Extension mode for wireless LANs complying with short interframe space requirement

A first wireless device comprising:

• a transmitter configured to transmit, in accordance with a first mode of operation or a second mode of operation, a packet to a second wireless device, wherein the packet includes a header portion and a data portion, and wherein a maximum time interval for the second wireless device to respond to the packet is as follows
• (i) in response to the packet being transmitted to the second wireless device in accordance with the first mode of operation, the second wireless device is to respond to the packet within a predetermined time period, and
• (ii) in response to the packet being transmitted to the second wireless device in accordance with the second mode of operation, the second wireless device is to respond to the packet in a time greater than the predetermined time period,
• wherein in response to the packet being transmitted to the second wireless device in accordance with the first mode of operation, the transmitter is configured to encode the header portion of the packet to indicate that the packet is being sent in accordance with the first mode of operation, and
• wherein in response to the packet being transmitted to the second wireless device in accordance with the first mode of operation, the transmitter is configured to i) encode the header portion of the packet to indicate that the packet is being sent in accordance with the second mode of operation, and ii) insert dummy data into the data portion of the packet, wherein the dummy data sent to the second wireless device during the time greater than the predetermined time period.