• Title/Summary/Keyword: Hybrid Video-on-demand

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Hybrid Multicast/Broadcast Algorithm for Highly-Demanded Video Services with Low Complexity (Highly-Demanded 비디오 서비스를 위한 낮은 복잡도의 혼합 멀티캐스트/브로드캐스트 알고리즘)

  • Li, Can;Bahk, Sae-Woong
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.36 no.1B
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    • pp.101-110
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    • 2011
  • With the deployment of broadband networking technology, many clients are enabled to receive various Video on Demand (VoD) services. To support many clients, the network should be designed by considering the following factors: viewer's waiting time, buffer requirement at each client, number of channel required for video delivery, and video segmentation complexity. Among the currently available VoD service approaches, the Polyharmonic and Staircase broadcasting approaches show best performance with respect to each viewer's waiting time and buffer requirement, respectively. However, these approaches have the problem of dividing a video into too many segments, which causes very many channels to be managed and used at a time. To overcome this problem, we propose Polyharmonic-Staircase-Staggered (PSS) broadcasting approach that uses the Polyharmonic and Staircase approaches for the head part transmission and the Staggered approach for the tail part transmission. It is simple and bandwidth efficient. The numerical results demonstrate that our approach shows viewer's waiting time is comparable to that in the Harmonic approach with a slight increase in the bandwidth requirement, and saves the buffer requirement by about 60\% compared to the Harmonic broadcasting approach by simply adjusting the video partitioning coefficient factor. More importantly, our approach shows the best performance in terms of the number of segments and the number of channels managed and used simultaneously, which is a critical factor in real operation of VoD services. Lastly, we present how to configure the system adaptively according to the video partitioning coefficient.

Problem over Upstream Channel in the TCP Connections of HFC/ATM Networks

  • Park, Sang-Jun;Park, Woo-Choo;Rhee, Byung-Ho
    • Proceedings of the IEEK Conference
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    • 2000.07a
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    • pp.505-508
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    • 2000
  • We discuss simulation results concerning the performance of the TCP protocol when running over high-speed HFC networks. Hybrid Fiber Coaxial are likely to provide fast and cost effective sup-port to a variety of applications including Video on demand, interactive computer games, and internet-type applications such as Webbrowsing, ftp, and telephony. Since most of these applications, use TCP as the transport later protocol, the key to their success largely depends on the effectiveness of the TCP protocol. In all simulation scenarios the TCP traffic is maxed with some background traffic whose level is taken as a variable parameter. Both the background traffic and TCP traffic are either unshaped, or shaped according to the GCRA algorithm. The effect of the background traffic on the TCP protocol performance is discussed varying the buffering capacity with nodes as well as the peak bit rate that each TCP connection is allowed to use.

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Method of Synchronization for Multi-view sequences over Hybrid delivery environment (하이브리드 전송 환경하의 다시점 미디어 서비스 동기화 방안)

  • Park, JungWook;Kim, Byungchul;Kim, Kyuheon
    • Proceedings of the Korean Society of Broadcast Engineers Conference
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    • 2011.11a
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    • pp.356-359
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    • 2011
  • 최근 방송 시스템의 디지털화, 통신기술과 가전제품의 발전으로 스마트 TV 시대가 열리게 되었다. 이제 시청자들은 스마트 TV를 통해 기존의 디지털 방송과 IP(Internet Protocol) 통신이 융합한 하이브리드 방송 서비스가 가능해지면서 기존 방송망을 통한 실시간 콘텐츠 서비스와 더불어 IP망을 통한 VOD(Video on Demand) 서비스, 멀티뷰(Multi-view) 서비스의 이용이 가능하게 되었다. 그 중 멀티뷰 서비스는 시청자가 동일한 시간의 영상을 다양한 시점에서 동시에 볼 수 있는 서비스로서, 하이브리드 방송 환경 하에서 현 방송 규격인 MPEG-2 TS(Transport Stream) 콘텐츠와 IP망을 통해 전달되는 실시간/비실시간 콘텐츠가 멀티뷰 서비스가 이루어질 때 콘텐츠 간의 시간정보 규격이 서로 상이하여 동기화에 어려움이 있다. 따라서 본 논문에서 이종망을 기반으로 한 하이브리드 방송 환경내의 다시점 콘텐츠의 동기화 방안을 제안하고자 한다.

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The Dynamic Group Authentication for P2P based Mobile Commerce (P2P 기반의 모바일 상거래를 위한 동적 그룹 인증)

  • Yun, Sunghyun
    • Journal of Digital Convergence
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    • v.12 no.2
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    • pp.335-341
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    • 2014
  • To play the networked video contents in a client's mobile device in real time, the contents should be delivered to it by the contents server with streaming technology. Generally, in a server-client based commerce model, the server is in charge of both the authentication of the paid customer and distribution of the contents. The drawback of it is that if the customers' requests go on growing rapidly, the service quality would be degraded results from the problems of overloaded server or restricted network bandwidth. On the contrary, in P2P based networks, more and more the demand for service increasing, the service quality is upgraded since a customer can act as a server. But, in the P2P based network, there are too many servers to manage, it's possible to distribute illegal contents because the P2P protocol cannot control distributed servers. Thus, it's not suitable for commercial purposes. In this paper, the dymanic group authentication scheme is proposed which is suited to P2P based applications. The proposed scheme consists of group based key generation, key update, signature generation and verification protocols. It can control the seeder's state whether the seeder is joining or leaving the network, and it can be applied to hybrid P2P based commerce model where sales transactions are covered by the index server and the contents are distributed by the P2P protocol.

A Multicast Delivery Technique for VCR-like Interactions in Collaborative P2P Environment (협력 P2P 환경에서 VCR 기능을 위한 멀티캐스트 전송 기법)

  • Kim Jong-Gyung;Kim Jin-Hyuk;Park Seung-Kyu
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.31 no.7B
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    • pp.679-689
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    • 2006
  • Delivering multicast stream is one of the cost-saving approach in the large scale VOD environment. Because implementing VCR-like interactions for user's convenience in the multicast streaming system involves complex problems, we need the proper solutions for them. In this paper, we propose a hybrid scheme which uses the general P2P and the patching scheme with the Collaborative Interaction Streaming Scheme(CISS). CISS provides jumping functionability to the appropriate multicast session after VCR-like interaction in the environment in which multiple peers transmit VCR-like interaction streams to the VCR-like functionability request node to reduce the loads generated by frequent join or departure of peers at the multicast tree during providing VCR-like functionability. Therefore, with the proposed scheme we can distribute network traffic and reduce control overhead and latency. And to evaluate the performance of proposed scheme we compare it in the aspect of the performance of streaming delivery topology, control overhead and streaming quality with P2Cast[10] and DSL[11]. The simulation result shows that proposed P2Patching reduces about 30% of process overhead and enhances about $25{\sim}30%$ of streaming quality compared with DSL.