| CPC H04B 7/0695 (2013.01) [H04B 7/0632 (2013.01)] | 13 Claims |
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1. A method of a user equipment (UE) for selecting a beam in an initial access mode of a wireless communication system, the method comprising:
determining a first receive beam parameter including information for a number of receive antennas activated for first beam searching;
receiving, from a base station (BS), a first transmit beam parameter including information for a number of transmit antennas activated for the first beam searching;
receiving a first reference signal (RS) based on the first transmit beam parameter while changing receive beams based on the first receive beam parameter;
selecting, based on the received first RS, a transmit beam and a receive beam for data communication;
determining, based on reference signal receive power (RSRP) of the received first RS, the selecting operation of the transmit beam and the receive beam for the data communication as:
a first mode in which additional beam searching is performed; or
a second mode in which additional beam searching is not performed; and
transmitting, to the BS, information for the selected transmit beam,
wherein the selecting operation of the transmit beam and the receive beam determined as the first mode comprises:
determining a second receive beam parameter including information for a number of receive antennas activated for second beam searching;
receiving, from the BS, a second transmit beam parameter including information for a number of transmit antennas activated for the second beam searching;
receiving, based on the second transmit beam parameter, a second RS identified while changing receive beams based on the second receive beam parameter; and
selecting, based on the received second RS, the transmit beam and the receive beam for the data communication.
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