在 Linux 環境下設計並實作具蜂巢式無線基地台之 IEEE 802.11 區域網路

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研究生：	洪偉能 Wei-Neng Hung
論文名稱：	在 Linux 環境下設計並實作具蜂巢式無線基地台之 IEEE 802.11 區域網路 Design and Prototyping Experiences of Multi-hop, Cellular IEEE 802.11 Wireless LANs
指導教授：	曾煜棋 Yu-Chee Tseng
口試委員:
學位類別：	碩士 Master
系所名稱：	資訊電機學院 - 資訊工程學系 Department of Computer Science & Information Engineering
畢業學年度：	89
語文別：	中文
論文頁數：	33
中文關鍵詞：	無線網路
外文關鍵詞：	multi-hop network, mobility, IEEE 802.11, cellular network, wireless communication
相關次數：	點閱：8 下載：0
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無線通訊時代的來臨是個無庸置疑的事實，相信再過不久，人們拿著掌上型電腦 (如 PDA) 隨時上網必定能夠實現。無線通訊的傳輸速率及品質，跟 Cell 的大小有關，我們分類成 micro-cell 及 macro-cell。我們的焦點放在 micro-cell 的網路協定上。
我們取用了 Cellular IP 的觀念，把有線基地台 (BS) 改成為無線基地台 (Wireless BS) 的觀念。我們重新設計了繞徑演算法，讓使用者 (MH) 能把資料以 hop-by-hop 的方式，透過 up-link 傳到 Gateway (GW) 後送上 Internet。而從 Internet 回傳的資料會先送到 GW 再以 hop-by-hop 方式送到 MH。
我們也將協定在裝有 Mandrake Linux 8.0 系統的 Notebook 上實作出來。實作的方式有很多種，我們選擇實作於無線網路卡的 module ?以減少程式開發時間，也較不容易造成系統當機。由於我們是把自行定義的 packet 差在 ether header 與 ip packet 之間，因此能夠獨立於 MAC 及 IP 層之外。
在效能的測試上，我們發現各種網路應用程式，包括 Web、FTP、Telnet 等都能正常運作。

簡介 ...............................1
協定設計 ...........................4
1 Cellular IP 的特點..............4
2 網路結構........................4
3 Up-link Table...................6
3.1 建立 BS 的 up-link..........6
3.2 建立 MH 的 up-link..........7
4 Down-link Tables (Routing Table and Paging Table)..8
4.1 MH 狀態轉換.................8
4.2 建立 Down-link..............9
5 Handoff........................10
系統運作流程.......................11
1 LLC 層協定.....................11
2 Data 傳送流程..................12
2.1 Data 上傳..................12
2.2 Data 下傳..................14
3 CWBS Packet 格式...............15
3.1 GW-BEACON Packet...........15
3.2 BS-BEACON Packet...........15
3.3 PAGTING-UPDATE Packet......16
3.4 ROUTING-UPDATE Packet......16
3.5 PAGING Packet..............17
3.6 DATA Packet................17
系統設定...........................19
1 網路設定.......................19
2 PCMCIA 安裝與設定..............20
2.1 PCMCIA 下載安裝............20
2.2 設定 config.opts 檔........21
2.3 設定 network.opts 檔.......22
2.4 重新啟動 PCMCIA............22
3 安裝 DHCP Server/Client........23
4 ipchains 安裝與設定............24
程式處理細節.......................26
1 CWBS Packet 的處理.............26
2 CWBS 模式控制..................28
系統運作效能.......................30
結論 ..............................31

                                

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