UMTS Traning - 3G Basic 2

107
October 2012 Arum Setyo [email protected]

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R13 Huawei

Transcript of UMTS Traning - 3G Basic 2

Page 1: UMTS Traning - 3G Basic 2

October 2012

Arum Setyo [email protected]

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3G Performance Analysis

3G RF Optimization

3G RF Optimization Cases

3G RF Formula

Capacity Management Concept

Expansion Criteria

Capacity counters & optimization

methodology

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Low CSSR CS

Low CSSR PS

High DCR CS

High DCR PS

Low CS ISHO Success Rate

Low PS ISHO Success Rate

Low IFHO Success Rate

Low HSDPA Throughput

Low HSUPA Throughput

Low coverage (low RSCP vs. propagation delay)

High interference (low EcNo (CQI) vs. good RSCP)

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Problem Classification Measurement Item Sub Items

Congestion RRC.FailConnEstab.Cong

VS.RRC.Rej.ULIUBBand.Cong,

VS.RRC.Rej.DLIUBBand.Cong

VS.RRC.Rej.ULPower.Cong,

VS.RRC.Rej.DLPower.Cong

VS.RRC.Rej.ULCE.Cong,

VS.RRC.Rej.DLCE.Cong

VS.RRC.Rej.Code.Cong

RF Problem

RRC.FailConnEstab.NoReply

VS.RRC.Rej.Redir.Dist

VS.RRC.Rej.Redir.InterRat

VS.RRC.Rej.Redir.IntraRat

VS.RRC.Rej.Redir.Service

Transmission Problem VS.RRC.Rej.RL.Fail

VS.RRC.Rej.TNL.Fail

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Transmission Problem: Relative alarms to identify faults on the transmission

path or the transmission boards of RNC/NodeB.

Congestion Problem: Check the Admission Control thresholds.

Take appropriate measures to relieve congestion, e.g. activate LDR (Load Reshuffling), OLC (Overload Control) algorithms, and to increase capacity.

RF Problem: Check coverage in the failure points.

Check if most failures occur in cell border (most probably they are).

Check FACH power.

Check DL interference in the cell: is there a pilot pollution issue?

Check UL interference in the cell.

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Problem Classification Measurement Item Sub Items Sub Items Sub Items

Level 1 Level 2 Level 3 Level 4

Congestion

VS.RAB.FailEstabCS.RNL VS.RAB.FailEstCS.

Unsp VS.RAB.FailEstabCS.

Cong

VS.RAB.FailEstCs.ULPower.Cong

VS.RAB.FailEstCs.DLPower.Cong

VS.RAB.FailEstCs.Code.Cong

VS.RAB.FailEstab.CS.DLIUBBand.

VS.RAB.FailEstab.CS.ULIUBBand.

VS.RAB.FailEstCs.ULCE.Cong

VS.RAB.FailEstCs.DLCE.Cong

RF Problem VS.RAB.FailEstabCS.UuFail

VS.RAB.FailEstabCS.IubFail

Transmission VS.RAB.FailEstabCS.TNL

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Transmission Problem: Check transmission issue on Iu-CS interface; check

relative alarms and its history.

RF Problem: Check invalid parameters Check inter-RAT HO and if the failure point is in RNC

border

Check the relative RB Setup failure counters to get more details on the failure cause

Congestion Problem: Check the Admission Control thresholds.

Take appropriate measures to relieve congestion, e.g. activate LDR, OLC algorithms, and to increase capacity.

Refer to 3G Capacity Optimization document

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Problem Classification Measurement Item Sub Items

Congestion RRC.FailConnEstab.Cong

VS.RRC.Rej.ULIUBBand.Cong,

VS.RRC.Rej.DLIUBBand.Cong

VS.RRC.Rej.ULPower.Cong,

VS.RRC.Rej.DLPower.Cong

VS.RRC.Rej.ULCE.Cong,

VS.RRC.Rej.DLCE.Cong

VS.RRC.Rej.Code.Cong

RF Problem

RRC.FailConnEstab.NoReply

VS.RRC.Rej.Redir.Dist

VS.RRC.Rej.Redir.InterRat

VS.RRC.Rej.Redir.IntraRat

VS.RRC.Rej.Redir.Service

Transmission Problem VS.RRC.Rej.RL.Fail

VS.RRC.Rej.TNL.Fail

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Transmission Problem: Relative alarms to identify faults on the transmission

path or the transmission boards of RNC/NodeB.

Congestion Problem: Check the Admission Control thresholds.

Take appropriate measures to relieve congestion, e.g. activate LDR (Load Reshuffling), OLC (Overload Control) algorithms, and to increase capacity.

RF Problem: Check coverage in the failure points.

Check if most failures occur in cell border (most probably they are).

Check FACH power.

Check DL interference in the cell: is there a pilot pollution issue?

Check UL interference in the cell.

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Problem Classification Measurement Item Sub Items Sub Items

Level 1 Level 2 Level 3

Congestion VS.RAB.FailEstPS.RNL VS.RAB.FailEstPS.Unsp VS.RAB.FailEstPs.ULPower.Cong

VS.RAB.FailEstPs.Code.Cong

VS.RAB.FailEstab.PS.DLIUBBand.Cong

VS.RAB.FailEstab.PS.ULIUBBand.Cong

VS.RAB.FailEstPs.ULCE.Cong

VS.RAB.FailEstPs.DLCE.Cong

VS.RAB.FailEstPs.DLPower.Cong

RF Problem VS.RAB.FailEstabPS.UuFail

VS.RAB.FailEstabPS.IubFail

Transmission VS.RAB.FailEstPS.TNL

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Transmission Problem:

Check relative alarms transmission issue on Iub

interface;

RF Problem:

Check coverage in the failure points. Check if

it is in cell border (most probably it is).

Congestion Problem:

Check the Admission Control thresholds. Take

appropriate measures to increase capacity.

Refer to this docs

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Problem

Classification Abnormal Release Indicator Sub-indicator (Level 2) Note

RF Problem VS.RAB.AbnormRel.CS.RF VS.RAB.AbnormRel.CS.RF.ULSync

VS.RAB.AbnormRel.CS.RF.UuNoReply

VS.RAB.AbnormRel.CS.RF.SRBReset

Non-RF Problem VS.RAB.AbnormRel.CS.OM CS RAB drops due to OM intervention, e.g. cell was blocked

VS.RAB.AbnormRel.CS.Preempt CS RAB drops due to preemption

VS.RAB.AbnormRel.CS.UTRANgen CS RAB drops due to UTRAN generated reasons; indicates hardware failure on RAN equipment; check alarms in order to identify the faulty part; repair or replace the faulty part once identified.

VS.RAB.AbnormRel.CS.OLC Released Due to congestion for Cell

VS.RAB.AbnormRel.CS.IuAAL2 CS RAB drops due to AAL2 failure; check transmission alarms to identify possible faults in the Iu-CS transmission path

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Check for missing neighbors

Check for pilot pollution (adjust physical config)

Check for UL interference. Check VS.MeanRTWP counter in order to see the value of UL interference in the cell. If the value is higher than -97 dBm, then interference exists in the UL. Check internal interference

Internal interference is usually caused by faulty connections in the antenna line. Check thoroughly all relative connection

Check external interference External interference is caused by external sources (e.g. TV/Radio

stations, military equipment, other network’s equipment, etc.).

External interference will appear randomly throughout the day. Its direction will be specific and it will affect more than one sites in the area.

Check neighbouring sites to see if they face the same problem.

In case of poor coverage, adjust physical config.

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Drops due to OM intervention, cell was

blocked

Drops due to preemption

Drops due to UTRAN generated reasons

Indicates hardware failure on RAN equipment

Check alarms in order to identify the faulty part

Repair or replace the faulty part once identified.

Drops due to congestion for Cell

Drops due to AAL2 failure

Check transmission alarms to identify possible

faults in the Iu-CS transmission path

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Problem

Classification Abnormal Release Indicator Sub-indicator (Level 2) Note

RF Problem VS.RAB.AbnormRel.PS.RF VS.RAB.AbnormRel.PS.RF.SRBReset

VS.RAB.AbnormRel.PS.RF.ULSync

VS.RAB.AbnormRel.PS.RF.UuNoReply

VS.RAB.AbnormRel.PS.RF.TRBReset PS RAB drops due to RLC reset

RF Problem VS.RAB.AbnormRel.PS.OM PS RAB drops due to OM intervention, e.g. cell was blocked

VS.RAB.AbnormRel.PS.Preempt PS RAB drops due to preemption

VS.RAB.AbnormRel.PS.OLC Released Due to congestion for Cell

VS.RAB.AbnormRel.PS.GTPULoss PS RAB drops due to GTPU failure; check transmission alarms to identify possible faults in the Iu-PS transmission path

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Check for missing neighbors

Check for pilot pollution (adjust physical config)

Check for UL interference. Check VS.MeanRTWP counter in order to see the value of UL interference in the cell. If the value is higher than -97 dBm, then interference exists in the UL. Check internal interference

Internal interference is usually caused by faulty connections in the antenna line. Check thoroughly all relative connection

Check external interference External interference is caused by external sources (e.g. TV/Radio

stations, military equipment, other network’s equipment, etc.).

External interference will appear randomly throughout the day. Its direction will be specific and it will affect more than one sites in the area.

Check neighbouring sites to see if they face the same problem.

In case of poor coverage, adjust physical config.

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Drops due to OM intervention, cell was

blocked

Drops due to preemption

Drops due to UTRAN generated reasons

Indicates hardware failure on RAN equipment

Check alarms in order to identify the faulty part

Repair or replace the faulty part once identified.

Drops due to congestion for Cell

Drops due to GTPU failure

Check transmission alarms to identify possible

faults in the Iu-PS transmission path.

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Problem Classification Failure Indicator Note

Preparation phase VS.IRATHO.FailRelocPrepOutCS.TAlExp.GCell TRELOCalloc expiry (the timer that waits for the “RELOCATION COMMAND” after the “REOCATION REQUIRED” expires; check if the RNC-MSC links are normal; check CN transmission parameters)

VS.IRATHO.FailRelocPrepOutCS.TgtFail.GCell Relocation Failure in target CN/RNC or target system (check the CN configuration; check if the BSS supports the relocation)

IRATHO.FailRelocPrepOutCS.ReloNoSup Relocation not supported in target RNC or target system

IRATHO.FailRelocPrepOutCS.NoResAvail No Resource Available (the BSC has no resources for the UE access or the 2G MSC has no information about the target cell)

IRATHO.FailRelocPrepOutCS.HigherTrafficLod Traffic load in the target cell higher than in the source cell

IRATHO.FailRelocPrepOutCS.UKnowRNC Unknown Target RNC (the LAI of the 2G target cell is not configured in the MSC)

Execution phase IRATHO.FailOutCS.CfgUnsupp Configuration Unsupported (the configuration assigned in the “HANDOVER FROM UTRAN COMMAND” is not supported by the UE; check configuration of the encryption parameters; might also be UE problem)

IRATHO.FailOutCS.PhyChFail Physical Channel Failure (indicates poor 2G signal – check the handover thresholds in both 3G and 2G configurations; check for interference in the 2G target cell)

VS.IRATHO.FailOutCS.NoReply Timeout of waiting for IU RELEASE COMMAND messages during an outgoing inter-RAT CS handover

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Check if the RNC-MSC links are normal

Check if there’s any relocation failure

Check if relocation not supported in target

RNC or target system

No Resource Available

BSC has no resources for the UE access

MSC has no information about the target cell

Need consistency checking between 2G and 3G

NDB

Congestion

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Check if there are any missing 2G neighbors

Check the inter-RAT handover parameters Improper settings may cause the handover not to be

performed on time: events 2D/2F parameters, events 3A, 3C parameters

Check the handover thresholds in both 3G and 2G configurations

Database 2G-3G Consistecy Check Cross check 2G CFGMML with External 2G on 3G

CFGMML (parameter check on 2G: MCC, MNC, LACCI, NCC, BCC, BCCH, RAC)

Old database still not yet erased

Check for Interference in the 2G target cell Check for SD and TCH blocking in the 2G target cell

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Problem Classification Failure Indicator Note

Preparation phase VS.IRATHO.FailRelocPrepOutPS.NoResAvail No Resource Available (the BSC has no resources for the UE access or the 2G MSC has no information about the target cell)

VS.IRATHO.FailRelocPrepOutPS.ReloUnSupp Relocation not supported in target RNC or target system

VS.IRATHO.FailRelocPrepOutPS.TAlExp TRELOCalloc expiry (the timer that waits for the “RELOCATION COMMAND” after the “REOCATION REQUIRED” expires; check if the RNC-MSC links are normal; check CN transmission parameters)

VS.IRATHO.FailRelocPrepOutPS.TgtFail Relocation Failure in target CN/RNC or target system (check the CN configuration; check if the BSS supports the relocation)

VS.IRATHO.FailRelocPrepOutPS.TgtHighLoad Traffic load in the target cell higher than in the source cell

VS.IRATHO.FailRelocPrepOutPS.UnKnowRNC Unknown Target RNC (the LAI of the 2G target cell is not configured in the MSC)

Execution phase IRATHO.FailOutPSUTRAN.CfgUnsupp(none) Configuration Unsupported (the configuration assigned in the “HANDOVER FROM UTRAN COMMAND” is not supported by the UE; check configuration of the encryption parameters; might also be UE problem)

IRATHO.FailOutPSUTRAN.PhyChFail(none) Physical Channel Failure (indicates poor 2G signal – check the handover thresholds in both 3G and 2G configurations; check for interference in the 2G target cell)

VS.IRATHO.FailOutPSUTRAN.NoReply Timeout of waiting for IU RELEASE COMMAND messages during an outgoing inter-RAT CS handover

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Check if the RNC-SGSN links are normal

Check if there’s any relocation failure

Check if relocation not supported in target

RNC or target system

No Resource Available

BSC has no resources for the UE access

MSC has no information about the target cell

Need consistency checking between 2G and 3G

NDB

Congestion

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Check if there are any missing 2G neighbors

Check the inter-RAT handover parameters Improper settings may cause the handover not to be

performed on time: events 2D/2F parameters, events 3A, 3C parameters

Check the handover thresholds in both 3G and 2G configurations

Database 2G-3G Consistecy Check Cross check 2G CFGMML with External 2G on 3G

CFGMML (parameter check on 2G: MCC, MNC, LACCI, NCC, BCC, BCCH, RAC)

Old database still not yet erased

Check for Interference in the 2G target cell Check for PDCH blocking in the 2G target cell

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Failure Indicator Note

VS.HHO.FailInterFreqOut.CfgUnsupp Configuration unsupported (the UE doesn’t support the configuration assigned by the RNC in the “PHYSICAL CHANNEL RENONFIGURATION” message – indicates possible UE problem – however this case almost never happens in commercial networks)

VS.HHO.FailInterFreqOut.PyhChFail Physical channel failure (indicates poor coverage)

VS.HHO.FailInterFreqOut.ISR Incompatible simultaneous reconfiguration (the UE feedbacks that the HHO procedure is not compatible with other concurrent processes. This case almost never happens; it indicates defective UE)

VS.HHO.FailInterFreqOut.CellUpdt Cell update occurred (this case never happens in commercial network)

VS.HHO.FailInterFreqOut.InvCfg Invalid configuration (some IEs in the “PHYSICAL CHANNEL RENONFIGURATION” message are invalid for the UE; this case almost never happens; indicates possible UE problem)

VS.HHO.FailInterFreqOut.NoReply No response on the air interface (indicates poor coverage or even a UE problem)

VS.HHO.FailInterFreqOut.PrepFail

VS.HHO.FailInterFreqOut.RLSetupFail

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Optimizing Neighbor based on scenario given

Blind HO setting

Check availability/alarm on surroundings

Check if there are any missing neighbors

Check the inter-frequency handover

parameters

Improper settings may cause the handover not to

be performed on time

Check events 2D/2F parameters

Check events 2B, 2C parameters

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RNC level formula:

HSDPA Throughput Kbps (RNC) =

[VS.HSDPAPSLoad.DLThruput.RNC]

Cell level formula:

HSDPA Throughput Kbps (Cell) =

[VS.HSDPA.MeanChThroughput]

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Check radio environment in the problematic cell Poor coverage is directly related with low HSDPA throughput.

Enhance coverage by appropriate tuning of antenna parameters (tilt, azimuth).

Check for pilot pollution In case pilot pollution exists in the area, try to adjust tilts and/or

azimuths of relative sites

Check for ping-pong serving cell change based on 1D event: ping-pong limits throughput If this is the problem, tune event 1D parameters in order to eliminate

ping-pong.

Consider also the value of the HspaTimerLen parameter.

Check for hardware/software alarm in the site

Check transmission whole network thoroughly Possibility of bottleneck in the transmission chain (e.g. too many sites

are served by a single low capacity router).

Check Iu-PS interface. Check for faults (relative alarms) and its capacity. Make sure that the

configured Iu-PS capacity is not a bottleneck for PS service demands.

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RNC level formula:

HSUPA Throughput Kbps (RNC) =

[VS.HSUPAPSLoad.ULThruput.RNC]

Cell level formula:

HSUPA Throughput Kbps (Cell) =

[VS.HSUPA.MeanChThroughput]

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Check radio environment in the problematic cell poor coverage is directly related with low HSUPA throughput.

Enhance coverage by appropriate tuning of physical config

Check for UL interference in the problematic area VS.MeanRTWP will provide average RTWP of cell (UL

interference give limits to HSUPA throughput)

Check for ping-pong serving cell change based on 1D event If this is the problem, tune event 1D parameters in order to

eliminate ping-pong.

Consider also the value of the HspaTimerLen parameter.

Check for hardware/software alarm

Check transmission whole network thoroughlyPossibility of bottleneck in the transmission chain (e.g. too many sites are served by a single low capacity router).

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Check the NodeB hardware equipment.

Check the alarms.

Conduct DT in the area of poor coverage to confirm the problem.

Measure RSCP and Propagation delay.

If RSCP is low while Propagation delay is low as well, this indicates poor coverage close to the base station.

Survey the environment

Check for shadowing effect caused by object obstacles in the area.

This might cause low signal strength close to NodeB.

Analyse the multipath environment in the area (in dense urban strong multipath may cause deep signal fades (fast fading))

Adjust physical config (tilt, azimuth) appropriately in order to optimise the coverage in the problematic area.

Check the CPICH power setting.

Default value is 33 dBm.

Consider increase/decrease if needed

Increase the power amplifier output

usually initial 3G output is 20W. Consider upgrading to 40W or even to 60W.

This will give extra margin to increase CPICH power and RL power.

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Check for pilot pollution in the area

In case pilot pollution exists in the area

Adjust tilts and/or azimuths of relative sector

Check for missing neighbours

Missing neighbours can cause increase of

interference in the source cell.

Check whether the interference is from an

external source

Check for nearby sources of E/M radiation:

TV/Radio stations, Military, Civil aviation, etc.

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Log file & Necessary picture from field (by DT)

Plot PSC from scanner for pilot pollution analyze

Plot idle mode, short call, and long call for analyzing network first symptoms before optim

Alarm list on the specific date

Latest network data base (contains: TSSR, physical configuration of the network, neighbor)

Contour Map

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Index Reference Remarks

Coverage rate ≥ 95%

Test on the acceptance route

The planned continuous coverage

service:

CPICH Ec/Io ≥ –12 dB

CPICH RSCP ≥ –95 dBm

CPICH Ec/Io ≥ –12dB ≥ 95% Test result by scanner in outdoor

unloaded conditions

CPICH RSCP ≥ –95dBm ≥ 95% Test result by scanner in outdoor

unloaded conditions

SHO Factor based on DT 30%–40%

The SHO Factor based on DT

should be 5% to 10% lower than

the goal, because the following

optimizations cause the soft

handover factor to increase

Pilot pollution ratio ≤ 5% –

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15–25 NodeBs in a cluster is recommended

A cluster must cover different areas based on density of user traffic/clutter

A cluster can define based on landform factor Mountains block signal propagation, so they are natural borders for

dividing clusters.

Rivers causes a longer propagation distance, so they affect dividing clusters in various aspects. If a river is narrow, the signals along two banks will interact. If the

transportation between two banks allows, divide sites along the two banks in the same cluster.

If a river is wide, the upstream and downstream will interact. In this situation, the transportation between two banks is inconvenient, dividing clusters by the bank according to actual situation.

A cluster can define based on network project maintenance

A cluster can define based on Administrative areas

A cluster can define based on DT workload The DT must be performed within a day for a cluster

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Confirm the KPI DT acceptance route with the operator before DT. If the operator already has a decided DT acceptance route, you

must consider this upon deciding the KPI DT acceptance route.

If the objective factors like network layout cannot fully meet the coverage requirements of decided test route by the operator, you must point this out.

The KPI DT acceptance route must cover major streets, important location, VIP, and VIC (Very Important Cell). The DT route should cover all cells as possible.

Round-trip DT is performed if possible.

Consider actual factors like lanes and left-turn restriction while deciding test route.

Before negotiating with the operator, communicate these factors with local drivers for whether the route is acceptable.

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Weak coverage

Cross-cell coverage

Unbalance uplink and downlink

No primary pilot cell

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Weak coverage define with RSCP smaller than

–95 dBm. It might be in:

Valley areas

Hillside back

Elevator well

Tunnel

Underground garage

Basement

Areas inside high buildings

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Physical configuration changes: Increase pilot transmit power,

Adjust antenna down tilt and azimuth,

Increase antenna height,

Use antennas with higher gain to optimize coverage.

Hole coverage: Construct new NodeBs or expand the coverage range of

neighbor NodeBs.

Pay attention to that increasing of coverage areas might cause intra-frequency and inter-frequency interference.

Add RRU in valley and hillside back areas with weak coverage to expand coverage range.

Dead Zone Area: Use RRU,

Indoor distributed system,

Leakage cable,

Directional antenna

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Cross-cell coverage means the signal from

one NodeB hits the other signal from the

other nodeB.

Drops happen due to delayed handover often

occurred because of this problem.

Interference might occurs as well.

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Reduce cross-cell coverage areas by using

sheltering effect of adjacent buildings.

Meanwhile you must avoid intra-frequency

interference to other NodeBs.

For over high NodeBs, change the site.

Too large mechanism down tilt causes aberration

of antenna direction maps.

Eliminate the "island" effect and reduce NodeB

coverage areas by adjusting pilot transmit power

and using electric down tilt.

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Unbalanced uplink and downlink refers to the following situations:

The downlink coverage is good but the uplink coverage is restricted.

More specific: the UE transmit power reaches the maximum which still cannot meet uplink BLER requirements.

The downlink coverage is restricted.

More specific, the downlink DCH transmit power reaches the maximum which still cannot meet downlink BLER requirements.

If the uplink and downlink are unbalanced, call drops easily. The probable cause is restricted uplink coverage.

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Check for interference by monitoring RTWP

alarms of NodeB

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Brief:

In no primary pilot areas, UE hands over

frequently, so the system efficiency is lowered

and probability of call drop increases.

Solution:

Adjusting antenna down tilt and azimuth.

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RSCP Threshold -95dBm; Ec/No Threshold -12dB

Pilot Pollutions Poor Coverage

Poor Coverage Optimum Area

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There are 2 type of capacity:

Downgrade/Degrowth

Upgrade/Growth

This type decided by 3 factors:

Blocking

Utilization

3G Resources related to blocking and

utilization:

CE, IuB, Power, and Code

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Basic Formula

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UPGRADE

Blocking High

Utilization High

DOWNGRADE

Blocking Low

Utilization Low

Resource Configured more than 2

Cek Parameter Setting if:

Blocking High

Utilization Low

Cek Alarm and license:

Blocking Low

Utilization High

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Resource Verification Action

Iub No improper

coverage/

Configuration

issue

Iub Expansion/ Modernization and Expansion

CE CE Board/License Expansion

Power 40W/New Site/2nd Carrier

HSDPA Code License Expansion

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Iub Expansion Notice

Criteria of 1 AND 2 OR 3 triggered for 2

consecutive weeks

Criteria must be fulfilled at least 3 days a week

Coverage exercise must be done before proposing

action

Index Triggering Criteria (Busy Hour)

1 Iub Utilization (Max of average in BH 5 conservative days) > 70%

2 RAB Blocking Rate due to Iub > 1%

3 HSDPA UE Mean Utilizations per NodeB > 70%

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CE Expansion Notice

Both criteria of 1 AND 2 triggered for 2

consecutive weeks

Criteria must be fulfilled at least 3 days a week

Coverage exercise must be done before proposing

action

Index Triggering Criteria (Busy Hour)

1 CE Utilization (Max of average in BH 5 conservative days) > 70%

2 RRC + RAB Blocking Rate due to CE > 1%

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Power Expansion Notice

Criteria 1 AND 2 triggered for 2 consecutive

weeks

Criteria must be fulfilled at least 3 days a week

Coverage exercise must be done before proposing

action

Index Triggering Criteria (Busy Hour)

1 Power Utilization (Max of average in BH 5 conservative days) > 70%

2 RAB Blocking Rate due to Power > 1%

Page 88: UMTS Traning - 3G Basic 2

HSDPA Code Expansion Notice

Criteria triggered for 2 consecutive weeks

Criteria must be fulfilled at least 3 days a week

Coverage exercise must be done before proposing

action

Index Triggering Criteria (Busy Hour)

1 HSDPA Code Utilization (Max of BH 5 conservative days) > 80%

Page 89: UMTS Traning - 3G Basic 2
Page 90: UMTS Traning - 3G Basic 2

BLOCKING:

VS.RRC.Rej.UL.CE.Cong: Number of RRC Connection Reject.

VS.RAC.NewCallRequest.Fail.ULCE.Cong: Number of failures in the RRC/RAB SETUP procedure.

VS.RAB.FailEstCs.ULCE.Cong: Number of CS RABs unsuccessfully established.

VS.RAB.FailEstPs.ULCE.Cong: Number of PS RABs unsuccessfully established.

VS.RAC.SHO.Fail.ULCE.Cong: Number of failures in the SHO procedure.

VS.RAC.HHO.Fail.ULCE.Cong: Number of failures in the HHO procedure.

VS.RAC.TrChSwitch.Fail.ULCE.Cong: Number of failures in the Channel Switch procedure.

VS.RAC.DCCC.Fail.ULCE.Cong: Number of failures in the DCCC procedure.

VS.LCC.LDR.Num.ULCE: Number of times a cell is in LDR (Load Reshuffling) State due to UL CE Resource Congestion.

VS.LCC.LDR.Time.ULCE: Duration in seconds of LDR State due to UL CE Resource Congestion.

UTILIZATION:

VS.LC.ULCreditUsed.CELL.Max: Maximum UL credit usage.

UL CE Utilization Ratio(NodeB) = (VS.LC.ULMax.LicenseGroup.Shared / VS.LC.ULCreditAvailable.Shared)*100%.

VS.LC.ULMax.LicenseGroup.Shared: Max usage of UL CEs.

VS.LC.ULCreditAvailable.Shared: Number of UL CEs licensed.

Page 91: UMTS Traning - 3G Basic 2

If the congestion is spread among different hours and days, and on the same NodeB, the following parameters can be used to decrease the usage of UL CEs: UlMidRateThd (DCCC): Uplink Mid Bit Rate Threshold.

UlDcccRateThd (DCCC): Uplink Bit Rate Threshold for DCCC.

UlFullCvrRate (DCCC): Uplink Full Coverage Bit Rate.

UlGBR (USERGBR): Uplink GBR for BE service.

UlRateDnAdjLevel (DCCC): Uplink Rate Decrease Adjust Level. If set to 3_Rates can be reduced to 2_Rates.

UlRateUpAdjLevel (DCCC): Uplink Rate Increase Adjust Level. If set to 2_Rates can be increased to 3_Rates.

Additional options are: Decrease the Max Bit Rate

Add more UL CEs

Direction Spreading

Factor

Number of

CEs Consumed

Corresponding

Credits

Consumed

Typical Traffic

Class

UL 256 1 2 3.4 kbit/s SRB

UL 64 1 2 13.6 kbit/s SRB

UL 64 1 2 12.2 kbit/s AMR

UL 16 3 6 64 kbit/s VP

UL 32 1.5 3 32 kbps PS

UL 16 3 6 64 kbit/s PS

UL 8 5 10 128 kbit/s PSUL 4 10 20 384 kbit/s PS

Page 92: UMTS Traning - 3G Basic 2

BLOCKING:

VS.RRC.Rej.DL.CE.Cong: Number of RRC Connection Reject.

VS.RAC.NewCallRequest.Fail.DLCE.Cong: Number of failures in the RRC/RAB SETUP procedure.

VS.RAB.FailEstCs.DLCE.Cong: Number of CS RABs unsuccessfully established.

VS.RAB.FailEstPs.DLCE.Cong: Number of PS RABs unsuccessfully established.

VS.RAC.SHO.Fail.DLCE.Cong: Number of failures in the SHO procedure.

VS.RAC.HHO.Fail.DLCE.Cong: Number of failures in the HHO procedure.

VS.RAC.TrChSwitch.Fail.DLCE.Cong: Number of failures in the Channel Switch procedure.

VS.RAC.DCCC.Fail.DLCE.Cong: Number of failures in the DCCC procedure.

VS.LCC.LDR.Num.DLCE: Number of times a cell is in LDR State due to DL CE Resource Congestion.

VS.LCC.LDR.Time.DLCE: Duration in seconds of LDR State due to DL CE Resource Congestion.

UTILIZATION:

VS.LC.DLCreditUsed.CELL.Max: Maximum DL credit usage.

DL CE Utilization Ratio(NodeB) = (VS.LC.DLMax.LicenseGroup.Shared / VS.LC.DLCreditAvailable.Shared)*100%.

VS.LC.DLMax.LicenseGroup.Shared: Max usage of DL CEs.

VS.LC.DLCreditAvailable.Shared: Number of DL CEs licensed.

Page 93: UMTS Traning - 3G Basic 2

If congestion is spread among different hours and days, and on the same NodeB, the following parameters can be used to decrease the usage of DL CEs: DlMidRateThd (DCCC): Downlink Mid Bit Rate Threshold.

DlDcccRateThd (DCCC): Downlink Bit Rate Threshold for DCCC.

DlFullCvrRate (DCCC): Downlink Full Coverage Bit Rate.

DlGBR (USERGBR): Downlink GBR for BE service.

DlRateDnAdjLevel (DCCC): Downlink Rate Decrease Adjust Level. If set to 3_Rates can be reduced to 2_Rates.

DlRateUpAdjLevel (DCCC): Downlink Rate Increase Adjust Level. If set to 2_Rates can be increased to 3_Rates.

Additional options are: Decrease the Max Bit Rate

Add more DL CEs

Direction Spreading

Factor

Number of

CEs Consumed

Corresponding

Credits

Consumed

Typical Traffic

Class

DL 256 1 1 3.4 kbit/s SRB

DL 128 1 1 13.6 kbit/s SRB

DL 128 1 1 12.2 kbit/s AMR

DL 32 2 2 64 kbit/s VP

DL 64 1 1 32 kbps PS

DL 32 2 2 64 kbit/s PS

DL 16 4 4 128 kbit/s PSDL 8 8 8 384 kbit/s PS

Page 94: UMTS Traning - 3G Basic 2

BLOCKING:

VS.RRC.Rej.Code.Cong: Number of RRC Connection Reject.

VS.RAB.FailEstCs.Code.Cong: Number of CS RABs unsuccessfully established.

VS.RAB.FailEstPs.Code.Cong: Number of PS RABs unsuccessfully established.

VS.RAC.SHO.Fail.OVSF.Cong: Number of failures in the SHO procedure.

VS.RAC.TrChSwitch.Fail.OVSF.Cong: Number of failures in the Channel Switch procedure.

VS.RAC.DCCC.Fail.OVSF.Cong: Number of failures in the DCCC procedure.

VS.LCC.LDR.Num.DLCode: Number of times a cell is in LDR State due to Code Resource Congestion.

VS.LCC.LDR.Time.DLCode: Duration in seconds of LDR State due to Code Resource Congestion.

VS.LCC.LDR.CodeAdj: Number of UEs for Code Adjustment in Basic Congestion

UTILIZATION:

Code Utilization Ratio(Cell) = (VS.RAB.SFOccupy.MAX / 256)*100%.

VS.RAB.SFOccupy.MAX: Maximum number of SFs codes in a cell. Code are occupied by the common channels, R99 users and HS-DSCH. The code number is normalized to SF = 256, that is, converted to the code number when SF = 256.

Soft Handover Overhead(Cell) = [(VS.SHO.AS.1RL+VS.SHO.AS.2RL+VS.SHO.AS.3RL+VS.SHO.AS.4RL+VS.SHO.AS.5RL+VS.SHO.AS.6RL)/(VS.SHO.AS.1RL+VS.SHO.AS.2RL/2+VS.SHO.AS.3RL/3+VS.SHO.AS.4RL/4+VS.SHO.AS.5RL/5+VS.SHO.AS.6RL/6)-1]*100%.

VS.SHO.AS.xRL: Mean Number of UEs with x RL. Code resources could be wasted because of too many cells in SHO. Optimal value is Soft Handover Overhead = 1.3 ~ 1.4, but it depends also on the area (urban/rural).

NodeB Performance Counters: VS.PdschCodeUsed.Max: Maximum number of codes used by HS-PDSCHs in a cell during a measurement period.

VS.PdschCodeAvail.Max: Maximum number of codes available for HS-PDSCHs in a cell during a measurement period.

Page 95: UMTS Traning - 3G Basic 2

In case of CAC based on code resources, the only parameter controlling triggering is:

DlHoCeCodeResvSf (CELLCAC): DL Handover Credit and Code Reserved SF.

[Quantity of DL code (SF) and CE resources reserved for handover UEs]

Rule: DlHoCeCodeResvSf ≥ max(DLLDRCREDITSFRESTHD, CELLLDRSFRESTHD).

In case of LDR based on code resources, triggering can be controlled through:

CELLLDRSFRESTHD (CELLLDR): Cell LDR SF reserved threshold.

[Code reshuffling could be triggered only when the minimum available SF of a cell is higher than this threshold]

ULLDRCREDITSFRESTHD, DLLDRCREDITSFRESTHD(CELLLDR): UL/DL LDR Credit SF reserved threshold.

[UL/DL credit LDR could be triggered only when the SF factor corresponding to the UL/DL reserved credit is higher than the UL or DL credit SF reserved threshold. Low value means Higher admission success rate but easier congestion status and then Easier LDR action trigger]

Many LDR actions can be performed. Particularly for Code Basic Congestion, Code Reshuffling is controlled through:

MAXUSERNUMCODEADJ (CELLLDR): Max user number of code adjust.

[Number of users selected in code reshuffling]

LdrCodePriUseInd (CELLLDR): LDR code priority indicator.

[If TRUE, the codes with high priority are reserved during code reshuffling]

Other relevant LDR actions to control code shortage are Inter-Frequency Load Handover and BE Rate Reduction.

Page 96: UMTS Traning - 3G Basic 2

BLOCKING:

VS.RRC.Rej.Power.Cong: Number of RRC Connection Reject.

VS.RAB.FailEstCs.Power.Cong: Number of CS RABs unsuccessfully established.

VS.RAB.FailEstPs.Power.Cong: Number of PS RABs unsuccessfully established.

VS.RAC.Total.Power.Cong: Number of admission failures due to Total Power resource insufficiency.

VS.RAC.R99.Power.Cong: Number of admission failures due to R99 Power resource insufficiency.

VS.RAC.HSDPA.Power.Cong: Number of admission failures due to HSDPA Power resource insufficiency.

VS.RAC.HSUPA.Power.Cong: Number of admission failures due to HSUPA Power resource insufficiency.

VS.RAC.SHO.Fail.ULLD.Cong, VS.RAC.SHO.Fail.DLLD.Cong: Number of failures in the SHO procedure.

VS.RAC.HHO.Fail.ULLD.Cong, VS.RAC.HHO.Fail.DLLD.Cong: Number of failures in the HHO procedure.

VS.RAC.TrChSwitch.Fail.ULLD.Cong, VS.RAC.TrChSwitch.Fail.DLLD.Cong: Number of failures in the Channel Switch procedure.

VS.RAC.DCCC.Fail.ULLD.Cong, VS.RAC.DCCC.Fail.DLLD.Cong: Number of failures in the DCCC procedure.

VS.LCC.LDR.Num.ULPower, VS.LCC.LDR.Num.DLPower: Number of times a cell is in LDR State due to Power (Equivalent Number of Users) Congestion.

VS.LCC.LDR.Time.ULPower, VS.LCC.LDR.Time.DLPower: Duration in seconds of LDR State due to Power (Equivalent Number of Users) Congestion..

UTILIZATION:

VS.MeanTCP: Mean Transmitted Carrier Power (dBm).

VS.MaxTCP: Max Transmitted Carrier Power (dBm).

UL Interference Cell Ratio(RNC) = [(Number of Cells where VS.MeanRTWP>-98dBm)/Total Number Of Cells In RNC]*100%.

VS.MeanRTWP: Mean Received Total Wideband Power (dBm).

Page 97: UMTS Traning - 3G Basic 2

In case of CAC based on power resources, the controlling parameters depend on the Algo used.

For Algo1&3: UlNonCtrlThdForAMR, DLCONVAMRTHD (CELLCAC): UL/DL threshold of Conv AMR.

UlNonCtrlThdForNonAMR, DLCONVNAMRTHD (CELLCAC): UL/DL threshold of Conv non_AMR.

UlNonCtrlThdForOther, DLOTHERTHD (CELLCAC): UL/DL threshold of other service.

UlNonCtrlThdForHo, DLHOTHD (CELLCAC): UL/DL Handover access threshold.

[These thresholds are a percentage of the 100% downlink load. If the UL/DL load of a cell is higher than these thresholds after the access of a service, this service will be rejected]

Rules: DLHOTHD > max(DLCONVAMRTHD, DLCONVNAMRTHD) > DLOTHERTHD

UlNonCtrlThdForHo > max(UlNonCtrlThdForAMR, UlNonCtrlThdForNonAMR) > UlNonCtrlThdForOther

For Algo2: ULTOTALEQUSERNUM, DLTOTALEQUSERNUM (CELLCAC): UL/DL total equivalent user number.

[Total equivalent user number corresponding to the 100% uplink load]

RRC connection request is rejected upon UL or DL admission decision by RRM. Check VS.MeanRTWP and VS.MaxTCP of the cell to determine whether the rejection is due to UL or DL congestion.

Page 98: UMTS Traning - 3G Basic 2

In case of LDR based on power resources, triggering can be controlled through:

ULLDRTRIGTHD, DLLDRTRIGTHD (CELLLDM): UL/DL LDR trigger threshold.

[If (UL Load / UL Capacity) of the cell is not lower than this threshold, UL load reshuffling is triggered]

ULLDRRELTHD, DLLDRRELTHD (CELLLDM): UL/DL LDR release threshold.

[If (UL Load / UL Capacity) of the cell is lower than this threshold, UL load reshuffling is stopped]

Many LDR actions can be performed. Particularly for Power Basic Congestion, MBMS (Multimedia Broadcast Multicast Service) Power Reduction is controlled through:

MBMSDECPOWERRABTHD (CELLLDR): MBMS descend power RAB threshold.

[MBMS provides unidirectional point-to-multipoint multimedia services. When the priority of the RAB of MBMS services exceeds this threshold, reconfigure the MBMS power to the minimum power]

Other relevant LDR actions to control power shortage are Inter-Frequency Load Handover, BE Rate Reduction and Inter-RAT Handover in the CS Domain.

Page 99: UMTS Traning - 3G Basic 2

BLOCKING:

VS.RAC.NewCallRequest.Fail.HSDPANum.Cong: Number of failures in the RRC or RAB SETUP procedure.

VS.RAB.RelReqPS.BE.HSDPA.Cong.Golden, VS.RAB.RelReqPS.BE.HSDPA.Cong.Silver, VS.RAB.RelReqPS.BE.HSDPA.Cong.Copper: Number of released PS BE RABs beared on HSDPA.

VS.RAC.HHO.Fail.HSDPANum.Cong: Number of failures in the HHO procedure.

VS.RAC.TrChSwitch.Fail.HSDPANum.Cong: Number of failures in the Channel Switch procedure.

VS.HSDPA.LDR.InterFreq: Number of HSDPA UEs that perform inter-frequency handover because of Basic Congestion.

VS.HSDPA.LDR.InterRATPS: Number of HSDPA UEs that perform PS inter-RAT handover because of Basic Congestion.

VS.HSDPA.OLC.UserRel: Number of UEs released due to Overload Congestion.

UTILIZATION:

VS.HSDPA.UE.Mean.Cell: Number of UEs in CELL_HSDPA state in a cell.

In case of CAC based on the number of HSDPA users, the controlling parameter is:

MaxHsdpaUserNum (CELLCAC): Maximum HSDPA user number (based on cell type and available HSDPA power and code resources). Its value is related to the presence of the following features:

WRFD-01061016: 16 HSDPA Users per Cell.

WRFD-010622: 32 HSDPA Users per Cell.

WRFD-010623: 64 HSDPA Users per Cell.

HSDPA Utilization Ratio(Cell) = [maxHours(VS.HSDPA.UE.Mean.Cell) / MaxHsdpaUserNum]*100%.

Page 100: UMTS Traning - 3G Basic 2

If Basic Congestion is triggered, make sure that VS.HSDPA.LDR.InterFreq is incremented, but not VS.HSDPA.LDR.InterRATPS (typically the PS inter-rat handover algorithm switch is disabled, and HSDPA calls are preferred dropping rather than handing over to 2G).

Basic Congestion is a ‘normal’ situation and the ideal LDR action for HSDPA users is inter-frequency handover to balance the load. Overload Congestion instead requires the release of HSDPA users. Overload Congestion is triggered by:

ULOLCTRIGTHD, DLOLCTRIGTHD (CELLLDM): UL/DL OLC trigger threshold.

[If (UL Load / UL Capacity) of the cell is not lower than this threshold, UL overload is triggered]

ULOLCRELTHD, DLOLCRELTHD (CELLLDM): UL/DL OLC release threshold.

[If (UL Load / UL Capacity) of the cell is lower than this threshold, UL overload is stopped]

Additional actions to increase capacity:

Divide users between Gold, Silver and Copper and/or modify their priorities: UserPriority (SCHEDULEPRIOMAP).

Specify a HSDPA-only carrier to avoid basic congestion conditions being triggered.

Introduce an additional carrier.

Page 101: UMTS Traning - 3G Basic 2

BLOCKING:

VS.RAC.NewCallRequest.Fail.HSUPANum.Cong: Number of failures in the RRC or RAB SETUP procedure.

VS.RAB.RelReqPS.BE.HSUPA.Cong.Golden, VS.RAB.RelReqPS.BE.HSUPA.Cong.Silver, VS.RAB.RelReqPS.BE.HSUPA.Cong.Copper: Number of released PS BE RABs beared on HSUPA.

VS.RAC.SHO.Fail.HSUPANum.Cong: Number of failures in the SHO procedure.

VS.RAC.HHO.Fail.HSUPANum.Cong: Number of failures in the HHO procedure.

VS.RAC.TrChSwitch.Fail.HSUPANum.Cong: Number of failures in the Channel Switch procedure.

UTILIZATION:

VS.HSUPA.UE.Mean.Cell: Number of UEs in CELL_HSUPA state in a cell.

In case of CAC based on the number of HSUPA users, the controlling parameter is:

MaxHsupaUserNum (CELLCAC): Maximum HSUPA user number (based on cell type and available HSUPA power and code resources). Its value is related to the presence of the following features:

WRFD-01061211: 20 HSUPA Users per Cell.

WRFD-010634: 60 HSUPA Users per Cell.

HSUPA Utilization Ratio(Cell) = [maxHours(VS.HSUPA.UE.Mean.Cell) / MaxHsupaUserNum]*100%.

Page 102: UMTS Traning - 3G Basic 2

Basic Congestion is a ‘normal’ situation and the ideal LDR action for HSUPA users is inter-frequency handover to balance the load. Overload Congestion instead requires the release of HSUPA users. Overload Congestion is triggered by: ULOLCTRIGTHD, DLOLCTRIGTHD (CELLLDM): UL/DL OLC

trigger threshold.

ULOLCRELTHD, DLOLCRELTHD (CELLLDM): UL/DL OLC release threshold.

Additional actions to increase capacity: Divide users between Gold, Silver and Copper and/or

modify their priorities: UserPriority (SCHEDULEPRIOMAP).

Specify a HSUPA-only carrier to avoid basic congestion conditions being triggered.

Introduce an additional carrier.

Page 103: UMTS Traning - 3G Basic 2

BLOCKING:

VS.RRC.Rej.ULIUBBandCong: Number of RRC Connection Reject.

VS.RAB.FailEstab.CS.ULIUBBand.Cong: Number of CS RABs unsuccessfully established.

VS.RAB.FailEstab.PS.ULIUBBand.Cong: Number of PS RABs unsuccessfully established.

VS.RAC.SHO.Fail.ULIub.Cong: Number of failures in the SHO procedure.

VS.RAC.HHO.Fail.ULIub.Cong: Number of failures in the HHO procedure.

VS.RAC.TrChSwitch.Fail.ULIub.Cong: Number of failures in the Channel Switch procedure.

VS.LCC.LDR.Num.ULIub: Number of times a cell is in LDR State due to UL Iub Transmission Resource Congestion.

VS.LCC.LDR.Time.ULIub: Duration in seconds of LDR State due to UL Iub Transmission Resource Congestion.

VS.IUB.CongUL: Number of UL congestions on Iub Interface.

UTILIZATION:

Consumed vs. configured Iub bandwidth:

IUB UL Bandwidth Utilizing Ratio = [(VS.ATMUlAvgUsed.1+VS.ATMUlAvgUsed.2+VS.ATMUlAvgUsed.3+VS.ATMUlAvgUsed.4+VS.IPUlAvgUsed.1+VS.IPUlAvgUsed.2+VS.IPUlAvgUsed.3+VS.IPUlAvgUsed.4)/(VS.ATMUlTotal.1+VS.ATMUlTotal.2+VS.ATMUlTotal.3+VS.ATMUlTotal.4+VS.IPUlTotal.1+VS.IPUlTotal.2+VS.IPUlTotal.3+VS.IPUlTotal.4)]*100%.

VS.ATMUlAvgUsed.x: Average used UL bandwidth on an ATM physical port during a measurement period.

VS.IPUlAvgUsed.x: Average used UL bandwidth on an IP physical port during a measurement period.

VS.ATMUlTotal.x: Available UL bandwidth of an ATM physical port during a measurement period.

VS.IPUlTotal.x: Available UL bandwidth of an IP physical port during a measurement period.

Page 104: UMTS Traning - 3G Basic 2

In case of CAC based on Iub resources:

Reserved BW for RT service (signalling, voice, streaming) = MBR x Activity Factor

Reserved BW for NRT service (interactive, background) = GBR x Activity Factor

Only GBR could be an option to avoid CAC being triggered.

In case of LDR based on Iub resources, triggering can be controlled through:

FWDCONGBW, BWDCONGBW: Forward/Backward congestion threshold.

[If the available forward/backward bandwidth is less than or equal to this value, forward/backward congestion control is triggered]

FWDCONGCLRBW, BWDCONGCLRBW: Fwd/Bwd congestion clear threshold.

[If the available forward/backward bandwidth is greater than this value,forward/backward congestion control is stopped]

Iub congestion control is implemented in a separate processing module, so its functionality is not controlled by LDR switches. In the case of Iub congestion, however, LDR actions are applied to congestion resolution.

When Iub congestion counters are not null:

Control that NodeB was not unavailable during the period of congestion:

VS.NodeB.UnavailTime.OM

Optimize triggering thresholds.

Optimize LDR actions.

Eventually increase Iub capacity.

Type of Service UL/DL Default Activity

Factor (%)

General common channel UL 70

IMS SRB UL 15

SRB UL 15

AMR voice UL 70

R99 CS conversational UL 100

R99 CS streaming UL 100

R99 PS conversational UL 70

R99 PS streaming UL 100

R99 PS interactive UL 100

R99 PS background UL 100

HSUPA SRB UL 50

HSUPA IMS SRB UL 15

HSUPA voice UL 70

HSUPA conversational UL 70

HSUPA streaming UL 100

HSUPA interactive UL 100

HSUPA background UL 100

Page 105: UMTS Traning - 3G Basic 2

BLOCKING:

VS.RRC.Rej.DLIUBBandCong: Number of RRC Connection Reject.

VS.RAB.FailEstab.CS.DLIUBBand.Cong: Number of CS RABs unsuccessfully established.

VS.RAB.FailEstab.PS.DLIUBBand.Cong: Number of PS RABs unsuccessfully established.

VS.RAC.SHO.Fail.DLIub.Cong: Number of failures in the SHO procedure.

VS.RAC.HHO.Fail.DLIub.Cong: Number of failures in the HHO procedure.

VS.RAC.TrChSwitch.Fail.DLIub.Cong: Number of failures in the Channel Switch procedure.

VS.LCC.LDR.Num.DLIub: Number of times a cell is in LDR State due to DL Iub Transmission Resource Congestion.

VS.LCC.LDR.Time.DLIub: Duration in seconds of LDR State due to DL Iub Transmission Resource Congestion.

VS.IUB.CongDL: Number of DL congestions on Iub Interface.

UTILIZATION:

Consumed vs. configured Iub bandwidth:

IUB DL Bandwidth Utilizing Ratio = [(VS.ATMDLAvgUsed.1+VS.ATMDLAvgUsed.2+VS.ATMDLAvgUsed.3+VS.ATMDLAvgUsed.4+VS.IPDLAvgUsed.1+VS.IPDLAvgUsed.2+VS.IPDLAvgUsed.3+VS.IPDLAvgUsed.4)/(VS.ATMDLTotal.1+VS.ATMDLTotal.2+VS.ATMDLTotal.3+VS.ATMDLTotal.4+VS.IPDLTotal.1+VS.IPDLTotal.2+VS.IPDLTotal.3+VS.IPDLTotal.4)]*100%.

VS.ATMDLAvgUsed.x: Average used DL bandwidth on an ATM physical port during a measurement period.

VS.IPDLAvgUsed.x: Average used DL bandwidth on an IP physical port during a measurement period.

VS.ATMDLTotal.x: Available DL bandwidth of an ATM physical port during a measurement period.

VS.IPDLTotal.x: Available DL bandwidth of an IP physical port during a measurement period.

Page 106: UMTS Traning - 3G Basic 2

METHODOLOGY:

In case of CAC based on Iub resources: Reserved BW for RT service (signalling, voice, streaming) = MBR x Activity Factor

Reserved BW for NRT service (interactive, background) = GBR x Activity Facto

Only GBR could be an option to avoid CAC being triggered.

In case of LDR based on Iub resources, triggering can be controlled through: FWDCONGBW, BWDCONGBW: Forward/Backward congestion threshold.

FWDCONGCLRBW, BWDCONGCLRBW: Fwd/Bwd congestion clear threshold.

Iub congestion control is implemented in a separate processing module, so its functionality is not controlled by LDR switches. In the case of Iub congestion, however, LDR actions are applied to congestion resolution.

When Iub congestion counters are not null: Control that NodeB was not unavailable during the period of congestion:

VS.NodeB.UnavailTime.OM

Optimize triggering thresholds.

Optimize LDR actions.

Eventually increase Iub capacity.

Type of Service UL/DL Default Activity

Factor (%)

General common channel DL 70

IMS SRB DL 15

MBMS common channel DL 100

SRB DL 15

AMR voice DL 70

R99 CS conversational DL 100

R99 CS streaming DL 100

R99 PS conversational DL 70

R99 PS streaming DL 100

R99 PS interactive DL 100

R99 PS background DL 100

HSDPA SRB DL 50

HSDPA IMS SRB DL 15

HSDPA voice DL 70

HSDPA conversational DL 70

HSDPA streaming DL 100

HSDPA interactive DL 100

HSDPA background DL 100

EFACH channel DL 20

Page 107: UMTS Traning - 3G Basic 2