T Effect of Mobility Patterns on VoIP QoS in Mobile WiMAX

VoIP over Mobile WiMAX provides high data rate voice connectivity to high speed mobile as well as to fixed users. Voice over Internet Protocol (VoIP) enables the transport of voice data over internet protocol base networks. The WiMAX mobile network provides data services to both mobile as well as pedestrian users and the quality of voice is greatly affected with the mobility patterns of mobile users. The mobility behavior of the user plays an important role in determining the quality of Voice. For providing better quality of service to end user, the Mac layer of WiMAX defines various QoS classes for different types of applications. In this research paper, we analyze the performance of VoIP codecs over mobile WiMAX when resources are allocated to VoIP users using best effort Scheduling scheme. We analyze the performance of voice codecs under two conditions, first, the jitter buffer is enabled and disables, second the mobile user are moving at different speeds in random way point and group mobility patterns. Our comprehensive simulation results show that the performance of voice codecs remain same for random way point and group mobility patterns. Our results reveal that the G729 provides better voice quality as well as support more number of connections as compared to other voice codecs.