I. INTRODUCTION
Broadband wireless is all about bringing the broadband experience to a wireless context, which offers users with certain unique benefits and also convenience. In this, mobile broadband offers the additional functionality of portability, nomadic city and mobility. Mobile broadband attempts to provide broadband applications to the end user with new experience scenarios which can offer a very different value proposition. And hence, WiMAX (Worldwide interoperability for Microwave Access) described in IEEE 802.16 Wireless Metropolitan Area Network (MAN) standard is designed to accommodate both fixed and mobile broadband applications (Rober, 2008)[1].