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

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 exceeds the T_Comp (5 is the default value) threshold and the Cell 2 pilot (Pilot Offset 36) is flagged as "To Add" (see T_Comp Behavior for description). The Cell 2 pilot is added to the Active set of pilots when the soft handoff is initiated.

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 is corresponding to the Pilot Ec/Ior parameter in the TIA/EIA-98E standard and the F-FCH/Traffic Level field corresponding to the Traffic Ec/Ior parameter.

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3. Clear the Mobile Station Reported Pilot Level Information display (see E. Clear Mobile Pilot Report ).
4. Set the Cell 2 Power ( F1 ) to -60 dBm/1.23 MHz and set the AWGN Power ( F3 ) to Off (see C. Set the Cell 2 Power and AWGN Power ). This causes the Cell 2 Pilot Strength (26, -13 dB) to above the T_ADD (28, -14 dB) threshold. Observe the Mobile Station Reported Level Information display. The Cell 2 pilot (Pilot Offset 36) should be flagged as a "Candidate" since the reported Pilot Strength crosses T_ADD.
      

   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.

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5. Press the Cell 2 Power ( F1 ), slowly turn the knob until it is set to -52 dBm/1.23 MHz. This causes the Cell 2 pilot level to exceed the T_COMP threshold.
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 is stronger than Cell 1 Pilot Strength (24, -12 dB) by more than T_Comp (5). The test set flags the Cell 2 pilot (Pilot Offset 36) as "To Add" when the reported Pilot Strength crosses T_Comp threshold.

   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 is stronger than Cell 1 Pilot Strength by at least T_Comp (5 indicating 2.5 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 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.

   
7. At this point a soft handoff should be established with Cell 2. Press the Soft Handoff (F4 ) key and set the Soft Handoff State to On .
8. Observe the Mobile Station Reported Level Information display. Both Cell 1 and Cell 2 pilots should be Active and current Handoff Status is Soft. This indicates that a soft handoff has been established with Cell 2 and Cell 1 as active set pilot and traffic channels.