HARQ-Based Grant-Free NOMA for mMTC Uplink

Jabbarvaziri, Faramarz; Balasubramanya, Naveen Mysore; Lampe, Lutz

doi:10.1109/jiot.2020.3045447

Cited by 10 publications

(1 citation statement)

References 31 publications

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“…HARQ-enabled NOMA is also studied in [ 22 , 23 ] to evaluate its usefulness in enabling URLLC and mMTC. In [ 34 ], the authors analyzed HARQ in an uplink NOMA setting, focusing on enabling retransmissions to be distinguishable from the regular transmission to facilitate grant-free HARQ communication. Moreover, in [ 35 ], the authors adjust power levels among users to reduce retransmission requests.…”

Section: Introductionmentioning

confidence: 99%

Delay-Sensitive NOMA-HARQ for Short Packet Communications

Nadeem

Shirvanimoghaddam

et al. 2021

Entropy

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This paper investigates the two-user uplink non-orthogonal multiple access (NOMA) paired with the hybrid automatic repeat request (HARQ) in the finite blocklength regime, where the target latency of each user is the priority. To limit the packet delivery delay and avoid packet queuing of the users, we propose a novel NOMA-HARQ approach where the retransmission of each packet is served non-orthogonally with the new packet in the same time slot. We use a Markov model (MM) to analyze the dynamics of the uplink NOMA-HARQ with one retransmission and characterize the packet error rate (PER), throughput, and latency performance of each user. We also present numerical optimizations to find the optimal power ratios of each user. Numerical results show that the proposed scheme significantly outperforms the standard NOMA-HARQ in terms of packet delivery delay at the target PER.

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