Wireless base station transmission power control method and the wireless base station

Abstract

A wireless base station (2) controls to decrease a transmission power of a first wireless terminal (3) corresponding to signal quality information exceeding lower limitation of a range in which a transmission scheme to be selected remains unchanged and below a first threshold value, which is greater than the lower limitation and smaller than upper limitation of the range, among a plurality of wireless terminals (3) corresponding to signal quality information belonging to the range, while controlling to increase a transmission power of a second wireless terminal (3) corresponding to signal quality information equal to or greater than the first threshold value so that a transmission scheme having a better transmission efficiency is selected, thereby to improve throughput of a communication between the wireless base station (2) and the wireless terminal (3).

Description

technical field [0001] The present invention relates to a transmission power control method of a radio base station and a radio base station. The present invention is applicable, for example, to a wireless communication system in which a modulation scheme, an error correction coding rate, etc. used in communication between a wireless terminal and a wireless base station are changed in accordance with the signal quality of a wireless section. Background technique [0002] In a wireless communication system having a wireless base station (BS: Base Station) and a wireless terminal (MS: Mobile Station), the MS can communicate with other MSs, wired terminals, servers, and the like through the BS. [0003] As one of the wireless communication systems described above, there is a WiMAX system developed in recent years based on a system called WiMAX (World wide Interoperability for Microwave Access). In this WiMAX system, an Orthogonal Frequency Division Multiple Access (OFDMA: Orth...

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Problems solved by technology

[0023] That is, in a radio frame, there is an upper limit to the sum of the transmission power in a certain symbol (time) in the direction of the frequency axis (subcarrier frequency) due to laws and regulations, limitations of transmission amplifiers, etc., so in a certain symbol, When the bursts are allocated so that all the subcarriers in the frequency axis direction can be used, and the transmission power reaches the above upper limit, the above-mentioned transmission power increase control cannot be performed.

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