LTE Signaling
R&S
®
CMW-KM5xx/-KS5xx
14
User Manual 1173.9628.02 ─ 16
nection carries one uplink and one downlink signal. An additional connection carries
the second downlink signal. The two downlink signals must be transmitted via different
TX modules and different RF connectors, which implies that the instrument must sup-
port at least two TX paths. You can use for example RF 1 COM for the bidirectional
connection and RF 3 COM for the second downlink connection.
Fig. 2-2: Test setup for "1 Cell - 2 RF Out"
Using several signaling applications in parallel
Depending on the installed hardware and software options, you can run several signal-
ing application instances in parallel.
Example: Assume an instrument with two Signaling Unit Wideband (SUW), one Signal-
ing Unit Universal (SUU), four TX paths and four RX paths.
This instrument allows you to run for example:
●
Two LTE signaling instances using the "1 Cell - 2 RF Out" scenario, or
●
Two LTE signaling instances using the "1 Cell - 1 RF Out" scenario, plus one
instance of an SUU signaling application (e.g. GSM / CDMA2000)
●
One LTE signaling instance using the "1 Cell - 2 RF Out" scenario, plus one
instance of an SUW signaling application (e.g. WCDMA)
●
One LTE signaling instance using a carrier aggregation scenario with or without
MIMO
The LTE and WCDMA signaling applications both use the SUW. Signaling instance 1
uses SUW1, while instance 2 uses SUW2. An SUW can only be used by one instance
at a time. You can run for example LTE signaling instance 2 and WCDMA signaling
instance 1 in parallel, but not instance 1 of both applications.
2.2.1.3
Test Setup for Scenario 1 Cell - 4 RF Out
The scenario "1 Cell - 4 RF Out" is used for MIMO 4x2 setups, where the four TX
antenna signals must be available at the RF connectors. Typically, an external RF
fader is inserted into the downlink connection and one bidirectional connection carries
one uplink and one downlink signal. Three additional connections carry the other
downlink signals.
All downlink signals must be transmitted via different TX modules and different RF con-
nectors, which implies that the instrument must support four TX paths and must be
equipped with two signaling units SUW.
General Description
深圳德标仪器
135-1095-0799