ZTE LTE FDD Power Control
Feature Guide
LR14
ZTE LTE FDD Power Control Feature Guide
Version
V 1.0
V 2.0
V3.0
Date
2013-7-14
2014-05-15
2014-12-23
Author
Reviewer
Wang Fei
Wang Fei
Hou
Mengjie
Yao Xin
Wang Fei
Chen
Huijuan
Notes
Zhang Qian
Wu Jiwen
Not open to the third party
Li Nana
Add the chapter 5.
Li Nana
Add Chapter 7: Impact on Network
Add full names for some abbreviations
Modify some wrong spellings
Modify chapter 4 according to ZXSDR
UniRAN FDD-LTE Base Station
(V3.20.50) Radio Parameter Reference
Change the word template
© 2015 ZTE Corporation. All rights reserved.
ZTE CONFIDENTIAL: This document contains proprietary information of ZTE and is not to be disclosed or used
without the prior written permission of ZTE.
Due to update and improvement of ZTE products and technologies, information in this document is subjected to
change without notice.
ZTE Confidential Proprietary
© 2015 ZTE CORPORATION. All rights reserved.
I
TABLE OF CONTENTS
1
1.1
1.2
1.3
1.4
Introduction........................................................................................................ 1
Scope ................................................................................................................... 1
Target Group ........................................................................................................ 1
Feature Attributes................................................................................................. 1
Correlation with Other Features ........................................................................... 2
2
Definition ............................................................................................................ 2
3
3.1
3.1.1
3.1.2
3.1.3
3.1.4
3.1.5
3.2.8
3.2.9
Technical Description ....................................................................................... 3
Feature Description .............................................................................................. 3
PUSCH Power Control ......................................................................................... 4
PUCCH Power Control ......................................................................................... 4
SRS Power Control .............................................................................................. 5
PRACH Power Control ......................................................................................... 5
Downlink Physical Channels or Signal Power Offsets Related to Cell Reference
Signals ................................................................................................................. 5
Logical Downlink Channel Power Offsets Related to Cell Reference Signals ....... 6
Technical Description ........................................................................................... 6
PUSCH Open-Loop Power Control ...................................................................... 6
PUSCH Closed-Loop Power Control .................................................................... 8
PUCCH Open-Loop Power Control .................................................................... 13
PUCCH Closed-Loop Power Control .................................................................. 14
SRS Power Control ............................................................................................ 16
PRACH Open-Loop Power Control .................................................................... 17
Configuring the Transmit Power of a Downlink Physical Channel, Signal, or
Logical Channel ................................................................................................. 18
Downlink Physical Channel, Signal, or Power Offset .......................................... 19
Power Offset of a Downlink Logical Channel ...................................................... 19
4
4.1
4.1.1
4.1.2
4.1.3
4.2
4.2.1
4.2.2
4.2.3
4.3
4.3.1
4.3.2
4.3.3
4.4
4.4.1
4.4.2
4.4.3
4.5
Key Parameters and Configuration ................................................................ 19
PUSCH Open-Loop Power Control .................................................................... 19
Parameters List .................................................................................................. 19
Parameter Configuration Rule ............................................................................ 20
Configuration Description ................................................................................... 22
PUSCH Closed-Loop Power Control .................................................................. 26
Parameters List .................................................................................................. 26
Parameter Configuration Rule ............................................................................ 26
Configuration Description ................................................................................... 30
PUCCH Open-Loop Power Control .................................................................... 36
Parameters List .................................................................................................. 36
Parameter Configuration Rule ............................................................................ 37
Configuration Description ................................................................................... 39
PUCCH Close-Loop Power Control .................................................................... 42
Parameters List .................................................................................................. 42
Parameter Configuration Rule ............................................................................ 43
Configuration Description ................................................................................... 46
SRS Power Control ............................................................................................ 49
3.1.6
3.2
3.2.1
3.2.2
3.2.3
3.2.4
3.2.5
3.2.6
3.2.7
4.5.1
4.5.2
4.5.3
4.6
4.6.1
4.6.2
4.6.3
4.7
4.7.1
4.7.2
4.7.3
Parameters List .................................................................................................. 49
Parameter Configuration Rule ............................................................................ 50
Configuration Description ................................................................................... 53
PRACH Power Control ....................................................................................... 59
Parameters List .................................................................................................. 59
Parameter Configuration Rule ............................................................................ 59
Configuration Description ................................................................................... 61
Downlink Power Allocation ................................................................................. 63
Parameters List .................................................................................................. 63
Parameter Configuration Rule ............................................................................ 63
Configuration Description ................................................................................... 69
5
5.1
5.1.1
5.1.2
5.1.3
5.2
5.2.1
5.2.2
5.2.3
5.3
5.3.1
5.3.2
5.3.3
5.4
5.4.1
5.4.2
5.4.3
5.5
5.5.1
5.5.2
5.5.3
5.6
5.6.1
5.6.2
5.6.3
5.7
5.7.1
5.7.2
5.7.3
Feature Validation............................................................................................ 72
PUSCH Open-Loop Power Control .................................................................... 72
Topology ............................................................................................................ 72
Test Specification ............................................................................................... 72
Test Result ......................................................................................................... 74
PUSCH Closed-Loop Power Control .................................................................. 76
Topology ............................................................................................................ 76
Test Specification ............................................................................................... 76
Test Result ......................................................................................................... 77
PUCCH Open-Loop Power Control .................................................................... 79
Topology ............................................................................................................ 79
Test Specification ............................................................................................... 79
Test Result ......................................................................................................... 80
PUCCH Closed-Loop Power Control .................................................................. 82
Topology ............................................................................................................ 82
Test Specification ............................................................................................... 82
Test Result ......................................................................................................... 83
SRS Power Control ............................................................................................ 84
Topology ............................................................................................................ 84
Test Specification ............................................................................................... 84
Test Result ......................................................................................................... 85
PRACH Open-Loop Power Control .................................................................... 87
Topology ............................................................................................................ 87
Test Specification ............................................................................................... 87
Test Result ......................................................................................................... 88
Downlink Power Allocation ................................................................................. 90
Topology ............................................................................................................ 90
Test Specification ............................................................................................... 91
Test Result Check .............................................................................................. 91
6
6.1
6.2
6.3
Related Counters, KPI and Alarms ................................................................. 93
Related Counters ............................................................................................... 93
Related KPI ........................................................................................................ 93
Related Alarms................................................................................................... 93
7
Impact on Network........................................................................................... 94
8
Abbreviations................................................................................................... 94
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III
FIGURES
Figure 3-1 Mapping Between Uplink Transport Channels and Uplink Physical Channels ..... 3
Figure 3-2 Mapping Between Downlink Transport Channels and Downlink Physical
Channels ................................................................................................................................ 3
Figure 3-3 UE PRACH power ramp up process ................................................................. 18
Figure 4-1 Configuring to active PUSCH Open-Loop Power Control .................................. 23
Figure 4-2 Configuring the parameters of PUSCH Open-Loop power control ..................... 24
Figure 4-3 Configuring the parameter of PUSCH Power Offset .......................................... 24
Figure 4-4 Configuring to deactivate PUSCH Open-Loop Power Control ........................... 25
Figure 4-5 Configuring to active PUSCH Close-Loop Power Control .................................. 31
Figure 4-6 Configuring PUSCH closed loop power control types ........................................ 32
Figure 4-7 Configuring the parameters of PUSCH Open-Loop power control ..................... 33
Figure 4-8 Configuring the Parameter of PUSCH Power Offset.......................................... 34
Figure 4-9 Configuring DCI3/3A Parameters ...................................................................... 35
Figure 4-10 Configuring to deactivate PUSCH Close-Loop Power Control ......................... 36
Figure 4-11 Configuring to active PUCCH Open-Loop Power Control ................................ 39
Figure 4-12 Configuring the Parameters of PUCCH Open-Loop Power Control ................. 40
Figure 4-13 Configuring the Parameter of PUCCH Power Offset of UE .............................. 41
Figure 4-14 Configuring to deactivate PUCCH Open-Loop Power Control ......................... 42
Figure 4-15 Configuring to active PUCCH Close-Loop Power Control................................ 46
Figure 4-16 Configuring the parameters of PUCCH Close-Loop power control .................. 47
Figure 4-17 Configuring the Parameter of PUCCH Power Offset of UE .............................. 47
Figure 4-18 Configuring DCI3/3A Parameters .................................................................... 48
Figure 4-19 Configuring to deactivate PUCCH Close-Loop Power Control ......................... 49
Figure 4-20 Configuring SRS Power Control type .............................................................. 54
Figure 4-21 Configuring SRS Close Loop Power Control Type .......................................... 55
Figure 4-22 Configuring the parameters of SRS power control........................................... 56
Figure 4-23 Configuring the Parameter of Power Offset of SRS Relative to PUSCH .......... 56
Figure 4-24 Configuring the Parameter of PUSCH Power offset of UE ............................... 57
Figure 4-25 Configuring DCI3/3A Parameters .................................................................... 58
Figure 4-26 Configuring the Power offset based on PRACH message parameter .............. 61
Figure 4-27 Configuring the other parameters of PUCCH Close-Loop power control ......... 62
Figure 4-28 configuring the Referenced signal power of BP resource parameter ............... 70
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V
Figure 4-29 Configuring the Power offset parameters of downlink logical channel ............. 71
Figure 5-1 Topology of PUSCH Open-Loop Power Control Test ........................................ 72
Figure 5-2 p-max ................................................................................................................ 74
Figure 5-3 SIB2 Contains Uplink Power Control Parameters .............................................. 74
Figure 5-4 P0-UE-PUSCH Information ............................................................................... 74
Figure 5-5 Number of RBs in the DCI Information .............................................................. 75
Figure 5-6 PUSCH Transmit Power Observed on the UE Side........................................... 75
Figure 5-7 DCI0 Message Received .................................................................................. 78
Figure 5-8 PUSCH Power .................................................................................................. 78
Figure 5-9 PUCCH Power Parameters in SIB2 .................................................................. 80
Figure 5-10 PUCCH Power Parameters in the RRC Connection Reconfiguration Message
............................................................................................................................................. 81
Figure 5-11 PUCCH Transmit Power Information ............................................................... 81
Figure 5-12 Result of PUCCH Closed-Loop Power Control ................................................ 83
Figure 5-13 SRS Power Parameters in SIB2 ...................................................................... 85
Figure 5-14 Re-configured SRS and PUSCH Parameters .................................................. 86
Figure 5-15 SRS Power Result .......................................................................................... 86
Figure 5-16 PRACH Power Parameters in SIB2 ................................................................. 88
Figure 5-17 Number of MSG1 Transmission Times............................................................ 89
Figure 5-18 Path Loss Shown in the LTE PUSCH Control Log .......................................... 89
Figure 5-19 Preamble Format and PRACH transmit Power Shown in MSG1 ..................... 90
Figure 5-20 P-A Value ........................................................................................................ 92
Figure 5-21 P_B Value Being the Same as RS Value ........................................................ 93
TABLES
Table 3-1 Mapping of TPC Command Field in DCI format 0/3 to absolute and accumulated
 PUSCH values ....................................................................................................................... 12
Table 3-2 Mapping of TPC Command Field in DCI format 1A/1/2A/2/3 to  PUCCH values ... 15
Table 4-1 Parameters List .................................................................................................. 19
Table 4-2 Configuration rule of parameters ........................................................................ 20
Table 4-3 Parameters List .................................................................................................. 26
Table 4-4 Configuration rule of parameters ........................................................................ 26
Table 4-5 Parameters List .................................................................................................. 36
Table 4-6 Configuration rule of parameters ........................................................................ 37
Table 4-7 Parameters List .................................................................................................. 42
Table 4-8 Configuration rule of parameters ........................................................................ 43
Table 4-9 Parameters List .................................................................................................. 49
Table 4-10 Configuration rule of parameters ...................................................................... 50
Table 4-11 Parameters List ................................................................................................ 59
Table 4-12 Configuration rule of parameters ...................................................................... 59
Table 4-13 Parameters List ................................................................................................ 63
Table 4-14 Configuration rule of parameters ...................................................................... 63
Table 5-1 Equipment Requirements of the PUSCH Open-Loop Power Control Test .......... 72
Table 5-2 Test Specifications of PUSCH Open-Loop Power Control .................................. 73
Table 5-3 Test Specifications of PUSCH Closed-Loop Power Control................................ 76
Table 5-4 Test Specifications of PUCCH Open-Loop Power Control .................................. 79
Table 5-5 Test Specifications of PUCCH Closed-Loop Power Control ............................... 82
Table 5-6 Test Specifications of SRS Power Control .......................................................... 84
Table 5-7 Test Specifications of PRACH Power Control .................................................... 87
Table 5-8 Test Specifications of Downlink Power Allocation ............................................... 91
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VII
ZTE LTE FDD Power Control Feature Guide
1
1.1
Introduction
Scope
This document describes the power control technology applied to the eNodeB in an LTE
network, including the basic theory, algorithm flows, performance enhancement, and
application scenarios.
1.2
Target Group
This document is intended for:
1.3

Personnel who need to understand FDD Power Control function

Personnel who work with ZTE products
Feature Attributes

For FDD single-mode eNodeB V3.20.50.20 series:
OMMB version: V12.13.58
EMS version: V12.13.58

For GUL multi-mode eNodeB V4.13.15 series:
OMMB version: V12.13.52
EMS version: V12.13.51
Note:
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1
ZTE LTE FDD Power Control Feature Guide
FDD single-mode V3.20.50.20 corresponds to GUL multi-mode V4.13.15, and LTE
technology description and operation requirements in the corresponding versions are the
same.
Involved NEs:
UE
√
eNodeB
MME
√
-
S-GW
-
BSC/RNC
-
SGSN
-
P-GW
-
HSS
-
Note:
*-: Not involved
*√: involved
1.4
Correlation with Other Features
None.
2
2
Definition
PBCH
Physical Broadcast Channel
PCFICH
Physical control format indicator channel
PDCCH
Physical Downlink Control Channel
PHICH
Physical hybrid-ARQ indicator channel
PRACH
Physical Random Access Channel
PSD
Power Spectral Density, transmitting power on an RB
PUCCH
Physical Uplink Control Channel
PUSCH
Physical Uplink Shared Channel
SINR
Signal to Interference plus Noise Ratio
SRS
Sounding Reference Signal
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ZTE LTE FDD Power Control Feature Guide
TPC
3
3.1
Transmit Power Control
Technical Description
Feature Description
Uplink and downlink channels are described as follows:
The following figures show the mapping relationships between transport channels and
physical channels.
Figure 3-1
Mapping Between Uplink Transport Channels and Uplink Physical Channels
UL-SCH
RACH
PRACH
PUSCH
Figure 3-2
Uplink
Transport channels
Uplink
Physical channels
PUCCH
Mapping Between Downlink Transport Channels and Downlink Physical
Channels
BCH
PBCH
MCH
PMCH
PCH
DL-SCH
PDSCH
Downlink
Transport channels
PDCCH
Downlink
Physical channels
Power control is implemented on the PUSCH, PRACH, PUCCH, and SRS. Both the
PUSCH and PUCCH support open-loop power control and closed-loop power control,
while the PRACH supports only open-loop power control.
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ZTE LTE FDD Power Control Feature Guide
Downlink power control is a process of determining the transmit power of a downlink
physical channel. The downlink physical channel transmit power per user is offset or
adjusted based on the transmit power of the cell reference signal.
3.1.1
PUSCH Power Control
The Physical Uplink Shared Channel (PUSCH) is primarily used to transmit service data.
The purpose of PUSH power control is to determine the PUSCH transmit power.
PUSCH power control includes open-loop power control and closed-loop power control.
Open loop power control is determined by these OMC parameters: p0NominalPUSCH
(UL Power Control), poNominalPUSCH1 (UL Power Control), p0UePusch1Pub (UL
Power Control), alpha (UL Power Control), and downlink path loss of the UE. Where,
p0NominalPUSCH (UL Power Control) and poNominalPUSCH1 (UL Power Control)
represent the nominal power related to the cell, p0UePusch1Pub (UL Power Control)
represents the power offset related to the UE for data transmission, and alpha (UL Power
Control) represents a compensation factor for path loss. The size of PUSCH RBs that is
allocated to a UE, downlink path loss of the UE, alpha, p0UePusch1Pub and
poNominalPUSCH determine the PUSCH transmit power. Closed loop power control is
used to adjust the transmit power at the UE side dynamically based on the open-loop
transmit power through the TPC command.
PUSCH transmit power affects cell-edge throughput and Quality of Service (QoS). When
configuring an initial transmit power for PUSCH, the cell-edge coverage and cell-edge
data rate requirements should be considered.
3.1.2
PUCCH Power Control
The Physical Uplink Control Channel (PUCCH) is primarily used to transmit uplink control
information. Different PUCCH formats require different transmit power. PUCCH power
control includes open-loop power control and closed-loop power control. PUCCH
transmit power is determined by these parameters: poNominalPUCCH (UL Power
Control), p0UePucchPub (UL Power Control), deltaFPucchFormat1 (UL Power Control),
deltaFPucchFormat1b (UL Power Control), deltaFPucchFormat2 (UL Power Control),
deltaFPucchFormat2a (UL Power Control), and deltaFPucchFormat2b (UL Power
Control). Where, poNominalPUCCH (UL Power Control) represents the nominal power
related to the cell, p0UePucchPub (UL Power Control) represents the power offset
4
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ZTE LTE FDD Power Control Feature Guide
related to the UE for data transmission, and deltaFPucchFormat1 (UL Power Control),
deltaFPucchFormat1b (UL Power Control), deltaFPucchFormat2 (UL Power Control),
deltaFPucchFormat2a (UL Power Control), and deltaFPucchFormat2b (UL Power
Control) represent the power offset corresponding to PUCCH format1a in different
formats. Closed loop power control is used to adjust the transmit power at the UE side
dynamically based on the open-loop transmit power through the Transmit Power Control
(TPC) command.
3.1.3
SRS Power Control
Sounding Reference Signal (SRS) power control includes open-loop power control and
closed-loop power control. For SRS power control, some open-loop transmit power
parameters on a single RB are the same as those of PUSCH, for example,
poNominalPUSCH1 (UL Power Control), p0UePusch1Pub (UL Power Control), and
alpha (UL Power Control). Unlike the transmit power of PUSCH, the transmit power of
SRS is related to format offset, namely, powerOffsetOfSRS (UL Power Control). Both the
closed-loop power control of SRS and that of PUSCH use the same closed-loop
compensation value.
3.1.4
PRACH Power Control
The methods such as open-loop power control and gradual power ramp-up are used in
the random access flow. After the preamble signal is transmitted over a selected random
access channel, the UE waits for random access response message. PRACH transmit
power is determined by these OMC parameters: preambleIniReceivedPower (PRACH)
and powerRampingStep (PRACH). Where, preambleIniReceivedPower represents the
initial target received power for random access, and powerRampingStep (PRACH)
represents the power ramp-up step.
3.1.5
Downlink Physical Channels or Signal Power Offsets Related to Cell
Reference Signals
The transmit power of downlink physical channels (such as PBCH, PDCCH, PCFICH,
and PHICH), primary synchronization signal, or secondary synchronization signal) is
determined by the cell reference signal and power compensation.
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ZTE LTE FDD Power Control Feature Guide
3.1.6
Logical Downlink Channel Power Offsets Related to Cell Reference
Signals
The initial transmit power of PDSCH is determined by PA and PB.
3.2
3.2.1
Technical Description
PUSCH Open-Loop Power Control
PUSCH open-loop power control is primarily used to determine the transmit power of a
PUSCH.
According to 3GPP TS36.213, the transmit power of a PUSCH on the UE side is defined
as follows:
PPUSCH (i )  min{PCMAX ,10log10 ( M PUSCH (i ))  PO _ PUSCH ( j )   ( j )  PL  TF (i)  f (i)}[dBm]
Where,
PO _ PUSCH ( j ) and  ( j ) are open-loop power control parameters, while TF (i) and
f (i ) are closed-loop power control parameters.

PCMAX configuration
PCMAX represents the maximum transmit power of the UE, which is related to the
UE capability level and the maximum allowable transmit power provided by
higher layers.

M PUSCH (i)
M PUSCH (i) is the uplink RB number allocated to the UE.

6
PO_PUSCH,c ( j )
configuration
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ZTE LTE FDD Power Control Feature Guide
PO_PUSCH,c ( j ) consists of PO _ NOMINAL _ PUSCH ( j ) and PO_UE_PUSCH,c ( j ) .
The j parameter is provided by higher layers. When the j parameter is set to 0, it
represents semi-static authorized PUSCH transmission or retransmission. When the j
parameter is set to 1, it represents dynamic authorized PUSCH transmission or
retransmission. When the j parameter is set to 2, it represents random-access-response
authorized PUSCH transmission or retransmission.
When the j parameter is set to 0 or 1, PO _ NOMINAL _ PUSCH ( j ) is related to the throughput of
an uplink edge UE.
For a single cell, the greater PO _ NOMINAL _ PUSCH ( j ) , the greater the uplink throughput and
edge coverage are. However, if PO _ NOMINAL _ PUSCH ( j ) is set to a too large value, inter-cell
interference occurs. PO _ NOMINAL _ PUSCH ( j ) corresponds to p0NominalPUSCH (UL Power
Control) and poNominalPUSCH1 (UL Power Control) in the OMC.
When the j parameter is set to 2:
PO_NOMINAL_PUSCH (2)  PO_PRE   PREAMBLE _ Msg 3
Where, P0 _ PRE
represents the initial target received power for random access and
 PREAMBLE _ Msg 3 represents the power offset of Msg3 based on the PRACH message.
They are signalled from higher layers and correspond to preambleIniReceivedPower
(PrachFDD) and deltaPreambleMsg3 (UL Power Control) respectively in the OMC. It is
recommended that P0 _ PRE
is set to -110 dBm and
 PREAMBLE _ Msg 3 is set to 0 dB.
PO_UE_PUSCH,c ( j ) represents the power offset related to the UE for data transmission
through the PUSCH, which corresponds to p0UePusch1Pub (UL Power Control) in the
OMC.

 ( j ) configuration
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ZTE LTE FDD Power Control Feature Guide
 ( j ) is a compensation factor for path loss.
When the j parameter is set to 0 or 1,
  0, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1 .
 ( j)  0.8 is recommended.
When the j parameter is set to 2,  ( j )  1 .
 ( j ) affects the throughputs of cell-center and cell-edge UEs.  ( j ) corresponds
to alpha (UL Power Control) in the OMC.

When  ( j )  1 , the transmit power of the UE is calculated as full path loss
compensation.

When  ( j )  1 , the transmit power of the UE is calculated as partial path loss
compensation.
Path loss is calculated by the UE according to the transmit power of the reference signal
and the received RSRP as below:
PL = referenceSignalPower – higher layer filtered RSRP
Where, referenceSignalPower is provided by higher layers. This path loss means the
downlink path loss.
3.2.2
PUSCH Closed-Loop Power Control
According to 3GPP TS36.213, the transmit power of a PUSCH on the UE side is defined
as follows:
PPUSCH (i )  min{PCMAX ,10log10 ( M PUSCH (i ))  PO _ PUSCH ( j )   ( j )  PL  TF (i)  f (i)}[dBm]
Where, PO _ PUSCH ( j ) and  ( j ) are open-loop power control parameters while TF (i)
and f (i ) are closed-loop power control parameters.
Closed-loop power control parameters are explained as follows:
8
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ZTE LTE FDD Power Control Feature Guide
1.
TF (i) is used to alleviate the effect of the modulation and code rate on the
uplink
physical
channel
power
offset.
When
Ks=1.25,
PUSCH
 TF (i )  10 log10 ((2 MPR  K S  1)  offset
) . For details about how to calculate these
parameters, refer to 3GPP TS36.213. When Ks=0,  TF (i)  0 . Where, Ks is given
by the parameter deltaMCS-Enable, which is used to make up the uplink physical
channel power offset for adjusting the code rate. It is recommended that Ks is set to
0.
2.
The current sub-frame PUSCH power adjustment value is equal to
f (i) , which is
updated according to the TPC command. The Accumulation-enabled parameter
(accumulation or absolute type) indicates the adjustment type of closed-loop power
control
f (i) . It is provided by the RRM layer and corresponds to puschPCAdjType
(UL Power Control) in the OMC. It is recommended that the Accumulation-enabled
parameter is set to Disabled.
When Accumulation-enabled is set to Enabled, the corresponding closed-loop power
adjustment mode is accumulation, which means that the base station uses a relative
value to instruct the UE to make further adjustment on the basis of the previous transmit
power.
f (i) is updated in the following way according to the TPC command: tt
f (i)  f (i  1)   PUSCH (i  K PUSCH )

 PUSCH (i  K PUSCH ) is a UE-level parameter, which corresponds to PDCCH
TPC in DCI0 and DCI3/3A. The corresponding PDCCH sub-frame is
i  K PUSCH . f (0) is the initial accumulated value. For FDD, K PUSCH  4 .

 PUSCH (dB) corresponds to TPC in DCI0 and DCI3/3A. Refer to The principle of
absolute power control is to reduce redundant PUSCH transmit power. When some
redundant power is left after the channel quality of the UE is mapped to the
highest-order MCS, reducing the transmit power of the UE should be considered.
To reduce the transmit power of the UE, a TPC command is generated based on
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ZTE LTE FDD Power Control Feature Guide
the difference between the target SINR of the UE and the measured SINR of the UE.
In principle, the SINR of the UE should be approximated to the target SINR.


If the UE reaches the maximum transmit power, the positive value of TPC becomes
ineffective.

If the UE reaches the minimum transmit power, the negative value of TPC becomes
ineffective.

The UE should reset the accumulation value in the following scenarios:

The TPC command of absolute power modification value is received.

The

The random access response is received by the UE.
PO_UE_PUSCH
signaling is received.
The principle for accumulation closed-loop power control is as follows:
For closed-loop power control, the base station adjusts the closed-loop power
adjustment value (
f (i) ) by sending the TPC command to the UE. The current Power
Spectrum Density (PSD) of the UE is adjusted dynamically based on
f (i) for the
purpose of approximating the current PSD of the UE to the target PSD.
The adjustment principles for accumulation closed-loop power control are described as
follows:
1.
When the difference between the target PSD and the current PSD of the UE is
greater than 0, the base station sends a positive TPC command to the UE.
2.
When the difference between the target PSD and the current PSD of the UE is
smaller than 0, the base station sends a negative TPC command to the UE.
The principle for setting a target PSD is as follows:
The objective of configuring a target PSD is to maintain an optimal uplink system
performance level. The target PSD is calculated based on the target SINR, NI, and uplink
path loss of the UE.
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ZTE LTE FDD Power Control Feature Guide
PSDTarget  SINRTarget  NI  PL
The actual PSD of the UE can be calculated as follows:
PSDTX  min{PCMAX , PO_PUSCH ( j )   ( j )  PL  TF (i)  f (i)}
A target SINR is configured based on the average uplink bit rate, UE power efficiency,
inter-cell interference cancellation, and other factors. A too high target SINR increases
the average UE bit rate but causes unnecessary power waste and interference to
adjacent cells. A too low target SINR decreases the average UE bit rate. The objective of
closed-loop power control is to ensure a high SINR and meanwhile reduce interference
to adjacent cells. The initial value of a target SINR is configured based on the downlink
path loss of the UE. The base station can obtain the location information of the UE
through the Reference Signal Received Power (RSRP) and the PHR. In addition, the
base station can adjust the target SINR dynamically according to the interference to
adjacent cells.
When Accumulation-enabled is set to Disabled (indicating absolute closed-loop power
control), the base station controls the UE transmit power through the absolute value
instruction. f (i) is updated in the following way according to the TPC command:
f (i)   PUSCH (i  K PUSCH )

 PUSCH (i  K PUSCH )
is determined by the TPC sent from DCI0 based on the
i  K PUSCH .

For FDD, K PUSCH =4 .

 PUSCH (dB) corresponds to TPC in DCI0.,Refer to The principle of absolute power
control is to reduce redundant PUSCH transmit power. When some redundant
power is left after the channel quality of the UE is mapped to the highest-order MCS,
reducing the transmit power of the UE should be considered. To reduce the transmit
power of the UE, a TPC command is generated based on the difference between
ZTE Confidential & Proprietary
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ZTE LTE FDD Power Control Feature Guide
the target SINR of the UE and the measured SINR of the UE. In principle, the SINR
of the UE should be approximated to the target SINR.

.

When the DCI0 of the sub-frame is not detected and runs in DRX mode, and no
uplink sub-frame is available for TDD:
f (i )  f (i  1)
The principle of absolute power control is to reduce redundant PUSCH transmit power.
When some redundant power is left after the channel quality of the UE is mapped to the
highest-order MCS, reducing the transmit power of the UE should be considered. To
reduce the transmit power of the UE, a TPC command is generated based on the
difference between the target SINR of the UE and the measured SINR of the UE. In
principle, the SINR of the UE should be approximated to the target SINR.
Table 3-1 Mapping of TPC Command Field in DCI format 0/3 to absolute and
accumulated  PUSCH values
TPC Command Field in
Accumulated
 PUSCH [dB]
DCI format 0/3
Absolute  PUSCH [dB] only DCI
format 0
0
-1
-4
1
0
-1
2
1
1
3
3
4
Closed-loop power control supports adaptive switching between the accumulative mode
and absolute mode. The adaptive scheme determines the TPC mode of a terminal based
on the terminal location, power adjustment value, and measurement precision.
The adjustment principle for closed-loop power control in adaptive mode is: The
corresponding TPC command is generated based on the difference between the actual
PSD and the PSD of the target SINR. The principle for setting a target SINR is to ensure
that the UE uses a low transmit power to reach the target MCS, on the basis of
suppressing interference to adjacent cells caused by unnecessary power waste and
preventing a decrease in the average UE bit rate caused by a too low SINR.
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In closed-loop power control based on the OI, cell 1 sends the overload indicator to its
adjacent cell (cell 2) through the X2 interface when some frequency bands are interfered
with severely. Cell 2 receives the OI and adjusts the UE transmit power in cell 2 in
accordance with the OI level. In this way, the interference of these frequency bands in
cell 1 is reduced.
After closed-loop power control is enabled, the adjustment value of the UE-level OI is
generated. The TPC command is then generated based on the OI adjustment value. The
OI adjustment value of the UE is calculated based on the probability of high interference
of in the adjacent cell, the interference level of the adjacent cell received by the local cell,
and the GBR satisfaction of the UE.
3.2.3
PUCCH Open-Loop Power Control
On the UE side, the PUCCH transmit power is calculated as follows:


PPUCCH  i   min PCMAX , P0_PUCCH  PL  h  nCQI , nHARQ   F_PUCCH  F   g i  [dBm]


Where, PO _ PUCCH , h nCQI , nHARQ , and F_PUCCH ( F ) are open-loop power control
parameters and g  i  is a closed-loop power control parameter.
These parameters are described as follows:

PCMAX represents the maximum transmit power of the UE, which is related to the
UE capability level and the maximum allowable transmit power configured by higher
layers.

PO_PUCCH consists of PO_NOMINAL_ PUCCH and PO_UE_PUCCH , which are configured by
the RRM layer and correspond to poNominalPUCCH (UL Power Control) and
p0UePucchPub (UL Power Control) in the OMC. It is recommended that
PO_NOMINAL_ PUCCH is set to -105 dBm and PO_UE_PUCCH is set to 1 Db.
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ZTE LTE FDD Power Control Feature Guide

F_PUCCH ( F )
is
configured
by
higher
layers.
Each
F_PUCCH ( F )
value
corresponding to a PUCCH format is a power offset relative to PUCCH format 1a.
The following power offsets need to be configured in the OMC:


deltaFPucchFormat1 (UL Power Control)

deltaFPucchFormat1b (UL Power Control)

deltaFPucchFormat2 (UL Power Control)

deltaFPucchFormat2a (UL Power Control)

deltaFPucchFormat2b (UL Power Control)
h(nCQI , nHARQ ) is a PUCCH format dependent value. nCQI corresponds to the
number of information bits for the channel quality information.
nHARQ is the number
of HARQ-ACK bits .
3.2.4
PUCCH Closed-Loop Power Control
On the UE side, the PUCCH power control equation is defined as below:


PPUCCH  i   min PCMAX , P0_PUCCH  PL  h  nCQI , nHARQ   F_PUCCH  F   g i  [dBm]


Where, PO _ PUCCH , h nCQI , nHARQ , and F_PUCCH ( F ) are open-loop power control
parameters and g  i  is a closed-loop power control parameters.
These parameters are described as below:

 PUCCH
is a UE-level power correction parameter, which corresponds to a TPC
command contained in DCI1A/1B/1D/1/2A/2/3. CRC corresponds to C-RNTI or
TPC-PUCCH-RNTI.
For
the
mapping
relationship
between
 PUCCH
and
DCI1A/1B/1D/1/2A/2/3, refer to It should be noted that a target Ps is not a value but
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a scale, in order to avoid fluctuation in the transmit power of the PUCCH. To
determine the scale of a target Ps, the inter-symbol interference of the PRB and the
interference of adjacent cells should be considered. It is inappropriate to blindly
increase the transmit power to reduce the DTX of the PUCCH. The DTX of the
PUCCH is not only related to the power control of the PUCCH, but also related to
downlink performance. Blindly increasing the transmit power will increase the power
between UEs. Therefore, the configuration principle is to set a target Ps to a tradeoff
value on the premise of ensuring demodulation performance.

.
Table 3-2
Mapping of TPC Command Field in DCI format 1A/1/2A/2/3 to
 PUCCH
values
 PUCCH [dB]
TPC Command Field in DCI format 1A/1/2A/2/3
0
-1
1
2
3
0
1
3

When the TPC command is successfully transmitted, g(i) is updated based on the
TPC command.
M 1
g (i )  g (i  1)    PUCCH (i  km )
m0
Where,
g (i) is the transmit power adjustment value of the current frame on the
PUCCH.

For FDD, M  1 and k0  4 .

If the UE reaches the maximum transmit power, the positive TPC becomes
ineffective.

If the UE reaches the minimum transmit power, the negative TPC becomes
ineffective.
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ZTE LTE FDD Power Control Feature Guide
g(i) is a UE-level power correction parameter for closed-loop power control. The code
division technology is used for data transmission on the PUCCH. Multiple UEs use the
same RB for data transmission on the PUCCH. For format1 series, the number of UEs
that are multiplexed on the same RB is variable, and therefore the interference received
by the PRB and the PUCCH quality will change considerably. The PUCCH uses the
received power (Ps) for the purposes of power control and cell-edge coverage.
The idea behind the closed-loop power control of the PUCCH is as below: The base
station maintains the target Ps and measures the current Ps. Depending on the
difference between the measured Ps and the target Ps, the base station generates a
TPC command, which is sent in DCI 1A/1/2A/2/3. The UE adjusts the transmit power of
the PUCCH according to the TPC command to ensure that the Ps of the UE can quickly
approximate to the target Ps. The adjustment principles are described as follows:

When the difference between the target Ps and the measured Ps is greater than 0,
the base station sends a positive TPC command to the UE.

When the difference between the target Ps and the measured Ps is smaller than 0,
the base station sends a negative TPC command to the UE.
It should be noted that a target Ps is not a value but a scale, in order to avoid fluctuation in
the transmit power of the PUCCH. To determine the scale of a target Ps, the inter-symbol
interference of the PRB and the interference of adjacent cells should be considered. It is
inappropriate to blindly increase the transmit power to reduce the DTX of the PUCCH. The
DTX of the PUCCH is not only related to the power control of the PUCCH, but also related to
downlink performance. Blindly increasing the transmit power will increase the power between
UEs. Therefore, the configuration principle is to set a target Ps to a tradeoff value on the
premise of ensuring demodulation performance.
3.2.5
SRS Power Control
The power ( PSRS ) for the UE to send a sounding reference signal on sub-frame i is
defined as follows:
PSRS (i )  min{PCMAX , PSRS _ OFFSET  10log10 ( M SRS )  PO _ PUSCH ( j )   ( j )  PL  f (i)}[ dBm]
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
PCMAX represents the maximum transmit power of the UE.

PSRS_OFFSET is a UE-level semi-static parameter configured by higher layers. It is
used to improve the accuracy for estimating the channel quality of the UE. This
parameter corresponds to powerOffsetOfSRS (UL Power Control) in the OMC. The
recommended value is -3 dB.

M SRS represents the number of resource blocks in the SRS transmission
bandwidth on sub-frame i.


3.2.6
f (i ) represents the current PUSCH power control adjustment value.
For details about PO_PUSCH ( j ) and
 ( j ) , refer to section 4.1 ( j  1).
PRACH Open-Loop Power Control
On the UE side, the transmit power of the PRACH is defined as follows:
PPRACH  minPCMAX，PL  PO_PRE   PREAMBLE_Msg 3  Prampup dBm

PO_PRE represents the initial target received power for random access. It is an
open-loop
power
control
parameter,
which
corresponds
to
preambleIniReceivedPower (PRACH) in the OMC.

 PREAMBLE _ Msg 3 is a power offset parameter of Msg3 as compared with that of
random access.
Prampup is calculated based on the preamble power ramp-up step and the number
of random transmission attempts. It is equal to the total power ramp-up from the first
preamble to the last preamble.
Prampup  ( N PRE  1) * dPrampup
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ZTE LTE FDD Power Control Feature Guide
N PRE represents the number of preamble transmission attempts of the UE.

dPrampup
represents the power ramp-up step configured by higher layers, which
corresponds to powerRampingStep (PRACH) in the OMC. The recommended value
is 2 dB.

messagePowerOffsetGroupB
configured
in
the
OMC,
represents
is
related
redundant
to
the
power,
cell,
and
which
can
be
corresponds
to
messagePowerOffsetGroupB (PRACH) in the OMC. The recommended value is 8
dB.
Figure 3-3
UE PRACH power ramp up process
Transmit power
satisfying the target
received power
Adjustment/
Correctness
UE
eNB
RACH preamble
x
RACH preamble
x
+ΔdPrampup
……
RACH preamble
x
3.2.7
(Npre-1)*ΔdPrampup
Configuring the Transmit Power of a Downlink Physical Channel,
Signal, or Logical Channel
For the downlink power configuration, the maximum transmit power is configured based
on the transmission capability of the base station and the actual transmit power is
configured based on the cell coverage requirements. The transmit power of a downlink
physical channel, signal, or logical channel is represented by RE. The cell reference
signal power is absolute power, which is configured to ensure the cell coverage and the
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ZTE LTE FDD Power Control Feature Guide
minimum power. The transmit power of a downlink physical channel, signal, or logical
channel is based on the transmit power of the cell reference signal. The power
compensation of a downlink physical channel, signal, or logical channel is configured in
the OMC and related to the cell reference signal.
3.2.8
Downlink Physical Channel, Signal, or Power Offset
The transmit power of a downlink physical channel (such as PBCH, PDCCH, PCFICH,
and PHICH), primary synchronization signal, or secondary synchronization signal is
determined by the cell reference signal and power offset.
The power offset of the PDCCH is represented by multiple one-dimensional data. Each
element is related to PDCCH format 0/1/2/3.
3.2.9
Power Offset of a Downlink Logical Channel
Multiple logical channels are mapped to the PDSCH, and therefore these logical
channels need to be configured with different power offset values based on the cell
reference signal. For example, the DTCH is configured with the PA based on the UE
services. In addition, Msg2 is carried by the PDSCH, and therefore the corresponding PA
must be configured. The corresponding OMC parameters include paForBCCH (DL
Power Control), paForCCCH (DL Power Control), paForPCCH (DL Power Control),
paForMSG2 (DL Power Control), paForDCCH (DL Power Control), and paForDTCH (DL
Power Control).
4
Key Parameters and Configuration
4.1
PUSCH Open-Loop Power Control
4.1.1
Parameters List
Table 4-1
Parameters List
SN
ZTE Confidential & Proprietary
Parameter Name
Figure
19
ZTE LTE FDD Power Control Feature Guide
1
2
3
4
5
4.1.2
Switch for PUSCH Closed-Loop Power Control
Figure 4-1
Cell Nominal Power Required for Data Transmission in PUSCH Semi-Static
Figure 4-2
Scheduling Authorization Mode
Cell Nominal Power Required for Data Transmission in PUSCH Dynamic
Figure 4-2
Scheduling Authorization Mode
Path Loss Compensation Factor for PUSCH Transmission Power
Figure 4-2
PUSCH Power Offset of UE in Dynamic Schedule or Semi-Static
Scheduling
Figure 4-3
Parameter Configuration Rule
Table 4-2
S
N
Configuration rule of parameters
MO
Nam
Short
Name
Description
e
UL
Contr
for
CH
Loop
Power
Control
Range
Value
-BPL0:
LPCofPUS
Closed-
Default
Normal-FDD
Switch
PUSCH
Value
switchForC
Power
ol
1
Name
Close,
The parameter indicates
the cell whether enable
0:Close,1:
close-loop power control
Open
of PUSCH or not.
Normal-BPL
1:Open,
AirLine:
Close,
HighWay:
Close
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ZTE LTE FDD Power Control Feature Guide
UL
Cell
p0Nominal
Power
Nominal
PUSCH
Contr
Power
ol
Require
The parameter indicates
the cell specific nominal
d for
power for PUSCH
Data
(re)transmissions
Transmi
corresponding to a
ssion in
2
semi-persistent grant.
PUSCH
The parameter is used to
Semi-St
[-126,24]
unit dBm
-75dBm
calculate the transmit
atic
power of PUSCH, and
Schedul
embodys the power
ing
difference among cells.
Authoriz
ation
Mode
UL
Cell
poNominal
Power
Nominal
PUSCH1
Contr
Power
The parameter indicates
ol
Require
the cell specific nominal
d for
power for PUSCH
Data
(re)transmissions
Transmi
corresponding to a
ssion in
dynamic scheduled
[-126,24]
PUSCH
grant. The parameter is
unit dBm
Dynami
used to calculate the
c
transmit power of
Schedul
PUSCH, and embody
ing
the power difference
Authoriz
among cells.
3
-75
ation
Mode
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ZTE LTE FDD Power Control Feature Guide
UL
Power
Contr
ol
Path
alpha
calculate the transmit
Loss
power of PUSCH and is
Compen
sation
Factor
4
The parameter is used to
for
PUSCH
Transmi
used to compensate the
0:0,1:0.4,
cell pathloss
2:0.5,3:0.
Normal:0.8,
corresponding to a
6,4:0.7,5:
AirLine:1,
semi-persistent grant
0.8,6:0.9,
HighWay:0.8
and a dynamic
7:1.0
scheduled grant. The
ssion
parameter is a cell
Power
specific parameter.
UL
PUSCH
p0UePusc
Power
Power
h1Pub
Contr
Offset of
UE specific component
ol
UE in
for PUSCH
Dynami
(re)transmissions
c
corresponding to a
[-8,7] unit
Schedul
dynamic scheduled grant
dB
e or
or semi-staticscheduled
Semi-St
grant(common initial
atic
value)
5
1
Schedul
ing
4.1.3
Configuration Description
4.1.3.1
Function Activation
To activate the PUSCH open loop power control, in the Configuration Management
window of the EMS, select Modify Area > Radio Parameter > LTE FDD > E-UTRAN
FDD Cell > UL Power Control. Click the
button, set the Switch for PUSCH
Closed-Loop Power Control parameter to Close[0], as shown in Figure 4-1. Click the
button.
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ZTE LTE FDD Power Control Feature Guide
Figure 4-1
4.1.3.2
Configuring to active PUSCH Open-Loop Power Control
Configuring Other Relevant Parameters
To test if the parameters of PUSCH Open-Loop power control can be normally delivered
as configured in the network management system, in the Configuration Management
window of the EMS, select Modify Area > Radio Parameter > LTE FDD > E-UTRAN
FDD Cell > UL Power Control. Click the
shown in Figure 4-2 and Figure 4-3. Click the
ZTE Confidential & Proprietary
button, configure the parameters as
button.
23
ZTE LTE FDD Power Control Feature Guide
24
Figure 4-2
Configuring the parameters of PUSCH Open-Loop power control
Figure 4-3
Configuring the parameter of PUSCH Power Offset
ZTE Confidential & Proprietary
ZTE LTE FDD Power Control Feature Guide
4.1.3.3
Function Deactivation
To deactivate the PUSCH open loop power control, in the Configuration Management window
of the EMS, select Modify Area > Radio Parameter > LTE FDD > E-UTRAN FDD Cell > UL
Power Control. Click the
button, set the Switch for PUSCH Closed-Loop Power Control
parameter to Open[1], as shown in Figure 4-4. Click the
button, and then synchronize the
data to the eNodeB.
Figure 4-4
4.1.3.4
Configuring to deactivate PUSCH Open-Loop Power Control
Data Synchronization
Select [Configuration Management->Data Synchronization] from the main menu of the
Configuration Management tab. The Data Synchronization dialog box opens. First select NE,
then select synchronization mode as Incremental synchronization, last click Synchronize
button.
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ZTE LTE FDD Power Control Feature Guide
4.2
4.2.1
PUSCH Closed-Loop Power Control
Parameters List
Table 4-3
Parameters List
SN
Figure
1
Switch for PUSCH Closed-Loop Power Control
Figure 4-5
2
Power Control Adjust Accumulation Enabled
Figure 4-6
3
Downlink Period RSRP Measurement Switch
Figure 4-6
4
PUSCH Indicated By PDCCH DCI 3/3A Valid or Not
Figure 4-9
Power Control Step Range for PDCCH DCI 3/3A Indicated PUSCH TPC
Figure 4-9
5
6
7
8
9
4.2.2
Parameters Name
Command
Figure 4-7
Cell Nominal Power Required for Data Transmission in PUSCH Semi-Static
Scheduling Authorization Mode
Figure 4-7
Cell Nominal Power Required for Data Transmission in PUSCH Dynamic
Scheduling Authorization Mode
Path Loss Compensation Factor for PUSCH Transmission Power
Figure 4-7
PUSCH Power Offset of UE in Dynamic Schedule or Semi-Static
Figure 4-8
Scheduling
Parameter Configuration Rule
Table 4-4
Configuration rule of parameters
S
MO
N
Name
Name
UL
Power
Control
Description
Value
Default
Range
Value
switchForCLPC
Switch
for
PUSCH
1
Short Name
Closed-L
oop
Power
Control
ofPUSCH
Normal-FDD
The parameter
-BPL0:Close,
indicates the cell
Normal-BPL
whether enable
enum(Clo
1:Open,
close-loop
se,Open)
AirLine:Clos
power control of
e,
PUSCH or not.
HighWay:Clo
se
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2
UL
Power
puschPCAdjTyp
Power
Control
e
Control
Adjust
Accumul
ation
Enabled
3
The parameter
0:Current
indicates the
Absolute,
power control
1:Accumu
adjust type for
lation,2:A
PUSCH.
dapter
UL
Downlink
rsrpPeriodMeas
Control switch of
Power
Period
SwitchDl
period RSRP
Control
RSRP
measure switch
0:Close,1:
Measure
can determine
Open
ment
which are
Switch
enabled or not.
UL
PUSCH
switchForDCI3A
Power
Indicated
3Pusch
Control
By
4
PDCCH
DCI 3/3A
DCI3A3 Switch
0:No,1:Ye
for PUSCH
s
Current
absolute[0]
Close[0]
No[0]
Valid or
Not
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ZTE LTE FDD Power Control Feature Guide
UL
dCI3A3SelPusc
0: Format
Power
h
3A Power
Control
Control
Adjust
Step[-1,1],
5
Power
When the Power
1: Format
Control
control Adjust
3 Power
Step
type for PUSCH
Control
Range
is accumulation,
Adjust
Format 3
for
the parameter is
Step[-1,0,
Power
PDCCH
used to select
1,3],
Control
DCI 3/3A
the range of
2: Format
Adjust
Indicated
TPC command
3A Power
Step[-1,0,1,3
PUSCH
step size of
Control
][1]
TPC
PUSCH for
Adjust
Comman
PDCCH DCI
Step[-1,1]
d
format 3/3A.
or Format
3 Power
Control
Adjust
Step[-1,0,
1,3]
UL
p0NominalPUS
The parameter
Power
CH
indicates the cell
Control
6
Cell
specific nominal
Nominal
power for
Power
PUSCH
Required
(re)transmission
for Data
s corresponding
Transmis
to a
sion in
semi-persistent
PUSCH
grant. The
Semi-Sta
parameter is
tic
used to
Scheduli
calculate the
ng
transmit power
Authoriz
of PUSCH, and
ation
embodys the
Mode
power
[-126,24]
unit dBm
-75.
difference
among cells.
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ZTE Confidential & Proprietary
ZTE LTE FDD Power Control Feature Guide
UL
poNominalPUS
The parameter
Power
CH1
indicates the cell
Control
specific nominal
Cell
power for
Nominal
PUSCH
Power
(re)transmission
Required
s corresponding
for Data
to a dynamic
Transmis
scheduled
sion in
7
grant. The
PUSCH
parameter is
Dynamic
[-126,24]
unit dBm
-75
used to
Scheduli
calculate the
ng
transmit power
Authoriz
of PUSCH, and
ation
embody the
Mode
power
difference
among cells.
UL
alpha
The parameter
Power
is used to
Control
calculate the
transmit power
8
Path
of PUSCH and
Loss
is used to
Compen
compensate the
sation
cell pathloss
Factor
corresponding
for
to a
PUSCH
semi-persistent
Transmis
grant and a
sion
dynamic
Power
scheduled
0:0,1:0.4,
2:0.5,3:0.
Normal:0.8,
6,4:0.7,5:
AirLine:1,
0.8,6:0.9,
HighWay:0.8
7:1.0
grant. The
parameter is a
cell specific
parameter.
ZTE Confidential & Proprietary
29
ZTE LTE FDD Power Control Feature Guide
UL
Power
Control
PUSCH
Power
p0UePusch1Pu
UE specific
b
component for
Offset of
UE in
Dynamic
Schedul
9
e or
Semi-Sta
tic
Scheduli
ng
4.2.3
Configuration Description
4.2.3.1
Function Activation
PUSCH
(re)transmission
s corresponding
to a dynamic
[-8,7] unit
scheduled grant
dB
1
or
semi-staticsche
duled
grant(common
initial value)
To activate the PUSCH open loop power control, in the Configuration Management
window of the EMS, select Modify Area > Radio Parameter > LTE FDD > E-UTRAN
FDD Cell > UL Power Control. Click the
button, set the Switch for PUSCH
Closed-Loop Power Control parameter to Open[1], as shown in Figure 4-5. Click the
button.
30
ZTE Confidential & Proprietary
ZTE LTE FDD Power Control Feature Guide
Figure 4-5
4.2.3.2
Configuring to active PUSCH Close-Loop Power Control
Configuring Other Relevant Parameters
1.
To test different PUSCH closed loop power control types, in the Configuration
Management window of the EMS, select Modify Area > Radio Parameter > LTE
FDD > E-UTRAN FDD Cell > UL Power Control. Click the
button, set the
PUSCH power control adjustment type parameter. When the PUSCH power
control adjustment type parameter is set to Accumulation[1], set the DownLink
period RSRP measure switch parameter to Open[1] (otherwise, retain its default
value) , as shown in Figure 4-6. Click the
ZTE Confidential & Proprietary
button.
31
ZTE LTE FDD Power Control Feature Guide
Figure 4-6
2.
Configuring PUSCH closed loop power control types
To test if the parameters of PUSCH Close-Loop power control can be normally
delivered as configured in the network management system, in the Configuration
Management window of the EMS, select Modify Area > Radio Parameter > LTE
FDD > E-UTRAN FDD Cell > UL Power Control. Click the
the parameters as shown in Figure 4-7 and Figure 4-8. Click the
32
button, configure
button.
ZTE Confidential & Proprietary
ZTE LTE FDD Power Control Feature Guide
Figure 4-7
Configuring the parameters of PUSCH Open-Loop power control
ZTE Confidential & Proprietary
33
ZTE LTE FDD Power Control Feature Guide
Figure 4-8
3.
Configuring the Parameter of PUSCH Power Offset
To test if DCI3/3A can deliver a TPC, in the Configuration Management window of
the EMS, select Modify Area > Radio Parameter > LTE FDD > E-UTRAN FDD
Cell > UL Power Control. Click the
button, set the PUSCH indicated by
PDCCH DCI 3/3A valid or not parameter to Yes[1], as shown in Figure 4-9. Click
the
34
button.
ZTE Confidential & Proprietary
ZTE LTE FDD Power Control Feature Guide
Figure 4-9
4.2.3.3
Configuring DCI3/3A Parameters
Function Deactivation
To deactivate the PUSCH open loop power control, in the Configuration Management
window of the EMS, select Modify Area > Radio Parameter > LTE FDD > E-UTRAN
FDD Cell > UL Power Control. Click the
button, set the Switch for PUSCH
Closed-Loop Power Control parameter to Close[0], as shown in Figure 4-10. Click the
button, and then synchronize the data to eNodeB.
ZTE Confidential & Proprietary
35
ZTE LTE FDD Power Control Feature Guide
Figure 4-10
4.2.3.4
Configuring to deactivate PUSCH Close-Loop Power Control
Data Synchronization
Select [Configuration Management->Data Synchronization] from the main menu of
the Configuration Management tab. The Data Synchronization dialog box opens. First
select NE, then select synchronization mode as Incremental synchronization, last click
Synchronize button.
4.3
4.3.1
PUCCH Open-Loop Power Control
Parameters List
Table 4-5
SN
36
Parameters List
Parameters Name
Figure
1
Switch for PUCCH Closed-Loop Power Control
Figure 4-11
2
Related Nominal Power Used By PUCCH Physical Channel
Figure 4-12
3
Physical Channel Power Compensation for PUCCH Format 1
Figure 4-12
ZTE Confidential & Proprietary
ZTE LTE FDD Power Control Feature Guide
4.3.2
4
Physical Channel Power Compensation for PUCCH Format 1b
Figure 4-12
5
Physical Channel Power Compensation for PUCCH Format 2
Figure 4-12
6
Physical Channel Power Compensation for PUCCH Format 2a
Figure 4-12
7
Physical Channel Power Compensation for PUCCH Format 2b
Figure 4-12
8
PUCCH Power Offset of UE
Figure 4-13
Parameter Configuration Rule
Table 4-6
S
Configuration rule of parameters
MO Name
Short Name
Name
N
UL Power
Control
1
Switch for
PUCCH
Description
switchForCLPCof
The parameter
PUCCH
indicates the cell
Closed-Loo
p Power
Range
whether enable
0:Close,1:
close-loop power
Open
Defa
ult
Value
Open
control of
Control
PUCCH or not.
UL Power
poNominalPUCC
The parameter
Control
H
indicates the cell
specific nominal
Related
power for
Nominal
PUCCH. And it is
Power
2
Value
Used By
PUCCH
used to calculate
[-127,-96]
-105d
the transmit
unit dbm
Bm
power for
Physical
PUCCH and
Channel
embodys the
power difference
among cells.
UL Power
Physical
deltaFPucchFor
The parameter
Control
Channel
mat1
indicates the
3
ZTE Confidential & Proprietary
Power
power offset for
Compensat
different PUCCH
ion for
Format 1 with
PUCCH
PUCCH Format
Format 1
1a.
0:-2,1:0,2:
2
2[2]
37
ZTE LTE FDD Power Control Feature Guide
UL Power
Physical
deltaFPucchFor
The parameter
Control
Channel
mat1b
indicates the
4
Power
power offset for
Compensat
different PUCCH
ion for
Format 1b with
PUCCH
PUCCH Format
Format 1b
1a.
UL Power
Physical
deltaFPucchFor
The parameter
Control
Channel
mat2
indicates the
5
Power
power offset for
Compensat
different PUCCH
ion for
Format 2 with
PUCCH
PUCCH Format
Format 2
1a.
UL Power
Physical
deltaFPucchFor
The parameter
Control
Channel
mat2a
indicates the
6
Power
power offset for
Compensat
different PUCCH
ion for
Format 2a with
PUCCH
PUCCH Format
Format 2a
1a.
UL Power
Physical
deltaFPucchFor
The parameter
Control
Channel
mat2b
indicates the
7
Power
power offset for
Compensat
different PUCCH
ion for
Format 2b with
PUCCH
PUCCH Format
Format 2b
1a.
UL Power
p0UePucchPub
Control
0:-2,1:0,2:
1,3:2
0:-2,1:0,2:
2
0:-2,1:0,2:
2
3[1]
1[2]
2[2]
2[2]
UE specific
component for
PUCCH
8
0:1,1:3,2:5
Power
Offset of
UE
PUSCH
(re)transmissions
corresponding to
a dynamic
[-8,7] unit
dB
1dB
scheduled
grant(common
initial value)
38
ZTE Confidential & Proprietary
ZTE LTE FDD Power Control Feature Guide
4.3.3
Configuration Description
4.3.3.1
Function Activation
To activate the PUCCH open loop power control, in the Configuration Management
window of the EMS, select Modify Area > Radio Parameter > LTE FDD > E-UTRAN
FDD Cell > UL Power Control. Click the
button, set the Switch for PUCCH
Closed-Loop Power Control parameter to Close[0], as shown in Figure 4-11. Click the
button.
Figure 4-11
4.3.3.2
Configuring to active PUCCH Open-Loop Power Control
Configuring Other Relevant Parameters
To test if the parameters of PUCCH Open-Loop power control can be normally delivered
as configured in the network management system, in the Configuration Management
window of the EMS, select Modify Area > Radio Parameter > LTE FDD > E-UTRAN
FDD Cell > UL Power Control. Click the
shown in Figure 4-12 and Figure 4-13. Click the
ZTE Confidential & Proprietary
button, configure the parameters as
button.
39
ZTE LTE FDD Power Control Feature Guide
Figure 4-12
40
Configuring the Parameters of PUCCH Open-Loop Power Control
ZTE Confidential & Proprietary
ZTE LTE FDD Power Control Feature Guide
Figure 4-13
4.3.3.3
Configuring the Parameter of PUCCH Power Offset of UE
Function Deactivation
To deactivate the PUCCH open loop power control, in the Configuration Management
window of the EMS, select Modify Area > Radio Parameter > LTE FDD > E-UTRAN
FDD Cell > UL Power Control. Click the
button, set the Switch for PUCCH
Closed-Loop Power Control parameter to Open[1], as shown in Figure 4-14. Click the
button, and then synchronize the data to eNodeB.
ZTE Confidential & Proprietary
41
ZTE LTE FDD Power Control Feature Guide
Figure 4-14
4.3.3.4
Configuring to deactivate PUCCH Open-Loop Power Control
Data Synchronization
Select [Configuration Management->Data Synchronization] from the main menu of
the Configuration Management tab. The Data Synchronization dialog box opens. First
select NE, then select synchronization mode as Incremental synchronization, last click
Synchronize button.
4.4
4.4.1
PUCCH Close-Loop Power Control
Parameters List
Table 4-7
SN
42
Parameters List
Parameters Name
Figure
1
Switch for PUCCH Closed-Loop Power Control
Figure 4-15
2
PUCCH Indicated By PDCCH DCI 3/3A Valid or Not
Figure 4-18
ZTE Confidential & Proprietary
ZTE LTE FDD Power Control Feature Guide
3
4.4.2
Power Control Step Range for PDCCH DCI 3/3A Indicated PUCCH TPC
Figure 4-18
Command
4
Related Nominal Power Used By PUCCH Physical Channel
Figure 4-16
5
Physical Channel Power Compensation for PUCCH Format 1
Figure 4-16
6
Physical Channel Power Compensation for PUCCH Format 1b
Figure 4-16
7
Physical Channel Power Compensation for PUCCH Format 2
Figure 4-16
8
Physical Channel Power Compensation for PUCCH Format 2a
Figure 4-16
9
Physical Channel Power Compensation for PUCCH Format 2b
Figure 4-16
10
PUCCH Power Offset of UE
Figure 4-17
Parameter Configuration Rule
Table 4-8
Configuration rule of parameters
S
MO
N
Name
Name
Short
Description
Name
UL Power
Switch for
switchForCL
The parameter
Control
PUCCH
PCofPUCCH
indicates the cell
1
Defaul
Range
t Value
Closed-L
whether enable
0:Close,1:
oop
close-loop power
Open
Power
control of PUCCH or
Control
not.
UL Power
PUCCH
switchForDCI
Control
Indicated
3A3Pucch
By
2
Value
PDCCH
DCI 3/3A
Switch for DCI3A or
DCI3 for PUCCH
0:No,1:Yes
Open[1]
No[0]
Valid or
Not
ZTE Confidential & Proprietary
43
ZTE LTE FDD Power Control Feature Guide
UL Power
dCI3A3SelPu
0: Format
Control
sch
3A Power
Control
Adjust
Step[-1,1],
1: Format
Power
3 Power
Control
Control
Step
Range for
PDCCH
3
DCI 3/3A
Indicated
PUCCH
TPC
The parameter is used
Adjust
to select the range of
Step[-1,0,1
TPC command step
,3],
size of PUCCH for
2: Format
PDCCH DCI format
3A Power
3/3a.
Control
Format
3
Power
Control
Adjust
Step[-1,
0,1,3][1]
Adjust
Comman
Step[-1,1]
d
or Format
3 Power
Control
Adjust
Step[-1,0,1
,3]
UL Power
Control
Related
poNominalP
The parameter
UCCH
indicates the cell
specific nominal
Nominal
power for PUCCH.
Power
Used By
4
PUCCH
And it is used to
[-127,-96]
-105dB
calculate the transmit
unit dbm
m
power for PUCCH and
Physical
embodys the power
Channel
difference among
cells.
5
UL Power
Physical
deltaFPucc
Control
Channel
hFormat1
The parameter
Power
indicates the power
Compens
offset for different
ation for
PUCCH Format 1 with
PUCCH
PUCCH Format 1a.
0:-2,1:0,2:
2
2[2]
Format 1
44
ZTE Confidential & Proprietary
ZTE LTE FDD Power Control Feature Guide
UL Power
Physical
deltaFPucc
Control
Channel
hFormat1b
6
The parameter
Power
indicates the power
Compens
offset for different
ation for
PUCCH Format 1b
PUCCH
with PUCCH Format
Format
1a.
0:1,1:3,2:5
3[1]
1b
UL Power
Physical
deltaFPucc
Control
Channel
hFormat2
7
The parameter
Power
indicates the power
Compens
offset for different
ation for
PUCCH Format 2 with
PUCCH
PUCCH Format 1a.
0:-2,1:0,2:
1,3:2
1[2]
Format 2
UL Power
Physical
deltaFPucc
Control
Channel
hFormat2a
8
The parameter
Power
indicates the power
Compens
offset for different
0:-2,1:0,2:
ation for
PUCCH Format 2a
2
PUCCH
with PUCCH Format
Format
1a.
2[2]
2a
UL Power
Physical
deltaFPucc
Control
Channel
hFormat2b
9
The parameter
Power
indicates the power
Compens
offset for different
0:-2,1:0,2:
ation for
PUCCH Format 2b
2
PUCCH
with PUCCH Format
Format
1a.
2[2]
2b
10
UL Power
Control
p0UePucchP
UE specific
ub
component for
PUCCH
PUSCH
Power
(re)transmissions
[-8,7] unit
Offset of
corresponding to a
dB
UE
dynamic scheduled
1dB
grant(common initial
value)
ZTE Confidential & Proprietary
45
ZTE LTE FDD Power Control Feature Guide
4.4.3
Configuration Description
4.4.3.1
Function Activation
To activate the PUCCH open loop power control, in the Configuration Management
window of the EMS, select Modify Area > Radio Parameter > LTE FDD > E-UTRAN
FDD Cell > UL Power Control. Click the
button, set the Switch for PUCCH
Closed-Loop Power Control parameter to Open[1], as shown in Figure 4-15. Click the
button.
Figure 4-15
4.4.3.2
Configuring to active PUCCH Close-Loop Power Control
Configuring Other Relevant Parameters
1.
To test if the parameters of PUCCH Close-Loop power control can be normally
delivered as configured in the network management system, in the Configuration
Management window of the EMS, select Modify Area > Radio Parameter > LTE
FDD > E-UTRAN FDD Cell > UL Power Control. Click the
the parameters as shown in Figure 4-16. Click the
46
button, configure
button.
ZTE Confidential & Proprietary
ZTE LTE FDD Power Control Feature Guide
Figure 4-16
Configuring the parameters of PUCCH Close-Loop power control
Figure 4-17
Configuring the Parameter of PUCCH Power Offset of UE
ZTE Confidential & Proprietary
47
ZTE LTE FDD Power Control Feature Guide
2.
To test if DCI3/3A can deliver a TPC, in the Configuration Management window of
the EMS, select Modify Area > Radio Parameter > LTE FDD > E-UTRAN FDD
Cell > UL Power Control. Click the
button, set the PUSCH indicated by
PDCCH DCI 3/3A valid or not parameter to Yes[1], as shown in Figure 4-18. Click
the
Figure 4-18
4.4.3.3
button.
Configuring DCI3/3A Parameters
Function Deactivation
To deactivate the PUCCH open loop power control, in the Configuration Management
window of the EMS, select Modify Area > Radio Parameter > LTE FDD > E-UTRAN
FDD Cell > UL Power Control. Click the
button, set the Switch for PUCCH
Closed-Loop Power Control parameter to Close[0], as shown in Figure 4-19. Click the
button, and then synchronize the data to eNodeB.
48
ZTE Confidential & Proprietary
ZTE LTE FDD Power Control Feature Guide
Figure 4-19
4.4.3.4
Configuring to deactivate PUCCH Close-Loop Power Control
Data Synchronization
Select [Configuration Management->Data Synchronization] from the main menu of
the Configuration Management tab. The Data Synchronization dialog box opens. First
select NE, then select synchronization mode as Incremental synchronization, last click
Synchronize button.
4.5
4.5.1
SRS Power Control
Parameters List
Table 4-9
Parameters List
SN
Parameters Name
Figure
1
Switch for PUSCH Closed-Loop Power Control
Figure 4-20
2
Power Control Adjust Accumulation Enabled
Figure 4-21
3
Downlink Period RSRP Measurement Switch
Figure 4-21
ZTE Confidential & Proprietary
49
ZTE LTE FDD Power Control Feature Guide
4
5
6
Figure 4-25
Power Control Step Range for PDCCH DCI 3/3A Indicated PUSCH TPC
Figure 4-25
Command
Cell Nominal Power Required for Data Transmission in PUSCH Dynamic
Figure 4-22
Scheduling Authorization Mod
7
Path Loss Compensation Factor for PUSCH Transmission Powe
Figure 4-22
8
Power Offset of SRS Relative to PUSCH
Figure 4-23
PUSCH Power Offset of UE in Dynamic Schedule or Semi-Static
Figure 4-24
9
4.5.2
PUSCH Indicated By PDCCH DCI 3/3A Valid or Not
Scheduling
Parameter Configuration Rule
Table 4-10
Configuration rule of parameters
S
MO
N
Name
Name
UL
Power
Control
Switch
Short
Value
Default
Range
Value
switchForC
Normal-F
LPCofPUC
DD-BPL0:
CH
for
PUCCH
1
Description
Name
Closed-L
oop
Power
Control
The parameter
Close,
indicates the cell
Normal-B
whether enable
0:Close,1:Op
PL1:Open
close-loop power
en
,
control of PUSCH or
AirLine:Cl
not.
ose,
HighWay:
Close
2
UL
Power
puschPCA
Power
Control
djType
Control
The parameter
0:Current
Adjust
indicates the power
Absolute,1:A
Accumul
control adjust type for
ccumulation,
ation
PUSCH.
2:Adapter
Current
Absolute[
0]
Enabled
50
ZTE Confidential & Proprietary
ZTE LTE FDD Power Control Feature Guide
3
UL
Downlink
rsrpPeriod
Power
Period
MeasSwitc
Control
RSRP
hDl
Measure
period RSRP
measure switch can
determine which are
ment
0:Close,1:Op
en
Close[0]
enabled or not.
Switch
UL
PUSCH
switchForD
Power
Indicated
CI3A3Pusc
Control
By
h
4
Control switch of
PDCCH
DCI3A3 Switch for
PUSCH
DCI 3/3A
0:No,1:Yes
No[0]
Valid or
Not
UL
dCI3A3Sel
0: Format 3A
Power
Pusch
Power
Control
Control
Adjust
Step[-1,1],
Power
5
1: Format 3
Control
When the Power
Power
Step
control Adjust type
Control
Range
for PUSCH is
Adjust
Format 3
for
accumulation, the
Step[-1,0,1,3
Power
PDCCH
parameter is used to
],
Control
DCI 3/3A
select the range of
2: Format 3A
Adjust
Indicated
TPC command step
Power
Step[-1,0,
PUSCH
size of PUSCH for
Control
1,3][1]
TPC
PDCCH DCI format
Adjust
Comman
3/3A.
Step[-1,1] or
d
Format 3
Power
Control
Adjust
Step[-1,0,1,3
]
ZTE Confidential & Proprietary
51
ZTE LTE FDD Power Control Feature Guide
UL
Cell
poNominal
The parameter
Power
Nominal
PUSCH1
indicates the cell
Control
Power
specific nominal
Required
power for PUSCH
for Data
(re)transmissions
Transmis
corresponding to a
sion in
dynamic scheduled
[-126,24] unit
PUSCH
grant. The parameter
dBm
Dynamic
is used to calculate
Scheduli
the transmit power of
ng
PUSCH, and
Authoriz
embody the power
ation
difference among
Mod
cells.
6
UL
alpha
The parameter is
Power
Path
used to calculate the
Control
Loss
transmit power of
Compen
PUSCH and is used
sation
to compensate the
0:0,1:0.4,2:0.
Factor
cell pathloss
5,3:0.6,4:0.7,
for
corresponding to a
5:0.8,6:0.9,7:
PUSCH
semi-persistent grant
1.0
Transmis
and a dynamic
sion
scheduled grant. The
Power
parameter is a cell
7
-75
Normal:0.
8,
AirLine:1,
HighWay:
0.8
specific parameter.
UL
powerOffse
When UE calculates
Power
tOfSRS
the transmit power
Control
for sounding
reference signal, UE
8
Power
will add the
Offset of
parameter to the
SRS
transmit power for
Relative
PUSCH. When Ks =
to
1.25, the actual
PUSCH
parameter value is
[0..15]
5
PoSRS - 3. When Ks
= 0, the actual
parameter value is
-10.5 + 1.5 * PoSRS.
52
ZTE Confidential & Proprietary
ZTE LTE FDD Power Control Feature Guide
UL
PUSCH
p0UePusc
Power
Power
h1Pub
Control
Offset
UE specific
of UE in
component for
Dynami
PUSCH
c
(re)transmissions
Schedul
corresponding to a
e or
dynamic scheduled
Semi-St
grant(common initial
atic
value)
9
[-8,7] unit dB
1dB
Schedul
ing
4.5.3
Configuration Description
4.5.3.1
Function Activation
SRS Power Control includes Open Loop Power Control and Close Loop Power Control.
SRS Power Control type is controlled by the Switch for PUSCH Closed-Loop Power Control.
SRS Power Control employs Close Loop Power Control when the Switch for PUSCH
Closed-Loop Power Control is open, otherwise, SRS Power Control employs Open Loop
Power Control.
In the Configuration Management window of the EMS, select Modify Area > Radio
Parameter > LTE FDD > E-UTRAN FDD Cell > UL Power Control. Click the
button,
set the Switch for PUCCH Closed-Loop Power Control parameter to Close[0] or
Open[1] respectively, so that SRS Power Control employs Open Loop Power Control or
Close Loop Power Control, as shown in Figure 4-20. Click the
ZTE Confidential & Proprietary
button.
53
ZTE LTE FDD Power Control Feature Guide
Figure 4-20
4.5.3.2
Configuring SRS Power Control type
Configuring Other Relevant Parameters
1.
To test different SRS closed loop power control types, in the Configuration
Management window of the EMS, select Modify Area > Radio Parameter > LTE
FDD > E-UTRAN FDD Cell > UL Power Control. Click the
button, set the
PUSCH power control adjustment type parameter. When the PUSCH power
control adjustment type parameter is set to Accumulation[1], set the DownLink
period RSRP measure switch parameter to Open[1] (otherwise, retain its default
value) , as shown in Figure 4-21. Click the
54
button.
ZTE Confidential & Proprietary
ZTE LTE FDD Power Control Feature Guide
Figure 4-21
2.
Configuring SRS Close Loop Power Control Type
To test if the parameters of SRS power control can be normally delivered as
configured in the network management system, in the Configuration Management
window of the EMS, select Modify Area > Radio Parameter > LTE FDD >
E-UTRAN FDD Cell > UL Power Control. Click the
button, configure the
parameters as shown in Figure 4-22, Figure 4-23 and Figure 4-24. Click the
button.
ZTE Confidential & Proprietary
55
ZTE LTE FDD Power Control Feature Guide
56
Figure 4-22
Configuring the parameters of SRS power control
Figure 4-23
Configuring the Parameter of Power Offset of SRS Relative to PUSCH
ZTE Confidential & Proprietary
ZTE LTE FDD Power Control Feature Guide
Figure 4-24
3.
Configuring the Parameter of PUSCH Power offset of UE
To test if DCI3/3A can deliver a TPC, in the Configuration Management window of
the EMS, select Modify Area > Radio Parameter > LTE FDD > E-UTRAN FDD
Cell > UL Power Control. Click the
button, set the PUSCH indicated by
PDCCH DCI 3/3A valid or not parameter to Yes[1], as shown in Figure 4-25. Click
the
button.
ZTE Confidential & Proprietary
57
ZTE LTE FDD Power Control Feature Guide
Figure 4-25
4.5.3.3
Configuring DCI3/3A Parameters
Function Deactivation
In the Configuration Management window of the EMS, select Modify Area > Radio
Parameter > LTE FDD > E-UTRAN FDD Cell > UL Power Control. Click the
button,
set the Switch for PUCCH Closed-Loop Power Control parameter to Close[0] or
Open[1] respectively, so that SRS Power Control employs Open Loop Power Control or
Close Loop Power Control, as shown in Figure 4-20.
4.5.3.4
Data Synchronization
Select [Configuration Management->Data Synchronization] from the main menu of
the Configuration Management tab. The Data Synchronization dialog box opens. First
select NE, then select synchronization mode as Incremental synchronization, last click
Synchronize button.
58
ZTE Confidential & Proprietary
ZTE LTE FDD Power Control Feature Guide
4.6
4.6.1
PRACH Power Control
Parameters List
Table 4-11
Parameters List
SN
4.6.2
Parameters Name
Figure
1
Power Offset Based on PRACH Message
Figure 4-26
2
PRACH Initial Preamble Transmission Power
Figure 4-27
3
PRACH Power Ascending Step
Figure 4-27
4
Transmission Power Offset of Group B Preamble
Figure 4-27
Parameter Configuration Rule
Table 4-12
Configuration rule of parameters
MO
S
Name
N
Short Name
Name
Defa
Description
Value
ult
Range
Valu
e
1
UL Power
deltaPreambleMs
The parameter is
Control
g3
a message-based
Power
Offset
Based on
PRACH
Message
offset used to
compensate the
power offset for
different PREACH
[-1..6]
0
message format
and is a cell
specific
parameter.
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2
PRACH
preambleIniRecei
PRACH
vedPower
Initial
Preamble
Transmis
sion
Power
0:-120,1:-11
The parameter
8,2:-116,3:-1
indicates initial
14,4:-112,5:-
power for
110,6:-108,7
preamble of
:-106,8:-104,
PRACH. It is that
9:-102,10:-1
the first transmit
00,11:-98,12
power.
:-96,13:-94,1
-100[
10]
4:-92,15:-90
3
PRACH
powerRampingSt
If no Random
ep
Access Response
is received by UE
after UE
transmitted
Random Access
PRACH
Preamble, UE will
Norm
increase transmit
al:2,
power for PRACH
Power
by Power step
Ascendin
and retry to
g Step
0:0,1:2,2:4,3
:6
AirLin
e:6,
High
transmit Random
Way:
Access Preamble
6
until
Preamble_Trans
mission_Counter
is equal to
Max_retransmit_n
umber_for_prach.
4
PRACH
Transmis
sion
Power
Offset of
Group B
Preamble
messagePowerOf
The parameter is
fsetGroupB
a power control
margin for
message 3
0:Minusinfini
transmission
configured by the
eNB and is used
to select the
ty,1:0,2:5,3:
8,4:10,5:12,
8[3]
6:15,7:18
Random Access
Preambles group
A or group B.
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4.6.3
Configuration Description
4.6.3.1
Function Activation
PRACH Power control is enabled acquiescently. There is no switch to control it.
4.6.3.2
Configuring Other Relevant Parameters
1.
To test if the Power offset based on PRACH message parameter can be normally
delivered as configured in the network management system, in the Configuration
Management window of the EMS, select Modify Area > Radio Parameter > LTE
FDD > E-UTRAN FDD Cell > UL Power Control. Click the
the parameters as shown in Figure 4-26. Click the
Figure 4-26
2.
button; configure
button.
Configuring the Power offset based on PRACH message parameter
To test if the other parameters of PRACH Power Control can be normally delivered
as configured in the network management system, in the Configuration
Management window of the EMS, select Modify Area > Radio Parameter > LTE
FDD > E-UTRAN FDD Cell > PRACH. Click the
parameters as shown in Figure 4-27. Click the
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button, configure the
button.
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ZTE LTE FDD Power Control Feature Guide
Figure 4-27
4.6.3.3
Configuring the other parameters of PUCCH Close-Loop power control
Function Deactivation
PRACH Power control is enabled acquiescently. There is no switch to control it.
4.6.3.4
Data Synchronization
Select [Configuration Management->Data Synchronization] from the main menu of
the Configuration Management tab. The Data Synchronization dialog box opens. First
select NE, then select synchronization mode as Incremental synchronization, last click
Synchronize button.
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4.7
4.7.1
Downlink Power Allocation
Parameters List
Table 4-13
Parameters List
SN
4.7.2
Parameters Name
Figure
1
Referenced Signal Power of BP Resource
Figure 4-28
2
Power Offset Between BCCH and Cell RS (P_A_BCCH)
Figure 4-29
3
Power Offset Between CCCH and Cell RS (P_A_CCCH)
Figure 4-29
4
Power Offset Between PCCH and Cell RS (P_A_PCCH)
Figure 4-29
5
Power Offset Between MSG2 and Cell RS (P_A_MSG2)
Figure 4-29
6
Power Offset Between DCCH and Cell RS (P_A_DCCH)
Figure 4-29
7
Power Offset Between PDSCH and Cell RS (P_A_DTCH)
Figure 4-29
Parameter Configuration Rule
Table 4-14
Configuration rule of parameters
MO
S
Short
Name
N
1
Name
Name
Description
Valu
Defa
e
ult
Rang
Valu
e
e
Baseban
Referenc
cpSpeR
d
ed Signal
efSigPw
The parameter indicates the transmit
0]
Resourc
Power of
r
power every resource element of
step
e
BP
cell-specific reference signals of
0.1
Resourc
servered CP. The unit is dBm.
unit
e
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[-60,5
12
dBm
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ZTE LTE FDD Power Control Feature Guide
DL
paForB
For each UE, the ratio of PDSCH
Power
CCH
EPRE to cell-specific RS EPRE
Cont DL
among PDSCH REs in all the OFDM
Power
symbols not containing cell-specific
Control
RS is equal and is denoted by
rol
Rho_A.The UE may assume that for
16 QAM or 64 QAM or spatial
multiplexing with more than one
layer or for PDSCH transmissions
associated with the multi-user MIMO
transmission scheme Rho_A is
2
Power
equal to Delta_power_offset + P_A +
Offset
10log10(2) [dB] when the UE
Between
receives a PDSCH data
BCCH
transmission using precoding for
and Cell
transmit diversity with 4 cell-specific
RS
antenna ports, and Rho_A is equal
(P_A_BC
to Delta_power_offset + P_A [dB]
CH)
otherwise, where
0:-6,1:
-4.77,
2:-3,3:
-1.77,
0[4]
4:0,5:
1,6:2,
7:3
Delta_power_offset is 0 dB for all
PDSCH transmission schemes
except multi-user MIMO and P_A is
a parameter provided by higher
layers. Not necessarily valid in some
cases, e.g. QPSK with no spatial
multiplexing and without multi-user
MIMO transmission mode. The
parameter is corresponding to the
PDSCH data sourced from BCCH
logical channel.
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DL
paForC
For each UE, the ratio of PDSCH
Power
CCH
EPRE to cell-specific RS EPRE
Control
among PDSCH REs in all the OFDM
symbols not containing cell-specific
RS is equal and is denoted by
Rho_A.The UE may assume that for
16 QAM or 64 QAM or spatial
multiplexing with more than one
layer or for PDSCH transmissions
associated with the multi-user MIMO
transmission scheme Rho_A is
3
Power
equal to Delta_power_offset + P_A +
Offset
10log10(2) [dB] when the UE
Between
receives a PDSCH data
CCCH
transmission using precoding for
and Cell
transmit diversity with 4 cell-specific
RS
antenna ports, and Rho_A is equal
(P_A_CC
to Delta_power_offset + P_A [dB]
CH)
otherwise, where
0:-6,1:
-4.77,
2:-3,3:
-1.77,
0[4]
4:0,5:
1,6:2,
7:3
Delta_power_offset is 0 dB for all
PDSCH transmission schemes
except multi-user MIMO and P_A is
a parameter provided by higher
layers. Not necessarily valid in some
cases, e.g. QPSK with no spatial
multiplexing and without multi-user
MIMO transmission mode. The
parameter is corresponding to the
PDSCH data sourced from CCCH
logical channel.
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DL
paForP
For each UE, the ratio of PDSCH
Power
CCH
EPRE to cell-specific RS EPRE
Control
among PDSCH REs in all the OFDM
symbols not containing cell-specific
RS is equal and is denoted by
Rho_A.The UE may assume that for
16 QAM or 64 QAM or spatial
multiplexing with more than one
layer or for PDSCH transmissions
associated with the multi-user MIMO
transmission scheme Rho_A is
4
Power
equal to Delta_power_offset + P_A +
Offset
10log10(2) [dB] when the UE
Between
receives a PDSCH data
PCCH
transmission using precoding for
and Cell
transmit diversity with 4 cell-specific
RS
antenna ports, and Rho_A is equal
(P_A_PC
to Delta_power_offset + P_A [dB]
CH)
otherwise, where
0:-6,1:
-4.77,
2:-3,3:
-1.77,
0[4]
4:0,5:
1,6:2,
7:3
Delta_power_offset is 0 dB for all
PDSCH transmission schemes
except multi-user MIMO and P_A is
a parameter provided by higher
layers. Not necessarily valid in some
cases, e.g. QPSK with no spatial
multiplexing and without multi-user
MIMO transmission mode. The
parameter is corresponding to the
PDSCH data sourced from PCCH
logical channel.
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DL
paForM
For each UE, the ratio of PDSCH
Power
SG2
EPRE to cell-specific RS EPRE
Control
among PDSCH REs in all the OFDM
symbols not containing cell-specific
RS is equal and is denoted by
Rho_A.The UE may assume that for
16 QAM or 64 QAM or spatial
multiplexing with more than one
layer or for PDSCH transmissions
associated with the multi-user MIMO
Power
Offset
Between
5
MSG2
and Cell
RS
(P_A_M
SG2)
transmission scheme Rho_A is
equal to Delta_power_offset + P_A +
0:-6,1:
10log10(2) [dB] when the UE
-4.77,
receives a PDSCH data
2:-3,3:
transmission using precoding for
-1.77,
transmit diversity with 4 cell-specific
4:0,5:
antenna ports, and Rho_A is equal
1,6:2,
to Delta_power_offset + P_A [dB]
7:3
0[4]
otherwise, where
Delta_power_offset is 0 dB for all
PDSCH transmission schemes
except multi-user MIMO and P_A is
a parameter provided by higher
layers. Not necessarily valid in some
cases, e.g. QPSK with no spatial
multiplexing and without multi-user
MIMO transmission mode. The
parameter is corresponding to the
PDSCH data sourced from Msg2.
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ZTE LTE FDD Power Control Feature Guide
DL
paForD
For each UE, the ratio of PDSCH
Power
CCH
EPRE to cell-specific RS EPRE
Control
among PDSCH REs in all the OFDM
symbols not containing cell-specific
RS is equal and is denoted by
Rho_A.The UE may assume that for
16 QAM or 64 QAM or spatial
multiplexing with more than one
layer or for PDSCH transmissions
associated with the multi-user MIMO
transmission scheme Rho_A is
Power
Offset
Between
6
DCCH
and Cell
RS
(P_A_DC
CH)
equal to Delta_power_offset + P_A +
10log10(2) [dB] when the UE
0:-6,1:
receives a PDSCH data
-4.77,
transmission using precoding for
2:-3,3:
transmit diversity with 4 cell-specific
-1.77,
antenna ports, and Rho_A is equal
4:0,5:
to Delta_power_offset + P_A [dB]
1,6:2,
otherwise, where
7:3
0[4]
Delta_power_offset is 0 dB for all
PDSCH transmission schemes
except multi-user MIMO and P_A is
a parameter provided by higher
layers. Not necessarily valid in some
cases, e.g. QPSK with no spatial
multiplexing and without multi-user
MIMO transmission mode. The
parameter is corresponding to the
PDSCH data sourced from DCCH
logical channel and its assignment is
through CCCH logical channel.
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DL
paForD
For each UE, the ratio of PDSCH
Power
TCH
EPRE to cell-specific RS EPRE
Control
among PDSCH REs in all the OFDM
symbols not containing cell-specific
RS is equal and is denoted by
Rho_A.The UE may assume that for
16 QAM or 64 QAM or spatial
multiplexing with more than one
layer or for PDSCH transmissions
associated with the multi-user MIMO
transmission scheme Rho_A is
Power
Offset
Between
7
PDSCH
and Cell
RS
(P_A_DT
CH)
equal to Delta_power_offset + P_A +
10log10(2) [dB] when the UE
0:-6,1:
receives a PDSCH data
-4.77,
transmission using precoding for
2:-3,3:
transmit diversity with 4 cell-specific
-1.77,
antenna ports, and Rho_A is equal
4:0,5:
to Delta_power_offset + P_A [dB]
1,6:2,
otherwise, where
7:3
0[4]
Delta_power_offset is 0 dB for all
PDSCH transmission schemes
except multi-user MIMO and P_A is
a parameter provided by higher
layers. Not necessarily valid in some
cases, e.g. QPSK with no spatial
multiplexing and without multi-user
MIMO transmission mode. The
parameter is corresponding to the
PDSCH data sourced from DCCH
logical channel and its assignment is
through CCCH logical channel.
4.7.3
Configuration Description
4.7.3.1
Function Activation
Downlink power allocation is enabled acquiescently. There is no switch to control it.
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ZTE LTE FDD Power Control Feature Guide
4.7.3.2
Configuring Other Relevant Parameters
1.
In the Configuration Management window of the EMS, select Modify Area > Radio
Parameter > LTE FDD >Resource Interface Configuration > Baseband
Resource. Click the
button, configure the Referenced signal power of BP
resource parameter(configuring according to practical test), as shown in Figure 4-28.
Click the
Figure 4-28
2.
button.
configuring the Referenced signal power of BP resource parameter
To test if the Power offset parameters of downlink logical channel can be normally
delivered as configured in the network management system, in the Configuration
Management window of the EMS, select Modify Area > Radio Parameter > LTE
FDD > E-UTRAN FDD Cell > DL Power Control. Click the
the parameter as shown in Figure 4-29. Click the
70
button, configure
button.
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ZTE LTE FDD Power Control Feature Guide
Figure 4-29
4.7.3.3
Configuring the Power offset parameters of downlink logical channel
Function Deactivation
Downlink power allocation is enabled acquiescently. There is no switch to control it.
4.7.3.4
Data Synchronization
Select [Configuration Management->Data Synchronization] from the main menu of
the Configuration Management tab. The Data Synchronization dialog box opens. First
select NE, then select synchronization mode as Incremental synchronization, last click
Synchronize button.
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5
5.1
5.1.1
Feature Validation
PUSCH Open-Loop Power Control
Topology
The topology of PUSCH open-loop power control test is shown in Figure 5-1.
Figure 5-1
Topology of PUSCH Open-Loop Power Control Test
eNB
IP bone
MME / S-GW
PGW
SGW / DHCP Relay
PDN Server
For the
equipment and instruments required in this test, refer to Table 5-1.
Table 5-1
Equipment Requirements of the PUSCH Open-Loop Power Control Test
No.
5.1.2
Device
Remarks
1
eNodeB
One
2
UE
One
3
MME
One
4
PGW
One
5
PDN server
One
Test Specification
For the test specifications, refer to Table 5-2..
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Table 5-2
Test Specifications of PUSCH Open-Loop Power Control
Test item
PUSCH open-loop power control test
Purpose
Verify that the PUSCH open-loop power control feature is normal.
1. Set the parameter Switch for PUSCH Closed-Loop Power
Control to Close [0], the parameter Path loss compensation
factor for PUSCH transmission power to 0.8, and the parameter
Cell nominal power required for data transmission in PUSCH
dynamic scheduling authorization mode to 46. Keep the default
Prerequisites
values for other parameters.
2. The LTE system works properly. The cell is established
successfully.
3. The log tools on the eNodeB side and that on the UE side work
properly.
Step
Expected step result
Place a UE in the center of the
1
serving cell, and initiate an attach
operation.
2
Start uplink service from UE to
PDN server.
The UE accesses the serving cell
successfully.
The traffic is operating properly.
Stop the uplink service, release
3
the UE, and save the logs on the
eNodeB and UE sides.
The PUSCH transmit power on the UE side meets the following
Expected
Result
formula:
PPUSCH (i )  min{PCMAX ,10log10 ( M PUSCH (i ))  PO _ PUSCH ( j )   ( j )  PL  TF (i)  f (i)}[dBm]
The PUSCH transmit power on the UE side meets the formula
Criteria
defined in the protocol.
The traffic is operating properly.
Test result
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Passed
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ZTE LTE FDD Power Control Feature Guide
5.1.3
Test Result
Use a Qualcomm UE to do the test. After saving logs, use the QCAT to check the test
result. Select these logs (0xB0C0 LTE RRC OTA Packet, 0xB16C LTE DCI
Information Report, and 0xB16E LTE PUSCH Power Control) to check the test result.
View P-max information in SIB1, see Figure 5-2.
Figure 5-2
p-max
View the values of p0-NominalPUSCH and alpha from SIB2, see Figure 5-3.
Figure 5-3
SIB2 Contains Uplink Power Control Parameters
View the P0-UE-PUSCH information from the RRC Connection Reconfiguration
message, see Figure 5-4.
Figure 5-4
P0-UE-PUSCH Information
See the number of RBs used in the scheduling of subframes from the PassLTE DCI
Information message, see Figure 5-5.
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Figure 5-5
Number of RBs in the DCI Information
Compare the PUSCH power calculated by using the formula with the parameter in the
log on the UE side, and determine whether the transmit power is normal. For DCI
transmitting in subframe n, the transmit time of PUSCH is n+4 subframe, see Figure 5-6.
Figure 5-6
PUSCH Transmit Power Observed on the UE Side
The following is an example of the calculation:
The UE receives the DCI0 message at system-frame 237, subframe 4, with 30 RBs.
Calculate the PUSCH power based on the following formula:
PPUSCH (i )  min{PCMAX ,10log10 ( M PUSCH (i ))  PO _ PUSCH ( j )   ( j )  PL  TF (i)  f (i)}[dBm]
=
min {23, 10log1030 + (-80+1) + 0.8 * 82} = 1.37
The UE sends PUSCH four subframes after receiving DCI0. Therefore, check the
PUSCH power at frame 237, subframe 8. The actual transmit power is 2, which meets
the calculation result.
Note: The protocol specifies a redundancy of +/- 2dBm between the actual PUSCH
transmit power and the theoretically calculated value.
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5.2
5.2.1
PUSCH Closed-Loop Power Control
Topology
Refer to 5.1.1 Topology.
5.2.2
Test Specification
For the test specifications, refer to Table 5-3.
Table 5-3
Test Specifications of PUSCH Closed-Loop Power Control
Test item
Purpose
PUSCH closed-loop power control test
Verify that the PUSCH closed-loop power control feature is
normal.
1. Set the parameter Switch for PUSCH Closed-Loop Power
Control to Open [1], the parameter Path loss compensation factor
for PUSCH transmission power to 0.8, and the parameter Cell
nominal power required for data transmission in PUSCH dynamic
scheduling authorization mode to 46. Keep the default values for
Prerequisites
other parameters.
2. The LTE system works properly. The cell is established
successfully
3. The log tools on the eNodeB side and that on the UE side work
properly.
Step
Place a UE at the edge of the
1
serving cell, and perform the
attach operation.
2
Start uplink service from UE to
PDN server.
Adjust the path loss to trigger the
3
eNodeB to send different TPC
values.
76
Expected step result
The UE accesses the serving cell
successfully.
The traffic is operating properly.
Compare the logs on the eNodeB side
with those on the UE side. Confirm that
the TPC value received by the UE is the
same as that on the eNodeB side.
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ZTE LTE FDD Power Control Feature Guide
Stop the uplink service, release
4
the UE, and save the logs on the
eNodeB and UE sides.
The PUSCH transmit power on the UE side meets the following
formula:
Expected
PPUSCH (i )  min{PCMAX ,10log10 ( M PUSCH (i ))  PO _ PUSCH ( j )   ( j )  PL  TF (i)  f (i)}[dBm]
Result
The PUSCH transmit power on the UE side meets the formula
defined in the protocol.
Criteria
The traffic is operating properly.
Passed
Test result
5.2.3
Test Result
For parameters related to the PUSCH power, refer to Section 5.1.3 Test Result.
The following are closed-loop PUSCH parameters:
TF (i) compensates the effects of modulation and code rates on the power offset value
PUSCH
) . For
of the uplink physical channel. When Ks = 1.25,  TF (i )  10 log10 ((2 MPR  K S  1)  offset
how to calculated the parameters, refer to the TS36.213 protocol. When Ks = 0,
 TF (i )  0 . Ks is obtained from the deltaMCS-Enable parameter, and is used to
compensate the effects of code rate adjustment on the uplink physical channel. As
shown in Figure 5-4, Ks = 0, and the type of the closed-loop power adjustment is the
absolute type.
Therefore, f(i)=
 PUSCH (i  K PUSCH ) . For FDD, K PUSCH  4 .
The value unit of
 PUSCH
is dB. The value is related to the TPC values in DCI0 and
DCI3/3A. For details, refer to Section 3.2.2 PUSCH Closed-Loop Power Control. When
TPC = 1 in DCI0,
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 PUSCH
is 0.
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ZTE LTE FDD Power Control Feature Guide
After closed-loop power control is enabled, the received DCI0 message is shown in
Figure 5-7.
Figure 5-7
DCI0 Message Received
The PUSCH power corresponding to DCI0 transmission is shown in Figure 5-8.
Figure 5-8
PUSCH Power
Calculate the PUSCH transmit power when the switch for PUSCH closed-loop power
control is turned on based on the above Result.
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PPUSCH (i )  min{PCMAX ,10log10 ( M PUSCH (i ))  PO _ PUSCH ( j )   ( j )  PL  TF (i)  f (i)}[dBm]
=min
{23, 10log10100 + (-80 + 1) + 0.8*81 + 1 } = 6.8
5.3
5.3.1
PUCCH Open-Loop Power Control
Topology
Refer to Section 5.1.1 Topology.
5.3.2
Test Specification
For the test specifications, refer to Table 5-4.
Table 5-4
Test Specifications of PUCCH Open-Loop Power Control
Test item
Purpose
PUCCH open-loop power control test
Verify that the PUCCH open-loop power control feature is
normal.
1. Set the parameter Switch for PUCCH Closed-Loop Power
Control to Close [0], and keep the default values of other
parameters.
Prerequisites
2. The LTE system works properly. The cell is established
successfully
3. The log tools on the eNodeB side and that on the UE side work
properly.
Step
Place a UE in the center of the
1
serving cell, and initiate the
attach operation.
2
Start downlink UDP service from
PDN server to UE.
Expected step result
The UE accesses the serving cell
successfully.
The traffic operation is normal.
Stop the downlink service,
3
release the UE, and save the logs
on the eNodeB and UE sides.
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The PUCCH transmit power on the UE side meets the following
Expected
Result
Criteria
Test result
5.3.3
formula:


PPUCCH i   min PCMAX , P0_PUCCH  PL  h  nCQI , nHARQ   F_PUCCH  F   g i  [dBm]
The PUCCH transmit power on the UE side meets the formula
defined in the protocol.
Passed
Test Result
Select these logs（0xB0C0 LTE RRC OTA Packet and 0xB16F LTE PUCCH Power
Control）. View the information about the PUCCH power.
Figure 5-9 shows PUCCH power parameters in SIB2.
Figure 5-9
PUCCH Power Parameters in SIB2
Figure 5-10 shows PUCCH power parameters in the RRC Connection Reconfiguration
message.
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Figure 5-10
PUCCH Power Parameters in the RRC Connection Reconfiguration
Message
Figure 5-11 shows how to view PUCCH transmit power information from the LTE
PUCCH Power Control message.
Figure 5-11
PUCCH Transmit Power Information
The PUCCH power transmitted on subframe 0 of system frame 875 as shown in the
above figure is calculated by using the following formula:


PPUCCH  i   min PCMAX , P0_PUCCH  PL  h  nCQI , nHARQ   F_PUCCH  F   g i  [dBm]
=
min
{23, (-105 + 1) + 88 + 3 + 17} = 4
Note: There can be a +/- 2 dBm redundancy between the actual and theoretical PUCCH
transmit power.
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As shown in the above figure, the actual PUCCH transmit power is the same as the
theoretically calculated value. The test passes the verification.
5.4
5.4.1
PUCCH Closed-Loop Power Control
Topology
Refer to Section 5.1.1 Topology.
5.4.2
Test Specification
For the test specifications, refer to Table 5-5.
Table 5-5
Test Specifications of PUCCH Closed-Loop Power Control
Test item
Purpose
PUCCH closed-loop power control
Verify that the PUCCH closed-loop power control feature is
normal.
1. Set the parameter Switch for PUCCH Closed-Loop Power
Control to Open [1], and keep the default values of other
parameters.
Prerequisites
2. The LTE system is operating properly. The cell is established
successfully
3. The log tools on the eNodeB side and that on the UE side work
properly.
Step
Place a UE in the edge of the
1
serving cell, and initiate the
attach operation.
2
Start downlink UDP service from
PDN server to UE.
Adjust the PL to trigger the
3
eNodeB to send TPC for
adjusting the UE's transmit
power.
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Expected step result
The UE accesses the serving cell
successfully.
The traffic operation is normal.
Compare the TCP value received on the
eNodeB with that received on the UE
side. Confirm that they are the same.
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Stop the downlink service,
3
release the UE, and save the logs
on the eNodeB and UE sides.
The PUCCH transmit power on the UE side meets the following
formula:
Expected


PPUCCH i   min PCMAX , P0_PUCCH  PL  h  nCQI , nHARQ   F_PUCCH  F   g i  [dBm]
Result
The PUCCH transmit power on the UE side meets the formula
defined in the protocol.
Criteria
The traffic operation is normal.
Passed
Test result
5.4.3
Test Result
The PUCCH power transmitted on subframe 4 of system frame 311 as shown in Figure
5-12 is calculated by using the following formula:
Figure 5-12
Result of PUCCH Closed-Loop Power Control


PPUCCH  i   min PCMAX , P0_PUCCH  PL  h  nCQI , nHARQ   F_PUCCH  F   g i  [dBm]
=min {23,
(-105+1) + 124 + 0 + 0 + (-9)} = 11
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Note: There can be a +/- 2 dBm redundancy between the actual and theoretical PUCCH
transmit power.
As shown in the above figure, the actual PUCCH transmit power is the same as the
theoretically calculated value. The test passes the verification.
5.5
5.5.1
SRS Power Control
Topology
Refer to Section 5.1.1 Topology.
5.5.2
Test Specification
For the test specifications, refer to Table 5-6.
Table 5-6
Test Specifications of SRS Power Control
Test item
Purpose
SRS closed-loop power control
To verify that the SRS closed-loop power control feature is
normal.
1. Set the parameter Switch for PUSCH Closed-Loop Power
Control to Open [1] and the parameter Switch of SRS
Configuration to Open [1]. Keep the default values of other
parameters.
Prerequisites
2. The LTE system works properly. The cell is established
successfully
3. The log tools on the eNodeB side and that on the UE side work
properly.
Step
Place a UE on the edge of the
1
serving cell, and initiate the
attach operation.
2
84
Start uplink service from UE to
PDN server.
Expected step result
The UE accesses the serving cell
successfully.
The traffic operation is normal.
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Adjust the path loss to trigger the
3
eNodeB to send different TPC
values.
Compare the logs on the eNodeB side
with those on the UE side. Confirm that
the TPC value received by the UE is the
same as that received by the eNodeB.
Stop the uplink service, release
4
the UE, and save the logs on the
eNodeB and UE sides.
The SRS transmit power on the UE side meets the following
Expected
formula:
PSRS (i )  min{PCMAX , PSRS _ OFFSET  10log10 ( M SRS )  PO _ PUSCH ( j )   ( j )  PL  f (i)}[ dBm]
Result
The SRS transmit power on the UE side meets the formula
defined in the protocol.
Criteria
The traffic operation is normal.
Test result
5.5.3
Passed
Test Result
Select the log (0xB171 LTE SRS Power Control Report) to view SRS power information.
Figure 5-13 shows SRS power information in SIB2.
Figure 5-13
SRS Power Parameters in SIB2
The SRS and PUSCH parameters in RRC Connection Reconfiguration message are
shown in Figure 5-14.
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Figure 5-14
Re-configured SRS and PUSCH Parameters
The SRS power transmitted on subframe 0 of system frame 330 as shown in Figure 5-15
is calculated as follows:
Figure 5-15
SRS Power Result
PSRS (i )  min{PCMAX , PSRS _ OFFSET  10log10 ( M SRS )  PO _ PUSCH ( j )   ( j )  PL  f (i)}[ dBm]
= min{23, (-3) + 10log1024 + (-80 + 1) + 0.8 * 113 + (-4)}=18.202
Note:
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There can be a +/- 2 dBm redundancy between the actual and theoretical transmit power.
As shown in the above figure, the actual transmit power is the same as the theoretically
calculated value. The test passes the verification.
5.6
5.6.1
PRACH Open-Loop Power Control
Topology
Refer to Section 5.1.1 Topology.
5.6.2
Test Specification
For the test specifications, refer to Table 5-7.
Table 5-7
Test Specifications of PRACH Power Control
Test item
PRACH open-loop power control test
Purpose
Verify that the PRACH open-loop power control feature is normal.
1. The LTE system works properly. The cell is established
Prerequisites
successfully
2. The log tools on the eNodeB side and that on the UE side work
properly.
Step
Expected step result
Place a UE on the edge of the
1
serving cell, and initiate the
attach operation.
2
The UE accesses the serving cell
successfully.
Save the logs on the eNodeB and
UE sides.
The PRACH transmit power on the UE side meets the following
Expected
Result
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formula:
PPRACH  minPCMAX，PL  PO_PRE   PREAMBLE_Msg 3  Prampup dBm
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The PRACH transmit power on the UE side meets the formula
defined in the protocol.
Criteria
Test result
5.6.3
Passed
Test Result
View the broadcast initial target power and power ramping step received by the UE in
SIB2, as shown in Figure 5-16.
Figure 5-16
PRACH Power Parameters in SIB2
View the number of MSG1 transmission times, as shown in Figure 5-17.
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Figure 5-17
Number of MSG1 Transmission Times
View the current path loss value in LTE PUSCH Power Control, as shown in Figure
5-18.
Figure 5-18
Path Loss Shown in the LTE PUSCH Control Log
View the preamble format and PRACH transmit power in MSG1, as shown in Figure
5-19,
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Figure 5-19
Preamble Format and PRACH transmit Power Shown in MSG1
Formula:
PPRACH  minPCMAX，PL  PO_PRE   PREAMBLE_Msg 3  Prampup dBm
= min {22, 126 + (-100) + 0} = 22
= min {22, 26} = 22
Note: There can be a +/- 2 dBm redundancy between the actual and theoretical transmit
power.
As shown in the above figure, the actual transmit power is the same as the theoretically
calculated value. The test passes the verification.
5.7
5.7.1
Downlink Power Allocation
Topology
Refer to Section 5.1.1 Topology.
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5.7.2
Test Specification
For the test specifications of downlink power allocation, refer to Table 5-8.
Table 5-8
Test Specifications of Downlink Power Allocation
Test item
Downlink power allocation test
Purpose
To verify that the downlink power allocation feature is normal.
1. The LTE system works properly. The cell is established
Prerequisites
successfully
2. The log tools on the eNodeB side and that on the UE side work
properly.
Step
Expected step result
Place a UE on the center of the
1
serving cell, and initiate the
attach operation.
The UE accesses the serving cell
successfully.
Save the logs on the eNodeB and
2
UE sides.
Expected
Result
The downlink power parameters received on the UE side are the
same as those sent on the eNodeB side.
The downlink power parameters received on the UE side are the
Criteria
Test result
5.7.3
same as those sent on the eNodeB side.
Passed
Test Result Check
View the P_A value received by the terminal In the RRC signaling, as shown in Figure
5-20.
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Figure 5-20
P-A Value
Check whether the P_B value and received value of RS are the same on the terminal
side, as shown in Figure 5-21.
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Figure 5-21
6
6.1
P_B Value Being the Same as RS Value
Related Counters, KPI and Alarms
Related Counters
None
6.2
Related KPI
None
6.3
Related Alarms
None
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7
Impact on Network
1.
Impact on Equipment Performance
None.
2.
Impact on Network KPIs
Power control is a basic feature, and it is activated all the time.
Advantages of this feature:

For uplink, power control ensures the service quality and suppresses the
interference to neighbor cells caused by unnecessary power waste.
For downlink, power allocation is to ensure the cell coverage.
8
Abbreviations
For the acronyms and abbreviations, see LTE Glossary.
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