## Related to mobile comm.

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Mobile
Mobile communication
Can anyone tell me why hexagonal unit cells are used in mobile communication.

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• The idea to use any shape for mobile communication basically came from the need to divide an area of land into some regular shape in order to pass on mobile communication signals. The need was to have such cell shapes that would 1. Completely cover the land 2. No overlapping – as that may cause interference in signals 3. No gaps – as that may cause the signals to drop. 4. Lastly- Maximum area coverage in one cell. Square, triangle, circle and hexagon – all qualify as regular shapes. Circle gives the maximum area coverage but there could be gaps or overlapping. Squares, equilateral triangles and hexagons are perfect for covering without gaps or overlaps. However, compared to a circle of same dimensions (diameter of inscribed circles of each shape, kept same as the diameter of the circle), the next best coverage are as follows: The area of a hexagon to a circle approx = 83% The area of a square to a circle approx = 63.7% The area of an equilateral triangle to a circle approx = 17.77% Thus, Hexagon is the shape that meets most of the requirements and hence the best choice for mobile communication. Hope that helps.
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• The cell towers are arranged as much as possible in a hexagonal pattern. Each tower has circular coverage. By arranging the towers on hexagonal points, overlap can happen with six other towers going in each of six directions. The overlap is required for orderly handoff from tower to tower as you travel (in any direction). . The simple geometry of the hexagonal pattern gives the most coverage with fewest towers. . Tom
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