Handoff Management in Light Fidelity Networks

Abstract

Handoff Management in Light Fidelity Networks Many technologies have been considered to handle the speedy developing range of cell phones and their extended requests for service providers. Among those technologies, Li-Fi is the one that can provide better communication and cover the spectrum shortage. However, Li-Fi has a short range and different service outages. Therefore, Li-Fi is integrated with Wi-Fi to provide better communication in the form of a hybrid Wi-Fi Li-Fi system. This thesis investigates handoff in hybrid light fidelity (Li-Fi) and wireless fidelity (Wi-Fi) networks, i.e., HLWNets. The hybrid network has more challenges to overcome the issue of the small spectrum regions of Li-Fi access points and the interference issue of two different networks. Li-Fi has a short coverage range, while Wi-Fi covers a great area. Due to this, to provide reliable coverage in HLWNets, we integrated Li-Fi networks with Wi-Fi networks. In HLWNets, we face the issue of frequent handoffs. Different methods have been introduced to resolve this issue. In this research, our proposed method is presented based on a signal-to-interference ratio (SINR) scheme instead of reference signal received power (RSRP) because it is a standard scheme but requires additional signals during transmission. The simulation results show that the proposed technique reduces frequent handoffs between Wi-Fi and Li-Fi. During the proposed method, we introduced the AWGN channel while transmitting data from the transmitter to provide reliable data on the receiver. This method also offers better throughput than a standalone Li-Fi system. We have developed a simulation network with handoff between fully working access points of hybrid Li-Fi and Wi-Fi. The simulation results work on the throughput and diminish the packet delay and drop ratio. The algorithm used for load balancing is based on evolutionary game theory for hybrid Li-Fi/Wi-Fi networks. The proposed greedy algorithm also overcomes the frequent handoffs in a hybrid Li-Fi/Wi-Fi network and provides rapid information transmission that improves the quality of service (QoS). We used vertical handoff and horizontal handoff based on the threshold. The greedy algorithm is used to decrease the data loss and improve throughput. The user is connected to a Li-Fi access point (AP) mostly. When light intensity decreases, we communicate to other AP based on the threshold value. If no high-intensity Li-Fi AP is available, the user is associated with Wi-Fi AP. The RSSI method moves the user from VIII Wi-Fi AP to Li-Fi AP. This process decreases the data loss rate and improves throughput and fast data transmission.