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). Neverthele...
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ISBN:
(纸本)9781631900556
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 cost-aware 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.
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