Abstract: 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 systems 1 and 2 which use a common frequency band, and controllers 31 and 141. The controllers 31 and 141 include a system characteristics information management function 317 configured to manage system characteristics information showing characteristics of frequency channels in the radio communications systems 1 and 2, and a frequency channel assignment function 1411 configured to assign frequency channels to each of the radio communications systems 1 and 2, based on the system characteristics information and channel status information showing status of frequency channels, so as to avoid inter-system interference.

Abstract: 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.

Abstract: 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 systems 1 and 2 which use a common frequency band, and controllers 31 and 141. The controllers 31 and 141 include a system characteristics information management function 317 configured to manage system characteristics information showing characteristics of frequency channels in the radio communications systems 1 and 2, and a frequency channel assignment function 1411 configured to assign frequency channels to each of the radio communications systems 1 and 2, based on the system characteristics information and channel status information showing status of frequency channels, so as to avoid inter-system interference.

Abstract: 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.

Abstract: According to the present invention, a control station 5 determines a number of groups to which cells belong, based on interference between the cells. Preferably, the control station 5 determines the number of groups as a number smaller than the number of cells constituting a closed cluster. The control station 5 determines the groups to which the cells belong, so as to keep constant shortest distances between cells belonging to the same group. Then the control station 5 determines a frequency band to be assigned to a cell belonging to a determined group, in each of the group units, and assigns different frequency bands to the respective groups.