期刊
IEEE INTERNET OF THINGS JOURNAL
卷 8, 期 7, 页码 6053-6061出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JIOT.2020.3033797
关键词
Signal to noise ratio; Internet of Things; Logic gates; Protocols; Modulation; Energy consumption; Heuristic algorithms; LoRaWAN; communications and networking for Internet of Things (IoT); low-power wide-area networks; machine-to-machine communications; sensor and actuator networks
资金
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq)
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior Print [698503P]
LoRaWAN is a network protocol for supporting low-power wide-area network applications in the Internet of Things, using LoRa modulation scheme for long-range communication. The Things Network's ADR algorithm dynamically assigns transmission parameters, but may assign inadequate parameters when link quality estimate is inaccurate.
LoRaWAN is a remarkable network protocol to support the deployment of low-power wide-area network applications for the Internet of Things. Its modulation scheme, LoRa, uses different transmission parameters to allow long-range bidirectional communication by trading-off range for Time on Air (ToA). The LoRaWAN specification suggests using an adaptive data rate (ADR) algorithm to assign transmission parameters to nodes dynamically. The ADR algorithm used by The Things Network, a global open network, selects transmission parameters for communication without disconnection while lowering ToA and energy consumption. However, its often optimistic link quality estimate drives the assignment of inadequate parameters, especially in lossy channels. More precise channel quality estimates would improve resource allocation at the cost of increased complexity at the network server (NS). Through simulations, we observe that we can use the ADR link margin parameter to compensate for inaccurate link quality estimates, providing better service to nodes and maintaining low levels of energy consumption. In this work, we propose a modification to ADR that allows the selection of the link margin at runtime, increasing the network performance without the need of any prior knowledge and with no increase in the NS computational complexity.
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