Design of Emergency Message Forwarding Mechanisms towards a Roadside Unit or a Specific Area in VANETs.

• Main Authors: Yu-Wei Yang, 楊育維
• Other Authors: Huei-Wen Ferng
• Format: Others
• Language: zh-TW
• Published: 2017
• Online Access: http://ndltd.ncl.edu.tw/handle/j39dkh

碩士 === 國立臺灣科技大學 === 資訊工程系 === 105 === In a vehicular ad hoc network (VANET), the vehicle can avoid the occurrence of secondary accidents through the emergency message forwarding when an accident occurs to enhance the safety on roads. However, the traditional unlimited broadcast will cause the so-called broadcast storm, making the overall network performance poor. Therefore, we aim at lowering the number of packets to be transmitted by proposing a new direction in our design. When an emergency occurs, the emergency message will be forwarded to the nearest roadside unit (RSU) connected to the backhaul network to take countermeasures. In addition, the emergency message forwarding mechanism can be extended to reach a specific area. When the vehicle receives an emergency message and it is located in an appropriate area, it starts to calculate the waiting time through the list of neighbors. The better the condition is, the shorter the waiting time is. When the time is up, it broadcasts the packet. If the other nodes still waiting for broadcasting receives the packet, it ceases the transmission of the packet to mitigate the broadcast storm. Finally, we show the superiority of our design over some related mechanisms in the literature in terms of amount of packets transmitted via simulations. This definitely show the ability of broadcast storm supression and saving of network resources exhibited by our proposed mechanisms.