Delay tolerant mobile networks feature with intermittent connectivity, huge transmission delay, nodal mobility, and so forth. ?ere\r\nis usually no end-to-end path in the networks and it poses great challenges for routing in DTMNs. In this paper, the architecture\r\nof DTMNs is introduced at ??rst, including the characteristics of DTMNs, routing challenges, and metric and mobility models.\r\nAnd then, the state-of-the-art routing protocols for DTMNs are discussed and analyzed. Routing strategies are classi??ed into three\r\ncategories: nonknowledge-based approach, knowledge-based approach, and social-based approach. Finally, some research issues\r\nabout DTMNs are presented.
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