WO2022267599A1

WO2022267599A1 - Asymmetric transmission method and apparatus

Info

Publication number: WO2022267599A1
Application number: PCT/CN2022/084110
Authority: WO
Inventors: 郭永康; 王同波; 许浩维
Original assignee: 华为技术有限公司
Priority date: 2021-06-22
Filing date: 2022-03-30
Publication date: 2022-12-29
Also published as: CN115515233A

Abstract

The embodiments of the present application relate to the technical field of Wi-Fi. Disclosed are an asymmetric transmission method and apparatus, by means of which the problem of an AP being unable to receive an uplink data frame returned by an STA due to the transmitting power of the STA being less than the transmitting power of the AP when the STA and the AP transmit a data frame by using the same frequency is solved. The specific solution includes: an STA establishing a Wi-Fi connection with an AP; and the STA sending, to the AP, an uplink data frame on an uplink resource unit by means of the Wi-Fi connection, wherein the uplink resource unit comprises a first resource unit and a second resource unit, or the uplink resource unit comprises the second resource unit, the frequency of the second resource unit being lower than the frequency of the first resource unit, and the first resource unit being used by the AP to send a downlink data frame to the STA. The embodiments of the present application are applied to a process during which a data frame is transmitted between an STA and an AP by means of Wi-Fi.

Description

Asymmetric transmission method and device

This application claims the priority of a Chinese patent application filed with the State Intellectual Property Office on June 22, 2021, with application number 202110694917.6, and application title "An Asymmetric Transmission Method and Device", the entire contents of which are incorporated herein by reference. Applying.

technical field

The embodiments of the present application relate to the technical field of wireless local area networks, and in particular to an asymmetric transmission method and device.

Background technique

Wireless-fidelity (Wi-Fi) technology is a wireless local area network technology created by the Wi-Fi Alliance based on the Institute of Electrical and Electronics Engineers (Institute of Electrical and Electronic Engineers, IEEE) 802.11 standard. Wi-Fi technology generally involves two types of devices, an access point (access point, AP) and a station (station, STA). Among them, the AP can also be called a wireless access point, which is a provider of a Wi-Fi network, allows other wireless devices to access, and provides data access for the connected devices. A device connected to a Wi-Fi network may be called an STA. For example, electronic devices that support the Wi-Fi function, such as mobile phones, tablet computers, and notebook computers, can be used as STAs.

In Wi-Fi communication, the transmit power of the AP is greater than that of the STA. When the STA is far away from the AP, the STA can receive the data frames sent by the AP through the Wi-Fi connection, and then discover the AP. However, due to the low transmit power of the STA, the data frames sent by the STA through the Wi-Fi connection may not reach the AP. , so that the AP cannot receive the data frame sent by the STA, and the STA cannot access the AP or perform data frame transmission with the AP.

Contents of the invention

The embodiment of the present application provides an asymmetric transmission method and device, which solves the problem that the AP cannot receive the data frame sent by the STA because the transmission power of the STA is lower than that of the AP when the STA and the AP use the same frequency to transmit data frames.

In the first aspect, an embodiment of the present application provides an asymmetric transmission method, the method comprising: establishing a Wi-Fi connection between the STA and the AP; the STA sends an uplink data frame to the AP on an uplink resource unit through the Wi-Fi connection; wherein , the uplink data frame includes uplink service data, the uplink resource unit includes a first resource unit and a second resource unit, or the uplink resource unit includes a second resource unit; the frequency of the second resource unit is lower than the frequency of the first resource unit; the first The resource unit is used by the AP to send downlink data frames to the STA.

Based on the method described in the first aspect, reduce the signal strength attenuation from the STA to the AP by reducing the frequency used by the STA, increase the signal strength from the STA to the AP, increase the uplink transmission gain, and enhance the uplink Wi-Fi signal coverage performance, so that When the transmit power of the STA is low, the uplink data frame can still be transmitted to the AP to ensure that the AP receives the uplink data frame sent by the STA.

In a possible design, the first resource unit belongs to the first channel, and the second resource unit belongs to the second channel; wherein, the first channel and the second channel both belong to the first frequency band; or, the first channel belongs to the first frequency band, The second channel belongs to the second frequency band, and the frequency of the second frequency band is lower than the frequency of the first frequency band.

Based on this possible design, the second resource unit with a lower frequency than the first resource unit can be flexibly and efficiently designed.

In a possible design, the first frequency band includes a 6GHz frequency band, or a 5GHz frequency band, or a 2.4GHz frequency band; the second frequency band includes a 6GHz frequency band, or a 5GHz frequency band, or a 2.4GHz frequency band. Based on this possible design, the application scenarios and frequency bands of the method can be expanded.

In a possible design, before the STA sends an uplink data frame to the AP on the uplink resource unit through the Wi-Fi connection, the method further includes: the STA receives a first message from the AP for instructing the STA to perform asymmetric transmission. indication information; enabling the asymmetric transmission function of the STA according to the first indication information. Or, when the STA detects that when the STA transmits the uplink data frame on the first resource unit, one or more of the transmission indicators of the packet loss rate, the bit error rate, and the signal strength from the STA to the AP are not up to standard, the STA actively turns on the Symmetrical transfer function.

Based on this possible design, the STA can enable the asymmetric transmission function under the instruction of the AP, and the AP can centrally control the activation of the asymmetric transmission function, which simplifies the system design. Alternatively, the STA may actively enable its own asymmetric transmission function, reducing signaling interaction between devices caused by enabling the asymmetric transmission function, and reducing system design complexity.

In a possible design, the first indication information is also used to indicate the second resource unit; or, the first indication information is also used to indicate the uplink resource unit. Based on this possible design, the STA can learn the uplink resource units used for asymmetric transmission under the instruction of the AP, which simplifies the system design.

In a possible design, before the STA connects through Wi-Fi and sends the uplink data frame to the AP on the uplink resource unit, the method further includes: the STA connects through Wi-Fi and receives the frame from the AP on the first resource unit. The downlink data frame; wherein, the downlink data frame includes the first frame header, and the first frame header includes the channel number and the sub-channel sequence number; the STA sends the uplink data frame on the uplink resource unit through the Wi-Fi connection, including: STA according to When a STA receives a downlink data frame, it sends an uplink data frame on an uplink resource unit through a Wi-Fi connection; wherein, the uplink data frame includes a second frame header, and the second frame header includes the identification of the uplink resource unit, channel number, start The initial sequence number and Bitmap, the Bitmap includes a plurality of bits corresponding to a plurality of downlink data frames, and each bit is used to indicate whether the downlink data frame corresponding to the bit is successfully received by the STA.

Based on this possible design, the STA can feed back the correct transmission of the downlink data frame to the AP, so that the AP can adjust the downlink air interface rate and/or retransmit the downlink data frame according to the successful reception of the downlink data frame by the STA to ensure the downlink service Data transmission efficiency and transmission quality.

In a possible design, the uplink data frame includes uplink service data generated by the STA; the uplink data frame also includes a first frame header, and the first frame header includes a channel number and a sub-channel sequence number; when the STA is connected through Wi-Fi, the After sending the uplink data frame to the AP on the uplink resource unit, the method further includes: the STA receives a downlink data frame from the AP on the first resource unit; wherein, the downlink data frame includes a second frame header, and the second frame header includes The identifier of the first resource unit, the channel number, the starting sequence number, and the Bitmap. The Bitmap includes multiple bits corresponding to multiple uplink data frames, and each bit is used to indicate whether the uplink data frame corresponding to the bit is successfully received by the AP.

Based on this possible design, the AP can feed back the correct transmission of the uplink data frame to the STA, so that the STA can retransmit the uplink data frame according to the successful reception of the downlink data frame by the AP, ensuring the transmission efficiency and quality of the uplink service data .

In the second aspect, the embodiment of the present application provides an asymmetric transmission method, the method includes: the AP establishes a wireless fidelity Wi-Fi connection with the STA; through the Wi-Fi connection, the uplink data from the STA is received on the uplink resource unit Frame; wherein, the uplink resource unit includes the first resource unit and the second resource unit, or the uplink resource unit includes the second resource unit; the frequency of the second resource unit is lower than the frequency of the first resource unit; the first resource unit is used for the AP Send downlink data frame to STA.

Based on the method described in the second aspect, reduce the signal strength attenuation from the STA to the AP by reducing the frequency used by the STA, increase the signal strength from the STA to the AP, increase the uplink transmission gain, and enhance the uplink Wi-Fi signal coverage performance, so that When the transmit power of the STA is low, the uplink data frame can still be transmitted to the AP to ensure that the AP receives the uplink data frame sent by the STA.

Wherein, the related description of the first resource unit, the second resource unit, the first frequency band and the second frequency band can refer to the first aspect or the possible design of the first aspect, and will not be repeated here.

In a possible design, before the AP receives the uplink data frame from the STA on the uplink resource unit through the Wi-Fi connection, the method further includes: the AP connects to the STA through the Wi-Fi connection on the first resource unit Sending a downlink data frame; wherein, the downlink data frame includes a first frame header, and the first frame header includes a channel number and a subchannel sequence number; wherein, the uplink data frame includes a second frame header, and the second frame header includes an identification of an uplink resource unit , a channel number, a starting sequence number, and a bitmap Bitmap, the Bitmap includes multiple bits corresponding to multiple downlink data frames, and each bit is used to indicate whether the downlink data frame corresponding to the bit is successfully received by the STA.

The method further includes: the AP determines the cumulative packet loss rate of the downlink data frame according to the Bitmap; and adjusts the downlink air interface rate for sending the downlink data frame through the first resource unit according to the cumulative packet loss rate of the downlink data frame.

In a possible design, the uplink data frame includes uplink service data generated by the STA; the uplink data frame also includes a first frame header, and the first frame header includes a channel number and a subchannel sequence number; when the AP is connected through Wi-Fi, the After receiving the uplink data frame from the STA on the uplink resource unit, the method further includes: the AP sends the downlink data frame to the STA on the first resource unit; wherein the downlink data frame includes a second frame header, and the second frame header includes The identifier of the first resource unit, the channel number, the starting sequence number, and the Bitmap. The Bitmap includes multiple bits corresponding to multiple uplink data frames, and each bit is used to indicate whether the uplink data frame corresponding to the bit is successfully received by the AP.

In the third aspect, the embodiment of the present application provides an STA. The STA may include: a processor, a memory, and a communication interface, the memory and the communication interface are coupled to the processor, and the communication interface is used to communicate with other devices, and the other devices include an access point AP The memory is used to store computer program codes, the computer program codes include computer instructions, and when the processor executes the computer instructions, the STA executes the method described in the first aspect or any possible design of the first aspect.

In a fourth aspect, an embodiment of the present application provides an AP, including: a processor, a memory, and a communication interface; the memory and the communication interface are coupled to the processor; the processor can provide a Wi-Fi network through the communication interface; the memory is used to store computer programs Code, the computer program code includes computer instructions; when the processor executes the computer instructions, the access point device executes the method described in the second aspect or any possible design of the second aspect.

In the fifth aspect, the embodiment of the present application provides a computer-readable storage medium, including computer instructions. When the computer instructions are run on the STA, the STA executes the computer-readable storage medium as claimed in the first aspect or any possible design of the first aspect. described method.

In the sixth aspect, the embodiment of the present application provides a computer-readable storage medium, including computer instructions. When the computer instructions are run on the access point AP, the AP executes the second aspect or any possible design of the second aspect. described method.

In the seventh aspect, the embodiment of the present application provides a computer program product. In a possible design, when the computer program product is run on a computer, the computer is made to execute the first aspect or any possible design of the first aspect or the first aspect. The method described in the second aspect or any possible design of the second aspect.

In the eighth aspect, the embodiment of the present application provides an asymmetric transmission system, including an AP and an STA, and the AP and the STA are used to implement any possible design of the first aspect or the first aspect, or the second aspect or the second aspect Any possible design of the described method.

Description of drawings

FIG. 1 is a schematic diagram of a data frame interaction process between an AP and an STA;

FIG. 2 is a simplified schematic diagram of a system architecture provided by an embodiment of the present application;

FIG. 3 is a schematic composition diagram of an electronic device 300 provided in an embodiment of the present application;

FIG. 4a is a schematic diagram of the composition of a protocol layer provided by an embodiment of the present application;

FIG. 4b is a schematic diagram of the composition of a protocol layer provided by the embodiment of the present application;

FIG. 5a is a flow chart of an asymmetric transmission method provided by an embodiment of the present application;

FIG. 5b is a flow chart of an asymmetric transmission method provided by an embodiment of the present application;

Figures 6a-6c are schematic diagrams of asymmetric transmission provided by the embodiment of the present application;

7a-7c are schematic diagrams of asymmetric transmission provided by the embodiment of the present application;

Fig. 8a is a flow chart of processing data frames provided by the embodiment of the present application;

Fig. 8b is a flow chart of processing data frames provided by the embodiment of the present application;

Fig. 9a is a schematic diagram of the frame format of the data frame provided by the embodiment of the present application;

FIG. 9b is a schematic diagram of the frame format of the data frame provided by the embodiment of the present application;

FIG. 10 is a schematic structural diagram of a communication device provided by an embodiment of the present application.

detailed description

Wi-Fi technology is a wireless local area network (wireless local area network, WLAN) technology created in the 802.11 standard. Wi-Fi technology can be used to connect network devices wirelessly. Wi-Fi technology has the advantages of wide coverage, fast speed, low cost, no need for wiring, and convenient installation. The working frequency bands corresponding to the Wi-Fi technology include 2.4 gigahertz (G-Hertz, GHz), 5 GHz, and 6 GHz. Devices using Wi-Fi technology (such as APs, STAs, etc.) can simultaneously use one or more frequency bands of 2.4GHz, 5GHz, and 6GHz for wireless communication. Wireless communication may include transmitting Wi-Fi frames (or called Wi-Fi packets, data frames, or data packets, etc.).

It should be noted that the 2.4 GHz, 5 GHz and 6 GHz described in the embodiment of the present application are only exemplary illustrations. With the development of Wi-Fi technology, new frequency bands that appear later are also within the scope of protection of the embodiments of the present application. Inside.

In the embodiment of the present application, a frequency band is a frequency range (frequency rang) obtained by dividing radio waves (or called electromagnetic wave frequency bands or spectrum resources), and has a certain frequency bandwidth. A frequency range corresponding to a frequency band may be divided into multiple small frequency bands or frequency ranges, and each small frequency band or frequency range may be called a channel (channel) (or sub-channel (sub-channel)). For example, the frequency range of 5 GHz may be divided into 45 channels, and the frequency range of 2.4 GHz may be divided into 14 channels. A channel can include one or more resource units (resource unit, RU). RU is a kind of channel obtained by dividing a channel with a certain bandwidth by using orthogonal frequency-division multiple access (OFDMA) technology. Frequency domain resource form. RU can include one or more sub-carriers, such as RU can be 26-tone RU, 52-tone RU, 106-tone RU, 242-tone RU, 484-tone RU, 996-tone, 2x996-tone Wait. Among them, tone represents a subcarrier, and A in A-tone represents the number of subcarriers. For example, 26-tone RU means that the RU includes 26 subcarriers.

It should be understood that in this embodiment of the present application, using a certain frequency band for wireless communication may refer to: performing wireless communication on the RU included in the channel in the frequency band. As mentioned above, the RU may include one or more sub- carrier. Or using a certain frequency band for wireless communication may refer to performing wireless communication on one or more channels in the frequency band; or using a certain frequency band for wireless communication may refer to performing wireless communication on one or more carriers in the frequency band. Communication, or using a certain frequency band for wireless communication can refer to wireless communication at a certain frequency point (or center frequency point) in the frequency band, or using a certain frequency band for wireless communication can refer to a certain frequency in the frequency band (or center frequency) for wireless communication, etc.

In a possible design, in Wi-Fi communication, the AP and STA that establish the WI-FI connection communicate with each other on the same frequency, such as completing the transmission, confirmation and retransmission of Wi-Fi frames on the same frequency, so as to Simplify the complexity of Wi-Fi frame transmission in Wi-Fi communication. Take the AP and STA working on channel 1 of 2.4GHz at the same time as an example, the AP can send Wi-Fi frames (which can be called downlink data frames) to the STA on channel 1 of the 2.4GHz frequency band, and the STA receives the Wi-Fi frame from the AP. After the frame, similarly, the STA can send an acknowledgment (acknowledgment, ACK) frame (which can be called an uplink data frame) corresponding to the Wi-Fi frame to the AP on channel 1 of the 2.4GHz frequency band, so that the AP Determine whether to retransmit Wi-Fi frames to the STA, etc. Specifically, this process may refer to what is shown in FIG. 1 .

Referring to Fig. 1, a complete Wi-Fi frame transmission process between AP and STA to establish a WI-FI connection, as shown in Fig. 1, the process can be in the following three stages: (1) setup (setup) stage, The AP (or the originator) can send a block acknowledgment request (add block acknowledgment request, ADDBA request) to the STA (or the recipient), and the STA receives the ADDBA request and returns an acknowledgment message to the AP ( acknowledgment, ACK). The STA sends an ADDBA request to the AP, and the AP receives the ADDBA request and sends an ACK to the STA. So far, the two negotiate to complete the block ack agreement. (2) During the data (data) & block ack (block ack) phase, the AP can send a medium access control (media access control, MAC) layer protocol message unit (MAC protocol data unit, MPDU) to the STA on channel 1 of 2.4GHz ), the MPDU may include the Wi-Fi frame sent by the AP to the STA. STA receives the MPDU, after receiving the block ack request (block ack request, BAR) frame from the AP, the STA can return the block acknowledgment (block ack, BA) frame for the MPDU to the AP on channel 1 of 2.4GHz, and the BA frame can Include ACK frames. (3) During the tear down phase, after the Wi-Fi frame transmission is completed, the AP can send a delete block acknowledgment (DELBA request) to the STA, and the STA returns an ACK to the AP, thus canceling an established block ack agreement.

In this embodiment of the application, downlink data frames and uplink data frames are relative concepts. The data frames and Wi-Fi frames sent by the AP to the STA can be collectively referred to as downlink data frames, and the data frames and ACK frames sent by the STA to the AP can be collectively referred to as It is an uplink data frame and is not limited. Wherein, the Wi-Fi frame may include but not limited to a data (data) frame, a control (control) frame, a management (management) frame and an extension (extension) frame. The control frame includes but is not limited to a request to send (ready to send, RTS) frame, a clear to send (clear to send, CTS) frame, and an ACK frame. The management frame may include but not limited to a probe request (probe request) frame, a probe response (probe response) frame, a beacon (beacon) frame, and the like.

It can be seen from the above that the downlink data frame and the uplink data frame are transmitted between the AP and the STA on the same frequency. Since most STAs are low-power devices such as smart phones and smart home appliances, STAs are limited by their own power consumption and antenna efficiency. Under the same frequency, the transmit power of STAs is lower than that of APs. In this embodiment of the present application, the transmission power can also be replaced by signal strength. For example, the transmission power of a STA can be described as the signal strength from the STA to the AP, and the transmission power of the AP can be described as the signal strength from the AP to the STA. The transmit power may be in units of milliwatts (mW), and the unit of signal strength may be in decibels of milliwatts (dBm), 1dBm=10*lg(1mW), where the symbol "*" means multiplication calculation.

For example, assuming that the STA is a mobile phone, both the STA and the AP work on channel 1 of 2.4GHz. Table 1 below shows the signal strength from different types of mobile phones to the AP at a certain distance, and the signal strength from the AP that provides the Wi-Fi network to the mobile phone. The signal strength of the phone. As shown in Table 1, for any type of mobile phone, the signal strength from the AP to the STA is greater than the signal strength from the mobile phone to the AP. For example, taking mobile phone A as an example, the signal strength from AP to mobile phone A is -57dBm, and the signal strength from mobile phone A to AP is -76dBm, and the signal strength difference between the two is 19dBm. For another example, taking mobile phone B as an example, the signal strength from AP to mobile phone B is -56dBm, and the signal strength from mobile phone B to AP is -65dBm, and the signal strength difference between the two is 9dBm.

Table I

It should be noted that Table 1 is only an exemplary table, and the embodiment of the present application does not limit the models and quantities of mobile phones shown in Table 1. In addition to the mobile phones shown in Table 1, other types of mobile phones or other types of STA devices may also be included.

Since the working frequency is directly proportional to the free space loss, the higher the working frequency, the greater the free space loss and the greater the signal strength attenuation caused by communication at this working frequency; correspondingly, the lower the working frequency, the greater the The lower the free space loss caused by communication over the network, the smaller the signal strength attenuation. Therefore, when the AP and STA work at the same frequency, the free space loss and signal attenuation strength of the two are basically the same. Since the transmit power of the AP is greater than the transmit power of the STA, when the free space loss and signal attenuation strength of the two are basically the same, the signal strength of the downlink data frame sent by the AP to the STA is higher than that of the uplink data frame sent by the STA to the AP. The signal strength of the frame, which may have the following problems: the STA can receive the downlink data frame sent by the AP and find the AP, but because the STA’s transmit power is low, the AP cannot receive the uplink data frame sent by the STA, resulting in the uplink data frame Frame transmission fails, affecting the Wi-Fi communication between the STA and the AP. For example, the AP sends a Wi-Fi frame to the STA on channel 1. After receiving the Wi-Fi frame from channel 1, the STA returns an ACK frame for the Wi-Fi frame on channel 1. However, due to the low transmit power of the STA, , causing the ACK frame to fail to reach the AP.

In order to solve the problem that the AP cannot receive the uplink data frame sent by the STA because the transmit power of the STA is lower than the transmit power of the AP, in a possible design, the transmit power of the STA or the receive sensitivity index is enhanced by improving the hardware device to achieve The purpose of increasing the transmit power of the STA. For example, the antenna gain of the STA can be increased by increasing the transmission power of the Wi-Fi chip in the STA, or using a power amplifier (power amplifier, PA)/low noise amplifier (low noise amplifier, LNA), a wireless radio frequency front-end module (RF frontend module, FEM) and other devices to improve the transmit power and sensitivity indicators of the STA. However, this method of increasing the transmission power of STAs by improving hardware devices is not only limited by the technical specifications that hardware devices can achieve, but also limited by hardware device costs, equipment size and/or power consumption limitations, etc., and is generally poor in applicability.

In view of this, an embodiment of the present application provides an asymmetric transmission method, which may include: establishing a Wi-Fi connection between the STA and the AP, and the STA sends an uplink data frame including uplink data to the AP on an uplink resource unit through the Wi-Fi connection . The uplink resource unit includes the first resource unit and the second resource unit, or includes the second resource unit, wherein the frequency of the second resource unit is lower than the frequency of the first resource unit, and the first resource unit is used for the AP to send the downlink data frame to the STA , that is, in Wi-Fi communication, downlink data frames are sent on a higher frequency, and uplink data frames are sent on a lower frequency. In this way, using the characteristic that the frequency is proportional to the free space loss, by reducing the frequency used by the STA to reduce the signal strength attenuation from the STA to the AP, increase the signal strength from the STA to the AP, improve the uplink transmission gain, and enhance the uplink Wi- The Fi signal coverage performance enables the STA to transmit uplink data frames to the AP even when the transmit power is low, ensuring that the AP receives the uplink data frames sent by the STA.

In this embodiment of the application, the first resource unit and the second resource unit belong to the same channel, and are resource units with different frequencies in the same channel; or, the first resource unit and the second resource unit belong to different channels, for example, the first resource unit belongs to For the first channel, the second resource unit belongs to the second channel.

Wherein, the first channel and the second channel both belong to the first frequency band, for example, different channels belonging to the first frequency band; or, the first channel and the second channel belong to different frequency bands, for example, the first channel belongs to the first frequency band, and the second channel belongs to The second frequency band, the frequency of the second frequency band is lower than the frequency of the first frequency band. In the embodiment of the present application, the first frequency band may include a 6GHz frequency band, or a 5GHz frequency band, or a 2.4GHz frequency band; the second frequency band may include a 6GHz frequency band, or a 5GHz frequency band, or a 2.4GHz frequency band.

In one example, the first resource unit belongs to the first frequency band, the second resource unit belongs to the second frequency band, the first frequency band may be the 6GHz frequency band, and the second frequency band may be the 5GHz frequency band or the 2.4GHz frequency band; or the first frequency band is the 6GHz frequency band , the second frequency band is the 5GHz frequency band and the 2.4GHz frequency band; or the first frequency band is the 5GHz frequency band, and the second frequency band is the 2.4GHz frequency band.

In another example, the first resource unit and the second resource unit belong to the same frequency band, but the first resource unit and the second resource unit belong to different channels of the frequency band, for example, the first resource unit corresponds to the first channel, and the second resource unit Corresponding to one or more second channels, the frequency of the second channel is lower than the frequency of the first channel. For example, the first resource unit and the second resource unit may respectively correspond to channel 1 and channel 2 in the 6GHz frequency band, 5GHz frequency band, or 2.4GHz frequency band, and the frequency of channel 2 is lower than that of channel 1. It should be understood that the frequency of the channel described in this embodiment of the present application may be referred to as the center frequency of the channel.

In another example, the first resource unit and the second resource unit are different resource units of the same channel, for example, the channel includes 26-tone RU, the first resource unit may be the last 13 subcarriers in the 26-tone RU, and The second resource unit may be the first 13 subcarriers in the 26-tone RU, and the frequency of the first 13 subcarriers is lower than the frequency of the last 13 subcarriers. Another example is that the channel includes two 26-tone RUs, the first resource unit can be the second 26-tone RU, and the second resource unit can be the first 26-tone RU, the frequency of the first 26-tone RU is low at the frequency of the second 26-tone RU.

The following describes the asymmetric transmission method provided by the embodiment of the present application with reference to the drawings in the specification.

Referring to FIG. 2 , it shows a schematic diagram of a Wi-Fi network architecture provided by the present application. As shown in FIG. 2 , the Wi-Fi network may include: multiple STA100 and AP200. STA100 can establish a Wi-Fi connection with AP200, and AP200 can provide STA100 with a Wi-Fi network. Each network element in Figure 2 is described below:

Among them, STA100 can be a device with Wi-Fi access function, for example, it can be a mobile phone (or called a smart phone), a smart home device (such as a smart TV, a smart refrigerator, a smart washing machine, a smart rice cooker, a smart light bulb, etc.), a portable Computer, personal computer (Personal Computer, PC), wearable electronic device, tablet computer, cellular phone, personal digital assistant (personal digital assistant, PDA), augmented reality (augmented reality, AR) \ virtual reality (virtual reality, VR) devices and other Wi-Fi-enabled devices.

Among them, the AP200 can be called a wireless access point, which is a provider of a Wi-Fi network, allows other wireless devices to access, and provides data access for the connected devices. An AP can be a router. The AP may also be an electronic device with AP capabilities (for example, capable of providing a Wi-Fi network), such as a mobile phone, that is, an electronic device with AP capabilities may serve as an AP.

It should be noted that FIG. 2 is only an exemplary drawing, and the number of nodes included in FIG. 2 is not limited, and in addition to the functional nodes shown in FIG. 2, the communication system may also include other nodes, such as application servers, etc. No restrictions.

Wherein, each network element shown in FIG. 2 , such as STA100 and AP200 may adopt the composition structure shown in FIG. 3 or include components shown in FIG. 3 . FIG. 3 is a schematic diagram of the composition of an electronic device 300 provided by the embodiment of the present application. If the electronic device 300 has the function of the STA100 described in the embodiment of the present application, the electronic device 300 can be STA100 or a chip or a chip in the STA100 system. When the electronic device 300 has the functions of the AP200 (such as the first AP200 or the second AP200) described in the embodiment of the present application, the electronic device 300 may be the AP200 or a chip or a chip system in the AP200.

As shown in FIG. 3 , the communication device 300 may include a processor 301 , a communication line 302 and a Wi-Fi communication module 303 . Optionally, the communication device 300 may further include a memory 304 . Wherein, the processor 301 , the memory 304 and the Wi-Fi communication module 303 may be connected through a communication line 302 .

Wherein, the processor 301 may be a central processing unit (central processing unit, CPU), a general-purpose processor, a network processor (network processor, NP), a digital signal processor (digital signal processing, DSP), a microprocessor, a microcontroller , programmable logic device (programmable logic device, PLD) or any combination thereof. The processor 301 may also be other devices with processing functions, such as circuits, devices, or software modules. It can be used to convert wireless signal into Wi-Fi signal, and provide program code of Wi-Fi network for STA100 etc.

The communication line 302 is used to transmit information between the components included in the communication device 300 .

The Wi-Fi communication module 303 is configured to communicate with other devices or other communication networks. The other communication network may be an Ethernet, a radio access network (radio access network, RAN), a wireless local area network (wireless local area networks, WLAN), and the like. The Wi-Fi communication module 303 can be a radio frequency module or any device capable of realizing communication. The Wi-Fi communication module 303 can support one or more frequency bands, such as one or more of the 6GHz frequency band, 5GHz frequency band or 2.4GHz frequency band. kind of frequency band. In this embodiment of the present application, the Wi-Fi communication module 303 is used as an example of a radio frequency module for illustration. The radio frequency module may include an antenna, a radio frequency circuit, etc., and the radio frequency circuit may include a radio frequency integrated chip, a power amplifier, and the like. The Wi-Fi communication module 303 receives electromagnetic waves via the antenna, frequency-modulates and filters the electromagnetic wave signals, and sends the processed signals to the processor 301 . The Wi-Fi communication module 303 also receives the signal to be sent from the processor 301, modulates its frequency, amplifies it, and converts it into electromagnetic waves for radiation through the antenna.

The memory 304 is used for storing instructions. Wherein, the instruction may be a computer program.

Wherein, the memory 304 can be a read-only memory (read-only memory, ROM) or other types of static storage devices that can store static information and/or instructions, and can also be a random access memory (random access memory, RAM) or Other types of dynamic storage devices that store information and/or instructions can also be electrically erasable programmable read-only memory (EEPROM), compact disc read-only memory (CD- ROM) or other optical disc storage, optical disc storage, magnetic disk storage media, or other magnetic storage devices, including compact discs, laser discs, compact discs, digital versatile discs, Blu-ray discs, etc.

It should be noted that the memory 304 may exist independently of the processor 301 or may be integrated with the processor 301 . The memory 304 can be used to store instructions or program codes or some data and so on. The memory 304 may be located in the communication device 300 or outside the communication device 300, without limitation. The processor 301 is configured to execute instructions stored in the memory 304, so as to implement the asymmetric transmission method provided by the following embodiments of the present application.

In an example, the processor 301 may include one or more CPUs, such as CPU0 and CPU1 in FIG. 3 .

As an optional implementation manner, the communications apparatus 300 includes multiple processors, for example, in addition to the processor 301 in FIG. 3 , it may further include a processor 307 .

As an optional implementation manner, the communication apparatus 300 further includes an output device 305 and an input device 306 . Exemplarily, the input device 306 is a device such as a keyboard, a mouse, a microphone, or a joystick, and the output device 305 is a device such as a display screen and a speaker (speaker).

It should be noted that the communication device 300 may be a desktop computer, a portable computer, a mobile phone, a tablet computer, a wireless user equipment, an embedded device, a chip system or a device having a structure similar to that shown in FIG. 3 . In addition, the composition structure shown in FIG. 3 does not constitute a limitation to the communication device. In addition to the components shown in FIG. 3, the communication device may include more or less components than those shown in the illustration, or combine certain components , or different component arrangements. In the embodiment of the present application, the system-on-a-chip may be composed of chips, or may include chips and other discrete devices.

In order to complete the asymmetric transmission process described in the embodiment of the present application, the above-mentioned STA100 and AP200 may include a protocol layer (protocol layer) as shown in FIG. 4a or FIG. 4b. As shown in FIG. 4a, it may include an application layer, a presentation layer, a session layer, a transport layer, a network layer, an asymmetric transport layer, an 802.11 data link layer, and an 802.11 physical layer. The presentation layer and the session layer in FIG. 4a can be integrated in the application layer, and at this time, the application layer can integrate functions of the presentation layer and the session layer. Fig. 4b is a schematic diagram of the protocol layer after the application layer, the presentation layer and the session layer are integrated. As shown in FIG. 4b, it may include an application layer, a transport layer, a network layer, an asymmetric transport layer, an 802.11 data link layer, and an 802.11 physical layer. Among them, the asymmetric transport layer, 802.11 data link layer, and 802.11 physical layer in Figure 4a or Figure 4b can be called the bottom layer, unless the symmetrical transport layer, 802.11 data link layer, and other protocol layers other than the 802.11 physical layer can be called is the upper layer, for example, the application layer, presentation layer, session layer, transport layer, and network layer in FIG. 4a can all be referred to as the upper layer.

Among them, the asymmetric transport layer in the protocol layer in Figure 4a or Figure 4b is a newly added protocol layer provided by the embodiment of the present application, unless the functions of other protocol layers other than the symmetrical transport layer are not enhanced, which is different from that specified in the existing standard have the same function. The functions of each protocol layer are described below:

The application layer is the highest layer of the open system interconnect (OSI) reference model, which is the interface between computer users and various applications and networks. The main functions of the application layer include: directly providing services to users, completing various tasks that users want to complete on the network, responsible for completing the connection between applications in the network and the network operating system, and establishing and ending the connection between users , and complete various protocols such as supervision, management and services required by various network services and applications proposed by network users.

Presentation layer: presentation, security, and compression of data. Responsible for data encoding and conversion to ensure that the data in the application layer can work normally. This layer is the place where the interface and binary code are converted to each other. At the same time, this layer is responsible for data compression, decompression, encryption, decryption, etc. This layer can also be based on Different application purposes process data into different formats, which are manifested in various file extensions.

Session layer (session layer): establish, manage, and terminate sessions. The session layer is mainly responsible for establishing, maintaining, and controlling sessions between two nodes in the network, distinguishing between different sessions, and providing three communication modes of simplex, half-duplex, and full-duplex services. The network file system (network file system, NFS), remote procedure call (remote procedure call, RPC) and X Window all work in this layer.

Transport layer (transport layer): defines the protocol port number for transmitting data, as well as flow control and error checking. Mainly responsible for splitting and combining data to realize end-to-end logical connection. The data in the upper three layers is a whole, and it starts to be divided at this layer. The data after this layer is called a segment. Three-way handshake, connection-oriented or non-connection-oriented services, flow control, etc. are all implemented in this layer. One service working at the transport layer is the transmission control protocol (transmission control protocol, TCP) in the transmission control protocol/internet protocol (transmission control protocol/internet protocol, TCP/IP) protocol suite, and another transport layer service is the Internet The sequenced packet exchange protocol (SPX) of the Internet work packet exchange (IPX/SPX) protocol suite. The transport layer provides an end-to-end connection, and the connection is distinguished by the port number.

Network layer (network layer): perform logical address addressing, realize path selection between different networks, etc. The role of the network layer is to translate network addresses into physical addresses and decide how to route data from the sender to the receiver. It is mainly responsible for managing network addresses, locating devices, and determining routes. Routers work at this layer. The data of the upper layer is divided at this layer, and after encapsulation, it is called a packet. There are two main types, one is the user data packet, which is the user data passed down from the upper layer, and the other is called the routing update packet, which is sent directly by the router. It is used to exchange routing information with other routers. Common network layer protocols include Internet Protocol (internet protocol, IP), routing information protocol (routing information protocol, RIP), open shortest path first (open shortest path first, OSPF) and so on.

Asymmetric transmission layer: It can be used to realize functions such as AP and STA transmitting data frames on asymmetric frequencies, maintaining the order of data frames, and adjusting the downlink air interface rate. For example, the asymmetric transmission layer in the STA may enable the STA to return the uplink data frame corresponding to the downlink data frame transmitted by the AP on the first resource unit to the AP on the second resource unit. The uplink data frame may be an ACK frame for the downlink data frame or the like. The asymmetric transmission layer in the AP can enable the AP to receive and parse the uplink data frame corresponding to the downlink data frame transmitted on the first resource unit on the second resource unit, and then determine according to the bitmap (Bitmap) included in the uplink data frame For the correct transmission of downlink data frames, calculate the cumulative packet loss rate of downlink data frames, and adjust the downlink air interface rate according to the cumulative packet loss rate of downlink data frames.

It should be noted that the embodiment of this application does not limit the name of the asymmetric transport layer, and the protocol layer can also be named by other names. In addition, this application does not limit the deployment location of the asymmetric transport layer. The asymmetric transport layer can be as shown in the figure The independent deployment shown in Figure 4a or Figure 4b can also be integrated in other protocol layers, such as the 802.11 data link layer, etc., without limitation.

802.11 data link layer (data link layer): establish logical connections, perform hardware address addressing, error checking, etc. Control the communication between the 802.11 physical layer and the network layer, mainly responsible for the preparation of physical transmission, including physical address addressing, cyclic redundancy check code (cyclic redundancy check, CRC) check, error notification, network topology, flow control and Resend etc. Both the media access control (MAC) address and the switch work with this layer. The packets passed down from the upper layer are divided and encapsulated at this layer and called frames. The common 802.11 data link layer protocol has synchronous data link control (synchronous data link control, SDLC), spanning tree protocol (spanning tree protocol, STP), advanced data link control protocol (high level data link control, HDLC), intercepting data packets on the network according to the user's definition Packet analysis tools (such as tcpdump), etc.

802.11 physical layer (physical layer): establish, maintain, disconnect physical connections, etc., responsible for finally encoding information into current pulses or other signals for online transmission, etc. 802.11 physical layer and 802.11 link layer are matched, and the HUB hub is work at the physical layer. The 802.11 physical layer is a real physical link, which specifies the mechanical characteristics, electrical characteristics, functional characteristics and process characteristics between the activation, maintenance and shutdown communication endpoints. It provides a physical medium for transmitting data for the upper layer protocol and is responsible for Send and receive data as a bit stream.

For ease of understanding, in combination with the system shown in FIG. 2 , the STA is the STA100 shown in FIG. 2 , and the AP is the AP200 shown in FIG. 2 as an example, and an asymmetric transmission method provided by the embodiment of the present application is specifically introduced.

Referring to FIG. 5a or FIG. 5b , it is a schematic diagram of an asymmetric transmission method provided by the embodiment of the present application. The method can enhance the signal strength from the STA to the AP, and ensure that the uplink data frame sent by the STA reaches the AP. As shown in Figure 5a or Figure 5b, the method may include:

S501: The user triggers the STA100 to access the AP200, establishes a Wi-Fi connection with the AP200, and the AP200 provides the STA100 with a Wi-Fi network.

Wherein, STA100 may be an STA with asymmetric transmission capability in FIG. 2 . AP 200 may be an AP capable of asymmetric transmission in FIG. 2 .

For example, the user turns on the Wi-Fi function of STA100, which triggers STA100 to first discover AP200 through active scanning/passive scanning, and then establish a Wi-Fi connection with AP200 after two processes of authentication and association. This process can refer to the prior art.

For example, after the AP 200 is turned on and configured, it may broadcast a beacon (Beacon) frame on a certain frequency (such as the frequency corresponding to the first resource unit), and the Beacon frame may indicate that the AP 200 can provide a Wi-Fi network. After the STA100 is turned on, it can be set to search for the Beacon frames broadcast by the AP on which frequencies around it, find available Wi-Fi networks, and present the available Wi-Fi networks to the user for the user to choose the Wi-Fi network that the STA100 wants to access. Fi network. If the user selects the Wi-Fi network provided by the AP200, the user enters the authentication information of the AP200 in the STA100 (that is, the Wi-Fi network service set identifier (service set identifier, SSID) and access password provided by the AP200), and then passes through the AP200 After authentication, STA100 sends an association request (association request) frame to AP200, requesting access to AP200, AP200 receives the association request frame, and replies an association response to STA100, so far STA100 establishes a connection (or called a Wi-Fi connection) with AP200, such as STA100 Establish a Wi-Fi connection with the AP 200 on the first resource unit.

Further, after the AP200 establishes a Wi-Fi connection with the STA100, the two transmit uplink data frames and/or downlink data frames on the frequency of the Wi-Fi network provided by the AP200. Taking the first resource unit corresponding to the frequency of the Wi-Fi network provided by AP200 as an example, AP200 and STA100 can transmit uplink data frames and/or downlink data frames on the first resource unit, such as the Wi-Fi transmission corresponding to the first resource unit Uplink data frames and/or downlink data frames are transmitted on the channel. It should be noted that the "transmission" mentioned in the embodiment of the present application may include "receiving and/or sending".

Optionally, in the process of establishing a connection between STA100 and AP200, AP200 can also broadcast information about whether it has asymmetric transmission capability, for example, it can carry information indicating whether AP200 has asymmetric transmission capability in the Beacon frame, In order for the STA100 to know whether the AP200 has the asymmetric transmission capability. Optionally, if AP200 has asymmetric transmission capability, the Beacon frame can also carry the frequency that can be used by AP200 to send downlink data frames in asymmetric transmission mode, for example, it can carry the frequency that can be used by AP200 to send downlink data frames in asymmetric transmission mode Resource unit (or called resource unit range). In the embodiment of the present application, the resource units available for the AP 200 to send the downlink data frame in the asymmetric transmission mode may include the first resource unit.

Optionally, in the process of establishing a connection between STA100 and AP200, STA100 can also indicate to AP200 whether it has asymmetric transmission capability, for example, it can carry the information of whether STA100 has asymmetric transmission capability in the association request frame, so that The AP 200 learns whether the STA 100 has the asymmetric transmission capability. If the STA100 has the asymmetric transmission capability, the association request frame may also carry the frequency available for the STA100 to send the uplink data frame in the asymmetric transmission mode, for example, it may carry the resource unit ( or resource unit scope). In this embodiment of the present application, the resource units available for the STA 100 to send the uplink data frame in the asymmetric transmission mode may include the second resource unit.

S502: The AP 200 determines whether the STA 100 satisfies a preset condition when the STA 100 sends an uplink data frame on the first resource unit. If the preset condition is met, the AP 200 sends the first indication information to the STA 100 , instructing the STA 100 to perform asymmetric transmission or enable an asymmetric transmission function. Further, the first indication information may also indicate the uplink resource unit used by the STA100 to send the uplink data frame. On the contrary, if the STA100 does not satisfy the preset condition, it does not perform asymmetric transmission, and keeps transmitting the uplink data frame and/or the downlink data frame on the first resource unit.

It should be understood that the embodiment of the present application is not limited to adopting the method described in S502. The AP 200 notifies the STA100 to enable the asymmetric transmission function. Other methods may also be used to enable the asymmetric transmission function. For example, the following method 1 or method 2 may be used to trigger the STA100 to enable Asymmetric transfer function:

Manner 1: STA100 determines whether a preset condition is met when sending an uplink data frame on the first resource unit, and if the preset condition is met, STA100 starts its own asymmetric transmission function autonomously. On the contrary, if the STA100 determines that the preset condition is not met, the asymmetric transmission will not be performed, and the uplink data frame and/or the downlink data frame will be transmitted on the first resource unit.

Further, STA100 independently enables its own asymmetric transmission function, and STA100 can also indicate to AP200 that STA100 has enabled the asymmetric transmission function, so that AP200 knows that STA100 has enabled the asymmetric transmission function, and AP200 determines the uplink resources used to transmit uplink data frames unit, and indicate the determined uplink resource unit to the STA100.

Method 2: STA100 determines whether the preset condition is met when sending the uplink data frame on the first resource unit. If the preset condition is met, STA100 determines that the asymmetric transmission function needs to be enabled. At this time, STA100 sends a request message to AP200, requesting Enable the asymmetric transmission function. Correspondingly, after receiving the request message sent by the STA100, if the AP200 accepts the request of the STA100 and agrees to enable the asymmetric transmission function, the AP200 sends the first indication information to the STA100. Instruct STA100 to perform asymmetric transmission or enable the asymmetric transmission function.

In this embodiment of the present application, asymmetric transmission may refer to the frequency (or uplink resource unit) used by the STA100 to send the uplink data frame. For example, AP200 sends downlink data frames on the first resource unit, STA100 sends uplink data frames on the second resource unit, or sends uplink data frames on the first resource unit and the second resource unit, and the frequency of the second resource unit is lower than The frequency of the first resource unit.

Wherein, the preset condition may be used to judge the execution of the asymmetric transmission. The preset condition can be used to indicate that when STA100 and AP200 establish a Wi-Fi connection on the first resource unit, one or more of the following transmission indicators between STA100 and AP200 are not up to standard: the signal strength from STA100 to AP200, Packet loss rate between STA100 and AP200 or bit error rate between STA100 and AP200. If these transmission indicators do not meet the standards, it indicates that the channel quality of the Wi-Fi transmission channel corresponding to the first resource unit is poor, and the uplink data frame sent by STA100 cannot be sent to AP200 through the Wi-Fi transmission channel corresponding to the first resource unit. Enable the asymmetric transmission function. If these transmission indicators meet the standards, it indicates that the channel quality of the Wi-Fi transmission channel corresponding to the first resource unit is good, and the uplink data frame sent by STA100 can be sent to AP200 through the Wi-Fi transmission channel corresponding to the first resource unit. Enable the asymmetric transmission function.

Specifically, the preset conditions may include one or more of the following conditions: the signal strength from STA100 to AP200 is low, for example, the signal strength from STA100 to AP200 is lower than the first threshold, the packet loss rate between STA100 and AP200 is high, For example, the packet loss rate between STA100 and AP200 is greater than the second threshold, or the bit error rate between STA100 and AP200 is higher, for example, the bit error rate between STA100 and AP200 is greater than the third threshold, and so on. Exemplarily, the AP 200 may periodically monitor the situation that the STA 100 sends the uplink data frame on the first resource unit according to a preset period. Wherein the preset period can be set as required without limitation.

In this embodiment of the present application, the signal strength from STA100 to AP200 may refer to the signal strength from a signal (such as an uplink data frame) sent by STA100 to AP200. The signal strength from STA100 to AP200 may include signal to interference plus noise ratio (signal to interference plus noise ratio, SINR) of the signal received by AP200 from STA100, received signal strength indication (received signal strength indication, RSSI), etc. The first threshold may be a boundary line for judging whether the signal strengths of STA100 to AP200 are high or low. Taking the signal strength from STA100 to AP200 being RSSI as an example, the first threshold may be -65dBm or -75dBm. If the signal strength from STA100 to AP200 is higher than or equal to the first threshold, it means that the signal strength from STA100 to AP200 is high, and there is no need to perform asymmetric transmission. Conversely, if the signal strength from STA100 to AP200 is lower than the first threshold, it means that STA100 The signal strength to AP200 is low and asymmetric transmission needs to be performed.

It should be understood that, in the scenario shown in S502 or method 1 or method 2, for STA100 and AP200, the methods for obtaining the signal strength from STA100 to AP200 are different, for example, the scenario where the asymmetric transmission function is enabled in the method shown in S502 above , the AP200 may calculate the RSSI and/or SINR of the signal sent by the STA100 received by the AP200 to obtain the signal strength from the STA100 to the AP200. In the scenario where the asymmetric transmission function is enabled in the above method 1 or method 2, the STA100 can obtain the signal strength from the STA100 to the AP200 from the AP200.

In the embodiment of the present application, the packet loss rate between STA100 and AP200 may refer to the ratio of the number of downlink data frames not successfully received by STA100 among the downlink data frames sent by AP200 to STA100 within a period of time to the total number of downlink data frames. Alternatively, the packet loss rate between STA100 and AP200 may refer to the ratio of uplink data frames not successfully received by AP200 to the total number of uplink data frames sent by STA100 to AP200 within a period of time. If the packet loss rate between STA100 and AP200 is greater than the second threshold, it means that the channel quality of the Wi-Fi transmission channel corresponding to the first resource unit between STA100 and AP200 is poor, and the normal transmission of uplink data frames cannot be guaranteed. , it means that the channel quality of the Wi-Fi transmission channel corresponding to the first resource unit is good, which can ensure the normal transmission of the uplink data frame. Wherein, the second threshold can be set according to needs and is not limited. For example, the second threshold may be set to 10% or the like.

It should be understood that, in the scenario shown in S502 or method 1 or method 2, for STA100 and AP200, the methods of obtaining the packet loss rate between STA100 and AP200 are different. For example, the method shown in S502 above is used to enable asymmetric transmission In the functional scenario, after AP200 sends a downlink data frame to STA100, it can receive an ACK frame from STA100. The ACK frame can indicate/reflect that the downlink data frame is correctly received by STA100, and AP200 calculates according to the received ACK frame that AP200 sends to STA100 The ratio of the number of downlink data frames that are not successfully received by STA100 to the total number of downlink data frames among the downlink data frames in the STA100 can obtain the packet loss rate between STA100 and AP200. Or AP200 obtains the packet loss rate between STA100 and AP200 from STA100. At this time, the packet loss rate between STA100 and AP200 can be calculated by STA100. The ratio of the total number of uplink data frames is obtained.

In the scenario where the above method 1 or method 2 is used to enable the asymmetric transmission function, after STA100 sends an uplink data frame to AP200, it can receive an ACK frame from AP200, and the ACK frame can indicate/reflect that the uplink data frame is correctly received by AP200, STA100 According to the received ACK frame, calculate the total number of uplink data frames sent by STA100 to AP200 that are not successfully received by AP200 and the total number of uplink data frames to obtain the packet loss rate between STA100 and AP200, or STA100 obtains the packet loss rate between STA100 and AP200 from AP200 The packet loss rate between AP200. At this time, the packet loss rate between STA100 and AP200 can be calculated by AP200. Among the downlink data frames sent by AP200 to STA100, the number of downlink data frames not successfully received by STA100 and the total number of downlink data frames The ratio of the quantity is obtained.

In this embodiment of the application, the bit error rate between STA100 and AP200 greater than the third threshold may refer to the number of coded blocks not successfully received by STA100 and the total number of coded blocks sent by AP200 to STA100 within a period of time ratio. Alternatively, the bit error rate between STA100 and AP200 may refer to the ratio of the coded blocks sent by STA100 to AP200 that are not successfully received by AP200 to the total number of coded blocks within a period of time. If the bit error rate between STA100 and AP200 is greater than the third threshold, it means that the channel quality of the Wi-Fi transmission channel corresponding to the first resource unit between STA100 and AP200 is poor, and the normal transmission of uplink data frames cannot be guaranteed, otherwise , it means that the channel quality of the Wi-Fi transmission channel corresponding to the first resource unit is good, which can ensure the normal transmission of the uplink data frame. Wherein the third threshold can be set as required without limitation, for example, the third threshold can be set to 10%.

It should be understood that in the scenario shown in S502 or method 1 or method 2, for STA100 and AP200, the way to obtain the bit error rate between STA100 and AP200 is different, for example, the method shown in S502 above is used to enable asymmetric transmission In the functional scenario, after AP200 sends the encoded block to STA100, it can receive the ACK frame from STA100. The ACK frame can indicate/reflect that the encoded block is correctly received by STA100. The ratio of the number of coded blocks not successfully received by STA100 in the block to the total number of coded blocks is used to obtain the bit error rate between STA100 and AP200, or AP200 obtains the bit error rate between STA100 and AP200 from STA100. At this time, STA100 The bit error rate between AP200 and AP200 can be obtained by STA100 calculating the ratio of the coded blocks not successfully received by AP200 to the total number of coded blocks among the coded blocks sent by STA100 to AP200.

In the scenario where the above method 1 or method 2 is used to enable the asymmetric transmission function, after STA100 sends the coded block to AP200, it can receive the ACK frame from AP200. The ACK frame can indicate/reflect that the coded block is correctly received by AP200. The received ACK frame calculates the total number of coded blocks and coded blocks not successfully received by AP200 among the coded blocks sent by STA100 to AP200 to obtain the bit error rate between STA100 and AP200, or STA100 obtains the bit error rate between STA100 and AP200 from AP200 Code rate, at this time, the bit error rate between STA100 and AP200 can be obtained by AP200 calculating the ratio of the number of coded blocks not successfully received by STA100 among the coded blocks sent by AP200 to STA100 to the total number of coded blocks.

Wherein, the first indication information may be used to instruct the STA100 to enable the asymmetric transmission function, perform asymmetric transmission, or send uplink data frames according to an asymmetric transmission method. Further, the first indication information may also be used to indicate the uplink resource unit used for sending the uplink data frame. It should be noted that when the uplink resource unit includes the first resource unit and the second resource unit, the first indication information may indicate all uplink resource units, or because STA100 and AP200 have established Wi-Fi under the first resource unit connection, that is, the Wi-Fi transmission channel corresponding to the first resource unit has been established, the first indication information may only indicate resource units other than the first resource unit that can be used to send uplink data frames, such as the second resource unit, etc. . At this time, after receiving the first indication information indicating the second resource unit, the STA100 sends the uplink data frame on the first resource unit and the second resource unit by default.

It should be noted that the embodiment of the present application is not limited to indicating the uplink resource unit to the STA100 through the first indication information, and the AP200 may indicate the uplink resource unit to the STA100 through other information except the first indication information, without limitation.

In this embodiment of the present application, the frequency of the second resource unit can be lower than the frequency of the first resource unit, which can reduce the signal strength loss of the signal sent by STA100 to AP200, so that when the transmit power of STA100 is low, STA100 will uplink The data frame is successfully transmitted to AP200. The second resource unit may include one or more resource units. The second resource unit may be located in a different channel of the same frequency band as the first resource unit, or may be located in a channel of a different frequency band, or the second resource unit may be located in the same channel as the first resource unit, and the two correspond to different subcarriers of the same channel .

In the embodiment of this application, AP200 can determine the second resource unit for STA100 through the following possible design methods: In one possible design, AP200 can determine the second resource unit according to the frequency information corresponding to the first resource unit (such as the frequency band to which the first resource unit belongs) and/or channel) and the resource units available for the STA100 to send the uplink data frame, and select the second resource unit from the resource units available for the STA100 to send the uplink data frame. In yet another possible design, STA100 may determine multiple candidate resource units according to the frequency information corresponding to the first resource unit (such as the frequency band and/or channel to which the first resource unit belongs) and the resource units available for STA100 to send uplink data frames , and indicate the candidate resource units to the AP200, and the AP200 receives and selects a second resource unit from the candidate resource units; wherein, the plurality of candidate resource units are included in the resource units available for the STA100 to send the uplink data frame.

Exemplarily, the AP200 selects the resources available for the STA100 to send the uplink data frame according to the frequency information corresponding to the first resource unit (such as the frequency band and/or channel to which the first resource unit belongs) and the resource units available for the STA100 to send the uplink data frame Selecting the second resource unit from the unit may include the following situations:

Case 1: A frequency band is supported between the STA 100 and the AP 200 , for example, the first frequency band is supported, and the first resource unit belongs to the first channel of the first frequency band. The first frequency band may be a 6GHz frequency band, a 5GHz frequency band, or a 2.4GHz frequency band.

In case one, the second resource unit may include one resource unit. AP200 selects a second channel with a lower frequency than the first channel from the multiple channels included in the first frequency band, and selects a certain resource unit from the second channel as the second resource unit; or, the first channel includes resources In the case of a resource unit, the AP 200 selects a resource unit/subcarrier with a lower frequency than the first resource unit from the first channel as the second resource unit.

It should be noted that, in this embodiment of the application, if a channel has and only has one resource unit, selecting a certain resource unit in the channel as the second resource unit for transmitting uplink data frames can be understood as selecting the channel As a frequency domain resource for transmitting uplink data frames. The resource unit described in the embodiment of the present application may refer to the RU mentioned above, the resource unit is a frequency domain resource of a granularity, and the channel is a frequency domain resource of another granularity. A channel may include one or more resource units. When a channel includes multiple resource units, the resource unit is a frequency domain resource with finer granularity than the channel. When a channel includes a resource unit, or a channel is regarded as (is) a resource unit, the granularity of the two can be regarded as equal, and at this time, a resource unit is equivalent to a channel.

For example, suppose STA100 and AP200 support the 6GHz frequency band, the 6GHz frequency band includes channel 1 and channel 2, the frequency of channel 1 is higher than that of channel 2, channel 1 is 26-tone RU, and the first resource unit includes 26-tone RU of channel 1 In this case, the AP 200 can select the resource units in channel 2 as the second resource units, or select the last 13 subcarriers in the 26-tone RU of channel 1 as the second resource units.

Case 2: Two or more frequency bands are supported between STA100 and AP200, for example, two or more frequency bands in 6GHz frequency band, 5GHz frequency band and 2.4GHz frequency band are supported. The first resource unit belongs to the first channel of the first frequency band in the two or more frequency bands.

In case two, the second resource unit may include one resource unit. AP200 may select a second channel with a frequency lower than the first channel from the channels included in the first frequency band, and use resource units in the second channel as the second resource unit; or, AP200 selects a frequency lower than the first channel from the first channel. The resource unit of the first resource unit is used as the second resource unit; or, the AP200 selects a second frequency band whose frequency is lower than the first frequency band from two or more frequency bands, selects a channel from the channels included in the second frequency band, and sets The resource units in the channel serve as the second resource units.

In the second case, the second resource unit may include multiple resource units, for example, the second resource unit includes two or more resource units. Taking two resource units as an example, the AP 200 may select the second channel and the third channel with frequencies lower than the first channel from the channels included in the first frequency band, and use the resource units in the second channel and the third channel as The second resource unit; or, the AP200 selects a plurality of resource units with a frequency lower than the first resource unit from the first channel as the second resource unit; or, the AP200 selects a plurality of resource units with a frequency lower than the first resource unit from two or more frequency bands. For the second frequency band and the third frequency band of the frequency band, select a channel from the channels included in the second frequency band, select a channel from the channels included in the third frequency band, and use the resource units in the selected channels as the second resource units; or , AP200 selects a second frequency band whose frequency is lower than the first frequency band from two or more frequency bands, selects multiple channels from the channels included in the second frequency band, and assigns the resource units in the selected channels and the first resource units as the second resource unit.

For example, STA100 supports 6GHz frequency band, 5GHz frequency band and 2.4GHz frequency band. As shown in FIG. 5a, if the first resource unit belongs to the 6GHz frequency band, the AP 200 determines to use resource units in the 5GHz or 2.4GHz frequency band to send the uplink data frame. If the first resource unit does not belong to the 6GHz frequency band but belongs to the 5GHz frequency band, it is determined to use the resource units in the 2.4GHz frequency band to send the uplink data frame. If the first resource unit belongs to the 2.4GHz frequency band, it is determined to use the second resource unit in the 2.4GHz frequency band whose frequency is lower than the first resource unit to send the uplink data frame. At this time, the first resource unit and the second resource unit correspond to the 2.4GHz frequency band different subcarriers of the same channel, or the frequency of the 2.4GHz channel where the second resource unit is located is lower than the frequency of the 2.4GHz channel where the first resource unit is located.

For another example, assume that the uplink resource unit includes the second resource unit and the first resource unit, and the STA 100 supports a 6GHz frequency band, a 5GHz frequency band and a 2.4GHz frequency band. As shown in FIG. 5b, if the first resource unit belongs to the 6GHz frequency band, the AP 200 determines to use the resource units in the 5GHz and 6GHz, or 6GHz and 2.4GHz frequency bands to send the uplink data frame. If the first resource unit does not belong to the 6GHz frequency band but belongs to the 5GHz frequency band, it is determined to use the resource units in the 5GHz and 2.4GHz frequency bands to send the uplink data frame. If the first resource unit belongs to the 2.4GHz frequency band, it is determined to use a resource unit (such as the second resource unit) and the first resource unit with a frequency lower than the first resource unit in the 2.4GHz frequency band to send the uplink data frame. At this time, the first resource The unit and the second resource unit correspond to different subcarriers of the same channel in the 2.4GHz frequency band, or the frequency of the 2.4GHz channel where the second resource unit is located is lower than the frequency of the 2.4GHz channel where the first resource unit is located.

It should be noted that S502 may be performed when the AP 200 and the STA 100 have asymmetric transmission capabilities at the same time. Wherein, as described in S501, the STA100 may indicate to the AP200 that the STA100 has the asymmetric transmission capability, for example, indicate to the AP200 through an association request frame.

S503: The STA100 receives the first indication information, and enables the asymmetric transmission function according to the first indication information.

Exemplarily, after the STA100 enables the asymmetric transmission function, a Wi-Fi transmission channel for sending uplink data frames may be set on the STA100 side. For example, after receiving the first indication information, the STA100 triggers the processor 301 to set a Wi-Fi transmission channel for sending uplink data frames. Correspondingly, a Wi-Fi transmission channel for receiving uplink data frames is set on the AP 200 side. Wherein, setting the Wi-Fi transmission channel for sending/receiving the uplink data frame may include:

In one example, if STA100 and AP200 have a dual band single concurrent (DBDC) function, for example, STA100 and AP200 support simultaneous operation in the 2.4GHz frequency band and the 5GHz frequency band, at this time, if the first resource unit corresponds to the first frequency band, the second resource unit corresponds to the second frequency band, the first frequency band is different from the second frequency band, that is, the first resource unit and the second resource unit belong to different channels in different frequency bands, then STA100 needs to send to AP200 the information corresponding to the establishment of the second resource unit The request for the Wi-Fi transmission channel is to establish the Wi-Fi transmission channel corresponding to the second resource unit, that is, to add the second resource unit on the basis of the Wi-Fi transmission channel corresponding to the first resource unit established in S501 Corresponding Wi-Fi transmission channel. At this time, when the uplink resource unit includes the first resource unit and the second resource unit, STA100 can send to AP200 through the Wi-Fi transmission channel corresponding to the first resource unit and the Wi-Fi transmission channel corresponding to the second resource unit. An uplink data frame; or, in the case that the uplink resource unit includes the second resource unit, the STA100 may send the uplink data frame to the AP200 through the Wi-Fi transmission channel corresponding to the second resource unit.

In another example, if the second resource unit and the first resource unit correspond to two different channels of the same frequency band, because the Wi-Fi transmission channel of the frequency band is using the first resource unit to transmit uplink data frames and/or downlink data frames has been established, the STA100 does not need to initiate a request to the AP 200 for establishing the Wi-Fi transmission channel corresponding to the second resource unit, and does not need to re-establish the Wi-Fi transmission channel corresponding to the second resource unit. At this time, the Wi-Fi transmission channel established in S501 can support the STA100 to send uplink data frames to the AP200 on the first resource unit and the second resource unit.

In another example, STA100 and AP200 work in duplex mode, and there is a radio frequency chip corresponding to STA100 and AP200, and the radio frequency chip supports duplex mode, and supports sending and receiving data frames at the same time on the resource unit corresponding to the radio frequency chip. For example, the radio frequency chip may correspond to the first resource unit and the second resource unit, and supports simultaneous transmission of downlink data frames on the first resource unit and uplink data frame transmission on the second resource unit. It should be understood that in this embodiment of the present application, the transmission of downlink data frames on the first resource unit can be replaced by the transmission of downlink data frames on the Wi-Fi transmission channel corresponding to the first resource unit, and the transmission of uplink data frames on the second resource unit The frame can be alternatively described as transmitting an uplink data frame on the Wi-Fi transmission channel corresponding to the second resource unit.

In a possible implementation, one radio frequency chip can correspond to one or more Wi-Fi transmission channels. Establish a Wi-Fi transmission channel, or multiple resource units correspond to multiple Wi-Fi transmission channels, etc. one by one. In the case where the radio frequency chip corresponds to a Wi-Fi transmission channel, that is, when multiple resource units corresponding to the radio frequency chip share the same Wi-Fi transmission channel, at this time, as described in S501, between STA100 and AP200 After the Wi-Fi connection is established, in order to be able to transmit uplink data packets and/or downlink data packets on the first resource unit, the radio frequency chip is in the working state, and the Wi-Fi transmission channel corresponding to the radio frequency chip has been established, then STA100 does not need to initiate a request to AP200 to establish a Wi-Fi transmission channel corresponding to the second resource unit, and does not need to re-establish the Wi-Fi transmission channel corresponding to the second resource unit. The data frame is sent and received on the unit and the second resource unit. When the radio frequency chip corresponds to multiple Wi-Fi transmission channels, that is, when the multiple resource units corresponding to the radio frequency chip correspond to a Wi-Fi transmission channel, STA100 initiates to AP200 to establish a Wi-Fi network corresponding to the second resource unit. - A request for a Fi transmission channel, establishing a Wi-Fi transmission channel corresponding to the second resource unit. At this time, the uplink data frame may be transmitted through the Wi-Fi transmission channel corresponding to the second resource unit, and the downlink data frame may be transmitted through the Wi-Fi transmission channel corresponding to the first resource unit.

So far, asymmetric transmission can be performed between AP200 and STA100. AP200 sends downlink data frames to STA100 on a higher frequency, and STA100 sends uplink data frames to AP200 on a lower frequency. Since the working frequency is proportional to the free space loss, the free space loss generated by STA100 sending uplink data frames at a lower frequency is lower, which reduces the signal strength attenuation from STA100 to AP200. In this way, when the transmit power of STA100 is low Next, the STA100 can transmit the uplink data frame to the AP200 to ensure that the AP200 receives the uplink data frame sent by the STA100.

Further, the method shown in Figure 5a or Figure 5b may also include:

S504: STA100 sends an uplink data frame to AP200 on an uplink resource unit through the Wi-Fi connection between STA100 and AP200. Correspondingly, the AP200 receives the uplink data frame sent by the STA100 on the uplink resource unit.

In a possible design, the application layer of STA100 can actively generate uplink service data, and process the uplink service data through the protocol layer shown in Figure 4a or Figure 4b to obtain the uplink data frame in the frame format shown in Figure 9a. The unit sends uplink data frames to AP200. Further, the AP 200 may return the downlink data frame in the format shown in FIG. 9 b to the STA 100 according to whether it successfully receives the uplink data frame.

In yet another possible design, the uplink data frame corresponds to the downlink data frame transmitted on the first resource unit. For example, the uplink data frame may be used to indicate that the downlink data frame is successfully received by the STA100, and the uplink data frame may include information related to the downlink data frame. Acknowledgment (acknowledge, ACK) information and/or non-acknowledgement (non-acknowledge, NACK) information corresponding to the frame. The ACK information is used to indicate that the downlink data frame is successfully received by the STA100, and the NACK information is used to indicate that the downlink data frame is not successfully received by the STA100. For example, binary bit 0 can be used as NACK information to indicate that the downlink data frame is not successfully received by STA100, and binary bit 1 can be used as ACK information to indicate that the downlink data frame is successfully received by STA100. Alternatively, binary bit 1 may be used as NACK information to indicate that the downlink data frame was not successfully received by STA100, and binary bit 0 may be used as ACK information to indicate that the downlink data frame was successfully received by STA100, without limitation.

At this time, before S504, AP200 can obtain the downlink service data sent to STA100, after processing the uplink service data through the protocol layer shown in Figure 4a or Figure 4b to obtain the downlink data frame in the frame format shown in Figure 9a, after A downlink data frame including downlink service data is sent to the STA 100 in one resource unit. Correspondingly, the STA100 receives the downlink data frame on the first resource unit, parses the received downlink data frame, generates an uplink data frame as shown in FIG. An uplink data frame in the format shown in Figure 9b.

It should be noted that the application does not limit the naming of the data frame shown in Figure 9b, the data frame shown in Figure 9b can be called an ACK frame or a hyperlink block ack (Hilink block ack, HiBA) frame, the data in this format The frame can be used to indicate that the data frame sent by the sender to the receiver has been successfully received by the receiver.

Take STA100 sending uplink data frames on a single frequency band as an example. For example, as shown in Figure 6a, AP200 can use 6GHz to send downlink data frames to STA100. After receiving the downlink data frames, STA100 can use 2.4GHz to send uplink data frames to AP200. . For another example, as shown in FIG. 6b, AP200 may use 6GHz to send downlink data frames to STA100, and STA100 may use 5GHz to send uplink data frames to AP200 after receiving the downlink data frames. For another example, as shown in FIG. 6c, AP200 may use 5GHz to send downlink data frames to STA100, and STA100 may use 2.4GHz to send uplink data frames to AP200 after receiving the downlink data frames.

Take STA100 sending uplink data frames on dual frequency bands as an example, as shown in Figure 7a, AP200 can use 6GHz to send downlink data frames to STA100, and STA100 can use 6GHz and 2.4GHz to send uplink data frames to AP200 after receiving the downlink data frames . For another example, as shown in FIG. 7b , AP200 can use 6GHz to send downlink data frames to STA100, and STA100 can use 6GHz and 5GHz to send uplink data frames to AP200 after receiving the downlink data frames. For another example, as shown in FIG. 7c, AP200 may use 5GHz to send downlink data frames to STA100, and after receiving the downlink data frames, STA100 may use 5GHz and 2.4GHz to send uplink data frames to AP200.

It should be noted that, in this embodiment of the present application, the downlink data frame that the AP 200 may send on the first resource unit may include multiple downlink data frames corresponding to the STA 100, and may also include downlink data frames corresponding to one or more other STAs, No restrictions. At the same time, the service type of the downlink service data included in the downlink data frame is not limited, and may be downlink service data of different priorities. For example, taking STA as a mobile phone as an example, if only mobile phone A establishes a Wi-Fi connection with the AP on the first resource unit, the downlink data frame sent by the AP on the first resource unit only includes multiple downlink data corresponding to mobile phone A frame. If mobile phone A and mobile phone B both establish Wi-Fi connections on the first resource unit with the AP, the downlink data frame sent by the AP on the first resource unit may include the downlink data frame corresponding to mobile phone A and the downlink data frame corresponding to mobile phone B . In addition, the data frame (downlink data frame or uplink data frame) described in the embodiment of the present application may be described as a data message or an Ethernet frame or an Ethernet message instead, without limitation.

It should be noted that, in the embodiment of the present application, downlink service data and uplink service data are relative concepts, and both may be collectively referred to as service data. The downlink service data may refer to service data sent from the AP to the STA, and the uplink service data may refer to service data sent from the STA to the AP. The business data can be processed through the protocol layer as shown in Figure 4a or Figure 4b to generate a data frame including business data, the business data can be carried in the load (payload) of the data frame, at this time, the field carrying the business data can be called a business data bearer. As shown in Figure 9a, the service data bearer in Figure 9a may refer to the field carrying service data, if the service data is downlink service data, then the field may be called downlink service data bearer, if the service data is uplink service data, Then this field may be called uplink service data bearer.

In this embodiment of the present application, the AP200 sending the downlink data frame including the downlink service data to the STA100 on the first resource unit may include: the AP200 obtains the downlink service data sent to the STA100, such as obtaining the downlink service data from the server side; The service data is sequentially processed through the presentation layer, session layer, transport layer, and network layer shown in Figure 4a to generate IP packets including downlink service data, TCP/UDP frame headers, and IP frame headers, or the downlink service data is sequentially passed through as shown in Figure 4b The presentation layer and the network layer shown in the figure process and generate IP packets including downlink service data, TCP/UDP frame headers and IP frame headers, and deliver the IP packets to the asymmetric transport layer. After receiving the IP packet, the asymmetric transmission layer encapsulates the first frame header on the IP packet to generate an asymmetric transmission packet/asymmetric transmission message. The format of the asymmetric transmission packet/asymmetric transmission message is shown in Figure 9a. Submit the generated asymmetric transmission packet/asymmetric transmission message to the 802.11 data link layer and 802.11 physical layer for processing to generate a downlink data frame, and send the downlink data frame to STA100 through the Wi-Fi transmission channel corresponding to the first resource unit .

Similarly, in this embodiment of the present application, STA100 sending an uplink data frame including uplink service data to AP200 on an uplink resource unit may include: STA100 generates/obtains uplink service data, and STA100 sequentially passes the uplink service data through the representation shown in Figure 4a Layer, session layer, transport layer, and network layer process and generate IP packets including uplink business data, TCP/UDP frame headers, and IP frame headers, or process uplink business data through the presentation layer and network layer shown in Figure 4b to generate IP packets that include Uplink service data, TCP/UDP frame header and IP packet of IP frame header, and submit the IP packet to the asymmetric transport layer. After the asymmetric transmission layer receives the IP packet, it encapsulates the first frame header on the IP packet to generate an asymmetric transmission packet/asymmetric transmission message, and submits the generated asymmetric transmission packet/asymmetric transmission message to the 802.11 data link The uplink data frame is generated after processing by the road layer and the 802.11 physical layer, and the uplink data frame is sent to the AP200 through the Wi-Fi transmission channel corresponding to the uplink resource unit.

It should be understood that the asymmetric transmission packet/asymmetric transmission message described in this application is only an exemplary description, and the asymmetric transmission packet/asymmetric transmission message in the format shown in Figure 9a can also be named by other names, without limitation . In addition, the data frame (downlink data frame or uplink data frame) generated by the 802.11 data link layer and the 802.11 physical layer processing asymmetric transmission packets/asymmetric transmission messages can not only include existing fields, such as virtual LAN flags (virtual local area network flags). local network tag, VLAN TAG) fields, etc., can also include the first frame header, that is, the first frame header cannot be lost in the processing of asymmetric transmission packets/asymmetric transmission packets at the 802.11 data link layer and 802.11 physical layer. Ensure that the receiving end can know which data frames are sent by the sending end through which channels through the first frame header.

As shown in Fig. 9a, the asymmetric transmission packet/asymmetric transmission message may include: 802.3MAC frame header, first frame header, IP frame header, TCP/UDP frame header and service data bearer. Wherein, the relevant description and encapsulation method of the 802.3MAC frame header, IP frame header, and TCP/UDP frame header can refer to the prior art, and will not be repeated here.

Wherein, the first frame header is a newly added frame header provided by the embodiment of the present application, and the first frame header may be named as an extended frame header or other names without limitation. The first frame header may include the fields shown in Table 2 below: frame sequence number, channel number, sub-channel sequence number, and reserved bits. The frame sequence number may not be carried. It should be noted that the length of each field is not limited to that shown in Table 2, and may also be other lengths. In addition, the names of the fields are not limited to those shown in Table 2, and can also be named as other names. In addition, the fields included in the first frame header are not limited to those described in Table 2 below, and new fields may also be extended. In this way, a suitable channel (such as a traffic identifier (TID) queue) can be used to transmit service data according to the priority of the service data included in the data frame, so as to ensure the transmission requirements of the service data and improve the transmission efficiency of the service data.

Optionally, in order for the receiving end to know whether the data frame includes the first frame header, it is convenient for the receiving end to accurately parse the data frame, and then know which data frames are sent by the sending end through which channels according to the first frame header. The data frame generated by the 802.11 data link layer and the 802.11 physical layer processing the asymmetric transmission packet/asymmetric transmission message in the format shown in Figure 9a may include a first field, and the value of the first field may indicate whether there is a first field. frame header. For example, the first field can be an Ethernet type (Ether Type) field. If the value of the Ether Type field is a preset value, such as 0x8888, it indicates that there is a first frame header in the data frame. Otherwise, if the first field If the value of the Ether Type field is other than the preset value, it indicates that the first frame header does not exist in the data frame. Specifically, in the data frame, the first field may be located in the VLAN TAG field or other fields in the data frame, without limitation. The first field may be carried in an asymmetric transmission packet/asymmetric transmission message, and submitted by the asymmetric transmission layer to the 802.11 data link layer and the 802.11 physical layer. Specifically, as shown in FIG. 9a, the first field may be located in the 802.3MAC frame header in the asymmetric transmission packet/asymmetric transmission message shown in FIG. 9a.

The following is an introduction to each field in Table 2:

The frame sequence number may refer to the sequence numbers of service data (or IP data packets/IP data frames) sent to the same user/receiving end and belonging to the same service data flow when they arrive at the sending end. Taking the AP200 as an example as the sending end, the frame sequence number may refer to the sequence number in which service data arrives at the AP200. For example, assuming that AP200 receives 10 service data sent to STA100 one after another, and these 10 service data belong to the same service data flow, the 10 service data can be numbered as 0-9 according to the order in which these 10 service data arrive at AP200 Or 1-10, etc., that is, the frame sequence numbers corresponding to the 10 service data are 0-9 or 1-10, and the value of the initial number is not limited.

The channel number can be described as TID instead, and the channel number can indicate the TID queue used by the sender to transmit data frames to the receiver. A user corresponds to a group of TID queues, and different users correspond to different TID queues. For the same user, the value range of the channel number can be the index 0-7 of the TID queue, that is, there are 8 different channel numbers/TID queues for the same user, and these 8 different channel numbers/TID queues correspond to 8 priority class. The corresponding relationship between the channel number/TID and the priority is pre-set according to the need and is not limited. For example, suppose TID queue 1 corresponds to priority 1, TID queue 2 corresponds to priority 2, and the 10 data frames sent to STA100 have different priorities, data frames 0-2 correspond to the same priority 1, and data frames 3-4 correspond to the same priority. Priority 2, data frames 5-7 in data frames 5-9 correspond to the same priority 1, and data frames 8-9 correspond to the same priority 2, then the data frames with frame sequence numbers 0-2, 5-7 can be Transmit through TID queue 1, and transmit data frames with frame sequence numbers 3-4 and 8-9 through TID queue 2.

The sub-channel sequence number may identify sequence numbers of data frames sent continuously in one TID queue for the same user. The sequence number of the subchannel can be determined according to the number of data frames sent continuously in the TID queue. For example, data frames with frame sequence numbers 0-2 and 5-7 are transmitted through TID queue 1, and these six data frames can be correspondingly numbered as 15-19. The data frames whose frame sequence numbers are 3-4 and 8-9 are transmitted through TID queue 2, and these four data frames can be correspondingly numbered as 25-28.

The reserved field occupies 2 bits, and the reserved field can be used as an extended field to expand a new field.

Table II

As shown in FIG. 9b, the data frame in the format shown in FIG. 9b may include: an IP frame header, a UDP frame header, a second frame header, and a frame check sequence (frame check sequence, FCS) field. Wherein, the relevant description and encapsulation method of the IP frame header, UDP frame header and FCS field can refer to the prior art, and will not be repeated here.

Wherein, the second frame header is a newly added frame header provided by the embodiment of the present application, and the second frame header may be named as an extended frame header or other names without limitation. The second frame header may include the fields shown in Table 3 below: resource unit identifier, channel number, starting sequence number, and Bitmap. The second frame header can also include a frequency band identifier (band ID), a VAP ID, and a Bitmap length. It should be noted that the length of each field is not limited to that shown in Table 3, and may also be other lengths. In addition, the names of each field are not limited to those shown in Table 3, and may be named as other names. In addition, the fields included in the second frame header are not limited to those described in Table 3 below, and new fields may also be extended.

The fields in Table 3 are introduced as follows:

The frequency band identifier can be used to identify the frequency band used to send the data frame, and the frequency band identifier can occupy 3 bits. The value range of the frequency band identifier is 0-3, and different values correspond to different frequency bands. For example, when the value is 0, it corresponds to the 2.4G frequency band; when the value is 1, it corresponds to the 5GHz frequency band; when the value is 2, it corresponds to the 6GHz frequency band. When the value is 3, it is reserved.

A virtual access point identifier (virtual access point identifier, VAP ID) may be used to indicate the VAP ID index corresponding to the SSID established on the Wi-Fi frequency band. The VAP ID index can be used to indicate the VAP corresponding to the transmission service between the AP200 and the STA100.

The identifier of the resource unit may be used to indicate the resource unit for transmitting the data frame, for example, it may indicate the channel or RU for transmitting the data frame.

The relevant description of the TID can be referred to above without limitation.

The start sequence number can indicate the subchannel sequence number corresponding to the start bit of the Bitmap, and the start sequence number occupies 2 bytes (Bytes). According to the starting sequence number and the Bitmap, it can be known whether the data frames of several consecutive transmissions starting from which data frame in the TID queue are successfully received by the receiving end.

The Bitmap length may indicate the mask length corresponding to the Bitmap or the number of binary bits included in the Bitmap (or called the length of the Bitmap), and the field of the Bitmap length may occupy 5 bits. The value range of the Bitmap length field can be 0-4. Take the bitmap length indicating the number of binary bits included in the Bitmap as an example. When the value of the Bitmap length is 0, it indicates that the number of binary bits included in the Bitmap is 0; when the value of the Bitmap length is 1, it indicates the number of binary bits included in the Bitmap. for 4. When the value of the Bitmap length is 2, it indicates that the number of binary bits included in the Bitmap is 8. When the value of the Bitmap length is 3, it indicates that the number of binary bits included in the Bitmap is 16. When the value of the Bitmap length is 4, it indicates that the Bitmap includes 32 binary bits. The value of the Bitmap length can be preset or default, and the number of binary bits included in the Bitmap can be preset or default. It should be understood that the embodiment of the present application is not limited to the value of the Bitmap length, the number of binary bits included in the Bitmap, and the number of binary bits included in the Bitmap may also be 64, 128, and so on.

The Bitmap may include NACK information and/or ACK information, which is a binary bit string, and the Bitmap may be used to indicate whether the data frame is received correctly. The Bitmap may include multiple binary bits corresponding to multiple downlink data frames sent to the receiving end, and the value of one binary bit is used to indicate whether the data frame corresponding to the binary bit is successfully received by the receiving end. For example, if the corresponding bit is 0, it means that the data frame is received abnormally/failed; if the corresponding bit is 1, it means that the data frame is received successfully. It should be noted that Table 3 is only an exemplary description, and alternatively, the corresponding bit is 1, indicating that the data frame reception is abnormal/failed; the corresponding bit is 0, indicating that the data frame is received successfully, without limitation.

Table three

For example, take AP200 sending a downlink data frame including downlink service data to STA100, STA100 receives the downlink data frame, and feeds back the uplink data frame including Bitmap to AP200 according to the receiving situation. Downlink data frames, the frame sequence numbers of these 10 downlink data frames are 0-9, these 10 downlink data frames are transmitted through TID queue 1, and the corresponding sub Channel serial numbers are 10-19. Then the first frame header in the first downlink data frame may include: frame sequence number 0, channel number: TID queue 1, and subchannel sequence number 10. By analogy, the first frame header in the tenth downlink data frame may include: frame sequence number 9, channel number: TID queue 1, and subchannel sequence number 19. STA100 receives these 10 downlink data frames on channel 36 of 5GHz. According to the first frame header in the downlink data frame, STA100 can know that AP200 sends 10 downlink data frames to itself through TID queue 1. These 10 downlink data frames The serial numbers of the sub-channels are 10-19. If the STA100 fails to receive the downlink data frames sent to itself with frame sequence numbers 0 and 1 (the corresponding subchannel sequence numbers are 10 and 11), other downlink data frames are successfully received. Assume that STA100 uses 2 channels of 2.4GHz to send an uplink data frame including Bitmap to AP200. The number of binary bits included in Bitmap is 32, where the bit value in Bitmap is 0 to indicate unsuccessful reception, and the bit value to 1 indicates successful reception. In combination with Table 3, it can be seen that the second frame header in the uplink data frame sent by STA100 on 2 channels of 2.4GHz may include: the frequency band identifier 2.4GHz, the VAP ID index corresponding to the SSID corresponding to 2.4GHz, 2 channels, and the TID queue 1. The starting sequence number is 10, the Bitmap length is 4, and the Bitmap: 00111111 11000000 00000000 00000000. Correspondingly, AP200 can receive the uplink data frame sent by STA100 on the 2.4GHz channel 2. According to the Bitmap included in the second frame header of the uplink data frame: 00111111 11000000 00000000 00000000, the sub-channel transmitted through TID queue 1 can be known Among the downlink data frames with sequence numbers 10-19, the two downlink data frames with subchannel sequence numbers 10 and 11 are not successfully received by STA100, and the downlink data frames with subchannel sequence numbers 12-19 are successfully received by STA100.

In the embodiment of the present application, the processing process of the 802.11 data link layer and the 802.11 physical layer at the sending end may include forward error correction (forward error correction, FEC), interleaving-mapping (interleaving-mapping), fast Fourier inverse transform (inverse fast fourier transform, IFFT), guard interval (guard interval, GI) addition (GI addition), symbol beamforming (symbol wave shaping), quadrature (I/Q) modulation (mod), high-power amplifier (high-power amplifier , HPA), etc., the processing details of these processes can refer to the prior art, and will not be repeated here. Correspondingly, after the receiving end receives the data frame sent by the sending end, it will be processed by the 802.11 data link layer and the 802.11 physical layer of the receiving end. The reverse process, the processing of the 802.11 data link layer and 802.11 physical layer at the receiving end can include low noise amplifier (LNA), HPA, I/Q demodulation (det), GI removal (remove GI), fast Fourier transform (fast fourier transform, FFT), demapping deinterleaving (demapping deinterleaving), and FEC decoding, etc. Specifically, for the processing details of these processes, reference may be made to the prior art, which will not be repeated here.

It should be noted that the sending end and receiving end described in the embodiments of the present application are relative concepts, the sending end may refer to the device that sends the data frame to the receiving end, and the receiving end may refer to the device that receives the data frame sent by the sending end. For example, taking AP200 sending a data frame to STA100 as an example, AP200 is the sending end, and STA100 is the receiving end. Taking STA100 sending a data frame to AP200 as an example, STA100 is the sending end, and AP200 is the receiving end.

For example, if the downlink works in the 5GHz frequency band and the uplink works in the 2.4GHz frequency band as an example, AP200 can convert the downlink data frame sent to STA100 into an 802.11 frame format in the manner shown in Figure 8a, and send it to STA100 through the 5GHz frequency band. STA100 Receive downlink data frames in the 5GHz frequency band. Similarly, referring to FIG. 8b, after receiving the downlink data frame sent by AP200, STA100 can use 2.4GHz to send uplink data frame to AP200, and AP200 receives the uplink data frame in the 2.4GHz frequency band accordingly.

In the embodiment of the present application, when the uplink data frame carried in the uplink data frame is the ACK information and/or NACK information of the downlink data frame transmitted on the first resource unit, in order to improve the transmission efficiency of the downlink data frame, the AP200 The accumulative packet loss rate of the downlink data frames can be determined according to the uplink data frames, and then the downlink air interface rate of the AP200 can be adjusted according to the accumulative packet loss rate of the downlink data frames.

In the embodiment of the present application, the cumulative packet loss rate of the downlink data frame is determined according to the uplink data frame, and the execution action of adjusting the downlink air interface rate of the AP200 according to the cumulative packet loss rate of the downlink data frame can be performed by the 802.11 data link layer in the AP200, It may also be performed by an asymmetric transport layer in AP 200 without limitation. For example, when the AP 200 works in the ACK mode, the 802.11 data link layer of the AP 200 executes this process. When AP200 works in NO_ACK mode, the asymmetric transmission layer of AP200 determines the cumulative packet loss rate of downlink data frames according to the uplink data frames, and then adjusts the downlink air interface rate of AP200 according to the cumulative packet loss rate of downlink data frames. That is, in the No_ACK mode, the 802.11 data link layer does not perform downlink air interface rate control, and performs downlink air interface rate control in the asymmetric transmission layer. In ACK mode, the downlink air interface rate is controlled by the 802.11 data link layer.

Exemplarily, the AP 200 determines the cumulative packet loss rate of the downlink data frame according to the uplink data frame, and adjusting the downlink air interface rate of the AP 200 according to the cumulative packet loss rate of the downlink data frame may include:

The AP200 periodically counts the received uplink data frames, and determines the transmission status of the downlink data frames according to the Bitmap carried by the uplink data frames. For example, as shown in Table 3, the bit in the Bitmap is 0, indicating that the data frame reception is abnormal/failed by STA100 Receive; the bit in the Bitmap is 1, indicating that the data frame is successfully received. The statistical period is preset, which can be 100ms/50ms and so on. AP200 calculates the packet loss rate according to the formula: packet loss rate PER = number of downlink data frames not successfully received by STA100/total number of downlink data frames, and then calculates the cumulative packet loss rate: cumulative packet loss rate PER = previous calculation cycle PER *7/8+current PER*1/8; determine the downlink air interface rate based on the accumulated packet loss rate. For example: when the cumulative packet loss rate PER>15%, reduce the current downlink air interface rate, if the current downlink air interface rate is the minimum downlink air interface rate, keep the rate unchanged; when the cumulative packet loss rate PER<3%, increase the downlink air interface rate Rate, if the current downlink air interface rate is the maximum downlink air interface rate, keep the downlink air interface rate unchanged; when 3%≤cumulative packet loss rate PER≤15%, keep the current downlink air interface rate unchanged.

Further, AP200 can monitor whether STA100 satisfies the above preset conditions when sending uplink data frames to AP200 on the second resource unit, if so, continue to maintain asymmetric transmission, and if not, send second indication information to STA100 , the second indication information may be used to instruct the STA100 to disable the asymmetric transmission function. The STA100 receives the second indication information, disables the asymmetric transmission function according to the second indication information, and sends the uplink data frame to the AP200 on the first resource unit.

It can be understood that, in order to realize the above functions, the STA and the AP include hardware and/or software modules corresponding to each function. Combining the algorithm steps of each example described in the embodiments disclosed herein, the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a certain function is executed by hardware or computer software drives hardware depends on the specific application and design constraints of the technical solution. Those skilled in the art may use different methods to implement the described functions in combination with the embodiments for each specific application, but such implementation should not be regarded as exceeding the scope of the present application.

In this embodiment, the functional modules of the STA and the AP may be divided according to the above method example. For example, each functional module may be divided corresponding to each function, or two or more functions may be integrated into one processing module. The above integrated modules may be implemented in the form of hardware. It should be noted that the division of modules in this embodiment is schematic, and is only a logical function division, and there may be other division methods in actual implementation.

In the case of dividing each functional module corresponding to each function, the STA100 and AP200 involved in the above embodiment may include: a sending unit, a receiving unit, a processing unit, and the like. It should be noted that all relevant content of the steps involved in the above method embodiments can be referred to the function description of the corresponding function module, and will not be repeated here.

The embodiment of the present application also provides a communication device, which may be the above-mentioned STA100 or AP200. As shown in FIG. 10 , the communication device may include: one or more processors 1001 , a memory 1002 , and a communication interface 1003 , and the above components may be connected through one or more communication buses 1004 . Wherein the one or more computer programs are stored in the above-mentioned memory 1002 and configured to be executed by the one or more processors 1001, the one or more computer programs include instructions, and the above-mentioned instructions can be used to implement the above-mentioned embodiments , each step executed by STA100 or AP200 or each step executed by the tag device. Wherein, all relevant content of each step involved in the above method embodiment can be referred to the functional description of the corresponding physical device, and will not be repeated here.

Exemplarily, the above-mentioned processor 1001 may specifically be the processor 301 and the processor 307 shown in FIG. 3, the above-mentioned memory 1002 may be specifically the memory 304 shown in FIG. -Fi communication module 303.

The embodiment of the present application also provides a communication device, including one or more processors and one or more memories. The one or more memories are coupled with one or more processors, the one or more memories are used to store computer program codes, the computer program codes include computer instructions, and when the one or more processors execute the computer instructions, cause the communication device to perform The above related method steps implement the asymmetric transmission method in the above embodiment.

Embodiments of the present application also provide a computer-readable storage medium, in which computer instructions are stored, and when the computer instructions are run on the communication device, the communication device is made to perform the steps performed by STA100 in the above-mentioned related methods , or execute the steps of AP200 in the above-mentioned related method to implement the asymmetric transmission method in the above-mentioned embodiment.

The embodiment of the present application also provides a computer program product. When the computer program product is run on a computer, it causes the computer to execute the steps performed by STA100 in the above-mentioned related methods, or execute the steps performed by AP200 in the above-mentioned related methods, so as to realize the above-mentioned An asymmetric transmission method in an embodiment.

In addition, an embodiment of the present application also provides a device, which may specifically be a chip (such as an NFC chip), a component or a module, and the device may include a connected processor and a memory; wherein the memory is used to store computer-executable instructions, When the device is running, the processor can execute the computer-executed instructions stored in the memory, so that the device executes the steps performed by STA100 in the above-mentioned related methods, or executes the steps performed by AP200 in the above-mentioned related methods, so as to realize the asymmetric transmission method in the above-mentioned embodiments .

In addition, the embodiment of the present application also provides an STA, which can execute the steps performed by the above-mentioned STA100 to implement the asymmetric transmission method in the above-mentioned embodiment. The embodiment of the present application also provides an AP that can execute the steps performed by the above-mentioned AP 200 to implement the asymmetric transmission method in the above-mentioned embodiment.

Wherein, the communication device, computer-readable storage medium, computer program product, communication device, STA or AP provided in this embodiment are all used to execute the corresponding method provided above, therefore, the beneficial effect it can achieve can be With reference to the beneficial effects in the corresponding method provided above, details will not be repeated here.

Through the description of the above embodiments, those skilled in the art can understand that for the convenience and brevity of the description, only the division of the above functional modules is used as an example for illustration. In practical applications, the above functions can be assigned by different Completion of functional modules means that the internal structure of the device is divided into different functional modules to complete all or part of the functions described above.

In the several embodiments provided in this application, it should be understood that the disclosed devices and methods may be implemented in other ways. For example, the device embodiments described above are only illustrative. For example, the division of the modules or units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be Incorporation or may be integrated into another device, or some features may be omitted, or not implemented. In another point, the mutual coupling or direct coupling or communication connection shown or discussed may be through some interfaces, and the indirect coupling or communication connection of devices or units may be in electrical, mechanical or other forms.

The unit described as a separate component may or may not be physically separated, and the component displayed as a unit may be one physical unit or multiple physical units, that is, it may be located in one place, or may be distributed to multiple different places . Part or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, each unit may exist separately physically, or two or more units may be integrated into one unit. The above-mentioned integrated units can be implemented in the form of hardware or in the form of software functional units.

If the integrated unit is realized in the form of a software function unit and sold or used as an independent product, it can be stored in a readable storage medium. Based on this understanding, the technical solution of the embodiment of the present application is essentially or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product, and the software product is stored in a storage medium Among them, several instructions are included to make a device (which may be a single-chip microcomputer, a chip, etc.) or a processor (processor) execute all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned storage medium includes: various media that can store program codes such as U disk, mobile hard disk, read only memory (ROM), random access memory (random access memory, RAM), magnetic disk or optical disk.

The above content is only the specific implementation of the application, but the scope of protection of the application is not limited thereto. Anyone familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the application, and should covered within the scope of protection of this application. Therefore, the protection scope of the present application should be determined by the protection scope of the claims.

Claims

An asymmetric transmission method, characterized in that the method comprises:

The station STA establishes a wireless fidelity Wi-Fi connection with the access point AP;

The STA sends an uplink data frame to the AP on an uplink resource unit through the Wi-Fi connection;

Wherein, the uplink resource unit includes a first resource unit and a second resource unit, or the uplink resource unit includes a second resource unit; the frequency of the second resource unit is lower than the frequency of the first resource unit; The first resource unit is used by the AP to send a downlink data frame to the STA.
The method according to claim 1, characterized in that,

The first resource unit belongs to a first channel, and the second resource unit belongs to a second channel;

Wherein, the first channel and the second channel both belong to the first frequency band; or, the first channel belongs to the first frequency band, the second channel belongs to the second frequency band, and the frequency of the second frequency band is lower than the frequency of the first frequency band.
The method according to claim 2, characterized in that,

The first frequency band includes a 6GHz frequency band, or a 5GHz frequency band, or a 2.4GHz frequency band;

The second frequency band includes a 6GHz frequency band, or a 5GHz frequency band, or a 2.4GHz frequency band.
The method according to any one of claims 1-3, wherein before the STA sends an uplink data frame to the AP on an uplink resource unit through the Wi-Fi connection, the method further includes :

The STA receives first indication information from the AP; wherein the first indication information is used to instruct the STA to perform asymmetric transmission;

The STA enables the asymmetric transmission function of the STA according to the first indication information.
The method according to claim 4, characterized in that,

The first indication information is also used to indicate the second resource unit; or,

The first indication information is also used to indicate the uplink resource unit.
The method according to any one of claims 1-5, wherein before the STA sends an uplink data frame to the AP on an uplink resource unit through the Wi-Fi connection, the method further includes :

The STA receives a downlink data frame from the AP on the first resource unit through the Wi-Fi connection; wherein the downlink data frame includes a first frame header, and the first frame header includes a channel number, sub-channel serial number;

The STA sends an uplink data frame on an uplink resource unit through the Wi-Fi connection, including: the STA transmits an uplink data frame on an uplink resource unit through the Wi-Fi connection according to the condition that the STA receives the downlink data frame The uplink data frame is sent on the unit; wherein, the uplink data frame includes a second frame header, and the second frame header includes the identifier of the uplink resource unit, the channel number, the starting sequence number, and the Bitmap Bitmap, so The Bitmap includes multiple bits corresponding to multiple downlink data frames, and each bit is used to indicate whether the downlink data frame corresponding to the bit is successfully received by the STA.
The method according to any one of claims 1-5, wherein the uplink data frame includes uplink service data generated by the STA; the uplink data frame further includes a first frame header, and the first frame The header includes channel number, sub-channel serial number;

After the STA transmits an uplink data frame to the AP on an uplink resource unit through the Wi-Fi connection, the method further includes: the STA receives a frame from the AP on the first resource unit The downlink data frame; wherein, the downlink data frame includes a second frame header, and the second frame header includes the identifier of the first resource unit, channel number, starting sequence number, and Bitmap, and the Bitmap includes multiple Multiple bits corresponding to uplink data frames, each bit is used to indicate whether the uplink data frame corresponding to the bit is successfully received by the AP.
An asymmetric transmission method, characterized in that the method comprises:

The access point AP establishes a wireless fidelity Wi-Fi connection with the station STA;

The AP receives an uplink data frame from the STA on an uplink resource unit through the Wi-Fi connection;

Wherein, the uplink resource unit includes a first resource unit and a second resource unit, or the uplink resource unit includes a second resource unit; the frequency of the second resource unit is lower than the frequency of the first resource unit; The first resource unit is used by the AP to send a downlink data frame to the STA.
The method according to claim 8, characterized in that,

The first resource unit belongs to a first channel, and the second resource unit belongs to a second channel;

Wherein, the first channel and the second channel both belong to the first frequency band; or, the first channel belongs to the first frequency band, the second channel belongs to the second frequency band, and the frequency of the second frequency band is lower than the frequency of the first frequency band.
The method according to claim 9, characterized in that,

The first frequency band includes a 6GHz frequency band, or a 5GHz frequency band, or a 2.4GHz frequency band;

The second frequency band includes a 6GHz frequency band, or a 5GHz frequency band, or a 2.4GHz frequency band.
According to the method according to any one of claims 8-10, before the AP receives the uplink data frame from the STA on the uplink resource unit through the Wi-Fi connection, it is characterized in that,

The AP sends first indication information to the first STA; where the first indication information is used to instruct the STA to perform asymmetric transmission.
The method according to claim 11, characterized in that,

The first indication information is also used to indicate the second resource unit; or,

The first indication information is also used to indicate the uplink resource unit.
The method according to any one of claims 8-12, wherein before the AP receives the uplink data frame from the STA on the uplink resource unit through the Wi-Fi connection, the method further include:

The AP sends a downlink data frame to the STA on the first resource unit through the Wi-Fi connection; wherein the downlink data frame includes a first frame header, and the first frame header includes a channel number , sub-channel serial number;

Wherein, the uplink data frame includes a second frame header, and the second frame header includes the identification of the uplink resource unit, the channel number, the starting sequence number, and a bitmap Bitmap, and the Bitmap includes a plurality of downlink A plurality of bits corresponding to the data frame, each bit is used to indicate whether the downlink data frame corresponding to the bit is successfully received by the STA.
The method according to claim 13, further comprising:

The AP determines the cumulative packet loss rate of downlink data frames according to the Bitmap;

Adjusting a downlink air interface rate for sending downlink data frames through the first resource unit according to the accumulated packet loss rate of the downlink data frames.
The method according to any one of claims 8-12, wherein the uplink data frame includes uplink service data generated by the STA; the uplink data frame further includes a first frame header, and the first frame The header includes channel number, sub-channel serial number;

After the AP receives the uplink data frame from the STA on the uplink resource unit through the Wi-Fi connection, the method further includes: the AP sends the STA to the STA on the first resource unit Sending a downlink data frame; wherein, the downlink data frame includes a second frame header, and the second frame header includes an identifier of the first resource unit, a channel number, a starting sequence number, and a Bitmap, and the Bitmap includes multiple Multiple bits corresponding to uplink data frames, each bit is used to indicate whether the uplink data frame corresponding to the bit is successfully received by the AP.
A station STA, characterized in that the STA includes: a processor, a memory, and a communication interface, the memory and the communication interface are coupled to the processor, the communication interface is used to communicate with other devices, the Other devices include an access point AP, the memory is used to store computer program codes, the computer program codes include computer instructions, and when the processor executes the computer instructions, the STA executes any of claims 1-7. one of the methods described.
An access point AP, characterized in that the AP includes: a processor, a memory, and a communication interface; the memory and the communication interface are coupled to the processor; the processor can provide A wireless fidelity Wi-Fi network; the memory is used to store computer program codes, the computer program codes include computer instructions; when the processor executes the computer instructions, the access point device executes the method according to claim 8 - the method described in any one of 15.
A computer-readable storage medium, characterized by comprising computer instructions, and when the computer instructions are run on a station STA, the STA executes the method according to any one of claims 1-7.
A computer-readable storage medium, characterized by comprising computer instructions, and when the computer instructions are run on an access point AP, the AP is made to execute the method according to any one of claims 8-15.
A computer program product, characterized in that, when the computer program product is run on a computer, the computer is made to execute the asymmetric transmission method according to any one of claims 1-15.
An asymmetric transmission system, characterized by comprising an access point AP and a station STA, the AP and the STA are used to implement the asymmetric transmission method according to any one of claims 1-15.