KR20230078491A - A station and an access point performing wlan based communication, and an operation method thereof - Google Patents

Abstract

According to an aspect of a technical idea of the present disclosure, a station (STA) communicating with an access point (AP) in a wireless local area network (WLAN) system comprises: a transceiver; and a processing circuit. The transceiver supports transceiving up to a first bandwidth, and receives a first physical layer protocol data unit (PPDU) corresponding to a second bandwidth wider than the first bandwidth. The processing circuit supports a wider bandwidth by performing a process of obtaining a second PPDU assigned to the STA within the first bandwidth from the first PPDU. The processing circuit controls the transceiver to transmit first performance information indicating first MCSs supported in the wider bandwidth to the AP depending on a performance of the STA among a plurality of MCSs. The present invention can improve a communicating performance of the STA for supporting the wider bandwidth.

Description

Station and access point performing WLAN-based communication, method of operation thereof

The technical idea of the present disclosure relates to wireless communication, and more particularly, to a wireless local area network (WLAN) based communication station and access point, and their operating method.

In the PHY layer of the next-generation WLAN, various technologies have been proposed to increase frequency spectrum efficiency and transmission rate. As an example, it is decided to support a wide bandwidth (eg, a bandwidth of 320 MHz) to increase the data transmission rate in WLAN-based communication, and to increase the efficiency of the frequency spectrum, multiple RUs (resource units (RUs) are bundled and transmitted) multiple RU) allocation scheme has been proposed.

In particular, as long as the bandwidth of the PPDU (physical packet data unit) transmitted in the previous WLAN-based communication system and the bandwidth supportable by the station (hereinafter referred to as STA) are the same, the access point (hereinafter referred to as AP) ) supports multiple access, but even if the bandwidth of the PPDU transmitted in the recent WLAN-based communication system and the bandwidth supportable by the STA are not the same, the AP transmits the PPDU to the STA, and the STA allocates it to itself from the PPDU It is possible to increase frequency spectrum efficiency by supporting an operation of acquiring a PPDU. An STA performing the above operation may be defined as supporting a wider bandwidth, and research is being actively conducted to help the STA perform an efficient and effective operation when supporting a wider bandwidth. there is.

The problem to be solved by the technical idea of the present disclosure is that the STA transmits performance information in a wider bandwidth to the AP, and the AP generates a PPDU suitable for the STA based on the performance information of the STA and transmits it to the STA. STA in a WLAN system and APs, and their operating methods.

In order to achieve the above object, a station (STA) communicating with an access point (AP) in a wireless local area network (WLAN) system according to an aspect of the technical idea of the present disclosure supports transmission and reception up to the first bandwidth and a transceiver configured to receive a first physical layer protocol data unit (PPDU) corresponding to a second bandwidth wider than the first bandwidth and a first allocated to the STA within the first bandwidth from the first PPDU 2 A processing circuit configured to support a wide bandwidth by performing an operation of acquiring PPDUs, wherein the processing circuit includes a first supportable in the wide bandwidth according to the performance of the STA among a plurality of MCSs 1 characterized in that it is configured to control the transceiver to transmit first capability information indicating MCSs to the AP.

An AP communicating with an STA that supports transmission and reception up to a first bandwidth in a WLAN system according to another aspect of the technical idea of the present disclosure selects a plurality of MCSs from the STA according to the performance of the STA. 1 Receiving performance information indicating MCSs, selecting one of the first MCSs based on a transceiver configured to transmit a first PPDU to the STA and the performance information and a channel state with the STA, and selecting the first and a processing circuit configured to generate a second PPDU based on an MCS, wherein the first PPDU includes the second PPDU and conforms to a second bandwidth wider than the first bandwidth.

A method of operating an STA communicating with an AP in a WLAN system according to another aspect of the technical idea of the present disclosure includes performance information indicating first MCSs supportable in a wider bandwidth according to the performance of the STA among a plurality of MCSs. Transmitting to an AP, receiving a first PPDU conforming to a second bandwidth wider than the first bandwidth maximally supported by the STA, and to which an MCS conforming to the performance information among the first MCSs is applied, and the Y and performing an operation of acquiring a second PPDU allocated to the STA within the first bandwidth from the first PPDU to support a more bandwidth.

A method of operating an AP communicating with an STA in a WLAN system according to another aspect of the technical idea of the present disclosure includes performance information indicating first MCSs supportable in a wider bandwidth according to the performance of the STA among a plurality of MCSs, Receiving from an STA, selecting one of the first MCSs based on the performance information and a channel state with the STA, generating a second PPDU based on the selected first MCS, and the second and transmitting to the STA a first PPDU including a PPDU and conforming to a second bandwidth wider than the first bandwidth.

The STA according to an exemplary embodiment of the present disclosure may generate a PPDU allocated to the STA by selecting an MCS suitable for the performance of the STA by providing the AP with performance information related to the support of the wider bandwidth. Accordingly, the STA can effectively obtain a PPDU allocated to it from a PPDU corresponding to a bandwidth wider than the maximum supportable bandwidth during transmission and reception, and as a result, communication performance of the STA supporting the wider bandwidth can be improved.

In addition, the AP according to an exemplary embodiment of the present disclosure schedules the PPDU allocated to the STA using the remaining RUs excluding RUs that may cause problems such as aliasing when the STA supports the wider bandwidth, so that the STA It can effectively acquire the PPDU allocated to itself in a higher bandwidth.

Effects obtainable in the exemplary embodiments of the present disclosure are not limited to the effects mentioned above, and other effects not mentioned are common knowledge in the art to which exemplary embodiments of the present disclosure belong from the following description. can be clearly derived and understood by those who have That is, unintended effects according to the implementation of the exemplary embodiments of the present disclosure may also be derived by those skilled in the art from the exemplary embodiments of the present disclosure.

1 is a block diagram illustrating a wireless communication system according to an exemplary embodiment of the present disclosure.
2 is a block diagram illustrating a wireless communication system according to an exemplary embodiment of the present disclosure.
3A and 3B are block diagrams for explaining the operation of a wireless communication system according to an exemplary embodiment of the present disclosure.
4 is a graph illustrating a relationship between an MCS and an error rate of a PPDU allocated to an STA supporting a wider bandwidth.
5A is a diagram illustrating 'enhancements for extremely high throughput (EHT) Capabilities element format' for delivering performance information according to an exemplary embodiment of the present disclosure, and FIGS. 5B and 5C are diagrams according to an exemplary embodiment of the present disclosure. It is a diagram showing an 'EHT PHY Capabilities Information' field for delivering performance information according to FIG.
6 is a flowchart illustrating a method of operating an AP and an STA according to an exemplary embodiment of the present disclosure.
7A is a diagram illustrating first performance information according to an exemplary embodiment of the present disclosure, and FIG. 7B is a diagram for explaining performance of an STA indicated by the first performance information of FIG. 7A.
8A is a diagram illustrating first performance information according to an exemplary embodiment of the present disclosure, and FIG. 8B is a diagram for explaining performance of an STA indicated by the first performance information of FIG. 8A.
9A is a diagram illustrating first performance information according to an exemplary embodiment of the present disclosure, and FIG. 9B is a diagram for explaining performance of an STA indicated by the first performance information of FIG. 9A.
10A is a diagram illustrating first performance information according to an exemplary embodiment of the present disclosure, and FIG. 10B is a diagram for explaining performance of an STA indicated by the first performance information of FIG. 10A.
11A to 11C are diagrams illustrating first performance information according to exemplary embodiments of the present disclosure.
12 is a flowchart illustrating a specific exemplary embodiment of step S120 of FIG. 6 .
13A is a diagram illustrating a 'Supported EHT-MCS And NSS Set' field for delivering first capability information according to an exemplary embodiment of the present disclosure, and FIGS. 13B and 13C are STA capabilities indicated by the first capability information. It is a drawing for explaining about.
14 is a diagram illustrating a 'Supported EHT-MCS And NSS Set' field for delivering first capability information according to an exemplary embodiment of the present disclosure.
15 is a flowchart illustrating a specific exemplary embodiment of step S120 of FIG. 6 .
16A is a diagram illustrating first performance information according to an exemplary embodiment of the present disclosure, and FIG. 16B is a diagram for explaining performance of an STA indicated by the first performance information of FIG. 16A.
17 is a flowchart illustrating a method of operating an AP according to an exemplary embodiment of the present disclosure.
18A and 18B are diagrams for explaining a method of scheduling a second PPDU allocated to an STA supporting a wider bandwidth of an AP according to exemplary embodiments of the present disclosure.
19 is a conceptual diagram illustrating an IoT network system to which exemplary embodiments of the present disclosure are applied.

1 is a block diagram illustrating a wireless communication system 100 according to an exemplary embodiment of the present disclosure.

Hereinafter, exemplary embodiments of the present disclosure are described based on a wireless local area network (WLAN)-based wireless communication system 100, in particular, an IEEE release, but the technical spirit of the present disclosure is not limited to WLAN, and the present The technical idea of the disclosure is other wireless communication systems (eg, new radio (NR), long term evolution (LTE), LTE-advanced (LTE-A), wireless broadband (WiBro)) having a similar technical background or channel configuration , GSM (global system for mobile communication), cellular communication systems such as next-generation communication such as 6G, or short-range communication systems such as Bluetooth and near field communication (NFC)).

In addition, various functions described below may be implemented or supported by artificial intelligence technology or one or more computer programs, each of which is composed of computer readable program code and implemented in a computer readable medium. do. The terms "application" and "program" refer to one or more computer programs, software components, sets of instructions, procedures, functions, objects, classes, instances, related data, or portions thereof suitable for implementation in suitable computer readable program code. The term "computer readable program code" includes all types of computer code, including source code, object code, and executable code. The term "computer readable medium" means a computer memory, such as read only memory (ROM), random access memory (RAM), hard disk drive, compact disc (CD), digital video disc (DVD), or any other type of memory. Includes all types of media that can be accessed by A “non-transitory” computer readable medium excludes wired, wireless, optical, or other communication links that transmit transitory electrical or other signals. Non-transitory computer readable media include media on which data can be permanently stored, and media on which data can be stored and later overwritten, such as rewritable optical discs or removable memory devices.

In exemplary embodiments of the present disclosure described below, a hardware access method is described as an example. However, since exemplary embodiments of the present disclosure include technology using both hardware and software, exemplary embodiments of the present disclosure do not exclude software-based access methods.

Referring to FIG. 1 , a wireless communication system 100 may include a plurality of access points (APs) 101 and 103 and a plurality of stations (stations) 111 to 114. Specifically, the APs 101 and 103 may communicate with at least one network 130 such as the Internet or an IP (internet protocol) network.

The APs 101 and 103 may provide wireless access to the network 130 so that the STAs 111 to 114 within their respective coverage areas 120 and 125 may use communication services. For example, the APs 101 and 103 may communicate with each other using wireless fidelity (WiFi) or other WLAN communication technologies. In addition, the APs 101 and 103 may communicate with the plurality of STAs 111 to 114 using WiFi or other WLAN communication technologies.

For reference, depending on the type of network, other well-known terms such as "router" and "gateway" may be used instead of AP. Also, in a WLAN, an AP may be provided for a radio channel. An AP may be identified as an STA for other APs according to operations. An AP of the present disclosure may also be referred to as a device, a wireless device, a communication device, and the like.

In addition, according to the network type, the STA is a mobile station, a subscriber station, a remote terminal, a user equipment, a wireless terminal, a user device, Alternatively, it may be used in place of other well-known terms such as user. For convenience, the term STA is used in this document to denote a remote wireless device that wirelessly accesses an AP or accesses a wireless channel within a WLAN. An STA may be identified as an AP on the side of another STA according to its operation. An STA of the present disclosure may also be referred to as a device, a wireless device, a communication device, and the like.

As an exemplary embodiment, the APs 101 and 103 may be included in different devices or may be included in one device (AP multiple link device (MLD)). In addition, the STAs 111 to 114 may be included in different devices or included in one device (non-AP MLD).

Dotted lines show the approximate extent of the coverage areas 120 and 125 . Here, coverage areas 120 and 125 are shown approximately circular for purposes of explanation and illustration. However, the coverage areas 120 and 125 associated with the APs 101 and 103 have different shapes reflecting various changes in the wireless environment related to natural or artificial obstructions, or the APs 101 and 103 ) may have other shapes, including irregular shapes.

On the other hand, and FIG. 1 only shows an example of a wireless communication system 100, but the embodiments of the present disclosure are not limited thereto.

For example, the wireless communication system 100 may include any number of APs and any number of STAs, any suitably arranged. Additionally, AP 101 can communicate directly with any number of STAs. Specifically, the AP 101 may provide wireless broadband access with the network 130 to the STAs 111 to 114 .

Similarly, APs 101 and 103 may each communicate directly with network 130 and provide network 130 with wireless broadband access to STAs 111 - 114 . In addition, the APs 101 and 103 may implement connections with various external networks such as an external telephone network or data network. Hereinafter, in order to describe exemplary embodiments of the present disclosure, the configuration and operation of the AP 101 and the STA 111 are mainly described, and the described embodiments are the rest of the AP 103 and the STAs 112 to 114 ) can also be applied.

As an exemplary embodiment of the present disclosure, the STA 111 provides a wider bandwidth (or, wide bandwidth or large) to the connected AP 101 to perform WLAN-based communication. bandwidth) can transmit its own performance information for support. In this specification, the fact that the STA supports the wider bandwidth means that when the STA receives a first PPDU (physical packet data unit) corresponding to a second bandwidth that is wider than the maximum supportable first bandwidth, from the first PPDU to itself This may mean that the allocated second PPDU can be obtained. Meanwhile, in this specification, the fact that the STA receives a first PPDU corresponding to a second bandwidth wider than the maximum supportable first bandwidth can be understood as the STA receiving a part of the first PPDU corresponding to the first bandwidth. there is.

In this specification, the first PPDU refers to a PPDU corresponding to a second bandwidth wider than the maximum supportable first bandwidth when transmitted and received by an STA, and the second PPDU refers to a PPDU allocated to the STA within the first PPDU do. In addition, the first PPDU may further include at least one of PPDUs respectively allocated to the other STAs 112 to 114.

Meanwhile, the STA 111 performs sampling at a sampling rate as high as an integer multiple of the sampling rate corresponding to the maximum supportable first bandwidth for the received first PPDU in order to support the wider bandwidth, and performs a predetermined sampling rate on the sampling result. Filtering may be performed with a decimation filter having a pass band of , and the second PPDU may be obtained by down-sampling the filtering result at a sampling rate corresponding to the first bandwidth.

As a specific example, when the first bandwidth is 80 MHz and the second bandwidth is 160 MHz, the STA 111 performs sampling on the first PPDU at a sampling rate twice that of the sampling rate corresponding to 80 MHz, and passes the pass corresponding to 80 MHz. A second PPDU may be obtained by performing filtering with a decimation filter having a band and down-sampling the filtering result at a sampling rate corresponding to 80 MHz.

In addition, when the first bandwidth is 80 MHz and the second bandwidth is 320 MHz, the STA 111 performs first sampling on the first PPDU at a sampling rate four times the sampling rate corresponding to 80 MHz, and for the first sampling result First filtering may be performed with a decimation filter having a pass band corresponding to 160 MHz, and first down-sampling may be performed on the first filtering result at a sampling rate corresponding to 160 MHz. The STA 111 performs second sampling at a sampling rate twice the sampling rate corresponding to 80 MHz for the first down-sampling result, and filters the second sampling result with a decimation filter having a pass band corresponding to 80 MHz. and performing second down-sampling on the second filtering result at a sampling rate corresponding to 80 MHz to obtain a second PPDU.

When the STA 111 performs filtering and down-sampling to obtain the second PPDU from the first PPDU, a side lobe is generated by a non-ideal decimation filter, and the side lobe is down-sampled In the process, aliasing may be caused to degrade the quality of the second PPDU. In addition to this, side lobes may also occur due to the limited performance of the STA 111, for example, the quality of the sampling clock, thereby degrading the quality of the second PPDU.

When the performance of the STA 111 is good, even if a modulation and coding scheme (MCS) having a high data rate is applied to the second PPDU, the STA 111 can smoothly obtain the second PPDU, but the STA If the performance of (111) is poor and an MCS having a high data rate is applied to the second PPDU, the STA 111 may not be able to acquire the second PPDU. In this specification, that the STA obtains the PPDU may also be interpreted as successfully extracting data from the PPDU by successfully demodulating and/or decoding the PPDU. Accordingly, when the AP 101 generates the second PPDU, the STA 111 may transmit its performance information to the AP 101 so that the performance of the STA 111 in the wider bandwidth may be considered. . As an exemplary embodiment, the performance of the STA 111 may be determined according to the sharpness of the decimation filter. In some embodiments, the performance of the STA 111 may also be determined according to the quality of the sampling clock. However, this is only an exemplary embodiment, and is not limited thereto, and the performance of the STA 111 may be determined by various factors used in operations performed to support the wider bandwidth.

As an exemplary embodiment, the performance information transmitted by the STA 111 to the AP 101 is first, indicating first MCSs that the STA 111 can support in the wider bandwidth according to its own performance among a plurality of MCSs. May contain performance information. The AP 101 may select one of the first MCSs based on the first capability information and generate a second PPDU allocated to the STA 111 based on the selected first MCS. The AP 101 may transmit the first PPDU including the second PPDU to the STA 111.

In some embodiments, the performance information may include second performance information indicating whether the STA 111 can support a wider bandwidth. The AP 101 confirms that the STA 111 can support the wider bandwidth based on the second performance information, and transmits the first PPDU including the second PPDU allocated to the STA 111 to the STA 111 can do.

In an exemplary embodiment, the performance information may be transmitted from the STA 111 to the AP 101 through at least one field among fields defined in IEEE P802.11be. Specifically, the performance information is transmitted through some fields in which information is not included because it does not match the performance of the STA 111 among the fields of IEEE P802.11be, or a 'reserved' subfield included in some of the fields can be transmitted through

The STA 111 according to an exemplary embodiment of the present disclosure provides wider bandwidth support-related performance information to the AP 101 so that the AP 101 selects an MCS suitable for the performance of the STA 111 and A second PPDU allocated to may be generated. Accordingly, the STA 111 can effectively obtain a second PPDU from the first PPDU corresponding to a second bandwidth wider than the maximum supportable first bandwidth in transmission and reception, and as a result, the STA 111 supporting the wider bandwidth The communication performance of can be improved.

Meanwhile, in some embodiments, the STA 111 may include a computer program product used for communication with the AP 101. The computer program product may include a non-transitory computer-accessible storage medium, which is a non-transitory computer-accessible storage medium in which operations according to exemplary embodiments of the present disclosure are performed in the STA 111. It may include code executable by at least one computer to be executed. At least one computer may correspond to the processing circuit 223 of FIG. 2 to be described later.

2 is a block diagram illustrating a wireless communication system 200 according to an exemplary embodiment of the present disclosure. Specifically, the block diagram of FIG. 2 shows the AP 210 and the STA 220 communicating with each other in the wireless communication system 200 . Each of the AP 210 and the STA 220 of FIG. 2 may be any device that communicates in the wireless communication system 200 and may be referred to as a device for wireless communication. In some embodiments, the AP 210 may be one of a plurality of APs included in the AP MLD, and the STA 220 may be any one of a plurality of STAs included in the non-AP MLD.

Referring to FIG. 2 , an AP 210 may include an antenna 211 , a transceiver 212 and a processing circuit 213 . In some embodiments, antenna 211, transceiver 212, and processing circuit 213 may be included in one package or may be included in different packages, respectively. The STA 220 may also include an antenna 221 , a transceiver 222 and processing circuitry 223 . Hereinafter, overlapping descriptions of the AP 210 and the STA 220 will be omitted.

The antenna 211 may receive a signal from the STA 220 and provide the signal to the transceiver 212 , and may transmit the signal provided from the transceiver 212 to the STA 220 . In some embodiments, antenna 211 may include multiple antennas for multiple input multiple output (MIMO). Also, in some embodiments, the antenna 211 may include a phased array for beamforming.

The transceiver 212 may process a signal received from the STA 220 through the antenna 211 and provide the processed signal to the processing circuit 213 . Also, the transceiver 212 may process a signal provided from the processing circuit 213 and output the processed signal through the antenna 211 . In some embodiments, transceiver 212 may include analog circuitry such as a low noise amplifier, mixer, filter, power amplifier, oscillator, and the like. In some embodiments, transceiver 212 may process the signal received from antenna 211 and/or the signal received from processing circuit 213 based on control of processing circuit 213 .

The processing circuit 213 may extract information transmitted by the STA 220 by processing a signal received from the transceiver 212 . For example, processing circuit 213 may extract information by demodulating and/or decoding a signal received from transceiver 212 . In addition, a signal including information to be transmitted to the STA 220 may be generated and provided to the transceiver 212 . For example, the processing circuit 213 may provide a signal generated by encoding and/or modulating data to be transmitted to the STA 220 to the transceiver 212 . In some embodiments, the processing circuit 213 may include a programmable component such as a central processing unit (CPU), a digital signal processor (DSP), or the like, or a field programmable gate array (FPGA). It may include a reconfigurable component, and may include a component providing a fixed function, such as an IP (intellectual property) core. In some embodiments, processing circuitry 213 may include or access memory that stores data and/or a series of instructions. In this specification, transceiver 212 and/or processing circuitry 213 performing operations may simply refer to AP 210 performing those operations. Accordingly, operations performed by the AP 210 may be performed by the transceiver 212 and/or processing circuit 213 included in the access point, and operations performed by the STA 220 may be performed by the STA 220 It may be performed by the transceiver 221 and/or processing circuitry 224 included in .

The STA 220 may support transmission and reception up to a first bandwidth through the antenna 221 and the transceiver 222, and the STA 220 transmits a first PPDU corresponding to a second bandwidth wider than the first bandwidth to the antenna 221 ) and can be received using the transceiver 222. The processing circuit 223 may obtain a second PPDU allocated to the STA 220 from the first PPDU by performing an operation to support a wider bandwidth.

In an exemplary embodiment, processing circuitry 223 may manage performance information 224 related to supporting wider bandwidth. The performance information 224 is first performance information indicating the performance of the STA 220 when the STA 220 performs an operation to support the wider bandwidth and whether the STA 220 can support the wider bandwidth It may include at least one of the indicated second performance information.

As an exemplary embodiment, the first capability information may include information indicating first MCSs that the STA 220 may support when performing an operation for supporting a wider bandwidth among a plurality of MCSs. For example, the plurality of MCSs may include MCSs defined from index 0 to index 15 in the P802.11be standard specification.

The STA 220 may smoothly obtain a second PPDU generated based on any one of the first MCSs from the first PPDU, and may obtain a second PPDU generated based on any one of the remaining MCSs other than the first MCSs. It may be difficult to obtain a PPDU from the first PPDU. Accordingly, the STA 220 may inform the AP 210 of the state of the STA 220 by transmitting the first capability information to the AP 210 .

For example, the first performance information may include bits indicating whether each of the plurality of MCSs can be supported. This is described below in detail in FIGS. 7A and 7B.

For example, the first performance information may include bits indicating whether support is possible for each of specific MCSs having a data rate higher than a reference value among a plurality of MCSs. This is described in detail later in FIGS. 8A and 8B.

For example, the first performance information may include bits indicating a specific MCS having the highest data rate among the first MCSs. This is described below in detail in FIGS. 9A and 9B.

For example, the first performance information may include at least one bit indicating an offset from a specific MCS having the highest data rate among the second MCSs. In this specification, when the STA 220 receives a third PPDU conforming to a bandwidth less than or equal to the first supportable bandwidth for transmission and reception among a plurality of MCSs, the second MCSs are assigned to MCSs supportable by the STA 220. may apply. That is, the second MCSs may correspond to MCSs that can be supported when the STA 220 receives a third PPDU matching its transmission/reception performance. This is described later in detail in FIGS. 10A to 11C.

For example, the first capability information may include at least one bit indicating an offset from a specific MCS having at least one highest data rate among a plurality of MCS groups. In the present specification, a plurality of MCS groups may be grouped and distinguished between MCSs having the same maximum number of spatial streams in the second MCSs. This is described later in detail in FIGS. 13A to 13C.

For example, the first performance information may include information indicating first MCSs corresponding to each of possible values of the second bandwidth. Specifically, when the maximum supportable first bandwidth of the STA 220 is 80 MHz and the second bandwidth is 160 MHz or 320 MHz, the first performance information is the first MCSs when supporting a wider bandwidth corresponding to 160 MHz, and It may include information indicating each of the first MCSs when supporting a wider bandwidth corresponding to 320 MHz.

For example, the first performance information may include information indicating a rejection level additionally supportable by the STA 220 in relation to adjacent channel rejection levels associated with a plurality of MCSs. This is described later in detail in FIGS. 16A and 16B.

In an exemplary embodiment, the performance information 224 may be stored in non-volatile memory of the STA 220 and read from the processing circuitry 223 . The processing circuit 223 may control the transceiver 222 to transmit the read performance information 224 or a signal including the same to the AP 210 . In some embodiments, processing circuitry 223 may include first circuitry that manages capability information 224 and second circuitry that controls transceiver 222 to transmit capability information 224 to AP 210 . can That is, the first circuit that manages the performance information 224 may be implemented to be distinguished from the second circuit that controls the transceiver 222 .

In an exemplary embodiment, the processing circuitry 213 of the AP 210 may include a scheduler 214, which scheduler 214 receives from the STA 220 via the antenna 211 and the transceiver 212 One of the first MCSs may be selected based on the performance information, and a second PPDU allocated to the STA 220 may be generated based on the selected first MCS. In some embodiments, the scheduler 214 may estimate a channel state between the AP 210 and the STA 220 or may receive information about the estimated channel state from the STA 220, and may further transmit the estimated channel state In consideration of this, one of the first MCSs may be selected. Specifically, the scheduler 214 may generate the second PPDU by selecting the first MCS having the highest data rate among the first MCSs when the estimated channel condition is good, and generating the second PPDU when the estimated channel condition is bad. A second PPDU may be generated by selecting a first MCS having a low data rate among the first MCSs according to However, this is only an exemplary embodiment and is not limited thereto, and the scheduler 214 selects one of the first MCSs based on at least one of the performance information 224 and the channel state between the AP 210 and the STA 220. Either one may be selected to generate the second PPDU.

As an exemplary embodiment, the scheduler 214 may allocate the second PPDU to remaining RUs excluding RUs located at the boundary of the band among a plurality of RUs included in the band supported by the STA 220 . That is, since the side lobe and aliasing described in FIG. 1 are caused by subcarriers located at the band boundary, the second PPDU may not be allocated to RUs including these subcarriers. This is described later in detail in FIGS. 18A and 18B.

As an exemplary embodiment, the scheduler 214 may transmit the first PPDU including the second PPDU and meeting the second bandwidth to the STA 220 using the antenna 211 and the transceiver 212 . The first PPDU may further include a PPDU allocated to at least one other STA (not shown).

Meanwhile, in some embodiments, the processing circuits 213 and 223 may be referred to as processors, controllers, and the like.

3A and 3B are block diagrams illustrating the operation of a wireless communication system 300 according to an exemplary embodiment of the present disclosure.

Referring to FIG. 3A , a wireless communication system 300 may include an AP 310 , a first STA 320 and a second STA 330 . The first STA 320 can support up to the first bandwidth BW1 during transmission and reception, and the second STA 330 can support up to the second bandwidth BW2 during transmission and reception.

As an exemplary embodiment, the first STA 320 may transmit, to the AP 310, first capability information indicating first MCSs supportable in a wide bandwidth among a plurality of MCSs. The AP 310 generates a first PPDU based on the first capability information, transmits the first PPDU to the first STA 320 through a first channel CH1, and transmits the first PPDU through a second channel CH2. It can be transmitted to 2 STAs (330). The first PPDU corresponding to the second bandwidth BW2 may include the second PPDU allocated to the first STA 320 and may include the third PPDU allocated to the second STA 330 . The second PPDU may correspond to the first bandwidth BW1.

The second PPDU may be generated by applying an MCS selected according to the first capability information, and the selected MCS may be the same as or different from the MCS applied to the third PPDU. In some embodiments, the same MCS may be controlled to be used for generating the second and third PPDUs included in the first PPDU. For example, when the MCS used for generating the second PPDU is different from the MCS used for generating the third PPDU, the MCS having the lower data rate among the MCSs is commonly used for generating the second and third PPDUs. It can be. Alternatively, as another example, when the MCS used for generating the second PPDU is different from the MCS used for generating the third PPDU, an MCS having a high data rate among the MCSs may be commonly used for generating the second and third PPDUs. can be controlled so that

Referring further to FIG. 3B , the first STA 320 may transmit second capability information indicating whether a wider bandwidth can be supported to the AP 310 . The AP 310 refers to the second performance information, and when the first STA 320 does not support the wider bandwidth, the second PPDU corresponding to the first bandwidth BW1 and the second PPDU corresponding to the second bandwidth BW2 The third PPDU may be sequentially transmitted to the first STA 320 and the second STA 330, respectively.

4 is a graph showing a relationship between an error rate of a PPDU allocated to an STA supporting a wider bandwidth and an MCS. In FIG. 4, MCS0, MCS7, MCS9, and MCS11 refer to MCSs having indices of 0, 7, 9, and 11 defined in IEEE P802.11be. The modulation method and coding rate of MCS0 are BPSK (binary phase shift keying) and 1/2, the modulation method and coding rate of MCS7 are 64-QAM (quadrature amplitude modulation) and 5/6, and the modulation method and coding rate of MCS9 is 256-QAM and 5/6, and the modulation scheme and coding rate of MCS11 are 1024-QAM and 5/6. SU means a single user, and MU means multiple users. 'TX=RX=80' means that the bandwidth of the PPDU transmitted by the AP is 80 MHz, and the STA supports reception up to 80 MHz. 'TX=160/RX=80' means that the bandwidth of the PPDU transmitted by the AP is 160 MHz, and the STA supports reception of up to 80 MHz. In this case, the STA performs an operation to support the wider bandwidth.

Referring to FIG. 4, it can be confirmed that the packet error rate (PER) is not improved even if the signal to noise ratio (SNR) increases when any one of MCS7, MCS9, and MCS11 in the wider bandwidth is applied to the PPDU allocated to the STA. can The STA can support up to MCS11 when receiving a PPDU conforming to its reception performance of 80 MHz, but cannot support MCS7, MCS9, and MCS11 due to a relatively high PER when receiving a PPDU conforming to 160 MHz.

That is, the MCSs that can be supported in the wide bandwidth of the STA may be limited to those having a data rate lower than that of MCS7.

An STA according to an exemplary embodiment of the present disclosure may transmit performance information indicating MCSs supportable in a wide bandwidth to an AP in consideration of performance in a wide bandwidth. The AP may select an MCS applied to a PPDU allocated to an STA performing an operation for supporting a wider bandwidth based on performance information.

5A is a diagram illustrating 'enhancements for extremely high throughput (EHT) Capabilities element format' for delivering performance information according to an exemplary embodiment of the present disclosure, and FIGS. 5B and 5C are diagrams according to an exemplary embodiment of the present disclosure. It is a diagram showing an 'EHT PHY Capabilities Information' field for delivering performance information according to FIG.

Referring to FIG. 5A, 'EHT Capabilities element format' includes 'Elment' field, 'Length' field, 'Element ID Extension' field, 'EHT MAC Capabilities Information' field, 'EHT PHY Capabilities Information' field, 'Supported EHT- It may include an 'MCS And NSS Set' field and an 'EHT PPE Thresholds' field (optional). Fields of the 'EHT Capabilities element format' are defined in IEEE P802.11be, and detailed descriptions other than those related to the present disclosure are omitted.

As an exemplary embodiment, the STA's capability information in the wipe band may be included in any one of an 'EHT PHY Capabilities Information' field and a 'Supported EHT-MCS And NSS Set' field and transmitted to the AP. The number of bits included in each of the 'EHT PHY Capabilites Information' field and the 'Supported EHT-MCS And NSS Set' field may vary according to a representation method indicating the performance of the STA. However, since this is only an exemplary embodiment, the capability information may be transmitted to the AP using other fields of the 'EHT Capabilities element format'.

5B, the 'EHT PHY Capabilities Information' field includes 'Reserved' subfield, 'Support For 320MHz In 6GHz' subfield, 'Support For 242-tone RU In BW Wider Than 20MHz' subfield, 'NDP With 4x EHT-LTF And 3.2 μ GI' subfield, 'Partial Bandwidth UL MU-MIMO' subfield, 'SU Beamformer' subfield, 'SU Beamformee' subfield, 'Beamformee SS(≤80MHz)' subfield, Beamformee SS (=160MHz)' subfield, Beamformee SS(=320MHz)' subfield, 'Number Of Sounding Dimensions(≤80MHz)' subfield, 'Number Of Sounding Dimensions(=160MHz)' subfield, 'Number Of Sounding Dimensions( =320MHz)' subfield, 'Ng=16 SU Feedback' subfield, 'Ng=16 MU Feedback' subfield, 'Codebook Size (φ,ψ)={4, 2} SU Feedback' subfield, 'Codebook Size (φ,ψ)={7, 5} MU Feedback' subfield, 'Triggered SU Beamforming Feedback' subfield, 'Triggered MU Beamforming Partial BW Feedback' subfield, 'Triggered CQI Feedback' subfield, 'Partial Bandwidth DL MU -MIMO' subfield, 'PSR-Based SR Support' subfield, 'Power Boost Factor Support' subfield, 'EHT MU PPDU With 4x EHT-LTF And 3.8 μ GI' subfield, 'Max Nc' subfield, ' Non-Triggered CQI Feedback' subfield, 'Tx 1024-QAM And 4096-QAM < 242-tone RU Support' subfield, 'Rx 1024-QAM And 4096-QAM < 242-tone RU Support' subfield, 'PPE Thresholds' Present' subfield, 'Common Nominal Packet Padding' subfield, 'Maximum Number Of Supported EHT-LTFs' subfield, 'Support Of MCS 15' subfield, 'Support Of EHT DUP In 6GHz' subfield, 'Support For 20MHz' Operating STA Receiving NDP With Wider Bandwidth' subfield, 'Non-OFDMA UL MU-MIMO (BW≤80MHz)' subfield, 'Non-OFDMA UL MU-MIMO (BW=160MHz)' subfield, 'Non-OFDMA UL MU-MIMO(BW=320MHz)' subfield, 'MU Beamformer(BW≤80MHz)' subfield, 'MU Beamformer(BW=160MHz)' subfield, MU Beamformer(BW=320MHz)' subfield and 'Wider BW' Support' subfield.

As an exemplary embodiment, the 'Wider BW Support' subfield may include performance information of the STA. The 'Wider BW Support' subfield may consist of n bits, and n may be determined according to the number of bits constituting the performance information of the STA. As described above, the number of bits constituting the performance information of the STA may vary according to expression methods indicating the performance of the STA.

As an exemplary embodiment, the STA's performance information included in the 'Wider BW Support' subfield is first performance information indicating first MCSs that the STA can support in the wider bandwidth and whether the STA can support the wider bandwidth. It may include at least one of the second performance information indicating .

Referring further to FIG. 5C, as in FIG. 5B, the 'Wider BW Support' subfield for transmitting the STA's performance information to the AP is not separately defined, and the specific Subfields may contain STA performance information instead of null data and be transmitted to the AP. For example, when null data is scheduled to be filled in the 'Support for 242-tone RU In BW Wider Than 20 MHz' subfield, performance information of the STA may be included instead of null data and transmitted to the AP. However, since this is only an exemplary embodiment, it is not limited thereto, and in a specific situation, performance information of the STA may be included in another subfield and transmitted to the AP.

Meanwhile, hereinafter, embodiments in which the STA transmits first performance information indicating first MCSs supportable in the wider bandwidth to the AP will be described on the premise that the wider bandwidth is supported.

6 is a flowchart illustrating an operation method of the AP 410 and the STA 420 according to an exemplary embodiment of the present disclosure.

Referring to FIG. 6 , in step S110, the STA 420 may transmit first capability information for supporting the wider bandwidth to the AP 410. As an exemplary embodiment, the first capability information may indicate first MCSs supportable by the STA 420 in a wider bandwidth. In step S120, the AP 410 may select one of the first MCSs based on the first capability information. As an exemplary embodiment, the AP 410 may select a first MCS having the highest data rate among the first MCSs. In some embodiments, the AP 410 may select one of the first MCSs by additionally considering a channel state with the STA 420 . The channel state may be estimated by the AP 410 based on the sounding reference signal received from the STA 420 or may be estimated by the STA 420 and reported to the AP 410 as feedback. In step S130, the AP 410 may generate a second PPDU allocated to the STA 420 based on the selected first MCS. In step S140, the AP 410 may transmit the first PPDU including the second PPDU to the STA 420. The second bandwidth corresponding to the first PPDU may be wider than the first bandwidth corresponding to the second PPDU.

7A is a diagram illustrating first performance information according to an exemplary embodiment of the present disclosure, and FIG. 7B is a diagram for explaining performance of an STA indicated by the first performance information of FIG. 7A.

Referring to FIG. 7A , the first capability information may include 16 bits indicating whether each of MCS0 having index 0 and MCS15 having index 15 defined in IEEE P802.11be is supportable. For example, if the STA can support MCS0, the value of the corresponding bit may be set to '1', and if the STA cannot support it, the value of the corresponding bit may be set to '0'. However, this is only an example, and is not limited thereto. If the STA can support MCS0, the value of the corresponding bit may be set to '0', and if the STA cannot support it, the value of the corresponding bit is ' It can be set to 1'.

Further referring to FIG. 7B, MCSs are arranged in a direction in which the data rate increases. Embodiments of the present disclosure are described on the premise of an operation of an AP and an STA that identifies MCSs based on the MCSs listed in the above direction. For the AP and STA, the modulation scheme and coding rate of MCS14 with index 14 are BPSK-DCM-DUP and 1/2, the modulation scheme and coding rate of MCS15 with index 15 are BPSK-DCM and 1/2, and index 0 The modulation scheme and coding rate of MCS0 with index 1 are BPSK and 1/2, the modulation scheme and coding rate of MCS1 with index 1 are QPSK and 1/2, and the modulation scheme and coding rate of MCS2 with index 2 are QPSK ( quadrature phase shift keying) and 3/4, the modulation scheme and coding rate of MCS3 with index 3 are 16-QAM and 1/2, and the modulation scheme and coding rate of MCS4 with index 4 are 16-QAM and 3/ 4, the modulation scheme and coding rate of MCS5 with index 5 are 64-QAM and 2/3, the modulation scheme and coding rate of MCS6 with index 6 are 64-QAM and 3/4, and MCS7 with index 7 The modulation scheme and coding rate of are 64-QAM and 5/6, the modulation scheme and coding rate of MCS8 with index 8 are 256-QAM and 3/4, and the modulation scheme and coding rate of MCS9 with index 9 are 256 -QAM and 5/6, the modulation scheme and coding rate of MCS10 with index 10 are 1024-QAM and 3/4, the modulation scheme and coding rate of MCS11 with index 11 are 1024-QAM and 5/6, The modulation scheme and coding rate of MCS12 with index 12 may be 4096-QAM and 3/4, and the modulation scheme and coding rate of MCS13 with index 13 may be 4096-QAM and 5/6.

The AP may identify first MCSs that the STA can support in the wide bandwidth from among MCS0 to MCS15 based on the first capability information.

Meanwhile, it will be fully understood that other MCSs may be additionally defined in addition to the MCSs defined in FIG. 7B, and the technical idea of the present disclosure may be applied to other MCSs.

8A is a diagram illustrating first performance information according to an exemplary embodiment of the present disclosure, and FIG. 8B is a diagram for explaining performance of an STA indicated by the first performance information of FIG. 8A.

Referring to FIG. 8A, the first performance information may include bits indicating whether each of specific MCSs having a data rate higher than a reference value among MCS0 to MCS15 defined in IEEE P802.11be can be supported. For example, specific MCSs may include MCS12 and MCS13, and in this case, the first performance information may include two bits. As an exemplary embodiment, specific MCSs indicating whether the first capability information is supported may be variously determined in advance, and specific MCSs may be identified in advance by the AP and the STA.

Further referring to FIG. 8B , the AP may identify whether the STA can support MCS12 and MCS13 respectively in the wider bandwidth based on the first capability information. Meanwhile, the AP may identify that the STA can support MCS0 to MCS11, MCS14, and MCS15 having a data rate lower than MCS12 in the wide bandwidth.

9A is a diagram illustrating first performance information according to an exemplary embodiment of the present disclosure, and FIG. 9B is a diagram for explaining performance of an STA indicated by the first performance information of FIG. 9A.

Referring to FIG. 9A , the first performance information may include bits indicating a specific MCS having the highest data rate among MCS0 to MCS15 defined in IEEE P802.11be. For example, the number of MCSs defined in IEEE P802.11be is 16, and the first performance information may include 4 bits to indicate a specific MCS.

Referring further to FIG. 9B, when a specific MCS is MCS11, the AP supports MCS0 to MCS11, MCS14, and MCS15 having a data rate less than or equal to the data rate of MCS11 based on the first performance information, which the STA can support in the wider bandwidth It can be identified as the first MCSs. That is, the AP may identify that the STA cannot support MCS12 and MCS13 in the wider bandwidth based on the first capability information.

10A is a diagram illustrating first performance information according to an exemplary embodiment of the present disclosure, and FIG. 10B is a diagram for explaining performance of an STA indicated by the first performance information of FIG. 10A. 10A shows information indicating second MCSs supportable by the STA among MCS0 to MCS15 defined in IEEE P802.11be when the STA receives a third PPDU conforming to a bandwidth equal to or less than the first supportable bandwidth during transmission and reception. It is assumed that transmission to the AP is performed through the 'Supported EHT-MCS And NSS Set' field of FIG. 5A. For example, information indicating the second MCSs may be included in the 'EHT-MCS Map (BW≤80MHz, Except 20 MHz-Only Non-AP STA)' subfield of the 'Supported EHT-MCS And NSS Set' field. Meanwhile, for convenience of description, the second MCSs may be referred to as MCSs that the STA can support in a normal bandwidth.

Referring to FIG. 10A, the first performance information may include relative MCS information. The relative MCS information may include at least one bit indicating an offset from a specific MCS having the highest data rate among the second MCSs. The first performance information may include the number of bits determined according to the range of the offset. For example, the first performance information may include 2 bits when the offset may have any one of a value of 0 to 3.

Referring further to FIG. 10B, when the offset has a value of 2 and the second MCS having the highest data rate among the second MCSs supportable by the STA in the normal bandwidth is MCS12, the AP based on the first performance information , MCS0 to MCS10, MCS14, and MCS15 having a data rate less than or equal to the data rate of MCS10 separated by 2 from MCS12 may be identified as first MCSs supportable by the STA in the wide bandwidth.

11A to 11C are diagrams illustrating first performance information according to exemplary embodiments of the present disclosure. As described above in FIG. 11A, it is assumed that the STA supports a first bandwidth of up to 80 MHz, and that a second bandwidth wider than the first bandwidth may have a value of either 160 MHz or 320 MHz. However, since this is only an exemplary embodiment, the technical spirit of the present disclosure is not limited thereto. In addition, in FIGS. 11A to 11C, overlapping content with FIG. 10A is omitted.

Referring to FIG. 11A, the first performance information may include information indicating first MCSs corresponding to values that a second bandwidth in a wider bandwidth may have. For example, when the second bandwidth is 160 MHz, the first performance information indicates information indicating first MCSs that the STA can support in the wider bandwidth and when the second bandwidth is 320 MHz, the first MCS that the STA can support in the wider bandwidth may contain information pointing to them.

As an exemplary embodiment, the AP may precisely select an MCS for generating a PPDU allocated to the STA in consideration of the performance of the STA subdivided according to the value of the second bandwidth based on the first performance information.

Referring further to FIG. 11B, the first capability information may include information indicating an offset from an MCS conforming to 1024-QAM in a normal bandwidth and information indicating an offset from an MCS conforming to 4096-QAM in a normal bandwidth. can

As an exemplary embodiment, the AP may precisely select an MCS for generating a PPDU allocated to the STA in consideration of the performance of the STA subdivided for each MCS based on the first performance information.

Referring further to FIG. 11C, when the second bandwidth is 160 MHz, the first performance information is information representing an offset from an MCS conforming to 1024-QAM in a normal bandwidth and an MCS conforming to 4096-QAM in a normal bandwidth. Includes information indicating an offset, and when the second bandwidth is 320 MHz, information indicating an offset from an MCS conforming to 1024-QAM in a normal bandwidth and information indicating an offset from an MCS conforming to 4096-QAM in a normal bandwidth can include

12 is a flowchart illustrating a specific exemplary embodiment of step S120 of FIG. 6 .

Referring to FIG. 12 , in step S121a following step S110 of FIG. 6 , the AP 410 may apply first capability information to information related to the maximum number of spatial streams for each MCS. In step S122a, the AP 410 may identify first MCSs that the STA 420 can support in the wide bandwidth based on the result in step S121a. In step S123a, the AP 410 may select one of the first MCSs to generate a PPDU allocated to the STA 420. Details of the embodiment of FIG. 12 are described in FIGS. 13A to 13C.

13A is a diagram illustrating a 'Supported EHT-MCS And NSS Set' field for delivering first capability information according to an exemplary embodiment of the present disclosure, and FIGS. 13B and 13C are STA capabilities indicated by the first capability information. It is a drawing for explaining about.

Referring to FIG. 13A, the 'Supported EHT-MCS And NSS Set' field includes the 'EHT-MCS Map (20MHz-Only Non-AP STA)' subfield, the 'EHT-MCS Map (BW≤80MHz, Except 20 MHz-Only Non-AP STA)' subfield, 'EHT-MCS Map (BW=160MHz)' subfield, and 'EHT-MCS Map (BW=320MHz)' subfield. Since the 'Supported EHT-MCS And NSS Set' field is defined in IEEE P802.11be, detailed descriptions other than those related to the present disclosure are omitted.

The 'EHT-MCS Map (BW≤80MHz, Except 20 MHz-Only Non-AP STA)' subfield may include information on the maximum associated number of spatial streams for each MCS of FIG. 12 .

'EHT-MCS Map (BW≤80MHz, Except 20 MHz-Only Non-AP STA)' subfield is 'Rx Max Nss That Supports EHT-MCS 0-9' subfield, 'Tx Max Nss That Supports EHT-MCS 0 -9' subfield, 'Rx Max Nss That Supports EHT-MCS 10-11' subfield, 'Tx Max Nss That Supports EHT-MCS 10-11' subfield, 'Rx Max Nss That Supports EHT-MCS 12-13 ' subfield, and 'Tx Max Nss That Supports EHT-MCS 12-13' subfield. Meanwhile, Nss or NSS may mean Number of Spatial Stream.

Specifically, information on the maximum associated number of spatial streams for each MCS of FIG. 12 includes 'Rx Max Nss That Supports EHT-MCS 0-9' subfields, 'Rx Max Nss That Supports EHT-MCS 10-11' subfields, and 'Rx Max Nss That Supports EHT-MCS 10-11' subfields. Max Nss That Supports EHT-MCS 12-13' may be included across subfields.

The 'Rx Max Nss That Supports EHT-MCS 0-9' subfield indicates the maximum number of spatial streams that the STA can support in MCS0 to MCS9, and the 'Rx Max Nss That Supports EHT-MCS 10-11' subfield indicates MCS10 And indicates the maximum number of spatial streams that the STA can support in MCS11, and the 'Rx Max Nss That Supports EHT-MCS 12-13' subfield may indicate the maximum number of spatial streams that the STA can support in MCS12 and MCS13 . Meanwhile, although MCS14 and MCS15 are not shown in FIG. 13A, MCS14 and MCS15 may be processed according to MCS0 to MCS9.

Further referring to FIG. 13B, the value of the subfield may indicate the maximum number of spatial streams. For example, 'Rx Max Nss That Supports EHT-MCS 0-9' subfield, 'Rx Max Nss That Supports EHT-MCS 10-11' subfield, and 'Rx Max Nss That Supports EHT-MCS 12-13' subfield The value of may have from 0 to 15. When the value of the subfield is 0, it indicates that spatial multiplexing is not supported, and when the value of the subfield is 1 to 8, it indicates that the maximum number of spatial streams is 1 to 8, respectively. Meanwhile, the maximum number of spatial streams having subfield values of 9 to 15 may be in a 'Reserved' state.

13C, 'Rx Max Nss That Supports EHT-MCS 0-9' subfields, 'Rx Max Nss That Supports EHT-MCS 10-11' subfields, and 'Rx Max Nss That Supports EHT-MCS 12-13' subfields It is assumed that the values of are 4, 2, and 1, respectively, and the offset of the first performance information conforming to FIG. 10A is 1. That is, the STA supports up to 4 spatial streams when supporting MCS0 to MCS9 in normal bandwidth, supports up to 2 spatial streams when supporting MCS10 and MCS11 in normal bandwidth, and supports 1 when supporting MCS11 and MCS12 in normal bandwidth. It can support up to 2 spatial streams. Hereinafter, MCS0 to MCS9 may be included in a first MCS group, MCS10 and MCS11 included in a second MCS group, and MCS12 and MCS13 included in a third MCS group.

Referring to FIG. 13C , the first capability information may indicate an offset from a specific MCS having at least one highest data rate among the first to third MCS groups.

In the first case, the AP may apply the first capability information to the first to third MCS groups to identify first MCSs supportable by the STA in the wide bandwidth. That is, the AP is MCS0 to MCS8 having a data rate less than or equal to the data rate of MCS8 separated by 1 from MCS9 having the highest data rate among the first MCS group, and separated by 1 from MCS11 having the highest data rate among the second MCS group. MCS10 and MCS12 separated by 1 from MCS13 having the highest data rate among the third MCS group may be identified as first MCSs.

In the second case, the AP may identify the first MCSs by selectively applying the first capability information to the first MCS group supporting the largest number of four maximum spatial streams among the first to third MCS groups. That is, the AP may identify MCS0 to MCS8 and MCS10 to MCS13 having a data rate less than or equal to the data rate of MCS8 separated by 1 from MCS9 having the highest data rate among the first MCS group as the first MCSs.

In the third case, the AP may identify the first MCSs by selectively applying the first capability information to the third MCS group including the MCS having the highest data rate among the first to third MCS groups. That is, the AP may identify MCS12 and MCS0 to MCS11 separated by 1 from MCS13 having the highest data rate among the third MCS group as the first MCSs.

In the fourth case, the AP may identify the first MCSs by selectively applying the first performance information to second and third MCS groups including MCSs having a data rate equal to or higher than a reference value among the first to third MCS groups. there is. That is, the AP uses MCS10 separated by 1 from MCS11 having the highest data rate among the second MCS group, MCS12 separated by 1 from MCS13 having the highest data rate among the third MCS group, and MCS0 to MCS9 as first MCSs. can be identified.

However, this is only an exemplary embodiment, and is not limited thereto, and the AP applies the first performance information to at least one of the first to third MCS groups in various ways so that the STA can support the first MCSs can be identified.

14 is a diagram illustrating a 'Supported EHT-MCS And NSS Set' field for delivering first capability information according to an exemplary embodiment of the present disclosure.

14, the first performance information may be included in at least one of the 'EHT-MCS Map (BW = 160 MHz)' subfield and the 'EHT-MCS Map (BW = 320 MHz)' subfield and transmitted to the AP. there is. That is, at least one of the 'EHT-MCS Map (BW = 160 MHz)' subfield and the 'EHT-MCS Map (BW = 320 MHz)' subfield may be used to transmit the first capability information to the AP.

When the STA supports the first bandwidth of 80 MHz or less, the 'EHT-MCS Map (BW = 160 MHz)' subfield and the 'EHT-MCS Map (BW = 320 MHz)' subfield may be filled with null data. Accordingly, as an exemplary embodiment, the first performance information instead of null data is included in any one of the 'EHT-MCS Map (BW = 160 MHz)' subfield and the 'EHT-MCS Map (BW = 320 MHz)' subfield. may be transmitted to the AP.

As an exemplary embodiment, the first performance information configured identically or similarly to the method described in FIG. 11A includes an 'EHT-MCS Map (BW = 160 MHz)' subfield and an 'EHT-MCS Map (BW = 320 MHz)' subfield. It may be included in and transmitted to the AP. Specifically, information composed of bits B63_1 and B63_2 of FIG. 11A may be included in the 'EHT-MCS Map (BW=160MHz)' subfield, and information composed of bits B63_3 and B63_4 is 'EHT-MCS Map (BW=320MHz)'. ' Can be included in subfields.

15 is a flowchart illustrating a specific exemplary embodiment of step S120 of FIG. 6 .

Referring to FIG. 15 , in step S121b subsequent to step S110 of FIG. 6 , the AP 410 may apply first capability information to information related to minimum required adjacent channel cancellation levels. In step S122b, the AP 410 may identify first MCSs that the STA 420 can support in the wide bandwidth based on the result in step S121b. In step S123b, the AP 410 may select one of the first MCSs to generate a PPDU allocated to the STA 420. Details of the embodiment of FIG. 15 are described in FIGS. 16A and 16B.

16A is a diagram illustrating first performance information according to an exemplary embodiment of the present disclosure, and FIG. 16B is a diagram for explaining performance of an STA indicated by the first performance information of FIG. 16A.

Referring to FIG. 16A, the first performance information may include information indicating adjacent channel interference (ACI) cancellation performance of the STA. ACI cancellation performance may be associated with information related to minimum required adjacent channel cancellation levels defined in IEEE P802.11be. The ACI removal performance may be information indicating a removal level additionally supportable by the STA according to the performance of the STA.

16B, minimum required adjacent channel cancellation levels and non-adjacent channel cancellation levels may be determined for each MCS0 to MCS15, and the AP determines the minimum required adjacent channel cancellation levels and ratios for each STA from MCS0 to MCS15. Operation may be performed on the premise that adjacent channel cancellation levels can be supported. At this time, the STA may transmit first performance information indicating ACI removal performance to the AP so that the AP may perform an operation according to the performance of the STA.

For example, when the adjacent channel cancellation level measured by the STA is -9 (dB) and the ACI cancellation performance of the STA is -5 (dB), the AP determines the final adjacent channel cancellation level of the STA as -14 (dB) Thus, the STA can identify first MCSs that can be supported in the wider bandwidth. That is, the AP may identify MCS0 to MCS11, MCS 14, and MCS 15 as the first MCSs.

17 is a flowchart illustrating a method of operating an AP according to an exemplary embodiment of the present disclosure.

Referring to FIG. 17, in step S200, the AP may check the bandwidth of the STA. In step S210, the AP may determine whether the STA supports a wide bandwidth. Specifically, the AP may receive second capability information indicating whether a wide bandwidth is supported from the STA, and determine whether the STA supports a wide bandwidth based on the second capability information. When step S210 is 'YES', the AP may schedule the second PPDU allocated to the STA using the remaining RUs other than the boundary RUs within the supportable bandwidth of the STA. When step S210 is 'NO', the AP may schedule the second PPDU using RUs within the STA's supportable bandwidth. In step S240, the AP may transmit a first PPDU including a second PPDU and conforming to the second bandwidth.

18A and 18B are diagrams for explaining a method of scheduling a second PPDU allocated to an STA supporting a wider bandwidth of an AP according to exemplary embodiments of the present disclosure. 18A and 18B, it is assumed that the first bandwidth supportable by the STA is 80 MHz.

Referring to FIG. 18A, when the second PPDU allocated to the STA is included in the first PPDU corresponding to the second bandwidth of 160 MHz, the AP schedules RUs located at the boundary of a band having a bandwidth of 80 MHz so that they are not allocated to the STA. can That is, the AP may not use RUs located at the boundary of a band having a bandwidth of 80 MHz when transmitting the second PPDU allocated to the STA to the STA. For example, in the first PPDU corresponding to the second bandwidth of 160 MHz, the AP may schedule RU1, RU37, RU38, and RU74 among RUs having an RU size corresponding to a 26-tone RU so that they are not allocated to STAs. As another example, in the first PPDU corresponding to the second bandwidth of 160 MHz, the AP may schedule RU1, RU16, RU17, and RU32 among RUs having an RU size corresponding to a 52-tone RU so that they are not allocated to STAs. As another example, in the first PPDU corresponding to the second bandwidth of 160 MHz, the AP has MRUs having an MRU size corresponding to (106 + 26)-tone multiple RU (MRU), MRU1, MRU8, MRU9, and MRU16 to the STA It can be scheduled so that it is not allocated. As another example, in the first PPDU corresponding to the second bandwidth of 160 MHz, the AP has MRU2, MRU3, MRU4, MRU5, MRU6, and MRU7 among MRUs having an MRU size corresponding to (484 + 242)-tone MRU are STAs can be scheduled so that it is not assigned to

Referring further to FIG. 18B, the AP schedules so that RUs located at the boundary of a band having a bandwidth of 80 MHz are not allocated to the STA when the second PPDU allocated to the STA is included in the first PPDU corresponding to the second bandwidth of 320 MHz. can do. For example, in the first PPDU corresponding to the second bandwidth of 320 MHz, the AP assigns RU1, RU37, RU38, RU74, RU75, RU111, RU112, and RU148 among RUs having an RU size corresponding to a 26-tone RU to the STA. It can be scheduled to be unallocated. As another example, in the first PPDU corresponding to the second bandwidth of 320 MHz, the AP assigns RU1, RU16, RU17, RU32, RU33, RU48, RU49, and RU64 to the STA among RUs having an RU size corresponding to a 52-tone RU. It can be scheduled to be unallocated. As another example, in the first PPDU corresponding to the second bandwidth of 320 MHz, the AP selects MRU1, MRU8, MRU9, MRU16, MRU17, MRU24, MRU25 and MRUs among MRUs having an MRU size corresponding to (106+26)-tone MRU MRU32 may be scheduled so that it is not allocated to STAs. As another example, in the first PPDU corresponding to the second bandwidth of 320 MHz, the AP selects MRU2, MRU3, MRU4, MRU5, MRU6, MRU7, and MRU10 among MRUs having an MRU size corresponding to a (484+242)-tone MRU. , MRU11, MRU12, MRU13, MRU14, and MRU15 may be scheduled so that they are not allocated to STAs.

18A and 18B, RUs excluded from being allocated to STAs may vary according to types of RUs constituting the second PPDU.

19 is a conceptual diagram showing an IoT network system 1000 to which exemplary embodiments of the present disclosure are applied.

Referring to FIG. 19, the IoT network system 1000 includes a plurality of IoT devices 1100, 1120, 1140, and 1160, an access point 1200, a gateway 1250, a wireless network 1300, and a server 1400. can include The Internet of Things (IoT) may refer to a network between objects using wired/wireless communication.

Each of the IoT devices 1100, 1120, 1140, and 1160 may form a group according to characteristics of each IoT device. For example, IoT devices may be grouped into a home gadget group 1100, a home appliance/furniture group 1120, an entertainment group 1140, or a vehicle 1160 group. The plurality of IoT devices 1100 , 1120 , and 1140 may be connected to a communication network or to other IoT devices through the access point 1200 . The access point 1200 may be embedded in one IoT device. The gateway 1250 may change a protocol to connect the access point 1200 to an external wireless network. The IoT devices 1100, 1120, and 1140 may be connected to an external communication network through the gateway 2250. The wireless network 1300 may include the Internet and/or a public network. The plurality of IoT devices 1100, 1120, 1140, and 1160 may be connected to the server 1400 providing a predetermined service through the wireless network 1300, and the plurality of IoT devices 1100, 1120, 1140, and 1160 ) through at least one of which the user can use the service.

According to embodiments of the present disclosure, the plurality of IoT devices 1100, 1120, 1140, and 1160 may transmit and receive performance information in a mutual wider bandwidth, and demodulate and transmit/receive signals based on the performance information there is. Through this, the IoT devices 1100, 1120, 1140, and 1160 can perform efficient and effective communication to provide quality services to users.

As above, exemplary embodiments have been disclosed in the drawings and specifications. Although the embodiments have been described using specific terms in this specification, they are only used for the purpose of explaining the technical idea of the present disclosure, and are not used to limit the scope of the present disclosure described in the claims. . Therefore, those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. Therefore, the true technical scope of protection of the present disclosure should be determined by the technical spirit of the appended claims.

Claims (20)

In a station (STA) communicating with an access point (AP) in a wireless local area network (WLAN) system,
a transceiver configured to support transmission and reception up to a first bandwidth and to receive a first physical layer protocol data unit (PPDU) corresponding to a second bandwidth wider than the first bandwidth; and
A processing circuit configured to support a wider bandwidth by performing an operation of acquiring a second PPDU allocated to the STA within the first bandwidth from the first PPDU,
The processing circuit,
STA characterized in that it is configured to control the transceiver to transmit first performance information indicating first MCSs supportable in the wider bandwidth to the AP according to the performance of the STA among a plurality of MCSs. According to claim 1,
The second PPDU,
An STA, characterized in that a first MCS conforming to the first capability information is applied among the first MCSs. According to claim 1,
The plurality of MCSs,
An STA characterized by including MCSs defined from index 0 to index 15 in the standard specification of IEEE P802.11be. According to claim 1,
The performance of the STA,
The STA, characterized in that it comprises the sharpness (sharpness) of the decimation filter that the processing circuit uses to perform the operation. According to claim 1,
The processing circuit,
The STA, characterized in that configured to control the transceiver to transmit second capability information of the STA indicating whether the wider bandwidth can be supported to the AP. According to claim 1,
The first performance information,
STA characterized by including bits indicating whether support is available for each of the plurality of MCSs. According to claim 1,
The first performance information,
The STA characterized in that it includes bits indicating whether support is available for each of the specific MCSs having a data rate higher than a reference value among the plurality of MCSs. According to claim 1,
The first performance information,
STA characterized in that it includes bits indicating a specific MCS having the highest data rate among the first MCSs. According to claim 1,
The plurality of MCSs,
Including second MCSs supportable by the STA when the transceiver receives a third PPDU corresponding to a bandwidth equal to or less than the first bandwidth;
The first performance information,
and at least one bit indicating an offset from a specific MCS having the highest data rate among the second MCSs. According to claim 1,
The plurality of MCSs,
Including second MCSs supportable by the STA when the transceiver receives a third PPDU corresponding to a bandwidth equal to or less than the first bandwidth;
The second MCSs,
It is divided into a plurality of MCS groups in which MCSs having the same maximum number of spatial streams are grouped together,
The first performance information,
and at least one bit indicating an offset from a specific MCS having at least one highest data rate among the plurality of MCS groups. According to claim 1,
The first performance information,
STA characterized in that it includes information indicating the first MCSs corresponding to each of the values that the second bandwidth can have. According to claim 1,
The first performance information,
STA characterized in that it includes information indicating a cancellation level additionally supportable by the STA in relation to adjacent channel cancellation levels associated with the plurality of MCSs. According to claim 1,
The second PPDU,
The STA, characterized in that the transceiver receives the RUs through the remaining RUs excluding RUs located at the boundary of the band among a plurality of resource units (RUs) included in the band supported by the STA. According to claim 1,
The first performance information,
An STA characterized in that it is included in the 'EHT PHY Capabilites Information' field of the 'EHT Capabilities element format' defined in IEEE P802.11be. According to claim 14,
The first performance information,
STA characterized in that it is associated with the "Supported EHT-MCS And NSS Set' field defined in the IEEE P802.11be. In an AP communicating with an STA supporting transmission and reception of up to a first bandwidth in a WLAN system,
a transceiver configured to receive performance information indicating first MCSs supportable in a wider bandwidth according to the performance of the STA among a plurality of MCSs from the STA, and transmit a first PPDU to the STA; and
A processing circuit configured to select one of the first MCSs based on the performance information and a channel state with the STA and generate a second PPDU based on the selected first MCS;
The first PPDU,
An AP comprising the second PPDU and conforming to a second bandwidth wider than the first bandwidth. According to claim 16,
The performance information,
Includes bits indicating a first specific MCS having the highest data rate among the first MCSs;
The processing circuit,
The AP, characterized in that configured to identify, as the first MCSs, MCSs having a data rate less than or equal to the data rate of the first specific MCS among the plurality of MCSs based on the bits. In the operating method of an STA communicating with an AP in a WLAN system,
Transmitting performance information indicating first MCSs supportable in a wider bandwidth according to the performance of the STA among a plurality of MCSs to the AP;
Receiving a first PPDU conforming to a second bandwidth wider than the first bandwidth maximally supported by the STA and to which an MCS conforming to the performance information among the first MCSs is applied; and
And performing an operation of acquiring a second PPDU allocated to the STA within the first bandwidth from the first PPDU to support the wider bandwidth. According to claim 18,
The step of performing the operation of acquiring the second PPDU,
Performing a sampling operation, a filtering operation, and a downsampling operation on the first PPDU using at least one sampling rate determined according to a ratio between the first bandwidth and the second bandwidth and at least one decimation filter. A method of operating an STA, characterized in that for doing. According to claim 19,
The performance information,
The method of operation of an STA, characterized in that it includes bits indicating whether or not support is possible for each of the MCSs having a data rate higher than a reference value among the plurality of MCSs.

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