CN107431954A - Data transmission method and device - Google Patents

Abstract

Embodiments of the present invention provide a data transmission method and device, including: the AP receives the interference information received by the STA returned by the STA, and determines not to transmit data within the remaining interference time of the main interference source according to the interference information received by the STA, but to transmit data during the main interference source. Transmit data at a higher transmission rate after the remaining interference time of the interference source ends, or transmit data at a lower rate during the remaining interference time of the main interference source, and transmit data at a higher rate after the remaining interference time of the main interference source ends The transmission rate of data transmission can complete the transmission of the data to be sent faster, thereby improving the efficiency of data transmission and the utilization rate of wireless resources.

Description

Data transmission method and device technical field

Embodiments of the present invention relate to communication technologies, and in particular to a data transmission method and device.

Background technique

In recent years, wireless local area network (WLAN for short) has penetrated into people's daily life. WLAN mainly includes two network entities: access point (AP for short) and station (STA for short). The STA is the terminal device in the WLAN, and the AP is the relay node connecting the WLAN and the Internet, responsible for sending the data of the STA to the Internet, and also responsible for sending the data of the Internet to the STA. For downlink data transmission, when the AP transmits data to the STA, it needs to perform Clear Channel Assessment (CCA) first to determine whether the channel is idle. In the traditional system, the CCA threshold of the STA is equal to the receiving sensitivity (sensitivity level). If the received signal strength is higher than the CCA threshold, the STA determines that the channel is in a busy state, and if the received signal strength is lower than the CCA threshold, the STA determines that the signal is in an idle state. Due to the low CCA threshold, STAs often detect that the channel is busy, which inhibits concurrent transmission and makes the system space reuse efficiency low.

In order to solve the above problems, the current mainstream technical direction is to increase the CCA threshold, and the increased CCA threshold is greater than the receiving sensitivity. In the CCA process, as long as the strength of the received signal is less than the CCA threshold, the STA determines that the channel is idle, that is, the STA determines that the channel is idle in the following two cases: whether the strength of the received signal is less than the receiving sensitivity, or greater than the receiving sensitivity but less than the CCA threshold , STAs all determine that the channel is idle.

When the strength of the received signal is greater than the receiving sensitivity but less than the CCA threshold, the STA is actually interfered. Because the STA is affected by the interference, the AP can only transmit data to the STA at a lower rate, and the low rate transmission will occupy more Air interface resources, in addition, after the interference ends, the interference received by the STA is reduced, and the transmission from the AP can be accepted at a higher rate, but the AP still transmits at a low rate, which is a waste of resources.

Contents of the invention

Embodiments of the present invention provide a data transmission method and device, which improve the efficiency of data transmission and the utilization rate of wireless resources.

The first aspect of the present invention provides a data transmission method, including:

The AP sends a data transmission indication message to the STA on the channel, the data transmission indication message is used to notify the STA that the AP has data to send to the STA, and the data transmission indication message includes the identity of the STA and the The time during which the AP sends data to the STA and occupies the channel;

The AP receives the free channel assessment CCA report of the channel returned by the STA according to the data transmission indication message, and the CCA report includes: N interference source identities, each interference source in the N interference source The generated interference intensity, the remaining interference time of each interference source, and the interference intensity of the internal interference of the channel, the interference intensity of the internal interference refers to the interference of the channel after the interference generated by the N interference sources The interference intensity of , N is a positive integer greater than or equal to 1;

The AP determines N1 main interference sources and N2 secondary interference sources from the N interference sources according to the interference strengths of the N interference sources, and the main interference sources are the N interference sources An interference source with a greater interference intensity, the secondary interference source is an interference source with a smaller interference intensity among the N interference sources, N1 is a positive integer greater than or equal to 1, and N2 is a positive integer greater than or equal to 0, N=N1+N2;

The AP calculates, according to the obtained signal strength on the channel, the interference strength of the N interference sources, and the interference strength of the internal interference, that the AP is at the same time as the N interference sources and the internal interference. A first transmission rate used to transmit the data to be sent if present;

According to the signal strength, the interference strength of the N2 secondary interference sources, and the interference strength of the internal interference, the AP calculates when the N2 secondary interference sources and the internal interference exist simultaneously a second transmission rate used for transmitting the data to be sent;

The AP transmits the to-be-sent data to the STA on the channel according to the first transmission rate, the second transmission rate, and the remaining interference time of the N1 main interference sources, and the to-be-sent data The data transmission time is less than the data transmission time of the STA when the interference of the N interference sources exists Describes the transmission time required for the data to be sent.

With reference to the first aspect, in a first possible implementation manner of the first aspect, the AP, according to the first transmission rate, the second transmission rate, and the remaining interference time of the N1 main interference sources, Transmitting the data to be sent to the STA on the channel includes:

The AP calculates a first transmission time according to the size of the data to be sent and the first transmission rate;

The AP calculates a second transmission time according to the size of the data to be sent and the second transmission rate;

If the first transmission time is greater than the sum of the second transmission time and the maximum remaining interference time of the N1 main interference sources, the AP , using the second transmission rate to transmit the data to be sent to the STA on the channel.

With reference to the first possible implementation of the first aspect, in a second possible implementation of the first aspect, the method further includes:

The AP uses the first transmission rate to send data to other STAs on the channel before the maximum remaining interference time of the N1 main interference source ends.

With reference to the first aspect, in a third possible implementation manner of the first aspect, the AP, according to the first transmission rate, the second transmission rate, and the remaining interference time of the N1 main interference sources, Transmitting the data to be sent to the STA on the channel includes:

The AP divides the data to be sent into a first sub-data segment and a second sub-data segment, and the first sub-data segment is transmitted before the second sub-data segment;

The AP transmits the first sub-data segment to the STA on the channel by using the first transmission rate, and the AP transmits the sub-data segment to the STA on the channel by using the second transmission rate. The second sub-data segment.

With reference to the third possible implementation of the first aspect, in a fourth possible implementation of the first aspect, the AP divides the data to be sent into a first sub-data segment and a second sub-data segment, include:

According to the first transmission rate and the maximum residual interference of the N1 main interference sources, the AP Calculating the size of the data that can be transmitted within the maximum remaining interference time of the N1 main interference sources according to the interference time;

The AP divides the data to be sent into the first sub-data segment and the second sub-data segment according to the size of the data that the AP can transmit within the maximum remaining interference time of the N1 main interference sources , the size of the first sub-data segment is greater than or equal to the size of data that the AP can transmit within the maximum remaining interference time of the N1 main interference sources.

With reference to the first aspect and any one of the first to fourth possible implementations of the first aspect, in a fifth possible implementation of the first aspect, the AP according to the acquired signal strength, The interference strength of the N interference sources and the interference strength of the internal interference, calculating the first transmission rate used by the AP to transmit the data to be sent when the N interference sources and the internal interference exist simultaneously, include:

The AP calculates the first transmission rate according to a first formula, and the first formula is: Wherein, _R represents the _first transmission rate, S represents the signal strength, I represents the interference strength of the _ith main interference source, and I represents the interference strength of the internal interference;

According to the signal strength, the interference strength of the N2 secondary interference sources, and the interference strength of the internal interference, the AP calculates when the N2 secondary interference sources and the internal interference exist simultaneously The second transmission rate used for transmitting the data to be sent includes:

The AP calculates the second transmission rate according to a second formula, and the second calculation formula is: Wherein, R ₂ represents the second transmission rate, and I _j represents the interference intensity of the jth secondary interference source.

In combination with the first aspect and any one of the first to fifth possible implementations of the first aspect, in a sixth possible implementation of the first aspect, the method further includes:

The AP obtains the signal strength according to the received power obtained when receiving the CCA report;

Alternatively, the AP receives the signal strength sent by the STA, where the signal strength is obtained by the STA according to the received power obtained when receiving the data transmission indication message.

With reference to the first aspect and any one of the first to sixth possible implementations of the first aspect, in a seventh possible implementation of the first aspect, the STA sends the The time taken by the CCA report is equal to the time taken by the STA to send a clear to send CTS message to the AP.

With reference to the first aspect, in an eighth possible implementation manner of the first aspect, the data transmission indication message further includes: clear to send CTS message indication information, the indication information is used to indicate whether the STA sends the The AP returns a CTS message.

A second aspect of the present invention provides a data transmission method, including:

The STA receives a data transmission indication message sent by the AP on the channel, the data transmission indication message is used to notify the STA that the AP has data to send to the STA, and the data transmission indication message includes the STA's identity and The time during which the AP sends data to the STA and occupies the channel;

The STA obtains the free channel assessment CCA information of the channel according to the data transmission indication message, and the CCA information is used to indicate that the channel is idle, the channel is busy, or the channel is interfered;

If the CCA information indicates that the channel is interfered, the STA sends the CCA report to the AP, so that the AP transmits the data to be sent to the STA according to the CCA report, and the CCA report includes : the identification of N interference sources, the interference intensity generated by each interference source in the N interference sources, the remaining interference time of each interference source, and the interference intensity of internal interference of the channel, and the interference intensity of the internal interference The interference intensity refers to the interference intensity received by the channel after the interference generated by the N interference sources ends, and N is a positive integer greater than or equal to 1.

With reference to the second aspect, in a first possible implementation manner of the second aspect, before the STA sends the CCA report to the AP, the method further includes:

The STA determines whether the time for the AP to send data to the STA and occupy the channel included in the data transmission indication message is greater than a preset time threshold;

If the AP included in the data transmission indication message sends the STA the data occupation If the time of the channel is greater than the time threshold, the STA determines to send the CCA report to the AP;

If the time that the AP sends data to the STA and occupies the channel included in the data transmission indication message is less than or equal to the time threshold, the STA determines to return a clear to send CTS message to the AP.

With reference to the second aspect, in a second possible implementation manner of the second aspect, the data transmission indication message further includes: clear to send CTS message indication information, the indication information is used to indicate whether the STA sends the The AP returns a CTS message;

If the indication information is used to instruct the STA to return a CTS message to the AP, the method further includes:

The STA sends a CTS message to the AP before or after sending the CCA report to the AP.

A third aspect of the present invention provides an AP, including:

A sending module, configured to send a data transmission instruction message to the station STA on a channel, the data transmission instruction message is used to notify the STA that the AP has data to send to the STA, and the data transmission instruction message includes the The identity of the STA and the time when the AP sends data to the STA and occupies the channel;

A receiving module, configured to receive a free channel assessment CCA report of the channel returned by the STA according to the data transmission indication message, the CCA report includes: N interference source identities, each of the N interference sources The interference strength generated by the interference source, the remaining interference time of each interference source, and the interference strength of the internal interference of the channel, the interference strength of the internal interference refers to the The intensity of interference received by the channel, N is a positive integer greater than or equal to 1;

A processing module, configured to determine N1 main interference sources and N2 secondary interference sources from the N interference sources according to the interference strength of the N interference sources, the main interference sources being the N interference sources Among the sources, the interference source with greater interference intensity, the secondary interference source is the interference source with smaller interference intensity among the N interference sources, N1 is a positive integer greater than or equal to 1, and N2 is a positive integer greater than or equal to 0 Integer, N=N1+N2;

The processing module is further configured to calculate, according to the acquired signal strength on the channel, the interference strength of the N interference sources, and the interference strength of the internal interference, the AP's The first transmission rate used to transmit the data to be sent when the internal interference exists at the same time;

The processing module is further configured to calculate, according to the signal strength, the interference strength of the N2 secondary interference sources, and the interference strength of the internal interference, whether the AP is in the N2 secondary interference sources and the A second transmission rate used to transmit the data to be sent when internal interference exists at the same time;

The processing module is further configured to transmit the data to be sent to the STA on the channel according to the first transmission rate, the second transmission rate, and the remaining interference time of the N1 main interference sources , the transmission time of the data to be sent is less than the transmission time required by the STA to transmit the data to be sent when interference from the N interference sources exists.

With reference to the third aspect, in a first possible implementation manner of the third aspect, the processing module, according to the first transmission rate, the second transmission rate, and the remaining interference time of the N1 main interference sources, transmitting the data to be sent to the STA on the channel, specifically:

calculating a first transmission time according to the size of the data to be sent and the first transmission rate;

calculating a second transmission time according to the size of the data to be sent and the second transmission rate;

If the first transmission time is greater than the sum of the second transmission time and the maximum remaining interference time of the N1 main interference sources, after the maximum remaining interference duration of the N1 main interference sources ends, in the transmit the data to be sent to the STA by using the second transmission rate on the channel.

With reference to the first possible implementation of the third aspect, in a second possible implementation of the third aspect, the sending module is further configured to:

Before the maximum remaining interference time of the N1 main interference source ends, send data to other STAs on the channel by using the first transmission rate.

With reference to the third aspect, in a third possible implementation manner of the third aspect, the processing module, according to the first transmission rate, the second transmission rate, and the remaining interference time of the N1 main interference sources, transmitting the data to be sent to the STA on the channel, specifically:

dividing the data to be sent into a first sub-data segment and a second sub-data segment, the first sub-data segment being transmitted before the second sub-data segment;

transmitting the first sub-data segment to the STA on the channel by using the first transmission rate, and transmitting the second sub-data segment to the STA on the channel by using the second transmission rate.

With reference to the third possible implementation of the third aspect, in a fourth possible implementation of the third aspect, the processing module divides the data to be sent into a first sub-data segment and a second sub-data segment ,Specifically:

Calculate the size of data that can be transmitted within the maximum remaining interference time of the N1 main interference sources according to the first transmission rate and the maximum remaining interference time of the N1 main interference sources;

According to the size of the data that can be transmitted within the maximum remaining interference time of the N1 main interference sources, the data to be sent is divided into the first sub-data segment and the second sub-data segment, the first sub-data The size of the segment is greater than or equal to the size of data that the AP can transmit within the maximum remaining interference time of the N1 main interference sources.

With reference to the third aspect and any one of the first to fourth possible implementations of the third aspect, in a fifth possible implementation of the third aspect, the processing module according to the acquired signal strength , the interference strength of the N interference sources and the interference strength of the internal interference, and calculate the first transmission rate used by the AP to transmit the data to be sent when the N interference sources and the internal interference coexist ,Specifically:

Calculate the first transmission rate according to a first formula, where the first formula is: Wherein, _R represents the _first transmission rate, S represents the signal strength, I represents the interference strength of the _ith main interference source, and I represents the interference strength of the internal interference;

The processing module according to the signal strength, the interference strength of the N2 secondary interference sources and the interference intensity of the internal interference, calculating the second transmission rate used by the AP to transmit the data to be sent when the N2 secondary interference sources and the internal interference exist simultaneously, specifically:

Calculate the second transmission rate according to a second formula, where the second calculation formula is: Wherein, R ₂ represents the second transmission rate, and I _j represents the interference intensity of the jth secondary interference source.

In combination with the third aspect and any one of the first to fifth possible implementation manners of the third aspect, in a sixth possible implementation manner of the third aspect, the receiving module is further configured to:

obtaining the signal strength according to the received power obtained when receiving the CCA report;

Or, receive the signal strength sent by the STA, where the signal strength is obtained by the STA according to the received power obtained when receiving the data transmission indication message.

With reference to the third aspect and any one of the first to sixth possible implementation manners of the third aspect, in a seventh possible implementation manner of the third aspect, the STA sends the The time taken by the CCA report is equal to the time taken by the STA to send a clear to send CTS message to the AP.

With reference to the third aspect, in an eighth possible implementation manner of the third aspect, the data transmission indication message further includes: clear to send CTS message indication information, the indication information is used to indicate whether the STA sends the The AP returns a CTS message.

A fourth aspect of the present invention provides an STA, including:

The receiving module is configured to receive a data transmission instruction message sent by the access point AP on a channel, the data transmission instruction message is used to notify the STA that the AP has data to send to the STA, and the data transmission instruction message contains Including the identity of the STA and the time when the AP sends data to the STA and occupies the channel;

An acquiring module, configured to acquire free channel assessment CCA information of the channel according to the data transmission indication message, where the CCA information is used to indicate that the channel is idle, the channel is busy, or or said channel is disturbed;

A sending module, configured to send the CCA report to the AP if the CCA information indicates that the channel is interfered, so that the AP transmits the data to be sent to the STA according to the CCA report, and the CCA The report includes: the identification of N interference sources, the interference intensity generated by each interference source in the N interference sources, the remaining interference time of each interference source, and the interference intensity of internal interference of the channel, the internal The interference intensity of interference refers to the interference intensity received by the channel after the interference generated by the N interference sources ends, and N is a positive integer greater than or equal to 1.

In combination with the fourth aspect, in the first possible implementation manner of the fourth aspect, it also includes:

A determining module, configured to determine whether the time that the AP sends data to the STA and occupies the channel included in the data transmission indication message is greater than a preset time before the sending module sends the CCA report to the AP time threshold;

If the time that the AP sends data to the STA and occupies the channel included in the data transmission indication message is greater than the time threshold, determine to send the CCA report to the AP;

If the time that the AP sends data to the STA and occupies the channel included in the data transmission indication message is less than or equal to the time threshold, determine to return a clear to send CTS message to the AP.

With reference to the fourth aspect, in a second possible implementation manner of the fourth aspect, the data transmission indication message further includes: clear to send CTS message indication information, the indication information is used to indicate whether the STA sends the The AP returns a CTS message;

If the indication information is used to instruct the STA to return a CTS message to the AP, the sending module is further configured to:

Sending a CTS message to the AP before or after sending the CCA report to the AP.

The fifth aspect of the present invention provides an AP, including: a processor, a memory, a communication interface, and a system bus. The memory and the communication interface are connected to the processor through the system bus and complete mutual communication. The memory is used to store computer-executed instructions, the communication interface is used to communicate with other devices, and the processor is used to run the computer-executed instructions command to make the AP execute the method according to the first aspect and any one of the first to eighth possible implementation manners of the first aspect.

The sixth aspect of the present invention provides an STA, including: a processor, a memory, a communication interface, and a system bus. The memory and the communication interface are connected to the processor through the system bus and complete mutual communication. The memory is used to store computer-executable instructions, the communication interface is used to communicate with other devices, and the processor is used to run the computer-executable instructions so that the STA performs the first and second aspects of the first aspect and the second aspect. Any one of the methods described in the second possible implementation manner.

In the data transmission method and device provided by the embodiments of the present invention, the AP receives the CCA report of the channel returned by the STA, and the CCA report includes: the identification of the main interference source, the interference intensity of the main interference source, the remaining duration of interference of the main interference source, and others Interference strength, the AP makes data transmission decisions based on the interference received by the STA. When the STA is subject to strong interference, the transmission time of the data to be sent is less than the transmission time required by the STA to transmit the data to be sent under the interference of the main interference source, and the transmission of the data to be sent can be completed faster, thereby improving data transmission. The efficiency improves the utilization rate of wireless resources.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained according to these drawings without any creative effort.

FIG. 1 is a schematic diagram of a WLAN network;

Fig. 2 is a schematic diagram of the corresponding relationship between the CCA threshold and the execution action;

FIG. 3 is a flowchart of a data transmission method provided by Embodiment 1 of the present invention;

FIG. 4 is a flowchart of a data transmission method provided by Embodiment 2 of the present invention;

FIG. 5 is a flowchart of a data transmission method provided by Embodiment 3 of the present invention;

FIG. 6 is a schematic diagram of a scene applicable to Embodiment 3 of the present invention;

FIG. 7 is a schematic diagram of data transmission using a method in the prior art;

FIG. 8 is a schematic diagram of data transmission using the method of Embodiment 3;

FIG. 9 is a schematic structural diagram of a method provided in Embodiment 4 of the present invention;

FIG. 10 is a schematic diagram of data transmission using the method of Embodiment 4;

FIG. 11 is a schematic diagram of multiple STAs sending data transmission response messages to the AP;

FIG. 12 is another schematic diagram of multiple STAs sending data transmission response messages to the AP;

FIG. 13 is a schematic diagram of multiple STAs sending data transmission response messages to the AP;

FIG. 14 is a schematic structural diagram of an AP provided in Embodiment 5 of the present invention;

FIG. 15 is a schematic structural diagram of an STA provided in Embodiment 8 of the present invention;

FIG. 16 is a schematic structural diagram of an AP provided by Embodiment 9 of the present invention;

FIG. 17 is a schematic structural diagram of an STA provided in Embodiment 10 of the present invention.

detailed description

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

The method of the embodiment of the present invention can be applied in a densely deployed WLAN. FIG. 1 is a schematic diagram of a WLAN network. As shown in FIG. 1, there are two Basic Service Sets (BSS for short) in the figure: BSS1 and BSS2 , a BSS consists of an AP and multiple STAs associated with the AP. Usually, STAs within the wireless signal coverage of the AP are associated with the AP. In practical applications, it is common for multiple BSSs to overlap in coverage area, thus forming an overlapping BSS (Overlapping BSS, OBSS for short). STA1 is in the OBSS. Assuming that AP2 seizes the channel first, if the strength of the data sent by AP when it reaches STA1 exceeds the Receiver Sensitivity Level of STA1, STA1 should be able to successfully receive AP2 to associate with it with a high probability. The data packet sent by the STA, and set the network allocation vector (Network Allocation Vector, referred to as NAV) according to the packet header information, such as the Length information or media access control in the Session Initiation Protocol (Session Initiation Protocol, referred to as SIG) protocol (Media Access Control, referred to as MAC) protocol Duration information.

The NAV itself is a timer (timer), which is used to indicate the time for the AP2 to send data to the STA1 to occupy the channel. After STA1 sets NAV according to the data packet sent by AP2, STA1 will not be allowed to access the channel before the NAV time expires. In a WLAN, before the AP needs to send downlink data to the STA it serves, the AP will send a Request To Send (RTS) message to the STA. After receiving the Clear To Send (Clear To Send, After the CTS) message, the AP can send data. In Figure 1, if AP1 intends to initiate data transmission to STA1, AP1 transmits an RTS message to STA, but STA1 cannot return a CTS message to AP1 due to NAV restrictions. AP1 does not receive the CTS message sent by STA1, and will try to send it with a short packet The mechanism retransmits the RTS message, but because STA1 cannot respond, air interface resources are wasted.

The current mainstream technology is to increase the threshold level of CCA. The increased CCA threshold P_CCA>P_sensitivity, P_sensitivity indicates the receiving sensitivity of the STA. Figure 2 is a schematic diagram of the corresponding relationship between the CCA threshold and the execution action. As shown in Figure 2, taking STA1 as an example, if the received power of the data packet sent by AP2 received by STA1 is P_packet, and P_packet<P_CCA, then STA1 After determining that the channel is idle, STA1 returns a CTS message to AP1. When P_packet>P_CCA, because the receiving power of STA1 is higher than the CCA threshold, STA1 determines that the channel is busy, and STA1 does not return a CTS message to AP1. When P_sensitivity<P_packet<P_CCA, STA1 determines that the channel is free and available, and STA1 returns a CTS message to AP1. Since STA1’s receiving power is higher than its own receiving sensitivity, STA1 has a higher probability of being able to decode the packet header information sent by AP2. Then, set the NAV time according to the packet header information. At the same time, the packet header of the data packet sent by AP2 also contains BSS color information or the identity of the BSS (Identity, ID for short), to inform STA1 which BSS the data packet comes from, and select P_CCA according to the information in the packet header.

It can be known from the above description that in the prior art, as long as P_packet<P_CCA, STA1 can send a CTS reply to AP1, and AP1 can send data to STA1. Since STA1 is affected by the interference of AP2, AP1 can only transmit to STA1 at a lower rate. . In this case, low-rate transmissions will occupy more air interface resources. In addition, after the data transmission of AP2 ends, STA1 receives less interference and can receive higher-rate transmissions from AP1. However, in the prior art, AP1 still Transmission at a low rate results in a waste of resources.

In order to solve the problems in the prior art, Embodiment 1 of the present invention provides a data transmission method. FIG. 3 is a flow chart of the data transmission method provided in Embodiment 1 of the present invention. As shown in FIG. 3 , the method provided in this embodiment can Include the following steps:

Step 101, the AP sends a data transmission indication message to the STA on the channel, and the data transmission indication message is used to notify the STA that the AP has data to send to the STA, and the data transmission indication message includes the identification of the STA and the information that the AP sends data to the STA to occupy the channel time.

The data transmission instruction message may adopt a newly defined message form, or may adopt an existing message form, for example, an RTS message. The AP may carry the STA identifier and the required time in the data transmission message. When the data transmission indication message is an RTS message, the required transmission time included in the data transmission indication message may specifically be NAV.

Step 102. The AP receives the CCA report of the channel returned by the STA according to the data transmission instruction message. The CCA report includes: the identification of N interference sources, the interference intensity generated by each interference source among the N interference sources, and the interference intensity of each interference source. The remaining interference time of the source and the interference intensity of the internal interference of the channel. The interference intensity of the internal interference refers to the interference intensity of the channel after the interference generated by N interference sources ends, and N is a positive integer greater than or equal to 1.

The AP will broadcast the data transmission instruction message in the form of broadcast, and all STAs in the BSS to which the AP belongs may receive the data transmission message. For a certain STA, after receiving the data transmission instruction message, the STA will Determine whether the identifier of the STA included in the data transmission indication message is its own identifier. If the STA identifier included in the data transmission indication message is the STA identifier, the STA acquires the CCA information of the channel. If the STA identity included in the data transmission indication message is the identity of another STA, the STA parses the data transmission indication message to obtain the time required for the AP to send data to the STA included in the data transmission indication message.

After determining that the STA identifier included in the data transmission indication message RTS message is its own identifier, the STA queries the CCA information of the channel, and the CCA information is obtained by the STA in advance. In this embodiment, the CCA information can indicate that the channel is idle, the channel is busy, and the channel is interfered. Wherein, when the CCA information indicates that the channel is interfered, the CCA report includes: the identifiers of N interference sources, the number of each interference source in the N interference sources The resulting interference strength, the remaining interference time of each interferer, and the interference strength of the channel's internal interference. If the CCA information indicates that the channel is busy, the STA No data transmission response message is returned to the AP, that is, no message is returned to the AP. If the CCA information indicates that the channel is idle or interfered, the STA returns a data transmission response message to the AP. Specifically, if the channel is idle, the data transmission response message is a CTS message. After receiving the CTS message, the AP starts transmission after one SIFS Data, where SIFS (Short interframe space, SIFS for short) means a short interframe space. If the channel is interfered, the data transmission response message includes a CCA report, or includes a CCA report and a CTS message, and the interference received by the STA is sent to the AP by returning the CCA report.

It should be noted that the STA may send the CTS message to the AP before sending the CCA report, or may send the CTS message after sending the CCA report. Whether the STA returns an RTS message to the AP after receiving the data transmission indication message can be configured by the AP. For example, the AP carries the indication information of the CTS message in the data transmission indication message, and the indication information is used to indicate whether the STA returns a CTS message to the AP. . For example, the AP may carry the indication information through a bit. For example, a bit value of 1 indicates that the STA returns a CTS message to the AP, a bit value of 0 indicates that the STA does not return a CTS message to the AP, or a bit value of A value of 1 indicates that the STA does not return a CTS message to the AP, and a bit value of 0 indicates that the STA returns a CTS message to the AP.

For STA1, it may be interfered by multiple interference sources, so STA1 needs to report the interference intensity of each interference source to the AP. For example, STA1 has one interference source, then the CCA message reported by STA1 is in the form of: the identifier of interference source 1, the interference intensity of interference source 1, the remaining interference time of interference source 1, and the interference intensity of internal interference. If STA1 has two interference sources, the form of the CCA message reported by STA1 is: the identity of interference source 1, the interference intensity of interference source 1, the remaining interference time of interference source 1, the identity of interference source 2, the interference of interference source 2 Intensity, remaining interference time of interference source 2, and interference intensity of internal interference.

Taking the example shown in Figure 1 as an example, STA1 obtains CCA information mainly through the following methods. If STA1 receives the received power of the RTS message sent by AP2 P_packet<P_CCA, STA1 determines that the channel is idle, and if P_packet>P_CCA, STA1 determines that the channel is busy , if P_sensitivity<P_packet<P_CCA, then STA1 determines that the channel is interfered, STA1 parses the RTS message, and obtains that the RTS message comes from AP2 through the header information, then determines that the interference source is AP2, and obtains NAV2 from the RTS message, NAV2 indicates that AP2 is occupied The maximum time of the channel For STA1, NAV2 is the total interference time of the interference source AP2, P_packet is the interference intensity of the interference source AP2, and the time of NAV2 gradually decreases to 0 with the transmission of data. After receiving the RTS message sent by AP1, STA1 queries the CCA information to obtain the identity of the interference source AP2, the interference intensity of the interference source AP2, the remaining interference time of the interference source AP2, and the interference intensity of the internal interference of the channel. Interference time is the remaining time of NAV2.

If the CCA information indicates that the channel is interfered, the STA may determine whether to send a CCA report to the AP according to the time that the AP sends data to the STA and occupies the channel included in the data transmission indication message. In one way, regardless of the length of time that the AP included in the data transmission indication message sends data to the STA to occupy the channel, the STA will return a CCA report to the AP. In the other way, only the AP included in the data transmission indication message sends the STA a The STA sends a CCA report to the AP only when the time occupied by the channel for sending data is longer than the preset time threshold. This is mainly because, if the time occupied by the AP to send data to the STA in the data transmission instruction message is less than or equal to the time threshold, it means that the time required for the AP to send data to the STA is very short, so even if there is an interference source, the AP will Sending data to STA at a slower rate will not occupy too many resources. If the STA sends a CCA report to the AP, some resources will be occupied by sending the CCA report. Even if a certain amount of transmission resources are reduced according to the reported interference information, plus the resources occupied by sending the CCA report, the total resources consumed by the two methods Almost, therefore, the STA does not need to send the CCA report to the AP.

Preferably, the time taken by the STA to send the CCA report to the AP is equal to the time taken by the STA to send the CTS message to the AP in the prior art, so as to ensure that the AP can initiate the transmission within SIFS*2+CTS time after the RTS message transmission ends .

Step 103, the AP determines N1 main interference sources and N2 secondary interference sources from the N interference sources according to the interference strength of the N interference sources, and the main interference source is an interference source with a higher interference intensity among the N interference sources, The secondary interference source is an interference source with a smaller interference intensity among the N interference sources, N1 is a positive integer greater than or equal to 1, N2 is a positive integer greater than or equal to 0, and N=N1+N2.

For example, there are three interference sources. The interference intensity of interference source 1 and interference source 2 is relatively large, which has a greater impact on the data transmission of STAs. The interference intensity of interference source 3 is relatively small, and has a small impact on STA data transmission. Determine that interference source 1 and interference source 2 are the main interference sources, and interference source 3 is the secondary interference source. If there is only one interference source, then this one interference source is regarded as the main interference source, and the count is zero.

Step 104, the AP calculates the first transmission used by the AP to transmit the data to be sent when the N interference sources and the internal interference exist simultaneously according to the acquired signal strength on the channel, the interference strength of the N interference sources, and the interference strength of the internal interference rate.

Specifically, the AP may calculate the first transmission rate according to the first formula, and the first formula is: Among them, R ₁ represents the first transmission rate, S represents the signal strength, I _i represents the interference strength of the i-th main interference source, and I _r represents the interference strength of the internal interference. Alternatively, the AP may also calculate the first transmission rate by using a physical layer abstraction method or other methods according to the signal strength, the interference strength of the N interference sources, and the interference strength of internal interference.

Specifically, the AP can obtain the signal strength in the following ways: the AP obtains the signal strength according to the received power obtained when receiving the CCA report; or, the AP receives the signal strength sent by the STA, which is the received power obtained by the STA when receiving the data transmission instruction message owned.

Step 105, the AP calculates the second transmission rate used by the AP to transmit the data to be sent when the N2 secondary interference sources and the internal interference exist simultaneously according to the signal strength, the interference strength of the N2 secondary interference sources, and the interference strength of the internal interference.

The second transmission rate is the rate after the interference of the main interference source ends. Specifically, the AP can calculate the second transmission rate according to the second formula, and the second calculation formula is: Wherein, R ₂ represents the second transmission rate, and I _j represents the interference intensity of the jth secondary interference source. Alternatively, the AP may also calculate the second transmission rate by using a physical layer abstraction method or other methods according to the obtained signal strength and the interference strength of the N2 secondary interference sources.

Step 106: The AP transmits the data to be sent to the STA on the channel according to the first transmission rate, the second transmission rate and the remaining interference time of the N1 main interference sources, and the transmission time of the data to be sent is less than the interference of the STA in the N interference sources The transmission time required to transmit the data to be sent, if present.

In the first way, the AP calculates the first transmission time according to the size of the data to be sent and the first transmission rate, and the first transmission time is the transmission time required for the STA to transmit the data to be sent when it is interfered by the main interference source. And calculating a second transmission time according to the size of the data to be sent and the second transmission rate, where the second transmission time is the transmission time required by the STA to transmit the data to be sent without being interfered by the main interference source. Finally, the sum of the maximum remaining interference time of the second transmission time and the N1 main interference sources is calculated. For example, there are two main interference sources, the remaining interference time of main interference source 1 is 1ms, and the remaining interference time of main interference source 2 is 1.5ms, then the maximum remaining interference time of main interference sources 1 and 2 is 1.5ms.

If the first transmission time is greater than the sum of the second transmission time and the maximum remaining interference time of the N1 main interference sources, the AP uses the second transmission rate on the channel after the maximum remaining interference duration of the N1 main interference sources ends. The STA transmits the data to be sent. If the first transmission time is less than or equal to the sum of the second transmission time and the remaining interference duration of the main interference source, the AP uses the first transmission immediately after receiving the CCA report, or after receiving the CCA report and the CTS message. The rate at which data to be sent is transmitted to the STA. If the first transmission time is less than or equal to the sum of the second transmission time and the maximum remaining interference time of the N1 main interference sources, it means that after receiving the CCA report, the AP uses the first The transmission rate starts to transmit the data to be sent, and the transmission can be completed earlier than delaying the transmission of the data to be sent after the end of the maximum remaining interference time of the N1 main interference sources.

In the first method, the AP transmits data at the second transmission rate after the maximum remaining interference time of the N1 main interference sources, which can complete the transmission of the data to be sent faster, thereby improving the efficiency of data transmission and improving wireless communication efficiency. resource utilization. Further, in order to improve the utilization rate of wireless resources, the AP uses the first transmission rate to send data to other STAs on the channel before the maximum remaining interference time of the N1 main interference sources ends.

In the second way, the AP divides the data to be sent into the first sub-data segment and the second sub-data segment. The first sub-data segment is transmitted before the second sub-data segment. The STA sends the first sub-data segment, and the AP uses the second transmission rate to send the second sub-data segment to the STA on the channel.

Preferably, the transmission time of the first sub-data segment is greater than or equal to the maximum of the N1 main interference sources Large remaining interference time, that is, before the end of the maximum remaining interference time of the N1 main interference sources, the AP uses the lower first transmission rate for transmission, and after the end of the maximum remaining interference time of the N1 main interference sources, the AP uses a faster transmission rate. The second transmission rate transmits data. Since the transmission of the second sub-data segment uses the second transmission rate, compared with the prior art, the data to be sent can only be transmitted at the first transmission rate, and the AP can complete the transmission of the data to be sent faster, thus improving the data rate. The efficiency of transmission improves the utilization rate of wireless resources. Correspondingly, when the AP divides the data to be sent into the first sub-data segment and the second sub-data segment: the AP calculates the maximum remaining The size of the data that can be sent within the interference time. According to the size of the data that can be sent by the AP within the maximum remaining interference time of the N1 main interference sources, the data to be sent is divided into a first sub-data segment and a second sub-data segment. The first The size of the sub-data segment is greater than or equal to the size of the data that the AP can send within the maximum remaining interference time of the N1 main interference sources.

In this embodiment, the AP receives the CCA report of the channel returned by the STA, and the CCA report includes: the interference intensity generated by each interference source among the N interference sources, the remaining interference time of each interference source, and the interference intensity of the internal interference of the channel ; According to the CCA report, calculate the first transmission rate used by the STA when it is interfered by N1 main interference sources, and the second transmission rate used by the STA when it is not interfered by N1 main interference sources, according to the first transmission rate , the second transmission rate and the remaining interference time of the N1 main interference sources, transmit the data to be sent to the STA on the channel, and the transmission time of the data to be sent is less than the transmission required for the STA to transmit the data to be sent when it is interfered by the N1 main interference sources time. In the method, the AP performs data transmission according to the interference received by the STA, so that the transmission time of the data to be sent is shorter than the transmission time required by the STA to transmit the data to be sent under the interference of the main interference source, and the data to be sent can be completed faster. Data transmission, thereby improving the efficiency of data transmission and improving the utilization rate of wireless resources.

FIG. 4 is a flowchart of a data transmission method provided by Embodiment 2 of the present invention. This embodiment is described from the STA side. As shown in FIG. 4, the method of this embodiment may include the following steps:

Step 201, STA receives the data transmission indication message that AP sends on the channel, and this data transmission indication message is used for notifying STA that AP has data to send to STA, and the data transmission indication message includes Including the STA's identity and the time when the AP sends data to the STA and occupies the channel.

Step 202, the STA acquires CCA information of the channel according to the data transmission indication message, and the CCA information is used to indicate that the channel is idle, the channel is busy, or the channel is interfered.

Step 203: If the CCA information indicates that the channel is interfered, the STA sends a CCA report to the AP, so that the AP transmits the data to be sent to the STA according to the CCA report. The CCA report includes: the identification of N interference sources, each of the N interference sources The interference intensity generated by the interference source, the remaining interference time of each interference source, and the interference intensity of the internal interference of the channel. The interference intensity of the internal interference refers to the interference intensity of the channel after the interference generated by N interference sources ends, and N is greater than or A positive integer equal to 1.

If the CCA information is used to indicate that the channel is idle, the STA only returns a CTS message to the AP; if the CCA information is used to indicate that the channel is busy, the STA does not return any message to the AP.

Optionally, before the STA sends the CCA report to the AP, the STA determines whether the time required for the AP to send data to itself carried in the data transmission indication message is greater than the preset time threshold; if the time required for the AP to send data to itself is greater than the If the time threshold is set, the STA sends a CCA report to the AP; if the time required for the AP to send data to itself is less than or equal to the time threshold, the STA does not return a CTS message to the AP. The main reason is that when the NAV is very small, the transmission time for the AP to transmit data to the STA is very short. Even in the case of interference, low-speed transmission will not take up too much resources. However, uploading the CCA status will also take up resources. , but reduces resource utilization.

For the specific implementation manner of this embodiment, reference may be made to the relevant description of step 102 in the first embodiment, and details are not repeated here.

In this embodiment, when the STA determines that the channel is interfered with according to the CCA information, the STA returns a CCA report to the AP, and the CCA report carries information about the interference received by the STA, so that the AP performs data transmission according to the interference received by the STA.

The methods of Embodiment 1 and Embodiment 2 will be described below through specific examples. This embodiment is described by taking the scenario shown in FIG. 1 as an example. FIG. 5 is a flowchart of a data transmission method provided by Embodiment 3 of the present invention. FIG. 6 is a schematic diagram of a scenario applicable to Embodiment 3 of the present invention. FIG. 6 There are two BSSs: BSS1 and BSS2, AP2 in BSS2 sending data to STA2 will cause interference to STA1 in BSS1, please combine Figure 5 and Figure 6, the method provided in this embodiment may include the following steps:

Step 301, AP1 performs channel competition.

In step 302, AP1 sends a data transmission instruction message to STA1 on the channel obtained in competition.

STA1 returns a data transmission response message to the STA according to the data transmission indication message.

Step 303, AP1 receives the data transmission response message returned by STA1, the data transmission response message includes a CCA report, and the CCA report includes the identity of the interference source AP2, the interference intensity of the interference source AP2, the remaining interference time of AP2, and the interference intensity of internal interference .

The data transmission response message may also include a CTS message.

Step 304, AP1 calculates a first transmission rate according to the signal strength, the interference strength of the interference source AP2, and the interference strength of internal interference.

For the specific implementation manner of steps 302-304, reference may be made to the description of Embodiment 1, which will not be repeated here.

Step 305, AP1 calculates the first transmission time according to the size of the data to be sent and the first transmission rate.

Assuming that the first transmission rate is R ₁ and the size of the data to be sent is L, then the first transmission time

Step 306, AP1 calculates the second transmission rate according to the signal strength and the interference strength of the internal interference.

For the specific implementation manner of this step, reference may be made to the relevant description of Embodiment 1, which will not be repeated here.

Step 307, AP1 calculates the second transmission time according to the size of the data to be sent and the second transmission rate.

Assuming that the second transmission rate is: R ₂ , the size of the data to be sent is L, then the second transmission time

Step 308, AP1 judges whether the first transmission time is greater than the sum of the second transmission time and the remaining interference time of the interference source AP2.

If the first transmission time is greater than the sum of the second transmission time and the remaining interference time of the interference source AP2, then perform step 309, if the first transmission time is less than or equal to the sum of the second transmission time and the remaining interference time of the interference source AP2, then Execute step 310 .

In step 309, after the remaining interference time of the interference source AP2 ends, the AP1 transmits the data to be sent to the STA1 by using the second transmission rate on the channel.

Optionally, AP1 sends data to other STAs before the remaining interference duration of main interference source AP2 ends.

Step 310 , after receiving the data transmission response, AP1 transmits the data to be sent to STA1 using the first transmission rate on the channel after an interval of SIFI.

Figure 7 is a schematic diagram of data transmission using the method of the prior art, and Figure 8 is a schematic diagram of data transmission using the method of Embodiment 3, comparing Figure 7 and Figure 8, before and after the remaining interference time of the interference source AP2 in Figure 7 ends, AP1 transmits the data to be sent to STA1 by using the lower first transmission rate, and the required first transmission time T1 is shown in FIG. 1 . The method of this embodiment does not transmit data to STA1 before the remaining interference time of the interference source AP2 ends, but transmits the data to be sent to STA1 on the channel using the second transmission rate after the remaining interference time of the interference source AP2 ends, The time required to transmit the data to be sent using the second transmission rate is T2, and then add the waiting time of STA1 (that is, the remaining interference time of the interference source AP2) to obtain the time T3 required for STA1 to transmit the data to be sent, by comparing Figure 7 It can be seen from FIG. 8 that T3 is smaller than T1, so the method of this embodiment can complete the transmission in a shorter time, thereby improving resource utilization.

Fig. 9 is a schematic structural diagram of the method provided by Embodiment 4 of the present invention. This embodiment is described by taking the scene shown in Fig. 6 as an example. Please combine Fig. 6 and Fig. 9, the method provided by this embodiment may include the following steps:

Step 401, AP1 performs channel competition.

In step 402, AP1 sends a channel transmission indication message to STA1 on the channel obtained through competition.

STA1 returns a data transmission response message to the STA according to the data transmission indication message.

Step 403. AP1 receives the data transmission response message returned by STA1. The data transmission response message includes a CCA report, which includes the identity of the interference source AP2, the interference intensity of the interference source AP2, the remaining interference time of AP2, and the interference intensity of internal interference.

The data transmission response message may also include a CTS message.

Step 404, AP1 calculates a first transmission rate according to the signal strength, the interference strength of the interference source AP2, and the interference strength of internal interference.

For the specific implementation manner of steps 402-404, reference may be made to the description of Embodiment 1, which will not be repeated here.

Step 405, AP1 calculates the second transmission rate according to the signal strength and the interference strength of the internal interference.

Step 406, AP1 divides the data to be sent into a first sub-data segment and a second sub-data segment, and the transmission time of the first sub-data segment is equal to the remaining interference time of the interference source AP2.

Step 407: AP1 uses the first transmission rate to transmit the first sub-data segment to STA1 on the channel before the remaining interference time of the interference source AP2 ends, and uses the second transmission rate to transmit the sub-data segment on the channel after the remaining interference time of the interference source AP2 ends. transmit the second sub-data segment upward to STA1.

For the specific implementation manner of steps 402-407, reference may be made to the related description of Embodiment 1, which will not be repeated here.

Figure 10 is a schematic diagram of data transmission using the method of Embodiment 4. Comparing Figure 7 and Figure 10, before and after the remaining interference time of the interference source AP2 in Figure 7 ends, AP1 transmits to STA1 using the first transmission rate at a lower rate For the data to be sent, in the method of this embodiment, before the remaining interference time of the interference source AP2 ends, AP1 uses the first transmission rate to transmit the first sub-data segment to STA1, and after the remaining interference duration of the interference source AP2 ends, AP2 The second sub-data segment is transmitted to STA1 using the second transmission rate. Since the second transmission rate is higher than the first transmission rate, compared with the prior art, the method of this embodiment shortens the data transmission time.

It should be noted that the method of the present invention can also be applied in a multi-user scenario. In a multi-user scenario, the AP can carry the identifiers of multiple STAs in a data transmission instruction message, and the information required for the AP to transmit data to each STA. time, wherein the multiple STAs use channels of different frequencies. Multiple STAs can use Orthogonal Frequency Division Multiple Access (OFDMA) technology to send CCA reports to APs. For example, multiple APs send CCA reports to APs on different subcarriers. In good times, multiple STAs can send CTS messages in a compatible format (non-HT) on the same subcarrier. Figure 11 is a schematic diagram of multiple STAs sending data transmission response messages to the AP. In Figure 11, multiple STAs first use OFDMA technology to send CCA reports on multiple uplink subcarriers, and send CTS messages to the AP after sending the CCA reports . If the AP does not receive the CCA report from STA1, or the CCA information contained in the CCA report indicates that STA1 receives continuous strong interference, the AP does not transmit to STA1 in the subsequent data transmission, but transmits for other users.

FIG. 12 is another schematic diagram of multiple STAs sending data transmission response messages to the AP. In FIG. 12 , multiple STAs first send a CTS message, and then use OFDMA technology to send CCA reports on multiple subcarriers.

Both the data transmission response messages in Figure 11 and Figure 12 include a CCA report and a CTS message. FIG. 13 is a schematic diagram of multiple STAs sending a data transmission response message to an AP. The data transmission response message in FIG. 13 only includes a CCA report.

FIG. 14 is a schematic structural diagram of an AP provided in Embodiment 5 of the present invention. As shown in FIG. 14 , the AP provided in this embodiment includes: a sending module 11 , a receiving module 12 and a processing module 13 .

The sending module 11 is configured to send a data transmission indication message to the STA on a channel, the data transmission indication message is used to notify the STA that the AP has data to send to the STA, and the data transmission indication message includes the The identity of the STA and the time when the AP sends data to the STA and occupies the channel;

The receiving module 12 is configured to receive a free channel assessment CCA report of the channel returned by the STA according to the data transmission instruction message, the CCA report includes: N interference source identities, each of the N interference sources The interference intensity generated by each interference source, the remaining interference time of each interference source, and the interference intensity of the internal interference of the channel, the interference intensity of the internal interference refers to the interference intensity generated by the N interference sources after the end of the interference. The intensity of interference received by the channel, N is a positive integer greater than or equal to 1;

The processing module 13 is configured to determine N1 main interference sources and N2 secondary interference sources from the N interference sources according to the interference strength of the N interference sources, and the main interference sources are the N Among the interference sources, the interference source with higher interference intensity, the secondary interference source is the interference source with lower interference intensity among the N interference sources, N1 is a positive integer greater than or equal to 1, and N2 is an interference source greater than or equal to 0 Positive integer, N=N1+N2;

The processing module 13 is further configured to calculate, according to the acquired signal strength on the channel, the interference strength of the N interference sources, and the interference strength of the internal interference, the AP's signal strength in the N interference sources a first transmission rate used to transmit the data to be sent when the internal interference exists simultaneously;

The processing module 13 is further configured to, according to the signal strength, the N2 secondary interference sources The interference intensity of the interference intensity and the interference intensity of the internal interference, calculating the second transmission rate used by the AP to transmit the data to be sent when the N2 secondary interference sources and the internal interference exist simultaneously;

The processing module 13 is further configured to transmit to the STA on the channel the to-be-transmitted data, the transmission time of the data to be sent is less than the transmission time required by the STA to transmit the data to be sent when interference from the N interference sources exists.

Optionally, the processing module 13 calculates the first transmission rate according to a first formula, where the first formula is: Wherein, R ₁ represents the first transmission rate, S represents the signal strength, I _i represents the interference strength of the ith main interference source, and I _r represents the interference strength of the internal interference.

Optionally, the processing module 13 calculates the second transmission rate according to a second formula, and the second calculation formula is: Wherein, R ₂ represents the second transmission rate, and I _j represents the interference intensity of the jth secondary interference source.

In this embodiment, the receiving module 12 is further configured to: obtain the signal strength according to the received power obtained when receiving the CCA report; or receive the signal strength sent by the STA, and the signal strength is the The STA obtains it according to the received power obtained when receiving the data transmission indication message.

Optionally, the time taken by the STA to send the CCA report to the AP is equal to the time taken by the STA to send a clear to send CTS message to the AP.

Optionally, the data transmission indication message further includes: clear sending CTS message indication information, where the indication information is used to indicate whether the STA returns a CTS message to the AP.

The AP in this embodiment can be used to execute the method in Embodiment 1, specific implementation methods and technologies The effect is similar and will not be repeated here.

Embodiment 6 of the present invention provides an AP. Refer to FIG. 14 for the structure of the AP provided in this embodiment. On the basis of the AP provided in Embodiment 5, in this embodiment, the processing module 13 according to the first transmission rate , the second transmission rate and the remaining interference time of the N1 main interference sources, and transmit the data to be sent to the STA on the channel, specifically: according to the size of the data to be sent and the Calculate the first transmission time at the first transmission rate; and calculate the second transmission time according to the size of the data to be sent and the second transmission rate; if the first transmission time is greater than the second transmission time and the N1 The sum of the maximum remaining interference durations of the main interference sources, after the maximum remaining interference duration of the N1 main interference sources ends, transmit the waiting time to the STA using the second transmission rate on the channel send data.

Optionally, the sending module is further configured to: use the first transmission rate to send data to other STAs on the channel before the maximum remaining interference time of the N1 main interference source ends.

The AP in this embodiment can be used to execute the method in Embodiment 3, and the specific implementation manner and technical effect are similar, and will not be repeated here.

Embodiment 7 of the present invention provides an AP. Refer to FIG. 14 for the structure of the AP provided in this embodiment. On the basis of the AP provided in Embodiment 5, in this embodiment, the processing module 13 according to the first transmission rate , the second transmission rate and the remaining interference time of the N1 main interference sources, and transmit the data to be sent to the STA on the channel, specifically: dividing the data to be sent into first sub-parts a data segment and a second sub-data segment, the first sub-data segment being transmitted before the second sub-data segment; transmitting the first sub-data to the STA on the channel using the first transmission rate transmit the second sub-data segment to the STA on the channel by using the second transmission rate.

In this embodiment, the processing module 13 divides the data to be sent into a first sub-data segment and a second sub-data segment, specifically: according to the first transmission rate and the maximum of the N1 main interference sources The remaining interference time calculates the size of the data that can be transmitted within the maximum remaining interference time of the N1 main interference sources; according to the size of the data that can be transmitted within the maximum remaining interference time of the N1 main interference sources, the to-be-sent data is divided into the first sub-data segment and In the second sub-data segment, the size of the first sub-data segment is greater than or equal to the size of data that the AP can transmit within the maximum remaining interference time of the N1 main interference sources.

The AP in this embodiment can be used to execute the method in Embodiment 4, and the specific implementation manner and technical effect are similar, and will not be repeated here.

FIG. 15 is a schematic structural diagram of an STA provided in Embodiment 8 of the present invention. As shown in FIG. 15 , the STA provided in this embodiment includes: a receiving module 21 , an acquiring module 22 and a sending module 23 .

The receiving module 21 is configured to receive a data transmission indication message sent by the AP on a channel, the data transmission indication message is used to notify the STA that the AP has data to send to the STA, and the data transmission indication message includes the The identity of the STA and the time during which the AP sends data to the STA and occupies the channel;

The obtaining module 22 is configured to obtain the free channel assessment CCA information of the channel according to the data transmission indication message, and the CCA information is used to indicate that the channel is idle, the channel is busy, or the channel is interfered;

A sending module 23, configured to send the CCA report to the AP if the CCA information indicates that the channel is interfered, so that the AP transmits the data to be sent to the STA according to the CCA report, the The CCA report includes: the identification of N interference sources, the interference intensity generated by each interference source in the N interference sources, the remaining interference time of each interference source, and the interference intensity of internal interference of the channel, the The interference strength of the internal interference refers to the interference strength received by the channel after the interference generated by the N interference sources ends, and N is a positive integer greater than or equal to 1.

Optionally, the STA further includes: a determining module, configured to determine that the AP included in the data transmission instruction message takes up data to be sent to the STA before the sending module 23 sends the CCA report to the AP. Whether the time of the channel is greater than the preset time threshold; if the time that the AP includes in the data transmission indication message to send data to the STA occupies the channel is greater than the time threshold, then determine to send data to the AP Send the CCA report; if the time occupied by the channel for the AP to send data to the STA included in the data transmission indication message is less than or equal to the time threshold, determine to return a CTS message to the AP.

Optionally, the data transmission indication message further includes: indication information of a CTS message, so The indication information is used to indicate whether the STA returns a CTS message to the AP; if the indication information is used to indicate the STA to return a CTS message to the AP, the sending module is also used to: Before or after sending the CCA report, the AP sends a CTS message to the AP.

The STA in this embodiment can be used to execute the method provided in Embodiment 2, and the specific implementation manner and technical effect are similar, and will not be repeated here.

FIG. 16 is a schematic structural diagram of an AP provided by Embodiment 9 of the present invention. As shown in FIG. 16 , the AP300 provided in this embodiment includes: a processor 31, a memory 32, a communication interface 33, and a system bus 34. The memory 32 and The communication interface 33 is connected to the processor 31 through the system bus 34 and completes mutual communication, the memory 32 is used to store computer execution instructions, and the communication interface 33 is used to communicate with other devices, so The processor 31 is used to run the computer to execute instructions, so that the AP300 performs the following method:

Send a data transmission indication message to the STA on the channel, the data transmission indication message is used to notify the STA that the AP has data to send to the STA, and the data transmission indication message includes the identity of the STA and the The time during which the AP sends data to the STA and occupies the channel;

Receive the free channel assessment CCA report of the channel returned by the STA according to the data transmission instruction message, the CCA report includes: the identification of N interference sources, the interference generated by each interference source in the N interference sources Intensity, the remaining interference time of each interference source, and the interference intensity of the internal interference of the channel, the interference intensity of the internal interference refers to the interference intensity of the channel after the interference generated by the N interference sources ends , N is a positive integer greater than or equal to 1;

According to the interference intensity of the N interference sources, determine N1 main interference sources and N2 secondary interference sources from the N interference sources, and the main interference source is that the interference intensity is relatively high among the N interference sources A large interference source, the secondary interference source is an interference source with a smaller interference intensity among the N interference sources, N1 is a positive integer greater than or equal to 1, N2 is a positive integer greater than or equal to 0, N=N1 +N2;

According to the obtained signal strength on the channel, the interference strength of the N interference sources, and the interference strength of the internal interference, calculate the transmission of the AP when the N interference sources and the internal interference exist simultaneously the first transmission rate used by the data to be sent;

According to the signal strength, the interference strength of the N2 secondary interference sources and the internal interference The interference intensity, calculating the second transmission rate used by the AP to transmit the data to be sent when the N2 secondary interference sources and the internal interference exist simultaneously;

According to the first transmission rate, the second transmission rate, and the remaining interference time of the N1 main interference sources, transmit the data to be sent to the STA on the channel, and transmit the data to be sent to the STA The time is shorter than the transmission time required by the STA to transmit the data to be sent when the interference of the N interference sources exists.

Optionally, the processor 31 transmits the to-be-transmitted message to the STA on the channel according to the first transmission rate, the second transmission rate, and the remaining interference time of the N1 main interferers. data, specifically: calculating a first transmission time according to the size of the data to be sent and the first transmission rate; and calculating a second transmission time according to the size of the data to be sent and the second transmission rate; if the If the first transmission time is greater than the sum of the second transmission time and the maximum remaining interference time of the N1 main interference sources, then after the maximum remaining interference duration of the N1 main interference sources ends, the channel transmit the to-be-sent data to the STA by using the second transmission rate.

Optionally, the processor 31 is further configured to: use the first transmission rate to send data to other STAs on the channel before the maximum remaining interference time of the main N1 interference source ends.

Optionally, the processor 31 transmits the to-be-transmitted message to the STA on the channel according to the first transmission rate, the second transmission rate, and the remaining interference time of the N1 main interferers. data, specifically: dividing the data to be sent into a first sub-data segment and a second sub-data segment, the first sub-data segment being transmitted before the second sub-data segment; using the first transmission rate transmit the first sub-data segment to the STA on the channel, and transmit the second sub-data segment to the STA on the channel by using the second transmission rate.

Optionally, the processor 31 divides the data to be sent into a first sub-data segment and a second sub-data segment, specifically: according to the first transmission rate and the maximum remaining Calculate the size of the data that can be transmitted within the maximum remaining interference time of the N1 main interference sources by the interference time; according to the size of the data that can be transmitted by the AP within the maximum remaining interference time of the N1 main interference sources The data to be sent is divided into the first sub-data segment and the second sub-data segment, and the size of the first sub-data segment is greater than or equal to that of the AP in the N1 masters. The size of the data that can be transmitted within the maximum remaining interference time of the interference source.

Optionally, the processor 31 calculates the first transmission rate according to a first formula, where the first formula is: Wherein, R ₁ represents the first transmission rate, S represents the signal strength, I _i represents the interference strength of the ith main interference source, and I _r represents the interference strength of the internal interference.

Optionally, the processor 31 calculates the second transmission rate according to a second formula, where the second calculation formula is: Wherein, R ₂ represents the second transmission rate, and I _j represents the interference intensity of the jth secondary interference source.

In this embodiment, the processor 31 is further configured to: obtain the signal strength according to the received power obtained when receiving the CCA report; or receive the signal strength sent by the STA, where the signal strength is the The STA obtains it according to the received power obtained when receiving the data transmission indication message.

Optionally, the time taken by the STA to send the CCA report to the AP is equal to the time taken by the STA to send a clear to send CTS message to the AP.

Optionally, the data transmission indication message further includes: clear sending CTS message indication information, where the indication information is used to indicate whether the STA returns a CTS message to the AP.

The AP in this embodiment can be used to implement the methods provided in Embodiment 1, Embodiment 3, and Embodiment 4. The specific implementation manner and technical effect are similar, and will not be repeated here.

FIG. 17 is a schematic structural diagram of an STA provided in Embodiment 10 of the present invention. As shown in FIG. 17 , the STA400 provided in this embodiment includes: a processor 41, a memory 42, a communication interface 43, and a system bus 44. The memory 42 and the The communication interface 43 is connected to the processor 41 through the system bus 44 and completes mutual communication, the memory 42 is used to store computer execution instructions, and the communication interface 43 is used to communicate with other devices. The processor 41 is configured to run the computer to execute instructions, so that the STA400 performs the following method:

Receive the data transmission indication message sent by the AP on the channel, the data transmission indication message is used to notify the STA that the AP has data to send to the STA, and the data transmission indication message includes the identity of the STA and the The time during which the AP sends data to the STA and occupies the channel;

Obtaining idle channel assessment CCA information of the channel according to the data transmission indication message, the CCA information is used to indicate that the channel is idle, the channel is busy, or the channel is interfered;

If the CCA information indicates that the channel is interfered, send the CCA report to the AP, so that the AP transmits the data to be sent to the STA according to the CCA report, and the CCA report includes: N The identity of the interference source, the interference intensity generated by each of the N interference sources, the remaining interference time of each interference source, and the interference intensity of the internal interference of the channel, the interference intensity of the internal interference is refers to the intensity of interference received by the channel after the interference generated by the N interference sources ends, and N is a positive integer greater than or equal to 1.

Optionally, before the STA sends the CCA report to the AP, the processor 41 is further configured to: determine that the AP included in the data transmission instruction message occupies the channel by sending data to the STA Whether the time is greater than the preset time threshold; if the time that the AP sends data to the STA and occupies the channel included in the data transmission indication message is greater than the time threshold, then determine to send the AP to the AP CCA report; if the time that the AP sends data to the STA and occupies the channel included in the data transmission instruction message is less than or equal to the time threshold, then determine to return a clear to send CTS message to the AP.

Optionally, the data transmission indication message further includes: indication information of a CTS message, the indication information is used to indicate whether the STA returns a CTS message to the AP; if the indication information is used to indicate the STA Returning a CTS message to the AP, the processor 41 is further configured to: send a CTS message to the AP before or after sending the CCA report to the AP.

The STA in this embodiment can be used to execute the method provided in Embodiment 2, and the specific implementation manner and technical effect are similar, and will not be repeated here.

Those of ordinary skill in the art can understand that all or part of the steps to realize the above method embodiments can be completed by program instructions related hardware, and the aforementioned programs can be stored in a computer Reading the storage medium, when the program is executed, executes the steps of the above-mentioned method embodiments; and the aforementioned storage medium includes: ROM, RAM, magnetic disk or optical disk and other various media that can store program codes.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: It is still possible to modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the various embodiments of the present invention. scope.

Claims (26)

A data transmission method, characterized in that, comprising: The access point AP sends a data transmission instruction message to the station STA on the channel, the data transmission instruction message is used to notify the STA that the AP has data to send to the STA, and the data transmission instruction message includes the STA and the time during which the AP sends data to the STA and occupies the channel; The AP receives the free channel assessment CCA report of the channel returned by the STA according to the data transmission indication message, and the CCA report includes: N interference source identities, each interference source in the N interference source The generated interference intensity, the remaining interference time of each interference source, and the interference intensity of the internal interference of the channel, the interference intensity of the internal interference refers to the interference of the channel after the interference generated by the N interference sources The interference intensity of , N is a positive integer greater than or equal to 1; The AP determines N1 main interference sources and N2 secondary interference sources from the N interference sources according to the interference strengths of the N interference sources, and the main interference sources are the N interference sources An interference source with a greater interference intensity, the secondary interference source is an interference source with a smaller interference intensity among the N interference sources, N1 is a positive integer greater than or equal to 1, and N2 is a positive integer greater than or equal to 0, N=N1+N2; The AP calculates, according to the obtained signal strength on the channel, the interference strength of the N interference sources, and the interference strength of the internal interference, that the AP is at the same time as the N interference sources and the internal interference. A first transmission rate used to transmit the data to be sent if present; According to the signal strength, the interference strength of the N2 secondary interference sources, and the interference strength of the internal interference, the AP calculates when the N2 secondary interference sources and the internal interference exist simultaneously a second transmission rate used for transmitting the data to be sent; The AP transmits the to-be-sent data to the STA on the channel according to the first transmission rate, the second transmission rate, and the remaining interference time of the N1 main interference sources, and the to-be-sent data The data transmission time is less than the transmission time required by the STA to transmit the data to be sent when the interference of the N interference sources exists. The method according to claim 1, wherein the AP transmission rate, the second transmission rate, and the remaining interference time of the N1 main interference sources, and transmit the data to be sent to the STA on the channel, including: The AP calculates a first transmission time according to the size of the data to be sent and the first transmission rate; The AP calculates a second transmission time according to the size of the data to be sent and the second transmission rate; If the first transmission time is greater than the sum of the second transmission time and the maximum remaining interference time of the N1 main interference sources, the AP , using the second transmission rate to transmit the data to be sent to the STA on the channel. The method according to claim 2, further comprising: The AP uses the first transmission rate to send data to other STAs on the channel before the maximum remaining interference time of the N1 main interference source ends. The method according to claim 1, characterized in that, the AP transmits information to all N1 main interference sources on the channel according to the first transmission rate, the second transmission rate, and the remaining interference time of the N1 main interference sources. The STA transmits the data to be sent, including: The AP divides the data to be sent into a first sub-data segment and a second sub-data segment, and the first sub-data segment is transmitted before the second sub-data segment; The AP transmits the first sub-data segment to the STA on the channel by using the first transmission rate, and the AP transmits the sub-data segment to the STA on the channel by using the second transmission rate. The second sub-data segment. The method according to claim 4, wherein the AP divides the data to be sent into a first sub-data segment and a second sub-data segment, comprising: The AP calculates the size of data that can be transmitted within the maximum remaining interference time of the N1 main interference sources according to the first transmission rate and the maximum remaining interference time of the N1 main interference sources; The AP divides the data to be sent into the first sub-data segment and the second sub-data segment according to the size of the data that the AP can transmit within the maximum remaining interference time of the N1 major interference sources. A sub-data segment, where the size of the first sub-data segment is greater than or equal to the size of data that the AP can transmit within the maximum remaining interference time of the N1 main interference sources. The method according to any one of claims 1-5, wherein the AP calculates the The first transmission rate used by the AP to transmit the data to be sent when the N interference sources and the internal interference exist simultaneously includes: The AP calculates the first transmission rate according to a first formula, and the first formula is: Wherein, _R represents the _first transmission rate, S represents the signal strength, I represents the interference strength of the _ith main interference source, and I represents the interference strength of the internal interference; According to the signal strength, the interference strength of the N2 secondary interference sources, and the interference strength of the internal interference, the AP calculates when the N2 secondary interference sources and the internal interference exist simultaneously The second transmission rate used for transmitting the data to be sent includes: The AP calculates the second transmission rate according to a second formula, and the second calculation formula is: Wherein, R ₂ represents the second transmission rate, and I _j represents the interference intensity of the jth secondary interference source. The method according to any one of claims 1-6, wherein the method further comprises: The AP obtains the signal strength according to the received power obtained when receiving the CCA report; Alternatively, the AP receives the signal strength sent by the STA, where the signal strength is obtained by the STA according to the received power obtained when receiving the data transmission indication message. The method according to any one of claims 1-7, wherein the time taken by the STA to send the CCA report to the AP is equal to the time taken by the STA to send a clear to send CTS message to the AP time. The method according to claim 1, wherein the data transmission indication message further includes: clear sending CTS message indication information, the indication information being used to indicate whether the STA returns a CTS message to the AP. A data transmission method, characterized in that, comprising: The station STA receives the data transmission instruction message sent by the access point AP on the channel, the data transmission instruction message is used to notify the STA that the AP has data to send to the STA, and the data transmission instruction message includes the The identity of the STA and the time when the AP sends data to the STA and occupies the channel; The STA obtains the free channel assessment CCA information of the channel according to the data transmission indication message, and the CCA information is used to indicate that the channel is idle, the channel is busy, or the channel is interfered; If the CCA information indicates that the channel is interfered, the STA sends the CCA report to the AP, so that the AP transmits the data to be sent to the STA according to the CCA report, and the CCA report includes : the identification of N interference sources, the interference intensity generated by each interference source in the N interference sources, the remaining interference time of each interference source, and the interference intensity of internal interference of the channel, and the interference intensity of the internal interference The interference intensity refers to the interference intensity received by the channel after the interference generated by the N interference sources ends, and N is a positive integer greater than or equal to 1. The method according to claim 10, wherein before the STA sends the CCA report to the AP, the method further comprises: The STA determines whether the time for the AP to send data to the STA and occupy the channel included in the data transmission instruction message is greater than a preset time threshold; If the time that the AP sends data to the STA and occupies the channel included in the data transmission indication message is greater than the time threshold, the STA determines to send the CCA report to the AP; If the time that the AP sends data to the STA and occupies the channel included in the data transmission indication message is less than or equal to the time threshold, the STA determines to return a clear to send CTS message to the AP. The method according to claim 10, wherein the data transmission instruction The information also includes: clear sending CTS message indication information, where the indication information is used to indicate whether the STA returns a CTS message to the AP; If the indication information is used to instruct the STA to return a CTS message to the AP, the method further includes: The STA sends a CTS message to the AP before or after sending the CCA report to the AP. An access point AP is characterized in that, comprising: A sending module, configured to send a data transmission instruction message to the station STA on a channel, the data transmission instruction message is used to notify the STA that the AP has data to send to the STA, and the data transmission instruction message includes the The identity of the STA and the time when the AP sends data to the STA and occupies the channel; A receiving module, configured to receive a free channel assessment CCA report of the channel returned by the STA according to the data transmission indication message, the CCA report includes: N interference source identities, each of the N interference sources The interference strength generated by the interference source, the remaining interference time of each interference source, and the interference strength of the internal interference of the channel, the interference strength of the internal interference refers to the The intensity of interference received by the channel, N is a positive integer greater than or equal to 1; A processing module, configured to determine N1 main interference sources and N2 secondary interference sources from the N interference sources according to the interference strength of the N interference sources, the main interference sources being the N interference sources Among the sources, the interference source with greater interference intensity, the secondary interference source is the interference source with smaller interference intensity among the N interference sources, N1 is a positive integer greater than or equal to 1, and N2 is a positive integer greater than or equal to 0 Integer, N=N1+N2; The processing module is further configured to calculate, according to the acquired signal strength on the channel, the interference strength of the N interference sources, and the interference strength of the internal interference, the AP's The first transmission rate used to transmit the data to be sent when the internal interference exists at the same time; The processing module is further configured to calculate, according to the signal strength, the interference strength of the N2 secondary interference sources, and the interference strength of the internal interference, whether the AP is in the N2 secondary interference A second transmission rate used to transmit the data to be sent when an interference source and the internal interference exist simultaneously; The processing module is further configured to transmit the data to be sent to the STA on the channel according to the first transmission rate, the second transmission rate, and the remaining interference time of the N1 main interference sources , the transmission time of the data to be sent is less than the transmission time required by the STA to transmit the data to be sent when interference from the N interference sources exists. The AP according to claim 13, wherein the processing module transmits information to the channel on the channel according to the first transmission rate, the second transmission rate, and the remaining interference time of the N1 main interference sources The STA transmits the data to be sent, specifically: calculating a first transmission time according to the size of the data to be sent and the first transmission rate; calculating a second transmission time according to the size of the data to be sent and the second transmission rate; If the first transmission time is greater than the sum of the second transmission time and the maximum remaining interference time of the N1 main interference sources, after the maximum remaining interference duration of the N1 main interference sources ends, in the transmit the data to be sent to the STA by using the second transmission rate on the channel. The AP according to claim 14, wherein the sending module is also used for: Before the maximum remaining interference time of the N1 main interference source ends, send data to other STAs on the channel by using the first transmission rate. The AP according to claim 13, wherein the processing module transmits information to the channel on the channel according to the first transmission rate, the second transmission rate, and the remaining interference time of the N1 main interference sources The STA transmits the data to be sent, specifically: dividing the data to be sent into a first sub-data segment and a second sub-data segment, the first sub-data segment being transmitted before the second sub-data segment; transmitting the first sub-data segment to the STA on the channel by using the first transmission rate, and transmitting the second sub-data segment to the STA on the channel by using the second transmission rate. The AP according to claim 16, wherein the processing module divides the data to be sent into a first sub-data segment and a second sub-data segment, specifically: Calculate the size of data that can be transmitted within the maximum remaining interference time of the N1 main interference sources according to the first transmission rate and the maximum remaining interference time of the N1 main interference sources; According to the size of the data that can be transmitted within the maximum remaining interference time of the N1 main interference sources, the data to be sent is divided into the first sub-data segment and the second sub-data segment, the first sub-data The size of the segment is greater than or equal to the size of data that the AP can transmit within the maximum remaining interference time of the N1 main interference sources. The AP according to any one of claims 13-17, wherein the processing module calculates the obtained signal strength according to the obtained signal strength, the interference strength of the N interference sources, and the interference strength of the internal interference The first transmission rate used by the AP to transmit the data to be sent when the N interference sources and the internal interference exist simultaneously, specifically: Calculate the first transmission rate according to a first formula, where the first formula is: Wherein, _R represents the _first transmission rate, S represents the signal strength, I represents the interference strength of the _ith main interference source, and I represents the interference strength of the internal interference; The processing module, according to the signal strength, the interference strength of the N2 secondary interference sources, and the interference strength of the internal interference, calculates that the AP exists at the same time as the N2 secondary interference sources and the internal interference The second transmission rate used to transmit the data to be sent at the same time, specifically: Calculate the second transmission rate according to a second formula, where the second calculation formula is: Wherein, R ₂ represents the second transmission rate, and I _j represents the interference intensity of the jth secondary interference source. The AP according to any one of claims 13-18, wherein the The receiving module is also used to: obtaining the signal strength according to the received power obtained when receiving the CCA report; Or, receive the signal strength sent by the STA, where the signal strength is obtained by the STA according to the received power obtained when receiving the data transmission indication message. The AP according to any one of claims 13-19, wherein the time taken by the STA to send the CCA report to the AP is equal to the time taken by the STA to send a clear to send CTS message to the AP time. The AP according to claim 13, wherein the data transmission indication message further includes: clear sending CTS message indication information, the indication information being used to indicate whether the STA returns a CTS message to the AP. A station STA is characterized in that it includes: The receiving module is configured to receive a data transmission instruction message sent by the access point AP on a channel, the data transmission instruction message is used to notify the STA that the AP has data to send to the STA, and the data transmission instruction message contains Including the identity of the STA and the time when the AP sends data to the STA and occupies the channel; An acquiring module, configured to acquire the free channel assessment CCA information of the channel according to the data transmission indication message, where the CCA information is used to indicate that the channel is idle, the channel is busy, or the channel is interfered; A sending module, configured to send the CCA report to the AP if the CCA information indicates that the channel is interfered, so that the AP transmits the data to be sent to the STA according to the CCA report, and the CCA The report includes: the identification of N interference sources, the interference intensity generated by each interference source in the N interference sources, the remaining interference time of each interference source, and the interference intensity of internal interference of the channel, the internal The interference intensity of interference refers to the interference intensity received by the channel after the interference generated by the N interference sources ends, and N is a positive integer greater than or equal to 1. The STA according to claim 22, further comprising: a determining module, configured to determine that the data sent by the AP to the STA in the data transmission indication message occupies the Whether the time of the channel is greater than the preset time threshold; If the time that the AP sends data to the STA and occupies the channel included in the data transmission indication message is greater than the time threshold, determine to send the CCA report to the AP; If the time that the AP sends data to the STA and occupies the channel included in the data transmission indication message is less than or equal to the time threshold, determine to return a clear to send CTS message to the AP. The STA according to claim 22, wherein the data transmission indication message further includes: clear sending CTS message indication information, the indication information being used to indicate whether the STA returns a CTS message to the AP; If the indication information is used to instruct the STA to return a CTS message to the AP, the sending module is further configured to: Sending a CTS message to the AP before or after sending the CCA report to the AP. An access point AP, characterized in that it includes: a processor, a memory, a communication interface, and a system bus, the memory and the communication interface are connected to the processor through the system bus and complete mutual communication, The memory is used to store computer-executed instructions, the communication interface is used to communicate with other devices, and the processor is used to run the computer-executed instructions so that the AP executes the method described in any one of claims 1-9. method. A station STA, characterized in that it includes: a processor, a memory, a communication interface, and a system bus, the memory and the communication interface are connected to the processor through the system bus and complete mutual communication, the The memory is used to store computer-executed instructions, the communication interface is used to communicate with other devices, and the processor is used to run the computer-executed instructions to make the STA execute the method according to any one of claims 10-12.