Deadline-Aware Scheduling for Maximizing Information Freshness in Industrial Cyber-Physical System

"Age of Information" is an interesting metric that captures the freshness of information in the underlying applications. It is a combination of both packet inter-arrival time and packet transmission delay. In recent times, advanced real-time systems rely on this metric for delivering status updates as timely as possible. This article aims to accomplish optimal transmission scheduling policy to maintain the information freshness of real-time updates in the industrial cyber-physical systems. Here, the coexistence of both cyber and physical units and their individual requirements to provide the quality of service is one of the most critical challenges to handle. A greedy scheduling policy called Deadline-aware Highest Latency First has been proposed for this purpose. This article also gives the analytical proof of its optimality, and finally, the claim is validated by comparing the performance of our algorithm with other scheduling policies by extensive simulations.