US 12,309,723 B2
System and method for device-to-device synchronization
Philippe Sartori, Plainfield, IL (US); Deping Liu, Schaumburg, IL (US); Brian Classon, Palatine (CN); and Qiang Li, Beijing (CN)
Assigned to FUTUREWEI TECHNOLOGIES, INC., Plano, TX (US)
Filed by Futurewei Technologies, Inc., Plano, TX (US)
Filed on May 9, 2022, as Appl. No. 17/739,631.
Application 17/739,631 is a continuation of application No. 16/716,140, filed on Dec. 16, 2019, granted, now 11,330,542.
Application 16/716,140 is a continuation of application No. 14/530,269, filed on Oct. 31, 2014, granted, now 10,560,908, issued on Feb. 11, 2020.
Claims priority of provisional application 61/898,194, filed on Oct. 31, 2013.
Prior Publication US 2022/0338138 A1, Oct. 20, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. H04W 72/04 (2023.01); H04W 56/00 (2009.01); H04W 8/00 (2009.01); H04W 76/14 (2018.01)
CPC H04W 56/001 (2013.01) [H04W 56/002 (2013.01); H04W 8/005 (2013.01); H04W 76/14 (2018.02)] 18 Claims
OG exemplary drawing
 
1. A method comprising:
receiving, by a user equipment (UE) from a base station serving the UE, a radio resource control (RRC) signaling, the RRC signaling identifying a synchronization resource for transmitting a device-to-device synchronization signal (D2DSS) by the UE; and
transmitting, by the UE, the D2DSS over the synchronization resource in accordance to one of:
determining that a reference signal received power (RSRP) measurement of reference signals received from the base station is lower than a threshold, wherein the RRC signaling further indicates the threshold, or
receiving another RRC signaling instructing the UE to transmit the D2DSS, wherein the RRC signaling is before the another RRC signaling.