Communication method and communication system

A communication system for performing communication using one or more subchannels between a cell station and a plurality of personal stations, the communication system comprising,:

• a downlink frame generator that generates a downlink frame for a downlink period in which the cell station communicates with at least one of the plurality of personal stations in a predetermined frame format;
• and
• an uplink frame generator that generates an uplink frame for an uplink period in which at least one of the plurality of personal stations communicates with the cell station in a predetermined frame format,
• wherein the frame format of the downlink frame includes a MAP field that notifies, in the downlink period, each personal station of information indicating an available or unavailable subchanel for each personal station, and wherein
• the frame format of the uplink frame includes a Refuse MAP (RMAP) field that notifies, in the uplinkperiod, the cell station from a personal station of information distinguishing a subchannel to be used from a subchannel to be unused by the corresponding personal station among the available subchannels after notifying each personal station of the information.