US 10,893,542 B2
Random access method in BDMA system and random access method in pattern/polarized BDMA system
Dong Ho Cho, Daejeon (KR); Byung Chang Chung, Daejeon (KR); Dae Hee Park, Daejeon (KR); Joon Sang Han, Daejeon (KR); and Yun Sik Kim, Daejeon (KR)
Assigned to KOREA ADVANCED INSTITUTE OF SCIENCE AND TECHNOLOGY, Daejeon (KR)
Appl. No. 16/78,229
Filed by KOREA ADVANCED INSTITUTE OF SCIENCE AND TECHNOLOGY, Daejeon (KR)
PCT Filed Feb. 22, 2016, PCT No. PCT/KR2016/001697
§ 371(c)(1), (2) Date Aug. 21, 2018,
PCT Pub. No. WO2017/146274, PCT Pub. Date Aug. 31, 2017.
Prior Publication US 2019/0053286 A1, Feb. 14, 2019
Int. Cl. H04B 7/04 (2017.01); H04B 7/0408 (2017.01); H04W 74/08 (2009.01); H04B 7/06 (2006.01); H04W 4/029 (2018.01)
CPC H04W 74/0833 (2013.01) [H04B 7/04 (2013.01); H04B 7/0408 (2013.01); H04B 7/06 (2013.01); H04B 7/063 (2013.01); H04B 7/0617 (2013.01); H04B 7/0695 (2013.01); H04W 4/029 (2018.02)] 16 Claims
OG exemplary drawing
 
1. A random access method in a beam division multiple access (BDMA) system comprising the steps of:
receiving, by a terminal, a reference signal of at least one beam sector transmitted from an access point (AP) device;
estimating, by the terminal, whether the terminal is in a center area of the beam sector provided by the AP device or in a boundary area of the beam sector based on a strength of the reference signal;
transmitting, by the terminal, a different preamble to the AP device in accordance with location information of whether the terminal is located in the center area or in the boundary area; and
determining, by the AP device, a target beam sector for transmitting information about uplink resources to be used by the terminal, among a plurality of beam sectors on the basis of the received preamble,
wherein when the terminal estimates that the terminal is in the center area, the terminal transmits a preamble in a first preamble set to the AP device and when the terminal estimates that the terminal is in the boundary area, the terminal transmits a preamble in a second preamble set to the AP device.