Adaptive Optimization of Rate Adaptation Algorithms in Multi-Rate WLANs

摘要: Rate adaptation is one of the basic functionalities in today's 802.11 wireless LANs (WLANs). Although it primarily designed to cope with variability channels and achieve higher system spectral efficiency, its design needs careful consideration cross-layer dependencies, particular, link-layer collisions. Most practical rate adaptations focus on time-varying characteristics channels, ignoring impact As a result, they may lose their effectiveness due unnecessary downshift wrongly triggered by Some recently proposed use RTS/CTS suppress collision effect differentiating collisions from channel errors. The handshake, however, incurs significant overhead rarely activated infrastructure WLANs. In this paper, we introduce new approach for optimizing operation adjusting rate-increasing decreasing parameters based measurement. To construct algorithm, study thresholds performance show that dynamic adjustment an effective way mitigate multi-user environments. Our method does not require additional probing incurred exchanges be practically deployed without change firmware. We demonstrate our solution, comparing existing approaches through extensive simulations.