141140616 3G Capacity Monitoring Sharing Session Material

www.huawei.com

3G Capacity Monitoring

Sharing Session Material

.

October 2012

Huawei Confidential

Contents

Page 1

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

3G CAPACITY RESOURCE

Page 2

Huawei Confidential

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

Page 3

Dedicated channels (power controlled)

Common channels

Power usage with dedicated channels channels

t

Unused power

Power

HS-DSCH with dynamic power allocation t

Dedicated channels (power controlled)

Common channels

HS-DSCH

Power 3GPP Release 99 3GPP Release 5

Pmax-R99

Huawei Confidential

Power Utilization Formula

Average Power Utilization Rate (%) (10^(([VS.MeanTCP]-[MaxPowerPerCell])/10))*100

Page 4

Note:

VS.MeanTCP: Mean Transmitted Power of Carrier for Cell (dBm)

MaxPowerPerCell: Maximum transmission power for cell (dBm)

Huawei Confidential

RF POWER UPGRADE PROCESS Weekly Measurement

(OR)

Total TCP > 70%

Power Cong > 0.8%

2nd Carrier

Already ?

Max Tx Power ?

PA >= 460

F1/F2 HSDPA Load

Balancing Already ?

End

2nd Carrier Proposal

PA Upgrade Proposal

F1/F2 HSDPA Load

Balancing Proposal

Capacity New Site

Proposal

No

Yes

No

Yes

No

Yes

No

Yes

Power Utilization target: 60%

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.

Page 7

Huawei Confidential

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.

Page 8

Huawei Confidential

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

Page 9

Huawei Confidential

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

Page 10

Avg_Code_Utilization

100*((([VSSingleRABSF4]+[VSMultRABSF4])*64)+(([VSSingleRABSF8]+[VSMultRABSF8])*32)+(([VSSingleRABS

F16]+[VSMultRABSF16])*16)+(([VSSingleRABSF32]+[VSMultRABSF32])*8)+(([VSSingleRABSF64]+[VSMultRABS

F64])*4)+(([VSSingleRABSF128]+[VSMultRABSF128])*2)+([VSSingleRABSF256]+[VSMultRABSF256]))/256

HSPDSCH_CODE_UTILIZATION 100*[VSPdschCodeUsedMean]/[HSPDSCH_CODE]

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Y

Weekly Measurement

Code Util > 80 %

OR

Code Cong > 0.8%

2nd Carrier

Already ?

F1/F2 HSDPA Load

Balancing Already

?

Capacity New

Site Proposal

No

Yes Yes

Code HSDPA Util >

70%

2nd Carrier

Already ?

HS Code/NodeB

< 45

HS Code/NodeB

< 30 Yes

Yes

No

No

Yes

Yes

Yes

No

2nd Carrier

Proposal F1/F2 Load

Balancing

HSDPA Code

Upgrade to 45

HSDPA Code

Upgrade to 30

2nd Carrier

Proposal

End No

No

No

RF CODE UPGRADE PROCESS

Huawei Confidential

Y

RF CODE UPGRADE CRITERIA

RNC UL/DL Code Congestion Counters

VS.RRC.Rej.Code.Cong

VS.RAB.FailEstabCS.Code.Cong

VS.RAB.FailEstabPS.Code.Cong

Scenario

(OR function)

Aggregated

Measurement

Counter


1st Scenario

(utilization)

Weekly Average Busy Hour of Code Util(ave) 80%

Weekly Average Busy Hour of HSDPA Code Util(ave) 70%

2nd Scenario

(congestion failures) Weekly Average Busy Hour RAB Code Cong Ratio(ave) 0.8%

RAB_PS_Code_Cong_Ratio

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

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Iub Traffic Data

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

Page 13

CS Traffic Voice Traffic

VP Traffic

GoS Requirements

Subscribers Subs per NodeB

PS Traffic PS64 Throughput

PS128 Throughput

PS384 Throughput

PS Retransmission

HSPA Traffic

CS Iub Bandwidth

PS Iub Bandwidth

Bandwidth for

Traffic

HSPA Iub

Bandwidth

Common Channel

Bandwidth

Signalling

Bandwidth

O&M Bandwidth

Iub Bandwidth

Input Iub Traffic Total BW

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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

Page 14

Huawei Confidential

IUB UPGRADE PROCESS

Weekly Measurement

OR

UL Iub Util > 70 %

DL Iub Util > 70 %

Iub Cong. >0.8%

Upgrade Iub Yes

No

End

Iub E1 < 4E1?

< 8 Mbps

No

Upgrade Iub to 4 E1, 8

Mbps Yes

Iub Utilization target: 60%

Huawei Confidential

IUB UPGRADE CRITERIA

Scenario

(OR function)

Aggregated

Measurement

Counter


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

Page 17

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: max. 1536 CE

Downlink: max. 1536 CE

Channel Elements for R99 Bearers

Channel Elements for HSUPA 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 18

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 19

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.

HS-DPCCH

Common channel

HS_DSCH

DL R99 CEs

UL R99/HSUPA CEs

Common channel

HS-DPCCH

Common channel

HS_DSCH

DL R99 CEs

UL R99/HSUPA CEs

Common channel

DL

UL

Dedicated processing resource for HSDPA, no CE

consumption for HSDPA

Reserved CEs and cost free for common channels

BB Unit

Huawei Confidential

CHANNEL ELEMENT UPGRADE PROCESS

Weekly Measurement

(OR)

CE UL Util > 70%

CE DL Util > 70%

CE Cong > 0.8%

HW CE > SW CE

CE HW & SW Upgrade

to N.384

CE SW Upgrade

to N.384

No

No

Yes

Yes

CE UL Util < 20%

OR

CE DL Util < 20%

CE UL Util > 40%

OR

CE DL Util > 40%

End

N=N+1

CE SW Downgrade N.16

No

No

Yes

Yes

N=1

CE SW Downgrade N.16

UL AND DL

CE HW – CE SW

> 384

CE HW Downgrade 384 Yes

DOWNGRADE

No

UPGRADE CE Utilization target: 60%

Huawei Confidential

CHANNEL ELEMENT UPGRADE CRITERIA Scenario

(OR function)

Aggregated

Measurement

Counter


1st Scenario

(utilization)

Weekly Average Busy Hour of CE Util UL(ave) 70%

Weekly Average Busy Hour of CE Util DL(ave) 70%

2nd Scenario

(congestion failures) Weekly Average Busy Hour RAB CE Cong Ratio(ave) 0.8%

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

Page 22

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

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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

Note:

CNBAP Capacity refer to table board installed in each node B

Page 23

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

CNBAP Utilization (%) 100*CNBAP Usage per second/CNBAP Capacity

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WBBP UPGRADE CRITERIA

Scenario

(OR function)

Aggregated

Measurement

Counter


Scenario

(utilization) Weekly Average Busy Hour of CNBAP Utilization(ave) 50%

RNC CNBAP Congestion Counters

VS.RRC.Rej.RL.Fail

SPECIFICATION

Boards RAN 10/11 RAN 12 RAN 13

WMPT+1WBBP 40 CNBAP/s 55 CNBAP/s 60 CNBAP/s




UTRP+WMPT+2WBBP 80 CNBAP/s 110 CNBAP/s 180 CNBAP/s



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Weekly Measurement

CNBAP Utilization >

50 %

End

No

Yes

WBBP < 3

No

ADD UTRP

Yes

UTRP Already?

ADD WBBP WBBP = 4

ADD WBBP

Split Node B

No

No

Yes

Yes

WBPP UPGRADE PROCESS RNC CNBAP Congestion Counters

VS.RRC.Rej.RL.Fail

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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

Page 26

Paging Loss (%) 100*(VSRRCPaging1LossPCHCongCell/VSUTRANAttPaging1)

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

Paging Attempt [VSUTRANAttPaging1]

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Why Paging Utilization<100% but with Paging Congestion?

Paging Channel Specification

PCH channel support maximum paging 5 user with 1 TTI(Transmission Time Interval,

1TTI=10ms)

Paging Discard Maximum

Paging 5

UE per TTI

Statistic

Period

Because the paging attempt is not stable within the statistic period, some times is higher, some

times is lower, so we will face the paging congestion while the PCH Utilization<100% .

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How big the PCH utilization will trigger paging congestion

Base on the Erlang B Table, if the Number of Channel is 5, and the GOS is 1%, it can bear

1.361 Erl traffic, in other words, the utilization is 27.22% (=1.361/5) while the GOS=1%

The PCH channel can support paging 5 user within 1 TTI,

We can assume the Number of Channel of 5, base on Erlang B table, when the the

utilization just 27.22%, GOS/Congestion Rate=1%.

Base on Erlang B table, the utilization=27.22% will trigger 1% congestion.

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Paging Attempt RNC Gayungan01

Paging Attempt all LAC RAC still less than 500K/Hour

Page 29

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Paging Utilization (%) RNC Sawojajar01

Page 30

Huawei Confidential

Paging Loss (%) RNC Gayungan01

• Paging loss all LAC RAC still less than 1 %

Page 31

Thank you www.huawei.com

141140616 3G Capacity Monitoring Sharing Session Material

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