Preemption / interruption of an ongoing low priority PPDU

Patent metadata

Field	Value
Publication number	US-12432778-B2
Application number	US-202217820454-A
Country	US
Kind code	B2
Filing date	Aug 17, 2022
Priority date	Sep 15, 2021
Publication date	Sep 30, 2025
Grant date	Sep 30, 2025

Abstract

A wireless local area network (WLAN) having stations (STAs) using Carrier Sense Multiple Access/Collision Avoidance (CSMA/CA) in which at least some stations support Full Duplex (FD) transmission. Mechanisms are described in which a STA can send a preemption request to a station performing ongoing transmissions. The preempted STA detects a preemption request of this preempting STA. The preempted STA interrupts its ongoing transmission; if it has determined to accept the preemption request. Thus, the preempting STA preempts the transmission of the preempted STA, to send a preemptive transmission, after receiving notification that the preempted STA has interrupted its ongoing transmission.

First claim

What is claimed is:

1. An apparatus for wireless communication in a network, the apparatus comprising:
(a) a wireless communication circuit, as a station (STA), wirelessly communicating over a channel with other STAs on a wireless local area network (WLAN) in an IEEE 802.11 protocol configured for supporting carrier sense multiple access/collision avoidance (CSMA/CA);
(b) a processor coupled to said STA;
(c) a non-transitory memory storing instructions executable by the processor for communicating with other STAs and fulfilling different roles of a communications protocol; and
(d) wherein said instructions, responsive to being executed by the processor, perform steps comprising:
(i) performing ongoing physical layer protocol data unit (PPDU) transmissions by said STA, which has full duplex (FD) capability and which incorporates a priority indication in its PPDU headers and which embeds punctured resources in each PPDU;
(ii) accessing the channel of said STA by a preempting STA, seeking to preempt the PPDU from said STA, wherein the channel is accessed by the preempting STA by counting down the backoff responsive to the preempting STA senses the channel is idle during the punctured resource of the PPDU of said STA, and under condition that the PPDU to be sent by said preempting STA has a higher priority than that of the PPDU being sent by said STA; wherein said preempting STA sends a preemption request to said first station;
(iii) receiving at said STA a preemption request by the preempting STA, and determining from information in the preemption request whether or not to accept the preemption request; and
(iv) interrupting ongoing transmissions by said STA which is now operating as a preempted STA responsive to said STA accepting the preemption request from the preempting STA, and thus said STA as the preempted STA allows the preempting STA to use the channel.

2. The apparatus of claim 1 , wherein the preempted STA has a punctured resource in its PPDU which can be utilized by the preempting STA for detecting third party transmissions.

3. The apparatus of claim 1 , wherein the preempted STA only accepts a preemption request from within its own basic service set (BSS).

4. The apparatus of claim 1 , wherein the preempted STA elects to reject the preemption request, and continues its ongoing transmissions.

5. The apparatus of claim 1 , wherein the preempted STA elects to interrupt its ongoing transmissions and also its receiving operations at the same time.

6. The apparatus of claim 1 , wherein the preempted STA elects to interrupt its ongoing transmissions but wait until after completing the transmission of a current medium access control service data unit (MSDU) or A-MSDU in the PPDU.

7. The apparatus of claim 1 , wherein the preempting STA sends a frame to launch its preemption transmission of the preempting STA.

8. The apparatus of claim 1 , wherein the preempting STA is only allowed to perform a preemption transmission during a transmit opportunity (TXOP) as obtained by the preempted STA.

9. The apparatus of claim 1 , further comprising:
(a) wherein said preempting STA has FD capability; and
(b) wherein the preempted STA transmits a PPDU to the preempting STA during a time when the preempting STA is transmitting the preemption transmission to the preempted STA.

10. The apparatus of claim 1 , wherein the preempted STA disables the preemption transmission during spatial reuse transmission.

11. The apparatus of claim 1 , wherein preempted STA disables the preemption transmission during a coordinated MAP transmission.

12. An apparatus for wireless communication in a network, the apparatus comprising:
(a) a wireless communication circuit, as a station (STA), wirelessly communicating over a channel with other STAs on a wireless local area network (WLAN) in an IEEE 802.11 protocol configured for supporting carrier sense multiple access/collision avoidance (CSMA/CA);
(b) a processor coupled to said STA;
(c) a non-transitory memory storing instructions executable by the processor for communicating with other STAs and fulfilling different roles of a communications protocol; and
(d) wherein said instructions, responsive to being executed by the processor, perform steps comprising:
(i) performing ongoing physical layer protocol data unit (PPDU) transmissions by said STA, which has full duplex (FD) capability and which incorporates a priority indication in its PPDU headers and which embeds punctured resources in each PPDU allowing a preempting STA to detect transmissions to other STAs;
(ii) accessing the channel of said STA by a preempting STA, seeking to preempt the PPDU from said STA, wherein the channel is accessed by the preempting STA by counting down the backoff responsive to the preempting STA senses the channel is idle during the punctured resource of the PPDU of said STA, and under condition that the PPDU to be sent by the preempting STA has a higher priority than that of the PPDU being sent by said STA; wherein the preempting STA sends a preemption request to said station;
(iii) receiving at said STA a preemption request from the preempting STA;
(iv) determining from information in the preemption request whether or not to accept the preemption request; and
(v) interrupting ongoing transmissions by said STA which is now operating as the preempted STA responsive to said STA accepting the preemption request from the preempting STA, and thus the preempted STA allows the preempting STA to use the channel.

13. The apparatus of claim 12 , wherein the preempted STA only accepts a preemption request from within its own basic service set (BSS).

14. The apparatus of claim 12 , wherein the preempted STA elects to reject the preemption request, and continues its ongoing transmissions.

15. The apparatus of claim 12 , wherein the preempted STA elects to interrupt its ongoing transmissions and also its receiving operations in accepting the preemption request.

16. The apparatus of claim 12 , wherein the preempted STA elects to interrupt its ongoing transmissions but wait until after completing the transmission of a current medium access control service data unit (MSDU) or A-MSDU in the PPDU.

17. The apparatus of claim 12 , wherein the preempting STA sends a frame to launch its preemption transmission of the preempting STA.

18. The apparatus of claim 12 , wherein the preempting STA is only allowed to perform a preemption transmission during a transmit opportunity (TXOP) as obtained by the preempted STA.

19. The apparatus of claim 12 , wherein the preempted STA disables the preemption transmission during spatial reuse transmission, or during a coordinated MAP transmission.

20. A method for performing wireless communication in a network, the method comprising:
(a) wirelessly communicating with other STAs, each having a channel, over which they communicate on a wireless local area network (WLAN) in an IEEE 802.11 protocol configured to allow different STAs to perform different roles during the communications which support carrier sense multiple access/collision avoidance (CSMA/CA);
(b) performing ongoing physical layer protocol data unit (PPDU) transmissions by a first STA, which has full duplex (FD) capability, having a PPDU header which includes a priority indication, and wherein the PPDU embeds punctured resources;
(c) accessing the channel of said first STA by a preempting STA, seeking to preempt the PPDU from said first STA, wherein the channel is accessed by the preempting STA by counting down the backoff responsive

Assignees

• Sony Group Corp
• Sony Corp America

Inventors

• Xin Liangxiao
• Abouelseoud Mohamed
• Sun Li-Hsiang
• Xia Qing

Classifications

• H04W84/12

  WLAN [Wireless Local Area Networks] · CPC title

• H04L5/0044

  Allocation of payload; Allocation of data channels, e.g. PDSCH or PUSCH · CPC title

• H04L5/14

  Two-way operation using the same type of signal, i.e. duplex · CPC title

• H04W74/0816 Primary

  with collision avoidance · CPC title

• H04W72/56 Primary

  based on priority criteria · CPC title