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Title	An Adaptive Data Rate Scheme For Multi-Hop Forwarding In Lorawan Networks
ID_Doc	7365
Authors	Louati R.; Thaalbi M.; Tabbane N.
Year	2024
Published	20th International Wireless Communications and Mobile Computing Conference, IWCMC 2024
DOI	http://dx.doi.org/10.1109/IWCMC61514.2024.10592512
Abstract	LoRaWAN (Long Range Wide Area Network) is experiencing widespread adoption in smart cities and industrial sites owing to its peculiar features, including easy deployment and low power consumption. However, the single-hop architecture of LoRaWAN presents scalability limitations in situations requiring multi-hop forwarding, such as during infrastructure breakdown, notably given the interoperability issues with other communication standards. Multiple studies have suggested dual-hop or multi-hop solutions to address this limitation, nevertheless, certain technical specifications that LoRaWAN relies on, such as adaptive data rate (ADR), still present challenges. The ADR mechanism dynamically optimizes data rate and transmission power. These parameters are controlled by complying with the network server (NS) based on signal-to-noise ratio (SNR), or by the device through the adaptive data rate (ADR) scheme. In a multi-hop scenario, the NS is unable to assess the signal quality to determine the best transmission parameters for the device. Moreover, the ADR scheme does not incorporate any alternative multi-path forwarding strategies. In this paper, we introduce a multi-hop adaptive data rate (MH-ADR) mechanism that relies solely on the device's strategy to optimize transmission parameters. This mechanism leverages alternative multi-path routes to ensure the highest achievable data rate. Simulation results demonstrate that in a multi-hop scenario, the proposed mechanism preserves higher data rates for most of the simulation time compared to basic ADR. © 2024 IEEE.
Author Keywords	Adaptive Data Rate; IoT; LoRaWAN; LPWAN; Multi-hop forwarding

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