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Standards for E2E QoS Delivery: Progress and Future Needs

Standards for E2E QoS Delivery: Progress and Future Needs. July 25, 2003 Al Morton. Viewpoints of QoS. Objectives Reality. From G.1000, “ Communications Quality of Service: A Framework and Definitions”. QoS Agreements - Future. User. Application. Network(s). Application Requirements

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Standards for E2E QoS Delivery: Progress and Future Needs

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

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

  3. 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

  4. 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 400 ms U 100ms 100ms 400ms 1 s 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 1*10 1*10 U 1*10 1*10 1*10 packet loss probability -4 IPER Upper bound 1*10 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. ER ER R R R R 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)

  6. 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

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