The Study of Directed Diffusion Routing Protocol Based on Clustering for Wireless Sensor Network

In wireless sensor network, directed diffusion is a classical and data-central routing protocol, in which routing creation mainly depends on the plain flooding. For suppressing the redundant message in the flooding so as to improve its energy-efficiency, a new directed diffusion routing protocol named DDBC (directed diffusion based on clustering) is proposed after the study of clustering mechanisms and algorithms. DDBC is an energy-efficiency directed diffusion routing protocol that depends on reducing network topology by clustering and suppressing the redundant message in plain flooding to improve energy-efficiency. DDBC adopt the passive clustering strategy, the selection of cluster head takes a mechanism named "first declaration wins", the gateway node is selected according to the rule that makes trade-offs between the network robust and the energy-efficiency. The creation and maintenance of DDBC routing are implemented by adding some information of cluster to the original packet structure. This paper present DDBC and its implementation algorithm in detail, and gives a simulation of the routing protocol in NS2, the results show that DDBC is more energy-efficient and also has a good performance even when the number of nodes increased in large scale