Browsing by Author "Leng, S."

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    An Enhanced Multi-Channel MAC for the IEEE 1609.4 Based Vehicular Ad Hoc Networks
    (INFOCOM IEEE Conference on Computer Communications Workshops, 2010) Wang, Q.; Leng, S.; Fu, H.; Zang, Y.; Weerasinghe, K.G.H.D.
    This paper proposes a multi-channel MAC scheme for Vehicular Ad Hoc Networks (VANETs), which dynamically adjusts the intervals of Control Channel (CCH) and Service Channels (SCHs). Markov modeling is conducted to optimize the intervals based on the traffic condition. The scheme also introduces a multi-channel coordination mechanism to provide the contention-free access in SCHs. Theoretical analysis and simulation results show that the proposed scheme is able to help IEEE 1690.4 MAC improve the saturation throughput of SCHs significantly, while maintaining the prioritized transmission of critical safety information on the CCH.
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    Anonymous service access for Vehicular Ad hoc Networks
    (Information Assurance and Security (IAS), 2010 Sixth International Conference, 2011) Weerasinghe, K.G.H.D.; Fu, H.; Leng, S.
    Communications through road side units in Vehicular Ad hoc Networks (VANETs) can be used to track the location of vehicles, which makes serious threat on users' privacy. In this paper, we propose and evaluate a novel location privacy enhancement protocol for VANETs. Firstly, we propose an Anonymous Online Service Access (AOSA) protocol. Secondly, we analytically evaluate the anonymity and the unlinkability of the proposed protocol. Finally, a series of simulation studies are conducted to evaluate the performance of our protocol in the real VANET environments such as Manhattan and Urban scenarios. According to analytical evaluation and simulations, our protocol provides higher level of anonymity and location privacy for on-line service access applications. Simulation results further show that our protocol is feasible and produces better performance in real VANET environments by producing higher success ratio and smaller delay.