26
Taking measurements
If you have measured the cells of several base stations, the results may look like this, for
example:
Measuring points where two base stations are received with at least –65 dBm are located
in an overlap zone of the two base stations in which a handover is possible (highlighted
grey in the table).
Measuring the synchronisation overlap of neighbouring base
stations
For the base stations to be able to synchronise, the signal strength between two neigh-
bouring base stations must not be less than –70 dBm. This value applies in good environ-
mental conditions,
.
Proceed as follows for the measurements:
¤
Leave the measuring base station at the last measuring site and proceed with the
handset to the planned position of a base station that is to synchronise with the first
base station.
In order to reliably assess the synchronisation, you must be located, with the handset,
at the exact position of the planned base station (use a ladder to measure at the cor-
rect height, if necessary).
¤
Check whether the signal is within the limit of -70 dBm at 100% frame quality. If this is
not the case, you should change the location of the base station until this minimum
requirement is met.
Measuring
point
Base station A
Base station B
Base station C
Base station D
1
–60 dBm/100%
2
–50 dBm/98%
3
–65 dBm/100%
4
–48 dBm/100%
5
–55 dBm/98%
6
–65 dBm/100%
–50 dBm/100%
7
–68 dBm/96%
–59 dBm/100%
8
–55 dBm/98%
–46 dBm/98%
9
–60 dBm/96%
10
–52 dBm/98%
–65 dBm/100%
11
–63 dBm/100%
–57 dBm/100%
12
–48 dBm/98%
–42 dBm/100%
13
–46 dBm/98%
14
–40 dBm/100%
15
–60 dBm/98%
–52 dBm/100%
16
–43 dBm/100%
–42 dBm/100%
17
–56 dBm/100%
18
–50 dBm/98%
19
–53 dBm/100%
20
–60 dBm/98%
VoIPon www.voipon.co.uk [email protected] Tel: +44 (0)1245 808195 Fax: +44 (0)1245 808299
