System Architecture

The system architecture that will comprise a CDMA2000 network is a logical
extension of an existing CDMAone network with the fundamental difference
being the introduction of packet data services. The implementation
of a CDMA2000 system is meant to involve upgrades to the BTS and BSC
for the purpose of handling the packet data services. Additionally, the use of
packet data services also necessitates the introduction of a packet server
complex that may exist already to support services like CDPD.
However, it is recommended that the existing packet data network that
exists should not by default be considered for inclusion into the
CDMA2000 network architecture. The system architecture for a
CDMA2000 network, due to packet data services, can be either centralized
or distributed. The decision as to whether the system utilizes a distributed
or centralized system is dependant upon the design requirements
as well as operational issues. Figure 4-8 is an example of a standalone
CDMA2000 system that has the inclusion of a PDSN for handling packet
data services.