Decentralized Dynamic Gate Scheduling of IEEE 802.1Qbv Time Aware Shaper and a TSN Simulator for Tactile Cyber-Physical Systems

摘要

Cybersickness and control-loop instabilities are two main concerns in Tactile Cyber-Physical Systems (TCPS). TCPS applications demand stringent bounds on end-to-end latencies to avoid their occurrences. Traditional best-effort networks cannot guarantee packet latencies in the presence of external traffic. On the other hand, emerging deterministic networks such as IEEE 802.1 Time Sensitive Networks (TSN) can isolate time-critical flows from external traffic using IEEE 802.1Qbv Time-Aware-Shaper (TAS) to guarantee bounded end-to-end packet latencies. In this work, we devise a decenteralized dynamic scheduling protocol to Configure non-overlapping gate slots in TAS enabled TSN switches to support TCPS flows. Our protocol supports plug-and-play operation of TCPS terminals with guaranteed minimal end-to-end packet latencies. Further, we also present PYTSN, an open-source discrete-event network simulator containing models of TAS enabled TSN switches and TCPS terminals. We use PYTSN to evaluate our proposed scheduling protocol. In particular, we show the isolation of TCPS flows from external traffic and plug and play operation of TCPS terminals.