I. Introduction
Recent studies have indicated the importance of non-voice traffic in wireless networks. In particular, data traffic, video and file sharing are increasingly dominating the mobile data traffic and they are expected to account for more than 95% of the total data traffic by 2015 [1]. Because of this trend, data dissemination has attracted great attention, especially in the context of wireless networks [2]–[6]. In such scenarios, the dissemination of a digital content constitutes the common goal of all nodes in the network.