PSNVC: a novel physical-based VANET caching framework by integrating SDN and NDN paradigm

With the growing demand for on-board services, Vehicular Ad-hoc Network (VANET) caching technologies have attracted significant attention in both academia and industry. In VANET, vehicles request data by broadcasting to network nodes and caching the received data locally. However, the increasing variety of services, escalating data volumes, and the dynamic nature of VANET topologies pose challenges for traditional caching methods in providing high Quality of Service (QoS). This paper proposes a novel physical-based VANET caching framework, PSNVC, combining Software-Defined Network (SDN) and Named Data Network (NDN). PSNVC uses SDN controllers to distribute globally popular data, embeds an NDN-based request rebroadcast waiting time scheme in vehicle nodes, and adopts physical-based packets broadcasting strategies which is a new VANET caching framework to replace the conventional model. The PSNVC approach addresses the challenges posed by highly dynamic topologies and limited signal transmission ranges. Empirical simulations demonstrate that this method improves VANET caching performance by reducing link load by at least 33%, increasing the local satisfaction ratio by more than 10%, and maintaining the one-hop hit ratio.