Practical Rate and Route Adaptation With Efficient Link Quality Estimation for IEEE 802.11b/g Multi-Hop Networks
Accurate and fast Packet Delivery Ratio (PDR) estimation, used in evaluating wireless link quality, is a prerequisite to increase the performance of multi-hop and multi-rate IEEE 802.11 wireless networks. Unfortunately, contemporary PDR estimation methods, i.e. beacon-based packet counting in Estimated Transmission Time and Expected Transmission Count metrics, have unsatisfactory performance. Therefore, in this paper the authors propose a novel PDR estimation method based on SNR profiles and special broadcast packets. They classify all possible Link Quality Estimation (LQE) sources and compare them analytically against the design, showing the superiority of the approach. Further investigations with the prototype implementation of the method in IEEE 802.11b/g testbeds reveal that the LQE accuracy in some scenarios can be improved up to 50% in comparison to generic beacon packet-based LQE.