CN107155401B

CN107155401B - Transmission method and transmission device for data packets in wireless local area network

Info

Publication number: CN107155401B
Application number: CN201580058813.9A
Authority: CN
Inventors: 于健; 禄彼得; 刘晟; 林梅露
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2014-12-25
Filing date: 2015-01-14
Publication date: 2020-04-28
Anticipated expiration: 2035-01-14
Also published as: WO2016101364A1; CN107155401A

Abstract

The invention provides a data packet transmission method applied to a Wireless Local Area Network (WLAN), which comprises the following steps: the sending station generates a data packet, the data packet comprises a preamble field and a data field, the preamble field comprises a traditional signaling field and an efficient signaling field, a Length field in the traditional signaling field carries a second indication value, the second indication value is obtained by processing a first indication value by the sending station, the first indication value is used for indicating the sending time Length of the data packet, the second indication value is an even number and is not a multiple of 3, the sending station sends the data packet, and the data packet carries the second indication value. The embodiment of the invention also provides a corresponding data packet transmission device, and by applying the method and the device of the embodiment of the invention, the length of the data packet is reduced, the overhead is reduced, and the robustness of the check in the traditional signaling field is improved.

Description

Transmission method and transmission device for data packets in wireless local area network

The present application claims priority from PCT patent application with application number PCT/CN2014/094999, entitled "transmission method and transmission apparatus for data packets in wireless local area network" filed by the chinese patent office on 25/12/2014, which is incorporated herein by reference in its entirety.

Technical Field

The present invention belongs to the field of communication technology, and in particular, to a transmission method and a transmission device for data packets in a wireless local area network.

Background

It is well known that signals transmitted in a wireless channel are prone to errors. Therefore, while the information bits are transmitted, check bits are also transmitted for error checking, wherein the number of check bits is one bit or a plurality of bits.

In the existing Wireless Local Area Network (WLAN) standard, there are different generations of standards, including 802.11 a/b/g/n/ac. Data packets based on these standards comprise a signalling field and a data field, in which different check bits are present. The parity bits play an important role in the existing WLAN standard of 802.11 a/b/g/n/ac. The checking function is performed in both the signaling field and the data field.

Next generation WLAN standards (e.g. 802.11ax) mainly consider high-density access scenarios and low-speed outdoor scenarios, so that data packets are often transmitted in low signal-to-interference-and-noise ratio environments, which is prone to transmission errors. However, the conventional signaling field only has 1-bit parity bit, so the probability of misjudgment is high, specifically, the conventional signaling field is wrong, but the result of displaying the parity bit is correct transmission. Therefore, the robustness of the check bits of the conventional signaling field is too low to provide an effective check capability.

Disclosure of Invention

In view of this, the present invention provides a method and a device for transmitting data packets in a wireless local area network, so as to solve the problem that the checking capability of the conventional signaling field in the wireless local area network is not robust enough.

In a first aspect, an embodiment of the present invention provides a data packet transmission method applied to a wireless local area network WLAN, where the method includes:

a sending station generates a data packet, wherein the data packet comprises a preamble field and a data field, the preamble field comprises a traditional signaling field and an efficient signaling field, a Length field in the traditional signaling field carries a second indication value, the second indication value is obtained by processing a first indication value by the sending station, the first indication value is used for indicating the sending time Length of the data packet, and the second indication value is an even number and is not a multiple of 3;

and the sending station sends the data packet, and the data packet carries the second indication value.

With reference to the first aspect, in a first implementation manner of the first aspect, the preamble field further includes a first cyclic redundancy check field, where the first cyclic redundancy check field is obtained by performing a cyclic redundancy check operation on a partial field in the legacy signaling field by the sending station, and the partial field in the legacy signaling field includes any one or any combination of the following fields: rate field, reserved bits, Length field.

With reference to the first implementation manner of the first aspect, in a second implementation manner of the first aspect, the first cyclic redundancy check field is located in a reserved bit of the legacy signaling field.

With reference to the first implementation manner of the first aspect, in a third implementation manner of the first aspect, the preamble field further includes a second cyclic redundancy check field, the first cyclic redundancy check field is located in the high-efficiency signaling field, and the second cyclic redundancy check field is generated by performing a cyclic redundancy check on fields, except for the first cyclic redundancy check field, in the high-efficiency signaling field by the sending station.

With reference to the first implementation manner of the first aspect, in a fourth implementation manner of the first aspect, the preamble field further includes a second cyclic redundancy check field, where the second cyclic redundancy check field is obtained by performing a cyclic redundancy check operation on the first cyclic redundancy check field and other fields of the high-efficiency signaling field by the sending station, and the first cyclic redundancy check field is located in the high-efficiency signaling field.

With reference to the third implementation manner or the fourth implementation manner of the first aspect, in a fifth implementation manner of the first aspect, when the high-efficiency signaling field has multiple symbols and is coded independently, the first cyclic redundancy check field is located in a first symbol of the high-efficiency signaling field.

With reference to the first aspect, in a sixth implementation manner of the first aspect, the preamble field further includes a third cyclic redundancy check field, where the third cyclic redundancy check field is obtained by performing a cyclic redundancy check on a partial field in the legacy signaling field and the efficient signaling field by the sending station, and the partial field in the legacy signaling field includes any one or any combination of the following fields: rate field, reserved bits, Length field.

With reference to the first aspect and the foregoing implementation manner, in a seventh implementation manner of the first aspect, the first indication value is located in a Length field of the conventional signaling field, the first indication value is obtained by the sending station through calculation according to a packet structure of 802.11a and a lowest data transmission rate, and the first indication value is a multiple of 3.

With reference to the first aspect and the foregoing implementation manner, in an eighth implementation manner of the first aspect, the second indication value carried by the Length field is an even number, and specifically, a lowest bit of the Length field is 0.

With reference to the first aspect and the foregoing implementation manner of the first aspect, in a ninth implementation manner of the first aspect, the legacy signaling field further includes a parity bit.

In a second aspect, an embodiment of the present invention provides a data packet transmission method applied to a wireless local area network WLAN, where the method includes:

a sending station generates a data packet, where the data packet includes a preamble field and a data field, the preamble field includes a legacy signaling field and an efficient signaling field, a first cyclic redundancy check field is located in the preamble field, the first cyclic redundancy check field is obtained by the sending station performing a cyclic redundancy check operation on a part of fields in the legacy signaling field, and the part of fields in the legacy signaling field includes any one or any combination of the following: rate field, reserved bit, Length field;

and the sending station sends the data packet, and the data packet carries the first cyclic redundancy check field.

With reference to the second aspect, in a first implementation manner of the second aspect, the first cyclic redundancy check field is located in a reserved bit of the legacy signaling field.

With reference to the second aspect, in a second implementation manner of the second aspect, the preamble field further includes a second cyclic redundancy check field, the first cyclic redundancy check field is located in the efficient signaling field, and the second cyclic redundancy check field is generated by the sending station performing a cyclic redundancy check on fields, except for the first cyclic redundancy check field, in the efficient signaling field.

With reference to the second aspect, in a third implementation manner of the second aspect, the preamble field further includes a second cyclic redundancy check field, the first cyclic redundancy check field is located in the high-efficiency signaling field, and the second cyclic redundancy check field is obtained by performing a cyclic redundancy check operation on the first cyclic redundancy check field and other fields of the high-efficiency signaling field by the sending station.

With reference to the second implementation manner or the third implementation manner of the second aspect, in a fourth implementation manner of the second aspect, when multiple symbols exist in the high-efficiency signaling field and are independently encoded, the first cyclic redundancy check field is located in a first symbol of the high-efficiency signaling field.

In a third aspect, an embodiment of the present invention provides a data packet transmission method applied to a wireless local area network WLAN, where the method includes:

a receiving station receives a data packet, wherein the data packet comprises a preamble field and a data field, the preamble field comprises a traditional signaling field and an efficient signaling field, a Length field in the traditional signaling field carries a second indication value, the second indication value is obtained by processing a first indication value by a sending station, and the first indication value is used for indicating the sending time Length of the data packet;

the receiving station parsing the data packet, including: if the receiving station determines that the second indication value is an even number and not a multiple of 3, the receiving station determines that the conventional signaling field is correctly transmitted, and the receiving station processes the second indication value to obtain the first indication value.

With reference to the third aspect, in a first implementation manner of the third aspect, the parsing, by the receiving station, the data packet further includes:

if the second indication value is even and not a multiple of 3 and the receiving station detects a correct first cyclic redundancy check field in the preamble field, the receiving station determines that the legacy signaling field is correctly transmitted,

the first cyclic redundancy check field is obtained by the sending station performing cyclic redundancy check operation on a part of fields in the legacy signaling field, where the part of fields in the legacy signaling field includes any one or any combination of the following: rate field, reserved bits, Length field.

With reference to the first implementation manner of the third aspect, in a second implementation manner of the third aspect, the first cyclic redundancy check field is located in a reserved bit of the legacy signaling field, and if the receiving station detects the first cyclic redundancy check field correctly, the receiving station determines that the legacy signaling field is correctly transmitted.

With reference to the first implementation manner of the third aspect, in a third implementation manner of the third aspect, the preamble field further includes a second cyclic redundancy check field, the first cyclic redundancy check field is located in the high-efficiency signaling field, and the second cyclic redundancy check field is obtained by performing a cyclic redundancy check operation on fields, except for the first cyclic redundancy check field, in the high-efficiency signaling field by the sending station,

and if the receiving station detects the first cyclic redundancy check field correctly, the receiving station determines that the traditional signaling field is sent correctly.

With reference to the first implementation manner of the third aspect, in a fourth implementation manner of the third aspect, the preamble field further includes a second cyclic redundancy check field, the first cyclic redundancy check field is located in the high-efficiency signaling field, and the second cyclic redundancy check field is obtained by performing a cyclic redundancy check operation on the first cyclic redundancy check field and other fields of the high-efficiency signaling field by the sending station,

if the receiving station detects the first cyclic redundancy check field and the second cyclic redundancy check field correctly, the receiving station determines that the conventional signaling field is correctly transmitted.

With reference to the third implementation manner or the fourth implementation manner of the third aspect, in a fifth implementation manner of the third aspect, when multiple symbols exist in the efficient signaling field and are independently coded, the first cyclic redundancy check field is located in a first symbol of the efficient signaling field,

With reference to the third aspect, in a sixth implementation manner of the third aspect, the parsing, by the receiving station, the data packet further includes:

if the second indication value is even and not a multiple of 3 and the receiving station detects a correct third crc field in the high efficiency preamble field, the receiving station determines that the legacy signaling field is correctly transmitted,

the third cyclic redundancy check field is obtained by the sending station performing cyclic redundancy check on a part of fields in the legacy signaling field and the efficient signaling field, where the part of fields in the legacy signaling field includes any one or any combination of the following fields: rate field, reserved bits, Length field.

With reference to the third aspect and the foregoing implementation manner, in a seventh implementation manner of the third aspect, the first indication value is located in a Length field in the conventional signaling field, the first indication value is obtained by the sending station through calculation according to a packet structure of 802.11a and a lowest data transmission rate, and the first indication value is a multiple of 3.

With reference to the third aspect and the foregoing implementation manner of the third aspect, in an eighth implementation manner of the third aspect, the parsing, by the receiving station, the data packet further includes:

the receiving station parses the parity bits of the legacy signaling field in the data packet to determine whether the legacy signaling field was sent correctly.

In a fourth aspect, an embodiment of the present invention provides a data packet transmission method applied to a wireless local area network WLAN, where the method includes:

a receiving station receives a data packet, wherein the data packet comprises a preamble field and a data field, and the preamble field comprises a traditional signaling field and an efficient signaling field;

the receiving station parsing the data packet, including: if the receiving station detects that the first cyclic redundancy check field in the preamble field is correct, the receiving station determines that the conventional signaling field is correctly transmitted, where the first cyclic redundancy check field is obtained by performing a cyclic redundancy check operation on a part of fields in the conventional signaling field by a sending station, and the part of fields in the conventional signaling field includes any one or any combination of the following fields: rate field, reserved bits, Length field.

With reference to the fourth aspect, in a first implementation manner of the fourth aspect, the first cyclic redundancy check field is located in a reserved bit of the legacy signaling field, and if the receiving station detects the first cyclic redundancy check field correctly, the receiving station determines that the legacy signaling field is correctly transmitted.

With reference to the fourth aspect, in a second implementation manner of the fourth aspect, the preamble field further includes a second cyclic redundancy check field, the first cyclic redundancy check field is located in the high-efficiency signaling field, and the second cyclic redundancy check field is obtained by performing a cyclic redundancy check operation on fields, except for the first cyclic redundancy check field, in the high-efficiency signaling field by the sending station,

With reference to the fourth aspect, in a third implementation manner of the fourth aspect, the preamble field further includes a second cyclic redundancy check field, the first cyclic redundancy check field is located in the high-efficiency signaling field, and the second cyclic redundancy check field is obtained by performing a cyclic redundancy check operation on the first cyclic redundancy check field and other fields of the high-efficiency signaling field by the sending station,

With reference to the second implementation manner or the third implementation manner of the fourth aspect, in a fourth implementation manner of the fourth aspect, when multiple symbols exist in the high efficiency signaling field and are independently coded, the first cyclic redundancy check field is located in a first symbol of the high efficiency signaling field,

In a fifth aspect, an embodiment of the present invention provides a data transmission apparatus applied to a wireless local area network WLAN, where the apparatus includes:

a processing unit, configured to generate a data packet, where the data packet includes a preamble field and a data field, the preamble field includes a conventional signaling field and a high-efficiency signaling field, a Length field in the conventional signaling field carries a second indication value, the second indication value is obtained after a first indication value is processed by the processing unit, the first indication value is used to indicate a sending duration of the data packet, and the second indication value is an even number and is not a multiple of 3;

and the receiving and sending unit is used for sending the data packet generated by the processing unit, and the data packet carries the second indication value.

With reference to the fifth aspect, in a first implementation manner of the fifth aspect, the preamble field in the data packet generated by the processing unit further includes a first cyclic redundancy check field, where the first cyclic redundancy check field is obtained by performing a cyclic redundancy check operation on a partial field in the legacy signaling field by the processing unit, and the partial field in the legacy signaling field includes any one or any combination of the following fields: rate field, reserved bits, Length field.

With reference to the first implementation manner of the fifth aspect, in a second implementation manner of the fifth aspect, the first cyclic redundancy check field in the data packet generated by the processing unit is located in a reserved bit of the legacy signaling field.

With reference to the first implementation manner of the fifth aspect, in a third implementation manner of the fifth aspect, the preamble field in the data packet generated by the processing unit further includes a second cyclic redundancy check field, the first cyclic redundancy check field is located in the efficient signaling field, and the second cyclic redundancy check field is generated by performing a cyclic redundancy check on a field other than the first cyclic redundancy check field in the efficient signaling field by the processing unit.

With reference to the first implementation manner of the fifth aspect, in a fourth implementation manner of the fifth aspect, the preamble field in the data packet generated by the processing unit further includes a second cyclic redundancy check field, where the second cyclic redundancy check field is obtained by performing, by the processing unit, cyclic redundancy check operation on the first cyclic redundancy check field and other fields of the efficient signaling field, and the first cyclic redundancy check field is located in the efficient signaling field.

With reference to the third implementation manner or the fourth implementation manner of the fifth aspect, in a fifth implementation manner of the fifth aspect, when a plurality of symbols exist in a high-efficiency signaling field in a data packet generated by the processing unit and are independently encoded, the first cyclic redundancy check field is located in a first symbol of the high-efficiency signaling field.

With reference to the fifth aspect, in a sixth implementation manner of the fifth aspect, the preamble field in the data packet generated by the processing unit further includes a third cyclic redundancy check field, where the third cyclic redundancy check field is obtained by the processing unit performing a cyclic redundancy check on a partial field in the legacy signaling field and the efficient signaling field, and the partial field in the legacy signaling field includes any one or any combination of the following fields: rate field, reserved bits, Length field.

With reference to the fifth aspect and the foregoing implementation manner, in a seventh implementation manner of the fifth aspect, the first indication value in the data packet generated by the processing unit is located in a Length field in the conventional signaling field, the first indication value is calculated by the processing unit according to the transmission duration of the data packet, according to the packet structure of 802.11a and the lowest data transmission rate, and the first indication value is a multiple of 3.

With reference to the fifth aspect and the foregoing implementation manner, in an eighth implementation manner of the fifth aspect, the second indication value carried in the Length field in the data packet generated by the processing unit is an even number, and specifically, the lowest bit of the Length field is 0.

With reference to the fifth aspect and the foregoing implementation manner of the fifth aspect, in a ninth implementation manner of the fifth aspect, the legacy signaling field in the data packet generated by the processing unit further includes a parity bit.

In a sixth aspect, an embodiment of the present invention provides a data transmission apparatus applied to a wireless local area network WLAN, where the apparatus includes:

a processing unit, configured to generate a data packet, where the data packet includes a preamble field and a data field, the preamble field includes a legacy signaling field and an efficient signaling field, a first cyclic redundancy check field is located in the preamble field, the first cyclic redundancy check field is obtained by performing a cyclic redundancy check operation on a part of fields in the legacy signaling field by the processing unit, and the part of fields in the legacy signaling field includes any one or any combination of the following: rate field, reserved bit, Length field;

and the transceiving unit is used for sending the data packet generated by the processing unit, and the data packet carries the first cyclic redundancy check field.

With reference to the sixth aspect, in a first implementation manner of the sixth aspect, the first cyclic redundancy check field in the data packet generated by the processing unit is located in a reserved bit of the legacy signaling field.

With reference to the sixth aspect, in a second implementation manner of the sixth aspect, the preamble field in the data packet generated by the processing unit further includes a second cyclic redundancy check field, the first cyclic redundancy check field is located in the efficient signaling field, and the second cyclic redundancy check field is generated by performing cyclic redundancy check on fields, except for the first cyclic redundancy check field, in the efficient signaling field by the processing unit.

With reference to the sixth aspect, in a third implementation manner of the sixth aspect, the preamble field in the data packet generated by the processing unit further includes a second cyclic redundancy check field, the first cyclic redundancy check field is located in the efficient signaling field, and the second cyclic redundancy check field is obtained by performing a cyclic redundancy check operation on the first cyclic redundancy check field and other fields of the efficient signaling field by the processing unit.

With reference to the second implementation manner or the third implementation manner of the sixth aspect, in a fourth implementation manner of the sixth aspect, when multiple symbols exist in a high-efficiency signaling field in a data packet generated by the processing unit and the high-efficiency signaling field is encoded independently, the first cyclic redundancy check field is located in a first symbol of the high-efficiency signaling field.

In a seventh aspect, an embodiment of the present invention provides a data transmission apparatus applied to a wireless local area network WLAN, where the apparatus includes:

a transceiving unit, configured to receive a data packet, where the data packet includes a preamble field and a data field, where the preamble field includes a conventional signaling field and a high-efficiency signaling field, a Length field in the conventional signaling field carries a second indication value, the second indication value is obtained by processing a first indication value by a sending station, and the first indication value is used to indicate a sending duration of the data packet;

a processing unit, configured to parse the data packet received by the transceiver unit, including: if the processing unit determines that the second indication value is an even number and not a multiple of 3, the processing unit determines that the conventional signaling field is correctly transmitted, and the processing unit processes the second indication value to obtain the first indication value.

With reference to the seventh aspect, in a first implementation manner of the seventh aspect, the parsing, by the processing unit, the data packet received by the transceiver unit further includes:

if the second indication value is even and not a multiple of 3 and the processing unit detects a correct detection for the first crc field in the preamble field, the processing unit determines that the legacy signaling field is correctly transmitted,

With reference to the first implementation manner of the seventh aspect, in a second implementation manner of the seventh aspect, a first cyclic redundancy check field in a data packet received by the transceiver unit is located in a reserved bit of the legacy signaling field, and if the processing unit detects the first cyclic redundancy check field correctly, the processing unit determines that the legacy signaling field is correctly transmitted.

With reference to the first implementation manner of the seventh aspect, in a third implementation manner of the seventh aspect, the preamble field in the data packet received by the transceiver unit further includes a second cyclic redundancy check field, the first cyclic redundancy check field is located in the high-efficiency signaling field, and the second cyclic redundancy check field is obtained by performing a cyclic redundancy check operation on fields, except for the first cyclic redundancy check field, in the high-efficiency signaling field by the transmitting station,

and if the processing unit detects the first cyclic redundancy check field correctly, the processing unit determines that the traditional signaling field is sent correctly.

With reference to the first implementation manner of the seventh aspect, in a fourth implementation manner of the seventh aspect, the preamble field in the data packet received by the transceiver unit further includes a second cyclic redundancy check field, the first cyclic redundancy check field is located in the high-efficiency signaling field, and the second cyclic redundancy check field is obtained by performing a cyclic redundancy check operation on the first cyclic redundancy check field and other fields of the high-efficiency signaling field by the sending station,

if the processing unit detects that the first cyclic redundancy check field and the second cyclic redundancy check field are correct, the processing unit determines that the conventional signaling field is correctly sent.

With reference to the third implementation manner or the fourth implementation manner of the seventh aspect, in a fifth implementation manner of the seventh aspect, when multiple symbols exist in a high-efficiency signaling field in a data packet received by the transceiver unit and are independently coded, the first cyclic redundancy check field is located in a first symbol of the high-efficiency signaling field,

With reference to the seventh aspect, in a sixth implementation manner of the seventh aspect, the parsing, by the processing unit, the data packet received by the transceiver unit further includes:

if the second indication value is even and not a multiple of 3 and the processing unit detects a correct third cyclic redundancy check field in the high efficiency preamble field, the processing unit determines that the legacy signaling field is correctly transmitted,

With reference to the seventh aspect and the foregoing implementation manner, in a seventh implementation manner of the seventh aspect, a first indication value in a data packet received by the transceiver unit is located in a Length field in the conventional signaling field, where the first indication value is obtained by the sending station through calculation according to a sending duration of the data packet, a packet structure of 802.11a and a lowest data transmission rate, and the first indication value is a multiple of 3.

With reference to the seventh aspect and the foregoing implementation manner of the seventh aspect, in an eighth implementation manner of the seventh aspect, the parsing, by the processing unit, the data packet received by the transceiver unit further includes:

the processing unit parses the parity bits of the legacy signaling field in the data packet to determine whether the legacy signaling field was sent correctly.

In an eighth aspect, an embodiment of the present invention provides a data transmission apparatus applied to a wireless local area network WLAN, where the data transmission apparatus includes:

a transceiving unit for receiving a data packet, the data packet comprising a preamble field and a data field, the preamble field comprising a legacy signaling field and an efficient signaling field;

a processing unit, configured to parse the data packet received by the transceiver unit, including: if the processing unit detects that the first cyclic redundancy check field in the preamble field is correct, the processing unit determines that the legacy signaling field is correctly transmitted, where the first cyclic redundancy check field is obtained by performing a cyclic redundancy check operation on a part of fields in the legacy signaling field by a sending station, and the part of fields in the legacy signaling field includes any one or any combination of the following fields: rate field, reserved bits, Length field.

With reference to the eighth aspect, in a first implementation manner of the eighth aspect, a first cyclic redundancy check field in a data packet received by the transceiver unit is located in a reserved bit of the legacy signaling field, and if the processing unit detects the first cyclic redundancy check field correctly, the processing unit determines that the legacy signaling field is correctly sent.

With reference to the eighth aspect, in a second implementation manner of the eighth aspect, the preamble field in the data packet received by the transceiver unit further includes a second cyclic redundancy check field, the first cyclic redundancy check field is located in the high-efficiency signaling field, and the second cyclic redundancy check field is obtained by performing a cyclic redundancy check operation on fields, except for the first cyclic redundancy check field, in the high-efficiency signaling field by the sending station,

With reference to the eighth aspect, in a third implementation manner of the eighth aspect, the preamble field in the data packet received by the transceiver unit further includes a second cyclic redundancy check field, the first cyclic redundancy check field is located in the high-efficiency signaling field, and the second cyclic redundancy check field is obtained by performing a cyclic redundancy check operation on the first cyclic redundancy check field and other fields of the high-efficiency signaling field by the sending station,

With reference to the second implementation manner or the third implementation manner of the eighth aspect, in a fourth implementation manner of the eighth aspect, when multiple symbols exist in a high efficiency signaling field in a data packet received by the transceiver unit and are independently coded, the first cyclic redundancy check field is located in a first symbol of the high efficiency signaling field,

In the data packet transmission process of the wireless local area network, a sending station sends a data packet, wherein the data packet comprises a leader field and a data field, and the leader field comprises a traditional signaling field and an efficient signaling field; the station ensures that the traditional signaling field is correctly transmitted by carrying an indicating value indicating the transmission time length of the data packet and different cyclic redundancy check fields in the data packet, and the robustness of the check in the traditional signaling field is improved by the mode.

Drawings

FIG. 1 is a diagram of an application scenario in accordance with an embodiment of the present invention;

FIG. 2 is a frame structure diagram of 802.11 a;

FIG. 3 is a block diagram of the signaling field of an 802.11a frame;

FIG. 4 is a schematic diagram of a CRC check;

FIG. 5 is a frame structure diagram of 802.11 n;

FIG. 6 is a block diagram of a first symbol of a high throughput signaling field of an 802.11n frame;

FIG. 7 is a block diagram of a second symbol of the high throughput signaling field of an 802.11n frame;

FIG. 8 is a frame structure diagram of 802.11 ac;

FIG. 9 is a block diagram of the first symbol of the very high throughput signaling field of an 802.11ac frame;

FIG. 10 is a block diagram of a second symbol of the very high throughput signaling field of an 802.11ac frame;

FIG. 11 is a flowchart of a method in accordance with embodiment 1 of the present invention;

fig. 12 is a schematic structural diagram of a data packet according to embodiment 1 of the present invention;

fig. 13 is a schematic structural diagram of a conventional signaling field according to embodiment 1 of the present invention;

FIG. 14 is a diagram illustrating three types of cyclic redundancy checks in example 1 of the present invention;

FIG. 15 is a schematic view of CRC in case 1 according to embodiment 1 of the present invention;

FIG. 16 is a schematic view of CRC in case 2 according to embodiment 1 of the present invention;

FIG. 17 is a schematic view of CRC in case 3 according to embodiment 1 of the present invention;

FIG. 18 is a schematic diagram of a cyclic redundancy check in an extended situation according to embodiment 1 of the present invention;

FIG. 19 is a diagram illustrating another exemplary CRC in embodiment 1 of the present invention;

FIG. 20 is a flowchart of a method in accordance with embodiment 2 of the present invention;

FIG. 21 is a flowchart of a method in accordance with embodiment 3 of the present invention;

FIG. 22 is a diagram illustrating three types of cyclic redundancy checks in example 3 of the present invention;

FIG. 23 is a simulation result chart of embodiment 3 of the present invention;

FIG. 24 is a diagram showing another simulation result in embodiment 3 of the present invention;

FIG. 25 is a flowchart of a method in accordance with embodiment 4 of the present invention;

FIG. 26 is a logical block diagram of a station in accordance with an embodiment of the present invention;

fig. 27 is a physical structure diagram of a station of the embodiment of the present invention;

FIG. 28 is a block diagram of a cyclic redundancy check according to an embodiment of the present invention;

fig. 29 is a diagram illustrating another exemplary crc according to 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 is to be understood that the embodiments described below are only some of the embodiments of the present invention, and not all of them. 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 Station (STA) may be a wireless communication chip, a wireless sensor or a wireless communication terminal. For example: the mobile phone supporting the Wireless Fidelity (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, 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.

An Access Point (AP) is also called as a wireless Access Point or a hotspot. The AP is a special station, can provide access service for the station, can be an access point for a mobile user to enter a wired network, and is mainly deployed in a home, a building and a garden, and typically has a coverage radius of several tens of meters to hundreds of meters, and certainly, can also 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. The standard mainly used by APs at present is the Institute of Electrical and Electronics Engineers (IEEE) 802.11 series. Specifically, the AP may be a terminal device or a network device with a WiFi chip. Optionally, the AP may be a device supporting 802.11ax standard, and further optionally, the AP may be a device supporting multiple wireless local area network standards such as 802.11ac, 802.11n, 802.11g, 802.11b, and 802.11 a.

The embodiment of the invention can be applied to a wireless local area network, and the wireless local area network can be a Basic Service Set (BSS for short) containing access points. It should be understood that under the infrastructure of the WiFi system, multiple basic service sets may be included in the network, and each basic service set may include an AP and multiple STAs associated with the AP. The embodiments of the present invention are merely exemplified by stations, and the present invention is not limited thereto.

Fig. 1 is a schematic diagram of a typical WLAN deployment scenario system to which an embodiment of the present invention may be applied. Fig. 1 includes two sites: station 1 and station 2, and station 1 and station 2 communicate with each other. In this system, station 1 may transmit a data packet to station 2, and similarly, station 2 may also transmit a data packet to station 1, where the station may be the STA or the AP, and the number of stations may be one or more.

Three different data packet structures of 802.11a/n/ac in the existing WLAN standard are explained in detail below.

FIG. 2 shows a Data packet structure of 802.11a, which includes a Short Training Field (STF), a Long Training Field (LTF), a signaling Field (SIG), and a Data Field (Data Field). Wherein the data field includes a 16-bit Service field (english: Service field), 11a data (english: data), a 6-bit Tail (english: Tail) and Padding (english: Padding) bits. Note that the 11a data carries the payload of the 11a data packet.

Fig. 3 is a structural diagram of a signaling field in a data packet of 802.11a, where the signaling field includes 24 bits, specifically: rate (english: Rate)4 bits, Reserved bit (english: Reserved) 1bit, Length (english: Length)12 bits, Parity (english: Parity) 1bit, and 6 BCC (Binary convolutional code, chinese: Binary convolutional code) encoded tail bits, all of which are set to 0. The Rate field is used to indicate the transmission Rate of the data field, and is related to the Modulation and Coding Scheme (MCS) used by the data field, that is, the modulation mode and the code Rate. The Length field is used to indicate the number of bytes of 11a data. The signaling field also provides 1-bit parity bits to protect the 0 to 16 bits (Rate + Reserved + Length) of the signaling field.

In addition, the station analyzes Length and Rate information of a signaling field in the data packet, and calculates the time for keeping off (off air):

wherein T is_PREAMBLEThe duration of the preamble of the data packet in fig. 2, 16 us; t is_SIGNALDuration of signaling field, 4 us; t is_SYM4us for each period of OFDM data symbols; ceiling is an upward rounding operation; length is the Byte number (Byte) of 11a data in the traditional signaling field; 16 refers to a service field occupying 16 bits; 6 denotes BCC encoded tail bits occupying 6 bits; n is a radical of_DBPSIs a parameter derived from the Rate, as the number of data bits per OFDM symbol. For example: for the 802.11a data packet structure, each OFDM symbol has 48 data subcarriers, and if the Rate field is assigned to 0000, that is, BPSK (Binary Phase Shift Keying) modulation scheme is adopted, and 1/2 code Rate is adopted, the number of data bits of each OFDM symbol is 24, that is, N_DBPS＝24。

For the data field in the data packet, 32-bit Cyclic Redundancy Check (CRC) check bits are included for checking the protection data field. It should be noted that CRC check is a means for detecting data integrity, and fig. 4 is a schematic diagram of 8-bit CRC check. The generator polynomial is G (D) ═ D⁸+D²+D¹+1. The CRC operation specifically includes: the shift register is first reset to 1. Serial Input (english) bits are sequentially subjected to an exclusive or operation at the Input. When the last bit comes in, the bit is passed through an inverter and comes out of the shift register, and c7 is the Serial Output generated by the first bit.

Similarly, fig. 5 shows a data packet structure of 802.11n, where the data packet structure of 802.11n is a data packet with a hybrid format, and includes Legacy preambles (Legacy preambles) and High Throughput preambles (High Throughput preambles) compatible with 802.11a and 802.11 g.

FIG. 6 is a diagram of fields of HT-SIG1 (English: High Throughput Signal Field 1, Chinese: High Throughput signaling Field 1), and FIG. 7 is a diagram of fields of HT-SIG 2. The HT-SIG2 comprises 8-bit cyclic redundancy check bits for checking 0-33 bits of HT-SIG (0-23 bits of HT-SIG1 and 0-9 bits of HT-SIG 2). furthermore, HT-SIG1 and HT-SIG2 are also used for identifying different versions of data packets, so that the receiving end can distinguish between 802.11a and 802.11n data packets.

Similarly, while FIG. 8 shows the data packet structure of 802.11ac, the data packet of 802.11ac is still a data packet of mixed format, including a legacy preamble and a Very High throughput preamble. For the description of the conventional data packet, it is mentioned in the data packet of 802.11a and the data packet of 802.11n, and is not described in detail. FIG. 9 is a Field diagram of VHT-SIG-A1 (English: Very High Throughput Signal Field A1, Chinese: Very High Throughput signaling Field 1), and FIG. 10 is a Field diagram of VHT-SIG-A2.

For Very High Throughput (VHT) signaling field portions, an 8-bit cyclic redundancy check is still employed to check the 0-33 bits of VHT-SIG-A. In addition, VHT-SIG-A1 and VHT-SIG-A2 are also used to identify different versions of data packets, allowing the receiving end to distinguish between 802.11a, 802.11n and 802.11ac data packets.

For the data packet structures of 802.11n and 802.11ac, setting the Rate and the Length in the L-SIG field can be used to indicate the transmission time TXTIME of the data packet to the receiving end. For example, for a data packet of 802.11ac, the sender processes the Rate and the Length in the L-SIG field. The transmitting end sets the RATE field to 0000, that is, the lowest data RATE of the OFDM (Orthogonal Frequency Division Multiplexing, Chinese) physical layer is 6Mbit/s, corresponding to N_DBPS24. Accordingly, the transmitting end is based on 11ac dataThe transmitting time TXTIME of the packet calculates the number of transmitted symbols and the number of bytes according to the 802.11a packet structure and the lowest data transmission rate of the OFDM PHY, wherein the Length field carries the number of bytes, and the specific calculation formula is as follows:

it should be noted that the transmission time TXTIME is the transmission time of the data packet, and fig. 8 is taken as an example:

TXTIME＝T_L-PREAMBLE+T_VHT-PREAMBLE+T_VHT-SYM×N_VHT-SYMformula (3)

Wherein T is_L-PREAMBLEDuration of legacy preamble, T_VHT-PREAMBLEDuration of preamble for very high throughput, T_VHT-SYMFor a period duration of 11ac packet data portions per symbol, N_VHT-SYMThe number of data symbols transmitted for the 11ac packet data portion.

As can be seen from formula (2), for the 11ac packet structure, the Length value in the L-SIG is always a multiple of 3, and the receiving end calculates the receiving time of the data packet according to the Length in the L-SIG, and the specific calculation formula is as follows:

to summarize, the foregoing provides a comprehensive explanation of the data packet structure and field definitions in the existing WLAN standards.

Example 1

Embodiment 1 of the present invention provides a data packet transmission method for a WLAN, where the data packet transmission method may be applied to a station in fig. 1, and the station may support a next-generation WLAN standard, for example: 802.11ax format. Fig. 11 is an exemplary block diagram of the data transmission method, and the specific steps are as follows:

step 101: the sending station generates a data packet, the data packet comprises a preamble field and a data field, the preamble field comprises a traditional signaling field and a high-efficiency signaling field, a Length field in the traditional signaling field carries a second indication value, the second indication value is obtained after the sending station processes a first indication value, the first indication value is used for indicating the sending time Length of the data packet, and the second indication value is an even number and is not a multiple of 3.

Step 102: and the sending station sends the data packet, and the data packet carries the second indication value.

Specifically, fig. 12 illustrates one possible 802.11ax data packet in the above steps, which includes a Preamble field and a data field, and in order to maintain compatibility with existing WLAN-type devices, the header of the 802.11ax data packet is a Legacy Preamble field, which includes L-STF, L-LTF and L-SIG, and the Legacy Preamble field is not described in detail herein.

The Legacy Preamble field is followed by a High Efficiency signaling field (english: High Efficiency signaling field, chinese: High Efficiency signaling field) and Other High Efficiency Preamble fields, it should be noted that the Other HE Preamble refers to a field or a combination of multiple fields, and is not limited to refer to a specific field, and the Other HE Hew Preamble field is followed by a Data field (Data). It should be noted that, in the future possible WLAN standards, the names of the standards or the names of the fields, etc. may be replaced by any other names, and should not be considered as limiting the scope of the present invention.

Specifically, the first indication value is located in a Length field in the conventional signaling field, and the first indication value is calculated by the sending station according to the sending duration of the data packet, the packet structure of 802.11a and the lowest data transmission rate, where the first indication value is a multiple of 3.

Illustratively, if the transmission duration of an 11ax data packet is 100us, the packet structure of 11a includes a Preamble of 16us, a signaling field of 4us, and a remaining data field, and the minimum data transmission rate of 11a is 6Mbit/s, where each 11a data symbol carries 24 bits of information and the symbol period is 4us, so that the byte number of the first indication value is 57Bytes, and the specific calculation formula is (100-16-4)/4 × 24/8-3 ═ 57. It should be noted that the subtracted 3 bytes are the service field and tail padding bits in the 11a packet, and the first indication value is 57bytes, and the first indication value does not represent the true length of the 11ax data packet, but carries only the information of the transmission duration of the 11ax data packet.

Specifically, the second indication value carried by the Length field is an even number, and specifically, the lowest bit of the Length field is 0.

It should be noted that fig. 13 is a detailed structure diagram of the conventional signaling field, and the LSB bits (english: Least Significant Bit, chinese: Least weight bits) in fig. 13 are the Least Significant bits of the Length field.

In step 101, the specific process of the second indication value obtained by processing the first indication value by the sending station is as follows:

it should be noted that Length is described in the following₁Indicating a first indication value carried by a Length, Length₂Refers to the second indication value carried by Length. The sending station processes the first indication value by, but not limited to, table lookup, formula calculation, and according to a certain calculation rule, which is not limited to the present invention.

As can be seen from the foregoing, Length₁The first indicator value carried is always a multiple of 3, so the cases are respectively considered as odd number and even number. When Length₁Is odd, i.e., Length₁6K +3, K0, 1, 2, 3, an odd number is additionally added, for example: 1; when Length₁Is an even number, i.e. Length₁6K, K0, 1, 2, 3, an even number is additionally added, for example: 2. the processing procedure is shown in the following formula:

the arithmetic operation processing is carried out on the Length by the parity division case, for example: additionally adding 1 or 2 to change the value of the Length from the first indication value to a second indication value, so that the value of the Length is no longer a multiple of 3, and a receiving end with 11ax can distinguish whether the type of the received data packet is 11 ax; in addition, the value of the Length is always even, that is, the lowest bit of the Length is always 0, which can help the receiving end to check whether the transmission of the Length is correct by checking whether the lowest bit is 0.

Optionally, as another embodiment, the preamble field further includes a first cyclic redundancy check field, where the first cyclic redundancy check field is obtained by performing a cyclic redundancy check operation on a part of fields in the legacy signaling field by the sending station, and the part of fields in the legacy signaling field includes any one or any combination of the following fields: rate field, reserved bits, Length field.

Specifically, the generation of the first cyclic redundancy check field includes any one or two fields, for example: the first cyclic redundancy check field can be obtained by the sending station performing cyclic redundancy check operation on a Rate field in the traditional signaling field; the first cyclic redundancy check field can be obtained by the sending station performing cyclic redundancy check operation on a Length field in a traditional signaling field; the first cyclic redundancy check field can be obtained by the sending station performing cyclic redundancy check operation on a Rate field and a Length field in a traditional signaling field; the first cyclic redundancy check field can be obtained by the sending station performing cyclic redundancy check operation on a Rate field and a reserved bit in a traditional signaling field; the first crc field may be obtained by the transmitting station performing a crc operation on the Length field and the reserved bits in the legacy signaling field.

In addition, the generation of the first crc field may be performed by the sending station performing crc operation on a part of bits of the Rate field, and the generation of the first crc field may be performed by the sending station performing crc operation on a part of bits of the Length field.

The above-mentioned generation manner of the first cyclic redundancy check field is several exemplary cases, and does not limit other cases.

It should be noted that the location of the first crc field and the checking operation at least include three cases, as shown in fig. 14.

Alternatively, case 1 is shown in fig. 15: the first cyclic redundancy check field is located in reserved bits of the legacy signaling field. Illustratively, the first CRC is obtained by performing a CRC check on a Length field with a Length of 12 bits in the L-SIG, and the first CRC takes one bit.

Alternatively, case 2 is shown in fig. 16: the preamble field further includes a second cyclic redundancy check field, the first cyclic redundancy check field is located in the high-efficiency signaling field, and the second cyclic redundancy check field is generated by the sending station performing cyclic redundancy check on fields in the high-efficiency signaling field except for the first cyclic redundancy check field. Illustratively, the first CRC is obtained by CRC checking a Length field of Length 12 bits in the L-SIG, wherein the first CRC takes up one or more bits and the second CRC is generated independent of the content of the first CRC.

Alternatively, case 3 is shown in fig. 17: the preamble field further includes a second cyclic redundancy check field, the second cyclic redundancy check field is obtained by performing a cyclic redundancy check operation on the first cyclic redundancy check field and other fields of the high efficiency signaling field at the sending station, and the first cyclic redundancy check field is located in the high efficiency signaling field. Illustratively, the first CRC is obtained by CRC checking a Length field of Length 12 bits in the L-SIG, wherein the first CRC takes one or more bits and the generation of the second CRC depends on the content of the first CRC.

Optionally, when the high efficiency signaling field has multiple symbols and is independently coded, the first cyclic redundancy check field is located in the first symbol of the high efficiency signaling field. Specifically, as shown in fig. 18, HE-SIG-a includes two symbols HE-SIG-a1 and HE-SIG-a2, with the first CRC field located in HE-SIG-a1 and the second CRC field located in HE-SIG-a 2.

Optionally, as another embodiment, the preamble field further includes a third cyclic redundancy check field, where the third cyclic redundancy check field is obtained by the sending station performing a cyclic redundancy check on a partial field in the legacy signaling field and the efficient signaling field, and the partial field in the legacy signaling field includes any one or any combination of the following fields: rate field, reserved bits, Length field.

Illustratively, as shown in fig. 19, the third CRC field is obtained by performing a joint CRC on the Length information in the L-SIG and the HE-SIG-a.

It should be noted that the third CRC field mentioned here is only for distinguishing from the CRC field mentioned above, and does not indicate that the data packet includes three or more CRC fields, and the third CRC field generation process is similar to the first CRC field, and is not described again.

Optionally, as another embodiment, the legacy signaling field further includes a parity bit.

It should be noted that the parity bits account for 1bit, and the transmitting station uses the parity bits to check and protect the content of the conventional signaling field. The method for the sending station to check and protect the conventional signaling field by using the parity check bits may be implemented alone, or implemented together with the method for the sending station to check and protect the conventional signaling field by using the second indication value, or implemented together with the method for the sending station to check and protect the conventional signaling field by using the first CRC field and the second CRC field, or implemented together with the method for the sending station to check and protect the conventional signaling field by using the third CRC field.

Optionally, as another embodiment, the sending station determines whether to process a Length field in the legacy signaling field according to the channel quality.

Specifically, the channel quality of the indoor scenario is better, and the channel quality of the outdoor scenario is worse. And the transmitting station determines whether to process the Length field in the traditional signaling field according to the quality difference of the channel.

Optionally, if the scene is an outdoor scene, the sending station obtains a second indication value by performing arithmetic operation on a first indication value carried by a Length field, where the second indication value carried by the Length field in the conventional signaling field is not a multiple of 3; if the scene is an indoor scene, the sending station does not perform arithmetic operation on the first indication value, and the first indication value carried by the Length field in the traditional signaling field is a multiple of 3.

Optionally, if the scene is an indoor scene, the sending station obtains a second indication value by performing arithmetic operation on a first indication value carried by a Length field, where the second indication value carried by the Length field in the conventional signaling field is not a multiple of 3; if the scene is an outdoor scene, the sending station does not perform arithmetic operation on the first indication value, and the first indication value carried by the Length field in the traditional signaling field is a multiple of 3.

It should be noted that, the specific step of the arithmetic operation is shown in formula (5), and the sending station sets the Length field in the conventional signaling field, so that the data packet includes information of the sending scenario, which is beneficial for the receiving station to receive the data packet, and improves the accuracy and robustness of receiving the data packet.

In the data packet transmission process of the wireless local area network, a sending station sends a data packet, wherein the data packet comprises a leader field and a data field, and the leader field comprises a traditional signaling field and an efficient signaling field; the transmitting station ensures that the traditional signaling field is correctly transmitted by carrying an indicating value indicating the transmitting time length of the data packet and different cyclic redundancy check fields in the data packet, and the robustness of the check in the traditional signaling field is improved by the mode.

Example 2

Embodiment 2 of the present invention provides a data packet transmission method for a WLAN, where the data packet transmission method may be applied to a station in fig. 1, and the station may support a next-generation WLAN standard, for example: 802.11ax format. Fig. 20 is an exemplary block diagram of the data transmission method, and the specific steps are as follows:

step 201: a sending station generates a data packet, where the data packet includes a preamble field and a data field, the preamble field includes a legacy signaling field and an efficient signaling field, a first cyclic redundancy check field is located in the preamble field, the first cyclic redundancy check field is obtained by the sending station performing a cyclic redundancy check operation on a part of fields in the legacy signaling field, and the part of fields in the legacy signaling field includes any one or any combination of the following: rate field, reserved bits, Length field.

Step 202: and the sending station sends the data packet, and the data packet carries the first cyclic redundancy check field.

It should be noted that the structure of the data packet and the generation manner of the first cyclic redundancy check field in step 201 have been explained in detail in embodiment 1, and are not described herein again.

It should be noted that the specific steps of the arithmetic operation are shown in formula (5). The transmitting station sets the Length field in the traditional signaling field, so that the data packet contains the information of the transmitting scene, the receiving station is favorable for receiving the data packet, and the accuracy and the robustness of receiving the data packet are improved.

In the data packet transmission process of the wireless local area network, a sending station sends a data packet, wherein the data packet comprises a leader field and a data field, and the leader field comprises a traditional signaling field and an efficient signaling field; the transmitting station ensures that the traditional signaling field is correctly transmitted by carrying different cyclic redundancy check fields in the data packet, and the robustness of the check in the traditional signaling field is improved by the mode.

Example 3

Embodiment 3 of the present invention provides a data packet transmission method for a WLAN, where the data packet transmission method may be applied to a station STA in fig. 1, and the station may support a next-generation WLAN standard, for example: 802.11ax format. Fig. 21 is an exemplary block diagram of the data transmission method, and the specific steps are as follows:

step 301: the receiving station receives a data packet, the data packet comprises a preamble field and a data field, the preamble field comprises a traditional signaling field and a high-efficiency signaling field, a Length field in the traditional signaling field carries a second indication value, the second indication value is obtained after the sending station processes a first indication value, and the first indication value is used for indicating the sending time Length of the data packet.

Step 302: the receiving station parsing the data packet, including: if the receiving station determines that the second indication value is an even number and not a multiple of 3, the receiving station determines that the conventional signaling field is correctly transmitted, and the receiving station processes the second indication value to obtain the first indication value.

It should be noted that the structure of the data packet in step 301 has been explained in detail in embodiment 1, and is not described herein again.

Specifically, the first indication value is located in a Length field in the conventional signaling field, the first value is calculated by the sending station according to the sending duration of the data packet, the packet structure of 802.11a and the lowest transmission data rate, and the first indication value is a multiple of 3. It should be noted that the specific calculation of the first indication value is explained in detail in embodiment 1, and is not described herein again.

It should be noted that the parsing of the data packet by the receiving station includes determining whether the data packet is of a packet structure of 11ax according to whether the repeated HE-SIG-a or the repeated L-SIG is after the L-SIG. Specifically, if the receiving station further includes repeated L-SIG after parsing L-SIG in the data packet, the receiving station determines that the data packet is an 11ax data packet; if the receiving station also includes the repeated HE-SIG-a after analyzing the L-SIG in the data packet, the receiving station determines that the data packet is an 11ax data packet.

It should be noted that the step 302 of the receiving station determining that the second indication value is an even number and is not a multiple of 3 specifically includes: the second indication value is even (i.e., the lowest bit is 0) in condition 1, and is not a multiple of 3 in condition 2.

Specifically, if the lowest bit is 0, the receiving station determines that the conventional signaling field is correctly transmitted, and continues to analyze subsequent fields of the data packet; if the lowest bit is not 0, the receiving station determines that the traditional signaling field is sent in error, and stops analyzing the subsequent fields of the data packet.

Specifically, in embodiment 1, it is mentioned that the first indication value in the legacy signaling field is a multiple of 3, and the receiving end detects whether the second indication value in the L-SIG is a multiple of 3. If the second indication value is a multiple of 3, the data packet is in a non-11 ax packet structure, and the receiving station continues to perform according to the flow of the existing WLAN standard; if the second indicator value is not a multiple of 3, the data packet is an 11ax packet structure and the receiving station recovers the first indicator value in the Length field.

It should be noted that Length is described in the following₁Indicating a first indication value carried by a Length, Length₂Refers to the second indication value carried by Length. The method for the receiving station to recover the first indication value in the Length field includes, but is not limited to, table lookup, formula calculation, and calculation according to a certain calculation rule, and does not limit the present invention.

Illustratively, if Length₂If the field has a value of 6K +4, the station is aligned with the Length₂Field minus 1, if Length₂If the field has a value of 6K +2, the station is aligned with the Length₂The field is decremented by 2. Station connectorAnd restoring the first indication value through the operation.

Optionally, as another embodiment, if the second indication value is even and not a multiple of 3, and the receiving station detects that the first cyclic redundancy check field in the preamble field is correct, the receiving station determines that the legacy signaling field is correctly sent.

It should be noted that, in embodiment 1, the first cyclic redundancy check field and the second cyclic redundancy check field in the data packet have been explained in detail, and are not described herein again.

Optionally, as another embodiment, the receiving station parses the first cyclic redundancy check field and the second cyclic redundancy check field in the preamble field, and determines whether the legacy signaling field is correctly transmitted includes at least three cases, as shown in fig. 22.

Optionally, in case 1, the first cyclic redundancy check field is located in a reserved bit of the legacy signaling field, and if the receiving station detects the first cyclic redundancy check field correctly, the receiving station determines that the legacy signaling field is correctly transmitted.

It should be noted that, the data packet structure in case 1 is shown in fig. 15, where the first CRC field is located in the reserved bit of the L-SIG and occupies 1bit, and if the receiving station checks the first CRC field correctly, the station obtains the value of the Length field, and can calculate the transmission time TXTIME of the data packet according to the value of the Length field, so as to reserve enough non-space time for receiving the data packet; if the station checks the first CRC field for errors, the station stops parsing the subsequent fields.

Optionally, in case 2, the preamble field further includes a second cyclic redundancy check field, the first cyclic redundancy check field is located in the high efficiency signaling field, and the second cyclic redundancy check field is obtained by performing a cyclic redundancy check operation on a field, except for the first cyclic redundancy check field, in the high efficiency signaling field by the sending station.

It should be noted that, the data packet structure in case 2 is shown in fig. 16, where the first CRC field is located in the reserved bits of the HE-SIG and occupies one or more bits, and if the receiving station checks the first CRC field and the second CRC field correctly, the station obtains the value of the Length field, and may calculate the transmission time TXTIME of the data packet according to the value of the Length field, so as to reserve enough non-space time for receiving the data packet; if the station checks the first CRC field for errors, the station stops parsing the subsequent fields.

Optionally, in case 3, the preamble field further includes a second cyclic redundancy check field, the first cyclic redundancy check field is located in the high efficiency signaling field, and the second cyclic redundancy check field is obtained by performing a cyclic redundancy check operation on the first cyclic redundancy check field and other fields of the high efficiency signaling field by the transmitting station,

It should be noted that the data packet structure in case 3 is shown in fig. 17, where the first CRC field is located in HE-SIG and occupies one or more bits, the station checks the second CRC field first and then checks the first CRC field, and if the check is correct, the station obtains the value of the Length field, and may calculate the transmission time TXTIME of the data packet according to the value of the Length field, so as to reserve sufficient non-space time for receiving the data packet; if the station checks the first CRC field or the first CRC field for errors, the station stops parsing the subsequent fields.

Optionally, when the high efficiency signaling field has multiple symbols and is coded independently, the first cyclic redundancy check field is located in the first symbol of the high efficiency signaling field, and the receiving station detects the first cyclic redundancy check field and the second cyclic redundancy check field to determine whether the legacy signaling field is transmitted correctly.

For example, the data packet structure is shown in fig. 18, where HE-SIG-a contains two symbols HE-SIG-a1 and HE-SIG-a2, the first CRC field is located in HE-SIG-a1, and the second CRC field is located in HE-SIG-a 2. The station checks the second CRC field first, then checks the first CRC field, if the check is correct, the station obtains the value of the Length field, and can calculate the sending time TXTIME of the data packet according to the value of the Length field, thereby reserving enough non-empty time for receiving the data packet; if the station checks the CRC field for errors, the station stops analyzing the subsequent field. The first CRC field is located in HE-SIG-a1, which facilitates earlier parsing of the first CRC information by the station to detect whether the Length field in the L-SIG is correct.

Optionally, as another embodiment, if the second indication value is even and not a multiple of 3, and the receiving station detects that the third crc field in the high efficiency preamble field is correct, the receiving station determines that the legacy signaling field is correctly transmitted.

Specifically, the data packet structure is as shown in fig. 19, where the third CRC field is located in HE-SIG-a and occupies one or more bits, and if the station checks the third CRC field correctly, the station obtains a value of a Length field, and may calculate a transmission time TXTIME of the data packet according to the value of the Length field, so as to reserve sufficient non-space time for receiving the data packet; if the station checks the third CRC field for errors, the station stops parsing the subsequent fields.

Optionally, as another embodiment, the receiving station parses parity bits of a legacy signaling field in the data packet to determine whether the legacy signaling field is correctly transmitted.

It should be noted that the parity bit occupies 1bit, and the receiving station uses the parity bit to check the content of the conventional signaling field. The method for checking the conventional signaling field using the parity bits by the receiving station may be implemented alone, or together with the aforementioned method for checking the conventional signaling field using the second indication value, or together with the aforementioned method for checking the conventional signaling field using the first CRC field and the second CRC field, or together with the aforementioned method for checking the conventional signaling field using the third CRC field.

It should be noted that the parity bits of the conventional signaling field may be checked by the receiving station alone, or may be jointly checked in combination with the aforementioned first CRC field and the second CRC field.

Optionally, as another embodiment, the receiving station parses a Length field in the legacy signaling field to determine the channel quality.

Specifically, the channel quality of the indoor scenario is better, and the channel quality of the outdoor scenario is worse. The receiving station determines the quality of the channel by analyzing the Length field in the traditional signaling field, thereby determining the corresponding receiving mode to receive the data.

Optionally, the receiving station parses the Length field to carry an indication value. If the indicated value is not a multiple of 3, the receiving station determines that the transmission scene of the data packet is an outdoor scene, and the receiving station receives data in a more robust receiving mode; if the indicated value is a multiple of 3, the receiving station determines that the transmission scene of the data packet is an indoor scene, and the receiving station receives data in a normal receiving mode.

Optionally, the receiving station parses the Length field to carry an indication value. If the indicated value is not a multiple of 3, the receiving station determines that the transmission scene of the data packet is an indoor scene, and the receiving station receives data in a normal receiving mode; if the indicated value is a multiple of 3, the receiving station determines that the transmission scene of the data packet is an outdoor scene, and the receiving station receives data in a more robust receiving mode.

The receiving station analyzes the Length field in the traditional signaling field to obtain the information of the sending scene in the data packet, thereby improving the accuracy and robustness of receiving the data packet.

It should be noted that a simulation result is obtained by performing computer simulation on several implementation manners of the embodiment of the present invention. Simulation results show that the implementation mode of the embodiment of the invention can improve the robustness of the verification in the traditional signaling field, and the simulation results are shown in figures 23 and 24.

The simulated channel is a UMi NLoS (English: Urban Microcell None Line of Sight, Chinese: Urban microcellular non-Line of Sight) channel, and the simulation parameters comprise: the number of the data packets is 50,000, the length of the cyclic prefix is 0.8us, the antenna transmits and receives only, and no frequency offset or phase noise exists. It should be noted that the simulation parameters are not listed in their entirety, and do not limit the present invention.

It should be noted that, in fig. 23, the abscissa represents a signal-to-Noise Ratio (SNR), and the ordinate represents an error rate of L-SIG detected by using different verification schemes. The detailed explanation of the 5 curves in fig. 23 is as follows:

1) the scheme is the prior art, and the parity check bits of 1bit are only used for carrying out check protection on RATE + Reserved + LENGTH in the L-SIG.

Because only 1-bit parity check bits are adopted, only odd errors can be detected, and even errors cannot be detected, the errors detected by the scheme 1 are smaller than the errors in actual transmission and are not accurate enough.

2) L-SIG (LENGTH comp, optimal detected PER): and the ideal packet error rate is the real error rate of the LENGTH field of the L-SIG.

The curve of scheme 2 is a reference value, and other schemes distinguish the advantages and disadvantages of different schemes by comparing with the curve.

3) L-SIG (with 2bit additional CRC in HE-SIGA), there are 2 bits of CRC check bits in the HE-SIGA field.

Scheme 3 detects errors in the L-SIG by setting a 2-bit CRC check code in the HE-SIGA. It should be noted that the CRC check code of 2 bits in the scheme 3 is the first CRC in the embodiment.

4) L-SIG (check if LSB of Length is always 0), and whether the LSB bit of the second indication value is 0 is detected.

Scheme 4 detects an error in the L-SIG by detecting whether the lowest bit of the second indication value in the Length field is 0.

5) L-SIG (with 1bit additional parity check in HE-SIGA), there are 1bit parity bits in the HE-SIGA field.

Scheme 5 detects errors in the L-SIG by setting a parity of 1bit in the HE-SIGA field. In addition, the parity bit of the 1bit can also be positioned in the reserved bit of the L-SIG, and the simulation result is the same as that of the parity bit of the 1bit positioned in the HE-SIGA. It should be noted that the parity check code of 1bit in the scheme 5 is the first CRC in the embodiment, and the CRC check of 1bit is the same as the parity check.

As can be seen from the simulation of fig. 23, the schemes 3 to 5 can detect errors in L-SIG more robustly than the reference value curve 2, and the prior art curve 1 cannot detect errors in L-SIG truly.

It should be noted that, in fig. 24, the settings of the abscissa, the ordinate and the simulation parameter are the same as those in fig. 23, and the schemes represented by the curve 1 and the curve 2 are the same as those in fig. 23 and are not repeated. The other curves in fig. 24 are explained in detail below:

6)L-SIG(check if LSB of LENGTH is always 0&1bit additional paritycheck in HE-SIGA)。

scheme 6 simultaneously detects whether the LSB bit of the second indication value is 0 and a 1-bit parity bit on the HE-SIGA. In addition, the parity bit of the 1bit can also be positioned in the reserved bit of the L-SIG, and the simulation result is the same as that of the parity bit of the 1bit positioned in the HE-SIGA. It should be noted that the parity check code of 1bit in the scheme 6 is the first CRC in the embodiment, and the CRC check of 1bit is the same as the parity check.

7)L-SIG(combined 8 bit CRC for LENGTH of L-SIG and HE-SIGA)。

And the scheme 7 performs 8-bit CRC on the Length field in the L-SIG and the content of the HE-SIGA at the same time. Note that the 8-bit CRC in scheme 7 is the third CRC in the embodiment.

As can be seen from the simulation of fig. 24, the schemes 6 to 7 can detect errors in L-SIG more robustly than the reference value curve 2, and the prior art curve 1 cannot detect errors in L-SIG truly.

In the data packet transmission process of the wireless local area network, a receiving station receives a data packet, wherein the data packet comprises a leader field and a data field, and the leader field comprises a traditional signaling field and an efficient signaling field; the receiving station determines whether the traditional signaling field is correctly transmitted or not by analyzing the indicated value for identifying the data packet transmission duration in the traditional signaling field and different cyclic redundancy fields, and the robustness of the check in the traditional signaling field is improved by the above mode.

Example 4

Embodiment 4 of the present invention provides a data packet transmission method for a WLAN, where the data packet transmission method may be applied to a station STA in fig. 1, and the station may support a next-generation WLAN standard, for example: 802.11ax format. Fig. 25 is an exemplary block diagram of the data transmission method, and the specific steps are as follows:

step 401: a receiving station receives a data packet comprising a preamble field and a data field, the preamble field comprising a legacy signaling field and an efficient signaling field.

Step 402: the receiving station parsing the data packet, including: if the receiving station detects that the first cyclic redundancy check field in the preamble field is correct, the receiving station determines that the conventional signaling field is correctly transmitted, where the first cyclic redundancy check field is obtained by performing a cyclic redundancy check operation on a part of fields in the conventional signaling field by a sending station, and the part of fields in the conventional signaling field includes any one or any combination of the following fields: rate field, reserved bits, Length field.

It should be noted that the structure of the data packet in step 401 is explained in detail in embodiment 1, and the generation manner of the first cyclic redundancy check field is also explained in detail in the foregoing embodiment, which is not described herein again.

Optionally, as another embodiment, the receiving station parses the first cyclic redundancy check field and the second cyclic redundancy check field in the preamble field, and determines whether the legacy signaling field is correctly transmitted includes at least three cases, as shown in fig. 14.

Optionally, in case 2, the preamble field further includes a second cyclic redundancy check field, the first cyclic redundancy check field is located in the high efficiency signaling field, and the second cyclic redundancy check field is obtained by performing a cyclic redundancy check operation on a field other than the first cyclic redundancy check field in the high efficiency signaling field by the transmitting station,

In the data packet transmission process of the wireless local area network, a receiving station receives a data packet, wherein the data packet comprises a leader field and a data field, and the leader field comprises a traditional signaling field and an efficient signaling field; the receiving station determines whether the traditional signaling field is correctly sent or not by analyzing different cyclic redundancy fields in the traditional signaling field, and the robustness of the check in the traditional signaling field is improved by the above mode.

Example 5

Fig. 26 is a schematic block diagram of a data transmission apparatus in a wireless local area network according to embodiment 5 of the present invention. The data transmission means are for example stations or dedicated circuits or chips implementing the relevant functions. The data transmission device 50 shown in fig. 26 includes a transceiver unit 501 and a processing unit 502. The data transmission device 50 may be, for example, a station shown in fig. 1.

Processing unit 502, is used for generating data packet, data packet includes preamble field and data field, preamble field includes traditional signaling field and high-efficient signaling field, the Length field in traditional signaling field carries the second indicating value, the second indicating value by processing unit 502 obtains after handling first indicating value, first indicating value is used for instructing data packet's transmission duration, the second indicating value is the even number and is not the multiple of 3.

A transceiver 501, configured to send the data packet generated by the processing unit, where the data packet carries the second indication value.

Specifically, the first indication value in the data packet generated by the processing unit 502 is located in a Length field in the conventional signaling field, and the first indication value is calculated by the processing unit 502 according to the transmission duration of the data packet, the packet structure of 802.11a and the lowest data transmission rate, where the first indication value is a multiple of 3.

Specifically, the second indication value carried by the Length field in the data packet generated by the processing unit 502 is an even number, specifically, the lowest bit of the Length field is 0.

It should be noted that the data packet, the first indication value and the second indication value have been explained in detail in embodiment 1, and are not described herein again.

Optionally, the preamble field in the data packet generated by the processing unit 502 further includes a first cyclic redundancy check field, where the first cyclic redundancy check field is obtained by the processing unit 502 performing a cyclic redundancy check operation on a partial field in the conventional signaling field, and the partial field in the conventional signaling field includes any one or any combination of the following fields: rate field, reserved bits, Length field.

It should be noted that the generation of the first crc field is explained in detail in embodiment 1, and is not described herein again.

Optionally, the processing unit 502 includes at least three cases for the position of the first cyclic redundancy check field and the check operation.

Optionally, in case 1, the first cyclic redundancy check field in the data packet generated by the processing unit 502 is located in the reserved bits of the legacy signaling field.

Optionally, in case 2, the preamble field in the data packet generated by the processing unit 502 further includes a second cyclic redundancy check field, the first cyclic redundancy check field is located in the efficient signaling field, and the second cyclic redundancy check field is generated by the processing unit 502 performing a cyclic redundancy check on a field other than the first cyclic redundancy check field in the efficient signaling field.

Optionally, in case 3, the preamble field in the data packet generated by the processing unit 502 further includes a second cyclic redundancy check field, where the second cyclic redundancy check field is obtained by performing a cyclic redundancy check operation on the first cyclic redundancy check field and another field of the efficient signaling field by the processing unit 502, and the first cyclic redundancy check field is located in the efficient signaling field.

Optionally, when multiple symbols exist in the high efficiency signaling field in the data packet generated by the processing unit 502 and are independently encoded, the first cyclic redundancy check field is located in the first symbol of the high efficiency signaling field.

It should be noted that, for the case that the efficient signaling field has multiple symbols, detailed descriptions are already given in embodiment 1 and are not repeated.

Optionally, as another embodiment, the preamble field in the data packet generated by the processing unit 502 further includes a third cyclic redundancy check field, where the third cyclic redundancy check field is obtained by the processing unit 502 performing a cyclic redundancy check on a partial field in the conventional signaling field and the efficient signaling field, and the partial field in the conventional signaling field includes any one or any combination of the following fields: rate field, reserved bits, Length field.

It should be noted that the generation of the third crc field is explained in detail in embodiment 1, and is not described herein again.

Optionally, as another embodiment, the legacy signaling field in the data packet generated by the processing unit 502 further includes a parity bit.

It should be noted that the processing of the parity bits is explained in detail in embodiment 1, and is not described here again.

Optionally, as another embodiment, the processing unit 502 determines whether to process a Length field in a legacy signaling field according to the channel quality.

It should be noted that the processing of the Length field by the processing unit 502 according to the channel quality has been explained in detail in embodiment 1, and is not described herein again.

In the data packet transmission process of the wireless local area network, a receiving and sending unit sends a data packet, wherein the data packet comprises a leader field and a data field, and the leader field comprises a traditional signaling field and an efficient signaling field; the processing unit guarantees that the traditional signaling field is correctly sent by carrying an indicating value indicating the sending time length of the data packet and different cyclic redundancy check fields in the data packet, and the robustness of the check in the traditional signaling field is improved by the mode.

Example 6

Fig. 26 is a schematic block diagram of a data transmission apparatus in a wireless local area network according to embodiment 6 of the present invention. The data transmission means are for example stations or dedicated circuits or chips implementing the relevant functions. The data transmission device 50 shown in fig. 26 includes a transceiver unit 501 and a processing unit 502. The data transmission device 50 may be, for example, a station shown in fig. 1.

A processing unit 502, configured to generate a data packet, where the data packet includes a preamble field and a data field, the preamble field includes a legacy signaling field and an efficient signaling field, a first cyclic redundancy check field is located in the preamble field, the first cyclic redundancy check field is obtained by performing a cyclic redundancy check operation on a part of fields in the legacy signaling field by the processing unit, and the part of fields in the legacy signaling field includes any one or any combination of the following: rate field, reserved bit, Length field;

a transceiving unit 501, configured to send the data packet generated by the processing unit, where the data packet carries the first cyclic redundancy check field.

It should be noted that the structure of the data packet has been explained in detail in embodiment 1, and is not described herein again.

It should be noted that the processing of the Length field by the processing unit 502 according to the channel quality has been explained in detail in embodiment 2, and is not described herein again.

In the data packet transmission process of the wireless local area network, a receiving and sending unit sends a data packet, wherein the data packet comprises a leader field and a data field, and the leader field comprises a traditional signaling field and an efficient signaling field; the processing unit ensures that the traditional signaling field is correctly sent by carrying different cyclic redundancy check fields in the data packet, and the robustness of the check in the traditional signaling field is improved by the mode.

Example 7

Fig. 26 is a schematic block diagram of a data transmission apparatus in a wireless local area network according to embodiment 7 of the present invention. The data transmission means are for example stations or dedicated circuits or chips implementing the relevant functions. The data transmission device 50 shown in fig. 26 includes a transceiver unit 501 and a processing unit 502. The data transmission device 50 may be, for example, a station shown in fig. 1.

The transceiving unit 501 is configured to receive a data packet, where the data packet includes a preamble field and a data field, the preamble field includes a legacy signaling field and a high-efficiency signaling field, a Length field in the legacy signaling field carries a second indication value, the second indication value is obtained after a sending station processes a first indication value, and the first indication value is used to indicate a sending duration of the data packet.

A processing unit 502, configured to parse the data packet received by the transceiving unit, including: if the processing unit determines that the second indication value is an even number and not a multiple of 3, the processing unit determines that the conventional signaling field is correctly transmitted, and the processing unit processes the second indication value to obtain the first indication value.

Specifically, the first indication value in the data packet received by the transceiving unit 501 is located in a Length field in the conventional signaling field, and the first indication value is calculated by the sending station according to the sending duration of the data packet, the packet structure of 802.11a and the lowest data transmission rate, where the first indication value is a multiple of 3.

Optionally, the parsing, by the processing unit 502, the data packet received by the transceiving unit 501 further includes:

if the second indication value is even and not a multiple of 3, and the processing unit 502 detects that the first crc field in the preamble field is correct, the processing unit 502 determines that the legacy signaling field is correctly transmitted.

Optionally, as another embodiment, the processing unit 502 parses the first cyclic redundancy check field and the second cyclic redundancy check field in the preamble field, and determines whether the legacy signaling field is correctly transmitted in three cases.

Optionally, in case 1, a first cyclic redundancy check field in the data packet received by the transceiving unit 501 is located in a reserved bit of the legacy signaling field, and if the processing unit 502 detects that the first cyclic redundancy check field is correct, the processing unit 502 determines that the legacy signaling field is correctly transmitted.

Optionally, in case 2, the preamble field in the data packet received by the transceiver unit 501 further includes a second cyclic redundancy check field, the first cyclic redundancy check field is located in the high efficiency signaling field, and the second cyclic redundancy check field is obtained by performing a cyclic redundancy check operation on a field, except for the first cyclic redundancy check field, in the high efficiency signaling field by the transmitting station.

If the processing unit 502 detects the first crc correctly, the processing unit 502 determines that the conventional signaling field is correctly transmitted.

Optionally, in case 3, the preamble field in the data packet received by the transceiver unit 501 further includes a second cyclic redundancy check field, the first cyclic redundancy check field is located in the high-efficiency signaling field, and the second cyclic redundancy check field is obtained by performing a cyclic redundancy check operation on the first cyclic redundancy check field and other fields of the high-efficiency signaling field by the transmitting station.

If the processing unit 502 detects that the first cyclic redundancy check field and the second cyclic redundancy check field are correct, the processing unit 502 determines that the conventional signaling field is correctly transmitted.

Alternatively, when a plurality of symbols exist in the high efficiency signaling field in the data packet received by the transceiving unit 501 and are independently coded, the first cyclic redundancy check field is located in the first symbol of the high efficiency signaling field,

Optionally, as another embodiment, the parsing, by the processing unit 502, the data packet received by the transceiver unit 501 further includes:

if the second indication value is even and not a multiple of 3, and the processing unit 502 detects a correct detection for the third crc field in the high efficiency preamble field, the processing unit 502 determines that the legacy signaling field is correctly transmitted,

It should be noted that the structure of the data packet and the process of parsing the data packet by the processing unit 502 are explained in detail in embodiment 1, and are not described herein again.

Optionally, as another embodiment, the parsing, by the processing unit 502, the data packet further includes:

the processing unit 502 parses the parity bits of the legacy signaling field in the data packet received by the transceiving unit 501, and determines whether the legacy signaling field is correctly transmitted.

It should be noted that the processing procedure of the parity bits by the processing unit 502 has been explained in the foregoing embodiments, and is not described again.

Optionally, as another embodiment, the processing unit 502 parses a Length field in the legacy signaling field to determine the channel quality.

It should be noted that, the processing unit 502 has been explained in detail in embodiment 3 according to the process of parsing the Length field in the conventional signaling field, and is not described herein again.

In the data packet transmission process of the wireless local area network, a receiving and transmitting unit receives a data packet, wherein the data packet comprises a preamble field and a data field, and the preamble field comprises a traditional signaling field and an efficient signaling field; the processing unit determines whether the traditional signaling field is correctly transmitted or not by analyzing the indicated value for identifying the data packet transmission duration in the traditional signaling field and different cyclic redundancy fields, and the robustness of the check in the traditional signaling field is improved by the above mode.

Example 8

Fig. 26 is a schematic block diagram of a data transmission apparatus in a wireless local area network according to embodiment 8 of the present invention. The data transmission means are for example stations or dedicated circuits or chips implementing the relevant functions. The data transmission device 50 shown in fig. 26 includes a transceiver unit 501 and a processing unit 502. The data transmission device 50 may be, for example, a station shown in fig. 1.

A transceiving unit 501, configured to receive a data packet, where the data packet includes a preamble field and a data field, and the preamble field includes a legacy signaling field and an efficient signaling field;

a processing unit 502, configured to parse the data packet received by the transceiver unit, including: if the processing unit detects that the first cyclic redundancy check field in the preamble field is correct, the processing unit determines that the legacy signaling field is correctly transmitted, where the first cyclic redundancy check field is obtained by performing a cyclic redundancy check operation on a part of fields in the legacy signaling field by a sending station, and the part of fields in the legacy signaling field includes any one or any combination of the following fields: rate field, reserved bits, Length field.

Optionally, when a plurality of symbols exist in an efficient signaling field in a data packet received by the transceiver unit 501 and are coded independently, the first cyclic redundancy check field is located in a first symbol of the efficient signaling field, and if the processing unit 502 detects that the first cyclic redundancy check field and the second cyclic redundancy check field are correct, the processing unit 502 determines that the conventional signaling field is correctly transmitted.

It should be noted that, the processing unit 502 has been explained in detail in embodiment 4 according to the process of parsing the Length field in the conventional signaling field, and is not described herein again.

In the data packet transmission process of the wireless local area network, a receiving and transmitting unit receives a data packet, wherein the data packet comprises a preamble field and a data field, and the preamble field comprises a traditional signaling field and an efficient signaling field; the processing unit determines whether the traditional signaling field is correctly sent or not by analyzing different cyclic redundancy fields in the traditional signaling field, and the robustness of the check in the traditional signaling field is improved by the mode.

Example 9

Fig. 27 is a diagram showing a hardware configuration structure of a station in a wireless lan. In embodiment 9, station 600 may be implemented by bus 610 as a generic bus architecture, where bus 610 may include any number of interconnecting buses and bridges depending on the specific application of station 600 and the overall design constraints. A bus connects the various circuits including the processor 620, the storage medium 630, and the bus interface 640. The station 600 connects a network adapter 650 or the like to the station 600 via the bus 610 using the bus interface 640. The network adapter 310 may be used to implement signal processing functions of the physical layer in the wireless local area network and to implement transmission and reception of radio frequency signals through the antenna 670. The user interface 660 may connect user terminals, such as: keyboard, display, mouse, joystick, etc. The bus 610 may also connect various other circuits such as timing sources, peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described in detail.

Site 600 may be configured as a general purpose processing system including: one or more microprocessors providing processor functionality; and an external memory providing at least a portion of the storage medium 630, all connected together with other support circuitry via an external bus architecture. Alternatively, site 600 may be implemented using: an ASIC (application specific integrated circuit) having a processor 620, a bus interface 640, and a user interface 660; and at least a portion of the storage medium 630 integrated in a single chip, or the station 600 may be implemented using: one or more FPGAs (field programmable gate arrays), PLDs (programmable logic devices), controllers, state machines, gate logic, discrete hardware components, any other suitable circuitry, or any combination of circuitry capable of performing the various functions described throughout this disclosure.

The processor 620 is responsible for managing the bus and general processing (including executing software stored on the storage medium 630). Processor 620 can be implemented using one or more general-purpose processors and/or special-purpose processors. Examples of processors include microprocessors, microcontrollers, DSP processors, and other circuits capable of executing software. Software should be construed broadly to mean instructions, data, or any combination thereof, whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.

In the hardware implementation shown in fig. 27, the storage medium 630 is shown separate from the processor 620, however, one skilled in the art will readily appreciate that the storage medium 630, or any portion thereof, may be located outside of the station 600. Storage medium 630 may include, for example, a transmission line, a carrier waveform modulated with data, and/or a computer product separate from the wireless node, all of which may be accessed by processor 620 via bus interface 640. Alternatively, the storage medium 630, or any portion thereof, may be integral to the processor 620, e.g., may be a cache and/or general purpose registers.

Specifically, the processor 620 can execute the instructions in fig. 11, and other instructions executed by the processor 620 have been described in detail in embodiment 1, and are not described again.

Example 10

Fig. 27 is a diagram showing a hardware configuration structure of a station in a wireless lan. In embodiment 10, the hardware configuration structure of the station is the same as that in embodiment 9, and is not described again.

Specifically, the processor 620 in the station in embodiment 10 can execute the instructions in fig. 20, and other instructions executed by the processor 620 have been described in detail in embodiment 2, and are not described again.

Example 11

Fig. 27 is a diagram showing a hardware configuration structure of a station in a wireless lan. In embodiment 11, the hardware configuration structure of the station is the same as that in embodiment 9, and is not described again.

Specifically, the processor 620 in the station in embodiment 11 can execute the instructions in fig. 21, and other instructions executed by the processor 620 have been described in detail in embodiment 3, and are not described again.

Example 12

Fig. 27 is a diagram showing a hardware configuration structure of a station in a wireless lan. In embodiment 12, the hardware configuration structure of the station is the same as that in embodiment 9, and is not described again.

Specifically, the processor 620 in the station in embodiment 12 can execute the instructions in fig. 25, and other instructions executed by the processor 620 have been described in detail in embodiment 4, and are not described again.

It should be understood that, in various embodiments of the present invention, the sequence numbers of the above-mentioned processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

Those of ordinary skill in the art will appreciate that the elements and algorithm steps of the examples described in connection with the embodiments disclosed herein may be embodied in electronic hardware, computer software, or combinations of both, and that the components and steps of the examples have been described in a functional general in the foregoing description for the purpose of illustrating clearly the interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.

It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not 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 apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or 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 units, and may also be an electric, mechanical or other form of connection.

The units described as separate parts may or may not be physically separate, and parts displayed as units 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 units can be selected according to actual needs to achieve the purpose of the solution of the embodiment of the present invention.

In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit. Specifically, the hardware implementation may be implemented by software and necessary general hardware, where the general hardware includes a general Integrated Circuit, a general CPU (Central Processing Unit, chinese), a general Digital Signal Processor (DSP), a Field Programmable Gate Array (FPGA), a Programmable Logic Device (PLD), a general memory, general components, and the like, and the hardware implementation may also be implemented by special hardware including A Special Integrated Circuit (ASIC), a special CPU, a special memory, special components, and the like.

The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention essentially or partially contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.

Software or instructions may also be transmitted over a transmission medium. For example, if the software is transmitted from a website, server, or other remote source using a coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), or wireless technologies such as infrared, radio, and microwave, then the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of transmission medium.

While the invention has been described with reference to specific embodiments, the invention is not limited thereto, and various equivalent modifications and substitutions can be easily made by those skilled in the art within the technical scope of the invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

It should be noted that the foregoing example 2 also includes at least the following embodiments.

In step 201 of embodiment 2, it is mentioned that the first crc field is obtained by the sending station performing a crc operation on a part of fields in the legacy signaling field, where the part of fields in the legacy signaling field includes any one or any combination of the following fields: rate field, reserved bits, Length field.

In the foregoing embodiment, it is mentioned that the generation of the first crc field may be further performed by the sending station performing a crc operation on a part of bits of the Rate field, and the generation of the first crc field may be further performed by the sending station performing a crc operation on a part of bits of the Length field.

Optionally, as another embodiment, the first cyclic redundancy check field is located in a part of bits in the legacy signaling field.

Specifically, the first cyclic redundancy check field is located in a partial bit of a Length field in the legacy signaling field.

Illustratively, as shown in fig. 28, in this embodiment, the transmitting station performs cyclic redundancy on the upper 10 bits of the Length field in the conventional signaling field to obtain 2-bit check bits, and replaces the lower 2 bits of the Length field with the 2-bit check bits. It should be noted that replacing the lower 2 bits of the Length field will affect the real value of the Length field, and the error value is 0-3. Since the error value is small, it is within the error allowable range of the receiving station.

Optionally, the sending station performs parity check on the replaced Length field, Rate field and reserved bits, and the parity check bits are stored in the parity check bits of the conventional signaling field.

In addition to the foregoing embodiment, the sending station may also perform cyclic redundancy on the high 11 bits of the Length field to obtain 1-bit check bits, and replace the low 1bit of the Length field with the 1-bit check bits, which is not limited in the present invention.

Specifically, the first cyclic redundancy check field is located in a partial bit of a Rate field in the legacy signaling field.

Illustratively, as shown in fig. 29, in this embodiment, the transmitting station performs cyclic redundancy on the Length field in the conventional signaling field to obtain 2-bit check bits, and replaces the lower 2-bit bits of the Rate field with the 2-bit check bits. It should be noted that the value of the Rate field in the conventional signaling field is a fixed value, so that replacing the lower 2 bits of the Rate field does not affect the determination of the receiving station on the value of the Rate field.

In addition to the foregoing embodiment, the sending station may also perform cyclic redundancy on the Length field to obtain 1-bit check bit, and replace the lower 1-bit of the Rate field with the 1-bit check bit. The principle of replacing the lower 3 bits of the Rate field and replacing all the bits of the Rate field is similar and will not be described in detail.

In addition to the foregoing embodiments, the sending station may also perform cyclic redundancy on the Length field to obtain multiple parity bits, store one of the parity bits in the reserved bit, and store the remaining parity bits in the Rate field.

In addition to the foregoing embodiments, the sending station may also perform cyclic redundancy on the Length field to obtain multiple check bits, store one of the check bits in the reserved bit, and store the remaining check bits in the Length field.

Optionally, the sending station performs parity check on the Length field, the replaced Rate field and the reserved bits, and the parity check bits are stored in the parity check bits of the conventional signaling field.

In the embodiment of the invention, the sending station sends the data packet in the data packet transmission process of the wireless local area network, and the sending station utilizes part of bits in the traditional signaling field in the data packet to carry the cyclic redundancy check field, so that the correct sending of the traditional signaling field can be ensured, and the check robustness in the traditional signaling field is improved.

It should be noted that the foregoing example 4 at least includes the following embodiments.

Specifically, in step 402 of embodiment 4, it is mentioned that the receiving station detects that a first cyclic redundancy check field in the preamble field is correct, and then the receiving station determines that the conventional signaling field is correctly transmitted, where the first cyclic redundancy check field is obtained by performing a cyclic redundancy check operation on a partial field in the conventional signaling field by a sending station, and the partial field in the conventional signaling field includes any one or any combination of the following fields: rate field, reserved bits, Length field.

Specifically, the first crc field is located in a partial bit of a Length field in the legacy signaling field, and if the receiving station detects the first crc field correctly, the receiving station determines that the legacy signaling field is correctly transmitted.

For example, as shown in fig. 28, in this embodiment, the receiving station detects the low-order 2-bit check bits of the Length field in the conventional signaling field, and if the detection is correct, it is determined that the conventional signaling field is correctly transmitted. It should be noted that, because the sending station replaces the lower 2 bits of the Length field, the true value of the Length field is affected, and the error value is 0-3. Since the error value is small, it is within the error allowable range of the receiving station.

In addition to the foregoing embodiment, for the situation that the transmitting station performs cyclic redundancy on the high 11 bits of the Length field to obtain the 1-bit check bit, the receiving station detects the low 1-bit check bit of the Length field, and if the detection is correct, determines that the conventional signaling field is correctly transmitted.

Specifically, the first crc field is located in a partial bit of a Rate field in the legacy signaling field, and if the receiving station detects the first crc field correctly, the receiving station determines that the legacy signaling field is correctly transmitted.

For example, as shown in fig. 29, in this embodiment, the receiving station detects the low 2-bit check bits of the Rate field in the conventional signaling field, and if the detection is correct, it is determined that the conventional signaling field is correctly transmitted. It should be noted that the value of the Rate field in the conventional signaling field is a fixed value, so that replacing the lower 2 bits of the Rate field does not affect the determination of the receiving station on the value of the Rate field.

In addition to the foregoing embodiments, for the situation that the transmitting station performs cyclic redundancy on the Length field to obtain 1-bit check bits, the receiving station detects the low-bit check bits of the Rate field, and if the detection is correct, determines that the conventional signaling field is correctly transmitted. The principle of detecting the lower 3 bits of the Rate field and detecting all the bits of the Rate field is similar and will not be described in detail.

Optionally, before the receiving station detects the first crc field, the receiving station detects a parity bit in the conventional signaling field, where the parity bit is obtained by performing parity check on the Length field, the Rate field, and the reserved bit by the sending station.

In the embodiment of the invention, in the data packet transmission process of the wireless local area network, the receiving station analyzes the data packet, and determines whether the traditional signaling field is correctly transmitted or not by detecting the low-order bit in the traditional signaling field in the data packet, thereby improving the robustness of the verification in the traditional signaling field.

The above-mentioned scheme can be applied to the apparatuses and methods mentioned in the foregoing embodiments, for example, the process of generating the data packet is implemented by a processing unit or a processor, and the process of transmitting and receiving is implemented by a transceiver. Those skilled in the art will also understand that details of the above-described extended embodiments and the foregoing embodiments may be combined in a complex logic, and further details of other extensions will not be described herein.

Claims

1. A data packet transmission method applied to a wireless local area network WLAN, comprising:

2. The method of claim 1, wherein the preamble field further comprises a first cyclic redundancy check field, and wherein the first cyclic redundancy check field is obtained by performing a cyclic redundancy check operation on a partial field in the legacy signaling field by the sending station, and wherein the partial field in the legacy signaling field comprises any one or any combination of a Rate field, a reserved bit, and a Length field.

3. The method of claim 2, wherein the first cyclic redundancy check field is located in a reserved bit of the legacy signaling field.

4. The method of claim 2, wherein the preamble field further comprises a second cyclic redundancy check field, wherein the first cyclic redundancy check field is located in the efficient signaling field, and wherein the second cyclic redundancy check field is generated by the transmitting station performing a cyclic redundancy check on a field of the efficient signaling field other than the first cyclic redundancy check field.

5. The method of claim 2, wherein the preamble field further comprises a second cyclic redundancy check field, and wherein the second cyclic redundancy check field is obtained by performing a cyclic redundancy check operation on the first cyclic redundancy check field and other fields of the high efficiency signaling field at the transmitting station, and wherein the first cyclic redundancy check field is located in the high efficiency signaling field.

6. The method of claim 4 or 5, wherein the first cyclic redundancy check field is located in a first symbol of the efficient signaling field when the efficient signaling field has multiple symbols and is independently encoded.

7. The method of claim 1, wherein the preamble field further comprises a third cyclic redundancy check field, and wherein the third cyclic redundancy check field is obtained by performing a cyclic redundancy check on a partial field in the legacy signaling field and the high efficiency signaling field by the sending station, and wherein the partial field in the legacy signaling field comprises any one or any combination of a Rate field, a reserved bit, and a Length field.

8. A method for transmitting data packets for a wireless local area network WLAN, characterized in that the method has all the features of any one of claims 1 to 7, and the first indication value is located in a Length field of the legacy signaling field, the first indication value is calculated by the transmitting station according to the packet structure of 802.11a and the lowest data transmission rate according to the transmission duration of the data packet, and the first indication value is a multiple of 3.

9. A method for transmitting data packets for a wireless local area network WLAN, characterized in that it has all the features of any one of claims 1 to 8, and in that the Length field carries a second indication of an even number, in particular a Length field with the lowest bit of 0.

10. A method of data packet transmission applied to a wireless local area network WLAN, characterized in that it has all the features of any one of claims 1 to 9 and in that said legacy signalling field also comprises parity bits.

11. A data packet transmission method applied to a wireless local area network WLAN, comprising:

a sending station generates a data packet, wherein the data packet comprises a preamble field and a data field, the preamble field comprises a traditional signaling field and an efficient signaling field, a first cyclic redundancy check field is located in the preamble field, the first cyclic redundancy check field is obtained by the sending station performing cyclic redundancy check operation on part of fields in the traditional signaling field, and the part of fields in the traditional signaling field comprises any one or any combination of a Rate field, reserved bits and a Length field; a Length field in the conventional signaling field carries a second indication value, the second indication value is obtained by processing a first indication value by the sending station, the first indication value is used for indicating the sending duration of the data packet, and the second indication value is an even number and is not a multiple of 3;

12. The method of claim 11, wherein the first cyclic redundancy check field is located in a reserved bit of the legacy signaling field.

13. The method of claim 11, wherein the preamble field further comprises a second cyclic redundancy check field, wherein the first cyclic redundancy check field is located in the efficient signaling field, and wherein the second cyclic redundancy check field is generated by the transmitting station performing a cyclic redundancy check on a field of the efficient signaling field other than the first cyclic redundancy check field.

14. The method of claim 11, wherein the preamble field further comprises a second cyclic redundancy check field, wherein the first cyclic redundancy check field is located in the high efficiency signaling field, and wherein the second cyclic redundancy check field is obtained by performing a cyclic redundancy check operation on the first cyclic redundancy check field and other fields of the high efficiency signaling field by the transmitting station.

15. The method of claim 13 or 14, wherein the first cyclic redundancy check field is located at a first symbol of the efficient signaling field when the efficient signaling field has multiple symbols and is independently encoded.

16. A data packet transmission method applied to a wireless local area network WLAN, comprising:

17. The method of claim 16, wherein the receiving station parsing the data packet further comprises:

the first cyclic redundancy check field is obtained by the sending station performing cyclic redundancy check operation on a part of fields in the traditional signaling field, and the part of fields in the traditional signaling field comprises any one or any combination of a Rate field, reserved bits and a Length field.

18. The method of claim 17, wherein the first crc field is located in a reserved bit of the legacy signaling field, and wherein the receiving station determines that the legacy signaling field is correctly transmitted if the receiving station detects a correct crc field.

19. The method of claim 17, wherein the preamble field further comprises a second cyclic redundancy check field, wherein the first cyclic redundancy check field is located in the high efficiency signaling field, and wherein the second cyclic redundancy check field is obtained by the sending station performing a cyclic redundancy check operation on a field of the high efficiency signaling field other than the first cyclic redundancy check field,

20. The method of claim 17, wherein the preamble field further comprises a second cyclic redundancy check field, wherein the first cyclic redundancy check field is located in the efficient signaling field, and wherein the second cyclic redundancy check field is obtained by performing a cyclic redundancy check operation on the first cyclic redundancy check field and other fields of the efficient signaling field by the sending station,

21. The method of claim 19 or 20, wherein the first cyclic redundancy check field is located at a first symbol of the efficient signaling field when the efficient signaling field has multiple symbols and is independently coded,

22. The method of claim 16, wherein the receiving station parsing the data packet further comprises:

the third cyclic redundancy check field is obtained by the sending station performing cyclic redundancy check on a part of fields in the traditional signaling field and the efficient signaling field, and the part of fields in the traditional signaling field comprises any one or any combination of a Rate field, reserved bits and a Length field.

23. A method for transmitting data packets for a wireless local area network WLAN, the method having all the features of any one of claims 16 to 22, wherein the first indicator value is located in a Length field of the legacy signaling field, the first indicator value is calculated by the transmitting station according to the packet structure of 802.11a and the lowest data transmission rate according to the transmission duration of the data packet, and the first indicator value is a multiple of 3.

24. A method of data packet transmission for use in a wireless local area network, WLAN, the method having all the features of the method of any one of claims 16 to 23, and the parsing of the data packet by the receiving station further comprising:

25. A data packet transmission method applied to a wireless local area network WLAN, comprising:

the receiving station parsing the data packet, including: the receiving station determines that the conventional signaling field is correctly transmitted if the receiving station detects a first cyclic redundancy check field in the preamble field correctly, wherein the first cyclic redundancy check field is obtained by a sending station performing cyclic redundancy check operation on a part of fields in the conventional signaling field, the part of fields in the conventional signaling field includes any one or any combination of a Rate field, a reserved bit and a Length field, wherein the Length field in the conventional signaling field carries a second indication value, the second indication value is obtained by processing a first indication value by the sending station, the first indication value is used for indicating the transmission duration of the data packet, and the second indication value is an even number and is not a multiple of 3.

26. The method of claim 25, wherein the first crc field is located in a reserved bit of the legacy signaling field, and wherein the receiving station determines that the legacy signaling field is correctly transmitted if the receiving station detects a correct crc field.

27. The method of claim 25, wherein the preamble field further comprises a second cyclic redundancy check field, wherein the first cyclic redundancy check field is located in the high efficiency signaling field, and wherein the second cyclic redundancy check field is obtained by the sending station performing a cyclic redundancy check operation on a field of the high efficiency signaling field other than the first cyclic redundancy check field,

28. The method of claim 25, wherein the preamble field further comprises a second cyclic redundancy check field, wherein the first cyclic redundancy check field is located in the efficient signaling field, and wherein the second cyclic redundancy check field is obtained by performing a cyclic redundancy check operation on the first cyclic redundancy check field and other fields of the efficient signaling field by the sending station,

29. The method of claim 27 or 28, wherein the first cyclic redundancy check field is located at a first symbol of the efficient signaling field when the efficient signaling field has multiple symbols and is independently coded,

30. A data transmission apparatus for a wireless local area network WLAN, comprising:

31. The apparatus of claim 30, wherein the preamble field in the data packet generated by the processing unit further comprises a first cyclic redundancy check field, and the first cyclic redundancy check field is obtained by performing a cyclic redundancy check operation on a partial field in the legacy signaling field by the processing unit, and the partial field in the legacy signaling field comprises any one or any combination of a Rate field, reserved bits, and a Length field.

32. The apparatus of claim 31, wherein a first cyclic redundancy check field in the data packet generated by the processing unit is located in a reserved bit of the legacy signaling field.

33. The apparatus of claim 31, wherein the preamble field in the data packet generated by the processing unit further comprises a second cyclic redundancy check field, wherein the first cyclic redundancy check field is located in the efficient signaling field, and wherein the second cyclic redundancy check field is generated by the processing unit performing a cyclic redundancy check on a field of the efficient signaling field other than the first cyclic redundancy check field.

34. The apparatus of claim 31, wherein the preamble field of the data packet generated by the processing unit further comprises a second cyclic redundancy check field, and wherein the second cyclic redundancy check field is obtained by the processing unit performing a cyclic redundancy check operation on the first cyclic redundancy check field and other fields of the high efficiency signaling field, and wherein the first cyclic redundancy check field is located in the high efficiency signaling field.

35. The apparatus of claim 33 or 34, wherein the first cyclic redundancy check field is located in a first symbol of the high efficiency signaling field when the high efficiency signaling field in the data packet generated by the processing unit has multiple symbols and is independently encoded.

36. The apparatus of claim 30, wherein the preamble field in the data packet generated by the processing unit further comprises a third cyclic redundancy check field, and the third cyclic redundancy check field is obtained by the processing unit performing a cyclic redundancy check on a partial field in the legacy signaling field and the efficient signaling field, and the partial field in the legacy signaling field comprises any one or any combination of a Rate field, reserved bits, and a Length field.

37. A data transmission apparatus for a wireless local area network WLAN, the apparatus having all the features of the apparatus in any one of claims 30 to 36, wherein a first indication value in a data packet generated by the processing unit is located in a Length field in the legacy signaling field, the first indication value is calculated by the processing unit according to a transmission duration of the data packet, according to a packet structure of 802.11a and a lowest data transmission rate, and the first indication value is a multiple of 3.

38. A data transmission apparatus applied to a wireless local area network WLAN, wherein the apparatus has all the features of the apparatus of any one of claims 30 to 37, and a Length field in a data packet generated by the processing unit carries a second indication value of an even number, and specifically, the lowest bit of the Length field is 0.

39. A data transmission apparatus for use in a wireless local area network, WLAN, the apparatus having all the features of the apparatus of any one of claims 30 to 38, wherein the legacy signalling field in the data packet generated by the processing unit further comprises parity bits.

40. A data transmission apparatus for a wireless local area network WLAN, comprising:

a processing unit, configured to generate a data packet, where the data packet includes a preamble field and a data field, the preamble field includes a legacy signaling field and an efficient signaling field, a first cyclic redundancy check field is located in the preamble field, and the first cyclic redundancy check field is obtained by performing a cyclic redundancy check operation on a part of the legacy signaling field by the processing unit, and the part of the legacy signaling field includes any one or any combination of a Rate field, a reserved bit, and a Length field, where a Length field in the legacy signaling field carries a second indication value, the second indication value is obtained by processing a first indication value by the sending station, the first indication value is used to indicate a sending duration of the data packet, and the second indication value is an even number and is not a multiple of 3;

41. The apparatus of claim 40, wherein a first cyclic redundancy check field in the data packet generated by the processing unit is located in a reserved bit of the legacy signaling field.

42. The apparatus of claim 40, wherein the preamble field in the data packet generated by the processing unit further comprises a second cyclic redundancy check field, wherein the first cyclic redundancy check field is located in the efficient signaling field, and wherein the second cyclic redundancy check field is generated by the processing unit performing a cyclic redundancy check on a field of the efficient signaling field other than the first cyclic redundancy check field.

43. The apparatus of claim 40, wherein the preamble field of the data packet generated by the processing unit further comprises a second cyclic redundancy check field, wherein the first cyclic redundancy check field is located in the efficient signaling field, and wherein the second cyclic redundancy check field is obtained by performing a cyclic redundancy check operation on the first cyclic redundancy check field and other fields of the efficient signaling field by the processing unit.

44. The apparatus of claim 42 or 43, the first cyclic redundancy check field is located in a first symbol of an efficient signaling field in a data packet generated by the processing unit when the efficient signaling field has multiple symbols and is independently encoded.

45. A data transmission apparatus for a wireless local area network WLAN, comprising:

46. The apparatus as claimed in claim 45, wherein said processing unit parsing the data packets received by said transceiving unit further comprises:

47. The apparatus of claim 46, wherein a first cyclic redundancy check field in the data packet received by the transceiving unit is located in a reserved bit of the legacy signaling field, and wherein the processing unit determines that the legacy signaling field is correctly transmitted if the processing unit detects that the first cyclic redundancy check field is correct.

48. The apparatus as claimed in claim 46, wherein the preamble field of the data packet received by the transceiving unit further comprises a second cyclic redundancy check field, wherein the first cyclic redundancy check field is located in the high efficiency signaling field, and wherein the second cyclic redundancy check field is obtained by the transmitting station performing a cyclic redundancy check operation on fields of the high efficiency signaling field other than the first cyclic redundancy check field,

49. The apparatus of claim 46, wherein a preamble field of the data packet received by the transceiver unit further comprises a second cyclic redundancy check field, wherein the first cyclic redundancy check field is located in the high efficiency signaling field, and wherein the second cyclic redundancy check field is obtained by the transmitting station performing a cyclic redundancy check operation on the first cyclic redundancy check field and other fields of the high efficiency signaling field,

50. The apparatus according to claim 48 or 49, wherein the first cyclic redundancy check field is located in a first symbol of the high efficiency signaling field when the high efficiency signaling field in the data packet received by the transceiving unit has multiple symbols and is independently coded,

51. The apparatus as claimed in claim 45, wherein said processing unit parsing the data packets received by said transceiving unit further comprises:

52. A data transmission apparatus for a WLAN, wherein the apparatus has all the features of the apparatus in any one of claims 45 to 51, and wherein a first indication value in a data packet received by the transceiving unit is located in a Length field in the legacy signaling field, the first indication value is calculated by the transmitting station according to a transmission duration of the data packet, according to a packet structure of 802.11a and a lowest data transmission rate, and the first indication value is a multiple of 3.

53. A data transmission apparatus for a Wireless Local Area Network (WLAN), wherein the apparatus has all the features of the apparatus of any one of claims 45 to 52, and wherein the processing unit parses the data packets received by the transceiving unit further comprises:

54. A data transmission apparatus for a wireless local area network WLAN, comprising:

a processing unit, configured to parse the data packet received by the transceiver unit, including: the processing unit determines that the conventional signaling field is correctly transmitted if the processing unit detects that a first cyclic redundancy check field in the preamble field is correct, where the first cyclic redundancy check field is obtained by a sending station performing a cyclic redundancy check operation on a part of fields in the conventional signaling field, and the part of fields in the conventional signaling field includes any one or any combination of a Rate field, a reserved bit, and a Length field, where the Length field in the conventional signaling field carries a second indication value, the second indication value is obtained by processing a first indication value by the sending station, the first indication value is used to indicate the transmission duration of the data packet, and the second indication value is an even number and is not a multiple of 3.

55. The apparatus of claim 54, wherein a first cyclic redundancy check field in the data packet received by the transceiver unit is located in a reserved bit of the legacy signaling field, and wherein the processing unit determines that the legacy signaling field is correctly transmitted if the processing unit detects that the first cyclic redundancy check field is correct.

56. The apparatus of claim 54, wherein a preamble field of the data packet received by the transceiver unit further comprises a second cyclic redundancy check field, wherein the first cyclic redundancy check field is located in the high efficiency signaling field, and wherein the second cyclic redundancy check field is obtained by the sending station performing a cyclic redundancy check operation on a field of the high efficiency signaling field other than the first cyclic redundancy check field,

57. The apparatus of claim 54, wherein a preamble field of the data packet received by the transceiver unit further comprises a second cyclic redundancy check field, wherein the first cyclic redundancy check field is located in the efficient signaling field, and wherein the second cyclic redundancy check field is obtained by the transmitting station performing a cyclic redundancy check operation on the first cyclic redundancy check field and other fields of the efficient signaling field,

58. The apparatus according to claim 56 or 57, when multiple symbols are present and independently coded in an efficient signaling field in a data packet received by the transceiving unit, the first cyclic redundancy check field is located in a first symbol of the efficient signaling field,

59. A computer-readable storage medium, characterized in that it stores a computer program which, when executed by hardware, is capable of implementing the method of any one of claims 1 to 29.

60. A data transmission apparatus for a wireless local area network WLAN, the apparatus comprising a processor and a storage medium, wherein the storage medium stores a computer program, and the computer program is capable of implementing the method of any one of claims 1 to 29 when executed by the processor.