User equipment and power control method for random access
First Claim
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1. A power control method for random access of a terminal in a mobile communication system, the method comprising:
- receiving, by the terminal, reference signal information for a plurality of reference signals for a plurality of antenna ports via a higher layer;
measuring a plurality of pathlosses for the plurality of the antenna ports of a base station, using the plurality of the reference signals and reference signal power information included in the reference signal information;
calculating a transmit power of a random access preamble using a pathloss having a smallest value among the measured pathlosses; and
transmitting the random access preamble using the calculated transmit power.
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Abstract
An improved power control method and apparatus of a mobile terminal is provided for facilitating random access procedure in a mobile communication system based on a distributed antenna system. A method includes receiving, by the terminal, system information from a base station, the system information including transmit power information for transmitting a random access preamble; calculating a transmit power using the transmit power information; and transmitting the random access preamble using with the calculated transmit power.
21 Citations
18 Claims
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1. A power control method for random access of a terminal in a mobile communication system, the method comprising:
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receiving, by the terminal, reference signal information for a plurality of reference signals for a plurality of antenna ports via a higher layer; measuring a plurality of pathlosses for the plurality of the antenna ports of a base station, using the plurality of the reference signals and reference signal power information included in the reference signal information; calculating a transmit power of a random access preamble using a pathloss having a smallest value among the measured pathlosses; and transmitting the random access preamble using the calculated transmit power. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An apparatus for controlling transmit power in a mobile terminal, the apparatus comprising:
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a receiver configured to receive reference signal information for a plurality of reference signals for a plurality of antenna ports via a higher layer; a power control controller configured to measure a plurality of pathlosses for the plurality of the antenna ports of a base station, using the plurality of the reference signals and reference signal power information included in the reference signal information, to calculate a transmit power of a random access preamble using a pathloss having a smallest value among the measured pathlosses, and to transmit the random access preamble using the calculated transmit power. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A random access method of a base station in a mobile communication system, the method comprising:
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transmitting, by the base station to a terminal, reference signal information for a plurality of reference signals for a plurality of antenna ports via a higher layer; and receiving a random access preamble from the terminal, wherein a plurality of pathlosses for the plurality of the antenna ports of a base station is measured, by the terminal, using the plurality of the reference signals and reference signal power information included in the reference signal information, and wherein a transmit power of the random access preamble is calculated, by the terminal, using a pathloss having a smallest value among the measured pathlosses. - View Dependent Claims (14, 15)
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16. A base station that performs random access in a mobile communication system, the base station comprising:
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a transceiver that transceives signals with a terminal; and a power control controller configured to transmit reference signal information for a plurality of reference signals for a plurality of antenna ports to the terminal via a higher layer, and receive a random access preamble from the terminal, wherein a plurality of pathlosses for the plurality of the antenna ports of a base station is measured, by the terminal, using the plurality of the reference signals and reference signal power information included in the reference signal information, and wherein a transmit power of the random access preamble is calculated, by the terminal, using a pathloss having a smallest value among the measured pathlosses. - View Dependent Claims (17, 18)
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Specification