In the present scenario, new and fast emerging technologies are taking place in the field of wireless networks. These technologies allow high speed broadband wireless access. Mobile WiMAX (Worldwide Interoperability for Microwave Access) based on 802.16e-2005 supports 4G, is an advanced next generation mobile broadband wireless network. IEEE 802.16e -2005 is an amendment to IEEE 802.16 -2004. IEEE 802.16 -2004 was a fixed data transmission scheme for broadband connection to MAN. In WiMAX wireless MAN-OFDMA specification helps to provide an advanced air interface for operation in either licensed or unlicensed bands. This paper primarily focuses on the description and working of mobile WiMAX technology, various handover processes, the requirements of handover processes and their working supported by the mobile WiMAX due to the mobility.