Phase-Divided MAC Protocol for Integrated Uplink and Downlink Multi-User MIMO WLANs

Tae Yoon Kim, Taewon Song, Wonjung Kim, Sangheon Pack

Research output: Contribution to journalArticle

2 Citations (Scopus)


Multi-user multiple-input and multiple-output (MU-MIMO) technology is regarded as one of the most promising technologies to cope with the enormous amount of network traffic in wireless local area networks (WLANs). However, combining uplink and downlink MU-MIMO in the basis of a distributed coordination function (DCF) causes serious channel resource loss because of collisions between uplink and downlink transmissions. In this paper, we propose a phase-divided medium access control (PD-MAC) protocol, in which a novel integrated frame structure is introduced that allocates two phases for uplink and downlink in a periodic cycle to remove contentions between uplink and downlink transmissions. PD-MAC also adopts an overhead mitigation scheme to reduce control overhead in user-selection and employs an algorithm to balance uplink and downlink throughputs. An analytical model is developed to characterize the PD-MAC network throughput. Simulation results show that PD-MAC outperforms the previous unified MAC with regard to network throughput by 21.2%, and that the overhead mitigation scheme improves PD-MAC network throughput by 47.3%.

Original languageEnglish
JournalIEEE Transactions on Vehicular Technology
Publication statusAccepted/In press - 2017 Nov 24


  • Analytical models
  • Data communication
  • Downlink
  • IEEE 802.11ac/ax
  • Integrated frame structure
  • Media Access Protocol
  • MIMO
  • Overhead mitigation scheme
  • PD-MAC
  • Throughput
  • Uplink

ASJC Scopus subject areas

  • Automotive Engineering
  • Aerospace Engineering
  • Applied Mathematics
  • Electrical and Electronic Engineering

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