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Part 1: Site Survey and Overview of DECT Systems
Base Station Area 1
In Figure 1.6 an installation with two Repeaters and two Base Stations is shown. An
active handset can move from Area 1 to Area 4 without losing its call since handover
is made from the Base Station in Area 1 to the Repeater in Area 2, then to the Re-
peater in Area 3 and then to the Base Station in Area 4.
This means that the installation gives a wider spread of the area of traffic channels
without having to add extra channels.
Repeaters in Multi-Cell Systems
When a multi-cell system is installed, two considerations determine the number of
Base Stations:
1.
Establishment of necessary radio coverage.
2.
The number of traffic channels must be available to secure good perform-
ance of DECT traffic.
To fulfil point 2, under normal circumstances, one Base Station should be installed
per 10 handsets. In a busy office the system will be able to handle traffic of 0.15E per
handset registration, corresponding to an average of nine minutes per hour (ap-
proximately five calls per hour) with a blocking value of 1%
Repeater Area 2
Repeater Area 3
Figure 1.6
Base Station Area 4
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