Date Added: Jan 2010
Data packets collected in wireless sensor networks may contain information of different importance, including regular updates and critical data triggered by important events. In a converge-cast tree, packets routed towards the data sink may be dropped due to network contention. In order to improve the reliability of critical packets, the authors propose a prioritized transmission scheme named Pritrans. By overhearing the data packets transmitted by the neighbors, each node will compute the consensus relation based on the packet contents and maintain a consistent ranking within the neighborhood. The parent node will send feedback messages to adjust the packet rate of child nodes proportional to their ranking, such that the channel can be prioritized for transmission of important packets.