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Clustered Content Replication for Hierarchical Content Delivery Networks
KTH, School of Electrical Engineering (EES), Automatic Control.
KTH, School of Electrical Engineering (EES), Automatic Control.ORCID iD: 0000-0001-9810-3478
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2015 (English)In: 2015 IEEE International Conference On Communications (ICC), 2015, Vol. 2015, 5872-5877 p.Conference paper (Refereed)
Abstract [en]

Caching at the network edge is considered a promising solution for addressing the ever-increasing traffic demand of mobile devices. The problem of proactive content replication in hierarchical cache networks, which consist of both network edge and core network caches, is considered in this paper. This problem arises because network service providers wish to efficiently distribute content so that user-perceived performance is maximized. Nevertheless, current high-complexity replication algorithms are impractical due to the vast number of involved content items. Clustering algorithms inspired from machine learning can be leveraged to simplify content replication and reduce its complexity. Specifically, similar items could be clustered together, e.g., according to their popularity in space and time. Replication on a cluster-level is a problem of substantially smaller dimensionality, but it may result in suboptimal decisions compared to item-level replication. The factors that cause performance loss are identified and a clustering scheme that addresses the specific challenges of content replication is devised. Extensive numerical evaluations, based on realistic traffic data, demonstrate that for reasonable cluster sizes the impact on actual performance is negligible.


Place, publisher, year, edition, pages
2015. Vol. 2015, 5872-5877 p.
, IEEE International Conference on Communications, ISSN 1550-3607
Keyword [en]
cache, clustering, content replication, Radio Access Network
National Category
Communication Systems
URN: urn:nbn:se:kth:diva-179045DOI: 10.1109/ICC.2015.7249258ISI: 000371708106016ScopusID: 2-s2.0-84953791921ISBN: 978-1-4673-6432-4OAI: diva2:880473
IEEE International Conference on Communications, ICC 2015; London; United Kingdom; 8 June 2015 through 12 June 2015

QC 20160114, QC 20160421

Available from: 2015-12-09 Created: 2015-12-09 Last updated: 2016-04-21Bibliographically approved

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