Useful Radio Statistics September 2003 Useful Radio Statistics John Klein Symbol Technologies, Inc. jklein@sj.symbol.com September 17, 2003 John Klein, Symbol Technologies

Month 2002 doc.: IEEE 802.11-02/xxxr0 September 2003 Purpose Collection and correlation of Radio Statistics from either the STA or the AP can aid network management applications and IT personnel better understand and more easily troubleshoot WLAN problems. John Klein, Symbol Technologies John Doe, His Company

Categories Scanning Statistics Transmit Statistics Receive Statistics Month 2002 doc.: IEEE 802.11-02/xxxr0 September 2003 Categories Scanning Statistics Transmit Statistics Receive Statistics Antenna Statistics Roaming History John Klein, Symbol Technologies John Doe, His Company

Scanning Statistics Unassociated Scans Quality Scans Month 2002 doc.: IEEE 802.11-02/xxxr0 Scanning Statistics September 2003 Unassociated Scans Number of scans performed while unassociated. Usually takes the most client power. Quality Scans Scanning looking for a better AP or an AP that can maintain a higher data rate. Skipped channel average How many channels were scanned before selecting a channel. Channel Select Stats What channels were selected and how often. John Klein, Symbol Technologies John Doe, His Company

Transmit Statistics Mostly covered by the dot11peerStatsEntry Month 2002 doc.: IEEE 802.11-02/xxxr0 Transmit Statistics September 2003 Mostly covered by the dot11peerStatsEntry Tx Directed Total Tx Failures Percent Tx Retries (running average over time) Percentage of Tx’ed packets at each data rate Other Transmit Categories Tx Data Frames, Tx Probes, Tx Action Frames, Tx Authentication Frames, RTS/CTS etc. John Klein, Symbol Technologies John Doe, His Company

Receive Statistics Mostly covered by dot11peerStatsEntry Month 2002 doc.: IEEE 802.11-02/xxxr0 Receive Statistics September 2003 Mostly covered by dot11peerStatsEntry Rx Statistics on STA’s indicate how well the STA hears the AP Rx Directed Total Rx Duplicate Rx failed CRC Rx failed MIC Rx failed decryption Percent Missed Beacons (running average over time) John Klein, Symbol Technologies John Doe, His Company

Antenna Statistics Rx’ed on Antenna Counts Month 2002 doc.: IEEE 802.11-02/xxxr0 Antenna Statistics September 2003 Rx’ed on Antenna Counts Number of packets received on any particular antenna Large skew to one side can pinpoint a hardware problem Understanding Tx failures on an antenna over another can pinpoint a hardware problem Last packet Rx’ed on antenna Last packet received on a particular antenna Aids in selection of Tx antenna for next packet John Klein, Symbol Technologies John Doe, His Company

Roaming History Report Month 2002 doc.: IEEE 802.11-02/xxxr0 Roaming History Report September 2003 Short roaming history list from STA BSSID selected Start RSSI or other signal quality indicator (RCPI) at time of association Roaming Reason (quality, load, dropped). Why did the STA decide to initiate a roam. Channel Scan Info: # of channels scanned, channel selected, scan direction # of SSIDs received during scan (searching for multi ESS systems) Location to BSS when roam completed John Klein, Symbol Technologies John Doe, His Company