Probabilistic Caching Strategy in Collaborative Small Cell Networks

International audienceThis paper will discuss the distributed caching strategies inclustered heterogeneous cellular networks. Basically, thereare two obstacles to accomplish the caching policy in thewireless access networks, i.e., the limited storage capaci-ty of small cells and the too small coverage area of eachbase station to imply content aggregation effect. Tradition-ally, the existing caching strategies only concern the localrequests within one base station coverage, which neglectsthe clustered characteristics of network infrastructure anduser traffic demand. In this paper, we consider a two-tierclustered cellular networks, within which small cells canexchange content to fulfill each user request. Intuitively,this cooperation between base stations increases the servicecapacity of clustered cellular networks as testified in ournumerical simulation