부산대학교 도서관

The development of wireless communication systems has resulted in the availability of several access technologies in any geographical area, such as 3G networks, wireless local area networks (WLANs), and wireless broadband networks. The development of these technologies is provided for users who have experienced mobile network environments which are slow or fast with changes in distance between the Access Points (APs). This paper describes network performance issues in various environmental changes. Also, fuzzy logic is applied to evaluate the performance in vehicle networks around users' environmental factors to focus on minimizing transfer time and costs. First, WLAN and 3G networks with fixed distances between Aps are considered, followed by networks with random distances between APs. Finally, these two environments are analyzed with vehicle ad hoc networks. Vehicle to Infrastructure (V2I) and Vehicle to Vehicle (V2V) environmental conditions are assumed. The results based on fuzzy logic suggest optimal performance in vehicle network environments according to vehicle speed and distance between APs. The proposed algorithm shows 21% and 13% improvements in the networks performance in V2I and V2V environments, respectively.