关键词: 时延, 无线传感器网络, 数据聚合, 聚合时机

Abstract: It is a very important problem when to aggregate and forward data in wireless sensor network. This paper proposes an adaptive mechanism to solve it. It chooses aggregation time for sensor nodes based on both their locations and the number of their children in the aggregation tree, allocating longer waiting time for nodes with more children and vice versa. Thus it ensures nodes with more children efficient time to do data aggregation. Simulations show it achieves high data delivery rate and its energy cost is less than similar algorithms. Moreover, since a lot of data packets can arrive at the sink earlier, it can response quickly to user due to shorter delay.

Key words: delay, wireless sensor network, data aggregation, timing control