Wireless communication method and wireless communication device for spatial multiplexing

Abstract

The invention provides a wireless communication method and wireless communication equipment for spatial multiplexing. According to the wireless communication method for spatial multiplexing, a piece of title information of a currently received data packet is decoded by a spatial multiplexing (SR) initiating device. Based on the decoding result, the SR initiating device determines to initiate the SR. And the SR initiating device discards the currently received data packet. The SR initiating device sends a virtual preamble signal to the SR response device. And the SR initiating device sends a spatial multiplexing data packet to the SR response device.

Description

Technical Field

[0001] The present invention relates to a wireless communication method and a wireless communication device for spatial multiplexing. Background Art

[0002] In the past few years, the popularity of mobile devices has sparked great interest in wireless local area network (LAN) technology, which is designed to provide fast wireless Internet services to these devices. This technology enables smartphones, smart tablets, laptops, portable multimedia players, embedded devices, etc. to access the Internet through short-range wireless communications within homes, businesses, and designated service areas.

[0003] The Institute of Electrical and Electronics Engineers (IEEE) 802.11 has been at the forefront of developing and commercializing various technical standards to support wireless local area networks. The original IEEE 802.11 standard operated in the crowded 2.4GHz frequency range, providing communication speeds of up to 11Mbps. Subsequently, IEEE 802.11b made improvements in the same frequency range, but the maximum speed was still 11Mbps. In contrast, the later commercialized IEEE 802.11a utilized the less crowded 5GHz band and increased the communication speed to a maximum of 54Mbps through Orthogonal Frequency Division Multiplexing (OFDM) technology. However, its communication range is shorter than that of IEEE 802.11b. On the other hand, IEEE 802.11g maintains compatibility with the 2.4GHz frequency band while achieving speeds of up to 54Mbps, becoming a popular choice due to its compatibility and improved range over IEEE 802.11a.

[0004] To address the limitations of wireless LAN speed, IEEE 802.11n emerged as a standard designed to improve network speed and reliability while extending the operating range. IEEE 802.11n supports high throughput (HT), with data processing speeds exceeding 540Mbps, and uses multiple inputs and multiple outputs (MIMO) technology. This involves using multiple antennas on the transmitting and receiving units to minimize transmission errors and optimize data speeds. In addition, the standard allows the use of a coding scheme to transmit overlapping copies of data to improve reliability.

[0005] As the demand for wireless LAN systems that support higher throughput than provided by IEEE 802.11n increased and applications diversified, the focus turned to IEEE 802.11ac. The standard supports wider bandwidth (from 80 to 160MHz) in the 5GHz frequency range. Although IEEE 802.11ac mainly operates in the 5GHz band, the initial 11ac chipsets maintain compatibility with the 2.4GHz band to support existing products. In theory, the standard can achieve wireless LAN speeds of at least 1Gbps for multiple sites and a minimum speed of at least 500Mbps for a single link. It achieves this by extending the concepts of IEEE 802.11n, including wider wireless frequency bandwidth (up to 160MHz), more MIMO spatial streams (up to 8), multi-user MIMO, and high-density modulation (up to 256QAM). In addition, IEEE 802.11ad introduces a scheme that utilizes the 60GHz frequency band to achieve speeds of up to 7Gbps through beamforming technology, which is suitable for high-bitrate media streams such as large data files and uncompressed high-definition (HD) video. However, its coverage is limited due to its difficulty in penetrating obstacles.

[0006] Meanwhile, discussions are ongoing on the development of next-generation wireless LAN standards that go beyond IEEE 802.11ac and 802.11ad, with a particular emphasis on achieving efficient and high-performance communications in dense environments. These environments require high-frequency efficient communications, both indoors and outdoors, and are characterized by the presence of a large number of stations and access points (APs). Various technologies are being explored to effectively address these communication challenges.

[0007] Unlike its predecessors, Wi-Fi 6 prioritizes improving spectral efficiency rather than just increasing throughput. A key component of Wi-Fi 6 is spatial reuse (SR), which significantly improves this efficiency. This article outlines the basic components of SR and its operating mechanisms.

[0008] Figure 1 The Overlapping Basic Service Set (OBSS) is displayed. Figure 1As shown, BSS1 and BSS2 are operating on the same channel and are able to detect each other with a Received Signal Strength Indicator (RSSI) above the Clear Channel Assessment (CCA) Signal Detection (SD) threshold. In the world of Wi-Fi, this CCA threshold is a key determinant when a device decides whether a channel is clear to transmit or if it should wait and back off. When a co-channel Basic Service Set (BSS) can be heard with an RSSI above the CCA threshold, it is called an Overlapping BSS (OBSS). In simple terms, BSS2 is considered to be the OBSS of BSS 1 and vice versa. Figure 1 In the figure, AP1 and AP2 refer to access points, and STA1-STA3 refer to clients (for example, but not limited to, Wi-Fi smartphones).

[0009] In previous Wi-Fi versions, the CCA thresholds were fixed, meaning that if an ongoing Wi-Fi transmission was detected with a high RSSI, all other potential transmitters had no choice but to back off and wait their turn. Wi-Fi 6, with its primary focus on optimizing spectrum usage, introduces a more flexible approach to spatial channel reuse. With Wi-Fi 6, a device, whether an access point (AP) or a client, can dynamically adjust its CCA threshold when seeking to transmit on an already busy channel. However, raising the CCA threshold, while necessary to prevent interference, also requires devices to lower their own transmit power when intending to transmit simultaneously. This is where spatial reuse (SR) comes into play. Thanks to SR, Wi-Fi 6 devices can transmit simultaneously while an OBSS transmission is ongoing, as long as the SR transmission is operating at a sufficiently low transmit power. For example, on an OBSS transmission, the SR transmission can be transmitted at a low enough transmit power. Figure 1 In this case, access point AP2 can transmit to client STA2 while the transmission between access point AP1 and client STA1 is in progress. In this way, SR maintains the courtesy of Carrier Sense Multiple Access with Collision Avoidance (CSMA / CA) while taking advantage of transmission opportunities missed by earlier Wi-Fi versions.

[0010] It is important to note that SR transmissions occur simultaneously with regular CSMA / CA transmissions. CSMA / CA-based transmissions continue to be the backbone of Wi-Fi, while SR transmissions improve spectral efficiency by creating more possibilities for parallel co-channel transmissions.

[0011] Two basic constraints govern SR transmissions: the SR transmission must not exceed the duration of the OBSS transmission, and the transmit (Tx) power used for the SR transmission must be low enough to prevent interference with the OBSS transmission.

[0012] From a device's perspective, transmissions originating from its own BSS are called "internal BSS" transmissions, while transmissions from the OBSS are called "external BSS" transmissions.

[0013] In the context of Wi-Fi 6's Spatial Reuse (SR), it is critical for a Wi-Fi device to distinguish between transmissions occurring within its own Basic Service Set (BSS) and transmissions from neighboring BSSs (referred to as external BSS transmissions). To facilitate this distinction, Wi-Fi 6 introduces the concept of "BSS color." This is an integer value from 1 to 63 that serves as an identifier for a specific BSS. In 802.11ax High Efficiency (HE) frames, this BSS color value is embedded, allowing Wi-Fi devices to distinguish whether the BSS of the transmission belongs to its own network or an overlapping BSS (OBSS).

[0014] BSS color information is strategically placed within the HE Physical Protocol Data Unit (PPDU). This placement ensures early detection of overlapping basic service sets (OBSS) transmissions. Due to the fast decoding capabilities of Wi-Fi 6 devices, Wi-Fi 6 devices can quickly identify OBSS transmissions. This fast identification enables devices to make intelligent decisions and transmit in parallel, thereby optimizing spatial channel reuse without delay and improving the efficiency of Wi-Fi 6 networks.

[0015] However, in the spatial reuse (SR) of the prior art, when the Wi-Fi device decodes the BSS color information in the PHY header of the currently received data packet and determines that the currently received data packet (i.e., the transmission BSS) does not belong to its own network (i.e., the Wi-Fi device determines that the currently received data packet is part of the OBSS), the Wi-Fi device may decide to start SR, where the Wi-Fi device that decides to start the SR operation is called an SR initiator. The SR initiator discards the currently received data packet and switches from the receiving function to the transmitting function. After the transmitting function of the SR initiator is activated (and the receiver of the SR initiator enters the idle state), the SR initiator sends a data packet to the SR responder, and the SR responder receives the data packet sent from the SR initiator.

[0016] However, when the PHY header information of the data packet is too short, the SR responder may not be able to decode the data packet sent from the SR initiator. If the PHY header information of the data packet is too short, the synchronization between the SR initiator and the SR responder cannot be performed well, resulting in decoding failure.

[0017] To solve this problem, in the prior art, the SR responding device reduces the modulation rate or the data rate. However, reducing the modulation rate or the data rate is not ideal for wireless communication. Summary of the invention

[0018] According to one embodiment, a wireless communication method is provided. The wireless communication method includes: a spatial reuse (SR) initiating device decodes a header information of a currently received data packet; based on a decoding result, determines that the SR initiating device initiates SR; the SR initiating device discards the currently received data packet; the SR initiating device sends a virtual preamble signal to an SR responding device; and the SR initiating device sends a spatial multiplexing data packet to the SR responding device.

[0019] According to another embodiment, a wireless communication device is provided. The wireless communication device includes: a communication unit; and a processor coupled to the communication unit. The processor is configured to: decode a header information of a currently received data packet; determine to start spatial multiplexing (SR) based on the decoding result; discard the currently received data packet; send a dummy preamble signal to a spatial multiplexing response device; and send a spatial multiplexing data packet to the spatial multiplexing response device.

[0020] In previous spatial multiplexing, when synchronization is not good, previous solutions need to reduce the modulation rate or data rate when transmitting spatial multiplexing packets, which will reduce the communication quality of spatial multiplexing. In addition, previous solutions may sometimes encounter PHY header decoding failure.

[0021] In one embodiment of the present application, before sending a spatial multiplexing data packet, the spatial multiplexing initiating device sends a short virtual preamble signal to the spatial multiplexing response device to return the receiver of the spatial multiplexing response device to an idle state. Therefore, when the receiver of the spatial multiplexing response device receives the spatial multiplexing data packet, the receiver of the spatial multiplexing response device does not need to discard the data packet, and the synchronization between the spatial multiplexing response device and the spatial multiplexing initiating device is good, making it easier to perform good decoding. Therefore, in one embodiment of the present application, the spatial multiplexing response device and the spatial multiplexing initiating device do not need to reduce the modulation rate or data rate when transmitting the spatial multiplexing data packet. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1The Overlapping Basic Service Set (OBSS) is displayed.

[0023] Figure 2 A wireless communication method according to an embodiment of the present application is shown.

[0024] Figure 3 A wireless communication method according to an embodiment of the present application is shown.

[0025] Figure 4 is a block diagram illustrating a configuration of a workstation according to one embodiment of the present invention.

[0026] Figure 5 is a block diagram illustrating the configuration of an access point (AP) according to an embodiment of the present invention.

[0027] In the following detailed description, for the purpose of explanation, numerous specific details are listed to provide a thorough understanding of the disclosed embodiments. However, it is apparent that one or more embodiments can be practiced without these specific details. In other cases, well-known structures and devices are schematically shown to simplify the illustration. DETAILED DESCRIPTION

[0028] The technical terms of the present disclosure are based on the general definitions in the technical field of the present disclosure. If the present disclosure describes or explains one or more terms, the definition of the terms is based on the description or explanation of the present disclosure. Each disclosed embodiment has one or more technical features. In possible implementations, those skilled in the art may selectively implement part or all of the technical features of any embodiment of the present disclosure, or selectively combine part or all of the technical features of the embodiments of the present disclosure.

[0029] Figure 2 A wireless communication method according to an embodiment of the present application is shown. Figure 2 As shown, the spatial reuse (SR) initiating device and the SR responding device may be, for example but not limited to, an access point (AP) or a client (for example but not limited to a Wi-Fi smartphone) or a workstation.

[0030] exist Figure 2In the SR initiator, the receiver of the SR initiator receives a data packet and decodes the OBSS color information contained in the physical layer (PHY) header (i.e., header information). When the SR initiator decodes the BSS color information indicating that the currently received data packet (i.e., the transmission BSS) does not belong to its own network (i.e., the currently received data packet is part of the OBSS), the SR initiator decides to start SR, wherein the Wi-Fi device that decides to start the SR operation is called the SR initiator. The SR initiator discards the currently received data packet and switches from the receiving function to the transmitting function.

[0031] After the transmitter of the SR initiating device is activated (and the receiver of the SR initiating device enters the idle state), the transmitter of the SR initiating device sends a short dummy preamble signal to the SR responding device. For example, but not limited to, the short dummy preamble signal can be all 1 (i.e., all bits of the short dummy preamble signal are logic 1) or all 0 (i.e., all bits of the short dummy preamble signal are logic 0), and the duration is 24μs. The SR responding device discards the currently received data packet and switches to decode the short dummy preamble signal, which is a strong signal. Since the short dummy preamble signal is very short, the SR responding device may fail to decode. In one embodiment of the present application, the decoding failure of the short dummy preamble signal is irrelevant because the short dummy preamble signal only contains dummy information. After receiving the short dummy preamble signal, the receiver of the SR responding device returns to the idle state. In addition, in one embodiment of the present application, when the SR responding device receives and decodes the short dummy preamble signal, the SR responding device does not need to respond to the SR initiating device with an acknowledgment (ACK) signal.

[0032] The transmitter of the SR initiating device then enters an idle state for another short period (referenced as an idle period), such as but not limited to 16 μs.

[0033] Then, the transmitter of the SR initiating device sends a spatially multiplexed data packet (for example, but not limited to, having a long period of about 2ms) to the SR responding device. When the receiver of the SR responding device receives the data packet (also referred to as "my BSS data packet"), since there is no data packet discarding behavior, the SR responding device can make full use of the PHY header of the data packet for synchronization. Therefore, in one embodiment of the present application, it is easier for the SR responding device to successfully decode the data packet even without reducing the modulation rate or data rate.

[0034] That is, in one embodiment of the present application, in the case of spatial multiplexing, both the SR responding device and the SR initiating device can transmit / receive data packets at a high modulation rate or a high data rate. Therefore, in one embodiment of the present application, the technical problem of reducing the modulation rate or the data rate due to synchronization failure is solved.

[0035] Figure 3 The wireless communication method according to one embodiment of the present application is shown. In step 310, a receiver of the SR initiating device detects a data packet.

[0036] In step 320, the SR initiator decodes the BSS color information in the PHY header of the currently received data packet to determine whether to start SR. When determining whether to start SR, the SR initiator determines whether the BSS color information indicates that the currently received data packet (i.e., the transmission BSS) belongs to its own network (i.e., whether the BSS color information indicates that the currently received data packet is part of the OBSS). When the SR initiator determines that the currently received data packet (i.e., the transmission BSS) does not belong to its own network (i.e., the SR initiator determines that the currently received data packet is part of the OBSS), the SR initiator decides to start SR.

[0037] In step 330, the SR initiating device discards the currently received data packet and switches from the receiving function to the transmitting function.

[0038] In step 340, after the transmitter of the SR initiator device is activated (and the receiver of the SR initiator device enters the idle state), the transmitter of the SR initiator device sends a short virtual preamble signal to the SR responder device. For example but not limited to, the short virtual preamble signal can be all 1s or all 0s and has a duration of 24μs. The SR responder device discards the currently received data packet and switches to decode the short virtual preamble signal, which is a strong signal.

[0039] In step 350, the transmitter of the SR initiating device waits for a short period. That is, the transmitter of the SR initiating device enters an idle state for a short period, such as but not limited to 16 μs.

[0040] In step 360, the transmitter of the SR initiating device sends a spatially multiplexed data packet (eg, but not limited to, having a long period of approximately 2 ms) to the SR responding device.

[0041] Figure 4 FIG. 4 is a block diagram illustrating the configuration of a workstation 400 according to an embodiment of the present invention. Figure 4 As shown, according to an embodiment of the present invention, the workstation 400 may include a processor 410, a communication unit 420, a user interface unit 440, a display unit 450, and a memory 460. The workstation 400 may be used to implement an SR initiating device or an SR responding device. The processor 410 is coupled to the communication unit 420, the user interface unit 440, the display unit 450, and the memory 460.

[0042] First, the communication unit 420 sends and receives wireless signals, such as wireless LAN packets, etc., and can be embedded in the work station 400 or provided as an external device. According to the embodiment, the communication unit 420 may include at least one communication module using different frequency bands. For example, the communication unit 420 may include communication modules with different frequency bands, such as 2.4GHz, 5GHz, and 60GHz. According to one embodiment, the work station 400 may include a communication module using a 6GHz or higher frequency band and a communication module using a 6GHz or lower frequency band. The corresponding communication module may wirelessly communicate with the AP or an external work station according to the wireless LAN standard of the frequency band supported by the corresponding communication module. The communication unit 420 may operate only one communication module at a time, or operate multiple communication modules simultaneously according to the performance and requirements of the work station 400. When the work station 400 includes multiple communication modules, each communication module may be implemented by an independent component, or multiple modules may be integrated into one chip. In one embodiment of the present invention, the communication unit 420 may represent a radio frequency communication module for processing radio frequency (RF) signals.

[0043] Next, the user interface unit 440 includes various types of input / output devices provided in the workstation 400. That is, the user interface unit 440 can receive user input by using various input devices, and the processor 410 can control the workstation 400 based on the received user input. In addition, the user interface unit 440 can perform output according to the command of the processor 410 by using various output devices.

[0044] Next, the display unit 450 outputs an image on the display screen. The display unit 450 can output various display objects, such as content executed by the processor 410 or a user interface based on a control command of the processor 410.

[0045] In addition, the memory 460 stores a control program and various result data used in the work station 400. The control program may include an access program required for the work station 400 to access the AP or an external work station.

[0046] The processor 410 may execute various commands or programs in the work station 400 and process data. In addition, the processor 410 may control the corresponding units of the work station 400 and control data transmission / reception between the units. According to an embodiment of the present invention, the processor 410 may execute a program for accessing the AP stored in the memory 460 and receive a communication configuration message transmitted by the AP. In addition, the processor 410 may read the priority condition information of the work station 400 contained in the communication configuration message and request access to the AP based on the priority condition information of the work station 400. The processor 410 may represent a main control unit of the work station 400, and according to an embodiment, the processor 410 may represent a control unit for individually controlling certain components of the work station 400, such as the communication unit 420, etc. That is, the processor 410 may be a modem for modulating and demodulating wireless signals transmitted and received from the communication unit 420. The processor 410 controls various operations of wireless signal transmission / reception of the work station 400 according to an embodiment of the present invention. The processor 410 may implement the receiver function and the transmitter function of the spatial multiplexing initiating device of one embodiment of the present application. The processor 410 includes a plurality of hardware circuits.

[0047] Figure 4 The workstation 400 shown is a block diagram according to an embodiment of the present invention, in which separate modules are shown as logically distinguished elements of the device. Therefore, the elements of the device can be installed in a single chip or multiple chips according to the design of the device. For example, the processor 410 and the communication unit 420 can be integrated into one chip or implemented as separate chips. In addition, in an embodiment of the present invention, some components of the workstation 400, such as the user interface unit 440 and the display unit 450, can be optionally provided in the workstation 400.

[0048] Figure 5 FIG. 5 is a block diagram of the configuration of an AP 500 according to an embodiment of the present invention. Figure 5 As shown, according to an embodiment of the present invention, AP 500 may include a processor 510, a communication unit 520, and a memory 560. Figure 5 In Figure 4 The components of the workstation 400 are the same as or correspond to the components of the AP 500, and repeated description will be omitted. In addition, the AP 500 can be used to implement a spatial multiplexing initiating device or a spatial multiplexing responding device in one embodiment of the present application. The processor 510 is coupled to the communication unit 520 and the memory 560.

[0049] Reference Figure 5 , the AP 500 includes a communication unit 520 for operating a BSS in at least one frequency band. Figure 5As described in the embodiment of the present invention, the communication unit 520 of the AP 500 may also include multiple communication modules using different frequency bands. That is, according to an embodiment of the present invention, the AP 500 may include two or more communication modules of different frequency bands, such as 2.4GHz, 5GHz and 60GHz. Preferably, the AP 500 may include a communication module using a frequency band of 6GHz or higher and a communication module using a frequency band of 6GHz or lower. The corresponding communication module may wirelessly communicate with the workstation according to the wireless local area network standard of the frequency band supported by the corresponding communication module. The communication unit 520 may operate only one communication module at a time, or operate multiple communication modules simultaneously according to the performance and requirements of the AP 500. In one embodiment of the present invention, the communication unit 520 may represent a radio frequency communication module for processing radio frequency (RF) signals.

[0050] Next, the memory 560 stores the control program and various result data used in the AP 500. The control program may include an access program for managing work site access. In addition, the processor 510 includes a plurality of hardware circuits. The processor 510 may control the corresponding units of the AP 500 and transmit / receive data between the units. According to an embodiment of the present invention, the processor 510 may execute the program for accessing the work site stored in the memory 560 and transmit a communication configuration message for one or more sites. In this case, the communication configuration message may include access priority condition information of the corresponding site.

[0051] In addition, the processor 510 performs access configuration according to the access request of the workstation. According to one embodiment, the processor 510 may be a modem for modulating and demodulating wireless signals transmitted and received from the communication unit 520. The processor 510 controls various operations such as wireless signal transmission / reception of the AP 500 according to an embodiment of the present invention. The processor 510 may implement the receiver function and the transmitter function of the spatial multiplexing initiator device of one embodiment of the present application.

[0052] In previous spatial multiplexing, when synchronization is not good, previous solutions need to reduce the modulation rate or data rate when transmitting spatial multiplexing packets, which will reduce the communication quality of spatial multiplexing. In addition, previous solutions may sometimes encounter PHY header decoding failure.

[0053] In one embodiment of the present application, before sending a spatial multiplexing data packet, the spatial multiplexing initiating device sends a short virtual preamble signal to the spatial multiplexing response device to return the receiver of the spatial multiplexing response device to an idle state. Therefore, when the receiver of the spatial multiplexing response device receives the spatial multiplexing data packet, the receiver of the spatial multiplexing response device does not need to discard the data packet, and the synchronization between the spatial multiplexing response device and the spatial multiplexing initiating device is good, making it easier to perform good decoding. Therefore, in one embodiment of the present application, the spatial multiplexing response device and the spatial multiplexing initiating device do not need to reduce the modulation rate or data rate when transmitting the spatial multiplexing data packet.

[0054] Although this document may describe many specific details, these should not be understood as limitations on the scope of the claimed invention or what may be claimed, but rather as descriptions of features of specific embodiments. Certain features described in this document as independent embodiments may also be implemented in combination in a single embodiment. Conversely, the various features described in a single embodiment may also be implemented separately in multiple embodiments or in any appropriate sub-combination. In addition, although the above-mentioned features may be described as working in certain combinations, or even initially claimed as such, in some cases one or more features may be deleted from the combination, and the claimed combination may point to a sub-combination or a variation of a sub-combination. Similarly, although the operations are shown in a particular order in the figures, this should not be understood as requiring that the operations be performed in the particular order shown or in sequence, or that all the operations shown must be performed in order to achieve the desired results.

[0055] Only a few examples and implementations are disclosed. Changes, modifications and enhancements may be made to the described examples and implementations based on what is disclosed, and other implementations may be made.

Claims

1. A wireless communication method for spatial multiplexing, characterized in that: Include: Decoding a header information of a data packet currently received by a spatial multiplexing initiating device; Based on a decoding result, determining that spatial multiplexing is initiated by the spatial multiplexing initiating device; The spatial multiplexing initiating device discards the currently received data packet; The spatial multiplexing initiating device sends a virtual preamble signal to a spatial multiplexing responding device; The spatial multiplexing initiating device sends a spatial multiplexing data packet to the spatial multiplexing responding device.

2. The wireless communication method according to claim 1, wherein: When the spatial multiplexing initiating device determines that the currently received data packet is part of an overlapping basic service set, the spatial multiplexing initiating device decides to start spatial multiplexing.

3. The wireless communication method according to claim 1, wherein: The virtual preamble signal contains all 1s or all 0s.

4. The wireless communication method according to claim 1, wherein: The duration of the virtual preamble signal is 24 μs.

5. The wireless communication method according to claim 1, wherein: When the spatial multiplexing responding device receives and decodes the virtual preamble signal from the spatial multiplexing initiating device, the spatial multiplexing responding device discards a second data packet and switches to decode the virtual preamble signal.

6. The wireless communication method according to claim 1, wherein: After the spatial multiplexing initiating device sends the virtual preamble signal to the spatial multiplexing responding device, a transmitter of the spatial multiplexing initiating device enters an idle state for a reference idle period.

7. The wireless communication method according to claim 6, wherein: The reference idle period is 16 μs.

8. The wireless communication method according to claim 6, wherein: After the reference idle period, the spatial multiplexing initiating device sends the spatial multiplexing data packet to the spatial multiplexing responding device.

9. The wireless communication method according to claim 1, wherein: The period of the spatial multiplexing data packet is 2ms.

10. A wireless communication device, characterized in that: Include: a communication unit; a processor coupled to the communication unit, The processor is configured as follows: Decoding a header information of a data packet currently received; Based on the decoding result, determine to start spatial multiplexing; Discard the currently received data packet; Sending a virtual preamble signal to the spatial multiplexing response device; A spatial multiplexing data packet is sent to the spatial multiplexing response device.

11. The wireless communication device according to claim 10, wherein: When the processor determines that the currently received data packet is part of an overlapping basic service set, the processor decides to enable spatial multiplexing.

12. The wireless communication device according to claim 10, wherein: The virtual preamble signal contains all 1s or all 0s.

13. The wireless communication device according to claim 10, wherein: The duration of the virtual preamble signal is 24 μs.

14. The wireless communication device according to claim 10, wherein: When receiving and decoding the virtual preamble signal, the spatial multiplexing response device discards a second data packet and switches to decode the virtual preamble signal.

15. The wireless communication device according to claim 10, wherein: After sending the virtual preamble signal to the spatial multiplexing response device, a transmitter of the wireless communication device enters an idle state for a reference idle period.

16. The wireless communication device according to claim 15, wherein: The reference idle period is 16 μs.

17. The wireless communication device according to claim 15, wherein: After the reference idle period, the wireless communication device sends the spatial multiplexing data packet to the spatial multiplexing response device.

18. The wireless communication device according to claim 10, wherein: The period of the spatial multiplexing data packet is 2ms.

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