Date Added: Jul 2011
Wireless Sensor Networks (WSN) based on the IEEE 802.15.4 standard are in a constant expansion. Applications like production control, building control are more and more based on WSN because of their energy efficiency, self organization capacity and protocol flexibility. The IEEE 802.15.4 standard defines 3 network topologies: the mesh topology, the star topology and the Cluster-Tree topology. However, the construction of Cluster-Tree networks based on the beacon mode is still undefined by the IEEE 802.15.4 standard. A Beacon Cluster-Tree topology has the advantage of giving all the benefits of the Beacon mode (Synchronization, QoS support through Guaranteed Time Slots) and at the same time, allows the construction of large networks to cover large areas.