CN113747589B

CN113747589B - Data transmission method, device and system and computer readable storage medium

Info

Publication number: CN113747589B
Application number: CN202010478154.7A
Authority: CN
Inventors: 冯冰; 白小飞; 王军辉
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2020-05-29
Filing date: 2020-05-29
Publication date: 2024-05-14
Anticipated expiration: 2040-05-29
Also published as: CN113747589A

Abstract

The application discloses a data transmission method, a data transmission device, a data transmission system and a computer readable storage medium, and belongs to the technical field of wireless communication. The first AP acquires STA association information of the second AP. The STA association information includes an identification of the STA associated with the second AP. The STA associated with the second AP includes a first STA. The second AP is the same as the first AP in its operating channel. The first AP transmits a scheduling frame on the operating channel. The schedule frame indicates that the first RU is allocated to the second STA and the second RU is allocated to the first STA. The second STA is associated with the first AP. The first AP receives, on the first RU, a frame transmitted by the second STA based on the scheduled frame. The application distributes channel resources for the associated STA of a plurality of APs through the scheduling frame sent by one AP, realizes the uplink OFDMA transmission of a plurality of STAs in a multi-AP scene, and expands the application range of the uplink OFDMA technology.

Description

Data transmission method, device and system and computer readable storage medium

Technical Field

The present application relates to the field of wireless communications technologies, and in particular, to a data transmission method, apparatus and system, and a computer readable storage medium.

Background

The wireless local area network (wireless local area network, WLAN) includes an Access Point (AP) and a Station (STA). The AP is used to provide bridging functions between the WLAN and other types of networks, such as wired networks. The STA designates a wireless terminal, such as a smart phone, a notebook computer, etc., provided with a WLAN access function.

The standard adopted by WLANs is the Institute of Electrical and Electronics Engineers (IEEE) 802.11 family of standards. An uplink orthogonal frequency division multiple access (orthogonal frequency division multiple access, OFDMA) technique was introduced in the IEEE 802.11ax protocol draft. The AP sends a trigger (trigger) frame, and the trigger frame carries the allocation information of the uplink scheduling resource. After receiving the trigger frame sent by the AP, the STA associated with the AP performs uplink data transmission by using the allocated scheduling resource after a short frame space (SIFS) based on the allocation information of the uplink scheduling resource carried in the trigger frame, that is, performs uplink OFDMA transmission. After receiving the uplink data sent by the STA, the AP replies a Block acknowledgement (Block acknowledgement, block ACK) frame to the STA after SIFS to acknowledge the reception of the uplink data sent by the STA.

However, the current uplink OFDMA technology can only realize uplink OFDMA transmission by a plurality of STAs in a single AP scenario, and has high application limitation.

Disclosure of Invention

The application provides a data transmission method, a data transmission device, a data transmission system and a computer readable storage medium, which can solve the problem of higher application limitation of the current uplink OFDMA technology.

In a first aspect, a data transmission method is provided, which is applied to a wireless local area network. The method comprises the following steps: the first AP acquires STA association information of the second AP. The STA association information includes an identification of the STA associated with the second AP. The STA associated with the second AP includes a first STA. The second AP is the same as the first AP in its operating channel. The first AP transmits a scheduling frame on the operating channel. The schedule frame indicates that the first RU is allocated to the second STA and the second RU is allocated to the first STA. That is, the schedule frame includes an indication of the first RU allocated to the second STA and an indication of the second RU allocated to the first STA. Wherein the second STA is associated with the first AP. The first AP receives, on the first RU, a frame transmitted by the second STA based on the scheduled frame.

In the application, the scheduling frame sent by the AP on the working channel comprises the RU of the associated STA of the AP and the RU of the associated STAs of other APs which are the same as the working channel of the AP, so that channel resources can be allocated to the associated STAs of a plurality of APs through the scheduling frame at the same time, the plurality of STAs can carry out uplink OFDMA transmission under the multi-AP scene, the application range of the uplink OFDMA technology is enlarged, and the resource utilization rate is also improved. In addition, the uplink frames are sent by the associated STAs of the plurality of APs through the scheduling frame sent by one AP, so that the channel resource consumption of the scheduling frame can be reduced.

Optionally, the first AP does not receive frames sent by the first STA based on the scheduled frames on the second RU.

In a first possible implementation, the schedule frame indicates that the second STA and the first STA each transmit data frames on the first RU and the second RU.

Optionally, after the first AP receives the frame sent by the second STA based on the schedule frame on the first RU, the first AP sends an acknowledgement frame to the second STA.

In the implementation manner, channel resources are allocated to the first STA and the second STA simultaneously through the scheduling frame sent by the first AP on the working channel, so that synchronous scheduling of the first STA and the second STA is realized, and the first STA and the second STA can synchronously send uplink data frames.

In a second possible implementation, the first AP sends a data frame to the second STA before the first AP sends the schedule frame. The starting time of the first AP for sending the data frame to the second STA is the same as the starting time of the second AP for sending the data frame to the first STA, and the ending time of the first AP for sending the data frame to the second STA is the same as the ending time of the second AP for sending the data frame to the first STA. The implementation process of the first AP transmitting the schedule frame includes: the first AP transmits a schedule frame after an interval SIFS from the end time, the schedule frame indicating that the second STA and the first STA each transmit an acknowledgement frame on the first RU and the second RU.

In the implementation manner, in a multi-AP downlink concurrent transmission scene, channel resources are allocated to the first STA and the second STA simultaneously through a scheduling frame sent by the first AP on a working channel, so that synchronous scheduling of the first STA and the second STA is realized, the first STA and the second STA can synchronously reply to a confirmation frame, and the response efficiency of the STA is improved.

In a third possible implementation, the first AP sends a Null Data Packet Announcement (NDPA) frame on the working channel before the first AP sends the scheduling frame. The NDPA frame indicates that the second AP transmits a first null data packet (null DATA PACKET, NDP) to the first STA after an interval SIFS from the NDPA frame. The first AP transmits a second NDP to the second STA after an interval SIFS from the NDPA frame. The implementation process of the first AP transmitting the schedule frame includes: the first AP transmits a scheduling frame after being spaced apart from the second NDP by SIFS. The schedule frame indicates that the second STA and the first STA each transmit channel measurements on the first RU and the second RU.

In the implementation manner, in an explicit channel measurement scene, channel resources are allocated to the first STA and the second STA simultaneously through a scheduling frame sent by the first AP on a working channel, so that synchronous scheduling of the first STA and the second STA is realized, the first STA and the second STA can synchronously feed back channel measurement results, and the transmission efficiency of the channel measurement results is improved.

Optionally, the STA association information further includes an uplink data amount to be transmitted of the first STA. The first AP determines a first RU based on the amount of uplink data to be transmitted of the second STA, and determines a second RU based on the amount of uplink data to be transmitted of the first STA.

Optionally, the scheduling frame includes an AP information element and a plurality of user information elements. Each user information element indicates allocation of RU to one STA. The AP information element indicates an associated AP of the STA to which the user information element corresponds.

Optionally, the schedule frame includes a plurality of user information elements, each user information element including an indication of RU allocated to one STA and an association indication indicating whether an AP transmitting the schedule frame is an associated AP of the STA to which the user information element corresponds.

Optionally, the second STA and the first STA meet a condition of non-interference, and the first RU overlaps with the second RU. Optionally, the second STA and the first STA meet a condition of non-interference, including: the second STA is located at a side of the first AP away from the second AP, and the first STA is located at a side of the second AP away from the first AP. And/or the received signal strength of the first AP to the first STA is smaller than a first threshold value, and the received signal strength of the second AP to the second STA is smaller than a second threshold value.

In the application, by distributing overlapped RUs for a plurality of STAs meeting the condition of no interference with each other, the uplink space multiplexing of the plurality of STAs is realized, and the utilization rate of channel resources is improved.

In a second aspect, a data transmission method is provided, which is applied to a wireless local area network. The method comprises the following steps: the STA receives the schedule frame sent by the unassociated AP on the STA's operating channel. The schedule frame indicates that the first RU is allocated to the first STA and the second RU is allocated to the second STA. Wherein the first STA is associated with the unassociated AP and the second STA is unassociated with the unassociated AP. When an indication of an RU allocated to the STA is included in the schedule frame, the STA transmits a frame to its associated AP on the RU based on the schedule frame.

Optionally, the schedule frame indicates that the first STA and the second STA each transmit one of a data frame, an acknowledgement frame, and a channel measurement on the first RU and the second RU.

Optionally, after receiving the schedule frame sent by the non-associated AP on the working channel of the STA, the STA determines the target transmit power of the STA according to the historical path loss information between the STA and the associated AP, where the historical path loss information is independent of the power of the schedule frame. The STA transmits a frame to the associated AP on the RU based on the schedule frame, comprising: the STA transmits a frame on the RU to the associated AP using the target transmit power. The power of the schedule frame includes the transmitting power of the AP transmitting the schedule frame and the RSSI value of the STA receiving the schedule frame.

In the application, since the scheduling frame received by the STA is sent by the non-associated AP of the STA, the STA cannot estimate the downlink path loss from the associated AP of the STA to the STA according to the scheduling frame. In this case, the STA determines the transmit power of the STA using the history path loss information with the associated AP, and the reliability of transmitting the frame to the associated AP by the STA can be ensured.

In a third aspect, a data transmission apparatus is provided. The apparatus comprises a plurality of functional modules that interact to implement the method of the first aspect and embodiments thereof described above. The plurality of functional modules may be implemented based on software, hardware, or a combination of software and hardware, and the plurality of functional modules may be arbitrarily combined or divided based on the specific implementation.

In a fourth aspect, a data transmission apparatus is provided. The apparatus comprises a plurality of functional modules that interact to implement the method of the second aspect and embodiments thereof described above. The plurality of functional modules may be implemented based on software, hardware, or a combination of software and hardware, and the plurality of functional modules may be arbitrarily combined or divided based on the specific implementation.

In a fifth aspect, there is provided an AP, including: a processor and a memory;

the memory is used for storing a computer program, and the computer program comprises program instructions;

the processor is configured to invoke the computer program to implement the data transmission method according to any one of the first aspects.

In a sixth aspect, there is provided a STA comprising: a processor and a memory;

The processor is configured to invoke the computer program to implement the data transmission method according to any of the second aspects.

In a seventh aspect, there is provided a data transmission system comprising: a plurality of APs and a plurality of STAs. The operating channels of the plurality of APs are the same. The plurality of APs includes a target AP, the target AP includes the data transmission device according to the third aspect or is the AP according to the fifth aspect, and the STA includes the data transmission device according to the fourth aspect or is the STA according to the sixth aspect.

In an eighth aspect, there is provided a computer readable storage medium having instructions stored thereon which, when executed by a processor of a computer device, implement a data transmission method according to any of the first or second aspects.

In a ninth aspect, a chip is provided, the chip comprising programmable logic circuits and/or program instructions, which when the chip is run, implement the method of the first or second aspect and embodiments thereof.

The technical scheme provided by the application has the beneficial effects that at least:

The AP sends a scheduling frame on the working channel, and the scheduling frame comprises RUs of associated STAs of the AP and RUs of associated STAs of other APs which are the same as the working channel of the AP, so that channel resources can be allocated to the associated STAs of a plurality of APs through the scheduling frame at the same time, uplink OFDMA transmission of the plurality of STAs in a multi-AP scene is realized, the application range of an uplink OFDMA technology is expanded, and the resource utilization rate is also improved. In addition, the uplink frames are sent by the associated STAs of the plurality of APs through the scheduling frame sent by one AP, so that the channel resource consumption of the scheduling frame can be reduced.

Drawings

FIG. 1 is a schematic diagram of the structure of a trigger frame defined in the IEEE 802.11ax protocol draft;

Fig. 2 is a schematic structural diagram of a data transmission system according to an embodiment of the present application;

fig. 3 is a schematic flow chart of a data transmission method according to an embodiment of the present application;

fig. 4 is a schematic structural diagram of a scheduling frame according to an embodiment of the present application;

Fig. 5 is a schematic diagram of a frame transmission sequence according to an embodiment of the present application;

fig. 6 is a schematic diagram of another frame transmission sequence provided in an embodiment of the present application;

FIG. 7 is a schematic diagram of another frame transmission sequence according to an embodiment of the present application;

fig. 8 is a flow chart of another data transmission method according to an embodiment of the present application;

Fig. 9 is a flowchart of another data transmission method according to an embodiment of the present application;

fig. 10 is a schematic structural diagram of a data transmission device according to an embodiment of the present application;

fig. 11 is a schematic structural diagram of another data transmission device according to an embodiment of the present application;

Fig. 12 is a schematic structural view of yet another data transmission device according to an embodiment of the present application;

Fig. 13 is a schematic structural view of still another data transmission device according to an embodiment of the present application;

fig. 14 is a block diagram of a data transmission device according to an embodiment of the present application.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the present application more apparent, the embodiments of the present application will be described in further detail with reference to the accompanying drawings.

The radio frequency range used by WLANs is defined in the IEEE 802.11 family of standards, being the 2.4 gigahertz (GHz) band and the 5GHz band. Wherein the 2.4GHz band includes 2.4GHz to 2.4835GHz, and the 5GHz band includes 5.150GHz to 5.350GHz and 5.725GHz to 5.850GHz. To avoid co-channel interference problems, the available frequency bands in WLANs are divided into separate channels, i.e. there is no overlap of frequency bands between the channels. For example, the 2.4GHz band has 3 independent channels, i.e., three different frequency WLANs can be deployed simultaneously in the 2.4GHz band.

Because of the limited signal coverage of a single AP, in high-density deployment scenarios such as offices, canteens, airports, and train stations, multiple APs are typically deployed to meet the signal coverage requirements. Because of the limited number of independent channels in WLAN, it cannot be satisfied that all APs are deployed on different frequencies (i.e., each AP uses an independent channel), so that some APs need to be deployed on the same frequency (i.e., some APs use the same working channel).

In the OFDMA technology defined by the IEEE 802.11ax protocol draft, resources of one channel are divided into a plurality of Resource Units (RUs) orthogonal to each other. Multiple STAs can simultaneously transmit data by occupying different RUs. For example, a 20 megahertz (MHz) channel contains 256 subcarriers (subcarriers). These subcarriers constitute a number of subchannels, one of which may be referred to as one RU. In the IEEE 802.11ax protocol draft definition, on a 20MHz channel, STAs can use 4 different sizes of RUs, including 26 subcarriers, 52 subcarriers, 106 subcarriers, and 242 subcarriers, respectively, corresponding to channel bandwidths of 2MHz, 4MHz, 8MHz, and 20MHz, respectively. The AP determines how many RUs are used in a 20MHz channel and the location and size of the RU used.

In the IEEE 802.11ax protocol draft, an AP may allocate an entire channel to one STA, or may divide a resource of one channel into a plurality of RUs and simultaneously allocate the RUs to a plurality of STAs by using an OFDMA technique. For example, the AP allocates one RU including 106 subcarriers to one STA and allocates one RU including 26 subcarriers to the other three STAs, respectively, and the AP can communicate with 4 STAs simultaneously using channel bandwidths of 8MHz and 3 channel bandwidths of 2MHz, respectively.

A trigger frame (trigger frame) is defined in the IEEE 802.11ax protocol draft. Fig. 1 is a schematic diagram of the structure of a trigger frame defined in the IEEE 802.11ax protocol draft. As shown in fig. 1, the trigger frame includes a frame control (frame control) field, a frame length (duration) field, a receiver address (RECEIVER ADDRESS, RA) field, a sender address (TRANSMITTER ADDRESS, TA) field, a common information (common info) field, a user info list field, a padding (padding) field (optional), a frame check Sequence (FRAME CHECK Sequence, FCS) field, and the like. Wherein the frame control field, the frame length field, the RA field and the TA field belong to a frame header. The TA field is used to populate the Basic Service Set (BSS) identity of the AP. Referring to fig. 1, the user information list field includes n user information elements (user info element), n being a positive integer. Each user information element includes an RU allocated to one STA. In the embodiment of the application, the RU allocated to the STA by the AP comprises the related information such as the position and the size of the RU. Optionally, the user information element specifically includes: a field indicating a length (UL length) of data to be uplink-transmitted, a field indicating a maximum bandwidth (UL BW) supported by uplink, a field indicating information related to RU (RU allocation) (i.e., an indication of RU) employed when the scheduled STA uplink-transmits data, and a spatial stream allocation (SS allocation) field. The explanation of each field of the trigger frame is not repeated here.

Fig. 2 is a schematic structural diagram of a data transmission system according to an embodiment of the present application. As shown in fig. 2, the data transmission system includes: APs 101A-101B (collectively referred to as AP 101) and STAs 102A-102D (collectively referred to as STAs 102). Wherein STA102A and STA102B are associated with AP101A, and STA102C and STA102D are associated with AP101B. The working channels of the AP101A and the AP101B are the same, i.e. the AP101A and the AP101B are deployed in the same frequency. The STA is associated with the AP, meaning that the STA is wirelessly connected to the AP, i.e., the STA is capable of wireless communication with the AP. The AP is configured to provide wireless access services based on WLAN protocols for STAs associated with the AP. The numbers of APs and STAs in the figures are used as exemplary illustrations only, and are not limiting of the data transmission system provided by the embodiments of the present application.

The AP 101 is a network device having a WLAN chip or a WLAN system on a chip (SoC). For example, the AP 101 may be a router or a switch, etc. The STA102 is a wireless terminal with a WLAN chip, for example, the STA102 may be a smart phone, a notebook computer, a smart wearable device, or the like.

Alternatively, the AP101A and the AP101B may be connected by a wired connection directly or indirectly. Information interaction is performed between the AP101A and the AP101B in a wired mode, so that information interaction efficiency between the AP101A and the AP101B can be guaranteed. For example, referring to fig. 2, AP101a and AP101B access a two-tier network (including an access tier and a convergence tier). The AP101A is connected with the access layer switch 103A in a wired manner, the AP101B is connected with the access layer switch 103B in a wired manner, and the access layer switch 103A and the access layer switch 103B are connected with the convergence layer switch 104 in a wired manner respectively, that is, the AP101A and the AP101B are connected with each other in a wired manner through the access layer switch 103A, the convergence layer switch 104 and the access layer switch 103B. Or the AP101A and the AP101B may be connected by a network controller through a wire. Alternatively, the AP101A and the AP101B may be connected wirelessly. The embodiment of the application does not limit the specific connection mode between the APs.

The embodiment of the application provides a data transmission method which can be applied to a data transmission system shown in fig. 2. For convenience of explanation, the embodiment of the present application will be described by taking a data transmission system including AP1, AP2, STA1 and STA2 as an example. Wherein, the working channel of the AP1 and the working channel of the AP2 are the same, the STA1 is associated with the AP1, and the STA2 is associated with the AP 2.

Fig. 3 is a flow chart of a data transmission method according to an embodiment of the present application. As shown in fig. 3, the method includes:

Step 301, the AP1 acquires STA association information of the AP 2.

The STA association information for AP2 includes an identification of the STA associated with AP 2. In the embodiment of the present application, the STA association information of the AP2 includes the identifier of the STA 2. Optionally, the identification of the STA is an association identifier (association identifier, AID) or a medium access control (Medium Access Control, MAC) address of the STA, etc. assigned to the STA by the AP.

Optionally, the STA association information of the AP2 further includes an uplink data amount to be transmitted by the STA 2. Alternatively, the AP2 periodically transmits the uplink data amount to be transmitted of the STA2 to the AP1, or the AP2 transmits the latest uplink data amount to be transmitted of the STA2 to the AP1 whenever the variation value of the uplink data amount to be transmitted of the STA2 exceeds a preset value. The amount of uplink data to be transmitted of the STA2 may be a queue length of the uplink data to be transmitted of the STA 2. The STA association information of the AP2 may further include an uplink transmission rate of the STA2 to the AP2, and the like.

After the AP1 acquires STA association information of the AP2, the AP1 determines RU1 based on the uplink data amount to be transmitted of the STA1, and determines RU2 based on the uplink data amount to be transmitted of the STA 2. Optionally, the size of RU allocated by the AP to the STA is positively correlated with the amount of uplink data to be transmitted by the STA, that is, the larger the amount of uplink data to be transmitted by the STA, the larger RU allocated by the AP to the STA. RU1 and RU2 may be the same size, e.g., RU1 and RU2 each comprise 52 subcarriers. Or RU1 and RU2 may be different in size, e.g., RU1 contains 26 subcarriers and RU2 contains 52 subcarriers.

Or the AP may determine the RU allocated to the STA according to the service priority of the data to be transmitted in the uplink of the STA. For example, the higher the traffic priority of uplink data to be transmitted by a STA, the larger RU the AP allocates to the STA.

Alternatively, STA1 and STA2 satisfy the condition of non-interference with each other, and RU1 overlaps RU 2. RU1 overlaps RU2, meaning that the subcarriers included in RU1 and the subcarriers included in RU2 are partially or completely identical. STA1 and STA2 satisfy the condition of mutually noninterfere, include: STA1 is located on the side of AP1 away from AP2, and STA2 is located on the side of AP2 away from AP 1; and/or, the received signal strength of the AP1 to the STA2 is less than the first threshold, and the received signal strength of the AP2 to the STA1 is less than the second threshold.

In the embodiment of the application, the overlapped RUs are allocated for the plurality of STAs meeting the condition of no interference with each other, so that the uplink space multiplexing of the plurality of STAs is realized, and the utilization rate of channel resources is improved.

Or RU1 and RU2 may not overlap, that is, the subcarriers included in RU1 are different from the subcarriers included in RU2, so that co-channel interference can be avoided.

Step 302, the AP1 transmits a scheduling frame on the working channel.

The schedule frame includes an indication of RU1 allocated to STA1 and an indication of RU2 allocated to STA 2. Since the working channel of AP1 is the same as the working channel of AP2, both STA1 and STA2 can receive the scheduled frame sent by AP1 on the working channel. Optionally, the schedule frame indicates that STA1 and STA2 each transmit one of a data frame, an acknowledgement frame, and a channel measurement result on RU1 and RU 2.

Step 303, STA1 transmits a frame to AP1 on RU1 based on the schedule frame.

STA1, upon receiving the schedule frame, determines the channel resource allocated to STA1 as RU1 based on the schedule frame, and then transmits a frame of the type indicated by the schedule frame to AP1 on RU1 after SIFS. After the AP1 transmits the schedule frame on the working channel, the STA1 receives the frame transmitted based on the schedule frame on the RU1 and does not receive the frame transmitted by the STA2 based on the schedule frame on the RU 2.

Optionally, after STA1 receives the schedule frame on the working channel, estimating the downlink path loss from AP1 to STA1 based on the power of the schedule frame, determining a target transmit power according to the estimated downlink path loss and a target Received Signal Strength Indication (RSSI) value, and then transmitting the frame to AP1 on RU1 using the target transmit power. The power of the schedule frame includes the transmitting power of the AP1 transmitting the schedule frame and the RSSI value of the STA1 receiving the schedule frame. The target RSSI value and the transmit power of the AP1 transmitting the schedule frame may be carried in the schedule frame.

Step 304, STA2 sends a frame to AP2 on RU2 based on the schedule frame.

After receiving the schedule frame, STA2 determines that the channel resource allocated to STA2 is RU2 based on the schedule frame, and then transmits a frame of the type indicated by the schedule frame to AP2 on RU2 after SIFS. After determining that the channel resource allocated to STA2 by AP1 is RU2, AP2 receives, on RU2, a frame transmitted by STA2 based on the schedule frame.

Alternatively, the AP2 receives the schedule frame transmitted by the AP1 on the working channel, and determines the channel resource allocated to the STA2 as RU2 based on the schedule frame. Or the AP1 transmits channel resource allocation information of the STA2 to the AP2 through the wired network after determining the channel resources allocated to the STA 2. The embodiment of the present application is not limited thereto.

Optionally, after receiving the schedule frame on the working channel, the STA2 determines the target transmit power of the STA2 according to the historical path loss information between the STA2 and the AP2, where the historical path loss information is independent of the power of the schedule frame. Then, STA2 transmits a frame to AP2 on RU2 using the target transmit power. The power of the schedule frame includes the transmitting power of the AP1 transmitting the schedule frame and the RSSI value of the STA2 receiving the schedule frame.

In the embodiment of the present application, since the AP1 is a non-associated AP of the STA2, the STA2 cannot estimate the downlink path loss from the associated AP of the STA2 (i.e. the AP 2) to the STA2 according to the scheduling frame sent by the AP1, and in this case, the STA2 uses the historical path loss information between the STA2 and the AP2 to determine the transmitting power of the STA2, so that the reliability of the STA2 sending the frame to the AP2 can be ensured.

In the data transmission method provided by the embodiment of the application, the AP sends the scheduling frame on the working channel, and the scheduling frame comprises the RU of the associated STA of the AP and the RU of the associated STAs of other APs which are the same as the working channel of the AP, so that channel resources can be allocated to the associated STAs of a plurality of APs through the scheduling frame at the same time, the plurality of STAs can carry out uplink OFDMA transmission in a multi-AP scene, the application range of an uplink OFDMA technology is enlarged, and the resource utilization rate is also improved. In addition, the uplink frames are sent by the associated STAs of the plurality of APs through the scheduling frame sent by one AP, so that the channel resource consumption of the scheduling frame can be reduced.

Optionally, the scheduling frame includes an AP information element and a plurality of user information elements. Each user information element includes an indication of an RU allocated to one STA, i.e., each user information element indicates that an RU is allocated to one STA. The AP information element indicates an associated AP of the STA to which the user information element corresponds. The schedule frame may be extended by a trigger frame defined in the draft of the IEEE 802.11ax protocol. Fig. 4 is a schematic structural diagram of a scheduling frame according to an embodiment of the present application. As shown in fig. 4, the schedule frame includes a plurality of AP information elements (AP information elements 1-m) and a plurality of user information elements (user information elements 1-n), where n and m are integers greater than 1. Each AP information element includes an identification of an AP. The identification of the AP may be a MAC address of the AP or other information capable of uniquely identifying the AP in the data transmission system, for example, the identification of the AP may also be a BSS identification when the AP in the data transmission system belongs to a different BSS. Each AP information element is configured to indicate an associated AP of a STA corresponding to a user information element located after the AP information element. Referring to fig. 4, an AP information element 1 is used to indicate an associated AP of a STA corresponding to a user information element 1 and a user information element 2, and an AP information element m is used to indicate an associated AP of a STA corresponding to a user information element n. For example, in the embodiment of the present application, one AP information element includes an identification of AP1, and a user information element located after the AP information element includes an indication of RU1 allocated to STA 1; another AP information element includes an identification of AP2, and a user information element located after the AP information element includes an indication of RU2 allocated to STA 2. The explanation of other fields in the scheduling frame may refer to the field explanation of the trigger frame defined in the IEEE 802.11ax protocol draft, and the embodiments of the present application are not described herein in detail.

In the embodiment of the application, the scheduling frame comprises the AP information element and the user information element, so that the scheduling frame can be used for scheduling which STAs of which APs can be determined based on the scheduling frame. After receiving the scheduling frame on the working channel, the AP firstly judges whether the AP information element of the scheduling frame comprises the identification of the AP information element; when the AP information element of the schedule frame includes its own identifier, the AP prepares to receive the uplink frame of the associated STA of the AP on the RU indicated by the corresponding user information element. After receiving a scheduling frame on a working channel, an STA firstly judges whether an AP information element of the scheduling frame comprises an identification of an associated AP of the STA; when the AP information element of the schedule frame includes the identification of the associated AP of the STA, the STA again checks whether the user information element of the schedule frame includes the RU allocated to itself.

In one possible implementation, each AP in the data transmission system assigns an AID to a STA associated with that AP. That is, the AID of STA1 is allocated by AP1, and the AID of STA2 is allocated by AP 2. In this case, the AID of STA1 may be the same as the AID of STA 2. In this implementation, a schedule frame as shown in fig. 4 may be employed. In combination with the AP information element and the user information element, it can be determined which STA of which AP the RU in the user information element is specifically allocated to.

In another possible implementation, the AIDs of all STAs in the data transmission system are uniformly allocated, and the AIDs of different STAs are different. Namely, the AID of STA1 and the AID of STA2 are uniformly allocated, and the AID of STA1 is different from the AID of STA 2. In this implementation, a trigger frame as shown in fig. 1 may be employed as the schedule frame or a schedule frame as shown in fig. 4 may be employed.

Optionally, when a trigger frame as shown in fig. 1 is used as a scheduling frame, the APs negotiate in advance about the AP participating in the uplink OFDMA transmission through a wired network, and interact the related information of the RU allocated to the associated STA of the AP through the wired network, and then the AP prepares to receive the uplink data of the associated STA of the AP on the corresponding RU. The mode does not need to change the trigger frame defined in the IEEE802.11ax protocol draft, and has high compatibility.

Optionally, each user information element in the schedule frame further includes an association indication, where the association indication is used to indicate whether the AP that sends the schedule frame is an associated AP of the STA to which the user information element corresponds.

The multiple APs in the data transmission system provided by the embodiment of the present application may belong to the same BSS, or may also belong to different BSSs. Since the AP generally uses the BSS identifier as the sender address, when multiple APs belong to the same BSS, i.e., the BSS identifiers of the multiple APs are the same, the STA cannot distinguish whether the AP that sends the scheduling frame is its associated AP according to the content of the TA field. In this case, an association indication may be added to the user information element of the schedule frame, and by the association indication, whether the AP that transmits the schedule frame is an association AP of the STA corresponding to the user information element may be indicated. Optionally, the association indicates a length of 1 bit. The associated indication may be represented by a numerical value, a character, a letter, or the like. For example, the association indication in the user information element is "1", which indicates that the AP that sends the scheduling frame is the associated AP of the STA corresponding to the user information element; the association indication in the user information element is "0", which indicates that the AP that transmits the schedule frame is not the associated AP of the STA to which the user information element corresponds. For example, in the embodiment of the present application, in the scheduling frame sent by the AP1, the association indication in the user information element corresponding to the STA1 is "1", and the association indication in the user information element corresponding to the STA2 is "0".

Optionally, the scheduling frame provided by the embodiment of the present application is used for scheduling the STA to send a data frame, an acknowledgement frame or a channel measurement result.

In a first alternative embodiment of the application, the schedule frame transmitted by AP1 on the operating channel instructs STA1 and STA2 to transmit data frames on RU1 and RU2, respectively. Alternatively, RU1 is determined based on the amount of uplink data to be transmitted by STA1, and RU2 is determined based on the amount of uplink data to be transmitted by STA 2. After receiving the data frame sent by the STA1 on the RU1, the AP1 sends an acknowledgement frame to the STA 1; after receiving the data frame sent by STA2 in RU2, AP2 sends an acknowledgement frame to STA 2. The data frame is a physical layer protocol data unit (PHYSICAL LAYER protocol data unit, PPDU) and the acknowledgement frame is a BA frame.

Fig. 5 is a schematic diagram of a frame transmission sequence according to an embodiment of the present application. As shown in fig. 5, the AP1 transmits a schedule frame. STA1 transmits an uplink PPDU1 to AP1 on RU1 after SIFS, and STA2 transmits an uplink PPDU2 to AP2 on RU2 after SIFS. AP1 replies BA frame 1 to STA1 after SIFS interval from PPDU1, and AP2 replies BA frame 2 to STA2 after SIFS interval from PPDU2.

In the embodiment of the application, channel resources are allocated to the STA1 and the STA2 simultaneously through the scheduling frame sent by the AP1 on the working channel, so that synchronous scheduling of the STA1 and the STA2 is realized, and the STA1 and the STA2 can synchronously send uplink data frames.

In a second alternative embodiment of the application, the schedule frame transmitted by AP1 on the operating channel instructs STA1 and STA2 to transmit acknowledgement frames on RU1 and RU2, respectively. Alternatively, RU1 and RU2 are equal in size. The method comprises the steps that an AP1 sends a data frame to an STA1, an AP2 sends a data frame to an STA2, wherein the starting time of the data frame sent by the AP1 to the STA1 is identical to the starting time of the data frame sent by the AP2 to the STA2, and the ending time of the data frame sent by the AP1 to the STA1 is identical to the ending time of the data frame sent by the AP2 to the STA2, namely, the AP1 and the AP2 are in downlink concurrent transmission. The AP1 transmits the schedule frame after an interval SIFS from the end time. The schedule frame may be a multi-user block acknowledgement request (MU-BAR) trigger frame.

Fig. 6 is a schematic diagram of another frame transmission sequence according to an embodiment of the present application. As shown in fig. 6, the AP1 transmits a trigger frame. The AP1 transmits the downlink PPDU1 to the STA1 after the SIFS with the trigger frame interval, and the AP2 transmits the downlink PPDU2 to the STA2 after the SIFS with the trigger frame interval, wherein the transmission start time and the transmission end time of the downlink PPDU1 and the downlink PPDU2 are the same. The AP1 transmits the MU-BAR trigger frame after an SIFS interval from the downlink PPDU 1. STA1 sends an acknowledgement frame 1 to AP1 on RU1 after SIFS with MU-BAR trigger frame interval, STA2 sends an acknowledgement frame 2 to AP2 on RU2 after SIFS with MU-BAR trigger frame interval.

In the embodiment of the application, in a multi-AP downlink concurrent transmission scene, channel resources are allocated to the STA1 and the STA2 simultaneously through the scheduling frame sent by the AP1 on the working channel, so that synchronous scheduling of the STA1 and the STA2 is realized, the STA1 and the STA2 can synchronously reply to the confirmation frame, and the response efficiency of the STA is improved.

In a third alternative embodiment of the present application, the schedule frame transmitted by AP1 on the operating channel instructs STA1 and STA2 to transmit channel measurements on RU1 and RU2, respectively. Alternatively, RU1 and RU2 are equal in size. In the dominant channel measurement process of a single AP, the AP firstly transmits an NDPA frame to the STA, then transmits an NDP to the STA, the STA measures the channel information from the AP to the STA according to the received NDP, and then the STA transmits a channel measurement result to the AP. In the embodiment of the present application, AP1 transmits an NDPA frame on the working channel, and the NDPA frame instructs AP2 to transmit NDP2 to STA1 after an interval NDPA frame SIFS. AP1 transmits NDP1 to STA1 after an interval NDPA frame SIFS. Then, the AP1 transmits the schedule frame after spacing SIFS from NDP1.

Fig. 7 is a schematic diagram of still another frame transmission sequence according to an embodiment of the present application. As shown in fig. 7, the AP1 transmits an NDPA frame. AP1 transmits NDP1 to STA1 after SIFS, and AP2 transmits NDP2 to STA2 after SIFS. AP1 transmits a schedule frame after an SIFS interval from NDP 1. STA1 transmits channel measurement result 1 of AP1 to STA1 on RU1 after SIFS with a scheduling frame interval, STA2 transmits channel measurement result 2 of AP2 to STA2 on RU2 after SIFS with a scheduling frame interval.

In the embodiment of the application, under the dominant channel measurement scene, channel resources are allocated to the STA1 and the STA2 simultaneously through the scheduling frame sent by the AP1 on the working channel, so that the synchronous scheduling of the STA1 and the STA2 is realized, the STA1 and the STA2 can synchronously feed back the channel measurement result, and the transmission efficiency of the channel measurement result is improved.

The sequence of the steps of the data transmission method provided by the embodiment of the application can be properly adjusted, and the steps can be correspondingly increased or decreased according to the situation. Any method that can be easily conceived by those skilled in the art within the technical scope of the present disclosure should be covered in the protection scope of the present application, and thus will not be repeated.

In summary, in the data transmission method provided by the embodiment of the present application, the AP sends the scheduling frame on the working channel, and because the scheduling frame includes the RU of the associated STA of the AP and the RU of the associated STA of other APs identical to the working channel of the AP, channel resources can be allocated to the associated STAs of multiple APs at the same time through the scheduling frame, so that uplink OFDMA transmission by multiple STAs in a multi-AP scenario is implemented, the application range of the uplink OFDMA technology is expanded, and the resource utilization rate is also improved. In addition, the uplink frames are sent by the associated STAs of the plurality of APs through the scheduling frame sent by one AP, so that the channel resource consumption of the scheduling frame can be reduced.

Fig. 8 is a flowchart of another data transmission method according to an embodiment of the present application. The data transmission system applying the method at least comprises a first AP, a second AP, a first STA and a second STA. For example, the first AP may be the AP101A in the data transmission system as shown in fig. 2, the second AP may be the AP101B in the data transmission system as shown in fig. 2, the first STA may be the STA102C or the STA102D in the data transmission system as shown in fig. 2, and the second STA may be the STA102A or the STA102B in the data transmission system as shown in fig. 2. The method may be used in particular to implement the method shown in the corresponding embodiment of fig. 3. As shown in fig. 8, the method includes:

In step 801, the first AP acquires STA association information of the second AP, where the STA association information includes an identifier of an STA associated with the second AP, and the STA associated with the second AP includes the first STA, and the second AP is the same as the working channel of the first AP.

In step 802, the first AP transmits a schedule frame on the working channel, the schedule frame indicating to assign the first RU to the second STA and to assign the second RU to the first STA.

Wherein the second STA is associated with the first AP.

In step 803, the first AP receives, on the first RU, a frame transmitted by the second STA based on the scheduled frame.

When the method is specifically used to implement the method as shown in the corresponding embodiment of fig. 3, the first AP may be, for example, AP1, the second AP may be, for example, AP2, the first STA may be, for example, STA2, the second STA may be, for example, STA1, the first RU may be, for example, RU1, and the second RU may be, for example, RU2. The specific implementation process of steps 801 to 803 may refer to the related description in the embodiment shown in fig. 3, and will not be repeated here.

In a first alternative embodiment of the application, the schedule frame indicates that the second STA and the first STA each transmit data frames on the first RU and the second RU.

In a second alternative embodiment of the application, the first AP transmits a data frame to the second STA before the first AP transmits the schedule frame. The starting time of the first AP for sending the data frame to the second STA is the same as the starting time of the second AP for sending the data frame to the first STA, and the ending time of the first AP for sending the data frame to the second STA is the same as the ending time of the second AP for sending the data frame to the first STA. The first AP transmits a schedule frame comprising: the first AP transmits a schedule frame after an interval SIFS from the end time, the schedule frame indicating that the second STA and the first STA each transmit an acknowledgement frame on the first RU and the second RU.

In a third alternative embodiment of the present application, the first AP transmits an NDPA frame on the operating channel before the first AP transmits the schedule frame, the NDPA frame indicating that the second AP transmits the first NDP to the first STA after an SIFS interval from the NDPA frame. The first AP transmits a second NDP to the second STA after an interval SIFS from the NDPA frame. The first AP transmits a schedule frame comprising: the first AP transmits a schedule frame after an SIFS interval from the second NDP, the schedule frame indicating that the second STA and the first STA each transmit channel measurements on the first RU and the second RU. When the method is specifically used to implement the method described in the corresponding embodiment shown in fig. 3, the first NDP may be, for example, NDP2, and the second NDP may be, for example, NDP1.

Optionally, the STA association information further includes an uplink data amount to be transmitted by the first STA. The first AP also determines a first RU based on the amount of uplink data to be transmitted by the second STA and determines a second RU based on the amount of uplink data to be transmitted by the first STA.

Optionally, the schedule frame includes an AP information element and a plurality of user information elements, each user information element indicating that an RU is allocated to one STA, the AP information element indicating an associated AP of the STA to which the user information element corresponds.

Optionally, the schedule frame includes a plurality of user information elements, where each user information element includes an indication of RU allocated to one STA and an association indication, where the association indication is used to indicate whether an AP that sends the schedule frame is an associated AP of the STA to which the user information element corresponds.

Optionally, the second STA and the first STA meet a condition of non-interference, and the first RU overlaps with the second RU.

Fig. 9 is a flowchart of another data transmission method according to an embodiment of the present application. The data transmission system applying the method at least comprises two APs, a first STA and a second STA. For example, the two APs may be the AP101A and the AP101B in the data transmission system as shown in fig. 2, respectively, the first STA may be the STA102C or the STA102D in the data transmission system as shown in fig. 2, and the second STA may be the STA102A or the STA102B in the data transmission system as shown in fig. 2. The method may be used in particular to implement the method shown in the corresponding embodiment of fig. 3. As shown in fig. 9, the method includes:

In step 901, the STA receives a schedule frame sent by the non-associated AP on the working channel of the STA, where the schedule frame indicates to allocate a first RU to the first STA and a second RU to the second STA.

Wherein the first STA is associated with the unassociated AP and the second STA is unassociated with the unassociated AP.

Step 902, when the schedule frame includes an indication of an RU allocated to the STA, the STA transmits a frame to an associated AP of the STA on the RU based on the schedule frame.

When the method is specifically used to implement the method as shown in the corresponding embodiment of fig. 3, the STA and the second STA may be, for example, STA2, the non-associated AP of the STA may be, for example, AP1, the associated AP of the STA may be, for example, AP2, the first STA may be, for example, STA1, the first RU may be, for example, RU1, and the second RU may be, for example, RU2. The specific implementation process of steps 901 to 902 may refer to the related description in the embodiment shown in fig. 3, and will not be described herein.

Optionally, after receiving the schedule frame sent by the non-associated AP on the working channel of the STA, the STA determines the target transmit power of the STA according to the historical path loss information between the STA and the associated AP, where the historical path loss information is independent of the power of the schedule frame. The STA transmits a frame to the associated AP on the RU based on the schedule frame, including: the STA transmits a frame on the RU to the associated AP using the target transmit power.

Fig. 10 is a schematic structural diagram of a data transmission device according to an embodiment of the present application. The method is applied to a first AP in the wireless local area network. As shown in fig. 10, the apparatus 100 includes:

the obtaining module 1001 is configured to obtain STA association information of a second AP, where the STA association information includes an identification of an STA associated with the second AP, and the STA associated with the second AP includes a first STA, and the second AP is the same as an operating channel of the first AP.

A transmitting module 1002 is configured to transmit a scheduling frame on the working channel, where the scheduling frame indicates to assign a first RU to a second STA and assign a second RU to the first STA, and the second STA is associated with the first AP.

A receiving module 1003 is configured to receive, on the first RU, a frame sent by the second STA based on the scheduled frame.

Optionally, the receiving module 1003 is further configured to not receive, on the second RU, a frame sent by the first STA based on the scheduled frame.

Optionally, the schedule frame indicates that the second STA and the first STA each transmit data frames on the first RU and the second RU.

Optionally, the sending module 1002 is further configured to: transmitting a data frame to a second STA, wherein the starting time of the data frame transmitted by the first AP to the second STA is the same as the starting time of the data frame transmitted by the second AP to the first STA, and the ending time of the data frame transmitted by the first AP to the second STA is the same as the ending time of the data frame transmitted by the second AP to the first STA; a schedule frame is transmitted after an end time interval SIFS, the schedule frame indicating that the second STA and the first STA each transmit an acknowledgement frame on the first RU and the second RU.

Optionally, the sending module 1002 is further configured to: transmitting an NDPA frame on the operating channel, the NDPA frame indicating the second AP to transmit the first NDP to the first STA after an SIFS interval from the NDPA frame; the sending module 1002 is further configured to: transmitting a second NDP to the second STA after an interval SIFS from the NDPA frame; the sending module 1002 is further configured to: a scheduling frame is transmitted after an SIFS interval from the second NDP, the scheduling frame indicating that the second STA and the first STA transmit channel measurements on the first RU and the second RU, respectively.

Optionally, the STA association information further includes an uplink data amount to be transmitted of the first STA. As shown in fig. 11, the apparatus 100 further includes:

the processing module 1004 is configured to determine a first RU based on an uplink data amount to be transmitted of the second STA, and determine a second RU based on the uplink data amount to be transmitted of the first STA.

Optionally, the scheduling frame includes an AP information element and a plurality of user information elements, each user information element indicating allocation of an RU to one STA, the AP information element indicating an associated AP of the STA to which the user information element corresponds.

Optionally, the schedule frame includes a plurality of user information elements, each user information element including an indication of an RU allocated to one STA and an association indication indicating whether an AP transmitting the schedule frame is an associated AP of the STA to which the user information element corresponds.

In summary, in the data transmission device provided in the embodiment of the present application, the AP sends the scheduling frame on the working channel through the sending module. Because the scheduling frame comprises the RU of the associated STA of the AP and the RU of the associated STAs of other APs which are the same as the working channel of the AP, channel resources can be allocated to the associated STAs of a plurality of APs through the scheduling frame at the same time, so that the plurality of STAs can carry out uplink OFDMA transmission in a multi-AP scene, the application range of an uplink OFDMA technology is enlarged, and the resource utilization rate is also improved. In addition, the uplink frames are sent by the associated STAs of the plurality of APs through the scheduling frame sent by one AP, so that the channel resource consumption of the scheduling frame can be reduced.

Fig. 12 is a schematic structural diagram of yet another data transmission device according to an embodiment of the present application. The method is applied to the STA in the wireless local area network. As shown in fig. 12, the apparatus 120 includes:

a receiving module 1201 is configured to receive, on an operating channel of an STA, a scheduling frame sent by a non-associated AP, where the scheduling frame indicates to assign a first RU to a first STA and assign a second RU to a second STA, where the first STA is associated with the non-associated AP and the second STA is not associated with the non-associated AP.

A transmitting module 1202 is configured to transmit a frame to an associated AP of the STA on the RU based on the schedule frame when the schedule frame includes an indication of the RU allocated to the STA.

Optionally, as shown in fig. 13, the apparatus 120 further includes: a processing module 1203.

The processing module 1203 is configured to determine a target transmit power of the STA according to historical path loss information between the STA and an associated AP, where the historical path loss information is unrelated to power of the schedule frame. Accordingly, a transmitting module 1202 is configured to transmit a frame to an associated AP on the RU with a target transmit power.

In summary, in the data transmission device provided by the embodiment of the present application, the STA receives the scheduling frame sent by the non-associated AP on the working channel through the receiving module. Because the scheduling frame comprises the RU of the associated STA of the AP and the RU of the associated STAs of other APs which are the same as the working channel of the AP, channel resources can be allocated to the associated STAs of a plurality of APs through the scheduling frame at the same time, so that the plurality of STAs can carry out uplink OFDMA transmission in a multi-AP scene, the application range of an uplink OFDMA technology is enlarged, and the resource utilization rate is also improved. In addition, the uplink frames are sent by the associated STAs of the plurality of APs through the scheduling frame sent by one AP, so that the channel resource consumption of the scheduling frame can be reduced.

The specific manner in which the various modules perform the operations in the apparatus of the above embodiments have been described in detail in connection with the embodiments of the method, and will not be described in detail herein.

The embodiment of the application provides an AP, which comprises the following steps: a processor and a memory;

the processor is configured to invoke the computer program to implement the actions performed by the AP in the foregoing method embodiment.

The embodiment of the application provides an STA, which comprises the following steps: a processor and a memory;

the processor is configured to invoke the computer program to implement the actions executed by the STA in the method embodiment.

Fig. 14 is a block diagram of a data transmission apparatus according to an embodiment of the present application. The device may be a STA or an AP. As shown in fig. 14, the apparatus 140 includes: a processor 1401 and a memory 1402.

A memory 1402 for storing a computer program, the computer program comprising program instructions;

And the processor 1401 is configured to invoke the computer program to implement the actions performed by the AP or STA in the method embodiment.

Optionally, the device 140 further comprises a communication bus 1403 and a communication interface 1404.

Wherein the processor 1401 comprises one or more processing cores, the processor 1401 performs various functional applications and data processing by running computer programs.

Memory 1402 may be used to store a computer program. Optionally, the memory may store an operating system and at least one application unit required for functionality. The operating system may be a real-time operating system (Real Time eXecutive, RTX), LINUX, UNIX, WINDOWS, or an operating system such as OS X.

The communication interface 1404 may be multiple, and the communication interface 1404 is used to communicate with other devices. For example, in an embodiment of the present application, the communication interface of the AP may be used to send schedule frames to the STA.

The memory 1402 and the communication interface 1404 are connected to the processor 1401 via the communication bus 1403, respectively.

The embodiment of the application also provides a data transmission system, which comprises: a plurality of APs and a plurality of STAs, the operating channels of the plurality of APs being the same. The plurality of APs include a target AP including a data transmission apparatus as shown in fig. 10, 11 or 14. The STA includes a data transmission apparatus as shown in fig. 12, 13 or 14.

The embodiment of the application also provides a computer readable storage medium, wherein the computer readable storage medium stores instructions, and when the instructions are executed by a processor of computer equipment, the actions executed by the AP or the STA in the embodiment of the method are realized.

It will be understood by those skilled in the art that all or part of the steps for implementing the above embodiments may be implemented by hardware, or may be implemented by a program for instructing relevant hardware, where the program may be stored in a computer readable storage medium, and the storage medium may be a read-only memory, a magnetic disk or an optical disk, etc.

In embodiments of the present application, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

The term "and/or" in the present application is merely an association relation describing the association object, and indicates that three kinds of relations may exist, for example, a and/or B may indicate: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.

The foregoing description of the preferred embodiments of the present application is not intended to limit the application, but is intended to cover any modifications, equivalents, alternatives, and improvements within the spirit and principles of the application.

Claims

1. A data transmission method applied to a wireless local area network, the method comprising:

The method comprises the steps that a first Access Point (AP) acquires Station (STA) associated information of a second AP, the STA associated information comprises identification of an STA associated with the second AP, the STA associated with the second AP comprises a first STA, and the working channel of the second AP is the same as that of the first AP;

The first AP sends a scheduling frame on the working channel, wherein the scheduling frame indicates to allocate a first Resource Unit (RU) to a second STA and allocate a second RU to the first STA, and the second STA is associated with the first AP;

the first AP receives frames sent by the second STA based on the scheduling frames on a first RU;

If the first AP transmits a data frame to the second STA before the first AP transmits the schedule frame, wherein a start time of the first AP transmitting the data frame to the second STA is the same as a start time of the second AP transmitting the data frame to the first STA, and an end time of the first AP transmitting the data frame to the second STA is the same as an end time of the second AP transmitting the data frame to the first STA; the first AP transmits a scheduling frame on the working channel comprising: the first AP transmitting the schedule frame after a short interframe space SIFS from the end time interval, the schedule frame indicating that the second STA and the first STA each transmit an acknowledgement frame on the first RU and the second RU; or alternatively

If the first AP transmits a null data packet announce NDPA frame on the working channel before the first AP transmits the schedule frame, the NDPA frame instructs the second AP to transmit a first null data packet NDP to the first STA after an interval SIFS from the NDPA frame, the first AP transmits a second NDP to the second STA after an interval SIFS from the NDPA frame; the first AP transmits a scheduling frame comprising: the first AP transmits the schedule frame after an SIFS interval from the second NDP, the schedule frame indicating that the second STA and the first STA transmit channel measurements on the first RU and the second RU, respectively.

2. The method according to claim 1, wherein the method further comprises:

the first AP does not receive frames transmitted by the first STA based on the schedule frame on the second RU.

3. The method of claim 1 or 2, wherein the schedule frame indicates that the second STA and the first STA each transmit one of a data frame, an acknowledgement frame, and a channel measurement on the first RU and the second RU.

4. The method of claim 1 or 2, wherein the schedule frame includes an AP information element and a plurality of user information elements, each of the user information elements indicating an allocation RU to one STA, the AP information element indicating an associated AP of the STA to which the user information element corresponds.

5. The method according to claim 1 or 2, wherein the schedule frame comprises a plurality of user information elements, each of the user information elements comprising an indication of an RU allocated to one STA and an association indication indicating whether an AP transmitting the schedule frame is an associated AP of the STA to which the user information element corresponds.

6. The method of claim 1 or 2, wherein the second STA and the first STA satisfy a condition of non-interference with each other, and wherein the first RU overlaps with the second RU.

7. A data transmission method applied to a wireless local area network, the method comprising:

A Station (STA) receives a scheduling frame sent by a non-associated Access Point (AP) on a working channel of the STA, wherein the scheduling frame indicates to allocate a first Resource Unit (RU) to a first STA and allocate a second RU to a second STA, the first STA is associated with the non-associated AP, the second STA is not associated with the non-associated AP, and the associated AP of the STA is the same as the working channel of the non-associated AP;

When the schedule frame includes an indication of an RU allocated to the STA, the STA transmits a frame to an associated AP of the STA on the RU based on the schedule frame;

If the schedule frame is transmitted by the non-associated AP after a short interframe space SIFS from an end time of transmitting a data frame to the first STA, the schedule frame indicates that the first STA and the second STA each transmit acknowledgement frames on the first RU and the second RU, wherein a start time of transmitting the data frame by the non-associated AP to the first STA is the same as a start time of transmitting the data frame by an associated AP of the second STA to the second STA, and an end time of transmitting the data frame by the non-associated AP to the first STA is the same as an end time of transmitting the data frame by an associated AP of the second STA to the second STA; or alternatively

If the scheduling frame is transmitted by the non-associated AP after an interval SIFS after transmitting a first null data packet NDP to the first STA, the scheduling frame indicates that the first STA and the second STA transmit channel measurements on the first RU and the second RU, respectively, wherein a first NDP is transmitted by the non-associated AP after transmitting a null data packet announce NDPA frame on the working channel after an interval SIFS, the NDPA frame indicates that an associated AP of the second STA transmits a second NDP to the second STA after an interval SIFS with the NDPA frame.

8. The method of claim 7, wherein the schedule frame indicates that the first STA and the second STA each transmit one of a data frame, an acknowledgement frame, and a channel measurement on the first RU and the second RU.

9. The method of claim 7 or 8, wherein the STA receives the schedule frame sent by the unassociated AP on the STA's operating channel, the method further comprising:

The STA determines target transmitting power of the STA according to historical path loss information between the STA and the associated AP, wherein the historical path loss information is irrelevant to the power of the scheduling frame;

the STA transmitting a frame to the associated AP on the RU based on the schedule frame, comprising:

the STA transmits a frame to the associated AP on the RU using the target transmit power.

10. A data transmission apparatus for use in a first access point AP in a wireless local area network, the apparatus comprising:

the system comprises an acquisition module, a first access point and a second access point, wherein the acquisition module is used for acquiring Station (STA) association information of a second Access Point (AP), the STA association information comprises identification of an STA associated with the second Access Point (AP), the STA associated with the second access point comprises a first STA, and the working channel of the second access point is the same as that of the first Access Point (AP);

a sending module, configured to send a scheduling frame on the working channel, where the scheduling frame indicates to allocate a first resource unit RU to a second STA and allocate a second RU to the first STA, where the second STA is associated with the first AP;

a receiving module, configured to receive, on a first RU, a frame sent by the second STA based on the schedule frame;

The sending module is further configured to send a data frame to the second STA, where a start time of the first AP sending the data frame to the second STA is the same as a start time of the second AP sending the data frame to the first STA, and an end time of the first AP sending the data frame to the second STA is the same as an end time of the second AP sending the data frame to the first STA; and means for transmitting the schedule frame after a short interframe space, SIFS, from the end time interval, the schedule frame indicating that the second STA and the first STA each transmit an acknowledgement frame on the first RU and the second RU; or alternatively

The sending module is further configured to send a null data packet, announce, NDPA, frame on the working channel, where the NDPA frame indicates the second AP to send a first null data packet, NDP, to the first STA after an interval SIFS with the NDPA frame, and the first AP sends a second NDP to the second STA after an interval SIFS with the NDPA frame; and transmitting the schedule frame after an SIFS interval from the second NDP, the schedule frame indicating that the second STA and the first STA each transmit channel measurements on the first RU and the second RU.

11. The apparatus of claim 10, wherein the device comprises a plurality of sensors,

The receiving module is further configured to not receive, on the second RU, a frame sent by the first STA based on the schedule frame.

12. The apparatus of claim 10 or 11, wherein the schedule frame indicates that the second STA and the first STA each transmit one of a data frame, an acknowledgement frame, and a channel measurement on the first RU and the second RU.

13. The apparatus according to claim 10 or 11, wherein the schedule frame includes an AP information element and a plurality of user information elements, each of the user information elements indicating an allocation RU to one STA, the AP information element indicating an associated AP of the STA to which the user information element corresponds.

14. The apparatus according to claim 10 or 11, wherein the schedule frame includes a plurality of user information elements, each of the user information elements including an indication of an RU allocated to one STA and an association indication indicating whether an AP transmitting the schedule frame is an associated AP of the STA to which the user information element corresponds.

15. The apparatus of claim 10 or 11, wherein the second STA and the first STA satisfy a condition of non-interference with each other, and wherein the first RU overlaps with the second RU.

16. A data transmission apparatus for a station STA in a wireless local area network, the apparatus comprising:

A receiving module, configured to receive a scheduling frame sent by a non-associated access point AP on a working channel of the STA, where the scheduling frame indicates to allocate a first resource unit RU to a first STA and allocate a second RU to a second STA, where the first STA is associated with the non-associated AP, the second STA is not associated with the non-associated AP, and an associated AP of the STA is the same as the working channel of the non-associated AP;

A transmitting module, configured to, when the schedule frame includes an indication of an RU allocated to the STA, transmit a frame to an associated AP of the STA on the RU based on the schedule frame;

17. The apparatus of claim 16, wherein the schedule frame indicates that the first STA and the second STA each transmit one of a data frame, an acknowledgement frame, and a channel measurement on a first RU and the second RU.

18. The apparatus according to claim 16 or 17, characterized in that the apparatus further comprises:

A processing module, configured to determine a target transmit power of the STA according to historical path loss information between the STA and the associated AP, where the historical path loss information is unrelated to the power of the schedule frame;

And the sending module is used for sending frames to the associated AP on the RU by adopting the target transmitting power.

19. An access point AP, comprising: a processor and a memory;

The processor is configured to invoke the computer program to implement the data transmission method according to any of claims 1 to 6.

20. A station STA, comprising: a processor and a memory;

the processor is configured to invoke the computer program to implement the data transmission method according to any of claims 7 to 9.

21. A data transmission system, comprising: a plurality of access points APs and a plurality of stations STAs, the plurality of APs having the same operating channels, the plurality of APs including a target AP, the target AP including the data transmission apparatus according to any one of claims 10 to 15 or being the AP according to claim 19, the STA including the data transmission apparatus according to any one of claims 16 to 18 or being the STA according to claim 20.

22. A computer readable storage medium having instructions stored thereon which, when executed by a processor of a computer device, implement a data transmission method according to any of claims 1 to 9.