Transcript SISG-IOP2-Presentation-v1.0 - The CCSDS Collaborative Work

SISG
IOAG Space Internetworking
Strategy Group
CNES
DLR
ESA
JAXA
NASA
Report to the second Inter-Operability Plenary (IOP-2)
Space Internetworking:
a recommended strategy for
future international interoperability
IOP-2 @ Geneva
09 December 2008
The Evolution of International Cross Support
IOP-1 (June 1999)
International commitment to point-to-point cross support
Mission
recovery
Ad-hoc
Mars cross
support
Significant
International partnering
IOP-2 (December 2008)
Proposed: international commitment to end-to-end, networked cross support
the
“Solar System
Internetwork”
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Interoperability and Cross Support
A
B
INTEROPERABILITY: the technical capability of two or more systems or
components to exchange information and to use the information that has been
exchanged
Spacecraft
A
Ground
Station
B
Control
Center
A
Cross Support
Partner
CROSS SUPPORT: an agreement between two or more organizations to exploit
the technical capability of interoperability for mutual advantage, such as one
organization offering support services to another in order to enhance or enable
some aspect of a space mission
3
Resolution from IOAG-11
June 2007
The IOAG resolves to form a Space Internetworking
Strategy Group to reach international consensus on a
recommended approach for transitioning the
participating agencies towards a future “network
centric” era of space mission operations.
The group will focus on the extension of
internetworked services across the Solar System,
including multi-hop data transfer to and from remote
space locations and local networked data
interchange within and among the space end
systems.
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Space Internetworking Strategy Group (SISG):
Process

The SISG was staffed by
technical experts appointed
by the IOAG agencies







CNES
DLR
ESA
JAXA
NASA
The group met four times in
plenary session (October
2007, March 2008, May 2008,
September 2008) and during
the final phase held biweekly videoconferences
The group’s consensus
recommendations were
reported to IOAG-12,
September 2008
Characterization
of interoperability
today
Near Earth
Earth
Projection
of interoperability
2015-2030
Moon
Mission
Scenarios
Mars
Identification of
need for
Internetworking
Definition of an
Internetworking
architectural concept
Deep Space
Analysis of candidate
technologies
Recommendation:
change goals
and roadmap
5
Characterization of International Cross Support
~2008
Current international crosssupport is primarily:
CCSDS-SLE
forward &
return frame
relaying
• Bilateral
•
•
•
•
Ground-based (CCSDS ‘SLE’)
Point-to-point (based on CCSDS frames)
Relatively simple and static
Manually configured
CCSDS
long-haul
protocols
A
B
Capable
ground-based
cross support
A
B
A
A
Missionspecific
relaying
CCSDS-SLE
forward &
return frame
relaying
A
There is no international
agreement or common
framework for in-space
cross support or end-toend data exchange
Missionspecific
relaying
CCSDS
long-haul
protocols
CCSDS
proximity
protocol
A
B
B
B
Rudimentary data relay
capability at Mars
A
B
B
B
A
6
Scenario for International Cross Support
~ 2015 - 2020
Next step in cross support:
• Existing point-to-point SLE cross
support maintained and generalized
into Cross Support Transfer Services
(CSTS) and Cross Support Service
Management (CSSM)
• Basic CSTS/CSSM services deployed
and partial automation in place:
• CFDP for file transfer
• Packet-based relaying
• Encapsulation for IP and DTN
• Related Navigation, Timing, EDL
CCSDS
EDL
CCSDS
CSTS-based
end-end
data transfer
and timing
CCSDS
CSTS-based
ground relaying
and tracking
A
B
A
Standard
CCSDS
in-space
relaying
B
B
B
A
A
Upgraded
in-space
cross support
via data relays
A
• In-space cross support formalized,
CCSDS
CSTS-based
end-end
data transfer
and timing
e.g., on data relays
Extend international
cross support
agreements into space
and develop new end-toend data exchange
services
B
B
B
A
A
A
B
A
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Scenario for International Cross Support
~ 2025+
Future scenarios (e.g.,
ILN, ISECG) indicate
that international crosssupport will grow to
become:
CCSDS
end-end
space
networking
C
B
A
A
C
C
• Multilateral
• Both space and ground-based
• A mix of point-to-point and
multipoint-to-multipoint
• More complex and dynamic
• More highly automated
B
B
B \\\
C
CCSDS
end-end
space
networking
A
A
A
C
CCSDS
surface
networks
C
C
Emphasis on fullystandardized end-to-end
networked data transfer
CCSDS
crosslinks
Extensive in-space cross
support via data relays
and planetary surface
communications
B
B
A
B
C
A
B
A
A
C
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Networked Communications
SCHEDULED
Currently, end-to-end
connectivity is configured
manually by scheduling
contacts. Humans predefine static routes and
manually manage the
end-to-end data flow
Actual
C
C
B
B
A
B
C
A
B
A
A
C
manual route
reconfiguration
With a networked
approach, the networking
protocol automatically
makes the best routing
decision - selecting the
appropriate connections
based on schedule
information
C
C
B
B
A
B
C
A
B
A
operator resources
are focused on
mission results, not on
data management
A
C
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Evolution of Terrestrial Networking
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Networking
The Terrestrial Internet
1969
1971
•
•
•
•
•
Global “network of networks” (millions).
Based on IP "packet switching“ technology
Commercial, cheap, well-tested
Automated routing – low ops cost, resilient
Internet packets are routed from network to
network and delivered to the destination in real
time.
• If a route cannot be found, these packets are
discarded.
• Assumes continuous connectivity, low latency
19602000
2000
2008
1982
The Space Internet
1987
Today
• Uses commercial technology where possible
• IP can be used only if there is a continuous, low
latency end-to-end data connection; otherwise,
the emerging Disruption Tolerant Networking
(DTN) technology must be employed
• DTN doesn’t depend on continuous connection:
instead, each network node keeps “custody” of
the data as needed until it can be transferred.
• DTN uses a “store-and-forward” technique –
information does not get lost when there is no
immediate path to the destination.
• Automated routing reduces manual setup of data
paths, speeds failure recovery (by rerouting)
2015
2025
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Notional Roadmap: Solar System Internet
Infusion into international cooperative missions
Phased mission support infrastructure upgrades
SSI capability development
2008
2009
2010
2011
2012
~2013
~2015
~2025
SISG
SSI Strategy
SIAG
SSI Architecture
CCSDS
End to End and In-Space services
CFDP
Space Packet Relay
Encapsulation
DTN and IP suites
Related Navigation, Timing, EDL protocols
Initial
IP + DTN
operational
demonstrations
on ISS
Early Lunar
Network (ILN)
+
Upgraded
Mars Network
Mature Lunar
Network
+
Initial
Mars Network
(Mars Sample Return)
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Recommendations of the Strategy Group
1.
IOP-2 agencies should endorse the IOAG’s plans to embark on a significant
new international initiative to establish the vision and architectural framework
for a Solar System Internetwork (SSI)

2.
Space Internetworking Architecture Group (SIAG) should formalize a draft SSI
Architectural Definition by October 2009
CCSDS agencies should begin developing the necessary suite of space
internetworking standards


3.
Standard in-space and end-to-end cross support services.
Target completion date of 2012 to support early ILN
IOP-2 Agencies should nominate representatives from their programs and
projects to work with the SIAG to identify potential missions which may take
benefit from adoption of the SSI related standards, leading to a gradual build
up of SSI compatible in-space and ground-based infrastructure

4.
Earth Network, Lunar Network and Mars Network
Another IOP should be convened in <5 years to review progress
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SSI
Solar System Internetwork
IOAG Space
Internetworking
Strategy Group:
Process and
Findings
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Background: Evolution of Space Internetworking
Simple routing of Space
Packets over TM/TC
Adopted as the ISS baseline in 1989:
early networked operations
1. Packet TM/TC
2. Advanced Orbiting Systems (AOS)
Adaptation of the “TCP/IP” stack for use near-Earth
3. IP-based SCPS
Extension of TM/TC to short range orbiter-relay environments (Prox-1
protocol) and to ground network cross support (via SLE)
Automated file transfer over TM/TC/AOS/Prox-1.
5. CFDP
IP for real-time, short delay, connected environments.
DTN custodial, store and forward routing for disconnected environments
1980s
4. Proximity-1 & SLE
1990s
6. IP & DTN
2000s
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Projection of Cross Support: 2015-2030

Three sets of mission scenarios were analyzed:




Earth Orbiting missions
Moon Exploration
Mars Exploration
•
Mars is representative of other deep space missions
Four clear common trends were discerned:

Increasing reliance on international cross support -- a missionenabling capability
•
•

Increasing dependency on data relays
•
•


Founded in spectrum allocation
Shifting from spectrum non-interference to spectrum-sharing
Bent pipe below GEO, store and forward otherwise
Store and forward relays will evolve to become routing nodes on a network
Higher forward and return data rates
Shift towards networked operations
•
Mix of multiple data types, with different service properties and multiple sources
and destinations, sharing a common data communications infrastructure.
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Lunar + Mars Scenario: 2010-2030
Agency “B”
Science Orbiter
Agency “A”
Ground Site
Agency “C”
Rover
Agency “B”
Rover
Agency “A”
Science Orbiter
(Store/Forward)
Moon c. 2010
Mars c. 2020
Agency “B”
Rover
Agency “B”
Ground Site
Agency “B”
Science Orbiter
Agency “A”
Science Orbiter
Agency “C”
Rover
Moon c. 2020
Mars c. 2030
Manned
Rover
Agency “A”
Rover
Agency “A”
Ground Site
DTE/DFE
Proximity
Surface WLAN
“B”
Agency “A”
Comm Relay
Human
Habitat
Agency “B”
Rover
“C”
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Earth Orbiting (Robotic) Scenario: 2015-2030
Agency “B”
Science Orbiter
Agency “B”
Ground Site
Agency “C”
Ground Site
Agency “C”
Science Orbiter
Agency “A”
Science Orbiters
Agency “A”
Ground Site
Earth Science Today
Only Ground Cross-support
Earth Science 2030
The Sensor Web Era
Correlates spacecraft, surface sensors
Rapid, automated response to alerts
Enabled by automated routing across
the spacecraft RF links
Multiple Agencies
Multiple Assets
Internetworked
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The Trend Towards Internetworking: 2015-2030

The complexity of the communications topology required by future missions cannot
possibly be supported by manually- configured connectivity


International cross support requires a long-term space communications architecture that:




Drives the space community towards the need for automated routing and networking
Shifts the data communications paradigm from simple point-to-point links towards a network
of nodes provided and operated by different organizations
Is engineered to match the unique space environment (which may include frequent
disconnections, long delays, simplex links and possibly non-contemporaneous end-to-end
connectivity)
Supports a smooth evolution towards a fully internetworked configuration
The IOAG recommends that the space community should start a bold new initiative: to
establish the vision and architectural framework for a Solar System Internetwork
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Conceptual SSI Architecture
Elements:
Agencies
Rovers
Surface relays
Orbital relays
Control
Center
Control
Center
GEO / Direct
Comm Mission
LEO/MEO
Earth Orbit
Inter-Network
Lunar Orbit
And Surface
Inter-Network
Mars Orbit
And Surface
Inter-Network
Control
Center
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The Solar System Internetwork
 Provides networked data communications across the Solar System

Secure, reliable, robust, end-to-end, packet based
 A confederation of independent, cooperative infrastructure assets




Autonomously owned and operated by diverse space mission organizations
Provides common, cross-supported network services for the benefit of all participants
Terrestrial: ground stations, control facilities, ground data networks, etc.
In space: data relays, surface communications networks, collaborative space mission elements, etc.
 Bound together by:

Statements of Intent from individual organizations to contribute infrastructure capabilities in order to
support an internetworked data flow for individual missions.





Subject to bilateral or multilateral cross support agreements
Standards: An agreed set of common, extensible interoperability standards
Cross Support Services: An agreed and published catalog of commonly provided cross-support
services - in space and on Earth – that are offered by individual agencies
Management Processes: An agreed set of cross-support service management processes,
mechanisms and capabilities (in space and on Earth) that allow internetworked data flow to be invoked
and configured
Governance mechanisms to administer the necessary core internetworking management,
coordination and operations functions that enable end-to-end internetworked data communications.
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Internetworking protocols for the SSI
 Three internetworking protocols to support the SSI architecture have been
identified.

Space Packet
•

Internet Protocol (IP)
•

Continued support of conventional space missions, with fairly static connectivity
To support flexible, automated routing in short-delay space mission environments with continuous endto-end connections
Delay and Disruption Tolerant Networking (DTN)
•
To support flexible, automated routing in variable delay space mission environments with no
expectation of a continuous end-to-end data path
 CCSDS has defined a robust
Encapsulation mechanism which allows all
three of these Network layers to co-exist
and be cross-supported without perturbing
current space Link architectures and
cross-support interfaces


Fully evolutionary approach that preserves and
respects prior agency investments
Allows different protocols to be applied to different
missions to accommodate changing requirements
Space Applications (CFDP, etc.)
DTN
Space Packet
Internet Protocol
(IPv4/IPv6)
CCSDS Encapsulation
CCSDS Link – AOS, TM, TC, Prox-1
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Governance Process
 A multi-agency governance process will be needed to transition to the space
internetworking era


The internetwork contains a variety of client and service nodes owned and operated
by multiple agencies.
Governance is anticipated to be more coordination than control
 Governance examples:


Address space assignments and allocations
Mechanisms for creating service agreements and for coordinating resource
scheduling and priorities
 Governance will evolve, starting with some minimal governance during the
nascent stage and ramping up when the internetwork matures.
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Finis
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