Dynamic Topology Characteristics of VANETs in Fading Channels
Identifying the properties of the topology is critical to the development of the protocols for vehicular ad-hoc networks (VANETs).In VANETs,the propagation of radio waves in outside environment is easily affected by some obstacles like buildings.Therefore,the approach to model transmission ranges based on the geometric disk model is unscientific,especially in urban environments.The topology characteristics of VANETs taking into account the channel randomness are studied with complex networks in this paper.We assess the topology characteristics in the case of various vehicular densities and path loss exponent.The evaluated metrics are the degree,the clustering coefficient,and the global efficiency.It turns out that not only vehicular densities but also path loss exponents have an important effect on topology characteristics.By comparing the results obtained with the geometric disk model to those of fading channels models,we conclude that more optimistic but less reliable results on connectivity for VANETs are brought forth due to the ignorance of influences by obstacles.
vehicular ad-hoc networks dynamic topology fading channels complex network
Xu Youji Feng Huifang Liu Chunfeng
College of Mathematics &Statistics,Northwest Normal University Lanzhou,China Department of Computer Science,Tianjin University Tianjin,China
国际会议
重庆
英文
524-528
2016-03-20（万方平台首次上网日期，不代表论文的发表时间）