Hybrid k-Preemptive Transmission Scheme for Minimal Age of Information in IoT Networks

This letter explores the Age of Information (AoI) in IoT networks, aiming to minimize the average AoI for real-time applications. We employ a spatiotemporal model with a heterogeneous Poisson field (HPF) of interferers and an absorbing Markov chain (AMC) to quantify AoI dynamics. This model specifically examines the effects of packet segmentation (i.e., rate adaptation) to maintain a stable rate in the presence of IoT interference. Unlike previous works focused on preemptive and non-preemptive schemes, we propose a novel hybrid k-preemptive transmission scheme. This scheme dynamically decides whether to continue or preempt transmission based on the number of delivered segments, addressing interference issues. Simulation results demonstrate the superiority of the proposed scheme over conventional schemes, consistently minimizing the average AoI.