54results about How to "Improve frequency utilization efficiency" patented technology

The present invention makes up for shortages of a central control type and a distributed control type radio communications systems, not only restrains interference of radio stations using the same radio communications system, and also restrain the interference of the surrounding radio stations, thereby effectively using a frequency source. The radio communications system includes a radio station connecting with a network (a network connecting radio station) and a counterparty radio station. The network connecting radio station obtains information A of a radio communication status through the network and transmits to the counterparty radio station. The information A comprises using frequency information of the radio station and waveform characteristic quantity information indicating statistic properties of signal waveforms transmitted by the radio station. The counterparty radio station calculates a measured value of the waveform characteristic quantity of the signal received from another radio station and reports the measured value to the network connecting radio station aiming at each part of the announced waveform characteristic quantity. The network connecting radio station determines whether to communicate or not and a radio source according to the information A and the information reported by the counterparty radio station.

when the SC-FDMA method is used in combination with the multi-antenna transmission technique, a radio transmission method effectively improves the frequency use efficiency by performing appropriate frequency allocation to a plurality of antennas while suppressing degradation of the reception quality caused by interference. In the radio transmission method of the SC-FDMA type, according to the number of terminals simultaneously accessing a base station within a usable frequency band, it is possible to allocate all the transmission signals (transmission stream) to be transmitted by different antennas to different frequency bands or to use the MIMO transmission in combination. Moreover, according to the number of terminals making an access, the number of terminals which perform the MIMO transmission can be varied.

Provided are a terminal device, a base station device and a communication method which can improve reliability and frequency utilization efficiency when using beamforming for transmission. The terminal device comprises a reception unit that receives a downlink shared channel including configuration information, downlink control information and transport blocks, and a signal detection unit that uses the redundancy version included in the downlink control information to decode the downlink shared channel. The configuration information includes the number of consecutive slots in which the same transport block will be repeatedly transmitted. A demodulation reference signal (DRMS) to be transmitted in at least two of the consecutive slots is not related to quasi-colocation (QCL). The redundancy version is determined from the slot index of the consecutive slots, and information indicating the QCL.