Yu, Danlei 2010-02 10313 https://aurora.ajou.ac.kr/handle/2018.oak/7078 학위논문(석사)--아주대학교 일반대학원 :컴퓨터공학과,2010. 2 Chapter 1 Introduction １ Chapter 2 Related Work 3 2.1 Research on Vehicular Ad Hoc Networks 3 2.2 Research on Delay/Disruption Tolerant Networks 6 2.3 Research on Opportunistic Forwarding 9 Chapter 3 Proposed Scheme 12 3.1 Data Requesting Phase 13 3.2 Data Reply Phase 14 3.3 Buffer Management 18 Chapter 4 Performance Evaluation 20 4.1 Simulation Parameters 20 4.2 Simulation Results 23 Chapter 5 Conclusion 26 LIST OF FIGURES Fig. 1 Real-time Information System 3 Fig. 2 Traffic Accident Detection and Report Mechanism 4 Fig. 3 The Basic Architectures of Vehicular Ad Hoc Network 5 Fig. 4 Division of Routing Techniques for Opportunistic Forwarding 9 Fig. 5 Real-time Data Requiring System 12 Fig. 6 Data Requesting Phase 14 Fig. 7 Vectors’ Angel Computation 15 Fig. 8 Multipath to Advantageous Neighbors 18 Fig. 9 Delivery Ratio vs Numbers of Nodes 24 Fig. 10 End-to-End Delay vs Numbers of Nodes 25 eng The Graduate School, Ajou University 아주대학교 논문은 저작권에 의해 보호받습니다. A New Opportunistic Forwarding Scheme for Effective Data Transmission in DTN-enabled Vehicular Ad Hoc Network Thesis 아주대학교 일반대학원 일반대학원 컴퓨터공학과 2010. 2 Master http://dcoll.ajou.ac.kr:9080/dcollection/jsp/common/DcLoOrgPer.jsp?sItemId=000000010313 New Opportunistic Forwarding Scheme DTN-enabled Vehicular Ad Hoc Network As the wireless communication technology develops rapidly and the cost of electronic components becomes cheaper, ubiquitous communication becomes practical in physical world. In this domain, Vehicular Ad Hoc Networks (VANETs) keep high research value. The studies on VANETs dedicate to implement safer and more convenient service and applications. Different from Mobile Ad Hoc Networks (MANETs), the characteristics of VANETs are fast vehicles movement, dynamic information exchange and relative high speed of mobile. In Car-to-Car and Car-to roadside communication, intermittent contact and highly changeable link are unavoidable, which cause poor performances in end-to-end delay and delivery ratio, especially in sparse networking conditions. In this study, we inlet Delay/Disrupted Tolerant Network (DTN) techniques into VANETs for better transmission quality in such periodic and disrupted networking. This thesis proposes an opportunistic forwarding scheme using vectors’ angle comparison. In DTN techniques, data is stored in buffer until it’s forwarded to next hop or directly to the destination. In our scheme, one or more advantageous neighbors are selected to carry the data. Briefly, we explored a vector based opportunistic forwarding scheme that integrates vectors’ angle, location, and motion potential to make an intelligent forwarding decision, which is called vehicle vector-based opportunistic forwarding (VVOF) in VANET. The simulation study conducted using Network Simulator 2 shows the effectiveness of the presented scheme.