ScholarWorks@숙명여자대학교

초록

As the use of mobile data increases, the proportion of video content is increasing steeply. In order to solve problems that arisewhen mobile users receive data from geographically remote cloud servers, methods of caching data in advance to edge serversgeographically close to the users are attracting lots of attention. In this paper, we present a caching policy that stores data on SmallCell Base Station(SBS) to effectively provide content files to mobile users by applying a delayed offloading scheme in a cellular network. The goal of the proposed policy is to minimize the size of data transmitted from Macro Base Station(MBS) because the delayed offloadingscheme requires more cost than when downloaded from MBS than from SBS. The caching policy is proposed to determine the sizeof content file and which content file to be cached to SBS using the probability of mobile users' paths and the popularity of contentfiles, and to replace content files in consideration of the overlapping coverage of SBS. In addition, through performance evaluation,it has been proven that the proposed policy reduces the size of data downloaded from MBS compared to other algorithms.

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