Wireless communication method and communication device

Abstract

A method and apparatus for wireless communication are provided. The method comprises the following steps: in a first TXOP, a first STA sends first uplink transmission to an AP; wherein the first STA reserves one or more frequency domain units in the first uplink transmission, the one or more frequency domain units are used for the second STA to report first indication information, and the first indication information is used for indicating that the second STA contains low-delay traffic to be transmitted and / or the second STA needs to preempt the first TXOP. The second STA can report the first indication information through one or more frequency domain units reserved by the first STA. Based on the first indication information, the second STA can preempt the first TXOP, thereby realizing timely transmission of low-delay traffic.

Description

Wireless communication method and communication device Technical Field

[0001] The present application relates to the field of communication technology, and more specifically, to a method and device for wireless communication. Background Art

[0002] Event-driven low-latency traffic is unpredictable and cannot be transmitted by pre-scheduling appropriate resources. Improving the transmission performance of latency-sensitive traffic is a problem that needs to be solved.

[0003] Summary of the Invention

[0004] The present application provides a wireless communication method and a communication device. The following introduces various aspects of the present application.

[0005] In a first aspect, a wireless communication method is provided. The method includes: within a first transmission opportunity (TXOP), a first station (STA) sends a first uplink transmission to an access point (AP); wherein the first STA reserves one or more frequency domain units in the first uplink transmission, the one or more frequency domain units being used for a second STA to report first indication information, the first indication information being used to indicate that the second STA has low-latency traffic to be transmitted and / or that the second STA needs to preempt the first TXOP.

[0006] In a second aspect, a wireless communication method is provided. The method includes: within a first TXOP, a second STA reports first indication information to an AP on one or more frequency domain units; wherein the one or more frequency domain units are frequency domain resources reserved by the first STA in a first uplink transmission, and the first indication information is used to indicate that the second STA has low-latency traffic to be transmitted and / or that the second STA needs to preempt the first TXOP.

[0007] According to a third aspect, a method for wireless communication is provided, comprising: within a first TXOP, an AP receives a first uplink transmission from a first STA; wherein, the first STA reserves one or more frequency domain units in the first uplink transmission, and the one or more frequency domain units are used for the second STA to report first indication information, and the first indication information is used to indicate that: the second STA contains low-latency traffic to be transmitted, and / or, the second STA needs to seize the first TXOP.

[0008] In a fourth aspect, a communication device is provided, which is a first STA, and the communication device includes: a sending unit, used to send a first uplink transmission to the AP within a first TXOP; wherein, the first STA reserves one or more frequency domain units in the first uplink transmission, and the one or more frequency domain units are used for the second STA to report first indication information, and the first indication information is used to indicate: the second STA contains low-latency traffic to be transmitted, and / or, the second STA needs to seize the first TXOP.

[0009] In the fifth aspect, a communication device is provided, which is a second STA, and the communication device includes: a reporting unit, used to report first indication information to the AP on one or more frequency domain units within the first TXOP; wherein, the one or more frequency domain units are frequency domain resources reserved by the first STA in the first uplink transmission, and the first indication information is used to indicate: the second STA contains low-latency traffic to be transmitted, and / or, the second STA needs to seize the first TXOP.

[0010] In the sixth aspect, a communication device is provided, which is an AP, and the communication device includes: a receiving unit, used to receive a first uplink transmission of a first station STA within a first TXOP; wherein, the first STA reserves one or more frequency domain units in the first uplink transmission, and the one or more frequency domain units are used for the second STA to report first indication information, and the first indication information is used to indicate: the second STA contains low-latency traffic to be transmitted, and / or, the second STA needs to seize the first TXOP.

[0011] In the seventh aspect, a communication device is provided, comprising a processor and a memory, wherein the memory is used to store one or more computer programs, and the processor is used to call the computer program in the memory so that the communication device executes part or all of the steps in the method of the first aspect.

[0012] In an eighth aspect, an embodiment of the present application provides a communication system, which includes the above-mentioned communication device. In another possible design, the system may also include other devices that interact with the communication device in the solution provided in the embodiment of the present application.

[0013] In a ninth aspect, an embodiment of the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and the computer program enables a communication device to execute part or all of the steps in the methods of the above aspects.

[0014] In a tenth aspect, embodiments of the present application provide a computer program product, wherein the computer program product includes a non-transitory computer-readable storage medium storing a computer program, wherein the computer program is operable to cause a communication device to perform some or all of the steps of the methods described in each of the above aspects. In some implementations, the computer program product may be a software installation package.

[0015] In the eleventh aspect, an embodiment of the present application provides a chip, which includes a memory and a processor. The processor can call and run a computer program from the memory to implement some or all of the steps described in the methods of the above aspects.

[0016] The second STA may report the first indication information through one or more frequency domain units reserved by the first STA. Based on the first indication information, the second STA may preempt the first TXOP, thereby achieving timely transmission of low-latency traffic. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] FIG1 is a schematic diagram of a wireless communication system used in an embodiment of the present application.

[0018] FIG2 is an example diagram of the cache status report polling trigger frame format.

[0019] FIG3 is an example diagram of the quality of service empty frame format.

[0020] FIG4 is an example diagram of the format of a null data physical layer protocol data unit feedback report polling trigger frame.

[0021] FIG5 is a diagram showing an example of the format of the element of the feedback parameter set of the null data physical layer transmission protocol data unit.

[0022] FIG6 is a diagram showing an example of a format of a null data physical layer protocol data unit based on efficient trigger feedback.

[0023] FIG7 is an example diagram of a low-latency transmission resource reservation solution based on puncturing.

[0024] FIG8 is an exemplary diagram of a solution for indicating low-latency data traffic based on overlapping physical layer protocol data units (PHY protocol data unit, PPDU).

[0025] FIG9 is an example diagram of frequency domain resources of a low-latency indication frame.

[0026] FIG. 10 is an exemplary diagram of a technical solution for transmitting a preemption request using a smaller interframe interval.

[0027] FIG. 11 is an example diagram of the transmission process of the strong preemption request corresponding to FIG. 10 .

[0028] FIG12 is a schematic flowchart of a wireless communication method provided in an embodiment of the present application.

[0029] FIG13 is a schematic diagram of a first trigger frame format provided in an embodiment of the present application.

[0030] FIG14 is a diagram showing an example of the format of a high-efficiency sounding null data physical layer protocol data unit (HE sounding NDP).

[0031] FIG15 is a diagram illustrating an example of an extremely high throughput sounding null data physical layer protocol data unit (EHT sounding NDP) format.

[0032] FIG16 is a diagram showing an example of the format of an ultra-reliable sounding null data physical layer protocol data unit (UHR sounding NDP).

[0033] Figure 17 is a schematic diagram of a second type of PPDU format provided in an embodiment of the present application.

[0034] FIG18 is a schematic diagram of the format of a second trigger frame provided in an embodiment of the present application.

[0035] FIG19 is a schematic diagram of the format of another second trigger frame provided in an embodiment of the present application.

[0036] Figure 20 is a schematic diagram of the format of another second trigger frame provided in an embodiment of the present application.

[0037] Figure 21 is a schematic diagram of the format of another second trigger frame provided in an embodiment of the present application.

[0038] Figure 22 is a schematic diagram of the format of another second trigger frame provided in an embodiment of the present application.

[0039] Figure 23 is a schematic diagram of the format of another second trigger frame provided in an embodiment of the present application.

[0040] Figure 24 is a schematic diagram of the format of the block confirmation frame provided in an embodiment of the present application.

[0041] Figure 25 is an example diagram of a wireless communication method provided in an embodiment of the present application.

[0042] Figure 26 is an example diagram of a wireless communication method provided in Example 1 of the present application.

[0043] Figure 27 is an example diagram of a wireless communication method provided in Example 2 of the present application.

[0044] Figure 28 is an example diagram of a wireless communication method provided in Example 3 of the present application.

[0045] Figure 29 is an example diagram of a wireless communication method provided in Example 4 of the present application.

[0046] Figure 30 is an example diagram of a wireless communication method provided in Example 5 of the present application.

[0047] Figure 31 is an example diagram of a wireless communication method provided in Example 7 of the present application.

[0048] Figure 32 is an example diagram of another wireless communication method provided in Example 7 of the present application.

[0049] Figure 33 is an example diagram of another wireless communication method provided in Example 7 of the present application.

[0050] Figure 34 is a schematic structural diagram of a communication device provided in an embodiment of the present application.

[0051] Figure 35 is a schematic structural diagram of another communication device provided in an embodiment of the present application.

[0052] Figure 36 is a schematic structural diagram of another communication device provided in an embodiment of the present application.

[0053] Figure 37 is a schematic structural diagram of a device for communication provided in an embodiment of the present application. DETAILED DESCRIPTION

[0054] The technical solution in this application will be described below with reference to the accompanying drawings.

[0055] Communication System

[0056] The technical solutions of the embodiments of the present application can be applied to various communication systems, such as wireless local area networks (WLAN), wireless fidelity (WiFi) or other communication systems.

[0057] 1 is a wireless communication system 100 used in an embodiment of the present application. The wireless communication system 100 may include an access point (AP) 110 and a station (STA) 120 accessing a network through the access point 110.

[0058] In some scenarios, an AP is also called an AP STA. In a sense, an AP is also a STA.

[0059] In some scenarios, a STA is also called a non-AP STA.

[0060] The communication in the communication system 100 can be communication between an AP and a STA, communication between STAs, or communication between a STA and a peer STA, where a peer STA may refer to a device that communicates with the STA peer, for example, a peer STA may be an AP or a STA.

[0061] An AP acts as a bridge between wired and wireless networks, connecting wireless network clients together and then connecting the wireless network to the Ethernet. An AP can be a terminal device with a WiFi chip (such as a mobile phone) or a network device (such as a router).

[0062] It should be understood that the role of STA in the communication system is not absolute. For example, in some scenarios, when a mobile phone is connected to a router, the mobile phone is a STA. When the mobile phone serves as a hotspot for other mobile phones, the mobile phone acts as an AP.

[0063] APs and STAs can be devices used in the Internet of Vehicles, IoT nodes and sensors in the Internet of Things (IoT), smart cameras, smart remote controls, smart water and electricity meters in smart homes, and sensors in smart cities.

[0064] In some embodiments, both the STA and the AP may support the 802.11be standard. The STA or AP may also support various current and future 802.11 family WLAN standards, such as 802.11ax, 802.11ac, 802.11n, 802.11g, 802.11b, and 802.11a.

[0065] There are one or more links between the station and the access point. In some embodiments, the station and the access point support multi-band communication. For example, communication is performed simultaneously on the 2.4 GHz, 5 GHz, 6 GHz, 45 GHz, and 60 GHz bands, or communication is performed simultaneously on different channels in the same band (or different bands), thereby improving the communication throughput and / or reliability between devices. Such a device is generally referred to as a multi-band device, or a multi-link device (MLD), sometimes also referred to as a multi-link entity or a multi-band entity. A multi-link device can be an access point device or a station device. If the multi-link device is an access point device, the multi-link device includes one or more APs; if the multi-link device is a station device, the multi-link device includes one or more non-AP STAs.

[0066] A multi-link device including one or more APs may be referred to as an access point multi-link device (AP MLD), and a multi-link device including one or more non-AP STAs may be referred to as a non-AP multi-link device (Non-AP MLD).

[0067] In an embodiment of the present application, the AP may include multiple APs, the Non-AP may include multiple STAs, multiple links may be formed between the APs in the AP and the STAs in the Non-AP, and data communication may be performed between the APs in the AP and the corresponding STAs in the Non-AP through the corresponding links.

[0068] In an embodiment of the present application, a STA may be a mobile phone, a tablet computer (Pad), a laptop computer, a PDA, a mobile internet device (MID), a wearable device, a virtual reality (VR) device, an augmented reality (AR) device, a wireless terminal in industrial control, a wireless terminal in self-driving, a wireless terminal in remote medical surgery, a wireless terminal in a smart grid, a wireless terminal in transportation safety, a wireless terminal in a smart city, a wireless terminal in a smart home, etc. that supports WLAN / WiFi technology.

[0069] The frequency bands supported by WLAN technology may include but are not limited to: low frequency bands (such as 2.4 GHz, 5 GHz, and 6 GHz) and high frequency bands (such as 45 GHz and 60 GHz).

[0070] FIG1 exemplarily shows an AP and two STAs. Optionally, the communication system 100 may include multiple APs and other numbers of STAs, which is not limited in the embodiments of the present application.

[0071] It should be understood that in the embodiments of the present application, a device having communication functionality in a network / system may be referred to as a communication device. Taking the communication system 100 shown in FIG1 as an example, the communication device may include an access point 110 and a station 120 having communication functionality. Access point 110 and station 120 may be the specific devices described above and will not be described in detail here. The communication device may also include other devices in the communication system 100, such as a network controller, a gateway, or other network entities, which is not limited in the embodiments of the present application.

[0072] APs and STAs can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; they can also be deployed on water; they can also be deployed in the air on aircraft, balloons, and satellites. The embodiments of this application do not limit the scenarios in which APs and STAs are located.

[0073] It should be understood that all or part of the functions of the communication device in this application can also be implemented through software functions running on hardware, or through virtualization functions instantiated on a platform (such as a cloud platform).

[0074] Uplink orthogonal frequency division multiple access-based random access (UORA) mechanism

[0075] The AP shall indicate the range of OFDMA contention window (OCW)in the UORA Parameter Set element for non-AP STAs to initiate random access following the Trigger frame transmission.

[0076] A non-AP high efficiency STA (Non-AP HE STA) should maintain an internal OCW and an internal orthogonal frequency division multiple access (OFDMA) random access backoff (OBO) counter. min to OCW max A non-AP HE STA shall maintain an internal OCW and an internal OBO counter. OCW is an integer in the range OCW min to OCW max .)

[0077] The size of all RA-RUs in the set shall be the same and equal to the size of the RA-RU indicated by the RU Allocation subfield in the User Info field. A non-AP HE STA shall determine the total number of eligible RA-RUs in a contiguous set from the Number Of RA-RU subfields (see Table 9-92 (RA-RU Information subfield format (11ax))) in the User Info field corresponding to an eligible RA-RU, excluding RA-RUs that are not within its operating bandwidth.

[0078] If an HE STA has a pending frame for the AP upon the reception of a Trigger frame containing at least one eligible RA-RU and if the OBO counter of an HE STA is not greater than the number of eligible RA-RUs in a Trigger frame from that AP,then the HE STA shall set its OBO counter to zero and randomly select one of the eligible RA-RUs to be considered for transmission. Otherwise, the HE STA decrements its OBO counter by the number of eligible RA-RUs in the Trigger frame.

[0079] For HE STA or HE AP, the maximum RU type and quantity that can be used under each channel bandwidth (CBW) are shown in Table 1.

[0080] Table 1

[0081] For an extremely high throughput (EHT) STA or EHT AP, the maximum number and type of RUs that can be used under each CBW are shown in Table 2 below. The tone plan for EHT at 80 MHz is different from that for HE.

[0082] Table 2

[0083] It should be noted that the tone in this application can also be called a subcarrier, that is, the tone and the subcarrier can be replaced with each other.

[0084] Buffer Status Report (BSR)

[0085] The AP sends BSR polling (BSRP) trigger frames to obtain buffer status reports from multiple STAs. The STA indicates the amount of data in the buffer queue corresponding to at least one of its traffic identifiers (TIDs) in the QoS Control field of at least one frame (e.g., a Quality of Service (QoS) Null frame) included in the physical layer protocol data unit (PPDU) to which it can respond. The STA also indicates the amount of data in the buffer queue corresponding to at least one of its access categories (ACs) in the Buffer Status Report Control (BSR Control) subfield of the Aggregate Control (A-Control) subfield of the High-Efficiency (HE) variant of the High Throughput (HT) Control field in at least one QoS Null frame.

[0086] For example, the BSRP trigger frame can be shown in Figure 2, where the general information field in the BSRP trigger frame includes the following fields: trigger frame type (=4) (occupies 4 bits), uplink length (occupies 12 bits), whether there are more trigger frames (occupies 1 bit), whether channel measurement is required (occupies 1 bit), uplink bandwidth (occupies 2 bits), guard interval (GI) and high efficiency long training field (HE-LTF) type / triggered transmission opportunity sharing mode (occupies 2 bits), number of HE-LTF symbols and midamble period (occupies 3 bits), low-density parity check (LDPC) additional symbol segmentation (occupies 1 bit), AP transmit power (occupies 6 bits), pre-forward error correction (Pre-FEC) filling factor (occupies 2 bits), packet extension (PE) disambiguation (occupies 1 bit), uplink spatial multiplexing (occupies 16 bits), HE / EHT primary 160 (occupies 16 bits), and HE / EHT primary 160. 160, P160) (occupies 1 bit), special user information field identifier (occupies 1 bit), EHT reserved (occupies 7 bits).

[0087] For example, a QoS Null frame may be shown in FIG3 , wherein the media access control (MAC) header in the QoS Null frame includes a QoS control field and an HT control field. The QoS control field includes the following fields: traffic identifier (TID) (occupies 4 bits), end of service period (EOSP) (=1) (occupies 1 bit), acknowledgment policy indicator (Ack Policy Indicator) (occupies 2 bits), and queue size (Queue Size) (occupies 8 bits). The HT control field includes the following fields: very high throughput (VHT) (occupies 1 bit), HE (occupies 1 bit), and aggregation control (occupies 30 bits). The control list field in the aggregation control field includes a control information (BSR control) field, and the control information (BSR control) field includes the following fields: access category index (ACI) bitmap (ACI bitmap), variable flow identifier (delta TID), high priority access type (ACI High), scaling factor (Scaling Factor), high priority queue size (Queue Size High), and all queue sizes (Queue Size All).

[0088] Null data physical protocol data unit feedback report (NFR)

[0089] The access point sends a null data physical protocol data unit feedback report polling (NFRP) trigger frame to obtain null data physical protocol data unit feedback from multiple stations. After receiving the NFRP trigger frame, the station transmits an NDP (or high efficiency trigger based feedback null data physical protocol data unit, HE TB feedback NDP) in response. When the number of bytes of buffered data is greater than or equal to the resource request buffer threshold (RRB threshold) indicated by the access point, the station's feedback status (FEEDBACK_STATUS) (the transmission variable used to modulate the subcarriers of the long training field (LTF) of the NDP) is 1; otherwise, the station's FEEDBACK_STATUS is 0. The resource request cache threshold is previously indicated by the access point in an empty data physical layer transmission protocol data unit feedback parameter set (NDP Feedback Report Parameter Set) element in a beacon frame and / or a probe response frame and / or an association response frame and / or a reassociation response frame, or if no such indication is received, the resource request cache threshold is a default value of 256 bytes.

[0090] Specifically, the NFRP trigger frame can be shown in Figure 4; wherein the general information field includes the following fields: trigger frame type (=4) (occupying 4 bits), uplink length (occupying 12 bits), whether there are more trigger frames (occupying 1 bit), whether channel measurement is required (occupying 1 bit), uplink bandwidth (occupying 2 bits), GI and HE-LTF type (=2) (occupying 2 bits), multiple users multiple-in multiple-out (MU-MIMO) HE-LTF mode (occupying 1 bit), HE-LTF symbol number and intermediate code period (=1) (occupying 3 bits), AP transmit power (occupying 6 bits), uplink high efficiency signal field A2 (high efficiency-SINGAL field-A2, HE-SIG-A2) reserved (occupying 9 bits); wherein the user information list field includes the following fields: starting association identifier (association identifier, AID), feedback type, uplink target received power, and number of spatially multiplexed users.

[0091] The NDP Feedback Report Parameter Set element may be as shown in Figure 5. The Resource Request Buffer Threshold Exponent field is used to calculate the buffer threshold between two different resource requests as defined in 26.5.7.4 (NDP feedback report for a resource request). The resource request buffer threshold value is equal to 2 (Resource Request Buffer Threshold Exponent) octets.

[0092] If the AP does not carry the NDP Feedback Report Parameter Set element in any frame it sends, the resource request buffer threshold is equal to 256 octets. (The resource request buffer threshold is equal to 256 octets if no NDP Feedback Repot Parameter Set element is sent by the AP.)

[0093] The HE TB feedback NDP format is shown in Figure 6. The HE TB feedback NDP includes the following fields: legacy short training field (L-STF), legacy long training field (L-LTF), legacy signal (L-SIG), repeat legacy signal (RL-SIG), high efficiency signal A (HE-SIG-A), high efficiency short training field (HE-STF), high efficiency long training field (HE-LTF), and packet extension (PE). As shown in Figure 6, two HE-LTF symbols of 4x HE-LTF type are used, each symbol is 16μs (2 HE-LTF symbols with 16μs per symbol using 4x HE-LTF).

[0094] The NDP format uses the high-efficiency trigger-based PPDU (HE TB PPDU) format, but without the data field. The PE field duration is 0 microseconds (μs), there are two 4x HE-LTF symbols, and the guard interval (GI) used is 3.2 μs. Among them, the duration of 1x HE-LTF symbol is 3.2 μs, the duration of 2x HE-LTF symbol is 6.4 μs, and the duration of 4x HE-LTF symbol is 12.8 μs. The guard interval is not included in the duration.

[0095] The different RU tone set indexes (RU_TONE_SET_INDEX) in the HE-LTF field are used to identify the AIDs and feedback information (FEEDBACK_STATUS) of different Non-AP STAs. Specifically, the HE-LTF subcarrier mapping relationship in the HE TB feedback NDP can be as shown in Table 3.

[0096] Table 3

[0097] When the Number of Spatially Multiplexed Users field in the NFRP trigger frame is 0, each RU_TONE_SET_INDEX corresponds to one non-AP STA (AID). When the bandwidth is 20 MHz, for a non-AP STA using RU_TONE_SET_INDEX = 1, the feedback information FEEDBACK_STATUS = 1 corresponds to the HE-LTF subcarriers –113, –77, –41, 6, 42, and 78 having energy, while all other subcarriers have no energy. The feedback information FEEDBACK_STATUS = 0 corresponds to the HE-LTF subcarriers –112, –76, –40, 7, 43, and 79 having energy, while all other subcarriers have no energy. When the bandwidth is 40 MHz or 80 MHz, the 20 MHz subcarrier mapping is expanded by 1 and 3 times, respectively, to allow for mapping of more non-AP STAs (AIDs). The starting association identifier in the NFRP Trigger frame corresponds to the RU_TONE_SET_INDEX value of 1. For example, if the starting association identifier is 6, the non-AP STA with an AID value of 6 corresponds to the RU_TONE_SET_INDEX value of 1, the non-AP STA with an AID value of 7 corresponds to the RU_TONE_SET_INDEX value of 2, and so on.

[0098] When the Number of Spatially Multiplexed Users field in the NFRP Trigger frame is 1, each RU_TONE_SET_INDEX corresponds to two non-AP STAs (AIDs), which are distinguished by different pre-assigned precoding matrices. The starting association identifier in the NFRP Trigger frame corresponds to a RU_TONE_SET_INDEX value of 1. For example, if the starting association identifier is 6, the two non-AP STAs with AID values ​​of 6 and 7 correspond to a RU_TONE_SET_INDEX value of 1, the two non-AP STAs with AID values ​​of 8 and 9 correspond to a RU_TONE_SET_INDEX value of 2, and so on.

[0099] The transmission of event-driven (also known as non-predictable or difficult to predict) low-latency (LL) traffic can be achieved through the following technical solutions.

[0100] Reserve resources for low-latency transmission

[0101] In this technical solution, a method similar to preamble puncturing can be used to reserve resources for low-latency transmission.

[0102] For example, in order to process low-latency traffic in a way that does not cause conflict or interference and does not have to wait for the transmission opportunity of another station, the following scheduling method can be used: allocate resources under specific conditions and indicate the resource allocation information. As shown in Figure 7, the AP can indicate in its working bandwidth whether its sub-channel is punctured or non-punctured. Low-latency traffic can be scheduled to be transmitted in a punctured channel, and non-low-latency (non-LL) traffic can be scheduled to be transmitted in a non-punctured channel. In other words, a determined punctured channel can be used for the transmission of event-driven low-latency traffic, thereby avoiding conflicts with non-low-latency traffic being transmitted.

[0103] Design overlapping PPDUs to indicate low-latency traffic

[0104] When a STA has low-latency data to transmit, it can send a low-latency indication frame (indicated by LL_IF). The low-latency indication frame can be transmitted in an overlapping manner with the ongoing uplink transmission.

[0105] As shown in Figure 8, the TXOP holder is the AP, and the TXOP responder is STA1. A trigger frame (TF) indicates that the LL-IF is ready for transmission. When STA1 sends a trigger-based PPDU (TB-PPDU), STA2 sends an LL_IF overlapping the TB-PPDU to preempt the TXOP. Upon receiving the LL_IF, the AP instructs STA2 to transmit low-latency data (represented by LL data in Figure 8).

[0106] The low-latency indication frame may be designed as a simple binary phase shift keying (BPSK) sequence, which is mapped to part of the subcarriers being transmitted (eg, a small RU) and part of the OFDM symbols during transmission.

[0107] As shown in Figure 9, for an ongoing PPDU, the frequency domain resources of the low latency indication frame (LL-IF) can overlap with the PPDU. As shown in the right half of Figure 9, the LL_IF overlaps with the 26-tone RU and the reserved tones of the ongoing PPDU. The format of the low latency indication frame can be shown in the left half of Figure 9. The low latency indication frame shown in Figure 9 meets the following requirements: P4 repeated 6 times; 4 OFDM symbols; 24 active subcarriers; mapped into data; subcarriers of 26-tone RU.

[0108] Use a smaller interframe spacing to transmit preemption requests

[0109] The access point divides the longer downlink PPDU into multiple shorter PPDUs and transmits them continuously with an interframe space (xIFS) of x (where x represents undetermined information. For example, xIFS can be PIFS). The preamble of the first short PPDU indicates whether the transmission within a certain period of time (for example, the duration of this transmission) can be preempted. If preemption is possible, other stations with low-latency traffic to be transmitted (for example, STA2, STA3) can use an interframe space (Tp) shorter than xIFS to transmit a preemption request (PR) to the access point, thereby interrupting the access point's downlink transmission.

[0110] As shown in Figure 10, the AP is the TXOP holder. The AP can divide a longer PPDU into multiple downlink PPDUs (DL PPDUs) as shown in Figure 10, and transmit the multiple downlink PPDUs continuously with xIFS. In the preamble of the downlink PPDU, the preemption bit can be used to indicate whether the downlink transmission can be preempted. For example, when the preemption bit = 1, the STA can use the interframe space Tp (less than xFIS) to transmit PR. If a STA transmits a PR, the AP's downlink transmission is interrupted; if no STA transmits a PR, the AP's downlink transmission will not be interrupted.

[0111] The following uses Figure 11 as an example to illustrate the preemption request transmission process. As shown in Figure 11, LL traffic arrives at both STA2 and STA3 for the AP. Therefore, both STA2 and STA3 transmit PRs using a Tp. Because the AP receives the PR, its downlink data transmission is suspended. However, since LL traffic arrives at the AP for STA2, the AP transmits a downlink LL PPDU to STA2. After the downlink LL PPDU is transmitted, the AP can send a TF to STA2 and STA3, allowing them to transmit their respective LL PPDUs.

[0112] In related technologies, there are many problems with the transmission of low-latency traffic.

[0113] Taking the technical solution of reserving resources for low-latency traffic transmission as an example, since low-latency traffic is difficult or unpredictable, reserving resources that match low-latency traffic is relatively difficult. For example, reserving too many resources can easily lead to resource waste; reserving too few resources may result in only a small number of sites being able to complete low-latency data transmission after UORA competition. In addition, when a site uses MU PPDU single-user transmission (SU transmission) in the uplink, other sites cannot predict the length of the MU PPDU, making it difficult to achieve alignment with the MU PPDU when transmitting low-latency traffic.

[0114] Taking the technical solution involving overlapping PPDUs indicating low-latency data as an example, the overlapping PPDUs may interfere with the PPDU being transmitted, thereby affecting the reliability of the transmission.

[0115] For example, using a smaller interframe interval to transmit a preemption request only addresses the issue of preempting the access point's downlink transmission, not the issue of preempting the station's uplink transmission. Furthermore, transmissions from other stations (e.g., OBSS stations) or other systems may occur within the xIFS duration, causing the access point's downlink transmission to be mistakenly preempted. Furthermore, transmitting a preemption request increases system load and overall latency.

[0116] FIG12 is a schematic flow chart of a wireless communication method provided by an embodiment of the present application to solve the above problem. The method shown in FIG12 can be performed by a first STA and an AP. The method shown in FIG12 can include step S1210.

[0117] Step S1210: In a first TXOP, a first STA sends a first uplink transmission to an AP.

[0118] The first TXOP may be acquired by the first STA or the AP. That is, the holder of the first TXOP may be the first STA or the AP. If the holder of the first TXOP is the AP, the first STA may be the responder of the first TXOP.

[0119] The first uplink transmission may include transmission by the first STA for one or more of the following: a data frame, a management frame, and a control frame.

[0120] In some embodiments, the first uplink transmission may be an uplink response or uplink confirmation to a downlink transmission (e.g., a data frame and / or a management frame) performed by the AP after acquiring the TXOP. For example, the uplink response or uplink confirmation may be performed via a management frame and / or an acknowledgement (Ack) frame and / or a block acknowledgement (BA) frame.

[0121] The first STA may reserve one or more frequency domain units in the first uplink transmission. One or more frequency domain units may be used by the second STA to report the first indication information. The first indication information may be used to indicate that the second STA contains low-latency traffic to be transmitted, and / or that the second STA needs to preempt the first TXOP. The second STA may be another STA belonging to the same network as the first STA. It is understandable that the second STA may be any STA different from the first STA. Alternatively, the operations of other STAs different from the first STA in the same network may refer to the second STA.

[0122] The frequency domain unit may include an RU and / or a subchannel (e.g., a 20 MHz subchannel). If the frequency domain unit is an RU, and the first STA reserves multiple RUs, the multiple RUs may be located in multiple subchannels. The multiple subchannels may be continuous or discontinuous. For example, multiple RUs may form a complete subchannel (e.g., a 20 MHz subchannel).

[0123] When the frequency domain unit is RU, frequency domain resources can be reserved at RU granularity. Compared with frequency domain resource reservation at subchannel or channel granularity, the resource reservation granularity is smaller, the resource waste is smaller, and the frequency domain resources can be more fully utilized.

[0124] Low-latency traffic may refer to traffic identified by a restricted target wake time traffic identifier (R-TWT TID) or a stream classification service identifier (SCS ID). Low-latency traffic may be event-driven. For example, low-latency traffic may include one or more of the following: traffic generated by user instant messaging interactions, traffic generated by sensors.

[0125] Non-low-latency traffic may refer to traffic that is neither identified by an R-TWT TID nor by an SCS ID.

[0126] It should be noted that "low-latency traffic" is merely an exemplary representation. In some embodiments, low-latency traffic may also be referred to as low-latency data, delay-sensitive data, delay-sensitive traffic, etc.

[0127] As described above, the first indication information can be used to indicate that the second STA contains low-latency traffic to be transmitted. In other words, the first indication information can be used to indicate that one or more STAs contain low-latency traffic to be transmitted. Therefore, the first indication information can also be called a low-latency indication (LL indication).

[0128] Optionally, the method shown in Figure 12 may further include step S1220. Step S1220 may be performed by the second STA and the AP.

[0129] Step S1220: The second STA reports first indication information to the AP.

[0130] For example, if the second STA has low-latency traffic exceeding x, the second STA may indicate to the AP through first indication information that the second STA has low-latency traffic to be transmitted, or that the second STA needs to preempt the first TXOP to transmit the low-latency traffic. Where x can be an integer greater than or equal to 0. When x is 0, if low-latency traffic arrives at the first STA, the second STA may report the first indication information.

[0131] After receiving the first indication information, the AP may allocate resources to the second STA so that the second STA can transmit low-latency traffic. The resources may include one or more of the following: time domain resources, frequency domain resources, and spatial domain resources.

[0132] The first indication information is reported on one or more frequency domain units reserved for the first uplink transmission. That is, when the first STA sends the first uplink transmission, it can reserve one or more frequency domain units and not perform uplink transmission. For the second STA, the first indication information can be reported on the reserved one or more frequency domain units. In other words, the first uplink transmission and the first indication information can occupy the same time domain resources, or the time domain resources occupied by the first uplink transmission and the first indication information partially or completely overlap, and the frequency domain resources of the first uplink transmission and the first indication information are not overlapping. Therefore, there will be no interference between the first uplink transmission and the first indication information, thereby avoiding the impact of interference on transmission reliability and reducing the total system delay.

[0133] The size of the first indication information is predictable. For example, all STAs can report the same first indication information, or a limited number of STAs can report different first indication information. Therefore, the resources reserved for reporting the first indication information are also predictable or determinable. In other words, compared with reserving resources for unpredictable low-latency traffic, reserving resources for the first indication information does not involve the problem of resource waste caused by excessive reservations or the inability to complete low-latency traffic transmission due to insufficient reservations.

[0134] In addition, compared with low-latency traffic, the first indication information is shorter. Therefore, the present application can avoid the problem of misalignment with the MU PPDU when the site uplink uses MU PPDU single-user transmission.

[0135] In some embodiments, the first indication information may not distinguish between specific STAs. In other words, the first indication information indicates that one or more of the multiple STAs associated with the AP contain low-latency traffic to be transmitted and / or that one or more of the multiple STAs associated with the AP need to preempt the first TXOP. Multiple STAs can report the same first indication information.

[0136] When the first indication information does not distinguish between specific STAs, resource reservation can be minimized. For example, the first STA can reserve only a subchannel with a bandwidth of 20MHz, or a 26-channel resource unit, to meet the needs of multiple STAs reporting low latency indications and / or indications of the need to preempt TXOPs.

[0137] It can be understood that when the first indication information does not distinguish between specific STAs, after receiving the first indication information, the AP can determine that other STAs other than the first STA contain low-latency traffic to be transmitted, and / or other STAs need to seize the first TXOP; however, the AP cannot know which STA or STAs contain low-latency traffic to be transmitted, and / or which STA or STAs need to seize the first TXOP based on the first indication information.

[0138] In some embodiments, after receiving the first indication information, the AP can further determine the low-latency traffic information. The low-latency traffic information may include: which specific STA or STAs have low-latency traffic to be transmitted and / or the data volume of the low-latency traffic of each STA. For example, the AP can determine the cache status of each STA through the BSR and / or NFR technology described above, thereby determining which specific STAs have low-latency traffic to be transmitted and / or the data volume of low-latency traffic. Exemplarily, in combination with the technical solution described above, the transmission process of low-latency traffic can be divided into three steps: the first step, based on the first indication information, the access point determines whether there is a site with low-latency traffic to be transmitted; the second step, the access point obtains specific low-latency traffic information; the third step, the site transmits low-latency traffic.

[0139] In some implementations, all stations can use the same first indication information. That is, the first indication information is used to indicate that one or more of the total number of STAs contains low-latency traffic to be transmitted and / or that one or more of the total number of STAs needs to preempt the first TXOP. The total number of STAs may be all STAs associated with the AP. Alternatively, the total number of STAs may be all STAs belonging to the same network as the first STA. In this implementation, upon receiving the first indication information, the AP may determine that there is a STA among the total number of STAs that requires low-latency traffic transmission and / or requires preempting a TXOP.

[0140] For example, when the AP can obtain at one time which STAs among all sites have low-latency traffic to be transmitted and / or the amount of low-latency traffic data, all sites can use the same first indication information. For example, when the current working bandwidth is 80 MHz and the total number of STAs does not exceed 36, the AP can allocate at least one 26-channel resource unit to each STA in the BSRP to obtain the cached data volume of all sites. Therefore, when the current working bandwidth is 80 MHz and the total number of STAs does not exceed 36, all sites can use the same first indication information.

[0141] In some implementations, all STAs can be divided into one or more STA groups, and stations in the same STA group can transmit the same first indication information. For example, one or more STA groups can include a first STA group, and the first STA group can include a second STA. The first indication information can be used to indicate that one or more STAs in the first STA group contain low-latency traffic to be transmitted, and / or one or more STAs in the first STA group need to seize the first TXOP. In this implementation, the AP can obtain whether the STAs in one or some STA groups among all STAs have low-latency traffic transmission requirements and / or the need to seize TXOP. Compared with the technical solution in which all stations use the same first indication information, the AP can narrow the range of STAs that have low-latency traffic transmission requirements and / or the need to seize TXOP based on grouping, that is, exclude some or all STAs that do not have low-latency traffic transmission requirements and / or the need to seize TXOP.

[0142] For example, if the AP cannot obtain all STAs at once which STAs have low-latency traffic to transmit and / or the amount of low-latency traffic data to transmit, the first indication information can be transmitted by STA group. For example, if the current operating bandwidth is 80 MHz and the total number of STAs exceeds 36, all sites can be grouped, and STAs in the same STA group can use the same first indication information.

[0143] It is understood that the technical solution of using the same first indication information for all stations is relatively simple to implement. The technical solution of indicating the first indication information in a grouped manner can exclude some or all STAs that do not require low-latency traffic transmission and / or preempt TXOPs, thereby reducing the number of STAs that the AP needs to obtain cached data from, thereby reducing the transmission overhead when the AP obtains STA cached data, and reducing the transmission load.

[0144] In the case where multiple STAs are divided into one or more STA groups, the AP can indicate the grouping situation.

[0145] In some embodiments, the grouping status may be indicated by a first trigger frame. For example, the AP may send a first trigger frame to the first STA and / or the second STA to inform the first STA and / or the second STA of the grouping status.

[0146] In some embodiments, the access point may announce the grouping status in advance. For example, the access point may announce the grouping status in a beacon frame and / or in a newly defined action frame.

[0147] The grouping status may include one or more of the following information: the number of STAs in the first STA group, the number of one or more STA groups, and the minimum association identifier of multiple STAs. The number of STAs in the first STA group may also be indicated by the number of STAs belonging to the same STA group. The number of one or more STA groups may be the total number of groups. The total number of groups may be indicated by the modulus of the grouping.

[0148] The first trigger frame may include a first field. The first field may be used to indicate the number of STAs in the first STA group and / or the number of one or more STA groups. In some embodiments, the first field may also be included in a beacon frame and / or a newly defined action frame.

[0149] The first trigger frame may include a second field. The second field may be used to indicate the smallest association identifier of multiple STAs. In some embodiments, the second field may also be included in a beacon frame and / or a newly defined action frame.

[0150] The first field and the second field may both belong to the third field. The third field may be a newly added field in the first trigger frame. For example, the third field may be the special user information 2 field.

[0151] Figure 13 is a schematic diagram of a first trigger frame format provided by an embodiment of the present application. In Figure 13, the present application adds a special user information 2 field marked with gray fill.

[0152] In FIG13 , the first field is a grouping factor field (grouping factor), the second field is a starting association identifier (Starting AID) field, and the third field is a special user information 2 field.

[0153] The starting association identifier field may indicate the smallest association identifier value among the preemptive stations that can participate in this transmission opportunity (ie, the first TXOP).

[0154] The grouping factor field may indicate the number of sites belonging to the same group, or the grouping modulus.

[0155] Taking the example of the grouping factor field indicating the number of stations belonging to the same group, the number of stations in the same group can be the value of the grouping factor + 1. In this case, the number of stations included in one group (for example, the last group) may be less than the number indicated by the grouping factor. For example, when the starting association identifier is 3, if the grouping factor is 0, there is only one station in the same group (i.e., STAs with identifiers 3, 4, 5, etc. each form a group). For another example, when the starting association identifier is 3, if the grouping factor is 1, there are two stations in the same group (i.e., STAs with identifiers 3 and 4 form a group, STAs with identifiers 5 and 6 form a group, and so on).

[0156] For example, if the Grouping Factor field indicates the grouping modulus (or the total number of groups), then sites whose association identifiers differ from the starting association identifier by the modulus that is congruent to the starting association identifier may be grouped together. In this case, the number of sites in each group may be different. For example, if the starting association identifier is 3 and the grouping modulus is 7, then sites 3, 10, 17, and so on, may be grouped together, while sites 4, 11, 18, and so on, may be grouped together.

[0157] The uplink target receive power (UL Target Receive Power) field may be used to indicate the receive power that the access point expects to be measured when receiving the first indication information.

[0158] The Number Of Spatially Multiplexed Users field can be used to indicate on how many streams the first indication information is sent. For example, 0 indicates one stream, and 1 indicates two streams. When two streams are indicated, the site can determine on which stream to send the first indication information based on the difference between its own association identifier and the starting association identifier. For example, if the starting association identifier is 3, the first indication information is sent on the first stream if the site association identifier is 3, on the second stream if the site association identifier is 4, on the first stream if the site association identifier is 5, on the first stream if the site association identifier is 6, on the second stream if the site association identifier is 6, and so on.

[0159] The following describes a method for reporting the first indication information.

[0160] In some embodiments, the first indication information may be reported via an NDP. For example, when the reserved one or more frequency domain units are one or more 20 MHz sub-channels, the first indication information may be reported via an NDP.

[0161] In some embodiments, the first indication information may be reported via a high efficiency trigger based NDP (HE TB feedback NDP).

[0162] When the HE TB feedback NDP is used to report the first indication information, the HE-LTF field can be mapped to RU_TONE_SET_INDEX so that one RU_TONE_SET_INDEX can correspond to one STA group or one STA. In the mapping of the related art, each AID corresponds to a group of subcarriers when the feedback information (FEEDBACK_STATUS) is 0, and corresponds to another group of subcarriers when the feedback information (FEEDBACK_STATUS) is 1. In this application, a station without low-latency traffic does not need to transmit the NDP, that is, there is no need to use the 0 value of the feedback information (FEEDBACK_STATUS). Therefore, the subcarrier corresponding to it can be used for the 1 value of the feedback information (FEEDBACK_STATUS) corresponding to other AIDs.

[0163] For example, if the starting association identifier is 6, as described above, the subcarrier groups {–113,–77,–41,6,42,78} and {–112,–76,–40,7,43,79} in the 20 MHz bandwidth in the NFR correspond to feedback information values ​​of 1 and 0, respectively, for the station with AID 6.

[0164] For another example, in this solution, if a station is a STA group, the values ​​of feedback information 1 of stations with AIDs 6 and 7 can be changed to {–113,–77,–41,6,42,78} and {–112,–76,–40,7,43,79}, respectively, and so on.

[0165] For another example, in this solution, if two stations form an STA group, the feedback information 1 value of the stations can be changed to {–113,–77,–41,6,42,78} and {–112,–76,–40,7,43,79} corresponding to two groups of stations respectively (for example, AIDs 6, 7, 8, and 9 are one STA group, and AIDs 10, 11, 12, and 13 are another STA group), and so on.

[0166] It should be noted that, when all sites transmit the same first indication information, the NDP reporting the first indication information can include not only the HE TB feedback NDP. The first indication information can be reported through one or more of the following NDPs: high efficiency sounding NDP (HE sounding NDP), extremely high throughput sounding NDP (EHT sounding NDP), and ultra high reliability sounding NDP (UHR sounding NDP). That is, the LTF field does not need to perform the above-mentioned RU_TONE_SET_INDEX mapping. Among them, the LTF field may include one or more of the following: HE-LTF field, EHT-LTF field, and UHR-LTF field.

[0167] Figure 14 is an example diagram of the HE sounding NDP format. As shown in Figure 14, the HE sounding NDP may include the legacy short training field (L-STF), the legacy long training field (L-LTF), the legacy signal field (L-SIG), the repeated legacy signal field (RL-SIG), the uplink high-efficiency signal field A (HE-SIG-A), the high-efficiency short training field (HE-STF), the high-efficiency long training field (HE-LTF), and the packet extension (PE).

[0168] Figure 15 is an example of the EHT sounding NDP format. As shown in Figure 15, the EHT sounding NDP may include: legacy short training field (L-STF), legacy long training field (L-LTF), legacy signal field (L-SIG), repeated legacy signal (RL-SIG), universal signal field (U-SIG), extremely high throughput signal field (EHT-SIG), extremely high throughput short training field (EHT-STF), extremely high throughput long training fields (EHT-LTFs), and packet extension (PE).

[0169] Figure 16 is an example of a possible UHR sounding NDP format. As shown in Figure 16, the UHR sounding NDP may include: legacy short training field (L-STF), legacy long training field (L-LTF), legacy signal field (L-SIG), repeated legacy signal (RL-SIG), universal signal field (U-SIG), ultra high reliability signal field (UHR-SIG), ultra high reliability short training field (UHR-STF), ultra high reliability long training fields (UHR-LTFs), and packet extension (PE).

[0170] It should be noted that Figures 14 to 16 are only examples. The corresponding NDP format may include some or all of the fields shown in the figures, or the NDP may also include other fields.

[0171] In some embodiments, the first indication information may be transmitted via a second type of PPDU. For example, the first indication information may be carried in an LTF field in a preamble of the second type of PPDU. The second type of PPDU may be a newly defined PPDU.

[0172] Figure 17 is a schematic diagram of the format of a second type of PPDU provided in an embodiment of the present application. As shown in Figure 17, the second type of PPDU includes the following fields: non-ht short training field, legacy short training field, L-STF, legacy long training field, legacy signal field, L-SIG, repeated legacy signal field, RL-SIG, universal signal field, U-SIG, ultra high reliability short training field, UHR-STF, ultra high reliability long training field, UHR-LTF, and packet extension (PE).

[0173] In Figure 17, the UHR-LTF field includes two 4x UHR-LTF symbols, each 16 microseconds (2UHR-LTF symbols with 16μs per symbol using 4x UHR-LTF). The duration of the 4x HE-LTF symbol is 12.8μs (excluding the guard interval), and the guard interval (GI) used is 3.2μs. The PE field duration is 0μs.

[0174] This application also defines the subcarrier mapping of RU_TONE_SET_INDEX in the UHR-LTF field. The subcarrier mapping of RU_TONE_SET_INDEX can be as shown in Table 4.

[0175] Table 4

[0176] It should be noted that Table 4 is only an example. The subcarrier mapping of each RU_TONE_SET_INDEX shown in Table 4 can be implemented separately. In other words, Table 4 can be split and used.

[0177] It should be noted that the subcarrier mapping of RU_TONE_SET_INDEX can also be one RU_TONE_SET_INDEX corresponding to every 5 or every 4 subcarriers, which can increase the number of sites that can participate in feedback each time.

[0178] It should be noted that the mapping can also be designed differently for 52-tone RUs and / or 106-tone RUs than for 26-tone RUs, so that each group of 6 subcarriers is evenly distributed throughout the entire 52-tone RU and / or 106-tone RU. For example, in a 52-tone RU, the subcarrier groups corresponding to a feedback information value of 1 with RU_TONE_SET_INDEX being 1 can be {S+1, S+9, S+17, S+25, S+33, S+41}.

[0179] In addition, one RU_TONE_SET_INDEX may also correspond to one STA group.

[0180] In particular, if all stations transmit the same first indication information, the above RU_TONE_SET_INDEX mapping may not be performed on the UHR-LTF field of the second type PPDU. For example, it may be pre-specified not to perform the mapping, or the access point may pre-indicate or declare not to perform the mapping.

[0181] In some embodiments, the one or more frequency domain units reserved by the first STA may be located in the preamble of the PPDU. For example, the first uplink transmission may be transmitted via a first type of PPDU. The LTF field in the preamble of the first type of PPDU is not uplink transmitted on the reserved one or more frequency domain units. The first type of PPDU may be a newly defined PPDU. That is, the first STA may send the first uplink transmission via the first type of PPDU and reserve one or more frequency domain units in the preamble.

[0182] It is understandable that the second type of PPDU may correspond to the first type of PPDU. That is, when the first STA sends the first uplink transmission via the first type of PPDU, the second STA may report the first indication information via the second type of PPDU.

[0183] The above describes an implementation scheme in which the first indication information is carried in a preamble. The following describes an implementation scheme in which the first indication information is carried in a data field of a third type of PPDU.

[0184] In some embodiments, the first indication information may be carried in one or more LTF symbols in the data field. For example, when one or more frequency domain units are a smaller RU, the first indication information may be carried in one or more LTF symbols in the data field. The third type of PPDU may be a newly defined PPDU. One or more LTF symbols are transmitted in the data field of the third type of PPDU. In this case, the PPDU carrying the first uplink transmission (e.g., a TB PPDU triggered by a trigger frame) may use an existing format.

[0185] The number of LTF symbols transmitted in the data field of the third type of PPDU may be predefined. For example, in the case of uplink transmission based on a non-triggered frame, the number of LTF symbols may be one.

[0186] The number of LTF symbols transmitted in the data field of the third type of PPDU may be indicated. For example, in the case of uplink transmission based on a trigger frame, the number of LTF symbols may be indicated by the trigger frame.

[0187] In some implementations, RU_TONE_SET_INDEX mapping may be performed on the LTF symbols of the data field. The RU_TONE_SET_INDEX mapping of the LTF symbols may be as shown in Table 4.

[0188] In some implementations, RU_TONE_SET_INDEX mapping may not be performed on the LTF symbols of the data field. For example, when all stations transmit the same first indication information, RU_TONE_SET_INDEX mapping may not be performed on the LTF symbols of the data field. Exemplarily, it may be pre-specified that such mapping is not performed, or the access point may pre-indicate or announce that such mapping is not performed.

[0189] In some embodiments, the first indication information can be reported via a CTS frame carried in the data field. For example, when the reserved one or more frequency domain units are one or more 20 MHz subchannels or a smaller RU, the first indication information can be reported via a CTS frame carried in the data field. In this case, the PPDU carrying the first uplink transmission (e.g., a TB PPDU triggered by a trigger frame) can use an existing format.

[0190] It should be noted that, since the CTS frame (with a length of 14 bytes, i.e., 112 bits) is one of the shortest frames, it can be stipulated that when used to carry the first indication information, a specific transmission rate and / or a specific MCS is used for transmission, so that the frame is transmitted within one PPDU symbol, thereby solving the PPDU end misalignment problem that may occur in the reserved time domain unit scheme. Among them, the specific MCS can be, for example, 16-QAM or 64-QAM. This is because an uplink PPDU carrying a data frame or a management frame of a site includes at least one PPDU symbol. Even if an uplink PPDU carrying the first uplink transmission by the first STA only includes one PPDU symbol, based on the present application, the CTS frame can also be transmitted within one PPDU symbol, thereby avoiding the PPDU end misalignment problem caused by the completion of the first uplink transmission PPDU but the incomplete transmission of the CTS frame.

[0191] It should be noted that the specific transmission rate and / or specific MCS may meet the following requirements: pre-definition, pre-announcement, or indication through a trigger frame.

[0192] The pre-announcement may be pre-announced by the AP. For example, the AP may announce it in a beacon frame and / or a newly defined action frame. For example, the AP may announce a specific transmission rate and / or a specific MCS in a beacon frame and / or a newly defined action frame.

[0193] When the present application is applied to uplink transmission based on a trigger frame, the AP may indicate a specific transmission rate and / or a specific MCS through the trigger frame.

[0194] When the first indication information is carried in the data field, the scrambling seeds (scrambler seed) of the data fields of different PPDUs sent by different STAs need to be consistent, so as to ensure that the PPDU symbols sent by each STA are consistent, thereby achieving normal parsing of the data field.

[0195] The scrambling seed may meet one or more of the following requirements: predefined, preannounced, or indicated via a trigger frame. For example, the AP may announce the scrambling seed in a beacon frame and / or a newly defined action frame. For another example, when the present application is applied to uplink transmission based on a trigger frame, the AP may indicate the scrambling seed via a trigger frame.

[0196] It should be noted that the technical solution of reporting the first indication information through a CTS frame carried by a data field may only be applicable to the case where all STAs transmit the same first indication information.

[0197] The following describes how to determine or indicate one or more frequency domain units reserved in the first uplink transmission.

[0198] The one or more frequency domain units reserved by the first STA in the first uplink transmission can be indicated by reserved resource information. The reserved resource information not only needs to be known by the first STA in order to reserve resources, but also needs to be known by other STAs (e.g., the second STA) in addition to the first STA, in order to report the first indication information. Therefore, the reserved resource information can meet the following requirements: being specified by the protocol, configured by the access point, configured by the physical AP MLD to which the access point belongs, or configured by the virtual AP MLD to which the AP belongs. The configuration can include semi-static configuration or dynamic configuration.

[0199] For example, an access point may indicate reserved resource information in a beacon frame. Another example is when enabling delay-sensitive transmission priority mode. Another example is when indicating reserved resource information in a trigger frame. The following uses the example of indicating reserved resource information in a trigger frame as an example.

[0200] In some embodiments, before the first STA performs the first uplink transmission, the first STA may receive a second trigger frame sent by the AP. The second trigger frame may be related to the reserved resource information.

[0201] The second trigger frame may include a fourth field. The fourth field may be used to indicate that the first STA reserves frequency domain units for reporting the first indication information in at least one uplink transmission, the at least one uplink transmission including the first uplink transmission. Alternatively, the fourth field may be used to indicate that the first STA reserves frequency domain units for reporting the first indication information in uplink transmissions in the first TXOP.

[0202] In some embodiments, the first TXOP is a TXOP acquired by the first STA. That is, the fourth field is used to indicate that the first STA reserves a frequency domain unit for reporting the first indication information in the uplink transmission in the TXOP acquired by the first STA.

[0203] In some embodiments, the first TXOP is a TXOP acquired by the AP. That is, the fourth field is used to indicate that the first STA reserves a frequency domain unit for reporting the first indication information in uplink transmission in the TXOP acquired by the AP.

[0204] In some embodiments, the at least one uplink transmission may be indicated by the AP through other fields in the second trigger frame, or the at least one uplink transmission may be indicated by the AP through other frames, or the at least one uplink transmission may be indicated by the AP through the fourth field.

[0205] In some embodiments, the first TXOP may be indicated by the AP through other fields in the second trigger frame, or the first TXOP may be indicated by the AP through other frames, or the first TXOP may be indicated by the AP through the fourth field.

[0206] In some embodiments, the fourth field may occupy one bit. For example, a bit value of 0 may indicate that the first STA reserves a frequency domain unit for reporting the first indication information in at least one uplink transmission. For another example, a bit value of 0 may indicate that the first STA reserves a frequency domain unit for reporting the first indication information in the uplink transmission in the first TXOP. For another example, a bit value of 1 may indicate that the first STA reserves a frequency domain unit for reporting the first indication information in at least one uplink transmission. For another example, a bit value of 1 may indicate that the first STA reserves a frequency domain unit for reporting the first indication information in the uplink transmission in the first TXOP.

[0207] In some embodiments, the fourth field may be located in the general information field of the second trigger frame. For example, the AP may use a reserved bit in the general information field of the second trigger frame as the fourth field to instruct the STA triggered by the second trigger frame to reserve frequency domain units (such as subchannels or resource units) for reporting the first indication information in uplink transmission. The specific frequency domain unit (such as subchannel or resource unit) information has been set in advance.

[0208] For example, the second trigger frame can be as shown in Figure 18, where, in the general information field, the fourth field (indicated by a bold box) is located after the GI and HE-LTF type / triggered transmission opportunity sharing mode field, and the fourth field is located before the HE-LTF symbol number and intermediate code period field.

[0209] For another example, the second trigger frame may be as shown in FIG19 , wherein, in the general information field, the fourth field (represented by a bold box) is located after the HE-LTF symbol number and intermediate code period fields, and the fourth field is located before the LDPC additional symbol segmentation field.

[0210] For another example, the second trigger frame may be as shown in FIG20 , wherein in the general information field, the fourth field (indicated by a bold box) is located after the uplink spatial multiplexing field, and the fourth field is located before the HE / EHT P160 field.

[0211] For another example, the second trigger frame may be as shown in FIG21 , wherein, in the general information field, the fourth field (indicated by a bold box) is located after the EHT reserved field.

[0212] As shown in Figures 18 to 21, the general information field in the second trigger frame also includes the following fields: trigger frame type (occupies 4 bits), uplink length (occupies 12 bits), whether there are more trigger frames (occupies 1 bit), whether channel measurement is required (occupies 1 bit), uplink bandwidth (occupies 2 bits), guard interval (GI) and high-efficiency long training field (HE-LTF) type / triggered transmission opportunity sharing mode (occupies 2 bits), number of HE-LTF symbols and midamble period (occupies 3 bits), low-density parity check (LDPC) additional symbol segmentation (occupies 1 bit), AP transmit power (occupies 6 bits), pre-forward error correction (Pre-FEC) filling factor (occupies 2 bits), packet extension (PE) disambiguation (occupies 1 bit), uplink spatial multiplexing (occupies 16 bits), HE / EHT P160 (occupies 1 bit), special user information field identifier (occupies 1 bit), and EHT reserved (occupies 7 bits).

[0213] In some embodiments, the second trigger frame further includes a fifth field; wherein the fifth field is used to indicate the frequency domain unit information reserved by the first STA for reporting the first indication information.

[0214] For example, the AP can use the four reserved bits in the second trigger frame (such as the four reserved bits in the special user information field) as the fifth field to indicate the number of the reserved frequency domain unit (such as a subchannel). Within the operating bandwidth of the current BSS, the subchannels are numbered in ascending order of center frequency, or in descending order of center frequency, or in another predefined manner. Specifically, the subchannel corresponding to the primary channel cannot be used as a reserved subchannel.

[0215] For another example, the AP may use the eight reserved bits in the special user information field (whose AID12 field value is the special value 2007) in the second trigger frame as the fifth field to indicate the reserved resource units (RUs). The numbering method of the resource units is consistent with that used in the resource unit allocation field.

[0216] For example, the second trigger frame can be as shown in Figure 22, wherein, in the general information field, the fourth field (indicated by a bold box) is located after the GI and HE-LTF type / triggered transmission opportunity sharing mode field, and the fourth field is located before the HE-LTF symbol number and intermediate code period field; and in the special user information field in the user information list, the fifth field (occupying 4 bits) (indicated by a light gray box) can be located in the user information field related to the trigger frame subclass.

[0217] For example, the second trigger frame can be as shown in Figure 23, wherein, in the general information field, the fourth field (indicated by a bold box) is located after the GI and HE-LTF type / triggered transmission opportunity sharing mode field, and the fourth field is located before the HE-LTF symbol number and intermediate code period field; and in the special user information field in the user information list, the fifth field (occupying 8 bits) (indicated by a light gray box) can be located in the user information field related to the trigger frame subclass.

[0218] As shown in Figures 22 to 23, the special user information field in the second trigger frame also includes the following fields: AID12 (=2007), physical layer version flag, uplink bandwidth extension, EHT spatial multiplexing 1, EHT spatial multiplexing 2, user signal (user signal, U-SIG) ignore and check, and user information related to the trigger frame subclass.

[0219] As shown in Figures 18 to 23, the user information field in the second trigger frame includes the following fields: AID12, resource unit allocation, uplink forward error correction (FEC) coding type, uplink EHT modulation and coding category, spatial stream allocation or random access resource unit information, uplink target received power, primary and secondary 160, and user information related to the trigger frame subclass. Among them, the user information field related to the trigger frame subclass includes the following fields: multi-user medium access control protocol data unit (MPDU) slot factor, TID aggregation limit, and preferred access category.

[0220] In some embodiments, the second trigger frame further includes a sixth field; wherein the sixth field is used to indicate parameter information of the other STA to perform null data physical protocol data unit (NDP) feedback.

[0221] In some embodiments, the parameter information of the NDP feedback includes but is not limited to at least one of the following: an association identifier (AID), a starting AID, a feedback type, an uplink target received power, and the number of users in spatial multiplexing.

[0222] It should be noted that the first trigger frame and the second trigger frame may be the same or different trigger frames.

[0223] In some embodiments, if the second STA reports first indication information on one or more reserved frequency domain units, the AP may send preemption indication information to the first STA, wherein the preemption indication information is used to indicate that the AP will preempt the first TXOP.

[0224] In some embodiments, the preemption indication information is carried by a block confirmation frame corresponding to the first uplink transmission, or the preemption indication information is carried by a management frame.

[0225] In some embodiments, when the preemption indication information is carried by a block acknowledgment frame corresponding to the first uplink transmission, a block acknowledgment control (BA Control) field in the block acknowledgment frame corresponding to the first uplink transmission includes a field for indicating that the AP will preempt the first TXOP.

[0226] For example, as shown in FIG. 24 , the AP uses a reserved bit in the Block ACK Control (BA Control) field of the Block ACK frame to indicate that the AP will preempt the field of the first TXOP.

[0227] In some embodiments, after learning that the first STA or AP has turned on the delay-sensitive transmission priority mode (also known as the low-latency transmission priority mode), other STAs (such as the second STA) can determine that the first STA has reserved one or more frequency domain units for reporting the first indication information in the first uplink transmission.

[0228] For example, after learning that the first STA or AP has turned on the delay-sensitive transmission priority mode, other STAs (such as the second STA) can determine that the first STA has reserved a frequency domain unit for reporting the first indication information in at least one uplink transmission, and the at least one uplink transmission includes the first uplink transmission.

[0229] For another example, after learning that the first STA or AP has enabled the delay-sensitive transmission priority mode, other STAs (such as the second STA) can determine that the first STA has reserved a frequency domain unit for reporting the first indication information in the uplink transmission in the first TXOP.

[0230] In some embodiments, when the first STA turns on the delay-sensitive transmission priority mode, other STAs (such as the second STA) can learn that the first STA has turned on the delay-sensitive transmission priority mode through beacon frames and / or management frames sent by the AP.

[0231] For example, the first STA may perform mode switching in advance (i.e., enable the delay-sensitive transmission priority mode), and the AP broadcasts in the beacon frame that the first STA has enabled the delay-sensitive transmission priority mode (the mode switching of the first STA takes effect after at least one beacon frame transmission). The reserved one or more frequency domain units may be predefined or indicated in the beacon frame. After the first STA enables the delay-sensitive transmission priority mode, the frequency domain unit for reporting the first indication information is reserved in at least one uplink transmission, or the frequency domain unit for reporting the first indication information is reserved in the uplink transmission in the first TXOP.

[0232] For another example, the first STA switches modes in advance (i.e., turns on the delay-sensitive transmission priority mode), and the AP sends a newly defined management frame to announce that the first STA has turned on the delay-sensitive transmission priority mode. The reserved one or more frequency domain units can be predefined or indicated in the newly defined management frame. After the first STA turns on the delay-sensitive transmission priority mode, the frequency domain unit for reporting the first indication information is reserved in at least one uplink transmission, or the frequency domain unit for reporting the first indication information is reserved in the uplink transmission in the first TXOP.

[0233] In some embodiments, the delay-sensitive transmission priority mode corresponding to the first STA is enabled based on a request from the AP, or the delay-sensitive transmission priority mode corresponding to the first STA is enabled by the first STA and notified to the AP.

[0234] In some embodiments, when the delay-sensitive transmission priority mode corresponding to the first STA is enabled based on a request from an AP, the activation duration of the delay-sensitive transmission priority mode corresponding to the first STA is configured by the AP in the request information, and / or the one or more frequency domain units are configured by the AP in the request information.

[0235] For example, the AP may send a management frame to at least one STA to request to enable the delay-sensitive transmission priority mode. Optionally, the management frame may further indicate the following information: the activation duration of the delay-sensitive transmission priority mode, and / or the specific frequency domain units reserved (i.e., one or more frequency domain units). When the delay-sensitive transmission priority mode is enabled, the STA may reserve frequency domain units (subchannels or RUs) for other STAs to report the first indication information to the AP when performing uplink transmission in the TXOP obtained by itself, and the AP may seize the transmission time in the TXOP obtained by the at least one STA for uplink and / or downlink delay-sensitive data transmission with other STAs. Specifically, for example, the AP may also send a management frame to the at least one STA to request to disable the delay-sensitive transmission priority mode.

[0236] In some embodiments, when the delay-sensitive transmission priority mode corresponding to the first STA is turned on by the first STA and notified to the AP, the activation duration of the delay-sensitive transmission priority mode corresponding to the first STA is indicated by the first STA in the notification information, and / or the one or more frequency domain units are configured by the first STA in the notification information, and / or the one or more frequency domain units are configured by the AP in the notification response.

[0237] For example, the STA may send a management frame to the AP to notify it to enable the delay-sensitive transmission priority mode. Optionally, the management frame may further indicate the following information: the duration of the delay-sensitive transmission priority mode, and / or the specific frequency domain unit reserved (i.e., one or more frequency domain units reserved for other STAs to report the first indication information); the AP responds with a management frame, which may further confirm or instruct to modify the specific frequency domain unit reserved (i.e., one or more frequency domain units). When the delay-sensitive transmission priority mode is enabled, the STA may reserve frequency domain units (subchannels or RUs) for other STAs to report the first indication information to the AP when performing uplink transmission in the TXOP obtained by itself, and the AP may preempt the transmission time in the TXOP obtained by the at least one STA for uplink and / or downlink delay-sensitive data transmission with other STAs. For example, the STA may also send a management frame to the AP to notify it to disable the delay-sensitive transmission priority mode.

[0238] In some embodiments, when the AP enables the delay-sensitive transmission priority mode, other STAs (such as the second STA) learn that the AP has enabled the delay-sensitive transmission priority mode through at least one of the following frames sent by the AP: beacon frame, probe response frame, association response frame, reassociation response frame, operation mode notification frame, and newly defined management frame.

[0239] In some embodiments, the AP indicates at least one of the following when indicating that the delay-sensitive transmission priority mode is enabled: the activation duration of the delay-sensitive transmission priority mode corresponding to the AP, and one or more reserved frequency domain units.

[0240] In some embodiments, the turning on and / or off of the delay-sensitive transmission priority mode corresponding to the AP is associated with the transmission information of delay-sensitive data in the basic service set (BSS), or the turning on and / or off of the delay-sensitive transmission priority mode corresponding to the AP is set by user signaling.

[0241] For example, the AP may enable the delay-sensitive transmission priority mode. When the delay-sensitive transmission priority mode is enabled, the AP may require the STA, in the TXOP obtained by itself, to reserve frequency domain units during uplink transmission for other STAs to report first indication information to the AP. For example, the AP may send a management frame (e.g., a beacon frame and / or a probe response frame and / or an association response frame and / or a reassociation response frame and / or an operation mode notification frame) to inform the STA that the delay-sensitive transmission priority mode is enabled; optionally, the management frame may further indicate the following information: the activation duration of the delay-sensitive transmission priority mode, and / or the specific frequency domain units reserved (i.e., m1 frequency domain units). For another example, the AP may send a management frame (e.g., a beacon frame and / or a probe response frame and / or an association response frame and / or a reassociation response frame and / or an operation mode notification frame) to inform the STA that the delay-sensitive transmission priority mode is turned off.

[0242] In some embodiments, the number of frequency domain units reserved by the first STA may be m1. Here, m1 may be a positive integer. The first STA or the second STA reserves m2 frequency domain units in the second uplink transmission. The m2 frequency domain units are used for one or more other STAs with uplink delay-sensitive data to be transmitted to report first indication information, and m2 is a positive integer. For example, the second uplink transmission may be used to transmit low-latency data for the second STA.

[0243] For example, the third STA reports the first indication information on m2 frequency domain units, where the m2 frequency domain units are frequency domain units reserved by the first STA or the second STA in the second uplink transmission, and m2 is a positive integer.

[0244] In some embodiments, the frequency domain units in the m2 frequency domain units are RUs; or, the frequency domain units in the m2 frequency domain units are subchannels.

[0245] In some embodiments, the frequency domain units in the m1 frequency domain units are the same as the frequency domain units in the m2 frequency domain units. For example, the frequency domain units in the m1 frequency domain units and the frequency domain units in the m2 frequency domain units are the same RU, or the frequency domain units in the m1 frequency domain units and the frequency domain units in the m2 frequency domain units are the same subchannel.

[0246] In some embodiments, the frequency domain units in the m1 frequency domain units are different from the frequency domain units in the m2 frequency domain units. For example, the frequency domain units in the m1 frequency domain units are RUs, and the frequency domain units in the m2 frequency domain units are subchannels. For another example, the frequency domain units in the m1 frequency domain units are subchannels, and the frequency domain units in the m2 frequency domain units are RUs. For another example, the frequency domain units in the m1 frequency domain units and the frequency domain units in the m2 frequency domain units are RUs at different frequency positions. For another example, the frequency domain units in the m1 frequency domain units and the frequency domain units in the m2 frequency domain units are subchannels at different frequency positions.

[0247] As shown in Figure 25, Site 1 can reserve m1 subchannels. Sites 2 and 3 report low-latency indications on m1 subchannels. The AP obtains the cache information of Sites 2 and 3 using a BSRP trigger frame. Based on the obtained cache information, the AP sends a trigger frame with an RU indication. Based on this RU indication, Site 2 can reserve m2 RUs for other sites to send low-latency indications. Site 3 can reserve m2 RUs for other sites to send low-latency indications.

[0248] In some embodiments, the first uplink transmission and the second uplink transmission may belong to the same TXOP, or the first uplink transmission and the second uplink transmission may belong to different TXOPs.

[0249] In some embodiments, the first uplink transmission is an uplink transmission in periodic uplink transmission, and / or the second uplink transmission is an uplink transmission in periodic uplink transmission.

[0250] The technical solution of this application is described in detail below through specific embodiments.

[0251] Example 1

[0252] As shown in Figure 26, the first station obtains a transmission opportunity and reserves at least one subchannel when performing at least one uplink transmission with the access point. If at least one other station generates uplink low-latency data to be transmitted before the uplink transmission, the other station can use the reserved subchannel to send a low-latency indication during the uplink transmission to indicate to the access point that the other station has low-latency traffic to be transmitted and / or needs to preempt the transmission opportunity. After receiving the low-latency indication, the access point indicates in a response or confirmation to the first station that it will preempt the transmission opportunity. After receiving the preemption indication, the first station will stop actively transmitting uplink. After preempting the transmission opportunity, the access point will use the existing BSRP trigger frame to obtain buffer status reports from multiple stations or use the existing NFRP to obtain null data physical layer transmission protocol data unit feedback from multiple stations. It then uses the existing trigger frame-based uplink transmission process to trigger each station (including the other stations and / or the first station) to perform uplink transmission.

[0253] The first station may use a data frame and / or a management frame in the uplink transmission with the access point. The low-latency indication may adopt the existing null data physical layer transmission protocol data unit feedback (HE TB feedback NDP), and / or a CTS frame, and / or a PPDU newly defined in this application. The access point may use a management frame and / or an acknowledgment frame and / or a block acknowledgment frame in the response or confirmation to the first station. The BSRP trigger frame and basic trigger frame sent by the access point to each station may use the existing trigger frame, i.e., no subchannel or resource unit is reserved in the uplink transmission triggered by the trigger frame; or the trigger frame newly defined in this application may carry a reserved subchannel or resource unit indication, i.e., subchannels or resource units are also reserved in the uplink transmission triggered by the trigger frame.

[0254] In this scenario, there may be three methods for the other station to determine whether the first station has reserved a sub-channel or not:

[0255] Method 1: The first station switches mode in advance (i.e., turns on low-latency transmission priority mode), and the access point broadcasts in a beacon frame that the first station has turned on low-latency transmission priority mode. (In this method, the mode switch of the first station takes effect after at least one beacon frame transmission.) The specific reserved subchannel information can be predefined or indicated in the beacon frame. After the first station turns on low-latency transmission priority mode, it always reserves the subchannel in the transmission opportunities it obtains.

[0256] Method 2: The first station switches modes in advance (i.e., enables low-latency transmission priority mode). The access point broadcasts a newly defined management frame to announce that the first station has enabled low-latency transmission priority mode. The specific reserved subchannel information can be predefined or indicated in the newly defined management frame. After the first station enables low-latency transmission priority mode, it always reserves the subchannel in all transmission opportunities it obtains.

[0257] Method 3: The first station indicates in the RTS frame sent to the access point, for example, setting the unicast or multicast (individual / group) bit in the receiver address (RA) of the frame to 1 to indicate that the first station has reserved a subchannel in this transmission opportunity, and setting it to 0 to indicate that the first station has not reserved a subchannel in this transmission opportunity. The specific reserved subchannel information can be predefined or indicated by the access point in a previous beacon frame.

[0258] In the transmission opportunity of the first station, the legacy station (legacy STA) does not support the low latency indication function and will not transmit the low latency indication.

[0259] If the existing HE TB feedback NDP is used, in the transmission opportunity of the first site, the access point does not send NFRP but receives the null data physical layer transport protocol data unit feedback, so it can be distinguished as a low latency indication rather than the buffered data amount report in the existing technology.

[0260] Example 2

[0261] As shown in Figure 27, the access point obtains a transmission opportunity, and the access point performs at least one downlink transmission with the first station. The first station reserves at least one sub-channel when performing an uplink response or confirmation to the access point. If at least one other station generates uplink low-latency data to be sent before the uplink response or confirmation, the other station can use the reserved sub-channel to send the low-latency indication when responding or confirming the uplink. After receiving the low-latency indication, the access point will use the existing BSRP trigger frame to obtain the cache status report of multiple stations or use the existing NFRP to obtain the empty data physical layer transmission protocol data unit feedback of multiple stations, and then use the existing uplink transmission process based on the trigger frame to trigger each station (including the other stations and / or the first station) to perform uplink transmission.

[0262] The downlink transmission between the access point and the first station may be a data frame and / or a management frame. The low-latency indication may adopt the existing null data physical layer transmission protocol data unit feedback (HE TB feedback NDP), and / or a CTS frame, and / or a PPDU newly defined in this application. The uplink response or confirmation of the first station may be a management frame and / or an confirmation frame and / or a block confirmation frame. The BSRP trigger frame and basic trigger frame sent by the access point to each station may use the existing trigger frame, that is, no sub-channel or resource unit is reserved in the uplink transmission triggered by the trigger frame; or the trigger frame newly defined in this application may be used, which carries a reserved sub-channel or resource unit indication, that is, the sub-channel or resource unit is also reserved in the uplink transmission triggered by the trigger frame.

[0263] In this scenario, the method for the other stations to determine whether the first station has reserved a sub-channel or not is similar to that in embodiment 1. The difference is that in method 3, the access point indicates it in the RTS frame sent to the first station.

[0264] Example 3

[0265] As shown in Figure 28, the access point obtains a transmission opportunity, and the access point triggers the first station to perform at least one uplink transmission. The first station reserves at least one sub-channel during the uplink transmission. If at least one other station generates uplink low-latency data to be sent before the uplink transmission, the other station can use the reserved sub-channel to send the low-latency indication during the uplink transmission. After the access point low-latency indication, it will use the existing BSRP trigger frame to obtain the cache status report of multiple stations or use the existing NFRP to obtain the empty data physical layer transmission protocol data unit feedback of multiple stations, and then use the existing trigger frame-based uplink transmission process to trigger each station (including the other stations and / or the first station) to perform uplink transmission.

[0266] When the access point triggers the first station to perform uplink transmission, it may use an existing trigger frame (i.e., predefined or pre-negotiated reserved subchannels are reserved in the first station's uplink transmission), or it may use a trigger frame newly defined in this application to carry a reserved subchannel indication. The low-latency indication may use an existing null data physical layer transport protocol data unit feedback (HETB feedback NDP), and / or a CTS frame, and / or a PPDU newly defined in this application. The first station's uplink transmission may include data frames, management frames, acknowledgment frames, and / or block acknowledgment frames. The trigger frame sent by the access point to each station may use an existing trigger frame, i.e., no subchannels or resource units are reserved in the uplink transmission triggered by the trigger frame; or it may use a trigger frame newly defined in this application, which carries a reserved subchannel or resource unit indication, i.e., subchannels or resource units are reserved in the uplink transmission triggered by the trigger frame.

[0267] In embodiment 3, the method for the other stations to determine whether the first station has reserved a subchannel or not is: indicating in a trigger frame of the access point, or indicating in an RTS frame using method 3 in embodiment 2.

[0268] Example 4

[0269] As shown in FIG. 29 , similar to Embodiment 3, after the access point obtains the transmission opportunity, the access point triggers multiple first stations (the first stations also include the second stations) to perform at least one uplink transmission.

[0270] In embodiment 4, the method for the other stations to determine whether the first station has reserved a subchannel or not is: indicating in the trigger frame of the access point, or indicating in the MU-RTS trigger frame similar to method 3 in embodiment 2.

[0271] Example 5

[0272] As shown in FIG30 , similar to Example 4, after the access point obtains the transmission opportunity, the access point performs at least one downlink transmission to at least one first station and triggers at least one second station to perform at least one uplink transmission, wherein the first station of the access point may be the same as or different from the second station.

[0273] In this scenario, the method for the other stations to determine whether the first station has reserved a sub-channel or not is the same as that in embodiment 4.

[0274] Example 6

[0275] In the scenario described in Example 1, the first station may use any format of PPDU supported by it except TB PPDU when performing uplink transmission with the access point. In this case, it is difficult for other stations to predict the preamble signal of the PPDU, and it is not possible to use only an RU that does not occupy a complete 20Mhz sub-channel to transmit the NDP. On the same 20Mhz sub-channel, if the sender sends different PPDU preambles, it will cause interference, resulting in the receiver being unable to correctly receive the PPDU. Therefore, the method of reserving RUs is limited in this scenario, and only RUs occupying a complete 20Mhz sub-channel can be reserved, which is essentially the same as the method of reserving sub-channels.

[0276] In the scenario described in Example 2, the first station may use any supported PPDU format, except for the TB PPDU, when communicating with the access point in an uplink response or confirmation. Similarly, the method for reserving RUs is limited in this scenario, and only RUs occupying a full 20 MHz sub-channel can be reserved, which is essentially the same as the method for reserving sub-channels.

[0277] Example 7

[0278] In the scenario described in at least one of Embodiment 3, Embodiment 4, and Embodiment 5, the first station may reserve at least one RU in its working bandwidth. Figure 31 illustrates an example of the first station reserving at least one RU in the scenario described in Embodiment 3. Figure 32 illustrates an example of the first station reserving at least one RU in the scenario described in Embodiment 4. Figure 33 illustrates an example of the first station reserving at least one RU in the scenario described in Embodiment 5.

[0279] All stations can predict the preamble of the TB PPDU to be transmitted uplink by receiving the trigger frame sent by the access point, so the transmission of the PPDU using the same preamble by other stations on at least one RU will not cause interference.

[0280] Because the existing HE TB feedback NDP format can only be transmitted on one or more complete 20 MHz sub-channels, the HE TB feedback NDP format can be used only when the reserved RU occupies one or more complete 20 MHz sub-channels.

[0281] When the reserved RU occupies only a portion of a 20 MHz subchannel, the low latency indication can only use a CTS frame and / or the second type of PPDU newly defined in this application. If the low latency indication specifically uses a CTS frame (carried in the data field of the PPDU), the TB PPDU triggered by the trigger frame can use the existing format. If the low latency indication specifically uses the LTF field in the preamble of the newly defined PPDU, the LTF field of the TB PPDU triggered by the trigger frame also needs to be modified (i.e., not transmitted on the reserved RU).

[0282] It should be noted that, in the embodiments of the present application, a "field" may also be referred to as a "field" or a "subfield." A field may occupy one or more bytes (byte / octet), or a field may occupy one or more bits (bit).

[0283] The method embodiments of the present application are described in detail above, and the device embodiments of the present application are described in detail below. It should be understood that the description of the method embodiments corresponds to the description of the device embodiments, so for parts not described in detail, reference can be made to the above method embodiments.

[0284] FIG34 is a schematic structural diagram of a communication device 3400 provided in an embodiment of the present application. The communication device 3400 is a first STA and includes a transmitting unit 3410.

[0285] A sending unit is used to send a first uplink transmission to an access point AP within a first TXOP; wherein, the first STA reserves one or more frequency domain units in the first uplink transmission, and the one or more frequency domain units are used for the second STA to report first indication information, and the first indication information is used to indicate: the second STA contains low-latency traffic to be transmitted, and / or, the second STA needs to preempt the first TXOP.

[0286] In some embodiments, the first indication information is used to indicate that: one or more STAs among all STAs associated with the AP contain low-latency traffic to be transmitted, and / or one or more STAs among all STAs associated with the AP need to preempt the first TXOP.

[0287] In some embodiments, the multiple STAs associated with the AP are divided into one or more STA groups, the one or more STA groups include a first STA group, the first STA group includes the second STA, and the first indication information is used to indicate: one or more STAs in the first STA group contain low-latency traffic to be transmitted, and / or, one or more STAs in the first STA group need to preempt the first TXOP.

[0288] In some embodiments, the device 3400 is also used to: receive a first trigger frame; wherein the first trigger frame includes a first field, and the first field is used to indicate one or more of the following: the number of STAs in the first STA group, and the number of the one or more STA groups.

[0289] In some embodiments, the first trigger frame further includes a second field, where the second field is used to indicate a minimum association identifier of a plurality of STAs associated with the AP.

[0290] In some embodiments, the first uplink transmission is transmitted via a first type of physical layer protocol data unit PPDU; an LTF field in a preamble of the first type of PPDU is not uplink transmitted on the reserved one or more frequency domain units.

[0291] In some embodiments, the first indication information is reported through one or more of the following NDPs: HE TB feedback NDP, HE sounding NDP, EHT sounding NDP, UHR sounding NDP.

[0292] In some embodiments, the first indication information is reported via a second type of PPDU; the first indication information is carried in a long training field (LTF) field in a preamble of the second type of PPDU.

[0293] In some embodiments, the first indication information is reported via a third type of PPDU; the first indication information is carried in a data field of the third type of PPDU.

[0294] In some embodiments, the first indication information is carried in one or more LTF symbols in the data field.

[0295] In some embodiments, the first indication information is reported via a CTS frame carried by the data field.

[0296] In some embodiments, the scrambling seed of the data field satisfies one or more of the following: predefined, pre-announced, and indicated by a trigger frame.

[0297] In an optional embodiment, the sending unit 3410 may be a transceiver 3730. The communication device 3400 may further include a processor 3710 and a memory 3720, as specifically shown in FIG37 .

[0298] 35 is a schematic structural diagram of a communication device 3500 provided in an embodiment of the present application. The communication device 3500 is a second STA, and the communication device 3500 includes: a reporting unit 3510.

[0299] The reporting unit 3510 is used to report first indication information to the AP on one or more frequency domain units within the first TXOP; wherein the one or more frequency domain units are frequency domain resources reserved by the first STA in the first uplink transmission, and the first indication information is used to indicate: the second STA contains low-latency traffic to be transmitted, and / or, the second STA needs to preempt the first TXOP.

[0300] In some embodiments, the first indication information is used to indicate that: one or more STAs among all STAs associated with the AP contain low-latency traffic to be transmitted, and / or one or more STAs among all STAs associated with the AP need to preempt the first TXOP.

[0301] In some embodiments, the multiple STAs associated with the AP are divided into one or more STA groups, the one or more STA groups include a first STA group, the first STA group includes the second STA, and the first indication information is used to indicate: one or more STAs in the first STA group contain low-latency traffic to be transmitted, and / or, one or more STAs in the first STA group need to preempt the first TXOP.

[0302] In some embodiments, the communication device 3500 is also used to: receive a first trigger frame; wherein the first trigger frame includes a first field, and the first field is used to indicate one or more of the following: the number of STAs in the first STA group, the number of the one or more STA groups.

[0303] In some embodiments, the first trigger frame further includes a second field, where the second field is used to indicate a minimum association identifier of a plurality of STAs associated with the AP.

[0304] In some embodiments, the first uplink transmission is transmitted via a first type of physical layer protocol data unit PPDU; an LTF field in a preamble of the first type of PPDU is not uplink transmitted on the reserved one or more frequency domain units.

[0305] In some embodiments, the first indication information is reported through one or more of the following NDPs: HE TB feedback NDP, HE sounding NDP, EHT sounding NDP, UHR sounding NDP.

[0306] In some embodiments, the first indication information is reported via a second type of PPDU; the first indication information is carried in an LTF field in a preamble of the second type of PPDU.

[0307] In some embodiments, the first indication information is reported via a third type of PPDU; the first indication information is carried in a data field of the third type of PPDU.

[0308] In some embodiments, the first indication information is carried in one or more LTF symbols in the data field.

[0309] In some embodiments, the first indication information is reported via a CTS frame carried by the data field.

[0310] In some embodiments, the scrambling seed of the data field satisfies one or more of the following: predefined, pre-announced, and indicated by a trigger frame.

[0311] In an optional embodiment, the reporting unit 3510 may be a transceiver 3730. The communication device 3500 may further include a processor 3710 and a memory 3720, as specifically shown in FIG37 .

[0312] FIG36 is a schematic structural diagram of a communication device 3600 provided in an embodiment of the present application. The communication device 3600 is an AP and includes a receiving unit 3610.

[0313] The receiving unit 3610 is used to receive the first uplink transmission of the first STA within the first TXOP; wherein, the first STA reserves one or more frequency domain units in the first uplink transmission, and the one or more frequency domain units are used for the second STA to report the first indication information, and the first indication information is used to indicate: the second STA contains low-latency traffic to be transmitted, and / or, the second STA needs to preempt the first TXOP.

[0314] In some embodiments, the first indication information is used to indicate that: one or more STAs among all STAs associated with the AP contain low-latency traffic to be transmitted, and / or one or more STAs among all STAs associated with the AP need to preempt the first TXOP.

[0315] In some embodiments, the multiple STAs associated with the AP are divided into one or more STA groups, the one or more STA groups include a first STA group, the first STA group includes the second STA, and the first indication information is used to indicate: one or more STAs in the first STA group contain low-latency traffic to be transmitted, and / or, one or more STAs in the first STA group need to preempt the first TXOP.

[0316] In some embodiments, the communication device 3600 is further used to: send a first trigger frame; wherein the first trigger frame includes a first field, and the first field is used to indicate one or more of the following: the number of STAs in the first STA group, the number of the one or more STA groups.

[0317] In some embodiments, the first trigger frame further includes a second field, where the second field is used to indicate a minimum association identifier of a plurality of STAs associated with the AP.

[0318] In some embodiments, the first uplink transmission is transmitted via a first type of physical layer protocol data unit PPDU; an LTF field in a preamble of the first type of PPDU is not uplink transmitted on the reserved one or more frequency domain units.

[0319] In some embodiments, the first indication information is reported through one or more of the following NDPs: HE TB feedback NDP, HE sounding NDP, EHT sounding NDP, UHR sounding NDP.

[0320] In some embodiments, the first indication information is reported via a second type of PPDU; the first indication information is carried in a long training field (LTF) field in a preamble of the second type of PPDU.

[0321] In some embodiments, the first indication information is reported via a third type of PPDU; the first indication information is carried in a data field of the third type of PPDU.

[0322] In some embodiments, the first indication information is carried in one or more LTF symbols in the data field.

[0323] In some embodiments, the first indication information is reported via a CTS frame carried by the data field.

[0324] In some embodiments, the scrambling seed of the data field satisfies one or more of the following: predefined, pre-announced, and indicated by a trigger frame.

[0325] In an optional embodiment, the receiving unit 3610 may be the transceiver 3430. The communication device 3600 may further include a processor 3710 and a memory 3720, as specifically shown in FIG37 .

[0326] Figure 37 is a schematic block diagram of a communication device according to an embodiment of the present application. The dashed lines in Figure 37 indicate that the unit or module is optional. Apparatus 3700 may be used to implement the method described in the above method embodiment. Apparatus 3700 may be a chip, a terminal device, or a network device.

[0327] The device 3700 may include one or more processors 3710. The processor 3710 may support the device 3700 to implement the method described in the method embodiment above. The processor 3710 may be a general-purpose processor or a special-purpose processor. For example, the processor may be a central processing unit (CPU). Alternatively, the processor may be another general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware component, etc. The general-purpose processor may be a microprocessor or the processor may be any conventional processor, etc.

[0328] The apparatus 3700 may further include one or more memories 3720. The memories 3720 store programs that can be executed by the processor 3710, causing the processor 3710 to perform the methods described in the above method embodiments. The memories 3720 may be independent of the processor 3710 or integrated into the processor 3710.

[0329] The apparatus 3700 may further include a transceiver 3730. The processor 3710 may communicate with other devices or chips via the transceiver 3730. For example, the processor 3710 may transmit and receive data with other devices or chips via the transceiver 3730.

[0330] The present application also provides a computer-readable storage medium for storing a program. The computer-readable storage medium can be applied to a terminal or network device provided in the present application, and the program enables a computer to execute the method performed by the terminal or network device in each embodiment of the present application.

[0331] The present application also provides a computer program product. The computer program product includes a program. The computer program product can be applied to a terminal or network device provided in the present application, and the program causes a computer to execute the method performed by the terminal or network device in each embodiment of the present application.

[0332] The embodiments of the present application also provide a computer program. The computer program can be applied to the terminal or network device provided in the embodiments of the present application, and the computer program enables a computer to execute the method performed by the terminal or network device in each embodiment of the present application.

[0333] It should be understood that the terms "system" and "network" in this application can be used interchangeably. In addition, the terms used in this application are only used to explain the specific embodiments of this application and are not intended to limit this application. The terms "first", "second", "third", and "fourth" in the specification and claims of this application and the accompanying drawings are used to distinguish different objects rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0334] In the embodiments of this application, the term "indication" may refer to a direct indication, an indirect indication, or an indication of an association. For example, "A indicates B" may refer to a direct indication of B, e.g., B can obtain information through A; it may refer to an indirect indication of B, e.g., A indicates C, e.g., B can obtain information through C; or it may refer to an association between A and B.

[0335] In the embodiment of the present application, "B corresponding to A" means that B is associated with A and B can be determined based on A. However, it should be understood that determining B based on A does not mean determining B based solely on A, but B can also be determined based on A and / or other information.

[0336] In the embodiments of the present application, the term "corresponding" may indicate a direct or indirect correspondence between the two, or an association relationship between the two, or a relationship between indication and indication, configuration and configuration, etc.

[0337] In the embodiments of the present application, "pre-definition" or "pre-configuration" may be implemented by pre-storing corresponding codes, tables, or other methods that can be used to indicate relevant information in a device (e.g., a terminal device and a network device). The present application does not limit the specific implementation method. For example, pre-definition may refer to information defined in a protocol.

[0338] In the embodiments of this application, the term "and / or" is simply a description of the association relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this document generally indicates that the related objects are in an "or" relationship.

[0339] In the embodiments of this application, the term "include" can refer to direct inclusion or indirect inclusion. Alternatively, the term "include" in the embodiments of this application can be replaced with "indicates" or "is used to determine." For example, "A includes B" can be replaced with "A indicates B" or "A is used to determine B."

[0340] In various embodiments of the present application, the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0341] In the embodiments of the present application, the “protocol” may refer to a standard protocol in the communication field, for example, it may include a WiFi protocol and related protocols used in future WiFi communication systems, and the present application does not limit this.

[0342] In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of the units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0343] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0344] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0345] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the process or function described in the embodiment of the present application is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions can be transmitted from one website, computer, server or data center to another website, computer, server or data center via a wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) method. The computer-readable storage medium can be any available medium that can be read by a computer or a data storage device such as a server or data center that includes one or more available media integrated therein. The available medium may be a magnetic medium (eg, a floppy disk, a hard disk, a magnetic tape), an optical medium (eg, a digital versatile disc (DVD)), or a semiconductor medium (eg, a solid state disk (SSD)).

[0346] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A wireless communication method, characterized in that: include: In a first transmission opportunity TXOP, a first station STA sends a first uplink transmission to an access point AP; Among them, the first STA reserves one or more frequency domain units in the first uplink transmission, and the one or more frequency domain units are used for the second STA to report first indication information, and the first indication information is used to indicate: the second STA contains low-latency traffic to be transmitted, and / or, the second STA needs to preempt the first TXOP.

2. The method according to claim 1, characterized in that The first indication information is used to indicate that: one or more STAs among all STAs associated with the AP contain low-latency traffic to be transmitted, and / or, one or more STAs among all STAs associated with the AP need to seize the first TXOP.

3. The method according to claim 1, characterized in that The multiple STAs associated with the AP are divided into one or more STA groups, the one or more STA groups include a first STA group, the first STA group includes the second STA, and the first indication information is used to indicate: one or more STAs in the first STA group contain low-latency traffic to be transmitted, and / or, one or more STAs in the first STA group need to preempt the first TXOP.

4. The method according to claim 3, characterized in that Also includes: The first STA receives a first trigger frame; The first trigger frame includes a first field, and the first field is used to indicate one or more of the following: the number of STAs in the first STA group and the number of the one or more STA groups.

5. The method according to claim 4, characterized in that The first trigger frame also includes a second field, where the second field is used to indicate a minimum association identifier of multiple STAs associated with the AP.

6. The method according to any one of claims 1 to 5, characterized in that The first uplink transmission is transmitted via a first type of physical layer protocol data unit PPDU; an LTF field in a preamble of the first type of PPDU is not uplink transmitted on the reserved one or more frequency domain units.

7. The method according to any one of claims 1 to 6, characterized in that The first indication information is reported through one or more of the following empty data physical layer transmission protocol data units NDP: efficient trigger feedback based empty data physical layer protocol data unit HE TB feedback NDP, efficient detection empty data physical layer protocol data unit HE sounding NDP, extremely high throughput detection empty data physical layer protocol data unit EHT sounding NDP, and extremely high reliability detection empty data physical layer protocol data unit UHR sounding NDP.

8. The method according to any one of claims 1 to 6, characterized in that The first indication information is reported through the second type of PPDU; the first indication information is carried in the long training field LTF field in the preamble code of the second type of PPDU.

9. The method according to any one of claims 1 to 6, characterized in that: The first indication information is reported via a third type of PPDU; the first indication information is carried in a data field of the third type of PPDU.

10. The method according to claim 9, characterized in that The first indication information is carried in one or more LTF symbols in the data field.

11. The method according to claim 9, characterized in that The first indication information is reported via a CTS frame carried by the data field.

12. The method according to any one of claims 9 to 11, characterized in that: The scrambling seed of the data field satisfies one or more of the following: predefined, pre-announced, and indicated by a trigger frame.

13. A wireless communication method, characterized in that: include: In the first transmission opportunity TXOP, the second station STA reports the first indication information to the access point AP on one or more frequency domain units; The one or more frequency domain units are frequency domain resources reserved by the first STA in the first uplink transmission, and the first indication information is used to indicate that: the second STA contains low-latency traffic to be transmitted, and / or, the second STA needs to preempt the first TXOP.

14. The method according to claim 13, characterized in that The first indication information is used to indicate that: one or more STAs among all STAs associated with the AP contain low-latency traffic to be transmitted, and / or, one or more STAs among all STAs associated with the AP need to seize the first TXOP.

15. The method according to claim 13, characterized in that The multiple STAs associated with the AP are divided into one or more STA groups, the one or more STA groups include a first STA group, the first STA group includes the second STA, and the first indication information is used to indicate: one or more STAs in the first STA group contain low-latency traffic to be transmitted, and / or, one or more STAs in the first STA group need to preempt the first TXOP.

16. The method according to claim 15, characterized in that Also includes: The second STA receives a first trigger frame; The first trigger frame includes a first field, and the first field is used to indicate one or more of the following: The number of STAs in the group, and the group number of the one or more STA groups.

17. The method according to claim 16, characterized in that The first trigger frame also includes a second field, where the second field is used to indicate a minimum association identifier of multiple STAs associated with the AP.

18. The method according to any one of claims 13 to 17, characterized in that: The first uplink transmission is transmitted via a first type of physical layer protocol data unit PPDU; an LTF field in a preamble of the first type of PPDU is not uplink transmitted on the reserved one or more frequency domain units.

19. The method according to any one of claims 13 to 18, characterized in that The first indication information is reported through one or more of the following empty data physical layer transmission protocol data units NDP: efficient trigger feedback based empty data physical layer protocol data unit HE TB feedback NDP, efficient detection empty data physical layer protocol data unit HE sounding NDP, extremely high throughput detection empty data physical layer protocol data unit EHT sounding NDP, and extremely high reliability detection empty data physical layer protocol data unit UHR sounding NDP.

20. The method according to any one of claims 13 to 18, characterized in that The first indication information is reported through the second type of PPDU; the first indication information is carried in the long training field LTF field in the preamble code of the second type of PPDU.

21. The method according to any one of claims 13 to 18, characterized in that The first indication information is reported via a third type of PPDU; the first indication information is carried in a data field of the third type of PPDU.

22. The method according to claim 21, characterized in that The first indication information is carried in one or more LTF symbols in the data field.

23. The method according to claim 21, characterized in that The first indication information is reported via a CTS frame carried by the data field.

24. The method according to any one of claims 21 to 23, characterized in that The scrambling seed of the data field satisfies one or more of the following: predefined, pre-announced, and indicated by a trigger frame.

25. A method of wireless communication, characterized in that: include: In a first transmission opportunity TXOP, the access point AP receives a first uplink transmission from a first station STA; Among them, the first STA reserves one or more frequency domain units in the first uplink transmission, and the one or more frequency domain units are used for the second STA to report first indication information, and the first indication information is used to indicate: the second STA contains low-latency traffic to be transmitted, and / or, the second STA needs to preempt the first TXOP.

26. The method according to claim 25, characterized in that The first indication information is used to indicate that: one or more STAs among all STAs associated with the AP contain low-latency traffic to be transmitted, and / or, one or more STAs among all STAs associated with the AP need to seize the first TXOP.

27. The method according to claim 25, characterized in that The multiple STAs associated with the AP are divided into one or more STA groups, the one or more STA groups include a first STA group, the first STA group includes the second STA, and the first indication information is used to indicate: one or more STAs in the first STA group contain low-latency traffic to be transmitted, and / or, one or more STAs in the first STA group need to preempt the first TXOP.

28. The method according to claim 27, characterized in that Also includes: The AP sends a first trigger frame; The first trigger frame includes a first field, and the first field is used to indicate one or more of the following: the number of STAs in the first STA group and the number of the one or more STA groups.

29. The method according to claim 28, characterized in that The first trigger frame also includes a second field, where the second field is used to indicate a minimum association identifier of multiple STAs associated with the AP.

30. The method according to any one of claims 25 to 29, characterized in that The first uplink transmission is transmitted via a first type of physical layer protocol data unit PPDU; an LTF field in a preamble of the first type of PPDU is not uplink transmitted on the reserved one or more frequency domain units.

31. The method according to any one of claims 25 to 30, characterized in that The first indication information is reported through one or more of the following empty data physical layer transmission protocol data units NDP: efficient trigger feedback based empty data physical layer protocol data unit HE TB feedback NDP, efficient detection empty data physical layer protocol data unit HE sounding NDP, extremely high throughput detection empty data physical layer protocol data unit EHT sounding NDP, and extremely high reliability detection empty data physical layer protocol data unit UHR sounding NDP.

32. The method according to any one of claims 25 to 30, characterized in that The first indication information is reported through the second type of PPDU; the first indication information is carried in the long training field LTF field in the preamble code of the second type of PPDU.

33. The method according to any one of claims 25 to 30, characterized in that The first indication information is reported via a third type of PPDU; the first indication information is carried in a data field of the third type of PPDU.

34. The method according to claim 33, characterized in that The first indication information is carried in one or more LTF symbols in the data field.

35. The method according to claim 33, characterized in that The first indication information is reported via a CTS frame carried by the data field.

36. The method according to any one of claims 33 to 35, characterized in that The scrambling seed of the data field satisfies one or more of the following: predefined, pre-announced, and indicated by a trigger frame.

37. A communication device, characterized in that: The device is a first station STA, and the communication device includes: A sending unit, configured to send a first uplink transmission to an access point AP in a first transmission opportunity TXOP; Among them, the first STA reserves one or more frequency domain units in the first uplink transmission, and the one or more frequency domain units are used for the second STA to report first indication information, and the first indication information is used to indicate: the second STA contains low-latency traffic to be transmitted, and / or, the second STA needs to preempt the first TXOP.

38. The device according to claim 37, characterized in that The first indication information is used to indicate that: one or more STAs among all STAs associated with the AP contain low-latency traffic to be transmitted, and / or, one or more STAs among all STAs associated with the AP need to seize the first TXOP.

39. The device according to claim 37, characterized in that The multiple STAs associated with the AP are divided into one or more STA groups, the one or more STA groups include a first STA group, the first STA group includes the second STA, and the first indication information is used to indicate: one or more STAs in the first STA group contain low-latency traffic to be transmitted, and / or, one or more STAs in the first STA group need to preempt the first TXOP.

40. The device according to claim 39, characterized in that The device is also used to: receiving a first trigger frame; The first trigger frame includes a first field, and the first field is used to indicate one or more of the following: the number of STAs in the first STA group and the number of the one or more STA groups.

41. The device according to claim 40, characterized in that The first trigger frame also includes a second field, where the second field is used to indicate a minimum association identifier of multiple STAs associated with the AP.

42. The apparatus according to any one of claims 37 to 41, characterized in that The first uplink transmission is transmitted via a first type of physical layer protocol data unit PPDU; an LTF field in a preamble of the first type of PPDU is not uplink transmitted on the reserved one or more frequency domain units.

43. The apparatus according to any one of claims 37 to 42, characterized in that The first indication information is reported through one or more of the following empty data physical layer transmission protocol data units NDP: efficient trigger feedback based empty data physical layer protocol data unit HE TB feedback NDP, efficient detection empty data physical layer protocol data unit HE sounding NDP, extremely high throughput detection empty data physical layer protocol data unit EHT sounding NDP, and extremely high reliability detection empty data physical layer protocol data unit UHR sounding NDP.

44. The apparatus according to any one of claims 37 to 42, characterized in that The first indication information is reported through the second type of PPDU; the first indication information is carried in the long training field LTF field in the preamble code of the second type of PPDU.

45. The apparatus according to any one of claims 37 to 42, characterized in that The first indication information is reported via a third type of PPDU; the first indication information is carried in a data field of the third type of PPDU.

46. ​​The device according to claim 45, characterized in that The first indication information is carried in one or more LTF symbols in the data field.

47. The device according to claim 45, characterized in that The first indication information is reported via a CTS frame carried by the data field.

48. The apparatus according to any one of claims 45 to 47, characterized in that The scrambling seed of the data field satisfies one or more of the following: predefined, pre-announced, and indicated by a trigger frame.

49. A communication device, characterized in that: The device is a second station STA, and the device includes: A reporting unit, configured to report first indication information to an access point AP on one or more frequency domain units within a first transmission opportunity TXOP; The one or more frequency domain units are frequency domain resources reserved by the first STA in the first uplink transmission, and the first indication information is used to indicate that: the second STA contains low-latency traffic to be transmitted, and / or, the second STA needs to preempt the first TXOP.

50. The apparatus according to claim 49, characterized in that The first indication information is used to indicate that: one or more STAs among all STAs associated with the AP contain low-latency traffic to be transmitted, and / or, one or more STAs among all STAs associated with the AP need to seize the first TXOP.

51. The apparatus according to claim 49, characterized in that The multiple STAs associated with the AP are divided into one or more STA groups, the one or more STA groups include a first STA group, the first STA group includes the second STA, and the first indication information is used to indicate: one or more STAs in the first STA group contain low-latency traffic to be transmitted, and / or, one or more STAs in the first STA group need to preempt the first TXOP.

52. The device according to claim 51, characterized in that The device is also used to: receiving a first trigger frame; The first trigger frame includes a first field, and the first field is used to indicate one or more of the following: the number of STAs in the first STA group and the number of the one or more STA groups.

53. The device according to claim 52, characterized in that The first trigger frame also includes a second field, where the second field is used to indicate a minimum association identifier of multiple STAs associated with the AP.

54. The apparatus according to any one of claims 49 to 53, characterized in that The first uplink transmission is transmitted via a first type of physical layer protocol data unit PPDU; an LTF field in a preamble of the first type of PPDU is not uplink transmitted on the reserved one or more frequency domain units.

55. The apparatus according to any one of claims 49 to 54, characterized in that The first indication information is reported through one or more of the following empty data physical layer transmission protocol data units NDP: efficient trigger feedback based empty data physical layer protocol data unit HE TB feedback NDP, efficient detection empty data physical layer protocol data unit HE sounding NDP, extremely high throughput detection empty data physical layer protocol data unit EHT sounding NDP, and extremely high reliability detection empty data physical layer protocol data unit UHR sounding NDP.

56. The apparatus according to any one of claims 49 to 54, characterized in that The first indication information is reported through the second type of PPDU; the first indication information is carried in the long training field LTF field in the preamble code of the second type of PPDU.

57. The apparatus according to any one of claims 49 to 54, characterized in that The first indication information is reported via a third type of PPDU; the first indication information is carried in a data field of the third type of PPDU.

58. The device according to claim 57, characterized in that The first indication information is carried in one or more LTF symbols in the data field.

59. The device according to claim 57, characterized in that The first indication information is reported via a CTS frame carried by the data field.

60. The apparatus according to any one of claims 57 to 59, characterized in that The scrambling seed of the data field satisfies one or more of the following: predefined, pre-announced, and indicated by a trigger frame.

61. A communication device, characterized in that: The device is an access point AP, and the communication device includes: A receiving unit, configured to receive a first uplink transmission from a first station STA in a first transmission opportunity TXOP; Among them, the first STA reserves one or more frequency domain units in the first uplink transmission, and the one or more frequency domain units are used for the second STA to report first indication information, and the first indication information is used to indicate: the second STA contains low-latency traffic to be transmitted, and / or, the second STA needs to preempt the first TXOP.

62. The device according to claim 61, characterized in that The first indication information is used to indicate that: one or more STAs among all STAs associated with the AP contain low-latency traffic to be transmitted, and / or, one or more STAs among all STAs associated with the AP need to seize the first TXOP.

63. The device according to claim 61, characterized in that The multiple STAs associated with the AP are divided into one or more STA groups, the one or more STA groups include a first STA group, the first STA group includes the second STA, and the first indication information is used to indicate: one or more STAs in the first STA group contain low-latency traffic to be transmitted, and / or, one or more STAs in the first STA group need to preempt the first TXOP.

64. The device according to claim 63, characterized in that The device is also used for: Sending a first trigger frame; The first trigger frame includes a first field, and the first field is used to indicate one or more of the following: the number of STAs in the first STA group and the number of the one or more STA groups.

65. The device according to claim 64, characterized in that The first trigger frame also includes a second field, where the second field is used to indicate a minimum association identifier of multiple STAs associated with the AP.

66. The apparatus according to any one of claims 61 to 65, characterized in that The first uplink transmission is transmitted via a first type of physical layer protocol data unit PPDU; an LTF field in a preamble of the first type of PPDU is not uplink transmitted on the reserved one or more frequency domain units.

67. The apparatus according to any one of claims 61 to 66, characterized in that The first indication information is reported through one or more of the following empty data physical layer transmission protocol data units NDP: efficient trigger feedback based empty data physical layer protocol data unit HE TB feedback NDP, efficient detection empty data physical layer protocol data unit HE sounding NDP, extremely high throughput detection empty data physical layer protocol data unit EHT sounding NDP, and extremely high reliability detection empty data physical layer protocol data unit UHR sounding NDP.

68. The apparatus according to any one of claims 61 to 66, characterized in that The first indication information is reported through the second type of PPDU; the first indication information is carried in the long training field LTF field in the preamble code of the second type of PPDU.

69. The apparatus according to any one of claims 61 to 66, characterized in that The first indication information is reported via a third type of PPDU; the first indication information is carried in a data field of the third type of PPDU.

70. The device according to claim 69, characterized in that The first indication information is carried in one or more LTF symbols in the data field.

71. The apparatus according to claim 69, characterized in that The first indication information is reported via a CTS frame carried by the data field.

72. The apparatus according to any one of claims 69 to 71, characterized in that The scrambling seed of the data field satisfies one or more of the following: predefined, pre-announced, and indicated by a trigger frame.

73. A communication device, characterized in that: The device comprises a memory and a processor, wherein the memory is used to store a program, and the processor is used to call the program in the memory so that the communication device executes the method as described in any one of claims 1 to 36.

74. A device, characterized in that It comprises a processor, which is used to call a program from a memory so that the device executes the method as described in any one of claims 1-36.

75. A chip, characterized in that: It comprises a processor, which is used to call a program from a memory, so that a device equipped with the chip executes a method as described in any one of claims 1 to 36.

76. A computer-readable storage medium, characterized in that A program is stored thereon, the program causing a computer to execute the method according to any one of claims 1 to 36.

77. A computer program product, characterized in that The method comprises a program which causes a computer to execute the method according to any one of claims 1 to 36.

78. A computer program, characterized in that The computer program enables a computer to execute the method according to any one of claims 1 to 36.

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