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Standards for E2E QoS Delivery: Progress and Future Needs July 25, 2003 Al Morton.

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Presentation on theme: "Standards for E2E QoS Delivery: Progress and Future Needs July 25, 2003 Al Morton."— Presentation transcript:

1 Standards for E2E QoS Delivery: Progress and Future Needs July 25, 2003 Al Morton

2 Viewpoints of QoS From G.1000, Communications Quality of Service: A Framework and Definitions Objectives Reality

3 QoS Agreements - Future Objectives Reality QoS Requirements Perceived QoS QoS Classes & Decisions Topo/Policy Design/Eng. Provisioning QoS Mech. Reports (SLAs) Application Requirements Cnfg.Choices Feedback Monitoring UserApplicationNetwork(s) Request ACK/REJ/Mod Request ACK/REJ/Mod

4 Y.1541 "Provisional IP QoS Classes, Table 1 Network Performance Parameter Nature of Network Performance Objective Class 0Class 1 Class 2Class 3Class 4 Class 5 Un- specified IPTDUpper bound on the mean IPTD 100ms 400 ms 100ms400ms1 s U IPDVUpper bound on the quantile of IPTD minus the minimum IPTD 50ms UUU U IPLRUpper bound on the packet loss probability 1* * * * *10 -3 U IPERUpper bound1*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

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

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


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