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1. (WO2018128284) METHOD FOR RANDOM ACCESS, USER EQUIPMENT AND BASE STATION

Pub. No.:    WO/2018/128284    International Application No.:    PCT/KR2017/014310
Publication Date: Fri Jul 13 01:59:59 CEST 2018 International Filing Date: Fri Dec 08 00:59:59 CET 2017
IPC: H04W 74/08
H04W 74/00
H04W 52/36
H04W 52/42
Applicants: SAMSUNG ELECTRONICS CO., LTD.
Inventors: ZHANG, Yingjie
YU, Bin
QIAN, Chen
SU, Di
XIONG, Qi
FU, Jingxing
Title: METHOD FOR RANDOM ACCESS, USER EQUIPMENT AND BASE STATION
Abstract:
The present disclosure relates to a communication method and system for converging a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4th-Generation (4G) system with a technology for Internet of Things (IoT). The present disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. Embodiments of the present invention provide a method for RACH re-attempt, a user equipment and a base station. The method comprises the steps of: by a base station, determining system configuration information and transmitting the system configuration information to a user equipment; and then, by the user equipment, transmitting a preamble sequence to perform random access, and if the random access is failed, performing RACH attempt according to the received RACH re-attempt configuration information to perform random access until a preset decision condition is satisfied. The embodiment of the present invention is used for RACH re-attempt when random access fails.