Hypergraph Based Resource Allocation Algorithms for VLC Network With Heterogeneous LEDs and Varied Users

With distinguished advantages over radio frequency communication, visible light communication (VLC) has been considered as one of the potential and promising wireless communication technologies. However, the densely deployed light emitting diode (LED) lamps introduce severe inter channel interference (ICI), which drastically deteriorates the VLC network performance. In addition, the limited wireless access capabilities of heterogeneous LED lamps, as well as the different data transmission requirements of varied user equipments (UEs), will bring new challenges to the VLC network in real-life applications. To mitigate the ICI and improve the VLC network performance, the hypergraph theory is introduced in detail. Effective data links between one UE and all of its available LED access points (APs) are taken as a hyperedge to form an amorphous cell for each UE. Considering the UE satisfaction performance, as well as the spectrum efficiency and service fairness, the non-layered resource allocation (RA) algorithm based on carrier aggregation and the directly overlapped RA algorithm based on carrier aggregation and cooperative transmission are proposed. Numeric results show that the proposed RA algorithms outperform the classic Dsatur RA algorithm in terms of the UE satisfaction, spectrum efficiency and service fairness.