Date Added: Jun 2011
A communications network that is capable of storing packets temporarily in intermediate nodes, until the time an end-to-end route is re-established or regenerated is known as a delay tolerant network/s, in short, DTN. This paper aims to detail basic & general aspects specific to information needs in DTN routing and present classification chart. The authors start with evolution of some relevant routing objectives and issues since their inception, discuss in some detail routing types, groups and classifications. Their study culminates in identification of various schemes and techniques that will provide an insight and help one to exploit the delay and effectively utilize the time in a judicious manner to help improve the efficiency of information exchange in a DTN network.