Performance Evaluation of WIMAX Network with High QOS Services Incorporating Different Physical & Mac Layer Standards

VoIP application of Worldwide Interoperatability microwave access (WiMAX) is a broadly deployed technology and has a great impact in field of 4th generation networks. Main advantage of this technology is utilization of existing infrastructure in the form of internet connection. There are several QoS classes for VoIP application in IEEE 802.16 systems, such as unsolicited poll grant, rtPS, nrtPS, Ertps and BE. The major issue in VoIP is quality of service. In order to send better quality in voice data s5ome factors like delay, jitter, throughput, packet delivery ratio and mean opinion score (MOS) need to be improved so as to maintain the performance of this application in WiMAX.The proposed idea required no modification of the framework of IEEE 802.16 system and we have analyzed and discussed the performance of the quality of service classes recommended in the IEEE 802.16 system and compared it with proposed approach.The approach proposed in the thesis considers the parameters of Peak Sustained Traffic Rate and Orthogonal Frequency Division Multiplexing (OFDM) frame duration to improve the quality of service for VoIP. The simulation of VoIP has been done with Peak Sustained Traffic Rate OFDM frame duration with these parameters values the performance metrics delay, network load and jitter have been improved which in turn has enhanced the performance of existing Extended Real Time Polling Service.