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This study investigates the possibility to implement direct-to-device 5G services within the n254 band, designated by 3GPP as the NTN band for satellite connectivity in Release 18. The challenge arises due to the overlapping uplink channel of the n254 band with the Iridium satellite system’s frequency band, which operates in TDD mode within the 1610–1626.5 MHz range. The study examines the interference levels from future 5G NTN user equipment to the Iridium uplink channel. The results form the basis for drawing conclusions regarding the potential ramifications if the NTN system were to be deployed in the n254 band. Specifically, the study evaluates the potential increase in noise levels on the Iridium uplink channel due to interference from NTN user equipment. The findings offer valuable insights into the feasibility and potential challenges associated with deploying the NTN system in the specified frequency band.

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Analysis of Co-channel Interference Between Future Direct-to-Device NTN Systems and Iridium System in L-Band

  • 会议论文

  • 发表日期：

    2026年

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  • Alexander Pastukh,
  • Valery Tikhvinskiy,
  • Evgeny Devyatkin,
  • Olga Mironova

摘要

This study investigates the possibility to implement direct-to-device 5G services within the n254 band, designated by 3GPP as the NTN band for satellite connectivity in Release 18. The challenge arises due to the overlapping uplink channel of the n254 band with the Iridium satellite system’s frequency band, which operates in TDD mode within the 1610–1626.5 MHz range. The study examines the interference levels from future 5G NTN user equipment to the Iridium uplink channel. The results form the basis for drawing conclusions regarding the potential ramifications if the NTN system were to be deployed in the n254 band. Specifically, the study evaluates the potential increase in noise levels on the Iridium uplink channel due to interference from NTN user equipment. The findings offer valuable insights into the feasibility and potential challenges associated with deploying the NTN system in the specified frequency band.