Latency characteristics analysis of express frames in TSN frame preemption

The frame preemption mechanism in Time-Sensitive Networking can effectively improve the transmission latency performance of express frames. However, in different network operating environments, express frame latency presents complex dynamic characteristics. In response to the complexity of express frame latency characteristics under frame preemption conditions, this article first analyzes the operation principle of the frame preemption mechanism and provides a calculation method for the latency of express frames. Then, considering the impact of link utilization and preemptable frame length on the average latency of express frames, we design a simulation analysis algorithm for the latency characteristics of express frames. Finally, using the proposed algorithm, we analyze the average latency, latency randomness, jitter, and latency boundary characteristics of express frames. The research results are valuable for engineering reference for the effective application of the TSN network frame preemption mechanism.