Transcript coordination.ppt

Coordination of Safety-Critical Mobile
Real-Time Embedded Systems
Aline Senart, Mélanie Bouroche, Barbara Hughes
and Vinny Cahill
Distributed Systems Group
Trinity College Dublin
Ireland
CRTES, April 4th, 2006
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Motivations
Mobile
devices
+
=>
wireless
capabilities
Mobile safety-critical
applications
Key requirement: Real-time coordination
2/5
Impediments 1/2
• Timely communication is hard to provide
Event producer
Interested consumer
P
Other nodes
X
Adequate real-time (ad hoc)
wireless communication models
– Proactive routing useful? Partition anticipation? Mobility
prediction? How to limit excessive resource reservation?
– Can we provide temporal guarantees by imposing some
constraints? Is it possible to inform the application about a
decrease of latency or a network partition? How can we provide
such a feedback in real-time?
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Impediments 2/2
• Application-wide safety constraints are difficult to
guarantee for interacting embedded systems
Appropriate real-time
coordination models
– Is it possible to automate the translation of application-specific
constraints into constraints on individual embedded systems?
– How to keep distributed views and actions timely and
consistent?
– How to resynchronise outdated views in a bounded interval of
time?
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Conclusion
• Need for real-time coordination of safety-critical mobile
embedded systems
– Adequate real-time wireless communication and appropriate
coordination models required
• Our current research
– Designing and implementing the Space-Elastic Model that
returns to application a varying geographical area in which realtime communication is guaranteed
– Currently investigating a coordination model able to ensure
system-wide safety constraints
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