MU-MIMO enabled uplink OFDMA MAC protocol in dense IEEE 802.11ax WLANs

Sohyun Joo, Taeyoon Kim, Taewon Song, Sangheon Pack

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


IEEE 802.11ax supports orthogonal frequency division multiple access (OFDMA) for uplink (UL) transmissions where stations (STAs) access randomly chosen resource units (RUs) in a distributed manner. Nevertheless, as the number of STAs increases, frequent collisions can occur, which lead to throughput degradation in UL transmissions. To address this problem, we propose a multi-user multiple-input multiple-output (MU-MIMO) enabled UL OFDMA random access (MORA) protocol. MORA combines the ideas of OFDMA and MU-MIMO, and thus more than one STA can share the same RU, which can significantly reduce the collision probability in congested situations. Analytical and simulation results demonstrate that MORA improves the throughput of the standard OFDMA-only protocol significantly.

Original languageEnglish
Pages (from-to)287-290
Number of pages4
JournalICT Express
Issue number4
Publication statusPublished - 2020 Dec

Bibliographical note

Funding Information:
This research was supported by the ITRC support program ( IITP-2019-2017-0-01633 ) supervised by the IITP.

Publisher Copyright:
© 2020 The Korean Institute of Communications and Information Sciences (KICS)


  • IEEE 802.11ax
  • MORA

ASJC Scopus subject areas

  • Software
  • Information Systems
  • Hardware and Architecture
  • Computer Networks and Communications
  • Artificial Intelligence


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