A rate-adaptive MAC protocol for multi-Hop wireless networks
Proceedings of the 7th annual international conference on Mobile computing and networking
IEEE 802.11 rate adaptation: a practical approach
MSWiM '04 Proceedings of the 7th ACM international symposium on Modeling, analysis and simulation of wireless and mobile systems
Robust rate adaptation for 802.11 wireless networks
Proceedings of the 12th annual international conference on Mobile computing and networking
Efficient channel-aware rate adaptation in dynamic environments
Proceedings of the 6th international conference on Mobile systems, applications, and services
Cabernet: vehicular content delivery using WiFi
Proceedings of the 14th ACM international conference on Mobile computing and networking
Predictive methods for improved vehicular WiFi access
Proceedings of the 7th international conference on Mobile systems, applications, and services
Cross-layer wireless bit rate adaptation
Proceedings of the ACM SIGCOMM 2009 conference on Data communication
Augmenting mobile 3G using WiFi
Proceedings of the 8th international conference on Mobile systems, applications, and services
Vehicular wifi access and rate adaptation
Proceedings of the ACM SIGCOMM 2010 conference
Performance comparison of 3G and metro-scale WiFi for vehicular network access
IMC '10 Proceedings of the 10th ACM SIGCOMM conference on Internet measurement
IEEE/ACM Transactions on Networking (TON)
Improving wireless network performance using sensor hints
Proceedings of the 8th USENIX conference on Networked systems design and implementation
Strider: automatic rate adaptation and collision handling
Proceedings of the ACM SIGCOMM 2011 conference
ICNP '11 Proceedings of the 2011 19th IEEE International Conference on Network Protocols
LoadingZones: leveraging street parking to enable vehicular internet access
Proceedings of the seventh ACM international workshop on Challenged networks
MRMV: design and evaluation of a multi-radio multi-vehicle system for metro-WiFi access
Proceeding of the tenth ACM international workshop on Vehicular inter-networking, systems, and applications
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Rate selection in a wireless network is the problem of estimating the current channel conditions and determining the best physical layer bit rate for the outgoing frames in order to maximize the current throughput. All rate adaptation algorithms in literature arrive at an estimate of the current channel conditions by considering the recent history often in the order of seconds. In vehicular WiFi access networks, the constantly changing wireless channel conditions make the channel history quickly irrelevant. We develop BRAVE - an SNR-based rate adaptation algorithm, which only considers short history (500 ms) to make rate selection decisions. We show that a coarse-grained training approach is sufficient to estimate the SNR thresholds for rate selection as opposed to previous approaches that train on a per environment or a per AP basis. We study three frame-based rate adaptation algorithms and a popular SNR-based rate adaptation algorithm along with BRAVE and highlight their shortcomings in the rapidly changing vehicular WiFi access environment. In order to compare the algorithms under repeatable channel conditions, we also develop and use a novel emulation methodology where a software radio-based programmable noise generator is used to emulate varying link quality under vehicular mobility. We show that BRAVE performs significantly better than several prominent frame-based and the SNR-based rate adaptation algorithms.