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<p>The digital revolution has reached broadcasting with the introduction of digital broadcasting systems like Eureka 147 DAB (Digital Audio Broadcasting). These modify traditional broadcasting by separating the actual service from the transmission system, thus enabling the distribution of any kind of digital data?audio, video, still pictures, graphics, and text?to stationary, portable, or mobile terminals. This lets service providers reach a large number of users simultaneously and independent of their location. </p> <p>Existing multimedia services are based on two-way, symmetrical, and virtually error-free communication links. However, a radio system for mobile reception can never guarantee an error-free or non-interrupted channel, and a broadcasting channel is not symmetrical. Therefore, we must develop new concepts that exploit the advantages of broadcasting and take radio channel characteristics into account. This article highlights concepts, possibilities, and difficulties of trying to realize a mobile and interactive system based on a broadcasting system. It outlines a multimedia system model and discusses its three main parts?content provider, service provider, and network provider. It also points out the importance of functions such as interactive channels, conditional access, and system management. The authors focus on DAB as an example system, but their conclusions apply to any kind of digital broadcasting system. </p>
Multimedia, mobile, broadcast, DAB, interactive

R. Rebhan, O. Franceschi, B. Wergeland, S. Olsson and P. Karlsson, "Multimedia Goes Mobile in Broadcast Networks," in IEEE MultiMedia, vol. 4, no. , pp. 14-22, 1997.
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