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We consider a massive Internet of Things (IoT) scenario where indoor IoTdevices access the network via optical wireless communication (OWC) IoT systemsthat relay data via a backhaul radio frequency (RF) low-power wide-area network(LP WAN). We propose a novel two-tier multi-rate Slotted ALOHA (SA) systemmodel to design and analyse such hybrid OWC/RF networks. For a particularhybrid OWC/RF setup, we present an in-depth numerical investigation thatprovides insights into the proposed two-tier multi-rate hybrid OWC/RF SA systemdesign.

Two-Tier Multi-Rate Slotted ALOHA for OWC/RF-Based IoT Networks