RSS based Vertical Handoff algorithms for Heterogeneous wireless networks - A Review

Abhijit Bijwe,C G Dethe

doi:10.14569/specialissue.2011.010210

Abstract

Heterogeneous networks are integrated in fourth generation. To have seamless communication and mobility between these heterogeneous wireless access networks, support of vertical handoff is required. Vertical handover is convergence of heterogeneous networks for e.g.:- handover between WLAN and cellular networks. In this paper, three algorithms on RSS based vertical handoff are discussed. First, algorithm is adaptive lifetime based vertical handoff, which combines RSS and estimated lifetime (expected duration after which the MT will be able to maintain its connection with WLAN) to decide the vertical handover. Second algorithm, is based on dynamic RSS threshold which is more suitable for handover from WLAN to 3G network. Third algorithm is a traveling distance prediction method, which works well for WLAN to cellular networks and vice versa. This avoids unnecessary handoff and also minimizes failure robability.

Highlights

Convergence of heterogeneous network is getting a lot of attention
There is an improvement on the average throughput for user because MT prefers to stay in WLAN cell as long as possible
As per the discussion above, we conclude that Adaptive lifetime based method gives an Improvement in average throughput for user because MT prefers to stay in WLAN cell

Summary

INTRODUCTION

Convergence of heterogeneous network is getting a lot of attention. To be precise, in 4G network, a mobile terminal incorporated with multiple interfaces will be able to choose the appropriate available access links. Numerous Vertical handover decision algorithms are proposed in various research papers which takes into account several parameters such as Bandwidth, Power consumption, Cost, Security etc. Based on these parameters, cost function algorithm and multiple attribute decision algorithms may be used. Cost function algorithm and multiple attribute decision algorithms may be used These algorithms use different set of parameters [5] to provide better handoff. RSS based algorithms are less complex and can be used between macro cellular and microcellular networks. We will be focusing on various Mathematical Models in RSS based vertical handover decision algorithms. We make an attempt to provide a comparative analysis of three RSS based vertical handoff algorithms

RSS BASED VHD ALGORITHMS

Algorithm on Adaptive RSS Threshold

G Network a

CONCLUSION

FUTURE DIRECTIONS