2.8
TX Control Function
Tx Power Control
e output power of the RU is set and controlled remotely via M-plane on ORAN interface. e output power of
the RU is controlled by 1 dB steps for each band and for each TX port (the controllable range is 10dB from the
maximum TX power for a single carrier).
Cold Start
When the system temperature at startup is −40 to −20 ℃, the system reports to the EMS as a Cold Start state
(refer to
RU Alarms). RF transmission is not operating and power amp is set to on for warmup.
e temperature is monitored from the start of the device, and the Cold start state is released when the
temperature reaches −20 ℃ and reported to the EMS.
TX Power Reduction
e RU supports the TX power reduction on switching to baery backup at the cell site. e TX power reduction
is congured by DL Gain control (controllable range is 3 dB) for each band via M-plane message.
When the power source is restored from baery backup, the RU resume normal operation before switching to
baery backup automatically by DL Gain controlling from host system.
In case the power source is restored aer power loss, the RU resumes normal operation at the condition before
power loss automatically as well as any other seings, for example, frequency and output power via M-plane
control from host system.
Transmission Blanking
e RU supports transmission blanking by PA on/o control for each RF port via C-plane control from host
system.
In case of warmup status, for example, cold start, PA on is set without transmission output regardless of C-plane
control from host system.
Drain Voltage Control
Dual-band RU has a transmit power of 80 W/Port and has two transmit modes, depending on the transmit power
of each band.
1. n70 + n66: 20 W + 60 W
2. n70 + n66: 40 W + 40 W
RU Hardware Feature
TX Control Function
61
Release 1.0 · Issue 1.1, May 2021
Fujitsu and Fujitsu Customer Use Only
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General