Oki Electric Industry Co., Ltd.

Yamaha Hatsudoki Kabushiki Kaisha

Masahiro Nishino

Satoshi Isokari

Yasunari Asaeda

Shinichi Satou

Fumitaka Kurasaki

Motorcycle

A transmission power control device is provided for controlling transmission power of a transmission signal, so that interference between transmission signals to a plurality of mobile stations is reduced. The transmission power control device of the present invention comprises a total transmission power monitoring section for monitoring total transmission power being transmitted to a plurality of mobile stations by a base station and outputting a monitor signal, a target total transmission power setting section for calculating a total transmission power value applicable to a base station and outputting a setting signal, an adder , a multiplier , an adder , a delay circuit , a limiter , a desired SIR setting section and an adder

Adaptive downlink transmission power control arbiter

A power transmission control apparatus for a CDMA system is disclosed which determines, with each of signals received from a plurality of mobile terminals, a difference between a power ratio to a total interference power to a requested power ratio, and controls the transmission power of the individual terminal on the basis of the above difference. The difference is weighted in accordance with communication quality required of the individual received signal so as to produce an evaluation value. The transmission power requested of the individual mobile terminal is updated such that the evaluation value decreases. Even when the number of calls increases and aggravates the difference of the signal weighted little, the evaluation value associated with such a signal varies little. At the same time, the signal weighted much can maintain the existing communication quality. When the difference of the signal weighted much increases, the evaluation value varies noticeably and allows the transmission power to be varied accordingly. It follows that the transmission power associated with the signal weighted much can be controlled adequately and rapidly.

Transmission power control apparatus for a CDMA system

Growing community of inventors

Tokyo, Japan

Masahiro Nishino