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Figure 3 – uploaded by Yamini Sood
Figure 5 REQUEST message sending. Direct diffusion!’ is very popular data aggregation routing used for Wireless Sensor Network. Direct diffusion combines the data coming from different sources by reducing redundancy and number of transmission which helps to maximize energy of network.The sensors inspect the occasions and deliver gradient of data. The sink request data by broadcasting message (interests). An interest goes hop-by-hop in a network. At the time of interest propagation over the network, the gradient is setup. The gradient is used to match the query of data for the base station. This gradient is set up byevery sensor node that gets enthusiasm toward sensor node from which it gets interest. This procedure continuous until the gradient is setup from source to base station. Gradient specifies an attribute value and direction. The gradient strength may be different toward different neighbours, which gives different amount of information flow. Loops are not checked at last stage and are removed. Directed diffusion consists of three steps that are sending request, building gradients, data dissemination. When interest matches with gradient, the path for the information flow from multiple path is formed (best possible path is chosen to prevent flooding).To reduce the communication cost data is assembled on the way.The primary concentration of this protocol is to locate the best accumulation way for
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