Performance Evaluation and Implementation of QoS Support in an 802.11b Wireless LAN

The availability of wireless technologies such as HomeRF, WaveLAN and Bluetooth have propelled the demand for their use in the office, home and public spaces. These technologies can provide wireless multimedia services. QoS for these services can be provided by means of a MAC level QoS or a network level QoS. In this paper we describe the implementation of a network level QoS for the 802.11b technology by using the Windows 2000 Operating System. The testbed is used to obtain throughput of UDP flows created by applications such as iperf and qtcp for different number of active stations, packet sizes and packet loss. These performance evaluation results are validated by means of stochastic simulation of the testbed by using GloMoSim.