Faridi, AzadehPalattella, Maria RitaLozano Solsona, AngelDohler, MischaBoggia, GennaroGrieco, Luigi AlfredoCamarda, Pietro2012-01-242012-01-242010Faridi A, Palattella M R, Lozano A, Dohler M, Boggia G, Grieco L A, Camarda P. Comprehensive evaluation of the IEEE 802.15.4 MAC layer performance with retransmissions. IEEE Transactions on Vehicular Technology. 2010; 59(8): 3917-3932. DOI 10.1109/TVT.2010.20637200018-9545http://hdl.handle.net/10230/16131Supported by IEEE 802.15.4 standardization activities, embedded networks have been gaining popularity in recent years. The focus of this paper is to quantify the behavior of key networking metrics of IEEE 802.15.4 beacon-enabled nodes under typical operating conditions, with the inclusion of packet retransmissions. We corrected and extended previous analyses by scrutinizing the assumptions on which the prevalent Markovian modeling is generally based. By means of a comparative study, we singled out which of the assumptions impact each of the performance metrics (throughput, delay, power consumption, collision probability, and packet-discard probability). In particular, we showed that - unlike what is usually assumed - the probability that a node senses the channel busy is not constant for all the stages of the backoff procedure and that these differences have a noticeable impact on backoff delay, packet-discard probability, and power consumption. Similarly, we showed that - again contrary to common assumption - the probability of obtaining transmission access to the channel depends on the number of nodes that is simultaneously sensing it. We evidenced that ignoring this dependence has a significant impact on the calculated values of throughput and collision probability. Circumventing these and other assumptions, we rigorously characterize, through a semianalytical approach, the key metrics in a beacon-enabled IEEE 802.15.4 system with retransmissions.application/pdfeng© 2010 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works./nThe final published article can be found at http://dx.doi.org/10.1109/TVT.2010.2063720Xarxes d'àrea local sense filProtocols de xarxes d'ordinadors -- Avaluacióinfo:eu-repo/semantics/articlehttp://dx.doi.org/10.1109/TVT.2010.2063720IEEE 802.15.4ZigBeeMedium Access Control (MAC) layerMultiaccess communicationinfo:eu-repo/semantics/openAccess