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METHOD AND APPARATUS FOR RANDOM ACCESS IN COMMUNICATIONS SYSTEM

  • US 20160192401A1
  • Filed: 12/29/2015
  • Published: 06/30/2016
  • Est. Priority Date: 12/29/2014
  • Status: Active Grant
First Claim
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1. A method for a random access of a terminal in a communications system using a plurality of beams, the method comprising:

  • determining a beam to be communicated with the terminal among the plurality of beams;

    determining a random access preamble from one group of a beam based preamble group and a cell based preamble group;

    transmitting the random access preamble through the determined beam; and

    if a random access response for the random access preamble is not received from a base station for a set interval, determining the random access preamble from another group and transmitting the determined random access preamble through the determined beam.

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