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研究生:傅堂倚
研究生(外文):Tarng-Yi Fu
論文名稱:IEEE802.16無線網路之換手協調機制研究
論文名稱(外文):Performance Study of Handoff Schemes in IEEE 802.16 Wireless Networks
指導教授:歐陽彥杰
學位類別:碩士
校院名稱:國立中興大學
系所名稱:電機工程學系所
學門:工程學門
學類:電資工程學類
論文種類:學術論文
畢業學年度:97
語文別:中文
論文頁數:86
中文關鍵詞:媒介獨立換手接收訊號強度
外文關鍵詞:media independent handoverreceiver signal strength indicator
相關次數:
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目前 IEEE 802.16e 的無線網路環境中是利用硬式換手的機制,當將與下一個目標基地台建立起新的連線時就已經與目前的服務基地台的連線中斷,然而,硬式換手機制在建立連線過程中如果換手程序失敗可能發生無法補救的錯誤。
在本篇論文中,我們提議由IEEE 802.21所制定的MIH機制,並採用它的架構來取代IEEE 802.16e無線網路環境中的換手程序,而在MIH架構中所提出的LGD觸發機制可以應用在換手的環境中使封包的遺失減至最少,當利用接收的RSSI作為觸發機制的一部份時我們並且觀察其效能,當所接收到的訊號強度已經開始低於LGD功率強度門檻時就啟動觸發。利用MIH機制在跟目標基地台建立連線時仍可以成功繼續發布連線訊息給舊的服務基地台,使用MIH的好處是可靠性,因為只有建立新的連線之後才釋放掉舊的連線。
網路模擬軟體NS-2已經成功的在IEEE 802.16e無線網路中模擬出MIH機制,模擬的結果顯示這一個建議方法在IEEE 802.16e的無線網路換手期間可以有效地增加傳輸的吞吐量及降低封包的遺失。
Currently hard handoff is performed for IEEE 802.16e wireless networks while the serving connection under the current BS should break before creating a new connection for the target BS. However, the hard handoff method could cause a unrecoverable damage for the connection if the handoff process fails.
In this thesis we propose a media independent handover (MIH) services, defined in the IEEE 802.21, and adopt this framework to replace the handoff process in IEEE 802.16e wireless networks. The link going down (LGD) trigger form MIH framework can be used to minimize the packet lost while a handover is performed. We also investigate the performance by using the receiver signal strength indicator(RSSI) as part of the trigger mechanism. It is triggered when the received signal level is below the LGD power threshold. Using the MIH method the connection is established to the target BS and after successfully continuing communications the old serving BS is released. The benefit of using MIH is the reliability because only a new connection is established and after that the old connection is released.
The network simulator (NS-2) was successfully used to simulate the MIH method for IEEE 802.16e wireless networks. Simulation results show that the proposed method could effectively increase the transmission throughput and reduce packet lost during the handoff for IEEE 802.16e wireless networks.
誌謝 i
摘要 ii
Abstract iii
目錄 iv
表目錄 vi
圖目錄 vii
第一章 簡介 1
一、WiMAX 技術簡介 2
二、IEEE 802.16 技術標準 4
三、IEEE 802.16 網路架構 5
四、研究動機 7
五、研究目的 8
六、論文架構 8
第二章 背景與相關研究 10
一、換手目的及時機 10
二、換手機制研究 10
三、IEEE 802.16e 換手機制 15
(一)網路重新進入程序(network re-entry procedure) 17
(二)網路拓樸探測(Network Topology Acquisition) 19
四、換手程序 22
(一)服務細胞重新選擇(Cell reselection) 22
(二)換手決定和啟動(HO Decision and Initiaton) 25
(三)對目標基地台進行下鏈同步(Synchronization to target BS downlink) 25
(四)對目標基地台執行測距(Ranging) 25
(五)終止服務(Termination of MS Context) 25
(六)換手取消(HO Cancellation) 26
五、IEEE 802.16e – 硬式換手機制 27
六、媒介獨立換手機制(Media Independent Handover,MIH) 28
(一)媒介獨立事件服務(Media Independent Event Service) 29
(二)媒介獨立命令服務(Media Independent Command Service) 30
(三)媒介獨立資訊服務(Media Independent Information Service) 30
七、MIH換手觸發事件 30
八、模擬平台介紹 31
(一)NIST Seamless and Secure Mobility 模組 31
第三章 換手觸發機制 35
一、IEEE 802.16e 硬式換手-離線觸發(link down trigger)機制 35
二、媒介獨立換手(MIH) – 以IEEE 802.16e 為例 37
(一)IEEE 802.16e-即將離線(link going down)觸發機制 39
第四章 硬式換手與媒介獨立換手的模擬 42
一、模擬環境 42
(一)模擬拓墣情境 42
(二)硬式換手和媒介獨立換手之網路模擬環境 47
(三)模擬平台畫面 48
二、模擬結果與討論 49
(一)情境一、硬式換手的 link down 效能表現 49
(二)情境二、媒介獨立換手的 link going down 效能表現 57
三、媒介獨立換手的整體效能分析 81
第五章 結論與未來展望 83
參考文獻 85
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