Mobile WiMAX is one of the most promising technologies for broadband wireless communication based on the IEEE 802.16e-2005 standard. Mobile WiMAX brings wireless broadband to a new dimension providing the support of nomadism.IEEE 802.16e standard for 4G Cellular Technology-Mobile WiMAX is proposed to support mobility. As a result,handover has become one of the most important QoS factors. Lack of clarification in the conventional algorithm for handover process leads to significant wastage of channel resource along with undesired delay.It also causes substantial degradation in the overall system performance. Existing standard for handover includes scanning as one of the most vital processes.Scanning requests without proper response and delayed initiation of scanning only deteriorate the scenario.This threatening handover delay is a huge obstacle for the optimum performance of mobile WiMAX. In this book,various problematic scenarios of handover procedure have been shown and from that an optimized handover scheme is proposed associated with suitable pre-scanning algorithm, fast dedicated ranging and pre-registration process.