English  |  正體中文  |  简体中文  |  Items with full text/Total items : 52058/87187 (60%)
Visitors : 8899909      Online Users : 78
RC Version 7.0 © Powered By DSPACE, MIT. Enhanced by NTU Library & TKU Library IR team.
Scope Tips:
  • please add "double quotation mark" for query phrases to get precise results
  • please goto advance search for comprehansive author search
  • Adv. Search
    HomeLoginUploadHelpAboutAdminister Goto mobile version
    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/52355

    Title: 無線感測網路中以傳輸功率控制為基礎的省電休眠排程
    Other Titles: A power saving sleep scheduling based on transmission power control for wireless sensor networks
    Authors: 吳雅蘭;Wu, Ya-lan
    Contributors: 淡江大學資訊工程學系碩士在職專班
    Keywords: 無線感測網路;生命週期;傳輸功率控制;休眠排程;Wireless sensor networks;Lifetime;Transmission Power Control;Sleep Scheduling
    Date: 2010
    Issue Date: 2010-09-23 17:34:18 (UTC+8)
    Abstract: 無線感測網路(Wireless Sensor Networks)已經被視為一項未來的偵測技術,將大量的感測器節點隨機分佈後可以提供許多廣泛的應用,例如:追蹤某種目標物之狀態、環境之監測、週遭安全性之提升等。在無線感測網路中,因為感測器節點只能使用有限的能源的關係,例如電池,所以當感測器節點的能源耗盡時,會導致整個無線感測網路的功能受到影響,甚至造成整個網路無法運作。因此管理感測器的能源成為一個重要的議題,藉由有效的管理感測器的能源才能延長無線感測網路的生命週期(Lifetime)。
    要節省能源最好的方式就是將感測器節點的電源直接關閉,但是被關閉的感應器節點就不再屬於網路的一部份,無法執行資料的傳輸與接收,可能會造成資料的遺失,因此何時該關閉電源何時該打開電源的權衡便顯得十分重要,一方面要延長無線感測網路的生命週期(Lifetime),而另ㄧ方面又不能造成太高的資料遺失率,在“應用於無線感測器網路中以休眠排成為基礎之電源管控機制"中所提出的休眠排程演算法(Sleep Scheduling),因為其無法保證感測器節點是否有鄰近的感測器節點(neighbor node)可以代傳資料,明顯地容易造成資料的遺失。因此本篇論文將針對這個問題進行改善,提出以傳輸功率控制為基礎的改善休眠排程來解決資料遺失的問題。
    Wireless sensor networks (WSNs) have become a sensing technology of future. A large number of sensor nodes can be randomly sprayed in an area and support many applications such as tracking the status for a target, monitoring environment and improving public security. The sensor nodes of WSNs can only use limited energy like battery. When the energy has been exhausted, WSNs cannot work anymore. In order to extend the lifetime of WSNs, the management of the sensor''s energy is an important issue.
    The best way to save energy is to shutdown the power of sensor node directly. The sensor node which the power is shutdown is not belonging to the WSN and cannot do the data transmission and receive anymore. To shutdown the power of sensor node may cause the data loss. So when to turn off the power and when to turn on the power is become vary important. Shutdown the sensor nodes may extend the lifetime of WSNs, but also may cause the high packets loss rate. The Sleep Schedule addressed on “A Power Control Mechanism based on Sleep Scheduling for Wireless Sensor Networks” cannot guarantee that neighbor node has ability to do transmission, because the node may be in sleep. And it may result in data loss. This thesis would use the transmission power control technology to improve this issue and reduce the packets loss rate.
    In this thesis, use the improved algorithm and the original algorithm to do simulation. The original algorithm can complete 43 rounds and has some data loss. The network without sleep scheduling algorithm can complete 35 rounds and has no data loss. The improved algorithm which is better than the network without sleep scheduling algorithm can complete 40 rounds and has no data loss. As a result, the improved algorithm proposed in this thesis can effectively resolve the data loss problem of the original algorithm.
    Appears in Collections:[資訊工程學系暨研究所] 學位論文

    Files in This Item:

    File SizeFormat

    All items in 機構典藏 are protected by copyright, with all rights reserved.

    DSpace Software Copyright © 2002-2004  MIT &  Hewlett-Packard  /   Enhanced by   NTU Library & TKU Library IR teams. Copyright ©   - Feedback