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Evolution of the 5G New Radio Two-Step Random Access towards 6G Unsourced MAC

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arxiv 2405.03348 v1 pith:OCJTBJEH submitted 2024-05-06 cs.IT math.IT

Patrick Agostini , Jean-Francois Chamberland , Federico Clazzer , Johannes Dommel , Gianluigi Liva , Andrea Munari , Krishna Narayanan , Yury Polyanskiy
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Slawomir Stanczak Zoran Utkovski
This is my paper · ORCID
classification cs.ITmath.IT
keywords accessprotocolrandomanalysisexistinggainsgrant-freelarge
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This report summarizes some considerations on possible evolutions of grant-free random access in the next generation of the 3GPP wireless cellular standard. The analysis is carried out by mapping the problem to the recently-introduced unsourced multiple access channel (UMAC) setup. By doing so, the performance of existing solutions can be benchmarked with information-theoretic bounds, assessing the potential gains that can be achieved over legacy 3GPP schemes. The study focuses on the two-step random access (2SRA) protocol introduced by Release 16 of the 5G New Radio standard, investigating its applicability to support large MTC / IoT terminal populations in a grant-free fashion. The analysis shows that the existing 2SRA scheme may not succeed in providing energy-efficient support to large user populations. Modifications to the protocol are proposed that enable remarkable gains in both energy and spectral efficiency while retaining a strong resemblance to the legacy protocol.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Delay-Doppler Signal Processing with Zadoff-Chu Sequences

    eess.SP 2024-12 conditional novelty 6.0 of 10

    Derives closed-form delay-Doppler properties of Zadoff-Chu pilots and uses them with one-step thresholding to detect multiple preambles in doubly dispersive channels.

  2. Density Evolution Analysis of Sparse-Block IDMA

    cs.IT 2025-07 conditional novelty 5.0 of 10

    A density evolution recursion characterizes the TIN-SIC receiver of SB-IDMA and predicts a phase transition between high-error and low-error operating regimes.

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