141140616 3g capacity monitoring sharing session material
TRANSCRIPT
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www.huawei.com
3G Capacity Monitoring
Sharing Session Material
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October 2012
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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
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Huawei Confidential
3G CAPACITY RESOURCE
Page 2
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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
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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)
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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%
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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
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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 HighSpeed Downlink Packet Access (HSDPA) intensifies the DL cell power deficiency.
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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.
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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
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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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Huawei Confidential
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
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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
Measurement Threshold
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
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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%
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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
Its better to use monthly data, using average maximum weekly data. Maximum weekly data taken from maximum hourly data among respective week
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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
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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
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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
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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%
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Huawei Confidential
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%
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
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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
Measurement Threshold
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
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
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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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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, thats why RAC splitting more often choose than LAC splitting
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Paging Loss (%) 100*(VSRRCPaging1LossPCHCongCell/VSUTRANAttPaging1)
Paging Util (%) 100*([VSUTRANAttPaging1])/(3600*5*/0.01)
Paging Attempt [VSUTRANAttPaging1]
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Why Paging Utilization
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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
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Paging Utilization (%) RNC Sawojajar01
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Paging Loss (%) RNC Gayungan01
Paging loss all LAC RAC still less than 1 %
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