Online transmission policy in wireless powered networks with urgency-aware age of information

Yang Lu, Ke Xiong, Pingyi Fan, Zhangdui Zhong, Khaled Ben Letaief

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

This paper investigates the age of information (AoI) for a radio frequency (RF) energy harvesting (EH) enabled network, where a sensor first scavenges energy from a wireless power station and then transmits the collected status update to a sink node. To capture the thirst for the fresh update becoming more and more urgent as time elapsing, urgency-aware AoI (U-AoI) is defined, which increases exponentially with the increment of time between two received updates. Due to EH, a waiting time is required at the sensor before transmitting the status update. An optimization problem is formulated to minimize the long-term average U-AoI under constraint of energy causality. A two-layer algorithm is presented to solve it, where the outer loop is designed based on Dinklebach's method, and the inner loop presents a semi-closed-form expression of the optimal waiting time policy based on Karush-Kuhn-Tucker (KKT) optimality conditions. Numerical results show that our proposed optimal transmission policy outperforms the zero time waiting policy and equal time waiting policy in terms of long-term average U-AoI, especially when the networks are in slight load. It also shows that the system U-AoI first decreases and then keeps unchanged with the increments of EH circuit's saturation level.

Original languageEnglish
Title of host publication2019 15th International Wireless Communications and Mobile Computing Conference, IWCMC 2019
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages1096-1101
Number of pages6
ISBN (Electronic)9781538677476
DOIs
Publication statusPublished - Jun 2019
Event15th IEEE International Wireless Communications and Mobile Computing Conference, IWCMC 2019 - Tangier, Morocco
Duration: 24 Jun 201928 Jun 2019

Publication series

Name2019 15th International Wireless Communications and Mobile Computing Conference, IWCMC 2019

Conference

Conference15th IEEE International Wireless Communications and Mobile Computing Conference, IWCMC 2019
CountryMorocco
CityTangier
Period24/6/1928/6/19

    Fingerprint

Keywords

  • Non-linear energy harvesting model
  • Urgency-aware age of information
  • Wireless power transfer

ASJC Scopus subject areas

  • Hardware and Architecture
  • Computer Networks and Communications
  • Safety, Risk, Reliability and Quality

Cite this

Lu, Y., Xiong, K., Fan, P., Zhong, Z., & Letaief, K. B. (2019). Online transmission policy in wireless powered networks with urgency-aware age of information. In 2019 15th International Wireless Communications and Mobile Computing Conference, IWCMC 2019 (pp. 1096-1101). [8766741] (2019 15th International Wireless Communications and Mobile Computing Conference, IWCMC 2019). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/IWCMC.2019.8766741