WO2017152727A1

WO2017152727A1 - Data transmission method and apparatus

Info

Publication number: WO2017152727A1
Application number: PCT/CN2017/072262
Authority: WO
Inventors: 王静; 罗俊; 于健
Original assignee: 华为技术有限公司
Priority date: 2016-03-10
Filing date: 2017-01-23
Publication date: 2017-09-14
Also published as: CN107182127A; CN107182127B

Abstract

Disclosed in the present invention are a data transmission method and apparatus, relating to the field of wireless communication technology. The method comprises: acquiring from a channel data frames of other BSS transmission; on the basis of the information carried in the data frames, determining whether to enable spatial reuse transmission; and when deciding to enable spatial reuse transmission, using thresholds competitively on the channel to implement spatial reuse transmission; the problem of low data throughput and the low opportunity of communication for STA located in an OBSS region is resolved, and whether or not spatial reuse can be enabled is determined by means of existing information only, without the need to add additional information to transmitted data packets, thus saving STA energy and improving the opportunity for spatial reuse.

Description

Data transmission method and device

The present application claims the priority of the Chinese Patent Application, filed on March 10, 2016, which is hereby incorporated by reference.

Technical field

Embodiments of the present invention relate to the field of wireless communications, and in particular, to a data transmission method and apparatus.

Background technique

Wireless Fidelity (WiFi) systems include: Wireless Access Point (AP) and Station (STA). The AP can be a wireless router and the STA can be a mobile terminal. With the development of communication technologies, especially the number of users being served, data transmission using traditional transmission mechanisms often fails to utilize limited frequency band resources to meet the needs of individual users. Therefore, for user-intensive scenarios, Spatial Reuse (SR) technology is proposed. The space reuse technology mainly aims to perform concurrent transmission of data as much as possible in the case of APs or STAs in different BSSs without interfering with neighboring BSSs. That is, at the same time, data transmission between different devices and their respective peer devices is completed by the same time-frequency resource.

Currently, the criterion for spatial reuse is based on the Basic Service Set color (BSS color)/Medium Access Control header (MAC header) to determine whether a data packet comes from an overlapping BSS (Overlapping BSS, OBSS). ), and based on the judgment result to determine whether it is possible to spatially multiplex its own spatial transmission resources. For example, only when the STA or the AP monitors the BSS color information carried by the frame header of the data frame does not match its BSS color information, or the MAC header carried by the frame header of the monitored data frame does not match its own MAC header. At this time, the STA or AP will spatially reuse its own space transmission resources.

How to more accurately set the criteria for spatial reuse, which is used to improve the communication opportunities and data throughput of STAs in the OBSS area, is a technical problem that needs to be solved.

Summary of the invention

In order to solve the problem of more accurately setting the spatial reuse, to improve the communication opportunities and data throughput of the STAs in the OBSS area, the embodiment of the present invention provides a data transmission method and apparatus. The technical solution is as follows:

In a first aspect, an embodiment of the present invention provides a data transmission method, where the method includes:

Obtaining a data frame of transmission of the other BSS from the channel; determining whether to enable spatial reuse transmission according to information carried in the data frame; when determining to enable the space reuse transmission, using a threshold in a competitive manner in the Space reuse transmission on the channel.

The data transmission method provided by the embodiment of the present invention determines whether the spatial reuse transmission is enabled according to the information carried in the data frame by acquiring the data frame of the transmission of the other BSS from the channel, and when the space reuse transmission is determined to be enabled, the threshold is used. The method of competition performs spatial reuse transmission on the channel; solves the problem that the STAs located in the OBSS area have less communication opportunities and the data throughput is not high;

The information in the transmitted data packet can be judged whether the space can be reused only by the existing information, thereby saving the energy of the STA and improving the chance of space reuse.

In a first possible implementation manner of the first aspect, the information carried in the data frame includes: a physical layer protocol Determining whether to enable spatial reuse of the SR transmission according to the information carried in the data frame, including: detecting whether the duration of the PPDU carried in the data frame is greater than a first threshold; If the duration of the PPDU is greater than the first threshold, it is determined that the space reuse transmission is enabled.

In a second possible implementation manner of the first aspect, the information carried in the data frame includes: a duration of a transmission opportunity TXOP, and determining, according to information carried in the data frame, whether space reuse transmission is enabled, Including: detecting the said

Whether the duration of the TXOP carried in the transmitted data frame is greater than a second threshold; if the duration of the TXOP is greater than the second threshold, determining to enable the spatial reuse transmission.

In a third possible implementation manner of the first aspect, the information carried in the data frame includes: a format field in the signaling SIG-A, a downlink DL/uplink UL domain in the SIG-A, and a legacy message. Determining a Length Length field in the L-SIG; determining, according to information carried in the data frame, whether to enable spatial reuse transmission, including: if the data frame is an uplink single user frame or a downlink single user frame, determining Enabling the spatial reuse transmission; or, if the data frame is an uplink multi-user frame, determining to enable the spatial reuse transmission.

In a fourth possible implementation manner of the first aspect, the information carried in the data frame includes: a format field in the signaling SIG-A, a downlink DL/uplink UL field in the SIG-A, and a legacy message. Determining a Length Length field in the L-SIG; determining, according to the information carried in the data frame, whether to enable spatial reuse transmission, if: if the data frame is a downlink multi-user frame, determining to disable the Space reuse transmission.

In a fifth possible implementation manner of the first aspect, the information carried in the data frame includes: a format field in the signaling SIG-A, a downlink DL/uplink UL domain in the SIG-A, and a legacy message. Determining a Length Length field in the L-SIG; determining, according to information carried in the data frame, whether to enable spatial reuse transmission, including: if the data frame is a downlink multi-user frame, before detecting the data frame Whether there is a request to send an RTS data frame and a clear transmission CTS data frame in the data frame; if the RTS data frame and the CTS data frame are present, it is determined that the space reuse transmission is enabled.

In a sixth possible implementation manner of the first aspect, the information carried in the transmitted data frame includes: a format field in the signaling SIG-A, a downlink DL/uplink UL field in the SIG-A, a length of the modulation coding scheme MCS field in the SIG-A and a length of the legacy signaling L-SIG; determining, according to information carried in the data frame, whether to enable spatial reuse transmission, including: If the data frame is an uplink single-user frame or a downlink single-user frame, it is detected whether the MCS level is greater than the first level; if the MCS level is greater than the first level, determining that the space reuse transmission is enabled.

In a seventh possible implementation manner of the first aspect, the information carried in the data frame includes: a format field in the signaling SIG-A, a downlink DL/uplink UL field in the SIG-A, the a length and a length field in a modulation coding scheme MCS field and a conventional signaling L-SIG in the SIG-A; determining, according to information carried in the data frame, whether to enable spatial reuse transmission, including: if the data frame If it is a downlink multi-user frame, detecting whether the MCS level is greater than the first level; if the MCS level is greater than the first level, determining to enable the space reuse to transmit the indication of the SIG-A in the data frame Whether the MCS level of the SIG-B is greater than the second level; if the MCS level is greater than the second level, it is determined to enable the space reuse transmission.

In an eighth possible implementation manner of the first aspect, the information carried in the data frame includes: a format field in the signaling SIG-A, a downlink DL/uplink UL field in the SIG-A, the a length and a length field in a modulation coding scheme MCS field and a conventional signaling L-SIG in the SIG-A; determining, according to information carried in the data frame, whether to enable spatial reuse transmission, including: if the data frame For the uplink multi-user frame, detecting the trigger frame before the data frame Whether the MCS levels of the respective STAs are all greater than the third level; if the MCS levels of the respective STAs are all greater than the third level, it is determined that the space reuse transmission is enabled.

Combining the first aspect, the first possible implementation of the first aspect or the second possible implementation of the first aspect or the third possible implementation of the first aspect or the fourth possible implementation of the first aspect Embodiment or a fifth possible implementation or a sixth possible implementation or a seventh possible implementation or an eighth possible implementation of the first aspect, in the ninth embodiment, the method Also includes:

Determining the length of time that the space reuse transmission is available.

With reference to the first aspect, the ninth possible implementation manner of the first aspect, in the tenth possible implementation manner, the determining the available duration of the space reuse transmission includes:

Obtaining, before the data frame, a request to send an RTS data frame and clearing the RSSI of each of the CTS data frames; if the RSSI of each of the RTS data frame and the CTS data frame is smaller than the OBSS packet detection threshold, Or, if the RSSI of the RTS data frame is greater than the OBSS packet detection threshold and the CTS data frame is not received, determining that the available duration of the spatial reuse transmission is the duration of the transmission opportunity TXOP level.

With reference to the first aspect, the ninth possible implementation manner of the first aspect, in the eleventh possible implementation manner, the determining the available duration of the space reuse transmission includes:

Obtaining the RSSI of each of the RTS data frame and the CTS data frame before the data frame, if the RSSI of the RTS data frame is greater than the OBSS packet detection threshold, and the CTS data frame is The RSSI is smaller than the OBSS packet detection threshold, and the duration of the spatial reuse transmission is determined as the duration of the physical layer protocol data unit PPDU level.

With reference to the first aspect, the ninth possible implementation manner of the first aspect, in the twelfth possible implementation, the determining the available duration of the space reuse transmission includes:

If the link type indicated by the data frame is a neighboring link and the receiving end of the transmission opportunity TXOP where the data frame is located remains unchanged, determining the duration of the spatial reuse transmission is the duration of the TXOP level.

With reference to the first aspect, the ninth possible implementation manner of the first aspect, or the tenth possible implementation manner or the twelfth possible implementation manner, in the thirteenth possible implementation manner, the TXOP level The start time of the duration is equal to the end time of the SIG-A in the data frame, and the end time of the duration of the TXOP level is equal to the end time of the TXOP where the data frame is located.

With reference to the first aspect, the eleventh possible implementation manner of the first aspect, in the fourteenth possible implementation, the start time of the duration of the PPDU level is equal to the SIG-A in the data frame. At the end time, the end time of the duration of the PPDU level is equal to the end time of the data frame.

In a second aspect, an embodiment of the present invention provides a STA, where the STA includes: a communication component, a processor, and a memory; the processor is configured to execute an instruction, and the communication component is configured to be controlled by the processor The processor implements the data transmission method provided by the above first aspect or any one of the possible implementation manners of the first aspect by executing an instruction.

In a third aspect, an embodiment of the present invention provides a computer readable storage medium, where the data transmission provided by implementing the foregoing first aspect or any one of the first aspects may be stored. The executable program of the method.

DRAWINGS

1 is a schematic diagram of an implementation environment involved in a data transmission method according to an embodiment of the present invention;

2 is a schematic structural diagram of a STA according to an embodiment of the present invention;

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

FIG. 3B is a structural diagram of an exemplary data frame according to an embodiment of the present invention; FIG.

4A is a flowchart of a data transmission method according to another embodiment of the present invention;

4B is a flowchart of a data transmission method according to another embodiment of the present invention;

4C is a schematic diagram of implementation of a data transmission method according to another embodiment of the present invention;

4D is a flowchart of a data transmission method according to another embodiment of the present invention;

4E is a schematic diagram of implementation of a data transmission method according to another embodiment of the present invention;

4F is a flowchart of a data transmission method according to another embodiment of the present invention;

4G is a schematic diagram of implementation of a data transmission method according to another embodiment of the present invention;

FIG. 5 is a flowchart of a data transmission method according to another embodiment of the present invention; FIG.

6 is a flowchart of a data transmission method according to another embodiment of the present invention;

FIG. 7 is a flowchart of a data transmission method according to another embodiment of the present invention; FIG.

FIG. 8A is a flowchart of a data transmission method according to another embodiment of the present invention; FIG.

FIG. 8B is a flowchart of a data transmission method according to another embodiment of the present invention; FIG.

FIG. 8C is a structural diagram of an exemplary data frame according to another embodiment of the present invention; FIG.

FIG. 8D is a flowchart of a data transmission method according to another embodiment of the present invention.

detailed description

A "module" as referred to herein refers to a program or instruction stored in a memory that is capable of implementing certain functions; "unit" as referred to herein refers to a functional structure that is logically divided, the "unit" may be Pure hardware implementation, or a combination of hardware and software.

In existing WiFi systems, Carrier Sense Multiple Access with Collosion Avoidance (CSMA/CA) is used to provide sharing of wireless channels in a competitive manner.

Transmit Opportunity (TXOP) is the time unit of wireless channel access, and TXOP is used to indicate the duration of STA or AP when data is transmitted. A STA obtains a TXOP after competing to seize the right to use the channel, and the STA that obtains the TXOP can continuously use the channel to transmit multiple data frames for the duration. In other words, a TXOP includes multiple data frames, and one data frame can be regarded as a Physical Protocal Data Unit (PPDU).

Carrier Sense (CS) in a WiFi system consists of two separate and distinct functions: Clear Channel Assessment (CCA) and Network Allocation Vector (NAV). The CCA is a physical CS mechanism that mainly detects the change of the channel state caused by other nodes. The NAV is a virtual CS mechanism, which mainly enables each STA except the STA being transmitted to maintain silence for a certain period of time.

CCA consists of two parts: CS and Energy Detection (ED). CS refers to the preamble that the receiver can listen to and decode the signal received from the channel; ED means that the receiver listens to the Received Signal Strength Indication (RSSI) on the channel based on multiple information, and the ED must Each time slot of the channel is sampled and the channel is judged to be in a busy state or an idle state according to RSSI, which is also referred to as CCA sensitivity. Specifically, a certain STA needs to receive a signal on the channel before transmitting data on a channel, when detecting A valid preamble is detected, and the CCA threshold indicating that the channel is in a busy state is -82 dBm, that is, when the RSSI is not less than -82 dBm, indicating that the channel is in a busy state; when a valid preamble is not detected, indicating that the channel is in a busy state The CCA threshold is -62 dBm.

There is also a problem of hidden nodes in the wireless network. Since the wireless signal has a certain transmission distance limitation, the STA cannot detect the signal beyond the distance. The premise of the channel competition mechanism is that the channel is detected to be in an idle state, and if the distance between the STAs is Exceeding the distance that the wireless signal can transmit, the STAs cannot detect each other's occupied channels (the two STAs are hidden nodes), thereby simultaneously transmitting data to the AP, and a physical signal conflict is formed when the AP receives the wireless signal. In order to solve the problem of the hidden node, the request to send/clear to send (RTS/CTS) mechanism may be adopted in the Media Access Control (MAC) layer. First, an RTS frame is sent to the receiving AP, and the receiving AP responds to the CTS frame, and all neighboring stations receive the CTS frame. When a STA receives an RTS/CTS frame, the STA extracts duration information from the heads of these frames and sets the NAV value based on the duration information. The protocol stipulates that other STAs that receive the RTS/CTS frame must consider that the channel is busy and cannot transmit data during the time required in the RTS/CTS frame, ie, during the NAV setup. After the transmitting STA receives the CTS frame sent by the receiving AP, it starts to transmit data. If the transmitting STA does not receive the CTS frame within a predetermined time, it needs to retransmit. In addition, since the RTS/CTS needs to occupy network resources and impose an additional burden, the RTS/CTS mechanism is usually started when the data to be transmitted reaches a certain size.

Please refer to FIG. 1 , which is a schematic diagram of an implementation environment of a data transmission method according to an embodiment of the present invention. The implementation environment includes: a wireless access point (AP) 120, a station (Station, STA) 140, an AP 160, and a STA 180.

An AP corresponds to a Basic Service Set (BSS). Optionally, the AP is a wireless router.

An STA is associated with a BSS. Optionally, the STA is a mobile terminal, such as a smart phone.

The area centered on STA 140 is BSS1, and STA 140 is associated with BSS1; the area centered on STA 180 is BSS2, and STA 180 is associated with BSS2.

The BSS1 corresponding to the AP 120 and the BSS 2 corresponding to the AP 160 constitute an Overlapping Basic Service Set (OBSS), that is, the area 110 in which the BSS1 and the BSS2 overlap is an OBSS.

The STA 140 is associated with the BSS1 corresponding to the AP 120, and is not associated with the BSS 2 corresponding to the AP 160. The STA 180 is associated with the BSS 2 corresponding to the AP 160 and is not associated with the BSS 1 corresponding to the AP 120.

The AP 120 and the AP 160 use the same frequency channel to transmit data.

Please refer to FIG. 2, which is a schematic structural diagram of a STA 140 according to an embodiment of the present invention. The STA 140 includes a communication component 220, a processor 230, and a memory 240.

The processor 230 is coupled to the communication component 220 and the memory 240.

The communication component 220 can be multiple for transmitting data with the wireless access node, and acquiring data frames of transmissions of other BSSs from the channel.

The communication component 220 is configured to acquire data frames transmitted by other BSSs from the channel; perform spatial reuse transmission on the channel.

Processor 230 includes one or more processing cores. The processor 230 runs the software and the module, thereby Performing various functional applications and data processing, such as determining whether to enable spatial reuse transmission based on information carried in the transmitted data frame; when determining to enable spatial reuse transmission, using a predetermined threshold in a competitive manner through communication component 220 Space reuse transmission on the channel.

The memory 240 is used to store software programs and modules. The memory 240 can store an operating system 241, an application module 242 required for at least one function. The application module 242 can include a determination module 221, a transmission module 222, and the like.

The determining module 221 is configured to determine, according to information carried in the data frame, whether to enable spatial reuse transmission;

The transmission module 222 is configured to perform spatial reuse transmission on the channel in a contention manner using a threshold when determining to enable spatial reuse transmission.

The duration determination module 223 is configured to determine the available duration of the spatial reuse transmission.

Moreover, memory 240 can be implemented by any type of volatile or non-volatile storage device, or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read only memory (EEPROM), erasable In addition to Programmable Read Only Memory (EPROM), Programmable Read Only Memory (PROM), Read Only Memory (ROM), Magnetic Memory, Flash Memory, Disk or Optical Disk.

Those skilled in the art will appreciate that the STA 140 structure illustrated in FIG. 2 does not form a limitation of STA 140 and may include more or fewer components or combinations of components, or different component arrangements.

It will also be understood by those skilled in the art that the STA 180 has the same or similar structure as the STA 140 shown in FIG. 2, and details are not described herein again.

Please refer to FIG. 3A, which shows a flowchart of a data transmission method according to an exemplary embodiment of the present invention. This embodiment is exemplified by the data transmission method applied to STAs in the implementation environment shown in FIG. 1. As shown in FIG. 3A, the data transmission method includes the following steps:

Step 301: Obtain a transmitted data frame of another BSS from the channel.

The STA is located in an OBSS including the present BSS associated with the STA and other BSSs other than the present BSS.

The BSS of the AP that has a communication relationship with the current STA is the current BSS associated with the current STA.

The data frames transmitted by other BSSs occupy the same channel as the channel occupied by the BSS transmission data frame.

Optionally, the transmitted data frame can be understood as an on-going data frame, that is, a data frame currently being transmitted between one STA and one AP in another BSS.

Step 302: Determine whether to enable Spatial Reuse (SR) transmission according to the information carried in the data frame.

The information carried in the transmitted data frame includes: the duration of the PPDU, the duration of the TXOP, the format field in the signaling (Signal-A, SIG-A), and the downlink (Dowlink, DL)/uplink in the SIG-A (Uplink, UL) domain, at least one of a Modulation and Coding Scheme (MCS) field in SIG-A, and a Length field in Legacy-Signal (L-SIG).

As shown in FIG. 3B, it exemplarily shows the structure of a data frame in which the Legacy Short Training Field (L-STF) field and the conventional mode are sequentially from left to right. Legacy Long Training Field (L-LTF) field, Legacy Signal Field (L-SIG) field, Repeated Legacy Signal (RL-SIG) field, High Efficiency Signaling (High) Efficiency Signal A, HE-SIG-A) fields and other preambles.

Optionally, the information carried in the transmitted data frame does not include: used to explicitly indicate whether space reuse transmission is enabled. Field.

Space reuse can be understood as the same channel. There are two sets of data that are different between the sender and the receiver. The interference generated by the two groups of data does not reach the extent that it can affect another group of data transmission. The degree of mutual interference of the group data does not affect the normal transmission and reception of each other's data.

Taking FIG. 1 as an example, it is assumed that the AP 160 and the STA 180 are performing data transmission on the channel 2 in FIG. 1 , and the data frame being transmitted by the AP 160 and the STA 180 is regarded as a transmitted data frame, that is, an on-going data frame. At this time, the AP 120 and the STA 140 are also When data transmission is performed on channel 2, it can be considered that STA 140 is performing spatial reuse transmission, and spatial reuse transmission between AP 120 and STA 140 does not affect the on-going data frame transmitted between AP 160 and STA 180.

Step 303, when it is determined that the space reuse transmission is enabled, the threshold is used to perform spatial reuse transmission on the channel in a competitive manner.

In summary, the data transmission method provided by the embodiment of the present invention determines whether the space reuse transmission is enabled according to the information carried in the data frame by acquiring the data frame transmitted by the other BSS from the channel, and determining the enabling space when determining the enabling space. When the transmission is reused, the threshold is used to perform spatial reuse transmission on the channel in a competitive manner; the problem that the STAs located in the OBSS area have less communication opportunities and the data throughput is not high is solved; and the information in the data packet without additional transmission is achieved. Only through the existing information can we judge whether the space can be reused, which not only saves the energy of the STA, but also improves the chance of space reuse.

It should be noted that the foregoing step 301 can be implemented by the processor of the STA through the communication component; the foregoing step 302 can be implemented by the processor of the STA executing the determining module in the memory of the STA; the above step 303 can be performed by the processor of the STA. The transfer module is implemented.

Please refer to FIG. 4A, which shows a flowchart of a data transmission method according to another exemplary embodiment of the present invention. This embodiment is exemplified by the data transmission method applied to STAs in the implementation environment shown in FIG. 1. As shown in FIG. 4A, the data transmission method includes the following steps:

Step 401: Obtain a transmitted data frame of another BSS from the channel.

At this time, the STA in the BSS does not perform data transmission, and the other BSSs that are not the BSS are performing data transmission.

Optionally, the information carried in the transmitted data frame includes the duration of the PPDU. The STA determines whether the SR transmission is enabled according to the duration of the PPDU carried in the transmitted data frame. The duration of the PPDU is obtained from the Legacy Length (L-Length) field in the L-SIG field.

Step 402: Detect whether the duration of the PPDU carried in the transmitted data frame is greater than a first threshold.

Optionally, the duration of the PPDU is obtained according to the L-Length field in the L-SIG field in the obtained data frame, and the PPDU duration is compared with the first threshold.

Step 403: If the duration of the PPDU is greater than the first threshold, determine to enable the SR transmission.

If the duration of the PPDU is less than the first threshold, it is determined that the SR transmission is not enabled.

When it is determined that the SR transmission is enabled, the available duration of the SR transmission can also be determined.

Step 404, determining the available duration of the SR transmission.

It should be noted that this step may be performed simultaneously with step 403 or after step 405, which is not limited in this embodiment.

There are two kinds of available durations for SR transmission: TXOP level duration and PPDU level duration. The TXOP duration is obtained from the TXOP field in the SIG-A field.

The start time of the duration of the TXOP level is equal to the end time of the SIG-A in the transmitted data frame, and the end time of the duration of the TXOP level is equal to the end time of the TXOP where the data frame is located.

Optionally, SIG-A is a field or combination of fields in the transmitted data frame. SIG-A can be regarded as the header of the transmitted data frame. According to the 802.11 standard, SIG-A supports all versions of the system.

Optionally, SIG-A can also be expressed as HE-SIGA (High Efficiency Signal-A, HE-SIGA).

The start time of the duration of the PPDU level is equal to the end time of the SIG-A in the transmitted data frame, and the end time of the duration of the PPDU level is equal to the end time of the transmitted data frame.

There are three implementations of this step, as follows:

There is a case where there is no Clear to send (CTS) data frame in the Request to send (RTS) data frame, or both the RTS data frame and the CTS data frame are present. The first implementation manner is shown in FIG. 4B. Shown as follows:

Step 4041: Acquire respective RSSIs of the RTS data frame and the CTS data frame before the data frame.

Step 4042: If the RSSI of each of the RTS data frame and the CTS data frame is smaller than the OBSS packet detection threshold, or if the RSSI of the RTS data frame is greater than the OBSS packet detection threshold and the CTS data frame is not received, determining that the available duration of the SR transmission is The duration of the transmission opportunity TOXP level.

Optionally, the OBSS packet detection threshold is less than the CCA threshold.

For example, in the link shown in FIG. 4C, assuming that the RSSI of each of the acquired RTS data frame and the CTS data frame is smaller than the OBSS packet detection threshold, the start time of the available duration of the SR transmission is the transmitted data frame 43. At the end time 41 of the SIG-A, the end time of the available duration of the SR transmission is the end time 42 of the TXOP where the transmitted data frame 43 is located, that is, the available duration of the spatial transmission is T1, and the value of T1 is the data frame 43 of the transmission. The end time 42 of the TXOP is subtracted from the end time 41 of the SIG-A of the transmitted data frame 43.

There is a case where there is no CTS data frame in the RTS data frame, or a case where both the RTS data frame and the CTS data frame exist, and the second implementation manner is as shown in FIG. 4D:

Step 4043: Acquire respective RSSIs of the RTS data frame and the CTS data frame before the data frame.

Step 4044: If the RSSI of the RTS data frame is greater than the OBSS packet detection threshold, and the RSSI of the CTS data frame is smaller than the OBSS packet detection threshold, determine the duration of the SR transmission as the duration of the PPDU level of the layer protocol data unit.

For example, in the link shown in FIG. 4E, assuming that the RSSI of the obtained RTS data frame is greater than the OBSS packet detection threshold, and the RSSI of the CTS data frame is smaller than the OBSS packet detection threshold, the start time of the available duration of the SR transmission is For the end time 45 of the SIG-A of the transmitted data frame 44, the end time of the available duration of the SR transmission is the end time 46 of the transmitted data frame 44, that is, the available duration of the spatial transmission is T2, and the value of T2 is the transmitted data. The end time 46 of the frame 44 is subtracted from the end time 45 of the SIG-A of the transmitted data frame 44.

In the case where neither the RTS data frame nor the CTS data frame exists, the third implementation manner is as shown in FIG. 4F:

Step 4045: If the link type indicated by the data frame is a neighboring link and the receiving end of the TXOP where the data frame is located remains unchanged, it is determined that the duration of the SR transmission is a duration of the TXOP level.

Optionally, the transmitted data frame has a field indicating a link type and a field indicating a receiving end of the TXOP where the data frame is located, and the STA may directly read the link type indicated by the data frame and the TXOP where the data frame is located from the foregoing two fields. The receiving end.

For example, in the link shown in FIG. 4G, the transmitted data frame indicates that the link type is a neighboring link and when the receiving end of the TXOP where the data frame is located remains unchanged, the start time of the available time of the SR transmission is For transmission of data frame 47 At the end time 48 of the SIG-A, the end time of the available duration of the SR transmission is the end time 49 of the TXOP where the transmitted data frame 47 is located, that is, the available duration of the spatial transmission is T3, and the value of T3 is the location of the transmitted data frame 47. The end time 49 of the TXOP is subtracted from the end time 48 of the SIG-A of the transmitted data frame 44.

Step 405, when it is determined that the SR transmission is enabled, the threshold is used to perform SR transmission on the channel in a contention manner.

It is detected whether the RSSI of the transmitted data frame is less than a threshold, and if the RSSI is less than the threshold, SR transmission is performed on the channel.

When it is determined that the SR transmission is not enabled, the method further includes:

CCA is performed using a CCA fixed threshold.

According to the 802.11 standard, the CCA fixed threshold is -82 mW decibels (-82 dBm) when a valid preamble is detected; the CCA fixed threshold is -62 mW decibels without detecting a valid preamble (- 62dBm).

In summary, in the data transmission method provided by the embodiment of the present invention, the STA obtains the data frame transmitted by the other BSS from the channel, and determines whether to enable the space reuse transmission according to the information carried in the data frame, when it is determined to be enabled. When space reuse is transmitted, the threshold is used to perform spatial reuse transmission on the channel in a competitive manner; the problem that the STAs located in the OBSS area have less communication opportunities and the data throughput is not high is solved; and the data packets in the transmission without additional transmission are achieved. Information, only through the existing information can be judged whether the space can be reused, which not only saves the energy of the STA, but also improves the chance of space reuse.

In addition, when it is determined that the space reuse transmission is enabled, the specific time length of the space reuse transmission is determined by the information carried in the data, and different durations are allocated for different situations, thereby effectively improving the channel utilization rate.

It should be noted that the foregoing step 401 can be implemented by the processor of the STA through the communication component; the above step 402 can be implemented by the processor of the STA executing the determining module in the memory of the STA; the above step 403 can be performed by the processor of the STA. The determining module is implemented by the above; the above step 404 can be implemented by the processor of the STA executing the duration determining module in the memory of the STA; the above step 405 can be implemented by the processor of the STA executing the transmission module in the memory of the STA.

In an optional embodiment based on the embodiment shown in FIG. 4A, the data frame of the transmission of the other BSS further includes the duration of the TXOP, and may further determine whether to enable the SR transmission according to the duration of the carried TXOP in the transmitted data frame. Step 402 to step 403 are replaced by steps 501 to 502, as shown in FIG. 5:

Whether the SR transmission is enabled is determined according to the duration of the TXOP carried in the data frame. The TXOP duration is obtained from the TXOP field in the SIG-A field.

Step 501: Detect whether the duration of the TXOP carried in the data frame is greater than a second threshold.

Step 502: If the duration of the TXOP is greater than the second threshold, determine to enable the SR transmission.

If the duration of the TXOP is not greater than the second threshold, it is determined that the SR transmission is not enabled.

It should be noted that the above step 501 can be implemented by the processor of the STA executing the determining module in the memory of the STA; the above step 502 can be implemented by the processor of the STA executing the determining module in the memory of the STA.

In an alternative embodiment based on the embodiment shown in FIG. 4A, the data frames transmitted by other BSSs further include a format field in SIG-A, a DL/UL field in SIG-A, and a Length field in L-SIG. It is also possible to determine whether to enable SR transmission according to the format field in the SIG-A carried in the data frame, the DL/UL field in the SIG-A, and the Length field in the L-SIG, when the data frame is an uplink single user. a frame, or an uplink multi-user frame, or a downlink single-user frame, or a downlink multi-user frame, Step 402 to step 403 are replaced by step 402a, or step 402b, as shown in FIG.

Whether to enable SR transmission is determined according to the format field in the carried SIG-A in the data frame, the DL/UL field in SIG-A, and the Length field in the L-SIG.

Optionally, the data frame is an uplink single user frame, or an uplink multi-user frame, or a downlink single-user frame, or a downlink multi-user frame.

In this embodiment, the data frame format can distinguish the 11ax packet type in the 802.11 protocol by using the L-Length field and the SIG-A2 phase in the L-SIG field, and when the Length to 3 is 2, the data packet The High Efficiency Multiple Users Physical Protocal Data Unit (HE-MU-PPDU) or the Extended Sigle User Physical Protocal Data Unit (EXT-SU-PPDU); When the length of the pair is 1, the single-user physical layer protocol data unit (SU-PPDU) or the Trigger-based Physical Protocal Data Unit (Trigger-based PPDU) ). The HE-MU-PPDU and the EXT-SU-PPDU are distinguished by the phase of the SIG-A2; the SU-PPDU and the Trigger-based PPDU are distinguished by a format field in the SIG-A field. Except that the Trigger-based PPDU defaults to the upstream data packet, the other types of data packets are distinguished from the uplink and downlink by the UL/DL field in the SIG-A field.

Optionally, only one field in the data frame indicates the direction of data transmission and the number of users. For example, one field indicates that the data frame is an uplink single-user frame.

Step 402a: If the data frame is an uplink single user frame or a downlink single user frame, it is determined that the SR transmission is enabled.

Since the data frame is an uplink single-user frame or a downlink single-user frame, and the transmitting end and the receiving end of the data frame are determined, the STA allows the SR transmission.

In step 402b, if the data frame is an uplink multi-user frame, it is determined that the SR transmission is enabled.

Since the data frame is an uplink multi-user frame and the receiving end of the data frame is an AP, the SR transmission can be determined by the collision level of the AP.

In addition, if the data frame is a downlink multi-user frame, it is determined that the SR transmission is not enabled.

Since the data frame is a downlink multi-user frame, it can be known that the receiving end of the data frame is a plurality of STAs. The process of determining whether there is no interference to other STAs is complicated, so the SR transmission is not enabled.

It should be noted that the foregoing step 402a may be implemented by the processor of the STA executing the determining module in the memory of the STA; the above step 402b may be implemented by the processor of the STA executing the determining module in the memory of the STA.

In an alternative embodiment based on the embodiment shown in FIG. 4A, the data frames transmitted by other BSSs also include the format field in SIG-A, the DL/UL field in SIG-A, and the Length in L-SIG. In the domain, when the data frame is a downlink multi-user frame, there is an exception to enable the SR, that is, the RTS data frame and the CTS data frame are received before receiving the transmitted data frame, and the foregoing step 402 to step 403 are performed by step 701 to Step 702 instead of implementation, as shown in Figure 7:

Step 701: If the data frame is a downlink multi-user frame, detect whether an RTS data frame and a CTS data frame exist in the data frame before the data frame.

Step 702, if there is an RTS data frame and a CTS data frame, it is determined that the SR transmission is enabled.

Since there are RTS data frames and CTS data frames, the interference of other STAs as receiving ends can be determined by the RSSI of the CTS, so the SR transmission is enabled.

If there is no RTS data frame and CTS data frame, it is determined that the SR transmission is not enabled.

It should be noted that the foregoing step 701 can be implemented by the processor of the STA executing the determining module in the memory of the STA; the above step 702 can be implemented by the processor of the STA executing the determining module in the memory of the STA.

In an optional embodiment based on the embodiment shown in FIG. 4A, the data frame of the transmission of the other BSS further includes a format field in SIG-A, a DL/UL field in SIG-A, and an MCS field in SIG-A. And the Length field in the L-SIG can also be based on the format field in the format in SIG-A in the transmitted data frame, the DL/UL field in SIG-A, the MCS field in SIG-A, and the L-SIG. In the Length field, determine whether the SR transmission is enabled. When the data frame is an uplink single-user frame or a downlink single-user frame, the above steps 402 to 403 are replaced by steps 801 to 802, as shown in FIG. 8A:

The SR transmission is determined according to the format field in the SIG-A carried in the data frame, the DL/UL field in the SIG-A, the MCS field in the SIG-A, and the Length field in the L-SIG.

In this embodiment, the data frame format can distinguish the 11ax packet type in the 802.11 protocol by using the L-Length field and the SIG-A2 phase in the L-SIG field, and when the Length to 3 is 2, the data packet It is an HE-MU-PPDU or a EXT-SU-PPDU; when the balance of the Length 3 is 1, it is an SU-PPDU or a Trigger-based PPDU. The HE-MU-PPDU and the EXT-SU-PPDU are distinguished by the phase of the SIG-A2; the SU-PPDU and the Trigger-based PPDU are distinguished by the Format field in the SIG-A. Except that the Trigger-based PPDU defaults to the upstream data packet, the other types of data packets are distinguished by the UL/DL domain in the SIG-A.

Step 801: If it is detected that the data frame is an uplink single user frame or a downlink single user frame, it is detected whether the MCS level is greater than the first level.

Optionally, the first level is a predetermined MCS level.

Step 802: If the MCS level is greater than the first level, determine to enable SR transmission.

It should be noted that the foregoing step 801 can be implemented by the processor of the STA executing the determining module in the memory of the STA; the above step 802 can be implemented by the processor of the STA executing the determining module in the memory of the STA.

In an optional embodiment based on the embodiment shown in FIG. 4A, the data frames transmitted by other BSSs further include a format field in SIG-A, a downlink DL/uplink UL field in SIG-A, and SIG-A. The MCS domain and the Length field in the L-SIG determine whether the SR transmission is enabled. When the data frame is a downlink single-user frame, the above steps 402 to 403 are replaced by the steps 803 to 804, as shown in FIG. 8B.

Step 803: If the data frame is a downlink multi-user frame, it is detected whether the MCS level of the SIG-B indicated by the SIG-A in the data frame is greater than the second level.

Optionally, the second level is a predetermined MCS level.

Optionally, SIG-B is a field or combination of fields in a data frame. According to the 802.11 standard, SIG-A supports all versions of the system, and SIG-B only supports higher versions of the system.

Optionally, SIG-A, SIG-B, and data to be transmitted are included in some data frames. Generally, the SIG-A field is at the forefront of the data frame, and the SIG-B field is behind the SIG-A field. The information about SIG-B can be obtained by parsing the information in the SIG-A field.

As shown in FIG. 8C, it schematically shows a structure diagram of a data frame including SIG-B in which other preambles and other modes of short training are sequentially performed from left to right. (Legacy Short Training Field, L-STF) field/Range Legacy Signal (RL-SIG) field, High Efficiency Signal A1 (HE-SIG-A1) field, High Efficiency Signal A2 (HE-SIG) -A2) field, High Efficiency Signal B (HE-SIG-B) field and Other Preamble.

Step 804, if the MCS level is greater than the second level, it is determined that the SR transmission is enabled.

It should be noted that the foregoing step 803 can be implemented by the processor of the STA executing the determining module in the memory of the STA; the above step 804 can be implemented by the processor of the STA executing the determining module in the memory of the STA.

In an optional embodiment based on the embodiment shown in FIG. 4A, the data frame of the transmission of the other BSS further includes a format field in SIG-A, a DL/UL field in SIG-A, and an MCS field in SIG-A. And determining whether to enable SR transmission in the Lengt field in the L-SIG. When the data frame is an uplink multi-user frame, the above steps 402 to 403 are replaced by steps 805 to 806, as shown in FIG. 8D:

Step 805: If the data frame is an uplink multi-user frame, whether the MCS level of each STA in the trigger frame before detecting the data frame is greater than the third level.

Optionally, the third level is a predetermined MCS level.

Optionally, the trigger frame is represented as a Trigger Frame frame.

Step 806, if the MCS levels of each STA are greater than the third level, it is determined that the SR transmission is enabled.

It should be noted that the above step 805 can be implemented by the processor of the STA executing the determining module in the memory of the STA; the above step 806 can be implemented by the processor of the STA executing the determining module in the memory of the STA.

In an alternative embodiment based on the embodiment shown in FIG. 4A or FIG. 6 or FIG. 7 or FIG. 8A or FIG. 8B or FIG. 8C, when determining that the SR transmission is not enabled, the data transmission method may also set the NAV, NAV can be regarded as a timer. During the NAV setting period, the CCA is not performed during the NAV duration. The specific steps for setting the NAV are as follows:

1. When it is determined that the SR transmission is not enabled, the NAV is set, and the value of the NAV is equal to the difference between the end time of the TXOP where the transmitted data frame is located and the end time of the signaling A in the transmitted data frame.

When it is determined that the SR transmission of the PPDU level is not enabled, the NAV is set, and the value of the NAV is equal to the difference between the end time of the TXOP where the transmitted data frame is located and the end time of the SIG-A in the transmitted data frame. .

2. If the transmitted data frame of the other BSS is received again, the NAV is corrected to be equal to 0.

It should be noted that when it is determined that the SR that is available for the PPDU level is not enabled, the NAV may not be set to provide an opportunity for the SR to be transmitted for subsequent data frames.

It should be noted that the foregoing step 1 may be implemented by a processor of the STA; the foregoing step 2 may be implemented by a processor of the STA.

In an alternative embodiment based on the embodiment shown in FIG. 5, when it is determined that the SR transmission is not enabled, the NAV can also be set in the data transmission method, and the NAV can be regarded as a timer, which is also during the NAV setting. The CCA is not performed within the NAV duration. The specific steps for setting the NAV are as follows:

When it is determined that the SR level transmission is not enabled, the NAV is set, and the value of NAV is equal to the difference between the end time of the TXOP where the data frame is located and the end time of SIG-A in the data frame.

Specifically, when it is determined that the SR transmission of the TXOP level is not enabled, the NAV is set, and the value of the NAV is equal to the end time of the TXOP where the transmitted data frame is located and the end time of the signaling A in the transmitted data frame. The difference.

It should be noted that the foregoing steps may be implemented by a STA's processor.

It should be noted that other implementation manners of the data transmission method may be combined according to the foregoing embodiments, and details are not described herein again.

It should be noted that, when the data transmission device provided by the foregoing embodiment uses the spatial reuse transmission, only the division of each functional module is used for illustration. In an actual application, the function distribution may be completed by different functional modules as needed. The internal structure of the device is divided into different functional modules to complete all or part of the functions described above. In addition, the data transmission apparatus and the data transmission method embodiment provided by the foregoing embodiments are in the same concept, and the specific implementation process is described in detail in the method embodiment, and details are not described herein again.

The serial numbers of the embodiments of the present invention are merely for the description, and do not represent the advantages and disadvantages of the embodiments.

A person skilled in the art may understand that all or part of the steps of implementing the above embodiments may be completed by hardware, or may be instructed by a program to execute related hardware, and the program may be stored in a computer readable storage medium. The storage medium mentioned may be a read only memory, a magnetic disk or an optical disk or the like.

The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalents, improvements, etc., which are within the spirit and scope of the present invention, should be included in the protection of the present invention. Within the scope.

Claims

A data transmission method, characterized in that the method comprises:

Obtaining data frames transmitted by other BSSs from the channel;

Determining whether space reuse transmission is enabled according to information carried in the data frame;

When it is determined that the spatial reuse transmission is enabled, a threshold reuse is used to perform spatial reuse transmissions on the channel in a contentive manner.
The method according to claim 1, wherein the information carried in the data frame comprises: a duration of a physical layer protocol data unit PPDU;

Determining whether to enable spatial reuse of the SR transmission according to the information carried in the data frame, including:

Detecting whether the duration of the PPDU carried in the data frame is greater than a first threshold;

If the duration of the PPDU is greater than the first threshold, determining to enable the spatial reuse transmission.
The method according to claim 1, wherein the information carried in the data frame comprises: a duration of a transmission opportunity TXOP;

Determining whether to enable spatial reuse transmission according to the information carried in the data frame, including:

Detecting whether the duration of the TXOP carried in the data frame is greater than a second threshold;

If the duration of the TXOP is greater than the second threshold, then determining to enable the spatial reuse transmission.
The method according to claim 1, wherein the information carried in the data frame comprises: a format field in the signaling SIG-A, a downlink DL/uplink UL field in the SIG-A, and legacy signaling. Length field in L-SIG;

Determining whether to enable spatial reuse transmission according to the information carried in the data frame, including:

If the data frame is an uplink single user frame or a downlink single user frame, determining to enable the space reuse transmission;

or,

If the data frame is an uplink multi-user frame, it is determined that the space reuse transmission is enabled.
The method according to claim 1, wherein the information carried in the data frame comprises: a format field in the signaling SIG-A, a downlink/uplink DL/UL field in the SIG-A, and a legacy message. Let the length of the L-SIG be in the Length field;

Determining whether to enable spatial reuse transmission according to the information carried in the data frame, including:

If the data frame is a downlink multi-user frame, detecting whether there is a request to send an RTS data frame and clearing a CTS data frame in a data frame before the data frame;

If the RTS data frame and the CTS data frame are present, it is determined that the spatial reuse transmission is enabled.
The method according to claim 1, wherein the information carried in the data frame comprises: a format field in the signaling SIG-A, a downlink DL/uplink UL field in the SIG-A, the SIG - Length modulation field in the modulation coding scheme MCS domain in -A and the legacy signaling L-SIG;

Determining whether to enable spatial reuse transmission according to the information carried in the data frame, including:

If the data frame is an uplink single user frame or a downlink single user frame, detecting whether the level of the MCS is greater than the first level Level; if the level of the MCS is greater than the first level, determining to enable the space reuse transmission.
The method according to claim 1, wherein the information carried in the data frame comprises: a format field in the signaling SIG-A, a downlink DL/uplink UL field in the SIG-A, the SIG - Length modulation field in the modulation coding scheme MCS domain in -A and the legacy signaling L-SIG;

Determining whether to enable spatial reuse transmission according to the information carried in the data frame, including:

If the data frame is a downlink multi-user frame, detecting whether the MCS level is greater than a second level; if the MCS level is greater than the second level, determining to enable the space reuse transmission.
The method according to claim 1, wherein the information carried in the data frame comprises: a format field in the signaling SIG-A, a downlink DL/uplink UL field in the SIG-A, the SIG - Length modulation field in the modulation coding scheme MCS domain in -A and the legacy signaling L-SIG;

Determining whether to enable spatial reuse transmission according to the information carried in the data frame, including:

If the data frame is an uplink multi-user frame, the MCS level of each STA in the trigger frame before the data frame is detected to be greater than the third level; if the MCS level of each STA is greater than the third level, Determining that the space reuse transmission is enabled.
The method of claim 1 further comprising:

Determining the length of time that the space reuse transmission is available.
The method according to claim 9, wherein the determining the available duration of the spatial reuse transmission comprises:

Obtaining, before the data frame, a request to send an RTS data frame and clearing the RSSI of each of the CTS data frames; if the RSSI of each of the RTS data frame and the CTS data frame is smaller than the OBSS packet detection threshold, Or, if the RSSI of the RTS data frame is greater than the OBSS packet detection threshold and the CTS data frame is not received, determining that the available duration of the spatial reuse transmission is the duration of the transmission opportunity TXOP level.
The method according to claim 9, wherein the determining the available duration of the spatial reuse transmission comprises:

Obtaining the RSSI of each of the RTS data frame and the CTS data frame before the data frame, if the RSSI of the RTS data frame is greater than the OBSS packet detection threshold, and the CTS data frame is The RSSI is smaller than the OBSS packet detection threshold, and the duration of the spatial reuse transmission is determined as the duration of the physical layer protocol data unit PPDU level.
The method according to claim 9, wherein the determining the available duration of the spatial reuse transmission comprises:

If the link type indicated by the data frame is a neighboring link and the receiving end of the transmission opportunity TXOP where the data frame is located remains unchanged, determining the duration of the spatial reuse transmission is the duration of the TXOP level.
Method according to any of claims 10-12, characterized in that the start of the duration of the TXOP level The timing is equal to the end time of the SIG-A in the data frame, and the end time of the duration of the TXOP level is equal to the end time of the TXOP where the data frame is located.
The method according to any one of claims 10-12, wherein a start time of a duration of the PPDU level is equal to an end time of SIG-A in the data frame, and an end time of a duration of the PPDU level Equal to the end time of the data frame.
A station STA, characterized in that the STA comprises: a communication component, a processor and a memory;

The communication component is configured to acquire data frames of transmissions of other BSSs from a channel;

The processor, configured to determine, according to information carried in the data frame, whether to enable spatial reuse transmission; when determining that the spatial reuse transmission is enabled, using a threshold to compete in a manner through the communication component Space reuse transmission on the channel.
The STA according to claim 15, wherein the information carried in the data frame comprises: a duration of a physical layer protocol data unit PPDU;

The processor is configured to determine, according to information carried in the data frame, whether to enable spatial reuse transmission, including:

The processor is configured to detect whether the duration of the PPDU carried in the data frame is greater than a first threshold; if the duration of the PPDU is greater than the first threshold, determining to enable the spatial reuse transmission.
The STA according to claim 15, wherein the information carried in the data frame comprises: a duration of the transmission opportunity TXOP;

The processor is configured to determine, according to information carried in the data frame, whether to enable space reuse transmission, including:

The processor is configured to detect whether a duration of the TXOP carried in the data frame is greater than a second threshold; if the duration of the TXOP is greater than the second threshold, determining to enable the spatial reuse transmission.
The STA according to claim 15, wherein the information carried in the data frame comprises: a format field in the signaling SIG-A, a downlink DL/uplink UL field in the SIG-A, and legacy signaling. Length field in L-SIG;

The processor is configured to determine, according to information carried in the data frame, whether to enable space reuse transmission, including:

The processor is configured to: if the data frame is an uplink single-user frame or a downlink single-user frame, determine to enable the spatial reuse transmission; or, if the data frame is an uplink multi-user frame, determine to enable The space reuse transmission.
The STA according to claim 15, wherein the information carried in the data frame comprises: a format field in the signaling SIG-A, a downlink DL/uplink UL field in the SIG-A, and legacy signaling. Length field in L-SIG;

The processor is configured to determine, according to information carried in the data frame, whether to enable space reuse transmission, including:

The processor is configured to: if the data frame is a downlink multi-user frame, detect whether there is a request to send an RTS data frame and clear a send CTS data frame in a data frame before the data frame; if the RTS data frame exists And the CTS data frame, determining to enable the spatial reuse transmission.
The STA according to claim 15, wherein the information carried in the data frame comprises: a format field in the signaling SIG-A, a downlink DL/uplink UL field in the SIG-A, the SIG - Length modulation field in the modulation coding scheme MCS domain in -A and the legacy signaling L-SIG;

The processor is configured to determine, according to information carried in the data frame, whether to enable space reuse transmission, including:

The processor is configured to: if the data frame is an uplink single user frame or a downlink single user frame, detect whether the MCS level is greater than a first level; if the MCS level is greater than the first level, determine to enable The space can be reused for transmission.
The STA according to claim 15, wherein the information carried in the data frame comprises: a format field in the signaling SIG-A, a downlink DL/uplink UL field in the SIG-A, the SIG - Length modulation field in the modulation coding scheme MCS domain in -A and the legacy signaling L-SIG;

The processor is configured to determine, according to information carried in the data frame, whether to enable space reuse transmission, including:

The processor is configured to: if the data frame is a downlink multi-user frame, detect whether the MCS level is greater than a second level; if the MCS level is greater than the second level, determine to enable the space reuse transmission.
The STA according to claim 15, wherein the information carried in the data frame comprises: a format field in the signaling SIG-A, a downlink DL/uplink UL field in the SIG-A, the SIG - Length modulation field in the modulation coding scheme MCS domain in -A and the legacy signaling L-SIG;

The processor is configured to determine, according to information carried in the data frame, whether to enable space reuse transmission, including:

The processor is configured to: if the data frame is an uplink multi-user frame, detect whether the MCS levels of the STAs in the trigger frame before the data frame are greater than the third level; if the MCS levels of each STA are greater than The third level determines that the spatial reuse transmission is enabled.
The STA according to claim 15, wherein the processor is further configured to:

Determining the length of time that the space reuse transmission is available.
The STA of claim 23, wherein the processor is configured to determine an available duration of the spatial reuse transmission, comprising:

The processor is configured to acquire, before the data frame, a request to send an RTS data frame and clear the RSSI of each of the CTS data frames; if the RSSI of each of the RTS data frame and the CTS data frame is smaller than The OBSS packet detection threshold, or if the RSSI of the RTS data frame is greater than the OBSS packet detection threshold and the CTS data frame is not received, determining that the available duration of the spatial reuse transmission is a transmission opportunity TXOP level duration.
The STA of claim 23, wherein the processor is configured to determine an available duration of the spatial reuse transmission, comprising:

The processor is configured to acquire the RSSI of each of the RTS data frame and the CTS data frame before the data frame, if the RSSI of the RTS data frame is greater than the OBSS packet detection threshold, and The RSSI of the CTS data frame is smaller than the OBSS packet detection threshold, and the duration of the spatial reuse transmission is determined as the duration of the physical layer protocol data unit PPDU level.
The STA of claim 23, wherein the processor is configured to determine an available duration of the spatial reuse transmission, comprising:

The processor is configured to determine that the duration of the space reuse transmission is determined if the link type indicated by the data frame is a neighboring link and the receiving end of the transmission opportunity TXOP where the transmitted data frame is located remains unchanged. The duration of the TXOP level.
The STA according to any one of claims 24 to 26, wherein a start time of a duration of the TXOP level is equal to an end time of SIG-A in the data frame, and an end time of a duration of the TXOP level Equal to the end time of the TXOP where the data frame is located.
The STA according to any one of claims 24 to 26, wherein a start time of a duration of the PPDU level is equal to an end time of SIG-A in the data frame, and an end time of a duration of the PPDU level Equal to the end time of the data frame.