hey need to be processed and carried separately. In this contribution, the control traffic from CN will address a (centralized) RAN server, whereas the user traffic is directly routed to an extended AP. This AP terminates the Iu interface for the user traffic and performs the necessary radio-specific processing. The control part of Iu is terminated in the RAN server. In order to optimize the access system and to reduce network cost, a strict separation of control and user plane is necessary. The evolved architecture should take this into account and offer the flexibility for future adaptation. The proposed generalized distributed cell architecture uses a centralized node (RAN server) only in the control plane and decentralizes the user plane handling in AP. Iu traffic should be split into a control part (Iu_c) and a user part (Iu_u). Iu_c terminates at the RAN server and Iu_u at the AP. Control information between the RAN server and AP should be transferred via the new Iu_c* (new interface to be further specified) interface. 2.2.2.1.4 Entity of Generalized Distributed RAN RAN server. Except for the user traffic handling, the RAN server behaves simi- larly to the former RNC. It manages mobility inside the RAN and the necessary Iu bearers for control and user traffic (Iu_c and Iu_u). For the control part of the Iu interface, the RAN server behaves like a regular RNC from the CN point of view. For the user part of the Iu interface, the AP acts as the former RNC. Furthermore, the RAN server manages micromobility (i.e., mobility inside RAN such as paging and AP relocation) and radio mobility (i.e., mobility between adjacent APs) via Iu_c*. AP. When antenna arrays are distributed in each cell connected to the same AP, they change to another structure called distributed MIMO (antennas 1, 2, and 3). Each AP connects several antenna elements and, by selecting some of them to serve a certain MT, constructs a generalized distributed cell. Antenna elements are responsible only for signal transmission and reception. The signa