Mobile Device-to-Device (D2D) Content Delivery Networking: A Design and Optimization Framework
Mobile Device-to-Device (D2D) Content Delivery Networking: A Design and Optimization Framework
- 주제(키워드) Caching probability , caching server device , device-todevice (D2D) communication , mobile contents distributed network (mCDN) , Poisson point process (PPP).
- 발행기관 한국통신학회
- 발행년도 2014
- 총서유형 Journal
- UCI G704-000784.2014.16.5.004
- KCI ID ART001923146
- 본문언어 영어
초록/요약
We consider a mobile content delivery network (mCDN)in which special mobile devices designated as caching servers(caching-server device: CSD) can providemobile stations with popularcontents on demand via device-to-device (D2D) communicationlinks. On the assumption that mobile CSD’s are randomly distributedby a Poisson point process (PPP), an optimization problemis formulated to determine the probability of storing the individualcontent in each server in a manner that minimizes the averagecaching failure rate. Further, we present a low-complexity searchalgorithm, optimum dual-solution searching algorithm (ODSA),for solving this optimization problem. We demonstrate that theproposed ODSA takes fewer iterations, on the order of O(logN)searches, for caching N contents in the system to find the optimalsolution, as compared to the number of iterations in the conventionalsubgradient method, with an acceptable accuracy in practice. Furthermore, we identify the important characteristics of theoptimal caching policies in the mobile environment that wouldserve as a useful aid in designing the mCDN.
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