Standards for E2E QoS Delivery:Progress and Future Needs

Standards for E2E QoS Delivery:Progress and Future Needs

July 25, 2003 July 25, 2003

Al Morton Al Morton

Viewpoints of QoS Viewpoints of QoS

CUSTOMERSERVICEPROVIDER

Customer’sQOS

Requirements

QOS OfferedBy

Provider

QOSAchieved byProvider

QOSPerceived

By Customer

From G.1000, “Communications Quality of Service: A Framework and Definitions”

ObjectivesReality

QoS Agreements - FutureQoS Agreements - Future

ObjectivesReality

QoSRequirements

PerceivedQoS

QoS Classes& DecisionsTopo/PolicyDesign/Eng.

ProvisioningQoS Mech.

Reports(SLAs)

ApplicationRequirements

Cnfg.Choices

Feedback

Monitoring

User Application Network(s)

Request

ACK/REJ/Mod

Request

ACK/REJ/Mod

Y.1541 "Provisional IP QoS Classes, Table 1”Y.1541 "Provisional IP QoS Classes, Table 1”

NetworkPerformance

Parameter

Nature of NetworkPerformance

Objective

Class 0 Class 1 Class 2 Class 3 Class 4Class 5

Un-specified

IPTD Upper bound on themean IPTD

100ms 400 ms 100ms 400ms 1 s U

IPDV Upper bound on the1-10 -3 quantile ofIPTD minus theminimum IPTD

50ms 50 ms U U U U

IPLR Upper bound on thepacket lossprobability

1*10 -3 1*10 -3 1*10 -3 1*10 -3 1*10 -3 U

IPER Upper bound 1*10 -4 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

Delivering E2E QoS -- More Work NeededDelivering E2E QoS -- More Work Needed

TE TE ER . . . . . .

AS

Network QoS (UNI-UNI)

AS ASCustomer Installation Customer Installation

End-End QoS (User-to-User)

LAN LAN

IP Network Cloud

UNI UNI R R R R ER

DSTSRC

Network QoS Mechanisms

User/Network QoS Signaling Protocols

? Automated Subscription? Authorization/Security? Accounting? Restoration Priority? Admission Priority

Standards and/or Agreement for:

Flexible Degreesof Management Performance

Monitoring

SummarySummary There are many perspectives on QoS: adjectives There are many perspectives on QoS: adjectives

provide more precision.provide more precision. For User-User QoS, customer expectation and For User-User QoS, customer expectation and

application design play a role.application design play a role. Network QoS Objectives are in terms of packet Network QoS Objectives are in terms of packet

transfer performance parameters, and are divided into transfer performance parameters, and are divided into a small number of Classesa small number of Classes

E2E QoS Signaling Requirements Development E2E QoS Signaling Requirements Development under way in SG 11 and IETF NSISunder way in SG 11 and IETF NSIS

Several pieces needed: Subscription, Authorization, Several pieces needed: Subscription, Authorization, Accounting, PrioritiesAccounting, Priorities