Tradeoff between reliability and channel utilization efficiency for 5G NR in unlicensed spectrum

Jing Liu, Qimei Cui, Jian Zhang, Wei Ni, Zesong Fei, Yong Li

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Citation (Scopus)

Abstract

With the development of next fifth generation (5G) communication system, unlicensed spectrum has been considered as a central candidate to offload data traffic. In addition to the most important issue of fair coexistence with Wi-Fi, another problem is to reduce the transmission latency in unlicensed band. Grant-free can be used as an important solution to reduce latency by randomly accessing without scheduling, but it brings lower reliability. In this paper, the grant-free uplink transmission with multiple transmission times (GUL-M) is introduced into the coexistence system of Wi-Fi and new radio in unlicensed band (NR-U) to improve transmission reliability by transmitting one data packet several times at the same time. Based on Markov chain model, the performance of coexistence system is analyzed by deriving the transmission probability and collision probability of Wi-Fi and NR-U with GUL-M. Corroborated by simulations, our approach can achieve the tradeoff between reliability and channel utilization efficiency by dynamically adjusting the transmission times, which shows that as the transmission times increases, there is a maximum throughput efficiency for both NR-U with GUL-M and the coexistence system.

Original languageEnglish
Title of host publicationIET Conference Publications
PublisherInstitution of Engineering and Technology
Pages77-82
Number of pages6
EditionCP768
ISBN (Print)9781839531637
DOIs
Publication statusPublished - 2019
EventIET 8th International Conference on Wireless, Mobile and Multimedia Networks - Beijing, China
Duration: 15 Nov 201917 Nov 2019

Publication series

NameIET Conference Publications
NumberCP768
Volume2019

Conference

ConferenceIET 8th International Conference on Wireless, Mobile and Multimedia Networks
Country/TerritoryChina
CityBeijing
Period15/11/1917/11/19

Keywords

  • Coexistence
  • GUL-M
  • Grant-free
  • Multiple transmission times
  • NR-U
  • Tradeoff
  • Unlicensed spectrum
  • Wi-Fi

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Cite this

Liu, J., Cui, Q., Zhang, J., Ni, W., Fei, Z., & Li, Y. (2019). Tradeoff between reliability and channel utilization efficiency for 5G NR in unlicensed spectrum. In IET Conference Publications (CP768 ed., pp. 77-82). (IET Conference Publications; Vol. 2019, No. CP768). Institution of Engineering and Technology. https://doi.org/10.1049/cp.2019.1153