CN110012486B - Method and device for judging cross-zone coverage - Google Patents
Method and device for judging cross-zone coverage Download PDFInfo
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- CN110012486B CN110012486B CN201910291679.7A CN201910291679A CN110012486B CN 110012486 B CN110012486 B CN 110012486B CN 201910291679 A CN201910291679 A CN 201910291679A CN 110012486 B CN110012486 B CN 110012486B
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Abstract
The application discloses a method for judging cross-zone coverage, which comprises the following steps: acquiring a coordinate system and a direction angle a1 of the 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 a first coverage range; calculating a direction angle a2 and a distance Dab between the evaluation base station and the nearest base station, and determining a second coverage range according to a 2; calculating a direction angle a3 and a distance Dn between each mobile terminal and the evaluation base station in the first coverage area; determining mobile terminals within the second coverage area according to a 3; and judging whether the service cell to which the base station belongs is evaluated to be in handover coverage according to the Dab, the Dn of the mobile terminals in the second coverage and the number M. The method and the device can judge whether the service cell to which the evaluation base station belongs is covered by the cross-zone, can greatly save the judgment time of the cross-zone problem, and can be used as a self-optimization judgment basis of an antenna feeder system.
Description
Technical Field
The invention belongs to the technical field of data processing, and particularly relates to a method and a device for judging cross-zone coverage.
Background
The existing stock base station antenna of the domestic operator reaches millions of payments, the coverage based on the cross-area of the antenna causes the deterioration of the coverage, quality and capacity of a mobile communication network, the antenna feeder occupies most of workload of daily operation and maintenance optimization, and the discovery of the problem of the whole coverage of the antenna is a difficult problem in the industry. In the face of the upcoming 5G network deployment, the automatic optimization based on antenna feeder is a great challenge and a fundamental part of the current network operation to the automatic, intelligent and intelligent network optimization transformation.
The existing method for judging antenna feeder handover coverage has many problems, namely, an evaluation object is a grid instead of a handover cell. Or there is a normal situation where a plurality of signal sources in different directions cover the same area (specific grid), and it takes a lot of time to determine whether to perform handover coverage. A reasonable antenna feeder cross-area coverage method is found, and the method has important significance for improving automatic optimization and network optimization transformation of the antenna feeder in the future.
Disclosure of Invention
The application provides a method and a device for judging cross-zone coverage, aiming at the problems that the existing method for judging the cross-zone coverage of the antenna feeder has a plurality of problems, an evaluation object is not a cross-zone cell, and whether the cross-zone coverage wastes a large amount of time or not.
The application provides a method for judging cross-zone coverage, which comprises the following steps:
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;
and judging whether the service cell to which the evaluation base station belongs is covered by the cross-area according to the Dab, the Dn of the mobile terminals in the second coverage area and the number M.
Optionally, the step of determining whether the serving cell to which the evaluation base station belongs is covered by a handover area according to the Dab, Dn of the mobile terminals in the second coverage area, and the number M includes:
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.
Optionally, the step of determining the nearest base station of the evaluation base stations in the first coverage area includes:
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.
Optionally, the step of calculating a direction angle a3 and a distance Dn between each mobile terminal in the first coverage area and the evaluation base station includes:
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.
Optionally, before the step of calculating, by using each mobile terminal as a unit, a direction angle a3 and a distance Dn between each mobile terminal and the evaluation base station according to the longitude and latitude coordinates of each mobile terminal, the measurement report further includes a signal level value of the evaluation base station reported by each mobile terminal, including:
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.
Optionally, the step of calculating a direction angle a3 and a distance Dn between each mobile terminal and the evaluation base station in the first coverage area further includes:
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.
Optionally, before the calculating, by using the grid as a unit, a distance Dn between each mobile terminal and the evaluation base station in the first coverage area and a direction angle a3 of each mobile terminal, the rasterizing data includes a signal level value of the evaluation base station reported by each mobile terminal in each grid, and the method further includes:
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.
Optionally, the first coverage area is a sector area with the evaluation base station as a center and 2 × a1 as an included angle in the coordinate system, and the second coverage area is a sector area with the evaluation base station as a center and 2 × a2 as an included angle in the coordinate system.
The present application also provides a device for determining handover coverage, including:
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;
and the judging module is used for judging whether the service cell to which the evaluation base station belongs covers the area to be covered according to the Dab, the Dn of the mobile terminals in the second coverage range and the number M.
Optionally, the determining module includes:
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.
Optionally, the second determining module includes:
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.
Optionally, the first computing module includes:
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.
Optionally, the first computing module further includes:
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.
Optionally, the first computing module further includes:
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.
Optionally, the rasterized data includes signal level values of an evaluation base station reported by each mobile terminal in each raster, 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.
Optionally, the first coverage area is a sector area with the evaluation base station as a center and 2 × a1 as an included angle in the coordinate system, and the second coverage area is a sector area with the evaluation base station as a center and 2 × a2 as an included angle in the coordinate system.
According to the method for judging the handover coverage, a first coverage range of an evaluation base station is determined according to a coordinate system of the evaluation base station and a fixed direction angle a1, then the nearest base station of the evaluation base station in the first coverage range is calculated, and a second coverage range is determined according to a direction angle a2 of the nearest base station. And finally, judging whether the service cell to which the evaluation base station belongs covers the cross-region according to the distance Dab between the evaluation base station and the nearest base station, and the Dn and the number M of the mobile terminals in the second coverage range, so that the judgment time of the cross-region problem can be greatly saved. In addition, when the antenna is applied to an antenna feeder automatic optimization system, the electrically-adjusted antenna can be driven to automatically adjust the downward inclination angle, and automatic judgment and closed-loop control of antenna optimization are formed.
Drawings
Fig. 1 is a flowchart of a method for determining a handover coverage according to a first embodiment of the present application;
fig. 2 is a flowchart of step S2 in fig. 1 according to a first embodiment of the present disclosure;
fig. 3 is a flowchart of step S6 in fig. 1 according to the first embodiment of the present application;
fig. 4 is a schematic view of the coverage provided by the first embodiment of the present application;
fig. 5 is a schematic structural diagram of a device for determining coverage of a handover according to a second embodiment of the present application;
fig. 6 is another schematic structural diagram of a device for determining coverage of a handover according to a second embodiment of the present application;
fig. 7 is another schematic structural diagram of a device for determining coverage of a handover according to a second embodiment of the present application.
Detailed Description
In order to make the technical solutions of the present invention better understood, the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
The application provides a method and a device for judging cross-zone coverage. The following detailed description is made with reference to the drawings of the embodiments provided in the present application, respectively.
A method for determining a handover coverage according to a 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 determining a handover coverage provided by the embodiment of the present application, and includes the following steps.
Step S1, obtaining the coordinate system and the direction angle a1 of the evaluation base station, and determining the first coverage area of the evaluation base station according to the coordinate system and the direction angle a1 of the evaluation base station.
An antenna feeder is a short term antenna feeder system, and an antenna feeder system means that an antenna radiates electromagnetic waves to a surrounding space. The cross-area coverage based on the antenna causes the deterioration of the coverage, quality and capacity of a mobile communication network, and the antenna feeder occupies most of the workload of daily operation and maintenance optimization, so the method for judging the cross-area coverage of the antenna feeder is provided
In this step, a coordinate system and a direction angle a1 of each evaluation base station are first obtained, where the direction angle a1 is fixed, and a specific value may be set as required, and is not limited herein. The coordinate system takes the evaluation base station as an origin, the north direction is a Y axis, the east direction is an X axis, and longitude and latitude coordinates of the evaluation base station need to be obtained. As shown in fig. 4, the base station a is the origin of the coordinate system, the east direction of the base station a is the X axis, and the north direction of the base station a is the Y axis. The first coverage area is a sector area with the evaluation base station as a center and 2 × a1 as an included angle in the coordinate system.
Step S2, determining the nearest base station of the evaluation base stations in the first coverage area.
Preferably, as shown in fig. 2, the step S2 of determining the nearest base station of the evaluation base stations in the first coverage area includes:
in step S201, a direction angle a4 between the evaluation base station and each peripheral base station is calculated.
Step S202, peripheral base stations meeting preset conditions are determined, wherein the preset conditions are a4<2a 1.
Step S203, selecting a base station closest to the evaluation base station from the peripheral base stations meeting the preset condition, and determining the selected base station as the closest base station.
In the step, any evaluation base station is taken as an evaluation object, the direction angle a4 between the evaluation base station and each peripheral base station is firstly calculated, the method is that the distance between the evaluation base station and each peripheral base station is calculated through acquiring the longitude and latitude coordinates of each peripheral base station, the longitude and latitude coordinates of each peripheral base station and the longitude and latitude coordinates of the evaluation base station by the pythagorean theorem, and the included angle between the X axis and the connection line of the evaluation base station and the peripheral base station is calculated through the arctangent function, namely the direction angle a4 between the evaluation base station and each peripheral base station. And according to the calculated direction angle a4, judging whether each peripheral base station meets a4<2a1, namely whether each peripheral base station falls in the first coverage area. And screening out a base station closest to the evaluation base station from among the peripheral base stations falling within the first coverage area as a closest base station of the evaluation base station. For the reasons to be explained, the parameters of the configuration of the background neighbor cell are not generally adopted, and the missing and mismatching of the configuration data of the neighbor cell are prevented.
Step S3, calculating the direction angle a2 and the distance Dab between the evaluation base station and the nearest base station, and determining a second coverage range according to the a 2.
In this step, after the nearest base station of the evaluation base stations 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 the second coverage area is determined to be a sector area in the coordinate system with the evaluation base station as the center of circle and 2 × a2 as 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 connecting line of the base station B and the base station A and the X axis is a direction angle a2 between the base station B and the base station A, and the distance between the base station A and the base station B is Dab. The area in fig. 4 is not the second coverage area, and the second coverage area is larger than the area in fig. 4, and is a sector area with the center of the base station a as a center and an included angle of 2 × a 2.
Step S4, calculating a direction angle a3 and a distance Dn between each mobile terminal in the first coverage area and the evaluation base station.
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, includes:
step 1), obtaining each mobile terminal in the first coverage area, and respectively determining a measurement report of each mobile terminal in the first coverage area, wherein the measurement report comprises longitude and latitude coordinates of each mobile terminal.
And 2) 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.
Preferably, the measurement report further includes signal level values of the evaluation base stations reported by the mobile terminals, and before step 2), the method includes:
and 3), 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.
In this step, a measurement report with a high-precision coordinate system is introduced, which is automatically reported by the mobile terminal (MR sampling point) within the first coverage of the evaluation base station. The measurement report comprises longitude and latitude coordinates of each mobile terminal and a signal level value of the evaluation base station reported by each mobile terminal. And calculating the distance Dn between the evaluation base station and each mobile terminal according to the longitude and latitude coordinates of each mobile terminal in the first coverage range and the longitude and latitude coordinates of the evaluation base station through the Pythagorean theorem, and calculating an included angle between the X axis and a connecting line between the evaluation base station and each mobile terminal through an arctangent function, namely a 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 for filtering the MR sampling points. And counting and filtering sampling points with the signal level value of the evaluation base station reported by each mobile terminal being larger than or equal to the first threshold value, so as to ensure that the signal value of the evaluation object is in a certain range, and the requirements of service and business can be met. The first threshold needs to be preset according to requirements, and is not limited herein.
Preferably, the step S4, calculating a direction angle a3 and a distance Dn between each mobile terminal in the first coverage area and the evaluation base station, further includes:
step 4), dividing grids for the first coverage range, and respectively determining rasterization data of each grid, wherein the rasterization data comprise coordinates of a center point of each grid;
and 5) 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.
Preferably, the rasterized data includes signal level values of the evaluation base station reported by each mobile terminal in each raster, and before step 5), the method further includes:
step 6), calculating the average value of the signal level values reported to the evaluation base station by the mobile terminal in each grid;
and 7) screening out the grids with the average value larger than or equal to the first threshold value.
In this step, grids uniformly divided in advance for the first coverage are introduced, and rasterized data for each grid is acquired. The plurality of mobile terminals may fall in the same grid, and the rasterized data includes coordinates of center points of the grids and signal level values of the evaluation base station reported by the mobile terminals in the grids. For convenience of calculation, the longitude and latitude of all MR sampling points of the evaluation object cell falling in the grid are represented by the longitude and latitude of the center of the grid in a unified mode. And calculating the distance Dn between the evaluation base station and the coordinates of the center points of the grids through the Pythagorean theorem according to the coordinates of the center points of the grids in the first coverage range and the longitude and latitude coordinates of the evaluation base station, namely the distance Dn between the evaluation base station and all the mobile terminals in the grids. And calculating the included angle between the X axis and the coordinate connection line of the evaluation base station and the central point of each grid through an arctangent function, namely the direction angle a3 between the evaluation base station and all the 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 for filtering the MR sampling points in each grid. And taking the average value of the signal level values of the evaluation base stations reported by the mobile terminals in each grid as the signal level value of the grid, and counting and filtering the grids with the average value of the signal level values of the evaluation base stations reported by the mobile terminals in each grid being more than or equal to a first threshold value to ensure that the signal value of the evaluation object is in a certain range, thereby meeting the requirements of service and business. The first threshold value needs to be preset according to requirements.
Note that, in step S4, the direction angle a3 and the distance Dn between each mobile terminal in the first coverage area and the evaluation base station are calculated.
And step S5, determining the mobile terminals in the second coverage area according to the a 3.
In this step, mobile terminals falling within the second coverage range, i.e. mobile terminals satisfying a3<2a2, are determined from said a 3. For example, as shown in fig. 4, when the base station a is an evaluation base station and the selected nearest base station is the base station B, the reasonable coverage distance of the second coverage area of the base station a is D-ab; and the home MR sampling points MR1-MRn in the second coverage range of the base station A respectively have Dn distance values with the base station A. Each sampling point MRn corresponds to a direction angle a3, and the direction angle a3 is an included angle between a connection line of each sampling point MRn and the evaluation base station and the X axis.
And step S6, judging whether the service cell to which the evaluation base station belongs is covered by the area according to the Dab, the Dn of the mobile terminals in the second coverage area and the number M.
Preferably, as shown in fig. 3, the step S6, determining whether the serving cell to which the evaluation base station belongs is covered by a handover according to the Dab, Dn of the mobile terminals in the second coverage area, and the number M, includes:
step S601, 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.
Step S602, determining whether the ratio is greater than or equal to a second threshold, if so, performing step S603; if not, the process is ended.
Step S603, determining the serving cell handover coverage.
The core idea of the present application is that according to the planning design requirement, the effective coverage of any mobile communication base station cannot exceed its nearest neighboring cell (the ideal coverage distance is 2/3 × D, where Dab is the distance between the serving cell and its nearest base station in the coverage direction).
In the step, the number M of the mobile terminals with Dn being more than or equal to Dab is counted, and the proportion of M in the number M of the mobile terminals in the second coverage area is calculated. And judging whether the ratio is larger than or equal to a second threshold value, and if so, indicating that the number of the mobile terminals exceeding the distance between the evaluation base station and the nearest base station is overlarge, and indicating the cross-area coverage of the service cell. 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 handover coverage. The second threshold value needs to be preset according to requirements, and is not limited herein.
According to the method for judging the handover coverage, a first coverage range of an evaluation base station is determined according to a coordinate system of the evaluation base station and a fixed direction angle a1, then the nearest base station of the evaluation base station in the first coverage range is calculated, and a second coverage range is determined according to a direction angle a2 of the nearest base station. And finally, judging whether the service cell to which the evaluation base station belongs covers the cross-region according to the distance Dab between the evaluation base station and the nearest base station, and the Dn and the number M of the mobile terminals in the second coverage range, so that the judgment time of the cross-region problem can be greatly saved. In addition, when the antenna is applied to an antenna feeder automatic optimization system, the electrically-adjusted antenna can be driven to automatically adjust the downward inclination angle, and automatic judgment and closed-loop control of antenna optimization are formed.
A second embodiment of the present application provides a device for determining a handover coverage as follows:
in the above embodiments, a method for determining handover coverage is provided, and correspondingly, a device for determining handover coverage is also provided.
Fig. 5 is a schematic structural diagram illustrating a device for determining a handover coverage according to an embodiment of the present application, and includes the following modules.
The first determining module 11 is configured to obtain a coordinate system and a direction angle a1 of an evaluation base station, and determine a 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 a nearest base station of the evaluation base stations in the first coverage area;
a third determining module 13, 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 14, configured to calculate a direction angle a3 and a distance Dn between each mobile terminal in the first coverage area and the evaluation base station;
a fourth determining module 15, configured to determine, according to the a3, the mobile terminals in the second coverage area;
and a judging module 16, configured to judge whether the serving cell to which the evaluation base station belongs is covered by a handover according to the Dab, Dn of the mobile terminals in the second coverage area, and the number M.
Optionally, as shown in fig. 6, the determining module 16 includes:
the first calculating submodule 161 is configured to count the number M of mobile terminals with Dn being greater than or equal to Dab, and calculate a ratio of M to the number M of mobile terminals in the second coverage area;
a judgment submodule 162 configured to judge whether the ratio is greater than or equal to a second threshold;
a first determining submodule 163, configured to determine the serving cell handover coverage if yes.
Optionally, as shown in fig. 7, the second determining module 12 includes:
a second calculation submodule 121 configured to calculate a direction angle a4 between the evaluation base station and each peripheral base station;
a second determining submodule 122, configured to determine a peripheral base station that meets a preset condition, where the preset condition is a4<2a 1;
a third determining submodule 123, configured to select, from the peripheral base stations that satisfy the preset condition, a base station closest to the evaluation base station to be determined as the closest base station.
Optionally, the first calculating module 14 includes:
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.
Optionally, the first calculating module 14 further includes:
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.
Optionally, the first calculating module 14 further includes:
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.
Optionally, the rasterized data includes signal level values of evaluation base stations reported by mobile terminals in each raster, and the first calculating module 14 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.
Optionally, the first coverage area is a sector area with the evaluation base station as a center and 2 × a1 as an included angle in the coordinate system, and the second coverage area is a sector area with the evaluation base station as a center and 2 × a2 as an included angle in the coordinate system.
It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the 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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