Patent ID: 8694045

Claim:
A radio communication apparatus comprising: a radio interface configured to transmit or receive a radio signal; and a processor configured to control the radio interface to transmit a Ranging signal to a base station with a first transmission power level and to retransmit, when a response to the Ranging signal is not received from the base station, the Ranging signal to the base station; wherein for retransmitting the Ranging signal, in a first retransmission phase, the processor controls the radio interface to retransmit the Ranging signal with the same transmission power level as the first transmission power level or with a transmission power level that is calculated in the same way as the first transmission power level, in a second retransmission phase, the processor controls the radio interface to retransmit the Ranging signal with a transmission power level that is increased by degrees, and the first retransmission phase is switched to the second retransmission phase, when a specified condition is satisfied.