1. 24/11/2015 NGN related standardization issues : End-to-end QoS Hyungsoo Kim KT 1GSC-9, Seoul SOURCE:TTA TITLE:Additional Requirements for the standardization of NGN QoS AGENDA ITEM:GTSC 5.2 CONTACT:Hyungsoo Kim, hans9@kt.co.kr, +82-2-526-5190hans9@kt.co.kr GSC9/GTSC-009

2. GSC-9, Seoul General Aspects for NGN QoS In ITU-T Rec. I.350, QoS is defined in Recommendation E.800 as follows: “Collective effect of service performance which determine the degree of satisfaction of a user of the service”. In Recommendation I.350, “NP is measured in terms of parameters which are meaningful to the network provider and are used for the purpose of system design, configuration, operation and maintenance. NP is defined independently of terminal performance and user actions”. TE1 TA NT1 NT2 TE2 User T S R TE1 TA NT1 NT2 TE2 User T S R Network Performance at T Bearer service QoS at T Network Performance at S Bearer service QoS at S QoS at R Quality of Service User Opinion User Opinion

3. GSC-9, Seoul General Aspects for NGN QoS New definition of QoE was raised from ITU-T SG12 QoE is defined as a measure of the overall acceptability of an application or service, as perceived by the user. I.350 defines “General aspects of quality of service and network performance in digital networks, including ISDNs” CNAN CPN TE User Network Performance for NGN Quality of Service for NGN QoE Man-Machine Interface Network Interface New Recommendation for ‘General aspects for NGN QoS’ is required

4. GSC-9, Seoul Harmonization among the existing Recs. ITU has developed ‘protocol layer-dependant performance Recs.’ as follows; Multimedia Performance : G.1000 & G.1010 Hybrid networks performance : Y.HYBperf. IP Performance : Y.1540 & Y.1541 Ethernet Performance : Y.ETHperf. ATM Performance : I.356 MPLS Performance : Y.1561 TCP performance : Y.1531…

5. GSC-9, Seoul Harmonization among the existing Recs. For NGN QoS study, the relationship among the existing performance Recs. should be clarified. It will be based on the basic concept of NGN-GRM Mapping/translation (of parameter or QoS class) approach may be useful. Transport Services Eg.,Voice Telephony Services (audio, etc) Eg,, Data Services (e.g.,WWW, e-mail, etc) Eg., Video Services (TV, movie, etc) Transport Services Eg.,Voice Telephony Services (audio, etc) Eg,, Data Services (e.g.,WWW, e-mail, etc) Eg., Video Services (TV, movie, etc) Transport G.1000 & G.1010 Y.HYBperf. & the others How to be harmonized the developed Recs. should be considered.

6. GSC-9, Seoul More Stringent Objectives in Y.1541 ITU-T Recommendation Y.1541 should be reviewed in light of emerging applications to determine whether it is necessary and practical to specify more stringent objectives for IPLR and IPER, taking into account the compressed data (i.e., G.729a for voice and MPEG-4 for multimedia) New QoS class / Revision of current objectives could be considered Network Performance Parameter Nature of Network Performance Objective Class 0Class 1Class 2Class 3Class 4Class 5 IPTD Upper bound on the mean IPTD 100 ms400 ms100 ms400 ms1 sU IPDV Upper bound on the 1-10 -3 quantile of IPTD minus the minimum IPTD 50 ms UUUU IPLR Upper bound on the packet loss probability 1*10 -3 U IPERUpper bound 1*10 -4 U More stringent objectives for error-related parameters(IPLE & IPER) is needed

7. GSC-9, Seoul Proposal Following three items are proposed as standards issues in NGN end-to-end QoS that need close collaboration among SDOs: –New Recommendation for ‘General aspects for NGN QoS’ –Harmonization among the existing Recs. –More stringent objectives for error-related parameters Reference : Resolution GSC-8/9 : Next Generation Networks