LTE Signaling
R&S
®
CMW-KM5xx/-KS5xx
79
User Manual 1173.9628.02 ─ 16
(TPC) commands to the UE and observe the resulting uplink power in the measure-
ment dialogs. Or you can modify the channel configuration for the uplink and observe
the result in the "RB Allocation Table".
2.3.1.5
SRS and PRACH Measurements
In addition to the "LTE Multi Evaluation" measurement, option R&S CMW-KM500 pro-
vides also an SRS measurement and a PRACH measurement.
Performing a combined signal path SRS measurement is similar to performing a multi
evaluation measurement. Before switching on the downlink signal, you must enable
SRS in section "Physical Cell Setup" of the signaling application. As a result the UE will
send an SRS signal after connection setup. The other steps are similar.
For PRACH measurements you do not establish a connection. Configure the PRACH
settings in section "Physical Cell Setup" of the signaling application. It is recommended
to activate "No Response to Preambles" and to set "Power Ramping Step" to 0 dB.
When you have configured all required settings, switch on the downlink signal and the
UE. The UE will send random access preambles which are not answered by the instru-
ment. Use the PRACH measurement to measure these preambles.
2.3.2 LTE IP-Based Data Tests
This application sheet provides examples for testing LTE data transfer over IP, using
the LTE signaling application and the Data Application Unit (DAU). It describes how to
prepare the measurements, how to measure the network latency using ping and how
to measure the downlink throughput for data transfer via UDP/IP.
2.3.2.1
Options and Equipment Required
The described tests require the following equipment:
●
Wideband Radio Communication Tester R&S CMW500 with software version
≥
V2.0.20. The latest software version is recommended.
This application sheet describes software version V3.2.60.
●
Option R&S CMW-KS500, LTE FDD R8, basic signaling
or option R&S CMW-KS550, LTE TDD R8, basic signaling
●
Option R&S CMW-KM050, data application measurements (requires hardware
R&S CMW-B450x, data application unit)
●
Option R&S CMW-KA100, Enabling of IP-Data interface for IPv4
2.3.2.2
Preparing the Tests
For test preparation, you need to configure the signaling application, set up a connec-
tion and configure the measurement.
Application Sheets
深圳德标仪器
135-1095-0799