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Copyright © Huawei Technologies Co., Ltd. All rights reserved.
5G Radio Network Throughput
Problem Analysis
Copyright © Huawei Technologies Co., Ltd. All rights reserved. Page 2
Objectives
 Upon completion of this course, you will be able to:
 Know the key factors for radio peak throughput calculation
 Implement radio throughput problem isolation
 Implement radio throughput problem optimization
Copyright © Huawei Technologies Co., Ltd. All rights reserved. Page 3
Throughput Optimization Scenario
 Peak throughput test problem: During the peak throughput test, UE can’t reach the target value
 Related radio factors:
 Channel environment is not ideal
 Channel parameters are not optimal
 Driver test throughput test problem: During the driver test, the average throughput can’t reach the
target value
 Related radio factors:
 RF issues (Coverage, interference)
 Abnormal event (Service drop, handover failure)
 Improper parameters
Copyright © Huawei Technologies Co., Ltd. All rights reserved. Page 4
Contents
1. NR Radio Peak Throughput Factor Analysis
2. NR Radio Throughput Problem Optimization
Copyright © Huawei Technologies Co., Ltd. All rights reserved. Page 5
5G Radio Peak Throughput Analysis - Downlink
Copyright © Huawei Technologies Co., Ltd. All rights reserved. Page 6
Key Parameters for DL Peak Throughput
Description Advise to peak throughput achievement
SSB period Indicate the SSB transmission
period
The period can be set largest to reduce SSB
overhead, but it will increase access latency
Sib1Period Indicate the SIB1 transmission
period
For SA, the period can be set largest to
reduce SSB overhead, but it will increase
access latency. For NSA, SIB1 can be
disabled
TRSperiod Indicate the TRS period The period can be set largest to reduce SSB
overhead, for it will impact demodulation
performance in mobility scenario
DlDmrsType Indicate PDSCH DMRS type Type2 in recommended as it has less
overhead, but the performance is worse than
type1
DlDmrsMaxLength Indicate the PDSCH DMRS length 1 symbol is recommend for peak throughput
scenario
Copyright © Huawei Technologies Co., Ltd. All rights reserved. Page 7
Key Parameters for DL Peak Throughput (Cont.)
Parameter Description Advise to peak throughput achievement
DlAdditionDmrsPos Indicate the resource for additional
PDSCH DMRS configuration
For peak throughput scenario, it is recommend not
use additional DMRS
SSB rate match
switch
Indicate whether SSB rate matching
switch is ON or OFF
For peak throughput scenario, it is recommend to
enable SSB rate match
CSI-RS rate match
switch
Indicate whether CSI-RS rate matching
switch is ON or OFF
For peak throughput scenario, it is recommend to
enable CSI-RS rate match
TRS rate match
switch
Indicate whether TRS rate matching
switch is ON or OFF
For peak throughput scenario, it is recommend to
disable TRS rate match
PDCCH rate match Indicate whether PDCCH rate matching
switch is ON or OFF
For peak throughput scenario, it is recommend to
enable CSI-RS rate match and also reduce the
PDCCH RB number
OccupiedSymbolNum Indicate the PDCCH symbol number in
CORESET
1 symbol is recommended
OccupiedRbNum Indicate the PDCCH RB number in
CORESET
We can reduce the PDCCH RB number, at least
24RB are required. Meanwhile, we should enable
PDCCH rate match function
Copyright © Huawei Technologies Co., Ltd. All rights reserved. Page 8
5G Radio Peak Throughput Analysis - Uplink
Copyright © Huawei Technologies Co., Ltd. All rights reserved. Page 9
Key Parameters for UL Peak Throughput
Parameter Description Advise to peak throughput achievement
Format1Rbnumber/
Format3Rbnumber
Indicate long format PUCCH RB
nubmer
Choose the least resource for PUCCH, it will
impact access user number
PRACHConfigurati
onIndex
Indicate time domain PRACH
occasions
Choose the index with the least PRACH
occasion
PUSCH Occupying
PRACH switch
Indicate the whether PUSCH can
occupy PRACH resource
We can enable the switch to increase peak
throughput, but it will impact new UE random
access
Copyright © Huawei Technologies Co., Ltd. All rights reserved. Page 10
Channel Environment For Peak Throughput Test
 Other remarks:
 The distance between the terminal and the AAU must be greater than 20 m to avoid uplink power saturation
 The downlink high Rank depends on the surrounding multipath environment. Try to select the area with
reflection of surrounding trees and buildings and ensure the non-direct path between the test point and base
station antenna. In the uplink performance test, the direct path environment is preferred and the test point
with line of sight is the best location
SSB
RSRP
SSB SINR N SSB RSRP Freq
Offset
CSI-RS
RSRP
CSI-RS
SINR
DMRS0~n
SINR
Requirement -
65dBm~-
75dBm
>3dB The RSRP of the
strongest neighboring
cell is at least 6dB
less than of the
serving cell
(-50,50) -
70dBm
~-
80dBm
>30dB >30dB
Copyright © Huawei Technologies Co., Ltd. All rights reserved. Page 11
Contents
1. NR Radio Peak Throughput Factor Analysis
2. NR Throughput Problem Optimization
Copyright © Huawei Technologies Co., Ltd. All rights reserved. Page 12
E2E Data Transfer Architecture and Factors
CPE
gNodeB BBU
eNodeB BBU
Switch
Router
HSS
MME/UGW Firewall
APP Server
12. TCP
windows/Thread/RTT
Hardware performance
10. Transmission packet loss/bandwidth
X2
11. QCI/AMBR
6. Alarm
7. Parameter
8. Channel calibration
9. Transmission
packet loss
3. UE capacity
RB/Modulation/Feature
1. TCP windows/Thread/RTT
2. Hardware performance
4. SINR/CQI/RI/SRS
5 Channel condition
Factors 1, 2, 3, 6, 7, 9, 10, 11, and 12 affect the Grant and RB, and factors 4, 5, 6, 7, and 8 affect the MCS, BLER, and rank.
Copyright © Huawei Technologies Co., Ltd. All rights reserved. Page 13
General Optimization Flow
 Step1: Check if AMBR subscription rate is enough
 Method: In NSA network, check the SgNB Addition Request message to find the subscription UE-AMBR
 Step2: Check if cell status is normal, clean all the alarms that may impact data throughput
Copyright © Huawei Technologies Co., Ltd. All rights reserved. Page 14
General Optimization Flow (Cont.)
 Step 3: UE capability check
 Supported bandwidth: Indicate the maximum
bandwidth that supported by UE, for sub 6G, it
should be 100MHz
 MIMO layer number: For commercial UE, it should
be 4 layers on downlink, and 2 layers on uplink
 Modulation scheme: 256QAM should be
supported
Copyright © Huawei Technologies Co., Ltd. All rights reserved. Page 15
General Optimization Flow (Cont.)
 UE SRS switching capability
 If UE supports SRS antenna switching function,
gNodeB could adopt SRS beaming weighting
mechanism SRS
 If UE doesn’t support antenna switching function,
only PMI beamforming weight can be used which
has worse performance than SRS weighting
 UE ratemaching capability:
 If UE doesn’t support rate matching, then rate
matching function is not valid for the UE
Copyright © Huawei Technologies Co., Ltd. All rights reserved. Page 16
The Common Problem for Radio Interface
 Radio resource related problem: not enough resource for PDCCH or PDSCH
 DL grant number is less: For 4:1 TDD slot configuration, the DL grant number per second should reach
1600 times
 RB number is less:Allocation RB number is not enough
 Radio environment related problem
 Low MCS
 Low rank
 High PDSCH IBLER
Copyright © Huawei Technologies Co., Ltd. All rights reserved. Page 17
Radio Interface Factors Analysis
Downlink Key Indicator Breakdown
Counter Name DL Grant/S PDSCH RB Num/Slot Avg DL MCS0/1 IBLER Avg DL Rank
Peak Rate Standard 1600 times
100 MHz bandwidth:
267/slot
80 MHz bandwidth: 213/slot
The difference in the actual
Probe statistics: 1 RB to 2
RBs.
256QAM: 27 orders IBLER: 0%
2T4R: 4; 4T8R: 8
Reasonable Range
in Non-Peak-Rate
Scenarios
1500 to 1600
Theoretical value minus 4
RBs to 6 RBs
N/A 9% to 12% N/A
Observation
Method
1. Probe log; 2. OMT log; 3. U2020 Common User monitoring
Affecting Factor
1. AMBR rate limit;
2. Inappropriate PDCP and
RLC parameters
corresponding to QCI;
3. Multi-user scheduling;
4. Missing CCE detection or
CCE allocation failure;
5. Scheduling failure (HARQ
process exhausted);
1. AMBR rate limit
2. Multi-user scheduling;
3. Low RBs due to
insufficient inbound traffic
caused by TCP packet loss
or disorder
1. Coverage and channel environment
2. Absence of CQI reporting because the CSI-RS is not
measured, fixed MCS 4 order scheduling;
3. Parameter settings: CSI-RS port configuration, DMRS
configuration, MCS configuration, IBLER adaptation;
4. Channel calibration failure
1. Parameter settings:
SRS weight, DMRS
configuration, and rank
configuration;
2. Channel calibration
3. External interference
SRS measurement;
4. SRS power
5. Rank adaptive
algorithm;
6. Channel environment
(NLOS and LOS)
Copyright © Huawei Technologies Co., Ltd. All rights reserved. Page 18
Radio Relevant Parameter Monitor
Copyright © Huawei Technologies Co., Ltd. All rights reserved. Page 19
DL Grant and RB Problem Analysis – Insufficient Ingress Traffic
Isolation
 If the inbound traffic is not enough (packet loss from server to gNodeB ), if will definitely impact the
DL grant and RB number. So we can implement MAC padding test to exclude the ingress traffic
problem
 MAC padding function: gNodeB simulate the MAC layer PDU and transmit to particular UE. If the
MAC padding result can’t reach the target data rate, that means the problem occurs on gNodeB
side as well as radio interface
Copyright © Huawei Technologies Co., Ltd. All rights reserved. Page 20
DL Grant and RB Problem Analysis – Multiple Users Impact
 Step 1: Check whether the problem is caused by too many user or not
 We can implement real time user static monitoring to check the current user number
Copyright © Huawei Technologies Co., Ltd. All rights reserved. Page 21
DL Grant and RB Problem Analysis – CCE Detection Failure &
Allocation Failure
 For CCE detection failure
 Method to check: Implement Cell DT test in U2020 to check whether there is CCE detection failure
 Possible causes:
 Poor DL coverage that cause UE fail to decode PDCCH, in this case, implement RF optimization
 CCE aggregation level is fixed configured: check NRDUCELLRSVDPARAM. RsvdU8Param7, the value should be 0,
which means CCE aggregation level is dynamic
 PDCCH IBLER target setting problem: Check NRDUCellPdcch.PdcchBlerTarget parameter, the value should be less
than 2%
– gNodeB will adjust PDCCH power to meet this target, if the value is too large, it will cause PDCCH demodulation failure
Copyright © Huawei Technologies Co., Ltd. All rights reserved. Page 22
DL Grant and RB Problem Analysis – CCE Detection Failure &
Allocation Failure (Cont.)
 For CCE allocation failure:
 Method to check: Implement CCE load monitoring in U2020, if the CCE load is very high, it may cause CCE
allocation failure
 Possible cause:
 Poor DL coverage that cause large CCE aggregation level allocation in the cell
 Two may users in the cell
 CCE ratio configuration problem: Check the NRDUCELLPDCCH. UlMaxCcePct, the proper ratio is 50%
Copyright © Huawei Technologies Co., Ltd. All rights reserved. Page 23
MCS Problem Related Parameters Analysis
Problem Scenario Possible cause Solution
MCS is fixed value 1. MCS is fixed configured
2. UE doesn’t report CSI, so gNodeB
will use fixed MCS4 for scheduling
1. Check NRDuCellRsvdParam.
RsvdU8Param68, if the value is
non-zero,that means DL MCS is
fixed configured
2. Poor SRS quality that cause CSI-
RS beamforming abnormal
MCS is very low after
handover
Initial MCS setting is too low Check NRDUCellPdsch. DlInitMcs, the
value should be more than 4
DL MCS can’t reach
maximum value any
time
TRS period is too large that cause
large frequency offset
NRDUCellCsirs. TrsPeriod, it should
not be more than 20ms
Copyright © Huawei Technologies Co., Ltd. All rights reserved. Page 24
RANK Problem Related Parameters
Problem Scenario Possible cause Relevant Parameters
Rank can’t reach
rank4
AAU channel calibration problem Manual execute channel calibration,
STR NRDUCELLCHNCALIB, if it still
failure, then check whether external
interference exists.
CSI-RS port number is less than 4 Check NRDUCellRsvdParam.
RsvdU8Param47, the value should be
equal or more than 2(port number
more than 4)
Maximum MIMO layer number is less
than 4
Check NRDUCELLPDSCH.
MaxMimoLayerNum parameter, the
value should be more than 4
Rank is low after
handover
Initial Rank setting is too low Check NRDuCellRsvdParam.
RsvdU8Param67,the value can be
increased if the coverage is good after
handover
Copyright © Huawei Technologies Co., Ltd. All rights reserved. Page 25
High IBLER Problem Related Parameters
Problem Scenario Possible cause Relevant Parameters
IBLER is higher than
10%
IBLER target is too large Check the NRDUCELLPDSCH.
DlTargetIbler parameter, the value can’t
exceed 10%
TRS period is too large, that
cause high BLER in mobility
environment
Check NRDUCELLCSIRS. TrsPeriod, the
value shouldn’t be exceed 40ms
PDSCH DMRS is not enough in
high mobility environment
Check NRDUCELLPDSCH.
DlAdditionalDmrsPos, we can set it to pos1
to increase DMRS resource
Downlink beamforming weigh is
fixed configured
SRS-PMI adaptive switch should be turned
on
Copyright © Huawei Technologies Co., Ltd. All rights reserved. Page 26
Summary
 NR radio peak throughput analysis and parameters setting
 Radio throughput problem isolation method
 MCS/BLER/RANK problem analysis and parameters
Thank You
www.huawei.com

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5G Radio Network Througput Problem Analysis HCIA.pdf

  • 1. www.huawei.com Copyright © Huawei Technologies Co., Ltd. All rights reserved. 5G Radio Network Throughput Problem Analysis
  • 2. Copyright © Huawei Technologies Co., Ltd. All rights reserved. Page 2 Objectives  Upon completion of this course, you will be able to:  Know the key factors for radio peak throughput calculation  Implement radio throughput problem isolation  Implement radio throughput problem optimization
  • 3. Copyright © Huawei Technologies Co., Ltd. All rights reserved. Page 3 Throughput Optimization Scenario  Peak throughput test problem: During the peak throughput test, UE can’t reach the target value  Related radio factors:  Channel environment is not ideal  Channel parameters are not optimal  Driver test throughput test problem: During the driver test, the average throughput can’t reach the target value  Related radio factors:  RF issues (Coverage, interference)  Abnormal event (Service drop, handover failure)  Improper parameters
  • 4. Copyright © Huawei Technologies Co., Ltd. All rights reserved. Page 4 Contents 1. NR Radio Peak Throughput Factor Analysis 2. NR Radio Throughput Problem Optimization
  • 5. Copyright © Huawei Technologies Co., Ltd. All rights reserved. Page 5 5G Radio Peak Throughput Analysis - Downlink
  • 6. Copyright © Huawei Technologies Co., Ltd. All rights reserved. Page 6 Key Parameters for DL Peak Throughput Description Advise to peak throughput achievement SSB period Indicate the SSB transmission period The period can be set largest to reduce SSB overhead, but it will increase access latency Sib1Period Indicate the SIB1 transmission period For SA, the period can be set largest to reduce SSB overhead, but it will increase access latency. For NSA, SIB1 can be disabled TRSperiod Indicate the TRS period The period can be set largest to reduce SSB overhead, for it will impact demodulation performance in mobility scenario DlDmrsType Indicate PDSCH DMRS type Type2 in recommended as it has less overhead, but the performance is worse than type1 DlDmrsMaxLength Indicate the PDSCH DMRS length 1 symbol is recommend for peak throughput scenario
  • 7. Copyright © Huawei Technologies Co., Ltd. All rights reserved. Page 7 Key Parameters for DL Peak Throughput (Cont.) Parameter Description Advise to peak throughput achievement DlAdditionDmrsPos Indicate the resource for additional PDSCH DMRS configuration For peak throughput scenario, it is recommend not use additional DMRS SSB rate match switch Indicate whether SSB rate matching switch is ON or OFF For peak throughput scenario, it is recommend to enable SSB rate match CSI-RS rate match switch Indicate whether CSI-RS rate matching switch is ON or OFF For peak throughput scenario, it is recommend to enable CSI-RS rate match TRS rate match switch Indicate whether TRS rate matching switch is ON or OFF For peak throughput scenario, it is recommend to disable TRS rate match PDCCH rate match Indicate whether PDCCH rate matching switch is ON or OFF For peak throughput scenario, it is recommend to enable CSI-RS rate match and also reduce the PDCCH RB number OccupiedSymbolNum Indicate the PDCCH symbol number in CORESET 1 symbol is recommended OccupiedRbNum Indicate the PDCCH RB number in CORESET We can reduce the PDCCH RB number, at least 24RB are required. Meanwhile, we should enable PDCCH rate match function
  • 8. Copyright © Huawei Technologies Co., Ltd. All rights reserved. Page 8 5G Radio Peak Throughput Analysis - Uplink
  • 9. Copyright © Huawei Technologies Co., Ltd. All rights reserved. Page 9 Key Parameters for UL Peak Throughput Parameter Description Advise to peak throughput achievement Format1Rbnumber/ Format3Rbnumber Indicate long format PUCCH RB nubmer Choose the least resource for PUCCH, it will impact access user number PRACHConfigurati onIndex Indicate time domain PRACH occasions Choose the index with the least PRACH occasion PUSCH Occupying PRACH switch Indicate the whether PUSCH can occupy PRACH resource We can enable the switch to increase peak throughput, but it will impact new UE random access
  • 10. Copyright © Huawei Technologies Co., Ltd. All rights reserved. Page 10 Channel Environment For Peak Throughput Test  Other remarks:  The distance between the terminal and the AAU must be greater than 20 m to avoid uplink power saturation  The downlink high Rank depends on the surrounding multipath environment. Try to select the area with reflection of surrounding trees and buildings and ensure the non-direct path between the test point and base station antenna. In the uplink performance test, the direct path environment is preferred and the test point with line of sight is the best location SSB RSRP SSB SINR N SSB RSRP Freq Offset CSI-RS RSRP CSI-RS SINR DMRS0~n SINR Requirement - 65dBm~- 75dBm >3dB The RSRP of the strongest neighboring cell is at least 6dB less than of the serving cell (-50,50) - 70dBm ~- 80dBm >30dB >30dB
  • 11. Copyright © Huawei Technologies Co., Ltd. All rights reserved. Page 11 Contents 1. NR Radio Peak Throughput Factor Analysis 2. NR Throughput Problem Optimization
  • 12. Copyright © Huawei Technologies Co., Ltd. All rights reserved. Page 12 E2E Data Transfer Architecture and Factors CPE gNodeB BBU eNodeB BBU Switch Router HSS MME/UGW Firewall APP Server 12. TCP windows/Thread/RTT Hardware performance 10. Transmission packet loss/bandwidth X2 11. QCI/AMBR 6. Alarm 7. Parameter 8. Channel calibration 9. Transmission packet loss 3. UE capacity RB/Modulation/Feature 1. TCP windows/Thread/RTT 2. Hardware performance 4. SINR/CQI/RI/SRS 5 Channel condition Factors 1, 2, 3, 6, 7, 9, 10, 11, and 12 affect the Grant and RB, and factors 4, 5, 6, 7, and 8 affect the MCS, BLER, and rank.
  • 13. Copyright © Huawei Technologies Co., Ltd. All rights reserved. Page 13 General Optimization Flow  Step1: Check if AMBR subscription rate is enough  Method: In NSA network, check the SgNB Addition Request message to find the subscription UE-AMBR  Step2: Check if cell status is normal, clean all the alarms that may impact data throughput
  • 14. Copyright © Huawei Technologies Co., Ltd. All rights reserved. Page 14 General Optimization Flow (Cont.)  Step 3: UE capability check  Supported bandwidth: Indicate the maximum bandwidth that supported by UE, for sub 6G, it should be 100MHz  MIMO layer number: For commercial UE, it should be 4 layers on downlink, and 2 layers on uplink  Modulation scheme: 256QAM should be supported
  • 15. Copyright © Huawei Technologies Co., Ltd. All rights reserved. Page 15 General Optimization Flow (Cont.)  UE SRS switching capability  If UE supports SRS antenna switching function, gNodeB could adopt SRS beaming weighting mechanism SRS  If UE doesn’t support antenna switching function, only PMI beamforming weight can be used which has worse performance than SRS weighting  UE ratemaching capability:  If UE doesn’t support rate matching, then rate matching function is not valid for the UE
  • 16. Copyright © Huawei Technologies Co., Ltd. All rights reserved. Page 16 The Common Problem for Radio Interface  Radio resource related problem: not enough resource for PDCCH or PDSCH  DL grant number is less: For 4:1 TDD slot configuration, the DL grant number per second should reach 1600 times  RB number is less:Allocation RB number is not enough  Radio environment related problem  Low MCS  Low rank  High PDSCH IBLER
  • 17. Copyright © Huawei Technologies Co., Ltd. All rights reserved. Page 17 Radio Interface Factors Analysis Downlink Key Indicator Breakdown Counter Name DL Grant/S PDSCH RB Num/Slot Avg DL MCS0/1 IBLER Avg DL Rank Peak Rate Standard 1600 times 100 MHz bandwidth: 267/slot 80 MHz bandwidth: 213/slot The difference in the actual Probe statistics: 1 RB to 2 RBs. 256QAM: 27 orders IBLER: 0% 2T4R: 4; 4T8R: 8 Reasonable Range in Non-Peak-Rate Scenarios 1500 to 1600 Theoretical value minus 4 RBs to 6 RBs N/A 9% to 12% N/A Observation Method 1. Probe log; 2. OMT log; 3. U2020 Common User monitoring Affecting Factor 1. AMBR rate limit; 2. Inappropriate PDCP and RLC parameters corresponding to QCI; 3. Multi-user scheduling; 4. Missing CCE detection or CCE allocation failure; 5. Scheduling failure (HARQ process exhausted); 1. AMBR rate limit 2. Multi-user scheduling; 3. Low RBs due to insufficient inbound traffic caused by TCP packet loss or disorder 1. Coverage and channel environment 2. Absence of CQI reporting because the CSI-RS is not measured, fixed MCS 4 order scheduling; 3. Parameter settings: CSI-RS port configuration, DMRS configuration, MCS configuration, IBLER adaptation; 4. Channel calibration failure 1. Parameter settings: SRS weight, DMRS configuration, and rank configuration; 2. Channel calibration 3. External interference SRS measurement; 4. SRS power 5. Rank adaptive algorithm; 6. Channel environment (NLOS and LOS)
  • 18. Copyright © Huawei Technologies Co., Ltd. All rights reserved. Page 18 Radio Relevant Parameter Monitor
  • 19. Copyright © Huawei Technologies Co., Ltd. All rights reserved. Page 19 DL Grant and RB Problem Analysis – Insufficient Ingress Traffic Isolation  If the inbound traffic is not enough (packet loss from server to gNodeB ), if will definitely impact the DL grant and RB number. So we can implement MAC padding test to exclude the ingress traffic problem  MAC padding function: gNodeB simulate the MAC layer PDU and transmit to particular UE. If the MAC padding result can’t reach the target data rate, that means the problem occurs on gNodeB side as well as radio interface
  • 20. Copyright © Huawei Technologies Co., Ltd. All rights reserved. Page 20 DL Grant and RB Problem Analysis – Multiple Users Impact  Step 1: Check whether the problem is caused by too many user or not  We can implement real time user static monitoring to check the current user number
  • 21. Copyright © Huawei Technologies Co., Ltd. All rights reserved. Page 21 DL Grant and RB Problem Analysis – CCE Detection Failure & Allocation Failure  For CCE detection failure  Method to check: Implement Cell DT test in U2020 to check whether there is CCE detection failure  Possible causes:  Poor DL coverage that cause UE fail to decode PDCCH, in this case, implement RF optimization  CCE aggregation level is fixed configured: check NRDUCELLRSVDPARAM. RsvdU8Param7, the value should be 0, which means CCE aggregation level is dynamic  PDCCH IBLER target setting problem: Check NRDUCellPdcch.PdcchBlerTarget parameter, the value should be less than 2% – gNodeB will adjust PDCCH power to meet this target, if the value is too large, it will cause PDCCH demodulation failure
  • 22. Copyright © Huawei Technologies Co., Ltd. All rights reserved. Page 22 DL Grant and RB Problem Analysis – CCE Detection Failure & Allocation Failure (Cont.)  For CCE allocation failure:  Method to check: Implement CCE load monitoring in U2020, if the CCE load is very high, it may cause CCE allocation failure  Possible cause:  Poor DL coverage that cause large CCE aggregation level allocation in the cell  Two may users in the cell  CCE ratio configuration problem: Check the NRDUCELLPDCCH. UlMaxCcePct, the proper ratio is 50%
  • 23. Copyright © Huawei Technologies Co., Ltd. All rights reserved. Page 23 MCS Problem Related Parameters Analysis Problem Scenario Possible cause Solution MCS is fixed value 1. MCS is fixed configured 2. UE doesn’t report CSI, so gNodeB will use fixed MCS4 for scheduling 1. Check NRDuCellRsvdParam. RsvdU8Param68, if the value is non-zero,that means DL MCS is fixed configured 2. Poor SRS quality that cause CSI- RS beamforming abnormal MCS is very low after handover Initial MCS setting is too low Check NRDUCellPdsch. DlInitMcs, the value should be more than 4 DL MCS can’t reach maximum value any time TRS period is too large that cause large frequency offset NRDUCellCsirs. TrsPeriod, it should not be more than 20ms
  • 24. Copyright © Huawei Technologies Co., Ltd. All rights reserved. Page 24 RANK Problem Related Parameters Problem Scenario Possible cause Relevant Parameters Rank can’t reach rank4 AAU channel calibration problem Manual execute channel calibration, STR NRDUCELLCHNCALIB, if it still failure, then check whether external interference exists. CSI-RS port number is less than 4 Check NRDUCellRsvdParam. RsvdU8Param47, the value should be equal or more than 2(port number more than 4) Maximum MIMO layer number is less than 4 Check NRDUCELLPDSCH. MaxMimoLayerNum parameter, the value should be more than 4 Rank is low after handover Initial Rank setting is too low Check NRDuCellRsvdParam. RsvdU8Param67,the value can be increased if the coverage is good after handover
  • 25. Copyright © Huawei Technologies Co., Ltd. All rights reserved. Page 25 High IBLER Problem Related Parameters Problem Scenario Possible cause Relevant Parameters IBLER is higher than 10% IBLER target is too large Check the NRDUCELLPDSCH. DlTargetIbler parameter, the value can’t exceed 10% TRS period is too large, that cause high BLER in mobility environment Check NRDUCELLCSIRS. TrsPeriod, the value shouldn’t be exceed 40ms PDSCH DMRS is not enough in high mobility environment Check NRDUCELLPDSCH. DlAdditionalDmrsPos, we can set it to pos1 to increase DMRS resource Downlink beamforming weigh is fixed configured SRS-PMI adaptive switch should be turned on
  • 26. Copyright © Huawei Technologies Co., Ltd. All rights reserved. Page 26 Summary  NR radio peak throughput analysis and parameters setting  Radio throughput problem isolation method  MCS/BLER/RANK problem analysis and parameters