InterSystem Neighboring Strategy_Initial Report.ppt

Customer Confidential

1 © Nokia Siemens Networks

INTERSYSTEM NEIGHBORING INTERSYSTEM NEIGHBORING STRATEGY STRATEGY

Customer Confidential2 © Nokia Siemens Networks

BACKGROUND

METHODOLOGY

The objective of the trial implementation► Minimize and improve neighbour list for ISHO and cell reselection

► Verify and fine tune ISHO and cell reselection parameters if applicable

► Investigate the need for different parameter settings in general situations

► Focusing only in Real Time (RT) Services

► Focusing only in Macro WCDMA (MW) in cluster accepted West Java area


SUMMARY• PLAN1:

• There is no adverse impact on 2G sites after trial of adjacency deletion from MW to MD and MW to OD.

• There is significant reduction on HO attempts from MW to MD collocated sites and OD. Although adjacent relation from MW to MD collocated inside the cluster has been deleted, a few number of HO attempts from MW to MD still exist due to attempt from active set outside the cluster.

• From 3G point of view, ISHO success rate remain stable.

• By reducing number of neighbor for 3G sites, there are more spaces available for the next adjacency creation for anticipating the upcoming network rollout.

• PLAN2:• For NonBorder Cluster, share of ISHO due to Ec/No was slightly increased

after HHoEcNoThreshold changing from -12dB to -10dB. Faster ISHO was triggered by Ec/No. ISHO success rate was slightly increased.

• For Border Cluster, share of ISHO due to RSCP was significantly increased since HHoRSCPThreshold changing from -102dBm to -96dBm. Faster ISHO was triggered by RSCP. ISHO success rate remain stable.


IMPLEMENTATION PLAN for PLAN1• Intersystem Neighboring strategy

• Review and delete neighbor relation from 3G to DCS in sites with having collocated GSM/DCS/3G but keep the relation from DCS to 3G (asymmetric relation). If DCS having GSM as collocated sites then relations 3G into DCS site can be deleted as 1 way neighbour.

• Delete all neighbor relations from 3G to all 2G Micro Outdoor to minimize and optimize number of adjacency in 3G layer with assumption that always there are Macro 2G coverage as umbrella of 2G Micro Outdoor coverage.

• Area Trial:

• Macrocell Djuanda Cluster

• Microcell Outdoor Asia Afrika Cluster


PLAN 1: LAYERING CONCEPTS 3G to 2G MACRO CELLS

Macro 3G

Macro GSM

Macro GSM

Macro 3G

Macro 3G

Macro GSM

Macro DCS

Macro DCS

Macro DCS

Background:

◙ Current 2G layering concept may leads to excessive number of adjacency in 3G . Also impact to inaccurate decision of ISHO decision during triggering of target cells

◙ GSM experienced with stronger signal than DCS

Layering Concept for 3G into 2G Macro Outdoor:

◙ Review and delete neighbor relation from 3G to DCS in sites with having collocated GSM/DCS/3G but keep the relation from DCS to 3G (asymmetric relation)

◙ If DCS having GSM as collocated sites then relations 3G into DCS site can be deleted as 1 way neighbour

DELETE

KEEP


Micro Outdoor

GSM

PLAN 1: LAYERING CONCEPTS 3G to 2G MICRO OUTDOOR

Macro 3G

Micro Outdoor

GSM

Macro 3G

Macro 3G

Micro Outdoor

DCS

Micro Outdoor

DCS

Layering Concept for 3G into 2G Micro Outdoor cells:

◙ Delete all neighbor relations from 3G to all 2G Micro Outdoor to minimize and optimize number of adjacency in 3G layer

◙ Always there are Macro 2G coverage as umbrella of 2G Micro Outdoor coverage

DELETE

KEEP


Number of ADJG Comparison

With this new layering strategy, there are more spaces available after adjacency deletion. This is valuable for the next adjacency creation inline with the growing network rollout.


Share of HO Attempts from MW to 2G Cells

Share of HO attempts from MW to MD was significantly reduced after neighbor relation deletion from MW to MD


Breakdown of HO Attempts from MW to 2G Cells

In the Cluster Macro DCS, there is one DCS standalone BTS (NARIPANMD) and another 5 DCS collocated sites. HO attempts from MW to DCS standalone site more likely the same before and after trial while HO attempts from MW to MD collocated site was significantly

reduced.


Share of HO Attempts from MW to 2G Cells

There was no more HO attempts from MW to OD after neighbor relation deletion from MW to OD


Outgoing HOSR for MG CELL

Outgoing HOSR for MG Cells in Cluster Plan1 Macro more likely the same before and after trial implementation


ISHO Success Rate

87.0

90.0

93.0

96.0

99.0

2007/1

1/1

5

2007/1

1/1

6

2007/1

1/1

7

2007/1

1/1

8

2007/1

1/1

9

2007/1

1/2

0

2007/1

1/2

1

2007/1

1/2

2

2007/1

1/2

3

2007/1

1/2

4

2007/1

1/2

5

2007/1

1/2

6

2007/1

1/2

7

Trial Macro DCS Trial Micro Outdoor DCS

Sum of ISHO_SR

Date

Area trial

ISHO Success Rate for 3G Cells in the cluster of trial remain stable.


KPI for 2G Cells in Cluster Plan1

Traffic, TCH blocking rate and TCH drop call rate for all cells inside the cluster of trial still remain stable. High blocking on 23 Nov was contributed by site GDGBUMIPUTRAID1,

HTLPERDANAMG1 and HTLPERDANAMG3.

Traffic Spike


KPI for MG Cells in Cluster Plan1

Traffic, TCH blocking rate and TCH drop call rate for all cells inside the cluster of trial still remain stable. High blocking on 23 Nov was contributed by site HTLPERDANAMG1 and

HTLPERDANAMG3.

Traffic Spike


PLAN 2 : ISHO triggered using Ec/No and RSCP for Dedicated Mode 3G-2G• ISHO triggered using EcNo and RSCP for Dedicated Mode 3G-2G

a. HO Decision of RSCP Threshold (HHoRSCPThreshold) and cancel (HHoRSCPCancel) parameter tuning

b. Ho Decision of Ec/No Threshold (HHoEcNoThreshold) and cancel (HHoEcNoCancel) parameter tuning

c. Area Trial: Border Area Ledeng & Parakan Saat ClusterNon Border Area Tegalega Cluster


PLAN-2. ISHO TRIGGERING DEDICATED MODE 3G-2G


ISHO Distribution by Causes

0%

20%

40%

60%

80%

100%

20

07

/11

/01

20

07

/11

/02

20

07

/11

/03

20

07

/11

/04

20

07

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/05

20

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/06

20

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/07

20

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/08

20

07

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/12

20

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20

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/14

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/15

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/27

20

07

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/28

Sum of IS_HHO_W_CMOD_UL_DCH_Q_RT Sum of IS_HHO_W_CMOD_UE_TX_PWR_RT

Sum of IS_HHO_W_CMOD_DL_DPCH_RT Sum of IS_HHO_W_CMOD_CPICH_RSCP_RT

Sum of IS_HHO_W_CMOD_CPICH_ECNO_RT Sum of IS_HHO_WO_CMOD_UL_DCH_Q_RT

Area NonBorder

DATE

Data

For NonBorder Cluster, share of ISHO due to Ec/No was slightly increased after HHoEcNoThreshold changing from -12dB to -10dB. Faster ISHO was triggered

by Ec/No.


ISHO Distribution by Causes

0%

10%

20%

30%

40%

50%

60%

70%

80%

90%

100%

200

7/1

1/0

1

200

7/1

1/0

2

200

7/1

1/0

3

200

7/1

1/0

4

200

7/1

1/0

5

200

7/1

1/0

6

200

7/1

1/0

7

200

7/1

1/0

8

200

7/1

1/1

2

200

7/1

1/1

3

200

7/1

1/1

4

200

7/1

1/1

5

200

7/1

1/1

6

200

7/1

1/1

7

200

7/1

1/1

8

200

7/1

1/1

9

200

7/1

1/2

0

200

7/1

1/2

1

200

7/1

1/2

2

200

7/1

1/2

3

200

7/1

1/2

4

200

7/1

1/2

5

200

7/1

1/2

6

200

7/1

1/2

7

200

7/1

1/2

8

Sum of IS_HHO_W_CMOD_UL_DCH_Q_RT Sum of IS_HHO_W_CMOD_UE_TX_PWR_RT

Sum of IS_HHO_W_CMOD_DL_DPCH_RT Sum of IS_HHO_W_CMOD_CPICH_RSCP_RT

Sum of IS_HHO_W_CMOD_CPICH_ECNO_RT Sum of IS_HHO_WO_CMOD_UL_DCH_Q_RT

Area Border

DATE

Data

For Border Cluster, share of ISHO due to RSCP was significantly increased since HHoRSCPThreshold changing from -102dBm to -96dBm. Faster ISHO was

triggered by RSCP.


ISHO Success Rate

94

.73

%

95

.01

%

95

.40

%

95

.58

%

95

.88

%

94

.90

%

94

.50

%

95

.30

%

95

.63

%

96

.71

%

96

.43

%

96

.29

%

95

.36

%

95

.10

%

95

.04

%

95

.70

%

96

.09

%

96

.56

%

96

.34

%

96

.57

%

96

.32

%

96

.36

%

96

.69

%

93

.39

%

80

.92

%

80.0%

85.0%

90.0%

95.0%

100.0%2

00

7/1

1/0

1

20

07

/11

/02

20

07

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/03

20

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/04

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ISH

O

0

2000

4000

6000

8000

10000

12000

14000

Nb

r o

f S

uc

ce

ss

RT

Sum of Success RT Average of ISHO RT

Area NonBorder

DATE

Data

ISHO success rate for NonBorder Cluster remain stable except for the last 2 days due to site problem on KOPOLKRSELMW while the number of ISHO success RT was

almost doubled. This problem still under investigation from MS team.


ISHO Success Rate

91.3

2%

93.3

6%

93.1

5%

93.3

3%

93.4

1%

92.9

0%

92.0

0%

91.9

3%

91.9

2%

93.9

2%

94.4

5%

95.0

9%

92.8

6%

92.4

2%

93.6

0%

93.6

3%

94.9

8%

92.5

8%

94.3

1%

93.8

5%

93.0

2%

92.1

9%

93.0

1%

93.9

3%

91.9

8%

80.0%

85.0%

90.0%

95.0%

100.0%2007/1

1/0

1

2007/1

1/0

2

2007/1

1/0

3

2007/1

1/0

4

2007/1

1/0

5

2007/1

1/0

6

2007/1

1/0

7

2007/1

1/0

8

2007/1

1/1

2

2007/1

1/1

3

2007/1

1/1

4

2007/1

1/1

5

2007/1

1/1

6

2007/1

1/1

7

2007/1

1/1

8

2007/1

1/1

9

2007/1

1/2

0

2007/1

1/2

1

2007/1

1/2

2

2007/1

1/2

3

2007/1

1/2

4

2007/1

1/2

5

2007/1

1/2

6

2007/1

1/2

7

2007/1

1/2

8

ISH

O

0

1000

2000

3000

4000

5000

6000

Nb

r o

f S

uccess R

T

Sum of Success RT Average of ISHO RT

Area Border

DATE

Data

ISHO success rate for Border Cluster remain stable while the number of ISHO success RT was almost doubled


DT Result


Plan 1 : Drive Test Statistic

No ISHO experienced in Micro Outdoor Cluster

*ISHO to GSM1800, UARFCN692_CALADIMD3. CALADIMD is located outside the cluster of testing


Plan 2 : Ledeng Border Area

• UE was served by SC159_LEDENGMW1 with Ec/No -10, RSCP -105. UE send MR-1F due to low RSCP.

• In the next 6s, ISHO was executed to ARFCN690_GSM1800

• UE was served by SC159_LEDENGMW1 with Ec/No -9, RSCP -101, UE send MR-1F due to RSCP.

• In the next 6s, ISHO was executed to ARFCN710_GSM1800

FASTER ISHO triggering by RSCP


Thank You

InterSystem Neighboring Strategy_Initial Report.ppt

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