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 …

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 …

A source node updates its status as a point process and also forwards its updates to a
network of observer nodes. Within the network of observers, these updates are forwarded as …

In this paper, we investigate the age minimization problem for a two-hop relay system, under
a resource constraint on the average number of forwarding operations at the relay. We first …

Sensor sources submit updates to a monitor through an unslotted, uncoordinated, unreliable
multiple access collision channel. The channel is unreliable; a collision-free transmission is …

A source node forwards fresh status updates as a point process to a network of observer
nodes. Within the network of observers, these updates are forwarded as point processes …

Age-of-information (AoI) is a metric quantifying information freshness at the receiver. It
captures the delay together with packet loss and packet generation rate. However, the …

This letter studies the “age of information”(AoI) in a multi-source status update system where
N active sources each send updates of their time-varying process to a monitor through a …

This article considers a cooperative Internet-of-Things (IoT) system with a source aiming to
transmit randomly generated status updates to a designated destination as timely as …

We consider a single-unicast networking scenario where a sender periodically sends a
batch of data to a receiver over a multi-hop network, possibly using multiple paths. We study …