Uplink NOMA random access for UAV-assisted communications

Jun Bae Seo, Sangheon Pack, Hu Jin

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)


This correspondence paper investigates uplink non-orthogonal multiple access (NOMA) for unmanned aerial vehicle base stations (UAV-BSs). Users under the service area of a UAV-BS perform NOMA random access (RA) by controlling their transmit power so that the UAV-BS can receive one of two predefined power levels. This facilitates successive interference cancellation (SIC) at the UAV-BS. This correspondence paper shows the maximum stable throughput of uplink NOMA RA in terms of the altitude and beamwidth of the UAV-BS. Further, we propose a stabilizing algorithm, with which a UAV-BS broadcasts the throughput-maximal retransmission probability every slot, while users access the channel based on the retransmission probability. Extensive simulations show that the proposed algorithm can achieve the maximum throughput 0.5869 (packets/slot) and stabilize the system with time-varying traffic.

Original languageEnglish
Article number2923441
Pages (from-to)8289-8293
Number of pages5
JournalIEEE Transactions on Vehicular Technology
Issue number8
Publication statusPublished - 2019 Aug


  • Non-orthogonal multiple access
  • Stability
  • Unmanned aerial vehicle

ASJC Scopus subject areas

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


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