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Method of a forward power control using an erasure indicator bit
| Details |
Inventors: Kim, Wan-Ho;
Assignee: Samsung Electronics Co., Ltd. (KR)
Primary Examiner: Bost; Dwayne D.
Assistant Examiner: Craver; Charles
Attorney, Agent or Firm: Dilworth & Barrese, LLP.
A method for performing forward power control in a code division multiple access (CDMA) cellular communication system includes initializing and starting the forward power control. Additionally, a forward link transmission gain of a power transmitted from a base station to a mobile station is adjusted based on a value of an erasure indicator bit contained in a reverse traffic frame transmitted in a reverse traffic channel from the mobile station. |
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DETAILED DESCRIPTION It is therefore an object of the present invention to provide forward power control which judges the forward link quality based on an erasure indicator bit contained in a reverse traffic channel frame transmitted from a mobile station.
In one aspect of the invention, a method for performing forward power control in a code division multiple access (CDMA) cellular communication system comprises the steps of: initializing and starting the forward power control; and adjusting a forward link transmission gain of a power transmitted from a base station to a mobile station based on a value of an erasure indicator bit contained in a reverse traffic frame transmitted in a reverse traffic channel from the mobile station.
Preferably, the forward power control is performed by a transceiver selector bank in a base station transceiver subsystem.
The forward gain is reduced when the erasure indicator bit equals 0, or is increased when the erasure indicator bit equals 1.
The erasure indicator bit is set equal to 0 when the quality of a forward traffic channel is greater than a predefined threshold, or set to 1 when the quality of the forward traffic channel is less than the predefined threshold.
The forward gain is preferably reduced repeatedly by a specified value over a specified time interval, when the erasure indicator bit is equal to 0.
However, the forward gain is not further reduced, when the forward gain becomes equal to a predefined minimum forward link transmission gain.
Additionally, the forward gain is increased by a first specified value, when the erasure indicator bit is equal to 1 and the forward gain at the present time is less than a nominal forward link transmission gain.
The forward gain is increased by a second specified value, when the erasure indicator bit is equal to 1 and the forward gain at the present time is greater than a nominal forward link transmission gain.
These and other objects, features and advantages of the present invention will become apparent from the following detailed description of illustrative embodiments thereof, which is to be read in connection with the accompanying drawings, where the same reference numerals are used to represent the same functional elements
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Cell Phones 
