JP2016529758A - 無線通信システムにおいてチャネル状態情報送信方法及び装置 - Google Patents
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Abstract
Description
以下、MIMOシステムについて説明する。MIMO(Multiple−Input Multiple−Output)は、複数個の送信アンテナと複数個の受信アンテナを使用する方法で、この方法によりデータの送受信効率を向上させることができる。すなわち、無線通信システムの送信端あるいは受信端で複数個のアンテナを使用することによって容量を増大させ、性能を向上させることができる。以下、本文献ではMIMOを「多重アンテナ」と呼ぶこともできる。
以下、チャネル状態情報(channel state information;CSI)報告について説明する。現在、LTE標準では、チャネル状態情報無しで運用される開ループ(open−loop)MIMOとチャネル状態情報に基づいて運用される閉ループ(closed−loop)MIMOといった2種類の送信方式が存在する。特に、閉ループMIMOでは、MIMOアンテナの多重化利得(multiplexing gain)を得るために、基地局及び端末のそれぞれはチャネル状態情報に基づいてビームフォーミングを行うことができる。基地局は、チャネル状態情報を端末から得るために、端末にPUCCH(Physical Uplink Control CHannel)又はPUSCH(Physical Uplink Shared CHannel)を割り当て、下りリンク信号に対するチャネル状態情報(CSI)をフィードバックするように命令する。
本発明に係る第1実施例は、PUCCHフィードバックモード1−1のサブモード1においてコードブックサブサンプリング方法に関する。
本発明に係る第2実施例は、PUCCHフィードバックモード1−1のサブモード2においてコードブックサブサンプリング方法に関する。
第3実施例は、上述した式12乃至式15の4Txコードブックの他の例であり、第3実施例のコードブックを利用する場合にも、上記の第1実施例及び第2実施例を適用することができる。上述した式12乃至式15のコードブックと第3実施例のコードブックは、ランク2においてW2の一部のコードワード(9,10,11,12,13,14,15)が異なるだけで、残りはいずれも同一である。したがって、第3実施例のコードブックを第1実施例又は第2実施例によってサブサンプリングする場合、サブサンプリングされたコードブックは同一である。
図17に、本発明の一実施例に適用可能な基地局及び端末を例示する。
Claims (14)
- 無線通信システムにおいて端末がチャネル状態情報を送信する方法であって、
4アンテナポートのための報告モードにおいて、RIと第1PMIを一つのエンコーディング値に結合エンコーディングするステップと、
前記エンコーディング値を含む前記チャネル状態情報を送信するステップと、
を有し、
前記RIが1である場合、コードブックインデックスは、前記エンコーディング値と同じ値を有し、
前記RIが2である場合、前記コードブックインデックスは、前記エンコーディング値よりも8小さい値を有する、チャネル状態情報送信方法。 - 前記RIが1である場合、前記エンコーディング値は、0〜7の整数のうち一つを有する、請求項1に記載のチャネル状態情報送信方法。
- 前記RIが2である場合、前記エンコーディングは、8〜15の整数のうち一つを有する、請求項1に記載のチャネル状態情報送信方法。
- 前記RIが3である場合、前記エンコーディング値は16を有する、請求項1に記載のチャネル状態情報送信方法。
- 前記RIが4である場合、前記エンコーディング値は17を有する、請求項1に記載のチャネル状態情報送信方法。
- 前記第1PMIは、広帯域長期間のPMIに該当し、狭帯域短期間の第2PMIと共に最終PMIを決定する、請求項1に記載のチャネル状態情報送信方法。
- 前記報告モードは、PMI及び広帯域CQIを報告するPUCCHモード1−1の第1サブモードである、請求項1に記載のチャネル状態情報送信方法。
- 無線通信システムにおいてチャネル状態情報を送信する端末であって、
RFユニットと、
プロセッサと、
を備え、
前記プロセッサは、
4アンテナポートのための報告モードにおいて、前記RIと前記第1PMIを一つのエンコーディング値に結合エンコーディングし、
前記エンコーディング値を含む前記チャネル状態情報を送信するように構成され、
前記RIが1である場合、コードブックインデックスは、前記エンコーディング値と同じ値を有し、
前記RIが2である場合、前記コードブックインデックスは、前記エンコーディング値よりも8小さい値を有する、端末。 - 前記RIが1である場合、前記エンコーディング値は、0〜7の整数のうち一つを有する、請求項8に記載の端末。
- 前記RIが2である場合、前記エンコーディングは、8〜15の整数のうち一つを有する、請求項8に記載の端末。
- 前記RIが3である場合、前記エンコーディング値は16を有する、請求項8に記載の端末。
- 前記RIが4である場合、前記エンコーディング値は17を有する、請求項8に記載の端末。
- 前記第1PMIは、広帯域長期間のPMIに該当し、狭帯域短期間の第2PMIと共に最終PMIを決定する、請求項8に記載の端末。
- 前記報告モードは、PMI及び広帯域CQIを報告するPUCCHモード1−1の第1サブモードである、請求項8に記載の端末。
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