Handover Necessity Estimation for 4G Heterogeneous Networks

Details Handover Necessity Estimation for 4G Heterogeneous Networks Handover Necessity Estimation for 4G Heterogeneous Networks

2012-02-08

arxiv.org/abs/1202.1733v1

International Journal of Information Sciences and Techniques (IJIST) Vol.2, No.1, January 2012

Computer Science

Networking and Internet Architecture

Scientific paper

10.5121/ijist.2012.2101

One of the most challenges of 4G network is to have a unified network of heterogeneous wireless networks. To achieve seamless mobility in such a diverse environment, vertical hand off is still a challenging problem. In many situations handover failures and unnecessary handoffs are triggered causing degradation of services, reduction in throughput and increase the blocking probability and packet loss. In this paper a new vertical handoff decision algorithm handover necessity estimation (HNE), is proposed to minimize the number of handover failure and unnecessary handover in heterogeneous wireless networks. we have proposed a multi criteria vertical handoff decision algorithm based on two parts: traveling time estimation and time threshold calculation. Our proposed methods are compared against two other methods: (a) the fixed RSS threshold based method, in which handovers between the cellular network and the WLAN are initiated when the RSS from the WLAN reaches a fixed threshold, and (b) the hysteresis based method, in which a hysteresis is introduced to prevent the ping-pong effect. Simulation results show that, this method reduced the number of handover failures and unnecessary handovers up to 80% and 70%, respectively.

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