1st International Conference on 5G for Ubiquitous Connectivity

Research Article

In-Network Caching and Content Placement in Cooperative Small Cell Networks

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  • @INPROCEEDINGS{10.4108/icst.5gu.2014.258230,
        author={Francesco Pantisano and Mehdi Bennis and Walid Saad and Merouane Debbah},
        title={In-Network Caching and Content Placement in Cooperative Small Cell Networks},
        proceedings={1st International Conference on 5G for Ubiquitous Connectivity},
        keywords={caching in-network operations cooperative networks content placement},
  • Francesco Pantisano
    Mehdi Bennis
    Walid Saad
    Merouane Debbah
    Year: 2014
    In-Network Caching and Content Placement in Cooperative Small Cell Networks
    DOI: 10.4108/icst.5gu.2014.258230
Francesco Pantisano1,*, Mehdi Bennis2, Walid Saad3, Merouane Debbah4
  • 1: Joint Research Centre - European Commission
  • 2: CWC - Centre for Wireless Communications, Oulu
  • 3: Wireless@VT, Bradley Department of Electrical and Computer Engineering, Blacksburg, VA, USA
  • 4: Mathematical and Algorithmic Sciences Lab, Huawei France R&D, Paris, France
*Contact email: francesco.pantisano@jrc.ec.europa.eu


Anticipating multimedia file requests via caching at the small cell base stations (SBSs) has emerged as a promising technique for enhancing the quality-of-service (QoS) of cellular user equipments (UEs). Nevertheless, in traditional caching approaches, files are retrieved from evolved packet core (EPC) of the network, and without coordination among SBSs, which introduces new challenges of content duplication and unbalanced traffic load on the backhaul. In this paper, we propose a collaborative framework in which the SBSs can access files from the caches of other SBSs within the same network domain (i.e., connected to the same service gateway). We design a cost model for the content retrieval of contents across SBSs and from the EPC, and we propose a costaware decentralized algorithm, based on which the SBSs devise individual caching strategies (i.e., which files to cache, and from where). Simulation results show that the proposed cooperative caching scheme yields significant gains in terms of in-network content availability, reaching up to 21% improvement compared to a traditional approaches based on geographical distribution of the UEs.