Improving the scalability of an IMS-compliant conferencing framework through presence and event notification
Alessandro Amirante, Tobia Castaldi, Lorenzo Miniero, Simon Pietro Romano · 2007
In this article we present a thorough performance analysis of an actual implementation of a distributed conferencing framework compliant with the IP multimedia core network subsystem specification. The subject of our experimental campaign has been an architecture implemented by exploiting existing achievements in the field of conferencing. The work presented is based on the standard centralized conferencing framework defined by the IETF XCON working group, for which we recently provided an open source implementation. Starting from here, we devised a distributed conferencing solution that has been implemented as an overlay network of centralized conferencing clouds able to: (i) discover each other by means of presence mechanisms; (ii) exchange conference related information through an event notification paradigm; (iii) manage distributed conferences through out-of-band dedicated channels. The study is conducted by first measuring the main performance figures of the centralized solution and then assessing the capability of the distributed framework to improve such performance by scaling both in the number of supported users/conferences and in the overall resource consumption.