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GPRS : General Packet Radio System - page 17 / 20

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Networks: L17

17

Fast Power Control

regulates the transmit power of mobile and of base station

the lower the power the less the interference

»

less interference means more capacity on the same CDMA carrier

aim for the base station to receive the same power level from all handsets in the cell, regardless of distance from the base station

»

if power level from one handset higher than needed, everyone else will suffer

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if power too low, quality will suffer

WCDMA updates power levels 1500 times per second

»

rapid changes in the radio environment can be handled

implemented in both uplink and downlink

cell breathing occurs :

»

size of a cell varies depending on the traffic load

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when load is low, good quality achieved over long distance

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when load is high, interference is higher and users need to   be closer to the base station to get the same quality

High Load

Low Load

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