With the increasing popularity of WI-FI CERTIFIED Passpoint(TM) program many hotspot owners look forward to installing new Hotspot 2.0 equipment into their networks. Access Network Query Protocol (ANQP) is used by a subscriber station (SS) in Hotspot 2.0 technology for selecting the network before association with an access point (AP). It simplifies the network selection and discovery mechanisms from the user's point of view. On the other hand this technology uses some new management frame elements, which cause additional airtime overhead in Wi-Fi network. This paper analyzes the overhead caused by new elements in Beacon and Probe Response frames. It shows the increasing airtime as a measure of Hotspot 2.0 protocol overhead. It also describes some dependencies between the airtime overhead and number of co-located wireless local area networks (WLAN), number of virtual service set identifiers (SSID), management frames transmission rate.

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This paper evaluates the quality of service (QoS) in Wi-Fi networks considering medium access control algorithms. It provides the wireless local area networks (WLAN) traffic analysis based on hotspot statistics. It also studies the distribution of physical layer frame arrival time and channel utilization time. The results show the presence of self-similar distribution dramatically influencing the QoS parameters. The paper suggests QoS evaluation model in Wi-Fi public networks considering both user and signaling traffic.

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This paper analyzes WiFi access point selection mechanisms used by IoT WiFi devices. A testbed for experimental setup is proposed. The testbed includes several WiFi access points, WiFi controller and WiFi network analyzer. More than 900 measurements covering 19 test cases are made. It is shown that an received signal strength indicator is the primary criterion used by the IoT WiFi device for access point selection during connection procedure.