Radio base station, channel assigning system and channel assigning method

Abstract

A radio base station, which assigns one or more communication channels for wireless communication with respective terminals, comprises a communication status grasping means that acquires the communication statuses of the communication channels assigned to the respective terminals; an interference channel grasping means that selects, based on the communication statuses acquired by the communication status grasping means, a communication channel exhibiting the worst communication status and selects one or more communication channels having an interference relationship with the communication channel exhibiting the worst communication status; a terminal grasping means that selects, from among the terminals to which the selected communication channels having the interference relationship have been assigned, a terminal exhibiting the best communication status; and a communication channel assigning means that assigns, from among the communication channels selected by the interference channel grasping means, a communication channel, which has been assigned to the terminal selected by the terminal grasping means, to a terminal that communicates anew with the radio base station.

Description

Wireless base station, channel allocation system and channel allocation method technical field The present invention relates to a wireless base station that assigns one or more communication channels to each terminal to perform wireless communication, and a corresponding channel assignment system and method. This application claims priority from Japanese Patent Application No. 2005-315195 filed on October 28, 2005, the contents of which are incorporated herein by reference. Background technique In a conventional wireless communication system including a wireless base station and a terminal communicating with it, when a wireless base station assigns a channel to a terminal, a channel with a high priority is selected, and a power ratio (of useful wave to interference wave) is selected to be greater than or equal to a predetermined threshold Channel. The predetermined threshold is set to a different value according to the priority of each channel. The priority of each chan...

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Problems solved by technology

However, if two terminals move and move closer to each other, the power ratio of wanted wave to interfering wave may suddenly deteriorate for all channels

Therefore, when a wireless base station performs multi-carrier frequency allocation, if the allocation is simply performed based on the reception quality (for example, SINR (Signal-to-Interference-and-Noise Ratio)) of each terminal at each corresponding time, the amount of interference is relatively small. There is likely to be a significant difference in the amount of interference between a small terminal and a terminal with a large amount of interference

Therefore, the throughput varies between terminals, and it is impossible to ensure fairness between terminals

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