CN115243326A

CN115243326A - Bandwidth indication method, device and related equipment

Info

Publication number: CN115243326A
Application number: CN202110437542.5A
Authority: CN
Inventors: 于健; 狐梦实; 刘辰辰; 淦明
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2021-04-22
Filing date: 2021-04-22
Publication date: 2022-10-25
Also published as: WO2022222873A1

Abstract

The embodiment of the application provides a bandwidth indication method, a bandwidth indication device and related equipment. When three or more than three TB PPDUs are transmitted in an aggregation mode, the access point indicates the bandwidth information or indicates the aggregation bandwidth information or indicates the combination of the aggregation bandwidths to three or more than three sites, so that the access point can schedule three or more than three TB PPDUs which are sent simultaneously, and the large bandwidth capacity of the access point can be better utilized.

Description

Bandwidth indication method, device and related equipment

Technical Field

The present application relates to the field of communications technologies, and in particular, to a bandwidth indication method, apparatus, and related device.

Background

During data communication, an Access Point (AP) and a Station (STA) may select different physical layer protocol data unit (PPDU) bandwidths according to a channel condition to transmit. Generally, the STA acquires a transmission right through channel contention and then performs uplink data transmission.

With the evolution of Wireless Local Area Network (WLAN) standards, the 802.11ax standard further introduces scheduled uplink transmission based on trigger frames. For example, the AP sends a trigger frame, where the trigger frame includes resource scheduling and other parameters for one or more STAs to send a high efficiency trigger based PHY protocol data unit (HE TB PPDU). After receiving the trigger frame, the STA transmits the HE TB PPDU on a Resource Unit (RU) indicated by the trigger frame.

However, there is no corresponding specification in the current standard for how multiple PPDUs (e.g., multiple HE TB PPDUs), or more flexible PPDU combinations (e.g., the HE TB PPDU and an ultra High Throughput trigger based physical layer protocol data unit (EHTTB PPDU)) indicate the bandwidth.

Disclosure of Invention

The embodiment of the application provides a bandwidth indication method, a bandwidth indication device and related equipment. The bandwidth indication method realizes the indication of a plurality of bandwidth information when a plurality of TB PPDUs are transmitted in a polymerization way, and is beneficial to an access point to schedule three or more than three TB PPDUs which are simultaneously transmitted, thereby better utilizing the large bandwidth capability of the access point.

In a first aspect, an embodiment of the present application provides a bandwidth indication method, where the method is performed by a station. The station receives indication information from an access point, wherein the indication information is used for indicating bandwidth information of three or more trigger-based physical layer protocol data units (TB PPDUs). Wherein the three or more TB PPDUs may be any combination of HE TB PPDUs, EHTTB PPDUs, or evolved EHTTB PPDUs. And after receiving the indication information, the station determines the bandwidth information of the TB PPDU corresponding to the station, and sends the TB PPDU to the access point on the bandwidth of the TB PPDU corresponding to the station. Therefore, the bandwidth indicating method realizes indicating a plurality of bandwidth information when a plurality of TB PPDUs are transmitted in a polymerization manner, and is beneficial to an access point to schedule three or more than three TB PPDUs which are simultaneously transmitted, thereby being beneficial to utilizing the large bandwidth capability of the access point.

In one possible design, the indication information is used to indicate bandwidth information of two TB PPDUs. Wherein the two TB PPDUs are two HE TB PPDUs, or two EHTTB PPDUs, or two evolved EHTTB PPDUs, or one EHTTB PPDU and one evolved EHTTB PPDU. It can be seen that the indication information received by the station may also schedule two TB PPDUs of the same type, or schedule one EHTTB PPDU and one evolved EHTTB PPDU, thereby facilitating utilization of the large bandwidth capability of the access point.

In one possible design, the number of indication information is plural. The indication information is carried in the aggregation trigger frame. The aggregation trigger frame comprises a plurality of trigger frames, and one trigger frame carries one indication message. As can be seen, a plurality of bandwidth information may be carried in a plurality of different trigger frames, and a station may receive corresponding bandwidth information on a bandwidth resource negotiated in advance.

In one possible design, the number of indication information is plural. The indication information is carried in one trigger frame or a plurality of trigger frames. The multiple trigger frames are obtained by copying the same trigger frame in different frequency domain ranges. It can be seen that multiple pieces of bandwidth information may be carried in one trigger frame, or multiple pieces of bandwidth information may be carried in multiple same trigger frames.

In one possible design, the indication information is used to indicate at least one of the following information: bandwidth information of a TB PPDU, aggregation bandwidth information of aggregation physical layer protocol data units (TB A-PPDUs) based on triggering, or bandwidth combination information of each PPDU in the TB A-PPDUs. As can be seen, the indication information may indicate the bandwidth information of the multiple TB PPDUs in a variety of different manners.

In one possible design, the indication information is carried in at least one of the following fields of the trigger frame: a first field and a second field. The first field is an uplink bandwidth field of the trigger frame, or the uplink bandwidth field and an uplink bandwidth extension field. The second field is a reserved field of the trigger frame. The reserved field of the trigger frame is any one of the following fields: the system comprises an uplink high-efficiency reserved field of a public information field, a reserved field of the public information field, an uplink general signaling reserved field of a special user information field and a reserved field of the special user information field.

In one possible design, some or all of the bits in at least one of the uplink bandwidth field and the uplink bandwidth extension field of the trigger frame are used to indicate at least one of the three types of bandwidth information described in the above possible design.

In one possible design, some or all of the reserved bits in at least one of the common information field and the special user information field of the trigger frame are used to indicate at least one of the three types of bandwidth information described in the above possible design.

In one possible design, a trigger frame includes a plurality of special user fields, one special user field to indicate the bandwidth of one TB PPDU.

In one possible design, the station generates a very high throughput long training EHT-LTF sequence based on the indication information and transmits the EHT-LTF sequence to the access point. Therefore, the station generates different EHT-LTF sequences based on the bandwidth information of a plurality of TB PPDUs, which is beneficial to optimizing the peak-to-average power ratio under different bandwidth conditions.

In one possible design, a station generates an EHT-LTF sequence based on one or more of bandwidth information of a TB PPDU, aggregated bandwidth information of the TB a-PPDU, or bandwidth combination information of individual PPDUs in the TB a-PPDU.

In a second aspect, embodiments of the present application provide another bandwidth indication method, which is performed by an access point. The access point generates indication information, and the indication information is used for indicating the bandwidth information of three or more trigger-based physical layer protocol data units (TB PPDUs). Wherein the three or more TB PPDUs may be any combination of HE TB PPDUs, EHTTB PPDUs, or evolved EHTTB PPDUs. The access point sends indication information to the station. It can be seen that the access point may schedule three or more simultaneously transmitted TB PPDUs using the indication information, thereby better utilizing the large bandwidth capability of the access point.

In one possible design, the indication information is used to indicate bandwidth information of two TB PPDUs. Wherein, the two TB PPDUs are two HE TB PPDUs, or two EHTTB PPDUs, or two evolved EHTTB PPDUs, or one EHTTB PPDU and one evolved EHTTB PPDU. It can be seen that the access point may also schedule two TB PPDUs of the same type, or schedule one EHTTB PPDU and one EHTTB PPDU, through the indication information in this embodiment, so as to better utilize the large bandwidth capability of the access point.

In one possible design, the number of indication information is plural. The indication information is carried in the aggregation trigger frame. The aggregation trigger frame comprises a plurality of trigger frames, and one trigger frame carries one indication message. It can be seen that the access point can transmit a number of different trigger frames within different channel bandwidths.

In one possible design, the number of indication information is plural. The indication information is carried in one trigger frame or a plurality of trigger frames. The multiple trigger frames are obtained by copying the same trigger frame in different frequency domain ranges. It can be seen that the access point only sends one trigger frame, or the trigger frame sent by the access point performs duplicate transmission in different channel bandwidths.

In one possible design, the indication information is used to indicate one or more of bandwidth information of the TB PPDU, aggregated bandwidth information of a trigger-based aggregated physical layer protocol data unit TB a-PPDU, or bandwidth combination information of individual PPDUs in the TB a-PPDU. As can be seen, the indication information may indicate the bandwidth information of the multiple TB PPDUs in a variety of different manners.

In one possible design, some or all bits of at least one of the uplink bandwidth field and the uplink bandwidth extension field of the trigger frame are used to indicate at least one of the three types of bandwidth information described in the above possible design.

In one possible design, the access point determines an EHT-LTF sequence for channel estimation according to the indication information and performs channel estimation using the corresponding EHT-LTF sequence.

In a third aspect, an embodiment of the present application provides a bandwidth indicating device. The bandwidth indicating device comprises a transceiving unit and a processing unit. The transceiver unit is used for receiving indication information from the access point. The indication information is used for indicating the bandwidth information of three or more trigger-based physical layer protocol data units (TB PPDUs). Wherein, the three or more TB PPDUs comprise one or more of a high-efficiency trigger-based physical layer protocol data unit, a very high throughput trigger-based physical layer protocol data unit, and an evolved very high throughput trigger-based physical layer protocol data unit. The processing unit is used for determining bandwidth information of a TB PPDU corresponding to the station. The transceiver unit is further configured to send the TB PPDU to the access point on a bandwidth of the TB PPDU corresponding to the station.

In one possible design, the number of indication information is plural. The indication information is carried in the aggregation trigger frame. The aggregation trigger frame comprises a plurality of trigger frames, and one trigger frame carries one indication message.

In one possible design, the number of indication information is plural. The indication information is carried in one trigger frame or a plurality of trigger frames. The multiple trigger frames are obtained by copying the same trigger frame in different frequency domain ranges.

In one possible design, the indication information is used to indicate bandwidth information of three or more trigger-based physical layer protocol data units, TB PPDUs, and includes:

the indication information is used for indicating one or more of bandwidth information of a TB PPDU, aggregation bandwidth information of a trigger-based aggregation physical layer protocol data unit (TB A-PPDU) or bandwidth combination information of each PPDU in the TB A-PPDU.

In one possible design, the indication information is carried in at least one of the following fields of the trigger frame: a first field and a second field. The first field is an uplink bandwidth field of the trigger frame, or the uplink bandwidth field and an uplink bandwidth extension field. The second field is a reserved field of the trigger frame. The reserved field of the trigger frame is any one of the following fields: the system comprises an uplink efficient reserved field of a public information field, a reserved field of the public information field, an uplink general signaling reserved field of a special user information field and a reserved field of the special user information field.

In one possible design, part or all of the bits of at least one of the uplink bandwidth field and the uplink bandwidth extension field of the trigger frame are used to indicate at least one of the three types of bandwidth information described in the above possible design.

In one possible design, one trigger frame includes a plurality of special user fields, each for indicating a bandwidth of one TB PPDU.

In one possible design, the processing unit is further to generate a very high throughput long training EHT-LTF sequence based on the indication information. The transceiver unit is further configured to transmit the EHT-LTF sequence to the access point.

In one possible design, the processing unit is further configured to generate an EHT-LTF sequence based on the indication information, including:

and generating an EHT-LTF sequence based on one or more of bandwidth information of the TB PPDU, aggregated bandwidth information of the TB A-PPDU or bandwidth combination information of each PPDU in the TB A-PPDU.

In a fourth aspect, embodiments of the present application provide another bandwidth indicating device. The bandwidth indicating device comprises a processing unit and a transceiving unit. The processing unit is used for generating indication information. The indication information is used for indicating the bandwidth information of three or more trigger-based physical layer protocol data units (TB PPDUs). The three or more TB PPDUs include one or more of an efficient trigger-based physical layer protocol data unit, a very high throughput trigger-based physical layer protocol data unit, and an evolved very high throughput trigger-based physical layer protocol data unit. The transceiver unit is used for sending the indication information to the station.

the indication information is used for indicating one or more of bandwidth information of a TB PPDU, aggregation bandwidth information of a triggered aggregation physical layer protocol data unit (TB A-PPDU) or bandwidth combination information of each PPDU in the TB A-PPDU.

In one possible design, a trigger frame includes a plurality of special user fields, each for indicating a bandwidth of a TB PPDU.

In one possible design, the transceiver unit is further configured to receive an EHT-LTF sequence from a station. The processing unit is further configured to perform channel estimation based on the EHT-LTF sequence, the EHT-LTF sequence being determined by the indication information.

In a fifth aspect, an embodiment of the present application provides a station, where the device has a function of implementing the bandwidth indication method provided in the first aspect. The function can be realized by hardware, and can also be realized by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the functions described above.

In a sixth aspect, an embodiment of the present application provides an access point, where the device has a function of implementing the bandwidth indication method provided in the second aspect. The function can be realized by hardware, and can also be realized by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the functions described above.

In a seventh aspect, the present embodiment further provides a communication system, where the system includes the station according to the fifth aspect and the access point according to the sixth aspect.

In an eighth aspect, embodiments of the present application provide a computer-readable storage medium including a program or instructions. When the program or instructions are run on a computer, the computer is caused to perform the method of any one of the possible implementations of the first or second aspect.

In a ninth aspect, embodiments of the present application provide a chip or a chip system, where the chip or the chip system includes at least one processor and an interface. The interface and the at least one processor are interconnected by a line, and the at least one processor is configured to execute a computer program or instructions to perform the method described in any one of the possible implementations of the first or second aspect.

The interface in the chip may be an input or output interface, a pin or a circuit, or the like.

The system-on-chip in the above aspect may be a system-on-chip (SOC), a baseband chip, or the like. Wherein the baseband chip may include a processor, a channel encoder, a digital signal processor, a modem, an interface module, and the like.

In one possible implementation, the chip or chip system described above in this application further comprises at least one memory having instructions stored therein. The memory may be a storage unit inside the chip, such as a register, a cache, etc., or may be a storage unit of the chip (e.g., a read-only memory, a random access memory, etc.).

In a tenth aspect, embodiments of the present application provide a computer program or computer program product comprising code or instructions. The code or instructions, when executed on a computer, cause the computer to perform the method of any one of the possible implementations of the first or second aspect.

Drawings

FIG. 1 is a schematic diagram of a trigger frame structure defined by 802.11 ax;

fig. 2 is a schematic diagram of a communication system according to an embodiment of the present application;

FIG. 3 is a schematic diagram of channel division of 80MHz or 160MHz or 320MHz bandwidth in 6GHz band;

FIG. 4 is a diagram illustrating a trigger frame structure defined by 802.11 be;

fig. 5 is a schematic flowchart of a bandwidth indication method according to an embodiment of the present application;

fig. 6 is a schematic diagram of a first aggregation trigger frame and an aggregation PPDU according to an embodiment of the present application;

fig. 7a is a schematic flowchart of an aggregation trigger frame and aggregated PPDU transmission between an AP and an STA according to a first embodiment of the present application;

fig. 7b is a schematic flowchart of an aggregation trigger frame and an aggregation PPDU transmission between a second AP and a STA according to an embodiment of the present disclosure;

fig. 8a is a schematic diagram of a second aggregation trigger frame and an aggregation PPDU according to an embodiment of the present application;

fig. 8b is a schematic diagram of a third aggregation trigger frame and an aggregation PPDU according to an embodiment of the present application;

fig. 9 is a schematic diagram of a fourth aggregation trigger frame and an aggregation PPDU according to an embodiment of the present application;

FIG. 10 is a diagram illustrating an improved trigger frame structure according to an embodiment of the present application;

fig. 11 is a schematic diagram of a bandwidth indicating device according to an embodiment of the present application;

fig. 12 is a schematic diagram of a station provided in an embodiment of the present application;

fig. 13 is a schematic diagram of another bandwidth indicating device provided in the embodiment of the present application;

fig. 14 is a schematic diagram of another access point according to an embodiment of the present application.

Detailed Description

In the embodiments of the present application, the words "exemplary" or "such as" are used herein to mean serving as an example, instance, or illustration. Any embodiment or design described herein as "exemplary" or "e.g.," is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, use of the word "exemplary" or "such as" is intended to present relevant concepts in a concrete fashion.

In the embodiments of the present application, the terms "second", "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "second" or "first" may explicitly or implicitly include one or more of that feature.

In embodiments of the present application, the term "plurality" means two or three and more, for example, a plurality of trigger frames means two or three and more trigger frames.

It is to be understood that the terminology used in the description of the various described examples herein is for the purpose of describing particular examples only and is not intended to be limiting. As used in the description of the various described examples and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

It should be understood that, in the embodiments of the present application, the size of the serial number of each process does not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.

The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.

The protocol standards for Wireless Local Area Networks (WLANs) start with 802.11a, 802.11b, 802.11g and go through 802.11n, 802.11ac, 802.11ax to 802.11be in question. The 802.11ax standard is called a High Efficiency (HE) version, and a bandwidth of a maximum supported physical layer protocol data unit (PPDU) is 160MHz. The 802.11be standard is referred to as the Extra High Throughput (EHT) version, and the maximum supported PPDU has a bandwidth of 320MHz. The standard after 802.11be may be referred to as an evolved (future) very high throughput version, denoted by EHT +, such as to refer to the 802.11bx standard, the 802.11cx standard. The evolved very high throughput rate trigger-based physical layer protocol data unit EHT + TB PPDU in the present application corresponds to a trigger-based physical layer protocol data unit corresponding to a standard after 802.11be.

When an Access Point (AP) and a Station (STA) perform data communication, different physical layer protocol data unit (PPDU) bandwidths may be selected according to a channel condition for transmission. Generally, the STA acquires a transmission right through channel contention and then performs uplink data transmission. The 802.11ax standard further introduces a Trigger Frame (TF) -based scheduled uplink transmission. For example, the AP sends a trigger frame, where the trigger frame includes resource scheduling and other parameters for one or more STAs to send a high efficiency trigger based PHY protocol data unit (HE TB PPDU). After receiving the trigger frame, the STA transmits the HE TB PPDU on a Resource Unit (RU) indicated by the trigger frame.

The structure of the trigger frame defined by the 802.11ax standard is shown in fig. 1. The trigger frame includes a common information (common information) field and a user information list (user information) field. The specific contents of the public information field and the user information field are shown in fig. 1. Wherein the common information field contains common information that all STAs need to read. An uplink bandwidth (uplink bandwidth) field in the common information field indicates the bandwidth of the HE TB PPDU triggered by the trigger frame. The upstream bandwidth field is represented by two bits (bit). Where 00 is 20 megahertz (MHz), 01 is 40MHz,10 is 80MHz, and 11 is 160MHz or 80MHz +80MHz. Wherein 80MHz +80MHz represents two 80MHz discontinuity cases. The user information list field includes one or more user information fields, each of which contains information that different STAs respectively need to read. In the user information field, association identification (association identification 12, AID12, lower 12 bits indicating AID) indicates a station identification of one STA. A resource unit allocation (RU allocation) field is used to indicate the location of a resource unit to which an STA (i.e., the STA indicated by AID 12) is allocated.

After receiving the trigger frame, the STA analyzes a user information field matched with its AID from the trigger frame. Then, the STA transmits the HE TB PPDU on the RU indicated by the resource unit allocation field in the user information field matching its AID. The names and roles of the various fields of the HE TB PPDU can be shown in Table 1.

Table 1: field list in HE TB PPDU

Ext> whereinext>,ext> inext> anext> HEext> -ext> SIGext> -ext> Aext> fieldext> ofext> theext> HEext> TBext> PPDUext>,ext> aext> bandwidthext> fieldext> existsext>.ext> The bandwidth field is used to indicate the bandwidth of the HE TB PPDU. This bandwidth field is also typically represented with 2 bits, and its content and meaning are the same as the UL BW field in the trigger frame.

However, the transmission flow between the AP and the STA just described includes only how the trigger frame indicates the bandwidth of one TB PPDU. There is no corresponding specification in the current standard for how multiple TB PPDUs (also referred to as aggregate PPDUs, a-PPDUs) indicate bandwidth.

In order to solve the foregoing problem, an embodiment of the present application provides a bandwidth indication method. The bandwidth indication method realizes the indication of a plurality of bandwidth information when a plurality of TB PPDUs are transmitted in a polymerization way, is beneficial to an access point to schedule three or more than three TB PPDUs which are simultaneously transmitted, and is further beneficial to utilizing the large bandwidth capability of the access point.

The bandwidth indication method provided by the embodiment of the application is applied to the communication system shown in fig. 2. The communication system includes an AP and a STA. The AP is a creator of a network and is a central node of the network. For example, a wireless router used in a general home or office is an AP. The AP also includes devices such as communication servers, switches, bridges, etc. Each terminal connected to a wireless network (e.g., a laptop, a Personal Digital Assistant (PDA), a smart phone, or other network-enabled user equipment) may be referred to as an STA. The communication system shown in fig. 2 includes two APs and three STAs, which is only an example and is not limited in this embodiment. The bandwidth indication method provided in the embodiment of the present application is suitable for data communication between an AP and an STA (e.g., access point 1 and station 1 in fig. 2), is also suitable for data communication between an AP and an AP (e.g., access point 1 and access point 2 in fig. 2), and is also suitable for data communication between an STA and an STA (e.g., station 2 and station 3 in fig. 2). The communication between the AP and the STA, the AP and the AP, and the STA may also be one-to-many communication. For example, the AP, STA1, STA2, and STA3 shown in fig. 2 may be one or more devices, respectively, and the embodiment is not limited thereto.

The following describes related concepts related to embodiments of the present application.

Fig. 3 is a schematic diagram of channel division of 80MHz or 160MHz or 320MHz bandwidth in 6GHz band. Wherein UNII denotes the unlicensed international information infrastructure radio band (unlicensed radio band). Wherein the STA may park on a channel location or frequency range as shown in fig. 3 and receive the indication information based on the parked channel location or frequency range. Among them, 802.11be designs two 320MHz channels for effective channel utilization. Two 320MHz channels include: 320MHz-1 channels centered at 31MHz or 95MHz or 159MHz, and 320MHz-2 channels centered at 63MHz or 127MHz or 191MHz, as shown in FIG. 3.

802.11be follows the trigger-based transmission in 802.11 ax. The trigger frame of 802.11be multiplexes the trigger frame type and subtype of 802.11ax, and can be received and understood by the HE STA and the EHT STA simultaneously. Fig. 4 is a schematic diagram of a trigger frame structure defined by 802.11be. One special user information field in the user information list field of the trigger frame shown in fig. 4 is used to carry bandwidth information of the uplink EHT. Wherein the special user information field does not carry user information. The association identification AID12 in the special user information field is an indication of the special user information field.

The uplink EHT bandwidth field of the special user information field in fig. 4 is also referred to as an uplink bandwidth extension field. The uplink bandwidth extension field is used for indicating the bandwidth of the EHT TB PPDU jointly with the uplink bandwidth field in the common information field. Wherein, the uplink bandwidth field may also be used to indicate the bandwidth of the HE TB PPDU at the same time, as shown in table 2.

Table 2: uplink bandwidth field and uplink bandwidth extension field list

Wherein the first column of table 2 represents the upstream bandwidth field, which is represented by 2 bits. The values in the first column are the values of the upstream bandwidth field. The second column of table 2 represents the bandwidth of the HE TB PPDU, which is indicated by 2 bits of the first column. That is, when the trigger frame is used only for scheduling the HE TB PPDU, the STA determines a bandwidth of the HE TB PPDU according to the first column. Note that the values in table 2 are decimal. For example, the value in the second row and first column of table 2 is 0 (binary representation of 2 bits is 00). The 2 bits in the second row and the first column indicate that the bandwidth of the HE TB PPDU is 20MHz. As another example, the value in the sixth row and first column of Table 2 is 1 (the binary representation of 2 bits is 01). The 2bit in the sixth row and the first column indicates that the bandwidth of the HE TB PPDU is 40MHz.

Wherein the third column of table 2 represents the upstream bandwidth extension field, which is also represented by 2 bits. The value in the third column is the value of the upstream bandwidth extension field. The fourth column of table 2 represents the bandwidth of the EHT TB PPDU, which is indicated by both the 2 bits of the first column and the 2 bits of the third column. That is, when the trigger frame is used only to schedule the EHT TB PPDU, the STA determines the bandwidth of the EHT TB PPDU according to the first and third columns. For example, the value in the first column of the second row of table 2 is 0 (binary representation of 2 bits is 00) and the value in the third column of the second row is 0 ((binary representation of 2 bits is 00)). The 2 bits in the first column of the second row and the 2 bits in the third column of the second row together indicate that the bandwidth of the EHT TB PPDU is 20MHz.

The special user information field includes other fields besides the uplink bandwidth extension field as shown in fig. 4. The AID12 association flag is a special value 2007, which indicates that the field in the user information list is a special user information field. The physical layer version identification field is used to indicate which generation of the trigger frame is the EHT or later standard. For example, 0 represents EHT,1 represents 11bx, and 2 represents 11 cx. An uplink EHT spatial multiplexing 1 field and an uplink EHT spatial multiplexing 2 field, which are used to indicate a spatial multiplexing field in a universal signaling field (U-SIG) in an EHT PPDU. And the U-SIG reserved bit field is used for indicating the reserved bit in the U-SIG.

The common information field includes other fields besides the uplink bandwidth field as shown in fig. 4. Ext> theext> uplinkext> spatialext> multiplexingext> fieldext> isext> usedext> forext> indicatingext> theext> spatialext> multiplexingext> fieldext> inext> theext> HEext> -ext> SIGext> -ext> Aext> inext> theext> HEext> PPDUext>.ext> Ext> andext> theext> uplinkext> HEext> -ext> SIGext> -ext> Aext> 2ext> reservedext> fieldext> isext> usedext> forext> indicatingext> reservedext> bitsext> inext> HEext> -ext> SIGext> -ext> Aext> 2ext> (ext> theext> secondext> symbolext> ofext> theext> HEext> -ext> SIGext> -ext> Aext>)ext> inext> theext> HEext> PPDUext>.ext> Wherein, the uplink HE-SIG-A2 reserved field redefines HE or EHT indication bit (common field b 54) and special user information field existence indication bit (common field b 55). The HE or EHT indication bit is used to indicate whether HE TB PPDU or EHT TB PPDU is transmitted within the main 160MHz. Wherein, b54 indicates 1 to indicate that the transmission in the main 160MHz is HE TB PPDU, and b54 indicates 0 to indicate that the transmission in the main 160MHz is EHT TB PPDU. The special user information field presence indication bit is used to indicate whether a special user field is present. Where b55 indicates 1 for absence and b55 indicates 0 for presence. That is, the special user information field presence indication bit indirectly indicates whether to schedule the EHT TB PPDU (because the special user information field also indicates common information required for the EHT TB PPDU). For example, if b54 indicates 1, it means that the primary 160MHz channel is transmitting the HE TB PPDU. If b55 indicates 0, it indicates that there is a special user field, indirectly indicates that the trigger frame also schedules an EHT TB PPDU. Wherein the secondary 160MHz channel is used for transmitting EHT TB PPDUs. Other user information fields (the same length as the special user field, but different sub-fields) in the user information list field carry separate information indications for each user, and are not described herein again.

Similar to the HE TB PPDU, the EHT TB PPDU also includes a plurality of fields, each having the meaning shown in table 3.

Table 3: field meaning list in EHT TB PPDU

Wherein, in the U-SIG of the EHT TB PPDU, the bandwidth field is also present. That is, the AP indicates the bandwidth of the TB PPDU to the STA, and the STA transmits the TB PPDU according to the indicated bandwidth and carries bandwidth information in the TB PPDU. And the bandwidth value of the TB PPDU carried by the bandwidth field of the U-SIG field in the EHT TB PPDU is the same as the bandwidth value of the PPDU indicated in the trigger frame. The contents of the U-SIG field in the EHT TB PPDU are shown in Table 4. Wherein, the bandwidth field of the U-SIG field directly indicates the bandwidth of the PPDU through 3 bits, and the trigger frame jointly indicates through 2bit +2bit (for example, 2bit of the uplink bandwidth field and 2bit of the uplink bandwidth extension field shown in table 2).

Table 4: content list of U-SIG field in EHT TB PPDU

Wherein the first two bits B0-B1 of the second symbol of the U-SIG field in the EHT TB PPDU shown in Table 4 are used to indicate the PPDU type and the compressed mode. The specific meanings are shown in table 5.

Table 5: uplink or downlink field of U-SIG field in EHT TB PPDU, PPDU type and compressed mode field list

The 802.11be standard has two versions, wherein the first version only relates to some basic characteristics, and the second version further relates to some other characteristics to be determined. In order to distinguish between the two versions of devices, the first version of the device is referred to as a device that implements the basic characteristics of EHT. The second version of the device is referred to as a device that does not implement the basic characteristics of the EHT (may also be referred to as a device that implements the advanced characteristics of the EHT). The device which realizes the basic characteristics of the EHT has the characteristics of supporting 320MHz channels, supporting multiple RUs and the like, but does not support A-PPDU. The device which does not realize the basic characteristics of the EHT has the characteristics of supporting A-PPDU, AP cooperation and the like.

In addition, the states of the reserved bits (also called unused bits) of the different fields in table 4 are divided into two types, namely "distribute" and "Validate". Reception of a PPDU is terminated if a device implementing the basic features of the EHT finds that the acknowledgement bit within the PPDU is not set to the default value specified in the standard or that the values of certain subfields are set to the acknowledged state. And for the don't care bit, or the sub-fields set to don't care state, if an EHT device does not find that the ack bit is not set to the default value specified in the standard or the values of some sub-fields are set to ack state, the don't care bit is ignored, or some sub-fields set to don't care state are ignored, and the reading of other fields is continued.

Fig. 5 is a schematic flowchart of a bandwidth indication method according to an embodiment of the present application. The bandwidth indicating method is realized by interaction between an access point and a site, and comprises the following steps:

501, an access point generates indication information, wherein the indication information is used for indicating bandwidth information of a plurality of trigger-based physical layer protocol data units (TB PPDUs);

502, the access point sends indication information to the station; correspondingly, the station receives the indication information from the access point;

503, the station determines the bandwidth information of the TB PPDU corresponding to the station, and sends the TB PPDU to the access point on the bandwidth of the TB PPDU corresponding to the station.

When the AP and the STA communicate data, different PPDU bandwidths may be selected for transmission according to the channel condition. For example, the bandwidth information of the TB PPDU indicated to the STA by the AP indicates that the AP instructs the STA to transmit uplink data to the AP through a specified bandwidth. That is, the bandwidth information of the TB PPDU instructed by the AP to the STA includes a bandwidth for transmitting the TB PPDU instructed by the AP to the STA, and may include information such as a transmission resource unit allocated by the STA. Herein, the bandwidth for transmitting the TB PPDU may be understood as a transmission bandwidth or an operating bandwidth of the TB PPDU. For example, the indication information sent by the AP to the STA is used to indicate the bandwidth for the STA to send the EHT TB PPDU and indicate the resource unit used by the STA to specifically send the EHT TB PPDU on the sending bandwidth.

The indication information in this embodiment is used to indicate bandwidth information of multiple TB PPDUs, and includes the following two types of situations:

the first condition is as follows: the indication information is used to indicate bandwidth information of two TB PPDUs. Wherein, the two TB PPDUs comprise any one of the following combinations: two HE TB PPDUs, two EHT + TB PPDUs, one EHT PB PPDU, and one EHT + TB PPDU.

Case two: the indication information is used for indicating the bandwidth information of three or more TB PPDUs. Wherein, the three or more TB PPDUs comprise one or more of HE TB PPDU, EHT TB PPDU and EHT + TB PPDU.

In order to enable the indication information to indicate a combination of any one of the TB PPDUs in the first case or the second case, the indication information in this embodiment is used to indicate at least one of the following information: bandwidth information of the TB PPDU, aggregation bandwidth information of a trigger-based aggregated physical layer protocol data unit (TB a-PPDU), or a bandwidth combination of each PPDU in the TB a-PPDU. The indication information is carried in the trigger frame. That is, the access point generates the indication information, which also means that the access point generates the trigger frame, and the trigger frame carries the indication information.

In one possible implementation, the indication information is used to indicate bandwidth information of the TB PPDU. For example, the AP1 in fig. 2 generates a trigger frame and transmits the trigger frame to the STA 1. The indication information carried by the trigger frame is used for indicating the STA1 to send the bandwidth of the TB PPDU to the AP 1. That is, the indication information is used to indicate bandwidth information of a single PPDU. The trigger frame may also indicate a resource unit used by the STA to send a TB PPDU, which is not described herein again.

In yet another possible implementation manner, the indication information is used to indicate aggregate bandwidth information based on the TB a-PPDU. For example, AP1 in fig. 2 generates a trigger frame and transmits the trigger frame to STA1 and STA 2. The indication information carried by the trigger frame is used to indicate that STA1 and STA2 respectively send the aggregation bandwidth of the TB PPDU to AP 1.

In another possible implementation manner, the indication information is used to indicate bandwidth combination information of each PPDU in the TB a-PPDU. For example, AP1 in fig. 2 generates a trigger frame and transmits the trigger frame to STA1 and STA 2. The indication information carried by the trigger frame is used to indicate how much bandwidth STA1 and STA2 occupy respectively to send a TB PPDU to AP 1. That is to say, the indication information carried by the trigger frame indicates the transmission bandwidths corresponding to the transmission bandwidth of the TB PPDUs respectively transmitted by STA1 and STA 2.

The following describes the specific implementation steps of the above three implementations in detail.

In one example, the number of the indication information is multiple, and the indication information is carried in the aggregation trigger frame. The aggregation trigger frame comprises a plurality of trigger frames, and one trigger frame carries one piece of indication information. For example, when the indication information is used to indicate bandwidth information of two HE TB PPDUs in the above case one, the indication information is carried in the aggregation trigger frame. The aggregated trigger frame includes two trigger frames (e.g., trigger frame 1 and trigger frame 2 in fig. 6) that respectively indicate bandwidth information of two HE TB PPDUs, as shown in fig. 6. And the STA sends the TB PPDU1 on the corresponding bandwidth according to the bandwidth information of the HE TB PPDU1 indicated by the trigger frame 1. Similarly, the STA transmits the TB PPDU2 on a corresponding bandwidth according to the bandwidth information of the HE TB PPDU2 indicated by the trigger frame 2.

Wherein, the STA receives the indication information on the parked channel position or frequency range, and the parked channel position or frequency range is negotiated by the AP and the STA in advance. When the granularity of channel bandwidth division is 80MHz, the STA acquires the bandwidth of the TB PPDU indicated to the STA by the AP depending on the position or the frequency range of the parked 80MHz sub-block.

For example, STA1 and STA2 in fig. 2, are parked on the first and second 80MHz channels, respectively, of UNII5 as shown in fig. 3. The AP1 in fig. 2 transmits an aggregation trigger frame, which includes a trigger frame 1 and a trigger frame 2. Where trigger frame 1 and trigger frame 2 are located on the first and second 80MHz channels in UNII5, respectively. The STA1 receives the trigger frame 1, and the bandwidth indication information carried by the trigger frame 1 indicates that the bandwidth of the TB PPDU of the STA1 is 80MHz. STA1 transmits a TB PPDU1 with a bandwidth of 80MHz on the first 80MHz channel parked. The STA2 receives the trigger frame 2, and the bandwidth indication information carried by the trigger frame 2 indicates that the bandwidth of the TB PPDU of the STA2 is 80MHz. STA2 transmits a TB PPDU2 of 80MHz bandwidth on the parked second 80MHz channel.

For another example, STA1 in fig. 2 is a plurality of devices (three STA1 are assumed). These three STAs 1 land on the first, second and fourth 80MHz channels in UNII-5, respectively. AP1 sends an aggregate trigger frame that includes trigger frames 1-3. Wherein trigger frame 1 and trigger frame 2 are located on the first and second 80MHz channels, respectively, in UNII-5. Trigger frame 3 is located on the third and fourth 160MHz channels, which are 80MHz apart. Alternatively, trigger frame 3 is duplicated for transmission on the third and fourth 80MHz channels in UNII-5. The first STA1 receives the trigger frame 1, and the bandwidth indication information carried by the trigger frame 1 indicates that the bandwidth of the TB PPDU is 80MHz. The first STA1 has the capability of transmitting the TB PPDU with the bandwidth of 80MHz, and the first STA1 transmits the TB PPDU1 with the bandwidth of 80MHz on the docked first 80MHz channel. The second STA1 receives the trigger frame 2, and the bandwidth indication information carried by the trigger frame 2 indicates that the bandwidth of the TB PPDU is 80MHz. The second STA1 has the capability of transmitting a TB PPDU with a bandwidth of 80MHz, and the second STA1 transmits a TB PPDU2 with a bandwidth of 80MHz on the parked second 80MHz channel. The third STA1 receives the trigger frame 3, and the bandwidth indication information carried by the trigger frame 3 indicates that the bandwidth of the TB PPDU is 160MHz. The third STA1 has the capability of transmitting the TB PPDU with a bandwidth of 160MHz, and the third STA1 transmits a TB PPDU3 with a bandwidth of 160MHz on the parked 160MHz channel. It can be understood that, since the third STA1 stops on the fourth 80MHz channel and the bandwidth indication information carried by the trigger frame 3 received by the third STA1 indicates that the bandwidth of the TB PPDU is 160MHz, the third STA1 also has the capability of transmitting the TB PPDU with the bandwidth of 160MHz. Based on this, docking at the fourth 80MHz can be regarded as docking on the 160MHz channel, so the third STA1 can transmit the TB PPDU3 with a bandwidth of 160MHz on the docked 160MHz channel.

In a first implementation, when the trigger frame is used for scheduling a combination of TB PPDUs in case one, the transmission flow of the AP and the STA is as shown in fig. 7 a. Illustratively, the combination of TB PPDUs for case one shown in fig. 7a is a combination of two EHT TB PPDUs. Fig. 7a includes the format of an EHT TB PPDU. Wherein, the EHT TB PPDU comprises a plurality of fields, and the meaning of each field is shown in Table 3. In a second implementation manner, when the trigger frame is used for the combination of the TB PPDU in the scheduling case two, the transmission flow of the AP and the STA is as shown in fig. 7 b. Illustratively, the combination of TB PPDUs for case two shown in fig. 7b is a combination of two HE TB PPDUs and one EHT TB PPDU. FIG. 7b includes formats of HE TB PPDU and EHT TB PPDU. Wherein the HE TB PPDU comprises a plurality of fields, and the meaning of each field is shown in Table 1. The EHT TB PPDU also includes a plurality of fields, each of which has the meaning shown in table 3.

Specifically, when the AP schedules the combination of the TB PPDUs described in case 1 or case 2 through the trigger frame, the following manner may be used: the AP generates an aggregation trigger frame, and the aggregation trigger frame is used for indicating the bandwidth information of the TB A-PPDU. For example, AP1 in fig. 7a generates an aggregation trigger frame for indicating a bandwidth for STA1 to transmit TB PPDU1 and a bandwidth for STA2 to transmit TB PPDU2. For another example, AP1 in fig. 7b generates an aggregation trigger frame indicating a bandwidth for STA1 to transmit TB PPDU1, a bandwidth for STA2 to transmit TB PPDU2, and a bandwidth for STA3 to transmit TB PPDU 3. The aggregation trigger frame may also indicate the STA to send a resource unit of a TB PPDU, which is not described herein again. The structure of the aggregation trigger frame and the A-PPDU shown in FIG. 7a is shown in FIG. 8 a. Similarly, the structure of the aggregation trigger frame and A-PPDU shown in FIG. 7b is shown in FIG. 8 b. As can be seen, the aggregation trigger frame may indicate information of the aggregated PPDU.

Further, the AP transmits an aggregation trigger frame to the plurality of STAs. Correspondingly, a plurality of STAs respectively receive the aggregation trigger frame. For example, STA1 acquires indication information for STA1 in the aggregation trigger frame, the indication information being used to instruct STA1 to transmit EHT TB PPDU1 over a specified bandwidth 1. The STA2 acquires indication information for the STA2 in the aggregation trigger frame, where the indication information is used to indicate that the STA2 transmits the EHT TB PPDU2 on the specified bandwidth 2.

How to carry the bandwidth indication information in the trigger frame may include the following implementation manners: in one implementation, the bandwidth information is indicated by at least one of an uplink bandwidth field and an uplink bandwidth extension field. Further, the bandwidth information is indicated by a part or all of bits of the uplink bandwidth field. Alternatively, the bandwidth information is indicated by a part or all of bits of the uplink bandwidth field and the uplink bandwidth extension field.

In another implementation, the bandwidth information is indicated by at least one of the following fields: the system comprises an uplink efficient reserved field of a public information field, a reserved field of the public information field, an uplink general signaling reserved field of a special user information field and a reserved field of the special user information field. Further, the bandwidth information is indicated by some or all bits of the reserved field.

Specifically, the indication information is indicated by some or all of the following bits:

b56-b62 (i.e. the last 7 bits of the reserved field of the HE-SIG-A2 in uplink), b63 (i.e. the reserved bits of the reserved field) in the common information field, as shown in fig. 4.

B25-b36 (i.e. all bits of the upstream U-SIG field reservation indication), b37-b39 (i.e. reserved bits of the reserved field) in the special user information list field, as shown in fig. 4.

Note that the reserved bits described in this embodiment are bits that are temporarily unused in the standard. If the reserved bits are used to indicate the bandwidth information, the used reserved bits will not be called reserved bits any more.

For the implementation manner that the bandwidth information is indicated by part or all bits of at least one of the uplink bandwidth field and the uplink bandwidth extension field, the bandwidth information indication in the trigger frame may indicate at least one of the following information: bandwidth information of the TB PPDU, aggregated bandwidth information of the TB A-PPDU, or bandwidth combination of each PPDU in the TB A-PPDU. When the bandwidth indication is performed by using part or all bits of at least one of the uplink bandwidth field and the uplink bandwidth extension field, the following implementation manners may be specifically included:

in one possible implementation, part or all of bits of at least one of the uplink bandwidth field and the uplink bandwidth extension field indicate a bandwidth of each TB PPDU. For example, the uplink bandwidth field and the uplink bandwidth extension field of the trigger frame 1 in fig. 8a are used to indicate the bandwidth information of the TB PPDU1 of the STA1, and the uplink bandwidth field and the uplink bandwidth extension field of the trigger frame 2 are used to indicate the bandwidth information of the TB PPDU2 of the STA 2. Where STA1 receives trigger frame 1 of the aggregated trigger frame on the parked 80MHz channel. The STA1 determines that the bandwidth for transmitting the EHT TB PPDU by the STA1 is 80MHz according to the value (for example, the value is 2) of the uplink bandwidth field and the value (for example, the value is 0) of the uplink bandwidth extension field in the trigger frame 1. Similarly, STA2 receives trigger frame 2 of the aggregated trigger frame on the parked 80MHz channel. The STA2 determines that the bandwidth for transmitting the EHT TB PPDU by the STA2 is 80MHz according to the value (for example, the value is 2) of the uplink bandwidth field and the value (for example, the value is 0) of the uplink bandwidth extension field in the trigger frame 2.

For another example, the aggregation trigger frame (including three trigger frames TF1, TF2, and TF 3) in fig. 8b uses the uplink bandwidth field for bandwidth indication, or uses the uplink bandwidth field and the uplink bandwidth extension field for bandwidth indication, as shown in table 6. Wherein, the uplink bandwidth field is indicated by 2 bits, and the uplink bandwidth extension field is indicated by 2 bits, similar to table 2. Optionally, the method may further include an identifier of the trigger frame, where the identifier of the trigger frame is associated with the uplink bandwidth field and the uplink bandwidth extension field of the trigger frame. Also included in table 6 is a description of the bandwidth combination indicated by the upstream bandwidth field and the upstream bandwidth extension field.

Table 6: bandwidth indication list for aggregated trigger frames

According to the uplink bandwidth field and the uplink bandwidth extension field in table 6 and the identifier of the trigger frame, each station can determine the bandwidth for transmitting the TB PPDU. For example, STA1 receives the aggregation trigger frame on the docked 160MHz channel, and acquires trigger frame 1 corresponding to STA1 from the aggregation trigger frame. The STA1 acquires various bandwidth information indicated by the TF1 from the table 6 according to the identifier of the trigger frame 1. The STA1 determines that the bandwidth of the HE TB PPDU transmitted by the STA1 is 160MHz according to the value (for example, the value is 3) of the uplink bandwidth field of the TF 1. Similarly, STA2 and STA3 also determine the bandwidth for transmitting the TB PPDU by using the above method, which is not described herein again. In the two implementation manners, when the AP only schedules the STA to transmit the HE TB PPDU, the trigger frame sent by the AP to the STA only includes the uplink bandwidth field. Note that the AP and STA may also store table 6 in advance. After the STA acquires the trigger frame, the bandwidth indicated by the trigger frame may be acquired through the lookup table 6.

It is understood that, if the granularity of bandwidth division is 20MHz or 40MHz, the row in table 6 indicating the bandwidth as 20MHz or 40MHz may also be added with the identifier of the trigger frame. The detailed description may refer to the aforementioned 80M manner, for example, when the granularity of bandwidth division is 20MHz, the trigger frame is used to indicate that the bandwidth of a single TB PPDU is 20MHz. Lines 2 through 5 of table 6 may be added with the identification of the trigger frame.

The bandwidths indicated by the uplink bandwidth field and the uplink bandwidth extension field in table 6 may include the following situations:

example 1: and when the bit value of the uplink bandwidth field in the trigger frame is 0 and the bit value of the uplink bandwidth extension field is 0, the trigger frame is used for indicating that only the HE TB PPDU exists, and the bandwidth of the HE TB PPDU is 20MHz. Or, the trigger frame is used to indicate that only the EHT TB PPDU has a bandwidth of 20MHz.

Example 2: and when the bit value of the uplink bandwidth field in the trigger frame is 1 and the bit value of the uplink bandwidth extension field is 0, the trigger frame is used for indicating that only the HE TB PPDU exists, and the bandwidth of the HE TB PPDU is 40MHz. Or, the trigger frame is used to indicate that only the EHT TB PPDU has a bandwidth of 40MHz.

Example 3: and when the bit value of the uplink bandwidth field in the trigger frame is 2 and the bit value of the uplink bandwidth extension field is 0, the trigger frame is used for indicating that only HE TB PPDU exists, and the bandwidth of the HE TB PPDU is 80MHz. Or, the trigger frame is used to indicate that only the EHT TB PPDU has a bandwidth of 80MHz.

Example 4: and when the bit value of the uplink bandwidth field in the trigger frame is 2 and the bit value of the uplink bandwidth extension field is 1, the trigger frame is used for indicating the HE TB PPDU and the EHT TB PPDU. The bandwidth of the HE TB PPDU is 80MHz, and the bandwidth of the EHT TB PPDU is 160MHz.

Example 5: and when the bit value of the uplink bandwidth field in the trigger frame is 3 and the bit value of the uplink bandwidth extension field is 0, the trigger frame is used for indicating the HE TB PPDU and the EHT TB PPDU. The bandwidth of the HE TB PPDU is 160MHz, and the bandwidth of the EHT TB PPDU is 80MHz.

Example 6: and when the bit value of the uplink bandwidth field in the trigger frame is 3 and the bit value of the uplink bandwidth extension field is 1, the trigger frame is used for indicating that only HE TB PPDU exists, and the bandwidth of the HE TB PPDU is 160MHz. Or, the trigger frame is used to indicate that only the EHT TB PPDU has a bandwidth of 160MHz. Or the trigger frame is used for indicating the HE TB PPDU and the EHT TB PPDU, wherein the bandwidth of the HE TB PPDU is 160MHz, and the bandwidth of the EHT TB PPDU is 160MHz.

Example 7: and when the bit value of the uplink bandwidth field in the trigger frame is 3 and the bit value of the uplink bandwidth extension field is 2, the trigger frame is used for indicating that only the EHT TB PPDU exists, and the bandwidth of the EHT TB PPDU is 320MHz-1.

Example 8: and when the bit value of the uplink bandwidth field in the trigger frame is 3 and the bit value of the uplink bandwidth extension field is 3, the trigger frame is used for indicating that only the EHT TB PPDU exists, and the bandwidth of the EHT TB PPDU is 320MHz-2.

It should be noted that the above examples 1 to 8 are only examples and are not limited, and when the bit value of the uplink bandwidth field and the bit value of the uplink bandwidth extension field in the trigger frame are corresponding values, the combinations and bandwidths of the specifically indicated TB PPDUs may be interchanged. For example, when the bit value of the uplink bandwidth field in the trigger frame is 3 and the bit value of the uplink bandwidth extension field is 3, the trigger frame may be used to indicate that only EHT TB PPDUs have a bandwidth of 320MHz-1.

In yet another possible implementation manner, part or all of bits of at least one of an uplink bandwidth field and an uplink bandwidth extension field in the trigger frame are used to indicate the aggregated bandwidth information based on the TB a-PPDU. For example, the aggregate bandwidth of the HE TB PPDU requires only 2 bits to indicate. For example, a value of 2bit (decimal value) of 0 means 160MHz, a value of 2bit of 1 means 320MHz-1,2bit of 2 means 320MHz-2. Alternatively, if 320Mhz-1 and 320MHz-2 are not distinguished, only 1bit of the PPDU bandwidth is required to indicate.

For example, the aggregated trigger frame as shown in fig. 8a includes trigger frame 1 and trigger frame 2. The upstream bandwidth field and the upstream bandwidth extension field of trigger frame 1 indicate that the aggregate bandwidth is 160MHz. The STA1 receives the trigger frame 1 in the aggregation trigger frame on the parked 80MHz channel, and determines that the aggregation bandwidth is 160MHz according to the value of the uplink bandwidth field and the value of the uplink bandwidth extension field in the trigger frame 1. Further, the STA1 determines, according to the resource unit field in the trigger frame 1, that the bandwidth in which the STA1 transmits the EHT TB PPDU is 80MHz bandwidth of the specified channel position in the 160MHz aggregation bandwidth. Similarly, the STA2 receives the trigger frame 2 in the aggregation trigger frame over the docked 80MHz bandwidth, and determines that the aggregation bandwidth is 160MHz according to the value of the uplink bandwidth field and the value of the uplink bandwidth extension field in the trigger frame 2. Further, the STA2 determines, according to the RU indicated by the trigger frame 2, that the bandwidth in which the STA2 transmits the EHT TB PPDU is 80MHz bandwidth of the specified channel position in the 160MHz aggregation bandwidth.

Further, the common information field and the special user information field in the trigger frame are also used to indicate other information (such as physical layer version identification, etc.) in the aggregate bandwidth information besides the aggregate bandwidth. For example, for the case where the trigger frame indicates aggregation bandwidth information based on TB a-PPDU, b54 of the common information field of each trigger frame is used to indicate whether the TB PPDU is a HE TB PPDU. If b54 indicates 1, the TB PPDU is HE TB PPDU; if b54 indicates 0, the TB PPDU is an EHT PPDU. For another example, b54 indicates that what is transmitted within the primary 160MHz may be any one type of HE TB PPDU, EHT + TB PPDU. B55 of the common information field is used to indicate whether a special user field exists. Optionally, other reserved bits of the common information field are also used to indicate the type of each TB PPDU, or indicate which type of PPDU each 80MHz bandwidth transmitted is. For example, HE TB PPDU or EHT TB PPDU. The EHT TB PPDU and the EHT + TB PPDU may be regarded as PPDUs of the same type, and may be further distinguished by a physical layer version identification. For example, the EHT TB PPDU indicating transmission is an EHT TB PPDU, an EHT + + TB PPDU, or the like (here, it is only an example of a standard version, and the specific reference number and the representation manner are not limited in this embodiment). And in the corresponding EHT TB PPDU and EHT + TB PPDU, the target STA indicates the bandwidth in the U-SIG of the transmitted EHT TB PPDU or EHT + TB PPDU according to the bandwidth indicated by the trigger frame.

It can be seen that, when the trigger frame is used to indicate the aggregation bandwidth information based on the TB a-PPDU, a device that does not implement the EHT basic characteristic may know the aggregation bandwidth of the TB a-PPDU. The device which does not realize the basic characteristics of the EHT can carry out optimization of the spatial multiplexing operation aiming at the TB A-PPDU. The method is beneficial to spatial multiplexing transmission of equipment which does not realize the basic characteristics of the EHT, or prevents interference on current transmission.

In another implementation manner, part or all of bits of at least one field of an uplink bandwidth field and an uplink bandwidth extension field in the trigger frame are used to indicate bandwidth combination information of each PPDU in the TB a-PPDU. For example, the upstream bandwidth field and the upstream bandwidth extension field (4 bits total) of the aggregation trigger frame can indicate 16 bandwidth combinations at most. When indicating five bandwidth combinations as shown in table 7, only 3 bits in the upstream bandwidth field and the upstream bandwidth extension field need to be utilized. Wherein the bit value converted to a decimal value may serve as an indication of the bandwidth combination. For example, when the value of the uplink bandwidth field of the aggregation trigger frame is 0 and the value of the uplink bandwidth extension field is also 0, the identifier of the bandwidth combination indicated by the aggregation trigger frame is 0, that is, the indicated bandwidth combination is 80MHz-80MHz.

Illustratively, with this approach, the present embodiment can achieve several bandwidth combinations as shown in Table 7. The bandwidth combinations shown in table 7 are divided into a plurality of bandwidth combinations with a granularity of 80MHz, and other bandwidths (e.g. bandwidths smaller than 40 MHz) may also be used as the granularity, which is not limited in this embodiment. When the trigger frame is used to indicate bandwidth combination information of each PPDU in the TB a-PPDU, the trigger frame may not carry a bandwidth of a single PPDU, or may not carry an aggregation bandwidth, or may not carry a bandwidth and an aggregation bandwidth of a single PPDU. The STA can determine the bandwidth of the STA for transmitting the TB PPDU by the PPDU bandwidth combination information and the position of the parked channel within the entire aggregation bandwidth. For example, the aggregate trigger frame indicates a bandwidth combination of 80MHz-160MHz. And if the STA1 is positioned on the second 80MHz with the frequency from low to high, the STA1 determines that the PPDU bandwidth is 80MHz according to the bandwidth combination indicated by the parked channel and the trigger frame. And if the STA1 is positioned on the third or fourth 80MHz from low to high frequency, determining that the PPDU bandwidth is 80MHz or 160MHz.

Optionally, the indication information may further include aggregated bandwidth information, and obtain a specific bandwidth indication by combining the bandwidth combination information and the aggregated bandwidth information. For example, when the aggregate bandwidth is 160MHz, and the identification of the bandwidth combination indicated by the trigger frame is 4, a specific bandwidth combination of 80M to 80M can be obtained. In this case, the trigger frame may indicate only the aggregate bandwidth as 160MHz without further indication of the bandwidth combination, and may also determine that the specific bandwidth combination is 80M-80M. When the aggregation bandwidth is 320MHz, the bandwidth combination indicated by the trigger frame is marked as any one of 0-3.

Table 7: bandwidth combination list of TB A-PPDU

It can be seen that when the trigger frame is used to indicate the bandwidth combination information of each PPDU in the TB a-PPDU, the most flexible combination can be supported by this indication manner. For example, 5 flexible bandwidth combinations are included in table 7. The bandwidth combination also shows the aggregate bandwidth of the TB a-PPDU, as well as the bandwidth of the individual TB PPDU, which contains the largest amount of information.

In addition, for the implementation mode that the bandwidth information is indicated by at least one of an uplink efficient reserved field of the common information field, a reserved field of the common information field, an uplink general signaling reserved field of the special user information field, and a reserved field of the special user information field, since the bandwidth information indication in the trigger frame may indicate at least one of the following information: bandwidth information of the TB PPDUs, aggregated bandwidth information of the TB A-PPDUs, or bandwidth combination of each PPDU in the TB A-PPDUs. The bandwidth indication by using the above method may specifically include the following implementation manners:

in one possible implementation manner, part or all of reserved bits in at least one of the common information field and the special user information field in the trigger frame are used for indicating the bandwidth of each TB PPDU. For example, the aggregation trigger frame includes a plurality of trigger frames, each having a respective common information field and a particular user field, respectively indicating the PPDU bandwidth of the corresponding station. Illustratively, b56 and b57 in the common information field b56-b62 of each trigger frame in the aggregated trigger frame are used to indicate bandwidth information of the TB PPDU. For example, a value of b56 and b57 is 0 indicating 80MHz, a value of 1 indicating 160MHz, and a value of 2 indicating 320MHz. And the STA receives the corresponding trigger frame, reads the values of b56 and b57 in the common information field of the corresponding trigger frame, and thus acquires the bandwidth for transmitting the TB PPDU indicated by the AP to the STA.

In yet another possible implementation manner, some or all bits of reserved bits in at least one field of the common information field and the special user information field in the trigger frame are used for indicating the aggregation bandwidth information based on the TB a-PPDU. For example, there are 3 reserved bits (i.e., b37-b 39) in the special user information field of the aggregation trigger frame, and the default value is 0. Optionally, the values of two bits, b37 and b38, may be used to indicate the aggregate bandwidth. Illustratively, a value of 0 for b37 and b38 indicates that the aggregation bandwidth is 160MHz, and a value of 1 indicates that the aggregation bandwidth is 320MHz. For another example, a value of 00 (default value) for b37 and b38 indicates a non-a-PPDU, a value of 01 for b37 and b38 indicates an aggregation bandwidth of 160mhz, a value of 10 for b37 and b38 indicates an aggregation bandwidth of 320mhz, and a value of 11 for b37 and b38 is reserved. It should be noted that the meanings corresponding to the above values are only examples, and the meanings corresponding to different values may be interchanged, so that the present application is not limited.

In another implementation manner, part or all of reserved bits in at least one field of the common information field and the special user information field in the trigger frame are used to indicate bandwidth combination information of each PPDU in the TB a-PPDU. For example, there are three reserved bits (i.e., b37-b 39) in the special user information field of the aggregation trigger frame, which can indicate 8 bandwidth combinations at most. When the value of b37 is 0, the value of b38 is 1, and the value of b39 is 0 (i.e. the decimal value of the three reserved bits is 2), the bandwidth combination indicated by b37-b39 is 160MHz-80 MHz. Table 7 may be referred to for bandwidth combination information of each PPDU in the TB a-PPDU, which is not described herein again.

Further, the bandwidth information may also be jointly indicated by combining at least one of the uplink bandwidth field and the uplink bandwidth extension field, and at least one of the common information field and the special user information field. For example, part or all of bits of at least one of an uplink bandwidth field and an uplink bandwidth extension field of the trigger frame indicate one kind of bandwidth information, and part or all of bits of reserved bits of at least one of a common information field and a special user information field indicate another kind of bandwidth information.

Specifically, in an implementation manner, part or all of bits of at least one of an uplink bandwidth field and an uplink bandwidth extension field of the trigger frame are used for indicating a bandwidth of the TB PPDU, and part or all of reserved bits of at least one of a common information field and a special user information field are used for indicating an aggregated bandwidth of the a-PPDU. For example, some or all of the reserved bits of the uplink HE-SIG-A2 field in the common information field of the trigger frame are used to indicate the aggregated bandwidth. Wherein, the value of the reserved bit is 0 to indicate that the aggregation bandwidth is 160MHz, and the value of 1 to indicate that the aggregation bandwidth is 320MHz. In addition, the default state in the reserved field of the trigger frame is used to indicate a single PPDU, i.e., a non-a-PPDU case. For example, the default value (reserved value) of the reserved bits of the uplink HE-SIG-A2 in the common information field of the trigger frame is 1. The default value of two reserved bits 11 indicates that the trigger frame indicates a non-A-PPDU, 00 indicates that the trigger frame indicates an aggregate bandwidth of 160MHz,01 indicates that the trigger frame indicates an aggregate bandwidth of 320MHz, and 10 is reserved. Optionally, the specific bandwidth information indicated by the field in this implementation may exchange locations. That is, part or all of bits of at least one of an uplink bandwidth field and an uplink bandwidth extension field of the trigger frame may be used to indicate an aggregated bandwidth of the a-PPDU, and part or all of bits of reserved bits of at least one of a common information field and a special user information field may be used to indicate a bandwidth of the TB PPDU. Or, part or all of the bits of the uplink bandwidth field of the trigger frame are used for indicating the aggregation bandwidth of the A-PPDU, and part or all of the bits of the reserved bits of the trigger frame are used for indicating the bandwidth of the TB PPDU. For specific implementation and examples, reference may be made to the corresponding descriptions in the foregoing embodiments, which are not described herein again.

In yet another implementation manner, part or all of bits of at least one of an uplink bandwidth field and an uplink bandwidth extension field of the trigger frame are used to indicate bandwidth combination information of each PPDU in the TB a-PPDU, and part or all of bits of reserved bits of at least one of a common information field and a special user information field are used to indicate a bandwidth of the TB PPDU. Optionally, the specific bandwidth information indicated by the field in this implementation may also exchange locations. That is, part or all of bits of at least one of an uplink bandwidth field and an uplink bandwidth extension field of the trigger frame may be used to indicate a bandwidth of the TB PPDU, and part or all of bits of reserved bits of at least one of a common information field and a special user information field are used to indicate bandwidth combination information of each PPDU in the TB a-PPDU. For specific implementation and examples, reference may be made to the corresponding descriptions in the foregoing embodiments, which are not described herein again.

In another implementation manner, part or all of bits of at least one of an uplink bandwidth field and an uplink bandwidth extension field of the trigger frame are used to indicate an aggregated bandwidth of the a-PPDU, and part or all of reserved bits of at least one of a common information field and a special user information field are used to indicate bandwidth combination information of each PPDU in the TB a-PPDU. Optionally, the specific bandwidth information indicated by the field in this implementation may also exchange locations. That is, part or all of bits of at least one of an uplink bandwidth field and an uplink bandwidth extension field of the trigger frame may be used to indicate bandwidth combination information of respective PPDUs in TB a-PPDU, and part or all of reserved bits of at least one of a common information field and a special user information field are used to indicate an aggregated bandwidth of the a-PPDU. For specific implementation and examples, reference may be made to the corresponding descriptions in the foregoing embodiments, which are not described herein again.

In another example, the number of the indication information is multiple, and the indication information is carried in one trigger frame or multiple trigger frames. The multiple trigger frames are obtained by copying the same trigger frame in different frequency domain ranges. The trigger frame indicating the bandwidth of the TB a-PPDU in this example is divided into two cases: only one trigger frame, or the same trigger frame, is duplicated in different frequency ranges within the TB a-PPDU bandwidth. For example, fig. 9 is a schematic diagram of duplicate transmissions of the same trigger frame in different 80MHz according to an embodiment of the present application. The multiple trigger frames in fig. 9 are obtained by copying the same trigger frame in 4 80MHz equally divided in the entire 320MHz, that is, the content of the trigger frames 1-4 is the same. Correspondingly, the bandwidth of the TB PPDU indicated by the trigger frames 1-4 is also the same, as shown in fig. 9. This example applies to the scenario where the trigger frame is replicated in the bandwidth of the TB a-PPDU. For example, this example applies to scenarios where the non-high throughput PPDU of the 802.11 standard requires replication across the entire bandwidth. Wherein, the non-high throughput rate PPDU can provide better protection of transmission opportunity and reduce interference. The present example also includes a scenario where only one trigger frame is transmitted within the entire bandwidth, and the one trigger frame can also indicate an aggregated TB PPDU.

In a first implementation manner, part or all of bits of at least one field of an uplink bandwidth field and an uplink bandwidth extension field in a trigger frame are used to indicate a bandwidth of each TB PPDU. Optionally, some or all of the reserved bits in at least one of the common information field and the special user information field of the trigger frame are used to indicate the bandwidth of each TB PPDU.

In a second implementation manner, part or all of bits of at least one of an uplink bandwidth field and an uplink bandwidth extension field in a trigger frame are used to indicate aggregated bandwidth information based on TB a-PPDU. Optionally, some or all bits of reserved bits in at least one of the common information field and the special user information field of the trigger frame are used for indicating the aggregated bandwidth information based on the TB a-PPDU.

In a third implementation manner, part or all of bits of at least one field of an uplink bandwidth field and an uplink bandwidth extension field in a trigger frame are used for indicating a bandwidth combination based on TB a-PPDU. Optionally, some or all bits of reserved bits in at least one of the common information field and the special user information field of the trigger frame are used for indicating the bandwidth combination based on the TB a-PPDU. For the specific implementation steps of the three implementations, reference may be made to the description related to the foregoing embodiments, and details are not repeated herein. It should be noted that the bandwidth of all EHTTB PPDUs or EHT + TB PPDUs in the above three implementations is the same.

In a fourth implementation manner, part or all of bits of at least one of an uplink bandwidth field and an uplink bandwidth extension field of the trigger frame are used for indicating aggregated bandwidth information based on TB a-PPDU, and part or all of reserved bits in at least one of a common information field and a special user information field of the trigger frame are used for indicating bandwidth information of each TB PPDU. For example, if the entire bandwidth is 320MHz with 80MHz as granularity, the TB PPDU in the TB a-PPDU may have two bandwidths of 80MHz or 160MHz. When the bandwidth of each TB PPDU is 80MHz (i.e., the bandwidth divided into four TB PPDUs), a part of bits of reserved bits in at least one field of the common information field and the special user information field of the trigger frame (e.g., 4 bits of the reserved bits b25-b36 of the uplink U-SIG of the special user information field shown in fig. 6) are used to indicate the bandwidth of each TB PPDU. Alternatively, 3 bits of the reserved bits of the trigger frame are used to indicate the bandwidth of each TB PPDU (the bandwidth of the last TB PPDU is equal to the aggregate bandwidth minus the previous few indicated bandwidths).

Optionally, when part or all of reserved bits in at least one field of the common information field and the special user information field of the trigger frame are used to indicate the bandwidth of each TB PPDU, the STA sums the bandwidths of the TB PPDUs to determine whether the summed value is equal to the aggregated bandwidth of the TB a-PPDU, so as to determine the number of the TB PPDUs. For example, if the aggregate bandwidth indicated by the trigger frame is 320mhz, the bandwidth of TB PPDU1 is 160mhz, and the bandwidth of TB PPDU2 is 160MHz, the STA determines that there are 2 TB PPDUs in the entire bandwidth. For another example, if the aggregation bandwidth indicated by the trigger frame is 320mhz, the bandwidth of tb PPDU1 is 160mhz, the bandwidth of tb PPDU2 is 80mhz, and the bandwidth of tb PPDU3 is 80MHz, the STA determines that there are 3 PPDUs in the entire bandwidth. The bandwidth of each TB PPDU indicates the required number of bits and the relative order of each entry, which is not limited in this embodiment.

Optionally, some or all bits of reserved bits in at least one of the common information field and the special user information field of the trigger frame are used for indicating the number of TB PPDUs. For example, 2 bits of the reserved bits of the trigger frame are used to indicate the number of TB PPDUs. The default value (value is 0) represents 1, and the other values (value is 1,2 and 3) represent 2-4. The foregoing examples are by way of illustration only and are not limiting.

In a fifth implementation manner, part or all of bits of at least one of an uplink bandwidth field and an uplink bandwidth extension field of the trigger frame are used to indicate an aggregated bandwidth of the a-PPDU, and part or all of bits of reserved bits in at least one of a common information field and a special user information field of the trigger frame are used to indicate an identifier of a bandwidth combination of each PPDU in the TB a-PPDU. For example, both the AP and the STA acquire the bandwidth combination of TB a-PPDU as shown in table 7 in advance. The partial reserved bits of the special user information field of the trigger frame sent by the AP to the STA (e.g., 3 bits of the upstream U-SIG reserved bits b25-b36 of the special user information field shown in fig. 6) are used to indicate the identities 0-4 of the bandwidth combinations in table 7.

In a sixth implementation manner, the uplink bandwidth field (2 bit) and the uplink bandwidth extension field (1 bit is added to the uplink bandwidth extension field, and the extension is 3 bit) of the trigger frame are used to indicate bandwidth combination information of each PPDU in the TB a-PPDU. For example, table 8 is a list of another uplink bandwidth field and uplink bandwidth extension field provided in this embodiment. Compared to table 2, the uplink bandwidth extension field in table 8 is represented by 3 bits, thereby indicating more bandwidth combinations. The extra extended bits may be from some or all of the reserved bits in at least one of the common information field and the special user information field of the trigger frame.

Table 8: bandwidth combination list indicating A-PPDU by uplink bandwidth field and uplink bandwidth extension field

It can be seen that the upstream bandwidth field and the upstream bandwidth extension field shown in table 8 can indicate all possible combinations at the entire 320MHz bandwidth (the reservations in table 8 can also indicate multiple combined bandwidths in the case of other granularity divisions). Wherein table 8 may be used to indicate a case where no HE TB PPDU is included, only at least one of an EHT TB PPDU, an EHT + TB PPDU. For example, in the bandwidth column of the EHT TB PPDU in table 8, only one number (e.g., row 2) indicates that there is only one EHT TB PPDU or EHT + TB PPDU. A-B (e.g., line 23) represents two EHT TB PPDUs or a combination of EHT + TB PPDUs. A-B-C (e.g., line 25) represents three EHT TB PPDUs or a combination of EHT + TB PPDUs. A-B-C-D (e.g., line 24) represents four EHT TB PPDUs or a combination of EHT + TB PPDUs.

Optionally, some or all of the entries in table 8 above are merged into one row, so as to reserve more reserved bits. For example, when the bandwidths of all TB PPDUs are the same, the bandwidth combinations indicated by rows 18, 23, and 24 in Table 8 are effectively the same bandwidth combination 80-80-80-80. Then row 18, row 23 and row 24 in table 8 are merged into one row. As another example, when the bandwidths of all TB PPDUs are the same, the bandwidth combinations indicated in rows 27 and 31 in Table 8 are actually the same bandwidth combinations 160-160. Then row 18, row 23 and row 24 in table 8 are merged into one row. It can be seen that table 8 after merging can retain more reserved bits, indicating more possible bandwidth combination cases.

Optionally, based on table 2 in the previous embodiment, the ap selects one reserved entry in table 2 to indicate the a-PPDU extension. For example, table 9 is the upstream bandwidth field and the upstream bandwidth extension field redefined to one of the reserved entries in table 2. And when the value of the uplink bandwidth field is 2 and the value of the uplink bandwidth extension field is 2, the uplink bandwidth field and the uplink bandwidth extension field are used for indicating the extension of the TB A-PPDU. And then use other fields alone to indicate the combination of the individual PPDU bandwidths in the TB a-PPDU. For example, the bandwidth combination of TB a-PPDU as shown in table 7 is indicated with other fields. The other fields may be from some or all of the reserved bits in at least one of the common information field and the special user information field of the trigger frame.

Table 9: bandwidth combination list indicating A-PPDU by uplink bandwidth field and uplink bandwidth extension field

In yet another implementation, the user information list field of the trigger frame shown in fig. 6 may be modified, and the modified user information field includes a plurality of special user information fields. For example, fig. 10 is a schematic structural diagram of an improved trigger frame according to an embodiment of the present application. In the user information list field of the trigger frame, 3 special user information fields are additionally added, that is, the user information list field of the improved trigger frame includes 4 special user information fields, as shown in fig. 10. Wherein, one trigger frame can simultaneously instruct to schedule 4 TB PPDUs, and each special user information field corresponds to information indicating the scheduled TB PPDU. Wherein each special user information field is also used to indicate common information required in the U-SIG of the scheduled TB PPDU. It should be noted that, the inclusion of 4 special user information fields in the user information list field of the improved trigger frame is only an example, and is not limited to this, and any special user information field may be included in the user information list field.

Alternatively, if b55 in fig. 10 indicates that the special user field exists, the common field of the trigger frame is separately indicated (e.g., b56-b 57) to indicate the number of the special user information fields. If the reserved bit b55 in fig. 10 indicates the existence of the special user field, the trigger frame may not use a special bit to indicate the number of the special user information fields. For example, when the STA parses the trigger frame and determines that the reserved bit b55 indicates that the special user field exists, the STA may determine the number of the special user information fields by the number of the special association identifiers (AID 12).

Wherein, the special association identifiers of the plurality of special user fields (AID 12 represents the 12 lower bits in the AID) can be set to 2007. For example, the number of AIDs 12=2007 indicates the number of special user information fields. Alternatively, the special association identifications of the plurality of special user fields are set to different AID values. For example, AID12=2007, 2006, 2005, 2004, etc. (2007-the last special AID +1 indicates the number of special user information fields). Wherein the AID is not allocated to any STA but is regarded as an identifier of a special user field.

In summary, the AP generates the indication information according to the above-mentioned various implementation manners, and then sends the indication information to the STA. Correspondingly, the STA receives the indication information. And the STA determines the bandwidth information of the TB PPDU corresponding to the STA and sends the TB PPDU to the AP on the bandwidth of the TB PPDU corresponding to the STA. The specific sending flow may refer to the related description in the existing standard, and the embodiment is not limited. The method comprises the steps that the bandwidth of the TB PPDU sent by the STA, the aggregation bandwidth of the TB A-PPDU and the bandwidth combination of each PPDU in the TB A-PPDU are included in the EHTTB PPDU or the EHT + TB PPDU sent by the STA to the AP.

Further, in an example, the STA determines a bandwidth for transmitting the TB PPDU according to the indication information, and also determines an EHT-LTF sequence used for transmitting the TB PPDU according to the indication information. Where the EHT-LTF sequence is mainly used for channel estimation, the EHT-LTF sequence is typically indicated by a U-SIG field (e.g., a bandwidth field of the U-SIG field) of the EHT TB PPDU. The EHT-LTF sequence is carried in the EHT-LTF field of the EHT TB PPDU.

Because the OFDM symbol is formed by superimposing a plurality of independently modulated subcarrier signals, when the phases of the respective subcarriers are the same or close to each other, the superimposed signal is modulated by the same initial phase signal, so as to generate a larger instantaneous power peak, thereby bringing a higher peak-to-average power ratio (PAPR). Since the dynamic range of a general power amplifier is limited, a signal with a high PAPR easily enters a non-linear region of the power amplifier, resulting in non-linear distortion of the signal, causing significant spectrum spreading interference and in-band signal distortion, resulting in a severe degradation of the performance of the entire system. In order to solve the problem of high PAPR, the 802.11be standard designs different EHT-LTF sequences according to the difference of PPDU bandwidths. Different EHT-LTF sequences are used to optimize PAPR under different bandwidth conditions. In addition, the symbol removal guard interval of the EHT-LTF field has three sizes (3.2 microseconds, 6.4 microseconds, 12.8 microseconds) and is called 1xEHT-LTF, 2xEHT-LTF, and 4 xEHT-LTF, respectively. All EHT-LTF sequences are composed of 1, -1 and 0, and the specific sequence is not limited in this embodiment. For non-A-PPDU scenarios, the 802.11be standard defines several classes of EHT-LTF sequences as shown in Table 10. Wherein the EHT-LTF sequence shown in Table 10 is indicated by the bandwidth field (B3-B5) in the U-SIG field of the EHT TB PPDU.

Table 10: list of EHT-LTF sequences

As can be seen, according to table 10, when the STA confirms the bandwidth indicated by the AP to transmit the TB PPDU, the STA can determine the EHT-LTF sequence employed for transmitting the TB PPDU. For example, the STA receives indication information indicating that a bandwidth in which the STA transmits an EHT TB PPDU is 80MHz. Then the STA determines from table 10 that the alternative EHT-LTF sequence includes an EHT-LTF _{80MHz_1x} 、EHT-LTF _{80MHz_2x} 、EHT-LTF _{80MHz_4} . Wherein, under a certain bandwidth, 1xEHT-LTF, 2xEHT-LTF,Which EHT-LTF sequence is selected from the 4 × EHT-LTFs depends on the transmission mode, the channel environment, and the like, and the embodiment is not limited.

In a first implementation, the STA selects the EHT-LTF sequence according to the aggregation bandwidth of the TB a-PPDU. A benefit of selecting an EHT-LTF sequence in this implementation is the ability to optimize PAPR for the aggregated bandwidth. In addition, when the uplink bandwidth field and the uplink bandwidth extension field are used to indicate the aggregate bandwidth of the TB a-PPDU, a device implementing the basic characteristics of EHT can implement transparent transmission. That is to say, a device that implements the basic EHT characteristic may consider that the entire aggregation bandwidth is a PPDU or an HE + EHT TB PPDU, and may identify and process data.

In a second implementation, the STA selects an EHT-LTF sequence according to the bandwidth of each TB PPDU. A benefit of selecting an EHT-LTF sequence in this implementation is that unification of the EHT-LTF sequence can be achieved for devices that do not implement the basic characteristics of EHT. In addition, when the uplink bandwidth field and the uplink bandwidth extension field are used to indicate the bandwidth of a certain PPDU, a device implementing the basic characteristics of EHT can implement transparent transmission.

In a third implementation manner, the STA selects an EHT-LTF sequence according to a bandwidth combination of each TB PPDU in the TB a-PPDU. The benefit of selecting an EHT-LTF sequence in this implementation is that the PAPR of the EHT-LTF sequence can be further optimized. For example, different +1 or-1 phase coefficients are multiplied according to different bandwidth combinations, so that the PAPR is optimal in each combination case.

In a fourth implementation, the STA selects the EHT-LTF sequence according to the aggregation bandwidth of the TB a-PPDU and the type of PPDU transmitted within each 80MHz. When selecting an EHT-LTF sequence in this implementation, the AP needs to further indicate the type of PPDU transmitted in each 80MHz. For example, the STA reserves bits (e.g., 4 bits) according to a part of the common information field of the trigger frame, where a bit value of 0 indicates HE and a bit value of 1 indicates EHT or EHT +. It should be noted that if there is one and only one HE PPDU in the a-PPDU and it must be located on the primary 80MHz or primary 160MHz channel, the trigger frame need not indicate the type of PPDU. If there is at most one HE PPDU in the a-PPDU and it must be located on the primary 80MHz or primary 160MHz channel, the trigger frame only needs to indicate whether there is an HE PPDU on the primary 80MHz or primary 160MHz channel. The benefit of selecting the EHT-LTF sequence in this implementation is the ability to further consider the type of TB PPDU and optimize the PAPR of the EHT-LTF sequence.

In another example, after receiving the TB a-PPDU from the station, the AP selects an EHT-LTF sequence according to one or more of the bandwidth of the TB PPDU, the aggregate bandwidth of the TB a-PPDU, and the bandwidth combination of each PPDU in the TB a-PPDU. Wherein the EHT-LTF sequence selected by the AP is used for channel estimation. For example, in an ideal case, after the data receiving end receives the signal, the received signal may be divided by a known sequence (e.g., an EHT-LTF sequence) for each subcarrier to obtain a channel value.

In a first implementation, the AP selects the EHT-LTF sequence according to the aggregation bandwidth of the TB a-PPDU. In a second implementation manner, the AP selects an EHT-LTF sequence according to the bandwidth of each TBPPDU. In a third implementation, the AP selects an EHT-LTF sequence according to a bandwidth combination of each of the TB a-PPDUs. In a fourth implementation, the AP selects the EHT-LTF sequence according to the aggregation bandwidth of TB a-PPDU and the type of PPDU transmitted within each 80MHz. It should be noted that in the fourth implementation manner, the bandwidth of the PPDU is divided according to the granularity of 80MHz, and may also be divided according to other granularities, which is not limited in this embodiment. When selecting an EHT-LTF sequence in this implementation, the AP needs to further indicate the type of PPDU transmitted in each 80MHz. For the benefits and examples of the above four implementation manners, reference may be made to the relevant descriptions in the four implementation manners corresponding to the STA side, and details are not described here again.

Wherein, alternative EHT-LTF sequences can refer to a plurality of EHT-LTF sequences shown in Table 10, and the EHT-LTF sequences can be further designed and optimized according to the characteristics. PAPR is further optimized, for example, using a variety of EHT-LTF sequences as shown in table 10, with 80MHz as granularity, multiplied by a phase coefficient of +1 or-1. The HE TB PPDU may exist in the TB a-PPDU, but in order to ensure that the legacy HE device transmits the HE TB PPDU, this embodiment does not involve modifying the HE TB PPDU.

The embodiment of the application provides a bandwidth indication method, and an access point indicates multiple bandwidth information or indicates aggregated bandwidth information or indicates a combination of aggregated bandwidths to multiple stations when multiple TB PPDUs are aggregated for transmission, so that the access point is facilitated to schedule multiple TB PPDUs sent simultaneously, and the large bandwidth capability of the access point is better utilized.

The bandwidth method of the embodiment of the present application is described in detail above with reference to fig. 1 to 10. The bandwidth indicating apparatus and the related devices of the embodiment of the present application are described in detail below with reference to fig. 11 to fig. 14. It should be understood that the bandwidth indicating apparatus and associated devices shown in fig. 11-14 are capable of implementing one or more steps of the method flows shown in fig. 1-10. To avoid repetition, detailed description is omitted.

Fig. 11 is a schematic view of a bandwidth indicating device according to an embodiment of the present application. The bandwidth indicating apparatus shown in fig. 11 is used to implement the method performed by the station in the embodiments shown in fig. 1 to fig. 10. The bandwidth indicating apparatus includes a transceiving unit 1101 and a processing unit 1102. The transceiver 1101 is configured to receive indication information from an access point. The indication information is used for indicating the bandwidth information of three or more TB PPDUs. The three or more TB PPDUs include one or more of HE TB PPDU, EHT TB PPDU, evolved EHT TB PPDU. The processing unit 1102 is configured to determine bandwidth information of a TB PPDU corresponding to a station.

In one implementation, the number of the indication information is plural. The indication information is carried in the aggregation trigger frame. The aggregation trigger frame comprises a plurality of trigger frames, and one trigger frame carries one indication message.

In one implementation, the number of the indication information is plural. The indication information is carried in one trigger frame or a plurality of trigger frames. The multiple trigger frames are obtained by copying the same trigger frame in different frequency domain ranges.

In one implementation, the indication information is used to indicate one or more of bandwidth information of a TB PPDU, aggregated bandwidth information of a trigger-based aggregated physical layer protocol data unit, TB a-PPDU, or bandwidth combination information of each PPDU in the TB a-PPDU.

In one implementation, the indication information is carried in at least one of the following fields of the trigger frame: a first field and a second field. The first field is an uplink bandwidth field of the trigger frame, or the uplink bandwidth field and an uplink bandwidth extension field. The second field is a reserved field of the trigger frame. The reserved field of the trigger frame is any one of the following fields: the system comprises an uplink efficient reserved field of a public information field, a reserved field of the public information field, an uplink general signaling reserved field of a special user information field and a reserved field of the special user information field.

In one implementation, part or all of bits in at least one field of the uplink bandwidth field and the uplink bandwidth extension field of the trigger frame are used to indicate at least one of the three types of bandwidth information described in the above implementation.

In one implementation, some or all of the reserved bits in at least one of the common information field and the special user information field of the trigger frame are used to indicate at least one of the three types of bandwidth information described in the above implementation.

In one implementation, one trigger frame includes a plurality of special user fields, each for indicating a bandwidth of one TB PPDU.

In one implementation, the processing unit 1102 is further configured to generate a very high throughput long training EHT-LTF sequence based on the indication information. The transceiver unit 1101 is further configured to transmit the EHT-LTF sequence to the access point.

In one implementation, the processing unit 1102 is further configured to generate an EHT-LTF sequence based on the indication information, including:

In one implementation, the relevant functions implemented by the various units in fig. 11 may be implemented by a transceiver and a processor. Fig. 12 is a schematic diagram of a station provided in an embodiment of the present application. The station may be a device (e.g., a chip) capable of executing the bandwidth indication method provided by the embodiment of the present application. Wherein a station may include a transceiver 1201, at least one processor 1202, and a memory 1203. The transceiver 1201, the processor 1202, and the memory 1203 may be connected to each other through one or more communication buses, or may be connected in other manners.

The transceiver 1201 may be used to transmit data or receive data, among other things. It is to be understood that the transceiver 1201 is a generic term and may include both receivers and transmitters. For example, the receiver is configured to receive indication information from the access point. As another example, the transmitter is configured to transmit a TB PPDU to the access point.

The processor 1202 may be configured to process data of a station, among other things. The processor 1202 may include one or more processors, for example, the processor 1202 may be one or more Central Processing Units (CPUs), network Processors (NPs), hardware chips, or any combination thereof. In the case where the processor 1202 is a single CPU, the CPU may be a single-core CPU or a multi-core CPU.

The memory 1203 is used for storing program codes and the like. The memory 1203 may include volatile memory (volatile memory), such as Random Access Memory (RAM); the memory 1203 may also include a non-volatile memory (non-volatile memory), such as a read-only memory (ROM), a flash memory (flash memory), a Hard Disk Drive (HDD) or a solid-state drive (SSD); the memory 1203 may also include a combination of the above types of memories.

The processor 1202 and the memory 1203 may be coupled through an interface or integrated together, which is not limited in this embodiment.

The transceiver 1201 and the processor 1202 may be configured to execute the bandwidth indication method provided in the embodiment of the present application, and the specific implementation manner is as follows:

the transceiver 1201 is configured to receive indication information from an access point. The indication information is used for indicating the bandwidth information of three or more trigger-based physical layer protocol data units (TB PPDUs). Wherein, the three or more TB PPDUs comprise one or more of HE TB PPDU, EHT TB PPDU and evolved EHT TB PPDU. The processor 1202 is configured to determine bandwidth information of a TB PPDU corresponding to a station. The transceiver 1201 is also configured to transmit a TB PPDU to the access point on a bandwidth of the TB PPDU corresponding to the station.

In one implementation, the indication information is carried in at least one of the following fields of the trigger frame: a first field and a second field. The first field is an uplink bandwidth field of the trigger frame, or the uplink bandwidth field and the uplink bandwidth extension field. The second field is a reserved field of the trigger frame. The reserved field of the trigger frame is any one of the following fields: the system comprises an uplink efficient reserved field of a public information field, a reserved field of the public information field, an uplink general signaling reserved field of a special user information field and a reserved field of the special user information field.

In one implementation, some or all bits in at least one field of the uplink bandwidth field and the uplink bandwidth extension field of the trigger frame are used to indicate at least one of the three types of bandwidth information described in the above implementation.

In one implementation, the processor 1202 is further configured to generate a very high throughput long training EHT-LTF sequence based on the indication information. The transceiver 1201 is also used to transmit an EHT-LTF sequence to the access point.

In one implementation, the processor 1202 is further configured to generate a very high throughput long training EHT-LTF sequence based on the indication information, including:

It can be understood that, all the foregoing method embodiments may be cited in the bandwidth indicating apparatus and the station as shown in fig. 11 and fig. 12, and for the beneficial effects that can be achieved, reference is made to the corresponding description in the foregoing method embodiments, and details are not repeated here.

Fig. 13 is a schematic diagram of another bandwidth indicating apparatus according to an embodiment of the present application. The bandwidth indicating apparatus shown in fig. 13 is used to implement the method performed by the access point in the above embodiment. The bandwidth indicating apparatus includes a processing unit 1301 and a transceiving unit 1302. The processing unit 1301 is configured to generate indication information. The indication information is used for indicating the bandwidth information of three or more trigger-based physical layer protocol data units (TB PPDUs). The three or more TB PPDUs include one or more of HE TB PPDU, EHT TB PPDU, evolved EHT TB PPDU. The transceiving unit 1302 is configured to send indication information to a station.

In one implementation, the indication information is carried in at least one of the following fields of the trigger frame: a first field and a second field. The first field is an uplink bandwidth field of the trigger frame, or the uplink bandwidth field and an uplink bandwidth extension field. The second field is a reserved field of the trigger frame. The reserved field of the trigger frame is any one of the following fields: the system comprises an uplink high-efficiency reserved field of a public information field, a reserved field of the public information field, an uplink general signaling reserved field of a special user information field and a reserved field of the special user information field.

In one implementation, the transceiver unit 1302 is further configured to receive an EHT-LTF sequence from a station. The processing unit 1301 is further configured to perform channel estimation according to the EHT-LTF sequence, which is determined by the indication information.

In one implementation, the relevant functions implemented by the various units in fig. 13 may be implemented by a transceiver and a processor. Fig. 14 is a schematic diagram of an access point according to an embodiment of the present application. The access point may be a device (e.g., a chip) capable of performing the bandwidth indication method provided by the embodiments of the present application. Wherein the access point may comprise a transceiver 1401, at least one processor 1402, and a memory 1403. The transceiver 1401, the processor 1402 and the memory 1403 may be connected to each other via one or more communication buses, or may be connected in other ways.

The transceiver 1401 may be used to transmit data, or receive data, among other things. It is to be appreciated that the transceiver 1401 is a generic term and can include both a receiver and a transmitter. For example, the receiver is used to receive a TB PPDU from a station. As another example, the transmitter is used to transmit the indication information to the station.

Processor 1402 can be configured to process data for an access point, among other things. The processor 1402 may include one or more processors, for example, the processor 1402 may be one or more central processing units CPU, a network processor NP, a hardware chip, or any combination thereof. In the case where the processor 1402 is one CPU, the CPU may be a single-core CPU or a multi-core CPU.

The memory 1403 is used for storing a program code and the like, among others. Memory 1403 may include volatile memory, such as random access memory RAM; the memory 1403 may also include a non-volatile memory, such as a read only memory ROM, flash memory, hard disk HDD, or solid state disk SSD; memory 1403 can also include a combination of the above types of memory.

The processor 1402 and the memory 1403 may be coupled through an interface, or may be integrated together, which is not limited in this embodiment.

The transceiver 1401 and the processor 1402 may be configured to execute the bandwidth indication method provided in this embodiment, and the specific implementation manner is as follows:

the processor 1402 is configured to generate indication information. The indication information is used for indicating the bandwidth information of three or more trigger-based physical layer protocol data units (TB PPDUs). The three or more TB PPDUs include one or more of HE TB PPDU, EHT TB PPDU, evolved EHT TB PPDU. The transceiver 1401 is used to transmit indication information to a station.

In one implementation, transceiver 1401 is also used to receive EHT-LTF sequences from stations. Processor 1402 is also configured to perform channel estimation based on the EHT-LTF sequence, which is determined by the indication information.

It can be understood that, all the foregoing method embodiments may be cited in the bandwidth indicating apparatus and the access point as shown in fig. 13 and fig. 14, and for the beneficial effects that can be achieved, reference is made to the corresponding description in the foregoing method embodiments, and details are not repeated here.

An embodiment of the present application provides a communication system, which includes the station and the access point described in the foregoing embodiments.

Embodiments of the present application provide a computer-readable storage medium, which stores a program or instructions, and when the program or instructions are run on a computer, the program or instructions cause the computer to execute a bandwidth indication method in an embodiment of the present application.

The embodiment of the present application provides a chip or a chip system, where the chip or the chip system includes at least one processor and an interface, the interface and the at least one processor are interconnected through a line, and the at least one processor is configured to run a computer program or an instruction to perform the bandwidth indication method in the embodiment of the present application.

The system-on-chip in the above aspect may be a system-on-chip (SOC), or a baseband chip, and the like, where the baseband chip may include a processor, a channel encoder, a digital signal processor, a modem, an interface module, and the like.

In one implementation, the chip or chip system described above in this application further includes at least one memory having instructions stored therein. The memory may be a storage unit inside the chip, such as a register, a cache, etc., or may be a storage unit of the chip (e.g., a read-only memory, a random access memory, etc.).

In the above embodiments, all or part of the implementation may be realized by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When loaded and executed on a computer, cause the processes or functions described in accordance with the embodiments of the application to occur, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored on a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, from one website, computer, server, or data center to another website, computer, server, or data center via wire (e.g., coaxial cable, fiber optic, digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device, such as a server, a data center, etc., that incorporates one or more of the available media. The usable medium may be a magnetic medium (e.g., a floppy disk, a hard disk, a magnetic tape), an optical medium (e.g., a Digital Video Disk (DVD)), or a semiconductor medium (e.g., a Solid State Disk (SSD)), among others.

Those of ordinary skill in the art will appreciate that the various illustrative components and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the components and steps of the various examples have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A bandwidth indication method, comprising:

a site receives indication information from an access point, wherein the indication information is used for indicating bandwidth information of three or more physical layer protocol data units (TB PPDUs) based on triggering; the three or more TB PPDUs comprise one or more of a high-efficiency trigger-based physical layer protocol data unit, a very high throughput trigger-based physical layer protocol data unit and an evolved very high throughput trigger-based physical layer protocol data unit;

and the site determines the bandwidth information of the TB PPDU corresponding to the site and sends the TB PPDU to the access point on the bandwidth of the TB PPDU corresponding to the site.

2. A bandwidth indication method, comprising:

the access point generates indication information, wherein the indication information is used for indicating the bandwidth information of three or more physical layer protocol data units (TB PPDUs) based on triggering; the three or more TB PPDUs comprise one or more of a high-efficiency trigger-based physical layer protocol data unit, a very high throughput trigger-based physical layer protocol data unit and an evolved very high throughput trigger-based physical layer protocol data unit;

and the access point sends the indication information to the station.

3. The method according to claim 1 or 2, wherein the number of the indication information is plural, the indication information is carried in an aggregation trigger frame, the aggregation trigger frame comprises a plurality of trigger frames, and one trigger frame carries one indication information.

4. The method according to claim 1 or 2, wherein the number of the indication information is multiple, the indication information is carried in one trigger frame or multiple trigger frames, and the multiple trigger frames are obtained by copying the same trigger frame in different frequency domain ranges.

5. The method as claimed in any one of claims 1 to 4, wherein the indication information is used to indicate bandwidth information of three or more trigger-based physical layer protocol data units (TB PPDUs), and comprises:

the indication information is used for indicating at least one of the following information: bandwidth information of the TB PPDU, aggregation bandwidth information of a triggered aggregation physical layer protocol data unit (TB A-PPDU) or bandwidth combination information of each PPDU in the TB A-PPDU.

6. The method of claim 5, wherein the indication information is carried in at least one of the following fields of a trigger frame: the device comprises a first field and a second field, wherein the first field is an uplink bandwidth field and an uplink bandwidth extension field of a trigger frame, and the second field is a reserved field of the trigger frame.

7. The method of claim 4, wherein a trigger frame comprises a plurality of special user fields, a special user field indicating a bandwidth of a TB PPDU.

8. The method of claim 1, further comprising:

the station generates an EHT-LTF sequence based on the indication information and transmits the EHT-LTF sequence to the access point.

9. The method according to claim 5 or 8, wherein the station generates an EHT-LTF sequence based on the indication information, comprising:

and the station generates an EHT-LTF sequence based on one or more of bandwidth information of the TB PPDU, aggregated bandwidth information of the TB A-PPDU or bandwidth combination information of each PPDU in the TB A-PPDU.

10. The method of claim 2, further comprising:

the access point receives an EHT-LTF sequence from the station and performs channel estimation according to the EHT-LTF sequence, wherein the EHT-LTF sequence is determined by the indication information.

11. A bandwidth indicating device, comprising:

the system comprises a receiving and sending unit, a sending and receiving unit and a sending and receiving unit, wherein the receiving and sending unit is used for receiving indication information from an access point, and the indication information is used for indicating the bandwidth information of three or more physical layer protocol data units (TB PPDUs) based on triggering; the three or more TB PPDUs comprise one or more of a high-efficiency trigger-based physical layer protocol data unit, a very high throughput trigger-based physical layer protocol data unit and an evolved very high throughput trigger-based physical layer protocol data unit;

the processing unit is used for determining the bandwidth information of the TB PPDU corresponding to the site;

the transceiver unit is further configured to send a TB PPDU to the access point on a bandwidth of the TB PPDU corresponding to the station.

12. A bandwidth indicating device, comprising:

the processing unit is used for generating indication information, and the indication information is used for indicating the bandwidth information of three or more physical layer protocol data units (TB PPDUs) based on triggering; the three or more TB PPDUs comprise one or more of a high-efficiency trigger-based physical layer protocol data unit, a very high throughput trigger-based physical layer protocol data unit and an evolved very high throughput trigger-based physical layer protocol data unit;

and the transceiver unit is used for sending the indication information to the site.

13. The apparatus according to claim 11 or 12, wherein the number of the indication information is plural, the indication information is carried in an aggregation trigger frame, the aggregation trigger frame includes a plurality of trigger frames, and one trigger frame carries one indication information.

14. The apparatus according to claim 11 or 12, wherein the number of the indication information is plural, the indication information is carried in one trigger frame or plural trigger frames, and the plural trigger frames are obtained by copying the same trigger frame in different frequency domain ranges.

15. The apparatus as claimed in any one of claims 11 to 14, wherein the indication information is configured to indicate bandwidth information of three or more trigger-based physical layer protocol data units, TB PPDUs, and includes:

16. The apparatus of claim 15, wherein the indication information is carried in at least one of the following fields of a trigger frame: the field setting device comprises a first field and a second field, wherein the first field is an uplink bandwidth field and an uplink bandwidth extension field of a trigger frame, and the second field is a reserved field of the trigger frame.

17. The apparatus of claim 14, wherein a trigger frame comprises a plurality of special user fields, each special user field indicating a bandwidth of a TB PPDU.

18. The apparatus of claim 11, wherein the processing unit is further configured to generate a very high throughput long training EHT-LTF sequence based on the indication information; the transceiver unit is further configured to transmit the EHT-LTF sequence to the access point.

19. The apparatus of claim 15 or 18, wherein the processing unit is further configured to generate an EHT-LTF sequence based on the indication information, comprising:

20. The apparatus of claim 12, wherein the transceiver unit is further configured to receive an EHT-LTF sequence from the station, and wherein the processing unit is further configured to perform channel estimation based on the EHT-LTF sequence, the EHT-LTF sequence being determined by the indication information.

21. A station comprising a memory and a processor;

the memory to store instructions;

the processor configured to execute the instructions such that the method of any one of claims 1, 3 to 9 is performed.

22. An access point comprising a processor and an interface;

the memory to store instructions;

the processor configured to execute the instructions so that the method of any one of claims 2, 3 to 7, 10 is performed.

23. A communication system comprising a station according to claim 21 and an access point according to claim 22.