在這一篇論文中，我們分析了使用方向性天線與控制功率的好處，提出了兩個新 的 MAC 通訊協定。第一個新協定叫做 F-DMAC，主要改善 D-MAC Scheme 2 的空間 使用率，而且我們設計了一個新的 Handshake 機制，透過 DTS 封包的傳送，可以解決 其可能帶來的碰撞問題。另外一個新協定叫做 PCF-DMAC，這個協定把控制傳輸功 率加到方向性天線中，透過減少傳輸距離的方式來提升空間使用率，並延用 F-DMAC 的 Handshake 機制來避免碰撞的發生。另外，這兩個新的協定，都使用了 NIT 來紀錄 其他節點的位置，因此配備方向性天線的節點，可以不使用 GPS 而得知其他節點的 位置。
經過實驗分析之後，我們可以發現在基本情況下，F-DMAC比IEEE 802.11與D-MAC 2 有著更好的效能表現。而在比較複雜的Multi-Hop、Mesh Network情況下F-DMAC也 因為避免deafness與collision的發生，而有比較好的效能表現。PCF-DMAC則是在一個 區域中，可以讓多個連線同時進行傳輸，因此在網路流量也比IEEE 802.11、D-MAC 2、F-DMAC有更好的表現。相較D-MAC Scheme 2，我們所提出的F-DMAC與
PCF-DMAC通訊協定從模擬出來的結果中，可以發現有效的增加空間使用率並減輕 deafness與collision的問題。
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