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3GPP IMS and UMTS Specifications -- 26 Series:
CODECs
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3GPP TS 26.114 |
SA4 |
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IMS - Multimedia Telephony - Media Handling and Interaction |
This TS
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 scope includes maintaining backward compatibility in order to ensure seamless inter-working with existing services available in the CS domain, such as CS speech and video telephony, as well as with terminals of earlier 3GPP releases. In addition, inter-working with traditional PSTN and emerging TISPAN network is covered.
The specification is written in a forward-compatible way in order to allow additions of media components and functionality in releases after Release 7.
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| NOTE 1: |
MTSI clients can support more than conversational speech, video and text, which is the scope of the present document. See
3GPP TS 22.173
for the definition of the Multimedia Telephony Service for IMS.
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| NOTE 2: |
3GPP TS 26.235
and 3GPP TS 26.236 do not include the specification of an MTSI client, although they include conversational multimedia applications. Only those parts of 3GPP TS 26.235 and 3GPP TS 26.236 that are specifically referenced by the present document apply to Multimedia Telephony Service for IMS.
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Rapporteur: Per Frojdh |
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Rapporteur: Roberto Castagno |
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Rapporteur: Harri Honko |
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3GPP TS 26.142 |
SA4 |
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Dynamic and Interactive Multimedia Scenes |
Dynamic and Interactive Multimedia Scenes (DIMS) is a dynamic, interactive, scene-based media system which enables display and interactive control of multimedia data such as audio, video, graphics, images and text. It ranges from a movie enriched with vector graphic overlays and interactivity (possibly enhanced with closed captions), to complex multi-step services with fluid interaction/interactivity and different media types at each step. The demand for such Rich Media service is increasing at a high pace, spurred by the development of the next generation mobile infrastructure and the generalization of TV content to new mobile environments.
In the case of a video portal application, subscribers can watch TV, video and audio enriched with additional data (graphics, text, images) in streaming, progressive download or offline mode. DIMS provides a convenient and natural way to browse rich-media services, a web-like access (content available in less than three clicks, easy discovery, no learning curve), a permanent refresh of content through dynamic updates available on the fly and decreasing latency by allowing the visualization of data as soon as possible.
Content can be synchronized up to a frame-accurate basis (e.g. to ensure content providers and operators that voting will start and stop at a precise time during a vote within an interactive show or to allow karaoke text flows).
DIMS defines a dynamic rich-media system, including a media type, its packaging, delivery, and interaction with the local terminal, user, and other local and remote sub-systems. Enhanced end-user experiences are provided by the coordinated management and synchronization of media and events, combined with end-user interaction.
The DIMS media type can be used as a generic media type, allowing creating dynamic interactive rich-media services and can also benefit, or be used in association with other media types (e.g.: audio codecs, video codecs, XHTML browser, etc.).
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Rapporteur: David Singer |
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3GPP TS 26.233 |
SA4 |
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Transparent end-to-end packet switched streaming service (PSS) - General description |
Streaming refers to the ability of an application to play synchronised media streams like audio and video streams in a continuous way while those streams are being transmitted to the client over a data network.
Applications, which can be built on top of streaming services, can be classified into on-demand and live information delivery applications. Examples of the first category are music and news-on-demand applications. Live delivery of radio and television programs are examples of the second category.
Streaming over fixed-IP networks is already a major application today. While IETF and W3C have developed a set of protocols used in fixed-IP streaming services, no complete standardised streaming framework has yet been defined. For 3G systems, the 3G packet-switched streaming service (PSS) fills the gap between 3G MMS, e.g. downloading, and conversational services.
PSS enables mobile streaming applications, where the protocol and terminal complexity is lower than for conversational services, which in contrast to a streaming terminal require media input devices, media encoders and more complex protocols.
This TS describes the transparent 3G packet-switched streaming services (3G PSS) on a general application level.
It contains a general description of a transparent packet-switched streaming service in 3GPP-defined networks.
In particular, it defines the usage scenarios, overall high-level end-to-end service concept, and lists terminal related functional components. It also lists any identified service interworking requirements.
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Rapporteur: Harri Honko |
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3GPP TS 26.234 |
SA4 |
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Transparent end-to-end packet switched streaming service (PSS) - Protocols and codecs |
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This TS specifies the protocols and codecs for the PSS within the 3GPP system. Protocols for control signalling, capability exchange, media transport, rate adaptation and protection are specified. Codecs for speech, natural and synthetic audio, video, still images, bitmap graphics, vector graphics, timed text and text are specified.
The present document is applicable to IP-based packet-switched networks.
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Rapporteur: Olle Franceschi |
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Rapporteur: Pasi Ojala |
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3GPP TS 26.236 |
SA4 |
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Packet Switched Conversational Multimedia Applications -
Transport Protocols |
This TS
introduces the required protocols for packet switched conversational multimedia applications within 3GPP IP Multimedia Subsystem. Visual and sound communications are specifically addressed. The intended applications are assumed to require low-delay, real-time functionality.
The present document describes the required protocol related elements for 3G PS multimedia terminal:
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required SDP signalling regarding the media type bit rate, packet size, packet transport frequency;
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usage of RTP payload for media types;
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bandwidth adaptation;
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QoS negotiation.
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The present document is applicable, but not limited, to packet switched video telephony.
The applicability of the present document to GERAN is for further study.
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Rapporteur: Pasi Ojala |
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Rapporteur: Olle Franceschi |
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Rapporteur: Olle Franceschi |
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3GPP TS 26.246 |
SA4 |
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Transparent end-to-end packet switched streaming service (PSS) - 3GPP SMIL Language Profile |
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This TS includes the specification of the 3GPP SMIL Language Profile. The 3GPP SMIL Language Profile is also referred to as "3GPP PSS SMIL Language Profile" and also just "3GPP SMIL".
The 3GPP SMIL Language Profile is based on SMIL 2.0 Basic and SMIL Scalability Framework. It is a clean subset of SMIL 2.0 Full profile, and a clear superset of SMIL 2.0 Basic.
The 3GPP SMIL Language Profile is used by the PSS and MMS services.
The 3GPP SMIL Language Profile is in no way restricted to be used with only these services, but can also be used for other services.
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Rapporteur: Guido Grassel |
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3GPP TS 26.346 |
SA4 |
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MBMS Protocols and Codecs |
MBMS is a point-to-multipoint service in which data is transmitted from a single source entity to multiple recipients. Transmitting the same data to multiple recipients allows network resources to be shared.
The MBMS bearer service offers two modes:
- Broadcast Mode.
- Multicast Mode.
MBMS user services can be built on top of the MBMS bearer service. Further, the MBMS User Services may use other UMTS bearer services to deliver data. The present document specifies two delivery methods for the MBMS user services: download and streaming. Examples of applications using the download delivery method are news and software upgrades. Delivery of live music is an example of an application using the streaming delivery method.
There can be several MBMS user services. The objective of the present document is the definition of a set of media codecs, formats and transport/application protocols to enable the deployment of MBMS user services. The present document takes into consideration the need to maximize the reuse of components of already specified services like PSS and MMS.
This TS
defines a set of media codecs, formats and transport/application protocols to enable the deployment of MBMS user services either over the MBMS bearer service or other UMTS Bearer Services within the 3GPP system.
In this version of the specification, only MBMS download and streaming delivery methods are specified. The present document does not preclude the use of other delivery methods.
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Rapporteur: Igor Curcio |
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