Impact of Self-Configuration on Handover Performance in Green Cellular Networks

Ozyurt, Ahmet Burak; Başaran, Mehmet; Durak–Ata, Lütfiye

doi:10.1109/rtuwo.2018.8587893

Cited by 8 publications

(5 citation statements)

References 10 publications

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“…The handover requirement considered in this work is based on received optical intensity ROI. This parameter can decrease the number of unnecessary handovers and effectively avoid ping-pong effects [44].…”

Section: Cross-tier Mobility Analyses For Resilient Lifi a P2s Handover Ratementioning

confidence: 99%

Mobility management in multi-tier LiFi networks

Ozyurt

Popoola

2021

J. Opt. Commun. Netw.

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Mobility management is an important part of the analysis and design of ultra-dense LiFi networks. This paper presents a two-tier LiFi network and analyses the cross-tier handover rate between the primary and secondary cells. For different conditions of semiangle at half illuminance of the primary and secondary cells, we propose three different coverage models for the secondary cells. Using stochastic geometry, closed-form expressions are derived for the cross-tier handover rate, ping-pong rate and sojourn time in terms of the received optical signal intensity, time-to-trigger and user mobility. The analytical models are validated with simulation results.

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Section: Cross-tier Mobility Analyses For Resilient Lifi a P2s Handover Ratementioning

confidence: 99%

Mobility management in multi-tier LiFi networks

Ozyurt

Popoola

2021

J. Opt. Commun. Netw.

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“…The purpose of this study is to complete the criterion weight and value hierarchies used in AHP pairwise comparisons, as seen in Figure 4 . However, the proposed method works to prevent ping-pong (PP) effects [ 75 ]. When a user equipment (UE) time-of-stay within a small cell is shorter than the threshold, and the UE subsequently HO to another AP, the resulting HO is deemed superfluous [ 76 ].…”

Section: Methodsmentioning

confidence: 99%

A Multicriteria Decision-Making Framework for Access Point Selection in Hybrid LiFi/WiFi Networks Using Integrated AHP–VIKOR Technique

Badeel

Subramaniam

Muhammed

et al. 2023

Sensors

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Since light fidelity (LiFi) and wireless fidelity (WiFi) do not interfere with one another, a LiFi/WiFi hybrid network may provide superior performance to existing wireless options. With many users and constant changes, a network can easily become overloaded, leading to slowdowns and fluctuations in data transfer speeds. Access point assignment (APA) is required with the increase of users, which can negatively impact the system performance and quality-of-service (QoS) due to mobility and line-of-sight (LOS) blockage. Many variables could influence the APA process; these variables are considered as criteria, such as the network capacity, the degree of blockage, the speed of the connected user, etc. Unlike conditional APA methods, recent studies have considered treating these variables as “evaluation criteria”. Considering these criteria can offer better and more accurate results, eventually enhancing the APA process and QoS. However, the variety of these criteria, the conflict amongst them, their weights (importance), and priority have not been addressed so far. Moreover, treating the criteria equally might result in inaccurate outcomes. Therefore, to solve this issue, it is essential to investigate the impact of each criterion on the APA process. In this work, a multicriteria decision-making (MCDM) problem is formulated to determine a network-level selection for each user over a period of time The decision problem is modeled as a hierarchy that fragments a problem into a hierarchy of simple and small subproblems, and the selection of the AP network among various alternatives is a considered as an MCDM problem. Based on the previous works, we are not aware of any previous research attempts using MCDM methods in the LiFi research area for network selection. Therefore, this work proposes an access point assignment framework using an MCDM approach for users in a hybrid LiFi/WiFi network. The experiment was conducted based on four phases: (i) Five criteria were identified and evaluated with eleven APs (alternatives). The outcome of this phase was used to build the decision matrix and an MCDM was developed and built based on user mobility and blockages with various scenarios using all the criteria; (ii) The analytic hierarchy process (AHP) was employed to identify the criterion of the subjective weights of each criterion and to determine the degree of importance supported by experts’ judgement. Determining the weights in the AHP process considered various investigations, including the consistency ratio (CR) and the AHP consensus indicator, which is calculated using the rank-based maximum likelihood method (RGMM) and Shannon entropy techniques. The VIekriteri-Jumsko KOmpromisno Rangiranje (VIKOR) method is adopted in the selection of the optimal AP for the proper selection of whether a LiFi or WiFi AP must serve the users. The integrated AHP–VIKOR was effective for solving the APA and was the best solution based on using weighted criteria simultaneously. Moreover, the ranking outcomes of the developed integrated AHP–VIKOR approach were evaluated using sensitivity analysis. The result of this work takes the APA for hybrid LiFi networks to a new perspective.

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“…The expected IIoT dwell time interval in a D2D communication range can be described as residence time [40]. With determined mode changes areas, it is easy to obtain the expected D2D mode residence time.…”

Section: B D2d Residence Timementioning

confidence: 99%

LiFi-Based D2D Communication in Industrial IoT

Ozyurt

Popoola

2023

IEEE Systems Journal

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This paper analyses the performance of LiFi-based device-to-device (D2D) communication in industrial internetof-things (IIoT). We present a comprehensive analysis of mobility management of D2D communication in industrial LiFi networks. Using the semiangle at half illuminance of the AP and D2D transmitting IIoT, a coverage model for the D2D communication range is derived. By adopting stochastic geometry, closed-form expressions for mode selection rate and residence time are derived as functions of the AP density, IIoT density, and velocity. The results have shown that high velocity and denser deployment cause a decrease in the average D2D residence time and an increase in the average D2D transition rate or vice versa. The proposed analytical models are then verified with Monte Carlo simulation results. The results provide system-level design insights.

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Impact of Self-Configuration on Handover Performance in Green Cellular Networks

Cited by 8 publications

References 10 publications

Mobility management in multi-tier LiFi networks

Mobility management in multi-tier LiFi networks

A Multicriteria Decision-Making Framework for Access Point Selection in Hybrid LiFi/WiFi Networks Using Integrated AHP–VIKOR Technique

LiFi-Based D2D Communication in Industrial IoT

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