A generic late-join service for distributed interactive media

Abstract
In this paper we present a generic late join service for distributed interactive media, i.e. networked media which involve user interactions. Examples for distributed interactive media are shared whiteboards, networked computer games, and distributed virtual environments. The generic late join service allows a late comer to join an ongoing session. This requires that the shared state of the medium is transmitted from the old participants of the session to the late comer in an efficient and scalable way. In order to be generic and useful for a broad range of distributed interactive media, the late join service is based on the Real Time Application Level Protocol for Distributed Interactive Media (RTP/I). All applications which employ this protocol can also use the generic late join service. Furthermore the late join service can be adapted to the specific needs of a given application by specifying policies for the late join process

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