Patent ID: 8917678

Claim:
A wireless terminal comprising: an antenna configured to transmit a radio signal with a transmission power to a base station, the transmission power being determined based on quality of radio channel between the wireless terminal and the base station and determined so as not to exceed a maximum transmission power, the maximum transmission power being smaller as a number of subcarriers used by the radio signal is larger; a memory; and a processor configured to control the antenna to transmit a first request signal of the radio signal using a first number of the subcarriers, the first request signal for requesting an access right to the base station; to control the antenna to transmit a second request signal of the radio signal using a second number of the subcarriers, the second number being smaller than the first number, the second request signal for requesting a communication resource based on the access right assigned by the base station in response to the first request signal; to control the antenna so as to transmit the second request signal when the memory stores transmission data to be transmitted using the communication resource assigned by the base station in response to the second request signal; and to determine whether to control the antenna so as to transmit the second request signal or not based on the transmission power when the memory does not store the transmission data.