Patent ID: 7990995

Claim:
A wireless communication apparatus, comprising: a reception device configured to receive a first physical frame from a first wireless communication apparatus, wherein, in the first physical frame, a plurality of Quality of Service (QoS) data and an immediate Block Ack request are aggregated; an immediate type storing area to store a first bitmap indicating reception statuses of the plurality of QoS data; and a controller configured to read out, after the immediate Block Ack request is received, the first bitmap stored in the immediate type storing area, and to generate and transmit an immediate Block Ack based on the first bitmap, wherein the immediate Block Ack is transmitted after a Short Interframe Space (SIFS) has elapsed since the first physical frame is received, and wherein, in response to the reception device receiving a second physical frame from a second wireless communication apparatus, the first bitmap is discarded from the immediate type storing area and a second bitmap indicating reception statuses of a plurality of QoS data included in the second physical frame is stored in the immediate type storing area.