US 10,342,056 B2
Method and device whereby device-to-device terminal transmits discovery signal in wireless communication system
Hyukjin Chae, Seoul (KR)
Assigned to LG ELECTRONICS INC., Seoul (KR)
Appl. No. 15/513,766
Filed by LG ELECTRONICS INC., Seoul (KR)
PCT Filed Sep. 23, 2015, PCT No. PCT/KR2015/010021
§ 371(c)(1), (2) Date Mar. 23, 2017,
PCT Pub. No. WO2016/048037, PCT Pub. Date Mar. 31, 2016.
Claims priority of provisional application 62/053,827, filed on Sep. 23, 2014.
Prior Publication US 2017/0295603 A1, Oct. 12, 2017
Int. Cl. H04L 5/00 (2006.01); H04W 8/00 (2009.01); H04W 72/04 (2009.01); H04W 76/14 (2018.01)
CPC H04W 76/14 (2018.02) [H04W 72/0406 (2013.01); H04L 5/003 (2013.01); H04L 5/0053 (2013.01); H04W 8/005 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A method of transmitting a discovery signal by a device-to-device (D2D) user equipment (UE) in a wireless communication system, the method comprising:
determining a size of a sub-period, by the D2D UE, based on a buffer size of a D2D UE receiving the discovery signal in a discovery period; and
transmitting the discovery signal for each of a plurality of sub-periods related with the determined size,
wherein the discovery period is divided into the plurality of the plurality of sub-periods,
wherein the size of the sub-period is determined to minimize the number of subframes not contained in any sub-period in the discovery period, and
wherein the size of the sub-period is determined as follows:

OG Complex Work Unit Drawing
wherein Nbuffer corresponds to the number of subframes stored in the buffer, wherein M corresponds to a size of a sub-period, wherein M′ corresponds to a size of the determined sub-period, wherein m corresponds to the number of repetition of the discovery signal, and wherein NP corresponds to the number of subframes contained in a discovery period.