A theoretical approach to optimal association control in vehicular Wi-Fi networks

摘要: The recent ubiquitous deployment of Wi-Fi access points (APs) has offered vehicles to use the high-speed and low-cost Internet service via roadside APs. However, high mobility limited coverage APs render some challenges. First, it results in frequent handoffs, thus leading long delay low availability. Second, available AP sets their channel quality change dynamically, making selection problem even harder. Therefore, there is a strong need develop an efficient association control mechanism that provides vehicular access. In this paper, we present theoretical framework formulate optimal through non-linear integer programming, whose objective function maximize throughput or minimize handoff overhead. We show holds totally unimodular (TU) property solvable polynomial time. Then, study optimality by comparing existing online algorithms real trace-based simulations. exists large performance gap between one. also observe algorithm can be further improved if future knowledge. Particularly, offline with information improves local up 10%.