Iterative Collision Resolution for Slotted ALOHA With NOMA for Heterogeneous Devices

In this paper, the problem of using uncoordinated multiple access (UMA) to serve a massive amount of heterogeneous users is investigated. Leveraging the heterogeneity, we propose a novel UMA protocol, called iterative collision resolution for slotted ALOHA (IRSA) with non-orthogonal multiple access...

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Bibliographic Details
Published in:IEEE transactions on communications 2021-05, Vol.69 (5), p.2948-2961
Main Authors: Huang, Yu-Chih, Shieh, Shin-Lin, Hsu, Yu-Pin, Cheng, Hao-Ping
Format: Article
Language:English
Subjects:
Bipartite graph
Decoding
Density
density evolution
diversity slotted ALOHA
Evolution
Heterogeneity
Interference cancellation
NOMA
non-orthogonal multiple access
Nonorthogonal multiple access
Optimization
Protocols
Silicon carbide
Slotted ALOHA
successive interference cancellation
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Summary:In this paper, the problem of using uncoordinated multiple access (UMA) to serve a massive amount of heterogeneous users is investigated. Leveraging the heterogeneity, we propose a novel UMA protocol, called iterative collision resolution for slotted ALOHA (IRSA) with non-orthogonal multiple access (NOMA), to improve the conventional IRSA. In addition to the inter-slot successive interference cancellation (SIC) technique used in existing IRSA-based schemes, the proposed protocol further employs the intra-slot SIC technique that enables collision resolution for certain configurations of collided packets. A novel multi-dimensional density evolution is then proposed to analyze and to optimize the proposed protocol. Simulation results show that the proposed IRSA with NOMA protocol can efficiently exploit the heterogeneity among users and the multi-dimensional density evolution can accurately predict the throughput performance. Last, an extension of the proposed IRSA with NOMA protocol to the frame-asynchronous setting is investigated, where a boundary effect similar to that in spatially-coupled low-density parity check codes can be observed to bootstrap the decoding process.
ISSN:0090-6778
1558-0857
DOI:10.1109/TCOMM.2021.3059778