12 research outputs found
Age of Information in Multicast Networks with Multiple Update Streams
We consider the age of information in a multicast network where there is a
single source node that sends time-sensitive updates to receiver nodes.
Each status update is one of two kinds: type I or type II. To study the age of
information experienced by the receiver nodes for both types of updates, we
consider two cases: update streams are generated by the source node at-will and
update streams arrive exogenously to the source node. We show that using an
earliest and transmission scheme for type I and type II updates,
respectively, the age of information of both update streams at the receiver
nodes can be made a constant independent of . In particular, the source node
transmits each type I update packet to the earliest and each type II
update packet to the earliest of receiver nodes. We determine the
optimum and stopping thresholds for arbitrary shifted exponential
link delays to individually and jointly minimize the average age of both update
streams and characterize the pareto optimal curve for the two ages