WO2017084558A1

WO2017084558A1 - Data transmission method and device based on channel detection

Info

Publication number: WO2017084558A1
Application number: PCT/CN2016/105913
Authority: WO
Inventors: 李楠; 吕开颖; 邢卫民; 韩志强; 卢忱; 张力
Original assignee: 中兴通讯股份有限公司
Priority date: 2015-11-18
Filing date: 2016-11-15
Publication date: 2017-05-26
Also published as: CN106712909A; CN106712909B

Abstract

Provided are a data transmission method and device based on channel detection. The method comprises: a site receiving a downlink physical protocol data unit (PPDU) transmitted by an access point, wherein the downlink PPDU carries downlink data transmitted to the site and trigger information for triggering the site to perform uplink multi-user transmission; the site performing channel detection, and the site transmitting an uplink PPDU to the access point in the manner of uplink multi-user transmission when a result of detection on a channel is busy, wherein the uplink PPDU message carries an acknowledgement frame for the downlink data. The problem that an unnecessary retransmission may be caused when an access point cannot receive an acknowledgement frame in time is solved, and the waste of an air interface resource is prevented.

Description

Data transmission method and device based on channel detection

Technical field

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

Background technique

At present, the wireless local area network (WLAN) network load is increasing. As the number of users increases, the efficiency of the WLAN network will decrease significantly. Simply increasing the rate does not solve the problem. Multi-user parallelism Transmission, as an alternative technology to solve network efficiency, has caused widespread concern and research. Multi-user parallel transmission technologies include MU-MIMO (multi-user MIMO) technology, OFDMA (Orthogonal Frequency Division Multiple Access) technology, and the like. MU-MIMO distributes multiple layers of MIMO to multiple sites, using spatial multiplexing techniques to improve time and frequency utilization. The OFDMA technology can better utilize the result of frequency selection between stations to improve the frequency utilization, and can reduce the proportion of the competition resources of the packet transmission to the entire transmission and improve the time utilization.

In the WLAN, an Access Point (AP) and a plurality of Non-AP Stations (Non-AP STAs) associated with the AP form a basic service set (Basic Service). Set, abbreviated as BSS), FIG. 1 is a diagram showing an example of a WLAN basic service set BSS according to the related art, as shown in FIG. 1. At present, the WLAN supports two methods of channel idle determination for virtual carrier detection and physical carrier detection. When both virtual carrier detection and physical carrier detection determine that the channel is idle, the station can perform contention transmission. The so-called virtual carrier detection refers to a third-party site other than the communication parties. When receiving a radio frame whose reception address is not its own, the local NAV (network allocation vector) value is set according to the Duration field in the frame. When the NAV is not zero, the channel is considered to be busy and no contention is transmitted. The NAV is decremented with the time slot, and when it is reduced to 0, the channel is determined to be idle. Physical carrier detection refers to CCA (clear channel assessment) channel detection technology. The station determines whether the channel is busy or idle by detecting the signal strength on the medium.

The multi-user parallel transmission in the WLAN is generally that multiple Non-AP STAs simultaneously send data to the AP. Generally, this is called Uplink Multi-User (UL MU) transmission, or the AP simultaneously gives multiple Non-APs. The STA sends data, which is called Downlink Multi-User (DL MU) transmission. FIG. 2 is a schematic diagram of a multi-user transmission frame exchange according to the related art, as shown in FIG. 2 .

In the related art, the UL MU transmission needs to be triggered by the AP, for example, it can send a trigger frame to trigger, or trigger in a manner that carries a trigger information field in the radio frame. The trigger frame or the trigger information field carries the scheduling information of the station, such as the identification information of the station, the time and frequency resource information used by the station for uplink transmission, and the like. The station receives the trigger frame or the trigger information field. If its own identification information is carried in it, it indicates that it is scheduled to be in the current UL MU transmission. If it needs to send data, it prepares and allocates the time and frequency resources allocated by the AP. Send on.

If the AP sends downlink data to multiple sites in the downlink multi-user mode, the trigger frame and downlink data sent to a site are usually aggregated and sent in an A-MPDU (Aggregate MAC Data Unit). The station receives the trigger frame and downlink data. After replying to the uplink data after a certain time interval and the acknowledgement frame for the downlink data, the uplink data and the acknowledgement frame may also be aggregated into one A-MPDU transmission. In the related art, the station needs to detect the channel before being triggered to send the uplink data, including the CCA detection and the NAV determination. When the channel is determined to be idle, the station may send an uplink physical layer data unit (Physical Protocol Data Unit, PPDU for short). When the channel is busy, if the transmission time length of the uplink PPDU does not exceed the predetermined threshold, it can be sent. If it is exceeded, it cannot be sent, so as to avoid causing large interference to other stations. The problem is that the acknowledgment frame of the downlink frame that is correctly received cannot be sent because the transmission time of the entire uplink PPDU exceeds the predetermined threshold, and the AP cannot receive the acknowledgment frame of the transmitted downlink frame. , may cause unnecessary retransmissions, wasting air resources.

In the related art, when the access point cannot receive the acknowledgement frame in time, the problem of unnecessary retransmission may be caused, and there is no effective solution at present.

Summary of the invention

The embodiment of the invention provides a data transmission method and device based on channel detection, so as to at least solve the problem that the access point cannot receive the acknowledgement frame in time in the related art, which may cause unnecessary retransmission.

According to an aspect of the embodiments of the present invention, a data transmission method based on channel detection is provided, including:

Receiving, by the station, a downlink physical layer protocol data unit PPDU sent by the access point, where the downlink PPDU carries downlink data sent to the station, and trigger information that triggers the station to perform uplink multi-user transmission;

The station performs channel detection, and when the detection result of the channel is busy, the station sends an uplink PPDU to the access point by using the uplink multi-user transmission manner, where the uplink PPDU message is sent. An acknowledgement frame carrying the downlink data.

Optionally, the station performs detection on all or part of the channels allocated by the trigger message for the station, or performs detection on all or part of channels used by the downlink PPDU.

Optionally, the manner of channel detection includes at least one of the following: virtual carrier detection; physical carrier detection.

Optionally, when the following conditions are met, determining that the detection result of the channel is busy: the virtual carrier detection or the physical carrier detection result of all or part of the channel for performing channel detection by the station is busy.

Optionally, the trigger information carries the following information: information used to indicate whether the channel performs the channel detection before performing the uplink multi-user transmission.

Optionally, the trigger information carries the following information: a transmission time length threshold value of the uplink PPDU sent by the station when the channel detection result is busy.

Optionally, the station sends an uplink PPDU to the access point by using the uplink multi-user transmission manner, including: when the detection result of the channel is busy, and the uplink PPDU does not exceed the transmission The time-length threshold, the station sends the uplink PPDU, where the uplink PPDU carries an acknowledgement frame for the downlink data, or carries the downlink number According to the confirmation frame and uplink data.

Optionally, the station sends an uplink PPDU to the access point by using the uplink multi-user transmission manner, including: when the detection result of the channel is busy, the uplink PPDU length is not affected by the transmission. Limiting the length of time threshold, the station sends the uplink PPDU to the access point, where the uplink PPDU carries an acknowledgement frame for the downlink data.

Optionally, when the trigger information does not include the transmission time length threshold, and the detection result of the channel is busy, the station carries the acknowledgement frame of the downlink data in the sent uplink PPDU. .

Optionally, the acknowledgement frame includes one of the following: an acknowledgement ACK frame, and a block acknowledgement Block ACK frame.

Optionally, the trigger information carries at least one of the following information:

The power parameter information is a modulation and coding mode MCS value, wherein a value of the transmission power of the uplink multi-user transmission by the station is determined by the power parameter.

Optionally, the trigger information carries the following information: when the detection result of the channel is busy, the detection threshold of the physical carrier detection is raised to obtain a lifting detection threshold, and the lifting detection threshold is used. The limit value is detected. If the channel detection result is idle, the station carries the acknowledgement frame of the downlink data in the sent uplink PPDU.

Optionally, the power parameter information includes at least one of the following: the sending power information of the station specified by the access point, the sending power information of the access point, the reference RSSI value, and the adjustment range of the reference RSSI value. .

Optionally, the acknowledgment frame is sent on all or part of uplink resources of the station indicated by the trigger information, where the part of the uplink resource is an uplink resource whose channel detection result is idle.

Optionally, the sending, by the acknowledgement frame, the all uplink resource or part of the uplink resource includes:

The station lowers the transmit power value to obtain a reduced power value, and the reduced power value, And sending the acknowledgement frame on all the uplink resources or part of the uplink resources.

Optionally, when the part of the uplink resource is used for sending, the ratio of the reduced power value to the sent power value is equal to a ratio of the part of the uplink resource to the total uplink resource.

Optionally, when the all uplink resource is sent, the reduced power value is determined by one or more parameters, and the RSSI and the sending of the access point are indicated according to the received received signal strength of the downlink PPDU. The power information determines a path loss value, and the reference RSSI value, the adjustment range of the reference RSSI value, is an interference detection result of all or part of channels allocated by the station.

Optionally, when the all uplink resource transmission is used, the reduced power value is determined according to the lifting detection threshold value when performing the physical carrier detection.

Optionally, the station sends the acknowledgement frame by using the MCS value in the trigger information, or the station adjusts the MCS value to send the acknowledgement frame.

Optionally, the station repeatedly sends the acknowledgement frame one or more times, and the length of the uplink PPDU sent by the station is equal to the length of the uplink PPDU indicated by the access point in the trigger information.

According to another aspect of the embodiments of the present invention, a data transmission apparatus based on channel detection is provided, which is applied to a station, and includes:

The receiving module is configured to receive a downlink physical layer protocol data unit (PPDU) sent by the access point, where the downlink PPDU carries downlink data sent to the station, and trigger information that triggers the station to perform uplink multi-user transmission;

The sending module is configured to perform channel detection, and when the detection result of the channel is busy, send an uplink PPDU to the access point by using the uplink multi-user transmission manner, where the uplink PPDU message is carried in the uplink PPDU message. The acknowledgement frame of the downlink data.

Optionally, the sending module includes: a detecting unit, configured to detect, on the all or part of the channels allocated by the station, the trigger message to the station, or all or the used in the downlink PPDU Detection is performed on some channels.

Optionally, the device further includes: a triggering module, configured to instruct the station to determine whether to trigger the channel detection according to the trigger information before performing the uplink multi-user transmission.

Optionally, the sending module includes: a first sending unit, configured to: when the detection result of the channel is busy, and the uplink PPDU does not exceed a transmission time length threshold, send the uplink PPDU, where The uplink PPDU carries an acknowledgement frame for the downlink data, or carries an acknowledgement frame and uplink data for the downlink data, where the transmission time length threshold value is carried in the trigger information.

Optionally, the sending module includes: a second sending unit, configured to: when the detection result of the channel is busy, the station sends the uplink PPDU to the access point, where the uplink PPDU The length is not limited by the length of the transmission time length, and the uplink PPDU carries an acknowledgement frame for the downlink data, and the transmission time length threshold value is carried in the trigger information.

Optionally, the sending module further includes: a third sending unit, configured to: when the trigger information does not carry the transmission time length threshold, and the detection result of the channel is busy, The acknowledgement frame of the downlink data is carried in the uplink PPDU.

Optionally, the sending module includes:

The first sending acknowledgement frame unit is configured to send the acknowledgement frame to all or part of uplink resources of the station indicated by the trigger information, where the part of the uplink resource is an uplink resource whose channel detection result is idle;

The second transmission acknowledgement frame unit is configured to transmit the acknowledgement frame by using the power value and/or the modulation and coding mode MCS value used by the station carried in the trigger information for the uplink multi-user transmission.

According to the embodiment of the present invention, the station receives the downlink physical layer protocol data unit PPDU sent by the access point, where the downlink PPDU carries downlink data sent to the station, and trigger information that triggers the station to perform uplink multi-user transmission; The station performs channel detection when the channel is When the detection result is busy, the station sends an uplink PPDU to the access point by means of the uplink multi-user transmission; wherein the uplink PPDU message carries the acknowledgement frame of the downlink data, which solves the problem that when the access point cannot be timely Receiving an acknowledgement frame may cause unnecessary retransmission and avoid waste of air interface resources.

DRAWINGS

The accompanying drawings are intended to provide a further understanding of the embodiments of the embodiments of the invention Improper limitations. In the drawing:

1 is a diagram showing an example of a WLAN basic service set BSS according to the related art;

2 is a schematic diagram of a multi-user transmission frame exchange embodiment according to the related art;

3 is a flowchart of a data transmission method based on channel detection according to an embodiment of the present invention;

4 is a block diagram 1 of a structure of a data transmission apparatus based on channel detection according to an embodiment of the present invention;

FIG. 5 is a second structural block diagram of a data transmission apparatus based on channel detection according to an embodiment of the present invention; FIG.

6 is a structural block diagram 3 of a data transmission apparatus based on channel detection according to an embodiment of the present invention;

7 is a structural block diagram 4 of a data transmission apparatus based on channel detection according to an embodiment of the present invention;

FIG. 8 is a structural block diagram 5 of a data transmission apparatus based on channel detection according to an embodiment of the present invention; FIG.

9 is a structural block diagram 6 of a data transmission apparatus based on channel detection according to an embodiment of the present invention;

FIG. 10 is a structural block diagram 7 of a data transmission apparatus based on channel detection according to an embodiment of the present invention; FIG.

11 is a first schematic diagram of a PDDU acknowledgement frame in accordance with an alternative embodiment of the present invention;

12 is a second schematic diagram of a PDDU acknowledgement frame in accordance with an alternative embodiment of the present invention;

13 is a third schematic diagram of a PDDU acknowledgment frame in accordance with an alternate embodiment of the present invention.

detailed description

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict.

It should be noted that the terms "first", "second" and the like in the specification and claims of the embodiments of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. order.

In this embodiment, a data transmission method based on channel detection is provided. FIG. 3 is a flowchart of a data transmission method based on channel detection according to an embodiment of the present invention. As shown in FIG. 3, the process includes the following steps. :

Step S302: The station receives a downlink physical layer protocol data unit (PPDU) sent by the access point, where the downlink PPDU carries downlink data sent to the station, and trigger information that triggers the station to perform uplink multi-user transmission;

In step S304, the station performs channel detection. When the detection result of the channel is busy, the station sends an uplink PPDU to the access point by using the uplink multi-user transmission manner, where the uplink PPDU message carries the downlink. The confirmation frame of the data.

Through the foregoing steps, the station receives the downlink physical layer protocol data unit (PPDU) sent by the access point, where the downlink PPDU carries the downlink data sent to the station, and the trigger information that triggers the station to perform uplink multi-user transmission, where the station performs Channel detection, when the detection result of the channel is busy, the station sends an uplink PPDU to the access point by using the uplink multi-user transmission manner, where the uplink PPDU message carries the acknowledgement frame of the downlink data, and the solution is solved. When the access point cannot receive the acknowledgement frame in time, it may cause unnecessary retransmission and avoid waste of air interface resources.

In this embodiment, performing channel detection by the station includes: detecting, by the station, all or part of the channels allocated by the trigger message for the station, or detecting on all or part of channels used by the downlink PPDU.

In this embodiment, the manner of channel detection includes at least one of the following: virtual carrier detection; physical carrier detection.

In this embodiment, when the following conditions are met, it is determined that the detection result of the channel is busy: the virtual carrier detection or the physical carrier detection result of all or part of the channel for performing channel detection is busy, virtual carrier detection and physical carrier detection. At least one of the stations detects that the channel is busy, and the site detection result is busy.

In this embodiment, the trigger information carries the following information: used to indicate whether the station triggers the information for performing the channel detection before performing the uplink multi-user transmission.

In this embodiment, the trigger information carries the following information: a transmission time length threshold value of the uplink PPDU sent by the station when the channel detection result is busy.

In this embodiment, the station sends an uplink PPDU to the access point by using the uplink multi-user transmission manner, including: when the detection result of the channel is busy, and the uplink PPDU does not exceed the transmission time length threshold When the value is received, the station sends the uplink PPDU, where the uplink PPDU carries an acknowledgement frame for the downlink data, or carries an acknowledgement frame and uplink data for the downlink data.

In this embodiment, the station sends an uplink PPDU to the access point by using the uplink multi-user transmission manner, including: when the detection result of the channel is busy, the length of the uplink PPDU is not limited by the length of the transmission time. The value is limited, the station sends the uplink PPDU to the access point, where the uplink PPDU carries an acknowledgement frame for the downlink data.

In this embodiment, the method further includes: when the trigger information does not include the transmission time length threshold, and the detection result of the channel is busy, the station carries the acknowledgement frame of the downlink data in the sent uplink PPDU.

In this embodiment, the acknowledgement frame includes at least one of: an acknowledgement ACK frame, and a block acknowledgement Block ACK frame.

In this embodiment, the trigger information carries at least one of the following information:

The power parameter information is a modulation and coding mode MCS value, wherein a value of the transmission power of the uplink multi-user transmission of the station is determined by the power parameter.

In this embodiment, the trigger information carries the following information: when the detection result of the channel is busy, the detection threshold of the enhanced physical carrier detection is increased by the detection threshold, and the lifting detection threshold is used. If the channel detection result is idle, the station carries the acknowledgement frame of the downlink data in the sent uplink PPDU.

In this embodiment, the power parameter information includes at least one of the following: the transmit power information of the site specified by the access point, the transmit power information of the access point, the reference RSSI value, and the adjustment range of the reference RSSI value.

In this embodiment, the acknowledgment frame is sent on all or part of the uplink resources of the station indicated by the trigger information, where the part of the uplink resource is an uplink resource whose channel detection result is idle.

In this embodiment, the sending, by the acknowledgement frame, the all uplink resource or part of the uplink resource includes:

The station lowers the transmit power value to obtain a reduced power value, and sends the acknowledgement frame on the entire uplink resource or part of the uplink resource by the reduced power value.

In this embodiment, when the part of the uplink resource is used for sending, the ratio of the reduced power value to the sent power value is equal to the ratio of the part of the uplink resource to the total uplink resource.

In this embodiment, when the all uplink resource is used for transmission, the reduced power value is determined by one or more parameters, and the RSSI and the transmit power information of the access point are indicated according to the received signal strength of the received downlink PPDU. Determining the path loss value, the reference RSSI value, and the adjustment range of the reference RSSI value, is the interference detection result of all or part of the channels allocated by the station.

In this embodiment, when the all uplink resource transmission is used, the reduced power value is determined according to the lifting detection threshold value when the physical carrier detection is performed.

In this embodiment, the station sends the acknowledgement frame by using the MCS value in the trigger information. Alternatively, the station adjusts the MCS value to send the acknowledgement frame.

In this embodiment, the station repeatedly sends the acknowledgement frame one or more times, and the length of the uplink PPDU sent by the station is equal to the length of the uplink PPDU indicated by the access point in the trigger information. A data transmission device based on the channel detection is also provided in the embodiment, and the device is used to implement the foregoing embodiments and optional implementations, and details are not described herein. As used below, the term "module" may implement a combination of software and/or hardware of a predetermined function. Although the apparatus described in the following embodiments is preferably implemented in software, hardware, or a combination of software and hardware, is also possible and contemplated.

4 is a block diagram of a structure of a data transmission apparatus based on channel detection, which is applied to a station. As shown in FIG. 4, the apparatus includes:

The receiving module 42 is configured to receive a downlink physical layer protocol data unit (PPDU) sent by the access point, where the downlink PPDU carries downlink data sent to the station, and trigger information that triggers the station to perform uplink multi-user transmission;

The sending module 44 is configured to perform channel detection. When the detection result of the channel is busy, the uplink PPDU is sent to the access point by using the uplink multi-user transmission manner, where the downlink data is carried in the uplink PPDU message. Confirmation frame.

Through the above steps, the receiving module 42 receives the downlink physical layer protocol data unit PPDU sent by the access point, where the downlink PPDU carries the downlink data sent to the station, and trigger information that triggers the station to perform uplink multi-user transmission, and sends The module 44 performs channel detection. When the detection result of the channel is busy, the station sends an uplink PPDU to the access point by using the uplink multi-user transmission manner, where the uplink PPDU message carries the confirmation of the downlink data. The frame solves the problem that when the access point cannot receive the acknowledgement frame in time, it may cause unnecessary retransmission, and avoid waste of air interface resources.

FIG. 5 is a block diagram of a structure of a data transmission apparatus based on channel detection according to an embodiment of the present invention. As shown in FIG. 5, the sending module 44 further includes:

The detecting unit 52 is configured to detect, on the channel, all or part of the channel allocated by the trigger message to the station, or to all or part of the channel used by the downlink PPDU. Line detection.

FIG. 6 is a structural block diagram 3 of a data transmission apparatus based on channel detection according to an embodiment of the present invention. As shown in FIG. 6, the apparatus includes, in addition to all the modules shown in FIG.

The triggering module 62 is configured to instruct the station to determine whether to trigger the channel detection according to the trigger information before performing the uplink multi-user transmission.

FIG. 7 is a structural block diagram of a data transmission apparatus based on channel detection according to an embodiment of the present invention. As shown in FIG. 7, the transmitting module 44 further includes:

The first sending unit 72 is configured to send the uplink PPDU when the detection result of the channel is busy, and the uplink PPDU does not exceed the transmission time length threshold, where the uplink PPDU carries the downlink data. The acknowledgement frame or the acknowledgement frame and the uplink data of the downlink data, and the transmission time length threshold value is carried in the trigger information.

FIG. 8 is a block diagram 5 of a structure of a data transmission apparatus based on channel detection according to an embodiment of the present invention. As shown in FIG. 8, the sending module 44 further includes:

The second sending unit 82 is configured to send the uplink PPDU to the access point when the detection result of the channel is busy, wherein the uplink PPDU length is not limited by the transmission time length threshold, and the uplink PPDU is Carrying an acknowledgement frame for the downlink data, the transmission time length threshold value is carried in the trigger information.

FIG. 9 is a structural block diagram 6 of a data transmission apparatus based on channel detection according to an embodiment of the present invention. As shown in FIG. 9, the sending module 44 further includes:

The third sending unit 92 is configured to carry the acknowledgement frame of the downlink data in the sent uplink PPDU when the trigger information does not carry the transmission time length threshold and the detection result of the channel is busy.

FIG. 10 is a structural block diagram of a data transmission apparatus based on channel detection according to an embodiment of the present invention. As shown in FIG. 10, the transmitting module 44 further includes:

The first sending acknowledgement frame unit 102 is configured to send the acknowledgement frame on all or part of uplink resources of the station indicated by the trigger information, where the part of the uplink resource is channel detection. The result is an idle uplink resource;

The second transmission confirmation frame unit 104 is configured to transmit the acknowledgement frame using the power value and/or the modulation and coding mode MCS value used by the station carried in the trigger information for the uplink multi-user transmission.

It should be noted that each of the above modules may be implemented by software or hardware. For the latter, the foregoing may be implemented by, but not limited to, the foregoing modules are all located in the same processor; or, the modules are located in multiple In the processor.

In the embodiment of the present invention, a data transmission device based on channel detection is further provided, which comprises the channel transmission based data transmission device in the above implementation. The embodiments of the present invention are described in detail below with reference to alternative embodiments and embodiments.

Embodiment 1

11 is a first schematic diagram of a PPDU acknowledgement frame, as shown in FIG. 11, in accordance with an alternative embodiment of the present invention. The AP uses the downlink multi-user transmission mode to send downlink MU PPDUs to the three stations STA1, STA2, and STA3 associated with it. Taking STA1 as an example, the downlink MU PPDU includes downlink data for STA1 and trigger information for triggering STA1 to perform uplink transmission. The trigger information may be a trigger frame or an information field carried in the header of the downlink data.

After receiving the downlink PPDU, the STA1 needs to confirm the downlink data, and the downlink PPDU includes the trigger information, which indicates the location of the channel resource used by the STA1 for the uplink multi-user transmission. The trigger information further includes: whether the channel performs channel detection, the length of the uplink MU PPDU, the channel detection result is the transmission time length threshold value, the power parameter information, and the MCS value before transmitting the uplink MU PPDU. The power parameter may include: the transmit power of the STA1 specified by the AP, the transmit power of the AP, the Received Signal Strength Indication (Received Signal Strength Indication), or the adjustment range of the reference RSSI value. The station determines its own transmit power based on the power parameter information.

The AP indicates that the station performs channel detection before transmitting the uplink MU PPDU, and STA1 should perform channel detection on part or all of the uplink transmission resources of STA1 indicated in the trigger information, or all or the received downlink PPDUs are occupied. Detection on some channels, package The physical carrier detection CCA and the determination of whether the NAV is idle are included. If only one resource unit RU is allocated for the uplink multi-user transmission of the station in the trigger information, the station should at least detect the 20 MHz channel bandwidth to which the RU belongs.

The STA1 detection result finds that all or part of the channel for which the channel detection is performed is busy. If the station only sends an acknowledgement frame (ACK frame or BA frame) for the downlink data, the station can ignore the transmission time length threshold when the channel detection result is busy. The value is limited and is sent on all channels. Alternatively, when some of the channels are idle, the station transmits on the idle channel.

When all channels are used for transmission, the station raises the CCA detection threshold from the original CCA Level 1 to CCA Level 2, and obtains an acknowledgment frame if the detection result is that the channel is idle. When transmitting on all channels, the station reduces power transmission to reduce interference, and the reduced power value is determined according to the CCA Level 2-CCA Level 1.

When all channels are used for transmission, the station may also determine the path loss value according to the RSSI of the DL PPDU received by the AP and the transmission power of the AP, and refer to the adjustment range of the RSSI value according to the reference RSSI value, and allocate all or part of the station to the station. The interference detection result of the channel, one or more of the parameters of the path loss determines its own transmission power value.

The station can transmit using the MCS indicated by the AP, or adjust the MCS. If the MCS is adjusted, the AP needs to perform blind detection on the MCS when receiving the uplink PPDU.

In the uplink PPDU, the station can send the acknowledgment frame once, or repeatedly, to ensure that it is received correctly. If repeated transmission is taken, the MCS value indicated by the AP can be directly used. Since the AP sends the length parameter of the uplink MU PPDU, that is, the AP has the length requirement for the uplink multi-user PPDU of each STA, and the end time of the uplink multi-user PPDU of each STA is the same, if the acknowledgement frame is repeated multiple times, it needs to be guaranteed to be equal to Upstream PPDU length. If the remaining bytes are not enough to send a complete acknowledgment frame after repeated several times, a padding operation is performed to fill the length of the uplink multi-user PPDU specified by the AP.

When transmitting using a channel that detects idle, since the part of the channel to which the station is allocated is used, the station needs to lower the power transmission acknowledgement frame. Specifically, the bandwidth ratio M/N of the idle channel bandwidth M and the channel bandwidth N allocated to the station for uplink transmission can be calculated, The ratio of the transmit power value actually used by the station to the transmit power of the site specified by the AP is also M/N. The station can transmit using the MCS indicated by the AP, or adjust the MCS. If the MCS is adjusted, the AP needs to perform blind detection on the MCS when receiving the uplink PPDU. The station may send the acknowledgment frame one or more times, and the operation is similar to the case where the entire channel bandwidth is used for transmission, and will not be described again.

Embodiment 2

FIG. 12 is a second schematic diagram of a PPDU acknowledgement frame according to an alternative embodiment of the present invention, as shown in FIG. The downlink multi-user transmission mode is used by the AP to send downlink MU PPDUs to multiple sites associated with the downlink MU PPDU, and the downlink MU PPDU includes downlink data for the station and trigger information for triggering the uplink transmission of the station. The trigger information may be a trigger frame or an information field carried in the header of the downlink data.

After receiving the downlink PPDU, the station needs to confirm the downlink data, and the downlink PPDU includes the trigger information, which indicates the location of the channel resource used by the station for uplink multi-user transmission. The trigger information further includes: whether the channel performs channel detection, the length of the uplink MU PPDU, the channel detection result is the transmission time length threshold value, the power parameter information, and the MCS value before transmitting the uplink MU PPDU. The power parameters may include: the transmit power of the site specified by the AP, the transmit power of the AP, the reference RSSI value (the signal strength indication received by the Received Signal Strength Indication), or the adjustment range of the reference RSSI value. The station determines its own transmit power based on the power parameter information.

The AP instructs the station to perform channel detection before transmitting the uplink MU PPDU, and the station should perform channel detection on part or all of the uplink transmission resources of the station indicated in the trigger information, or all or the received downlink PPDUs are occupied. Detection is performed on a part of the channel, including physical carrier detection CCA, and determination of whether the NAV is idle. If only one resource unit RU is allocated for the uplink multi-user transmission of the station in the trigger information, the station should at least detect the 20 MHz channel bandwidth to which the RU belongs.

The site detection result indicates that all or part of the channels used by the UE are busy, and the AP indicates that the channel detection result is a limitation of the transmission time length threshold when the channel is busy, and the station needs to send an acknowledgement frame. Ensure that the confirmation frame length does not exceed this threshold. Specifically, the station may use the entire bandwidth indicated in the trigger frame to transmit, or use the channel detection result to be idle channel transmission, and adjust the MCS to ensure that the transmitted uplink PPDU length does not exceed the threshold.

When all channels are used for transmission, the station raises the CCA detection threshold from CCA Level 1 to CCA Level 2, and obtains an acknowledgment frame if the detection result is that the channel is idle. When transmitting on all channels, the station reduces power transmission to reduce interference, and the reduced power value is determined according to the CCA Level 2-CCA Level 1.

In the uplink PPDU, the station can send the acknowledgment frame once, or repeatedly, to ensure that it is received correctly. If repeated transmission is taken, the MCS value indicated by the AP can be directly used. The station can also send uplink data in addition to the acknowledgement frame, so that the overall length of the uplink data and the acknowledgement frame does not exceed the limit of the transmission time length threshold when the channel detection result is busy.

When transmitting using a channel that detects idle, since the part of the channel to which the station is allocated is used, the station needs to lower the power transmission acknowledgement frame. Specifically, the bandwidth ratio M/N of the idle channel bandwidth M and the channel bandwidth N allocated to the station for uplink transmission can be calculated, and the ratio of the actually used transmission power value to the transmission power of the AP station is also M/N. The station can transmit using the MCS indicated by the AP, or adjust the MCS. If the MCS is adjusted, the AP needs to perform blind detection on the MCS when receiving the uplink PPDU. The site can send the confirmation frame once or repeatedly to ensure it is received correctly. The station can also send uplink data in addition to the acknowledgement frame, so that the overall length of the uplink data and the acknowledgement frame does not exceed the limit of the transmission time length threshold when the channel detection result is busy.

Embodiment 3

FIG. 13 is a schematic diagram 3 of a PPDU acknowledgment frame according to an alternative embodiment of the present invention. As shown in FIG. 13, the AP uses a downlink multi-user transmission mode to send downlink MU PPDUs to multiple sites associated with the downlink MU PPDU. The downlink data for the site and the trigger information that triggers the site for uplink transmission. The trigger information may be a trigger frame or an information field carried in the header of the downlink data.

After receiving the downlink PPDU, the station needs to confirm the downlink data, and the downlink PPDU includes the trigger information, which indicates the location of the channel resource used by the station for uplink multi-user transmission. The trigger information further includes: whether the channel performs channel detection, the length of the uplink MU PPDU, the power parameter information, and the MCS value before transmitting the uplink MU PPDU. The power parameter may include: the transmit power of the STA1 specified by the AP, the transmit power of the AP, the reference RSSI value (the signal strength indication received by the Received Signal Strength Indication), or the adjustment range of the reference RSSI value. The station determines its own transmit power based on the power parameter information.

The site detection result finds that all or part of the bandwidth used by itself is busy. If the station only sends an acknowledgement frame for the downlink data, the station can ignore the channel detection result and transmit on all channels. Alternatively, when some of the channels are idle, the station transmits on the idle channel.

When transmitting on all channels, the station can also receive the DL PPDU of the AP according to itself. The RSSI and the transmit power of the AP determine the path loss value, and according to the reference RSSI value, refer to the adjustment range of the RSSI value, and the interference detection result of all or part of the channels allocated to the station, one or more of the path loss parameters are determined. Your own transmit power value.

When transmitting using a channel that detects idle, since the part of the channel to which the station is allocated is used, the station needs to lower the power transmission acknowledgement frame. Specifically, the bandwidth ratio M/N of the idle channel bandwidth M and the channel bandwidth N allocated to the station for uplink transmission can be calculated, and the ratio of the actually used transmit power value to the transmit power of the site designated by the AP is also M. /N. The station can transmit using the MCS indicated by the AP, or adjust the MCS. If the MCS is adjusted, the AP needs to perform blind detection on the MCS when receiving the uplink PPDU. The station may send the acknowledgment frame one or more times, and the operation is similar to the case where the entire channel bandwidth is used for transmission, and will not be described again.

Through the description of the above embodiments, those skilled in the art can clearly understand that the method according to the above embodiment can be implemented by means of software plus a necessary general hardware platform, and of course, by hardware, but in many cases, the former is A better implementation. Based on such understanding, the technical solution of the embodiments of the present invention may be embodied in the form of a software product in essence or in the form of a software product stored in a storage medium (such as ROM/RAM, magnetic). a disc, an optical disc, including a number of instructions for causing a terminal device (which may be a mobile phone, a computer, a server, or a network device, etc.) to perform various implementations of the present invention The method described in the example.

In the embodiment of the present invention, a computer storage medium is further provided, and the computer storage medium may store an execution instruction for executing the method in the foregoing embodiment. .

Optionally, in this embodiment, the foregoing storage medium may include, but not limited to, a USB flash drive, a Read-Only Memory (ROM), a Random Access Memory (RAM), a mobile hard disk, and a magnetic memory. A variety of media that can store program code, such as a disc or a disc.

Optionally, in this embodiment, the processor performs the method steps of the foregoing embodiments according to the stored program code in the storage medium.

For example, the specific examples in this embodiment may refer to the examples described in the foregoing embodiments and the optional embodiments, and details are not described herein again.

Obviously, those skilled in the art should understand that the above modules or steps of the embodiments of the present invention can be implemented by a general computing device, which can be concentrated on a single computing device or distributed in multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device such that they may be stored in the storage device by the computing device and, in some cases, may be different from The steps shown or described are performed sequentially, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps thereof are fabricated into a single integrated circuit module. Thus, embodiments of the invention are not limited to any specific combination of hardware and software.

The above description is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to 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.

Industrial applicability

Based on the foregoing technical solution provided by the present invention, the station receives a downlink physical layer protocol data unit PPDU sent by the access point, where the downlink PPDU carries downlink data sent to the station, And triggering information for triggering the uplink multi-user transmission of the station; the station performs channel detection, and when the detection result of the channel is busy, the station sends an uplink PPDU to the access point by using the uplink multi-user transmission manner; The acknowledgment frame of the downlink data is carried in the uplink PPDU message, which solves the problem that the access point cannot receive the acknowledgment frame in time in the related art, which may cause unnecessary retransmission, and avoids waste of air interface resources.

Claims

A data transmission method based on channel detection, comprising:

Receiving, by the station, a downlink physical layer protocol data unit PPDU sent by the access point, where the downlink PPDU carries downlink data sent to the station, and trigger information that triggers the station to perform uplink multi-user transmission;

The station performs channel detection, and when the detection result of the channel is busy, the station sends an uplink PPDU to the access point by using the uplink multi-user transmission manner, where the uplink PPDU message is sent. An acknowledgement frame carrying the downlink data.
The method of claim 1 wherein said station performing channel detection comprises:

The station performs detection on all or part of the channels allocated by the trigger message for the station, or performs detection on all or part of channels used by the downlink PPDU.
The method of claim 1 wherein the manner of channel detection comprises at least one of:

Virtual carrier detection; physical carrier detection.
The method of claim 1, wherein the detection result of the channel is determined to be busy when the following conditions are met:

The virtual carrier detection or physical carrier detection result of all or part of the channels for which the station performs channel detection is busy.
The method according to claim 1, wherein the trigger information carries the following information:

And means for indicating whether the channel performs the channel detection before performing the uplink multi-user transmission.
The method of claim 1 wherein said trigger information carries The following information:

The transmission time length threshold value of the uplink PPDU sent by the station when the channel detection result is busy.
The method of claim 6, wherein the station sends an uplink PPDU to the access point by means of the uplink multi-user transmission, including:

When the detection result of the channel is busy, and the uplink PPDU does not exceed the transmission time length threshold, the station sends the uplink PPDU, where the uplink PPDU carries the downlink An acknowledgment frame of data, or an acknowledgment frame and uplink data for the downlink data.
The method of claim 6, wherein the station sends an uplink PPDU to the access point by means of the uplink multi-user transmission, including:

When the detection result of the channel is busy, the uplink PPDU length is not limited by the transmission time length threshold, and the station sends the uplink PPDU to the access point, where the uplink The PPDU carries an acknowledgement frame for the downlink data.
The method of claim 1 further comprising:

When the trigger information does not include the transmission time length threshold, and the detection result of the channel is busy, the station carries the acknowledgement frame of the downlink data in the sent uplink PPDU.
The method of any one of claims 1 to 9, wherein the confirmation frame comprises one of the following:

Acknowledge the ACK frame and the block acknowledges the Block ACK frame.
The method according to claim 1, wherein the trigger information carries at least one of the following information:

Power parameter information, modulation coding mode MCS value, wherein the site is performed The transmit power value of the row multi-user transmission is determined by the power parameter.
The method according to claim 11, wherein the trigger information carries the following information:

When the detection result of the channel is busy, the detection threshold of the physical carrier detection is raised to obtain a lifting detection threshold, and the detection threshold is used to detect, if the channel detection result is idle, then The station carries the acknowledgement frame of the downlink data in the sent uplink PPDU.
The method according to claim 12, wherein the power parameter information comprises at least one of: transmission power information of the station specified by the access point, transmission power information of the access point, and reference to the received The signal strength indicates the RSSI value, referring to the adjustment range of the RSSI value.
The method of claim 13 wherein

The acknowledgment frame is sent on all or part of uplink resources of the station indicated by the trigger information, where the part of the uplink resource is an uplink resource whose channel detection result is idle.
The method of claim 14, wherein the transmitting the acknowledgement frame on the all uplink resources or part of the uplink resources comprises:

The station reduces the transmit power value, obtains a reduced power value, and sends the acknowledgement frame on the all uplink resource or part of the uplink resource by using the reduced power value.
The method according to claim 15, wherein when the partial uplink resource is used for transmission, a ratio of the reduced power value to the transmit power value is equal to a ratio of the partial uplink resource to the total uplink resource.
The method of claim 15 wherein

When the all uplink resource is used for transmission, the reduced power value is determined by one or Determining, by the plurality of parameters, the path loss value determined according to the received signal strength indication RSSI value of the downlink PPDU and the transmission power information of the access point, the reference RSSI value, and the reference RSSI value The adjustment range is the interference detection result of all or part of the channels allocated to the station.
The method of claim 15 wherein

When the all uplink resource transmission is used, the reduced power value is determined according to the lifting detection threshold value when the physical carrier detection is performed.
The method of claim 12, wherein the station transmits the acknowledgement frame using the MCS value in the trigger information, or the station adjusts the MCS value to send the acknowledgement frame.
The method according to claim 1, wherein the station repeatedly transmits the acknowledgement frame one or more times, and the length of the uplink PPDU sent by the station is equal to that indicated by the access point in the trigger information. The length of the upstream PPDU.
A data transmission device based on channel detection is applied to a station, and the device includes:

The receiving module is configured to receive a downlink physical layer protocol data unit (PPDU) sent by the access point, where the downlink PPDU carries downlink data sent to the station, and trigger information that triggers the station to perform uplink multi-user transmission;

The sending module is configured to perform channel detection, and when the detection result of the channel is busy, send an uplink PPDU to the access point by using the uplink multi-user transmission manner, where the uplink PPDU message is carried in the uplink PPDU message. The acknowledgement frame of the downlink data.
The apparatus of claim 21 wherein said transmitting module comprises:

The detecting unit is configured to detect, on the channel, all or part of the channels allocated by the station for the trigger message, or perform detection on all or part of channels used by the downlink PPDU.
The device of claim 21, wherein the device further comprises:

The triggering module is configured to instruct the station to determine whether to trigger the channel detection according to the trigger information before performing the uplink multi-user transmission.
The apparatus of claim 21 wherein said transmitting module comprises:

The first sending unit is configured to send the uplink PPDU when the detection result of the channel is busy, and the uplink PPDU does not exceed the transmission time length threshold, where the uplink PPDU carries the opposite The acknowledgement frame of the downlink data, or the acknowledgement frame and the uplink data that carries the downlink data, where the transmission time length threshold value is carried in the trigger information.
The apparatus of claim 21 wherein said transmitting module comprises:

a second sending unit, configured to send the uplink PPDU to the access point when the detection result of the channel is busy, where the uplink PPDU length is not limited by the transmission time length threshold And the uplink PPDU carries an acknowledgement frame for the downlink data, where the transmission time length threshold value is carried in the trigger information.
The device of claim 21, wherein the sending module further comprises:

a third sending unit, configured to: when the trigger information does not carry the transmission time length threshold, and the detection result of the channel is busy, carry the acknowledgement frame of the downlink data in the sent uplink PPDU .
The apparatus according to any one of claims 21 to 26, wherein the confirmation frame comprises one of the following:

Acknowledge the ACK frame and the block acknowledges the Block ACK frame.
The apparatus of claim 27, wherein the transmitting module comprises:

a first sending acknowledgement frame unit, configured to send the acknowledgement frame on all or part of uplink resources of the site indicated by the trigger information, where the part of the uplink resource is The source is an uplink resource whose channel detection result is idle;

The second transmission acknowledgement frame unit is configured to transmit the acknowledgement frame by using the power value and/or the modulation and coding mode MCS value used by the station carried in the trigger information for the uplink multi-user transmission.
A data transmission device based on channel detection, comprising the device of any one of claims 21 to 28.
A computer storage medium storing execution instructions for performing the method of any one of claims 1 to 20.