| 摘要 |
PROBLEM TO BE SOLVED: To set the transmission power of respective stations to a proper level when a base station and a slave station execute two-way radio communication mainly by a spread spectrum system. SOLUTION: At first, the base station transmits power control data for designating the transmission output level of the slave station from an antenna 7 together with information data, etc. The slave station which receives the control data sets a transmission output based on the data and transmits it from the antenna 31 to the base station. The base station which receives it compares data Dx indicating its reception level with a reference level Dy by a comparing part 17. When the reception level exceeds the reference level in the comparison, the transmission output is lowered for the portion of the set level. When the reception level is lower than the reference level, the transmission output is raised for the portion of the set level and also power control data for permitting the transmission output level to be the same as that of the base station is transmitted to the slave station. The slave station re-sets the transmission output based on the data and re-transmits it to the base station. The processings are repeated so as to execute converge in the neighborhood of the reference level. |
