Mobile LoRa Device 의 네트워크 연결성 개선을 위한 FCR-ADR 알고리즘

Abstract

Long Range Wide Area Network (LoRaWAN), a communication technology for the Internet of Things (IoT), consumes low energy and enables long-range communication. LoRaWAN supports Adaptive Data Rate (ADR), which can conserve energy by optimizing the data rate and Time on Air (ToA). ADR is executed on an end device and on the network server side. While ADR on the end device side is an algorithm to recover the connection when it is lost, ADR on the network server side aims to set appropriate transmission parameters with the recently uplinked signal-to-noise ratio (SNR) value and to deliver the parameter change command to the end device. However, the existing ADR on the end device side requires a considerable amount of time to restore the connection when the network condition deteriorates, leading to the loss of many packets. This study presents Fast Connection Recovery ADR (FCR-ADR), a novel, end device side ADR algorithm that reduces the number of packets lost while an end device moves. The evaluation results of simulation study using the OMNeT++ simulator and FLoRa (Framework for LoRa) show that the proposed FCR-ADR algorithm surpasses the existing ADR in terms of packet delivery ratio (PDR) with no significant difference in energy consumption.