User guide
TD 92422GB
18 February 2010 / Ver. E
System Planning
Ascom IP-DECT System
8
6 Base Station Coverage
This section describes how architecture, building elements, and special areas affect the
coverage and the placing of the base stations.
The radio environment or the cell that is covered by a base station is not of a spherical
shape as often suggested in figures. If a snapshot could be taken of its form, it would
become clear that its shape is much more irregular. The momentary size and shape are
dependant on the material of which walls and floors are made, the position and material
of furniture, machines, air-conditioning and the position of the base station in such an
environment. Because of these unpredictable conditions it is not possible to give any hard
rules on calculating the number of base stations in a given situation.
• The in-house cell size in offices can have a radius of between 10 and 30 metres, see
figure 1 on page 8. The cell size in exhibition or production halls can have a radius of
up to 200 metres.
• The free space (outdoors) cell radius can be up to 300 metres.
• Base stations may partially cover the floors immediately above and below. The useful
range through floors and ceiling varies between 0 and 8 m (2 floors) radius; see
figure
1 on page 8.
6.1 Architecture
This section describes how the architecture of the building can affect the coverage.
• Central areas giving access to stairs and lifts may require extra base stations due to
heavier constructions.
• Coverage in lifts may require base stations closer to or in the lift shaft.
• Corners and irregularities in the construction such as partial renovation, extensions of
older buildings, and so on have influence.
• Concentration of air-conditioning ducts or other technical installations may influence
the field pattern and thus the coverage.
Figure 1. Example of the locations of base stations in a building.
40
metres
Base station 1
Base station 2
Base station 3
Front
view of a building
16 metres
Office
Office
Corridor
T
op view of top floor
Conference
room
Base
station 1
3.5
metre
s
Pantry
006