CN107852641B

CN107852641B - Method and station for transmitting identifier

Info

Publication number: CN107852641B
Application number: CN201580082205.1A
Authority: CN
Inventors: 马征; 罗荻; 朱俊
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2015-08-06
Filing date: 2015-08-06
Publication date: 2020-04-28
Anticipated expiration: 2035-08-06
Also published as: CN107852641A; WO2017020299A1; WO2017020299A9

Abstract

The embodiment of the invention provides a method for transmitting identifiers in a wireless local area network, which comprises the following steps: the transmitting unit performs a return-to-zero convolutional encoding of the information sequence, wherein the identifier sequence is located at the front of the information sequence. And the sending unit compresses tail bits in the information sequence and embeds the tail bits into the associated ID for transmission. The embodiment of the invention also provides a corresponding site, and by applying the method and the site of the embodiment of the invention, the expenses of CRC sequences and tail bits are reduced, the efficiency of sending data streams is improved, and the performance is better compared with the performance of adopting tail-biting convolutional coding.

Description

Method and station for transmitting identifier

Technical Field

The present invention belongs to the field of communications technologies, and in particular, to a method and a station for transmitting an identifier.

Background

Convolutional codes are the preferred channel coding scheme for current WLAN standards (e.g., ieee802.11 ac). The convolutional encoder used in ieee802.11ac is shown in fig. 1. Its constraint length is 7 and code rate is 1/2. At the input end of the encoder, 60 bits are added to the end of the information sequence, and 12 tail bits are added to the output end.

In particular, convolutional codes are largely classified into return-to-zero convolutional codes and tail-biting convolutional codes. The former requires the addition of a 0 bit at the end of the information stream to force the state of the convolutional code to zero; the latter initializes the encoder with the bits of the user data packet itself so that the trellis starts and ends in one and the same state.

It is generally believed that return-to-zero convolutional codes perform better than tail-biting convolutional codes, but tail-biting convolutional codes do not require the transmission of any extra bits, while return-to-zero convolutional codes require the transmission of extra tail bits. In short frame applications, the rate loss caused by tail bits cannot be neglected. The return-to-zero convolutional code transmission scheme adopted by the ieee802.11ac standard is simple to directly transmit encoded data, i.e., bears the overhead caused by tail bits.

In the WLAN standard, the data transmission procedure between the AP and the STA is as follows.

The data packet sent by the AP designates the receiving STA in such a way that the data packet includes one or more user ID numbers, and each STA receiving the data packet uses the local user ID number to be xored with the user ID number in the received data packet. If the exclusive or result of STA1 is all 0, it indicates that the packet is sent to STA 1; if the xor result is not all 0 s, it indicates that the packet is not addressed to STA1, and STA1 discards the packet.

Since the STA knows its own user ID at the receiving end, the AP may embed some information into the user ID of the transmitted packet at the transmitting end. The embedded information is decoded by the local user ID at the receiving terminal STA, so that the code word overhead of transmitting the information stream can be reduced.

At present, there is a technical scheme of Build-In CRC, which is to xor a CRC redundancy check code with a user ID In a user data packet at a transmitting end, solve the CRC with the user ID of an STA at the receiving end, and then perform CRC check.

The technical scheme can be matched with tail-biting convolutional codes, reduces the overhead of CRC code words when the data stream is sent, further reduces the overhead of tail bits, and improves the efficiency of sending the data stream.

However, tail-biting convolutional codes perform worse than return-to-zero convolutional codes, and their decoders are more complex than return-to-zero convolutional codes.

Disclosure of Invention

In view of this, the present invention provides a method and an apparatus for transmitting an identifier, which are used to reduce overhead of tail bits and improve efficiency of transmitting a data stream.

In a first aspect, an embodiment of the present invention provides a method for transmitting an identifier, which is applied to a wireless local area network WLAN, and includes:

selecting a partial bit of an identifier sequence of a first information sequence to be exclusive-ORed with a Cyclic Redundancy Code (CRC), wherein the identifier sequence is located at the head of the first information sequence;

carrying out return-to-zero convolutional coding on the first information sequence subjected to the exclusive or operation to obtain a second information sequence;

m bits of a protocol specified position in the second information sequence are selected, the m bits of the protocol specified position are compressed into n bits, n is an even number larger than 0, and m is larger than n;

XOR the compressed n bits with the first n bits of the second information sequence;

deleting m bits of the protocol specified position to obtain a third information sequence, wherein the third information sequence is positioned in an efficient signaling field HE-SIG of a physical layer protocol data unit PPDU;

and transmitting the third information sequence.

With reference to the first aspect, in a first possible implementation manner of the first aspect, the selecting m bits of a protocol-specified position in the second information sequence, and compressing the m bits of the protocol-specified position into n bits includes: and compressing 12 bits of the protocol-specified position in the second information sequence into 6 bits.

With reference to the first possible implementation manner of the first aspect, in a second possible implementation manner of the first aspect, the protocol specifies m bits of the position, and includes: and the tail m bits of the second information sequence.

In a second aspect, an embodiment of the present invention provides a method for transmitting an identifier, which is applied to a wireless local area network WLAN, and includes:

receiving a first information sequence, wherein the first information sequence is located in an efficient signaling field (HE-SIG) of a physical layer protocol data unit (PPDU);

coding a first part of bits in the local identifier sequence to obtain a first coding subsequence of n bits, wherein the number of the first part of bits is n/2, and n is an even number greater than 0;

performing soft xor processing on the first encoded subsequence and soft values of first n bits of the first information sequence to obtain a first subsequence, wherein the soft xor processing comprises: soft values are reserved on the corresponding bits of the bits of '0' in the coding subsequence, and the soft values on the corresponding bits of the bits of '1' in the coding subsequence are inverted;

transforming the first subsequence of n bits to obtain a second subsequence of m bits, wherein m is an integer greater than 0, and m is greater than n;

transforming the first information sequence to obtain a second information sequence, comprising: replacing the first coding subsequence with the first information sequence by n bits, and placing the second subsequence at the tail of the first information sequence;

decoding the second information sequence, and performing XOR on a second part of bits in the local identifier sequence and part of bits of the decoded second information sequence to obtain a CRC sequence;

determining the decoded second information sequence, comprising: the CRC sequence is verified, and the first part of bits in the local identifier sequence is compared with the first n/2 bits of the decoded second information sequence.

In a third aspect, an embodiment of the present invention provides a method for transmitting an identifier, where the method is applied to a wireless local area network WLAN, and the method includes:

selecting n bits of a protocol specified position in a second information sequence, and carrying out exclusive OR on the n bits of the protocol specified position and the first n bits of the second information sequence, wherein n is an integer greater than 0;

deleting n bits of the protocol specified position to obtain a third information sequence, wherein the third information sequence is positioned in an efficient signaling field HE-SIG of a physical layer protocol data unit PPDU;

and transmitting the third information sequence.

With reference to the third aspect, in a first possible implementation manner of the third aspect, the n bits of the protocol-specified position include: and the tail n bits of the second information sequence.

In a fourth aspect, an embodiment of the present invention provides a method for transmitting an identifier, where the method is applied to a wireless local area network WLAN, and the method includes:

coding a first part of bits in the local identifier sequence to obtain a coding subsequence with n bits, wherein the number of the first part of bits is n/2, and n is an even number greater than 0;

performing soft xor processing on the encoded subsequence and soft values of first n bits of the first information sequence to obtain a first subsequence, wherein the soft xor processing comprises: soft values are reserved on the corresponding bits of the bits of '0' in the coding subsequence, and the soft values on the corresponding bits of the bits of '1' in the coding subsequence are inverted;

transforming the first information sequence to obtain a second information sequence, comprising: placing the first subsequence at the tail of the first information sequence, and replacing the first n bits of the first information sequence by the coding subsequence;

In a fifth aspect, an embodiment of the present invention provides a method for transmitting an identifier, where the method is applied to a wireless local area network WLAN, and the method includes:

carrying out zero-returning convolution coding on a first information sequence to obtain a second information sequence, wherein an identifier sequence is positioned at the front part of the first information sequence;

and transmitting the third information sequence.

With reference to the fifth aspect, in a first possible implementation manner of the fifth aspect, the protocol specifies n bits of the position, and includes: and the tail n bits of the second information sequence.

In a sixth aspect, an embodiment of the present invention provides a method for transmitting an identifier, where the method is applied to a wireless local area network WLAN, and the method includes:

coding the local identifier sequence to obtain a coding subsequence with n bits, wherein n is an integer larger than 0;

transforming the first information sequence to obtain a second information sequence, comprising: and placing the first subsequence at the tail part of the first information sequence, and replacing the first n bits of the first information sequence by the coding subsequence.

In a seventh aspect, an embodiment of the present invention provides a station for transmitting an identifier, where the station is applied to a wireless local area network WLAN, and the station includes:

the baseband chip is used for selecting partial bits of an identifier sequence of a first information sequence to be exclusive-ORed with a Cyclic Redundancy Code (CRC), wherein the identifier sequence is positioned at the head of the first information sequence;

the baseband chip is also used for carrying out zero-returning convolutional coding on the first information sequence after the exclusive or operation is carried out to obtain a second information sequence;

the baseband chip is further configured to select m bits of a protocol specified position in the second information sequence, compress the m bits of the protocol specified position into n bits, where n is an even number greater than 0, and m is greater than n;

the baseband chip is further configured to xor the compressed n bits with the first n bits of the second information sequence;

the baseband chip is further configured to delete m bits of the protocol specified position to obtain a third information sequence, where the third information sequence is located in an efficient signaling field HE-SIG of a physical layer protocol data unit PPDU;

and the radio frequency chip is used for sending the third information sequence.

With reference to the seventh aspect, in a first possible implementation manner of the seventh aspect, the selecting, by the baseband chip, m bits of a protocol specified position in the second information sequence, and compressing the m bits of the protocol specified position into n bits includes: and compressing 12 bits of the protocol-specified position in the second information sequence into 6 bits.

With reference to the first possible implementation manner of the seventh aspect, in a second possible implementation manner of the seventh aspect, the protocol specifies m bits of the position, and includes: and the tail m bits of the second information sequence.

In an eighth aspect, an embodiment of the present invention provides a station for transmitting an identifier, where the station is applied to a wireless local area network WLAN, and the station includes:

the radio frequency chip is used for receiving a first information sequence, and the first information sequence is positioned in an efficient signaling field HE-SIG of a physical layer protocol data unit PPDU;

the baseband chip is used for coding a first part of bits in the local identifier sequence to obtain a first coding subsequence of n bits, wherein the number of the first part of bits is n/2, and n is an even number greater than 0;

the baseband chip is further configured to perform soft xor processing on the first encoded subsequence and soft values of first n bits of the first information sequence to obtain a first subsequence, where the soft xor processing includes: soft values are reserved on the corresponding bits of the bits of '0' in the coding subsequence, and the soft values on the corresponding bits of the bits of '1' in the coding subsequence are inverted;

the baseband chip is also used for converting the first subsequence of the n bits to obtain a second subsequence of m bits, m is an integer larger than 0, and m is larger than n;

the baseband chip is further configured to transform the first information sequence to obtain a second information sequence, and includes: replacing the first coding subsequence with the first information sequence by n bits, and placing the second subsequence at the tail of the first information sequence;

the baseband chip is further configured to decode the second information sequence, and perform exclusive or on a second part of bits in the local identifier sequence and part of bits of the decoded second information sequence to obtain a CRC sequence;

the baseband chip is further configured to determine the decoded second information sequence, including: the CRC sequence is verified, and the first part of bits in the local identifier sequence is compared with the first n/2 bits of the decoded second information sequence.

In a ninth aspect, an embodiment of the present invention provides a station for transmitting an identifier, where the station is applied to a wireless local area network WLAN, and the station includes:

the baseband chip is further configured to select n bits of a protocol specified position in a second information sequence, and xor the n bits of the protocol specified position with the first n bits of the second information sequence, where n is an integer greater than 0;

the baseband chip is further configured to delete n bits of the protocol specified position to obtain a third information sequence, where the third information sequence is located in an efficient signaling field HE-SIG of a physical layer protocol data unit PPDU;

With reference to the ninth aspect, in a first possible implementation manner of the ninth aspect, the protocol specifies n bits of the position, and includes: and the tail n bits of the second information sequence.

In a tenth aspect, an embodiment of the present invention provides a station for transmitting an identifier, where the station is applied to a wireless local area network WLAN, and the station includes:

the baseband chip is used for coding a first part of bits in the local identifier sequence to obtain a coding subsequence with n bits, wherein the number of the first part of bits is n/2, and n is an even number greater than 0;

the baseband chip is further configured to perform soft xor processing on the encoded subsequence and soft values of first n bits of the first information sequence to obtain a first subsequence, where the soft xor processing includes: soft values are reserved on the corresponding bits of the bits of '0' in the coding subsequence, and the soft values on the corresponding bits of the bits of '1' in the coding subsequence are inverted;

the baseband chip is further configured to transform the first information sequence to obtain a second information sequence, and includes: placing the first subsequence at the tail of the first information sequence, and replacing the first n bits of the first information sequence by the coding subsequence;

In an eleventh aspect, an embodiment of the present invention provides a station for transmitting an identifier, where the station is applied to a wireless local area network WLAN, and the station includes:

the baseband chip is used for carrying out return-to-zero convolutional coding on a first information sequence to obtain a second information sequence, wherein an identifier sequence is positioned at the front part of the first information sequence;

the baseband chip is further configured to select n bits of a protocol specified position in the second information sequence, and xor the n bits of the protocol specified position with the first n bits of the second information sequence, where n is an integer greater than 0;

With reference to the eleventh aspect, in a first possible implementation manner of the eleventh aspect, the protocol specifies n bits of the position, and includes: and the tail n bits of the second information sequence.

In a twelfth aspect, an embodiment of the present invention provides a station for transmitting an identifier, where the station is applied to a wireless local area network WLAN, and the station includes:

the baseband chip is used for coding the local identifier sequence to obtain a coding subsequence with n bits, wherein n is an integer larger than 0;

the baseband chip is further configured to transform the first information sequence to obtain a second information sequence, and includes: and placing the first subsequence at the tail part of the first information sequence, and replacing the first n bits of the first information sequence by the coding subsequence.

In the process of transmitting the identifier by the wireless local area network, the sending unit carries out return-to-zero convolutional coding on the information sequence, wherein the identifier sequence is positioned at the front part of the information sequence. And the sending unit embeds the tail bits in the information sequence into the associated ID for transmission after compressing the tail bits, so that the overhead of the CRC sequence and the tail bits is reduced, the efficiency of sending the data stream is improved, and the performance is better compared with the performance of adopting tail-biting convolutional coding.

Drawings

Fig. 1 is a diagram of an application scenario of the present invention.

FIG. 2 is a flowchart of the method of example 1 of the present invention.

Fig. 3 is a structural diagram of a physical layer protocol data unit PPDU according to an embodiment of the present invention.

Fig. 4 is a processing block diagram 1 according to embodiment 1 of the present invention.

Fig. 5 is a processing block diagram 2 according to embodiment 1 of the present invention.

Fig. 6 is a processing block diagram 3 according to embodiment 1 of the present invention.

FIG. 7 is a flowchart of the method of embodiment 2 of the present invention.

Fig. 8 is a processing block diagram 1 according to embodiment 2 of the present invention.

Fig. 9 is a processing block diagram 2 according to embodiment 2 of the present invention.

Fig. 10 is a processing block diagram 3 according to embodiment 2 of the present invention.

FIG. 11 is a flowchart of a method according to embodiment 3 of the present invention.

FIG. 12 is a flowchart of the method of embodiment 4 of the present invention.

FIG. 13 is a flowchart of a method in accordance with embodiment 5 of the present invention.

FIG. 14 is a flowchart of a method according to embodiment 6 of the present invention.

Fig. 15 is a hardware configuration diagram of embodiments 7 to 12 of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention are described in further detail below with reference to the accompanying drawings. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the invention. It will be understood by those skilled in the art, however, that the present invention may be practiced without these specific details. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The embodiment of the invention can be applied to the WLAN, and the standard adopted by the WLAN is IEEE802.11 series at present. The WLAN may include a plurality of Basic Service Sets (BSS), where a network node in a BSS is a Station (STA), and the Station includes an Access Point (AP) and a Non-Access Point (Non-AP STA). Each basic service set may include one AP and a plurality of Non-AP STAs associated with the AP.

And the access point type station is also called as a wireless access point or a hot spot, and the like. The AP is an access point for a mobile subscriber to enter a wired network, and is mainly deployed in a home, a building, and a campus, and typically has a coverage radius of several tens of meters to hundreds of meters, and may be deployed outdoors. The AP acts as a bridge connecting the network and the wireless network, and mainly functions to connect the wireless network clients together and then to access the wireless network to the ethernet. Specifically, the AP may be a terminal device or a network device with a WiFi (Wireless Fidelity, chinese) chip. Optionally, the AP may be a device supporting 802.11ax standard, and further optionally, the AP may be a device supporting multiple WLAN standards such as 802.11ac, 802.11n, 802.11g, 802.11b, and 802.11 a.

A Non-Access Point (Non-AP STA) may be a wireless communication chip, a wireless sensor, or a wireless communication terminal. For example: the mobile phone supporting the WiFi communication function, the tablet computer supporting the WiFi communication function, the set top box supporting the WiFi communication function, the smart television supporting the WiFi communication function, the smart wearable device supporting the WiFi communication function, the vehicle-mounted communication device supporting the WiFi communication function and the computer supporting the WiFi communication function. Optionally, the station may support an 802.11ax system, and further optionally, the station supports multiple WLAN systems such as 802.11ac, 802.11n, 802.11g, 802.11b, and 802.11 a.

Fig. 1 is a system diagram of a typical WLAN deployment scenario, including an AP in communication with STA1, STA2, and STA3, and 3 STAs.

Example 1

Embodiment 1 of the present invention provides a method for transmitting an identifier in a WLAN, where the method may be applied to a station, for example: AP and STA1 in fig. 1-STA3, which may support next generation WLAN standards such as: 802.11ax format. Fig. 2 is a flowchart of the identifier transmission method, which includes the following specific steps:

a step 110 of selecting a partial bit of an identifier sequence of a first information sequence to be exclusive-or-ed with a Cyclic Redundancy Code (CRC), wherein the identifier sequence is located at the head of the first information sequence;

120, carrying out zero-returning convolutional coding on the first information sequence after the XOR operation is carried out to obtain a second information sequence;

step 130, selecting m bits of the protocol specified position in the second information sequence, compressing the m bits of the protocol specified position into n bits, wherein n is an even number greater than 0, and m is greater than n;

step 140, XOR the compressed n bits with the first n bits of the second information sequence;

and 150, deleting m bits of the specified position of the protocol to obtain a third information sequence, wherein the third information sequence is positioned in an efficient signaling field HE-SIG of a physical layer protocol data unit PPDU.

Step 160: and transmitting the third information sequence.

Optionally, the m bits of the protocol-specified location include: and the tail m bits of the second information sequence. The m bits may be partially located at the tail of the information sequence and partially located at the head of the information sequence, and the position of the m bits is not limited in the present invention.

It should be noted that, the first information sequence, the second information sequence and the third information sequence mentioned in step 110-150 all belong to signaling and are located in a Preamble portion of a PPDU of a next-generation WLAN, and preferably, the information sequences are located in a high-efficiency signaling field HE-SIG, as shown in fig. 3. The length of the information sequence is variable, and the length includes tens of bits to hundreds of bits, and the length of the information sequence is not limited by the invention. The description of the above information sequence is equally applicable to the subsequent embodiments.

The identifier sequence referred to in step 110 includes a variety of forms, for example: AID (English: Association identifier, Chinese), Partial AID, Pre-AID, BSSID (Basic Services SetIdentifier, Chinese: Basic service set identifier), or Partial BSSID.

Specifically, the AID is an identifier assigned by the AP to the associated station, and may be used for multi-user transmission (including multi-user transmission in the frequency domain and multi-user transmission in the spatial domain), and the AID has a length of 11 bits. Partial AIDs are length reduced versions of AIDs. The Pre-AID is a temporary identification assigned by the AP to the STA when the AP and the STAs are not fully associated. The BSSID is an identifier of a BSS in which the AP and the STA are located, and is generally a MAC address of the AP and has a length of 48 bits. The Partial BSSID is a reduced-length version of the BSSID. The description of the identifier sequence described above applies equally to the subsequent embodiments.

The return-to-zero convolutional coding mentioned in step 120 belongs to the channel coding scheme applied to the WLAN standard (e.g., ieee802.11 ac). The return-to-zero convolutional code requires that a 0 bit be added at the end of the information stream to force the state of the convolutional code to zero, thereby causing the trellis to start and end at the all-zero state.

The compression strategy for compressing m bits into n bits in step 130 specifically includes: if the m bits comprise tail bits of the second information sequence, bits of length m-n of the second information sequence starting from the second last bit are preferentially compressed. Any n bits of the m bits can be compressed if the m bits do not contain tail bits. Preferably, the m bits include tail bits, e.g., all of the m bits are tail bits.

The following explains steps 110 to 150 of the present embodiment with a specific example, where the identifier sequence is set to be an AID of 11 bits, the CRC sequence is 8 bits, and the first information sequence is 30 bits.

Step 1101: and calculating 8-bit CRC redundancy check codes according to the first information sequence, and performing XOR on the 8 last bits of the AID. The AID is located at the head of the first information sequence as shown in fig. 4.

Step 1201: after 6 all-zero tail bits (30 bits of information +6 bits of 0) are added to the first information sequence embedded with CRC, return-to-zero convolutional coding is performed to obtain a 72-bit second information sequence, as shown in fig. 5. Wherein, the first 6 bits of the second information sequence after convolution coding are non-embedded information. It should be noted that, in step 120, a return-to-zero convolutional code with a code rate of 1/2 is used.

Step 1301: and taking out 12 tail bits from the end of the coded second information sequence and compressing the 12 tail bits into 6 tail bits.

Specifically, the first information sequence is subjected to return-to-zero convolutional coding to obtain a second information sequence, where the second information sequence includes 12 tail bits, and the 12 tail bits have a certain characteristic. Characteristic 1: once the first 6 bits of the tail bits are determined, the last 6 bits are fixed, so that a tail bit codebook with 64 rows at most can be obtained. I.e. the tail bits have compressibility: after some bits of the tail bits are known, the tail bits can be completed by looking up the codebook. Characteristic 2: the last two bits (11 th, 12 th bits) of the tail bits must be identical.

Illustratively, the second information sequence produces 12 tail bits, as shown in table 1:

TABLE 1

According to the codebook characteristics of the tail bits, it is known that the first 5 and last 1 bits can restore all tail bits. The compression method used here is to remove the tail bits of 6 to 11 bits and to reserve the tail bits of 1 to 5 bits and 12 bits to obtain the compressed 6 bits, as shown in table 2.

TABLE 2

It should be understood that if 12 tail bits to n bits, n <12, are required to be compressed, bits n, n +1, …, 11 of the 12 tail bits may be removed, and

bits

1, 2, …, n-1 and 12 may be retained according to the above rules.

Step 1401: the compressed 6 tail bits are xored with the first 6 bits of the encoded second information sequence in step 120, as shown in fig. 6.

Step 1501: and removing the embedded tail bits obtained in the step 140 and the last 12 tail bits of the 72-bit second information sequence of the CRC to obtain a 60-bit third information sequence.

Example 2

Embodiment 2 of the present invention provides a method for transmitting an identifier in a WLAN, where the method may be applied to a station, for example: AP and STA1 in fig. 1-STA3, which may support next generation WLAN standards such as: 802.11ax format. Fig. 7 is a flowchart of the identifier transmission method, which includes the following specific steps:

step 210: receiving a first information sequence, wherein the first information sequence is located in an efficient signaling field (HE-SIG) of a physical layer protocol data unit (PPDU);

step 220: coding a first part of bits in the local identifier sequence to obtain a first coding subsequence of n bits, wherein the number of the first part of bits is n/2, and n is an even number greater than 0;

step 230: performing soft xor processing on the first encoded subsequence and soft values of first n bits of the first information sequence to obtain a first subsequence, wherein the soft xor processing comprises: soft values are reserved on the corresponding bits of the bits of '0' in the coding subsequence, and the soft values on the corresponding bits of the bits of '1' in the coding subsequence are inverted;

step 240: transforming the first subsequence of n bits to obtain a second subsequence of m bits, wherein m is an integer greater than 0, and m is greater than n;

step 250: transforming the first information sequence to obtain a second information sequence, comprising: replacing the first coding subsequence with the first information sequence by n bits, and placing the second subsequence at the tail of the first information sequence;

step 260: decoding the second information sequence, and performing XOR on a second part of bits in the local identifier sequence and part of bits of the decoded second information sequence to obtain a CRC sequence;

step 270: determining the decoded second information sequence, comprising: the CRC sequence is verified, and the first part of bits in the local identifier sequence is compared with the first n/2 bits of the decoded second information sequence.

It should be noted that the local identifier sequence mentioned in step 220 is stored by the site itself. The local identifier sequence includes a variety of forms, for example: AID (English: Association Identifier, Chinese: Association Identifier), Partial AID, Pre-AID, BSSID (Basic Services Set Identifier, Chinese: Basic service Set Identifier, English) or Partial BSSID. The local identifier sequence is divided into two parts, a first part of bits for the operation of step 220 and a second part of bits for the operation of step 260.

The soft values of the first n bits of the first information sequence mentioned in step 230 are real numbers, rather than discrete "0" or "1".

The first subsequence of n bits mentioned in step 240 is transformed to obtain a second subsequence of m bits, the operation of transformation belonging to decompression, recovering the sequence of m bits from the known sequence of n bits.

The following explains steps 210 to 270 of the present embodiment with a specific example, where the identifier sequence is set to be an AID of 11 bits, the CRC sequence is 8 bits, and the first information sequence is 60 bits.

Step 2201: and encoding the first 3 bits of the local AID without tail convolution to obtain a first encoding subsequence of 6 bits.

Step 2301: and carrying out soft XOR processing on soft values of the first 6 bits of the first information sequence received by the first 6-bit coding subsequence to obtain a first subsequence with the length of 6 bits. Specific soft xor rules: soft values are reserved on the corresponding bits of the "0" bits in the first encoded subsequence and the soft values on the corresponding bits of the "1" bits in the first encoded subsequence are inverted. Step 230 is shown in detail in FIG. 8.

Step 2401: the first subsequence of 6 bits is reduced to a second subsequence of 12 bits.

The reduction method has two modes: a. and reserving the first 5 bits, copying the 6 th bit to the restored 11 and 12 bits, and filling 0 in the restored 6-10 bits. b. The received 6 bits are firstly judged and restored into 6 binary bits, then the codebook is looked up, and the 6 bits compressed before are restored by the codebook.

The reduced 12 bits (reduction mode a) are shown in table 3.

TABLE 3

The reduced 12 bits (reduction b) are shown in table 4.

TABLE 4

Step 2501: transforming the first information sequence to obtain a second information sequence, which specifically comprises: the 12-bit second sub-sequence is placed at the end of the first information sequence of 60 bits in length, and the first encoded sub-sequence replaces the first information sequence of the first 6 bits. After the processing of step 250, a second information sequence of 72 bits is obtained. Step 250 is specifically illustrated in fig. 9.

Step 2601: and inputting the 72-bit second information sequence into a Viterbi decoder to obtain 36-bit information bits, and removing the last 6 bits of the 36-bit information bits to obtain 30-bit information bits embedded with CRC. And (4) carrying out exclusive OR on partial bits in the 30-bit information bits by using second partial bits (4-11 bits) of the local identifier sequence, and taking out the 8-bit CRC. Step 260 is specifically illustrated in FIG. 10.

Step 2701: and performing CRC verification on the 30 information bits, if the CRC verification is passed and the first 3 bits of the 30 information sequence are the same as the first 3 bits of the local identification sequence AID, determining that the 30 information bits transmitted at this time are transmitted correctly, otherwise, discarding the 30 information bits.

In the process of transmitting the identifier by the wireless local area network, the receiving unit performs zero-returning convolutional coding on the local identifier sequence and then performs soft exclusive-or operation on the local identifier sequence and the received information sequence to obtain the identifier sequence and the CRC sequence.

Example 3

Embodiment 3 of the present invention provides a method for transmitting an identifier in a WLAN, where the method may be applied to a station, for example: AP and STA1 in fig. 1-STA3, which may support next generation WLAN standards such as: 802.11ax format. Fig. 11 is a flowchart of the identifier transmission method, which includes the following specific steps:

step 310: selecting a partial bit of an identifier sequence of a first information sequence to be exclusive-ORed with a Cyclic Redundancy Code (CRC), wherein the identifier sequence is located at the head of the first information sequence;

step 320: carrying out return-to-zero convolutional coding on the first information sequence subjected to the exclusive or operation to obtain a second information sequence;

step 330: selecting n bits of a protocol specified position in a second information sequence, and carrying out exclusive OR on the n bits of the protocol specified position and the first n bits of the second information sequence, wherein n is an integer greater than 0;

step 340: and deleting n bits of the specified position of the protocol to obtain a third information sequence, wherein the third information sequence is positioned in an efficient signaling field HE-SIG of a physical layer protocol data unit PPDU.

Step 350: and transmitting the third information sequence.

Optionally, the n bits of the protocol-specified location include: and the tail n bits of the second information sequence.

Embodiment 3 is different from embodiment 1 in that only partial bits of 8-bit CRC are xored with partial bits of AID, and no operation of bit compression is performed.

The following explains steps 310 to 340 of the present embodiment with a specific example, where the identifier sequence is set to be an AID of 11 bits, the CRC sequence is 8 bits, and the first information sequence is 30 bits.

Step 3101: and calculating an 8-bit CRC redundancy check code according to the first information sequence, carrying out exclusive OR on the first 5 bits of the 8-bit CRC and the last 5 bits (7-11 bits) of the AID, and placing the last 3 bits of the CRC at the tail of the first information sequence. The AID is located at the head of the first information sequence.

Step 3201: and adding 6 all-zero tail bits (33 information bits +6 bits 0) to the first information sequence embedded with the CRC, and performing return-to-zero convolutional coding to obtain a 78-bit second information sequence.

Step 3301: the 12 bits in the protocol specified position in the second information sequence are selected to be exclusive-or' ed with the first 12 bits of the second information sequence. It should be noted that, in step 330, before the xor operation is performed, the first 12 bits of the second information sequence have no embedded information. Preferably, the 12-bit bits of the protocol-specified position are located at the end of the second information sequence.

Step 3401: 12 bits of the protocol-specified position in the 78-bit second information sequence are removed to obtain a 66-bit third information sequence.

Next, steps 310 to 340 of the present embodiment will be explained by taking another example, where the identifier sequence is set to be an AID of 11 bits, the CRC sequence is set to be 4 bits, and the first information sequence is set to be 30 bits.

Step 3102: a 4-bit CRC redundancy check code is calculated from the first information sequence and the 4-bit CRC code is xored with the last 4 bits of the AID (8-11 bits of the 30-bit first information sequence). The AID is located at the head of the first information sequence.

Step 3202: and adding 6 all-zero tail bits (30 information bits +6 bits 0) to the first information sequence embedded with the CRC, and performing return-to-zero convolutional coding to obtain a 72-bit second information sequence.

Step 3302: the first 14 bits of the second information sequence are selected to be exclusive-or' ed with the first 14 bits of the second information sequence. It should be noted that, in step 330, before the xor operation is performed, the first 14 bits of the second information sequence have no embedded information. Preferably, the 14 bits of the protocol specified position may be 12 tail bits of the second information sequence plus 2 bits of any position.

Step 3402: and removing 14 bits of the protocol specified position in the 72-bit second information sequence to obtain a 58-bit third information sequence.

In the process of transmitting the identifier by the wireless local area network, the sending unit carries out return-to-zero convolutional coding on the information sequence, wherein the identifier sequence is positioned at the front part of the information sequence. And the sending unit embeds the tail bits in the information sequence into the associated ID for transmission, thereby reducing the expenditure of the CRC sequence and the tail bits, improving the efficiency of sending the data stream and having better performance compared with the adoption of tail-biting convolutional coding.

Example 4

Embodiment 4 of the present invention provides a method for transmitting an identifier in a WLAN, where the method may be applied to a station, for example: AP and STA1 in fig. 12-STA 3, the station may support next generation WLAN standards such as: 802.11ax format. Fig. 12 is a flowchart of the identifier transmission method, which includes the following specific steps:

step 410: receiving a first information sequence, wherein the first information sequence is located in an efficient signaling field (HE-SIG) of a physical layer protocol data unit (PPDU);

step 420: coding a first part of bits in the local identifier sequence to obtain a coding subsequence with n bits, wherein the number of the first part of bits is n/2, and n is an even number greater than 0;

step 430: performing soft xor processing on the encoded subsequence and soft values of first n bits of the first information sequence to obtain a first subsequence, wherein the soft xor processing comprises: soft values are reserved on the corresponding bits of the bits of '0' in the coding subsequence, and the soft values on the corresponding bits of the bits of '1' in the coding subsequence are inverted;

step 440: transforming the first information sequence to obtain a second information sequence, comprising: placing the first subsequence at the tail of the first information sequence, and replacing the first n bits of the first information sequence by the coding subsequence;

step 450: decoding the second information sequence, and performing XOR on a second part of bits in the local identifier sequence and part of bits of the decoded second information sequence to obtain a CRC sequence;

step 460: determining the decoded second information sequence, comprising: the CRC sequence is verified, and the first part of bits in the local identifier sequence is compared with the first n/2 bits of the decoded second information sequence.

The following explains step 410 to step 460 of this embodiment with a specific example, where the identifier sequence is set to be an AID of 11 bits, the CRC sequence is 8 bits, and the first information sequence is 66 bits.

Step 4201: and carrying out zero-returning convolutional coding on the first 6 bits of the AID of the local identifier sequence to obtain a 12-bit coding subsequence.

Step 4301: and carrying out soft XOR processing on the 12-bit coding subsequence and the first 12 bits of the first information sequence to obtain a 12-bit first subsequence. The rule of the soft exclusive-or process is to reserve a soft value for the corresponding bit of the "0" bit in the first information sequence and to invert the soft value for the corresponding bit of the "1" bit in the first information sequence.

Step 4401: the step of transforming the first information sequence into the second information sequence comprises the following steps: and placing the 12-bit first subsequence at the tail of the 66-bit received first information sequence, replacing the head 12-bit value of the first information sequence with the 12-bit coding subsequence obtained by local zero-returning convolutional coding, and converting the 66-bit first information sequence to a 78-bit second information sequence after finishing conversion.

Step 4501: the second information sequence of 78 bits is input to a Viterbi decoder to obtain 39 information bits. The last 6 tail bits of the 39 information bits are removed to obtain 33 information bits with embedded CRC. And performing exclusive OR operation on the last five bits (7-11 bits) of the local identifier sequence AID and 7-11 bits of the 33-bit information bits of the embedded CRC to obtain a 5-bit CRC sequence, and combining the 5-bit CRC sequence with the last 3 bits of the 33-bit information bits of the embedded CRC to obtain an 8-bit CRC.

Step 4601: determining whether the 33-bit information bits are transmitted correctly, comprising: and if the CRC passes the verification and the first 6 bits of the 33-bit information sequence are the same as the first 6 bits of the AID of the local user, the transmission is considered to be correct, otherwise, the transmission is discarded.

Next, steps 410 to 460 of the present embodiment are explained by using another example, where the identifier sequence is set to be an AID of 11 bits, the CRC sequence is set to be 4 bits, and the first information sequence is set to be 58 bits.

Step 4202: and carrying out zero-returning convolutional coding on the first 7 bits of the local identifier sequence AID to obtain a 14-bit coding subsequence.

Step 4302: and carrying out soft XOR processing on the 14-bit coding subsequence and the first 14 bits of the first information sequence to obtain a 14-bit first subsequence. The rule of the soft exclusive-or process is to reserve a soft value for the corresponding bit of the "0" bit in the first information sequence and to invert the soft value for the corresponding bit of the "1" bit in the first information sequence.

Step 4402: the step of transforming the first information sequence into the second information sequence comprises the following steps: and placing the 14-bit first subsequence at the tail of the 58-bit received first information sequence, replacing the 14-bit coding subsequence obtained by local zero-returning convolutional coding with the first 14-bit value of the first information sequence, and converting the 58-bit first information sequence to a 72-bit second information sequence after finishing conversion.

Step 4502: the second information sequence of 72 bits is input to a Viterbi decoder to obtain 36 bits of information. The last 6 tail bits of the 36 information bits are removed to obtain 30 information bits embedded with CRC. And performing exclusive OR operation on the last four bits (8-11 bits) of the local identifier sequence AID and 8-11 bits of the 30-bit information bits embedded with the CRC to obtain a 4-bit CRC sequence.

Step 4602: determining whether the 30-bit information bits are transmitted correctly, comprising: and if the CRC passes the verification and the first 7 bits of the 30-bit information sequence are the same as the first 7 bits of the local user AID, the transmission is considered to be correct, otherwise, the transmission is discarded.

Example 5

Embodiment 5 of the present invention provides a method for transmitting an identifier in a WLAN, where the method may be applied to a station, for example: AP and STA1 in fig. 1-STA3, which may support next generation WLAN standards such as: 802.11ax format. Fig. 13 is a flowchart of the identifier transmission method, which includes the following specific steps:

step 510: carrying out zero-returning convolution coding on a first information sequence to obtain a second information sequence, wherein an identifier sequence is positioned at the front part of the first information sequence;

step 520: selecting n bits of a protocol specified position in a second information sequence, and carrying out exclusive OR on the n bits of the protocol specified position and the first n bits of the second information sequence, wherein n is an integer greater than 0;

step 530: and deleting n bits of the specified position of the protocol to obtain a third information sequence, wherein the third information sequence is positioned in an efficient signaling field HE-SIG of a physical layer protocol data unit PPDU.

Step 540: and transmitting the third information sequence.

It should be noted that the identifier sequence mentioned in step 510 includes various forms, such as: AID (English: Association Identifier, Chinese: Association Identifier), Partial AID, Pre-AID, BSSID (BSSID, English: basic services Set Identifier, Chinese: basic service Set Identifier) or Partial BSSID. Preferably, this embodiment employs an AID of 11 bits.

Embodiment 5 differs from embodiment 3 and embodiment 1 in that CRC redundancy check codes are not embedded at all. Then 11 bits of the AID that is not convolutionally encoded at the transmitting end are fully available, and after the 11-bit AID is convolutionally encoded, 22 available embedded bits are generated, and 22 bits of the protocol-specified position of the second information sequence are fully embedded in the first 22 bits of the second information sequence. Preferably, the 22 bits of the protocol specified position can be 12 tail bits at the end of the coded sequence plus 10 bits of any position.

The following explains steps 510 to 530 of the present embodiment with a specific example, where the identifier sequence is set to be an AID of 11 bits and the first information sequence is 36 bits.

Step 5101: the first information sequence of 36 bits (30 information bits +6 bits 0) is subjected to return-to-zero convolutional coding to obtain a second information sequence of 72 bits.

Step 5201: the first 22 bits of the second information sequence are AIDs, and the 22 bits of data are all non-embedded information. Performing exclusive or processing on the last 22 bits (including 12 tail bits) of the convolution-coded 72-bit user data and the first 22 bits in the second information sequence, namely: the 51 st bit of the convolutionally encoded data stream is xored to the 1 st bit, the 52 nd bit is xored to the 2 nd bit … … the 72 nd bit is xored to the 22 nd bit.

Step 5301: and removing the tail bits of the last 22 bits of the 72-bit second information sequence to obtain a 50-bit third information sequence for transmission.

In the process of transmitting the identifier by the wireless local area network, the sending unit carries out return-to-zero convolutional coding on the information sequence, wherein the identifier sequence is positioned at the front part of the information sequence. And the sending unit embeds the tail bits in the information sequence into the associated ID for transmission, so that the overhead of the tail bits is reduced, the efficiency of sending the data stream is improved, and the performance is better compared with the performance of adopting tail-biting convolutional coding.

Example 6

Embodiment 6 of the present invention provides a method for transmitting an identifier in a WLAN, where the method may be applied to a station, for example: AP and STA1 in fig. 1-STA3, which may support next generation WLAN standards such as: 802.11ax format. Fig. 14 is a flowchart of the identifier transmission method, which includes the following specific steps:

step 610: receiving a first information sequence, wherein the first information sequence is located in an efficient signaling field (HE-SIG) of a physical layer protocol data unit (PPDU);

step 620: coding the local identifier sequence to obtain a coding subsequence with n bits, wherein n is an integer larger than 0;

step 630: performing soft xor processing on the encoded subsequence and soft values of first n bits of the first information sequence to obtain a first subsequence, wherein the soft xor processing comprises: soft values are reserved on the corresponding bits of the bits of '0' in the coding subsequence, and the soft values on the corresponding bits of the bits of '1' in the coding subsequence are inverted;

step 640: transforming the first information sequence to obtain a second information sequence, comprising: and placing the first subsequence at the tail part of the first information sequence, and replacing the first n bits of the first information sequence by the coding subsequence.

The following explains steps 610 to 640 of the present embodiment with a specific example, where the identifier sequence is set to be an AID of 11 bits and the first information sequence is 50 bits.

Step 6201: and carrying out zero-returning convolution coding on the local identifier sequence (11-bit AID) to obtain a 22-bit coded subsequence.

Step 6301: and carrying out soft XOR processing on the 22-bit coding subsequence and the first 22 bits of the first information sequence to obtain a 22-bit first subsequence.

Step 6401: converting the 50-bit first information sequence to obtain a 72-bit second information sequence, specifically: and placing the 22-bit first subsequence at the tail of the 50-bit first information sequence, and replacing the AID value of the 22-bit coded subsequence with the 22 bits at the head of the received first information sequence.

After step 6401, the receiver may further input the 72-bit second information sequence stream into a Viterbi decoder to obtain 36-bit information bits, and remove the last 6 tail bits of the 36-bit information bits to obtain the recovered 30-bit information bits.

In the process of transmitting the identifier by the wireless local area network, the receiving unit performs the soft exclusive-or operation on the received information sequence after performing the zero-returning convolutional coding on the local identifier sequence to obtain the identifier sequence.

Example 7

Fig. 15 is a schematic block diagram of a station that transmits an identifier in a wireless local area network according to embodiment 7 of the present invention. The site 1500 includes a processor 1510, a memory chip 1520, a baseband chip 1530, a radio frequency chip 1540, and an antenna 1550.

Processor 1510 controls the operation of station 1500. The memory 1520 may include read-only memory and random-access memory and provides instructions and data to the processor 1510, which may be a general-purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array, or other programmable logic device. A portion of the memory 1520 may also include non-volatile row random access memory (NVRAM). The baseband chip 1530 is used to synthesize a baseband signal to be transmitted or decode a received baseband signal. The rf chip 1540 is configured to modulate the low-frequency baseband signal into a high-frequency carrier signal, and the high-frequency carrier signal is transmitted through the antenna 1550. The rf chip is also used to demodulate the high frequency signal received by the antenna 1550 into a low frequency carrier signal. The various components of station 1500 are coupled together by a bus 1560, where bus system 1560 includes a power bus, a control bus, and a status signal bus in addition to a data bus. For clarity of illustration, however, the various buses are designated in the figure as bus system 1560. It should be noted that the above description of the station structure can be applied to the following embodiments.

Station 1500 may be the AP or STA1-STA3 shown in fig. 1. The station in embodiment 7 plays the role of a transmitter.

A baseband chip 1530 for selecting a partial bit of an identifier sequence of a first information sequence to be exclusive-ored with a cyclic redundancy code CRC, wherein the identifier sequence is located at a head of the first information sequence;

the baseband chip 1530 is further configured to perform zero-returning convolutional coding on the first information sequence after performing the exclusive or operation to obtain a second information sequence;

the baseband chip 1530 is further configured to select m bits of a protocol specified position in the second information sequence, compress the m bits of the protocol specified position into n bits, where n is an even number greater than 0, and m is greater than n;

the baseband chip 1530 is further configured to xor the compressed n bits with the first n bits of the second information sequence;

the baseband chip 1530 is further configured to delete the m bits at the specified position of the protocol to obtain a third information sequence, where the third information sequence is located in an efficient signaling field HE-SIG of a PPDU (physical layer protocol data unit);

and the rf chip 1540 is configured to send the third information sequence.

Optionally, the baseband chip selects m bits of a protocol specified position in the second information sequence, and compresses the m bits of the protocol specified position into n bits, including: and compressing 12 bits of the protocol-specified position in the second information sequence into 6 bits.

Optionally, the m bits of the protocol-specified location include: and the tail m bits of the second information sequence.

In the process of transmitting the identifier by the wireless local area network, the baseband chip carries out return-to-zero convolutional coding on the information sequence, wherein the identifier sequence is positioned at the front part of the information sequence. And the baseband chip compresses the tail bits in the information sequence and embeds the tail bits into the associated ID for transmission, so that the overhead of the CRC sequence and the tail bits is reduced, the efficiency of transmitting the data stream is improved, and the performance is better compared with the performance of tail-biting convolutional coding.

Example 8

The station in embodiment 8 includes a processor, a memory chip, a baseband chip, a radio frequency chip, and an antenna. The station may be the AP shown in fig. 1 or STA1-STA 3. The station in embodiment 8 plays the role of a receiver.

In the process of transmitting the identifier by the wireless local area network, the baseband chip performs zero-returning convolutional coding on the local identifier sequence and then performs soft exclusive-or operation on the local identifier sequence and the received information sequence to obtain the identifier sequence and the CRC sequence.

Example 9

The station in embodiment 9 includes a processor, a memory chip, a baseband chip, a radio frequency chip, and an antenna. The station may be the AP shown in fig. 1 or STA1-STA 3. The station in embodiment 9 plays the role of a transmitter.

In the process of transmitting the identifier by the wireless local area network, the baseband chip carries out return-to-zero convolutional coding on the information sequence, wherein the identifier sequence is positioned at the front part of the information sequence. And the baseband chip embeds the tail bits in the information sequence into the associated ID for transmission, thereby reducing the expenditure of the CRC sequence and the tail bits, improving the efficiency of sending the data stream, and having better performance compared with the adoption of tail-biting convolutional coding.

Example 10

The station in embodiment 10 includes a processor, a memory chip, a baseband chip, a radio frequency chip, and an antenna. The station may be the AP shown in fig. 1 or STA1-STA 3. The station in embodiment 10 plays the role of a receiver.

Example 11

The station in embodiment 11 includes a processor, a memory chip, a baseband chip, a radio frequency chip, and an antenna. The station may be the AP shown in fig. 1 or STA1-STA 3. The station in embodiment 11 plays the role of a transmitter.

In the process of transmitting the identifier by the wireless local area network, the baseband chip carries out return-to-zero convolutional coding on the information sequence, wherein the identifier sequence is positioned at the front part of the information sequence. And the baseband chip embeds the tail bits in the information sequence into the associated ID for transmission, so that the overhead of the tail bits is reduced, the efficiency of transmitting the data stream is improved, and the performance is better compared with the performance of tail-biting convolutional coding.

Example 12

The station in embodiment 12 includes a processor, a memory chip, a baseband chip, a radio frequency chip, and an antenna. The station may be the AP shown in fig. 1 or STA1-STA 3. The station in embodiment 12 plays the role of a receiver.

In the process of transmitting the identifier by the wireless local area network, the baseband chip performs the soft exclusive-or operation on the received information sequence after performing the zero-returning convolutional coding on the local identifier sequence to obtain the identifier sequence.

The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for transmitting an identifier, which is applied to a Wireless Local Area Network (WLAN), is characterized by comprising the following steps:

and transmitting the third information sequence.

2. The method of claim 1, wherein the selecting m bits of protocol-specific positions in the second information sequence and compressing the m bits of protocol-specific positions into n bits comprises: and compressing 12 bits of the protocol-specified position in the second information sequence into 6 bits.

3. The method of claim 2, wherein the protocol specifies m bits of the location, comprising: and the tail m bits of the second information sequence.

4. A method for transmitting an identifier, which is applied to a Wireless Local Area Network (WLAN), is characterized by comprising the following steps:

5. A method for transmitting an identifier, which is applied to a Wireless Local Area Network (WLAN), is characterized by comprising the following steps:

and transmitting the third information sequence.

6. The method of claim 5, wherein the protocol specifies n bits of the location, comprising: and the tail n bits of the second information sequence.

7. A method for transmitting an identifier, which is applied to a Wireless Local Area Network (WLAN), is characterized by comprising the following steps:

8. A method for transmitting an identifier, which is applied to a Wireless Local Area Network (WLAN), is characterized by comprising the following steps:

and transmitting the third information sequence.

9. The method of claim 8, wherein the protocol specifies n bits of the location, comprising: and the tail n bits of the second information sequence.

10. A method for transmitting an identifier, which is applied to a Wireless Local Area Network (WLAN), is characterized by comprising the following steps:

11. A station for transmitting an identifier, the station being applied to a wireless local area network WLAN, the station comprising:

12. The station of claim 11, wherein the baseband chip selects m bits of a protocol specified position in the second information sequence, and compresses the m bits of the protocol specified position into n bits, comprising: and compressing 12 bits of the protocol-specified position in the second information sequence into 6 bits.

13. The station of claim 12, wherein the protocol specifies m bits of the location, comprising: and the tail m bits of the second information sequence.

14. A station for transmitting an identifier, the station being applied to a wireless local area network WLAN, the station comprising:

15. A station for transmitting an identifier, the station being applied to a wireless local area network WLAN, the station comprising:

16. The station of claim 15, wherein the protocol specifies n bits of the location, comprising: and the tail n bits of the second information sequence.

17. A station for transmitting an identifier, the station being applied to a wireless local area network WLAN, the station comprising:

18. A station for transmitting an identifier, the station being applied to a wireless local area network WLAN, the station comprising:

19. The station of claim 18, wherein the protocol specifies n bits of the location, comprising: and the tail n bits of the second information sequence.

20. A station for transmitting an identifier, the station being applied to a wireless local area network WLAN, the station comprising: