【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 analyse，the 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.
The configuration of the adjacent neighbor parameter is adjusted as follows:
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.
