Internet technology has rapidly changed in the last decade. It provides the quality in the ease of access and improved cost effectiveness, which makes it communication network of the day. The vast use of the internet is because of excessive services provided by it like checking sent emails, video applications, online tickets and chatting etc. which is increasing day by day. But, there are some technical challenges need to be resolved. IEEE802.16 standard provide the future worldwide deployment of Broadband Wireless. It is capable of enabling millions of nodes to use wireless Internet, at cheaper cost & ease. WiMAX wireless coverage will be measured in square kilo meters whereas Wi-Fi is measured only in square meters. Wi-Fi had the lack of providing network guarantees like error rate, delay in packets and throughput. These guarantees are accounted during effective real time transmission of Voice over IP and video conferencing using internet. In this paper we emphasize on a MAC scheduling algorithms of WiMAX & its implementation steps in ns-2 for IEEE 802.16 standards.