JP5425397B2 - 適応型前方誤り訂正を行う装置及び方法 - Google Patents
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0009—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding
Description
Claims (21)
- n>kであり、ソースデータのk個のパケットを、冗長データを含むn個のパケットの符号化冗長データに符号化する前方誤り訂正符号器と、
前記冗長データの量を長期的な観点からネットワークの状態に適合させる場合には受信機からのフィードバックメッセージであるRTCPレポートを利用し、前記冗長データの量を迅速な観点からネットワークの状態に適合させる場合には前記RTCPレポートに係るレイヤーよりも低位のレイヤーに係る再送信情報を利用することで、増加又は減少する関数に基づいて、(n−k)個のうち送信対象とする冗長パケットの数を徐々に増減し、適応化を行うFEC適応型装置と
を有する送信側の装置。 - 前記フィードバックメッセージは、前記符号化冗長データが送信されるネットワークの状態を表す、請求項1記載の装置。
- 前記ネットワークは、無線ネットワークである、請求項2記載の装置。
- 前記FEC適応型装置は、前記フィードバックメッセージが良好な状態の前記無線ネットワークを示す場合、前記冗長データとなる冗長パケットの数をゼロを最小として1つだけ減らす、請求項3記載の装置。
- 前記FEC適応型装置は、前記フィードバックメッセージが良好でない状態の前記無線ネットワークを示す場合、前記冗長データとなる冗長パケットの数を(n−k)を最大として1つだけ増やす、請求項3記載の装置。
- 前記ソースデータの前記k個のパケットは、少なくとも一部に、ビデオストリーミングデータを有する、請求項2記載の装置。
- 前記RTCPレポートは、損失したパケット部分及び損失したパケットの累積数を特定する、請求項1記載の装置。
- 前記ネットワークの状態は、実際に受信したビットレート対提案される送信ビットレートに基づいており、かつ所定の閾値と比較される、請求項2記載の装置。
- 前記FEC適応型装置は、前記実際の受信ビットレート及び前記提案される送信ビットレートの両方が増加している場合、前記冗長データとして送信する冗長パケットの数を増やす、請求項8記載の装置。
- 前記RTCPレポートに係るレイヤーよりも低位のレイヤーが、MACレイヤーである、請求項1記載の装置。
- 前記前方誤り訂正符号器は、消失パケットレベルFECを用いて前記k個のパケットのソースデータを符号化する、請求項1記載の装置。
- ソースデータのk個のパケットを、冗長データを含むn個のパケットの符号化冗長データに符号化することで(n>k)、無線ネットワークを介するビデオストリーミングの適応型前方誤り訂正(FEC)を行うために送信側の装置が行う方法であって、
前記冗長データの量を長期的な観点から無線ネットワークの状態に適合させる場合には受信機からのフィードバックメッセージであるRTCPレポートを利用し、前記冗長データの量を迅速な観点から無線ネットワークの状態に適合させる場合には前記RTCPレポートに係るレイヤーよりも低位のレイヤーに係る再送信情報を利用することで、増加又は減少する関数に基づいて、(n−k)個のうち送信対象とする冗長パケットの数を徐々に増減し、FEC適応型装置により適応化を行う段階
を有する方法。 - 前記適応化を行う段階において、前記フィードバックメッセージが良好な状態の前記無線ネットワークを示す場合、前記冗長データとなる冗長パケットの数をゼロを最小として1つだけ減らす、請求項12記載の方法。
- 前記適応化を行う段階において、前記フィードバックメッセージが良好でない状態の前記無線ネットワークを示す場合、前記冗長データとなる冗長パケットの数を(n−k)を最大として1つだけ増やす、請求項12記載の方法。
- 前記RTCPレポートは、損失したパケット部分及び損失したパケットの累積数を特定する、請求項12記載の方法。
- 前記ネットワークの状態は、実際に受信したビットレート対提案される送信ビットレートに基づいており、かつ所定の閾値と比較される、請求項12記載の方法。
- 前記適応化を行う段階において、前記実際の受信ビットレート及び前記提案される送信ビットレートの両方が増加している場合、前記冗長データとして送信する冗長パケットの数を増やす、請求項16記載の方法。
- 前記RTCPレポートに係るレイヤーよりも低位のレイヤーが、MACレイヤーである、請求項12記載の方法。
- 前記適応化を行う段階において、前記符号化されたn個のパケットが送信された場合より低いパケットレートが受信された場合、前記冗長データとして送信する冗長パケットの数を増加させることを禁止する、請求項12記載の方法。
- 前記適応化を行う段階において、前記符号化されたn個のパケットが送信された場合より低いパケットレートが受信された場合、前記冗長データとして送信する冗長パケットの数を減らす、請求項19記載の方法。
- 前記n個のパケットの符号化冗長データに符号化する場合において、消失パケットレベルFECを用いて前記k個のパケットのソースデータを符号化する、請求項12記載の方法。
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US63248904P | 2004-12-02 | 2004-12-02 | |
US60/632,489 | 2004-12-02 | ||
PCT/US2005/020928 WO2006060036A1 (en) | 2004-12-02 | 2005-06-14 | Adaptive forward error correction |
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JP5425397B2 true JP5425397B2 (ja) | 2014-02-26 |
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EP (1) | EP1817859A1 (ja) |
JP (1) | JP5425397B2 (ja) |
CN (1) | CN101061659B (ja) |
BR (1) | BRPI0516632A (ja) |
WO (1) | WO2006060036A1 (ja) |
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JP2001045098A (ja) | 1999-05-26 | 2001-02-16 | Canon Inc | データ通信システム、データ通信装置、データ通信方法及び記憶媒体 |
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JP3841256B2 (ja) * | 2000-02-15 | 2006-11-01 | 三菱電機株式会社 | 通信システム及び通信方法及び送信端末 |
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JP4173755B2 (ja) * | 2003-03-24 | 2008-10-29 | 富士通株式会社 | データ伝送サーバ |
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US7328393B2 (en) * | 2004-04-13 | 2008-02-05 | Cisco Technology, Inc. | Forward error correction in packet networks |
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US8015474B2 (en) | 2011-09-06 |
CN101061659A (zh) | 2007-10-24 |
JP2008522545A (ja) | 2008-06-26 |
BRPI0516632A (pt) | 2008-09-16 |
CN101061659B (zh) | 2015-04-29 |
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