Transmission power adjustment method in wireless communication system and base station

摘要

Necessary transmission power of terminals is secured while suppressing total transmission power in base station, so that FFR technology is realized with high frequency utilization efficiency to thereby realize both of compactness of base station and increase of communication capacity. Frequency resource is divided into frequency for boundary area of cell and frequency for central area of cell. Transmission power per unit frequency is fixed in the frequency for boundary area of cell and is set to be variable in the frequency for central area of cell. Transmission power per unit frequency is adjusted so as to satisfy necessary power of terminals connected to frequency for central area of cell. When it is judged that total transmission power of base station exceeds prescribed value, terminal is moved from central area to boundary area of cell, so that total transmission power is suppressed to be equal to or smaller than standard.

主权项

1. A base station which communicates with a plurality of terminals in a wireless communication system by radio, comprising a controller of the base station configured to:
divide a frequency band allocated to the wireless communication system into a plurality of frequency bands; when a first frequency band of the plurality of frequency bands is allocated to a first terminal group and a second frequency band is allocated to a second terminal group different from the first terminal group to make communication, then
control a total transmission power for the first and the second terminal groups to be equal to or smaller than a threshold value of a maximum total transmission power previously set for the base station; andfix a transmission power per sub-carrier in the first frequency band, comprising:
calculating the transmission power per sub-carrier based on a target transmission power of each of the plurality of terminals for satisfying a previously set threshold in the second frequency band;comparing a value of the total transmission power with the maximum total transmission power;adjusting power based on the calculation of the transmission power per sub-carrier in a case in which a value of the maximum total transmission power is less than the threshold value; andfurther calculating the total transmission power when an increased number of terminals among the plurality of terminals are to be allocated to the first terminal group in a case in which the value of the maximum total transmission power is greater than or equal to the threshold value.