Application Note

Table of contents

1 Preparation .............................................................................................. 2

2 Create Signals ........................................................................................... 3

3 Measure TDD FR1 downlink signal ................................................................ 9

4 Measure TDD FR1 uplink signal .................................................................. 11

5 Trouble Shooting ..................................................................................... 13

6 Reference document ................................................................................ 14

5G NR TDD Signal Generation and

Measurement

Simple demo with Signal Analyzer and Vector Signal Generator Signal Analyzer MS2850A

Vector Signal Generator MG3710E

2

1 Preparation

This document describes operation procedure to generate a 5G NR (New Radio) TDD (Time Division Duplex)

radio signal with a vector signal generator, then analyze and display its characteristics with a signal analyzer.

This demo uses devices shown in the table below.

Model name Model number Necessary options, software, license, etc.

Vector Signal

Generator

MG3710E MG3710E-036 1stRF 100 kHz to 6 GHz

MX370113A 5G NR TDD sub-6 GHz IQproducer

(Firmware Package 6.00.00 or later)

IQproducerTM

signal generation software (V17.01 or later)

Signal Analyzer MS2850A MS2850A-046 44.5 GHz Signal Analyzer

MS2850A-034 Analysis Bandwidth Extension to 1 GHz

MX285051A 5G Standard Measurement Software

(Base License)

MX285051A-011 NR TDD sub-6 GHz Downlink

MX285051A-061 NR TDD sub-6 GHz Uplink

(Firmware Package 17.02.00 or later)

RF cable - One N connector cable

One N-SMA (K) connector converter

Connect the devices as shown in the figure below.

Connect the RF1 Output connector (N / female) of Vector Signal Generator MG3710E and the RF connector (K /

female) of Signal Analyzer MS2850A via a converter.

The operations described in this document do not include general operations such as cable attenuation

setting and calibration, software installation and startup. Please refer to the instruction manual of each device

or software for the detailed explanation of the device to be used.

RF1 Output

Adapter

K-J to N-J

RF Input MG3710E MS2830A

3

2 Create Signals

Signal generating software IQproducer and 5G NR TDD IQproducer

IQproducer MX3701xxA series, PC software, can define and create waveform patterns that imitate the

modulation signal compliance with various wireless systems and transfer it to the vector signal generator. The

Vector Signal Generator MG3710E is preinstalled at the factory.

5G NR TDD sub-6 GHz IQproducer MX370113A is a software / license for generating waveform patterns

conforming to the 5G NR FR1 specification defined in 3GPP TS 38.211, TS 38.212, TS 38.213. You can generate

downlink Test Model waveform patterns used in 5G NR base station transmission tests and uplink FRC (Fixed

Reference Channel) waveform patterns used in reception tests. Parameter settings defined in 3GPPTS 38.141-1

(V15.0.0 2018.12) can be performed simply by specifying test conditions from the “Easy Setup menu”.

The table below shows the 5G NR signals generated and measured in this demo.

① TDD / FR1 (<6 GHz) / downlink / Test Model 3.1

This signal is a waveform generally used for measuring the modulation accuracy of a base station.

As an example, this document uses the waveform pattern name “dl_tm31”.

② TDD / FR1 (<6 GHz) / uplink

This signal is a simple PUSCH analysis waveform configured for this demonstration.

As an example, this document uses the waveform pattern name “ul_scs30k_bw100m”.

Waveform pattern generation with IQproducer

Create a waveform pattern using IQproducer installed in MG3710E. The following is the operating procedure

for the MG3710E vector signal generator.

① TDD / FR1 (<6 GHz) / downlink / Test Model 3.1 signal generation

<Procedure>

1. Press the [IQpro] key on MG3710E to start IQproducer.

2. Press the "5G NR TDD sub-6 GHz" button on the System (Cellular) tab to start 5GNR TDD sub-6 GHz

IQproducer.

IQproducer menu

4

3. Open "5GNRIQPro_Initial" from "Recall Parameter File" in the File menu.

4. From the menu "Easy Setup", select "BTS Test" "Test Model" "NR-FR1-TM3.1" "30 kHz" "BW =

100 MHz".

5. Confirm that the value of “Phase Compensation” in the “Common” tree in the screen is “On” and

“Frequency” is “3750 MHz”.

Display after selecting TM3.1 from Easy Setup

6. Press the Calculation button.

7. Enter "NR_TDD_DEMO" for the package name (Package) and "dl_tm31" for the pattern name (Export File

Name), and click the "OK" button. Waveform generation ends according to the screen.

5

② TDD / FR1 (<6 GHz) / Uplink signal generation

<Procedure>

1. Press the [IQpro] key on MG3710E to start IQproducer.

2. Press the "5G NR TDD sub-6 GHz" button on the System (Cellular) tab to start 5GNR TDD sub-6 GHz

IQproducer.

3. Open "5GNRIQPro_Initial" from "Recall Parameter File" in the File menu.

4. Select "Uplink" as the "Downlink / Uplink" value in the "Common" tree in the screen.

5. Similarly, set the values in the Common tree as follows:

Cell ID = 0

Bandwidth = 100 MHz

Multiplexing Scheme = CP-OFDM

Subcarrier Spacing = 30 kHz

Phase Compensation = On

Carrier Frequency = 3750 MHz

Common parameter Uplink setting example

6

6. Select "Slot # 0" under "Common" and "Uplink" from the tree in the screen, and set each value as follows.

Data Status = Enable

Number of PUSCHs = 1

Common parameter Uplink Slot # 0 setting example

7

7. Select "PUSCH # 0" under "Common" "Uplink" "Slot # 0" from the tree in the screen, and set each value as

follows.

Data Status = Enable

Power Boosting = 0.000 dB

Antenna Port Number = 0

nRTI = 0

nID = 0

Modulation Scheme = QPSK

PUSCH Mapping Type = A

RB Start = 0

Number of RBs = 273

Symbol Length = 14

Common parameter Uplink PUSCH # 0 setting example

8. Select “DMRS” under “Common”, “Uplink”, “Slot # 0” and “PUSCH # 0” from the tree in the screen, and set

each value as follows.

nSCID = 0

DMRS nSCID Data Type = Cell ID

DMRS Additional Position = 0

DMRS Configuration Type = 1

Number of DMRS CDM groups without Data = 1

DMRS TypeA Position = 3

DMRS Power Boosting = 0.000 dB

9. Select "Slot # 0" under "Common" and "Uplink" from the tree in the screen, right click and press the

"Copy" menu. Then right click and press the "Past All" menu. This applies the same configuration to all 20

slots.

10. Press the Calculation button.

11. Enter "NR_TDD_DEMO" for the package name (Package) and "ul_scs30k_bw100m" for the pattern name

(Export File Name), and click the "OK" button. Waveform generation ends according to the screen.

8

Saving and reading configuration files

The waveform pattern settings created with IQproducer can be saved as a file (XML format). To save the

setting file, select “Save Parameter File” from the “File” menu of IQproducer, enter the file name, and then click

the Save button. To read the setting file, select “Recall Parameter File” from the “File” menu of IQproducer,

enter the file name, and then click the Open button.

Waveform selection and signal output with MG3710E

The created 5G NR TDD signal is output from the MG3710E vector signal generator. The operation procedure

is as follows.

<Procedure>

1. Execute [Preset] [F3] Preset All.

2. Press [Load] to display the Waveform List to Load window.

3. Select the package name to be used ("NR_TDD_DEMO" in this case) from the "Packages" list on the left

side of the screen.

4. Select the waveform pattern name to be used from the “Pattern in Package” list on the right side of the

screen.

5. Execute [F6] Load Pattern.

6. Press [Select] to display the Waveform List to Play window.

7. Select the package name ("NR_TDD_DEMO" in this case) from the "Packages" list on the left side of the

screen.

8. Select the waveform pattern name to be used from the “Pattern in Package” list on the right side of the

screen.

9. Execute [F6] Select.

10. Press [Frequency] to set the frequency.

11. Press [Level] to set the level.

12. Press [Mod On / Off] and [On / Off] of RF Output to output the modulation signal.

9

3 Measure TDD FR1 downlink signal

Measure the TDD / FR1 (<6 GHz) / downlink signal generated and output in Chapter 2 with the Signal Analyzer

MS2850A. In this demo, set the vector signal generator MG3710E as follows.

<Setting of MG3710E>

Frequency = 3.75 GHz (Match with the value specified in Phase Compensation)

Output Level = -10 dBm

Waveform pattern = "Dl_tm31" in the "NR_TDD_DEMO" package

<MS2850A procedure>

1. Press [Application Switch] and select “5G Measurement”.

2. Execute [Preset] [F1] Preset.

3. Select [F3] Standard [F3] NR TDD sub-6 GHz Downlink.

4. Press [Frequency] and set the Carrier Frequency to 3.75 GHz (same value as the vector signal generator).

5. Press [Amplitude] and set Input Level to -10 dBm.

6. Press [Measure] [F1] Modulation Analysis [F2] Basic Settings.

7. Set “Test Model” in the Frame Parameter tab in the Basic Settings window to “NR-FR1-TM3.1”.

8. Press [Single] to start measurement.

By the above operations, the frequency error and transmission power of the input signal and the EVM of each

physical channel / signal can be measured.

Press the [Trace] key and press [F1] Trace Mode to switch the graph at the bottom of the screen and visually

capture the characteristics of the input signal. The Summary trace displays a list of EVM and average power for

each physical channel, allowing you to quickly find measurement problems.

5G NR TDD downlink measurement example (EVM vs. Subcarrier trace)

10

Measurement example of 5G NR TDD downlink (Summary trace)

11

4 Measure TDD FR1 uplink signal

Measure the TDD / FR1 (<6 GHz) / uplink signal generated and output in Chapter 2 using the Signal Analyzer

MS2850A. In this measurement demonstration, set the vector signal generator MG3710E as follows.

Frequency = 3.75 GHz (Match with the value specified in Phase Compensation)

Output Level = -10 dBm

Waveform pattern = “Ul_scs30k_bw100m” in the “NR_TDD_DEMO” package

<Procedure>

1. Press [Application Switch] and select “5G Measurement”.

2. Executes [Preset] [F1] Preset.

3. Select [F3] Standard [F5] NR TDD sub-6 GHz Uplink.

4. Press [Frequency] and set the Carrier Frequency to 3.75 GHz (same value as the vector signal generator).

5. Press [Amplitude] and set Input Level to -10 dBm.

6. Press [Measure] [F1] Modulation Analysis [F2] Basic Settings.

7. Press [F1] Frame Parameter and check that the parameter in the tab matches the input signal.

Subcarrier Spacing = 30 kHz

Number of RBs = 273

Cell ID = 0

Phase Compensation = On

8. Press [F2] PUSCH / DM-RS and check that the parameters in the tab match the input signal.

Antenna Port = 1000 (Antenna Port Number = 0)

Modulation Scheme = Auto or QPSK

PUSCH Mapping Type = A

Number of Symbol (Symbol Length) = 14

DM-RS typeA-pos (DMRS TypeA Position) = 3

DM-RS config-type (DMRS Configuration Type) = 1

DM-RS add-pos (DMRS Additional Position) = 0

CDM Group Without Data (Number of DMRS CDM groups without Data) = 1

9. Press [Copy to All Slot] in the [F2] PUSCH / DM-RS tab.

10. Press [F7] Set to close the Basic Settings menu.

11. Press [Single] to start measurement.

With the above operation, the frequency error and transmission power of the input signal, and the EVM for the

physical channel PUSCH and its DM-RS can be measured.

12

5G NR TDD uplink measurement example (EVM vs. Subcarrier trace)

Measurement example of 5G NR TDD uplink (Summary trace)

13

5 Trouble Shooting

The 5G NR radio characteristics test method is similar to LTE, but 5G NR is much more sophisticated than LTE

and has many options for physical signals. If the measurement is not successful, check the basic RF parameters

and the status of the equipment, and then carefully check that the status of the object to be measured and the

conditions of the measurement signal match the instrument settings. Please. Here are general checkpoints for

problems related to measurement.

Mismatch with measurement software setting / input signal

Parameters that need attention:

Combination of Number of RBs and Subcarrier Spacing (Channel Bandwidth is determined), or

Combination of Channel Bandwidth and Subcarrier Spacing (Number of RBs is determined)

Cell ID

Phase Compensation (Modulation accuracy cannot be measured at frequencies other than those

specified at the time of waveform generation)

Product constraints / not measurable signal

Refer to Appendix B “Measurable Signals” in the MX285051A-xx NR TDD Downlink / Uplink Measurement

Software Operation Manual (W3963AE).

Basic signal generator settings: Frequency, level, modulation status, output status, waveform memory /

waveform pattern selection, etc.

Basic signal analyzer settings: Application selection, CAL not executed, frequency, level, span, etc.

If the modulation accuracy measurement using measurement software fails and valid information is not

displayed on the screen, check the waveform using a signal analyzer or spectrum analyzer.

Spectrum observation example of 5G NR TDD uplink signal using signal analyzer function

General setup issues: Bad cable connection, insufficient warm-up of equipment, incorrect correction value

setting, etc.

Measurement equipment options and software shortages required for measurement, firmware version

problems, etc.

Other: Hardware equipment failure, software failure, etc.

14

Record necessary information for troubleshooting and inquiries

Record and save the following data along with the expected results and actual differences, problem

reproduction procedure, model number / serial number of the measuring instrument used, description of the

measurement system and operating environment at that time This is useful for reproducing problems and

making inquiries. For how to save each data, please refer to the operation manual of your product.

Screen copy of the measuring instrument (image data recording the symptoms of the problem)

Parameter setting file (data that stores the setting values of the measuring instrument)

Digitized data file (I / Q data of radio signal captured by Signal Analyzer)

6 Reference document

The following documents can be downloaded from the Anritsu Corporation website.

[Operation manual]

W3920AE MS2850A Signal Analyzer Operation Manual Mainframe Operation

W3963AE MX285051A-011 NR TDD Downlink Measurement Software Operation Manual

Same as above MX285051A-061 NR TDD Uplink Measurement Software Operation Manual

W3580AE MG3710A / MG3710E Vector Signal Generator Operation Manual

W3984AE MX370113A / MX269913A 5G NR TDD sub-6GHz IQproducer ™ Operation Manual

[Application note]

MS2850A_5GNR-E-F-1 5G NR sub-6 GHz Measurement Methods

MS2850A-J-F-1 Dynamic Range Optimization Method for Obtaining Accurate EVM Values

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