Mobile Communication History and CDMA Standard

The history of mobile communication can be traced back to the early 20th century, but its fast growth did not come until recent 20 years. The development of mobile communications technologies is basically focused on opening new frequency ranges for mobile communications, effective frequency utilization, and mobile station miniaturization and portability. Here, the technology for effective frequency utilization is the core of mobile communications.

The first mobile telephone system was commissioned in the United States in 1940’s. Bell Labs in the United States introduced the concepts and theory of cellular systems in the early 1970’s. The evolution of cellular mobile communication systems is shown in TABLE 1.

AMPS： Advanced Mobile Phone System
TACS： Total Access Communication System
GPRS： General Packet Radio Services

Position of iBSC in Network

When TC is internal, the position of ZXG10 iBSC (V6.20) in the

network is shown in Figure 1.

When TC is external, the position of iBSC in the network is shown in Figure 2.

 ZXG10 iBSC (V6.20) is a part of GERAN (the GSM/EDGE Radio Access Network). GERAN includes one or multiple BSSs, and one BSS consists of one BSC and one or multiple BTSs. BSC is connected with BTS via Abis interface, and BSC-BSC, BSC-RNC are connected with each other via Iur-g interface. If TC is internal, GERAN is connected with GSM/UMTS Core Network via A/Gb/Iu interface. GERAN has two working modes: A/Gb mode and Iu mode and can work in these two modes at the same time. In this case, the 2G MS uses A/Gb working mode, the working mode used by the MS supporting Iu mode depends on GERAN and MS together.