| 摘要 |
PROBLEM TO BE SOLVED: To reduce increase of interference due to plural base station transmission at the time of soft hand-off and to obtain a high downstream line capacity by controlling transmitting power for allowing only a primary base station being a base station whose propagation loss with respect to a mobile station is made minimum at the time of the soft hand-off to operate transmission with proper power, and allowing a base station other than the primary base station to operate transmission with reduced power. SOLUTION: A mobile station MS moving to a Cus direction operates soft hand-off with three base stations BS#1, BS#2, and BS#3. The mobile station MS always transmits a transmission power control information symbol Spct to the base stations BS#1-BS#3. Also, the output of a variable output amplifier is controlled as a control value Pct 1 in a prescribed method in the base stations BS#1-BS#3. In this transmission power control method, a primary base station whose propagation loss can be made always the minimum can be selected according to the receiving level of a pilot signal received by the mobile station MS. |
