Modelling, analysis and performance improvement of an SRUs access request queue in multi-channel V2I communications
This paper presents a concise yet comprehensive description of a multi-channel Vehicle-to-Infrastructure (V2I) communication system. Existing mathematical models for such a system overlook some of its essential behavioural characteristics such as the reneging, force-termination and ultimately blocking of service requests. A multi-server queueing model with First-InFirst-Out (FIFO) service policy is proposed for the purpose of accurately capturing the dynamics of the above-mentioned communication system and evaluating its performance. Approximations were exploited as a mean to enhance this models mathematical tractability. Simulations are conducted in the context of a realistic scenario with the objective of validating the proposed approximate model, verifying its accuracy and characterizing the systems performance in terms of several new metrics. The reported results indicate a cataclysmic access request blocking probability ranging from 66% 66 % to 85% 85 % . An Access Request Deadline-Aware (ARDA) service policy is then proposed to reduce the blocking probability and improve the systems response time. Indeed ARDA achieved an improvement over FIFO of almost 70% 70 % in terms of the overall blocking probability and 22% 22 % to 66% 66 % in terms of the systems response time.
modelling performance v2i