On Advanced Relay Schemes to Support Throughput-Hungry IoT Applications

A significant challenge to support throughput-hungry internet of thing (IoT) applications is to satisfy the requirement of high data rate using cost-efficient IoT devices in 5G cellular network. To address this challenge, we propose to deploy high-capability relay devices nearby cost-efficient IoT devices. By exploiting the higher transmission/reception capability of the relay device, IoT devices in cell edge can reach boosted throughput even though the relay device introduces additional latency for decode-and-forward. Moreover, we propose the multi-path scheme and uplink (UL)/SL resource sharing scheme to further boost throughput when SL resource is relatively insufficient, wherein SL resource is the resource for communications between IoT devices and their IoT Gateway. Simulation results show that the proposed scheme multiplies throughput for cell-edge IoT devices and can enhance throughput for cell-center IoT devices as well when the system traffic load is high.