System Level Analysis of K-Repetition for Uplink Grant-Free URLLC in 5G NR

Thomas Haaning Jacobsen, Renato Barbosa Abreu, Gilberto Berardinelli, Klaus Ingemann Pedersen, István Kovács, Preben E. Mogensen

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

4 Citations (Scopus)
128 Downloads (Pure)


Ultra-reliable low-latency communications (URLLC) sets high service requirements for the fifth generation (5G) new radio (NR) standard. Grant-free (GF) transmissions is considered a promising technique for reducing the latency in the uplink. To achieve efficient radio resources utilization, sharing of resources is required for sporadic uplink traffic. Repetitions based transmission schemes aims to enhance the reliability of GF transmissions. However, repetitions may also generate excessive interference and cause additional queuing, harming the reliability and latency. In this work, we explore radio resource management (RRM) configurations for repetition based transmission schemes. That includes the number of repetitions, the allocation size per transmission (sub-band), sub-band hopping and uplink power control. Evaluations are conducted in a 5G NR compliant multi-user multi-cell simulation scenario with sporadic uplink GF URLLC transmissions. Our findings suggest that repetitions based schemes can, with a careful selection of the sub-band size and uplink power control parameters, achieve comparable URLLC performance with retransmission based schemes when the effect of queuing is disregarded.

Original languageEnglish
Title of host publicationEuropean Wireless 2019 Conference, EW 2019 : 25th European Wireless Conference
Number of pages5
Publication date16 Sep 2019
ISBN (Print)978-3-8007-4948-5
ISBN (Electronic)9783800749492
Publication statusPublished - 16 Sep 2019
EventEuropean Wireless 2019; 25th European Wireless Conference - Aarhus, Denmark
Duration: 2 May 20194 May 2019


ConferenceEuropean Wireless 2019; 25th European Wireless Conference

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