| Sumari: | This work studies the quality of service (QoS)
performance of wireless networks that integrate light fidelity
(LiFi) and wireless fidelity (WiFi). While the hybrid network is
potential for improving network capacity, load balancing becomes
essential and challenging due to the nature of heterogeneous
access points (APs). A number of studies have been conducted to
address this issue, focusing on maximising the network capacity
with user fairness constraints. However, in practice, QoS metrics
including packet loss ratio and latency are important to network
services. In this paper, QoS-driven load balancing is studied for
hybrid LiFi and WiFi networks (HLWNets) in two scenarios:
single-AP association (SA) and multi-AP association (MA). In
each case, an optimisation problem is formulated to minimise
the packet loss ratio and latency, and a low-complexity iterative
algorithm is proposed to solve the problem. Results show that the
novel methods, especially MA, can effectively balance the traffic
loads among the APs and improve the QoS performance. In
addition, the more subflows the better performance MA provides.
Targeting the same level of QoS, MA can achieve a system
throughput up to 160% higher than the signal strength strategy
and 130% higher than the proportional fairness load balancing.
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