DELBA Frame format

The DELBA frame is depicted below

Fig Courtesy: 802.11 Standard

• The Category field is set to 3 – indicating Block Ack
• Block Ack Action field is set to 2 – representing DELBA
• The DELBA Parameter set contains the below
  • The initiator subfield – indicates who is sending the DELBA frame – the originator of the data or the recipient of the data frame
    • 1 – indicates DELBA sent by data originator
    • 0 – indicates DELBA sent by data recipient
  • TID – indicates the TID for which the Block Ack session was originally established.

The DELBA Parameter set is shown below

• Reason code field indicates the reason for sending the DELBA frame

Block ACK Frame Formats – Block Ack Request