Cooperative control of multicast-based streaming on-demand systems

A hierarchical control protocol for group-oriented playbacks supported by content distribution networks

“…To improve performance of MACp and SSAC, the COoperative Control protocol (COCOP) introduced an implicit coordination mechanism among clients which allows a client to refrain from issuing a control request after sensing that another client has issued a control request (Fortino et al, 2005).…”

“…Afterwards it enters the ProcessDone state wherein it rests until a given time T CPCS elapses. In particular a timer FTimer, whose setting is detailed in Section 4.2, is introduced both to make the clients aware of all changes in the session state, thus exploiting a soft state like paradigm (Fortino et al, 2005;Raman and McCanne, 1999), and to regulate the group interactivity.…”

“…Moreover, the performances are compared with those obtainable with a centralized architecture which exploits the basic COCOP protocol (Fortino et al, 2005). The centralized architecture employed, hereby referred to as ''Star'', is representative of existing collaborative playback architectures which have a centralized nature, as control messages are processed by a single server entity (see Section 2).…”

“…In particular, the paper proposes the Hierarchical COoperative COntrol Protocol (HCOCOP) which is an extension of the COoperative COntrol Protocol (COCOP) for CDN-based media steaming architectures (Fortino et al, 2005).…”