CN107852769B

CN107852769B - Link self-adaption method of W L AN and network equipment

Info

Publication number: CN107852769B
Application number: CN201580081538.2A
Authority: CN
Inventors: 于健; 杨讯
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2015-07-08
Filing date: 2015-07-08
Publication date: 2020-08-07
Anticipated expiration: 2035-07-08
Also published as: CN107852769A; WO2017004812A1

Abstract

A link self-adapting method of W L AN and network equipment can improve the flexibility of channel information measurement and provide accurate link self-adaptation for users.

Description

Link self-adaption method of W L AN and network equipment

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a link adaptation method for a W L AN and a network device.

Background

In a wireless communication system, channel information of a wireless channel generally changes with time due to the influence of factors such as path loss, fading, or noise. Link adaptation techniques have been introduced for this time-varying nature of the channel. The link adaptive technique refers to a behavior of a system to adaptively adjust a transmission parameter of the system according to currently acquired channel information, so as to overcome or adapt to an influence caused by current channel change. As can be seen from the basic principle of the link adaptation technology, the link adaptation technology mainly includes two aspects: on one hand, the acquisition of channel information, namely how to accurately and effectively acquire the current channel condition; on the other hand, the adjustment of transmission parameters, such as MCS (Modulation and Coding Scheme), transmission power, time-frequency resources, etc., is performed. Currently, link adaptation technology is favored by its excellent performance in improving spectrum utilization and data transmission rate, and has been successfully applied to various mobile communication systems, becoming one of the key technologies for improving system performance.

In the link adaptation process of the existing WiFi (Wireless-Fidelity) standard, the mode of the sounding PPDU used for measuring channel information is relatively single, however, with the introduction of new characteristics such as outdoor scenes, uplink multi-user transmission and the like in the next generation WiFi standard IEEE 802.11ax, the sounding PPDU in the single mode is difficult to adapt to different requirements of different application scenes, and thus, IEEE 802.11ax also puts higher requirements on the selection of the sounding PPDU in the link adaptation process.

Disclosure of Invention

The embodiment of the invention provides a link self-adaptation method of a W L AN and network equipment, which can improve the flexibility of channel information measurement and provide accurate link self-adaptation for users.

A first aspect of AN embodiment of the present invention provides a link adaptation method for a W L AN, including:

a first network device obtains a target channel information measurement result, wherein the target channel information measurement result is a measurement result obtained by measuring channel information according to a detection physical layer protocol data unit (PPDU) of a target mode;

and the first network equipment performs link self-adaptive adjustment according to the target channel information measurement result.

With reference to the first aspect of the embodiment of the present invention, in a first implementation manner of the first aspect of the embodiment of the present invention, the obtaining, by the first network device, a target channel information measurement result includes:

the first network equipment sends a first PPDU to second network equipment, wherein the first PPDU indicates that the second network equipment needs to send a detection PPDU, and the first PPDU also comprises a mode indication field, and the mode indication field is used for indicating the second network equipment to generate a detection PPDU in a target mode;

the first network device receives a second PPDU sent by the second network device, where the second PPDU is a detection PPDU of a target mode generated by the second network device according to the mode indication field;

and the first network equipment measures channel information by using the second PPDU to obtain the target channel information measurement result.

With reference to the first aspect of the embodiment of the present invention, in a second implementation manner of the first aspect of the embodiment of the present invention, the obtaining, by the first network device, a target channel information measurement result includes:

the first network equipment receives a PPDU sent by second network equipment; the PPDU indicates the second network equipment to actively send a channel information measurement result, and the PPDU further comprises a mode indication field, wherein the mode indication field is used for indicating a mode of a sounding PPDU used by the second network equipment to measure the channel information;

and the first network equipment determines a target channel information measurement result according to the mode indication field.

With reference to the first aspect of the embodiment of the present invention, and any one of the first to second implementation manners of the first aspect, in a third implementation manner of the first aspect of the embodiment of the present invention, the mode of the sounding PPDU includes at least one of bandwidth information of the sounding PPDU, whether the sounding PPDU adopts an indoor mode or an outdoor mode, fourier change order information of a long training field of the sounding PPDU, and guard interval information of the sounding PPDU.

With reference to the first implementation manner of the first aspect of the embodiment of the present invention, in a fourth implementation manner of the first aspect of the embodiment of the present invention, the mode of the sounding PPDU includes whether the sounding PPDU adopts an indoor mode or an outdoor mode;

when the mode indication field indicates that a second network device generates a sounding PPDU in an outdoor mode, the second PPDU is an enhanced sounding PPDU generated by the second network device according to the mode indication field;

wherein the enhanced sounding PPDU refers to a sounding PPDU having at least one of the following formats:

at least one symbol of a preamble of the sounding PPDU is partially or completely copied in a time domain or a frequency domain, a guard interval between partial or all symbols of the sounding PPDU is larger than a first preset value, a Modulation and Coding Scheme (MCS) of at least one symbol of the sounding PPDU meets a certain preset condition, and a Fourier change order of at least one symbol of the sounding PPDU is higher than a second preset value.

With reference to the first aspect of the present embodiment and any one of the first to fourth implementation manners of the first aspect, in a fifth implementation manner of the first aspect of the present embodiment, the channel information includes an extension delay of a channel and/or a delay between multiple users;

the first network device performing link adaptive adjustment according to the target channel information measurement result includes:

and the first network equipment performs self-adaptive adjustment of the guard interval according to the target channel information measurement result.

With reference to the first aspect of the embodiment of the present invention and any one of the first to fourth implementation manners of the first aspect, in a sixth implementation manner of the first aspect of the embodiment of the present invention, the channel information includes a signal-to-noise ratio SNR of the channel;

and the first network equipment carries out the self-adaptive adjustment of the modulation and coding strategy MCS according to the target channel information measurement result.

A second aspect of the embodiments of the present invention provides a link adaptation method for a W L AN, including:

the second network equipment receives a first PPDU sent by the first network equipment; the first PPDU indicates that the second network equipment needs to send a detection PPDU, and the first PPDU further comprises a mode indication field, wherein the mode indication field is used for indicating the second network equipment to generate the detection PPDU of the target mode;

the second network equipment generates a detection PPDU of a target mode according to the mode indication field;

and the second network equipment sends a second PPDU to the first network equipment, wherein the second PPDU is used for the first network equipment to measure channel information by using the second PPDU, obtain the target channel information measurement result and carry out link self-adaptive adjustment according to the target channel information measurement result.

With reference to the second aspect of the embodiment of the present invention, in a first implementation manner of the second aspect of the embodiment of the present invention, the mode of the sounding PPDU includes at least one of bandwidth information of the sounding PPDU, whether the sounding PPDU adopts an indoor mode or an outdoor mode, fourier change order information of a long training field of the sounding PPDU, and guard interval information of the sounding PPDU.

With reference to the second aspect of the embodiment of the present invention, in a second implementation manner of the second aspect of the embodiment of the present invention, the mode of the sounding PPDU includes whether the sounding PPDU adopts an indoor mode or an outdoor mode;

when the mode indication field indicates that the second network device generates the sounding PPDU in the outdoor mode, the second network device generating the sounding PPDU in the target mode according to the mode indication field includes:

the second network equipment generates an enhanced detection PPDU according to the mode indication field;

With reference to the second aspect of the present embodiment and any one of the first to second implementation manners of the second aspect, in a third implementation manner of the second aspect of the present embodiment, the channel information includes a spreading delay of a channel and/or a delay between multiple users;

and the second PPDU is used for the first network equipment to measure the extended delay of the channel and/or the delay among multiple users by using the second PPDU, and the self-adaptive adjustment of the guard interval is carried out according to the measured extended delay of the channel and/or the delay among multiple users.

With reference to the second aspect of the embodiment of the present invention and any one of the first to second implementation manners of the second aspect, in a fourth implementation manner of the second aspect of the embodiment of the present invention,

and the second PPDU is used for the first network equipment to measure the SNR of the channel by using the second PPDU, and the self-adaptive adjustment of the MCS is carried out according to the measured SNR of the channel.

A third aspect of AN embodiment of the present invention provides a link adaptation method for a W L AN, including:

the second network equipment generates a PPDU; the PPDU indicates the second network equipment to actively send a channel information measurement result, and the PPDU further comprises a mode indication field, wherein the mode indication field is used for indicating a mode of a sounding PPDU used by the second network equipment to measure the channel information;

and the second network equipment sends the PPDU to the first network equipment, wherein the PPDU is used for the first network equipment to determine a target channel information measurement result according to the mode indication field and to perform link self-adaptive adjustment according to the target channel information measurement result.

With reference to the third aspect of the embodiment of the present invention, in a first implementation manner of the third aspect of the embodiment of the present invention, the mode of the sounding PPDU includes at least one of bandwidth information of the sounding PPDU, whether the sounding PPDU adopts an indoor mode or an outdoor mode, fourier change order information of a long training field of the sounding PPDU, and guard interval information of the sounding PPDU.

With reference to the third aspect of the present embodiment or the first implementation manner of the third aspect, in a second implementation manner of the third aspect of the present embodiment, the channel information includes an extension delay of a channel and/or a delay between multiple users;

and the PPDU is used for the first network equipment to determine a target channel information measurement result according to the mode indication field and to perform self-adaptive adjustment of a guard interval according to the target channel information measurement result.

With reference to the third aspect of the embodiment of the present invention or the first implementation manner of the third aspect, in a third implementation manner of the third aspect of the embodiment of the present invention, the channel information includes a signal-to-noise ratio SNR of the channel;

and the PPDU is used for the first network equipment to determine a target channel information measurement result according to the mode indication field and to perform adaptive adjustment of MCS according to the target channel information measurement result.

A fourth aspect of the embodiments of the present invention provides a network device, including:

an obtaining unit, configured to obtain a target channel information measurement result, where the target channel information measurement result is a measurement result obtained by measuring channel information according to a detection physical layer protocol data unit PPDU in a target mode;

and the adjusting unit is used for carrying out link self-adaptive adjustment according to the target channel information measurement result.

With reference to the fourth aspect of the embodiment of the present invention, in a first implementation manner of the fourth aspect of the embodiment of the present invention, the obtaining unit includes:

a sending module, configured to send a first PPDU to a target network device, where the first PPDU indicates that the target network device needs to send a probe PPDU, and the first PPDU further includes a mode indication field, where the mode indication field is used to indicate the target network device to generate a probe PPDU in a target mode;

a first receiving module, configured to receive a second PPDU sent by the target network device, where the second PPDU is a sounding PPDU of a target mode generated by the target network device according to the mode indication field;

and the first acquisition module is used for measuring the channel information by using the second PPDU to obtain the target channel information measurement result.

With reference to the fourth aspect of the embodiment of the present invention, in a second implementation manner of the fourth aspect of the embodiment of the present invention, the obtaining unit includes:

the second receiving module is used for receiving the PPDU sent by the target network equipment; the PPDU indicates a target network device to actively send a channel information measurement result, and the PPDU further comprises a mode indication field, wherein the mode indication field is used for indicating a mode of a detection PPDU used by the target network device to measure the channel information;

and the second acquisition module is used for determining a target channel information measurement result according to the mode indication field.

With reference to the fourth aspect of the embodiment of the present invention and any one of the first to second implementation manners of the fourth aspect, in a third implementation manner of the fourth aspect of the embodiment of the present invention, the mode of the sounding PPDU includes at least one of bandwidth information of the sounding PPDU, whether the sounding PPDU adopts an indoor mode or an outdoor mode, fourier change order information of a long training field of the sounding PPDU, and guard interval information of the sounding PPDU.

With reference to the first implementation manner of the fourth aspect of the embodiment of the present invention, in the fourth implementation manner of the fourth aspect of the embodiment of the present invention, the mode of the sounding PPDU includes whether the sounding PPDU adopts an indoor mode or an outdoor mode;

when the mode indication field indicates that the target network equipment generates the detection PPDU in the outdoor mode, the second PPDU is an enhanced detection PPDU generated by the target network equipment according to the mode indication field;

With reference to the fourth aspect of the present invention and any one of the first to fourth implementation manners of the fourth aspect, in a fifth implementation manner of the fourth aspect of the present invention, the channel information includes a spreading delay of a channel and/or a delay between multiple users;

the adjusting unit is specifically configured to perform adaptive adjustment of a guard interval according to the target channel information measurement result.

With reference to the fourth aspect of the present embodiment and any one of the first to fourth implementation manners of the fourth aspect, in a sixth implementation manner of the fourth aspect of the present embodiment, the channel information includes an SNR of a channel;

the adjusting unit is specifically configured to perform adaptive adjustment of a Modulation and Coding Scheme (MCS) according to the target channel information measurement result.

A fifth aspect of an embodiment of the present invention provides a network device, including:

a receiving unit, configured to receive a first PPDU sent by a target network device; wherein the first PPDU indicates that the network device needs to send a sounding PPDU, and the first PPDU further comprises a mode indication field, and the mode indication field is used for indicating the network device to generate a sounding PPDU in a target mode;

a generating unit, configured to generate a sounding PPDU of a target mode according to the mode indication field;

and a sending unit, configured to send a second PPDU to the target network device, where the second PPDU is used for the target network device to measure channel information using the second PPDU to obtain a target channel information measurement result, and perform link adaptive adjustment according to the target channel information measurement result.

With reference to the fifth aspect of the embodiment of the present invention, in a first implementation manner of the fifth aspect of the embodiment of the present invention, the mode of the sounding PPDU includes at least one of bandwidth information of the sounding PPDU, whether the sounding PPDU adopts an indoor mode or an outdoor mode, fourier change order information of a long training field of the sounding PPDU, and guard interval information of the sounding PPDU.

With reference to the fifth aspect of the embodiment of the present invention, in a second implementation manner of the fifth aspect of the embodiment of the present invention, the mode of the sounding PPDU includes whether the sounding PPDU adopts an indoor mode or an outdoor mode;

when the mode indication field indicates that the network device generates a sounding PPDU in an outdoor mode, the generating unit is specifically configured to generate an enhanced sounding PPDU according to the mode indication field;

With reference to the fifth aspect of the present invention, or any one of the first to second implementation manners of the fifth aspect, in a third implementation manner of the fifth aspect of the present invention, the channel information includes a channel spreading delay and/or a delay between multiple users;

and the second PPDU is used for the target network equipment to measure the extended delay of the channel and/or the delay among multiple users by using the second PPDU, and the self-adaptive adjustment of the guard interval is carried out according to the measured extended delay of the channel and/or the delay among multiple users.

With reference to the fifth aspect of the present embodiment and any one of the first to second implementation manners of the fifth aspect, in a fourth implementation manner of the fifth aspect of the present embodiment, the channel information includes an SNR of a channel;

the second PPDU is used for the target network equipment to measure the SNR of the channel by using the second PPDU, and the adaptive adjustment of the MCS is carried out according to the measured SNR of the channel.

A sixth aspect of the embodiments of the present invention provides a network device, including:

a generating unit for generating a PPDU; the PPDU indicates the network equipment to actively send a channel information measurement result, and the PPDU further comprises a mode indication field, wherein the mode indication field is used for indicating a mode of a sounding PPDU used by the network equipment to measure channel information;

and a sending unit, configured to send the PPDU to a target network device, where the PPDU is used for the target network device to determine a target channel information measurement result according to the mode indication field and perform link adaptive adjustment according to the target channel information measurement result.

With reference to the sixth aspect of the present embodiment, in a first implementation manner of the sixth aspect of the present embodiment, the mode of the sounding PPDU includes at least one of bandwidth information of the sounding PPDU, whether the sounding PPDU adopts an indoor mode or an outdoor mode, fourier change order information of a long training field of the sounding PPDU, and guard interval information of the sounding PPDU.

With reference to the sixth aspect of the present embodiment or the first implementation manner of the sixth aspect, in a second implementation manner of the sixth aspect of the present embodiment, the channel information includes an extension delay of a channel and/or a delay between multiple users;

and the PPDU is used for the target network equipment to determine a target channel information measurement result according to the mode indication field and to perform self-adaptive adjustment of a guard interval according to the target channel information measurement result.

With reference to the sixth aspect of the embodiment of the present invention or the first implementation manner of the sixth aspect, in a third implementation manner of the sixth aspect of the embodiment of the present invention, the channel information includes a signal-to-noise ratio SNR of the channel;

and the PPDU is used for the target network equipment to determine a target channel information measurement result according to the mode indication field and to perform adaptive adjustment of MCS according to the target channel information measurement result.

In the technical scheme provided by the embodiment of the invention, a first network device obtains a target channel information measurement result, wherein the target channel information measurement result is a measurement result obtained by measuring channel information according to a physical layer protocol data unit PPDU (physical layer protocol data unit) of a target mode; therefore, compared with the prior art, the embodiment of the invention can flexibly obtain the measurement result obtained by using the detection PPDU with a certain specific mode to measure the channel information so as to adapt to different requirements under different application scenes, improve the flexibility of channel information measurement and provide accurate link adaptation for users.

Drawings

FIG. 1 is a diagram illustrating a format of a MAC frame in the IEEE 802.11n standard;

FIG. 2 is a diagram illustrating a format of an HT control field in the IEEE 802.11n standard;

FIG. 3 is a diagram illustrating a format of a Link Adaptation control field of FIG. 2;

FIG. 4 is a diagram illustrating a format of an HT control field in the IEEE 802.11ac standard;

fig. 5 is a schematic diagram of AN embodiment of a link adaptation method of W L AN according to the embodiment of the present invention;

fig. 6 is a diagram illustrating another embodiment of a link adaptation method of W L AN according to AN embodiment of the present invention;

FIG. 7 is a diagram illustrating a format of a sounding PPDU in accordance with an embodiment of the present invention;

fig. 8 is a diagram of another embodiment of a link adaptation method of W L AN according to the embodiment of the present invention;

fig. 9 is a diagram of another embodiment of a link adaptation method of W L AN according to the embodiment of the present invention;

FIG. 10 is a diagram illustrating a format of an HT control field in accordance with an embodiment of the present invention;

fig. 11 is a diagram illustrating another embodiment of a link adaptation method of W L AN according to AN embodiment of the present invention;

fig. 12 is a diagram illustrating another embodiment of a link adaptation method of W L AN according to AN embodiment of the present invention;

fig. 13 is a diagram of another embodiment of a link adaptation method of W L AN according to the embodiment of the present invention;

fig. 14 is a diagram illustrating another embodiment of a link adaptation method of W L AN according to AN embodiment of the present invention;

FIG. 14a is a diagram illustrating another format of the HT control field in accordance with an embodiment of the present invention;

FIG. 15 is a diagram of an embodiment of a network device in an embodiment of the invention;

FIG. 16 is a diagram of another embodiment of a network device in accordance with the present invention;

FIG. 17 is a diagram of another embodiment of a network device in an embodiment of the invention;

FIG. 18 is a diagram of another embodiment of a network device in accordance with the present invention;

fig. 19 is a diagram of another embodiment of a network device in the embodiment of the present invention.

Detailed Description

Embodiments of the present invention provide a link adaptation method for a W L AN and a network device, which can improve flexibility of channel information measurement and provide accurate link adaptation for a user, and are described in detail below.

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 only a part of the embodiments of the present invention, and not all of the embodiments. 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 noted that the embodiment of the present invention is applied to an OFDMA communication system in a wireless local area network, where the OFDMA communication system includes a first network device and at least one second network device, where the at least one second network device is in communication connection with the first network device in a wireless manner.

For example, the first network device may be an AP (Access Point), and the second network device is an STA (Station), or the first network device may also be an STA, and the second network device is an AP.

It should be noted that, in the following embodiments, only link adaptation between the AP and the STA is taken as a specific application scenario, and the principles and embodiments of the present invention are exemplarily described.

To facilitate understanding of embodiments of the present invention, the following describes related art or terms that may be introduced in the description of embodiments of the present invention:

one, high throughput rate control field

The AP or the STA performs link adaptation through a High Throughput (HT) Control field in an MPDU (Medium Access Control Protocol Data Unit, MAC frame for short).

Fig. 1 is a diagram illustrating a format of a MAC frame in the IEEE 802.11n standard. The HT Control field is included in a header of the MAC frame and used for indicating information such as link adaptation and alignment position, and the HT Control field generally exists in a Control Wrapper (Control Wrapper) frame or a QoS data frame when a sequence bit of the frame Control field is set to 1.

The format of the HT control field in some existing standards is briefly described below, for example: the HT control field of the HT variation in the IEEE 802.11n standard and the HT control field of the VHT (Very High Throughput) variation in the IEEE 802.11ac standard.

Fig. 2 is a schematic diagram illustrating a format of an HT control field (i.e., an HT control field of an HT variant) in the IEEE 802.11n standard, wherein a link adaptation control field in the HT control field in fig. 2 is used for indicating information related to link adaptation, and specifically, see fig. 3, which is a schematic diagram illustrating a format of a link adaptation control field.

The link adaptation process of one of MCS (Modulation and Coding Scheme) in IEEE 802.11n standard is briefly introduced below, which is referred to as TRQ (probing Request) mode, where a link adaptation Request end sends PPDU (Physical L layer Protocol Data Unit) including HT-variant HT control field to a response end, where the TRQ is set to 1 to indicate that the response end needs to send a probing PPDU, a responder generates a probing PPDU according to the HT-variant HT control field and sends the probing PPDU to the link adaptation Request end, and the link adaptation Request end measures channel information according to the probing PPDU and performs link adaptation adjustment according to the channel information.

Based on the IEEE 802.11n standard, the HT control field of the VHT variant of the IEEE 802.11ac standard is designed more fully, as shown in fig. 4, which is a schematic diagram of the format of the HT control field (i.e., the HT control field of the VHT variant) of the IEEE 802.11ac standard. And multiplexing the HT control field of the HT variant by the HT control field of the VHT variant, wherein the first bit which is originally a reserved bit in the HT control field of the HT variant is used as a VHT bit, the two versions are distinguished by the VHT bit, when the VHT bit is 0, the current HT control field is the HT control field of the HT variant, and when the VHT bit is 1, the current HT control field is the HT control field of the VHT variant.

The following briefly introduces a link adaptation procedure of two MCSs in the IEEE 802.11ac standard, including a request-feedback mechanism and an unsolicited mode-feedback mechanism:

in a link adaptation flow of a request-feedback mechanism, a link adaptation request end sends a detection PPDU to a response end, wherein VHT is set to 1 to indicate that a current HT control field is a VHT variant HT control field, VHT is set to 1, MRQ (MCS request) is set to 1 to indicate that the response end needs to perform MCS feedback; the response end measures the channel information by using the detection PPDU and feeds back the measurement result of the channel information to the link adaptation request end, so that the link adaptation request end carries out link adaptation adjustment according to the measurement result of the channel information.

The unsolicited-feedback mechanism refers to that an active feedback end actively feeds back a channel information measurement result for any one or more frames of data previously sent by a communication opposite end under the condition that the communication opposite end does not send a feedback request. In a link adaptation flow of an Unsolicited-feedback mechanism, an active feedback end actively sends a PPDU including a HT control field of a VHT variant to a communication peer end thereof, where VHT is set to 1 to indicate that a current HT control field is the HT control field of the VHT variant, and an Unsolicited MFB (Unsolicited MCS feedback indicator) is set to 1 to indicate that MCS feedback is Unsolicited active feedback, and an MFB (MCS feedback) field carries a corresponding channel information measurement result, so that the communication peer end performs link adaptation adjustment according to the channel information measurement result.

It should be noted that some common information in the HT control field, such as MSI/STBC (MCS request sequence guide/space-time block coding) fields, are not described herein, and those skilled in the art can refer to the specification in the existing relevant standard and the following relevant standard.

Two, link adaptation

In this embodiment, the parameter adjusted by link adaptation may include at least one of MCS, GI (Guard Interval), redundancy information, transmit power, and time-frequency resource. In this embodiment, the channel parameters used for measuring the channel information may be determined according to parameters adjusted by link adaptation, such as SNR (Signal to noise ratio) of the channel, spreading delay of the channel, or delay between multiple users, and correspondingly, in the link adaptation process of the request-feedback mechanism and the non-request-feedback mechanism, the channel information measurement result obtained by measuring the channel information also includes multiple contents, such as MCS, GI, or antenna selection.

For example, when the link adaptation of the MCS is the MCS, that is, the parameter adjusted by the link adaptation is the MCS, the channel information may include an SNR (Signal to Noise Ratio) of the channel, and the corresponding channel information measurement result may include: a number of proposed space-time streams, a proposed MCS, a bandwidth employed by the proposed MCS, an average efficient SNR, etc.

For example, when the link adaptation of the GI, i.e., the parameter adjusted by the link adaptation, is the MCS, the channel information may include the spreading delay of the channel and/or the inter-user delay, and the corresponding channel information measurement result may include the suggested GI.

It should be noted that, in some embodiments below, link adaptation of GI is mainly taken as a specific application scenario, and the principle and the implementation of the present invention are exemplarily described.

Referring to fig. 5, AN embodiment of a link adaptation method of a W L AN according to the embodiment of the present invention includes:

501. the first network equipment acquires a target channel information measurement result;

the target channel information measurement result is a measurement result obtained by measuring channel information according to the sounding PPDU in the target mode, and thus step 501 may specifically be understood as: first, a first network device determines a sounding PPDU of a target mode, and then obtains a target channel information measurement result obtained by measuring channel information using the sounding PPDU of the target mode.

In this embodiment, the first network device may determine the sounding PPDU in the target mode according to an application scenario, that is, select the sounding PPDU in the target mode correspondingly adapted in different application scenarios, for example, the first network device may determine the sounding PPDU in the target mode according to an indoor scenario or an outdoor scenario, channel information to be measured, accuracy requirement of the channel information, requirement of feedback efficiency, busy condition of a channel in a cell, and the like, where a rule of selecting the mode of the sounding PPDU is not limited.

It should be noted that, in this embodiment, the mode of the sounding PPDU may include at least one of bandwidth information of the sounding PPDU, whether the sounding PPDU adopts the indoor mode or the outdoor mode, Fourier transform order information of L TF (L one Training Field) of the sounding PPDU, and guard interval information of the sounding PPDU, where the bandwidth information of the sounding PPDU refers to which bandwidth the sounding PPDU adopts, and the Fourier transform order information of the long Training Field of the sounding PPDU refers to which order FFT (Fast Fourier transform ) of the sounding PPDU adopts, for example, a 64-point FFT, or a larger FFT, such as a 128-point FFT or a 256-point FFT, and the like.

It is understood that in the present embodiment, in the link adaptation procedure of different mechanisms, the manner of obtaining the target channel information measurement result will be different, and specifically, how to obtain the target channel information measurement result will be described in detail in the following embodiments.

502. The first network equipment performs link self-adaptive adjustment according to the target channel information measurement result;

in this embodiment, the channel information measurement result referred to for link adaptation adjustment is obtained by performing channel information measurement using a sounding PPDU in a target mode, and thus, the channel information measurement result is more targeted for a current application scenario, and thus, accurate link adaptation can be provided for a user.

Referring to fig. 6, a link adaptation procedure of the TRQ mode is described below from the perspective of the first network device, and another embodiment of the link adaptation method of the W L AN according to the embodiment of the present invention includes:

601. the first network equipment sends a first PPDU to the second network equipment;

in this embodiment, the first PPDU indicates that the second network device needs to send the sounding PPDU, and it can be understood that, in an actual application process, the first PPDU may indicate that the second network device needs to send the sounding PPDU through a preamble field thereof or an MPDU carried by the first PPDU, which is not limited herein.

In this embodiment, the first PPDU further includes a Mode indication field, for example, a T-Mode (required Mode of the sounding PPDU) field, where the T-Mode field is used to indicate the second network device to generate the sounding PPDU of the target Mode, and it is understood that, in an actual application process, the T-Mode field may be included in a preamble field (for example, SIG-B field) of the first PPDU or may be included in an MPDU of the first PPDU, which is not limited herein.

How the T-Mode field instructs the second network device to generate a probed PPDU in the target Mode is described in detail below, which is illustrated below:

(1) a first field;

for example, the first field is denoted as a BW (Bandwidth) field, and the BW field is used to indicate a Bandwidth that the sounding PPDU should adopt, that is, when the mode of the sounding PPDU includes Bandwidth information of the sounding PPDU, which Bandwidth the sounding PPDU adopts may be indicated by the BW field.

(2) A second field;

for example, the second field is denoted as an Indoor/out-door (Indoor/Outdoor mode) field, and the Indoor/out-door field is used to indicate whether the sounding PPDU should adopt the Indoor mode or the Outdoor mode, that is, when the mode of sounding the PPDU includes that the sounding PPDU adopts the Indoor mode or the Outdoor mode, whether the sounding PPDU adopts the Indoor mode or the Outdoor mode may be indicated by the Indoor/out-door field.

(3) A third field;

for example, the third field is denoted as NX _ HE-L TF (N × 64FFT of HE-L TF, FFT order of high efficiency long training field) field, and the NX _ HE-L TF field is used to indicate the order of FFT to be adopted by the long training field of the sounding PPDU, that is, when the mode of the sounding PPDU includes fourier transform order information of the long training field of the sounding PPDU, it can be indicated by the NX _ HE-L TF field which order of FFT is adopted by the sounding PPDU, for example, in an actual application process, the order of the current FFT can be expressed as N times of 64 with 64 points as a reference, where N may be 1, 2, 4, and so on.

(4) A fourth field;

for example, the fourth field is denoted as a GI field, and the GI field is used to indicate a guard interval length that the sounding PPDU should adopt, that is, when the mode of the sounding PPDU includes guard interval information of the sounding PPDU, which length GI the sounding PPDU adopts may be indicated by the GI field, for example, 0.4, 0.8us, or a longer GI, such as 1.6, 2.4, or 3.2 us.

It can be understood that the mode of the sounding PPDU may further include more information for describing parameters of the sounding PPDU, which is not limited herein, and correspondingly, a corresponding field may be set to indicate the related information.

602. The first network equipment receives a second PPDU sent by the second network equipment;

in this embodiment, the second PPDU is a sounding PPDU of a target Mode generated by the second network device according to the T-Mode field.

For example, when the Indoor/Outdoor field indicates that the sounding PPDU should adopt the Outdoor mode, the sounding PPDU corresponding to the generated target mode (i.e., the sounding PPDU of the Outdoor mode) is an enhanced sounding PPDU, and please refer to fig. 7, where the enhanced sounding PPDU refers to a sounding PPDU having at least one of the following formats:

(1) at least one symbol of a preamble of the sounding PPDU is partially or completely copied in a time domain or a frequency domain;

that is, the second network device copies a part or all of a symbol in the preamble in the time domain or the frequency domain during the generation of the sounding PPDU, and as shown in fig. 7, copies L-SIG symbols completely.

(2) Detecting that GI (GI) between part or all symbols of the PPDU is larger than a first preset value;

that is, the second network device uses a longer GI in the process of generating the sounding PPDU, where the first preset value may be set according to an actual scenario and may be, for example, 0.8us, and the sounding PPDU in the outdoor mode may use a longer GI than a conventional sounding PPDU, such as 1.6, 2.4, 3.2us, and the like, and at this time, the increased GI helps to resist a larger extension delay in the outdoor scenario.

(3) Detecting MCS of at least one symbol of the PPDU to meet a certain preset condition;

that is, during the generation of the sounding PPDU, the MCS of at least one symbol of the sounding PPDU is more robust, for example, MCS0 to MCS0 which is the most robust in MCS9, or MCS10 in IEEE 802.11ah standard, which is more robust than MCS0, so that, during the actual application, the signaling field or the data field of the sounding PPDU may adopt the modulation coding scheme of MCS 10.

(4) The order of the FFT of at least one symbol of the sounding PPDU is higher than a second preset value.

That is, in the process of generating the sounding PPDU, the sounding PPDU may adopt an FFT with a larger order, such as a 128-point FFT or a 256-point FFT, where the larger FFT not only may improve efficiency, but also may reduce an influence caused by an extended delay.

It should be noted that, the format of the sounding PPDU in the outdoor mode is described above by way of example only, and in practical applications, the format of the sounding PPDU in the outdoor mode may be used in combination with the above formats, and more other formats may also be adopted according to needs.

603. The first network equipment measures channel information by using the second PPDU to obtain a target channel information measurement result;

in this embodiment, the second PPDU is a sounding PPDU of a target Mode generated according to the T-Mode field, and thus, a target channel information measurement result can be obtained by measuring channel information using the sounding PPDU.

604. The first network equipment performs link self-adaptive adjustment according to the target channel information measurement result;

optionally, in this embodiment, the channel information includes a channel spreading delay and/or a delay between multiple users, and the corresponding target channel information measurement result is a target GI, then step 604 specifically includes: the first network device performs adaptive adjustment of the GI according to the target GI.

Or, in this embodiment, the channel information may also include an SNR of the channel, and the corresponding target channel information measurement result is a target MCS, then step 604 specifically includes: and the first network equipment performs adaptive adjustment of the MCS according to the target MCS.

It is understood that, in the present embodiment, the channel parameters used for measuring the channel information may be determined according to the parameters adjusted by link adaptation.

In the technical solution provided in the embodiment of the present invention, a first network device sends a first PPDU to a second network device, where the first PPDU indicates that the second network device needs to send a sounding PPDU, and the first PPDU further includes a mode indication field, where the mode indication field is used to indicate the second network device to generate a sounding PPDU in a target mode; receiving a second PPDU, wherein the second PPDU is a detection PPDU of a target mode generated by the second network equipment according to the mode indication field; and then measuring channel information by using the second PPDU to obtain a target channel information measurement result, and performing link self-adaptive adjustment according to the target channel information measurement result. Therefore, compared with the prior art, the embodiment of the invention also carries the mode indication field in the first PPDU to specify the mode of the detection PPDU, so that the detection PPDU corresponding to the mode can be used for measuring the channel information to obtain the corresponding channel information measurement result.

Referring to fig. 8, a link adaptation procedure of the TRQ mode is described below from the perspective of the second network device, where another embodiment of the link adaptation method of the W L AN in the embodiment of the present invention includes:

801. the second network equipment receives a first PPDU sent by the first network equipment;

In this embodiment, the first PPDU further includes a mode indication field, where the mode indication field is used to indicate the second network device to generate the sounding PPDU in the target mode, and specifically, the description of the mode indication field here may refer to the description of step 601 in the embodiment shown in fig. 6, and is not described here again.

802. The second network equipment generates a second PPDU of the target mode according to the mode indication field;

in this embodiment, after receiving the first PPDU sent by the first network device, the second network device reads the mode indication field therein, and generates a probe PPDU of a corresponding target mode, that is, a second PPDU, according to the mode indication field.

803. The second network equipment sends a second PPDU to the first network equipment;

the second PPDU is used for the first network equipment to measure the channel information by using the second PPDU, obtain a target channel information measurement result and carry out link self-adaptive adjustment according to the target channel information measurement result.

Referring to fig. 9, a detailed description will be made of a link adaptation method of a W L AN in TRQ mode, taking the example that a mode indication field is included in AN HT control field of a first PPDU based on the embodiments shown in fig. 6 and 8, where another embodiment of the link adaptation method of a W L AN in the embodiment of the present invention includes:

901. the first network equipment sends a first PPDU to the second network equipment;

for example, in an actual application process, the TRQ bit may be set to 1 to indicate that the second network device needs to send the sounding PPDU, and refer to fig. 10 specifically.

In this embodiment, the MPDU includes an HT control field, and the HT control field further includes a T-Mode field, where the T-Mode field is used to indicate that the second network device generates a sounding PPDU in a target Mode, for example, in fig. 10, the BW field is used to indicate a bandwidth that the sounding PPDU should adopt, the inoor/out door field is used to indicate whether the sounding PPDU should adopt an Indoor Mode or an Outdoor Mode, the NX _ HE-L TF field is used to indicate an order of an FFT that the long training field of the sounding PPDU should adopt, and the GI field is used to indicate a guard interval length that the sounding PPDU should adopt.

It is understood that the T-Mode field may further include more fields for indicating parameters of the sounding PPDU, and is not limited herein.

In an actual application process, the T-Mode field may be set according to an application scenario to indicate a target Mode of the PPDU, where the application scenario includes an indoor scenario or an outdoor scenario, channel information to be measured, an accuracy requirement of the channel information, a requirement of feedback efficiency, a busy condition of a channel in a cell, and the like, and the following examples are given:

if the first network device is in an Indoor scene, the inoor/out-or field of the T-Mode field may be set to be in an Indoor Mode, so as to generate a sounding PPDU in the Indoor Mode, where a GI of the sounding PPDU is short, for example, 0.8us, thereby ensuring that overhead caused by sending the sounding PPDU by the second network device is reduced as much as possible on the premise that the first network device obtains a channel information measurement result.

If the channel information to be measured by the first network device is the extended delay, the GI field of the T-Mode field may be set to be the longest GI to ensure that the GI length of the long training field of the sounding PPDU is greater than the extended delay of the current channel, otherwise, signals on multiple paths of the channel may overlap, and the extended delay of the current channel may not be measured correctly even if the sounding PPDU is received.

If the first network device has a high requirement on the accuracy of the channel information, if the channel information of all subcarriers is desired to be measured, the NX _ HE-L TF field of the T-Mode field can be set to 4X HE-L TF, wherein if the channel correlation characteristics of the adjacent subcarriers of the channel are high, the NX _ HE-L TF field of the T-Mode field can be set to 1X HE-L TF or 2X HE-L TF, at this time, the first network device interpolates the channel measured by the 1X HE-L TF or the 2X HE-L TF, and on the premise of obtaining the channel information on all subcarriers, the overhead caused by the fact that the second network device sends the detection PPDU is reduced as much as possible.

For example, when the transmission efficiency is higher on a certain channel (for example, 20M) according to the busy condition of the channels in the cell, the BW field of the T-Mode field may be set to 20M bandwidth, so that the second network device may acquire the opportunity to transmit the sounding PPDU more quickly, so that the first network device may perform the measurement of the channel information as soon as possible.

It should be noted that, the specific manner in which the first network device sets the T-Mode field is described above by using only a few examples, and in practical applications, the first network device may combine the above setting manners, and may also use other setting manners, and the specific setting manner is not limited herein.

The specific description of the T-Mode field herein can refer to step 601 in the embodiment shown in fig. 6, and the specific format of the T-Mode field is described in detail below on the basis of the following:

first, it should be noted that, in this embodiment, a new version identification field, for example, denoted as HE bit, may be added to the MPDU in the embodiment of the present invention, and thus, the HT control field in the embodiment of the present invention may be understood as an HT control field of an HE variation. In practical application, to realize downward compatibility of the version, HE bit is set at the subsequent bit position of VHT bit on the basis of HT control field of VHT variant. It will be appreciated that in some specific application scenarios, the version identification field described above may not be included.

In this embodiment, the specific position and number of bits of the T-Mode field are not limited, for example, as shown in fig. 10, the BW field may include 2 bits, the inoor/out field may include one bit, the NX _ HE-L TF field may include 2 bits, and the GI field may include 2 bits.

Optionally, in this embodiment, the MPDU may further include a fifth field, for example, a Required (number of sounding PPDUs that need to be transmitted) field, where the Required field is used to indicate the number of sounding PPDUs that need to be transmitted by the second network device. Of course, in other embodiments, the Required field may be included in other parts of the first PPDU, such as the preamble field.

Alternatively, in this embodiment, the MPDU may include a Control wrap (Control Wrapper) frame, a QoS data frame when the sequence bit of the frame Control field is set to 1, a beacon frame, a probe response frame, or an association response frame, and the like. In the practical application process, some frames of other types may also be included, and the frame type of the MPDU is not specifically limited here.

902. The second network equipment generates a second PPDU of the target mode according to the mode indication field;

in this embodiment, after receiving the first PPDU sent by the first network device, the second network device reads the T-Mode field therein, and generates a probe PPDU of a corresponding target Mode, that is, a second PPDU, according to the T-Mode field.

In this embodiment, corresponding to the Required field, the second PPDU may further include a sixth field, for example, a Number of Remaining sounding PPDUs that need to be transmitted (Number of Remaining sounding PPDUs) field, where the Remaining field is used to indicate the Number of sounding PPDUs that will be transmitted subsequently by the second network device.

Specifically, for the description of the sounding PPDU, reference may be made to step 602 in the embodiment shown in fig. 6, which is not described herein again.

903. The second network equipment sends a second PPDU to the first network equipment;

904. the first network equipment measures channel information by using the second PPDU to obtain a target channel information measurement result;

905. the first network equipment performs link self-adaptive adjustment according to the target channel information measurement result;

steps 904 to 905 in this embodiment are the same as steps 603 to 604 in the embodiment shown in fig. 6, and detailed description thereof is omitted here.

For convenience of understanding, a specific application scenario will be described below with reference to the HT control field shown in fig. 10 to describe a GI link adaptation procedure in the TRQ mode, and referring to fig. 11, AN embodiment of a link adaptation method in the W L AN according to the embodiment of the present invention includes:

1101. the AP sends a first PPDU carrying an HT control field of the HE variant to the STA;

in this embodiment, both the VHT bit and the HE bit of the HT control field are set to 1 to indicate that the current HT control field is an HT control field of an HE variant; setting TRQ to 1 to indicate GI link adaptation in TRQ mode is to be carried out; the T-Mode field and Required field are then set.

1102. The STA generates a second PPDU of the target mode according to the first PPDU;

in this embodiment, the STA reads the MPDU, wherein it learns that the sounding PPDU needs to be transmitted through the TRQ, further reads the T-Mode field, learns the Mode of the sounding PPDU that needs to be transmitted, reads the Required field, obtains the number of the sounding PPDUs that need to be transmitted, and generates a corresponding sounding PPDU, that is, a second PPDU. In this embodiment, the second PPDU carries an HT control field, and both a VHT bit and an HE bit of the HT control field are set to 1 to indicate that the current HT control field is an HT control field of the HE variation, and then a Remaining field is set to indicate the number of sounding PPDUs to be transmitted by the STA subsequently.

1103. The STA sends a second PPDU to the AP;

1104. the AP measures the extended delay of the channel and/or the delay among multiple users by using the second PPDU to obtain a target GI;

wherein the AP measures the extended delay and/or the inter-multi-user delay through the long training field of the second PPDU.

1105. The AP performs adaptive adjustment of the GI according to the target GI;

in this embodiment, after obtaining the target GI, the AP may perform adaptive adjustment of the GI according to the target GI.

Referring to fig. 12, a link adaptation procedure of AN unsolicited-feedback mechanism is described below from the perspective of a first network device, where another embodiment of a link adaptation method of a W L AN according to the embodiment of the present invention includes:

1201. the first network equipment receives a PPDU sent by the second network equipment;

in this embodiment, the PPDU instructs the second network device to actively transmit the channel information measurement result to indicate that link adaptation of the unsolicited-feedback mechanism is to be performed, and it can be understood that, in an actual application process, the PPDU may instruct the second network device to actively transmit the channel information measurement result through a preamble field thereof or an MPDU carried by the PPDU, which is not limited herein.

In this embodiment, the first PPDU further includes a Mode indication field, for example, a T-Mode (sounding PPDU Mode) field, where the T-Mode field is used to indicate a Mode of a sounding PPDU used by the second network device to measure the channel information; it is understood that, in an actual application process, the T-Mode field may be included in a preamble field (e.g., SIG-B field) of the first PPDU, or may be included in an MPDU of the first PPDU, which is not limited herein.

How the T-Mode field indicates the Mode of the sounding PPDU used by the second network device to measure the channel information is described in detail below, which respectively illustrates:

(1) a first field;

for example, the first field is denoted as a BW (Bandwidth) field, and the BW field is used to indicate a Bandwidth adopted by the sounding PPDU, that is, when the mode of the sounding PPDU includes Bandwidth information of the sounding PPDU, which Bandwidth is adopted by the sounding PPDU can be indicated by the BW field.

(2) A second field;

for example, the second field is denoted as an Indoor/out-door (Indoor/Outdoor mode) field, and the Indoor/out-door field is used to indicate whether the sounding PPDU adopts the Indoor mode or the Outdoor mode, that is, when the mode of sounding the PPDU includes that the sounding PPDU adopts the Indoor mode or the Outdoor mode, whether the sounding PPDU adopts the Indoor mode or the Outdoor mode may be indicated through the Indoor/out-door field.

(3) A third field;

for example, the third field is denoted as NX _ HE-L TF (N × 64FFT of HE-L TF, FFT order of high efficiency long training field) field, and the NX _ HE-L TF field is used to indicate the order of the FFT used by the long training field of the sounding PPDU, that is, when the mode of the sounding PPDU includes fourier transform order information of the long training field of the sounding PPDU, it may be indicated by the NX _ HE-L TF field that the sounding PPDU uses which order of FFT, for example, in an actual application process, the order of the current FFT may be expressed as N times of 64 with 64 points as a reference, where N may be 1, 2, 4, and so on.

(4) A fourth field;

for example, the fourth field is denoted as a GI field, and the GI field is used to indicate a guard interval length adopted by the sounding PPDU, that is, when the mode of the sounding PPDU includes guard interval information of the sounding PPDU, which length GI is adopted by the sounding PPDU may be indicated by the GI field, for example, 0.4, 0.8us, or a longer GI, such as 1.6, 2.4, or 3.2 us.

It should be noted that, in the link adaptation procedure of the unsolicited-feedback mechanism, the second network device may actively send multiple PPDUs to the first network device, so as to actively feed back multiple channel information measurement results to the first network device without interruption. It is understood that, in practical applications, the second network device may measure the channel information in any mode of the sounding PPDU, for example, the second network device may measure the channel information using the sounding PPDU in the outdoor mode, or the second network device may measure the channel information using the sounding PPDU in the indoor mode (here, the sounding PPDU in the outdoor mode may refer to step 602 in the embodiment shown in fig. 6), which is not limited herein.

1202. The first network equipment determines a target channel information measurement result according to the mode indication field;

in this embodiment, after receiving the PPDU, the first network device may learn, according to the mode indication field, which mode of the channel information measurement result indicated by the PPDU is measured by using the sounding PPDU, and determine whether to select the measurement result obtained by measuring the channel information by using the sounding PPDU in the mode as the channel information measurement result referred to by the subsequent link adaptive adjustment, and if so, determine that the channel information measurement result is the target channel information measurement result.

It can be understood that, in a link adaptation flow of an unsolicited-feedback mechanism, a first network device may receive multiple PPDUs sent by a second network device, and learn, according to an indication of a mode indication field, which mode of sounding PPDU is used for measuring channel information measurement results in each PPDU, so that the first network device wants to obtain a measurement result obtained by measuring channel information using a certain mode of sounding PPDU, and only needs to select according to the indication of the mode indication field to adapt to different requirements in different application scenarios.

1203. The first network equipment performs link self-adaptive adjustment according to the target channel information measurement result;

in this embodiment, the target channel information measurement result is a measurement result obtained by the first network device measuring channel information using a sounding PPDU of a certain mode, and thus, the first network device can flexibly select which mode of sounding PPDU is used to perform link adaptive adjustment.

In the technical solution provided in the embodiment of the present invention, a first network device receives a PPDU sent by a second network device, where the PPDU indicates the second network device to actively send a channel information measurement result, and the PPDU further includes a mode indication field, where the mode indication field is used to indicate a mode of a sounding PPDU used by the second network device to measure channel information; the first network equipment determines a target channel information measurement result according to the mode indication field; and performing link adaptive adjustment according to the target channel information measurement result, so that the first network device can flexibly select which mode of the measurement result obtained by the detection PPDU measuring channel information is used for performing link adaptive adjustment. Therefore, compared with the prior art, the embodiment of the present invention further carries a mode indication field in the PPDU to specify the mode of the sounding PPDU used for measuring the channel information, so that the first network device can know which mode of the sounding PPDU is used for measuring the channel information measurement result, and thus, the embodiment of the present invention can flexibly obtain the measurement result obtained by measuring the channel information using the sounding PPDU of a certain specific mode, so as to adapt to different requirements in different application scenarios, improve the flexibility of channel information measurement, and thereby provide accurate link adaptation for users.

Referring to fig. 13, a link adaptation procedure of AN unsolicited-feedback mechanism is described from the perspective of a second network device, where another embodiment of a link adaptation method of a W L AN according to the embodiment of the present invention includes:

1301. the second network equipment generates a PPDU;

In this embodiment, the PPDU further includes a mode indication field, where the mode indication field is used to indicate a mode of the sounding PPDU used by the second network device for measuring the channel information, and specifically, for a description of the mode indication field here, reference may be made to the description of step 1201 in the embodiment shown in fig. 12, which is not described herein again.

1302. The second network equipment sends PPDU to the first network equipment;

in this embodiment, the PPDU is used by the first network device to determine a target channel information measurement result according to the mode indication field, and perform link adaptive adjustment according to the target channel information measurement result. Specifically, for the process that the first network device determines the target channel information measurement result according to the mode indication field and performs link adaptive adjustment according to the target channel information measurement result, refer to step 1202 and step 1203 in the embodiment shown in fig. 12.

Referring to fig. 14, a detailed description will be made of a link adaptation method of a W L AN of AN unsolicited-feedback mechanism based on the embodiments shown in fig. 12 and 13, taking the example that the mode indication field is included in the HT control field of the PPDU, where another embodiment of the link adaptation method of a W L AN in the embodiments of the present invention includes:

1401. the second network equipment generates a PPDU;

in this embodiment, the PPDU carries at least one MPDU, and the MPDU instructs the second network device to actively transmit the channel information measurement result to indicate that link adaptation of the unsolicited-feedback mechanism is to be performed. It can be appreciated that the MPDU also carries channel information measurements. For example, in practical application, the second network device may be instructed to actively send the channel information measurement result by setting an unoiled MFB (Unsolicited GI Feedback) field to 1, where the channel information measurement result is carried in a GFB (GI Feedback) field to indicate a suitable GI to the first network device, specifically referring to fig. 14 a.

In this embodiment, the MPDU includes an HT control field, and the HT control field further includes a T-Mode field, where the T-Mode field is used to indicate a Mode of a sounding PPDU used by the second network device to measure channel information, such as a BW field used to indicate a bandwidth employed by the sounding PPDU, an inoor/out field used to indicate whether the sounding PPDU employs an Indoor Mode or an Outdoor Mode, an NX _ HE-L TF field used to indicate an order of an FFT employed by a long training field of the sounding PPDU, and a GI field used to indicate a guard interval length employed by the sounding PPDU in fig. 14 a.

It is understood that the T-Mode field may further include more fields for indicating parameters of the sounding PPDU, and is not limited herein. The T-Mode field is described with reference to step 1201 in the embodiment shown in fig. 12. In this embodiment, specific positions and numbers of bits of the T-Mode field are not limited, and reference may be made to step 901 in the embodiment shown in fig. 9.

Alternatively, in this embodiment, the MPDU may include a Control wrap (Control Wrapper) frame, a QoS data frame when the sequence bit of the frame Control field is set to 1, a probe request frame, or an association request frame, and the like. In the practical application process, some frames of other types may also be included, and the frame type of the MPDU is not specifically limited here.

1402. The second network equipment sends PPDU to the first network equipment;

1403. the first network equipment determines a target channel information measurement result according to the mode indication field;

1404. the first network equipment performs link self-adaptive adjustment according to the target channel information measurement result;

steps 1403 to 1404 in this embodiment are the same as steps 1202 to 1203 in the embodiment shown in fig. 12, and are not described again here.

With reference to fig. 15, the link adaptation method of the W L AN in the embodiment of the present invention is described above, and a network device in the embodiment of the present invention is described below, where AN embodiment of the network device in the embodiment of the present invention includes:

the network device in the embodiment of the present invention may implement the flow of the embodiment shown in fig. 5, where the network device includes:

an obtaining unit 1510, configured to obtain a target channel information measurement result, where the target channel information measurement result is a measurement result obtained by measuring channel information according to a sounding physical layer protocol data unit PPDU in a target mode;

and an adjusting unit 1520, configured to perform link adaptive adjustment according to the target channel information measurement result.

For convenience of understanding, the following describes an internal operation flow of the network device in this embodiment by taking a specific application scenario as an example:

the obtaining unit 1510 obtains a target channel information measurement result, where the target channel information measurement result is a measurement result obtained by measuring channel information according to a sounding physical layer protocol data unit PPDU in a target mode; the adjusting unit 1520 performs link adaptive adjustment according to the target channel information measurement result.

In the technical solution provided in the embodiment of the present invention, an obtaining unit 1510 of a network device obtains a target channel information measurement result, where the target channel information measurement result is a measurement result obtained by measuring channel information according to a detection physical layer protocol data unit PPDU in a target mode; and the adjusting unit 1520 performs link adaptive adjustment according to the target channel information measurement result, so compared with the prior art, the embodiment of the present invention can flexibly obtain the measurement result obtained by measuring the channel information using the sounding PPDU of a certain mode, so as to adapt to different requirements in different application scenarios, improve the flexibility of channel information measurement, and thereby provide accurate link adaptation for users.

Referring to fig. 16, a network device in TRQ mode is described, in which another embodiment of a method of a network device in an embodiment of the present invention includes:

the network device in the embodiment of the present invention may implement the flow of the embodiment shown in fig. 6, where the network device includes:

a sending module 1611, configured to send a first PPDU to a target network device, where the first PPDU indicates that the target network device needs to send a probe PPDU, and the first PPDU further includes a mode indication field, where the mode indication field is used to indicate that the target network device generates a probe PPDU in a target mode;

a first receiving module 1612, configured to receive a second PPDU sent by the target network device, where the second PPDU is a sounding PPDU of a target mode generated by the target network device according to the mode indication field;

a first obtaining module 1613, configured to measure channel information using the second PPDU, to obtain the target channel information measurement result;

an adjusting unit 1620, configured to perform link adaptive adjustment according to the target channel information measurement result.

Optionally, in this embodiment, the mode of the sounding PPDU includes at least one of bandwidth information of the sounding PPDU, whether the sounding PPDU adopts an indoor mode or an outdoor mode, fourier change order information of a long training field of the sounding PPDU, and guard interval information of the sounding PPDU.

Optionally, in this embodiment, the mode of the sounding PPDU includes whether the sounding PPDU adopts an indoor mode or an outdoor mode; when the mode indication field indicates that the target network equipment generates the detection PPDU in the outdoor mode, the second PPDU is an enhanced detection PPDU generated by the target network equipment according to the mode indication field;

Optionally, in this embodiment, the channel information includes an extension delay of a channel and/or a delay between multiple users;

the adjusting unit 1620 is specifically configured to perform adaptive adjustment of a guard interval according to the target channel information measurement result.

Optionally, in this embodiment, the channel information includes SNR of the channel;

the adjusting unit 1620 is specifically configured to perform adaptive adjustment of the modulation and coding scheme MCS according to the target channel information measurement result.

In the technical solution provided in the embodiment of the present invention, a sending module 1611 of a network device sends a first PPDU to a target network device, where the first PPDU indicates that the target network device needs to send a probe PPDU, and the first PPDU further includes a mode indication field, where the mode indication field is used to indicate the target network device to generate a probe PPDU in a target mode; receiving, by the first receiving module 1612, a second PPDU, where the second PPDU is a sounding PPDU of a target mode generated by the target network device according to the mode indication field; then, the first obtaining module 1613 measures the channel information using the second PPDU to obtain a target channel information measurement result, and performs link adaptive adjustment according to the target channel information measurement result through the adjusting unit 1620. Therefore, compared with the prior art, the embodiment of the invention also carries the mode indication field in the first PPDU to specify the mode of the detection PPDU, so that the detection PPDU corresponding to the mode can be used for measuring the channel information to obtain the corresponding channel information measurement result.

Referring to fig. 17, another network device in the TRQ mode is described below, and in another embodiment of the network device in the embodiment of the present invention, the method includes:

the network device in the embodiment of the present invention may implement the flow of the embodiment shown in fig. 8, where the network device includes:

a receiving unit 1710, configured to receive a first PPDU sent by a target network device; wherein the first PPDU indicates that the network device needs to send a sounding PPDU, and the first PPDU further comprises a mode indication field, and the mode indication field is used for indicating the network device to generate a sounding PPDU in a target mode;

a generating unit 1720, configured to generate a sounding PPDU of a target mode according to the mode indication field;

a sending unit 1730, configured to send a second PPDU to the target network device, where the second PPDU is used by the target network device to measure channel information using the second PPDU, obtain a target channel information measurement result, and perform link adaptive adjustment according to the target channel information measurement result.

Referring to fig. 18, a network device of an unsolicited-feedback mechanism is described, in which a method of the network device according to another embodiment of the present invention includes:

the network device in the embodiment of the present invention may implement the flow of the embodiment shown in fig. 12, where the network device includes:

a second receiving module 1811, configured to receive a PPDU sent by a target network device; the PPDU indicates a target network device to actively send a channel information measurement result, and the PPDU further comprises a mode indication field, wherein the mode indication field is used for indicating a mode of a detection PPDU used by the target network device to measure the channel information;

a second obtaining module 1812, configured to determine a target channel information measurement result according to the mode indication field;

an adjusting unit 1820, configured to perform link adaptive adjustment according to the target channel information measurement result.

the adjusting unit 1820 is specifically configured to perform adaptive adjustment of a guard interval according to the target channel information measurement result.

the adjusting unit 1820 is specifically configured to perform adaptive adjustment of the modulation and coding scheme MCS according to the target channel information measurement result.

In the technical solution provided in the embodiment of the present invention, a second receiving module 1811 of a network device receives a PPDU sent by a target network device, where the PPDU indicates the target network device to actively send a channel information measurement result, and the PPDU further includes a mode indication field, where the mode indication field is used to indicate a mode of a sounding PPDU used by the target network device to measure channel information; and the second obtaining module 1812 determines the target channel information measurement result according to the mode indication field; and then, the link adaptive adjustment is performed by the adjustment unit 1820 according to the target channel information measurement result, so that the network device can flexibly select which mode of the measurement result obtained by measuring the channel information by using the sounding PPDU to perform the link adaptive adjustment. Therefore, compared with the prior art, the embodiment of the present invention further carries a mode indication field in the PPDU to specify the mode of the sounding PPDU used for measuring the channel information, so that the network device knows which mode of the sounding PPDU is used for measuring the channel information measurement result, and thus, the embodiment of the present invention can flexibly obtain the measurement result obtained by measuring the channel information using the sounding PPDU of a certain specific mode, so as to adapt to different requirements in different application scenarios, improve the flexibility of channel information measurement, and thereby provide accurate link adaptation for users.

Referring to fig. 19, another network device with unsolicited-feedback mechanism is described, and a method of the network device in the embodiment of the present invention further includes:

the network device in the embodiment of the present invention may implement the flow of the embodiment shown in fig. 13, where the network device includes:

a generating unit 1901 configured to generate a PPDU; the PPDU indicates the network equipment to actively send a channel information measurement result, and the PPDU further comprises a mode indication field, wherein the mode indication field is used for indicating a mode of a sounding PPDU used by the network equipment to measure channel information;

a sending unit 1902, configured to send the PPDU to a target network device, where the PPDU is used by the target network device to determine a target channel information measurement result according to the mode indication field, and perform link adaptive adjustment according to the target channel information measurement result.

Optionally, in this embodiment, the channel information includes a signal-to-noise ratio SNR of the channel;

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 system, apparatus and method may be implemented in other manners. 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 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 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.

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 may be embodied in the form of a software product, which is stored in a storage medium and includes 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: a U-disk, a removable hard disk, a Read-only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.

The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. A method for link adaptation in a W L AN, comprising:

a first network device receives a physical layer protocol data unit (PPDU) sent by a second network device; the PPDU comprises information indicating that the second network device actively sends a channel information measurement result, and a mode indication field, where the mode indication field is used to indicate a mode of a target sounding PPDU used by the second network device to measure channel information, and the PPDU further comprises the channel information measurement result;

the first network equipment acquires the channel information measurement result, wherein the channel information measurement result is obtained by the second network equipment according to the target detection PPDU measurement;

and the first network equipment performs link self-adaptive adjustment according to the channel information measurement result.

2. The method of claim 1, wherein the channel information measurement results comprise: a proposed number of space-time streams, a proposed modulation and coding scheme, MCS, and a bandwidth employed by the proposed MCS.

3. The method of claim 1, wherein the instructing the second network device to actively send the information of the channel information measurement result specifically comprises: the Unsolicited MCS feedback in the PPDU directs an unoiled MFB field to set 1, indicating that the second network device actively sends the channel information measurement result.

4. The method of claim 1, wherein the PPDU further comprises a bandwidth BW field for indicating a bandwidth of the target sounding PPDU.

5. The link adaptation method of the W L AN of claim 1, wherein the mode of the sounding PPDU comprises at least one of whether the sounding PPDU employs AN indoor mode or AN outdoor mode, fourier transform order information of a long training field of the sounding PPDU, and guard interval information of the sounding PPDU.

6. The link adaptation method of W L AN according to any one of claims 1 to 5, wherein the channel information includes AN extended delay of a channel and/or a delay between multiple users;

the first network device performing link adaptive adjustment according to the channel information measurement result includes:

and the first network equipment performs self-adaptive adjustment of the guard interval according to the channel information measurement result.

7. The link adaptation method of W L AN according to any one of claims 1 to 5,

and the first network equipment carries out the self-adaptive adjustment of the modulation and coding strategy MCS according to the channel information measurement result.

8. A method for link adaptation in a W L AN, comprising:

the second network equipment receives a physical layer protocol data unit (PPDU) sent by the first network equipment; wherein the PPDU indicates that the second network device needs to send a sounding PPDU, and the PPDU further includes a mode indication field, and the mode indication field is used for indicating the second network device to generate a sounding PPDU of a target mode;

and the second network equipment sends the detection PPDU in the target mode to the first network equipment, wherein the detection PPDU in the target mode is used for the first network equipment to measure channel information by using the detection PPDU in the target mode to obtain a channel information measurement result, and performs link self-adaptive adjustment according to the channel information measurement result.

9. The link adaptation method of a W L AN of claim 8, wherein the mode of the sounding PPDU comprises at least one of bandwidth information of the sounding PPDU, whether the sounding PPDU employs AN indoor mode or AN outdoor mode, fourier change order information of a long training field of the sounding PPDU, and guard interval information of the sounding PPDU.

10. The link adaptation method of the W L AN of claim 8, wherein the mode of the sounding PPDU includes whether the sounding PPDU employs AN indoor mode or AN outdoor mode;

when the mode indication field indicates that the second network device generates a sounding PPDU in an outdoor mode, the second network device generating a sounding PPDU in a target mode according to the mode indication field includes:

11. The link adaptation method of W L AN according to any one of claims 8 to 10, wherein the channel information includes AN extended delay of a channel and/or a delay between multiple users;

and the target mode sounding PPDU is used for the first network equipment to measure the extension delay of the channel and/or the delay among multiple users by using the target mode sounding PPDU, and to perform the self-adaptive adjustment of the guard interval according to the measured extension delay of the channel and/or the delay among multiple users.

12. The method of any one of claims 8 to 10, wherein the channel information measurement result comprises: a proposed number of space-time streams, a proposed modulation and coding scheme, MCS, and a bandwidth employed by the proposed MCS.

13. A method for link adaptation in a W L AN, comprising:

the second network equipment generates a physical layer protocol data unit PPDU; the PPDU comprises information indicating that the second network equipment actively sends a channel information measurement result, and further comprises a mode indication field, wherein the mode indication field is used for indicating a mode of a target sounding PPDU used by the second network equipment for measuring the channel information;

and the second network equipment sends the PPDU to the first network equipment, wherein the PPDU comprises the channel information measurement result, the channel information measurement result is obtained by the second network equipment according to the measurement of the target detection PPDU, and the channel information measurement result is used for the first network equipment to carry out link self-adaptive adjustment.

14. The method of claim 13, wherein the channel information measurement result comprises: a proposed number of space-time streams, a proposed modulation and coding scheme, MCS, and a bandwidth employed by the proposed MCS.

15. The method of claim 13, wherein the information instructing the second network device to actively send channel information measurement results comprises: and setting 1 in an unoiled MFB field in the PPDU, and indicating the second network equipment to actively send the channel information measurement result.

16. The method of claim 13, wherein the PPDU further comprises a BW field for indicating a bandwidth of the target sounding PPDU.

17. The link adaptation method of a W L AN of claim 13, wherein the mode of the sounding PPDU comprises at least one of whether the sounding PPDU employs AN indoor mode or AN outdoor mode, fourier transform order information of a long training field of the sounding PPDU, and guard interval information of the sounding PPDU.

18. The link adaptation method of W L AN of claim 13, wherein the channel information includes AN extended delay of a channel and/or a delay between multiple users;

and the PPDU is used for the first network equipment to determine a channel information measurement result according to the mode indication field and to perform self-adaptive adjustment of a guard interval according to the channel information measurement result.

19. The link adaptation method of W L AN of claim 13, wherein the PPDU is used by the first network device to determine a channel information measurement result according to the mode indication field and to perform adaptive adjustment of MCS according to the channel information measurement result.

20. A network device, comprising:

the receiving module is used for receiving a physical layer protocol data unit PPDU sent by target network equipment; the PPDU includes information indicating that the target network device actively sends a channel information measurement result, and a mode indication field, where the mode indication field is used to indicate a mode of a target sounding PPDU used by the target network device to measure channel information, and the PPDU also includes the channel information measurement result;

an obtaining module, configured to obtain the channel information measurement result, where the channel information measurement result is obtained by the target network device according to the target sounding PPDU;

and the adjusting unit is used for carrying out link self-adaptive adjustment according to the channel information measurement result.

21. The network device of claim 20, wherein the channel information measurement results comprise: a proposed number of space-time streams, a proposed modulation and coding scheme, MCS, and a bandwidth employed by the proposed MCS.

22. The network device of claim 20, wherein the information instructing the target network device to actively send the channel information measurement result specifically comprises: the unsolicited MCS feedback in the PPDU directs the UnsulcittedMFB field to set 1, indicating that the target network device is actively sending the channel information measurement result.

23. The network device of claim 20, wherein the PPDU further comprises a bandwidth BW field for indicating a bandwidth of the targeted sounding PPDU.

24. The network device of claim 20, wherein the mode of the sounding PPDU comprises at least one of whether the sounding PPDU employs an indoor mode or an outdoor mode, fourier transform order information of a long training field of the sounding PPDU, and guard interval information of the sounding PPDU.

25. The network device according to any of claims 20 to 24, wherein the channel information comprises an extension delay of a channel and/or a delay between multiple users;

the adjusting unit is specifically configured to perform adaptive adjustment of a guard interval according to the channel information measurement result.

26. The network device according to one of claims 20 to 24, wherein the adjusting unit is specifically configured to perform adaptive adjustment of a modulation and coding scheme, MCS, according to the channel information measurement result.

27. A network device, comprising:

a receiving unit, configured to receive a physical layer protocol data unit PPDU sent by a target network device; the PPDU indicates that the network equipment needs to send a sounding PPDU, and the PPDU further comprises a mode indication field, wherein the mode indication field is used for indicating the network equipment to generate a sounding PPDU in a target mode;

and a sending unit, configured to send the sounding PPDU in the target mode to the target network device, where the sounding PPDU in the target mode is used by the target network device to measure channel information using the sounding PPDU in the target mode to obtain a channel information measurement result, and perform link adaptive adjustment according to the channel information measurement result.

28. The network device of claim 27, wherein the mode of the sounding PPDU comprises at least one of bandwidth information of the sounding PPDU, whether the sounding PPDU employs an indoor mode or an outdoor mode, fourier transform order information of a long training field of the sounding PPDU, and guard interval information of the sounding PPDU.

29. The network device of claim 27, wherein the mode of the sounding PPDU comprises whether the sounding PPDU employs an indoor mode or an outdoor mode;

30. The network device according to any of claims 27 to 29, wherein the channel information comprises an extension delay of a channel and/or a delay between multiple users;

the target mode of the sounding PPDU is used for the target network device to measure the extension delay of the channel and/or the delay among multiple users by using the target mode of the sounding PPDU, and the self-adaptive adjustment of the guard interval is carried out according to the measured extension delay of the channel and/or the delay among multiple users.

31. The network device of any of claims 27 to 29, wherein the channel information measurement result comprises: a proposed number of space-time streams, a proposed modulation and coding scheme, MCS, and a bandwidth employed by the proposed MCS.

32. A network device, comprising:

a generating unit, configured to generate a physical layer protocol data unit PPDU; the PPDU comprises information indicating that the network equipment actively sends a channel information measurement result, and further comprises a mode indication field, wherein the mode indication field is used for indicating a mode of a target sounding PPDU used by the network equipment for measuring the channel information;

a sending unit, configured to send the PPDU to a target network device, where the PPDU includes the channel information measurement result, the channel information measurement result is obtained by the network device according to the target sounding PPDU, and the channel information measurement result is used for performing link adaptive adjustment by the target network device.

33. The network device of claim 32, wherein the channel information measurement result comprises: a proposed number of space-time streams, a proposed modulation and coding scheme, MCS, and a bandwidth employed by the proposed MCS.

34. The network device of claim 32, wherein the information instructing the network device to actively send channel information measurements comprises: and setting 1 in an unoiled MFB field in the PPDU, and indicating the network equipment to actively send a channel information measurement result.

35. The network device of claim 32, wherein the PPDU further comprises a BW field indicating a bandwidth of the targeted sounding PPDU.

36. The network device of claim 32, wherein the mode of the sounding PPDU comprises at least one of whether the sounding PPDU employs an indoor mode or an outdoor mode, fourier transform order information of a long training field of the sounding PPDU, and guard interval information of the sounding PPDU.

37. The network device of claim 32, wherein the channel information comprises an extended delay of a channel and/or a delay between multiple users;

and the PPDU is used for the target network equipment to determine a channel information measurement result according to the mode indication field and to perform self-adaptive adjustment of a guard interval according to the channel information measurement result.

38. The network device of claim 32, wherein the PPDU is configured for the target network device to determine a channel information measurement result according to the mode indication field and to perform adaptive adjustment of an MCS according to the channel information measurement result.