公开(公告)号：US10548168B2

公开(公告)日：2020-01-28

申请号：US15828328

申请日：2017-11-30

Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE

Inventor： Ji Soo Park ,  Kyung Yeol Sohn ,  Hoon Lee

IPC: H04W72/04 ,  H04W74/08 ,  H04W92/20

Abstract: Disclosed are a random access method and a random access apparatus in a wireless communication system. An operation method of a terminal in a communication system, according to the present invention, comprises receiving system information including configuration information on a physical random access channel (PRACH) composed of a plurality of access slots from a first base station; selecting one access slot among the plurality of access slots based on the configuration information; and transmitting a random access preamble to the first base station through the one access slot. Therefore, the capacity of the random access channel can be increased without further occupation of radio resources.

公开(公告)号：US09653911B1

公开(公告)日：2017-05-16

申请号：US15168417

申请日：2016-05-31

Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE

Inventor： Uijung Kim ,  Kyung-Hoon Lee ,  Sung-Hyun Kim ,  Hoon Lee ,  Ki-Baek Kim ,  Dong-Min Kim ,  Sang-Kyu Kim ,  Saehoon Ju

IPC: H05B37/00 ,  H05B41/00 ,  H02H9/00

CPC classification number: H04B10/802

Abstract: A broadband surge suppression module having an optical coupling channel includes a surge protection circuit unit for eliminating or limiting a surge signal from an input digital signal, a light-emitting circuit unit for receiving an output signal of the surge protection circuit unit, converting the output signal into an optical signal, and transmitting the optical signal, a light-receiving circuit unit for receiving the optical signal from the light-emitting circuit unit, a signal restoration circuit unit for restoring a digital signal from an output signal of the light-receiving circuit unit, and a module casing unit for allowing the surge protection circuit unit, the light-emitting circuit unit, the light-receiving circuit unit, and the signal restoration circuit unit to be located therein, the module casing unit being formed to penetrate through an electromagnetic shielding wall for protecting a control system.

公开(公告)号：US20140003416A1

公开(公告)日：2014-01-02

申请号：US13841232

申请日：2013-03-15

Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE

Inventor： Jun-Woo Kim ,  Hyeong Sook Park ,  Hoon Lee ,  Seungjae Bahng ,  Youn Ok Park

IPC: H04W56/00

CPC classification number: H04W56/001 ,  H04W48/20 ,  H04W56/00 ,  H04W56/005

Abstract: There is provided a method for acquiring and modifying uplink and downlink synchronization, by which, if there is a possibility of ISI occurring due to incorrect downlink synchronization of a terminal with a base station, the terminal receives a ranging response from the base station, modifies incorrect downlink synchronization, and acquires uplink synchronization in accordance with modified downlink synchronization. The method for acquiring and modifying uplink and downlink synchronization efficiently prevents, in a cooperative communication network, discrepancy in signal transmission synchronization between the base stations, excessive attenuation of a transmitted signal, or a delay caused by a difference in reflection paths.

Abstract translation: 提供了一种用于获取和修改上行链路和下行链路同步的方法，通过该方法，如果由于具有基站的终端的下行链路同步不正确而发生ISI的可能性，则终端从基站接收测距响应，修改 不正确的下行链路同步，并根据修改的下行链路同步获取上行链路同步。 用于获取和修改上行链路和下行链路同步的方法在协作通信网络中有效地防止了基站之间的信号传输同步的差异，发射信号的过度衰减或由反射路径的差异引起的延迟。