To Transmit Now or Not to Transmit Now

Dzung, Dacfey; Guerraoui, Rachid; Kozhaya, David; Pignolet, Yvonne-Anne

doi:10.1109/srds.2015.26

Cited by 11 publications

(4 citation statements)

References 44 publications

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“…In the studies mentioned above, only stationary error probabilities are considered. Moreover, Dzung et al (2015) provided a thorough investigation of switching off a singular interface that has an unreliable channel, based on channel feedback. The goal of the authors is thus aligned with ours since they aim for an energy-efficient transmission policy given bursty channels, for reliable connectivity of synchronous services.…”

Section: Literature Reviewmentioning

confidence: 99%

Performance Trade-Offs in Cyber–Physical Control Applications With Multi-Connectivity

et al. 2021

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Modern communication devices are often equipped with multiple wireless communication interfaces with diverse characteristics. This enables exploiting a form of multi-connectivity known as interface diversity to provide path diversity with multiple communication interfaces. Interface diversity helps to combat the problems suffered by single-interface systems due to error bursts in the link, which are a consequence of temporal correlation in the wireless channel. The length of an error burst is an essential performance indicator for cyber–physical control applications with periodic traffic, as this defines the period in which the control link is unavailable. However, the available interfaces must be correctly orchestrated to achieve an adequate trade-off between latency, reliability, and energy consumption. This work investigates how the packet error statistics from different interfaces impact the overall latency–reliability characteristics and explores mechanisms to derive adequate interface diversity policies. For this, we model the optimization problem as a partially observable Markov decision process (POMDP), where the state of each interface is determined by a Gilbert–Elliott model whose parameters are estimated based on experimental measurement traces from LTE and Wi-Fi. Our results show that the POMDP approach provides an all-round adaptable solution, whose performance is only 0.1% below the absolute upper bound, dictated by the optimal policy under the impractical assumption of full observability.

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Section: Literature Reviewmentioning

confidence: 99%

Performance Trade-Offs in Cyber–Physical Control Applications With Multi-Connectivity

et al. 2021

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“…In the studies mentioned above, only stationary error probabilities are considered. Moreover, [13] provided a thorough investigation of switching off a singular interface that has an unreliable channel, based on channel feedback. The goal of the authors is thus aligned with ours since they aim for an energy-efficient transmission policy given bursty channels, for reliable connectivity of synchronous services.…”

Section: Literature Reviewmentioning

confidence: 99%

Performance trade-offs in cyber-physical control applications with multi-connectivity

Donevski¹,

Leyva-Mayorga²,

Nielsen³

et al. 2021

Preprint

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Modern communication devices are often equipped with multiple wireless communication interfaces with diverse characteristics. This enables exploiting a form of multiconnectivity known as interface diversity to provide path diversity with multiple communication interfaces. Interface diversity helps to combat the problems suffered by single-interface systems due to error bursts in the link, which are a consequence of temporal correlation in the wireless channel. The length of an error burst is an essential performance indicator for cyber-physical control applications with periodic traffic, as these define the period in which the control link is unavailable. However, the available interfaces must be correctly orchestrated to achieve an adequate trade-off between latency, reliability, and energy consumption. This work investigates how the packet error statistics from different interfaces impacts the overall latency-reliability characteristics and explores mechanisms to derive adequate interface diversity policies. For this, we model the optimization problem as a partially observable Markov Decision Process (POMDP), where the state of each interface is determined by a Gilbert-Elliott model whose parameters are estimated based on experimental measurement traces from LTE and Wi-Fi. Our results show that the POMDP approach provides an all-round adaptable solution, whose performance is only 0.1% below the absolute upper bound, dictated by the optimal policy under the impractical assumption of full observability.

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“…However, there is a small probability that reliability and timeliness are violated. Such violations exist in networks, as arguably all communication is prone to random disturbances, e.g., bad channel quality, interference, collisions, and buffer overflows [4].…”

Section: System and Threat Modelmentioning

confidence: 99%

<italic>RT-ByzCast</italic>: Byzantine-Resilient Real-Time Reliable Broadcast

Kozhaya

Decouchant

Esteves-Veríssimo

2019

IEEE Trans. Comput.

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Today's cyber-physical systems face various impediments to achieving their intended goals, namely, communication uncertainties and faults, relative to the increased integration of networked and wireless devices, hinder the synchronism needed to meet real-time deadlines. Moreover, being critical, these systems are also exposed to significant security threats. This threat combination increases the risk of physical damage. This paper addresses these problems by studying how to build the first real-time Byzantine reliable broadcast protocol (RTBRB) tolerating network uncertainties, faults, and attacks. Previous literature describes either real-time reliable broadcast protocols, or asynchronous (non real-time) Byzantine ones.We first prove that it is impossible to implement RTBRB using traditional distributed computing paradigms, e.g., where the error/failure detection mechanisms of processes are decoupled from the broadcast algorithm itself, even with the help of the most powerful failure detectors. We circumvent this impossibility by proposing RT-ByzCast, an algorithm based on aggregating digital signatures in a sliding time-window and on empowering processes with self-crashing capabilities to mask and bound losses. We show that RT-ByzCast (i) operates in real-time by proving that messages broadcast by correct processes are delivered within a known bounded delay, and (ii) is reliable by demonstrating that correct processes using our algorithm crash themselves with a negligible probability, even with message loss rates as high as 60%.

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To Transmit Now or Not to Transmit Now

Cited by 11 publications

References 44 publications

Performance Trade-Offs in Cyber–Physical Control Applications With Multi-Connectivity

Performance Trade-Offs in Cyber–Physical Control Applications With Multi-Connectivity

Performance trade-offs in cyber-physical control applications with multi-connectivity

<italic>RT-ByzCast</italic>: Byzantine-Resilient Real-Time Reliable Broadcast

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