Understanding the Role of Multi-Rate Retry Mechanism for Effective Rate Control in 802.11 Wireless LANs

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Executive Summary

The authors consider the Multi-Rate Retry (MRR) capability provided by current 802.11 implementations and carry out simulation-based study of its impact on performance with state-of-the-art rate control mechanisms in typical indoor wireless LAN scenarios. They find that MRR is more effective in non-congested environments, necessitating the need for a mechanism to differentiate between congested and non-congested situations to better exploit the MRR capability. They also observe that decoupling the long-term rate adaptation algorithm from the MRR mechanism is key to fully realizing the benefits of MRR. Guided by these observations, they develop a new rate control mechanism called SDRA that performs coherent yet independent rate adaptation and multi-rate retry.

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