Robust rate adaptation for 802.11 wireless networks
Proceedings of the 12th annual international conference on Mobile computing and networking
Trade-off analysis of PHY-Aware MAC in low-rate low-power UWB networks
IEEE Communications Magazine
Joint source coding and data rate adaptation for energy efficient wireless video streaming
IEEE Journal on Selected Areas in Communications
Towards energy efficient and robust routing with delay guarantees in adhoc and sensor networks
Proceedings of the 6th International Wireless Communications and Mobile Computing Conference
AS-MAC: Utilizing the adaptive spreading code length for wireless sensor networks
ACM Transactions on Sensor Networks (TOSN)
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The use of variable data rate can reduce network latency and average power consumption, and automatic rate selection is critical for improving scalability and minimizing network overhead. In the IEEE 802.15.4 standard the SNR can be inferred through the radio reported link quality or received signal strength, and an extension to the standard leads to highly dynamic and accurate rate selection. Using data from an experimental study of 44 IEEE 802.15.4 nodes in an industrial mesh network, SNR is extracted to show sufficient margin exists for higher data rate communication. A variable rate signaling scheme with automatic rate selection is proposed to provide links at the standard 250kb/s as well as 500kb/s, 1000kb/s and 2000kb/s with a minimum of hardware changes. Using the experimental data to generate a model of the real world system, total network energy is compared using legacy and variable rate signaling showing over 40% savings.