Velocity Adaptive Handover Scheme for Mobile Wi- max

Mobile WiMAX is a wireless technology that is support by IEEE802.16e for broadband wireless access. In wireless communication system, mobility is the vital feature. Due to mobility, there is the need of handover. Handover occurs when a mobile station (MS) move about from a serving base station (SBS) to another base station (BS). Hard handover is defined as obligatory and the soft handover is not obligatory. There is delay in mobile communication because data transmission should suspend. Due to handover delay, there is severe degradation in system performance when implemented in real-time applications like VoIP. The existing standard considers only the received signal strength that decides when handover occur. Though, there is velocity factor that has an important influence on handover initiation as well and cannot be neglected. To handle these types of issues, this article suggests a velocity-adaptive handover scheme. This scheme adopts dynamic handover threshold according to different velocity that shrink handover delay and boost the network resource utilization. The simulation outcome and performance analysis validate the efficiency of the proposed scheme..The proposed scenario has been implemented using Qualnet network simulator and results shows that the proposed mechanism that reduce handover delay.