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SISG

IOAG Space Internetworking

Strategy Group

CNES DLR ESA JAXA NASA

Summary of Solar System Internet (SSI)
Operations Concept

CCSDS DTN Working Group

May 5, 2010

1

SISG

The Case for a Solar System Internet (SSI)


Future space missions will include features that cannot
be accommodated by today’s link layer based
communications


Multiple spacecraft


Intermittent connectivity and long light
-
time delays


Data flow across multiple hops and potential paths


Spacecraft that need to communicate without Earth in
the loop (e.g., a
lander

and orbiter)



This complex topology will require a network layer in
the space communications protocol stack to provide
reliable routing and forwarding of data

2

SISG

IOAG Mandate to SISG


The IOAG’s Space Internetworking Strategy Group (SISG) should
formalize a draft Solar System Internetwork (SSI) Operations Concept
and candidate architectural definition in time for IOAG
-
13 and should
prepare a mature architectural proposal for review and endorsement at
the third Inter
-
Operability Plenary meeting (IOP
-
3). At that time, the
IOAG is requested to present an enhanced service catalog for
endorsement. The IOP Agencies should ensure representation from
their programs and projects to work with SISG to identify potential
missions which may benefit from adoption of the SSI
-
related
standards, leading to a gradual build up of in
-
space and ground
-
based
space internetworking


3

To respond to this action, the SISG has developed
an SSI Operations Concept document

SISG

SSI Purpose and Scope


The SSI will


Provide internetworked data communications services
across the Solar System to support space mission
users


Employ a confederated and interoperable
infrastructure of nodes owned and operated by
multiple space agencies


SSI participants will expose standard and agreed
cross support services at the network layer of the
ISO/OSI Reference Model


There will be no central management/ownership of the
SSI; participating agencies will follow established,
documented, interagency agreements for configuring
cross support.



4

SISG

SSI Architecture

5

Terrestrial

WAN

Earth

Station

Planetary

WAN

Earth

Planet

SSI Node w/ forwarding capability

(“Service Provider” or “Service User”)

Relay

Satellite

Landed

Spacecraft

Spacecraft

MOCs

SSI Node w/out forwarding capability

(“Service User” only)

Planetary

Station

Spacecraft

Spacecraft

Earth Station

Control
Center

Planetary Station

Control
Center

Science Ops

Center

SISG

SSI Routing and Protocol


SSI provider nodes will offer a native network layer routing service
based on:


the Internet protocol of the IP suite (
low
-
delay and well connected
environments
), and/or


the Bundle Protocol (BP) of the DTN suite

(
delayed or disconnected
environments)


Provider nodes will route data in the form of IP
datagrams

and/or
BP bundles.


User applications will be exposed only at the SSI end nodes

6

SISG

SSI Coordination


Each agency will act as an SSI
Service Provider for its user
nodes, offering SSI services
based on the capabilities of its
provider nodes


Agencies participating as SSI
providers will provide access to
each other’s nodes via peering
agreements


Long
-
term coordination: service
agreements and scheduling
rules


Short
-
term coordination: contact
plan generation (may require
iteration among User MOCs,
provider nodes, and SSI
Service Providers to
accommodate time/event
-
specific requirements)



7

May 5, 2010

SISG

DTN Demonstrations


NASA’s DINET
-
3 (Deep Impact Network Experiment)


Deep Impact spacecraft using DTN to communicate in
an operational environment


ESA’s METERON (Multipurpose End
-
To
-
End Robotic
Operations Network)


Will use ISS to prototype potential Lunar and Mars
communications scenarios


NASA planning to load and operate the DTN software
suite on EO
-
1 spacecraft to demo the applicability of
DTN to Earth science


NASA/U of CO’s Commercial Generic
Bioprocessing

Apparatus (CGBA) onboard ISS


In service 24x7, returning data via the Bundle Protocol
(ION)


8

May 5, 2010