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Related Experiment Video

Updated: Oct 10, 2025

Large Scale Energy Efficient Sensor Network Routing Using a Quantum Processor Unit
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Cross-Cycled Uplink Resource Allocation over NB-IoT.

Ya-Ju Yu1, Yu-Hsiang Huang1, Yuan-Yao Shih2

  • 1Department of Computer Science and Information Engineering, National University of Kaohsiung, Kaohsiung 811, Taiwan.

Sensors (Basel, Switzerland)
|December 10, 2021
PubMed
Summary

To improve resource utilization in narrowband Internet of Things (NB-IoT), this study proposes a cross-cycled uplink resource allocation algorithm. This method efficiently uses otherwise wasted subframes for user equipment (UE) transmissions, especially benefiting UEs with good channel conditions.

Keywords:
NB-IoTcellular networkscross-cyclemassive connectionsuplink resource allocation

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Area of Science:

  • Telecommunications Engineering
  • Wireless Communication Systems
  • Internet of Things (IoT)

Background:

  • User equipment (UE) in narrowband Internet of Things (NB-IoT) must monitor the narrowband physical downlink control channel (NPDCCH) to receive control information before transmitting on the narrowband physical uplink shared channel (NPUSCH).
  • NB-IoT UEs operating in half-duplex mode face limitations, preventing simultaneous NPDCCH monitoring and NPUSCH transmission, leading to wasted uplink subframes.
  • Shorter NPDCCH monitoring periods exacerbate subframe wastage, particularly impacting resource efficiency.

Purpose of the Study:

  • To address the issue of wasted uplink subframes in NB-IoT systems due to half-duplex constraints.
  • To formulate a cross-cycled resource allocation problem to minimize consumed subframes while meeting UE uplink data demands.
  • To enhance overall resource utilization and support massive connectivity in NB-IoT networks.

Main Methods:

  • Formulation of the cross-cycled resource allocation problem to optimize subframe usage.
  • Development of a cross-cycled uplink resource allocation algorithm to repurpose unusable NPUSCH subframes.
  • Comparative simulation analysis against existing resource allocation algorithms.

Main Results:

  • The proposed cross-cycled resource allocation effectively reduces consumed subframes by utilizing previously unusable NPUSCH subframes.
  • Simulation results validate the effectiveness of cross-cycled radio resources in achieving massive connections over NB-IoT.
  • The algorithm demonstrates significant efficiency gains, particularly for user equipment with high channel qualities.

Conclusions:

  • The proposed cross-cycled uplink resource allocation algorithm significantly improves resource utilization in NB-IoT by efficiently managing half-duplex constraints.
  • This approach is particularly beneficial for enhancing connectivity for user equipment with superior channel conditions.
  • The algorithm's flexibility allows for adaptation to various NPDCCH periods, making it a versatile solution for NB-IoT networks.