Synchronization in TDMA systems in a non-realtime fashion
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United States of America Patent
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Feb 16, 1999
Grant Date -
N/A
app pub date -
Sep 30, 1996
filing date -
Sep 30, 1996
priority date (Note) -
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status (Latency Note)
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Abstract
A method and apparatus for synchronization between a base station sub-system and a mobile station. The mobile station listens for a message frame number which is generated by the base station sub-system. The mobile station includes a mobile frame number counter which tracks the progression of frame numbers. When first powered-up, the mobile frame number counter may not be synchronized with the base station sub-system. The frame numbers of the base station sub-system and mobile frame number counter values are continuously incremented to track the progression of frame numbers in real-time. To effect synchronization, a received and decoded frame number is loaded into the counter. Then, a time lag is calculated which represents the delay inherent in receiving and decoding, within the mobile station and its components, frame numbers from the base-station sub-system. The time lag is then added to the mobile frame number counter of the mobile station so that the mobile frame number counter is synchronized with the base station sub-system.
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