User's Manual

5 Radio Network Planning
APCD-LM043-4.0 71
5.3.6 Summary of RF Design Guidelines
A summary of guidelines presented in this chapter can be found in Table 14.
Table 14 Summary of RF Design Guidelines
DO DO NOT
• DO read and understand this chapter
before you start your system design
activity.
• DO contact WaveRider Professional
Services Group if you need assistance
with spectral surveys, RF coverage
analyses, or system engineering.
• As a first step, always DO a spectral
survey.
• DO understand the RF environment in
your serving area, and DO learn as
much as you can about potential
sources of interference.
• DO verify your system design through
field testing, prior to turning up the
service to end users.
• DO try to design your system to take
advantage of your existing real estate
or radio sites.
• DO use bandpass filters to reduce the
effect of off-channel in-band and out-of-
band interference.
• DO use different frequency
assignments or take advantage of
antenna patterns to address on-
channel interference.
• Wherever you can, DO use the
standard frequency set.
• In the design of multi-CAP networks,
DO maintain the required C/I ratio
shown in Table12onpage68.
• In a multi-CAP network, DO use a
minimum frequency offset of 0.2MHz
between CCUs.
• DO migrate from an omnidirectional to
a sectored cell when your traffic
warrant it, or interference is an issue.
• DO NOT assume a static RF
environment.
• DO NOT install the CAP site in
proximity to in-band or out-of-band
interferers.
• DO NOT install the CAP site in a low
area, or area surrounded by clutter and
obstructions.
• DO NOT use frequencies that are close
to the edges of the ISM band if you
have identified cellular and paging
transmitters above or below the band.
• DO NOT ignore the usage patterns of
your end users when designing your
network.
• DO NOT assign the same frequency to
two or more CCUs in your network.