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Since the advent of ultra-reliable and low-latency communications (URLLC),the requirements of low-latency applications tend to be completelycharacterized by a single pre-defined latency-reliability target. That is,operation is optimal whenever the pre-defined latency threshold is met but thesystem is assumed to be in error when the latency threshold is violated. Thisvision is severely limited and does not capture the real requirements of mostapplications, where multiple latency thresholds can be defined, together withincentives or rewards associated with meeting each of them. Such formulation isa generalization of the single-threshold case popularized by URLLC and, in theasymptotic case, approximates to defining a cost for each point in the supportof the latency distribution. In this paper, we explore the implications ofdefining multiple latency targets on the design of access protocols and on theoptimization of repetition-based access strategies in orthogonal andnon-orthogonal multiple access scenarios with users that present heterogeneoustraffic characteristics and requirements. We observe that the access strategiesof the users can be effectively adapted to the requirements of the applicationby carefully defining the latency targets and the associated rewards.

Heterogeneous radio access with multiple latency targets