Agilent technologies PXT E6621A User Manual
Agilent PXT Wireless
Communications Test Set
(E6621A)
User’s Guide
Notices
© Agilent Technologies, Inc. 2010-2013
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Manual Part Number
E6621-90002
Edition
May 2013
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This instrument has an auto-ranging
line voltage input, ensure the supply
voltage is within the specified range.
i
product is likely to make the product dangerous. Intentional interruption is prohibited.
electrical shock do not remove covers.
same type and ratings. The use of other fuses, circuit breakers or materials is prohibited.
This product is designed for use in Installation Category II and Pollution Degree 2, per IEC
An active N6050AS software and technical support contract (STSC) is required to access the
WARNING
WARNING
WARNING
CAUTION
CAUTION
This is a Safety Class 1 Product (provided with a protective earthing ground incorporated in
the power cord). The mains plug shall only be inserted in a socket outlet provided with a
protective earth contact. Any interruption of the protective conductor inside or outside of the
No operator serviceable parts inside. Refer servicing to qualified personnel. To prevent
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61010 Second Edition and 664 respectively.
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Where to Find the Latest Information
Agilent will periodically update product documentation. For the latest information about this wireless test set, including
software upgrades, operating and application information, and product and accessory information, see the following
URL: http://www.agilent.com/find/pxt
Is your product software up-to-date?
Agilent will periodically release software updates to fix known defects and incorporate product enhancements. To
search for software updates for your product, go to the Agilent Technical Support website at
http://www.agilent.com/find/softwaremanager
software manager website (displayed above), together with the login credentials registered
by you or your company for activation. See the “Redeem Your Entitlement Certificate”
section in the Agilent PXT Wireless Communications Test Set Getting Started Guide for
instructions to activate your STSC.
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This page is intentionally left blank.
iii
Table of Contents
1 Introduction ............................................................................................................................................ 1
Agilent E6621A PXT Overview ................................................................................................................................... 1
Base Station Emulator (BSE) ................................................................................................................................. 1
Signal Analyzer (SA) ............................................................................................................................................... 1
General Capabilities of the Agilent E6621A PXT ................................................................................................ 2
General Specifications ............................................................................................................................................ 2
PXT Software Applications ......................................................................................................................................... 3
Agilent N6050A LTE Mobile Test Software ........................................................................................................ 3
Agilent N6051A LTE RF Parametric Test with Test Mode Signaling .............................................................. 3
Agilent N6052A LTE Functional and Application Test ...................................................................................... 3
Agilent N6061A Protocol Logging and Analysis ................................................................................................ 4
Agilent N6062A Protocol Message Editor ........................................................................................................... 4
Latest Documentation ................................................................................................................................................. 4
Latest Software Application Release ........................................................................................................................ 4
Software and Technical Support Contracts ............................................................................................................. 4
STSCs for the Agilent E6621A PXT....................................................................................................................... 4
2 Front-panel and Menu Keys ................................................................................................................. 5
Amp ................................................................................................................................................................................. 6
Amplitude .................................................................................................................................................................. 6
RF1 Amplitude .......................................................................................................................................................... 7
RF2 Amplitude .......................................................................................................................................................... 7
RF1 Amplitude (RSTP)............................................................................................................................................. 8
RF2 Amplitude (RSTP)............................................................................................................................................. 8
AWGN ........................................................................................................................................................................ 9
Atten – Key Menu 1 ................................................................................................................................................... 12
Ref Level .................................................................................................................................................................. 12
RF1 Ref Level .......................................................................................................................................................... 13
RF2 Ref Level .......................................................................................................................................................... 13
Attenuation ............................................................................................................................................................. 13
RF1 Input Attenuation ........................................................................................................................................... 15
RF2 Input Attenuation ........................................................................................................................................... 15
Atten – Key Menu 2 ................................................................................................................................................... 16
Scale/Div ................................................................................................................................................................ 16
IDLE_ADJUSTER .................................................................................................................................................... 16
CONNECTED_ADJUSTER..................................................................................................................................... 17
OVF_ADJUSTER ..................................................................................................................................................... 17
BSE ................................................................................................................................................................................ 17
iv
Emulator Mode ....................................................................................................................................................... 17
Config............................................................................................................................................................................ 18
RF Setup .................................................................................................................................................................. 18
Network Setup ....................................................................................................................................................... 21
Cell Setup ................................................................................................................................................................ 24
External Sync .......................................................................................................................................................... 25
Amplitude Offsets .................................................................................................................................................. 27
General Config............................................................................................................................................................. 32
UL Timing Offset Adjustment .............................................................................................................................. 33
Admin ........................................................................................................................................................................... 33
Cont ............................................................................................................................................................................... 33
Freq – Key Menu 1 ..................................................................................................................................................... 33
Setting Method ...................................................................................................................................................... 34
Center (DL) Freq ..................................................................................................................................................... 34
Center (UL) Freq ..................................................................................................................................................... 34
Center (UL/DL) Freq .............................................................................................................................................. 35
Band ......................................................................................................................................................................... 35
DL EARFCN ............................................................................................................................................................. 36
UL EARFCN ............................................................................................................................................................. 37
UL/DL EARFCN ...................................................................................................................................................... 38
Freq – Key Menu 2 ..................................................................................................................................................... 38
Tab Step .................................................................................................................................................................. 38
Func - Key Menu 1 ..................................................................................................................................................... 39
DTCH Test ............................................................................................................................................................... 39
UE Power Control .................................................................................................................................................. 43
Handover ................................................................................................................................................................. 51
UE Detach ............................................................................................................................................................... 53
Paging ...................................................................................................................................................................... 53
Custom Messages ................................................................................................................................................. 54
PDCCH Order .......................................................................................................................................................... 56
OCNG ....................................................................................................................................................................... 57
Func - Key Menu 2 ..................................................................................................................................................... 58
DL Power Control ................................................................................................................................................... 58
RCT ........................................................................................................................................................................... 60
CQI Median ............................................................................................................................................................. 64
Timing Advance ..................................................................................................................................................... 65
Func Setup ................................................................................................................................................................... 67
Trigger ................................................................................................................................
v
...................................... 67
Trigger Output ........................................................................................................................................................ 67
Sweep ...................................................................................................................................................................... 68
Help ............................................................................................................................................................................... 68
Info (System Info) ....................................................................................................................................................... 69
Update Application ................................................................................................................................................ 70
Update License ....................................................................................................................................................... 70
System Temperature ............................................................................................................................................. 70
Local ............................................................................................................................................................................. 70
Management ............................................................................................................................................................... 70
Meas (BSE Mode) ...................................................................................................................................................... 70
Interpreting Display Information ......................................................................................................................... 71
Message .................................................................................................................................................................. 72
L1/L2 Status ........................................................................................................................................................... 73
BLER/Throughput.................................................................................................................................................. 74
Information ............................................................................................................................................................. 76
Channel State Information ................................................................................................................................... 79
RLC Information ..................................................................................................................................................... 81
PDCP Information .................................................................................................................................................. 82
Clear ......................................................................................................................................................................... 82
Meas Setup ................................................................................................................................................................. 83
Average ................................................................................................................................................................... 83
Average Mode ........................................................................................................................................................ 83
Max Hold ................................................................................................................................................................. 83
Edit Interval ............................................................................................................................................................. 83
Display Interval ....................................................................................................................................................... 84
Integ. BW ................................................................................................................................................................ 84
Mode ............................................................................................................................................................................. 84
Mode Setup (BSE Mode)-Key Menu 1 .................................................................................................................... 85
Call Scenario ........................................................................................................................................................... 85
EPC ........................................................................................................................................................................... 85
Control Mode .......................................................................................................................................................... 86
CH Bandwidth ........................................................................................................................................................ 86
C-RNTI ..................................................................................................................................................................... 87
Mode Setup (BSE Mode)-Key Menu 2 .................................................................................................................... 87
PHY Settings ........................................................................................................................................................... 88
MAC Settings ....................................................................................................................................................... 110
RRC Settings – Key Menu 1 ............................................................................................................................... 110
RRC Settings - Key Menu 2 ................................................................................................................................ 113
vi
RRC – Key Menu 3 ............................................................................................................................................... 116
NAS Settings ........................................................................................................................................................ 120
Security – Key Menu 1 ........................................................................................................................................ 130
Security – Key Menu 2 ........................................................................................................................................ 135
Preset ......................................................................................................................................................................... 135
Print............................................................................................................................................................................. 135
Recall .......................................................................................................................................................................... 135
Recall State ........................................................................................................................................................... 135
SA ................................................................................................................................................................................ 136
Spectrum Analyzer .............................................................................................................................................. 136
LTE .......................................................................................................................................................................... 136
Agilent VSA .......................................................................................................................................................... 136
Save ............................................................................................................................................................................ 139
Save State ............................................................................................................................................................. 139
Save Screen Setup .............................................................................................................................................. 139
Save Screen .......................................................................................................................................................... 139
SG ................................................................................................................................................................................ 139
Single .......................................................................................................................................................................... 139
Spectrum .................................................................................................................................................................... 139
Tool ............................................................................................................................................................................. 140
Tech ............................................................................................................................................................................ 140
3 Using the Base Station Emulator Mode (BSE) ............................................................................... 142
Display and Menu Descriptions ............................................................................................................................. 142
Emulator Mode Menu and Display ................................................................................................................... 142
Setup and Operation ................................................................................................................................................ 146
General Call Setup Procedure ............................................................................................................................ 146
Functional Tests and E2E Test .......................................................................................................................... 147
E2E Tests ............................................................................................................................................................... 147
E2E Setup and Benchmarking Guide .................................................................................................................... 149
Typical E2E Test Setup Overview:..................................................................................................................... 149
Example PXT Configuration for Maximum E2E Throughput Testing .......................................................... 150
Driving E2E throughput using Iperf ................................................................................................................... 152
4 Using the Agilent 89600 VSA Software with the PXT ................................................................... 155
Firmware and Software Requirements ................................................................................................................. 155
License Requirements ............................................................................................................................................. 155
Installing the PXT-VSA Communicator software application ........................................................................... 155
Controlling PXT in Live Mode ................................................................................................................................. 156
Controlling PXT in Record Mode............................................................................................................................ 160
5 Handovers ........................................................................................................................................... 163
vii
LTE to LTE Handovers .............................................................................................................................................. 163
Testing Two Cells Using One PXT .................................................................................................................... 165
Blind Handover ..................................................................................................................................................... 169
PXT to PXT Handover .......................................................................................................................................... 173
Inter-Radio Access Technology (I-RAT) Handovers ........................................................................................... 175
UTRAN/LTE & GERAN/LTE Inter-RAT Handovers ........................................................................................ 175
SRVCC (Single Radio Voice Control Continuity) ............................................................................................. 181
SMS over SGs....................................................................................................................................................... 188
6 RF Measurements .............................................................................................................................. 189
Common Measurement Functions ........................................................................................................................ 189
Channel Bandwidth ............................................................................................................................................. 189
Frequency .............................................................................................................................................................. 190
Source Port Setup ................................................................................................................................................ 190
Source Level ......................................................................................................................................................... 191
Receiver Port Setup ............................................................................................................................................. 191
Receiver Level ...................................................................................................................................................... 191
Triggering .............................................................................................................................................................. 192
Averaging .............................................................................................................................................................. 192
Measurement Markers ....................................................................................................................................... 193
Frequency Reference .......................................................................................................................................... 194
RF Measurement Setup ........................................................................................................................................... 194
General Purpose Measurements ...................................................................................................................... 195
Uplink LTE Measurements ...................................................................................................................................... 199
Making Measurements Not Requiring Demodulation .................................................................................. 199
Making Measurements Requiring Demodulation .......................................................................................... 208
7 Tips and Tricks ................................................................................................................................... 223
UE is not connecting. ............................................................................................................................................... 223
No IP Connectivity between PXT Server and UE ................................................................................................ 223
ICMP ping check in both directions ................................................................................................................. 223
EPC enabled and connected .............................................................................................................................. 223
UE Connection Manager Setup ......................................................................................................................... 224
Firewalls ................................................................................................................................................................ 224
Endpoints on the same subnet check .............................................................................................................. 224
Multiple Routes available ................................................................................................................................... 224
PXT BLER observed – E2E throughput affected .................................................................................................. 224
Verify PXT Attenuation is set Correctly ........................................................................................................... 225
Incorrect CFI Used for Channel Bandwidth ..................................................................................................... 225
High EVM observed ............................................................................................................................................. 225
viii
Attempting Cat 4 setup / performance on a Cat 3 device at high end rates ............................................ 225
Faulty RF cable or connectors. .......................................................................................................................... 226
Performance of E2E data is not as expected – high IP packet loss on high end bitrate tests ................... 226
Performance of E2E data is not as expected – TCP performance poor. ......................................................... 226
Bi-directional TCP – Low rate observed ............................................................................................................... 227
E2E data throughput testing for long durations – UE disconnects around 3 hours with DL Subframe#5 set
to MAXTh ................................................................................................................................................................... 227
8 Troubleshooting .................................................................................................................................. 229
Upgrading Your Instrument Software ................................................................................................................... 229
Functional Check ...................................................................................................................................................... 230
Resetting the AC Mains Circuit Breaker .............................................................................................................. 231
Returning Your Test Set for Service ...................................................................................................................... 232
Calling Agilent Technologies ............................................................................................................................. 232
Locations for Agilent Technologies .................................................................................................................. 232
Service and Support ............................................................................................................................................ 233
Software and Technical Support Contracts ......................................................................................................... 234
Web-based support ............................................................................................................................................. 234
E-mail support ...................................................................................................................................................... 234
Phone support ...................................................................................................................................................... 234
9 Appendix A - Message Editor Fields Overwritten by Front-panel Keys ..................................... 235
ix
Agilent PXT Wireless Communications Test Set
User’s Guide
1 Introduction
Welcome to the User’s Guide for the Agilent E6621A PXT Wireless Communications Test Set (PXT). The
purpose of this guide is to provide you with what you need to know after you have finished performing the
setup procedures described in the Getting Started Guide, that you received with your test set. It also
provides key menu descriptions, measurement examples, LTE concepts, and where you can go to get
additional help information.
Your test set will help you meet your stringent time-to-market schedules and design quality goals. From
protocol development through RF conformance and interoperability testing, the PXT is a powerful, scalable
user equipment (UE) test platform. The advanced capabilities of the PXT include real-time, system-rate
network and base station emulation. The test set also provides bench-top network emulation for quick and
easy UE application and performance testing. Downlink MIMO, RF measurements and end-to-end IP data
connections are just a few of the many features that will make your UE development process more
efficient and successful.
This User’s Guide documents all functions available for the instrument. Menu functions which require an
option you have not selected are grayed out.
Agilent E6621A PXT Overview
The Agilent E6621A PXT is designed to test and analyze the performance and signaling of LTE UEs based
on the 3GPP standard. The PXT has two operating modes:
Figure 1-1: Agilent E6621A PXT Wireless Communications Test Set
Base Station Emulator (BSE)
In BSE mode, the PXT simulates the operation of an LTE eNodeB, for use in the development and test of
LTE UEs. In this mode, you can setup a call, establish a link, and transmit data.
Signal Analyzer (SA)
In Signal Analyzer (SA) mode, the PXT can be used to analyze LTE signals using modulation and spectrum
analysis. The Modulation Analysis mode displays the constellation and modulation errors of the signal.
The Spectrum Analysis functionality, implemented using a Fast Fourier Transform (FFT) algorithm, displays
the measured LTE signal in the frequency domain.
1
Agilent PXT Wireless Communications Test Set
Location
Maximum Ambient Temperature
35° C
Table Top
45° C
User’s Guide
General Capabilities of the Agilent E6621A PXT
• Frequency Division Duplex (FDD) and Time Division Duplex (TDD) options
• Real-time 3GPP LTE downlink (DL) signal modulation and uplink (UL) demodulation
• eNodeB simulation with L1, L2 and L3 protocol stack
• Settable eNodeB, UE, and network operation parameters
• Settable frequency, power and modulation schemes
• SISO and MIMO testing capabilities
• Connection to Agilent 89600 VSA software for greater in-depth signal analysis
• VoLTE end-to-end functional voice testing capability
• LTE to LTE Handovers with two PXTs
• LTE to 2G/3G Handovers with PXT and 8960
• Support for Single Radio Voice Call Continuity (SRVCC) with PXT and 8960
General Specifications
Environmental
Operating Temperature:
Rack Mount
Storage Temperature: -20° C to +70° C
Altitude: 2000 meters (maximum)
Humidity: Maximum relative humidity is 80% for temperatures up to 31°C decreasing linearly to 50%
relative humidity at 40°C
This product is designed for indoor use, only.
Physical Specifications
Weight: 27.6 Kg max (depending on product option)
Dimensions: 222 H x 444 W x 600 D mm nominal
2
Power Requirements
dangerous. Intentional interruption is prohibited. (IEC 348 clauses 17.3.3c & 17.3.4)
the specification.
Input Voltage Range: 100 to 240 VAC, automatic selection
Input Frequency Range: 50/60Hz
Input Current Rating: 5A @ 240 VAC (maximum)
7A @ 100 VAC (maximum)
Agilent PXT Wireless Communications Test Set
User’s Guide
WARNING
CAUTION
PXT Software Applications
Agilent N6050A LTE Mobile Test Software
This software application comes installed as a standard product on the PXT. It is the basis for all UE
testing. N6050A-7FP provides LTE-FDD base station emulation and N6050A-8FP provides LTE-TDD base
station emulation.
This is a Safety Class 1 Product (provided with a protective earthing ground
incorporated in the power cord). The mains plug shall only be inserted in a socket
outlet provided with a protective earth contact. Any interruption of the protective
conductor inside or outside of the instrument is likely to make the instrument
This instrument has an auto-ranging line voltage input. Ensure the supply voltage is
within the specified range.
When installing the product in a cabinet the convection into and out of the product
must not be restricted. The ambient temperature (outside the cabinet) must be less
than the maximum operating temperature of the product by 4° C for every 100 watts
dissipated in the cabinet. If the total power dissipated in the cabinet is greater than
800 watts, then forced convection must be used. It is your responsibility to ensure
the ambient temperature does not exceed the rated ambient temperature stated in
Agilent N6051A LTE RF Parametric Test with Test Mode Signaling
This software application is useful for RF design. It is installed in the PXT and includes a suite of LTE RF
measurements that are used for characterization, calibration, and verification purposes, available while on
a connection. This software application is optional.
Agilent N6052A LTE Functional and Application Test
This software application enables the PXT to provide a controlled environment where you can verify
network attach, idle and connected mode operation and functional performance such as throughput.
Maximum flexibility makes it possible for you to configure a range of connection and network parameters
where you can test, stress, and debug the protocol and data handling capabilities of designs including DL
2x2 MIMO and handovers. This software application is optional.
3
Agilent PXT Wireless Communications Test Set
An active N6050AS Software and Technical Support Contract (STSC) is required to access
User’s Guide
Agilent N6061A Protocol Logging and Analysis
This application software is developed for use on systems running the Microsoft (MS) Windows XP or
Windows 7 operating systems. It displays and stores protocol and event logs of Agilent E6621A PXT. The
stored log files can be replayed and analyzed using this software and other advanced post-processing
tools. Please consult the Agilent LTE Protocol Logging and Analysis User’s Guide for more information.
Agilent N6062A Protocol Message Editor
This software application is developed for use on systems running the MS Windows XP or Windows 7
operating systems. The N6062A provides the ability to define RRC/NAS messages and event-driven
scenarios which can be utilized during the Base Station Emulator (BSE) operating mode of the Agilent
E6621A PXT. Please consult the Agilent LTE Message Editor User’s Guide for more information.
Latest Documentation
For the latest documentation on the above products, please go to www.agilent.com/find/pxt.
Latest Software Application Release
For the latest release of all PXT related software, please go to
http://www.agilent.com/find/softwaremanager
installation instructions.
. See “Upgrading Your Instrument Software” for
the software manager website (displayed above), together with the login credentials
registered by you or your company for activation. See the “Redeem Your Entitlement
Certificate” section in the Agilent PXT Wireless Communications Test Set Getting Started
Guide for instructions to activate your STSC.
Software and Technical Support Contracts
Software and Technical Support Contracts (STSC) entitle you to software updates and feature
enhancements, as well as direct access to a technical expert for technical support for a fixed period,
usually one year.
The STSC gives you direct access to technical product experts to increase your productivity and minimize
the software difficulties you encounter. These technical support engineers are experts on the E6621A PXT
test set, and its complementary software products. They have instant access to instruments and software
to enable them to resolve your issues as quickly as possible. Agilent will investigate all software defects
and operational problems reported through the technical support channel. Upon completion of the
investigation, we will advise you on possible solutions and functional alternatives. Where possible, Agilent
will provide software releases to address problems caused by defects in the firmware or software.
STSCs for the Agilent E6621A PXT
The N6050AS STSC covers the N6050A, N6051A and N6052A software applications running on the
E6621A PXT wireless communications test set, plus the associated N6061A and N6062A PC software
applications.
For more information on how to access technical support, refer to the section in the manual entitled,
Software and Technical Support Contracts
.
4
Agilent PXT Wireless Communications Test Set
User’s Guide
2 Front-panel and Menu Keys
This chapter outlines the front-panel key menus for the E6621A PXT in the Base Station Emulator mode. All frontpanel keys are listed in alphabetical order. All other keys (menu keys) are listed in the order they appear in their
menu (that is, not in alphabetical order).
Please note the following while reading this chapter:
− When discussing key paths within tables or text, front-panel keys are represented in bold; menu keys
appear in bold, italics.
− To determine the hierarchy of the keys, refer to the bookmarks in the PDF by selecting View > Show/Hide >
Navigation Panels > Bookmarks.
− If the Mode row in the menu key parameter table does not specify FDD or TDD, then it is available in both
modulation formats.
− All front-panel keys associated with the SA mode are discussed in the chapter entitled, RF Measurements
on page 189
.
5
Agilent PXT Wireless Communications Test Set
The PXT calculates the RSTP for you. See the RF1 Amplitude (RSTP) and RF2
Bandwidth
Number of Resource Elements in Bandwidth
5
300
10
600
20
1200
User’s Guide
Amp
(Amplitude) This front-panel key displays the following menu of keys.
Amplitude
RF1 Amplitude
RF2 Amplitude
RF1 Amplitude (RSTP)
RF2 Amplitude (RSTP)
AWGN
Key Path: Front-panel key
Amplitude
Sets the RF1/RF2 power level(s) in dBm.
This amplitude level represents the integrated power level, assuming all resource elements in the
bandwidth are occupied. It is sometimes called Channel BW Power (see 36.521-1 Appendix C.0) and, when
doing sensitivity testing, is equivalent to the concept of P
In order to determine the true Reference Signal Receive Power (RSRP), it is necessary to take into
consideration the actual number of occupied resource elements in the bandwidth.
Amplitude (RSTP) menu keys.
(see chapter 7 of 36.521-1).
REFSENS
Because reference signals are always transmitted and RSRP = Reference Signal Transmit Power (RSTP)
when the path loss is 0, the equation below is always true:
RSTP power level = PXT Amplitude – 10 log
bandwidth)
For example: If the BW = 10 MHz:
RSTP power level = PXT Amplitude - 10 log
= PXT Amplitude – 27.8
RSRP is defined in 3GPP TS 36.133, section 9.1.4.
For more information on RSRP, see the Meas > Information key description on page 77
For more information on how power level settings can affect the ability for the UE to connect, see UE is
not connecting.
10
(600)
(number of resource elements in the cell
10
.
6
Mode
BSE. SA
Range
−120 dBm to +10 dBm
Preset
−57 dBm
State Saved
Yes
Dependencies and/or Couplings
Coupled to RF1/RF2 Amplitude
Initial S/W Revision
6.0
Key Path
Amp
RF1 Amplitude
The specified output power for the RF out port is −110 dBm to −10 dBm.
Mode
BSE. SA
Range
−120 dBm to +10 dBm
Preset
−57 dBm
State Saved
Yes
Dependencies and/or Couplings
Coupled to RF1 Amplitude (RSTP)
Initial S/W Revision
6.0
Key Path
Amp
The specified output power for the RF out port is −110 dBm to −10 dBm.
Mode
BSE. SA
Range
−120 dBm to +10 dBm
Preset
−57 dBm
State Saved
Yes
Dependencies and/or Couplings
Coupled to RF2 Amplitude (RSTP)
Initial S/W Revision
6.0
Key Path
Amp
Sets the output power level in dBm for RF1.
Agilent PXT Wireless Communications Test Set
User’s Guide
The specified output power for the RF in/out port is −110 dBm to −15 dBm.
RF2 Amplitude
Sets the output power level in dBm for RF2.
The specified output power for the RF in/out port is −110 dBm to −15 dBm.
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Agilent PXT Wireless Communications Test Set
Mode
BSE. SA
Range
−150.79 dBm (for 20MHz Channel Bandwidth) to −14.77 dBm (for 5MHz)
Preset
− 84.78 dBm
State Saved
Yes
the bandwidth.
Initial S/W Revision
6.3
Key Path
Amp
Mode
BSE. SA
Range
−150.79 dBm (for 20MHz Channel Bandwidth) to −14.77 dBm (for 5MHz)
Preset
−84 78 dBm
State Saved
Yes
the bandwidth.
Initial S/W Revision
6.3
Key Path
Amp
User’s Guide
RF1 Amplitude (RSTP)
The value displayed on this menu key is read-only and is the RF1 amplitude expressed as an RSTP power
level determined by the following equation:
RSTP = Cell Power – 10 log
Dependencies and/or Couplings Read-only key dependent upon cell power and number of subcarriers in
(number of subcarriers in the bandwidth)
10
RF2 Amplitude (RSTP)
The value displayed on this menu key is read-only and is the RF2 amplitude expressed as an RSTP power
level determined by the following equation:
RSTP = Cell Power – 10 log
Dependencies and/or Couplings Read-only key dependent upon cell power and number of subcarriers in
(number of sub-carriers in the bandwidth)
10
8
Agilent PXT Wireless Communications Test Set
oc
N
You can change the cell power level without changing AWGN settings, enabling
Mode
BSE, SA
power and is therefore dependent upon the cell power.
AWGN for TDD added in software version 6.5.
Key Path
Amp
Mode
BSE, SA
Range
On | Off
Preset
Off
Initial S/W Revision
6.3
Key Path
Amp > AWGN
AWGN
AWGN, also referred to as
noise source (average power per resource element (RE) normalized to the subcarrier spacing), simulating
interference from cells, as measured at the UE antenna connector.
Note that the AWGN is determined by using a signal to noise ratio relative to the cell power.
This menu key enables you to access the following functions:
, in 3GPP specifications, is defined as the power spectral density of a white
you to maintain a constant signal to noise ratio, when required.
User’s Guide
Apply AWGN
Signal to Noise Ratio (RF1)
Signal to Noise Ratio (RF2)
Noc (RF1)
Noc (RF2)
Noise Amplitude (RF1)
Noise Amplitude (RF2)
AWGN MIMO Channel Mode
Dependencies and/or Couplings AWGN is determined by using a signal to noise ratio relative to the cell
Initial S/W Revision 6.3
Apply AWGN
On: Applies AWGN to the signal.
Off: Turns off AWGN.
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Agilent PXT Wireless Communications Test Set
Mode
BSE, SA
Range
−10 to +30
Preset
0
Initial S/W Revision
6.3
Key Path
Amp > AWGN
Mode
BSE, SA
Range
−10 to +30
Preset
0
Initial S/W Revision
6.3
Key Path
Amp > AWGN
oc
N
where the bandwidth is set equal to the serving cell channel bandwidth profile.
Mode
BSE, SA
Bandwidth)
Dependencies and/or Couplings
Read-only key
Initial S/W Revision
6.3
Key Path
Amp > AWGN
User’s Guide
Signal to Noise Ratio (RF1)
Specifies the desired signal to noise ratio for antenna port 1. Using the current amplitude, this value
determines the power level of AWGN applied to the signal.
Signal to Noise Ratio (RF2)
Specifies the desired signal to noise ratio for antenna port 2.This value is based on the current amplitude
and sets the power level of AWGN.
Noc (RF1)
Displays the resultant value of AWGN power level relative to a single resource element (as described in
3GPP 36.521-1) for RF port 1. This is the power level of AWGN relative to a single resource element given
the SNR RF1 and cell power setting.
Most of the RF conformance tests are expected to use
Value = Noise Amplitude (RF1) – 10 log10(Number Resource Elements in
(AWGN) = -98 [dBm/15kHz]
10
Agilent PXT Wireless Communications Test Set
where the bandwidth is set equal to the serving cell channel bandwidth profile.
Mode
BSE, SA
Bandwidth)
Dependencies and/or Couplings
Read-only key
Initial S/W Revision
6.3
Key Path
Amp > AWGN
Mode
BSE. SA
Value
= RF1 Amplitude – Signal to Noise Ratio (RF1)
Preset
−57
Dependencies and/or Couplings
Read-only key.
Initial S/W Revision
6.3
Key Path
Amp > AWGN
Mode
BSE, SA
Value
= RF1 Amplitude – Signal to Noise Ratio (RF2)
Preset
−57
Dependencies and/or Couplings
Read-only key
Initial S/W Revision
6.3
Key Path
Amp > AWGN
User’s Guide
Noc (RF2)
Displays the resultant value of AWGN power level relative to a single resource element (as described in
3GPP 36.521-1) for antenna port 2. This is the power level of AWGN relative to a single resource element,
given the SNR RF2 and cell power setting.
Most of the RF conformance tests are expected to use (AWGN) = −98 [dBm/15kHz]
Value = Noise Amplitude (RF2) – 10 log10(Number Resource Elements in
Noise Amplitude (RF1)
Displays the AWGN power level of antenna port 1 as an integrated power level, which is the same terms
used to set or display the total Cell power RF1 amplitude.
Noise Amplitude (RF2)
Displays the AWGN power level of antenna port 2 as an integrated power level, which is the same terms
used to set or display the total Cell power RF2 amplitude.
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Agilent PXT Wireless Communications Test Set
Mode
BSE, SA
Range
MIMO | Normal
Preset
Normal
Initial S/W Revision
6.3
Key Path
Amp > AWGN
Mode
BSE, SA
Range
–120 dBm to +50 dBm
Units
dBm
Initial S/W Revision
6.0
Key Path
Atten
If the reference (or attenuation) levels are incorrectly set, causing an overload
To ensure your measurement results are displayed correctly, compensate for
User’s Guide
AWGN MIMO Channel Mode
Enables you to set the AWGN for a MIMO model or for a Normal model (not MIMO).
MIMO: Sets AWGN for both paths of the MIMO channel setup.
Normal: Sets AWGN for normal channel setup.
Atten – Key Menu 1
(Attenuation) Accesses the settings that enable you to control the receiver level(s).
Ref Level
RF1 Ref Level
RF2 Ref Level
Attenuation
RF1 Input Attenuation
RF2 Input Attenuation
Key Path: Front-panel key
Ref Level
Sets the expected receiver level(s) for RF1.
CAUTION
condition, the red OVF warning indicator in the top right of the display illuminates. In
this case, increase the reference level or attenuation until the warning indicator turns
off.
external loss or gain by setting Atten > More > RF1 Input Power Offset.
12
Agilent PXT Wireless Communications Test Set
Mode
BSE. SA
Range
-120 dBm to +10 dBm
Preset
-57 dBm
State Saved
Yes for BSE mode. No for SA mode.
Dependencies and/or Couplings
Grayed out when Atten > Attenuation is set to Adaptive.
Initial S/W Revision
6.0
Key Path
Atten
Mode
BSE. SA
Range
-120 dBm to +10 dBm
Preset
-57 dBm
State Saved
Yes for BSE mode. No for SA mode.
Dependencies and/or Couplings
Grayed out when Atten > Attenuation is set to Adaptive.
Initial S/W Revision
6.0
Key Path
Atten
To ensure your measurement results are displayed correctly, compensate for
User’s Guide
RF1 Ref Level
Sets the expected receiver level for RF1 when you wish to specify different values for RF1 and RF2 inputs.
Otherwise, this value is set by pressing Atten > Ref Level.
RF2 Ref Level
This function is currently not available.
Attenuation
Manual: Enables you to define the attenuation level(s) for RF1.
Auto: Enables the PXT to calculate and set the optimum attenuation value based on the reference level
(and other internal parameters) set by pressing Atten > Ref Level.
Adaptive: Automatically adjusts the attenuation when the overflow (OVF) alarm is detected.
For example, if you wish to increase the number of uplink RBs, effectively increasing the UE power
consumption, the PXT automatically adjusts the attenuation to compensate for this change. See Adaptive
Attenuation – More Information.
Setting the Attenuation to Adaptive
• IDLE_ADJUSTER
• CONNECTED_ADJUSTER
• OVF_ADJUSTER
For more information on how power level settings can affect the ability for the UE to connect, see UE is
not connecting.
external loss or gain by setting Atten > More > RF1 Input Power Offset.
enables three options:
13
Agilent PXT Wireless Communications Test Set
Mode
BSE, SA
Range
Auto | Manual | Adaptive
Preset
Auto
Dependencies/Couplings
This menu key is coupled to RF1 Input Attenuation settings.
but the reverse is not true.
Key Path
Atten
User’s Guide
Initial S/W Revision 6.0
Adaptive attenuation was added in software revision 6.4.
Selecting Func > UE Power Control > CLCP sets Attenuation = Adaptive
Adaptive Attenuation - More Information
Adaptive attenuation is intended to eliminate manual attenuation control when the UL or DL path loss is
indeterminate, and allows automatic control by the instrument.
The simplest way of demonstrating adaptive attenuation is to connect your device, set UL Resource
Allocation Mode to Fixed Mac Padding
Resource Allocation), then Press SA > Func > UE Power Control and adjust the power. The power
measurement must track the power control settings sent to the UE, therefore you must set Power Adjust
(All Up) = On
.
(Mode > BSE > Mode Setup > More > PHY Settings > UL
With the default settings, you may find this process a little slow to adjust. If this is the case, use the OVF
adjuster button (Atten > More > OFV_ADJUSTER) to 5 dB and re-try. Then, set Power Adjust (All Down) =
On
, as shown in the figure below.
14
Agilent PXT Wireless Communications Test Set
DO NOT SIMPLY SET Power Adjust (All Down) = Off. This results in a dropped connection
1. Measurement results are not affected by this setting. To change the
Mode
BSE, SA
Range
Auto | Manual
Preset
Auto
Initial S/W Revision
6.0
Key Path
Atten
User’s Guide
(under investigation), because the PXT adjusts the attenuator too high. To alleviate this
issue, always switch back to the setting: Power Adjust (All UP) = On
this screen.
briefly, before leaving
OTA Example Settings for Adaptive Attenuation
It has been found that for some devices, the following OTA settings are successful when using the
adaptive attenuation function.
Set Atten > Attenuation = Adaptive
Set the Output Power Offset to +40 dBm on both RF1 and RF2 (Config > Amplitude Offsets > RF1/RF2
Output Power Offset).
Set IDLE_ADJUSTER (Atten > More > IDLE_ADJUSTER ) and CONNECTED_ADJUSTER (Atten > More >
CONNECTED_ADJUSTER ) both to -30 dBm.
Set UL Resource Allocation Mode to Fixed Mac Padding
Settings > UL Resource Allocation). Note that if Atten > Attenuation = Auto
alternative to setting the UL Resource Allocation Mode to Fixed Mac Padding
(All Up) = On
or Func > UE Power Control > Power Control Mode = CLCP.
.
(Mode > BSE > Mode Setup > More > PHY
, this is not required. An
, is to set UL Power Adjust
RF1 Input Attenuation
Auto: Enables the PXT to use the value set for Atten > RF1 Ref Level to calculate the required input
attenuation. Otherwise, this value is set by the Attenuation menu key.
Manual: Enables you to set the RF1 input attenuation value manually.
offset of your measurement results, use the Atten > RF1 Input Power
Offset setting.
2. The maximum power level to this input is: 27 dBm (.5 Watts) 5VDC.
RF2 Input Attenuation
This function is currently not available.
15
Agilent PXT Wireless Communications Test Set
Mode
BSE, SA
Range
1 dB to 20 dB
Units
dB
Preset
10
Initial S/W Revision
6.0
Key Path
Atten > More
Mode
BSE
Overwrites Scenario File Value
Yes
Range
-30 to 30
Units
dB
Preset
6
Dependencies and/or Couplings
Available only when Attenuation is set to Adaptive.
Initial S/W Revision
6.4
Key Path
Atten > More
User’s Guide
Atten – Key Menu 2
(Attenuation) Accesses the following settings.
Scale/Div
IDLE_ADJUSTER
CONNECTED_ADJUSTER
OVF_ADJUSTER
Key Path: Front-panel key
Scale/Div
Sets the units per vertical graticule division on the display.
IDLE_ADJUSTER
This parameter is automatically set by the PXT when Attenuation is set to Adaptive.
When the connection status is Idle or unavailable, the PXT is waiting for PRACH to be transmitted by the
UE.
The expected input value is automatically set to the level expected for a PRACH, with a few dB of headroom.
This value allows that expected input value to be increased or decreased – if it is expected that the UE may
be transmitting above or below the expected value.
16
Agilent PXT Wireless Communications Test Set
Mode
BSE
Overwrites Scenario File Value
Yes
Range
-30 to 30
Units
dB
Preset
0
Dependencies and/or Couplings
Available only when Attenuation is set to Adaptive.
Initial S/W Revision
6.4
Key Path
Atten > More
Mode
BSE
Overwrites Scenario File Value
Yes
Range
0 to 10
Units
dB
Preset
1
Dependencies and/or Couplings
Available only when Attenuation is set to Adaptive.
Initial S/W Revision
6.4
Key Path
Atten > More
User’s Guide
CONNECTED_ADJUSTER
This parameter is automatically set by the PXT when Attenuation is set to Adaptive.
This value is an adjustment applied to the expected input value when the UE is in the connected state.
OVF_ADJUSTER
This parameter is automatically set by the PXT when Attenuation is set to Adaptive.
If an overflow (OVF) is detected, as designated by the OVF light on the front-panel, this menu key enables
you to adjust the size of the automatic adjustments to the attenuation setting that will be made in Adaptive
mode to ensure accurate uplink power measurements are being made.
It should not be necessary for you to change the value of this parameter.
BSE
In the Base Station Emulator (eNodeB emulation) mode, the PXT simulates an LTE eNodeB's operation for use
in the development and test of LTE UEs. In this mode, you test the UE by setting up a call and establishing a
link.
Key Path: Front-panel key (Note: You may have to press the Mode key to obtain the menu keys below.)
Emulator Mode
The eNodeB simulation starts and stops by pressing this menu key. If simulation has started, the
instrument is ready to be connected with the UE. When simulation stops, the instrument transmits only
default signals in the downlink and all the tests are frozen.
Key Path: Mode > BSE
17
Agilent PXT Wireless Communications Test Set
Mode
BSE
Range
Run | Stop
Preset
Stop
Initial S/W Revision
6.0
Key Path
Mode > BSE
User’s Guide
Config
(Configuration) This front-panel key displays the following menu of functions:
RF Setup
Network Setup
Cell Setup
External Sync
Amplitude Offsets
General Config
Key Path: Front-panel key
RF Setup
Accesses the available parameters you can set to configure the RF in the BSE mode. Refer to RF
Measurements section for more information on the menus below.
RF Input Control
RF Output Control
Ref. Clock Source
Key Path: Config
RF Input Control
This menu key activates the following menu of functions:
Input Mode
Input Source
RF Select
Ext Cell Select
Refer to RF Measurements
Key Path: Config > RF Setup
section for more information on the menus below.
18
Agilent PXT Wireless Communications Test Set
Mode
BSE, SA
Range
Int | Ext
Preset
Int
Initial S/W Revision
6.0
Key Path
Config > RF Setup > RF Input Control
Mode
BSE, SA
Range
IF | IQ
Preset
IF
Initial S/W Revision
6.0
Key Path
Config > RF Setup > RF Input Control
Mode
BSE, SA
Range
A-Cell | B-Cell
Preset
B-Cell
Initial S/W Revision
6.0
Key Path
Config > RF Setup > RF Input Control
User’s Guide
Input Mode
Int: When set to internal, the front-panel inputs are active.
Ext: When set to external, the Input Source key is activated to enable selection from the rear panel inputs.
Input Source
IF: When set to IF, the uplink rear panel inputs accept IF signals.
IQ: When set to IQ, the uplink inputs accept analog IQ signals and the downlink analog IQ outputs and
inputs are active.
RF Select
Sets RF port.
Key Path: Config > RF Setup > RF Input Control
Ext Cell Select
Sets the cell (A or B) for which you are defining all parameters.
RF Output Control
This menu key activates the following menu of functions:
RF DL Output
RF1 Front Output
RF2 Front Output
19
Agilent PXT Wireless Communications Test Set
Mode
BSE, SA
Range
Int | Ext
Preset
Int
Initial S/W Revision
6.0
Key Path
Config > RF Setup > RF Output Control
Mode
BSE, SA
Range
TRX | TX
Preset
TRX
Initial S/W Revision
6.0
Key Path
Config > RF Setup > RF Output Control
Mode
BSE, SA
Range
TRX | TX
Preset
TRX
Initial S/W Revision
6.0
Key Path
Config > RF Setup > RF Output Control
User’s Guide
Ext Cell Select
Refer to RF Measurements
Key Path: Config > RF Setup
section for more information on the menus below.
RF DL Output
Enables external processing of the IQ signals (for example: fading) before RF up-conversion takes place.
There are four BNC outputs associated with this menu key: I1 OUTPUT, Q1 OUTPUT, I2 OUTPUT, and
Q2 OUTPUT. The corresponding inputs are: I1 RETURN, Q1 RETURN, I2 RETURN, and Q2 RETURN.
RF1 Front Output
TRX: Indicates that the DL RF1 Output is present on the antenna port labeled RF1 Input/Output.
TX: Indicates that the DL RF1 Output is present on the antenna port labeled RF1 Output.
RF2 Front Output
TRX: Currently not available because RF2 Input/Output is not available.
TX: Indicates that the DL RF2 Output is present on the antenna port labeled RF2 Output.
20
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