US Patent No. 10,893,542

RANDOM ACCESS METHOD IN BDMA SYSTEM AND RANDOM ACCESS METHOD IN PATTERN/POLARIZED BDMA SYSTEM


Patent No. 10,893,542
Issue Date January 12, 2021
Title Random Access Method In Bdma System And Random Access Method In Pattern/polarized Bdma System
Inventorship Dong Ho Cho, Daejeon (KR)
Byung Chang Chung, Daejeon (KR)
Dae Hee Park, Daejeon (KR)
Joon Sang Han, Daejeon (KR)
Yun Sik Kim, Daejeon (KR)
Assignee KOREA ADVANCED INSTITUTE OF SCIENCE AND TECHNOLOGY, Daejeon (KR)

Claim of US Patent No. 10,893,542

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.