US Patent No. 9,661,586

POWER CONTROL METHOD AND DEVICE FOR DEVICE TO DEVICE (D2D) TRANSMISSION


Patent No. 9,661,586
Issue Date May 23, 2017
Title Power Control Method And Device For Device To Device (d2d) Transmission
Inventorship Qiubin Gao, Beijing (CN)
Rui Zhao, Beijing (CN)
Wenhong Chen, Beijing (CN)
Ying Peng, Beijing (CN)
Assignee CHINA ACADEMY OF TELECOMMUNICATIONS TECHNOLOGY, Beijing (CN)

Claim of US Patent No. 9,661,586

1. A method for controlling power in Device to Device (D2D) transmission, the method comprising:
determining, by an base station (BS), an interference power upper limit for a UE, which is the highest interference level,
allowed by the BS, caused by D2D transmission to cellular transmission; and

sending, by the BS, the interference power upper limit to the UE so that the UE determines a D2D transmission power upper
limit from the interference power upper limit;

wherein the D2D transmission power upper limit is determined by the UE in the equation of:
PLM,D2D(i)=A+PO_Interf_UL+?┬ĚPL;

wherein PLM,D2D(i) represents a D2D transmission power upper limit in the i-th sub-frame; PO_Interf_UL represents the interference power upper limit; ? represents a compensation factor, and 0???1; PL represents the path loss
from the UE to the BS; and A=0 or A=10 log10(MD2D(i)), where MD2D(i) represents a bandwidth of D2D transmission in the i-th sub-frame.