CN106612162B

CN106612162B - Interference detection method and device for wireless local area network

Info

Publication number: CN106612162B
Application number: CN201510690317.7A
Authority: CN
Inventors: 林伟; 朱俊; 刘乐
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2015-10-22
Filing date: 2015-10-22
Publication date: 2020-07-24
Anticipated expiration: 2035-10-22
Also published as: WO2017067435A1; CN106612162A

Abstract

The invention discloses an interference detection method and device for a wireless local area network, wherein the method comprises the following steps: when a target high-efficiency signaling field BHE-SIG-B is transmitted in a first Basic Service Set (BSS), determining the energy of a signal carried by a null subcarrier on a non-primary channel of the first BSS, wherein the frequency bands occupied by the first BSS and a second BSS are at least partially overlapped, and a null subcarrier position pattern configured by the first BSS is different from a null subcarrier position pattern configured by the second BSS; and determining the interference suffered by the transmission process of the target HE-SIG-B according to the energy of the signal carried by the empty subcarrier on the non-primary channel of the first BSS. The embodiment of the invention solves the problem that interference detection can not be carried out in the transmission process of the HE-SIG-B.

Description

Interference detection method and device for wireless local area network

Technical Field

The embodiment of the invention relates to the field of communication, in particular to an interference detection method and device for a wireless local area network.

Background

In the prior art, a Wireless L o' clock Area Networks (W L AN) widely adopts AN Orthogonal Frequency Division Multiplexing (OFDM) technique, OFDM is a multi-carrier technique, in which a channel is first divided into a plurality of Orthogonal sub-channels, a high-speed data stream is converted into parallel low-speed sub-streams, and the low-speed sub-streams are modulated onto each sub-channel for transmission.

The bandwidth of the W L AN channel is increasing, and gradually extends from AN initial channel supporting only 20M to a channel supporting 40M, 60M, and 80M, a channel greater than 20M, such as a 40M channel or AN 80M channel, may be composed of a Primary20M channel (Primary20M channel) and a non-Primary 20M channel (Secondary 20M channel, Worst 20M channel, etc.).

The W L AN introduces the concept of Basic Service Set (BSS), the BSS is generally composed of AN AP and a Station (Station, STA). the transmission of packet data between the AP and the STA is carried out according to a frame format of a certain protocol.FIG. 1 is a schematic diagram of a physical layer packet structure of AN 802.11ax protocol, as shown in FIG. 1, a Preamble part of the physical layer packet structure of the 802.11ax protocol comprises a legacy Preamble (L aggregation) and a High Efficiency (HE) Preamble, the legacy Preamble comprises a short Training Field (L aggregation Training Field, L-STF), a long Training Field (L aggregation L ong Training Field, L-L TF), a signaling Field (L aggregation Field, L-SIG), the High efficiency Preamble comprises a High efficiency signaling Field A (High aggregation Training Field A, SIG-SIG), a High efficiency signaling Field B-L HE, etc., the short Training Field (L aggregation) and the High Efficiency (HE) Preamble.

In the frame structure shown in fig. 1, HE-SIG-a and HE-SIG-B are sent to all STAs in a broadcast manner, where OFDM symbols of HE-SIG-a and HE-SIG-B use subcarrier bandwidths of 312.5KHz, and correspond to 64, 128, 256, and 512 subcarriers for channels with bandwidths of 20MHz, 40MHz, 80MHz, and 160MHz, respectively, where the OFDM symbols with a bandwidth of 20MHz include 48 or 52 data subcarriers for transmitting corresponding signaling information, HE-SIG-a and HE-SIG-B are used for transmitting different types of physical layer signaling, HE-SIG-a carries information such as transmission bandwidth, number of symbols of HE-SIG-B, and Modulation and precoding Scheme (MCS) used, and HE-SIGB carries the number of symbols of HE-L TF, indication of resource allocation, identity indication of scheduled STAs, and corresponding transmission parameters, and the number of STAs scheduled is variable.

In general, during the transmission of the HE-SIGB, the AP transmits pilot signals using only the primary channel and does not transmit pilot signals in each non-primary channel. Thus, a plurality of null subcarriers appear at positions in each non-primary channel corresponding to the positions of the pilot signals in the primary channel. Specifically, taking the AP occupying the 40M channel as an example, referring to fig. 2, the sub-carriers of the-21, -7, and 21 of the primary20M channel are used for transmitting the pilot, and the sub-carriers of the-21, -7, and 21 of the non-primary 20M channel are null sub-carriers. In the prior art, whether the transmission process of the HE-SIG-B is interfered is judged by detecting the energy of the null sub-carriers.

However, in the OBSS scenario, since the channels occupied by different BSSs at least partially overlap, when HE-SIG-B is transmitted in one BSS, it may be interfered by another BSS. However, if another BSS is transmitting HE-SIG-B at the same time, since the positions of the null sub-carriers on the non-primary channels all correspond to the positions of the pilot signals on the primary channels, the positions of the null sub-carriers on the non-primary channels of the two BSSs interfering with each other may overlap, so that interference cannot be detected.

Disclosure of Invention

The embodiment of the invention provides an interference detection method and device for a wireless local area network, which aim to solve the problem that interference detection may not be carried out in the transmission process of HE-SIG-B.

In a first aspect, an interference detection method for a wireless local area network is provided, including: determining energy of signals carried by null subcarriers on non-primary channels of the first BSS, wherein frequency bands occupied by the first BSS and the second BSS are at least partially overlapped, and a null subcarrier position pattern configured by the first BSS is different from a null subcarrier position pattern configured by the second BSS, wherein a null subcarrier position pattern configured by one BSS is used for indicating a relative position of a null subcarrier on a non-primary channel of the one BSS in a transmission process of an HE-SIG-B; and determining the interference suffered by the transmission process of the target HE-SIG-B according to the energy of the signal carried by the empty subcarrier on the non-primary channel of the first BSS.

With reference to the first aspect, in an implementation manner of the first aspect, the null subcarrier position pattern configured by the first BSS and the null subcarrier position pattern configured by the second BSS are any two of N pre-configured null subcarrier position patterns, and the N null subcarrier position patterns are obtained by using a cyclic shift manner based on a reference position of a null subcarrier in a non-primary channel.

With reference to the first aspect or any one of the foregoing implementation manners of the first aspect, in another implementation manner of the first aspect, the N types of null subcarrier position patterns are obtained by respectively cyclically shifting null subcarriers at the reference position on both sides of a central direct current subcarrier.

With reference to the first aspect or any one of the above implementations of the first aspect, in another implementation of the first aspect, the reference position of the null subcarrier on the non-primary channel corresponds to a position of a pilot signal on the primary channel.

With reference to the first aspect or any one of the foregoing implementation manners of the first aspect, in another implementation manner of the first aspect, the target HE-SIG-B is transmitted through multiple symbols, and the first BSS configures different null subcarrier position patterns on at least two symbols of the multiple symbols.

In a second aspect, an interference detection apparatus for a wireless local area network is provided, including: a first determining module, configured to determine, when a target HE-SIG-B is transmitted in a first BSS, energy of a signal carried by a null subcarrier on a non-primary channel of the first BSS, where a frequency band occupied by the first BSS and a frequency band occupied by a second BSS overlap at least partially, and a null subcarrier position pattern configured by the first BSS is different from a null subcarrier position pattern configured by the second BSS, where a null subcarrier position pattern configured by one BSS is used to indicate a relative position of a null subcarrier on the non-primary channel of the one BSS in a transmission process of the HE-SIG-B; a second determining module, configured to determine, according to the energy of the signal carried by the empty subcarrier on the non-primary channel of the first BSS, interference suffered by the transmission process of the target HE-SIG-B.

With reference to the second aspect, in an implementation manner of the second aspect, the null subcarrier position pattern configured by the first BSS and the null subcarrier position pattern configured by the second BSS are any two of N pre-configured null subcarrier position patterns, and the N null subcarrier position patterns are obtained by using a cyclic shift manner based on a reference position of a null subcarrier in a non-primary channel.

With reference to the second aspect or any one of the foregoing implementation manners of the second aspect, in another implementation manner of the second aspect, the N types of null subcarrier position patterns are obtained by circularly shifting null subcarriers at the reference position on both sides of a central direct current subcarrier.

With reference to the second aspect or any one of the above implementations of the second aspect, in another implementation of the second aspect, the reference position of the null subcarrier on the non-primary channel corresponds to a position of a pilot signal on the primary channel.

With reference to the second aspect or any one of the foregoing implementations of the second aspect, in another implementation of the second aspect, the target HE-SIG-B is transmitted over multiple symbols, and the first BSS configures different null subcarrier position patterns on at least two of the multiple symbols.

In the embodiment of the invention, different empty subcarrier position patterns are configured for different BSSs, so that even if different BSSs transmit HE-SIG-B at the same time and in the same frequency band, the frequency domain positions of the empty subcarriers of the different BSSs are staggered, and the problem that interference detection cannot be carried out in the transmission process of the HE-SIG-B is avoided.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic diagram of the physical layer packet structure of the 802.11ax protocol.

Fig. 2 is a schematic diagram of a null subcarrier location pattern based on a 40M channel.

Fig. 3 is an exemplary diagram of an application scenario of the interference detection method according to the embodiment of the present invention.

Fig. 4 is a schematic flow diagram of an interference detection method according to an embodiment of the present invention.

Fig. 5 is a schematic diagram of a null subcarrier location pattern of non-primary channels of different BSSs in accordance with an embodiment of the present invention.

Fig. 6 is a schematic diagram of a null subcarrier location pattern of a non-primary channel of different BSSs in accordance with another embodiment of the present invention.

Fig. 7 is a schematic block diagram of an interference detection apparatus for a wireless local area network according to an embodiment of the present invention.

Fig. 8 is a schematic block diagram of an interference detection apparatus for a wireless local area network according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. 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.

It should be understood that the technical solution of the embodiment of the present invention can be applied to a communication system using unlicensed spectrum resources, such as a W L AN system.

It should also be understood that in the embodiments of the present invention, the AP is a network device that provides an access service. The STA is another end device that is accessed to the access point through a wireless network for communication, for example, a User Equipment (UE) may be referred to as a Terminal (Terminal), a Mobile Station (MS), a Mobile Terminal (Mobile Terminal), and the like, and the present invention is not limited thereto. However, for convenience of description, the following embodiments take the AP and the STA as examples.

For ease of understanding, a scenario in which the interference detection method according to the embodiment of the present invention may be adopted will be briefly described.

Fig. 3 is an exemplary diagram of an application scenario of the interference detection method according to the embodiment of the present invention. There are two BSSs, BSS1 and BSS2 in the scenario shown in fig. 3, wherein the frequency bands used by AP1 in BSS1 and AP2 in BSS2 for transmitting data partially overlap to form OBSS, STA1 belongs to BSS1, and STA2 belongs to BSS 2. When AP1 transmits HE-SIG-B to STA1, the transmission process of HE-SIG-B may be interfered with by AP2 because the channels used by AP1 and AP2 at least partially overlap.

Assuming that, in the process of transmitting HE-SIG-B1 to STA1 by BSS1, BSS2 transmits HE-SIG-B2 to STA2, if frequency bands of non-primary 20M channels configured by BSS1 and BSS2 overlap, which means that, in the process of transmitting HE-SIG-B, null subcarriers of BSS1 and BSS2 on the non-primary 20M channels overlap with each other, at this time, although transmission of HE-SIG-B2 may generate interference for transmission of HE-SIG-B1, signal interference generated by transmission of HE-SIG-B2 is not detected on the null subcarrier of BSS 1.

In order to detect interference in the above-described case, an interference detection method according to an embodiment of the present invention is described in detail below with reference to fig. 4.

Fig. 4 is a schematic flow diagram of an interference detection method according to an embodiment of the present invention. The method shown in fig. 4 may be performed by an AP or an STA, or may be performed by a device having an interference detection function in a third party. The method comprises the following steps:

s410, when a target high efficiency signaling field B HE-SIG-B is transmitted in a first basic service set BSS, determining energy of a signal carried by a null subcarrier on a non-primary channel of the first BSS, where frequency bands occupied by the first BSS and a second BSS overlap at least partially, and a null subcarrier position pattern configured by the first BSS is different from a null subcarrier position pattern configured by the second BSS, where a null subcarrier position pattern configured by one BSS is used to indicate a relative position of a null subcarrier on the non-primary channel of the one BSS during transmission of the HE-SIG-B.

It should be understood that the frequency bands occupied by the first BSS and the second BSS at least partially overlap; alternatively, the first BSS and the second BSS are adjacent BSSs; alternatively, the first BSS and the second BSS belong to the same OBSS.

The null subcarrier position pattern configured by one BSS may specifically refer to a relative position, or an arrangement manner, of a null subcarrier on a non-primary channel of the one BSS when the HE-SIG-B is transmitted in the one BSS.

The above-mentioned non-primary channel of the first BSS may refer to a non-primary 20M channel of the first BSS. The embodiment of the present invention mainly takes the primary channel and the non-primary channel as 20M channels as an example, that is, the primary20M channel and the non-primary 20M channel, but the bandwidth of the primary channel and the non-primary channel is not particularly limited in the embodiment of the present invention.

And S420, determining interference suffered by the transmission process of the target HE-SIG-B according to energy of signals carried by null subcarriers on the non-primary channel of the first BSS.

Specifically, when the energy of a signal carried by an empty subcarrier on a non-primary channel of a first BSS is higher than a threshold set by a receiving end, it may be determined that a transmission process of a target HE-SIG-B is interfered; when the energy of signals carried by empty subcarriers on a non-primary channel of the first BSS is lower than a threshold set by a receiving end, it may be determined that the transmission process of the target HE-SIG-B is not interfered.

In the embodiment of the invention, different empty subcarrier position patterns are configured for different BSSs, so that even if different BSSs transmit HE-SIG-B at the same time and the same frequency band, the frequency domain positions of the empty subcarriers are staggered, and the problem that the interference detection cannot be carried out in the prior art is avoided.

Optionally, as an embodiment, the null subcarrier position pattern configured by the first BSS and the null subcarrier position pattern configured by the second BSS are any two of N pre-configured null subcarrier position patterns, and the N null subcarrier position patterns are obtained by using a cyclic shift method based on a reference position of a null subcarrier in a non-primary channel.

It should be understood that the above cyclic shift may refer to cyclic shift in units of subcarriers in a frequency range of a non-primary channel.

It should be understood that the reference position is not particularly limited by the embodiment of the present invention, and the reference position may correspond to a position of a pilot signal on the primary channel. As shown in fig. 2, null subcarriers follow the positions of subcarriers-21, -7, and 21 at the reference position of the non-primary channel. Alternatively, the reference position may be a position of a null subcarrier obtained by adjusting a position of a pilot signal on the primary channel, for example, the reference position may be a position of a null subcarrier obtained by adjusting an interval between adjacent null subcarriers among null subcarriers corresponding to the pilot signal on the primary channel, and the number of null subcarrier position patterns obtained by cyclic shift may be increased by such adjustment. For example, the reference positions of the null sub-carriers in the non-primary channel are the positions of sub-carriers-21, -8, and 21.

Specifically, when the null subcarrier position pattern is configured for the BSS, different null subcarrier position patterns may be configured for different BSSs according to the BSS Color (i.e., the last 7 bits or the last 12 bits of the BSS ID).

Optionally, as an embodiment, the N types of null subcarrier position patterns may be obtained by respectively cyclically shifting null subcarriers at the reference position on both sides of a central dc subcarrier.

As shown in fig. 5, the subcarrier 0 is a central Direct Current (DC) subcarrier, and when the subcarrier-7 is cyclically shifted to-1, the subcarrier is cyclically shifted to the subcarrier-26 next time, that is, the cyclic shift is performed on both sides of the central DC subcarrier without crossing the central DC subcarrier, so that a total of 12 null subcarrier position patterns can be obtained by the cyclic shift.

Fig. 6 is a schematic diagram of a null subcarrier location pattern of a non-primary channel of different BSSs in accordance with another embodiment of the present invention. The position pattern of the null sub-carrier shown in fig. 6 is obtained by cyclically shifting both sides of the center dc sub-carrier (sub-carrier No. 0 in fig. 5) based on the frequency domain position of the changed pilot signal as a reference position. As can be seen from fig. 6, the reference position is obtained by shortening the number of subcarrier intervals between pilot signals from 13 to 12 on both sides of the central dc subcarrier, thereby obtaining 13 null subcarrier position patterns in total, and the 13 null subcarrier position patterns can correspond to 13 different BSSs at maximum.

Optionally, as an embodiment, the target HE-SIG-B is transmitted over a plurality of symbols, and the first BSS configures different null subcarrier position patterns on at least two symbols of the plurality of symbols.

For example, if the transmission target HE-SIG-B requires 2 OFDM symbol time lengths, the first BSS may be configured with the null subcarrier position pattern of the BSS1 shown in fig. 4 in the first OFDM symbol time length, and the null subcarrier position pattern of the BSS2 shown in fig. 4 in the second OFDM symbol time length, that is, the transmission target HE-SIG-B configures the first BSS with a combination of the null subcarrier position pattern of the BSS1 shown in fig. 4 and the null subcarrier position pattern of the BSS 2.

For another example, if the transmission target HE-SIG-B requires 2 OFDM symbol time lengths, the first BSS may be configured with the null subcarrier position pattern of the BSS1 shown in fig. 5 in the first OFDM symbol time length, and the null subcarrier position pattern of the BSS2 shown in fig. 5 in the second OFDM symbol time length, that is, the transmission target HE-SIG-B configures the first BSS with a combination of the null subcarrier position pattern of the BSS1 shown in fig. 5 and the null subcarrier position pattern of the BSS 2.

Based on the above embodiment, the combined null sub-carrier position pattern is configured for different BSSs, so as to satisfy interference control and frequency reuse in an dense OBSS-based scenario.

In addition, it should be noted that, when determining the interference suffered by the transmission process of the target HE-SIG-B, assuming that multiple OFDM symbols are required for transmitting the target HE-SIG-B, the energy of the signal carried by the empty subcarrier on the non-primary channel may be determined only in a few OFDM symbol times, so as to simplify the complexity of the interference detection method according to the embodiment of the present invention. For example, when the transmission target HE-SIG-B requires 3 OFDM symbol time lengths, the energy of the signal carried by the null subcarrier on the non-primary channel may be determined within the first 2 OFDM symbol times.

The interference detection method for the wireless local area network according to the embodiment of the present invention is described in detail above with reference to fig. 1 to 6, and the interference detection apparatus for the wireless local area network according to the embodiment of the present invention is described in detail below with reference to fig. 7 and 8. It should be understood that the apparatus shown in fig. 7 and 8 can implement the steps of fig. 4, and in order to avoid repetition, the detailed description is omitted here.

Fig. 7 is a schematic block diagram of an interference detection apparatus for a wireless local area network according to an embodiment of the present invention. The apparatus 700 shown in fig. 7 includes a first determination module 710 and a second determination module 720.

A first determining module 710, configured to determine, when a target HE-SIG-B is transmitted in a first BSS, energy of a signal carried by a null subcarrier on a non-primary channel of the first BSS, where frequency bands occupied by the first BSS and a second BSS overlap at least partially, and a null subcarrier position pattern configured by the first BSS is different from a null subcarrier position pattern configured by the second BSS, where a null subcarrier position pattern configured by one BSS is used to indicate a relative position of a null subcarrier on the non-primary channel of the one BSS in a transmission process of the HE-SIG-B;

a second determining module 720, configured to determine, according to the energy of the signal carried by the empty subcarrier on the non-primary channel of the first BSS, interference suffered by the transmission process of the target HE-SIG-B, where the energy is determined by the first determining module.

Optionally, as an embodiment, the N null subcarrier position patterns are obtained by respectively cyclically shifting the null subcarriers at the reference position on both sides of the central dc subcarrier.

Optionally, as an embodiment, the reference position of the null subcarrier on the non-primary channel corresponds to the position of the pilot signal on the primary channel.

Fig. 8 is a schematic block diagram of an interference detection apparatus for a wireless local area network according to an embodiment of the present invention. The apparatus 800 shown in fig. 8 comprises:

a memory 810 for storing a program;

a processor 820, configured to execute a program, where the processor 820 is specifically configured to determine, when a target HE-SIG-B is transmitted in a first BSS, energy of a signal carried by a null subcarrier on a non-primary channel of the first BSS, where frequency bands occupied by the first BSS and a second BSS overlap at least partially, and a null subcarrier position pattern configured by the first BSS is different from a null subcarrier position pattern configured by the second BSS, where a null subcarrier position pattern configured by one BSS is used to indicate a relative position of a null subcarrier on the non-primary channel of the one BSS during transmission of the HE-SIG-B; and determining the interference suffered by the transmission process of the target HE-SIG-B according to the energy of the signal carried by the empty subcarrier on the non-primary channel of the first BSS.

It should be understood that in the present embodiment, "B corresponding to a" means that B is associated with a, from which B can be determined. It should also be understood, however, that determining B from a does not mean determining B from a alone, but may also be determined from a and/or other information.

It should be understood that the term "and/or" herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B, may be expressed as: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

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 according to the function and the inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein can be implemented as electronic hardware, or combinations of computer software and electronic hardware. 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 clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working processes of the systems, apparatuses and units described above may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the several embodiments provided in this application, it should be understood that the disclosed system, apparatus, and method may be implemented in other ways. For example, the above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units into only one type of logical function may be implemented in another manner, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted or not implemented. 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 be in an electrical, mechanical or other form.

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.

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 may be integrated into one unit.

The functions, if implemented in the form of software functional units 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 may 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 perform 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.

While the invention has been described with reference to specific embodiments, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims

1. An interference detection method for a wireless local area network, comprising:

when a target high efficiency signaling field (B HE-SIG-B) is transmitted in a first Basic Service Set (BSS), determining energy of a signal carried by a null subcarrier on a non-primary channel of the first BSS, wherein a frequency band occupied by the first BSS and a frequency band occupied by a second BSS are at least partially overlapped, and a null subcarrier position pattern configured by the first BSS is different from a null subcarrier position pattern configured by the second BSS, wherein a null subcarrier position pattern configured by one BSS is used for indicating a relative position of a null subcarrier on the non-primary channel of the one BSS in a transmission process of the HE-SIG-B;

and determining the interference suffered by the transmission process of the target HE-SIG-B according to the energy of the signal carried by the empty subcarrier on the non-primary channel of the first BSS.

2. The method of claim 1, wherein the null subcarrier position patterns configured by the first BSS and the null subcarrier position patterns configured by the second BSS are any two of N pre-configured null subcarrier position patterns, and the N null subcarrier position patterns are obtained by cyclic shift based on a reference position of a null subcarrier in a non-primary channel.

3. The method of claim 2, wherein the N null subcarrier position patterns are obtained by cyclically shifting null subcarriers at the reference position on both sides of a central dc subcarrier.

4. A method according to claim 2 or 3, wherein the reference position of the null sub-carriers on the non-primary channel corresponds to the position of the pilot signal on the primary channel.

5. The method of claim 1, wherein the target HE-SIG-B is transmitted over a plurality of symbols, the first BSS configuring different null subcarrier position patterns on at least two of the plurality of symbols.

6. An interference detection apparatus for a wireless local area network, comprising:

a first determining module, configured to determine, when a target high efficiency signaling field B HE-SIG-B is transmitted in a first basic service set BSS, energy of a signal carried by a null subcarrier on a non-primary channel of the first BSS, where a frequency band occupied by the first BSS and a frequency band occupied by a second BSS overlap at least partially, and a null subcarrier position pattern configured by the first BSS is different from a null subcarrier position pattern configured by the second BSS, where a null subcarrier position pattern configured by one BSS is used to indicate a relative position of a null subcarrier on the non-primary channel of the one BSS in a transmission process of the HE-SIG-B;

a second determining module, configured to determine, according to the energy of the signal carried by the empty subcarrier on the non-primary channel of the first BSS, interference suffered by the transmission process of the target HE-SIG-B.

7. The apparatus of claim 6, wherein the null subcarrier position patterns configured by the first BSS and the null subcarrier position patterns configured by the second BSS are any two of N pre-configured null subcarrier position patterns, and the N null subcarrier position patterns are obtained by cyclic shift based on a reference position of a null subcarrier in a non-primary channel.

8. The apparatus of claim 7, wherein the N null subcarrier position patterns are obtained by cyclically shifting null subcarriers at the reference position on both sides of a central dc subcarrier.

9. The apparatus of claim 7 or 8, wherein the reference position of the null sub-carriers on the non-primary channel corresponds to the position of the pilot signal on the primary channel.

10. The apparatus of claim 6, wherein the target HE-SIG-B is transmitted over a plurality of symbols, the first BSS configuring different null subcarrier position patterns on at least two of the plurality of symbols.

11. The apparatus of any one of claims 6-8, wherein the apparatus is an access point or a station in the first BSS.