ETSI TS 126 114 V13.11.0 (2021-05)

Universal Mobile Telecommunications System (UMTS); LTE; 5G; IP Multimedia Subsystem (IMS); Multimedia telephony; Media handling and interaction (3GPP TS 26.114 version 13.11.0 Release 13)

RTS/TSGS-0426114vdb0

General Information

• Status: Not Published
• Technical Committee: 3GPP SA 4 - Codec
• Current Stage: 12 - Completion
• Completion Date: 28-May-2021

Standards Content (Sample)

TECHNICAL SPECIFICATION
Universal Mobile Telecommunications System (UMTS);
LTE;
5G;
IP Multimedia Subsystem (IMS);
Multimedia telephony;
Media handling and interaction
(3GPP TS 26.114 version 13.11.0 Release 13)


3GPP TS 26.114 version 13.11.0 Release 13 1 ETSI TS 126 114 V13.11.0 (2021-05)

Reference
RTS/TSGS-0426114vdb0
Keywords
5G,LTE,UMTS
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ETSI
3GPP TS 26.114 version 13.11.0 Release 13 2 ETSI TS 126 114 V13.11.0 (2021-05)
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ETSI
3GPP TS 26.114 version 13.11.0 Release 13 3 ETSI TS 126 114 V13.11.0 (2021-05)
Contents
Intellectual Property Rights . 2
Legal Notice . 2
Modal verbs terminology . 2
Foreword . 14
Introduction . 14
1 Scope . 15
2 References . 15
3 Definitions and abbreviations . 22
3.1 Definitions . 22
3.2 Abbreviations . 23
4 System description . 25
4.1 System . 25
4.2 Client . 25
4.3 MRFP and MGW . 27
5 Media codecs . 27
5.1 Media components . 27
5.2 Codecs for MTSI clients in terminals . 28
5.2.1 Speech . 28
5.2.1.1 General codec requirements . 28
5.2.1.2 Detailed codec requirements, AMR . 28
5.2.1.3 Detailed codec requirements, AMR-WB . 28
5.2.1.4 Detailed codec requirements, EVS . 29
5.2.1.5 Offering multiple audio bandwidths and multiple channels . 29
5.2.1.6 Codec preference order . 29
5.2.2 Video . 29
5.2.3 Real-time text . 31
6 Media configuration . 31
6.1 General . 31
6.2 Session setup procedures . 32
6.2.1 General . 32
6.2.1a RTP profile negotiation . 32
6.2.1a.1 General . 32
6.2.1a.2 Using SDPCapNeg in SDP offer . 33
6.2.1a.3 Answering to an SDP offer using SDPCapNeg . 33
6.2.2 Speech . 33
6.2.2.1 General . 33
6.2.2.2 Generating SDP offers . 34
6.2.2.3 Generating SDP answer . 37
6.2.3 Video . 45
6.2.3.1 Introduction . 45
6.2.3.2 Common Session Setup Procedures . 46
6.2.3.3 Coordination of Video Orientation (CVO) . 47
6.2.3.4 Video Region-of-Interest (ROI) . 47
6.2.3.5 RTP Retransmission . 50
6.2.3.6 Forward Error Correction (FEC) . 50
6.2.4 Text . 50
6.2.5 Bandwidth negotiation . 51
6.2.5.1 General . 51
6.2.5.2 Speech . 52
6.2.5.3 Video . 54
6.2.6 The Synchronization Info attribute "3gpp_sync_info" . 55
6.2.7 Negotiated QoS parameters . 56
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6.2.7.1 General . 56
6.2.7.2 Alignment of negotiated QoS parameters and b=AS bandwidth modifier . 56
6.2.7.3 Alignment of negotiated QoS parameters and a=bw-info attribute . 57
6.3 Session control procedures . 57
7 Data transport . 58
7.1 General . 58
7.2 RTP profiles . 58
7.3 RTCP usage . 58
7.3.1 General . 58
7.3.2 Speech . 59
7.3.3 Video . 60
7.3.4 Real-time text . 61
7.3.5 Void . 61
7.3.6 Reduced-Size RTCP . 61
7.3.7 Video Region-of-Interest (ROI) Signaling . 62
7.4 RTP payload formats for MTSI clients . 65
7.4.1 General . 65
7.4.2 Speech . 65
7.4.3 Video . 66
7.4.4 Real-time text . 66
7.4.5 Coordination of Video Orientation . 67
7.4.6 RTP Retransmission . 69
7.4.7 Forward Error Correction (FEC) . 69
7.5 Media flow . 69
7.5.1 General . 69
7.5.2 Media specific . 69
7.5.2.1 Speech . 69
7.5.2.1.1 General . 69
7.5.2.1.2 Default operation . 69
7.5.2.1.2.1 General . 69
7.5.2.1.2.2 Codec Mode Requests. 70
7.5.2.1.2.3 Frame aggregation and redundancy . 70
7.5.2.1.3 HSPA . 70
7.5.2.1.4 EGPRS. 71
7.5.2.1.5 GIP . 71
7.5.2.1.6 Initial codec mode for AMR and AMR-WB . 71
7.5.2.1.7 E-UTRAN . 72
7.5.2.1.8 Initial codec mode for EVS . 72
7.5.2.1.9 Dual-mono . 72
7.5.2.2 Video . 72
7.5.2.3 Text . 72
7.5.3 Media synchronization . 73
7.5.3.1 General . 73
7.5.3.2 Text . 73
7.5.4 ECN usage in RTP sessions . 73
7.5.5 Handling of bit-rate variations . 73
7.5.5.1 General . 73
7.5.5.2 Video . 74
7.5.5.3 Speech . 74
8 Jitter buffer management in MTSI clients in terminals . 74
8.1 General . 74
8.2 Speech . 74
8.2.1 Terminology . 74
8.2.2 Functional requirements for jitter-buffer management . 76
8.2.3 Minimum performance requirements for jitter-buffer management . 76
8.2.3.1 General . 76
8.2.3.2 Objective performance requirements . 77
8.2.3.2.1 General . 77
8.2.3.2.2 Jitter buffer delay criteria . 77
8.2.3.2.3 Jitter induced concealment operations . 78
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8.2.3.3 Delay and error profiles . 79
8.2.3.4 Speech material for JBM minimum performance evaluation . 79
8.3 Video . 79
8.4 Text . 79
9 Packet-loss handling . 80
9.1 General . 80
9.2 Speech . 80
9.2.1 General . 80
9.2.2 Transmitting redundant frames . 80
9.2.3 Receiving redundant frames . 83
9.3 Video . 84
9.3.1 General . 84
9.3.2 Receiver behaviour . 84
9.3.3 Sender behaviour . 84
9.3.4 Recommendations for packet loss recovery mechanisms usage . 85
9.4 Text . 86
10 Adaptation . 86
10.1 General . 86
10.2 Speech . 86
10.2.0 General . 86
10.2.1 RTCP-APP with codec control requests . 88
10.2.1.1 General . 88
10.2.1.2 General Format of RTCP-APP packet with codec control requests . 88
10.2.1.2a Padding . 89
10.2.1.3 Redundancy Request . 89
10.2.1.4 Frame Aggregation Request . 90
10.2.1.5 Codec Mode Request . 90
10.2.1.6 Generation of RTP payloads for multiple codec control requests . 91
10.2.1.7 EVS Primary Rate Request . 92
10.2.1.8 EVS Bandwidth Request . 93
10.2.1.9 EVS Channel Aware Request . 93
10.2.1.10 EVS Primary mode to EVS AMR-WB IO mode Switching Request . 94
10.2.1.11 EVS AMR-WB IO mode to EVS Primary mode Switching Request . 95
10.2.2 Example use cases . 95
10.2.3 SDP negotiation for RTCP-APP . 97
10.3 Video . 99
10.3.1 General . 99
10.3.2 Signaling mechanisms . 99
10.3.3 Adaptation triggers . 100
10.3.4 Sender behavior, downswitching . 100
10.3.4.1 Downswitching divided into phases . 100
10.3.4.2 Rate reduction phase . 101
10.3.4.3 Delay recovery phase . 102
10.3.5 Sender behavior, up-switching. 102
10.3.6 Receiver behavior, down-switching . 102
10.3.7 Receiver behavior, up-switch. 102
10.3.8 ECN triggered adaptation . 102
10.4 Text . 103
10.5 Explicit Congestion Notification . 104
10.6 Using the a=bw-info attribute for adaptation . 104
11 Front-end handling . 104
11.1 General . 104
12 Inter-working . 105
12.1 General . 105
12.2 3G-324M . 106
12.2.1 General . 106
12.2.2 Codec usage . 106
12.2.2.1 General . 106
12.2.2.2 Text . 106
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12.2.3 Payload format . 106
12.2.4 MTSI media gateway trans-packetization . 106
12.2.4.1 General . 106
12.2.4.2 Speech de-jitter buffer . 106
12.2.4.3 Video bitrate equalization . 106
12.2.4.4 Data loss detection . 107
12.2.4.5 Data integrity indication . 107
12.2.4.6 Packet size considerations . 107
12.2.4.6.0 General . 107
12.2.4.6.1 The Maximum Receive SDU Size attribute “3gpp_MaxRecvSDUSize” . 107
12.2.4.7 Setting RTP timestamps . 108
12.2.4.8 Protocol termination . 108
12.2.4.9 Media synchronization . 108
12.2.5 Session control . 108
12.3 GERAN/UTRAN CS inter-working . 109
12.3.0 3G-324M . 109
12.3.1 Codecs for MTSI media gateways . 109
12.3.1.1 Speech interworking between 3GPP PS access and CS GERAN/UTRAN. 109
12.3.1.1a Speech inter-working between fixed access and CS GERAN/UTRAN . 110
12.3.1.2 Text . 110
12.3.2 RTP payload formats for MTSI media gateways . 110
12.3.2.1 Speech . 110
12.3.2.2 Text . 111
12.3.3 Explicit Congestion Notification . 112
12.3.4 Codec switching procedures with SRVCC . 112
12.4 PSTN . 112
12.4.1 3G-324M . 112
12.4.2 Text . 112
12.5 GIP inter-working. 113
12.5.1 Text . 113
12.5.2 Speech . 113
12.6 Void . 113
12.6.1 Void . 113
12.6.2 Void . 113
12.7 Inter-working with other IMS and non-IMS IP networks . 113
12.7.1 General . 113
12.7.2 Speech . 114
12.7.2.1 General . 114
12.7.2.2 Speech codecs and formats . 114
12.7.2.2.1 MTSI MGW for interworking between MTSI client in terminal using 3GPP access and other
IMS or non-IMS IP networks . 114
12.7.2.2.2 MTSI MGW for interworking between MTSI client in terminal using fixed access and other
IMS or non-IMS IP networks . 114
12.7.2.2.3 Common procedures . 115
12.7.2.3 Codec preference order for session negotiation . 115
12.7.2.4 RTP profiles . 115
12.7.2.5 RTP payload formats. 115
12.7.2.6 Packetization . 116
12.7.2.7 RTCP usage and adaptation . 116
12.7.2.8 RTP usage . 117
12.7.2.9 Session setup and session modification. 117
12.7.2.10 Audio level alignment . 117
12.7.3 Explicit Congestion Notification . 118
12.7.4 Text . 118
12.7.5 Inter-working IPv4 and IPv6 networks . 118
13 Void . 118
13a Media types, codecs and formats used for MSRP transport . 119
13a.1 General . 119
13a.2 Difference relative to 3GPP TS 26.141 . 119
13a.2.1 Video . 119
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14 Supplementary services . 119
14.1 General . 119
14.2 Media formats and transport . 119
14.3 Media handling in hold procedures . 120
15 Network preference management object . 120
15.1 General . 120
15.2 Nodes Definition . 120
15.3 Example Configuration of 3GPP MTSINP MO .
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