Satellite Networks

DTN concept in space networks

     Each node of the DTN architecture can store information for a long time before forwarding it. Thanks to these features, a DTN is particularly suited to cope with the challenges imposed by space communication over the network with intermittent connectivity (visibility) and random interruptions between the nodes. The DTN concept lies in a generalization of requirements identified for interplanetary networking (IPN), where latencies that may reach the order of tens of minutes, as well as limited and highly asymmetric bandwidth, must be faced. Delays and disruptions can be handled at each DTN hop in a path between a sender and a destination. Nodes on the path can provide the storage necessary for data in transit before forwarding it to the next node on the path. In consequence, the contemporaneous end-to-end connectivity that Transmission Control Protocol (TCP) and other standard Internet transport protocols require in order to reliably transfer application data is not required. In practice, in standard TCP/IP networks, which assume continuous connectivity and short delays, routers perform nonpersistent (short term) storage and information is persistently stored only at end nodes. In DTN networks, information is persistently (longterm) stored at intermediate DTN nodes. This makes DTNs much more robust against disruptions, disconnections, and node failures.         

  INS provides designs for satellite constellation optimization that minimize latency in the network with minimum number of satellites in the orbit. In adition to providing the most economical solutions, for minimum latency in the network, this also sllows down the problem of building up the “basura espacial” which has been already recognized as a problem of the future explaration of the space

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It is time to take the responsibility within our own profession for the future state of the space rather than to wait for warnings from Hollywood or future Green Space movements and parties.  

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