A queueing approach to the latency of decoupled UL/DL with flexible TDD and asymmetric services

Beatriz Soret, Petar Popovski, Kristoffer Stern

Research output: Contribution to journalJournal articleResearchpeer-review

1 Citation (Scopus)
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Abstract

One of the main novelties in 5G is the flexible Time Division Duplex (TDD) frame, which allows adaptation to the latency requirements. However, this flexibility is not sufficient to support heterogeneous latency requirements, in which different traffic instances have different switching requirements between Uplink (UL) and Downlink (DL). This is visible in a traffic mix of enhanced mobile broadband (eMBB) and ultra-reliable low-latency communications (URLLC). In this letter we address this problem through the use of a decoupled UL/DL access, where the UL and the DL of a device are not necessarily served by the same base station. The latency gain over coupled access is quantified in the form of queueing sojourn time in a Rayleigh channel, as well as an upper bound for critical traffic.

Original languageEnglish
Article number8818287
JournalIEEE Wireless Communications Letters
Volume8
Issue number6
Pages (from-to)1704-1708
Number of pages5
ISSN2162-2337
DOIs
Publication statusPublished - 2019

Keywords

  • Two-way communication
  • URLLC
  • decoupled uplink/downlink
  • flexible TDD
  • interactive
  • latency

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