University of Oulu

N. H. Mahmood, R. Abreu, R. Böhnke, M. Schubert, G. Berardinelli and T. H. Jacobsen, "Uplink Grant-Free Access Solutions for URLLC services in 5G New Radio," 2019 16th International Symposium on Wireless Communication Systems (ISWCS), Oulu, Finland, 2019, pp. 607-612. doi: 10.1109/ISWCS.2019.8877253

Uplink grant-free access solutions for URLLC services in 5G new radio

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Author: Mahmood, Nurul Huda1; Abreu, Renato2; Böhnke, Ronald3;
Organizations: 1Center for Wireless Communication, University of Oulu, Finland
2Department of Electronic Systems, Aalborg University, Denmark
3Huawei Technologies Duesseldorf GmbH, Munich Research Center, Germany
4Nokia Bell Labs, Aalborg, Denmark
Format: article
Version: accepted version
Access: open
Online Access: PDF Full Text (PDF, 0.7 MB)
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Language: English
Published: Institute of Electrical and Electronics Engineers, 2019
Publish Date: 2019-12-02


Ultra-reliable low latency communication requires innovative resource management solutions that can guarantee high reliability at low latency. Grant-free random access, where channel resources are accessed without undergoing assignment through a handshake process, is proposed in 5G New Radio as an important latency reducing solution. However, this comes at an increased likelihood of collisions resulting from uncoordinated channel access. Novel reliability enhancement techniques are therefore needed. This article provides an overview of grant-free random access in 5G New Radio focusing on the ultra-reliable low latency communication service class, and presents two reliability-enhancing solutions. The first proposes retransmissions over shared resources, whereas the second proposal incorporates grant-free transmission with non-orthogonal multiple access where overlapping transmissions are resolved through the use of advanced receivers. Both proposed solutions result in significant performance gains, in terms of reliability as well as resource efficiency. For example, the proposed non-orthogonal multiple access scheme can support a normalized load of more than 1.5 users/slot at packet loss rates of ~ 10 -5 a significant improvement over conventional grant-free schemes like slotted—ALOHA.

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Series: International Symposium on Wireless Communication Systems
ISSN: 2154-0217
ISSN-E: 2154-0225
ISSN-L: 2154-0217
ISBN: 978-1-7281-2527-5
ISBN Print: 978-1-7281-2528-2
Pages: 607 - 612
DOI: 10.1109/ISWCS.2019.8877253
Host publication: 2019 16th International Symposium on Wireless Communication Systems (ISWCS) 27-30 August 2019 Oulu, Finland
Conference: International Symposium on Wireless Communication Systems
Type of Publication: A4 Article in conference proceedings
Field of Science: 213 Electronic, automation and communications engineering, electronics
Funding: This work has partly been performed in the framework of the Horizon 2020 project ONE-5G (ICT-760809) receiving funds from the European Union, and partly under the Academy of Finland 6Genesis Flagship (grant no. 318927). The authors would like to acknowledge the contributions of their colleagues in the project, although the views expressed in this work are those of the authors and do not necessarily represent the project.
Academy of Finland Grant Number: 318927
Detailed Information: 318927 (Academy of Finland Funding decision)
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