| Summary: | 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.
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