CN-122029794-A - Preemption techniques for low latency devices

Abstract

The present disclosure provides methods, components, devices, and systems for preemption techniques for low latency devices. Some aspects relate more particularly to preemption techniques for enabling transmission of low latency data. In some examples, an Access Point (AP) may transmit a first physical layer protocol data unit (PPDU) using a dedicated Resource Unit (RU) and a broadcast RU. The broadcast RU may indicate information for the preemption indication, such as resource units within the same transmit opportunity (TXOP) for the preemption indication. A wireless Station (STA) having pending low latency data may transmit a preemption indication via an RU indicated by a first PPDU. The preemption indication may indicate that a subsequently scheduled PPDU in the TXOP is to be preempted for the STA to send the PPDU and convey low latency data.

Inventors

• S.Y.D.He
• G. Cheryan
• A.P. Patil
• A. Astegadi
• NAIK GAAURI

Assignees

• 高通股份有限公司

Dates

Publication Date

20260512

Application Date

20240917

Priority Date

20231110

Claims (20)

1. 1. A first wireless communication device, the first wireless communication device comprising: a processing system comprising a processor circuit and a memory circuit storing code, the processing system configured to cause the first wireless communication device to: Receiving a first physical layer protocol data unit from a second wireless communication device, the first physical layer protocol data unit indicating an allocation of a first resource unit for a preemption indication associated with low latency data, wherein the allocation of the first resource unit is within a transmission opportunity associated with the second wireless communication device; Transmitting the preemption indication associated with low latency data via the first resource element indicated by the first physical layer protocol data unit based at least in part on low latency data information at the first wireless communication device, wherein transmission of the preemption indication is after the end of the first physical layer protocol data unit and before a scheduled start time of a second physical layer protocol data unit from the second wireless communication device, and And transmitting a third physical layer protocol data unit comprising the low-delay data information according to the preemption instruction, wherein the third physical layer protocol data unit preemptions the second physical layer protocol data unit in the transmission opportunity.
2. 2. The first wireless communication device of claim 1, wherein to receive the first physical layer protocol data unit, the processing system is configured to cause the first wireless communication device to: A trigger frame is received via a broadcast resource unit, the trigger frame indicating the allocation of the first resource unit for the preemption indication associated with low latency data, wherein the first physical layer protocol data unit comprises the broadcast resource unit and one or more dedicated resource units.
3. 3. The first wireless communication device of claim 2, wherein the processing system is further configured to cause the first wireless communication device to: the method further includes decoding signaling on the broadcast resource unit based at least in part on a wireless station identifier of the broadcast resource unit of the first physical layer protocol data unit.
4. 4. The first wireless communication device of claim 1, wherein the processing system is further configured to cause the first wireless communication device to: The first physical layer protocol data unit is decoded based at least in part on an association identifier associated with low latency data.
5. 5. The first wireless communication device of claim 1, wherein to send the preemption indication, the processing system is configured to cause the first wireless communication device to: Transmitting a signaling frame including the preemption indication, wherein transmitting the third physical layer protocol data unit is based at least in part on transmitting the signaling frame.
6. 6. The first wireless communication device of claim 1, wherein to send the preemption indication, the processing system is configured to cause the first wireless communication device to: Transmitting a trigger-based physical layer protocol data unit comprising a null aggregate Medium Access Control (MAC) protocol data unit delimiter, wherein transmitting the third physical layer protocol data unit is based at least in part on the trigger-based physical layer protocol data unit.
7. 7. The first wireless communication device of claim 1, wherein the processing system is further configured to cause the first wireless communication device to: the preemption indication is generated based at least in part on information indicated by the first physical layer protocol data unit.
8. 8. The first wireless communication device of claim 1, wherein the first physical layer protocol data unit sets a first Network Allocation Vector (NAV) for a first group of wireless communication devices that includes at least the first wireless communication device, and the third physical layer protocol data unit sets a second NAV for a second group of wireless communication devices that are not associated with low latency data.
9. 9. The first wireless communication device of claim 1, wherein the first physical layer protocol data unit sets a first Network Allocation Vector (NAV), and the processing system is further configured to cause the first wireless communication device to: A second NAV is set based at least in part on the transmission of the third physical layer protocol data unit.
10. 10. The first wireless communications device of claim 1, wherein the first physical layer protocol data unit indicates a second allocation of second resource units for a second preemption indication associated with a second type of traffic, and the first physical layer protocol data unit includes a traffic identifier, an access class, or a flow classification service identifier for the second type of traffic.
11. 11. The first wireless communications device of claim 1, wherein the first resource unit is a random access resource unit.
12. 12. The first wireless communications device of claim 11, wherein the random access resource unit is associated with a traffic class.
13. 13. The first wireless communication device of claim 1, wherein to send the preemption indication, the processing system is configured to cause the first wireless communication device to: the preemption indication is sent without performing a resource unit countdown, a listen-before-talk procedure, or a channel access countdown, or any combination thereof.
14. 14. A second wireless communication device, the second wireless communication device comprising: A processing system comprising a processor circuit and a memory circuit storing code, the processing system configured to cause the second wireless communication device to: transmitting a first physical layer protocol data unit comprising a broadcast resource unit and one or more dedicated resource units, wherein a trigger frame transmitted via the broadcast resource unit indicates an allocation of a first resource unit for a preemption indication associated with low latency data, and wherein the allocation of the first resource unit is within a transmission opportunity associated with the second wireless communication device; Receiving a preemption indication associated with low latency data from a first wireless communication device via the first resource element indicated by the trigger frame, wherein the receipt of the preemption indication is after the first physical layer protocol data unit ends and before a scheduling start time of a second physical layer protocol data unit from the second wireless communication device, and And receiving a third physical layer protocol data unit from the first wireless communication device and according to the preemption indication, wherein the third physical layer protocol data unit preempts the second physical layer protocol data unit within the transmission opportunity.
15. 15. The second wireless communication device of claim 14, wherein to transmit the first physical layer protocol data unit, the processing system is configured to cause the second wireless communication device to: one or more frames are transmitted to a third wireless communication device via the one or more dedicated resource units, wherein the one or more frames indicate a second allocation of a second resource unit for acknowledgement of the first physical layer protocol data unit.
16. 16. The second wireless communication device of claim 15, wherein the processing system is further configured to cause the second wireless communication device to: The acknowledgement of the first physical layer protocol data unit is received via the second resource unit.
17. 17. The second wireless communication device of claim 15, wherein: the first resource unit overlaps in time with the second resource unit.
18. 18. The second wireless communication device of claim 15, wherein a trigger-response scheduling control field in a medium access control header of a frame of the one or more frames indicates the second allocation of the second resource unit.
19. 19. The second wireless communication device of claim 15, wherein to transmit the first physical layer protocol data unit, the processing system is configured to cause the second wireless communication device to: transmitting, via the one or more dedicated resource units, a second one or more frames to a fourth wireless communication device, wherein the second one or more frames indicate a third allocation of a third resource unit for acknowledgement of the first physical layer protocol data unit.
20. 20. The second wireless communication device of claim 14, wherein to receive the preemption indication associated with low latency data, the processing system is configured to cause the second wireless communication device to: a plurality of preemption indications associated with low latency data are received, wherein each preemption indication of the plurality of preemption indications includes the same content.

Description

Preemption techniques for low latency devices Cross reference This patent application claims priority from U.S. patent application Ser. No. 18/506,563, entitled "PREEMPTION TECHNIQUES FOR LOW LATENCY DEVICES (preemption technique for Low latency devices)" filed by HO et al at 10 of 11 of 2023, which claims benefit from U.S. provisional patent application Ser. No. 63/591,340, entitled "PREEMPTION TECHNIQUES FOR LOW LATENCY DEVICES (preemption technique for Low latency devices)" filed by HO et al at 18 of 10 of 2023, each of which is assigned to the assignee of the present application and each of which is expressly incorporated herein by reference. Technical Field The present disclosure relates to wireless communications, and more particularly to preemption techniques for low latency devices. Description of related Art A Wireless Local Area Network (WLAN) may be formed of one or more wireless Access Points (APs) that provide a shared wireless communication medium for use by a plurality of client devices, also referred to as wireless Stations (STAs). The basic building block of WLANs conforming to the Institute of Electrical and Electronics Engineers (IEEE) 802.11 family of standards is the Basic Service Set (BSS) managed by an AP. Each BSS is identified by a Basic Service Set Identifier (BSSID) advertised by the AP. The AP periodically broadcasts beacon frames to enable any STA within wireless range of the AP to establish or maintain a communication link with the WLAN. In some WLANs, a transmit opportunity (TXOP) may be assigned to a device (e.g., an AP or STA). In some examples, one physical layer protocol data unit (PPDU) may be transmitted per TXOP. In such examples, if another device (such as an STA for an AP TXOP or an AP for an STA TXOP) identifies low latency traffic for transmission, the other device waits until the TXOP ends to transmit the low latency traffic, which may cause low latency data or traffic to be delayed. Disclosure of Invention The systems, methods, and devices of the present disclosure each have several innovative aspects, no single one of which is solely responsible for the desirable attributes disclosed herein. One innovative aspect of the subject matter described in this disclosure can be implemented in a method for wireless communication by a first wireless communication device. The method may include receiving a first physical layer protocol data unit from a second wireless communication device, the first physical layer protocol data unit indicating an allocation of a first Resource Unit (RU) for a preemption indication associated with low latency data, wherein the allocation of the first RU is within a transmission opportunity associated with the second wireless communication device, transmitting the preemption indication associated with low latency data via the first RU indicated by the first physical layer protocol data unit based on low latency data information at the first wireless communication device, wherein transmission of the preemption indication is after an end of the first physical layer protocol data unit and before a scheduled start time of a second physical layer protocol data unit from the second wireless communication device, and transmitting a third physical layer protocol data unit comprising the low latency data information according to the preemption indication, wherein the third physical layer protocol data unit preempts the second physical layer protocol data unit within the transmission opportunity. Another innovative aspect of the subject matter described in this disclosure can be implemented in a first wireless communication device for wireless communication. The first wireless communication device may include a processing system including a processor circuit and a memory circuit storing code. The processing system may be configured to cause the first wireless communication device to receive a first physical layer protocol data unit from a second wireless communication device, the first physical layer protocol data unit indicating an allocation of a first RU for a preemption indication associated with low latency data, wherein the allocation of the first RU is within a transmission opportunity associated with the second wireless communication device, transmit the preemption indication associated with low latency data via the first RU indicated by the first physical layer protocol data unit based on low latency data information at the first wireless communication device, wherein transmission of the preemption indication is after an end of the first physical layer protocol data unit and before a start time of scheduling of a second physical layer protocol data unit from the second wireless communication device, and preemption a third physical layer protocol data unit comprising the low latency data information according to the preemption indication, wherein the third physical layer protocol data unit preempts the second physical layer protocol data unit w