A Novel Group Integrity Concept for Multimedia Multicasting

Meißner, Andreas; Wolf, Lars; Steinmetz, Ralf

doi:10.1007/3-540-44763-6_25

Cited by 4 publications

(4 citation statements)

References 10 publications

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“…Moreover, no access control policies which are relevant for shared session control are defined. Only the group integrity concept [101] provides for access control based on user roles, however this project does not consider session control of recorded presentations.…”

Section: Discussionmentioning

confidence: 99%

“…In [101] a concept for so-called group integrity for multimedia multicasting has been proposed. Conditions for group integrity comprise requirements for group membership, member roles and group organization.…”

Section: Group Management In Streaming Architecturesmentioning

confidence: 99%

“…In shared workspaces or video-conferencing, this state is restricted on policies for the floor management, which are given by the implemented floor control protocol. For the Group Integrity project [101], a well-defined notion of group state is used in combination with streaming. However, the architecture is built to support multicast delivery of live presentations and, therefore, does not consider control operations like pausing.…”

Section: Characteristics Of Related Approachesmentioning

confidence: 99%

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Collaborative media streaming

Kahmann¹,

Wolf

Ott

2009

SIGMultimedia Rec.

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At the time being, multimedia services using IP technology are a hot topic for network and service providers. Examples are IPTV, which stands for television broadcast over a (mostly closed) network infrastructure by means of the IP suite, or video on-demand, which allows for watching selected movies via Internet on TV devices or computers in the home. Technically, these services can be classified under the notion of streaming. A server sends media data in a continuous fashion to one or several clients, which consume data portions as soon as they arrive, mostly displaying them also. By using a feedback channel customers may influence the play-back, since they may watch programs time-shifted or pause the program. An enhancement of such streaming services is to watch those movies together with a group of people on several devices in parallel, independent from the location of the other group members. Similar approaches have been developed using IP multicast, for example for distributing lectures or conference talks to a group of listeners. However, users cannot control the presentation: pausing or skipping of more unimportant parts is impossible. Moreover, the streaming presentation is announced by means outside the application instead of adding others to the session directly within the application. The costream architecture developed in this works offers a collaborative streaming service without these limitations: People may retrieve movies, join others watching a movie or invite others to such a collaborative streaming session. Participants of a collaborative streaming session can control the movie presentation like they do on a DVD player. Dependent on the desired course of the session the control operation is executed for all users, or the group is split into subgroups to let watchers follow their own time-lines. For this, a group management controls access to session control operations by means of user roles. Separate from the group management, the so-called association service provides for streaming session control and synchronization among participants. This separation of duties is advantageous in the sense that standard components can be used: For group management, SIP conferencing servers are suitable, whereas session control can best be handled using RTSP proxies as already used for caching of media data. Eventually, the evaluation of this architecture shows that such a service offers both low latency for clients and an acceptable synchronization of media streams to different client devices. Moreover, the communication overhead compared to usual conferencing or streaming systems is very low.

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Section: Discussionmentioning

confidence: 99%

Section: Group Management In Streaming Architecturesmentioning

confidence: 99%

Section: Characteristics Of Related Approachesmentioning

confidence: 99%

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Collaborative media streaming

Kahmann¹,

Wolf

Ott

2009

SIGMultimedia Rec.

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“…Associated action policies state how to re-establish integrity in case it has been found violated. In GCAP's multimedia multicasting context, we apply an adapted version of the framework in [12] to SSM channels and multimedia sessions.…”

Section: Channel and Session Integritymentioning

confidence: 99%

GCAP: A New Multimedia Multicast Architecture for QoS

Diaz

Canonico

Costa

et al. 2001

Protocols for Multimedia Systems

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Despite its obvious suitability for distributed multimedia applications, multicasting has not yet found widespread application. Having analyzed shortcomings of today's approaches, we devise in the GCAP project a new endto-end transport architecture for multimedia multicasting that supports partial order and partial reliability. In this paper, we argue that, at the network layer, single-source multicasting (PIM-SSM) should be chosen. Consequently, our Monomedia Multicast protocol provides, along with reliability and QoS monitoring functionality, an ALM based multicast solution referred to as TBCP (Tree Building Control Protocol), to be used as back channel for SSM, e.g. for retransmission requests. On top of the Monomedia protocol, our Multimedia Multicast protocol handles multimedia sessions composed of multiple monomedia connections: The FPTP (Fully Programmable Transport Protocol) allows applications to specify, through its API, the (global) synchronization and (individual) reliability requirements within a multimedia session. Our group management approach is focused on group integrity.

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