CN111246489B - Method and device for determining cell relation - Google Patents
Method and device for determining cell relation Download PDFInfo
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- CN111246489B CN111246489B CN202010014655.XA CN202010014655A CN111246489B CN 111246489 B CN111246489 B CN 111246489B CN 202010014655 A CN202010014655 A CN 202010014655A CN 111246489 B CN111246489 B CN 111246489B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/18—Network planning tools
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/24—Cell structures
- H04W16/30—Special cell shapes, e.g. doughnuts or ring cells
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/24—Cell structures
- H04W16/32—Hierarchical cell structures
Abstract
The invention relates to a method and a device for determining cell relation, wherein the correction method comprises the following steps: acquiring longitude and latitude and azimuth angles of each cell; (2) determining the range of the layer circle: drawing at least one circle by taking a planned cell as a circle center, setting the radius of a first layer circle to be M meters, and expanding one layer circle every time, wherein the radius is increased by M meters; and (3) partitioning and drawing a parabola: dividing the circle drawn in the step (2) into a plurality of sector areas by taking the planned cell as a circle center and taking the north direction as an initial position, then obtaining the position of a base station which is closest to the circle center in each sector area, taking the radius of the base station cell which passes through the relation of the layer circle to be confirmed as a central axis, and then drawing a rotating parabola by taking the base station cell which passes through the relation of the layer circle to be confirmed as a vertex to obtain a cell of the layer circle relation; (4) calculating the direction attribute of the layer circle cell; (5) And (3) after the calculation of the first layer circle relationship is finished, removing the base station cells belonging to the first layer circle, and then circulating the steps (2) to (4) to calculate the layer circle relationships of a plurality of external expansions.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for determining a cell relationship.
Background
From the last 80 s, mobile communication systems introduced networking of cellular structures, which were characterized by dividing all areas to be covered into several smaller areas, setting up a base station in each area to serve users in the coverage area of the area, and allowing users in the areas covered by different base stations to communicate. Each base station of the cellular mobile communication system is arranged at intervals in a coverage area, each base station can be divided into 1-N cells in the coverage area, and the cells which are separated from each other by a plurality of cells can use the same frequency, so that the same frequency can be repeatedly used, thereby improving the system capacity. In a communication system, allocation of code resources is planned with reference to cell relations. Generally, if the same code resource is allocated to cells with closer relationships, the interference in the communication network will be larger, and if the same code resource is allocated to cells with farther relationships, the interference in the communication network will be smaller. Therefore, in order to make the allocation of code resources reasonable, a more accurate cell relation needs to be determined before the code resource allocation.
Chinese patent document (201410733855.5) discloses a method and apparatus for determining cell relations, which can obtain each neighboring cell needing to calculate the cell relation with a target cell based on the spatial distance between the cells, thereby obtaining more accurate cell relations. The method comprises the following steps: acquiring a layer of adjacent cells of a target cell, wherein the layer of adjacent cells of the target cell are cells of which the spatial distance with the target cell is smaller than a first preset value; and determining a first cell relation value between the target cell and a layer of adjacent cells of the target cell, wherein the first cell relation value is used for indicating the cell relation between the target cell and the layer of adjacent cells of the target cell. The method is mainly determined by the distance between the adjacent cell and the target cell, and certain errors exist.
Therefore, there is a need to develop a method and apparatus for determining cell relationships, so as to obtain cell relationships, improve accuracy, and effectively reduce errors introduced by coordinate transformation.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a method for determining a cell relation, so as to obtain the cell relation, improve accuracy, and effectively reduce errors introduced by coordinate transformation.
In order to solve the technical problems, the invention adopts the technical scheme that: the method for determining the cell relation comprises the following steps:
(1) Acquiring longitude and latitude and azimuth angles of each cell;
(2) Determining the range of the layer circle: drawing at least one circle by taking a planning cell as a circle center, setting the radius of a first circle layer to be M meters, and expanding one circle layer outwards every time, wherein the radius is increased by M meters;
(3) Partitioning and drawing a parabola: dividing the circle drawn in the step (2) into a plurality of sector areas by taking the planned cell as a circle center and the north direction as an initial position, then obtaining the position of a base station closest to the circle center of each sector area, taking the radius of the base station cell passing through the relation of the layer circle to be confirmed as a central axis, and then drawing a rotating parabola by taking the base station cell of the layer circle to be confirmed as a vertex to obtain a layer circle relation cell;
(4) And calculating the direction attribute of the layer circle cell.
The further improvement of the invention is that the method also comprises the steps of (5) removing the base station cell belonging to the first layer circle after the calculation of the first layer circle relation is completed, and then circulating the steps (2) to (4) to calculate a plurality of outer expanded layer circle relations.
As a preferred technical solution of the present invention, the longitude and latitude and the azimuth angle of each cell in the step (1) are obtained from an existing network engineering parameter table.
As a preferred technical solution of the present invention, the step (3) specifically includes the steps of:
s31, drawing a sector at every 18 degrees by taking a planned cell as a circle center and taking the north direction as an initial position, and equally dividing the circle into 20 sector areas;
s32, acquiring a base station closest to the circle center in each sector area, and simultaneously removing the base station selected previously;
s33, drawing a rotating parabola by taking the radius of the base station cell passing through the layer-to-layer relation to be confirmed as a central axis and then taking the base station cell of the layer-to-layer relation to be confirmed as a vertex;
s34, removing the base station cell in the parabola to obtain a layer circle relation cell.
As a preferred technical solution of the present invention, when calculating the layer direction attribute in step (4), based on the azimuth angle of the current planned cell, the base station cells within the range of 90 ° to the left and 90 ° to the right of the azimuth angle of the cell are forward direction relation cells, and the other side belongs to a backward direction relation cell.
As a preferred embodiment of the present invention, the formula for drawing the parabola in the step S33 is:
θ: is a parabolic rotation angle;
a: the parabolic parameter is set to be 0.85 and can be adjusted according to actual conditions;
b: the parabola parameter is set to be 0 and can be adjusted according to the actual situation;
c: selecting the distance between a base station cell and a planning cell;
and t is the planned cell location.
As a preferred embodiment of the present invention, in step S33, if there are several cells to be confirmed, the drawing is started from the base station cell closest to the center of the circle.
As a preferred technical scheme of the invention, the relation of three layers of cells is calculated, three layer circles are arranged, the radius is respectively set to be 1000 meters, 2000 meters and 3000 meters by taking a planning cell as a center, the true north direction by taking the planning cell as a center is taken as an initial position, each 18 degrees is divided into a sector area, and the sector areas are divided into 20 sector areas in total.
The technical problem to be solved by the present invention is to provide a device for determining a cell relation, so as to obtain the cell relation, improve accuracy, and effectively reduce errors introduced by coordinate transformation.
In order to solve the technical problems, the invention adopts the technical scheme that:
the device for determining the cell relation comprises a unit for acquiring longitude, latitude and azimuth angles, a unit for calculating the range of a layer circle and a partition unit, a unit for drawing a parabola and a unit for generating the layer circle relation,
the longitude, latitude and azimuth acquiring unit is used for acquiring the longitude, latitude and azimuth of the acquired cell of the cell;
the calculation layer ring range and the partition unit are used for calculating the layer ring;
the parabola drawing unit is used for drawing parabolas for the base station cells within the range of the layer circle and eliminating the base station cells within the parabolas so as to avoid cell interference;
and the circle relation generating unit is used for calculating the regional attribute of the rest cells after removing the base station cells which do not meet the requirements, and calculating the forward cell or the backward cell.
Compared with the prior art, the invention has the following advantages and beneficial effects: the method and the device for determining the cell relation can obtain the cell relation, improve the accuracy, effectively reduce errors introduced by coordinate conversion and provide a basis for various economic constructions and activities.
Drawings
The technical scheme of the invention is further described by combining the accompanying drawings as follows:
fig. 1 is a schematic flow chart of a method of determining cell relations of the present invention;
fig. 2 is a schematic diagram of circle drawing and circle range determination in the method for determining a cell relation according to the present invention;
fig. 3 is a schematic diagram of a base station cell with each sector area of the first layer circle closest to the center of the circle obtained in the method for determining cell relations of the present invention;
FIG. 4 is a diagram illustrating a parabolic curve in the method for determining cell relations of the present invention; the parabola taking the P1 cell as the vertex contains the P2 cell, and the P2 base station cell is closer to the P1, so that the P2 cell is excluded from the layer circle relationship planned at this time; the situation that other cells are contained in the parabola does not occur in other base station cells;
FIG. 5 is a schematic diagram of a method for determining cell relations according to the present invention, in which cells within a parabola are removed; wherein P2 is a base station cell within the parabola;
FIG. 6 is a diagram illustrating an apparatus for determining cell relations according to the present invention;
601-obtaining longitude and latitude and azimuth angle units; 602-calculating a layer circle range and a partition unit; 603-drawing a parabolic unit; 604-generating a layer circle relation unit;
fig. 7 is a schematic diagram of a selected cell in the method of determining cell relations according to embodiment 3 of the present invention;
fig. 8 is a schematic diagram of circle drawing and layer circle range determination in the method for determining a cell relation according to embodiment 3 of the present invention;
fig. 9 is a schematic diagram of acquiring a base station cell closest to the center of a circle of each sector area of a first layer circle in the method for determining a cell relation according to embodiment 3 of the present invention;
fig. 10 is a diagram for plotting a parabola in the method for determining a cell relation according to embodiment 3 of the present invention;
fig. 11 is a schematic diagram of removing cells in a parabola in the method for determining cell relations according to embodiment 3 of the present invention, where the remaining cells are relational cells of a first layer of circles;
fig. 12 is a schematic diagram of step (5) in the method of determining cell relations according to embodiment 3 of the present invention;
fig. 13 is a schematic diagram of acquiring a cell of the second layer circle, which is closest to the center of the circle, from each sector area when calculating a relation cell of the second layer circle in the method for determining a cell relation according to embodiment 3 of the present invention;
fig. 14 is a diagram illustrating a parabola drawn when a relation cell of a second layer circle is calculated in the method for determining a cell relation according to embodiment 3 of the present invention.
Detailed Description
For the purpose of enhancing the understanding of the present invention, the present invention will be described in further detail with reference to the accompanying drawings and examples, which are provided for the purpose of illustration only and are not intended to limit the scope of the present invention.
Example 1: as shown in fig. 1 to 5, the method for determining cell relations includes the following steps:
(1) Acquiring longitude and latitude and azimuth angles of each cell;
(2) Determining the range of the layer circle: drawing at least one circle by taking a planned cell as a circle center, setting the radius of a first layer circle to be M meters, and expanding one layer circle every time, wherein the radius is increased by M meters; (M is 2 times the average inter-site distance, and the general area can be set to M =1000 meters), as shown in fig. 2
(3) Partitioning and drawing a parabola: dividing the circle drawn in the step (2) into a plurality of sector areas by taking a planned cell as a circle center and taking the north direction as an initial position, then obtaining the position of a base station of each sector area closest to the circle center, and drawing a rotating parabola by taking the radius of the base station cell passing through the relation of the layer circle to be confirmed as a central axis and taking the base station cell of the relation of the layer circle to be confirmed as a vertex as shown in fig. 3, wherein the parabola is drawn for removing the base station and the cell which are close in distance and possibly have interference so as to determine the relation of the layer circle of the base station cell; obtaining a layer circle relation cell; drawing a sector at every 18 degrees by taking the planned cell as the center of a circle and the north direction as the start, and equally dividing the circle into 20 sector areas as shown in fig. 2;
the step (3) specifically comprises the following steps:
s31, drawing a sector at every 18 degrees by taking a planned cell as a circle center and taking the north direction as an initial position, and equally dividing the circle into 20 sector areas;
s32, acquiring a base station closest to the circle center in each sector area, and simultaneously removing the base station selected previously;
s33, drawing a rotating parabola by taking the radius of the base station cell passing through the layer-to-layer relation to be confirmed as a central axis and then taking the base station cell of the layer-to-layer relation to be confirmed as a vertex;
the formula for drawing the parabola in the step S33 is:
θ: is a parabolic rotation angle;
a: the parabolic parameter is set to be 0.85 and can be adjusted according to actual conditions;
b: the parabola parameter is set to be 0 and can be adjusted according to the actual situation;
c: selecting the distance between a base station cell and a planning cell;
t is the planned cell location;
in step S33, if there are a plurality of cells to be confirmed, drawing is started from the base station cell closest to the center of the circle; as shown in fig. 4, where P1 is the base station cell closest to the center of the circle, P1 is the vertex, and the radius of the circle is the symmetry axis, a parabola is drawn;
s34, removing the base station cells in the parabola to obtain a layer circle relation cell; as shown in fig. 5, P2 is a base station cell in the parabola, and the base station cell is closer to the vertex of the parabola, so that it is excluded from the layer circle relationship of the planning; after the base station cells of other layer circles are removed through the process, the rest base station cells are the base station cells of the relation of the layer circle of the current time;
(4) Calculating the direction attribute of the layer circle cell;
when the layer circle direction attribute is calculated in the step (4), on the basis of the azimuth angle of the current planning cell, the base station cells within the range of 90 degrees in the left direction and 90 degrees in the right direction of the azimuth angle of the cell are forward relation cells, and the other side of the base station cell belongs to a backward relation cell; wherein the threshold value of the range of the azimuth angle can be adjusted according to the situation;
(5) After the calculation of the first layer circle relationship is completed, removing the base station cells belonging to the first layer circle, and then circulating the steps (2) to (4) to calculate a plurality of expanded layer circle relationships; after completing the calculation of a layer circle relation, removing the base station cells belonging to the layer circle relation of the next time, and then calculating the layer circle relation of the outer layer through the steps;
the longitude, latitude and azimuth angle of each cell in the step (1) are obtained from an engineering parameter table of the existing network;
generally, the relationship between three layers of cells is calculated, three layer circles are arranged, the radius is set to be 1000 meters, 2000 meters and 3000 meters respectively by taking a planned cell as a center, the true north direction by taking the planned cell as the center is taken as an initial position, each 18 degrees is divided into a sector area, and the sector areas are totally divided into 20 sector areas.
Example 2: the device for determining the cell relation comprises a longitude and latitude and azimuth acquiring unit 601, a circle-of-layer range and partition calculating unit 602, a parabola drawing unit 603 and a circle relation generating unit 604, wherein the longitude and latitude and azimuth acquiring unit 601 is used for acquiring the longitude and latitude and the azimuth of an acquired cell of the cell; the calculation layer circle range and partition unit 602 is configured to calculate a layer circle;
the parabola drawing unit 603 is configured to draw a parabola for the base station cell within the range of the layer circle, and exclude the base station cell within the parabola to avoid cell interference;
the circle relation generating unit 604 is configured to, after removing the base station cells that do not meet the requirement, calculate the area attribute of the remaining cells, and calculate a forward cell or a backward cell.
Example 3: in this embodiment, the method of embodiment 1 and the apparatus of embodiment 2 are used to select a cell in a certain area of a certain city to illustrate the determination of the cell relationship; as shown in fig. 7, taking the cell pointed by the arrow as an example, the relationship between the cell and other peripheral cells is calculated;
(1) Acquiring the longitude and latitude and azimuth angle of each cell from the existing network engineering parameter table;
(2) Drawing circles by taking the cell as the center of a circle, calculating 3 layer circles, and setting the radii of 1000 meters, 2000 meters and 3000 meters by taking a planned cell as the center, as shown in fig. 8;
(3) Partitioning and drawing a parabola: taking the planned cell as the central north direction as the starting point, dividing the planned cell into 20 sector areas every 18 degrees, as shown in fig. 9; and acquiring a base station cell of each sector area of the first layer circle, which is closest to the center of the circle, wherein the base station selected before needs to be removed, and drawing a rotating parabola by taking the radius of the layer circle as a central axis and the base station cell of the layer circle relation to be confirmed as a vertex. And if the number of the cells to be confirmed is more than one, drawing from the base station cell closest to the circle center. The parabola taking the P1 cell as the vertex contains the P2 cell, which indicates that the P2 base station cell is closer to P1, so the P2 cell is excluded from the layer circle relationship planned this time. The situation that other cells are contained in the parabola does not occur in other base station cells; as shown in figure 10 of the drawings,
(4) Calculating the direction attribute of the zone of the layer circle;
and removing the cells in the parabola, wherein the rest cells are the relation cells of the first layer circle. Based on the radius of the cell azimuth, finding out that the base station cell in the range of 90 degrees around the cell azimuth belongs to a forward relation cell (solid dot mark in the figure), and the other side belongs to a backward relation cell (hollow circle mark in the figure); as shown in fig. 11;
(5) After completing the calculation of one layer circle relation, removing the cells belonging to the layer circle relation of the next time, and then calculating a second layer circle relation; acquiring a cell of each fan-shaped area of the second layer circle, which is closest to the circle center; as shown in fig. 12; and taking the radius of the layer circle as a central axis, and drawing a rotating parabola by taking the cell of which the layer circle relation is to be confirmed as a vertex. If the number of the cells to be confirmed is multiple, drawing is started from the cell closest to the circle center. The parabola taking the P3 cell as the vertex contains the P4 cell, and the P4 cell is closer to the P3, so that the P4 cell is excluded from the layer circle relationship planned at this time; the parabola with the P5 cell as the vertex contains the P6 cell, which shows that the P6 cell is closer to P5, so the P6 cell is excluded from the layer circle relationship planned this time. The situation that other cells are contained in the parabola does not occur in other cells, and the situation is shown in fig. 13; the cells within the parabola are removed and the remaining cells are the relational cells of the second layer circle. And finding a diameter vertical to the radius on the basis of the radius to which the cell azimuth belongs, and taking the diameter as the attribute for distinguishing the cell directions. In the cell direction, one side belongs to the forward relationship cell (indicated by a solid dot in the figure), and the other side belongs to the backward relationship cell (indicated by a hollow circle in the figure), as shown in fig. 14.
It is obvious to those skilled in the art that the present invention is not limited to the above embodiments, and the invention is not limited to the above embodiments, and it is within the scope of the present invention to use the method concept and technical solution of the present invention directly in other fields without any substantial modification or improvement.
Claims (6)
1. A method of determining cell relationships, comprising the steps of:
(1) Acquiring longitude and latitude and azimuth angles of each cell;
(2) Determining the range of the layer circle: drawing at least one circle by taking a planned cell as a circle center, setting the radius of a first layer circle to be M meters, and expanding one layer circle every time, wherein the radius is increased by M meters;
(3) Partitioning and drawing a parabola: dividing the circle drawn in the step (2) into a plurality of sector areas by taking the planned cell as a circle center and taking the north direction as an initial position, then obtaining the position of a base station which is closest to the circle center in each sector area, taking the radius of the base station cell which passes through the relation of the layer circle to be confirmed as a central axis, and then drawing a rotating parabola by taking the base station cell which passes through the relation of the layer circle to be confirmed as a vertex to obtain a cell of the layer circle relation;
(4) Calculating the direction attribute of the zone of the layer circle;
the step (3) specifically comprises the following steps:
s31, drawing a sector at every 18 degrees by taking a planned cell as a circle center and taking the north direction as an initial position, and equally dividing the circle into 20 sector areas;
s32, acquiring a base station closest to the circle center in each sector area, and simultaneously removing the previously selected base station; s33, drawing a rotating parabola by taking the radius of the base station cell passing through the layer-to-layer relation to be confirmed as a central axis and then taking the base station cell of the layer-to-layer relation to be confirmed as a vertex;
s34, removing the base station cells in the parabola to obtain a layer circle relation cell;
when the layer circle direction attribute is calculated in the step (4), on the basis of the azimuth angle of the current planning cell, the base station cells within the range of 90 degrees in the left direction and 90 degrees in the right direction of the azimuth angle of the cell are forward relation cells, and the other side of the base station cell belongs to a backward relation cell;
the formula for drawing the parabola in step S33 is:
θ: is a parabolic rotation angle;
a: the parabola parameter is set to be 0.85 and can be adjusted according to actual conditions;
b: the parabolic parameter is set to be 0 and can be adjusted according to actual conditions;
c: selecting the distance between the base station cell and the planning cell;
and t is the planned cell location.
2. The method for determining cell relations according to claim 1, further comprising the step (5) of removing the base station cell belonging to the first layer circle after the first layer circle relation is calculated, and then circulating the steps (2) to (4) to calculate the layer circle relations of the plurality of outer expansions.
3. The method of claim 2, wherein the longitude and latitude and azimuth angle of each cell in step (1) are obtained from an engineering parameter table of an existing network.
4. The method of claim 1, wherein in step S33, if there are several cells to be confirmed, the drawing is started from the base station cell closest to the center of the circle.
5. The method of claim 4, wherein the three-layer cell relation is calculated, three layer circles are arranged, the radius is set to be 1000 m, 2000 m and 3000 m respectively by taking the planned cell as a center, the north direction is taken as a starting position by taking the planned cell as a center, and the planned cell is divided into 20 sector areas by dividing each sector area into 18 degrees.
6. An apparatus for determining cell relations using the method of any one of claims 1-5, wherein the apparatus for determining cell relations comprises a unit for obtaining longitude and latitude and azimuth, a unit for calculating horizon and partition, a unit for drawing a parabola, and a unit for generating a horizon relation,
the longitude, latitude and azimuth acquiring unit is used for acquiring the longitude, latitude and azimuth of the acquired cell of the cell;
the calculation layer ring range and the partition unit are used for calculating the layer ring;
the parabola drawing unit is used for drawing parabolas for the base station cells within the range of the layer circle and eliminating the base station cells within the parabolas so as to avoid cell interference;
and the circle relation generating unit is used for calculating the regional attribute of the rest cells after removing the base station cells which do not meet the requirements, and calculating the forward cell or the backward cell.
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