Transmission power control apparatus and method in a wireless communication system

A mobile communication system comprising a mobile station that is capable of controlling a transmission power, a base transceiver station that carries out the transmission power control for said mobile station based on data from said mobile station and a frame error rate stored in advance, and a transmission power control apparatus that can update the frame error rate of said base transceiver station BTS based on a frame error rate within a predetermined segment and plural pieces of quality information per frame on plural frames included in the predetermined segment, the system comprising:

• said transmission power control apparatus comprises:
• a measuring section that measures the frame error rate within the predetermined segment,
• an acquiring section that acquires average frame quality information acquired by averaging the plural pieces of quality information per frame based on statistical information of the plural pieces of quality information per frame,
• a translation table that stores the frame error rate measured by said measuring section and the average frame quality information acquired by said acquiring section, wherein the frame error rate and the average frame quality information are associated with each other, and
• a transmission power control section that estimates an estimated frame error rate corresponding to the quality information per frame acquired by said acquiring section from said translation table, and controls a target receive power threshold based on the estimated frame error rate and a target frame error rate stored, thereby controlling a transmission power of an opponent communication apparatus.

A power control method in a mobile communication system comprising a mobile station that is capable of controlling a transmission power, a base transceiver station that carries out the transmission power control for the mobile station based on data from the mobile station MS and a frame error rate stored, and a transmission power control apparatus that can update the frame error rate of the base transceiver station BTS based on a frame error rate within a predetermined segment and plural pieces of quality information per frame on plural frames included in the predetermined segment, the method characterized by comprising steps of:

• measuring the frame error rate within the predetermined segment,
• averaging the plural pieces of quality information per frame,
• producing a translation table that stores the frame error rate measured by said measuring and the average frame quality information acquired by said averaging, wherein the frame error rate and the average frame quality information are associated with each other,
• estimating an estimated frame error rate corresponding to the quality information per frame from the translation table, and
• controlling the transmission power based on the estimated frame error rate and a target frame error rate stored.