Mobile station assisted timing synchronization in a CDMA communication system
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United States of America Patent
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May 22, 2012
Grant Date -
Nov 20, 2008
app pub date -
Nov 13, 2007
filing date -
Sep 19, 1997
priority date (Note) -
In Force
status (Latency Note)
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Abstract
In the present invention, the slave base station attains synchronization with the reference base station through messages transmitted from and received by a mobile station either in the soft handoff region between the reference base station and the slave base station or within a range which allows the mobile station to communicate with the slave base station. When the mobile station is not in communication with both the reference base station and the slave base station, then the round trip delay between the mobile station and the reference base station is measured by the reference base station. The reference base station communicates the PN code used by the mobile station over the reverse link to the slave base station. The slave base station acquires the signal from the mobile station and determines when the signal from the mobile station arrives. The slave base station then makes an estimate as to the length of the delay between transmission of a signal from the mobile station to the slave base station. Based upon these measurements and estimates, the slave base station determines the error which is present in the slave base station system time.
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