R&S CMW-KM5 Series, User Manual

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LTE Signaling
R&S
®
CMW-KM5xx/-KS5xx
24 User Manual 1173.9628.02 ─ 16
noise ratio). The modulated signals from neighbor cells simply appear as noise. This
effect is simulated by adding AWGN to the signal.
The internal fading module supports AWGN insertion with configurable bandwidth and
signal to noise ratio. Insertion loss at the baseband level is calculated and compensa-
ted automatically at the HF.
AWGN insertion via the signaling unit is disabled for fading scenarios (see "AWGN"
on page 137).
2.2.6 Data Tests and Voice Over LTE
The LTE signaling application provides a test mode, using only layer 1 and 2 of the
protocol stack. And it provides a data application mode that supports also layer 3.
To use the data application mode, you need the following options in addition to the
"LTE signaling" application:
●
Data Application Unit (DAU, R&S CMW-B450x, mandatory)
●
IPv4 enabler (R&S CMW-KA100, mandatory)
IPv6 enabler (R&S CMW-KA150, optional)
●
DAU measurements (R&S CMW-KM050, optional)
●
IMS server (R&S CMW-KAA20, optional)
●
Installed DAU software package
If there is no space left for installation of a DAU in your instrument, you can install all
these options in another R&S
CMW and access the external DAU via LAN. For such a
setup, you need additionally R&S CMW-KA120, both on the instrument hosting the
external DAU and on the instrument where the LTE signaling application is running.
In data application mode, you can perform IP-based data tests using the DAU meas-
urements or you can perform an RLC throughput measurement. You can also use the
IMS server provided by the DAU to set up a Voice over LTE (VoLTE) call.
For further reference:
●
chapter 2.2.20, "RLC Throughput Measurement" , on page 73
●
chapter 2.3.2, "LTE IP-Based Data Tests" , on page 79
This application sheet describes how to set up an LTE connection in data applica-
tion mode and provides some examples for IP-based data tests.
●
chapter 2.3.3, "VoLTE Call Setup and Audio Tests" , on page 83
This application sheet describes how to set up a VoLTE call and how to perform
basic audio tests for the established call.
●
"Data Application Unit" documentation
●
"External DAU" on page 163
2.2.7 Audio Tests and Speech Quality Tests
You can connect the LTE signaling application to the speech codec of an installed
audio board. This allows you, to feed an audio signal into an RF connection to the UE
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