Age-of-Information (AoI)

Age-of-information (AoI) is a metric used to assess the freshness of data by measuring latency from receivers’ perspectives. It is simply defined as the time elapsed since the latest useful piece of information that reached its intended destination has been generated at its source.

AoI is very relevant in applications in which information is time-varying, such as in vehicular monitoring systems, industrial sensor networks and surveillance videos, among others.

Techniques used to optimize other latency metrics, such as rate (throughput) and transmission delay, are often not optimal in AoI-centric frameworks. It is therefore necessary to develop new methodologies to optimize and analyze systems that use AoI, or more generally any functional of AoI, as their performance metric.

One main research goal of our group is to study the fundamental nature of AoI, and how useful it can be in communications, networks and control applications.

Below are some examples of the landscape that we cover in this regard (sorted by topic name alphabetically).

Channel Coding

Cloud Computing

Economics and Data Markets

Energy Harvesting Communications

Large-Scale Networking

Machine Learning

  • Towards Understanding Federated Learning over Unreliable Networks
    C. Feng, A. Arafa, Z. Chen, M. Zhao, T. Q. S. Quek, and H. H. Yang

  • Age-Based Scheduling Policy for Federated Learning in Mobile Edge Networks
    H. H. Yang, A. Arafa, T. Q. S. Quek, and H. V. Poor
    IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP), Barcelona, Spain, May 2020.

Privacy-Preserving Systems

  • Private Status Updating with Erasures: A Case for Retransmission Without Resampling
    A. Arafa and K. Banawan
    IEEE International Conference on Communications (ICC), Rome, Italy, May 2023

  • Timely Private Information Retrieval
    K. Banawan, A. Arafa, and S. Ulukus
    IEEE International Symposium on Information Theory (ISIT), Melbourne, Australia, July 2021.

Remote Estimation and Tracking