Flexible resource allocation for device-to-device communication in fdd system for ultra-reliable and low latency communications

Ultra-reliable and low latency communications is envisioned to enable new services and applications with high reliability, availability and low latency, e.g, factory automation, Tactile Internet. Device-to-device communication is one such mean that allows devices to experience benefits in terms of shorter communication latency. Currently most device-to-device communication in frequency-division duplex system occurs in uplink spectrum. However, due to unbalanced cellular traffic in uplink and downlink bands may result poor spectrum utilization of network resource. In this paper, we investigate resource allocation where network offers reliable communication using normal cellular and device-to-device communications. We consider flexible allocation for device-to-device communication in both uplink and downlink bands in a frequency-division duplex system. The network optimizes resource allocation to improve the network rate with 99.999 % availability target. We demonstrate the usability of the proposed protocol in a factory scenario.