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Enabling ultra-reliable and low-latency communication services whileproviding massive connectivity is one of the major goals to be accomplished infuture wireless communication networks. In this paper, we investigate theperformance of a hybrid multi-access scheme in the finite blocklength (FBL)regime that combines the advantages of both non-orthogonal multiple access(NOMA) and time-division multiple access (TDMA) schemes. Two latency-sensitiveapplication scenarios are studied, distinguished by whether the queuingbehaviour has an influence on the transmission performance or not. Inparticular, for the latency-critical case with one-shot transmission, we aim ata certain physical-layer quality-of-service (QoS) performance, namely theoptimization of the reliability. And for the case in which queuing behaviourplays a role, we focus on the link-layer QoS performance and provide a designthat maximizes the effective capacity. For both designs, we leverage thecharacterizations in the FBL regime to provide the optimal framework by jointlyallocating the blocklength and transmit power of each user. In particular, forthe reliability-oriented design, the original problem is decomposed and thejoint convexity of sub-problems is shown via a variable substitution method.For the effective-capacity-oriented design, we exploit the method of Lagrangemultipliers to formulate a solvable dual problem with strong duality to theoriginal problem. Via simulations, we validate our analytical results ofconvexity/concavity and show the advantage of our proposed approaches comparedto other existing schemes.

Low-Latency Hybrid NOMA-TDMA: QoS-Driven Design Framework