Ntt Docomo, Inc.

Shiro Kikuchi

Hitoshi Yoshino

Shinzo Ohkubo

Toru Otsu

A mobile station is configured to measure receiving qualities of respective signals from a first antenna and a second antenna of a base station (SS), store the results of the measurement, and request the base station to retransmit a signal from an antenna with a higher receiving quality, based on the stored measurement results, when an error is detected in received data thereafter (SSS). The base station retransmits the data, using the antenna with the higher receiving quality (i.e., a base station antenna to yield the higher receiving quality at the mobile station) (S). In another aspect, the mobile station measures a receiving quality of a signal and notifies the base station of the receiving quality. The base station selects a radio channel adapted to a receiving quality on the basis of the measurement result and transmits a signal, using the radio channel.

Mobile communication systems, mobile communication methods, base stations, mobile stations, and signal transmission methods in the mobile communication systems

The present invention relates to a radio communication system comprising base stations and mobile stations and a method for controlling transmission power in the system where the base station is able to perform multi-point transmission for transmitting the same signal to a plurality of the mobile stations. In the present invention, the mobile station targeted for the multi-point transmission provides the base station of an increase request or a decrease request of the transmission power by respectively transmitting or not transmitting a predetermined signal to the base station.

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Yokohama, Japan

Shiro Kikuchi