Chapter 2 WCDMA Call Mode
System parameters
64 WCDMA Options Version 6.20
Performing interfrequency
handover tests
Interfrequency handovers are crucial to support several aspects of the WCDMA
system. For example, WCDMA networks have multiple frequency carriers within
one cell. Thus seamless interfrequency handovers is necessary to support hot-
spot scenarios in which one cell uses a larger number of carriers than
surrounding cells. Another aspect is the usage of hierarchical cell structures in
order to increase capacity. The structure is built by overlaying macro, micro and
pico cells. The cells belonging to different layers are on different frequencies
which requires an interfrequency handover. Furthermore interfrequency
handovers are necessary for performing handovers to a different operator or to
other systems, for example GSM. A seamless interfrequency handover requires
the UE to perform a cell search on a different carrier frequency from the current
one without any adverse effects on the normal data flow.
You can perform interfrequency handover tests by changing the frequency
during measurements by entering a different UARFCN in the UARFCN test
parameter field. For further details on entering test parameters refer to “Test
parameters” on page 39.
System parameters
The Parameter menus allow you to access additional parameters relevant in both
call mode and in non-call mode at a more detailed level, which need not be
changed in everyday use. In these menus you can set a number of system param-
eters, to set test limits or to define a coupling loss curve.
To gain access to these menus, simply push the
Param... softkey, which is avail-
able on all measurement screens, while the UE is in idle state.
Using the marker tabs, you can select between the following menus:
– “Basic System Parameters” on page 66 – in this menu you can define the
parameters for simulating the WCDMA cell as well as the parameters for the
code channels necessary to simulate a DL signal.
– “Measurement Limits” on page 71 – this menu allows you to set measure-
ment limits for modulation quality measurements.
– “Power Limits” on page 73 – in this menu you can set parameters for power
measurements.
– “Coupling Loss” on page 75 – this menu allows you to compensate the losses
of cables, splitters and other RF equipment. This is especially important
when working with the universal antenna coupler.
– “Spectrum ACLR” on page 79 – in this menu you can define parameters for
Adjacent Channel Leakage Power Ratio spectrum measurements.
– “Spectrum SEM” on page 80 – in this menu you can define parameters for
Spectrum Emission Mask measurements.
BLER [%]
The Block Error Rate indicates the number of erroneous
data blocks in relation to the total number of data blocks
in a transmission. It is expressed as a percentage. A BLER
of 0 would be ideal.
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