Hi Sayed,
You say 20% in RX utilization and 40% in “RX” utilization… Did you mean “TX” instead ?
Are you talking about the Air interface ?
If yes:
It might be due to more messages being send from the BTS to the MS rather than the other way around. Unless you have a high SDCCH drop rate, I don’t think it shows a critical condition of your signalling links.