User's Manual

Individual ATP Test Background Information68P09258A31–A
Oct 2003
1X SCt 4812T BTS Optimization/ATP
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TX Pilot Time Offset Acceptance Test
This test verifies the transmitted Pilot channel element Pilot Time Offset
of each BBX carrier keyed up at a specific frequency per the current
CDF file assignment. All tests are performed using the external
calibrated test set controlled by the same command. All measurements
are via the appropriate TX OUT (BTS/RFDS) connector.
The Pilot Gain is set to 262 for each antenna, and all TCH elements from
the MCCs are forward link disabled. The BBX is keyed up, using both
bbxlvl and bay level offsets, to generate a CDMA carrier (with pilot
channel element only, Walsh code 0). BBX power output is set to
40 dBm as measured at the TX OUT connector (on either the BTS or
RFDS directional coupler).
The calibrated communications test set measures and returns the Pilot
Time Offset in µs, verifying results meet system tolerances:
S Pilot Time Offset should be within v3 ms of the target PT
Offset (0 ms).
The BBX then de-keys, and if selected, the MCC is re-configured to
assign the applicable redundant BBX to the current TX antenna path
under test. The test is then repeated.
See Table 4-1 to perform this test.
TX Code Domain Power/Noise Floor Acceptance Test
This test verifies the Code Domain Power/Noise of each BBX carrier
keyed up at a specific frequency per the current CDF file assignment.
All tests are performed using the external calibrated test set controlled by
the same command. All measurements are via the appropriate TX OUT
(BTS/RFDS) connector.
For each sector/antenna under test, the Pilot Gain is set to 262. All MCC
channel elements under test are configured to generate Orthogonal
Channel Noise Source (OCNS) on different odd Walsh codes and to be
assigned a full–rate gain of 81. The maximum number of MCC/CEs to
be tested an any one time is 32 (32 odd Walsh codes). If more than 32
CEs exist, then multiple sets of measurements are made; so all channel
elements are verified on all sectors.
BBX power output is set to 40 dBm as measured at the TX OUT
connector (on either the BTS or RFDS directional coupler).
Verify the code domain power levels, which have been set for all ODD
numbered Walsh channels, using the OCNS command. This is done by
verifying that Pilot Power (dBm) minus OCNS Power (dBm) is equal to
10.2 $
2 dB and that the noise floor of all “OFF” Walsh channels
measures v
–27 dB (with respect to total CDMA channel power).
NOTE
When performing this test using the LMF and the MCC is an MCC8E
or MCC24E, the redundant BBX may fail or show marginal
performance. This is due to a timing mismatch that the LMF does not
address. Performing this test from the CBSC will not have this timing
problem.
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