Spectrum-aware energy efficiency analysis in K-tier 5G hetnets

Fereidoun H. Panahi, Farzad H. Panahi, Tomoaki Ohtsuki

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


In future multi-tier cellular networks, cognitive radio (CR) compatible with device-to-de-vice (D2D) communication can be an aid to enhance system spectral efficiency (SE) and energy efficiency (EE). Users in proximity can establish a direct connection with D2D communication and by-pass the base stations (BSs), thereby offloading the network infrastructure and providing EE im-provement. We use stochastic geometry to model and analyze cognitive D2D communication underlying a multi-tier/multi-channel cellular network where the D2D transmitters are capable of harvesting RF energy from ambient interference resulting from simultaneous cellular downlink trans-missions. For further improvement in EE, small cells (SCs) can be put into a power-saving mode by specifying a load-dependent transmission power coefficient (TPC) for SC BSs. In addition, to con-sider practical D2D communication scenarios, we propose a wireless video sharing framework where cache-enabled users can store and exchange popular video files through D2D communica-tion. We investigate the potential effects of the TPC and the introduced D2D layer on the network EE and SE. We will also observe that the energy-harvesting CR-based D2D communication network design will not only ease the spectrum shortage problem but will also result in a greener network thanks to its reliance on ambient energies.

Original languageEnglish
Article number839
JournalElectronics (Switzerland)
Issue number7
Publication statusPublished - 2021 Apr 1


  • Cache-enabled multi-tier cellular network
  • Detection and false alarm proba-bility
  • Energy efficiency
  • Energy harvesting
  • Overlay and underlay in-band D2D
  • Spectrum sensing

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Signal Processing
  • Hardware and Architecture
  • Computer Networks and Communications
  • Electrical and Electronic Engineering


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