ABSTRACT
IEEE 802.15.4 is a standard uniquely designed for low rate wireless personal area networks (LR- WPANs). It targets low data rate, low power consumption and low cost wireless networking, and offers device level wireless connectivity. The IEEE 802.15.4 is designed for applications like wireless monitoring and control of lights, security alarms, motion sensors, thermostats and smoke detectors. IEEE 802.15.4 specifies physical and media access control layers that have been optimized to ensure low-power consumption. The MAC layer defines different network topologies, including a star topology (with one node working as a network coordinator, like an access point in IEEE 802.11), tree topology (where some nodes communicate through other nodes to send data to the network coordinator), and mesh topology (where routing responsibilities are distributed between nodes and master coordinator is not needed).
IEEE 802.15.4 is a standard uniquely designed for low rate wireless personal area networks (LR- WPANs). It targets low data rate, low power consumption and low cost wireless networking, and offers device level wireless connectivity. The IEEE 802.15.4 is designed for applications like wireless monitoring and control of lights, security alarms, motion sensors, thermostats and smoke detectors. IEEE 802.15.4 specifies physical and media access control layers that have been optimized to ensure low-power consumption. The MAC layer defines different network topologies, including a star topology (with one node working as a network coordinator, like an access point in IEEE 802.11), tree topology (where some nodes communicate through other nodes to send data to the network coordinator), and mesh topology (where routing responsibilities are distributed between nodes and master coordinator is not needed).
We have developed an NS2 simulator for IEEE 802.15.4 and conduct several sets of experiments to study its various features. In this project a star network topology and peer to peer network topology according to the 802.15.4 standard has been simulated with the simulator ns-2. The goals of this paper are to build a simulation model and to investigate different functional modes of IEEE 802.15.4 and their impact on energy consumption and network performance.
