JP4955783B2 - 高レートパケットデータ伝送の方法および装置 - Google Patents
高レートパケットデータ伝送の方法および装置 Download PDFInfo
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Description
図を参照すると、図1は多数のセル2a−2gを含む本発明の例示的データ通信システムを表わす。各セル2は対応している基地局4によりサービスされる。種々の移動局6がデータ通信システムを通して伝播される。例示的実施例において、各移動局6は各タイムスロットで順方向リンクのせいぜい1つの基地局4と通信するが、移動局6がソフトハンドオフにあるか否かに依存して、逆方向リンクの1つまたはそれ以上の基地局4と通信にあり得る。例えば、基地局4aは移動局6aに排他的にデータを伝送し、基地局4cはタイムスロットnで順方向リンクの移動局6cに排他的データを伝送する。図1において、矢の実線は基地局4から移動局6へのデータ伝送を示す。矢の破線は移動局6がパイロット信号を受信しているが、基地局4からのデータ伝送はない。逆方向リンク通信は単純化のため図1に示されない。
例示的実施例において、移動局6および基地局4間の通信の開始はCDMAシステムのためのそれと似た方法で起る。呼び設定の完成の後、移動局6はページングメッセージの制御チャンネルを監視する。接続状態にある間、移動局6は逆方向リンクにパイロット信号の伝送を始める。
ハンドオフのない場合に、移動局6は1つの基地局4と通信する。図2を参照すると、特定の移動局6のために予定されたデータは、その移動局6との通信を制御するために割り当てられた選択器要素14に供給される。選択器要素14は基地局4内のデータ待ち行列40にそのデータを転送する。基地局4はデータを待ち行列にし、制御チャンネルにページングメッセージを伝送する。基地局4はそれから、移動局6からのDRCメッセージのため逆方向リンクDRCチャンネルを監視する。もしDRCチャンネルで信号が検出されなかったなら、基地局4はDRCメッセージが検出されるまでページングメッセージを再伝送できる。再伝送試みの予定回数の後に、基地局4は移動局6を呼ぶプロセスまたは再開始を終了できる。
ハンドオフの場合に、移動局6は逆方向リンクで多数の基地局4と通信する。例示的実施例において、特定の移動局6への順方向リンクのデータ伝送は1つの基地局4から起る。しかし、移動局6は多数の基地局4からのパイロット信号を同時に受信する。もし基地局4のC/I測定が予定の閾値以上なら、基地局4は移動局6の活動的な組に加えられる。ソフトハンドオフ指示メッセージ中、新しい基地局4は以下に記述される逆方向パワー制御(RPC) ウォルシュチャンネルへ移動局6を割り当てる。移動局6とソフトハンドオフにある各基地局4は逆方向リンク伝送を監視し、それらのそれぞれのRPCウォルシュチャンネルにRPCビットを送る。
本発明のデータ通信システムにおいて重要な考慮すべき問題は、将来の伝送のデータレートを選択するためのC/I算定の精度である。例示的実施例において、C/I測定は、基地局4がパイロット信号を伝送する時間間隔中パイロット信号で実行される。例示的実施例において、このパイロット時間間隔中、パイロット信号のみが伝送されるので、多重経路および干渉の影響が最小である。
例示的実施例において、基地局4は、基地局4に利用可能な最大パワーで、かつ任意の与えられたスロットで単一の移動局6へデータ通信システムにより支持された最大データレートで伝送する。支持され得る最大データレートは動的であり、移動局6により測定されたような順方向リンク信号のC/Iに依存する。好ましくは、基地局4は任意の与えられたタイムスロットでただ1つの移動局6へ伝送する。
本発明の例示的順方向リンクアーキテクチュアのブロック図が図3に示される。データはデータパケットに分割され、CRCエンコーダ112に供給される。各データパケットのため、CRCエンコーダ112はフレームチェックビット(例えばCRCパリティビット)を発生し、コード末尾ビットを挿入する。CRCエンコーダ112からの形式化されたパケットはデータ、フレームチェックおよびコード末尾ビット、および以下に記述される他のオーバヘッドビットを含む。形式化されたパケットはエンコーダ114に供給され、例示的実施例において、それは前述されたU.S.特許出願No.08/743,688に記述された符号化フォーマットにしたがってパケットを符号化する。他の符号化フォーマットも使用され得、本発明の範囲内である。エンコーダ114からの符号化されたパケットはパケット内でコード記号を再順序するインターリーバ116へ供給される。インターリーブされたパケットは以下に記述された方法でパケットの少数部を除去するフレームパンクチャ要素118に供給される。パンクチャされたパケットはスクランブラ122からのスクランブルシーケンスでデータをスクランブルする乗算器120に供給される。パンクチャ要素118およびスクランブラ122は以下に詳細に記述される。乗算器120からの出力はスクランブルされたパケットを含む。
例示的実施例において、各データパケットはフレームチェックビット、コード末尾ビット、および他の制御フィールドの付加により形式化される。この明細書において、オクテットは8情報ビットとして定義され、データユニットは単一オクテットでありかつ8情報ビットを含む。
本発明において、トラヒックチャンネルがまた基地局4から移動局6へメッセージを伝送するために使用される。伝送されるメッセージの型は:(1)ハンドオフ指示メッセージ、(2)ページングメッセージ(例えば、その移動局6のための待ち行列にデータがある特定の移動局6を呼出すこと)、(3)特定の移動局6のための短いデータパケット、および(4)逆方向リンクデータ伝送(ここに後で記述される)用のACKまたはNACKメッセージを含む。他の型のメッセージがまた制御チャンネル上で伝送され得、本発明の範囲内である。呼び設定段階の完成で、移動局6はページングメッセージのため制御チャンネルを監視し、逆方向リンクパイロット信号の伝送を始める。
本発明において、順方向リンクパイロットチャンネルは、最初の取得、位相回復、時間回復およびレート結合のため移動局6により使用されるパイロット信号を提供する。これらの使用はIS-95標準に適合するCDMA通信システムのそれに似ている。例示的実施例において、パイロット信号はまたC/I測定を実行するために移動局6により使用される。
本発明において、順方向リンクパワー制御チャンネルは、遠隔局6からの逆方向リンク伝送の伝送パワーを制御するために使用されるパワー制御命令を送るために使用される。逆方向リンクで、各伝送している移動局6はネットワークで他の全ての移動局6へ干渉源として作用する。逆方向リンクの干渉を最小限にし、容量を最大限にするため、各移動局6の伝送パワーは2つのパワー制御ループにより制御される。例示的実施例において、パワー制御ループは、本発明の譲受人に譲渡され、かつここに引用文献として組込まれた“CDMAセルラー移動電話システムにおける伝送パワーを制御するための方法および装置”と題するU.S.特許No.5,056,109に詳細に記述されたCDMAシステムのそれに似ている。他のパワー制御メカニズムがまた熟考され、本発明の範囲内である。
本発明において、逆方向リンクは可変レートデータ伝送を支持する。可変レートは柔軟性を提供し、移動局6が基地局4へ伝送されるべきデータの量に依存して複数のデータレートの1つで伝送することを許容する。例示的実施例において、移動局6は任意の時間に最も低いデータレートでデータを伝送できる。例示的実施例において、より高いデータレートでのデータ伝送は基地局4による許可を必要とする。この実行は逆方向リンク資源の効率的な利用を提供している間、逆方向リンク伝送遅れを最小限にする。
本発明のデータ通信システムにおいて、逆方向リンク伝送は幾つかの方法で順方向リンク伝送から異なる。順方向リンクにおいては、データ伝送は典型的に1つの基地局4から1つの移動局6へ起る。しかし、逆方向リンクにおいては、各基地局4は多数の移動局6から同時にデータ伝送を受信できる。例示的実施例において、各移動局6は基地局4へ伝送されるべきデータの量に依存している複数のデータレートの1つで伝送できる。このシステム設計はデータ通信の非対称特性を反映する。
本発明の例示的逆方向リンクアーキテクチュアのブロック図が図13に示される。データはデータパケットに区分され、エンコーダ612へ供給される。各データパケットについて、エンコーダ612はCRCパリティビットを発生し、コード末尾ビットを挿入し、データを符号化する。例示的実施例において、エンコーダ612は前述のU.S.特許出願No.08/743,688に記述された符号化フォーマットに従ってパケットを符号化する。他の符号化フォーマットがまた使用され得、本発明の範囲内である。エンコーダ612からの符号化されたパケットはパケット内でコード記号を再順序付けするブロックインターリーバ614へ供給される。インターリーブされたパケットはウォルシュカバーでデータをカバーしかつカバーされたデータを利得要素618へ供給する乗算器616へ供給される。利得要素618はデータレートと無関係なビットEbにつき一定エネルギーを維持するためデータをスケール合わせする。利得要素618からのスケール合わせされたデータは、それぞれPN−QおよびPN−I系列でデータを拡散する乗算器650bおよび650dへ供給される。乗算器650bおよび650dからの拡散されたデータは、それぞれデータを濾波するフィルタ652bおよび652dへ供給される。フィルタ652aおよび652bからの濾波された信号は合計器654aへ供給され、フィルタ652cおよび652dからの濾波された信号は合計器654bへ供給される。合計器654はデータチャンネルからの信号とパイロット/DRCチャンネルからの信号とを合計する。合計器654aおよび654bの出力は、それぞれ(順方向リンクとして)同相正弦COS(Wct)および直角正弦SIN(Wct)で変調されかつ合計される(図13に示されない)IOUTおよびQOUTをそれぞれ含む。例示的実施例においてトラヒックデータは正弦の同相および直角位相の両方で伝送される。
パイロット/DRCチャンネルの例示的ブロック図が図13に示される。DRCメッセージは予定のコーディングフォーマットに従ってメッセージを符号化するDRCエンコーダ626へ供給される。間違った順方向リンクデータレート決定がシステムスループット性能に強い影響を与えるので、DRCメッセージの符号化はDRCメッセージの誤りの可能性を十分に低くする必要のため重要である。例示的実施例において、DRCエンコーダ626は、3ビットDRCメッセージを8ビットコード語に符号化するレート(8、4)CRCブロックエンコーダである。符号化されたDRCメッセージは、DRCメッセージが向けられる行き先基地局4を1つしかなく識別するウォルシュコードでメッセージをカバーする乗算器628へ供給される。ウォルシュコードはウォルシュ発生器624により供給される。カバーされたDRCメッセージは、メッセージをパイロットデータと乗算する乗算器(MUX)630へ供給される。DRCメッセージおよびパイロットデータはそれぞれPN−IおよびPN−Q信号でデータを拡散する乗算器650aおよび650cへ供給される。かくして、パイロットおよびDRCメッセージは正弦の同相および直角位相の両方で伝送される。
アクセスチャンネルは登録位相中、基地局4へメッセージを伝送するために移動局6により使用される。例示的実施例において、アクセスチャンネルは移動局6によりランダムにアクセスされる各スロットを有するスロットされた構成を使用して実行される。例示的実施例において、アクセスチャンネルはDRCチャンネルと時間多重化される。
本発明において、移動局6はデータチャンネルにNACKメッセージを伝送する。NACKメッセージは移動局6により誤りで受信された各パケットとして発生される。例示的実施例において、NACKメッセージは、前述されたU.S.特許No.5,504,773に記述されたように、ブランクおよびバースト信号データフォーマットを使用して伝送され得る。
Claims (8)
- 品質指標が、基地局から受信されたパイロット信号に基づいて決定され、データレートおよび伝送変調フォーマットにマップし、前記品質指標を移動局から前記基地局へ周期的に伝送することと、
前記品質指標の関数として決定された前記データレートで前記基地局から前記移動局へ送られるデータの伝送を受信することを含み、
前記伝送変調フォーマットは、4相位相偏移変調(QPSK)に対応する、
通信システムにおける方法。 - 品質指標が、基地局から受信されたパイロット信号に基づいて決定され、データレートおよび伝送変調フォーマットにマップし、前記品質指標を移動局から前記基地局へ周期的に伝送することと、
前記品質指標の関数として決定された前記データレートで前記基地局から前記移動局へ送られるデータの伝送を受信することを含み、
前記伝送変調フォーマットは、16値−直交振幅変調(16−QAM)に対応する、
通信システムにおける方法。 - 品質指標が、基地局から受信されたパイロット信号に基づいて決定され、データレートおよび伝送変調フォーマットにマップし、前記品質指標を移動局から前記基地局へ周期的に伝送することと、
前記品質指標の関数として決定された前記データレートで前記基地局から前記移動局へ送られるデータの伝送を受信することを含み、
前記品質指標は、さらに符号化レートにマップする、
通信システムにおける方法。 - 品質指標が、基地局から受信されたパイロット信号に基づいて決定され、データレートおよび伝送変調フォーマットにマップし、前記品質指標を移動局から前記基地局へ周期的に伝送することと、
前記品質指標の関数として決定された前記データレートで前記基地局から前記移動局へ送られるデータの伝送を受信することを含み、
前記品質指標は、さらに直交コードの数にマップする、
通信システムにおける方法。 - 品質指標が、基地局から受信されたパイロット信号に基づいて決定され、データレートおよび伝送変調フォーマットにマップし、移動局から前記基地局へ前記品質指標を周期的に伝送する手段と、
前記品質指標の関数として決定された前記データレートで前記基地局から前記移動局へ送られるデータの伝送を受信する手段とを含み、
前記伝送変調フォーマットは、4相位相偏移変調(QPSK)に対応する、
通信システムに適合された装置。 - 品質指標が、基地局から受信されたパイロット信号に基づいて決定され、データレートおよび伝送変調フォーマットにマップし、移動局から前記基地局へ前記品質指標を周期的に伝送する手段と、
前記品質指標の関数として決定された前記データレートで前記基地局から前記移動局へ送られるデータの伝送を受信する手段とを含み、
前記伝送変調フォーマットは、16値−直交振幅変調(16−QAM)に対応する、
通信システムに適合された装置。 - 品質指標が、基地局から受信されたパイロット信号に基づいて決定され、データレートおよび伝送変調フォーマットにマップし、移動局から前記基地局へ前記品質指標を周期的に伝送する手段と、
前記品質指標の関数として決定された前記データレートで前記基地局から前記移動局へ送られるデータの伝送を受信する手段とを含み、
前記品質指標は、さらに符号化レートにマップする、
通信システムに適合された装置。 - 品質指標が、基地局から受信されたパイロット信号に基づいて決定され、データレートおよび伝送変調フォーマットにマップし、移動局から前記基地局へ前記品質指標を周期的に伝送する手段と、
前記品質指標の関数として決定された前記データレートで前記基地局から前記移動局へ送られるデータの伝送を受信する手段とを含む、
前記品質指標は、さらに直交コードの数にマップする、
通信システムに適合された装置。
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