JP5074355B2 - シンボル累算を用いた時間的効率性のある再送信の方法及び装置 - Google Patents
シンボル累算を用いた時間的効率性のある再送信の方法及び装置 Download PDFInfo
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- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
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- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
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Description
図を参照するに、図1は、多重遠隔局6(単純化のためただ1つの遠隔局6のみ図示する)と通信する多数の基地局4からなる本発明の代表的な通信システムを示す。システムコントローラ2は通信システム内のすべての基地局4及び公衆電話交換網(PSTN)8と接続する。システムコントローラ2は、PSTN8に接続されたユーザと遠隔局6のユーザの間の通信を調整する。基地局4から遠隔局6へのデータ送信により、単一パス10を介したフォワードリンクが生じ、遠隔局6から基地局4への送信により、単一パス12を介したリバースリンクが生じる。単一パスは、単一パス10aのような直線パスでも、単一パス14のような反射パスでもよい。反射パス14は、基地局4aから送信された信号が反射源16に反射し、直線パスとは異なるパスを介して遠隔局6に到達するときに発生する。図1ではブロックとして示したが、反射源16は遠隔局6が例えばビルや他の構造内で動作する環境における人工品である。
図6は受信信号を復調するための回路を示した代表的なブロック図である。受信機150あるいは206からのデジタル化されたI及びQのベースバンド信号は相関器610のバンクに提供される。各相関器610は、同一の送信元デバイスからの異なる信号パスあるいは異なる送信元デバイスからの異なる送信に割り当てられてもよい。それぞれ割り当てられた相関器610内では、乗算器620によりベースバンド信号は短PNI及びPNQコードで逆拡散される。各相関器610内の短PNI及びPNQコードは、その相関器610で復調された信号により生じる伝播遅延に対応した特定のオフセットを有する。短PN逆拡散データは乗算器622により、相関器610で受信されたトラフィックチャネルに割り当てられたウォルシュコードで逆カバーされる。逆カバーされたデータはフィルタ624に提供される。フィルタ624はウォルシュシンボル時間で逆カバーされたデータのエネルギーを累算する。
CRC検査では、宛先デバイスは、データパケットがビタビデコーダにより訂正可能な状況で受信されるかを判定することができる。本発明では、多数のプロトコルの1つが、誤って受信されたパケットの再送信を制御するのに用いられ得る。以下の実施形態は、利用可能な方法のいくつかを記載している。他の方法は本発明の延長にあり、本発明の範囲内にある。
代表的な実施形態では、誤ってパケットが受信された場合、宛先デバイスは送信元デバイスにNACKメッセージを送り戻す。誤って受信されたパケットは、現在のフレーム内で新たなパケットとともに、あるいは次のフレームで再送信され得る。好ましくは、誤って受信されたパケットは処理遅延を最小化するために現在のフレーム内で再送信される。代表的な実施形態では、再送信されたパケットは前に送信されたのと同一のコードシンボルから構成される。代替的実施形態では、再送信されたパケットは新たなコードシンボルからなる。
誤り訂正コーディングがデータ送信に用いられる場合、誤って受信されたパケットの充分な再送信はパケットを正しくデコードする必要がない。本発明では、受信パケットを宛先デバイスがデコードし、CRC検査がなされ、これによりパケットが誤って受信されたかを決定できる。パケットが誤って受信された場合、誤って受信されたパケットで構成されるシンボルは次のデコードのために記憶される。代表的な実施形態では、記憶素子あるいは、RAMメモリデバイス、ラッチや他の形式のメモリデバイスのような周知技術のメモリデバイスのうちの1つで実行される。
Claims (10)
- データパケットをデコードする方法であって、
前記データパケットの送信を受信して受信パケットを得る第1の受信ステップと、
前記データパケットの少なくとも1つの再送信を受信して再送信パケットを得る第2の受信ステップと、
前記受信パケットを前記再送信パケットと累算して累算パケットを得るステップと、
前記累算パケットをデコードするステップと、
前記受信パケットのコードシンボルを第1のゲイン因子でスケールするステップと、
前記再送信パケットのそれぞれのコードシンボルを第2のゲイン因子でスケールするステップと、
前記受信パケットの前記コードシンボルを前記再送信パケットの前記コードシンボルと結合して前記累算パケットを得るステップと
を含み、
前記データパケットの前記少なくとも1つの再送信は、第2のデータパケットの送信と同時であり、前記データパケットの前記少なくとも1つの再送信は、前記第2のデータパケットの反復されたシンボルを前記データパケットのコードシンボルで置き換えることによりなされる方法。 - 前記第1の受信ステップは、
前記データパケットの前記送信の少なくとも1つの信号パスを復調して第1のパイロット信号と第1のフィルタされたデータシンボルとを得るステップと、
前記少なくとも1つの信号パスのそれぞれについて、前記第1のパイロット信号と前記第1のフィルタされたデータシンボルとの内積を実行して第1のスカラー値を得るステップと、
前記少なくとも1つの信号パスの前記第1のスカラー値を結合して第1の結合スカラー値を得るステップとを含み、
前記第1の結合スカラー値は前記受信パケットを構成する請求項1記載の方法。 - 前記第2の受信ステップは、
前記データパケットの前記少なくとも1つの再送信の少なくとも1つの信号パスを復調して第2のパイロット信号と第2のフィルタされたデータシンボルとを得るステップと、
前記少なくとも1つの信号パスのそれぞれについて、前記第2のパイロット信号と前記第2のフィルタされたデータシンボルとの内積を実行して第2のスカラー値を得るステップと、
前記少なくとも1つの信号パスの前記第2スカラー値を結合して第2の結合スカラー値を得るステップとを含み、
前記第2の結合スカラー値は前記再送信パケットを構成する請求項1記載の方法。 - 前記第1のゲイン因子は、前記送信の受信信号の信号対ノイズ測定に従って定義され、前記第2のゲイン因子は前記少なくとも1つの再送信の受信信号の信号対ノイズ測定に従って定義される請求項1記載の方法。
- 前記累算ステップは、前記受信パケットの選択されたシンボルを前記再送信パケットのシンボルで置き換えて前記累算パケットを得るステップを含む請求項1記載の方法。
- 前記累算ステップは、
前記受信パケットのシンボルを前記再送信パケットのシンボルとともにインターリーブして前記累積パケットを得るステップを含み、
前記デコードステップは、
前記累算パケットのコードレートに従って実行される請求項1記載の方法。 - 前記再送信パケットのそれぞれは、前記受信パケットの部分を含む請求項1記載の方法。
- 再送信パケットのそれぞれに含まれる前記受信パケットの部分は、前記受信パケットの時間期間についての測定されたEs/I0に基づいて決定される請求項7記載の方法。
- 前記デコードするステップは、束縛長9で実行される請求項1記載の方法。
- 前記デコードするステップは、コードレート1/2で実行される請求項1記載の方法。
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US08/969,319 US6101168A (en) | 1997-11-13 | 1997-11-13 | Method and apparatus for time efficient retransmission using symbol accumulation |
US08/969,319 | 1997-11-13 |
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JP2008286879A Expired - Lifetime JP5074355B2 (ja) | 1997-11-13 | 2008-11-07 | シンボル累算を用いた時間的効率性のある再送信の方法及び装置 |
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US (4) | US6101168A (ja) |
EP (4) | EP1592162B1 (ja) |
JP (3) | JP4242063B2 (ja) |
KR (3) | KR100697578B1 (ja) |
CN (3) | CN1178422C (ja) |
AU (1) | AU767672B2 (ja) |
BR (1) | BR9814863A (ja) |
CA (1) | CA2309932C (ja) |
DE (3) | DE69842145D1 (ja) |
FI (4) | FI117842B (ja) |
HK (5) | HK1086129A1 (ja) |
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IL (3) | IL164827A0 (ja) |
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RU (1) | RU2000114892A (ja) |
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