Predictive Caching via Learning Temporal Distribution of Content Requests

Hoon Geun Song, Seong Ho Chae, Won Yong Shin, Sang Woon Jeon

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


In this letter, dynamic content placement of a local cache server that can store a subset of content objects in its cache memory is studied. Contrary to the conventional model in which content placement is optimized based on the time-invariant popularity distribution of content objects, we consider a general time-varying popularity distribution and such a probabilistic distribution is unknown for content placement. A novel learning method for predicting the temporal distribution of future content requests is presented, which utilizes the request histories of content objects whose lifespans are expired. Then we introduce the so-called predictive caching strategy in which content placement is periodically updated based on the estimated future content requests for each update period. Numerical evaluation is performed using real-world datasets reflecting the inherent nature of temporal dynamics, demonstrating that the proposed predictive caching outperforms the conventional online caching strategies.

Original languageEnglish
Article number8836639
Pages (from-to)2335-2339
Number of pages5
JournalIEEE Communications Letters
Issue number12
Publication statusPublished - 2019 Dec

Bibliographical note

Funding Information:
Manuscript received June 12, 2019; revised August 5, 2019 and September 1, 2019; accepted September 8, 2019. Date of publication September 13, 2019; date of current version December 10, 2019. This work was supported in part by the Electronics and Telecommunications Research Institute (ETRI) grant funded by the Korean Government (18ZF1100, Wireless Transmission Technology in Multi-point to Multi-point Communications) and the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (NRF2017R1D1A1A09000835). The associate editor coordinating the review of this letter and approving it for publication was N.-S. Vo. (Corresponding author: Sang-Woon Jeon.) H.-G. Song is with the Department of Electronic, Electrical, Control and Instrumentation Engineering, Hanyang University, Ansan 15588, South Korea (e-mail:

Publisher Copyright:
© 1997-2012 IEEE.

All Science Journal Classification (ASJC) codes

  • Modelling and Simulation
  • Computer Science Applications
  • Electrical and Electronic Engineering


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