CS-IRAT-Optimization.pdf

Security Level: Internal

CS IRAT Optimization

www.huawei.com

HUAWEI TECHNOLOGIES CO., LTD.

Huawei Confidential

CS IRAT HO Success Rate (%) Phenomenon description :

RNC N „s CS IRAT has been degraded since 22 December 2011 caused by site BANPMU , BANGMU and ATOMMU which have neighbor relation towards problematic 2G cells, BANPM1_3 , BANGM1_1.Suspect 2G cells have high congestion problem.

CS IRAT HO Success Rate (%) CellId

CellName

8.M - CS Inter-RAT Handover Success Rate(W2G)(%)

8.M - CS Inter-RAT Handover Success Rate(W2G)(nom)

8.M - CS Inter-RAT Handover Success Rate(W2G)(denom)

CS IRAT Failure

35162

ATOMMU_2

81.51%

1278

1568

290

287

13

35167

ATOMMU_7

83.12%

1152

1386

234

231

18

39142

BANPMU_2

34.89%

298

854

556

553

5

39143

BANPMU_3

75.44%

949

1258

309

302

14

39147

BANPMU_7

38.05%

218

573

355

353

7

39148

BANPMU_8

72.28%

790

1093

303

301

11

35191

BANGMU_1

98.74%

7309

7402

93

86

122

35196

BANGMU_6

94.48%

7907

8369

462

454

107

IRATHO.FailOutCS IRATHO.FailRelocPrep .PhyChFail OutCS.NoResAvail

The TopN worst cells have majority failure due to Physical Channel Fail and BANGMU_1 and BANGMU_6 have high IRATHO.FailReloc.Prep.Out.CS.NoResAvail that the neighbor co sector 2G site has high GSM900 blocking

 Action Taken : Changed Inter RAT HO Physical Channel Failure Threshold for the listed TopN worst cells InterRatPhyChFailNum from 3 to 1 Changed the priority of the GSM Neighbor cell from default ( None) to 30 for BANGMU_1 > BANGM1_1 and BANGMU_6 > BANGM1_1 MOD GSMNCELL: RncId=106, CellId=35191, GSMCellIndex=12431, NPrioFlag=TRUE, NPrio=30;

CS IRAT HO Success Rate (%) KPI Monitoring: Cell ATOMMU_2 > BANPM1_3 and ATOMMU_7 > BANPM1_3 CS IRAT Failure Reduce after the changes done on 28 December RNCId 106 106 106 106 106 106 106 106 106 106 106 106 106 106 106 106 106 106 106 106

3G Cell ID 35162 35162 35162 35162 35162 35162 35162 35162 35162 35162 35167 35167 35167 35167 35167 35167 35167 35167 35167 35167

3G Cell Name GSM LAC_Cell ID GSM Cell Name ATOMMU_2 2001_5243 BANPM1_3 ATOMMU_2 2001_5243 BANPM1_3 ATOMMU_2 2001_5243 BANPM1_3 ATOMMU_2 2001_5243 BANPM1_3 ATOMMU_2 2001_5243 BANPM1_3 ATOMMU_2 2001_5243 BANPM1_3 ATOMMU_2 2001_5243 BANPM1_3 ATOMMU_2 2001_5243 BANPM1_3 ATOMMU_2 2001_5243 BANPM1_3 ATOMMU_2 2001_5243 BANPM1_3 ATOMMU_7 2001_5243 BANPM1_3 ATOMMU_7 2001_5243 BANPM1_3 ATOMMU_7 2001_5243 BANPM1_3 ATOMMU_7 2001_5243 BANPM1_3 ATOMMU_7 2001_5243 BANPM1_3 ATOMMU_7 2001_5243 BANPM1_3 ATOMMU_7 2001_5243 BANPM1_3 ATOMMU_7 2001_5243 BANPM1_3 ATOMMU_7 2001_5243 BANPM1_3 ATOMMU_7 2001_5243 BANPM1_3

Ti me(As day) VS.IRATHO.AttOutCS.N VS.IRATHO.SuccOutCS.N CS IRAT Failure 2011-12-24 82 0 82 2011-12-25 65 0 65 2011-12-26 53 1 52 2011-12-27 71 0 71 2011-12-28 63 35 28 2011-12-29 70 70 0 2011-12-30 79 79 0 2011-12-31 58 58 0 2012-01-01 46 46 0 2012-01-02 61 61 0 2011-12-24 67 1 66 2011-12-25 55 1 54 2011-12-26 45 1 44 2011-12-27 59 1 58 2011-12-28 65 31 34 2011-12-29 57 57 0 2011-12-30 56 56 0 2011-12-31 73 72 1 2012-01-01 58 58 0 2012-01-02 54 53 1

CS IRAT HO Success Rate (%) Cell BANPMU_2_7_3_8 > BANPM1_3 CS IRAT Failure reduce after the changes done on 28 Dec RNCId 106 106 106 106 106 106 106 106 106 106 106 106 106 106 106 106 106 106 106 106 106 106 106 106 106 106 106 106 106 106 106 106 106 106 106 106 106 106

3G Cell ID 39142 39142 39142 39142 39142 39142 39142 39142 39142 39142 39143 39143 39143 39143 39143 39143 39143 39143 39143 39143 39147 39147 39147 39147 39147 39147 39147 39147 39147 39147 39148 39148 39148 39148 39148 39148 39148 39148

3G Cell Name BANPMU_2 BANPMU_2 BANPMU_2 BANPMU_2 BANPMU_2 BANPMU_2 BANPMU_2 BANPMU_2 BANPMU_2 BANPMU_2 BANPMU_3 BANPMU_3 BANPMU_3 BANPMU_3 BANPMU_3 BANPMU_3 BANPMU_3 BANPMU_3 BANPMU_3 BANPMU_3 BANPMU_7 BANPMU_7 BANPMU_7 BANPMU_7 BANPMU_7 BANPMU_7 BANPMU_7 BANPMU_7 BANPMU_7 BANPMU_7 BANPMU_8 BANPMU_8 BANPMU_8 BANPMU_8 BANPMU_8 BANPMU_8 BANPMU_8 BANPMU_8

GSM LAC_Cell ID 2001_5243 2001_5243 2001_5243 2001_5243 2001_5243 2001_5243 2001_5243 2001_5243 2001_5243 2001_5243 2001_5243 2001_5243 2001_5243 2001_5243 2001_5243 2001_5243 2001_5243 2001_5243 2001_5243 2001_5243 2001_5243 2001_5243 2001_5243 2001_5243 2001_5243 2001_5243 2001_5243 2001_5243 2001_5243 2001_5243 2001_5243 2001_5243 2001_5243 2001_5243 2001_5243 2001_5243 2001_5243 2001_5243

GSM Cell Name BANPM1_3 BANPM1_3 BANPM1_3 BANPM1_3 BANPM1_3 BANPM1_3 BANPM1_3 BANPM1_3 BANPM1_3 BANPM1_3 BANPM1_3 BANPM1_3 BANPM1_3 BANPM1_3 BANPM1_3 BANPM1_3 BANPM1_3 BANPM1_3 BANPM1_3 BANPM1_3 BANPM1_3 BANPM1_3 BANPM1_3 BANPM1_3 BANPM1_3 BANPM1_3 BANPM1_3 BANPM1_3 BANPM1_3 BANPM1_3 BANPM1_3 BANPM1_3 BANPM1_3 BANPM1_3 BANPM1_3 BANPM1_3 BANPM1_3 BANPM1_3

Time(As day) 2011-12-24 2011-12-25 2011-12-26 2011-12-27 2011-12-28 2011-12-29 2011-12-30 2011-12-31 2012-01-01 2012-01-02 2011-12-24 2011-12-25 2011-12-26 2011-12-27 2011-12-28 2011-12-29 2011-12-30 2011-12-31 2012-01-01 2012-01-02 2011-12-24 2011-12-25 2011-12-26 2011-12-27 2011-12-28 2011-12-29 2011-12-30 2011-12-31 2012-01-01 2012-01-02 2011-12-24 2011-12-25 2011-12-26 2011-12-27 2011-12-28 2011-12-29 2011-12-30 2011-12-31

VS.IRATHO.AttOutCS.N 139 147 131 123 115 104 121 108 68 106 83 65 72 85 105 91 70 47 55 64 96 66 72 108 99 74 64 90 56 67 85 51 78 81 83 61 79 68

VS.IRATHO.SuccOutCS.N 2 0 0 0 55 104 121 108 68 106 1 1 1 1 54 91 69 47 55 63 1 0 0 0 49 74 64 90 56 67 0 1 0 0 33 60 79 68

CS IRAT Failure 137 147 131 123 60 0 0 0 0 0 82 64 71 84 51 0 1 0 0 1 95 66 72 108 50 0 0 0 0 0 85 50 78 81 50 1 0 0

CS IRAT HO Success Rate (%) Cell BANGMU_1_6 > BANGM1_1 CS IRAT Failure slightly reduce and noticed that the CS IRAT  Attempt towards the 2G cells has slight reduce as well. RNCId

3G Cell ID

3G Cell Name GSM LAC_Cell ID GSM Cell Name Ti me(As day) VS.IRATHO.AttOutCS.N VS.IRATHO.SuccOutCS.N CS IRAT Failure

106

35191

BANGMU_1

2024_12431

BANGM1_1

2011-12-24

942

930

12

106

35191

BANGMU_1

2024_12431

BANGM1_1

2011-12-25

837

831

6

106

35191

BANGMU_1

2024_12431

BANGM1_1

2011-12-26

907

903

4

106

35191

BANGMU_1

2024_12431

BANGM1_1

2011-12-27

1078

1064

14

106

35191

BANGMU_1

2024_12431

BANGM1_1

2011-12-28

939

936

3

106

35191

BANGMU_1

2024_12431

BANGM1_1

2011-12-29

763

757

6

106

35191

BANGMU_1

2024_12431

BANGM1_1

2011-12-30

711

706

5

106

35191

BANGMU_1

2024_12431

BANGM1_1

2011-12-31

810

804

6

106

35191

BANGMU_1

2024_12431

BANGM1_1

2012-01-01

588

584

4

106

35191

BANGMU_1

2024_12431

BANGM1_1

2012-01-02

582

578

4

106

35196

BANGMU_6

2024_12431

BANGM1_1

2011-12-24

1074

1052

22

106

35196

BANGMU_6

2024_12431

BANGM1_1

2011-12-25

886

863

23

106

35196

BANGMU_6

2024_12431

BANGM1_1

2011-12-26

962

901

61

106

35196

BANGMU_6

2024_12431

BANGM1_1

2011-12-27

1223

1175

48

106

35196

BANGMU_6

2024_12431

BANGM1_1

2011-12-28

843

840

3

106

35196

BANGMU_6

2024_12431

BANGM1_1

2011-12-29

854

844

10

106

35196

BANGMU_6

2024_12431

BANGM1_1

2011-12-30

895

874

21

106

35196

BANGMU_6

2024_12431

BANGM1_1

2011-12-31

765

760

5

106

35196

BANGMU_6

2024_12431

BANGM1_1

2012-01-01

648

644

4

106

35196

BANGMU_6

2024_12431

BANGM1_1

2012-01-02

755

751

4

CS IRAT HO Success Rate (%)

KPI has normalized after the changes done on 28 December 2011