Handover Necessity Estimation for 4G Heterogeneous Networks
Abstract
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.
- Publication:
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arXiv e-prints
- Pub Date:
- February 2012
- DOI:
- 10.48550/arXiv.1202.1733
- arXiv:
- arXiv:1202.1733
- Bibcode:
- 2012arXiv1202.1733A
- Keywords:
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- Computer Science - Networking and Internet Architecture
- E-Print:
- International Journal of Information Sciences and Techniques (IJIST) Vol.2, No.1, January 2012