Mobile station handoff between different CDMA frequencies
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United States of America Patent
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Oct 1, 2002
Issued Date -
N/A
app pub date -
Dec 15, 1999
filing date -
Aug 21, 1997
priority date (Note) -
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Abstract
A method and system for mobile assisted handoff between base stations using different carrier frequencies in a Code Division Multiple Access (CDMA) cellular system. In the method and apparatus, a mobile station performs handoff measurements on forward link transmissions of handoff candidate CDMA base stations, where the forward link transmissions are transmitted on a carrier frequency that differs from the forward link carrier frequency of the current base station. The handoff measurements are performed during selected transmission frames that define transmission periods on the reverse link by the mobile station. During the measurement time in the selected transmission frame, the mobile station does not receive (punctures) data sent to it on the forward link and does not transmit data on the reverse link.
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