Random access technique in mobile communication system using beamforming

A user equipment (UE) for performing random access, the UE comprising:

• a controller configured to:
• determine a number of reception beams of a base station (BS) connected to transmission beams of the UE, and
• determine radio transmission resources used for a random access for each of the reception beams;
• and
• a transceiver configured to attempt the random access in the determined radio transmission resources through the reception beams,
• wherein a number of the radio transmission resources used for the random access for each of the reception beams is determined by dividing a total number of random access resources of the UE by the number of the reception beams.

A method of supporting random access by a base station (BS), the method comprising:

• determining a number of reception beams of the BS connected to transmission beams of a user equipment (UE);
• determining radio transmission resources used for a random access for each of the reception beams;
• and
• receiving a random access message in the determined radio transmission resources through reception beams,
• wherein a number of the radio transmission resources used for the random access for each of the reception beams is determined by dividing a total number of random access resources of the UE by the number of the reception beams.

A base station (BS) supporting random access of a user equipment (UE), the BS comprising:

• a controller configured to:
• determine a number of reception beams connected to transmission beams of the UE, and
• determine radio transmission resources used for a random access for each of the reception beams;
• and
• a transceiver configured to receive a random access message in the determined radio transmission resources through reception beams,
• wherein a number of the radio transmission resources used for the random access for each of the reception beams is determined by dividing a total number of random access resources of the UE by the number of the reception beams.