A Fully Coordinated New Radio-Unlicensed System for Ultra-Reliable Low-Latency Applications

Roberto Maldonado Cuevas, Claudio Rosa, Klaus Ingemann Pedersen

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

Abstract

Communications over the unlicensed spectrum are susceptible to be delayed by mandatory channel access mechanisms. Based on the need for improving the latency-reliability performance of New Radio-Unlicensed for supporting new usecases, such as industrial applications, different types of channel access are evaluated in this paper. By using asynchronous and demand-driven channel access, it is shown that approximately 50% of the delay experienced by a downlink packet is due to listen before talk (LBT). Furthermore, UEs might be blocked by an unsuccessful uplink LBT losing the opportunity to transmit their previously scheduled data. As an alternative, synchronous channel access is evaluated. By using a coordinated LBT among the nodes, the channel access delay is reduced to a constant value. However, UEs can still be blocked when initiating their uplink transmissions due to neighbours transmissions. Motivated by this fact, an approach in which a central node is in charge of the frame selection is proposed. Therefore, all the nodes in the system are coordinated in both the channel access and the frame configuration. In this case, a latency reduction of 70% as compared to the previously mentioned alternatives is achieved at high loads and 99.9999% reliability.

Original languageEnglish
Title of host publication 2020 IEEE Wireless Communications and Networking Conference (WCNC)
Number of pages6
PublisherIEEE
Publication date19 Jun 2020
Article number9120460
ISBN (Print)978-1-7281-3107-8
ISBN (Electronic)978-1-7281-3106-1
DOIs
Publication statusPublished - 19 Jun 2020
Event2020 IEEE Wireless Communications and Networking Conference (WCNC) - Seoul, Korea, Republic of
Duration: 25 May 202028 May 2020

Conference

Conference2020 IEEE Wireless Communications and Networking Conference (WCNC)
CountryKorea, Republic of
CitySeoul
Period25/05/202028/05/2020
SeriesIEEE Wireless Communications and Networking Conference, WCNC
ISSN1525-3511

Keywords

  • FBE
  • LBE
  • channel access
  • coordination
  • latency
  • listen before talk
  • new radio unlicensed
  • reliability

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