Patent ID: 11202320

Abstract:
A communication method and system for converging a fifth generation (5G) communication system for supporting higher data rates beyond a fourth generation (4G) system with a technology for Internet of things (IoT) are provided. The communication method and system 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. A method by a terminal for performing a random access (RA) procedure is provided. The method comprises transmitting a first RA preamble to a base station, initiating to monitor a first RA response (RAR) as a response to the first RA preamble in an RAR window, and based on the terminal failing to receive the first RAR in until end of a retransmission time, transmitting a second RA preamble to the base station.