US 12,069,006 B2
Systems and methods for time division duplex (TDD) synchronizing in distributed communication systems (DCSs)
Yona Henia, Mazkeret Batia (IL); Guy Horwitz, Ness Ziona (IL); and Gila Shmueli, Mazkeret Batya (IL)
Assigned to CORNING RESEARCH & DEVELOPMENT CORPORATION, Corning, NY (US)
Filed by Corning Research & Development Corporation, Corning, NY (US)
Filed on Jun. 18, 2021, as Appl. No. 17/351,572.
Prior Publication US 2022/0407670 A1, Dec. 22, 2022
Int. Cl. H04L 5/14 (2006.01); H04L 7/00 (2006.01)
CPC H04L 5/14 (2013.01) [H04L 7/0016 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A head end configured for use in a distributed communication system, the head end comprising:
a first time division duplex (TDD) radio interface module (RIM) configured to synchronize based on a downlink signal;
a second TDD RIM;
a summation circuit having a port coupled thereto, the port configured to couple to a remote unit through an optical fiber;
a first switch coupling the first TDD RIM to the summation circuit;
a second switch coupling the second TDD RIM to the summation circuit; and
a control circuit configured to:
while in a synchronization state:
close the first switch to couple the first TDD RIM to the summation circuit; and
open the second switch to disconnect the second TDD RIM from the summation circuit; and
after determining that synchronization is complete:
close the second switch to connect the second TDD RIM to the summation circuit; and
open the first switch to disconnect the first TDD RIM from the summation circuit.