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لماذا شكل منطقة التغطية ( الخلية ) في شبكة GSM لها شكل سداسي ؟ لماذا لا يقولون أنه دائري أو مربع أو خماسي ؟
The original shape of any cell is circle, but these circles when arranged in a way the coverage boundaries between them form a certain shape.
Actually some other arrangements and shapes are used, for example, square cells in New York. However, the hexagon arrangement of the base stations provides best and most efficient use of the base stations.
Der Sir:
Thank you for your question
The hexagon shape in cellular communication planning and design of mobile networks is the most suitable shape for many reasons, most important of them the following:
- The hexagon is used because it best represent and simulates the seven tower over lapping of circle. Circle being the way radio frequency are depicted.
- The hexagon was chosen as it comes the closest to the circle, and the hexagon layout requires fewer cells (when compared to triangles rectangles)
- The radius of a hexagon is defined to be the radius of the circle that circumscribes it.
- Provide equidistant antenna.
Best regard
in the engineering language earth is divided into cell every cell have own bts the shape of cell is because that are covered all the area that is main reason of hexagon shape
well its so sample , it just provide us with the minimum interferance
Because,1)It has the most sides that can fit together without gaps.
2)The frequecncy reuse become possible using this shape.
3) The radiation pattern of the antennas used is60 degree which means6 are required for the full360 degrees coverage which is the same no. of sides the hexagon consists.
4) Frequency are emitted in circular way which makes the square, rectangle or a triangle unsuitable shapes for the cell while if we use a circular shape for the cell there will be gaps between cells.
In7 cell resuse the frequency band is divided into7 segments and each cell uses one segment. Geographically, each cell is surrounded by6 cells using a different frequency band. This is called a cluster. The simplest option is to have a hexagonal cell shape so that the cells do not overlap each other and there are no zones without coverage. Hexagonal cells fit perfectly.
In reality the a cell's coverage area is neither hexagonal nor circular. It is determined by the construction in that area as well as foliage. If you look at the coverage area of a cell as determined by a Network Planning tool you would see that its amoeba like. There would be areas where two cells having the same frequency might be interfering with each other as well as some dead zones.