CDMA-MOBILE-SYSTEM OVERVIEW - INTRODUCTION, BACKGROUND, AND SYSTEM CONCEPTS

The CDMA Mobile System (CMS) has been developed by Electronics and Tel ecommunications Research Institute (ETRI) and field-tested for commerc ial service deployment in Korea. The project was started in 1989 and c ompleted in 1995 with the CMS commercial test. During the course of de velopment, there had been active technical cooperation with Qualcomm, Inc. and Korean manufacturers. The CMS adopted the basic CDMA concepts conforming to Korean CDMA system which was derived from IS-95. The CM S functions are allocated to subsystems by considering efficiency and expandability. The CMS consists of mobile stations and the infrastruct ure which is composed of base stations, mobile exchanges and home loca tion register/authentication center. The commercial field tests perfor med both in Taejon and Seoul have indicated that the CMS capacity is 1 0 to 15 times larger than that of AMPS. This paper overviews the devel opment history, system characteristics, architecture and test results.