Improved Handover Interruption Time in WiMAX, Using GPS

WiMAX (Worldwide Interoperability Microwave Access) has been one of the most important technologies in telecommunication networks during last few years. Mobility is the most challenging research in WiMAX networks that are highlighted in broadband wireless communications. There is more demand for new data services which need high data rate. But the long interruption of handovers is not acceptable for this kind of services. The real time services like: IPTV and VoIP are sensitive to packet loss. This paper is focused on procedures and the interruption time of full handover in mobile WiMAX. All events that affect on handover during movement of a mobile station will be considered. We have presented a new algorithm to improve the handover interruption time and to decrease the amount of signaling transaction during the handover procedure. In this algorithm we have used GPS (Global Position system) to perform handover faster. Our focus in this algorithm is on the distance between MS (Mobile Station) and BS (Base Station). The MS finds its position using GPS and calculates distance to the SBS (Source Base Station) and neighbor BSs. In the next step, MS selects the target BS according to the distance.