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Proceedings of the 7th annual international conference on Mobile computing and networking
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IEEE Journal on Selected Areas in Communications
FlexMAC: a wireless protocol development and evaluation platform based on commodity hardware
Proceedings of the third ACM international workshop on Wireless network testbeds, experimental evaluation and characterization
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Proceedings of the 15th annual international conference on Mobile computing and networking
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NSDI'10 Proceedings of the 7th USENIX conference on Networked systems design and implementation
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WiNTECH '11 Proceedings of the 6th ACM international workshop on Wireless network testbeds, experimental evaluation and characterization
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Developing and evaluating wireless protocols is challenging because it requires flexible network interface hardware, which is not readily available. In this paper, we present FlexMAC, a wireless protocol development and evaluation platform based on commodity hardware. FlexMAC targets CSMA wireless protocols and allows customization of functions such as backoff, retransmission, and packet timing. We describe our implementation of FlexMAC and quantify FlexMAC's precision for 802.11b compared with commercial hardware implementations. The results show that FlexMAC's performance is very close to that of hardware implementations. We also present two case studies that illustrate FlexMAC's flexibility: the use of opportunistic relaying to boost throughput and an investigation of temporal and throughput fairness. We found that FlexMAC is a useful tool for conducting 802.11-style protocol research.