US 11,792,776 B2
Time-division duplexing (TDD) in distributed communications systems, including distributed antenna systems (DASs)
Dror Ben-Shlomo, Modiin Makabim Reut (IL); and Isaac Shapira, Petach Tikva (IL)
Assigned to Corning Optical Communications LLC, Charlotte, NC (US)
Filed by Corning Optical Communications LLC, Charlotte, NC (US)
Filed on Mar. 10, 2022, as Appl. No. 17/691,900.
Application 17/691,900 is a continuation of application No. 16/842,314, filed on Apr. 7, 2020, granted, now 11,291,001.
Application 16/842,314 is a continuation of application No. 16/374,389, filed on Apr. 3, 2019, granted, now 10,694,519, issued on Jun. 23, 2020.
Application 16/374,389 is a continuation of application No. 15/975,153, filed on May 9, 2018, granted, now 10,257,828, issued on Apr. 9, 2019.
Application 15/975,153 is a continuation of application No. 14/962,338, filed on Dec. 8, 2015, granted, now 9,974,074, issued on May 15, 2018.
Application 14/962,338 is a continuation of application No. PCT/IL2014/050526, filed on Jun. 11, 2014.
Claims priority of provisional application 61/834,075, filed on Jun. 12, 2013.
Prior Publication US 2022/0201683 A1, Jun. 23, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. H04W 72/0446 (2023.01); H04B 1/48 (2006.01); H04W 72/20 (2023.01); H04L 5/14 (2006.01); H04B 17/318 (2015.01)
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
OG exemplary drawing
 
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.