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ATM망 적용을 위한 비디오 데이터의 지연 · 지터 분석
경문현,서덕영 한국방송공학회 1996 한국방송공학회 학술대회 Vol.1 No.1
Delay and fitter are critical factors in the real-time video services over ATM network. Mostly, delay and fitter problem are generated in input buffer when video data are multiplexed. In this paper, we analyze delay and fitter of input buffer, and consider efficient control and flexible bandwidth allocation of video traffic. Also, we analyze decision of buffer size related maximum allowable delay.
가변비트율 MPEG-2 비트열의 합성과 QoS를 고려한 다중화 이득에 관한 연구
장승기,서덕영,경문현,박섭형,정재일 한국통신학회 1996 韓國通信學會論文誌 Vol.21 No.11
Over ATM network, variable bit rate(or VBR) traffic is allowed. Control of VBR traffic is allowed. Control of VBR traffic becomes difficult if it is bursty. VBR video traffic becomes so much bursty during intra frame period that much cell loss would occur when satistical multiplexed in ATM swich. To aviod cellloss, extra communication resources should be allocated, which reduces the capability of an ATM channel. In this paper, we propose two methods which enable a channel limited in resources to serve more VBR MPEG video bit streams. Firstly, we could redue the bitrate fluction of a statiscally multiplexed bundle of VBR video bit streams by reducing the number of intra frames overlapped at the same frame period. This method can be used in ATM switch which controls multiple video sources. Secondary, in two layer enoding, statistical multiplexing gains can be icreased by letting peak bit rate durations of both layers not be overlapped. This results in more smooth traffic. The performance of proposed methods are demonstrated by a proposed calculation method of statistical multiplexing gains(or SMGs.) The proposed SMG is based on both delay and cell loss QoS requirements at the same time.
서덕영,장승기,경문현,박섭형 경희대학교 산학협력기술연구원 1996 산학협력기술연구논문집 Vol.2 No.-
This paper describes two traffic shaping methods for VBR(variable bit rate) video bit streams encoded in the MPEG-2 syntax. Difficulties in control of VBR video traffic are lessened by traffic shaping. Burstness of single layer MPEG-2 can be reduced by performing intra-refresh in more than one consecutive frames. In two layer encoding of spatial scalability, burstness can be reduced by setting the temporal locations of GOP starting frame of a layVBR 트래픽을 허용한다는 것이다. 모든 AAL er, differently from the other. Queueing analysis shows that these two methods outperform conventional encoding schemes in terms of temporal and semantic QoS requirements.