Abstract
Abstract Visible light communication (VLC) is gaining increasing attention and is considered as a promising technology for future wireless indoor communications. Because movable users expect a seamless connectivity experience when switching among transmitters (i.e., VLC access points) in the VLC system, fast link switching operations must be supported by the networks. This paper presents a novel hard link switching scheme for VLC networks with the use of pre-scanning and received signal strength (RSS) prediction. Our proposed scheme achieves the advantages of both conventional hard and soft link switching schemes without changing device hardware or the IEEE 802.15.7 medium access control (MAC) protocol. To help compare our proposed scheme with conventional hard and soft link switching schemes, the signal-to-interference-plus-noise ratio (SINR), the outage probability regarding the link switching situation, and the queuing models for link switching schemes are taken into account. Simulation and numerical results validate that our proposed scheme outperforms conventional hard and soft link switching schemes.
Highlights
Because the requirements for wireless data communication continually increase, the radio frequency spectrum is becoming congested
We propose a novel hard link switching scheme for visible light communication (VLC) networks, using a pre-scanning method and a received signal strength (RSS) prediction scheme, to overcome some drawbacks of conventional hard and soft link switching schemes
We focus on analyzing the outage probability with respect to three link switching schemes, which are conventional hard link switching, conventional soft link switching, and our proposed link switching
Summary
Because the requirements for wireless data communication continually increase, the radio frequency spectrum is becoming congested. Commonly known as handover in other wireless communication technologies, is an essential issue that deals with the mobility of end users (the term ‘link switching’ is used in the IEEE 802.15.7 standard instead of ‘handover’). It guarantees seamless connectivity or improves the quality of service (QoS). The rest of this paper is organized as follows: Section 2 describes the system model of VLC networks including the optical channel model, IEEE 802.15.7 MAC, and link switching fundamentals. Pr 1⁄4 Hð0ÞPt; ð1Þ where Pt is the transmitted power, Pr is the received power, and H(0) is the channel DC gain
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