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8/18/2019 UK VDF HSDPA Throughput Optimization Pptx
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HUAWEI TECHNOLOGIES CO., LTD.
www.huawei.com
Huawei Confidential
UK VDF HSDPA ThroughputOptimization
Liuaizhong 13 878
8/18/2019 UK VDF HSDPA Throughput Optimization Pptx
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HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential Page 2
Basic of HSDPA Throughput
Users to transmit data
Power
Channel code
Data attributes
Data transfer
User n
Data transferUser 2
Available resources
Required resources
Middle statistics
HSDPA Scheduling
CQI
Data transfer
of User 1
Training: UMTS HSPA Data Transmission Performance Improvement Training
TG: 《URFSTG00325-Troubleshooting Guide to UMTS PS Data Transmission Problems-A-V2R1.doc》
Link: http://support.huawei.com/support/pages/kbcenter/view/product.do?actionFlag=detailProductSimple&web_doc_id=SE0000500963&doc_type=123-
2&doc_type=123-2/support/pages/kbcenter/view/product.do?actionFlag=detailProductSimple&web_doc_id=SE0000500963&doc_type=123-2
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HUAWEI TECHNOLOGIES CO., LTD. Huawei ConfidentialPage 3
SGSN
RNC
NodeB
Water tankWater is discharged from the water tan
pool
Water is poured to the belt conveyer thr
valve-controlled water pipe
The valve size is determined by the be
conveyer.
The belt conveyer fills water to the b
certain rate.
Basic of HSDPA Data Transmission Model
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HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential Page 4
ISSUE 1: HSDPA throughput can not get the target after swap in Glasgow 1B cluster;
ISSUE 2: DT throughput can not get the target;
ISSUE 3: Customer complain the PS data rate very low.
ISSUE: HSDPA Throughput vs. Target in Glasgow 1B
8/18/2019 UK VDF HSDPA Throughput Optimization Pptx
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HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential Page 5
HSDPA Throughput issue analysis
Analysis flow Action Needs
Action of Parameter opt
Resource check
Parameter audit
TOP Cell analysis
TG: 《URFSTG00325-Troubleshooting Guide to UMTS PS Data Transmission Problems-A-V2R1.doc》
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HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential Page 6
Out of RAN
Low HS
Throug
Some Server unstable
UE
Resource Uu Interface
Server
Power
Limitation
CQI
No Adjust by
Dynamic BLER
Schedule Algorithm
Code
Iub
Transmission
not enough data in Buffer
E1 num not
enough Coverage
Schedule
Resource
Allocate Method
Limitation
L2L swap
MPO not
proper
Transmission
Transmission limitation
Operator
tariff policy
adjust
tariff
policy
More high-cat UE
CAT
A lot small-packet
service in HSDPA
Service
Type
Large packet service
even
TP of
Access
More UE access in
the border of Cell
UE access
even in cell
center
HSDPA Throughput issue analysis
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HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential Page 7
HSDPA Throughput issue analysis
Cause ction nalysis Optimization
Resource Allocate
Method
Parameter check
Top cell check
It is difficulty to divide the cell to ‘power limit’ or ‘code limit’,the ‘power and code balance’ method is better.
1, parameter tuning whole net
2, raise a RM to R&D to set thdefault value in R14
No Adjust by
Dynamic BLERParameter check
BE (non-conversation) can get better throughput based on
the real channel quality.
1, parameter tuning whole net
2, raise a RM to R&D to set th
default value in R14
A lot small-packet
service in HSDPA
Top cell check
Customer complain
1, Optimize the status transfer timer to put the small-packet
user to FACH
2, tuning parameter to make sure the user can transfer
status in HSDPA quickly.
1, parameter tuning in top cells
2, expansion 2nd SCCPCH
MPO not proper Parameter check
The UE measures the Ec/No of the Common Pilot Channel(CPICH) and adds a Measurement Power Offset (MPO) as
the Ec/No estimation value of the HS-PDSCH, to modify
the SNR of channel evaluation.
parameter tuning in top cells
E1 num not enoughResource check
Top cell checkThe Iub limit the throughput in some hotspots.
E1 expansion or change to IP(
not control)
not enough data in
Buffer
Top cell check
Customer complainThis is the limitation of server. None
More UE access in
the border of Cell
Top cell check
Customer complain The coverage have extension after the 3rd
carrier activation.
Need U900 activation to optim
the coverage of top cell.
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8/18/2019 UK VDF HSDPA Throughput Optimization Pptx
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OPT 2. Configuring CQI Adjustment Based on Dynamic BLER Target
SET MACHSPARA: LOCELL=0, CQIADJALGOFNONCON=CQI_ADJ_BY_DYN_BLER ;With this feature, the NodeB can dynamically select the optimum BLER target value based on the channel quality fluctu
of HSDPA users. The NodeB then adjusts the Channel Quality Indicator (CQI) accordingly, improving user throughput a
throughput.
NO_CQI_ADJ : The UE measures the Ec/No of the Common Pilot Channel (CPICH) and adds a Measurement Power O
(MPO) as the Ec/No estimation value of the HS-PDSCH. That is, the UE assumes that the NodeB transmits the HS-PD
according to CPICH Power + MPO. Then, add the SF gain 10 * log16 to obtain the SNR of the HS-PDSCH. Obtain the
according to the relationship between the SNR and CQI of the simulated HS-PDSCH.
CQI_ADJ_BY_IBLER : 1st SBLER indicates the BLER of initial data transmission, also called IBLER. With this feature ,
can adjust CQI to a proper value according IBLER . But in some scenario ,If the SBLER is always around 10% no matt
you move the position, it may results from enabling the function of channel adjustment.
HSDPA Throughput Optimization
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OPT 3. status transfer parameter optimization
HSDPA Throughput Optimization
MML Parameter Default value Opt value
SET UUESTATETRANS
BeF2DTvmTimeToTrig D0 D640
BeF2HTvmTimeToTrig D0 D640
BeF2ETvmTimeToTrigD0
D640
BeH2FTvmTimeToTrig D5000 D2560
D2FTvmTimeToTrig D5000 D2560
SET
UUESTATETRANSTIMER
BeD2FStateTransTimer 5 2
BeH2FStateTransTimer 5 2
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The HSDPA throughput has a steady improvement after swap in the last 30 days.
The average HSDPA throughput reach the target 1776 bps.
HSDPA Throughput Optimization- OPT1&2&3
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OPT 4. Modify Cell HSDPA Parameters (Recommended value of Power Compensate is set to 1~1.5)
MOD UCELLHSDPA : CellId=0, HsPdschMPOConstEnum = 0;This parameter named Measure Power Offset Constant is used to compute measurement power offset. Measurement
offset is used by UE to obtain total received HS-PDSCH power. The calculation for Measure Power Offset is as shown
CQI = CPICH Ec/No + MPO + 10 * log16 + 4.5
= SNRcpich + MPO + 4.5
= SNRhs-pdsch (based on assumed power) + 4.5 (with a round process, depending on the UE implementa
MPO = min(13, Pcell-Pcpich - MPO constant) dB , The MPO constant is 2.5 by default(For details of the IE "Measure Power Offset", refer to 3GPP TS 25.214)
.
HSDPA Throughput Optimization
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HSDPA Throughput Optimization- OPT 4
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HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential
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HUAWEI TECHNOLOGIES CO LTD Huawei Confidential