Base station and mobile communication system

A base station which transmits and receives information to and from a plurality of radio stations through radio channels including control channels and communication channels separated by different codes, said control channels include a common control channel and a dedicated control channel, said base station comprising:

• a common control channel demodulator which demodulates spread signals inputted via the common control channel without executing cross-correlation interference cancellation processing;
• and
• an interference canceller which executes cross-correlation interference cancellation processing among the dedicated control channel and the communication channels as to spread signals inputted via the communication channels, and which outputs signals resulting from the cross-correlation interference cancellation processing as demodulated signals;
• wherein said base station executes the cross-correlation interference cancellation processing except in the common control channel in a call control course.

A base station to communicate with radio stations through control channels and communication channels spread by different codes, said control channels include a common control channel and a dedicated control channel, said base station comprising:

• an antenna constellation which receives spread signals from the plurality of radio stations, a reception amplifier which amplifies the signals from said radio stations as received by said antenna constellation, a radio transmitter/receiver which converts reception signals from said reception amplifier into baseband signal frequencies, and a baseband processor which executes reception synchronization, despreading, cross-correlation interference cancellation, error correction decoding, and data multiplexing/demultiplexing of the baseband signals from said radio transmitter/receiver;
• wherein said baseband processor includes:
• a common control channel demodulator which demodulates the spread signals inputted via the common control channel without executing cross-correlation interference cancellation processing;
• and
• an interference canceller which executes cross-correlation interference cancellation processing among the dedicated control channel and the communication channels as to the spread signals inputted via the communication channels, and which outputs signals resulting from the cross-correlation interference cancellation processing as demodulated signals;
• wherein said base station executes the cross-correlation interference cancellation processing except in the common control channel in a call control course.

A mobile communication system having a plurality of radio stations and a base station which is connected to a network through a base station controller, and which transmits and receives information to and from the plurality of radio stations through control channels and communication channels separated by different codes, said control channels include a common control channel and a dedicated control channel, said base station comprising:

• a common control channel demodulator which demodulates spread signals inputted via the common control channel without executing cross-correlation interference cancellation processing;
• an interference canceller which executes cross-correlation interference cancellation processing among the dedicated control channel and the communication channels as to spread signals inputted via the communication channels, and which outputs signals resulting from the cross-correlation interference cancellation processing as demodulated signals;
• and
• an error correction processor which executes error correction processing for the signals from said interference canceller, and which transmits the resulting signals to said station controller;
• wherein said base station executes the cross-correlation interference cancellation processing among the dedicated control channel and the communication channels except in the common control channel in a call control course.