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8.5.3. Repeater Commissioning
Testing Effective Downlink Path Loss
The downlink path loss between NODE B and the donor antenna is as follows:
L
D-link
= P
NODE B
- P
donor
(P
donor
is the downlink signal power received at the donor end)
Suppose: The maximum transmitting power of NODE B is 20 W and the overhead power accounts for
10%. When there is no traffic, the transmitting power of NODE B is as follows:
P
NODE B
=20W*10%=2W=33 dBm
The effective downlink path loss is as follows:
L
D-link
=33- P
donor
Budgeting Maximum Uplink Low Noise Power Output at Donor Port of Repeater
Therefore the repeater UL gain shall be G
up
≤
L
D-link
–NF , (NF is the repeater Uplink Noise figure)
Suppose G
noise
= L
D-link
–NF.
Downlink gain setting
There are three factors to be followed to set DL gain of indoor repeater:
A. Meet with isolation requirement of G1= L
ISO
-10dB
。
The repeater’s gain shall be less than “Isolation I -10dB”, and if it allows, the gain shall be less
than “Isolation I -15dB”
B. Meet with UL noise G
noise
The UL noise from the repeater shall be less than the thermal noise floor when reaching
NODE B tower.
C. The DL gain G2 shall be set so that the repeater can reach its full downlink output power
D. Finally to set the gain G
DL
= MIN
（
G1
，
G
noise
+8dB
，
G2
）
UL Gain G
UL
= MIN
（
G1
，
G
noise
，
G2
）
Downlink gain setting procedures:
A. Use engineering mobile phone to test the input signal strength at the repeater’s NODE B port,
in order to get the exact values of P
NODE B PORT P-CPICH
.
B. The gain to meet the targeted output power
