Network Design Principles
Figure 12-1 shows the overall network design and deployment process at a
very high level.To begin with, we must specify a number of criteria regarding
the set of services that we wish to provide and the estimated demand for
those services.We must establish exactly where we wish to offer those services,
and we must establish any limiting factors that might constrain our
ability to meet all objectives—such as spectrum limitations.
Based on the established input requirements, a number of network
design activities take place. These can largely be broken into two main
areas—radio frequency (RF) network design and core network design. Of
course, within each of these areas there is a myriad of individual design
Once designs are established, implementation is undertaken. This largely
involves the RF network implementation, core network implementation,
integration, and optimization. Quite often during the implementation phase,
one finds that it is not possible or optimal to deploy the system exactly as
designed, in which case the design itself needs to be modified. There are
many reasons why designs might need to be changed—such as an inability
to acquire a Node B site in the exactly desired location, coverage or quality
problems discovered during integration or optimization, and so on.
Finally, statistics and measurements generated during the performance of
the operational network should be fed back to those who generate the design
inputs and also to those who are responsible for the system design. This
enables revised requirements related to design modifications, expanded coverage,
capacity, or service demand to be based upon real experience.
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