Grid-based directed diffusion for wireless sensor networks

Directed diffusion is a data dissemination protocol for wireless sensor networks.In directed diffu- sion,flooding is used for dissemination of interest and exploratory data,which will bring broadcast storm resulting in substantial energy consumption of networks.A grid-based directed diffusion is presented to improve the energy efficiency of directed diffusion.Virtual geographic grid clusters are constructed by self-organization of nodes using geographic location information.The flooding of interest and exploratory data of original directed diffusion is limited in cluster head nodes.The simulation results and testhed ex- periments show that the method effectively reduces the network energy consumption.This gain is not achieved at the cost of either delivery ratio or the delay.Importantly,the decreased load also leads to a better delivery ratio and lower delay.