JP2019004482A - 無線セルラシステムにおけるセル間多重化利得の利用 - Google Patents
無線セルラシステムにおけるセル間多重化利得の利用 Download PDFInfo
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- H04B7/0619—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 using feedback from receiving side
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Abstract
Description
本出願は、2012年11月26日出願の「Systems And Methods For Exploiting Inter−Cell Multiplexing Gain In Wireless Cellular Systems Via Distributed Input Distributed Output Technology」と題する同時係属中の米国仮出願番号第61/729,990号の利益を主張する。この仮出願は、本出願の譲受人に譲渡されている。この出願は、その全体が本明細書に参照により組み込まれる。
本出願は、以下の同時係属中の米国特許出願に関連があり得る。
米国特許出願第13/233,006号、表題「System and Methods for planned evolution and obsolescence of multiuser spectrum」。
・モード1:単一アンテナ・ポート、ポート0
・モード2:送信ダイバーシティ
・モード3:大遅延巡回遅延ダイバーシティ(CDD)、シングルユーザMIMO(SU−MIMO)に関する開ループ空間多重化の拡張
・モード4:SU−MIMOに関する閉ループ空間多重化
・モード5:複数ユーザMIMO(MU−MIMO)
・モード6:閉ループ空間多重化、単一の送信レイヤ使用
・モード7:単一アンテナ・ポート、UE固有RS(ポート5)
・モード8:シングル又はデュアルレイヤ送信、UE固有RS(ポート7及び/又は8)
・モード9:単一又は最大8層までの閉ループSU−MIMO(リリース10で追加) ・モード10:8層までのマルチレイヤ閉ループSU−MIMO(リリース10で追加)
イントラセルダイバーシティ方法は、1つのセルの中で動作し、劣悪なリンク品質(例えば、中央塔又は基地局からの高い経路損失を受けるセル端のユーザ)を有するシナリオにおいてSNRを増強するようになっている。MIMO通信において使用される代表的なダイバーシティ方式は、ビームフォーミング[5〜11]及び直交空間時間ブロックコード(OSTBC)[12〜15]である。
MIMO多重化方式[1、19]は、無線リンク上の複数の並列データストリームをサポートするために、高いSNRレジームにおいて、及び、チャネルにおける十分な空間自由度を有するシナリオ(例えば、高い空間選択性[16〜18]を有する豊かなマルチパスの環境)において、データレートの利得を提供する。
インターセル伝送技術は、BTS間の協調がワイヤレスネットワークの性能を改善することを可能にする。これらの技術は、同時に全員が同じ周波数を使用している多重UEのための分散アンテナネットワークの一般的なケースにおいて、無線送受信機間の協調を可能にするために関連特許及び出願[0002〜0020]で教示される方法の特例である。所定の周波数及び所定の時刻における単一のUEに関するセルラシステムの特定のケースについて、セル間干渉を除去するBTS間の協調について[53]で記載した。[53]におけるシステムは、あらゆるマクロセルを複数のサブセルに分割し、協調したBTSからの専用のビームフォーミングを使用することによって、サブセル間の柔軟なハンドオフを可能にする。そして、協調したBTSからの専用のビームフォーミングを使用することによって、単一のUEがサブセルの境界に沿って移動するときに、単一の周波数及び単一のUEにおけるリンクの堅牢性を改善する。
先行技術の複数ユーザ無線システムは、無線ネットワークに複雑さを追加し、制約を導入し、結果として、その領域における別のユーザによるスペクトルの利用によって、所定のユーザの経験(例えば利用可能なスループット、遅延、予測性、信頼性)が影響を受ける状況になる。複数ユーザと共有する無線スペクトル内のスループットの総計に対する増加する要求、並びに、所定のユーザに関する複数ユーザ無線ネットワークの信頼性、予測性及び低遅延に依存することができるアプリケーションの成長の増加を考慮すると、先行技術の複数ユーザ無線技術が多くの制約を被ることは明らかである。確かに、特定の種類の無線通信(例えば、建物の壁を貫通するのに有効な波長における)に適切なスペクトルの制限された可用性に関して、先行技術の無線技術は、信頼性が高く予測可能で低遅延である帯域幅に対する増加する要求に応ずるには不十分であろう。
・ユーザ機器(UE)1〜4:固定又はモバイルクライアント用のRFトランシーバであって、DIDOバックホールからのダウンリンク(DL)チャネル上でデータストリームを受信し、アップリンク(UL)チャネルを介してDIDOバックホールへデータを送信する。
・送受信基地局(BTS)903:BTSは、DIDOバックホールを無線チャネルに接続する。一実施形態のBTSは、DAC/ADC及びベースバンド信号をRFに変換する無線周波数(RF)チェーンから成るアクセスポイントである。場合によっては、BTSは、電力増幅器/アンテナを備える簡素なRFトランシーバであり、RF信号は、関連特許及び出願に記載されたRFオーバーファイバ技術によって、BTSへ運ばれる。
・コントローラ(CTR)905:CTR 905は、下記の特定の特殊な機能のために設計されたBTSの1つの特定のタイプである。その機能とは、BTS及び/又はUEの時間/周波数同期用のトレーニング信号を送信すること、制御情報をUEから受信し、UEへ送信すること、そして、UEからチャネル状態情報(CSI)又はチャネル品質情報を受信することである。一つ以上のCTR局は、任意のDIDOシステムに含めることができる。複数のCTRが利用可能であるとき、それらの局への、又はそれらからの情報はダイバーシティを増大して、リンク品質を改善するために組み合わせることができる。一実施形態において、CSI復調を改善する最大比合成(MRC)技術によって、CSIは複数のCTRから受信される。別の実施形態では、制御情報は、受信機側におけるSNRを改善するために、最大比伝送(MRT)によって複数のCTRから送信される。発明の範囲は、MRC又はMRTに限られておらず、CTRとUEの間の無線リンクを改善するために、任意の他のダイバーシティ技術(例えばアンテナ選択等)を使用することができる。
・集中型プロセッサ(CP)901:CPは、DIDOバックホールとインターネット又は別の種類の外部ネットワークを接続するDIDOサーバである。一実施形態において、CPはDIDOベースバンド処理を計算して、DL伝送により、分散したBTSに波形を送信する。
・基地局ネットワーク(BSN)902:BSNは、DL又はULチャネルのいずれについて情報を運ぶ分散したBTSにCPを接続するネットワークである。BSNは、有線若しくは無線ネットワーク、又は双方の組合せである。例えば、BSNはDSL、ケーブル、光ファイバーネットワーク、又は見通し内(LOS)若しくは見通し外(NLO)無線リンクである。更に、BSNは固有ネットワーク、又はローカルエリアネットワーク、又はインターネットである。
・GW(ゲートウェイ)501〜502:LTEネットワークを外部ネットワーク(すなわち、インターネット)に接続するルータである。GWは、E−UTRANインターフェースの境界をなすサービングゲートウェイ(S−GW)502及び外部ネットワークとのインターフェースであるPDNゲートウェイ(P−GW)501に分けられる。S−GW 502及びP−GW 501は、いわゆる進化型パケットコア(EPC)の一部である。
・MME(モビリティ管理エンティティ)503:移動性、保護パラメーター及びUEアイデンティティを管理する。MME 503は、更にLTE EPCの一部である。
・eNodeB(強化されたNode−B)504:無線リソース管理、ユーザ移動性とスケジューリングを取り扱う基地局である。
・UE(ユーザ機器)505:移動局である。
DIDO閉ループ方式は、時分割複信(TDD)又は周波数分割複信(FDD)システムのいずれでも使うことができる。FDDシステムでは、DL及びULチャネルは、異なる周波数で動作する。したがって、DLチャネル状態情報(CSI)は、UE側において推定しなければならず、ULチャネルにより、BTS又はCTRを介して、CPに折り返して報告しなければならない。TDDシステムにおいて、DL及びULチャネルは、同じ周波数で設定し、システムは、チャネル相互性を利用して、閉ループ技術又は開ループ方式のいずれを使用してもよい(以下の節で記載するように)。閉ループ方式の主要な短所は、それらがフィードバックを必要とするということであり、これによって、UL上の制御情報について、より大きなオーバーヘッドをもたらす。
LTE規格は、閉ループ方式のDLシグナリングについて使用することができる2種類の参照信号(RS)を定める[33、50、82〜83]。i)セル固有の参照信号(CRS)。ii)チャネル状態情報(CSI)参照信号(CSI−RS)、及び復調RS(DM−RS)などのUE固有のRS。セル固有のRSはプリコーディングされないが、UE固有のRSはプリコーディングされる[50]。CRSは、どのセルも最大4つのアンテナを使用する、SU/MU−MIMOコードブックに基づく技術を用いるLTEリリース8に使用される。LTE−Advancedリリース10は、非コードブックに基づくSU/MU−MIMO方式をサポートし、最大8つの送信アンテナ並びにCoMP方式を使用し、アンテナは異なるセル上に分散されている。したがって、リリース10はCSI−RSによる柔軟なシグナリング方式を可能にする。本発明において、プリコーディングを可能にするために、DIDOシステムにおいて、シグナリング方式のいずれのタイプをどのように使用することができるのかを記載する。
CRSは、UEにおけるすべての送信アンテナからBTSへのCSIを推定するために、LTE(リリース8)システムで使用される[80、84]。CRSは、二次元の直交シーケンスと二次元の疑似乱数(PRN)シーケンスの積として得られる。合計510の異なるCRSシーケンスについて、3つの直交及び170の可能なPRNシーケンスがある。どのシーケンスも、1つのセルを一意的に特定する。CRSは、すべてのスロットの第1及び最後から3番目のOFDMシンボル、並びに6番目ごとのサブキャリアの中で送信される。時間と周波数の直交パターンは、UEが4つのアンテナの各々からのCSIを一意的に推定するために、BTSのあらゆる送信アンテナに関して設計される。時間及び周波数において(つまり、すべての0.5ミリ秒のスロットごと、及び第6のサブキャリアごとに送信)この高密度のCRSは、5%のオーバーヘッドを生成し、時間及び周波数について高速チャネル変動を伴うシナリオをサポートするために意図的に設計されたものである[83]。
LTE−Advanced(リリース10)規格に、CSI−RSは、BTSからのCSIを推定するために、あらゆるUEによって使用される[33、83]。規格はBTSにおける異なる送信器のための直交CSI−RSを定めることにより、UEは異なるBTSからのCSIを区別することができる。BTSにおける最大で8つの送信アンテナは、[33]の表6.10.5.2−1、2のように、CSI−RSによってサポートされる。CSI−RSは、[33]の表6.10.5.3−1のように、5〜80のサブフレームにわたる周期性(即ち、CSI−RSは、5〜80ミリ秒ごとに送信される)をもって送信される。LTE−AdvancedのCSI−RSの周期性は、制御情報の過度のオーバーヘッドを避けるために、特にこれらの余分のリソースを使用することができない従来のLTE端末に関して、LTEのCRSより故意に大きく設計された。CSI推定のために使用される別の参照信号は復調RS(DM−RS)である。DM−RSは、固有のUEに意図された復調参照信号であり、そのUEへの送信のために割り当てられたリソースブロックの中に入れて、送信されるだけである。
LTE及びLTE−Advanced規格では、UEは、その現行のチャネル状況並びにDLチャネル上の閉ループ送信に関するプリコーディング重みを通信するために、BTSへ情報をフィードバックする。3つの異なるチャネル指標がそれらの規格に含まれる[35]。
・ランク指標(RI):いくつの空間ストリームが所定のUEへ送信されるかについて示す。この数は、常に、送信アンテナの数と等しいか又は少ない。
・プリコーディングマトリックス指標(PMI):DLチャネル上のプリコーディングに使用されるコードブックのインデックス。
・チャネル品質指標(CQI):DL上で使用される変調、及び、所定のチャネル状況に関する定義済み誤り率性能を維持するために、前方向誤り訂正(FEC)符号方式を定める。
DIDO開ループ方式は、チャネル相互性を利用する時分割複信(TDD)システムで、使用することができるだけである。DIDOシステムにおける開ループ方式に関する仕組みの一実施形態は、以下の通りである。i)UE 1〜4は、UL上で、BTS 903又はCTR 905へシグナリング情報を送信する。ii)BTS 903又はCTR 905は、すべてのUE 1〜4からのUL CSIを推定するために、そのシグナリング情報を利用する。iii)BTS 903又はCTR 905は、UL CSIをDL CSIに変換するために、RF補正を使用する。iv)BTS 903又はCTR 905は、BSN 902を通してDL CSI又はコードブックインデックスをCPへ送信する。v)そのDL CSIに基づいてCP 901はDL上のデータ伝送に関するプリコーディング重みを計算する。閉ループDIDO方式と同様に、ユーザクラスタは、BTSにおいて推定されるUEからのCSIの量を低減するために使用することができ、それによって、BTSにおける計算の負担、並びに、UL上で必要とされるシグナリングの量を低減する。本発明の一実施形態では、開ループプリコーディング技術は、DLチャネル上で、BTSからUEへ同時非干渉データストリームを送信するために使用される。
本発明の実施形態は、すべてのUEからBTSへの同時ULデータストリームを受信するために、ULチャネル上で開ループMU−MIMO方式を使用する。UL開ループMU−MIMO方式の一実施形態は、以下のステップを含む。i)UE 1〜4は、すべてのBTS 903へシグナリング情報及びデータペイロードを送信する。ii)BTS 903は、シグナリング情報を使用して、すべてのUEからのチャネル推定を計算する。iii)BTS 903はチャネル推定及びデータペイロードをCP 901へ送信する。iv)CP 901は、空間フィルタリングによって、すべてのUEのデータペイロードからチャンネル間干渉を除去するために、チャネル推定を使用し、すべてのUEからデータストリームを復調する。一実施形態において、開ループMU−MIMOシステムは、UEからBTSへのULチャネルの数を増大するために、単一キャリアの周波数分割多元接続(SC−FDMA)を使用し、周波数領域でそれらを多重化する。
アメリカ合衆国及び世界の他の領域で、LTEネットワークは、すでに稼働中であるか又は、配備されるところであるか、及び/又は配備されることになっている。もし、LTEオペレータがDIDO能力を既存の又はすでに約束された配備の中へ、徐々に配備することができるならば、彼らにとって著しい利益となるであろう。このように、彼らは、DIDOが最も即時の利益を提供する領域に、DIDOを配備することができ、徐々に、より多くのネットワークにわたるようにDIDO能力を拡大する。やがて、彼らが領域に十分なDIDOカバレージを有したら、それらは、完全にセルの使用を廃止することを選び、その代わりに、DIDOへ完全に切り替えて、非常な低コストで非常により高いスペクトル密度を実現することができる。セルラからDIDOへのこの完全な移行を通して、LTEオペレータの無線カスタマーは、サービスで損失を被るようなことは決してないであろう。むしろ、彼らはそれらのデータ効率及び信頼性の改善に単に遭遇するだけであり、一方、操作者はそのコスト低下に遭遇することになる。
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Claims (28)
- 複数ユーザ(MU)送信を有する複数アンテナシステム(MAS)(「MU−MAS」)を含むシステムであって、
前記複数アンテナシステムは、
複数の無線ユーザ装置と、
前記無線ユーザ装置と通信可能なように接続され、前記無線ユーザ装置の位置においてオーバーラップするカバレッジを有する複数の無線送受信装置または協調する分散アンテナと、
同じ周波数バンド内のユーザ装置と複数の同時非干渉ダウンリンクまたはアップリンクデータリンクを形成するためにセル間干渉を実行する空間処理を用いる空間処理手段と、を備え、
前記分散アンテナから送信される電力は、任意の特定の電力レベルに制約されることがなく、前記セル全体にわたる意図的なセル間干渉を生じさせる結果となり、前記セル間干渉が前記無線通信ネットワークの容量を増加させるように実行される、ことを特徴とするシステム。 - 複数ユーザ(MU)送信を有する複数アンテナシステム(MAS)(「MU−MAS」)を含むシステムであって、
前記複数アンテナシステムは、
複数の無線ユーザ装置と、
前記無線ユーザ装置と通信可能なように接続され、前記無線ユーザ装置の位置においてオーバーラップするカバレッジを有する複数の無線送受信装置または協調する分散アンテナと、
同じ周波数バンド内のユーザ装置と複数の同時非干渉ダウンリンクまたはアップリンクデータリンクを形成するためにセル間干渉を実行する空間処理を用いる空間処理手段と、を備え、
前記無線通信ネットワークがロングタームエボリューション(LTE)ネットワークのようなセルラネットワークであり、
閉ループプリコーディング方法が、ダウンリンク(DL)チャネルを超えて送受信基地局(BTS)からユーザ機器(UE)に同時非干渉データリンクストリームを送信するように用いられ、そして、
すべてのユーザ機器(UE)はセル固有の参照信号(CRS)を用いてすべての送受信基地局(BTS)または、その固有のユーザクラスタ内の送受信基地局(BTS)のみからチャネル状態情報(CSI)を推定し、該ユーザクラスタは、前記ユーザ機器(UE)の位置から届く前記送受信基地局(BTS)の組として画定される、ことを特徴とするシステム。 - 集中型プロセッサ(CP)が前記ダウンリンク(DL)チャネルの時間と周波数選択性を推定し、異なる送受信基地局(BTS)に対する前記セル固有の参照信号(CRS)を異なるリソースエレメントに動的に再配分する、ことを特徴とする請求項2に記載のシステム。
- 複数ユーザ(MU)送信を有する複数アンテナシステム(MAS)(「MU−MAS」)を含むシステムであって、
前記複数アンテナシステムは、
複数の無線ユーザ装置と、
前記無線ユーザ装置と通信可能なように接続され、前記無線ユーザ装置の位置においてオーバーラップするカバレッジを有する複数の無線送受信装置または協調する分散アンテナと、
同じ周波数バンド内のユーザ装置と複数の同時非干渉ダウンリンクまたはアップリンクデータリンクを形成するためにセル間干渉を実行する空間処理を用いる空間処理手段と、を備え、
前記無線通信ネットワークがロングタームエボリューション(LTE)ネットワークのようなセルラネットワークであり、
閉ループプリコーディング方法が、ダウンリンク(DL)チャネルを超えて送受信基地局(BTS)からユーザ機器(UE)に同時非干渉データリンクストリームを送信するように用いられ、そして、
すべてのユーザ機器(UE)はチャネル状態情報参照信号(CSI−RS)または、復調参照信号(DM−RS)、またはその両方の組み合わせを用いて、すべての送受信基地局(BTS)または、その固有のユーザクラスタ内の送受信基地局(BTS)のみからチャネル状態情報(CSI)を推定する、ことを特徴とするシステム。 - ロングタームエボリューション(LTE)規格のチャネル状態情報参照信号(CSI−RS)方式によって支持されるアンテナの最大数より少ない前記ユーザクラスタ内の送受信基地局(BTS)の数を減らすように、前記送受信基地局(BTS)からの送信電力が低減されている、ことを特徴とする請求項4に記載のシステム。
- 前記ユーザクラスタ内の前記送受信基地局(BTS)がサブセットに分割され、前記チャネル状態情報参照信号(CSI−RS)が所定の間隔で一度に送受信基地局(BTS)の1つのサブセットから送信される、ことを特徴とする請求項4に記載のシステム。
- 異なるサブセットのための前記チャネル状態情報参照信号(CSI−RS)の前記間隔が、前記ロングタームエボリューション(LTE)規格によって支持された前記間隔の値及び前記ユーザ機器(UE)のチャネルコヒーレンス時間に基づいて決定ささる、ことを特徴とする請求項6に記載のシステム。
- 前記ロングタームエボリューション(LTE)規格とは異なるパターン及び間隔が前記チャネル状態情報参照信号(CSI−RS)に対して許容されてシステムの送受信基地局(BTS)のより多くの数を可能にする、ことを特徴とする請求項4に記載のシステム。
- 複数ユーザ(MU)送信を有する複数アンテナシステム(MAS)(「MU−MAS」)を含むシステムであって、
前記複数アンテナシステムは、
複数の無線ユーザ装置と、
前記無線ユーザ装置と通信可能なように接続され、前記無線ユーザ装置の位置においてオーバーラップするカバレッジを有する複数の無線送受信装置または協調する分散アンテナと、
同じ周波数バンド内のユーザ装置と複数の同時非干渉ダウンリンクまたはアップリンクデータリンクを形成するためにセル間干渉を実行する空間処理を用いる空間処理手段と、を備え、
前記無線通信ネットワークがロングタームエボリューション(LTE)ネットワークのようなセルラネットワークであり、
閉ループプリコーディング方法が、ダウンリンク(DL)チャネルを超えて送受信基地局(BTS)からユーザ機器(UE)に同時非干渉データリンクストリームを送信するように用いられ、そして、
前記ユーザ機器(UE)は、物理アップリンク制御チャネル(PUCCH)を介してランク指標(RI)、プリコーディングマトリックス指標(PMI)、チャネル品質指標(CQI)を前記集中型プロセッサ(CP)に報告する、ことを特徴とするシステム。 - 複数ユーザ(MU)送信を有する複数アンテナシステム(MAS)(「MU−MAS」)を含むシステムであって、
前記複数アンテナシステムは、
複数の無線ユーザ装置と、
前記無線ユーザ装置と通信可能なように接続され、前記無線ユーザ装置の位置においてオーバーラップするカバレッジを有する複数の無線送受信装置または協調する分散アンテナと、
同じ周波数バンド内のユーザ装置と複数の同時非干渉ダウンリンクまたはアップリンクデータリンクを形成するためにセル間干渉を実行する空間処理を用いる空間処理手段と、を備え、
前記無線通信ネットワークがロングタームエボリューション(LTE)ネットワークのようなセルラネットワークであり、
閉ループプリコーディング方法が、ダウンリンク(DL)チャネルを超えて送受信基地局(BTS)からユーザ機器(UE)に同時非干渉データリンクストリームを送信するように用いられ、そして、
前記ユーザ機器(UE)は、物理アップリンク共有チャネル(PUSCH)を介してランク指標(RI)、プリコーディングマトリックス指標(PMI)、チャネル品質指標(CQI)を前記集中型プロセッサ(CP)に報告する、ことを特徴とするシステム。 - 前記システムがチャネル周波数選択性を推定し、前記プリコーディングマトリックス指標(PMI)を動的に調整して同じ利用可能なアップリンク(UL)リソースのためのより多数の送受信基地局(BTS)を支持する、ことを特徴とする請求項10に記載のシステム。
- 複数ユーザ(MU)送信を有する複数アンテナシステム(MAS)(「MU−MAS」)を含むシステムであって、
前記複数アンテナシステムは、
複数の無線ユーザ装置と、
前記無線ユーザ装置と通信可能なように接続され、前記無線ユーザ装置の位置においてオーバーラップするカバレッジを有する複数の無線送受信装置または協調する分散アンテナと、
同じ周波数バンド内のユーザ装置と複数の同時非干渉ダウンリンクまたはアップリンクデータリンクを形成するためにセル間干渉を実行する空間処理を用いる空間処理手段と、を備え、
前記無線通信ネットワークがロングタームエボリューション(LTE)ネットワークのようなセルラネットワークであり、
開ループプリコーディング方法が、ダウンリンク(DL)チャネルを超えて送受信基地局(BTS)からユーザ機器(UE)に同時非干渉データリンクストリームを送信するように用いられる、ことを特徴とするシステム。 - 複数ユーザ(MU)送信を有する複数アンテナシステム(MAS)(「MU−MAS」)を含むシステムであって、
前記複数アンテナシステムは、
複数の無線ユーザ装置と、
前記無線ユーザ装置と通信可能なように接続され、前記無線ユーザ装置の位置においてオーバーラップするカバレッジを有する複数の無線送受信装置または協調する分散アンテナと、
同じ周波数バンド内のユーザ装置と複数の同時非干渉ダウンリンクまたはアップリンクデータリンクを形成するためにセル間干渉を実行する空間処理を用いる空間処理手段と、を備え、
前記無線通信ネットワークがロングタームエボリューション(LTE)ネットワークのようなセルラネットワークであり、
開ループプリコーディング方法が、ダウンリンク(DL)チャネルを超えて送受信基地局(BTS)からユーザ機器(UE)に同時非干渉データリンクストリームを受信するように用いられる、ことを特徴とするシステム。 - 異なる音声基準シンボル(SRS)又は復調参照信号(DMRS)が、すべてのユーザ機器(UE)から送受信基地局(BTS)へのチャネルインパルス応答を推定するために使用される、ことを特徴とする請求項12に記載のシステム。
- 異なる音声基準シンボル(SRS)又は復調参照信号(DMRS)が、すべてのユーザ機器(UE)の異なるアンテナに割り当てられる、ことを特徴とする請求項14に記載のシステム。
- 非協調的な送受信基地局(BTS)の間の干渉を低減するように、異なる音声基準シンボル(SRS)又は復調参照信号(DMRS)が送受信基地局(BTS)の異なるサブセットに割り当てられる、ことを特徴とする請求項14に記載のシステム。
- 異なる音声基準シンボル(SRS)又は復調参照信号(DMRS)が、チャネルの周波数ダイバーシティを利用するために、周波数ホッピングパターンに基づいて割り当てられる、ことを特徴とする請求項14に記載のシステム。
- アクティブユーザ機器(UE)が群に分割されるとともに、音声基準シンボル(SRS)又は復調参照信号(DMRS)の同じセットが、連続的な時間スロット上で各群へ割り当てられるように、ことを特徴とする請求項14に記載のシステム。
- 最短のチャネルコヒーレンス時間がすべてのアクティブユーザ機器(UE)に対して推定され、かつ、その情報に基づいて、最大数のユーザ機器(UE)群並びに前記音声基準シンボル(SRS)又は復調参照信号(DMRS)の時分割多重化方式の周期性が計算される、ことを特徴とする請求項18に記載のシステム。
- ユーザ機器(UE)間の時間及び周波数同期はダウンリンク(DL)シグナリング情報を利用することによって達成される、ことを特徴とする請求項13に記載のシステム。
- 前記送受信基地局(BTS)は、同じ物理クロックへの直接的な配線によるか、又は、GPS基準周波数発生器(GPSDO)による共通の時間及び周波数基準を共有することにより、同じ基準クロックに対して同期されている、請求項20に記載のシステム。
- 前記ユーザ機器(UE)間の相対的な伝搬遅延が、同じ送受信基地局(BTS)にリンクされたこれらのユーザ機器(UE)のためだけのアップリンク(UL)を処理することにより回避され、それにより、ユーザ機器(UE)間の時間同期を保証する、ことを特徴とする請求項20に記載のシステム。
- 前記ユーザ機器(UE)間の相対的な伝搬遅延が、送受信基地局(BTS)受信機での前記ユーザ機器(UE)の時間同期を保証するために、アップリンク(UL)送信前に、前記UE側で事前に補償される、ことを特徴とする請求項10に記載のシステム。
- 前記開ループプリコーディング方法が、最大尤度(ML)、決定帰還等化(DFE)又は逐次干渉除去(SIC)受信機を含む非線形空間フィルタを備える、ことを特徴とする請求項20に記載のシステム。
- 前記開ループプリコーディング方法が、ゼロフォーシング(ZF)又は最小平均二乗誤差(MMSE)を含む線形空間フィルタを備える、ことを特徴とする請求項20に記載のシステム。
- 単一キャリアの周波数分割多元接続(SC−FDMA)が、周波数領域内の前記ユーザ機器(UE)を多重化するために使用される、ことを特徴とする請求項13に記載のシステム。
- 無線周波数(RF)補正が、アップリンク(UL)チャネル状態情報(CSI)をダウンリンク(DL)チャネル状態情報(CSI)に変換するために使用され、これによりアップリンク(UL)/ダウンリンク(DL)チャネルの相互性を利用する、ことを特徴とする請求項12に記載のシステム。
- 音声基準シンボル(SRS)又は復調参照信号(DMRS)は、すべてのユーザ機器(UE)から前記送受信基地局(BTS)へのチャネルインパルス応答を推定するために使用される、ことを特徴とする請求項13に記載のシステム。
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