Wireless communication system, terminal, transmission station, and wireless communication program

摘要

A wireless communication system includes an upper transmission station and a lower transmission station, each serving as a transmission station, a terminal serving as a reception station. The upper transmission station allocates a downlink control channel for each terminal to part of a predetermined data-channel region ascribed to the lower transmission station based on a demodulation reference signal for each transmission station. Based on the allocation result, the lower transmission station allocates the downlink control channel for each terminal, which is disposed at art of the data-channel region thereof. The terminal decodes the downlink control channel based on the demodulation reference signal.

主权项

1. A wireless communication system including a plurality of transmission stations serving as an upper transmission station and a plurality of lower transmission stations ascribed to different sequence initial values in connection with a terminal serving as a reception station,
wherein each of the plurality of transmission stations has at least one ePDCCH (enhanced physical downlink control channel) available region disposed at a data-channel region among a plurality of radio resources, wherein the plurality of transmission stations are permutated in an order according to performance indexes thereof, wherein the upper transmission station generates a demodulation reference signal (DMRS) for each transmission station, wherein the upper transmission station selects a specific lower transmission station among the plurality of lower transmission stations according to the order of permutation, thus allocating the ePDCCH available region of the specific lower transmission station to an ePDCCH of the terminal, wherein the terminal decodes the ePDCCH by use of the demodulation reference signal corresponding to a sequence initial value of the specific lower transmission station, and wherein the upper transmission station selects the specific lower transmission station according to the order of permutation by way of: (i) selecting the specific lower transmission station having a highest performance index among the plurality of lower transmission stations; and (ii) selecting another specific lower transmission station whose performance index is lower than the highest performance index when the terminal fails to decode the ePDCCH based on the sequence initial value of the specific lower transmission station having the highest performance index.