TWI692954B - Method of wireless communication and associated device - Google Patents

Abstract

Systems and methods of expanding indication capabilities of existent PPDU preamble fields. The “GI+LTF Size” field is redefined to indicate a new combination of GI duration and HE-LTF size. The redefinition is indicated when the values of the two other existent fields, in combination, indicate an invalid scenario because the two values should have been mutually exclusive. Particularly, the DCM field and the STBC field are both set to the “enabled” mode as an indication for redefine the “GI+LTF Size” field. Upon receiving such a PPDU, a receiver is configured to resolve the PPDU as neither DCM nor STBC is enabled. Rather, the receiver interprets the particular combination of DCM and STBC values as an indication that the “GI+LTF Size” field is redefined to indicate the new combination of GI duration and HE-LTF size.

Description

Wireless communication method and equipment

The invention relates to the field of network communication, in particular to the field of communication protocols in Wi-Fi network communication.

In efficient wireless communication, the preamble of the Physical Layer Convergence Protocol (PLCP) protocol data unit (Presentation Protocol Data Unit, PPDU) may contain a high efficiency (HE) long training field (long training field, LTF) (HE-LTF) symbol, which can be used for channel estimation at the receiver. For example, the receiver may estimate multiple input multiple output (MIMO) channels between a set of constellation mappers and receiver chains based on HE-LTF. Or, if the PPDU uses Space Time Block Coding (STBC), then HE-LTF provides a method for the receiver to estimate the MIMO channel between the STBC encoder output and the receiver chain.

The IEEE802.11ax standards and specifications define the duration of HE-LTF through compression to optimize the performance of various scenarios. The HE physical layer can support LTF symbol durations of 3.2 μs (1x HE-LTF 1/4 compression), 6.4 μs (2x HE-LTF 1/2 compression) and 12.8 μs (4x HE-LTF uncompressed).

Between the symbols of the HE-LTF, a guard interval (GI) is inserted, which is used to prevent inter-symbol interference (ISI) caused by, for example, echo or reflection in the channel. Inserting GI between symbols allows echo to be resolved before the next symbol is transmitted Or reflection problems.

The long GI between symbols can effectively prevent ISI, but due to the increased idle time, it also inevitably increases the resource overhead (overhead). On the other hand, short GI can increase the throughput of data transmission. However, if the GI is too short, the number of ISI will increase, resulting in a reduction in transmission throughput.

For communication that complies with IEEE820.11n/ac/ax standards and specifications, beamforming is already the most commonly used communication transmission mode. In beamforming, the compressed channel state information (CSI) feedback discards the common angle of each feedback vector. Therefore, in the beamforming scenario, for single user (SU) MIMO and multi-user (MU) MIMO, 1x and 2x HE-LTF due to phase ambiguity between different subcarriers Sometimes it cannot be successfully inserted into 4x HE-LTF. Specifically, because of the many different channels, phase alignment does not guarantee that the interpolated channels match the actual channels. For some channels, the channel phase itself does not match the incoming alignment phase. In cases where phase alignment does not guarantee that the channel is inserted correctly, the usual solution is to use 4x LTF.

According to IEEE 802.11ax, 2 bits in the PPDU preamble are allocated to the "GI+LTF size" field to define 4 possible combinations of HE-LTF size and GI duration. In other words, "GI+LTF size"=0 means 1x HE-LTF and 0.8μs GI; "GI+LTF size"=1 means 2x HE-LTF and 0.8μs GI; "GI+LTF size"=2 It means 2x HE-LTF and GI of 1.6 μs; “GI+LTF size”=3 means 4x HE-LTF and GI of 3.2 μs. The four modes indicated by "GI+LTF size" are not the optimal combination for all types of PPDU transmission. In order to use 4x HE-LTF, all orthogonal frequency-division multiple access (OFDMA) symbols in the payload must use a GI of 3.2 μs. However, for most instances of SU MIMO or MU MIMO, the channel delay spread is shorter than 3.2 μs. Compared with GI of 0.8 μs, using GI of 3.2 μs reduces the data transfer rate to as high as about 21%.

Unfortunately, all the preamble bits of the existing PPDU structure have been used or reserved for Specific instructions, due to this limitation, it is difficult to introduce any additional HE-LTF/GI mode, because the "GI+LTF size" field has only 2 bits and cannot represent more than 4 combination options.

Therefore, the embodiments disclosed herein point to a mechanism to overcome the bit length limitation of the "GI+LTF size" field and provide an indication of one or more additional modes of GI duration and HE-LTF size in the PLCP PPDU Without any changes to the existing PPDU structure.

The embodiments of the present application redefine two existing fields in the PPDU preamble signal as the GI duration and HE- in combination with the field for indicating the GI/HE-LTF mode ("GI+LTF size" field) The indication of a new mode of LTF size (or referred to herein as "GI/HE-LTF mode"). Specifically, the values set by these two fields are traditionally represented as impossible or invalid scenarios by being combined together. When the receiver receives the PPDU, the specific combination of these two field values is interpreted as an indication (or part of the indication) of the new mode of GI/HE-LTF, and the original meaning indicated by these values alone is ignored.

In some embodiments, the Dual Sub-Carrier Modulation (DCM) field and the STBC field in the PPDU preamble signal are used to introduce a new mode of GI/HE-LTF size, which cannot be changed by "GI Any value in the "LTF size" field is indicated separately. The new mode can be 4x HE LTF and 0.8μs GI or 1x HE LTF and 0.4μs GI. To indicate this new mode, the DCM field and the STBC field are both set to 1 (both are enabled), and, for example, the "GI+LTF size" field is set to 3. Since for the PPDU, DCM and STBC cannot both be enabled, the receiver is configured to parse the PPDU as neither DCM nor STBC is enabled. More precisely, the receiver interprets the specific combination of DCM=1 and STBC=1 as an indication that the “GI+LTF size” field has been redefined. If the "GI+LTF size" field is set to 3, which itself indicates 4x LTF and 3.2 μs GI, the receiver processes it as an indication of the new mode of 4x LTF and 0.8 μs GI.

Therefore, according to an embodiment of the present application, by entering specific values of two other existing fields Line combination can advantageously indicate a GI/HE-LTF mode that cannot be indicated solely by the "GI+LTF size" field. This method advantageously uses the existing fields in the PPDU preamble effectively and expands the indication capabilities of these fields. Therefore, an indication of a new operating mode or other specifications is introduced without requiring changes to any format or structure in the existing PPDU preamble.

This application combines specific values of other existing fields in the PPDU preamble to provide an indication of one or more additional modes of GI duration and HE-LTF size without any change to the existing PPDU structure. Advantageously, the existing fields in the PPDU preamble signal can be effectively used, and the indication capability of these fields can be expanded.

The foregoing is the summary of the invention, and therefore only the simplification, summary, and details of the specific description are necessarily included. Those of ordinary skill in the art can understand that the content of the present invention is only illustrative, and not restrictive in any way. As defined only by the scope of the patent application, other aspects, inventive features, and beneficial effects of the present application will become apparent in the non-limiting specific embodiments described below.

111: GI+LTF size field

112: DCM field

113: STBC field

110: HE-SIG-A field

120: HE-LTF field

200, 300: process

201~205, 301~305: steps

400, 500: wireless communication equipment

430, 530: main processor

440, 540: transceiver

420, 520: memory

401~404, 501~504: antenna

410, 510: signal processor

411:TX FIFO

412: Encoder

413: scrambler

414: Interleaver

415: Constellation mapper

417: Inverse Discrete Fourier Transformer

416: GI and window insertion module

421: PPDU format

422: PPDU generation module

511: RX FIFO

512: Synchronizer

513: Channel Evaluator and Equalizer

514: decoder

515: Demapper

516: Deinterleaver

517: Fast Fourier Transformer

518: descrambler

521: PPDU format

522: PPDU processing module

FIG. 1 shows an exemplary HE SU PPDU field for representing a redefined GI/HE-LTF mode of PPDU according to an embodiment of the present application.

FIG. 2 is a flowchart describing an exemplary process of generating a PPDU including redefining the “GI+LTF size” field according to an embodiment of the present application.

FIG. 3 is a flowchart describing an exemplary process of parsing a PPDU with a redefined “GI+LTF size” field according to an embodiment of the present application.

FIG. 4 is a schematic diagram showing the configuration of an exemplary wireless communication device for generating a PPDU with a redefined GI/HE-LTF mode according to an embodiment of the present application.

FIG. 5 is a structural schematic diagram showing the configuration of an exemplary wireless communication device for parsing a received PPDU with a redefined GI/HE-LTF mode according to an embodiment of the present application.

The preferred embodiments of the present application are described in detail below, examples of which are shown in the following drawings. Although this application will be described in conjunction with preferred embodiments, it is understood that these embodiments are not intended to be limitations of this application. On the contrary, the coverage substitution, modification or equivalent made to this application may be included in the spirit and scope of this application defined by the patent scope of the attached application. In addition, in the following specific description of the embodiments of the present application, many specific details are explained in order to thoroughly understand the present application. However, those skilled in the art can recognize that this application can be implemented without these specific details. In other examples, well-known methods, programs, components and circuits are not described in detail in order to unnecessarily obscure aspects of the embodiments of the present application. Although a method can be described as multiple steps in sequence for clarity, the reference numbers need not indicate the order of these steps. It should be understood that some steps may be skipped and executed concurrently or without maintaining a strict sequence order. The drawings showing embodiments of the present application are semi-illustrated and will not be scaled, and in particular, some sizes are shown for clarity and are shown enlarged in the drawings. Similarly, although the views in the drawings generally show similar directions for convenience of description, such description in the drawings is arbitrary for most of the time. Generally this application can be operated in any way.

Mechanism of short guard interval (GI) indication in efficient WLAN

In summary, the embodiments of the present application provide a mechanism for extending the indication capability of the existing PPDU preamble signal field. In some embodiments, the "GI+LTF size" field is redefined to indicate a new mode (or redefined mode) of GI duration and HE-LTF size. When the values of two other existing fields are combined to indicate an invalid scenario, because these two values should have been mutually exclusive, this redefinition can be indicated.

With reference to the PLCP PPDU structure defined in the IEEE 802.11 family, the embodiments of the present application will be described in detail. However, this application is not limited to any specific data packet format or structure, nor to any specific industry standards or specifications.

FIG. 1 shows an exemplary HE SU PPDU field for representing an additional redefined GI/HE-LTF mode of PPDU according to an embodiment of the present application. As defined in the IEEE 802.11ax standards and specifications, it is assumed that the "GI+LTF size" field has 2 bits, and as shown in Table 1, the field itself may only represent 4 of the GI duration and LTF size A fixed combination.

The DCM field has 1 bit, and is used to indicate whether the DCM is applied to the data field for the indicated modulation and coding scheme (MCS). When the DCM field is set to 1, it means that DCM is applied (enabled); and when the DCM field is set to 0, it means that DCM is not applied. DCM is only used for MCS0, MCS 1, MCS 3 and MCS 4. The STBC field has 1 bit, and when the field is set to 1, it is usually used to indicate that the space-time block coding (STBC) is used on the PPDU. If STBC is applied, DCM is not applied. In this example, the GI+LTF size field 111, the DCM field 112, and the STBC field 113 are all included in the HE-SIG-A field 110 included in the PPDU preamble signal.

As mentioned above, it is desirable to be able to use other combinations of GI duration and LTF size, for example, 4x HE-LTF and GI duration shorter than 3.2 μs. According to an embodiment of the present application, as described in FIG. 1, the DCM field 112 and the STBC field 113 are both set to 1, to indicate that the “GI+LTF size” field 111 is redefined to indicate that except the table 1 Other than the four combinations shown. Therefore, the HE-LTF field 120 in the PPDU is configured to the indicated combination.

Since DCM enable and STBC enable are mutually exclusive for PPDU, the receiver is configured to resolve the PPDU carrying DCM=1 and STBC=1 as neither DCM nor STBC is enabled. More precisely, the receiver advantageously interprets the combination of DCM=1 and STBC=1 as an indication that the “GI+LTF size” field has been redefined. For example, if the "GI+LTF size" field is set to 3 (as shown), it originally indicated 4x LTF and 3.2 μs GI, but the receiver interpreted it as new for 4x LTF and 0.8 μs GI. Mode indication. If the "GI+LTF size" field is set to 0, it originally represented 1x LTF and 0.8 μs of GI, but the receiver interpreted it as an indication of the new mode of 1x LTF and 0.4 μs of GI. It can be understood that, without departing from the scope of the present application, any other newly defined modes of GI duration and LTF size may be indicated by the DCM field, the STBC field, and the "GI+LTF size" field. In addition, the present application is not limited to using the DCM field and the STBC field to indicate the redefinition of the "GI+LTF size" field. In order to implement the present invention, various appropriate fields initially assigned to indicate other specifications may also be used.

Therefore, according to an embodiment of the present application, by combining specific values of two other existing fields, a GI/HE-LTF mode that cannot be individually represented by the "GI+LTF size" field element can be advantageously indicated. This method advantageously makes it possible to effectively use the existing fields in the PPDU preamble and expand the indication capabilities of these fields. Therefore, new operating modes or other specifications can be introduced without requiring changes to any existing format or structure in the PPDU preamble.

FIG. 2 is a flowchart describing an exemplary process 200 for generating a PPDU including redefining the “GI+LTF size” field according to an embodiment of the present application. The process 200 can be determined by the relevant The element performs, for example, a wireless access point (AP) station (STA) or a non-AP STA. In this example, it is assumed that the "GI+LTF size" field, the DCM field, and the STBC field are all assigned the same indication function as described with reference to FIG.

In step 201, a redefined GI/HE-LTF mode using PPDUs (eg, 4x HE-LTF and 0.8 μs GI) is determined, which is not included in the "GI+LTF size" which can be composed of 2 bits alone In the mode indicated by the field. For example, because the PPDU will be transmitted in MIMO transmission, this redefined mode is selected. However, the application is not limited to this application.

In step 202, according to the redefinition, the "GI+LTF size" field is set to a redefined value to indicate the desired choice of HE-LTF size. For example, in this example, the "GI+LTF size" field is set to 3, which means 4x LTF. In 203, the DCM field is set to indicate the enable of DCM on the payload of the PPDU (eg, DCM=1), and the STBC field is set to indicate the enable of the STBC on the payload of the PPDU (eg, STBC=1). Since enabling DCM on the payload and enabling STBC are invalid scenarios, the enabled state setting indicates that neither DCM nor STBC of the payload is enabled, but indicates the value in the "GI+LTF size" field New mode for indicating GI/HE-LTF combination. In this example, when DCM=1 and STBC=1, “GI+LTF size”=3 does not represent 4x LTF and 3.2μs GI according to the original definition, but represents 4x LTF and 0.8μs according to the redefinition GI. For another example, when DCM=1 and STBC=1, “GI+LTF size”=0 may be used to indicate 1x LTF and GI of 0.4 μs.

Therefore, in step 204, the HE-LTF field of the PPDU is generated by using the redefinition mode (for example, 4x LTF and GI of 0.8 μs). In step 205, the PPDU is transmitted through the wireless network in SU MIMO transmission. The present application can also be used for other suitable types of transmission, for example, MU-MIMO transmission.

FIG. 3 is a flowchart describing an exemplary process 300 of parsing a PPDU with a redefined “GI+LTF size” field according to an embodiment of the present application. The process 300 may be performed by related elements in the receiver device, for example, AP STA or non-AP STA. For example, the received PPDU comes from the second The PPDU generation and transmission process described in the figure. In this example, it is assumed that the "GI+LTF size" field, the DCM field, and the STBC field are all assigned the same indication function as described with reference to FIGS. 1 and 2.

In step 301, a PPDU packet is received at the receiver. In step 302, the receiver detects that the DCM field in the PPDU preamble signal is set to indicate DCM enable on the PPDU payload (eg, DCM=1) and the STBC field is set to indicate the PPDU payload Enable STBC (for example, STBC=1). In response, the receiver interprets the PPDU as neither DCM nor STBC is enabled. In step 303, according to the redefinition of the "GI+LTF size" field, the receiver also determines whether the field is set to a valid value. For example, in this example, when DCM=1 and STBC=1, only “GI+LTF size”=3 is a valid value. Thus, in step 304, if it is detected that the "GI+LTF size" field is not set to a valid value, a PPDU error is declared. In step 305, if the "GI+LTF size" field indicates a valid value, the receiver, especially the channel evaluator, uses the redefined GI/HE-LTF mode, for example, 4x LTF and 0.8μs GI, Analyze the HE-LTF field. The payload data is parsed as neither DCM nor STBC is enabled.

The process 200 and the process 300 may be implemented as software logic, hardware logic, firmware logic, or a combination thereof.

FIG. 4 is a schematic diagram showing the configuration of an exemplary wireless communication device 400 for generating a PPDU with a redefined GI/HE-LTF mode according to an embodiment of the present application. The device 400 may be an AP STA or a non-AP STA, and may transmit the PPDU to another device through a wireless LAN. The device 400 is configured to generate a PPDU using the redefined GI duration and HE-LTF size, where the redefined GI duration and HE-LTF size cannot be individually represented by the "GI+LTF size" field.

The device 400 may be a general-purpose computer and any other type of computing device or network device, including a main processor 430, a memory 420, and a transceiver 440 coupled to an array of antennas 401-404. The transceiver 440 includes a signal processor 410 having various modules of transmission paths for generating each part of the PPDU or any other type of communication transmission unit. For example, the signal processor 410 includes Transmit First-In-First-Out (TX FIFO) 411, encoder 412, scrambler 413, interleaver 414, constellation mapper 415, inverse discrete Fourier transformer (IDFT ) 417 and GI and window insertion module 416.

The memory 420 stores a PPDU format 421, which includes a format with a redefined "GI+HE-LTF size" field. The PPDU generation module 422 stores processor-executable instructions for generating a data sequence and the configuration of other parts of the PPDU according to the PPDU format 421. As specifically described in conjunction with FIGS. 1 and 2, the PPDU generation module 422 may decide to use the redefined GI/HE-LTF mode, and the signal processor 410 generates the preamble signal and the HE-LTF field accordingly.

FIG. 5 is a structural schematic diagram illustrating the configuration of an exemplary wireless communication device 500 for parsing a received PPDU with a redefined GI/HE-LTF mode according to an embodiment of the present application. The device 500 may be an AP STA or a non-AP STA, and may transmit the PPDU to another device through a wireless LAN. The device 500 is configured to parse the received PPDU using a combination of the redefined GI duration and HE-LTF size, which combination cannot be represented by the "GI+LTF size" field alone.

The device 500 may be a general-purpose computer and any other type of computing device or network device, including a main processor 530, a memory 520, and a transceiver 540 coupled to an array of antennas 501-504. The transceiver 540 includes a signal processor 510 having various modules of transmission paths for processing PPDUs or any other type of communication transmission unit. For example, the signal processor 510 includes a receive first-in-first-out (RX FIFO) 511, a synchronizer 512, a channel evaluator and an equalizer 513, a decoder 514, and a demapper 515 , A deinterleaver 516, a fast Fourier transformer (FFT) 517 and a descrambler 518.

The memory 520 stores a PPDU format 521, and the PPDU format 521 includes a format for redefining the "GI+HE-LTF size" field. The PPDU processing module 522 stores processor executable instructions for parsing different parts of the PPDU (including preamble signals) according to the PPDU format 521. As specifically described in conjunction with FIGS. 1 and 3, as long as the signal processor 510 detects the DCM field, the STBC field, and the “GI+ The "HE-LTF size" field is combined to represent the redefined GI/HE-LTF mode, and the signal processor 510 processes the preamble signal and the HE-LTF field accordingly based on the instruction from the PPDU processing module 522.

It can be understood that the signal processors in FIGS. 4 and 5 may include other suitable components in a broad scope known in the art. The different elements can be implemented in any suitable manner known in the art, and can be implemented using hardware logic, software logic, or a combination thereof. In addition, in some embodiments, the transceiver 410 in FIG. 4 may also include elements in the receiving path as specifically described in conjunction with the transceiver 510 in FIG. 5, and vice versa.

Although this application discloses some preferred embodiments and methods, based on the above disclosure, it is obvious to those skilled in the art that these embodiments and methods can be modified or modified without departing from the spirit and scope of this application . This application is limited only by the provisions and principles of applicable law and the content required by the scope of the attached patent application. The above are only the preferred embodiments of the present invention, and all changes and modifications made in accordance with the scope of the patent application of the present invention shall fall within the scope of the present invention.

111: GI+LTF size field

112: DCM field

113: STBC field

110: HE-SIG-A field

120: HE-LTF field

Claims (22)

A wireless communication method, which includes: setting a value of a first field of a Protocol Data Unit (PPDU) of a Physical Layer Convergence Protocol (PLCP) to indicate a selected high-efficiency long training field (high efficiency long training field, HE-LTF) mode; according to the first field: setting the value of the second field of the PPDU to indicate dual sub-carrier modulation (Dual Sub) modulation on the data field of the PPDU -Carrier Modulation, DCM); and setting the value of the third field of the PPDU to indicate the enabling of the Space Time Block Coding (STBC) in the data field of the PPDU, Wherein the second field of the PPDU is set to indicate the enabling of the DCM; and the PPDU is transmitted, wherein the value of the second field set and the value of the third field set The combination of values indicates that neither the DCM nor the STBC is enabled on the PPDU, and the combination further indicates that the value of the first field includes the validity of the guard interval (GI) value. The wireless communication method as described in item 1 of the patent application scope, wherein the selected HE-LTF mode includes a 4x HE-LTF mode, in which the first field is set and the second field is set with the second The three fields enable the first field to also indicate a guard interval (GI) of less than 3.2 μs. The wireless communication method as described in item 2 of the patent application scope, wherein the setting of the first field and the setting of the second field and the third field are such that the first field also indicates protection of 0.8 μs interval. The wireless communication method according to item 1 of the patent application scope, wherein the first field, the second field, and the third field are included in the HE-SIG-A field of the PPDU . The wireless communication method according to item 1 of the patent application scope, wherein the transmission includes transmitting the PPDU in a single-user transmission. A wireless communication method, comprising: receiving a physical layer convergence protocol PLCP protocol data unit PPDU; in response to the receiving, determining the value of the first field in the PPDU indicates a 4x high-efficiency long training field HE-LTF; responding In the receiving, it is determined that the value of the second field in the PPDU indicates the enabling of dual subcarrier modulation DCM on the data field of the PPDU; in response to the receiving, determining the third field in the PPDU The value of the bit indicates that the block encoding STBC is enabled when the data field of the PPDU is empty, wherein the second field of the PPDU indicates the enable of the DCM on the data field; Each of the determinations, by using a guard interval GI of less than 3.2 μs, parsing the HE-LTF field of the PPDU, wherein the parsing includes determining the third field based on the determined value of the second field The value of the field resolves the PPDU to that neither the DCM nor the STBC is applied to the PPDU. The wireless communication method as described in item 6 of the patent application range, wherein the parsing includes parsing the PPDU by using a guard interval equal to 0.8 μs. The wireless communication method according to item 6 of the patent application scope, which further includes: determining: the value of the first field in the PPDU indicates a non-4x HE-LTF mode; and the second in the PPDU The value of the field indicates the enabling of the DCM on the data field of the PPDU; and the value of the third field in the PPDU indicates the STBC on the data field of the PPDU Enable; and declare an error of the PPDU. A wireless communication device for transmitting a protocol data unit PPDU through a wireless communication network, the device includes: a memory; a processor, coupled to the memory; an antenna; and a transceiver, the transceiver includes a signal processor , And is coupled to the processor, the memory and the antenna, the transceiver is used to: set the value of the first field of the physical layer convergence protocol PLCP protocol data unit PPDU to indicate the selected high efficiency Training field HE-LTF mode; setting the value of the second field of the PPDU to indicate the enabling of dual subcarrier modulation DCM on the data field of the PPDU; setting the value of the third field of the PPDU The value is set to indicate that the block coding STBC is enabled when the data field of the PPDU is empty, wherein the second field of the PPDU is set to indicate the enable of the DCM; and the PPDU is sent To the antenna for transmission on the wireless communication network, The combination of the set value of the second field and the set value of the third field indicates that neither the DCM nor the STBC is enabled on the PPDU, and the combination further indicates The value of the first field includes a valid value for indicating a guard interval (GI). The wireless communication device according to item 9 of the patent application scope, wherein the selected HE-LTF mode includes a 4x HE-LTF mode. The wireless communication device as described in item 9 of the patent application range, wherein the first field also indicates a guard interval of less than 3.2 μs. The wireless communication device as described in item 9 of the patent application range, wherein the first field also indicates a guard interval of 0.8 μs. The wireless communication device according to item 9 of the patent application scope, wherein the first field, the second field, and the third field are included in a preamble signal of the PPDU. The wireless communication device according to item 9 of the patent application scope, wherein the PPDU is transmitted in single-user transmission. A wireless communication device for receiving a protocol data unit PPDU through a wireless communication device, the device includes: a memory; a processor, coupled to the memory; and a transceiver, including a signal processor, and used for: Receive the physical layer convergence protocol PLCP protocol data unit PPDU transmitted through the wireless network; in response to receiving the PPDU, determine the value of the first field in the PPDU to indicate the selected high-efficiency long training field HE-LTF mode; In response to receiving the PPDU, determine that the value of the second field in the PPDU indicates the enablement of dual subcarrier modulation DCM on the data field of the PPDU; and in response to receiving the PPDU, determine in the PPDU The value of the third field of indicates the enablement of the space-time block coding STBC of the PPDU, wherein the second field of the PPDU indicates the enablement of the DCM on the data field; and based on the The value of the first field, the value of the second field, and the value of the third field, by using a guard interval GI of less than 3.2 μs, parse the PPDU, where the parsing includes The value of the second field and the determined value of the third field parse the PPDU into a data field that neither the DCM nor the STBC applies to the PPDU. The wireless communication device according to item 15 of the patent application scope, wherein the transceiver is used to parse the PPDU by using a guard interval equal to 0.8 μs. The wireless communication device according to item 15 of the patent application scope, wherein the selected HE-LTF mode includes a 4xHE-LTF mode. The wireless communication device according to item 15 of the patent application scope, wherein the transceiver is further used to determine: the value of the first field in the PPDU indicates a non-4x HE-LTF mode; the The value of the second field indicates that the data field of the PPDU Enabling of DCM; and the value of the third field in the PPDU indicates the enabling of the STBC on the data field of the PPDU, wherein the second field of the PPDU indicates the Enabling the DCM on the data field; and based on the first field, the second field, and the third field, declaring an error of the PPDU. A wireless communication method, comprising: receiving a physical layer convergence agreement PLCP agreement data unit PPDU; determining that the value of the received dual subcarrier modulation DCM field in the PPDU indicates the use of DCM on the data field of the PPDU Enable, and determine that the value of the space-time block code STBC field in the received PPDU indicates the enablement of STBC on the data field of the PPDU; determine the guard interval + long training in the received PPDU Whether the GI+LTF size field of the field is set to a valid value; and if the GI+LTF size field in the PPDU is set to a valid value, then the redefined GI and LTF modes are used to resolve the High-efficiency long training field HE-LTF field of PPDU, wherein the parsing includes parsing the PPDU into the DCM and the field based on the determined value of the DCM field and the determined value of the STBC field None of the STBC mentioned above is applied to the data field of the PPDU. The wireless communication method as described in item 19 of the patent application range, wherein the effective value indicates that the value of the GI+LTF size field is 3. The wireless communication method as described in item 20 of the patent application range, wherein the redefined GI and LTF size modes indicate a 4x HE-LTF mode and a GI of 0.8 μs. The wireless communication method according to item 19 of the patent application scope, wherein if it is determined that the GI+LTF size field in the received PPDU is set to an invalid value, an error of the PPDU is declared.

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