Age-Optimal Power Control for Status Update Systems with Packet-Based Transmissions

Deli Qiao, M. Cenk Gursoy

Research output: Contribution to journalArticle

Abstract

This letter investigates the average age of information (AoI) minimization in status update systems in which the update packets are transmitted with fixed rate. It is assumed that the source avoids queue-induced delay by generating and sending a new status update packet in each time slot. Assuming that the transmit power can be adapted based on the number of successive negative acknowledgments (NACKs) received, a closed-form expression for the average AoI is derived considering transmissions over block fading channel models. An optimization problem for minimizing the average AoI under average power constraints is formulated and a stochastic optimization algorithm for obtaining a feasible solution is proposed. Numerical results on the proposed power control policy show that more power is preferred to be allocated to packets after a certain number of failure packets in the low-power regime and the proposed power control reduces the average AoI compared to the constant power policy. An alternative on-off power control policy is also proposed and shown to achieve satisfactory performance.

Original languageEnglish (US)
Article number8772205
Pages (from-to)1604-1607
Number of pages4
JournalIEEE Wireless Communications Letters
Volume8
Issue number6
DOIs
StatePublished - Dec 2019

Keywords

  • Age of information (AoI)
  • Markov chain
  • simulated annealing
  • stochastic optimization

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Electrical and Electronic Engineering

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