Enhancements for coordinated orthogonal block-based resource allocation (cobra) in wlan systems

An IEEE 802.11 station (STA) capable of receiving data from an IEEE 802.11 access point (AP) via a coordinated orthogonal block resource allocation (COBRA), the STA comprising:

• a receiver configured to receive a first multi-user (MU) transmission including a COBRA schedule from the AP at a beginning of a COBRA transmission opportunity (TxOP), wherein the COBRA TxOP is a reservation of a wireless medium for the STA and at least one other STA, via carrier sense multiple access (CSMA);
• a transmitter configured to transmit an acknowledgement (ACK) to the AP in the COBRA TXOP in response to the received COBRA schedule;
• the receiver further configured to receive a second MU transmission including a first data packet and at least one other data packet for the at least one other STA in the COBRA TxOP based on the COBRA schedule;
• a processor configured to determine whether the first data packet is received successfully;
• on a condition that the first data packet is not received successfully, the transmitter is further configured to transmit a negative acknowledgement (NACK) to the AP in the COBRA TxOP;
• and
• the receiver is further configured to receive a third MU transmission including a second data packet in the COBRA TxOP, wherein the second data packet is a retransmission of the first data packet.