Synchronization Protocol for Real Time Multimedia in Mobile Distributed Systems
Résumé
Mobile distributed systems (MDS) deal multimedia data transmissions among geographically distributed mobile sources. In this environment, the preservation of temporal dependencies among exchanged real-time mul-timedia data is mainly affected by the asynchronous transmissions, the constantly topology changes, unpredictable delays and the lack of global references as memory and perfectly synchronized clocks. Albeit a few works are oriented to fulfill intermedia temporal dependencies, the vast majority of them do not completely support the constraints and characteristics of MDS. This paper presents a causal protocol oriented to satisfy logical and temporal dependencies among real-time multimedia data in a MDS. One of the main aspects of our protocol is the translation of temporal constraints to causal dependencies of the multimedia data using logical mapping, avoiding the use of global references. With the simulations results we demonstrate that our protocol is effective diminishing the synchronization error. Furthermore, the protocol is efficient as far as processing and storage costs at the mobile hosts, and in the overhead attached per message with a reduced usage of bandwidth across the wired and wireless channels in comparison to the Real-time Transport Protocol (RTP).
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