Interference-Safe CSMA Networks by Local Aggregate Interference Power Measurement
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.
Provided by: Institute of Electrical & Electronic Engineers Topic: Mobility Date Added: Jul 2012 Format: PDF