Slotted ALOHA on LoRaWAN-Design, Analysis, and Deployment

Sensors

Achille Marzocchi¹  Luca Benini¹  Tommaso Polonelli¹  Davide Brunelli² 

[1] DEI, University of Bologna, 40123 Bologna, Italy;DII, University of Trento, I-38123 Trento, Italy;

关键词: Internet of Things;    wireless sensor networks;    long range radio;    LoRa;    LoRaWAN;    ALOHA;    Slotted ALOHA;    synchronization;    low-energy wireless protocols;   

DOI  :  10.3390/s19040838

来源: DOAJ

【 摘 要 】

LoRaWAN is one of the most promising standards for long-range sensing applications. However, the high number of end devices expected in at-scale deployment, combined with the absence of an effective synchronization scheme, challenge the scalability of this standard. In this paper, we present an approach to increase network throughput through a Slotted-ALOHA overlay on LoRaWAN networks. To increase the single channel capacity, we propose to regulate the communication of LoRaWAN networks using a Slotted-ALOHA variant on the top of the Pure-ALOHA approach used by the standard; thus, no modification in pre-existing libraries is necessary. Our method is based on an innovative synchronization service that is suitable for low-cost wireless sensor nodes. We modelled the LoRaWAN channel with extensive measurement on hardware platforms, and we quantified the impact of tuning parameters on physical and medium access control layers, as well as the packet collision rate. Results show that Slotted-ALOHA supported by our synchronization service significantly improves the performance of traditional LoRaWAN networks regarding packet loss rate and network throughput.

【 授权许可】

Unknown