Journal ArticleDOI
Enhancing VANET Performance by Joint Adaptation of Transmission Power and Contention Window Size
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TLDR
A new scheme for dynamic adaptation of transmission power and contention window (CW) size to enhance performance of information dissemination in Vehicular Ad-hoc Networks (VANETs) and features significantly better throughput and lower average end-to-end delay compared with a similar scheme with static parameters.Abstract:
In this paper, we present a new scheme for dynamic adaptation of transmission power and contention window (CW) size to enhance performance of information dissemination in Vehicular Ad-hoc Networks (VANETs). The proposed scheme incorporates the Enhanced Distributed Channel Access (EDCA) mechanism of 802.11e and uses a joint approach to adapt transmission power at the physical (PHY) layer and quality-of-service (QoS) parameters at the medium access control (MAC) layer. In our scheme, transmission power is adapted based on the estimated local vehicle density to change the transmission range dynamically, while the CW size is adapted according to the instantaneous collision rate to enable service differentiation. In the interest of promoting timely propagation of information, VANET advisories are prioritized according to their urgency and the EDCA mechanism is employed for their dissemination. The performance of the proposed joint adaptation scheme was evaluated using the ns-2 simulator with added EDCA support. Extensive simulations have demonstrated that our scheme features significantly better throughput and lower average end-to-end delay compared with a similar scheme with static parameters.read more
Citations
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References
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Proceedings ArticleDOI
IEEE 802.11p: Towards an International Standard for Wireless Access in Vehicular Environments
Daniel Jiang,Luca Delgrossi +1 more
TL;DR: An overview of the latest draft proposed for IEEE 802.11p, named wireless access in vehicular environment, also known as WAVE, is provided to provide an insight into the reasoning and approaches behind the document.
Journal ArticleDOI
VANET Routing on City Roads Using Real-Time Vehicular Traffic Information
TL;DR: A class of routing protocols called road-based using vehicular traffic (RBVT) routing, which outperforms existing routing protocols in city-based vehicular ad hoc networks (VANETs), is presented and designed and implemented and compared them with protocols representative of mobileAd hoc networks and VANets.
Journal ArticleDOI
Performance analysis of priority schemes for IEEE 802.11 and IEEE 802.11e wireless LANs
TL;DR: An analytical model is proposed to derive saturation throughputs, saturation delays, and frame-dropping probabilities of different priority classes for all proposed priority schemes, and the results from this paper are beneficial in designing good priority parameters.
Journal ArticleDOI
Ad hoc peer-to-peer network architecture for vehicle safety communications
Wai Chen,Shengwei Cai +1 more
TL;DR: This article addresses the design of an architecture for ad hoc peer-to-peer networking of neighboring vehicles to help achieve near-instantaneous communication for safety applications such as collision avoidance warnings.
Journal ArticleDOI
Supporting QoS in IEEE 802.11e wireless LANs
TL;DR: An analytical model is built to derive an average delay estimate for the traffic of different priorities in the unsaturated 802.11e WLAN, showing that the QoS requirements of the real-time traffic can be satisfied if the input traffic is properly regulated.