How Do I Test Mobile Station (MS) Closed Loop Power Control (CLPC) Behavior in Soft/Softer Handoff?
Last updated: October 28, 2004
This section is only applicable to the lab application.
When the mobile station is in a soft or softer handoff, there are two power control subchannels affecting closed loop power control. The difference between the soft and softer handoff types consists of messaging that the test set sends to the mobile station regarding closed loop power control subchannel bit (see
Verifying Mobile Station (MS) Closed Loop Power Control (CLPC) Behavior in Soft/Softer Handoffs
).
Testing the mobile station's ability to respond correctly to more than one power control subchannel is shown by the following two examples.
Verifying MS CLPC Behavior in Soft Handoff
With this test setup, the mobile station is expected to perform an "or of down" logic function on the closed loop power control bits (the mobile station increases its power level if and only if the power control bits from both cells are indicating up).
-
Establish a call (see
A. Establish a call.
) with the Cell 1 Power set to -55 dBm/1.23 MHz.
-
Set the Soft Handoff Parameters (T_Add, T_Comp, T_Drop, etc.) to the defaults (see
B. Set Up Soft/Softer Handoff Parameters
) (Handoff Type is Soft )and make sure the
Soft Handoff
(
F4
) state is
Off
.
The F-Pilot Level field corresponds to the Pilot Ec/Ior parameter in the TIA/EIA-98E standard and the F-FCH/Traffic Level field corresponds to the Traffic Ec/Ior parameter.
-
Clear the Mobile Station Reported Pilot Level Information table (see
E. Clear Mobile Pilot Report
).
-
Set the
Cell 2 Power
(
F1
) to -50 dBm/1.23 MHz and set the
AWGN Power
(
F3
) to
Off
(see
C. Set the Cell 2 Power and AWGN Power
).
The Cell Power field corresponds to the Î
or
parameter in the TIA/EIA-98E standard and the AWGN Power field corresponds to the I
oc
parameter in the TIA/EIA-98E standard.
-
Observe the Delta Power results in the Generated Pilot Level Information table, and the PN Status and Handoff Status in the Mobile Station Reported Pilot Level Information table.
-
Set the
Soft Handoff
(F4
) to
On
(see
D. Initiate the Soft or Softer Handoff
). Observe the changes on the Mobile Station Reported Pilot Level Information table, the Handoff Status should indicate Soft and the PN Status of Cell 1 and Cell 2 should indicate Active.
Selecting Soft in the Handoff Type causes the PWR_COMB_IND bit in the Handoff Direction Message to be set to a '0' and the Handoff Direction Message is sent to the mobile station when the
Soft Handoff
(F4
) is set to
On
.
-
Select
Channel Power
measurement by pressing the
Measurement Selection
key and observe the measurement results (see
Measuring Channel Power
).
-
Press the
More
key on the right side of the screen until
2 of 3
is displayed.
-
Change the Cell 1 and Cell 2 closed loop power control mode and observe the Channel Power measurement results:
-
Set
Cell 1 Rvs CLPC
(
F7
) to
All Down bits
and set
Cell 2 Rvs CLPC
(
F8
) to
Active bits
. The mobile station's output power is expected to decrease, observe the Channel Power measurement results.
-
Set
Cell 1 Rvs CLPC
(
F7
) to
All Up bits
and set
Cell 2 Rvs CLPC
(
F8
) to
All Up bits
. The mobile station's output power is expected to increase, observe the Channel Power measurement result.
-
Set
Cell 1 Rvs CLPC
(
F7
) to
Active bits
and set
Cell 2 Rvs CLPC
(
F8
) to
All Down bits
. The mobile station's output power is expected to decrease, observe the Channel Power measurement results.
Verifying MS CLPC Behavior in Softer Handoff
With this test setup, the mobile station is expected to perform diversity combining of power control bits (ignore the weaker bits). In this example, since the Cell 2 power is stronger than Cell 1 power, the mobile station should follow the Cell 2 Closed Loop Power Control.
-
Establish a call (see
A. Establish a call.
) with the Cell 1 Power set to -55 dBm/1.23 MHz.
-
Press the
Soft Handoff Parameters (F2
) key, set the
Handoff Type
to Softer (see
B. Set Up Soft/Softer Handoff Parameters
).
-
Clear the Mobile Station Reported Pilot Level Information table (see
E. Clear Mobile Pilot Report
).
-
Set the
Cell 2 Power
(
F1
) to -50 dBm/1.23 MHz and set the
AWGN Power
(
F3
) to
Off
(see
C. Set the Cell 2 Power and AWGN Power
).
The Cell Power field corresponds to the Î
or
parameter in the TIA/EIA-98E standard and the AWGN Power field corresponds to the I
oc
parameter in the TIA/EIA-98E standard.
-
Observe the Delta Power results in the Generated Pilot Level Information table, and the PN Status and Handoff Status in the Mobile Station Reported Pilot Level Information table.
-
Set the
Soft Handoff
(F4
) to
On
(see
D. Initiate the Soft or Softer Handoff
). Observe the changes on the Mobile Station Reported Pilot Level Information table, the Handoff Status should indicate Softer and the PN Status of Cell 1 and Cell 2 should indicate Active.
Selecting Softer in the Handoff Type causes the PWR_COMB_IND bit in the Handoff Direction Message to be set to a '1' and the Handoff Direction Message is sent to the mobile station when the
Soft Handoff
(F4
) is set to
On
.
-
Select
Channel Power
measurement by pressing the
Measurement Selection
key and observe the measurement results (see
Measuring Channel Power
).
-
Press the
More
key on the right side of the screen until
2 of 3
is displayed.
-
Change the Cell 1 and Cell 2 closed loop power control mode and observe the Channel Power measurement results:
-
Set
Cell 1 Rvs CLPC
(
F7
) to
All Down bits
and set
Cell 2 Rvs CLPC
(
F8
) to
Active bits
. The mobile station's output power is expected to maintained at the expected power level, observe the Channel Power measurement results.
-
Set
Cell 1 Rvs CLPC
(
F7
) to
Active bits
and set
Cell 2 Rvs CLPC
(
F8
) to
All Down bits
. The mobile station's output power is expected to decrease, observe the Channel Power measurement result.
-
Set
Cell 1 Rvs CLPC
(
F7
) to
Active bits
and set
Cell 2 Rvs CLPC
(
F8
) to
All Up bits
. The mobile station's output power is expected to increase, observe the Channel Power measurement results.
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