JP2020099063A - 非免許帯域をサポートする無線接続システムにおいてチャネル状態情報を報告する方法及びこれをサポートする装置 - Google Patents
非免許帯域をサポートする無線接続システムにおいてチャネル状態情報を報告する方法及びこれをサポートする装置 Download PDFInfo
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- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
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Abstract
Description
の長さを有し、
の均等な長さを有し、0から19までのインデックスが与えられた20個のスロットで構成される。1サブフレームは、2個の連続したスロットと定義され、i番目のサブフレームは、2i及び2i+1に該当するスロットで構成される。すなわち、無線フレーム(radio frame)は、10個のサブフレーム(subframe)で構成される。1サブフレームを送信するのにかかる時間をTTI(transmission time interval)という。ここで、Tsはサンプリング時間を表し、Ts=1/(15kHz×2048)=3.2552×10−8(約33ns)と表示される。スロットは、時間領域で複数のOFDMシンボル又はSC−FDMAシンボルを含み、周波数領域で複数のリソースブロック(Resource Block)を含む。
の長さを有し、
の長さを有する2個のハーフフレーム(half−frame)で構成される。各ハーフフレームは、
の長さを有する5個のサブフレームで構成される。i番目のサブフレームは、2i及び2i+1に該当する各
の長さを有する2個のスロットで構成される。ここで、Tsは、サンプリング時間を表し、Ts=1/(15kHz×2048)=3.2552×10−8(約33ns)で表示される。
とすれば、システムで利用可能なCCEの個数は
であり、各CCEは0から
までのインデックスを有する。
を満たすCCEから始まってもよい。
(2)送信モード2:送信ダイバーシティ(Transmit Diversity)
(3)送信モード3:開ループ空間多重化(Open−loop Spatial Multiplexing)
(4)送信モード4:閉ループ空間多重化(Closed−loop Spatial Multiplexing)
(5)送信モード5:多重ユーザMIMO
(6)送信モード6:閉ループランク=1プリコーディング
(7)送信モード7:コードブックに基づかない、単一レイヤ送信をサポートするプリコーディング
(8)送信モード8:コードブックに基づかない、2個までのレイヤをサポートするプリコーディング
(9)送信モード9:コードブックに基づかない、8個までのレイヤをサポートするプリコーディング
(10)送信モード10:コードブックに基づかない、CoMPのために用いられる、8個までのレイヤをサポートするプリコーディング
を有する複数のCCEで構成される。ここで、
は、k番目のサブフレームの制御領域内におけるCCEの総数を意味する。端末は、サブフレームごとに複数のPDCCHをモニタする。ここで、モニタリングとは、端末がモニタされるPDCCHフォーマットによってPDCCHのそれぞれのデコーディングを試みることをいう。
は、集合レベル
によるPDCCH候補セットを意味する。サーチスペースのPDCCH候補セット
によるCCEは、次式1によって決定することができる。
は、サーチスペースでモニタするためのCCE集合レベルLによるPDCCH候補の個数を表し、
である。
は、PDCCHにおいて各PDCCH候補で個別CCEを指定するインデックスであり、
である。
であり、
は、無線フレーム内でのスロットインデックスを表す。
は0に設定される。一方、端末特定サーチスペースの場合、集合レベルLに対して
は式2のように定義される。
であり、
はRNTI値を表す。また、
であり、
である。
値を示す。この際、実際の値(Actual Value)は
値*2[dB]に設定される。また、PMI−RIレポートIEはPMI/IR報告が構成されるか否かを示す。EUTRANは伝送モードがTM8、9又は10に設定された場合にのみPMI−RIレポートIEを構成する。
Claims (12)
- 非免許帯域をサポートする無線接続システムにおいてUE(user equipment)がCSI(channel state information)を報告する方法であって、
前記非免許帯域内に設定された非免許帯域セル内で下りリンクバーストを受信する段階と、
前記下りリンクバーストに基づいて前記CSIを測定する段階と、
前記測定されたCSIを報告する段階と、を含み、
前記下りリンクバーストは、少なくとも第1のTTI(transmission time interval)及び第2のTTIにおいて受信され、
前記第1のTTIは、OFDM(orthogonal frequency divisional multiplexing)シンボルの第1の個数として設定され、
前記第2のTTIは、OFDMシンボルの第2の個数として設定され、
前記第1の個数は、前記第2の個数より少なく、
前記第1のTTIは、前記CSIのための有効でない時間リソースであるとみなされる、方法。 - 前記第1のTTIは、セルフキャリアスケジューリングでスケジュールされ、
前記第2のTTIは、クロスキャリアスケジューリングでスケジュールされる、請求項1に記載の方法。 - 前記CSIを報告するための要求を免許帯域セル内で受信する段階をさらに含み、
前記測定されたCSIを送信する段階は、前記要求に応答して、前記測定されたCSIを前記免許帯域セル内で送信する段階を含む、請求項1又は2に記載の方法。 - 前記CSIを報告するための要求を前記非免許帯域セル内で受信する段階をさらに含み、
前記測定されたCSIを送信する段階は、前記要求に応答して、前記測定されたCSIを前記非免許帯域セル内で送信する段階を含む、請求項1又は2に記載の方法。 - 前記測定されたCSIを送信する段階は、前記測定されたCSIを周期的に免許帯域セル内で送信する段階を含む、請求項1〜4のいずれか一項に記載の方法。
- 前記有効でない時間リソースは、前記CSIのための参照リソースが割り当てられない時間リソースを意味する、請求項1〜5のいずれか一項に記載の方法。
- 非免許帯域をサポートする無線接続システムにおいてCSI(channel state information)を報告するUE(user equipment)であって、
メモリと、
前記メモリと連結された少なくとも一つのプロセッサと、を含み、
前記少なくとも一つのプロセッサは、
前記非免許帯域内に設定された非免許帯域セル内で下りリンクバーストを受信し、
前記下りリンクバーストに基づいて前記CSIを測定し、
前記測定されたCSIを報告する、
ように設定され、
前記下りリンクバーストは、少なくとも第1のTTI(transmission time interval)及び第2のTTIにおいて受信され、
前記第1のTTIは、OFDM(orthogonal frequency divisional multiplexing)シンボルの第1の個数として設定され、
前記第2のTTIは、OFDMシンボルの第2の個数として設定され、
前記第1の個数は、前記第2の個数より少なく、
前記第1のTTIは、前記CSIのための有効でない時間リソースであるとみなされる、UE。 - 前記第1のTTIは、セルフキャリアスケジューリングでスケジュールされ、
前記第2のTTIは、クロスキャリアスケジューリングでスケジュールされる、請求項7に記載のUE。 - 前記少なくとも一つのプロセッサは、
前記CSIを報告するための要求を免許帯域セル内で受信し、
前記要求に応答して、前記測定されたCSIを前記免許帯域セル内で送信する、
ようにさらに設定される、請求項7又は8に記載のUE。 - 前記少なくとも一つのプロセッサは、
前記CSIを報告するための要求を前記非免許帯域セル内で受信し、
前記要求に応答して、前記測定されたCSIを前記非免許帯域セル内で送信する、
ようにさらに設定される、請求項7又は8に記載のUE。 - 前記少なくとも一つのプロセッサは、前記測定されたCSIを周期的に免許帯域セル内で送信するようにさらに設定される、請求項7〜10のいずれか一項に記載のUE。
- 前記有効でない時間リソースは、前記CSIのための参照リソースが割り当てられない時間リソースを意味する、請求項7〜11のいずれか一項に記載のUE。
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