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Content for  TR 22.948  Word version:  16.0.0

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1  ScopeWord‑p. 6

The present document studies the requirements for IP-Multimedia Subsystem (IMS) Convergent Multimedia Conferencing (CMMC) service in IMS. Specifically, the objective of this study item is to:
  1. Identify features of IMS multimedia conferencing, and describe potential service requirements for IMS multimedia conferencing.
  2. Identify the IMS requirements for multimedia conferencing services:
    1. the conference framework
    2. data sharing session establishment/termination/management in a conference
    3. media control for audio, video and data
    4. floor control for audio, video and data
    5. conference policy
  3. Identify possible routes to standardization by:
    1. Adopting existing and emerging standards, e.g. OMA, IETF, W3C.
    2. Modifying and enhancing existing and emerging standards.
    3. Developing of new standards.

2  References

The following documents contain provisions which, through reference in this text, constitute provisions of the present document.
  • References are either specific (identified by date of publication, edition number, version number, etc.) or non specific.
  • For a specific reference, subsequent revisions do not apply.
  • For a non-specific reference, the latest version applies. In the case of a reference to a 3GPP document (including a GSM document), a non-specific reference implicitly refers to the latest version of that document in the same Release as the present document.
TR 21.905: "Vocabulary for 3GPP Specifications".
TS 22.228: "Service requirements for the Internet Protocol (IP) multimedia core network subsystem (IMS); Stage 1".
TS 24.147: "Conferencing using the IP Multimedia (IM) Core Network (CN) subsystem; Stage 3".
RFC 4376:  "Requirements for Floor Control Protocols".
RFC 4353:  "A Framework for Conferencing with the Session Initiation Protocol (SIP)".
RFC 4245:  "High-Level Requirements for Tightly Coupled SIP Conferencing"
W3C Working Draft (November 2006): "Voice Browser Call Control: CCXML Version 1.0".
TR 24.880: "Media Server Control using the IP Multimedia (IM) Core Network (CN) subsystem; Stage 3".
TR 22.115: "Charging and billing".
ETSI TS 183 005: "TISPAN; Release 1; PSTN/ISDN Simulation Services: Conference (CONF); Protocol Specification".
OMA Push to Talk over Cellular 2 Requirements;
OMA Push to talk over Cellular (PoC) - Architecture;
TS 22.173: "IP Multimedia Core Network Subsystem (IMS) Multimedia Telephony Service and supplementary services; Stage 1".
draft-ietf-xcon-framework-07:  "A Framework and Data Model for Centralized Conferencing".
TS 23.228: "IP Multimedia Subsystem (IMS); Stage 2".
TS 23.218: "IP Multimedia (IM) session handling; IM call model; Stage 2".

3  Definitions, symbols and abbreviationsWord‑p. 7

3.1  Definitions

For the purposes of the present document, the terms and definitions given in TR 21.905 and the following apply.
CMMC Service Subscriber:
A subscriber that has been provisioned with a CMMC service.
An IP multimedia session with two or more participants. Each conference has a "conference focus". A conference can be uniquely identified by a user. An example for a conference could be a multimedia game, in which the conference focus is located in a game server.
Conference Focus:
The conference focus is an entity which has abilities to host conferences including their creation, maintenance, and manipulation of the media. A conference focus implements the conference policy (e.g. rules for talk burst control, assign priorities and participant's rights).
An individual temporary access or manipulation permission for a specific shared resource (or group of resources) RFC 4376 [4].
Floor Chair:
A floor chair is a human or automated entity, who is authorized to manage access to one floor and can grant, deny or revoke access. The floor chair does not have to be a participant in the conference instance.
Floor Control:
Floor control is a means to manage joint or exclusive access to shared resources in a conferencing environment RFC 4376 [4].
Floor Owner:
Floor owner is a conference participant who is granted the floor and is allowed to send media.
The conference host is a specific conference participant who manages and controls the conference, e.g. adding and removing participants, adding and removing media in the conference, terminating the conference etc. There is only one host in a conference.

3.2  Abbreviations

For the purposes of the present document, the following abbreviations apply in addition to TR 21.905:
Convergent Multi-Media Conference

4  Requirements and objectivesWord‑p. 8

The objective of this study item is to study requirements, terminal requirements and potential new capabilities in 3GPP that need to be standardized for the CMMC service, especially additional features for roaming and interoperability support.

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