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A framework of a content distribution service synchronized with tv broadcasting programs

We are developing a system framework for an Internet content distribution service synchronized with TV broadcasting programs. To achieve high service scalability, we propose a service system model that divides data transmissions into real-time ones and the others. Real-time control data are delivered to the clients in a push style; there are no request messages sent by the clients to the server to achieve high communication efficiency. The other data (content data) are delivered to the clients in a conventional pull style using HTTP. To avoid synchronized rushes of an enormous number of HTTP requests at the server, each client shifts the download start time of a content set randomly under a certain restriction depending on the type of the program, the estimated download time, the content display time, etc.