Generated Pilot Level Information
Last updated: October 28, 2004
This section is only applicable to the lab application.
The Generated Pilot Level Information table on the upper part of the Soft Handoff Information screen shows the current settings of Cell 1and Cell 2, which include the cell power, pilot power, PN Offset, and Pilot Strength for each cell. This is the actual signal being output to the mobile station. See Configuring Soft Handoff Parameters to access the Generated Pilot Level Information table.
The Generated Pilot Level Information table can assist you to verify the correct MS pilot reporting behavior (see Verifying MS Pilot Reporting Behavior in Soft/Softer Handoff ). For example, if the Generated Pilot Level Information table indicates that the Cell 2 Delta Power is stronger than T_Add (28 is the default value) multiplied by -0.5 dB, and the mobile station has not sent a Pilot Strength Measurement Message, a failure condition may exist with the mobile station. Send the pilot measurement request (see F. Send Pilot Meas Request ) and check the mobile reported Pilot Strength for Cell 2.
Description
The following information are displayed on the Generated Pilot Level Information table:
Total RF Power
The total RF power (I o ) is the sum of Cell 1 Power (Î or ), Cell 2 Power (Î or )and AWGN Power (I oc ). The Cell 1 Power (dBm/1.23 MHz), Cell 2 Power (dBm/1.23 MHz) and AWGN Power (dBm/1.23 MHz) are directly settable from the test set (see Configuring Cell Power and AWGN Power Levels and Configuring Cell 2 Power ).
Pilot Power
The Cell 1/2 Pilot Power (dBm/1.23 MHz) is the sum of the Cell 1 Power (Î or ) and Cell 1/2 F-Pilot Level (Pilot E c /I or ). The Cell 1/2 Power (dBm/1.23 MHz) and Cell 1/2 F-Pilot Level (dB) (see Configuring Soft Handoff Parameters ) are directly settable from the test set. The Cell 1/2 Pilot Power is to facilitate to calculate the Pilot Delta Power .
Pilot Delta Power
The Cell 1/2 Pilot Delta Power (dB) is the Cell 1/2 pilot level relative to the total RF power. It is equivalent to the Pilot E c /I o in the standard defined as the ratio of the combined pilot energy per PN chip to the total received power spectral density at the mobile station, including noise and other signals.
The Cell 1/2 Pilot Delta Power is not directly settable and calculated by subtracting the Pilot Power from the Total RF Power . See Total RF Power, Delta Power and Pilot Strength Calculation for details.
The Cell 1 Pilot Delta Power can be queried with the CALL:STATus:PILot[:CELL[1]][:LEVel]:RTTotal[:SELected]? and the Cell 2 Pilot Delta Power can be queried with the CALL:STATus:PILot:CELL2[:LEVel]:RTTotal[:SELected]? .
Pilot Strength
The Pilot Strength values is the value of Pilot Delta Power divided by -0.5 dB and rounded off to the nearest integer value. The test set converting the Pilot Delta Power to the Pilot Strength is to facilitate you to verify the correct mobile station pilot reporting behavior, which the mobile station reports pilot strength in units of -0.5 dB. These values should correspond to Pilot Strength values the mobile station reports in the Mobile Station Reported Pilot Level Information table (see Mobile Station Reported Pilot Level Information ).
The Cell 1 Pilot Strength can be queried with the CALL:STATus:PILot[:CELL[1]]:STRength[:SELected]? and the Cell 2 Pilot Strength can be queried with the CALL:STATus:PILot:CELL2:STRength[:SELected]? .
PN Offset
The PN Offset uniquely identifies each base station. The PN Offset values displayed in the Generated Power Level Information table can assist you to verify the correct mobile station reported PN Offset values in the Mobile Station Reported Pilot Level Information . The PN Offset values reported by the mobile station in the Mobile Station Reported Pilot Level Information table should correspond to these values.
The Cell 1/2 PN Offset can be changed either from the front panel (see How Do I Change Generator Information? ), or with CALL[:CELL[1]]:PNOFfest and CALL:CELL2:PNOFfset .
Settings That Effect the Generated Pilot Level Information Display
The following table is an example settings as specified in the standard. It also shows how to set on the test set to achieve the specified values. The Ioc, Traffic Ec/Ior, and Pilot Ec/Ior are all directly settable on the test set. For Ior/Ioc, which is the ratio of cell power to AWGN, you need to adjust Cell 1 Power (for Channel 1) and Cell 2 Power (for Channel 2) to achieve the correct levels relative to AWGN. Delta Power is then used to verify that all parameters are set correctly.
Total RF Power, Delta Power and Pilot Strength Calculation
- Cell 1 Power = -58.3 dBm/1.23 MHz (equivalent to 1.5488 E-6 mw)
- Cell 2 Power = -55.1 dBm/1.23 MHz (equivalent to 3.0903 E-6 mw)
- AWGN Power = -55 dBm/1.23 MHz (equivalent to 3.1623 E-6 mw)
- Total RF Power = Cell 1 Power + Cell 2 Power + AWGN Power = 7.8014 E-6 mw (equivalent to -51.08 dBm/1.23 MHz)
- Channel 1 Pilot Power = Cell 1 Power + Cell 1 Pilot Level = -58.1 + (-7) = -65.1 dBm/1.23 MHz
- Channel 2 Pilot Power = Cell 2 Power + Cell 2 Pilot Level = -55.1 + (-7) = -62.1 dBm/1.23 MHz
- Cell 1 Pilot Delta Power = Cell 1 Pilot Power - Total RF Power = -65.1 - (-51.08) = -14.02 dB
- Cell 2 Pilot Delta Power = Cell 2 Pilot Power - Total RF Power = -62.1 - (-51.02) = -11.02 dB
- Cell 1 Pilot Strength = Cell 1 Pilot Delta Power / (-0.5) = (-14.02)/ (-0.5) = ~ 28
- Cell 2 Pilot Strength = Cell 2 Pilot Delta Power / (-0.5) = (-11.02)/ (-0.5) = ~ 22
Related Topics
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Mobile Station Reported Pilot Level Information
Verifying MS Pilot Reporting Behavior in Soft/Softer Handoff
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