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The AirTight Protocol for Mixed Criticality Wireless CPS

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Publication details

JournalACM Transactions on Cyber Physical Systems
DateAccepted/In press - 15 Sep 2019
Original languageEnglish


This paper describes the motivation, design, analysis and
configuration of the criticality-aware multi-hop wireless
communication protocol AirTight. Wireless communication has become a
crucial part of the infrastructure of many cyber-physical
applications. Many of these applications are real-time and also
mixed-criticality, in that they have components/subsystems with
different consequences of failure. Wireless communication is
inevitably subject to levels of external interference. In this paper
we represent this interference using a criticality-aware fault
model; for each level of temporal interference in the fault model we
guarantee the timing behaviour of the protocol (i.e.~we guarantee
that packet deadlines are satisfied for certain levels of
criticality). Although a new protocol, AirTight is built upon
existing standards such as IEEE 802.15.4. A prototype
implementation and protocol-accurate simulator have been produced.
This paper develops a series of schedulability analysis techniques
for single-channel and multichannel wireless Cyber-Physical Systems (CPS).
Heuristics are specified and evaluated as the starting
point of design space exploration. Genetic algorithms are then
defined and evaluated to assess their performance in developing
schedule tables incorporating multichannel allocations in these

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