Configuration optimization for heterogeneous time-sensitive networks

Time-Sensitive Networking (TSN) collectively defines a set of protocols and standard amendments that enhance IEEE 802.1Q Ethernet nodes with time-aware and fault-tolerant capabilities. Specifically, the IEEE 802.1Qbv amendment defines a timed-gate mechanism that governs the real-time transmission of critical traffic via a so-called Gate Control List (GCL) schedule encoded in each TSN-capable network device. Most TSN scheduling mechanisms are designed for homogeneous TSN networks in which all network devices must have at least the TSN capabilities related to scheduled gates and time synchronization. However, this assumption is often unrealistic since many distributed applications use heterogeneous TSN networks with legacy or off-the-shelf end systems that are unscheduled and/or unsynchronized. We propose a new scheduling paradigm for heterogeneous TSN networks that intertwines a network calculus worst-case interference analysis within the scheduling step. Through this, we compromise on the solution’s optimality to be able to support heterogeneous TSN networks featuring unscheduled and/or unsynchronized end-systems while guaranteeing the real-time properties of critical communication. Within this new paradigm, we propose two solutions to solve the problem, one based on a Constraint Programming formulation and one based on a Simulated Annealing metaheuristic, that provide different trade-offs and scalability properties. We compare and evaluate our flexible window-based scheduling methods using both synthetic and real-world test cases, validating the correctness and scalability of our implementation. Furthermore, we use OMNET++ to validate the generated GCL schedules

Fault-tolerant Clock Synchronization using Precise Time Protocol Multi-Domain Aggregation

2021 IEEE 24th International Symposium on Real-Time Distributed Computing (ISORC