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Part 1: Site Survey and Overview of DECT Systems
Erlang = E.
3 calls per hour, lasting 3 mins (3 calls x 3 mins)/60 min = 0.15 E
40 x 0.15 = 6 E
With 1% rejection, 6 E equals 12 channels according to the Erlang table
(Appendixes
1 and
2).
A Base Station has 4 channels: 12/4 = 3 Base Stations per cell (Figure 1.4)
Figure 1.4
Troubleshooting with Base Stations
Here are some examples of situations in which problems such as lost calls, bad call
quality or not being able to go off-hook may occur.
Example 1: Several small overlap areas
If you are in an area with a lot of small
overlaps and you are moving in a given
direction, there is a risk of losing the call
because the Base Station which the
handset has as its alternative may not
necessarily be the Base Station that
you are moving towards. This can be
solved by placing a Base Station in the
middle of the area.
15
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