Increase the Handover attempt and success rate

218 0 0 0

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.

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.


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