Abstract
The caching-assisted heterogeneous vehicular networks (HetVNets) are envisioned as a promising solution to support the ever-increasing vehicular applications. In this chapter, we investigate content caching in terrestrial HetVNets where Wi-Fi roadside units (RSUs), TV white space (TVWS) stations, and cellular base stations (CBSs) are considered to cache content files. To characterize the intermittent Wi-Fi and TVWS network connections, we establish an on–off model with service interruptions to describe the vehicular content delivery process. Content coding is then leveraged to resist the impact of unstable network connections with optimized coding parameters. By jointly considering the impact of file profiles and network characteristics, we investigate the content placement in heterogeneous APs to minimize the average content delivery delay, which is formulated as an integer linear programming problem. Adopting the idea of the student admission model, the formulated problem is then transformed into a many-to-one matching problem and solved by our proposed stable matching-based caching scheme. Simulation results demonstrate that the proposed scheme can achieve near-optimal performances in terms of delivery delay and offloading ratio with low complexity.
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