Introduction to Optimisation of the UMTS Radio Network

What does it mean to optimise a UMTS network? Going through the books which have the word 'optimisation' in the title, the reader can feel a bit lost since this term is usually not defined. Often the word 'optimisation' is used for network planning activities and even more often authors imply 'manual' optimisation. What is, therefore, the right approach? Optimisation theory is devoted to searching the coordinates of the highest (maximum) or the lowest value (minimum) of a function. This process can be very simple and conducted in analytical form when e.g. the function derivatives can be computed in the entire domain. It can also turn out to be really complicated, usually when the function is described as a “black box”; in this case, many iterations need to be performed to estimate the optimum. Therefore, optimisation theory as a whole additionally concentrates on methods which are able to find the optimum and do this as quickly as possible. Unfortunately, the majority of real life optimisation problems, including UMTS radio network optimisation, cannot be treated in a direct and simple way by means of analytical optimisation, since the mathematical model of the network is far too complicated (if possible to create at all). In this chapter we hence aim to introduce some notions related to UMTS radio network optimisation and intend to answer some of above questions.

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