Performance Modeling and Analysis of an MEC System With Task Priority and Expiring Time Constraint

This letter studies the performance modeling of a single-server MEC system with a task scheduling strategy that takes into account both the priority and time constraint of a computing task. A 3-D Markov chain is built to describe the queuing and processing process of computing tasks at an MEC server under the task scheduling strategy. Based on the Markov model, a theoretical model is further derived to analyze the performance of the system in terms of the average drop probability and average waiting time. The impacts of major parameters on the system performance are investigated based on the theoretical performance model.