A Hierarchical Online Reprogramming Method of Wireless Sensor Networks

In WSN (wireless sensor network), due to the changes of environment and application demands, we need to configure and reprogram the node online. This paper presents a cluster based hierarchical structure program image dispatching method, each cluster using different wireless channel, to avoid the message collision effectively. In the meantime, a paging mechanism-based retransmission is introduced, which uses the bit vector to trace the page lost, resulting in the little consuming of the RAM maintaining all the state of the pages. Finally we evaluate this method from the transmitting reliability, storage occupies and energy consumption and so on. The results show that this method can reprogram the node reliably in the complex situations