Modified handoff algorithm for providing optimization in heterogeneous wireless networks

Abstract

In this study, the heterogeneous wireless network is considered. Obviously, it is an integration of two different access networks, namely cellular and WLAN. In the heterogeneous wireless networks, handoff is an important process when the user moves from one network (3G) to another network (WLAN). While the user is moving, the mobile nodes (MN) move within the coverage area of WLAN and 3G with different velocities. When user migrates between heterogeneous networks, for best performance, the seamless vertical handoff (VHO) is very essential. In this paper, we propose a modified optimization (M-OPTG) based VHO or horizontal handoff (HHO) algorithm for the heterogeneous wireless networks. The performance of M-OPTG algorithm with load, battery life time, velocity and call dropping analysis have been investigated. Some of the existing VHO or HHO algorithms provide only analytical results. In this paper, we have developed a real time study using network simulator to choose the appropriate network for providing service to a MN. Our proposed (M-OPTG) VHO or HHO algorithm provides better performance on the basis of battery life time, load balancing, call dropping probability and minimizes the number of handoffs based on the velocity of the MN. The Modified OPTG algorithm not only improves the collective battery life time of a MN, but also reduces the call dropping probability and unnecessary handover.