141140616 3G Capacity Monitoring Sharing Session Material

3G Capacity Monitoring Sharing Session Material . October 2012

www.huawei.com

Contents 

RF Power Capacity Upgrade Proposal



RF Code Capacity Upgrade Proposal



CE Capacity Upgrade Proposal



WBBP upgrade Proposal



Iub Capacity Upgrade Proposal



Paging Monitoring

Huawei Confidential

Page 1

3G CAPACITY RESOURCE

Huawei Confidential

Page 2

Power Utilization 

Power is shared by all services in one cell



PS will use spare power apart from that be used by CS



HSDPA will use the spare power apart from that of R99



HSDPA throughput probably limited by power available during busy hour



Huawei current maximum PA is 80 W



Maximum recommendation power used by common channel around 20% from cell power Power

3GPP Release 99

3GPP Release 5

Power

Unused power

HS-DSCH

Pmax-R99

Dedicated channels (power controlled)

Dedicated channels (power controlled)

Common channels

Common channels t

Power usage with dedicated channels channels

t HS-DSCH with dynamic power allocation

Huawei Confidential

Page 3

Power Utilization Formula Average Power Utilization Rate (%)

(10^(([VS.MeanTCP]-[MaxPowerPerCell])/10))*100

Note: VS.MeanTCP: Mean Transmitted Power of Carrier for Cell (dBm) MaxPowerPerCell: Maximum transmission power for cell (dBm)

Huawei Confidential

Page 4

RF POWER UPGRADE PROCESS Weekly Measurement

(OR) Total TCP > 70% Power Cong > 0.8%

Power Utilization target: 60% No End

Yes 2nd Carrier Already ?

No 2nd Carrier Proposal

Yes Max Tx Power ? PA >= 460

No PA Upgrade Proposal

Yes F1/F2 HSDPA Load Balancing Already ?

Yes

No

F1/F2 HSDPA Load Balancing Proposal Capacity New Site Proposal Huawei Confidential

RF POWER UPGRADE CRITERIA Scenario (OR)

Aggregated Measurement

Counter Measurement

Threshold

1st Scenario (utilization)

Weekly Average

Busy Hour Tx Power Utilization(ave)

70%

2nd Scenario (congestion failures)

Weekly Average

Busy Hour RAB Power Congestion Ratio(ave)

0.8%

RAB_PS_Power_Cong_Ratio 100*Sum([VSRABFailEstabPSDLPowerCong])/Sum(([VSRABAttEstabPSBkg]+[VSRABAttEstabPSInt]))

RNC UL/DL Power Congestion Counters VS.RRC.Rej.ULPower.Cong VS.RRC.Rej.DLPower.Cong VS.RAB.FailEstabCS.ULPower.Cong VS.RAB.FailEstabCS.DLPower.Cong VS.RAB.FailEstabPS.ULPower.Cong VS.RAB.FailEstabPS.DLPower.Cong

Huawei Confidential

Performance indicator Impact to Power Utilization (1/3) 

SHO Overhead

High SHO overhead means you have high SHO/single serving cell ratio. This is caused by insufficient down tilt on the antennas or not optimized network design. Also is quite likely you have higher pilot pollution in the network. Solution: analyze the cell coverage and try to limit the cell coverage to it's designated area. The smaller the overlapping areas between the cells - the smaller SHO overhead. Normally SHO overhead around 30%

SHO has the following advantages: SHO ensures the seamless cell change and increases the network coverage on the uplink link direction (UL). The SHO combining gain mitigates propagation effects, such as fast fading and shadowing. The SHO combining gain might lead to a transmit power reduction, which reduces the interference in the network on the UL On the other hand, SHO also has some disadvantages: At each cell extra codes, hardware, and downlink (DL) power have to be allocated for the additional SHO links. This leads to a higher outage probability and a decrease in the network capacity. Especially the DL power is a very scarce resource, since it is shared by all MS in the cell. The trend for services with asymmetrical data rates and High–Speed Downlink Packet Access (HSDPA) intensifies the DL cell power deficiency.

Huawei Confidential

Page 7

Performance indicator Impact to Power Utilization (2/3) SHO Overhead Formula:

This KPI is used to check the consumption of network resources due to soft handover in an RNC or a Cell. It considered the radio link quantity during the soft handover.

Huawei Confidential

Page 8

Performance Indicator Impact to Power Utilization (3/3) 

Overshooting

Cell serve larger area than plan area. This condition can be checked from the propagation delay statistic. We have to make sure that this cell serve larger area, not caused by problem on the nearest site close to respective area

Huawei Confidential

Page 9

RF Code & HSPDSCH Code Utilization 

Each WCDMA cell consist of 16 SF16



RF code shared by R99 and HSPA services



HSPDSCH code will determine throughput RAB HSDPA



HSPDSCH code license shared by all cell in one node B



RF code utilization will be used for second carrier upgrade proposal, while HSDPSCH code utilization used for HSPDSCH license code upgrade proposal

100*((([VSSingleRABSF4]+[VSMultRABSF4])*64)+(([VSSingleRABSF8]+[VSMultRABSF8])*32)+(([VSSingleRABS Avg_Code_Utilization F16]+[VSMultRABSF16])*16)+(([VSSingleRABSF32]+[VSMultRABSF32])*8)+(([VSSingleRABSF64]+[VSMultRABS F64])*4)+(([VSSingleRABSF128]+[VSMultRABSF128])*2)+([VSSingleRABSF256]+[VSMultRABSF256]))/256

HSPDSCH_CODE_UTILIZATION 100*[VSPdschCodeUsedMean]/[HSPDSCH_CODE]

Huawei Confidential

Page 10

RF CODE UPGRADE PROCESS Weekly Measurement

Code Util > 80 % OR Code Cong > 0.8%

No

Code HSDPA Util > 70%

2nd Carrier Already ?

2nd Carrier Already ?

Yes

Yes No

F1/F2 HSDPA Load Balancing Already ?

End

Yes

Yes No

No

No

HS Code/NodeB < 45

No

HS Code/NodeB < 30

No

Yes

Yes

Yes 2nd Carrier Proposal

Capacity New Site Proposal

F1/F2 Load Balancing

HSDPA Code Upgrade to 45

Huawei Confidential

HSDPA Code Upgrade to 30

2nd Carrier Proposal

RF CODE UPGRADE CRITERIA Scenario (OR function)

Aggregated Measurement

Counter Measurement

Threshold

1st Scenario (utilization)

Weekly Average

Busy Hour of Code Util(ave)

80%

Weekly Average

Busy Hour of HSDPA Code Util(ave)

70%

Weekly Average

Busy Hour RAB Code Cong Ratio(ave)

0.8%

2nd Scenario (congestion failures)

RAB_PS_Code_Cong_Ratio 100*Sum([VSRABFailEstabPSCode.Cong])/Sum(([VSRABAttEstabPSBkg]+[VSRABAttEstabPSInt]))

RNC UL/DL Code Congestion Counters VS.RRC.Rej.Code.Cong VS.RAB.FailEstabCS.Code.Cong VS.RAB.FailEstabPS.Code.Cong

Huawei Confidential

Iub Traffic Data Input Subscribers Subs per NodeB

Iub Traffic

Total BW

CS Iub Bandwidth Iub Bandwidth

CS Traffic Voice Traffic VP Traffic

GoS Requirements

PS Iub Bandwidth HSPA Iub Bandwidth

PS Traffic PS64 Throughput PS128 Throughput PS384 Throughput

PS Retransmission HSPA Traffic

Bandwidth for Traffic Common Channel Bandwidth Signalling Bandwidth O&M Bandwidth

Iub is shared among all traffic in one node B. PS and HSPA is best effort Huawei Confidential

Page 13

Iub Utilization Formula Iub Over IP

Note: TX BW, RX BW Unit: Kbps

Iub Over ATM

Note: TX BW, RX BW Unit: Kbps Conversion Formula: Number of E1 * 1904

Huawei Confidential

Page 14

IUB UPGRADE PROCESS Weekly Measurement

Iub E1 < 4E1? < 8 Mbps

Yes

Upgrade Iub to 4 E1, 8 Mbps

No OR UL Iub Util > 70 % DL Iub Util > 70 % Iub Cong. >0.8%

Yes Upgrade Iub

No

End

Iub Utilization target: 60%

Huawei Confidential

IUB UPGRADE CRITERIA Scenario (OR function)

Aggregated Measurement

Counter Measurement

Threshold

1st Scenario (utilization)

Weekly Average

Busy Hour of Iub UL/DL Max Utilization(ave)

70%

2nd Scenario (congestion failures)

Weekly Average

Busy Hour RAB IUB Cong Ratio

0.8%

RAB_PS_Iub_Cong_Ratio 100*Sum([VSRABFailEstabPSULIUBBandCong]+[VSRABFailEstabPSDLIUBBandCong])/Sum(([VSRABAttEstabPSBkg]+[VSRABAttEstabPSInt]))

RNC UL/DL Iub Congestion Counters VS.RRC.Rej.ULIUBBand.Cong VS.RRC.Rej.DLIUBBand.Cong VS.RAB.FailEstabCS.ULIUBBand.Cong VS.RAB.FailEstabCS.DLIUBBand.Cong VS.RAB.FailEstabPS.ULIUBBand.Cong VS.RAB.FailEstabPS.DLIUBBand.Cong

It’s better to use monthly data, using average maximum weekly data. Maximum weekly data taken from maximum hourly data among respective week Huawei Confidential

Definition of Channel Element A Channel Element is the base band resource required in the Node B to provide capacity for one voice channel, including control plane signaling, compressed mode, transmit diversity and softer handover. 

DBS3900/BTS3900 Uplink:

Channel Elements for HSUPA 

max. 1536 CE

Downlink: max. 1536 CE



Channel Elements for R99 Bearers

HSUPA shares all the Uplink Channel Elements Resource with R99 services. The Spreading Factor determines the Channel Elements consumed by the HSUPA service.

Note: HSUPA 10 ms TTI

Huawei Confidential

Page 17

Huawei Channel Elements Features 

Channel Elements pooled in one NodeB



No need extra R99 CE resource for CCH



--- reserved CE resource for CCH



No need extra CE resource for TX diversity



No need extra CE resource for Compressed Mode



--- reserved resources for Compressed Mode



No need extra CE resource for Softer HO



HSDPA does not occupy R99 CE resource

 

--- separate module for HSDPA HSUPA shares CE resource with R99 services

Huawei Confidential

Page 18

Channel Elements for HSDPA 

The Base Band resources for R99 and HSDPA are separate.



HS-DSCH does not consume R99 Channel Elements.



HS-SCCH does not consume R99 Channel Elements.



HS-DPCCH does not occupy R99 Channel Elements.



Downlink A-DCH does not occupy R99 Channel Elements.

BB Unit

UL R99/HSUPA CEs HS-DPCCH

UL

Common channel

DL R99 CEs

Reserved CEs and cost free for common channels Dedicated processing resource for HSDPA, no CE consumption for HSDPA

HS_DSCH

DL

Common channel

Huawei Confidential

Page 19

CHANNEL ELEMENT UPGRADE PROCESS UPGRADE CE Utilization target: 60%

End

Weekly Measurement

No (OR) CE UL Util > 70% CE DL Util > 70% CE Cong > 0.8%

Yes

No

CE UL Util < 20% OR CE DL Util < 20%

Yes N=1

No

DOWNGRADE

HW CE > SW CE

CE SW Downgrade N.16 N=N+1

Yes CE SW Upgrade to N.384

CE UL Util > 40% OR CE DL Util > 40%

No

Yes CE HW & SW Upgrade to N.384

UL AND DL CE HW – CE SW > 384

Yes

Huawei Confidential

CE SW Downgrade N.16 No CE HW Downgrade 384

CHANNEL ELEMENT UPGRADE CRITERIA Scenario (OR function)

Aggregated Measurement

Counter Measurement

Threshold

1st Scenario (utilization)

Weekly Average

Busy Hour of CE Util UL(ave)

70%

Weekly Average

Busy Hour of CE Util DL(ave)

70%

Weekly Average

Busy Hour RAB CE Cong Ratio(ave)

0.8%

2nd Scenario (congestion failures)

RAB_PS_CE_Cong_Ratio 100*Sum([VSRABFailEstabPSULCECong]+[VSRABFailEstabPSDLCECong])/Sum(([VSRABAttEstabPSBkg]+[VSRABAttEstabPSInt]))

RNC UL/DL CE Congestion Counters VS.RRC.Rej.UL.CE.Cong VS.RRC.Rej.DL.CE.Cong VS.RAB.FailEstabCS.ULCE.Cong VS.RAB.FailEstabCS.DLCE.Cong VS.RAB.FailEstabPS.ULCE.Cong VS.RAB.FailEstabPS.DLCE.Cong

Huawei Confidential

Channel Element Utilization Formula UL CE Utilization (%)

100*VS.LC.ULMean.LicenseGroup.Shared/VS.LC.ULCreditAvailable.Shared

DL CE Utilization (%)

100*VS.LC.DLMean.LicenseGroup.Shared/VS.LC.DLCreditAvailable.Shared

Note:

VS.LC.ULMean.LicenseGroup.Shared: The Average number of shared UL CEs consumed by an operator, or by HSUPA service. VS.LC.DLMean.LicenseGroup.Shared: The Average number of shared DL CEs consumed by an operator VS.LC.ULCreditAvailable.Shared: The Configured UL CEs for the Shared Group

VS.LC.DLCreditAvailable.Shared: The Configured DL CEs for the Shared Group

Huawei Confidential

Page 22

WBBP Upgrade proposal 

WBBP is Huawei WCDMA baseband processing unit



Maximum 4 boards WBBP installed in BTS/DBS 3900



Combination with WMPT & UTRP will determine number of radio link can be supported by node B



Monitoring capacity radio link can be supported, can be check from CNBAP utilization formula



WBBP board upgrade also can be triggered by lack of channel element hardware

CNBAP Usage per second (VS.IUB.AttRLAdd+VS.IUB.AttRLSetup+(2*VS.IUB.AttRLRecfg))/3600

CNBAP Utilization (%)

100*CNBAP Usage per second/CNBAP Capacity

Note: CNBAP Capacity refer to table board installed in each node B

Huawei Confidential

Page 23

WBBP UPGRADE CRITERIA Scenario (OR function)

Aggregated Measurement

Counter Measurement

Threshold

Scenario (utilization)

Weekly Average

Busy Hour of CNBAP Utilization(ave)

50%

SPECIFICATION Boards

RAN 10/11

RAN 12

RAN 13

WMPT+1WBBP

40 CNBAP/s

55 CNBAP/s

60 CNBAP/s

WMPT+2WBBP

80 CNBAP/s

110 CNBAP/s

120 CNBAP/s

WMPT+3WBBP

80 CNBAP/s

130 CNBAP/s

170 CNBAP/s

WMPT+4WBBP

80 CNBAP/s

130 CNBAP/s

170 CNBAP/s

UTRP+WMPT+2WBBP

80 CNBAP/s

110 CNBAP/s

180 CNBAP/s

UTRP+WMPT+3WBBP

130 CNBAP/s

165 CNBAP/s

180 CNBAP/s

UTRP+WMPT+4WBBP

170 CNBAP/s

200 CNBAP/s

240 CNBAP/s

RNC CNBAP Congestion Counters VS.RRC.Rej.RL.Fail

Huawei Confidential

WBPP UPGRADE PROCESS RNC CNBAP Congestion Counters

Weekly Measurement

VS.RRC.Rej.RL.Fail

No CNBAP Utilization > 50 %

End

Yes No

No WBBP < 3

Yes ADD WBBP

UTRP Already?

ADD UTRP

Yes No WBBP = 4

ADD WBBP

Yes Split Node B

Huawei Confidential

Paging Monitoring 

Paging is one of important performance indicator because it will impact to user perceived especially A number.



LAC & RAC splitting should be consider in case paging congestion greater than 1% or paging attempt greater than 500K/hour



PS paging is much more than CS paging, that’s why RAC splitting more often choose than LAC splitting

Paging Loss (%) 100*(VSRRCPaging1LossPCHCongCell/VSUTRANAttPaging1) Paging Util (%) 100*([VSUTRANAttPaging1])/(3600*5*/0.01) Paging Attempt [VSUTRANAttPaging1]

Huawei Confidential

Page 26

Why Paging Utilization