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

Electronics ◽  
2019 ◽  
Vol 8 (3) ◽  
pp. 276
Author(s):  
Xiang-Wei Bai ◽  
Qing Li ◽  
Si-Yu Tao
Keyword(s):  
Resource Allocation ◽  
Visible Light ◽  
Bandwidth Allocation ◽  
Blocking Probability ◽  
Visible Light Communication ◽  
System Throughput ◽  
Multiple Features ◽  
Dense Networks ◽  
User Priority ◽  
Priority Model

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%.

scholarly journals A Low-Complexity Resource Allocation Algorithm for Indoor Visible Light Communication Ultra-Dense Networks

2019 ◽  
Vol 9 (7) ◽  
pp. 1391 ◽  
Author(s):  
Xiangwei Bai ◽  
Qing Li ◽  
Yanqun Tang
Keyword(s):  
Resource Allocation ◽  
Visible Light ◽  
Complexity Analysis ◽  
Visible Light Communication ◽  
Low Complexity ◽  
System Throughput ◽  
Resource Allocation Algorithm ◽  
Allocation Algorithm ◽  
Dense Networks ◽  
Average System

In this paper, a low-complexity multi-cell resource allocation algorithm with a near-optimal system throughput is proposed to resolve the conflict between the high system throughput and low complexity of indoor visible light communication ultra-dense networks (VLC-UDNs). First, by establishing the optimal model of the resource allocation problem in each cell, we concluded that the problem is a convex optimization problem. After this, the analytic formula of the normalized scaling factor of each terminal for resource allocation is derived after reasonable approximate treatment. The resource allocation algorithm is subsequently proposed. Finally, the complexity analysis shows that the proposed algorithm has polynomial complexity, which is lower than the classical optimal inter-point method. The simulation results show that the proposed method achieves a improvement of 57% in performance in terms of the average system throughput and improvement of 67% in performance in terms of the quality of service (QoS) guarantee against the required data rate proportion allocation (RDR-PA) method.

scholarly journals Power Allocation of Non-Orthogonal Multiple Access Based on Dynamic User Priority for Indoor QoS-Guaranteed Visible Light Communication Networks

2018 ◽  
Vol 8 (8) ◽  
pp. 1219 ◽  
Author(s):  
Siyu Tao ◽  
Hongyi Yu ◽  
Qing Li ◽  
Xiangwei Bai ◽  
Yanqun Tang
Keyword(s):  
Visible Light ◽  
Power Allocation ◽  
Communication Networks ◽  
User Satisfaction ◽  
Multiple Access ◽  
Visible Light Communication ◽  
Small Cells ◽  
System Throughput ◽  
User Data ◽  
User Priority

Non-orthogonal multiple access (NOMA) simultaneously provides multi-user access over the same frequency band or time period, which can significantly improve system throughput in visible light communication (VLC) networks. However, the different interference components of NOMA and the diversified user requirements in VLC are difficult to coordinate. To guarantee both throughput enhancement and quality of service (QoS) satisfaction, this paper presents a power allocation scheme based on dynamic user priority in indoor NOMA-VLC networks. We introduce fuzzy logic (FL) to flexibly analyse user priority and assign signal power using multi-dimensional user features. The experimental results show that our method achieves the best performance in terms of user fairness and satisfaction. In indoor VLC, which has small cells with a high user density, our method outperforms contrastive schemes in terms of the average user data rate (AUDR). Therefore, in comparisons between static and dynamic user priority, our study indicates the fairness advantages of FL for the dynamic evaluation of user priority. In comparisons between NOMA and orthogonal multiple access, our study reflects the AUDR advantages of non-orthogonal methods. Furthermore, in comparisons of user satisfaction, our method outperforms existing methods, indicating the achievement of the QoS guarantee.

Resource Allocation in Multi-Tier Femtocell and Visible-Light Heterogeneous Wireless Networks

2017 ◽  
pp. 210-246 ◽  
Author(s):  
Eirini Eleni Tsiropoulou ◽  
Panagiotis Vamvakas ◽  
Symeon Papavassiliou
Keyword(s):  
Resource Allocation ◽  
Visible Light ◽  
Power Allocation ◽  
Bandwidth Allocation ◽  
Heterogeneous Wireless Networks ◽  
Interference Management ◽  
Visible Light Communication ◽  
User Association ◽  
Data Traffic ◽  
Increasing Demand

The increasing demand in mobile data traffic, data hungry services and high QoS prerequisites have led to the design of advanced multi-tier heterogeneous cellular networks. In this chapter, a multi-tier heterogeneous wireless network is examined consisting of the macrocell, multiple femtocells and multiple Visible Light Communication (VLC) cells. Distributed resource allocation approaches in two-tier femtocells are presented focusing on (a) power allocation and interference management, (b) joint power and rate allocation, and (c) resource allocation and pricing policies. Similarly, the most prominent resource allocation approaches in two-tier VLC cells are examined, including (a) user association and adaptive bandwidth allocation, (b) joint bandwidth and power allocation, and (c) interference bounded resource blocks allocation and power control. The resource allocation problem in the two-tier heterogeneous environment where both femtocells and VLC-LANs are simultaneously present is also discussed. Finally, detailed future directions and comprehensive conclusions are provided.

scholarly journals Coordinated Resource Allocation-Based Integrated Visible Light Communication and Positioning Systems for Indoor IoT

2020 ◽  
Vol 19 (7) ◽  
pp. 4671-4684
Author(s):  
Helin Yang ◽  
Wen-De Zhong ◽  
Chen Chen ◽  
Arokiaswami Alphones ◽  
Pengfei Du ◽  
...  
Keyword(s):  
Resource Allocation ◽  
Visible Light ◽  
Visible Light Communication ◽  
Positioning Systems
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