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LTE Signaling
R&S
®
CMW-KM5xx/-KS5xx
25
User Manual 1173.9628.02 ─ 16
or to extract an audio signal from the RF connection, in order to perform audio meas-
urements. You can for example connect the R&S UPV to the audio board of the
R&S
CMW and perform a speech quality analysis.
To set up a voice over LTE connection, you need the DAU, see
To connect the LTE signaling application to the speech codec, you need the following
options in addition to the "LTE signaling" application:
●
Audio board, R&S CMW-B400B
●
Speech codec, R&S CMW-B405A
●
LTE R8, SISO, advanced signaling, R&S CMW-KS510
●
Installed audio software package
For further reference:
●
chapter 2.3.3, "VoLTE Call Setup and Audio Tests"
This application sheet describes how to set up a VoLTE call and how to perform
basic audio tests for the established call.
●
"Audio Measurements" documentation
2.2.8 Connection States
An LTE connection is always a packet switched connection. In uplink direction there is
only one carrier with one stream. In downlink direction there are up to two carriers (car-
rier aggregation) and each carrier can carry several downlink streams (e.g. MIMO 4x2).
A connection setup with carrier aggregation is a two step procedure. In the first step, a
Release 8 single carrier connection is set up. The used carrier is called Primary Com-
ponent Carrier (PCC). In the second step an additional carrier is added, called Secon-
dary Component Carrier (SCC).
The related connection states are described in the following sections. For a connection
without carrier aggregation, only the packet switched states are relevant.
2.2.8.1
Packet Switched States
The main connection states related to the primary packet switched connection are
described in the following table. They are related to the PCC downlink connection and
to the uplink connection. The states are displayed in the main view as "Packet
Switched" (PS) state.
PS State
Description
(Cell) Off
No downlink signal transmission
(Cell) On
The R&S
CMW emulates an E-UTRAN cell, transmitting an LTE signal to which the UE
can synchronize. After synchronization the UE can initiate an attach towards the instru-
ment.
General Description
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