Apparatus and method for coordinated spatial reuse in wireless communication

Abstract

A method of wireless communication performed by a first apparatus, comprising: obtaining a transmit opportunity (TXOP) for transmitting or receiving a first physical layer protocol data unit (PPDU), identifying a second apparatus for sharing the TXOP, allowing at least one of transmission and reception of a second PPDU to the second apparatus in the shared TXOP, and transmitting the first PPDU to at least one third apparatus or receiving the first PPDU from the at least one third apparatus in the shared TXOP.

Description

[0001] Cross-references to related applications

[0002] This application is based on and claims priority to U.S. Provisional Patent Application No. 63 / 041,284, filed June 19, 2020, and Korean Patent Application No. 10-2021-0022026, filed February 18, 2021, the disclosures of which are incorporated herein by reference in their entirety. Technical Field

[0003] The exemplary embodiments of the present invention relate to wireless communication, and more specifically, to an apparatus and method for coordinating spatial reuse in wireless communication. Background Technology

[0004] As an example of wireless communication, a Wireless Local Area Network (WLAN) is a technology that uses wireless signal transmission methods to connect two or more devices to each other. WLAN technology can be based on the Institute of Electrical and Electronics Engineers (IEEE) 802.11 standard. The 802.11 standard has evolved into 802.11b, 802.11a, 802.11g, 802.11n, 802.11ac, and 802.11ax, and can support transmission speeds of up to 1 gigabits per second based on orthogonal frequency division multiplexing (OFDM) technology.

[0005] In 802.11ac, data can be transmitted simultaneously to multiple users using Multi-User Multiple-Input Multiple-Output (MU-MIMO) technology. In 802.11ax, also known as High Efficiency (HE), MU-MIMO and Orthogonal Frequency Division Multiple Access (OFDMA) technologies are used to divide and provide usable subcarriers to users, thereby implementing multiple access. Therefore, WLAN systems using 802.11ax can effectively support communication in densely populated areas and outdoors.

[0006] 802.11be, also known as Ultra High Throughput (EHT), is designed to implement support for the 6 GHz unlicensed band, utilization of up to 320 MHz of bandwidth per channel, the introduction of Hybrid Automatic Repeat Request (HARQ), and support for up to 16x16 MIMO. It is expected that next-generation WLAN systems will effectively support low latency and ultra-high-speed transmission, such as New Radio (NR) as a 5G technology. Summary of the Invention

[0007] Embodiments of the present invention provide an apparatus and method for effectively performing spatial reuse in wireless communication.

[0008] According to an embodiment of the present invention, a wireless communication method performed by a first device may include obtaining a transmission opportunity (TXOP) for transmitting or receiving a first physical layer protocol data unit (PPDU), identifying a second device for sharing the TXOP, allowing at least one of transmitting and receiving a second PPDU from the shared TXOP to the second device, and transmitting or receiving a first PPDU to or from at least one third device during the shared TXOP.

[0009] According to an embodiment of the present invention, a first device for wireless communication may include a transceiver and processing circuitry. The processing circuitry is configured to obtain a TXOP (Transmit-to-Operate) of a first PPDU (Power Component Distributed Duty Unit) transmitted or received via the transceiver, identify a second device for sharing the TXOP, allow at least one of transmission and reception of a second PPDU in the shared TXOP to and from the second device via the transceiver, and transmit or receive a first PPDU in the shared TXOP to or from at least one third device via the transceiver.

[0010] According to an embodiment of the present invention, a wireless communication method performed by a first device may include obtaining a transmission opportunity (TXOP) for transmitting or receiving a first physical layer protocol data unit (PPDU), identifying a second device for sharing the TXOP, providing the second device with tolerable interference limits for transmitting or receiving the first PPDU in the shared TXOP, and transmitting the first PPDU to or receiving the first PPDU from at least one third device in the shared TXOP.

[0011] According to an embodiment of the present invention, a wireless communication method performed by a third device associated with the second device in a TXOP shared by a first device and a second device may include receiving a frame from the first device, determining a path loss between the first device and the third device based on the frame, sending information about the path loss to the second device, and receiving or sending a Physical Layer Protocol Data Unit (PPDU) to the second device in the shared TXOP. Attached Figure Description

[0012] The above and other features of the inventive concept will become more apparent from the detailed description of exemplary embodiments of the inventive concept with reference to the accompanying drawings, in which:

[0013] Figure 1 This is a diagram illustrating an exemplary embodiment of a wireless communication system according to a concept of the present invention;

[0014] Figure 2 This is a block diagram illustrating an exemplary embodiment of a wireless communication system according to a concept of the present invention;

[0015] Figures 3A to 3DThis is a diagram illustrating a scenario of coordinated space reuse according to an exemplary embodiment of the concept of the present invention;

[0016] Figure 4 This is a message diagram illustrating an example embodiment of a method for coordinating space reuse according to a concept of the present invention;

[0017] Figure 5 This is a diagram illustrating an example of information provided by a shared access point to a shared access point according to an exemplary embodiment of the concept of the present invention;

[0018] Figure 6 This is a message diagram illustrating an example embodiment of a method for coordinating space reuse according to a concept of the present invention;

[0019] Figure 7 This is a diagram illustrating an exemplary embodiment of a wireless communication system according to a concept of the present invention;

[0020] Figure 8A and Figure 8B This is a diagram illustrating an example of a wireless communication system according to an exemplary embodiment of the concept of the present invention;

[0021] Figure 9 This is a message diagram illustrating an example embodiment of a method for coordinating space reuse according to a concept of the present invention;

[0022] Figure 10 This is a message diagram illustrating an example embodiment of a method for coordinating space reuse according to a concept of the present invention;

[0023] Figure 11 This is a message diagram illustrating an example embodiment of a method for coordinating space reuse according to a concept of the present invention;

[0024] Figure 12 This is a diagram illustrating an example embodiment of the concept according to the present invention;

[0025] Figure 13 This is a timing diagram illustrating a transmission based on coordinated spatial reuse according to an exemplary embodiment of the present invention;

[0026] Figure 14 This is a timing diagram illustrating a transmission based on coordinated spatial reuse according to an exemplary embodiment of the present invention;

[0027] Figure 15A and Figure 15B This is a timing diagram illustrating a transmission based on coordinated spatial reuse according to an exemplary embodiment of the present invention;

[0028] Figure 16 This is a diagram illustrating an exemplary embodiment of a wireless communication system according to the present invention; and

[0029] Figure 17 This is a diagram illustrating an example of a device for wireless communication according to an exemplary embodiment of a concept based on the present invention. Detailed Implementation

[0030] Example embodiments of the inventive concept will be described more fully below with reference to the accompanying drawings. Throughout the drawings, the same reference numerals may refer to the same elements.

[0031] In this document, when two or more elements or values ​​are described as substantially the same or approximately equal to each other, it should be understood that the elements or values ​​are the same, the elements or values ​​are equal to each other within measurement error, or, if measurably unequal, are sufficiently close in value to be functionally equal to each other, as understood by those skilled in the art. For example, the term "approximately" as used herein includes the stated value and, taking into account the measurement in discussion and the error associated with the measurement of a particular quantity (e.g., limitations of the measurement system), means within an acceptable deviation range for a particular value as determined by those skilled in the art. For example, "approximately" could mean within one or more standard deviations as understood by those skilled in the art. Furthermore, it should be understood that while a parameter may be described herein as having "approximately" a certain value, according to exemplary embodiments, the parameter may be precisely a certain value or approximately a certain value within measurement error, as understood by those skilled in the art.

[0032] As used herein, the term "and / or" includes any and all combinations of one or more associated listed items. Expressions such as "at least one," when preceding a list of elements, modify the entire list of elements, not the individual elements of the list.

[0033] Figure 1 This is a diagram illustrating a wireless communication system 10 according to an exemplary embodiment of the concept of the present invention. In some embodiments, the wireless communication system may be a wireless local area network (WLAN) system.

[0034] In the following detailed description of embodiments of the inventive concept, wireless communication systems implementing Orthogonal Frequency Division Multiplexing (OFDM) or OFDMA-based systems, particularly the IEEE 802.11 standard, will be described. However, embodiments of the inventive concept are not limited thereto and can be applied to other communication systems, such as, for example, cellular communication systems (e.g., LTE, LTE-A, New Radio (NR), and WiBro), Global System for Mobile Communications (GSM), or short-range communication systems (e.g., Bluetooth and Near Field Communication (NFC)), which have similar technical backgrounds and channel types, with minor modifications that do not significantly depart from the scope of embodiments of the inventive concept.

[0035] Furthermore, the various functions described below can be implemented or supported by one or more computer programs, each configured by computer-readable program code and executed on a computer-readable medium. The terms "application" and "program" refer to one or more computer programs, software components, instruction sets, procedures, functions, objects, classes, instances, associated data, or portions thereof suitable for implementing appropriate 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 all types of media accessible by a computer, such as, for example, read-only memory (ROM), random access memory (RAM), hard disk drives, optical discs (CDs), digital video discs (DVDs), or some other types of storage. "Non-transitory" computer-readable media does not include wired, wireless, optical, or other communication links that transmit transient electrical or other signals. Non-transitory computer-readable media includes media on which data can be permanently stored, and media on which data can be stored and subsequently rewritten, such as rewritable optical discs or erasable storage devices.

[0036] Wireless communication system 10 can extend its service area through an access point. A station (STA) can communicate with the access point within the basic set of services (BSS) provided by the access point and can access networks, such as the Internet or Internet Protocol (IP) networks, through the access point. For example, as... Figure 1 As shown, the first access point AP1 can provide the first BSS (Background Standard) BSS1, and the first station STA1, the third station STA3, the fourth station STA4, and the fifth station STA5 can communicate with the first access point AP1. Furthermore, the second access point AP2 can provide the second BSS (Background Standard) BSS2, and the first station STA1, the second station STA2, the third station STA3, and the sixth station STA6 can communicate with the second access point AP2. (The rest of the text is missing.) Figure 1 As shown, the first station STA1 and the third station STA3 can connect to both the first access point AP1 and the second access point AP2. Figure 1 In the diagram, the dashed lines indicate the approximate range of each of the first BSS (BSS1) and the second BSS (BSS2), and may have different ranges. Figure 1 The shape shown is circular.

[0037] Access points and stations can communicate with each other using Wi-Fi or any other WLAN communication technology. Access points may be referred to as, for example, routers, gateways, etc., and stations may be referred to as, for example, mobile stations, user stations, terminals, mobile terminals, wireless terminals, user equipment, users, etc. Stations can be portable devices, such as mobile phones, laptops, or wearable devices, or fixed devices, such as desktop computers or smart TVs. See below for reference. Figure 17Examples of access points and stations are described in further detail.

[0038] Media Access Control (MAC) protocols based on 802.11 can treat the simultaneous execution of two or more signal transmissions as a conflict, thus access points and stations can compete for channel usage. For example, access points and stations can communicate with each other based on Carrier Sense Multiple Access (CSMA) and / or Collision Avoidance (CA), so when a first access point AP1 performs a transmission to a first station STA1, a second access point AP2 can delay a transmission to a third station STA3. In an Overlapping Basic Service Set (OBSS) environment with multiple access points and multiple stations, conflicts may occur frequently, thus potentially limiting the performance (e.g., throughput) of the wireless communication system 10.

[0039] Spatial reuse (SR) allows conflicting transmissions to occur simultaneously. For example, when a first access point AP1 performs a first transmission to a first station STA1, a second access point AP2 can perform a second transmission to a second station STA2 at a transmission power level that does not interfere with the reception of the first station STA1, instead of delaying the transmission to the second station STA2. Therefore, the first transmission to the first station STA1 and the second transmission to the second station STA2 can be performed in parallel, and the transmission volume in the wireless communication system 10 can be increased. In this document, the transmission associated with an access point that has obtained a transmission opportunity (TXOP) can be referred to as the first transmission, and the transmission associated with an access point that has been provided with a shared TXOP can be referred to as the second transmission.

[0040] In 802.11, an access point or station can identify a first transmission based on a preamble, and if the first transmission is identified, a second transmission can be performed with a transmission power determined based on the received power of the preamble, wherein the second transmission at least partially overlaps with the first transmission. However, the second transmission may not be considered in the first transmission, thus potentially limiting the efficiency of spatial reuse. As described below with reference to the accompanying drawings, in spatial reuse, the first transmission can consider the second transmission in addition to the second transmission considering the first transmission, thus enabling more efficient spatial reuse.

[0041] In this document, the spatial reuse of the first transmission considering the second transmission can be referred to as Coordinated Spatial Reuse (C-SR). Furthermore, the access point associated with the first transmission (i.e., acquiring TXOP) can be referred to as a shared access point, and the BSS provided by the shared access point can be referred to as a shared BSS. The access point associated with the second transmission can be referred to as a shared access point, and the BSS provided by the shared access point can be referred to as a shared BSS. Unless otherwise stated, it is assumed that the first access point AP1 is a shared access point and the second access point AP2 is a shared access point. The first access point AP1 and the second access point AP2 can be referred to as a first device and a second device, respectively, and each of the stations can be referred to as a third device or a fourth device. A Physical Layer Protocol Data Unit (PPDU) transmitted between the first access point AP1 and at least one station included in the first BBS BBS1 provided by the first access point AP1 can be referred to as a first PPDU. A PPDU transmitted between the second access point AP2 and at least one station included in the second BBS BBS2 provided by the second access point AP2 can be referred to as a second PPDU.

[0042] Figure 2 This is a block diagram illustrating an example embodiment of a wireless communication system 20 according to a concept of the present invention. For example, Figure 2 The block diagram shows a first wireless communication device 21 and a second wireless communication device 22 communicating with each other in a wireless communication system 20. Figure 2 Each of the first wireless communication device 21 and the second wireless communication device 22 can be any device that communicates in the wireless communication system 20, and can be referred to as a device for wireless communication. In some embodiments, each of the first wireless communication device 21 and the second wireless communication device 22 can be an access point or station of a WLAN system.

[0043] refer to Figure 2 The first wireless communication device 21 may include an antenna 21_2, a transceiver 21_4, and a processing circuit 21_6. In some embodiments, the antenna 21_2, transceiver 21_4, and processing circuit 21_6 may be included in a single package, or may be included in separate packages. The second wireless communication device 22 may also include an antenna 22_2, a transceiver 22_4, and processing circuit 22_6. For ease of explanation, redundant descriptions of the first wireless communication device 21 and the second wireless communication device 22 will be omitted below.

[0044] Antenna 21_2 can receive signals from the second wireless communication device 22 and provide those signals to transceiver 21_4, and can also transmit signals provided from transceiver 21_4 to the second wireless communication device 22. In some embodiments, antenna 21_2 may include multiple antennas for multiple-input multiple-output (MIMO). Furthermore, in some embodiments, antenna 21_2 may include a phased array for beamforming.

[0045] Transceiver 21_4 can process signals received from the second wireless communication device 22 via antenna 21_2 and can provide the processed signals to processing circuitry 21_6. Furthermore, transceiver 21_4 can process signals provided from processing circuitry 21_6 and can output the processed signals via antenna 21_2. In some embodiments, transceiver 21_4 may include analog circuitry, such as, for example, a low-noise amplifier, mixer, filter, power amplifier, or oscillator. In some embodiments, transceiver 21_4 can process signals received from antenna 21_2 and / or signals received from processing circuitry 21_6 based on the control of processing circuitry 21_6.

[0046] Processing circuitry 21_6 can extract information transmitted by the second wireless communication device 22 by processing signals received from transceiver 21_4. For example, processing circuitry 21_6 can extract information by demodulating and / or decoding signals received from transceiver 21_4. Furthermore, a signal including information to be transmitted to the second wireless communication device 22 can be generated and provided to transceiver 21_4. For example, processing circuitry 21_6 can provide transceiver 21_4 with a signal generated by encoding and / or modulating data to be transmitted to the second wireless communication device 22. In some embodiments, processing circuitry 21_6 may include programmable components (such as, for example, a central processing unit (CPU) or digital signal processor (DSP)), reconfigurable components (such as, for example, a field-programmable gate array (FPGA)), or components providing fixed functions (such as, for example, an intellectual property (IP) core). In some embodiments, processing circuitry 21_6 may include a memory for storing data and / or a series of instructions, or an access memory. Hereinafter, operations performed by transceiver 21_4 and / or processing circuitry 21_6 may be referred to as operations performed by the first wireless communication device 21. Therefore, operations performed by the access point can be performed by transceivers and / or processing circuitry included in the access point, and operations performed by the station can be performed by transceivers and / or processing circuitry included in the station.

[0047] Figures 3A to 3D This is a diagram illustrating a scenario of coordinated space reuse according to an exemplary embodiment of the concept of the present invention. For example, Figures 3A to 3DWireless communication systems 30a, 30b, 30c, and 30d, each comprising a first access point AP1, a second access point AP2, a first station STA1, a second station STA2, and a third station STA3, are illustrated. In the following text, the transmission of a data-included PPDU from an access point to a station may be referred to as a downlink (DL) transmission, and the transmission of a data-included PPDU from a station to an access point may be referred to as an uplink (UL) transmission. In the description... Figures 3A to 3D For ease of explanation, further descriptions of the previously described components and technical aspects may be omitted.

[0048] refer to Figure 3A This can lead to a first downlink transmission DL1 in the first BSS BSS1 and a second downlink transmission DL2 in the second BSS BSS2. For example, the first access point AP1 can obtain a TXOP to send a first PPDU to the first station STA1. The first access point AP1 can send the first PPDU to the first station STA1 in a shared TXOP, and the second access point AP2 can send a second PPDU to the second station STA2 in a shared TXOP. Figure 3A As shown by the dashed arrow, the second downlink transmission DL2 can act as the first station STA1 to handle the interference of the first downlink transmission DL1. With the increase in the transmission power of the second downlink transmission DL2, the signal-to-interference ratio (SIR) at the first station STA1 may decrease. Therefore, considering an appropriate SIR at the first station STA1, the second access point AP2 can perform the second downlink transmission DL2. In this paper, Figure 3A Examples of this can be referred to as DL / DL scenarios or DL / DL situations involving coordinated space reuse.

[0049] In some embodiments, unlike Figure 3A In the illustrated embodiment, the first access point AP1 can provide downlink transmission to multiple users (MUs) (i.e., multiple stations). Furthermore, in some embodiments, the second access point AP2 can also provide downlink transmission to multiple stations. Note in this document that coordinated spatial reuse DL / DL scenarios or DL / DL situations can cover the aforementioned multi-user downlink transmission and... Figure 3A The diagram shows a single-user (SU) downlink transmission.

[0050] refer to Figure 3BThis can lead to a first uplink transmission UL1 in the first BSS BSS1 and a second downlink transmission DL2 in the second BSS BSS2. For example, the first access point AP1 can obtain a TXOP to receive a first PPDU from the first station STA1. The first station STA1 can send the first PPDU to the first access point AP1 in a shared TXOP, and the second access point AP2 can send a second PPDU to the second station STA2 in a shared TXOP. Figure 3B As shown by the dashed arrow, the second downlink transmission DL2 can act as the first access point AP1 to handle interference from the first uplink transmission UL1. With the increase in the transmission power of the second downlink transmission DL2, the signal-to-interference ratio at the first access point AP1 may decrease. Therefore, considering an appropriate signal-to-interference ratio at the first access point AP1, the second access point AP2 can perform the second downlink transmission DL2. In this paper, Figure 3B Examples of this can be referred to as UL / DL scenarios or UL / DL situations involving coordinated space reuse.

[0051] In some embodiments, with Figure 3B Unlike other access points, multiple users, i.e., multiple stations, can provide uplink transmission to the first access point AP1. Furthermore, in some embodiments, the second access point AP2 can provide downlink transmission to multiple stations. Note in this document that UL / DL scenarios or UL / DL situations involving coordinated spatial reuse can be covered. Figure 3B The diagram shows single-user uplink transmission, single-user downlink transmission, and multi-user uplink transmission and / or multi-user downlink transmission.

[0052] refer to Figure 3C This can lead to a first downlink transmission DL1 in the first BSS (BSS1) and second uplink transmissions UL21 and UL22 in the second BSS (BSS2). For example, the first access point AP1 can obtain a TXOP for sending a first PPDU. The first access point AP1 can send the first PPDU to the first station STA1 in a shared TXOP, and the second station STA2 and the third station STA3 can send the second PPDU to the second access point AP2 in a shared TXOP. Figure 3C As shown by the dashed arrows, the second uplink transmissions UL21 and UL22 can be used to handle interference from the first downlink transmission DL1. With the increase in the transmission power of the second uplink transmissions UL21 and UL22, the signal-to-interference ratio at the first station STA1 may decrease. Therefore, considering the appropriate signal-to-interference ratio at the first station STA1, the second station STA2 and the third station STA3 can implement the second uplink transmissions UL21 and UL22. In this paper, Figure 3C Examples of this can be referred to as DL / UL scenarios or DL / UL situations involving coordinated space reuse.

[0053] In some embodiments, with Figure 3C Unlike other access points, the first access point AP1 can provide downlink transmission to multiple users (MUs) (i.e., multiple stations). Furthermore, in some embodiments, a single user, i.e., a single station, can provide uplink transmission to the second access point AP2. Note in this document that coordinated spatial reuse DL / UL scenarios or DL / UL cases can be covered. Figure 3C The diagram shows single-user downlink transmission and multi-user uplink transmission, as well as multi-user downlink transmission and / or single-user uplink transmission.

[0054] refer to Figure 3D This can lead to a first uplink transmission UL1 in the first BSS BSS1 and second uplink transmissions UL21 and UL22 in the second BSS BSS2. For example, the first access point AP1 can obtain a TXOP to receive the first PPDU. The first station STA1 can send the first PPDU to the first access point AP1 in a shared TXOP, and the second station STA2 and the third station STA3 can send the second PPDU to the second access point AP2 in a shared TXOP. Figure 3D As shown by the dashed arrows, the second uplink transmissions UL21 and UL22 can be used to handle interference from the first uplink transmission UL1. With the increase in transmission power of the second uplink transmissions UL21 and UL22, the signal-to-interference ratio at the first access point AP1 may decrease. Therefore, considering an appropriate signal-to-interference ratio at the first access point AP1, the second station STA2 and the third station STA3 can implement the second uplink transmissions UL21 and UL22. In this paper, Figure 3D Examples of this can be referred to as UL / UL scenarios or UL / UL situations involving coordinated space reuse.

[0055] In some embodiments, with Figure 3D Unlike other methods, multiple users, i.e., multiple stations, can provide uplink transmission to the first access point AP1. Furthermore, in some embodiments, a single user, i.e., a single station, can provide uplink transmission to the second access point AP2. Note in this document that UL / UL scenarios or UL / UL situations involving coordinated spatial reuse can be covered. Figure 3D The diagram illustrates single-user uplink transmission and multi-user uplink transmission, as well as multi-user uplink transmission and / or single-user uplink transmission. Further descriptions corresponding to the above references will follow. Figures 3A to 3D Examples of methods for coordinating space reuse in the described scenario.

[0056] Figure 4 This is a message diagram illustrating an example embodiment of a method for coordinating space reuse according to a concept of the present invention. (e.g.) Figure 4As shown, the method for coordinating space reuse may include multiple operations (S41 to S45). (Refer to the above...) Figure 1 The above, Figure 4 The first access point AP1 can be a shared access point, and the second access point AP2 can be a shared access point. Figure 4 In this context, the first station STA1 can be associated with the first access point AP1 in the first BSS BSS1 provided by the first access point AP1, and the second station STA2 can be associated with the second access point AP2 in the second BSS BSS2 provided by the second access point AP2.

[0057] refer to Figure 4 In operation S41, the first access point AP1 can obtain a TXOP. For example, the first access point AP1 can obtain a TXOP to send a first PPDU to the first station STA1, or to receive a TXOP from the first station STA1. (See above for reference.) Figure 1 The first access point AP1 can obtain a TXOP by competing with at least one station or another access point. For space reuse, the TXOP obtained by the first access point AP1 can be shared with the second access point AP2.

[0058] In operation S42, the first access point AP1 may share the TXOP with the second access point AP2. For example, the first access point AP1 may allow at least one of the transmission and reception of the second PPDU in the shared TXOP to the second access point AP2. The first access point AP1 may allow uplink and / or downlink transmissions in the second BSS so as not to interfere with the transmission or reception of the first PPDU in the first BSS BSS1. In some embodiments, the first access point AP1 may send a signal to the second access point AP2 including information indicating permission for uplink and / or downlink transmissions (e.g., Figure 13 (AF or PPDU0 in the text). See below for reference. Figure 5 Describe examples of information indicating permitted uplink and / or downlink transmissions.

[0059] As will be referred to later Figure 8A and Figure 8BAs described, when uplink transmissions occur in the second BSS (BSS2), estimating the interference caused by the second transmission from the first access point AP1 may be more difficult than when downlink transmissions occur in the second BSS (BSS2). Therefore, the first access point AP1 may allow at least one of the uplink and downlink transmissions to the second access point AP2 so as not to interfere with the transmission or reception of the first PPDU. In some embodiments, if the path loss between the first access point AP1 and the first station STA1 is higher than a predetermined threshold, the first access point AP1 may allow only downlink transmissions to the second access point AP2. In some embodiments, coordinating space reuse may define only downlink transmissions in the shared BSS (i.e., the second BSS (BSS2)), therefore, operations S42 and S43, described later, may be omitted, and the second access point AP2 may perform only downlink transmissions, i.e., the transmission of the second PPDU in the shared TXOP.

[0060] In operation S43, the second access point AP2 can identify at least one of permitted uplink and downlink transmissions. For example, the second access point AP2 can extract information about permitted uplink and / or downlink transmissions from the signals received from the first access point AP1 in operation S42. In some embodiments, if uplink transmission is permitted, the second access point AP2 can send a trigger frame to the second station STA2 to receive the second PPDUD.

[0061] In operation S44, a first PPDU PPDU1 can be transmitted between the first access point AP1 and the first station STA1, and in operation S45, a second PPDU PPDU2 can be transmitted between the second access point AP2 and the second station STA2. For example, in operation S44, the first access point AP1 can transmit the first PPDU PPDU1 to the first station STA1 in a shared TXOP, or the first station STA1 can transmit the first PPDU PPDU1 to the first access point AP1 in a shared TXOP. Furthermore, when an uplink transmission is identified in operation S43, the second station STA2 can transmit the second PPDU PPDU2 to the second access point AP2, and when a downlink transmission is identified in operation S43, the second access point AP2 can transmit the second PPDU PPDU2 to the second station STA2.

[0062] Figure 5 This is a diagram illustrating an example of information provided by a shared access point to a shared access point according to an exemplary embodiment of the concept of the present invention. For example, Figure 5 This illustrates the provision provided by the first access point AP1 to... Figure 4The table in operation S42 allows at least one value of uplink and downlink transmissions to the second access point AP2. Refer to the following text. Figure 4 describe Figure 5 .

[0063] In some embodiments, permission for at least one of uplink and downlink transmissions can be represented as a 2-bit value. For example, as... Figure 5 As shown, the 2 most significant bits (MSB) indicate whether downlink transmission is allowed, and the 2 least significant bits (LSB) indicate whether uplink transmission is allowed. Therefore, "01" can correspond to allowing uplink transmission, "10" can correspond to allowing downlink transmission, and "11" can correspond to allowing both uplink and downlink transmission. In some embodiments, refer to the following... Figure 13 The above, Figure 5 The 2-bit value can correspond to an announcement frame sent from the first access point AP1 to the second access point AP2 (e.g., Figure 13 The fields included in AF). In some embodiments, to represent the above three combinations, fields such as Figure 5 The values ​​shown are 2-bit values ​​with different values.

[0064] Figure 6 This is a message diagram illustrating an example embodiment of a method for coordinating space reuse according to a concept of the present invention. For example, Figure 6 The message diagram illustrates the operations performed in each of the DL / DL and UL / DL scenarios for coordinating space reuse, as shown in the reference above. Figure 3A and 3B As described. Figure 6 As shown, the method for coordinating space reuse may include multiple operations (S60 to S69). In Figure 6 In this context, the first station STA1 can be included in the first BSS BSS1 provided by the first access point AP1, and the second station STA2 can be included in the second BSS BSS2 provided by the second access point AP2. Furthermore, in... Figure 6 Before executing operations S60 and S65 respectively, it is assumed that the first access point AP1 has already obtained TXOP.

[0065] refer to Figure 6In operation S60, the first access point AP1 can determine the transmit power limit (TPL) in the shared TXOP. The transmit power limit can correspond to the maximum transmit power allowed when the second access point AP2 transmits a second PPDU to the second station STA2 in the shared TXOP. For example, the first access point AP1 can obtain a TXOP for transmitting a first PPDU to the first station STA1 and can determine the transmit power limit based on at least one path loss associated with the first station STA1. (Refer to...) Figure 7 Examples of operations for determining transmit power limits in DL / DL and UL / DL scenarios for coordinated space reuse are described in further detail.

[0066] In operation S61, the first access point AP1 may provide a transmit power limit to the second access point AP2. For example, the first access point AP1 may send a signal to the second access point AP2 that includes the transmit power limit determined in operation S60. In some embodiments, reference is made to the following... Figure 13 The transmit power limit can be included in the announcement frame.

[0067] In operation S62, the second access point AP2 can identify a transmit power limit. For example, the second access point AP2 can extract the transmit power limit from the signal received from the first access point AP1 in operation S61. In some embodiments, the transmit power limit may have the same format as the transmit power field included in the transmit power control (TPC) report, and the second access point AP2 can identify the transmit power limit corresponding to the value of the transmit power limit.

[0068] In operation S63, the first access point AP1 can send a first PPDU to the first station STA1 in the shared TXOP, and in operation S64, the second access point AP2 can send a second PPDU to the second station STA2 in the shared TXOP. The second access point AP2 can send the second PPDU at a transmission power approximately equal to or less than the transmission power limit identified in operation S62, thus reducing or eliminating interference caused by the transmission of the second PPDU. The first station STA1 can successfully receive the first PPDU.

[0069] In operation S65, the first access point AP1 can determine the transmit power limit in the shared TXOP. For example, the first access point AP1 can obtain the TXOP for receiving the first PPDU from the first station STA1, and can determine the transmit power limit based on at least one path loss associated with the first access point AP1. (See later...) Figure 7 Describe an example of the operation for determining transmit power limits.

[0070] In operation S66, the first access point AP1 can provide a transmit power limit to the second access point AP2. In operation S67, the second access point AP2 can recognize the transmit power limit.

[0071] In operation S68, the first station STA1 can send a first PPDU to the first access point AP1 in the shared TXOP, and in operation S69, the second access point AP2 can send a second PPDU to the second station STA2 in the shared TXOP. The second access point AP2 can send the second PPDU at a transmission power approximately equal to or less than the transmission power limit identified in operation S62, thus reducing or eliminating interference caused by the transmission of the second PPDU. The first access point AP1 can successfully receive the first PPDU.

[0072] Figure 7 This is a diagram illustrating an example embodiment of a wireless communication system 70 according to a concept of the present invention. For example, Figure 7 The diagram illustrates an example of path loss considered in coordinated space reuse when downlink transmissions occur within a shared BBS. For example... Figure 7 As shown, we can consider the first path loss PL1 between the first access point AP1 and the first station STA1, the second path loss PL2 between the second access point AP2 and the second station STA2, and the third path loss PL3 between the first access point AP1 and the second access point AP2. Furthermore, the first access point AP1 can provide a first BSS (Background Service) BSS1, the second access point AP2 can provide a second BSS BSS2, and the first station STA1 can be included in the first BSS BSS1.

[0073] In DL / DL scenarios (e.g., in Figure 6 In operation S60, the transmit power limit can be determined based on the first path loss PL1 and the second path loss PL2. For example, the first path loss PL1 may correspond to the loss of the signal transmitted by the first access point AP1, and the second path loss PL2 may correspond to the loss of the signal transmitted by the second access point AP2. Since the first path loss PL1 is low and the second path loss PL2 is high, it may be advantageous for the first station STA1 to successfully receive the first PPDU from the first access point AP1. Therefore, the first access point AP1 can determine the transmit power limit based on the transmit power of the first access point AP1, the first path loss PL1, and the second path loss PL2. For example, when the transmit power of the first access point AP1 is P... AP1 Furthermore, the first station, STA1, successfully received the first PPDU with a minimum signal-to-interference ratio of SIR. STA1 Transmit power limit (TPL) in DL / DL scenarios AP2 The following equation 1 can be satisfied.

[0074] [Equation 1]

[0075] TPL Ap2 ≤P Ap1 -(PL1-PL2)-SIR STA1

[0076] In UL / DL scenarios (e.g., in Figure 6 In operation S65, the transmit power limit can be determined based on the first path loss PL1 and the third path loss PL3. For example, the first path loss PL1 may correspond to the loss of the signal transmitted by the first access point AP1, and the third path loss PL3 may correspond to the loss of the signal transmitted by the second access point AP2. Since the first path loss PL1 is low and the third path loss PL3 is high, it may be advantageous for the first access point AP1 to successfully receive the first PPDU from the first station STA1. Therefore, the first access point AP1 can determine the transmit power limit based on the transmission power of the first station STA1, the first path loss PL1, and the third path loss PL3. For example, in a UL / DL scenario, when the transmission power of the first station STA1 is P... AP1 Furthermore, the minimum signal-to-interference ratio (SIR) of the first access point AP1 successfully received the first PPDU is SIR. AP1 At that time, transmit power limit TPL AP2 Equation 2 can be satisfied.

[0077] [Equation 2]

[0078] TPL Ap2 ≤P STA1 -(PL1-PL3)-SIR AP1

[0079] In some embodiments, the first station STA1 can calculate a first path loss PL1 based on frames output from the first access point AP1, and a second path loss PL2 based on frames output from the second access point AP2. The first station STA1 can report the first path loss PL1 and the second path loss PL2 to the first access point AP1. Furthermore, the first access point AP1 (or the second access point AP2) can calculate a third path loss PL3 based on frames output from the second access point AP2 (or the first access point AP1). Therefore, the shared access point, i.e., the first access point AP1, can obtain information about the first path loss PL1, the second path loss PL2, and the third path loss PL3. Reference will be made later. Figure 12 Describe an example of an operation that calculates path loss based on received frames.

[0080] Figure 8A and Figure 8BThis is a diagram illustrating an example of a wireless communication system according to an exemplary embodiment of the concept of the present invention. For example, Figure 8A The diagram illustrates an example of path loss considered in a coordinated spatial reuse DL / UL scenario in a wireless communication system 80a, and Figure 8B The diagram illustrates an example of path loss considered in a UL / UL scenario for coordinated spatial reuse in a wireless communication system 80b. For example... Figure 8A and Figure 8B As shown, the first station STA1 can be included in the first BSS BSS1 provided by the first access point AP1, and the second station STA2 and the third station STA3 can be included in the second BSS BSS2 provided by the second access point AP2.

[0081] refer to Figure 8A In DL / UL scenarios, the first path loss PL between the first access point AP1 and the first station STA1 can be considered. 11a The second path loss PL between the second station STA2 and the first station STA1 12a And the third path loss PL between the third station STA3 and the first station STA1. 13a Due to the first path loss PL 11a Low and second path loss PL 12a and third path loss PL 13a Therefore, it is likely advantageous for the first access point AP1 to successfully receive the first PPDU from the first station STA1. The first station STA1 can then calculate the first path loss PL based on the frames received from the first access point AP1. 11a Since the second station STA2 and the third station STA3 do not output frames, the PL value for the second path loss is obtained. 12a and third path loss PL 13a The information may not be easy to obtain.

[0082] refer to Figure 8B In UL / UL scenarios, the first path loss PL between the first access point AP1 and the first station STA1 can be considered. 11b The second path loss PL between the first access point AP1 and the second station STA2 12b And the third path loss PL between the first access point AP1 and the third station STA3. 13b Due to the first path loss PL 11b Low and second path loss PL 12b and third path loss PL 13b Therefore, it is likely advantageous for the first access point AP1 to successfully receive the first PPDU from the first station STA1. The first access point AP1 can receive information about the first path loss PL from the first station STA1.11b Information. Additionally, as will be referred to later. Figure 11 As described, the second access point AP2 can receive information about the second path loss PL from the second station STA2 and the third station STA3. 12b and third path loss PL 13b Information.

[0083] Figure 9 This is a message diagram illustrating an example embodiment of a method for coordinating space reuse according to a concept of the present invention. For example, Figure 9 The message image is shown in the reference above. Figure 3C and Figure 8A The operations performed in a DL / UL scenario describing the coordination of space reuse. For example... Figure 9 As shown, the method for coordinating space reuse may include multiple operations (S91 to S96). In Figure 9 In this context, the first station STA1 can be included in the first BSS BSS1 provided by the first access point AP1, and the second station STA2 can be included in the second BSS BSS2 provided by the second access point AP2.

[0084] As per the above reference Figure 8A As mentioned above, some path losses in DL / UL scenarios where coordinated space reuse can be difficult to achieve. Therefore, in order to reduce or minimize interference with transmissions to the shared BSS (i.e., the first BSS BSS1), the shared access point (i.e., the second access point AP2) can conservatively determine its own transmit power limit and limit the transmission power of uplink transmissions based on the determined transmit power limit. As described below, in some embodiments, the shared access point can determine the transmit power limit based on the received power measured from transmissions occurring in the shared BSS.

[0085] refer to Figure 9 In operation S91, the first station STA1 can send a PPDU to the first access point AP1, and in operation S92, the second access point AP2 can receive a PPDU from the first station STA1. That is, the signal output by the first station STA1 to send a PPDU can reach both the first access point AP1 and the second access point AP2. Therefore, the second access point AP2 can receive a PPDU from the first station STA1.

[0086] In operation S93, the second access point AP2 can measure the received power of the PPDU. For example, the second access point AP2 can measure the received power based on the preamble of the PPDU received in operation S92. When the measured received power is high, the second access point AP2 can estimate the low path loss between the second access point AP2 and the first station STA1, while when the measured received power is low, the second access point AP2 can estimate the high path loss between the second access point AP2 and the first station STA1. Therefore, in some embodiments, when the measured received power exceeds a threshold, the second access point AP2 can abandon uplink transmission in the shared TXOP.

[0087] In operation S94, the second access point AP2 can limit the transmission power of the second station STA2. For example, before executing operation S94, the TXOP can be shared by the first access point AP1, and if the received power measured in operation S93 is less than a threshold, the second access point AP2 can determine the transmission power limit based on the measured received power, the minimum signal-to-interference ratio for successfully receiving the second PPDU, and the path loss between the second access point AP2 and the second station STA2. The second access point AP2 can limit the transmission power of the second station STA2 by sending a signal to the second station STA2 that includes the determined transmission power limit.

[0088] In operation S95, the first station STA1 can send a first PPDU to the first access point AP1 in the shared TXOP, and in operation S96, the second station STA2 can send a second PPDU to the second access point AP2 in the shared TXOP. In operation S94, the second station STA2 can send the second PPDU with a transmission power approximately equal to or less than the transmission power limit provided by the second access point AP2, and the first access point AP1 can successfully receive the first PPDU.

[0089] Figure 10 This is a message diagram illustrating an example embodiment of a method for coordinating space reuse according to a concept of the present invention. For example, Figure 10 The message image is shown in the reference above. Figure 3D and 8B The operations performed in a UL / UL scenario involving coordinated space reuse are described. For example... Figure 10 As shown, the method for coordinating space reuse may include multiple operations (S91 to S96). In Figure 10 In this context, the first station STA1 can be included in the first BSS BSS1 provided by the first access point AP1, and the second station STA2 can be included in the second BSS BSS2 provided by the second access point AP2. Reference will be made to the following description. Figure 8B describe Figure 10 .

[0090] In operation S101, the first access point AP1 can determine a tolerable interference limit (TIL). The tolerable interference limit can correspond to the maximum interference allowed for the first access point AP1 to successfully receive the first PPDU. For example, the first access point AP1 can obtain the TXOP of the first PPDU received from the first station STA1 and determine the tolerable interference limit based on at least one path loss associated with the first access point AP1. In some embodiments, the first access point AP1 can determine the tolerable interference limit based on the transmission power of the first station STA1, Figure 8B First path loss PL 11b The minimum signal-to-interference ratio required to successfully receive the first PPDU is used to determine the tolerable interference limit. For example, Figure 8B The signal interference ratio of the first access point AP1 is SIR. UL / UL It can be calculated as shown in Equation 3 below.

[0091] [Equation 3]

[0092] SIR UL / UL =(P STA1 -PL 11b )-(P STA2 -PL 12b )-(P STA3 -PL 13b )

[0093] In equation 3, P STA1 P STA2 and P STA3 These represent the transmission power of the first station STA1, the second station STA2, and the third station STA3, respectively. On the right-hand side of Equation 3, the first term corresponds to the received power of the signal received by the first access point AP1 from the first station STA1, the second term corresponds to the received power of the signal received by the first access point AP1 from the second station STA2, and the third term corresponds to the received power of the signal received by the first access point AP1 from the third station STA3. Therefore, the second and third terms on the right-hand side of Equation 3 correspond to the interference acting on the reception of the first PPDU. The minimum signal-to-interference ratio (SIR) when the first access point AP1 successfully receives the first PPDU is... AP1 When, SIR in Equation 3 UL / UL It can be greater than or approximately equal to SIR. AP1 Therefore, SIR is satisfied. AP1 Tolerable interference limits The following equation 4 (SIR) can be satisfied. UL / UL =SIR AP1 ).

[0094] [Equation 4]

[0095]

[0096] In operation S102, the first access point AP1 may provide a tolerable interference limit to the second access point AP2. For example, the first access point AP1 may send a signal to the second access point AP2 that includes the tolerable interference limit determined in operation S101. In some embodiments, reference is made to the following... Figure 13 The tolerance limit can be included in the notification frame.

[0097] In operation S103, the second access point AP2 can identify tolerable interference limits. For example, the second access point AP2 can extract tolerable interference limits from the signal received from the first access point AP1 in operation S102.

[0098] In operation S104, the second access point AP2 can limit the transmission power of the second station STA2. In some embodiments, the second access point AP2 can determine the transmission power of the second station STA2 based on the tolerable interference limit identified in operation S103 and at least one path loss associated with the first access point AP1. For example, uplink transmission transmission power limit. The tolerance interference limit based on Equation 4 can be satisfied. Equation 5.

[0099] [Equation 5]

[0100]

[0101] The second access point AP2 can be based on Equation 5 in a multi-user (MU) environment (e.g., Figure 8B STA2 and STA3) distribute transmission power, and as Figure 10 As shown, in a single-user environment, the transmit power limit in Equation 5... It can be provided to the second station, STA2.

[0102] In operation S105, the first station STA1 can send a first PPDU to the first access point AP1 in the shared TXOP, and in operation S106, the second station STA2 can send a second PPDU to the second access point AP2 in the shared TXOP. The second station STA2 can send the second PPDU at a transmission power approximately equal to or less than the transmission power limit provided by the second access point AP2 in operation S104, and the first access point AP1 can successfully receive the first PPDU.

[0103] Figure 11 This is a message diagram illustrating an example embodiment of a method for coordinating space reuse according to a concept of the present invention. Figure 12 This is a diagram illustrating an example embodiment of the concept according to the present invention. For example, Figure 11 The message diagram illustrates a method for obtaining path loss used in UL / UL scenarios with space reuse in coordination, and Figure 12 Frame 120 can be used Figure 11 In the method. In Figure 11 In this context, the second station STA2 can be included in the second BSS BSS2 provided by the second access point AP2. Reference will be made to the following description. Figure 8B describe Figure 11 and Figure 12 .

[0104] refer to Figure 11 The method for coordinating space reuse may include multiple operations S111 to S113. In operation S111, a first access point AP1 may transmit frame 120, and a second access point AP2 and a second station STA2 may respectively receive frame 120. For example, each of the access points including the first access point AP1 and the second access point AP2 may periodically or aperiodically output frame 120, and other access points or stations may receive frame 120.

[0105] refer to Figure 12 Frame 120 may include multiple fields, and each of the multiple fields may include information. For example, such as Figure 12 As shown, frame 120 may include a first field 121 and a second field 122, wherein the first field 121 includes information about coordinated spatial reuse capability, and the second field 122 includes information about the transmission power of frame 120. For example, second access point AP2 and second station STA2 can extract the first field 121 from frame 120 received from first access point AP1 and identify whether first access point AP1 supports coordinated spatial reuse based on the value of the first field 121. Furthermore, second access point AP2 and second station STA2 can extract the second field 122 from frame 120 and identify the transmission power used by first access point AP1 for the transmission power included in frame 120 based on the value of the second field 122. In some embodiments, the second field 122 may have the same format as the transmit power field included in the TPC report. Figure 12 Frame 120 can be any frame including the first field 121 and the second field 122, such as a beacon frame or a trigger frame.

[0106] Reference Figure 11 In operation S112, the second station STA2 can determine the path loss between the first access point AP1 and the second station STA2 (i.e., Figure 8B PL 12bFor example, the second station STA2 can measure the received power of frame S111 and calculate the path loss as the difference between the measured received power and the transmitted power information included in frame 120. Similarly, the path loss described above with reference to the accompanying drawings can be calculated based on that frame at the access point and / or station.

[0107] In operation S113, the second station STA2 can report path loss. For example, the second station STA2 can send a signal to the second access point AP2 including information about the path loss determined in operation S112. The second station STA2 can report path loss, including the first access point AP1 providing the first BSS BSS1 and the second access point AP2 providing the second BSS BSS2. Therefore, as referenced above... Figure 10 The second access point AP2 can determine the transmission power limit of the second station STA2 in a UL / UL scenario of coordinated spatial reuse.

[0108] Figure 13 This is a timing diagram illustrating a transmission based on coordinated spatial reuse according to an example embodiment of the concept of the present invention. For example, Figure 13 The timing diagram illustrates examples of transmission and announcement frames (AFs) occurring in a DL / DL scenario for coordinated spatial reuse. Figure 13 In this context, the first station STA1 can be included in the first BSS BSS1 provided by the first access point AP1, and the second station STA2 can be included in the second BSS BSS2 provided by the second access point AP2.

[0109] refer to Figure 13 At time t11, the first access point AP1 can send a PPDU (PPDU0) including an advertisement frame AF to the second access point AP2 to share the TXOP. The advertisement frame AF can include information required to share the TXOP. Figure 13 As shown in the upper part, the notification frame (AF) can include multiple fields, and each of these fields can include information. For example, as Figure 13 As shown, the notification frame AF may include the first field 131 to the sixth field 136.

[0110] The first field 131 may include identification information of the shared access point (i.e., the second access point AP2). The second field 132 may include information about the bandwidth of the shared TXOP. The third field 133 may include information about the time period during which PPDU transmissions are performed in the shared TXOP. (Refer to the above.) Figure 4 The fourth field 134 may include information indicating the type of transmission allowed to the shared access point (e.g., Figure 5 (MSB and LSB). The fifth field 135 may include the above reference. Figure 6The aforementioned transmit power limit (TPL). The sixth field 136 may include the above reference. Figure 10 The tolerance interference limit is described above. In some embodiments, it may be omitted from the notification frame AF. Figure 13 At least one of the first field 131 to the sixth field 136 shown. The shared access point can control or execute the transmission of the shared BSS based on the information included in the announcement frame AF.

[0111] In some embodiments, the notification frame (AF) may include multiple fields from multiple shared access points. For example, as will be referred to later. Figure 16 As described, a first access point AP1 can share a TXOP with multiple shared access points, including a second access point AP2, and send an announcement frame AF including information to be provided to the multiple shared access points. Therefore, the announcement frame AF may include multiple fields corresponding to the multiple shared access points. For example, the announcement frame AF may include multiple first fields, multiple second fields, multiple third fields, multiple fourth fields, multiple fifth fields, and multiple sixth fields corresponding to the multiple shared access points. Furthermore, in some embodiments, the announcement frame AF may include fields indicating information common to the multiple shared access points. For example, the announcement frame AF may include a second field 132 and a third field 133 common to the multiple shared access points. The fields included in the announcement frame AF may be combined differently for the multiple shared access points, and the configuration of the announcement frame AF is not limited to the foregoing.

[0112] At time t12, the first access point AP1 can send the first PPDU (PPDU1) to the first station STA1 in the shared TXOP, and the second access point AP2 can send the second PPDU (PPDU2) to the second station STA2 in the shared TXOP. (See above for reference.) Figure 6 The second access point AP2 can transmit the second PPDU PPDU2 with limited transmission power. Therefore, the first station STA1 and the second station STA2 can successfully receive the first PPDU PPDU1 and the second PPDU PPDU2 in the shared TXOP, respectively, and at time t13, the first acknowledgment response BA1 and the second acknowledgment response BA2 can be sent to the first access point AP1 and the second access point AP2, respectively.

[0113] Figure 14 This is a timing diagram illustrating a transmission based on coordinated spatial reuse according to an example embodiment of the concept of the present invention. For example, Figure 14 The timing diagram illustrates the transmissions occurring in a UL / DL scenario involving coordinated spatial reuse. Figure 14In this context, the first stations STA11 and STA12 can be included in the first BSS BSS1 provided by the first access point AP1, and the second station STA2 can be included in the second BSS BSS2 provided by the second access point AP2.

[0114] refer to Figure 14 At time t21, the first access point AP1 can send PPDU PPDU0, which includes an announcement frame AF, to the second access point AP2. For example, the first access point AP1 can obtain the TXOP for receiving the first PPDU PPDU11 and PPDU12, and can send an announcement frame AF to the second access point AP2 to share the obtained TXOP.

[0115] At time t22, the first access point AP1 can send PPDU PPDU10, including the trigger frame TF, to the first stations STA11 and STA12, and the second access point AP2 can send the second PPDU PPDU2 to the second station STA2. At time t23, the first stations STA11 and STA12 can send the first PPDU PPDU11 and PPDU12 to the first access point AP1 in response to the trigger frame TF.

[0116] The first access point AP1 can generate an announcement frame (AF) based on the UL / DL scenario of coordinating space reuse, but if... Figure 14 As shown, the transmission of PPDU 10 (including trigger frame TF) and the transmission of PPDU 2 in the shared TXOP may overlap. To eliminate the overlap, if the second access point AP2 delays the transmission of the second PPDU 2 to time t23, the transmission of the first PPDU 11 and PPDU 12, as well as the second PPDU 2, will be successful; however, the completion of the transmission in the shared TXOP may be delayed. (Reference) Figure 15A and Figure 15B A method for successfully performing a transfer without delaying the completion of the transfer in a UL / DL scenario of coordinated spatial reuse will be described later.

[0117] Figure 15A and Figure 15B This is a timing diagram illustrating a transmission based on coordinated spatial reuse according to an example embodiment of the concept of the present invention. For example, Figure 15A and Figure 15B Each representation in the timing diagram occurs within a UL / DL scenario that coordinates spatial reuse. Figure 15A and Figure 15B In this context, the first stations STA11 and STA12 can be included in the first BSS BSS1 provided by the first access point AP1, and the second station STA2 can be included in the second BSS BSS2 provided by the second access point AP2. Figure 15A and Figure 15B For ease of explanation, further descriptions of the previously described components and technologies may be omitted in the description.

[0118] refer to Figure 15A At time t31, the first access point AP1 may send a PPDU0 including a notification frame AF to the second access point AP2 and the first stations STA11 and STA12. The notification frame AF may include a trigger information field 151. For example, the notification frame AF may include information such as information included in the notification frame AF. Figure 14 The trigger frame (TF) contains at least one subfield of the common information field and the user information field. Therefore, the transmission of a separate PPDU including the trigger frame can be omitted, and as a result, successful transmission can be completed earlier in UL / DL scenarios where space reuse is coordinated.

[0119] At time t32, first stations STA11 and STA12 can send first PPDU PPDU11 and PPDU12 to first access point AP1 in the shared TXOP, and second access point AP2 can send second PPDU PPDU2 to second station STA2 in the shared TXOP. For example, first stations STA11 and STA12 can obtain information for uplink transmission based on the value of trigger information field 151 of the advertisement frame AF, and can send first PPDU PPDU11 and PPDU12 to first access point AP1 based on the obtained information. The transmission of first PPDU PPDU11 and PPDU12 and second PPDU2 can be successfully completed. Therefore, at time t33, first access point AP1 can send first acknowledgment response BA1 to first stations STA11 and STA12, and second access point AP2 can send second acknowledgment response BA2 to second station STA2.

[0120] refer to Figure 15B At time t41, the first access point AP1 can send a PPDU PPDU0 containing an announcement frame AF and a trigger frame TF to the first stations STA11 and STA12 and the second access point AP2. For example, the announcement frame AF and the trigger frame TF can be aggregated into PPDU PPDU0. In some embodiments, the PPDU PPDU0 containing the aggregated announcement frame AF and trigger frame TF can have the format of an aggregated MAC Protocol Data Unit (A-MPDU). Therefore, the transmission of a separate PPDU including the trigger frame can be omitted, and as a result, transmission can be successfully completed earlier in UL / DL scenarios where spatial reuse is coordinated.

[0121] At time t42, the first stations STA11 and STA12 can send the first PPDU PPDU11 and PPDU12 to the first access point AP1 in the shared TXOP, and the second access point AP2 can send the second PPDU PPDU2 to the second station STA2 in the shared TXOP. Then, at time t43, the first access point AP1 can send the first acknowledgment response BA1 to the first stations STA11 and STA12, and the second access point AP2 can send the second acknowledgment response BA2 to the second station STA2.

[0122] Figure 16 This is a diagram illustrating an example embodiment of a wireless communication system 160 according to a concept of the present invention. Figure 16 As shown, the wireless communication system 160 may include a first access point AP11 to a fifth access point AP15.

[0123] In some embodiments, a shared access point can share a TXOP with multiple shared access points. For example, when a first access point AP11 obtains a TXOP for transmitting PPDUs, the first access point AP11 sends an announcement frame, thereby sharing the TXOP with the second to fifth access points AP15 among the adjacent access points. In some embodiments, the first access point AP11 may allow uplink and / or downlink transmissions to each of the second to fifth access points AP15. In some embodiments, the first access point AP11 may provide transmit power limits and / or tolerable interference limits to each of the second to fifth access points AP12. Therefore, various scenarios for coordinated spatial reuse can be implemented, and as a result, the efficiency of the wireless communication system 160 can be significantly improved.

[0124] In some embodiments, a shared access point can allocate radio resources for transmissions by multiple shared access points. For example, when a first access point AP11 obtains a TXOP to transmit PPDUs, AP11 can allocate the upper band of bandwidth to a second access point AP12 and the lower band of bandwidth to a third access point AP13 and a fourth access point AP14. To this end, AP11 can transmit a notification frame including resource allocation information (i.e., band allocation information), and each of the second access points AP12 through the fifth access point AP15 can identify a band based on the band allocation information included in the band frame and can transmit PPDUs to at least one station in the identified band.

[0125] Figure 17 This is a diagram illustrating an example of a device for wireless communication according to an exemplary embodiment of the concept of the present invention. For example, Figure 17An Internet of Things (IoT) network system is shown, including household gadgets 171, home appliances 172, entertainment devices 173, and access points 175.

[0126] In some embodiments, Figure 17 In a wireless communication device, the method for coordinating spatial reuse described above with reference to the accompanying drawings can be executed. For example, an access point 175 that obtains a TXOP (i.e., a shared access point) can share the TXOP with a neighboring access point (i.e., a shared access point), transmitting or receiving PPDUs from or from household gadgets 171, household appliances 172, and / or entertainment devices 173 within the shared TXOP. In some embodiments, household gadgets 171, household appliances 172, and / or entertainment devices 173 can report at least one path loss to access point 175. As described above with reference to the accompanying drawings, various scenarios for coordinating spatial reuse can be supported, thus enabling household gadgets 171, household appliances 172, and / or entertainment devices 173 to successfully transmit or receive PPDUs. Furthermore, in this embodiment, peripheral access points and stations do not delay PPDU transmission, resulting in improved efficiency of the IoT network system.

[0127] As is conventional in the field of the present invention, these blocks, units, and / or modules are described in terms of functional blocks, units, and / or modules, and exemplary embodiments are shown in the accompanying drawings. Those skilled in the art will understand that these blocks, units, and / or modules are physically implemented by electronic (or optical) circuitry, such as logic circuits, discrete components, microprocessors, hardwired circuits, storage elements, wiring connections, etc., which can be formed using semiconductor-based manufacturing techniques or other manufacturing techniques. Where blocks, units, and / or modules are implemented by microprocessors, etc., they can be programmed using software (e.g., microcode) to perform the various functions discussed herein, and may optionally be driven by firmware and / or software. Alternatively, each block, unit, and / or module may be implemented by dedicated hardware, or as a combination of dedicated hardware performing some functions and processors performing other functions (e.g., one or more programmed microprocessors and associated circuitry).

[0128] As those skilled in the art will understand, aspects of the inventive concept can be embodied as a system, method, or computer program product. Therefore, aspects of the inventive concept can take the form of a completely hardware embodiment, a completely software embodiment (including firmware, resident software, microcode, etc.), or an embodiment combining software and hardware aspects that may be collectively referred to herein as a “circuit,” “module,” “unit,” or “system.” Furthermore, aspects of the inventive concept can take the form of a computer program product embodied in one or more computer-readable media having computer-readable program code embodied thereon. If implemented in software, the functionality can be stored as one or more instructions or code on or transmitted thereon on a tangible, non-transitory computer-readable medium.

[0129] While the inventive concept has been specifically shown and described with reference to examples thereof, those skilled in the art will understand that various changes in form and detail may be made therein without departing from the spirit and scope of the inventive concept as defined by the appended claims.

Claims

1. A wireless communication method performed by a first device, the method comprising: Acquire the opportunity to send or receive a first physical layer protocol data unit (PPDU) (TXOP); Identify a second device for sharing the TXOP; Obtain first information about the first path loss between the first device and at least one third device that receives or transmits the first PPDU; Based on the first path loss and the minimum signal-to-interference ratio of the first device, the tolerable interference limit is determined. Allows sharing of the second PPDU in the TXOP to at least one of the transmission and reception of the second device; as well as In the shared TXOP, the first PPDU is sent to or received from the at least one third device. Wherein, allowing at least one of the transmission and reception of the second PPDU includes allowing the reception of the second PPDU, and Allowing the reception of the second PPDU includes providing the second device with tolerable interference limits for the transmission or reception of the first PPDU.

2. The method according to claim 1, wherein, Allowing at least one of the transmission and reception of the second PPDU includes providing the second device with information indicating that the transmission and / or reception of the second PPDU is permitted.

3. The method according to claim 1, wherein, Allowing at least one of the transmission and reception of the second PPDU includes allowing the transmission of the second PPDU, and Allowing the transmission of the second PPDU includes providing the second device with a transmission power limit for transmitting the second PPDU.

4. The method according to claim 3, further comprising: Obtain second information regarding the loss of at least one second path; as well as The transmit power limit is determined based on the at least one second path loss.

5. The method according to claim 4, wherein, Obtaining second information about the at least one second path loss includes receiving information about the third path loss between the first device and one of the at least one third device from one of the at least one third device; as well as Receive information from the second device regarding the fourth path loss between the second device and one of the at least one third device.

6. The method according to claim 4, wherein, Obtaining second information about the at least one second path loss includes receiving information about the third path loss between the first device and the at least one of the at least three devices from one of the at least one third device; as well as Based on the frames received from the second device, a fourth path loss between the first device and the second device is determined.

7. The method according to claim 6, wherein, Determining the fourth path loss includes extracting transmission power information from the frame; Measure the received power of the frame; and The fourth path loss is calculated based on the transmitted power information and the measured received power.

8. The method according to claim 1, wherein, Obtaining first information about the first path loss includes receiving information about a second path loss between the first device and one of the at least one third device from one of the at least one third device, and The tolerance interference limit is determined based on the transmission power of the first PPDU, the second path loss, and the minimum signal-to-interference ratio.

9. The method according to claim 1, wherein, Allowing at least one of the transmission and reception of the second PPDU includes allowing only the transmission of the second PPDU.

10. The method according to claim 1, wherein, Allowing at least one of the transmission and reception of the second PPDU includes sending a notification frame to the second device.

11. The method according to claim 10, wherein, When the TXOP is obtained to receive the first PPDU, the notification frame includes information included in the trigger frame for receiving the first PPDU, and The transmission of the trigger frame to the at least one third device is omitted.

12. The method of claim 10, further comprising: When the TXOP is obtained to receive the first PPDU, a trigger frame is sent to the at least one third device. The notification frame and the trigger frame are aggregated into a single PPDU.

13. A wireless communication method performed by a second device sharing a transmission opportunity (TXOP) with a first device, the method comprising: The first device of the TXOP that acquires, transmits or receives, a first physical layer protocol data unit (PPDU) receives permission for coordination space reuse. Based on the permission for coordination space reuse, at least one of the transmission and reception of the second PPDU is identified; In a shared TXOP, the second PPDU is sent to one of at least one third device, or the second PPDU is received from one of the at least one third device; Tolerable interference limits for transmitting or receiving the first PPDU from the first device, wherein the tolerable interference limits are determined based on a first path loss between the first device and another of the at least one third device that receives or transmits the first PPDU and the minimum signal-to-interference ratio of the first device. as well as When the reception of the second PPDU is detected, the transmission power of one of the at least one third device is limited based on the tolerable interference limit and at least one path loss associated with the first device.

14. The method of claim 13, further comprising: The transmit power limit received from the first device for the second PPDU. The transmission or reception of the second PPDU includes transmitting the second PPDU to one of the at least one third device at a transmission power approximately equal to or less than the transmission power limit.

15. The method of claim 13, further comprising: Receive at least one PPDU from the first device and at least one device associated with the first device; as well as Based on the received power of the at least one PPDU, the transmission power of one of the at least one third device is limited.

16. A wireless communication method performed by a third device associated with a second device in a transmission opportunity (TXOP) shared by a first device and a second device, the method comprising: Receive frames from the first device; The second path loss between the first device and the third device is determined based on the frame; Send information about the second path loss to the second device; as well as In the shared TXOP, the second physical layer protocol data unit (PPDU) is received from the second device, or the second PPDU is sent to the second device. The receiving or transmitting of the second PPDU is controlled by the second device based on the second path loss and the tolerable interference limit of the first PPDU transmitted or received by the first device from the first device to the second device, wherein the tolerable interference limit is determined based on the first path loss between the first device and the fourth device receiving or transmitting the first PPDU and the minimum signal-to-interference ratio of the first device.

17. The method according to claim 16, wherein, Determining the second path loss includes: Extract transmission power information from the frame; Measure the received power of the frame; and The second path loss is calculated based on the transmitted power information and the measured received power.

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