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WCDMA Signaling
R&S
®
CMW-KG4xx/-KM4xx/-KS4xx
34
User Manual 1173.9657.02 ─ 11
The two signaling applications use two different TX/RX modules. The connection is
not interrupted. From the GSM signaling version 3.2.30 also the inter RAT hand-
over WCDMA - GSM within a single TX/RX module is supported.
●
Redirection:
The R&S
CMW performs an RRC connection release with redirection information.
This mechanism is relevant for a redirection between two different WCDMA instan-
ces as well as for a redirection to another signaling application (e.g. LTE) or
another instrument.
A redirection results in the registration of the UE at the handover destination. No
new connection is set up.
●
Circuit switched fallback from LTE to WCDMA:
During the E-UTRAN CS connection the UE sends to the R&S
CMW an extended
service request with Circuit Switched Fallback (CSFB). Then the R&S
CMW per-
forms an RRC connection release with redirection information. The UE sends a
paging response to the handover destination and a new CS connection is estab-
lished by the target (WCDMA) signaling application.
To perform a handover, proceed as follows:
1. Ensure the correct R&S
CMW - UE cabling. Use different RX/TX modules ("Con-
verter" setting). For the inter RAT handover to GSM one TX/ RX module is suffi-
cient.
2. In the WCDMA signaling application, establish a connection to the UE.
3. Press the "Inter/Intra-RAT ..." hotkey. A configuration dialog box opens.
4. Configure the settings in the dialog:
a) Select the handover target - either the WCDMA signaling application or another
signaling application or "No Connection" for an external instrument.
b) Configure the destination parameters. For a handover to an external instrument
the parameters must reflect the actual configuration of the external instrument.
c) If you have selected another signaling application as target, the target cell is
activated automatically (downlink signal switched on). Wait until the cell icon
includes a RDY to indicate that the handover target is ready to receive the
handover.
5. Press the "Handover" button.
You can monitor the handover process in the "Event Log" area of the main view of
the signaling applications.
If you want to reconfigure only one parameter of the WCDMA signaling application, you
can also do this directly, without using the "Inter/Intra-RAT ..." hotkey. Simply modify
the channel or the operating band during an established connection. The R&S
CMW
then initiates the parameter reconfiguration.
As an example, the handover from WCDMA to GSM is described in more detail, see
chapter 2.3.2, "Handover from WCDMA to GSM"
General Description
深圳德标仪器
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