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Delay-tolerant Networking (DTN) enables communication in sparse mobile ad-hoc networks and other challenged environments where traditional networking fails and new routing and application protocols are required. Past experience with DTN routing and application protocols has shown that their performance is highly dependent on the underlying mobility and node(More)
Abstract movement models, such as Random Waypoint, do not capture reliably the properties of movement in the real life scenarios. We present and analyse a movement model for delay-tolerant network simulations that is able to produce inter-contact time and contact time distributions that follow closely the ones found in the traces from the real-world(More)
Powerful personal devices provide the basis for ad-hoc networking among mobile users. Delay-tolerant Networking (DTN) enables such communication in spite of low node density—to reach an infrastructure network as well as for direct information exchange between peers. Numerous DTN routing protocols have been developed, and their analysis has shown different(More)
Delay-tolerant Networking (DTN) enables communication in sparse mobile ad-hoc networks and other challenged environments where traditional networking fails and new routing and application protocols are required. Past experience with DTN routing and application protocols has shown that their performance is highly dependent on the underlying mobility and node(More)
Peer-to-Peer Session Initiation Protocol (P2PSIP) is a distributed communication system being standardized in the Internet Engineering Task Force (IETF). Since it uses the peer-topeer paradigm, P2PSIP faces the problems created by Network Address Translators (NATs); even peers located behind NATs need to be able to not only initiate connections to other(More)
Delay-tolerant networking is used for communication in challenged environments such as MANETs, in which links are unstable and end-to-end paths between communicating nodes may not exist. Messages may be significantly larger than packets in IP networks. Large messages lead to longer transfer times rendering it more likely that a link breaks in the middle of(More)
When applying delay-tolerant networking concepts to communication in mobile ad-hoc networks formed between mobile users, a general assumption is that users are willing to share own resources to support communication between others. However, we cannot assume that all users are altruistic in their behavior; instead, we have to deal with users who only make a(More)
Delay-tolerant Networking has been discussed for mobile environments, both with predictable (e.g., between buses) and unpredictable opportunistic (e.g., between people) contact schedules. While some research projects have envisioned the larger scale use of DTNs to perform message forwarding based upon social interactions between humans, the geographic(More)
We develop a new secure and energy-efficient communication model for the Constrained Application Protocol (CoAP), a light-weight communication protocol designed for smart object networks. This architecture and the communication model ensures data integrity and authenticity over a multi-hop network topology. It provides a mirroring mechanism that uses a(More)