JP4718479B2 - 適応fec符号語管理 - Google Patents
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Description
本願は、米国特許法119条(e)項に基づき、「DYNAMIC MANAGEMENT OF COMMUNICATION SYSTEM(通信システムの動的管理)」と称する2003年12月7日出願の米国特許仮出願第60/527,853号(代理人事件番号0101‐p01p)の優先権を主張し、その開示内容を参照によって本書に組み込む。
本発明は、一般的に、デジタル通信システムを管理するための方法、システム、および装置に関する。さらに詳しくは、本発明は、DSLシステムのような通信システムの性能に影響するシステム性能の動的制御に関する。
デジタル加入者線(DSL)技術は、既存の電話加入者線(ループおよび/または銅線プラントと呼ばれる)より潜在的に大きい帯域幅をデジタル通信に提供する。電話加入者線は、音声帯域のみのアナログ通信を目的とするそれらの当初の設計にもかかわらず、この帯域幅を提供することができる。特に非対称DSL(ADSL)は、各トーン(または副搬送波)に多数のビットを割り当てる離散マルチトーン(DMT)ラインコードを使用することによって加入者線の特性に適応することができ、それは、加入者線の各端点におけるモデム(一般的に、送信器および受信器の両方として機能するトランシーバ)のトレーニングおよび初期化中に決定されるチャネルの状態に応じて調整することができる。
適応FEC符号化は、通信システムにおけるFEC符号語の符号語構成を調整するために使用される。符号語構成比は、システムの目標伝送誤り値からの測定伝送誤り値の分散に応じて調整することができる。符号語構成比は、該当するFEC符号化スキームにおけるペイロードおよびパリティバイト間の関係を表す任意の数量または値とすることができる。符号語構成比の調整は、ADSL1システムにおけるN、K、および/またはR値のようなパラメータ、またはADSL2システムにおけるINPおよび/または最大インタリーブ遅延値の調整とすることができる。FEC符号化を適応的に管理するのに使用される様々な値を監視、解析、かつ調整するために、制御装置を使用することができる。本発明は、送信器が伝送チャネルを介して受信器にデータを送信する、DSLシステムのような伝送システムで実現することができる。
本発明の以下の詳細な説明は、本発明の一つまたはそれ以上の実施形態について言及するが、本発明はそのような実施形態に限定されない。むしろ、詳細な説明は単なる例証のつもりである。図面に関連して本書に掲げる詳細な説明は、説明を目的として提供するものであって、本発明はこれらの限られた実施形態を超えるものであることを、当業者は容易に理解されるであろう。
遅延=4ms
S=2
R=8(したがって1符号語当たり4バイトの誤りを訂正することができる)
K=188
であり、したがって各FEC出力データフレームは(2×188+8)/2=192
(K/R=23.5)
となる。
Claims (22)
- 符号語構成比(CCR)を使用する適応FEC(前方誤り訂正)符号器用の制御装置であって、前記CCRは適用できるFEC符号化方式におけるペイロードバイト数とパリティバイト数の関係性を表す量または値であり、さらに前記FEC符号器は、FEC符号化、インタリーブ、元のネットデータ転送速度、および元の伝送レイテンシを使用して送信器がチャネルを介してデータを受信器に送信するDSL(デジタル加入者線)システムで使用され、
前記チャネルにおいて検出されるインパルスノイズ事象を示す伝送誤りを含む前記DSLシステムにおける伝送誤りを表す測定済みのデータ値である測定伝送誤り値(MEV)を取得するように構成され、前記DSLシステムに結合されるデータモジュールと、
前記チャネルにおいて検出される前記伝送誤りに応じて使用するために所定期間にわたって前記チャネルの性能の履歴を記憶し、前記DSLシステムに結合される履歴データモジュールと、
前記DSLシステムにおける伝送誤りのための目標データ値である目標伝送誤り値(TEV)および前記チャネルの性能の前記履歴に対して前記MEVを解析するように構成され、前記データモジュールおよび前記履歴データモジュールに結合される解析モジュールであって、前記解析に基づいて前記TEVを達成するために、調整されたFEC符号化を実現することを必要とされる前記CCRに対する任意の調整を繰り返し決定するように構成され、さらに、前記TEVを達成するために前記調整されたFEC符号化を実現するための前記CCRに対する任意の調整に基づき、前記元の伝送レイテンシを保つために必要とされる前記送信器のインタリーブに対する任意の調整を決定するように構成される前記解析モジュールと、
前記DSLシステムに対して、前記TEVを達成するために調整されたFEC符号化を実現するために前記解析モジュールによって決定される前記CCRに対する任意の調整、および前記元の伝送レイテンシを保つために前記解析モジュールにより決定される前記送信器のインタリーブに対する任意の調整を実現するように命令する制御信号を発生するように構成され、前記解析モジュールに結合される制御信号発生器と、
を備えた制御装置。 - 前記CCRに対する調整が、インパルスノイズ保護値(INP)を使用して実現される、請求項1に記載の制御装置。
- 前記CCRに対する調整が、パラメータN、K、R、またはSの少なくとも一つを使用して実現される、請求項1に記載の制御装置。
- 前記元の伝送レイテンシを保つための前記送信器インタリーブに対する調整が、パラメータS、またはDの少なくとも一つを使用して実現される、請求項3に記載の制御装置。
- 前記MEVが、ビット誤り率、誤り秒数、誤り分数、固定期間における符号違反回数、
前記受信器で測定された信号対雑音比、またはTCP/IPスループットの少なくとも一つに基づく、請求項1に記載の制御装置。 - 前記データモジュール、前記解析モジュール、および前記制御信号発生器が、コンピュータプログラムによって実装され、またはハードウェアとして実装される、請求項1に記載の制御装置。
- 前記TEVが閾誤り率限界である、請求項1に記載の制御装置。
- 前記履歴データモジュールがデータベースである、請求項1に記載の制御装置。
- 前記制御装置が動的スペクトルマネージャを備える、請求項1に記載の制御装置。
- 前記データモジュールが前記MEVを表す入力信号を受け取る、請求項1に記載の制御装置。
- データがチャネルにより送信器と受信器との間で伝送されるDSL(デジタル加入者線)システムでFEC(前方誤り訂正)符号化を調整する方法であって、前記DSLシステムがFEC符号化、インタリーブ、元のネットデータ転送速度、および元の伝送レイテンシを使用し、
(a)FEC符号化方式におけるペイロードバイト数とパリティバイト数との関係を表すCCR(符号語構成比)を選択するステップと、
(b)前記CCR、前記FEC符号化方式、前記元のネットデータ転送速度、および元の伝送レイテンシを使用して、前記チャネルを介してデータを伝送するステップと、
(c)前記チャネルにおけるインパルスノイズ事象を示すMEV(測定伝送誤り値)を取得するステップと、
(d)前記MEVを、前記チャネルにおいて検出される伝送誤りに対する目標データ値を示すTEV(目標伝送誤り値)および前記DSLシステムに結合される履歴データモジュールから取得される所定期間にわたる前記チャネルの性能に関する履歴データと比較するステップと、
(e)前記MEVが前記TEVと十分に大きく異なる場合に前記FEC符号化を調整するために前記CCRを調整するステップと、
(f)前記CCRに対する前記調整に基づき、前記送信器インタリーブに対する調整が前記元の伝送レイテンシを保つために必要とされるかどうかを評価するステップと、
(g)必要とされる場合は、前記元の伝送レイテンシを保つために必要とされる前記調整を実現するステップと、
ステップ(b)から(g)を繰り返すステップと、
を備えた方法。 - 前記MEVを取得するステップが、前記DSLシステムの特性を直接測定するステップと、要素管理システムから値を収集するステップと、または収集されたデータから前記MEVを計算するステップとの少なくとも一つを備えた、請求項11に記載の方法。
- 前記方法が制御装置によって実行される、請求項11に記載の方法。
- 前記制御装置が、CO内の動的スペクトルマネージャである、COの外部の動的スペクトルマネージャである、前記DSLシステムのオペレータである、または前記DSLシステムのどのオペレータからも独立している、請求項13に記載の方法。
- 前記CCRがK/Nである、請求項11に記載の方法。
- 前記CCRに対する調整が、インパルスノイズ保護値(INP)を使用して実現される、請求項11に記載の方法。
- 前記CCRに対する調整が、N、K、RまたはSの少なくとも一つを使用して実現される、請求項11に記載の方法。
- 前記元の伝送レイテンシを保つための前記送信器のインタリーブに対する調整が、パラメータSまたはDの少なくとも一つを使用して実現される、請求項17に記載の方法。
- 前記MEVが、ビット誤り率、誤り秒数、誤り分数、固定期間における符号違反回数、前記受信器で測定された信号対雑音比、またはTCP/IPスループットの少なくとも一つに基づく、請求項11に記載の方法。
- ステップ(b)から(g)が、コンピュータプログラムによって実現される、請求項11に記載の方法。
- ステップ(b)から(g)がハードウェアによって実行される、請求項11に記載の方法。
- 伝送チャネルと、
前記伝送チャネルに結合された送信器と、
前記送信器に結合された適応FEC(前方誤り訂正)符号器と、
前記伝送チャネルに結合された受信器/復号器と、
前記受信器/復号器に結合された伝送誤り値監視装置であって、ビット誤り率、誤り秒数、誤り分数、固定期間における符号違反回数、前記受信器/復号器で測定された信号対雑音比、およびTCP/IPスループットから構成される群の少なくとも一つに基づく伝送誤り値を監視して、入力信号を発生させるように動作する伝送誤り値監視装置と、
前記適応FEC符号器と結合された請求項1に記載の制御装置と、
を備えた伝送システム。
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JP2011103680A (ja) | 2011-05-26 |
DE602004026918D1 (en) | 2010-06-10 |
AU2004298118B2 (en) | 2010-03-18 |
US20050138524A1 (en) | 2005-06-23 |
US7809996B2 (en) | 2010-10-05 |
ATE466423T1 (de) | 2010-05-15 |
US7428669B2 (en) | 2008-09-23 |
US20090086800A1 (en) | 2009-04-02 |
CN1906879B (zh) | 2010-05-26 |
JP5380427B2 (ja) | 2014-01-08 |
CN1906879A (zh) | 2007-01-31 |
CA2548743C (en) | 2015-11-24 |
CA2548743A1 (en) | 2005-06-23 |
AU2004298118A1 (en) | 2005-06-23 |
CN101841389A (zh) | 2010-09-22 |
WO2005057837A1 (en) | 2005-06-23 |
EP2187558A3 (en) | 2012-01-04 |
EP2187558B1 (en) | 2015-05-13 |
JP2007513557A (ja) | 2007-05-24 |
EP1700410B1 (en) | 2010-04-28 |
EP1700410A1 (en) | 2006-09-13 |
EP2187558B8 (en) | 2019-01-23 |
EP2187558A2 (en) | 2010-05-19 |
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