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)
DOI
892219E002024
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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