博碩士論文 985303016 詳細資訊




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姓名 王哲賢(WANG CHE HSIEN)  查詢紙本館藏   畢業系所 通訊工程學系在職專班
論文名稱 DOCSIS3.0 網路中DBS&DBE 調整策略研究
(DBS and DBE Adjustment Tactics Research of DOCSIS3.0 Networks)
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摘要(中) 在巔峰時間使用網路,容易有大量頻寬的需求而發生負載超重的情形,導致需求頻繁的碰撞而重複發生丟棄的狀況。該如何解決碰撞問題的發生? 就是要頭端能清楚當下網路負載的情況,所以我們利用DOCSIS規範中的另外一個參數競爭窗口(Contention Window)來進行網路負載的預判,當頭端在成功接收需求後,可以區分大多數需求在哪個競爭區間,即可了解當下的網路狀況為何。在清楚網路情況後,就可以開始解決碰撞的問題,因此在本論文內提出兩種方法來進行改善,說明如下:
Propose 1:將視網路情況來執行動態調整競爭窗口與DBS、DBE參數。
Propose 2:利用DOCSIS規範內原有的Null List機制的特性來暫緩部分用戶提出重傳或傳送需求。
綜上所述Propose 1與Propose 2是基本方法,其Propose 1的特點是當發生網路嚴重負載的情形,且有大量需求因無法傳送而被拋棄時,都能有效的解決;而Propose 2則適用在網路中度負載狀態,能在不調整參數的情況下去解決網路壅塞的問題。
我們再以這兩種方法為基礎又另外提出兩種整合方法,以平衡不同效能之表現,說明如下:
整合方法一(Propose 1 Modulated Propose 2):整合Propose 1的有效解決碰撞需求與Propose 2不增加額外網路資源的特性。
整合方法二(Propose 2 With Dynamic Parameters):在Propose 2的方法之中同步去調整競爭窗口與DBS、DBE參數。
結果得出對於較注重系統穩定性的業者可以使用第一種整合方法,以減輕網路壅塞的情形。而第二種整合方法可以提供給追求效率品質的業者使用,既可以保留網路寬頻的情況下,又擁有迅速解決碰撞需求的特性。
摘要(英) Under high traffic network conditions, a large of bandwidth requests may cause collisions to occur frequently. How do we solve this collision problem? That′s to determine the loading conditions of network, so we use one parameter of DOCSIS specification that is ”Contention Window” to determine the conditions of network. When CMTS gets the requests successfully, it could determine the loading of network by the timing of received requests in the contention window. When we understand the conditions, we could solve and improve the collision problem. In this paper, we propose two approaches as below:
Propose 1:Determine the conditions of network to adjust DBS, DBE and Contention Window parameters.
Propose 2:Use the feature of Null List mechanism in DOCSIS specification to pause the transmission request or retransmission request for users.
Propose 1 and Propose 2 are the basic solutions. The propose 1 is able to reduce the collisions for bandwidth request on the heavy loading. The feature of propose 2 is used on the middle loading, it doesn′t adjust the parameters to improve the congestion of network.
Based on above proposal, we provide the two integrated way. They have the different efficacy as follows:
Propose 1 Modulated Propose 2:It combines the propose 1′s feature that reduce the collision for bandwidth request and the propose 2′s feature that doesn′t increase the overhead of network.
Propose 2 With Dynamic Parameters:Adjust DBS, DBE and contention window parameters based on propose 2.
The results show the combined 1 solution is suitable for the MSO that emphasizes stability system to reduce the congestion of network. The combined 2 solutions is suitable for the MSO that emphasizes efficiency system. It could keep the bandwidth of network and solve the collision conditions quickly.
關鍵字(中) ★ DOCSIS
★ CMTS
★ 競爭窗口
★ DBS
★ DBE
★ Null List
關鍵字(英) ★ DOCSIS
★ CMTS
★ Contention Window
★ DBS
★ DBE
★ Null List
論文目次 摘要 ............................................................................................................................. I
ABSTRACT ............................................................................................................................. II
誌謝 ........................................................................................................................... III
目錄 ........................................................................................................................... IV
圖 目 錄 ............................................................................................................................... VI
表 目 錄 ............................................................................................................................. VIII
第一章 緒論 ............................................................................................................................ 1
1-1 研究背景 ........................................................................................................................ 1
1-1-1 研究動機 ................................................................................................................ 1
1-1-2 研究目的 ................................................................................................................ 3
1-2 章節概要 ........................................................................................................................ 4
第二章 研究內容 .................................................................................................................... 5
2-1 DOCSIS簡介 .................................................................................................................... 5
2-2 DOCSIS傳輸架構簡介 .................................................................................................... 6
2-3 DOCSIS網路系統環境架構圖 ........................................................................................ 7
2-4 纜線數據機註冊於CMTS的連線流程 ........................................................................ 7
2-5 Cable Modem 與CMTS的傳輸協議 ............................................................................. 9
2-6 上傳頻寬配置圖之架構 ............................................................................................ 10
2-7 截斷二進制倒退演算法簡介 .................................................................................... 11
2-8 DBS與DBE的參數定義 ............................................................................................ 12
2-9 DOCSIS傳送需求的方式 ............................................................................................ 13
第三章 研究方法 ................................................................................................................ 14
3-1 偵測網路負載輕重情況 ............................................................................................ 15
3-2 建議方法的架構與機制 ............................................................................................ 17
3-2-1 原始方法 ............................................................................................................ 17
3-2-2 建議方法一(Propose 1) ...................................................................................... 21
3-2-3 建議方法二(Propose 2) ...................................................................................... 26
3-2-4 整合方法一(Propose 1 Modulated Propose 2) .................................................. 33
3-2-5 整合方法二(Propose 2 With Dynamic Parameters) .......................................... 35
第四章 模擬結果與分析 .................................................................................................... 38
4-1 Propose 1與Propose 2的模擬結果 ......................................................................... 41
4-2 模擬1000至5000的用戶數 ................................................................................... 44
4-3 兩種整合方式的模擬結果 ....................................................................................... 48
第五章 結論與未來展望 .................................................................................................... 51
5-1 結論 ............................................................................................................................ 51
5-2 未來展望 .................................................................................................................... 53
參考文獻 .............................................................................................................................. 54
參考文獻 [1] ISPreview,”World Broadband Users Hit 643.7 Million Fuelled by Fibre Optic Connectivity”,[online],Jan 17, 2015,From:http://www.ispreview.co.uk/index.php/2013/04/world-broadband-users-reach-643-7-million-fuelled-by-fibre-optic-connectivity.html
[2] Point Topic, Tim Johnson, “Reviewing USA statistics,09 Apr 2014”,[online],Dec 23, 2014,From:
http://subscribers.point-topic.com/Posts/reviewing-usa-statistics
[3] Cable Television Laboratories, Inc.,”Data-Over-Cable Service Interface Specifications DOCSIS 3.0,MAC and Upper Layer Protocols Interface Specification”,CM-SP-MULPIv3.0-I25-140729.
[4] Cable Television Laboratories, Inc.,”DOCSIS Specifications Library”,[online]. Nov 21, 2014,From:http://www.cablelabs.com/specs/#tabs-695.
[5] Wikipedia,”DOCSIS,History”,[Online],Nov 21, 2014,From:
http://en.wikipedia.org/wiki/DOCSIS
[6] Cable Television Laboratories, Inc.,”Data-Over-Cable Service Interface Specifications DOCSIS 3.0,Cable Modem to Customer Premise Equipment Interface Specification,CM-SP-CMCIv3.0-I02-140729.
[7] Cable Television Laboratories, Inc.,” Data-Over-Cable Service Interface Specifications DOCSIS 2.0,Radio Frequency Interface Specification”,CM-SP-RFIv2.0-I13-080215.
[8] Wei-Tsong Lee, Kun-Chen Chung, Kuo-Chih Chu, and Jen-Yi Pan,”DOCSIS Performance Analysis Under High Traffic Conditions in the HFC Networks”,IEEETRANSACTIONS ON BROADCASTING, VOL. 52, NO. 1, March 2006
[9] Kai-Chien Chang and Wanjiun Liao,“The Contention Behavior of DOCSIS in CATV Network”,IEEE TRANSACTIONS ON BROADCASTING, VOL. 53, NO. 3,SEPTEMBER 2007
[10] Cisco, Inc. ” What is the Maximum Number of Users per CMTS?”,[online]。Oct 28,2014,From:http://www.cisco.com/c/en/us/tech/broadband-cable/cable-modem-termination-systems-cmts/index.html
指導教授 陳彥文(Yen Wen Chen) 審核日期 2015-1-23
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