DEVELOPMENT OF THE BASE STATION CONTROLLER AND MANAGER IN THE CDMA-MOBILE-SYSTEM

The base station (BS) in the CDMA Mobile System (CMS) connects calls t hrough the radio interface and is designed to provide mobile subscribe rs with high quality service in spite of mobile subscribers' motions. The BS consists of multiple base station transceiver subsystems (BTSs) , a base station controller (BSC) and a base station manager (BSM). Th is paper is concerned with the BSC and the BSM. The BSC is located bet ween the BTSs and the mobile switching center (MSG) connected with the public network, and is responsible for controlling mobile calls from and to mobile subscribers via the BTSs. The BSM provides operator-inte rfaces per the BS and takes responsibility of operation and maintenanc e (OAM) of the BS. Design of the BSC is based on two module types: fun ctional module and unit module. The functional module is used to suppo rt new services easily and the unit module to increase the system capa city economically. Both modular types are easily achieved by inserting the corresponding modules to the system. Particularly, in order to ef ficiently support the soft handover which is one of CDMA superior adva ntages, the BSC adopts a large highspeed packet switch connecting up t o 512 BTSs, and thus mobile subscribers can be provided with soft hand over in high probability. The BSM is based on a commercial workstation to support OAM functions efficiently and guarantee high reliability o f the functions. The BSM uses graphical user interface (GUI) for effic ient OAM functions of the BS.