Low-delay zero-jitter hybrid time-sensitive traffic scheduling method and device

Abstract

The invention provides a low-delay zero-jitter hybrid time-sensitive traffic scheduling method and device. According to the method, a novel wait-free shaper and a circular queuing shaper are adopted, and the wait-free shaper can realize zero-jitter transmission of synchronous streams by strictly limiting the transmission time of the streams on each output port and each period to be not overlapped. According to the method provided by the invention, the following technical problems can be solved: a wait-free shaper is provided to eliminate 2T-size transmission jitter and realize zero-jitter transmission isochronous traffic; a circular queuing reshaper based on a circular queuing forwarding mechanism is provided, and low-delay transmission period flow is realized; a time-aware circular queuing mechanism is provided, and a wait-free shaper and a circular queuing shaper are fused, so that the common network transmission of a periodic stream and an isochronous stream is realized.

Description

technical field [0001] The invention relates to the technical field of cyber-physical systems, in particular to the field of a hybrid time-sensitive traffic scheduling method. Background technique [0002] In many cyber-physical systems (CPS), such as industrial automation and in-vehicle networking systems, traditional proprietary bus-based networking techniques cannot meet the high bandwidth and deterministic latency requirements of real-time applications. To meet high bandwidth demands, standard Ethernet is the most promising solution. However, Ethernet was originally designed to provide only best-effort forwarding services, which results in non-deterministic queuing delays. In order to meet deterministic latency requirements while transporting time-sensitive and best-effort traffic on a network, there is an urgent need to improve the deterministic latency guarantee capability of Ethernet. [0003] One of the promotion mechanisms is the cyclic queuing and forwarding mech...

AI Technical Summary

Problems solved by technology

[0005] Although there are many traffic scheduling solutions for time-sensitive networks, they usually ignore the mixed flow scheduling problem of CQF and cannot meet the goal of low-latency zero-jitter transmission

For example, a time-aware shaper (TAS) with a wait-free packet scheduling model can schedule isochronous flows, but allocating time slots for each packet requires complex configuration and huge network overhead for gating lists; the injection time scheduling mechanism is achieved by CQF is implemented by mapping the injection time of periodic flows to queue resources, which simplifies the configuration of the gating list, but does not consider isochronous flows; in addition, many solutions only consider periodic flows under the time-aware shaping mechanism, rate-limited flows Mixed flow scheduling of best-effort flow and best-effort flow, so it is not suitable for circular queuing and forwarding mechanism

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