The KIPS Transactions:PartA (정보처리학회논문지A)

Korea Information Processing Society (한국정보처리학회)
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Prefetching Based Adaptive Media Playout for Seamless Media Streaming

끊김없는 미디어 스트리밍을 위한 프리페칭 기반 적응적 미디어 재생 기법

  • 이좌형 (강원대학교 컴퓨터정보통신공학과) ;
  • 정인범 (강원대학교 컴퓨터정보통신공학)
  • Published : 2009.10.31
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Abstract

Recently, with the advance of computing and networking technique, the high speed internet becomes widespread, however, it is still hard job to do streaming the media which requires high network bandwidth over the internet. Previous researches for streaming over the internet mainly proposed techniques that controls the QoS(Quality of Service) of the media in proportion to the network status. Though, this could be the solution for the service provider while the service user who wants constant QoS may not satisfy with variable QoS. In the paper, we propose a network adaptive prefetching technique, PAP, for guarantee of constant QoS. The PAP prefetches frames by increasing the frame transmission rate while the available network bandwidth is high. The PAP uses the prefetched frames to guarantee the QoS while the available network bandwidth is low and increases the playout interval to prevent buffer underflow. The experiment result shows that the proposed PAP could guarantee the constant QoS by prefetching the frames adaptively to the network bandwidth with the characteristic of video stream.

기존의 인터넷 기반 스트리밍에 관한 연구들에서는 네트워크의 변화에 따라 적응적으로 QoS(Quality of Service)를 조절하는 기법들을 제시하여 왔다. 하지만 이는 서비스 제공자 입장에서의 문제 해결이며 네트워크 상태에 상관없이 일정한 QoS를 원하는 사용자에게는 적합하지 않다. 본 논문에서는 네트워크 상태가 변하더라도 끊김없는 미디어 스트리밍을 보장하는 프리페칭 기반 적응적 미디어 재생 기법인 PAP을 제안한다. 제안하는 PAP기법에서는 서버 측에서 네트워크 장애에 대비하여 미디어 데이터를 미리 전송하는 프리페칭 기법을 사용하며 클라이언트에서는 장애발생시 프리페칭된 미디어 데이터의 재생간격을 적응적으로 조절하여 재생하도록 한다. 클라이언트에서는 네트워크에 장애 발생여부에 따라 프레임의 재생간격을 늘리거나 줄여 버퍼 언더플로우가 발생할 확률을 줄인다. 프리페칭과 적응적 미디어 재생 기법을 함께 사용함으로써 미디어의 화질 열화와 재생 지연을 최소화시킬 수 있다. 실험을 통하여 비디오 스트림의 특성을 분석하였으며 이를 바탕으로 네트워크 상태에 따라 적응적으로 프리페칭을 함으로써 기존 방식에 비해 QoS를 일정하게 유지할 수 있음을 보였다.

Keywords

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