Traffic Calculation Methods

An operator can pursue several methods for estimating the amount of voice
and packet traffic with regards to implementing CDMA2000 1xRTT. A
more robust discussion with some examples is included in Chapter 13,
“CDMA2000 System Design,” but the following concepts are approached.
However, the key point to address is that without specific applications that
the system is trying to address, the estimation of traffic is rather dubious
since it bases several assumptions upon each other.

Traffic calculations are done in two methods: the forecast and discovery
approaches. The forecast approach involves a detailed analysis of
existing voice traffic and, by working with the marketing and subscriber
sales force, a take rate and an estimated bandwidth for each subscriber
can be achieved. This then is distributed across the regions or appropriate
BTSs to arrive at the appropriate forecasted traffic volume, which
then can be equated into channel elements, 1x/DO deployment schemes,
and so on.
The other approach is the discovery approach where, in the core of the
network, a 1x channel replaces either the F1 or F2 channels that are
already deployed. Here you determine the number of mobiles that will be
1xRTT-capable and then multiply that number by 70 Kbps.You can assume
that each mobile will be operational during the busy hour initially and you
can weigh the traffic volume over the BTSs involved with upgrading to
CDMA2000.