Research and Improvement of Handover Mechanisms in Li-Fi Networks to Enhance Quality of Service
Students Name: Kozlov Ihor Vasylovych
Qualification Level: magister
Speciality: System Administration of Telecommunications Networks
Institute: Institute of Telecommunications, Radioelectronics and Electronic Engineering
Mode of Study: full
Academic Year: 2024-2025 н.р.
Language of Defence: ukrainian
Abstract: Li-Fi networks, which operate based on optical wireless data transmission, offer prospects for significantly increasing data transfer speeds and reducing latency compared to traditional radio frequency networks [1]. However, due to their limited coverage area and sensitivity to physical obstructions, the Handover process becomes critically important for ensuring Quality of Service (QoS) [2]. Challenges such as delays during access point transitions, data loss, and reduced throughput significantly affect the user experience. This work examines the key challenges associated with Handover processes in Li-Fi networks and proposes methods for their improvement. Specifically, adaptive network management approaches are considered, such as RSS- and SNR-based mechanisms, methods utilizing adaptive threshold values, and load balancing techniques [3]. The primary focus is on evaluating the efficiency of the proposed approaches through modeling and simulation, as well as their impact on improving key QoS metrics, such as latency, throughput, and Handover failure rates. The results obtained can be used to optimize Handover processes in Li-Fi networks, thereby enhancing network efficiency and user satisfaction. The objective of this bachelor’s qualification work is to enhance the Quality of Service in Li-Fi networks by developing and improving Handover mechanisms [4]. Achieving the stated goal is carried out by solving the following tasks: 1. Analyze the features of Li-Fi technology and the challenges of Handover. 2. Study existing methods for improving QoS in Li-Fi networks. 3. Develop a mathematical model to simulate the Handover process. 4. Perform simulations and evaluate the efficiency of various Handover methods. 5. Propose improved approaches to Handover considering QoS requirements. Object of the study: Li-Fi networks and their Handover mechanisms. Subject of the study: Mechanisms for ensuring Quality of Service. Research methods: Evaluating the impact of different Handover methods on the Quality of Service in Li-Fi networks. The first section provides an overview of Li-Fi technology, including its features, network components, and access point design. It details the Handover process and the main issues related to connection loss and QoS degradation in Li-Fi networks. The second section analyzes existing approaches to addressing Handover challenges, identifies key QoS metrics, and suggests methods for improving these metrics to ensure connection stability. The third section focuses on simulating Handover processes in Li-Fi networks: it describes the network model, performs simulations of Handover methods (SNR, RSS, Adaptive Threshold, Load Balancing), and proposes approaches to improve them. The fourth section is dedicated to analyzing the simulation results, assessing the efficiency of the proposed methods, and providing recommendations for practical application in Li-Fi networks. Keywords: Li-Fi, Handover, Quality of Service (QoS), SNR, RSS, Adaptive Threshold, Load Balancing, modeling, optimization, communication networks, data transmission.