Analysis of Networked Event-Based Control with a Shared Communication Medium: Part II – Slotted ALOHA

Blind, Rainer; Allgöwer, Frank

doi:10.3182/20110828-6-it-1002.01098

Cited by 20 publications

(22 citation statements)

References 9 publications

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“…Moreover, in every simulated NCS setting the same error thresholds λ are applied for all sub-systems. The number of micro slots is set to h = 150 and the waiting times are chosen from Poisson distributions with error-dependent mean (11). To tune the scaling factor α i k ′ , we utilize the feedback signal broadcasted from the channel, according to the following empirical law…”

Section: Numerical Resultsmentioning

confidence: 99%

“…The concavity of the local pmf s emphasizes the prioritized character of the MAC protocol as it ensures that the waiting times are more likely selected around the mean (11). Thus, the higher the local error of a sub-system is, the shorter the selected waiting time is expected to be.…”

Section: A Decentralized Mac Architecturementioning

confidence: 99%

“…Consider that both sub-systems select their waiting times ν 1 k+1 and ν 2 k+1 from identical pmf s, with the same meanᾱ ē k 2 2 , according to (11). Hence, each sub-system has 50% chance of channel access.…”

Section: Stability Analysismentioning

confidence: 99%

“…The majority of the results study event-triggered sampling for single-loop networked control systems, while multi-loop NCSs over shared communication resources have attained little attention with some exceptions in [9]- [11]. In addition, it is mainly assumed that perfect state information is available for the event-trigger.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Decentralized event-triggered medium access control for networked control systems

Mamduhi

Kneissl

Hirche

2016

2016 IEEE 55th Conference on Decision and Control (CDC)

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Abstract-In practice often multiple control applications share a communication channel, requiring a smart and scalable scheduling mechanism to coordinate the access to the capacitylimited communication medium. In this paper, we propose a decentralized event-triggered medium access control (MAC) for multiple feedback control loops which are coupled through a capacity-limited communication medium. The individual control loops are assumed to be linear time-invariant (LTI) with stochastic heterogeneous plants. Noisy state measurements from local sensors are transmitted through a shared communication medium to their respective control units. Due to capacity limitations in the shared communication channel, not all sensors are allowed to transmit simultaneously. To allocate the scarce resources, a decentralized MAC which prioritizes the channel access according to a real-time error-dependent measure, is introduced. The prioritization is orchestrated via a combined deterministic and probabilistic mechanism aiming at the efficient allocation of the limited capacity. We study stability of the described multi-loop NCS under the proposed MAC design in terms of Lyapunov stability in probability (LSP). It is demonstrated that the collision rate remains low by properly tuning the MAC parameters. Numerical results show that the proposed MAC design significantly outperforms conventional time-triggered and random access schemes, while its performance closely follows the centralized TOD approach.

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Section: Numerical Resultsmentioning

confidence: 99%

Section: A Decentralized Mac Architecturementioning

confidence: 99%

Section: Stability Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Decentralized event-triggered medium access control for networked control systems

Mamduhi

Kneissl

Hirche

2016

2016 IEEE 55th Conference on Decision and Control (CDC)

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“…Many results exist which propose improvements for the LTE RA procedure [1,12,16,17] for general class of M2M devices, however, significantly less contributions can be found in coupling the control system properties and efficient network resource allocation. In [2,3] authors compare the event-based and periodic control via single channel ALOHA for a network of homogeneous integrator sub-systems. Additionally, Cervin et.…”

Section: Introductionmentioning

confidence: 99%

Adaptive Decentralized MAC for Event-Triggered Networked Control Systems

Vilgelm

Mamduhi

Kellerer

et al. 2016

Proceedings of the 19th International Conference on Hybrid Systems: Computation and Control

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Control over shared communication networks is a key challenge in design and analysis of cyber-physical systems. The quality of control in such systems might be degraded due to the congestion while accessing the scarce communication resources. In this paper, we consider a multiple-loop networked control system (NCS), where all control loops share a communication network. Medium Access Control (MAC) is performed in contention-based fashion using a multi-channel slotted ALOHA protocol, where each control loop decides locally whether to attempt a transmission based on some error thresholds. We further introduce a local event-based resource-aware scheduling design with an adaptive choice of the error thresholds for a transmission. This leads to a hybrid channel access mechanism where the control loops are deterministically categorized into two sets of eligible and ineligible sub-systems for transmission in an event-based fashion, before a random process to select the available channels. In addition, employing the introduced policy, we show the stability of the resulting NCS in terms of Lyapunov stability in probability. We illustrate numerically the efficiency of our proposed approach in terms of reducing the average networked-induced error variance, and show the superiority of the adaptive event-based scheduler compared to the scheduling design with non-adaptive thresholds.

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On time-triggered and event-based control of integrator systems over a shared communication system

Blind

Allgöwer

2013

Math. Control Signals Syst.

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Analysis of Networked Event-Based Control with a Shared Communication Medium: Part II – Slotted ALOHA

Cited by 20 publications

References 9 publications

Decentralized event-triggered medium access control for networked control systems

Decentralized event-triggered medium access control for networked control systems

Adaptive Decentralized MAC for Event-Triggered Networked Control Systems

On time-triggered and event-based control of integrator systems over a shared communication system

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