Title: Analysis on Floor Control for Multimedia Conferencing Systems
Abstract:Active members within a multimedia conference need cooperation to decide who can send data to the session, and this mechanism is called Floor Control. As one of the key factors of conference control, ...Active members within a multimedia conference need cooperation to decide who can send data to the session, and this mechanism is called Floor Control. As one of the key factors of conference control, floor control can affect the quality of conference directly. In this paper, we propose a general floor control protocol (GFCP) based on the typical behavior abstracted from some floor control protocols in the literature. Compared with other existing floor control protocols, GFCP has three typical features: it is an application layer protocol and is independent on the underlying transport services, so it is more flexible; it is a logically correct protocol, that is, there are no live lock and dead lock within the protocol interaction behaviors; it is a reliable application protocol, although it is based on the best effort Internet services. GFCP can also be used both on concentrated cooperation applications and distributed cooperation applications. The protocol is designed to use only the basic IP service and its implementation can be integrated with conference control protocols. In order to validate the logical correctness and reliability of GFCP, we use formal method, namely communicating sequential processes (CSP), to describe the protocol behaviors. The basic CSP model proposed by Hoare is powerful enough to describe and validate the logical correctness of GFCP, but less enough to validate the reliability of GFCP. So the extended CSP, named probability CSP (PCSP), is introduced in the protocol description. We also introduce a lossy channel model in the protocol interactions to emulation a real network circumstance. And the protocol still keeps its logical correctness after the introduction of lossy model and PCSP. Finally, a simple implementation framework of GFCP based on session control and media control is proposed, and the analysis of real time, fairness and scalability are also presented.Read More
Publication Year: 2001
Publication Date: 2001-01-01
Language: en
Type: article
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Cited By Count: 5
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