RADIO RECEPTION APPARATUS, RADIO TRANSMISSION APPARATUS, AND RADIO COMMUNICATION METHOD

摘要

Where first and second reference signals for a first and second communication system, respectively, are transmitted, resources that affect a reception apparatus compatible only with the first communication system can be minimized, and the throughput can be prevented from being deteriorated. As resources for a reference signal CSI-RS for LTE-A, last half symbols in a time direction of a resource unit RB/Sub-frame defined in a frequency-time domain are used, and the CSI-RS is allocated in a position up to the last two symbols or in the last symbol, or the like, of a particular RB/Sub-frame and transmitted when a reference signal 4RS for LTE is transmitted to a reception apparatus in addition to transmitting CSI-RS for LTE-A. The reception apparatus receives CSI-RS allocated in the last half symbol of RB/Sub-frame based on CSI-RS allocation information, measures channel quality by using this CSI-RS, and transmits and reports feedback information.

主权项

1. A receiving apparatus that receives a first reference signal for a first communication system and a second reference signal for a second communication system in a resource defined by a plurality of symbols divided in a former half and a latter half according to a time direction, a subframe being comprised of the plurality of symbols, the receiving apparatus comprising:
a receiving section configured to, in at least one mode of operation, receive the first reference signal mapped in symbols of both the former half and latter half, and receive the second reference signal mapped to only a last two symbols in the latter half, and a measuring section configured to calculate channel quality information using at least the second reference signal, wherein the first reference signal is a Long Term Evolution (LTE) reference signal and the second reference signal is an LTE-Advanced reference signal.