Date Added: Mar 2010
Recently there has been much research activity in the area of Delay Tolerant Networks (DTNs). There are several different types of DTNs depending on their characteristics. Routing is one of the key components in the DTN architecture. The basic principle behind the routing protocols for DTNs is store, carry and forward. Message transmission occurs only when nodes encounter each other. Due to mobility of the nodes, the contact duration is limited. The contact duration may not be sufficient for a node to transmit all messages it has.