less products based on the harmonized IEEE 802.16-2004 and its amendments and/or revisions. The ultimate goal of the WiMAX Forum is to promote and accelerate the introduction of cost-effective broadband wireless access services into the marketplace. Stan- dards-based, interoperable solutions enable economies of scale that, in turn, drive price and performance levels unachievable by proprietary solutions, making WiMAX Forum-certified prod- ucts the most competitive at delivering broadband services on a wide scale. WiMAX Forum- certified products are fully interoperable and support broadband fixed, portable, and mobile services. Along these lines, the WiMAX Forum works closely with service providers and regulators to ensure that WiMAX Forum-certified systems meet customer and government requirements. WiMAX Forum has been developing the mobile WiMAX system profiles that define mandatory and optional features of the IEEE 802.16 standard that are necessary to build a mobile WiMAX compliant air interface which can be certified by WiMAX Forum [33]. The mobile CHAPTER 1 Introduction to Mobile Broadband Wireless Access WiMAX system profile enables mobile systems to be configured based on a common feature set, thus ensuring basic functionality for terminals and base stations that are fully interoperable. Some elements of the base station profiles are specified as optional to provide additional flexibility for regional deployments based on specific usage models that may require different configurations that are either capacity-optimized or coverage-optimized. Release 1.0 of the mobile WiMAX system profiles covers 5, 7, 8.75, and 10 MHz channel bandwidths for licensed spectrum allocations in the 2.3, 2.5, 3.3, and 3.5 GHz frequency bands. The term WiMAX (Worldwide Interoperability for Microwave Access) has been used generically to describe wireless systems based on the WiMAX certification profiles, and the IEEE 802.16-2004 air interface standard and its amendments or revisions. Fixed WiMAX is used to describe IEEE 802.16-200