JP4987346B2 - ネットワークを介した時間同期化システムおよび方法 - Google Patents
ネットワークを介した時間同期化システムおよび方法 Download PDFInfo
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- JP4987346B2 JP4987346B2 JP2006127556A JP2006127556A JP4987346B2 JP 4987346 B2 JP4987346 B2 JP 4987346B2 JP 2006127556 A JP2006127556 A JP 2006127556A JP 2006127556 A JP2006127556 A JP 2006127556A JP 4987346 B2 JP4987346 B2 JP 4987346B2
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- 238000000034 method Methods 0.000 title claims description 29
- 230000005540 biological transmission Effects 0.000 claims description 8
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- 230000007246 mechanism Effects 0.000 claims description 4
- 230000008569 process Effects 0.000 description 17
- 230000001360 synchronised effect Effects 0.000 description 12
- 230000001934 delay Effects 0.000 description 5
- 238000005259 measurement Methods 0.000 description 5
- 238000004891 communication Methods 0.000 description 4
- 238000004801 process automation Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
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- 238000012986 modification Methods 0.000 description 2
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
- H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
- H04J3/0658—Clock or time synchronisation among packet nodes
- H04J3/0673—Clock or time synchronisation among packet nodes using intermediate nodes, e.g. modification of a received timestamp before further transmission to the next packet node, e.g. including internal delay time or residence time into the packet
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/04—Generating or distributing clock signals or signals derived directly therefrom
- G06F1/14—Time supervision arrangements, e.g. real time clock
-
- G—PHYSICS
- G04—HOROLOGY
- G04G—ELECTRONIC TIME-PIECES
- G04G5/00—Setting, i.e. correcting or changing, the time-indication
-
- G—PHYSICS
- G04—HOROLOGY
- G04G—ELECTRONIC TIME-PIECES
- G04G7/00—Synchronisation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
- H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
- H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
- H04J3/0644—External master-clock
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
- H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
- H04J3/0658—Clock or time synchronisation among packet nodes
- H04J3/0661—Clock or time synchronisation among packet nodes using timestamps
- H04J3/0664—Clock or time synchronisation among packet nodes using timestamps unidirectional timestamps
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
- H04J3/0685—Clock or time synchronisation in a node; Intranode synchronisation
- H04J3/0697—Synchronisation in a packet node
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L7/00—Arrangements for synchronising receiver with transmitter
- H04L7/0008—Synchronisation information channels, e.g. clock distribution lines
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L7/00—Arrangements for synchronising receiver with transmitter
- H04L7/0008—Synchronisation information channels, e.g. clock distribution lines
- H04L7/0012—Synchronisation information channels, e.g. clock distribution lines by comparing receiver clock with transmitter clock
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Theoretical Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Synchronisation In Digital Transmission Systems (AREA)
- Small-Scale Networks (AREA)
Description
一実施形態においては、SG信号は、無線RF、ケーブルワイヤ、音声、振動、光のうちの選択された機構によって、クロックに送信される。また、一実施形態においては、SG信号は、電子カウンタ、局部発振器、PLL、周波数ジェネレータ、GPS受信機のうちの選択された機構によって生成される。
110 同期ジェネレータ
120、130 装置クロック
201 パケット
Claims (9)
- タイミング制御信号を実質的に同時に受信するようにそれぞれが構成された、ネットワークの送信側装置(12)および受信側装置(13)と、
前記送信側装置のコントローラ(121)であって、前記タイミング制御信号の受信に関連づけられた既知の定まった時間において、ネットワークを介して前記送信側装置から前記受信側装置に送信されるメッセージに、タイムスタンプを押すように動作可能であり、該タイムスタンプは、該送信側装置のエポックタイムである、コントローラと、
前記受信側装置のコントローラ(131)であって、受信した前記メッセージのうちの1つから、前記タイムスタンプが押されたエポックタイムと、該受信側装置における前記タイミング制御信号の受信の前記定まった時間から計算された通過時間とに基づいて、前記受信側装置のエポックタイムと前記送信側装置のエポックタイムとの間の差を求めるよう動作可能なコントローラと、
を備えるネットワーク同期化システム。 - 前記定まった時間は、前記送信側装置が前記タイミング制御信号を受信した際の時間である、
請求項1に記載のシステム。 - 前記送信側装置は、複数の前記受信側装置にメッセージを送信し、該メッセージのそれぞれは、該送信側装置のエポックタイムのタイムスタンプを運び、
前記メッセージのそれぞれは、前記タイミング制御信号の受信から、既知の異なるオフセットされた時点で送信される、
請求項1に記載のシステム。 - 前記受信側装置においてクロック(130)をさらに備え、
前記コントローラは、前記受信側装置のクロックのドリフトを調節するためにドリフト計算(314)を行い、該ドリフト計算は、前記求められたエポックタイムの差に基づく、
請求項1に記載のシステム。 - 前記タイミング制御信号は、無線RF、ケーブルワイヤ、音声、振動、光からなるリストから選択された機構によって、前記送信側装置および前記受信側装置に送信される、
請求項1に記載のシステム。 - 前記タイミング制御信号は、電子カウンタ、局部発振器、PLL、周波数ジェネレータ、GPS受信機からなるリストから選択された機構によって生成される、
請求項1に記載のシステム。 - 空間的に離れたネットワーク要素におけるクロックを同期化する方法であって、
実質的に同時にクロックに到着するインパルスを、複数の該クロックに送信するステップ(301、310)と、
前記クロックのうちの1つで前記インパルスが受信されると、送信側のクロック(120)のエポックタイムを有するメッセージを、ネットワーク装置(111)を介して、少なくとも1つのターゲットクロック(130)に送信するステップ(302)と、
前記メッセージをターゲットクロックで受信すると、該ターゲットクロックにおいて、前記タイムスタンプに含まれる前記送信側クロックのエポックタイムを使用して、該ターゲットクロックのエポックタイムと該送信側クロックのエポックタイムとの間の差を計算するステップ(314)と、
を含む、方法。 - 前記計算は、
前記ターゲットクロックのエポックタイムを前記送信側クロックのエポックタイムと比較するステップと、
前記タイムスタンプを運ぶメッセージのネットワーク通過時間に基づいて前記ターゲットクロックのエポックタイムを調節するステップと、
を含む、請求項7に記載の方法。 - 前記調節は、
前記インパルスの受信から、前記メッセージが前記ターゲットクロックに到着した時間までに経過した時間をカウントすることを含む、
請求項8に記載の方法。
Applications Claiming Priority (2)
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US11/127,354 | 2005-05-12 | ||
US11/127,354 US7573914B2 (en) | 2005-05-12 | 2005-05-12 | Systems and methods for synchronizing time across networks |
Publications (2)
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JP2006319972A JP2006319972A (ja) | 2006-11-24 |
JP4987346B2 true JP4987346B2 (ja) | 2012-07-25 |
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JP2006127556A Active JP4987346B2 (ja) | 2005-05-12 | 2006-05-01 | ネットワークを介した時間同期化システムおよび方法 |
Country Status (4)
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US (1) | US7573914B2 (ja) |
JP (1) | JP4987346B2 (ja) |
DE (1) | DE102006012466A1 (ja) |
GB (1) | GB2426164B (ja) |
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- 2006-03-17 DE DE102006012466A patent/DE102006012466A1/de not_active Ceased
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GB0607387D0 (en) | 2006-05-24 |
JP2006319972A (ja) | 2006-11-24 |
GB2426164B (en) | 2010-05-26 |
GB2426164A (en) | 2006-11-15 |
DE102006012466A1 (de) | 2006-11-16 |
US7573914B2 (en) | 2009-08-11 |
US20060256820A1 (en) | 2006-11-16 |
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