Modified MAC for Priority Traffic with Slow Decrease of Contention Window and Reservation Based Packet Forwarding in IEEE 802.11 for QoS Provisioning

IEEE 802.11 lacks of the capability to support quality of services such as multimedia and real-time traffic properly. This paper presents a simple approach to enhance the multimedia real-time performance over the 802.11 WLAN by implementing a Quality Of Service Manager (QoSM) for differentiating services with two queues on top of the 802.11 medium access controller. With slow decrease of contention window (SD) and reservation based packet forwarding. The proposed scheme is verified with the help of ns-2 and an improved performance for multimedia real-time service in the infrastructure-based WLAN with the coexistence of the non-real time traffic.