implementing cisco quality of service qos
Quality of Service in IP Networks
Ngày tải lên :
06/04/2013, 11:05
... eg. ToS field of IP
o Problem
l how to avoid everybody sendinghigh priority packets?
Queue Management
1
Quality of Service in IP
Networks
CH-1015 Ecublens
http://icawww.epfl.ch
Prof. Jean-Yves ... Fast Retransmit
o Probability p of choosing a given flow is proportional to the rate of the
flow
l more packets of that flow, higher probability of choosing one of its packets
Queue Management
16
FIFO
o ... assurance for QOS
o Work in Progress includes Differentiated Services, and Integrated
Services (RSVP)
o Simple model
for sharing and
congestion
studies:
Queue Management
24
RED
o Estimation of the...
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Quality of Service
Ngày tải lên :
30/09/2013, 05:20
... information instead of when a packet arrives. The
140
Chapter 9. Quality of Service
Quality of service (QoS) is an often-used and misused term that has a variety of meanings. In this book, QoS
refers ...
functions to achieve the best QoS possible.
Cisco offers many tools for implementing QoS. In some scenarios, you can use none of these QoS tools and
still achieve the QoS you need for your applications. ... both edge QoS and backbone QoS must work together to achieve the proper QoS
for the various applications which might be traversing a network.
Before implementing QoS on the edge of a network,...
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Tài liệu New Network Architecture Digivance® Simulcast Networks Reduce Network Costs and Improve Quality of Service ppt
Ngày tải lên :
10/12/2013, 19:15
... or
more of the total number of RF channels required on a
multiple link transport system for a specified amount of
user grade of service. The percentage reduction
depended on the number of radiating ...
5
A
N
N!
B=
i
i!
i=0
N
A
∑
Improving Grade of Service (GOS) While
Reducing RF Channels
Wireless service providers are adopting new deployment strategies
to reduce network costs and improve quality of service. In one
urban ... “grade of service (GOS), which is the
acceptable amount of network blocking of incoming call
attempts. Typical wireless network designs in the United
States provision channels to provide voice services...
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Tài liệu Infrastructure Quality of Service pptx
Ngày tải lên :
11/12/2013, 14:15
... Service
Signaling
Quality of Service
Signaling
© 2000, Cisco Systems, Inc. www .cisco. com econ_0386_09_001.ppt
Copyright © 2000, Cisco Systems, Inc. 40
© 2000, Cisco Systems, Inc. www .cisco. com econ_0386_09_010.ppt
Keep ... configuring Layer 2 QoS in switches that are capable of doing QoS, see the following
URL: http://www .cisco. com/univercd/cc/td/doc/product/lan/cat6000/sw_5_2/cofigide /qos. htm
Copyright © 2000, Cisco Systems, ... the service policy named gary.
http://www .cisco. com/univercd/cc/td/doc/product/software/ios120/120newft/120limit/120xe/120xe5/mqc/mcli.htm
Copyright © 2000, Cisco Systems, Inc. 44
Quality of Service
Signaling
Quality...
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Tài liệu Introduction to Quality of Service pdf
Ngày tải lên :
11/12/2013, 14:15
... significance of Quality of Service (QoS)
• Describe new Quality of Service (QoS) features in
Cisco IOS 12.1
• Explain which problems QoS solves
The purpose of this module is to quickly survey the new Quality ... Inc. 1
© 2000, Cisco Systems, Inc.
Introduction to
Quality of Service
Introduction to
Quality of Service
Copyright © 2000, Cisco Systems, Inc. 20
© 2000, Cisco Systems, Inc. www .cisco. com Econ_0385_02_010.ppt
Keep ... significance of QoS
• Describe new QoS features in Cisco IOS 12.1
• Explain which problems they solve
Internal Cisco links on QoS:
See:
http://wwwin-people .cisco. com/emar /qos. html
http://wwwin-emea .cisco. com/FieldInfo/Consult/Tech/Core /QOS/ fol17487/S1.htm
Copyright...
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Tài liệu Campus Quality of Service pdf
Ngày tải lên :
11/12/2013, 14:15
...
differentiator in achieving QoS.
© 2000, Cisco Systems, Inc. 1
© 2000, Cisco Systems, Inc.
Campus
Quality of Service
© 2000, Cisco Systems, Inc. 17
© 2000, Cisco Systems, Inc. www .cisco. com econ_387_05_010.ppt
Campus ... Differential Service Code Point
The objective of this module is to define the quality of service (QoS) tools which must be
implemented to provide a voice-enabled transport service for IP telephony.
A QoS- enabled ... achieved end-to-end QoS.
© 2000, Cisco Systems, Inc. 6
© 2000, Cisco Systems, Inc. www .cisco. com econ_387_05_010.ppt
Steps for Campus QoS
Steps for Campus QoS
2 Steps for Campus QoS Implementation
•...
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Chapter 24 Congestion Control and Quality of Service pdf
Ngày tải lên :
06/03/2014, 12:20
... avoidance, additive increase
24.23
24-5 QUALITY OF SERVICE
24-5 QUALITY OF SERVICE
Quality of service (QoS) is an internetworking issue
Quality of service (QoS) is an internetworking issue
that ... provide quality of
Two models have been designed to provide quality of
service in the Internet: Integrated Services and
service in the Internet: Integrated Services and
Differentiated Services. ... Four cases of congestion
24.2
24-1 DATA TRAFFIC
24-1 DATA TRAFFIC
The main focus of congestion control and quality of
The main focus of congestion control and quality of
service is
service is...
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security & quality of service in ad hoc wireless networks
Ngày tải lên :
25/03/2014, 12:07
... 105
5.9 References 106
6 Quality of service 107
6.1 Introduction 107
6.2 Routing in mobile ad hoc networks 110
6.3 Routing with quality of service constraints 112
6.4 Quality of service routing in ... associated with providing quality of service (QoS) in
ad hoc networks. It should be pointed out that security and quality of service
are two distinct attributes that are independent of each other in general. ... potential sources of
service impairment in ad hoc networks and hence may degrade the ‘ quality of
service ’ seen by the users. As of now, the Internet has only supported ‘‘best
effort’’ service – best...
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Báo cáo hóa học: " Quality of service implications of power control and multiuser detection-based cross-layer design" docx
Ngày tải lên :
21/06/2014, 03:20
... rate; PBOA: Progressive
Backoff Algorithm; PHY: physical layer; QoS: quality of service; SINR: signal-to-
interference-and-noise-ratio.
Author details
1
Institute of Communication Networks, Technische ... assess and
compare the QoS of both schemes by means of exten-
sive system simulations in terms of data throughput as
well as delay. However, we also consider the fairness of
both schemes as an ... 2011, 2011:9
http://jwcn.eurasipjournals.com/content/2011/1/9
Page 7 of 13
RESEARCH Open Access
Quality of service implications of power control
and multiuser detection-based cross-layer design
Ulrike...
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Quality of Service and Resource Allocation in WiMAXFig Part 1 pdf
Ngày tải lên :
21/06/2014, 05:20
... dequeued and the value of the (DC_i) is
decremented by L_i. The algorithm is flexible enough as it allows provision of quantum of
different sizes depending on the QoS requirements of the SSs. However, ... associated with a service class. The
IEEE 802.16 standards define five service classes: Unsolicited Grant Service (UGS), extended
real-time Polling Service (ertPS), real-time Polling Service (rtPS), ... Section
Quality of Service and Resource Allocation in WiMAX
4
3. Then, the performance evaluation of these algorithms is made. Section 5 presents a
synthesis table of the main scheduling...
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Quality of Service and Resource Allocation in WiMAXFig Part 5 pdf
Ngày tải lên :
21/06/2014, 05:20
... perform scheduling services, so
that the QoS requirements of the connections can be satisfied.
3.1 What is QoS?
QoS refers to the ability of a network to provide improved service to selected ... of a cellular WiMAX network where a
number of base stations need to communicate simultaneously with their respective active
users
1
. Each of these u sers has typically a certain Quality of Service ...
wireless-based access methods.
3.2 QoS and scheduling in WiMAX
A high level of QoS and scheduling support is one of the interesting features of the WiMAX
standard. These service- provider features are...
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Quality of Service and Resource Allocation in WiMAXFig Part 6 pot
Ngày tải lên :
21/06/2014, 05:20
... analysis of the network in the limit of large number of users.Theaimof
this approach is to obtain op timal values of the resuse factor that no longer depend on the
particular configuration of the ... IEEE802.11e enhancement (IEEE802.16e, 2006), that allows
the quality- of- service management.
Service and performance metric. The main objective of this chapter is to derive and compare
the performance ... the knowledge of t he
signal -quality, the amount of users, the scheduling policy, etc. This entails that in the case of
UE initiated connections, the UE has a complete knowledge of the expected...
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Quality of Service and Resource Allocation in WiMAXFig Part 7 doc
Ngày tải lên :
21/06/2014, 05:20
... defines a
concept of a service flow. A service flow is a unidirectional flow of packets with a particular
set of QoS parameters and is identified by a service flow identifier (SFID). The QoS parameters
could ... format of the OFDMA slot is 8 data subcarriers
of 6 OFDM symbols. The total number of OFDMA slots in a mobile WiMAX frame
corresponds to S
× T
s
where S =
L
d
8
and T
s
is the number of OFDM symbol ... satisfy
QoS constraints of each connection. The mapping mechanism is left to the choice of the
provider.
3. State of the art
3.1 Bandwidth sharing strategies: background
To maintain a quality of service...
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Quality of Service and Resource Allocation in WiMAXFig Part 8 ppt
Ngày tải lên :
21/06/2014, 05:20
... studying the impact of different parameters on the
performance of contention-based services of IEEE 802.16.
We evaluate the impact of the number of SSs (N) and the initial backoff window (W)on
various ... PMP mode.
In WiMAX networks, quality of service (QoS) is provided through five different services
classes in the MAC layer (Andrews et al., 2007):
1. Unsolicited grant service (UGS) is designed for ... traffic load of an SS, ρ. In the following, we will develop the outer set of fixed point
equations for ρ.
3.2 Mean service time of an REQ
This subsection presents the details of Block B of Fig. 2,...
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Quality of Service and Resource Allocation in WiMAXFig Part 9 docx
Ngày tải lên :
21/06/2014, 05:20
... providers.
With regard to Quality of Service (QoS) control, the WiMAX system provides service
differentiation based on the combination of a set of communication service classes
supported by ... “http://www.tkn.tu-berlin.de/research/evalvid/”
Quality of Service and Resource Allocation in WiMAX
200
After the process of classification has been completed,, the most complex aspect of the
provision of QoS to individual ... reduction in the quality of the
video. Figure 13 compares the number of frames received for each situation.
Fig. 13. Number of Decoded Frames
As well as the QoS analysis of the handover...
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