doi:10.1109/LWC.2018.2873347engOrtín Gracia, JorgeCesana, MatteoRedondi, Alessandro Enrico CesareCanales Compés, MaríaGállego Martínez, José RamónAnalysis of Unslotted IEEE 802.15.4 Networks with Heterogeneous Traffic ClassesART-2018-109399We propose a modeling framework composed of a Markov chain and the related coupling equations to evaluate the performance of unslotted IEEE 802.15.4 wireless sensor networks based on CSMA/CA Medium Access Control. Different from the related literature, the proposed model is able to capture heterogeneous classes of nodes with class-specific traffic generation rate and includes a more refined calculation of the probability of finding the channel busy during the carrier sensing process. The proposed model is used to derive class-specific performance figures including the probability of a successful transmission and the average delay for a successful/unsuccessful transmission.2018http://zaguan.unizar.es/record/14901210.1109/LWC.2018.2873347http://zaguan.unizar.es/record/149012oai:zaguan.unizar.es:149012IEEE Wireless Communications Letters 8, 2 (2018), 380-383All rights reservedhttp://www.europeana.eu/rights/rr-f/info:eu-repo/semantics/openAccess