FCSQF: Flexible Traffic Control for ECT-Aware Time Sensitive Networking

In Time Sensitive Networking, the sudden Event-triggered Critical Traffic (ECT) may have a negative impact on deterministic communication. Existing traffic models serve ECT with the FIFO principle, which incurs the competition between Time-triggered Critical Traffic (TCT) and ECT, and leads to high deadline missing ratio of ECT. To address this issue, we propose a traffic control scheme named FCSQF which serves ECT flexibly without affecting the normal deterministic communication of TCT. The key idea in FCSQF is that different ECT packets are pushed into different receiving queues to protect urgent packets with strict deadlines. Moreover, three techniques are used to process ECT packets for achieving low deadline missing ratio and high resource utilization, which are prudent pre-selection, proactive dropping and flexible enqueuing. Extensive experimental evaluation shows that, compared with the state-of-the-art design, FCSQF can have the deadline missing ratio decreased by 68.25% and the resource utilization ratio increased by 36.69%.