Evolving perspectives of 4th generation mobile communication systems

The last decade of the 20^th century has been witness to remarkable technological developments in the area of wireless communication technologies. Following the commercial deployment-and subsequent worldwide success-of 2^nd generation mobile telecommunication systems, such as GSM, standardization bodies, industry partners and regulatory fora from around the globe joined forces in producing the standards for 3^rd generation mobile telecommunication systems. In parallel, the academic research community has been gradually shifting its focus in defining the scope of 4^th generation systems. The present paper highlights fundamental concepts and presents key market developments in 4^th generation mobile communication environments. It outlines their major high level requirements and identifies the fundamental building blocks of 4^th generation system architectures in terms of technological solution sets. Finally, it proposes a set of priorities for the 4^th generation research agenda.