# Increase the Handover attempt and success rate

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Problem Description:

The Handover attempts are low from cell 222 to 223 : need to increase HO attempts and success from 222 to 223.
The Handover attempts are low from cell 223 to 224 : need to increase HO attempts and success from 223 to 324.
The Handover attempts are low from cell 324 to 323 : need to increase HO attempts and success from 324 to 323.
The Handover attempts are low from cell 323 to 322 : need to increase HO attempts and success from 323 to 322.

Problem Analysis:

1.     Collect the counter and analysethe specific analysis is as follows:

l  222-223:

In the handover request, the target cell is switched to 323 and 321 which larger. The configuration of the adjacent neighbor parameter is adjusted as follows:

MOD G2GNCELL:SRC2GNCELLID=222, NBR2GNCELLID=2053, IDTYPE=BYID, INTERCELLHYST=72, MINOFFSET=0, PBGTMARGIN=72,

MOD G2GNCELL:SRC2GNCELLID=222, NBR2GNCELLID=2055, IDTYPE=BYID, INTERCELLHYST=72, MINOFFSET=0, PBGTMARGIN=72,

 Row label H370C:Outgoing Inter-Cell Handover Requests H373:Successful Outgoing Inter-Cell Handovers H372:Failed Outgoing Inter-Cell Handovers H374I:Outgoing Inter-Cell Handover Requests (Better Cell) 222-220 0 0 0 0 222-221 1 1 0 1 222-223 69 69 0 69 222-321 138 138 0 138 222-323 82 82 0 82

l  223-224

The cell handover request is normal, but other causes and downlink quality in the number of requests are relatively large, indicating that the 223 cell has obvious low quality, it is necessary to dial the test for the 223 coverage area to check the downlink interference.

MOD G2GNCELL:SRC2GNCELLID=223, NBR2GNCELLID=222, IDTYPE=BYID, INTERCELLHYST=72, MINOFFSET=0, PBGTMARGIN=72,

MOD G2GNCELL:SRC2GNCELLID=223, NBR2GNCELLID=224, IDTYPE=BYID, INTERCELLHYST=68, MINOFFSET=0, PBGTMARGIN=68,

PBGTMARGIN=68,

 Row label H370C:Outgoing Inter-Cell Handover Requests H373:Successful Outgoing Inter-Cell Handovers H372:Failed Outgoing Inter-Cell Handovers H374B:Outgoing Inter-Cell Handover Requests (Downlink Quality) H374I:Outgoing Inter-Cell Handover Requests (Better Cell) H374L:Outgoing Inter-Cell Handover Requests (Other Causes) 223-222 10 10 0 0 10 0 223-224 71 71 0 6 55 10 223-322 1 1 0 0 1 0 223-324 0 0 0 0 0 0

l  323-324

In the handover request, the target cell is switched to 222 and 224 is larger. The configuration of the adjacent neighbor parameter is adjusted as follows:

MOD G2GNCELL:SRC2GNCELLID=323, NBR2GNCELLID=2050, IDTYPE=BYID, INTERCELLHYST=72, MINOFFSET=0, PBGTMARGIN=72,

MOD G2GNCELL:SRC2GNCELLID=323, NBR2GNCELLID=2052, IDTYPE=BYID, INTERCELLHYST=72, MINOFFSET=0, PBGTMARGIN=72,

l  324-323

The cell handover request is normal, but other causes and downlink quality in the number of requests are relatively large, indicating that the 223 cell has obvious low quality, it is necessary to dial the test for the 324 coverage area to check the downlink interference

 Row label H370C:Outgoing Inter-Cell Handover Requests H373:Successful Outgoing Inter-Cell Handovers H372:Failed Outgoing Inter-Cell Handovers H374B:Outgoing Inter-Cell Handover Requests (Downlink Quality) H374I:Outgoing Inter-Cell Handover Requests (Better Cell) H374L:Outgoing Inter-Cell Handover Requests (Other Causes) 323-222 129 129 0 0 129 0 323-224 87 87 0 0 82 5 323-225 1 1 0 0 1 0 323-322 17 17 0 0 17 0 323-324 3 3 0 0 0 3 323-325 0 0 0 0 0 0 324-223 12 12 0 1 0 11 324-225 3 3 0 0 3 0 324-323 143 143 0 15 87 41 324-325 2 0 2 0 0 2

2.     After adjusting the parameter, collect the counter and analyse again. Through the comparison of data before and after adjustment, it is found that the HO attempt of the target cell has not been significantly improved, the UE still prefers to initiate handover from 222 to 321 and 323

3.     The current parameters have been adjusted to the maximum suppression range, signal strength of CELL 321 and 322 may be too strong, so we suggest to do a field test, and according to the condition of signal coverage, adjust the antennas to shrink the coverage of 321, 323, 222, 224 cells

Root Cause:

Adjust the antennas to change the signal couverage, the HO attempt of target celland success will be increased.

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