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TR 26.924SA4
Study on improved End-to-End QoS Handling for MTSI

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V15.0.0 (PDF)  2018/06  80 p.
V14.0.0  2017/03  82 p.
V13.0.1  2016/12  82 p.

Rapporteur:  Mr. Frankkila, Tomas

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.

full Table of Contents for  TR 26.924  Word version:   15.0.0

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1  ScopeWord-p. 8
2  References
3  Definitions and abbreviationsWord-p. 9
4  Overview
5  Current QoS reservation mechanisms during session setupWord-p. 10
6  Use casesWord-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 codecsWord-p. 16
6.4  Use case C: Single multi-rate speech codec (AMR), no extra bandwidth allocated for redundancyWord-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 usageWord-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 levelWord-p. 37
6.10  Use case I: Multiple video codecsWord-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
7  Recommended requirementsUp
7.1  Discussion on individual recommended requirements
7.2  Discussion on proposed requirements for new SDP attributes
7.3  Discussion on proposed general requirements for the solution
7.4  Summary of proposed requirementsWord-p. 53
7.5  Definition of new bandwidth information parametersWord-p. 54
8  Potential solution(s)
8.1  Potential solution A: Session re-negotiation
8.2  Potential solution B: New bandwidth modifiers in SDP offer and answer without SDP MiscCapNegWord-p. 57
8.3  Potential solution C: New bandwidth modifiers and SDPMiscCapNeg in SDP offer and answer
8.4  Potential solution D: New attribute for bandwidth information in SDP offer and answer for each RTP payload typeWord-p. 65
8.5  Potential solution E: New bandwidth modifiers only in SDP answer
8.6  Potential solution F: New SDP attribute in SDP offer and answer for entire media line
8.7  Potential solution G: New SDP attribute only in SDP answer
8.8  Potential solution H: Bitrate variations
9  Conclusion and recommendations
A  Determining suitable averaging window lengthWord-p. 74
B  Change historyWord-p. 80

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