Method for controlling transmission power in cellular system
First Claim
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1. A method of controlling transmission power of a base station in a cellular system, comprising:
- receiving a reference signal having a predetermined transmission power from at least one neighbor base station;
estimating a radio environment between the base station and the neighbor base station by using the reference signal; and
controlling a cell coverage of the base station to correspond with transmission power calculated based on the estimated radio environment, andwherein the estimating the radio environment comprises;
obtaining a path loss between the base station and the neighbor base station from the receiving power of the reference signal; and
estimating a distance between the base station and the neighbor base station from the path loss, andthe controlling the cell coverage comprises;
determining the transmission power using a correlation value between the reference signal transmitted from the neighbor base station and the reference signal received from the neighbor base station and setting the transmission power as a receiving power having a desired magnitude at a boundary of the controlled cell coverage in accordance with comparison of the correlation value with a threshold, where the cell coverage is variably set in accordance with the determining.
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Abstract
A method for controlling transmission power of a base station in a cellular system includes: receiving a reference signal from at least one neighbor base station that is located around the base station; estimating a radio environment between the base station and the neighbor base station by using the receiving power of the reference signal; and controlling cell coverage of the base station by determining the transmission power based on the radio environment.
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9 Claims
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1. A method of controlling transmission power of a base station in a cellular system, comprising:
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receiving a reference signal having a predetermined transmission power from at least one neighbor base station; estimating a radio environment between the base station and the neighbor base station by using the reference signal; and controlling a cell coverage of the base station to correspond with transmission power calculated based on the estimated radio environment, and wherein the estimating the radio environment comprises; obtaining a path loss between the base station and the neighbor base station from the receiving power of the reference signal; and estimating a distance between the base station and the neighbor base station from the path loss, and the controlling the cell coverage comprises; determining the transmission power using a correlation value between the reference signal transmitted from the neighbor base station and the reference signal received from the neighbor base station and setting the transmission power as a receiving power having a desired magnitude at a boundary of the controlled cell coverage in accordance with comparison of the correlation value with a threshold, where the cell coverage is variably set in accordance with the determining. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A base station, comprising:
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a reference signal receiver that receives a reference signal from a neighbor base station; a transmission power calculator that calculates transmission power by using the received reference signal; and a power controller that transmits the reference signal to the neighbor base station at predetermined power and transmits a signal to an user equipment in a cell formed to correspond with the transmission power calculated in the transmission power calculator, and wherein the transmission power calculator calculates the transmission power by estimating a distance between the base station and the neighbor base station by using a path loss between the base station and the neighbor base station, and determining the transmission power using a correlation value between the reference signal transmitted from the neighbor base station and the reference signal received from the neighbor base station, and the transmission power is set as a receiving power having a desired magnitude at a boundary of the cell coverage in accordance with comparison of the correlation value with a threshold, and the cell coverage is variably set in accordance with the determining. - View Dependent Claims (9)
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Specification