GSM, UMTS, WIMAX, and WIFI are different wireless network types, which demands interoperability. Mobile WiMAX is the demanded technology for broadband wireless communication. The challenging aspect is to ensure service continuity for a mobile user when changing different access network. Due to the diversity of mobile networks and services offered by different operators, most users ask for better services without worrying about the technological constraints. Users must have the possibility to migrate from one area to another one without losing connection, knowing that these areas are using different technologies. Most of the Mobile users want quick and seamless service connection, and in mobile WiMAX network handover schemes, the authentication procedure takes long time to execute and thus producing delay in communication. This paper is the review of different handover mechanisms that has been proposed for reducing delay in communication between different users and providing fast and secure authentication schemes to meet the security requirement of users in the network. A pre-authentication based HO schemes for fast and secure HO, are shown to be vulnerable to Denial of Service attacks and Replay attacks. This paper discusses an EAP-based Authentication scheme, an EEP scheme and EAP-TTLS scheme which are proposed to optimize Handover Latency and to overcome above vulnerabilities with much less computational and communicational resources.

EAP, IEEE 802.16e and Handover

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