Abstract:
Recent advancements in mobile communications, embedded systems, and sen-
sors lead to the design of intelligent vehicles. Such vehicles are able to establish
wireless communication among themselves, and this is called vehicular ad hoc net-
works. A plethora of applications covering safety, e ciency, and infotainment are
possible through the use of vehicular networks. Enhancing safety and e ciency
is the main goal of an intelligent transportation system (ITS). That is why it is
gaining much interest among the research community and automobile industries.
Safety-related messages need to propagate e ciently and reliably among mov-
ing vehicles to realize safety applications. Variable vehicle density and road topolo-
gies in vehicular networks raise many challenges for e cient message dissemina-
tion. Furthermore, vehicles must extend message awareness beyond the transmis-
sion range of the sending vehicles. The characteristics of vehicular networks, as
well as the need to disseminate safety messages over a greater distance, necessitate
e cient and reliable multi-hop communications.
The current thesis ts into this background and aims to investigate and pro-
pose novel and e cient data dissemination protocols, primarily addressing safety
applications via vehicle-to-vehicle communication. First, it provides a detailed
analysis of message dissemination protocols and their classi cations. The thesis
focuses on location-assisted message broadcasting for message dissemination tasks.
Native broadcasting methods result in high redundancy and channel contention.
Delay-based broadcasting techniques are e cient solutions to reduce excessive re-
dundancy and channel congestion. This work provides a comparative analysis of
di erent delay-based broadcast techniques.
Subsequently, an enhanced adaptive protocol design is presented that is ro-
bust against varying vehicle densities and road topologies. The proposed protocol
is scalable to accommodate diverse application requirements. Additionally, the
behaviour and e ectiveness of the proposed protocol are carefully examined in a
realistic environment.
