User-Centric Visible Light Communications for Energy-Efficient Scalable Video Streaming

Abstract

Abstract-An energy-efficient indoor visible light communication (VLC) system relying on dynamic user-centric (UC) cluster formation is designed for scalable video streaming. Explicitly, the radically new UC cluster formation technique is based on an amorphous user-to-network association structure, which is ultimately the basis of our energy-efficient indoor VLC system. Furthermore, in order to optimise the system-level energy efficiency, our objective function is selected by jointly considering both the video quality and the power consumption. We then propose a 3-tier dynamic-programming-based algorithm for user/layer-level adaptive modulation mode assignment, for access-point-level power allocation and for cluster-level energy efficiency optimisation, respectively. Based on a scalable video coded sequence, our simulation results demonstrate the superior performance of our UC clusters compared to the conventional cell design in terms of its energy efficiency, throughput as well as video quality in most of the scenarios considered.

Optimization of Visible-Light Optical Wireless Systems: Network-Centric Versus User-Centric Designs

“…Against the above-mentioned network-centric design philosophy, a UC cluster formation regime is proposed and studied in [22], [89]- [91], [94]- [96], as a beneficial counterpart of the existing network-centric cells. By definition, UC design is different from the network-centric design, where the network configuration is fixed, regardless of the tele-traffic.…”

“…An example of the UC design principle is shown in Figure 12 [91]. The UEs' location information is assumed to be accurately acquired, which is also an ongoing research topic in the context of VLC networks [103].…”

“…Fig. 12: Steps of UC cluster formation [91]. The subfigures (a)-(c) illustrate the formation of the UE set for a specific UC cluster.…”

“…On the other hand, [90] focused on the energy efficiency of the hitherto unexplored UC-VLC networks, despite the fact that most of the VLC research aimed for increasing the attainable throughput. Furthermore, the application of the UC-VLC networks was further explored in [91], [96]. Explicitly, a combined triangulation-based and fingerprinting-based positioning technique was proposed for UC-VLC networks in [96], which is capable of achieving a high positioning accuracy at an appealingly low complexity.…”

“…Explicitly, a combined triangulation-based and fingerprinting-based positioning technique was proposed for UC-VLC networks in [96], which is capable of achieving a high positioning accuracy at an appealingly low complexity. In [91], an energy-efficient indoor VLC system relying on dynamic UC cluster formation was designed for scalable video streaming, in order to further realize the energy efficiency potential of VLC.…”