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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.V1User nodes reside at the periphery of the SSI and have the ability to access SSIservices, but do not have the capability to provide network-layer forwardingfunctionality (i.e., store-and-forward capability, potential support for multiplesimultaneous links, etc.). User nodes can use SSI services, but cannot provide SSIservices for other nodes. A terrestrial Internet analogy for an SSI user node is thecomputer belonging to an individual Internet user, who is accessing services offeredby a local Internet Service Provider.Provider nodes have the ability to offer network-layer routing and forwardingcapabilities. Such nodes can perform routing over one or more links, have store-andforwardcapability, and may support multiple simultaneous links to enablesimultaneous support to multiple user nodes and/or real-time forwardingfunctionality. These nodes act as intermediate relay nodes for end-to-end networkservices. Provider nodes offer standardized service interfaces to provide networkfunctionality to SSI users. They can connect to any other peer network serviceprovider nodes using standard peering protocols to exchange user data, as well asrouting and other management information. When it is acting as the terminus of anSSI service, a provider node functions like a user node. Examples of a provider nodeacting as a user node include a hybrid science/telecommunications orbiter that istransmitting its own science telemetry, or a dedicated telecommunications orbiterthat is sending or receiving data related to its own spacecraft operations.Just as in the terrestrial Internet, user nodes must implement an agreed minimum set ofstandard protocols, and the SSI provider nodes must offer the agreed set of standardservices for routing, staging, and forwarding data. There will be procedures for adding anew user node to (or deleting it from) the SSI, for requesting services, and for inserting anew SSI provider node into (or removing it from) the network.2.3 Definition of the SSI NodesNote that for purposes of this document, Earth is treated separately from the other planets,and the term “planet” is extended to mean any other Solar System body (moon, asteroid,comet, etc.) that is being investigated.Figure 2-1 shows the types of SSI nodes, each of which is described in detail in subsequentsubsections. Lines between the SSI nodes indicate potential communications paths; actualpaths will depend upon the location of the nodes and individual node capabilities.Page | 12

Operations Concept for a Solar System Internetwork (SSI)IOAG.T.RC.001.V12.3.1 SSI Provider NodesFigure 2-1: SSI NodesSSI provider nodes are a set of interconnected elements that work together to provide endto-endcommunications services for mission users (user nodes). It is the fundamentalprecept of the SSI that all provider nodes be equipped to use the internet protocol of the IPsuite and/or DTN Bundle Protocols (BP) as the basis for network-layer connectivity, and thatthey route data in the form of IP datagrams and/or BP bundles. The following subsectionsdescribe types of SSI provider nodes.2.3.1.1 Earth Station (e.g., Earth-space link terminals or ground stations)An Earth Station provides network-layer connectivity over a space link to route trafficbetween a Terrestrial Wide Area Network (WAN) and space or planetary SSI nodes. In thecontext of the SSI, the Earth Station establishes and maintains link-layer and networkconnections with other provider nodes (e.g., Relay Spacecraft, Planetary Stations) anddirectly with user nodes (either user spacecraft or landed assets).2.3.1.2 Relay SpacecraftThe Relay Spacecraft performs routing and storage functions over multiple space links (e.g.,Advanced Orbital Systems [AOS]/Telemetry [TM]/Telecommand [TC], Proximity-1). In thecontext of the SSI, a Relay Spacecraft may establish space links with other provider nodesPage | 13

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