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研究生:易志昌
研究生(外文):Zhi-Chang Yih
論文名稱:在移動式環境中為擷取區域資訊而設計之階層式快取策略
論文名稱(外文):Hierarchical caching policies for location-aware Information Retrievals in Mobile Environments
指導教授:童曉儒
指導教授(外文):Sheau-Ru Tong
學位類別:碩士
校院名稱:國立屏東科技大學
系所名稱:資訊管理系
學門:電算機學門
學類:電算機一般學類
論文種類:學術論文
論文出版年:2002
畢業學年度:90
語文別:中文
論文頁數:70
中文關鍵詞:地點感應資訊服務資料預載傳送排程行動網路服務品質快取管理
外文關鍵詞:location-aware information servicedata pre-fetchingtransmission schedulingmobile networkingquality-of-servicecache management
相關次數:
  • 被引用被引用:3
  • 點閱點閱:227
  • 評分評分:
  • 下載下載:30
  • 收藏至我的研究室書目清單書目收藏:2
由於近年來手持式行動設備與無線通訊的普及,地點感應服務(Location-aware Service) 漸漸受到重視,本論文專為此項服務而提出一階層式的網路架構,稱之為「地點感應式行動資訊整合網路 (Location-Aware Mobilized Information Integrated Networks (LAMIN))」,其基本原理是:使用者從衛星定位系統(GPS)取得目前所在地理位置,然後根據他對資訊類別的喜好與設定的服務品質,動態地自資料庫中擷取與該位置有關的資訊。此資料庫放置於Internet上,採用雙層的設計,頂層是中央伺服器存放著所有資料,底層是由一群區域伺服器所構成,暫存由中央伺服器透過有線網路所下載之資料,同時平均分擔透過無線網路傳送資料至使用者。在這樣的架構下,我們設計了多項管理機制,包括預載觸發、下載排程、資料快取管理等,而這些機制乃依據一套獎勵(reward)模型所建構,它的特色在於將行動環境下溝通的需求納入考量。透過模擬的結果我們得知,所提的機制的確能有效的達成─在行動環境下依使用者的偏好與服務品質獲取最有價值資訊的目的。
Due to the prevalence of handhold devices and wireless communications, the location-aware services have been gotten a lot of attention recently. In this thesis, we propose hierarchical network architecture, termed Location-Aware Information Integrated Networks (LAMIN), to provide such a service. In principle, a user gets his geographical location from Global Position System (GPS) and according to his personal information preferences and contracted Quality-of-Service (QoS), dynamically retrieve information associated with that location from a database. The database is deployed in Internet with two tiers. A central server archives the entire data collection. A group of regional servers cache data downloaded from the central server through wired links and evenly share the load of transmitting data to users through wireless links. Under this architecture, we design several management policies, such as pre-fetch triggering, download scheduling and data caching, based on a reward model, which stands out by taking the communication requirements in a mobile environment into account. The simulation results reveal that the proposed schemes can effectively achieve the objective of user’s gaining the most valuable information based on his personal preferences and contracted QoS in a mobile environment.
目錄
摘要 ……………………………………………………………I
ABSTRACT ………………………………………………………II
誌謝 ……………………………………………………………IV
目錄 ……………………………………………………………V
圖表索引 ………………………………………………………VII
1 緒論…………………………………………………………1
1.1 研究之背景、動機及目的……………………………1
1.2 章節概要………………………………………………8
2 文獻探討……………………………………………………9
2.1 預載……………………………………………………9
2.2 相關的置換策略………………………………………12
2.3 2G到3G的無線協定…………………………………14
2.3.1籃芽計劃 ………………………………………14
2.3.2 IEEE802.11b……………………………………14
2.3.3 GPRS ……………………………………………15
2.3.4 3G ………………………………………………15
3. 系統架構……………………………………………………18
3.1階層式快取架構………………………………………18
3.2各元件的功能及運作…………………………………20
4. 演算法設計…………………………………………………29
4.1 區域的劃分及觸發流程 ……………………………… 29
4.1.1 區域的劃分………………………………………29
4.1.2 觸發流程圖………………………………………32
4.2 CS到RS預載演法 ……………………………………33
4.2.1 CS到RS的預載設計量 …………………………33
4.2.2預載演算法 ………………………………………34
4.3 RS中的快取置換 ……………………………………41
4.3.1 快取置換的設計考量……………………………41
4.3.2 快取置換策略……………………………………42
4.4 RS到ME的下載策略 …………………………………45
5 模擬分析………………………………………………………48
5.1模擬的環境與假設 ……………………………………48
5.2 模擬的參數架構說明 …………………………………50
5.3 各實驗的模擬結果 ……………………………………52
5.3.1實驗1:比較預載的方式對hit ratio及hit reward ratio的影響 ……………………………………52
5.3.2 實驗2:不同等級的服務 ………………………57
5.3.3 實驗3:如何決定預載距離及下載距離 ………60
5.4 本章總結………………………………………………65
6 結論 …………………………………………………………66
參考文獻…………………………………………………………67
[1] 行動定位的應用 , http://www.ericsson.com.tw /ericsson/technology/t0502.htm
[2] 胡繼陽,無線通訊的未來GPRS與手持設備的結合,Jul. 2001 網路通訊 p43-48 ,2001
[3] 林淑鈴,為PDA打開影像之窗, PDA世界NO5, 1~2月號,2002
[4] Dennies Chang, 種種無線網路標準的迷思之二, http://www.3g.com.tw/columns/column_show.asp?txrfnbr=191&cgrfnbr=29
[5] Zhe Xiang, Qian Zhang, Wenwu Zhu, Yuzhuo Zhong,Cost-based replacement policy for multimedia proxy across wireless internet , Global Telecommunications Conference, 2001. GLOBECOM ''01. IEEE , Volume: 3 , 2001
[6] Kai Cheng,Y. Kambayashi, M. Mohania, Efficient management of data in proxy cache, Database and Expert Systems Applications, 2001. Proceedings. 12th International Workshop on , 2001
[7] Saied Hosseini-Khayat, Replacement algorithms for object caching, SAC ''98 - 1998 ACM Symposium on Applied Computing
[8] Kisup Ki, Hyukjoon Lee , Kwangsue Chung , A distributed proxy server system for wireless mobile Web service , Information Networking, 2001. Proceedings. 15th International Conference on , 2001 ,pp: 749 —754
[9] R. Tewari, M. Dahlin ,Vin, H.M. , J.S. Kay, Design considerations for distributed caching on the Internet,Distributed Computing Systems, 1999. Proceedings. 19th IEEE International Conference on ,1999, pp: 273 —284
[10] Anawat Chankhunthod, Michael Schwartz, Peter Danzig, Kurt Worrell , Chuck Neerdaels, A Hierarchical Internet Object Cache, In proc. of USENIX Annual Technical Conference,1995
[11] Evangelos P. MARKATOS ,Catherine E. CHRONAKI, A Top-10 Approach to Prefetching the Web, Technical report, Technical Report No. 173, ICS-FORTH, Heraklion, Crete, Greece, August 1996. URL http://www.ics.forth.gr/proj/arch-vlsi/www.html.
[12] Qiang Yang, Zhen Zhang,Model based predictive prefetching , In Proceedings of the 2nd International Workshop on Management of Information on the Web -- Web Data and Text Mining (MIW''01). September 2001. Munich, Germany; 3-7 September, 2001.
[13] Venkata N. Padmanabhan ,Jeffrey C. Mogul ,Using Predictive Prefetching to improve World Wide Web Latency , Proceedings of the ACM SIGCOMM ''96 Conference,1996
[14] Wesley chan, DealFinder, A Collaborative, Location-Aware Mobile Shopping Application,CHI2001 conference,Dec.8.2000
[15] K. Cheverst, N. Davies, K. Mitchell,A. Friday, C. Efstratiou, Developing a Context-aware Electronic Tourist Guide, Proceedings of CHI 2000, Netherlands, April 2000, pp 17-24
[16] I.Rakkolainen,T.Vainio,A 3D City Info for Mobile Users. Computers &Graphics,Special Issue on Multimedia Applices,Vol.25,No.4.Elsevier 2001.
[17] Davies.N,K. Mitchell,K. Cheverst , and A.Friday , Caches in the Air:Disseminating Tourist Information in the Guide System, In Proc. Of the 2nd IEEE Workshop on Mobile computing System and Application,New Orleans,pp 11-19,1999
[18] Martin Brachtl, J. Slajs, and Pavel Slavik, PDA based navigation system for a 3D environment. IMC2000 workshop on Computers & Graphics, 25(4):627-634, 2000.
[19] P. Biswas, Song Han, Jing Wu , Location caching in the mobile middleware platform ,IEEE Mobile Data Management, 2002. Proceedings. Third International Conference on , 2002
[20] Zhe Xiang, Zhun Zhong, Yuzhuo Zhong, A cache cooperation management for wireless multimedia streaming ,IEEE Info-tech and Info-net, 2001. Proceedings. ICII 2001 - Beijing. 2001 International Conferences on , Volume: 5 , 2001
[21] T.M.Kroeger, Darrell.D.E.Long, Mogul.J.C, Exploring the Bounds of Web Latency Reduction from Caching and Prefetching, In Proc. of USENIX, symposium on Internet Technology and Systems, December 1997
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