Multiplex communications – Communication over free space – Having a plurality of contiguous regions served by...
Reexamination Certificate
2008-01-15
2008-01-15
Hsu, Alpus H. (Department: 2616)
Multiplex communications
Communication over free space
Having a plurality of contiguous regions served by...
C370S350000, C370S508000, C370S514000, C375S356000, C375S365000, C455S067160, C455S502000
Reexamination Certificate
active
09272193
ABSTRACT:
A method of timing in a multi-cell system requiring synchronization of frames in transmission is provided. Transceivers of a wired data interface between a central controller and multiple base stations are synchronized to a frame timing clock up to a difference in propagation delays between the central controller and multiple base stations. The propagation delays are considered as constants, are measured, and are stored in each base station. A unique word is regularly inserted in the data transmitted by the central controller, at a fixed interval. When this unique word is detected by the base station within a fixed period of the frame timing clock, a frame signal delay is initiated at the next rising edge of each frame timing clock. This frame signal delay is equal to the period of the frame timing clock minus the propagation delay. At the end of the frame delay, the frame data is transmitted, and all frames are simultaneously transmitted from different base stations.
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Ho Jul-Kuang
Lu Chun Chian
Wann Chin-Der
Finnegan Henderson Farabow Garrett & Dunner LLP
Hsu Alpus H.
Industrial Technology Research Institute
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