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arXiv · 2104.10576

How to Identify and Authenticate Users in Massive Unsourced Random Access

Radosław Kotaba·Anders E. Kalør·Petar Popovski·Israel Leyva-Mayorga·Beatriz Soret·Maxime Guillaud·Luis G. Ordóñez
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Abstract

Identification and authentication are two basic functionalities of traditional random access protocols. In ALOHA-based random access, the packets usually include a field with a unique user address. However, when the number of users is massive and relatively small packets are transmitted, the overhead of including such field becomes restrictive. In unsourced random access (U-RA), the packets do not include any address field for the user, which maximizes the number of useful bits that are transmitted. However, by definition an U-RA protocol does not provide user identification. This paper presents a scheme that builds upon an underlying U-RA protocol and solves the problem of user identification and authentication. In our scheme, the users generate a message authentication code (MAC) that provides these functionalities without violating the main principle of unsourced random access: the selection of codewords from a common codebook is i.i.d. among all users.

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Radosław Kotaba, Anders E. Kalør, Petar Popovski, Israel Leyva-Mayorga, Beatriz Soret, Maxime Guillaud, Luis G. Ordóñez. 2021-10-11. How to Identify and Authenticate Users in Massive Unsourced Random Access. https://arxiv.org/abs/2104.10576

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