Vertical Handoff In Cellular Networks using RSS and Velocity measurements.

Aruna Kumari Poleti

Abstract


ABSTR

ACT: In recent years, Cellular wireless technologies like GPRS, UMTS, CDMA and Wireless Local Area Networks (WLAN) like IEEE 802.11 have seen a quantum leap in their growth. Cellular technologies can provide data services over a wide area, but with lower data rates. WLAN technologies offer higher data rates, but over smaller Hot Spot areas. The demand for ubiquitous data service can be fulfilled, if it is possible for the end-user to seamlessly roam between these heterogeneous technologies. The IP based next-generation wireless communication networks require mobility management for providing global information access to users on the move, particularly for domain independent applications. The main challenge for seamless mobility and service continuity is the availability of efficient handoff algorithms to enhance Quality of Service (QoS). This paper proposes algorithms for executing vertical handoff decision function on Received signal strength (RSS) and velocity of the mobile node criteria, to provide good quality of service. Simulation is performed to execute handoff between UMTS and HIPERLAN for a fast moving and a slow moving vehicle, along with the measured RSS. RSS with dynamic threshold values is considered to perform timely handoff  decision between two heterogeneous networks.
Key Words: UMTS, 802.xx, mobility management, heterogeneous wireless networks, vertical handoff, seamless mobility, HIPERLAN.


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