New RF Models of the TinyOS Simulator for IEEE 802.15.4 Standard

Recently, wireless sensor networks have gained increasing attention from the industry as well as academia. Various research issues related with sensor networks are intensively proposed, and they are evaluated by some network simulators or real sensor platforms. One of the well-known simulators for wireless sensor networks is called TOSSIM. It can simulate with TinyOS source codes on the real testbed without any significant modifications. Although TOSSIM´s architecture and interfaces are well designed for wireless sensor networks based on IEEE 802.15.4 standards, its current RF model is too simple to support main features of the PHY stack of the IEEE 802.15.4. In order to enhance the accuracy of wireless simulation results and implement IEEE 802.15.4 standard, we design a new wireless propagation model and RF physical stack based on the two-ray ground path loss model and CC2420 RF transceiver. Our work contributes on the performance evaluation areas of wireless sensor networks and IEEE 802.15.4 WPAN standard using simulations.