1. QoS Statistics Date: 2004-01-18 Authors: January 2005 January 2005
doc.: IEEE /xxxxr0
January 2005
QoS Statistics
Date:
Authors:
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Simon Black, Nokia
Simon Black, Nokia

2. January 2005
doc.: IEEE /xxxxr0
January 2005
Abstract
This presentation addresses the issue of adding metrics to the 11k draft to allow data to be collected regarding 11e QoS operation.
Simon Black, Nokia
Simon Black, Nokia

3. January 2005
References
QoS Metrics for Traffic Category/Stream, Emily Qi, November 2004, document 04/1204r2
Simon Black, Nokia

4. January 2005
11e Statistics
11e draft amendment contains a number of MIB counters relating to QoS operation (e.g. dot11QoSCounters)
Observing these counters within a measurement duration for each TID gives a starting point for collecting information on QoS performance
Simon Black, Nokia

5. Interesting QoS statistics
January 2005
Interesting QoS statistics
dot11QoSTransmittedFrameCount – count of successfully transmitted MSDUs
dot11QoSFailedCount – increments when an MSDU for a particular TID fails due to the number of retries reaching either dot11ShortRetryLimit, or dot11LongRetryLimit.
dot11QoSDiscardedFrameCount – increments for each discarded MSDU of a particular TID
dot11QoSMultipleRetryCount – increments when an MSDU is successfully transmitted after more than one retransmission.
Simon Black, Nokia

6. Interesting QoS Statistics
January 2005
Interesting QoS Statistics
A frame can be discarded due to MSDU lifetime being reached, or the number of retries reaching the appropriate retry limit
dot11QoSFailedCount addresses specifically the number of retries reaching the appropriate retry limit
dot11QoSDiscardedFrameCount minus dot11QoSFailedCount gives the number of discards due to MSDU lifetime having been reached
dot11QoSMultipleRetryCount gives information as to whether discards due to MSDU lifetime were the result of medium access delays, or many retries.
Simon Black, Nokia

7. Extending QoS Statistics
January 2005
Extending QoS Statistics
The 11e MIB counters are kept for TIDs 0-7. Similar statistics are also interesting for TID Discards due to lifetime would be relative to the delay bound in the TSPEC (if present)
At a QAP, the 11e MIB counters are kept for TIDs 0-7 but for all associated QSTAs. It would be useful to have the QAP keep some statistics for each associated QSTA. This could be achieved through extension of the 11k dot11peerStatsTable
Additional counters might be interesting, e.g. a count of QoS Polls issued by the HC where there is no response from the QSTA. These could be specified as additional MIB counters within the 11k extensions.
Simon Black, Nokia

8. January 2005
Summary
11e MIB counters could provide a starting point for QoS metrics in 11k
These could be accessed via extensions to the 11k statistics measurement
Additional statistics could be specified to enhance the information available, including per-QSTA counters at a QAP.
Simon Black, Nokia