CDMA2000 Measurements
R&S
®
CMW-KG8xx/-KM8xx/-KS8xx
739
User Manual 1173.9511.02 ─ 11
For additional information refer to
For query of the results via remote control, see
chapter 5.3.7, "Multi Evaluation: Mea-
5.2.8 OLTR Measurement
The Open Loop Time Response (OLTR) application measures the DUT's TX power
response to decreases and increases of the total base station power.
5.2.8.1
General Measurement Procedure
A single OLTR measurement comprises 1 to 5 measurement sequences, each
addressing a pair of oppositely directed power steps. The step direction is configurable
and defines the direction of the first BS power step. With each additional and consecu-
tive measurement sequence the step direction is toggled, e.g. 2 measurement sequen-
ces with an initial power DOWN step result in an overall step sequence DOWN-UP-
DOWN-UP.
The OLTR measurement can be used with any application that is able to control the
forward link power and to provide a trigger signal to the measurement application indi-
cating the power steps. E.g. it is possible to use the GPRF generator with an ARB file
containing suitable power steps, decorated with a particular marker type, serving as
trigger source for the measurement application.
In general the OLTR measurement proceeds as depicted in the following figure:
Start OLTR
Measurement:
• adjust expected
power
*
• start building the
RP trace
RPI
OLTR Evaluation Interval
(fixed: 100 ms)
GI
After GI
restart measurement logic:
• adjust expected power
*
• start building the RP trace
etc ...
After OLTR
Evaluation Interval:
• stop building the
OLTR trace
• wait
On trigger event:
• stop updating the RP trace
(now representing the RPI preceding the trigger event)
• start building the OLTR trace
...
Trigger
indicating power step 1
RP: Reference Power
RPI: RP Interval
GI: Guard Interval
...
RPI
After RPI has elapsed:
continuously update the RP trace
(FIFO) and wait for trigger event
* according to step direction (derived
from configured "first step direction" and
step number), and configured step size
power step 1
measurement
power step 2 ...
measurement
Reference power
measurement
phase
Trigger
indicating power step 2
...
Fig. 5-17: OLTR Measurement Procedure
Each power step measurement is subdivided into 3 phases:
●
Reference power measurement phase
The phase between the start of the power step measurement and the next trigger
event (indicating the power step).
General Description
深圳德标仪器
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