CPC H04W 72/0446 (2013.01) [H04B 1/48 (2013.01); H04L 5/14 (2013.01); H04W 72/20 (2023.01); H04B 17/318 (2015.01)] | 20 Claims |
1. A control circuit for controlling switching between a time-division duplexing (TDD) transmit mode and a TDD receive mode in a wireless communications system supporting TDD, the control circuit comprising:
a first power detector configured to determine a first power level in a downlink direction on a downlink optical path;
a second power detector configured to determine a second power level in an uplink direction on an uplink optical path;
a receive/transmit comparator coupled to the first power detector and to the second power detector, wherein the receive/transmit comparator compares the first power level to the second power level to provide a first indication that the system should be switched to TDD transmit mode when the first power level exceeds the second power level;
a second power comparator configured to determine a second indication indicative of whether the first power level exceeds a value of a transmit power reference; and
a logic circuit configured to determine if the system should be switched to TDD transmit mode or TDD receive mode based at least in part on a received first indication from the receive/transmit comparator and a received second indication from the second power comparator, wherein
the logic circuit has a first state in which the second power level exceeds the first power level to indicate TDD receive mode, and
the logic circuit has a second state in which the first power level exceeds the second power level.
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