QoS Aware Vertical Handoff Decision for UMTS-WiMAX Networks

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The main challenge in 4G networks is to perform the vertical handoff between pairs of different types of networks in the presence of 2G, 3G, WLAN, WMAN, satellite etc along with the fulfillment of quality of service (QoS) requirements. The lack of QoS can cause break in network during handoff or loss of network at remote condition. Hence in order to overcome these issues, in this paper, we propose a QoS aware vertical handover decision for (QAVHD) in 4G networks. Initially, when the mobile terminal (MT) on movement finds a new network, it collects the QoS information of the respective network that includes signal strength, network coverage area, data rate, available bandwidth, velocity of MT and network latency. Then MT compares estimated measurements with its old network and network which provides better QoS is selected as current network. The old network then performs the data transmission to the new network.  By simulation results, we show that the proposed approach enhances the network throughput and minimizes the latency.
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4G Networks; Vertical Handoff (VHO); Mobile Terminal (MT); Quality of Service (QoS)

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