Presence information distribution in the P2P overlay using ALTO service

Abstract

In this paper, we propose a delegating mechanism to distribute the presence information among watchers in the P2P overlay. Our approach is to take advantage of the network topology knowledge provided by the ALTO service to perform the optimization algorithm at the Presence Server (PS) in order to reduce its burden as well as keep watchers' delays in receiving the notification message at acceptable values. The performance is evaluated over the basic P2PSIP system and the outcomes prove that our solution can degrade significantly the PS's load even for the ever-increasing number of subscribers. © 2012 Springer-Verlag.