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This paper proposes a novel concept of using the sharable bandwidth of public-shared network, like FON network, to construct a scalable, robust, and high availability video streaming delivering system. By the proposed "Bandwidth Expansion" concept and approach, the video streaming source spends only a small amount of bandwidth to deliver the video streaming, but the system is capable to serve a large number of clients to receive the video streaming simultaneously. Two optimal algorithms are proposed to arrange the public-shared bandwidth so that all clients are served and the used resources are minimized. A workable prototype of the proposed PSnet system is also implemented to illustrate the feasibility of the whole concept.