無線感測網路MAC層之能量效率研究

A Study on Energy Efficiency of MAC Layer in Wireless Sensor Networks

王立銘(Li-Ming Wang)

指導教授 ： 黃永發

朝陽科技大學/資訊學院/資訊與通訊系碩士班/碩士(2012年)

摘要

本論文針對無線感測網路MAC層協定提出具低延遲之能量效率排程 (Low-Delay Energy Efficiency Scheduling, LDEES)機制。我們對簡易之十個節點之無線感測網路探討無適應性偵聽(Without Adaptive Listen, WOAL)與有適應性偵聽(With Adaptive Listen, WAL)機制之網路延遲與能量消耗之效能比較，由模擬結果知，網路延遲隨著責任週期(Duty Cycle)之增加而減低，而能量消耗則隨著責任週期(Duty Cycle)之增加而增加，此外，WAL機制與WOAL機制相比，在每個週期中可增加一個傳輸跳躍數(Hop)，可進一步減低網路延遲。因此我們依據網路節點數的不同，即傳輸路徑所需之傳輸跳躍數(Number of Hops)，來調整最適當之責任週期，而達到所可忍受之延遲並降低能量消耗，以獲得較佳之能量效率。

關鍵字

責任週期 ； 傳輸跳躍數 ； MAC協定 ； 無線感測網路 ； 適應性偵聽 ； 能量效率

並列摘要

Wireless sensor network (WSN) is a power aware wireless networks due to the used energy-limited battery in sensor nodes. Therefore, in this thesis, the energy efficiency of MAC layer is investigated. Thus a low-delay energy efficiency scheduling (LDEES) scheme is proposed to improve the energy efficiency for the WSN. In this thesis, a ten-point WSN is proposed to investigate the network delay and energy consumptions. Both schemes of with adaptive listening (WAL) and without adaptive listening (WOAL) are proposed to compare the performance of network delay and energy consumptions in WSN. Simulation results show that the network delay is increased with the increasing of duty cycle of nodes. Moreover, the energy consumption is increased with the duty cycle. Furthermore, the WAL scheme can add a hop in one cycle than WOAL scheme without increasing more energy consumptions. Therefore, according to the number of nodes in network, ie. the number of transmission hops in the transmission route, we adjust the duty cycle of nodes to meet the minimum delay and minimize the energy consumption as well.

並列關鍵字

Energy efficiency ； Transmission hops ； Adaptive listening ； MAC layer ； Duty cycle ； Wireless sensor network

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