System architecture for mobile communications systems beyond IMT-2000

This paper presents a system architecture for mobile communications systems beyond IMT-2000 (4G system). Considering the growth of data communications through mobile networks, the 4G system should offer higher bit rate channels and accommodate a significantly larger amount of traffic. To meet these requirements, the 4G system may use higher frequency bands. This paper first considers objectives of the 4G system and it proposes a system architecture that meets the objectives. The architecture proposed in this paper comprises core networks that will accommodate multiple types of radio access networks (RAN). The 4G RAN is constructed by distributed controlled base stations that are connected to each other by a multi-hop wireless network.