Written by: Andreas Witzel

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The horizontally layered architecture introduced by Ericsson is playing a key role in the migration from earlier architectures into third-generation multiservice networks. A central element in the horizontally layered architecture is the network control layer. Here, control servers perform call and session control. In this article, which describes Ericsson’s move away from the traditional, vertically integrated networks, the author gives a broad overview of the new architecture supplied by third-generation networks. He also emphasizes the central network control layer and the control server related to it, by giving detailed examples of typical traffic cases for the different domains in the network control layer.

[First published in Ericsson Review no. 04, 2000]