Low latency frame notification in a wireless network

1 . A first wireless device comprising:

a wireless transceiver; and

a controller configured to communicate within a transmit opportunity (TXOP) as a TXOP holder, wherein the controller is configured to:

receive a low latency (LL) buffered frame indication from a second wireless device at a first inter frame space, wherein the first wireless device supports low latency preemption; and

determine that the LL buffered frame indication from the second wireless device is not received at the first inter frame space and, in response, transmit a physical layer protocol data unit (PPDU) with a second inter frame space that is greater than the first inter frame space;

wherein the LL buffered frame indication from the second wireless device is a Clear to Send (CTS)-to-self with an address field being set to a Basic Service Set Identifier (BSSID).

2 . The first wireless device of claim 1 ,

wherein the controller is further configured to transmit a soliciting PPDU to solicit the LL buffered frame indication, and wherein the first inter frame space follows the soliciting PPDU.

3 . The first wireless device of claim 2 ,

wherein the PPDU does not include a LL buffered frame.

4 . The first wireless device of claim 1 ,

wherein the controller is further configured to receive the LL buffered frame indication from the second wireless device within the TXOP.

5 . The first wireless device of claim 1 ,

wherein the controller is further configured to receive a low latency frame from the second wireless device.

6 . The first wireless device of claim 1 ,

wherein the controller is further configured to receive a low latency frame from a wireless access point (AP).

7 . The first wireless device of claim 1 ,

wherein the first and second wireless device are included in a Basic Service Set (BSS);

wherein the BSS includes an additional set of wireless devices;

wherein the controller is configured to announce a maximal PPDU length in the BSS; and

wherein the wireless devices in the BSS that support low latency preemption cannot transmit a PPDU that exceeds the maximal PPDU length.

8 . The first wireless device of claim 1 ,

wherein a TXOP limit is announced, and wherein the second wireless device cannot have a TXOP duration that is longer than the announced TXOP limit.

9 . The first wireless device of claim 1 ,

wherein the controller is further configured to announce a TXOP limit, and wherein the second wireless device cannot have a TXOP duration that is longer than the announced TXOP limit.

10 . The first wireless device of claim 1 ,

wherein the controller is further configured to receive a plurality of LL buffered frame indications, each of the plurality of LL buffered frame indications carried in a separate PPDU generated using a common Modulation Coding Scheme (MCS), Number of Spatial Streams (Nss), or scrambling initial value.

11 . The first wireless device of claim 1 ,

wherein the controller is further configured to receive a plurality of LL buffered frame indications from a plurality of stations, and

wherein the stations are allocated to different groups such that each group is in a different resource unit (RU).

12 . The first wireless device of claim 1 ,

wherein the first wireless device is compatible with an Institute of Electrical and Electronics Engineers (IEEE) 802.11 protocol.

13 . The first wireless device of claim 1 ,

wherein the first wireless device is compatible with an Institute of Electrical and Electronics Engineers (IEEE) 802.11be protocol.

14 . The first wireless device of claim 1 ,

wherein the first wireless device is a component of a multi-link device (MLD).

15 . The first wireless device of claim 1 ,

wherein the first wireless device is a wireless access point (AP).

16 . The first wireless device of claim 1 ,

wherein the first inter frame space is a Short Interframe Space (SIFS).

17 . A method for wireless communications, the method comprising:

communicating within a transmit opportunity (TXOP) by a first wireless device, including receiving a low latency (LL) buffered frame indication from a second wireless device after an inter frame space that is equal to a Short Interframe Space (SIFS), wherein the first wireless device and the second wireless device support low latency preemption;

soliciting, by the first wireless device, the LL buffered frame from the second wireless device; and

in response to not receiving the LL buffered frame, transmitting a physical layer protocol data unit (PPDU) using a second inter frame space that is greater than SIFS;

wherein the LL buffered frame indication from the second wireless device is a Clear to Send (CTS)-to-self with an address field being set to a Basic Service Set Identifier (BSSID).

18 . The method of claim 17 ,

wherein communicating within the TXOP comprises transmitting two consecutive frames within the TXOP.

19 . A first wireless device comprising:

a wireless transceiver; and

a controller configured to communicate within a transmit opportunity (TXOP) as a TXOP holder,

wherein the controller is configured to receive a low latency (LL) buffered frame indication from a second wireless device at a first inter frame space;

wherein the first and second wireless devices support low latency preemption;

wherein the controller is further configured to transmit, via the wireless receiver, a physical layer protocol data unit (PPDU) with a second inter frame space that is greater than the first inter frame space when the LL buffered frame is not received at the first inter frame space;

wherein the first and second wireless device are included in a Basic Service Set (BSS) that further includes an additional set of wireless devices;

wherein the controller is configured to announce a maximal PPDU length in the BSS; and

wherein the wireless devices in the BSS that support low latency preemption cannot transmit a PPDU that exceeds the maximal PPDU length;

wherein the LL buffered frame indication from the second wireless device is a Clear to Send (CTS)-to-self with an address field being set to a Basic Service Set Identifier (BSSID).