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.
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.
-
Press the
CALL SETUP
key.
-
Press
Operating Mode
(
F1
) and select
Active Cell (EGPRS)
.
-
Select
PDTCH Parameters
(
F9
) from the
Call Parms
menu.
-
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.
-
Select
Modulation Coding Scheme
(
F11
) from the
PDTCH Parms
menu. The
Modulation Coding Scheme
popup menu appears.
-
Select
Uplink Modulation Coding Scheme
and select
MCS-9
.
-
Select
Incremental Redundancy
and select
On
.
-
Press the
More
softkey on the right side of the front panel display to access the
PDTCH Parms
(
2 of 2
) menu.
-
Select
Multislot Config
(
F7
) and select the maximum number of timeslots supported by the mobile station you are testing.
-
Press the
More
softkey on the left side of the front panel display to access the
Control
(
2 of 2
) menu.
-
Select
Protocol Control
(
F4
).
-
Select
RLC/MAC
(
F2
).
-
Select the
Block Poll Rate
and enter
32
.
-
Press the
More
softkey on the left side of the front panel display to access the
RLC/MAC Ctrl
(
2 of 2
) menu.
-
Select
Window Size
and select
Maximum
.
-
Start protocol logging.
-
Start transferring data.
-
Set Cell Power to -97 dBm.
-
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.
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