Information Freshness of V2V Communication in Large-Scale Platooning System

Platooning system with Vehicle-to-vehicle (V2V) communication can offer the capability to adapt control strategies and uphold vehicle spacing through the exchange of vehicle status information. The stability of the platoon hinges on the promptness of transmitting vehicle status and control data. Yet, the currency of these data is significantly impacted by factors such as transmission interval and interference, particularly in large-scale networks. Diverging from much of the existing literature that predominantly addresses communication delay's impact on platoon stability, this study scrutinizes the freshness of V2V communication information and its ramifications on platoon stability across large-scale regions. Concretely, our work introduces a platooning control model grounded in a constant time gap policy that factors in the age of information (AoI) inherent in V2V communication. Subsequently, we construct a V2V communication model, accounting for the V2V packet transmission scheme and wireless resource allocation strategy. Through a fusion of queuing theory tool and stochastic geometry theory, we delve into the distribution of the average peak AoI (PAoI), unearthing insights into the prevalence of stable platoons in the network. Furthermore, simulation results elucidate the interplay between system parameters and platoon stability within this interconnected communication and control system.