AGILE Rate Control for IEEE 802.11 Networks

Authors:
Lochan Verma;Seongkwan Kim;Sunghyun Choi;Sung-Ju Lee
Affiliations:
Wireless Lab., DMC Division, Samsung Electronics, Korea;System Design Lab. 1, DMC Division, Samsung Electronics, Korea;School of Electrical Engineering & INMC, Seoul National University, Korea;Multimedia Communications & Networking Lab., HP Labs, Palo Alto 94304
Venue:
FGIT '09 Proceedings of the 1st International Conference on Future Generation Information Technology
Year:
2009

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Abstract

We present a transmission rate adaptation algorithm called AGILE (ACK-Guided Immediate Link rate Estimation) for IEEE 802.11 networks. The key idea of AGILE is that the transmitter adjusts the transmission rate by means of measuring the SNR (Signal-to-Noise Ratio) during any frame reception including the ACK (Acknowledgment) frame, and estimating the corresponding maximum achievable throughput using a profile , which is materialized by extensive off-line measurement. AGILE is equipped with an advanced RTS (Request-To-Send)/CTS (Clear-To-Send) activation algorithm, eRTS filter that intelligently switches on/off RTS frame transmission to enhance the achievable throughput depending upon the existence of multiple contending (or even hidden) stations. The effectiveness of AGILE is evaluated in our MadWifi-based testbed implementation and we compare its performance with different rate adaptation schemes in various scenarios.