Tips for analyzing protocol logs of Incremental Redundancy and Retransmission MCS Switching
Last updated: December 2, 2008
This section is only applicable to the EGPRS lab application.
You can use the Wireless Protocol Advisor (WPA) to observe and analyze messages and information related to incremental redundancy and retransmission modulation and coding scheme switching. This section contains some examples of how you can modify the WPA view to make it easier to access certain fields.
Your default WPA traffic overview column setup may look similar to Default WPA Traffic Overview .
To more easily see the changes in modulation and coding scheme and to observe any changes in puncturing scheme, you can add protocol field columns to the traffic overview (see WPA Traffic Overview with additional Protocol Field Columns ). If you add the Coding and Puncturing Scheme Indicator field from the RLC_MAC layer, you can see what MCS and PS are being used to send each EGPRS RLC Data message. Adding BSN1 and BSN2, also from the RLC_MAC layer, allows you to see which blocks are being sent and when they are retransmitted. BSN2 is the block sequence number for the second block sent as part of an MCS that sends two RLC blocks at once, therefore, it is only useful if you are using MCS-7, MCS-8, or MCS-9.
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