Base station apparatus and information feedback method

摘要

To suitably transmit feedback information for rank adaptation and precoding in uplink MIMO transmission to a user apparatus as feedback, a base station apparatus (200) is characterized by having a precoding weight/rank number selecting section (232) that determines rank information associated with the number of layers of spatial multiplexing in uplink, while determining a control amount of a transmission phase and/or transmission amplitude used in weighting for transmission antennas of a user apparatus, and transmission/reception sections (206a), (206b) that transmit the rank information determined in the precoding weight/rank number selecting section (232) to a mobile station (100) using an RRC signal, while transmitting the control amount to the mobile station (100) using a control channel signal.

主权项

1. A base station apparatus comprising:
a rank information determining section configured to determine rank information associated with the number of layers of spatial multiplexing in uplink; a control amount determining section configured to determine a control amount of a transmission phase and/or transmission amplitude used in weighting for transmission antennas of a user apparatus; a code book in which a plurality of kinds of indexes is defined, the indexes each representing a combination of a control amount of a transmission phase and/or transmission amplitude and rank information indicating the number of layers of spatial multiplexing; and a transmission section configured to select an index associate with a combination of the rank information determined in the rank information determining section, and the control amount determined in the control amount determining section from the code book and transmit the index to the user apparatus using a control channel signal, wherein the rank information determining section determines the rank information corresponding to the optimal number of layers for each cluster block when resource blocks of a band assigned to the user apparatus are divided into a plurality of cluster blocks such that a part of sub-bands are discrete.