Fujitsu 5GRUDB3 User Manual page 62

RU Hardware Feature
TX Control Function
In order to reduce power consumption, the RU controls the drain voltage of the power amp in accordance with
the transmission mode. The drain voltage is switched according to the transmission output power of each band.
The transmission output power of each band is checked by the DL Gain value in the M-plane "TX-Array-Carrier"
message.
When transmission carrier setting is added or changed during operation and switching of transmission mode
occurs, transmission is turned off to change drain voltage, and transmission control is performed again after
switching drain voltage.
The following flow image is sample for 3 carriers, maximum 60 W at n66.
Host System
M-Plane
Established
Tx-Array-Carrier-01
Message
Tx-Array-Carrier-02
Message
Tx-Array-Carrier-03
Message
·
Issue 1.1, May 2021
Release 1.0
Dual-Band RU
M-Plane
Established
Port #A n66
DL Gain: Maximum
Output Power -3db
Total 3 Carriers
Port #A
Maximum Output Power =
Port #A n66
47.8dBm (60W)
DL Gain: Maximum
n66 at Port #A is 60W,
Output Power -6db
so Port #A Transmit Mode is
(ii)n70 + n66: 20W + 60W
Port #A n66
DL Gain: Maximum
Output Power -6db
No
M66 Maximum
Output Power
< 40W?
Switch Power Mode
Yes
n70 + n66: 20W + 60W
i) -> (ii)
62
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