Rohde & Schwarz CMW-KM75 Series User manual

R&S®CMW-KM75x/-KS75x/-KS76x
TD-SCDMA Firmware Applications
User Manual
User Manual
1173.9670.02 ─ 18
(;×îÔ2)
Test & Measurement
深圳德标仪器 135-1095-0799

This user manual describes the following R&S®CMW options:
●R&S®CMW-KM750 (TD-SCDMA, TX measurement, uplink)
●R&S®CMW-KM751 (TD-SCDMA enhancement, TX measurement, uplink)
●R&S®CMW-KM012 (TX measurement, multi evaluation list mode)
●R&S®CMW-KS750 (TD-SCDMA R4, basic signaling)
●R&S®CMW-KS751 (TD-SCDMA R5 HSDPA / R7 HSUPA, basic signaling)
●R&S®CMW-KS760 (TD-SCDMA R4, advanced signaling)
●R&S®CMW-KE100 (Basic fading support: AWGN generator)
●R&S®CMW-KE750 (TD-SCDMA fading profiles from TS 34.122 Annex D.2, excerpts)
© 2016 Rohde & Schwarz GmbH & Co. KG
Mühldorfstr. 15, 81671 München, Germany
Phone: [phone] - 0
Fax: [phone]
Email: [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.
深圳德标仪器 135-1095-0799

Contents
R&S®CMW-KM75x/-KS75x/-KS76x
3User Manual 1173.9670.02 ─ 18
Contents
1 Preface.................................................................................................... 7
1.1 R&S CMW Models......................................................................................................... 7
1.2 How to Read Firmware Application Chapters............................................................ 7
1.2.1 General Description........................................................................................................ 8
1.2.2 Application Sheets.......................................................................................................... 8
1.2.3 GUI Reference................................................................................................................ 8
1.2.4 Programming Examples..................................................................................................8
1.2.5 Command Reference...................................................................................................... 9
2 TD-SCDMA Signaling...........................................................................10
2.1 What's New in this Revision.......................................................................................10
2.2 General Description.................................................................................................... 10
2.2.1 Test Setups................................................................................................................... 11
2.2.2 Initiating Signaling Tests............................................................................................... 13
2.2.3 End to End Packet Data Connections...........................................................................15
2.2.4 Audio Measurements.................................................................................................... 16
2.2.5 External Fading............................................................................................................. 17
2.2.6 Internal Fading.............................................................................................................. 18
2.2.7 Connection States.........................................................................................................19
2.2.8 TD-SCDMA Signal Properties.......................................................................................23
2.2.9 Physical DL Channels................................................................................................... 27
2.2.10 Handover.......................................................................................................................31
2.2.11 Connection Types......................................................................................................... 32
2.2.12 Frequency Bands.......................................................................................................... 37
2.2.13 Trigger Signals.............................................................................................................. 37
2.2.14 Transmitter Power Control (TPC)..................................................................................38
2.2.15 Random Access Procedure.......................................................................................... 42
2.2.16 BER Measurement........................................................................................................43
2.2.17 HSDPA ACK Measurement.......................................................................................... 48
2.3 Application Sheets......................................................................................................51
2.3.1 Combined Signal Path Measurements..........................................................................51
2.3.2 Handover from TD-SCDMA to GSM............................................................................. 56
深圳德标仪器 135-1095-0799

Contents
R&S®CMW-KM75x/-KS75x/-KS76x
4User Manual 1173.9670.02 ─ 18
2.3.3 Inner Loop Power Control Tests................................................................................... 59
2.4 GUI Reference............................................................................................................. 63
2.4.1 Signaling View...............................................................................................................64
2.4.2 Signaling and Connection Control.................................................................................78
2.4.3 Using the Shortcut Softkeys..........................................................................................81
2.4.4 General Settings........................................................................................................... 82
2.4.5 I/Q Settings................................................................................................................... 84
2.4.6 RF Settings................................................................................................................... 85
2.4.7 TDD Slot and UE Info Configuration............................................................................. 90
2.4.8 Internal Fading.............................................................................................................. 90
2.4.9 Physical Downlink Settings........................................................................................... 94
2.4.10 Physical Uplink Settings................................................................................................97
2.4.11 Connection Configuration............................................................................................103
2.4.12 Network Settings......................................................................................................... 110
2.4.13 HSDPA Settings..........................................................................................................122
2.4.14 UE Measurement Report Settings.............................................................................. 123
2.4.15 Messaging (SMS) Parameters.................................................................................... 125
2.4.16 Shortcut Configuration................................................................................................ 126
2.4.17 Message Monitoring Settings......................................................................................127
2.4.18 BER Measurement Configuration............................................................................... 128
2.4.19 HSDPA ACK Measurement Configuration.................................................................. 131
2.5 Programming.............................................................................................................135
2.5.1 Signaling Application...................................................................................................135
2.5.2 BER Tests................................................................................................................... 148
2.5.3 HSDPA ACK Tests......................................................................................................149
2.6 Command Reference................................................................................................ 151
2.6.1 Conventions and General Information........................................................................ 151
2.6.2 General Settings......................................................................................................... 156
2.6.3 Connection Control and States................................................................................... 157
2.6.4 Signaling Information.................................................................................................. 166
2.6.5 Routing Settings..........................................................................................................180
2.6.6 Internal Fading............................................................................................................ 188
2.6.7 General Physical Channel Settings.............................................................................194
深圳德标仪器 135-1095-0799

Contents
R&S®CMW-KM75x/-KS75x/-KS76x
5User Manual 1173.9670.02 ─ 18
2.6.8 Physical Channel Downlink Settings...........................................................................195
2.6.9 Physical Channel Uplink Settings............................................................................... 200
2.6.10 Connection Configuration............................................................................................210
2.6.11 Network Settings......................................................................................................... 218
2.6.12 HSDPA Settings..........................................................................................................238
2.6.13 UE Measurement Report Settings.............................................................................. 239
2.6.14 Messaging (SMS)........................................................................................................241
2.6.15 Message Monitoring Settings......................................................................................244
2.6.16 BER Measurement......................................................................................................245
2.6.17 HSDPA ACK Measurement........................................................................................ 251
2.7 List of Commands.....................................................................................................260
3 TD-SCDMA Multi Evaluation Measurement..................................... 266
3.1 What's New in this Revision.....................................................................................266
3.2 General Description.................................................................................................. 266
3.2.1 TD-SCDMA TX Tests..................................................................................................267
3.2.2 TD-SCDMA RX Tests................................................................................................. 269
3.2.3 Multi Evaluation List Mode.......................................................................................... 270
3.2.4 TD-SCDMA Signal Properties.....................................................................................273
3.2.5 Limit Settings and Conformance Requirements..........................................................277
3.2.6 Measurement Results................................................................................................. 282
3.3 GUI Reference........................................................................................................... 290
3.3.1 Measurement Control..................................................................................................290
3.3.2 Parameters and Settings.............................................................................................291
3.3.3 Measurement Results................................................................................................. 308
3.4 Programming.............................................................................................................311
3.4.1 General Examples.......................................................................................................311
3.4.2 Using the TD-SCDMA List Mode................................................................................ 317
3.5 Command Reference................................................................................................ 320
3.5.1 Conventions and General Information........................................................................ 320
3.5.2 General Measurement Settings.................................................................................. 326
3.5.3 Multi Evaluation Measurement Commands................................................................ 338
3.5.4 Combined Signal Path Commands............................................................................. 418
3.6 List of Commands.....................................................................................................420
深圳德标仪器 135-1095-0799

Contents
R&S®CMW-KM75x/-KS75x/-KS76x
6User Manual 1173.9670.02 ─ 18
4 TD-SCDMA TPC Measurement..........................................................428
4.1 What's New in this Revision.....................................................................................428
4.2 General Description.................................................................................................. 428
4.2.1 Test Setup...................................................................................................................429
4.2.2 How to Perform a Measurement................................................................................. 429
4.2.3 Parallel Signaling and Measurement.......................................................................... 431
4.2.4 Trigger Modes............................................................................................................. 431
4.2.5 TPC Setups.................................................................................................................433
4.2.6 Limit Settings and Conformance Requirements..........................................................434
4.2.7 Measurement Results................................................................................................. 437
4.3 GUI Reference........................................................................................................... 441
4.3.1 Measurement Control..................................................................................................441
4.3.2 Parameters and Settings.............................................................................................441
4.3.3 Measurement Results................................................................................................. 447
4.4 Programming.............................................................................................................448
4.4.1 Measurements with Standalone Scenario...................................................................448
4.4.2 Measurements with Combined Signal Path Scenario................................................. 451
4.5 Command Reference................................................................................................ 454
4.5.1 Conventions and General Information........................................................................ 454
4.5.2 General Measurement Settings.................................................................................. 458
4.5.3 TPC Measurement Commands...................................................................................458
4.5.4 Combined Signal Path Commands............................................................................. 477
4.6 List of Commands.....................................................................................................477
Index....................................................................................................479
深圳德标仪器 135-1095-0799

Preface
R&S®CMW-KM75x/-KS75x/-KS76x
7User Manual 1173.9670.02 ─ 18
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.
There is a separate manual version for each R&S CMW model.
●Additional user manuals, like this document, describe the firmware applications.
There is only one version of these manuals for all R&S CMW models.
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, for example updates of this document.
1.1 R&S CMW Models
The R&S CMW software supports several instrument models. Depending on the
model, only a subset of the software packages and software options is allowed.
To check whether this document is relevant for your instrument model and which soft-
ware options are supported, refer to the preface of your model-specific base user man-
ual. The PDF filename of this manual starts with CMW<Model>_UserManual, for
example CMW500_UserManual.
1.2 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.
How to Read Firmware Application Chapters
深圳德标仪器 135-1095-0799

Preface
R&S®CMW-KM75x/-KS75x/-KS76x
8User Manual 1173.9670.02 ─ 18
1.2.1 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.
1.2.2 Application Sheets
This optional section provides short application examples for select issues and related
background information.
1.2.3 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".
1.2.4 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".
How to Read Firmware Application Chapters
深圳德标仪器 135-1095-0799

Preface
R&S®CMW-KM75x/-KS75x/-KS76x
9User Manual 1173.9670.02 ─ 18
1.2.5 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
深圳德标仪器 135-1095-0799

TD-SCDMA Signaling
R&S®CMW-KM75x/-KS75x/-KS76x
10User Manual 1173.9670.02 ─ 18
2 TD-SCDMA Signaling
The "TD-SCDMA Signaling" firmware application (option R&S CMW-KS750) allows the
R&S CMW to emulate a TD-SCDMA cell and to communicate with the UE under test.
The UE can synchronize to the downlink signal, register to the Circuit Switched (CS)
domain and attach to the Packet Switched (PS) domain. A mobile originating or mobile
terminating connection can be set up.
The basic R4 signaling functionality provided by R&S CMW-KS750 can be enhanced
by the following options:
●R&S CMW-KS760: advanced parameter settings for R4
●R&S CMW-KS751: basic signaling for R5/7, e.g. setup of an HSDPA test mode
connection
Most tests can be performed using the "TD-SCDMA Multi Evaluation Measurement" or
the "TD-SCDMA TPC Measurement" included in option R&S CMW-KM750. Data trans-
fer tests can be performed using the Data Application Unit (DAU, option R&S CMW-
B450x and R&S CMW-KM050).
Additionally measurements are provided by the "TD-SCDMA Signaling" application.
For details refer to:
●BER Measurement
●HSDPA ACK Measurement
2.1 What's New in this Revision
This revision describes version 3.5.30 and later of the "TD-SCDMA Signaling" firmware
application. Compared to the version 3.5.21 the following features have been added.
●Internal fading for standard cell
– For scenario, see General Settings
– For description, see Internal Fading
– For configuration, see Internal Fading
●Audio delay measurement, see CMW Voice Info
●Additional UpPCH settings for open loop power control tests, see Ignore RACH
●Remote commands for event log entries, see Event Log
2.2 General Description
The following sections describe how to use the R&S CMW for TD-SCDMA signaling
tests and provide background information.
●Test Setups.............................................................................................................11
●Initiating Signaling Tests......................................................................................... 13
●End to End Packet Data Connections.....................................................................15
General Description
深圳德标仪器 135-1095-0799

TD-SCDMA Signaling
R&S®CMW-KM75x/-KS75x/-KS76x
11User Manual 1173.9670.02 ─ 18
●Audio Measurements.............................................................................................. 16
●External Fading.......................................................................................................17
●Internal Fading........................................................................................................ 18
●Connection States...................................................................................................19
●TD-SCDMA Signal Properties.................................................................................23
●Physical DL Channels.............................................................................................27
●Handover.................................................................................................................31
●Connection Types................................................................................................... 32
●Frequency Bands....................................................................................................37
●Trigger Signals........................................................................................................37
●Transmitter Power Control (TPC)............................................................................38
●Random Access Procedure.................................................................................... 42
●BER Measurement..................................................................................................43
●HSDPA ACK Measurement.................................................................................... 48
2.2.1 Test Setups
These sections provide an overview of typical test setups for the individual scenarios.
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 TD-SCDMA signaling instances using the standard cell scenario plus one
instance of an SUU signaling application (e.g. GSM / CDMA2000), or
●one TD-SCDMA signaling instance plus one instance of an SUW signaling applica-
tion (e.g. LTE) and one instance of an SUU signaling application.
The LTE and TD-SCDMA 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 TD-SCDMA
signaling instance 1 in parallel, but not instance 1 of both applications.
2.2.1.1 Test Setup for Standard Cell Scenario
The basic test setup for a standard cell scenario uses a bidirectional RF connection
between the tester and the device under test (DUT), carrying both the downlink and the
uplink signal:
●The R&S CMW transmits the downlink signal to which the DUT can synchronize in
order to register or 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.
General Description
深圳德标仪器 135-1095-0799

TD-SCDMA Signaling
R&S®CMW-KM75x/-KS75x/-KS76x
12User Manual 1173.9670.02 ─ 18
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 is 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"
Figure 2-1: Test setup for standard cell
2.2.1.2 Test Setup for External Fading Scenarios
In order to superimpose fading on the baseband signal, you can integrate an external
fader (e.g. R&S SMW200A) into a test setup. The external fader 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 SMW200A 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).
General Description
深圳德标仪器 135-1095-0799

TD-SCDMA Signaling
R&S®CMW-KM75x/-KS75x/-KS76x
13User Manual 1173.9670.02 ─ 18
For a setup with only one downlink path you need only two of the four I/Q data connec-
tions.
The RF connections between R&S CMW and DUT must be established in the same
way as without external fading.
2.2.1.3 Test Setup for Internal Fading Scenario
If internal fading shall be used, the test setup is the same as for the corresponding sce-
nario without fading. The R&S CMW adds the fading signal to the original downlink sig-
nal.
2.2.2 Initiating Signaling Tests
The signal generator of the "TD-SCDMA Signaling" application is controlled like any
real-time signal generator, see Chapter 2.4.2, "Signaling and Connection Control",
on page 78.
General Description
深圳德标仪器 135-1095-0799

TD-SCDMA Signaling
R&S®CMW-KM75x/-KS75x/-KS76x
14User Manual 1173.9670.02 ─ 18
The TD-SCDMA downlink signal is turned on as long as the "TD-SCDMA 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 controlled 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.
Checks in case of failed registration or attach
If the registration of the UE fails, check the demodulation info (see "CMW Demod. Info"
on page 65) and the following R&S CMW settings:
●The "Frequency" of the generated DL signal must be within the frequency bands
supported by the UE.
●The "Expected Nominal Power" must be in accordance with the uplink signal
power.
●The power level of physical DL channels must be sufficient so that the UE under
test can receive the DL signal.
●The security settings in the "Network" section of the configuration dialog must be in
accordance with the UE capabilities.
Registration can fail if authentication or security is disabled but the UE expects/
requires an authentication or security procedure. It can also fail if authentication or
security is enabled but not supported by the UE or the SIM card type or secret key
do not match.
An appropriate 3GPP USIM can be obtained from Rohde & Schwarz (R&S CMW-
Z04, stock no. 1207.9901.02).
Performing measurements
The required settings vary depending on the measurement to be performed. However,
the general procedure outlined below is applicable to most measurements.
1. Connect your UE to the R&S CMW (see Test Setups).
2. Open the "TD-SCDMA Signaling" firmware application.
3. Configure the signaling application according to the test to be performed. For TX
measurements it is recommended to disable measurement reporting.
4. To turn on the DL signal, press "ON | OFF" and wait until the "TD-SCDMA Signal-
ing" 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 registers (attaches). Note the connec-
tion states displayed in the main view.
6. Set up a UE originated or UE terminated connection.
7. Use the "TD-SCDMA RX Meas" or "TD-SCDMA Multi Eval." softkey to switch to the
measurement application. The TD-SCDMA RX measurements are provided by the
General Description
深圳德标仪器 135-1095-0799

TD-SCDMA Signaling
R&S®CMW-KM75x/-KS75x/-KS76x
15User Manual 1173.9670.02 ─ 18
"TD-SCDMA Signaling" firmware application. The TD-SCDMA TX measurements
are available as option R&S CMW-KM750.
8. Configure and start the measurement.
2.2.3 End to End Packet Data Connections
To set up a TD-SCDMA packet data connection you need the Data Application Unit
(DAU) in addition to the "TD-SCDMA Signaling" application. The DAU itself is available
as option R&S CMW-B450x and the DAU measurements as R&S CMW-KM050. For
IPv4 option R&S CMW-KA100 is required, for IPv6 additionally option R&S CMW-
KA150.
To set up an end to end packet data connection, proceed as follows:
1. Configure the IP settings of DAU according to the DAU documentation.
2. Enable packet switched services, see "Packet Switched Domain" on page 111.
3. Verify, that the Enable Data End to End is set to ON.
4. Configure the packet data parameters, see Chapter 2.4.11.6, "Packet Data",
on page 109.
5. Configure any other settings as desired (as for a connection without the DAU) and
switch on the cell signal.
6. Register / attach the UE.
7. Initiate a mobile originated packet data connection at the UE.
It is not possible to initiate a mobile terminated packet data connection at the
instrument.
When the packet data connection has been established, you can use the DAU to per-
form IP-based data tests (see DAU documentation).
You can also perform other measurements that do not require a DAU, e.g. TX mea-
surements. The BER measurement can not be performed with a packet data connec-
tion.
Most measurements require the transmission of data. For a test mode connection the
signaling application takes care of downlink data transmission. For a packet data con-
nection the signaling application does not transfer data, so you must generate IP traffic
by other means, e.g. using the DAU. You may for example initiate an IPerf measure-
ment or an FTP data transfer. For details refer to the DAU documentation.
Some DAU measurements and applications require to enter the IP address(es)
assigned to the UE. You can retrieve this information from the UE info section, see
Chapter 2.4.1.5, "UE Info", on page 75.
General Description
深圳德标仪器 135-1095-0799

TD-SCDMA Signaling
R&S®CMW-KM75x/-KS75x/-KS76x
16User Manual 1173.9670.02 ─ 18
2.2.4 Audio Measurements
The "Audio Measurement" application provides an audio signal for audio tests and can
analyze the audio signal by means of audio measurement option. This allows for
example microphone- and speaker tests for a mobile phone.
In addition the audio board houses a speech codec board, that provides an interface to
the signaling units of the R&S CMW. It decodes the signal delivered by a "TD-SCDMA
Signaling" application or encodes an audio signal and delivers it to the "TD-SCDMA
Signaling" application.
The speech codec allows a signaling application TD-SCDMA to support the whole
transmission chain of the signal from analog input into the DUT's microphone through
the RF to the output of the AF signal, as well as the reverse way. Here, the format of
the AF signal is selectable between digital (SPDIF), and analog (AF connectors).
Which option is required, depends on your instrument:
●Option R&S CMW-B400B "Audio Analyzer/Generator" is compatible to R&S CMW
delivered after November 2011. It is also compatible to R&S CMW delivered before
November 2011, that have been upgraded with R&S CMW-U5024.
●Option R&S CMW-U400 "Audio Analyzer/Generator" is compatible to R&S CMW
delivered before November 2011, that have not been upgraded with R&S CMW-
U5024.
●The audio board must be enhanced with a speech codec board (R&S CMW-
B405A).
●The latest audio firmware/software package (Setup_CMW_AUDIO.exe) has to be
installed at your R&S CMW. This firmware application provides the routing of
speech coder either to audio connectors or to internal audio generator and mea-
surements.
RF speech connection
●In "TD-SCDMA Signaling", the routing to the speech codec is done via Voice
Source = "Speech".
●In the "Audio Measurement" application select appropriate scenario (e.g. "External
Analog Speech Analysis") to be used.
Select the controlling master application to couple the "TD-SCDMA Signaling" with
the "Audio Measurement" ("Controlled by" setting). Afterwards, the TD-SCDMA sig-
naling is connected to the speech codec.
●Configure coding rates for NB AMR connection, see "NB AMR" on page 105.
While the speech decoder detects the coding rate of the incoming speech packets
and can adapt to it, the speech encoder uses only the configured coding rate.
●The event log monitors the connection to the speech codec board.
General Description
深圳德标仪器 135-1095-0799

TD-SCDMA Signaling
R&S®CMW-KM75x/-KS75x/-KS76x
17User Manual 1173.9670.02 ─ 18
The audio signal is to be analyzed by means of the audio measurements application.
The TD-SCDMA TX measurements evaluate the different characteristics of the signal
as well.
For the detailed information and test setups refer to the user manual of the audio mea-
surements application.
2.2.5 External Fading
An external fading scenario allows you to route the downlink baseband signal to an
external fader that superimposes fading on the signal and routes it back. Thus fading
can be added to the downlink signal.
Configuring and activating fading
1. Connect the DUT and the external fader (e.g. R&S SMW200A) to the R&S CMW
(see Chapter 2.2.1.2, "Test Setup for External Fading Scenarios", on page 12).
2. Configure the signaling application according to the test to be performed, espe-
cially select an external fading scenario and configure the downlink settings.
3. In the configuration tree, section "IQ Settings > IQ Out", note the "Baseband PEP"
and the "Crest Factor".
4. Configure the external fader, especially the following settings:
Reference oscillator settings:
● Set source to External
● Set external reference frequency to 10 MHz
Baseband input settings for all used connectors:
● Set sample rate as user-defined to 100 MHz
● Baseband input level: enter the crest factor and the PEP displayed in step 3.
Digital I/Q output settings for all used connectors:
● Set sample rate as user-defined to 100 MHz
● Set output signal level via peak level PEP
● Set PEP to the value displayed in step 3
5. In the external fader, activate fading and note the signal level. If you add noise to
the signal, note the signal level without noise.
6. Configure the I/Q input of the R&S CMW:
In the configuration tree, section "IQ Settings > IQ In > Baseband Level", enter the
signal level noted in the previous step.
Alternatively it is also possible, to specify the signal output level of the external
fader, to note the resulting PEP and to enter this PEP value at the R&S CMW for
"Baseband PEP". But this is not recommended.
7. Turn on the downlink signal at the signaling application and set up a connection.
The configuration is now complete. Fading is active.
General Description
深圳德标仪器 135-1095-0799

TD-SCDMA Signaling
R&S®CMW-KM75x/-KS75x/-KS76x
18User Manual 1173.9670.02 ─ 18
A reconfiguration of the settings at the external fader during an active connection to
the DUT may result in the loss of the connection or in erroneous measurement
results.
After a reconfiguration of the baseband input settings of the external fader, turn the
downlink signal at the signaling application off and on again.
2.2.6 Internal Fading
Testing under realistic air interface conditions is important in order to verify the receiver
performance and the correct operation of the DUT's protocol stack implementation. For
example, block error rates, throughput performance and correct operation of layer 1
procedures like Hybrid Automatic Repeat Request (HARQ) retransmission can be eval-
uated.
The internal fading module comes with a fading simulator and AWGN generator that
can be selectively enabled. It manipulates the generated downlink I/Q data stream to
emulate typical signal conditions at the DUT's receiver.
The following options are required to use the internal fading simulator in TD-SCDMA:
●one fader I/Q board R&S CMW-B510F or R&S CMW-B520F per signaling instance
using internal fading
●one option R&S CMW-KS760 "TD-SCDMA R4, advanced signaling" per signaling
instance using fading
●a single option R&S CMW-KE100 "Basic fading support: AWGN generator"
●a single option R&S CMW-KE750 "TD-SCDMA fading profiles from TS 34.122
Annex D.2 (excerpts)"
2.2.6.1 Fading Simulator
Multi-path fading is an effect which occurs in real world situations. A signal sent from
the base station may take different routes (direct line of sight and/or reflected) and
reach the receiving antenna at different times leading to a sum of phase shifted and, if
the receiver is moving, frequency shifted signals.
The internal fading simulator supports propagation conditions defined in Annex D.2 of
3GPP TS 34.122 e.g. multipath, moving propagation, birth-death propagation, or high
speed train propagation.
A faded signal has a higher crest factor than an unfaded one. In order to avoid distor-
tion, the baseband signal must be attenuated before entering the fading module, with
the necessary attenuation (insertion loss) depending on the selected fading profile.
In TD-SCDMA signaling, the insertion loss at the baseband level can be calculated
automatically or set manually. It is automatically compensated on the HF level, which
implies a shift of the allowed DL power level range to the same extent, but in opposite
direction.
General Description
深圳德标仪器 135-1095-0799

TD-SCDMA Signaling
R&S®CMW-KM75x/-KS75x/-KS76x
19User Manual 1173.9670.02 ─ 18
2.2.6.2 AWGN Generator
Additional White Gaussian Noise (AWGN) is typically modeled in receiver tests,
because it may lead to a decrease of throughput. The quality of the received signal is
affected by the ratio of the signal power to the surrounding traffic noise level (signal to
noise ratio). The modulated signals from neighbor cells simply appear as noise. This
effect is simulated by adding AWGN to the signal.
The internal fading module supports AWGN insertion with configurable noise level.
Insertion loss at the baseband level is calculated and compensated automatically at
the HF.
The properties of the AWGN interferer comply with the requirements of 3GPP TS
34.122, section 7.1.2 (minimum bandwidth 1.92 MHz, flatness less than ±0.5 dB, peak
to average ratio at a probability of 0.001 % above 10 dB). It is needed for many of the
performance tests described in 3GPP TS 34.122.
AWGN insertion via the signaling unit is disabled for fading scenarios (see "RF Power
Downlink > AWGN" on page 88).
2.2.7 Connection States
The UMTS core network consists of two service domains, the Circuit Switched (CS)
and the Packet Switched (PS) domain. You can set up a connection in the CS domain
or a connection in the PS domain. For supported connection types see Chapter 2.2.11,
"Connection Types", on page 32.
The connection schemes for the CS domain and the PS domain are independent from
each other. The downlink signal generated by the R&S CMW can emulate a UTRAN
TDD cell supporting both CS and PS services, or a UTRAN TDD cell supporting CS
services only.
2.2.7.1 CS Connection States
The main CS connection states are described in the following table.
CS State Description
Off No signal transmission / no connection to the UE
On The R&S CMW emulates a UTRAN cell, transmitting a TD-SCDMA signal to which the UE
can synchronize. After synchronization the UE can initiate a registration towards the
instrument, and the instrument can page the UE in order to attempt a connection.
Registered Synchronization and registration have been performed.
General Description
深圳德标仪器 135-1095-0799

TD-SCDMA Signaling
R&S®CMW-KM75x/-KS75x/-KS76x
20User Manual 1173.9670.02 ─ 18
CS State Description
Alerting The R&S CMW is attempting a connection to the UE. The UE is responding (ringing) but
the connection is not yet established.
This state is skipped for Connection Type = Test Mode.
Call Estab-
lished
A Radio Resource Control (RRC) connection between the instrument and the UE has
been established. This means that dedicated channels are allocated between the
R&S CMW and the UE. Depending on the Radio Access Bearer (RAB) configuration, the
dedicated channel can consist of the Signaling Radio Bearer (SRB) used to set up the
connection or other RABs, e.g. a Reference Measurement Channel (RMC) or voice chan-
nel (AMR).
Control commands, initiated by the R&S CMW or by the UE, switch between the listed
states. The following figure shows possible state transitions.
Figure 2-2: Connection states CS domain
dotted line = action initiated by instrument
dashed line = action initiated by UE
solid line = action initiated by UE or instrument
General Description
深圳德标仪器 135-1095-0799