Chapter 21
Wireless Network Performance Assessment
The outcome of a design and optimization should be verified by a performance assessment. This assessment may show deficiencies that need to be corrected in the design; show that it complies with the requirements or that it was over-designed and can be made more economical.
21.1 Perform Dynamic Traffic Simulation
The Traffic Simulation process should reproduce what happens in a live system and this is an extremely complex endeavor. There are different ways in which a traffic simulation can be performed; one of the most common is by use of Monte Carlo simulation to randomly place calls/sessions throughout the service area and then run the simulation by repeating this multiple times. Each of these iterations is called a snapshot. The tool used as an example, CelPlanner, does a very detailed simulation through a sequence of instantaneous traffic snapshots; this process is described in the following paragraphs. The process of creating a snapshot is described in Section 21.1.1.
Ideally, the design tool should automatically determine the throughput required throughout the market area based on the distribution of subscribers of each profile (Service Classes).
During traffic simulation, random draws must take place to distinguish users status as Connected (subscriber equipment is on, ongoing session) and Not Connected (not in a session). Next, connected subscribers are categorized as Active Sessions (in a burst, possibly holding traffic ...
