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Dynamic Load Balancing with Handover in Hybrid Li-Fi and Wi-Fi Networks

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Original languageEnglish
JournalJournal of Lightwave Technology
Volume33
Issue number22
DOIs
Publication statusPublished - 2015

Abstract

In this paper, a hybrid network combining light
fidelity (Li-Fi) with a radio frequency (RF) wireless fidelity
(Wi-Fi) network is considered. An additional tier of very small
Li-Fi attocells which utilise the visible light spectrum offers a
significant increase in wireless data throughput in an indoor
environment while at the same time providing room illumination.
Importantly, there is no interference between Li-Fi and Wi-Fi.
A Li-Fi attocell covers a significantly smaller area than a Wi-
Fi access point (AP). This means that even with moderate user
movement a large number of handover between Li-Fi attocells
can occur, and this compromises the system throughput. Dynamic
load balancing (LB) can mitigate this issue so that quasi-static
users are served by Li-Fi attocells while moving users are served
by a Wi-Fi AP. However, due to user movement, local overload
situations may occur which prevent handover, leading to a lower
throughput. This research studies LB in a hybrid Li-Fi/Wi-Fi
network by taking into account user mobility and handover
signalling overheads. Furthermore, a dynamic LB scheme is
proposed, where the utility function considers system throughput
and fairness. In order to better understand the handover effect
on the LB, the service areas of different APs are studied, and the
throughput of each AP by employing the proposed LB scheme
is analysed.

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