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Interference-safe CSMA Networks by Local Aggregate Interference Power Measurement

Abstract : Most current wireless IEEE 802.11 networks rely on a power-threshold based carrier-sensing multi-access (CSMA) mechanism to prevent packet collisions, in which a transmitter permits its transmission only if the locally measured aggregate interference power from all existing transmissions is below a prespecified power-sensing threshold. However, such a mechanism can not completely guarantee interference-safe transmissions, leading to the so-called hidden-node problem, which causes degradation in throughput and fairness performance. Traditionally, ensuring interference-safe transmissions was addressed by simple models of conflict graphs, rather than by the realistic signal-to-interference-and-noise ratio (SINR) model. This paper presents the first viable solution for fully interference-safe transmissions that (1) assumes an accurate SINR model, and (2) is compatible with the carrier-sensing mechanism in existing CSMA networks. Specifically, we determine a proper interference-safe power-sensing threshold by considering both the effects of (i) arbitrary ordering of local interference power measurements, and (ii) ACK frames. We compare our interference-safe solution with other solutions, and provide extensive evaluation on its throughput and fairness performance.
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Submitted on : Monday, December 10, 2012 - 11:25:06 AM
Last modification on : Friday, February 15, 2019 - 11:54:04 AM
Long-term archiving on: : Monday, March 11, 2013 - 12:15:54 PM

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Chi-Kin Chau, Jialiang Zhang, Minghua Chen, Soung Chang Liew. Interference-safe CSMA Networks by Local Aggregate Interference Power Measurement. WiOpt'12: Modeling and Optimization in Mobile, Ad Hoc, and Wireless Networks, May 2012, Paderborn, Germany. pp.1-8. ⟨hal-00763151⟩

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