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....2: Routing Protocols General Terms: Algorithms, Performance Keywords: Routing, Delay Tolerant Network 1. INTRODUCTION In this work, we look at the problem of routing in a delay tolerant network (DTN)=-=[8]-=-. Such networks are assumed to experience frequent, long-duration partitioning and may never have an end-to-end contemporaneous path. This problem contrasts with routing in conventional data networks ...

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...wever, its focus on static sensors and data collection applications differs from the MF schemes. In addition, the MF schemes explicitly utilize non-random or controlled movement to deliver data. Fall =-=[11]-=- proposes a Delay-Tolerant Network (DTN) architecture to interconnect challenged networks such as sensor networks and interplanetary networks. In many challenged networks, endto-end paths might not ex...

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...l or organizational semantics. 4 CafNet offers a message-oriented data transmission and reception API to applications, not a streamoriented connection abstraction like TCP. As previous work has shown =-=[10, 19]-=-, a message abstraction is better suited to a network whose delays could be minutes or hours. The unit of data transport in CafNet is an Application Data Unit (ADU) [15]. Each ADU has an identifier; t...

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...tivity to its neighboring RH is intermittent, it can choose to accept custody of the subsequent transfer in much the same way as it places itself on the return path for caching. Previous work on DTNs =-=[12]-=- has also embraced name-based routing. Though these two uses of name-based routing are realized somewhat differently, the similarity in approaches suggests that DONA might provide a reasonable substra...

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...mmunity, Centrality 1. INTRODUCTION We envision a future in which a multitude of devices carried by people are dynamically networked. We aim to build PSN [10]: a type of Delay Tolerant Networks (DTN) =-=[6]-=- for such environments. A PSN uses contact opportunities to allow humans to communicate without network infrastructure. 1 We require an efficient data 1 Regarding the motivations of PSN, there is a hu...

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...dressed various communication environments where standard Internet protocols would be difficult to use or would provide very poor performance, e.g. networking using buses following predictable routes =-=[2]-=-, interplanetary networking [3], interfacing with sensor networks [4], and using mobile nodes to bridge data between remote village networks and the Internet [5, 6]. Another scenario in which DTN can ...

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... in application defined data units (ADUs.) The exact nature of this interface is an important area for future exploration. Recent work on delay-tolerant networks can inform the design of such a stack =-=[8, 17, 21, 22, 12]-=-. 6.3 Fast, Friendly Connection Establishment Regardless of whether such networks are continuous or intermittent, an essential feature of future network stacks tuned for these mobile environments is t...

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...in [24]; in this paper the authors investigate the similarities between floodingbased approaches for the information dissemination in mobile ad-hoc networks and the epidemic spreading of diseases. In =-=[25]-=-, Fall proposes the Delay Tolerant Network architecture to solve the internetworking issues in scenarios where partitions are frequent and a connected path between message senders and receivers may be...

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... time, as excessive MAC-level contention wastes bandwidth and energy. Instead we will explore explicit application-level data caching and forwarding. Building on the work of Delay Tolerant Networking =-=[15]-=-, we plan to package sensor network readings and pass them from sensor node to sensor node. While DTN outlines a generic architecture for store-andforward data delivery, our seismic imaging applicatio...