Movable Access Points in Visible Light Communications: Opportunities, Challenges and Future Directions

TL;DR

This paper explores the use of movable access points in visible light communication systems to improve connectivity, coverage, and data rates, especially for mobile users, by dynamically repositioning access points.

Contribution

It introduces the novel concept of MAPs in VLC systems, demonstrating their advantages over RIS-aided and fixed-AP systems through simulation results.

Findings

MAPs outperform RIS-aided VLC in dynamic environments

Dynamic repositioning improves line-of-sight connectivity

MAPs provide higher data rates for mobile users

Abstract

Visible light communication (VLC) is expected to be a key component of future wireless networks due to its abundant license-free spectrum, inherent high-level security, and the already deployed lighting infrastructure. VLC performance, however, depends on device orientation and the availability of an unobstructed line-of-sight (LoS) link, with transmitter semi-angle and receiver field-of-view (FoV) further affecting alignment, coverage, and reliability. Reconfigurable intelligent surfaces (RISs) can mitigate blockages, orientation issues, and mobility challenges, but their data rates remain far below those of direct LoS links. This article introduces the novel concept of movable access points (MAPs)-aided VLC systems, where dynamically repositioned APs provide new degrees of freedom to ensure LoS connectivity, and transmitter-receiver alignment while providing ultra-high data rates for mobile users. Simulation results show MAPs outperform RIS-aided, fixed-AP, and RIS-only VLC systems in dynamic environments. The article also outlines key challenges and future research directions, including integration with emerging wireless technologies.