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Throughput and QoS Optimization in IEEE 802.11 WLAN

In a wireless LAN (WLAN) based on IEEE 802.11, supporting multiple classes of services with QoS constraints in MAC layer is very important. In this paper, we propose a class-based analytical model to support multiple traffic classes. Through investigating the relationship between access control parameters, such as contention window (CW) sizes and inter-frame space (IFS) under QoS constraints, we derive a mathematical model to characterize the MAC behavior. In particular, we present an optimal solution which maximizes the throughput while satisfying the QoS requirements. Simulation results demonstrate the accuracy of our proposed model. Keywords— Medium access control (MAC), wireless LAN (WLAN), IEEE 802.11, quality of service (QoS).