Mobile devices in Opportunistic Networks are used and carried by people, whose social behaviors and characteristics can greatly improve the routing performance. However, most routing protocols resort mere to the state information, including the contact history or the social feature of nodes, to assist the relay selections. In fact, node's vicinity is considered to achieve optimal selection of relay. In this paper, we propose a new method of social group formation and an enhanced social group-based routing in which the relay node is selected bas...
