JP4943654B2 - Mimowlanシステム - Google Patents
Mimowlanシステム Download PDFInfo
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- JP4943654B2 JP4943654B2 JP2004547244A JP2004547244A JP4943654B2 JP 4943654 B2 JP4943654 B2 JP 4943654B2 JP 2004547244 A JP2004547244 A JP 2004547244A JP 2004547244 A JP2004547244 A JP 2004547244A JP 4943654 B2 JP4943654 B2 JP 4943654B2
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/38—TPC being performed in particular situations
- H04W52/50—TPC being performed in particular situations at the moment of starting communication in a multiple access environment
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/10—Small scale networks; Flat hierarchical networks
- H04W84/12—WLAN [Wireless Local Area Networks]
Description
本願は、2002年10月25日に提出された「MIMO WLANシステム」と題される米国仮出願第60/421,309号の利益を主張する。
図1は、多くのユーザをサポートし、本発明の多様な態様及び実施形態を実現することができるMIMO WLANシステム100を示している。MIMO WLANシステム100は、多くのユーザ端末(UT)120のための通信をサポートする多くのアクセスポイント(AP)110を含む。簡単にするために、図1には2つのアクセスポイント110だけが図示されている。アクセスポイントは、通常、ユーザ端末と通信するために使用される固定局である。アクセスポイントは基地局と呼ばれてもよく、または他のなんらかの専門用語で呼ばれてもよい。
・保証されたサービスの質(QoS)
・高瞬間データレート
・高スペクトル効率
・拡張カバレージ範囲
MIMO WLANシステムは、選択された動作バンドに特殊な帯域幅及びエミッション制約を条件として多様な周波数バンド(例えば、2.4GHzバンドと5.xGHz U−NIIバンド)で操作されてよい。システムは、通常1km以下という最大セルサイズで屋内配備と屋外配備の両方をサポートするように設計される。いくつかの動作モードも携帯動作及び運動制限動作をサポートするが、該システムは固定端末アプリケーションをサポートする。
特定の実施形態では、及び明細書を通して説明されるように、それぞれのアクセスポイントはデータ伝送及び受信のための4本の送信アンテナ及び受信アンテナを装備しており、該同じ4本のアンテナが送信するため、及び受信するために使用される。システムは、この構成が、通常、アンテナが共用されるときよりさらに低い性能を提供しようとも、デバイスの送信アンテナ及び受信アンテナ(例えば、アクセスポイント、ユーザ端末)が共用されないケースもサポートする。MIMO WLANシステムは、各アクセスポイントがなんらかの他の数の送信/受信アンテナを備えるように設計されてもよい。各ユーザ端末は、データ伝送及び受信のための単一の送信/受信アンテナまたは複数の送信/受信アンテナを備えてよい。各ユーザ端末タイプにより利用されるアンテナの数は、例えば、ユーザ端末によりサポートされるサービス(例えば、音声、データまたは両方)、コストの考慮すべき事項、規定面の制約、安全性問題等の多様な要因に依存してよい。
一実施形態では、MIMO WLANシステムは全体的なシステム帯域幅を多くの(NF)直交サブバンドに効果的に分割するためにOFDMを利用する。これらのサブバンドは、トーン、ビン、または周波数チャネルとも呼ばれる。OFDMを用いると、各サブバンドはデータで変調されてよいそれぞれの副搬送波と関連付けられる。OFDMを活用するMIMOシステムの場合、各サブバンドの各空間チャネルは、各サブバンドと関連付けられる複雑な利得がサブバンド帯域幅全体で事実上一定である独立した伝送チャネルと見なされてよい。
図2は、MIMO WLANシステムのために使用されてよい層構造200を描いている。層構造200は(1)第3層及びISO/OSI参照モデルの高い方(上位層)にほぼ相当するアプリケーション及び上位層プロトコル、(2)第2層(リンク層)に相当するプロトコル及びサービス、及び(3)第1層(物理層)に相当するプロトコル及びサービスを含む。
多くのサービス及びアプリケーションは、MIMO WLANシステムによってサポートされてよい。さらに、適切なシステム動作のために必要とされる他のデータは、アクセスポイントにより送信される、あるいはアクセスポイント及びユーザ端末の間で交換される必要がある。多くのトランスポートチャネルは、多様なタイプのデータを搬送するためにMIMO WLANシステムのために定義されてよい。表3は、トランスポートチャネルの例示的な集合を一覧表示し、トランスポートチャネルごとの簡略な説明も提供する。
トランスポートチャネルには多くのフレーム構成が定義されてよい。MIMO WLANシステムのために使用する特定のフレーム構成は、例えば、(1)ダウンリンクとアップリンクに同じ周波数バンドが使用されるのか、あるいは異なる周波数バンドが使用されるのか、及び(2)トランスポートチャネルをともに多重化するために使用される多重化方式などの多様な要因に依存している。
トランスポートチャネルは多様なタイプのデータを送信するために使用され、2つのグループ、つまり共通トランスポートチャネル及び専用トランスポートチャネルに分類されてよい。該共通トランスポートチャネル及び専用トランスポートチャネルは異なる目的で使用されるため、さらに詳しく後述されるように、トランスポートチャネルのこれら2つのグループには異なる処理が使用されてよい。
BCHはビーコンパイロット、MIMOパイロット及びシステムパラメータをユーザ端末に送信するためにアクセスポイントにより使用される。該ビーコンパイロットは、システムタイミングと周波数を獲得するためにユーザ端末によって使用される。MIMOパイロットはアクセスポイントアンテナにより形成されるMIMOチャネル及び専用アンテナを推定するためにユーザ端末により使用される。ビーコンパイロット及びMIMOパイロットはさらに詳しく後述される。システムパラメータはダウンリンク伝送及びアップリンク伝送の多様な属性を指定する。例えば、FCCHセグメント、FCHセグメント、RACHセグメント及びRCHセグメントの持続期間が可変であるため、現在のTDDフレームについてこれらのセグメントのそれぞれの長さを指定するシステムパラメータはBCHで送信される。
一実施形態では、アクセスポイントはフレーム単位でFCH及びRCH用のリソースを割り当てることができる。FCCHは、FCH及びRCH用のリソース割り当て(つまり、チャネル割り当て)を伝達するためにアクセスポイントによって使用される。
IEタイプ0及び4は、それぞれダイバーシティモード及びビームステアリングモードにFCH/RCHリソースを割り当てるために使用される。(例えば音声)固定低速サービスの場合、呼の持続期間のために固定されたままである。可変レートサービスの場合は、レートはFCH及びRCHのために単独で選択されてよい。FCCH IEは、ユーザ端末に割り当てられるFCH及びRCH PDUのロケーションを示す。表8に、例示的なIEタイプ0及び4の情報要素の多様なフィールドを一覧表示する。
IEタイプ1は、空間多重化モードを使用してユーザ端末にFCH/RCHリソースを割り当てるために使用される。これらのユーザ端末のレートは可変であり、FCH及びRCHのために単独で選択されてよい。表12に、例示的なIEタイプ1の情報要素の多様なフィールドを一覧表示している。
IEタイプ2は、空き状態(後述される)で動作しているユーザ端末に制御情報を与えるために使用される。一実施形態では、ユーザ端末が空き状態にあるときには、空間処理のためにアクセスポイント及びユーザ端末によって使用されるステアリングベクトルは、再開される場合、データ伝送が迅速に開始できるように連続して更新される。表13に、例示的なIEタイプ2情報要素の多様なフィールドを一覧表示する。
IEタイプ3は、RACHを介してシステムにアクセスしようと試みるユーザ端末に迅速な肯定応答を与えるために使用される。システムに対するアクセスを獲得するため、あるいはアクセスポイントにショートメッセージを送信するために、ユーザ端末はアップリンク上でRACH PDUを送信してよい。ユーザ端末がRACH PDUを送信してから、それは、RACH Acknowledgement Bitが設定されているかどうかを判断するためにBCHを監視する。このビットは、任意のユーザ端末がシステムにアクセスすることに成功し、肯定応答がFCCH上の少なくとも1つのユーザ端末のために送信されている場合にアクセスポイントによって設定される。このビットが設定されると、ユーザ端末はFCCH上で送信される肯定応答のためにFCCHを処理する。アクセスポイントがそれがリソースを割り当てないでユーザ端末からRACH PDUを正しく復号したことを肯定応答することを所望する場合に、IEタイプ3情報要素が送信される。表14に、例示的なIEタイプ3情報要素の多様なフィールドを一覧表示する。
RACHは、システムへのアクセスを獲得するため、及びショートメッセージをアクセスポイントに送信するためにユーザ端末により使用される。RACHの動作は、後述されるスロットアロハランダムアクセスプロトコルに基づいている。
FCHは、特定のユーザ端末にユーザに固有なデータを、複数のユーザ端末にページ/放送メッセージを送信するためにアクセスポイントによって使用される。FCHは、ユーザ端末にパイロットを送信するためにも使用されてよい。FCHはフレーム単位で割り当てることができる。FCHの様々な使用に対処するために多くのFCH PDUタイプが提供される。表17に、FCH PDUタイプの例示的な集合を一覧表示する。
RCHは、データ及びパイロットをアクセスポイントに送信するためにユーザ端末により使用される。RCHは、TDDフレーム単位で割り当てられてよい。1つ以上のユーザ端末は指定されるTDDフレームでRCH上で送信するように指定されてよい。RCH上での様々な動作モードに対処するために多くのRCH PDUタイプが提供される。表20に、RCH PDUタイプの例示的な集合を一覧表示する。
FCH及びRCH上でのデータ伝送は単独で発生できる。FCH及びRCH用に使用するために選択された伝送モードに応じて、(ビームステアリングモード及びダイバーシティモードのための)1つ以上の空間チャネルがアクティブとなり、各専用トランスポートチャネルごとのデータ伝送のために使用されてよい。各空間チャネルは特定のレートと関連付けられてよい。
明確にするために、特定のPDUタイプ、PDU構造、メッセージフォーマット等が例示的な設計について説明されてきた。さらに少ない、追加の、及び/または異なるタイプ、構造、及びフォーマットも使用のために定義されてよく、これは本発明の範囲内である。
前記説明では、同じOFDMサブバンド構造がトランスポートチャネルのすべてに対して使用されている。異なるトランスポートチャネルに対し異なるOFDMサブバンド構造を使用することにより効率の改善が達成されてよい。例えば、64サブバンド構造はいくつかのトランスポートチャネルのために使用されてよく、256サブバンド構造はなんらかの他のトランスポートチャネルに使用されてよい等である。さらに、ある指定されたトランスポートチャネルに複数のOFDMサブバンド構造が使用されてよい。
前述されたトランスポートチャネルは多様なサービス及び機能のために多様なデータのタイプを送信するために使用される。各トランスポートチャネルは、1つ以上のレート及び1つ以上の伝送モードをサポートするように設計されてよい。
多くの伝送モードがトランスポートチャネルのためにサポートされている。各伝送モードは、後述されるように、送信機及び受信機での特定の空間処理と関連付けられている。表24に、トランスポートチャネルのそれぞれによりサポートされている伝送モード(複数の場合がある)を一覧表示する。
トランスポートチャネルに対して多くの異なるレートがサポートされている。それぞれのレートは特定の情報点率及び特定のスペクトル効率(またはデータレート)を集合的に生じさせる特定の変調方式と関連付けられている。表25に、システムによりサポートされている多様なレートを一覧表示する。
図7は、MIMO WLANシステム内のアクセスポイント110x及び2つのユーザ端末120xと120yの実施形態のブロック図を示している。
図8Aは、ダイバーシティモードのために送信処理を実行できる送信機装置800の実施形態のブロック図を示している。送信機装置800はアクセスポイント及びユーザ端末の送信機部分のために使用されてよい。
h1及びh2は検討中のサブバンドについて該2本の送信アンテナから該受信アンテナへの経路利得であり、この場合経路利得はサブバンド上で一定であり、2記号期間上で静的であると仮定され、
n1及びn2は、それぞれ該2個の受信された記号r1及びr2に関連付けられている雑音である。
h i(k)及びh j(k)はサブバンドkについて2本の送信アンテナiとjからNR本の受信アンテナへの経路利得のベクトルであり、各ベクトルが関連付けられた送信アンテナからNR本の受信アンテナのそれぞれへのチャネル利得を含み、この場合、経路利得はサブバンド上で一定となり、該2つの記号期間上で静的であると見なされ、
n 1(k)及びn 2(k)は、それぞれ2個の受信ベクトルr 1(k)及びr 2(k)と関連付けられた雑音ベクトルである。
kはサブバンドインデックスを示し、
NSTはパイロットサブバンド及びデータサブバンドの数であり、
cn(k)は記号期間nのサブバンドkで送信される記号を示し、
TsはOFDM記号持続期間であり、
Δfは各サブバンドの帯域幅である。
図9Aは、空間多重化モードのための送信処理を実行できる送信機装置900のブロック図を示している。送信機装置900は、アクセスポイント及びユーザ端末の送信機部分の別の実施形態である。空間多重化モードの場合、再び4本の送信アンテナ及び4本の受信アンテナが利用できると仮定すると、データは最高4つの空間チャネル上で送信されてよい。空間チャネルごとに、これの伝送容量に応じて異なるレートが使用されてよい。各レートは、表25に示されるように特定の情報点率及び変調方式に関連付けられている。以下の説明では、NE個の空間チャネルがデータ伝送用に使用するために選択され、この場合NE≦Ns≦min{NT,NR}であると仮定される。
x(k)は、サブバンドkのための該4本の送信アンテナ(つまり、x(k)=[x1(k)x2(k)x3(k)x4(k)]Tから送信される記号のための4つのエントリ付きの「送信」ベクトルであり、
H(k)は、サブバンドkの(NRxNT)チャネル応答マトリクスであり、
n(k)は、サブバンドkの付加白色ガウス雑音(AWGN)のベクトルである。
D(k)は、R(k)の固有値の(NTxNT)の対角マトリクスである。
Σ(k)は、D(k)の対角成分の正の平方根、R(k)の固有値である、H(k)の特異値を含む対角マトリクスであり、
U(k)は、その列がH(k)の左の固有ベクトルであるマトリクスである。
図10Aはビームステアリングモードのために送信処理を実行できる送信機装置1000のブロック図を示している。送信機装置1000はアクセスポイント及びユーザ端末の送信機部分のさらに別の実施形態である。
図11Aは、TXデータプロセッサによる以後の処理の前に各FCH/RCHパケットのためのデータをフレームに入れるために使用されるフレーミング装置808の実施形態を示している。このフレーミング機能はBCH、FCCH、及びRACHで送信されるメッセージについて迂回されてよい。フレーミング装置は、FCH/RCHパケットごとに整数のPHYフレームを生成し、その場合各PHYフレームはここに説明されている実施形態の場合6個のOFDM記号に及ぶ。
一実施形態では、各トランスポートチャネルのデータビットは符号化の前にスクランブルされる。スクランブリングは、すべての1またはすべてのゼロの長い系列が送信されないようにデータをランダム化する。これによりピークにおける変動をOFDM波形の平均電力に削減することができる。該スクランブリングは、1つ以上のトランスポートチャネルについて省略してよく、選択的に有効または無効にしてよい。
一実施形態では、伝送の前にデータを符号化するためにベースコードが使用される。このベースコードは1つの情報点率のためにコードビットを生成する。(表25に一覧表示されるように)システムによりサポートされている他のすべての情報点率は、コードビットを反復するまたはパンクチャするかのどちらかによって取得されてよい。
一実施形態では、送信されるコードビットは、48のデータサブバンド全体でインタリーブされる。ダイバーシティモード及びビームステアリングモードの場合、コードビットの1つのストリームが送信され、すべてのデータサブバンド全体でインタリーブされる。空間多重化モードの場合、コードビットの最高4つのストリームが、最高4つの空間チャネルで送信されてよい。該インタリーブは、コードビットの各ストリームがそのストリームを送信するために使用される空間チャネルのすべてのデータサブバンド全体でインタリーブされるように空間チャネルごとに別個に実行されてよい。表29は、すべての伝送モードのためのインタリーブに使用されてよい例示的なコードビット−サブバンド割り当てを示している。
表31は、システムによりサポートされている多様な変調方式のためのシンボルマッピングを示している。(BPSKを除く)変調方式ごとに、ビットの半分が同相(I)構成部分にマッピングされ、ビットの他の半分が直角(q)構成部分にマッピングされる。
s=(I+jQ)・Knorm
ここではI及びQは該信号配列について表31の値である。
空間多重化モードの場合、PDUは複数の空間チャネル上で送信されてよい。複数の空間チャネル上での伝送のためにデータを処理するために多様な方式が使用されてよい。空間多重化モードのための2つの特定の処理方式が後述される。
次に該ビットインデックスは表29を使用して対応するサブバンドにマッピングされる。
TDDシステムの場合、ダウンリンクとアップリンクが時分割2重化方法で同じ周波数バンドを共用する。この場合、通常、ダウンリンクチャネル応答とアップリンクチャネル応答間には高度な相関関係が存在する。この相関関係はチャネル推定及び空間処理を簡略化するために利用されてよい。TDDシステムの場合、無線リンクの各サブバンドは互恵的であると仮定されてよい。つまり、H(k)がサブバンドkのアンテナアレイAからアンテナアレイBまでのチャネル応答マトリクスを表す場合には、互恵的なチャネルは、アレイBからアレイAへの結合がH(k)という転置、つまりH T(k)により示されることを暗示している。
T ut(k)及びRut(k)はNutxNutの対角マトリクスであり、複素利得のためのエントリは、サブバンドkのためのユーザ端末でのNut本のアンテナについて、それぞれ該送信チェイン及び受信チェインと関連付けられ、
H(k)はダウンリンクのためのNutxNapのチャネル応答マトリクスである。
アクセスポイント及びユーザ端末での空間処理は、送信チェイン/受信チェインの差異を説明するために校正が実行された後に、TDDシステムのために簡略化されてよい。前記に注記したように、校正されたダウンリンクチャネル応答は
Σ(k)はH cup(k)での特異値の(NapxNut)対角マトリクスであり、
V ut(k)はH cup(k)の右側固有ベクトルの(NutxNut)ユニタリーマトリクスである。
F ut(k)は式(15)の中のV(k)の代わりをし、チャネル反転を達成するためのG(k)による信号スケーリングは簡単にするために式(42)で省略され、
x up(k)はサブバンドkのためのアップリンクの送信ベクトルである。
n up(k)はサブバンドkの加法的白色ガウス雑音(AWGN)である。
TDDシステムのための互恵的なチャネル及び校正のため、アクセスポイントとユーザ端末両方における空間処理は簡略化されてよい。表32に、データ伝送及び受信のためのアクセスポイント及びユーザ端末での空間処理を要約する。
特定のチャネル状態の場合、1つのワイドバンド固有モード(通常、最良または主要なワイドバンド固有モード)だけでデータを送信することはより優れている。これは、主要なワイドバンド固有モードで使用可能な送信電力のすべてを使用することにより改善された性能が達成されるように、他のすべてのワイドバンド固有モードのための受信されたSNRが十分に低い(poor)場合に当てはまることがある。
アクセスポイント及びユーザ端末がタイミング及び周波数の獲得、チャネル推定、及び適切なシステム運用に必要とされる他の機能を実行できるようにするためにMIMO WLANシステムにはパイロット構造が提供されている。表33に、4つのタイプのパイロット及び例示的なパイロット構造のそれらの短い説明を一覧表示する。パイロット構造には、さらに少ない、異なった、及び/または追加のパイロットタイプも使用されてよい。
ダウンリンクビーコンパイロットは、(図5Aに図示されるように)BCHの第1の部分に含まれ、各TDDフレームで送信される。ビーコンパイロットは、アクセスポイントにおける4本のアンテナのそれぞれから送信される(「B」として示される)特定のOFDM記号を含む。同じB OFDM記号は、ビーコンパイロットのための2記号持続期間で2度送信される。
ダウンリンクMIMOパイロットは、(図5Aに示されるような)BCHの第2の部分に含まれ、各TDDフレームで送信される。MIMOパイロットはアクセスポイントでの4本のアンテナのそれぞれから送信される(「P」として示される)特定のOFDM記号を含む。同じP OFDM記号はMIMOパイロットのための8記号持続期間で8度送信される。しかしながら、その各アンテナに割り当てられる8個のP OFDM記号は、そのアンテナに割り当てられている別の4チップウォルシュ系列で「カバーされている」。カバリングは、送信される指定されたパイロットまたはデータ記号(あるいは同じ値の付いたL個のパイロット記号/データ記号の集合)が、次に送信されるL個のカバーされた記号を取得するためにLチップ直交系列のL個すべてのチップにより乗算されるプロセスである。デカバリング(decovering)は、受信された記号が、次に送信されたパイロット記号/データ記号の推定値を取得するために蓄積されるL個のデカバリングされた記号を取得するために該同じLチップ直交系列のL個のチップにより乗算される相補的なプロセスである。カバリングはNT本の送信アンテナからのNTのパイロット伝送の間で直交性を達成し、ユーザ端末が個々の送信アンテナを区別できるようにする。カバリングはウォルシュ系列または他の直交系列で達成されてよい。
ステアリング基準は、各アクティブユーザ端末により(図5Cに図示されるような)RACH PDUあるいは(図5E及び図5Gに図示されるような)RCH PDUのプリアンブル部分で送信されてよい。ステアリング基準は、アクティブユーザ端末に対し、アクセスポイントにより(図5E及び図5Fに図示されるような)FCH PDUのプリアンブル部分で送信されてもよい。
ステアリング基準は、(アップリンクのための)ユーザ端末または(ダウンリンクのための)アクセスポイントにおける送信アンテナのすべてから送信される特定のOFDM記号(例えば、MIMOパイロットに使用されるのと同じP OFDM記号)を備える。しかしながら、記号期間ごとのP OFDM記号は、1つの固有モードのためのステアリングベクトルを用いて空間的に処理される(つまり、ビームフォーミングされる)。
p(k)はサブバンドkのパイロット記号であり、
K′={−32,.....,31}は、64すべてのサブバンドのためのインデックスの集合である。
ビームステアリングモードの場合、送信側での空間処理は主要なワイドバンド固有モードのための正規化された固有ベクトルの集合を使用して実行される。正規化された固有ベクトルを用いる全体的な伝達関数は正規化されていない固有ベクトルを用いる全体的な伝達関数とは異なる(つまり
ここに説明されるOFDMサブバンド構造は、−21、−7、7、及び21というインデックスが付いた4つのパイロットサブバンドを含んでいる。一実施形態では、キャリヤパイロットはプリアンブルの一部ではないすべてのOFDM記号の中の4つのパイロットサブバンドで送信される。該キャリヤパイロットは送信機と受信機の両方で発振器内のドリフトのために位相変化を追尾するために受信機により使用されてよい。これにより改善されたデータ復調性能が提供されてよい。
図12Aは、ユーザ端末の動作のための状態図1200の特定の実施形態を示している。この状態図は4つの状態、Init状態1210、Dormant(休眠)状態1220、Access(アクセス)状態130、及びConnected(接続)状態1240を含んでいる。状態1210、1220、1230及び1240のそれぞれは多くのサブステート(簡単にするために図12Aでは図示せず)に関連付けられてよい。
一実施形態では、ユーザ端末がMIMO WLANシステムにアクセスできるようにするためにランダムアクセス方式が利用される。一実施形態では、ランダムアクセス方式は、それによりユーザ端末がシステムへのアクセスを獲得しようとするためにランダムに選択されたRACHスロットで送信するスロットアロハ方式に基づいている。ユーザ端末は、アクセスが獲得されるまで、あるいは最大数のアクセス試行に達するまでRACHで複数の伝送を送信してよい。各RACH伝送のための多様なパラメータは後述されるように成功の尤度を高めるために変更されてよい。
アクセスポイントはFCH及びRCHでのダウンリンク伝送及びアップリンク伝送を予定し、さらにすべてのアクティブなユーザ端末のためのレートを制御する。さらに、アクセスポイントはアップリンクで特定のアクティブなユーザ端末の送信電力を調整する。多様な制御ループは、アクティブユーザ端末ごとにレート、送信電力、及びタイミングを調整するために維持されてよい。
アクセスポイントは、FCH及びRCHで固定レートサービスと可変レートサービスの両方をサポートできる。固定レートサービスは、音声、ビデオ等に使用されてよい。可変レートサービスはパケットデータ(例えば、ウェブブラウジング)のために使用されてよい。
レート制御は、変化するチャネル状態にFCH/RCHのレートを適応させるためにFCH及びRCHで動作する可変レートサービスのために使用されてよい。FCH及びRCHのために使用するためのレートは個別に制御されてよい。さらに、空間多重化モードでは、各専用トランスポートチャネルのワイドバンド固有モードごとのレートが単独で制御されてよい。レート制御は、各アクティブユーザ端末により提供されるフィードバックに基づいてアクセスポイントによって実行される。アクセスポイント内のスケジューラはデータ伝送を予定し、アクティブユーザ端末のためのレート割り当てを決定する。
各アクティブユーザ端末は、各TTDフレーム内でBCH上で送信されるMIMOパイロットに基づいてダウンリンクチャネルを推定できる。アクセスポイントは、特定のユーザ端末に送信されるFCH PDU内でステアリング基準を送信してもよい。BCHでMIMOパイロットを、及び/またはFCHでステアリング基準を使用すると、ユーザ端末は受信されたSNRを推定し、FCHでサポートできる最大レートを決定できる。ユーザ端末が空間多重化モードで動作している場合には、最大レートはワイドバンド固有モードごとに決定されてよい。各ユーザ端末は(空間多重化モードのための)各ワイドバンド固有モードによりサポートされる最大レート、(ビームステアリングモードのための)主要なワイドバンド固有モードによりサポートされる最大レート、またはRCH PDUのFCH Rate Indicatorフィールド内の(ダイバーシティモードのための)MIMOチャネルによってサポートされている最大レートをアクセスポイントに戻すことができる。これらのレートは、前述された注水を実行するために次に使用されてよい、受信されたSNRにマッピングされてよい。代わりに、ユーザ端末は、アクセスポイントがダウンリンクによりサポートされる最大レートを決定できるようにするために(受信されたSNRなどの)十分な情報を送り返してよい。
各ユーザ端末は、システムアクセスの間にRACHで、FCH/RCHリソースに割り当てられるとRCHでステアリング基準を送信する。アクセスポイントはRCH上でのステアリング基準に基づいてワイドバンド固有モードのそれぞれに受信されたSNRを推定し、各ワイドバンド固有モードによりサポートされる最大レートを決定できる。初期に、アクセスポイントは各ワイドバンド固有モードによりサポートされている最大レートで、または最大レート近くで確実な動作を可能にするためにチャネルの良好な推定値を有さなくてよい。確実性を改善するために、FCH/RCHで使用される初期レートは最大サポートレートよりはるかに低くてよい。アクセスポイントは、チャネルの改善された推定値を取得するために多くのTDDフレーム上でステアリング基準を統合できる。チャネルの推定値が改善するにつれて、レートは増加されてよい。
固定レートサービスの場合(レート制御の代わりに)RCHでアップリンク伝送のために電力制御が使用されてよい。固定レートサービスの場合、レートは呼セットアップ時に交渉され、接続の持続期間の間固定されたままである。いくつかの固定レートサービスが制限された移動度要件と関連付けられてよい。一実施形態では、電力制御は、アップリンクがユーザ端末の間の干渉に対して保護するために実現されるが、ダウンリンクのためには使用されない。
タイミング制御は、ダウンリンク及びアップリンクが時分割2重化方法で同じ周波数バンドを共用するTDDに基づいたフレーム構成で有利に使用されてよい。ユーザ端末はシステム全体に配置されてよく、したがってアクセスポイントに対する異なる伝播遅延と関連付けられてよい。アップリンクでの効率を最大限にするために、各ユーザ端末からのRCH及びRACHでのアップリンク伝送のタイミングはこれの伝搬遅延を説明するために調整できる。したがって、これは、様々なユーザ端末からのアップリンク伝送がアクセスポイントでの特定の時間ウィンドウ内に到着し、アップリンクで互いに、あるいはダウンリンク伝送と干渉しないことを保証する。
Claims (18)
- 順方向制御チャネルの第1のサブチャネル上で第1のコーディングレート及び変調スキームの組み合わせで少なくとも1つのユーザ端末の第1の集合のためのシグナリング情報を送信することと、
前記順方向制御チャネルの第2のサブチャネルで第2のコーディングレート及び変調スキームの組み合わせで少なくとも1つのユーザ端末の第2の集合のためのシグナリング情報を送信し、前記第2のコーディングレート及び変調スキームの組み合わせは前記第1のコーディングレートおよび変調スキームの組み合わせと異なり、かつ前記第2のコーディングレートは前記第1のコーディングレートより高く、前記第2のサブチャネルは前記第1のサブチャネルの後に送信されることと、
を備える、直交周波数分割多重(OFDM)を用いた無線多入力多出力(MIMO)通信システム内でシグナリング情報を送信する方法。 - 前記順方向制御チャネルの第3のサブチャネルで第3のコーディングレート及び変調スキームの組み合わせで少なくとも1つのユーザ端末の第3の集合のためのシグナリング情報を送信し、前記第3のコーディングレート及び変調スキームの組み合わせは前記第2のコーディングレート及び変調スキームの組み合わせと異なり、かつ前記第3のコーディングレートは前記第2のコーディングレートより高く、前記第3のサブチャネルは前記第2のサブチャネルの後に送信されることをさらに備える、請求項1に記載の方法。
- 前記第1のサブチャネルは、前記第2のサブチャネルが現在のフレーム内で送信されるかどうかを示す、請求項1に記載の方法。
- 第1のコーディングレート及び変調スキームの組み合わせに基づいて少なくとも1つのユーザ端末の第1の集合に関するシグナリング情報を処理するように、及び
前記第1のコーディングレートとは異なる第2のコーディングレート及び変調スキームの組み合わせに基づいて少なくとも1つのユーザ端末の第2の集合に関するシグナリング情報を処理するように、
機能的に作用する送信データプロセッサと、及び
順方向制御チャネルの第1のサブチャネル上で前記第1のユーザ端末集合のための前記処理されたスケジューリング情報を送信するように、ここにおいて、前記第2のコーディングレートは前記第1のコーディングレートより高い、
前記順方向制御チャネルの第2のサブチャネルで前記第2のユーザ端末集合のための前記処理されたスケジューリング情報を送信し、前記第2のサブチャネルは前記第1のサブチャネルの後に送信されるように、
機能的に作用する送信機装置と、
を備える、直交周波数分割多重(OFDM)を用いた、無線無線多入力多出力(MIMO)通信システムにおける装置。 - 前記送信データプロセッサは前記第2のコーディングレート及び変調スキームの組み合わせとは異なる第3のコーディングレート及び変調スキームの組み合わせに基づいて少なくとも1つのユーザ端末の第3の集合に関するシグナリング情報を処理するようにさらに作動し、前記第3のコーディングレートは前記第2のコーディングレートより高く、前記送信機装置は前記順方向制御チャネルの第3のサブチャネルで前記第3のユーザ端末集合に関する前記処理されたシグナリング情報を送信するようにさらに作動し、前記第3のサブチャネルは前記第2のサブチャネルの後に送信される、請求項4に記載の装置。
- 前記第1のサブチャネルは、前記第2のサブチャネルが現在のフレームの中で送信されるかどうかを示す、請求項4に記載の装置。
- 順方向制御チャネルの第1のサブチャネル上で第1のコーディングレート及び変調スキームの組み合わせで少なくとも1つのユーザ端末の第1の集合に関するシグナリング情報を送信するための手段と、
前記順方向制御チャネルの第2のサブチャネル上で第2のコーディングレート及び変調スキームの組み合わせで少なくとも1つのユーザ端末の第2の集合に関するシグナリング情報を送信するための手段であって、前記第2のコーディングレート及び変調スキームの組み合わせは前記第1のコーディングレート及び変調スキームの組み合わせとは異なり、前記第2のコーディングレートは前記第1のコーディングレートより高く、前記第2のサブチャネルは前記第1のサブチャネルの後に送信される手段と、
を備える、直交周波数分割多重(OFDM)を用いた、無線無線多入力多出力(MIMO)通信システムにおける装置。 - 前記順方向制御チャネルの第3のサブチャネルで第3のコーディングレート及び変調スキームの組み合わせで少なくとも1つのユーザ端末の第3の集合に関するシグナリング情報を送信するための手段であって、前記第3のコーディングレート及び変調スキームの組み合わせは前記第2のコーディングレート及び変調スキームの組み合わせとは異なり、かつ前記第3のコーディングレートは前記第2のコーディングレートより高く、前記第3のサブチャネルは前記第2のサブチャネルの後に送信される手段をさらに備える、請求項7に記載の装置。
- 前記第1のサブチャネルは、前記第2のサブチャネルが現在のフレームの中で送信されるかどうかを示す、請求項7に記載の装置。
- 順方向制御チャネルの第1のサブチャネル上で第1のコーディングレート及び変調スキームの組み合わせで送信されるシグナリング情報を受信することと、
前記ユーザ端末向けのシグナリング情報が前記第1のサブチャネルから取得されない場合に、前記順方向制御チャネルの第2のサブチャネル上で第2のコーディングレート及び変調スキームの組み合わせで送信されるシグナリング情報を受信し、前記第2のコーディングレート及び変調スキームの組み合わせは前記第1のコーディングレート及び変調スキームの組み合わせとは異なり、かつ前記第2のコーディングレートは前記第1のコーディングレートより高く、前記第2のサブチャネルは前記第1のサブチャネルの後に送信されることと、
を備える、直交周波数分割多重(OFDM)を用いた、無線多入力多出力(MIMO)通信システムにおけるユーザ端末で搬送情報を受信する方法。 - 前記ユーザ端末のためのシグナリング情報が前記第2のサブチャネルから取得されない場合に、前記順方向制御チャネルの第3のサブチャネル上で第3のコーディングレート及び変調スキームの組み合わせで送信されるシグナリング情報を受信し、前記第3のコーディングレート及び変調スキームの組み合わせは前記第2のコーディングレート及び変調スキームの組み合わせとは異なり、かつ前記第3のコーディングレートは前記第2のコーディングレートより高く、前記第3のサブチャネルは前記第2のサブチャネルの後に送信されることをさらに備える、請求項1に記載の方法。
- 前記順方向制御チャネルのサブチャネルに関する復号失敗に遭遇すると前記順方向制御チャネルの処理を終了することをさらに備える、請求項1に記載の方法。
- 順方向制御チャネルの第1のサブチャネル上で第1のコーディングレート及び変調スキームの組み合わせで送信されるシグナリング情報を受信するように、及び
前記ユーザ端末に関するシグナリング情報が前記第1のサブチャネルから取得されない場合に、前記順方向制御チャネルの第2のサブチャネル上で第2のコーディングレート及び変調スキームの組み合わせで送信される少なくとも1つのユーザ端末の第2のセットに関するシグナリング情報を受信し、前記少なくとも1つのユーザ端末の第2のセットは、前記少なくとも1つのユーザ端末の第1のセットとは異なり、前記第2のコーディングレート及び変調スキームの組み合わせは前記第1のコーディングレート及び変調スキームの組み合わせとは異なり、かつ前記第2のコーディングレートは前記第1のコーディングレートより高く、前記第2のサブチャネルは前記第1のサブチャネルの後に送信されるように、
機能的に作用する受信データプロセッサと、
前記第1のサブチャネル及び前記第2のサブチャネルに関する処理を命令するように機能的に作用するコントローラと、を備える、直交周波数分割多重(OFDM)を用いた、無線多入力多出力(MIMO)通信システムにおける装置。 - 前記受信データプロセッサは、前記ユーザ端末に関するシグナリング情報が前記第2のサブチャネルから取得されない場合に、前記順方向制御チャネルの第3のサブチャネル上で第3のコーディングレート及び変調スキームの組み合わせで送信される、少なくとも1つのユーザ端末の第3のセットに関するシグナリング情報を受信するようにさらに機能的に作用し、前記第3のコーディングレート及び変調スキームの組み合わせは前記第2のコーディングレート及び変調スキームの組み合わせとは異なり、かつ前記第3のコーディングレートは前記第2のコーディングレートより高く、前記第3のサブチャネルは前記第2のサブチャネルの後に送信される、請求項13に記載の装置。
- 前記コントローラは、前記順方向制御チャネルのサブチャネルのための復号失敗に遭遇すると前記順方向制御チャネルの処理を終了するようにさらに機能的に作用する、請求項13に記載の装置。
- 順方向制御チャネルの第1のサブチャネル上で第1のコーディングレート及び変調スキームの組み合わせで送信される、少なくとも1つのユーザ端末の第1のセットに関するシグナリング情報を受信するための手段と、
前記ユーザ端末に関するシグナリング情報が前記第1のサブチャネルから取得されない場合に、前記順方向制御チャネルの第2のサブチャネル上で第2のレートで送信される、少なくとも1つのユーザ端末の第2のセットに関するシグナリング情報を受信するための手段であって、前記少なくとも1つのユーザ端末の第2のセットは、前記少なくとも1つのユーザ端末の第1のセットとは異なり、前記第2のコーディングレート及び変調スキームの組み合わせが前記第1のコーディングレート及び変調スキームの組み合わせとは異なり、かつ前記第2のコーディングレートは前記第1のコーディングレートより高く、前記第2のサブチャネルは前記第1のサブチャネルの後に送信される手段と、
を備える、直交周波数分割多重(OFDM)を用いた無線多入力多出力(MIMO)通信システムにおけるユーザ端末のための装置。 - 前記ユーザ端末に関するシグナリング情報が前記第2のサブチャネルから取得されない場合に、前記順方向制御チャネルの第3のサブチャネル上で第3のコーディングレート及び変調スキームの組み合わせで送信される、少なくとも1つのユーザ端末の第3のセットに関するシグナリング情報を受信するための手段であって、前記第3のコーディングレート及び変調スキームの組み合わせは前記第2のコーディングレート及び変調スキームの組み合わせとは異なり、かつ前記第3のコーディングレートは前記第2のコーディングレーとより高く、前記第3のサブチャネルは前記第2のサブチャネルの後に送信される手段をさらに備える、請求項16に記載の装置。
- 前記順方向制御チャネルのサブチャネルのための復号失敗に遭遇すると前記順方向制御チャネルの処理を終了するための手段をさらに備える、請求項16に記載の装置。
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US10/693,419 | 2003-10-23 | ||
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