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Part 1: Site Survey and Overview of DECT Systems
Function of Repeaters
A Repeater can be considered as a DECT unit, comprising a DECT handset and a
Base Station in one unit that can handle up to three traffic channels. The Repeater
has the same coverage as a normal Base Station.
A Repeater must be placed within the coverage area of the existing Base Station
and, therefore, extends the coverage of the Base Station by 50% (Figure 1.5).
Repeater
50% overlap
Base Station
50% increased coverage of
connected to the CCFP
the base station
Area 1
Area 2
Four Traffic Channels
Two Traffic Channels
Figure 1.5
When there is active traffic on the Repeater, it takes traffic channels from the Base
Station. Thus, the total number of traffic channels is neither increased nor reduced
with the Repeater.
When an active handset moves from Area 1 to Area 2 (Figure 1.5), the Repeater
takes over the active traffic channel and the handset can move around within Area 2
(within the coverage of the Repeater); however, as "seen" from the Base Station the
Repeater is now the active handset. When the active handset moves back to Area 1
and outside the coverage of the Repeater, the Repeater lets go of the active channel,
gives it back to the Base Station and there is a full handover between the Repeater
and the Base Station.
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