While brute network performances increase at a raging rate and offer powerful network support for wide scale and highly performing distributed multimedia applications, end to end communication services (i.e. the transport service) offered to multimedia applications are not yet able to take into account the quality of service requirements of these new application profiles. Indeed, current transport protocols such UDP and TCP are unable to respect the time constraints which are at the core of the multimedia components semantic. This paper tackles the relevance of time in transport protocols and shows how time and synchronization constraints at application layer can be mapped onto transport layer QoS parameters that help to improve the QoS delivered to the service user.
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