Performance Analysis of an Adaptive-Rate Buffer-Aware CSMA/CA-Based MAC Protocol
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Under the IEEE 802.11 Distributed Coordination Function (DCF), which is based on carrier-sense multiple access with collision avoidance (CSMA/CA), each user has an equal probability to access the channel irrespective of their buffer backlogs. In this thesis, we propose an Adaptive-Rate Buffer-Aware CSMA/CA-based medium access control (MAC) protocol that provides different channel access probabilities to users depending upon their buffer backlogs. Additionally, we assign users with larger buffer backlogs higher transmission rates. The motive is to provide users experiencing larger delays a higher probability of accessing the channel and a higher transmission rate to deliver their packets. We develop a three-dimensional Markov chain model to evaluate the throughput and delay performance of such a network. With the help of simulations, we show that the model is accurate and the presented mechanism can indeed help in reducing the buffer backlogs of the users when used in place of the conventional IEEE 802.11 DCF MAC protocol.