TECHNIQUES FOR REDUCING THE PROBABILITY OF COLLISIONS WHEN TRANSMITTING LOW LATENCY DATA USING PREEMPTION

1 . A method performed by a first wireless device to transmit low latency data using a slotted random access technique, comprising:

detecting an end of a fragmented physical layer protocol data unit (PPDU) transmission made by a second wireless device;

randomly selecting a slot from a plurality of slots forming a slot window that is to follow a short interframe space (SIFS) interval after the end of the fragmented PPDU transmission; and

attempting to transmit low latency data during the randomly selected slot.

2 . The method of claim 1 , wherein a combined duration of the SIFS interval and the slot window is shorter than a predefined interframe space (xIFS) interval that is used by the second wireless device between fragmented PPDU transmissions.

3 . The method of claim 1 , further comprising:

responsive to determining that the attempt to transmit the low latency data was unsuccessful, attempting to transmit the low latency data during a next slot window that follows a SIFS interval after an end of a next fragmented PPDU transmission made by the second wireless device.

4 . The method of claim 3 , wherein the selected slot is randomly selected based on randomly selecting a slot index from a plurality of slot indices, wherein each of the plurality of slots is assigned a different one of the plurality of slot indices.

5 . The method of claim 4 , further comprising:

obtaining information regarding a number of slots included in the slot window from a frame transmitted by the second wireless device during a link reservation process.

6 . The method of claim 1 , wherein a number of slots included in the slot window depends on a priority of the low latency data.

7 . The method of claim 1 , wherein the fragmented PPDU transmission is part of a fragmented multiple PPDU (multi-PPDU) simultaneous transmission made by the second wireless device in a plurality of subchannels, wherein the method further comprises:

randomly selecting a subchannel from the plurality of subchannels, wherein the attempt to transmit the low latency data is made in the randomly selected subchannel.

8 . A method performed by a wireless device to transmit low latency data using a frequency resource random access technique, the method comprising:

detecting an end of a fragmented multiple physical layer protocol data unit (multi-PPDU) simultaneous transmission made by a second wireless device in a plurality of subchannels;

randomly selecting a subchannel from the plurality of subchannels; and

attempting to transmit low latency data in the randomly selected subchannel following a short interframe space (SIFS) interval after the end of the fragmented multi-PPDU simultaneous transmission.

9 . The method of claim 8 , wherein the second wireless device uses a predefined interframe space (xIFS) interval between fragmented multi-PPDU simultaneous transmissions, wherein preemption is allowed during the xIFS interval and a duration of the xIFS interval is longer than a duration of the SIFS interval.

10 . The method of claim 8 , further comprising:

responsive to determining that the attempt to transmit the low latency data was unsuccessful, attempting to transmit the low latency data in a randomly selected subchannel following a SIFS interval after an end of a next fragmented multi-PPDU simultaneous transmission made by the second wireless device.

11 . The method of claim 8 , further comprising:

receiving an acknowledgement (ACK) frame from the second wireless device in the randomly selected subchannel that acknowledges the low latency data.

12 . A first wireless device configured to transmit low latency data using a slotted random access technique, the first wireless device comprising:

a radio frequency transceiver;

a memory device storing a set of instructions; and

a processor coupled to the memory device, wherein the set of instructions when executed by the processor causes the first wireless device to:

detect an end of a fragmented physical layer protocol data unit (PPDU) transmission made by a second wireless device;

randomly select a slot from a plurality of slots forming a slot window that is to follow a short interframe space (SIFS) interval after the end of the fragmented PPDU transmission; and

attempt to transmit low latency data during the randomly selected slot.

13 . The first wireless device of claim 12 , wherein a combined duration of the SIFS interval and the slot window is shorter than a predefined interframe space (xIFS) interval that is used by the second wireless device between fragmented PPDU transmissions.

14 . The first wireless device of claim 12 , wherein the set of instructions when executed by the processor further causes the first wireless device to:

responsive to determining that the attempt to transmit the low latency data was unsuccessful, attempting to transmit the low latency data during a next slot window that follows a SIFS interval after an end of a next fragmented PPDU transmission made by the second wireless device.

15 . The first wireless device of claim 12 , wherein the selected slot is randomly selected based on randomly selecting a slot index from a plurality of slot indices, wherein each of the plurality of slots is assigned a different one of the plurality of slot indices.

16 . The first wireless device of claim 12 , wherein the fragmented PPDU transmission is part of a fragmented multiple PPDU (multi-PPDU) simultaneous transmission made by the second wireless device in a plurality of subchannels, wherein the set of instructions when executed by the processor further causes the first wireless device to:

randomly selecting a subchannel from the plurality of subchannels, wherein the attempt to transmit the low latency data is made in the randomly selected subchannel.

17 . A first wireless device configured to transmit low latency data using a frequency resource random access technique, the first wireless device comprising:

a radio frequency transceiver;

a memory device storing a set of instructions; and

a processor coupled to the memory device, wherein the set of instructions when executed by the processor causes the first wireless device to:

detect an end of a fragmented multiple physical layer protocol data unit (multi-PPDU) simultaneous transmission made by a second wireless device in a plurality of subchannels;

randomly select a subchannel from the plurality of subchannels; and

attempt to transmit low latency data in the randomly selected subchannel following a short interframe space (SIFS) interval after the end of the fragmented multi-PPDU simultaneous transmission.

18 . The first wireless device of claim 17 , wherein the second wireless device uses a predefined interframe space (xIFS) interval between fragmented multi-PPDU simultaneous transmissions, wherein preemption is allowed during the xIFS interval and a duration of the xIFS interval is longer than a duration of the SIFS interval.

19 . The first wireless device of claim 17 , wherein the set of instructions when executed by the processor further causes the first wireless device to:

responsive to determining that the attempt to transmit the low latency data was unsuccessful, attempting to transmit the low latency data in a randomly selected subchannel following a SIFS interval after an end of a next fragmented multi-PPDU simultaneous transmission made by the second wireless device.

20 . The first wireless device of claim 17 , wherein the set of instructions when executed by the processor further causes the first wireless device to:

receive an acknowledgement (ACK) frame from the second wireless device in the randomly selected subchannel that acknowledges the low latency data.