Title: An adaptive data rate algorithm for improving energy efficiency for multi-gateway LoRaWANs

Authors: Lin-Heng Chang; Yi Chang; Chih-Kae Guan; Tong-Ying Juang; Wen-Chang Fang

Addresses: Department of Business Administration, National Taipei University, New Taipei 237, Taiwan ' Department of Computer Science and Information Engineering, National Taipei University, New Taipei 237, Taiwan ' Department of Business Administration, National Taipei University, New Taipei 237, Taiwan ' Department of Computer Science and Information Engineering, National Taipei University, New Taipei 237, Taiwan ' Department of Business Administration, National Taipei University, New Taipei 237, Taiwan

Abstract: The need of the low power, long range, and low cost connectivity for satisfying the requirement of internet of things (IoT) applications for smart city is leading the emergence of low power wide area (LPWA) networking technologies. The resource efficiency plays an important role in realistic application, LoRaWAN allows the static end devices to individually adapt and optimise the data rates and the transmission power, which is referred to as adaptive data rate (ADR) problem. In this paper, we develop a new ADR algorithm for multi-gateway LoRaWAN environment to quickly choose the appropriate LoRa transmission parameter for independent LoRa end device based on LoRaWAN specification. To successfully execute the ADR algorithm, we especially rewrite the firmware of Semtech's SX1276 transceivers to implement our proposed ADR algorithm over multi-gateway LoRaWAN system, including end device, multi-gateways and network server. Our ADR algorithm utilises the radio link quality, including RSSI, SNR, and packet reception ratio (PRR), from multi-gateways, and the network server determines the appropriate LoRa transmission parameter. Finally, the experimental results illustrate that the proposed algorithm improves the energy efficiency, the effective bit rate, and the battery life of the end device.

Keywords: low power wide area; LPWA; LoRaWAN; adaptive data rate; ADR; radio link quality; multi-gateways.

DOI: 10.1504/IJAHUC.2020.106653

International Journal of Ad Hoc and Ubiquitous Computing, 2020 Vol.33 No.4, pp.197 - 215

Received: 26 Jan 2019
Accepted: 16 Apr 2019
Published online: 16 Apr 2020 *

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