ETSI TS 126 114 V15.5.0 (2019-05)

TECHNICAL SPECIFICATION
Universal Mobile Telecommunications System (UMTS);
LTE;
IP Multimedia Subsystem (IMS);
Multimedia telephony;
Media handling and interaction
(3GPP TS 26.114 version 15.5.0 Release 15)

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3GPP TS 26.114 version 15.5.0 Release 15 1 ETSI TS 126 114 V15.5.0 (2019-05)

Reference
RTS/TSGS-0426114vf50
Keywords
LTE,UMTS
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TM TM TM
DECT , PLUGTESTS , UMTS and the ETSI logo are trademarks of ETSI registered for the benefit of its Members.
TM TM
3GPP and LTE are trademarks of ETSI registered for the benefit of its Members and
of the 3GPP Organizational Partners.
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ETSI
3GPP TS 26.114 version 15.5.0 Release 15 2 ETSI TS 126 114 V15.5.0 (2019-05)
Intellectual Property Rights
Essential patents
IPRs essential or potentially essential to normative deliverables may have been declared to ETSI. The information
pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found
in ETSI SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in
respect of ETSI standards", which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web
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Foreword
This Technical Specification (TS) has been produced by ETSI 3rd Generation Partnership Project (3GPP).
The present document may refer to technical specifications or reports using their 3GPP identities, UMTS identities or
GSM identities. These should be interpreted as being references to the corresponding ETSI deliverables.
The cross reference between GSM, UMTS, 3GPP and ETSI identities can be found under
http://webapp.etsi.org/key/queryform.asp.
Modal verbs terminology
In the present document "shall", "shall not", "should", "should not", "may", "need not", "will", "will not", "can" and
"cannot" are to be interpreted as described in clause 3.2 of the ETSI Drafting Rules (Verbal forms for the expression of
provisions).
"must" and "must not" are NOT allowed in ETSI deliverables except when used in direct citation.
ETSI
3GPP TS 26.114 version 15.5.0 Release 15 3 ETSI TS 126 114 V15.5.0 (2019-05)
Contents
Intellectual Property Rights . 2
Foreword . 2
Modal verbs terminology . 2
Foreword . 15
Introduction . 15
1 Scope . 16
2 References . 16
3 Definitions and abbreviations . 23
3.1 Definitions . 23
3.2 Abbreviations . 24
4 System description . 26
4.1 System . 26
4.2 Client . 27
4.3 MRFP and MGW . 28
5 Media codecs . 28
5.1 Media components . 28
5.2 Codecs for MTSI clients in terminals . 29
5.2.1 Speech . 29
5.2.1.1 General codec requirements . 29
5.2.1.2 Detailed codec requirements, AMR . 29
5.2.1.3 Detailed codec requirements, AMR-WB . 29
5.2.1.4 Detailed codec requirements, EVS . 29
5.2.1.5 Offering multiple audio bandwidths and multiple channels . 30
5.2.1.6 Codec preference order . 30
5.2.2 Video . 30
5.2.3 Real-time text . 32
6 Media configuration . 32
6.1 General . 32
6.2 Session setup procedures . 33
6.2.1 General . 33
6.2.1a RTP profile negotiation . 33
6.2.1a.1 General . 33
6.2.1a.2 Using SDPCapNeg in SDP offer . 33
6.2.1a.3 Answering to an SDP offer using SDPCapNeg . 34
6.2.2 Speech . 34
6.2.2.1 General . 34
6.2.2.2 Generating SDP offers . 35
6.2.2.3 Generating SDP answer . 38
6.2.3 Video . 46
6.2.3.1 Introduction . 46
6.2.3.2 Common Session Setup Procedures . 47
6.2.3.3 Coordination of Video Orientation (CVO) . 48
6.2.3.4 Video Region-of-Interest (ROI) . 48
6.2.3.5 RTP Retransmission . 51
6.2.3.6 Forward Error Correction (FEC) . 51
6.2.4 Text . 51
6.2.5 Bandwidth negotiation . 52
6.2.5.1 General . 52
6.2.5.2 Speech . 54
6.2.5.3 Video . 56
6.2.6 The Synchronization Info attribute "3gpp_sync_info" . 57
6.2.7 Negotiated QoS parameters . 58
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6.2.7.1 General . 58
6.2.7.2 Alignment of negotiated QoS parameters and b=AS bandwidth modifier . 58
6.2.7.3 Alignment of negotiated QoS parameters and a=bw-info attribute . 59
6.3 Session control procedures . 59
7 Data transport . 60
7.1 General . 60
7.2 RTP profiles . 60
7.3 RTCP usage . 60
7.3.1 General . 60
7.3.2 Speech . 61
7.3.3 Video . 62
7.3.4 Real-time text . 63
7.3.5 Void . 63
7.3.6 Reduced-Size RTCP . 63
7.3.7 Video Region-of-Interest (ROI) Signaling . 64
7.4 RTP payload formats for MTSI clients . 67
7.4.1 General . 67
7.4.2 Speech . 67
7.4.3 Video . 68
7.4.4 Real-time text . 68
7.4.5 Coordination of Video Orientation . 68
7.4.6 RTP Retransmission . 71
7.4.7 Forward Error Correction (FEC) . 71
7.5 Media flow . 71
7.5.1 General . 71
7.5.2 Media specific . 71
7.5.2.1 Speech . 71
7.5.2.1.1 General . 71
7.5.2.1.2 Default operation . 71
7.5.2.1.2.1 General . 71
7.5.2.1.2.2 Codec Mode Requests. 72
7.5.2.1.2.3 Frame aggregation and redundancy . 72
7.5.2.1.3 HSPA . 72
7.5.2.1.4 EGPRS. 72
7.5.2.1.5 GIP . 73
7.5.2.1.6 Initial codec mode for AMR and AMR-WB . 73
7.5.2.1.7 E-UTRAN and NR . 73
7.5.2.1.8 Initial codec mode for EVS . 74
7.5.2.1.9 Dual-mono . 74
7.5.2.2 Video . 74
7.5.2.3 Text . 74
7.5.3 Media synchronization . 74
7.5.3.1 General . 74
7.5.3.2 Text . 75
7.5.4 ECN usage in RTP sessions . 75
7.5.5 Handling of bit-rate variations . 75
7.5.5.1 General . 75
7.5.5.2 Video . 75
7.5.5.3 Speech . 76
8 Jitter buffer management in MTSI clients in terminals . 76
8.1 General . 76
8.2 Speech . 76
8.2.1 Terminology . 76
8.2.2 Functional requirements for jitter-buffer management . 77
8.2.3 Minimum performance requirements for jitter-buffer management . 77
8.2.3.1 General . 77
8.2.3.2 Objective performance requirements . 78
8.2.3.2.1 General . 78
8.2.3.2.2 Jitter buffer delay criteria . 78
8.2.3.2.3 Jitter induced concealment operations . 79
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8.2.3.3 Delay and error profiles . 80
8.2.3.4 Speech material for JBM minimum performance evaluation . 80
8.3 Video . 80
8.4 Text . 80
9 Packet-loss handling . 81
9.1 General . 81
9.2 Speech . 81
9.2.1 General . 81
9.2.2 Transmitting redundant frames . 81
9.2.3 Receiving redundant frames . 84
9.3 Video . 85
9.3.1 General . 85
9.3.2 Receiver behaviour . 85
9.3.3 Sender behaviour . 85
9.3.4 Recommendations for packet loss recovery mechanisms usage . 86
9.4 Text . 86
10 Adaptation . 87
10.1 General . 87
10.2 Speech . 87
10.2.0 General . 87
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 . 89
10.2.1.2a Padding . 90
10.2.1.3 Redundancy Request . 90
10.2.1.4 Frame Aggregation Request . 90
10.2.1.5 Codec Mode Request . 91
10.2.1.6 Generation of RTP payloads for multiple codec control requests . 92
10.2.1.7 EVS Primary Rate Request . 93
10.2.1.8 EVS Bandwidth Request . 94
10.2.1.9 EVS Channel Aware Request . 94
10.2.1.10 EVS Primary mode to EVS AMR-WB IO mode Switching Request . 95
10.2.1.11 EVS AMR-WB IO mode to EVS Primary mode Switching Request . 96
10.2.2 Example use cases . 96
10.2.3 SDP negotiation for RTCP-APP . 98
10.3 Video . 100
10.3.1 General . 100
10.3.2 Signaling mechanisms . 100
10.3.3 Adaptation triggers . 101
10.3.4 Sender behavior, downswitching . 102
10.3.4.1 Downswitching divided into phases . 102
10.3.4.2 Rate reduction phase . 102
10.3.4.3 Delay recovery phase . 103
10.3.5 Sender behavior, up-switching. 103
10.3.6 Receiver behavior, down-switching . 103
10.3.7 Receiver behavior, up-switch. 103
10.3.8 ECN triggered adaptation . 104
10.4 Text . 105
10.5 Explicit Congestion Notification . 105
10.6 Using the a=bw-info attribute for adaptation . 105
10.7 Access network bitrate recommendation . 106
10.7.1 General . 106
10.7.2 Relation to session signaling bitrate information . 106
10.7.3 Use with dynamic bitrate adaptation . 106
10.7.3.1 General . 106
10.7.3.2 Adaptation of sent media . 107
10.7.3.3 Adaptation of received media . 110
10.7.4 Message mapping for LTE access . 110
10.7.5 Message mapping for NR access . 110
11 Front-end handling . 111
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11.1 General . 111
12 Inter-working . 112
12.1 General . 112
12.2 3G-324M . 112
12.2.1 General . 112
12.2.2 Codec usage . 112
12.2.2.1 General . 112
12.2.2.2 Text . 112
12.2.3 Payload format . 112
12.2.4 MTSI media gateway trans-packetization . 112
12.2.4.1 General . 112
12.2.4.2 Speech de-jitter buffer . 112
12.2.4.3 Video bitrate equalization . 113
12.2.4.4 Data loss detection . 113
12.2.4.5 Data integrity indication . 113
12.2.4.6 Packet size considerations . 113
12.2.4.6.0 General . 113
12.2.4.6.1 The Maximum Receive SDU Size attribute "3gpp_MaxRecvSDUSize" . 114
12.2.4.7 Setting RTP timestamps . 114
12.2.4.8 Protocol termination . 114
12.2.4.9 Media synchronization . 114
12.2.5 Session control . 115
12.3 GERAN/UTRAN CS inter-working . 115
12.3.0 3G-324M . 115
12.3.1 Codecs for MTSI media gateways . 115
12.3.1.1 Speech interworking between 3GPP PS access and CS GERAN/UTRAN. 115
12.3.1.1a Speech inter-working between fixed access and CS GERAN/UTRAN . 116
12.3.1.2 Text . 116
12.3.2 RTP payload formats for MTSI media gateways . 116
12.3.2.1 Speech . 116
12.3.2.2 Text . 118
12.3.3 Explicit Congestion Notification . 118
12.3.4 Codec switching procedures with SRVCC . 118
12.4 PSTN . 118
12.4.1 3G-324M . 118
12.4.2 Text . 119
12.5 GIP inter-working. 119
12.5.1 Text . 119
12.5.2 Speech . 119
12.6 Void . 119
12.6.1 Void . 119
12.6.2 Void . 119
12.7 Inter-working with other IMS and non-IMS IP networks . 119
12.7.1 General . 119
12.7.2 Speech . 120
12.7.2.1 General . 120
12.7.2.2 Speech codecs and formats . 120
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 . 120
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 . 120
12.7.2.2.3 Common procedures . 121
12.7.2.3 Codec preference order for session negotiation . 121
12.7.2.4 RTP profiles . 121
12.7.2.5 RTP payload formats. 121
12.7.2.6 Packetization . 122
12.7.2.7 RTCP usage and adaptation . 122
12.7.2.8 RTP usage . 123
12.7.2.9 Session setup and session modification. 123
12.7.2.10 Audio level alignment . 123
12.7.3 Explicit Congestion Notification . 124
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12.7.4 Text . 124
12.7.5 Inter-working IPv4 and IPv6 networks . 124
12.8 MGW handling for NO_REQ interworking . 124
13 Void . 125
13a Media types, codecs and formats used for MSRP transport . 125
13a.1 General . 125
13a.2 Difference relative to 3GPP TS 26.141 . 125
13a.2.1 Video . 125
14 Supplementary services . 125
14.1 General . 125
14.2 Media formats and transport . 126
14.3 Media handling in hold procedures . 126
15 Network preference management object . 126
15.1 General . 126
15.2 Nodes Definition .
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