The Research Of Energy-Effective Opportunistic Multicast Routing Protocol For Wireless Sensor Networks

In wireless sensor networks, the energy nodes need to work be supplied by theirown battery, sensors once be deployed to the environment, it is difficult to charge thebattery for them. So how to improve the utilization efficiency of the battery of sensorsis one of the key problems in wireless sensor networks. The base station in order tocollect the information from the environment around it, which will send commandmessages to a group of destination nodes, if we use multicast routing to realizeone-to-many mode will reduce the consumption of network bandwidth, improve thetransmission efficiency.In this paper, we analyses static and dynamic wireless sensor networks for theproblem of energy efficient. In the static environment, we use the idea of clusteringand sleep/awake, by re-dividing cluster into smaller ones with the adjacent nodes forthe unit. Then the different levels of sub cluster head using synchronous asymmetricaldormancy mechanism, the internal cluster node use synchronous symmetricaldormancy mechanism, so that when the nodes do not receive information, they are inthe energy saving state of dormancy as far as possible. The result shows that themethod can improve the life cycle and energy efficient of the networks.The paper presents energy-efficiency opportunistic multicast routing protocol(E-OMRP) for the mobile wireless sensor networks. The protocol divides the networkinto grids, and each grid includes several nodes, the nodes in the same grid determinethe priority in light of the transmission delay factor and expected transmission cost.Then the relay nodes use the opportunistic routing to send messages to the next hopbased on the order of priority. When the destinations receive a message from relaynodes, they select the optimal path in accordance with the transmission delay andlinks cost, and transmission acknowledgement to source along the optimal pathselected. After the source has received all the acknowledgements from differentdestinations, it uses the method of path aggregation to aggregate all optimal pathsselected. If all nodes in the current grid transmission messages failure, the neighborgrids are in charge of retransmission. The results of simulation show that, comparedwith traditional multicast routing, E-OMRP is effective in reducing the consumptionof links cost, so that it improves the link reliability and reduces the delay.