Promotional Theme Slides of
LTE FDD 4T4R
2022.03
CONFIDENTIAL
Feature Principles and Gain Sources
Benefits of 4T4R
2T2R
2R UE
4T4R
4R UE
2R UE
UE
type
eNB
mode
Gain compare to eNB in 2T
mode
4R
4T4R
array gain, multiplexing gain,
diversity gain, and power gain
2R
4T4R
array gain, power gain,
and diversity gain
mTnR: indicates that the eNodeB uses m physical antennas for downlink transmission and n
physical antennas for uplink reception.
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· Power gain
If the power of each port remains same when changing from 2T to 4T, then
total power of the cell will be doubled. In noise-limited scenarios, the power
gain will increase the UE receiver SINR, to improve the signal quality.
· Diversity gain
Increasing the number of antennas reduces the probability of simultaneous
deep fading of signals from multiple antennas, improves the SINR stability at
the RX and the reliability of reception.
· Array gain
When the number of antennas increases, a strong directional radiation pattern
is generated on the same polarized antenna by using the strong correlation of
spatial channels and the principle of wave interference. The beam adaptively
points to the incoming direction of UEs, thereby improving the SINR and the
system capacity or coverage area, and reducing the interference between UEs.
The phase of each transmit antenna is adjusted through the PMI so that
signals arriving at the target UE are superimposed with same phase. This
enhances signals and obtains array gains.
·Multiplexing gain
The maximum number of data streams transmitted on the same time-frequency
resource increases from 2 to 4. This doubles the theoretical peak throughput.
DL axb MIMO indicates that the eNodeB is configured with a logical antenna port (cell-specific RS) for
downlink transmission, and the UE uses b receive antennas.
HUAWEI CONFIDENTIAL
Page 2
4T4R Deployment and Verification Checklist (1/4)
Scenario
Trial site
selection
Checklist
Trial site
selection
principle
Site solution
Feature
deployment
License
Baseline
parameter
Description
Remarks & Guidance Material
 ISD: The ISD cannot be excessively small. It is recommended that the ISD be greater than 500 m based on experience.
 Note: Check whether RRU
The recommended values are 2000 m and 400-600 m at typical sites in Canada and Mexico, respectively.
power can be doubled for 4T4R
 Load: The PRB usage cannot be excessively low. It is recommended that the downlink PRB usage be greater than or
deployment. If it cannot,
equal to 10%, and a value higher than 30% is preferred.
preferentially reduce RS power
 Site range: Two circles of sites around a center cell are selected. (Eight to ten sites are recommended.)
and adjust the camping policy.
 Stable traffic: It is recommended that cells with stable user quantity, traffic, and rate for a long be selected.. The traffic
For details, see baseline
fluctuates greatly, which makes it difficult to evaluate gains.
configurations of
 RSRP-based UE mobility policy: After 4T4R is reconstructed, the RSRQ deteriorates. If RSRQ-based handovers are
4T4Rparamters.
used, the UE distribution changes. 4G-3G handover-reselection policy and 4G intra-frequency inter-frequency handoverreselection policy must be set to RSRP-based.
 For details, see Site Solution.
 Site solution confirmation: Confirm and record the change of key engineering information, including the software version,  4T traffic statistics (counterlist)
models of RRUs and BBPs, optical module rate, cable length from an RRU to the antenna system, PAs and TMAs, and
template.(Both XML counterlist
electrical downtilt of integrated antennas.
files are required.)
 After the site solution is implemented, take photos from different directions. Ensure antenna ports and RRU ports are
clearly photographed.
 Ensure that the coverage remains unchanged before and after the reconstruction, and record engineering parameters,
configurations, one-click logs, and common traffic statistics before and after the reconstruction.
 The feature license, hardware license, and power license are required.
 For details, see License.




 For details, see Parameter
Baselines.
Set TxRxMode to 4T4R, set CrsPortNum to 4；.
Set MimoAdaptiveSwitch to CL_ADAPTIVE.
Port mapping: Set CrsPortMap to 4T4P_0321 for an integrated RF module and 4T4P_0213 for combined RF modules.)
For other parameters, see parameter baselines.
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HUAWEI CONFIDENTIAL
Page 3
4T4R Deployment and Verification Checklist (2/4)
Scenario
Checklist
Remarks & Guidance Material
4x2 vs. 2x2
 Traffic statistics rate gains: The gains are related to the downlink PRB usage. The higher the PRB usage, the
greater the gains. For details, see the gain specifications..
4x4 vs. 2x2
 Downlink peak rate: 100%
Gain
Recommended
test UE
Test time
Gain
verification
Description
 2x2 theoretical peak throughput:
20 MHz BW : 148.695 Mbit/s
10 MHz BW :72.138 Mbit/s
For details, see Expected DT Gains.
 4x2: 2R-capable UEs;
 4x4: Flagship phones such as P40 and Mate40;
 Comparison tests must be conducted in the same time segment, ensuring similar PRB usages and reducing
impacts of background users.
 The PRB usages before and after the test should be within the range of 10%-30%. The higher the PRB usage, the
higher the traffic gain.
Test route

Test tool and
content


Verification of 4x2
gain vs. 2x2 gain 

Verification of 4x4
gain vs. 2x2 gain 
 The test route must be consistent
for two tests.
The test UE positions and test routes must be consistent for two tests.
 You are advised to geographically
average the DT data.
FileZilla test software is recommended. FTP full packet injection tests with download or upload using five threads or
 Peak Throughput refer to: Peak
more need to be performed. Logs are collected using the Probe.
Throughput Testing
Fixed point test: Select a middle-far point (RSRP < –100 dBm) for full packet injection tests, obtaining single-user
throughput gains.
DT: The test route (covering the middle-far point) must be consistent for two tests. Observe the RSRP and Thp/DL
GRANT/RB gains.
Fixed point test: Select a middle-far point (RSRP < –100 dBm) for full packet injection tests, obtaining single-user
throughput gains.
DT: The test route (covering the middle-far point) must be consistent for two tests. Observe the RSRP and Thp/DL
GRANT/RB gains.
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Page 4
4T4R Deployment and Verification Checklist (3/4)
Scenario
Known issue
check
Checklist
Remarks & Guidance
Material
Description
Feature activation check:
 Check whether the antenna channel connection mode is consistent with the recommended one.
 Check whether the antenna system has TMAs, PAs, or combiners.
The peak rate does not
 Use the U2020 to collect four-channel RSSI data and transmit power to check whether 4T4R takes effect.
meet the expectation.
 Verify the RSSI and RET to check channel connection accuracy and electrical downtilt consistency.
 For details about parameter check, see Parameter Baselines.
 For details about peak rate test guidance, see 4x4 Peak Rate Testing.
 Feature Activation
Confirmation
 Antenna Connection
Sequence Confirmation
 Parameter Baselines
 4x4 Peak Rate Testing
Feature activation check:
 Check whether the antenna channel connection mode is consistent with the recommended one.
 Check whether the antenna system has TMAs, PAs, or combiners.
 Use the U2020 to collect four-channel RSSI data and transmit power to check whether 4T4R takes effect.
 Verify the RSSI and RET to check channel connection accuracy and electrical downtilt consistency.
The DT gain does not For details about parameter check, see Parameter Baselines.
meet the expectation. DT check:
Test the peak rate at the cell center (RSRP > –75 dBm and SINR > 25). Ensure the test UE, SIM card,
transmission, and PC are proper.
Perform the test in off-peak hours to eliminate impacts of background users.
Identify and analyze main causes of insufficient DT gains (RSRP/SINR/MCS/DL GRANT/RB/Rank 2
proportion).
 Feature Activation
Confirmation
 Antenna Connection
Sequence Confirmation
 Parameter Baselines
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HUAWEI CONFIDENTIAL
Page 5
4T4R Deployment and Verification Checklist (4/4)
Scenario
Checklist
Remarks & Guidance
Material
Description
The traffic gain does not
meet the expectation.

Feature activation check:

Check whether the antenna channel connection mode is consistent with the recommended one.

Check whether the antenna system has TMAs, PAs, or combiners.

Use the U2020 to collect four-channel RSSI data and transmit power to check whether 4T4R takes effect.

Verify the RSSI and RET to check channel connection accuracy and electrical downtilt consistency.
For details about parameter check, see Parameter Baselines.
Traffic gain analysis:

Check user distribution. If most users are distributed at the cell center, the traffic gain may be small.

Identify and analyze main causes of insufficient traffic gains (CQI/RB/MCS/Rank 2 proportion).
 Feature Activation
Confirmation
 Antenna Connection
Sequence Confirmation
 Parameter Baselines
KPIs deteriorate.

Feature activation check:
Check whether the antenna channel connection mode is consistent with the recommended one.
Check whether the antenna system has TMAs, PAs, or combiners.
Use the U2020 to collect four-channel RSSI data and transmit power to check whether 4T4R takes effect.
Verify the RSSI and RET to check channel connection accuracy and electrical downtilt consistency.

For details about parameter check, see Parameter Baselines.

KPI deterioration after 4T4R activation is mainly caused by UE compatibility problems. For details, see the
UE compatibility problem list. Submit a trouble ticket to seek help from R&D engineers if necessary.
 Feature Activation
Confirmation
 Antenna Connection
Sequence Confirmation
 Parameter Baselines
Known
issue
check
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HUAWEI CONFIDENTIAL
Page 6
Site Solution: eNodeB Software and Hardware Confirmation
Software Version
Integrated RRUs
require eNodeBs
running an eRAN8.1
or later version.
•RRU combination
modules require
eNodeBs running an
eRAN11.1SPC230
(SRAN11.1SPC230) or
later version.
•
RRU Requirement
Integrated AAUs or RRUs are
preferred.
BBU Requirement
UBBPd2/4/5/6
UBBPe
UBBPg
If two RRUs combine, the RRUs
module must be same.
Check whether the BBP supports 4T.
For details, visit the following URL :
https://info.support.huawei.com/wireless/
wirelessnew/index.html#/global/zh/G13/BBU/
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HUAWEI CONFIDENTIAL
Optical Module Requirement
Integrated AAUs or RRUs
 Each cell is configured with a pair of
optical fibers and two optical modules.
20 MHz and 10 MHz bandwidths
require 4.9 Gbit/s and 2.5 Gbit/s
optical modules respectively, in the
normal scenario.
RRU combination networking
 Each cell is configured with two pairs
of optical fibers.
 Both CRPI cascading topology (three
optical modules for each cell) and
CPRI star topology are supported (four
optical modules for each cell).
 The cascading topology saves slots on
the BBP, but requires an optical
module rate twice that of the star
topology.
Page 7
Site Solution: Antenna System Confirmation
Antenna Requirement
Integrated fourPhysical antenna
port antenna combination * Supported
Recommended
≤1M
Feeder Requirement
-45°
Two rows of
antennas are
horizontally
placed.
1 m: The horizontal space is
less than 1 m.
 0.1 m: The vertical height
difference is less than 0.1 m.
 0.5°: The downtilt difference is
less than 0.5°
 0.5°: The horizontal azimuth
difference is less than 0.5°
•
Antenna combination is not recommended due to the
engineering difficulty is high but the 4T4R
Agisson antenna: APE4517R0
yyLB < >
corresponding
antenna layout
Supported
bands
-45° +45°
Antenna

A
C
D
B
Integrated 4T4R
RRU
-45°
+45°
-45° +45°
Antenna
TRX A
•
+45°

Integrated four-port antenna
(vertical part of the two rows of
antennas)
Integrated module networking:
support, but with decreased 4T
performance (especially at the cell
edge)
RRU combination networking: not
supported
Antenna Identification
Integrated AAUs or combined RRUs
• 1 m: The feeder length difference must be
less than 1 m.
• 1 dB: The feeder loss difference must be
less than 1 dB.
• Sequence: Install the feeder between the
RRU ports and antenna ports in the
following sequences:
Integrated AAUs: +-+- ACDB
Combined RRUs: +-+- ABAB
Back
TRX B
2T2R RRU-1
TRX A
TRX B
2T2R RRU-2
Determine the internal layout based on antenna specification documentation.
 For some antennas, the layout diagram is provided, as shown in the right figure.
For antennas whose layout diagrams are not provided:
 If the antenna height is less than or equal to 1.5 m or the width is greater than or
equal to 0.3 m, the probability of horizontal layout is high.
 If the antenna height is greater than 1.5 m or the width is less than 0.3 m, antennas
may be vertically placed.
 Huawei Agisson antenna identification
 T: top, B: bottom, L: left, R: right
 LT+RT or LB+RB indicates horizontally placed antennas. LT+LB or RT+RB
indicates vertically placed antennas.
 Four multi-port antennas, you are advised to connect those horizontally
arranged in two rows.
For example, as shown in the figure above, connect yLT and yyyRT or yyLB and
yyyyRB.
performance is not the optimal.
A 4T antenna generally has two electrical downtilts.
Ensure
thatTECHNOLOGIES
both electrical downtilts
consistent
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CO., are
LTD.
with the setting before the reconstruction.
HUAWEI CONFIDENTIAL
Page 8
Site Solution: Inter-Cell Cross Feeder Connection Detection
Small Cross Feeder Connection
XX
A
Intra-cell line sequence Errors
XX
XX
Big Cross Feeder Connection
XX
XX
XX
XX
XX
XX
XX
XX
XX
XX
XX
XX
XX
XX
XX
C
D
R
R
U
1
B
A
C
D
B
R
R
U
2
A
C
D
R
R
U
1
B
A
C
D
R
R
U
2
B
A
C
D
B
R
R
U
1
A
C
D
R
R
U
2
B
·Small Cross Feeder Connection essentially results antenna
coverage of a physical cell is inconsistent. UEs and antennas are
unaware of this problem, which greatly affects network
performance.If the cable sequence detects obvious imbalance
between channels in the cell, you are advised to perform
rectification on site in time.
·The intra-cell line sequence problem is essentially caused by the
non-optimal connection of the CRSPORTMAP mapping and line
sequence in the cell. The impact on the performance is only about
5%. You can check the channel line sequence and configure the
optimal CRSPORTMAP value.
· The Big Cross Feeder Connection is essentially caused by the
planned antenna connection inconsistent with the actual antenna
connection. The impact on the performance is related to the planning
and coverage. Therefore, you need to check the cell handover
relationship and drive tests.
RSSI-based offline wire sequence detection (inventory)： If the detection results of different channels are
significantly unbalanced, for example, if the electrical downtilt configuration is consistent, It may be Small Cross Feeder Connection.
In this case, check onsite or use the InterCrossLogCheck tool for further confirmation.
If the RSSI detection results of channels A/B
and C/D are significantly unbalanced, then it is
suspected that Cross Feeder issue exists
between different cells, one sector RRU ports
are connected to antennas from different
sectors. Also we can check whether channel
detection imbalance occurs on intra-frequency
neighboring cells. If even number of cells are
unbalanced, then there is a high probability
that Cross Feeder Connection issue occurs.
Otherwise, the problem may be caused by
other engineering issue. On site check and
rectification are recommended for suspected
connection issues.
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Page 9
Site Solution: Antenna Connection Sequence Confirmation
 Antenna connection solution and CRS_PORT mapping
Back
 RSSI-based cable sequence detection: The U2020 traces the RSSI of four channels of a
single cell. The tracing result indicates that channels A and D (No.0 and No.3 channels), as
well as channels B and C (No.1 and No.2 channels), has the strongest relevancy.
Integrated RRU
Antenna port
+
-
+
-
RRU port
A
C
D
B
Baseband sequence
0
2
1
3
CRS_PORT mapping: ABCD<-->0321
RRU combination
Antenna port
+
-
+
-
RRU port
A
B
A
B
Baseband sequence
0
2
1
3
CRS_PORT mapping: ABAB<-->0213
RRU ports
A B C
ANT0, ANT1, ANT2, and
ANT3 represent RRU ports A,
B, C, D, respectively.
D
The key point is that baseband ports 0 and 1 for
transmitting pilot signals map onto antenna ports of the
same polarity.
A value close to 1 indicates
strong relevancy.
AAU
CRS_PORT mapping does not need to be configured.
The default value is optimal.
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Note: If the relevancy of channels A and D, as well as B and C is not the strongest, the RRU and
antenna may not be connected in correct order. Then it is advised to contact R&D engineers
for analysis and CRS_PORT mapping reconfiguration.
HUAWEI CONFIDENTIAL
Page 10
Wire Sequence Check Method
No abnormal alarms, but no
gains or negative gains are
generated in traffic statistics
after 4T4R is deployed.
RSSI check
Normal
Antenna engineering
(connection, azimuth
and tilt) shall be normal
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abnormal
The absolute value of
two pairs is greater than
0.5, and the strongest
pairwise correlation can
be determined.
Absolute
value of two
pairs < 0.5
Adjust CRSPROT to
prevent this problem.
Check whether the
two electrical downtilt
configurations of the
antenna are consistent.
HUAWEI CONFIDENTIAL
Load the PIM tool or
simulation tool to eliminate
intermodulation interference.
(If there is a TMA, check
whether the attenuation of the
TMA is properly configured)
Page 11
Use InterCrossLogCheck
tool to check Cross Feeder
Connection between
sectors. If yes, go to the
site to check the antenna
feeder connection and the
connection sequence
between the optical fiber
and the baseband
processing unit.
Confirmation of Two Electrical Downtilts (1/2)
 Background: Basically, a 4T antenna has two logical electrical downtilts, indicated by RET1 and RET2 as below left figure.
 Typical issue in projects is that one electrical downtilt is not configured (then the default value takes effect.). As a result,
RSSIs of four channels are not balanced, affecting feature gain.
Single-cell four channel RSSI tracing
-75
1
RET1 beam
2
3
4
5
6
7
8
9
10 11 12 13 14 15 16 17 18 19
-80
-85
-90
-95
-100
-105
antenna 0 RSSI (dBm) Only
antenna
1 RSSI (dBm)
one electrical
downtilt is
As a(dBm)
result, the RSSI of
antenna 2 RSSI (dBm) configured.
antenna 3 RSSI
two channels is about 10 dB lower
than that of the other two channels.
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Page 12
Confirmation of Two Electrical Downtilts (2/2)
Method of confirming an antenna electrical downtilt (taking Huawei
antennas as an example)
1. SCN ALD: Ensure all RCUs can be scanned, both electrical downtilts are configured, and electrical
downtilts of the same antenna are same.
Method of adding a RET device (taking Huawei
antennas as an example)
1. Run the following command to add an RET device:
ADD RET: DEVICENO=3, CTRLCN=0, CTRLSRN=60,
CTRLSN=0, RETTYPE=SINGLE_RET,
SCENARIO=DAISY_CHAIN, VENDORCODE="HW",
SERIALNO="M1869FA08NS673bbR"; //M1869FA08NS673bbR
needs to be replaced based on SCN ALD command outputs.
2. Run the following command to calibrate the newly added
RET device:
CLB RET: OPMODE=SUBUNIT, DEVICENO=3, SUBUNITNO=1;
3. Run the following command to configure the electrical
downtilt of the newly added RET device:
2. DSP RETSUBUNIT： Check the configured electrical downtilt.
MOD RETSUBUNIT: DEVICENO=3, SUBUNITNO=1, TILT=70,
AER=5;
Device Name in the check result needs to be confirmed by the network planning personnel.
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Page 13
License


Feature ID
Feature Name
License Description
NE
Sales Unit
Feature license
LOFD-001001
DL 2×2 MIMO
DL 2x2 MIMO (FDD)<0}
eNodeB
Per Cell

LOFD-001003
DL 4×2 MIMO
DL 4x2 MIMO (FDD)
eNodeB
Per Cell
LOFD-001060
DL 4×4 MIMO
DL 4x2 MIMO (FDD)
eNodeB
Per Cell
LOFD-001005
UL 4-Antenna Receive Diversity
UL 4-Antenna Receive Diversity(FDD)
eNodeB
Per Cell
Hardware license




To enable the 4T4R 4Port feature (TxRxMode=4T4R,
CrsPortNum=4), all four licenses on the right are required.
The hardware license is needed based on configurations.
Ensure each 4T4R cell has 4 baseband TX and 4 baseband RX
channels.（2 TX/RX channels per cell will be configured by BBP
by default）
Ensure each TX and RX port of each RF module has a
corresponding TX or RX license. Otherwise, MIMO cells cannot
be activated. (two RF TX/RX channels licenses configured per
RF module by default)
Power license


For details about MIMO power configurations, see LTE FDD
eRAN11.1 Multi-Antenna Solution Integration and Optimization
Guide. 4T power can be twice or the same as 2T power. It is
recommended that the TX power of each 4T channel be the
same as that for 2T channel, simplifying network planning and
optimization. In this case, the total 4T power is twice of the total
2T power.
If the total power is doubled, the power license must be matched.
License Control
License
Item Name
Control Item ID
BB Transmit
Channel(FDD)
LT1S00BBTC00
RF Transmit
Channel(FDD)
LT1S00RFTC00
RF Transmit
Channel for Blade LT1S00RFTC01
and AAU (FDD)
BB Receive
Channel(FDD)
LT1S00BBRC00
RF Receive
Channel(FDD)
LT1S00RFRC00
RF Receive
Channel for
LT1S00RFRC01
Blade&AAU (FDD)
RF Output
Power(FDD)
LT1S0000PA00
RF Output Power
for
LT1S0000PA01
Blade&AAU(FDD)
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Quantity
Default capacity: two baseband TX channels per cell on each BBP
Licensing principles: One license unit is required for each baseband TX channel except for the two default baseband TX channels
per cell.
Total capacity: Number of baseband TX channels provided by an eNodeB = Number of cells served by the eNodeB x 2 + Number of
purchased license units
Default capacity: two RF TX channels per RF module
Licensing principles: One license unit is required for each RF TX channel except for the two default RF TX channels per RF module.
Total capacity: Number of RF TX channels provided by an eNodeB = Number of RF modules x 2 + Number of purchased license
units
Default capacity: two RF TX channels per RF module
Licensing principles: One license unit is required for each RF TX channel except for the two default RF TX channels per RF module.
Total capacity: Number of RF TX channels provided by an eNodeB = Number of RF modules x 2 + Number of purchased license
units
Default capacity: two baseband RX channels per cell on each BBP
Licensing principles: One license unit is required for each baseband RX channel except for the two default baseband RX channels
per cell.
Total capacity: Number of baseband RX channels provided by an eNodeB = Number of cells served by the eNodeB x 2 + Number of
purchased license units
Default capacity: two RF RX channels per RF module
Licensing principles: One license unit is required for each RF RX channel except for the two default RF RX channels per RF module.
Total capacity: Number of RF RX channels provided by an eNodeB = Number of RF modules x 2 + Number of purchased license
units
Default capacity: two RF RX channels per RF module
Licensing principles: One license unit is required for each RF RX channel except for the two default RF RX channels per RF module.
Total capacity: Number of RF RX channels provided by an eNodeB = Number of RF modules x 2 + Number of purchased license
units
Default capacity: 20 W per RF module
Licensing principles: RF power is licensed in units of 20 W. One license unit is required for every 20 W except for the default 20 W
power per RF module.
The number of license units to be purchased for a cell is determined by the cell power.
Total capacity: Maximum power of an eNodeB = (Number of RF modules + Number of purchased license units) x 20 W
Default capacity: 20 W per RF module
Licensing principles: RF power is licensed in units of 20 W. One license unit is required for every 20 W except for the default 20 W
power per RF module.
The number of license units to be purchased for a cell is determined by the cell power.
Total capacity: Maximum power of an eNodeB = (Number of RF modules + Number of purchased license units) x 20 W
Page 14
Parameter Baselines
Type
SubType
Parameter Name
Parameter ID Default Value
ADAPTIVE_MIMO_TYP MimoAdaptiveS OL_ADAPTIV
E
witch
E
ADAPTIVE
Recommended Value for MIMO Deployment
Mandatory/Optional
CL_ADAPTIVE
Mandatory
ADAPTIVE
Mandatory
INITIAL_MIMO_TYPE
InitialMimoType
SW_MAX_SM_RANK
For a four-antenna eNodeB, if 4x2 MIMO is used, the
MaxMimoRankP SW_MAX_SM value SW_MAX_SM_RANK_2 is recommended. If 4x4
ara
_RANK_2
MIMO is used, the value SW_MAX_SM_RANK_4 is
recommended.
Mandatory
Reference signal power
ReferenceSignal
Pwr
Pb
Pb
PA for even power
distribution
PaPcOff
Remarks
MML Script
The IBLER will increase if this parameter is set to
CL_ADAPTIVE(CL_ADAPTIVE) and downlink
frequency-selective scheduling is enabled at the MOD CELLMIMOPARACFG: LocalCellId=0,
MimoAdaptiveSwitch=CL_ADAPTIVE, InitialMimoType=ADAPTIVE;
same time.
MOD CELLALGOSWITCH: LocalCellId=0,
DlSchSwitch=FreqSelSwitch-0
MIMO mode
configuration
MOD CELLDLSCHALGO: LocalCellId=0,
MaxMimoRankPara=SW_MAX_SM_RANK_4;
Basic
Power
configuration
Lower the RBLER Reserved parameter
Same as the value on the original network
Mandatory
1
Same as the value on the original network
Mandatory
DB_3_P_A(-3
dB)
Same as the value on the original network
Mandatory
0
RsvdSwPara3_bit6-1
Mandatory
This parameter will become a default parameter
MOD ENBCELLRSVDPARA: LocalCellId=1,
after eRAN12.0 to resolve RBLER increases due
RsvdSwPara3=RsvdSwPara3_bit6-1;
to 4T deployment.
MOD PDSCHCFG: LocalCellId=X, ReferenceSignalPwr=182, Pb=0;
Contact R&D engineers if power is insufficient.
MOD CELLDLPCPDSCHPA: LocalCellId=X, PaPcOff=DB0_P_A;
Whether UEs of
category 6 and above
support four-layer
MIMO based on
TM3/TM4
Tm3Tm4Max4L
ayerCtrlSwitch
OFF
ON
Mandatory
If this switch is turned on, UEs of category 6 and
MOD ENODEBALGOSWITCH:
above support four-layer MIMO based on
CompatibilityCtrlSwitch=Tm3Tm4Max4LayerCtrlSwitch-1;
TM3/TM4.
RF module
combination
scenario
Joint Channel
Calibration Switch
TxChnCalSwitch
OFF
ON(On) for 4T4R and 4T8R cells
Mandatory
This parameter is introduced in a version later
than eRAN11.0.
RF module
combination
scenario
Joint Channel
Calibration Time
TxChnCalTime
3:00
0.125
Mandatory
This parameter is introduced in a version later
than eRAN11.0. (Perform calibration during offpeak hours based on live network conditions.)
RF module
combination
scenario
Joint Channel
Calibration Period
TxChnCalPeriod
48
48
Mandatory
This parameter is introduced in a version later
than eRAN11.0. (Perform calibration during offpeak hours in the unit of 0.5 hour.)
Compatibility
control switch
RF module
combination
(related to
4T
deployment)
RsvdSwPara3
182
MOD RRUJOINTCALPARACFG: LocalCellId=X,
TxChnCalSwitch=ON, TxChnCalTime=03&00&00,
TxChnCalPeriod=48;
This table is for reference only.
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Page 15
4T4R Deployment Script Example
4T4R on newly deployed networks (integrated RRU)
ADD SECTOR: SECTORID=0, ANTNUM=4, ANT1CN=0,
ANT1SRN=70, ANT1SN=0, ANT1N=R0A, ANT2CN=0,
SECTOR
ANT2SRN=70, ANT2SN=0, ANT2N=R0B, ANT3CN=0,
Configure
ANT3SRN=70, ANT3SN=0, ANT3N=R0C, ANT4CN=0,
ANT4SRN=70, ANT4SN=0, ANT4N=R0D,
CREATESECTOREQM=FALSE;
ADD SECTOREQM: SECTOREQMID=0, SECTORID=0,
ANTNUM=4, ANT1CN=0, ANT1SRN=70, ANT1SN=0,
ANT1N=R0A, ANTTYPE1=RXTX_MODE, ANT2CN=0,
SECTOREQM ANT2SRN=70, ANT2SN=0, ANT2N=R0B,
Configure
ANTTYPE2=RXTX_MODE, ANT3CN=0, ANT3SRN=70,
ANT3SN=0, ANT3N=R0C, ANTTYPE3=RXTX_MODE,
ANT4CN=0, ANT4SRN=70, ANT4SN=0, ANT4N=R0D,
ANTTYPE4=RXTX_MODE;
ADD CELL: LocalCellId=0, CellName="4t4r",
FreqBand=3, UlEarfcnCfgInd=NOT_CFG,
DlEarfcn=1750, UlBandWidth=CELL_BW_N100,
DlBandWidth=CELL_BW_N100, CellId=0,
PhyCellId=160, FddTddInd=CELL_FDD,
RootSequenceIdx=0,
Cell Configure
CustomizedBandWidthCfgInd=NOT_CFG,
EmergencyAreaIdCfgInd=NOT_CFG,
UePowerMaxCfgInd=NOT_CFG,
MultiRruCellFlag=BOOLEAN_FALSE,
CrsPortNum=CRS_PORT_4, TxRxMode=4T4R,
CrsPortMap=4T4P_0321;
ADD EUCELLSECTOREQM: LocalCellId=0,
Cell-sector
SectorEqmId=0;
association
Max MIMO
MOD CELLDLSCHALGO:
Multiplexing
LocalCellId=0,MaxMimoRankPara=SW_MAX_SM_RANK
Layers configure _4;
Fixed
MOD CELLMIMOPARACFG: LocalCellId=0,
Transmission
MimoAdaptiveSwitch=CL_ADAPTIVE,
Mode configure InitialMimoType=ADAPTIVE;
MOD ENODEBALGOSWITCH:
UEs of Cat6 and
COMPATIBILITYCTRLSWITCH=Tm3Tm4Max4LayerCtrl
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TECHNOLOGIES
CO., LTD.
later support 4x4
Switch-1;
2T2R-->4T4R(combined RRUs)
Cell
Deactivating
2T4R4T4R(integrated RRU)
DEA CELL: LocalCellId=0;
MOD SECTOR: SECTORID=0,
OPMODE=ADD, ANTNUM=2,
SECTOR
ANT1CN=0, ANT1SRN=71, ANT1SN=0,
Configure
ANT1N=R0A, ANT2CN=0,
ANT2SRN=71, ANT2SN=0,
ANT2N=R0B;
MOD SECTOREQM:
SECTOREQMID=0, OPMODE=ADD,
ANTNUM=2, ANT1CN=0,
ANT1SRN=71, ANT1SN=0,
SECTOREQM
ANT1N=R0A,
Configure
ANTTYPE1=RXTX_MODE, ANT2CN=0,
ANT2SRN=71, ANT2SN=0,
ANT2N=R0B,
ANTTYPE2=RXTX_MODE;
MOD CELL: LocalCellId=0,
CrsPortNum=CRS_PORT_4,
Cell Configure
TxRxMode=4T4R,
CrsPortMap=4T4P_0213;
Max MIMO
MOD CELLDLSCHALGO:
Multiplexing
LocalCellId=0,MaxMimoRankPara=SW_
Layers
MAX_SM_RANK_4;
configure
Fixed
MOD CELLMIMOPARACFG:
Transmission LocalCellId=0,
Mode
MimoAdaptiveSwitch=CL_ADAPTIVE,
configure
InitialMimoType=ADAPTIVE;
UEs of Cat6 MOD ENODEBALGOSWITCH:
and later
COMPATIBILITYCTRLSWITCH=Tm3Tm
support 4x4 4Max4LayerCtrlSwitch-1;
HUAWEI CONFIDENTIAL
Turn on Tx
Ch MOD RRUJOINTCALPARACFG:
Calibration Sw LocalCellId=0, TxChnCalSwitch=ON,
Cell
Deactivating
DEA CELL: LocalCellId=0;
MOD SECTOREQM: SECTOREQMID=0,
OPMODE=DELETE, ANTNUM=2,
SECTOREQM
ANT1CN=0, ANT1SRN=70, ANT1SN=0,
delete
ANT1N=R0C, ANT2CN=0, ANT2SRN=70,
ANT2SN=0, ANT2N=R0D;
MOD SECTOREQM: SECTOREQMID=0,
OPMODE=ADD, ANTNUM=2, ANT1CN=0,
SECTOREQM ANT1SRN=70, ANT1SN=0, ANT1N=R0C,
Configure
ANTTYPE1=RXTX_MODE, ANT2CN=0,
ANT2SRN=70, ANT2SN=0, ANT2N=R0D,
ANTTYPE2=RXTX_MODE;
MOD CELL: LocalCellId=0,
Cell Configure CrsPortNum=CRS_PORT_4,
TxRxMode=4T4R, CrsPortMap=4T4P_0321;
Max MIMO
MOD CELLDLSCHALGO:
Multiplexing
LocalCellId=0,MaxMimoRankPara=SW_MAX
Layers
_SM_RANK_4;
configure
Fixed
MOD CELLMIMOPARACFG: LocalCellId=0,
Transmission
MimoAdaptiveSwitch=CL_ADAPTIVE,
Mode
InitialMimoType=ADAPTIVE;
configure
UEs of Cat6 MOD ENODEBALGOSWITCH:
and later
COMPATIBILITYCTRLSWITCH=Tm3Tm4Ma
support 4x4
x4LayerCtrlSwitch-1;
Cell Activate ACT CELL: LocalCellId=0;
Page 16
Rollback Script Example
4T4R  2T4R
4T4R  2T2R

DEA CELL: LocalCellId=0;

DEA CELL: LocalCellId=0;

MOD SECTOREQM: SECTOREQMID=0,
OPMODE=DELETE, ANTNUM=2, ANT1CN=0,
ANT1SRN=60, ANT1SN=0, ANT1N=R0C, ANT2CN=0,
ANT2SRN=60, ANT2SN=0, ANT2N=R0D;

MOD SECTOREQM: SECTOREQMID=0,
OPMODE=DELETE, ANTNUM=2, ANT1CN=0,
ANT1SRN=60, ANT1SN=0, ANT1N=R0C, ANT2CN=0,
ANT2SRN=60, ANT2SN=0, ANT2N=R0D;

MOD SECTOREQM: SECTOREQMID=0, OPMODE=ADD,
ANTNUM=2, ANT1CN=0, ANT1SRN=60, ANT1SN=0,
ANT1N=R0C, ANTTYPE1=RX_MODE, ANT2CN=0,
ANT2SRN=60, ANT2SN=0, ANT2N=R0D,
ANTTYPE2=RX_MODE;

MOD CELL: LocalCellId=0, TxRxMode=2T2R,
CrsPortNum=CRS_PORT_2;

MOD CELLMIMOPARACFG: LocalCellId=0,
MimoAdaptiveSwitch=OL_ADAPTIVE;

ACT CELL: LocalCellId=0;

MOD CELL: LocalCellId=0, TxRxMode=2T4R,
CrsPortNum=CRS_PORT_2;

MOD CELLMIMOPARACFG: LocalCellId=0,
MimoAdaptiveSwitch=OL_ADAPTIVE;

ACT CELL: LocalCellId=0;
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Page 17
Single-Channel Power Decrease Optimization Parameters

As indicated by the following table, if the power cannot be doubled, 4T4R deployment will certainly lead to a single-channel power decrease. In this case, RS power is
preferentially reduced, and Pa and Pb remain unchanged.
RRU Model on the
Live Network
Band/Bandwidth of the
Live Network
Total Power/Power Used by
Current Frequencies
4T RRU Model/Power
Can 4T RRU Power Be
Doubled?
4T Deployment Policy
RRU3626
L1800/20 MHz
2 x 60 W/2 x 40 W
R3971/4 x 40 W
Y
RS power, Pa, and Pb remain unchanged.
RRU3626
L1800/20 MHz
2 x 60 W/2 x 60 W
R3971/4 x 40 W
N
RS power decreases. Pa and Pb remain unchanged.
 To maximally reduce user deregisteration due to RS power decreases:




MML Command
Change cell camping and handover (inter-frequency/inter-RAT A1 and A2) thresholds.
Change the reselection threshold for UEs on another network to reselect the original cell. CELLRESEL
Change the A4 event threshold for inter-frequency neighboring cells of a 4T cell.
Change the intra-frequency handover parameter CIO to increase the difficulty of
EUTRANINTERNFREQ
handovers from a 4T cell with decreased pilot power to neighboring 2T cells and
decrease the difficulty of handovers from neighboring 2T cells to the 4T cell. The
adjustment equals the decreased pilot power strength.
 Negative impacts:


When the intra-frequency CIO is changed, the CIO of the current site and neighboring
cells is changed simultaneously. In this case, you need to manually confirm neighbor
relationships, which is difficult.
Decreasing camping, handover, reselection handovers slightly decreases the average
RSRP in a cell. As a result, control-plane indicators (access, handover, call drop, and
reestablishment) slightly deteriorate.
INTERFREQHOGROUP
 Batch operation guide: A batch modification tool has been developed based on
WINS Space.


Input: configuration files
Output: modified scripts
 Case



Two frequencies 18A and 18B
Cells working at 18A and 18B have varied power:15.2/0/0 to 13.4/0/0
For details about parameter adjustment suggestions, see the right table.
HUAWEI TECHNOLOGIES CO., LTD.
INTERRATHOCOMMGR
OUP
LTE Parameter
Current Value
L18A/L18B: 6[-116 dBm]
L08A: 7[-114 dBm]
ThrshServLow
L18A/L18B: 5[-118 dBm]
L18B->L18A: 7[-114 dBm];
ThreshXHigh
L08A->L18A: 7[-114 dBm]; L08A>L18B: 7[-114 dBm]
non-QCI1:
L18A/L18B: -115 dBm; L08A: -112 dBm
InterFreqHoA1ThdRsrp
QCI1:
L18A/L18B: -100 dBm; L08A: -102 dBm
non-QCI1:
L18A/L18B: -119 dBm; L08A: -116 dBm
InterFreqHoA2ThdRsrp
QCI1:
L18A/L18B: -104 dBm; L08A: -106 dBm
non-QCI1:
INTERFREQHOA4THDRS L18A/L18B: -112 dBm; L08A: -112 dBm
RP
QCI1:
L18A/L18B: -102 dBm; L08A: -100 dBm
non-QCI1:
L18A/L18B: -118 dBm;
InterRatHoA1ThdRsrp
QCI1:
L18A/L18B: -113 dBm;
non-QCI1:
L18A/L18B: -122 dBm;
InterRatHoA2ThdRsrp
QCI1:
L18A/L18B: -117 dBm;
SNonIntraSearch
Proposed Value
(Example, and Varied with RS)
L18A/L18B: 5[-118 dBm]
L18A/L18B:4[-120 dBm]
L18B->L18A: 6[-116 dBm];
L08A->L18A: 6[-116 dBm]; L08A>L18B: 6[-116 dBm]
non-QCI1:
L18A/L18B: -117 dBm; L08A: -114 dBm
QCI1:
L18A/L18B: -102 dBm; L08A: -104 dBm
non-QCI1:
L18A/L18B: -121 dBm; L08A: -118 dBm
QCI1:
L18A/L18B: -106 dBm; L08A: -108 dBm
non-QCI1:
L18A/L18B: -114 dBm; L08A: -114 dBm
QCI1:
L18A/L18B: -104 dBm; L08A: -102 dBm
non-QCI1:
L18A/L18B: -120 dBm;
QCI1:
L18A/L18B: -115 dBm;
non-QCI1:
L18A/L18B: -124 dBm;
QCI1:
L18A/L18B: -119 dBm;
UCELLNFREQPRIOINFO THDTOHIGH
UMTS->L18A/L18B: -114 dBm
UMTS->L18A/L18B: -116 dBm
GCELLPRIEUTRANSYS
THREUTRANHIGH
GSM->L18A/L18B: -108 dBm
GSM->L18A/L18B: -110 dBm
CELLHOPARACFG
BLINDHOA1A2THDRSRP
L18A/L18B: -127 dBm
L08A: -124 dBm
Unchanged
HUAWEI CONFIDENTIAL
Page 18
Feature Activation Confirmation Based on U2020 Tracing
On the U2020, perform RSSI statistics monitoring and RRU output power monitoring, ensuring uplink and downlink channels are working properly.
The RSSI of four channels is normal with
similar level and fluctuate randomly.
Four downlink channels powers are normal
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Page 19
Feature Activation KPI Changes
For details about how to monitor KPIs after 4T deployment, see 4T Counter.
After 4T is enabled, the following issues have occurred:
No. Description
Cause
Optimization Method or Workaround
If Pa or Pb remains unchanged after 2T is restructured to 4T, the power of the traffic
There is no proper workaround.
channel is 3 dB greater than that of the reference channel, the reference channel
You can adjust Pa or Pb, but this is not recommended
experiences more interference than the traffic channel. As a result, the RRC
because the throughput may decrease.
connection reestablishment rate increases.
After 4T is enabled, the service handover
You can optimize the handover trigger threshold,
Some UEs' measurement results fluctuate on a 4T network. The fluctuation is easy
ratio increases even if RS and handover
handover trigger time, and time-to-trigger to reduce
to trigger handovers and therefore increase the number of ping-pong handovers.
parameters remain unchanged.
ping-pong handovers.
See causes of the preceding two problems. The number of RRC connection
After 4T is enabled, the call drop rate
reestablishment failures and the number of handover failures increase, which
may deteriorate. (RAN cause, MME cause, increases the number of service drops.
There is no proper workaround.
VoLTE call drop)
The reference channel experiences more interference, which causes service drops to
easily occur on UEs in an area with weak coverage.
You can set InitialMimoType to TM2 to solve UE
The causes are as follows:
incompatibility caused by closed-loop MIMO in the
After 4T is modified, the RRC connection
UEs in some cells are incompatible if closed-loop MIMO is enabled.
RRC connection setup phase.
setup success rate may slightly
The coverage area changes, and some UEs are located in an area with weak
Theoretically, the changes in an area with weak
deteriorate.
coverage.
coverage cause few impacts on the RRC connection
setup success rate in large-scale commercial use of 4T.
After 4T is enabled, the ibler and rbler may PMI reporting in closed-loop mode on a 4T network increases channel
measurement result fluctuations.
slightly deteriorate.
After 4T is enabled, the RRC connection
1
reestablishment ratio may deteriorate.
2
3
4
5
6
After 2T is restructured to 4T, SINR
obtained in DTs decreases by 2 to 3 dB
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During 4T deployment, reference signal symbols of all channels are staggered, but
data signals of all channels are simultaneously transmitted. Although Pa or Pb
remains unchanged after 2T is restructured to 4T, the power of the traffic channel is This is a common phenomenon.
3 dB greater than that of the reference channel. As a result, RSs' SINR decreases
before balancing.
HUAWEI CONFIDENTIAL
Page 20
Low-frequency 4T
Items
Description
No commercial UE supports 4R in bands 700- It is recommended that CPEs be used for peak throughput test instead of commercial UEs.
900.
In addition, the sites with only commercial terminals may not have rank 3 and rank 4 on OSS statistics.
Gain source of low-frequency 4T4R (for 2R UEs)：
Power gain：If the power of each port remains unchanged when reconstructing from 2T to 4T, the total power of the cell will
be doubled. In noise-limited scenarios, the power gain increases the SINR at the RX to improve the signal quality.
Diversity gain：Increasing the number of antennas reduces the probability of simultaneous deep fading of signals from
Low-frequency 4T still provides gains without multiple antennas, improves the SNR stability at the RX and the reliability of reception.
4R UEs.
Array gain：When the number of antennas increases, a strong directional radiation pattern is generated on the same
polarized antenna by using the strong correlation of spatial channels and the principle of wave interference. The beam
adaptively points to the incoming direction of UEs, thereby improving the SNR and the system capacity or coverage area, and
reducing the interference between UEs. The phase of each transmit antenna is adjusted through the PMI so that signals
arriving at the target UE are superimposed in the same phase. This enhances signals and obtains array gains.
Trial site selection conditions
1. The proportion of UEs at medium and far points exceeds 70%.
(L.Traffic.User.PL9~L.Traffic.User.PL14)/(L.Traffic.User.PL0~L.Traffic.User.PL14) > 70%
2. DL PRB usage > 60%.
Note: The higher the proportion of UEs at the cell edge and the higher the DL PRB usage, the greater the gains.
Cooperative Features
eMIMO（For details, see the following slides.）、SingleCell（For details, see SingleCell Feature Description.）
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Page 21
eMIMO Activation Scripts
CSI Reporting Enhancement&Precise AMC
MOD CELLALGOSWITCH: LocalCellId=0,ULSCHSWITCH=SchedulerCtrlPowerSwitch-1,ULSCHEXTSWITCH=UlDrbProactiveSchSwitch-1,EmimoSwitch=
PreciseAmcSwitch-1&EmimoCsiEnhanceSwitch-1;
MOD CELLDLSCHALGO: LocalCellId=0,CqiOnlyOuterLoopSwitch=ON,AperiodicCsiReportMaxNum=10000,
FDUEEnhAperCQITrigPeriod=10ms,NoSchStopACqiThd=20,EnAperiodicCqiTrigStrategy=CQI_PERIOD_BASED,MidUserMcsThreshold=21,IntrfFilterCoeff=50;
MOD CAMGTCFG: LocalCellId=0, CellCaAlgoSwitch=CaEnhAperiodicCqiRptSwitch-1;
MOD ENODEBALGOSWITCH: CompatibilityCtrlSwitch=ApCqiRptAbnormalCtrlSwitch-1&ApCqiAndAckAbnCtrlSwitch-1;
MOD CELLCOUNTERPARAGROUP: LocalCellId=0, CellCounterAlgoSwitch=BasedA3EdgeUserSwitch-1;
MOD GLOBALPROCSWITCH: X2SonLinkSetupType=X2_OVER_S1, ItfTypeForNonIdealModeServ=X2;
MOD NCELLDLRSRPMEASPARA: LocalCellId=0,NCellDlRsrpMeasA3Offset=-20;
//When the cell bandwidth is 20 MHz:
MOD CELLPDCCHALGO: LocalCellId=0,PDCCHSYMNUMSWITCH=ECFIADAPTIONON,
CFIADJCCETHLD=16CCE,PDCCHADJALGOSWITCH=PdcchRobustnessEnhSw-1;
// When the cell bandwidth is 10 MHz:
MOD CELLPDCCHALGO: LocalCellId=0,PDCCHSYMNUMSWITCH=ECFIADAPTIONON,
CFIADJCCETHLD=8CCE,PDCCHADJALGOSWITCH=PdcchRobustnessEnhSw-1;
//The following commands are used to optimize CA secondary component carrier (SCC) CSI reporting and need to be executed on all the bands.
MOD CAMGTCFG: LocalCellId=0, CellCaAlgoSwitch=CaEnhAperiodicCqiRptSwitch-1;
MOD CELLDLSCHALGO: LocalCellId=0, FDUEEnhAperCQITrigPeriod=10ms,NoSchStopACqiThd=20;
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Page 22
eMIMO Activation Scripts
Data-Learning-based Downlink Intelligent AMC
//Turning on the DL_INTEL_AMC_SELECTION_SW.
MOD CellIntelAmcConfig: LocalCellId=0, IntelligentAmcSwitch=DL_INTEL_AMC_SELECTION_SW-1, DlPredErrorUpperLimit=5;
//Turning on the UMPTB_ENHANCEMENT_SWITCH when the UMPTb is used as the main control board and resetting the application
MOD ENODEBRESMODEALGO: ServiceMode=UMPTB_ENHANCEMENT_SWITCH-1;
//Before resetting APP, ensure that the AT corresponding to the AID to be reset is eNodeB. (check the configuration of the APPLICATION MO in the configuration file.)
RST APP: AID=x;
//Turning on the AI_ENHANCEMENT_SWITCH when the UMPTe or UMPTga is used as the main control board and resetting the application
MOD ENODEBRESMODEALGO: ServiceMode=AI_ENHANCEMENT_SWITCH-1;
RST APP: AID=x;
//Turning on the UMPTG_ENHANCEMENT_SWITCH when the UMPTg is used as the main control board and resetting the application
MOD ENODEBRESMODEALGO: ServiceMode=UMPTG_ENHANCEMENT_SWITCH-1;
RST APP: AID=x;
//Setting the Middle User Mcs Threshold parameter
MOD CELLDLSCHALGO: LocalCellId=0, MidUserMcsThreshold=21;
//Setting the RB Priority MCS Select Max Decrease in TBS Index parameter
MOD CELLDLSCHALGO:LOCALCELLID=0, RBPRIMCSSELECTMAXDECTBSIDX=6;
//Setting the RBG Resource Allocation Strategy parameter
MOD CELLDLSCHALGO: LocalCellId=0, RbgAllocStrategy=ROUND_UP;
// Turning on the SmallPktMcsSelectAlgoSw
MOD CELLALGOSWITCH: LocalCellId=0, DlSchSwitch=SmallPktMcsSelectAlgoSw-1;
// Turning on the PreciseMcsAdaptSwitch
MOD CELLALGOSWITCH: LocalCellId=0, CqiAdjAlgoSwitch=PreciseMcsAdaptSwitch-1;
// Turning on the RptCqiFltInitSwitch
MOD CELLALGOSWITCH: LocalCellId=0, CqiAdjAlgoSwitch=RptCqiFltInitSwitch-1;
// Turning on the ApCqiAndAckAbnCtrlSwitch
MOD ENODEBALGOSWITCH: CompatibilityCtrlSwitch=ApCqiAndAckAbnCtrlSwitch-1;
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Page 23
4x4 Peak Throughput Testing
 Peak throughput in ideal environments
Bandwidth
DL 2x2 MIMO (Mbit/s)
DL 4x4 MIMO (Mbit/s)
UL 1x2(4) (Mbit/s)
10 MHz
70（64QAM）\90（256QAM）
140(64QAM)\181(256QAM)
34.0
15 MHz
108（64QAM）\140（256QAM）
213(64QAM)\276(256QAM)
50.8
20 MHz
147（64QAM）\190（256QAM）
290(64QAM)\382(256QAM)
68.6
 Test suggestions
 SIM card profile requirements: The subscription MBR must be greater than the theoretical peak throughput. QCI7 bearers are recommended to ensure
demonstration consistency. If all standard QCIs are occupied, use extended QCIs for demonstration.
 Cell requirements: The peak rate test must use all resources of the cell. Configure the cell to be unavailable for other users or test during none-peak hours.
 Requirements of neighboring cell-introduced interference: Peak rate tests require rank 3 or 4 be reached. Throughput corresponding to rank 3 or 4 is sensitive to
neighbor cell interference. During peak rate tests, reduce neighbor cell interference or disable neighbor cells. Ensure that the SINR of the test UE is greater than
26dB (preferably 30dB) and the RSRP is between -65 and -85dBm.
 Multi-path requirements: points with Direct path and refraction paths (The direct radiation path refers to a Line-of-Sight path for signals from the eNodeB to the
UE. The refraction path refers to a signal sent by the base station that can be refracted to the UE through surrounding buildings or other objects. The refraction
path can be constructed by placing an umbrella behind the terminal.) so that UE enters rank 4 stably.
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Page 24
Site Selection for 4x4 Peak Throughput Test with Commercial UE
Site selection for 4x4 peak rate tests using commercial UEs

UE capability confirmation: Check the signaling to determine whether
the UE has 4R capabilities in corresponding bands.
a) fourLayerTM3-TM4-r10: supporting four streams in TM3/4 mode
b) supportMIMO-CapabilityDL-r10: supporting four streams in TM9/TM10
mode

Commercial UE tracing and observation
a) Use QXDM to trace a UE equipped with a Qualcomm chip.
b) Use HIDS to trace a UE equipped with a Hisilicon chip.
c) No systems are available for tracing a UE equipped with a Samsung chip.

Network side tracing
a) UE capabilities can be traced over standard interfaces (Virtual UE trace).
b) User-level tracing provides THE signal strength, rate, MCS, and BLER.
c) TTI-level tracing can trace L2 CellDT (34/50/102)

Site selection is similar to that for peak rate tests using TUEs
a) The test site must be in the main lobe of the antenna and has enough
direct and reflection paths.
b) The RSRP cannot be excessively high. A value within the range of –70
dBm to –80 dBm is preferred.
c) The SINR must be greater than 26. Reduce the neighbor cell power or
block neighbor cells to increase the SINR.
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Multi-path Environment Selection for 4x4 Peak Rate Tests
 Field experience
Example
Leaves shelter:
Reflection + Refraction
TUE ANT position
SITE ANT
Example
 TUE in main direct
SITE ANT
Leaves shelter
path
 Shelter is needed
between them for
Reflection path
Reflection path
TUE
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Refraction path
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TUE
Page 26
Resource Guarantee for 4x4 Peak Throughput Tests with Commercial
UEs or NG TUEs
During tests or demonstration on the live network, commercial UEs often grab resources from the test cells. As a result, the peak
throughput cannot be reached. To mitigate this issue, QCI-based resource guarantee solution is recommended. With this solution,
TUEs are allocated with dedicated QCIs, which is assigned with higher scheduling priority to ensure sufficient resources for TUEs.
In the following example, QCI 7 is used by TUEs for demonstration.
1. Use a SIM card to register the network and subscribe to QCI 7.
2. Increase the downlink scheduling priorities of QCI 7 services and decrease the downlink scheduling priorities of other QCIs being
used in the live network
MOD CellQciParaExtension: LocalCellId=xx, Qci=7, DLSchPriorityWeightFactor=1000;
MOD CellQciParaExtension: LocalCellId=xx, Qci=6, DLSchPriorityWeightFactor=1;
MOD CellQciParaExtension: LocalCellId=xx, Qci=8, DLSchPriorityWeightFactor=1;
3. Set the RLC mode to AM for QCI 7.
MOD QciPara: Qci=Qci7, RlcPdcpParaGroupId=5;
MOD RlcPdcpParaGroup: RlcPdcpParaGroupID=5, RlcMode=RlcMode_AM;
4. Disable DRX for QCI 7. (DRX disabling is a QCI-level operation. DRX is still enabled for other QCIs.)
MOD CellQciPara:LocalCellId=xx, Qci=7, DrxParaGroupId=0;
MOD DRXParaGroup:LocalCellId=xx, DrxParaGroupId=0, EnterDrxSwitch=OFF;
5. Change the QCI-level pre-scheduling period to 1 ms for QCI 7 and disable pre-scheduling for other QCIs.
ADD CellPreAllocGroup: LocalCellID=X, PreAllocationParaGroupID=0, PreAllocationSwitch=On, PreAllocationMinPeriod=1;
MOD CellQciPara: LocalCellId=X, Qci=QCI7, PreAllocationParaGroupID=0;
MOD CellPdcchAlgo: LocalCellId=X, HysForCfiBasedPreSch=0, PdcchMaxCodeRate=100;
Scripts updated based on SRAN 17.1
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Thank You!
CONFIDENTIAL