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Part 1: Site Survey and Overview of DECT Systems
Repeaters as Problem Solvers in Multi-Cell Systems
Typical problems with multi-cell systems are:
•
Missing radio coverage
•
Missing traffic capacity
One of the typical problems is lack of coverage even after the site survey showed no
problems. This could be because in multi-cell systems some of the cells may inter-
fere with each other; the Base Station may not have been installed in exactly the
same location as the survey Base Station during the site survey; or when the building
is busy (especially in the case of warehouses) shelving, racking and stored goods
may influence the radio coverage.
The radio coverage is not the same all year, as coverage may depend on humidity or
building material. Therefore, a DECT system must be installed with a security overlap
between coverage areas which can cause a rise in overall installation costs.
Repeaters are excellent tools for adjusting multi-cell installations: they are easy to
install and move, as they need no cabling.
Installation of Repeaters with External Directional Antenna
The Repeater can be installed with an external directional antenna so it can be used
to create radio coverage in a remote building or area (Figure 1.13). With a standard
antenna, coverage can be extended to a distance of around 1,000 metres, but this
may be greater or less if a higher or lower gain antenna is used. This is useful where
cabling is not possible or too expensive to install (Figure 1.14).
When the Repeater does not have to hand over, the Repeater can be programmed to
repeat up to three traffic channels.
Figure 1.13
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