Then send block of QoS data frames & requesting all QoS data frame to ACK by sending Block ACK Request (BAR) to receiving station. When a station intend to use Block ACK mechanism to transmit QoS data, it first check to see whether the peer station is capable of Block ACK. You can filter them on wireshark using below display filter. The Control Wrapper is used to carry any other control frame, other than another Control Wrapper frame together with HT Control field (in 802.11n). Here is a brief description of each type of Control Frame & how you can filter them in wireshark. So below figure shows the different type of control frames. The type ( always 1 for control frames) & subtype fields identify the function of a frame.
Unlike management & data frames, Control frames does not have a frame body. 802.11 Control Frames assist with the delivery of Data & Management frames.
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