Rohde&Schwarz SMW200A User manual

Cellular IoT eMTC and NB-IoT

R&S®SMW-K115/-K143/-K146/-

K175/-K69

User Manual

1178430102

Version 18

(;Ü[12)

This document describes the following software options:

●R&S®SMW-K69, LTE closed-loop BS test (1413.4480.xx)

●R&S®SMW-K115, Cellular IoT eMTC and NB-IoT Rel. 13 (1414.2723.xx)

●R&S®SMW-K143, Cellular IoT eMTC and NB-IoT Rel. 14 (1414.6064.xx)

●R&S®SMW-K146, Cellular IoT eMTC and NB-IoT Rel. 15 (1414.6564.xx)

●R&S®SMW-K175, U-plane data generation (1413.3261.xx)

This manual describes firmware version FW 5.20.043.xx and later of the R&S®SMW200A.

Muehldorfstr. 15, 81671 Muenchen, Germany

Phone: +49 89 41 29 - 0

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.

1178.4301.02 | Version 18 | Cellular IoT eMTC and NB-IoT

The following abbreviations are used throughout this manual: R&S®SMW200A is abbreviated as R&S SMW, R&S®WinIQSIM2 is

abbreviated as R&S WinIQSIM2; the license types 02/03/07/11/13/16/12 are abbreviated as xx.

ContentsCellular IoT eMTC and NB-IoT

3User Manual 1178.4301.02 ─ 18

Contents

1 Welcome to the cellular IoT option.....................................................11

1.1 Key features.................................................................................................................11

1.2 What's new...................................................................................................................12

1.3 Accessing the eMTC/NB-IoT dialog...........................................................................12

1.4 Documentation overview............................................................................................13

1.4.1 Getting started manual..................................................................................................13

1.4.2 User manuals and help................................................................................................. 13

1.4.3 Tutorials.........................................................................................................................13

1.4.4 Service manual............................................................................................................. 13

1.4.5 Instrument security procedures.....................................................................................14

1.4.6 Printed safety instructions............................................................................................. 14

1.4.7 Data sheets and brochures........................................................................................... 14

1.4.8 Release notes and open source acknowledgment (OSA)............................................ 14

1.4.9 Application notes, application cards, white papers, etc.................................................14

1.4.10 Videos........................................................................................................................... 14

1.5 Scope........................................................................................................................... 15

1.6 Notes on screenshots.................................................................................................15

2 About the internet of things (IoT)....................................................... 16

2.1 Required options.........................................................................................................17

2.2 About eMTC................................................................................................................. 18

2.2.1 Physical layer................................................................................................................ 19

2.2.2 PBCH............................................................................................................................ 21

2.2.3 PDSCH..........................................................................................................................21

2.2.4 MPDCCH...................................................................................................................... 25

2.2.5 PUSCH..........................................................................................................................29

2.2.6 PUCCH......................................................................................................................... 32

2.2.7 PRACH..........................................................................................................................33

2.3 About NB-IoT............................................................................................................... 34

2.3.1 Physical layer................................................................................................................ 35

2.3.2 NPSS and NSSS...........................................................................................................38

2.3.3 NRS...............................................................................................................................39

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2.3.4 NPBCH..........................................................................................................................40

2.3.5 NPDCCH.......................................................................................................................41

2.3.6 NPDSCH....................................................................................................................... 45

2.3.7 NDRS............................................................................................................................ 47

2.3.8 NPUSCH....................................................................................................................... 48

2.3.9 NPRACH....................................................................................................................... 51

3 eMTC / NB-IoT configuration and settings........................................ 55

3.1 Configuring the general IoT settings........................................................................ 56

3.2 DL physical layer settings..........................................................................................62

3.3 DL user configuration.................................................................................................69

3.4 NB-IoT carrier allocation............................................................................................ 72

3.5 NB-IoT downlink reference and synchronization signals structure.......................79

3.6 NB-IoT wake-up signal (NWUS) settings.................................................................. 84

3.7 NPBCH, NPDCCH and NPDSCH settings..................................................................86

3.7.1 Search space settings...................................................................................................88

3.7.2 NB-IoT DCI configuration.............................................................................................. 90

3.7.3 NB-IoT allocations (NPBCH, NPDCCH, NPDSCH).................................................... 104

3.7.4 NPBCH channel coding and MIB-NB configuration.................................................... 109

3.7.5 NPDSCH and NPDCCH channel coding and scrambling........................................... 113

3.8 eMTC DL valid subframes and frequency hopping................................................116

3.9 eMTC synchronization and cell-specific reference signals (CRS/SYNC) settings

.................................................................................................................................... 120

3.10 eMTC DL allocations settings.................................................................................. 122

3.10.1 Search space settings.................................................................................................125

3.10.2 MPDCCH configuration...............................................................................................127

3.10.3 eMTC DCI configuration..............................................................................................130

3.10.4 eMTC allocations (PBCH, MPDCCH, PDSCH)...........................................................142

3.10.5 PBCH channel coding and SIB-BR configuration....................................................... 146

3.10.6 PDSCH channel coding and scrambling..................................................................... 149

3.11 eMTC DL antenna port mapping settings............................................................... 154

3.12 UL physical layer settings........................................................................................160

3.13 UE settings common to all UL channels and signals............................................168

3.14 FRC settings.............................................................................................................. 170

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3.15 NPUSCH settings...................................................................................................... 172

3.15.1 NB-IoT allocation settings........................................................................................... 175

3.15.2 NPUSCH enhanced settings.......................................................................................180

3.16 NDMRS settings........................................................................................................ 184

3.17 NPRACH settings...................................................................................................... 186

3.18 eMTC PUSCH settings.............................................................................................. 192

3.18.1 Cell-specific eMTC PUSCH settings........................................................................... 193

3.18.2 UE-specific eMTC PUSCH transmissions settings..................................................... 194

3.18.3 eMTC PUSCH channel coding and multiplexing settings........................................... 200

3.19 eMTC PUCCH settings..............................................................................................205

3.19.1 Cell-specific eMTC PUCCH settings...........................................................................206

3.19.2 UE-specific eMTC PUCCH settings............................................................................ 208

3.19.3 eMTC PUCCH channel coding and multiplexing settings........................................... 208

3.20 eMTC PRACH settings..............................................................................................210

3.21 eMTC PUSCH/NPUSCH UE-specific settings......................................................... 215

3.22 eMTC reference signals and SRS settings............................................................. 218

3.22.1 UL reference signals................................................................................................... 220

3.22.2 Cell-specific SRS settings........................................................................................... 221

3.22.3 UE-specific eMTC DMRS settings.............................................................................. 223

3.22.4 UE-specific eMTC SRS settings................................................................................. 224

3.23 Find out the implemented 3GPP specification.......................................................231

4 Real-time feedback for eMTC/NB-IoT testing.................................. 232

4.1 Feedback modes....................................................................................................... 232

4.1.1 Serial modes............................................................................................................... 233

4.1.2 Structure of a serial and 3x8 serial feedback command............................................. 234

4.2 Feedback timing for eMTC/NB-IoT tests................................................................. 235

4.3 Real-time feedback configuration settings.............................................................236

5 Observing current allocations on the time plan..............................240

5.1 eMTC/NB-IoT indication in the DL time plan...........................................................240

5.2 eMTC/NB-IoT indication in the UL time plan...........................................................242

5.3 TDD time plan............................................................................................................ 244

6 Performing BS tests according to TS 36.141.................................. 247

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6.1 Introduction to conformance testing...................................................................... 247

6.1.1 UE conformance testing..............................................................................................247

6.1.2 BS conformance testing.............................................................................................. 249

6.1.3 Repeater conformance testing.................................................................................... 249

6.2 Required options.......................................................................................................249

6.3 Supported test cases................................................................................................250

6.3.1 Generic structure of the description of the implemented test cases........................... 252

6.4 Standard test setups.................................................................................................252

6.4.1 Standard test setup - one path....................................................................................252

6.4.2 Standard test setup - two paths.................................................................................. 253

6.4.3 Test setup - diversity measurements...........................................................................254

6.4.4 Test setup - four RX antennas.....................................................................................254

6.5 General considerations............................................................................................ 255

6.6 User interface............................................................................................................ 259

6.6.1 Test case settings........................................................................................................259

6.6.2 Instrument settings......................................................................................................260

6.6.3 Frequency allocation settings......................................................................................262

6.6.4 Wanted signal and cell-specific settings......................................................................263

6.6.5 Diagram.......................................................................................................................265

6.6.6 Apply settings..............................................................................................................266

6.7 Transmitter characteristics (TS 36.141, chapter 6)................................................ 266

6.7.1 Required options......................................................................................................... 267

6.7.2 Prior considerations.................................................................................................... 267

6.7.3 Introduction to the unwanted emissions tests............................................................. 267

6.7.4 General workflow for carrying out a transmitter test....................................................269

6.7.5 Interfering signal settings............................................................................................ 271

6.7.6 Test case 6.7: transmitter intermodulation.................................................................. 273

6.8 Receiver characteristics (TS 36.141, chapter 7).....................................................274

6.8.1 Required options......................................................................................................... 275

6.8.2 Prior considerations.................................................................................................... 276

6.8.3 General workflow for carrying out a receiver test........................................................277

6.8.4 Interfering signal settings............................................................................................ 278

6.8.5 Test case 7.2: reference sensitivity level.....................................................................282

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6.8.6 Test case 7.3: dynamic range..................................................................................... 283

6.8.7 Test case 7.4: in-channel selectivity (ICS).................................................................. 285

6.8.8 Test case 7.5A: adjacent channel selectivity (ACS)....................................................288

6.8.9 Test case 7.5B: narrow-band blocking........................................................................ 290

6.8.10 Test case 7.6: blocking................................................................................................293

6.8.11 Test case 7.8: receiver intermodulation.......................................................................296

6.9 Performance requirements (TS 36.141, chapter 8)................................................ 299

6.9.1 Required options......................................................................................................... 300

6.9.2 Prior considerations.................................................................................................... 302

6.9.3 Realtime feedback configuration, AWGN and propagation condition settings............ 304

6.9.4 Test case 8.2.1: PUSCH in multipath fading propagation conditions..........................306

6.9.5 Test case 8.2.2: UL timing adjustment........................................................................ 308

6.9.6 Test case 8.2.3: HARQ-ACK multiplexed on PUSCH................................................. 313

6.9.7 Test case 8.2.4: high-speed train conditions...............................................................315

6.9.8 Test case 8.3.1: ACK missed detection for single user PUCCH format 1a................. 319

6.9.9 Test case 8.3.2: CQI performance requirements for PUCCH format 2....................... 321

6.9.10 Test case 8.3.3: ACK missed detection for multi-user PUCCH format 1a...................323

6.9.11 Test case 8.3.4: ACK missed detection for PUCCH format 1b, channel selection......327

6.9.12 Test case 8.3.5: ACK missed detection for PUCCH format 3..................................... 329

6.9.13 Test case 8.3.6: NACK to ACK detection for PUCCH format 3...................................332

6.9.14 Test case 8.3.7: ACK missed detection for PUCCH format 1a transmission on two

antenna ports.............................................................................................................. 334

6.9.15 Test case 8.3.8: CQI performance requirements for PUCCH format 2 transmission on

two antenna ports........................................................................................................336

6.9.16 Test case 8.3.9: CQI performance for PUCCH format 2 with DTX detection..............337

6.9.17 Test case 8.4.1: PRACH false alarm probability and missed detection...................... 340

6.9.18 Test case 8.5.1: performance requirements for NPUSCH.......................................... 343

6.9.19 Test case 8.5.2: ACK missed detection for NPUSCH format 2...................................345

6.9.20 Test case 8.5.3: performance requirements for NPRACH.......................................... 347

7 Generating user plane data...............................................................349

7.1 Required options.......................................................................................................349

7.2 File format and folder structure...............................................................................349

8 Signal control and signal characteristics........................................351

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8.1 Time domain windowing settings............................................................................351

8.2 Filter/clipping/ARB settings..................................................................................... 352

8.2.1 Filter settings...............................................................................................................352

8.2.2 Clipping settings..........................................................................................................358

8.2.3 ARB settings............................................................................................................... 359

8.3 Adjusting the signal power...................................................................................... 361

8.3.1 General power-related settings overview....................................................................361

8.3.2 Downlink power-related settings overview.................................................................. 361

8.3.3 Uplink power-related settings overview.......................................................................362

8.3.4 Power settings.............................................................................................................362

8.4 Trigger settings......................................................................................................... 365

8.5 Marker settings..........................................................................................................370

8.6 Clock settings............................................................................................................373

8.7 Local and global connectors settings.....................................................................375

9 Remote-Control commands.............................................................. 376

9.1 Programming examples........................................................................................... 377

9.2 General commands...................................................................................................400

9.3 General downlink...................................................................................................... 405

9.3.1 Physical settings......................................................................................................... 406

9.3.2 Reference and synchronization signals...................................................................... 414

9.3.3 NPRS.......................................................................................................................... 416

9.3.4 NB-IoT wake-up signal................................................................................................420

9.3.5 NB-IoT carrier allocation............................................................................................. 422

9.3.6 eMTC bitmap, valid subframes, hopping and common search space........................ 429

9.4 DL frame configuration.............................................................................................434

9.4.1 NB-IoT DCI configuration............................................................................................ 434

9.4.2 NB-IoT allocation.........................................................................................................445

9.4.3 NPBCH, NPDCCH, NPDSCH enhanced settings.......................................................449

9.4.4 eMTC DCI configuration..............................................................................................454

9.4.5 eMTC allocations........................................................................................................ 467

9.4.6 PBCH and PDSCH enhanced settings....................................................................... 472

9.4.7 MPDCCH configuration...............................................................................................481

9.5 User configuration.................................................................................................... 485

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9.6 General uplink........................................................................................................... 492

9.7 UL frame configuration.............................................................................................511

9.8 UE configuration....................................................................................................... 512

9.8.1 Common......................................................................................................................512

9.8.2 SRS.............................................................................................................................518

9.8.3 NB-IoT NPUSCH allocation........................................................................................ 523

9.8.4 NB-IoT NPUSCH enhanced settings.......................................................................... 529

9.8.5 FRC.............................................................................................................................533

9.8.6 NPRACH..................................................................................................................... 536

9.8.7 eMTC PUSCH and PUCCH allocations...................................................................... 538

9.8.8 eMTC PUSCH and PUCCH enhanced settings..........................................................543

9.8.9 eMTC PRACH.............................................................................................................549

9.9 Filter settings.............................................................................................................552

9.10 Clipping settings....................................................................................................... 556

9.11 ARB settings..............................................................................................................558

9.12 Time domain windowing settings............................................................................559

9.13 Power settings...........................................................................................................560

9.14 Clock.......................................................................................................................... 562

9.15 Timing configuration.................................................................................................563

9.16 Trigger........................................................................................................................ 564

9.17 Marker........................................................................................................................ 571

9.18 Realtime feedback.....................................................................................................573

9.19 Test case wizard remote-control commands..........................................................576

Annex.................................................................................................. 598

A Overview of EUTRA/LTE concepts reused by eMTC/NB-IoT......... 598

Glossary: 3GPP specifications, references.....................................603

List of commands.............................................................................. 604

Index....................................................................................................618

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Welcome to the cellular IoT optionCellular IoT eMTC and NB-IoT

11User Manual 1178.4301.02 ─ 18

1 Welcome to the cellular IoT option

The R&S SMW-K115/143/-K146 are a firmware application that adds functionality to

generate signals in accordance with the 3GPP specifications.

1.1 Key features

If option R&S SMW-K143 is installed, the eMTC and NB-IoT features are in line with

3GPP Release 15. The following official 3GPP specifications are implemented:

●3GPP TS 36.211, version 15.6.0

●3GPP TS 36.212, version 15.6.0

●3GPP TS 36.213, version 15.6.0

The R&S SMW-K115 key features

The R&S SMW simulates eMTC and NB-IoT at the physical channel level. The follow-

ing is an overview of provided functions:

●Supports uplink eMTC and NB-IoT configuration, as well as downlink NB-IoT con-

figuration

●Supports IoT standalone configuration and mixed configuration with LTE

●Supports NB-IoT in-band and guard band opiating modes, incl. suppression of LTE

channels in in-band operating

●Intuitive user interface with graphical display of time plan

●Support of coverage enhancement CE modes A and B and CE levels 0 to 3

●Support of the new NB channels and synchronization signals (NPSS, NSSS and

DL reference signal derived from NCell ID)

●Support of PBCH (including SIB type 1), PDSCH and the new eMTC channel

MPDCCH

●DCI-based configuration of NPDCCH/NPDSCH and MPDCCH/PDSCH

●Channel coding and scrambling for NPDCCH, NPDSCH and NPBCH (including

SIB type 1)

●Supports NPUSCH with channel coding and scrambling

●NPRACH configuration

●Manual NPUSCH scheduling

●Support of all specified modulation schemes

The R&S SMW-K143 key features

This option extends the R&S SMW-K115 with 3GPP Rel. 14 features:

●Supports uplink eMTC wideband operation, incl. configuration of the retuning sym-

bols

●Supports downlink eMTC wideband operation

●Support of eMTC SRS configuration

Key features

Welcome to the cellular IoT optionCellular IoT eMTC and NB-IoT

12User Manual 1178.4301.02 ─ 18

●DCI format N0 and N1 extended to support the Rel. 14 fields

●Support of extended transport block sizes and PUCCH/PUSCH repetitions.

The R&S SMW-K146 key features

This option extends the R&S SMW-K115 with 3GPP Rel. 15 features:

●Supports uplink NB-IoT operation in TDD mode, incl. NPUSCH

●Supports FDD NPRACH formats

●Supports NB-IoT wake up signal

●Supports early data transmission in uplink

●Supports scheduling request in uplink for NPUSCH format 2

This user manual contains a description of the functionality that the application pro-

vides, including remote control operation.

All functions not discussed in this manual are the same as in the base unit and are

described in the R&S SMW user manual. The latest version is available at:

www.rohde-schwarz.com/manual/SMW200A

Installation

You can find detailed installation instructions in the delivery of the option or in the

R&S SMW service manual.

1.2 What's new

This manual describes firmware version FW 5.20.043.xx and later of the

R&S®SMW200A.

Compared to the previous version 5.10.035, the cellular IoT eMTC and NB-IoT firm-

ware application provides the following new features and changes:

●ARB sequence length supported also in subframes, see "(Current) Sequence

Length" on page 359

1.3 Accessing the eMTC/NB-IoT dialog

To open the dialog with eMTC/NB-IoT settings

1. In the block diagram of the R&S SMW, select "Baseband > EUTRA/LTE/IoT".

2. In the "General" tab, select "Mode > eMTC/NB-IoT or LTE/eMTC/NB-IoT"

A dialog box opens that display the provided general settings.

The signal generation is not started immediately. To start signal generation with the

default settings, select "State > On".

Accessing the eMTC/NB-IoT dialog

Welcome to the cellular IoT optionCellular IoT eMTC and NB-IoT

13User Manual 1178.4301.02 ─ 18

1.4 Documentation overview

This section provides an overview of the R&S SMW user documentation. Unless speci-

fied otherwise, you find the documents at:

www.rohde-schwarz.com/manual/smw200a

1.4.1 Getting started manual

Introduces the R&S SMW and describes how to set up and start working with the prod-

uct. Includes basic operations, typical measurement examples, and general informa-

tion, e.g. safety instructions, etc. A printed version is delivered with the instrument.

1.4.2 User manuals and help

Separate manuals for the base unit and the software options are provided for down-

load:

●Base unit manual

Contains the description of all instrument modes and functions. It also provides an

introduction to remote control, a complete description of the remote control com-

mands with programming examples, and information on maintenance, instrument

interfaces and error messages. Includes the contents of the getting started manual.

●Software option manual

Contains the description of the specific functions of an option. Basic information on

operating the R&S SMW is not included.

The contents of the user manuals are available as help in the R&S SMW. The help

offers quick, context-sensitive access to the complete information for the base unit and

the software options.

All user manuals are also available for download or for immediate display on the Inter-

net.

1.4.3 Tutorials

The R&S SMW provides interactive examples and demonstrations on operating the

instrument in form of tutorials. A set of tutorials is available directly on the instrument.

1.4.4 Service manual

Describes the performance test for checking compliance with rated specifications, firm-

ware update, troubleshooting, adjustments, installing options and maintenance.

The service manual is available for registered users on the global Rohde & Schwarz

information system (GLORIS):

https://gloris.rohde-schwarz.com

Documentation overview

Welcome to the cellular IoT optionCellular IoT eMTC and NB-IoT

14User Manual 1178.4301.02 ─ 18

1.4.5 Instrument security procedures

Deals with security issues when working with the R&S SMW in secure areas. It is avail-

able for download on the internet.

1.4.6 Printed safety instructions

Provides safety information in many languages. The printed document is delivered with

the product.

1.4.7 Data sheets and brochures

The data sheet contains the technical specifications of the R&S SMW. It also lists the

options and their order numbers and optional accessories.

The brochure provides an overview of the instrument and deals with the specific char-

acteristics.

See www.rohde-schwarz.com/brochure-datasheet/smw200a

1.4.8 Release notes and open source acknowledgment (OSA)

The release notes list new features, improvements and known issues of the current

firmware version, and describe the firmware installation.

The software makes use of several valuable open source software packages. An open-

source acknowledgment document provides verbatim license texts of the used open

source software.

See www.rohde-schwarz.com/firmware/smw200a

1.4.9 Application notes, application cards, white papers, etc.

These documents deal with special applications or background information on particu-

lar topics.

See www.rohde-schwarz.com/application/smw200a and www.rohde-schwarz.com/

manual/smw200a

1.4.10 Videos

Find various videos on Rohde & Schwarz products and test and measurement topics

on YouTube: https://www.youtube.com/@RohdeundSchwarz

Documentation overview

Welcome to the cellular IoT optionCellular IoT eMTC and NB-IoT

15User Manual 1178.4301.02 ─ 18

On the menu bar, search for your product to find related videos.

Figure 1-1: Product search on YouTube

1.5 Scope

Tasks (in manual or remote operation) that are also performed in the base unit in the

same way are not described here.

In particular, it includes:

●Managing settings and data lists, like saving and loading settings, creating and

accessing data lists, or accessing files in a particular directory.

●Information on regular trigger, marker and clock signals and filter settings, if appro-

priate.

●General instrument configuration, such as checking the system configuration, con-

figuring networks and remote operation

●Using the common status registers

For a description of such tasks, see the R&S SMW user manual.

1.6 Notes on screenshots

When describing the functions of the product, we use sample screenshots. These

screenshots are meant to illustrate as many as possible of the provided functions and

possible interdependencies between parameters. The shown values may not represent

realistic usage scenarios.

The screenshots usually show a fully equipped product, that is: with all options instal-

led. Thus, some functions shown in the screenshots may not be available in your par-

ticular product configuration.

Notes on screenshots

About the internet of things (IoT)Cellular IoT eMTC and NB-IoT

16User Manual 1178.4301.02 ─ 18

2 About the internet of things (IoT)

The introduction of mobile communications extended the variety and the requirements

on the way machines communicate with each other. The machine communication is

known as machine type communication (MTC), the machine to machine communica-

tion (M2M) or the Internet of things (IoT).

Related 3GPP specifications

Because LTE was primarily optimized for the mobile broadband market, the specifica-

tions had to be extended to cover possible MTC solution. The following specifications

specify IoT related features:

●3GPP LTE Rel. 12 (MTC)

First MTC specification, based on the existing LTE standard. Introduces new type

CAT0 devices

●3GPP LTE Rel. 13 (eMTC or LTE-M)

Further development of MTC to eMTC (enhanced MTC). Introduces new type CAT-

M1 devices.

●3GPP LTE Rel. 13 (NB-IoT)

First dedicated IoT specification, regarded as new radio access technology.

Introduces new type CAT-NB1 devices.

●3GPP LTE Rel. 14 (eMTC and NB-IoT)

Introduces eMTC widebands and new types CAT-M2 and CAT-NB2 devices.

●3GPP LTE Rel. 15 (NB-IoT)

Introduces NB-IoT TDD mode in UL, FDD NPRACH formats, early data transmis-

sion, NB-IoT wake up signal and scheduling request in uplink for NPUSCH F2.

●3GPP GERAN (EC-GSM)

Extension in the GSM standard

Overview of the main characteristics

eMTC (LTE-M) NB-IoT

Based on existing LTE standard new radio access technology

UE category CAT0

CAT-M1

CAT-M2

CAT-NB1

CAT-NB2

Channel bandwidth 1.4 MHz 180 KHz

Number of RB 6 1

Coverage extension (CE) CE mode A and CE mode B CE level 0, CE level 1 and CE

level 2

LTE features not supported by eMTC or NB-IoT

Consider the following differences between eMTC and LTE/LTE-A.

●eMTC does not support:

About the internet of things (IoT)Cellular IoT eMTC and NB-IoT

17User Manual 1178.4301.02 ─ 18

– Spatial multiplexing

– Simultaneous PUCCH/PUSCH

– Higher-order modulation schemes

– CSI feedback

– Transmission modes 3, 4, 8 and 10

– PUCCH format 3, 4 and 5

– ACK/NACK bundling multiplexing in TDD

●eMTC supports:

– 2 HARQ processes

– Contiguous resource allocations for UL and DL

●Among other, NB-IoT does not support:

– Carrier aggregation

– Home eNB, closed subscriber group (CSG)

– Relaying

– Dual connectivity

– MBMS/eMBMS

Scope of this description

This section gives a brief description of the LTE Rel. 13 and somer Rel. 14 features

that are related to the eMTC and NB-IoT technology. The following section list the sub-

set of features that are covered by the software option R&S SMW-K115/-K143:

●Chapter 2.2, "About eMTC", on page 18

●Chapter 2.3, "About NB-IoT", on page 34

For an insight description of the NB-IoT features, refer to:

●White Paper 1MA266 "Narrowband Internet of Things"

●Application Note 1MA296 "Narrowband Internet of Things Measurements"

2.1 Required options

The basic equipment layout for generating eMTC/NB-IoT signals includes the options:

●Standard or wideband Baseband Generator (R&S SMW-B10/-B9)

●Baseband Main Module (R&S SMW-B13) or Wideband baseband main module

(R&S SMW-B13XT)

●Option cellular IoT release 13 (R&S SMW-K115)

●Optional, option cellular IoT release 14 (R&S SMW-K143)

●Optional, option cellular IoT release 15 (R&S SMW-K146)

●Frequency option (e.g. R&S SMW-B1003)

●Optional, option logfile generation (R&S SMW-K81)

●Optional, option LTE closed loop BS test (R&S SMW-K69)

Required options

About the internet of things (IoT)Cellular IoT eMTC and NB-IoT

18User Manual 1178.4301.02 ─ 18

You can generate signals via play-back of waveform files at the signal generator. To

create the waveform file using R&S WinIQSIM2, you do not need a specific option.

To play back the waveform file at the signal generator, you have two options:

●Install the R&S WinIQSIM2 option of the digital standard, e.g. R&S SMW-K255 for

playing LTE waveforms

●If supported, install the real-time option of the digital standard, e.g. R&S SMW-K55

for playing LTE waveforms

For more information, see data sheet.

2.2 About eMTC

Short summary

eMTC is an extension of the LTE standard.

eMTC main characteristics are:

●Channel bandwidth splitting into narrowbands

Min channel bandwidth is a narrowband with 1.4 MHz or 6 RBs. 16 narrowbands

can be allocated within the 20 MHz channel bandwidth.

●Four non-overlapping consequent narrowbands can be grouped into wideband with

5 MHz carrier bandwidth or 24 RBs

●Two coverage extension (CE) modes: CEModeA and CEModeB

Coverage extension modes

CE mode CE level Description Optional/mandatory

CEModeA 0, 1 Supports small number of PUSCH or

PUCCH repetitions

Mandatory in eMTC Rel. 13

CEModeB 2, 3 Enables large number of PUSCH or PUCCH

repetitions

Optional in eMTC Rel. 13

Overview of the physical signals and channels

Because eMTC is an extension of the LTE standard, it reuses the LTE concept, includ-

ing reference signals and channels. eMTC, however, does not support MIMO and

MBFSN.

eMTC uses the following signals and channels:

●UL reference signals: SRS, DMRS

●DL physical channels:

PDSCH, PBCH, PDCCH, and the new MPDCCH (MTC physical downlink control

channel)

●UL physical channels:

PUSCH (modulation QPSK, 16QAM, 64QAM), PUCCH, PRACH

About eMTC

About the internet of things (IoT)Cellular IoT eMTC and NB-IoT

19User Manual 1178.4301.02 ─ 18

See:

–Chapter 2.2.5, "PUSCH", on page 29

–Chapter 2.2.6, "PUCCH", on page 32

–Chapter 2.2.7, "PRACH", on page 33

Guard period for narrowband and wideband retunning

According to TS 36.211, an eMTC transmission cannot switch the used narrowband/

wideband immediately but it needs time to retune to the new frequency. This retuning

time is referred as guard time and is defined as number of unused symbols depending

on the channel type and the link direction. In any of the combinations, two symbols are

left unused, see the illustrations in Table 2-1.

Table 2-1: Symbols used as guard period for retuning

Link direction Transition Visualization on the "Time Plan"

UL PUSCH-to-PUSCH

PUCCH-to-PUCCH

PUCCH-to-PUSCH

PUSCH-to-PUCCH

Related settings

●"Retuning Symbols" on page 167

2.2.1 Physical layer

Narrowbands

In eMTC, a narrowband is defined as a set of six non-overlapping consecutive physical

resource blocks in the frequency domain. The number of narrowbands NNB is calcula-

ted as follows:

NNB = NRB / 6, where NRB is the number of the available resource blocks.

About eMTC

About the internet of things (IoT)Cellular IoT eMTC and NB-IoT

20User Manual 1178.4301.02 ─ 18

Figure 2-1: eMTC narrowbands

NB# = Narrowband number

RB = Resource block number

1 = "Channel Bandwidth = 1.4 MHz", NRB = 6, NNB = 1

2 = "Channel Bandwidth = 3 MHz", NRB = 15, NNB = 2

3 = "Channel Bandwidth = 5 MHz", NRB = 25, NNB = 4

4 = "Channel Bandwidth = 10 MHz", NRB = 50, NNB = 8

White RB = Not allocated RBs

eMTC transmission is always subframe-wise. That is, the smallest resource that can

be allocated is 1 RB and one subframe.

Related settings

●Chapter 3.8, "eMTC DL valid subframes and frequency hopping", on page 116

●"Number of eMTC Narrowbands" on page 163

●"Valid Subframes" on page 167

Widebands

Four non-overlapping consequent narrowbands can be grouped into wideband with 5

MHz carrier bandwidth or 24 RBs. If the number of narrowband NNB ≥ 4, the number of

widebands NWB is calculated as follows:

NWB = NNB / 4, where NRB is the number of the available resource blocks.

If the number of narrowband NNB < 4, all available resource blocks are allocated to the

same wideband.

Related settings

●"Wideband Config" on page 164

●"Number of eMTC Widebands" on page 163

About eMTC

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