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RAN16.0 HSUPA Power Control
Enhancement
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Feature Introduction
Feature Benefits
Feature Deployment
Performance Monitoring
Application Cases
Precautions (FAQ)
Reference Documents & Glossary
Contents
Objective
After completing this course, you are supposed to:
Learn about the benefits and application scenarios of HSUPA Power Control
Enhancement.
Learn about the specifications of HSUPA Power Control Enhancement.
Learn about the basic principles of HSUPA Power Control Enhancement.
Be able to configure and verify the HSUPA Power Control Enhancement feature and
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Feature Introduction-Background (1/4)
This feature is used for controlling power on the UMTS networks and is available in section 7.2.4 of HSUPA Power Control Enhancement Feature Parameter Description.
Channel Type Power Control Algorithm Detailed Algorithm Related Features
Common channel
Uplink common channel power control PRACH
Downlink common channel power control
P-CPICH P-SCH S-SCH
WRFD-150236 Load Based Dynamic Adjustment of PCPICH P-CCPCH S-CCPCH AICH PICH DCH
Open loop power control WRFD-020501 Open Loop Power Control
Uplink DPCH open loop power control Downlink DPCH open loop power control Downlink F-DPCH open loop power control
Inner loop power control WRFD-020504 Inner Loop Power Control
Uplink DPCH inner loop power control in normal mode
WRFD-150230 DPCH Pilot Power Adjustment
Inner Loop Power Control Optimization Based on RTWP Measurement
Uplink DPCH inner loop power control in compressed mode
Downlink DPCH/F-DPCH inner loop power control in normal mode WRFD-150235 DPCH Maximum Power Restriction Downlink DPCH/F-DPCH inner loop power control
in compressed mode
Downlink power balance WRFD-020502 Downlink Power Balance Outer loop power control WRFD-020503 Outer Loop Power Control
BLER-based outer loop power control BER-based outer loop power control Downlink outer loop power control
Outer loop power control enhancement Outer Loop Power Control Optimization Based on RTWP Measurement HSDPA channel WRFD-01061004 HSDPA Power Control
HS-DPCCH power control HS-SCCH power control
HS-SCCH power control in the CELL_DCH state HS-SCCH power control in the enhanced CELL_FACH state Power control in the enhanced CELL_PCH/URA_PCH state
HSUPA channel WRFD-01061203 HSUPA Power Control
E-DPCCH power control
E-DPDCH power control WRFD-020138 HSUPA Coverage Enhancement at UE Power LimitationWRFD-010712 Adaptive Configuration of Traffic Channel Power Offset for HSUPA
E-DCH outer loop power control
Outer Loop Power Control
Outer Loop Power Control Optimization Based on RTWP Measurement Joint Optimization of Inner Loop Power Control Optimization Based on RTWP Measurement and E-DCH Outer Loop Power Control
E-AGCH, E-RGCH, and E-HICH power control
Fixed power-based power control Downlink DPCH/F-DPCH-based power control
HSUPA E-AGCH power control (based on CQI or HS-SCCH) WRFD-01061401 HSUPA E-AGCH Power Control (Based on CQI or HS-SCCH)
Page5
Feature Introduction-Background (2/4)
HSUPA power control includes DPCCH-based inner loop power control and outer loop power control based on the number of E-DCH HARQ
retransmission times.
Inner loop power control Adjust the uplink DPCCH power. Outer loop power control
Set the target SIR.
SIR measurement and comparison Measurement and
comparison for the number of retransmission times Set the number of target
retransmission times. Set the initial SIR. Set the number of initial
retransmission times.
NE Measurement Purpose NE Interaction
RNC Number of retransmission times Adjust the target SIR based on the number of retransmission times. The RNC sends the latest target SIR to the NodeB.
NodeB SIR Adjust the power based on the rule of ensuring that the SIR can be equal to the target SIR. The NodeB sends the uplink DPCCH power adjustment command to the UE.
Number of
Retransmission Times SIR Target
↑ ↓
↓ ↑
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Feature Introduction-Background (3/4)
This feature is used for controlling power on the UMTS networks and is available in section 7.2.4 of HSUPA Power Control
Enhancement Feature Parameter Description.
In the HSUPA high-rate data transmission (such as higher than 2 Mbit/s) scenario with multipath effect, the SIR estimations are
far from accurate. As a result, the RTWP abnormally increases, which causes interference to other UEs in the cell. After HSUPA
Power Control Enhancement is enabled, the SIR estimations are optimized to decrease the interference to other UEs. In this way,
the cell throughput increases.
HSUPA Power Control Enhancement
In a high load cell, there is a small number of high-rate HSUPA UEs and some other low-rate UEs. Once the RTWP reaches an instant peak value because of high upload (such as higher than 2 Mbit/s), all the other UEs in this cell have poor service experience.
AMR T raffic PS R99 Tra ffic HS DP A H SD PC CH Loa d HS U PA T ra ffic (su ch a s uplo adin g r ate is ab ov e 2 M bit/s)
Decrease the interference of high-rate HSUPA UEs by performing inner loop power control optimization. Cell throughput increases by 5% to 10%. AMR T raffic PS R99 Tra ffic HS DP A H SD PC CH Loa d HS U PA Tra ffic(s uc h as u plo ad ing rate is ab ov e 2 M bit/s)
Page7
Feature Introduction-Background (4/4)
In the HSUPA low-rate data transmission (such as lower than 200 kbit/s) scenario, the interference among UEs
causes the RTWP to abnormally increase. After HSUPA Power Control Enhancement is enabled, joint optimization
on inner loop and outer loop power control is performed to decrease the interference among non-QoS-sensitive
UEs. In this way, the cell throughput increases.
In a high load cell, there is a large number of UEs, and most are HSUPA UEs. Once there is an abnormal RTWP increase because of mutual interference, all UEs in this cell have poor service experience.
AMR T raffic VoIP PS R 99 T raffi c HS DP A H SD PC CH Loa d H S U P A T ra ffi c H S U P A T ra ffi c HS UP A T raffic HSU PA T raffic
Decrease the interference of HSUPA UEs by performing joint optimization for inner loop and outer loop power control.
As a result, cell throughput increases by 2% to 10%, and system stability is improved in this high load cell. AMR T raffic VoIP PS R99 Tra ffic HS DP A H SD PC CH Loa d H S U P A T ra ffi c H S U P A T ra ffi c HS UP A T raffic HSU PA T raffic
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Feature Introduction-Technical Principle
This feature is implemented on the NodeB, serving the high-rate non-DTX HSUPA UEs, low-rate non-DTX HSUPA UEs, and DTX HSUPA
UEs. When the RTWP abnormally increases, this feature can be enabled based on the following procedure
Note 1: This feature contains two algorithm Branch for decreasing the RTWP that abnormally increases Note 2: The user recognition algorithm is introduced in RAN14.0. DTX UEs and non-DTX UEs are determined in the following way:
Note 3: Whether the RTWP is abnormal can be determined by comparing the actual RTWP with the severe congestion threshold. If the actual RTWP is greater than or equal to the threshold, the RTWP is abnormal. Introduced in RAN14.0, the severe congestion threshold is obtained based on the cell load and dynamic target RoT adjustment result.
Note 4: In RAN14.0, the NodeB reports the UE congestion indication to the RNC. If the RNC receives the indication, the RNC sets the maximum SIRtarget to min{current SIRtarget, INITSIRTARGET}. At the same time, the RNC starts a 50 ms timer and keeps the maximum SIRtarget unchanged until the timer expires. If the RNC does not receive the UE congestion indication, it sets the UE status to "Not Congested" and the maximum SIRtarget to MAXSIRTARGET.
HSUPA UEs with no data transmission for
more than 200 ms are regarded as DTX
UEs. When data transmission resumes, the
HSUPA UEs are regarded as non-DTX UEs.
Non-DTX UEs over HSUPA channels are
classified into high-rate non-DTX UEs and
low-rate non-DTX UEs: UEs in the initial
service setup phase are regarded as
low-rate UEs. If a UE is regarded as a low-low-rate
UE and the effective throughput of the UE is
greater than or equal to 700 kbit/s, the rate
of the UE will be increased so that the UE
will become a high-rate UE. If a UE is
regarded as a high-rate UE and the
effective throughput of the UE is less than
or equal to 160 kbit/s, the rate of the UE
will be reduced and the UE will become a
low-rate UE.
Feature Introduction-Application Scenarios
Typical scenarios
This feature is used in cells with high-rate HSUPA UEs (for example, greater than 2
Mbit/s) or with a large proportion of HSUPA UEs (for example, greater than 50%), and
the RTWP increases (for example, greater than the RTWP corresponding to the target
load), such as hotspots in cities.
If the background noise is –106 dBm, RTWPs of different target
loads are as follows:
Target Load
Rise of Background
Noise
RTWP
50%
3 dB
-103 dBm
60%
4 dB
-104 dBm
75%
6 dB
-100 dBm
88%
9 dB
-97 dBm
The following figure shows the relationship between the
target load and rise of background noise.
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Feature Introduction
Feature Benefits
Feature Deployment
Performance Monitoring
Application Cases
Precautions (FAQ)
Reference Documents & Glossary
Contents
Feature Benefits and Network Impact
Feature benefits
In the HSUPA high-rate data transmission (such as higher than 2 Mbit/s) scenario with multipath effect, the
throughput can increase by 5% to 10% after the SIR estimations are optimized. In this scenario, when UEs move
from the cell center to the cell edge, the number of uplink retransmissions equals to that of uplink target
retransmission times, and throughput of high-rate HSUPA UEs at the cell edge increases by 5% to 10%.
In the HSUPA low-rate data transmission (such as lower than 200 kbit/s) scenario, interference among UEs will lead
to abnormal RTWP increase. Therefore, the HSUPA Power Control Enhancement feature is introduced to improve
cell throughput by adjusting the SIR and reducing interference in low-rate data transmission. When there is a large
number of HSUPA UEs in a cell, the gains of the feature are more significant. For example, if there are more than 20
UEs in a cell and the proportion of HSUPA UEs is greater than 50%, this feature can effectively reduce the RTWP
that exceeds the RTWP corresponding to the target load, and increases the cell throughput by 2% to 10%.
Network impact
The UMTS system is an interference-limited system in which UEs interfere each other and the RTWP abnormally
increase accordingly. When a small number of HSUPA UEs perform high-rate data transmission (such as greater
than 2 Mbit/s) in the scenario with multipath effect, the RTWP may surge to an instant peak and the SIRtarget may
be equal to MaxSirtarget. Consequently, outer loop power control does not coverage. In this case, this feature can
reduce the RTWP peak value and improve the system stability.
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Feature Introduction
Feature Benefits
Feature Deployment
Performance Monitoring
Application Cases
Precautions (FAQ)
Reference Documents & Glossary
Contents
Feature Deployment-Prerequisites
Prerequisite Features
This feature requires the WRFD-01061203 HSUPA Power Control feature.
Mutually Exclusive Features
None
Impacted Features
None
Dependencies on Hardware
This feature requires 3900 series base stations. Uplink services must be established on the WBBPd,
WBBPf, or UBBP board, and downlink services must be established on the WBBPb, WBBPd, WBBPf or
UBBP board.
Dependency on Other NEs
None
License
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Feature Deployment-When to Use This
Feature and Required Information (1)
When to Use This Feature
This feature is used in cells with high-rate HSUPA UEs (for example, greater than 2
Mbit/s) or with a large proportion of HSUPA UEs (for example, greater than 50%), and the
RTWP increases (for example, greater than the RTWP corresponding to the target load),
such as hotspots in cities.
Feature Deployment-When to Use This
Feature and Required Information (2)
Required Information
Before activating this feature, collect the following information to evaluate whether this feature is suitable for the live network.
Number of cell UEs and average number of HSUPA UEs in a cell
–
The number of cell UEs and average number of HSUPA UEs in a cell is indicated by VS.CellDCHUEs and
VS.HSUPA.UE.Mean.Cell, respectively. The proportion of HSUPA UEs can be calculated by using the following formula:
Proportion of HSUPA UEs = VS.HSUPA.UE.Mean.Cell/VS.CellDCHUEs
The gain provided by this feature is noticeable only when the load is limited and there is a large number of HSUPA UEs in
this cell, for example, the proportion of HSUPA UEs account for more than 50%.
Cell RTWP and cell throughput
–
VS.HSUPA.MeanChThroughput
~ This counter can be used to compare the throughput before and after this function is enabled.
–
VS.MeanRTWP
~ This counter indicates whether the RTWP during busy hours exceeds the RTWP corresponding to the target load.
For example, if the target load is 75% and the background noise is –106 dBm, then the RTWP corresponding to the
target load is –100 dBm.
~ This counter can be used to check whether the RTWP decreases after this function is enabled.
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Feature Deployment-When to Use This
Feature and Required Information (3)
Throughput of HSUPA UEs in different ranges of load over the Uu interface in a cell
Average number of 2 ms/10 ms TTI HSUPA UEs in different rate ranges in a cell
Counter Name Description
VS.HSUPA.Thruput.ROTMor3 Cell throughput of HSUPA users under the 3 dB or above Uu interface load VS.HSUPA.Thruput.ROTMor6 Cell throughput of HSUPA users under the 6 dB or above Uu interface load VS.HSUPA.Thruput.ROTMor7 Cell throughput of HSUPA users under the 7 dB or above Uu interface load VS.HSUPA.Thruput.ROTMor9 Cell throughput of HSUPA users under the 9 dB or above Uu interface load VS.HSUPA.Thruput.ROTMor10 Cell throughput of HSUPA users under the 10 dB or above Uu interface load VS.HSUPA.Thruput.ROTMor13 Cell throughput of HSUPA users under the 13 dB or above Uu interface load VS.HSUPA.Thruput.ROTMor20 Cell throughput of HSUPA users under the 20 dB or above Uu interface load VS.HSUPA.Thruput.ROTAll Cell throughput under all Uu interface loads
Counter Name Description
VS.HSUPA.LowRateTTI2msUserNumber Average number of 2 ms TTI HSUPA users at a rate in the range of [0 kbit/s, 23.25 kbit/s) in a cell VS.HSUPA.TTI2msUserNumber.0 Average number of 2 ms TTI HSUPA users at a rate of below 150 kbit/s in a cell
VS.HSUPA.TTI2msUserNumber.1 Average number of 2 ms TTI HSUPA users at a rate in the range of [150 kbit/s, 700 kbit/s] in a cell VS.HSUPA.TTI2msUserNumber.2 Average number of 2 ms TTI HSUPA users at a rate in the range of [700 kbit/s, 1500 kbit/s] in a cell VS.HSUPA.TTI2msUserNumber.3 Average number of 2 ms TTI HSUPA users at a rate in the range of [1500 kbit/s, 3000 kbit/s] in a cell VS.HSUPA.TTI2msUserNumber.4 Average number of 2 ms TTI HSUPA users at a rate in the range of [3000 kbit/s, 4000 kbit/s] in a cell VS.HSUPA.TTI2msUserNumber.5 Average number of 2 ms TTI HSUPA users at a rate in the range of [4000 kbit/s, 12000 kbit/s] in a cell VS.HSUPA.TTI10msUserNumber.0 Average number of 10 ms TTI HSUPA users at a rate of interval 0 in a cell
VS.HSUPA.TTI10msUserNumber.1 Average number of 10 ms TTI HSUPA users at a rate of interval 1 in a cell VS.HSUPA.TTI10msUserNumber.2 Average number of 10 ms TTI HSUPA users at a rate of interval 2 in a cell VS.HSUPA.TTI10msUserNumber.3 Average number of 10 ms TTI HSUPA users at a rate of interval 3 in a cell VS.HSUPA.TTI10msUserNumber.4 Average number of 10 ms TTI HSUPA users at a rate of interval 4 in a cell VS.HSUPA.TTI10msUserNumber.5 Average number of 10 ms TTI HSUPA users at a rate of interval 5 in a cell VS.HSUPA.TTI10msUserNumber.6 Average number of 10 ms TTI HSUPA users at a rate of interval 6 in a cell VS.HSUPA.TTI10msUserNumber.7 Average number of 10 ms TTI HSUPA users at a rate of interval 7 in a cell
Feature Deployment-When to Use This
Feature and Required Information (4)
Load over the Uu interface of a cell
Compare the load probability distribution after this feature takes effect.
Counter Name Description
VS.HSUPA.LoadOutput.0 Number of times that the load on the air interface is within the range of [0, 0.5) dB
VS.HSUPA.LoadOutput.1 Number of Cell Ul Load Between 0.5db to 1db VS.HSUPA.LoadOutput.2 Number of Cell Ul Load Between 1.0db to 1.5db VS.HSUPA.LoadOutput.3 Number of Cell Ul Load Between 1.5db to 2db VS.HSUPA.LoadOutput.4 Number of Cell Ul Load Between 2.0db to 2.5db VS.HSUPA.LoadOutput.5 Number of Cell Ul Load Between 2.5db to 3.0db VS.HSUPA.LoadOutput.6 Number of Cell Ul Load Between 3.0db to 3.5db VS.HSUPA.LoadOutput.7 Number of Cell Ul Load Between 3.5db to 4db VS.HSUPA.LoadOutput.8 Number of Cell Ul Load Between 4db to 5db VS.HSUPA.LoadOutput.9 Number of Cell Ul Load Between 5db to 6db VS.HSUPA.LoadOutput.10 Number of Cell Ul Load Between 6db to 7db VS.HSUPA.LoadOutput.11 Number of Cell Ul Load Between 7db to 8db VS.HSUPA.LoadOutput.12 Number of Cell Ul Load Between 8db to 9db VS.HSUPA.LoadOutput.13 Number of Cell Ul Load Between 9db to 10db VS.HSUPA.LoadOutput.14 Number of Cell Ul Load Between 10db to 11db VS.HSUPA.LoadOutput.15 Number of Cell Ul Load Between 11db to 12db VS.HSUPA.LoadOutput.16 Number of Cell Ul Load Between 12db to 13db VS.HSUPA.LoadOutput.17 Number of Cell Ul Load Between 13db to 14db VS.HSUPA.LoadOutput.18 Number of Cell Ul Load Between 14db to 15db VS.HSUPA.LoadOutput.19 Number of Cell Ul Load Between 15db to 16db
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Feature Deployment-Network Planning
Network planning
None
RF planning
None
Feature Deployment-Parameter Preparation
Parameter Name
Parameter ID
Setting Notes
Data Source
Version
RTWP Abnormal SIR
Target Adjustment Switch
RTWPSIRTGTADJSW
It is recommended that
this switch be set to on
in hotspots with lots of
HSUPA UEs whose
transmit power is
limited.
Default
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Feature Deployment – Activation
Using MML Commands
Run the NodeB MML command SET ULOCELLALGPARA and set
RTWPSIRTGTADJSW to ON
.
MML Command Examples (Enabling this Feature)
SET ULOCELLALGPARA: CellID=xx, RTWPSIRTGTADJSW=ON;
//xx indicates the ID of the cell.
Feature Deployment-Activation Observation (1)
Observe related KPIs in labs or drive tests for HSUPA high-rate data transmission.
In the scenario with multipath effect in which uplink services are carried on WBBPd boards, use an HSUPA UE to
perform continuous data transmission through FTP. Check whether the target SIR decreases by 1 to 3 dB.
On the RNC LMT main page, click Monitor. In the Monitor Navigation Tree pane, choose Monitor > UMTS
Monitoring > Connection Performance Monitoring. The Connection Performance Monitoring dialog box is
displayed. In this dialog box, set Monitor Item to OLPC. If the target SIR has decreased by 1 to 3 dB, this
feature has been activated (keep tracing the target SIR for 2 to 3 minutes to obtain the average value).
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Feature Deployment-Activation Observation (1)
Observe related KPIs after the network has been running for a period.
Obtain the counters listed in the preceding tables within a week (at a specified busy hour every day)
before and after this feature is enabled. The following figure shows the comparison results. After this
feature is enabled, the possibility that the load over the Uu interface of the cell exceeding 20 dB
decreases noticeably (such as by 10% to 70%).
Feature Deployment – Deactivation
Using MML Commands
Run the NodeB MML command SET ULOCELLALGPARA and set
RTWPSIRTGTADJSW to OFF.
MML Command Examples (Disabling this Feature)
SET ULOCELLALGPARA: CellID=xx, RTWPSIRTGTADJSW=OFF;
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Feature Deployment - Troubleshooting
None
Feature Introduction
Feature Benefits
Feature Deployment
Performance Monitoring
Application Cases
Precautions (FAQ)
Reference Documents & Glossary
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Performance Monitoring – New Counter
None
Performance Monitoring - Feature Evaluation
Evaluate the feature from the following aspects:
In HSUPA high-rate data transmission (such as greater than 2 Mbit/s) scenarios with
multipath effect, check whether the throughput increases (such as 5% to 10%) after this
feature has been enabled.
In hotspots, when the number of HSUPA UEs is large (for example, the number of total
UEs is greater than 20 and the proportion of HSUPA UEs account for more than 50%).
and cell load reaches the maximum, check whether the RTWP is reduced and cell
throughput increases by 2% to 10% after this feature is enabled.
When the RTWP is abnormally high, check whether this feature reduces the impact on
the RTWP increase from non-QoS-sensitive UEs, improves the network stability, and
reduces the call drop rate.
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Performance Monitoring - Parameter Optimization
None
Feature Introduction
Feature Benefits
Feature Deployment
Performance Monitoring
Application Cases
Precautions (FAQ)
Reference Documents & Glossary
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Application Cases
The feature is activated at 2014/4/9(00:00am) on most cells under Kuwait VIVA RNC3.
We choose the top Cell 48552 to analyze, which meet better the requisite conditions :
RTWP is higher and HUSPA User number is greater.
After enable this Enhancement
： The Uu interface load of the cell exceeds 16 dB （ >
VS.HSUPA.LoadOutput.20
） noticeably decreases by 60%, and increases the cell
throughput by 7%.
Application Cases
1T2R networking for HSUPA high-rate data transmission
The following figure shows the simulated 1T2R network for uplink services.
Duplexer: separates the uplink and downlink signals. A circulator can also be used
(signals are transmitted in one direction).
Attenuator 1: used to adjust the RTWP of the RX antenna.
Attenuator 2: used to adjust the downlink path loss.
