JP2019532544A - 無線通信システムにおけるチャンネル状態報告のための方法及びその装置 - Google Patents
無線通信システムにおけるチャンネル状態報告のための方法及びその装置 Download PDFInfo
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Abstract
Description
個の副搬送波(subcarrier)と
個のOFDMシンボルとで構成されるリソース格子(resource grid)と表現することができる。ここで、
は、下りリンクスロットにおけるリソースブロック(resource block,RB)の個数を表し、
は、ULスロットにおけるRBの個数を表す。
と
は、DL送信帯域幅とUL送信帯域幅にそれぞれ依存する。
は、下りリンクスロットにおけるOFDMシンボルの個数を表し、
は、ULスロットにおけるOFDMシンボルの個数を表す。
は、1つのRBを構成する副搬送波の個数を表す。
個の副搬送波を含む。副搬送波の類型は、データ送信のためのデータ副搬送波、参照信号(reference signal)の送信のための参照信号副搬送波、ガードバンド(guard band)及び直流(Direct Current,DC)成分のためのヌル(null)副搬送波に分類することができる。DC成分のためのヌル副搬送波は、未使用のまま残される副搬送波であり、OFDM信号生成過程或いは周波数上り変換過程で搬送波周波数(carrier frequency,f0)にマッピング(mapping)される。搬送波周波数は中心周波数(center frequency)と呼ばれることもある。
個(例えば、7個)の連続するOFDMシンボルと定義され、周波数ドメインで
個(例えば、12個)の連続する副搬送波と定義される。参考として、1つのOFDMシンボルと1つの副搬送波で構成されたリソースをリソース要素(resource element,RE)或いはトーン(tone)という。したがって、1つのRBは、
個のリソース要素で構成される。リソース格子における各リソース要素は、1つのスロットにおけるインデックス対(k,1)によって固有に定義できる。kは、周波数ドメインで0から
まで与えられるインデックスであり、lは、時間ドメインで0から
まで与えられるインデックスである。
個の連続した同一副搬送波を占有しながら、当該サブフレームにおける2個のスロットのそれぞれに1個ずつ位置する2個のRBを物理リソースブロック(physical resource block,PRB)対(pair)という。PRB対を構成する2個のRBは、同一のPRB番号(或いは、PRBインデックス(index)ともいう)を有する。VRBは、リソース割り当てのために導入された一種の論理的リソース割り当て単位である。VRBはPRBと同じサイズを有する。VRBをPRBにマッピングする方式によって、VRBは、局部(localized)タイプのVRBと分散(distributed)タイプのVRBとに区別される。局部タイプのVRBはPRBに直接マッピングされて、VRB番号(VRBインデックスともいう)がPRB番号に直接対応する。すなわち、nPRB=nVRBとなる。局部タイプのVRBには0から
順に番号が与えられ、
である。したがって、局部マッピング方式によれば、同一のVRB番号を有するVRBが1番目のスロットと2番目のスロットにおいて、同一PRB番号のPRBにマッピングされる。一方、分散タイプのVRBはインターリービングを経てPRBにマッピングされる。そのため、同一のVRB番号を有する分散タイプのVRBは、1番目のスロットと2番目のスロットにおいて互いに異なる番号のPRBにマッピングされることがある。サブフレームの2つのスロットに1個ずつ位置し、同一のVRB番号を有する2個のPRBをVRB対と称する。
Claims (14)
- 無線通信システムにおいて、チャンネル状態情報−参照信号(channel state information−reference signal;CSI−RS)ベースのチャンネル状態報告方法であって、
単一ニューマロロジー(numerology)で設定された周波数帯域を占める部分帯域に対するCSI−RS設定を受信するステップであって、前記CSI−RS設定に複数の部分帯域に対するCSI−RS設定が含まれる場合、前記複数の部分帯域のそれぞれは互いに異なるニューマロロジーで設定されるステップと、
前記部分帯域に対するCSI−RS設定に従って、前記部分帯域で送信されるCSI−RSから導出されたCSI情報を送信するステップを含むことを特徴とするチャンネル状態報告方法。 - 前記部分帯域に対するCSI−RS設定は、帯域幅情報又は周波数位置に関する情報を含むことを特徴とする、請求項1に記載のチャンネル状態報告方法。
- 前記複数の部分帯域のそれぞれは、1つの送信ブロック(transport block)が送信される周波数帯域であることを特徴とする、請求項1に記載のチャンネル状態報告方法。
- 前記CSI−RS設定に複数の部分帯域に対するCSI−RS設定が含まれる場合、前記複数の部分帯域のうち少なくとも一部は互いに重なることを特徴とする、請求項1に記載のチャンネル状態報告方法。
- 前記複数の部分帯域のうち少なくとも一部は、互いに時間分割多重化(time division mupltiplexing)されることを特徴とする、請求項4に記載のチャンネル状態報告方法。
- 前記送信されるCSI情報は、前記複数の部分帯域のそれぞれにおいて独立して導出されたCSIを含むことを特徴とする、請求項1に記載のチャンネル状態報告方法。
- 前記部分帯域に対するCSI−RS設定は、上位層シグナリングを介して受信されることを特徴とする、請求項1に記載のチャンネル状態報告方法。
- 無線通信システムにおいて、チャンネル状態情報−参照信号(channel state information−reference signal;CSI−RS)ベースのチャンネル状態報告を行う端末であって、
送信機と、受信機と、
前記送信機及び受信機を制御するように構成されたプロセッサーを含み、
前記プロセッサーは、
単一ニューマロロジー(numerology)で設定された周波数帯域を占める部分帯域に対するCSI−RS設定を受信して、前記CSI−RS設定に複数の部分帯域に対するCSI−RS設定が含まれる場合、前記複数の部分帯域のそれぞれは互いに異なるニューマロロジーで設定され、
前記部分帯域に対するCSI−RS設定に従って、前記部分帯域で送信されるCSI−RSから導出されたCSI情報を送信するように構成されることを特徴とする、端末。 - 前記部分帯域に対するCSI−RS設定は、帯域幅情報又は周波数位置に関する情報を含むことを特徴とする、請求項8に記載の端末。
- 前記複数の部分帯域のそれぞれは、1つの送信ブロック(transport block)が送信される周波数帯域であることを特徴とする、請求項8に記載の端末。
- 前記CSI−RS設定に複数の部分帯域に対するCSI−RS設定が含まれる場合、前記複数の部分帯域のうち少なくとも一部は互いに重なることを特徴とする、請求項8に記載の端末。
- 前記複数の部分帯域のうち少なくとも一部は、互いに時間分割多重化(time division mupltiplexing)されることを特徴とする、請求項11に記載の端末。
- 前記送信されるCSI情報は、前記複数の部分帯域のそれぞれにおいて独立して導出されたCSIを含むことを特徴とする、請求項8に記載の端末。
- 前記部分帯域に対するCSI−RS設定は、上位層シグナリングを介して受信されることを特徴とする、請求項8に記載の端末。
Applications Claiming Priority (9)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US201662373978P | 2016-08-11 | 2016-08-11 | |
US62/373,978 | 2016-08-11 | ||
US201662416673P | 2016-11-02 | 2016-11-02 | |
US62/416,673 | 2016-11-02 | ||
US201762469489P | 2017-03-09 | 2017-03-09 | |
US62/469,489 | 2017-03-09 | ||
US201762481133P | 2017-04-04 | 2017-04-04 | |
US62/481,133 | 2017-04-04 | ||
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JP7057347B2 (ja) | 2022-04-19 |
US11006303B2 (en) | 2021-05-11 |
KR20180072823A (ko) | 2018-06-29 |
KR102108077B1 (ko) | 2020-05-08 |
WO2018030804A1 (ko) | 2018-02-15 |
CN109644033B (zh) | 2022-04-15 |
EP3471287A1 (en) | 2019-04-17 |
KR101988324B1 (ko) | 2019-06-12 |
US20190342782A1 (en) | 2019-11-07 |
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