An interesting article on the ION distribution of DTN: “The Interplanetary Internet Implemented on the GENI Testbed” can be found at: http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=7417313&isnumber=7416057 One of the key findings of this research was that implementing and IPN with multiple cross-links for communications to Mars would increase transmission of data by 46%!
GENI (Global Environment for Network Innovations) provides a virtual laboratory for networking and distributed systems research and education. More info available at: https://www.geni.net
Here is the abstract:
Abstract: Interplanetary Internet or Interplanetary Networking is envisaged as a space network which interconnects spacecrafts, satellites, rovers and orbiters of different planets and comets for efficient exchange of scientific data such as telemetry and images. In this paper, we implement a layout of the Interplanetary Internet (IPN) with the Interplanetary Overlay Network (ION) software module that uses Contact Graph Routing (CGR). The experiments are then implemented on the Global Environment for Network Innovations (GENI) testbed. Along with realistic contact plans (CP) of the nodes, this network implementation was used to run experiments testing the performance of Delay Tolerant Networking (DTN) with and without cross links between Mars orbiters. The experiments showed that in an Earth-Mars communication network using two Mars orbiters, allowing cross links between the orbiters results in increasing the amount of data transferred by roughly 9.2%. Data sent from Mars Rover to the Earth stations also increases by 35.7% when a third satellite (Mars Express) was added to the network without cross links. Finally, when cross links are allowed across all satellites orbiting Mars and serving as relay nodes between the Earth stations and Mars rover, the communication was enhanced by almost 46%. We conclude that by adding cross links, the performance of the network is enhanced for a better transmission of data from Mars to the Earth, which is very pertinent for the scalability of the network.