Tailored power levels at handoff and call setup
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United States of America Patent
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-
Nov 25, 2003
Grant Date -
N/A
app pub date -
Dec 23, 1999
filing date -
Apr 27, 1999
priority date (Note) -
In Force
status (Latency Note)
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Abstract
Methods and apparatus for controlling the initial transmit power from a base station to a mobile station at call set-up and call handoff. The initial transmit power from a base station during a call set-up can be reduced from the conventional full power level by a sum of the hysteresis value for the cell which is handing off the mobile station and the hysteresis value for the cell which is receiving the mobile station. When a mobile station initiates or receives a call, the initial transmit power from a base station to the mobile station is reduced from the full power level by the hysteresis value for the hysteresis zone which surrounds the cell in which call set-up is to occur. The reduction in the initial power levels reduces interference caused to surrounding cells at the initiation of a call set-up or call handoff.
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