VANET路由协议设计时的网络容量仿真分析

针对车载自组网中节点移动速度快、拓扑变化频繁以及无线信道质量不稳定的特点,提出了此类网络的路由协议必须综合考虑业务需求、网络能力以及自组网本身的特点等因素的设计思想。分析了承载业务分为低速率的导频信道和高速率的业务信道对传输速率的不同要求,研究了在选择路由协议时的网络容量上、下限问题。仿真实验结果表明,节点的可行吞吐量的上下限将随着无线电波衰减系数和节点带宽的增大而增大。在车载自组网路由协议设计时需要考虑这种关系,从而提高节点的可行吞吐量。

Network Capacity Simulation in Design of VANET Routing Protocol

Aiming at VANET (Vehicular Ad-hoc Networks) characteristics of fast moving nodes, frequently varying topological structures and instable wireless channel quality, this paper proposes a design idea that the factors such as business demands, network abilities and VANET features should be considered comprehensively in the design of VANET routing protocol. Various demands of transmission rate for loading business low-rate pilot channel and high-rate traffic channel are analyzed, and meanwhile the upper and lower bounds of network capacity in choosing routing protocol are explored. Simulation results show that the practical bound of the node throughput increases with the growth of radio waves attenuation coefficient and node bandwidth. This situation should be considered in the design of the VANET routing protocols, so as to improve the viable throughput of the nodes.