TS 26.114
SA4
★
Multimedia Telephony Service for IMS (MTSI) –
Media Handling and Interaction
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Rapporteur: Dr. Jung, Kyunghun
Multimedia Telephony Service for IMS (MTSI), here also referred to as Multimedia Telephony, is a standardized IMS telephony service that builds on the IMS capabilities to establish multimedia communications between terminals within and in-between operator networks. The terminals connect to the IMS using either a fixed access network or a 3GPP access network.
The objective of defining a service is to specify the minimum set of capabilities required in the IP Multimedia Subsystem to secure multi-vendor and multi-operator inter-operability for Multimedia Telephony and related Supplementary Services. The objective also includes defining procedures for inter-working between different clients and networks.
The user experience of multimedia telephony is expected to be equivalent to or better than corresponding circuit-switched telephony services. Multimedia telephony also exploits the richer capabilities of IMS. In particular, multiple media components can be used and dynamically added or dropped during a session.
The present document specifies a client for the Multimedia Telephony Service for IMS (MTSI) supporting conversational speech (including DTMF), video and text transported over RTP with the scope to deliver a user experience equivalent to or better than that of Circuit Switched (CS) conversational services using the same amount of network resources. It defines media handling (e.g. signalling, transport, jitter buffer management, packet-loss handling, adaptation), as well as interactivity (e.g. adding or dropping media during a call). The focus is to ensure a reliable and interoperable service with a predictable media quality, while allowing for flexibility in the service offerings.
The present document describes two client types:
- An MTSI client in terminal which uses a 3GPP access (LTE, HSPA, or EGPRS) to connect to the IMS. These clients are described in Clauses 5 - 17 and Annexes A - M.
- An MTSI client in terminal which uses a fixed access (corded interface, fixed-wireless interface, e.g. Wi-Fi, Bluetooth or DECT/NG DECT) to connect to the IMS. These clients are described in Clause 18.
NOTE 1: MTSI clients can support more than conversational speech, video and text, which is the scope of the present document. See TS 22.173 for the definition of the Multimedia Telephony Service for IMS.
NOTE 2: TS 26.235 and TS 26.236 do not include the specification of an MTSI client, although they include conversational multimedia applications. Only those parts of TS 26.235 and TS 26.236 that are specifically referenced by the present document apply to Multimedia Telephony Service for IMS.
NOTE 3: The present document was started as a conclusion from the study in TR 26.914 on optimization opportunities in Multimedia Telephony for IMS (TR 22.973).
NOTE 4: For ECN, the present specification assumes that an interface enables the MTSI client to read and write the ECN field. This interface is outside the scope of this specification.
short Table of Contents for TS 26.114 Word version: 16.4.0
each title links to the equivalent title in the full ToC
1 Scope [R8] Word-p. 17
2 References Word-p. 17
3 Definitions and abbreviations Word-p. 24
4 System description Word-p. 27
5 Media codecs Word-p. 30
6 Media configuration Word-p. 34
7 Data transport Word-p. 67
8 Jitter buffer management in MTSI clients in terminals Word-p. 85
9 Packet-loss handling Word-p. 90
10 Adaptation Word-p. 96
11 Front-end handling Word-p. 120
12 Inter-working Word-p. 121
13 Void
13a Media types, codecs and formats used for MSRP transport Word-p. 134
14 Supplementary services Word-p. 135
15 Network preference management object Word-p. 135
16 Quality of Experience [R8] Word-p. 150
17 Management of Media Adaptation [R9] Word-p. 167
18 MTSI client in terminal using fixed access [R12] Word-p. 198
19 Additional bandwidth information [R13] Word-p. 203
A Examples of SDP offers and answers Word-p. 211
B Examples of adaptation scenarios Word-p. 288
C Example adaptation mechanisms for speech Word-p. 289
D Reference delay computation algorithm Word-p. 307
E QoS profiles Word-p. 309
F (Normative) Void
G (Normative) DTMF events Word-p. 343
H Network Preference Management Object Device Description Framework Word-p. 347
I QoE Reporting Management Object Device Description Framework [R8] Word-p. 348
J Media Adaptation Management Object Device Description Framework [R9] Word-p. 349
K Computation of b=AS for AMR and AMR-WB [R10] Word-p. 350
L (Normative) Facsimile transmission [R11] Word-p. 360
M IANA registration information for SDP attributes [R12] Word-p. 365
N Computation of b=AS for Video Codec [R12] Word-p. 372
O IANA registration information for RTP Header Extensions [R12] Word-p. 373
P Video packet loss handling operation principles and examples [R12] Word-p. 374
Q Computation of b=AS for EVS [R12] Word-p. 378
R IANA registration information for RTCP Feedback Message Types [R13] Word-p. 382
S (Normative) Multi-party Multimedia Conference Media Handling [R13] Word-p. 383
T SDP examples for Multi-party Multimedia Conference Media Handling [R13] Word-p. 393
U IANA registration information for media types [R14] Word-p. 414
V Delay Adaptation and Example Uses of DBI Signaling [R16] Word-p. 415
W (Normative) Coverage and Handoff Enhancements using Multimedia Error Robustness (CHEM) [R16] Word-p. 422
X Example Maximum Packet Loss Rate (Max. PLR) Values for Setting CHEM Handover Thresholds [R16] Word-p. 428
Y Change history Word-p. 435
