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How to provide low energy consumption and high packet delivery ratio are considered the major issues in the protocol design for the Wireless Sensor Networks (WSNs). The main focus of this paper is to reduce the number of data transmissions within the WSNs for decreasing the energy consumption of the sensor nodes. In the wired networks, the Steiner-Tree is regarded as the optimal approach for constructing the multicast structure for specific senders and receiver. However, the results can not be directly applied to the wireless environment. In this paper, an Energy Conserving Multicast Routing (ECMR) protocol is proposed to reduce the total number of relaying nodes for the construction of a multicast tree.
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