CN111770524A

CN111770524A - EHT PPDU detection method and related product

Info

Publication number: CN111770524A
Application number: CN201910261741.8A
Authority: CN
Inventors: 梁丹丹; 淦明; 左鑫
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2019-04-02
Filing date: 2019-04-02
Publication date: 2020-10-13
Also published as: WO2020200253A1

Abstract

The embodiment of the application discloses a detection method of EHT PPDU, which comprises the following steps: if the PPDU to be detected is transmitted on the 6GHz frequency band, determining that the PPDU to be detected contains the EHT PPDU, and then identifying the EHT PPDU by using the symbol of the EHT PPDU, wherein the main channel of the EHT PPDU is arranged on the 6GHz frequency band. Alternatively, the method comprises: if the bandwidth of the PPDU to be detected is larger than or equal to X MHz, determining that the PPDU to be detected contains an EHT PPDU, and identifying the EHT PPDU by using the symbol of the EHT PPDU, wherein the frequency band where the EHT PPDU is located is provided with the lowest bandwidth of X MHz. The application provides a detection method of the EHT PPDU aiming at a new generation of wireless local area network protocol, and the EHT PPDU can be quickly identified by using the low-overhead PPDU.

Description

EHT PPDU detection method and related product

Technical Field

The present application relates to the field of communications technologies, and in particular, to a method for detecting an extra high throughput physical layer protocol data unit (EHT PPDU) and a related product.

Background

After 802.11ax release, the Federal Communications Commission (FCC) opened a new free band of 5925 and 7125MHz, which will be referred to as 6 GHz. Thus, 802.11ax standards workers in the 802.11ax Project Authorization Requests (PARs) have expanded the 802.11ax device operating range from 2.4GHz, 5GHz to 2.4GHz, 5GHz, and 6GHz, but the maximum bandwidth 160M supported by the standard protocols specifically involved, such as the frame structure, has not changed.

Each generation of the Wireless Fidelity (WiFi) protocol is compatible with legacy stations, for example, the 802.11a frame structure of the first generation of WiFi is started with a preamble, which includes a legacy-short-training-sequence field (L-STF), a legacy-long-training-sequence field (L-LTF), a legacy-signal field (L-SIG), and then the preamble of 802.11a is called a legacy preamble. Subsequent mainstream WiFi protocols 802.11g, 802.11n, 802.11ac, and finalized 802.11ax, in order to be compatible with legacy stations, their frame structures all begin with legacy preambles. An Institute of Electrical and Electronics Engineers (IEEE) 802.11 next generation WiFi protocol (EHT) device needs to be forward compatible, that is, the EHT device will support the operating spectrum of 802.11ax devices, that is, the 2.4GHz, 5GHz, and 6GHz bands. Next generation WIFI protocols also need to be forward compatible, with the frame structure starting with a legacy preamble followed by a new generation preamble.

In the process of data transmission, a receiving end needs to determine which 802.11 protocol the received information follows, so that information for automatically detecting which 802.11 protocol the PPDU belongs to is carried in a physical layer protocol data unit (PPDU) of the 802.11 protocol. For example, for 802.11n, 2 Orthogonal Frequency Division Multiplexing (OFDM) symbols of HT-SIG in a PPDU are all modulated by QBPSK (quadrature binary phase shift keying), and therefore, it is only necessary to determine that 2 symbols of HT-SIG in the PPDU are all modulated by QBPSK, and it is determined that the received PPDU is an 802.11n PPDU (i.e., HT PPDU). Therefore, for the next generation WiFi protocol, a method of determining whether the received PPDU is an EHT PPDU is also required.

Disclosure of Invention

An embodiment of the present application provides a method for detecting an EHT PPDU and a related product, so as to enable a receiving end to identify whether a received PPDU is an EHT PPDU when data transmission is performed.

In one aspect, an embodiment of the present application provides a method for detecting an EHT PPDU, where a main channel of the EHT PPDU is set in a 6GHz frequency band, and the method includes:

if the PPDU to be detected is transmitted on the 6GHz frequency band, determining that the PPDU to be detected contains the EHT PPDU, and then identifying the EHT PPDU by using the symbol of the EHT PPDU.

In this embodiment of the present application, since the main channel of the EHT PPDU is set on the 6GHz band, a receiving end may preliminarily distinguish the type of the PPDU to be detected by determining the received band of the PPDU to be detected, that is, if the PPDU to be detected is transmitted on the 6GHz band, the type of the PPDU which cannot operate on the 6GHz band may be excluded, and it is determined that the PPDU to be detected may include the EHT PPDU, and then it may continue to identify whether the PPDU to be detected is an EHT PPDU according to the symbol of the EHT PPDU.

In one possible embodiment, the determining that the PPDU to be detected includes an EHT PPDU includes:

determining that the PPDU to be detected is an EHT PPDU or a high efficiency physical layer protocol data unit (HE PPDU);

or determining that the PPDU to be detected is an EHT PPDU, an HE PPDU or a Non-high throughput physical layer protocol data unit (Non-HT (legacy) PPDU).

In the embodiment of the present application, HE PPDU and Non-ht (legacy) PPDU may also be transmitted on the 6GHz band in addition to the EHT PPDU. Therefore, after determining that the PPDU to be detected is transmitted on the 6GHz band, it may be determined that the PPDU to be detected is an EHT PPDU or an HE PPDU (Non-ht (legacy) PPDU cannot be transmitted on the 6GHz band); or determining that the PPDU to be detected is an EHT PPDU, an HE PPDU or a Non-ht (legacy) PPDU (set Non-ht (legacy) PPDU) can transmit on a 6GHz band.

In one possible embodiment, in a preamble of the EHT PPDU, symbols of a first symbol and a second symbol after a long training sequence field (LTF) are not the same;

the identifying the EHT PPDU using the symbol of the EHT PPDU comprises:

and if the symbols of the first symbol and the second symbol after the L-LTF are the same, determining that the PPDU to be detected is an HE PPDU.

In the embodiment of the present application, since a repeated legacy-signaling field (RL-SIG) identical to that of the L-STG exists in a preamble format of a frame structure of the HE PPDU, after determining that the PPDU to be detected is an EHT PPDU or an HE PPDU, or after determining that the PPDU to be detected is a Non-ht (legacy) PPDU, an EHT PPDU or an HE PPDU, and in a case that the EHT does not multiplex a pu format of the HE pdu, that is, in a case that no RL-SIG exists in the format of the EHT PPDU, whether the PPDU to be detected is an HE PPDU may be determined by determining whether a first symbol (corresponding to the L-SIG) and a second symbol (corresponding to the RL-SIG) after the LTF in the PPDU to be detected are identical.

In a possible embodiment, in the preamble format of the EHT PPDU, a first symbol after an EHT-LTF of an ultra high throughput green field mode physical layer protocol data unit (EHT-GF PPDU) is modulated by QBPSK; the identifying the EHT PPDU using the symbol of the EHT PPDU comprises:

and if the first symbol after the LTF of the PPDU to be detected is modulated by QBPSK, determining that the EHT PPDU is an EHT-GF PPDU.

In the embodiment of the present application, since the main channel of the EHT PPDU is set on the 6GHz band and the HT-GF PPDU cannot transmit on the 6GHz band, the EHT PPDU format may multiplex the HT-GF PPDU format as the EHT-GF PPDU. In case of multiplexing the format of the HT-GF PPDU by the EHT PPDU, the format of the EHT-GF PPDU differs from the HE PPDU and Non-HT (legacy) PPDU in that the first symbol after the EHT-LTF is QBPSK modulated. Therefore, under the condition that the EHT PPDU multiplexes the HT-GF PPDU format, after the PPDU to be detected is determined to be the HE PPDU, the Non-HT (legacy) PPDU or the EHTPPDU, whether the PPDU to be detected is the EHT-GF PPDU or not can be determined by judging whether the first symbol after the LTF of the PPDU to be detected adopts QBPSK modulation or not.

In a possible embodiment, each symbol in the preamble format of the EHT-GF PPDU is, in order:

EHT-GF-STF、EHT-LTF、EHT-SIG1QBPSK、EHT-SIG2QBPSK。

in the embodiment of the application, because the main channel of the EHT PPDU is arranged on the 6GHz frequency band and the HT-GF PPDU cannot be transmitted on the 6GHz frequency band, the format of the HT-GF PPDU can be multiplexed by the EHT PPDU format, and the lead code overhead of the EHT PPDU can be reduced by the EHT-GF PPDU format, so that whether the PPDU to be detected is the EHT-GF PPDU or not can be detected quickly.

In one possible embodiment, in a preamble format of the EHT PPDU, a first symbol or a second symbol following an L-SIG of an ultra high throughput mixed mode physical layer protocol data unit (EHT-MF PPDU) is QBPSK modulated, and the EHT PPDU is identified using the symbol of the EHT PPDU, including:

and if the first symbol or the second symbol after the L-SIG of the PPDU to be detected is modulated by QBPSK, determining that the PPDU to be detected is an EHT PPDU.

In this embodiment, since the main channel of the EHT PPDU is set on the 6GHz band and the HT PPDU cannot transmit on the 6GHz band, the EHT PPDU format may multiplex the format of the HT PPDU as the EHT PPDU. In case that the EHT PPDU multiplexes the HT PPDU format, the format of the EHT PPDU is different from that of the HE PPDU in that a first symbol or a second symbol after L-SIG of the EHT PPDU is QBPSK modulated. Therefore, in a case where the EHT PPDU may multiplex the HT PPDU format, after determining that the PPDU to be detected is the EHT PPDU, the HE PPDU, or the Non-HT (legacy) PPDU, or after determining that the PPDU to be detected is the EHT PPDU or the HE PPDU, it may be quickly determined whether the PPDU to be detected is the EHT PPDU or the HE PPDU by performing the above-described steps.

In a possible implementation manner, the preamble format of the EHT-MF PPDU sequentially includes: L-STF, L-LTF, L-SIG BPSK, EHT-SIG1-QBPSK, EHT-SIG 2-QBPSK;

the preamble format of the EHT PPDU sequentially includes: L-STF, L-LTF, L-SIG BPSK, EHT-SIG1-BPSK, EHT-SIG 2-QBPSK.

In this embodiment of the present application, since a main channel of the EHT PPDU is disposed on a 6GHz band, and the HT PPDU and the VHT PPDU cannot be transmitted on the 6GHz band, a format of the EHT PPDU may multiplex formats of the HT PPDU and the VHT PPDU, and a format of the HT PPDU and the VHT PPDU may reduce preamble overhead of the EHT PPDU, so that whether a PPDU to be detected is an EHT PPDU may be quickly detected.

In one possible embodiment, the method further comprises: and if the PPDU to be detected is not determined as the EHTPPDU or the HE PPDU, determining that the PPDU to be detected is a Non-HT (legacy) PPDU.

In the embodiment of the present application, PPDUs capable of being transmitted on the 6GHz band include HE PPDUs, Non-ht (legacy) PPDUs, and EHT PPDUs. After determining that the PPDU to be detected is HE PPDU, Non-ht (legacy) PPDU or EHTPPDU, when neither the symbol in the preamble of the PPDU to be detected meets the symbol characteristics of the HE PPDU and the EHT PPDU, that is, it is not possible to determine that the PPDU to be detected is HE PPDU nor it is possible to determine that the PPDU to be detected is EHT PPDU, it may be determined that the PPDU to be detected is Non-ht (legacy) PPDU.

In a possible implementation manner, in a preamble format of the EHT PPDU, an L-SIG of the EHT-GF PPDU is modulated by QBPSK, and after determining that the PPDU to be detected is the EHT PPDU or the HE PPDU, the method further includes:

and if the L-SIG of the PPDU to be detected is modulated by QBPSK, determining that the PPDU to be detected is EHT-GFPPDU.

In the embodiment of the present application, since the main channel of the EHT PPDU is set on the 6GHz band and the HT-GF PPDU cannot transmit on the 6GHz band, the EHT PPDU format may multiplex the HT-GF PPDU format as the EHT-GF PPDU. In the case of an EHT PPDU multiplexing HT-GF PPDU format, L-SIG in the EHT-GF PPDU format is QBPSK modulated, while L-SIG in the HEP PDU and Non-HT (legacy) PPDU formats are other modulation types, so the HT-GF PPDU format differs from the HE PPDU and Non-HT (legacy) PPDU formats in that L-SIG is QBPSK modulated. Therefore, in the case that the EHTPPDU multiplexes the HT-GF PPDU format, and after determining that the PPDU to be detected is an HE PPDU, a Non-HT (legacy) PPDU, or an EHT PPDU, whether the PPDU to be detected is an EHT-GF PPDU may be determined by determining whether L-SIG of the PPDU to be detected employs QBPSK modulation.

In one possible embodiment, a data field Date follows the L-SIG of the Non-ht (legacy) PPDU, and after determining that the PPDU to be detected is an EHT PPDU or an HE PPDU, the method further includes:

and if the L-SIG of the PPDU to be detected is Date, determining that the PPDU to be detected is Non-HT (legacy) PPDU.

In the embodiment of the present application, the Non-ht (legacy) PPDU is distinguished from the HE PPDU and the EHT PPDU in that a data field Date is present after L-SIG of the Non-ht (legacy) PPDU, and thus, after determining that the PPDU to be detected is the HE PPDU, the Non-ht (legacy) PPDU or the EHT PPDU, whether the PPDU to be detected is the Non-ht (legacy) PPDU may be quickly determined by determining whether the data field is present after L-SIG of the PPDU to be detected.

In a possible implementation manner, in a preamble format of the EHT PPDU, a first symbol or a second symbol after an L-SIG of the EHT PPDU is modulated by QBPSK, and after determining that the PPDU to be detected is the EHT PPDU or the HE PPDU, the method further includes:

In this embodiment, since the main channel of the EHT PPDU is set on the 6GHz band and the HT PPDU cannot transmit on the 6GHz band, the EHT PPDU format may multiplex the format of the HT PPDU as the EHT PPDU. In case that the EHT PPDU multiplexes an HT PPDU format, the EHT PPDU is different from the HE PPDU and the Non-HT (legacy) PPDU in a format in which a first symbol or a second symbol following an L-SIG of the EHT PPDU is QBPSK modulated. Therefore, in the case where the EHT PPDU may multiplex the HT PPDU format, after determining that the PPDU to be detected is the EHT PPDU, the HE PPDU, or the Non-HT (legacy) PPDU, it may be quickly determined whether the PPDU to be detected is the EHT PPDU by performing the above-described steps.

It can be seen that, in the embodiment of the present application, since the primary channel of the EHT PPDU is set in the 6GHz band, the HT PPDU and the VHT PPDU cannot be associated with the 6GHz band in the existing PPDU except for the HE PPDU or the HE PPDU and the Non-HT (legacy) PPDU. Therefore, when the receiving end detects the PPDU, the PPDU to be detected can be preliminarily distinguished by judging whether the PPDU to be detected is transmitted on the 6GHz frequency band. That is, if the PPDU to be detected is transmitted in the 6GHz band, it may be determined that the PPDU to be detected may be an EHT PPDU or an HE PPDU, or it may be an EHT PPDU, an HE PPDU, or a Non-ht (legacy) PPDU. In addition, the HT PPDU and the VHT PPDU cannot be associated to the 6GHz band, so the EHT PPDU may multiplex formats of the HT PPDU and the VHT PPDU, overhead of a preamble of the EHT PPDU is reduced, and thus the EHT PPDU may be quickly identified through a symbol.

In a second aspect, an embodiment of the present application provides a method for detecting an EHT PPDU, where a frequency band where the EHT PPDU is located is provided with a lowest bandwidth of X MHz, and the method includes:

if the bandwidth of the PPDU to be detected is larger than or equal to X MHz, determining that the PPDU to be detected contains EHT PDU, and then identifying the EHT PPDU by using the symbol of the EHT PPDU.

In this embodiment of the present application, since the lowest bandwidth of the EHT PPDU is X MHz, a receiving end may preliminarily distinguish the type of the PPDU to be detected by determining the bandwidth of the received PPDU to be detected, that is, if the bandwidth of the PPDU to be detected is greater than or equal to X MHz, the PPDU type with the maximum bandwidth smaller than X MHz may be excluded, and it is determined that the PPDU to be detected may include the EHT PPDU, and then it may continue to identify whether the PPDU to be detected is an EHT PPDU according to a symbol of the EHT PPDU.

In a possible embodiment, in a case that the value of X is less than 160 and the bandwidth of the PPDU to be detected is less than or equal to 160MHz, the determining that the PPDU to be detected includes an EHT PPDU includes:

and determining that the PPDU to be detected is VHT PPDU, HE PPDU or EHT PPDU.

In this embodiment of the present application, since the lowest bandwidth of the EHT PPDU is X MHz, after the receiving end determines that the bandwidth of the PPDU to be detected is greater than or equal to X MHz, it may be determined that the PPDU to be detected may be an EHT PPDU. In addition, since the maximum bandwidth of the VHT PPDU is 160MHz, the maximum bandwidth of the HE PPDU is 160MHz, and the value of X is greater than or equal to 80. Therefore, when the value of X is less than 160, it may be determined that the PPDU to be detected is a VHT PPDU, an HE PPDU, or an EHT PPDU by performing the above steps.

In one possible implementation, in the preamble of the EHT PPDU, the first symbol and the second symbol after the L-LTF are not the same in symbol;

the identifying the EHT PPDU using the symbol of the EHT PPDU comprises:

In the embodiment of the present application, since RL-SIG identical to L-STG exists in the frame structure preamble format of the HE PPDU, after determining that the PPDU to be detected is VHT PPDU, Non-ht (legacy) PPDU, EHT PPDU, or HE PPDU, and in a case that EHT does not multiplex the format of the HE PDPU, that is, in a case that RL-SIG does not exist in the format of the EHT PPDU, whether the PPDU to be detected is the HE PPDU may be determined by determining whether a first symbol (corresponding to L-SIG) and a second symbol (corresponding to RL-SIG) after L-LTF in the PPDU to be detected are identical.

In a possible implementation manner, if a first symbol after L-SIG of the PPDU to be detected adopts BPSK modulation and a second symbol adopts QBPSK modulation, it is determined that the PPDU to be detected is a VHT PPDU.

In the embodiment of the present application, in the case that the EHT PPDU does not multiplex the formats of the VHT PPDU and the HE PPDU, the VHT PPDU is different from the Non-ht (legacy) PPDU, the EHT PPDU, or the HE PPDU in that a first symbol is BPSK modulated after L-SIG of the VHT PPDU and a second symbol is QBPSK modulated. Therefore, after determining that the PPDU to be detected is VHTPPDU, Non-ht (legacy) PPDU, EHT PPDU or HE PPDU, determining that the PPDU to be detected is VHTPPDU may be determined by determining that a first symbol after L-SIG of the PPDU to be detected is BPSK modulated and a second symbol after L-SIG of the PPDU to be detected is QBPSK modulated.

In a possible implementation manner, in the preamble format of the EHT PPDU, a first symbol after an EHT-LTF of the EHT-GF PPDU is modulated by QBPSK; the identifying the EHT PPDU using the symbol of the EHT PPDU comprises:

In the embodiment of the present application, since the format of HT-GF PPDU is different from VHT PPDU, HE PPDU and Non-HT (legacy) PPDU, the first symbol after LTF is QBPSK modulated. Therefore, in the case that the EHT PPDU multiplexes the HT-GF PPDU format, after determining that the PPDU to be detected is a VHT PPDU, an HE PPDU, a Non-HT (legacy) PPDU, or an EHT PPDU, it may be determined whether the PPDU to be detected is an EHT-GF PPDU by determining whether a first symbol after LTF of the PPDU to be detected employs QBPSK modulation.

EHT-GF-STF、EHT-LTF、EHT-SIG1QBPSK、EHT-SIG2QBPSK。

in the embodiment of the application, the lowest bandwidth of the EHT PPDU is X MHz, X is greater than or equal to 80, and the maximum bandwidth of the HT-GF PPDU is less than 80, so the EHT PPDU can multiplex the format of the HT-GF PPDU as the EHT-GF PPDU, and the EHT-GF PPDU format can reduce the overhead of the preamble of the EHT PPDU, thereby rapidly detecting whether the PPDU to be detected is the EHT-GF PPDU.

In a possible implementation manner, in the preamble format of the EHT PPDU, a first symbol after an L-SIG of the EHT-MF PPDU is modulated by QBPSK; the identifying the EHT PPDU using the symbol of the EHT PPDU comprises:

and if the first symbol behind the L-SIG of the PPDU to be detected is modulated by QBPSK, determining that the PPDU to be detected is EHT-MF PPDU.

In the embodiment of the present application, since the lowest bandwidth of the EHT PPDU is X MHz, X is greater than or equal to 80, and the maximum bandwidth of the HT-MFPPDU is less than 80, the EHT pdu may multiplex the format of the HT-MF PPDU as the EHT-MF PPDU. In case of the EHTPPDU multiplexing HT-MF PPDU format, the formats of the EHT-MF PPDU and HE PPDU, VHT PPDU, and Non-HT (legacy) PPDU are different in that a first symbol after L-SIG of the EHT-MF PPDU is QBPSK modulated. Therefore, after determining that the PPDU to be detected is VHT PPDU, EHT PPDU, HE PPDU or Non-HT (legacy) PPDU, whether the first symbol after L-SIG of the PPDU to be detected is modulated by QBPSK can be judged, and the PPDU to be detected is EHT-MF PPDU can be determined.

In a possible implementation manner, the preamble format of the EHT-MF PPDU sequentially includes: L-STF, L-LTF, L-SIG BPSK, EHT-SIG1-QBPSK, EHT-SIG 2-QBPSK.

In the embodiment of the application, as the lowest bandwidth of the EHT PPDU is X MHz, X is greater than or equal to 80, and the maximum bandwidth of the HT-MFPPDU is less than 80, the EHT PPDU may multiplex a format of the HT-MF PPDU as the EHT-MF PPDU, and the format of the HT-MF PPDU may reduce preamble overhead of the EHT PPDU, so that whether the PPDU to be detected is the EHT PPDU may be quickly detected.

It can be seen that in the embodiment of the present application, since the lowest bandwidth of the EHT PPDU is X MHz, X is greater than or equal to 80. Therefore, when the receiving end detects the PPDU, it may be initially determined whether the PPDU to be detected includes the EHT PPDU by determining whether the bandwidth of the PPDU to be detected is greater than or equal to X MHz, that is, if the bandwidth of the PPDU to be detected is greater than or equal to X MHz, it may be determined that the PPDU to be detected may be the EHT PPDU. And then further setting a frame structure format of the EHT PPDU (for example, a format of multiplexing the HT PPDU) according to a relationship between a maximum bandwidth of the currently existing PPDU and X, and specifically determining whether the PPDU to be detected is the EHT PPDU according to a symbol of the EHT PPDU. Therefore, according to the embodiment of the application, the overhead of the preamble of the EHT PPDU can be reduced, and the EHT PPDU can be quickly identified through the bandwidth and the symbol.

In a third aspect, an embodiment of the present application provides a method for detecting an EHT PPDU, where a main channel of the EHT PPDU is set in a 6GHz frequency band; the method comprises the following steps:

if the physical layer protocol data unit PPDU to be detected is transmitted on the 6GHz frequency band, determining that the PPDU to be detected contains the EHT PPDU, and then identifying the EHT PPDU by using the symbol of the EHT PPDU.

In a possible embodiment, in the preamble of the EHT PPDU, each symbol in the preamble format of the EHT-GF PPDU is, in order: EHT-GF-STF, EHT-LTF, EHT-SIG1QBPSK, EHT-SIG2 QBPSK;

in the preamble of the EHT PPDU, each symbol in the preamble format of the EHT-MF PPDU is as follows in sequence: L-STF, L-LTF, L-SIG BPSK, EHT-SIG1-QBPSK, EHT-SIG 2-QBPSK;

In one possible embodiment, the method further comprises:

if the symbols of the first symbol and the second symbol after the L-LTF are the same, determining that the PPDU to be detected is an HE PPDU;

or if the first symbol after the LTF of the PPDU to be detected is modulated by QBPSK, determining that the EHTPPDU is an EHT-GF PPDU;

or if the type of the EHT PPDU of the PPDU to be detected is not identified, and the PPDU to be detected is not determined as the HE PPDU, determining that the PPDU to be detected is a Non-HT (legacy) PPDU;

or if the L-SIG of the PPDU to be detected adopts QBPSK, determining that the PPDU to be detected is EHT-GFPPDU;

or if the L-SIG of the PPDU to be detected is Date, determining that the PPDU to be detected is Non-HT (legacy) PPDU.

In a fourth aspect, an embodiment of the present application provides a method for detecting an EHT PPDU, where a frequency band where the EHT PPDU is located is provided with a lowest bandwidth of X MHz, and the method includes:

in the preamble of the EHT PPDU, each symbol in the preamble format of the EHT-MF PPDU is as follows in sequence: L-STF, L-LTF, L-SIG BPSK, EHT-SIG1-QBPSK, EHT-SIG 2-QBPSK.

In this embodiment of the present application, since the lowest bandwidth of the EHT PPDU is X MHz, X is greater than or equal to 80, and the maximum bandwidth of the HT-GFPPDU is less than 80, the EHT PPDU may multiplex a format of the HT PPDU, and the format of multiplexing the HT PPDU may reduce preamble overhead of the EHT PPDU, so that whether the PPDU to be detected is the EHT PPDU may be quickly detected.

In one possible embodiment, the method further comprises:

In a fifth aspect, an embodiment of the present application provides an EHT PPDU detection apparatus, where a main channel of the EHT PPDU is set in a 6GHz frequency band, the apparatus includes:

the frequency judging unit is used for judging whether the PPDU to be detected is transmitted on a 6GHz frequency band or not;

the determining unit is used for determining that the PPDU to be detected contains an EHT PPDU under the condition that the frequency judging unit judges that the PPDU to be detected contains the EHT PPDU;

an identification unit configured to identify an EHT PPDU using a symbol of the EHT PPDU.

In a possible embodiment, the determining unit is configured to determine that the PPDU to be detected is an EHT PPDU, an HE PPDU, or a Non-high throughput physical layer protocol data unit Non-ht (legacy) PPDU; or determining that the PPDU to be detected is an EHT PPDU or HE PPDU.

and the identification unit is used for determining that the PPDU to be detected is an HE PPDU if the symbols of the first symbol and the second symbol after the L-LTF are the same.

In a possible implementation manner, in the preamble format of the EHT PPDU, a first symbol after an EHT-LTF of the EHT-GF PPDU is modulated by using a rotating binary phase shift keying QBPSK;

the identification unit is configured to determine that the EHT PPDU is an EHT-GFPPDU if a first symbol after the LTF of the PPDU to be detected is modulated by QBPSK.

EHT-GF-STF、EHT-LTF、EHT-SIG1QBPSK、EHT-SIG2QBPSK。

in one possible embodiment, in the preamble format of the EHT PPDU, a first symbol or a second symbol after an L-SIG of the EHT PPDU is QBPSK modulated;

the identification unit is configured to determine that the PPDU to be detected is an EHT PPDU if a first symbol or a second symbol after the L-SIG of the PPDU to be detected is modulated by QBPSK.

In a possible embodiment, the identification unit is further configured to determine that the PPDU to be detected is a Non-ht (legacy) PPDU if the PPDU to be detected is not determined to be an EHT PPDU or the PPDU to be detected is not determined to be an HE PPDU.

In a possible implementation manner, in the preamble format of the EHT PPDU, the L-SIG of the EHT-GF PPDU is modulated by QBPSK;

the identification unit is further configured to determine that the PPDU to be detected is an EHT-GF PPDU if the L-SIG of the PPDU to be detected is modulated by QBPSK.

In one possible embodiment, the L-SIG of the Non-HT (legacy) PPDU is followed by a data field Date;

the identification unit is configured to determine that the PPDU to be detected is a Non-ht (legacy) PPDU if the L-SIG rear of the PPDU to be detected is Date.

In a sixth aspect, an embodiment of the present application provides another EHT PPDU detection apparatus, where a frequency band where an EHT PPDU is located is provided with a lowest bandwidth of X MHz, and X is greater than or equal to 80, the apparatus includes:

a bandwidth judging unit, configured to judge whether a bandwidth of the PPDU to be detected is greater than or equal to X MHz;

a determining unit, configured to determine that the PPDU to be detected includes an EHT PPDU if the bandwidth determining unit determines that the PPDU to be detected includes the EHT PPDU;

In a possible implementation manner, the determining unit is configured to determine that the PPDU to be detected is a VHT PPDU, an HE PPDU, or an EHTPPDU, when the value of X is less than 160 and the bandwidth of the PPDU to be detected is less than or equal to 160 MHz.

In a possible implementation manner, in the preamble format of the EHT PPDU, a first symbol after an LTF of the EHT-GF PPDU is modulated by QBPSK; the identifying the EHT PPDU using the symbol of the EHT PPDU comprises:

EHT-GF-STF、EHT-LTF、EHT-SIG1QBPSK、EHT-SIG2QBPSK。

in a possible implementation manner, in the preamble format of the EHT PPDU, a first symbol after an L-SIG of the EHT-MF PPDU is modulated by QBPSK; and the identification unit is used for determining that the PPDU to be detected is EHT-MF PPDU if a first symbol behind the L-SIG of the PPDU to be detected is modulated by QBPSK.

In a seventh aspect, an embodiment of the present application provides an EHT PPDU detection apparatus, including: a processor and a memory, the processor executing code in the memory to perform the EHT PPDU detection method as described in any one of the above first aspect or the first aspect, and any one of the second aspect or the second aspect.

In an eighth aspect, an embodiment of the present application provides a computer non-transitory storage medium, including instructions that, when running on an EHT PPDU detection device, cause the EHT PPDU detection device to perform the EHT PPDU detection method described in any one of the above first aspect or the first aspect, and any one of the second aspect or the second aspect.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments or the background art of the present application, the drawings required to be used in the embodiments or the background art of the present application will be described below.

Fig. 1 is a schematic diagram of an architecture of a wireless local area network system according to an embodiment of the present application;

fig. 2 is a schematic structural diagram of an AP and STA product provided in an embodiment of the present application;

fig. 3 is a schematic diagram of an internal structure of an AP and an STA according to an embodiment of the present disclosure;

fig. 4 is a schematic diagram of a detection method of HT PPDU and VHT PPDU provided in an embodiment of the present application;

fig. 5 is a schematic flow chart of a detection method of an EHT PPDU according to an embodiment of the present application;

fig. 6 is a schematic flow chart of another EHT PPDU detection method according to an embodiment of the present application;

fig. 7 is a schematic flow chart of another detection method of an EHT PPDU according to an embodiment of the present application;

fig. 8 is a schematic flow chart of another detection method for an EHT PPDU according to an embodiment of the present application;

fig. 9 is a schematic flow chart of another detection method of an EHT PPDU according to an embodiment of the present application;

fig. 10 is a schematic flow chart of another detection method of an EHT PPDU according to an embodiment of the present application;

fig. 11 is a schematic structural diagram of an EHT PPDU detection apparatus according to an embodiment provided in the present application;

fig. 12 is a schematic structural view of an EHT PPDU detection apparatus according to another embodiment provided in the present application;

fig. 13 is a schematic structural diagram of an EHT PPDU detection apparatus according to another embodiment provided in the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Referring to fig. 1, fig. 1 is a schematic diagram of an architecture of a wireless local area network system according to an embodiment of the present application. The present disclosure relates to data communication between an Access Point (AP) and one or more Stations (STAs), and data communication between the AP and the AP. In this embodiment of the present application, the data receiving end may be an AP or an STA, and after receiving the PPDU packet, the data receiving end needs to detect the received PPDU packet to determine which wireless communication protocol the PPDU follows. Wherein, the wireless communication protocol comprises the existing IEEE802.11 wireless communication protocol; e.g., 802.11n, 802.11ac, 802.11 ax; next generation wireless communication protocols are also included. The AP and STA involved in the present solution include, but are not limited to, a communication server, a router, a switch, a bridge, a computer, a mobile phone, etc. Particularly APs and STAs supporting the 802.11 standard. It will be appreciated that the solution of the present application may also be extended to cellular networks.

Fig. 2 is a schematic diagram illustrating a structure of AP and STA products according to an embodiment of the present disclosure. The 802.11 standard focuses on the 802.11 physical layer (PHY) and Medium Access Control (MAC) part, and the technical solution of the present application is also a protocol design on the MAC and PHY. The STA product is generally an end product supporting MAC and PHY of 802.11, such as a mobile phone, a notebook computer, etc., fig. 2 only shows an AP with multiple antennas and an STA structure diagram with a single antenna, and in an actual scenario, both the AP and the STA may be multiple antennas and may be devices with more than two antennas.

Specifically, referring to fig. 3, fig. 3 is a schematic diagram of an internal structure of an AP and an STA provided in the embodiment of the present application. As shown in the figure, the AP and the STA each include a radio frequency antenna, a physical layer PHY baseband module, a media access control MAC layer module, a Logical Link Control (LLC) module, an upper layer interface, an IP processing module, a Transmission Control Protocol (TCP)/User Datagram Protocol (UDP) processing module, and an application layer module. The scheme of the application mainly relates to the fact that the physical layer PHY baseband module detects that the received PPDU conforms to the generation of wireless local area network protocol through the lead code of the PPDU.

Starting with the 802.11n protocol operating in the 2.4GHz band, the supported transmission bandwidth extends from 20MHz to 40 MHz. The frame structure of the 802.11n PPDU (i.e., denoted by HT PPDU) is shown in table 1 and includes a legacy preamble (L-STF, L-LTF, and L-SIG), a high throughput signaling field (HT-SIG), a high throughput short training field (HT-STF), a high throughput long training field (HT-LTF), and a Data (Data) field. Where HT-SIG includes 2 Orthogonal Frequency Division Multiplexing (OFDM) symbols, each symbol being 4us in duration, it is noted that reference to an HT PPDU herein refers to a mixed Mode (MF) PPDU in 802.11n rather than a green mode (GF) PPDU.

TABLE 1 frame Structure of HT PPDU

L-STF

L-LTF

L-SIG

HT-SIG

HT-STF

HT-LTF

Date

The 802.11ac supports the maximum bandwidth to be expanded from 40MHz to 160MHz due to the introduction of a new 5GHz frequency band. More twiddle factors are needed to reduce the legacy preamble and other fields of the duplicated transmission at multiple 20 MHz. The PPDU (i.e., VHT PPDU representation) frame structure of 802.11ac is shown in table 2 and includes a legacy preamble, as well as very high throughput field a (VHT-SIG-a), very high throughput short training field (VHT-STF), very high throughput long training field (VHT-LTF), very high throughput field B (VHT-SIG-B), and Data (Data) field, where VHT-SIG contains 2 OFDM symbols each with a duration of 4 us.

TABLE 2 VHT PPDU frame Structure

L-STF

L-LTF

L-SIG

VHT-SIG-A

VHT-STF

VHT-LTF

VHT-SIG-B

Date

802.11ax introduces new features such as OFDMA, as shown in table 3, there are new changes to the structure of the preamble of 802.11ax PPDU (i.e. denoted by HE PPDU), including legacy preamble, and repeated legacy signaling field (RL-SIG), high efficiency signaling field a (HE-SIG-a), high efficiency signaling field B (HE-SIG-B), high efficiency short training sequence (HE-STF), high efficiency long training sequence field (HE-LTF), and data field (data) fields.

TABLE 3 frame Structure of HE PPDU

L-STF

L-LTF

L-SIG

RL-SIG

HE-SIG-A

HE-SIG-B

HE-STF

HE-LTF

Date

The 802.11a PPDU is the earliest WiFi generation protocol and its PPDU structure contains only legacy preambles (L-STF, L-LTF, L-SIG) and data fields, and no other preamble fields. Therefore, the PPDU does not carry information for automatically detecting that the PPDU is a PPDU of 802.11 a. The preambles of the 802.11n and 802.11ac PPDUs carry information that automatically detects that their PPDUs are 802.11n HT PPDUs and 802.11ac VHT PPDUs, respectively.

Referring to fig. 4, fig. 4 is a method for automatically detecting HT PPDU and VHT PPDU, which is specifically as follows:

and 2 symbols of HT-SIG of the HT PPDU are all modulated by rotating binary phase shift keying QBPSK, and are coded by a binary convolutional code with the code rate of 0.5. This QBPSK modulation is equivalent to rotating the BPSK symbols by 90 degrees so that the information carried by the I axis is transferred to the Q axis. The receiving end compares the energy of the Q axis and the I axis, and determines that the received PPDU is an 802.11n PPDU (i.e., an HT PPDU) when the energy difference is greater than a threshold value. The 802.11ac adopts a similar method, and the first symbol of the VHT-SIG-a is modulated by Binary Phase Shift Keying (BPSK), and the second symbol is modulated by QBPSK. The receiving end can judge through the energy difference between the Q axis and the I axis of the 2 symbols, and when the energy difference between the Q axis and the I axis of the first symbol is smaller than a threshold value and the energy difference between the Q axis and the I axis of the second symbol is larger than the threshold value, judge that the received PPDU is a PPDU of 802.11ac (i.e., a VHT PPDU).

802.11ax to distinguish between existing 802.11n and 802.11ac frames, it is proposed that the new generation preamble contains a repeated legacy signaling field RL-SIG, which carries the same data per subcarrier in the RL-SIG frequency domain as the L-SIG field. The receiving end judges whether the received PPDU is an HE PPDU or not by comparing whether the L-SIG and the RL-SIG are the same or not, the specific judgment methods are various, and the protocol is not specifically specified, for example, the similarity of each subcarrier in a frequency domain is compared, or the similarity of values of sampling points in time is compared to be larger than a certain threshold value, the received PPDU is judged to be an 802.11ax PPDU (namely, the HE PPDU), otherwise, the received PPDU is judged to be a non-HE PPDU. Another function of RL-SIG is to improve robustness in outdoor scenarios, since L-SIG is transmitted repeatedly, theoretically with a Packet Error Rate (PER) of 3dB performance.

In addition, before 802.11ax, L-SIG in PPDU including 802.11a, 802.11n and 802.11ac PPDU preambles has 64 subcarriers including the middle 1 dc subcarrier, 2 sides of the dc subcarrier having 52 subcarriers used, and the left 7 and right 6 sideband subcarriers. Where the 52 sub-carriers used comprise 48 sub-carriers carrying data and 4 sub-carriers carrying pilot signals, the pilot signals are not interleaved. In 802.11ax, 2 sideband subcarriers are used, i.e., there are 56 subcarriers used in the L-SIG field, including 4 pilot subcarriers, 48 data subcarriers, and 4 newly introduced subcarriers carrying known data [1-1-1-1] in 802.11 ax. The RL-SIG field contains 56 used subcarriers as the L-SIG field, and carries the same signal as the L-SIG field.

For PPDUs transmitted by IEEE802.11 ax next generation WiFi-very high throughput protocol, EHT PPDUs (also referred to as PPDUs of other names) lack a self-detection identification method, which can help a receiving end to determine whether a received PPDU is an EHT PPDU, and does not determine other existing PPDUs as EHT PPDUs, where the existing PPDUs include 802.11a PPDUs, 802.11n HT PPDUs, 802.11ac VHT PPDUs, 802.11ax HEPPDU, and so on. Wherein, the main channel of the EHT PPDU is arranged in a 6GHz frequency band.

It can be understood that, in the embodiment of the present application, the EHT PPDU may not only transmit only on the 6GHz band, but also jointly transmit across the bands, that is, multi-band aggregation operation. When the EHT PPDU is transmitted simultaneously across frequency bands, the main channel must be set at 6GHz for transmission. The patterns of possible combinations are for example: the 2.4GHz and 6GHz bands are transmitted together across the band, the 5GHz and 6GHz bands are transmitted together across the band, or another band is transmitted together with the 6GHz band, but the main channel must be set on the 6GHz band. In addition, in the case of multiband aggregation operation, the PPDU of 802.11n cannot operate on 2.4/5GHz and 6GHz bands.

Referring to fig. 5, fig. 5 is a schematic flowchart of a detection method for an EHT PPDU according to an embodiment of the present application, in which a main channel of the EHT PPDU is set on a 6GHz frequency band, and the detection method for the EHT PPDU includes, but is not limited to, the following steps.

501: and the receiving end judges whether the PPDU to be detected is transmitted on the 6GHz frequency band.

In the embodiment of the present application, it is assumed that Non-ht (legacy) PPDU cannot transmit in the 6GHz band. In addition, because the main channel of the EHT PPDU is set on the 6GHz band, and WiFi products below 802.11ax are not allowed to be associated on the 6GHz band, that is, none of the HT PPDU, the VHT PPDU, and the like can transmit data on the 6GHz band, the preamble format of the frame structure of the EHT PPDU may multiplex the preamble formats of the frame structures of the HT PPDU and the VHT PPDU, but cannot multiplex the preamble format of the HE PPDU, that is, there is no RL-SIG identical to L-SIG after L-SIG in the preamble format of the EHT PPDU.

As shown in table 4, table 4 is a schematic diagram of an EHT-GF PPDU frame structure provided in this application. The EHT-GFPPDU frame structure is a multiplexed HT-GF PPDU format; the EHT-GF PPDU frame structure comprises: an EHT-high-throughput short-training field (EHT-high-GF-STF), an EHT-low-training field (EHT-low-LTF), an EHT-high-throughput signaling field 1(EHT-signaling field 1QBPSK, EHT-SIG1QBPSK), and an EHT-signaling field 2(EHT-signaling field 2QBPSK, EHT-SIG1 QBPSK). The EHT-SIG1QBPSK comprises 2 OFDM symbols, and the duration of each symbol is 4 us.

TABLE 4 frame Structure of EHT-GF PPDU

As shown in table 5, table 5 is a schematic diagram of a frame structure of an EHT-MF PPDU provided in this application. The EHT-MFPPDU frame structure is a multiplexed HT-MF PPDU format; the frame structure of the EHT-MF PPDU comprises a traditional lead code (L-STF, L-LTF and L-SIGBPSK), and an extremely high throughput signaling field 1(EHT-signaling field 1QBPSK, EHT-SIG1QBPSK) and an extremely high throughput signaling field 2(EHT-signaling field 2QBPSK, EHT-SIG1 QBPSK). The EHT-SIG1QBPSK comprises 2 OFDM symbols, and the duration of each symbol is 4 us.

TABLE 5 frame Structure of EHT-MF PPDU

As shown in table 6, table 6 is a schematic diagram of a frame structure of an EHT-MF PPDU provided in the present application. The EHT PPDU frame structure is a format of a multiplexed VHT PPDU; the EHT PPDU frame structure comprises a traditional lead code (L-STF, L-LTF and L-SIG BPSK), and an extremely high throughput signaling field 1(EHT-signaling field 1BPSK, EHT-SIG1BPSK) and an extremely high throughput signaling field 2(EHT-signaling field 2QBPSK, EHT-SIG1 QBPSK). The HT-SIG1QBPSK comprises 2 OFDM symbols, and the duration of each symbol is 4 us.

TABLE 6 frame structure of EHT PPDU

It is understood that, in the embodiment of the present application, the frame structure preamble format of the EHT PPDU may be other formats different from the HE PPDU in addition to the three formats of multiplexing the existing HT-GF PPDU, HT-MF PPFU and VHT PPDU in the above tables 4 to 6, and the embodiment of the present application is not limited.

In this embodiment of the present application, a PPDU to be detected may be preliminarily distinguished through an operation frequency band of a channel, that is, when it is determined that the PPDU to be detected is transmitted in a 6GHz frequency band, it may be determined that the PPDU to be detected is a PPDU that can be transmitted in the 6GHz frequency band, that is, may include an EHT PPDU, and whether the PPDU is an EHT PPDU specifically needs to be further determined; in addition, the condition that the PPDU to be detected is a PPDU not transmitted on the 6GHz band, such as HT PPDU, VHTPPDU, etc., can be excluded. The receiving end may be an access point AP or a station STA.

Specifically, after the receiving end receives the PPDU to be detected, it is determined whether the PPDU to be detected is transmitted in the 6GHz band. If the PPDU to be detected is transmitted on the 6GHz frequency band, determining that the PPDU to be detected may be an HT PPDU, a VHTPPDU or an HE PPDU, and further judging which PPDU the PPDU to be detected belongs to according to a method shown in the figure; if the PPDU to be detected is transmitted in the 6GHz band, step 502 is executed to further determine whether the PPDU to be detected is an EHTPPDU.

502: and under the condition that the PPDU to be detected is transmitted on the 6GHz frequency band, the receiving end determines that the PPDU to be detected contains the EHT PPDU, and then the symbol of the EHT PPDU is used for identifying the PPDU to be detected.

In this embodiment of the present application, because only two types of PPDUs, namely, an HE PPDU and an EHT PPDU, operate on a 6GHz band, when it is determined that the receiving end operates on the 6GHz band, it may be determined that the PPDU to be detected is an EHTPPDU or an HE PPDU. It is understood that, when it is determined that the PPDU to be detected is transmitted on the 6GHz band, the PPDU to be detected may not be the HE PPDU or the EHT PPDU, but may be both. Specifically, it is further required to accurately determine which PPDU to which the PPDU to be detected belongs according to the symbol in the preamble of the PPDU to be detected.

In the embodiment of the present application, it can be found by comparing tables 4 to 6, that when the PPDU to be detected is preliminarily distinguished according to the operating frequency band, the reusable format of the EHT PPDU and the format of the HE PPDU are different in that QBPSK modulation is adopted for the first symbol or the second symbol after the L-SIG. Therefore, whether the PPDU to be detected is the EHT PPDU or not can be judged according to whether the first symbol or the second symbol after the L-SIG of the PPDU to be detected adopts QBPSK modulation or not. In addition, since the L-SIG and the RL-SIG are the same in the preamble format of the HEPPDU, it can be determined whether the first symbol and the second symbol after the L-LTF in the PPDU to be detected are the same to determine whether the PPDU to be detected is the HE PPDU.

As an optional implementation manner, the further accurately determining which PPDU to which the PPDU to be detected belongs according to the symbol in the preamble of the PPDU to be detected specifically may include: judging whether a first symbol and a second symbol after the L-LTF in the PPDU to be detected are the same or not, and if the first symbol and the second symbol after the L-LTF in the PPDU to be detected are the same, determining that the PPDU to be detected is an HE PPDU; if the first symbol and the second symbol after the L-LTF in the PPDU to be detected are different, further judging whether the first symbol or the second symbol after the L-SIG in the PPDU to be detected adopts QBPSK modulation, if the first symbol or the second symbol after the L-SIG in the PPDU to be detected adopts QBPSK modulation, determining that the PPDU to be detected is an EHT PPDU, and if the first symbol or the second symbol after the L-SIG in the PPDU to be detected does not adopt QBPSK modulation, determining that the PPDU to be detected is neither an HE PPDU nor an EHT PPDU.

Furthermore, in the case that the first symbol or the second symbol after the L-SIG in the PPDU to be detected is modulated by QBPSK, if the first symbol after the L-SIG in the PPDU to be detected is modulated by QBPSK, it is determined that the PPDU to be detected is an EHT-MF PPDU.

In the embodiment of the present application, comparing the EHT-GF PPDU in table 4 with the EHT-MF PPDU in table 5, the EHT PPDU in table 6 and table 6, and the HE PPDU in table 3, it can be found that the first symbol after the EHT-LTF in the EHT-GF PPDU is QBPSK modulated, and the first symbol after the LTF of the EHT-MF PPDU, the EHT PPDU, and the HE PPDU is BPSK modulated. Therefore, after the PPDU to be detected is transmitted on the 6GHz frequency band, whether the first symbol after the LTF of the PPDU to be detected adopts QBPSK modulation can be quickly judged to be the EHT-GFPPDU.

As an optional implementation manner, the further accurately determining which PPDU to which the PPDU to be detected belongs according to the symbol in the preamble of the PPDU to be detected specifically may include: judging whether a first symbol after LTF in the PPDU to be detected adopts QBPSK modulation or not; if so, determining that the PPDU to be detected is an EHT-GF PPDU; if not, judging whether a first symbol and a second symbol after the L-LTF in the PPDU to be detected are the same, and if the first symbol and the second symbol after the L-LTF in the PPDU to be detected are the same, determining that the PPDU to be detected is an HE PPDU; if the first symbol and the second symbol after the L-LTF in the PPDU to be detected are different, further judging whether the first symbol or the second symbol after the L-SIG in the PPDU to be detected adopts QBPSK modulation, if the first symbol or the second symbol after the L-SIG in the PPDU to be detected does not adopt QBPSK modulation, determining that the PPDU to be detected is neither HE PPDU nor EHTPPDU, and if the first symbol or the second symbol after the L-SIG in the PPDU to be detected adopts QBPSK modulation, determining that the PPDU to be detected is EHT PPDU. Furthermore, in the case that the first symbol or the second symbol after the L-SIG in the PPDU to be detected is modulated by QBPSK, if the first symbol after the L-SIG in the PPDU to be detected is modulated by QBPSK, it is determined that the PPDU to be detected is an EHT-MF PPDU.

It can be seen that, in the embodiment of the present application, since the primary channel of the EHT PPDU is set in the 6GHz band, the HT PPDU and the VHT PPDU cannot be associated with the 6GHz band in addition to the HE PPDU in the existing PPDU. Therefore, when the receiving end detects the PPDU, the PPDU to be detected can be preliminarily distinguished by judging whether the PPDU to be detected is transmitted on the 6GHz frequency band. That is, if the PPDU to be detected is transmitted in the 6GHz band, it may be determined that the PPDU to be detected may be an EHT PPDU or an HE PPDU. In addition, the HT PPDU and the VHT PPDU cannot be associated to the 6GHz band, so the EHT PPDU may multiplex formats of the HT PPDU and the VHT PPDU, overhead of a preamble of the EHT PPDU is reduced, and thus the EHT pdu may be quickly identified through a symbol.

Consistent with the detection method of the EHT PPDU shown in fig. 5, referring to fig. 6, fig. 6 is a schematic flow chart of another detection method of the EHT PPDU provided by the embodiment of the present application, and the detection method of the EHT PPDU includes, but is not limited to, the following steps.

601: and the receiving end judges whether the PPDU to be detected is transmitted on the 6GHz frequency band.

In this embodiment of the present application, if the receiving end determines that the PPDU to be detected is transmitted in the 6GHz band, which indicates that the PPDU to be detected may be an EHT PPDU or an HE PPDU, the step 602 continues to be performed; if the receiving end determines that the PPDU to be detected is not transmitted on the 6GHz band, which indicates that the PPDU to be detected may be an HT PPDU or a VHE PPDU, the step 605 is continuously performed.

602: and under the condition that the receiving end determines that the PPDU to be detected is transmitted on the 6GHz frequency band, the receiving end determines that the PPDU to be detected is an EHT PPDU or an HE PPDU.

In this embodiment of the application, after the receiving end determines that the PPDU to be detected is an EHT PPDU or an HE PPDU, the receiving end may continue to perform

step

603 or 604, that is, the execution sequence of step 603 and step 604 may be exchanged.

603: and the receiving end judges whether the first symbol and the second symbol after the L-LTF in the PPDU to be detected are the same.

In this embodiment, after the receiving end determines that the PPDU to be detected is an EHT PPDU or an HE PPDU, it may be determined whether the PPDU to be detected is an HE PPDU by determining whether a first symbol and a second symbol after an L-LTF in the PPDU to be detected are the same. Specifically, if the receiving end judges that the first symbol and the second symbol after the L-LTF in the PPDU to be detected are the same, the PPDU to be detected is determined to be the HE PPDU.

604: and judging whether the first symbol or the second symbol after the L-SIG in the PPDU to be detected adopts QBPSK modulation.

In this embodiment, after a receiving end determines that the PPDU to be detected is an EHT PPDU or an HE PPDU, whether the PPDU to be detected is the EHT PPDU may be determined by whether a first symbol or a second symbol after an L-SIG symbol in the PPDU to be detected employs QBPSK modulation. Specifically, if the QBPSK modulation is adopted in the first symbol or the second symbol after the L-SIG in the PPDU to be detected at the receiving end, it is determined that the PPDU to be detected is an EHT PPDU. Furthermore, in the case that the first symbol or the second symbol after the L-SIG in the PPDU to be detected is modulated by QBPSK, if the first symbol after the L-SIG in the PPDU to be detected is modulated by QBPSK, it is determined that the PPDU to be detected is an EHT-MFPPDU.

605: and under the condition that the receiving end determines that the PPDU to be detected is not transmitted on the 6GHz frequency band, the receiving end determines that the PPDU to be detected is an HT PPDU or a VHT PPDU.

In this embodiment, when a receiving end determines that a PPDU to be detected is not transmitted on a 6GHz band, it determines that the PPDU to be detected is an HT PPDU, a VHT PPDU, an HE PPDU, or a Non-HT (legacy) PPDU, and then may determine that the PPDU to be detected is one of the HT PPDU, the VHT PPDU, or the Non-HT (legacy) PPDU by using the method described in fig. 4, and if the PPDU to be detected is neither an HT PPDU nor a VHT PPDU nor a Non-HT (legacy) PPDU, it determines that the PPDU to be detected is an HE PPDU.

Consistent with the detection method of the EHT PPDU shown in fig. 5, referring to fig. 7, fig. 7 is a schematic flow chart of another detection method of the EHT PPDU provided by the embodiment of the present application, and the detection method of the EHT PPDU includes, but is not limited to, the following steps.

701: and the receiving end judges whether the PPDU to be detected is transmitted on the 6GHz frequency band.

In this embodiment of the present application, if the receiving end determines that the PPDU to be detected is transmitted in the 6GHz band, which indicates that the PPDU to be detected may be an EHT PPDU or an HE PPDU, the step 702 continues to be performed; if the receiving end determines that the PPDU to be detected is not transmitted on the 6GHz band, which indicates that the PPDU to be detected may be an HT PPDU or a VHE PPDU, the step 706 is continuously performed.

702: and under the condition that the receiving end determines that the PPDU to be detected is transmitted on the 6GHz frequency band, the receiving end determines that the PPDU to be detected is an EHT PPDU or an HE PPDU.

In this embodiment, after the receiving end determines that the PPDU to be detected is an EHT PPDU or an HE PPDU, the receiving end may continue to execute step 703.

703: and the receiving end judges whether the first symbol after the LTF in the PPDU to be detected adopts QBPSK modulation or not.

In the embodiment of the application, the first symbol after the EHT-LTF in the EHT-GF PPDU is modulated by QBPSK, and the first symbol after the L-LTF in the EHT-MF PPDU, the EHT PPDU and the HE PPDU is modulated by BPSK. Therefore, after the PPDU to be detected is transmitted on the 6GHz frequency band, whether the first symbol after the LTF of the PPDU to be detected is modulated by QBPSK can be used for quickly judging that the PPDU to be detected is the EHT-GF PPDU.

Specifically, when the receiving end determines that the first symbol after the LTF of the PPDU to be detected adopts QBPSK modulation, it is determined that the PPDU to be detected is an EHT-GF PPDU.

704: and the receiving end judges whether the first symbol and the second symbol after the L-LTF in the PPDU to be detected are the same.

705: and judging whether the first symbol or the second symbol after the L-SIG in the PPDU to be detected adopts QBPSK modulation.

In this embodiment, after a receiving end determines that the PPDU to be detected is an EHT PPDU or an HE PPDU, whether the PPDU to be detected is the EHT PPDU may be determined by whether a first symbol or a second symbol after an L-SIG symbol in the PPDU to be detected employs QBPSK modulation. Specifically, if a receiving end uses QBPSK modulation for a first symbol or a second symbol after L-SIG in the PPDU to be detected, it is determined that the PPDU to be detected is an EHT PPDU. Furthermore, in the case that the first symbol or the second symbol after the L-SIG in the PPDU to be detected is modulated by QBPSK, if the first symbol after the L-SIG in the PPDU to be detected is modulated by QBPSK, it is determined that the PPDU to be detected is an EHT-MF PPDU.

706: and under the condition that the receiving end determines that the PPDU to be detected is not transmitted on the 6GHz frequency band, the receiving end determines that the PPDU to be detected is an HT PPDU or a VHT PPDU.

Referring to fig. 8, fig. 8 is a schematic flowchart of a detection method of an EHT PPDU according to an embodiment of the present application, where the detection method of the EHT PPDU includes, but is not limited to, the following steps.

801: and the receiving end judges whether the PPDU to be detected is transmitted on the 6GHz frequency band.

In the embodiment of the application, the HE PPDU and the Non-HT (legacy) PPDU are set to be capable of transmitting in a 6GHz frequency band, and a main channel of the EHT PPDU is set in the 6GHz frequency band; the HT PPDU, the VHT PPDU, and the like cannot transmit data on the 6GHz band, and thus, the preamble format of the frame structure of the EHT PPDU may multiplex the preamble formats of the frame structures of the HT PPDU and the VHT PPDU, but cannot multiplex the preamble format of the HE PPDU.

The frame structure of the Non-ht (legacy) PPDU is shown in table 7, and includes legacy preambles (L-STF, L-LTF, and L-SIG) and a Data (Data) field.

TABLE 7 frame Structure of Non-HT (legacy) PPDU

L-STF

L-LTF

L-SIG

Date

Specifically, after the receiving end receives the PPDU to be detected, it is determined whether the PPDU to be detected is transmitted in the 6GHz band. If the PPDU to be detected is transmitted in the 6GHz band, determining that the PPDU to be detected may be an HT PPDU, a VHTPPDU or an HE PPDU, and further determining which PPDU the PPDU to be detected specifically belongs to according to the method shown in fig. 4; if the PPDU to be detected is transmitted in the 6GHz band, step 802 is executed to further determine whether the PPDU to be detected is an EHTPPDU.

802: and the receiving end determines that the PPDU to be detected is EHT PPDU, HE PPDU or Non-HT (legacy) PPDU, and then identifies the PPDU to be detected by using the symbol of the PPDU to be detected.

In this embodiment, because PPDUs operating in the 6GHz band include three types, that is, Non-ht (legacy) PPDUs, HEPPDUs and EHT PPDUs, when it is determined that the receiving end operates in the 6GHz band, it may be determined that the PPDU to be detected is a Non-ht (legacy) PPDU, an EHT PPDU or an HE PPDU. It is understood that, when it is determined that the PPDU to be detected is transmitted over the 6GHz band, the PPDU to be detected may not be a Non-ht (legacy) PPDU, a HEPPDU or an EHT PPDU. Specifically, it is further required to accurately determine which PPDU to which the PPDU to be detected belongs according to the symbol in the preamble of the PPDU to be detected.

As an optional implementation manner, the further accurately determining which PPDU to which the PPDU to be detected belongs according to the symbol in the preamble of the PPDU to be detected specifically may include: judging whether a first symbol and a second symbol after the L-LTF in the PPDU to be detected are the same or not, and if the first symbol and the second symbol after the L-LTF in the PPDU to be detected are the same, determining that the PPDU to be detected is an HE PPDU; if the first symbol and the second symbol after the L-LTF in the PPDU to be detected are different, further determining whether the first symbol or the second symbol after the L-SIG in the PPDU to be detected is subjected to QBPSK modulation, determining that the PPDU to be detected is an EHT PPDU if the first symbol or the second symbol after the L-SIG in the PPDU to be detected is not subjected to QBPSK modulation, and determining that the PPDU to be detected is a Non-ht (legacy) PPDU, that is, neither a HE PPDU nor an EHT PPDU if the first symbol or the second symbol after the L-SIG in the PPDU to be detected is subjected to QBPSK modulation.

In the embodiment of the present application, comparing the EHT-GF PPDU in table 4 with the EHT-MF PPDU in table 5, the EHT PPDU in table 6 and table 6, and the HE PPDU in table 3, it can be found that the first symbol after the EHT-LTF in the EHT-GF PPDU is QBPSK modulated, and the first symbol after the L-LTF of the EHT-MF PPDU, the EHT PPDU, and the HE PPDU is BPSK modulated. Therefore, after the PPDU to be detected is transmitted on the 6GHz frequency band, whether the first symbol after the LTF of the PPDU to be detected adopts QBPSK modulation can be quickly judged to be the EHT-GFPPDU.

As an optional implementation manner, the further accurately determining which PPDU to which the PPDU to be detected belongs according to the symbol in the preamble of the PPDU to be detected specifically may include: judging whether a first symbol after LTF in the PPDU to be detected adopts QBPSK modulation or not; if so, determining that the PPDU to be detected is an EHT-GF PPDU; if not, judging whether a first symbol and a second symbol after the L-LTF in the PPDU to be detected are the same, and if the first symbol and the second symbol after the L-LTF in the PPDU to be detected are the same, determining that the PPDU to be detected is an HE PPDU; if the first symbol and the second symbol after the L-LTF in the PPDU to be detected are different, further judging whether the first symbol or the second symbol after the L-SIG in the PPDU to be detected adopts QBPSK modulation, if the first symbol or the second symbol after the L-SIG in the PPDU to be detected does not adopt QBPSK modulation, determining that the PPDU to be detected is Non-HT (legacy) PPDU, namely neither HE PPDU nor EHT PPDU, if the first symbol or the second symbol after L-SIG in the PPDU to be detected is QBPSK modulated, it is determined that the PPDU to be detected is EHT PPDU, and further, in case that the first symbol or the second symbol after L-SIG in PPDU to be detected is QBPSK modulated, and if the first symbol behind the L-SIG in the PPDU to be detected is modulated by QBPSK, determining that the PPDU to be detected is EHT-MF PPDU.

In the embodiment of the present application, it can be seen from table 7 that the L-SIG in the Non-ht (legacy) PPDU is followed by the data field Date, and the transmitted symbols in the data field are modulated by any one of BPSK, QPSK,16QAM, and 64 QAM. Therefore, after determining that the PPDU to be detected is a Non-ht (legacy) PPDU, an HE PPDU or an EHT PPDU, whether a symbol after L-SIG of the PPDU to be detected is Date or not and whether a symbol for data transmission is modulated by any one of BPSK, QPSK,16QAM and 64QAM may be determined to be the Non-ht (legacy) PPDU.

As an optional implementation manner, the further accurately determining which PPDU to which the PPDU to be detected belongs according to the symbol in the preamble of the PPDU to be detected specifically may include: judging whether a first symbol after LTF in the PPDU to be detected adopts QBPSK modulation or not; if so, determining that the PPDU to be detected is an EHT-GF PPDU; if not, judging whether a first symbol and a second symbol after the L-LTF in the PPDU to be detected are the same, and if the first symbol and the second symbol after the L-LTF in the PPDU to be detected are the same, determining that the PPDU to be detected is an HE PPDU; if the first symbol and the second symbol after the L-LTF in the PPDU to be detected are different, further determining whether the first symbol or the second symbol after the L-SIG in the PPDU to be detected is subjected to QBPSK modulation, if neither the first symbol nor the second symbol after the L-SIG in the PPDU to be detected is subjected to QBPSK modulation, continuously determining whether the symbol after the L-SIG in the PPDU to be detected is dated, and the symbol for data transmission is modulated by any one of BPSK, QPSK,16QAM and 64QAM, if the symbol after the L-SIG in the PPDU to be detected is dated, and the symbol for data transmission is modulated by any one of BPSK, QPSK,16QAM and 64QAM, determining that the PPDU to be detected is a Non-ht (legacy) PPDU; and if the first symbol or the second symbol after the L-SIG in the PPDU to be detected is modulated by QBPSK, determining that the PPDU to be detected is an EHT PPDU. Further, in the case that the first symbol or the second symbol after the L-SIG in the PPDU to be detected is modulated by QBPSK, if the first symbol after the L-SIG in the PPDU to be detected is modulated by QBPSK, it is determined that the PPDU to be detected is an EHT-MF PPDU.

It can be seen that, in the embodiment of the present application, since the primary channel of the EHT PPDU is set in the 6GHz band, the HT PPDU and the VHT PPDU cannot be associated with the 6GHz band in addition to the HE PPDU and the Non-HT (legacy) PPDU in the existing PPDU. Therefore, when the receiving end detects the PPDU, the PPDU to be detected can be preliminarily distinguished by judging whether the PPDU to be detected is transmitted on the 6GHz frequency band. That is, if the PPDU to be detected is transmitted in the 6GHz band, it may be determined that the PPDU to be detected may be an EHT PPDU, an HE PPDU, or a Non-ht (legacy) PPDU. In addition, the HT PPDU and the VHT PPDU cannot be associated to the 6GHz band, so the EHT PPDU may multiplex formats of the HT PPDU and the VHT PPDU, overhead of a preamble of the EHT PPDU is reduced, and thus the EHT PPDU may be quickly identified through a symbol.

Referring to fig. 9, fig. 9 is a schematic flowchart of a detection method of an EHT PPDU according to an embodiment of the present application, where the detection method of the EHT PPDU includes, but is not limited to, the following steps.

901: and the receiving end judges whether the bandwidth of the PPDU to be detected is greater than or equal to the lowest bandwidth X MHz of the EHT PPDU, wherein X is greater than or equal to 80.

In this embodiment of the present application, since the lowest bandwidth of the EHT PPDU is X MHz, a receiving end may preliminarily distinguish the type of the PPDU to be detected by determining the bandwidth of the received PPDU to be detected, that is, if the bandwidth of the PPDU to be detected is greater than or equal to X MHz, the PPDU type with the maximum bandwidth smaller than X MHz may be excluded, and it is determined that the PPDU to be detected may include the EHT PPDU, and then whether the PPDU to be detected is an EHT PPDU may be continuously identified according to a symbol of the EHT PPDU.

Specifically, after receiving the PPDU to be detected, the receiving end judges whether the bandwidth of the PPDU to be detected is greater than or equal to X MHz; if the bandwidth of the PPDU to be detected is less than X MHz, determining that the PPDU to be detected may be HT PPDU, VHTPPDU or HE PPDU, and further determining which PPDU the PPDU to be detected belongs to according to the method shown in the figure; if the bandwidth of the PPDU to be detected is greater than or equal to X MHz, step 902 is executed to further determine whether the PPDU to be detected is an EHT PPDU.

902: and under the condition that the bandwidth of the PPDU to be detected is determined to be greater than or equal to X MHz, determining that the PPDU to be detected contains an EHT PPDU, and identifying the EHT PPDU by using the symbol of the EHT PPDU.

In this embodiment of the present application, since the lowest bandwidth of the EHT PPDU is X MHz, after the receiving end determines that the bandwidth of the PPDU to be detected is greater than or equal to X MHz, it may be determined that the PPDU to be detected may be an EHT PPDU. In addition, since the maximum bandwidth of the VHT PPDU is 160MHz, the maximum bandwidth of the HE PPDU is 160MHz, and the value of X is greater than or equal to 80. Therefore, it is necessary to further determine which generation PPDU the above-mentioned PPDU to be detected is in two cases.

In the first case, when the value of X is greater than 160 and the bandwidth of the PPDU to be detected is greater than or equal to X MHz, it is determined that the PPDU to be detected is an EHT PPDU.

In a second case, when the value of X is greater than 80 and less than 160, and the bandwidth of the PPDU to be detected is greater than or equal to X MHz and less than or equal to 160MHz, it is determined that the PPDU to be detected is a VHT PPDU, an HE PPDU or an EHT PPDU.

In the first case, it may be determined that the PPDU to be detected is the EHTPPDU directly through the bandwidth of the PPDU to be detected.

For the second case, it is further required to determine which of the VHT PPDU, the HE PPDU or the EHT PPDU the PPDU to be detected belongs to according to the symbol of the PPDU to be detected.

In the second case, the PPDU to be detected may include VHT PPDU, HE PPDU or EHT PPDU; accordingly, the frame structure preamble format of the EHT PPDU may multiplex the format of the HT PPDU, i.e., the EHT PPDU may be in the formats of table 4 and table 5. It is understood that, in the embodiment of the present application, it is understood that, in the second case, the frame structure preamble format of the EHT PPDU may be other formats different from the HE PPDU and the VHT PPDU in addition to the two formats of the above table 4 and table 5, which multiplex the existing HT-GF PPDU and HT-MF PPFU, and the embodiment of the present application is not limited.

In the embodiment of the present application, comparing the EHT-GF PPDU in table 4 with the EHT-MF PPDU in table 5 and the HE PPDU in table 3, it can be found that the first symbol after the EHT-LTF in the EHT-GF PPDU is QBPSK modulated, and the first symbol after the L-LTF in the EHT-MF PPDU, the EHT PPDU and the HE PPDU is BPSK modulated. Therefore, in the second case, it may be quickly determined that the PPDU to be detected is an EHT-GF PPDU according to whether the first symbol after the LTF of the PPDU to be detected adopts QBPSK modulation. In addition, because the L-SIG and the RL-SIG in the preamble format of the HE PPDU are the same, whether the first symbol and the second symbol after the L-LTF in the PPDU to be detected are the same can be judged to determine whether the PPDU to be detected is the HE PPDU. And finally, a first symbol behind the L-SIG in the VHT PPDU adopts BPSK modulation, and a second symbol adopts QBPSK modulation. Therefore, the PPDU to be detected can be determined to be a VTH PPDU according to whether BPSK modulation and QBPSK modulation are respectively adopted for a first symbol and a second symbol after L-SIG in the PPDU to be detected.

In the second case, the determining, according to the symbol of the PPDU to be detected, which one of the VHT PPDU, the HE PPDU or the EHT PPDU the PPDU to be detected belongs to may specifically be as shown in fig. 10:

1001: and judging whether the first symbol after the LTF in the PPDU to be detected adopts QBPSK modulation or not.

If the first symbol after the LTF in the PPDU to be detected is modulated by QBPSK, determining that the PPDU to be detected is an EHT-GF PPDU, as shown in table 4; if not, go to step 1002.

1002: and judging whether the first symbol and the second symbol after the L-LTF in the PPDU to be detected are the same.

If the first symbol and the second symbol after the L-LTF in the PPDU to be detected are the same, determining that the PPDU to be detected is an HE PPDU, as shown in Table 3; if the first symbol and the second symbol after the L-LTF in the PPDU to be detected are not the same, step 1003 is executed.

1003: and judging whether the first and second symbols after the L-SIG in the PPDU to be detected adopt BPSK and QBPSK modulation respectively.

If the first and second symbols after the L-SIG in the PPDU to be detected respectively adopt BPSK and QBPSK modulation, it is determined that the PPDU to be detected is a VHT PPDU, as shown in table 2, and if the first and second symbols after the L-SIG in the PPDU to be detected are not BPSK and QBPSK modulation, respectively, step 1004 is executed.

1004: and judging whether the first symbol after the L-SIG in the PPDU to be detected adopts QBPSK modulation.

If the first symbol after the L-SIG in the PPDU to be detected is modulated by QBPSK, it is determined that the PPDU to be detected is an EHT-MF PPDU, as shown in table 5.

Referring to fig. 11, fig. 11 is a schematic structural diagram of an EHT PPDU detection apparatus according to an embodiment provided in the present application. The EHT PPDU detection device of the embodiment of the present application includes: a frequency judging unit 1101, a determining unit 1102 and a recognizing unit 1103.

A frequency determining unit 1101, configured to determine whether a PPDU of a physical layer protocol data unit to be detected is transmitted in a 6GHz band;

a determining unit 1102, configured to determine that the PPDU to be detected includes an EHT PPDU if the frequency determining unit 1101 determines that the PPDU to be detected is yes;

an identifying unit 1103, configured to identify the EHT PPDU using a symbol of the EHT PPDU.

In the embodiment of the application, the main channel of the EHT PPDU is set in the 6GHz band.

In this embodiment of the present application, since the main channel of the EHT PPDU is set on the 6GHz band, the receiving end may preliminarily distinguish the type of the PPDU to be detected by determining the received band of the PPDU to be detected, that is, if the PPDU to be detected is transmitted on the 6GHz band, the type of the PPDU which cannot operate on the 6GHz band may be excluded, and it is determined that the PPDU to be detected may include the EHT PPDU, and then it may continue to identify whether the PPDU to be detected is an EHT PPDU according to the symbol of the EHT PPDU.

In a possible embodiment, the determining unit 1102 is configured to determine that the PPDU to be detected is an EHTPPDU, an HE PPDU, or a Non-ht (legacy) PPDU; or determining that the PPDU to be detected is an EHT PPDU or HEPPDU.

In a possible implementation manner, in the preamble of the EHT PPDU, the first symbol and the second symbol after the L-LTF are not the same in symbol;

the identifying unit 1103 is configured to determine that the PPDU to be detected is an HE PPDU if a symbol of a first symbol and a symbol of a second symbol after the L-LTF are the same.

In the embodiment of the present application, since RL-SIG identical to L-STG exists in the frame structure preamble format of the HE PPDU, after determining that the PPDU to be detected is an EHT PPDU or an HE PPDU, or after determining that the PPDU to be detected is a Non-ht (legacy) PPDU, an EHT PPDU, or an HE PPDU, and in a case that the EHT does not multiplex the format of the HE PDPU, that is, in a case that no RL-SIG exists in the format of the EHTPPDU, whether the PPDU to be detected is the HE PPDU may be determined by determining whether a first symbol (corresponding to L-SIG) and a second symbol (corresponding to RL-SIG) after the LTF in the PPDU to be detected are identical.

the identifying unit 1103 is configured to determine that the EHT PPDU is an EHT-GF PPDU if a first symbol after the LTF of the PPDU to be detected is QBPSK modulated.

In a possible embodiment, the preamble format of the EHT-GF PPDU sequentially includes:

EHT-GF-STF、EHT-LTF、EHT-SIG1QBPSK、EHT-SIG2QBPSK。

In a possible embodiment, in the preamble format of the EHT PPDU, a first symbol or a second symbol after an L-SIG of the EHT PPDU is QBPSK modulated;

the identifying unit 1103 is configured to determine that the PPDU to be detected is an EHT PPDU if a first symbol or a second symbol after the L-SIG of the PPDU to be detected is QBPSK modulated.

In this embodiment of the present application, since a main channel of the EHT PPDU is set on a 6GHz band, and the HT PPDU cannot transmit on the 6GHz band, a format of the HT PPDU may be multiplexed by the EHT PPDU format as the EHT PPDU, and in a case that the EHT PPDU may multiplex the HT PPDU format, a format difference between the EHT PPDU and the HE PPDU is that a first symbol or a second symbol after an L-SIG of the EHT PPDU employs QBPSK modulation. Therefore, in a case where the EHT PPDU may multiplex the HT PPDU format, after determining that the PPDU to be detected is the EHT PPDU, the HE PPDU, or the Non-HT (legacy) PPDU, or after determining that the PPDU to be detected is the EHT PPDU or the HE PPDU, it may be quickly determined whether the PPDU to be detected is the EHT PPDU by performing the above-described steps.

In a possible embodiment, the identifying unit 1103 is further configured to determine that the PPDU to be detected is a Non-ht (legacy) PPDU if the PPDU to be detected is not determined as an EHT PPDU or the PPDU to be detected is not determined as an HE PPDU.

In a possible embodiment, in the preamble format of the EHT PPDU, the L-SIG of the EHT-GF PPDU is modulated by QBPSK;

the identification unit 1103 is further configured to determine that the PPDU to be detected is an EHT-GF PPDU if the L-SIG of the PPDU to be detected is modulated by QBPSK.

In the embodiment of the present application, since the main channel of the EHT PPDU is set on the 6GHz band and the HT-GF PPDU cannot transmit on the 6GHz band, the EHT PPDU format may multiplex the HT-GF PPDU format as the EHT-GF PPDU. In the case of multiplexing the EHT PPDU and HT-GF PPDU formats, the L-SIG in the EHT-GF PPDU formats is QBPSK modulated, while the SIG in the HEPDU and Non-HT (legacy) PPDU formats is also modulated by other modulation types, so the EHT-GF PPDU formats are different from the HE PPDU formats and Non-HT (legacy) PPDU formats in that the L-SIG is QBPSK modulated. Therefore, in the case that the EHT PPDU multiplexes the HT-GF PPDU format, and after determining that the PPDU to be detected is an HE PPDU, a Non-HT (legacy) PPDU, or an EHT PPDU, whether the PPDU to be detected is an EHT-GF PPDU may be determined by determining whether SIG of the PPDU to be detected all employs QBPSK modulation.

the identifying unit 1103 is configured to determine that the PPDU to be detected is a Non-ht (legacy) PPDU if the L-SIG rear of the PPDU to be detected is Date.

In the embodiment of the present application, since the main channel of the EHT PPDU is set on the 6GHz band and the HT PPDU cannot transmit on the 6GHz band, the format of the EHT PPDU may be multiplexed as the EHT PPDU, and in addition, the format of the EHT PPDU is different from the format of the HE PPDU and the format of the Non-HT (legacy) PPDU in that the first symbol or the second symbol after the L-SIG of the HT PPDU employs QBPSK modulation. Therefore, in the case where the EHT PPDU may multiplex the HT PPDU format, after determining that the PPDU to be detected is the EHT PPDU, the HE PPDU, or the Non-HT (legacy) PPDU, it may be quickly determined whether the PPDU to be detected is the EHT PPDU by performing the above-described steps.

Referring to fig. 12, fig. 12 is a schematic structural diagram of an EHT PPDU detection apparatus according to another embodiment provided in the present application. The EHT PPDU detection device of the embodiment of the present application includes: a bandwidth judging unit 1201, a determining unit 1202 and an identifying unit 1203.

In the embodiment of the application, the lowest bandwidth of the frequency band where the EHT PPDU is located is set to be X MHz, and X is greater than or equal to 80.

A bandwidth determining unit 1201, configured to determine whether a bandwidth of the PPDU to be detected is greater than or equal to X MHz;

a determining unit 1202, configured to determine that the PPDU to be detected includes an EHT PPDU if the bandwidth determining unit 1201 determines that the PPDU to be detected includes the EHT PPDU;

an identifying unit 1203 is configured to identify the EHT PPDU by using a symbol of the EHT PPDU.

In this embodiment of the present application, since the lowest bandwidth of the EHT pdu is X MHz, a receiving end may preliminarily distinguish the type of the PPDU to be detected by determining the bandwidth of the received PPDU to be detected, that is, if the bandwidth of the PPDU to be detected is greater than or equal to X MHz, the type of the PPDU whose maximum bandwidth is less than X MHz may be excluded, and it is determined that the PPDU to be detected may include the EHT PPDU, and then it may continue to identify whether the PPDU to be detected is an EHT PPDU according to a symbol of the EHT PPDU.

In a possible embodiment, when the value of X is less than 160 and the bandwidth of the PPDU to be detected is less than or equal to 160MHz, the determining unit 1202 is configured to determine that the PPDU to be detected is a VHT PPDU, an HE PPDU, or an EHT PPDU.

the identifying unit 1203 is configured to determine that the PPDU to be detected is an HE PPDU if a symbol of a first symbol and a symbol of a second symbol after the L-LTF are the same.

In a possible implementation manner, if a first symbol after the L-SIG of the PPDU to be detected is BPSK modulated and a second symbol after the L-SIG is BPSK modulated, it is determined that the PPDU to be detected is a VHT PPDU.

In a possible embodiment, in the preamble format of the EHT PPDU, a first symbol after an EHT-LTF of the EHT-GF PPDU is modulated by QBPSK; the identifying the EHT PPDU using the symbol of the EHT PPDU includes:

and if the first symbol after the LTF of the PPDU to be detected is modulated by QBPSK, determining the EHT PPDU as the EHT-GF PPDU.

In the embodiment of the present application, since the format of the HT-GF PPDU is different from the VHT PPDU, the HE PPDU, and the Non-HT (legacy) PPDU, the first symbol after the EHT-LTF is QBPSK modulated. Therefore, in the case that the EHT PPDU multiplexes the HT-GF PPDU format, after determining that the PPDU to be detected is a VHT PPDU, an HE PPDU, a Non-HT (legacy) PPDU, or an EHT PPDU, it may be determined whether the PPDU to be detected is an EHT-GF PPDU by determining whether a first symbol after LTF of the PPDU to be detected employs QBPSK modulation.

EHT-GF-STF、EHT-LTF、EHT-SIG1QBPSK、EHT-SIG2QBPSK。

In a possible implementation manner, in the preamble format of the EHT PPDU, a first symbol after an L-SIG of the EHT-MF PPDU is modulated by QBPSK; the identifying unit 1203 is configured to determine that the PPDU is an EHT PPDU if a first symbol after the L-SIG of the PPDU to be detected is QBPSK modulated.

In the embodiment of the present application, since the lowest bandwidth of the EHT PPDU is X MHz, X is greater than or equal to 80, and the maximum bandwidth of the HT-MFPPDU is less than 80, the EHT pdu may multiplex the format of the HT-MF PPDU as the EHT-MF PPDU. In case that the EHTPPDU may multiplex the format of the HT-MF PPDU, the formats of the EHT-MF PPDU and HE PPDU, VHT PPDU, and Non-HT (legacy) PPDU are different in that the first symbol after L-SIG of the HT-MF PPDU is QBPSK modulated. Therefore, after determining that the PPDU to be detected is VHT PPDU, EHT PPDU, HE PPDU or Non-HT (legacy) PPDU, whether the first symbol after L-SIG of the PPDU to be detected is modulated by QBPSK can be judged, and the PPDU to be detected is EHT-MF PPDU can be determined.

Referring to fig. 13, fig. 13 is a schematic structural diagram of an EHT PPDU detection apparatus according to another embodiment provided in the present application. The EHT PPDU detection apparatus 1300 of the present embodiment includes one or more processors 1311, a communication interface 1312, and a memory 1313. The processor 1311, the communication interface 1312, and the memory 1313 may be connected to each other via a bus 1314.

The processor 1311 includes one or more general-purpose processors, which may be any type of device capable of Processing electronic instructions, including a Central Processing Unit (CPU), a microprocessor, a microcontroller, a main processor, a controller, and an ASIC (Application Specific Integrated Circuit), among others. The processor 1311 executes various types of digitally stored instructions, such as software or firmware programs stored in the memory 1313, which enable the computing node 300 to provide a wide variety of services. For example, the processor 1311 is capable of executing programs or processing data to perform at least a portion of the methods discussed herein. The feature extraction module and the panoramic semantic model shown in fig. 8 may be run in the processor 1311.

The communication interface 1312 may be a wired interface (e.g., an ethernet interface) for communicating with other computing nodes or users.

Memory 1313 may include Volatile Memory (Volatile Memory), such as Random Access Memory (RAM); the Memory may also include a Non-volatile Memory (Non-volatile Memory), such as a Read-Only Memory (ROM), a Flash Memory (Flash Memory), a Hard Disk Drive (HDD), or a Solid-State Drive (SSD) Memory, which may also include a combination of the above types of memories. Memory 1313 may store program codes as well as program data. Wherein the program code includes a judgment unit code, a determination unit code, and an identification unit code.

Wherein the processor 1311 is configured to, by calling the program code in the memory 1313, perform the following steps:

the processor 1311 is configured to determine that the PPDU to be detected includes an EHT PPDU if the PPDU is transmitted in a 6GHz frequency band, and then identify the EHT PPDU using a symbol of the EHT PPDU; wherein the main channel of the EHT PPDU is arranged in the 6GHz frequency band.

The processor 1311 is configured to determine that the PPDU to be detected includes an EHT PPDU if a bandwidth of the PPDU to be detected is greater than or equal to X MHz, and then identify the EHT PPDU using a symbol of the EHT PPDU; the frequency band where the EHT PPDU is located is set to have the lowest bandwidth of X MHz, and X is greater than or equal to 80.

In another embodiment of the present application, a computer-readable storage medium is provided, which stores a computer program that, when executed by a processor, implements: if the physical layer protocol data unit (PPDU) to be detected is transmitted on a 6GHz frequency band, determining that the PPDU to be detected contains an EHT PPDU, and then identifying the EHT PPDU by using a symbol of the EHT PPDU; the main channel of the EHT PPDU is arranged in a 6GHz frequency band;

the computer program realizes when executed by a processor: if the bandwidth of the PPDU to be detected is larger than or equal to XMHz, determining that the PPDU to be detected contains an EHT PPDU, and then identifying the EHT PPDU by using the symbol of the EHT PPDU; the frequency band where the EHT PPDU is located is set to have the lowest bandwidth of X MHz, and X is greater than or equal to 80.

The computer readable storage medium may be an internal storage unit of the terminal of any of the foregoing embodiments, for example, a hard disk or a memory of the terminal. The computer-readable storage medium may also be an external storage device of the terminal, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), and the like provided on the terminal. Further, the computer-readable storage medium may include both an internal storage unit and an external storage device of the terminal. The computer-readable storage medium stores the computer program and other programs and data required by the terminal. The above-described computer-readable storage medium may also be used to temporarily store data that has been output or is to be output.

The EHT PPDU detection method and the related devices disclosed in the embodiments of the present application are introduced in detail above, and a specific example is applied in the present application to explain the principle and the implementation of the present application, and the description of the above embodiments is only used to help understand the method and the core idea of the present application; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.

Claims

1. A detection method of an EHT PPDU (physical layer protocol data unit) with extremely high throughput is characterized in that a main channel of the EHT PPDU is arranged in a 6GHz frequency band; the method comprises the following steps:

2. The method of claim 1, wherein the determining that the PPDU to be detected comprises an EHT PPDU comprises:

determining that the PPDU to be detected is an EHT PPDU, a high-efficiency physical layer protocol data unit (HE PPDU) or a Non-high-throughput physical layer protocol data unit (Non-HT (legacy) PPDU);

or determining that the PPDU to be detected is an EHT PPDU or HE PPDU.

3. The method of claim 2, wherein the first symbol and the second symbol after the legacy long training field L-LTF in the preamble of the EHT PPDU are not the same symbol;

the identifying the EHT PPDU using the symbol of the EHT PPDU comprises:

and if the symbols of the first symbol and the second symbol after the L-LTF are the same, determining that the PPDU to be detected is HEPPU.

4. The method according to any of claims 1 to 3, wherein in the preamble format of the EHT PPDU, a first symbol after an EHT-LTF of an EHT-GF PPDU is modulated by rotating binary phase shift keying (QBPSK); the identifying the EHT PPDU using the symbol of the EHT PPDU comprises:

and if the first symbol after the LTF of the PPDU to be detected is modulated by QBPSK, determining that the EHT PPDU is EHT-GFPPDU.

5. The method of claim 4, wherein the preamble format of the EHT-GF PPDU comprises the following symbols in sequence:

EHT-GF-STF、EHT-LTF、EHT-SIG1QBPSK、EHT-SIG2QBPSK。

6. the method of claim 4, wherein a preamble format of the EHT PPDU comprises a first symbol or a second symbol following a legacy signaling field L-SIG of an EHT PPDU is QBPSK modulated, and wherein identifying the EHT PPDU using the symbol of the EHT PPDU comprises:

7. The method of claim 6,

the preamble format of the EHT-MF PPDU comprises the following symbols in sequence: L-STF, L-LTF, L-SIG BPSK, EHT-SIG1-QBPSK, EHT-SIG 2-QBPSK;

8. The method of claim 7, further comprising:

if the PPDU to be detected is not determined as the EHT PPDU or the HE PPDU, determining that the PPDU to be detected is a Non-HT (legacy) PPDU.

9. The method according to claim 2, wherein in the preamble format of the EHT PPDU, a legacy signaling field L-SIG of the EHT-GF PPDU is QBPSK modulated, and after determining that the PPDU to be detected is a Non-ht (legacy) PPDU, an EHTPPDU, or an HE PPDU, the method further comprises:

and if the L-SIG of the PPDU to be detected is modulated by QBPSK, determining that the PPDU to be detected is EHT-GF PPDU.

10. The method of claim 9, wherein a data field Date follows the L-SIG of a Non-ht (legacy) PPDU, and wherein after determining that the PPDU to be detected is a Non-ht (legacy) PPDU, an EHT PPDU, or a HE PPDU, the method further comprises:

11. The method according to claim 10, wherein in the preamble format of the EHT PPDU, a first symbol or a second symbol following an L-SIG of the EHT PPDU is QBPSK modulated, and after determining that the PPDU to be detected is an EHT pdu or a HE PPDU, the method further comprises:

12. A detection method of an EHT PPDU is characterized in that the frequency band where the EHT PPDU is located is provided with the lowest bandwidth of XMHz, X is greater than or equal to 80, and the method comprises the following steps:

if the bandwidth of the PPDU to be detected is larger than or equal to XMHz, determining that the PPDU to be detected contains an EHT PPDU, and then identifying the EHT PPDU by using the symbol of the EHT PPDU.

13. The method according to claim 12, wherein in a case where the value of X is less than 160 and the bandwidth of the PPDU to be detected is less than or equal to 160MHz, the determining that the PPDU to be detected contains an EHT PPDU comprises:

and determining that the PPDU to be detected is VHT PPDU, HE PPDU or EHT PPDU.

14. The method of claim 13, wherein a preamble of the EHT PPDU includes a first symbol and a second symbol following the L-LTF, which are not identical in symbol;

the identifying the EHT PPDU using the symbol of the EHT PPDU comprises:

15. The method of claim 14 wherein identifying the EHT pdus using the symbols of the EHT PPDU comprises:

and if the first symbol after the L-SIG of the PPDU to be detected adopts BPSK modulation and the second symbol adopts QBPSK modulation, determining that the PPDU to be detected is VHT PPDU.

16. The method according to any of claims 12 to 14, wherein in the preamble format of the EHT PPDU, a first symbol after an EHT-LTF of the EHT-GF PPDU is QBPSK modulated; the identifying the EHT PPDU using the symbol of the EHT PPDU comprises:

17. The method of claim 16, wherein the preamble format of the EHT-GF PPDU comprises, in order:

EHT-GF-STF、EHT-LTF、EHT-SIG1 QBPSK、EHT-SIG2 QBPSK。

18. the method of claim 16, wherein in the preamble format of the EHT PPDU, a first symbol after L-SIG of the EHT-MFPPDU is QBPSK modulated; the identifying the EHT PPDU using the symbol of the EHT PPDU comprises:

19. The method of claim 18,

the preamble format of the EHT-MF PPDU comprises the following symbols in sequence: L-STF, L-LTF, L-SIG BPSK, EHT-SIG1-QBPSK, EHT-SIG 2-QBPSK.

20. An EHT PPDU detection apparatus, wherein a main channel of the EHT PPDU is set at a 6GHz frequency band, the apparatus comprising:

the frequency judging unit is used for judging whether a PPDU (physical layer protocol data unit) to be detected is transmitted on a 6GHz frequency band or not;

the determining unit is used for determining that the PPDU to be detected contains EHTPPDU under the condition that the frequency judging unit judges that the PPDU to be detected contains EHTPPDU;

21. The apparatus of claim 20,

the determining unit is configured to determine that the PPDU to be detected is an EHT PPDU, an HE PPDU or a Non-high throughput physical layer protocol data unit Non-ht (legacy) PPDU; or determining that the PPDU to be detected is an EHT PPDU or HE PPDU.

22. The apparatus of claim 21, wherein a preamble of the EHT PPDU includes a first symbol and a second symbol following the L-LTF, which are not identical in symbol;

23. The apparatus according to any of claims 20-22, wherein in the preamble format of EHT PPDU, the first symbol after the EHT-LTF of EHT-GF PPDU is modulated with a rotating binary phase shift keying (QBPSK);

24. The apparatus of claim 23, wherein the preamble format of the EHT-GF PPDU comprises, in order:

EHT-GF-STF、EHT-LTF、EHT-SIG1 QBPSK、EHT-SIG2 QBPSK。

25. the apparatus of claim 23, wherein in the preamble format of the EHT PPDU, a first symbol or a second symbol following an L-SIG of the EHT PPDU is QBPSK modulated;

26. The apparatus of claim 25,

27. The apparatus of claim 26,

the identification unit is further configured to determine that the PPDU to be detected is a Non-ht (legacy) PPDU if the PPDU to be detected is not determined to be an EHT PPDU or the PPDU to be detected is not determined to be an HE PPDU.

28. The apparatus of claim 21, wherein in the preamble format of the EHT PPDU, L-SIG of the EHT-GFPPDU is QBPSK modulated;

29. The apparatus of claim 28, wherein an L-SIG of a Non-ht (legacy) PPDU is followed by a data field Date;

30. The apparatus of claim 29, wherein in the preamble format of the EHT PPDU, a first symbol or a second symbol following an L-SIG of the EHT PPDU is QBPSK modulated;

31. A detection device for EHT PPDU is characterized in that the frequency band where the EHT PPDU is located is provided with the lowest bandwidth of XMHz, X is greater than or equal to 80, and the device comprises:

the determining unit is used for determining that the PPDU to be detected contains the EHTPPDU under the condition that the bandwidth judging unit judges that the PPDU to be detected contains the EHTPPDU;

32. The apparatus according to claim 31, wherein the determining unit is configured to determine that the PPDU to be detected is a VHT PPDU, a HEPPDU or an EHT PPDU if a value of X is less than 160 and a bandwidth of the PPDU to be detected is less than or equal to 160 MHz.

33. The apparatus of claim 32, wherein the first symbol and the second symbol after the L-LTF in the preamble of the EHT PPDU are not the same symbol;

34. The apparatus of claim 33, wherein the PPDU to be detected is determined to be the VHT PPDU if a first symbol after L-SIG and a second symbol after L-SIG of the PPDU to be detected are BPSK modulated and QBPSK modulated.

35. The apparatus according to any of claims 31-33, wherein in the preamble format of EHT PPDU, the first symbol after LTF of EHT-GF PPDU is QBPSK modulated; the identifying the EHT PPDU using the symbol of the EHT PPDU comprises:

36. The apparatus of claim 35, wherein the preamble format of the EHT-GF PPDU comprises, in order:

EHT-GF-STF、EHT-LTF、EHT-SIG1 QBPSK、EHT-SIG2 QBPSK。

37. the apparatus of claim 35, wherein in the preamble format of the EHT PPDU, a first symbol after L-SIG of EHT-MFPPDU is QBPSK modulated; and the identification unit is used for determining that the PPDU to be detected is EHT-MF PPDU if a first symbol behind the L-SIG of the PPDU to be detected is modulated by QBPSK.

38. The apparatus of claim 37,

39. An EHT PPDU detection device, comprising: a processor and a memory, the processor executing code in the memory to perform the method of any of claims 1-11 or the method of any of claims 12-19.

40. A computer non-transitory storage medium comprising instructions that, when executed on an EHT PPDU detection device, cause the EHT PPDU detection device to perform a method according to any one of claims 1-11 or a method according to any one of claims 12-19.