CN107431954B - Data transmission method and device - Google Patents

Data transmission method and device Download PDF

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CN107431954B
CN107431954B CN201580078799.9A CN201580078799A CN107431954B CN 107431954 B CN107431954 B CN 107431954B CN 201580078799 A CN201580078799 A CN 201580078799A CN 107431954 B CN107431954 B CN 107431954B
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interference
data
sta
channel
transmitted
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CN107431954A (en
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李彦淳
李云波
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Huawei Technologies Co Ltd
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W24/00Supervisory, monitoring or testing arrangements
    • H04W24/10Scheduling measurement reports ; Arrangements for measurement reports
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W28/00Network traffic management; Network resource management
    • H04W28/16Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
    • H04W28/18Negotiating wireless communication parameters

Abstract

The embodiment of the invention provides a data transmission method and a data transmission device, wherein the data transmission method comprises the following steps: the AP receives interference information received by the STA, the AP determines not to transmit data in the residual interference time of the main interference source according to the interference information received by the STA, but transmits the data at a higher transmission rate after the residual interference time of the main interference source is finished, or transmits the data at a lower rate in the residual interference time of the main interference source and transmits the data at a higher transmission rate after the residual interference time of the main interference source is finished, so that the transmission of the data to be transmitted can be completed more quickly, the data transmission efficiency is improved, and the utilization rate of wireless resources is improved.

Description

Data transmission method and device
Technical Field
The present invention relates to communications technologies, and in particular, to a data transmission method and apparatus.
Background
In recent years, a wireless local area network (W L AN) has been deeply researched in daily life of people, a W L AN mainly includes two network entities, namely AN Access Point (AP) and a Station (STA), the STA is a terminal device in the W L AN, the AP is a relay node that is connected to the W L AN and the internet, and is responsible for sending data of the STA to the internet and sending data of the internet to the STA.
In order to solve the above problem, the current main technical direction is to raise the CCA threshold, and the raised CCA threshold is greater than the receiving sensitivity. During the CCA procedure, as long as the strength of the received signal is less than the CCA threshold, the STA determines that the channel is clear, i.e., the STA determines that the channel is clear in both cases: whether the strength of the received signal is less than the reception sensitivity or greater than the reception sensitivity but less than the CCA threshold, the STA determines that the channel is clear.
Under the condition that the strength of a received signal is greater than the receiving sensitivity but less than the CCA threshold, the STA is actually interfered, and 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 occupies more air interface resources.
Disclosure of Invention
Embodiments of the present invention provide a data transmission method and apparatus, which improve data transmission efficiency and utilization rate of wireless resources.
A first aspect of the present invention provides a data transmission method, including:
an AP sends a data transmission indication message to an STA on a channel, wherein the data transmission indication message is used for informing the STA that the AP has data to send to the STA, and the data transmission indication message comprises an identification of the STA and time of the AP sending the data to the STA to occupy the channel;
the AP receives a Clear Channel Assessment (CCA) report of the channel returned by the STA according to the data transmission indication message, wherein the CCA report comprises: 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 is finished, and 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 intensity of the N interference sources, wherein the main interference source is one of the N interference sources with higher interference intensity, the secondary interference source is one of the N interference sources with lower interference intensity, N1 is a positive integer greater than or equal to 1, N2 is a positive integer greater than or equal to 0, and N1+ N2;
the AP calculates a first transmission rate used by the AP for transmitting data to be transmitted when the N interference sources and the internal interference exist simultaneously according to the acquired signal intensity on the channel, the interference intensities of the N interference sources and the interference intensity of the internal interference;
the AP calculates a second transmission rate used by the AP for transmitting the data to be transmitted 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;
and the AP transmits the data to be transmitted to the STA on the channel according to the first transmission rate, the second transmission rate and the residual interference time of the N1 main interference sources, wherein the transmission time of the data to be transmitted is less than the transmission time required by the STA for transmitting the data to be transmitted when the interference of the N interference sources exists.
With reference to the first aspect, in a first possible implementation manner of the first aspect, the transmitting, by the AP, the data to be transmitted to the STA on the channel according to the first transmission rate, the second transmission rate, and the remaining interference times of the N1 dominant interference sources includes:
the AP calculates first transmission time according to the size of the data to be transmitted and the first transmission rate;
the AP calculates a second transmission time according to the size of the data to be transmitted 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 dominant interferers, the AP transmits the data to be transmitted to the STA on the channel using the second transmission rate after the maximum remaining interference duration of the N1 dominant interferers is over.
With reference to the first possible implementation manner of the first aspect, in a second possible implementation manner of the first aspect, the method further includes:
and the AP sends data to other STAs on the channel by using the first transmission rate before the maximum residual interference time of the N1 main interference source is ended.
With reference to the first aspect, in a third possible implementation manner of the first aspect, the transmitting, by the AP, the data to be transmitted to the STA on the channel according to the first transmission rate, the second transmission rate, and the remaining interference times of the N1 dominant interferers 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;
and the AP transmits the first sub data segment to the STA on the channel by using the first transmission rate, and transmits the second sub data segment to the STA on the channel by using the second transmission rate.
With reference to the third possible implementation manner of the first aspect, in a fourth possible implementation manner of the first aspect, the dividing, by the AP, the data to be sent into a first sub data segment and a second sub data segment includes:
the AP calculates the size of data which can be transmitted in the maximum residual interference time of the N1 main interference sources according to the first transmission rate and the maximum residual interference time of the N1 main interference sources;
the AP divides the data to be transmitted into the first sub data segment and the second sub data segment 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, where the size of the first sub data segment is greater than or equal 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.
With reference to the first aspect and any one of the first to fourth possible implementation manners of the first aspect, in a fifth possible implementation manner of the first aspect, the calculating, by the AP, a first transmission rate used by the AP to transmit the data to be transmitted when the N interference sources and the internal interference exist simultaneously according to the obtained signal strength, the interference strengths of the N interference sources, and the interference strength of the internal interference includes:
the AP calculates the first transmission rate according to a first formula, which is:
Figure GDA0002208787210000031
wherein R is1Representing said first transmission rate, S representing said signal strength, IiRepresenting the interference strength, I, of the I-th dominant interfererrRepresenting an interference strength of the internal interference;
the AP calculates a second transmission rate used by the AP for transmitting the data to be transmitted 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, and the method comprises the following steps:
the AP calculates the second transmission rate according to a second formula, where the second formula is:
Figure GDA0002208787210000032
wherein R is2Representing said second transmission rate, IjRepresenting the interference strength of the j-th secondary interferer.
With reference to the first aspect and any one of the first to fifth possible implementation manners of the first aspect, in a sixth possible implementation manner of the first aspect, the method further includes:
the AP obtains the signal strength according to the received power obtained when the CCA report is received;
or, 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 the data transmission indication message is received.
With reference to the first aspect and any one of the first to sixth possible implementation manners of the first aspect, in a seventh possible implementation manner of the first aspect, a time taken for the STA to send the CCA report to the AP is equal to a time taken for 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: and clearing indication information of sending the CTS message, wherein the indication information is used for indicating whether the STA returns the CTS message to the AP or not.
A second aspect of the present invention provides a data transmission method, including:
receiving, by an STA, a data transmission indication message sent by an AP on a channel, where 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 an identifier of the STA and a time occupied by the AP to send data to the STA on the channel;
the STA acquires Clear Channel Assessment (CCA) information of the channel according to the data transmission indication message, wherein the CCA information is used for indicating that the channel is clear, 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, where the CCA report includes: 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 is ended, 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 of the channel occupied by the data transmitted by the AP to the STA in the data transmission indication message is greater than a preset time threshold;
if the time for the AP to send data to the STA to occupy the channel, which is included in the data transmission indication message, is greater than the time threshold, the STA determines to send the CCA report to the AP;
and if the time for the AP to send the data to the STA to occupy the channel, which is 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: clearing indication information of sending a CTS message, wherein the indication information is used for indicating whether the STA returns the CTS message to the AP or not;
if the indication information is used to indicate that the STA returns a CTS message to the AP, the method further includes:
the STA sending 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 indication message to a station STA on a channel, where 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 an identifier of the STA and a time that the AP sends data to the STA and occupies the channel;
a receiving module, configured to receive a clear channel assessment CCA report of the channel returned by the STA according to the data transmission indication message, where the CCA report includes: 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 is finished, and N is a positive integer greater than or equal to 1;
a processing module, configured to determine, according to interference strengths of the N interference sources, N1 primary interference sources and N2 secondary interference sources from the N interference sources, where the primary interference source is an interference source with a higher interference strength among the N interference sources, the secondary interference source is an interference source with a lower interference strength 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 N1+ N2;
the processing module is further configured to calculate, according to the acquired signal strength on the channel, the interference strengths of the N interference sources, and the interference strength of the internal interference, a first transmission rate used by the AP to transmit data to be transmitted when the N interference sources and the internal interference coexist;
the processing module is further configured to calculate, according to the signal strength, the interference strengths of the N2 secondary interference sources, and the interference strength of the internal interference, a second transmission rate used by the AP to transmit the data to be transmitted when the N2 secondary interference sources and the internal interference exist simultaneously;
the processing module is further configured to transmit the data to be transmitted 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, where the data transmission time to be transmitted is less than transmission time required for the STA to transmit the data to be transmitted when the interference of the N interference sources exists.
With reference to the third aspect, in a first possible implementation manner of the third aspect, the transmitting, by the processing module, the data to be transmitted to the STA on the channel according to the first transmission rate, the second transmission rate, and the remaining interference time of the N1 dominant interference sources specifically includes:
calculating first transmission time according to the size of the data to be transmitted and the first transmission rate;
calculating a second transmission time according to the size of the data to be transmitted 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 dominant interferers, after the maximum remaining interference duration of the N1 dominant interferers is over, transmitting the data to be transmitted to the STA on the channel using the second transmission rate.
With reference to the first possible implementation manner of the third aspect, in a second possible implementation manner of the third aspect, the sending module is further configured to:
and transmitting data to other STAs on the channel by using the first transmission rate before the maximum residual interference time of the N1 main interference source is ended.
With reference to the third aspect, in a third possible implementation manner of the third aspect, the transmitting, by the processing module, the data to be transmitted to the STA on the channel according to the first transmission rate, the second transmission rate, and the remaining interference time of the N1 dominant interference sources specifically includes:
dividing the data to be sent into a first sub data segment and a second sub data segment, wherein the first sub data segment is transmitted before the second sub data segment;
and 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 manner of the third aspect, in a fourth possible implementation manner 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:
calculating the size of data which can be transmitted in 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;
dividing the data to be transmitted into the first sub data segment and the second sub data segment according to the size of the data capable of being transmitted in the maximum remaining interference time of the N1 main interference sources, where the size of the first sub data segment is greater than or equal to the size of the data capable of being transmitted in the maximum remaining interference time of the N1 main interference sources by the AP.
With reference to the third aspect and any one of the first to fourth possible implementation manners of the third aspect, in a fifth possible implementation manner of the third aspect, the calculating, by the processing module according to the obtained signal strength, the interference strengths of the N interference sources, and the interference strength of the internal interference, a first transmission rate used by the AP to transmit the data to be transmitted when the N interference sources and the internal interference exist simultaneously is specifically:
calculating the first transmission rate according to a first formula, wherein the first formula is as follows:
Figure GDA0002208787210000051
wherein R is1Representing said first transmission rate, S representing said signal strength, IiRepresenting the interference strength, I, of the I-th dominant interfererrRepresenting an interference strength of the internal interference;
the processing module calculates, according to the signal strength, the interference strengths of the N2 secondary interference sources, and the interference strength of the internal interference, a second transmission rate used by the AP to transmit the data to be transmitted when the N2 secondary interference sources and the internal interference coexist, specifically:
calculating the second transmission rate according to a second formula, wherein the second formula is as follows:
Figure GDA0002208787210000061
wherein R is2Representing said second transmission rate, IjRepresenting the interference strength of the j-th secondary interferer.
With reference to 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 the CCA report is received;
or, receiving the signal strength sent by the STA, where the signal strength is obtained by the STA according to the received power obtained when the data transmission indication message is received.
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, a time taken for the STA to send the CCA report to the AP is equal to a time taken for 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: and clearing indication information of sending the CTS message, wherein the indication information is used for indicating whether the STA returns the CTS message to the AP or not.
A fourth aspect of the present invention provides an STA comprising:
a receiving module, configured to receive, on a channel, a data transmission indication message sent by an access point AP, where 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 an identifier of the STA and a time that the AP sends data to the STA and occupies the channel;
an obtaining module, configured to obtain, according to the data transmission indication message, CCA information for evaluating a clear channel of the channel, where the CCA information is used to indicate that the channel is clear, 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 to-be-sent data to the STA according to the CCA report, where the CCA report includes: 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 is ended, and N is a positive integer greater than or equal to 1.
With reference to the fourth aspect, in a first possible implementation manner of the fourth aspect, the method further includes:
a determining module, configured to determine whether a time that the AP sends data to the STA and occupies the channel, which is included in the data transmission indication message, is greater than a preset time threshold before the sending module sends the CCA report to the AP;
if the time for the AP to send data to the STA to occupy the channel, which is included in the data transmission indication message, is greater than the time threshold, determining to send the CCA report to the AP;
and if the time for the AP to send the data to the STA to occupy the channel, which is included in the data transmission indication message, is less than or equal to the time threshold, determining 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: clearing indication information of sending a CTS message, wherein the indication information is used for indicating whether the STA returns the CTS message to the AP or not;
if the indication information is used to indicate that the STA returns a CTS message to the AP, the sending module is further configured to:
transmitting a CTS message to the AP before or after transmitting the CCA report to the AP.
A fifth aspect of the present invention provides an AP, including: the AP comprises a processor, a memory, a communication interface and a system bus, wherein the memory and the communication interface are connected with the processor through the system bus and complete mutual communication, the memory is used for storing computer execution instructions, the communication interface is used for communicating with other devices, and the processor is used for executing the computer execution instructions to enable the AP to execute the method according to the first aspect and any one of the first to eighth possible implementation manners of the first aspect.
A sixth aspect of the present invention provides an STA comprising: the STA comprises a processor, a memory, a communication interface and a system bus, wherein the memory and the communication interface are connected with the processor through the system bus and complete mutual communication, the memory is used for storing computer execution instructions, the communication interface is used for communicating with other devices, and the processor is used for executing the computer execution instructions to enable the STA to execute the method according to any one of the first possible implementation manner and the second possible implementation manner of the first aspect and the second aspect.
In the data transmission method and apparatus provided in the embodiments of the present invention, an AP receives a CCA report of a channel returned by an STA, where the CCA report includes: the identification of the main interference source, the interference intensity of the main interference source, the interference residual duration of the main interference source and other interference intensities, and the AP makes a data transmission decision according to the interference condition of the STA. Under the condition that the STA is subjected to strong interference, the transmission time of the data to be transmitted is shorter than the transmission time required by the STA for transmitting the data to be transmitted under the interference of the main interference source, and the transmission of the data to be transmitted can be completed more quickly, so that the data transmission efficiency is improved, and the utilization rate of wireless resources is improved.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic networking diagram of W L AN;
fig. 2 is a schematic diagram of a correspondence between CCA thresholds and actions performed;
fig. 3 is a flowchart of a data transmission method according to an embodiment of the present invention;
fig. 4 is a flowchart of a data transmission method according to a second embodiment of the present invention;
fig. 5 is a flowchart of a data transmission method according to a third embodiment of the present invention;
FIG. 6 is a diagram illustrating a third scenario in which the present invention is applicable;
FIG. 7 is a diagram illustrating a prior art method for transmitting data;
FIG. 8 is a diagram illustrating data transmission according to the third embodiment;
FIG. 9 is a schematic structural diagram of a method according to a fourth embodiment of the present invention;
FIG. 10 is a diagram illustrating data transmission according to the fourth embodiment;
fig. 11 is a diagram illustrating a plurality of STAs sending data transmission response messages to an AP;
fig. 12 is another diagram illustrating a plurality of STAs sending data transmission response messages to an AP;
fig. 13 is a diagram illustrating a plurality of STAs sending data transmission response messages to an AP;
fig. 14 is a schematic structural diagram of an AP according to a fifth embodiment of the present invention;
fig. 15 is a schematic structural diagram of an STA according to an eighth embodiment of the present invention;
fig. 16 is a schematic structural diagram of an AP according to a ninth embodiment of the present invention;
fig. 17 is a schematic structural diagram of an STA according to a tenth embodiment of the present invention.
Detailed Description
In order to make the objects, 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 with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The method of the embodiment of the present invention may be applied to a densely deployed W L AN, fig. 1 is a networking schematic diagram of a W L AN, as shown in fig. 1, there are two Basic Service Sets (BSS) 1 and BSS2 in the diagram, one BSS is composed of AN AP and multiple STAs associated with the AP, and generally, AN STA in a wireless signal coverage of the AP is associated with the AP, in AN actual application, it is common that multiple BSSs overlap in a coverage area, so that AN Overlapping BSS (OBSS) is formed, the coverage area where two BSSs overlap in fig. 1 is AN OBSS, and AN STA1 in the OBSS 1 is in the OBSS, assuming that the AP2 preempts a channel first, if the strength of data sent by the AP when reaching the STA1 exceeds the Sensitivity of a Receiver (Receiver Sensitivity L) of the STA1, the STA may successfully receive a packet from the AP2 to a Receiver (Receiver Session header) associated with a Media Session Control information (NAV) with a relatively high probability, and the STA may send a packet header information (Media Session Control Protocol) according to the NAV Session Control Protocol (NAV) Protocol, for example, which is called AN initial Media Session Control Protocol (NAV).
In fig. 1, if AP1 is ready To initiate data transmission To STA1, AP1 transmits RTS message To STA, but STA1 cannot return CTS message To AP1 due To NAV limitation, and AP1 does not receive the message sent by STA1, and tries To retransmit RTS message with short packet transmission mechanism, but STA1 cannot respond To air interface resource waste.
The current mainstream technology is to raise the CCA threshold level, where the raised CCA threshold P _ CCA > P _ sensitivity, and P _ sensitivity represents the receiving sensitivity of the STA. Fig. 2 is a schematic diagram of a corresponding relationship between a CCA threshold and an action to be performed, as shown in fig. 2, taking STA1 as an example, if the reception power of a data packet received by STA1 and sent by AP2 is P _ packet and P _ packet < P _ CCA, STA1 determines that the channel is idle, and STA1 returns a CTS message to AP 1. When P _ packet > P _ CCA, since the received power of STA1 is above the CCA threshold, STA1 determines that the channel is busy and STA1 does not return a CTS message to AP 1. When P _ sensitivity < P _ packet < P _ CCA, the STA1 determines that the channel is idle and available, the STA1 returns a CTS message to the AP1, and since the receiving power of the STA1 is higher than its receiving sensitivity, the STA1 may decode the header information of the packet sent by the AP2 with a high probability, and then sets the NAV time according to the header information. Meanwhile, the header of the data packet sent by the AP2 further includes BSScolor information or an Identity (Identity, abbreviated as ID) of the BSS, so as to inform the STA1 of which BSS the data packet comes from, and select the P _ CCA according to the information in the header.
As can be seen from the above description, in the prior art, as long as P _ packet < P _ CCA, STA1 can send CTS reply AP1 and AP1 can send data to STA1, and since STA1 is affected by interference from AP2, AP1 can only transmit to STA1 at a lower rate. In this case, low-rate transmission occupies more air interface resources, and after the data transmission of the AP2 is finished, the interference received by the STA1 is reduced, and the higher-rate transmission from the AP1 can be received, but in the prior art, the AP1 still transmits at a low rate, which results in resource waste.
In order to solve the problem in the prior art, an embodiment of the present invention provides a data transmission method, and fig. 3 is a flowchart of the data transmission method according to the embodiment of the present invention, as shown in fig. 3, the method according to the embodiment may include the following steps:
step 101, the AP sends a data transmission indication message to the STA on the channel, where 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 an identifier of the STA and a time for the AP to send data to the STA to occupy the channel.
The data transmission indication message may take the form of a newly defined message or may take the form of an existing message, such as an RTS message. The AP may carry the identity of the STA and the required time in the data transmission message. When the data transmission indication message employs an RTS message, the required transmission time included in the data transmission indication message may specifically be a NAV.
Step 102, the AP receives a CCA report of a channel returned by the STA according to the data transmission indication message, where the CCA report includes: the interference strength of the internal interference refers to the interference strength of the channel after the interference generated by the N interference sources is ended, and N is a positive integer greater than or equal to 1.
The AP broadcasts the data transmission indication message in a broadcast manner, STAs in a BSS to which the AP belongs may receive the data transmission message, and for a certain STA, after receiving the data transmission indication message, the STA determines whether an identifier of the STA included in the data transmission indication message is an identifier of the STA itself. And if the identification of the STA included in the data transmission indication message is the identification of the STA, the STA acquires CCA information of the channel. If the identification of the STA included in the data transmission indication message is the identification of other STAs, the STA analyzes the data transmission indication message and acquires the time required for the AP included in the data transmission indication message to send data to the STA.
After determining that the identification of the STA included in the data transmission indication message RTS message is the identification of the STA, the STA queries CCA information of the channel, where the CCA information is obtained by the STA through measurement in advance. In this embodiment, the CCA information may indicate that the channel is idle, the channel is busy, and the channel is interfered, where when the CCA information indicates that the channel is interfered, the CCA report includes: the identification of the N interference sources, the interference strength generated by each interference source in the N interference sources, the residual interference time of each interference source and the interference strength of the internal interference of the channel. If the CCA information indicates that the channel is busy, the STA does not return a data transmission response message to the AP, i.e., does not return any message 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, and after receiving the CTS message, the AP starts to transmit data after an SIFS, where SIFS (Short interface space, abbreviated as SIFS) represents a Short inter-frame interval. And if the channel is interfered, the data transmission response message comprises a CCA report or comprises the CCA report and a CTS message, and the interference condition of 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 the RTS message to the AP after receiving the data transmission indication message may be configured by the AP, for example, the AP carries indication information of the CTS message in the data transmission indication message, where the indication information is used to indicate whether the STA returns the CTS message to the AP. For example, the AP may carry the indication information by using a bit, for example, a value of the bit is 1 to indicate that the STA returns a CTS message to the AP, and a value of the bit is 0 to indicate that the STA does not return a CTS message to the AP, or a value of the bit is 1 to indicate that the STA does not return a CTS message to the AP, and a value of the bit is 0 to indicate that the STA returns a CTS message to the AP.
For STA1 to be likely to be interfered by multiple interferers, STA1 needs to report the interference strength of each interferer to the AP. For example, STA1 has 1 interferer, and the CCA message reported by STA1 is in the form: identification of the interference source 1, interference strength of the interference source 1, remaining interference time of the interference source 1, interference strength of internal interference. If STA1 has two interference sources, the CCA message reported by STA1 is in the form of: identification of interference source 1, interference strength of interference source 1, remaining interference time of interference source 1, identification of interference source 2, interference strength of interference source 2, remaining interference time of interference source 2, interference strength of internal interference.
Taking the example shown in fig. 1 as an example, the STA1 mainly obtains CCA information by determining that a channel is idle if the STA1 receives a reception power P _ packet < P _ CCA of an RTS message sent by the AP2, determining that the channel is busy if P _ packet > P _ CCA, determining that the channel is interfered by the STA1 if P _ reception < P _ packet < P _ CCA, parsing the RTS message by the STA1, obtaining the RTS message from the AP2 through header information, determining that an interferer is the AP2, and obtaining a NAV2 from the RTS message, wherein NAV2 represents the maximum time that the AP2 occupies the channel, for the STA1, NAV2 is the total interference time of the interferer AP2, P _ packet is the interference strength of the interferer AP2, and the time of NAV2 gradually decreases to 0 along with the transmission of data. After receiving the RTS message sent by the AP1, the STA1 queries CCA information to obtain the identifier of the AP2, the interference strength of the AP2, the remaining interference time of the AP2, and the interference strength of the internal interference of the channel, where the remaining interference time of the AP2 is the remaining time of the NAV 2.
If the CCA information indicates that the channel is interfered, the STA may determine whether to transmit a CCA report to the AP according to a time, included in the data transmission indication message, when the AP transmits data to the STA to occupy the channel. In another mode, the STA sends a CCA report to the AP only if the time for the AP to send the data occupied channel to the STA in the data transmission indication message is greater than a preset time threshold. This is mainly because, if the time for the AP to transmit data to the STA to occupy the channel, which is included in the data transmission indication message, is less than or equal to the time threshold, which indicates that the time required for the AP to transmit data to the STA is short, even if there is an interference source, the AP will not occupy too much resources to transmit data to the STA at a slow rate. If the STA sends the CCA report to the AP, the STA may occupy some resources due to sending the CCA report, even if a certain transmission resource is reduced according to the reported interference information, and the resource occupied by sending the CCA report is added, the total resource consumed in the two modes is almost the same, and therefore the STA does not need to send the CCA report to the AP.
Preferably, the time taken for the STA to send the CCA report to the AP is equal to the time taken for the STA to send the CTS message to the AP in the prior art, so as to ensure that the AP can initiate transmission within SIFS × 2+ CTS time after the RTS message transmission is finished.
Step 103, the AP determines N1 major interference sources and N2 minor interference sources from the N interference sources according to the interference intensities of the N interference sources, where the major interference source is an interference source with a higher interference intensity from the N interference sources, the minor interference source is an interference source with a lower interference intensity from 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 N1+ N2.
For example, there are three interference sources, interference strength of the interference source 1 and the interference source 2 is large, the influence on data transmission of the STA is large, interference strength of the interference source 3 is small, and the influence on data transmission of the STA is small, so that the AP determines that the interference source 1 and the interference source 2 are primary interference sources, and the interference source 3 is a secondary interference source. If there is only one interference source, the interference source is used as the main interference source, and the number of the secondary interference sources is zero.
And step 104, the AP calculates a first transmission rate used by the AP for transmitting data to be transmitted when the N interference sources and the internal interference exist simultaneously according to the acquired signal intensity on the channel, the interference intensities of the N interference sources and the interference intensity of the internal interference.
Specifically, the AP may calculate the first transmission rate according to a first formula, where the first formula is:
Figure GDA0002208787210000111
wherein R is1Representing a first transmission rate, S representing a signal strength, IiIndicates the interference strength of the ith dominant interferer, IrIndicating 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 strengths of the N interference sources, and the interference strength of the internal interference.
The AP may specifically obtain the signal strength in the following manner: the AP obtains the signal strength according to the received power obtained when the CCA report is received; alternatively, the AP receives the signal strength transmitted by the STA, which the STA obtains from the received power obtained when receiving the data transmission indication message.
And 105, the AP calculates a second transmission rate used by the AP for transmitting data to be transmitted 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 a rate after the interference of the main interference source is ended, specifically, the AP may calculate the second transmission rate according to a second formula, where the second formula is:
Figure GDA0002208787210000112
wherein R is2Indicating a second transmission rate, IjRepresenting the interference strength of the j-th secondary interferer. Alternatively, the AP may also sum the N2 secondary signals based on the acquired signal strengthAnd calculating the interference strength of the interference source by adopting a physical layer abstract method or other methods to calculate a second transmission rate.
Step 106, the AP transmits data to be transmitted 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, where the transmission time of the data to be transmitted is less than the transmission time required for the STA to transmit the data to be transmitted when the interference of the N interference sources exists.
In the first mode, the AP calculates a first transmission time according to the size of the data to be transmitted and a first transmission rate, where the first transmission time is a transmission time required for the STA to transmit the data to be transmitted under the interference of the main interference source. And calculating a second transmission time according to the size of the data to be transmitted and a second transmission rate, wherein the second transmission time is the transmission time required by the STA to transmit the data to be transmitted under the condition of not being interfered by the main interference source. Finally, the sum of the maximum remaining interference time for this second transmission and the N1 dominant interferers is calculated. For example, there are two dominant interferers, dominant interferer 1 has a remaining interference time of 1ms, dominant interferer 2 has a remaining interference time of 1.5ms, and then the maximum remaining interference time of dominant interferers 1, 2 is 1.5 ms.
If the first transmission time is greater than the sum of the second transmission time and the maximum remaining interference time of the N1 dominant interferers, the AP transmits data to be transmitted to the STA on the channel using the second transmission rate after the maximum remaining interference duration of the N1 dominant interferers is over. And if the first transmission time is less than or equal to the sum of the second transmission time and the residual interference duration of the main interference source, the AP transmits data to be transmitted to the STA by using the first transmission rate immediately after receiving the CCA report or after receiving the CCA report and the CTS message. 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 dominant interferers, it indicates that the AP starts to transmit the data to be transmitted at the first transmission rate of a lower rate according to the existing transmission method after receiving the CCA report, and the transmission can be completed earlier than that after the AP delays to the end of the maximum remaining interference time of the N1 dominant interferers and then transmits the data to be transmitted.
In the first mode, the AP transmits data at the second transmission rate after the maximum remaining interference time of N1 main interference sources, and can complete transmission of data to be transmitted more quickly, thereby improving the efficiency of data transmission and improving the utilization rate of wireless resources. Further, in order to improve the utilization rate of the wireless resources, the AP transmits data to other STAs on the channel using the first transmission rate before the maximum remaining interference time of the N1 dominant interferers is over.
In a second manner, the AP divides data to be transmitted into a first sub data segment and a second sub data segment, where 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 using a first transmission rate, and the AP transmits the second sub data segment to the STA on the channel using a second transmission rate.
Preferably, the transmission time of the first sub-data segment is greater than or equal to the maximum remaining interference time of N1 dominant interferers, that is, the AP transmits at the lower first transmission rate before the maximum remaining interference time of N1 dominant interferers is over, and transmits data at the faster second transmission rate after the maximum remaining interference time of N1 dominant interferers is over. Compared with the prior art that the data to be transmitted can only be transmitted at the first transmission rate, the AP can more quickly complete the transmission of the data to be transmitted, thereby improving the efficiency of data transmission and improving the utilization rate of wireless resources. Correspondingly, when the AP divides the data to be transmitted into the first sub-data segment and the second sub-data segment: the AP calculates the size of data which can be sent in the maximum residual interference time of the N1 main interference sources according to the first transmission rate and the maximum residual interference time of the N1 main interference sources, and divides the data to be sent into a first sub-data segment and a second sub-data segment according to the size of the data which can be sent in the maximum residual interference time of the N1 main interference sources, wherein the size of the first sub-data segment is larger than or equal to the size of the data which can be sent by the AP in the maximum residual interference time of the N1 main interference sources.
In this embodiment, the AP receives a CCA report of a channel returned by the STA, where the CCA report includes: the interference strength generated by each interference source in the N interference sources, the residual interference time of each interference source and the interference strength of the internal interference of the channel; and calculating a first transmission rate used by the STA when the STA is interfered by N1 main interference sources and a second transmission rate used by the STA when the STA is not interfered by N1 main interference sources according to the CCA report, and transmitting data to be transmitted to the STA on a channel according to the first transmission rate, the second transmission rate and the residual interference time of the N1 main interference sources, wherein the transmission time of the data to be transmitted is less than the transmission time required by the STA for transmitting the data to be transmitted when the STA is interfered by the N1 main interference sources. In the method, the AP transmits data according to the interference condition of the STA, so that the transmission time of the data to be transmitted is shorter than the transmission time required by the STA for transmitting the data to be transmitted under the interference of the main interference source, and the transmission of the data to be transmitted can be completed more quickly, 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 according to a second embodiment of the present invention, which is described from an STA side in this embodiment, as shown in fig. 4, the method of this embodiment may include the following steps:
step 201, the STA receives a data transmission indication message sent by the AP on the channel, where 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 an identifier of the STA and a time for the AP to send data to the STA to occupy the channel.
Step 202, the STA acquires 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, busy, or 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 data to be transmitted to the STA according to the CCA report, where the CCA report includes: the interference strength of the internal interference refers to the interference strength of the channel after the interference generated by the N interference sources is finished, and N is a positive integer greater than or equal to 1.
If the CCA information is used for indicating that the channel is free, the STA only returns a CTS message to the AP, and if the CCA information is used for indicating 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 a time required for the AP to send data to itself, which is carried in the data transmission indication message, is greater than a preset time threshold; if the time required by the AP to send data to the STA is more than the time threshold, the STA sends a CCA report to the AP; if the time required for the AP to send data to the AP is less than or equal to the time threshold, the STA does not return a CTS message to the AP. The reason is that, when the NAV is small, the transmission time for the AP to transmit data to the STA is short, and even if there is interference, too many resources are not occupied by low-rate transmission, but resources are also occupied by uploading a CCA state and the like, which reduces the utilization rate of the resources on the contrary.
The specific implementation manner of this embodiment may refer to the related description of step 102 of this embodiment, and is not described herein again.
In this embodiment, when the STA determines that the channel is interfered according to the CCA information, the STA returns a CCA report to the AP, where the CCA report carries information of interference received by the STA, so that the AP performs data transmission according to the interference received by the STA.
The method of example one and example two will be described below by way of specific examples. In this embodiment, a scenario shown in fig. 1 is taken as an example for explanation, fig. 5 is a flowchart of a data transmission method provided in a third embodiment of the present invention, fig. 6 is a schematic diagram of a scenario applicable to the third embodiment of the present invention, and fig. 6 includes two BSSs: referring to fig. 5 and fig. 6, the method provided in this embodiment may include the following steps:
step 301, the AP1 performs channel contention.
Step 302, the AP1 sends a data transmission indication message to the STA1 on the contended channel.
The STA1 returns a data transmission response message to the STA according to the data transmission indication message.
Step 303, the AP1 receives a data transmission response message returned by the STA1, where the data transmission response message includes a CCA report, and the CCA report includes the identity of the interference source AP2, the interference strength of the interference source AP2, the remaining interference time of the AP2, and the interference strength of the internal interference.
The data transmission response message may further include a CTS message.
Step 304, AP1 calculates a first transmission rate based on the signal strength, the interference strength of the interferer AP2, and the interference strength of the internal interference.
The specific implementation manner of steps 302-304 can refer to the description of the first embodiment, and is not described herein again.
Step 305, the AP1 calculates a first transmission time based on the size of the data to be transmitted and the first transmission rate.
Assume that the first transmission rate is R1When the size of data to be transmitted is L, the first transmission time
Figure GDA0002208787210000131
Step 306, the AP1 calculates a second transmission rate based on the signal strength and the interference strength of the internal interference.
The specific implementation manner of this step may refer to the description related to the first embodiment, and is not described herein again.
Step 307, the AP1 calculates a second transmission time according to the size of the data to be transmitted and the second transmission rate.
Assume that the second transmission rate is: r2Size of data to be transmitted L, second Transmission time
Figure GDA0002208787210000132
Step 308, the AP1 determines whether the first transmission time is greater than the sum of the second transmission time and the remaining interference time of the interference source AP 2.
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, step 309 is executed, and 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, step 310 is executed.
In step 309, after the remaining interference time of the interference source AP2 is over, the AP1 transmits data to be transmitted to the STA1 at the second transmission rate on the channel.
Optionally, the AP1 transmits data to other STAs before the end of the remaining interference duration of the dominant interferer AP 2.
In step 310, the AP1 transmits data to be transmitted to the STA1 on the channel at the first transmission rate after receiving the data transmission response and after an interval SIFI.
Fig. 7 is a diagram illustrating data transmission by using a method in the prior art, fig. 8 is a diagram illustrating data transmission by using a method in accordance with the third embodiment, and comparing fig. 7 with fig. 8, before and after the remaining interference time of the interference source AP2 in fig. 7 is over, the AP1 transmits data to be transmitted to the STA1 by using a first transmission rate with a lower rate, and the required first transmission time T1 is as shown in fig. 1. In the method of this embodiment, data is not transmitted to the STA1 before the remaining interference time of the interference source AP2 is over, but after the remaining interference time of the interference source AP2 is over, data to be transmitted is transmitted to the STA1 using the second transmission rate on the channel, the time required for transmitting the data to be transmitted using the second transmission rate is T2, then, the time (i.e., the remaining interference time of the interference source AP 2) that the STA1 waits is added to obtain the time T3 required for the STA1 to transmit the data to be transmitted, by comparing fig. 7 with fig. 2
Fig. 8 shows that T3 is smaller than T1, so that the method of the present embodiment can complete transmission in a shorter time, thereby improving the utilization rate of resources.
Fig. 9 is a schematic structural diagram of a method according to a fourth embodiment of the present invention, and this embodiment takes the scenario shown in fig. 6 as an example for description, and with reference to fig. 6 and fig. 9, the method according to this embodiment may include the following steps:
step 401, the AP1 performs channel contention.
Step 402, the AP1 sends a channel transmission indication message to the STA1 on the contended channel.
The STA1 returns a data transmission response message to the STA according to the data transmission indication message.
In step 403, the AP1 receives a data transmission response message returned by the STA1, where the data transmission response message includes a CCA report, and the report includes the identity of the interference source AP2, the interference strength of the interference source AP2, the remaining interference time of the AP2, and the interference strength of the internal interference.
The data transmission response message may further include a CTS message.
Step 404, AP1 calculates a first transmission rate based on the signal strength, the interference strength of the interferer AP2, and the interference strength of the internal interference.
The specific implementation manner of steps 402-404 can refer to the description of the first embodiment, and is not described herein again.
Step 405, the AP1 calculates a second transmission rate based on the signal strength and the interference strength of the internal interference.
And step 406, the AP1 divides the data to be transmitted into a first sub data segment and a second sub data segment, where the transmission time of the first sub data segment is equal to the remaining interference time of the interference source AP 2.
Step 407, the AP1 transmits the first sub data segment to the STA1 on the channel at the first transmission rate before the end of the remaining interference time of the interference source AP2, and transmits the second sub data segment to the STA1 on the channel at the second transmission rate after the end of the remaining interference time of the interference source AP 2.
The specific implementation manner of steps 402-407 can refer to the related description of the first embodiment, and is not described herein again.
Fig. 10 is a schematic diagram of data transmission by using the method in the fourth embodiment, and comparing fig. 7 and fig. 10, in fig. 7, before and after the residual interference time of the interference source AP2 ends, the AP1 transmits data to be transmitted to the STA1 by using the first transmission rate at a lower rate, in the method in this embodiment, before the residual interference time of the interference source AP2 ends, the AP1 transmits the first sub data segment to the STA1 by using the first transmission rate, and after the residual interference duration of the interference source AP2 ends, the AP2 transmits the second sub data segment to the STA1 by using the second transmission rate, and since the second transmission rate is higher than the first transmission rate, compared with the prior art, the method in this embodiment shortens the data transmission time.
It should be noted that the method of the present invention may also be applied to a multi-user scenario, where in the multi-user scenario, the AP may carry, in one data transmission indication message, the identifiers of multiple STAs and the time required for the AP to transmit data to each STA, where the multiple STAs use channels of different frequencies. Multiple STAs may send CCA reports to the AP using Orthogonal Frequency Division Multiple Access (OFDMA), for example, Multiple APs may send CCA reports to the AP on different subcarriers, and if the channel condition is good, Multiple STAs may send CTS messages in a non-HT compatible format on the same subcarrier. Fig. 11 is a schematic diagram illustrating a plurality of STAs sending data transmission response messages to an AP, where in fig. 11, the plurality of STAs first send CCA reports on a plurality of uplink subcarriers by using OFDMA technology, 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 included in the CCA report indicates that STA1 receives persistent strong interference, the AP does not transmit to STA1 for subsequent data transmissions, but transmits for other users.
Fig. 12 is another diagram illustrating a plurality of STAs transmitting data transmission response messages to an AP. In fig. 12, multiple STAs first transmit a CTS message and then transmit CCA reports on multiple subcarriers using OFDMA techniques.
The data transmission response messages in fig. 11 and 12 both include a CCA report and a CTS message. Fig. 13 is a diagram illustrating a data transmission response message sent by a plurality of STAs to an AP, where the data transmission response message in fig. 13 only includes a CCA report.
Fig. 14 is a schematic structural diagram of an AP according to a fifth embodiment of the present invention, and as shown in fig. 14, the AP according to the present embodiment includes: a sending module 11, a receiving module 12 and a processing module 13.
A sending module 11, configured to send a data transmission indication message to an STA on a channel, where 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 an identifier of the STA and a time occupied by the AP to send data to the STA on the channel;
a receiving module 12, configured to receive a clear channel assessment CCA report of the channel returned by the STA according to the data transmission indication message, where the CCA report includes: 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 is finished, and N is a positive integer greater than or equal to 1;
a processing module 13, configured to determine, according to interference strengths of the N interference sources, N1 primary interference sources and N2 secondary interference sources from the N interference sources, where the primary interference source is an interference source with a higher interference strength among the N interference sources, the secondary interference source is an interference source with a lower interference strength 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 N1+ N2;
the processing module 13 is further configured to calculate, according to the acquired signal strength on the channel, the interference strengths of the N interference sources, and the interference strength of the internal interference, a first transmission rate used by the AP to transmit data to be transmitted when the N interference sources and the internal interference exist at the same time;
the processing module 13 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, a second transmission rate used by the AP to transmit the data to be transmitted when the N2 secondary interference sources and the internal interference exist simultaneously;
the processing module 13 is further configured to transmit the data to be transmitted 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, where the data transmission time to be transmitted is less than the transmission time required by the STA to transmit the data to be transmitted when the interference of 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:
Figure GDA0002208787210000161
wherein R is1Representing said first transmission rate, S representing said signal strength, IiRepresenting the interference strength, I, of the I-th dominant interfererrRepresenting the interference strength of the internal interference.
Optionally, the processing module 13 calculates the second transmission rate according to a second formula, where the second formula is:
Figure GDA0002208787210000162
wherein R is2Representing said second transmission rate, IjRepresenting the interference strength of the j-th secondary interferer.
In this embodiment, the receiving module 12 is further configured to: obtaining the signal strength according to the received power obtained when the CCA report is received; or, receiving the signal strength sent by the STA, where the signal strength is obtained by the STA according to the received power obtained when the data transmission indication message is received.
Optionally, a time taken for the STA to send the CCA report to the AP is equal to a time taken for the STA to send a clear to send CTS message to the AP.
Optionally, the data transmission indication message further includes: and clearing indication information of sending the CTS message, wherein the indication information is used for indicating whether the STA returns the CTS message to the AP or not.
The AP of this embodiment may be configured to execute the method of the first embodiment, and the specific implementation manner and the technical effect are similar, which are not described herein again.
An AP is provided in a sixth embodiment of the present invention, and with reference to fig. 14, on the basis of the AP provided in the fifth embodiment, in this embodiment, the processing module 13 transmits the data to be transmitted 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, specifically: calculating first transmission time according to the size of the data to be transmitted and the first transmission rate; calculating a second transmission time according to the size of the data to be transmitted 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 dominant interferers, after the maximum remaining interference duration of the N1 dominant interferers is over, transmitting the data to be transmitted to the STA on the channel using the second transmission rate.
Optionally, the sending module is further configured to: and transmitting data to other STAs on the channel by using the first transmission rate before the maximum residual interference time of the N1 main interference source is ended.
The AP of this embodiment may be used to execute the method of the third embodiment, and the specific implementation manner and the technical effect are similar, which are not described herein again.
A seventh embodiment of the present invention provides an AP, where in the structure of the AP provided in this embodiment, referring to fig. 14, on the basis of the AP provided in the fifth embodiment, in this embodiment, the processing module 13 transmits the data to be transmitted 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, where specifically: dividing the data to be sent into a first sub data segment and a second sub data segment, wherein the first sub data segment is transmitted before the second sub data segment; and 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.
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, which specifically includes: calculating the size of data which can be transmitted in 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; dividing the data to be transmitted into the first sub data segment and the second sub data segment according to the size of the data capable of being transmitted in the maximum remaining interference time of the N1 main interference sources, where the size of the first sub data segment is greater than or equal to the size of the data capable of being transmitted in the maximum remaining interference time of the N1 main interference sources by the AP.
The AP of this embodiment may be configured to execute the method of the fourth embodiment, and the specific implementation manner and the technical effect are similar, which are not described herein again.
Fig. 15 is a schematic structural diagram of an STA according to an eighth embodiment of the present invention, and as shown in fig. 15, the STA according to the present embodiment includes: a receiving module 21, an obtaining module 22 and a sending module 23.
A receiving module 21, configured to receive a data transmission indication message sent by an AP on a channel, where 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 an identifier of the STA and a time occupied by the AP to send data to the STA on the channel;
an obtaining module 22, configured to obtain, according to the data transmission indication message, clear channel assessment CCA information of the channel, where the CCA information is used to indicate that the channel is clear, 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 to-be-sent data to the STA according to the CCA report, where the CCA report includes: 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 is ended, and N is a positive integer greater than or equal to 1.
Optionally, the STA further includes: a determining module, configured to determine whether a time that the AP sends data to the STA and occupies the channel, which is included in the data transmission indication message, is greater than a preset time threshold before the sending module 23 sends the CCA report to the AP; if the time for the AP to send data to the STA to occupy the channel, which is included in the data transmission indication message, is greater than the time threshold, determining to send the CCA report to the AP; and if the time for the AP to send the data to the STA to occupy the channel, which is included in the data transmission indication message, is less than or equal to the time threshold, determining to return a CTS message to the AP.
Optionally, the data transmission indication message further includes: indication information of a CTS message, wherein the indication information is used for indicating whether the STA returns the CTS message to the AP or not; if the indication information is used to indicate that the STA returns a CTS message to the AP, the sending module is further configured to: transmitting a CTS message to the AP before or after transmitting the CCA report to the AP.
The STA of this embodiment may be configured to execute the method provided in the second embodiment, and the specific implementation manner and the technical effect are similar, which are not described herein again.
Fig. 16 is a schematic structural diagram of an AP according to a ninth embodiment of the present invention, and as shown in fig. 16, an AP300 provided in this embodiment includes: a processor 31, a memory 32, a communication interface 33 and a system bus 34, wherein the memory 32 and the communication interface 33 are connected to the processor 31 through the system bus 34 and perform communication with each other, the memory 32 is used for storing computer-executable instructions, the communication interface 33 is used for communicating with other devices, and the processor 31 is used for executing the computer-executable instructions to make the AP300 perform the following methods:
sending a data transmission indication message to an STA on a channel, wherein the data transmission indication message is used for informing the STA that the AP has data to send to the STA, and the data transmission indication message comprises an identification of the STA and time of the AP sending data to the STA to occupy the channel;
receiving a Clear Channel Assessment (CCA) report of the channel returned by the STA according to the data transmission indication message, wherein the CCA report comprises: 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 is finished, and N is a positive integer greater than or equal to 1;
determining, according to the interference strengths of the N interference sources, N1 primary interference sources and N2 secondary interference sources from the N interference sources, where the primary interference source is an interference source with a higher interference strength from the N interference sources, the secondary interference source is an interference source with a lower interference strength from 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 N1+ N2;
calculating a first transmission rate used by the AP for transmitting data to be transmitted when the N interference sources and the internal interference exist simultaneously according to the acquired signal intensity on the channel, the interference intensities of the N interference sources and the interference intensity of the internal interference;
calculating a second transmission rate used by the AP to transmit the data to be transmitted 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;
and transmitting the data to be transmitted 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, where the data transmission time to be transmitted is less than the transmission time required for the STA to transmit the data to be transmitted when the interference of the N interference sources exists.
Optionally, the processor 31 transmits the data to be transmitted 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, specifically: calculating first transmission time according to the size of the data to be transmitted and the first transmission rate; calculating a second transmission time according to the size of the data to be transmitted 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 dominant interferers, after the maximum remaining interference duration of the N1 dominant interferers is over, transmitting the data to be transmitted to the STA on the channel using the second transmission rate.
Optionally, the processor 31 is further configured to: and transmitting data to other STAs on the channel by using the first transmission rate before the maximum residual interference time of the N1 main interference source is ended.
Optionally, the processor 31 transmits the data to be transmitted 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, specifically: dividing the data to be sent into a first sub data segment and a second sub data segment, wherein the first sub data segment is transmitted before the second sub data segment; and the AP transmits 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: calculating the size of data which can be transmitted in 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; dividing the data to be transmitted into the first sub data segment and the second sub data segment according to the size of the data which can be transmitted by the AP within the maximum remaining interference time of the N1 main interference sources, wherein the size of the first sub data segment is greater than or equal to the size of the data which can be transmitted by the AP within the maximum remaining interference time of the N1 main interference sources.
Optionally, the processor 31 calculates the first transmission rate according to a first formula, where the first formula is:
Figure GDA0002208787210000191
wherein R is1Representing said first transmission rate, S representing said signal strength, IiRepresenting the interference strength, I, of the I-th dominant interfererrRepresenting the interference strength of the internal interference.
Optionally, the processor 31 calculates the second transmission rate according to a second formula, where the second formula is:
Figure GDA0002208787210000192
wherein R is2Representing said second transmission rate, IjRepresenting the interference strength of the j-th secondary interferer.
In this embodiment, the processor 31 is further configured to: obtaining the signal strength according to the received power obtained when the CCA report is received; or, receiving the signal strength sent by the STA, where the signal strength is obtained by the STA according to the received power obtained when the data transmission indication message is received.
Optionally, a time taken for the STA to send the CCA report to the AP is equal to a time taken for the STA to send a clear to send CTS message to the AP.
Optionally, the data transmission indication message further includes: and clearing indication information of sending the CTS message, wherein the indication information is used for indicating whether the STA returns the CTS message to the AP or not.
The AP of this embodiment may be configured to execute the methods provided in the first embodiment, the third embodiment, and the fourth embodiment, and specific implementation manners and technical effects are similar and will not be described herein again.
Fig. 17 is a schematic structural diagram of an STA according to a tenth embodiment of the present invention, and as shown in fig. 17, an STA400 according to the present embodiment includes: a processor 41, a memory 42, a communication interface 43 and a system bus 44, where the memory 42 and the communication interface 43 are connected to the processor 41 through the system bus 44 and complete communication therebetween, the memory 42 is used to store computer-executable instructions, the communication interface 43 is used to communicate with other devices, and the processor 41 is used to execute the computer-executable instructions, so that the STA400 executes the following methods:
receiving a data transmission indication message sent by an AP (access point) on a channel, wherein the data transmission indication message is used for informing the STA that the AP has data to send to the STA, and the data transmission indication message comprises an identification of the STA and time of the AP sending the data to the STA to occupy the channel;
acquiring Clear Channel Assessment (CCA) information of the channel according to the data transmission indication message, wherein the CCA information is used for indicating that the channel is clear, the channel is busy or the channel is interfered;
if the CCA information indicates that the channel is interfered, sending the CCA report to the AP, so that the AP transmits the data to be sent to the STA according to the CCA report, where the CCA report includes: 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 is ended, 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: determining whether the time of the AP sending data to the STA to occupy the channel, which is included in the data transmission indication message, is greater than a preset time threshold; if the time for the AP to send data to the STA to occupy the channel, which is included in the data transmission indication message, is greater than the time threshold, determining to send the CCA report to the AP; and if the time for the AP to send the data to the STA to occupy the channel, which is included in the data transmission indication message, is less than or equal to the time threshold, determining 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, wherein the indication information is used for indicating whether the STA returns the CTS message to the AP or not; if the indication information is used to indicate that the STA returns a CTS message to the AP, the processor 41 is further configured to: transmitting a CTS message to the AP before or after transmitting the CCA report to the AP.
The STA of this embodiment may be configured to execute the method provided in the second embodiment, and the specific implementation manner and the technical effect are similar, which are not described herein again.
Those of ordinary skill in the art will understand that: all or part of the steps for implementing the method embodiments may be implemented by hardware related to program instructions, and the program may be stored in a computer readable storage medium, and when executed, the program performs the steps including the method embodiments; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (26)

1. A method of data transmission, comprising:
an Access Point (AP) sends a data transmission indication message to a Station (STA) on a channel, wherein the data transmission indication message is used for informing the STA that the AP has data to send to the STA, and the data transmission indication message comprises an identification of the STA and time of the AP sending data to the STA to occupy the channel;
the AP receives a Clear Channel Assessment (CCA) report of the channel returned by the STA according to the data transmission indication message, wherein the CCA report comprises: 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 is finished, and 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 intensity of the N interference sources, wherein the main interference source is one of the N interference sources with higher interference intensity, the secondary interference source is one of the N interference sources with lower interference intensity, N1 is a positive integer greater than or equal to 1, N2 is a positive integer greater than or equal to 0, and N1+ N2;
the AP calculates a first transmission rate used by the AP for transmitting data to be transmitted when the N interference sources and the internal interference exist simultaneously according to the acquired signal intensity on the channel, the interference intensities of the N interference sources and the interference intensity of the internal interference;
the AP calculates a second transmission rate used by the AP for transmitting the data to be transmitted 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;
and the AP transmits the data to be transmitted to the STA on the channel according to the first transmission rate, the second transmission rate and the residual interference time of the N1 main interference sources, wherein the transmission time of the data to be transmitted is less than the transmission time required by the STA for transmitting the data to be transmitted when the interference of the N interference sources exists.
2. The method of claim 1, wherein the AP transmits the data to be transmitted to the STA on the channel according to the first transmission rate, the second transmission rate and the remaining interference times of the N1 dominant interferers, comprising:
the AP calculates first transmission time according to the size of the data to be transmitted and the first transmission rate;
the AP calculates a second transmission time according to the size of the data to be transmitted 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 dominant interferers, the AP transmits the data to be transmitted to the STA on the channel using the second transmission rate after the maximum remaining interference duration of the N1 dominant interferers is over.
3. The method of claim 2, further comprising:
and the AP sends data to other STAs on the channel by using the first transmission rate before the maximum residual interference time of the N1 main interference source is ended.
4. The method of claim 1, wherein the AP transmits the data to be transmitted to the STA on the channel according to the first transmission rate, the second transmission rate and the remaining interference times of the N1 dominant interferers, comprising:
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;
and the AP transmits the first sub data segment to the STA on the channel by using the first transmission rate, and transmits the second sub data segment to the STA on the channel by using the second transmission rate.
5. The method of claim 4, wherein the AP dividing the data to be transmitted into a first sub-data segment and a second sub-data segment comprises:
the AP calculates the size of data which can be transmitted in the maximum residual interference time of the N1 main interference sources according to the first transmission rate and the maximum residual interference time of the N1 main interference sources;
the AP divides the data to be transmitted into the first sub data segment and the second sub data segment 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, where the size of the first sub data segment is greater than or equal 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.
6. The method according to any one of claims 1-5, wherein the AP calculates a first transmission rate used by the AP for transmitting the data to be transmitted when the N interference sources and the internal interference exist simultaneously according to the acquired signal strength, the interference strengths of the N interference sources, and the interference strength of the internal interference, and comprises:
the AP calculates the first transmission rate according to a first formula, which is:
Figure FDA0002386567430000021
wherein R is1Representing said first transmission rate, S representing said signal strength, IiIndicates the interference strength of the ith dominant interferer, IrRepresenting an interference strength of the internal interference;
the AP calculates a second transmission rate used by the AP for transmitting the data to be transmitted 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, and the method comprises the following steps:
the AP calculates the second transmission rate according to a second formula, where the second formula is:
Figure FDA0002386567430000022
wherein R is2Representing said second transmission rate, IjRepresenting the interference strength of the j-th secondary interferer.
7. The method of claim 1, further comprising:
the AP obtains the signal strength according to the received power obtained when the CCA report is received;
or, 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 the data transmission indication message is received.
8. The method of claim 1 wherein the time it takes for the STA to transmit the CCA report to the AP is equal to the time it takes for the STA to transmit a clear to send, CTS, message to the AP.
9. The method of claim 1, wherein the data transmission indication message further comprises: and clearing indication information of sending the CTS message, wherein the indication information is used for indicating whether the STA returns the CTS message to the AP or not.
10. A method of data transmission, comprising:
a Station (STA) receives a data transmission indication message sent by an Access Point (AP) on a channel, wherein the data transmission indication message is used for informing the STA that the AP has data to send to the STA, and the data transmission indication message comprises an identification of the STA and time of the AP sending the data to the STA to occupy the channel;
the STA acquires Clear Channel Assessment (CCA) information of the channel according to the data transmission indication message, wherein the CCA information is used for indicating that the channel is clear, 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, where the CCA report includes: 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 is finished, and N is a positive integer greater than or equal to 1; enabling the AP to determine, according to interference strengths of N interference sources in the CCA report, N1 primary interference sources and N2 secondary interference sources, where the primary interference source is an interference source with a higher interference strength among the N interference sources, the secondary interference source is an interference source with a lower interference strength 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 N1+ N2; the AP calculates a first transmission rate used by the AP for transmitting data to be transmitted when the N interference sources and the internal interference exist simultaneously according to the acquired signal intensity on the channel, the interference intensity of the N interference sources and the interference intensity of the internal interference in the CCA report; the AP calculates a second transmission rate used by the AP for transmitting the data to be transmitted 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; and the AP transmits the data to be transmitted to the STA on the channel according to the first transmission rate, the second transmission rate and the residual interference time of the N1 main interference sources, wherein the transmission time of the data to be transmitted is less than the transmission time required by the STA for transmitting the data to be transmitted when the interference of the N interference sources exists.
11. The method of claim 10, wherein before the STA transmits the CCA report to the AP, the method further comprises:
the STA determines whether the time of the channel occupied by the data transmitted by the AP to the STA in the data transmission indication message is greater than a preset time threshold;
if the time for the AP to send data to the STA to occupy the channel, which is included in the data transmission indication message, is greater than the time threshold, the STA determines to send the CCA report to the AP;
and if the time for the AP to send the data to the STA to occupy the channel, which is 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.
12. The method according to claim 10, wherein the data transmission indication message further comprises: clearing indication information of sending a CTS message, wherein the indication information is used for indicating whether the STA returns the CTS message to the AP or not;
if the indication information is used to indicate that the STA returns a CTS message to the AP, the method further includes:
the STA sending a CTS message to the AP before or after sending the CCA report to the AP.
13. An access point, AP, comprising:
a sending module, configured to send a data transmission indication message to a station STA on a channel, where 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 an identifier of the STA and a time that the AP sends data to the STA and occupies the channel;
a receiving module, configured to receive a clear channel assessment CCA report of the channel returned by the STA according to the data transmission indication message, where the CCA report includes: 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 is finished, and N is a positive integer greater than or equal to 1;
a processing module, configured to determine, according to interference strengths of the N interference sources, N1 primary interference sources and N2 secondary interference sources from the N interference sources, where the primary interference source is an interference source with a higher interference strength among the N interference sources, the secondary interference source is an interference source with a lower interference strength 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 N1+ N2;
the processing module is further configured to calculate, according to the acquired signal strength on the channel, the interference strengths of the N interference sources, and the interference strength of the internal interference, a first transmission rate used by the AP to transmit data to be transmitted when the N interference sources and the internal interference coexist;
the processing module is further configured to calculate, according to the signal strength, the interference strengths of the N2 secondary interference sources, and the interference strength of the internal interference, a second transmission rate used by the AP to transmit the data to be transmitted when the N2 secondary interference sources and the internal interference exist simultaneously;
the processing module is further configured to transmit the data to be transmitted 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, where the data transmission time to be transmitted is less than transmission time required for the STA to transmit the data to be transmitted when the interference of the N interference sources exists.
14. The AP of claim 13, wherein the processing module transmits the data to be transmitted to the STA on the channel according to the first transmission rate, the second transmission rate, and the remaining interference times of the N1 dominant interferers, specifically:
calculating first transmission time according to the size of the data to be transmitted and the first transmission rate;
calculating a second transmission time according to the size of the data to be transmitted 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 dominant interferers, after the maximum remaining interference duration of the N1 dominant interferers is over, transmitting the data to be transmitted to the STA on the channel using the second transmission rate.
15. The AP of claim 14, wherein the sending module is further configured to:
and transmitting data to other STAs on the channel by using the first transmission rate before the maximum residual interference time of the N1 main interference source is ended.
16. The AP of claim 13, wherein the processing module transmits the data to be transmitted to the STA on the channel according to the first transmission rate, the second transmission rate, and the remaining interference times of the N1 dominant interferers, specifically:
dividing the data to be sent into a first sub data segment and a second sub data segment, wherein the first sub data segment is transmitted before the second sub data segment;
and 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.
17. The AP of 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:
calculating the size of data which can be transmitted in 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;
dividing the data to be transmitted into the first sub data segment and the second sub data segment according to the size of the data capable of being transmitted in the maximum remaining interference time of the N1 main interference sources, where the size of the first sub data segment is greater than or equal to the size of the data capable of being transmitted in the maximum remaining interference time of the N1 main interference sources by the AP.
18. The AP according to any one of claims 13 to 17, wherein the processing module calculates, according to the obtained signal strength, the interference strengths of the N interference sources, and the interference strength of the internal interference, a first transmission rate used by the AP to transmit the data to be transmitted when the N interference sources and the internal interference exist simultaneously, specifically:
calculating the first transmission rate according to a first formula, wherein the first formula is as follows:
Figure FDA0002386567430000051
wherein R is1Representing said first transmission rate, S representing said signal strength, IiIndicates the interference strength of the ith dominant interferer, IrRepresenting an interference strength of the internal interference;
the processing module calculates, according to the signal strength, the interference strengths of the N2 secondary interference sources, and the interference strength of the internal interference, a second transmission rate used by the AP to transmit the data to be transmitted when the N2 secondary interference sources and the internal interference coexist, specifically:
calculating the second transmission rate according to a second formula, the second formula being:
Figure FDA0002386567430000052
wherein R is2Representing said second transmission rate, IjRepresenting the interference strength of the j-th secondary interferer.
19. The AP of claim 13, wherein the receiving module is further configured to:
obtaining the signal strength according to the received power obtained when the CCA report is received;
or, receiving the signal strength sent by the STA, where the signal strength is obtained by the STA according to the received power obtained when the data transmission indication message is received.
20. The AP of claim 13 wherein the time it takes for the STA to send the CCA report to the AP is equal to the time it takes for the STA to send a clear to send, CTS, message to the AP.
21. The AP of claim 13, wherein the data transmission indication message further comprises: and clearing indication information of sending the CTS message, wherein the indication information is used for indicating whether the STA returns the CTS message to the AP or not.
22. A Station (STA), comprising:
a receiving module, configured to receive, on a channel, a data transmission indication message sent by an access point AP, where 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 an identifier of the STA and a time that the AP sends data to the STA and occupies the channel;
an obtaining module, configured to obtain, according to the data transmission indication message, CCA information for evaluating a clear channel of the channel, where the CCA information is used to indicate that the channel is clear, 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, where the CCA report includes: 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 is finished, and N is a positive integer greater than or equal to 1; enabling the AP to determine, according to interference strengths of N interference sources in the CCA report, N1 primary interference sources and N2 secondary interference sources, where the primary interference source is an interference source with a higher interference strength among the N interference sources, the secondary interference source is an interference source with a lower interference strength 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 N1+ N2; the AP calculates a first transmission rate used by the AP for transmitting data to be transmitted when the N interference sources and the internal interference exist simultaneously according to the acquired signal intensity on the channel, the interference intensity of the N interference sources and the interference intensity of the internal interference in the CCA report; the AP calculates a second transmission rate used by the AP for transmitting the data to be transmitted 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; and the AP transmits the data to be transmitted to the STA on the channel according to the first transmission rate, the second transmission rate and the residual interference time of the N1 main interference sources, wherein the transmission time of the data to be transmitted is less than the transmission time required by the STA for transmitting the data to be transmitted when the interference of the N interference sources exists.
23. The STA of claim 22, further comprising:
a determining module, configured to determine whether a time that the AP sends data to the STA and occupies the channel, which is included in the data transmission indication message, is greater than a preset time threshold before the sending module sends the CCA report to the AP;
if the time for the AP to send data to the STA to occupy the channel, which is included in the data transmission indication message, is greater than the time threshold, determining to send the CCA report to the AP;
and if the time for the AP to send the data to the STA to occupy the channel, which is included in the data transmission indication message, is less than or equal to the time threshold, determining to return a clear-to-send (CTS) message to the AP.
24. The STA of claim 22, wherein the data transmission indication message further comprises: clearing indication information of sending a CTS message, wherein the indication information is used for indicating whether the STA returns the CTS message to the AP or not;
if the indication information is used to indicate that the STA returns a CTS message to the AP, the sending module is further configured to:
transmitting a CTS message to the AP before or after transmitting the CCA report to the AP.
25. An access point, AP, comprising: the AP comprises a processor, a memory, a communication interface and a system bus, wherein the memory and the communication interface are connected with the processor through the system bus and are used for realizing mutual communication, the memory is used for storing computer execution instructions, the communication interface is used for communicating with other equipment, and the processor is used for operating the computer execution instructions to enable the AP to execute the method according to any one of claims 1-9.
26. A Station (STA), comprising: the STA comprises a processor, a memory, a communication interface and a system bus, wherein the memory and the communication interface are connected with the processor through the system bus and are used for realizing mutual communication, the memory is used for storing computer execution instructions, the communication interface is used for communicating with other equipment, and the processor is used for operating the computer execution instructions to enable the STA to execute the method according to any one of claims 10-12.
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