Communications apparatus and communications system using multicarrier transmission mode

1. A communications system for exchange of information between a base station and a terminal by a multicarrier transmission mode using a plurality of subcarriers, the communication system comprising:

the base station comprising:

a transmission data generator configured to generate dedicated frequency band information indicating which frequency band is to be used for transmission of dedicated data information between the base station and the terminal;

a transmitter configured to transmit the dedicated frequency band information by using a specific frequency band which is set from among a plurality of frequency bands assigned to the communications system, and to transmit the dedicated data information by using at least one frequency band set from among said plurality of frequency bands; and

the terminal comprising:

a receiver configured to receive the dedicated frequency band information by using the specific frequency band, wherein

one or more of said frequency bands of the plurality of frequency bands is assigned consecutive with said specific frequency band along a frequency axis.

2. A communications system for exchange of information between a base station and a terminal by a multicarrier transmission mode using a plurality of subcarriers, the communication system comprising:

the base station comprising:

a transmission data generator configured to generate dedicated frequency band information indicating which frequency band is to be used for transmission of dedicated data information between the base station and the terminal;

a transmitter configured to transmit the dedicated frequency band information by using a specific frequency band which is set from among a plurality of frequency bands assigned to the communications system, and to transmit the dedicated data information by using at least one frequency band set from among said plurality of frequency bands; and

the terminal comprising:

a receiver configured to receive the dedicated frequency band information by using the specific frequency band, wherein

one or more of said frequency bands of the plurality of frequency bands is assigned not consecutive with said specific frequency band along a frequency axis.

3. A communications system for exchange of information between a base station and a terminal by a multicarrier transmission mode using a plurality of subcarriers, the communication system comprising:

the base station comprising:

a transmission data generator configured to generate dedicated frequency band information indicating which frequency band is to be used for transmission of dedicated data information between the base station and the terminal;

a transmitter configured to transmit the dedicated frequency band information by using a specific frequency band which is set from among a plurality of frequency bands assigned to the communications system, and to transmit the dedicated data information by using at least one frequency band set from among said plurality of frequency bands, and

the terminal comprising:

a receiver configured to receive the dedicated frequency band information by using the specific frequency band, wherein

one or more of said frequency bands of the plurality of frequency bands is assigned not consecutive with other frequency bands along a frequency axis.

4. A base station for exchange of information with a terminal in a communications system, the base station comprising:

a transmission data generator configured to generate dedicated frequency band information indicating which frequency band is to be used for transmission of dedicated data information between the base station and a terminal;

a transmitter configured to transmit the dedicated frequency band information by using a specific frequency band which is set from among a plurality of frequency bands assigned to the communications system, and to transmit the dedicated data information by using at least one frequency band set from among said plurality of frequency bands, wherein

one or more of said frequency bands of the plurality of frequency bands is assigned consecutive with said specific frequency band along a frequency axis.

5. A terminal for exchange of information with a base station in a communications system, the terminal comprising:

a receiver configured to receive a dedicated frequency band information indicating which frequency band is to be used for transmission of dedicated user data information between the terminal and the base station by using a specific frequency band, and to receive the dedicated user data information by using at least one frequency band set from among said plurality of frequency bands; wherein,

one or more of said frequency bands of the plurality of frequency bands is assigned consecutive with said specific frequency band along a frequency axis.

6. A base station for exchange of information with a terminal in a communications system, the base station comprising:

a transmission data generator configured to generate dedicated frequency band information indicating which frequency band is to be used for transmission of dedicated data information between the base station and a terminal;

a transmitter configured to transmit the dedicated frequency band information by using a specific frequency band which is set from among a plurality of frequency bands assigned to the communications system, and to transmit the dedicated data information by using at least one frequency band set from among said plurality of frequency bands, wherein

one or more of said frequency bands of the plurality of frequency bands is assigned not consecutive with said specific frequency band along a frequency axis.

7. A terminal for exchange of information with a base station in a communications system, the terminal comprising:

a receiver configured to receive a dedicated frequency band information indicating which frequency band is to be used for transmission of dedicated user data information between the terminal and the base station by using a specific frequency band, and to receive the dedicated user data information by using at least one frequency band set from among said plurality of frequency bands; wherein,

one or more of said frequency bands of the plurality of frequency bands is assigned not consecutive with said specific frequency band along a frequency axis.

8. A base station for exchange of information with a terminal in a communications system, the base station comprising:

a transmission data generator configured to generate dedicated frequency band information indicating which frequency band is to be used for transmission of dedicated data information between the base station and a terminal;

a transmitter configured to transmit the dedicated frequency band information by using a specific frequency band which is set from among a plurality of frequency bands assigned to the communications system, and to transmit the dedicated data information by using at least one frequency band set from among said plurality of frequency bands, wherein

one or more of said frequency bands of the plurality of frequency bands is assigned not consecutive with other frequency band along a frequency axis.

9. A terminal for exchange of information with a base station in a communications system, the terminal comprising:

a receiver configured to receive a dedicated frequency band information indicating which frequency band is to be used for transmission of dedicated user data information between the terminal and the base station by using a specific frequency band, and to receive the dedicated user data information by using at least one frequency band set from among said plurality of frequency bands; wherein,

one or more of said frequency bands of the plurality of frequency bands is assigned not consecutive with other frequency band along a frequency axis.