Probabilistic Caching for Small-Cell Networks with Terrestrial and Aerial Users

Fei Song, Jun Li, Ming Ding, Long Shi, Feng Shu, Meixia Tao, Wen Chen, H. Vincent Poor

Research output: Contribution to journalArticlepeer-review

22 Scopus citations


The support for aerial users has become the focus of recent Third-Generation Partnership Project standardizations of 5G, due to their high maneuverability and flexibility for on-demand deployment. In this paper, probabilistic caching is studied for ultra-dense small-cell networks with terrestrial and aerial users, where a dynamic on-off architecture is adopted under a sophisticated path loss model incorporating both line-of-sight and non-line-of-sight transmissions. Generally, this paper focuses on the successful download probability (SDP) of user equipments (UEs) from small-cell base stations (SBSs) that cache the requested files under various caching strategies. To be more specific, the SDP is first analyzed using stochastic geometry theory, by considering the distribution of such two-tier UEs and SBSs as homogeneous poisson point processes. Second, an optimized caching strategy (OCS) is proposed to maximize the average SDP. Third, the performance limits of the average SDP are developed for the popular caching strategy (PCS) and the uniform caching strategy (UCS). Finally, the impacts of the key parameters, such as the SBS density, the cache size, the exponent of Zipf distribution, and the height of aerial user, are investigated on the average SDP. The analytical results indicate that the UCS outperforms the PCS if the SBSs are sufficiently dense, while the PCS is better than the UCS if the exponent of Zipf distribution is large enough. Furthermore, the proposed OCS is superior to both the UCS and PCS.

Original languageEnglish (US)
Article number8766883
Pages (from-to)9162-9177
Number of pages16
JournalIEEE Transactions on Vehicular Technology
Issue number9
StatePublished - Sep 2019
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Aerospace Engineering
  • Electrical and Electronic Engineering
  • Computer Networks and Communications
  • Automotive Engineering


  • Small-cell caching
  • UAV
  • optimization
  • stochastic geometry
  • successful download probability


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