Standards for E2E QoS Delivery: Progress and Future Needs

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Standards for E2E QoS DeliveryProgress and
Future Needs

• July 25, 2003
• Al Morton

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Viewpoints of QoS
Objectives Reality
From G.1000, Communications Quality of Service
A Framework and Definitions
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QoS Agreements - Future
User
Application
Network(s)
Application Requirements Cnfg.Choices
Request ACK/REJ/Mod
Request ACK/REJ/Mod
QoS Requirements
QoS Classes Decisions Topo/Policy Design/Eng.
Objectives Reality
Provisioning QoS Mech. Reports (SLAs)
Feedback Monitoring
Perceived QoS
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Y.1541 "Provisional IP QoS Classes, Table 1
Class 5
Network
Nature of Network
Class 0
Class 1
Class 2
Class 3
Class 4
Un-
Performance
Performance
specified
Parameter
Objective
IPTD
Upper bound on the
100ms
400 ms
100ms
400ms
1 s
U
mean IPTD
IPDV
Upper bound on the
-3
1-10
quantile of
50ms
50 ms
U
U
U
U
IPTD minus the
minimum IPTD
IPLR
Upper bound on the
-3
-3
-3
-3
-3
110
110
U
110
110
110
packet loss
probability
-4
IPER
Upper bound
110
U

• Y.1541 Principles
• Per Flow Objectives satisfy a wide range of User
  Applications
• Small set of Network QoS classes simplifies
  network engineering
• Evaluation Interval is 1 minute for most
  objectives
• Packet Payload Sizes suggested for Evaluation
  160 and 1500 bytes
• Objectives apply while IP Service is Available

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Delivering E2E QoS -- More Work Needed
? Automated Subscription ? Authorization/Security
? Accounting ? Restoration Priority ? Admission
Priority
Standards and/or Agreement for
Flexible Degrees of Management
Performance Monitoring
User/Network QoS Signaling Protocols
Network QoS Mechanisms
SRC
DST
IP Network Cloud
UNI
UNI
TE
TE
. . .
. . .
LAN
LAN
Customer Installation
Customer Installation
AS
AS
AS
Network QoS (UNI-UNI)
End-End QoS (User-to-User)
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Summary

• There are many perspectives on QoS adjectives
  provide more precision.
• For User-User QoS, customer expectation and
  application design play a role.
• Network QoS Objectives are in terms of packet
  transfer performance parameters, and are divided
  into a small number of Classes
• E2E QoS Signaling Requirements Development under
  way in SG 11 and IETF NSIS
• Several pieces needed Subscription,
  Authorization, Accounting, Priorities