P2P 스트리밍을 지원하는 PVR 시스템에서 협력버퍼링 기법
A Cooperative Buffering Scheme for PVR Systems to Support P2P Streaming
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초록
최근 네트워크와 컴퓨터 기술의 발전으로 네트워크에 연결 가능한 PVR(Personal Video Recorder)은 인터넷을통해 데이터를 전송받아서 사용자가 원하는 시간에 원하는 비디오를 시청할 수 있게 해준다. 본 논문에서는 P2P PVR 시스템에서 라이브 시점을 시청하고 있는 PVR들이 자신의 유휴 저장 공간을 활용하여 라이브 시점 이전의 재생 구간 중에서 자신에게 할당된 구간의 데이터를 협력하여 캐싱함으로써 전체 재생 구간에서의 재생 연속성을 크게증가시키는 버퍼링 기법을 제안한다. 이 기법에서는 구간별 데이터의 실제 중복 정도와 사용자들의 시청 시점 분포를 동시에 고려하여 PVR들이 협력하여 데이터를 캐싱함으로써 평균 재생 연속성을 크게 증가시킨다.
Abstract
With the advances in networking and computer technologies, networked PVRs enable users to watch the video they want when they want by receiving the data through the Internet. In this paper, we propose a buffering scheme to significantly increase the playback continuity in all the playback intervals prior to the live broadcasting time by caching the interval assigned to each PVR with its available buffer spaces. This scheme can increase the average playback continuity significantly by cooperating with other PVRs for caching the data, considering the degree of the data duplication in each playback interval and the distribution of users’ playback positions.
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