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One of the main novelties in 5G is the flexible Time Division Duplex (TDD)frame, which allows adaptation to the latency requirements. However, thisflexibility is not sufficient to support heterogeneous latency requirements, inwhich different traffic instances have different switching requirements betweenUplink (UL) and Downlink (DL). This is visible in a traffic mix of enhancedmobile broadband (eMBB) and ultra-reliable low-latency communications (URLLC).In this paper we address this problem through the use of a decoupled UL/DLaccess, where the UL and the DL of a device are not necessarily served by thesame base station. The latency gain over coupled access is quantified in theform of queueing sojourn time in a Rayleigh channel, as well as an upper boundfor critical traffic.

A queueing approach to the latency of decoupled UL/DL with flexible TDD and asymmetric services