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wlan wifi performance wlan troubleshooting wlan performance wlan performance assurance wlan qoe wireless performance wifi qos wifi qoe wifi optimization wlan optimization wlan end user experience application performance #wifi kpi quality assurance 802.11g 802.11n 802.11a ieee 802.11hew 802.11agn #wlan qoe performance key performance indicator quality of experience wireless 802.11 voice quality 802.11 performance wlan performance management 802.11 wlan service assurance wifi reliability wlan reliability wireless lan tcp