Mobility

Interference-Safe CSMA Networks by Local Aggregate Interference Power Measurement

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Executive Summary

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 pre-specified 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.

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