PDAA mechanism: a preemptive distributed address assignment mechanism

Our contribution in this paper focuses on addressing mechanism and autorouting in the tree topology. Actually, we improve on the address assignment mechanism which sponsored by ZigBee alliance. The ZigBee stack protocol is designed for sensor network which is widely used. This improved address assignment mechanism is called the preemptive distributed address assignment mechanism (PDAAM). Preemptive addressing is very useful, because in the design phase we can not predict the exact node density of the sensor networks, it is particularly suitable for the networks which contain uneven distribution of node density. Further, it gives a routing algorithm. The packet can be routed from a node to the next node in using the assignment pattern to design the nodes addresses.