在點對點(Peer-to-Peer)影音串流服務中，如何找尋合適的串流提供者是一個重要的研究議題。OBN [4]是一個專為隨選視訊之特性設計的點對點串流系統。在隨選視訊的影音環境中，OBN利用streaming chaining [6]的概念，將網路中所有的使用者連結成一個特別的點對點架構，並提供一個能有效搜尋串流提供者的演算方法。依據模擬器實驗結果，在隨選視訊的環境下，在OBN內可有效搜尋串流提供者。為了驗證OBN在實際網路環境下的可行性，本篇論文將此OBN之原始構想實作於PlanetLab[1]之上。
本篇論文的貢獻在於OBN的系統實作。不同於原始構想的模擬器實驗結果，在考量真實網路環境下所可能衍生的問題，我們做了更進一步的系統改良和設計，以及相關問題的探討。

For peer-to-peer (P2P) media streaming systems, one of the critical issues is to discover suitable supplying peers which can provide required media segments to the requesting peer. Through a simulation-based study, OBN [4] is shown to be a promising mechanism for finding streaming suppliers. OBN presents a special peering structure and corresponding routing approach for efficient supplier discovery in an on-demand P2P media streaming system. We examine the feasibility of OBN by realizing it on top of PlanetLab [1]. This thesis contributes on further OBN system design and implementation which take into account the additional requirements imposed by the real network environment.

[1]B. Chun, D. Culler, T. Roscoe, A. Bavier, L. Peterson, M. Wawrzoniak, and M. Wawrzoniak, "PlanetLab: An Overlay Testbed for Broad-Coverage Services," ACM SIGCOMM Computer Communication Review, vol. 33, no. 3, pp. 3-12, 2003.
[2]S.F. Ho, "Streaming Video Chaining on Unstructured Peer-to-Peer Networks," Master Thesis, National Tsing Hua University, Taiwan, 2003.
[3]L. Guo, S. Chen, S. Ren., X. Chen, and S. Jiang. "PROP: A Scalable and Reliable P2P Assisted Proxy Streaming System," Proc. of the 24th International Conference on Distributed Computing Systems (ICDCS'04), March 2004.
[4]C.S. Liao, W.H. Sun, C.T. King, H.C. Hsiao, "OBN: Peering for Finding Suppliers in P2P On-demand Streaming Systems, " Proc. of IEEE Int'l Conf. on Parallel and Distributed Systems (ICPADS 2006), July 2006.
[5]B. des Ligneris, "Virtualization of Linux Based Computers: The Linux-VServer Project," Proc. of the 19th International Symposium on High Performance Computing Systems and Applications (HPCS), pp. 340-346, May 2005.
[6]S. Sheu, K.A. Hua, and W. Tavanapong, "Chaining: A Generalized Batching Technique for Video-on-Demand System," Proc. of IEEE International Conference on Multimedia Computing and Systems, pp. 110-117, 1997.
[7]I. Stoica, R. Morris, D. Karger, F. Kaashoek, and H. Balakrishnan, "Chord: A Scalable Peer-To-Peer Lookup Service for Internet Applications," Proc. of ACM SIGCOMM, 2001.