Performance evaluation of QoS in wireless networks using IEEE 802.11e

The increase demand for Quality of Service (QoS) in computer networks and the recent popularization of wireless networks required a standard to bring QoS to such networks. The IEEE 802.11e, a complement to the 802.11 family, answers to these requirements implementing such QoS mechanisms. The main contribution of this work is to provide an evaluation of the final IEEE 802.11e standard. Using the ns-2 simulator, we compare it against IEEE 802.11a with a FIFO queue, as well as priority and round robin arbiter queues. We also consider different scenarios, both in ad hoc and infra-structure modes. Our results show that the IEEE 802.11e can improve the QoS of a wireless network in all scenarios.