Mobile communication system for accomplishing handover with phase difference of frame sync signals corrected
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United States of America Patent
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-
Jul 10, 2001
Grant Date -
N/A
app pub date -
Oct 22, 1997
filing date -
Nov 28, 1996
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A method of switching a communication channel when a mobile station moves from one service area to another service area is disclosed. The mobile station determines a difference between the transmission phase of a frame synchronizing signal received from a first base station currently holding a communication channel with the mobile station and the transmission phase of a frame synchronizing signal received from a second base station expected to newly set up a communication channel with the mobile station. The mobile station sends phase difference information representative of the above difference to the first base station via the communication channel. The first base station having received the phase difference information transfers the information to the second base station, causing it to correct the phase of data thereof to be sent to the mobile station. This successfully implements soft handover while guaranteeing the phase synchronization of frames sent from the two base stations.
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