Mobile radio networks have traffic issues that do not arise in connection with the fixed line PSTN.
This method is called cell splitting (and combined with sectorization) is the only way of providing services to a burgeoning population.
This simply works by dividing the cells already present into smaller sizes hence increasing the traffic capacity.
Mobile radio networks are operated with finite, limited resources (the spectrum of frequencies available).
Sectorization is briefly described in traffic load and cell size as a way to cut down equipment costs in a cellular network.
[1] This is because the power radiated backward from a directional base station antenna is minimal and interfering with adjacent cells is reduced.
Let a case of Code Division Multiple Access be considered for the relationship between traffic capacity and coverage (area covered by cells).
CDMA cellular systems can allow an increase in traffic capacity at the expense of the quality of service.
DCA is a better way not only for handling bursty cell traffic but also in efficiently using the cellular radio resources.
Important parameters like the carrier-to-interference ratio (C/I), spectral efficiency and reuse distance determine the quality of service of a cellular network.
In industry, a good approximation of the channel holding time is usually sufficient to determine the network traffic capability.
[3] Since the channel holding time and call duration relationships are affected by mobility and cell size, for a stationary MS and large cell sizes, channel holding time and call duration are the same.