Patent ID: 7586977

Claim:
A transmission power control method for controlling, based on a plurality of reference transmission format and a plurality of normal transmission format, using an error correction coding process, transmission power of an enhanced dedicated physical data channel for transmitting uplink user data, wherein the reference transmission format includes a reference transmission data block size, and a reference gain factor which indicates a transmission power ratio between the enhanced dedicated physical data channel and a dedicated physical control channel or indicates a transmission wave amplitude ratio between the enhanced dedicated physical data channel and the dedicated physical control channel, and the normal transmission format includes a normal transmission data block size, and a normal gain factor which indicates a transmission power ratio between the enhanced dedicated physical data channel and the dedicated physical control channel or indicates a transmission wave amplitude ratio between the enhanced dedicated physical data channel and the dedicated physical control channel, and the transmission power control method comprises: determining and storing, at a mobile station, the reference transmission data block size and the reference gain factor for each of the plurality of the reference transmission format and the normal transmission data block size for each of the plurality of the normal transmission format, based on control information transmitted from a radio network controller; and calculating and storing, at the mobile station, the normal gain factor for each of the plurality of normal transmission format including the normal transmission data block size, based on the reference transmission data block size and the reference gain factor included in the certain reference transmission format and the normal transmission data block size, and wherein the mobile station calculates, based on the reference transmission format having the smallest reference transmission data block size, a normal gain factor having the normal transmission data block size smaller than a second smallest reference transmission data block size, when a transmission format having the smallest transmission block size among the stored reference transmission data block size and the stored normal transmission data block size is not set as the reference transmission format.