Ntt Docomo, Inc.

Kozue Hamamoto

Hitoshi Yoshino

Toru Otsu

Satoru Fukumoto

This invention relates to a frequency channel assignment system which enables adaptive overlapping use of the same frequency band in a plurality of radio communications systems. The frequency channel assignment system includes radio communications systemsandwhich use a common frequency band, and controllersand. The controllersandinclude a system characteristics information management functionconfigured to manage system characteristics information showing characteristics of frequency channels in the radio communications systemsand, and a frequency channel assignment functionconfigured to assign frequency channels to each of the radio communications systemsand, based on the system characteristics information and channel status information showing status of frequency channels, so as to avoid inter-system interference.

Frequency channel assignment system, base station, control station, inter-system common control apparatus, frequency channel assignment method, and control method

A radio communication system for carrying out communications between radio stations by modulating a plurality of signal sequences to be transmitted and received into at least one frequency channel assigned to each of a plurality of cells is formed by a channel mapping means for rearranging for each cell a plurality of frequency channels assigned with respect to each cell, and newly assigning particular frequency channels as a transmission and reception band of said signal sequences, and a bandwidth control means for controlling a bandwidth of said assigned frequency channel according to a propagation state of said assigned frequency channel.

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Yokohama, Japan

Kozue Hamamoto