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TR 26.924 (SA4)
Study on improved end-to-end QoS handling for MTSI

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V14.0.0 (PDF)  2017/03  82 p.
V13.0.1  2016/12  82 p.


Rapporteur:  Mr. Frankkila, Tomas
See also:  MMTel-related TS/TR

TS 26.114 define media handling and interaction for the Multimedia Telephony Service for IMS (MTSI) including mechanisms for the negotiation of bandwidth using the SDP bandwidth modifiers. The present study investigates potential improvements for the end-to-end QoS handling with the purpose to improve the network resource allocation for variable bit-rate codecs, rate-adaptive codecs and asymmetric sessions (i.e. different bitrates for different directions). The study will focus on SDP extensions and the interaction with the policy control.


 

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1  ScopePDF-p. 8
2  References
3  Definitions and abbreviationsPDF-p. 9
4  Overview
5  Current QoS reservation mechanisms during session setupPDF-p. 10
6  Use casesPDF-p. 14
6.1  General description
6.2  Use case A: Single fixed-rate speech codec
6.3  Use case B: Several fixed-rate speech codecsPDF-p. 16Up
6.4  Use case C: Single multi-rate speech codec (AMR), no extra bandwidth allocated for redundancyPDF-p. 25
6.5  Use case D: Single multi-rate speech codec (AMR) with extra bandwidth allocated for redundancy
6.6  Use case E: Several multi-rate speech codecs (AMR and AMR-WB)
6.7  Use case F: Single video codec, symmetric usagePDF-p. 32
6.8  Use case G: Single video codec, asymmetric usage, sending video with a bitrate matching the codec level
6.9  Use case H: Single video codec, asymmetric usage, sending video with a bitrate lower than the supported codec levelPDF-p. 37
6.10  Use case I: Multiple video codecsPDF-p. 39
6.11  Use case J: Single video codec, symmetric usage, bitrate variations
6.12  Use case K: Several multi-rate speech codecs (AMR, AMR-WB and EVS), small difference in EVS usage between operators
6.13  Use case L: Several multi-rate speech codecs (AMR, AMR-WB and EVS), large difference in EVS usage between operators

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