IEEE Copyright Notice

This material is presented to ensure timely dissemination of scholarly and technical work. Copyright and all rights therein are retained by authors or by other copyright holders. All persons copying this information are expected to adhere to the terms and constraints invoked by each author's copyright. In most cases, these works may not be reposted without the explicit permission of the copyright holder.

ACM Copyright Notice

These are the authors' versions of the work. The copyright is with ACM. They are posted here by permission of ACM for your personal use. Not for redistribution. See individual publication details for information on the publication of the definitive versions.

Springer-Verlag LNCS Copyright Notice

The copyright of these contributions has been transferred to Springer-Verlag Berlin Heidelberg New York. The copyright transfer covers the exclusive right to reproduce and distribute the contribution, including reprints, translations, photographic reproductions, microform, electronic form (offline, online), or any other reproductions of similar nature. Online available from Springer-Verlag LNCS series.

Work that appeared before the 1st of September 2003 was published while the authors were with the Lehrstuhl Praktische Informatik IV at the University of Mannheim.

Consistency Control for Distributed Interactive Media

Author(s): Jürgen Vogel, Martin Mauve.
Title: Consistency Control for Distributed Interactive Media
Published: Proc. of the 9th ACM Multimedia, ACM MM 2001, pp. 221-230, Ottawa, Canada, September 2001
Keyword(s): Consistency, Distributed Interactive Media, RTP/I, Timewarp, Local Lag, Intention Conflict, Late Join, mlb
Abstract: In this paper we present a generic consistency control service for distributedinteractive media, i.e. media which allow a distributed group of users to interactwith the medium itself. Consistency control is vital to these media sincethey typically require that a local copy of the medium's state be maintainedby each user's application. Our service helpsthe applications to keep the local state copies consistent. The maincharacteristics of this service are as follows: a significant number ofinconsistencies are prevented by using a mechanism called local lag. Inconsistenciesthat cannot be prevented are repaired by an improved timewarp algorithm thatcan be executed locally without burdening the network or the applications ofother users. Exceptional situations and consistency during late-join situationsare supported by a consistent state request mechanism. Moreover, the servicealso supports the application in detecting intentionconflicts between the actions of distinct users. The major partof this functionality is based on a media model and the applicationlevel protocol for distributed interactive media (RTP/I) and can thus be reusedby arbitrary RTP/I-based applications. In order to demonstrate the feasibilityof our approach and to evaluate its performance we have integrated the genericconsistency service into a shared whiteboard system.
Bib entry: [XML] [BibTeX]
Download: [PDF]
Verantwortlich für den Inhalt: E-Mail sendenWE Informatik