Year: 2012
Type: article
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.
Author: Issaka Hassane Abdoulaziz
Institution: Hunan University
Language: English
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: bronze
Award: 支持QoS的主动无线传感器网络中间件研究
OpenAlex ID: W1608423206