Abstract
LoRa is an emerging communication technology that can be used in any field. Many types of research have analyzed LoRa network using a gateway and several end devices to many monitoring applications. However, the communication performance between LoRa end devices only has not been evaluated. This research tested a LoRa communication between two end devices in a point-to-point topology. From the experiment results with various payload lengths, the optimum payload is only 48 bytes with the default module configuration. Longer payload resulted in a decreased performance. Thus, this research implemented a waiting protocol that can increase the Packet Reception Ratio of 100-byte payload from 49.87% to 97.52%.
Highlights
LoRa is a new long-range communication technology in the field of the Internet of Things (IoT), among Radio Frequency Identification (RFID) [1] and WIFi [2,3]
The communication performance was analyzed especially by its Packet Reception Ratio (PRR), which is calculated from the ratio of the number of received packets and the number of sent packets
This paper demonstrates that a simple waiting protocol could increase the PRR value for long packets, while other researches only provide communication performance for 20-byte and 40-byte packets [13]
Summary
LoRa is a new long-range communication technology in the field of the Internet of Things (IoT), among Radio Frequency Identification (RFID) [1] and WIFi [2,3]. LoRa allows users to transmit data to a long-distance node with the compensation of a low data rate. Its specification describes that LoRa can transmit data with a maximum data rate of 37.5 kbps [4]. The configuration of LoRa’s parameters such as spreading factor (SF), bandwidth (BW) and Code Rate (CR) determines the data rate (Rb) and coverage range. A higher spreading factor yields a longer range and slower data rate [5]. The relation between these parameters and the data rate is shown in (1)
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