無線通信システム、基地局装置、ユーザ端末、及び無線通信方法

Radio communication system, base station device, user terminal, and radio communication method

Abstract

【課題】複数種類のCSIプロセスが設定された場合において、処理負荷を軽減すると共に、スループット特性の劣化を抑えることができる無線通信システム、基地局装置、ユーザ端末、及び無線通信方法を提供すること。 【解決手段】本発明の無線通信方法は、CSIを測定するためのCSI−RSを送信する複数の基地局装置と、複数の基地局装置と通信するユーザ端末とを備え、SMRとIMRの組み合わせであるCSIプロセスが複数設定されている場合に、基地局装置において、サブフレーム番号N−4以前に遡って一番近いCSI参照リソースを用いてCSIを求めるCSIプロセスを決定し、ユーザ端末において、基地局装置で決定されたCSIプロセスを判断し、この判断に基づいてCSIのフィードバック処理を行うことを特徴とする。 【選択図】図7
PROBLEM TO BE SOLVED: To provide a radio communication system which reduces a processing load and can suppress a deterioration in a throughput characteristic in the case where a plurality of kinds of CSI processes are set, a base station device, a user terminal, and a radio communication method.SOLUTION: A radio communication method of this invention includes a plurality of base station devices for transmitting CSI-RS for measuring CSI, and a user terminal for communicating with the plurality of base station devices. In the case where a plurality of CSI processes being a combination of SMR and IMR are set, a base station device determines a CSI process for acquiring CSI by using the closest CSI reference resource by tracing back before a sub-frame number N-4, and the user terminal determines the CSI process determined by the base station device, and performs feedback processing of the CSI on the basis of the determination.

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