INTRODUCTION AND CHALLENGES
Mobile communication systems have evolved from supporting analog voice only to powerful systems providing hundreds of thousands of different applications to billions of users. We are just at the beginning of a transition into a fully connected Networked Society that will provide access to information
and sharing of data anywhere and anytime for anyone and anything. Thus, in the future wireless access will not only be about connectivity for people but for anything that benefits from being connected.This includes such diverse things as household appliances, traffic control and safety functions, infrastructure monitoringsystems, medical equipment, and much more.As a consequence, compared to the wireless networks of today, next-generation wireless access will support a much wider range of use case characteristics and corresponding access requirements.