Abstract
The hybrid light fidelity (LiFi) and wireless fidelity (WiFi) network (HLWNet) is considered to be a potential component of the next generation indoor wireless networks. However, due to the susceptible line-of-sight propagation of optical signal and the ultra-dense deployment of LiFi access points, the handover problem in the HLWNet becomes challenging and it is hard to design a handover scheme that adapts to complex indoor working scenarios. In this paper, we propose a novel handover scheme, in which the handover events in HLWNet are classified into three categories and a particular strategy for each category is applied to calculate the optimal dwell time in the handover procedure. The proposed handover scheme is adaptive to different working situations, since the information about multiple attributes, such as channel quality, user velocity, and arrivals data rate, is gathered to make the handover decision and to calculate the dwell value. The simulation results show that, compared to the benchmarks, the proposed method is able to increase the user throughput by around 65%, decrease the handover rate by up to 80%, and reduce the packet delay by up to 57%. In addition, the proposed method significantly improves the robustness performance of user throughput and handover rate under different scenarios.
Highlights
M OBILE data traffic is expected to reach 77 exabytes per month in 2022, when it is predicted that 90% of the global mobile data will be consumed by smart devices and 80% of the data activity will occur indoor [1]
We propose a novel handover scheme that firstly determines the type of the vertical handover (VHO) event by the gathered information about channel qualities, user movement, and the arrival data rate
The VHOs in the hybrid LiFi and WiFi network (HLWNet) are divided into three categories and each of them applies a particular strategy to calculate dwell dime
Summary
M OBILE data traffic is expected to reach 77 exabytes per month in 2022, when it is predicted that 90% of the global mobile data will be consumed by smart devices and 80% of the data activity will occur indoor [1]. LiFi is more power-efficient and less expensive than indoor RF wireless networks, e.g. wireless fidelity (WiFi), since it uses inexpensive light emitting diodes (LEDs) as access points (APs) which provide illumination and data transmission at the same time. To enhance user mobility and signal continuity, the concept of the hybrid LiFi and WiFi network (HLWNet) has been introduced [6]. This hybrid network, combining the high-speed data transmission of LiFi and the ubiquitous coverage of WiFi, has been proven to achieve greater throughput and better quality of service (QoS) than a stand-alone LiFi or WiFi network [7]. Despite the clear advantages of an HLWNet, the handover issue in it becomes more challenging due to the LoS optical signal and ultra-dense deployment of LiFi APs
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