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Open loop time delivering method

A time transfer and time technology, applied in transmission systems, digital transmission systems, electrical components, etc., can solve problems such as large one-way delay measurement error, inability to provide clock regeneration function, and complex time transfer interaction process.

Inactive Publication Date: 2006-08-16
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to solve the disadvantages of the current closed-loop time transfer method, such as large one-way delay measurement error, complex time transfer interaction process, and inability to provide the clock regeneration function required for synchronous testing, and proposes a method that does not require an independent transfer The open-loop time transfer method of the delay measurement process, in order to realize the time unification between the nodes of the network, the additional load on the network is small, and it has the ability of clock regeneration

Method used

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Embodiment Construction

[0067] figure 1 It is a schematic diagram of IEEE 1588 time synchronization system architecture. The time synchronization system consists of an IEEE 1588 switch and multiple IEEE 1588 time nodes. A boundary clock is configured in the switch, which is synchronized with the clock of the master station and serves as the master clock of the clock of the slave station at the same time. The time packets of the IEEE 1588 time synchronization system are not exchanged and transmitted through the switch, but the time transmission of each time node is realized through the boundary clock. IEEE 1588 time synchronization systems perform the synchronization process in two steps: First, the time difference between the master and slave is corrected (ie offset measurement). When correcting the offset, the master cyclically sends a synchronization message with an exact time estimate, which is sent at regular intervals to the relevant slaves. The slave then sends a delay request packet to the ...

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Abstract

The technical scheme is: a unified system is composed of multi time transfer chains; each time transfer chain consists of a master node, several switches and a slave node; SMAC are located in each switch and node; SMAC in master node generates synchronous frame, and broadcasts it to SMAC in slave node through the time transfer chain; the time transfer chain measures path time delay generated from transmission from SMAC in master node to SMAC in slave node; the path time delay is composed of the time delay of each chain and the time delay of each switch; the chain time delay is measured by using a measuring frame to take measurement at time of building a connection between a pair of SMAC; the switch time delay is measured by using a synchronous frame to take real-time measurement; the SMAC in slave node figures out its time warping with master node to implement correction of slave node time.

Description

technical field [0001] The invention relates to a method for time transfer in a network with a medium access control (MAC, Medium Access Controller) layer, especially for occasions with extremely high requirements for time synchronization of each node, such as a method for time transfer in a network of an industrial test environment and an automation system. Background technique [0002] MAC-based network technology has been rapidly developed and widely used. In order to realize business applications such as synchronous testing of different nodes, nodes need to be unified in time, especially with respect to a certain time standard. At present, many network-oriented time transfer methods have appeared, typical ones are NTP, SynUTC and IEEE 1588, etc. NTP is a network time protocol for wide area networks and local area networks. It works at the transport layer of the network. The time transfer accuracy is generally on the order of milliseconds (ms), and the protocol time overh...

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Application Information

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IPC IPC(8): H04L29/06H04L7/00H04L12/56
Inventor 王跃科明德祥杨俊乔纯捷陈建云钟小鹏潘仲明黄芝平
Owner NAT UNIV OF DEFENSE TECH
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