Radio communication apparatus and radio communication method

A radio communication method which uses a radio communication apparatus including a reception processing unit which receives a signal transmitted from a base station in radio communication, and a processor processing an indication signal which includes information about the base station and which is transmitted from the base station periodically, said processor conducting an authentication processing with the base station to establish communication connection between the base station and the radio communication apparatus, comprising

• maintaining the reception processing unit and the processor in OFF state while the reception processing unit is not receiving the indication signal, and
• processing the indication signal at the processor without processing the authentication when the reception processing unit receives the indication signal.

A radio communication apparatus comprising:

• a processor processing an indication signal which includes information indicating presence or absence of non-transmitted data to be transmitted from a base station to the radio communication apparatus, said processor processing an authentication processing with the base station to receive the non-transmitted data from the base station, said indication signal being transmitted from the base station periodically;
• wherein
• the radio communication apparatus can be in one of states including a first mode in which the processor processes the indication signal to receive the indication signal, a second mode in which the processor conducts the authentication processing to receive the non-transmitted data and a third mode in which the processor does not process the indication signal or conduct the authentication processing.