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Cell Splitting and Sectoring

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Agnidhra Ghosh

on 13 April 2015

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Transcript of Cell Splitting and Sectoring

Frequency reuse is the process of using the same radio frequencies on radio transmitter sites within a geographic area that are separated by sufficient distance to cause minimal interference with each other. Frequency reuse allows for a dramatic increase in the number of customers that can be served (capacity) within a geographic area on a limited amount of radio spectrum (limited number of radio channels).
The maximum data rate that can be attained over a given channel is known as channel capacity. C= M*K*N
Where
C is channel capacity
M is number of clusters.
K is the allotted channels to a cell
N is the number of cells in a cluster

As the number of users in the system increases the channel capacity consequently decreases. By using methods such as Cell Splitting or Cell Sectoring, the capacity is increased.
Cell Splitting
Cell splitting is done in case of congested cells. In such a congested cell, we divide it into smaller cells, which are covered by their own base stations, with a reduction in antenna height.
Cell sectoring leads to increased capacity.
Mobile Communication
Cell Sectoring and Splitting
A discussion on the basics of Mobile Communication and the effects of Cell Sectoring and Splitting upon it
Cell Splitting Difficulties
Requirement for Cell Splitting and Sectoring
Channel Capacity
Frequency Reuse
Cell Splitting using Umbrella Approach
Cell Splitting and Sectoring
Cell
In wireless telephony, a cell is the geographical area covered by a cellular telephone transmitter.
Cell Shape
The cell shape is generally chosen to be hexagonal, as it avoids the overlap that occurs in case of circular shape, and unlike in square shaped cells, the distance of the edges from the center are almost equal.
There are some limitations involved in cell splitting. These include :
> More Frequent Handoffs
> Difficult to execute channel assignments
> All the cells are not split simultanetously
The Umbrella approach saves one from building multiple base stations. In the Umbrella approach, the single base tower serves all the split cells via antennas on it at different heights.
Cell Sectoring
It basically involves replacing an omni directional antenna at the base station by several directional antennas. Cell sectoring is done mainly to reduce factors such as co-channel interference.
It offers the following advantages:
> Better S/I ratio
> Reduces interference, increases capacity
> Reduces cluster size, more freedom in assigning channels
Advantages of Cell Sectoring
> Increased number of antennas per base station
> Decrease in trunk efficiency
> Loss of traffic
> Increased number of handoffs
Limitations of Cell Sectoring
Full transcript