Cooperative NOMA-Based User Pairing for URLLC: A Max-Min Fairness Approach

Fateme Salehi; mohammad-hassan Majidi; Nasser Neda; Hamed Ahmadi

doi:10.1109/JSYST.2021.3116112

Cooperative NOMA-Based User Pairing for URLLC: A Max-Min Fairness Approach

Fateme Salehi, mohammad-hassan Majidi, Nasser Neda, Hamed Ahmadi

Electronic Engineering

Research output: Contribution to journal › Article › peer-review

Abstract

In this paper, cooperative non-orthogonal multiple
access (C-NOMA) is considered in short packet communications
with finite blocklength (FBL) codes. The performance of a
decode-and-forward (DF) relaying along with selection combining
(SC) and maximum ratio combining (MRC) strategies at the
receiver side is examined. We explore joint user pairing and
resource allocation to maximize fair throughput in a downlink
(DL) scenario. In each pair, the user with a stronger channel
(strong user) acts as a relay for the other one (weak user), and
optimal power and blocklength are allocated to achieve max-min
throughput. To this end, first, only one pair is considered, and
optimal resource allocation is explored. Also, a suboptimal algorithm is suggested, which converges to a near-optimal solution.
Finally, the problem is extended to a general scenario, and a
suboptimal C-NOMA-based user pairing is proposed. Numerical
results show that the proposed C-NOMA scheme in both SC and
MRC strategies significantly improves the users’ fair throughput
compared to the NOMA and OMA. It is also investigated that
the proposed pairing scheme based on C-NOMA outperforms
the Hybrid NOMA/OMA scheme from the average throughput
perspective, while the fairness index degrades slightly

Original language	English
Pages (from-to)	3833-3843
Number of pages	11
Journal	IEEE Systems
Volume	16
Issue number	3
Early online date	13 Oct 2021
DOIs	https://doi.org/10.1109/JSYST.2021.3116112
Publication status	Published - 1 Sept 2022

Bibliographical note

© 2021 IEEE. This is an author-produced version of the published paper. Uploaded in accordance with the publisher’s self-archiving policy. Further copying may not be permitted; contact the publisher for details

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10.1109/JSYST.2021.3116112

Cooperative NOMA-Based User Pairing for URLLC: A Max-Min Fairness Approach
© 2021 IEEE. This is an author-produced version of the published paper. Uploaded in accordance with the publisher’s self-archiving policy. Further copying may not be permitted; contact the publisher for details
Accepted author manuscript, 680 KB

https://arxiv.org/pdf/2101.07641.pdf

Cite this

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title = "Cooperative NOMA-Based User Pairing for URLLC: A Max-Min Fairness Approach",

abstract = "In this paper, cooperative non-orthogonal multipleaccess (C-NOMA) is considered in short packet communicationswith finite blocklength (FBL) codes. The performance of adecode-and-forward (DF) relaying along with selection combining(SC) and maximum ratio combining (MRC) strategies at thereceiver side is examined. We explore joint user pairing andresource allocation to maximize fair throughput in a downlink(DL) scenario. In each pair, the user with a stronger channel(strong user) acts as a relay for the other one (weak user), andoptimal power and blocklength are allocated to achieve max-minthroughput. To this end, first, only one pair is considered, andoptimal resource allocation is explored. Also, a suboptimal algorithm is suggested, which converges to a near-optimal solution.Finally, the problem is extended to a general scenario, and asuboptimal C-NOMA-based user pairing is proposed. Numericalresults show that the proposed C-NOMA scheme in both SC andMRC strategies significantly improves the users{\textquoteright} fair throughputcompared to the NOMA and OMA. It is also investigated thatthe proposed pairing scheme based on C-NOMA outperformsthe Hybrid NOMA/OMA scheme from the average throughputperspective, while the fairness index degrades slightly",

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AU - Neda, Nasser

AU - Ahmadi, Hamed

N1 - © 2021 IEEE. This is an author-produced version of the published paper. Uploaded in accordance with the publisher’s self-archiving policy. Further copying may not be permitted; contact the publisher for details

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N2 - In this paper, cooperative non-orthogonal multipleaccess (C-NOMA) is considered in short packet communicationswith finite blocklength (FBL) codes. The performance of adecode-and-forward (DF) relaying along with selection combining(SC) and maximum ratio combining (MRC) strategies at thereceiver side is examined. We explore joint user pairing andresource allocation to maximize fair throughput in a downlink(DL) scenario. In each pair, the user with a stronger channel(strong user) acts as a relay for the other one (weak user), andoptimal power and blocklength are allocated to achieve max-minthroughput. To this end, first, only one pair is considered, andoptimal resource allocation is explored. Also, a suboptimal algorithm is suggested, which converges to a near-optimal solution.Finally, the problem is extended to a general scenario, and asuboptimal C-NOMA-based user pairing is proposed. Numericalresults show that the proposed C-NOMA scheme in both SC andMRC strategies significantly improves the users’ fair throughputcompared to the NOMA and OMA. It is also investigated thatthe proposed pairing scheme based on C-NOMA outperformsthe Hybrid NOMA/OMA scheme from the average throughputperspective, while the fairness index degrades slightly

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