English title

This paper presents the structural design for huge systems using Divide & Conquer (D&C) method as a scientific method for optimum designing of complex systems. This method divides the main system into several simple subsystems. Submitted equations in three different cases prove that the optimum response (number of subsystems for minimum system complexity) is independent of main system complexity function. As a case study, this method is used to design Mobile Switching Centre (MSC) with minimum complexity. Then it is explained that how embedding a high speed Local Area Network (LAN) in MSC structure to connect its internal subsystems can improve interoperability of them. It can be an important advantage in compare of Siemens and Nokia companies switch designs which extremely have been installed in Iran.