The number of neighbors needed for connectivity of wireless networks
Wireless Networks
Broadcast reception rates and effects of priority access in 802.11-based vehicular ad-hoc networks
Proceedings of the 1st ACM international workshop on Vehicular ad hoc networks
VanetMobiSim: generating realistic mobility patterns for VANETs
Proceedings of the 3rd international workshop on Vehicular ad hoc networks
Multi-metric Routing Decisions in VANET
DASC '09 Proceedings of the 2009 Eighth IEEE International Conference on Dependable, Autonomic and Secure Computing
BonnMotion: a mobility scenario generation and analysis tool
Proceedings of the 3rd International ICST Conference on Simulation Tools and Techniques
Enhancing VANET Performance by Joint Adaptation of Transmission Power and Contention Window Size
IEEE Transactions on Parallel and Distributed Systems
Principles and protocols for power control in wireless ad hoc networks
IEEE Journal on Selected Areas in Communications
CARS: Context-Aware Rate Selection for vehicular networks
ICNP '08 Proceedings of the 2008 IEEE International Conference on Network Protocols
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The key benefit of VANETs comes in the form of safety applications. Broadcast is the predominant form of communication for safety messages. However, due to the fast changes occurring in the network topology (sparse, dense, congested), vehicles within a VANET may face many disturbances such as collisions which can cause performance degradations. Thus it becomes hard to maintain an efficient channel utilization and so maximize the network capacity. In this paper, the idea is to take into account the dynamically changing topology of a VANET (local traffic density) and have each vehicle able to dynamically adapt its PHY QoS-parameter (Transmit Power) according to its fast changing channel conditions, network load, and link quantities of upper-layers. The proposed mechanism, called Transmit Power Adaptation (TPA) relies on channel estimate at PHY layer and uses feedback from an adaptive beaconing system (also presented) which builds the local view of a vehicle at the network layer. We have evaluated the performance of TPA through simulation with ns-3 simulator. Results show that TPA clearly outperforms the default 802.11 broadcasting mechanism in terms of network capacity. TPA also outperforms a similar adaptive technique not based on channel estimate in terms of network capacity for three scenarios.