Radio base station with multiple radio frequency heads
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United States of America Patent
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Jun 15, 2010
Grant Date -
Jul 14, 2005
app pub date -
Dec 15, 2004
filing date -
Jan 8, 2004
priority date (Note) -
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Abstract
A radio base station has a baseband unit (BB) and multiple RF heads (RH1, RH2), which are interconnected by means of a bi-directional two-fiber optical ring (R). Each RF head (RH1, RH2) has a delay counter (31) for determining a propagation delay (tL) on the ring (R) and a variable delay circuit (16, 26) for compensating a difference between the propagation delay on the ring and a predefined target delay (tRR). The delay counter counts (31) the delay between a test signal sent on the first fiber (F1) of the ring to the baseband unit and a received test signal looped back by the baseband unit on the second fiber (F2) of the ring.
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