Journal of the Institute of Electronics and Information Engineers (전자공학회논문지)

The Institute of Electronics and Information Engineers (대한전자공학회)
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Caching Algorithm for Core Network Offloading in Smallcell Environment

소형셀 환경에서 코어망 오프로딩을 위한 캐시 알고리즘

  • Jung, So-Yi (Department of Electrical and Computer Engineering, Ajou University) ;
  • Kim, Jae-Hyun (Department of Electrical and Computer Engineering, Ajou University)
  • Received : 2014.12.12
  • Accepted : 2015.03.04
  • Published : 2015.03.25
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Abstract

In this paper, we propose a smallcell local caching algorithm under user's context in smallcell environment. The proposed system reduces traffic to core network and the network cost, but increases it's performance. The proposed algorithm precache suitable files using smallcell's regional characteristics and target's personality. It can adjusts a storage allocation to make effective usage of our limited cache storage capacity. In order to evaluate the performance of the proposed cache algorithm, we define the cache efficiency, the decrement of core network traffic. The simulation results show that the proposed algorithm can improve performance by about 200% compared to existing web cache scheme.

본 논문에서는 소형셀 환경에서 사용자의 context를 반영한 local caching 알고리즘을 제안한다. 소형셀 내부에 캐시를 이용하면 코어망으로 전달되는 트래픽을 감소시킬 뿐만 아니라 네트워크 비용을 절감시키고 통신의 성능을 증가시킬 수 있다. 제안하는 알고리즘은 소형셀 특성을 활용해 각 소형셀 사용자에 맞는 적절한 데이터를 캐시에 저장한다. 이를 통해 제한된 캐시저장 공간을 효율적으로 사용하고 고전적인 웹 캐시 방식에 비해 캐시 적중률을 높였다. 성능분석을 위해 코어망 트래픽 감소량을 나타내는 cache efficiency를 정의하고 제안한 알고리즘의 성능을 검증한 결과 기존 웹 캐시 방식에 비해 200%의 성능향상이 있었다.

Keywords

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