Mobile communication system, mobile station, base station, and control channel allocation method

A mobile station, comprising:

• a storage unit configured to establish a correspondence between an identifier for a downlink Layer-1 control channel associated with a downlink data channel and a frequency block number for an uplink Layer-1 control channel and to store the identifier and the frequency block number;
• a physical layer parameter determining unit configured to determine a physical channel parameter including the frequency block number for the uplink Layer-1 control channel based on the identifier;
• an uplink Layer-1 control channel generating unit configured to generate the uplink Layer-1 control channel used for transmitting a result of decoding data on the data channel based on the determined physical channel parameter;
• and
• a transmitting unit configured to transmit control information on the generated uplink Layer-1 control channel.

A base station, comprising:

• a storage unit configured to establish a correspondence between an identifier for a downlink Layer-1 control channel associated with a downlink data channel and a frequency block number for an uplink Layer-1 control channel and to store the identifier and the frequency block number;
• a reception quality measuring unit configured to measure reception quality on an uplink propagation path based on a signal transmitted from a mobile station;
• a downlink Layer-1 control channel generating unit configured to select a physical channel parameter including the frequency block number for the uplink Layer-1 control channel based on the reception quality on the uplink propagation path and generate the downlink Layer-1 control channel associated with the downlink data channel corresponding to the frequency block number;
• and
• a transmitting unit configured to transmit control information on the generated downlink Layer-1 control channel.

A control channel allocating method, comprising the steps of:

• a) measuring, by a base station, reception quality on an uplink propagation path based on a signal transmitted from a mobile station;
• b) selecting, by the base station, a physical channel parameter including a frequency block number for an uplink Layer-1 control channel based on the reception quality on the uplink propagation path and generating a downlink Layer-1 control channel associated with a downlink data channel corresponding to the frequency block number;
• c) transmitting by the base station, control information on the generated downlink Layer-1 control channel;
• d) receiving, by the mobile station, the control information on the downlink Layer-1 control channel associated with the downlink data channel;
• e) determining, by the mobile station, the physical channel parameter including the frequency block number for the uplink Layer-1 control channel corresponding to an identifier for the downlink Layer-1 control channel associated with the downlink data channel based on a predetermined correspondence between the identifier and the frequency block number;
• f) generating, by the mobile station, the uplink Layer-1 control channel used for transmitting a result of decoding data on the data channel based on the determined physical channel parameter;
• and
• g) transmitting, by the mobile station, control information on the generated uplink Layer-1 control channel.