CN113162957A

CN113162957A - Method, device and system for transmitting physical layer protocol data unit (PPDU)

Info

Publication number: CN113162957A
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: 2021-07-23
Anticipated expiration: 2040-01-22
Also published as: CN113162957B

Abstract

The application provides a method, a device and a system for transmitting a physical layer protocol data unit (PPDU), wherein the method comprises the following steps: the method comprises the steps that a sending device obtains a PPDU (protocol data Unit), wherein the PPDU comprises a traditional 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 transmitting apparatus transmits the PPDU to the receiving apparatus so that the receiving apparatus 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 followed by the PPDU can be determined, the new and old standard protocol versions can be distinguished, and the demodulation of the PPDU is convenient to realize.

Description

Method, device and system for transmitting physical layer protocol data unit (PPDU)

Technical Field

The present application 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 gradual introduction of new technologies and new features by the IEEE 802.11 standards organization, such as: the new generation of 802.11be introduces new features such as Multi-link, Multi-access point, low latency, large bandwidth, etc. different from the previous protocol standard version, and forms a next generation of protocol standard version, such as: 802.11a, 802.11n, 802.11ac, 802.11ax, 802.11be, and subsequent protocol standards versions, and the like. The formation of a new Protocol standard version requires redefining Physical layer Protocol Data units (PPDUs) of different formats in a Wireless Local Area Network (WLAN), so that a WLAN device can distinguish different Protocol standard versions based on the format of the PPDU.

Generally, the WLAN transmitter transmits the PPDU through an antenna after a series of operations such as encoding, modulation, frequency conversion, amplification, etc. are performed on the PPDU. The WLAN receiver performs frame identification on the PPDU according to the signal received by the antenna. Such as: judging the initial position of the PPDU by a traditional Short Training Field (L-STF) and a traditional Long Training symbol (L-LTF); the length of the PPDU is determined by Legacy information symbols (Legacy SIGNAL, L-SIG).

However, for PPDUs (i.e. physical frames) of different protocol standard versions, the WLAN receiver needs more information of the PPDU, such as bandwidth, modulation and coding scheme, space division multiplexing scheme, frequency division multiplexing scheme, etc., to demodulate other parts of the PPDU. Other parts of the PPDU are different from one another in terms of versions of different protocol standards, and therefore, different signals are required to carry corresponding information. Such as: high Throughput information symbols (HT-SIGNAL) 1 and HT-SIG2 in 802.11 n; very High Throughput information symbols (VHT-SIG) in 802.11 ac; high efficiency information symbols (HE-SIG) in 802.11 ax.

Since the above symbols may be used to guide the demodulation of the entire PPDU, to facilitate timely parsing of the PPDU, the above symbols may be located at the front of the PPDU, such as typically after the L-SIG, or at other locations (e.g., the HE-SIG in 802.11ax is located after a repeated legacy information symbol (RL-SIG)). Based on the foregoing description, fig. 1 shows the format of a general PPDU supporting various protocol standard versions. As shown in fig. 1, a format of a 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 sign) and DATA (DATA) symbol, etc., in order from a Least Significant Bit (LSB) to a Most Significant Bit (MSB).

All protocol standard versions support three symbols of L-STF, L-LTF and L-SIG, and the three symbols are universal symbols and have fixed formats and can be analyzed without identification. PPDU Marker symbols (symbols) are used to distinguish different protocol standard versions, with different definitions and formats. Such as: when the WLAN receiver demodulates to RL-SIG, it can be identified that the PPDU is an 802.11ax PPDU. Thus, RL-SIG is referred to as the PPDU Marker symbol. The following steps are repeated: when the WLAN receiver demodulates HT-SIG of Quadrature Binary Phase Shift Keying (QBPSK) modulation mode after L-SIG, the PPDU can be identified to be an 802.11n PPDU. Thus, HT-SIG is referred to as a PPDU Marker symbol. In addition, the dashed line is shown in fig. 1 because the PPDU Marker symbol always immediately follows the L-SIG and may be represented by a symbol with a different meaning in different protocol standard versions to serve as an identification of the format of the PPDU. The XX-training symbols may serve as training, i.e., dedicated LTF (XX-LTF). Such as: high efficiency Short Training Field (HE-STF) and High efficiency Long Training Field (HE-LTF) in 802.11 ax; VHT-STF and VHT-LTF in 802.11ac, etc. In different versions of the protocol standard, more SIGNAL may be present after the XX-tracing symbol, so it is illustrated in FIG. 1 by a dashed line.

In the evolution process of 802.11 technology, in consideration of PPDU compatibility, a new generation of protocol standard version needs to be compatible with each previous protocol standard version, that is, a WLAN device supporting a PPDU of the new generation of protocol standard version needs to be able to identify formats of PPDUs of all new and old protocol standard versions so as to perform demodulation according to the corresponding formats.

For example: the 802.11ax PDDU needs to be compatible with the previous 802.11a, 802.11n and 802.11ac PDDUs. FIG. 2 shows a portion of the contents of the formats of the respective PPDUs for 802.11a, 802.11n, 802.11ac, and 802.11 ax. As shown in fig. 2, in 802.11a, the partial contents of the PPDU format sequentially include: the system comprises an L-STF, an L-LTF and an L-SIG, wherein the L-SIG adopts a Binary Phase Shift Keying (BPSK) modulation mode. In 802.11n, the partial contents of PPDU format sequentially include: the system comprises L-STF, L-LTF, L-SIG, HT-SIG1, HT-SIG2, a High Throughput Short Training symbol (HT-STF) and a High Throughput Long Training symbol (HT-LTF), wherein the L-SIG adopts a BPSK modulation mode, and the HT-SIG1 and the HT-SIG2 adopt a QBPSK modulation mode. In 802.11ac, part of the contents of the PPDU format sequentially include: the system comprises an L-STF, an L-LTF, an L-SIG, a VHT-SIGA1, a VHT-SIGA2, a Very High Throughput Short Training symbol (VHT-STF), and a Very High Throughput Long Training symbol (VHT-LTF), wherein the L-SIG and the VHT-SIGA1 adopt a BPSK modulation mode, and the VHT-SIGA2 adopts a QBPSK modulation mode. In 802.11ax, part of the contents of PPDU format 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 BPSK modulation mode. For convenience of explanation, in fig. 2, the QBPSK modulation scheme is illustrated by diagonal lines, and the BPSK modulation scheme is illustrated by vertical lines.

With reference to fig. 2, a specific process for distinguishing 802.11a, 802.11n, 802.11ac, and 802.11ax may include:

modulation scheme// condition 1 for QBPSK as the first symbol after IF L-SIG

The PPDU is a PPDU of 802.11n

Modulation scheme// condition 2 for the second symbol after ELSEIF L-SIG to be QBPSK

The PPDU is a PPDU of 802.11ac

The first symbol behind the ELSEIF L-SIG is completely the same as the L-SIG// condition 3, wherein the execution order of the condition 2 and the condition 3 is not sequential, namely the condition 2 is judged first, and then the condition 3 is judged; or judging the condition 3 first and then judging the condition 2; condition 2 and condition 3 may also be determined simultaneously.

The PPDU is a PPDU with 802.11ax

ELSE

The PPDU is a PPDU of 802.1a

Therefore, how to set the format of the PPDU of the new generation protocol standard version, such as 802.11be, so that the WLAN device can distinguish each protocol standard version is a problem which needs to be solved urgently.

Disclosure of Invention

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

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

a sending device obtains a PPDU, 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 transmitting apparatus transmits the PPDU to a receiving apparatus to cause the receiving apparatus to determine a standard protocol version to which the PPDU conforms based on the first symbol.

With the transmission method of a physical layer protocol data unit PPDU provided by the first aspect, a first symbol is set after an L-SIG in the PPDU, where the first symbol may be one or more symbols, and the first symbol is used to indicate a standard protocol version that the PPDU conforms to, so that a transmitting apparatus can set a PPDU that can include the first symbol that determines the standard protocol version that the PPDU conforms to, and further, a receiving apparatus determines the standard protocol version that the PPDU conforms to by identifying the first symbol in the PPDU transmitted by the transmitting apparatus. Therefore, based on the characteristics of the PPDU of the old standard protocol version, by means of one or more symbols (namely, the first symbol) which are positioned behind the L-SIG in the PPDU and represent the new standard protocol version followed by the PPDU, not only can the format of the PPDU in the new standard protocol version be set, and the PPDU can be conveniently transmitted, but also the new standard protocol version followed by the PPDU can be determined, so that the new and old standard protocol versions can be distinguished, and the PPDU can be conveniently demodulated.

In one possible design, the first symbol at least includes a first symbol after the L-SIG, the first symbol employs a modulation scheme of Quadrature Binary Phase Shift Keying (QBPSK), and a value represented by at least first 7 bits of the first symbol is within 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 predetermined range is equal to or greater than 77 and equal to or less than 127.

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

In a possible design, the PPDU further includes a second symbol after the first symbol, where the second symbol uses a binary phase shift keying BPSK modulation scheme.

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 to be the QBPSK modulation mode, and the value represented by at least the first 7 bits of the first symbol is within a preset range different from a range which is greater than or equal to 0 and less than or equal to 76, the first symbol at least contains the first symbol located after the L-SIG, so that the PPDU of a new standard protocol version can be effectively identified, and meanwhile, the distinction of the PPDUs of the new and old standard protocol versions is supported, and the L-SIG is not simply repeated, the remaining 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 following the first symbol in the PPDU may further determine a standard protocol version that the PPDU determined by the first symbol complies with by using a BPSK modulation method. And the bits in the second symbol can also be freely defined.

In one possible design, the first symbol at least includes a first symbol located after the L-SIG, the first symbol employs a QBPSK modulation scheme, and a value of at least 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, the PPDU represented by the first symbol has a different type in a standard protocol version to which the PPDU conforms, and 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 behind the L-SIG is set to be the QBPSK modulation mode, at least the first 2 bits of the first symbol are set to be the preset value 11, the first symbol at least contains the PPDU behind the L-SIG, which can effectively identify the new standard protocol version, and simultaneously supports the distinction of the PPDU of the new and old standard protocol versions, and is not the simple repeated 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 following the first symbol in the PPDU may further determine a standard protocol version that the PPDU determined by the first symbol complies with by using a BPSK modulation method. 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 following the L-SIG and at least a third symbol following the first symbol, where the first symbol is a repeated legacy information symbol RL-SIG and the first symbol employs a modulation scheme of quadrature binary phase shift keying, BPSK; and the at least one third symbol adopts a modulation mode of quadrature binary phase shift keying QBPSK.

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

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 after the L-SIG is set to be the repeated L-SIG, the first symbol is set to be the BPSK modulation mode, and the at least one third symbol after the first symbol is set to be the QBPSK modulation mode, and the first symbol at least includes the first symbol after the L-SIG and the at least one third symbol after the first symbol, so that the PPDU of a new standard protocol version can be effectively identified, and meanwhile, the distinction of the PPDUs of new and old standard protocol versions is supported, the robustness of the 802.11 technology to delay spread is also maintained, and the remaining bits in the third symbol can be freely subscribed, so that the efficiency of identifying the PPDU is improved, and richer protocol characteristics are supported.

In one possible design, the first symbol includes at least a first symbol after the L-SIG and at least a fourth symbol after the first symbol, the first symbol is a repeated legacy information symbol RL-SIG, and the first symbol and each fourth symbol employ a modulation scheme 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, a value of at least one bit of the fourth symbol and/or a value represented by the fourth symbol are different, and a type of the PPDU in a 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 present application, a first symbol located after the L-SIG is set as the repeated L-SIG, the first symbol is set as a BPSK modulation scheme, at least one fourth symbol located after the L-SIG is set as a BPSK modulation scheme, and a value of at least one bit of the at least one fourth symbol is a first value, and/or a value represented by at least one bit of the at least one fourth symbol is a first value, and by the first symbol including at least the first symbol located after the L-SIG and the at least one fourth symbol located after the first symbol, a new PPDU of a standard protocol version can be effectively identified, and at the same time, the differentiation of PPDUs of new and old standard protocol versions is supported, and the robustness of 802.11 technology to delay spread is also maintained, and the rest bits in the fourth symbol can be freely subscribed, so that the efficiency of identifying the PPDU is improved, and richer protocol characteristics are supported.

In one possible design, the type of PPDU 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 Multi-Link PPDU, a Single-Link Single-Link PPDU, or a standard protocol version related information field XX-SIG PPDU.

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

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

the method comprises the steps that 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.

With the transmission method of a physical layer protocol data unit PPDU provided by the second aspect, a first symbol is disposed after an L-SIG in the PPDU, where the first symbol may be one or more symbols and is used to indicate a standard protocol version that the PPDU conforms to, so that a receiving apparatus may receive the PPDU sent by a sending apparatus and including an identifier that enables determination of the standard protocol version that the PPDU conforms to, and further cause the receiving apparatus to determine the standard protocol version that the PPDU conforms to by identifying the first symbol in the PPDU. Therefore, based on the characteristics of the PPDU of the old standard protocol version, by means of one or more symbols (namely, the first symbol) which are positioned behind the L-SIG in the PPDU and represent the new standard protocol version followed by the PPDU, not only can the format of the PPDU in the new standard protocol version be set, and the PPDU can be conveniently transmitted, but also the new standard protocol version followed by the PPDU can be determined, so that the new and old standard protocol versions can be distinguished, and the PPDU can be conveniently demodulated.

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

the receiving device determines 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;

the receiving apparatus 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 includes:

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

In one possible design, the common information field includes: at least one of a type field of the PPDU, a transmission opportunity TXOP field, a Tail Tail field, a Color field of a basic service set BSS, an uplink UL/downlink DL field, other identification identifier field of the PPDU, a Cyclic Redundancy Check (CRC) field, or a bandwidth BW field.

In a third aspect, the present application provides a device for transmitting 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, and the first symbol is used to indicate a standard protocol version compliant with the PPDU;

a sending module, configured to send the PPDU to a receiving apparatus, so that the receiving apparatus determines a standard protocol version compliant with the PPDU based on the first symbol.

The beneficial effects of the transmission apparatus for a physical layer protocol data unit PPDU provided in the third aspect and each possible design of the third aspect may refer to the beneficial effects brought by each possible implementation manner of the first aspect, and are not described herein again.

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

a receiving module, configured to receive a PPDU from a transmitting apparatus, where the PPDU includes a legacy information symbol L-SIG and a first symbol located after the L-SIG, and the first symbol is used to indicate a standard protocol version compliant with the PPDU;

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

In one possible design, when a legacy short training symbol L-STF and a legacy long training symbol L-LTF are further included in the PPDU, 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 operating on the L-STF and the L-LTF; determining 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 apparatus further includes:

a demodulation module for demodulating the PPDU based on a standard protocol version followed by the PPDU.

The beneficial effects of the transmission apparatus for a physical layer protocol data unit PPDU provided in the fourth aspect and in each possible design of the fourth aspect may refer to the beneficial effects brought by each possible implementation manner of the second aspect, and are not described again here.

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

The beneficial effects of the communication system provided in the fifth aspect and in each possible design of the fifth aspect may refer to the beneficial effects brought by each possible implementation manner of the third aspect and each possible implementation manner of the fourth aspect and the fourth aspect, and are not described again here.

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 PPDU;

the processor is configured to invoke program instructions in the memory to perform the method for transmitting a physical layer protocol data unit, PPDU, in the first aspect and any one of the possible designs of the first aspect.

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

the memory is used for storing program instructions;

the receiver is used for receiving PPDU;

the processor is used for calling the program instructions in the memory to execute the transmission method of the physical layer protocol data unit PPDU in the second aspect and any one possible design of the second aspect.

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

In a ninth aspect, the present application provides a readable storage medium, where an execution instruction is stored in the readable storage medium, and when the execution instruction is executed by at least one processor of a communication device, the communication device executes the transmission method for a physical layer protocol data unit PPDU in any one of the possible designs of the second aspect and 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, and the execution of the execution instructions by the at least one processor causes the communication device to implement the method for transmitting a physical layer protocol data unit, PPDU, in any one of the possible designs of the first aspect and 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, and the execution of the execution instructions by the at least one processor causes the communication device to implement the method for transmission of a physical layer protocol data unit, PPDU, in any one of the possible designs of the second aspect and 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 method for transmitting a physical layer protocol data unit PPDU in any one of the possible designs of the first aspect and 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 method for transmitting a physical layer protocol data unit PPDU in any one of the possible designs of the second aspect and the second aspect is implemented.

Drawings

FIG. 1 is a diagram of a generic PPDU format supporting various protocol standard versions;

FIG. 2 is a schematic diagram of a portion of the contents of the formats of the PPDUs of 802.11a, 802.11n, 802.11ac, and 802.11ax, respectively;

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

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

fig. 5 is an interaction diagram of a transmission method of a physical layer protocol data unit PPDU according to an embodiment of the present application;

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

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

FIG. 7a is a diagram illustrating details of a first symbol following the L-SIG in FIG. 6 b;

FIG. 7b is a diagram illustrating details of a first symbol following the L-SIG in FIG. 6 b;

FIG. 7c is a diagram illustrating details of a first symbol following the L-SIG in FIG. 6 b;

FIG. 7d is a diagram illustrating details of a first symbol following the L-SIG in FIG. 6 b;

FIG. 7e is a diagram illustrating details of a first symbol following the L-SIG in FIG. 6 b;

FIG. 7f is a diagram illustrating details of a first symbol following the L-SIG in FIG. 6 b;

FIG. 7g is a diagram illustrating details of a first symbol following the L-SIG in FIG. 6 b;

fig. 8a is a diagram illustrating a part of the contents of a format of a PPDU of a new protocol standard version according to an embodiment of the present application;

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

FIG. 9a is a diagram illustrating details of a first symbol following the L-SIG in FIG. 8 b;

FIG. 9b is a diagram illustrating details of a first symbol following the L-SIG in FIG. 8 b;

FIG. 9c is a diagram illustrating details of a first symbol following the L-SIG in FIG. 8 b;

FIG. 9d is a diagram illustrating details of a first symbol following the L-SIG in FIG. 8 b;

FIG. 9e is a diagram illustrating details of a first symbol following the L-SIG in FIG. 8 b;

FIG. 9f is a diagram illustrating details of a first symbol following the L-SIG in FIG. 8 b;

FIG. 9g is a diagram illustrating details of a first symbol following the L-SIG in FIG. 8 b;

fig. 10a is a diagram illustrating a part of the contents of a PPDU format of a new protocol standard version according to an embodiment of the present application;

FIG. 10b is a diagram illustrating a portion of the contents of a PPDU format of a new protocol standard version provided in an embodiment of the present application;

FIG. 10c is a diagram illustrating a portion of the contents of a PPDU format of a new protocol standard version provided in an embodiment of the present application;

FIG. 10d is a diagram illustrating a portion of the contents of a PPDU format of a new protocol standard version provided in 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 diagram illustrating details of a third symbol in FIG. 10 e;

FIG. 11b is a diagram illustrating details of a third symbol in FIG. 10 e;

FIG. 11c is a diagram illustrating details of a third symbol in FIG. 10 e;

FIG. 11d is a diagram illustrating details of a third symbol in FIG. 10 e;

FIG. 11e is a diagram illustrating details of a third symbol in FIG. 10 e;

fig. 12 is a diagram illustrating a part of the contents of a 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 apparatus for a physical layer protocol data unit PPDU according to an embodiment of the present application;

fig. 14a is a schematic structural diagram of a transmission apparatus for a physical layer protocol data unit PPDU according to an embodiment of the present application;

fig. 14b is a schematic structural diagram of a transmission apparatus for a physical layer protocol data unit PPDU according to an embodiment of the present application;

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

Detailed Description

Fig. 3 shows an architectural diagram 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 referred to herein may include, but are not limited to: narrowband Band-Internet of Things (NB-IoT), Global System for Mobile Communications (GSM), Enhanced Data rates for GSM Evolution (EDGE), Wideband Code Division Multiple Access (WCDMA), Code Division Multiple Access (Code Division Multiple Access, CDMA2000), Time Division-synchronous 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 sending apparatus or the receiving apparatus mentioned in this application may include, but is not limited to, a wireless Access Point (AP), where the AP may also be referred to as an access point or a bridge or a hot spot in a WLAN, an optical network device (ONT), a router, and other apparatuses.

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, where 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), and the like. In addition, the receiving device may also be a portable, pocket, hand-held, computer-embedded, wearable, or vehicle-mounted wireless communication device.

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

a transmitter: the PPDU is used for generating PPDU conforming to the standard protocol version and is transmitted to the opposite WLAN equipment through an antenna through a series of digital and analog signal processing procedures.

A receiver: the system is used for receiving PPDU transmitted by the opposite terminal WLAN equipment and converting radio frequency analog signals into baseband digital signals.

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 specifications.

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

A memory: provides the necessary storage for the transmission and reception of PPDUs and may include, but is not limited to, Random Access Memory (RAM), Read Only Memory (ROM), and the like.

Accelerator: acceleration capabilities are provided for the processing and computation of the transmission and reception of the PPDU, which may include, but are not limited to, hardware accelerators, software accelerators, AI accelerators, and the like.

An antenna: and the radio frequency analog signal transmitter is connected with the transmitter and the receiver and used for transmitting and receiving radio frequency analog signals.

Wherein the transmitter and receiver may be combined into one module, called Transceiver.

In order to solve the problem of distinguishing between old and new standard protocol versions through the format of a PPDU, the present application provides a method, an apparatus, a system, a device, and a computer storage medium for transmitting a physical layer protocol data unit PPDU, where a first symbol may be one or more symbols after an L-SIG located in the PPDU, and the first symbol is used to indicate a standard protocol version that the PPDU conforms to, so that a transmitting apparatus can set a PPDU capable of determining the standard protocol version that the PPDU conforms to, and a receiving apparatus determines the standard protocol version that the PPDU conforms to by identifying the first symbol in the PPDU. Therefore, based on the characteristics of the old PPDU of the standard protocol version, by means of one or more symbols (namely, the first symbol) which are positioned behind the L-SIG in the PPDU and represent the new standard protocol version followed by the PPDU, not only can the format of the PPDU in the new standard protocol version be set, and the transmission of the PPDU is facilitated, but also the new standard protocol version followed by the PPDU can be determined, so that the new and old standard protocol versions can be distinguished, and the demodulation of the PPDU is facilitated.

Wherein, the symbol is the basic constituent unit of the PPDU. Generally, 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 XX-SIG can be 24 or 26.

One or more symbols may form a domain, and each domain generally uses the same encoding method, and the number of symbols in a domain is not limited in the present application. For example, in 802.11 technology, the L-STF includes two symbols and the L-SIG includes one symbol. Wherein, the L-STF can be called as a conventional short training symbol and can also be called as a conventional short training field. In addition, each domain typically represents a different function, such as: the L-STF and L-SIG function differently. The information represented by the bits in each field may be the same or different. In addition, any one of the domains may further include one or more basic domains, such as an information basic domain, and the like. And one field (or information field) may be used to represent one or more bits of the information basic field. That is to say, an information field may be an information symbol or a part of an information symbol, and the present application may be set according to actual situations, which is not limited herein.

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

Next, a specific implementation procedure of the transmission method of the physical layer protocol data unit PPDU provided by the present application will be described with the transmitting apparatus and the receiving apparatus shown in fig. 3 to 4 as execution subjects.

Fig. 5 is an interaction diagram of a transmission method of a physical layer protocol data unit PPDU according to an embodiment of the present application, and as shown in fig. 5, the transmission method of the physical layer protocol data unit 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 after the L-SIG, and the first symbol is used for representing a standard protocol version followed by the PPDU.

In this application, the sending apparatus may generate the PPDU by the sending apparatus based on the difference between the PPDUs of the new and old standard protocol versions, and may also obtain the PPDU from other apparatuses, which is not limited in this application.

In the protocol standard versions of the four main generations, 802.11a, 802.11n, 802.11ac and 802.11ax, the format of the 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 behind the L-SIG, which is beneficial for a receiving device to be able to identify the format of the PPDU as soon as possible to determine the standard protocol version complied with by the PPDU, so as to facilitate proper processing of subsequently received signals according to the standard protocol version complied with by the PPDU. The PPDU Marker symbol may comprise one or more symbols, among others.

2. The LENGTH of the PPDU is indicated to be reserved through a RATE field and a LENGTH field in the L-SIG, so as to ensure that all WLAN devices of the standard protocol version can set NAV according to values set in the RATE field and the LENGTH field (the NAV can implement a mechanism for virtual carrier monitoring in the WLAN standard, and the specific procedure is that the WLAN devices may receive PPDUs sent by other users in the process of monitoring a Channel, the PPDU includes a time LENGTH t of a Channel which is expected to be used by the WLAN device sending the PPDU, and a WLAN device which overhears the information may set a time LENGTH t, and the WLAN device may not send any signal in the time t no matter the Channel state, so as to avoid interference to other devices), and the compatibility of Clear Channel Assessment (CCA) is maintained.

3. The PPDU Marker symbol usually adopts a phase rotation (such as BPSK or QBPSK) or a field repetition manner, wherein the field repetition manner needs to add an additional symbol to carry 1bit information, and the QBPSK phase rotation manner does not need additional overhead.

Based on the above, the new PPPDU of the standard protocol version may include: the PPDU comprises an L-SIG and a first symbol, wherein the first symbol is located after the L-SIG and is used for indicating a new standard protocol version followed by the PPDU, and the first symbol is a PPDU Marker symbol, and the new standard protocol version refers to a standard protocol version different from an old standard protocol version (i.e., an existing standard protocol version). The number and the specific content of the first symbols are not limited in the present application. In addition, the PPDU may include other symbols in addition to the L-SIG and the first symbol.

Wherein, the old standard protocol version is an existing standard protocol version, or a standard protocol version already provided with a PPDU Marker symbol, such as: 802.11a, 802.11n, 802.11ac, and 802.11 ax. The new standard protocol version is a standard protocol version without a PPDU Marker symbol, for example: 802.11be and subsequent protocol standards versions, etc., which are not limited in this application. In addition, the new standard protocol version can also be an old standard protocol version, and the setting of the PPDU Marker symbol is different from the setting of the existing PPDU Marker symbol. That is, the PDDU of the old standard protocol version may also adopt the format of the PDDU in the present application.

S102, the sending device sends the PPDU to the receiving device.

In this application, a sending apparatus may send a PPDU to a receiving apparatus, where the PPDU carries a first symbol in S101, where the first symbol is used to indicate a standard protocol version that the PPDU conforms to.

The specific representation form of the PPDU is not limited in the present application, and only the standard protocol version that the PPDU supports the PPDU is required to be satisfied.

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

Based on S102, the receiving apparatus may receive a PPDU from the transmitting apparatus. Since the PPDU carries the first symbol, the first symbol may include at least one symbol after the L-SIG, and the first symbol may be used to indicate a standard protocol version compliant with the PPDU. Therefore, the receiving device can use the first symbol as a PPDU Marker symbol to determine a new standard protocol version followed by the PPDU so as to distinguish the new and old standard protocol versions.

The implementation manner of determining the first symbol by the receiving apparatus is not limited in the present application. Optionally, when the PPDU further includes: during L-STF and L-LTF, 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 thereby the standard protocol version followed by the PPDU can be quickly and timely determined.

S104, the receiving device demodulates the PPDU based on the standard protocol version complied with by the PPDU.

S104 is optional. In this application, when determining the standard protocol version complied with by the PPDU, the receiving apparatus may obtain information of the PPDU corresponding to the standard protocol version complied with by the PPDU, such as: bandwidth, modulation coding scheme, space division multiplexing scheme, frequency division multiplexing scheme, or the like, to demodulate the PPDU.

According to the transmission method of the physical layer protocol data unit PPDU provided by the application, a first symbol is set after an L-SIG located in the PPDU, wherein the first symbol may include one or more symbols, and the first symbol is used for indicating a standard protocol version followed by the PPDU, so that a sending device can set the PPDU which can determine 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. Therefore, based on the characteristics of the old PPDU of the standard protocol version, by means of at least one symbol which is positioned behind the L-SIG in the PPDU and represents the new standard protocol version followed by the PPDU, the format of the PPDU in the new standard protocol version can be set, the transmission of the PPDU is convenient to realize, the new standard protocol version followed by the PPDU can be determined, the new and old standard protocol versions can be distinguished, and the demodulation of the PPDU is convenient to realize.

The following describes in detail the technical solution of the embodiment of the method shown in fig. 5, using several specific embodiments.

In this application, the number of first symbols used to indicate the standard protocol version that the PPDU conforms to may be one, or may be multiple, and this is not limited in this application. Based on the above, the following respectively exemplifies specific implementation manners of the first symbol in the PPDU format with reference to the first embodiment, the second embodiment, the third embodiment and the fourth embodiment.

Example one

In one embodiment, the first symbol may be represented by one or more symbols of a standard protocol version that the PPDU conforms to, and the first symbol may include multiple representations. Optionally, based on the existing PPDU format of each of 802.11a, 802.11n, 802.11ac, and 802.11ax, the first symbol may at least include: the first symbol after the L-SIG. That is, the first symbol may include only the first symbol after the L-SIG, and may also include the first symbol after the L-SIG and other symbols after the first symbol, which is not limited in this application.

In the PPDU formats of 802.11a, 802.11ac, and 802.11ax, the first symbol after L-SIG is BPSK modulated. Therefore, in the present application, the first symbol after the L-SIG may adopt a QBPSK modulation method so as to be distinguished from 802.11a, 802.11ac, and 802.11ax, so that 802.11a, 802.11ac, and 802.11ax are distinguished based on the execution process shown in fig. 3, which is not described herein again.

In 802.11n, the first symbol (i.e., HT-SIG1) of the PDDU after L-SIG adopts QBPSK (Modulation and Coding Scheme), and the first field of HT-SIG1 is MCS (Modulation and Coding Scheme), and occupies the first 7 bits (bit), and the numerical range represented by the first 7 bits is [0, 76 ]. Therefore, the present application may set the value represented by at least the first 7 bits of the first symbol within a preset range different from a 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. Therefore, at least the first symbol containing the first symbol can distinguish the new and old standard protocol versions.

Specific numerical values in the preset range are not limited, and the preset range is different from the range of 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 satisfies the preset range, the value represented by the 7 bits or more than 7 bits of the first symbol is different, and the standard protocol version to which the PPDU represented by the first symbol conforms is different. Or, the values of the remaining bits in the first symbol except for the standard protocol version which the PPDU conforms to are different, and the standard protocol version which the PPDU conforms to is different from that which the first symbol conforms to. The present application is not limited to the above two implementations to determine the standard protocol version followed by the PPDU represented by the first symbol.

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 first symbol represents the PPDU is a 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 the PPDU is compliant is standard protocol version B. It should be noted that, the values represented by at least the first 7 bits of the first symbol are different, and the standard protocol version complied with by the PPDU may also be the same, which is not limited in this application.

As will be understood by those skilled in the art, the types of PDDUs of the standard protocol versions may be different, and each standard protocol version may have a different type of PDDU, so that, in order to distinguish the types of PPDUs, the present application may divide the preset range 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 a value within a predetermined range [77, 127], where the predetermined range includes: two value intervals of [77, 102] and [103, 127], the value interval [77, 102] corresponding to type 1 of PPDU, and the value interval [103, 127] corresponding to type 2 of PPDU. Then, the present application may determine that the first symbol represents type 1 of the 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 [77, 102 ]. The present application may determine that the first symbol represents type 2 of the 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 ].

It should be noted that, in addition to the foregoing manner, the present application may also determine the type of the PPDU in the standard protocol version that the PPDU indicated by the first symbol conforms to by using the value and/or the numerical value indicated by the remaining one or more bits of the first symbol except for indicating the standard protocol version that the PPDU conforms to, which is not limited in this application.

The type of PPDU is not limited in this application. Optionally, the type of PPDU may include: the system comprises 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 at least one of an XX-SIG PPDU such as 20M or 40M or other numerical size, wherein the 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, and the like, wherein the field represents an information basic field formed by one or more bits.

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. 6 a. For convenience of illustration, in fig. 6a, the format of the PPDU of the present application is a PPDU of a new standard protocol version, and the first symbol in the PPDU includes one symbol for example.

As shown in fig. 6a, in the present application, part of the contents of the format of the PPDU of the new standard protocol version may sequentially include: the system comprises L-STF, L-LTF, L-SIG and XX information symbols (XX SIGNAL, XX-SIG) A0, wherein XX-SIG A0 is the first symbol after L-SIG, and XX-SIG A0 adopts a modulation mode of QBPSK, namely the first symbol is XX-SIG A0.

As will be appreciated by those skilled in the art, in 802.11 technology, one SIG typically comprises 24 or 26 bits. Therefore, as shown in fig. 6b, in 24 bits of XX-SIG a0, at least the first 7 bits are used as PPDU identifier bits, and the value represented by the at least the first 7 bits is set within 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, so as to achieve the purpose of using XX-SIG a0 as a PPDU Marker symbol. In FIG. 6b, the values represented by the first 7 bits of XX-SIG A0 are shown as examples in a predetermined range of 77 or more and 127 or less.

Based on the above, with reference to fig. 3, fig. 6a and fig. 6b, the specific process for distinguishing 802.11a, 802.11n, 802.11ac, 802.11ax and the new standard protocol version may include:

modulation scheme// condition 4 for BPSK in the first symbol after IF L-SIG

The PPDU is a PPDU of 802.11a/802.11ac/802.11ax (distinguished by implementing condition 2 and condition 3 in FIG. 3, which is not described herein again)

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

The PPDU is a PPDU of 802.11n

ELSE

The PPDU is a PPDU of a new standard protocol version

It should be noted that, in addition to the above-mentioned manner, condition 4 may be replaced by a modulation manner in which the first symbol after L-SIG is QBPSK, condition 5 may be replaced by a modulation manner in which the first 7 bits of the first symbol after L-SIG are within [77, 127], and the two manners of condition 4 and the two manners of condition 5 may be arbitrarily combined, which is not limited in this application.

In summary, the phase rotation of the QBPSK of the first symbol after the L-SIG in the PPDU of the present application is to be distinguished from PPDUs of 802.11a, 802.11ac, and 802.11ax, and then the numerical 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 a range greater than or equal to 0 and less than or equal to 76, and the first symbol at least including the first symbol after the L-SIG is to be distinguished from a PPDU of 802.11n, so as to achieve the purpose of identifying the format of a PPDU of a new generation of protocol standard version.

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

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

The specific content of the second symbol is not limited in the present 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 illustration, continuing with fig. 6a, the second symbol is XX-SIG a1 in fig. 6a, where XX-SIG a1 adopts BPSK modulation scheme, so as to further distinguish from the PPDU of 802.11n, and ensure accuracy of the protocol standard version to which the PDDU determined by the first symbol conforms.

Continuing with 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 version of the standard protocol to which the PPDU conforms, for a common information field (COM-SIG) representing the PPDU for providing information related to the PPDU.

The specific content of the public information field is not limited in the present application. Optionally, the common information field may include: at least one of a type (type) field of the PPDU, a transmission opportunity (TXOP) field, a Tail (Tail) field, a Color (Color) field of a Basic Service Set (BSS), an Uplink (UL)/DownLink (DL) field, an other identification (identifier) field of the PPDU, a Cyclic Redundancy Check (CRC) field, or a BandWidth (BandWidth, BW) field. In addition, the bit of the second symbol may also be used to represent common information of a 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 greater than or equal to 77 and less than or equal to 127, then, with reference to fig. 7a to 7g, specific contents of XX-SIG a0 are exemplified by using 7 feasible implementation manners.

As shown in fig. 7a, XX-SIG a0 may include, in order from LSB to MSB: PPDU identifier bits (7 bits in total from 0 th bit to 6 th bit), PPDU type bits (4 bits in total from 7 th bit to 10 th bit), TXOP bits (7 bits in total from 11 th bit to 17 th bit), and Tail bits (6 bits in total from 18 th bit to 23 th bit).

As shown in fig. 7b, XX-SIG a0 may include, in order from LSB to MSB: PPDU identifier bits (7 bits in total from 0 th bit to 6 th bit), PPDU type bits (5 bits in total from 7 th bit to 11 th bit), BSS Color bits (6 bits in total from 12 th bit to 17 th bit), and Tail bits (6 bits in total from 18 th bit to 23 th bit).

As shown in fig. 7c, XX-SIG a0 may include, in order from LSB to MSB: PPDU identifier bits (7 bits in total from 0 th bit to 6 th bit), BSS Color bits (6 bits in total from 7 th bit to 12 th bit), UL/DL bits (13 th bit, 1bit in total), CRC bits (4 bits in total from 14 th bit to 17 th bit), and Tail bits (6 bits in total from 18 th bit to 23 th bit).

As shown in fig. 7d, XX-SIG a0 may include, in order from LSB to MSB: PPDU identifier bits (7 bits in total from 0 th bit to 6 th bit), TXOP bits (7 bits in total from 7 th bit to 13 th bit), CRC bits (4 bits in total from 14 th bit to 17 th bit), and Tail bits (6 bits in total from 18 th bit to 23 th bit).

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 7 bits), BSS Color bits (from bit 7 to bit 12, total 6 bits), BW bits (from bit 13 to bit 14, total 2 bits), UL/DL bits (bit 15, total 1 bit), PPDU type bits (from bit 16 to bit 19, total 4 bits), and CRC bits (from bit 20 to bit 23, total 4 bits).

As shown in fig. 7f, XX-SIG a0 may include, in order from LSB to MSB: PPDU identifier bits (7 bits in total from 0 th bit to 6 th bit), TXOP bits (7 bits in total from 7 th bit to 13 th bit), BSS Color bits (6 bits in total from 14 th bit to 19 th bit), and CRC bits (4 bits in total from 20 th bit to 23 th bit).

As shown in fig. 7g, XX-SIG a0 may include, in order from LSB to MSB: PPDU identifier bits (7 bits in total from 0 th bit to 6 th bit), BSS Color bits (6 bits in total from 7 th bit to 12 th bit), TXOP bits (7 bits in total from 13 th bit to 19 th bit), and CRC bits (4 bits in total from 20 th bit to 23 th bit).

It should be noted that the specific implementation manner of XX-SIG a0 is not limited to the above manner.

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 to be the QBPSK modulation mode, and the value represented by at least the first 7 bits of the first symbol is within a preset range different from a range which is greater than or equal to 0 and less than or equal to 76, the first symbol at least contains the first symbol located after the L-SIG, so that the PPDU of a new standard protocol version can be effectively identified, and meanwhile, the distinction of the PPDUs of the new and old standard protocol versions is supported, and the L-SIG is not simply repeated, the remaining 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 be represented by one or more symbols according to a standard protocol version that the PPDU conforms to, and the first symbol may include multiple representations. Optionally, based on the existing PPDU format of each of 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 the first symbol after the L-SIG, and may also include the first symbol after the L-SIG and other symbols after the first symbol, which is not limited in this application.

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

The method can adopt 2 bits or more than 2 bits of the first symbol to express the standard protocol version complied by the PPDU, and only the value of the first 2 bits is required to be a preset value 11. For example, when the value of the first 2 bits of the first symbol is the preset value 11, the application may determine that the first symbol represents the standard protocol version that the PPDU complies with.

In order to be compatible with more new standard protocol versions, in the present application, on the basis that the values of the first 2 bits of the first symbol are the preset values 11, the values of the nth bit of the first symbol are different from the values of the third bit of the first symbol, the standard protocol versions that the PPDUs represented by the first symbol comply with are different, and N is a positive integer greater than 2. Or the values represented by the bits of the first symbol are different, and the standard protocol version complied with by the PPDU represented by the first symbol is different. The present application is not limited to the above two implementations to determine the standard protocol version followed by the PPDU represented by the first symbol.

For example, when the value of the 3 rd bit of the first symbol is 0, the standard protocol version complied with by the PPDU is a standard protocol version a; when the value of the 3 rd bit of the first symbol is 1, the standard protocol version followed by the PPDU is standard protocol version B. It should be noted that, starting from the third bit of the first symbol, the value of the mth bit of the first symbol is different, and the standard protocol version complied with by the PPDU may also be the same, which is not limited in this application.

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

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

It should be noted that, in addition to the foregoing manner, the present application may also determine the type of the PPDU in the standard protocol version that the PPDU indicated by the first symbol conforms to by using a value and/or a value indicated by one or more remaining bits of the first symbol except for indicating the standard protocol version that the PPDU conforms to, which is not limited in this application.

The type of PPDU is not limited in this application. Optionally, 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 (Multi-Link) PPDU, a Single-Link (Single-Link) PPDU, or an XX-SIG PPDU such as 20M or 40M or other numerical size.

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. 8 a. For convenience of illustration, in fig. 8a, the format of the PPDU of the present application is a PPDU of a new standard protocol version, and the first symbol in the PPDU includes one symbol for example.

As shown in fig. 8a, in the present application, part of the contents of the format of the PPDU of the new standard protocol version may include in turn: the signal source comprises an L-STF, an L-LTF, an L-SIG and an XX-SIG A0, wherein XX-SIG A0 is a first symbol behind the L-SIG, and XX-SIG A0 adopts a QBPSK modulation mode, namely the first symbol is XX-SIG A0.

As will be appreciated by those skilled in the art, in 802.11 technology, one SIG typically comprises 24 or 26 bits. Therefore, as shown in fig. 8b, in 24 bits of XX-SIG a0, at least the first 2 bits are used as PPDU identifier bits, and the value of at least the first 2 bits is the preset value 11, so as to achieve the purpose of using XX-SIG a0 as a PPDU Marker symbol. In fig. 8b, the values of the first 2 bits of XX-SIG a0 are preset values 11 for illustration.

Based on the above, with reference to fig. 3, 8a and 8b, the specific process for distinguishing 802.11a, 802.11n, 802.11ac, 802.11ax and the new standard protocol version may include:

modulation scheme// condition 6 for BPSK in the first symbol after IF L-SIG

The first 2 bits of the first symbol after the ELSEIF L-SIG do not take on the value of 11// Condition 7

The PPDU is a PPDU of 802.11n

ELSE

The PPDU is a PPDU of a new standard protocol version

It should be noted that, in addition to the foregoing manners, the condition 6 may also be replaced by a modulation manner in which the first symbol after the L-SIG is QBPSK, the condition 7 may also be replaced by a modulation manner in which the first 2 bits of the first symbol after the L-SIG are 11, and the two manners of the condition 6 may be arbitrarily combined with the two manners of the condition 7, which is not limited in this application.

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

The specific content of the second symbol is not limited in the present 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 illustration, continuing with fig. 7a, the second symbol is XX-SIG a1 in fig. 7a, wherein XX-SIG a1 adopts BPSK modulation, so as to further distinguish from the PPDU of 802.11n, and ensure accuracy of the protocol standard version to which the PDDU determined by the first symbol conforms.

Continuing with 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 version of the standard protocol to which the PPDU conforms, for a common information field (COM-SIG) representing the PPDU for providing information related to the PPDU.

The specific content of the public information field is not limited in the present application, and optionally, the public information field may include: at least one of a type (type) field of the PPDU, a transmission opportunity (TXOP) field, a Tail (Tail) field, a Color (Color) field of a Basic Service Set (BSS), an Uplink (UL)/DownLink (DL) field, an other identification (identifier) field of the PPDU, a Cyclic Redundancy Check (CRC) field, or a BandWidth (BandWidth, BW) field. In addition, the bit of the second symbol may also be used to represent common information of a 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 used as PPDU identifier bits, and the value of the first 2 bits is the preset value 11, then, with reference to fig. 9a to 9g, 7 feasible implementation manners are adopted to exemplify the specific content of XX-SIG a 0.

As shown in fig. 9a, XX-SIG a0 may include, in order from LSB to MSB: PPDU identifier bits (from 0 th bit to 1 st bit, total 2 bits), other identifier bits of PPDU (from 2 nd bit to 6 th bit, total 5 bits), PPDU type bits (from 7 th bit to 11 th bit, total 5 bits), BSS Color bits (from 12 th bit to 17 th bit, total 6 bits), and Tail bits (from 18 th bit to 23 th bit, total 6 bits).

As shown in fig. 9b, XX-SIG a0 may include, in order from LSB to MSB: PPDU identifier bits (from 0 th bit to 1 st bit, total 2 bits), other identifier bits of PPDU (from 2 nd bit to 6 th bit, total 5 bits), PPDU type bits (from 7 th bit to 10 th bit, total 4 bits), TXOP bits (from 11 th bit to 17 th bit, total 7 bits), and Tail bits (from 18 th bit to 23 th bit, total 6 bits).

As shown in fig. 9c, XX-SIG a0 may include, in order from LSB to MSB: PPDU identifier bits (from 0 th bit to 1 st bit, total 2 bits), other identifier bits of PPDU (from 2 nd bit to 6 th bit, total 5 bits), BSS Color bits (from 7 th bit to 12 th bit, total 6 bits), UL/DL bits (13 th bit, total 1 bit), CRC bits (from 14 th bit to 17 th bit, total 4 bits), and Tail bits (from 18 th bit to 23 th bit, total 6 bits).

As shown in fig. 9d, XX-SIG a0 may include, in order from LSB to MSB: PPDU identifier bits (from 0 th bit to 1 st bit, total 2 bits), other identifier bits of PPDU (from 2 nd bit to 6 th bit, total 5 bits), TXOP bits (from 7 th bit to 13 th bit, total 7 bits), CRC bits (from 14 th bit to 17 th bit, total 4 bits), and Tail bits (from 18 th bit to 23 th bit, total 6 bits).

As shown in fig. 9e, XX-SIG a0 may include, in order from LSB to MSB: PPDU identifier bits (from 0 th bit to 1 st bit, total 2 bits), other identifier bits of PPDU (from 2 nd bit to 4 th bit, total 3 bits), TXOP bits (from 5 th bit to 11 th bit, total 7 bits), BSS Color bits (from 12 th bit to 17 th bit, total 6 bits), and Tail bits (from 18 th bit to 23 th bit, total 6 bits).

As shown in fig. 9f, XX-SIG a0 may include, in order from LSB to MSB: PPDU identifier bits (from 0 th bit to 1 st bit, total 2 bits), other identifier bits of the PPDU (from 2 nd bit to 4 th bit, total 3 bits), TXOP bits (from 5 th bit to 11 th bit, total 7 bits), BW bits (from 12 th bit to 13 th bit, total 2 bits), CRC bits (from 14 th bit to 17 th bit, total 4 bits), and Tail bits (from 18 th bit to 23 th bit, total 6 bits).

As shown in fig. 9g, XX-SIG a0 may include, in order from LSB to MSB: PPDU identifier bits (from 0 th bit to 1 st bit, total 2 bits), other identifier bits of PPDU (from 2 nd bit to 4 th bit, total 3 bits), BSS Color bits (from 5 th bit to 10 th bit, total 6 bits), UL/DL bits (11 th bit, total 1 bit), BW bits (from 12 th bit to 13 th bit, total 2 bits), CRC bits (from 14 th bit to 17 th bit, total 4 bits), and Tail bits (from 18 th bit to 23 th bit, total 6 bits).

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 behind the L-SIG is set to be the QBPSK modulation mode, at least the first 2 bits of the first symbol are set to be the preset value 11, the first symbol at least contains the PPDU behind the L-SIG, which can effectively identify the new standard protocol version, and simultaneously supports the distinction of the PPDU of the new and old standard protocol versions, and is not the simple repeated 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 III

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

In the PPDU formats of 802.11a, 802.11ac, and 802.11ax, the first symbol after L-SIG is BPSK modulated. In the format of PPDU of 802.11n, the first symbol after L-SIG is modulated by QBPSK. Therefore, the first symbol after the L-SIG in this application may adopt BPSK modulation scheme to distinguish from 802.11 n.

And because the first symbol after the L-SIG is not a repeated L-SIG (i.e., RL-SIG) in the PPDU format of 802.11a and 802.11ac, respectively. In the 802.11ax PPDU format, the first symbol after the L-SIG is a repeated L-SIG. Therefore, the first symbol after L-SIG in this application can be set as RL-SIG to distinguish from 802.11a and 802.11ac, so that based on the content shown in fig. 3, the second symbol after L-SIG is judged to adopt QBPSK modulation to distinguish 802.11a from 802.11 ac.

In the PPDU format of 802.11ax, the second, third, and fourth symbols following the L-SIG all use BPSK modulation. Therefore, one or more third symbols following the first symbol in the present application may use QBPSK modulation to distinguish them from 802.11 ax. Thus, at least the first symbol comprising the first symbol and the at least one second symbol can distinguish between the new and the old standard protocol versions.

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

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

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 that, in order to distinguish different PPDU types, in the present application, the value and/or the value represented by one or more bits in the at least one third symbol is different, and the PPDU type 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, at least one bit represents a different value and the PPDU type is different. Or, the value of at least one bit is different from the value represented by the bit, and the type of the PPDU is different. The above process may refer to the contents 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 again.

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. 10a to 10 d. For convenience of illustration, in fig. 10a to 10d, the format of the PPDU of the present application is illustrated by taking a PPDU that is a new standard protocol version as an example.

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

In fig. 10a, XX-SIG a0 and XX-SIG a1 both use QBPSK modulation when the first symbol in the PPDU includes a third symbol. In fig. 10b, XX-SIG a0 adopts QBPSK modulation, and XX-SIG a1 adopts BPSK modulation. In fig. 10c, XX-SIG a0 adopts BPSK modulation, and XX-SIG a1 adopts QBPSK modulation.

As shown in fig. 10d, in the present application, part of the contents of the format of the PPDU of the new standard protocol version may include: the first symbol includes L-STF, L-LTF, L-SIG, RL-SIG and XX-SIG a0, where RL-SIG is repeated L-SIG, RL-SIG employs BPSK modulation, RL-SIG is the first symbol after L-SIG, XX-SIG a0 employs QBPSK modulation, XX-SIG a0 is the third symbol after the first symbol, that is, the first symbol includes: RL-SIG and XX-SIG A0.

As will be appreciated by those skilled in the art, in 802.11 technology, one SIG typically comprises 24 or 26 bits. Therefore, as shown in fig. 10e, the first 4 bits of the 24 bits of XX-SIG a0 and/or XX-SIG a1 are taken as PPDU identifier bits for illustration, so as to achieve the purpose of using XX-SIG a0 and/or XX-SIG a1 as PPDU Marker symbols.

Based on the above, with reference to fig. 10 a-10 d and 10e, the specific process for distinguishing 802.11a, 802.11n, 802.11ac, 802.11ax and the new standard protocol version may include:

modulation scheme// condition 8 for BPSK in the first symbol after IF L-SIG

The PPDU is a PPDU of 802.11a/802.11ac/802.11 ax/new standard protocol version (distinguished by executing condition 2 and condition 3 in FIG. 3, which is not described herein again)

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

The PPDU is a PPDU of 802.11a/802.11ac

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

The PPDU is a PPDU of 802.11ac

ELSE

The PPDU is a PPDU of 802.11a

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

The PPDU is a PPDU of a new standard protocol version

ELSE

The PPDU is a PPDU with 802.11ax

ELSE

The PPDU is a PPDU of 802.11n

It should be noted that, in addition to the above-described manners, the condition 8 may be replaced by a modulation manner in which the first symbol after the L-SIG is QBPSK, the condition 9 may be replaced by a modulation manner in which the first symbol after the L-SIG is RL-SIG, the condition 10 may be replaced by a modulation manner in which the second symbol after the L-SIG is BPSK, the condition 11 may be replaced by a modulation manner in which the second symbol and the third symbol after the L-SIG are both BPSK, and the two manners of the condition 8, the two manners of the condition 9, the two manners of the condition 10, and the two manners of the condition 11 may be arbitrarily combined, which is not limited in this application.

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

With continued reference to fig. 10e, the present application may use the remaining one or more bits of at least one third symbol (i.e., XX-SIG a0 and/or XX-SIG a1) following the first symbol, except for the bits representing the version of the standard protocol to which the PPDU conforms, for a common information field (COM-SIG) representing the PPDU for providing information about the PPDU.

The specific content of the public information field is not limited in the present application, and optionally, the public information field may include: at least one of a type (type) field of the PPDU, a transmission opportunity (TXOP) field, a Tail (Tail) field, a Color (Color) field of a Basic Service Set (BSS), an Uplink (UL)/DownLink (DL) field, an other identification (identifier) field of the PPDU, a Cyclic Redundancy Check (CRC) field, or a BandWidth (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, with reference to fig. 11a to 11e, 5 possible implementations are adopted to exemplify specific contents of XX-SIG a0 and/or XX-SIG a 1.

As shown in fig. 11a, in order from LSB to MSB, XX-SIG a0 and/or XX-SIG a1 may include, in order: PPDU identifier bits (4 bits in total from 0 th bit to 3 rd bit), TXOP (7 bits in total from 4 th bit to 10 th bit), BSS Color bits (6 bits in total from 11 th bit to 16 th bit), UL/DL bits (1 bit in total from 17 th bit to 23 th bit), and Tail bits (6 bits in total from 18 th bit to 23 th bit).

As shown in fig. 11b, in order from LSB to MSB, XX-SIG a0 and/or XX-SIG a1 may include, in order: PPDU identifier bits (4 bits in total from 0 th bit to 3 rd bit), TXOP (7 bits in total from 4 th bit to 10 th bit), BSS Color bits (6 bits in total from 11 th bit to 16 th bit), UL/DL bits (1 bit in total from 17 th bit to 23 th bit), and CRC bits (6 bits in total from 18 th bit to 23 th bit).

As shown in fig. 11c, in order from LSB to MSB, XX-SIG a0 and/or XX-SIG a1 may include, in order: PPDU identifier bits (4 bits in total from 0 th bit to 3 rd bit), TXOP (7 bits in total from 4 th bit to 10 th bit), BSS Color bits (6 bits in total from 11 th bit to 16 th bit), UL/DL bits (17 th bit, 1bit in total), BW bits (2 bits in total from 18 th bit to 19 th bit), and CRC bits (4 bits in total from 20 th bit to 23 th bit).

As shown in fig. 11d, in order from LSB to MSB, XX-SIG a0 and/or XX-SIG a1 may include, in order: PPDU identifier bits (4 bits in total from 0 th bit to 3 rd bit), BSS Color (6 bits in total from 4 th bit to 9 th bit), BW bits (2 bits in total from 10 th bit to 11 th bit), UL/DL bits (12 th bit, 1bit in total), R bits (13 th bit, 1bit in total), CRC bits (4 bits in total from 14 th bit to 17 th bit), and Tail bits (6 bits in total from 18 th bit to 23 th bit).

As shown in fig. 11e, in order from LSB to MSB, XX-SIG a0 and/or XX-SIG a1 may include, in order: PPDU identifier bits (4 bits in total from 0 th bit to 3 rd bit), TXOP (7 bits in total from 4 th bit to 10 th bit), BW bits (2 bits in total from 11 th bit to 12 th bit), UL/DL bits (13 th bit, 1bit in total), CRC bits (4 bits in total from 14 th bit to 17 th bit), and Tail bits (6 bits in total from 18 th bit to 23 th bit).

It should be noted that the specific implementation manners of XX-SIG a0 and/or XX-SIG a1 are not limited to the above manners, and the specific implementation manners of XX-SIG a0 and XX-SIG a1 may be the same or different, and are 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 present application, the first symbol after the L-SIG is set as the repeated L-SIG, the first symbol is set as a BPSK modulation mode, and the at least one third symbol after the first symbol is set as a QBPSK modulation mode, and the first symbol at least includes the first symbol after the L-SIG and the at least one third symbol after the first symbol, so that the PPDU of a new standard protocol version can be effectively identified, and meanwhile, the distinction of the PPDUs of new and old standard protocol versions is supported, the robustness of the 802.11 technology to delay spread is also maintained, and the remaining bits in the at least one third symbol can be freely subscribed, so that the efficiency of identifying the PPDU is improved, and richer protocol characteristics are supported.

Example four

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

In the PPDU format of 802.11ax, the second, third, and fourth symbols following the L-SIG all use BPSK modulation. Therefore, in the present application, by means of the implementation manners of the first embodiment and/or the second embodiment, the value of the bit of the at least one fourth symbol and/or the expressed numerical value are set. 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, so as to distinguish from 802.11 ax.

The specific size of the first value is not limited, and the first value is different from the value of the bit in the corresponding symbol in 802.11 ax. Such as: the method and the device can take the value of the uncommon bit in the 802.11ax as a first value. The specific size of the first numerical value is not limited, and the first numerical value is 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 less common bits in 802.11ax as the first value.

In addition, the standard protocol version complied with by the PPDU may also be represented by using values and/or represented numerical values of bits of one or more fourth symbols, and a specific process may refer to the description of the first embodiment and the second embodiment, which is not described herein again.

Those skilled in the art can understand that types of PDDUs of the standard protocol versions may be different, and each standard protocol version may have a different type of PDDU, so in order to distinguish different types of PPDUs, in the present application, values and/or numerical values of one or more bits in the at least one fourth symbol are different, types of PPDUs in the standard protocol version, which the PPDU represented by the first symbol conforms to, are different, and specific contents may refer to the description of the third embodiment, which is not described herein again.

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 illustration, in fig. 12, the format of the PPDU of the present application is a PPDU of a new standard protocol version, and the first symbol in the PPDU includes two fourth symbols for example.

As shown in fig. 12, in the present application, part of the contents of the format of the PPDU of the new standard protocol version may include: the method comprises the following steps of L-STF, L-LTF, L-SIG, RL-SIG, XX-SIG A0 and XX-SIG A1, wherein the RL-SIG is repeated L-SIG, the RL-SIG, XX-SIG A0 and XX-SIG A1 all adopt BPSK modulation modes, the RL-SIG is a first symbol located after the L-SIG, and the XX-SIG A0 and XX-SIG A1 are two fourth symbols located after the RL-SIG, namely the first symbol comprises: RL-SIG, XX-SIG A0, and XX-SIG A1.

As will be appreciated by those skilled in the art, in 802.11 technology, one SIG typically comprises 24 or 26 bits. Therefore, continuing with fig. 10e, the first 4 bits of the 24 bits of XX-SIG a0 and/or XX-SIG a1 are taken as PPDU identifier bits for illustration, so as to achieve the purpose of XX-SIG a0 and/or XX-SIG a1 as PPDU Marker symbols.

Based on the above, with reference to fig. 3, 12 and 10e, the specific process for distinguishing 802.11a, 802.11n, 802.11ac, 802.11ax and the new standard protocol version may include:

modulation scheme// condition 12 for BPSK of the first symbol after IF L-SIG

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

The PPDU is a PPDU of 802.11a/802.11ac

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

The PPDU is a PPDU of 802.11ac

ELSE

The PPDU is a PPDU of 802.11a

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

The first four bits of the second symbol and/or the third symbol represent the first value// condition 15

The PPDU is a PPDU of a new standard protocol version

ELSE

The PPDU is a PPDU with 802.11ax

ELSE

The PPDU is a PPDU of 802.11n

It should be noted that, in addition to the foregoing manners, the condition 12 may also be replaced by a modulation manner in which the first symbol after the L-SIG is QBPSK, the condition 13 may also be replaced by a modulation manner in which the first symbol after the L-SIG is RL-SIG, the condition 14 may also be replaced by a modulation manner in which the second symbol after the L-SIG is BPSK, the condition 15 may also be replaced by a modulation manner in which the first four bits in the second symbol and the third symbol after the L-SIG take values other than the first values, and the arrays represented by the first four bits in the second symbol and the third symbol are not the first values, and the two manners of the condition 12, the two manners of the condition 13, the two manners of the condition 14, and the two manners of the condition 15 may be arbitrarily combined, which is not limited in this application.

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

With continued reference to fig. 10e, the present application may use the remaining one or more bits of at least one fourth symbol (i.e., XX-SIG a0 and/or XX-SIG a1) following the first symbol, except for the bits representing the version of the standard protocol to which the PPDU conforms, for a common information field (COM-SIG) representing the PPDU for providing information about 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, a first symbol located after the L-SIG is set as the repeated L-SIG, the first symbol is set as a BPSK modulation scheme, at least one fourth symbol located after the L-SIG is set as a BPSK modulation scheme, and a value of at least one bit of the at least one fourth symbol is a first value, or a value represented by at least one bit of the at least one fourth symbol is a first value, by means of the first symbol including at least the first symbol located after the L-SIG and the at least one fourth symbol located after the first symbol, a PPDU of a new standard protocol version can be effectively identified, and at the same time, the distinction of PPDUs of new and old standard protocol versions is supported, and the robustness of the 802.11 technology to delay spread is also maintained, and the rest bits in the fourth symbol can be freely subscribed, so that the efficiency of identifying the PPDU is improved, and richer protocol characteristics are supported.

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

As shown in fig. 13, the transmission apparatus 100 of a physical layer protocol data unit PPDU of the present application may include: an acquisition module 101 and a sending 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, and the first symbol is used to indicate a standard protocol version compliant with the PPDU;

a sending module 102, configured to send the PPDU to a receiving apparatus, so that the receiving apparatus determines a standard protocol version compliant with the PPDU based on the first symbol.

The transmission apparatus for a physical layer protocol data unit PPDU according to the embodiment of the present application may be configured to implement the technical solution in the embodiment of the transmission method for a physical layer protocol data unit PPDU, and implement principles and technical effects thereof are similar, which are not described herein again.

Illustratively, the present application provides an apparatus for transmitting a physical layer protocol data unit PPDU. Fig. 14a is a schematic structural diagram of a transmission apparatus of a physical layer protocol data unit PPDU according to an embodiment of the present application, and as shown in fig. 14a, the transmission apparatus 200 of the physical layer protocol data unit PPDU generally refers to a receiving apparatus, and the receiving apparatus 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 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) through software and/or hardware operations corresponding to the receiving apparatus in an embodiment of a transmission method for implementing any of the above-mentioned physical layer protocol data unit PPDU. In addition, the receiving device may also be a portable, pocket, hand-held, computer-embedded, wearable, or vehicle-mounted wireless communication device. The receiving device may further include, but is not limited to, a wireless Access Point (AP), where the AP may also be referred to as an access point, a bridge, a hot spot, or the like in the WLAN, an optical network device (ONT), a router, or the like. As shown in fig. 14a, the apparatus 200 for transmitting a 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 apparatus, where the PPDU includes a legacy information symbol L-SIG and a first symbol located after the L-SIG, and the first symbol is used to indicate a standard protocol version compliant with the PPDU;

a determining module 202 for determining a standard protocol version to which the PPDU conforms based on the first symbol.

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 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; determining 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.

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

A demodulation module 203, configured to demodulate the PPDU based on the standard protocol version complied with by the PPDU.

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 apparatus of the physical layer protocol data unit PPDU shown in fig. 13 is configured to implement the operation of the sending apparatus through software and/or hardware in the embodiment of the transmission method of any physical layer protocol data unit PPDU, and the transmission apparatus of the physical layer protocol data unit PPDU shown in fig. 14a to 14b is configured to implement the operation of the receiving apparatus through software and/or hardware in the embodiment of the transmission method of any physical layer protocol data unit PPDU.

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

Exemplarily, the present application further provides a communication device, fig. 15 is a schematic hardware structure diagram of the communication device provided in an embodiment of the present application, as shown in fig. 15, the communication device 300 is configured to implement any of the above method embodiments corresponding to the operation of the sending apparatus and/or the receiving apparatus through software and/or hardware, and 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 code;

the processor 302 calls program code, and when the program code is 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 description relating to the method embodiments described above.

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

The communication device of the present application may be configured to implement the technical solution in the embodiment of the transmission method for a physical layer protocol data unit PPDU, and the implementation principle and the technical effect thereof are similar and will not be described herein again.

In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described embodiments of the apparatus are merely illustrative, and for example, the division of the modules is only one logical division, and the actual implementation may have another division, for example, a plurality of modules may be combined or may be integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or modules, and may be in an electrical, mechanical or other form.

Modules described as separate parts may or may not be physically separate, and parts displayed as modules may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of the embodiments of the present application.

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

The integrated module implemented in the form of a software functional module may be stored in a computer-readable storage medium. The software functional module is stored in a storage medium and includes several instructions to enable a computer device (which may be a personal computer, a server, or a network device) or a processor (processor) to execute some steps of the methods according to the embodiments of the present application.

It should be understood that the processor may be a Central Processing Unit (CPU), other general purpose processor, a Digital Signal Processor (DSP), an 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, or in a combination of the hardware and software modules within the processor.

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

The bus may be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, an Extended ISA (EISA) bus, or the like. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, the buses in the figures of the present application are not limited to only one bus or one type of bus.

The present application further provides a readable storage medium, where an execution instruction is stored in the readable storage medium, 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 the foregoing method embodiment.

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

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 instruction from the readable storage medium, and the execution of the execution instruction by the at least one processor causes the communication device to implement the transmission method of the physical layer protocol data unit PPDU in the above-described method embodiment.

Those of ordinary skill in the art will understand that: in the above embodiments, the implementation may be wholly or partially realized 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. The procedures or functions according to the embodiments of the present application are all or partially generated when the computer program instructions are loaded and executed on a computer. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, the computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center by wire (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wirelessly (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device, such as a server, a data center, etc., that incorporates one or more of the 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)), among others.

Claims

1. A method for transmitting a physical layer protocol data unit (PPDU), comprising:

2. A method for transmitting a physical layer protocol data unit (PPDU), comprising:

3. The method of claim 2, wherein when the PPDU further includes legacy short training symbols L-STF and legacy long training symbols L-LTF, the method further comprises:

4. A method according to claim 2 or 3, characterized in that the method further comprises:

5. A transmission apparatus of PPDU (physical layer protocol data unit), applied to a transmission apparatus, the apparatus comprising:

6. A transmission apparatus of PPDU (physical layer protocol data unit), applied to a receiving apparatus, the apparatus comprising:

7. The apparatus of claim 6, wherein when a legacy short training symbol (L-STF) and a legacy long training symbol (L-LTF) are further included in the PPDU, 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 operating on the L-STF and the L-LTF; determining 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.

8. The apparatus of claim 6 or 7, further comprising:

9. The method according to any one of claims 1 to 4, or the device according to any one of claims 5 to 8,

the first symbol at least comprises a first symbol positioned after the L-SIG, the first symbol adopts a modulation mode of Quadrature Binary Phase Shift Keying (QBPSK), the numerical 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.

10. The method or apparatus of claim 9,

the predetermined range is equal to or greater than 77 and equal to or less than 127.

11. The method or apparatus of claim 9 or 10,

the preset range comprises a plurality of value intervals, the value intervals of the values represented by at least the first 7 bits of the first symbol are different, and the types of the PPDUs in the standard protocol version which the PPDU represented by the first symbol conforms to are different.

12. The method according to any one of claims 1 to 4, or the device according to any one of claims 5 to 8,

the first symbol at least comprises a first symbol positioned after the L-SIG, 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.

13. The method or apparatus of claim 12,

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

14. The method or apparatus of any of claims 9-13,

the PPDU further includes a second symbol located after the first symbol, where the second symbol uses a binary phase shift keying BPSK modulation scheme.

15. The method according to any one of claims 1 to 4, or the device according to any one of claims 5 to 8,

the first symbol at least comprises a first symbol positioned after the L-SIG and at least one third symbol positioned after the first symbol, wherein 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); and the at least one third symbol adopts a modulation mode of quadrature binary phase shift keying QBPSK.

16. The method or apparatus of claim 15,

at least one bit of the third symbol has different values and/or numerical values, and the type of the PPDU in the standard protocol version which the PPDU represented by the first symbol conforms to is different.

17. The method or apparatus of any of claims 1-4,

the first symbol at least comprises a first symbol positioned after the L-SIG and at least one fourth symbol positioned after 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.

18. The method or apparatus of claim 17,

at least one bit of the fourth symbol has different values and/or numerical values, and the type of the PPDU in the standard protocol version to which the PPDU represented by the first symbol conforms is different.

19. The method or apparatus of claim 11, 13, 16 or 18,

the type of PPDU comprises: 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 Multi-Link PPDU, a Single-Link Single-Link PPDU, or a standard protocol version related information field XX-SIG PPDU.

20. The method or apparatus of any of claims 9-19,

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

21. The method or apparatus of claim 20, wherein the common information field comprises: at least one of a type field of the PPDU, a transmission opportunity TXOP field, a Tail Tail field, a Color field of a basic service set BSS, an uplink UL/downlink DL field, other identification identifier field of the PPDU, a Cyclic Redundancy Check (CRC) field, or a bandwidth BW field.

22. A communication system, comprising: a transmission apparatus for a physical layer protocol data unit PPDU according to any one of claims 5 and 9 to 21 and a transmission apparatus for a physical layer protocol data unit PPDU according to any one of claims 6 to 21.

23. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, implements the method for transmission of a physical layer protocol data unit, PPDU, according to any one of claims 1, 9 to 21, or which, when being executed by a processor, implements the method for transmission of a physical layer protocol data unit, PPDU, according to any one of claims 2 to 4, 9 to 21.

24. 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 method for transmission of a physical layer protocol data unit, PPDU, of any of claims 1, 9-21 via execution of the executable instructions.

25. 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 for transmission of a physical layer protocol data unit, PPDU, of any of claims 2-4, 9-21 via execution of the executable instructions.