NDN에서 Off-Path 콘텐츠 접근기법들에 대한 성능 비교 연구
A Comparative Study on Off-Path Content Access Schemes in NDN
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초록
인터넷에서의 대용량 콘텐츠들에 대한 서비스가 일반화됨에 따라 기존 TCP/IP 프로토콜에서의 비효율적인 데이터 전송에 대한 문제점들이제기되었고, 그 결과로 정보중심네트워크 (Information-centric networking) 패러다임이 새롭게 제시되었다. 정보중심네트워크에서는 IP와 같은위치 식별자를 대신하여 콘텐츠 이름을 통해 콘텐츠 접근이 이루어지며, 네트워크 노드들 (e.g., 라우터)은 캐시를 활용하여 전송중인 콘텐츠들을저장하여 이후 발생하는 사용자 요청들에 대한 서비스를 수행할 수 있다. 사용자 요청이 멀리 위치한 콘텐츠 서버가 아닌 가까운 네트워크 캐시에서서비스될 수 있게 됨에 따라 서비스 지연 감소, 네트워크 대역폭의 효율적 사용, 서비스 확장성 확보 등의 이점이 소개되었다. 그런데 이와 같은정보중심네트워크에서의 이점들은 캐시에 저장되어 있는 콘텐츠가 얼마나 적극적으로 활용될 수 있느냐에 의해 결정될 수 있다. 본 논문에서는1) 정보중심네트워크의 대표적인 아키텍쳐 중의 하나인 Named-data Networking (NDN) 에서의 콘텐츠 접근 기법에 대해 소개하고, 2) 특별히라우팅 경로를 벗어나 캐시되어 있는 콘텐츠들을 접근할 수 있도록 하기 위해 제안된 기법들에 대한 리뷰를 진행하며, 3) ndnSIM 시뮬레이터를활용해 이들 기법들에 대한 성능 비교 평가를 진행한다.
Abstract
With popularization of services for massive content, the fundamental limitations of TCP/IP networking were discussed and a new paradigmcalled Information-centric networking (ICN) was presented. In ICN, content is addressed by the content identifier (content name) insteadof the location identifier such as IP address, and network nodes can use the cache to store content in transit to directly service subsequentuser requests. As the user request can be serviced from nearby network caches rather than from far-located content servers, advantagessuch as reduced service latency, efficient usage of network bandwidth, and service scalability have been introduced. However, theseadvantages are determined by how actively content stored in the cache can be utilized. In this paper, we 1) introduce content accessschemes in Named-data networking, one of the representative ICN architectures; 2) in particular, review the schemes that allow accessto cached content away from routing paths; 3) conduct comparative study on the performance of the schemes using the ndnSIM simulator.
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