| Summary: | 碩士 === 國立臺灣科技大學 === 資訊工程系 === 95 === In this thesis, we focus on the multicast in Zigbee network. The multicast is a useful operation that facilitates group communication in WSN (wireless sensor network). Many kinds of methods for multicasting are discussed in different kinds of network environments. The Zigbee network, however, is characterized as low data rate and low cost. Many of the multicast methods are not suitable for this kind of sensor network. For example, in the ODMRP the source need periodically send Join Request and receivers need rebroadcast Join Table back to the source to maintain the forwarding group state; in the MAODV need to maintain a multicast tree to use to forward packet. If the tree link is broken, then it takes much more effort to rebuild the multicast tree. On the other side, group leader also need to periodically broadcast the group hello message to hold the network entirely. All these disadvantages will reduce the multicast performance in Zigbee network.
Here, we use the characteristic of Zigbee network, like the logical tree structure when network build up and propose the forwarding group selection algorithm on it. This algorithm will reduce the overhead of routing information to build in multicast. We also use the multi-destination and stateless idea to reach the goal of multicast transmission.
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