CN113162957B

CN113162957B - Transmission method, device and system of physical layer protocol data unit (PPDU)

Info

Publication number: CN113162957B
Application number: CN202010075456.XA
Authority: CN
Inventors: 杨博
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2020-01-22
Filing date: 2020-01-22
Publication date: 2024-04-12
Anticipated expiration: 2040-01-22
Also published as: CN113162957A

Abstract

The application provides a transmission method, a device and a system of a physical layer protocol data unit (PPDU), wherein the method comprises the following steps: the method comprises the steps that a transmitting device obtains a PPDU, wherein the PPDU comprises a traditional information symbol L-SIG and a first symbol positioned behind the L-SIG, and the first symbol is used for representing a standard protocol version followed by the PPDU; the transmitting device transmits the PPDU to the receiving device such that the receiving device determines a standard protocol version to which the PPDU conforms based on the first symbol. Therefore, the format of the PPDU in the new standard protocol version is set, the transmission of the PPDU is convenient to realize, the new standard protocol version complied with by the PPDU can be determined, the new standard protocol version can be distinguished, and the demodulation of the PPDU is convenient to realize.

Description

Transmission method, device and system of physical layer protocol data unit (PPDU)

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a method, an apparatus, and a system for transmitting a physical layer protocol data unit PPDU.

Background

With the progressive introduction of new technologies and new features by the IEEE 802.11 standards organization, such as: the new generation of 802.11be introduces new characteristics of Multi-link (Multi-link), multi-access point (Multi-AP (Access Point)), low latency, large bandwidth and the like, which are different from the previous protocol standard version, and forms a new generation of protocol standard version, such as: 802.11a, 802.11n, 802.11ac, 802.11ax, 802.11be, subsequent versions of protocol standards, etc. The formation of new protocol standard versions requires redefining the physical layer protocol data units (Physical layer Protocol Data Unit, PPDUs) of different formats in the wireless local area network (Wireless Local Area Network, WLAN) so that the WLAN device can distinguish between the different protocol standard versions based on the format of the PPDUs.

In general, a WLAN transmitter transmits a PPDU through an antenna after a series of operations such as encoding, modulating, frequency converting, amplifying, etc. the PPDU. The WLAN receiver performs frame identification on the PPDU according to the signal received by the antenna. Such as: determining a starting position of the PPDU by a conventional short training symbol (Legacy Short Training Field, L-STF) and a conventional long training symbol (Legacy Long Training Field L-LTF); the length of the PPDU is determined by a Legacy SIGnal (L-SIG).

However, for PPDUs (i.e., physical frames) of different protocol standard versions, the WLAN receiver needs more information of the PPDUs, such as bandwidth, modulation coding scheme, space division multiplexing scheme, frequency division multiplexing scheme, etc., to be able to demodulate other parts of the PPDUs. While other parts of the PPDU are different from each other with respect to different protocol standard versions, so different SIGnal needs to be used to carry the corresponding information. Such as: high Throughput information symbol (HT-SIG) 1 and HT-SIG2 in 802.11 n; very high throughput information symbols (Very High Throughput SIGNAL, VHT-SIG) in 802.11 ac; high efficiency information symbol (HE-SIG) in 802.11 ax.

Since the symbol may be used to guide demodulation of the information of the entire PPDU, the symbol may be located at the front end of the PPDU, such as typically located after the L-SIG, or located at another location (such as after a repeated legacy information symbol (RL-SIG) in 802.11 ax) in order to facilitate timely parsing of the PPDU. Based on the foregoing description, fig. 1 shows a format of a general PPDU supporting various protocol standard versions. As shown in fig. 1, a format of one PPDU is generally composed of L-STF, L-LTF, L-SIG, PPDU identification (Marker) symbol, information symbol (XX-SIG), training (XX-Training) symbol, other symbol (more SIGnal), DATA (DATA) symbol, and the like in order from Least Significant Bit (LSB) to Most Significant Bit (MSB).

Wherein, all protocol standard versions usually support three symbols of L-STF, L-LTF and L-SIG, which are common symbols with fixed format and can be resolved without recognition. PPDU Marker symbols (symbols) are used to distinguish between different versions of the protocol standard, and different definitions and formats are used. Such as: when the WLAN receiver demodulates the RL-SIG, it can be identified that the PPDU is an 802.11ax PPDU. Thus, the RL-SIG is referred to as a PPDU Marker symbol. And the following steps: when the WLAN receiver demodulates the L-SIG and then the quadrature binary phase shift keying (quadrature binary phase shift keying, QBPSK) modulated HT-SIG, it can recognize that the PPDU is an 802.11n PPDU. Thus, the HT-SIG is referred to as a PPDU Marker symbol. In addition, since the PPDU Marker symbol is always immediately after the L-SIG and may be represented by symbols having different meanings in different protocol standard versions to function as a format for identifying the PPDU, the PPDU is illustrated by a dotted line in fig. 1. The XX-tracking symbol may play a training role, i.e. a dedicated LTF (XX-LTF). Such as: high-efficiency short training symbols (High Efficient SIGnal Short Training Field, HE-STF) and high-efficiency long training symbols (High Efficient SIGnal Long Training Field, HE-LTF) in 802.11 ax; VHT-STF and VHT-LTF in 802.11ac, and the like. In a different version of the protocol standard, the XX-tracking symbol may be followed by a more SIGNAL, so is illustrated in FIG. 1 by a dashed line.

In the evolution of the 802.11 technology, in view of PPDU compatibility, the new-generation protocol standard version needs to be compatible with each previous protocol standard version, that is, the WLAN device supporting the PPDU of the new-generation protocol standard version needs to be able to identify the format of the PPDU of all new-generation and old-generation protocol standard versions so as to demodulate according to the corresponding format.

For example: the 802.11ax PDDU needs to be compatible with the previous 802.11a,802.11n and 802.11ac PDDUs, respectively. Fig. 2 shows part of the contents of the format of the respective PPDUs of 802.11a,802.11n, 802.11ac and 802.11 ax. As shown in fig. 2, in 802.11a, a part of contents of a format of PPDU sequentially includes: L-STF, L-LTF and L-SIG, wherein the L-SIG adopts a binary phase shift keying (binary phase shift keying, BPSK) modulation mode. In 802.11n, the partial content of the format of the PPDU sequentially includes: L-STF, L-LTF, L-SIG, HT-SIG1, HT-SIG2, high throughput short training symbol (High Throughput Legacy Short Training Field, HT-STF) and high throughput long training symbol (High Throughput Legacy Long Training Field, HT-LTF), wherein L-SIG adopts BPSK modulation mode, and HT-SIG1 and HT-SIG2 adopt QBSK modulation mode. In 802.11ac, the partial content of the format of the PPDU sequentially includes: L-STF, L-LTF, L-SIG, VHT-SIGA1, VHT-SIGA2, very high throughput short training symbols (Very High Throughput SIGnal Short Training Field, VHT-STF) and very high throughput long training symbols (Very High Throughput SIGnal Long Training Field, VHT-LTF), wherein the L-SIG and the VHT-SIGA1 adopt a BPSK modulation mode, and the VHT-SIGA2 adopts a QBSK modulation mode. In 802.11ax, the partial content of the format of the PPDU sequentially includes: L-STF, L-LTF, L-SIG, RL-SIG, HE-SIGA1, HE-SIGA2, HE-SIGB, HE-STF and HE-LTF, wherein the L-SIG, RL-SIG, HE-SIGA1, HE-SIGA2 and HE-SIGB adopt a BPSK modulation mode. For convenience of explanation, the modulation scheme of QBPSK in fig. 2 is illustrated by diagonal lines, and the modulation scheme of BPSK is illustrated by vertical lines.

As shown in connection with fig. 2, a specific process of distinguishing between 802.11a, 802.11n, 802.11ac, and 802.11ax may include:

the first symbol after the IF L-SIG is QBPSK modulation// Condition 1

The PPDU is an 802.11n PPDU

The second symbol after ELSEIF L-SIG is QBSK modulation// Condition 2

The PPDU is an 802.11ac PPDU

The first symbol after ELSEIF L-SIG is identical to L-SIG// condition 3, wherein the execution of condition 2 and condition 3 is performed in no order, i.e. condition 2 can be judged first and then condition 3 can be judged; or judging the condition 3 first and then judging the condition 2; condition 2 and condition 3 may also be judged simultaneously.

The PPDU is an 802.11ax PPDU

ELSE

The PPDU is an 802.1a PPDU

Therefore, how to format PPDUs of new generation protocol standard versions such as 802.11be so that WLAN devices can distinguish the respective protocol standard versions is a problem to be solved.

Disclosure of Invention

The application provides a transmission method, a device and a system of a physical layer protocol data unit (PPDU), so that WLAN equipment can distinguish between new and old protocol standard versions through a format of the PPDU of the set new generation protocol standard version.

In a first aspect, the present application provides a method for transmitting a physical layer protocol data unit PPDU, including:

A transmitting device obtains a PPDU, wherein the PPDU comprises a traditional information symbol L-SIG and a first symbol positioned behind the L-SIG, and the first symbol is used for representing a standard protocol version followed by the PPDU;

the transmitting device transmits the PPDU to a receiving device such that the receiving device determines a standard protocol version to which the PPDU conforms based on the first symbol.

By the transmission method of the physical layer protocol data unit PPDU provided in the first aspect, a first symbol is set after the L-SIG in the PPDU, where the first symbol may be one or more symbols, and the first symbol is used to represent a standard protocol version complied with by the PPDU, so that the transmitting device can set a PPDU that can include the first symbol that determines the standard protocol version complied with by the PPDU, and further, the receiving device determines the standard protocol version complied with by the PPDU that determines the PPDU by identifying the first symbol in the PPDU sent by the transmitting device. Based on the characteristics of the PPDU of the old standard protocol version, by means of one or more symbols (i.e. the first symbol) which are positioned behind the L-SIG in the PPDU and represent the new standard protocol version complied with by the PPDU, the format of the PPDU in the new standard protocol version can be set, so that the transmission of the PPDU is conveniently realized, the new standard protocol version complied with by the PPDU can be determined, the new standard protocol version complied with by the PPDU is facilitated to be distinguished, and the demodulation of the PPDU is conveniently realized.

In one possible design, the first symbol includes at least a first symbol located after the L-SIG, where the first symbol uses a modulation mode of quadrature binary phase shift keying QBPSK, and a value represented by at least the first 7 bits of the first symbol is in a preset range, where the preset range is different from a range greater than or equal to 0 and less than or equal to 76.

In one possible design, the preset range is 77 or more and 127 or less.

In one possible design, the preset range includes a plurality of value intervals, where values represented by at least the first 7 bits of the first symbol are different, and the PPDU is different in type in a standard protocol version to which the PPDU represented by the first symbol conforms.

In one possible design, the PPDU further includes a second symbol located after the first symbol, where the second symbol adopts a binary phase shift keying BPSK modulation mode.

Compared with the method for setting the PPDU Marker symbol by repeating the L-SIG in the prior art, in the method, the first symbol positioned behind the L-SIG is set to be the modulation mode of QBSK, and the numerical value represented by at least the first 7 bits of the first symbol is in a preset range different from the range of 0 or more and 76 or less, the PPDU of a new standard protocol version can be effectively identified by the first symbol at least comprising the first symbol positioned behind the L-SIG, meanwhile, the distinction of the PPDU of the new standard protocol version and the old standard protocol version is supported, and the method is not simple to repeat the L-SIG, the rest bits in the first symbol can be freely defined, the efficiency of identifying the PPDU is improved, and richer protocol characteristics are supported. In addition, a second symbol located after the first symbol in the PPDU may further determine a standard protocol version followed by the PPDU determined by the first symbol by using a BPSK modulation scheme. And the bits in the second symbol can also be freely defined.

In one possible design, the first symbol includes at least a first symbol located after the L-SIG, where the first symbol adopts a QBPSK modulation mode, and the value of at least the first 2 bits of the first symbol is a preset value 11.

In one possible design, the mth bit of the first symbol has a different value, and the PPDU represented by the first symbol has a different type in a standard protocol version to which the PPDU conforms, where M is a positive integer greater than 2.

Compared with the method for setting the PPDU Marker symbol by repeating the L-SIG in the prior art, in the method, the first symbol positioned behind the L-SIG is set to be the modulation mode of QBSK, the value of at least the first 2 bits of the first symbol is set to be the preset value 11, the PPDU of a new standard protocol version can be effectively identified by the first symbol at least comprising the first symbol positioned behind the L-SIG, meanwhile, the distinction of the PPDU of a new standard protocol version and an old standard protocol version is supported, the L-SIG is not simply repeated, the rest bits in the first symbol can be freely defined, the PPDU identification efficiency is improved, and richer protocol characteristics are supported. In addition, a second symbol located after the first symbol in the PPDU may further determine a standard protocol version followed by the PPDU determined by the first symbol by using a BPSK modulation scheme. And the bits in the second symbol can also be freely defined.

In one possible design, the first symbol includes at least a first symbol located after the L-SIG and at least one third symbol located after the first symbol, where the first symbol is a repeated legacy information symbol RL-SIG, and the first symbol adopts a modulation mode of quadrature binary phase shift keying BPSK; the at least one third symbol adopts a quadrature binary phase shift keying QBSK modulation mode.

In one possible design, the value and/or the represented value of at least one bit of the third symbol is different, and the type of the PPDU in the standard protocol version to which the PPDU represented by the first symbol conforms is different.

Compared with the method for setting the PPDU Marker symbol by repeating the L-SIG in the prior art, in the method, the first symbol positioned after the L-SIG is set as the repeated L-SIG, the first symbol is set as the BPSK modulation mode, and at least one third symbol positioned after the first symbol is set as the QBSK modulation mode, the PPDU of a new standard protocol version can be effectively identified through the first symbol at least comprising the first symbol positioned after the L-SIG and at least one third symbol positioned after the first symbol, meanwhile, the distinction of the PPDU of new and old standard protocol versions is supported, the robustness of the 802.11 technology on delay expansion is also reserved, and the rest bits in the third symbol can be freely subscribed, so that the PPDU identification efficiency is improved to support the richer protocol characteristics.

In one possible design, the first symbol includes at least a first symbol located after the L-SIG and at least one fourth symbol located after the first symbol, where the first symbol is a repeated legacy information symbol RL-SIG, and the first symbol and each fourth symbol use a modulation mode of quadrature binary phase shift keying BPSK; the value of at least one bit of the at least one fourth symbol is the first value, and/or the value represented by at least one bit of the at least one fourth symbol is the first value.

In one possible design, the value and/or the represented value of at least one bit of the fourth symbol is different, and the type of the PPDU in the standard protocol version to which the PPDU represented by the first symbol conforms is different.

Compared with the method for setting the PPDU Marker symbol by repeating the L-SIG in the prior art, in the method, the first symbol positioned after the L-SIG is set as the repeated L-SIG, the first symbol is set as the BPSK modulation mode, at least one fourth symbol positioned after the L-SIG is set as the BPSK modulation mode, the value of at least one bit of the at least one fourth symbol is the first value, and/or the value represented by at least one bit of the at least one fourth symbol is the first value, the PPDU of a new standard protocol version can be effectively identified by the first symbol at least comprising the first symbol positioned after the L-SIG and the at least one fourth symbol positioned after the first symbol, meanwhile, the distinction of the PPDU of the new standard protocol version and the old standard protocol version is supported, the robustness of the 802.11 technology to the delay expansion is also reserved, and the remaining bits in the fourth symbol can be freely subscribed, so that the efficiency of identifying the PPDU is improved, and the richer characteristics are supported.

In one possible design, the PPDU type includes: at least one of a Single user SU PPDU, a Multi-user MU PPDU, a Multi-access point Multi-AP PPDU, a Single access point Single-AP PPDU, a Multi-Link PPDU, a Single Link Single-Link PPDU, or an information field XX-SIG PPDU related to a standard protocol version.

In one possible design, at least one remaining bit of the first symbol, other than the bits used to represent the standard protocol version to which the PPDU conforms, is used to represent the common information field of the PPDU.

In one possible design, the common information field includes: at least one of a type field, a transmission opportunity TXOP field, a Tail field, a Color field, an uplink UL/downlink DL field of a basic service set BSS, other identifier fields, a cyclic redundancy check CRC field, or a bandwidth BW field of the PPDU, wherein the fields represent an information basic domain formed by one or more bits.

In a second aspect, the present application provides a method for transmitting a physical layer protocol data unit PPDU, including:

a receiving device receives a PPDU from a transmitting device, wherein the PPDU comprises a legacy information symbol L-SIG and a first symbol positioned after the L-SIG, and the first symbol is used for representing a standard protocol version followed by the PPDU;

The receiving apparatus determines a standard protocol version to which the PPDU conforms based on the first symbol.

By the transmission method of the physical layer protocol data unit PPDU provided in the second aspect, a first symbol is set after the L-SIG in the PPDU, where the first symbol may be one or more symbols, and the first symbol is used to represent a standard protocol version complied with by the PPDU, so that the receiving device may receive the PPDU sent by the sending device and including an identifier capable of determining the standard protocol version complied with by the PPDU, and further cause the receiving device to determine the standard protocol version complied with by the PPDU by identifying the first symbol in the PPDU. Based on the characteristics of the PPDU of the old standard protocol version, by means of one or more symbols (i.e. the first symbol) which are positioned behind the L-SIG in the PPDU and represent the new standard protocol version complied with by the PPDU, the format of the PPDU in the new standard protocol version can be set, so that the transmission of the PPDU is conveniently realized, the new standard protocol version complied with by the PPDU can be determined, the new standard protocol version complied with by the PPDU is facilitated to be distinguished, and the demodulation of the PPDU is conveniently realized.

In one possible design, when the PPDU further includes a legacy short training symbol L-STF and a legacy long training symbol L-LTF, the method further includes:

The receiving device determines the initial position of the PPDU and the position of the L-SIG in the PPDU by carrying out operation on the L-STF and the L-LTF;

the receiving device determines a position of the first symbol in the PPDU based on a starting position of the PPDU and a position of the L-SIG in the PPDU.

In one possible design, the method further comprises:

the receiving device demodulates the PPDU based on a standard protocol version to which the PPDU conforms.

In one possible design, the preset range is 77 or more and 127 or less.

In one possible design, the common information field includes: at least one of a type field, a transmission opportunity TXOP field, a Tail field, a Color field of a basic service set BSS, an uplink UL/downlink DL field, other identifier fields of the PPDU, a cyclic redundancy check CRC field, or a bandwidth BW field of the PPDU.

In a third aspect, the present application provides a transmission apparatus for a physical layer protocol data unit PPDU, including:

an obtaining module, configured to obtain a PPDU, where the PPDU includes a legacy information symbol L-SIG and a first symbol located after the L-SIG, where the first symbol is used to represent a standard protocol version to which the PPDU conforms;

And a transmitting module, configured to transmit the PPDU to a receiving device, so that the receiving device determines, based on the first symbol, a standard protocol version to which the PPDU conforms.

In one possible design, the preset range is 77 or more and 127 or less.

The advantages of the transmission device of the PPDU provided in the third aspect and the possible designs of the third aspect may be referred to the advantages brought by the foregoing first aspect and the possible implementations of the first aspect, and are not described herein again.

In a fourth aspect, the present application provides a transmission apparatus for a physical layer protocol data unit PPDU, including:

a receiving module, configured to receive a PPDU from a transmitting device, where the PPDU includes a legacy information symbol L-SIG and a first symbol located after the L-SIG, where the first symbol is used to represent a standard protocol version to which the PPDU conforms;

and a determining module, configured to determine, based on the first symbol, a standard protocol version followed by the PPDU.

In one possible design, when the PPDU further includes a conventional short training symbol L-STF and a conventional long training symbol L-LTF, the determining module is further configured to determine a starting position of the PPDU and a position of the L-SIG in the PPDU by performing an operation on the L-STF and the L-LTF; and determining the position of the first symbol in the PPDU based on the starting position of the PPDU and the position of the L-SIG in the PPDU.

In one possible design, the apparatus further comprises:

and the demodulation module is used for demodulating the PPDU based on the standard protocol version followed by the PPDU.

In one possible design, the preset range is 77 or more and 127 or less.

The advantages of the transmission device of the PPDU provided in the fourth aspect and the possible designs of the fourth aspect may be referred to the advantages brought by the possible implementations of the second aspect and the second aspect, and are not described herein.

In a fifth aspect, the present application provides a communication system comprising: the transmission apparatus of the physical layer protocol data unit PPDU provided in the third aspect and in each possible design of the third aspect and the transmission apparatus of the physical layer protocol data unit PPDU provided in each possible design of the fourth aspect and the fourth aspect.

The advantages of the communication system provided in the fifth aspect and the possible designs of the fifth aspect may be referred to the possible implementations of the third aspect and the possible implementations of the fourth aspect and the fourth aspect, and are not described herein.

In a sixth aspect, the present application provides a communication device comprising: a memory, a processor, and a transmitter;

the memory is used for storing program instructions;

the transmitter is used for transmitting the PPDU;

the processor is configured to invoke the program instructions in the memory to perform the transmission method of the PPDU in the first aspect and any possible design of the first aspect.

In a seventh aspect, the present application provides a communication device comprising: a memory, a processor, and a receiver;

The memory is used for storing program instructions;

the receiver is used for receiving the PPDU;

the processor is configured to invoke the program instructions in the memory to perform the method for transmitting the PPDU in the second aspect and any one of the possible designs of the second aspect.

In an eighth aspect, the present application provides a readable storage medium, in which an execution instruction is stored, and when the execution instruction is executed by at least one processor of the communication device, the communication device executes the transmission method of the physical layer protocol data unit PPDU in any one of the first aspect and the possible designs of the first aspect.

In a ninth aspect, the present application provides a readable storage medium, in which an execution instruction is stored, and when at least one processor of the communication device executes the execution instruction, the communication device executes the transmission method of the physical layer protocol data unit PPDU in any one of the second aspect and the possible designs of the second aspect.

In a tenth aspect, the present application provides a program product comprising execution instructions stored in a readable storage medium. The at least one processor of the communication device may read the execution instructions from the readable storage medium, the execution of the at least one processor causing the communication device to implement the transmission method of the physical layer protocol data unit PPDU in the first aspect and any one of the possible designs of the first aspect.

In an eleventh aspect, the present application provides a program product comprising execution instructions stored in a readable storage medium. The at least one processor of the communication device may read the execution instructions from the readable storage medium, the execution of the at least one processor causing the communication device to implement the second aspect and the transmission method of the physical layer protocol data unit PPDU in any one of the possible designs of the second aspect.

In a twelfth aspect, the present application provides a chip, where the chip is connected to a memory, or the chip is integrated with a memory, and when a software program stored in the memory is executed, the transmission method of the PPDU in any one of the foregoing first aspect and the possible designs of the first aspect is implemented.

In a thirteenth aspect, the present application provides a chip, where the chip is connected to a memory, or the chip is integrated with a memory, and when a software program stored in the memory is executed, the transmission method of the PPDU in any one of the second aspect and the possible designs of the second aspect is implemented.

Drawings

Fig. 1 is a schematic format diagram of a general PPDU supporting various protocol standard versions;

Fig. 2 is a schematic diagram of a portion of the content of the format of each PPDU of 802.11a, 802.11n, 802.11ac and 802.11 ax;

fig. 3 is a schematic structural diagram of a communication system according to an embodiment of the present application;

fig. 4 is a schematic hardware configuration diagram of the transmitting apparatus or the receiving apparatus in fig. 3;

fig. 5 is an interaction schematic diagram of a transmission method of a PPDU according to an embodiment of the present application;

fig. 6a is a schematic diagram of a portion of the format of a PPDU of a new protocol standard version according to an embodiment of the present application;

FIG. 6b is a schematic diagram of the format of the first symbol in FIG. 6a after the L-SIG;

FIG. 7a is a schematic illustration of the first symbol of FIG. 6b following the L-SIG;

FIG. 7b is a schematic illustration of the first symbol of FIG. 6b following the L-SIG;

FIG. 7c is a schematic illustration of the first symbol of FIG. 6b following the L-SIG;

FIG. 7d is a schematic illustration of the first symbol of FIG. 6b following the L-SIG;

FIG. 7e is a schematic illustration of the first symbol of FIG. 6b following the L-SIG;

FIG. 7f is a schematic illustration of the first symbol of FIG. 6b following the L-SIG;

FIG. 7g is a schematic illustration of the first symbol of FIG. 6b following the L-SIG;

Fig. 8a is a schematic diagram of a portion of the format of a PPDU of a new protocol standard version according to an embodiment of the present application;

FIG. 8b is a schematic diagram of the format of the first symbol in FIG. 8a after the L-SIG;

FIG. 9a is a schematic illustration of the first symbol of FIG. 8b following the L-SIG;

FIG. 9b is a schematic illustration of the first symbol of FIG. 8b following the L-SIG;

FIG. 9c is a schematic illustration of the first symbol of FIG. 8b after the L-SIG;

FIG. 9d is a schematic illustration of the first symbol of FIG. 8b following the L-SIG;

FIG. 9e is a schematic illustration of the first symbol of FIG. 8b following the L-SIG;

FIG. 9f is a schematic illustration of the first symbol of FIG. 8b following the L-SIG;

FIG. 9g is a schematic illustration of the first symbol of FIG. 8b following the L-SIG;

fig. 10a is a schematic diagram of a portion of the content of the format of a PPDU of a new protocol standard version according to an embodiment of the present application;

fig. 10b is a schematic diagram of a portion of the content of the format of a PPDU of a new protocol standard version according to an embodiment of the present application;

fig. 10c is a schematic diagram of a portion of the content of the format of a PPDU of a new protocol standard version according to an embodiment of the present application;

Fig. 10d is a schematic diagram of a portion of the content of the format of a PPDU of a new protocol standard version according to an embodiment of the present application;

FIG. 10e is a diagram illustrating the format of the third symbol in FIGS. 10 a-10 d;

FIG. 11a is a schematic diagram showing the third symbol in FIG. 10 e;

FIG. 11b is a schematic diagram showing the third symbol in FIG. 10 e;

FIG. 11c is a schematic diagram showing the third symbol in FIG. 10 e;

FIG. 11d is a schematic diagram showing the third symbol in FIG. 10 e;

FIG. 11e is a schematic diagram showing the third symbol in FIG. 10 e;

fig. 12 is a schematic diagram of a portion of the content of the format of a PPDU of a new protocol standard version according to an embodiment of the present application;

fig. 13 is a schematic structural diagram of a transmission device of a PPDU according to an embodiment of the present application;

fig. 14a is a schematic structural diagram of a transmission device of a PPDU according to an embodiment of the present application;

fig. 14b is a schematic structural diagram of a transmission device of a PPDU according to an embodiment of the present application;

fig. 15 is a schematic hardware structure of a communication device according to an embodiment of the present application.

Detailed Description

Fig. 3 shows a schematic architecture of a communication system. As shown in fig. 3, the communication system of the present application may include: a transmitting device and a receiving device.

The communication systems mentioned in this application may include, but are not limited to: narrowband internet of things (Narrow Band-Internet of Things, NB-IoT), global system for mobile communications (Global System for Mobile Communications, GSM), enhanced data rates for GSM evolution (Enhanced Data rate for GSM Evolution, EDGE), wideband code Division multiple access (Wideband Code Division Multiple Access, WCDMA), code Division multiple access 2000 (Code Division Multiple Access, CDMA 2000), time Division synchronous code Division multiple access (Time Division-Synchronization Code Division Multiple Access, TD-SCDMA), long term evolution (Long Term Evolution, LTE), 5G mobile communication systems, and next generation 6G mobile communication systems.

The transmitting device or receiving device mentioned in the present application may include, but is not limited to, a wireless access point (wireless access point, AP), which may also be referred to as an access point or bridge or hot spot in a WLAN, an optical network device (optical network terminal, ONT), a router, etc.

In addition, the receiving device or the transmitting device mentioned in the present application may also include, but is not limited to, a base station, an access network device, a Station (STA) in a WLAN, and the STA may also be referred to as a user, a wireless sensor, a wireless communication terminal, or a mobile terminal (e.g., a mobile phone and a computer with a wireless communication function). In addition, the receiving device may also be a portable, pocket, hand-held, computer-built-in, wearable or vehicle-mounted wireless communication device.

In the application, wireless and/or wired communication can be performed between the transmitting device and the receiving device, so as to realize the receiving and transmitting process of the PPDU, for example: when the transmitting apparatus is an AP, the receiving apparatus may be an AP or an STA. When the receiving device is an AP, the transmitting device may be an AP or an STA. When the transmitting apparatus is a STA, the receiving apparatus may be an AP or a STA. When the receiving device is a STA, the transmitting device may be an AP or a STA. Thereby transmitting and receiving PPDUs between the AP and the STA, between the AP and the AP, or between the STA and the STA. Wherein, the sending device and the receiving device both belong to WLAN equipment. Fig. 4 shows a schematic hardware configuration of the WALN device. As shown in fig. 4, the WLAN device may include the following modules:

a transmitter: for generating a PPDU with a compliant standard protocol version and transmitting it to the counterpart WLAN device via an antenna through a series of digital and analog signal processing procedures.

A receiver: the device is used for receiving the PPDU transmitted by the opposite-end WLAN device and can convert the radio frequency analog signal into a baseband digital signal.

A processor: necessary control is provided for the transmission and the reception of the PPDU, and the flow of the transmission and the reception is ensured to meet the necessary specification.

Digital signal processing (Digital Signal Processing DSP) device: the baseband signal is processed, and the processing may include PPDU generation, format detection, format identification, and the like.

A memory: necessary storage is provided for transmission and reception of the PPDU, and may include, but is not limited to, random access memory (random access memory, RAM), read Only Memory (ROM), and the like.

An accelerator: acceleration capabilities are provided for processing and computing of the transmission and reception of PPDUs, which may include, but are not limited to, hardware accelerators, software accelerators, AI accelerators, and the like.

An antenna: and the transmitter and the receiver are connected for transmitting and receiving radio frequency analog signals.

Where the transmitter and receiver may be combined into one module, known as a Transceiver (transmitter).

In order to solve the problem of differentiating between new and old standard protocol versions by the format of a PPDU, the present application provides a transmission method, apparatus, system, device and computer storage medium of a physical layer protocol data unit PPDU, wherein a first symbol may be set after an L-SIG located in the PPDU, where the first symbol may be one or more symbols, and is used to represent a standard protocol version to which the PPDU conforms, so that a transmitting apparatus can set a PPDU capable of determining the standard protocol version to which the PPDU conforms, and further enable a receiving apparatus to determine the standard protocol version to which the PPDU conforms by identifying the first symbol in the PPDU. Based on the characteristics of the PPDU of the old standard protocol version, by means of one or more symbols (i.e. the first symbol) which are positioned behind the L-SIG in the PPDU and represent the new standard protocol version to which the PPDU conforms, the format of the PPDU in the new standard protocol version can be set, the transmission of the PPDU is convenient, the new standard protocol version to which the PPDU conforms can be determined, the distinction between the new standard protocol version and the old standard protocol version is facilitated, and the demodulation of the PPDU is convenient.

Wherein the symbol is a basic constituent unit of the PPDU. In general, a symbol may include one or more bits (bits), and the number of bits in a symbol is not limited in this application. For example, in 802.11 technology, the number of bits in the XX-SIG may be 24 or 26.

One or more symbols may form a domain, and each domain generally uses the same coding scheme, and the number of symbols in a domain is not limited in this application. For example, in 802.11 technology, the L-STF includes two symbols and the L-SIG includes one symbol. Wherein the L-STF may be referred to as a conventional short training symbol, and may also be referred to as a conventional short training field. In addition, each domain typically represents a different function, such as: the functions of the L-STF and the L-SIG are different. The information represented by the bits in each field may be the same or different. In addition, any one of the domains may also include one or more basic domains, such as an information basic domain, etc. And one field (or information field) may be used to represent one or more bits of the information base field. That is, an information field may be an information symbol or a part of an information symbol, which may be set according to practical situations, and is not limited herein.

One or more domains may constitute a PPDU, and the number of domains in one PPDU is not limited in this application. For example, in 802.11 technology, the number of fields in the PPDU for 802.11a and the PPDU for 802.11ax may be different. The number of fields in the 802.11ax PPDU and the 802.11ac PPDU may be the same.

Next, a specific implementation procedure of the transmission method of the PPDU provided in the present application will be described with the transmitting device and the receiving device shown in fig. 3 to fig. 4 as execution bodies.

Fig. 5 is an interaction schematic diagram of a transmission method of a PPDU according to an embodiment of the present application, and as shown in fig. 5, the transmission method of the PPDU according to the present application may include:

s101, a transmitting device obtains a PPDU, wherein the PPDU comprises an L-SIG and a first symbol positioned behind the L-SIG, and the first symbol is used for representing a standard protocol version followed by the PPDU.

In the present application, the transmitting device may generate the PPDU by the transmitting device based on the difference between the PPDUs of the new and old standard protocol versions, or may obtain the PPDU from another device, which is not limited in the present application.

In the fourth generation mainstream protocol standard version of 802.11a, 802.11n, 802.11ac, 802.11ax, the format of PPDU has the following characteristics:

1. The PPDU Marker symbol is usually located at the forefront of the PPDU, and the PPDU Marker symbol is usually located one to two symbols after the L-SIG, which is favorable for the receiving device to identify the format of the PPDU as soon as possible, so as to determine the standard protocol version followed by the PPDU, thereby facilitating appropriate processing of the subsequently received signal according to the standard protocol version followed by the PPDU. The PPDU Marker symbol may include one or more symbols.

2. The LENGTH of the PPDU needs to be reserved through the RATE field and the LENGTH field in the L-SIG, so as to ensure that all WLAN devices in the standard protocol version can set the NAV according to the values set in the RATE field and the LENGTH field (the NAV can implement a mechanism for virtual carrier monitoring in the WLAN standard, specifically, the WLAN devices may receive PPDUs sent by other users in the process of monitoring channels, the WLAN devices that include the PPDU send the PPDU expect to use the time LENGTH t of the channel to bypass the WLAN devices that hear the information, and a time LENGTH t can be set, and during the time t, no signal can be sent by the WLAN devices regardless of the channel state so as not to interfere with other devices), so that the compatibility of clear channel assessment (Clear Channel Assessment, CCA) is maintained.

3. PPDU Marker symbols typically use phase rotation (e.g., BPSK or QBPSK) or field repetition, which requires an additional 1bit of information carried by an additional symbol, while QBPSK phase rotation requires no additional overhead.

Based on the above, the new standard protocol version of the PPPDU may include: the system comprises an L-SIG and a first symbol, wherein the first symbol is positioned behind the L-SIG and is used for representing a new standard protocol version followed by the PPDU, namely a PPDU Marker symbol, and the new standard protocol version refers to a standard protocol version different from an old standard protocol version (namely an existing standard protocol version). And the number and the specific content of the first symbol are not limited in this application. In addition, the PPDU may include other symbols in addition to the L-SIG and the first symbol.

The old standard protocol version is an existing standard protocol version, or a standard protocol version with PPDU Marker symbol, for example: 802.11a, 802.11n, 802.11ac, and 802.11ax. The new standard protocol version is a standard protocol version without PPDU Marker symbol, for example: 802.11be, and subsequent protocol standard versions, etc., as this application is not limited in this regard. In addition, the new standard protocol version can also be an old standard protocol version, and only the condition that the setting of the PPDU Marker symbol is different from the setting of the existing PPDU Marker symbol is required. That is, the PDDU of the old standard protocol version may also be in the format of the PDDU in the present application.

S102, the transmitting device transmits the PPDU to the receiving device.

In this application, the transmitting device may transmit a PPDU to the receiving device, where the PPDU carries a first symbol in S101 for indicating a standard protocol version to which the PPDU conforms.

The specific representation form of the PPDU is not limited in the present application, and only needs to satisfy the standard protocol version that the PPDU conforms to when supporting the PPDU.

S103, the receiving device determines a standard protocol version followed by the PPDU based on the symbol.

Based on S102, the reception apparatus may receive the PPDU from the transmission apparatus. Since the PPDU carries a first symbol, the first symbol may include at least one symbol located after the L-SIG, and the first symbol may be used to represent a standard protocol version to which the PPDU conforms. Therefore, the receiving device can determine the new standard protocol version followed by the PPDU by using the first symbol as a PPDU Marker symbol so as to distinguish between the new standard protocol version and the old standard protocol version.

The implementation manner of the receiving device to determine the first symbol is not limited in this application. Optionally, when the PPDU may further include: when the L-STF and the L-LTF are used, the receiving device can determine the starting position of the PPDU and the position of the L-SIG in the PPDU by operating the L-STF and the L-LTF, so that the receiving device can conveniently find out the position of the first symbol in the PPDU based on the starting position of the PPDU and the position of the L-SIG in the PPDU, and the standard protocol version complied with by the PPDU can be determined quickly and timely.

And S104, the receiving device demodulates the PPDU based on the standard protocol version followed by the PPDU.

S104 is optional. In this application, when determining the standard protocol version followed by the PPDU, the receiving device may obtain information of the PPDU corresponding to the standard protocol version followed by the PPDU, for example: bandwidth, modulation coding scheme, space division multiplexing scheme, frequency division multiplexing scheme, etc. to demodulate the PPDU.

According to the transmission method of the physical layer protocol data unit (PPDU), the first symbol is set after the L-SIG located in the PPDU, wherein the first symbol can comprise one or more symbols and is used for representing the standard protocol version followed by the PPDU, so that a transmitting device can set the PPDU capable of determining the standard protocol version followed by the PPDU, and a receiving device can determine the standard protocol version followed by the PPDU by identifying the symbol in the PPDU. Based on the characteristics of the PPDU of the old standard protocol version, at least one symbol which is positioned behind the L-SIG in the PPDU and indicates the new standard protocol version complied with by the PPDU can be used for setting the format of the PPDU in the new standard protocol version, so as to conveniently realize the transmission of the PPDU, and also can determine the new standard protocol version complied with by the PPDU, thereby being beneficial to distinguishing the new standard protocol version from the old standard protocol version and conveniently realizing the demodulation of the PPDU.

The technical solution of the method embodiment shown in fig. 5 will be described in detail below using several specific embodiments.

In the present application, the number of the first symbols used to indicate the standard protocol version to which the PPDU conforms may be one or more, and the present application is not limited thereto. Based on the foregoing, the specific implementation manner of the first symbol in the format of the PPDU is respectively exemplified in the following in conjunction with the first embodiment, the second embodiment, the third embodiment and the fourth embodiment.

Example 1

In the first embodiment, the first symbol may represent the standard protocol version followed by the PPDU by one or more symbols, and the first symbol may include multiple representation manners. Optionally, based on the format of the PPDUs of the existing 802.11a, 802.11n, 802.11ac, and 802.11ax, the first symbol may include at least: the first symbol after the L-SIG. That is, the first symbol may include only a first symbol located after the L-SIG, and may include a first symbol located after the L-SIG and other symbols located after the first symbol, which is not limited in this application.

Since the formats of the PPDUs of 802.11a, 802.11ac and 802.11ax respectively, the first symbol after the L-SIG adopts a BPSK modulation scheme. Therefore, the first symbol located after the L-SIG in the present application may be modulated by QBPSK to be differentiated from 802.11a, 802.11ac and 802.11ax, so that the 802.11a, 802.11ac and 802.11ax are differentiated based on the implementation procedure shown in fig. 3, which is not described herein.

Also, in 802.11n, the first symbol of the PDDU located after the L-SIG (i.e., HT-SIG 1) adopts the QBPSK modulation scheme, and the first field of the HT-SIG1 is the modulation coding scheme (Modulation and Coding Scheme, MCS), which occupies the first 7 bits (bits), and the range of values represented by the first 7 bits is [0, 76]. Accordingly, the present application can set the value represented by at least the first 7 bits of the first symbol to be within a preset range different from the range of 0 or more and 76 or less so as to be distinguished from 802.11 n. That is, at least the first 7 bits of the first symbol, i.e., PPDU identification (identifier) bits. Thus, the first symbol including at least the first symbol can distinguish the new standard protocol version from the old standard protocol version.

The specific numerical values of the preset range are not limited, and the preset range is only required to be different from the range which is more than or equal to 0 and less than or equal to 76.

In order to be compatible with more new standard protocol versions, in the present application, on the premise that the value represented by at least the first 7 bits of the first symbol meets the preset range, the values represented by 7 bits or more than 7 bits of the first symbol are different, and the standard protocol version to which the PPDU represented by the first symbol conforms is different. Alternatively, the first symbol may have a different value of the remaining bits except for the standard protocol version to which the PPDU conforms, and the PPDU represented by the first symbol may have a different standard protocol version to which the PPDU conforms. The present application is not limited to the above two implementations, and the PPDU represented by the first symbol is determined according to a standard protocol version.

For example, when the value represented by at least the first 7 bits of the first symbol is 77, the present application may determine that the standard protocol version to which the PPDU is compliant by the first symbol represents is standard protocol version a; when the value represented by at least the first 7 bits of the first symbol is 90, the present application may determine that the standard protocol version to which the first symbol represents PPDU complies is standard protocol version B. Note that, the values represented by at least the first 7 bits of the first symbol are different, and the standard protocol version to which the PPDU conforms may be the same, which is not limited in this application.

It will be understood by those skilled in the art that the types of PDDUs of the respective standard protocol versions may be different, and each standard protocol version may have a different type of PDDU, so in order to distinguish between different PPDUs, the preset range may be divided into a plurality of value intervals, where the value represented by at least the first 7 bits of the first symbol is different, and the type of PPDU in the standard protocol version to which the PPDU represented by the first symbol conforms is different.

For example, assume that the first 7 bits of the first symbol represent values within a preset range of [77, 127], the preset range including: [77, 102] and [103, 127] correspond to type 1 of PPDU and value interval [77, 102] corresponds to type 2 of PPDU. Then, when the value represented by at least the first 7 bits of the first symbol is within the value interval [77, 102], the present application may determine that the first symbol represents type 1 of PPDU in the standard protocol version to which the PPDU conforms. When the value represented by at least the first 7 bits of the first symbol is within the value interval [103, 127], the present application may determine that the first symbol represents type 2 of PPDU in the standard protocol version to which the PPDU conforms.

In addition to the above manner, the present application may also determine the type of PPDU in the standard protocol version to which the PPDU is compliant by using the value and/or the represented numerical value of the remaining one or more bits in the first symbol other than the standard protocol version to which the PPDU is compliant, which is not limited in this application.

The type of PPDU is not limited in this application. Alternatively, the type of PPDU may include: a Single User (SU) PPDU, a Multi User (MU) PPDU, a Multi access point (Multi-AP) PPDU, a Single access point (Single-AP) PPDU, a Multi-Link (Multi-Link) PPDU, a Single Link (Single-Link) PPDU, or an XX-SIG PPDU of e.g. 20M or 40M or other numerical value size, wherein XX-SIG represents an information field related to a format of a standard protocol version, such as HT-SIG, VHT-SIG, HE-SIG or EHT-SIG, etc., wherein the field represents an information base field composed of one or more bits.

Based on the above, the transmitting apparatus or the receiving apparatus of the present application may obtain the format of PPDU as shown in fig. 6 a. For ease of illustration, in fig. 6a, the format of the PPDU of the present application is illustrated as a PPDU of a new standard protocol version, and the first symbol in the PPDU includes a symbol.

As shown in fig. 6a, in this application, part of the content of the format of the PPDU of the new standard protocol version may sequentially include: L-STF, L-LTF, L-SIG and XX information symbol (XX SIGal, XX-SIG) A0, wherein XX-SIG A0 is the first symbol located behind L-SIG, and XX-SIG A0 adopts QBSK modulation mode, i.e. the first symbol is XX-SIG A0.

One skilled in the art will appreciate that in 802.11 technology, one SIG typically includes 24 or 26 bits. Therefore, as shown in fig. 6b, at least the first 7 bits are adopted as PPDU identifier bits in 24 bits of XX-SIG A0, and the values represented by at least the first 7 bits are set to be within a preset range, and the preset range is different from a range of 0 or more and 76 or less, so as to achieve the purpose of using XX-SIG A0 as a PPDU Marker symbol. In fig. 6b, the values indicated by the first 7 bits of XX-SIG A0 are set within a preset range of 77 or more and 127 or less by way of example.

Based on the foregoing, in connection with fig. 3, 6a and 6b, the specific process of distinguishing between 802.11a, 802.11n, 802.11ac, 802.11ax and new standard protocol versions may include:

the first symbol after the IF L-SIG is BPSK modulation// Condition 4

The PPDU is a PPDU of 802.11a/802.11ac/802.11ax (distinguished by performing condition 2 and condition 3 in FIG. 3, and will not be described here in detail)

The first 7 bits of the first symbol after ELSEIF L-SIG represent a value within [0, 76 ]// Condition 5

The PPDU is an 802.11n PPDU

ELSE

The PPDU is a new standard protocol version PPDU

In addition to the above, the condition 4 may be replaced by a modulation scheme in which the first symbol after the L-SIG is QBPSK, the condition 5 may be replaced by a modulation scheme in which the first 7 bits of the first symbol after the L-SIG represent values within [77, 127], and the two modes of the condition 4 and the two modes of the condition 5 may be arbitrarily combined, which is not limited in this application.

In summary, the first symbol QBPSK phase rotation after the L-SIG in the PPDU of the present application is distinguished from the PPDUs of 802.11a, 802.11ac, and 802.11ax, and the value represented by at least the first 7 bits of the first symbol after the L-SIG is located in a preset range different from the range of 0 or more and 76 or less, and the first symbol at least includes the first symbol after the L-SIG to distinguish the PPDUs from the PPDUs of 802.11n, so as to achieve the purpose of identifying the format of the PPDUs of the standard version of the new generation protocol.

Based on the foregoing, to further ensure the accuracy of the protocol standard version to which the PPDU is compliant as determined by the first symbol, the PPDU Marker symbol may also use other symbols in addition to the first symbol to represent the protocol standard version to which the PDDU is compliant.

Because of the format of the PPDU of 802.11n, the second symbol located after the L-SIG adopts QBPSK modulation. Thus, optionally, in this application, the PPDU may further include: and a second symbol positioned after the first symbol, wherein the second symbol adopts a BPSK modulation mode. Thus, further distinguishing from 802.11n, the accuracy of the protocol standard version followed by the PPDU determined by the first symbol is ensured.

The specific content of the second symbol is not limited in this application. For example, when the first symbol includes only a first symbol located after the L-SIG, the second symbol may be a second symbol located after the L-SIG. For convenience of explanation, with continued reference to fig. 6a, the second symbol is XX-SIG A1 in fig. 6a, where XX-SIG A1 adopts a BPSK modulation mode, so as to be further distinguished from an 802.11n PPDU, so as to ensure accuracy of a protocol standard version to which the PDDU determined by the first symbol conforms.

With continued reference to fig. 6b, the present application may use the remaining one or more bits of the first symbol (i.e., XX-SIG A0) other than the bits used to represent the standard protocol version to which the PPDU conforms, to represent a common information field (COM-SIG) of the PPDU for providing related information of the PPDU.

The specific content of the public information field is not limited in this application. Alternatively, the common information field may include: at least one of a type (type) field of the PPDU, a transmission opportunity (transmission opportunity, TXOP) field, a Tail (Tail) field, a Color (Color) field of a basic service set (Basic Service Set, BSS), an Uplink (UL)/DownLink (DL) field, other identification (identifier) field of the PPDU, a cyclic redundancy check (cyclic redundancy check, CRC) field, or a BandWidth (BW) field. In addition, the bits of the second symbol may also be used to represent common information of the PPDU, and specific implementation manners of the second symbol and the first symbol may be the same or different, which is not limited in this application.

In a specific embodiment, if the first 7 bits of XX-SIG A0 are used as PPDU identifier bits and the preset range is equal to or greater than 77 and equal to or less than 127, then 7 possible implementations are used to exemplify the specific contents of XX-SIG A0 in conjunction with fig. 7 a-7 g.

As shown in fig. 7a, XX-SIG A0 may include, in order from LSB to MSB: PPDU identifier bits (7 bits total from 0 th to 6 th), PPDU type bits (4 bits total from 7 th to 10 th), TXOP bits (7 bits total from 11 th to 17 th) and Tail bits (6 bits total from 18 th to 23 th).

As shown in fig. 7b, XX-SIG A0 may include, in order from LSB to MSB: PPDU identifier bits (from bit 0 to bit 6, 7 bits total), PPDU type bits (from bit 7 to bit 11, 5 total), BSS Color bits (from bit 12 to bit 17, 6 total) and Tail bits (from bit 18 to bit 23, 6 total).

As shown in fig. 7c, XX-SIG A0 may include, in order from LSB to MSB: PPDU identifier bits (from bit 0 to bit 6, total of 7 bits), BSS Color bits (from bit 7 to bit 12, total of 6 bits), UL/DL bits (from bit 13, total of 1 bit), CRC bits (from bit 14 to bit 17, total of 4 bits), and Tail bits (from bit 18 to bit 23, total of 6 bits).

As shown in fig. 7d, XX-SIG A0 may include, in order from LSB to MSB: PPDU identifier bits (7 bits total from 0 th to 6 th), TXOP bits (7 bits total from 7 th to 13 th), CRC bits (4 bits total from 14 th to 17 th), and Tail bits (6 total from 18 th to 23 th).

As shown in fig. 7e, XX-SIG A0 may include, in order from LSB to MSB: PPDU identifier bits (from bit 0 to bit 6, total of 7 bits), BSS Color bits (from bit 7 to bit 12, total of 6 bits), BW bits (from bit 13 to bit 14, total of 2 bits), UL/DL bits (15 bits, total of 1 bit), PPDU type bits (from bit 16 to bit 19, total of 4 bits), and CRC bits (from bit 20 to bit 23, total of 4 bits).

As shown in fig. 7f, XX-SIG A0 may include, in order from LSB to MSB: PPDU identifier bits (7 bits total from 0 th to 6 th), TXOP bits (7 bits total from 7 th to 13 th), BSS Color bits (6 bits total from 14 th to 19 th), and CRC bits (4 bits total from 20 th to 23 th).

As shown in fig. 7g, XX-SIG A0 may include, in order from LSB to MSB: PPDU identifier bits (from bit 0 to bit 6, 7 total), BSS Color bits (from bit 7 to bit 12, 6 total), TXOP bits (from bit 13 to bit 19, 7 total) and CRC bits (from bit 20 to bit 23, 4 total).

The specific implementation of XX-SIG A0 is not limited to the above.

Compared with the method for setting the PPDU Marker symbol by repeating the L-SIG in the prior art, in the method, the first symbol positioned behind the L-SIG is set to be the modulation mode of QBSK, and the numerical value represented by at least the first 7 bits of the first symbol is in a preset range different from the range of 0 or more and 76 or less, the PPDU of a new standard protocol version can be effectively identified by the first symbol at least comprising the first symbol positioned behind the L-SIG, meanwhile, the distinction of the PPDU of the new standard protocol version and the old standard protocol version is supported, and the method is not simple to repeat the L-SIG, the rest bits in the first symbol can be freely defined, the efficiency of identifying the PPDU is improved, and richer protocol characteristics are supported.

Example two

In the second embodiment, the first symbol may represent the standard protocol version followed by the PPDU by one or more symbols, and the first symbol may include multiple representation manners. Optionally, based on the format of the PPDUs of the existing 802.11a, 802.11n, 802.11ac, and 802.11ax, the first symbol may include at least: the first symbol after the L-SIG. That is, the first symbol may include only a first symbol located after the L-SIG, and may include a first symbol located after the L-SIG and other symbols located after the first symbol, which is not limited in this application.

In 802.11n, the first symbol (i.e. HT-SIG 1) of the PDDU located after the L-SIG adopts the QBPSK modulation scheme, and the first field of HE-SIG1 is the modulation coding scheme (Modulation and Coding Scheme, MCS), which occupies the first 7 bits (bits), and the value of the first 7 bits is [0000000, 1001100]. Thus, the present application may set the value of at least the first 2 bits of the first symbol to be a preset value of 11, so as to be distinguishable from 802.11 n. That is, at least the first 7 bits of the first symbol are PPDU identifier bits. Thus, the first symbol including at least the first symbol can distinguish the new standard protocol version from the old standard protocol version.

The application can use 2 bits or more than 2 bits of the first symbol to represent the standard protocol version followed by the PPDU, and only the value meeting the first 2 bits is required to be the preset value 11. For example, when the first 2 bits of the first symbol have a preset value of 11, the present application may determine that the first symbol represents the standard protocol version to which the PPDU conforms.

In order to be compatible with more new standard protocol versions, in the present application, based on the first 2 bits of the first symbol being a preset value 11, starting from the third bit of the first symbol, the N-th bit of the first symbol is different, the standard protocol version followed by the PPDU represented by the first symbol is different, and N is a positive integer greater than 2. Alternatively, the bits of the first symbol may represent different values, and the PPDU represented by the first symbol may represent different versions of the standard protocol followed by the PPDU. The present application is not limited to the above two implementations, and the PPDU represented by the first symbol is determined according to a standard protocol version.

For example, when the value of the 3 rd bit of the first symbol is 0, the standard protocol version to which the PPDU conforms is the standard protocol version a; when the value of the 3 rd bit of the first symbol is 1, the standard protocol version to which the PPDU conforms is the standard protocol version B. The value of the mth bit of the first symbol is different from the third bit of the first symbol, and the standard protocol version to which the PPDU conforms may be the same, which is not limited in this application.

It will be appreciated by those skilled in the art that the types of PDDUs of the respective standard protocol versions may be different, and each standard protocol version may have a different type of PDDU, so in order to distinguish between different PPDUs, the present application may start with the third bit of the first symbol, where the value of the mth bit of the first symbol is different, and where the PPDU represented by the first symbol is different in the type of PPDU in the standard protocol version to which the PPDU conforms, where M is a positive integer greater than 2.

For example, assume that the first 2 bits of the first symbol have a preset value of 11, the 3 rd bit of the first symbol has a value of 1 corresponding to the type 1 of the PPDU, and the 3 rd bit of the first symbol has a value of 0 corresponding to the type 2 of the PPDU. Then, when the 3 rd bit of the first symbol takes a value of 1, the present application may determine that the first symbol represents type 1 of PPDU in the standard protocol version to which the PPDU conforms. When the 3 rd bit of the first symbol takes a value of 0, the present application may determine type 2 of PPDU in the standard protocol version to which the PPDU represented by the first symbol conforms.

In addition to the above manner, the present application may determine the type of PPDU in the standard protocol version to which the PPDU is compliant, which is indicated by the first symbol, by using the value and/or the indicated value of one or more bits remaining from the first symbol, which are other than the standard protocol version to which the PPDU is compliant.

The type of PPDU is not limited in this application. Alternatively, the type of PPDU may include: at least one of a Single User (SU) PPDU, a Multi User (MU) PPDU, a Multi access point (Multi-AP) PPDU, a Single access point (Single-AP) PPDU, a Multi-Link PPDU, a Single Link PPDU, or an XX-SIG PPDU such as 20M or 40M or other numerical values.

Based on the above, the transmitting apparatus or the receiving apparatus of the present application may obtain the format of PPDU as shown in fig. 8 a. For ease of illustration, in fig. 8a, the format of the PPDU of the present application is illustrated as a PPDU of a new standard protocol version, and the first symbol in the PPDU includes a symbol.

As shown in fig. 8a, in this application, part of the content of the format of the PPDU of the new standard protocol version may sequentially include: L-STF, L-LTF, L-SIG and XX-SIG A0, wherein XX-SIG A0 is the first symbol located behind L-SIG, XX-SIG A0 adopts QBSK modulation mode, namely the first symbol is XX-SIG A0.

One skilled in the art will appreciate that in 802.11 technology, one SIG typically includes 24 or 26 bits. Therefore, as shown in fig. 8b, at least the first 2 bits are adopted as PPDU identifier bits in 24 bits of XX-SIG A0, and the value of at least the first 2 bits is a preset value 11, so as to achieve the purpose of taking XX-SIG A0 as a PPDU Marker symbol. In FIG. 8b, the first 2 bits of XX-SIG A0 are exemplified by the preset value 11.

Based on the foregoing, in connection with fig. 3, 8a and 8b, the specific process of distinguishing between 802.11a, 802.11n, 802.11ac, 802.11ax and new standard protocol versions may include:

the first symbol after the IF L-SIG is BPSK modulation// Condition 6

The first 2 bits of the first symbol after ELSEIF L-SIG have a value other than 11// Condition 7

The PPDU is an 802.11n PPDU

ELSE

The PPDU is a new standard protocol version PPDU

In addition to the above, the condition 6 may be replaced by a modulation scheme in which the first symbol after the L-SIG is QBPSK, the condition 7 may be replaced by a modulation scheme in which the first 2 bits of the first symbol after the L-SIG is 11, and the two modes of the condition 6 may be arbitrarily combined with the two modes of the condition 7, which is not limited in this application.

In summary, the first symbol QBPSK phase rotation after the L-SIG in the PPDU of the present application is distinguished from the PPDUs of 802.11a, 802.11ac, and 802.11ax, and then the first symbol at least contains the first symbol after the L-SIG by using the value of at least the first 2 bits after the L-SIG as the preset value 11, so as to distinguish the PPDUs of 802.11n, thereby achieving the purpose of identifying the format of the PPDUs of the standard version of the new-generation protocol.

The specific content of the second symbol is not limited in this application. For example, when the first symbol includes only a first symbol located after the L-SIG, the second symbol may be a second symbol located after the L-SIG. For convenience of explanation, with continued reference to fig. 7a, the second symbol is XX-SIG A1 in fig. 7a, where XX-SIG A1 adopts a BPSK modulation mode, so as to be further distinguished from an 802.11n PPDU, so as to ensure accuracy of a protocol standard version to which the PDDU determined by the first symbol conforms.

With continued reference to fig. 7b, the present application may use the remaining one or more bits of the first symbol (i.e., XX-SIG A0) other than the bits used to represent the standard protocol version to which the PPDU conforms, to represent a common information field (COM-SIG) of the PPDU for providing related information of the PPDU.

The specific content of the public information field is not limited in this application, and optionally, the public information field may include: at least one of a type (type) field of the PPDU, a transmission opportunity (transmission opportunity, TXOP) field, a Tail (Tail) field, a Color (Color) field of a basic service set (Basic Service Set, BSS), an Uplink (UL)/DownLink (DL) field, other identification (identifier) field of the PPDU, a cyclic redundancy check (cyclic redundancy check, CRC) field, or a BandWidth (BW) field. In addition, the bits of the second symbol may also be used to represent common information of the PPDU, and specific implementation manners of the second symbol and the first symbol may be the same or different, which is not limited in this application.

In a specific embodiment, if the first 2 bits of XX-SIG A0 are PPDU identifier bits and the first 2 bits are preset values of 11, 7 possible implementations are used below to exemplify the specific contents of XX-SIG A0 in conjunction with fig. 9 a-9 g.

As shown in fig. 9a, XX-SIG A0 may include, in order from LSB to MSB: PPDU identifier bits (2 bits total from 0 th to 1 st bits), other identifier bits of PPDU (5 bits total from 2 nd to 6 th bits), PPDU type bits (5 bits total from 7 th to 11 th bits), BSS Color bits (6 bits total from 12 th to 17 th bits) and Tail bits (6 total from 18 th to 23 th bits).

As shown in fig. 9b, XX-SIG A0 may include, in order from LSB to MSB: PPDU identifier bits (2 bits total from 0 th to 1 st bits), other identifier bits of PPDU (5 bits total from 2 nd to 6 th bits), PPDU type bits (4 bits total from 7 th to 10 th bits), TXOP bits (7 bits total from 11 th to 17 th bits total) and Tail bits (6 bits total from 18 th to 23 th bits total).

As shown in fig. 9c, XX-SIG A0 may include, in order from LSB to MSB: PPDU identifier bits (2 bits total from 0 th to 1 st bits), other identifier bits of PPDU (5 bits total from 2 nd to 6 th bits), BSS Color bits (6 total from 7 th to 12 th bits), UL/DL bits (1 total from 13 th bits), CRC bits (4 total from 14 th to 17 th bits) and Tail bits (6 total from 18 th to 23 th bits).

As shown in fig. 9d, XX-SIG A0 may include, in order from LSB to MSB: PPDU identifier bits (2 bits total from 0 th to 1 st bits), other identifier bits of PPDU (5 bits total from 2 nd to 6 th bits), TXOP bits (7 th to 13 th bits total), CRC bits (14 th to 17 th bits total 4 bits total) and Tail bits (18 th to 23 th bits total 6 bits total).

As shown in fig. 9e, XX-SIG A0 may include, in order from LSB to MSB: PPDU identifier bits (2 bits total from 0 th to 1 st bits), other identifier bits of PPDU (3 bits total from 2 nd to 4 th bits), TXOP bits (7 total bits total from 5 th to 11 th bits), BSS Color bits (12 th to 17 th bits total 6 total bits) and Tail bits (18 th to 23 th bits total 6 total bits).

As shown in fig. 9f, XX-SIG A0 may include, in order from LSB to MSB: PPDU identifier bits (2 bits total from 0 th to 1 st bits), other identifier bits of PPDU (3 bits total from 2 nd to 4 th bits), TXOP bits (7 total from 5 th to 11 th bits), BW bits (2 total bits total from 12 th to 13 th bits), CRC bits (14 total to 17 th bits total 4 bits total) and Tail bits (18 total to 23 th bits total 6 bits total).

As shown in fig. 9g, XX-SIG A0 may include, in order from LSB to MSB: PPDU identifier bits (2 bits total from 0 th to 1 st bits), other identifier bits of PPDU (3 bits total from 2 nd to 4 th bits), BSS Color bits (6 total bits total from 5 th to 10 th bits), UL/DL bits (11 th to 1 total bits), BW bits (12 th to 13 th bits total 2 total bits), CRC bits (14 th to 17 th bits total 4 total bits total) and Tail bits (18 th to 23 th bits total 6 total bits).

The specific implementation of XX-SIG A0 is not limited to the above.

Compared with the method for setting the PPDU Marker symbol by repeating the L-SIG in the prior art, in the method, the first symbol positioned behind the L-SIG is set to be the modulation mode of QBSK, the value of at least the first 2 bits of the first symbol is set to be the preset value 11, the PPDU of a new standard protocol version can be effectively identified by the first symbol at least comprising the first symbol positioned behind the L-SIG, meanwhile, the distinction of the PPDU of a new standard protocol version and an old standard protocol version is supported, the L-SIG is not simply repeated, the rest bits in the first symbol can be freely defined, the PPDU identification efficiency is improved, and richer protocol characteristics are supported.

Example III

In the third embodiment, the first symbol may represent the standard protocol version followed by the PPDU by using a plurality of symbols, and the first symbol may include a plurality of representation manners. Optionally, based on the format of the PPDUs of the existing 802.11a, 802.11n, 802.11ac, and 802.11ax, the first symbol may include at least: a first symbol located after the L-SIG, and one or more third symbols located after the first symbol, wherein the first symbol is a repeated Legacy information symbol (RL-SIG), the first symbol adopts a BPSK modulation scheme, and the one or more third symbols adopt a QBPSK modulation scheme. That is, the first symbol may include only a first symbol and a second symbol located after the L-SIG, and may include a first symbol located after the L-SIG and a plurality of symbols located after the first symbol, which is not limited in this application.

Since the formats of the PPDUs of 802.11a, 802.11ac and 802.11ax respectively, the first symbol after the L-SIG adopts a BPSK modulation scheme. In the format of the PPDU of 802.11n, the first symbol located after the L-SIG adopts QBPSK modulation. Thus, the first symbol following the L-SIG in this application may be modulated with BPSK to distinguish it from 802.11 n.

Also, because of the format of the respective PPDUs of 802.11a, 802.11ac, the first symbol following the L-SIG is not a repeated L-SIG (i.e., RL-SIG). In the format of an 802.11ax PPDU, the first symbol following the L-SIG is a repeated L-SIG. Thus, the first symbol after the L-SIG in this application may be set as the RL-SIG to distinguish from the 802.11a and 802.11ac symbols, and based on what is shown in FIG. 3, the second symbol after the L-SIG may be modulated by QBSK to distinguish the 802.11a from the 802.11ac symbols.

In the format of the PPDU of 802.11ax, the second symbol, the third symbol and the fourth symbol located after the L-SIG use BPSK modulation. Thus, one or more third symbols located after the first symbol in the present application may use QBPSK modulation to be distinguished from 802.11 ax. Thus, the first symbol including at least the first symbol and at least one second symbol can distinguish the new standard protocol version from the old standard protocol version.

The specific content of the third symbol located after the first symbol is not limited in this application. In order to be compatible with more new standard protocol versions, in the present application, the value and/or the represented value of one or more bits of at least one third symbol are different, and the standard protocol version to which the PPDU represented by the first symbol conforms is different.

For example, assume that the first 4 bits of any one third symbol have a value of 0000 corresponding to the standard protocol version a compliant with the PPDU, and the first 4 bits of any one third symbol have a value of 0001 corresponding to the standard protocol version B compliant with the PPDU. Then, when the first 4 bits of any one of the third symbols have a value of 0000, the present application may determine that the first symbol represents the standard protocol version a to which the PPDU conforms. When the first 4 bits of any one of the third symbols have a value of 0001, the present application may determine that the first symbol represents the standard protocol version B to which the PPDU conforms.

It will be appreciated by those skilled in the art that the types of PDDUs may be different for each standard protocol version, and each standard protocol version may have a different type of PDDU, so that in order to distinguish between different PPDUs types, in this application, the value and/or the value represented by one or more bits in the at least one third symbol is different, and the type of PPDU in the standard protocol version to which the PPDU represented by the first symbol conforms is different. That is, at least one bit has a different value, and the PPDU has a different type. Alternatively, the values represented by at least one bit are different, and the PPDU type is different. Or, the value of at least one bit and the indicated value are different, and the type of the PPDU is different. The above process may refer to the content of determining the type of PPDU in the first embodiment and the second embodiment, and the specific working principle is similar, which is not described herein.

Based on the above, the transmitting apparatus or the receiving apparatus of the present application may obtain the format of PPDU as shown in fig. 10a to 10 d. For ease of illustration, the format of the PPDU of the present application is illustrated in fig. 10 a-10 d as a PPDU of a new standard protocol version.

When the first symbol in the PPDU includes two third symbols, as shown in fig. 10a to 10d, in this application, part of the content of the format of the PPDU of the new standard protocol version may sequentially include: L-STF, L-LTF, L-SIG, RL-SIG, XX-SIG A0 and XX-SIG A1, wherein, RL-SIG is repeated L-SIG, RL-SIG adopts BPSK modulation mode, RL-SIG is the first symbol positioned behind L-SIG, XX-SIG A0 and XX-SIG A1 are two third symbols positioned behind the first symbol, namely, the first symbol comprises: RL-SIG, XX-SIG A0 and XX-SIG A1.

When the first symbol in the PPDU includes a third symbol, in fig. 10a, XX-SIG A0 and XX-SIG A1 each use QBPSK modulation. In FIG. 10b, XX-SIG A0 adopts QBSK modulation, and XX-SIG A1 adopts BPSK modulation. In FIG. 10c, XX-SIG A0 adopts a BPSK modulation scheme, and XX-SIG A1 adopts a QBSK modulation scheme.

As shown in fig. 10d, in this application, part of the content of the format of the PPDU of the new standard protocol version may sequentially include: L-STF, L-LTF, L-SIG, RL-SIG and XX-SIG A0, wherein, RL-SIG is repeated L-SIG, RL-SIG adopts BPSK modulation mode, RL-SIG is the first symbol positioned behind L-SIG, XX-SIG A0 adopts QBSK modulation mode, XX-SIG A0 is a third symbol positioned behind the first symbol, namely, the first coincidence comprises: RL-SIG in and XX-SIG A0.

One skilled in the art will appreciate that in 802.11 technology, one SIG typically includes 24 or 26 bits. Therefore, as shown in FIG. 10e, among 24 bits of XX-SIG A0 and/or XX-SIG A1, the first 4 bits are taken as PPDU identifier bits for illustration, so as to achieve the purpose of taking XX-SIG A0 and/or XX-SIG A1 as PPDU Marker symbols.

Based on the foregoing, in connection with fig. 10 a-10 d and 10e, the specific process of distinguishing between 802.11a, 802.11n, 802.11ac, 802.11ax and new standard protocol versions may include:

The first symbol after the IF L-SIG is BPSK modulation// Condition 8

The PPDU is an 802.11a/802.11ac/802.11 ax/new standard protocol version PPDU (distinguished by performing condition 2 and condition 3 in FIG. 3, and will not be described here

The first symbol after the IF L-SIG is not RL-SIG// condition 9

The PPDU is an 802.11a/802.11ac PPDU

Modulation scheme/condition 10 where the second symbol after the IF L-SIG is QBPSK

The PPDU is an 802.11ac PPDU

ELSE

The PPDU is an 802.11a PPDU

Modulation scheme// condition 11 where at least one of the second symbol and the third symbol after ELSEIF L-SIG is QBPSK

The PPDU is a new standard protocol version PPDU

ELSE

The PPDU is an 802.11ax PPDU

ELSE

The PPDU is an 802.11n PPDU

In addition to the above, the condition 8 may be replaced with a modulation scheme in which the first symbol after the L-SIG is QBPSK, the condition 9 may be replaced with a modulation scheme in which the first symbol after the L-SIG is RL-SIG, the condition 10 may be replaced with a modulation scheme in which the second symbol after the L-SIG is BPSK, the condition 11 may be replaced with a modulation scheme in which both the second symbol after the L-SIG and the third symbol after the L-SIG are BPSK, and the two modes of the condition 8, the two modes of the condition 9, the two modes of the condition 10, and the two modes of the condition 11 may be arbitrarily combined, which is not limited in this application.

In summary, the first symbol BPSK phase rotation after the L-SIG in the PPDU of the present application, the first symbol is set as a repeated L-SIG, and at least one third symbol QBPSK phase rotation after the first symbol in the PPDU can be distinguished from the PPDUs of 802.11a, 802.11ac, 802.11n, and 802.11ax, so as to achieve the purpose of identifying the format of the PPDUs of the standard version of the new generation protocol.

With continued reference to fig. 10e, the present application may use one or more bits of at least one third symbol (i.e., XX-SIG A0 and/or XX-SIG A1) located after the first symbol, except for bits used to represent a standard protocol version to which the PPDU conforms, to a common information field (COM-SIG) used to represent the PPDU, for providing related information of the PPDU.

The specific content of the public information field is not limited in this application, and optionally, the public information field may include: at least one of a type (type) field of the PPDU, a transmission opportunity (transmission opportunity, TXOP) field, a Tail (Tail) field, a Color (Color) field of a basic service set (Basic Service Set, BSS), an Uplink (UL)/DownLink (DL) field, other identification (identifier) field of the PPDU, a cyclic redundancy check (cyclic redundancy check, CRC) field, or a BandWidth (BW) field.

In a specific embodiment, if the first 4 bits of XX-SIG A0 and/or XX-SIG A1 are used as PPDU identifier bits, then the specific contents of XX-SIG A0 and/or XX-SIG A1 are exemplified below with 5 possible implementations in connection with FIGS. 11 a-11 e.

As shown in fig. 11a, XX-SIG A0 and/or XX-SIG A1 may include, in order from LSB to MSB: PPDU identifier bits (4 th to 3 rd bits), TXOPs (7 th to 10 th bits), BSS Color bits (6 th to 11 th bits), UL/DL bits (17 th to 1 st bits), and Tail bits (6 th to 18 th bits).

As shown in fig. 11b, XX-SIG A0 and/or XX-SIG A1 may sequentially include, in order from LSB to MSB: PPDU identifier bits (4 th to 3 rd bits), TXOPs (7 th to 10 th bits), BSS Color bits (6 th to 11 th bits), UL/DL bits (17 th to 1 st bits), and CRC bits (6 th to 18 th bits).

As shown in fig. 11c, XX-SIG A0 and/or XX-SIG A1 may include, in order from LSB to MSB: PPDU identifier bits (4 th to 3 rd bits total), TXOPs (7 th to 10 th bits total), BSS Color bits (11 th to 16 th bits total 6 bits total), UL/DL bits (17 th to 1 st bits total), BW bits (18 th to 19 th bits total 2 nd bits total), and CRC bits (20 th to 23 th bits total 4 bits total).

As shown in fig. 11d, XX-SIG A0 and/or XX-SIG A1 may sequentially include, in order from LSB to MSB: PPDU identifier bits (from 0 th bit to 3 rd bit, 4 th bits total), BSS Color (from 4 th bit to 9 th bit, 6 th bits total), BW bits (from 10 th bit to 11 th bit, 2 nd bits total), UL/DL bits (12 th bit, 1 st bit total), R bits (13 th bit, 1 st bit total), CRC bits (14 th bit to 17 th bit, 4 th bits total), and Tail bits (18 th bit to 23 rd bit, 6 th bit total).

As shown in fig. 11e, XX-SIG A0 and/or XX-SIG A1 may sequentially include, in order from LSB to MSB: PPDU identifier bits (4 th to 3 rd bits total), TXOPs (7 th to 10 th bits total), BW bits (11 th to 12 th bits total 2 bits total), UL/DL bits (13 th to 1 st bits total), CRC bits (14 th to 17 th bits total 4 bits total) and Tail bits (18 th to 23 th bits total 6 bits total).

It should be noted that the specific implementation manners of the XX-SIG A0 and/or XX-SIG A1 are not limited to the above manner, and that the specific implementation manners of the XX-SIG A0 and XX-SIG A1 may be the same or different, which is not limited in this application.

Compared with the method for setting the PPDU Marker symbol by repeating the L-SIG in the prior art, in the method, the first symbol positioned after the L-SIG is set as the repeated L-SIG, the first symbol is set as the modulation mode of BPSK, and at least one third symbol positioned after the first symbol is set as the modulation mode of QBSK, and the PPDU of a new standard protocol version can be effectively identified through the first symbol at least comprising the first symbol positioned after the L-SIG and the at least one third symbol positioned after the first symbol, meanwhile, the distinction of the PPDU of new and old standard protocol versions is supported, the robustness of the 802.11 technology on delay expansion is also reserved, and the rest bits in the at least one third symbol can be freely subscribed, so that the efficiency of identifying the PPDU is improved, and the richer protocol characteristics are supported.

Example IV

In the fourth embodiment, as in the third embodiment, the first symbol may include at least: a first symbol located after the L-SIG and at least one fourth symbol located after the first symbol, the first symbol being a repeated Legacy information symbol (RL-SIG), and the first symbol being a BPSK modulation scheme. Unlike the third embodiment, each fourth symbol adopts a BPSK modulation mode, and the value of at least one bit of at least one fourth symbol is the first value, and/or the value represented by at least one bit of at least one fourth symbol is the first value. That is, the first symbol may include only a first symbol and a second symbol located after the L-SIG, and may include a first symbol located after the L-SIG and a plurality of symbols located after the first symbol, which is not limited in this application.

In the format of the PPDU of 802.11ax, the second symbol, the third symbol and the fourth symbol located after the L-SIG use BPSK modulation. In this application, the value of the bit of the at least one fourth symbol and/or the represented value are set by means of the implementation manner of the first and/or second embodiment. That is, the present application may set the value of one or more bits of the at least one fourth symbol to the first value and/or set the value represented by the one or more bits of the at least one fourth symbol to the first value, thereby being distinguished from 802.11 ax.

The specific size of the first value is not limited, and only the first value is required to be different from the value of the bit in the corresponding symbol in 802.11 ax. Such as: the present application may be based on the value of the unusual bit in 802.11ax as the first value. The specific size of the first numerical value is not limited, and the first numerical value is only required to be different from the numerical value represented by the corresponding symbol in 802.11 ax. Such as: the present application may be based on the value represented by the unusual bit in 802.11ax as the first value.

In addition, the application may also use the value of the bit of the fourth symbol or symbols and/or the represented value to represent the standard protocol version followed by the PPDU, and the specific process may refer to the description of the first embodiment and the second embodiment, which are not repeated herein.

It will be understood by those skilled in the art that the types of PDDUs of the respective standard protocol versions may be different, and each standard protocol version may have a different type of PDDU, so in order to distinguish between different types of PPDUs, in this application, the value and/or the represented value of one or more bits in the at least one fourth symbol are different, and the type of PPDU in the standard protocol version to which the PPDU represented by the first symbol conforms is different, which will be described in detail in reference to the third embodiment.

Based on the above, the transmitting apparatus or the receiving apparatus of the present application can obtain the format of PPDU as shown in fig. 12. For convenience of explanation, in fig. 12, the format of the PPDU of the present application is exemplified as a PPDU of a new standard protocol version, and when the first symbol in the PPDU includes two fourth symbols.

As shown in fig. 12, in this application, part of the content of the format of the PPDU of the new standard protocol version may sequentially include: L-STF, L-LTF, L-SIG, RL-SIG, XX-SIG A0 and XX-SIG A1, wherein, RL-SIG is a repeated L-SIG, RL-SIG, XX-SIG A0 and XX-SIG A1 all adopt BPSK modulation mode, RL-SIG is a first symbol positioned behind L-SIG, XX-SIG A0 and XX-SIG A1 are two fourth symbols positioned behind RL-SIG, namely, the first symbol comprises: RL-SIG, XX-SIG A0 and XX-SIG A1.

One skilled in the art will appreciate that in 802.11 technology, one SIG typically includes 24 or 26 bits. Thus, continuing to show FIG. 10e, of the 24 bits of XX-SIG A0 and/or XX-SIG A1, the first 4 bits are taken as PPDU identifier bits for illustration, and the purpose of XX-SIG A0 and/or XX-SIG A1 as PPDU Marker symbols is achieved.

Based on the foregoing, in connection with fig. 3, 12 and 10e, the specific process of distinguishing between 802.11a, 802.11n, 802.11ac, 802.11ax and new standard protocol versions may include:

the first symbol after the IF L-SIG is BPSK modulation// condition 12

The first symbol after the IF L-SIG is not RL-SIG// condition 13

The PPDU is an 802.11a/802.11ac PPDU

Modulation scheme/condition 14 with QBPSK for the second symbol after IF L-SIG

The PPDU is an 802.11ac PPDU

ELSE

The PPDU is an 802.11a PPDU

The first four bits in the second symbol and/or the third symbol after ELSEIF L-SIG are the first sum

The first four bits in the second and/or third symbol represent an array of first values// condition 15

The PPDU is a new standard protocol version PPDU

ELSE

The PPDU is an 802.11ax PPDU

ELSE

The PPDU is an 802.11n PPDU

In addition to the above, the condition 12 may be replaced by a modulation scheme in which the first symbol after the L-SIG is QBPSK, the condition 13 may be replaced by a modulation scheme in which the first symbol after the L-SIG is RL-SIG, the condition 14 may be replaced by a modulation scheme in which the second symbol after the L-SIG is BPSK, the condition 15 may be replaced by a modulation scheme in which the first four bits of the second symbol and the third symbol after the L-SIG are not the first value, the array represented by the first four bits of the second symbol and the third symbol is not the first value, and any combination of the two modes of the condition 12, the two modes of the condition 13, the two modes of the condition 14 and the two modes of the condition 15 may be performed, which is not limited in this application.

In summary, the first symbol BPSK phase rotation after the L-SIG in the PPDU of the present application, the first symbol is set as a repeated L-SIG, at least one fourth symbol BPSK phase rotation after the first symbol in the PPDU, and the bit value of at least one fourth symbol after the first symbol in the PPDU is the first value and/or the value represented by the bit is the first value, which can be distinguished from the PPDU of 802.11a, 802.11ac, 802.11n, 802.11ax, thereby achieving the purpose of identifying the format of the PPDU of the standard version of the new generation protocol.

With continued reference to fig. 10e, the present application may use one or more bits of at least one fourth symbol (i.e., XX-SIG A0 and/or XX-SIG A1) located after the first symbol, except for bits used to represent a standard protocol version to which the PPDU conforms, to a common information field (COM-SIG) used to represent the PPDU, for providing related information of the PPDU.

Compared with the method for setting the PPDU Marker symbol by repeating the L-SIG in the prior art, in the present application, the first symbol located after the L-SIG is set as the repeated L-SIG, the first symbol is set as the modulation mode of BPSK, at least one fourth symbol located after the L-SIG is set as the modulation mode of BPSK, and the value of at least one bit of the at least one fourth symbol is the first value, or the value represented by at least one bit of the at least one fourth symbol is the first value, and the PPDU of a new standard protocol version can be effectively identified by the first symbol at least including the first symbol located after the L-SIG and the at least one fourth symbol located after the first symbol, meanwhile, the robustness of the 802.11 technology on the delay expansion is maintained, and the remaining bits in the fourth symbol can be freely subscribed to, so as to improve the efficiency of identifying the PPDU and support the richer characteristics.

Illustratively, the present application provides a transmission apparatus of a physical layer protocol data unit PPDU. Fig. 13 is a schematic structural diagram of a transmission device of a PPDU according to an embodiment of the present application, as shown in fig. 13, where a transmission device 100 of the PPDU generally refers to a sending device, and in an embodiment of a transmission method of the PPDU according to any one of the embodiments of the present application, the sending device is used to implement an operation of the sending device through software and/or hardware, and the sending device may include, but is not limited to, a wireless access point (wireless access point, AP), an AP may also be referred to as an access point, a bridge, a hot spot, or the like in a WLAN, an optical network device (optical network terminal, ONT), a router, or the like. And the transmitting device may also include, but is not limited to, a base station, an access network device, a Station (STA) in a WLAN, and the STA may also be called a user, a wireless sensor, a wireless communication terminal, or a mobile terminal (e.g., a mobile phone and a computer with wireless communication function), etc. In addition, the receiving device may also be a portable, pocket, hand-held, computer-built-in, wearable or vehicle-mounted wireless communication device.

As shown in fig. 13, a transmission apparatus 100 of a physical layer protocol data unit PPDU of the present application may include: an acquisition module 101 and a transmission module 102.

An obtaining module 101, configured to obtain a physical layer protocol data unit PPDU, where the PPDU includes a legacy information symbol L-SIG and a first symbol located after the L-SIG, where the first symbol is used to represent a standard protocol version to which the PPDU conforms;

a transmitting module 102, configured to transmit the PPDU to the receiving device, so that the receiving device determines, based on the first symbol, a standard protocol version to which the PPDU conforms.

In one possible design, the preset range is 77 or more and 127 or less.

The transmission device of the physical layer protocol data unit PPDU in the embodiment of the present application may be used to execute the technical scheme in the embodiment of the transmission method of the physical layer protocol data unit PPDU, and its implementation principle and technical effects are similar, and are not repeated here.

Illustratively, the present application provides a transmission apparatus of a physical layer protocol data unit PPDU. Fig. 14a is a schematic structural diagram of a transmission device of a PPDU according to an embodiment of the present application, as shown in fig. 14a, where a transmission device 200 of the PPDU generally refers to a receiving device, and in an embodiment of a transmission method of the PPDU according to any one of the embodiments of the present application, the receiving device is used to implement an operation of the receiving device through software and/or hardware, and the receiving device may include, but is not limited to, a base station, an access network device, a Station (STA) in a WLAN, and the STA may also be referred to as a device such as a user, a wireless sensor, a wireless communication terminal, or a mobile terminal (e.g., a mobile phone and a computer with a wireless communication function). In addition, the receiving device may also be a portable, pocket, hand-held, computer-built-in, wearable or vehicle-mounted wireless communication device. And the receiving device may also include, but is not limited to, a wireless access point (wireless access point, AP), which may also be referred to as an access point or bridge or hotspot in a WLAN, an optical network device (optical network terminal, ONT), router, etc. As shown in fig. 14a, the transmission apparatus 200 of the physical layer protocol data unit PPDU of the present application may include: a receiving module 201 and a determining module 202.

A receiving module 201, configured to receive a PPDU from a transmitting device, where the PPDU includes a legacy information symbol L-SIG and a first symbol located after the L-SIG, where the first symbol is used to represent a standard protocol version to which the PPDU conforms;

a determining module 202 is configured to determine, based on the first symbol, a standard protocol version to which the PPDU conforms.

In some embodiments, when the PPDU further includes a legacy short training symbol L-STF and a legacy long training symbol L-LTF, the determining module 202 is further configured to determine a start position of the PPDU and a position of the L-SIG in the PPDU by performing an operation on the L-STF and the L-LTF; and determining the position of the first symbol in the PPDU based on the starting position of the PPDU and the position of the L-SIG in the PPDU.

Fig. 14b is a schematic structural diagram of a transmission device of a physical layer protocol data unit PPDU according to an embodiment of the present application, as shown in fig. 14b, where the transmission device 200 of the physical layer protocol data unit PPDU may further include, based on the device structure shown in fig. 14 a: and a demodulation module 203.

The demodulation module 203 is configured to demodulate the PPDU based on a standard protocol version followed by the PPDU.

In one possible design, the preset range is 77 or more and 127 or less.

Illustratively, the present application provides a communication system. The communication system of the present application may include: the transmission apparatus of the physical layer protocol data unit PPDU shown in fig. 13 and the transmission apparatus of the physical layer protocol data unit PPDU shown in fig. 14a to 14 b.

The transmission device of the PPDU shown in fig. 13 is used to implement the operation of the transmitting device through software and/or hardware in any one of the embodiments of the transmission method of the PPDU shown in fig. 13, and the transmission device of the PPDU shown in fig. 14 a-14 b is used to implement the operation of the receiving device through software and/or hardware in any one of the embodiments of the transmission method of the PPDU shown in fig. 14 a-14 b.

The specific structure of the communication system provided in the present application may be described in the embodiments shown in fig. 3 to fig. 4, and the transmission process of the physical layer protocol data unit PPDU may be described in the embodiments shown in fig. 5 to fig. 11d, which are not repeated here.

For example, fig. 15 is a schematic hardware structure of a communication device provided in an embodiment of the present application, and as shown in fig. 15, the communication device 300 is configured to implement operations corresponding to a transmitting apparatus and/or a receiving apparatus through software and/or hardware in any of the foregoing method embodiments, where the communication device 300 of the present application may include: a memory 301 and a processor 302. The memory 301 and the processor 302 may be connected by a bus 303.

A memory 301 for storing program codes;

the processor 302 invokes program code, which when executed, is configured to perform the transmission method of the physical layer protocol data unit PPDU in any of the embodiments described above. Reference may be made in particular to the relevant description of the embodiments of the method described above.

Optionally, the present application further comprises a communication interface 304, which communication interface 304 may be connected to the processor 302 via a bus 303. Processor 302 may control communication interface 304 to implement the above-described functions of receiving and transmitting of communication device 300.

The communication device of the present application may be configured to execute the technical scheme in the embodiment of the transmission method of the physical layer protocol data unit PPDU, and its implementation principle and technical effects are similar, and are not repeated herein.

In the several embodiments provided in this application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described device embodiments are merely illustrative, e.g., the division of modules is merely a logical function division, and there may be additional divisions of actual implementation, e.g., multiple modules may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or modules, which may be in electrical, mechanical, or other forms.

The modules illustrated as separate components may or may not be physically separate, and components shown as modules may or may not be physical units, may be located in one place, or may be distributed over multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purposes of the embodiments of the present application.

In addition, each functional module in each embodiment of the present application may be integrated in one processing unit, or each module may exist alone physically, or two or more modules may be integrated in one unit. The units formed by the modules can be realized in a form of hardware or a form of hardware and software functional units.

The integrated modules, which are implemented in the form of software functional modules, may be stored in a computer readable storage medium. The software functional module is stored in a storage medium, and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor (english: processor) to perform some steps of the methods of the embodiments of the present application.

It is understood that the processor may be a central processing unit (central processing unit, CPU), but may also be other general purpose processors, digital signal processors (digital signal processor, DSP), application specific integrated circuits (application specific integrated circuit, ASIC), etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of a method disclosed in connection with the present invention may be embodied directly in a hardware processor for execution, or in a combination of hardware and software modules in a processor for execution.

The memory may comprise a high-speed RAM memory, and may further comprise a non-volatile memory NVM, such as at least one magnetic disk memory, and may also be a U-disk, a removable hard disk, a read-only memory, a magnetic disk or optical disk, etc.

The bus may be an industry standard architecture (industry standard architecture, ISA) bus, an external device interconnect (peripheral component, PCI) bus, or an extended industry standard architecture (extended industry standard architecture, EISA) bus, among others. The buses may be divided into address buses, data buses, control buses, etc. For ease of illustration, the buses in the drawings of the present application are not limited to only one bus or one type of bus.

The application also provides a readable storage medium, in which an execution instruction is stored, when at least one processor of the communication device executes the execution instruction, the communication device executes the transmission method of the physical layer protocol data unit PPDU in the method embodiment.

The application also provides a chip, the chip is connected with the memory, or the memory is integrated on the chip, and when a software program stored in the memory is executed, the transmission method of the physical layer protocol data unit (PPDU) in the embodiment of the method is realized.

The present application also provides a program product comprising execution instructions stored in a readable storage medium. The at least one processor of the communication device may read the execution instructions from the readable storage medium, the execution instructions being executed by the at least one processor to cause the communication device to implement the method for transmitting a physical layer protocol data unit PPDU in the method embodiment described above.

Those of ordinary skill in the art will appreciate that: in the above embodiments, it may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the processes or functions in accordance with embodiments of the present application are produced in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, or other programmable apparatus. The computer instructions may be stored in or transmitted from one computer-readable storage medium to another, for example, by wired (e.g., coaxial cable, fiber optic, digital Subscriber Line (DSL)), or wireless (e.g., infrared, wireless, microwave, etc.) means from one website, computer, server, or data center. Computer readable storage media can be any available media that can be accessed by a computer or data storage devices, such as servers, data centers, etc., that contain an integration of one or more available media. The usable medium may be a magnetic medium (e.g., floppy Disk, hard Disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., solid State Disk (SSD)), etc.

Claims

1. A transmission method of a physical layer protocol data unit PPDU, comprising:

the method comprises the steps that a transmitting device obtains a PPDU, wherein the PPDU comprises a traditional information symbol L-SIG and a first symbol positioned behind the L-SIG, the first symbol is used for representing a standard protocol version followed by the PPDU, the first symbol at least comprises a first symbol positioned behind the L-SIG, the first symbol adopts a quadrature binary phase shift keying QBSK modulation mode, and at least the first 7 bits of the first symbol represent values within a preset range, and the preset range is different from a range which is larger than or equal to 0 and smaller than or equal to 76;

2. The method of claim 1, wherein the step of determining the position of the substrate comprises,

the preset range is 77 or more and 127 or less.

3. The method of claim 1, wherein the step of determining the position of the substrate comprises,

the preset range includes a plurality of value intervals, the value intervals where the values represented by at least the first 7 bits of the first symbol are located are different, and the types of the PPDUs in the standard protocol version followed by the PPDUs represented by the first symbol are different.

4. The method of claim 1, wherein the step of determining the position of the substrate comprises,

the first symbol at least comprises a first symbol positioned behind the L-SIG, the first symbol adopts a QBSK modulation mode, and the value of at least the first 2 bits of the first symbol is a preset value 11.

5. The method of claim 4, wherein the step of determining the position of the first electrode is performed,

the value of the Mth bit of the first symbol is different, the type of the PPDU in the standard protocol version followed by the PPDU represented by the first symbol is different, and M is a positive integer greater than 2.

6. The method of claim 1, wherein the step of determining the position of the substrate comprises,

the PPDU also comprises a second symbol positioned behind the first symbol, and the second symbol adopts a Binary Phase Shift Keying (BPSK) modulation mode.

7. The method of claim 1, wherein the step of determining the position of the substrate comprises,

the first symbol at least comprises a first symbol positioned behind the L-SIG and at least one third symbol positioned behind the first symbol, the first symbol is a repeated traditional information symbol RL-SIG, and the first symbol adopts a modulation mode of quadrature binary phase shift keying BPSK; the at least one third symbol adopts a quadrature binary phase shift keying QBSK modulation mode.

8. The method of claim 7, wherein the step of determining the position of the probe is performed,

the value and/or the represented value of at least one bit of the third symbol are different, and the type of the PPDU in the standard protocol version followed by the PPDU represented by the first symbol is different.

9. The method of claim 1, wherein the step of determining the position of the substrate comprises,

the first symbol at least comprises a first symbol positioned behind the L-SIG and at least one fourth symbol positioned behind the first symbol, the first symbol is a repeated traditional information symbol RL-SIG, and the first symbol and each fourth symbol adopt a modulation mode of quadrature binary phase shift keying BPSK; the value of at least one bit of the at least one fourth symbol is the first value, and/or the value represented by at least one bit of the at least one fourth symbol is the first value.

10. The method of claim 9, wherein the step of determining the position of the substrate comprises,

the value and/or the represented value of at least one bit of the fourth symbol are different, and the type of the PPDU in the standard protocol version followed by the PPDU represented by the first symbol is different.

11. The method of claim 3, 5, 8 or 10, wherein,

The types of the PPDUs include: at least one of a Single user SU PPDU, a Multi-user MU PPDU, a Multi-access point Multi-AP PPDU, a Single access point Single-AP PPDU, a Multi-Link PPDU, a Single Link Single-Link PPDU, or an information field XX-SIG PPDU related to a standard protocol version.

12. The method of claim 1, wherein the step of determining the position of the substrate comprises,

at least one remaining bit of the first symbol, other than the bits used to represent the standard protocol version to which the PPDU conforms, is used to represent a common information field of the PPDU.

13. The method of claim 12, wherein the common information field comprises: at least one of a type field, a transmission opportunity TXOP field, a Tail field, a Color field of a basic service set BSS, an uplink UL/downlink DL field, other identifier fields of the PPDU, a cyclic redundancy check CRC field, or a bandwidth BW field of the PPDU.

14. A transmission method of a physical layer protocol data unit PPDU, comprising:

a receiving device receives a PPDU from a transmitting device, wherein the PPDU comprises a legacy information symbol L-SIG and a first symbol located after the L-SIG, the first symbol is used for representing a standard protocol version followed by the PPDU, the first symbol at least comprises a first symbol located after the L-SIG, the first symbol adopts a modulation mode of quadrature binary phase shift keying QBPSK, and a value represented by at least the first 7 bits of the first symbol is in a preset range, and the preset range is different from a range which is greater than or equal to 0 and less than or equal to 76;

15. The method of claim 14, wherein when the PPDU further includes a legacy short training symbol L-STF and a legacy long training symbol L-LTF, the method further comprises:

16. The method according to claim 14 or 15, characterized in that the method further comprises:

17. The method of claim 14, wherein the step of providing the first information comprises,

the preset range is 77 or more and 127 or less.

18. The method of claim 14, wherein the step of providing the first information comprises,

19. The method of claim 14, wherein the step of providing the first information comprises,

20. The method of claim 19, wherein the step of determining the position of the probe comprises,

21. The method of claim 14, wherein the step of providing the first information comprises,

22. The method of claim 14, wherein the step of providing the first information comprises,

23. The method of claim 22, wherein the step of determining the position of the probe is performed,

24. The method of claim 14, wherein the step of providing the first information comprises,

25. The method of claim 24, wherein the step of determining the position of the probe is performed,

26. The method of claim 18, 20, 23 or 25, wherein,

27. The method of claim 14, wherein the step of providing the first information comprises,

28. The method of claim 27, wherein the common information field comprises: at least one of a type field, a transmission opportunity TXOP field, a Tail field, a Color field of a basic service set BSS, an uplink UL/downlink DL field, other identifier fields of the PPDU, a cyclic redundancy check CRC field, or a bandwidth BW field of the PPDU.

29. A transmission apparatus for a physical layer protocol data unit PPDU, applied to a transmission apparatus, the apparatus comprising:

an obtaining module, configured to obtain a PPDU, where the PPDU includes a legacy information symbol L-SIG and a first symbol located after the L-SIG, where the first symbol is used to represent a standard protocol version followed by the PPDU, the first symbol includes at least a first symbol located after the L-SIG, the first symbol adopts a modulation mode of quadrature binary phase shift keying QBPSK, and a value represented by at least the first 7 bits of the first symbol is in a preset range, where the preset range is different from a range greater than or equal to 0 and less than or equal to 76;

30. The apparatus of claim 29, wherein the device comprises a plurality of sensors,

the preset range is 77 or more and 127 or less.

31. The apparatus of claim 29, wherein the device comprises a plurality of sensors,

32. The apparatus of claim 29, wherein the device comprises a plurality of sensors,

33. The apparatus of claim 32, wherein the device comprises a plurality of sensors,

34. The apparatus of claim 29, wherein the device comprises a plurality of sensors,

35. The apparatus of claim 29, wherein the device comprises a plurality of sensors,

36. The apparatus of claim 35, wherein the device comprises a plurality of sensors,

37. The apparatus of claim 29, wherein the device comprises a plurality of sensors,

38. The apparatus of claim 37, wherein the device comprises a plurality of sensors,

39. The apparatus of claim 31, 33, 36 or 38, wherein the apparatus comprises,

40. The apparatus of claim 29, wherein the device comprises a plurality of sensors,

41. The apparatus of claim 40, wherein the common information field comprises: at least one of a type field, a transmission opportunity TXOP field, a Tail field, a Color field of a basic service set BSS, an uplink UL/downlink DL field, other identifier fields of the PPDU, a cyclic redundancy check CRC field, or a bandwidth BW field of the PPDU.

42. A transmission apparatus of a physical layer protocol data unit PPDU, applied to a reception apparatus, the apparatus comprising:

a receiving module, configured to receive a PPDU from a transmitting device, where the PPDU includes a legacy information symbol L-SIG and a first symbol located after the L-SIG, where the first symbol is used to represent a standard protocol version followed by the PPDU, the first symbol includes at least a first symbol located after the L-SIG, the first symbol adopts a modulation mode of quadrature binary phase shift keying QBPSK, and a value represented by at least the first 7 bits of the first symbol is in a preset range, where the preset range is different from a range greater than or equal to 0 and less than or equal to 76;

43. The apparatus of claim 42, wherein when the PPDU further includes a legacy short training symbol L-STF and a legacy long training symbol L-LTF, the determining module is further configured to determine a starting location of the PPDU and a location of the L-SIG in the PPDU by operating on the L-STF and the L-LTF; and determining the position of the first symbol in the PPDU based on the starting position of the PPDU and the position of the L-SIG in the PPDU.

44. The apparatus according to claim 42 or 43, further comprising:

45. The apparatus of claim 42, wherein the device comprises,

the preset range is 77 or more and 127 or less.

46. The apparatus of claim 42, wherein the device comprises,

47. The apparatus of claim 42, wherein the device comprises,

48. The apparatus of claim 47, wherein the device comprises,

49. The apparatus of claim 42, wherein the device comprises,

50. The apparatus of claim 42, wherein the device comprises,

51. The apparatus of claim 50, wherein the device comprises,

52. The apparatus of claim 42, wherein the device comprises,

53. The apparatus of claim 52, wherein the device comprises,

54. The device of claim 46, 48, 51 or 53, wherein,

55. The apparatus of claim 42, wherein the device comprises,

56. The apparatus of claim 55, wherein the common information field comprises: at least one of a type field, a transmission opportunity TXOP field, a Tail field, a Color field of a basic service set BSS, an uplink UL/downlink DL field, other identifier fields of the PPDU, a cyclic redundancy check CRC field, or a bandwidth BW field of the PPDU.

57. A communication system, comprising: transmission apparatus of a physical layer protocol data unit PPDU according to any one of claims 29 to 41 and transmission apparatus of a physical layer protocol data unit PPDU according to any one of claims 42 to 56.

58. A computer readable storage medium having stored thereon a computer program, wherein the computer program when executed by a processor implements the method for transmission of a physical layer protocol data unit PPDU according to any one of claims 1-13 or the method for transmission of a physical layer protocol data unit PPDU according to any one of claims 14-28.

59. A communication device, comprising:

a processor; and

a memory for storing executable instructions of the processor;

a transmitter for transmitting a PPDU;

wherein the processor is configured to perform the transmission method of the physical layer protocol data unit PPDU of any one of claims 1-13 via execution of the executable instructions.

60. A communication device, comprising:

a processor; and

a memory for storing executable instructions of the processor;

A receiver for receiving a PPDU;

wherein the processor is configured to perform the method of transmission of the physical layer protocol data unit PPDU of any one of claims 14-28 via execution of the executable instructions.