17 papers
Minimizing Age of Incorrect Information in Pull-Based Remote Estimation of a Markov Source
Ismail Cosandal, Sennur Ulukus, Nail Akar
In this paper, we consider a discrete-time pull-based remote estimation system involving an information source and a remote monitor where the information source is a finite-state i…
Dynamic Attack Surfaces: A Queue of Branching Processes
Ismail Cosandal, Abdullah Y. Etcibasi, C. Emre Koksal +1
Modern attack surfaces are inherently dynamic. Vulnerabilities emerge over time and they remain exposed to exploit until defenders discover and patch them. Artificial intelligence…
Dual-Regime Absorbing Markov Chain Theory in Remote Estimation: Age-Minimizing Push Policies
Ismail Cosandal, Sennur Ulukus, Nail Akar
For a remote estimation system, we study the optimization of age of incorrect information (AoII), which is a recently proposed semantic-aware information freshness metric. In parti…
When and Which Sensor to Observe? Timely Tracking of a Joint Markov Source
Ismail Cosandal, Sennur Ulukus, Nail Akar
We investigate the problem of remote estimation (at a monitor) of a discrete-time joint Markov process with individual components which can be observed with dedicated sensors. At a…
How Far Back in Time a Digital Twin Reflects the State of the Physical Object: Age of Staleness
Ismail Cosandal, Sennur Ulukus
The groundbreaking metric age of information (AoI) has been introduced to measure information freshness in communication networks. As transformational as it is, AoI metric falls sh…
Age of Information with Age-Dependent Server Selection
Nail Akar, Ismail Cosandal, Sennur Ulukus
In this paper, we consider a single-source multi-server generate-at-will discrete-time non-preemptive status update system where update packets are transmitted using {\em only one}…
Semi-Markov Decision Process Framework for Age of Incorrect Information Minimization
Ismail Cosandal, Sennur Ulukus, Nail Akar
For a remote estimation system, we study age of incorrect information (AoII), which is a recently proposed semantic-aware freshness metric. In particular, we assume an information…
Optimal Source Coding of Markov Chains for Real-Time Remote Estimation
Ismail Cosandal, Sennur Ulukus
We revisit the source coding problem for a Markov chain under the assumption that the transmission times and how fast the Markov chain transitions its state happen at the same time…
Timely Tracking of a Wiener Process With Single Bit Quantization
Ismail Cosandal, Sahan Liyanaarachchi, Sennur Ulukus
We consider the problem of timely tracking of a Wiener process via an energy-conserving sensor by utilizing a single bit quantization strategy under periodic sampling. Contrary to…
Minimizing Functions of Age of Incorrect Information for Remote Estimation
Ismail Cosandal, Sennur Ulukus, Nail Akar
The age of incorrect information (AoII) process which keeps track of the time since the source and monitor processes are in sync, has been extensively used in remote estimation pro…
Source Coding for a Wiener Process
Sahan Liyanaarachchi, Ismail Cosandal, Sennur Ulukus
We develop a novel source coding strategy for sampling and monitoring of a Wiener process. For the encoding process, we employ a four level ``quantization'' scheme, which employs m…
Which Sensor to Observe? Timely Tracking of a Joint Markov Source with Model Predictive Control
Ismail Cosandal, Sennur Ulukus, Nail Akar
In this paper, we investigate the problem of remote estimation of a discrete-time joint Markov process using multiple sensors. Each sensor observes a different component of the joi…
Joint Age-State Belief is All You Need: Minimizing AoII via Pull-Based Remote Estimation
Ismail Cosandal, Sennur Ulukus, Nail Akar
Age of incorrect information (AoII) is a recently proposed freshness and mismatch metric that penalizes an incorrect estimation along with its duration. Therefore, keeping track of…
Multi-Threshold AoII-Optimum Sampling Policies for CTMC Information Sources
Ismail Cosandal, Nail Akar, Sennur Ulukus
We study push-based sampling and transmission policies for a status update system consisting of a general finite-state continuous-time Markov chain (CTMC) information source with k…
AoII-Optimum Sampling of CTMC Information Sources Under Sampling Rate Constraints
Ismail Cosandal, Nail Akar, Sennur Ulukus
We consider a sensor that samples an -state continuous-time Markov chain (CTMC)-based information source process, and transmits the observed state of the source, to a remote mon…
Modeling AoII in Push- and Pull-Based Sampling of Continuous Time Markov Chains
Ismail Cosandal, Nail Akar, Sennur Ulukus
Age of incorrect information (AoII) has recently been proposed as an alternative to existing information freshness metrics for real-time sampling and estimation problems involving…
Timely Multi-Goal Transmissions With an Intermittently Failing Sensor
Ismail Cosandal, Sennur Ulukus
A sensor observes a random phenomenon and transmits updates about the observed phenomenon to a remote monitor. The sensor may experience intermittent failures in which case the mon…