1 NSIS QoS Model for Networks Using Y.1541 QoS Classes (draft-ash-nsis-y1541-qsp-00.txt) Jerry Ash Chuck Dvorak Percy Tarapore Yacine El Mghazli Al Morton Martin Dolly

2 Outline (draft-ash-nsis-y1541-qsp-00.txt) qQoS model (QOSM) based on ITU-T Recommendation Y.1541 qoptional QSPEC parameters v parameters –peak bucket size [Bb] –sustainable rate [Rs] v parameter v qnext steps

3 Y.1541-QOSM qY.1541-QOSM based on ITU-T Recommendation Y.1541 vRecommendation Y.1541 –"Network Performance Objectives for IP-Based Services," May 2002 –specifies 6 QoS service classes specific objectives for delay, delay variation, loss for each class vRecommendation TRQ-QoS-SIG –"Signaling Requirements for IP-QoS," January 2005 –specifies requirements for signaling IP-QoS information based on Y.1541 QoS classes qspecify optional QSPEC parameters & RMF processing to enable Y.1541-QOSM

4 Y.1541 QoS Classes qClass 0: vmean delay <= 100 ms, delay variation <= 50 ms, loss ratio <= 10-3 vreal-time, highly interactive applications, sensitive to jitter vapplication examples: VoIP, video teleconference qClass 1 vmean delay <= 400 ms, delay variation <= 50 ms, loss ratio <= 10-3 vreal-time, interactive applications, sensitive to jitter vapplication examples: VoIP, video teleconference qClass 2 vmean delay <= 100 ms, delay variation unspecified, loss ratio <= 10-3 vhighly interactive transaction data vapplication examples: signaling qClass 3 vmean delay <= 400 ms, delay variation unspecified, loss ratio <= 10-3 vinteractive transaction data vapplication examples: signaling

5 Y.1541 QoS Classes qClass 4 vmean delay <= 1 sec, delay variation unspecified, loss ratio <= 10-3 vlow loss only applications vapplication examples: short transactions, bulk data, video streaming qClass 5 vmean delay unspecified, delay variation unspecified, loss ratio unspecified vunspecified applications vapplication examples: traditional best-effort applications of IP networks

6 Y.1541-QOSM Requirements qMUST be possible to specify vY.1541 QoS class vpeak data rate (p) vpeak bucket size (Bp) vsustainable rate (Rs) vsustainable bucket size (b) vtoken bucket rate (r) vmaximum allowed packet size (M) vDiffServ field [RFC 2474] vreservation priority vrestoration priority vall QSPEC parameters except,, already specified in [QSPEC] qMUST be possible to vaccumulate delay, delay variation & loss ratio across end-to-end path (may span multiple domains) vnegotiate Y.1541 QoS class across domains vnegotiate delay, delay variation, & loss ratio across domains

7 Y.1541-QOSM qadditional optional QSPEC parameters v parameters –peak bucket size [Bb] –sustainable rate [Rs] v parameter –high, normal, best effort v –set to 1 if Y.1541 QoS Class constraints cannot be met

8 Next Steps qprogress draft as Informational RFC with feedback & review by NSIS WG vpropose to make an NSIS WG draft