Considering an ultra-reliable low latency communication scenario, we assess the trade-off in terms of energy consumption between achieving time diversity through retransmissions and having to communicate at a higher rate due to latency constraints. Our analysis considers Nakagami-m block-fading channels with Chase combining hybrid automatic repeat request. We derive a fixed-point equation to determine the best number of allowed transmission attempts considering the maximum possible energy spent, which yields insights into the system behavior. Furthermore, we compare the energy consumption of the proposed approach against direct transmission with frequency diversity. Results show substantial energy savings using retransmissions when selecting the maximum number of transmission attempts according to our approach. For instance, considering a Rayleigh channel and smart grid teleprotection applications, our approach uses around 8 times less energy per bit compared with a direct transmission with frequency diversity.
Nadas João Pedro Battistella, Onireti Oluwakayode, Souza Richard Demo, Alves Hirley, Brante Glauber, Imran Muhammad Ali
A1 Journal article – refereed
Place of publication:
J. P. Battistella Nadas, O. Onireti, R. D. Souza, H. Alves, G. Brante and M. A. Imran, Performance Analysis of Hybrid ARQ for Ultra-Reliable Low Latency Communications,” in IEEE Sensors Journal, vol. 19, no. 9, pp. 3521-3531, 1 May1, 2019. doi: 10.1109/JSEN.2019.2891221
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