Low-delay time-triggered network system and optimization method

Abstract

The invention provides a low time-delay time triggering network system and an optimization method. The method comprises steps that step 1, occupation applications are brought forward by multiple synchronization applications mounted on multiple single-core processors to a bus during arrival of a next self period; step 2, sequence determination of the occupation application of each synchronization application is carried out by the bus according to the set priority to acquire the data sending time of each synchronization application at a corresponding node ; and step 3, the time for forwarding the data from each node to the bus within a lowest common multiple period is recorded. Through the method, system end to end weight time-delay is substantially reduced, compared with a traditional method employing scheduling on the basis of an inherent period, a scheduling mode on the basis of the lowest common multiple period is employed, a system end to end weight time-delay sum can be reduced by 3.53%, and work efficiency of the bus employing a time triggering protocol is improved.

Description

technical field [0001] The invention relates to the technical field of bus transmission, in particular to a low-delay time trigger network system and an optimization method. Background technique [0002] For a system with a bus structure, since all nodes are connected together, in the process of transmitting information, the greatest impact on the end-to-end delay of information transmission is the occurrence of information sent by each node in the bus. collision. In order to reduce the collision rate of information during transmission, in the past few decades, the bus structure system has experienced from pure ALOHA protocol, slotted ALOHA protocol, carrier sense multiple access protocol, carrier sense multiple access / collision Avoid a series of development processes such as agreements. As the real-time requirements of industrial production are getting higher and higher, the subsequent time-triggered protocol can not only meet the real-time requirements of applications, b...

AI Technical Summary

Problems solved by technology

If all the data has been sent before the data with the shortest cycle is sent again, then the sending time of all data in each cycle can be the same as the initial sending time; but if the data with the shortest cycle is sent again, there is still time in the system If there is data that has not been transmitted yet, then these data are likely to give up the bus for the data sent again (higher priority), which leads to the fact that the sending time of the data in each cycle cannot be guaranteed to be the same as the initial sending time, which is different from the traditional scheduling way conflict

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