在無線感應網路中,排定感應裝置設備(node)的甦醒時間和休眠間期,是很重要的一環. 這兩個狀態,是決定顯示器(metrics)能量的消耗和保存的控制因素. 在本論文中,我們提議一個基於IEEE 802.15.4 標準的無線感應網路的”不同步MAC協議”. 這個“不同步MAC協議“的表現,是由兩個MAC layer 參數所決定,也就是”起動期間”和”甦醒間隔期間”. 我們需要選擇適當參數,運用到特殊感應網路環境之中,以期達成最好表現. 藉由甦醒周期間隔所達成的效果,我們提議這個”不同步MAC協議 ”,並且憑經驗推論出這些單一傳送和廣泛傳送模式的能量消耗的論點. 本論文的主題,是要縮小能量消耗以延長感應網路的壽命.

In wireless sensor network, scheduling wakeup time of a node and its sleep duration are important. These two aspects are the key element of controlling critical performance metrics such as energy consumption and latency. In this paper we propose asynchronous MAC protocol for wireless sensor networks based on IEEE 802.15.4 standard. The performance of asynchronous MAC is usually determined by two MAC layer parameters, i.e. the active duration and the wakeup interval. We need to proper select these two parameters for specific sensor networks environment to achieve the best performance metrics. By showing the effect of wakeup interval, we proposed and empirically validate analytical energy consumption for unicast transmission and broadcast transmission model for asynchronous MAC protocol. The objection of this paper is to minimize the energy consumption of proposed model, so that we can enhance sensor network lifetime.

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