Wireless communication system, base station device and mobile station device

A mobile station device performing wireless communications with a base station by use of a plurality of communication channels and a pilot channel corresponding to at least one of the plurality of communication channels, the mobile station device comprising:

• a measuring unit to measure a reception level of the pilot channel transmitted from the base station;
• an acquiring unit to acquire identifying information for distinguishing between a priority channel to be used preferentially in the wireless communications by the base station and the other channels, and a predetermined correction value transmitted via the communication channel other than the pilot channel from the base station;
• a determining unit to determine at least one of the plurality of communication channels as an available communication channel based on the identifying information and the predetermined correction value acquired by the acquiring unit and the reception level measured by the measuring unit by subtracting the predetermined correction value from the reception level corresponding to the other channels;
• and
• a transmitting unit to generate downlink channel information indicating at least one available communication channel as a downlink communication channel and to transmit the downlink channel information to the base station.

A mobile communication system comprising a mobile station and a base station, which perform wireless communications by use of a plurality of communication channels and a pilot channel corresponding to at least one of the plurality of communication channels,

• the base station including:
• a transmitting unit to set at least one of the plurality of communication channels as a priority channel to be used preferentially in the wireless communications by the base station and
• to transmit identifying information for distinguishing between the priority channel and the other channels and a predetermined correction value, to the mobile station by use of the communication channel other than the pilot channel,
• the mobile station including:
• a measuring unit to measure a reception level of the pilot channel transmitted from the base station;
• an acquiring unit to acquire the identifying information and the predetermined correction value which are transmitted via the communication channel other than the pilot channel from the base station;
• and
• a determining unit to determine at least one of the plurality of communication channels as an available communication channel based on the identifying information and the predetermined correction value acquired by the acquiring unit and the reception level measured by the measuring unit, by subtracting the predetermined correction value from the reception level corresponding to the other channels,
• wherein the mobile station includes:
• a transmitting unit to transmit downlink channel information indicating at least one available communication channel as a downlink communication channel to the base station, and
• the base station includes:
• a receiving unit to receive the downlink channel information from the mobile station and
• a selecting unit to select at least one communication channel as the downlink communication channel used for transmitting data addressed to the mobile station in the plurality of communication channels based on the downlink channel information from the mobile station.