Transcript TSACC Test Area - 한국정보통신기술협회(TTA)

GSC9/GTSC_020Rev1
SOURCE:
ITU-T
TITLE:
End to end Quality of Service; Where we are, Perspectives
AGENDA ITEM:
GTSC; 5.2
CONTACT:
Jean-Yves Monfort (ITU-T SG 12 Chairman)
France Telecom, R&D Division
22307 Lannion
France
[email protected]
End-to-End Quality of service
in ITU-T
Where we are, Perspectives
Jean-Yves Monfort
France Telecom, R&D Division
ITU-T SG 12 Chairman
16/07/2015
GSC-9, Seoul
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Messages on QoS and Interoperability from the CTO's meeting
organized by TSB Director (décember 2003)
http://www.itu.int/ITU-T/tsb-director/cto/index.html
- ITU-T should ensure global interoperability.
(Similar conclusions were raised in several other workshops (e.g. ehealth, TDR,…).
- Mechanisms to provide end-to-end QoS are required,
including
- MPLS based QoS
- Session based QoS
- QoS Classes or High quality classes.
- Interoperability for all major services required on a global
scale and interoperability for the required core middleware
functionalities
- Simplicity and ease of use for the end users , QoS
determined by user choice of service, and high quality for voice (e.g.
wideband)
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Challenges for QoS
Statements/Conclusions of ITU-T Workshop on QoS – Oct 2003
http://www.itu.int/ITU-T/worksem/qos/index.html
• "Need
for interworking standards to achieve end to end QoS"
• "Need for a common understanding and implementation of QoS classes"
•"Generic requirements for IP QoS and traffic signalling being developed
in ITU-T SG 11(and on-going activities in Q.EE/11) –
TRQ.IPQOS.SIG.CS1(Y.1541/Y.1221 specifications are being applied, Dynamic QoS
apportionment will be supported) and related work is under way in IETF/NSIS, but
work is still needed to enable implementation of QoS control-based
networks."
• "Need to define the specific signalling system(s) to be used to
implement assured QoS in IP-based networks, because several candidate
systems exist and have strong proponents.
The alternatives are a broad consensus, or
many gateways to be needed.
Need for collaborations/cooperations."
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Challenges for QoS
Statements/Conclusions of ITU-T Workshop on QoS – Oct 2003
•"More work needed to understand the relationship between Service Level
Specification, monitoring and application monitoring"
•"Ultimately the issue for accelerating deployment of QoS that fully supports the user
experience is capital, which these days is only made available when persuasive business
cases have been made "
A general remark, but well adapted to QoS
To ensure IP QoS interoperability it is needed to :
- ensure a high level leading role
- have experts from each relevant (standardisation) bodies working together, to
understand each other aims, working methods, process and to work with coherent
schedules
- ensure that the areas of work in progress are in line with the guidelines in the
relevant bodies
- have the relevant support of the experts of a company, working in the different
bodies.
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On –going work on QoS architecture
-JRG-NGN, and Question D/13 are developping several Recommendations (see
also annex 1)
Recommendation Y.1291 (Y.qosar) "An architectural framework for support of
Quality of Service (QoS) in Packet networks
This Recommendation, approved in early may, could be used as a basis
that could be used as a common basis.
Draft Rec. Y.e2eqos "A QoS Architecture for IP/MPLS Networks"
Draft Recommendation Y. 123.qos "A QoS Architecture for Ethernet-Based IP
Access Network"
It is a basis to specifiy a layered reference model and methods for support of QoS in
Ethernet-based IP access network and associated protocol requirements.
Other activities planned in particular in Q. D/13 (Requirements and framework
for QoS for NGN) : QoS mechanisms end to end, Study of QoS enablers and QoS
architectures that integrate QoS enablers, What new Recommendations to support
QoS in packet access network?, …
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Other important topics related to QoS (on –going activities)
- Quality assesment methodologies for multimedia
services
On-going work under a JRG Multimedia assessment
(for opinion models, psychoacoustic models and models
associated to INMD).
Note that for voice, INMD Recommendations
(P.561/P.562) have been recently updated for Class D
equipments (to take into account the new network interfaces
using packet mode transmission).
-The need consider also the user point of view : it means that
the technical parameters need to be correlated to user
perception/expectations (follow-up actions based on G.1000,
G.1010, E.QoSparam,…), for all kinds of services.
Recommendations under development : G.MMPerf, G.Webperf
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Other important topics related to QoS (on –going activities)
- Handbook on QoS will be available soon (prepared by
WP2/2)
- On-going work on network performance:
- Ethernet (Y.ethperf)
- Hybrid networks (Y.hybperf)
Note that other relevant recommendations have
been approved recently :
- Y.1561: Performance and availability parameters for
MPLS networks (may 2004)
- Y.1560: TCP performance parameters and objectives
(september 2003)
-QoS Interoperability : A new question Q.K/12.
- Transmission performanceGSC-9,
(including
NGN) Q.J/12
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Perspectives/actions for NGN QoS
-Classes of services
- Need to harmonize ITU-T QoS classes and 3 GPP TS 23.107 to permit a
mapping. Better convergence needed. A good approach of these issues and
possible solutions being documented by MM Wohlert and Seitz (see COM13D53cor1).
- On-going work to "concatenate" QoS values in multinetwork conditions.
- QoS Control (Some terminals are able to control QoS, some are not)
-Different QoS mechanisms corresponding to different technologies (xDSL-Type"
and "3GPP-Type"
- A basis available in packet cable environment (to be considered more largely?).
- QoS architecture (see annex 1 on on-going work onQoS archtecture in JRG NGN)
- Qos control signalling based on already defined protocols (e.g. RSVP, COPS,
NSIS,…)
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Annex 1
Complements : Recommendations under development
in JRG-NGN
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Works on NGN QoS Architecture in ITU-T (see also GSC9-GTSC-009)
M
Pl an
an ag
e em
en
t
JRG NGN work on Recommendation
Rec Y.1291 (May 2004) "An architectural framework for support of
Quality of Service (QoS) in Packet networks
This Recommendation could be used as a basis for the different standard
bodies.
It defines a set of generic mechanisms for controlling the network service
response to a service request, and the three logical planes (Control,
Management, Data)
Metering
Admission
Control
QOS
Routing
Resource
Reservation
Service
Restoration
Control Plane
Data Plane
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Policy
Buffer
Management
Congestion
Avoidance
Traffic
Shaping
Traffic
Policing
Packet
Marking
Queuing &
Scheduling
Service
Level
Agreement
Traffic
Classification
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On-going Work on NGN QoS Architecture in ITU-T in ITU-T
JRG NGN work on Recommendations
Draft Rec. Y.e2eqos "A QoS Architecture for IP/MPLS Networks"
- Support flexibility billing and business Model
- Interface and signalling between service control layer and transport
resource control layer
- Cover the inter-domain QoS control cas between different operators
- Cover the connectionless services
- Support mobility.
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On –going work on QoS Architecture in ITU-T
JRG NGN work on Recommendations
Y. 123.qos A QoS Architecture for Ethernet-Based IP Access Network
It is a basis to specifiy a layered reference model and methods for support of
QoS in Ethernet-based IP access network and associated protocol
requirements.
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