Method and apparatus for efficient candidate frequency search while initiating a handoff in a code division multiple access communication system
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United States of America Patent
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Jul 22, 2003
Grant Date -
N/A
app pub date -
May 14, 1999
filing date -
May 14, 1999
priority date (Note) -
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Abstract
A method and apparatus for efficient candidate frequency search while initiating a handoff in a code division multiple access communication system. The method includes when the pilot signal is transmitted by the mobile station that is power controlled to a target receive level, the traffic channel power level is increased relative to the pilot channel to improve receiver performance. An improved feature is that the received pilot received at the base station stays the same while the receiver receives extra energy in the redundant traffic symbols received to enhance the probability of correctly decoding the received frame. The base station detects the absence of the mobile station transmitted signal from the frequency of interest. If the base station is aware of the starting time and duration of the absence, it can focus its detection during this predetermined time period. The performance can be improved if the absence of the signal is spread across two frames at the frame boundary.
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