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The fifth generation (5G) mobile technology features the ultra-reliable andlow-latency communications (URLLC) as a major service class. URLLC applicationsdemand a tight radio latency with extreme link reliability. In 5G dynamic timedivision duplexing (TDD) systems, URLLC requirements become further challengingto achieve due to the severe and fast-varying cross link interference (CLI) andthe switching time of the radio frame configurations (RFCs). In this work, wepropose a quasi-dynamic inter-cell frame coordination algorithm using hybridframe design and a cyclic-offset-based RFC code-book. The proposed solutionadaptively updates the RFCs in time such that both the average CLI and theuser-centric radio latency are minimized. Compared to state-of-the-art dynamicTDD studies, the proposed scheme shows a significant improvement in the URLLCoutage latency, i.e., 92% reduction gain, while boosting the cell-edge capacityby 189% and with a greatly reduced coordination overhead space, limited toB-bit.

Quasi-Dynamic Frame Coordination For Ultra- Reliability and Low-Latency in 5G TDD Systems