| CPC H04L 27/2602 (2013.01) [H04L 1/1614 (2013.01); H04L 1/1621 (2013.01); H04L 1/1861 (2013.01); H04L 5/0055 (2013.01); H04W 28/04 (2013.01); H04W 28/06 (2013.01); H04W 72/121 (2013.01); H04B 7/0452 (2013.01); H04L 2001/0093 (2013.01); H04L 5/0007 (2013.01); H04L 27/2603 (2021.01); H04L 27/26035 (2021.01); H04W 84/12 (2013.01)] | 18 Claims |

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1. A station (STA) configured for multi-user (MU) communications, the STA comprising:
a transmitter configured to transmit, to an access point (AP), in an uplink (UL) multi-user (MU) transmission, a frame;
a receiver configured to receive, from the AP, a MU block acknowledgment (BA), wherein the MU BA includes a plurality of STA specific information subfields, wherein at least one of the plurality of STA specific information subfields includes an indication of a BA, wherein, in accordance with the indication of the BA, the at least one of the plurality of STA specific information subfields includes a first portion and a second portion, wherein the first portion indicates length information for the second portion, and wherein the second portion includes STA specific BA information.
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