WO2018121177A1

WO2018121177A1 - Spatial reuse method and device

Info

Publication number: WO2018121177A1
Application number: PCT/CN2017/114213
Authority: WO
Inventors: 李瑞梅; 吕开颖
Original assignee: 中兴通讯股份有限公司
Priority date: 2016-12-30
Filing date: 2017-12-01
Publication date: 2018-07-05

Abstract

The disclosure provides a spatial reuse method and device. The method comprises: receiving a radio frame, and determining, according to trigger frame indication information in a physical signaling field of the radio frame, whether the radio frame carries a trigger frame for triggering multi-user uplink transmission; if so, receiving, by a station, the trigger frame, and acquiring first spatial reuse information of the trigger frame; and upon completion of the radio frame transmission, determining, according to the first spatial reuse information, whether to perform a first spatial reuse process. The disclosure discloses the embodiment to resolve an issue of low spatial reuse efficiency when spatial reuse is applied to a radio frame in the related art, achieving enhancement of network performance.

Description

Method and device for spatial multiplexing

Technical field

The present disclosure relates to the field of communications, and illustratively, to a method and apparatus for spatial multiplexing.

Background technique

In an infrastructure network of a wireless local area network (WLAN), an access point station (AP) and a plurality of non-access point stations (non-APs) associated with the AP Station, referred to as non-AP STA, constitutes a basic service set (BSS). The WLAN generally uses carrier detection technology to determine whether the channel is occupied. There are two types of carrier detection technologies, namely physical carrier detection and virtual carrier detection. Physical carrier detection means that the radio channel is monitored to determine whether the received energy exceeds a certain threshold. If the threshold is exceeded, the channel is considered to be occupied. The virtual carrier detection means that the receiver transmits the radio frame and carries the subsequent transmission in the radio frame. The reserved channel time is required. The other stations maintain one or more timers locally according to the received reservation time, such as a network allocation vector (NAV). If the NAV of the station is not 0, the station does not contend for the channel.

In the related art, Spatial Reuse (SR) technology has become a hot spot because it can improve performance in dense scenes. The core of the SR is that the site is also transmitted while the Overlapping Basic Service Set (OBSS) is transmitted, thereby improving spectrum efficiency and improving network performance. In order to reduce the interference caused by simultaneous transmission, SR is combined with the power adjustment technology TPC. There are two types of SR technology, one is based on the received signal strength of the radio frame, and the other is based on the degree of interference received by the receiver in the received radio frame exchange.

When it is judged that the received signal strength of the currently received radio frame cannot be multiplexed, since the NAV has been set, the subsequent multiplexing judgment based on the interference of the receiver cannot be performed. How to jointly use two kinds of multiplexing judgment methods for multiplexing transmission is an urgent problem to be solved.

Summary of the invention

The embodiments of the present disclosure provide a method and apparatus for spatial multiplexing to solve at least the problem of low efficiency when a station performs spatial multiplexing on a radio frame in the related art.

According to an embodiment of the present disclosure, a method for spatial multiplexing is provided, which is applied to a site of a wireless local area network, including: receiving a radio frame, and determining, according to trigger frame indication information in a physical signaling domain of the radio frame Whether the wireless frame carries a trigger frame that is set to trigger the uplink multi-user transmission; when it is determined that the wireless frame carries the trigger frame, the station receives the trigger frame, and obtains the first spatial multiplexing information of the trigger frame. Determining whether to perform the first spatial multiplexing according to the first spatial multiplexing information at the end of the radio frame.

Optionally, the method further includes: obtaining the trigger frame indication information according to the second spatial multiplexing information in the radio frame physical signaling domain.

Optionally, the method further includes: when the second spatial multiplexing information indicates that the spatial multiplexing delay is to the end of the radio frame, determining that the detection result is that the radio frame carries the trigger frame; or And determining, when the second spatial multiplexing information indicates that the spatial multiplexing time is limited before the end of the radio frame, the detection result that the radio frame carries the trigger frame.

Optionally, before obtaining the first spatial multiplexing information, the method further includes: identifying, according to the basic service set identification information of the radio frame, the radio frame that belongs to the overlapping basic service set.

Optionally, before the obtaining the first spatial multiplexing information, the method further includes: when the received signal strength of the radio frame is greater than or equal to a signal detection threshold of the overlapping basic service set of the station, The station receives the trigger frame to obtain the first spatial multiplexing information.

Optionally, performing the first spatial multiplexing according to the first spatial multiplexing information at the end of the radio frame comprises: starting or restoring a back-off competition process at the end of the radio frame.

Optionally, the method further includes: when the backoff competition process ends, starting a frame exchange sending process, where the duration of the frame exchange sending process does not exceed a reservation time of the radio frame or the trigger frame indication The length of the uplink radio frame transmission time.

Optionally, the method further includes: when the backoff competition process ends, starting a frame exchange sending process, where the transmit power TX_PWR of the station in the frame exchange sending process is not greater than TX_PWR1, where the TX_PWR1 The difference between the received signal strength RSSI of the radio frame is subtracted from the value SRP indicated by the first spatial multiplexing information.

Optionally, when it is determined that the radio frame does not carry a trigger frame, or the first spatial multiplexing information indicates that multiplexing is not allowed, the method further includes: when the second spatial multiplexing condition is not met, At the end of the radio frame, the local network allocation vector or the uplink radio frame transmission time length indicated by the trigger frame is updated according to the reservation time of the radio frame.

Optionally, when the received signal strength of the radio frame is greater than or equal to a signal detection threshold of the overlapping basic service set of the station, determining that the second spatial multiplexing condition is not satisfied.

Optionally, the method further includes: determining, according to the first spatial multiplexing information, whether the first spatial multiplexing condition is met, and ignoring the update of the local network allocation vector if both the first multiplexing condition and the second spatial multiplexing condition are met If the first spatial multiplexing condition is satisfied, the second spatial multiplexing condition is not satisfied, and the update of the local network allocation vector is ignored; if the first multiplexing condition and the second spatial multiplexing condition are not satisfied, the local network allocation vector is updated.

Optionally, when the second spatial multiplexing information indicates that the spatial multiplexing delay is to the end of the radio frame, the method further includes: if the received signal strength of the radio frame is smaller than the overlapping of the station When the signal detection threshold of the basic service set is determined, the second spatial multiplexing condition is determined to be satisfied, and the trigger frame is accepted to obtain the first spatial multiplexing information.

Optionally, performing spatial multiplexing according to the first spatial multiplexing information at the end of the radio frame comprises: starting or restoring a back-off competition process at the end of the radio frame; at the end of the back-off competition process, starting a frame exchange transmission process; wherein, the duration of the frame exchange transmission process does not exceed a reservation time of the radio frame; and the transmit power TX_PWR of the frame exchange transmission process is not greater than a minimum value of TX_PWR1 and TX_PWR2. Where the TX_PWR1 And subtracting, from the value SRP indicated by the first spatial multiplexing information, a difference of the received signal strength RSSI of the radio frame, where the TX_PWR2 is a maximum transmission corresponding to the overlapping basic service set signal detection threshold of the station power.

Optionally, when the second spatial multiplexing information indicates that the spatial multiplexing time is limited to the end of the radio frame, the method further includes: if the received signal strength of the radio frame is less than the location of the station When the signal detection threshold of the basic service set is overlapped, it is determined that the second spatial multiplexing condition is satisfied.

Optionally, the method further includes: stopping detecting the radio frame, and stopping receiving the trigger frame carried by the radio frame; starting or restoring the backoff competition process, and starting the frame exchange sending when the backoff competition process ends The process; wherein the duration of the frame exchange transmission process does not exceed the end time of the radio frame, and the transmit power TX_PWR of the station in the frame exchange transmission process is not greater than TX_PWR2. The TX_PWR2 is a maximum transmit power corresponding to the overlapping basic service set signal detection threshold of the station.

Optionally, the station starts or resumes the backoff competition process, and the method further includes: starting or restoring the backoff competition process when the channel detection of the station indicates that the channel is idle.

According to an embodiment of the present disclosure, there is provided another method of spatial multiplexing, applied to a site of a wireless local area network, comprising: transmitting a radio frame, wherein physical layer signaling of the radio frame includes setting to indicate the Whether the wireless frame is the indication information of the trigger frame.

Optionally, the trigger frame is set to trigger an uplink transmission.

Optionally, the transmitting the radio frame comprises at least one of: transmitting the radio frame in a single user frame format, transmitting the radio frame in an extended range single user frame format, and transmitting the radio frame in a multi-user format.

Optionally, the indication information is carried in a common signaling domain in the physical layer signaling of the radio frame.

Optionally, the indication information is represented by a specific value of a spatial multiplexing parameter information field in a common signaling domain in the physical layer signaling of the radio frame, where the specific value indicates a spatial complex The specific value simultaneously indicates that the radio frame is a trigger frame when the radio frame end or the spatial multiplexing time is limited to the end of the radio frame.

Optionally, the indication information is carried in a trigger frame indication field in a common signaling domain in the physical layer signaling of the radio frame.

Optionally, the value of the trigger frame indication field is 1 or true, and the radio frame carries a trigger frame. The value of the trigger frame indication field is 0 or false, and the radio frame does not carry the trigger frame.

Optionally, the trigger frame indicates that the domain occupies N bits, where N>=1.

According to another embodiment of the present disclosure, there is provided a spatial multiplexing apparatus, applied to a site of a wireless local area network, comprising: a detecting module configured to receive a radio frame, according to a trigger in a physical signaling domain of the radio frame The frame indication information determines whether the radio frame carries a trigger frame that is set to trigger uplink multi-user transmission; and the processing module is configured to: when determining that the radio frame carries the trigger frame, the station receives the trigger frame, and obtains a first spatial multiplexing information of the trigger frame; and a multiplexing module configured to determine, according to the first spatial multiplexing information, whether to perform the first spatial multiplexing when the wireless frame ends.

Optionally, the apparatus further includes: an obtaining module, configured to obtain the trigger frame indication information according to the second spatial multiplexing information in the radio frame physical signaling domain.

Optionally, the apparatus further includes: a first determining module, configured to determine that the detection result is the radio frame when the second spatial multiplexing information indicates that the spatial multiplexing delay is to the end of the radio frame Carrying the trigger frame; the second determining module is configured to: when the second spatial multiplexing information indicates that the spatial multiplexing time limit is before the end of the radio frame, determine that the detection result is the radio frame carrying station The trigger frame.

Optionally, the multiplexing module further includes: a first multiplexing unit configured to start or resume the backoff competition process at the end of the radio frame.

According to another embodiment of the present disclosure, another spatial multiplexing apparatus is provided, which is applied to a site of a wireless local area network, and includes: a sending module, configured to send a trigger frame of a wireless frame; wherein, wherein the wireless frame is The physical layer signaling includes indication information set to indicate whether the radio frame is a trigger frame.

The radio frame is received, and the triggering frame indication information in the physical signaling domain of the radio frame is used to determine whether the radio frame carries a trigger frame set to trigger uplink multi-user transmission; when determining the radio frame carrying When the frame is triggered, the station receives the trigger frame, and obtains first spatial multiplexing information of the trigger frame; and determines, according to the first spatial multiplexing information, whether to perform the first space, when the wireless frame ends In the multiplexing, since the subsequent radio frames are spatially multiplexed by using the trigger frame, the problem that the site is less efficient in spatial multiplexing of the radio frames in the related art can be solved, and the technical effect of improving the network performance is achieved.

DRAWINGS

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

1 is a block diagram showing the hardware structure of a station of a spatial multiplexing method according to an embodiment of the present disclosure;

2 is a flowchart of a method of spatial multiplexing in accordance with an embodiment of the present disclosure;

3 is a structural block diagram of an apparatus for spatial multiplexing according to an embodiment of the present disclosure;

4 is a schematic diagram of a spatial multiplexing method for a site receiving an OBSS PPDU in an HE SU format according to an embodiment of the present disclosure;

5 is a schematic diagram of a spatial multiplexing method for receiving an OBSS PPDU in a HE extended range SU format by a station according to an embodiment of the present disclosure;

FIG. 6 is a schematic diagram of a spatial multiplexing method for a site receiving an OBSS PPDU in a HE MU format according to an embodiment of the present disclosure.

detailed description

The present disclosure will be described in detail below with reference to the drawings in conjunction with the embodiments. 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 is to be understood that the terms "first", "second", and the like in the specification and claims of the present disclosure are used to distinguish similar objects, and are not necessarily used to describe a particular order or order.

Example 1

The method embodiment provided in Embodiment 1 of the present application can be executed in a station, a computer terminal, or the like. Taking an access point site running in a wireless local area network as an example, FIG. 1 is a spatial complex of an embodiment of the present disclosure. A block diagram of the hardware structure of the site used. As shown in FIG. 1, site 10 may include one or more (only one shown) processor 102 (processor 102 may include, but is not limited to, a processing device such as a microprocessor MCU or a programmable logic device FPGA), A memory 104 for storing data, and a transmission device 106 for communication functions. It will be understood by those skilled in the art that the structure shown in FIG. 1 is merely illustrative and does not limit the structure of the above electronic device. For example, site 10 may also include more or fewer components than those shown in FIG. 1, or have a different configuration than that shown in FIG.

The memory 104 can be used to store software programs and modules of application software, such as program instructions/modules corresponding to spatial multiplexing methods in the embodiments of the present disclosure, and the processor 102 executes by executing software programs and modules stored in the memory 104. Various functional applications and data processing, that is, the above methods are implemented. Memory 104 may include high speed random access memory, and may also include non-volatile memory such as one or more magnetic storage devices, flash memory, or other non-volatile solid state memory. In some examples, memory 104 may include memory remotely located relative to processor 102, which may be connected to site 10 over a network. Examples of such networks include, but are not limited to, the Internet, intranets, local area networks, mobile communication networks, and combinations thereof.

Transmission device 106 is arranged to receive or transmit data via a network. An exemplary embodiment of the network described above may include a wireless network provided by a communication provider of the site 10. In one example, the transmission device 106 includes a Network Interface Controller (NIC) that can be connected to other network devices through a base station to communicate with the Internet. In one example, the transmission device 106 can be a Radio Frequency (RF) module configured to communicate with the Internet wirelessly.

In this embodiment, a method for spatial multiplexing running at the foregoing site is provided. FIG. 2 is a flowchart of a method for spatial multiplexing according to an embodiment of the present disclosure. As shown in FIG. 2, the process includes the following steps:

Step S202: Receive a radio frame, and determine, according to the trigger frame indication information in the physical signaling domain of the radio frame, whether the radio frame carries a trigger frame that is set to trigger uplink multi-user transmission.

Step S204, when it is determined that the radio frame carries the trigger frame, the station receives the trigger frame, and obtains the first spatial multiplexing information of the trigger frame.

Step S206, determining whether to perform the first spatial multiplexing according to the first spatial multiplexing information at the end of the radio frame.

Through the foregoing steps, the radio frame is received, and the triggering frame indication information in the physical signaling domain of the radio frame is used to determine whether the radio frame carries a trigger frame that is set to trigger uplink multi-user transmission; when it is determined that the radio frame carries the trigger frame, the station receives the trigger. And obtaining a first spatial multiplexing information of the triggering frame; determining, according to the first spatial multiplexing information, whether to perform the first spatial multiplexing, and determining, by using the triggering frame, spatial multiplexing of the subsequent wireless frame, Therefore, the problem that the site is less efficient in spatial multiplexing of the radio frame in the related art can be solved, and the technical effect of improving the network performance is achieved.

Optionally, the execution body of the foregoing steps may be a site or the like in the WLAN, such as an access point site and a non-access point site, but is not limited thereto.

Optionally, the method further includes: obtaining trigger frame indication information according to the second spatial multiplexing information in the physical frame of the radio frame. Determining that the detection result is a radio frame when the second spatial multiplexing information indicates that the spatial multiplexing delay is to the end of the radio frame Carrying a trigger frame; or, when the second spatial multiplexing information indicates that the spatial multiplexing time is limited before the end of the radio frame, determining that the detection result is a radio frame carrying trigger frame.

Optionally, before obtaining the first spatial multiplexing information, the method further includes: when the received signal strength of the radio frame is greater than or equal to a signal detection threshold of the overlapping basic service set of the station, the station receives the trigger frame to obtain the first spatial multiplexing. information.

In an optional implementation manner according to this embodiment, performing the first spatial multiplexing according to the first spatial multiplexing information at the end of the radio frame comprises: starting or restoring the back-off competition process at the end of the radio frame. Optionally, when the backoff competition process ends, a frame exchange sending process is started, where the duration of the frame exchange sending process does not exceed the reservation time of the radio frame or the uplink radio frame transmission time length indicated by the trigger frame. Optionally, when the backoff competition process ends, a frame exchange sending process is started, where the transmit power TX_PWR of the station in the frame exchange sending process is not greater than TX_PWR1, where TX_PWR1 is the value SRP indicated by the first spatial multiplexing information minus The difference in received signal strength RSSI of the radio frame.

In another optional implementation manner of this embodiment, when it is determined that the radio frame does not carry the trigger frame, or the first spatial multiplexing information indicates that multiplexing is not allowed, the method further includes: when the second spatial multiplexing is not satisfied In the condition, the local network allocation vector or the uplink radio frame transmission time length indicated by the trigger frame is updated according to the reservation time of the radio frame at the end of the radio frame. Optionally, when the received signal strength of the radio frame is greater than or equal to the station. When the signal detection threshold of the overlapping basic service set is overlapped, it is determined that the second spatial multiplexing condition is not satisfied. Illustratively, the local network allocation vector is updated to the reservation time of the radio frame only when the reservation time of the radio frame is greater than the local network allocation vector.

Optionally, the embodiment further includes determining, according to the first spatial multiplexing information, whether the first spatial multiplexing condition is met, and if the first multiplexing condition and the second spatial multiplexing condition are both satisfied, ignoring the update of the local network allocation vector; If the first spatial multiplexing condition is satisfied, the second spatial multiplexing condition is not satisfied, and the update of the local network allocation vector is ignored; if the first multiplexing condition and the second spatial multiplexing condition are not satisfied, the local network allocation vector is updated.

Optionally, when the second spatial multiplexing information indicates that the spatial multiplexing delay is to the end of the radio frame, the method further includes: if the received signal strength of the radio frame is smaller than a signal detection threshold of the overlapping basic service set of the station, determining that the first The second spatial multiplexing condition accepts the trigger frame to obtain the first spatial multiplexing information.

In an optional implementation manner according to the embodiment, performing spatial multiplexing according to the first spatial multiplexing information at the end of the radio frame includes: starting or restoring the back-off competition process at the end of the radio frame; at the end of the back-off competition process, The frame exchange transmission process is started; wherein the duration of the frame exchange transmission process does not exceed the reservation time of the radio frame; the transmission power TX_PWR of the frame exchange transmission process is not greater than the minimum values of TX_PWR1 and TX_PWR2. Wherein TX_PWR1 is the difference between the value SRP indicated by the first spatial multiplexing information minus the received signal strength RSSI of the radio frame, and TX_PWR2 is the maximum transmit power corresponding to the signal detection threshold of the overlapping basic service set of the station.

Optionally, when the second spatial multiplexing information indicates that the spatial multiplexing time is limited to the end of the radio frame, the method further includes: determining that the received signal strength of the radio frame is smaller than a signal detection threshold of the overlapping basic service set of the station, Second Spatial multiplexing conditions. The method of this embodiment further includes: stopping detecting the radio frame, and stopping receiving the trigger frame carried by the radio frame; starting or restoring the backoff competition process, and starting the frame exchange sending process when the backoff competition process ends; wherein, the frame exchange sending process The duration of the radio frame does not exceed the end time of the radio frame, and the transmit power TX_PWR of the station during the frame exchange transmission process is not greater than TX_PWR2. Where TX_PWR2 is the maximum transmit power corresponding to the signal detection threshold of the overlapping basic service set of the station.

The embodiment further provides another spatial multiplexing method, which is applied to the transmitting end station, and includes: sending a radio frame, where the physical layer signaling of the radio frame includes indication information that is set to indicate whether the radio frame is a trigger frame. .

In an optional implementation of this embodiment, the trigger frame is set to trigger an uplink transmission.

Optionally, the method for sending a radio frame includes: sending a radio frame in a single-user frame format, transmitting a radio frame in an extended-range single-user frame format, and transmitting a radio frame in a multi-user format.

Optionally, the indication information is carried in a common signaling domain in physical layer signaling of the radio frame.

Optionally, the indication information is represented by a specific value of a spatial multiplexing parameter information field in a common signaling domain in physical layer signaling of the radio frame, where the specific value indicates a spatial multiplexing delay to the end of the radio frame or space The multiplexing time is limited at the end of the radio frame, and the specific value simultaneously indicates that the radio frame is a trigger frame.

Optionally, the indication information is carried in a trigger frame indication field in a common signaling domain in physical layer signaling of the radio frame. The value of the trigger frame indication field is 1 or true, and the identifier of the triggering frame indication field is 0 or false. The identifier of the triggering frame does not carry the trigger frame.

The trigger frame indicates that the domain occupies N bits, where N>=1.

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, portions of the technical solutions of the present disclosure that contribute substantially or to the prior art may be embodied in the form of a software product stored in a storage medium (eg, ROM/RAM, disk, The optical disc includes a number of instructions for causing a terminal device (which may be a cell phone, a computer, a server, or a network device, etc.) to perform the methods of various embodiments of the present disclosure.

Example 2

In this embodiment, a device for spatial multiplexing is also provided, which is configured to implement the foregoing embodiments and preferred embodiments, and has not been described again. 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.

FIG. 3 is a structural block diagram of a device for spatial multiplexing according to an embodiment of the present disclosure, applied to an access point site of a wireless local area network, as shown in FIG. 3, the device includes:

The detecting module 30 is configured to receive the radio frame, and determine, according to the trigger frame indication information in the physical signaling domain of the radio frame, whether the radio frame carries a trigger frame that is set to trigger uplink multi-user transmission;

The processing module 32 is configured to: when determining that the radio frame carries the trigger frame, the station receives the trigger frame, and obtains the first spatial multiplexing information of the trigger frame;

The multiplexing module 34 is configured to determine whether to perform the first spatial multiplexing according to the first spatial multiplexing information at the end of the radio frame.

Optionally, the device further includes: an obtaining module, configured to obtain trigger frame indication information according to the second spatial multiplexing information in the radio frame physical signaling domain.

Optionally, the device further includes: a first determining module, configured to: when the second spatial multiplexing information indicates that the spatial multiplexing delay is to the end of the radio frame, determining that the detection result is a radio frame carrying trigger frame; the second determining module, setting When the second spatial multiplexing information indicates that the spatial multiplexing time is limited before the end of the radio frame, it is determined that the detection result is a radio frame carrying trigger frame.

The embodiment further provides another spatial multiplexing device, which is applied to an access point station of a wireless local area network, and the device includes: a sending module, configured to send a trigger frame of the wireless frame;

The physical layer signaling of the radio frame includes indication information that is set to indicate whether the radio frame is a trigger frame.

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 above modules are in any combination. The forms are located in different processors.

Example 3

This embodiment is in accordance with an alternative embodiment of the present disclosure, which is set forth in detail with reference to an exemplary example:

The principle of the OBSS_PD based SR technology is: when the station receives the PPDU, the BSS network identifier carried by the physical frame header or the MAC frame of the PPDU (Presentation Protocol Data Unit) - BSS color or partial BSS color, or partial BSSID/AID (partial basic service set identifier or partial association identifier) and GID information, or BSSID information, identify whether the PPDU belongs to the OBSS PPDU or the BSS PPDU; when the PPDU belongs to the OBSS PPDU, and the received signal strength RSSI of the PPDU is lower than the overlapping service Set the detection threshold OBSS_PD threshold, then the station can terminate receiving PPDUs and not update NAV. If then the station can start to evade the contention channel, and the transmit power at this time does not exceed the transmit power corresponding to the OBSS_PD threshold.

The SRP_based SR should be set to the HE (High efficient, efficient) trigger-based PPDU. The principle of the SRP_based SR technology is: when the site receives the HE trigger-based PPDU, it is identified by the BSS color carried by the physical frame header of the HE trigger-based PPDU. Whether the HE trigger-based PPDU belongs to the OBSS PPDU or the BSS PPDU; when it is identified that the HE trigger-based PPDU belongs to the OBSS PPDU, the station uses the spatial multiplexing parameter carried by the PPDU physical frame headspace re-use field (Spatial Reuse Parameter) , SRP), and the RSSI of the HEtrigger-based PPDU to calculate the maximum transmit power (SRP-RSSI) when the site is spatially multiplexed, then the station can terminate receiving the HE trigger-based PPDU without updating the NAV. The site begins to evade the competition channel, and The transmit power at this time does not exceed the maximum transmit power during spatial multiplexing, and the transmission duration does not exceed the end time of the HE trigger-based PPDU.

The SR in the related art has at least the following problem: if the station transmits a trigger frame (HE PPDU) in the HE format, the site de-posts the OBSS_PD based SR to the HE by setting the Spatial reuse field of the SIG-A in the HE preamble to SR_delay or SR_Restricted. The PPDU ends or the OBSS_PD based SR is restricted to be completed before the end of the HE PPDU. Then, when the multiplexing condition of the OBSS_PD based SR is satisfied, the station delays the OBSS_PD based SR to start after the end of the PPDU or limits the transmission time of the OBSS_PD based SR to the end of the PPDU. When the multiplexing condition is not satisfied, for example, when the RSSI of the OBSS PPDU is greater than the OBSS_PD threshold, the station performs the NAV update judging operation at the end of the OBSS PPDU. Even if the site can meet the multiplexing conditions of the subsequent OBSS HE trigger-based PPDU, the STA cannot perform the SRP_based SR operation because the NAV is set by the OBSS HE PPDU that previously carried the trigger.

In the solution of the embodiment, the station detects the OBSS radio frame. When the received signal strength of the radio frame is greater than the OBSS_PD threshold of the station, that is, the OBSS_PD based SR is not satisfied, the station indicates according to the spatial multiplexing information carried by the physical frame header. To read the trigger frame trigger frame carried by the OBSS radio frame and obtain spatial multiplexing information, and set it as SRP_based SR.

Example 1

Example 1 describes a spatial multiplexing method for an OBSS PPDU in a HE SU (Single User) format, and FIG. 4 is a schematic diagram of a spatial multiplexing method for an OBSS PPDU in a HE SU format received by a station in the embodiment of the present disclosure. See Figure 4.

There are BSS1 and BSS2 in the WLAN network. BSS1 has AP1 and STA1, and BSS2 has AP2 and STA2. AP1 and STA1, AP2, and STA2 are both HE sites and both support SRP-based SR.

When AP1 sends a HE SU PPDU to STA1, the PPDU carries a trigger frame. The SR field of the SIG-A field in the physical frame header HE preamble of the PPDU is SR_delay.

When receiving the HE SU PPDU, STA2 determines that the PPDU is an inter-BSS PPDU according to the BSS color field of the SIG-A domain in the preamble. At the same time, STA2 compares its own OBSS_PD threshold with the RSSI of the PPDU. When the RSSI is greater than the OBSS_PD threshold, the STA 2 obtains the value of the SR field by the SIG-A field (also called the second spatial multiplexing information) in the physical frame header HE preamble of the HE SU PPDU, and the STA 2 considers that the PPDU carries the trigger frame. Then, STA2 continues to receive the payload of the PPDU, obtains a trigger frame, and obtains the SR field field in the common Info. When the SR field is non-SR_Disallow and non-reserved, at this time STA 2 calculates a value of the transmit power TX_PWRSRP=SR field - RSSI. When the PPDU ends, STA2 does not update the NAV. If the channel detection result is idle at this time, STA2 starts to retreat from the competition SR TXOP. Note that the length of the SR TXOP cannot exceed the value of the duration field of the trigger, and the transmit power cannot exceed TX_PWRSRP. When the SR field is SR_Disallow or a reserved value, STA 2 updates the NAV according to the value of the Duration field in the trigger at the end of the HE SU PPDU: the NAV is updated to the value of the Duration field when the value of the Duration field is greater than the value of the NAV.

Example 2

When receiving the HE SU PPDU, STA2 determines that the PPDU is an inter-BSS PPDU according to the BSS color field of the SIG-A domain in the preamble. At the same time, STA2 compares its own OBSS_PD threshold with the RSSI of the PPDU. When the RSSI is smaller than the OBSS_PD threshold, the STA 2 passes the SR field of the SIG-A field in the physical frame header HE preamble of the PPDU, and then STA2 continues to receive the payload of the PPDU to obtain a trigger frame, and obtains the SR field field in the common Info. When the SR field is non-SR_Disallow, STA 2 calculates a value of the transmit power TX_PWRSRP=SR field field – RSSI. When the PPDU ends, STA2 does not update the NAV. STA2 starts or resumes the backoff competition SR TXOP. Note that the length of the SR TXOP cannot exceed the value of the trigger's duration field. And assuming that the transmission power corresponding to the OBSS_PD threshold of STA 2 is TX_PWROBSS_PD, the transmission power TX_PWR of STA 2 in the SR TXOP cannot exceed the minimum value between TX_PWROBSS_PD and TX_PWRSRP.

Example 3

Example 3 describes a spatial multiplexing method for a site to receive an OBSS PPDU in the HE SU format. FIG. 5 is a schematic diagram of a spatial multiplexing method for an OBSS PPDU in a HE extended range SU format received by a station according to an embodiment of the present disclosure.

When AP1 sends a HE extended range SU PPDU to STA1, the PPDU carries a trigger frame. The SR field (also called the second spatial multiplexing information) of the SIG-A field in the physical frame header HE preamble of the PPDU is SR_delay.

When receiving the HE extended range SU PPDU, STA2 determines that the PPDU is an inter-BSS PPDU according to the BSS color field of the SIG-A domain in the preamble. At the same time, STA2 compares its own OBSS_PD threshold with the RSSI of the PPDU. When the RSSI is greater than the OBSS_PD threshold, the STA 2 obtains the SR field value by the SIG-A field in the physical frame header HE preamble of the PPDU, and the STA2 considers that the PPDU carries the trigger frame, and the STA2 continues to receive the payload of the PPDU to obtain the trigger frame. , get the SR field field in common Info. When the SR field is non-SR_Disallow, STA 2 calculates a value of the transmit power TX_PWRSRP=SR field field – RSSI. When the PPDU ends, STA2 does not update the NAV. If the channel detection result is idle at this time, STA2 starts to retreat from the competition SR TXOP. Note that the length of the SR TXOP cannot exceed the value of the duration field of the trigger, and the transmit power cannot exceed TX_PWRSRP.

When the SR field is SR_Disallow or a reserved value, the STA 2 updates the NAV according to the value of the Duration field in the trigger at the end of the HE extended range SU PPDU: when the value of the Duration field is greater than the value of the NAV, the NAV is updated to the value of the Duration field. .

Example 4

When AP1 sends a HE extended range SU PPDU to STA1, the PPDU carries a trigger frame. The SR field of the SIG-A field in the physical frame header HE preamble of the PPDU is SR_delay.

When receiving the HE extended range SU PPDU, STA2 determines that the PPDU is an inter-BSS PPDU according to the BSScolor field of the SIG-A domain in the preamble. At the same time, STA2 compares its own OBSS_PD threshold with the RSSI of the PPDU. When the RSSI is smaller than the OBSS_PD threshold, the STA 2 passes the SR field of the SIG-A field in the physical frame header HE preamble of the PPDU, and then STA2 continues to receive the payload of the PPDU to obtain a trigger frame, and obtains the SR field field in the common Info. When the SR field is non-SR_Disallow, STA 2 calculates a value of the transmit power TX_PWRSRP=SR field field – RSSI. When the PPDU ends, STA2 does not update the NAV. STA2 began to evade competition for SR TXOP. Note that the length of the SR TXOP cannot exceed the value of the trigger's duration field. And assuming that the transmission power corresponding to the OBSS_PD threshold of STA 2 is TX_PWROBSS_PD, the transmission power TX_PWR of STA 2 in the SR TXOP cannot exceed the minimum value between TX_PWROBSS_PD and TX_PWRSRP.

Example 5

Example 5 describes a spatial multiplexing method for a site to receive an OBSS PPDU in a HE SU format, and FIG. 6 is a schematic diagram of a spatial multiplexing method for a site receiving an OBSS PPDU in a HE MU (Multiplex User) format according to an embodiment of the present disclosure. See Figure 6.

There are BSS1 and BSS2 in the WLAN network. BSS1 has AP1 and STA1a, STA1b, and BSS2 has AP2 and STA2. AP1, STA1a, STA1b, AP2, and STA2 are all HE sites, and both support SRP-based SR.

When AP1 sends an HE MU PPDU to STA1a and STA1b, the PPDU carries a trigger frame. The SR field (also called the second spatial multiplexing information) of the SIG-A field in the physical frame header HE preamble of the PPDU is SR_restricted.

When receiving the HE MU PPDU, STA2 determines that the PPDU is an inter-BSS PPDU according to the BSS color field of the SIG-A domain in the preamble. At the same time, STA2 compares its own OBSS_PD threshold with the RSSI of the PPDU. When the RSSI is greater than the OBSS_PD threshold, the STA 2 obtains the value of the SR field through the SIG-A field in the physical frame header HE preamble of the PPDU, and STA2 considers that the PPDU carries the trigger frame, and then the STA2 continues to receive the payload of the PPDU to obtain the trigger frame. , get the SR field field in common Info. When the SR field is non-SR_Disallow, STA 2 calculates a value of the transmit power TX_PWR=SR field - RSSI. When the PPDU ends, STA2 does not update the NAV. If the channel detection result is idle at this time, STA2 starts to retreat from the competition SR TXOP. Note that the length of the SR TXOP cannot exceed the value of the trigger's duration field.

When the SR field is SR_Disallow or a reserved value, STA 2 updates the NAV according to the value of the Duration field in the trigger at the end of the HE MU PPDU: the NAV is updated to the value of the Duration field when the value of the Duration field is greater than the value of the NAV.

Example 6

There are BSS1 and BSS2 in the WLAN network. BSS1 has AP1 and STA1, and BSS2 has AP2 and STA2. AP1 And STA1, AP2, and STA2 are both HE sites, and both support SRP-based SR.

When AP1 sends a non-HT PPDU to STA1, the PPDU carries a trigger frame. STA1 corresponds to an HE trigger-based PPDU after SIFs.

When STA2 receives the non-HT PPDU sent by AP1, STA2 continues to decode and receive the trigger frame. STA2 determines that the PPDU belongs to the OBSS PPDU according to the TA domain of the trigger; determines that the trigger frame belongs to the basic trigger frame according to the trigger frame subtype field; and obtains spatial multiplexing information according to the spatial multiplexing information field in the trigger frame.

When the nong-HT PPDU ends, the STA 2 judges the spatial multiplexing operation according to the comparison result of the RSSI and OBSS_PD thresholds of the non-HT PPDU and the spatial multiplexing information:

(1) When the RSSI is smaller than the OBSS_PD threshold and the spatial multiplexing information is not spatial multiplexing, STA2 does not update the NAV according to the Duration in the trigger, and STA2 starts the backoff competition process, and the transmission power does not exceed the maximum transmission corresponding to the OBSS_PD threshold. power;

(2) When the RSSI is smaller than the OBSS_PD threshold and the spatial multiplexing information is spatial multiplexing, STA2 does not update the NAV according to the Duration in the trigger, STA2 starts the backoff competition process, and the transmission power TX_PWR: TX_PWR<=min(TX_PWR2, TX_PWR1 ). TX_PWR2 is the maximum transmit power calculated according to the OBSS_PD threshold, and TX_PWR1 is the maximum transmit power obtained by subtracting the RSSI from the spatial multiplexing information.

(3) When the RSSI is greater than the OBSS_PD threshold and the spatial multiplexing information is spatial multiplexing, STA2 does not update the NAV according to the Duration in the trigger, and STA2 starts the backoff competition process, and the transmission power TX_PWR: TX_PWR<=TX_PWR1. Its TX_PWR1 is the maximum transmit power obtained by subtracting the RSSI from the spatial multiplexing information.

(4) When the RSSI is greater than the OBSS_PD threshold and the spatial multiplexing information is not spatial multiplexing, STA2 updates the NAV according to the Duration in the trigger.

Example 7

The AP1 sends the HE MU PPDU carrying the trigger frame to the STA1, and the AP1 sets the spatial multiplexing domain SR field of the physical signaling domain SIG-A field in the physical frame header HE preamble of the PPDU to be SR_restricted, to indicate that the PPDU carries the trigger. Frame trigger frame. or,

The AP1 sends a HE SU/Extend range SU PPDU carrying a trigger frame to the STA1, and the AP1 sets the spatial multiplexing domain SR field of the physical signaling domain SIG-A field in the PBR physical frame header HE preamble to SR_relay to indicate the PPDU. Carry the trigger frame trigger frame. or,

The AP1 sends a PPDU carrying a trigger frame to the STA1. The AP1 sets the trigger frame indication field in the physical signaling field in the physical frame header of the PPDU to 1 or true to indicate that the trigger frame is carried in the PPDU. When the trigger frame indication field in the physical signaling field of the PPDU is 0 or false, it indicates that the trigger frame is not carried in the PPDU. The trigger frame indicates that the domain occupies N bits, N>=1.

Example 8

This example exemplifies the process of OBSS_based SR. Taking the multiplexing of HE SU PPDU as an example, it is also applicable to the HE Extend range SU PPDU.

There are BSS1 and BSS2 in the WLAN network. BSS1 has AP1 and STA1, and BSS2 has AP2 and STA2. AP1 and STA1, AP2, and STA2 are both HE sites.

When AP1 sends the HE SU PPDU format to STA1 to send a trigger frame trigger frame. The SR field of the SIG-A field in the physical frame header HE preamble of the PPDU is set to SR_delay.

When receiving the HE SU PPDU, STA2 determines that the PPDU is an inter-BSS PPDU according to the BSS color field of the SIG-A domain in the preamble. At the same time, STA2 compares its own OBSS_PD threshold with the RSSI of the PPDU. When the RSSI is smaller than the OBSS_PD threshold, the STA 2 passes the SR field of the SIG-A domain in the physical frame header HE preamble of the PPDU, and then STA2 continues to receive the payload of the PPDU. When the PPDU ends, STA2 does not update the NAV. STA2 starts to retreat from the competition SR TXOP, and the length of the SR TXOP does not exceed the value of the TXOP_duration field of the PPDU. And assuming that the transmission power corresponding to the OBSS_PD threshold of STA 2 is TX_PWROBSS_PD, the transmission power TX_PWR of STA 2 in the SR TXOP cannot exceed TX_PWROBSS_PD.

In Example 7 and Example 8, when STA2 compares its own OBSS_PD threshold with the RSSI of the PPDU, if the RSSI is greater than the OBSS_PD threshold, STA2 cannot perform OBSS_PD based SR, STA2 continues to receive PPDUs, and updates the local network at the end of the PPDU. The allocation vector is the reservation time of the PPDU if the reservation time of the PPDU is greater than the local network allocation vector.

Example 9

This example exemplarily describes the process of OBSS_based SR, taking the multiplexing of HE MU PPDU as an example.

When AP1 sends the HE MU PPDU format to STA1 to send a trigger frame trigger frame. The SR field of the SIG-A field in the physical frame header HE preamble of the PPDU is set to SR_restricted.

When receiving the HE MU PPDU, STA2 determines that the PPDU is an inter-BSS PPDU according to the BSS color field of the SIG-A domain in the preamble. At the same time, STA2 compares its own OBSS_PD threshold with the RSSI of the PPDU. When the RSSI is smaller than the OBSS_PD threshold, the STA 2 passes the SR field of the SIG-A field in the physical frame header HE preamble of the PPDU to be SR_restricted, and then STA2 terminates the reception, and considers that the PPDU is not received. STA2 starts to retreat from the competition SR TXOP, and the length of the SR TXOP does not exceed the end time of the PPDU, which can be obtained through calculation of the L-SIG domain of the PPDU. And assuming that the transmission power corresponding to the OBSS_PD threshold of STA 2 is TX_PWROBSS_PD, the transmission power TX_PWR of STA 2 in the SR TXOP cannot exceed TX_PWROBSS_PD.

Example 10

This example exemplifies the process of SRP-based SR, taking the multiplexing of HE trigger-based PPDU as an example.

When AP1 sends the HE SU PPDU format to STA1 to send a trigger frame trigger frame. STA1 sends a response frame HE trigger-based PPDU.

When receiving the HE trigger-based PPDU, STA2 determines that the PPDU is an inter-BSS PPDU according to the BSS color field of the SIG-A domain in the preamble. At the same time, STA 2 calculates a maximum transmit power TX_PWRSRP=SRP-RSSI through the value SRP of the SR field of the SIG-A domain and the RSSI of the PPDU in the physical frame header HE preamble of the PPDU, and the RSSI is the HE SU PPDU sent by the AP1 to the STA 2 Power, if STA2 does not receive HE SU PPDU before, then RSSI can be replaced by STA2's lowest receiving sensitivity (such as -82dBm). STA2 terminates reception after receiving SIG-A, and considers that no PPDU has been received. STA2 starts to retreat from the competition SR TXOP, and the length of the SR TXOP does not exceed the end time of the PPDU, which can be obtained through calculation of the L-SIG domain of the PPDU. And the transmit power TX_PWR of STA 2 in the SR TXOP cannot exceed TX_PWRSRP.

With the solution of this embodiment, when the received OBSS PPDU does not satisfy the OBSS_PD based SR (also called the second spatial multiplexing), the station passes the spatial multiplexing information SR field in the trigger frame trigger frame in the OBSS PPDU (also called the first A spatial multiplexing information) performs SRP-based SR (also called first spatial multiplexing) on subsequent HE trigger-based PPDUs, thereby improving network performance.

Example 4

Embodiments of the present disclosure also provide a storage medium. Optionally, in the embodiment, the storage medium may be configured to store program code set to perform the following steps:

S1. Receive a radio frame, and determine, according to the trigger frame indication information in the physical signaling domain of the radio frame, whether the radio frame carries a trigger frame that is set to trigger uplink multi-user transmission.

S2. When determining that the radio frame carries the trigger frame, the station receives the trigger frame, and obtains the first spatial multiplexing information of the trigger frame.

S3. Determine, according to the first spatial multiplexing information, whether to perform the first spatial multiplexing at the end of the radio frame.

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 received radio frame according to the stored program code in the storage medium, and determines whether the radio frame is carried according to the trigger frame indication information in the physical frame of the radio frame to trigger the uplink. Trigger frame transmitted by the user;

Optionally, in this embodiment, the processor executes, according to the stored program code in the storage medium, when determining that the radio frame carries the trigger frame, the station receives the trigger frame, and obtains the first spatial multiplexing information of the trigger frame.

Optionally, in this embodiment, the processor determines, according to the stored program code in the storage medium, whether to perform the first spatial multiplexing according to the first spatial multiplexing information at the end of the radio frame.

For example, the 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.

It will be apparent to those skilled in the art that the various modules or steps of the present disclosure described above can be implemented by a general-purpose computing device that can be centralized on a single computing device or distributed across a network of 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 order herein. The steps shown or described are performed, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps thereof are fabricated as a single integrated circuit module. As such, the disclosure is not limited to any specific combination of hardware and software.

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

Industrial applicability

The spatial multiplexing method and device according to the present disclosure can solve the problem that the site in the related art has low efficiency in spatial multiplexing of radio frames, and achieves the technical effect of improving network performance.

Claims

A method of spatial multiplexing, including:

Receiving a radio frame, where the physical signaling domain of the radio frame includes a second spatial multiplexing information field;

The second spatial multiplexing information field carries the trigger frame indication information, and acquires the first spatial multiplexing information in the trigger frame.
The method of claim 1 wherein the trigger frame is arranged to trigger an uplink multi-user transmission.
The method of claim 1, wherein the first spatial multiplexing is performed when the first spatial multiplexing information indicates that spatial multiplexing is allowed.
The method of claim 3, wherein said performing the first spatial multiplexing comprises starting or restoring a back-off contention process at the end of the radio frame, and at the end of the back-off contention process, starting a frame exchange transmission process.
The method according to claim 1, wherein the acquiring the first spatial multiplexing information in the trigger frame according to the second spatial multiplexing information field carrying the triggering frame indication information comprises:

And determining, according to the second spatial multiplexing information field carrying the trigger frame indication information, that the trigger frame is received in the wireless frame;

Obtaining first spatial multiplexing information in the trigger frame.
The method of claim 1 wherein:

The trigger frame indication information includes spatial multiplexing delay information in the second spatial multiplexing information domain, or

The second spatial multiplexing spatial multiplexing restriction information in the information domain.
The method of claim 1 wherein the radio frame belongs to a radio frame that overlaps a basic service set.
The method of claim 7 wherein the received signal strength of the radio frame is greater than or equal to a signal detection threshold of the overlapping basic service set of the station.
The method of claim 4 wherein the method further comprises:

The duration of the frame exchange transmission process does not exceed the reservation time of the radio frame or the length of the uplink radio frame transmission time indicated by the trigger frame.
The method of claim 4 wherein the method further comprises:

The transmit power TX_PWR of the station in the frame exchange transmission process is not greater than TX_PWR1, wherein the TX_PWR1 is a value SRP indicated by the first spatial multiplexing information minus a difference of the received signal strength RSSI of the radio frame.
The method according to claim 1, wherein the first spatial multiplexing information indicates that when the spatial multiplexing is not allowed and the second spatial multiplexing condition is not satisfied, the reservation time of the radio frame is determined according to the radio frame The length updates the local network allocation vector.
The method of claim 1 wherein the method further comprises:

The first spatial multiplexing information indicates that spatial multiplexing is allowed, but when the second spatial multiplexing condition is not satisfied, the update of the local network allocation vector is ignored.
The method according to claim 11 or 12, wherein said second spatial multiplexing condition comprises said wireless The received signal strength of the frame is less than the signal detection threshold of the overlapping basic service set of the station.
A method of spatial multiplexing applied to a WLAN site, including:

Transmitting a radio frame, where the physical layer signaling of the radio frame includes indication information that is set to indicate whether the radio frame is a trigger frame.
The method of claim 14, wherein the trigger frame is set to trigger an uplink transmission.
The method of claim 14, wherein transmitting the radio frame comprises at least one of:

The wireless frame is transmitted in a single user frame format, the wireless frame is transmitted in an extended range single user frame format, and the wireless frame is transmitted in a multi-user format.
The method according to any one of claims 14 to 16, wherein the indication information is carried in a common signaling domain in the physical layer signaling of the radio frame.
The method according to claim 16, wherein said indication information is represented by a specific value of a spatial multiplexing parameter information field in a common signaling domain in said physical layer signaling of said radio frame, wherein The specific value indicates that the spatial multiplexing delay is to the end of the radio frame or the spatial multiplexing time is limited at the end of the radio frame, and the specific value simultaneously indicates that the radio frame is a trigger frame.
The method according to any one of claims 14 to 16, wherein the indication information is carried in a trigger frame indication field in a common signaling domain in the physical layer signaling of the radio frame.
The method according to claim 19, wherein the value of the trigger frame indication field is 1 or true, and the radio frame carries a trigger frame; the value of the trigger frame indication field is 0 or false, and the radio frame is identified as having no Carry a trigger frame.
The method of claim 19, wherein the trigger frame indicates that the domain occupies N bits, where N >
A spatial multiplexing device, comprising:

a receiving module, configured to receive a radio frame, where the physical signaling domain of the radio frame includes a second spatial multiplexing information field;

The processing module is configured to acquire, according to the second spatial multiplexing information field, trigger frame indication information, and acquire first spatial multiplexing information in the trigger frame.
The apparatus of claim 22 wherein the trigger frame is arranged to trigger an uplink multi-user transmission.
The apparatus of claim 22, wherein the first spatial multiplexing is performed when the first spatial multiplexing information indicates that spatial multiplexing is allowed.
The apparatus of claim 22 wherein said processing module comprises:

The first multiplexing unit is configured to start or resume the backoff competition process at the end of the radio frame, and start the frame exchange transmission process when the backoff competition process ends.
The apparatus of claim 22, wherein the receiving module comprises:

The determining unit is configured to: when the second spatial multiplexing information field carries the trigger frame indication information, determine that the trigger frame is received when the trigger frame is present in the wireless frame;

And a receiving unit, configured to acquire first spatial multiplexing information in the trigger frame.
A spatial multiplexing device for use in a WLAN site, including:

a sending module, configured to send a trigger frame of a radio frame;

The physical layer signaling of the radio frame includes indication information that is set to indicate whether the radio frame is a trigger frame.
A storage medium arranged to store a program code, the program code being arranged to perform the method of any one of claims 1 to 13, or to perform the method of any one of claims 14 to 21 .