LTE Signaling
R&S
®
CMW-KM5xx/-KS5xx
77
User Manual 1173.9628.02 ─ 16
6. In section "RF Settings", select a bidirectional RF connector for input and output. In
this example RF 1 COM is used.
If necessary, also adjust the "External Attenuation" settings.
7. Close the configuration dialog.
8. To turn on the DL signal, press ON | OFF and wait until the "LTE Signaling" softkey
indicates the "ON" state and the hour glass symbol has disappeared.
9. Switch on the UE.
The UE synchronizes to the DL signal and attaches. A default bearer is estab-
lished.
Note the connection states displayed in the main view and wait until the attach pro-
cedure is complete.
By default, the RRC connection is kept after the attach is complete.
10. The default bearer and the established RRC connection are usually sufficient for
testing.
If you want to set up a dedicated bearer, press the "Connect" hotkey.
Note the connection states displayed in the main view and wait until the connection
has been established.
Failed attach
If the attach procedure fails, check whether the UE capabilities are in accordance with
the security settings in the "Network" section of the configuration dialog.
The default power settings are usually appropriate, but you may check them in the con-
figuration dialog sections "Downlink Power Levels" and "Uplink Power Control".
If your UE needs a DL signal without padding bits for attach, disable downlink padding
in the "Connection" section of the configuration dialog.
2.3.1.3
Analyzing the UL Signal from the UE
While an established connection is available, the UL signals from the UE can be moni-
tored using the "LTE Multi Evaluation" measurement (included in option R&S CMW-
KM500).
To ensure compatible measurement settings, the measurement must be coupled to the
"LTE Signaling" application. This is done by selecting the combined signal path sce-
Application Sheets
深圳德标仪器
135-1095-0799