Joint Optimization of Power Allocation and Load Balancing for Hybrid VLC/RF Networks

Obeed, Mohanad; Salhab, Anas M.; Zummo, Salam A.; Alouini, Mohamed‐Slim

doi:10.1364/jocn.10.000553

Cited by 76 publications

(61 citation statements)

References 22 publications

(57 reference statements)

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“…One of this paper goals is to optimize the VLC systems performance, a topic which is extensively studied in the literature of VLC systems, either by supplementing the network with additional RF APs [9]- [12], or by applying VLC APs cooperation [13]- [16].…”

Section: B Related Workmentioning

confidence: 99%

DC-Bias and Power Allocation in Cooperative VLC Networks for Joint Information and Energy Transfer

Obeed

Dahrouj

Salhab

et al. 2019

IEEE Trans. Wireless Commun.

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Visible light communications (VLC) have emerged as strong candidates for meeting the escalating demand for high data rates. Consider a VLC network, where multiple access-points (APs) serve both energy-harvesting users (EHUs), i.e., users which harvest energy from light intensity, and information-users (IUs), i.e., users which gather data information. In order to jointly balance the achievable sum-rate at the IUs and the energy harvested by the EHUs, the paper considers maximizing a network-wide utility, which consists of a weighted-sum of the IUs sum-rate and the EHUs harvestedenergy, subject to individual IU rate constraint, individual EHU harvested-energy constraint, and AP power constraints, so as to jointly determine the direct current (DC)-bias value at each AP, and the users powers. The paper solves such a difficult non-convex optimization problem using an iterative approach which relies on inner convex approximations, and compensates for the used approximations using proper outer-loop updates. The paper further considers solving the special cases of the problem, i.e., maximizing the sum-rate, and maximizing the total harvested-energy, both subject to the same constraints. Numerical results highlight the significant performance improvement of the proposed algorithms, and illustrate the impacts of the network parameters on the performance trade-off between the sum-rate and harvested-energy.

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Section: B Related Workmentioning

confidence: 99%

DC-Bias and Power Allocation in Cooperative VLC Networks for Joint Information and Energy Transfer

Obeed

Dahrouj

Salhab

et al. 2019

IEEE Trans. Wireless Commun.

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“…For this reason, load balancing becomes essential for HLWNets. A considerable quantity of research has been conducted to tackle this issue [8]- [10]. With proportional fairness resource allocation, the load balancing issue was formulated as an optimisation problem in [8].…”

Section: Introductionmentioning

confidence: 99%

“…In [9], an APS method based on fuzzy logic was reported, which is able to achieve near-optimal performance at significantly reduced computational complexity. The authors in [10] proposed an iterative algorithm to jointly solve load balancing and power allocation.…”

Section: Introductionmentioning

confidence: 99%

“…Due to different media access control (MAC) protocols, a VHO usually requires a much longer processing time than a HHO [12]. Using the load balancing methods in [8]- [10] might cause frequent and unnecessary VHOs, leading to a compromise in throughput. Also, LiFi APs have a relatively small coverage area, of approximately 2-3m in diameter [13].…”

Section: Introductionmentioning

confidence: 99%

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Load Balancing for Hybrid LiFi and WiFi Networks: To Tackle User Mobility and Light-Path Blockage

Haas

2020

IEEE Trans. Commun.

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Combining the high-speed data transmission of light fidelity (LiFi) and the ubiquitous coverage of wireless fidelity (WiFi), hybrid LiFi and WiFi networks (HLWNets) are recently proposed to improve the system capacity of indoor wireless communications. Meanwhile, load balancing becomes a challenging issue due to a complete overlap between the coverage areas of LiFi and WiFi. User mobility and light-path blockages further complicate the process of load balancing, since the decision for a horizontal or a vertical handover in a mobile environment with ultra-small cells is non-trivial. These issues are managed separately in most conventional methods, which might cause frequent handovers and compromise throughput. A few studies address these issues jointly for selecting access points at each time instant but require excessive computational complexity. In this paper, a joint optimisation problem is formulated to determine a network-level selection for each user over a period of time. A novel algorithm based on fuzzy logic is also proposed to reduce the computational complexity that is required to solve the optimisation problem. Results show that compared to the conventional method, the proposed approach can improve system throughput by up to 68%, while achieving very low computational complexity. Index Terms-Light fidelity (LiFi), hybrid network, load balancing, user mobility, light-path blockage

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“…The evolving explosion in high data rate services and applications has pushed the attention in the research community to utilize the untapped abundant unregulated voptical spectrum for communications to meet the fifth-generation (5G) and beyond traffic demand. The radio-frequency (RF) networks are proving to be scarce to cover the escalation in data rate services [1], and therefore, optical wireless communication (OWC) has emerged as a great potential solution or as a complementary to the existing RF networks to support the predicted traffic demand. Compared to their RF counterparts, OWC technologies can offer several advantages such as providing high data rates, rejecting RF interference, and providing energy-efficient wireless systems.…”

Section: Introductionmentioning

confidence: 99%

Survey on Physical Layer Security in Optical Wireless Communication Systems

Obeed

Salhab

Alouini

et al. 2018

2018 Seventh International Conference on Communications and Networking (ComNet)

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As the existing radio-frequency (RF) networks cannot meet the ever-increasing data rate demand, the optical wireless communication (OWC), which uses a wide untapped unregulated spectrum, has been proposed as a promising technology to overcome the RF spectrum limitations. On the other hand, with the increasing demand for high data rate and the prevalence of the broadcast-nature networks, researchers have recently come up with new mechanisms to improve secure communication using physical layer techniques. Compared to RF networks, the OWC networks are more secure and less susceptible to the interception because of the small coverage provided by LEDs, and because they work properly only in the presence of the line-of-sight (LoS) components. However, the security in OWC networks is still an issue, especially in visible light communication (VLC) when the transmitted information can be accessed by multiple users as in public areas, meeting rooms, laboratories, and libraries. That means potential eavesdroppers may be existing to gather confidential messages. This paper reviews all the conducted work on physical layer security (PLS) in two types of OWC networks, which are the VLC and free space optical (FSO) networks. Furthermore, the paper proposes several open problems in these networks to optimize and enhance the security performance.

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Joint Optimization of Power Allocation and Load Balancing for Hybrid VLC/RF Networks

Cited by 76 publications

References 22 publications

DC-Bias and Power Allocation in Cooperative VLC Networks for Joint Information and Energy Transfer

DC-Bias and Power Allocation in Cooperative VLC Networks for Joint Information and Energy Transfer

Load Balancing for Hybrid LiFi and WiFi Networks: To Tackle User Mobility and Light-Path Blockage

Survey on Physical Layer Security in Optical Wireless Communication Systems

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