(河海大学 计算机与信息工程学院, 江苏 南京 210098)
Modeling the Vehicular Ad Hoc Networks Based on Topology Characteristics in Urban Scenario
ZHANG Li-Li,CHEN Hao,LI Chen-Ming,TAN Guo-Ping
(College of Computer and Information Engineering, Hohai University, Nanjing 210098, China)
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Received:May 02, 2013    Revised:August 22, 2013
> 中文摘要: 低碳生活和低能耗是当今的热门话题,对“绿色交通”的期待使得车辆自组网(vehicular ad hoc network,简称VANET)受到越来越多的关注和研究.而无线通信技术的快速发展和车辆的普及使车辆自组网的研究变得更加迫切和必要.提出以车辆自组网本身拓扑特点出发,通过对某些城市VANET 的实证研究来获得通用的网络特征和网络模型,进而解释网络行为和物理含义的新思路.基于此,利用4 000 多辆出租车收集的实时数据,分析了城市环境下车辆自组网的度分布、聚类系数、特征路径长度等拓扑特性.数据分析结果表明,城市环境下车辆自组网节点度服从幂率分布,且网络的整体和局部都具有较高的聚类系数.从分析结果出发结合复杂网络理论,建立了一种车辆自组网的网络模型,该模型从规则图出发,应用无标度网络和小世界网络的特性,将随机重连和优先连接原则应用于模型中,并设置模型的外部接口对网络模型进行控制和分析.最后,仿真验证了所建模型的有效性.为建立更有效的车辆自组网仿真平台提供了理论模型,同时有助于更好地控制网络拓扑.
Abstract:Nowadays, low-carbon life and low energy consumption are popular topics as more and more people are looking for "green transport". With the rapid development of wireless communication technology and the widespread adoption of vehicles in daily life, Vehicular ad hoc Network (VANET), as a new research hot spot, has attracted much attention. This paper proposes a new method to analyze VANET and explain network behavior with its physical meaning. Firstly, this paper models the VANET based on the topology characteristics which will be analyzed based on the real data collected by more than 4 000 taxis in Shanghai. The topology characteristics include degree distribution, clustering coefficient, characteristic path length and so on. The statistical analyses show the degree distribution follows the power law which is the classic characteristics of scale-free network in complex networks. It also reveals high clustering coefficient of VANET. Through combining the complex network theory and applying the small world model and scale free model, The paper builds a VANET model and create external interface to control the network. The simulations prove the effectiveness of our model, which helps us to build capable simulation platform of VANET with better network control.
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基金项目:国家自然科学基金(61003224, 61001068) 国家自然科学基金(61003224, 61001068)
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ZHANG Li-Li,CHEN Hao,LI Chen-Ming,TAN Guo-Ping.Modeling the Vehicular Ad Hoc Networks Based on Topology Characteristics in Urban Scenario.Journal of Software,2013,24(S1):51-61