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End-to-end transmission delay carrying measurement method of data network message

A data network and transmission delay technology, applied in the field of data communication, can solve the problems of not being suitable for measuring the time of a single message, affecting the distribution and reliability of the system, and high cost

Inactive Publication Date: 2014-02-26
王剑
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The former needs to recover the clock from the physical signal, which is costly; the latter relies on the master-slave centralized mode to affect the distribution and reliability of the system, and is not suitable for measuring the time for a single message to pass through the data network

Method used

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  • End-to-end transmission delay carrying measurement method of data network message
  • End-to-end transmission delay carrying measurement method of data network message
  • End-to-end transmission delay carrying measurement method of data network message

Examples

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Embodiment Construction

[0026] Taking the Ethernet data network composed of Ethernet switches as an example, the method of carrying time information in the tested message adopts the method of adding 7 bytes to the beginning of the user data in the Ethernet message, of which the first 4 records the current total transmission delay , the last three records record the time when the message enters the switch, both areas use an unstructured method to directly record relevant time information, and the unit is nanoseconds. The total transmission delay can be recorded for a maximum of 4 seconds, which is greater than the end-to-end delay of the packet usually passing through the network. The time part of the message entering the device can record up to 8388608 nanoseconds, which is equal to the maximum rollover time of the local time counter. For the convenience of illustration, this example assumes that the Ethernet packet under test is still smaller than or equal to the MTU requirement of the Ethernet prot...

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Abstract

By carrying in a message to be measured a staying accumulative delay information of the message in all current paths, accumulative transmission delay information (or current accumulative total delay, i.e., the sum of staying delay and link delay) of all path links and time information about the moment the message enters current equipment, and adopting a local unified clock in the current data network equipment to measure the entering time and the leaving time of the message, the invention realizes a method for dynamically measuring the staying delay and end-to-end transmission delay of a single message in real time in the data network equipment in a data network. The end-to-end transmission delay carrying measurement method of a data network message can be applied to any data network in which transmission delay of links is fixed, and to any data network including all seven layers of an OSI, and the data network can be a network formed by independent data network equipment and links, and can also be a network formed by connection of modules in equipment through a circuit board that realize a data network communication protocol function. The end-to-end transmission delay carrying measurement method of the data network message provides a new approach for realization of full-distribution type time synchronization and a full-distribution control system.

Description

technical field [0001] The invention belongs to the field of data communication technology and the field of industrial control technology. technical background [0002] Data network communication or industrial control has time and clock synchronization requirements between devices (or functional modules) in different locations or requirements for information transmission delay between different devices (or modules). These devices or (functional modules) will communicate using a suitable data communication network to realize the distribution of the system. Existing data network time or clock synchronization and real-time measurement technologies mainly use physical layer clock transmission such as synchronous Ethernet or SDH, or use centralized data network time service methods such as NTP or PTP. The former needs to recover the clock from the physical signal, which is costly; the latter relies on the master-slave centralized mode, which affects the system distribution and r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L7/00
Inventor 王健
Owner 王剑
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