LTE X2 Handover failure reason cause handover-target-not-allowed

Mobility
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1

Hi Experts.

Does any one can explain the further drill down of the LTE X2 Handover failure reason cause handover-target-not-allowed?

Vendor Huawei

1 Like
2

Maybe for some visited users, some TACs aren’t allowed and after HO to restricted TACs, HO will reject by this cause.

3

So you mean to say that rejection totally based on Core end, not Radio end?

I have checked 3GPP documents but just found this thing Handover Target not Allowed Handover to the indicated target cell is not allowed for the UE in question.

4

Yes usually it’s based on Core.

5

If target cell doesn’t support the service like ENDC or VoLTE, you may get this message.

6

ENDC is not available, and target all cells supporting VoLTE and working fine, 95% failures seen on QCI9.

7

Hello, did you find the reason and solution?

8

In my case what happened was source cell was Huawei cell and neighbor cell was Ericsson one, and HO was failing only to 1 cell of that site, after analyzing it was found that target cell was configured on dual frequencyband BAND 12 & BAND 17. and in trace message request was going towards band 12 configured frequency cell, So from Huawei side we removed the slave Frequencyband configuration for testing purpose for neighbor cell and its miracle ,now all HO execution success rate is 100% now.