The Journal of the Institute of Internet, Broadcasting and Communication (한국인터넷방송통신학회논문지)

The Institute of Internet, Broadcasting and Communication (한국인터넷방송통신학회)
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Weight-based Congestion Control Algorithms for H.264/SVC Streaming

H.264/SVC 스트리밍을 위한 가중치 기반 혼잡 제어 알고리즘

  • Kim, Nam-Yun (Dept. of Information System Engineering, Hansung University)
  • 김남윤 (한성대학교 정보시스템공학과)
  • Received : 2012.03.04
  • Accepted : 2012.04.13
  • Published : 2012.04.30
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Abstract

Because best-effort Internet provides no guarantees on packet delay and loss, transient network congestion may cause negative effects on H.264/SVC streaming. Thus, the congestion control is required to adjust bit rate by dropping enhancement layers of H.264/SVC streams. This paper differentiates the video streams according to different levels of importance and proposes weighted-based congestion control algorithms to use the rate-distortion characteristics of streams. To maximize the weighted sum of PSNR values of all streams on a bandwidth-constrained node, this paper proposes WNS(Weighted Near-Sighted) and WFS(Weighted Far-Sighted) algorithms to control the number of enhancement layers of streams. Through simulation, this paper shows that weighted-based congestion control algorithm can efficiently adapt streams to network conditions and analyzes the characteristics of congestion control algorithms.

인터넷은 패킷의 지연시간과 손실에 대한 보장을 제공하지 않기 때문에 일시적인 네트워크 혼잡은 H.264/SVC 스트리밍에 부정적인 영향을 줄 수 있다. 따라서 H.264/SVC 향상 계층을 제거하여 전송율을 제어함으로써 혼잡을 회피하는 기법이 필요하다. 본 논문에서는 비디오의 중요도에 따라 스트림을 분류한 후, 스트림의 비트율-왜곡 특성을 이용한 가중치 기반 혼잡 제어 알고리즘을 제안한다. 즉, 제한된 대역폭을 가진 네트워드 노드에서 가중치를 고려한 PSNR의 합을 최대화하기 위해, H.264/SVC 향상 계층의 수를 제어하는 WNS(Weighted Near-Sighted), WFS(Weighted Far-Sighted) 알고리즘을 제안한다. 그리고 시뮬레이션을 통해 가중치 기반 알고리즘의 효용성을 보이고 알고리즘의 특성을 분석한다.

Keywords

References

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