WO2016107597A1

WO2016107597A1 - Data transmission method and station

Info

Publication number: WO2016107597A1
Application number: PCT/CN2015/100093
Authority: WO
Inventors: 江岸明; 吕开颖; 田开波
Original assignee: 中兴通讯股份有限公司
Priority date: 2014-12-31
Filing date: 2015-12-31
Publication date: 2016-07-07
Also published as: CN105812091A

Abstract

A data transmission method and station, the method comprising: a second source station receives a first radio frame and acquires the sending address information and the receiving address information of the first radio frame; in a preset first duration, the second station does not monitor a feedback radio frame of a first target station, and in a preset second duration, monitors a second radio frame sent by a first source station, and the second source station competes for a multiplexed transmission opportunity; and the second source station, after acquiring the competed multiplexed transmission opportunity, sends a radio frame to a second target station. The technical solution of the present invention detects data transmission in a dynamic channel, and by means of detecting both sides of the multiplexed transmission, respectively determines whether the current transmission will be impacted, and only implements multiplexed transmission when detecting that the medium currently carrying a wireless transmission can multiplex; in this way, a multiplexed transmission opportunity is improved whilst ensuring the reliability of the current transmission.

Description

Data transmission method and site

Technical field

This paper relates to the field of data transmission technology in wireless local area network (WLAN) technology, especially a data transmission method and station based on dynamic channel detection.

Background technique

At present, the use of WLAN for data communication has become very common, and the global demand for WLAN coverage is growing. The IEEE 802.11 group of the Institute of Electrical and Electronics Engineers has defined a series of standards such as 802.11a/b/g/n/ac to meet the growing demand for communication. Among them, the dynamic channel detection threshold is an alternative technology for improving the channel multiplexing rate and solving the network efficiency, which has attracted extensive attention and research.

In a common WLAN network, a basic service set (BSS, Basic Service Set) can be formed by an access point (AP, Access Point) and a plurality of stations (STA, Station) associated therewith. At present, 802.11 supports two methods of channel idle determination for physical carrier detection and virtual carrier detection. When both virtual carrier detection and physical carrier detection determine that the channel is idle, the associated station can perform contention transmission. The physical carrier detection refers to the CSA (Clear Channel Assessment) channel detection technology, that is, the associated station detects whether the channel is busy or idle by detecting the signal strength on the medium and combining the CCA threshold. The CCA threshold is usually fixed at the receiving sensitivity at the lowest modulation coding rate to ensure maximum reception coverage. The virtual carrier detection refers to a third-party associated station other than the communication parties. When receiving a radio frame whose reception address is not its own, the local network allocation vector (NAV is set according to the value of the duration field in the radio frame. The value of Network Allocation Vector), NAV is a counter. When the NAV is not zero, the channel is considered busy and no contention is sent.

The CCA channel detection technique has always used a fixed threshold as a criterion for judging the busyness of the channel, thus reducing channel access opportunities in some scenarios. As shown in FIG. 1, STA1 is associated with AP1, and STA2 is associated with AP2. In FIG. 1, a solid single arrow line indicates that a radio frame is transmitted to a target receiving station, and a dotted single arrow line indicates that a radio frame signal arrives at a third party station. Although STA1 and STA2 can successfully transmit data to respective APs respectively, when STA1 sends to AP1 In the case of a radio frame, due to the more conservative CCA threshold (such as -82dBm), STA2 monitors the signal strength of STA1 to -70dBm, which is greater than the CCA threshold (-82dBm). The channel is considered busy, but in fact, STA2 sends to AP2. The signal, because STA2's signal strength to AP1 is much lower than the signal strength of STA1 to AP1, will not cause interference to the reception of AP1, and AP2 can successfully receive the signal of STA2. However, in this scenario, it is impossible for STA2 to send a radio frame to AP2, thereby preventing multiplex transmission, that is, a too low CCA threshold reduces the transmission opportunity of STA2.

In view of the above situation, the concept of dynamic sensitivity control/Dynamic Sensitivity Control (DSC) is proposed in the current discussion. That is, the channel detection threshold of the STA is no longer a fixed value, but the channel detection threshold of the station itself is dynamically adjusted according to the energy of the beacon frame (Racon) of the received AP, that is, the closer the station is to the AP, the channel detection. The higher the threshold, the more the signal below the detection threshold is masked, thereby increasing the efficiency of the station's own access to the channel. Still taking FIG. 1 as an example, STA1 detects that the signal energy that STA 2 is transmitting is -70 dB before transmitting data to AP1, and the channel detection threshold of STA1 after DSC is higher than -70 dB, therefore, STA1 ignores the signal of STA2, thereby Access the channel and transfer data to AP1.

However, when the site adjusts the CCA detection threshold through DSC (here, such a site is also called a DSC site) to increase channel access opportunities, it also increases the probability of collision with other devices, especially for DSC sites. Sites outside the range are not heard by the DSC site when such a site is using the channel, and the DSC site may use the channel at this time to interfere with the data transmission of the site. The closer the two are, the closer the two are. The greater the possibility of being disturbed. The more such sites, the greater the probability of collisions, thereby reducing the reliability of current transmissions in data transmission for dynamic channel detection.

Summary of the invention

The technical problem to be solved by the present invention is to provide a data transmission method and a station, which can improve the reliability of the current transmission while improving the multiplexing transmission opportunity in the data transmission of the dynamic channel detection.

In order to achieve the object of the present invention, the following technical solutions are adopted:

A data transmission method includes:

Receiving, by the second source station, the first radio frame sent by the first source station to the first destination station;

The second source station does not listen to the feedback radio frame of the first destination station, and monitors the first source station to the first time in a preset second duration. a second radio frame sent by a destination station;

The second source site competes for a multiplexing transmission opportunity;

The second source station sends a third radio frame to the second destination station.

Optionally, the step of the second source station sending the third radio frame to the second destination station includes:

Transmitting, by the second source station, the multiplex transmission request to the second destination station, and after receiving the multiplex transmission response frame from the second destination station correctly, sending the foregoing to the second destination station Three radio frames; or,

The second source station directly sends the third radio frame to the second destination station.

Optionally, the method further includes: the second source station keeps the local channel reservation timer NAV unchanged.

Optionally, the method further includes: the second source station acquiring a transmission duration of the second radio frame by decoding a physical frame header of the second radio frame.

Optionally, the end time point at which the second source station sends the third radio frame to the second destination station does not exceed an end time point of the second radio frame.

Optionally, the step of the second source site competing for multiplexing transmission opportunities includes:

The second source station performs backoff using a dynamic CCA threshold, and obtains the multiplexing transmission opportunity after the end of the backoff; or

The second source station obtains the multiplex transmission opportunity after a random length of time.

Optionally, before the step of the second source site competing for multiplexing the transmission opportunity, the method further includes:

Obtaining, by the second source station, the sending power of the first destination station, or acquiring the sending power of the second source station, and the first destination, from the first radio frame or the second radio frame The difference in transmission power of the station;

The second source station uses a transmission power less than or equal to the first destination station to compete for a multiplexing transmission opportunity.

Optionally, the multiplex transmission request carries:

The received address information of the first radio frame, the transmit power of the first destination station, the transmit power of the second source station, and/or the demodulation threshold of the second source station.

Optionally, before the step of the second source station competing for multiplexing the transmission opportunity, the local channel reservation timer of the second source station is 0.

A data transmission method includes:

The second destination station receives the multiplex transmission request sent by the second source station, where the second source station receives the first wireless sent by the first source station to the first destination station before sending the multiplex transmission request frame;

The second destination station determines that the medium carrying the wireless transmission can be multiplexed, and returns a multiplexed transmission response frame to the second source station.

Optionally, the step that the second destination station determines that the medium that is carrying the wireless transmission can be multiplexed includes:

If the second destination station does not listen to the feedback radio frame sent by the first destination station, and the channel reservation timer of the second destination station is 0, the second destination station determines that the wireless transmission is being carried. The media can be reused.

The transmission power of the second destination station is less than or equal to the transmission power of the first destination station, and the second destination station determines that the medium that is carrying the wireless transmission can be multiplexed.

Optionally, the method further includes:

The second destination station receives the third radio frame sent by the second source station, and then the second destination station returns a response frame to the third radio frame to the second source station;

The second destination station replies to the second source station to the third radio frame. The end time point of the frame should not exceed the end time point of the second radio frame sent by the first source station to the first destination station after the first radio frame.

A site includes: a listening module, a first determining module, and a transmitting module; wherein

The monitoring module is configured to: receive a first radio frame sent by the first source station to the first destination station; and within a preset first duration, the feedback radio frame of the first destination station is not monitored, and Receiving, by the preset second time period, the second radio frame sent by the first source station to the first destination station, and sending a notification to the first determining module;

The first determining module is configured to: after receiving the notification, determine to obtain a contention multiplexing transmission opportunity, and notify the transmission module;

The transmitting module is configured to: receive a notification from the first determining module, and send a third radio frame to the second destination station.

Optionally, the transmission module is configured to send the third radio frame to the second destination station as follows:

Sending a multiplex transmission request frame to the second destination station; after receiving the multiplex transmission response frame from the second destination station, sending the third radio frame to the second destination station; or

Transmitting the third radio frame directly to the second destination station.

Optionally, the first determining module is further configured to: keep the NAV of the site to which it belongs unchanged.

Optionally, the first determining module is further configured to: obtain the sending power of the first destination station from the first radio frame or the second radio frame, or obtain the sending of the second source station The difference between the power and the transmission power of the first destination station; competing for multiplexing transmission opportunities using a transmission power less than or equal to the first destination station.

Optionally, the site further includes a second determining module, where the second determining module is configured to:

A multiplexed transmission request frame from the other stations is received; the medium that is carrying the wireless transmission is determined to be multiplexed, and the multiplexed transmission response frame is returned to the other of the stations.

Optionally, the second determining module is specifically configured to: not listen to the site at the site to which it belongs When the feedback radio frame sent by the first destination station is 0, and the channel reservation timer local to the target station is 0, the multiplex transmission response frame is returned to the other stations.

Optionally, the second determining module is further configured to: when the sending power of the station to which the user belongs is less than or equal to the sending power of the first destination station, return a multiplexed transmission response radio frame to the other stations.

Compared with the related art, the technical solution of the present application includes that the source station receives the first radio frame and obtains the sending address information and the receiving address information of the first radio frame; and the source station does not listen to the receiving address within the preset first duration. Demonstrating a feedback radio frame of the station, and listening to the second radio frame sent by the station indicated by the sending address within a preset second duration, the source station competing for the multiplex transmission opportunity; after the source station obtains the contending multiplexing transmission opportunity Send a wireless frame to the destination site. In the data transmission of the dynamic channel detection, the multiplex transmission is performed by detecting whether the multiplexed transmission side respectively determines whether the current transmission is affected, and detecting that the medium carrying the wireless transmission can be multiplexed, so that the multiplex transmission is performed. While improving the multiplexing transmission opportunity, on the other hand, the reliability of the current transmission is also guaranteed.

Other features and advantages of the invention will be set forth in the description which follows, The objectives and other advantages of the invention may be realized and obtained by means of the structure particularly pointed in the appended claims.

BRIEF abstract

The drawings described herein are intended to provide a further understanding of the invention, and are intended to be a part of the invention. In the drawing:

1 is a schematic diagram of an example of a channel detection threshold condition of a related art;

2 is a flowchart of a data transmission method according to an embodiment of the present invention;

3 is a schematic structural diagram of a structure of a station according to an embodiment of the present invention;

4 is a schematic diagram of an embodiment of data transmission of the present invention.

Preferred embodiment of the invention

The following is an overview of the topics detailed in this document. This Summary is not intended to limit the scope of the claims.

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that, in the case of no conflict, the features in the embodiments and the embodiments in the present application may be arbitrarily combined with each other.

FIG. 2 is a flowchart of a data transmission method according to an embodiment of the present invention. As shown in FIG. 2, the method includes at least the following steps:

Step 200: The second source station receives the first radio frame sent by the first source station to the first destination station.

In this step, the sending address information and the receiving address information of the first radio frame may also be obtained, where the sending address information of the first radio frame is the address information of the first source station, the first wireless The received address information of the frame is the address information of the first destination station. These address information are used to subsequently listen to radio frames and are used to determine which station the radio frame comes from. Of course, it is also possible to determine which station the radio frame comes from by other means, and is not limited to being determined by the address.

The first source site and the first destination site are sites in communication, and the second source site and the second destination site mentioned below are source sites and destination sites to be contiguously multiplexed;

When the second source station starts to attempt multiplexing transmission, if the first radio frame being transmitted is detected, the second source station can learn from the first radio frame: the sending address information of the first radio frame, and the first radio frame. Receive address information.

Step 201: After receiving the first radio frame, the second source station does not listen to the feedback radio frame of the first destination station within a preset first duration, and monitors the location within a preset second duration. The second radio frame sent by the first source station, the second source station competing for the multiplexing transmission opportunity.

It should be noted that, when the second source station listens to the first radio frame but does not hear the feedback frame of the first radio frame, the second source station is triggered to perform multiplexing transmission with the second radio frame. The first radio frame and the second radio frame are both sent by the first source station.

The receiver receives the first radio frame and sends the feedback radio frame through the short interframe space (SIFs). Therefore, those skilled in the art know that the first duration refers to the end of the first radio frame. The duration of the SIFs is separated; the second duration refers to the duration of the (SIFs+Feedback Radio Frames+SIFs), and the second source station can obtain the duration of the feedback radio frames by decoding the first radio frame, plus the duration of the two SIFs. Two hours long.

At this time, the second source station maintains the local channel reservation timer (NAV) unchanged.

At this time, when the second source station listens to the first radio frame but does not hear the feedback frame of the first radio frame, it triggers a moment when the second source station attempts to perform multiplexing transmission with the second radio frame.

Further, the value of the channel reservation timer local to the second source site is 0 before starting to contend for the multiplex transmission opportunity. That is, the channel reservation timer local to the second source site needs to be decremented to zero before starting to contend for the multiplex transmission opportunity.

In this step, the second source station may use the contention retreat process to obtain the contention of the contiguous multiplex transmission, for example, using the dynamic CCA threshold to perform the backoff, and obtaining the contention of the multiplexed transmission after the end of the backoff, and implementing a well-known technology belonging to those skilled in the art, and It is not intended to limit the scope of protection of the present invention, and is not described herein again. Alternatively, the second source station may obtain the multiplex transmission opportunity after a random length of time, wherein a random duration may be zero.

Step 202: The second source station obtains the multiplex transmission opportunity and sends a third radio frame to the second destination station.

The multiplexing time of the second source station and the second destination station does not exceed the transmission duration of the second radio frame. Here, the second source station may acquire the transmission duration of the second radio frame by decoding the physical frame header of the second radio frame. That is, the end time point of the third radio frame sent by the second source station to the second destination station does not exceed the end time point of the second radio frame, and the second destination station replies to the end time of the radio frame to the second source station. The point does not exceed the end time point of the second radio frame. Multi-frame interaction can be performed between the second source station and the second destination station, but the total frame interaction duration does not exceed the transmission duration of the second radio frame.

The sending, by the second source station in the step, the third radio frame to the second destination station includes:

The second source station sends a multiplex transmission request to the second destination station, and after correctly receiving the multiplex transmission response frame from the second destination station, sends a third radio frame carrying the data to the second destination station;

Alternatively, the second source station directly sends the third radio frame carrying the data to the second destination station.

Further, after the second source station sends the multiplex transmission request frame to the second destination station, the step further includes: determining, by the second destination station, that the medium that is carrying the wireless transmission can be multiplexed, and returning the multiplexed transmission response to the second source station. frame.

The second destination station determines that the medium that is carrying the wireless transmission can be multiplexed, specifically:

If the second target station does not listen to the feedback radio frame sent by the first destination station, and the channel reservation timer local to the second destination station is 0, the second destination station determines that the medium that is carrying the wireless transmission can be reused. ;or,

Optionally, before determining that the transmit power of the second destination station is less than or equal to the transmit power of the first destination station, the method may include: the second destination station according to the second source site carried in the received multiplex transmission request frame. The transmit power and/or the demodulation threshold of the second source station adjusts its own transmit power. Here, how to adjust the well-known technology of the person skilled in the art, the specific implementation is not used to limit the scope of protection of the present invention, and details are not described herein again.

In this step, when the second target station does not listen to the feedback radio frame sent by the first destination station, the multiplex transmission response frame is returned to the second source station.

In the embodiment of the present invention, the first source station may carry its own local transmit power in the first radio frame that is sent. In this case, the receiver of the first radio frame, that is, the first destination station, is in the feedback radio frame. It may carry its own transmission power; it may also indicate in the first radio frame that the first destination station carries the local transmission power of the first destination station in the feedback radio frame.

Further, after the step 201, before the step 202, the method of the embodiment of the present invention further includes:

The second source station may obtain the sending power of the first destination station by using the radio frame fed back by the first destination station; and acquiring the first source station and the first first in the second radio frame sent from the first source station to the first destination station. The transmission power of the destination station is poor, and the transmission power of the first destination station is calculated; or the transmission power of the first destination station is obtained from the second radio frame sent by the first source station to the first destination station.

When the transmission power of the second source station itself is smaller than the transmission power of the first destination station, or After the second source station adjusts its own transmit power and contends the multiplex transmission opportunity with a transmission power less than or equal to the first destination station, the second source station performs a step of competing for the multiplex transmission opportunity; otherwise, the process ends. The second source station transmits the third radio frame to the second destination station using power less than or equal to the transmit power of the first destination station.

At this time, the multiplexed transmission request frame sent by the second source station to the target station carries: the transmission power of the second source station, and/or the demodulation threshold of the second source station, and/or the first radio frame. Receiving address information, and/or transmission power of the first destination station.

After the second destination station receives the multiplex transmission request from the second source station, and before the second source station correctly receives the multiplex transmission response frame from the second destination station, the method further includes:

The second destination station determines that the medium carrying the wireless transmission can be multiplexed, and the multiplexed transmission response frame returned to the second source station.

The second destination station detects that the medium that is carrying the wireless transmission can be multiplexed, including:

The second destination station does not listen to the feedback radio frame sent by the first destination station, and the target station local channel reservation timer is 0; or

When the transmission power of the second destination station itself is less than or equal to the transmission power of the first destination station, the multiplex transmission response radio frame is returned to the second source station.

In the data transmission of the dynamic channel detection, the multiplex transmission is performed by detecting whether the multiplexed transmission side respectively determines whether the current transmission is affected, and detecting that the medium that is carrying the wireless transmission can be multiplexed, so that the multiplex transmission is performed. On the one hand, the multiplex transmission opportunity is improved, and on the other hand, the reliability of the current transmission is also guaranteed.

FIG. 3 is a schematic structural diagram of a structure of a station according to an embodiment of the present invention. As shown in FIG. 3, the method includes at least: a monitoring module, a first determining module, and a transmission module;

The monitoring module is configured to: receive the first radio frame and obtain the sending address information and the receiving address information of the first radio frame; and within the preset first duration, the feedback radio frame of the first destination station is not monitored, a determining module sends a first notification, and monitors a second radio frame sent by the first source station within a preset second duration, and sends a second notification to the first determining module;

The first determining module is configured to: receive the first notification and the second notification, and obtain a competitive multiplexing transmission Notifying the transmission module after the opportunity is received;

The transmission module is configured to: receive the notification from the first determining module, and send the wireless frame to the second destination station.

The first determining module is specifically configured to: receive the first notification and the second notification, obtain a multiplexed transmission request opportunity, and then send a multiplex transmission request frame to the second destination station; and receive the multiplexed transmission response frame from the target station. Transmitting the transmission module; correspondingly, the transmission module is specifically configured to: send the radio frame carrying the data to the second destination station;

Alternatively, the first determining module is specifically configured to: directly notify the transmitting module; correspondingly, the transmitting module is specifically configured to: send the wireless frame carrying the data to the second destination station.

The first determining module is further configured to: keep the NAV of the site to which it belongs unchanged.

The first determining module is further configured to: obtain a transmit power of the first destination station from a transmit power difference carried in the second radio frame; and start when a transmit power of the second source site is less than or equal to a transmit power of the first destination station Competing reuse transmission opportunities.

Further, the embodiment of the present invention further includes a second determining module, configured to: receive a multiplex transmission request frame from the second source station; and detect that the medium that is carrying the wireless transmission can be multiplexed, and return to the second source site. Use the transmission response frame. specifically,

The second determining module is specifically configured to: when the site to which the user belongs does not listen to the feedback radio frame sent by the first destination station, and the channel reservation timer of the target station is 0, return the multiplexed transmission response to the second source station. frame.

Alternatively, the second determining module is specifically configured to: when the sending power of the station to which the user belongs is less than or equal to the sending power of the first destination station, return the multiplexed transmission response radio frame to the second source station.

The embodiment of the present invention further discloses a site, as shown in FIG. 3, comprising: a listening module, a first determining module, and a transmitting module; wherein

Transmitting the third radio frame directly to the second destination station.

Optionally, the first determining module is further configured to: obtain the sending power of the first destination station from the first radio frame or the second radio frame, or obtain the sending of the second source station The difference between the power and the transmission power of the first destination station; when the transmission power of the second source station is less than or equal to the transmission power of the first destination station, it is determined that the contention competition transmission opportunity is obtained.

Optionally, the second determining module is specifically configured to: when the site to which the user belongs belongs to the feedback radio frame sent by the first destination station, and the channel reservation timer of the target site is 0, The site returns a multiplexed transmission response frame.

An embodiment of the present invention provides a data transmission method, including: receiving, by a source station, a first radio frame, and obtaining sending address information and receiving address information of the first radio frame;

Within a preset first duration, the source station does not listen to the feedback radio frame of the station indicated by the receiving address, and listens to the second radio frame sent by the station indicated by the sending address within a preset second duration;

The source station contends for the transmission opportunity, and the source station obtains the multiplexed transmission opportunity and sends the radio frame to the destination station.

The sending, by the source station, the radio frame to the destination station includes:

The source station sends a multiplex transmission request to the destination station, and after receiving the multiplex transmission response frame from the destination station correctly, sends the radio frame carrying the data to the destination station;

Alternatively, the source station directly sends a radio frame carrying data to the destination station.

The method also includes the source station maintaining the local channel reservation timer NAV unchanged.

The method further includes: the source station acquiring a transmission duration of the second radio frame by decoding a physical frame header of the second radio frame.

The end time point of the radio frame sent by the source station to the destination station does not exceed the end time point of the second radio frame.

The source site competing for multiplexing transmission opportunities includes:

The source site performs backoff using a dynamic CCA threshold, and the multiplexing transmission opportunity is obtained after the backoff is completed;

Alternatively, the source station obtains the multiplex transmission opportunity after a random length of time.

The source site also includes:

And obtaining, by the source station, a transmission power difference carried in the second radio frame, and acquiring a transmission power of the station indicated by the receiving address of the first radio frame;

The source station contends for multiplexing transmission opportunities when the transmission power of the source station is less than or equal to the transmission power of the station indicated by the reception address of the first radio frame.

The multiplexed transmission request frame carries: the received address information of the first radio frame, and/or the transmission power of the station indicated by the receiving address of the first radio frame, and/or the source station Transmit power, and/or demodulation thresholds of the source station.

Local channel reservation meter of the source site before the source station begins to contend for multiplexing transmission opportunities The timer is 0.

The embodiment of the invention further provides a data transmission method, including:

The destination station receives the multiplex transmission request;

The medium detecting the wireless transmission being carried can be multiplexed, and the multiplexed transmission response frame is returned to the source station.

The destination station detects that the medium that is carrying the wireless transmission can be multiplexed, including:

The target station does not listen to the feedback radio frame sent by the station indicated by the receiving address of the first radio frame received by the source station, and the channel reservation timer local to the target station is 0.

The transmission power of the destination station is less than or equal to the transmission power of the station indicated by the reception address of the first radio frame received by the source station.

The end time point at which the destination station replies to the source station with the radio frame does not exceed the end time point of the second radio frame.

The embodiment of the present invention further provides a site, including at least: a listening module, a first determining module, and a transmitting module; wherein

The monitoring module is configured to: receive the first radio frame and obtain sending address information and receiving address information of the first radio frame; and within a preset first time period, the source station does not monitor the feedback wireless of the station indicated by the receiving address Sending a first notification to the first determining module, and listening to the second radio frame sent by the station indicated by the sending address within a second time period set in advance, and sending a second notification to the first determining module;

The first determining module is configured to: receive the first notification and the second notification, and notify the transmission module after obtaining the contention multiplexing transmission opportunity;

The transmission module is configured to: receive a notification from the first determining module, and send a radio frame to the destination station.

The first determining module is specifically configured to: receive the first notification and the second notification, obtain a multiplexed transmission request opportunity, and then send a multiplex transmission request frame to the destination station; receive the multiplexed transmission response frame from the target station, and notify The transmission module; correspondingly,

The transmission module is specifically configured to: send a radio frame carrying data to the destination station.

The first determining module is specifically configured to: directly notify the transmission module; correspondingly,

The first determining module is further configured to: obtain a sending power of the station indicated by the receiving address of the first radio frame from the sending power difference carried in the second radio frame; and when the sending power of the source station is less than or equal to the first radio When the transmission power of the station indicated by the reception address of the frame is timed, the contention competition transmission opportunity starts.

The site further includes a second determining module configured to: receive a multiplexed transmission request frame from the source station; detect that the medium carrying the wireless transmission can be multiplexed, and return a multiplexed transmission response frame to the source station.

The second determining module is specifically configured to: when the station to which the user belongs does not listen to the feedback radio frame sent by the station indicated by the receiving address of the first radio frame, and the channel reservation timer of the target station is 0, A multiplexed transmission response frame is returned to the source site.

The second determining module is further configured to: when the sending power of the station to which the user belongs is less than or equal to the sending power of the station indicated by the receiving address of the first radio frame, returning the multiplexed transmission response wireless to the source station frame.

The method of the present invention will be described in detail below in connection with two specific embodiments.

First embodiment:

Referring to FIG. 4, the site S1 and the site D1 are the source site 1 and the destination site 1 that are currently transmitting DATA1, and the site S2 and the site D2 are the source site 2 and the destination site 2 that are competitively multiplexed. Assuming that in the first embodiment, the station S2 does not receive the feedback radio frame of the station D1, considers that the distance D1 is far, and starts to attempt multiplexing transmission.

The station S1 communicates with the station D1. If the station S2 receives the radio frame 1 sent by the station S1, that is, the first radio frame, and does not receive the radio frame 2 of the D1 reply, that is, the feedback radio frame, the station S2 is not updated by the radio frame 1 NAV. The station S2 parses the DATA1, that is, the preamble in the second radio frame, to obtain the DATA1 transmission duration, and then uses the dynamic CCA threshold to perform the backoff. After the end of the avoidance, the multiplex transmission request frame is transmitted to the station D2.

At this time, if the power of the DATA1 received by the station S2 is greater than the dynamic CCA threshold, the backoff is not performed, and the flow is ended and the local NAV is updated according to the transmission duration of the DATA1.

As shown in FIG. 4, after receiving the multiplex request frame sent by the station S2, the station D2 feeds back the multiplexed transmission response frame, and after receiving the station, the station S2 sends the DATA2 to the station D2, and the communication duration with the station D2 does not exceed the end of the DATA1 transmission. At the time point, the station D2 returns the response ACK2 after receiving the DATA2, and the ACK2 power is the same as the multiplexed transmission response frame.

It should be noted that if the station D2 cannot hear the multiplex transmission request frame by the DATA1 interference, the multiplex transmission establishment fails, and the process ends.

If the site D2 is set with the NAV by the site D1, the site D2 refuses to feed back the multiplexed transmission response frame to the site S2, and the multiplex transmission establishment fails, and the process ends.

Second embodiment:

The power asymmetry problem of the multiplexed transmission side and the current communication side is considered. Referring to FIG. 4, the site S1 and the site D1 are the source site 1 and the destination site 1 that are currently transmitting DATA1, and the site S2 and the site D2 are the source site 2 and the destination site 2 that are competitively multiplexed. Assuming that in the second embodiment, the station S2 does not receive the feedback radio frame of the station D1, considers that the distance D1 is far, and starts to attempt multiplexing transmission.

The station S1 communicates with the station D1. The radio frame 1 is the first radio frame carrying the transmission power information of the station S1, and the radio frame 2, that is, the feedback radio frame carries the transmission power information of the station D1, and the DATA1 is the second radio frame. Carrying power difference information of station S1 and station D1;

If the station S2 receives the radio frame 1 sent by the station S1 and does not receive the radio frame 2 replied by the station D1, the local NAV of the station S2 is kept unchanged. In this embodiment, it is assumed that the station S2 calculates the transmission power of the station D1 according to the power difference information carried in the DATA1. If the transmission power of the station S2 is less than or equal to the calculated transmission power of the station D1, the station S2 parses out the DATA1. After obtaining the transmission time length of DATA1, the preamble in the preamble uses the dynamic CCA threshold to perform backoff, and after the end of the backoff, sends a multiplex transmission request frame to the station D2. The method for calculating the transmission power of the site D1 is a conventional technical means for those skilled in the art, and is not intended to limit the scope of protection of the present invention, and details are not described herein.

At this time, if the power of DATA1 received by station S2 is greater than the dynamic CCA threshold, then it will not enter. Line back.

In this embodiment, the multiplexed transmission request frame carries information such as the transmission power of the station S2, the demodulation threshold of the station S2, the address of the station D1, and the transmission power parameter.

If the station D2 does not listen to the radio frame 2 replied by the station D1, as shown in FIG. 4, after receiving the multiplex transmission request frame sent by the station S2, the station D2 calculates its own path with the station S2 according to the transmission power of the station S2. Loss, adjust the transmission power of the station according to the demodulation threshold of the station S1. If the transmission power of the adjusted station S2 is less than or equal to the transmission power of the station D1, the station D2 feeds back the multiplex transmission response frame to the station S2; After the feedback, DATA2 is sent to the station D2, and the communication duration with the station D2 does not exceed the transmission duration of the DATA1, and the station D2 returns ACK2 after receiving the DATA2, and the ACK2 power is the same as the multiplexed transmission response frame.

It should be noted that if the station S2 also listens to the radio frame 2 that the station D1 replies, that is, the feedback radio frame, that is, the station D2 is set with the NAV by the radio frame 2 replied by the station D1, then the station D2 receives the station S2. After the multiplexed transmission request frame is transmitted, the path loss of the station and the station S2 is calculated according to the transmission power of the station S2, and the transmission power of the station is adjusted according to the demodulation threshold of the station S1, and if the signal transmitted by the adjusted station D2 reaches the station. The arriving power of D1 is less than or equal to the preset threshold, and the station D2 feeds back the multiplexed transmission response frame to the station S2; after receiving the feedback, the station S2 sends the DATA2 to the station D2, and the communication duration with the station D2 does not exceed the transmission end time point of the DATA1. After the site D2 receives the DATA2, it replies with ACK2, and the ACK2 power is the same as the multiplexed transmission response frame.

Third embodiment:

The process of multiplexing transmission with the next radio frame after the source station receives the second radio frame is considered. Site S1 and Site D1 are source site 1 and destination site 1 that are currently transmitting DATA1, and site S2 and site D2 are source site 2 and destination site 2 that are contending for multiplexing. Assuming that in the third embodiment, the station S2 does not receive the feedback radio frame of the station D1, and considers that the distance D1 is far away, and starts to attempt multiplexing transmission.

The station S1 communicates with the station D1. If the station S2 receives the radio frame 1 sent by the station S1, that is, the first radio frame, and does not receive the radio frame 2 of the D1 reply, that is, the feedback radio frame, the station S2 is not updated by the radio frame 1 NAV. In this embodiment, after the station S2 parses the DATA1, that is, the first radio frame, it is learned that S1 next sends DATA2, that is, the second radio frame to D1, and the station S2 parses out. The preamble in DATA2 uses the dynamic CCA threshold to perform the backoff after obtaining the DATA2 transmission duration, and sends the multiplex transmission request frame to the station D2 after the backoff.

At this time, if the power of the DATA2 received by the station S2 is greater than the dynamic CCA threshold, the backoff is not performed, the flow is ended, and the local NAV is updated according to the transmission duration of the DATA2.

After receiving the multiplex request frame sent by the station S2, the station D2 feeds back the multiplexed transmission response frame, and after receiving the station, the station S2 sends the DATA3 to the station D2, and the communication time with the station D2 does not exceed the transmission end time point of the DATA2, and the station D2 receives After DATA3 is finished, the response is ACK2, and the ACK2 power is the same as the multiplexed transmission response frame.

Fourth embodiment:

Describes the process by which a source station competes to multiplex a transmission opportunity and sends data directly to the destination site. Site S1 and Site D1 are source site 1 and destination site 1 that are currently transmitting DATA1, and site S2 and site D2 are source site 2 and destination site 2 that are contending for multiplexing. Assuming that in the fourth embodiment, the station S2 does not receive the feedback radio frame of the station D1, considers that the distance D1 is far, and starts to attempt multiplexing transmission.

The station S1 communicates with the station D1. If the station S2 receives the radio frame 1 sent by the station S1, that is, the first radio frame, and does not receive the radio frame 2 of the D1 reply, that is, the feedback radio frame, the station S2 is not updated by the radio frame 1 NAV. The station S2 parses out the DATA1, that is, the preamble in the second radio frame, to obtain the DATA1 transmission duration, and then uses the dynamic CCA threshold to perform the retreat. After the retreat is finished, the DATA2 is sent to the station D2, and the transmission duration of the DATA2 does not exceed the DATA1 transmission end time point.

The above is only a preferred embodiment of the present invention and is not intended to limit the scope of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

The embodiment of the invention also discloses a computer program, comprising program instructions, when the program instruction is executed by the station, so that the station can execute any of the above data transmission methods.

The embodiment of the invention also discloses a carrier carrying the computer program.

Other aspects will be apparent upon reading and understanding the drawings and detailed description.

One of ordinary skill in the art will appreciate that all or a portion of the steps of the above-described embodiments can be implemented using a computer program flow, which can be stored in a computer readable storage medium, such as on a corresponding hardware platform (eg, The system, device, device, device, etc. are executed, and when executed, include one or a combination of the steps of the method embodiments.

Alternatively, all or part of the steps of the above embodiments may also be implemented by using an integrated circuit. These steps may be separately fabricated into individual integrated circuit modules, or multiple modules or steps may be fabricated into a single integrated circuit module. achieve. Thus, the invention is not limited to any specific combination of hardware and software.

The devices/function modules/functional units in the above embodiments may be implemented by a general-purpose computing device, which may be centralized on a single computing device or distributed over a network of multiple computing devices.

When each device/function module/functional unit in the above embodiment is implemented in the form of a software function module and sold or used as a stand-alone product, it can be stored in a computer readable storage medium. The above mentioned computer readable storage medium may be a read only memory, a magnetic disk or an optical disk or the like.

Variations or substitutions are readily conceivable within the scope of the present invention by those skilled in the art and are within the scope of the present invention. Therefore, the scope of the invention should be determined by the scope of the claims.

Industrial applicability

The technical solution of the present application includes that the source station receives the first radio frame and obtains the sending address information and the receiving address information of the first radio frame; and the source station does not monitor the feedback radio frame of the first destination station within the preset first duration. And the second wireless frame sent by the first source station is monitored within a preset second time period, and the source station contends for the multiplexing transmission opportunity; the source station obtains the contention of the multiplexed transmission opportunity and then sends the wireless frame to the destination station. In the data transmission of the dynamic channel detection, the multiplex transmission is performed by detecting whether the multiplexed transmission side respectively determines whether the current transmission is affected, and detecting that the medium carrying the wireless transmission can be multiplexed, so that the multiplex transmission is performed. While improving the multiplexing transmission opportunity, on the other hand, the reliability of the current transmission is also guaranteed. Therefore, the present invention has strong industrial applicability.

Claims

A data transmission method includes:

Receiving, by the second source station, the first radio frame sent by the first source station to the first destination station;

The second source station does not listen to the feedback radio frame of the first destination station, and monitors the first source station to the first time in a preset second duration. a second radio frame sent by a destination station;

The second source site competes for a multiplexing transmission opportunity;

The second source station sends a third radio frame to the second destination station.
The data transmission method according to claim 1, wherein the step of the second source station transmitting the third radio frame to the second destination station comprises:

Transmitting, by the second source station, the multiplex transmission request to the second destination station, and after receiving the multiplex transmission response frame from the second destination station correctly, sending the foregoing to the second destination station Three radio frames; or,

The second source station directly sends the third radio frame to the second destination station.
The data transmission method according to claim 1 or 2, further comprising the second source station maintaining the local channel reservation timer NAV unchanged.
The data transmission method according to claim 1 or 2, further comprising: the second source station acquiring a transmission duration of the second radio frame by decoding a physical frame header of the second radio frame.
The data transmission method according to claim 4, wherein the end time point at which the second source station transmits the third radio frame to the second destination station does not exceed an end time point of the second radio frame.
The data transmission method according to claim 1, wherein the step of the second source site competing for multiplexing transmission opportunities comprises:

The second source station performs backoff using a dynamic CCA threshold, and obtains the multiplexing transmission opportunity after the end of the backoff; or

The second source station obtains the multiplex transmission opportunity after a random length of time.
The data transmission method according to claim 2, wherein before the step of the second source site competing for multiplexing the transmission opportunity, the method further comprises:

Obtaining, by the second source station, the sending power of the first destination station, or acquiring the sending power of the second source station, and the first destination, from the first radio frame or the second radio frame The difference in transmission power of the station;

The second source station uses a transmission power less than or equal to the first destination station to compete for a multiplexing transmission opportunity.
The data transmission method according to claim 2 or 7, wherein the multiplex transmission request carries:

The received address information of the first radio frame, the transmit power of the first destination station, the transmit power of the second source station, and/or the demodulation threshold of the second source station.
The data transmission method according to claim 1, wherein a local channel reservation timer of said second source station is 0 before said second source station contends for multiplexing transmission opportunity.
A data transmission method includes:

The second destination station receives the multiplex transmission request sent by the second source station, where the second source station receives the first wireless sent by the first source station to the first destination station before sending the multiplex transmission request frame;

The second destination station determines that the medium carrying the wireless transmission can be multiplexed, and returns a multiplexed transmission response frame to the second source station.
The data transmission method according to claim 10, wherein the step of determining, by the second destination station, that the medium carrying the wireless transmission is multiplexable comprises:

If the second destination station does not listen to the feedback radio frame sent by the first destination station, and the channel reservation timer of the second destination station is 0, the second destination station determines that the wireless transmission is being carried. The media can be reused.
The data transmission method according to claim 10, wherein the step of determining, by the second destination station, that the medium carrying the wireless transmission is multiplexable comprises:

The transmission power of the second destination station is less than or equal to the transmission power of the first destination station, and the second destination station determines that the medium that is carrying the wireless transmission can be multiplexed.
The data transmission method according to claim 10, further comprising:

The second destination station receives the third radio frame sent by the second source station, and then the second destination station returns a response frame to the third radio frame to the second source station;

The first destination station returns to the second source station, and the end time point of the response frame to the third radio frame does not exceed the first radio frame, and the first source station is first. The end time point of the second radio frame sent by the destination station.
A site includes: a listening module, a first determining module, and a transmitting module; wherein

The monitoring module is configured to: receive a first radio frame sent by the first source station to the first destination station; and within a preset first duration, the feedback radio frame of the first destination station is not monitored, and Receiving, by the preset second time period, the second radio frame sent by the first source station to the first destination station, and sending a notification to the first determining module;

The first determining module is configured to: after receiving the notification, determine to obtain a contention multiplexing transmission opportunity, and notify the transmission module;

The transmitting module is configured to: receive a notification from the first determining module, and send a third radio frame to the second destination station.
The station of claim 14, wherein the transmission module is configured to transmit a third radio frame to the second destination station as follows:

Sending a multiplex transmission request frame to the second destination station; after receiving the multiplex transmission response frame from the second destination station, sending the third radio frame to the second destination station; or

Transmitting the third radio frame directly to the second destination station.
A station according to claim 14 or 15, wherein said first determining module is further arranged to maintain the NAV of the site to which it belongs.
The station according to claim 14, wherein the first determining module is further configured to: obtain a transmission power of the first destination station from the first radio frame or the second radio frame, or acquire a location Transmitting power of the second source station and transmitting power of the first destination station Poor; use a transmission power less than or equal to the first destination station to contend for the transmission opportunity.
A station according to claim 14, 15, 16 or 17, wherein said station further comprises a second determining module, said second determining module being arranged to:

A multiplexed transmission request frame from the other stations is received; the medium that is carrying the wireless transmission is determined to be multiplexed, and the multiplexed transmission response frame is returned to the other of the stations.
The station according to claim 18, wherein the second determining module is specifically configured to: the feedback radio frame sent by the first destination station is not monitored at a site to which the user belongs, and the channel reservation timer local to the target station When 0, the multiplexed transmission response frame is returned to the other stations.
The station according to claim 18, wherein the second determining module is further configured to: return to the other of the stations when the transmission power of the station to which the network belongs is less than or equal to the transmission power of the first destination station Respond to the radio frame with the transmission.