  Ultra-reliability and low-latency are two key components in 5G networks. In
this letter, we investigate the problem of ultra-reliable and low-latency
communication (URLLC) in millimeter wave (mmWave)-enabled massive
multiple-input multiple-output (MIMO) networks. The problem is cast as a
network utility maximization subject to probabilistic latency and reliability
constraints. To solve this problem, we resort to the Lyapunov technique whereby
a utility-delay control approach is proposed, which adapts to channel
variations and queue dynamics. Numerical results demonstrate that our proposed
approach ensures reliable communication with a guaranteed probability of
99.99%, and reduces latency by 28.41% and 77.11% as compared to baselines with
and without probabilistic latency constraints, respectively.
