Design and Implementation of Energy Conservation Protocols for Wireless Sensor Networks

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Project title

Code/計畫編號

NSC96-2221-E019-015-MY2

Translated Name/計畫中文名

無線感測網路省電協定之設計與實作

Project Coordinator/計畫主持人

Chih-Min Chao

Funding Organization/主管機關

National Science and Technology Council

Department/Unit

Department of Computer Science and Engineering

Website

https://www.grb.gov.tw/search/planDetail?id=1618493

Year

2008

Start date/計畫起

01-08-2008

Expected Completion/計畫迄

31-07-2009

Bugetid/研究經費

577千元

ResearchField/研究領域

資訊工程--硬體工程

無線感測網路透過感測器彼此協同合作以完成監控工作。因感測點大都是靠電池供電，因此，如何節省各節點的電力，以增加整個網路的運作時間是很重要的問題。IEEE 802.11標準省電協定的觀念，常被許多學者在設計無線感測網路省電協定時採用。IEEE 802.11標準的省電協定規定每一個節點必須週期性的，在每一個Beacon interval都醒來一段時間以確認是否需進行資料傳輸。這樣統一的醒睡機制並不能達到最佳省電效果。本計劃第一年之目的，即在無線感測網路中，利用Qourum system的觀念，設計省電效率更好的省電協定，並分析其優缺點。無線感測網路收集到的資料，都是傳往固定的節點(Sink node)，這樣的環境很容易造成電量空洞的問題。本計畫第二年，我們將嘗試把第一年設計之Quorum-based省電機制，透過模糊控制的方式，使感測點能依其封包傳輸量調整所選用的Quorum表格以控制其醒睡頻率，再配合動態選擇回傳路徑的觀念，期能盡量平均各個感測點的電量消耗，以達延長網路效能之目的。此外，我們將實作本計畫每一年所設計的協定於Mote Mica 2網路上，實際驗證所設計省電協定之效果。 Wireless Sensor Networks are mainly designed for environment surveillance where wireless sensor nodes cooperate to get their job done. Generally, wireless sensors are battery powered. Therefore, it is crucial to use sensor nodes』 battery resources efficiently. The concept of IEEE 802.11 Power Saving Mode (PSM) is widely adopted in wireless sensor networks for energy conservation purpose. In IEEE 802.11 PSM, a host must wake up at every beacon interval, to check if it should remain awake. Such a uniform wake up scheme is not optimal in terms of power efficiency. In the first year of this project, we will adopt the concept of quorum systems to develop a more efficient energy conservation protocols for wireless sensor networks. In wireless sensor networks, the destination is fixed – it is always the sink node. Such a data transmission environment may produce the energy hole problem easily. In the second year of this project, we will adopt fuzzy control to revise the energy conservation protocols developed in the first year to fit the wireless sensor network environment. The revised protocol must be capable of dynamically adjusting the quorum table size used in each sensor node in order to reflect each node』s traffic condition. Meanwhile, the protocol must also be capable of selecting a suitable route back to the sink node in order to balance relay overhead of each sensor node. The goal of the proposed protocol is to prolong the life time of the wireless sensor network. In addition to develop energy conservation protocols, we will also implement those protocols in Mote Mica2 modules to investigate if they work for a real sensor network.

Keyword(s)

無線感測網路
省電協定
行動計算
Wireless Sensor Network
Energy Conservation Protocol
Mobile communication

DSpace CRIS

Design and Implementation of Energy Conservation Protocols for Wireless Sensor Networks

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