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2011
Conference Paper
Titel
Architecture for asymmetric P2P group communication
Abstract
In asymmetric group communication, active participants create the multimedia content, while the dormant/passive participant interactively consumes it. This use-case is visible in remote teaching, seminars and conferences. Asymmetric group communication imposes strict timing requirements that directly impact on the Quality of Service (QoS). We use Application Layer Multicast (ALM) to disseminate media from the active speaker to all other conference participants. The ALM tree network minimizes the end-to-end (e2e) delay and reduces the load on the active participants. We propose a system that enables the setup of an asymmetric group communication system using the SIP 3rd party call control (3PCC) mechanism. This facilitates the negotiation and setup of the forwarding relationships between peers to distribute media to all conference participants. We evaluate the maximum outage caused by tree reconstruction and provide a mechanism to make it performant.