Nortel Networks DCT1900 User Manual

Page 118

Technical Product Manual - DCT1900

Configuration Directions, Base Station Planning

3-4

Config-DCT1900/R8/mw

Measure horizontal range on floor below, see Figure 3–2, (3).

Go to the floor below, leaving the Base Station on its current location and measure the
horizontal coverage again.

Note:
If the building is quite transparent to radio signals, the vertical coverage can reach to another floor
above and below.

In this way the horizontal and vertical coverage of a single Base Station in a typical area is found.
The cell size found can be taken as an average and used to calculate the total number of Base
Stations. From Figure 3–2 it is clear that three Base Stations can cover a building as seen in
Figure 3–1.

Depending on the size of the building and the type of construction, one or two more "random
checks" in typical areas can be done to verify the first measurement. The typical cell size is then
found by averaging the values.

Fig. 3–2 Measurement of Typical Cell Size

Making a plan
-

With the "typical cell size" found, make a sketch of all Base Station positions on the floor

plan. Indicate the expected coverage for each Base Station on the map.

Verify with the Site Survey Tool if the real coverage is as expected from the map.

Especially verify coverage in difficult areas such as elevators, stairways and

discontinuities in construction.

If weak areas are found, see if re–positioning of Base Stations solves it; otherwise, plan an

extra base station.

Take into consideration that in free space, with antennas in upright position, the coverage

is horizontal more than vertical. Although in normal office environments this effect is

negligible due to the amount of reflections, it still may be worth trying to place Base

Stations horizontally in order to get more vertical coverage such as in stairways.

132 ft.

11.4 ft.

Base Station of Demo Case

1= 132 ft.
2= 66 ft.
3= 66 ft.