Robustness Analysis of Networked Control Systems with Aging Status

HARQ Optimization for Real-Time Remote Estimation in Wireless Networked Control

This paper analyzes wireless network control for remote estimation of linear time-invariant dynamical systems under various Hybrid Automatic Repeat Request (HARQ) packet retransmission schemes. In conventional HARQ, packet reliability increases gradually with additional packets; however, each retransmission maximally increases the Age of Information and causes severe degradation in estimation mean squared error (MSE) performance. We optimize standard HARQ schemes by allowing partial retransmissions to increase the packet reliability gradually and limit the AoI growth. In incremental redundancy…

Revealing Much While Saying Less: Predictive Wireless for Status Update

Wireless communications for status update are becoming increasingly important, especially for machine-type control applications. Existing work has been mainly focused on Age of Information (AoI) optimizations. In this paper, a status-aware predictive wireless interface design, networking and implementation are presented which aim to minimize the status recovery error of a wireless networked system by leveraging online status model predictions. Two critical issues of predictive status update are addressed: practicality and usefulness. Link-level experiments on a Software-Defined-Radio (SDR) tes…

针对状态更新的最优拒绝服务攻击

Optimal Denial-of-Service Attacks Against Status Updating

本文针对状态更新系统的拒绝服务攻击问题，将系统建模为含不可靠信道的马尔可夫链，以两种信息年龄为指标，通过马尔可夫决策过程证明最优干扰为阈值策略，提出低复杂度求阈算法，验证错误信息年龄指标下系统抗干扰性更强。

Optimal Scheduling for Maximizing Information Freshness & System Performance in Industrial Cyber-Physical Systems

Age of Information is a newly introduced metric, getting vivid attention for measuring the freshness of information in real-time networks. This parameter has evolved to guarantee the reception of timely information from the latest status update, received by a user from any real-time application. In this paper, we study a centralized, closed-loop, networked controlled industrial wireless sensor-actuator network for cyber-physical production systems. Here, we jointly address the problem of transmission scheduling of sensor updates and the restoration of an information flow-line after any real-ti…