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  4. 寬頻網際網路服務品質保證(III)─子計畫三:寬頻網際網路中以量測為基礎的訊務控制與動態資源分配之研究與實作
 
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寬頻網際網路服務品質保證(III)─子計畫三:寬頻網際網路中以量測為基礎的訊務控制與動態資源分配之研究與實作

Date Issued
2001
Date
2001
Author(s)
孫雅麗  
DOI
892219E002024
URI
http://ntur.lib.ntu.edu.tw//handle/246246/18815
Abstract
Many real-time applications are capable of adapting their transmission to the network state and can as well tolerate occasional delay bound violations in the presence of transient network congestion. For this type of applications, an absolutely reliable bound on packet delivery times is not required. Moreover, many non-real-time applications such as on-line transaction processing and distributed simulation would desire a congestion-free packet delivery service from the network. This new type of service is called “Congestion-Free Service” with the guarantee of a maximum packet loss rate. This work considers resource allocation in the support of “Congestion- Free Service” in Broadband Internet. First, we studied traffic characterization under different measurement models via analyzing traffic traces collected from National Taiwan University campus network. The preliminary results show that traffic load can be approximated by the Normal distribution. In the second part of the work, we proposed a dynamic bandwidth and queue management scheme to support “Congestion-Free Service.” To better understand the characteristics of the broadband Internet, we have developed a tool called AppMeasure which provides three sets of service: IPFlow, AnyTrace, and AppFlow. IPFlow provides on-line tracking and reporting of individual IP flows. In AnyTrace, user can specify the number of bytes of a packet to trace. It serves as a measurement base to enable all-layer traffic accounting and analysis, and differentiated charging based on Quality of Service. Appflow tracks and reports any type of traffic specified by the user . It aims to integrate with policy-based QoS service.
Subjects
congestion-free
packet loss rate
traffic measurement
measurement window
bandwidth allocation
buffer management
Publisher
臺北市:國立臺灣大學資訊管理學系暨研究所
Type
other
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