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SISG Operations Concept for SSI - InterPlanetary Networking ...

SISG Operations Concept for SSI - InterPlanetary Networking ...

Operations Concept for a Solar System Internetwork (SSI)IOAG.T.RC.001.V1(e.g., Earth Stations, other Relay Spacecraft, Planetary Stations) and directly with user nodes(either user spacecraft or landed assets).Some Relay Spacecraft will be Hybrid Relay Orbiters whose main mission may be thecollection of science data, but which have the capability to serve as SSI provider nodes, aswell. Depending on resource availability, season, geometry, flexibility of pointing andplanning, Hybrid Relay Orbiters may be able to perform science-related activities andsupport the SSI provider node role. Often, however, the ability of Hybrid Relay Orbiters tosupport relay operations may be constrained due to science-driven orbits, limited resources,science-driven pointing constraints, body fixed or omni antennas for proximity operations,etc. Once their science operations requirements are satisfied, some Hybrid Relay Orbitersmay be granted an extended mission, during which time they may serve as dedicated SSIprovider nodes.2.3.1.3 Planetary Station (e.g., planet-Space Link Terminal)A Planetary Station is essentially the same as an Earth Station. It provides the space linkover which traffic is routed between a Planetary WAN and space or terrestrial SSI nodes. Inthe context of the SSI, the Planetary Station establishes and maintains link-layer andnetwork connectivity with other provider nodes (e.g., Relay Spacecraft, Earth Stations) anddirectly with user nodes (either user spacecraft or landed assets). An example of a PlanetaryStation would be a fixed terminal on the lunar surface at the site of a human outpost,providing communication services to proximate users, as well as dedicated high-rate links tolunar relay spacecraft and/or Earth Stations.2.3.1.4 Terrestrial Wide Area NetworksA Terrestrial WAN is a network of nodes that provides network-layer connectivity amongterrestrial SSI user nodes and Earth Stations to support the exchange of data.2.3.1.5 Planetary Wide Area NetworksA Planetary WAN is essentially the same as a terrestrial WAN. It provides network-layerconnectivity among planetary SSI user nodes and Planetary Stations to support theexchange of data.2.3.2 SSI User NodesUser nodes are the entities served by the SSI. As in a terrestrial network, any SSI user nodemay communicate with any other SSI node by routing data to its unique end-point address.One or more of the SSI provider nodes will enable such communications. Some user nodesperform functions necessary to the operation of the SSI (e.g., coordinating or operating SSIprovider nodes), but are considered user nodes since they do not have the capability toprovide full network-layer routing and forwarding functionality. Individual SSI user nodeswill access the SSI using the internet protocol of the IP suite and/or the bundle protocol ofthe DTN suite.The following subsections describe types of SSI user nodes.2.3.2.1 SpacecraftSpacecraft user nodes may be located either in space or landed on a planet (rover orlander). A Hybrid Relay Orbiter spacecraft acts as a user node when it transmits its ownPage | 14

Operations Concept for a Solar System Internetwork (SSI)IOAG.T.RC.001.V1science telemetry or sends or receives data related to its own spacecraft operations. (Thisdocument discusses the case of a single user node on the spacecraft. In general, one couldenvision multiple user nodes on a spacecraft corresponding to individual payload andinstrument processors.) For the purposes of this SSI Operations Concept, the notion of“spacecraft” encompasses the full range of potential user platforms including launchvehicles, orbiters, landers, airborne vehicles, etc.2.3.2.2 Spacecraft Mission Operations CenterThe Spacecraft MOC is in charge of operating one or more spacecraft missions (spaceborneor landed). The Spacecraft MOC uses the SSI to communicate with its spacecraft. UserSpacecraft MOCs operate one or more user spacecraft, and Provider Spacecraft MOCsoperate one or more Relay Spacecraft. A Provider Spacecraft MOC ensures that theinternetworking and relay functions of the satellite(s) it is operating are available and thatthose satellites perform according to the service commitments made. In the case of aHybrid Relay Orbiter, the Provider Spacecraft MOC might be a separate physical entity or itmight be part of the mission’s User Spacecraft MOC. In some cases, a Spacecraft MOC mayact as a provider node for a separate science operations center or science investigator (seeSection 2.3.2.5 on the Science Operations Center).2.3.2.3 Earth Station Control CenterAn Earth Station Control Center will be responsible for preparing, controlling, andmonitoring one or more Earth Stations and the ground-based communications related tothose stations. An Earth Station Control Center might not be collocated with the EarthStation(s) it operates. The Earth Station Control Center will coordinate use of such stations,often supplying the service management interfaces used to plan, schedule, and requestEarth Station services. Agencies coordinate with each other to provide cross-supportservices through their respective Earth Stations.2.3.2.4 Planetary Station Control CenterA Planetary Station Control Center will be responsible for preparing, controlling, andmonitoring one or more Planetary Stations and the planet-based communications related tothose stations. A Planetary Station Control Center might not be collocated with thePlanetary Station(s) it operates. The Planetary Station Control Center will coordinate use ofsuch stations, often supplying the service management interfaces used to plan, schedule,and request Planetary Station services. Agencies coordinate with each other to providecross-support services through their respective Planetary Stations.2.3.2.5 Science Operations CenterA Science Operations Center may be responsible for controlling and monitoring individualscience instruments, as well as the reception and possible distribution of science data. AScience Operations Center may not be collocated with the MOC that operates thespacecraft housing the instruments. At the SSI conceptual level, the Science OperationsCenter is seen as a terminal entity issuing payload requests and recovering the final sciencedata. Whether this Science Operations Center is a dedicated institution in one physicalplace, or instead exists as a network of science institutes and principal investigatorsinterfacing with the MOC is not relevant to the SSI operation.Page | 15

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