Optimization of Load Balancing in Hybrid LiFi/RF Networks

Wang, Yunlu; Basnayaka, Dushyantha A.; Wu, Xinzhou; Haas, Harald

doi:10.1109/tcomm.2017.2654249

Cited by 111 publications

(109 citation statements)

References 35 publications

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“…As the network size increases, the number of nodes contending for channel access also increases resulting in increased probability of channel access failure given in (5) and plotted in Figure 9A. As the failure probability of channel access increases, the probability of success in a high number of backoff attempts also increases as given in (11), resulting in large backoff delay given in (12). For both RBT scheme and IEEE 802.15.7 delay increases with increase in the number of nodes.…”

Section: Performance Evaluationmentioning

confidence: 99%

“…However, this small coverage area inherits benefit of the high frequency reuse ratio, thus high bandwidth within a cell. To combat small coverage area and the inability of the light spectrum to cross solid objects that can cause frequent disconnection, hybrid VLC/RF network is proposed . Hybrid VLC/RF network consists of multiple VLC APs and single RF AP covering the whole area of the room where hybrid VLC/RF network is deployed.…”

Section: Introductionmentioning

confidence: 99%

“…To combat small coverage area and the inability of the light spectrum to cross solid objects that can cause frequent disconnection, hybrid VLC/RF network is proposed. 5,[9][10][11] Hybrid VLC/RF network consists of multiple VLC APs and single RF AP covering the whole area of the room where hybrid VLC/RF network is deployed. Most of the literature related to VLC focus on improving the overall performance of the hybrid network.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Reserve before transmit (RBT): VLC MAC layer frame structure for 5G indoor internet applications

Amjad

Qureshi

Jangsher

2018

Trans Emerging Tel Tech

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For achieving high bandwidth, fast, and robust communication in 5G, multiple technologies are needed to work under heterogeneous networks. Visible light communication, due to its high bandwidth, low latency, and small interference area, will be a significant part of 5G along with mmwave. In this paper, a new frame structure has been proposed that implements reserve before transmit scheme. In this scheme, the active portion of the frame starts with contention access‐based reservation period (RP) followed by access point response (RES Reply) and TDMA‐based guaranteed time slots for successful nodes. In contrast to fixed slot assignment in TDMA, contention‐based reservation avoids idle slot wastage due to fixed allotment. Moreover, small reserve packets keep medium busy for a short time, the benefit of which is a lower probability of failed channel access. The proposed scheme has been compared with IEEE 802.15.7 for a sufficiently large length of RP. A Markov model of the system has been developed for analyzing the effect of RP length on the network performance. The result depicts that reserve before transmit–based frame structure provides an increase of 170% in reliability and decrease of 80% in channel access delay as compared to existing IEEE 802.15.7 CSMA/CA‐based access.

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Section: Performance Evaluationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Reserve before transmit (RBT): VLC MAC layer frame structure for 5G indoor internet applications

Amjad

Qureshi

Jangsher

2018

Trans Emerging Tel Tech

View full text Add to dashboard Cite

show abstract

“…We utilize this prediction in our optimization problem. To solve the problem, we first relax the handover efficiency of [5] and replace it with a linear function to render the relaxation of the general problem feasible. Second, the binary allocation variable is relaxed in a novel way suchthat the objective function of the problem is converted into a convex one.…”

Section: B Contributions and Outlinementioning

confidence: 99%

Mobility-Aware Resource Allocation in VLC Networks Using T-Step Look-Ahead Policy

Dastgheib

Beyranvand

Salehi

et al. 2018

J. Lightwave Technol.

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Visible light communication (VLC) uses huge license-free spectral bandwidth of visible light for high-speed wireless communication. Since each VLC access point covers a small area, handovers of mobile users are inevitable. In order to deal with these handovers, developing fast and effective resource allocation algorithms is a challenge. This paper introduces the problem of mobility-aware optimization of resources in VLC networks using the T-step look-ahead policy and employing the notion of handover eff iciency. It is shown that the handover efficiency can correlate the overall performance of the network with future actions based on the mobility of users. Due to the stationary nature of indoor optical wireless channels, future channel state information (CSI) can be predicted by anticipating the future locations of users. A resource allocation algorithm is thus proposed, which uses CSI to dynamically allocate network resources to users. To solve this mathematically intractable problem, a novel relaxation method is proposed, which proves to be a useful tool to develop efficient algorithms for network optimization problems with a proportional fairness utility function. The resulting algorithm is extremely faster than the previous method and awareness of mobility enhances the overall performance of the network in terms of rate and fairness utility function.

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“…[3][4][5][6][7][8] Chalcogenide glass already exists and available for the potential applications. 5,7,[9][10][11][12][13] One of the interesting aspects of light traveling within the ChG is that the change in wavelength range from the infrared to the radio wave (or microwave) that can be used to serve the current bandwidth requirements, where the light fidelity (LiFi) and wireless fidelity (WiFi) are required to use for the increasing bandwidths, [14][15][16][17] where the individual system has been well established and available in the existing networks. However, the interconnection between LiFi and LiFi is expensive; therefore, the search for the new technology is ongoing.…”

Section: Introductionmentioning

confidence: 99%

High‐density WGM probes generated by a ChG ring resonator for high‐density 3D imaging and applications

Youplao

Pornsuwancharoen

Suwanarat

et al. 2018

Micro & Optical Tech Letters

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In this paper, the ultra‐wideband source for light fidelity (LiFi) and high‐density 3D imaging applications is proposed. The system consists of an add‐drop multiplexer. The center ring is formed by the Chalcogenide glass (ChG), which is coupled with two GaAsInP/P side rings. The nonlinear effect within the side rings (phase modulators) is induced in the central ring. The superposition of light signals from side rings generates wider wavelength band, which makes the original input. The output is the set of squeezed light pulses known as whispering gallery mode (WGM) which is generated at the center of the system. Three different input sources are investigated, where the simulated results are comparatively plotted and discussed. The results show that the wavelength of 1.30 μm is the best input source. The output wavelengths band is ranged from 0.7‐3.1 μm, which is suitable for LiFi source and high‐density 3D imaging applications.

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Optimization of Load Balancing in Hybrid LiFi/RF Networks

Cited by 111 publications

References 35 publications

Reserve before transmit (RBT): VLC MAC layer frame structure for 5G indoor internet applications

Reserve before transmit (RBT): VLC MAC layer frame structure for 5G indoor internet applications

Mobility-Aware Resource Allocation in VLC Networks Using T-Step Look-Ahead Policy

High‐density WGM probes generated by a ChG ring resonator for high‐density 3D imaging and applications

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