5. Load- and Mobility-Aware Cooperative Content Delivery in the SAGVN

In this chapter, we investigate cooperative content delivery in the mobile edge caching-assisted space–air–ground integrated vehicular networks (SAGVNs), where vehicular content requests can be simultaneously served by multiple APs in space, aerial, and terrestrial networks. To minimize the overall content delivery delay while satisfying vehicular quality-of-service (QoS) requirements, we formulate a joint optimization problem of vehicle-to-AP association, bandwidth allocation, and content delivery ratio, referred to as the ABC problem. To address the tightly coupled optimization variables, we propose a load- and mobility-aware ABC (LMA-ABC) scheme to solve the joint optimization problem. Specifically, we first decompose the ABC problem to optimize the content delivery ratio. Then the impact of bandwidth allocation on the achievable delay performance is analyzed, and an effect of diminishing delay performance gain is revealed. Based on the analysis results, the LMA-ABC scheme is designed with the consideration of user fairness, load balancing, and vehicle mobility. Simulation results demonstrate that the proposed LMA-ABC scheme can significantly reduce the cooperative content delivery delay comparing to the benchmark schemes.