enhancements are similar in concept to those incorporated in third generation cellular standards such as CDMA2000* high rate packet data (HRPD) [4] or the high speed downlink packet access (HSDPA) feature within the Universal Mobile Telecommunications System (UMTS) standard [1], they have been specifically tailored to an OFDMA air interface. Additional subchannelization options have been added in IEEE 802.16e to improve resource management flexibility and achieve better system performance under a wide range of operating conditions. IEEE 802.16e also adds new medium access control (MAC) procedures related to handover support. Multiple carrier bandwidths and associated fast
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