Control Potencia

Power Control
eRAN3.0
Feature Parameter Description
Issue 01
Date 2012-03-30
HUAWEI TECHNOLOGIES CO., LTD.

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eRAN
Power Control Contents
Issue 01 (2012-03-30) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
i
Contents
1 Introduction................................................................................................................................1-1
1.1 Scope ............................................................................................................................................ 1-1
1.2 Intended Audience......................................................................................................................... 1-1
1.3 Change History.............................................................................................................................. 1-1
2 Overview of Power Control ....................................................................................................2-1
2.1 LBFD-002016 Dynamic Downlink Power Allocation ..................................................................... 2-1
2.2 LBFD-002026 Uplink Power Control............................................................................................. 2-2
3 Downlink Power Control .........................................................................................................3-1
3.1 Overview ....................................................................................................................................... 3-1
3.2 Power Allocation for Cell-specific Reference Signals ................................................................... 3-1
3.3 Power Allocation for Synchronization Signals............................................................................... 3-1
3.4 Power Allocation for the PBCH ..................................................................................................... 3-1
3.5 Power Allocation for the PCFICH.................................................................................................. 3-1
3.6 Power Allocation for the PDSCH Carrying RACH Response, Paging Messages, and SIBs ........ 3-2
3.7 Power Allocation for the PHICH .................................................................................................... 3-2
3.8 Power Allocation for the PDCCH Carrying Dedicated Control Information................................... 3-2
3.9 Power Allocation for the PDSCH Carrying Information Other Than RACH Response, Paging
Messages, and SIBs ........................................................................................................................... 3-3
3.9.1 Basics of PDSCH Power Calculation ................................................................................... 3-3
3.9.2 Power Control Mechanism for the PDSCH .......................................................................... 3-4
3.9.3 PDSCH Power Adjustment................................................................................................... 3-4
4 Uplink Power Control...............................................................................................................4-1
4.1 Overview ....................................................................................................................................... 4-1
4.2 Power Control for the PRACH....................................................................................................... 4-1
4.2.1 Basics of PRACH Power Calculation ................................................................................... 4-1
4.2.2 preoP _ Setting by the eNodeB ............................................................................................ 4-2
4.2.3 PRACH Power Ramping for the UE ..................................................................................... 4-2
4.3 Power Control for the PUSCH....................................................................................................... 4-2
4.3.1 Basics of PUSCH Power Calculation ................................................................................... 4-2
4.3.2 Initial Power Setting for the PUSCH by the eNodeB............................................................ 4-3
4.3.3 Transmit Power Adjustment for the PUSCH by the eNodeB................................................ 4-3
4.3.4 Msg3 Power Control in Random Access.............................................................................. 4-4
4.4 Power Control for the PUCCH ...................................................................................................... 4-4
4.4.1 Basics of PUCCH Power Calculation ................................................................................... 4-5
4.4.2 Initial Power Setting for the PUCCH by the eNodeB............................................................ 4-5
4.4.3 Transmit Power Adjustment for the PUCCH by the eNodeB................................................ 4-6
4.5 Power Control for Sounding Reference Signals ........................................................................... 4-6
4.5.1 Basics of SRS Power Calculation ........................................................................................ 4-6

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4.5.2 SRS Transmit Power Setting by the eNodeB....................................................................... 4-7
5 Related Features.......................................................................................................................5-1
5.1 Downlink Power Control................................................................................................................ 5-1
5.1.1 Required Features................................................................................................................ 5-1
5.1.2 Mutually Exclusive Features................................................................................................. 5-2
5.1.3 Affected Features ................................................................................................................. 5-2
5.2 Uplink Power Control .................................................................................................................... 5-2
5.2.1 Required Features................................................................................................................ 5-2
5.2.2 Mutually Exclusive Features................................................................................................. 5-3
5.2.3 Affected Features ................................................................................................................. 5-3
6 Impact on the Network.............................................................................................................6-1
6.1 Downlink Power Control................................................................................................................ 6-1
6.1.1 Impact on System Capacity.................................................................................................. 6-1
6.1.2 Impact on Network Performance.......................................................................................... 6-1
6.2 Uplink Power Control .................................................................................................................... 6-1
6.2.1 Impact on System Capacity.................................................................................................. 6-1
6.2.2 Impact on Network Performance.......................................................................................... 6-2
7 Engineering Guidelines...........................................................................................................7-1
7.1 When to Use Power Control.......................................................................................................... 7-1
7.1.1 Downlink Power Control ....................................................................................................... 7-1
7.1.2 Uplink Power Control............................................................................................................ 7-1
7.2 Information to Be Collected........................................................................................................... 7-2
7.3 Network Planning .......................................................................................................................... 7-2
7.4 Deploying Downlink Power Control............................................................................................... 7-2
7.4.1 Deployment Requirements................................................................................................... 7-2
7.4.2 Data Preparation................................................................................................................... 7-2
7.4.3 Initial Configuration............................................................................................................. 7-10
7.4.4 Activation Observation........................................................................................................ 7-11
7.4.5 Deactivation........................................................................................................................ 7-17
7.5 Deploying Uplink Power Control ................................................................................................. 7-18
7.5.1 Deployment Requirements................................................................................................. 7-18
7.5.2 Data Preparation................................................................................................................. 7-18
7.5.3 Initial Configuration............................................................................................................. 7-22
7.5.4 Activation Observation........................................................................................................ 7-23
7.5.5 Deactivation........................................................................................................................ 7-28
7.6 Performance Optimization........................................................................................................... 7-28
7.7 Troubleshooting........................................................................................................................... 7-28
8 Parameters..................................................................................................................................8-1
9 Counters......................................................................................................................................9-1

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10 Glossary..................................................................................................................................10-1
11 Reference Documents .........................................................................................................11-1

eRAN
Power Control 1 Introduction
1-1
1 Introduction
1.1 Scope
This document describes features related to power control in terms of implementation, parameters
involved, feature relationships, network impact, and engineering guidelines.
Any managed objects (MOs), parameters, alarms, or counters described in this document correspond to
the software release delivered with this document. In the event of updates, the updates will be described
in the product documentation delivered with the latest software release.
1.2 Intended Audience
This document is intended for:
 Personnel who need to understand power control
 Personnel who work with Huawei Long Term Evolution (LTE) products
1.3 Change History
This section provides information about the changes in different document versions.
There are two types of changes, which are defined as follows:
 Feature change: refers to a change in the power control feature of a specific product version.
 Editorial change: refers to a change in wording or the addition of information that was not described in
the earlier version.
Document Issues
The document issues are as follows:
 01 (2012-03-30)
 Draft A (2012-01-10)
01 (2012-03-30)
This is the first official release.
Compared with draft A (2012-01-10) of eRAN3.0, issue 01 (2012-03-30) of eRAN3.0 includes the
following changes.
Change Type Change Description Parameter Change
Feature change None None
Editorial change Revised chapter 7 "Engineering Guidelines." None
Draft A (2012-01-10)
This is a draft.
Compared with issue 01 (2011-12-24) of eRAN2.2, draft A (2012-01-10) of eRAN3.0 includes the
following changes.

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Power Control 1 Introduction
1-2
Change Type Change Description Parameter Change
Feature change None None
Editorial change  Optimized the technical description.
 Added chapters 5 "Related Features" and 6 "Impact
on the Network."
None

eRAN
Power Control 2 Overview of Power Control
2-1
2 Overview of Power Control
E-UTRAN systems use the Orthogonal Frequency Division Multiple Access (OFDMA) technology on the
downlink and the Single Carrier Frequency Division Multiple Access (SC-FDMA) technology on the
uplink. With these technologies, the subcarriers of user equipment (UEs) in a cell are orthogonal. Power
control compensates for path loss and shadow fading, counteracts interference between cells, and helps
meet coverage and capacity requirements. Power control in E-UTRAN is classified by signal direction
into uplink power control and downlink power control.
In the E-UTRAN, power control is performed on eNodeBs and UEs for the following purposes:
 Ensuring quality of service
Power control adjusts the transmit power to the optimal level to provide services of a certain quality
level that meets the requirement for the block error rate (BLER).
 Reducing interference
Power control reduces interference in a cell, which mainly comes from neighboring cells.
 Lowering power consumption
Uplink power control lowers the power consumption of UEs, and downlink power control lowers the
power consumption of eNodeBs.
 Expanding coverage and capacity
Downlink power control allocates different power to UEs at different locations to meet requirements for
coverage. In addition, downlink power control reduces the transmit power allocated to each UE to a
minimum, so that the allocated power meets the requirement for the signal to interference plus noise
ratio (SINR). In this way, downlink power control expands system capacity.
Interference to neighboring cells mainly comes from UEs on cell edges. To reduce interference, uplink
power control uses a technique known as Fractional Power Compensation (FPC) to lower the
interference to neighboring cells, increasing network capacity.
This document describes the following features:
 LBFD-002016 Dynamic Downlink Power Allocation
 LBFD-002026 Uplink Power Control
2.1 LBFD-002016 Dynamic Downlink Power Allocation
This feature is basic. Downlink power control is performed on downlink physical signals, traffic channels,
and control channels. It allocates power to the following signals and channels:
 Cell-specific reference signal
 Synchronization signal
 Physical broadcast channel (PBCH)
 Physical control format indicator channel (PCFICH)
 Physical downlink control channel (PDCCH)
 Physical downlink shared channel (PDSCH)
 Physical HARQ indicator channel (PHICH)
Currently, eNodeBs do not support the physical multicast channel (PMCH).

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Power Control 2 Overview of Power Control
2-2
2.2 LBFD-002026 Uplink Power Control
This feature is basic. Uplink power control is performed on uplink physical signals, traffic channels, and
control channels. It controls power of the following signals and channels:
 Physical random access channel (PRACH)
 Physical uplink shared channel (PUSCH)
 Physical uplink control channel (PUCCH)
 Sounding reference signal (SRS)

eRAN
Power Control 3 Downlink Power Control
3-1
3 Downlink Power Control
3.1 Overview
This chapter describes the basic feature LBFD-002016 Dynamic Downlink Power Allocation.
Downlink power control is achieved using either of the following techniques:
 Fixed power assignment
Fixed power assignment is applicable to the cell-specific reference signal, synchronization signal,
PBCH, PCFICH, and the PDCCH and PDSCH that carry common information of the cell. Users
configure fixed power based on channel quality. The configured power must meet the requirements for
the downlink coverage of the cell.
 Dynamic power control
Dynamic power control is applicable to the PHICH and the PDCCH and PDSCH that carry dedicated
information sent to UEs. Dynamic power control lowers interference, expands cell capacity, and
increases coverage while meeting users' quality of service (QoS) requirements.
3.2 Power Allocation for Cell-specific Reference Signals
The cell-specific reference signal is transmitted in all downlink subframes. The signal serves as a basis
for downlink channel estimation, which is used for data demodulation.
The power for the cell-specific reference signal is set using the ReferenceSignalPwr parameter, which
indicates the energy per resource element (EPRE) of the cell-specific reference signal.
3.3 Power Allocation for Synchronization Signals
The synchronization signal is used for cell search and system synchronization. There are two types of
synchronization signals, the primary synchronization channel (P-SCH) and the secondary
synchronization channel (S-SCH).
The offset of the power for the P-SCH and S-SCH against the power for the cell-specific reference signal
is set using the SchPwr parameter.
The transmit power for the P-SCH and S-SCH is calculated using the following formula:
PowerSCH = ReferenceSignalPwr +SchPwr
3.4 Power Allocation for the PBCH
On the PBCH, broadcast messages are sent in each frame. The messages carry the basic system
information of the cell, such as the cell bandwidth, antenna configuration, and frame number.
The offset of the power for the PBCH against the power for the cell-specific reference signal is set using
the PbchPwr parameter.
The transmit power for the PBCH is calculated using the following formula:
PowerPBCH = ReferenceSignalPwr + PbchPwr
3.5 Power Allocation for the PCFICH
The PCFICH carries the number of orthogonal frequency division multiplexing (OFDM) symbols used for
PDCCH transmission in a subframe. The PCFICH is always mapped to the first OFDM symbol of each
subframe.

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The power for the PCFICH is set using the PcfichPwr parameter, which indicates an offset of the power
for the PCFICH against the power for the cell-specific reference signal.
The transmit power for the PCFICH is calculated using the following formula:
PowerPCFICH = ReferenceSignalPwr + PcfichPwr
3.6 Power Allocation for the PDSCH Carrying RACH Response,
Paging Messages, and SIBs
When the PDSCH carries the RACH response, paging messages, and D-BCH (transmitting SIBs),
power control is performed to ensure coverage.
The power for the PDSCH carrying RACH response is set using the RaRspPwr parameter, the power for
the PDSCH carrying paging messages is set using the PchPwr parameter, and the power for the
PDSCH carrying D-BCH is set using the DbchPwr parameter. Each of these three parameters indicates
a power offset against the power for the cell-specific reference signal.
3.7 Power Allocation for the PHICH
The PHICH carries the ACK/NACK information of hybrid automatic repeat request (HARQ). ACK and
NACK are short for acknowledgment and negative acknowledgment, respectively.
A high probability of the UE incorrectly demodulating the PHICH will severely affect user throughput.
Power control ensures the performance of the PHICH for all UEs while meeting the requirements for the
bit error rate (BER).
Power control for the PHICH is set using the DlPcAlgoSwitch parameter.
When the PhichInnerLoopPcSwitch parameter under DlPcAlgoSwitch is set to ON, the transmit
power for the PHICH is periodically adjusted to adapt to change in path loss and shadow fading
according to the difference between the estimated SINRRS and SINRTarget. The SINRRS is estimated
based on the channel quality indicator (CQI). The SINRTarget is a fixed value, which has an impact on the
cell radius, power efficiency, and cell capacity. If SINRRS is less than SINRTarget, transmit power is
increased. Otherwise, transmit power is decreased.
When the PhichInnerLoopPcSwitch parameter under DlPcAlgoSwitch is set to OFF, the power for
PHICH is set using the PwrOffset parameter, which indicates an offset of the power for the PHICH
against the power for the cell-specific reference signal.
3.8 Power Allocation for the PDCCH Carrying Dedicated Control
Information
The dedicated control information carried on the PDCCH is as follows:
 Uplink scheduling information (DCI format 0, where DCI stands for downlink control information)
 Downlink scheduling information (DCI format 1/1A/1B/2/2A)
 PUSCH/PUCCH transmit power control (TPC) commands (DCI format 3/3A)
A high probability of the UE incorrectly demodulating the PDCCH will severely affect user throughput.
Power control ensures the performance of the PDCCH for all UEs while meeting the requirements for the
BLER.
Power control for the PDCCH is set using the DlPcAlgoSwitch parameter.
When the PdcchPcSwitch parameter under DlPcAlgoSwitch is set to ON, the transmit power for the
PDCCH is periodically adjusted according to the difference between the measured BLER and BLERTarget.
If the measured BLER is greater than BLERTarget, transmit power is increased. Otherwise, transmit power

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is decreased. BLERTarget affects single-UE coverage performance and system capacity. Huawei
eNodeBs take the impact on both the performance and capacity into consideration when setting
BLERTarget.
When the PdcchPcSwitch parameter under DlPcAlgoSwitch is set to OFF, the PDCCH uses fixed
power assignment. In this case, the offset of the power for the PDCCH against the power for the
cell-specific reference signal is set using the DediDciPwrOffset parameter.
3.9 Power Allocation for the PDSCH Carrying Information Other
Than RACH Response, Paging Messages, and SIBs
Power control for the PDSCH effectively improves system throughput and spectral efficiency.
Adaptive modulation and coding (AMC) and HARQ also improve system throughput and spectral efficiency. You can use
them in combination with power control.
3.9.1 Basics of PDSCH Power Calculation
In power control for the PDSCH, OFDM symbols in one slot can be classified into type A and type B:
 Type A symbols are those that appear during a symbol period when there is no reference signal.
 Type B symbols are those that appear during a symbol period when there are reference signals.
Table 3-1 lists the OFDM symbol indexes within a slot where the ratio of the corresponding PDSCH
EPRE to the cell-specific reference signal EPRE is denoted by ρA or ρB.
Table 3-1 OFDM symbol indexes
Number of
Antenna Ports
Symbol Indexes Where the Ratio Is
Denoted by ρA
Symbol Indexes Where the Ratio Is
Denoted by ρB
Normal Cyclic
Prefix
Extended Cyclic Prefix Normal Cyclic Prefix Extended Cyclic
Prefix
One or two 1, 2, 3, 5, 6 1, 2, 4, 5 0, 4 0, 3
Four 2, 3, 5, 6 2, 4, 5 0, 1, 4 0, 1, 3
Power control for the PDSCH determines the EPREs of different OFDM symbols by using ρA and ρB. ρA
is used to determine the PDSCH EPRE for symbol type A, and ρB is used to determine the PDSCH
EPRE for symbol type B.
The transmit power for the two types of OFDM symbols on the PDSCH is defined by PPDSCH_A and
PPDSCH_B. The calculation formulas are as follows:
 PPDSCH_A = ρA + ReferenceSignalPwr
 PPDSCH_B = ρB + ReferenceSignalPwr
ρA = PA. PA is sent to the UE by means of RRC signaling for PDSCH demodulation.
ρB depends on the power factor ratio ρB/ρA. Table 3-2 lists the values of the cell-specific ratio ρB/ρA
corresponding to different PB values in scenarios with different quantities of antenna ports. PB is set
using the Pb parameter.

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Table 3-2 Values of the cell-specific ratio ρB/ρA for different PB values and quantities of antenna ports
PB ρB/ρA
One Antenna Port Two or Four Antenna Ports
0 1 5/4
1 4/5 1
2 3/5 3/4
3 2/5 1/2
Power control for the PDSCH is performed to determine PA for each UE.
3.9.2 Power Control Mechanism for the PDSCH
Power control for the PDSCH is related to the settings of the DlIcicSwitch parameter and the switch for
the downlink inter-cell interference coordination (ICIC). Power control for the PDSCH is set using the
DlPcAlgoSwitch parameter, as described in Table 3-3.
Table 3-3 Power control mechanism for the PDSCH
Switch Setting Power Control Mechanism for the PDSCH
The DlIcicSwitch parameter is set to
DlIcicDynamicSwitch_ON_ENUM or
DlIcicStaticSwitch_ON_ENUM, indicating that
downlink ICIC is enabled.
PA is set using the CcuPa and CeuPa parameters
for the cell center user (CCU) and cell edge user
(CEU), respectively. In this way, transmit power is
determined.
Dynamic power adjustment is not performed for
the PDSCH.
The DlIcicSwitch parameter is set to
DlIcicSwitch_OFF_ENUM or
DlIcicReuse3Switch_ON_ENUM, indicating that
downlink ICIC is disabled.
Dynamic power adjustment for the PDSCH is
performed. For details, see section 3.9.3 "PDSCH
Power Adjustment."
 The DlIcicSwitch parameter is set to
DlIcicSwitch_OFF_ENUM or
DlIcicReuse3Switch_ON_ENUM, indicating that
downlink ICIC is disabled.
 The PdschSpsPcSwitch parameter under
DlPcAlgoSwitch and the PdschPaAdjSwitch
parameter are set to OFF.
Power control for the PDSCH uses fixed power
assignment. PA is set using the PaPcOff
parameter.
3.9.3 PDSCH Power Adjustment
During service provision, the PDSCH power adjustment algorithm tracks path loss and shadow fading
and periodically and dynamically adjusts the transmit power to meet the requirements for channel quality.
This is the purpose of PDSCH power adjustment.

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Based on the service types carried on the PDSCH, scheduling on the PDSCH consists of dynamic
scheduling and semi-persistent scheduling. Power control for the PDSCH uses different mechanisms for
these two scheduling modes.
Power Control for the PDSCH in Dynamic Scheduling Mode
The power for the PDSCH is determined and dynamically adjusted based on PA when the
PdschPaAdjSwitch parameter is set to ON. PPDSCH_A and PPDSCH_B, the initial transmit power for the
PDSCH, are calculated as follows:
1. The eNodeB uses the CQI to estimate the SINRRS of the cell-specific reference signal. If no CQI is
reported, the default SINRRS_Initial value of the system is used.
2. The transmission block (TB) size of the UE is estimated based on the QoS information related to the
UE, including the Guaranteed Bit Rate (GBR) and Aggregate Maximum Bit Rate (AMBR).
3. Under the precondition that the service requirements of the UE are met and a balance is achieved
between the power usage efficiency and resource block (RB) usage efficiency in the system, the
initial CQITarget is calculated based on the estimated SINRRS and the TB size.
4. The initial power offset for the PDSCH, namely, PO_PDSCH, is calculated based on the estimated
SINRRS and CQITarget.
5. As indicated in 3GPP TS 36.331, PA is a discrete enumerated value whose value range is {−6, −4.77,
–3, −1.77, 0, 1, 2, 3}. Therefore, PO_PDSCH needs to be mapped to PA.
6. The initial transmit power for the PDSCH, namely, PPDSCH_A and PPDSCH_B, is calculated based on PA.
Figure 3-1 shows the process for calculating the initial PA value.
Figure 3-1 Process for calculating the initial PA value

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When the eNodeB receives a CQI reported by the UE, it compares the reported CQI with the previous
CQI. If the difference between the two CQI values is great, the process for re-calculating the PA for the
UE is started. For details, see Figure 3-1.
Power Control for the PDSCH in Semi-Persistent Scheduling Mode
In semi-persistent scheduling, power control for the PDSCH is set using the DlPcAlgoSwitch parameter.
When the PdschSpsPcSwitch parameter under DlPcAlgoSwitch is set to ON, the RB resources
occupied by the PDSCH for a UE are fixed, and the modulation and coding scheme (MCS) is also fixed.
Based on the difference between the measured Initial Block Error Rate (IBLER) of voice over IP (VoIP)
packets and IBLERTarget, the transmit power for the PDSCH is periodically adjusted to meet the
requirements for IBLERTarget. If the measured IBLER is less than IBLERTarget, transmit power is
decreased. Otherwise, transmit power is increased.

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Power Control 4 Uplink Power Control
4-1
4 Uplink Power Control
4.1 Overview
This section describes the basic principles of power control for the PUSCH and PUCCH. The basic
feature involved is LBFD-002026 Uplink Power Control.
Power control for the SRS and PRACH is not conventional. In addition, the power for the SRS is determined by the result
of power control for the PUSCH. Therefore, this section does not describe power control for the SRS and PRACH. For
related descriptions, see section 4.2 "Power Control for the PRACH" and section 4.5 "Power Control for Sounding
Reference Signals."
Power control for the PUSCH and PUCCH how the eNodeB adjusts the transmit power of UEs by means
of TPCs.
Based on the power control parameter settings, interference to neighboring cells, and the results of
uplink data transmission measurement performed by the eNodeB, the uplink power control algorithm
calculates the TPC of a UE and sends the TPC to the UE by means of the PDCCH. Based on the
mapping method defined by 3GPP TS 36.213, the UE converts the TPC to the power adjustment value.
Then, the UE determines its transmit power based on factors such as the power adjustment value, its
own maximum transmit power, the nominal power of the cell, the path loss, the MCS, and radio
resources. By adjusting the TPC, power control enables the transmission performance of radio link to
converge to the target value. In addition, TPC adjustment suppresses the inter-cell interference.
4.2 Power Control for the PRACH
The purpose of power control for the PRACH is to ensure the random access success rate while
minimizing transmit power.
4.2.1 Basics of PRACH Power Calculation
The PRACH power is calculated using the following formula:
})1(,min{ _ stepprepreamblepreoCMAXPRACH NPLPPP 
where
 CMAXP is the maximum transmit power of the UE.
 preoP _ is the target power expected by the eNodeB when the requirements for the preamble detection
performance are met and the PRACH preamble format is 0. The initial value of preoP _ is set using the
PreambInitRcvTargetPwr parameter.
 PL is the downlink path loss estimated by the UE. This value is obtained based on the reference
signal received power (RSRP) measurement value and the transmit power for the cell-specific
reference signal. The transmit power for cell-specific reference signals is set using the
ReferenceSignalPwr parameter. The Alpha filtering coefficient for filtering the RSRP measurement
values is set using the FilterRsrp parameter. The UE acquires the two parameters from SIBs.
 preamble is the offset of the power for the current preamble format against preamble format 0.
 preN is the number of times the UE sends the preamble. This value cannot exceed the maximum
number of preamble transmissions.
 step is the preamble power ramping step. This value is set using the PwrRampingStep parameter.

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The eNodeB sends preoP _ and step to a UE by broadcasting system information, and the UE
calculates the transmit power for the random access preamble based on preoP _ , step , PL, and the
recorded preN .
4.2.2 preoP _ Setting by the eNodeB
The eNodeB sets the value of preoP _ using the PreambInitRcvTargetPwr parameter. If this parameter
is set to a small value, the probability that a preamble is correctly decoded decreases. If this parameter is
set to a large value, interference to neighboring cells increases.
4.2.3 PRACH Power Ramping for the UE
If random access by the UE fails before reaching the maximum number of preamble transmissions,
PRACH power ramping is performed, and the preamble is retransmitted. The PRACH power ramping
process is as follows:
1. The UE sends a random access preamble.
2. If the eNodeB correctly detects this preamble, it sends a random access response.
3. If a random access response is not correctly detected, the UE accumulates preN
, recalculates the
transmit power, and selects another random access preamble.
4.3 Power Control for the PUSCH
The purposes of power control for the PUSCH are as follows:
 Lowering interference to neighboring cells and increasing cell throughput
 Ensuring services rates for users on cell edges
4.3.1 Basics of PUSCH Power Calculation
For each UE, the transmit power for the PUSCH is calculated using the following formula:
)}()())(log(10,min{)( _ ifiPLPiMPiP TFPUSCHoPUSCHCMAXPUSCH  
where
 i is the subframe number (for example, when i = 9, i is the ninth uplink subframe).
 )(iMPUSCH is the PUSCH transmission bandwidth on the ith uplink subframe.
 PUSCHoP _ is the receive power expected by the eNodeB.
  is the path loss compensation factor.  is set using the PassLossCoeff parameter.
 PL is the downlink path loss estimated by the UE. For details, see section 4.2.1 "Basics of PRACH
Power Calculation."
 )(iTF is the offset of the power for the current MCS format against the reference MCS format. If the
DeltaMcsEnabled parameter is set to 0, )(iTF is 0. Otherwise, the impact of )(iTF is
considered.

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4-3
 )(if is the adjustment of the PUSCH transmit power of the UE. This value is obtained based on the
TPC information on the PDCCH.
PUSCHoP _ is determined by the eNodeB and reflects the receive power density expected by the eNodeB
when the requirements for the PUSCH demodulation performance are met. The calculation formula is as
follows:
PUSCHUEoPUSCHNOMINALoPUSCHo PPP _____ 
where
 PUSCHNOMINALoP __ is the transmit power density for the PUSCH expected by the eNodeB when the
correct PUSCH demodulation is ensured. PUSCHNOMINALoP __ is set using the P0NominalPUSCH
parameter.
 PUSCHUEoP __ is the offset of the power for the UE against PUSCHNOMINALoP __ . This value reflects the
impact of the UE level, service type, and channel quality on the transmit power for the PUSCH.
4.3.2 Initial Power Setting for the PUSCH by the eNodeB
In the initial stages after a UE accesses the network or is handed over to another cell, the measurement
values required for power control may not be obtained. At this time, the transmit power density for the
PUSCH needs to be set based on PUSCHNOMINALoP __ and  , which are the nominal power for the cell
and the path loss compensation factor, respectively. In this way, the UE on a cell edge can successfully
access the network and maintain the service. PUSCHNOMINALoP __ and  affect the transmit power
density. Small values of these two factors result in a decrease in the access success rate and service
rate. Large values cause an increase in the transmit power in the early phase after UE access and also
cause the interference to neighboring cells.
4.3.3 Transmit Power Adjustment for the PUSCH by the eNodeB
During service provision, path loss and shadow fading need to be tracked and the transmit power
density needs to be dynamically adjusted. The purposes of power adjustment for the PUSCH are to
meet service quality requirements, reduce transmit power, lower interference to neighboring cells, and
increase system capacity.
Based on the service types carried on the PUSCH, scheduling on the PUSCH consists of dynamic
scheduling and semi-persistent scheduling. Power control for the PUSCH uses different mechanisms for
these two scheduling modes.
In dynamic scheduling, power control for the PUSCH is set using the UlPcAlgoSwitch parameter. The
principles are as follows:
When the InnerLoopPuschSwitch parameter under UlPcAlgoSwitch is set to ON, the eNodeB
estimates the transmit power density of the UE and then periodically adjusts the transmit power for the
PUSCH to adapt to change in the channel environment and traffic load based on the difference between
the estimated transmit power density and the target transmit power density. If the estimated transmit
power density is greater than the target transmit power density, the eNodeB sends a TPC command,
ordering a decrease in transmit power. If the estimated transmit power density is less than the target
transmit power density, the eNodeB sends a TPC command, ordering an increase in transmit power.
The transmit power density in the E-UTRAN system refers to the transmit power of an RB.

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4-4
In semi-persistent scheduling, power control for the PUSCH is set using the UlPcAlgoSwitch parameter.
The principles are as follows:
When the CloseLoopSpsSwitch parameter under UlPcAlgoSwitch is set to ON, the transmit power for
the PUSCH is periodically adjusted to adapt to change in the channel environment based on the
difference between the measured IBLER and IBLERTarget:
 If the measured IBLER is greater than IBLERTarget, the eNodeB sends a TPC command to the UE,
ordering an increase in transmit power.
 If the measured IBLER is less than IBLERTarget, the eNodeB sends a TPC command to the UE,
ordering a decrease in transmit power.
The value of IBLERTarget is determined based on the requirement of the service in semi-persistent
scheduling.
The PUSCH TPCs of multiple UEs in semi-persistent scheduling are sent to the UEs in DCI format 3/3A.
In this way, signaling overheads on the PDCCH are reduced.
4.3.4 Msg3 Power Control in Random Access
When the PUSCH carries Msg3, the transmit power of each UE's PUSCH is calculated using the
following formula:
)}()())(log(10,min{)( 3_O_pre ifiPLPiMPiP TFMsgPREAMBLEPUSCHCMAXPUSCH 
where
 )(iMPUSCH is the PUSCH transmission bandwidth on the ith uplink subframe.
 preoP _ is the target power expected by the eNodeB when the requirements for the preamble detection
performance are met and the PRACH preamble format is 0.
 3_ MsgPREAMBLE is the preamble delta value of Msg3. This value is set using the DeltaPreambleMsg3
parameter.
 PL is the downlink path loss estimated by the UE. For details, see section 4.2.1 "Basics of PRACH
Power Calculation."
 )(iTF is the offset of the power for the current MCS format against the reference MCS format. For
details, see section 4.3.1 "Basics of PUSCH Power Calculation."
 )(if is the adjustment of the PUSCH transmit power of the UE. This value is obtained based on the
TPC information on the PDCCH.
The transmit power for Msg3 is determined based on preoP _ and the parameters related to power
control for the PUSCH. For details about preoP _ , see section 4.2 "Power Control for the PRACH "
4.4 Power Control for the PUCCH
The PUCCH carries the ACK/NACK information, CQIs, and schedule request (SR) information related to
downlink data. When the probability of incorrect demodulation on the PUCCH is high, user throughput is
severely affected.

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4-5
The purposes of power control for the PUCCH are to ensure the PUCCH performance and reduce the
interference to neighboring cells.
4.4.1 Basics of PUCCH Power Calculation
The transmit power for the PUCCH is calculated using the following formula:
  )}()(,nh,min{)( _CQI_0 igFnPLPPiP PUCCHFHARQPUCCHCMAXPUCCH 
where
 PUCCHP _0 is the receive power expected by the eNodeB.
 PL is the downlink path loss estimated by the UE. This value is obtained based on the measured
RSRP and the transmit power for the cell-specific reference signal. The Alpha filtering coefficient for
filtering the RSRP measurement values is set using the FilterRsrp parameter.
  HARQn,nh CQI is determined by the PUCCH format. nCQI is the number of information bits of the CQI,
and it reflects the impact of the number of CQI bits of the PUCCH on the power. nHARQ is the number of
information bits of HARQ, and it reflects the impact of the number of HARQ signaling bits of the
PUCCH on the power.
 )(_ FPUCCHF reflects the transmission format of the PUCCH on the transmit power. It is set using the
DeltaFPUCCHFormat1, DeltaFPUCCHFormat1b, DeltaFPUCCHFormat2,
DeltaFPUCCHFormat2a, and DeltaFPUCCHFormat2b parameters.
 )(ig is the adjustment of the transmit power of the UE's PUCCH, and it is obtained based on the TPC
information on the PDCCH.
PUCCHP _0 is determined by the eNodeB and is the receive power expected by the eNodeB when the
requirements for the PUCCH demodulation performance are met. The calculation formula is as follows:
PUCCHUEoPUCCHNOMINALoPUCCHo PPP _____ 
where
 PUCCHNOMINALoP __ is the target signal power expected by the eNodeB for the reference transmission
format. PUCCHNOMINALoP __ is set using the P0NominalPUCCH parameter.
 PUCCHUEoP __ is the offset of the power for the UE against PUCCHNOMINALoP __ . This value reflects the
impact of the UE level, service type, and channel quality on the transmit power for the PUCCH.
4.4.2 Initial Power Setting for the PUCCH by the eNodeB
In the initial stages after a UE accesses the network or is handed over to another cell, the transmit power
for the PUCCH is set using the nominal power PUCCHNOMINALoP __ . This ensures that UEs on the cell
edge can successfully attach to the network.

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4-6
4.4.3 Transmit Power Adjustment for the PUCCH by the eNodeB
During service provision, path loss and shadow fading need to be tracked and the transmit power needs
to be periodically and dynamically adjusted to meet the requirements for channel quality. This is the
purpose of PUCCH power adjustment.
Power control for the PUCCH is set using the UlPcAlgoSwitch parameter. The principles are as follows:
When the InnerLoopPucchSwitch parameter under UlPcAlgoSwitch is set to ON, the transmit power
for the PUCCH is periodically adjusted to adapt to change in the channel environment based on the
difference between the measured SINR and SINRTarget:
 If the measured SINR is greater than SINRTarget, the eNodeB sends a TPC command to the UE,
ordering an increase in transmit power.
 If the measured SINR is less than SINRTarget, the eNodeB sends a TPC command to the UE, ordering
a decrease in transmit power.
The value of SINRTarget is determined based on the BLER requirements in different PUCCH formats and
the decoding capability of the eNodeB.
The PUCCH TPCs of multiple UEs in semi-persistent scheduling are sent to the UEs in DCI format 3/3A.
This reduces signaling overheads on the PDCCH.
4.5 Power Control for Sounding Reference Signals
The SRS is used for uplink channel estimation and uplink timing. Power control for the SRS ensures the
accuracy in uplink channel estimation and uplink timing.
4.5.1 Basics of SRS Power Calculation
The SRS power is calculated using the following formula:
)}()log(10,min{)( _0_CMAX ifPLPPMPiP PUSCHOFFSETSRSSRSSRS  
where
 SRSM is the transmission bandwidth of the SRS.
 OFFSETSRSP _ is the offset of the SRS power against the PUSCH power. This value is set using the
PsrsOffsetDeltaMcsDisable or PSrsOffsetDeltaMcsEnable parameters based on different
DeltaMcsEnabled values.
 PUSCHoP _ is the value in dynamic scheduling for the PUSCH.
  is the path loss compensation factor, and it is set using the PassLossCoeff parameter.
 PL is the downlink path loss estimated by the UE. This value is calculated based on the measured
RSRP value and the transmit power for the cell-specific reference signal. The Alpha filtering coefficient
for filtering the RSRP measurement values is set using the FilterRsrp parameter.
 )(if is the adjustment of the transmit power of the UE's PUSCH, and it is obtained based on the TPC
information on the PDCCH.

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4-7
4.5.2 SRS Transmit Power Setting by the eNodeB
The transmit power for the SRS is determined based on the configured SRS power offset, resource
amount, and the parameters related to power control for the PUSCH, namely, PUSCHoP _ and )(if .

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Power Control 5 Related Features
5-1
5 Related Features
Power control involves the basic features LBFD-002016 Dynamic Downlink Power Allocation and
LBFD-002026 Uplink Power Control. This chapter describes their relationships with other features.
5.1 Downlink Power Control
Downlink power control is related to the following features:
 LBFD-002025 Basic Scheduling
 LOFD-00101502 Dynamic Scheduling
 LOFD-00101501 CQI Adjustment
 LOFD-001016 VoIP Semi-persistent Scheduling
 LBFD-00202201 Downlink Static Inter-Cell Interference Coordination
 LOFD-00101401 Downlink Dynamic Inter-Cell Interference Coordination
Figure 5-1 shows the interactions between downlink power control and downlink CQI adjustment,
downlink ICIC, and downlink scheduling.
Figure 5-1 Interactions between downlink power control and other algorithms
5.1.1 Required Features
The following features are required for downlink power control:
 LBFD-002025 Basic Scheduling and LOFD-00101502 Dynamic Scheduling
Downlink power control depends on downlink scheduling because the downlink scheduling algorithm
provides the downlink power control algorithm with information such as the PDCCH DCI format, type
of information carried on the PDSCH, and QoS of UEs.
 LOFD-00101501 CQI Adjustment
The CQI adjustment algorithm provides the adjusted CQI for the downlink power control algorithm.
The VoIP semi-persistent scheduling algorithm provides the downlink power control algorithm with the
BLER that is reached in semi-persistent scheduling mode. The BLER is a prerequisite for enabling
PDSCH power adjustment in semi-persistent scheduling.
 LBFD-00202201 Downlink Static Inter-Cell Interference Coordination and LOFD-00101401 Downlink
Dynamic Inter-Cell Interference Coordination
The downlink ICIC algorithm provides the downlink power control algorithm with the ICIC switch status
and UE types (CCU or CEU).

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5-2
5.1.2 Mutually Exclusive Features
Downlink power control is basic for eNodeBs. There are no mutually exclusive features.
5.1.3 Affected Features
If downlink semi-persistent scheduling is enabled, it is recommended that PdschSpsPcSwitch be
turned on to enable power control for the PDSCH in semi-persistent scheduling mode.
If the PDSCH power adjustment switch (specified by PdschPaAdjSwitch) is turned on, it is
recommended that CqiAdjAlgoSwitch also be turned on to enable CQI adjustment.
5.2 Uplink Power Control
Uplink power control is related to the following features:
 LBFD-002025 Basic Scheduling
 LOFD-00101502 Dynamic Scheduling
 LBFD-002010 Random Access Procedure
Figure 5-2 shows the interactions between uplink power control and uplink scheduling as well as the
random access procedure.
Figure 5-2 Interactions between uplink power control and other algorithms
PH: power headroom TBS: transport block size
5.2.1 Required Features
The following features are required for uplink power control:
 LBFD-002025 Basic Scheduling and LOFD-00101502 Dynamic Scheduling
The uplink power control algorithm provides the uplink scheduling algorithm with the power headroom
for the UE. Based on the power headroom, the scheduler determines an MCS and the number of RBs
for the UE to maximize system throughput while meeting the QoS requirements of the UE.
The uplink scheduling algorithm provides the uplink power control algorithm with the TBS and the
number of allocated RBs. UE power is set based on this algorithm.
In addition, the uplink scheduling algorithm provides information such as the PUCCH format and SRS
resource amount for related power setting.
The VoIP semi-persistent scheduling algorithm provides the uplink power control algorithm with the
BLER that is reached in semi-persistent scheduling mode. The BLER is a prerequisite for enabling
PUSCH power adjustment in semi-persistent scheduling.
 LBFD-002010 Random Access Procedure
The random access procedure provides the uplink power control algorithm with information such as
the preamble format and the number of times the UE sends the preamble. Based on this information,

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5-3
the uplink power control algorithm maintains the transmit power of the UE above the required level
during the random access procedure.
5.2.2 Mutually Exclusive Features
Uplink power control is basic for eNodeBs. There are no mutually exclusive features.
5.2.3 Affected Features
None

eRAN
Power Control 6 Impact on the Network
6-1
6 Impact on the Network
This chapter describes the impact of power control on system capacity and network performance.
6.1 Downlink Power Control
This section describes the impact of downlink power control, which involves channels such as the
PDSCH, PDCCH, PCFICH, and PHICH.
6.1.1 Impact on System Capacity
Power control for the PDSCH has an immediate impact on downlink system capacity. The settings of PA,
PB, and power for cell-specific reference signals all affect cell throughput. These settings determine the
total power used in a cell. Large values result in high interference to neighboring cells, and small values
cause a waste of power, less coverage, and reduced throughput.
Good performance of the PCFICH, PHICH, and PDCCH guarantees basic functionality of the system.
Power control for these channels affects channel reliability, and channel reliability in turn affects various
performance indicators:
 Power control for the PCFICH has an impact on PDCCH demodulation and uplink and downlink
throughput.
 Power control for the PHICH has an impact on uplink ACK/NACK demodulation and uplink HARQ and
therefore affects indicators such as uplink throughput and latency.
 The PDCCH carries UE-specific information. Power control for the PDCCH has an impact on
indicators such as uplink and downlink throughput and latency.
6.1.2 Impact on Network Performance
Downlink power control has an impact on key performance indicators (KPIs) in the following aspects:
 Access success rate
Downlink power control affects message transmission reliability during the access procedure. The
power offsets for downlink channels affect the network coverage for access. To enhance coverage,
ensure that the coverage levels of uplink and downlink channels are the same.
 Handover success rate
For example, power control for the PDCCH and PDSCH affects delivery of handover commands. This
has an impact on the handover success rate.
 Service drop rate
For example, power control for the PDCCH affects PDCCH reliability and further affects transmission
on other uplink and downlink channels. This has an impact on the service drop rate.
6.2 Uplink Power Control
This section describes the impact of uplink power control, which involves channels such as the PUSCH,
PUCCH, and PRACH.
6.2.1 Impact on System Capacity
Uplink power control has an impact on system capacity in following aspects:
 Power control for the PUSCH determines the transmit power of each UE and the number of RBs
allocated for uplink transmission. Therefore, it has an immediate impact on uplink system capacity.

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Power Control 6 Impact on the Network
6-2
 Power control for the PUCCH affects the reliability of uplink control information transmission. The
control information includes ACKs/NACKs. Therefore, the power control has an impact on downlink
throughput.
 Power control for SRS affects the accuracy of timing advance and SINR measurements and has an
impact on the performance of functions such as AMC. Therefore, the power control affects system
throughput.
6.2.2 Impact on Network Performance
Uplink power control has an impact on KPIs in the following aspects:
 Access success rate
Uplink power control affects message transmission reliability during the access procedure.
In addition, uplink power control determines the coverage levels of channels and affects the network
coverage for access. To enhance coverage, ensure that the coverage levels of uplink and downlink
channels are the same.
 Handover success rate
For example, power control for the PUSCH and PUCCH affects measurement reporting; power control
for the PRACH, PUSCH, and PUCCH affects the random access procedure.
 Service drop rate
For example, power control for the PUSCH and PUCCH affects transmission reliability on uplink
channels. This has an impact on the service drop rate.

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Power Control 7 Engineering Guidelines
7-1
7 Engineering Guidelines
This chapter provides engineering guidelines for power control.
7.1 When to Use Power Control
7.1.1 Downlink Power Control
This section describes when to use downlink power control.
Dynamic Power Adjustment for the PHICH
It is recommended that dynamic power adjustment for the PHICH (controlled by
PhichInnerLoopPcSwitch) be disabled to use fixed power allocation for the PHICH. This is because
the default value of the PHICH power offset can satisfy PHICH demodulation and the dynamic power
adjustment brings little gain.
Power Control for the PDCCH Carrying Dedicated Control Information
It is recommended that dynamic power adjustment for the PDCCH (controlled by PdcchPcSwitch) be
enabled to reduce the service drop rate and increase the throughput for CEUs.
Pa Adjustment for the PDSCH in Dynamic Scheduling Mode
It is recommended that Pa adjustment for the PDSCH in dynamic scheduling mode (controlled by
PdschPaAdjSwitch) be disabled to use fixed power allocation for the PDSCH. This is because the Pa
adjustment brings gains in only few scenarios.
The setting of PdschPaAdjSwitch takes effect only when downlink ICIC is disabled.
It is recommended that power control for the PDSCH in semi-persistent scheduling mode (controlled by
PdschSpsPcSwitch) be disabled to use fixed power allocation for the PDSCH. This is because the
power control brings gains in only few scenarios.
The setting of PdschSpsPcSwitch takes effect only when downlink ICIC is disabled.
7.1.2 Uplink Power Control
This section describes when to use uplink power control.
Delta-MCS Switch in Power Control for the PUSCH
It is recommended that the delta-MCS switch (specified by DeltaMcsEnabled) be turned off so that delta
MCS is not used in power control for the PUSCH. This is because eNodeBs currently can dynamically
adjust the transmit power of UEs by sending commands based on MCSs.
Inner-Loop Power Control for the PUSCH in Dynamic Scheduling Mode
It is recommended that inner-loop power control for the PUSCH in dynamic scheduling mode (controlled
by InnerLoopPuschSwitch) be enabled to achieve higher CEU throughput and fairness between users.

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7-2
Closed-Loop Power Control for the PUSCH in Semi-Persistent Scheduling
Mode
It is recommended that power control for the PUSCH in semi-persistent scheduling mode (controlled by
CloseLoopSpsSwitch) be enabled or disabled as follows:
 Enable power control if uplink semi-persistent scheduling is enabled. In this situation, TPC commands
are adjusted based on correctness of the received initial-transmission data packets to decrease the
IBLER, improving VoIP service performance.
 Disable power control if uplink semi-persistent scheduling is disabled.
If the power control described in this section is enabled, it is recommended that inner-loop power control for the PUSCH in
dynamic scheduling mode also be enabled.
Inner-Loop Power Control for the PUCCH
It is recommended that inner-loop power control for the PUCCH (controlled by InnerLoopPucchSwitch)
be enabled to ensure PUCCH signal quality.
7.2 Information to Be Collected
None
7.3 Network Planning
None
7.4 Deploying Downlink Power Control
7.4.1 Deployment Requirements
Downlink power control has no requirement for the operating environment, transmission networking, and
licenses.
7.4.2 Data Preparation
This section describes generic data and scenario-specific data to be collected. Generic data is
necessary for all scenarios and must always be collected. Scenario-specific data is collected only when
necessary for a specific scenario.
There are three types of data sources:
 Network plan (negotiation required): Parameters are planned by operators and negotiated with the
EPC or peer transmission equipment.
 Network plan (negotiation not required): Parameters are planned and set by operators.
 User-defined: Parameters are set as required by users.
Generic Data
Power Settings for Cell-specific Reference Signals
The following table describes the parameters that must be set in the PDSCHCfg managed object (MO)
to configure the cell-specific reference signal power.

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7-3
Parameter
Name
Parameter ID Source Setting Description
Local cell ID PDSCHCfg.Lo
calCellId
Network plan
(negotiation
not required)
Set this parameter based on the network plan.
This parameter specifies the local identity of a
cell. Ensure that this parameter has been set
in the related Cell MO.
Reference signal
power
PDSCHCfg.Ref
erenceSignalP
wr
Network plan
(negotiation
not required)
Set this parameter based on the network plan
during eNodeB deployment. Reference signal
power is used for cell identification, channel
estimation, path loss estimation, and handover
measurement. Reference signal power serves
as a benchmark for channel powers.
Power Settings for Synchronization Signals
The following table describes the parameters that must be set in the CellChPwrCfg MO to configure the
synchronization signal power.
Parameter
Name
Local cell ID CellChPwrCfg.
LocalCellId
Network plan
(negotiation
not required)
SCH power SchPwr Network plan
(negotiation
not required)
This parameter specifies the offset of the
synchronization signal power relative to the
reference signal power specified by
ReferenceSignalPwr.
The value 0 is recommended.
Power Settings for the PBCH
PBCH power.
Parameter
Name
Local cell ID CellChPwrCfg.LocalCellId Network
plan
(negotiation
not
required)
Set this parameter based on the network
plan. This parameter specifies the local
identity of a cell. Ensure that this
parameter has been set in the related
Cell MO.

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7-4
Parameter
Name
PBCH power PbchPwr Network
plan
(negotiation
not
required)
PBCH power relative to the reference
signal power specified by
ReferenceSignalPwr.
The value -600 is recommended for
common scenarios and peak rate tests.
The value 0 is recommended for the tests
on the maximum cell radius.
Power Settings for the PCFICH
PCFICH power.
Parameter
Name
plan
(negotiation
not
required)
Cell MO.
PCFICH
power
PcfichPwr Network
plan
(negotiation
not
required)
PCFICH power relative to the reference
ReferenceSignalPwr.
frequency division duplex (FDD) cells.
Power Settings for the PHICH
PHICH power offset when power control is disabled for the PHICH.
Parameter
Name
plan
(negotiation
not
required)
Cell MO.

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7-5
Parameter
Name
Phich Pc Off
Power Offset
PwrOffset Network
plan
(negotiation
not
required)
PHICH power relative to the reference
ReferenceSignalPwr when
PhichInnerLoopPcSwitch under the
DlPcAlgoSwitch parameter is turned off.
The value 0 is recommended.
The following table describes the parameters that must be set in the CellAlgoSwitch MO to configure
the PHICH inner-loop power control switch.
Parameter
Name
Local cell ID CellAlgoSwitc
h.LocalCellId
Network plan
(negotiation
not required)
Downlink power
control algorithm
switch
DlPcAlgoSwit
ch
Network plan
(negotiation
not required)
This parameter specifies the switches used to
enable or disable power control for the
PDSCH, PDCCH, and PHICH.
PhichInnerLoopPcSwitch under this
parameter specifies the PHICH inner-loop
power control switch. If this switch is turned
off, the initial PHICH transmit power must be
set. If this switch is turned on, the eNodeB
adjusts the PHICH transmit power to enable
the actual receiver SINR to converge on the
target SINR. It is recommended that this
switch be turned off.
Power Settings for the PDCCH Carrying Dedicated Control Information
The following table describes the parameters that must be set in the CellDlpcPdcch MO to configure the
power offset for the PDCCH that carries dedicated control information.
Parameter
Name
Local cell ID CellDlpcPdcc
h.LocalCellId
Network plan
(negotiation
not required)

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7-6
Parameter
Name
DCI power offset
for dedicated
control
DediDciPwrOf
fset
Network plan
(negotiation
not required)
PDCCH power relative to the reference signal
power specified by ReferenceSignalPwr
when the PDCCH carries dedicated control
information and PdcchPcSwitch under the
DlPcAlgoSwitch parameter is turned off.
The value -30 (corresponding to -3 dB) is
recommended.
the PDCCH power control switch.
Parameter
Name
h.LocalCellId
Network plan
(negotiation
not required)
Downlink power
control algorithm
switch
DlPcAlgoSwit
ch
Network plan
(negotiation
not required)
PdcchPcSwitch under this parameter
specifies the PDCCH power control switch. If
this switch is turned off, power is evenly
allocated to the PDCCH. If this switch is turned
on, the PDCCH power is dynamically adjusted.
It is recommended that this switch be turned
on.
Power Settings for the PDSCH Carrying Information Other Than RACH Response, Paging
Messages, and SIBs
The following table describes the parameters that must be set in the CellDlpcPdschPa MO to configure
the Pa adjustment switch.
Parameter
Name
Local cell ID CellDlpcPdsch
Pa.LocalCellId
Network plan
(negotiation
not required)

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7-7
Parameter
Name
PA adjusting
switch
PdschPaAdjS
witch
Network plan
(negotiation
not required)
This parameter specifies the switch for
adjusting Pa through power control for the
PDSCH in dynamic scheduling mode. If this
parameter is set to ON(On), Pa is adjusted
dynamically when the channel quality is either
extremely good or bad.
The value OFF(Off) is recommended.
the switch for PDSCH power control during semi-persistent scheduling.
Parameter
Name
h.LocalCellId
Network plan
(negotiation
not required)
Downlink power
control algorithm
switch
DlPcAlgoSwit
ch
Network plan
(negotiation
not required)
PdschSpsPcSwitch under this parameter
specifies the switch for PDSCH power control
in semi-persistent scheduling mode. If this
switch is turned off, power is evenly allocated
to the PDSCH in semi-persistent scheduling
mode. If this switch is turned on, power control
is applied to the PDSCH in semi-persistent
scheduling mode, ensuring communication
quality (indicated by IBLER) of VoIP services
when the QPSK modulation scheme is used. It
is recommended that this switch be turned off.
The following table describes the parameters that must be set in the PDSCHCfg MO to configure PB.
Parameter
Name
Local cell ID PDSCHCfg.LocalCellId Network
plan
(negotiation
not
required)
identity of a cell. Ensure that this parameter
has been set in the related Cell MO.

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Parameter
Name
Pb Pb Network
plan
(negotiation
not
required)
This parameter specifies PB, which is the
index of a power factor ratio related to the
Energy Per Resource Element (EPRE) on
the PDSCH. This factor is determined by
the value of this parameter and the number
of antenna ports.
The value 0 is recommended for
single-antenna configurations. The value 1
is recommended for dual-antenna
configurations.
Power Settings for the PDSCH Carrying RACH Response, Paging Messages, and SIBs
The following table describes the parameters that must be set in the CellChPwrCfg MO to configure
power offsets for the PDSCH that carries RACH response, paging messages, and SIBs.
Parameter
Name
plan
(negotiation
not
required)
Cell MO.
DBCH power DbchPwr Network
plan
(negotiation
not
required)
power for broadcast information on the
PDSCH relative to the reference signal
power specified by
ReferenceSignalPwr.
common scenarios and peak rate tests.
The value 0 is recommended for the tests
on the maximum cell radius.
PCH power PchPwr Network
plan
(negotiation
not
required)
power for paging information on the
PDSCH relative to the reference signal
power specified by
ReferenceSignalPwr.
The value 0 (corresponding to 0 dB) is
recommended.
Rach
response
power
RaRspPwr Network
plan
(negotiation
not
required)
power for random access responses on
the PDSCH relative to the reference
ReferenceSignalPwr.
The value 0 (corresponding to 0 dB) is
recommended.

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Scenario-specific Data
Scenario 1: Downlink ICIC Disabled
The following table describes the parameters that must be set in the CellDlpcPdschPa MO to configure
Pa for PDSCH power control.
Parameter
Name
Local cell ID CellDlpcPdschPa.LocalCellId Network
plan
(negotiation
not
required)
Set this parameter based on the
network plan. This parameter specifies
the local identity of a cell. Ensure that
this parameter has been set in the
related Cell MO.
PA for even
power
distribution
PaPcOff Network
plan
(negotiation
not
required)
This parameter specifies the Pa value
used when PDSCH power control is
disabled, downlink ICIC is disabled,
and power is evenly distributed for the
PDSCH.
The value DB_3_P_A(-3 dB) is
recommended for multi-antenna
configurations. The value DB0_P_A(0
dB) is recommended for
single-antenna configurations.
Scenario 2: Downlink ICIC Enabled
The following table describes the parameters that must be set in the CellDlpcPdsch MO to configure
PDSCH power control settings.
Parameter
Name
Local cell ID CellDlpcPdsch.LocalCellId Network
plan
(negotiation
not
required)
Cell MO.
Center UE
PA
CcuPa Network
plan
(negotiation
not
required)
This parameter specifies the Pa value for
CCUs when downlink ICIC is enabled.
The value PA_NEG6(-6) (corresponding
to -6 dB) is recommended.
Edge UE PA CeuPa Network
plan
(negotiation
not
required)
This parameter specifies the Pa value for
CEUs when downlink ICIC is enabled.
The value PA_NEG1DOT77(-1.77)
(corresponding to -1.77 dB) is
recommended.

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7.4.3 Initial Configuration
Configuring a Single eNodeB Using the GUI
Configure a single eNodeB using the Configuration Management Express (CME) graphical user
interface (GUI) based on the collected data described in section 7.4.2 "Data Preparation." For details,
see the procedure for configuring a single eNodeB on the CME GUI described in eNodeB Initial
Configuration Guide.
Configuring eNodeBs in Batches
To configure eNodeBs in batches, perform the following steps:
Step 1 On the GUI, set the parameters listed in the table for a specific scenario in this section, and save
the parameter settings as a user-defined template.
The parameters are the same as those described in section 7.4.2 "Data Preparation."
Step 2 Fill in the summary data file with the name of the user-defined template.
The parameter settings in the user-defined template will be applied to the eNodeBs after you import
the summary data file into the CME.
----End
For descriptions of the user-defined template and summary data file and also the detailed procedure for
configuring eNodeBs in batches, see eNodeB Initial Configuration Guide.
Switch Setting for PDCCH Power Control, PHICH Power Control, and PDSCH Power Control in
Semi-Persistent Scheduling Mode
The following table lists the parameter that includes the switches for PDCCH power control, PHICH
power control, and power control for the PDSCH in semi-persistent scheduling mode.
MO Parameter Group Name Parameter
CELLALGOSWITCH CellAlgoSwitch LocalCellId, Downlink power control algorithm
switch
PDSCH Power Settings
 Scenario 1: downlink ICIC disabled
CELLDLPCPDSCHPA CellDlpcPdschPa LocalCellId, PA adjusting switch, PA for even
power distribution(dB)
 Scenario 2: downlink ICIC enabled
CELLDLPCPDSCH CellDlpcPdsch LocalCellId, Center UE Pa, Edge UE Pa

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Configuring a Single eNodeB Using MML Commands
Run the MOD CELLALGOSWITCH command to enable the downlink power control algorithm.
7.4.4 Activation Observation
Power Allocation for Cell-specific Reference Signals
Enable a UE to access a cell. On the operation and maintenance terminal (OMT) for the UE, check the
message tracing results for the RRC_SYS_INFO message.
Figure 7-1 shows an example of the message tracing result. In the highlighted area, the cell-specific
reference signal power is 15.2 dBm and, due to the display precision, displayed as 15 dBm.
Figure 7-1 Example of the cell-specific reference signal power
Power Allocation for Synchronization Signals
On the M2000 client, check the setting of the cell-specific reference signal power. Then, run the LST
CELLCHPWRCFG command to check the synchronization signal power setting in each cell.
Figure 7-2 shows an example of the result.

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7-12
Figure 7-2 Example of the synchronization signal power
Power Allocation for the PBCH
CELLCHPWRCFG command to check the PBCH power setting in each cell.
Figure 7-3 Example of the PBCH power
Power Allocation for the PCFICH
CELLCHPWRCFG command to check the PCFICH power setting in each cell.

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7-13
Figure 7-4 Example of the PCFICH power
Power Allocation for the PDSCH Carrying RACH Response, Paging Messages,
and SIBs
CELLCHPWRCFG command to check the power setting for the PDSCH that carries the RACH
response, paging messages, and SIBs in each cell.
Figure 7-5 Example of the power for the PDSCH carrying RACH response, paging messages, and SIBs
Power Control for the PHICH
To verify whether inner-loop power control for the PHICH takes effect, perform the following steps:
Step 1 On the M2000 client, create a DL power control monitoring task as follows:
1. Choose Monitoring > Signaling Trace > Signaling Trace Management.
2. In the navigation tree on the left of the Signaling Trace Management window, choose User
Performance Monitoring > DL Power Control Monitoring and click New.
Step 2 Enable a UE to access the network.
Step 3 On the M2000 client, check the values of Power Offset of PHICH(0.01dB) in the monitoring
results.

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7-14
If the values of Power Offset of PHICH(0.01dB) are not 0, inner-loop power control for the PHICH is
activated, as shown in Figure 7-6.
Figure 7-6 PHICH power offset values other than 0
Figure 7-7 shows the result that inner-loop power control for the PHICH is deactivated.
Figure 7-7 PHICH power offset values being 0
---End

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7-15
To verify whether PDCCH power control takes effect, perform the following steps:
Step 2 Enable a UE to access a cell at a place where the RSRP is -110 dB, and ensure that a
neighboring cell is loaded.
Step 3 Inject downlink packets to the UE to ensure that the downlink cell throughput reaches its
maximum. Adjust the path loss from the UE to the serving and neighboring cells to make the
uplink channel quality deteriorate while ensuring that no handover is triggered. On the M2000
client, observe the PDCCH power offset.
When the downlink reference-signal SINR falls as low as -7 dBm and the PDCCH power offset
changes (increases in most cases), PDCCH power control is activated. Figure 7-8 shows an
example of the initial power offset for the PDCCH.
Figure 7-8 Initial power offset values for the PDCCH
---End
Power Settings for the PDSCH Carrying Channels Other Than RACH
Response, Paging Messages, and SIBs
Scenario 1: Downlink ICIC Disabled

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7-16
To verify whether PDSCH power control takes effect in this scenario, perform the following steps:
Step 1 Enable a UE to access the network, and start a downlink service on the UE.
Step 3 Move the UE between the cell center and the cell edge, and monitor the PDSCH Pa.
The expected result is that during the UE movement, Pa maintains the default value (-3 dB) used in
even power distribution scenarios, as shown in Figure 7-9.
Figure 7-9 PDSCH Pa (ICIC disabled)
---End
Scenario 2: Downlink ICIC Enabled
To verify whether PDSCH power control takes effect in this scenario, perform the following steps:
Step 1 Enable UE 1 to access the network, and start a downlink service on UE 1. Then, enable other
UEs to access the same network, and simulate ICIC activation conditions to trigger ICIC.
Step 3 Move UE 1 between the cell center and the cell edge, and monitor the PDSCH Pa.
The expected result is that Pa is the value for CEUs (-1.77 dB by default, as shown in Figure 7-10)
when UE 1 moves to the cell edge (as indicated by event A3) and is the value for CCUs (-6 dB by
default, as shown in Figure 7-11) when UE 1 moves to the cell center.

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Figure 7-10 PDSCH Pa for CEUs (ICIC enabled)
Figure 7-11 PDSCH Pa for CCUs (ICIC enabled)
---End
7.4.5 Deactivation
Dynamic Power Adjustment for the PHICH
Run the MOD CELLALGOSWITCH command with the PhichInnerLoopPcSwitch check box cleared
under the DlPcAlgoSwitch parameter.
Run the MOD CELLALGOSWITCH command with the PdcchPcSwitch check box cleared under the
DlPcAlgoSwitch parameter.

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7-18
Pa Adjustment for the PDSCH in Dynamic Scheduling Mode
Run the MOD CELLDLPCPDSCHPA command with the PdschPaAdjSwitch parameter set to
OFF(Off).
Run the MOD CELLALGOSWITCH command with the PdschSpsPcSwitch check box cleared under
the DlPcAlgoSwitch parameter.
7.5 Deploying Uplink Power Control
7.5.1 Deployment Requirements
Uplink power control has no requirement for the operating environment, transmission networking, and
licenses.
7.5.2 Data Preparation
Generic Data
PRACH Power Settings
The following table describes the parameters that must be set in the RACHCfg MO to configure the
PRACH power control settings.
Parameter
Name
Local cell ID RACHCfg.Loc
alCellId
Network plan
(negotiation
not required)
Power ramping
step
PwrRampingS
tep
Network plan
(negotiation
not required)
This parameter specifies the preamble power
ramping step. If multiple attempts to access
the PRACH fail, the UE increases the transmit
power for random access preambles by a
step specified by this parameter to ensure
successful access.
The value
DB2_PWR_RAMPING_STEP(2dB) is
recommended.
Preamble initial
received target
power
PreambInitRcv
TargetPwr
Network plan
(negotiation
not required)
This parameter specifies the target UE
transmit power for the PRACH expected by
the eNodeB for preamble detection when
PRACH preamble format 0 is used.
The value DBM_104(-104dBm) is
recommended.
PUSCH Power Settings
The following table describes the parameters that must be set in the CellUlpcComm MO to configure
PUSCH power control settings.

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7-19
Parameter
Name
Local cell ID CellUlpcCom
m.LocalCellId
Network plan
(negotiation
not required)
Path loss
coefficient
PassLossCoef
f
Network plan
(negotiation
not required)
This parameter specifies the compensation
factor for path loss. It is used in uplink power
control. For details, see 3GPP TS 36.213.
The value AL07(0.7) is recommended.
P0 nominal
PUSCH
P0NominalPU
SCH
Network plan
(negotiation
not required)
transmit power for the PUSCH expected by
the eNodeB for normal demodulation of the
PUSCH. For details, see 3GPP TS 36.213.
The value -67 (corresponding to -67 dBm) is
recommended.
The following table describes the parameters that must be set in the CellUlpcDedic MO to configure the
dedicated RRC parameters for PUSCH power control.
Parameter
Name
Local cell ID CellUlpcDedic.
LocalCellId
Network plan
(negotiation
not required)
Delta-MCS
enable or disable
indication
DeltaMcsEnabl
ed
Network plan
(negotiation
not required)
This parameter specifies whether to use delta
MCS (the difference between MCSs) during
adjustments on the UE transmit power.
The value UU_DISABLE(Disable) is
recommended.
RSRP filtering
coefficient
FilterRsrp Network plan
(negotiation
not required)
This parameter specifies the Alpha filtering
coefficient used by the UE to filter RSRP
measurement values during path loss
estimation.
The value
UU_FC6_FILTER_COEFF(UU_FC6_FILTER
_COEFF) is recommended.
the closed-loop power control switch for the PUSCH in semi-persistent scheduling mode and the
inner-loop power control switch for the PUSCH in dynamic scheduling mode.

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Parameter
Name
Local cell ID CellAlgoSwitch.LocalCellId Network
plan
(negotiation
not
required)
Cell MO.
Uplink
power
control
algorithm
switch
UlPcAlgoSwitch Network
plan
(negotiation
not
required)
CloseLoopSpsSwitch under this
parameter specifies the closed-loop
power control switch for the PUSCH in
semi-persistent scheduling mode. If this
switch is turned off, closed-loop power
control is not performed on the PUSCH
in semi-persistent scheduling mode. If
this switch is turned on, the eNodeB
adjusts TPC commands based on
whether the received initial-transmission
packets are correct in order to decrease
the IBLER. It is recommended that this
switch be set to the same state as the
semi-persistent scheduling switch.
InnerLoopPuschSwitch under this
parameter specifies the inner-loop
power control switch for the PUSCH in
dynamic scheduling mode. If this switch
is turned on, inner-loop power control is
performed for the PUSCH in dynamic
scheduling mode. It is recommended
that this switch be turned on.
PUCCH Power Settings
The following table describes the parameters that must be set in the CellUlpcComm MO to configure
PUCCH power control parameters.
Parameter
Name
Local cell ID CellUlpcCom
m.LocalCellId
Network plan
(negotiation
not required)
P0 nominal
PUCCH
P0NominalPU
CCH
Network plan
(negotiation
not required)
transmit power for the PUCCH expected by
the eNodeB for normal demodulation of the
PUCCH. For details, see 3GPP TS 36.213.
The value -105 (corresponding to -105 dBm) is
recommended.

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Parameter
Name
DeltaF for
PUCCH format 1
DeltaFPUCCH
Format1
Network plan
(negotiation
not required)
This parameter specifies the Delta value
corresponding to PUCCH format 1. The value
DELTAF0(0dB) is recommended.
DeltaF for
PUCCH format
1b
DeltaFPUCCH
Format1b
Network plan
(negotiation
not required)
corresponding to PUCCH format 1b. The value
DeltaF for
PUCCH format 2
DeltaFPUCCH
Format2
Network plan
(negotiation
not required)
corresponding to PUCCH format 2. The value
DeltaF for
PUCCH format
2a
DeltaFPUCCH
Format2a
Network plan
(negotiation
not required)
corresponding to PUCCH format 2a. The value
DeltaF for
PUCCH format
2b
DeltaFPUCCH
Format2b
Network plan
(negotiation
not required)
corresponding to PUCCH format 2b. The value
the PUCCH inner-loop power control switch.
Parameter
Name
Local cell ID CellAlgoSwitch
.LocalCellId
Network plan
(negotiation
not required)
Uplink power
control algorithm
switch
UlPcAlgoSwitc
h
Network plan
(negotiation
not required)
InnerLoopPucchSwitch under this parameter
specifies the PUCCH inner-loop power control
switch. If this switch is turned on, inner-loop
power control is performed for the PUCCH.
It is recommended that this switch be turned
on.
Sounding Reference Signal Power Settings
The following table describes the parameters that must be set in the CellUlpcDedic MO to configure the
offset of the sounding reference signal power relative to the PUSCH power.
Parameter Name Parameter ID Source Setting Description
Local cell ID CellUlpcDedi
c.LocalCellId
Network plan
(negotiation
not required)

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7-22
Parameter Name Parameter ID Source Setting Description
Power Offset of
SRS to PUSCH
with
DeltaMcsEnabled
Off
PSrsOffsetD
eltaMcsDisab
le
Network plan
(negotiation
not required)
sounding reference signal power relative to the
PUSCH power when DeltaMcsEnabled is set
to UU_DISABLE(Disable).
recommended.
Power Offset of
SRS to PUSCH
with
DeltaMcsEnabled
On
PSrsOffsetD
eltaMcsEnabl
e
Network plan
(negotiation
not required)
sounding reference signal power relative to the
PUSCH power when DeltaMcsEnabled is set
to UU_ENABLE(Enable).
recommended.
Scenario-specific Data
None
7.5.3 Initial Configuration
Configuring a Single eNodeB Using the GUI
Configure a single eNodeB using the CME GUI based on the collected data described in section 7.5.2
"Data Preparation." For details, see the procedure for configuring a single eNodeB on the CME GUI
described in eNodeB Initial Configuration Guide.
Configuring eNodeBs in Batches
To configure eNodeBs in batches, perform the following steps:
Step 1 On the GUI, set the parameters listed in the table provided in this section, and save the
parameter settings as a user-defined template.
The parameters are the same as those described in section 7.5.2 "Data Preparation."
Step 2 Fill in the summary data file with the name of the user-defined template.
The parameter settings in the user-defined template will be applied to the eNodeBs after you import
the summary data file into the CME.
----End
For descriptions of the user-defined template and summary data file and also the detailed procedure for
configuring eNodeBs in batches, see eNodeB Initial Configuration Guide.
This following table lists the parameter that includes the switches for inner-loop power control for the
PUSCH in dynamic scheduling mode, closed-loop power control for the PUSCH in semi-persistent
scheduling mode, and PUCCH power control.

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MO Parameter Group Name Parameter Remarks
CELLAL
GOSWIT
CH
CellAlgoSwitch LocalCellId, Uplink power
control algorithm switch
Closed-loop power control for
the PUSCH in semi-persistent
scheduling mode takes effect
only when uplink
semi-persistent scheduling is
activated.
Configuring a Single eNodeB Using MML Commands
Run the MOD CELLALGOSWITCH command to enable the uplink power control algorithm.
7.5.4 Activation Observation
To verify whether uplink power control takes effect, perform the operations in this section.
PRACH Power Settings
Enable a UE to access a cell. On the OMT for the UE, check the message tracing results for the
RRC_SYS_INFO message.
Figure 7-12 shows an example of the message tracing result. In the highlighted area, the target power
for the initially received preamble is -104 dBm, and the power ramping step is 2 dB.
Figure 7-12 Example of the PRACH power

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PUSCH Power Settings
To observe static parameter settings for PUSCH power control, perform the following steps:
Step 1 On the M2000 client, create a Uu interface tracing task as follows:
2. In the navigation tree on the left of the Signaling Trace Management window, choose
Application Layer > Uu Interface Trace and click New.
Step 2 Enable a UE to access a cell.
Step 3 On the OMT for the UE, check the message tracing results for the RRC_SYS_INFO message,
and observe the values of the information element (IE) p0-NominalPUSCH (nominal PUSCH
power) and the IE alpha (path loss compensation factor).
Figure 7-13 shows an example of the message tracing result. In the highlighted area, alpha is 0.7
and p0-NominalPUSCH is -67 dBm.
Figure 7-13 Example of the RRC_SYS_INFO message
Step 4 On the M2000 client, check the Uu interface tracing results for the RRC_CONN_SETUP
message.
Figure 7-14 shows an example of the message tracing result. In the highlighted area, the delta-MCS
switch is turned off and the RSRP filtering coefficient is 6.

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Figure 7-14 Example of the RRC_CONN_SETUP message
---End
To verify whether inner-loop power control for the PUSCH in dynamic scheduling mode takes effect,
perform the following steps:
Step 1 On the M2000 client, create an RB usage monitoring task as follows:
2. In the navigation tree on the left of the Signaling Trace Management window, choose Cell
Performance Monitoring > Usage of RB Monitoring and click New.
Step 2 Enable a UE to access a cell. Perform uplink packet injection for the UE at a place where the
RSRP is about -100 dB to ensure that uplink cell throughput reaches its maximum.
Step 3 On the M2000 client, check the monitoring results for the number of RBs used by the UE.
The power control is activated if the cell bandwidth is 20 MHz and about 90 RBs are used per
millisecond as shown in Figure 7-15, or if the cell bandwidth is 10 MHz and about 40 RBs are used
per millisecond. The power control is deactivated if only about 10 RBs are used per millisecond, as
shown in Figure 7-16.
Figure 7-15 and Figure 7-16 show the numbers of RBs used per second.

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