Asymptotic Throughput Capacity Analysis of VANETs Exploiting Mobility Diversity

作者：Wang, Miao; Shan, Hangguan^*; Luan, Tom H.; Lu, Ning; Zhang, Ran; Shen, Xuemin; Bai, Fan

来源：IEEE Transactions on Vehicular Technology, 2015, 64(9): 4187-4202.

DOI：10.1109/TVT.2014.2363791

• Asymptotic throughput capacity
• mobility diversity
• packet-forwarding scheme
• vehicular ad hoc network (VANET)

Vehicular ad hoc networks (VANETs) rely on intervehicle relay to extend the communication range of individual vehicles for message transmissions to roadside units (RSUs). With the presence of a large number of quickly moving vehicles in the network, the end-to-end transmission performance from individual vehicles to RSUs through intervehicle relaying is, however, highly unreliable due to the violative intervehicle connectivity. As an effort toward this issue, this paper develops an efficient message routing scheme that can maximize the message delivery throughput from vehicles to RSUs. Specifically, we first develop a mathematical framework to analyze the asymptotic throughput scaling of VANETs. We demonstrate that in an urban-like layout, the achievable uplink throughput per vehicle from vehicle to RSUs scales as Theta(1/log n) when the number of RSUs scales as Theta(n/ log n) with n denoting vehicle population. B y noting that the network throughput is bottlenecked by the unbalanced data traffic generated by hotspots of realistic urban areas, which may overload the RSUs nearby, a novel packet-forwarding scheme is proposed to approach the optimal network throughput by exploiting the mobility diversity of vehicles to balance the data traffic across the network. Using extensive simulations based on realistic traffic traces, we demonstrate that the proposed scheme can improve the network throughput approaching the asymptotic throughput capacity.

• 出版日期2015-9
• 单位浙江大学