05142 Abstracts Collection -- Disruption Tolerant Networking

From 03.04.05 to 06.04.05, the Dagstuhl Seminar 05142 ``Disruption Tolerant Networking\u27\u27 was held in the International Conference and Research Center (IBFI), Schloss Dagstuhl. During the seminar, several participants presented their current research, and ongoing work and open problems were discussed. Abstracts of the presentations given during the seminar as well as abstracts of seminar results and ideas are put together in this paper. The first section describes the seminar topics and goals in general. Links to extended abstracts or full papers are provided, if available

Delay and Disruption Tolerant Networking MACHETE Model

To verify satisfaction of communication requirements imposed by unique missions, as early as 2000, the Communications Networking Group at the Jet Propulsion Laboratory (JPL) saw the need for an environment to support interplanetary communication protocol design, validation, and characterization. JPL's Multi-mission Advanced Communications Hybrid Environment for Test and Evaluation (MACHETE), described in Simulator of Space Communication Networks (NPO-41373) NASA Tech Briefs, Vol. 29, No. 8 (August 2005), p. 44, combines various commercial, non-commercial, and in-house custom tools for simulation and performance analysis of space networks. The MACHETE environment supports orbital analysis, link budget analysis, communications network simulations, and hardware-in-the-loop testing. As NASA is expanding its Space Communications and Navigation (SCaN) capabilities to support planned and future missions, building infrastructure to maintain services and developing enabling technologies, an important and broader role is seen for MACHETE in design-phase evaluation of future SCaN architectures. To support evaluation of the developing Delay Tolerant Networking (DTN) field and its applicability for space networks, JPL developed MACHETE models for DTN Bundle Protocol (BP) and Licklider/Long-haul Transmission Protocol (LTP). DTN is an Internet Research Task Force (IRTF) architecture providing communication in and/or through highly stressed networking environments such as space exploration and battlefield networks. Stressed networking environments include those with intermittent (predictable and unknown) connectivity, large and/or variable delays, and high bit error rates. To provide its services over existing domain specific protocols, the DTN protocols reside at the application layer of the TCP/IP stack, forming a store-and-forward overlay network. The key capabilities of the Bundle Protocol include custody-based reliability, the ability to cope with intermittent connectivity, the ability to take advantage of scheduled and opportunistic connectivity, and late binding of names to addresses

On Applications of Disruption Tolerant Networking to Optical Networking in Space

The integration of optical communication links into space networks via Disruption Tolerant Networking (DTN) is a largely unexplored area of research. Building on successful foundational work accomplished at JPL, we discuss a multi-hop multi-path network featuring optical links. The experimental test bed is constructed at the NASA Glenn Research Center featuring multiple Ethernet-to-fiber converters coupled with free space optical (FSO) communication channels. The test bed architecture models communication paths from deployed Mars assets to the deep space network (DSN) and finally to the mission operations center (MOC). Reliable versus unreliable communication methods are investigated and discussed; including reliable transport protocols, custody transfer, and fragmentation. Potential commercial applications may include an optical communications infrastructure deployment to support developing nations and remote areas, which are unburdened with supporting an existing heritage means of telecommunications. Narrow laser beam widths and control of polarization states offer inherent physical layer security benefits with optical communications over RF solutions. This paper explores whether or not DTN is appropriate for space-based optical networks, optimal payload sizes, reliability, and a discussion on security

Sistema de distribución del cambio de estado de semáforos hacia vehículos a través de una red oportunista

Actualmente, una gran cantidad de marcas automovilísticas y centros de investigación trabajan en el diseño y la fabricación de vehı́culos autónomos. Estos vehı́culos toman decisiones a partir de cámaras y sensores. En este trabajo se plantea crear un entorno que, mediante la utilización de redes tipo Delay and Disruption Tolerant Networking, proporcione información a los vehı́culos sobre el estado de los semáforos que se van a encontrar. Para ello, los semáforos envían la información solicitando que sea propagada por los vehículos que puedan estar dirigiéndose hacia los semáforos.Nowadays, many automobile brands and research centers work in the design and manufacture of autonomous vehicles. These vehicles make decisions from cameras and sensors. This article proposes to create an environment that provides information to vehicles Delay and Disruption Tolerant Networking (DTN). The main idea is to transmit the information of the change of state of the traffic lights to vehicles. In addition, it is suggested that vehicles can communicate with each other using DTN.Actualment, una gran quantitat de marques automobilístiques i centres d'investigació treballen en el disseny i la fabricació de vehicles autònoms. Aquests vehicles prenen decisions a partir de càmeres i sensors. En aquest treball es planteja crear un entorn que, mitjançant la utilització de xarxes tipus Delay and Disruption Tolerant Networking, proporcioni informació als vehicles sobre l'estat dels semàfors que es troben pel camí. Per a fer-ho possible, els semàfors envien la informació demanant que sigui distribuïda pels vehícles que poden estar anant cap als semàfors

SocialDTN: A DTN implementation for Digital and Social Inclusion

Despite of the importance of access to computers and to the Internet for the development of people and their inclusion in society, there are people that still suffer with digital divide and social exclusion. Delay/Disruption-Tolerant Networking (DTN) can help the digital/social inclusion of these people as it allows opportunistic and asynchronous communication, which does not depend upon networking infrastructure. We introduce SocialDTN, an implementation of the DTN architecture for Android devices that operates over Bluetooth, taking advantages of the social daily routines of users. As we want to exploit the social proximity and interactions existing among users, SocialDTN includes a social-aware opportunistic routing proposal, dLife, instead of the well-known (but social-oblivious) PROPHET. Simulations show the potential of dLife for our needs. Additionally, some preliminary results from field experimentations are presented.Comment: 3 pages, 4 figure

Probabilistic Routing Protocol for Intermittently Connected Networks

This document is a product of the Delay Tolerant Networking Research Group and has been reviewed by that group. No objections to its publication as an RFC were raised. This document defines PRoPHET, a Probabilistic Routing Protocol using History of Encounters and Transitivity. PRoPHET is a variant of the epidemic routing protocol for intermittently connected networks that operates by pruning the epidemic distribution tree to minimize resource usage while still attempting to achieve the best-case routing capabilities of epidemic routing. It is intended for use in sparse mesh networks where there is no guarantee that a fully connected path between the source and destination exists at any time, rendering traditional routing protocols unable to deliver messages between hosts. These networks are examples of networks where there is a disparity between the latency requirements of applications and the capabilities of the underlying network (networks often referred to as delay and disruption tolerant). The document presents an architectural overview followed by the protocol specification

NASA ION (Interplanetary Overlay Network) Developer Course Materials

The Delay/Disruption Tolerant Networking Project created open-source software, the Interplanetary Overlay Network (ION), as an implementation of the Bundle Protocol. To aid users in understanding the architecture of ION and how best to use it, the DTN Project developed a course

09071 Abstracts Collection -- Delay and Disruption-Tolerant Networking (DTN) II

From 08.02. to 11.02.2009, the Dagstuhl Seminar 09071 ``Delay and Disruption-Tolerant Networking (DTN) II \u27\u27 was held in Schloss Dagstuhl~--~Leibniz Center for Informatics. During the seminar, several participants presented their current research, and ongoing work and open problems were discussed. Abstracts of the presentations given during the seminar as well as abstracts of seminar results and ideas are put together in this paper. The first section describes the seminar topics and goals in general. Links to extended abstracts or full papers are provided, if available