Radio communication terminal and transmission power control method

A radio communication terminal for measuring a signal to interference power ratio (SIR) of a received signal, comparing the measured SIR with a target SIR, and transmitting to a base station transmission power control (TPC) information based on a result of the comparison, comprising:

• a quality measuring section for measuring the communication quality of received data;
• a quality comparing section for comparing the measured communication quality with a target communication quality;
• a retaining section for retaining a target SIR updated based on a result of the comparison;
• and
• a counter section for outputting a timing signal to the quality comparing section, wherein
• the quality comparing section compares the target communication quality with the communication quality measured when a predetermined amount of data is received, and the quality comparing section compares the target communication quality with the communication quality measured when a timing signal is received from the counter section.