Saturday, November 13, 2010

Explain the concept of Cell Breathing. How is the accounted for in the link Budget?

Explain the concept of Cell Breathing. How is the accounted for in the link Budget?

 

Ans: Io or No (the interference part of Ec/Io and Eb/No) increase as the traffic on the network increases since everyone is using the same frequency. Therefore as Io or No increases the UE or BTS needs to use more power to maintain the same Eb/No or Ec/Io. When the power required is more than the maximum power allowed, the connection cannot be made. Users at the cell edge are usually the first to lose service, hence the service area of a cell shrinks. As traffic decreases the reverse happens and the service area increases. They should say that it is accounted for in the Noise Rise Margin found in the Link Budget.

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