Improving VoIP Traffic Performance in WiMAX Networks

Recently, a promising technology called WiMAX is providing wireless last-mile connectivity due to its high speed data rates, low cost of deployment, and large coverage area. Both MAC and Physical layer of this technology refer to the IEEE 802.16e standard, which defines five different data delivery service classes that can be used in order to satisfy Quality of Service (QoS) requirements of different applications, such as VoIP, FTP, videoconference, Web, etc. The main aim of this paper is to examine a case of QoS large cell deployment over a cellular WiMAX network. In particular, the paper compares the performance obtained using ertPS service class for voice application in static and mobile conditions. Results indicate that on WiMAX connection statistics, traffic contract was made correctly by considering the overheads, and the performance of voice in mobile environment showed an acceptable level for Mean Opinion Score at around 3.55 until 100 seconds.