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研究生:連振宏
研究生(外文):Jhen-hong Lian
論文名稱:在IEEE802.15.4低速率無線個人區域網路下之適應性超碼框調整機制之研究
論文名稱(外文):A study on adaptive superframe adjustment scheme (ASFAS) in IEEE 802.15.4 LR-WPAN
指導教授:黎碧煌
指導教授(外文):Bih-Hwang Lee
學位類別:碩士
校院名稱:國立臺灣科技大學
系所名稱:電機工程系
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2008
畢業學年度:96
語文別:中文
論文頁數:54
中文關鍵詞:IEEE 802.15.4低速率無線個人區域網路超碼框無線感測網路
外文關鍵詞:IEEE 802.15.4 LR-WPANSuperframeWireless Sensor Network
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無線感測網路(wireless sensor network; WSN)是由大量的感測節點所組成。為了滿足應用需求,大部分的感測節點均以電池為主要的能量供應,因此在無線感測網路中,能量消耗一直是很重要的研究議題。當裝置在資料傳送時發生碰撞,便需要重新傳送資料,故會造成額外的能量消耗且降低無線感測網路的壽命。
以IEEE 802.15.4標準而言,採用超碼框結構來做資料的傳送。然而該標準並沒有辦法根據整體網路的狀況,適應性的調整超碼框。因此當網路裝置數量增加與負載提高時,在有限的活動區間內將造成裝置傳送機會減少以及碰撞機率增加,使得整體網路效能降低。
為了解決上述問題,故本論文提出適應性超碼框調整機制(adaptive superframe adjustment scheme; ASFAS),根據協調者觀測到的某些特徵,如超碼框使用比例、裝置碰撞比例等,適應性調整超碼框,以增加裝置傳輸機會並且提升整體網路效能。本論文所提出的機制與IEEE 802.15.4標準以及先前被提出的機制將使用模擬的方式比較。從模擬的結果得知,本論文所提出的機制,對於有效產能、傳輸延遲及能量消耗均有較好的表現。
Wireless sensor networks (WSN) is constituted by a large number of sensor nodes. In order to satisfy the application requirement, most sensor nodes use battery as its main energy source. Furthermore, energy consumption has been very important research topic in wireless sensor networks. With higher traffic load, the collision probability will be higher. Thus, the power consumption of sensor node will be increased, and the life time of wireless sensor networks will be decreased.
In IEEE 802.15.4 standard, superframe structure is used for data transmission. However, the duty cycle of the superframe structure cannot be dynamically adjusted according to the situation of entire network. Thus, when the number of devices and traffic load increase, the insufficient of active periods will decrease the transmission opportunities of devices and increase the collision probability. Thus, the above problems will cause the performance of entire network deteriorated.
In order to solve the above mentioned problems, we proposed the adaptive superframe adjustment scheme (ASFAS), it can dynamically adjust the duty cycle of the superframe according to the certain features observed by the coordinator, like the occupied proportion of superframe and collision proportion of devices. Thus, it can increase transmission opportunities of devices and improve the performance of entire network. We will compare our proposed scheme with some previous schemes and IEEE 802.15.4 standard through simulations. The simulation results of goodput, delay and power consumption shows the improvement of our scheme.
中文摘要 iv
英文摘要 v
圖目次 viii
表目次 xi
第一章 緒論 1
1.1 簡介 1
1.2 研究動機與目的 2
1.3 章節概要 3
第二章 IEEE 802.15.4標準概述 4
2.1 IEEE 802.15.4標準簡介 4
2.1.1 IEEE 802.15.4標準之網路拓樸結構 5
2.1.2 IEEE 802.15.4標準之實體層介紹 6
2.1.3 IEEE 802.15.4標準之媒介存取控制副層介紹 8
2.2 相關研究 19
第三章 適應性超碼框調整機制介紹 21
3.1 系統基本架構 21
3.2 協調者之流程 24
3.3 裝置之流程 27
第四章 系統模擬與結果 29
4.1 模擬環境及參數 29
4.2 效能評估項目 30
4.2.1 有效產能(goodput) 30
4.2.2 平均傳輸延遲(average delay per packet) 31
4.2.3 能量消耗(energy consumption) 31
4.3 結果分析與比較 32
4.3.1 有效產能分析與比較 32
4.3.2 平均傳輸延遲分析與比較 35
4.3.3 能量消耗分析與比較 38
4.3.4 超碼框級數變化之結果 40
4.3.5 超碼框級數變化之平均值結果 45
第五章 結論及未來研究 48
參考文獻 49
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