Performance Analysis of Bandwidth Allocation Based on Dynamic User Priority for Indoor Visible Light Communication Ultra-Dense Networks

Xiang-Wei Bai,Si-Yu Tao,Qing Li

doi:10.3390/electronics8030276

Abstract

Focusing on the high user density in visible light communication ultra-dense networks (VLC-UDNs), this paper proposes a resource allocation method based on dynamic user priority (DUP). Firstly, this paper establishes the DUP model, which realizes a multi-dimensional measurement for differences of users. Considering the variety of network environments, we dynamically select multiple features of users and achieve the calculation of DUP by fuzzy logic (FL). Secondly, the throughput-maximizing resource allocation (TMRA) scheme with user priority guarantee is proposed. Thirdly, the lower bound of the proposed DUP-TMRA is derived. Simulation results show that the proposed multi-dimensional DUP model outperforms the conventional one-dimensional DUP model and fixed priority model. In addition, the proposed TMRA scheme outperforms the conventional proportion allocation scheme. Finally, in comparisons of system throughput, the proposed DUP-TMRA achieves 4% performance improvement against the conventional required data rate proportion allocation (RPA) method. In comparisons of fairness, DUP achieves the modest performance. In comparisons of satisfaction, when the average blocking probability is higher than 0.45, the proposed DUP-TMRA improves the proportion of satisfied users against the conventional RPA method by up to 17.5%.

Highlights

Visible light communication (VLC) is an emerging wireless communication technology with advantages of large bandwidth and high speed [1]
Focusing on the high user density, this paper study the throughput-maximizing resource allocation (RA) problem based on dynamic user priority (DUP) in single-cell VLC-UDNs. [8,9,10] used the Markov chain model to assign visible multi-color sub-channels, measured user priority based on the types of traffic, and provided better services to the users with higher priority
According to [14,15], we choose the dynamic user priority proportion allocation (DUP-PA) method, the equal proportion allocation (EPA) method and the rate proportion allocation (RPA) method as comparison methods, and they are denoted as DUP-PA, E-PA, and R-PA, respectively

Summary

Introduction

Visible light communication (VLC) is an emerging wireless communication technology with advantages of large bandwidth and high speed [1]. According to the number of light sources and terminals, the indoor VLC networks include a low-density scene and a high-density scene. In a low-density scene represented by the home environment, the number of light sources and the number of terminals is small, while the number of terminals is slightly greater than that of light sources. In a high-density scene represented by large-scale indoor waiting rooms, the number of light sources and terminals is large and the number of terminals is much greater than that of light sources. Compared with the typical parameters of radio frequency ultra-dense networks (RF-UDNs) [4], the parameters of VLC networks in a high-density scene have reached the critical values of the relevant parameters in RF-UDNs. For example, the traffic demand in indoor communication area has reached 10 Mbps/m2 [4]. Due to the high user density, high access point (AP) and high traffic density requirement, the indoor VLC networks should provide

Methods

Results

Conclusion