LiFi is networked, bi-directional wireless communication with light. It is used to connect fixed and mobile devices at very high data rates by harnessing the visible light and infrared spectrum. Combined, these spectral resources are 2600 times larger than the entire radio frequency (RF) spectrum. This paper provides the motivation behind why LiFi is a very timely technology especially for 6 th generation (6G) cellular communications. It discusses and reviews essential networking technologies such as interference mitigation and hybrid LiFi/Wi-Fi networking topologies. We also consider the seamless integration of LiFi into existing wireless networks to form heterogeneous networks across the optical and RF domains and discuss implications and solutions in terms of load balancing. Finally, we provide the results of a real-world hybrid LiFi/Wi-Fi network deployment in a software defined networking (SDN) testbed in a school and show that LiFi networks can improve Wi-Fi network performance significantly by offloading traffic.
A Vehicular network topology changes rapidly due to the high mobility of network nodes. This network is formed spontaneously to support high speed and guaranteed communications, which in turn makes the delivery of emergency warning packets (EW P s) through dynamic routing protocols not guaranteed and unreliable. Hence, we propose a broadcast scheme through which the EW P s in the ad hoc part in Client-Server Ad-Hoc (CSAH) communication platform [1] are transmitted from an abnormal vehicle to others in its zone. This broadcast scheme is efficient since it delivers rapidly the EW P s, and it is adaptive since the rebroadcast probability of a vehicle node changes dynamically in term of the number of vehicle nodes in its zone. Consequently, this broadcast scheme alleviates the problem of the simple flooding broadcast which is referred to broadcast storm and represented by packets redundancy, contention, and collision in the network.
LiFi attocell access networks will be deployed everywhere to support diverse applications and service provisioning to various end-users. The LiFi infrastructure providers will need to offer LiFi access points (APs) resources as a service. This, however, requires a research challenge to be solved to dynamically and effectively allocate resources among service providers (SPs) , while guaranteeing performance isolation among them and their respective users. This paper introduces an autonomic resource slicing (virtualization) scheme, which realizes autonomic management and configuration of virtual APs, in a LiFi attocell access network, based on SPs and their users service requirements. The developed scheme comprises of traffic analysis and classification, a local AP controller, downlink and uplink slice resources manager, traffic measurement and information collection modules. It also contains a hybrid medium access protocol and an extended token bucket fair queueing algorithm to support uplink access virtualization and spectrum slicing. The proposed resource slicing scheme collects and analyzes the traffic statistics of the different applications supported on the slices defined in each LiFi AP and distributes the available resources fairly and proportionally among them. It uses a control algorithm to adjust the minimum contention window of user devices to achieve the target throughput and ensure airtime fairness among SPs and their users. The developed scheme has been extensively evaluated using OMNeT++. The obtained results show various resource slicing capabilities to support differentiated services and performance isolation.
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