Adaptive duplication avoidance for Wi-Red

Seamless redundancy can be profitably applied to Wi-Fi networks to improve communication reliability and decrease transmission latencies, as required by industrial control applications, but it also doubles network traffic. Duplication avoidance mechanisms permit to sensibly lower spectrum consumption, by preventing unnecessary frame transmissions on air. In this paper, some adaptive techniques are described and preliminarily evaluated, which are aimed at improving performance of duplication avoidance heuristics based on packet deferral. In particular, two approaches are considered, where operating parameters like the deferral time or the primary channel are dynamically selected at runtime. Results show that improvements are possible, but not in every operating condition.