JP5435681B2 - 適応クラスタ構成及び切替による多重キャリア通信 - Google Patents
適応クラスタ構成及び切替による多重キャリア通信 Download PDFInfo
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Description
本発明は、無線通信の分野に関し、より厳密には、本発明は、直交周波数分割多重化(OFDM)を使っている多重セル多重加入者無線システムに関する。
1つのセルの中で、各加入者がOFDMA内の異なるサブキャリアを有するように調整することができる。各加入者用の信号は互いに直交させることができるので、セル内干渉は殆ど起きない。しかしながら、積極的な周波数再使用プラン、例えば同一スペクトルを多数の隣接するセルで使用する場合、セル間干渉の問題が発生する。OFDMAシステムにおけるセル間干渉も周波数選択性であるのは明らかで、サブキャリアの適応割り当てを行ってセル間干渉の影響を緩和するのは、有用なことである。
ここに開示する技法を、例としてOFDMA(クラスタ)を使って説明する。しかしながら、本技法は、OFDMAをベースとするシステムに限定されるわけではない。本技法は、一般的には多重キャリアシステムに適用することができ、例えは、キャリアは、OFDMAのクラスタ、CDMAの拡散コード、SDMA(空間分割多重アクセス)のアンテナビームなどとなる。或る実施形態では、サブキャリア割当は、各セル内で別々に行なわれる。各セル内では、個々の加入者(例えば、携帯電話など)に対する割当についても、割当毎にセル内の全加入者を考慮に入れて割当決定が行われる各セル内の加入者に対する統合割当とは反対に、新しい加入者がシステムに追加される度に漸進的に行なわれる。
ここに説明する技術は、データトラフィックチャネル用のサブキャリア割当に着眼している。セルラーシステムには、通常、制御情報の交換及び他の目的のために事前に割り当てられた別のチャネルがある。これらのチャネルは、ダウンリンク及びアップリンク制御チャネル、アップリンクアクセスチャネル、及び時間・周波数同期チャネルを含んでいることが多い。
図1Bは、加入者へのクラスタ割当のプロセスの或る実施形態を示すフロー図である。本プロセスは、ハードウェア(例えば、専用論理、回路など)、ソフトウェア(例えば、汎用コンピュータシステム又は専用機械などで稼動するもの)、又は両者の組み合わせから成る処理論理によって実行される。
或る実施形態では、異なる変調及び符号化速度を使用して、異なるSINRを有するチャネルで信頼性の高い送信をサポートする。非常に低いSINRで信頼性を改善するために、複数のサブキャリアによる信号拡散を使用してもよい。
或る実施形態では、各基地局は、パイロット記号を同時に送信し、各パイロット記号は図2A−Cに示すようにOFDM周波数帯域幅全体を占めている。図2A−Cに示すように、パイロット記号201は、セルA、B、及びCそれぞれに関してOFDM周波数帯域全体を横断して広がっていることが分かる。或る実施形態では、各パイロット記号は、128マイクロ秒の長さ又は持続時間にガードタイムが付いて、合計で凡そ152マイクロ秒となっている。各パイロット期間の後、所定数のデータ期間があって、その後にパイロット記号の別のセットが続いている。或る実施形態では、各パイロットの後にデータ送信に使用される4つのデータ期間があり、各データ期間は152マイクロ秒となっている。
HiSi+Ii+ni=yi
ここに、Siはサブキャリア(freq.band)iの信号を表し、Iiはサブキャリアiの干渉であり、niはサブキャリアiに対応付けられたノイズであり、yiはサブキャリアiの観察である。512サブキャリアの場合、iは0から511の範囲にある。Ii及びniは、分離されておらず1つの量と考えてもよい。干渉/ノイズ及びチャネルゲインHiは分かっていない。パイロット期間中に、パイロット記号を表す信号Si及び観察yiが分かり、これにより干渉又はノイズがない場合についてのチャネルゲインHiを求めることができる。一旦これが分かると、Hi、Si、及びyiが全て分かっているので、方程式に当てはめて、データ期間中の干渉/ノイズを求めることができる。
或る実施形態では、加入者は、可能であれば、PP/(PP−PD)が比較的大きい(例えば、10dBのような閾値よりも大きい)クラスタを選択し、PP/(PP−PD)が比較的小さい(例えば、10dBのような閾値よりも小さい)クラスタを避ける。
代わりに、差は、以下のような、クラスタ内の各加入者毎に、パイロット期間中に観測されるサンプルとデータトラフィック期間中に観測されるサンプルの間のエネルギー差に基づいていてもよい。
β=f(SINR,PP/(PP−PD)
ここに、fは2つの入力の関数である。fの1つの例は、加重平均(例えば、等重量)である。代わりに、加入者は、SINRに基づいてクラスタを選択し、同じようなSINRを有するクラスタを判別するのに、パワー差PP−PDだけを使用してもよい。差は、閾値(例えば、1dB)よりも小さくてもよい。
或る実施形態では、ダウンリンクの場合、フィードバックは、選択されたクラスタのインデクスとそのSINRの両方を保有している。任意のクラスタフィードバックの代表的なフォーマットを図5に示す。図5に示すように、加入者は、クラスタとその付帯するSINR値を示すため、クラスタインデクス(ID)を提供する。例えば、フィードバックでは、加入者は、クラスタID1(501)及び当該クラスタのSINRであるSINR1(502)、クラスタID2(503)及び当該クラスタのSINRであるSINR2(504)、及びクラスタID3(505)及び当該クラスタのSINRであるSINR3(506)などを提供する。クラスタのSINRは、サブキャリアのSINRの平均を使って作ることができる。こうして、複数の任意のクラスタを候補として選択することができる。上記のように、選択されたクラスタは、優先順位を示すためにフィードバック内で順序付けることもできる。或る実施形態では、加入者は、クラスタの優先順位リストを作成し、SINR情報を優先順位の降順で返信する。
基地局は、リクエストを行っている加入者に望ましいクラスタを割り当てる。或る実施形態では、加入者に割り当てるクラスタの利用可能性は、クラスタ上の合計トラフィックロードに左右される。従って、基地局は、SINRが高いだけでなく、トラフィックロードが低いクラスタを選択する。
別の実施形態では、ダウンリンクの場合、クラスタはグループに分割される。各グループは、複数のクラスタを含んでいてもよい。図6は、代表的な分割例を示している。図6に示すように、グループ1−4は、グループ分けの結果として各グループに入れられたクラスタを指す矢印で示されている。或る実施形態では、各グループ内のクラスタは、帯域幅全体に亘って遠く離されている。或る実施形態では、各グループ内のクラスタは、チャネルコヒーレンス帯域幅、即ちその中のチャネル応答が概ね同じである帯域幅、よりも更に離されている。コヒーレント帯域幅の代表的な値は、多くのセルラーシステムについて100kHzである。これは、各グループ内の周波数ダイバーシティを改善し、グループ内のクラスタの少なくとも一部が高SINRを提供できる確率を上げることになる。クラスタは、グループに割り当てられる。グループベースのクラスタ割当の目的には、クラスタ指標付けのデータビットを減じ、これにより、クラスタ割当用のフィードバックチャネル(情報)と制御チャネル(情報)の帯域幅要件を緩和することである。グループベースのクラスタ割当は、セル間干渉を低減するためにも使用される。
或る実施形態では、クラスタには2つのカテゴリ、即ち互いに接近している複数のサブキャリアを保有するコヒーレンスクラスタと、少なくとも一部がスペクトル全体に遙か離れて拡散しているサブキャリアを保有するダイバーシティクラスタがある。コヒーレンスクラスタ内の複数のサブキャリアの接近度は、チャネルコヒーレンス帯域幅内、即ち、チャネル応答が概ね同じ帯域幅内、具体的には、多くのセルラーシステムでは通常100kHz以内、であるのが望ましい。これに対し、ダイバーシティクラスタ内のサブキャリアの拡散は、多くのセルラーシステムでは通常100kHz以内であるチャネルコヒーレンス帯域幅よりも広いのが望ましい。従って、このような場合の一般的な目標は拡散を最大化することである。
Claims (4)
- OFDMAシステムによりセル内の複数の加入者と送受信する基地局によって複数のサブキャリアを有するクラスタを割り当てる方法であって、
第1のデータ送信のために第1の加入者に第1のクラスタ識別情報を付与して少なくともあるサブキャリアが別のサブキャリアから周波数が離れた複数のサブキャリアを含むダイバーシティクラスタを割り当て、
前記ダイバーシティクラスタを用いる前記第1の加入者への前記第1のデータ送信と同時に起こる第2の加入者への第2のデータ送信のために、該第2の加入者に第2のクラスタ識別情報を付与して連続したサブキャリアのみからなるコヒーレンスクラスタを割り当てるとともに、
前記第1のクラスタ識別情報は、前記複数の離れたサブキャリアの間隔を定めるものであることを特徴とする方法。 - 第1のセットの複数の加入者の各々は、第2のセットの複数の加入者の各々に割り当てられる複数のコヒーレンスクラスタの各々と同時に使用するために、それぞれ複数のダイバーシティクラスタのうちの1つを割り当てられ、
前記第1のセット及び前記第2のセットにおける加入者の数の時間に応じた変化に伴い、前記第1のセットに割り当てられるダイバーシティクラスタの数と前記第2のセットに割り当てられるコヒーレンスクラスタの数とが変化することを特徴とする請求項1に記載の方法。 - OFDMAシステムによりセル内の複数の加入者と送受信して複数のサブキャリアを有するクラスタを割り当てる基地局であって、
第1のデータ送信のために第1の加入者に少なくともあるサブキャリアが別のサブキャリアから周波数が離れた複数のサブキャリアを含むダイバーシティクラスタを割り当て、かつ、前記ダイバーシティクラスタを用いる前記第1の加入者への前記第1のデータ送信と同時に起こる第2のデータ送信のために第2の加入者に連続したサブキャリアのみからなるコヒーレンスクラスタを割り当てるように設計されたコントローラ、並びに、
前記第1の加入者に前記ダイバーシティクラスタの割り当ての際に第1のクラスタ識別情報を付与し、前記第2の加入者に前記コヒーレンスクラスタの割り当ての際に第2のクラスタ識別情報を付与するように設計された受信/送信回路を備えるとともに、
前記第1のクラスタ識別情報は、前記複数の離れたサブキャリアの間隔を定めるものであることを特徴とする基地局。 - 第1のセットの複数の加入者の各々は、第2のセットの複数の加入者の各々に割り当てられる複数のコヒーレンスクラスタの各々と同時に使用するために、それぞれ複数のダイバーシティクラスタのうちの1つを割り当てられ、
前記第1のセット及び前記第2のセットにおける加入者の数の時間に応じた変化に伴い、前記第1のセットに割り当てられるダイバーシティクラスタの数と前記第2のセットに割り当てられるコヒーレンスクラスタの数とが変化することを特徴とする請求項3に記載の基地局。
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