How do I test Incremental Redundancy?

How do I test Incremental Redundancy?

Last updated: December 2, 2008

This section is only applicable to the EGPRS lab application.

Observing Incremental Redundancy

The only way to observe the puncturing scheme changes made by the incremental redundancy algorithm is to use the protocol logging capability of the test set. One way to observe this is to use your mobile station as a modem and transfer a file over the air. Transferring something large allows you to more easily observe changes. See Modem Functional Test with the Data Channel or FTP Throughput Test with the Data Channel for more details. For help setting up the Wireless Protocol Advisor (WPA) for protocol logging see Protocol Logging .

Procedure

This procedure assumes that the BCH parameter for Cell Band is set up correctly for your mobile station and that the appropriate RF IN/OUT Amplitude Offsets have been set to offset loss between the mobile station and the test set. Additionally, this procedure also assumes that the WPA is running and has already established a connection with the test set.

   
NOTE
The parameter values chosen below set up the protocol stack according to the Method of Test for Incremental Redundancy Performance defined in 3GPP TS 51.010 Section 14.18.7. See Support for the Incremental Redundancy Performance Specification for more details.
   

  1. Press the CALL SETUP key.
  2. Press Operating Mode ( F1 ) and select Active Cell (EGPRS) .
  3. Select PDTCH Parameters ( F9 ) from the Call Parms menu.
  4. Select MS TX Level ( F10 ) from the PDTCH Parms menu. The MS TX Level popup menu appears. Enter the value that corresponds to the maximum transmit power on the uplink for the active Cell Band.
  5. Select Modulation Coding Scheme ( F11 ) from the PDTCH Parms menu. The Modulation Coding Scheme popup menu appears.
  6. Select Uplink Modulation Coding Scheme and select MCS-9 .
  7. Select Incremental Redundancy and select On .
  8. Press the More softkey on the right side of the front panel display to access the PDTCH Parms ( 2 of 2 ) menu.
  9. Select Multislot Config ( F7 ) and select the maximum number of timeslots supported by the mobile station you are testing.
  10. Press the More softkey on the left side of the front panel display to access the Control ( 2 of 2 ) menu.
  11. Select Protocol Control ( F4 ).
  12. Select RLC/MAC ( F2 ).
  13. Select the Block Poll Rate and enter 32 .
  14. Press the More softkey on the left side of the front panel display to access the RLC/MAC Ctrl ( 2 of 2 ) menu.
  15. Select Window Size and select Maximum .
  16. Start protocol logging.
  17. Start transferring data.
  18. Set Cell Power to -97 dBm.
  19. Stop protocol logging when the data transfer is complete. See Tips for analyzing protocol logs of Incremental Redundancy and Retransmission MCS Switching for help with analyzing the log.

Related Topics

Tips for analyzing protocol logs of Incremental Redundancy and Retransmission MCS Switching

Incremental Redundancy