Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/4904
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dc.contributor吳國光zh_TW
dc.contributor.author李承寰zh_TW
dc.contributor.authorLi, cheng-huanen_US
dc.contributor.other通訊工程研究所zh_TW
dc.date2013en_US
dc.date.accessioned2014-06-06T06:30:30Z-
dc.date.available2014-06-06T06:30:30Z-
dc.identifierU0005-1508201323442900en_US
dc.identifier.citation[1] Haitao Wu, Kun Tan, Yongguang Zhang, “Proactive Scan: Fast Handoff with Smart Triggers for 802.11 Wireless LAN”, INFOCOM 2007. 26th IEEE International Conference on Computer Communications. IEEE, 749-757, 2007 [2] Ishwar Ramani, Stefan Savage, “SyncScan: Practical Fast Handoff for 802.11 Infrastructure Networks”, INFOCOM 2005. 24th Annual Joint Conference of the IEEE Computer and Communications Societies. Proceedings IEEE vol. 1, 675-684, 2005 [3] Xi Chen, Daji Qiao, “HaND: Fast Handoff with Null Dwell Time for IEEE 802.11 Networks”, INFOCOM, 2010 Proceedings IEEE, 1-9, 2010 [4] Sangheon Pack, Jaeyoung Choi, “Fast Handoff Support in IEEE 802.11 Wireless Networks”, First Quarter 2007, 2-12, 2007 [5] German Castignani1, Nicolas Montavont, “IEEE 802.11 Scanning Algorithms: Cross-Layer Experiments”, Computer Science/Networking and Telecommunication, 1-21, 2011 [6] Ashish Sharma, Elizabeth M. Belding, “Congestion-Aware Rate Adaptation in Wireless Networks: A Measurement-Driven Approach”, Sensor, Mesh and Ad Hoc Communications and Networks, 2008. SECON ''08. 5th Annual IEEE Communications Society Conference on, 1-9, 2008 [7] George Athanasiou, Ioannis Broustis, “LAC: Load-Aware Channel Selection in 802.11 WLANs”, Personal, Indoor and Mobile Radio Communications, 2008. PIMRC 2008. IEEE 19th International Symposium on, 1-6, 2008 [8] A.R. Rebai, M. Fliss Rebai, “An Enhanced Heuristic Technique for AP selection in 802.11 Handoff procedure”, IEEE 17th International Conference on, 576-580, 2010 [9] Jae-wook Jang, Yeon-sup Lim, “Traffic-aware Decentralized AP Selection for Multi-Rate in WLANs”, 12th International Conference on Advanced Communication Technology, 278-283, 2010 [10] S. Vasudevan, K. Papagiannaki, “Facilitating Access Point Selection in IEEE 802.11 Wireless Networks”, the 5th ACM SIGCOMM conference on Internet Measurement, 293-298, 2008 [11] Arunesh Mishra, Minho Shin, “An Empirical Analysis of the IEEE 802.11 MAC Layer Handoff Process”, ACM SIGCOMM Computer Communication Review Volume 33 Issue 2, 93-102, 2003 [12] Mohit Saxena, Puneet Gupta, “Experimental Analysis of RSSI-based Location Estimation in Wireless Sensor Networks”, Institute of Electrical and Electronics Engineers, 503 - 510, 2008 [13] http://flylib.com/books/en/2.519.1.35/1/en_US
dc.identifier.urihttp://hdl.handle.net/11455/4904-
dc.description.abstract隨著IEEE 802.11的制定與無線傳輸技術的快速發展,無線區域網路已成為行動通訊世界中的一個重要成員,由於具備低成本及易建置性等特性,無線區域網路的應用也日益普及。要達成不間斷的傳輸服務,換手(handover)機制必須通常地設計。然而在目前的換手機制中,需要完整地掃描(scan)周遭的通道,造成過長的掃描延遲,對於即時性的應用有嚴重的影響。除此之外,標準中制定的換手機制是依據訊號強度(RSSI)來選擇換手存取點(access point),忽略了考慮通道擁塞情形的因素,可能切換到的AP無法提供足夠的傳輸率,因此在本篇論文中,我們將探測請求(probe request)訊框與探測回應(probe response)訊框交換的時間差所提供的資訊,來判斷換手AP忙碌的程度,並調整掃描機制中的通道停留時間,來縮短掃描所花費的時間,以有效的解決目前換手機制中的缺失。我們並將本篇論文所提出的方法,實作於目前無線網卡驅動程式中,以驗證其在換手機制上的效能。zh_TW
dc.description.abstractWith the announcement of IEEE 802.11 standards and the rapid development of the wireless transmission technology, WLANs (wireless local area networks) have become popular due to its low cost and being easy to set up. To achieve an uninterrupted transmission service, handover mechanisms must be carefully designed. However, current handover mechanisms require completely scanning surrounding channels which can result in long scanning delays and thus severely affect the performance of real-time applications. Apart from this, the handover mechanism in the standard specification chooses the new access point (AP) based only on the information of the received signal strength (RSSI). Since the congestion condition on the new AP is not considered in the selection process, the new AP may not it support the required enough transmission rate if it is heavily loaded. In this thesis, we propose to use the information of the round-trip delay between the probe request and the probe response for handover AP selection. Furthermore, the duration of scanning on a specific channel will be properly designed to reduce the scanning delay. We have verified the proposed method through implementation on the driver of the wireless network card. The experiment results show that the proposed method outperforms the standard mechanism on the handover performance.en_US
dc.description.tableofcontents摘要------------------------------------------------------i Abstract-------------------------------------------------ii 目錄----------------------------------------------------iii 表目錄---------------------------------------------------iv 圖目錄----------------------------------------------------vi 第一章 序論-----------------------------------------------1 1.1 前言-----------------------------------------------1 1.2 動機-----------------------------------------------1 1.3 論文架構-------------------------------------------2 第二章 相關背景研究---------------------------------------4 2.1 IEEE 802.11標準介紹-------------------------------4 2.2 相關文獻探討---------------------------------------8 第三章 與802.11標準相容之換手機制設計--------------------16 3.1 新的快速掃瞄機制之設計----------------------------16 3.2 新的AP選擇機制之設計-----------------------------17 3.3 利用雙掃描序列之換手機制流程----------------------19 第四章 實驗結果與分析------------------------------------23 4.1 實驗環境與工具------------------------------------23 4.2 802.11 掃描與換手機制的實驗分析-------------------23 4.3 通道擁塞判斷式------------------------------------35 4.4 方法比較------------------------------------------39 第五章 結論與未來研究-------------------------------------42 參考文獻-----------------------------------------------------43zh_TW
dc.language.isozh_TWen_US
dc.publisher通訊工程研究所zh_TW
dc.relation.urihttp://www.airitilibrary.com/Publication/alDetailedMesh1?DocID=U0005-1508201323442900en_US
dc.subject802.11zh_TW
dc.subject802.11en_US
dc.subject換手機制zh_TW
dc.subject掃描zh_TW
dc.subjectAP選擇zh_TW
dc.subjecthandoveren_US
dc.subjectscanen_US
dc.subjectAP selectionen_US
dc.title與802.11標準相容之換手機制設計- 結合無線存取點選擇與縮短換手延遲zh_TW
dc.titleA handoff mechanism design compatible with 802.11 standards - combined with the wireless access point selection and the handoff latency reductionen_US
dc.typeThesis and Dissertationzh_TW
item.openairecristypehttp://purl.org/coar/resource_type/c_18cf-
item.openairetypeThesis and Dissertation-
item.cerifentitytypePublications-
item.fulltextno fulltext-
item.languageiso639-1zh_TW-
item.grantfulltextnone-
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