| 姓名 |
謝育錚(Yu-Chen Hsieh)
查詢紙本館藏 |
畢業系所 |
通訊工程學系在職專班 |
| 論文名稱 |
同軸纜線多媒體聯盟(MoCA)協定服務品質之效能研究
(The analysis of QoS performance of MoCA)
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| 相關論文 | |
| 檔案 |
 [Endnote RIS 格式]
[Bibtex 格式]
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| 摘要(中) |
在各種家庭網路協定中,同軸纜線多媒體聯盟(MoCA)協定是利用原有家中
同軸纜線線路的一種家庭網路協定.目標是期望在一般家庭裡能提供高速與方便
安裝的家用網路,以供家中可藉由網路分享資源的3C設備使用.而從媒體存取層
來看,相較於其他的家庭網路協定, MoCA的網路存取控制上所採用的方法有明顯
的不同.其他的協定(such as HomePlug and HomePNA)在網路存取上使用了競爭
式存取與免競爭式存取.而競爭式的存取方式多使用在優先權式的品質服務上,
因此必須搭配CSMA/CD和backoff的機制來避免於於各個node於同一時間來存取
網路,進而產生封包碰撞的情況.而MoCA協定在網路存取上,由NC (network
coordinator)來個別分配,即設備在傳送資料前皆必須取得NC所分配的傳送時間.
所以理論上MoCA不會有封包碰撞產生的機會.
在服務品質方面,同軸纜線多媒體聯盟協定協定定義了兩種服務品質的方法,
一為優先等級式服務品質(prioritized QoS)和參數式服務品質(parameterized QoS).
對於prioritized QoS,為對於接收到的乙太網路封包,依封包所擁有802.1p的優先
順序位元,來分類對應至所屬的優先等級的佇列. 接著,MoCA端點便會依其各
個優先等級的佇列內所存的資料長度,提出存取要求.NC在收到所有的端點的存
取要求後,便依據要求所屬的優先等級,傳送點,與接收點等訊息來分配頻寬至下
一次的網路存取所屬的MAP訊框裡.之後,各個node依據MAP的timeslot的分配
來傳送不同priority的訊框.
因為MoCA網路存取都必須取得NC分配的網路存取時間,所以NC的排程器
所使用的頻寬分配機制與對不同priority的訊框所採取的policy,對於網路的效
能有著十分直接的影響.在本論文中,所研究的服務品質類別,為優先等級式服務
品質的方式. 而NC上,我們會使用在排程上廣泛被使用的weighted fair queue與
round robin的方法,在搭配在queue裡使用”分配頻寬較少者優先的方法”來決
定每回的分配頻寬的大小與順序.而模擬會假設一般的家庭網路的場景來設定不
同的各等級封包量的大小,來收集傳輸流量,延遲性和封包遺失率等資料. 最後
會依據得到的模擬資料,說明其等級式服務品質在MoCA環境裡的優缺點.
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| 摘要(英) |
Among of various home network protocols, the MoCA takes advantage of
original coxial cable wring in home. Its target is that easily buildup a high speed home
network without new wring, aned offers all 3C consumer devices to connect each
other and access to internet. From the viewpoint of MAC layer of MoCA, its access
way is different than other home network protocols, such as HomePNA and
HomePlug, which use competition access for priority base QoS and non-competition
access for parameter base QoS. Regarding to the way of competition access, it must
work with CSMA/CD and back off mechanism to avoid packet collosion occurring.
On network access, the MoCA needs a device calls “network coordinator” to allocate
channel bandwidth to all nodes according to their bandwidth requests, therefore,
theoretically,no collision takes place.
The MoCA defines two kind of QoS, one is prioritized QoS and another one is
parameterized QoS.To approach prioritized QoS, first ,the node devices have to
classify received packet in accordance with its 802.1p tag, then place it into its
belonged priority queue. Next, all nodes sends out the reservation request to network
coordinator to request channel access time. After collecting all reservation requests
from all nodes, NC will allocate bandwidth on MAP of next map cycle.
Due to that MoCA is a fully scheduling network and all network access are
central controlled by NC, the way of packet sheduling on NC is high correlative to its
network efficiency. On this thesis, we docus on the prioritized QoS on MoCA. On
scheduler design, we adopt most popular packet data scheduling technique – “round
robin and weighted fare queue” as core mechanism on NC. Regarding to each priority
quque on NC, we proposal a method names “lowest allocated bandwidth record first
out” to decide reservation elements order within the queue and use dual threshold to
control delay. In order to analysis our proposal, our simulation will collect the
throughout, packet delay and packet loss to evaluate scheduler performance. On
summary chapter, we summarize the advantages and disadvantages of our proposal as
well as prioritized QoS arrording to our simulation result.
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| 關鍵字(中) |
★ 延遲性.
★ 排程
★ QoS
★ MoCA |
關鍵字(英) |
★ Delay.
★ scheduling
★ QoS
★ MoCA |
| 論文目次 |
第一章 緒論....................................................... 1
1.1 前言...................................................................................................................1
1.2 研究動機...........................................................................................................2
1.3 論文架構...........................................................................................................3
第二章 相關研究................................................... 4
2.1 MoCA協定技術基本介紹..................................................................................4
2.2 實體層的簡介.................................................................................................10
2.3 MAP網路存取計劃與頻寬分配管理的介紹..................................................16
2.4 MoCA協定裡所提供的服務品質保證............................................................26
2.5 Weighted Fair Queue (WFQ) .......................................................................30
第三章 排程演算法................................................ 31
第四章 模擬與分析................................................ 41
4.1模擬環境介紹..................................................................................................41
4.2 模擬環境參數設定.........................................................................................43
第五章結論與未來研究........................................ 159
參考文獻........................................................ 160
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| 參考文獻 |
[1] Multimedia over coax Alliance,“MoCA MAC/PHY SPECIFICATION v1.0
”, April 2007.
[2] Multimedia over coax Alliance,“MoCA MAC/PHY SPECIFICATION v1.1
EXTENSIONS”, Sep 2008.
[3] Powerline Alliance,“HomePlug AV specification version 1.1”, May 2007.
[4] IEEE Standard, “IEEE Standard for Local and metropolitan area networks Virtual
Bridged Local Area Networks: 802.1Q” December 2005.
[5] Weight fair queue, “http://en.wikipedia.org/wiki/Weighted_fair_queue”.
[6] Walter Ciciora,James Farmer, David Large “Modern Cable Television
Technology”Morgan Kaufmann.
[7] Hung-Ying, Tyan ,“Design, realization and revolution of a component-based
compositional software architecture for network simulation” The Ohio State
University, 2002.
[8] Anton Monk, Stephen Palm, Al Garrett, Ron Lee, Tom Leacock “MoCA
protocol.pdf”, http://www.mocalliance.org, Nov 2007.
[9] http://www.mocalliance.org, “MoCA_2_0_presentation.pdf”, Jun 2010.
[10] Thomas D. Lagkas, Georgios I. Papadimitriou,”Priority-Oriented Adaptive
Control With QoS Guarantee for Wireless LANs”, July 2007
[11] S. Mangold, S. Choi, G. Hiertz, O. Klein, and B. Walke, “Analysis of IEEE
802.11e for QoS support in wireless LANs”, Dec. 2003.
[12] Guoliang Liu ,Shanquan Zhou, Xi Zhou ,Xin Huang “QoS Management in
Home Network”, 2006.
[13] Amina Al-Sawaai , Irfan Awan ,Rod Fretwell “Analysis of the Weighted Fair
Queuing System with Two Classes of Customers with Finite Buffer”, 2009.
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| 指導教授 |
陳彥文(Yan-Wen Chen)
|
審核日期 |
2010-7-25 |
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