Securing uRLLC in UAV-assisted NOMA Wireless Network

Ultra reliable and low latency communication (uRLLC) plays an important role in future wireless communication systems. UAVs are expected to accelerate the implementation of uRLLC by establishing line-of-sight (LoS) communications. However, since the inherent openness of the wireless channel and potential LoS link between UAVs and eavesdroppers, UAV-assisted uRLLC faces more tough challenging issues. In this pa-per, by utilizing non-orthogonal multiple access (NOMA), which can provide effective coverage to wireless users simultaneously, we focus on the security of UAV-assisted uRLLC in terms of physical layer security (PLS) schemes. Specifically, considering limited block length for satisfying low latency of uRLLC, under with the decoding error probability (DEP) cannot be ignored arbitrarily, we propose an analytical framework in the context of UAV-assisted uRLLC. In the framework, an effective secrecy performance called DEP based secrecy transmission capacity (DEP-STC) is designed to measure the security level of UAV-assisted uRLLC systems. Simulations evaluate the effectiveness and precision of our derived theoretical results, and indicate that our proposed framework can obtain a higher security of UAV-assisted uRLLC scenarios.