Joint Session
ACHIEVING MULTIMEDIA QOS OVER
HYBRID IP/PSTN INFRASTRUCTURES
Session Co-Chairs:
Neal Seitz – Vice Chair, SG 13; Chair, WP 4/13
(Network Performance and Resource Management)
Federico Tosco – Vice Chair, SG 16; Chair, WP 2/16
(Multimedia Platform and Interworking)
INDUSTRY GOALS
• Define QOS requirements for real-time services
(e.g., signal delay, fidelity, service availability)
• Implement real-time QOS mechanisms in networks
(e.g., traffic control, resource allocation)
• Implement QOS signalling among network providers
(e.g., H.248/MEGACO, BICC)
PANELISTS AND TOPICS
Helmut Schink (TIPHON) – VoIP QOS requirements
Les Cottrell (SLAC) – ESnet user QOS measurements
Chuck Dvorak (SG 12) – ITU-T QOS responsibilities
Susumu Yoneda (SG 13) – IP traffic / congestion control
Mike Buckley (SG 16) – Multimedia QOS signalling
Tom Taylor (IETF) – Media gateway control standards
Greg Ratta (SG 11) – BICC signalling standards
SESSION PLAN
• Objectives and discussion questions ….… 10 m.
• Panelist overview presentations ...…….… 70 m.
(Coffee break)
30 m.
• Question-driven discussion period …..….. 60 m.
• Summary of views / action items ..……… 10 m.
______________
180 m.
FOR THIS SESSION, “QOS” INCLUDES:
“Customer-perceived” QOS (voice, video, data, control)
• Subjective measures (summarize human judgment)
• Objective measures (mimic perception and judgment)
“Terminal-to-terminal” and “Network” QOS
• Speed, accuracy, dependability of defined functions
(e.g., IP packet transfer delay, IP packet loss ratio)
• Service Availability (data transfer and call control)
 Distinguished from “QOS mechanisms” that enable
“QOS” to be provided by networks and terminals.
MULTIMEDIA QOS ELEMENTS








Customer-Perceived QOS
Voice
Video
Data
Call Control
 Subjective Measures
 Objective Measures
Voice
Video
Data
Call Control
Terminal-to-Terminal QOS
 Speed, Accuracy, Dependability
 Service Availability
Multimedia
Terminal
Network QOS
Network QOS
Network QOS
Control
Network
Control
Network
Control
Network
Bearer
Network
Bearer
Network
Bearer
Network
Multimedia
Terminal
QOS COMMITMENT MODELS
•
•
•
•
•
Best effort (traditional Internet)
One size fits all (traditional PSTN)
Selectable network behavior (e.g., Diffserv)
Selectable performance values (ATMF)
Selectable QOS Classes (ITU-T SG 13)
 Goal: Enable QOS allocation and/or concatenation
in a multiple technology, multiple service provider
environment.
QOS MECHANISMS
•
•
•
•
•
Admission control / traffic management
Priorities (e.g. for queuing resources)
Resource reservation
Traffic segregation (transport and routing)
Protection switching / rerouting
 Can be implemented per packet type, per source
or destination, per aggregate, or per “connection.”
SOME DISCUSSION QUESTIONS
1. What QOS levels will be required to support
interactive multimedia communications and other
real-time IP network services?
2. Can a limited set of QOS classes be defined to cover
the wide range of services that will be supported by
future IP networks?
3. How will QOS classes be supported by IP network
traffic handling or resource reservation mechanisms?
4. How will control of QOS mechanisms be coordinated
in a multi-technology, multi-provider environment?
FURTHER DISCUSSION QUESTIONS
5. How will QOS differentiation be verified, among
networks and on an end-to-end basis?
6. Will it be possible to make quantitative QOS
commitments (e.g., assured MOS levels) to
customers of multi-provider connections?
7. By what processes will the industry converge on a
workable scheme for supporting end-to-end QOS?
Additional questions are encouraged …
SESSION OBJECTIVES
•
Promote cooperation and a common vision among
ITU-T, IETF, and regional standards groups
addressing multimedia QOS needs in a hybrid
IP/PSTN environment.
• Identify specific goals for cooperative action in the
development of IP/PSTN QOS standards.
• Identify “volunteers” to spearhead such action.
Table 1/Y.1541 –
Provisional IP QOS Class Definitions and
Network Performance Objectives
QoS Classes
Nature of the network
performance objective
IPTD
IPDV
IPLR
Upper bound on the
Mean IPTD
(Note 6)
Upper bound on the
1-10-4 quantile of IPTD
minus the minimum
IPTD
(Note 1)
Upper bound on the
Packet loss probability
IPER
Upper bound
SPR
Upper bound
Default
objectives
Class 0
Class 1
(Interactive)
Class 2
(NonInteractive)
1 sec
(Note 3)
Class 3
(U class)
No default 150 ms
400 ms
No default
50 ms
(Note
4)
50 ms
(Note 4)
1 sec
(Note 3
U
No default
1*10-3
(Note
2)
default
1*10-3
(Note 2)
(Note 5)
default
1*10-3
U
default
U
default
default
default
U
1*10-4
(Note 7)
default
TBD
U