Transcript Study into IPS Suitability for Air-Ground ATM Communication

Study into IPS Suitability for Air-Ground
ATM Communication
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Carsten Underbjerg, Ericsson
Member of Helios Study Consortium
European
Organisation for the Safety of Air Navigation
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18th September 2006
Introduction
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The Future Communication Infrastructure (FCI) will support
both ATS and AOC data communication applications between
aircraft and ground systems for 2020+
This presentation describes a study into the use of the Internet
Protocol Suite (IPS) for future air-ground communication
supporting critical Air Traffic Services (ATS)
The study is being undertaken by a Helios led consortium of
industrial partners on behalf of Eurocontrol
Study objectives
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Assess the feasibility of using IP to support the next generation of
collaborative ATS air-ground applications
Taking advantage of COTS components, where possible
Identify a representative sample of Data Link Services that will be deployed
in the 2020+ timeframe
Derive a common set of application requirements that an IPS
implementation must satisfy if it is to be deployed
Investigate the use of the IPS over a representative sample of air-ground,
ground-ground and air-air networks
This phase of work will result in a set of “top down” application requirements,
and “bottom up” information on how the IPS is expected to be implemented
and what it can provide.
Study team
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The study team has wide experience both of the aviation and
wider industrial applications of the IPS
It will explore the potential of a future IPS system, using
lessons learnt from current ATN-based implementations.
The team is led by Helios Technology (UK), and supported by:
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Ericsson (Sweden)
Sofréavia (France)
Luftfartsverket LFV (Sweden)
Rockwell Collins (France)
DLR (Germany)
SITA (Multinational)
What is the Problem?
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ATN has already demonstrated that packet mode communications
air/ground works
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Downlinking IP packets is straightforward
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The IPS is simply the industry standard means of achieving the same thing
Aircraft may consider ground station to be a “default router”
Properly addressed IP packets can be forwarded from Ground Station into the
ground Internet for delivery
However, Uplink is a problem
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IP Addresses are Network Relative
An Aircraft will have a different IP Address on each air/ground network it is
attached to
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Assigned statically or dynamically
How can seamless uplink communications be achieved if the air/ground
network changes in flight?
Options Available
Network Assigned IP Address
Remains Constant
In Flight
May change
In Flight
Application
Must be
Resilient to
Change
Network Changes
In Flight
Same Network
Used throughout
Flight
Manage IP Address
Change in Internet
(macromobilty)
IP Address
Transferred
Between Networks
(micromobility)
No Problem!
Send IP Address
Advisories
To Ground Peer
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Use
Mobile IP
Use
Routing Protocols
No Problem!
Choice of Options
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Cannot assume same network always available during a Flight
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Micromobility is attractive but
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Resilience issues
Denial of Service Issues
Relies on network providers to co-ordinate
Does not permit operations where network providers do not or are
unable to co-operate
Concern over transition when need to upgrade technology
The above solutions may be used wherever possible, but
Study needs to address a full Solution
IP Study will Investigate
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The design of Applications that are tolerant to IP Address
Change
Mobile IP based solutions including NEMO
Routing Protocol based solutions
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Building on experience with existing ATN approach
A different team will look at each approach
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A competitive approach will be used to either
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Select Best Solution
Determine when a given solution is appropriate
The Study will investigate three scenarios
Scenario 1
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Mobility Management using Standard Routing Protocols
A simple translation of the current ATN specification to the IPS
Similar to the current ATN mobility support, but using the IPS
protocol BGP-4 (RFC 1771 Border Gateway Protocol) instead
of ISO standard IDRP (ISO/IEC 10747 Inter-domain Routing
Protocol)
The applications and ATN Upper Layer Communications
Service are otherwise unchanged
If this scenario is to be successful then it will be important to
demonstrate that the known problems can be solved without a
radical change of approach
Scenario 2
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Mobility Management using Mobile IP to manage mobility
An IPS ATN based on RFC specified Mobile IP
The study will investigate whether such scenarios result in a
reduced level of functionality (e.g. by not supporting more than
one mobile network simultaneously), and if so how significant
this is
There is also a concern over COTS support of Mobile IP, and
this issue will need investigation.
Is NEMO relevant?
Scenario 3
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Mobility Management using the Application Message Server
Application managed mobility
A “three layer approach”, where
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The lowest layer is standard TCP/IP with no special requirements including no
mobility support requirements
The middle layer is an ATN message server and provides a common message
exchange and mobility management. It encapsulates what is ATN specific
functionality that is common to all Data Link Services, but which is not subject to
safety requirements
The top layer is the user layer that supports the user exchange of messages
and is subject to safety requirements.
The separation of top and middle layers follows PM-CPDLC approach
The proposed Message Server is resilent to IP Address change but can be
used with other Mobility Solutions
Work breakdown structure
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WP1: Application requirement analysis
WP2: IPS Analysis
WP3: Assessment of Candidate Future Comm Infrastructures
WP4: Security Threat and Vulnerability Analysis
WP5: Review and Recommendation of the Candidate IPS
Architecture
WP6: Use Cases
WP7: Trials and Simulations
Study Deliverables
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Application Requirements Report – 2020+ Timeframe
IPS Analysis – a survey of the IPS today and how it is
implemented over many different networks
Analysis of Mobility Options
Security Threat and Vulnerability Analysis
Recommended Future Comm Architecture
“Use Cases”
Proposals for Trials and Prototypes
Consultation – Forthcoming Workshop
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To obtain a wide involvement from stakeholders when
assessing the candidate scenarios, the assessment will include
a workshop on 8th November 2006 at Eurocontrol HQ
The workshop will present:
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the Data Link Service requirements, the IPS implementation options,
and the three candidate scenarios
the assessment criteria and the security report
Recommendations on the Future Comm Architecture
Consensus will be sought as to which is the preferred scenario
Questions
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For further information concerning the study, please contact:
Danny Van Roosbroek
EATM – DAS/CSM
Eurocontrol HQ
[email protected]
Tel: +32-2-729 3471
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