D. Komosny, R. Burget, and V. Notovny
Multicast, one-to-many, RTCP, feedback, IPTV
ASM (Any Source Multicast) and SSM (Source-Specific Multicast) are the two types of multicast used in IP-based networks. SSM is expected to cover all types of multime dia sessions with many receivers and only one source, such as IPTV broadcasting. The paper describes simula tion tools for IPTV broadcasting systems with millions of subscribes. These numbers of receivers are expected when the IPTV technology will is available and affordable for the majority of TV stations. The aim of these simulations is to estimate the whole communication system behaviour, in particular the time requirements to transmit the feed back information from receivers to the source. The feed back from receivers is used by the media source, for ex ample, for the parameterization of a multicast forward er ror correction (FEC) algorithm or the tuning of audio sup pression algorithms. The feedback transmitted usually contains information about the synchronization of trans mitted media (audio, video), packet loss, packet delays, and jitter. The simulation tools presented below are an SSM multicast model developed in SDL (Specification and Description Language) and an IPTV client/server ap plication, which allows creating virtual clients to obtain the required number of receivers.
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