CDMA2000 System Design

The system design associated with code division multiple access
(CDMA2000) systems has multiple factors that are interwoven with each
other, making the design aspects a technical challenge. The CDMA2000
designer must not only account for the introduction of packet data services
into the radio and fixed network access system but also the legacy systems,
variants to 1xRTT, and eventual introduction of 3xRTT. This chapter will
attempt to quantify some of the more salient aspects with CDAM2000 system
design looking at several key scenarios that or issues that need to be
addressed when considering or expanding CDMA2000 compatible infrastructure
within a wireless system.
This chapter will cover
■ Design criteria
■ Traffic assumptions
■ Link budgets
■ Deployment issues
■ Network node dimensioning
for the following three general types of systems:
■ CDMA2000-1x (green field)
■ IS-95 to CDMA2000-1x
■ CDMA2000-1x to 3x
It will be assumed throughout the entire chapter that migration of
legacy systems has been done successfully because it is not the intention of
this chapter to cover the design aspects of the various legacy wireless systems.
The reference section associated with this chapter, however, has several
excellent sources for obtaining legacy system design guidance and
examples.
With the previous said, the key factor that needs to be addressed, but
often one of the most difficult, is what do you want to do? It is a simple question,
but one that has profound implications with (all too often) no real
answer in response to the question. The questions posed are more a marketing
and business decision that are intertwined with the technical platforms
that exist for a wireless system. Therefore through the examples
listed next, it is hoped that the technical issues associated with the decisions
made for service and network deployments can be better weighed,
enabling for a better implementation of this exciting technology platform.