Customer goes for CSFB when ducting increases

4G LTE
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1

Hi All.

When ducting increases on a site customer continuously goes for CSFB. Why?

2

Since LTE layer is disturbed (TDD and/or FDD), it’s good to move to 3G/2G for Voice.

3

For us, we increased qrxlevmin in such case to control AFR.

But not sure if customer goes for csfb. Will check it.

4

We don’t have this we need to kept customer on 4G.

We just flip priority on this time.

5

UE redirection may occur from TDD to FDD.

To maintain PRB utilization in FDD, VoLTE load is offloaded by performing CSFB to lower layers.

6

We already set that early exit for qci1 from TDD towards FDD.

7

You can try load balancing feature which will take load into account.

Or service based handover.

I think load balancing consider only non gbr traffic seems not suitable for VoLTE so SBHO can be good option.