Uplink grant-free access solutions for URLLC services in 5G new radio
Mahmood, Nurul Huda; Abreu, Renato; Böhnke, Ronald; Schubert, Martin; Berardinelli, Gilberto; Jacobsen, Thomas H. (2019-10-21)
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
© 2019 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
https://rightsstatements.org/vocab/InC/1.0/
https://urn.fi/URN:NBN:fi-fe2019120245248
Tiivistelmä
Abstract
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.
Kokoelmat
- Avoin saatavuus [31657]