Setting Downlink Channel Codes And Levels; How To Set Channel Codes And Levels - Agilent Technologies 8960 Series Reference Manual

Setting Downlink Channel Codes and Levels

Setting Downlink Channel Codes and Levels
During Active Cell operation, downlink scrambling and channelization codes are used by the UE to
synchronize to the base station emulator's frame clock and to specify message formats for call processing
operations.
The relative level of all channels can be individually set or turned off (although the P-CCPCH and the SCH are
controlled together). The level of each active channel is a fraction of the Cell Power setting, expressed in dB.
If the summed level of all channels is less than one, the orthogonal coded noise source (OCNS) is turned on to
account for the difference.

How to Set Channel Codes and Levels

Active Cell operating mode emulates a base station in operation, and is used for call processing operations.
During call processing, the downlink channel levels for establishing the call may be different than the levels
used after the call has been connected. This is why there are two different level settings for the downlink
codes: Downlink Channel Levels and Connected DL Channel Levels. See "CALL[:CELL]:OPERating" to
select operating modes.
The Downlink Channel Levels settings are used during the initial call processing operation to establish the
call. These levels can only be changed in the Cell Off operating mode. You can query these settings via GPIB
and view them on the front panel during Active Cell mode operation, but attempting to change the levels
during Active Cell mode operation results in an error message.
The Connected DL Channel Levels are used when the UE is successfully connected on a call. These levels
can be changed while using either the Active Cell or Cell Off operating modes. This allows you to vary the
relative channel levels while a call is connected in order to test the UE's response.
Downlink Channel Codes can only be changed during Cell Off operation.
Figure 5. The Downlink Code Channel Information on the Generator Information Screen
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