A rate-adaptive MAC protocol for multi-Hop wireless networks
Proceedings of the 7th annual international conference on Mobile computing and networking
Wireless Communications: Principles and Practice
Wireless Communications: Principles and Practice
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Proceedings of the 2004 conference on Applications, technologies, architectures, and protocols for computer communications
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MSWiM '04 Proceedings of the 7th ACM international symposium on Modeling, analysis and simulation of wireless and mobile systems
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ICNP '04 Proceedings of the 12th IEEE International Conference on Network Protocols
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Proceedings of the 12th annual international conference on Mobile computing and networking
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Proceedings of the 2007 conference on Applications, technologies, architectures, and protocols for computer communications
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ACM SIGMOBILE Mobile Computing and Communications Review
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Proceedings of the 6th international conference on Mobile systems, applications, and services
Proceedings of the 14th ACM international conference on Mobile computing and networking
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Proceedings of the ACM SIGCOMM 2009 conference on Data communication
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Proceedings of the 15th annual international conference on Mobile computing and networking
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Proceedings of the 14th ACM international conference on Modeling, analysis and simulation of wireless and mobile systems
BRAVE: bit-rate adaptation in vehicular environments
Proceedings of the ninth ACM international workshop on Vehicular inter-networking, systems, and applications
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IEEE/ACM Transactions on Networking (TON)
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Accurately selecting modulation rates for time-varying channel conditions is critical for avoiding performance degradations due to rate overselection when channel conditions degrade or underselection when channel conditions improve. In this paper, we design a custom cross-layer framework that enables: 1) implementation of multiple and previously unimplemented rate adaptation mechanisms; 2) experimental evaluation and comparison of rate adaptation protocols on controlled, repeatable channels as well as residential urban and downtown vehicular and nonmobile environments in which we accurately measure channel conditions with 100-µs granularity; and 3) comparison of performance on a per-packet basis with the ideal modulation rate obtained via exhaustive experimental search. Our evaluation reveals that SNR-triggered protocols are susceptible to overselection from the ideal rate when the coherence time is low (a scenario that we show occurs in practice even in a nonmobile topology), and that "in situ" training can produce large gains to overcome this sensitivity. Another key finding is that a mechanism effective in differentiating between collision and fading losses for hidden terminals has severely imbalanced throughput sharing when competing links are even slightly heterogeneous. In general, we find trained SNR-based protocols outperform loss-based protocols in terms of the ability to track vehicular clients, accuracy within outdoor environments, and balanced sharing with heterogeneous links (even with physical layer capture).