Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Improving Link Reliability of IEEE 802.15.4g SUN with Re-Transmission Shaping

Version 1 : Received: 21 October 2020 / Approved: 22 October 2020 / Online: 22 October 2020 (12:04:23 CEST)

How to cite: Solimini, D.; Tuset-Peiró, P.; Boquet, G.; Vilajosana, X.; Vázquez-Gallego, F. Improving Link Reliability of IEEE 802.15.4g SUN with Re-Transmission Shaping. Preprints 2020, 2020100461 (doi: 10.20944/preprints202010.0461.v1). Solimini, D.; Tuset-Peiró, P.; Boquet, G.; Vilajosana, X.; Vázquez-Gallego, F. Improving Link Reliability of IEEE 802.15.4g SUN with Re-Transmission Shaping. Preprints 2020, 2020100461 (doi: 10.20944/preprints202010.0461.v1).

Abstract

Packet re-transmissions are a common technique to improve link reliability in low-power wireless networks. However, since packet re-transmissions increase the end-device energy consumption and the network load, a maximum number of re-transmissions per packet is typically set, also considering the duty-cycle limitations imposed by radio-frequency regulations. Moreover, the number of re-transmissions per packet is typically set to a constant value, meaning that all packet re-transmissions are treated the same regardless of actual channel conditions (i.e., multi-path propagation or internal/external interference effects). Taking that into account, in this paper we propose and evaluate the concept of re-transmission shaping, a mechanism that manages packet re-transmissions to maximize link reliability, while minimizing energy consumption and meeting radio-frequency regulation constraints. The proposed re-transmission shaping mechanism operates by keeping track of unused packet re-transmissions and allocating additional retransmission when the instantaneous link quality decreases due to channel impairments. To evaluate the re-transmission shaping mechanism we use trace-based simulations using a IEEE 802.15.4g SUN data-set and two widely used metrics, the PDR (Packet Delivery Ratio) and the RNP (Required Number of Packets). The obtained results show that re-transmission shaping is a useful mechanism to improve link reliability of low-power wireless communications, as it can increase PDR from 77.9% to 99.2% while sustaining a RNP of 2.35 re-transmissions per packet, when compared to using a single re-transmission per packet.

Subject Areas

Internet of Things; IEEE 802.15.4g; Smart Utility Networks; Retransmission Shaping

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