Hybrid NOMA Protocol with Relay Adaptive AF/DF Collaboration and Its Modeling Analysis in NB-IoT

In order to meet the demand for large-scale device access in Narrowband Internet of Things (NB-IoT) and to overcome the problem that some resources are wasted due to the use of single decode-and-forward (DF) or amplify-and-forward (AF) collaboration in traditional collaborative communication, this p...

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Bibliographic Details
Published in:Electronics (Basel) 2023-08, Vol.12 (15), p.3217
Main Authors: Li, Suoping, Gao, Ruiman, Jia, Tongtong, Yang, Hailing, Yang, Sa
Format: Article
Language:English
Subjects:
Algorithms
Collaboration
Communication
Computer network protocols
Connectivity
Cooperation
Data communications
Discrete time systems
Efficiency
Energy consumption
Internet of Things
Markov chains
Mobile communication systems
Narrowband
Nonorthogonal multiple access
Outages
Receivers & amplifiers
Relay
Wireless communication systems
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Summary:In order to meet the demand for large-scale device access in Narrowband Internet of Things (NB-IoT) and to overcome the problem that some resources are wasted due to the use of single decode-and-forward (DF) or amplify-and-forward (AF) collaboration in traditional collaborative communication, this paper introduces a non-orthogonal multiple access (NOMA) and orthogonal multiple access (OMA) hybrid access method into the NB-IoT and proposes a new Hybrid NOMA transmission protocol with relay adaptively selectable collaboration, which is represented as an algorithm. Based on this protocol, we classify the whole transmission process into five states after deriving the outage probability of each link. We then consider the system as a discrete-time Markov model, the closed expressions of the system outage probability and throughput are derived based on the system steady-state probability. In order to improve the system’s reliability, we further optimize the above protocol by allowing the source node to retransmit the unsuccessful received superimposed signals a limited number of times. Numerical results and simulations show that the outage probability is lower when multiple retransmissions are possible. The proposed relay adaptive collaborative hybrid NOMA transmission protocol has advantages over the pure OMA transmission mode.
ISSN:2079-9292
2079-9292
DOI:10.3390/electronics12153217