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Timestamp-based clock recovery method and device

A technology of clock recovery and time stamping, which is applied to synchronization devices, time-division multiplexing systems, multiplexing communications, etc., and can solve problems such as the inability to respond quickly at the sending end and the impact of self-adaptive clock recovery at the sending end.

Active Publication Date: 2014-06-11
SANECHIPS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After studying the existing adaptive clock recovery technology, the inventor found that most of the existing technologies did not consider the impact of sudden changes in the frequency of the sending end on the adaptive clock recovery when implementing adaptive clock recovery, so the frequency of the sending end cannot be adjusted. React quickly to sudden changes

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  • Timestamp-based clock recovery method and device
  • Timestamp-based clock recovery method and device
  • Timestamp-based clock recovery method and device

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Embodiment Construction

[0057] The invention provides a time stamp-based clock recovery method and device, which can quickly react when the transmission frequency of the sending end changes during the clock recovery process. Moreover, the present invention further adopts a strategy of keeping the clock frequency constant for packet loss and out-of-sequence situations in the packet message transmission process, so that the influence of packet loss and out-of-order situations on the frequency recovery algorithm is greatly reduced.

[0058] The present invention will be further described through specific embodiments below in conjunction with the accompanying drawings.

[0059] The main idea of ​​the present invention is to regard the sending end, the receiving end and the PTN network as a "black box" (such as figure 1 As shown), when keeping the TDM service payload packet interval at the sending end equal to the ideal packet sending interval at the receiving end, the clock frequency of the TDM service a...

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Abstract

The present invention provides a method and an apparatus for clock recovery based on time stamps. The method includes that: a reception end receives packet messages, which are encapsulated with Time Division Multiplexing TDM service data, from a Package Transport Network PTN and records the reception time stamps of said packet messages; the reception end calculates and updates the clock frequency of the reception end according to the sending time difference between adjacent two packet messages and the Packet Delay Variation PDV of the packet messages transmission in a PTN. The present invention can track a sudden change of the frequency of the sending end and lock onto the sending frequency of the sending end quickly.

Description

technical field [0001] The invention relates to the technical field of circuit emulation of Time Division Multiplexing (TDM, Time Division Multiplexing) service data in the communication field, in particular to a time stamp-based clock recovery method and device. Background technique [0002] The TDM service is a common service in the communication field, such as a voice call. Leasing a TDM leased line for TDM service transmission usually requires expensive fees, and the resource utilization rate is not high. With the development of circuit emulation technology and packet transmission technology, in order to save costs and improve resource utilization, TDM services are usually grouped and packaged into edge-to-edge pseudowire emulation (PWE3, Pseudo Wire Emulation Edge) through circuit emulation technology. -to-Edge) packets are transmitted on the Packet Transport Network (PTN, Package Transport Network). [0003] When the TDM service is transmitted in the packet transport...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04J3/06H04L7/00
CPCH04J3/0664
Inventor 曾名志
Owner SANECHIPS TECH CO LTD