Rohde&Schwarz R&S®FPS-K118 V5G Downlink Measurements User Manual
R&S®FPS-K118
Verizon 5GTF Measurement
Application (Downlink)
User Manual
(;ÜÍQ2)
1178.6333.02 ─ 01
User Manual
This manual applies to the following R&S®FPS models with firmware version 1.50 and higher:
●
R&S®FPS4 (1319.2008K04)
●
R&S®FPS7 (1319.2008K07)
●
R&S®FPS13 (1319.2008K13)
●
R&S®FPS30 (1319.2008K30)
●
R&S®FPS40 (1319.2008K40)
The following firmware options are described:
●
R&S®FPS-K118 Verizon 5GTF Downlink Measurement Application (1321.4962.02)
© 2017 Rohde & Schwarz GmbH & Co. KG
Mühldorfstr. 15, 81671 München, Germany
Phone: +49 89 41 29 - 0
Fax: +49 89 41 29 12 164
Email: info@rohde-schwarz.com
Internet: www.rohde-schwarz.com
Subject to change – Data without tolerance limits is not binding.
R&S® is a registered trademark of Rohde & Schwarz GmbH & Co. KG.
Trade names are trademarks of their owners.
Throughout this manual, products from Rohde & Schwarz are indicated without the ® symbol , e.g. R&S®FPS is indicated as
R&S FPS.
R&S®FPS-K118
1 Preface.................................................................................................... 7
1.1 About this Manual......................................................................................................... 7
1.2 Typographical Conventions.........................................................................................7
2 Welcome to the V5GTF Measurement Application............................. 8
2.1 Installation..................................................................................................................... 8
2.2 Starting the V5GTF Measurement Application...........................................................8
2.3 Understanding the Display Information......................................................................9
3 Measurements and Result Displays...................................................12
3.1 Selecting Result Displays.......................................................................................... 12
3.2 Performing Measurements.........................................................................................13
Contents
Contents
3.3 Selecting the Operating Mode................................................................................... 13
3.4 I/Q Measurements....................................................................................................... 14
4 Configuration........................................................................................23
4.1 Configuration Overview..............................................................................................23
4.2 Physical Signal Characteristics.................................................................................25
4.3 Radio Frame Configuration........................................................................................29
4.4 xPDSCH Configuration (Downlink)............................................................................35
4.4.1 xPDSCH Configuration Table....................................................................................... 37
4.4.2 Enhanced Settings for xPDSCH Allocations................................................................. 38
4.5 Synchronization Signal Configuration (Downlink)...................................................41
4.6 Reference Signal Configuration (Downlink)............................................................. 42
4.7 Control Channel Configuration (Downlink).............................................................. 45
4.8 Antenna Port Mapping (Downlink).............................................................................46
4.9 Selecting the Input Source.........................................................................................48
4.9.1 RF Input........................................................................................................................ 48
4.10 Defining the Frequency.............................................................................................. 49
4.11 Defining Level Characteristics...................................................................................49
4.12 Configuring the Data Capture.................................................................................... 52
4.13 Triggering Measurements.......................................................................................... 53
4.14 Tracking....................................................................................................................... 54
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4.15 Demodulation.............................................................................................................. 54
4.16 Automatic Configuration............................................................................................ 55
5 Analysis................................................................................................ 56
5.1 Configuring Tables / Numerical Results................................................................... 56
5.2 Exporting Measurement Results............................................................................... 56
5.3 Analyzing I/Q Measurements..................................................................................... 57
5.3.1 Scale............................................................................................................................. 57
5.3.2 Result Settings.............................................................................................................. 58
5.3.3 Markers......................................................................................................................... 59
6 Remote Control.................................................................................... 60
6.1 Common Suffixes........................................................................................................60
6.2 Introduction................................................................................................................. 61
Contents
6.2.1 Conventions used in Descriptions.................................................................................61
6.2.2 Long and Short Form.................................................................................................... 62
6.2.3 Numeric Suffixes........................................................................................................... 62
6.2.4 Optional Keywords........................................................................................................ 63
6.2.5 Alternative Keywords.................................................................................................... 63
6.2.6 SCPI Parameters.......................................................................................................... 63
6.3 Remote Commands to Select the V5GTF Application.............................................66
6.4 General Window Commands..................................................................................... 68
6.5 Working with Windows in the Display.......................................................................69
6.6 Performing Measurements.........................................................................................76
6.6.1 Measurements.............................................................................................................. 76
6.6.2 Measurement Sequences............................................................................................. 78
6.7 Remote Commands to Retrieve Trace Data............................................................. 81
6.7.1 Using the TRACe[:DATA] Command............................................................................ 81
6.8 Remote Commands to Retrieve Numeric Results................................................... 88
6.8.1 Result Summary............................................................................................................88
6.8.2 Marker Table................................................................................................................. 93
6.9 Remote Commands to Configure the V5GTF Measurements.................................95
6.9.1 General Configuration................................................................................................... 96
6.9.2 Physical Signal Characteristics..................................................................................... 97
6.9.3 Radio Frame Configuration......................................................................................... 101
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6.9.4 xPDSCH Configuration............................................................................................... 106
6.9.5 Synchronization Signal Configuration......................................................................... 118
6.9.6 Reference Signal Configuration.................................................................................. 119
6.9.7 Control Channel Configuration....................................................................................122
6.9.8 Antenna Port Configuration.........................................................................................126
6.9.9 Input Configuration......................................................................................................131
6.9.10 Frequency Configuration.............................................................................................132
6.9.11 Amplitude Characteristics........................................................................................... 133
6.9.12 Data Capture...............................................................................................................137
6.9.13 Tracking...................................................................................................................... 138
6.9.14 Demodulation.............................................................................................................. 139
6.9.15 Automatic Configuration..............................................................................................139
6.10 Analysis..................................................................................................................... 140
Contents
6.10.1 Y-Axis Scale................................................................................................................140
6.10.2 Result Settings............................................................................................................ 141
List of Commands..............................................................................144
Index....................................................................................................147
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Contents
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1 Preface
Preface
Typographical Conventions
1.1 About this Manual
This V5GTF User Manual provides all the information specific to the application. All
general instrument functions and settings common to all applications and operating
modes are described in the main R&S FPS User Manual.
The main focus in this manual is on the V5GTF measurement results and the tasks
required to obtain them. The following topics are included:
●
Welcome to the V5GTF application
Introduction to and getting familiar with the application
●
Measurements and result displays
Details on supported V5GTF measurements and their result types
●
Configuration and analysis
A concise description of all functions and settings available to configure and analyze V5GTF measurements with their corresponding remote control command
●
Remote commands for V5GTF measurements
Remote commands required to configure and perform V5GTF measurements in a
remote environment, sorted by tasks
(Commands required to set up the environment or to perform common tasks on the
instrument are provided in the main R&S FPS User Manual)
●
List of remote commands
Alpahabetical list of all remote commands described in the manual
●
Index
1.2 Typographical Conventions
The following text markers are used throughout this documentation:
Convention Description
"Graphical user interface elements"
KEYS Key names are written in capital letters.
File names, commands,
program code
Input Input to be entered by the user is displayed in italics.
Links Links that you can click are displayed in blue font.
"References" References to other parts of the documentation are enclosed by quota-
All names of graphical user interface elements on the screen, such as
dialog boxes, menus, options, buttons, and softkeys are enclosed by
quotation marks.
File names, commands, coding samples and screen output are distinguished by their font.
tion marks.
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2 Welcome to the V5GTF Measurement
Welcome to the V5GTF Measurement Application
Starting the V5GTF Measurement Application
Application
The R&S FPS-K118 is a firmware application that adds functionality to measure signals according to the Verizon 5G technical forum (TS V5G.211 standard) on the downlink to the R&S FPS.
Bandwidth of V5GTF signals
V5GTF signals have a bandwidth of 100 MHz.
Therefore, measuring these signals requires an R&S FPS with the optional bandwidth
extension (160 MHz).
This user manual contains a description of the functionality that the application provides, including remote control operation. Functions that are not discussed in this manual are the same as in the Spectrum application and are described in the R&S FPS
user manual. The latest versions of the manuals are available for download at the
product homepage.
http://www.rohde-schwarz.com/product/fps.html
● Installation.................................................................................................................8
● Starting the V5GTF Measurement Application..........................................................8
● Understanding the Display Information.....................................................................9
2.1 Installation
2.2 Starting the V5GTF Measurement Application
Find detailed installation instructions in the getting started or the release notes of the
R&S FPS.
The V5GTF measurement application adds a new application to the R&S FPS.
Manual operation via an external monitor and mouse
Although the R&S FPS does not have a built-in display, it is possible to operate it interactively in manual mode using a graphical user interface with an external monitor and
a mouse connected.
It is recommended that you use the manual mode initially to get familiar with the instrument and its functions before using it in pure remote mode. Thus, this document
describes in detail how to operate the instrument manually using an external monitor
and mouse. The remote commands are described in the second part of the document.
For details on manual operation, see the R&S FPS Getting Started manual.
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Welcome to the V5GTF Measurement Application
Understanding the Display Information
To activate the application
1. Press the MODE key on the front panel of the R&S FPS.
A dialog box opens that contains all operating modes and applications currently
available on your R&S FPS.
2. Select the "V5GTF" item.
The R&S FPS opens a new measurement channel for the V5GTF measurement
application.
The measurement is started immediately with the default settings. It can be configured
in the "Overview" dialog box, which is displayed when you select the "Overview" softkey from any menu.
2.3 Understanding the Display Information
The following figure shows a measurement diagram during analyzer operation. All different information areas are labeled. They are explained in more detail in the following
sections.
1 2 3 5 6 7
4
= Toolbar
1
2 = Channel bar
3 = Diagram header
4 = Result display
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Welcome to the V5GTF Measurement Application
Understanding the Display Information
5 = Subwindows (if more than one component carrier is displayed at the same time)
6 = Status bar
7 = Softkeys
MSRA operating mode
In MSRA operating mode, additional tabs and elements are available. A colored background of the screen behind the measurement channel tabs indicates that you are in
MSRA operating mode. Frequency sweep measurements are not available in MSRA
operating mode.
For details on the MSRA operating mode, see the R&S FPS MSRA user manual.
Channel bar information
In the V5GTF measurement application, the R&S FPS shows the following settings:
Table 2-1: Information displayed in the channel bar in the V5GTF measurement application
Ref Level Reference level
Att Mechanical and electronic RF attenuation
Freq Frequency
Mode V5GTF mode (link direction and duplexing)
Capture Time Signal length that has been captured
Frame Count Number of frames that have been captured
Selected Subframe Subframe considered in the signal analysis
Consecutive CC Meas Number of component carriers that are measured; the numbers in paren-
theses indicate the number of component carriers that are analyzed in a
single capture
Example: 8 (3 / 3 / 2) means that 8 component carriers are analyzed in
three consecutive data captures. The first two data captures analyze the
first 6 component carriers (3 CCs each), while the last data capture analyzes the last 2 component carriers.
The channel bar also displays information on instrument settings that affect the measurement results even though this is not immediately apparent from the display of the
measured values (for example transducer or trigger settings). This information is displayed only when applicable for the current measurement. For details, see the
R&S FPS getting started manual.
Window title bar information
The information in the window title bar depends on the result display.
The "Constellation Diagram", for example, shows the number of points that have been
measured.
Status bar information
Global instrument settings, the instrument status and any irregularities are indicated in
the status bar beneath the diagram. Furthermore, the progress of the current operation
is displayed in the status bar.
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Welcome to the V5GTF Measurement Application
Understanding the Display Information
Regarding the synchronization state, the application shows the following labels.
●
"Sync OK"
The synchronization was successful. The status bar is green.
●
"Sync Failed"
The synchronization was not successful. The status bar is red.
If you are measuring several component carriers, the message also indicates
which component carrier could not be synchronized.
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3 Measurements and Result Displays
Measurements and Result Displays
Selecting Result Displays
The V5GTF measurement application measures and analyzes various aspects of a
V5GTF signal.
It features several result displays. Result displays are different representations of the
measurement results. They are either diagrams that show the results as a graph or
tables that show the results as numbers.
Remote command:
Result display selection: LAYout:ADD[:WINDow]? on page 70
● Selecting Result Displays........................................................................................12
● Performing Measurements......................................................................................13
● Selecting the Operating Mode.................................................................................13
● I/Q Measurements...................................................................................................14
3.1 Selecting Result Displays
►
Select the icon in the toolbar or press the "Display Config" softkey in the "Measurement" menu.
The application enters the SmartGrid configuration mode.
For more information on the SmartGrid functionality, see the R&S FPS Getting
Started.
In the default state of the application, it shows several conventional result displays.
●
Capture Buffer
●
EVM vs Carrier
●
Power Spectrum
●
Result Summary
●
Alloc ID vs Symbol x Carrier
●
Constellation Diagram
From that predefined state, add and remove result displays as you like from the evaluation bar.
Remote command:
LAYout:ADD[:WINDow]? on page 70
Note that you can customize the contents of some numerical result displays. For more
information, see Chapter 5.1, "Configuring Tables / Numerical Results", on page 56.
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Measurements and Result Displays
Selecting the Operating Mode
3.2 Performing Measurements
By default, the application measures the signal continuously. In "Continuous Sweep"
mode, the R&S FPS captures and analyzes the data again and again.
●
For I/Q measurements, the amount of captured data depends on the capture time.
In "Single Sweep" mode, the R&S FPS stops measuring after it has captured the data
once. The amount of data again depends on the capture time.
You can also repeat a measurement based on the data that has already been captured
with the "Refresh" function. Repeating a measurement with the same data can be useful, for example, if you want to apply different modulation settings to the same I/Q data.
For more information, see the documentation of the R&S FPS.
3.3 Selecting the Operating Mode
Access: MODE > "Multi-Standard Radio Analyzer Tab"
The V5GTF application is supported by the Multi Standard Radio Analyzer (MSRA).
In MSRA operating mode, only the MSRA master actually captures data. The application receives an extract of the captured data for analysis, referred to as the application
data. The application data range is defined by the same settings used to define the
signal capture in "Signal and Spectrum Analyzer" mode. In addition, a capture offset
can be defined, i.e. an offset from the start of the captured data to the start of the
analysis interval.
If a signal contains multiple data channels for multiple standards, separate applications
are used to analyze each data channel. Thus, it is of interest to know which application
is analyzing which data channel. The MSRA master display indicates the data covered
by each application by vertical blue lines labeled with the application name. The blue
lines correspond to the channel bandwidth.
However, the individual result displays of the application need not analyze the complete data range. The data range that is actually analyzed by the individual result display is referred to as the analysis interval.
The analysis interval is automatically determined according to the Capture Time you
have defined. The analysis interval cannot be edited directly in the V5GTF application,
but is changed automatically when you change the evaluation range. The currently
used analysis interval (in seconds, related to capture buffer start) is indicated in the
window header for each result display.
A frequent question when analyzing multi-standard signals is how each data channel is
correlated (in time) to others. Thus, an analysis line has been introduced. The analysis
line is a common time marker for all MSRA slave applications. It can be positioned in
any MSRA slave application or the MSRA Master and is then adjusted in all other slave
applications. Thus, you can easily analyze the results at a specific time in the measurement in all slave applications and determine correlations.
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Measurements and Result Displays
I/Q Measurements
If the marked point in time is contained in the analysis interval of the slave application,
the line is indicated in all time-based result displays, such as time, symbol, slot or bit
diagrams. By default, the analysis line is displayed, however, it can be hidden from
view manually. In all result displays, the "AL" label in the window title bar indicates
whether the analysis line lies within the analysis interval or not:
●
orange "AL": the line lies within the interval
●
white "AL": the line lies within the interval, but is not displayed (hidden)
●
no "AL": the line lies outside the interval
For details on the MSRA operating mode, see the R&S FPS MSRA documentation.
3.4 I/Q Measurements
Access: MEAS > "EVM/Frequency Err/Power"
You can select the result displays from the evaluation bar and arrange them as you like
with the SmartGrid functionality.
Remote command:
Result display selection: LAYout:ADD[:WINDow]? on page 70
Capture Buffer...............................................................................................................14
EVM vs Carrier..............................................................................................................15
EVM vs Symbol.............................................................................................................16
Power Spectrum............................................................................................................16
Spectrum Flatness........................................................................................................ 17
Group Delay..................................................................................................................17
Constellation Diagram...................................................................................................17
Allocation Summary...................................................................................................... 18
EVM vs Symbol x Carrier..............................................................................................19
Power vs Symbol x Carrier............................................................................................19
Allocation ID vs Symbol x Carrier..................................................................................20
Result Summary............................................................................................................20
Marker Table ................................................................................................................22
Capture Buffer
The Capture Buffer result display shows the complete range of captured data for the
last data capture. The x-axis represents time. The maximum value of the x-axis is
equal to the Capture Time. The y-axis represents the amplitude of the captured I/Q
data in dBm (for RF input).
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Measurements and Result Displays
I/Q Measurements
Figure 3-1: Capture buffer without zoom
A green bar at the bottom of the diagram represents the frame that is currently analyzed.
A green vertical line at the beginning of the green bar in the capture buffer represents
the frame start. The diagram also contains the "Start Offset" value. This value is the
time difference between the frame start and capture buffer start.
Remote command:
Selecting the result display: LAY:ADD ? '1',LEFT,CBUF
Querying results: TRACe:DATA?
Querying the subframe start offset: FETCh[:CC<cc>]:SUMMary:TFRame?
on page 93
EVM vs Carrier
Starts the EVM vs Carrier result display.
This result display shows the error vector magnitude (EVM) of the subcarriers. With the
help of a marker, you can use it as a debugging technique to identify any subcarriers
whose EVM is too high.
The results are based on an average EVM that is calculated over the resource elements for each subcarrier. The average subcarrier EVM is calculated over the complete radio frame.
The x-axis represents the center frequencies of the subcarriers. On the y-axis, the
EVM is plotted either in % or in dB, depending on the EVM Unit.
Remote command:
Selecting the result display: LAY:ADD ? '1',LEFT,EVCA
Querying results: TRACe:DATA?
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I/Q Measurements
EVM vs Symbol
Starts the EVM vs Symbol result display.
This result display shows the error vector magnitude (EVM) of the OFDM symbols. You
can use it as a debugging technique to identify any symbols whose EVM is too high.
The results are based on an average EVM that is calculated over all subcarriers that
are part of a certain OFDM symbol. The average OFDM symbol EVM is calculated
over the complete radio frame.
The x-axis represents the OFDM symbols, with each symbol represented by a dot on
the line. Any missing connections from one dot to another mean that the R&S FPS
could not determine the EVM for that symbol.
For TDD signals, the result display does not show OFDM symbols that are not part of
the measured link direction.
On the y-axis, the EVM is plotted either in % or in dB, depending on the EVM Unit.
Remote command:
Selecting the result display: LAY:ADD ? '1',LEFT,EVSY
Querying results: TRACe:DATA?
Power Spectrum
Starts the Power Spectrum result display.
This result display shows the power density of the complete capture buffer in dBm/Hz.
The displayed bandwidth is always 153.6 MHz.
The x-axis represents the frequency. On the y-axis, the power level is plotted.
Remote command:
Selecting the result display: LAY:ADD ? '1',LEFT,PSPE
Querying results: TRACe:DATA?
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I/Q Measurements
Spectrum Flatness
Starts the Spectrum Flatness result display.
This result display shows the relative power offset caused by the transmit channel.
The measurement is evaluated for the complete radio frame.
The x-axis represents the frequency. On the y-axis, the channel flatness is plotted in
dB.
Remote command:
Selecting the result display: LAY:ADD ? '1',LEFT,SFL
Querying results: TRACe:DATA?
Group Delay
Starts the Group Delay result display.
This result display shows the group delay of each subcarrier.
The measurement is evaluated for the complete radio frame.
The x-axis represents the frequency. On the y-axis, the group delay is plotted in ns.
Remote command:
Selecting the result display: LAY:ADD ? '1',LEFT,GDEL
Querying results: TRACe:DATA?
Constellation Diagram
Starts the Constellation Diagram result display.
This result display shows the in-phase and quadrature phase results and is an indica-
tor of the quality of the modulation of the signal.
In the default state, the result display evaluates the full range of the measured input
data.
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I/Q Measurements
The constellation diagram shows the number of points that are displayed in the diagram.
Remote command:
Selecting the result display: LAY:ADD ? '1',LEFT,CONS
Querying results: TRACe:DATA?
Allocation Summary
Starts the Allocation Summary result display.
This result display shows the results of the measured allocations in a table.
The rows in the table represent the allocations, with allocation ALL being a special allocation that summarizes all allocations that are part of the subframe. A set of allocations
form a subframe. The subframes are separated by a dashed line. The columns of the
table contain the following information:
●
Subframe
Shows the subframe number.
●
Allocation ID
Shows the type / ID of the allocation.
●
Number of RB
Shows the number of resource blocks assigned to the corresponding allocation.
●
Rel. Power [dB]
Shows the relative power of the allocation.
●
Modulation
Shows the modulation type.
●
Power per RE [dBm]
Shows the power of each resource element in dBm.
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Measurements and Result Displays
I/Q Measurements
●
EVM
Shows the EVM of the allocation. The unit depends on your selection.
Note: Contents of the allocation summary
The number of columns shown in the allocation summary is variable. To add or remove
a column, click the header row of the table once. The application opens a dialog box to
select the columns which you would like to display.
Remote command:
Selecting the result display: LAY:ADD ? '1',LEFT,ASUM
Querying results: TRACe:DATA?
EVM vs Symbol x Carrier
The EVM vs Symbol x Carrier shows the EVM for each carrier in each symbol.
The horizontal axis represents the symbols. The vertical axis represents the carriers.
Different colors in the diagram area represent the EVM. The color map for the power
levels is provided above the diagram area.
Remote command:
Selecting the result display: LAY:ADD ? '1',LEFT,EVSC
Querying results: TRACe:DATA?
Power vs Symbol x Carrier
The Power vs Symbol x Carrier shows the power for each carrier in each symbol.
The horizontal axis represents the symbols. The vertical axis represents the carriers.
Different colors in the diagram area represent the power. The color map for the power
levels is provided above the diagram area.
Remote command:
Selecting the result display: LAY:ADD ? '1',LEFT,PVSC
Querying results: TRACe:DATA?
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Measurements and Result Displays
I/Q Measurements
Allocation ID vs Symbol x Carrier
The Allocation ID vs. Symbol X Carrier display shows the allocation ID of each carrier
in each symbol of the received signal.
Each type of allocation is represented by a different color. Use a marker to get more
information about the type of allocation.
The map above the diagram also shows the colors used for each allocation.
Remote command:
Selecting the result display: LAY:ADD ? '1',LEFT,AISC
Querying results: TRACe:DATA?
Result Summary
The Result Summary shows all relevant measurement results in numerical form, combined in one table.
Remote command:
LAY:ADD ? '1',LEFT,RSUM
Contents of the result summary
Figure 3-2: Result summary for the downlink
The table shows results that refer to the complete frame. For each result, the mean
values are displayed.
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I/Q Measurements
For measurements on multiple carriers (carrier aggregation), the result summary has a
tab for each carrier. In addition, the "All" tab contains a summary of the results for all
component carriers. Each column of the table represents one component carrier in that
case.
Results for downlink
EVM xPDSCH QPSK Shows the EVM for all QPSK-modulated resource elements of the xPDSCH
channel in the analyzed frame.
FETCh[:CC<cc>]:SUMMary:EVM:DSQP[:AVERage]? on page 89
EVM xPDSCH 16QAM Shows the EVM for all 16QAM-modulated resource elements of the xPDSCH
channel in the analyzed frame.
FETCh[:CC<cc>]:SUMMary:EVM:DSST[:AVERage]? on page 90
EVM xPDSCH 64QAM Shows the EVM for all 64QAM-modulated resource elements of the xPDSCH
channel in the analyzed frame.
FETCh[:CC<cc>]:SUMMary:EVM:DSSF[:AVERage]? on page 89
EVM xPDSCH 256QAM Shows the EVM for all 256QAM-modulated resource elements of the xPDSCH
channel in the analyzed frame.
FETCh[:CC<cc>]:SUMMary:EVM:DSTS[:AVERage]? on page 90
EVM All Shows the EVM for all resource elements in the analyzed frame.
FETCh[:CC<cc>]:SUMMary:EVM[:ALL][:AVERage]? on page 89
EVM Phys Channel Shows the EVM for all physical channel resource elements in the analyzed
frame.
A physical channel corresponds to a set of resource elements carrying infor-
mation from higher layers. xPDSCH, xPUSCH, xPBCH or xPDCCH, for example, are physical channels.
FETCh[:CC<cc>]:SUMMary:EVM:PCHannel[:AVERage]? on page 90
EVM Phys Signal Shows the EVM for all physical signal resource elements in the analyzed
frame.
The reference signal, for example, is a physical signal.
FETCh[:CC<cc>]:SUMMary:EVM:PSIGnal[:AVERage]? on page 91
Frequency Error Shows the difference in the measured center frequency and the reference
center frequency.
FETCh[:CC<cc>]:SUMMary:FERRor[:AVERage]? on page 91
Sampling Error Shows the difference in measured symbol clock and reference symbol clock
relative to the system sampling rate.
FETCh[:CC<cc>]:SUMMary:SERRor[:AVERage]? on page 93
I/Q Offset Shows the power at spectral line 0 normalized to the total transmitted power.
FETCh[:CC<cc>]:SUMMary:IQOFfset[:AVERage]? on page 92
I/Q Gain Imbalance Shows the logarithm of the gain ratio of the Q-channel to the I-channel.
FETCh[:CC<cc>]:SUMMary:GIMBalance[:AVERage]? on page 91
I/Q Quadrature Error Shows the measure of the phase angle between Q-channel and I-channel
deviating from the ideal 90 degrees.
FETCh[:CC<cc>]:SUMMary:QUADerror[:AVERage]? on page 92
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I/Q Measurements
Power Shows the average time domain power of the analyzed signal.
FETCh[:CC<cc>]:SUMMary:POWer[:AVERage]? on page 92
Crest Factor Shows the peak-to-average power ratio of captured signal.
FETCh[:CC<cc>]:SUMMary:CRESt[:AVERage]? on page 88
By default, all EVM results are in %. To view the EVM results in dB, change the EVM
Unit.
Marker Table
Displays a table with the current marker values for the active markers.
Remote command:
LAY:ADD? '1',RIGH, MTAB, see LAYout:ADD[:WINDow]? on page 70
Results:
CALCulate<n>:MARKer<m>:X on page 94
CALCulate<n>:MARKer<m>:Y? on page 95
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4 Configuration
Configuration
Configuration Overview
V5GTF measurements require a special application on the R&S FPS, which you activate using the MODE key on the front panel.
When you start the V5GTF application, the R&S FPS starts to measure the input signal
with the default configuration or the configuration of the last measurement (when you
have not performed a preset since then). After you have started an instance of the V5G
application, the application displays the "Meas Config" menu which contains functions
to define the characteristics of the signal you are measuring.
Unavailable hardkeys
Note that the SPAN, BW, TRACE, LINES and MKR FUNC keys have no contents and
no function in the V5GTF application.
● Configuration Overview...........................................................................................23
● Physical Signal Characteristics...............................................................................25
● Radio Frame Configuration.....................................................................................29
● xPDSCH Configuration (Downlink)......................................................................... 35
● Synchronization Signal Configuration (Downlink)................................................... 41
● Reference Signal Configuration (Downlink)............................................................ 42
● Control Channel Configuration (Downlink)..............................................................45
● Antenna Port Mapping (Downlink).......................................................................... 46
● Selecting the Input Source......................................................................................48
● Defining the Frequency...........................................................................................49
● Defining Level Characteristics.................................................................................49
● Configuring the Data Capture................................................................................. 52
● Triggering Measurements....................................................................................... 53
● Tracking.................................................................................................................. 54
● Demodulation..........................................................................................................54
● Automatic Configuration..........................................................................................55
4.1 Configuration Overview
Throughout the measurement channel configuration, an overview of the most important
currently defined settings is provided in the "Overview". The "Overview" is displayed
when you select the "Overview" menu item from the "Meas Setup" menu.
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Configuration
Configuration Overview
In addition to the main measurement settings, the "Overview" provides quick access to
the main settings dialog boxes. The individual configuration steps are displayed in the
order of the data flow. Thus, you can easily configure an entire measurement channel
from input over processing to output and analysis by stepping through the dialog boxes
as indicated in the "Overview".
In particular, the "Overview" provides quick access to the following configuration dialog
boxes (listed in the recommended order of processing):
1. Signal Description
See Chapter 4.2, "Physical Signal Characteristics", on page 25.
2. Input / Frontend
See Chapter 4.9, "Selecting the Input Source", on page 48.
3. Trigger / Signal Capture
See Chapter 4.13, "Triggering Measurements", on page 53
See Chapter 4.12, "Configuring the Data Capture", on page 52
4. Tracking
See Chapter 4.14, "Tracking", on page 54.
5. Demodulation
See Chapter 4.15, "Demodulation", on page 54.
6. Analysis
See Chapter 5, "Analysis", on page 56.
7. Display Configuration
See Chapter 3, "Measurements and Result Displays", on page 12
In addition, the dialog box provides the "Select Measurement" button that serves as a
shortcut to select the measurement type.
To configure settings
► Select any button in the "Overview" to open the corresponding dialog box.
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Configuration
Physical Signal Characteristics
Select a setting in the channel bar (at the top of the measurement channel tab) to
change a specific setting.
Preset Channel............................................................................................................. 25
Select Measurement..................................................................................................... 25
Specifics for ..................................................................................................................25
Preset Channel
Select the "Preset Channel" button in the lower left-hand corner of the "Overview" to
restore all measurement settings in the current channel to their default values.
Do not confuse the "Preset Channel" button with the PRESET key, which restores the
entire instrument to its default values and thus closes all channels on the R&S FPS
(except for the default channel)!
Remote command:
SYSTem:PRESet:CHANnel[:EXEC] on page 96
Select Measurement
Opens a dialog box to select the type of measurement.
Remote command:
n/a
Specifics for
The channel may contain several windows for different results. Thus, the settings indicated in the "Overview" and configured in the dialog boxes vary depending on the
selected window.
Select an active window from the "Specifics for" selection list that is displayed in the
"Overview" and in all window-specific configuration dialog boxes.
The "Overview" and dialog boxes are updated to indicate the settings for the selected
window.
4.2 Physical Signal Characteristics
Access: "Overview" > "Signal Description" > "Signal Description"
The "Signal Description" dialog box contains general signal characteristics.
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Configuration
Physical Signal Characteristics
Configuring component carriers
When you are doing measurements on aggregated carriers, you can configure each
carrier separately.
When available, each carrier in the dialog boxes is represented by an additional tab
labeled "CC<x>", with <x> indicating the number of the component carrier.
Note that the additional tabs are only added to the user interface after you have
selected more than "1" component carrier.
The remote commands required to configure the physical signal characteristics are
described in Chapter 6.9.2, "Physical Signal Characteristics", on page 97.
The remote commands required to query measurement results are decribed in:
●
Chapter 6.7, "Remote Commands to Retrieve Trace Data", on page 81
●
Chapter 6.8, "Remote Commands to Retrieve Numeric Results", on page 88
Selecting the V5GTF mode...........................................................................................26
Carrier Aggregation.......................................................................................................26
└ Basic component carrier configuration............................................................27
└ Features of the I/Q measurements................................................................. 27
└ Remote commands to configure carrier aggregation......................................28
Physical settings of the signal.......................................................................................28
Using Test Scenarios....................................................................................................28
Selecting the V5GTF mode
The "Mode" selects the V5GTF link direction you are testing.
FDD and TDD are duplexing methods.
●
FDD mode uses different frequencies for the uplink and the downlink.
●
TDD mode uses the same frequency for the uplink and the downlink.
Note that the V5GTF standard only supports TDD mode.
Downlink (DL) and Uplink (UL) describe the transmission path.
●
Downlink is the transmission path from the base station to the user equipment.
The physical layer mode for the downlink is always OFDM.
●
Uplink is the transmission path from the user equipment to the base station.
The physical layer mode for the uplink is always OFDM.
The application shows the currently selected V5GTF mode (including the bandwidth) in
the channel bar.
Remote command:
Link direction: CONFigure[:V5G]:LDIRection on page 98
Carrier Aggregation
Carrier aggregation has been introduced in the V5GTF standard to increase the bandwidth. In those systems, several carriers can be used to transmit a signal.
You can configure up to 8 component carriers for measurements on contiguous and
non-contiguous intra-band carrier aggregation (the carriers are in the same frequency
band). Each carrier has the same bandwidth of 100 MHz.
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Configuration
Physical Signal Characteristics
The application provides the following capture modes.
●
"Single": Each configured component carrier is captured consecutively by an individual data capture buffer.
●
"Auto": The R&S FPS determines how many component carriers it can capture in a
single measurement
If you select "Auto" mode, the R&S FPS captures as many component carriers as it
can in a single measurement and captures the rest in subsequent measurements. The
maximum number of component carriers it can analyze in a single capture depends on
the available bandwidth (with the optional 500 MHz bandwidth, for example, it can analyze up to 5 carriers in a single capture).
When all required measurements are done, the R&S FPS shows the results for all
component carriers.
Basic component carrier configuration ← Carrier Aggregation
You can define the characteristics of the CCs in the table in the "Carrier Configuration"
panel (in the "Signal Characteristics" dialog box). Depending on the "Number of Component Carriers", the application adjusts the size of the table. Each line corresponds to
a component carrier.
●
The "Center Frequency" defines the carrier frequency of the carriers.
●
Each carrier has a bandwidth of 100 MHz.
●
For all component carriers, the R&S FPS also shows the "Frequency Offset" relative to the center frequency of the first carrier.
If you define a different frequency offset, the application adjusts the center frequency accordingly.
Note that the actual measurement frequency differs from the carrier frequencies: the
application calculates that frequency based on the carrier frequencies. It is somewhere
in between the carrier frequencies.
The R&S FPS shows a preview of the current carrier configuration in a diagram at the
bottom of the dialog.
When the defined carrier configuration is not supported by the application, a corresponding error message is displayed. This can be the case, for example, if the carriers
occupy a bandwidth that is too large.
Features of the I/Q measurements ← Carrier Aggregation
For measurements on component carriers, results are shown for each component carrier separately. The layout of the diagrams is adjusted like this:
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Configuration
Physical Signal Characteristics
●
The first tab ("All") shows the results for all component carriers.
●
The other tabs ("CC <x>") show the results for each component carrier individually.
The application also shows the "Occupied Bandwidth" of the aggregated carriers and
the "Sample Rate" in a read-only field below the carrier configuration.
Remote commands to configure carrier aggregation ← Carrier Aggregation
Remote command:
Number of carriers: CONFigure[:LTE]:NOCC on page 97
Capture mode: CONFigure[:V5G]:CSCapture on page 97
Carrier frequency: [SENSe:]FREQuency:CENTer[:CC<cc>] on page 100
Measurement frequency: SENSe:FREQuency:CENTer?
Offset: [SENSe]:FREQuency:CENTer[:CC<cc>]:OFFSet on page 101
Physical settings of the signal
Physical settings describe the basic structure of the signal you are measuring.
The "Channel Bandwidth" of a V5GTF signal is always 100 MHz with a normal "Cyclic
Prefix".
The physical settings also show the sample rate, FFT size, the occupied bandwidth
and number of occupied subcarriers in the signal.
The dialog box also provides an overview of the current structure of the radio frame as
a comma-separated list. Each character corresponds to a subframe, "S,a,a,a,a", for
example means that the first subframe is a synchronization subframe, and all other
subframes are subframe type a.
Selecting the "Configure" button opens the radio frame configuration tab where you
can customize the radio frame structure according to your needs.
The physical layer cell ID is responsible for synchronization between network and user
equipment. It identifies a particular radio cell in the V5GTF network. The cell ID is a
value between 0 and 503. For automatic detection of the cell ID, turn on the "Auto"
function.
Remote command:
Cell ID (DL): CONFigure[:V5G]:DL[:CC<cc>]:PLC:CID on page 98
Using Test Scenarios
Test scenarios are descriptions of specific V5GTF signals.
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Configuration
Radio Frame Configuration
The "Test Models" dialog box contains functionality to select, manage and create test
models.
●
"User Defined"
The "User Defined" tab contains functionality to manage custom test scenarios.
To create a custom test scenario, describe a signal as required and then save it
with the corresponding button.
Here, you can also restore custom test scenarios and delete ones you do not need
anymore.
Test scenarios for carrier aggregation
When you measure component carriers, you can describe each component carrier
separately and save or restore the scenario for each carrier in the corresponding tab
("CC<x>"). Single carrier scenarios are stored in .allocation files.
For easier handling of multiple carriers, however, you can also store the descriptions of
all carriers in a single file. To do so, configure all component carriers as required and
save the test scenario in "All CCs" tab. Multiple carrier test scenarios are stored
in .ccallocation files. The advantage of this method is, that you do not have to
restore a scenario for each component carrier, but can do so in a single step.
The ccallocation files contain the frequency information of the signal.
Remote command:
Single carrier (save): MMEMory:STORe<n>:DEModsetting[:CC<cc>] on page 100
Multiple carriers (save): MMEMory:STORe<n>:DEModsetting:ALL on page 99
Single carrier (restore): MMEMory:LOAD:DEModsetting[:CC<cc>] on page 99
Multiple carriers (restore): MMEMory:LOAD:DEModsetting:ALL on page 99
4.3 Radio Frame Configuration
Access: "Overview" > "Signal Description" > "Radio Frame Config"
A radio frame in the V5GTF standard has a length of 10 ms (same as in LTE). It consists of 50 subframes, each with a length of 0.2 ms. A subframe contains 14 OFDM
symbols.
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Subframes
Subframes
25
25
Subcarrier
Subcarrier
0
0
1200
1200
0
0
4
4
Special subframes
Special subframes
Data subframes
Data subframes
15
15
Figure 4-1: Radio frame as defined by the V5GTF standard
Configuration
Radio Frame Configuration
29
29
40
40
Each subframe has one of four predefined structures. Two structures are defined for
the downlink (a and b), and two for the uplink (c and d).
Each subframe type contains and transmits control information (xPDCCH or xPUCCH)
as well as the user data (xPDSCH or xPUSCH).
The subframes that carry uplink and downlink information also contain a guard period.
The guard period has the length of one symbol in the transition between uplink and
downlink. You can also include optional reference signals (CSI).
OFDM symbols
OFDM symbols
xPDSCH
xPDCCH
xPDCCH: downlink control information
xPDCCH: downlink control information
xPDSCH: downlink data
xPDSCH: downlink data
Figure 4-2: Subframe type a (downlink)
xPDCCH xPDSCH
xPDCCH: downlink control information
xPDCCH: downlink control information
xPDSCH: downlink data
xPDSCH: downlink data
GP: guard period
GP: guard period
xPUCCH: uplink control information
xPUCCH: uplink control information
OFDM symbols
OFDM symbols
xPDSCHxPDSCHxPDSCHxPDSCHxPDSCHxPDSCHxPDSCHxPDSCHxPDSCHxPDSCHxPDSCHxPDSCH
xPUCCHGPxPDSCHxPDSCHxPDSCHxPDSCHxPDSCHxPDSCHxPDSCHxPDSCHxPDSCHxPDSCH
Figure 4-3: Subframe type b (downlink)
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