We summarize recent contributions in the broad area of age of information (AoI). In
particular, we describe the current state of the art in the design and optimization of low …

We examine multiple independent sources providing status updates to a monitor through
simple queues. We formulate an age of information (AoI) timeliness metric and derive a …

An energy-harvesting sensor node that is sending status updates to a destination is
considered. The sensor is equipped with a battery of finite size to save its incoming energy …

Freshness of status update packets is essential for enabling services where a destination
needs the most recent measurements of various sensors. In this paper, we study the …

A source provides status updates to monitors through a network with state defined by a
continuous-time finite Markov chain. An age of information (AoI) metric is used to …

We consider a system consisting of N source nodes communicating with a common receiver.
Each source node has a buffer of infinite capacity to store incoming bursty traffic in the form …

This article comprehensively surveys the area of age of information (AoI) in the wireless
networks and focuses on categorising and reviewing the current progress on AoI from an …

We consider a cache updating system with a source, a cache and a user. There are n files.
The source keeps the freshest version of the files which are updated with known rates λ i …

Internet of Things (IoT) has emerged as one of the key features of the next-generation
wireless networks, where timely delivery of status update packets is essential for many real …

Information freshness in IoT-based status update systems has recently been studied through
the Age of Information (AoI) and Peak AoI (PAoI) performance metrics. In this article, we …