隨建即連網路為沒有固定的基礎架構或中央管理者的無線網路，每一個無線節點可透過直接無線鏈結的方式通信，或是利用中間節點以連續多點跳躍的無線鏈結方式來通信。在隨建即連網路中，由於節點的任意地移動，使得網路的拓撲變動頻繁且無法預期，加上頻寬與電池電量的限制。這些特性使得這類型的網路型態需要一種新的設計及操作方式。

　　多點廣播通信在隨建即連網路裡有著許多重要的應用，比如視訊會議、遠距教學和隨選視訊等等。近來已經有一些不同的多點廣播協定在隨建即連網路中被提出來，不過大多缺乏Power消耗的考量，因此減少了整個網路的存活時間，所以在這篇論文裡，我們的重點放在擁有功率控制的多點廣播協定上，我們將採用叢集方式及Power的繞路機制來重新設計ODMRP（On-Demand Multicast Routing Protocol）。我們預期將改進ODMRP效能方面的問題、網路的可擴充性及增加網路的存活時間。

　Ad hoc networks have no fixed infrastructure or central administration ，and each host must communicate via either direct wireless link or multihop wireless links through a sequence of intermediate nodes。In an Ad hoc network，nodes move arbitrarily ,thus making the network topology change frequently and unpredictably，Moreover, the bandwidth and battery power are limited。These characteristics need a new way of designing and operating this type of networks

　　Multicast communication is an important operation for many applications of Ad hoc networks。For instance，video conference, distance learning and video on-demand，etc。A few other multicast routing protocols have been recently proposed for Ad hoc networks，But lack of consideration about power consumption，thus decrease the network lifetime. So within this paper our focus is on the multicast protocol with power control mechanism，we will employ clustering and power-aware routing to redesign the ODMRP（On-Demand Multicast Routing Protocol）。We expect to improve the performance、network scalability and increase the network lifetime。

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