Chapter 4.2 4.2 replaced by new mobile-communication technologies. Similarly, the technical advancement in digital processors enables new and more powerful systems that not only can provide the new services, but also can provide the existing successful services better and at a lower cost The motives behind the 3G evolution Erik Dahlman, Stefan Parkvall, Johan Skold and Per Beming Before entering into a detailed discussion on technologies being used or considered for the evolution of 3G mobile communication, it is important to understand the moti- vation for this evolution: that is, understanding the underlying driving forces. This chapter will try to