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5. Move away from the DBS and check the RSSI value until it reads A0. Stop and mark this as
the border of the cell on the map. Note that:
When measuring RSSI values, hold the handset away from your body, pause for 2–3 seconds,
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take a reading and move on.
To avoid confusion, different cell boundaries should be marked with different line patterns,
!
e.g. dashed line, dotted line, etc. Do not use colours as these may be lost when photocopying.
For a multi-storey building it must be clear on what floor the DBS was positioned and that
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the result may be several cell contours on different floors.
6. Using the following numbering conventions, name the DBSs and cells and mark them on the
map.
xRyy : refers to the identity of the DBS, where
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x is the level (-1 is basement, 0 is ground, 1 is the 1st floor, etc)
R means this is a DBS
yy is the DBS position number. This number should be unique.
For example, a DBS on the 2nd floor and with position number 4 is identified as 2R04.
xCyy : refers to the identity of the cell, where
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x is the level at which the measurement was made (-1 is basement, 0 is ground, 1 is
the 1st floor, etc)
C means this is a cell
yy is the position number of the DBS being measured.
For example, if measurement is made on the 2nd floor and the measured base station
position number is 4, the identity of the cell is 2C04.
7. Repeat steps 1–6 for the remaining planned DBS positions. Cells should be at least adjacent to
each other. Overlap is not required except where traffic density demands this.
8. At this stage, it may be necessary to move some of the planned DBS positions or add new ones
to eliminate shadows or optimise cell size. If so, it may also be necessary to do additional meas-
urements to check that the new DBS positions do not create other problems.
Choose the DBS positions required. This may need to be done in consultation with a customer
engineer. In choosing DBS positions, the required cabling to the keyphone system should be
considered. DBS positions must be defined such that later installation problems are minimised.
9. Having completed the above procedures, install the DBSs in the positions marked on the map.
Some example cell planning results are shown at the end of this chapter.
Checklist for Survey Data
Building Characteristics (list for each building)
Building Characteristics (list for each building)
Building Characteristics (list for each building)
Building Characteristics (list for each building)
Building identification (refer to maps if available)
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What it is used for
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Dimensions (refer to maps if available)
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Number of floors
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Height of each floor
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Partitioning per floor
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Construction details
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3–5
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