METHOD AND APPARATUS FOR RANDOM ACCESS IN COMMUNICATIONS SYSTEM
First Claim
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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Accused Products
Abstract
In a communications system using a plurality of beams, a terminal determines a beam to be communicated with the terminal among the plurality of beams, determines one sequence among sequences allocated to the determined beam as a beam based random access preamble, and transmits the beam based random access preamble through the determined beam. In addition, if a random access response for the beam based random access preamble is not received from a base station for a set interval, the terminal determines one sequence among sequences in a cell based random access preamble collection as a cell based random access preamble and transmits the cell based random access preamble.
117 Citations
20 Claims
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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:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for a random access of a base station in a communications system using a plurality of beams, the method comprising:
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performing a detection operation of a random access preamble transmitted from a terminal from a resource allocated to a random access for each beam; if a beam based random access preamble is detected from any one of the plurality of beams, transmitting a random access response to the terminal using the beam from which the beam based random access preamble is detected; and if a cell based random access preamble is detected from at least one of the plurality of beams, transmitting the random access response to the terminal using a beam to which the terminal belongs. - View Dependent Claims (9, 10, 11, 12, 13)
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14. An apparatus for a random access of a terminal in a communications system using a plurality of beams, the apparatus comprising:
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a processor determining a beam to be communicated with the terminal among the plurality of beams, determining a beam based random access preamble among sequences allocated to the determined beam, and determining a cell based random access preamble among sequences in a cell based preamble collection; and a transceiver transmitting the cell based random access preamble by a set condition after transmitting the beam based random access preamble. - View Dependent Claims (15, 16)
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17. An apparatus for a random access of a base station in a communications system using a plurality of beams, the apparatus comprising:
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a processor performing a detection operation of a beam based random access preamble using sequences allocated to a corresponding beam from a resource allocated to a random access for each beam, performing a detection operation of a cell based random access preamble using sequences in a cell based preamble group for each beam, and generating a random access response when a random access preamble is detected by the detection operation of the beam based random access preamble or the detection operation of the cell based random access preamble; and a transceiver transmitting the random access response to a terminal. - View Dependent Claims (18, 19, 20)
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Specification