A link delay compensation method and device

Abstract

Embodiments of the present invention provide a link time delay compensation method and device, which are applied in the field of communication, and can enable routers to automatically perform time delay adjustment and improve the synchronization accuracy of communication services. The link delay compensation method includes: acquiring a first link between the first router and the second router, the first link being an uplink or downlink between the first router and the second router link, the second router is time-synchronized with the clock source of the communication network; according to the link delay table stored in the first link and the first router, the time of the first link is calculated Delay: adjust the time of the first router according to the delay of the first link, so that the time of the first router is synchronized with the time of the second router. Embodiments of the present invention provide a link delay compensation method and device, which are used for automatic adjustment of link delay.

Description

Technical field [0001] The present invention relates to the field of communications, in particular to a method and device for link delay compensation. Background technique [0002] With the development of packetized communication networks, communication networks have higher and higher requirements for the synchronization of system components. The timing signals of the communication parties need to comply with a specific frequency or phase relationship, that is, two or more signals are effective in the corresponding In an instant, the phase difference or frequency difference remains within the agreed allowable range. Synchronization can be divided into clock synchronization (also called frequency synchronization) and time synchronization (also called phase synchronization). [0003] Currently, IEEE (Institute of Electrical and Electronics Engineers, Institute of Electrical and Electronics Engineers) has proposed 1588v1 and 1588v2 in order to achieve time synchronization. Among the...

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Problems solved by technology

However, when the time synchronization requirements are implemented through the 1588v2 protocol, the two-way delay between the master and slave devices must be strictly the same, so it is necessary to make the link lengths of the uplink and downlink between the master and slave devices the same as much as possible during project laying. Errors will inevitably occur during engineering construction, and in practical applications, business cutover or service switching will often result in different link lengths in the two directions, resulting in different two-way delays between the master and slave devices , affecting the synchronization accuracy

In practical applications, due to natural disasters, external construction, etc., one of the two-way links between the master and slave equipment is disconnected. At this time, the action of switching the service of the disconnected link to the backup link is called service switching. Service switching may make the two-way link delay between the master and slave devices unequal; the action of operating the line or device in use is called service cutover, and the service cutover will also affect the services carried on the link, which may Make the two-way link delay between the master and slave devices unequal

In the prior art, if the two-way delay between the master and slave devices is not equal, it is usually necessary to manually re-measure to confirm the two-way delay difference and set the delay correction value, which usually takes a long time and affects Synchronization accuracy of communication services

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