R&S CMW-KM5 Series User manual

R&S®CMW-KM5xx/-KS5xx
LTE UE Firmware Applications
User Manual
User Manual
(;×îL2)
1173.9628.02 ─ 16
Test & Measurement
深圳德标仪器 135-1095-0799

This user manual describes the following R&S®CMW options:
●R&S®CMW-KM500 (LTE FDD R8, TX measurement, uplink)
●R&S®CMW-KM502 (LTE FDD R10 UL CA, TX measurement, uplink)
●R&S®CMW-KM550 (LTE TDD R8, TX measurement, uplink)
●R&S®CMW-KM552 (LTE TDD R10 UL CA, TX measurement, uplink)
●R&S®CMW-KM012 (TX measurement, multi evaluation list mode)
●R&S®CMW-KS500 (LTE FDD R8, SISO, basic signaling)
●R&S®CMW-KS502 (LTE FDD R10, CA, basic signaling)
●R&S®CMW-KS510 (LTE R8, SISO, advanced signaling)
●R&S®CMW-KS512 (LTE R10, CA, advanced signaling)
●R&S®CMW-KS520 (LTE MIMO 2x2, generic signaling)
●R&S®CMW-KS521 (LTE MIMO 4x2, generic signaling)
●R&S®CMW-KS525 (LTE user-defined bands, generic signaling)
●R&S®CMW-KS550 (LTE TDD R8, SISO, basic signaling)
●R&S®CMW-KS552 (LTE TDD R10, CA, basic signaling)
●R&S®CMW-KE100 (Basic fading support: AWGN generator)
●R&S®CMW-KE500 (LTE fading profiles TS 36.521, excerpts)
●R&S®CMW-KE501 (LTE fading profiles MIMO 4x2 from TS 36.521 B2.3)
© 2014 Rohde & Schwarz GmbH & Co. KG
Mühldorfstr. 15, 81671 München, Germany
Phone: [phone] - 0
Fax: [phone]
E-mail: [email protected]
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 the owners.
The following abbreviations are used throughout this manual: R&S®CMW is abbreviated as R&S CMW.
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Contents
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Contents
1Preface.................................................................................................... 9
1.1 How to Read Firmware Application Chapters............................................................ 9
1.1.1 General Description........................................................................................................ 9
1.1.2 Application Sheets........................................................................................................ 10
1.1.3 GUI Reference.............................................................................................................. 10
1.1.4 Programming Examples................................................................................................10
1.1.5 Command Reference.................................................................................................... 10
2LTE Signaling....................................................................................... 11
2.1 What's New in this Revision.......................................................................................11
2.2 General Description.................................................................................................... 12
2.2.1 Test Setups................................................................................................................... 13
2.2.2 Initiating Signaling Tests............................................................................................... 19
2.2.3 Carrier Aggregation.......................................................................................................20
2.2.4 External Fading............................................................................................................. 22
2.2.5 Internal Fading.............................................................................................................. 23
2.2.6 Data Tests and Voice Over LTE................................................................................... 24
2.2.7 Audio Tests and Speech Quality Tests......................................................................... 24
2.2.8 Connection States.........................................................................................................25
2.2.9 Handover.......................................................................................................................28
2.2.10 Physical DL Channels and Signals............................................................................... 30
2.2.11 MIMO and Beamforming............................................................................................... 34
2.2.12 Scheduling Type RMC.................................................................................................. 39
2.2.13 User-Defined Channels.................................................................................................51
2.2.14 CQI Channels................................................................................................................53
2.2.15 Semi-Persistent Scheduling (SPS)............................................................................... 56
2.2.16 Operating Bands........................................................................................................... 57
2.2.17 Trigger Signals.............................................................................................................. 60
2.2.18 Relative Power Control Tests........................................................................................61
2.2.19 Extended BLER Measurement......................................................................................63
2.2.20 RLC Throughput Measurement.....................................................................................73
2.3 Application Sheets......................................................................................................75
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2.3.1 Combined Signal Path Measurements..........................................................................75
2.3.2 LTE IP-Based Data Tests............................................................................................. 79
2.3.3 VoLTE Call Setup and Audio Tests...............................................................................83
2.4 GUI Reference............................................................................................................. 94
2.4.1 Signaling View...............................................................................................................95
2.4.2 Signaling Control.........................................................................................................112
2.4.3 Using the Shortcut Softkeys........................................................................................116
2.4.4 General Settings......................................................................................................... 117
2.4.5 I/Q Settings................................................................................................................. 121
2.4.6 RF Settings................................................................................................................. 123
2.4.7 Internal Fading............................................................................................................ 130
2.4.8 Downlink Power Levels............................................................................................... 135
2.4.9 Uplink Power Control.................................................................................................. 138
2.4.10 Physical Cell Setup..................................................................................................... 143
2.4.11 Network Settings......................................................................................................... 149
2.4.12 Connection Configuration............................................................................................160
2.4.13 CQI Reporting............................................................................................................. 184
2.4.14 UE Measurement Report Settings.............................................................................. 186
2.4.15 Messaging (SMS) Parameters.................................................................................... 188
2.4.16 Shortcut Configuration................................................................................................ 191
2.4.17 Message Monitoring Settings......................................................................................191
2.4.18 BLER Measurement Configuration............................................................................. 192
2.4.19 RLC Throughput Measurement Configuration............................................................ 196
2.4.20 Annex: UE Capabilities............................................................................................... 199
2.5 Programming.............................................................................................................213
2.5.1 General Configuration................................................................................................. 214
2.5.2 BLER Tests................................................................................................................. 238
2.5.3 RLC Throughput Tests................................................................................................243
2.6 Command Reference................................................................................................ 244
2.6.1 Conventions and General Information........................................................................ 245
2.6.2 General Settings......................................................................................................... 248
2.6.3 Connection Control and States................................................................................... 250
2.6.4 Event Log.................................................................................................................... 262
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2.6.5 UE Measurement Report Contents............................................................................. 263
2.6.6 UE Capabilities............................................................................................................271
2.6.7 UE Info........................................................................................................................ 301
2.6.8 Routing Settings..........................................................................................................303
2.6.9 Internal Fading............................................................................................................ 340
2.6.10 Downlink Power Levels............................................................................................... 347
2.6.11 Uplink Power Control.................................................................................................. 353
2.6.12 Physical Cell Setup..................................................................................................... 362
2.6.13 Network Settings......................................................................................................... 368
2.6.14 Connection Configuration............................................................................................390
2.6.15 CQI Reporting Settings............................................................................................... 441
2.6.16 UE Measurement Report Settings.............................................................................. 443
2.6.17 Messaging (SMS)........................................................................................................445
2.6.18 Message Monitoring Settings......................................................................................450
2.6.19 BLER Measurement....................................................................................................451
2.6.20 RLC Throughput Measurement...................................................................................473
2.7 List of Commands.....................................................................................................478
3LTE Multi Evaluation Measurement..................................................492
3.1 What's New in this Revision.....................................................................................492
3.2 General Description.................................................................................................. 493
3.2.1 LTE TX Tests.............................................................................................................. 493
3.2.2 LTE RX Tests..............................................................................................................498
3.2.3 List Mode.....................................................................................................................500
3.2.4 LTE UL Signal Properties............................................................................................506
3.2.5 Limit Settings and Conformance Requirements..........................................................509
3.2.6 Measurement Results................................................................................................. 519
3.3 GUI Reference........................................................................................................... 538
3.3.1 Measurement Control..................................................................................................538
3.3.2 Accessing Parameters and Settings........................................................................... 539
3.3.3 Signal Routing and Analyzer Settings.........................................................................539
3.3.4 Carrier Aggregation Settings.......................................................................................543
3.3.5 Measurement Control Settings....................................................................................546
3.3.6 Trigger Settings...........................................................................................................560
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3.3.7 Limit Settings...............................................................................................................563
3.3.8 Additional Softkeys and Hotkeys.................................................................................564
3.3.9 Measurement Results................................................................................................. 565
3.4 Programming.............................................................................................................567
3.4.1 General Examples.......................................................................................................568
3.4.2 Using LTE List Mode...................................................................................................575
3.5 Command Reference................................................................................................ 580
3.5.1 Conventions and General Information........................................................................ 580
3.5.2 General Measurement Settings.................................................................................. 584
3.5.3 Multi Evaluation Measurement Commands................................................................ 595
3.5.4 Combined Signal Path Commands............................................................................. 726
3.6 List of Commands.....................................................................................................727
4LTE PRACH Measurement................................................................ 740
4.1 What's New in this Revision.....................................................................................740
4.2 General Description.................................................................................................. 740
4.2.1 Test Setup...................................................................................................................741
4.2.2 How to Measure an Uplink PRACH Signal................................................................. 741
4.2.3 Defining the Scope of the Measurement.....................................................................742
4.2.4 Parallel Signaling and Measurement.......................................................................... 743
4.2.5 Trigger Modes............................................................................................................. 743
4.2.6 Calculation of Modulation Results...............................................................................744
4.2.7 LTE PRACH UL Signal Properties.............................................................................. 745
4.2.8 Limit Settings and Conformance Requirements..........................................................747
4.2.9 Measurement Results................................................................................................. 749
4.3 GUI Reference........................................................................................................... 758
4.3.1 Measurement Control..................................................................................................758
4.3.2 Parameters and Settings.............................................................................................759
4.3.3 Measurement Results................................................................................................. 772
4.4 Programming.............................................................................................................774
4.4.1 Key Features...............................................................................................................774
4.4.2 Specifying General and Common Measurement Settings.......................................... 775
4.4.3 Specifying Required PRACH Settings........................................................................ 775
4.4.4 Specifying Additional Measurement-Specific Settings................................................ 775
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4.4.5 Configuring the Trigger System.................................................................................. 776
4.4.6 Specifying Limits......................................................................................................... 776
4.4.7 Performing Single-Shot Measurements...................................................................... 777
4.4.8 Single-Shot and Continuous Measurements...............................................................778
4.5 Command Reference................................................................................................ 779
4.5.1 Conventions and General Information........................................................................ 779
4.5.2 General Measurement Settings.................................................................................. 783
4.5.3 PRACH Measurement Commands............................................................................. 783
4.5.4 Combined Signal Path Commands............................................................................. 812
4.6 List of Commands.....................................................................................................813
5LTE SRS Measurement......................................................................816
5.1 What's New in this Revision.....................................................................................816
5.2 General Description.................................................................................................. 816
5.2.1 Test Setup...................................................................................................................816
5.2.2 How to Measure an Uplink SRS Signal.......................................................................817
5.2.3 Parallel Signaling and Measurement.......................................................................... 817
5.2.4 Trigger Modes............................................................................................................. 818
5.2.5 Limit Settings and Conformance Requirements..........................................................818
5.2.6 Measurement Results................................................................................................. 819
5.3 GUI Reference........................................................................................................... 822
5.3.1 Measurement Control..................................................................................................822
5.3.2 Parameters and Settings.............................................................................................822
5.3.3 Measurement Results................................................................................................. 832
5.4 Programming.............................................................................................................833
5.4.1 Key Features...............................................................................................................833
5.4.2 Specifying General and Common Measurement Settings.......................................... 833
5.4.3 Specifying Additional Measurement-Specific Settings................................................ 834
5.4.4 Configuring the Trigger System.................................................................................. 834
5.4.5 Specifying Limits......................................................................................................... 835
5.4.6 Performing Single-Shot Measurements...................................................................... 835
5.4.7 Single-Shot and Continuous Measurements...............................................................835
5.5 Command Reference................................................................................................ 836
5.5.1 Conventions and General Information........................................................................ 836
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5.5.2 General Measurement Settings.................................................................................. 840
5.5.3 SRS Measurement Commands.................................................................................. 840
5.5.4 Combined Signal Path Commands............................................................................. 850
5.6 List of Commands.....................................................................................................850
Index....................................................................................................852
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Preface
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1 Preface
The operation of the R&S CMW is described in several user manuals:
●The R&S CMW user manual describes the base software, common features of the
firmware applications and basic principles for manual operation and remote control.
●Additional user manuals, like this document, describe the firmware applications.
Rohde & Schwarz provides registered users a "CMW Customer Web" section on
GLORIS, the Global Rohde & Schwarz Information System: https://extranet.rohde-
schwarz.com. From this resource you can download software updates, waveform
library updates and documentation updates, e.g. updates of this document.
1.1 How to Read Firmware Application Chapters
Each firmware application is described in a separate chapter. These chapters can be
read independently of each other. However, they are all organized as follows:
1. General Description
2. Application Sheets (optional)
3. GUI Reference
4. Programming Examples
5. Command Reference
The chapters "System Overview" and "Remote Control" in the R&S CMW user manual
provide additional important information independent of the individual firmware applica-
tions. The most important parts are referenced by the firmware application descrip-
tions.
1.1.1 General Description
This section provides a general description of the firmware application, independent of
a specific operation mode (manual or remote control). It gives a high-level introduction
to the capabilities of the firmware application. Background information related to the
network standard is given as far as it is directly related to administrable parameters.
For measurement applications a detailed description of measurement results and a
description of configurable limits is given, including the relation to conformance require-
ments defined in network standard specifications.
How to Read Firmware Application Chapters
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Preface
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1.1.2 Application Sheets
This optional section provides short application examples for select issues and related
background information.
1.1.3 GUI Reference
The GUI reference describes the manual operation of the firmware application via the
Graphical User Interface (GUI).
The description of a configuration dialog usually starts with a screenshot presenting the
preset values of the parameters (sometimes preset values are modified to enable hid-
den parts of a dialog). Below the screenshot all shown parameters are described. For
each single parameter a link to the corresponding command description in the "Com-
mand Reference" is provided. Ranges for numeric parameters and reset values are
given there.
For measurement results links to the corresponding command descriptions are provi-
ded (commands to retrieve the results). The measurement results are described in
detail in the "General Description".
1.1.4 Programming Examples
The programming examples show how to control and configure the firmware applica-
tion via a remote-control program and how to retrieve measurement results. The exam-
ples consist of comprehensive command sequences. You can check just a single com-
mand of a sequence to get an example for the syntax of this single command. But you
can also consider an entire sequence showing the commands in the context of a com-
mand script, under consideration of dependencies and required orders of the com-
mands.
The command sequences are written with the intention to list most commands of the
firmware application. They do not show the fastest way for a given configuration task.
The fastest way would use many reset values and omit the corresponding commands.
The examples are referenced by the command descriptions of the "Command Refer-
ence".
1.1.5 Command Reference
The command reference provides information on the remote commands of the firm-
ware application. The commands are grouped according to their function.
Each command description indicates the syntax of the command header and of the
parameters. For input parameters the allowed ranges, reset values and default units
are listed, for returned values the expected ranges and default units. Most commands
have a command form and a query form. Exceptions are marked by "Setting only",
"Query only" or "Event". Furthermore a link to the "Programming Examples" is provided
and the first software version supporting the command is indicated.
How to Read Firmware Application Chapters
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LTE Signaling
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2 LTE Signaling
The "LTE signaling" firmware application emulates an E-UTRAN cell and communi-
cates with the UE under test. The UE can synchronize to the downlink signal and
attach to the PS domain. A connection can be set up (3GPP compliant RMC or user-
defined channel).
Two basic signaling options are available: R&S CMW-KS500 for R8 FDD signals and
R&S CMW-KS550 for R8 TDD signals. At least one of these basic options is required
to use the signaling application. Both basic options support only configurations with a
single antenna (SISO).
The basic functionality can be enhanced via the following options:
●R&S CMW-KS502 adds support of DL carrier aggregation for FDD signals.
R&S CMW-KS552 adds support of DL carrier aggregation for TDD signals.
●R&S CMW-KS510 provides advanced parameter settings for R8.
●R&S CMW-KS512 provides advanced parameter settings for R10.
●R&S CMW-KS520 adds support of DL beamforming, MIMO 2x2 and SIMO 1x2.
R&S CMW-KS521 is additionally required for downlink MIMO 4x2.
●R&S CMW-KS525 adds a user-defined operating band with configurable band indi-
cator, frequencies and channel numbers.
●R&S CMW-KE100 and R&S CMW-KE500 enable internal fading.
R&S CMW-KE501 is additionally required for MIMO 4x2 fading
Tests can be performed using the LTE "Multi Evaluation" measurement, the "PRACH"
measurement or the "SRS" measurement (all included in options R&S CMW-KM500
and R&S CMW-KM550).
Data transfer tests can be performed using the Data Application Unit (DAU, option
R&S CMW-B450x and R&S CMW-KM050). The DAU also provides an IMS server for
voice over IMS and SMS over IMS. Audio tests can be performed using the audio
board plus a speech codec (R&S CMW-B400B and R&S CMW-B405A).
The "LTE signaling" application provides additional measurements. For details refer to:
●chapter 2.3.1, "Combined Signal Path Measurements", on page 75
●chapter 2.2.18, "Relative Power Control Tests", on page 61
●chapter 2.3.2, "LTE IP-Based Data Tests", on page 79
●chapter 2.2.19, "Extended BLER Measurement", on page 63
●chapter 2.2.20, "RLC Throughput Measurement", on page 73
2.1 What's New in this Revision
This revision describes version 3.2.80 and later of the "LTE Signaling" firmware appli-
cation. Compared to version 3.2.70, it provides the following new features and
changes:
●RLC throughput measurement, see RLC Throughput Measurement Configuration
What's New in this Revision
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LTE Signaling
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●New scenario for I/Q fading with MIMO 4x2, see Scenario, Fading
●Confidence BLER measurements for setups with carrier aggregation, see Detailed
View: BLER
●UE capability report enhancements, see Annex: UE Capabilities
●Scheduling types:
–"CQI TTI-Based" renamed to "Fixed CQI"
– "Follow WB CQI" also supported for transmission mode 7
– New type "Follow WB PMI", see Follow WB PMI Channels
– New types "Follow WB CQI-RI" and "Follow WB CQI-PMI-RI", see Follow WB
CQI-RI and CQI-PMI-RI Channels
– New type "SPS", see Semi-Persistent Scheduling (SPS)
●Configurable default bearer settings for data application tests, see Default Bearer
●Configurable multiple dedicated bearers for data application tests, see Connect
(hotkey)
●Uplink TTI bundling, see TTI Bundling
●Robust header compression, see ROHC
●PMI and RI reporting for transmission mode 8, see Enable PMI/RI Reporting (TM8)
●UE information enhancements, see UE Info
●Service center time stamp for outgoing SMS, see Service Center Time Stamp
●Command for combined setting of bandwidth, band and channel for PCC and SCC,
see CONFigure:LTE:SIGN<i>:RFSettings:ALL:BWCHannel
●Usage of external Data Application Unit (DAU) installed on another instrument, see
External DAU
Software Version
To check your R&S CMW software version, open the "Setup" dialog and click "HW/SW
Equipment". The initial software version for each remote control command is quoted in
the reference description.
2.2 General Description
The following sections describe how to use the R&S CMW for LTE signaling tests and
provide background information.
●Test Setups.............................................................................................................13
●Initiating Signaling Tests......................................................................................... 19
●Carrier Aggregation.................................................................................................20
●External Fading.......................................................................................................22
●Internal Fading........................................................................................................ 23
●Data Tests and Voice Over LTE............................................................................. 24
●Audio Tests and Speech Quality Tests...................................................................24
●Connection States...................................................................................................25
●Handover.................................................................................................................28
General Description
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LTE Signaling
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●Physical DL Channels and Signals......................................................................... 30
●MIMO and Beamforming.........................................................................................34
●Scheduling Type RMC............................................................................................ 39
●User-Defined Channels...........................................................................................51
●CQI Channels..........................................................................................................53
●Semi-Persistent Scheduling (SPS)......................................................................... 56
●Operating Bands..................................................................................................... 57
●Trigger Signals........................................................................................................60
●Relative Power Control Tests..................................................................................61
●Extended BLER Measurement................................................................................63
●RLC Throughput Measurement...............................................................................73
2.2.1 Test Setups
The following sections provide an overview of typical test setups for the individual sce-
narios.
2.2.1.1 Test Setup for Scenario 1 Cell - 1 RF Out
The basic test setup for a "1 Cell - 1 RF Out" scenario uses a bidirectional RF connec-
tion between the tester and the device under test (DUT). It carries both the downlink
and the uplink signal:
●The R&S CMW transmits the downlink signal to which the DUT can synchronize in
order to perform an attach. The downlink signal is used to transfer signaling mes-
sages and user data to the DUT.
●The DUT transmits an uplink signal that the R&S CMW can receive and decode in
order to set up a connection and perform various measurements.
For this setup, the DUT is connected to one of the bidirectional RF COM connectors at
the front panel of the R&S CMW. No additional cabling and no external trigger are nee-
ded. The input level ranges of all RF COM connectors are identical.
See also: "RF Connectors" in the R&S CMW user manual, chapter "Getting Started"
Fig. 2-1: Test setup for "1 Cell - 1 RF Out"
2.2.1.2 Test Setup for Scenario 1 Cell - 2 RF Out
The scenario "1 Cell - 2 RF Out" is used for setups with two UE RX antennas (SIMO
1x2, MIMO 2x2, MIMO 4x2 and beamforming). A test setup for this scenario involves
one uplink and two downlink signals at the UE side. Typically, one bidirectional con-
General Description
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LTE Signaling
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nection carries one uplink and one downlink signal. An additional connection carries
the second downlink signal. The two downlink signals must be transmitted via different
TX modules and different RF connectors, which implies that the instrument must sup-
port at least two TX paths. You can use for example RF 1 COM for the bidirectional
connection and RF 3 COM for the second downlink connection.
Fig. 2-2: Test setup for "1 Cell - 2 RF Out"
Using several signaling applications in parallel
Depending on the installed hardware and software options, you can run several signal-
ing application instances in parallel.
Example: Assume an instrument with two Signaling Unit Wideband (SUW), one Signal-
ing Unit Universal (SUU), four TX paths and four RX paths.
This instrument allows you to run for example:
●Two LTE signaling instances using the "1 Cell - 2 RF Out" scenario, or
●Two LTE signaling instances using the "1 Cell - 1 RF Out" scenario, plus one
instance of an SUU signaling application (e.g. GSM / CDMA2000)
●One LTE signaling instance using the "1 Cell - 2 RF Out" scenario, plus one
instance of an SUW signaling application (e.g. WCDMA)
●One LTE signaling instance using a carrier aggregation scenario with or without
MIMO
The LTE and WCDMA signaling applications both use the SUW. Signaling instance 1
uses SUW1, while instance 2 uses SUW2. An SUW can only be used by one instance
at a time. You can run for example LTE signaling instance 2 and WCDMA signaling
instance 1 in parallel, but not instance 1 of both applications.
2.2.1.3 Test Setup for Scenario 1 Cell - 4 RF Out
The scenario "1 Cell - 4 RF Out" is used for MIMO 4x2 setups, where the four TX
antenna signals must be available at the RF connectors. Typically, an external RF
fader is inserted into the downlink connection and one bidirectional connection carries
one uplink and one downlink signal. Three additional connections carry the other
downlink signals.
All downlink signals must be transmitted via different TX modules and different RF con-
nectors, which implies that the instrument must support four TX paths and must be
equipped with two signaling units SUW.
General Description
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Fig. 2-3: Test setup for "1 Cell - 4 RF Out"
2.2.1.4 Test Setup for Carrier Aggregation Scenarios
The Carrier Aggregation (CA) scenarios allow you to establish a Release 10 connec-
tion with two component carriers in the downlink. The two carriers are called Primary
Component Carrier (PCC) and Secondary Component Carrier (SCC).
For each downlink carrier you can have one output path (SISO, scenario "2CC CA - 2
RF Out") or two output paths (e.g. MIMO nx2, scenario "2CC CA - 4 RF Out").
So a test setup for carrier aggregation involves one uplink and two or four downlink sig-
nals. Each output path must use a different TX module. The two output paths of a car-
rier must use different RF connectors.
The first PCC output path and the first SCC output path can be routed to the same
connector (advanced frontend required) or to different connectors. The same applies to
the second PCC and SCC output paths. Select the appropriate setup depending on the
number of RX antenna connectors of your UE. There is no need for external combin-
ers.
The following example setup is suitable for CA with MIMO nx2 and a UE with only two
antenna connectors. RF 1 COM is used for the uplink, the first PCC downlink and the
first SCC downlink. RF 3 COM is used for the second PCC downlink and the second
SCC downlink.
Fig. 2-4: Test setup for CA, MIMO nx2, 2 DUT antenna connectors
The following example setup is suitable for CA with MIMO nx2 and a UE with four
antenna connectors. Each downlink signal is routed to a different connector.
General Description
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LTE Signaling
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Fig. 2-5: Test setup for CA, MIMO nx2, 4 DUT antenna connectors
For CA without MIMO you could for example use only RF 1 COM (uplink, PCC down-
link and SCC downlink). Or you could use RF 1 COM (uplink and PCC downlink) and
RF 3 COM (SCC downlink).
2.2.1.5 Test Setup for Scenario IQ out - RF in
For the scenario "IQ out - RF in" the uplink RF signal is routed via an RF COM connec-
tor at the front panel. The downlink digital I/Q signal is routed via a DIG IQ OUT con-
nector at the rear panel. This connector is only available if an I/Q board is installed
(option R&S CMW-B510x/-B520x). Additional instruments can be inserted into the
downlink path to manipulate the downlink signal.
A typical use case is to insert an R&S SMU200A into the downlink path to superimpose
fading on the downlink signal. The following figure provides an overview of this setup.
In this example the R&S SMU200A is synchronized to a 10-MHz reference signal pro-
vided by the R&S CMW. It is also possible to synchronize the R&S CMW to the R&S
SMU200A.
The following figure shows a possible rear panel cabling using the first I/Q board (DIG
IQ 1 to 4).
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Fig. 2-6: Test setup for scenario "IQ out - RF in" (example)
2.2.1.6 Test Setup for External Fading Scenarios
In order to superimpose fading on the baseband signal, you can integrate an
R&S AMU200A into a test setup. The R&S AMU200A must be connected to the digital
I/Q interface of the R&S CMW. At least one I/Q board must be installed at the
R&S CMW for that purpose (option R&S CMW-B510x/-B520x).
All connections between R&S CMW and R&S AMU200A are established via the rear
panels of the instruments.
The following figure shows a setup with two downlink paths using the first I/Q board
(DIG IQ 1 to 4).
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For a setup with only one downlink path you need only two of the four I/Q data connec-
tions.
For MIMO 4x2 fading, you need two R&S AMU200A and two I/Q boards. One
R&S AMU200A is connected to the first I/Q board, the other to the second I/Q board.
To synchronize the external faders, you need a trigger signal. Route an LTE signaling
trigger signal to the TRIG A R&S CMW connector and feed the signal to the external
faders.
The RF connections between R&S CMW and DUT must be established in the same
way as without external fading.
2.2.1.7 Test Setup for Internal Fading Scenarios
For internal fading scenarios, the test setup is the same as for the corresponding sce-
nario without fading.
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2.2.2 Initiating Signaling Tests
The signal generator of the "LTE signaling" application is controlled like any realtime
signal generator, see chapter 2.4.2, "Signaling Control", on page 112.
The LTE downlink signal is turned on as long as the "LTE Signaling" softkey indicates
the "ON" state. After switching on, wait until the hour glass symbol has disappeared.
When DL signal transmission has been turned on, the connection states can be con-
trolled via hotkeys at the R&S CMW and via actions at the UE.
The default settings of the R&S CMW generally ensure a DL signal with suitable char-
acteristics for connection setup. The most important settings can be modified directly in
the main view.
Performing measurements
The required settings vary depending on the measurement to be performed. However,
the following general procedure is applicable to most measurements.
1. Connect your UE to the R&S CMW (see chapter 2.2.1, "Test Setups", on page 13).
2. Open the "LTE signaling" firmware application.
3. Configure the signaling application according to the test to be performed.
4. To turn on the DL signal, press ON | OFF and wait until the "LTE Signaling" softkey
indicates the "ON" state and the hour glass symbol has disappeared.
5. Switch on the UE.
The UE synchronizes to the DL signal and attaches. Note the connection states
displayed in the main view.
6. If the RRC connection has been released after the attach, set up a connection.
You can configure, whether the RRC connection is kept or not, see "Keep RRC
Connection" on page 165.
7. To switch to the measurement application, press the "LTE TX Meas" or "LTE Ext
BLER" softkey. The LTE extended BLER measurement is provided by the "LTE
Signaling" firmware application. The LTE TX measurements are available as option
R&S CMW-KM500/-KM550.
8. Configure and start the measurement.
If the UE fails to attach
Check the following R&S CMW settings:
●The "Duplex Mode" must be supported by the UE.
●The "Frequency" of the generated DL signal must be within the frequency band
supported by the UE.
●The "Downlink Power Levels", especially the "RS EPRE" must be sufficient so that
the UE under test can receive the DL signal.
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●The "Uplink Power Control" settings must be appropriate so that the UL signal is
strong enough to be received and decoded by the R&S CMW.
●The UE capabilities must be in accordance with the security settings in the "Net-
work" section of the configuration dialog.
The attach procedure can fail if authentication or security is disabled but the UE
expects/requires an authentication or security procedure. It can also fail if authenti-
cation or security is enabled but not supported by the UE or the secret key does
not match.
An appropriate USIM can be obtained from Rohde & Schwarz (R&S CMW-Z04,
stock no. 1207.9901.02).
●Some UEs need a DL signal without padding bits for attach. You can disable down-
link padding in the "Connection" section of the configuration dialog.
If the measurement does not start
If the measurement does not start at all while the signaling application generates a
downlink signal, verify that the combined signal path scenario is selected in the mea-
surement.
2.2.3 Carrier Aggregation
Carrier aggregation is an LTE-Advanced Release 10 feature. It aggregates several
component carriers in order to reach a higher bandwidth. Each single component car-
rier is compliant with Release 8.
The R&S CMW supports the aggregation of two downlink carriers, resulting in a band-
width of up to 40 MHz.
The two carriers can be located in the same operating band using a continuous spec-
trum (intraband contiguous carrier aggregation), or in the same operating band with a
frequency gap between the two carriers (intraband non-contiguous carrier aggregation)
or in different operating bands (interband carrier aggregation).
Most settings can be configured independently for the two carriers, for example the
carrier frequency, bandwidth, downlink power, scheduling type and related channel
settings.
According to 3GPP, a connection setup with carrier aggregation is a two step proce-
dure. In the first step, a Release 8 single carrier connection is set up. The used carrier
is called Primary Component Carrier (PCC). In the second step an additional carrier is
added, called Secondary Component Carrier (SCC).
Access procedures like cell search, cell selection and initial random access are only
performed on the PCC, not on the SCC. The SCC is added, deleted or modified using
an "RRC Connection Reconfiguration" message.
Options required for carrier aggregation:
●R&S CMW-KS502 for FDD carrier aggregation
●R&S CMW-KS552 for TDD carrier aggregation
●R&S CMW-KS512 for advanced carrier aggregation settings
●Two Signaling Unit Wideband (SUW)
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