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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.
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