Coordination of SafetyCritical Mobile RealTime Embedded Systems

1
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
gt
Mobile safety-critical applications
Key requirement Real-time coordination
3
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?

4
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• How to resynchronise outdated views in a bounded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?

5
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 real-time
  communication is guaranteed
• Currently investigating a coordination model able
  to ensure system-wide safety constraints