Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Cooperative NOMA-Based User Pairing for URLLC: A Max-Min Fairness
  Approach   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.

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The categories of this paper are: q-fin
31
The categories of this paper are: ao-sci
27
The categories of this paper are: comp-gas
36
The categories of this paper are: cmp-lg
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The categories of this paper are: adap-org
26
The categories of this paper are: bayes-an
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The categories of this paper are: atom-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: dg-ga
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The categories of this paper are: hep-lat
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The categories of this paper are: nucl-ex
0
The categories of this paper are: hep-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: q-bio
3
The categories of this paper are: physics
35
The categories of this paper are: mtrl-th