Resource Allocation for NOMA-based LPWA Networks Powered by Energy Harvesting

Fatma Benkhelifa, Julie McCann

Research output: Chapter in Book/Report/Conference proceedingConference proceedingpeer-review

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Abstract

In this paper, we consider the uplink transmissions of non-orthogonal multiple access (NOMA)-based low-power wide-area (LPWA) networks consisting of multiple self-powered nodes and a NOMA-based single gateway. The self-powered LPWA nodes use the”harvest-then-transmit” protocol where they harvest energy from ambient sources (solar and radio frequency signals), then transmit their signals. The main features of the studied LPWA network are different transmission times-on-air, multiple uplink transmission attempts, and duty cycle restrictions. The aim of this work is to maximize the time-averaged sum of the uplink transmission rates by optimizing the transmission time-on-air allocation, the energy harvesting time allocation and the power allocation; subject to a maximum transmit power and to the availability of the harvested energy. We propose a low complex solution which decouples the optimization problem into three sub-problems: we assign the transmission times either fairly or unfairly between LPWA nodes, we optimize the EH times using a one-dimensional search method, and optimize the transmit powers using concave-convex procedure (CCCP) procedure. In the simulation results, we focus on Long Range (LoRa) networks as a practical example LPWA network. We validate our proposed solution and we observe a 15% performance improvement when using NOMA.

Original languageEnglish
Title of host publication2021 IEEE Wireless Communications and Networking Conference, WCNC 2021
PublisherIEEE
Number of pages6
ISBN (Electronic)9781728195056
ISBN (Print)9781728195063
DOIs
Publication statusPublished - 5 May 2021
Externally publishedYes
Event2021 IEEE Wireless Communications and Networking Conference - Nanjing, China
Duration: 29 Mar 20221 Apr 2022

Conference

Conference2021 IEEE Wireless Communications and Networking Conference
Abbreviated titleWCNC
Country/TerritoryChina
CityNanjing
Period29/03/221/04/22

Bibliographical note

© 2021 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.

Keywords

  • Duty cycle
  • Energy harvesting
  • LPWANs
  • Non-orthogonal multiple access
  • Time-averaged sum-rate maximization

ASJC Scopus subject areas

  • Engineering(all)

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