The wlan radio is continually making measurements on the radio spectrum and reports this back via the counters command. This includes statistics on the various types of packets both transmitted and received - even those not intended for this radio eg unicast, multicast, control frames, beacons. tly, bad headers, checksums etc. Therefore, when performing rf testing it is necessary to use a screened box in order to eliminate the background traffic from being heard by your device.
The application note N4010 Wireless Connectivity Measurement Setup Procedures shows how to perform tx and rx testing and how to identify the packets you are sending to the radio for test purposes.
Thanks for the reply. That helps.