Method suitable for monitoring inside compression master and capable of improving clock synchronization fault tolerance

A technology for compressing the main controller and clock synchronization, which is applied in the field of network communication, can solve the problems of no replacement algorithm failure, the impact of global clock synchronization, etc., and achieve the effect of saving resources, improving system stability, and occupying less resources

Active Publication Date: 2014-08-27
BEIHANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, for the synchronous core computing node—the Compression Master (CM), there is no better replacement algorithm to deal with failures except for the dual redundancy mechanism.
Especially when there is no dual redundant structure, the failure of CM will have a great impact on the global clock synchronization

Method used

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  • Method suitable for monitoring inside compression master and capable of improving clock synchronization fault tolerance
  • Method suitable for monitoring inside compression master and capable of improving clock synchronization fault tolerance
  • Method suitable for monitoring inside compression master and capable of improving clock synchronization fault tolerance

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Experimental program
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Effect test

Embodiment 1

[0068] Combine below Figure 4A The example in the present invention is described further. Figure 4A Shown in is the relationship between the acceptance window of the compression main controller and the redundancy acceptance window proposed by the present invention.

[0069] Such as Figure 4A : When the compression master CM starts the i=10th clock synchronous synthesis cycle, the initial local clock is recorded as t 0 = 0, the synchronization period TSC = 1000us, the maximum possible transmission delay of the network is D max = 250us, the inherent overhead of the compression function of the compression controller is T co =10us; the set synchronization time precision P=1us, then compress the time point t when the main controller CM schedules sc = t 0 +D max +T co =260us, the acceptance window of the compression main controller CM is recorded as AW CM ,and

[0070] AW CM =[t sc -P,t sc +P]=[259us,261us], the best protocol control frame PCF best present in the AW ...

Embodiment 2

[0082] Combine below Figure 5B The example in the present invention is described further. Figure 5B Shown in is the relationship between the acceptance window of the compression main controller and the redundancy acceptance window proposed by the present invention.

[0083] Such as Figure 5B : When the compression master CM starts the i=10th clock synchronous synthesis cycle, the initial local clock is recorded as t 0 = 0, the synchronization period TSC = 1000us, the maximum possible transmission delay of the network is D max = 250us, the inherent overhead of the compression function of the compression controller is T co =10us; the set synchronization time precision P=1us, then compress the time point t when the main controller CM schedules sc = t 0 +D max +T co =260us, the acceptance window of the compression main controller CM is recorded as AW CM ,and

[0084] AW CM =[t sc -P,t sc +P]=[259us,261us], the best protocol control frame PCF best present in the AW ...

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Abstract

The invention discloses a method suitable for monitoring inside a compression master and capable of improving clock synchronization fault tolerance. The method includes the steps that firstly, a clock correction reference value and the optimal protocol control frame corresponding to the clock correction reference value are recorded; secondly, a comprehensive cycle value is extracted from the optimal protocol control frame, and whether the comprehensive value is the same as the frequency of cycles or not is judged; finally, according to the judgment whether the clock correction reference value falls inside a monitoring redundancy receiving window, the compression master is judged, and then the distribution moment of the optimal protocol control frame is determined. According to the method, synchronization information of the local clock is corrected through monitoring the compression master, the synchronization history of the compression master is recorded, under the emergency condition of judgment, historical state information can be issued, original fault information is supplemented, additional information is provided for distributed judgment, depending on a distributed clock synchronization algorithm, the fault tolerance capacity of the compression master is improved, and the immunity, resisting to transient failures, of a system is improved. The method and a physical multi-redundancy mechanism can further supplement each other, reasonable scheme combinations are adopted for different application scenes, and on the basis of optimizing resource consumption, the fault tolerance capacity of the system is guaranteed.

Description

technical field [0001] The invention relates to an internal monitoring processing method applied to time-triggered Ethernet, more particularly, a method implemented inside a compression main controller and capable of enhancing clock synchronization fault tolerance. The method enhances the clock synchronization fault-tolerant ability, can enhance the reliability of the time-triggered Ethernet, and belongs to the technical field of network communication. Background technique [0002] Time-triggered Ethernet (Time-Triggered Ethernet, TTE) is a technology to realize time-triggered communication in the field of switched interconnection real-time communication, which can provide microsecond-level distributed clock synchronization service, and has been used in NASA's manned spacecraft project Obtain practicality, and get the attention of foreign aircraft equipment design and manufacturing enterprises. [0003] In a distributed system, time-triggered communication depends on a stri...

Claims

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Application Information

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IPC IPC(8): H04L12/26G06F1/14H04J3/06
Inventor 李峭兰杰熊华钢王梦迪
Owner BEIHANG UNIV
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