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Method-and-system-for-controlling-forward-transmit-power-in-a-wireless-system

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Method and system for controlling forward transmit power in a wireless system

Details

Inventors: Kamel, Raafat Edward; Kuo, Wen-Yi; Meyers, Martin Howard; Weaver, Carl Francis; Wu, Xiao Cheng;
Assignee: Lucent Technologies Inc. (Murray Hill, NJ)
Primary Examiner: Pham; Chi
Assistant Examiner: Bayard; Emmanuel
Attorney, Agent or Firm: Harness, Dickey & Pierce, P.L.C.

A method and system for controlling down link transmit power during a soft hand-off in a spread-spectrum wireless system supports independent power control of multiple forward channels to reduce fading. For a soft hand-off, a mobile switching center determines if a forward control channel is transmitted from different sectors of base stations than a forward data channel is. The base stations preferably adjust transmit powers of the forward channels grouped into different physical channels by receiving power control data over the allocated reverse power control channels to compensate for fading of the forward channels during a soft hand-off.

DETAILED DESCRIPTION In accordance with one aspect of the invention, a method and system for controlling down link transmit power during a soft hand-off in a spread-spectrum wireless system supports independent power control of multiple forward channels to reduce fading.
For a soft hand-off, a wireless system or a part thereof determines if a forward control channel is transmitted from different set of sectors of base stations than a forward data channel.
For example, the mobile switching center determines if active control sectors are different in number or identity from at least one active data sector participating in the soft hand-off.
Each sector is preferably represented by a distingishable pilot code of a pilot channel.
If the forward control channel is transmitted from different sectors than the forward data channel, multiple reverse power control channels are allocated.
The base stations adjust transmit powers of the forward channels grouped into different physical channels by receiving power control data over the allocated reverse power control channels to compensate for fading of the forward channels during a soft hand-off.
In one embodiment of the invention, a distinct power control channel is associated with each forward data channel that is transmitted from a different set of sectors than any other channels associated the base stations participating in the soft hand-off.

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