3G NPI Report - Strategic Optimization & NPI Reccomendation

HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential

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3G NPI TELKOMSEL3G NPI TELKOMSEL CENTRAL JAVA CENTRAL JAVAStrategic Parameter OptimizationStrategic Parameter OptimizationNPI ReccomendationNPI Reccomendation


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CONTENTCONTENT

SStrategic Parameter Optimizationtrategic Parameter OptimizationCapacity OptimzationCapacity Optimzation2nd Carrier Parameter Optimization2nd Carrier Parameter OptimizationIRAT Parameter OptimizationIRAT Parameter OptimizationCPICH Adjustment TrialCPICH Adjustment TrialPower Control & SHO Parameter OptimizationPower Control & SHO Parameter Optimization

MAXFACH ParameterMAXFACH Parameter CELLRLPWR ParameterCELLRLPWR Parameter SHO ParameterSHO Parameter

NNPI ReccomendationPI ReccomendationCapacity ProposalCapacity ProposalWay Forward OptimizationWay Forward Optimization

ISHO Cluster Purwokerto & PekalonganISHO Cluster Purwokerto & Pekalongan CCSR HS RNC YogyakartaCCSR HS RNC Yogyakarta CSSR PS & HS RNC MargorejoCSSR PS & HS RNC Margorejo





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SStrategic Parameter trategic Parameter OptimizationOptimization

Capacity OptimizationCapacity Optimization





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HS USER UpgradeHS USER Upgrade1. Background1. Background

1. HS user license is one of the most important factors that influence CSSR PS & HS performance in 3G network due to HSDPA user license determine how many HS user can access the site simultaneously. (When the UE request HS RAB on site is higher than HS user license, HS RAB will be rejected and UE will setup PS R99 RAB as instead.)

2. Counter VS.HSDPA.UE.Mean.Cell can be used to monitor Active HS user per Cell. By comparing this counter with HS user license per node B we can get the figure whether HS user license is sufficient or need to be upgrade.





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HS USER UpgradeHS USER Upgrade2. Proposal HS License Upgrade2. Proposal HS License Upgrade





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HS USER UpgradeHS USER Upgrade3. Performance Monitoring3. Performance Monitoring

After HS user license upgrade, CSSR HS & PS performance at RNC Yogyakarta increased significantly





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FTI Proposal RNC MargorejoFTI Proposal RNC Margorejo1. Background1. Background

The KPI trend of CCSR PS & HS of RNC Margorejo decreased start from November 1st, 2010.

There was significant traffic growth of PS DL. At the same time there was increment number of RAB PS Fail due to TNL (VS.RAB.FailEstPS.TNL)

As Temporary Solution we proposed to adjust FTI parameter for IuPS RNC

Margorejo





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FTI Proposal RNC MargorejoFTI Proposal RNC Margorejo2. Paramer Setting & Result2. Paramer Setting & Result

Change activity factor from 100% to 60% for interactive RAB

CSSR PS & HS of RNC Margorejo back to normal after FTI parameter adjustment





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Second Carrier Parameter OptimizationSecond Carrier Parameter Optimization





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Second Carrier Parameter OptimizationSecond Carrier Parameter Optimization1. Background1. Background

There was high PS payload on F2 High R99 payload on F2 cause bad

quality on F2 High PS drop on F2 cause low CCSR PS Bad Ec/No during DT measurement Low throughput HS on F2 due to low

code assignment due to high PS on F2

PS Drop – RNC Yogyakarta





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Second Carrier Parameter OptimizationSecond Carrier Parameter Optimization2. Neighbor Audit2. Neighbor Audit

Second Carrier Neighbor Strategy:

Neighboring of F1 cells •Intrafrequency neighbors•GSM cells (existing neighbors)•Twin cell (parent only)

Neighboring of F2 cells•Intrafrequency F2 neighbors•Outgoing Inter-frequency F1 neighbours•GSM cells (existing neighbours)

Wrong relation





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Second Carrier Parameter OptimizationSecond Carrier Parameter Optimization3. Cell re-selection Strategy3. Cell re-selection Strategy

Push Idle Traffic on F1S criteria threshold for F2 need to be set higher than F1QRXLEVMIN(f2) > CPM (f2) > QRXLEVMIN (f1)QQUALMIN(f2) > CPM (f2) > QQUALMIN (f1)UE camp to F1not allowed to re-select to F2. HSDPA user and Multirab at F2,when going to idle will be push to F1F1 F2 : IDLEQOFFSET2SN = +50F2 F1 : IDLEQOFFSET2SN = -50 (Colo Cell)F2 F1 : IDLEQOFFSET2SN = 0 (Neighbor Cell)Cell re-selection on FACH must be deactivated on F2 to avoid fluent transition from HS(F2) FACH (F2) FACH (F1) HS (F2)

•Reserved F2 to reduce new establishment on F2 (some UE not support Qoffset)

Audit ResultAudit Result

New establishment still exist on F2 after Qoffset2sn, prospose to reserve F2





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Second Carrier Parameter OptimizationSecond Carrier Parameter Optimization3. Blind HO Audit Parameter3. Blind HO Audit Parameter

HS call at F1 will be redirected to F2 using Direct Retry Decision (DRD) algorithm parameters.

Parameter:BLINDHOFLAG F1 = ON, F2=OFF DRDECN0THRESHHOLD F1 F2 = -14, F2 F1 = -18

Audit ResultAudit Result





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Second Carrier Parameter OptimizationSecond Carrier Parameter Optimization4. 4. HS CM Activation HS CM Activation (cont’d)(cont’d)

• PS R99 payload on F2 decreased significantly

• CCSR PS was increased significantly due to reduction PS R99 traffic on F2

• Reduction PS R99 traffic on F2 leads to good EcNo and reducing the possibility PS drop due to bad radio quality on F2

• CCSR HS slightly decreased below the target KPI after HS CM activation at RNC Yogyakarta

• CCSR HS after compressed Mode activation still better than CCSR PS before compressed mode activation





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Second Carrier Parameter OptimizationSecond Carrier Parameter Optimization4. 4. HS CM ActivationHS CM Activation

Ec/No Before Ec/No After

EC/No F2 improve significantly after HS commpressed mode EC/No F2 improve significantly after HS commpressed mode activationactivationIt occurred due to less PS R99 on second carrierIt occurred due to less PS R99 on second carrier





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Second Carrier Parameter OptimizationSecond Carrier Parameter Optimization5. 5. INTERFREQ & INTERRAT Parameter TrialINTERFREQ & INTERRAT Parameter Trial

By consideration that F2 has same coverage with F1; HS mobility on F2 should have priority as below:1.HS Cell Change F2 F22.IFHO to F13.IRAT Cell change to GSM

in order to avoid HS drop due to compressed Mode we propose to reduce HS CM threshold in F2 to give priority on HSDPA cell change F2 F2 was executed first before HS CM was triggeredThe other reason is to avoid HS Drop due to Terminal Issue (not of all terminal can support HS CM)





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Second Carrier Parameter OptimizationSecond Carrier Parameter Optimization5. 5. INTERFREQ & INTERRAT Parameter TrialINTERFREQ & INTERRAT Parameter Trial Result Result

• Threshold 2d for IFHO and IRAT set to the lower value to reduce number of compressed mode

• Number of HS drop decrease after implementation parameter setting





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Second Carrier Parameter OptimizationSecond Carrier Parameter Optimization6. 6. INTERFREQ & INTERRAT Parameter TrialINTERFREQ & INTERRAT Parameter Trial Result Result

• CCSR HS shown positive trend after setting IRAT & Interfreq threshold to lower value

• It maybe caused by lower number UE experienced compressed Mode (Some UE not support HS compressed Mode)





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IRAT Parameter OptimizationIRAT Parameter Optimization





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IRAT Parameter OptimizationIRAT Parameter Optimization1. Background1. Background

IRAT ratio is around 35%

IRAT strategy objective : keep voice traffic as long as possible on 3G network and reduce IRAT ratioReducing IRAT will improve retain ability performance by reducing number of users / times in compressed mode (CPM)





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IRAT Parameter OptimizationIRAT Parameter Optimization2. Activity & Result2. Activity & Result

Change 2d CM RSCP from -97/-100 to -102Change 2d CM EcNo from -12 to -14

Trial ISHO Semarang & Margorejo





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CPICH Adjustment TrialCPICH Adjustment Trial





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CPICH Adjustment TrialCPICH Adjustment Trial1. Background1. Background

• High pilot pollution found in BB area Yogyakarta• Pilot pollution cause bad quality, low throughput and

leading to high drop call• Low throughput in some area due to bad quality





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CPICH Adjustment TrialCPICH Adjustment Trial2. Parameter Setting & Result2. Parameter Setting & Result

In order to reduce pilot pollution problem, 3G NPI propose to have CPICH adjustment Trial in BB Area RNC Yogyakarta by changing CPICH power at BB area to 310 (31 dBm). Performance monitoring shows that there was positive trend improvement.

Site List Propose Reduce CPICH





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CPICH Adjustment TrialCPICH Adjustment Trial2. Parameter Setting & Result2. Parameter Setting & Result





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Power Control & SHO Power Control & SHO Parameter OptimizationParameter Optimization MAXFACH Power Adjustment RL Supervision Parameter

Adjustment CELLRLPWR Parameter

Adjustment SHO Parameter Optimization





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MAXFACH Power OptimizationMAXFACH Power Optimization1. Background1. Background

At RRC Connection Setup Phase, there was possibility RRC fail due to The RRC CONNECTION SETUP message already sent by RNC but is not received by UE.

The RRC CONNECTION SETUP message is carried by FACH. After the UTRAN side receives the PRACH preamble, the UE sends the RRC CONNECTION REQUEST message on RACH based on current preamble power. Therefore, in poor coverage areas, unbalanced coverage by RACH and FACH is probable. Consequently the UTRAN side can receive the RRC CONNECTION REQUEST message while the UE fails to receive the RRC CONNECTION SETUP message.

Counter RRC.FailConnEstab.NoReply can be used to monitor this problem. The measurement is triggered when the RNC does not receive the RRC CONNECT SETUP COMPLETE messages upon sending of RRC CONNECT SETUP messages.





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MAXFACH Power OptimizationMAXFACH Power Optimization2. Parameter Setting2. Parameter Setting





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MAXFACH Power OptimizationMAXFACH Power Optimization3. Performance Monitoring3. Performance Monitoring

After changing MAXFACh Power, RRC Fail due to no Reply decreased significantly.

CSSR CS & PS Performance increased significantly





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CELLRLPWR Power OptimizationCELLRLPWR Power Optimization1. Background1. Background

RLMaxDLPwr and RLMinDLPwr respectively means the maximum and minimum transmitting power of downlink DPDCH symbol, represented by the relative value of CPICH. If RLMinDLPwr is set too low, it will cause that the transmitting power is very low due to wrong SIR estimation; if it is set too high, it will influence the downlink power control.

There was possibility that RAB drop due to low initial DPDCH power. We proposed to increase initial power DPDCH for several cells having problem high CS drop. The power utilization must be considered in this proposal because this will increase the power usage during soft handover.





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CELLRLPWR Power OptimizationCELLRLPWR Power Optimization2. Performance Monitoring2. Performance Monitoring

After CELLRLPWR adjustment, CCSR CS performance increased significantly





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SHO Parameter OptimizationSHO Parameter Optimization1. Background1. Background

One of the most important parameter related to Soft Handover is reporting range and time to trigger. The greater the reporting range is, the more easily a neighbor cell is listed into active set and the more difficult it is deleted from active set. This causes over high SHO rate.

A general method is to configure the threshold of 1A and 1B different. Configure the threshold of 1A event small (such as 3 dB) and keep the threshold of 1B threshold the same (5 dB). In this way, the cells with bad quality cannot be listed into active set easily and the cells with good quality can be listed into active set.

The reporting range can be set per CS Voice, CS Video and PS service.





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SHO Parameter OptimizationSHO Parameter Optimization2. Parameter Setting & Performance Monitoring2. Parameter Setting & Performance Monitoring





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NNPI ReccomendationPI Reccomendation Capacity ProposalCapacity Proposal





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Capacity ProposalCapacity Proposal

1. Power Upgrade Proposal1. Power Upgrade Proposal

2. Iub (ATM) Upgrade Proposal2. Iub (ATM) Upgrade Proposal

3. Iub (IP) Upgrade Proposal3. Iub (IP) Upgrade Proposal

4. CE UL Upgrade Proposal4. CE UL Upgrade Proposal

Proposal Power Upgrade

Proposal IuB (IP) Upgrade

Proposal IuB (ATM) Upgrade

Proposal CE UL Upgrade





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NNPI ReccomendationPI Reccomendation Way Forward of Performance Way Forward of Performance ImprovementImprovement





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ISHO Performance Cluster Purwokerto & ISHO Performance Cluster Purwokerto & Pekalongan (1)Pekalongan (1)

ISHO figure from statistic shows that there was a lot of Fail Relocation Other. This relocation failure wasn’t packed on relocation failure counter. We suspect that this failure coming from drop during relocation phase.

CHR figure shows that the most contributor of drop call is INTERRAT Handover





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ISHO Performance Cluster Purwokerto & ISHO Performance Cluster Purwokerto & Pekalongan (2)Pekalongan (2)

After comparion STATETIMER all RNC, RNC Purwokerto and Pekalongan have different value of Relocation Timer compared with other RNC that is 20000. So it is reccomended to increase relocation timer valur for RNC Purwokerto and Pekalongan from 20000 to 45000.

Most of INTERRAT Drop was caused by TimeOut

RELOCIURELCMDTMR: A timer to RNC wait for the Iu release command message in relocation procedure.





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ISHO Pekalongan & Purwokerto PerformanceISHO Signalling Procedure

Failure Possibility :- Drop during ISHO Relocation- Missing Database Configuration (LAC, CI)- Resource Availability in target cell

Failure Possibility :- Interference in Target Cell- HW Problem in Target Cell- Missing Database Configuration (BCCH, BSIC)





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CCSR HS Performance RNC Yogyakarta (1)CCSR HS Performance RNC Yogyakarta (1)

Proposed Mobility Scenario:

1. HS Cell Change F2 F22. IFHO to F13. IRAT Cell change to GSM

Proposed Parameter Setting:1.Lower setting of 2D threshold to reduce HS CM2.Setting 2D threshold Inter Freq < 2D threshold Inter RAT





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CCSR HS Performance RNC Yogyakarta (2)CCSR HS Performance RNC Yogyakarta (2)Parameter TrialParameter Trial





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CCSR HS Performance RNC Yogyakarta (3)CCSR HS Performance RNC Yogyakarta (3)Performance MonitoringPerformance Monitoring

CCSR HS Performance increased for several trial’s cells after setting INTERFREQ & INTERAT 2D into lower value





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CSSR PS & HS RNC MargorejoCSSR PS & HS RNC Margorejo

Change activity factor from 100% to 60% for interactive RAB CCSR PS & HS of RNC Margorejo back to normal after FTI Parameter adjustment. This condition indicates that there is lack of bandwidth for User Plane.

Proposed Increased BW for UP IuPS or Upgrade to IuPS over IP





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THANK YOU

3G NPI Report - Strategic Optimization & NPI Reccomendation

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