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We consider a wireless communication network with an adaptive scheme toselect the number of packets to be admitted and encoded for each transmission,and characterize the information timeliness. For a network of erasure channelsand discrete time, we provide closed form expressions for the Average and PeakAge of Information (AoI) as functions of admission control and adaptive codingparameters, the feedback delay, and the maximum feasible end-to-end rate thatdepends on channel conditions and network topology. These new results guide thesystem design for robust improvements of the AoI when transmitting timesensitive information in the presence of topology and channel changes. Weillustrate the benefits of using adaptive packet coding to improve informationtimeliness by characterizing the network performance with respect to the AoIalong with its relationship to throughput (rate of successfully decoded packetsat the destination) and per-packet delay. We show that significant AoIperformance gains can be obtained in comparison to the uncoded case, and thatthese gains are robust to network variations as channel conditions and networktopology change.

Robust Improvement of the Age of Information by Adaptive Packet Coding