Evaluation of Quality of Service (QoS) Support for Real-Time or Mission Critical Services over IEEE 802.11e Wireless Networks

Multimedia application is currently making much impact in this technological era. It has been the key driving force behind the convergence of fixed, mobile and IP networks. Furthermore, real-time applications are making head way in vehicular networks, mission critical and, military applications which use dedicated short range communications (DSRC). 802.11e standards support quality of services (QoS) guarantees in these applications. This is opposed to the problem with 802.11 legacy which is based on distributed coordination function (DCF), and its inability to prioritized applications for service differentiation. Simulation was done on various 802.11e networks which use enhanced DCF (EDCF). In these simulations, it was observed that controlling low priority applications enhances the effectiveness of high priority applications. It was actually observed that high priority applications have greater impacts on the performance of the network and hence performs better when it comes to delay and throughput requirements.