The very low block error rate (BLER) targets required in ultra-reliable low-latency communications (URLLC) call for new channel state information (CSI) feedback enhancements for an accurate link adaptation (LA) in the radio interface. This paper describes and analyses two new feedback reporting types, in addition to the legacy positive and negative acknowledgements (ACK/NACK) feedback, based on a form of soft-ACK reports. The aim is to improve the outer loop link adaptation (OLLA) accuracy in 5G New Radio (5G NR) based URLLC wireless communications systems where the amount of NACK events will be negligible. These schemes are based on the physical downlink data channel (PDSCH) decoding performance. In particular, the methods are based on an indication of the decoding margin of a PDSCH transmission, for the so-called Scheme A, and on an indication of the estimated block error probability (BLEP) of a PDSCH transmission, for the so-called Scheme B. In addition, two interference measurement (IM) approaches are analysed and compared based on non zero power CSI reference signal (NZP CSI-RS) and CSI interference measurement (CSI-IM) resources. The results show that Scheme A does not converge to any predefined BLER target while Scheme B allows faster convergence times towards the predefined target compared to legacy OLLA scheme. These results indicate that a new feedback reporting approach based on the estimated BLEP is suitable to achieve the tight latency requirements in URLLC scenarios together with efficient radio link performance.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Outer Loop Link Adaptation Enhancements for Ultra Reliable Low Latency Communications in 5G


    Contributors:


    Publication date :

    2022-06-01


    Size :

    812138 byte





    Type of media :

    Conference paper


    Type of material :

    Electronic Resource


    Language :

    English



    Interference Distribution Prediction for Link Adaptation in Ultra-Reliable Low-Latency Communications

    Brighente, Alessandro / Mohammadi, Jafar / Baracca, Paolo | IEEE | 2020


    Towards Ultra-Reliable Low-Latency Underwater Optical Wireless Communications

    Alghamdi, Rawan / Saeed, Nasir / Dahrouj, Hayssam et al. | IEEE | 2019


    On Parallel Retransmission for Uplink Ultra-Reliable and Low Latency Communications

    Chiang, Te-Wei / Liang, Hung-Hsiang / Wang, Sheng-Shih et al. | IEEE | 2019


    NOMA and UAV Scheduling for Ultra-Reliable and Low-Latency Communications

    Xiaowu Liu / Xihan Xu / Kan Yu | DOAJ | 2023

    Free access

    Dual-mode Ultra Reliable Low Latency Communications for Industrial Wireless Control

    Zhou, Liang / Tirkkonen, Olav / Parts, Ulo et al. | IEEE | 2022