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Chapter One
Introduction and Background
Thomas Sälzer and Matthew Baker
1.1 The Context for the Long Term Evolution of UMTS
1.1.1 Historical Context
The Long Term Evolution of UMTS is just one of the latest steps in an advancing series of
mobile telecommunications systems.
Arguably, at least for land-based systems, the series began in 1947 with the development
of the concept of cells by the famous Bell Labs of the USA. The use of cells enabled the
capacity of a mobile communications network to be increased substantially, by dividing the
coverage area up into small cells each with its own base station operating on a different
frequency.
The early systems were confined within national boundaries. They attracted only a small
number of users, as the equipment on which they relied was expensive, cumbersome and
power-hungry, and therefore was only really practical in a car.
The first mobile communication systems to see large-scale commercial growth arrived
in the 1980s and became known as the `First Generation' systems. The Fi ... read full excerpt from LTE, The UMTS Long Term Evolution: From Theory to Practice ebook