Intelligent-Reflecting-Surface-Empowered Wireless-Powered Caching Networks

Zheng Chu, Pei Xiao, Mohammad Shojafar, De Mi, Wanming Hao, Jia Shi, Jie Zhong

Research output: Journal PublicationArticlepeer-review

3 Citations (Scopus)


In this article, we propose an intelligent reflecting surface (IRS)-enabled wireless-powered caching system. In the proposed IRS model, a power station (PS) provides wireless energy to multiple Internet of Things (IoT) devices, delivering their information to an access point (AP) by utilizing the harvested power. The AP, equipped with a local cache, stores the IoT data to avoid waking up the IoT devices frequently. Meanwhile, we deploy the IRS involving in the wireless energy and information transfer process for performance enhancements. In this practical system, the PS and AP could belong to different service providers. Also, the AP requires to incentivize the PS to offer a provisional energy service. We model the interaction between the PS and AP as a Stackelberg game that jointly optimizes the transmit power of the PS, the energy price, the phase shifts of the wireless energy transfer (WET) and wireless information transfer (WIT) phases, as well as wireless caching strategies of the AP. In this way, we first derive the optimal solutions of the phase shifts and the transmit power of the PS in a closed form. We propose an alternating optimization (AO) algorithm to optimize the wireless caching strategies and the energy price iteratively. Finally, we present various numerical evaluations to validate the beneficial role of the IRS and the wireless caching strategies and the performance of the proposed scheme compared with the existing benchmark schemes.

Original languageEnglish
Pages (from-to)13153-13167
Number of pages15
JournalIEEE Internet of Things Journal
Issue number15
Publication statusPublished - 1 Aug 2022
Externally publishedYes


  • Intelligent reflecting surface (IRS)
  • Internet of Things (IoT)
  • phase shifts
  • Stackelberg game
  • wireless caching
  • wireless-powered communication networks (WPCNs)

ASJC Scopus subject areas

  • Signal Processing
  • Information Systems
  • Hardware and Architecture
  • Computer Science Applications
  • Computer Networks and Communications


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