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An umbrella cell covers several microcells. The power level inside an umbrella cell is increased ... The GSM system is the first digital cellular system.

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Posted by waqasahmad

For high traffic & also improvements in handoff

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Posted by Hash007

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Posted by HamidAliKhan

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Posted by HamidAliKhan

The umbrella approach is used to solve the problems of large number of calls in specific are.
such as in BAZAR's.

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Posted by waqqas1

Umbrella cells:
A terminal crossing very small cells produces increased number of handoffs among different small neighboring cells. To solve this problem, the concept of umbrella-cell is introduced. An umbrella cell covers several microcells. The power level inside an umbrella cell is increased comparing to power levels used in microcells that form the umbrella cell. When the speed ofthe mobile is too high, the mobile is handed off to the umbrella cell. The mobile will then stay longer in the same cell (in this case the umbrella cell). This will reduce the number of handoffs and the work of the network.

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Posted by sagitraz