Vertical handoff algorithm in heterogeneous networks for reducing interference

Abstract

A vertical handoff decision algorithm in heterogeneous networks composed of CDMA Cell Networks (CN) and Wireless Local Area Network (WLAN) is proposed to minimize the total interference in CDMA. The scope of WLAN is determined by minimizing interference and each communicating node shall handoff to WLAN as soon as it enters the scope. We first propose a model for heterogeneous networks, and based on it we obtain the close-form expression of interference. In order to minimize interference, we use simulation annealing method to get the WLAN radius, which is called basic algorithm. In order to reduce the interference further, we improve the basic and get the enhanced algorithm. Through numerical computing, we analyze the interference in condition of different call arrive rates, and results show that the enhanced can reduce interference more greatly than the basic.

QoS-aware fuzzy rule-based vertical handoff decision algorithm incorporating a new evaluation model for wireless heterogeneous networks

“…(1) Direct numerical methods; (2) Iterative numerical methods; (3) Techniques that yield closed-form results. Each type of numerical method has merits of its own.…”

“…Smaoui et al [2] have proposed a new handoff scheme for reducing handoff delay using the concepts of Received Signal Strength and threshold management. Considering reduction of total interference in CDMA, a vertical handoff decision algorithm among the CDMA networks and wireless local area networks (WLANs), is proposed in [3]. A combination of some of the criteria like bandwidth, RSSI and delay is also considered for making a handoff decision [4].…”