WO1998006194A1 - Procede et dispositif de synchronisation d'horloge de reseau - Google Patents
Procede et dispositif de synchronisation d'horloge de reseau Download PDFInfo
- Publication number
- WO1998006194A1 WO1998006194A1 PCT/US1997/013555 US9713555W WO9806194A1 WO 1998006194 A1 WO1998006194 A1 WO 1998006194A1 US 9713555 W US9713555 W US 9713555W WO 9806194 A1 WO9806194 A1 WO 9806194A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- node
- rate adjustment
- adjustment factor
- synchronization
- time
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims abstract description 46
- 230000001360 synchronised effect Effects 0.000 claims abstract description 29
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- 238000004891 communication Methods 0.000 claims description 29
- 230000006870 function Effects 0.000 claims description 21
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Classifications
-
- 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
Definitions
- each node on the bus network 20, whether a bridge 26 of a personal computer 22 or a device interface 35 of an electronic device 28, is equipped with a time synchronization circuit 43 and an internal clock 42.
- the internal clock 42 generates clock pulses at a frequency of approximately 10 MHz.
- first field 66 identifies the packet as a synchronization packet.
- a second field 68 identifies the source node sending the synchronization packet, i.e., the lowest numbered node.
- a third field 70 contains a snapshot of the time value in microseconds at which the synchronization packet 64 was transmitted by the lowest numbered node. Further, the third field 70 contains a synchronization interval, Sp, which is determined by the overlying network protocol to be the time interval between transmission of synchronization packets 64.
- the STR 94 provides overlying applications with a means to schedule certain events.
- a value representing the scheduled time of a particular function will be stored in the STR.
- a software interrupt will be initiated indicating to the overlying network protocol that the particular function may be performed.
- the synchronization monitor task illustrated in FIGURE 6 is interrupted and the packet processing routine illustrated in FIGURES 7A-7C is implemented by the node.
- the logic begins in a block 130.
- the logic proceeds to a decision block 134 where it determines if the SyncRxState variable is equal to 0, i.e., if the node has yet to receive its first synchronization packet after startup. If the result is negative, the receiving node has already received a synchronization packet 64 and the initialization has already been completed.
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Synchronisation In Digital Transmission Systems (AREA)
- Data Exchanges In Wide-Area Networks (AREA)
Abstract
Chacun des noeuds d'une pluralité de noeuds communiquant les uns avec les autres par l'intermédiaire d'un réseau (20) est pourvu d'un circuit de synchronisation temporelle (43) servant à synchroniser les valeurs temporelles détenues par chaque noeud du réseau (20). Chaque noeud comprend une mémoire à accès sélectif RAM (40 ou 62) et une mémoire ROM effaçable électroniquement (38 ou 63), une horloge interne (42) et une unité de traitement (36 ou 60) couplée électroniquement à l'horloge (42) et (a) d'inciter le noeud à déterminer si le noeud est un noeud unique basé sur un protocole prédéterminé et, si le noeud est un noeud unique, à inciter ce noeud à générer et à transmettre des paquets de synchronisation (64) aux autres noeuds reliés au réseau (20) et (b) de traiter tout paquet de synchronisation reçu (64), de manière à régler la cadence à laquelle la valeur temporelle détenue par le noeud est incrémentée en réaction à des impulsions provenant de l'horloge (42), de façon à synchroniser la valeur temporelle détenue par le noeud sur la valeur temporelle détenue par le noeud unique. Le circuit de synchronisation temporelle comprend une partie temps synchronisée (99), une partie réglage de cadence (92) et une partie rythmeur (82). La partie temps synchronisée maintient la valeur temporelle du noeud. La partie réglage de cadence reçoit un facteur de réglage de cadence calculé par le processeur et utilise ce facteur afin de régler la cadence à laquelle la valeur temporelle maintenue par la partie temps synchronisée est incrémentée. La partie rythmeur reçoit un intervalle temporel de calcul local calculé par le processeur et transfère le facteur de réglage de cadence vers la partie de cadence à l'expiration de l'intervalle temporel de calcul local.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US69148796A | 1996-08-02 | 1996-08-02 | |
| US08/691,487 | 1996-08-02 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO1998006194A1 true WO1998006194A1 (fr) | 1998-02-12 |
Family
ID=24776730
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/US1997/013555 WO1998006194A1 (fr) | 1996-08-02 | 1997-08-01 | Procede et dispositif de synchronisation d'horloge de reseau |
Country Status (1)
| Country | Link |
|---|---|
| WO (1) | WO1998006194A1 (fr) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2341749A (en) * | 1998-09-19 | 2000-03-22 | Nokia Telecommunications Oy | Digital network synchronisation |
| GB2356774A (en) * | 1999-11-26 | 2001-05-30 | Roke Manor Research | Synchronisation of base stations |
| EP2034642A1 (fr) * | 2007-09-07 | 2009-03-11 | Siemens Aktiengesellschaft | Procédé destiné à la transmission d'informations de synchronisation dans un réseau de communication |
| US7613212B1 (en) * | 2003-06-10 | 2009-11-03 | Atrica Israel Ltd. | Centralized clock synchronization for time division multiplexed traffic transported over Ethernet networks |
| CN111343039A (zh) * | 2018-12-18 | 2020-06-26 | 西蒙兹精密产品公司 | 用于异步通信系统的分布式时间同步协议 |
| CN117289754A (zh) * | 2023-08-22 | 2023-12-26 | 北京辉羲智能科技有限公司 | 一种时间同步的芯片架构及其软件控制方法 |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4713807A (en) * | 1985-05-24 | 1987-12-15 | Stc Plc | Intelligence transmission system of the local area network type |
| US4893318A (en) * | 1988-01-26 | 1990-01-09 | Computer Sports Medicine, Inc. | Method for referencing multiple data processors to a common time reference |
| US4939752A (en) * | 1989-05-31 | 1990-07-03 | At&T Company | Distributed timing recovery for a distributed communication system |
| US5023871A (en) * | 1988-04-28 | 1991-06-11 | Hitachi, Ltd. | Method of controlling the operation of stations in a ring network |
| EP0450879A1 (fr) * | 1990-04-04 | 1991-10-09 | Hunting Communication Technology Limited | Systˬme de communication en anneaux |
| EP0722233A2 (fr) * | 1994-12-21 | 1996-07-17 | Hewlett-Packard Company | Synchronisation dans un réseau de communication de données |
-
1997
- 1997-08-01 WO PCT/US1997/013555 patent/WO1998006194A1/fr active Application Filing
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4713807A (en) * | 1985-05-24 | 1987-12-15 | Stc Plc | Intelligence transmission system of the local area network type |
| US4893318A (en) * | 1988-01-26 | 1990-01-09 | Computer Sports Medicine, Inc. | Method for referencing multiple data processors to a common time reference |
| US5023871A (en) * | 1988-04-28 | 1991-06-11 | Hitachi, Ltd. | Method of controlling the operation of stations in a ring network |
| US4939752A (en) * | 1989-05-31 | 1990-07-03 | At&T Company | Distributed timing recovery for a distributed communication system |
| EP0450879A1 (fr) * | 1990-04-04 | 1991-10-09 | Hunting Communication Technology Limited | Systˬme de communication en anneaux |
| EP0722233A2 (fr) * | 1994-12-21 | 1996-07-17 | Hewlett-Packard Company | Synchronisation dans un réseau de communication de données |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2341749A (en) * | 1998-09-19 | 2000-03-22 | Nokia Telecommunications Oy | Digital network synchronisation |
| GB2356774A (en) * | 1999-11-26 | 2001-05-30 | Roke Manor Research | Synchronisation of base stations |
| US7613212B1 (en) * | 2003-06-10 | 2009-11-03 | Atrica Israel Ltd. | Centralized clock synchronization for time division multiplexed traffic transported over Ethernet networks |
| EP2034642A1 (fr) * | 2007-09-07 | 2009-03-11 | Siemens Aktiengesellschaft | Procédé destiné à la transmission d'informations de synchronisation dans un réseau de communication |
| US7848360B2 (en) | 2007-09-07 | 2010-12-07 | Siemens Aktiengesellschaft | Method for transmitting synchronization messages in a communication network |
| CN111343039A (zh) * | 2018-12-18 | 2020-06-26 | 西蒙兹精密产品公司 | 用于异步通信系统的分布式时间同步协议 |
| CN111343039B (zh) * | 2018-12-18 | 2024-05-28 | 西蒙兹精密产品公司 | 通信同步方法及分布式获取系统中的节点 |
| CN117289754A (zh) * | 2023-08-22 | 2023-12-26 | 北京辉羲智能科技有限公司 | 一种时间同步的芯片架构及其软件控制方法 |
| CN117289754B (zh) * | 2023-08-22 | 2024-06-07 | 北京辉羲智能科技有限公司 | 一种时间同步的芯片架构及其软件控制方法 |
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