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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.V1The SSI will be operated by different space agencies, requiring a level of integration basedon architectural agreements that provide engineering coherence. These agreements willguide:1. Procedures for assigning unambiguous identifiers (naming and addressing)2. Methods that assure integrated, but private, data flows for multiple missions3. Interoperable mechanisms for SSI network monitor and control4. Collaborative scheduling procedures that maximize the utility of the confederatedSSI, while respecting the terms of cross-support agreements among contributingagenciesIn the evolutionary phase any “peering” agreements are expected to be documented on amission-by-mission, interface-by-interface basis.4.2 SSI Contact Planning ProcessThe need to schedule space links will not be eliminated by the evolution to aninternetworked architecture. In fact, in the SSI architecture, management of the networkcontact plan becomes an essential aspect of operations. SSI contact planning involvesdetermining mutual contact opportunities, producing an agreed-upon contact plan,disseminating the contact plan to participating SSI nodes, and monitoring and reporting onnetwork utilization. Routing (determining the path to send the data) may be static(predetermined or managed) or it may entail contact graph routing, which involvesunderstanding and exchanging the temporal aspects (contact times, one-way light time) andresources (e.g., storage and link capacity) for nodes participating in the SSI.Since the provider node loading, service demands, communication opportunities, andcommunication geometry of the SSI are continually changing, contact planning will be acyclical process, as illustrated in Figure 4-2.Page | 26

Operations Concept for a Solar System Internetwork (SSI)IOAG.T.RC.001.V1•Space link performanceextraction•Network data volume andlatency calculations, reportsMutualContactDetermination•Trajectory predictions•Communications geometry•Spacecraft constraintsNetworkUtilization,Monitoring,ReportingContact PlanGenerationContact PlanRelease +Verification (ofRelease)Figure 4-2: SSI Contact Planning Process OverviewDuring the evolutionary phase, the Provider MOC and User MOC will negotiate directly toconduct the contact planning process. Provider MOCs may have to negotiate with morethan one User. Similarly, any given User MOC may require services from and need tonegotiate with more than one Provider MOC. As more nodes are involved, scheduling andcoordinating will become exponentially more difficult.In the SSI environment, the traffic borne by a space link at any given time will no longer beconstrained to a single spaceflight mission. Space links may be concurrently shared amongmissions. Contact Plans will be generated via a multiagency collaborative process, and willbe used for real-time routing of IP packets and/or DTN bundles across a time-varyingcollection of links and nodes, but the establishment of those links and nodes is aprerequisite. Once these layer-2 links are established, all network data that can efficientlyuse the available link will be flowed toward its destination, subject to priorities and otherpolicies.4.2.1 Mutual Contact DeterminationThe first phase in configuring the SSI to support user missions is mutual contactdetermination. Trajectory prediction information, overlaid with spacecraft operationalconstraints that affect communications, will be used to determine mutual contactopportunities.Page | 27

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