Abstract
Light fidelity (LiFi) is a relatively new wireless communication technology that exploits the optical spectrum. Compared to wireless fidelity (WiFi), LiFi is densely deployed with each access point (AP) covering an area only a few meters in diameter. Also, LiFi users are susceptible to intermittent light-path blockages. Meanwhile, the user is served by a single AP in conventional LiFi systems. This would cause frequent handovers for LiFi users, resulting in a degradation in quality of service. In this paper, parallel transmission is investigated for LiFi, which is named PT-LiFi. With a delicate design of the transmitter and the receiver, PT-LiFi enables multiple LiFi APs to serve the user simultaneously. Particularly, data transmission continues without interruption when the user is losing connectivity to some of the connected APs. Resource allocation is studied for the PT-LiFi system, and a novel load balancing method is proposed to jointly allocate resource across the APs. Results show PT-LiFi can make efficient use of the densely deployed LiFi APs and provide a flexible way of load balancing. Compared with a conventional LiFi system, the proposed method can increase user throughput by up to 150% and improve user fairness by up to 15%.
Highlights
L IGHT fidelity (LiFi) is a short-range wireless communication technology that uses light wave as signal bearers [1]
0 ≤ ψi,u ≤ Ψmax, ψi,u > Ψmax where n is the refractive index, Ψmax is the semi-angle of the field of view (FoV) of the PD, and ψi,u denotes the angle of incidence, which is the angle between the incident light and the receiver’s orientation
Parallel transmission was investigated for Light fidelity (LiFi) and a novel resource allocation (RA) method named joint resource allocation (JRA) was proposed
Summary
L IGHT fidelity (LiFi) is a short-range wireless communication technology that uses light wave as signal bearers [1]. In [6], a handover skipping scheme is reported, which enables the user to be transferred between two non-adjacent APs. Using the college admission model, a mobility-aware load balancing approach is developed for hybrid LiFi and long term evolution (LTE) networks in [7]. This is restricted by the conventional transmission control protocol (TCP). Though these methods can improve the network performance of LiFi to some extent, they have two major limitations: i) a complete loss of throughput during handovers; and ii) a limited ability to balance traffic loads because each user can only acquire a portion of the resource of one AP.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
