[Sis-mia] Review SIS Strategic Plan

[Scott, Keith L.]

All,

Below is the SIS Strategic Plan.  If you have any comments or suggestions, please reply to this email and we can discuss.  Note that this is the SIS AREA strategic plan, and should be overall, long-term planning without getting into document-by-document details.


SPACE INTERNETWORKING SERVICES AREA
The objective of the SIS area is to address the communications services and protocols supporting end-to-end communications among applications, particularly where those communications may span multiple heterogeneous physical and data link technologies. Areas addressed by SIS include the networking infrastructure to support application-to-application communication onboard a single spacecraft, communications among multiple spacecraft, and communications between space-based applications and their counterparts on Earth and/or other planetary bodies.

The SIS area deals with communication services and protocols that are independent of specific link technology (as a lower layer bound) and independent of application-specific semantics (as an upper bound). Thus the SIS area covers essentially the Network through Application Layers of the OSI reference model.

SIS protocols use the underlying communication and infrastructure services provided by the SLS and SOIS areas and any other onboard networks, and provide the networked connectivity needed by applications developed in other CCSDS areas such as MOIMS and SOIS. The SIS services provide hardware-independent mechanisms for identifying end systems and provide communications services that allow users to disregard whether the communication is over a single data link layer or over multiple hops. The suite of capabilities developed by the SIS area accommodates all ranges of delay, interactivity, and directionality, although not all protocols are appropriate for all environments.

The services provided by SIS protocols free applications from having to have intimate knowledge of the underlying communications protocols and mechanisms, and from having to know the physical location(s) of the entities with which they are communicating. This enables applications to focus on the application-specific protocols and interactions necessary to achieve their goals.

SIS GOAL 1
Promote the use of Internet standards for data transport, routing, and auxiliary functions in environments where end-to-end paths exist and are relatively stable. This includes the use of Transmission Control Protocol (TCP) (including options defined by CCSDS and/or the Internet Engineering Task Force [IETF]) when round trip times are low (~<2s), and possible use of User Datagram Protocol (UDP) for unidirectional paths and/or high delay paths.​

SIS GOAL 2
Develop a Solar System Internet (SSI) suite of protocols and procedures to enable, under policy control of the asset (e.g., spacecraft) managers, cross-supported internetworked data communications.​

SIS GOAL 3
Develop Application-Layer protocols targeted at internetworked operation that are also capable of running over single-hop mechanisms such as the Encapsulation Service and the Licklider Transmission Service.​

—keith

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