Band Assignment in Ultra-Narrowband (UNB) Systems for Massive IoT Access

Enes Krijestorac, Ghaith Hattab, Petar Popovski, Danijela Cabric

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review


In this work, we consider a novel type of Internet of Things (IoT) ultra-narrowband (UNB) network architecture that involves multiple multiplexing bands or channels for uplink transmission. An IoT device can randomly choose any of the multiplexing bands and transmit its packet. Due to hardware constraints, a base station (BS) is able to listen to only one multiplexing band. The hardware constraint is mainly due to the complexity of performing fast Fourier transform (FFT) at a very small sampling interval over the multiplexing bands in order to counter the uncertainty of IoT device frequency and synchronize onto transmissions. The objective is to find an assignment of BSs to multiplexing bands in order to maximize the packet decoding probability (PDP). We develop a learning-based algorithm based on a sub-optimal solution to PDP maximization. The simulation results show that our approach to band assignment achieves near-optimal performance in terms of PDP, while at the same time, significantly exceeding the performance of random assignment. We also develop a heuristic algorithm with no learning overhead based on the locations of the BSs that also outperforms random assignment and serves as a performance reference to our learning-based algorithm.

Original languageEnglish
Title of host publicationGLOBECOM 2020 - 2020 IEEE Global Communications Conference
Number of pages6
Publication date25 Jan 2021
Article number9322262
ISBN (Print)978-1-7281-8299-5
ISBN (Electronic)978-1-7281-8298-8
Publication statusPublished - 25 Jan 2021
EventGLOBECOM 2020 - 2020 IEEE Global Communications Conference - Taipei, Taiwan, Province of China
Duration: 7 Dec 202011 Dec 2020


ConferenceGLOBECOM 2020 - 2020 IEEE Global Communications Conference
CountryTaiwan, Province of China


  • IoT
  • LPWA networks
  • UNB
  • channel assignment

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