A comprehensive analysis of non-terrestrial networks impact on 5G NR random access

Ali Z. K. Matloob (), Muammer Aksoy (), Ali Kadhum M. Al-Qurabat () and Nabaa A. AL Lawndi ()
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Ali Z. K. Matloob: University of Babylon
Muammer Aksoy: Al-Mustaqbal University
Ali Kadhum M. Al-Qurabat: Al-Mustaqbal University
Nabaa A. AL Lawndi: Al-Furat Al-Awsat Technical University

Telecommunication Systems: Modelling, Analysis, Design and Management, 2025, vol. 88, issue 2, No 19, 17 pages

Abstract: Abstract This paper critically analyzes the influence of non-terrestrial networks (NTN) on the NR random access mechanism for 5G New Radio (NR). The use of NTN in 5G enables widespread connection but presents technological issues like heightened propagation delays, differential delays, and Doppler shifts. This work investigates the effect of NTN on Physical Random Access Channels (PRACH) preamble configurations, random access response window lengths, and uplink timing advance techniques. We present a novel method that maximizes these values to improve the NR random access efficiency in NTN environments. One thing that needs to be thought about is switching from stationary to adaptive timing advance models, as well as Doppler-resilient PRACH preamble designs and adaptive response window approaches. These improvements lower latency and increase synchronizing accuracy; hence, they enhance NTN-supported 5G NR implementations. The results of the research are vital for increasing the dependability and user experience of next-generation wireless communication systems coupled with NTN.

Keywords: Non-terrestrial network; Random access; 5G NR; Propagation delay (search for similar items in EconPapers)
Date: 2025
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DOI: 10.1007/s11235-025-01294-y

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