How Do I Make Soft/Softer Handoff Tests Regarding T_Add?

Last updated: October 28, 2004

This section is only applicable to the lab application.

With this test setup, the mobile station is expected to send a Pilot Strength Measurement Message (PSMM) to the base station when the Cell 2 Pilot Strength crosses the T_ADD threshold (28 is the default, indicates -14 dB relative to the total RF power) and the Cell 2 pilot (Pilot Offset 36) is flagged as a "Candidate" (see T_Add Behavior for description).

1. Establish a call (see A. Establish a call. ) with the Cell 1 Power set to -55 dBm/1.23 MHz.
2. Set the Soft Handoff Parameters to the defaults (see B. Set Up Soft/Softer Handoff Parameters ) and make sure the Soft Handoff ( F4 ) is Off .
      

   NOTE

   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 in the TIA/EIA-98E standard.

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3. Clear the Mobile Station Reported Pilot Level Information table (see E. Clear Mobile Pilot Report ).
4. Set the Cell 2 Power ( F1 ) to -65 dBm/1.23 MHz and set the AWGN Power ( F3 ) to Off (see C. Set the Cell 2 Power and AWGN Power ). This results in the Cell 2 Pilot Strength (35, -17.5dB) below T_Add (28, -14dB). No Pilot Strength Measurement Message (PSMM) is expected to send from the mobile station.
      

   NOTE

   The Cell Power field is corresponding to the Î _or parameter in the TIA/EIA-98E standard and the AWGN Power field corresponding to the I _oc parameter in the TIA/EIA-98E standard.

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5. Press the Cell 2 Power ( F1 ), slowly turn the knob until it is set to -60 dBm/1.23 MHz. This causes the Cell 2 Pilot Strength (26, -13 dB) to above the T_ADD (28, -14 dB) threshold for soft handoff.
6. Observe the Mobile Station Reported Level Information display. The mobile station should have sent a Pilot Strength Measurement Message (PSMM) to the base station since the Cell 2 Pilot Strength crosses the T_ADD threshold. The test set flags the Cell 2 pilot (Pilot Offset 36) as a "Candidate" when the reported Pilot Strength crosses T_ADD.

   If the Generated Pilot Level Information display, which shows the actual pilot strength and PN offset transmitted by the test set, indicates that the Cell 2 Pilot Strength crosses T_Add threshold (28, -14 dB) and the mobile station has not sent a PSMM, a failure condition may exist with the mobile station. Send the pilot measurement request by pressing the Send Pilot Meas Request ( F5 ) key (see F. Send Pilot Meas Request ) and compare the mobile reported pilot information to the actual information in the Generated Pilot Level Information display.