| Conference |
| Type of Publication |
| Consistency Control for Distributed Interactive
Media |
| Title |
|
|
| Authors |
| To appear in: Proc. of the 9th ACM Multimedia, ACM
MM 2001, Ottawa, Canada, September 2001 |
| Published in |
| In this paper we present a generic
consistency control service for distributed interactive media,
i.e. media which allow a distributed group of users to interact
with the medium itself. Consistency control is vital to these
media since they typically require that a local copy of the
medium's state be maintained by each user's application. Our
service helps the applications to keep the local state copies
consistent. The main characteristics of this service are as
follows: a significant number of inconsistencies are prevented by
using a mechanism called local lag. Inconsistencies that cannot
be prevented are repaired by an improved timewarp algorithm that
can be executed locally without burdening the network or the
applications of other users. Exceptional situations and
consistency during late-join situations are supported by a
consistent state request mechanism. Moreover, the service also
supports the application in detecting intention conflicts between
the actions of distinct users. The major part of this
functionality is based on a media model and the application level
protocol for distributed interactive media (RTP/I) and can thus
be reused by arbitrary RTP/I-based applications. In order to
demonstrate the feasibility of our approach and to evaluate its
performance we have integrated the generic consistency service
into a shared whiteboard system. |
| Abstract |
|
Consistency
Distributed Interactive Media
RTP/I
Timewarp
Local Lag
Intention Conflict
Late Join
mlb
|
| Keywords |
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