A DTN/VANET Message Dissemination Technique Using Car Platoon
Budi Rahmadya (1151206)




Currently, trac jams and accidents are common problems on highways in big
cities. In Japan, Intelligent Transport System (ITS) [1] has been used to alle-
viate these problems. This technology uses wireless communication for sharing
trac information among the roads and vehicles. Recently, usage of car naviga-
tion system is widespread, and Vehicular Ad Hoc Networks (VANETs) that use
multi-hop wireless communication among vehicles and devices on roadsides for
sharing information are paid attention. There have already been many research
publications for VANETs, that disseminate and share messages among vehicles.



Stable data transfer between two distant locations in a VANETs is inherently
dicult due to the high speed and unpredictable mobility of vehicles. In some
existing researches, a technique called a DTN (Disruption/Delay Tolerant Net-
work) is employed to improve the delivery rate of messages in VANETs. In a
DTN, no relaying node forwards a message if no suitable node is available for
receiving the message. The node forwards the message later when such a node
becomes available. In this way, a DTN can eciently deliver messages even in a
case with frequent network partitions.



In this thesis, we enhance our previous work [31], that transfers messages
from moving vehicles to a xed roadside location. We propose a new method
that combines multi-hop communication with our previous DTN technique. In
the proposed method, we assume that every vehicle is equipped with a naviga-
tion system, and the current position and the future route of every vehicle is
known. Vehicles periodically exchange route information, and forward messages
to vehicles that will get closer to the message destination according to the future
route information. The problem with this previous method is that each vehicle
only exchanges messages between neighboring vehicles, and thus the eciency of
message delivery was not high. In this thesis, we combine the idea of multi point
relays (MPR) in OLSR protocol with the previous method, and make vehicles
exchange messages between distant vehicles using multi-hop communication, and
improve the message exchange eciency.



We are going to implement our proposed method using the trac simulator
called SUMO [2] and evaluate the method by comparing the method with our
previous method.