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ITU-T Study Group 16 (Study Period 2005-2008) |
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Question 24/16 - Quality of Service and End-to-end Performance in Multimedia Systems |
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(Continuation of Question F/16)
- Motivation
ITU-T Study Group 16 has focused on the H.300-series standardization of real-time audiovisual
conversational services and systems, such as videoconferencing and video telephony, over various
types of networks. In past work, either a high level of QoS was assumed to be provided by the network
(H.320/ISDN) or the network was assumed to have no ability to provide QoS (H.323 V1/LANs). Looking
forward, MM will be most frequently operated over packet networks that support various types of QoS
features, including but not limited to ATM QoS services and IP QoS services. The general topic of
how MM systems and coders interact with and request QoS from the network and how this relates to end-to-end performance requires further study.
- Study Items
- QoS needs of MM systems and coders.
- Preferred signalling methods for QoS in MM systems.
- End-to-end application level methods to provide better QoS in lossy networks, including routed packet networks and mobile networks.
- Common API or interfaces to network based QoS mechanisms.
- End-to-end latency and QoS.
- Other aspects of end-to-end performance as perceived by the user.
- Alignment with goals related to the Mediacom, and NGN Project.
- Service level QoS classification of multimedia applications and services and Application Service Level Agreement (SLA) definitions.
- Descriptions of network QoS capabilities in terms of network QoS classes and/or network Service Level Agreement (SLA) definitions.
- Mapping between multimedia application QoS requirements and network QoS capabilities.
- Tasks
Enhanced QoS signalling in H.323/H.225.0/H.245 (2004-2007 when they are revised).
- QoS signalling in Application Service Provider equipment and possible future terminals (2005+).
- Input to terms of reference for audio and video coders that maximize QoS in lossy networks (2005).
- Input to IETF, IMT-2000, ATMF, SG 11 and SG 13 on MM QoS needs (2004).
An up-to-date status of work under this Question is contained in the
SG 16 Work Programme.
- Relationships
Recommendations:
- G.1000, G.1010, Y.1540, Y.1541
Questions:
- All project Questions in SG 16.
- SG 16 on the Mediacom Project.
Study Groups:
- SG 11 for ATM QoS and QoS Signalling.
- SG 13 on the NGN Project.
- SG 12 on performance.
Other bodies:
- ATM Forum;
- IETF for Internet QoS RFCs;
- ETSI TISPAN;
- IMTC.
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