How could we determine if the HO is delay or early?

Mobility
1

Hi Experts.

How could we determine if the HO is delay or early?

2

Based on HO event time trigger and T304 timer.

3

Can we see it in KPI? (If it is late or early?)

Or only in drive test?

4

In KPIs you have counters: too early or too late

There are counters for this:

  • L.HHO.NCell.HoToolate: Number of delayed intra-RAT handovers between two specific cells
  • L.HHO.NCell.HoToWrgCell: Number of intra-RAT handovers to a wrong cell between two specific cells
  • L.HHO.NCell.HoTooearly: Number of premature intra-RAT handovers between two specific cells
5

In the KPI you have to fetch counter late Handover and early Handover.

Wherever you found high count, this ho fails belongs to that category and to overcome it you have to tune parameter cell individual offset.

Which vendor you are working?

6

Usually MRO SON feature takes care of CIO and adjust their values to a proper HO success rate but this will degrade throughput.

Better proceed to proper tilts.

7

Ericsson.

8

Ericsson has those sort of counters too, not only Huawei.

9

I disable ANR, to prevent adding overshooters.

10

Based on whether RRC Re-establishment request is being sent to source or target

11

Measured by HO completion time - HO triggered time = delay / early