Control frame compression method based on AS6802 protocol

Abstract

The invention discloses a control frame compression method based on an AS6802 protocol, and the problem that a time-triggered Ethernet and a device to be synchronized cannot be synchronized due to a slow compression speed in the prior art is mainly solved. The implementation scheme comprises the steps that: (1) a time-triggered Ethernet system port receives synchronization protocol control PCF frames and extracts port numbers, (2) parsing data fields of the synchronization protocol control PCF frames, screening the PCF frames and carrying out curing operation on the PCF frames obtained after the screening to obtain curing time points, (3) carrying out pre-integration of the curing time points to obtain member vectors with the same arrival time of curing completion signals, (4) collecting the curing time points and performing compression operations to obtain compression time points, and forwarding the compression time points to devices to be synchronized. According to the control framecompression method, through the pre-integration of the received synchronization protocol control PCF frames, the compression rate and the reliability of the system clock synchronization are improved,and the method can be used for the clock synchronization between a time-triggered Ethernet system and the devices to be synchronized.

Description

technical field [0001] The invention belongs to the technical field of communication, and further relates to a method for compressing a control frame, which can be used for time-triggered clock synchronization between an Ethernet system and a device to be synchronized. Background technique [0002] With the rapid development of distributed systems, the real-time, reliability, and high security requirements for data interaction between network devices in the system are more urgent. Traditional Ethernet technology can no longer support application services that meet these requirements. The time-triggered Ethernet TTE is compatible with time-triggered technology and traditional Ethernet technology, and has become the real-time network technology with the most development potential. TTE not only has the high real-time and comprehensive fault-tolerant mechanism of time-triggered technology, but also inherits the flexibility and high bandwidth of ordinary Ethernet. It is widely us...

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Problems solved by technology

The compression process of this method is mainly to open the compression function parallel to the synchronous protocol control frames of different cycles, and carry out the compression operation simultaneously, and its main deficiency is: when a plurality of synchronous protocol control frames arrive, need to open a plurality of compression functions simultaneously to carry out Calculation consumes a lot of system resources, and the compression function cannot be reused, so it cannot guarantee that all synchronization protocol control frames can be compressed in time, which greatly reduces the synchronization accuracy of the clock

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