Look for this parameter:
And counters:
SRB is the signaling that carry messages signaling that you can calculate in major KPIs (RRC, NAS…).
Note: there is SRB0, SRB1 & SRB2 in LTE.
In 5G, there is the same + SRB3 (new one).
SRB concept there is Ericsson system for RRC & NAS signaling.
Yes SRB is signalling Radio Bearer agreed.
The thing that I was speaking about was Scheduling Resource Blocks.
Lets keep same understanding SRB is Signalling Radio Bearer only.
A scheduling block consists of two RBs adjacent in time and with the same subcarriers.
A scheduling block is the smallest downlink unit that can be scheduled to UE.
Yes its agree scheduling block is smallest allocated unit ie PRB.
It’s not SRB.
At least 1 PRB to UE.
So we were actually confusing between SRB and SB here?
Yes, I was talking about this.
It’s all clear now, thanks. 
Hello Experts,
I’ve added this information here Radio Physical Resources 