WO2022220487A1 - 무선랜 시스템에서 프리앰블 펑처링 기반의 전송 방법 및 장치 - Google Patents
무선랜 시스템에서 프리앰블 펑처링 기반의 전송 방법 및 장치 Download PDFInfo
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Definitions
- the present disclosure relates to a transmission method and apparatus in a wireless local area network (WLAN) system, and more particularly, to a preamble puncturing-based transmission method and apparatus in a next-generation wireless LAN system. .
- WLAN wireless local area network
- Wi-Fi wireless LAN
- technologies recently introduced in WLAN include enhancements for Very High-Throughput (VHT) of the 802.11ac standard, and improvements for High Efficiency (HE) of the IEEE 802.11ax standard. do.
- VHT Very High-Throughput
- HE High Efficiency
- EHT Extremely High Throughput
- MIMO Multiple Input Multiple Output
- AP multiple access point
- low latency low latency
- various technologies for supporting traffic of real time characteristics are being studied.
- An object of the present disclosure is to provide a transmission method and apparatus based on preamble puncturing.
- An additional technical problem of the present disclosure is to provide a method and an apparatus for transmitting a non-initial PPDU based on preamble puncturing.
- An additional technical problem of the present disclosure is to provide a method and apparatus for performing a transmission operation except for a subchannel in which transmission is impossible within an allocated/indicated channel.
- a first physical layer protocol data unit is used as a first STA transmitting; and receiving, from the first STA, a second PPDU based on at least one second punctured resource unit corresponding to the first PPDU, wherein the first PPDU includes at least one first punctured ( punctured) resource unit, and the at least one first punctured resource unit may be at least a portion of the at least one second punctured resource unit.
- PPDU physical layer protocol data unit
- a method of performing communication by a second station (STA) in a wireless LAN system transmits a first physical layer protocol data unit (PPDU) to a first STA to do; and receiving, from the first STA, a second PPDU based on at least one second punctured resource unit corresponding to the first PPDU, wherein the at least one first punctured resource unit comprises the at least one It may be at least a part of one second punctured resource unit.
- PPDU physical layer protocol data unit
- a transmission method and apparatus based on preamble puncturing may be provided.
- a method and apparatus for transmitting a non-initial PPDU based on preamble puncturing may be provided.
- a method and apparatus for performing a transmission operation except for a subchannel that cannot be transmitted within an allocated/indicated channel may be provided.
- not only the AP, but also other STAs can mitigate interference between adjacent cells by performing a transmission operation in the remaining subchannels except for the subchannel in which transmission is impossible.
- the STA transmitting the non-initial PPDU can inform the other STA of a subchannel that cannot be transmitted, so that radio resource utilization can be increased.
- FIG. 1 illustrates a block diagram of a wireless communication apparatus according to an embodiment of the present disclosure.
- FIG. 2 is a diagram illustrating an exemplary structure of a wireless LAN system to which the present disclosure can be applied.
- FIG. 3 is a diagram for explaining a link setup process to which the present disclosure can be applied.
- FIG. 4 is a diagram for explaining a backoff process to which the present disclosure can be applied.
- FIG. 5 is a diagram for explaining a CSMA/CA-based frame transmission operation to which the present disclosure can be applied.
- FIG. 6 is a diagram for explaining an example of a frame structure used in a wireless LAN system to which the present disclosure can be applied.
- FIG. 7 is a diagram illustrating examples of a PPDU defined in the IEEE 802.11 standard to which the present disclosure can be applied.
- 8 to 10 are diagrams for explaining examples of resource units of a WLAN system to which the present disclosure can be applied.
- FIG. 11 shows an exemplary structure of the HE-SIG-B field.
- FIG. 12 is a diagram for describing an MU-MIMO scheme in which a plurality of users/STAs are allocated to one RU.
- FIG. 13 shows an example of a PPDU format to which the present disclosure can be applied.
- FIG 14 shows an example of an EHT operation element to which the present disclosure can be applied.
- 15 is a diagram for describing a PPDU transmission operation of a first STA according to an embodiment of the present disclosure.
- 16 is a diagram for describing a PPDU transmission operation of a second STA according to an embodiment of the present disclosure.
- a component when a component is “connected”, “coupled” or “connected” to another component, it is not only a direct connection relationship, but also an indirect connection relationship in which another component exists between them. may also include. Also in this disclosure the terms “comprises” or “having” specify the presence of a recited feature, step, operation, element and/or component, but one or more other features, steps, operations, elements, components and/or The presence or addition of groups thereof is not excluded.
- first and second are used only for the purpose of distinguishing one component from other components and are not used to limit the components, unless otherwise specified. It does not limit the order or importance between them. Accordingly, within the scope of the present disclosure, a first component in one embodiment may be referred to as a second component in another embodiment, and similarly, a second component in one embodiment is referred to as a first component in another embodiment. may also be called
- Examples of the present disclosure may be applied to various wireless communication systems.
- examples of the present disclosure may be applied to a wireless LAN system.
- examples of the present disclosure may be applied to a WLAN based on IEEE 802.11a/g/n/ac/ax standards.
- examples of the present disclosure may be applied to a newly proposed IEEE 802.11be (or EHT) standard-based WLAN.
- Examples of the present disclosure may be applied to a WLAN based on the IEEE 802.11be release-2 standard, which corresponds to an additional improvement technology of the IEEE 802.11be release-1 standard.
- examples of the present disclosure may be applied to a next-generation standard-based WLAN after IEEE 802.11be.
- examples of the present disclosure may be applied to a cellular wireless communication system.
- it may be applied to a cellular wireless communication system based on a Long Term Evolution (LTE)-based technology and a 5G New Radio (NR)-based technology of a 3rd Generation Partnership Project (3GPP) standard.
- LTE Long Term Evolution
- FIG. 1 illustrates a block diagram of a wireless communication apparatus according to an embodiment of the present disclosure.
- the first device 100 and the second device 200 illustrated in FIG. 1 are a terminal, a wireless device, a wireless transmit receive unit (WTRU), a user equipment (UE), and a mobile station (MS). ), UT (user terminal), MSS (Mobile Subscriber Station), MSS (Mobile Subscriber Unit), SS (Subscriber Station), AMS (Advanced Mobile Station), WT (Wireless terminal), or simply a user. may be substituted for the term.
- an access point Access Point, AP
- BS Base Station
- fixed station fixed station
- Node B base transceiver system
- a network It may be replaced by various terms such as an artificial intelligence (AI) system, a road side unit (RSU), a repeater, a router, a relay, and a gateway.
- AI artificial intelligence
- RSU road side unit
- the devices 100 and 200 illustrated in FIG. 1 may be referred to as a station (STA).
- the devices 100 and 200 illustrated in FIG. 1 may be referred to by various terms such as a transmitting device, a receiving device, a transmitting STA, and a receiving STA.
- the STAs 110 and 200 may perform an access point (AP) role or a non-AP role. That is, in the present disclosure, the STAs 110 and 200 may perform AP and/or non-AP functions.
- AP access point
- the STAs 110 and 200 may perform AP and/or non-AP functions.
- the STAs 110 and 200 may be simply referred to as APs, or when the STAs 110 and 200 perform a non-AP function, they may be simply referred to as STAs.
- the AP may also be indicated as an AP STA.
- a first device 100 and a second device 200 may transmit and receive wireless signals through various wireless LAN technologies (eg, IEEE 802.11 series).
- the first device 100 and the second device 200 may include interfaces for a medium access control (MAC) layer and a physical layer (PHY) complying with the IEEE 802.11 standard.
- MAC medium access control
- PHY physical layer
- the first device 100 and the second device 200 may additionally support various communication standard (eg, 3GPP LTE series, 5G NR series standards, etc.) technologies other than the WLAN technology.
- the device of the present disclosure may be implemented as various devices such as a mobile phone, a vehicle, a personal computer, augmented reality (AR) equipment, and virtual reality (VR) equipment.
- the STA of the present specification is a voice call, video call, data communication, autonomous driving (Autonomous-Driving), MTC (Machine-Type Communication), M2M (Machine-to-Machine), D2D (Device-to-Device), Various communication services such as Internet-of-Things (IoT) can be supported.
- IoT Internet-of-Things
- the first device 100 includes one or more processors 102 and one or more memories 104 , and may further include one or more transceivers 106 and/or one or more antennas 108 .
- the processor 102 controls the memory 104 and/or the transceiver 106 and may be configured to implement the descriptions, functions, procedures, suggestions, methods, and/or operational flowcharts disclosed in this disclosure.
- the processor 102 may process the information in the memory 104 to generate the first information/signal, and then transmit a wireless signal including the first information/signal through the transceiver 106 .
- the processor 102 may receive the radio signal including the second information/signal through the transceiver 106 , and then store the information obtained from the signal processing of the second information/signal in the memory 104 .
- the memory 104 may be connected to the processor 102 and may store various information related to the operation of the processor 102 .
- memory 104 provides instructions for performing some or all of the processes controlled by processor 102 , or for performing descriptions, functions, procedures, suggestions, methods, and/or operational flowcharts disclosed in this disclosure. It can store software code including (instructions).
- the processor 102 and the memory 104 may be a part of a communication modem/circuit/chip designed to implement a wireless LAN technology (eg, IEEE 802.11 series).
- the transceiver 106 may be coupled with the processor 102 and may transmit and/or receive wireless signals via one or more antennas 108 .
- the transceiver 106 may include a transmitter and/or a receiver.
- the transceiver 106 may be used interchangeably with a radio frequency (RF) unit.
- RF radio frequency
- a device may mean a communication modem/circuit/chip.
- the second device 200 includes one or more processors 202 , one or more memories 204 , and may further include one or more transceivers 206 and/or one or more antennas 208 .
- the processor 202 controls the memory 204 and/or the transceiver 206 and may be configured to implement the descriptions, functions, procedures, suggestions, methods, and/or operational flowcharts disclosed in this disclosure.
- the processor 202 may process the information in the memory 204 to generate third information/signal, and then transmit a wireless signal including the third information/signal through the transceiver 206 .
- the processor 202 may receive the radio signal including the fourth information/signal through the transceiver 206 , and then store information obtained from signal processing of the fourth information/signal in the memory 204 .
- the memory 204 may be connected to the processor 202 and may store various information related to the operation of the processor 202 .
- the memory 204 may provide instructions for performing some or all of the processes controlled by the processor 202 , or for performing the descriptions, functions, procedures, suggestions, methods, and/or operational flowcharts disclosed in this disclosure. may store software code including
- the processor 202 and the memory 204 may be a part of a communication modem/circuit/chip designed to implement a wireless LAN technology (eg, IEEE 802.11 series).
- the transceiver 206 may be coupled to the processor 202 and may transmit and/or receive wireless signals via one or more antennas 208 .
- the transceiver 206 may include a transmitter and/or a receiver.
- the transceiver 206 may be used interchangeably with an RF unit.
- a device may mean a communication modem/circuit/chip.
- one or more protocol layers may be implemented by one or more processors 102 , 202 .
- one or more processors 102 , 202 may implement one or more layers (eg, functional layers such as PHY, MAC).
- the one or more processors 102, 202 may be configured to process one or more PDU (Protocol Data Unit) and/or one or more SDU (Service Data Unit) according to the description, function, procedure, proposal, method and/or operation flowchart disclosed in this disclosure.
- PDU Protocol Data Unit
- SDU Service Data Unit
- One or more processors 102 , 202 may generate messages, control information, data, or information according to the description, function, procedure, proposal, method, and/or flow charts disclosed in this disclosure.
- the one or more processors 102, 202 transmit a signal (eg, a baseband signal) including PDUs, SDUs, messages, control information, data or information according to the functions, procedures, proposals and/or methods disclosed in the present disclosure. generated and provided to one or more transceivers (106, 206).
- the one or more processors 102 , 202 may receive signals (eg, baseband signals) from one or more transceivers 106 , 206 , the descriptions, functions, procedures, proposals, methods and/or methods disclosed in this disclosure.
- PDU, SDU, message, control information, data or information may be obtained according to the operation flowcharts.
- One or more processors 102 , 202 may be referred to as a controller, microcontroller, microprocessor, or microcomputer.
- One or more processors 102 , 202 may be implemented by hardware, firmware, software, or a combination thereof.
- ASICs Application Specific Integrated Circuits
- DSPs Digital Signal Processors
- DSPDs Digital Signal Processing Devices
- PLDs Programmable Logic Devices
- FPGAs Field Programmable Gate Arrays
- the descriptions, functions, procedures, proposals, methods, and/or flowcharts of operations disclosed in this disclosure may be implemented using firmware or software, and the firmware or software may be implemented to include modules, procedures, functions, and the like.
- the descriptions, functions, procedures, proposals, methods, and/or flow charts disclosed in this disclosure provide firmware or software configured to perform one or more of the processors 102 , 202 , or stored in one or more memories 104 , 204 . It may be driven by the above processors 102 and 202 .
- the descriptions, functions, procedures, proposals, methods, and/or flowcharts of operations disclosed in this disclosure may be implemented using firmware or software in the form of code, instructions, and/or a set of instructions.
- One or more memories 104 , 204 may be coupled with one or more processors 102 , 202 and may store various forms of data, signals, messages, information, programs, code, instructions, and/or instructions.
- the one or more memories 104 and 204 may be comprised of ROM, RAM, EPROM, flash memory, hard drives, registers, cache memory, computer readable storage media, and/or combinations thereof.
- One or more memories 104 , 204 may be located inside and/or external to one or more processors 102 , 202 .
- one or more memories 104 , 204 may be coupled to one or more processors 102 , 202 through various technologies, such as wired or wireless connections.
- One or more transceivers 106 , 206 may transmit user data, control information, radio signals/channels, etc. referred to in the methods and/or operational flowcharts of the present disclosure, to one or more other devices.
- One or more transceivers 106, 206 may receive user data, control information, radio signals/channels, etc. referred to in the descriptions, functions, procedures, suggestions, methods, and/or flow charts, etc. disclosed in this disclosure from one or more other devices. have.
- one or more transceivers 106 , 206 may be coupled to one or more processors 102 , 202 and may transmit and receive wireless signals.
- one or more processors 102 , 202 may control one or more transceivers 106 , 206 to transmit user data, control information, or wireless signals to one or more other devices.
- one or more processors 102 , 202 may control one or more transceivers 106 , 206 to receive user data, control information, or wireless signals from one or more other devices.
- one or more transceivers 106 , 206 may be coupled with one or more antennas 108 , 208 , and the one or more transceivers 106 , 206 may be connected via one or more antennas 108 , 208 to the descriptions, functions, and functions disclosed in this disclosure. , procedures, proposals, methods and/or operation flowcharts, etc.
- one or more antennas may be a plurality of physical antennas or a plurality of logical antennas (eg, antenna ports).
- the one or more transceivers 106, 206 convert the received radio signal/channel, etc. from the RF band signal to process the received user data, control information, radio signal/channel, etc. using the one or more processors 102, 202. It can be converted into a baseband signal.
- One or more transceivers 106 and 206 may convert user data, control information, radio signals/channels, etc. processed using one or more processors 102 and 202 from baseband signals to RF band signals.
- one or more transceivers 106 , 206 may include (analog) oscillators and/or filters.
- one of the STAs 100 and 200 may perform an intended operation of an AP, and the other of the STAs 100 and 200 may perform an intended operation of a non-AP STA.
- the transceivers 106 and 206 of FIG. 1 transmit and receive signals (eg, packets or Physical Layer Protocol Data Units (PPDUs) according to IEEE 802.11a/b/g/n/ac/ax/be, etc.) action can be performed.
- signals eg, packets or Physical Layer Protocol Data Units (PPDUs) according to IEEE 802.11a/b/g/n/ac/ax/be, etc.
- PPDUs Physical Layer Protocol Data Units
- an operation in which various STAs generate transmit/receive signals or perform data processing or operations in advance for transmit/receive signals may be performed by the processors 102 and 202 of FIG. 1 .
- an example of an operation of generating a transmission/reception signal or performing data processing or operation in advance for a transmission/reception signal is 1) a field included in a PPDU (SIG (signal), STF (short training field), LTF (long training field), data, etc.) operation to determine/obtain/configure/compute/decode/encode, 2) time resources or frequencies used for fields (SIG, STF, LTF, Data, etc.) included in the PPDU
- An operation of determining/configuring/obtaining a resource eg, a subcarrier resource), etc., 3) a specific sequence (eg, a pilot sequence) used for a field (SIG, STF, LTF, Data, etc.) included in the PPDU , STF / LTF sequence, operation of determining / configuring / obtaining (extra sequence applied to SIG), etc., 4) power control operation and / or power saving operation applied to the STA, 5) ACK signal determination / acquisition / configuration
- various information used by various STAs for determination/acquisition/configuration/computation/decoding/encoding of transmit/receive signals may be stored in the memories 104 and 204 of FIG. 1 .
- downlink means a link for communication from an AP STA to a non-AP STA, and downlink PPDU/packet/signal may be transmitted/received through the downlink.
- a transmitter may be a part of an AP STA, and a receiver may be a part of a non-AP STA.
- Uplink (UL) refers to a link for communication from a non-AP STA to an AP STA, and may transmit/receive an uplink PPDU/packet/signal through the uplink.
- a transmitter may be a part of a non-AP STA, and a receiver may be a part of an AP STA.
- FIG. 2 is a diagram illustrating an exemplary structure of a wireless LAN system to which the present disclosure can be applied.
- the structure of the wireless LAN system may be composed of a plurality of components.
- a wireless LAN supporting STA mobility transparent to an upper layer may be provided by interaction of a plurality of components.
- a Basic Service Set (BSS) corresponds to a basic building block of a wireless LAN.
- BSS Basic Service Set
- FIG. 2 two BSSs (BSS1 and BSS2) exist, and two STAs are included as members of each BSS (STA1 and STA2 are included in BSS1, and STA3 and STA4 are included in BSS2) by way of example show
- the ellipse indicating the BSS in FIG. 2 may also be understood as indicating a coverage area in which STAs included in the corresponding BSS maintain communication. This area may be referred to as a Basic Service Area (BSA).
- BSA Basic Service Area
- the IBSS may have a minimal form consisting of only two STAs.
- BSS1 configured only with STA1 and STA2 or BSS2 configured with only STA3 and STA4 may correspond to representative examples of IBSS, respectively.
- This configuration is possible when STAs can communicate directly without an AP.
- this type of wireless LAN it is not configured in advance, but may be configured when a LAN is needed, and this may be referred to as an ad-hoc network.
- IBSS does not include an AP, there is no centralized management entity that performs a centralized management function. That is, in IBSS, STAs are managed in a distributed manner. In the IBSS, all STAs may be mobile STAs, and access to a distributed system (DS) is not allowed to form a self-contained network.
- DS distributed system
- the membership of the STA in the BSS may be dynamically changed by turning the STA on or off, the STA entering or leaving the BSS area, and the like.
- the STA may join the BSS using a synchronization process.
- the STA In order to access all services of the BSS infrastructure, the STA must be associated with the BSS. This association may be dynamically established and may include the use of a Distribution System Service (DSS).
- DSS Distribution System Service
- the direct STA-to-STA distance in the WLAN may be limited by PHY performance. In some cases, this distance limit may be sufficient, but in some cases, communication between STAs at a greater distance may be required.
- a distributed system (DS) may be configured to support extended coverage.
- DS means a structure in which BSSs are interconnected.
- a BSS may exist as a component of an extended form of a network composed of a plurality of BSSs.
- DS is a logical concept and can be specified by the characteristics of a distributed system medium (DSM).
- DSM distributed system medium
- WM wireless medium
- DSM may be logically divided.
- Each logical medium serves a different purpose and is used by different components. These media are not limited to being the same nor to being different. Since the plurality of media are logically different as described above, the flexibility of the WLAN structure (DS structure or other network structure) can be explained. That is, the WLAN structure may be implemented in various ways, and the corresponding WLAN structure may be independently specified by the physical characteristics of each implementation.
- a DS may support a mobile device by providing seamless integration of a plurality of BSSs and providing logical services necessary for handling addresses to destinations.
- the DS may further include a component called a portal that serves as a bridge for connection between the WLAN and another network (eg, IEEE 802.X).
- the AP means an entity that enables access to the DS through the WM for the combined non-AP STAs and also has the functionality of the STA. Data movement between the BSS and DS may be performed through the AP.
- STA2 and STA3 shown in FIG. 2 provide a function to allow combined non-AP STAs (STA1 and STA4) to access the DS while having STA functionality.
- all APs basically correspond to STAs, all APs are addressable entities.
- the address used by the AP for communication on the WM and the address used by the AP for communication on the DSM are not necessarily the same.
- a BSS composed of an AP and one or more STAs may be referred to as an infrastructure BSS.
- Data transmitted from one of the STA(s) coupled to the AP to the STA address of the AP is always received at an uncontrolled port and may be processed by an IEEE 802.1X port access entity.
- transmission data (or frame) may be transmitted to the DS.
- an extended service set (ESS) for providing wide coverage may be configured.
- the ESS refers to a network in which a network having an arbitrary size and complexity is composed of DS and BSS.
- the ESS may correspond to a set of BSSs connected to one DS. However, the ESS does not include the DS.
- the characteristic of the ESS network is that it appears as an IBSS in the LLC (Logical Link Control) layer. STAs included in the ESS can communicate with each other, and mobile STAs can move from one BSS to another (within the same ESS) transparently to the LLC.
- APs included in one ESS may have the same service set identification (SSID).
- the SSID is distinguished from the BSSID, which is an identifier of the BSS.
- the WLAN system does not assume anything about the relative physical positions of BSSs, and all of the following types are possible.
- BSSs may partially overlap, which is a commonly used form to provide continuous coverage.
- the BSSs may not be physically connected, and there is no logical limit to the distance between the BSSs.
- the BSSs may be physically located at the same location, which may be used to provide redundancy.
- one (or one or more) IBSS or ESS networks may physically exist in the same space as one (or more than one) ESS network. This is when an ad-hoc network operates at a location where the ESS network exists, when wireless networks that overlap physically by different organizations are configured, or when two or more different access and security policies are required at the same location It may correspond to the form of an ESS network in the
- FIG. 3 is a diagram for explaining a link setup process to which the present disclosure can be applied.
- the link setup process may also be referred to as a session initiation process or a session setup process.
- the process of discovery, authentication, association, and security setting of the link setup process may be collectively referred to as an association process.
- the STA may perform a network discovery operation.
- the network discovery operation may include a scanning operation of the STA. That is, in order for the STA to access the network, it must find a network in which it can participate. An STA must identify a compatible network before participating in a wireless network. The process of identifying a network existing in a specific area is called scanning.
- Scanning methods include active scanning and passive scanning.
- 3 exemplarily illustrates a network discovery operation including an active scanning process.
- active scanning an STA performing scanning transmits a probe request frame to discover which APs exist around it while moving channels, and waits for a response thereto.
- a responder transmits a probe response frame to the STA that has transmitted the probe request frame in response to the probe request frame.
- the responder may be an STA that last transmitted a beacon frame in the BSS of the channel being scanned.
- the AP since the AP transmits a beacon frame, the AP becomes the responder.
- the STAs in the IBSS rotate and transmit the beacon frame, so the responder is not constant.
- an STA that transmits a probe request frame on channel 1 and receives a probe response frame on channel 1 stores BSS-related information included in the received probe response frame and channel) to perform scanning (ie, probe request/response transmission/reception on channel 2) in the same way.
- the scanning operation may be performed in a passive scanning manner.
- passive scanning an STA performing scanning waits for a beacon frame while moving channels.
- the beacon frame is one of the management frames defined in IEEE 802.11, and is periodically transmitted to inform the existence of a wireless network, and to allow a scanning STA to search for a wireless network and participate in the wireless network.
- the AP plays a role of periodically transmitting a beacon frame, and in the IBSS, the STAs in the IBSS rotate and transmit the beacon frame.
- the STA performing scanning receives the beacon frame, it stores information on the BSS included in the beacon frame and records beacon frame information in each channel while moving to another channel.
- the STA may store BSS-related information included in the received beacon frame, move to the next channel, and perform scanning on the next channel in the same manner. Comparing active scanning and passive scanning, active scanning has an advantage in that the delay and power consumption are smaller than that of passive scanning.
- step S320 After the STA discovers the network, an authentication process may be performed in step S320.
- This authentication process may be referred to as a first authentication process in order to clearly distinguish it from the security setup operation of step S340 to be described later.
- the authentication process includes a process in which the STA transmits an authentication request frame to the AP, and in response, the AP transmits an authentication response frame to the STA.
- An authentication frame used for an authentication request/response corresponds to a management frame.
- the authentication frame includes an authentication algorithm number, an authentication transaction sequence number, a status code, a challenge text, a Robust Security Network (RSN), and a Finite Cyclic Group), etc. may be included. This corresponds to some examples of information that may be included in the authentication request/response frame, and may be replaced with other information, or additional information may be further included.
- RSN Robust Security Network
- Finite Cyclic Group Finite Cyclic Group
- the STA may transmit an authentication request frame to the AP.
- the AP may determine whether to allow authentication for the corresponding STA based on information included in the received authentication request frame.
- the AP may provide the result of the authentication process to the STA through the authentication response frame.
- an association process may be performed in step S330.
- the association process includes a process in which the STA transmits an association request frame to the AP, and in response, the AP transmits an association response frame to the STA.
- the association request frame includes information related to various capabilities, a beacon listening interval, a service set identifier (SSID), supported rates, supported channels, RSN, and mobility. It may include information on a domain, supported operating classes, a TIM broadcast request (Traffic Indication Map Broadcast request), interworking service capability, and the like.
- the association response frame includes information related to various capabilities, status codes, Association IDs (AIDs), supported rates, Enhanced Distributed Channel Access (EDCA) parameter sets, RCPI (Received Channel Power Indicator), RSNI (Received Signal to Noise Indicator), mobility domain, timeout interval (eg, association comeback time), overlapping BSS scan parameters, TIM broadcast response, quality of service (QoS) map, etc. can do. This corresponds to some examples of information that may be included in the combination request/response frame, and may be replaced with other information, or additional information may be further included.
- a security setup process may be performed in step S340.
- the security setup process of step S340 may be called an authentication process through RSNA (Robust Security Network Association) request/response, and the authentication process of step S320 is called a first authentication process, and the security setup process of step S340 may be simply referred to as an authentication process.
- RSNA Robot Security Network Association
- the security setup process of step S340 may include, for example, a process of private key setup through 4-way handshaking through an Extensible Authentication Protocol over LAN (EAPOL) frame.
- the security setup process may be performed according to a security method not defined in the IEEE 802.11 standard.
- FIG. 4 is a diagram for explaining a backoff process to which the present disclosure can be applied.
- the basic access mechanism of MAC is a CSMA/CA (Carrier Sense Multiple Access with Collision Avoidance) mechanism.
- the CSMA/CA mechanism also called Distributed Coordination Function (DCF) of IEEE 802.11 MAC, basically adopts a "listen before talk" access mechanism.
- DCF Distributed Coordination Function
- the AP and/or STA senses a radio channel or medium for a predetermined time period (eg, DCF Inter-Frame Space (DIFS)).
- DIFS DCF Inter-Frame Space
- the IEEE 802.11 MAC protocol provides a Hybrid Coordination Function (HCF).
- HCF is based on the DCF and the Point Coordination Function (PCF).
- PCF refers to a method of periodically polling so that all receiving APs and/or STAs can receive a data frame in a polling-based synchronous access method.
- HCF has EDCA (Enhanced Distributed Channel Access) and HCCA (HCF Controlled Channel Access).
- EDCA is a contention-based access method for a provider to provide data frames to multiple users, and HCCA uses a contention-free channel access method using a polling mechanism.
- the HCF includes a medium access mechanism to improve the quality of service (QoS) of the WLAN, and can transmit QoS data in both the contention period (CP) and the contention free period (CFP). .
- QoS quality of service
- CW is a contention window parameter value.
- CWmin is given as an initial value for the CW parameter, it may take a double value in case of transmission failure (eg, when an ACK for a transmitted frame is not received).
- the STA continuously monitors the medium while counting down the backoff slot according to the determined backoff count value.
- the medium is monitored as occupied, it stops and waits to count down, and resumes the rest of the countdown when the medium becomes idle.
- STA3 may check that the medium is idle by DIFS and immediately transmit the frame. The remaining STAs monitor whether the medium is in an occupied/busy state and wait. In the meantime, data to be transmitted may be generated from each of STA1, STA2, and STA5, and each STA waits for DIFS when the medium is monitored as idle, and then counts down the backoff slot according to the random backoff count value selected by each STA can be performed. It is assumed that STA2 selects the smallest backoff count value and STA1 selects the largest backoff count value.
- STA1 and STA5 stop counting down for a while and wait while STA2 occupies the medium.
- STA1 and STA5 wait for DIFS and then resume the stopped backoff count. That is, after counting down the remaining backoff slots for the remaining backoff time, frame transmission may be started. Since the remaining backoff time of STA5 is shorter than that of STA1, STA5 starts frame transmission. While STA2 occupies the medium, STA4 may also generate data to transmit.
- the STA4 when the medium becomes idle, it waits for as long as DIFS, then may perform a countdown according to the random backoff count value selected by the STA4 and start transmitting the frame.
- the example of FIG. 4 shows a case in which the remaining backoff time of STA5 coincides with the random backoff count value of STA4, and in this case, a collision may occur between STA4 and STA5.
- both STA4 and STA5 do not receive an ACK, and data transmission fails.
- STA4 and STA5 may select a random backoff count value and perform a countdown.
- STA1 waits while the medium is in the occupied state due to the transmission of STA4 and STA5, waits for DIFS when the medium becomes idle, and may start frame transmission when the remaining backoff time elapses.
- the data frame is a frame used for transmission of data forwarded to a higher layer, and may be transmitted after a backoff performed after DIFS elapses from when the medium becomes idle.
- the management frame is a frame used for exchanging management information that is not forwarded to an upper layer, and is transmitted after a backoff performed after an IFS such as DIFS or PIFS (Point coordination function IFS).
- IFS such as DIFS or PIFS (Point coordination function IFS).
- Subtype frame of the management frame Beacon, association request/response, re--association request/response, probe request/response, authentication request/response (authentication) request/response), etc.
- a control frame is a frame used to control access to a medium.
- RTS Request-To-Send
- CTS Clear-To-Send
- ACK Acknowledgment
- PS-Poll Power Save-Poll
- block ACK BlockAck
- BlockACKReq NDP announcement
- SIFS short IFS
- the QoS (Quality of Service) STA is an arbitration IFS (AIFS) for an access category (AC) to which the frame belongs, that is, AIFS[i] (where i is a value determined by the AC).
- AIFS[i] an arbitration IFS
- AC access category
- the frame in which AIFS[i] can be used may be a data frame or a management frame, and may also be a control frame other than a response frame.
- FIG. 5 is a diagram for explaining a CSMA/CA-based frame transmission operation to which the present disclosure can be applied.
- the CSMA/CA mechanism includes virtual carrier sensing in addition to physical carrier sensing in which the STA directly senses the medium.
- Virtual carrier sensing is to compensate for problems that may occur in medium access, such as a hidden node problem.
- the MAC of the STA may use a Network Allocation Vector (NAV).
- NAV Network Allocation Vector
- the NAV is a value indicating to other STAs the time remaining until the medium is used or the STA is authorized to use the current medium. Therefore, the value set to NAV corresponds to a period in which the medium is scheduled to be used by the STA transmitting the frame, and the STA receiving the NAV value is prohibited from accessing the medium during the corresponding period.
- the NAV may be set based on the value of the "duration" field of the MAC header of the frame.
- STA1 intends to transmit data to STA2, and STA3 is in a position capable of overhearing some or all of a frame transmitted/received between STA1 and STA2.
- a mechanism using an RTS/CTS frame may be applied.
- an STA outside the transmission range of one of STA1 or STA2, or an STA outside the carrier sensing range for transmission from STA1 or STA3 through the exchange of RTS/CTS frames, between STA1 and STA2 Channel occupation may not be attempted during data transmission/reception.
- STA1 may determine whether a channel is being used through carrier sensing. In terms of physical carrier sensing, the STA1 may determine the channel occupancy idle state based on the signal correlation or the energy level detected in the channel. In addition, in terms of virtual carrier sensing, the STA1 may determine the occupancy state of the channel using a network allocation vector (NAV) timer.
- NAV network allocation vector
- STA1 may transmit an RTS frame to STA2 after performing backoff when the channel is idle during DIFS.
- the STA2 may transmit a CTS frame, which is a response to the RTS frame, to the STA1.
- a NAV timer may be set for (eg, SIFS + CTS frame + SIFS + data frame + SIFS + ACK frame).
- STA3 uses the duration information included in the CTS frame to transmit frames continuously transmitted thereafter.
- a NAV timer may be set for a period (eg, SIFS + data frame + SIFS + ACK frame).
- STA3 may overhear one or more of RTS or CTS frames from one or more of STA1 or STA2, it may set the NAV accordingly.
- the STA3 may update the NAV timer using duration information included in the new frame. STA3 does not attempt channel access until the NAV timer expires.
- the STA1 may transmit the data frame to the STA2 after the SIFS from the point in time when the reception of the CTS frame is completed.
- the STA2 may transmit an ACK frame, which is a response to the data frame, to the STA1 after the SIFS.
- the STA3 may determine whether the channel is being used through carrier sensing. When the STA3 determines that the channel is not used by other terminals during DIFS after the expiration of the NAV timer, the STA3 may attempt channel access after a contention window (CW) due to random backoff passes.
- CW contention window
- FIG. 6 is a diagram for explaining an example of a frame structure used in a wireless LAN system to which the present disclosure can be applied.
- the PHY layer may prepare an MPDU (MAC PDU) to be transmitted. For example, when receiving a command requesting transmission start of the PHY layer from the MAC layer, the PHY layer switches to the transmission mode and configures information (eg, data) provided from the MAC layer in the form of a frame and transmits it. . In addition, when the PHY layer detects a valid preamble of a received frame, it monitors the header of the preamble and sends a command indicating the start of reception of the PHY layer to the MAC layer.
- MPDU MPDU
- PPDU PHY layer protocol data unit
- a basic PPDU frame may include a Short Training Field (STF), a Long Training Field (LTF), a SIGNAL (SIG) field, and a Data field.
- STF Short Training Field
- LTF Long Training Field
- SIG SIGNAL
- Data field e.g., Data field
- the most basic (eg, non-HT (High Throughput)) PPDU frame format may consist of only L-STF (Legacy-STF), L-LTF (Legacy-LTF), SIG field, and data field.
- the SIG field may be included (which will be described later with reference to FIG. 7 ).
- STF is a signal for signal detection, automatic gain control (AGC), diversity selection, precise time synchronization, etc.
- LTF is a signal for channel estimation, frequency error estimation, and the like. STF and LTF can be said to be signals for synchronization and channel estimation of the OFDM physical layer.
- the SIG field may include a RATE field and a LENGTH field.
- the RATE field may include information on modulation and coding rates of data.
- the LENGTH field may include information on the length of data. Additionally, the SIG field may include a parity bit, a SIG TAIL bit, and the like.
- the data field may include a SERVICE field, a Physical Layer Service Data Unit (PSDU), and a PPDU TAIL bit, and may also include a padding bit if necessary.
- Some bits of the SERVICE field may be used for synchronization of the descrambler at the receiving end.
- the PSDU corresponds to a MAC PDU defined in the MAC layer, and may include data generated/used in a higher layer.
- the PPDU TAIL bit may be used to return the encoder to a 0 state.
- the padding bit may be used to adjust the length of the data field to a predetermined unit.
- a MAC PDU is defined according to various MAC frame formats, and a basic MAC frame consists of a MAC header, a frame body, and a Frame Check Sequence (FCS).
- the MAC frame is composed of MAC PDUs and may be transmitted/received through the PSDU of the data part of the PPDU frame format.
- the MAC header includes a Frame Control field, a Duration/ID field, an Address field, and the like.
- the frame control field may include control information necessary for frame transmission/reception.
- the duration/ID field may be set to a time for transmitting a corresponding frame or the like.
- the null-data packet (NDP) frame format refers to a frame format that does not include a data packet. That is, the NDP frame includes a physical layer convergence procedure (PLCP) header part (ie, STF, LTF, and SIG fields) in the general PPDU frame format, and the remaining part (ie, data field) does not include a frame format. do.
- PLCP physical layer convergence procedure
- the NDP frame may be referred to as a short frame format.
- FIG. 7 is a diagram illustrating examples of a PPDU defined in the IEEE 802.11 standard to which the present disclosure can be applied.
- the basic PPDU format (IEEE 802.11a/g) includes L-LTF, L-STF, L-SIG and Data fields.
- the basic PPDU format may be referred to as a non-HT PPDU format.
- the HT PPDU format (IEEE 802.11n) additionally includes the HT-SIG, HT-STF, and HT-LFT(s) fields in the basic PPDU format.
- the HT PPDU format shown in FIG. 7 may be referred to as an HT-mixed format.
- HT-greenfield format PPDU may be defined, which does not include L-STF, L-LTF, L-SIG, HT-GF-STF, HT-LTF1, HT-SIG, one or more HT-LTF, Data Corresponds to a format composed of fields (not shown).
- VHT PPDU format (IEEE 802.11ac) includes VHT SIG-A, VHT-STF, VHT-LTF, and VHT-SIG-B fields in addition to the basic PPDU format.
- HE PPDU format IEEE 802.11ax
- RL-SIG Repeated L-SIG
- HE-SIG-A HE-SIG-B
- HE-STF HE-LTF(s)
- PE Packet Extension
- HE-SIG-B field is included in the HE PPDU format for multi-user (MU)
- HE-SIG-B is not included in the HE PPDU format for single user (SU).
- the HE trigger-based (TB) PPDU format does not include HE-SIG-B, and the length of the HE-STF field may be changed to 8us.
- the HE ER (Extended Range) SU PPDU format does not include the HE-SIG-B field, and the length of the HE-SIG-A field may vary by 16us.
- 8 to 10 are diagrams for explaining examples of resource units of a WLAN system to which the present disclosure can be applied.
- An RU may include a plurality of subcarriers (or tones). The RU may be used when transmitting a signal to multiple STAs based on the OFDMA technique. In addition, an RU may be defined even when a signal is transmitted to one STA. The RU may be used for the STF, LTF, data field, etc. of the PPDU.
- RUs corresponding to different numbers of tones are used, and some fields of a 20 MHz, 40 MHz, or 80 MHz X-PPDU (X is HE, EHT, etc.) configurable.
- resources may be allocated in units of RUs shown for the X-STF, X-LTF, and Data fields.
- FIG. 8 is a diagram illustrating an exemplary arrangement of a resource unit (RU) used on a 20 MHz band.
- RU resource unit
- 26-units ie, units corresponding to 26 tones
- Six tones may be used as a guard band in the leftmost band of the 20 MHz band, and 5 tones may be used as a guard band in the rightmost band of the 20 MHz band.
- 7 DC tones are inserted into the center band, that is, the DC band, and 26-units corresponding to each of 13 tones may exist on the left and right sides of the DC band.
- 26-units, 52-units, and 106-units may be allocated to other bands. Each unit may be allocated for a STA or a user.
- the RU arrangement of FIG. 8 is utilized not only in a situation for multiple users (MU), but also in a situation for a single user (SU), in this case using one 242-unit as shown at the bottom of FIG. 8 . it is possible In this case, three DC tones can be inserted.
- RUs of various sizes ie, 26-RU, 52-RU, 106-RU, 242-RU, and the like are exemplified, but the specific size of these RUs may be reduced or expanded. Accordingly, in the present disclosure, the specific size of each RU (ie, the number of corresponding tones) is not limiting but exemplary. In addition, within a predetermined bandwidth (eg, 20, 40, 80, 160, 320 MHz, ...) in the present disclosure, the number of RUs may vary depending on the RU size. The fact that the size and/or the number of RUs can be changed in the examples of FIGS. 9 and/or 10 described below is the same as the example of FIG. 8 .
- FIG. 9 is a diagram illustrating an exemplary arrangement of a resource unit (RU) used on a 40 MHz band.
- RU resource unit
- RUs of various sizes are used, in the example of FIG. 9, 26-RU, 52-RU, 106-RU, 242-RU, 484-RU, etc. may be used.
- 5 DC tones may be inserted into the center frequency, 12 tones are used as a guard band in the leftmost band of the 40 MHz band, and 11 tones are used in the rightmost band of the 40 MHz band. This can be used as a guard band.
- 484-RU when used for a single user, 484-RU may be used.
- FIG. 10 is a diagram illustrating an exemplary arrangement of a resource unit (RU) used on an 80 MHz band.
- RU resource unit
- RUs of various sizes are used, in the example of FIG. 10, 26-RU, 52-RU, 106-RU, 242-RU, 484-RU, 996-RU, etc. may be used. have.
- the RU arrangement of the HE PPDU and the EHT PPDU may be different, and the example of FIG. 10 shows an example of the RU arrangement for the 80 MHz EHT PPDU.
- 12 tones are used as a guard band in the leftmost band of the 80MHz band, and 11 tones are used as a guard band in the rightmost band of the 80MHz band.
- HE PPDU and EHT PPDU are used as a guard band in the leftmost band of the 80MHz band.
- the HE PPDU 7 DC tones are inserted in the DC band and one 26-RU corresponding to each 13 tones is present on the left and right sides of the DC band, whereas in the EHT PPDU, 23 DC tones are inserted in the DC band, There is one 26-RU on the left and right side of the DC band.
- the EHT PPDU 5 null subcarriers exist in the EHT PPDU.
- one 484-RU does not include a null subcarrier, but in the EHT PPDU, one 484-RU includes five null subcarriers.
- 996-RU when used for a single user, 996-RU may be used, and in this case, the insertion of 5 DC tones is common in the HE PPDU and the EHT PPDU.
- EHT PPDU of 160 MHz or higher may be set to a plurality of 80 MHz subblocks of FIG. 10 .
- the RU arrangement for each 80MHz subblock may be the same as the RU arrangement of the 80MHz EHT PPDU of FIG. 10 . If the 80MHz subblock of the 160MHz or 320MHz EHT PPDU is not punctured and the entire 80MHz subblock is used as a part of an RU or Multiple RU (MRU), the 80MHz subblock may use 996-RU of FIG. .
- MRU Multiple RU
- the MRU corresponds to a group of subcarriers (or tones) composed of a plurality of RUs, and the plurality of RUs constituting the MRU may be RUs of the same size or RUs of different sizes.
- a single MRU is 52+26-ton, 106+26-ton, 484+242-ton, 996+484-ton, 996+484+242-ton, 2 ⁇ 996+484-ton, 3 ⁇ 996-ton, or 3 ⁇ 996+484-ton.
- a plurality of RUs constituting one MRU may correspond to a small size (eg, 26, 52, 106) RU or a large size (eg, 242, 484, 996, etc.) RU.
- a small size eg, 26, 52, 106
- a large size eg, 242, 484, 996, etc.
- one MRU including a small size RU and a large size RU may not be configured/defined.
- a plurality of RUs constituting one MRU may or may not be continuous in the frequency domain.
- the 80MHz subblock may use RU deployments other than the 996-tone RU.
- the RU of the present disclosure may be used for uplink (UL) and/or downlink (DL) communication.
- an STA eg, an AP transmitting a trigger provides trigger information (eg, a trigger frame or triggered response scheduling (TRS)).
- trigger information eg, a trigger frame or triggered response scheduling (TRS)
- the first STA may transmit a first trigger-based (TB) PPDU based on the first RU
- the second STA may transmit a second TB PPDU based on the second RU.
- the first/second TB PPDU may be transmitted to the AP in the same time interval.
- the STA (eg, AP) transmitting the DL MU PPDU is the first RU (eg, 26/52/106/242-RU, etc.) to the first STA.
- a second RU eg, 26/52/106/242-RU, etc.
- the transmitting STA may transmit the HE-STF, HE-LTF, and Data fields for the first STA through the first RU within one MU PPDU, and the second through the second RU.
- HE-STF, HE-LTF, and Data fields for 2 STAs may be transmitted.
- Information on the arrangement of the RU may be signaled through HE-SIG-B of the HE PPDU format.
- FIG. 11 shows an exemplary structure of the HE-SIG-B field.
- the HE-SIG-B field may include a common field and a user-specific field.
- the common field may not be included in HE-SIG-B, and HE-SIG-B content A content channel may contain only user-specific fields.
- the common field may be included in HE-SIG-B.
- the common field may include information on RU allocation (eg, RU assignment, RUs allocated for MU-MIMO, number of MU-MIMO users (STA), etc.). .
- the common field may include N*8 RU allocation subfields.
- One 8-bit RU allocation subfield may indicate the size (26, 52, 106, etc.) and frequency location (or RU index) of RUs included in the 20 MHz band.
- the value of the 8-bit RU allocation subfield is 00000000
- nine 26-RUs are sequentially arranged from the leftmost to the rightmost in the example of FIG. 8, and if the value is 00000001, seven 26-RUs and 1 52-RUs are arranged in order from the leftmost to the right, and if the value is 00000010, five 26-RUs, one 52-RU, and two 26-RUs are arranged in order from the leftmost to the rightmost can indicate
- the value of the 8-bit RU allocation subfield is 01000y 2 y 1 y 0 , from the leftmost to the rightmost in the example of FIG. 8, one 106-RU and five 26-RUs are arranged in order.
- a plurality of users/STAs may be allocated to the 106-RU in the MU-MIMO scheme.
- a maximum of 8 users/STAs may be allocated to the 106-RU, and the number of users/STAs allocated to the 106-RU is determined based on 3-bit information (ie, y 2 y 1 y 0 ). For example, when 3-bit information (y 2 y 1 y 0 ) corresponds to a decimal value N, the number of users/STAs allocated to 106-RU may be N+1.
- one user/STA may be allocated to each of a plurality of RUs, and different users/STAs may be allocated to different RUs.
- a plurality of users/STAs may be allocated to one RU for an RU (eg, 106, 242, 484, 996-tone, ...) of a predetermined size or larger, and an MU for the plurality of users/STAs -MIMO method may be applied.
- the set of user-specific fields includes information on how all users (STAs) of the corresponding PPDU decode their own payload.
- a user-specific field may include zero or more user block fields.
- the non-final user block field includes two user fields (ie, information to be used for decoding in two STAs).
- the final user block field contains one or two user fields.
- the number of user fields may be indicated by the RU allocation subfield of HE-SIG-B, indicated by the number of symbols of HE-SIG-B, or indicated by the MU-MIMO user field of HE-SIG-A. have.
- User-specific fields may be encoded separately or independently of common fields.
- FIG. 12 is a diagram for describing an MU-MIMO scheme in which a plurality of users/STAs are allocated to one RU.
- one 106-RU and five 26-RUs may be sequentially arranged from the leftmost side to the rightmost side of a specific 20MHz band/channel. Three users/STAs may be allocated to the 106-RU in the MU-MIMO scheme.
- the user-specific field of HE-SIG-B may include 8 user fields (ie, 4 user block fields). Eight user fields may be assigned to an RU as shown in FIG. 12 .
- the user field may be configured based on two formats.
- a user field for MU-MIMO allocation may be configured in a first format
- a user field for non-MU-MIMO allocation may be configured in a second format.
- user fields 1 to 3 may be based on a first format
- user fields 4 to 8 may be based on a second format.
- the first format and the second format may include bit information of the same length (eg, 21 bits).
- the user field of the first format may be configured as follows. For example, among all 21 bits of one user field, B0-B10 includes identification information (eg, STA-ID, AID, partial AID, etc.) of the corresponding user, and B11-14 indicates the user's identification information. Includes spatial configuration information such as the number of spatial streams, B15-B18 includes MCS (Modulation and Coding Scheme) information applied to the Data field of the corresponding PPDU, and B19 is a reserved field. is defined, and B20 may include coding type (eg, binary convolutional coding (BCC) or low-density parity check (LDPC)) information applied to the Data field of the corresponding PPDU.
- BCC binary convolutional coding
- LDPC low-density parity check
- the user field of the second format (ie, the format for non-MU-MIMO allocation) may be configured as follows.
- B0-B10 includes identification information of the corresponding user (eg, STA-ID, AID, partial AID, etc.), and B11-13 is applied to the corresponding RU.
- B14 includes information indicating whether beamforming (or whether beamforming steering matrix is applied)
- B15-B18 includes MCS (Modulation and MCS) applied to the Data field of the corresponding PPDU.
- coding scheme information
- B19 includes information indicating whether dual carrier modulation (DCM) is applied
- B20 includes coding type (eg, BCC or LDPC) information applied to the Data field of the corresponding PPDU.
- DCM dual carrier modulation
- B20 includes coding type (eg, BCC or LDPC) information applied to the Data field of the corresponding PPDU.
- MCS MCS information
- MCS index MCS field, etc. used in the present disclosure may be indicated by a specific index value.
- MCS information may be indicated by index 0 to index 11.
- MCS information includes information about a constellation modulation type (eg, BPSK, QPSK, 16-QAM, 64-QAM, 256-QAM, 1024-QAM, etc.), and a coding rate (eg, 1/2, 2/ 3, 3/4, 5/6, etc.).
- a channel coding type eg, BCC or LDPC
- FIG. 13 shows an example of a PPDU format to which the present disclosure can be applied.
- the PPDU of FIG. 13 may be called by various names such as an EHT PPDU, a transmission PPDU, a reception PPDU, a first type or an Nth type PPDU.
- the PPDU or EHT PPDU of the present disclosure may be referred to by various names such as a transmission PPDU, a reception PPDU, a first type or an Nth type PPDU.
- the EHT PPU may be used in an EHT system and/or a new wireless LAN system in which the EHT system is improved.
- the EHT MU PPDU of FIG. 13 corresponds to a PPDU carrying one or more data (or PSDUs) for one or more users. That is, the EHT MU PPDU may be used for both SU transmission and MU transmission.
- the EHT MU PPDU may correspond to a PPDU for one receiving STA or a plurality of receiving STAs.
- the EHT-SIG is omitted compared to the EHT MU PPDU.
- the STA may perform UL transmission based on the EHT TB PPDU format.
- L-STF to EHT-LTF correspond to a preamble or a physical preamble, and may be generated/transmitted/received/obtained/decoded in the physical layer.
- Subcarrier frequency spacing of L-STF, L-LTF, L-SIG, RL-SIG, U-SIG (Universal SIGNAL), EHT-SIG field (these are called pre-EHT modulated fields) (subcarrier frequency spacing) may be set to 312.5kHz.
- a subcarrier frequency interval of the EHT-STF, EHT-LTF, Data, and PE fields (these are referred to as EHT modulated fields) may be set to 78.125 kHz.
- the tone/subcarrier index of the L-STF, L-LTF, L-SIG, RL-SIG, U-SIG, and EHT-SIG fields is expressed in units of 312.5 kHz
- EHT-STF, EHT-LTF, Data The tone/subcarrier index of the PE field may be expressed in units of 78.125 kHz.
- the L-LTF and L-STF of FIG. 13 may be configured in the same way as the corresponding fields of the PPDU described with reference to FIGS. 6 to 7 .
- the L-SIG field of FIG. 13 consists of 24 bits and may be used to communicate rate and length information.
- the L-SIG field includes a 4-bit Rate field, a 1-bit Reserved bit, a 12-bit Length field, a 1-bit Parity field, and a 6-bit tail. (Tail) field may be included.
- the 12-bit Length field may include information about the length or time duration of the PPDU.
- the value of the 12-bit Length field may be determined based on the type of the PPDU. For example, for a non-HT, HT, VHT, or EHT PPDU, the value of the Length field may be determined as a multiple of 3.
- the value of the Length field may be determined as a multiple of 3 + 1 or a multiple of 3 + 2.
- the transmitting STA may apply BCC encoding based on a coding rate of 1/2 to 24-bit information of the L-SIG field. Thereafter, the transmitting STA may obtain a 48-bit BCC encoding bit. BPSK modulation may be applied to 48-bit coded bits to generate 48 BPSK symbols. The transmitting STA transmits 48 BPSK symbols to the pilot subcarriers (eg, ⁇ subcarrier indexes -21, -7, +7, +21 ⁇ ) and DC subcarriers (eg, ⁇ subcarrier index 0 ⁇ ). Can be mapped to any location except .
- pilot subcarriers eg, ⁇ subcarrier indexes -21, -7, +7, +21 ⁇
- DC subcarriers eg, ⁇ subcarrier index 0 ⁇
- the transmitting STA may additionally map signals of ⁇ -1, -1, -1, 1 ⁇ to the subcarrier indexes ⁇ -28, -27, +27, +28 ⁇ .
- the above signal may be used for channel estimation in the frequency domain corresponding to ⁇ -28, -27, +27, +28 ⁇ .
- the transmitting STA may generate the RL-SIG generated in the same way as the L-SIG.
- BPSK modulation is applied.
- the receiving STA may know that the received PPDU is an HE PPDU or an EHT PPDU based on the existence of the RL-SIG.
- a U-SIG may be inserted after the RL-SIG of FIG. 13 .
- the U-SIG may be referred to by various names such as a first SIG field, a first SIG, a first type SIG, a control signal, a control signal field, and a first (type) control signal.
- the U-SIG may include information of N bits, and may include information for identifying the type of the EHT PPDU.
- the U-SIG may be configured based on two symbols (eg, two consecutive OFDM symbols).
- Each symbol (eg, OFDM symbol) for the U-SIG may have a duration of 4 us, and the U-SIG may have a total duration of 8 us.
- Each symbol of the U-SIG may be used to transmit 26-bit information.
- each symbol of the U-SIG may be transmitted/received based on 52 data tones and 4 pilot tones.
- a bit information (eg, 52 un-coded bits) may be transmitted, and the first symbol of the U-SIG (eg, U-SIG-1) transmits the first X-bit information (eg, 26 un-coded bits) of the total A-bit information, and the second symbol of the U-SIG (eg, U-SIG) -2) may transmit the remaining Y-bit information (eg, 26 un-coded bits) among the total A-bit information. For example, the transmitting STA may obtain 26 un-coded bits included in each U-SIG symbol.
- the transmitting STA may generate 52 BPSK symbols allocated to each U-SIG symbol by performing BPSK modulation on the interleaved 52-coded bits.
- One U-SIG symbol may be transmitted based on 56 tones (subcarriers) from subcarrier index -28 to subcarrier index +28, except for DC index 0.
- the 52 BPSK symbols generated by the transmitting STA may be transmitted based on the remaining tones (subcarriers) excluding pilot tones -21, -7, +7, and +21 tones.
- A-bit information (eg, 52 un-coded bits) transmitted by U-SIG includes a CRC field (eg, a 4-bit long field) and a tail field (eg, a 6-bit long field). ) may be included.
- the CRC field and the tail field may be transmitted through the second symbol of the U-SIG.
- the CRC field may be generated based on the remaining 16 bits excluding the CRC/tail field in the 26 bits allocated to the first symbol of the U-SIG and the second symbol, and may be generated based on a conventional CRC calculation algorithm.
- the tail field may be used to terminate a trellis of the convolutional decoder, and may be set to 0, for example.
- a bit information (eg, 52 un-coded bits) transmitted by the U-SIG (or U-SIG field) is to be divided into a version-independent bit and a version-dependent bit.
- the size of the version-independent bits may be fixed or variable.
- the version-independent bits may be allocated only to the first symbol of the U-SIG, or the version-independent bits may be allocated to both the first symbol and the second symbol of the U-SIG.
- the version-independent bits and the version-dependent bits may be referred to by various names such as a first control bit and a second control bit.
- the version-independent bits of the U-SIG may include a 3-bit physical layer version identifier (PHY version identifier).
- the 3-bit PHY version identifier may include information related to the PHY version of the transmission/reception PPDU.
- the first value of the 3-bit PHY version identifier may indicate that the transmission/reception PPDU is an EHT PPDU.
- the transmitting STA may set the 3-bit PHY version identifier to the first value.
- the receiving STA may determine that the receiving PPDU is an EHT PPDU based on the PHY version identifier having the first value.
- the version-independent bits of the U-SIG may include a 1-bit UL/DL flag field.
- a first value of the 1-bit UL/DL flag field relates to UL communication, and a second value of the UL/DL flag field relates to DL communication.
- the version-independent bits of the U-SIG may include information about the length of a transmission opportunity (TXOP) and information about a BSS color ID.
- TXOP transmission opportunity
- EHT PPDU when the EHT PPDU is divided into various types (eg, various types such as EHT PPDU related to SU mode, EHT PPDU related to MU mode, EHT PPDU related to TB mode, EHT PPDU related to Extended Range transmission) , information on the type of the EHT PPDU may be included in the version-dependent bits of the U-SIG.
- various types eg, various types such as EHT PPDU related to SU mode, EHT PPDU related to MU mode, EHT PPDU related to TB mode, EHT PPDU related to Extended Range transmission
- information on the type of the EHT PPDU may be included in the version-dependent bits of the U-SIG.
- the U-SIG is 1) a bandwidth field including information about bandwidth, 2) a field including information about an MCS technique applied to the EHT-SIG, 3) whether the DCM technique is applied to the EHT-SIG
- An indication field including information related to 4) a field including information on the number of symbols used for EHT-SIG, 5) a field including information on whether the EHT-SIG is generated over the entire band, 6) a field including information about the type of EHT-LTF/STF, 7) may include information about a field indicating the length of the EHT-LTF and the CP length.
- Preamble puncturing may be applied to the PPDU of FIG. 13 .
- the preamble puncturing refers to applying puncturing to some bands (eg, a secondary 20 MHz band) among all bands of the PPDU. For example, when an 80 MHz PPDU is transmitted, the STA applies puncturing to the secondary 20 MHz band among the 80 MHz band, and transmits the PPDU only through the primary 20 MHz band and the secondary 40 MHz band. have.
- the pattern of preamble puncturing may be set in advance. For example, when the first puncturing pattern is applied, puncturing may be applied only to the secondary 20 MHz band within the 80 MHz band. For example, when the second puncturing pattern is applied, puncturing may be applied only to any one of the two secondary 20 MHz bands included in the secondary 40 MHz band within the 80 MHz band. For example, when the third puncturing pattern is applied, puncturing may be applied only to the secondary 20 MHz band included in the primary 80 MHz band within the 160 MHz band (or 80+80 MHz band).
- the primary 40 MHz band included in the primary 80 MHz band within the 160 MHz band (or 80+80 MHz band) is present and does not belong to the primary 40 MHz band. Puncture may be applied to at least one 20 MHz channel that is not
- Information on preamble puncturing applied to the PPDU may be included in the U-SIG and/or the EHT-SIG.
- the first field of the U-SIG includes information about the contiguous bandwidth of the PPDU
- the second field of the U-SIG includes information about the preamble puncturing applied to the PPDU. have.
- U-SIG and EHT-SIG may include information about preamble puncturing based on the following method.
- the U-SIG may be individually configured in units of 80 MHz.
- the PPDU may include a first U-SIG for the first 80 MHz band and a second U-SIG for the second 80 MHz band.
- the first field of the first U-SIG includes information on the 160 MHz bandwidth
- the second field of the first U-SIG includes information on the preamble puncturing applied to the first 80 MHz band (that is, the preamble information about the puncturing pattern).
- the first field of the second U-SIG includes information about the 160 MHz bandwidth
- the second field of the second U-SIG includes information about the preamble puncturing applied to the second 80 MHz band (ie, preamble puncture). information about processing patterns).
- the EHT-SIG subsequent to the first U-SIG may include information about preamble puncturing applied to the second 80 MHz band (ie, information about the preamble puncturing pattern), and the EHT-SIG following the second U-SIG
- the EHT-SIG may include information about the preamble puncturing applied to the first 80 MHz band (ie, information about the preamble puncturing pattern).
- the U-SIG and the EHT-SIG may include information on preamble puncturing based on the following method.
- the U-SIG may include information on preamble puncturing for all bands (ie, information on preamble puncturing patterns). That is, the EHT-SIG does not include information about the preamble puncturing, and only the U-SIG may include information about the preamble puncturing (ie, information about the preamble puncturing pattern).
- the U-SIG may be configured in units of 20 MHz. For example, when an 80 MHz PPDU is configured, the U-SIG may be duplicated. That is, the same 4 U-SIGs may be included in the 80 MHz PPDU. PPDUs exceeding the 80 MHz bandwidth may include different U-SIGs.
- the EHT-SIG of FIG. 13 may include control information for the receiving STA.
- the EHT-SIG may be transmitted through at least one symbol, and one symbol may have a length of 4us. Information on the number of symbols used for the EHT-SIG may be included in the U-SIG.
- the EHT-SIG may include technical features of the HE-SIG-B described through FIGS. 11 to 12 .
- the EHT-SIG may include a common field and a user-specific field, as in the example of FIG. 8 .
- the common field of the EHT-SIG may be omitted, and the number of user-specific fields may be determined based on the number of users.
- the common field of the EHT-SIG and the user-specific field of the EHT-SIG may be coded separately.
- One User block field contained in a user-specific field contains information for two user fields, but the last user block field contained in a user-specific field is one or two user blocks. It can contain fields. That is, one user block field of the EHT-SIG may include a maximum of two user fields.
- each user field may be related to MU-MIMO assignment or may be related to non-MU-MIMO assignment.
- the common field of the EHT-SIG may include a CRC bit and a Tail bit
- the length of the CRC bit may be determined as 4 bits
- the length of the Tail bit may be determined as 6 bits and set to 000000.
- the common field of the EHT-SIG may include RU allocation information.
- the RU allocation information may refer to information about a location of an RU to which a plurality of users (ie, a plurality of receiving STAs) are allocated.
- RU allocation information may be configured in units of 8 bits (or N bits).
- a mode in which the common field of EHT-SIG is omitted may be supported.
- a mode in which the common field of the EHT-SIG is omitted may be referred to as a compressed mode.
- a plurality of users (ie, a plurality of receiving STAs) of the EHT PPDU may decode the PPDU (eg, a data field of the PPDU) based on non-OFDMA. That is, a plurality of users of the EHT PPDU may decode a PPDU (eg, a data field of the PPDU) received through the same frequency band.
- a plurality of users of the EHT PPDU may decode the PPDU (eg, a data field of the PPDU) based on OFDMA. That is, a plurality of users of the EHT PPDU may receive the PPDU (eg, a data field of the PPDU) through different frequency bands.
- the EHT-SIG may be configured based on various MCS techniques. As described above, information related to the MCS technique applied to the EHT-SIG may be included in the U-SIG.
- the EHT-SIG may be configured based on the DCM technique. For example, among the N data tones (eg, 52 data tones) allocated for the EHT-SIG, a first modulation scheme is applied to a continuous half tone, and a second modulation scheme is applied to the remaining consecutive half tones. technique can be applied. That is, the transmitting STA modulates specific control information into a first symbol based on the first modulation scheme and allocates to consecutive half tones, modulates the same control information to the second symbol based on the second modulation scheme, and modulates the remaining consecutive tones.
- N data tones eg, 52 data tones
- the EHT-STF of FIG. 13 may be used to improve automatic gain control (AGC) estimation in a MIMO environment or an OFDMA environment.
- the EHT-LTF of FIG. 13 may be used to estimate a channel in a MIMO environment or an OFDMA environment.
- Information on the type of STF and/or LTF may be included in the U-SIG field and/or the EHT-SIG field of FIG. 13 .
- GI guard interval
- the PPDU of FIG. 13 (ie, EHT PPDU) may be configured based on an example of the RU arrangement of FIGS. 8 to 10 .
- an EHT PPDU transmitted on a 20 MHz band may be configured based on the RU of FIG. 8 . That is, the location of the RU of the EHT-STF, EHT-LTF, and data field included in the EHT PPDU may be determined as shown in FIG. 8 .
- the EHT PPDU transmitted on the 40 MHz band, that is, the 40 MHz EHT PPDU may be configured based on the RU of FIG. 9 . That is, the location of the RU of the EHT-STF, EHT-LTF, and data field included in the EHT PPDU may be determined as shown in FIG. 9 .
- the EHT PPDU transmitted on the 80 MHz band may be configured based on the RU of FIG. 10 . That is, the location of the RU of the EHT-STF, EHT-LTF, and data field included in the EHT PPDU may be determined as shown in FIG. 10 .
- the tone-plan for 80 MHz of FIG. 10 may correspond to two repetitions of the tone-plan for 40 MHz of FIG. 9 .
- the tone-plan for 160/240/320 MHz may be configured in the form of repeating the pattern of FIG. 9 or FIG. 10 several times.
- the PPDU of FIG. 13 may be identified as an EHT PPDU based on the following method.
- the receiving STA may determine the type of the receiving PPDU as the EHT PPDU based on the following items. For example, 1) the first symbol after the L-LTF signal of the received PPDU is BPSK, 2) the RL-SIG in which the L-SIG of the received PPDU is repeated is detected, 3) the L- of the received PPDU When the result of applying the modulo 3 operation to the value of the Length field of the SIG (ie, the remainder after dividing by 3) is detected as 0, the received PPDU may be determined as an EHT PPDU.
- the receiving STA may determine the type of the EHT PPDU based on bit information included in the symbols after the RL-SIG of FIG. 13 .
- the receiving STA 1) the first symbol after the L-LTF signal which is BSPK, 2) the RL-SIG that is continuous to the L-SIG field and is the same as the L-SIG, and 3) the result of applying modulo 3 to 0
- the received PPDU may be determined as the EHT PPDU.
- the receiving STA may determine the type of the received PPDU as the HE PPDU based on the following items. For example, 1) the first symbol after the L-LTF signal is BPSK, 2) RL-SIG where L-SIG is repeated is detected, and 3) the result of applying modulo 3 to the L-SIG length value is When detected as 1 or 2, the received PPDU may be determined as an HE PPDU.
- the receiving STA may determine the type of the received PPDU as non-HT, HT, and VHT PPDU based on the following items. For example, if 1) the first symbol after the L-LTF signal is BPSK, and 2) RL-SIG in which the L-SIG is repeated is not detected, the received PPDU is determined to be a non-HT, HT and VHT PPDU. can In addition, even if the receiving STA detects repetition of the RL-SIG, if the result of applying modulo 3 to the L-SIG Length value is 0, the received PPDU may be determined as non-HT, HT and VHT PPDU. have.
- the PPDU of FIG. 13 may be used to transmit and receive various types of frames.
- the PPDU of FIG. 13 may be used for (simultaneous) transmission/reception of one or more of a control frame, a management frame, or a data frame.
- the HT control field may have a format as shown in Table 1 below.
- the HE variant HT control field may include an aggregated (A)-control subfield.
- the A-control subfield may include a control list bit of a variable length and zero or more padding bits.
- the control list may include one or more control subfields.
- One control subfield may include a 4-bit control ID and variable length control information.
- control ID value when the control ID value is 0, it means triggered response scheduling (TRS), and the control information subfield may have a size of 26 bits.
- control ID value when the control ID value is 1, it means operating mode (OM), and the control information subfield may have a size of 12 bits.
- TRS triggered response scheduling
- OM operating mode
- the U-SIG content is the same in both 20MHz subchannels.
- U-SIG content is the same in all non-punctured 20MHz subchannels.
- the U-SIG content is the same in all unpunctured 20 MHz sub-channels within each 80 MHz sub-block, and may be different from the U-SIG content in other 80 MHz sub-blocks. may be
- the U-SIG-1 part of the U-SIG of the EHT MU PPDU is the PHY version identifier (B0-B2), BW (B3-B5), UL/DL (B6), BSS color (B7-B12), and TXOP (B13).
- the U-SIG-2 part includes PPDU type and compression mode (B0-B1), validate (B2), punctured channel information (B3-B7) , validation (B8), EHT-SIG MCS (B9-B10), number of EHT-SIG symbols (B11-B15), CRC (B16-B19), and tails (B20-B25).
- 1 indicates an unpunctured subchannel
- x indicates a punctured subchannel.
- the puncturing granularity for the 80 MHz and 160 MHz PPDU bandwidths may be 20 MHz
- the puncturing unit size for the 320 MHz PPDU bandwidth may be 40 MHz.
- the U-SIG-1 part of the U-SIG of the EHT TB PPDU is the version identifier (B0-B2), BW (B3-B5), UL/DL (B6), BSS color (B7-B12), TXOP ( B13-B19), and disregard (B20-B25),
- the U-SIG-2 part is PPDU type and compression mode (B0-B1), validate (B2), space reuse 1 It may include (spatial reuse 1) (B3-B6), spatial reuse 2 (B7-B10), ignore (B11-B15), CRC (B16-B19), and tail (B20-B25).
- TXOP means a time interval in which a specific STA may have the right to start a frame exchange sequence on a wireless medium (WM).
- TXOP may be defined by a starting time (which may have a corresponding right) and a maximum duration value.
- the TXOP holder means a STA that has been granted TXOP by a hybrid coordinator (HC) or successfully competed for the TXOP. That is, the TXOP holder means an STA having the authority to perform a frame exchange sequence within the TXOP.
- a TXOP responder means a station that transmits a frame as a response to a frame received from a TXOP holder during a frame exchange sequence, but does not acquire a TXOP in the process.
- the bandwidth signaling TA (transmitter address) and transmission vector (TXVECTOR) parameters 'DYN_BANDWIDTH_IN_NON_HT' are 'DYNAMIC'
- the TXOP holder sets the TXVECTOR parameter 'CH_BANDWIDTH' of the PPDU as a reception vector (RXVECTOR) parameter of the CTS frame last received in the same TXOP. It can be set to be equal to or narrower than 'CH_BANDWIDTH_IN_NON_HT'.
- the TXOP holder may set the TXVECTOR parameter 'CH_BANDWIDTH' of the PPDU to be equal to or narrower than the TXVECTOR parameter 'CH_BANDWIDTH' of the RTS frame transmitted by the TXOP holder in the last RTS/CTS exchange in the same TXOP.
- the RU allocation subfield of the MU-RTS trigger frame for all intended receivers is MU- If it is the same as the value corresponding to the channel bandwidth indicated in the UL BW subfield in the common information field of the RTS trigger frame, the TXOP holder sets the TXVECTOR parameter 'CH_BANDWIDTH' of the PPDU to the last MU-RTS trigger/CTS in the same TXOP.
- the TXOP holder may set the TXVECTOR parameter 'CH_BANDWIDTH' of the PPDU to be equal to or narrower than the TXVECTOR parameter 'CH_BANDWIDTH' of the preceding PPDU transmitted in the same TXOP.
- TXOP includes at least one non-HT duplicate frame that does not include PS-Poll (Power Save-Poll)
- the TXOP holder sets the TXVECTOR parameter 'CH_BANDWIDTH' of the PPDU transmitted after the first non-HT duplicate frame other than the PS-Poll to the TXVECTOR parameter 'CH_BANDWIDTH' of the initial frame in the first non-HT duplicate frame of the same TXOP. It can be set equal or narrower.
- the TXOP holder transmits the TXVECTOR parameter 'CH_BANDWIDTH' of the non-initial PPDU in the same TXOP according to a condition (or constraint) to be described later. It can be set equal to or narrower than the TXVECTOR parameter 'CH_BANDWIDTH' of the preceding PPDU.
- the TXOP holder may set the TXVECTOR parameter 'CH_BANDWIDTH' of the non-initial PPDU to a value having a corresponding 20 MHz in the set of 20 MHz channels.
- the pre-HT modulation field of the preceding PPDU may be located in the set of 20 MHz channels.
- the TXOP holder may set the TXVECTOR parameter 'RU_ALLOCATION' of the non-initial PPDU to a value in which the corresponding RU is within the 20 MHz channel set.
- the pre-HT modulation field of the preceding PPDU may be located in the set of 20 MHz channels.
- the EHT STA may not perform a transmission operation through the punctured 20MHz subchannel as indicated in the TXVECTOR parameter 'INACTIVE_SUBCHANNEL'. That is, when the EHT STA transmits a control frame, a data frame, or a management frame in an EHT PPDU or a non-HT duplicate PPDU, the EHT STA may not perform a transmission operation on any punctured 20MHz subchannel.
- an indication of which subchannel was punctured in the non-HT duplicate PPDU or EHT PPDU may be transmitted from the MAC layer to the PHY layer through the TXVECTOR parameter 'INACTIVE_SUBCHANNEL'.
- the parameter 'INACTIVE_SUBCHANNEL' may be present in the TXVECTOR of a non-HT duplicate PPDU or EHT PPDU.
- the STA before the HE STA ie, the pre-HE STA
- the HE STA may transmit a punctured HE MU PPDU or may transmit an HE NDP or NDP announcement frame.
- the operation of the EHT STA in the EHT BSS may be controlled by at least one of an HT operation element, a VHT operation element, an HE operation element, or an EHT operation element.
- an HT operation element e.g., a VHT operation element, an HE operation element, or an EHT operation element.
- the EHT STA when it operates in the 6GHz band, it may obtain channel configuration information from the EHT operation element.
- the EHT operation element as shown in FIG. 14 , an element ID field, a length field, an Element ID extension field, an EHT operation information field, and a disabled subchannel bitmap ( disabled subchannel bitmap) field.
- the subfield of the EHT operation information field may be configured as shown in Table 3 below.
- Subfield definition Encoding Channel Width This subfield defines the EHT BSS bandwidth. Set to 0 for 20 MHz EHT BSS bandwidth. Set to 1 for 40 MHz EHT BSS bandwidth. Set to 2 for 80 MHz EHT BSS bandwidth. Set to 3 for 160 MHz EHT BSS bandwidth. Set to 4 for 320 MHz EHT BSS bandwidth. Other values are reserved.
- CCFS This subfield provides channel center frequency segment information for a 20, 40, 80, 160, or 320 MHz EHT BBS.
- Disabled Subchannel Bitmap Present This subfield indicates whether the Disabled Subchannel Bitmap field is present or not. Set to 1 if the Disabled Subchannel Bitmap field is present; set to 0 otherwise.
- the EHT operation information field may include a channel width subfield, a CCFS subfield, and a disabled subchannel bitmap present subfield.
- the channel width subfield may define an EHT BSS bandwidth (eg, 20, 40, 80, 160, 320 MHz, etc.).
- the CCFS subfield may provide channel center frequency segment information for the EHT BBS.
- the disabled subchannel bitmap presence subfield may indicate whether a disabled subchannel bitmap exists (in the EHT operation element).
- 'INACTIVE_SUBCHANNELS' of the EHT NDP declaration frame may be set based on a value indicated in the most recently disabled subchannel bitmap field on the EHT operation element.
- the EHT NDP declaration frame may not include 'INACTIVE_SUBCHANNELS' or 'Disallowed Subchannel Bitmap', unlike the HE NDP declaration frame.
- the EHT NDP declaration frame contains information related to a separate punctured subchannel (eg, 'INACTIVE_SUBCHANNELS' or 'Disallowed Subchannel Bitmap', etc.) may not be provided.
- the disabled subchannel bitmap field may provide a list of subchannels punctured within the BSS bandwidth.
- the Disabled Subchannel Bitmap field is a 16-bit bitmap in which the lowest numbered bit corresponds to a 20MHz subchannel, wherein the 20MHz subchannel is within the BSS bandwidth and is the lowest among all sets of 20MHz subchannels within the BSS bandwidth. can have a frequency.
- each successive bit of the bitmap may correspond to a next higher frequency 20 MHz subchannel.
- bitmap when a specific 20MHz subchannel is punctured, a bit corresponding to a specific 20MHz in the bitmap is set to 1, and when a specific 20MHz subchannel is not punctured, the bitmap corresponds to a specific 20MHz bit may be set to 0.
- the bit of the bitmap when exchanging a PPDU within the BSS (that is, when a subchannel is punctured), the bit of the bitmap may be set to 1 to indicate that energy is not transmitted in the corresponding subchannel. .
- the bit when a bit of the bitmap corresponds to a 20MHz subchannel within the BSS bandwidth that is not disabled (or not deactivated), the bit may be set to 0.
- the EHT operation element may be included in the management frame transmitted by the EHT AP, and the EHT AP may add a disabled subchannel bitmap to the EHT operation element.
- the EHT AP may set each bit of the disabled subchannel bitmap field to any value except for conditions to be described later.
- the bit of the bitmap corresponding to the 20MHz subchannel outside the BSS bandwidth shall be set to 1.
- bit of the bitmap corresponding to the primary 20MHz subchannel shall be set to 0.
- the EHT STA is the most recently exchanged disabled subchannel bitmap field in the EHT operation element for the corresponding BSS. Based on the indicated value, you can set the TXVECTOR parameter 'INACTIVE_SUBCHANNELS'.
- a corresponding bit in the TXVECTOR parameter 'INACTIVE_SUBCHANNELS' may be set to 1.
- the TXOP holder configures a resource area smaller than or equal to the resource area consisting of 20MHz channels occupied by the preceding PPDU for 'CH_BANDWIDTH' or 'RU_ALLOCATION', which are TXVECTOR parameters for non-initial PPDUs.
- the HE NDP declaration frame may provide information on the punctured subchannel by setting 'INACTIVE_SUBCHANNELS' or 'Disallowed Subchannel Bitmap' based on the STA information field having AID11 of 2047. However, there is a disabled subchannel bitmap indicating the punctured subchannel (unlike the HE operation element) in the EHT operation element provided through the management frame, and there is a separate puncturing sub-channel in the EHT NDP declaration frame. Channel-related information (eg, 'INACTIVE_SUBCHANNELS' or 'Disallowed Subchannel Bitmap', etc.) may not be included.
- the configuration of information on the punctured subchannel and the transmission operation based thereon can be set/defined more flexibly. Even in the recently developed WLAN system, the preamble puncture Since transmission of the processed PPDU is supported in earnest, overall definition and support of a method of transmitting a non-initial PPDU (ie, a response PPDU to the preceding PPDU) is required.
- a specific STA may transmit punctured channel information to another STA by defining 'INACTIVE_SUBCHANNELS' in a management frame (eg, a beacon frame).
- the other STA transmits in the remaining area except for the (preamble) punctured area among resource areas (eg, frequency unit, resource unit (RU), channel, sub-channel, etc.) allocated based on the punctured channel information.
- resource areas eg, frequency unit, resource unit (RU), channel, sub-channel, etc.
- the STA which is a TXOP holder, may allocate/indicate a resource area equal to or smaller than an area occupied by a preceding PPDU in a channel that is not preamble punctured for a non-initial PPDU. That is, the TXOP holder may allocate/indicate a resource unit smaller or smaller than a resource unit allocated for preceding PPDU transmission to a STA transmitting a non-initial PPDU.
- the STAs transmitting the non-initial PPDU are transmitted in the remaining channels (or frequency domains) except for the 20MHz subchannel in which transmission is impossible among the channels (or frequency domains) indicated by the TXOP holder.
- a method of performing this may be defined and supported. That is, a method in which the STA transmitting the non-initial PPDU selects one of the remaining subchannels except for the subchannel that cannot be transmitted from the allocated channel and transmits (ie, selective subchannel transmission) may be defined and supported.
- the TXOP holder may separately indicate to the STA transmitting the non-initial PPDU whether to allow the above-described scheme (ie, the selective subchannel transmission scheme). For example, the TXOP holder may transmit an optional subchannel of a non-initial PPDU through a newly defined subfield (eg, 1 bit) in an operation element of the preceding PPDU or an A-control subfield in the HT control field. Whether to allow or not may indicate to the STA transmitting the non-initial PPDU. Alternatively, the TXOP holder may transmit configuration information of one or more allowable preamble punctured subchannels to the STA transmitting the non-initial PPDU.
- a newly defined subfield eg, 1 bit
- the TXOP holder may transmit configuration information of one or more allowable preamble punctured subchannels to the STA transmitting the non-initial PPDU.
- 15 is a diagram for describing a PPDU transmission operation of a first STA according to an embodiment of the present disclosure.
- the first STA may receive the first PPDU from the second STA (S1510).
- the first STA may obtain information related to at least one first punctured resource unit (S1520).
- the resource unit may include at least one of a frequency unit, a resource unit (RU), a channel, or a subchannel.
- the at least one punctured resource unit may mean one or more subchannels punctured in units of 20 MHz, but is not limited thereto.
- the first STA may obtain information related to the at least one first punctured resource unit through the first PPDU received from the second STA. For example, the first STA may obtain information on the subchannel punctured in units of 20 MHz subchannels through the first PPDU.
- information related to at least one first punctured resource unit may be included in a specific field on the first PPDU.
- the first PPDU is based on an extremely high throughput (EHT) multi user (MU) PPDU format
- EHT extremely high throughput
- MU multi user
- information related to at least one first punctured resource unit is the first of the scrambling sequence of the service field of the first PPDU. ) can be included in 7 bits.
- the information related to the at least one first punctured resource unit is included in the HT-control field (or the A-control field newly defined on the HT-control field) included in the first PPDU.
- the first STA may transmit a second PPDU based on at least one second punctured resource unit to the second STA in response to the first PPDU (S1530).
- the at least one first punctured resource unit may be at least a portion of the at least one second punctured resource unit. That is, the at least one second punctured resource unit may be greater than or equal to the at least one first punctured resource unit.
- the resource unit occupied by the second PPDU ie, the PPDU corresponding to the preceding first PPDU
- the first STA may transmit information related to at least one second punctured resource unit to the second STA by including it in at least one of a second PPDU or a predetermined frame.
- the first STA performs the at least one second punctured resource unit before, after, or while transmitting the second PPDU based on the resource unit except for the at least one second punctured resource unit.
- Information related to the resource unit may be notified to the second STA.
- information related to at least one second punctured resource unit may be included in a specific field of the second PPDU.
- the first STA notifies the second STA of information related to the punctured resource unit currently applied to the second PPDU transmission.
- information related to at least one second punctured resource unit may be included in the U-SIG field of the second PPDU.
- information related to at least one second punctured resource unit may be included in the first 7 bits of the scrambling sequence of the service field of the second PPDU.
- the information related to the at least one second punctured resource unit may be included in the HT-control field (or the A-control field newly defined on the HT-control field) included in the second PPDU.
- the first STA notifies the second STA of information related to a punctured resource unit to be applied to future (PPDU) transmission.
- the predetermined frame includes at least one of a probe request frame and an association request frame.
- the predetermined frame includes capability information or HT control field included in the uplink frame. can do.
- the first STA may be a TXOP holder and the second STA may be a STA that transmits a non-initial PPDU. That is, the first PPDU transmitted by the second STA may be a non-initial PPDU.
- at least one of the first STA and the second STA may receive the disabled subchannel bitmap from the AP through a management frame (eg, a beacon frame, etc.).
- the disabled subchannel bitmap may include information related to a punctured resource unit (ie, at least one of at least one first or second punctured resource unit).
- the first STA which is the TXOP holder, may transmit information indicating whether to allow PPDU transmission based on at least one second punctured resource unit to the second STA. That is, the second STA may perform a transmission operation (eg, PPDU transmission) by selecting one or more subchannels except for one or more 20MHz subchannels that cannot be transmitted within the channel indicated by the first STA.
- a transmission operation eg, PPDU transmission
- the second STA may be a TXOP holder and the first STA may be a STA that transmits a non-initial PPDU.
- at least one of the first STA and the second STA may receive the disabled subchannel bitmap from the AP through a management frame (eg, a beacon frame, etc.).
- the second STA that is the TXOP holder may transmit information indicating whether to allow PPDU transmission based on at least one first punctured resource unit to the first STA.
- the first STA may be an STA performing a non-AP role and the second STA may be an STA performing an AP role.
- information related to the at least one first punctured resource unit may be provided to the first STA through the first PPDU or management frame.
- the first STA may receive information related to at least one first punctured resource unit from the second STA through a beacon frame in the first PPDU.
- 16 is a diagram for describing a PPDU transmission operation of a second STA according to an embodiment of the present disclosure.
- the second STA may transmit the first PPDU to the first STA (S1610).
- information related to the first punctured resource unit may be included in the first PPDU. Since information related to the first punctured resource unit included in the first PPDU has been described in detail with reference to FIG. 15 , a redundant description will be omitted. However, this is only an embodiment, and the second STA may transmit information related to the first punctured resource unit to the first STA through a separate frame (eg, a management frame, etc.).
- a separate frame eg, a management frame, etc.
- the second STA may receive a second PPDU based on at least one second punctured resource unit from the first STA in response to the first PPDU (S1620).
- the at least one first punctured resource unit may be at least a portion of the at least one second punctured resource unit. That is, the at least one second punctured resource unit may be greater than or equal to the at least one first punctured resource unit.
- the second STA may obtain information related to the second punctured resource unit through the second PPDU.
- the second STA may obtain information related to the second punctured resource unit through a separate frame from the first STA (or a separate STA).
- the first STA may be an STA performing a non-AP role and the second STA may be an STA performing an AP role.
- information related to the at least one first punctured resource unit may be provided to the first STA through a management frame in the first PPDU.
- the second STA may transmit information related to at least one first punctured resource unit to the first STA through a beacon frame in the first PPDU.
- the TXOP holder may identify punctured channel information based on 'INACTIVE_SUBCHANNELS' information.
- a specific STA eg, an STA serving as an AP
- a management frame eg, a beacon frame
- the TXOP holder may identify punctured channel information based on the received 'INACTIVE_SUBCHANNELS' information.
- the TXOP holder allocates an area equal to or smaller than the area occupied by the PPDU preceding the non-initial PPDU in the non-punctured channel for the non-initial PPDU (or for the STA transmitting the non-initial PPDU). /can be directed.
- 'INACTIVE_SUBCHANNELS' may be transmitted through a management frame (eg, a beacon frame), and it may be difficult to apply punctured channel information based on 'INACTIVE_SUBCHANNELS' differently whenever a transmission operation is performed.
- a management frame eg, a beacon frame
- An STA transmitting a non-initial PPDU may also announce 'INACTIVE_SUBCHANNELS' (or punctured channel information based on 'INACTIVE_SUBCHANNELS', etc.) to another STA initially or periodically.
- 'INACTIVE_SUBCHANNELS' or punctured channel information based on 'INACTIVE_SUBCHANNELS', etc.
- an STA transmitting a non-initial PPDU may increase radio resource utilization by notifying other STAs of information on a (preamble) punctured channel that cannot be transmitted.
- an STA transmitting a non-initial PPDU may notify other STAs of punctured channel information by transmitting 'INACTIVE_SUBCHANNELS' in a probe request frame/connection request frame. .
- the STA transmitting the non-initial PPDU transmits 'INACTIVE_SUBCHANNELS' in the capability information or HT control field of the uplink frame and transmits the punctured channel to another STA. information can be provided.
- the TXOP holder may allocate a resource region for the non-initial PPDU according to information notified by the STA transmitting the non-initial PPDU.
- the STA transmitting the TXOP holder/non-initial PPDU is the allocated resource. It can be expected that an inactive subchannel of the region is punctured and a (PPDU) transmission operation is performed. In consideration of this, the TXOP holder may decode the transmitted PPDU based on the remaining subchannels except for the subchannels that are not activated.
- An STA may transmit information about the punctured resource region in the PPDU to another STA. That is, information on the punctured resource region may be dynamically configured in the PPDU and transmitted to another STA.
- allocation information (eg, for the punctured resource region) in the U-SIG field in the preceding PPDU or/and non-initial PPDU information and/or information on a resource region allocated for PPDU transmission except for the punctured resource region, etc.) may be included.
- the U-SIG-2 part of the U-SIG field of the EHT MU PPDU format may include punctured channel information (B3-B7).
- the 5-bit punctured channel information indicates/sets a plurality of puncturing patterns, where 1 in each puncturing pattern represents an unpunctured subchannel, and x represents a punctured subchannel.
- At least one first punctured resource unit may be set/allocated to be equal to or smaller than the at least one first punctured resource unit. Accordingly, the number of x in the first puncturing pattern indicated by the punctured channel information of the U-SIG-2 part corresponding to the at least one first punctured resource unit is at least one second punctured resource unit.
- the punctured channel information of the U-SIG-2 part corresponding to the unit may be equal to or less than the number of x in the second puncturing pattern indicated by the unit. That is, x in the second puncturing pattern may include x in the first puncturing pattern, and may or may not include additional x.
- the bandwidth (bandwidth, In addition to BW) information puncturing information (eg, information on a punctured resource region and/or information on a resource region allocated for PPDU transmission excluding the punctured resource region, etc.) may be carried.
- a service field is included in the Data field in the PPDU, and the first 7 bits (or LSB 7 bits) among 16 bits of the service field correspond to the scrambling sequence. do.
- it may be predefined so that a specific bit value of the scrambling sequence is mapped to specific puncturing information.
- At least one first punctured sequence is performed in the first 7 bits (or LSB 7 bits) of the scrambling sequence of the service field included in the data field in the first PPDU.
- Information related to the resource unit is included (or mapped), and at least one second punctured resource unit and information are included in the first 7 bits of the scrambling sequence of the service field included in the data field in the second PPDU (or , can be mapped).
- a new A-control subfield is defined in the HT control field in the preceding PPDU or/and non-initial PPDU, and its (preamble) puncturing information (eg, punctured information on the resource region and/or information on the resource region allocated for PPDU transmission except for the punctured resource region, etc.) may be carried.
- preamble puncturing information eg, punctured information on the resource region and/or information on the resource region allocated for PPDU transmission except for the punctured resource region, etc.
- a new control ID for the A-control subfield is defined for the purpose of indicating puncturing information, and the bit size and content of the control information can be newly defined and used accordingly.
- the HT-control field included in each of at least one of the first PPDU and the second PPDU may include the A-control subfield.
- a new control ID may be defined for the purpose of indicating at least one first or second punctured resource unit, and the bit size and content of the control information may be newly defined and used accordingly.
- the TXOP holder (or a separate STA) may inform the STA transmitting the non-initial PPDU whether to allow selective subchannel transmission of the non-initial PPDU. If it is informed that selective subchannel transmission is allowed, the TXOP holder may request the STA transmitting the non-initial PPDU to inform information related to selective subchannel transmission of the non-initial PPDU.
- the STA transmitting the non-initial PPDU may transmit information related to selective subchannel transmission of the non-initial PPDU in the HT control field of the non-initial PPDU (eg, preamble puncturing). subchannel information or/and subchannel information that is not preamble punctured) may be notified to the TXOP holder or the like.
- the selective subchannel transmission of the non-initial PPDU may mean that the non-initial PPDU is transmitted in a specific subchannel except for a subchannel that cannot be transmitted in the channel indicated/allocated by the TXOP holder.
- the scope of the present disclosure includes software or machine-executable instructions (eg, operating system, application, firmware, program, etc.) that cause operation according to the method of various embodiments to be executed on a device or computer, and such software or and non-transitory computer-readable media in which instructions and the like are stored and executed on a device or computer.
- Instructions that can be used to program a processing system to perform features described in this disclosure may be stored on/in a storage medium or computer-readable storage medium, and can be viewed using a computer program product including such storage medium.
- Features described in the disclosure may be implemented.
- the storage medium may include, but is not limited to, high-speed random access memory such as DRAM, SRAM, DDR RAM or other random access solid state memory device, one or more magnetic disk storage devices, optical disk storage devices, flash memory devices, or may include non-volatile memory, such as other non-volatile solid state storage devices.
- the memory optionally includes one or more storage devices located remotely from the processor(s).
- the memory or alternatively the non-volatile memory device(s) within the memory includes a non-transitory computer-readable storage medium.
- Features described in this disclosure may be stored on any one of the machine readable media to control hardware of a processing system and cause the processing system to interact with other mechanisms that utilize results in accordance with embodiments of the present disclosure. It may be incorporated into software and/or firmware.
- Such software or firmware may include, but is not limited to, application code, device drivers, operating systems, and execution environments/containers.
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Abstract
Description
Subfield | Definition | Encoding |
Channel Width | This subfield defines the EHT BSS bandwidth. | Set to 0 for 20 MHz EHT BSS bandwidth. Set to 1 for 40 MHz EHT BSS bandwidth. Set to 2 for 80 MHz EHT BSS bandwidth. Set to 3 for 160 MHz EHT BSS bandwidth. Set to 4 for 320 MHz EHT BSS bandwidth. Other values are reserved. |
CCFS | This subfield provides channel center frequency segment information for a 20, 40, 80, 160, or 320 MHz EHT BBS. | |
Disabled Subchannel Bitmap Present | This subfield indicates whether the Disabled Subchannel Bitmap field is present or not. | Set to 1 if the Disabled Subchannel Bitmap field is present; set to 0 otherwise. |
Claims (15)
- 무선랜 시스템에서 제1 스테이션(station, STA)에 의해 통신을 수행하는 방법에 있어서, 상기 방법은:제2 STA로부터 제1 물리 계층 프로토콜 데이터 유닛(physical layer protocol data unit, PPDU)을 수신하는 단계;적어도 하나의 제1 펑처링된(punctured) 자원 유닛과 관련된 정보를 획득하는 단계; 및상기 제1 PPDU에 대응하여, 적어도 하나의 제2 펑처링된 자원 유닛에 기반한 제2 PPDU를 상기 제2 STA로 전송하는 단계를 포함하고,상기 적어도 하나의 제1 펑처링된 자원 유닛은 상기 적어도 하나의 제2 펑처링된 자원 유닛의 적어도 일 부분인, 방법.
- 제1항에 있어서,상기 적어도 하나의 제2 펑처링된 자원 유닛과 관련된 정보는 상기 제2 PPDU 또는 소정의 프레임 중의 적어도 하나에 포함되어 상기 제2 STA로 전송되는, 방법.
- 제2항에 있어서,상기 소정의 프레임은 프로브 요청 프레임(probe request frame) 또는 결합 요청 프레임(association request frame) 중의 적어도 하나를 포함하는, 방법.
- 제1항에 있어서,상기 제1 STA은 논(non)-AP(access point) STA이고,상기 제2 STA은 AP이고,상기 적어도 하나의 제1 펑처링된 자원 유닛과 관련된 정보는 상기 제1 PPDU 또는 관리 프레임(management frame)을 통해 상기 제1 STA로 전송되는, 방법.
- 제1항에 있어서,상기 제1 STA은 TXOP(transmission opportunity) 홀더(holder)이고,상기 제2 STA은 상기 비-초기(non-initial) PPDU를 전송하는 STA인. 방법.
- 제5항에 있어서,상기 제1 STA 또는 상기 제2 STA 중의 적어도 하나는 관리 프레임을 통해 디스에이블드 서브채널 비트맵(disabled subchannel bitmap)을 AP로부터 수신하고,상기 디스에이블드 서브채널 비트맵은 상기 제1 펑처링된 자원 유닛과 관련된 정보를 포함하는, 방법.
- 제5항에 있어서,상기 적어도 하나의 제2 펑처링된 자원 유닛에 기초한 PPDU 전송의 허용 여부를 지시하는 정보가 상기 제2 STA로 전송되는, 방법.
- 제1항에 있어서,상기 제1 PPDU 또는 상기 제2 PPDU 중의 적어도 하나가 EHT(extremely high throughput) MU (multi user) PPDU 포맷에 기반하고,상기 제1 PPDU 중 U(universal)-SIG(signal) 필드는 상기 적어도 하나의 제1 펑처링된 자원 유닛과 관련된 정보를 포함하고,상기 제2 PPDU 중 U-SIG 필드는 상기 적어도 하나의 제2 펑처링된 자원 유닛과 관련된 정보를 포함하는, 방법.
- 제1항에 있어서,상기 제1 PPDU 또는 상기 제2 PPDU 중의 적어도 하나가 논(non)-HT(high throughput) DUP(duplicate) 포맷에 기반하고,상기 제1 PPDU 중 서비스 필드(service field)의 스크램블링 시퀀스(scrambling sequence)의 첫 번째(first) 7 비트에 상기 적어도 하나의 제1 펑처링된 자원 유닛과 관련된 정보가 포함되고,상기 제2 PPDU 중 서비스 필드의 스크램블링 시퀀스의 첫 번째(first) 7 비트에 상기 적어도 하나의 제2 펑처링된 자원 유닛과 관련된 정보가 포함되는, 방법.
- 제1항에 있어서,상기 제1 PPDU 또는 상기 제2 PPDU 중의 적어도 하나 각각에 포함된 HT-제어(control) 필드에 상기 적어도 하나의 제1 펑처링된 자원 유닛 또는 상기 적어도 하나의 제2 펑처링된 자원 유닛이 포함되는, 방법.
- 무선랜 시스템에서 통신을 수행하는 제1 스테이션(station, STA)에 있어서, 상기 STA은:하나 이상의 송수신기; 및상기 하나 이상의 송수신기와 연결된 하나 이상의 프로세서를 포함하고,상기 하나 이상의 프로세서는:제2 STA로부터 제1 물리 계층 프로토콜 데이터 유닛(physical layer protocol data unit, PPDU)을 상기 하나 이상의 송수신기를 통해 수신하고;적어도 하나의 제1 펑처링된(punctured) 자원 유닛과 관련된 정보를 획득하고; 및상기 제1 PPDU에 대응하여, 적어도 하나의 제2 펑처링된 자원 유닛에 기반한 제2 PPDU를 상기 제2 STA로 상기 하나 이상의 송수신기를 통해 전송하도록 설정되고,상기 적어도 하나의 제1 펑처링된 자원 유닛은 상기 적어도 하나의 제2 펑처링된 자원 유닛의 적어도 일 부분인, 제1 STA.
- 무선랜 시스템에서 제2 스테이션(station, STA)에 의한 통신을 수행하는 방법에 있어서, 상기 방법은:제1 물리 계층 프로토콜 데이터 유닛(physical layer protocol data unit, PPDU)을 제1 STA로 전송하는 단계;상기 제1 PPDU에 대응하여 적어도 하나의 제2 펑처링된 자원 유닛에 기반한 제2 PPDU를 상기 제1 STA로부터 수신하는 단계를 포함하고,상기 적어도 하나의 제1 펑처링된 자원 유닛은 상기 적어도 하나의 제2 펑처링된 자원 유닛의 적어도 일 부분인, 방법.
- 무선랜 시스템에서 통신을 수행하는 제2 스테이션(station, STA)에 있어서, 상기 제2 STA는:하나 이상의 송수신기; 및상기 하나 이상의 송수신기와 연결된 하나 이상의 프로세서를 포함하고,상기 하나 이상의 프로세서는:제1 물리 계층 프로토콜 데이터 유닛(physical layer protocol data unit, PPDU)을 제1 STA로 상기 하나 이상의 송수신기를 통해 전송하고; 및상기 제1 PPDU에 대응하여 적어도 하나의 제2 펑처링된 자원 유닛에 기반한 제2 PPDU를 상기 제1 STA로부터 상기 하나 이상의 송수신기를 통해 수신하도록 설정되고,상기 적어도 하나의 제1 펑처링된 자원 유닛은 상기 적어도 하나의 제2 펑처링된 자원 유닛의 적어도 일 부분인, 제2 STA.
- 무선랜 시스템에서 통신을 수행하기 위해 제1 스테이션(station, STA)을 제어하도록 설정되는 프로세싱 장치에 있어서, 상기 프로세싱 장치는:하나 이상의 프로세서; 및상기 하나 이상의 프로세서에 동작 가능하게 연결되고, 상기 하나 이상의 프로세서에 의해 실행됨에 기반하여, 동작들을 수행하는 명령들을 저장하는 하나 이상의 컴퓨터 메모리를 포함하며,상기 동작들은:제2 STA로부터 제1 물리 계층 프로토콜 데이터 유닛(physical layer protocol data unit, PPDU)을 수신하는 동작;적어도 하나의 제1 펑처링된(punctured) 자원 유닛과 관련된 정보를 획득하는 동작; 및상기 제1 PPDU에 대응하여, 적어도 하나의 제2 펑처링된 자원 유닛에 기반한 제2 PPDU를 상기 제2 STA로 전송하는 동작을 포함하고,상기 적어도 하나의 제1 펑처링된 자원 유닛은 상기 적어도 하나의 제2 펑처링된 자원 유닛의 적어도 일 부분인, 프로세싱 장치.
- 하나 이상의 명령을 저장하는 하나 이상의 비-일시적(non-transitory) 컴퓨터 판독가능 매체로서,상기 하나 이상의 명령은 하나 이상의 프로세서에 의해서 실행되어, 무선랜 시스템에서 통신을 수행하는 장치가:제2 STA로부터 제1 물리 계층 프로토콜 데이터 유닛(physical layer protocol data unit, PPDU)을 수신하고;적어도 하나의 제1 펑처링된(punctured) 자원 유닛과 관련된 정보를 획득하고; 및상기 제1 PPDU에 대응하여, 적어도 하나의 제2 펑처링된 자원 유닛에 기반한 제2 PPDU를 상기 제2 STA로 전송하도록 제어하고,상기 적어도 하나의 제1 펑처링된 자원 유닛은 상기 적어도 하나의 제2 펑처링된 자원 유닛의 적어도 일 부분인, 컴퓨터 판독가능 매체.
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EP22788343.6A EP4325970A1 (en) | 2021-04-13 | 2022-04-07 | Transmission method and device based on preamble puncturing in wireless lan system |
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US20210083739A1 (en) * | 2015-11-25 | 2021-03-18 | Newracom, Inc. | Receiver address field for multi-user transmissions in wlan systems |
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US20210083739A1 (en) * | 2015-11-25 | 2021-03-18 | Newracom, Inc. | Receiver address field for multi-user transmissions in wlan systems |
WO2020221726A1 (en) * | 2019-04-30 | 2020-11-05 | Huawei Technologies Co., Ltd. | Device and method for non-contiguous multiple resource unit in a wireless network |
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