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.