User’s Manual for Node C Network Elements
Page 62
PRELIMINARY M0121A1A_uc.doc
b) Typical Tuning Procedure (See example table below):
1. Point the donor antenna in the general direction of the donor base station.
2. Start the AAA.
3. Verify that the reported DL Rx Power is above –90dBm. If not, orient the antenna
until the signal is above –90dBm.
4. Wait for Pilot RSCP results to be reported (indicating that a valid pilot has been
found).
5. Verify that the ARFCN and frequency reported at the top of the table matches the
ARFCN and frequency of the donor base station.
6. Orient the antenna to maximize the Pilot RSCP from the donor base station.
Usually, the best method is to course-tune the antenna based on DL Rx Power
measurements and then fine-tune based on Pilot RSCP measurements.
However, if multiple pilots are present, then using the DL Rx Power
measurements alone may not work well, and the user will have to rely on Pilot
RSCP only.
7. If multiple rays are present, then it is usually best to orient the antenna to
maximize the level of the first ray (the line-of-sight – or LOS – signal). However, if
the first ray is not the strongest signal, then there is an obstruction in the LOS
signal, and the strongest signal is a multipath component. This may mean that the
donor signal is prone to fluctuation, resulting in sub-optimal performance of the
unit.
Assisted Antenna Tuning
Channel 12345 , 2100 MHz
DL Rx
Power
(dBm)
RSCP of
Pilot 111
(dBm)
RSCP of
Pilot 111
(dBm)
RSCP of
Pilot 333
(dBm)
RSCP of
Pilot 444
(dBm)
Multipath
Componen
t
1st Ray
2nd Ray
1st Ray
1st Ray
-80
- - - -
-80
- - - -
-80
-91 -92 -93 -94
-80
- - - -
-80
- - - -
-80
- - - -
-80
-91 -92 -93 -94
-80
- - - -
-80
- - - -
-80
- - - -
-80
-90 -91 -92 -93
-80
- - - -
-80
- - - -
-80
- - - -
-80
-90 -91 -92 -93
table 4-1 Assisted antenna tuning
