction angle a2 of the nearest base station determines the second coverage area. Finally, according to the distance Dab between the evaluation base station and the nearest base station, Dn and the number M of mobile terminals in the second coverage area, it is judged whether the serving cell to which the evaluation base station belongs is over-covered, which can save a lot of time for judging the over-area problem. In addition, when the present application is applied to an antenna-feeder automatic optimization system, the ESC antenna can be driven to automatically adjust the downtilt angle, thereby forming an automatic judgment and closed-loop control of antenna optimization.

Description of drawings

FIG. 1 is a flowchart of a method for judging over-area coverage provided by the first embodiment of the present application;

FIG. 2 is a flowchart of step S2 in FIG. 1 provided by the first embodiment of the present application;

FIG. 3 is a flowchart of step S6 in FIG. 1 provided by the first embodiment of the present application;

FIG. 4 is a schematic diagram of over-area coverage provided by the first embodiment of the present application;

FIG. 5 is a schematic structural diagram of a device for judging cross-area coverage provided by a second embodiment of the present application;

FIG. 6 is another schematic structural diagram of a device for judging cross-area coverage provided by the second embodiment of the present application;

FIG. 7 is another schematic structural diagram of an apparatus for judging a handover coverage provided by a second embodiment of the present application.

Detailed ways

In order to make those skilled in the art better understand the technical solutions of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

The present application provides a method and device for judging cross-area coverage. The following is a detailed description one by one with reference to the accompanying drawings of the embodiments provided in the present application.

A method for judging over-area coverage provided by the first embodiment of the present application is as follows:

The execution subject of the embodiment of the present application is a base station, as shown in FIG. 1 , which shows a flowchart of a method for judging a handover coverage provided by the embodiment of the present application, including the following steps.

In step S1, the coordinate system and the direction angle a1 of the evaluation base station are acquired, and the first coverage area of the evaluation base station is determined according to the coordinate system and the direction angle a1 of the evaluation base station.

The antenna feeder, short for the antenna feeder system, refers to the antenna radiating electromagnetic waves to the surrounding space. Based on the cross-area coverage of the antenna, the coverage, quality and capacity of the mobile communication network are deteriorated, and the antenna feeder occupies most of the workload of daily operation and maintenance optimization. Therefore, the present application provides a method for judging the cross-area coverage of the antenna feeder

In this step, the coordinate system and the direction angle a1 of each evaluation base station are first obtained. The direction angle a1 is fixed, and the specific value can be set according to the needs, which is not limited here. The coordinate system takes the evaluation base station as the origin, the due north direction is the Y axis, and the due east direction is the X axis, and the longitude and latitude coordinates of the evaluation base station need to be obtained. As shown in FIG. 4 , base station A is the origin of the coordinate system, the due east direction of base station A is the X axis, and the due north direction of base station A is the Y axis. The first coverage area is a sector-shaped area in the coordinate system with the evaluation base station as the center and 2*a1 as the included angle.

Step S2, determining the nearest base station of the evaluation base station within the first coverage area.

Preferably, as shown in FIG. 2 , in step S2, determining the nearest base station of the evaluation base station within the first coverage area includes:

Step S201, calculating the direction angle a4 between the evaluation base station and each surrounding base station.

Step S202, determining the surrounding base stations that satisfy a preset condition, where the preset condition is a4<2a1.

Step S203, from the surrounding base stations that satisfy the preset condition, select a base station that is closest to the evaluation base station and determine it as the closest base station.

In this step, take any evaluation base station as the evaluation object, first calculate the direction angle a4 between the evaluation base station and each surrounding base station, the method is to obtain the longitude and latitude coordinates of each surrounding base station, and obtain the longitude and latitude coordinates of each surrounding base station and the evaluation base station. The coordinates calculate the distance between the evaluation base station and each surrounding base station through the Pythagorean theorem, and calculate the angle between the X-axis and the connection line between the evaluation base station and the surrounding base station through the arctangent function, which is the direction angle a4 between the evaluation base station and each surrounding base station. According to the calculated direction angle a4, it is determined whether each surrounding base station satisfies a4<2a1, that is, whether each surrounding base station falls within the first coverage area. And from the surrounding base stations that fall within the first coverage area, a base station that is closest to the evaluation base station is selected as the closest base station of the evaluation base station. It needs to be explained that the background neighbor configuration parameters are generally not used to prevent the missing and mismatching of the neighbor configuration data.

Step S3: Calculate the direction angle a2 and the distance Dab between the evaluation base station and the nearest base station, and determine the second coverage according to the a2.

In this step, after the nearest base station of the evaluation base station is selected, the direction angle a2 and the distance Dab between the evaluation base station and the nearest base station calculated in step S2 are obtained, and it is determined that the second coverage range is within the coordinate system and the evaluation base station is The center of the circle and 2*a2 are the fan-shaped areas of the included angle. For example, as shown in FIG. 4 , base station A is the evaluation base station, and the selected nearest base station is base station B. The included angle between the connection line between base station B and base station A and the X axis is the direction angle a2 between base station B and base station A, and the distance between base station A and base station B is Dab. It should be noted that the area in FIG. 4 is not the second coverage area. The second coverage area is larger than the area in FIG. 4 and is a sector-shaped area with base station A as the center and 2*a2 as the included angle.

Step S4, calculating the direction angle a3 and the distance Dn between each mobile terminal in the first coverage area and the evaluation base station.

Preferably, in the step S4, calculating the direction angle a3 and the distance Dn between each mobile terminal in the first coverage area and the evaluation base station, including:

Step 1): Acquire each mobile terminal within the first coverage area, and respectively determine a measurement report of each mobile terminal within the first coverage area, where the measurement report includes the latitude and longitude coordinates of each mobile terminal.

Step 2), according to the latitude and longitude coordinates of the mobile terminals, calculate the direction angle a3 and the distance Dn between the mobile terminals and the evaluation base station in units of the mobile terminals.

Preferably, the measurement report further includes the signal level value of the evaluation base station reported by each mobile terminal, before step 2), including:

Step 3): Screen out the mobile terminals whose signal level value reported to the evaluation base station is greater than or equal to a first threshold within the first coverage area.

In this step, a measurement report with a high-precision coordinate system that is automatically reported by the mobile terminal (MR sampling points) within the first coverage area of the evaluation base station is introduced. The measurement report includes the latitude and longitude coordinates of each mobile terminal and the signal level value of the evaluation base station reported by each mobile terminal. According to the longitude and latitude coordinates of each mobile terminal in the first coverage area and the longitude and latitude coordinates of the evaluation base station, the distance Dn between the evaluation base station and each mobile terminal is calculated by the Pythagorean theorem, and the X-axis is calculated by the arc tangent function to connect the evaluation base station and each mobile terminal. The included angle is the direction angle a3 between the evaluation base station and each mobile terminal.

In addition, the signal level value of the evaluation base station reported by each mobile terminal is used to filter the MR sampling points. Statistically filter the sampling points where the signal level value of the evaluation base station reported by each mobile terminal is greater than or equal to the first threshold, to ensure that the evaluation object signal value is within a certain range and can meet service and business requirements. The first threshold needs to be preset according to requirements, which is not limited here.

Preferably, the step S4, calculating the direction angle a3 and the distance Dn between each mobile terminal in the first coverage area and the evaluation base station, further includes:

Step 4), dividing the first coverage area into grids, and respectively determining the gridded data of each grid, where the gridded data includes the coordinates of the center points of each grid;

Step 5), according to the coordinates of the center point of each grid, calculate the direction angle a3 and the distance Dn between the each mobile terminal and the evaluation base station in the unit of the grid, wherein, in the same grid Each mobile terminal has the same a3 and Dn.

Preferably, the gridded data includes the signal level value of the evaluation base station reported by each mobile terminal in each grid, and before step 5), further includes:

Step 6), calculating the average value of the signal level values reported by the mobile terminal to the evaluation base station in each grid;

Step 7), screening out the grids whose average value is greater than or equal to the first threshold.

In this step, the grids that are uniformly divided in advance for the first coverage area are introduced, and the gridded data for each grid is acquired. Multiple mobile terminals may fall in the same grid, and the gridded data includes the coordinates of the center point of each grid and the signal level value of the evaluation base station reported by each mobile terminal in each grid. For the convenience of calculation, the longitude and latitude of all MR sampling points in the grid of the evaluation object cell are uniformly represented by the longitude and latitude of the grid center. According to the coordinates of each grid center point in the first coverage area and the longitude and latitude coordinates of the evaluation base station, the distance Dn between the evaluation base station and the coordinates of each grid center point is calculated by the Pythagorean theorem, that is, the evaluation base station and all mobile terminals in each grid The distance Dn. And the angle between the X axis and the coordinate connecting line between the evaluation base station and the center point of each grid is calculated by the arc tangent function, which is the direction angle a3 between the evaluation base station and all mobile terminals in each grid.

In addition, the signal level value of the evaluation base station reported by each mobile terminal in each grid is used to filter the MR sampling points in each grid. The average value of the signal level values of the evaluation base stations reported by the mobile terminals in each grid is taken as the signal level value of the grid, and the average value of the signal level values of the evaluation base stations reported by the mobile terminals in each grid is statistically filtered. The grid ≥ the first threshold value ensures that the signal value of the evaluation object is within a certain range, which can meet the service and business requirements. The first threshold needs to be preset according to requirements.

It should be noted that, step S4 calculates the direction angle a3 and the distance Dn between each mobile terminal within the first coverage area and the evaluation base station.

Step S5: Determine the mobile terminals within the second coverage area according to the a3.

In this step, the mobile terminals that fall within the second coverage area are determined according to the a3, that is, the mobile terminals that satisfy a3<2a2. For example, as shown in Figure 4, when base station A is the evaluation base station, and the selected nearest base station is base station B, the reasonable coverage distance of the second coverage area of base station A is D-ab; the home MR sampling within the second coverage area of base station A Points MR1-MRn have Dn distance values from base station A, respectively. Each sampling point MRn corresponds to a direction angle a3, and the direction angle a3 is the included angle between the line connecting each sampling point MRn and the evaluation base station and the X axis.

Step S6, according to the Dab, the Dn and the number M of mobile terminals within the second coverage area, determine whether the serving cell to which the evaluation base station belongs is over-covered.

Preferably, as shown in FIG. 3 , in step S6, according to the Dab, the Dn and the number M of mobile terminals within the second coverage area, determine whether the serving cell to which the evaluation base station belongs is over-covered, including :

Step S601, count the number m of mobile terminals with Dn≥Dab, and calculate the ratio of m to the number M of mobile terminals in the second coverage area.

Step S602, it is judged whether the ratio is greater than or equal to the second threshold, if so, step S603 is executed; if not, the process ends.

Step S603, it is determined that the serving cell is over-covered.

The core idea of this application is that any mobile communication base station must, according to the planning and design requirements, have an effective coverage that cannot exceed its nearest neighbor (the ideal coverage distance is 2/3*D, where Dab is the distance between the serving cell and the nearest base station in the coverage direction).

In this step, the number m of mobile terminals with Dn≥Dab is counted, and the ratio of m to the number M of mobile terminals in the second coverage area is calculated. It is judged whether the ratio is greater than or equal to the second threshold, and when it is greater than or equal to, it indicates that the number of mobile terminals exceeding the distance between the evaluation base station and the nearest base station is too large, indicating that the serving cell is over-covered. If the ratio is smaller than the second threshold, it means that the number of mobile terminals exceeding the distance between the evaluation base station and the nearest base station is not large, and the serving cell has no over-area coverage. The second threshold needs to be preset according to requirements, which is not limited here.

A method for judging cross-area coverage provided by the present application firstly determines the first coverage area of the evaluation base station according to the coordinate system of the evaluation base station and the fixed direction angle a1, then calculates the nearest base station of the evaluation base station within the first coverage area, and then according to The direction angle a2 of the nearest base station determines the second coverage area. Finally, according to the distance Dab between the evaluation base station and the nearest base station, Dn and the number M of mobile terminals in the second coverage area, it is judged whether the serving cell to which the evaluation base station belongs is over-covered, which can save a lot of time for judging the over-area problem. In addition, when the present application is applied to an antenna-feeder automatic optimization system, the ESC antenna can be driven to automatically adjust the downtilt angle, thereby forming an automatic judgment and closed-loop control of antenna optimization.

A device for judging cross-area coverage provided by the second embodiment of the present application is as follows:

In the above-mentioned embodiments, a method for judging over-area coverage is provided, and correspondingly, the present application also provides a device for judging over-area coverage.

As shown in FIG. 5 , it shows a schematic structural diagram of an apparatus for determining over-area coverage provided by an embodiment of the present application, including the following modules.

The first determination module 11 is used to obtain the coordinate system and the direction angle a1 of the evaluation base station, and determine the first coverage area of the evaluation base station according to the coordinate system and the direction angle a1 of the evaluation base station;

a second determining module 12, configured to determine the nearest base station of the evaluation base station within the first coverage area;

The third determination module 13 is used to calculate the direction angle a2 and the distance Dab between the evaluation base station and the nearest base station, and determine the second coverage according to the a2;

a first calculation module 14, configured to calculate the direction angle a3 and the distance Dn between each mobile terminal in the first coverage area and the evaluation base station;

a fourth determining module 15, configured to determine the mobile terminals within the second coverage according to the a3;

The judging module 16 is configured to judge whether the serving cell to which the evaluation base station belongs is over-covered according to the Dab, the Dn and the number M of mobile terminals within the second coverage area.

Optionally, as shown in FIG. 6 , the judging module 16 includes:

The first calculation sub-module 161 is used to count the number m of mobile terminals with Dn≥Dab, and calculate the ratio of m to the number M of mobile terminals within the second coverage area;

Judging sub-module 162, for judging whether the ratio is greater than or equal to the second threshold;

The first determination sub-module 163 is configured to determine if the serving cell is over-covered.

Optionally, as shown in FIG. 7 , the second determining module 12 includes:

The second calculation sub-module 121 is used to calculate the direction angle a4 between the evaluation base station and each surrounding base station;

The second determination sub-module 122 is configured to determine peripheral base stations that satisfy a preset condition, where the preset condition is a4<2a1;

The third determining sub-module 123 is configured to select, from the surrounding base stations that satisfy the preset condition, the base station that is closest to the evaluation base station and determine it as the closest base station.

Optionally, the first computing module 14 includes:

a fourth determination submodule, configured to acquire each mobile terminal within the first coverage area, and respectively determine a measurement report of each mobile terminal within the first coverage area, where the measurement report includes the latitude and longitude coordinates of each mobile terminal ;

The third calculation submodule is configured to calculate the direction angle a3 and the distance Dn between the mobile terminals and the evaluation base station in units of the mobile terminals according to the latitude and longitude coordinates of the mobile terminals.

Optionally, the first computing module 14 further includes:

The first filtering submodule is configured to filter out the mobile terminals whose signal level value reported to the evaluation base station is greater than or equal to a first threshold within the first coverage area.

Optionally, the first computing module 14 further includes:

a fifth determining submodule, configured to divide the grids into the first coverage area, and determine gridded data of each grid respectively, where the gridded data includes the coordinates of the center points of each grid;

The fourth calculation submodule is used to calculate the direction angle a3 and the distance Dn between the mobile terminals and the evaluation base station in units of the grid according to the coordinates of the center points of the grids, wherein the same Each mobile terminal within the grid has the same a3 and Dn.

Optionally, the gridded data includes the signal level value of the evaluation base station reported by each mobile terminal in each grid, and the first calculation module 14 further includes:

a fifth calculation submodule, configured to calculate the average value of the signal level values reported by the mobile terminal to the evaluation base station in each grid;

The second filtering submodule is configured to filter out the grids whose average value is greater than or equal to the first threshold.

Optionally, the first coverage area is a sector-shaped area in the coordinate system with the evaluation base station as the center and 2*a1 as the included angle, and the second coverage area is in the coordinate system with the evaluation base station as the center, 2*a2 is the fan-shaped area of the included angle.

It can be understood that the above embodiments are only exemplary embodiments adopted to illustrate the principle of the present invention, but the present invention is not limited thereto. For those skilled in the art, without departing from the spirit and essence of the present invention, various modifications and improvements can be made, and these modifications and improvements are also regarded as the protection scope of the present invention.

Claims (14)

1. A method for determining a handover coverage, comprising:

acquiring a coordinate system and a direction angle a1 of an evaluation base station, and determining a first coverage range of the evaluation base station according to the coordinate system and the direction angle a1 of the evaluation base station;

determining a nearest base station of the evaluation base stations within the first coverage area;

calculating a direction angle a2 and a distance Dab between the evaluation base station and the nearest base station, and determining a second coverage according to the a 2;

calculating a direction angle a3 and a distance Dn between each mobile terminal in the first coverage area and the evaluation base station;

determining mobile terminals in the second coverage area according to the a 3;

judging whether the service cell to which the evaluation base station belongs is covered by a handover area or not according to the Dab, the distance Dn between the mobile terminal in the second coverage area and the evaluation base station and the number M of the mobile terminals in the second coverage area; the step of judging whether the serving cell to which the evaluation base station belongs is covered by the handover according to the Dab, the distance Dn between the mobile terminal in the second coverage and the evaluation base station and the number M of the mobile terminals in the second coverage comprises:

counting the number M of the mobile terminals with Dn being more than or equal to Dab, and calculating the proportion of M in the number M of the mobile terminals in the second coverage area;

judging whether the proportion is larger than or equal to a second threshold value;

and if so, judging the cross-area coverage of the service cell.

2. The method of claim 1, wherein said step of determining the nearest base station of said evaluating base stations within said first coverage area comprises:

calculating direction angles a4 between the evaluation base station and each peripheral base station;

determining peripheral base stations meeting preset conditions, wherein the preset conditions are a4<2a 1;

and selecting the base station closest to the evaluation base station from the peripheral base stations meeting the preset conditions to be determined as the closest base station.

3. The method of claim 1, wherein the step of calculating the direction angle a3 and the distance Dn between each mobile terminal in the first coverage area and the evaluation base station comprises:

acquiring each mobile terminal in the first coverage range, and respectively determining a measurement report of each mobile terminal in the first coverage range, wherein the measurement report comprises longitude and latitude coordinates of each mobile terminal;

and calculating a direction angle a3 and a distance Dn between each mobile terminal and the evaluation base station by taking each mobile terminal as a unit according to the longitude and latitude coordinates of each mobile terminal.

4. The method of claim 3, wherein the measurement report further includes signal level values of an evaluation base station reported by each mobile terminal, and the step of calculating the direction angle a3 and the distance Dn between each mobile terminal and the evaluation base station in units of each mobile terminal according to longitude and latitude coordinates of each mobile terminal comprises:

screening out the mobile terminals with the signal level value which is reported to the evaluation base station in the first coverage range and is greater than or equal to a first threshold value.

5. The method of claim 1, wherein the step of calculating the direction angle a3 and the distance Dn between each mobile terminal in the first coverage area and the evaluation base station further comprises:

dividing grids into the first coverage range, and respectively determining rasterization data of each grid, wherein the rasterization data comprise coordinates of a central point of each grid;

and calculating a direction angle a3 and a distance Dn between each mobile terminal and the evaluation base station by taking the grids as a unit according to the coordinates of the central point of each grid, wherein each mobile terminal in the same grid has the same a3 and Dn.

6. The method of claim 5, wherein the rasterized data includes signal level values of an evaluation base station reported by each mobile terminal in each grid, and wherein the method further comprises, before calculating the distance Dn between each mobile terminal and the evaluation base station and the direction angle a3 of each mobile terminal in the first coverage area in units of the grid, the method further comprising:

calculating the average value of the signal level values reported to the evaluation base station by the mobile terminal in each grid;

and screening out grids with the average value larger than or equal to a first threshold value.

7. The method of claim 1, wherein the first coverage area is a sector area with the estimated base station as a center and 2a1 as an included angle in the coordinate system, and the second coverage area is a sector area with the estimated base station as a center and 2a2 as an included angle in the coordinate system.

8. A device for determining a handover coverage, comprising:

the first determination module is used for acquiring a coordinate system and a direction angle a1 of an evaluation base station and determining a first coverage range of the evaluation base station according to the coordinate system and the direction angle a1 of the evaluation base station;

a second determining module, configured to determine a nearest base station of the evaluation base stations within the first coverage area;

a third determining module, configured to calculate a direction angle a2 and a distance Dab between the evaluation base station and the nearest base station, and determine a second coverage according to the a 2;

a first calculating module, configured to calculate a direction angle a3 and a distance Dn between each mobile terminal and the evaluation base station in the first coverage area;

a fourth determining module, configured to determine, according to the a3, the mobile terminals in the second coverage area;

a judging module, configured to judge whether a serving cell to which the evaluation base station belongs is covered by a handover according to the Dab, a distance Dn between the mobile terminal in the second coverage and the evaluation base station, and the number M of mobile terminals in the second coverage;

the judging module comprises:

the first calculation submodule is used for counting the number M of the mobile terminals with Dn being more than or equal to Dab, and calculating the proportion of M in the number M of the mobile terminals in the second coverage range;

the judgment submodule is used for judging whether the proportion is larger than or equal to a second threshold value;

and the first determining submodule is used for judging the cross-area coverage of the service cell if the cross-area coverage of the service cell is judged.

9. The apparatus for determining handoff coverage according to claim 8, wherein said second determining module comprises:

a second calculation submodule for calculating a direction angle a4 between the evaluation base station and each peripheral base station;

the second determining submodule is used for determining the peripheral base stations meeting the preset condition, and the preset condition is a4<2a 1;

and the third determining submodule is used for selecting the base station closest to the evaluation base station from the peripheral base stations meeting the preset condition to determine the base station closest to the evaluation base station.

10. The apparatus for determining handoff coverage according to claim 8, wherein said first calculating means comprises:

a fourth determining submodule, configured to acquire each mobile terminal in the first coverage area, and determine a measurement report of each mobile terminal in the first coverage area, where the measurement report includes longitude and latitude coordinates of each mobile terminal;

and the third calculation submodule is used for calculating the direction angle a3 and the distance Dn between each mobile terminal and the evaluation base station by taking each mobile terminal as a unit according to the longitude and latitude coordinates of each mobile terminal.

11. The apparatus for determining handoff coverage according to claim 10, wherein said first calculation module further comprises:

and the first filtering submodule is used for screening out the mobile terminals of which the signal level values reported to the evaluation base station in the first coverage range are greater than or equal to a first threshold value.

12. The apparatus for determining handoff coverage according to claim 8, wherein said first calculation module further comprises:

a fifth determining submodule, configured to divide the first coverage into grids, and determine rasterized data of each grid, where the rasterized data includes coordinates of a center point of each grid;

and the fourth calculation submodule is used for calculating the direction angle a3 and the distance Dn between each mobile terminal and the evaluation base station by taking the grids as a unit according to the coordinates of the center point of each grid, wherein each mobile terminal in the same grid has the same a3 and the same Dn.

13. The apparatus for determining handoff coverage according to claim 12, wherein the rasterized data includes signal level values of the evaluation base station reported by each mobile terminal in each cell, and the first calculating module further includes:

a fifth calculating submodule, configured to calculate an average value of signal level values reported to the evaluation base station by the mobile terminal in each grid;

and the second filtering submodule is used for screening out the grids with the average value larger than or equal to the first threshold value.

14. The apparatus of claim 8, wherein the first coverage area is a sector area of the coordinate system centered at the evaluation base station and having an angle of 2a1, and the second coverage area is a sector area of the coordinate system centered at the evaluation base station and having an angle of 2a 2.

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