無線隨建即連網路中的網路節點存在有電量有限的問題。目前研究中所提出節能(Energy-Efficient)方法僅考慮成功傳輸的電量消耗，並無特別考慮因干擾而碰撞，使得重傳次數增加的電量消耗。加上電量消耗的議題多僅考慮MAC層或網路層特性設計，沒有充分運用跨階層設計讓有效的電量消耗議題獲得解決。本論文根據不同的節點密度，衍生出電量消耗關係，進而建立繞徑計算的數學模型及模擬分析。本論文先預測無線網路的干擾範圍內節點產生碰撞機率，接著計算IEEE 802.11資料連結層協定下，基於功率控制與資料傳輸速率選擇所導致之資料重傳次數，最後結合上述二者，提出電量消耗為最小連結路徑成本的繞徑協定。透過跨階層設計的方式，將資料連結層中預測的重傳次數及功率控制大小，作為網路層中繞徑建立過程中，將封包傳輸時可能消耗的電量做為路徑成本，使整條路徑的能量消耗最低。本論文方法採用OPNET產生模擬結果與相關節能繞徑協定比較，在電量消耗與傳輸效能均獲得較佳的成果 Wireless ad hoc networks are powered by battery. To prolong the network connectivity, many researches is focused on energy-efficient routing protocols, but these protocols just designed by power control methods to solve power consumption problems without considering data retransmission may be another problem to incur power consumption by collision. Also, these energy-efficient routing protocols might use single rate to transmit data without select rate to adopt network environment. In this paper, we propose a Minimum Link Cost Routing (MLCR) protocol to decrease the energy consumption on routing in IEEE 802.11 based wireless ad hoc networks. Firstly, the link cost is built by power control and data retransmission estimate model for the power consumption problem within data rate adaptation in different density of nodes. Based on the model, the minimum link cost routing protocol is proposed to find the routing path with minimum power consumption and rate adaptation. Comparing to related energy-efficient routing protocols with OPNET, MLCR can be outperformance in power consumption and end-to-end throughput.
