Age of Information of an FCFS Queueing System in Heterogeneous Servers with Proactive Obsolete Packet Management
Y. Arun Kumar Reddy, Tiruchirai Gopalakrishnan Venkatesh · 2024
The Age of Information (AoI) is a metric in a remote monitoring system to evaluate the timeliness of status updates received at the destination.In this paper, we study the AoI and Peak AoI (PAoI) in a queueing system with two parallel heterogeneous servers and no extra buffer.Analyzing AoI or PAoI with a system having parallel heterogeneous servers is challenging because of the out-of-order reception of packets.We use the stochastic hybrid systems (SHS) approach to analyze the performance of the system.We study the system's performance under two different queueing disciplines: First Come First Serve (FCFS) and FCFS with probabilistic routing.We propose a novel methodology called "Proactive Obsolete Packet Management" denoted as "POPMAN," to proactively identify obsolete packets, thereby reducing server processing time and improving the AoI and PAoI of the system.We apply POPMAN technique to both FCFS and FCFS with probabilistic routing queueing systems.We observe that the proposed schemes exhibit improvement compared to traditional methods and also packets receive in order of reception.Our simulations are validated for various parameters, such as the packet dropping probability, the probability of obsolete packets, the probability that a packet is informative and optimal splitting probabilities.