@misc{10481/67701,
year = {2021},
month = {2},
url = {http://hdl.handle.net/10481/67701},
abstract = {The number of connected IoT devices is significantly increasing and it is expected to reach
more than two dozens of billions of IoT connections in the coming years. Low Power Wide Area
Networks (LPWAN) have become very relevant for this new paradigm due to features such as
large coverage and low power consumption. One of the most appealing technologies among these
networks is LoRaWAN. Although it may be considered as one of the most mature LPWAN platforms,
there are still open gaps such as its capacity limitations. For this reason, this work proposes a
collision avoidance resource allocation algorithm named the Collision Avoidance Resource Allocation
(CARA) algorithm with the objective of significantly increase system capacity. CARA leverages the
multichannel structure and the orthogonality of spreading factors in LoRaWAN networks to avoid
collisions among devices. Simulation results show that, assuming ideal radio link conditions, our
proposal outperforms in 95.2% the capacity of a standard LoRaWAN network and increases the
capacity by almost 40% assuming a realistic propagation model. In addition, it has been verified
that CARA devices can coexist with LoRaWAN traditional devices, thus allowing the simultaneous
transmissions of both types of devices. Moreover, a proof-of-concept has been implemented using
commercial equipment in order to check the feasibility and the correct operation of our solution.},
organization = {Andalusian Knowledge Agency 
	
A-TIC-241-UGR18},
organization = {Spanish Ministry of Economy and Competitiveness 
	
TEC2016-76795-C6-4-R},
organization = {H2020 research and innovation project 5G-CLARITY 
	
871428},
publisher = {MDPI},
keywords = {LoRa MAC},
keywords = {LoRaWAN},
keywords = {Capacity},
keywords = {Packet error rate},
keywords = {Throughput},
keywords = {Path loss},
title = {Collision Avoidance Resource Allocation for LoRaWAN},
doi = {10.3390/s21041218},
author = {Chinchilla Romero, Natalia and Navarro Ortiz, Jorge and Muñoz Luengo, Pablo and Ameigeiras Gutiérrez, Pablo José},
}