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.
Bibliographical noteFunding Information:
Manuscript received January 4, 2019; revised April 1, 2019 and June 11, 2019; accepted June 12, 2019. Date of publication June 17, 2019; date of current version August 13, 2019. This work was supported in part by DST under Grant RP03514G, in part by the NRF Grant funded by the Korea government (MSIT) under Grant NRF-2018R1C1B6008126, and in part by National Research Foundation (NRF) of Korea Grant funded by the Korean Government (MSIP) under Grant 2017R1E1A1A01073742. The review of this paper was coordinated by Prof. H.-F. Lu. (Corresponding author: Hu Jin.) J.-B. Seo is with the Department of Electrical Engineering, Indian Institute of Technology Delhi, Hauz Khas 110016, India (e-mail: firstname.lastname@example.org).
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- Non-orthogonal multiple access
- Unmanned aerial vehicle
ASJC Scopus subject areas
- Automotive Engineering
- Aerospace Engineering
- Electrical and Electronic Engineering
- Applied Mathematics