CN105812295B

CN105812295B - Data transmission method and station

Info

Publication number: CN105812295B
Application number: CN201410843313.3A
Authority: CN
Inventors: 杨柳; 孙波; 吕开颖; 方永刚; 张力
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2014-12-30
Filing date: 2014-12-30
Publication date: 2020-05-12
Anticipated expiration: 2034-12-30
Also published as: CN105812295A; WO2016107358A1

Abstract

The invention provides a data transmission method and a site. Relates to the field of communications; the problem of loop nesting in the dynamic CCA channel detection threshold technology is solved. The method comprises the following steps: when the station receives the whole or part of the wireless frame, the station uses the channel idle detection parameter set to perform channel idle detection according to the analyzed address information, BSS attribution information and multiplexing transmission indication information; when the station sends a wireless frame, multiplexing transmission indication information is generated according to the result of channel idle detection, and the multiplexing transmission indication information and BSS attribution information of the station are carried in the wireless frame sent by the station to indicate whether other stations are allowed to carry out channel multiplexing transmission. The technical scheme provided by the invention is suitable for the WLAN network, and realizes the prevention of the occurrence of loop nesting.

Description

Data transmission method and station

Technical Field

The present invention relates to the field of communications, and in particular, to a data transmission method and a station based on dynamic channel detection.

Background

At present, the use of WLANs for data communication is widespread, and there is an increasing global demand for WLAN coverage. The institute of electrical and electronics engineers industry specification IEEE802.11 group has defined a series of standards such as 802.11a/b/g/n/ac in order to meet the ever-increasing communication demands. The dynamic channel detection threshold is an alternative technology for improving the channel multiplexing rate and solving the network efficiency, and has attracted extensive attention and research.

In a conventional WLAN network, an Access Point (AP) and a plurality of Stations (STAs) associated with the AP may form a Basic Service Set (BSS), and a plurality of BSSs cover a partial Overlapping (OBSS) as shown in fig. 1. Currently, 802.11 supports two methods for determining whether a channel is idle, namely physical carrier detection and virtual carrier detection. The physical carrier detection refers to a Clear Channel Assessment (CCA) Channel detection technology, and the associated station determines whether a Channel is busy or idle by detecting the signal strength on the medium. On a 20MHz channel, when the received signal is determined to be an 802.11 signal and greater than-82 dBm, the channel is considered busy. And virtual carrier detection means that a third party except both communication parties associates a site, and when a received wireless frame with a receiving address different from that of the third party is received, local channel protection reservation time is set according to transmission time indication in the frame. The channel protection reservation time may be a value of a local Network Allocation Vector (NAV) or a BSS Response indication delay timer (BSS RID timer). When the NAV or response indicates that the delay timer is not zero, the channel is considered busy and no contention transmission is performed. Only when the physical carrier detection and the virtual carrier detection judge that the channel is idle, the associated station can perform contention access channel transmission.

Conventionally, CCA channel detection techniques all use a fixed threshold as a criterion for determining that a channel is busy, which reduces access opportunities for the channel in some scenarios. As shown in fig. 2, STA1 is associated with AP1 and STA2 is associated with AP2, indicating the received signal strength between them. When STA1 transmits to AP1, STA2 receives the signal of STA1, and the signal strength is higher than-82 dBm, according to the CCA detection technique with a fixed threshold, STA2 may determine that the channel is busy, but in fact STA2 transmits a signal to AP2, because the signal strength from STA2 to AP1 is far lower than the signal strength from STA1 to AP1, no interference may be caused to the reception of AP1, and AP2 may successfully receive the signal of STA 2. Clearly, a too low CCA threshold reduces the transmission opportunity of STA 2.

Based on the above analysis, the CCA threshold may be configured more flexibly for more efficient channel multiplexing. While the use of a variable detection threshold for channel detection can increase transmission opportunities, the use of a variable detection threshold can be problematic. For example, there is another STA3 in fig. 2 that supports the dynamic CCA technique, associated with AP 1. When STA1 communicates with AP1, STA2 supports the dynamic CCA technique, raises its CCA detection threshold, multiplexes the segment of the transmission opportunity contention channel, and sends a signal to AP 2. At the same time, STA3 also satisfies the condition of multiplexing STA2 and AP2 communication opportunities, STA3 continues to raise the CCA threshold in anticipation of obtaining a multiplexed transmission opportunity, and in so doing, evolves to the round-robin nesting problem. However, in the related art, there is no effective solution for how to solve the problem of loop nesting in the dynamic CCA channel detection threshold technology.

Disclosure of Invention

The invention provides a data transmission method and a station, which solve the problem of loop nesting in a dynamic CCA channel detection threshold technology.

A method of data transmission, comprising:

when a station receives the whole or part of wireless frames, channel idle detection is carried out by using a channel idle detection parameter set according to the analyzed address information, Basic Service Set (BSS) attribution information and multiplexing transmission indication information;

when the station sends a wireless frame, multiplexing transmission indication information is generated according to the result of channel idle detection, and the multiplexing transmission indication information and BSS attribution information of the station are carried in the wireless frame sent by the station to indicate whether other stations are allowed to carry out channel multiplexing transmission.

Preferably, when the result of the channel idle detection is that the channel is idle, the station multiplexes the remaining transmission time of the received wireless frame to transmit data;

and when the channel idle detection result is that the channel is busy, the station continuously detects the channel until the channel is idle, and then competitively accesses the channel and sends a wireless frame.

Preferably, the address indicated by the address information of the wireless frame received by the station is different from the address of the station.

Preferably, the BSS home information includes any one or any plurality of the following information:

COLOR bit, partial BSS identification information, MAC transmission address information of the medium access control layer, MAC reception address information, MAC BSS identification information, and from/to address indication information.

Preferably, the method further comprises:

and updating the channel protection reservation time locally set by the station when the BSS indicated by the BSS attribution information is the same as the BSS to which the station belongs.

Preferably, the method further comprises:

and updating the channel protection reservation time locally set by the station when the BSS indicated by the BSS attribution information is different from the BSS to which the station belongs and the multiplexing transmission indication information is not allowed to be multiplexed.

Preferably, the channel idle detection performed by using the channel idle detection parameter set specifically includes:

and when the BSS indicated by the BSS attribution information is different from the BSS attributed to the site, the multiplexing transmission indication information is allowed to be multiplexed and the local channel protection reservation time of the site is zero, performing channel idle detection by using a channel idle detection parameter set.

Preferably, the set of channel idle detection parameters includes any one or more of the following parameters:

clear channel estimation CCA threshold 1, CCA threshold 2, energy detection ED threshold, signal detection SD threshold,

wherein the CCA threshold 1 is less than or equal to the CCA threshold 2.

CCA threshold 1, CCA threshold 2, ED threshold, SD threshold 1, SD threshold 2,

wherein the CCA threshold 1 is less than or equal to the CCA threshold 2, and the SD threshold 1 is less than or equal to the SD threshold 2.

Preferably, the performing the channel idle detection by using the set of channel idle detection parameters includes:

1) when the site detects a physical frame header of the wireless frame and the signal strength of a signal carrying the wireless frame is smaller than a CCA threshold 1, judging that a channel is idle;

2) when the site detects a physical frame header of the wireless frame and the signal strength of a signal carrying the wireless frame is greater than a CCA threshold 2, judging that a channel is busy;

3) when the station detects that the physical frame head of the wireless frame and the signal strength of the signal carrying the wireless frame are greater than a CCA threshold 1 and less than a CCA threshold 2, and the BSS indicated by the BSS attribution information is the same as the BSS attributed to the station, judging that a channel is busy;

4) when the station detects that a physical frame header of the wireless frame, the signal strength of a signal carrying the wireless frame is greater than a CCA threshold 1 and less than a CCA threshold 2, a BSS indicated by BSS attribution information is different from the BSS to which the station belongs, and multiplexing transmission indication information indicates that the wireless frame does not allow channel multiplexing transmission, judging that a channel is busy;

5) when the station detects that a physical frame header of the wireless frame and the signal strength of a signal carrying the wireless frame are greater than a CCA threshold 1 and less than a CCA threshold 2, the BSS indicated by the BSS attribution information is different from the BSS to which the station belongs, and multiplexing transmission indication information indicates that the wireless frame allows channel multiplexing transmission, judging that a channel is idle;

6) when the station detects that the signal intensity of a signal is smaller than an SD threshold or an SD threshold 1 in a wireless frame transmission time length, judging that a channel is idle;

7) when the station detects that the signal intensity of a signal is greater than an SD threshold or an SD threshold 2 in a wireless frame transmission time length, judging that a channel is busy;

8) and when the station detects that the signal intensity of a signal is greater than an SD threshold 1 and less than an SD threshold 2 in a wireless frame transmission time length and judges that a channel is idle according to any one of the steps 1), 2, 3), 4) and 5), judging that the channel state is idle.

Preferably, the performing the channel idle detection by using the set of channel idle detection parameters further comprises:

when the site does not detect the physical frame header of the wireless frame and the signal strength of the detected signal is smaller than an ED threshold, judging that a channel is idle;

and when the site does not detect the physical frame header of the wireless frame and the signal strength of the detected signal is greater than the ED threshold, judging that the channel is busy.

Preferably, the method further comprises:

when the channel idle detection is carried out according to the channel idle detection parameter set, the local parallel transmission permission state is updated according to the transmission time information indicated by the received wireless frame, specifically, a multiplexing transmission window counter of the local site is updated, and the multiplexing transmission window counter is decreased along with the time.

Preferably, when the station sends the wireless frame, the generating the multiplexing transmission indication information according to the result of the channel idle detection includes:

when the channel idle detection result is that the channel is busy, the station continues to detect the channel until the channel is idle, contends for accessing the channel, sends a wireless frame, and generates multiplexing transmission indication information indicating that other stations allow channel multiplexing transmission;

the site detects the local parallel transmission permission state when the channel idle detection result is that the channel is idle, and generates multiplexing transmission indication information indicating that other sites permit channel multiplexing transmission when the count value of a local multiplexing transmission window counter of the site is 0;

and the site detects the local parallel transmission permission state when the channel idle detection result is that the channel is idle, and generates multiplexing transmission indication information indicating that other sites do not permit channel multiplexing transmission when the count value of a local multiplexing transmission window counter of the site is not 0.

Preferably, when the result of the channel idle detection is that the channel is idle and the count value of the local multiplexing transmission window counter of the station is not 0, the multiplexing transmission indication information indicates that the data transmission duration of the station when sending the wireless frame does not exceed a maximum value of one frame exchange or one transmission opportunity TXOP.

The invention also provides a station comprising:

the detection module is used for carrying out channel idle detection by using a channel idle detection parameter set according to the analyzed address information, the Basic Service Set (BSS) attribution information and the multiplexing transmission indication information when the whole or part of the wireless frame is received;

and the information indicating module is used for generating multiplexing transmission indicating information according to a channel idle detection result when a wireless frame is sent, and carrying the multiplexing transmission indicating information and the BSS attribution information of the sites in the wireless frame sent by the sites so as to indicate whether other sites are allowed to carry out channel multiplexing transmission.

Preferably, the station further comprises:

a data transmission module for multiplexing the remaining transmission time of the received wireless frame to transmit data when the channel idle detection result is channel idle,

and when the channel idle detection result is that the channel is busy, continuously detecting the channel until the channel is idle, and then competitively accessing the channel to send a wireless frame.

Preferably, the station further comprises:

and the channel protection reservation time management module is used for updating the channel protection reservation time locally set by the station when the BSS indicated by the BSS attribution information is the same as the BSS to which the station belongs.

Preferably, the channel protection reservation time management module is further configured to update the channel protection reservation time locally set by the station when the BSS indicated by the BSS belonging information is different from the BSS to which the station belongs and the multiplexing transmission indication information is that multiplexing transmission is not allowed.

a clear channel estimation CCA threshold 1, a CCA threshold 2, an energy detection ED threshold, a signal detection SD threshold, where the CCA threshold 1 is less than or equal to the CCA threshold 2, or,

the channel idle detection parameter set comprises any one or more of the following parameters:

CCA threshold 1, CCA threshold 2, ED threshold, SD threshold 1, SD threshold 2,

wherein the CCA threshold 1 is less than or equal to the CCA threshold 2, the SD threshold 1 is less than or equal to the SD threshold 2, and the detection module includes:

a first judging unit, configured to judge that a channel is idle when a station detects a physical frame header of the wireless frame and a signal strength of a signal carrying the wireless frame is less than a CCA threshold 1;

a second determining unit, configured to determine that a channel is busy when the station detects a physical frame header of the radio frame and a signal strength of a signal carrying the radio frame is greater than a CCA threshold 2;

a third determining unit, configured to determine that a channel is busy when the station detects a physical frame header of the radio frame, the signal strength of a signal carrying the radio frame is greater than a CCA threshold 1 and less than a CCA threshold 2, and the BSS indicated by the BSS belonging information is the same as the BSS to which the station belongs;

a fourth determining unit, configured to determine that a channel is busy when the station detects a physical frame header of the radio frame, the signal strength of a signal carrying the radio frame is greater than a CCA threshold 1 and less than a CCA threshold 2, the BSS indicated by the BSS belonging information is different from the BSS to which the station belongs, and the multiplexing transmission indication information indicates that the radio frame does not allow channel multiplexing transmission;

a fifth judging unit, configured to judge that a channel is idle when the station detects a physical frame header of the radio frame, the signal strength of a signal carrying the radio frame is greater than a CCA threshold 1 and less than a CCA threshold 2, the BSS indicated by the BSS belonging information is different from the BSS to which the station belongs, and the multiplexing transmission indication information indicates that the radio frame allows channel multiplexing transmission;

a sixth judging unit, configured to judge that a channel is idle when the station detects that the signal strength of the signal is smaller than the SD threshold or the SD threshold 1 within a radio frame transmission duration;

a seventh judging unit, configured to judge that a channel is busy when the station detects that the signal strength of the signal is greater than the SD threshold or the SD threshold 2 within a radio frame transmission duration;

an eighth determining unit, configured to determine that a channel state is idle when the station detects that the signal strength of the signal is greater than the SD threshold 1 and smaller than the SD threshold 2 in a wireless frame transmission duration, and determines that the channel is idle according to whether any one of the first determining unit, the second determining unit, the third determining unit, the fourth determining unit, and the fifth determining unit has determined that the channel is idle.

Preferably, the detection module further comprises:

a ninth determining unit, configured to determine that a channel is idle when the site does not detect a physical frame header of the wireless frame and the signal strength of the detected signal is less than an ED threshold;

a tenth determining unit, configured to determine that a channel is busy when the station does not detect the physical frame header of the wireless frame and the signal strength of the detected signal is greater than an ED threshold.

Preferably, the station further comprises:

and the local state management module is used for updating a local parallel transmission permission state according to the transmission time information indicated by the received wireless frame when channel idle detection is carried out according to the channel idle detection parameter set, specifically updating a multiplexing transmission window counter local to the site, wherein the multiplexing transmission window counter is decreased with time.

Preferably, the information indication module includes:

a first information generating unit, configured to continue to detect the channel when a result of channel idle detection is that the channel is busy, contend for access to the channel until the channel is idle, send a wireless frame, and generate multiplexing transmission indication information indicating that other stations allow channel multiplexing transmission;

a second information generating unit, configured to detect the local parallel transmission permission state when a result of channel idle detection is channel idle, and generate multiplexing transmission indication information indicating that other stations permit channel multiplexing transmission when a count value of a local multiplexing transmission window counter of the station is 0;

a third information generating unit, configured to detect the local parallel transmission permission state when a result of the channel idle detection is channel idle, and generate multiplexing transmission indication information indicating that another station does not permit channel multiplexing transmission when a count value of a local multiplexing transmission window counter of the station is not 0.

A method of data transmission, comprising:

when a site receives a wireless frame, analyzing multiplexing transmission indication information of the wireless frame, and if the multiplexing transmission indication information indicates that multiplexing is allowed, judging that multiplexing transmission can be performed by the site; and if the multiplexing transmission indication information indicates that multiplexing is not allowed, the station judges that multiplexing transmission cannot be carried out.

Preferably, before the station analyzes the multiplexing transmission indication information of the radio frame, the method further includes:

and the station detects that the signal strength of the received physical frame header of the wireless frame and the signal carrying the wireless frame is greater than a CCA threshold 1 and less than a CCA threshold 2.

and the station detects that the BSS indicated by the received Basic Service Set (BSS) attribution information of the wireless frame is different from the BSS to which the station belongs.

Preferably, if the multiplexing indication information indicates that multiplexing is allowed, the station further includes, after determining that multiplexing transmission is possible:

and the station judges that the channel is idle.

Preferably, if the multiplexing indication information indicates that multiplexing is allowed, the determining, by the station, that multiplexing transmission is possible includes:

the station obtains the multiplexing time length through the transmission time length information of the physical frame header of the wireless frame;

the method further comprises the following steps:

the station starts the channel listening and backoff process using the SD threshold 1 and the SD threshold 2.

Preferably, before the station detects that the physical frame header of the radio frame is received and the signal strength of the signal carrying the radio frame is greater than the CCA threshold 1 for clear channel estimation and is less than the CCA threshold 2 for clear channel estimation, the method further includes:

when the station has data to send, the station performs virtual channel detection, and if the station determines that the virtual channel is idle, the station starts a backoff process, and meanwhile, the physical carrier monitoring mechanism continues to monitor the channel, and starts a channel idle detection parameter set to determine that the channel is busy in the backoff process.

Preferably, the virtual channel detection performed by the station includes:

the method comprises the steps that a site detects local channel protection reservation time;

if the local channel reservation time is zero, the station judges that the virtual channel state is idle, otherwise, the station judges that the virtual channel state is busy and keeps the monitoring state.

a CCA threshold 1, a CCA threshold 2, an ED threshold, an SD threshold 1 and an SD threshold 2;

wherein, the CCA threshold 1 is not less than the CCA threshold 2, and the SD threshold 1 is not less than the SD threshold 2.

Preferably, the back-off process uses the channel idle detection parameter set to determine busy idle, including:

when the site detects a physical frame header of a wireless frame and the signal strength of the wireless frame is less than a CCA threshold 1, judging that a channel is idle;

when the site detects a physical frame header of a wireless frame and the signal strength of the wireless frame is greater than the CCA threshold 2, the channel busy is judged;

the station detects that the wireless signal intensity in a wireless frame transmission time is less than the SD threshold 1, and the channel is judged to be idle;

the station detects that the wireless signal intensity in a wireless frame transmission time is greater than the SD threshold 2, and the channel is busy;

and the station judges that the channel is idle when the wireless signal strength detected in a wireless frame transmission time length is greater than the SD threshold 1 but less than the SD threshold 2.

Preferably, the judging of busy by the backoff process using the information idle detection parameter set includes:

the station does not detect a physical frame header of a wireless frame, and the detected signal strength is smaller than an ED threshold, and the idle channel is judged;

and the station does not detect the physical frame head of the wireless frame, and the detected signal strength is greater than the ED threshold, so that the channel busy is judged.

Preferably, after the station determines that the channel is idle, the method further includes:

the station finishes the backoff process;

and the station starts data transmission after the back-off is finished, and the data transmission duration of the station exceeds the multiplexing time length.

Preferably, if the multiplexing indication information indicates that multiplexing is not allowed, after the station determines that multiplexing transmission is not allowed, the method further includes:

the station judges that the channel is busy.

Preferably, if the multiplexing indication information indicates that multiplexing is not allowed, the station determines that multiplexing transmission is not allowed, further including:

the station updates the channel protection reservation time set locally according to the transmission time information indicated by the received wireless frame, and specifically, when the transmission time information is greater than the value of the local channel protection reservation time of the station, the value of the local channel protection reservation time is updated by using the time information.

A station, comprising:

the analysis module is used for analyzing multiplexing transmission indication information of a wireless frame when the wireless frame is received by a station;

a first judgment module, configured to judge that multiplexing transmission is possible if the multiplexing transmission indication information indicates that multiplexing is allowed; and if the multiplexing transmission indication information indicates that multiplexing is not allowed, judging that multiplexing transmission cannot be carried out.

Preferably, the method further comprises the following steps:

a first detecting module, configured to detect that a signal strength of a received physical frame header of the radio frame and a signal carrying the radio frame is greater than a CCA threshold for clear channel estimation 1 and less than a CCA threshold for clear channel estimation 2.

Preferably, the method further comprises the following steps:

and the second detection module is used for detecting that the BSS indicated by the received basic service set BSS attribution information of the wireless frame is different from the BSS to which the site belongs.

Preferably, the first determining module is further configured to determine that a channel is idle after the station determines that multiplexing transmission is possible.

Preferably, the first determining module includes: an obtaining unit;

the obtaining unit is configured to obtain a reusable time length through transmission duration information of a physical frame header of the wireless frame;

the station further comprises:

and the processing module is used for starting the channel monitoring and backoff process by using the SD threshold 1 and the SD threshold 2.

Preferably, the method further comprises the following steps:

the third detection module is used for carrying out virtual channel detection when data are to be sent;

the back-off module is used for starting a back-off process if the virtual channel state is judged to be idle, and simultaneously, the physical carrier monitoring mechanism continues to monitor the channel;

and the second judging module is used for starting the channel idle detection parameter set to judge the channel busy in the backoff process.

Preferably, the third detection module includes:

a detection unit for detecting a local channel protection reservation time;

a first judging unit, configured to judge that the virtual channel state is idle if the local channel reservation time is zero, and otherwise, judge that the virtual channel state is busy;

and the monitoring unit is used for keeping a monitoring state if the local channel reservation time is zero.

Preferably, the second determination module includes:

the second judgment unit is used for judging whether a channel is idle when the physical frame header of the wireless frame is detected and the signal strength of the wireless frame is less than the CCA threshold 1;

a third judging unit, configured to judge that the channel is busy when a physical frame header of the radio frame is detected and the signal strength of the radio frame is greater than the CCA threshold 2;

a fourth judging unit, configured to judge that a channel is idle when the detected wireless signal strength in a wireless frame transmission duration is less than an SD threshold 1;

a fifth judging unit, configured to judge that a channel is busy when the detected wireless signal strength in a wireless frame transmission duration is greater than the SD threshold 2;

and a sixth judging unit, configured to judge that the channel is idle when the detected wireless signal strength in a wireless frame transmission duration is greater than the SD threshold 1 but less than the SD threshold 2.

Preferably, the second determining module further includes:

a seventh judging unit, configured to judge that a channel is idle when a physical frame header of the wireless frame is not detected and the detected signal strength is smaller than an ED threshold;

and the eighth judging unit is used for judging that the channel is busy when the physical frame header of the wireless frame is not detected and the detected signal strength is greater than the ED threshold.

Preferably, the method further comprises the following steps:

an ending module for ending the backoff process;

and the transmission module is used for starting data transmission after the back-off is finished, and the data transmission duration of the station exceeds the multiplexing time length.

Preferably, the first determining module is further configured to determine that the channel is busy after determining that the multiplexing transmission is not possible.

Preferably, the first determining module includes:

and the updating unit is used for updating the locally set channel protection reservation time according to the transmission time information indicated by the received wireless frame, and specifically, when the transmission time information is greater than the value of the local channel protection reservation time of the site, the value of the local channel protection reservation time is updated by using the time information.

The invention provides a data transmission method and a site, wherein when the site receives the whole or part of wireless frames, the site uses a channel idle detection parameter set to detect channel idle according to the analyzed address information, Basic Service Set (BSS) attribution information and multiplexing transmission indication information, when the wireless frames are sent, the multiplexing transmission indication information is generated according to the result of the channel idle detection, and the multiplexing transmission indication information and the BSS attribution information of the site are carried in the wireless frames sent by the site to indicate whether other sites are allowed to carry out channel multiplexing transmission. The method and the device realize the prevention of the cyclic nesting and solve the cyclic nesting problem in the dynamic CCA channel detection threshold technology.

Drawings

Fig. 1 is an exemplary diagram of a WLAN basic service set BSS and OBSS;

fig. 2 is an exemplary diagram of a dynamic CCA threshold detection technique;

fig. 3 is a flowchart of a data transmission method according to an embodiment of the present invention;

fig. 4 is a schematic diagram of a method for determining channel busy using a CCA threshold in a channel clear detection parameter set;

FIG. 5 is a diagram illustrating a method for determining channel busy/idle using an ED threshold in a channel idle detection parameter set;

FIG. 6 is a diagram illustrating a method for determining channel busy/idle using an SD threshold in a channel idle detection parameter set

Fig. 7 is a diagram illustrating a transmission process of a multiplexed channel according to a third embodiment of the present invention;

FIG. 8 is a diagram of an example of a multiplexed transmission using a local multiplexed transmission window counter;

FIG. 9 is an exemplary diagram of a multiplexed transmission based on idle state classification;

fig. 10 is a schematic structural diagram of a station according to a seventh embodiment of the present invention;

fig. 11 is a schematic structural diagram of the detection module 1001 in fig. 10;

fig. 12 is a schematic structural diagram of the information indicating module 1002 in fig. 10.

Detailed Description

While the use of a variable detection threshold for channel detection can increase transmission opportunities, the use of a variable detection threshold can be problematic. For example, there is another STA3 in fig. 2 that supports the dynamic CCA technique, associated with access point AP 1. When the station STA1 communicates with the AP1, the station STA2 supports the dynamic CCA technique, increases its CCA detection threshold, multiplexes the transmission opportunity contention channel, and sends a signal to the AP 2. At the same time, STA3 also satisfies the condition of multiplexing STA2 and AP2 communication opportunities, STA3 continues to raise the CCA threshold in anticipation of obtaining a multiplexed transmission opportunity, and in so doing, evolves to the round-robin nesting problem. However, in the related art, there is no effective solution for how to solve the problem of loop nesting in the dynamic CCA channel detection threshold technology.

In order to solve the above problem, an embodiment of the present invention provides a data transmission method. Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.

Example one

The present embodiment provides a data transmission method, and a flow of determining multiplexing transmission in a data transmission process using the method is shown in fig. 3, where the method includes:

step 301, when the station receives the whole or part of the radio frame, the station uses the channel idle detection parameter set to perform channel idle detection according to the analyzed address information, the basic service set BSS attribution information and the multiplexing transmission indication information.

In this step, the address indicated by the address information of the wireless frame received by the station is different from the address of the station; when the channel idle detection result is that the channel is idle, the station multiplexes the received wireless frame transmission data; and when the channel idle detection result is that the channel is busy, the station transmits data by using a new wireless frame.

The BSS home information includes any one or any plurality of the following information:

COLOR bit, partial BSS identification information, medium access control layer (MAC) transmission address information, MAC reception address information, MAC BSS identification information, from/to address indication information.

Wherein, the COLOR bit is 1 bit or multi-bit information, which can identify the BSS; the from/to address indication information indicates the address of the transmitting or receiving station from which the BSS can be determined.

In the embodiment of the present invention, when receiving a wireless frame and analyzing the information that the BSS can belong to, channel protection reservation time needs to be updated, which includes two cases:

updating the channel protection reservation time locally set by the station when the BSS indicated by the BSS attribution information is the same as the BSS to which the station belongs;

Specifically, when the transmission time information indicated by the received wireless frame is greater than the value of the local channel protection reservation time of the site, the value of the local channel protection reservation time is updated by using the transmission time information.

For the configuration of the channel idle detection parameter set, there are two cases, which are respectively:

1. including any one or any plurality of the following parameters:

wherein the CCA threshold 1 is less than or equal to the CCA threshold 2;

2. including any one or any plurality of the following parameters:

CCA threshold 1, CCA threshold 2, ED threshold, SD threshold 1, SD threshold 2,

And when the BSS indicated by the BSS attribution information is different from the BSS attributed to the site, the multiplexing transmission indication information is allowed to be multiplexed and transmission, and the local channel protection reservation time of the site is not zero, judging that the channel is busy.

When the BSS indicated by the BSS attribution information is different from the BSS to which the station belongs, the multiplexing transmission indication information is allowed to be multiplexed, and the local channel protection reservation time of the station is zero, performing channel idle detection by using a channel idle detection parameter set, specifically as follows:

1) when the site detects a physical frame header of the wireless frame and the signal strength of a signal carrying the wireless frame is less than a CCA threshold 1, judging that a channel is idle;

3) when the station detects that the physical frame head of the wireless frame and the signal strength of a signal carrying the wireless frame are greater than a CCA threshold 1 and less than a CCA threshold 2, and the BSS indicated by the BSS attribution information is the same as the BSS attributed to the station, judging that a channel is busy;

4) when the station detects a physical frame header of the wireless frame, the signal strength of a signal carrying the wireless frame is greater than a CCA threshold 1 and less than a CCA threshold 2, a BSS indicated by BSS attribution information is different from the BSS to which the station belongs, and multiplexing transmission indication information indicates that the wireless frame does not allow channel multiplexing transmission, the station judges that a channel is busy;

5) when the station detects a physical frame header of the wireless frame, the signal strength of a signal carrying the wireless frame is greater than a CCA threshold 1 and less than a CCA threshold 2, the BSS indicated by the BSS attribution information is different from the BSS to which the station belongs, and the multiplexing transmission indication information indicates that the wireless frame allows channel multiplexing transmission, the station judges that a channel is idle;

6) when the station detects that the signal intensity of a signal is smaller than an SD threshold 1 in a wireless frame transmission time length, judging that a channel is idle;

7) when the station detects that the signal intensity of a signal is greater than the SD threshold 2 in a wireless frame transmission time length, the channel busy is judged;

In addition, for the case that no physical frame header is detected, the following processing is performed:

and judging that the channel is busy when the site does not detect the physical frame header of the wireless frame and the signal strength of the detected signal is greater than an ED threshold.

And when the channel idle detection is carried out according to the channel idle detection parameter set, updating a multiplexing transmission window counter local to the site according to the analyzed time information, wherein the multiplexing transmission window counter is decreased along with the time. Whether multiplex transmission is allowed to continue is determined based on the count value of the transmission window counter.

Step 302, when the station sends a wireless frame, generating multiplexing transmission indication information according to a result of channel idle detection, and carrying the multiplexing transmission indication information and BSS attribution information of the station in the wireless frame sent by the station to indicate whether other stations are allowed to perform channel multiplexing transmission.

According to the result of the channel idle detection, the station judges whether the data can be transmitted by using the remaining transmission time of the received wireless frame. When the channel idle detection result is that the channel is idle, the station multiplexes the residual transmission time of the received wireless frame to transmit data; and when the channel idle detection result is that the channel is busy, the station continuously detects the channel until the channel is idle, and then competitively accesses the channel and sends a wireless frame.

The method specifically comprises the following three conditions:

1. when the result of the idle detection of the channel is that the channel is busy, the station judges that the channel multiplexing transmission is not allowed;

2. when the result of the idle channel detection is that the channel is idle and the count value of a local multiplexing transmission window counter of the site is 0, the site judges that the channel multiplexing transmission is allowed;

3. and when the result of the channel idle detection is that the channel is idle and the count value of the local multiplexing transmission window counter of the site is not 0, the site judges that the channel multiplexing transmission is not allowed.

For the case 3 in step 302, when the result of the channel idle detection is that the channel is idle and the count value of the local multiplexing transmission window counter of the station is not 0, the station carries multiplexing transmission indication information in the transmitted wireless frame indicating that the duration of not allowing multiplexing transmission data does not exceed one frame exchange or one transmission opportunity TXOP maximum.

Example two

The present embodiment provides a data transmission method, which mainly describes how to use a procedure of determining channel busy and idle in a channel idle detection parameter set, and for configuration of a CCA threshold 1 and a CCA threshold 2, reference is made to the first embodiment of the present invention, and a description is not repeated here. As shown in fig. 4. When station a has data to send, it first performs virtual channel detection, i.e. checks the local NAV and/or BSS RID counter. If the local NAV and/or BSS RID counter is not zero, the station A virtual channel detection sets the channel state to busy and keeps the monitoring state. When the local NAV and/or the BSS RID counter is zero, the station a starts a backoff process, and simultaneously, the physical carrier monitoring mechanism continues to monitor the channel and starts a channel idle detection parameter set to determine busy.

Station a first performs physical channel detection using a fixed CCA channel detection threshold defined by the system, that is, CCA threshold 1. When the station A detects a leading signal of a wireless frame, if the energy of the leading signal is lower than a CCA threshold 1, the channel is judged to be idle; and if the energy of the preamble signal is more than the CCA threshold 2, judging that the channel is busy.

If the energy of the preamble signal is greater than the CCA threshold 1 but less than the CCA threshold 2, the station a continues to receive the radio frame, checks BSS attribution information, such as COLOR bit and/or Partial AID information, in the physical frame header signaling field SIG of the radio frame, and determines whether the radio frame is a radio frame transmitted by the basic service set BSS or a radio frame transmitted by an adjacent basic service set (OBSS, not the present BSS). If the BSS attribution information indicates that the BSS attribution information and the station belong to the same BSS, the channel is judged to be busy; if the BSS attribution information indicates that the BSS attribution information does not belong to the same BSS, the station continues decoding and checks the multiplexing transmission indication information. If the multiplexing transmission indication information indicates that multiplexing is allowed, judging that the channel is idle; if the indication does not allow multiplexing, the channel is judged to be busy.

EXAMPLE III

The present embodiment provides a data transmission method, which mainly describes how to use an ED threshold in a channel idle detection parameter set to determine a channel busy and idle process. As shown in fig. 5. When the station A has data to send, and the local NAV and/or BSSRID counter is zero, the station A starts a backoff process, and simultaneously starts a channel idle detection parameter set to judge busy idle.

The station A detects the wireless signal energy but not the lead of the wireless frame, if the wireless signal energy is less than the ED threshold, the channel is judged to be idle; and if the wireless signal energy is larger than the ED threshold, judging that the channel is busy.

Example four

This embodiment provides a data transmission method, which mainly describes how to use an SD threshold 1 and an SD threshold 2 in a channel idle detection parameter set to determine a channel busy/idle process, where the determination principle is as shown in fig. 6, and if it is detected that the strength of a wireless signal is smaller than the SD threshold 1, it determines that the channel is idle; if the detected wireless signal strength is larger than the SD threshold 2, the channel is judged to be busy, and the multiplexing transmission opportunity is abandoned. If the signal strength is greater than the SD threshold 1 but less than the SD threshold 2, the channel is already judged to be idle according to the rule of detecting the physical frame header in the first embodiment, and the channel state is judged to be idle. The multiplexing relationship in the transmission process of the multiplexed channel is shown in fig. 7: the station A has data to be sent, and detects the physical preamble of the wireless frame in the process of monitoring the physical channel. And the station A checks that the BSS home information is OBSS, multiplexes the transmission indication to be allowed, and judges that the channel state is idle, which indicates that the station A can multiplex the transmission opportunity. The station A obtains the multiplexing time length through the transmission time length information in the wireless frame preamble, and then starts a new channel monitoring and backoff process by using the SD threshold 1 and the SD threshold 2.

The station A starts channel monitoring in the multiplexing duration, and if the wireless signal strength is detected to be less than the SD threshold 1, the channel is judged to be idle; if the detected wireless signal strength is larger than the SD threshold 2, the channel is judged to be busy, and the multiplexing transmission opportunity is abandoned. If the signal strength is greater than the SD threshold 1 but less than the SD threshold 2, the channel is already judged to be idle according to the rule of detecting the physical frame header in the first embodiment, and the channel state is judged to be idle. And when the channel state is judged to be idle, the station A starts data transmission, and the transmission time length cannot exceed the time length specified by the transmission time length information in the wireless frame preamble.

EXAMPLE five

The present embodiment provides a data transmission method, which mainly describes a multiplexing transmission process using a local multiplexing transmission window counter.

The site A always maintains a local multiplexing transmission window counter, and when data is sent, the site A carries multiplexing transmission indication information to indicate whether channel multiplexing is allowed or not in a sent wireless frame physical frame header according to the state of the counter. The operation flow is shown in fig. 8, and includes:

step 801, a station A detects whether a physical frame header is received;

in this step, station a has data to send, detects the physical channel, determines whether a physical frame header is received, detects the physical frame header of the wireless frame in the physical channel monitoring process, and enters step 802; if the physical frame header cannot be detected, step 803 is entered to perform an ED threshold decision process, which refers to the first embodiment of the present invention.

Step 802, the station A compares the RSSI, the CCA threshold 1 and the CCA threshold 2;

according to the comparison result, there are three specific cases:

1. RSSI < CCA threshold 1, at this time step 804 is entered, and it is determined that the channel is idle;

2. CCA threshold 1< RSSI < CCA threshold 2, at which point step 806 is entered;

3. RSSI > CCA threshold 2, at which point step 805 is entered to determine that the channel is busy.

Step 803, performing an ED judgment process;

step 804, judging that the channel is idle;

step 805, determining that the channel is busy;

according to the method in the second embodiment, the station a determines the busy state of the channel by using the channel idle detection parameter set. Station a first performs physical channel detection using a fixed CCA channel detection threshold defined by the system, that is, CCA threshold 1. And the station A detects a preamble signal of a wireless frame, the energy of the signal is larger than the CCA threshold 1 and smaller than the CCA threshold 2, and the station A continues to receive the wireless frame.

Step 806, station a checks whether BSS attribution information is an OBSS;

step 807 is entered when BSS home information is OBSS, otherwise step 805 is entered when the channel is considered busy.

Checking BSS attribution information in a wireless frame header signaling field SIG, wherein the BSS attribution information indicates that the BSS does not belong to the same BSS, continuously decoding by the station A, entering the step 803, and checking multiplexing transmission indication information.

Step 807, the station A checks whether multiplexing is allowed;

and the station A checks the multiplexing transmission indication information and judges whether the channel is idle or not. The multiplexing transmission indication information indicates that multiplexing is allowed, step 808 is entered, otherwise step 805 is entered.

Step 808, judging that the channel is idle;

step 809, the station A detects whether the transmission duration is longer than the local multiplexing transmission window counter;

here, when the channel is idle, station a starts multiplexing channels. The station A firstly checks the transmission duration information in the wireless frame head and then detects whether the transmission duration is greater than a local multiplexing transmission window counter or not; if the detection result is greater than the predetermined value, step 810 is entered, otherwise step 812 is entered.

Step 810, if the transmission duration is longer than the local parallel transmission window counter, updating the multiplexing transmission window counter by using the transmission duration information;

step 811, site a performs a backoff process using an SD threshold;

step 812, the local multiplex transmission window counter is decreased with time;

step 813, when the backoff process is finished and the channel is idle, the station a initiates data transmission;

step 814, detecting whether the multiplexing transmission window counter is 0;

if yes, go to step 815, otherwise go to step 816.

Step 815, multiplexing transmission indication information indicates multiplexing permission;

here, at this time, if the local multiplexing transmission window counter has been decremented to 0, the station a carries multiplexing transmission indication information in the physical frame header of the transmitted wireless frame, indicating that channel multiplexing transmission is allowed.

Step 816, multiplexing transmission indication information indicates that multiplexing is not allowed.

Here, if the local multiplexing transmission window counter is not 0, the station a indicates that the channel multiplexing transmission is not allowed in the multiplexing transmission indication information carried in the physical frame header of the transmitted wireless frame.

EXAMPLE six

The embodiment provides a data transmission method, and mainly describes multiplexing transmission based on idle state classification. In this embodiment, the channel idle states in the channel idle detection parameter set are classified: when an idle state that the energy of a wireless frame preamble signal is smaller than a CCA threshold 1 is detected, defining the idle state as a channel idle 1; when detecting that the energy of a wireless frame preamble signal is greater than a CCA threshold 1 and less than a CCA threshold 2, the BSS attribution information indicates the OBSS, and the channel multiplexing indication is an idle state when multiplexing is allowed and is defined as channel idle 2.

The specific process is shown in fig. 9, and includes:

step 901, station a detects whether a physical frame header is received;

here, when the station a performs physical channel monitoring through the channel idle detection parameter set, it detects whether a physical frame header is received. When detecting the physical frame header, entering step 903; if no physical frame header is detected, step 902 is entered.

Step 902, performing an ED threshold decision process;

step 903, comparing the RSSI with a CCA threshold 1 and a CCA threshold 2;

in this step, channel idle detection is performed after the physical frame header is detected. The method specifically comprises the following three conditions:

1. RSSI < CCA threshold 1, go to step 904;

2. when the CCA threshold 1< RSSI < CCA threshold 2, go to step 905; .

3. When RSSI > CCA threshold 2, step 906 is entered.

Step 904, when the channel state is judged to be idle 1, the site a carries multiplexing transmission indication information in a physical frame header of a transmitted wireless frame, and indicates that channel multiplexing transmission is allowed;

step 905, according to

steps

806 and 807 in the fifth embodiment of the present invention, when it is determined that the channel state is idle 2, the station a carries multiplexing transmission indication information in a physical frame header of a transmitted wireless frame, indicating that channel multiplexing transmission is not allowed;

step 906, judging that the channel is busy;

step 907, start the rollback process, and transmit the data after the rollback process is completed.

EXAMPLE seven

The present embodiment provides a station, whose structure is shown in fig. 10, including:

a detection module 1001, configured to perform channel idle detection by using a channel idle detection parameter set according to the parsed address information, basic service set BSS attribution information, and multiplexing transmission indication information when receiving the whole or part of the radio frame;

an information indicating module 1002, configured to generate multiplexing transmission indication information according to a result of channel idle detection when a wireless frame is sent, and carry the multiplexing transmission indication information and BSS attribution information of the station in the wireless frame sent by the station, so as to indicate whether to allow other stations to perform channel multiplexing transmission.

Preferably, the station further comprises:

a data transmission module 1003, configured to multiplex the remaining transmission time of the received wireless frame to transmit data when the channel idle detection result is channel idle,

Preferably, the station further comprises:

a channel protection reservation time management module 1004, configured to update the channel protection reservation time locally set by the station when the BSS indicated by the BSS belonging information is the same as the BSS to which the station belongs.

Preferably, the channel protection reservation time management module 1004 is further configured to update the channel protection reservation time set locally by the station when the BSS indicated by the BSS belonging information is different from the BSS to which the station belongs and the multiplexing transmission indication information is that multiplexing transmission is not allowed.

CCA threshold 1, CCA threshold 2, ED threshold, SD threshold 1, SD threshold 2,

wherein the CCA threshold 1 is not less than the CCA threshold 2, the SD threshold 1 is not less than the SD threshold 2, and the structure of the detection module 1001 is shown in fig. 11, and includes:

a first determining unit 1101, configured to determine that a channel is idle when a station detects a physical frame header of the radio frame and a signal strength of a signal carrying the radio frame is less than a CCA threshold 1;

a second determining unit 1102, configured to determine that a channel is busy when the station detects a physical frame header of the radio frame and a signal strength of a signal carrying the radio frame is greater than a CCA threshold 2;

a third determining unit 1103, configured to determine that a channel is busy when the station detects that a physical frame header of the radio frame, a signal strength of a signal carrying the radio frame is greater than a CCA threshold 1 and less than a CCA threshold 2, and a BSS indicated by BSS belonging information is the same as a BSS to which the station belongs;

a fourth determining unit 1104, configured to determine that a channel is busy when the station detects that a physical frame header of the radio frame, a signal strength of a signal carrying the radio frame is greater than a CCA threshold 1 and less than a CCA threshold 2, a BSS indicated by BSS belonging information is different from a BSS to which the station belongs, and multiplexing transmission indication information indicates that the radio frame does not allow channel multiplexing transmission;

a fifth determining unit 1105, configured to determine that a channel is idle when the station detects a physical frame header of the radio frame, the signal strength of a signal carrying the radio frame is greater than a CCA threshold 1 and less than a CCA threshold 2, the BSS indicated by the BSS belonging information is different from the BSS to which the station belongs, and the multiplexing transmission indication information indicates that the radio frame allows channel multiplexing transmission;

a sixth determining unit 1106, configured to determine that a channel is idle when the station detects that the signal strength of the signal is smaller than the SD threshold or the SD threshold 1 within a radio frame transmission duration;

a seventh determining unit 1107, configured to determine that a channel is busy when the station detects that the signal strength of the signal in a wireless frame transmission duration is greater than an SD threshold or an SD threshold 2;

an eighth determining unit 1108, configured to determine that a channel state is idle when the station detects that the signal strength of the signal is greater than the SD threshold 1 and smaller than the SD threshold 2 in a wireless frame transmission duration, and determines that a channel is idle according to any one of the first determining unit 1101, the second determining unit 1102, the third determining unit 1103, the fourth determining unit 1104, and the fifth determining unit 1105.

Preferably, the detection module 1001 further includes:

a ninth determining unit 1109, configured to determine that a channel is idle when the station does not detect a physical frame header of the radio frame and the signal strength of the detected signal is smaller than an ED threshold;

a tenth determining unit 1110, configured to determine that a channel is busy when the station does not detect the physical frame header of the radio frame and the signal strength of the detected signal is greater than an ED threshold.

Preferably, the station further comprises:

a local state management module 1005, configured to update a local parallel transmission permission state, specifically, update a local multiplexing transmission window counter of the site according to transmission time information indicated by a received radio frame, where the multiplexing transmission window counter is decremented over time when performing channel idle detection according to a channel idle detection parameter set.

Preferably, the structure of the information indication module 1002 is as shown in fig. 12, and includes:

a first information generating unit 1201, configured to, when a result of channel idle detection is that a channel is busy, continue to detect the channel until the channel is idle, contend for access to the channel, send a wireless frame, and generate multiplexing transmission indication information indicating that another station allows channel multiplexing transmission;

a second information generating unit 1202, configured to detect the local parallel transmission permission state when a result of channel idle detection is channel idle, and generate multiplexing transmission indication information indicating that another station allows channel multiplexing transmission when a count value of a local multiplexing transmission window counter of the station is 0;

a third information generating unit 1203, configured to detect the local parallel transmission permission state when a result of the channel idle detection is channel idle, and generate multiplexing transmission indication information indicating that another station does not permit channel multiplexing transmission when a count value of a local multiplexing transmission window counter of the station is not 0.

The station may be combined with the data transmission method provided in the embodiment of the present invention, and when the station receives the whole or a part of the radio frame, the station performs channel idle detection by using a channel idle detection parameter set according to the analyzed address information, the BSS attribution information, and the multiplexing transmission indication information, and when the radio frame is sent, generates the multiplexing transmission indication information according to a result of the channel idle detection, and carries the multiplexing transmission indication information and the BSS attribution information of the station in the radio frame sent by the station to indicate whether to allow other stations to perform channel multiplexing transmission. The method and the device realize the prevention of the cyclic nesting and solve the cyclic nesting problem in the dynamic CCA channel detection threshold technology.

It will be understood by those of ordinary skill in the art that all or part of the steps of the above embodiments may be implemented using a computer program flow, which may be stored in a computer readable storage medium and executed on a corresponding hardware platform (e.g., system, apparatus, device, etc.), and when executed, includes one or a combination of the steps of the method embodiments.

Alternatively, all or part of the steps of the above embodiments may be implemented by using an integrated circuit, and the steps may be respectively manufactured as an integrated circuit module, or a plurality of the blocks or steps may be manufactured as a single integrated circuit module. Thus, the present invention is not limited to any specific combination of hardware and software.

The devices/functional modules/functional units in the above embodiments may be implemented by general-purpose computing devices, and they may be centralized on a single computing device or distributed on a network formed by a plurality of computing devices.

Each device/function module/function unit in the above embodiments may be implemented in the form of a software function module and may be stored in a computer-readable storage medium when being sold or used as a separate product. The computer readable storage medium mentioned above may be a read-only memory, a magnetic disk or an optical disk, etc.

Any person skilled in the art can easily conceive of changes or substitutions within the technical scope of the present disclosure, and all such changes or substitutions are included in the scope of the present disclosure. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A method of data transmission, comprising:

2. The data transmission method according to claim 1,

when the channel idle detection result is that the channel is idle, the station multiplexes the residual transmission time of the received wireless frame to transmit data;

3. The data transmission method according to claim 1, wherein the address indicated by the address information of the wireless frame received by the station is different from the address of the station.

4. The data transmission method according to claim 1, wherein the BSS home information includes any one or more of the following information:

a COLOR bit, partial BSS identification information, MAC sending address information of a medium access control layer, MAC receiving address information, MAC BSS identification information and from/to address indication information;

wherein the COLOR bit is information identifying the BSS.

5. The data transmission method of claim 1, further comprising:

6. The data transmission method of claim 1, further comprising:

7. The data transmission method according to claim 1, wherein the channel idle detection using the set of channel idle detection parameters specifically comprises:

8. The data transmission method according to claim 1,

wherein the CCA threshold 1 is less than or equal to the CCA threshold 2.

9. The data transmission method according to claim 1,

CCA threshold 1, CCA threshold 2, ED threshold, SD threshold 1, SD threshold 2,

10. The data transmission method according to claim 8 or 9, wherein the channel idle detection using the set of channel idle detection parameters comprises:

11. The data transmission method of claim 10, wherein the channel idle detection using the set of channel idle detection parameters further comprises:

12. The data transmission method according to claim 8 or 9, characterized in that the method further comprises:

13. The data transmission method of claim 12, wherein the generating, by the station, the multiplexing transmission indication information according to the result of the channel idle detection when the station transmits the radio frame comprises:

14. The data transmission method of claim 13,

and when the result of the channel idle detection is that the channel is idle and the count value of the local multiplexing transmission window counter of the site is not 0, indicating that the data transmission duration of the site does not exceed the maximum value of one frame exchange or one transmission opportunity TXOP when the site sends a wireless frame in the multiplexing transmission indication information.

15. A station, comprising:

16. The station of claim 15, further comprising:

17. The station of claim 15, further comprising:

18. The station of claim 17,

the channel protection reservation time management module is further configured to update the channel protection reservation time locally set by the station when the BSS indicated by the BSS belonging information is different from the BSS to which the station belongs and the multiplexing transmission indication information is not allowed to be multiplexed.

19. The station of claim 15,

CCA threshold 1, CCA threshold 2, ED threshold, SD threshold 1, SD threshold 2,

20. The station of claim 19, wherein the detection module further comprises:

21. The station of claim 19, further comprising:

22. The station of claim 21, wherein the information indication module comprises:

23. A method of data transmission, comprising:

when a site receives a wireless frame, analyzing multiplexing transmission indication information of the wireless frame, and if the multiplexing transmission indication information indicates that multiplexing is allowed, judging that multiplexing transmission can be performed by the site; if the multiplexing transmission indication information indicates that multiplexing is not allowed, the station judges that multiplexing transmission cannot be carried out;

the multiplexing transmission indication information is generated according to a channel idle detection result, and the channel idle detection result is obtained by using a channel idle detection parameter set according to the analyzed address information, Basic Service Set (BSS) attribution information and multiplexing transmission indication information.

24. The data transmission method of claim 23, wherein before the station parses the multiplexing transmission indication information of the radio frame, the method further comprises:

25. The data transmission method of claim 23, wherein before the station parses the multiplexing transmission indication information of the radio frame, the method further comprises:

26. The data transmission method according to any one of claims 23 to 25, wherein if the multiplexing indication information indicates that multiplexing is allowed, the station determines that multiplexing transmission is possible, and further comprising:

and the station judges that the channel is idle.

27. The data transmission method according to claim 26, wherein if the multiplexing indication information indicates multiplexing is allowed, the determining by the station that multiplexing transmission is possible includes:

the method further comprises the following steps:

28. The data transmission method according to claim 27, wherein before the station detects that the physical frame header of the radio frame is received and the signal strength of the signal carrying the radio frame is greater than the clear channel estimation CCA threshold 1 and less than the clear channel estimation CCA threshold 2, the method further comprises:

29. The data transmission method of claim 28, wherein the station performing virtual channel detection comprises:

30. The data transmission method according to claim 28 or 29, wherein the set of channel idle detection parameters comprises any one or more of the following parameters:

31. The data transmission method according to claim 30, wherein the backoff procedure uses the set of channel idle detection parameters to determine busy idle, comprising:

32. The data transmission method according to claim 30, wherein the backoff procedure uses an information idle detection parameter set to determine idle, comprising:

33. The data transmission method according to any one of claims 23 to 25, wherein if the multiplexing indication information indicates that multiplexing is not allowed, after the station determines that multiplexing transmission is not allowed, the method further includes:

the station judges that the channel is busy.

34. The data transmission method according to any one of claims 23 to 25, wherein if the multiplexing indication information indicates that multiplexing is not allowed, the station determines that multiplexing transmission is not possible, further comprising:

the station updates the channel protection reservation time set locally according to the transmission time information indicated by the received wireless frame; specifically, when the transmission duration information is greater than the value of the local channel protection reservation time of the station, the value of the local channel protection reservation time is updated by using the duration time information.

35. A station, comprising:

a first judgment module, configured to judge that multiplexing transmission is possible if the multiplexing transmission indication information indicates that multiplexing is allowed; if the multiplexing transmission indication information indicates that multiplexing is not allowed, judging that multiplexing transmission cannot be carried out;

36. The station of claim 35, further comprising:

37. The station of claim 35, further comprising:

38. A station according to any of claims 35 to 37, wherein said first determining module is further configured to determine that the channel is free after said station determines that multiplexing transmission is possible.

39. The station of claim 38, wherein the first determining module comprises: an obtaining unit;

the station further comprises:

40. The station of claim 39, further comprising:

41. The station of claim 40, wherein the third detection module comprises:

a detection unit for detecting a local channel protection reservation time;

42. The station according to claim 40 or 41, wherein the set of channel idle detection parameters comprises any one or more of the following parameters:

43. The station of claim 42, wherein the second determining module comprises:

44. The station of claim 42, wherein the second determining module further comprises:

45. The station according to any of claims 35 to 37, wherein the first determining module is further configured to determine that the channel is busy after determining that multiplexing transmission is not possible.

46. The station according to any of claims 35 to 37, wherein the first determining module comprises: