Abstract—Wireless sensor networks have many applications such as industrial control, building automation, environmental monitoring, etc. IEEE 802.15.4 is a standard defined for WSN MAC layer. We present a new analytical model to evaluate the behavior of multihop IEEE 802.15.4 with unslotted CA/CSMA. Our objective is finding an expression of the busy channel probability as a function of the transmission probabilities of neighboring nodes. We join the MAC layer and traffic flow in this model and apply it to mesh network. OPNET is used as a simulation tool. The model is validated by evaluating the node throughput and the results are acceptable.

Index Terms—Analytical model, OPNET, IEEE802.15.4, wireless sensor networks.

Ola Hussein is with the Alexandria Institute of Engineering and Technology, Egypt (e-mail: eng_electola@yahoo.com).
Nayera Sadek is with the Alexandria University.
Said Elnoubi is with the Electrical Engineering Department, Alexandria University.
M. R. M. Rizk is with the Virginia Polytechnic and State University, Virginia, U.S.A.

Cite:Ola Hussein, Nayera M. Sadek, Said Elnoubi, and Mohamed R. M. Rizk, "Analytical Model of Multihop IEEE 802.15.4 with Unslotted CA/CSMA," International Journal of Computer and Communication Engineering vol. 3, no. 3, pp. 226-230, 2014.