On the Age-of-Information of Buffer-Aided Truncated ARQ Receiver with Chase Combining

Jorge F. Grybosi, João Luiz Rebelatto, Guilherme Luiz Moritz

DOI: 10.14209/SBRT.2020.1570655353

Evento: XXXVIII Simpósio Brasileiro de Telecomunicações e Processamento de Sinais (SBrT2020)

Keywords: Age-of-information (AoI) automatic repeat request (ARQ) chase combining internet-of-things (IoT)

Abstract

In this work, we evaluate the average age-of-information (AoI) of a network composed of an internet-of-things (IoT) end-device (ED) transmitting randomly generated status updates to an access point (AP). More specifically, we elaborate on a recently proposed truncated automatic repeat request (TARQ) scheme, by considering a buffer-aided AP that is capable of combining retransmissions by means of the maximal ratio Chase Combining (CC) technique. While the average AoI of TARQ is a decreasing function of the generation probability p, we show that the proposed TARQ-CC scheme presents a more intricate relationship between its average AoI and p, which suggests that the generation probability can be optimized to minimize the AoI. Analytical and simulation results are presented, showing that TARQ-CC is capable of achieving considerably lower AoI than TARQ, without requiring any increase in the ED complexity.

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