Persistent Periodic Uplink Scheduling Algorithm for Massive NB-IoT Devices

Tin Yu Wu, Ren Hung Hwang*, Abhishek Vyas, Chia Yiu Lin, Chi Ruei Huang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


Narrowband Internet of Things (NB-IoT) is one of the low-power wide-area network (LPWAN) technologies that aim to support enormous connections, featuring wide-area coverage, low power consumption, and low costs. NB-IoT could serve a massive number of IoT devices, but with very limited radio resources. Therefore, how to enable a massive number of IoT devices to transmit messages periodically, and with low latency, according to transmission requirements, has become the most crucial issue of NB-IoT. Moreover, IoT devices are designed to minimize power consumption so that the device battery can last for a long time. Similarly, the NB-IoT system must configure different power-saving mechanisms for different types of devices to prolong their battery lives. In this study, we propose a persistent periodic uplink scheduling algorithm (PPUSA) to assist a plethora of Internet of Things (IoT) devices in reporting their sensing data based on their sensing characteristics. PPUSA explicitly considers the power-saving mode and connection suspend/resume procedures to reduce the IoT device’s power consumption and processing overhead. PPUSA allocates uplink resource units to IoT devices systematically so that it can support the periodic–uplink transmission of a plethora of IoT devices while maintaining low transmission latency for bursty data. The simulation results show that PPUSA can support up to 600,000 IoT devices when the NB-IoT uplink utilization is 80%. In addition, it takes only one millisecond for the transmission of the bursty messages.

Original languageEnglish
Article number2875
Issue number8
StatePublished - 1 Apr 2022


  • 5G
  • massive IoT devices
  • NB-IoT
  • power saving mechanism
  • resource units
  • uplink scheduling


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