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5.6
5/1531-ANF 901 14 Uen D3 2013-11-28
If the dynamically channels selection algorithms in the different systems
are not tuned well, clicks, cracks, disturbances and dropped calls as well
as blocked calls will be the result. If the algorithms are well tuned the
user experience will not be as critical, however the radio capacity will still
be lower.
How this in all affects the end-users depends on how high traffic it is, how
dense the cell is with other systems and how important the communica-
tion is to the users work process. If the radio environment (in worst case)
is so extremely interfered or busy that the dummy bearer partly can not
find an available slot, then the users will experience that it is not possible
to neither make nor to receive calls and the portable devices will show
"No system" in the display until a dummy bearer is found and the
portable device has made a new registration to the system.
Planning Considerations
There is no doubt that a DECT multiple base station system is preferred
compared to a high number of single cell systems. How smooth a lot of
single cell systems will work depends on the traffic capacity need. With
low call rate more systems may be used, with high call rate fewer system
can be used. As the call rate increase sliding collisions appear more
frequently in un synchronized systems.
A recommendation is that when a multiple base station system is to be
installed, an inventory of existing systems shall be made and consider-
ation to move subscription of the residential portable devices to the
multiple base station system or to replace them all with portable devices
subscribed in the multiple base station system shall be made. In an office
environment with high call traffic only very few DECT systems may be
operational. In a low traffic environment a few residential base stations
may be used within the enterprise and will most certainly not be a
problem.
If un synchronized systems are installed, the radio units should be
placed as far as possible apart from each other to limit the interference.
Base stations from different systems shall if possible not be placed
directly beside or underneath each other.
A
A: M
PPENDIX
ULTIPLE
DECT
SYSTEM
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