A Centralized Edge Cooperative Caching Strategy for VANETs

With the development of intelligent transportation systems (ITS), edge cooperative caching (ECC) technology has been introduced into vehicular ad hoc networks (VANETs) to reduce the transmission delay of vehicle access data and improve network performance. ECC technology achieves faster and more efficient data retrieval by storing frequently accessed data at the network edge, especially for popular or time-sensitive content in VANETs. However, due to the limited caching resources, allocating storage resources for caching and deciding which data to cache becomes a challenge. This paper first proposes a vehicle-edge network model, and then based on this network model, proposes an optimization problem that minimizes the average transmission delay. To solve this optimization problem, we propose a centralized edge cooperative caching (CECC) strategy, which converts it into a multiple-choice knapsack (M CK) problem. Finally, we propose a greedy algorithm to obtain an approximate optimal solution to the MCK problem. Simulation results show that compared with existing ECC strategies, the CECC strategy can effectively improve caching performance.