Joint Blocklength and Power Optimization for Half Duplex Unmanned Aerial Vehicle Relay System with Short Packet Communications

摘要

To investigate the performance of unmanned aerial vehicle (UAV) assisted machine type communications (MTC), this paper proposes a joint transmit power and blocklength optimization scheme for half duplex UAV relay system with short packet communications. Different from the majority of exiting works about UAV-assisted communications where the blocklength of information to be transmitted is infinite, short packet is considered in this paper to achieve ultra-reliable and low-latency communications (URLLC) in the scenarios of MTC. To fully explore the performance of short packet communications in UAV relay system, transmit power and blocklength, under the constraints of reliability and latency, are jointly optimized to maximize the total effective amount of transmitted information. Simulation results show that the proposed scheme can achieve almost the same performance as the exhaustive search method and outperforms the benchmark schemes.