WO2016163639A1 - Procédé et appareil de protection de support dans un lan sans fil - Google Patents

Procédé et appareil de protection de support dans un lan sans fil Download PDF

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Publication number
WO2016163639A1
WO2016163639A1 PCT/KR2016/001555 KR2016001555W WO2016163639A1 WO 2016163639 A1 WO2016163639 A1 WO 2016163639A1 KR 2016001555 W KR2016001555 W KR 2016001555W WO 2016163639 A1 WO2016163639 A1 WO 2016163639A1
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Prior art keywords
frame
legacy
cts
ppdu
field
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PCT/KR2016/001555
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English (en)
Korean (ko)
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김서욱
류기선
천진영
조한규
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엘지전자 주식회사
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Publication of WO2016163639A1 publication Critical patent/WO2016163639A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/10—Small scale networks; Flat hierarchical networks
    • H04W84/12—WLAN [Wireless Local Area Networks]

Definitions

  • the present invention relates to wireless communication, and more particularly, to a method and apparatus for protecting a medium in a WLAN.
  • the channel bandwidth available in the existing WLAN system has been varied from 20MHz to 160MHz. Accordingly, determining an appropriate channel bandwidth for communication between the transmitting terminal (station (STA)) and the receiving terminal has become an important factor in determining the performance of the WLAN system.
  • STA station
  • a dynamic channel bandwidth setting protocol based on a request to send (RTS) frame and a clear to send (CTS) frame has been developed from IEEE 802.11ac.
  • RTS request to send
  • CTS clear to send
  • the transmitting terminal transmits the RTS frame to the receiving terminal before transmitting the data frame.
  • the destination terminal receiving the RTS frame responds to the transmitting terminal in the CTS frame.
  • the third terminals receiving the RTS frame and the CTS frame may delay the medium access for a predetermined time in order to protect data frames to be transmitted later.
  • a transmitting terminal transmits an RTS frame in a wide bandwidth exceeding a 20 MHz channel bandwidth, and a target terminal can respond to a CTS frame according to a channel bandwidth currently available to it. have. For example, if the transmitting terminal wants to use the 160MHz channel bandwidth, it transmits the RTS frame in 160MHz channel bandwidth. If the channel bandwidth currently available in the target terminal is 80MHz, the target terminal transmits the CTS frame in the 80MHz channel bandwidth.
  • a transmitting terminal transmitting an RTS frame receives a CTS frame with a channel bandwidth of 80 MHz, a data frame subsequently transmitted by the transmitting terminal to a target terminal should be less than or equal to an 80 MHz channel bandwidth.
  • An object of the present invention is to provide a medium protection method in a WLAN.
  • Still another object of the present invention is to provide an apparatus for performing a medium protection method in a WLAN.
  • an AP access point
  • CTS clear to send
  • PPDU physical layer protocol
  • PDUS data unit
  • pRTS physical layer request to send
  • the CTS-to-self PPDU may include receiving a legacy signal field that is decoded by the legacy STA to limit medium access of the legacy STA, and the pRTS PPDU may include a plurality of non-legacy STAs.
  • Each of the plurality of CTS frames may include a legacy signal field decoded by the legacy STA for restricting medium access of the legacy STA.
  • the AP is a radio frequency (RF) implemented to transmit or receive a radio signal
  • RF radio frequency
  • the processor transmits a clear to send (CTS) -to-self physical layer protocol data unit (PPDU) through a plurality of channels, Transmits a physical layer request to send (pRTS) PPDU in a non-legacy format through a channel of the receiver, receives a plurality of CTS frames from each of a plurality of target non-legacy STAs through the plurality of channels, A plurality of data frames are transmitted to each of the plurality of target non-legacy STAs based on downlink (DL) multiple user (MU) orthogonal frequency division multiple access (OFDMA) transmission through a channel.
  • CTS clear to send
  • PPDU physical layer protocol data unit
  • pRTS physical layer request to send
  • a plurality of data frames are transmitted to each of the plurality of target non-legacy STAs based on downlink (DL) multiple user (MU) orthogonal frequency
  • ACK acknowledgment
  • CTS-to-self PPDU is configured to restrict media access of the legacy STA.
  • a legacy signal field decoded by a legacy STA wherein the pRTS PPDU is configured to restrict media access of remaining non-legacy STAs except for the plurality of target non-legacy STAs to receive the plurality of data frames among a plurality of non-legacy STAs.
  • each of the plurality of CTS frames includes a legacy signal field decoded by the legacy STA for restricting medium access of the legacy STA. It may include.
  • a medium protection procedure may be performed based on a transmission procedure of a physical layer request to send (pRTS) frame and a clear to send (CTS) frame before transmission of downlink frames for a plurality of STAs. Therefore, the possibility of collision between frames can be reduced and WLAN transmission efficiency can be increased.
  • pRTS physical layer request to send
  • CTS clear to send
  • WLAN wireless local area network
  • FIG. 2 is a conceptual diagram illustrating a method of using an RTS frame and a CTS frame to solve a hidden node issue and an exposed node issue.
  • FIG. 3 is a conceptual diagram illustrating an A-MSDU.
  • FIG. 4 is a conceptual diagram illustrating an A-MPDU.
  • FIG. 6 is a conceptual diagram illustrating a DL MU OFDMA transmission method based on medium protection according to an embodiment of the present invention.
  • FIG. 7 is a conceptual diagram illustrating a DL MU OFDMA transmission method based on medium protection according to an embodiment of the present invention.
  • FIG. 8 is a conceptual diagram illustrating a DL MU OFDMA transmission method based on medium protection according to an embodiment of the present invention.
  • FIG. 9 is a conceptual diagram illustrating a DL MU OFDMA transmission method based on medium protection according to an embodiment of the present invention.
  • FIG. 10 is a conceptual diagram illustrating a DL MU PPDU format according to an embodiment of the present invention.
  • FIG. 11 is a conceptual diagram illustrating an RTS frame format according to an embodiment of the present invention.
  • FIG. 12 is a conceptual diagram illustrating a PPDU for delivering an RTS frame according to an embodiment of the present invention.
  • FIG. 13 is a conceptual diagram illustrating a method of transmitting downlink data based on DL MU OFDMA transmission according to an embodiment of the present invention.
  • FIG. 14 is a conceptual diagram illustrating a method of transmitting downlink data based on DL MU OFDMA transmission according to an embodiment of the present invention.
  • 15 is a conceptual diagram illustrating a method of transmitting downlink data based on DL MU OFDMA transmission according to an embodiment of the present invention.
  • 16 is a conceptual diagram illustrating a method of transmitting downlink data based on DL MU OFDMA transmission according to an embodiment of the present invention.
  • 17 is a conceptual diagram illustrating a method of transmitting downlink data based on DL MU OFDMA transmission according to an embodiment of the present invention.
  • FIG. 18 is a conceptual diagram illustrating a method of transmitting downlink data based on DL MU OFDMA transmission according to an embodiment of the present invention.
  • FIG. 19 is a block diagram illustrating a wireless device to which an embodiment of the present invention can be applied.
  • WLAN wireless local area network
  • BSS infrastructure basic service set
  • IEEE Institute of Electrical and Electronic Engineers
  • the WLAN system may include one or more infrastructure BSSs 100 and 105 (hereinafter, BSS).
  • BSSs 100 and 105 are a set of APs and STAs such as an access point 125 and a STA1 (station 100-1) capable of successfully synchronizing and communicating with each other, and do not indicate a specific area.
  • the BSS 105 may include one or more joinable STAs 105-1 and 105-2 to one AP 130.
  • the BSS may include at least one STA, APs 125 and 130 for providing a distribution service, and a distribution system (DS) 110 for connecting a plurality of APs.
  • STA STA
  • APs 125 and 130 for providing a distribution service
  • DS distribution system
  • the distributed system 110 may connect several BSSs 100 and 105 to implement an extended service set (ESS) 140 which is an extended service set.
  • ESS 140 may be used as a term indicating one network in which one or several APs 125 and 230 are connected through the distributed system 110.
  • APs included in one ESS 140 may have the same service set identification (SSID).
  • the portal 120 may serve as a bridge for connecting the WLAN network (IEEE 802.11) with another network (for example, 802.X).
  • a network between the APs 125 and 130 and a network between the APs 125 and 130 and the STAs 100-1, 105-1 and 105-2 may be implemented. However, it may be possible to perform communication by setting up a network even between STAs without the APs 125 and 130.
  • a network that performs communication by establishing a network even between STAs without APs 125 and 130 is defined as an ad-hoc network or an independent basic service set (BSS).
  • FIG. 1 is a conceptual diagram illustrating an IBSS.
  • the IBSS is a BSS operating in an ad-hoc mode. Since IBSS does not contain an AP, there is no centralized management entity. That is, in the IBSS, the STAs 150-1, 150-2, 150-3, 155-4, and 155-5 are managed in a distributed manner. In the IBSS, all STAs 150-1, 150-2, 150-3, 155-4, and 155-5 may be mobile STAs, and access to a distributed system is not allowed, thus making a self-contained network. network).
  • a STA is any functional medium that includes medium access control (MAC) conforming to the Institute of Electrical and Electronics Engineers (IEEE) 802.11 standard and a physical layer interface to a wireless medium. May be used to mean both an AP and a non-AP STA (Non-AP Station).
  • MAC medium access control
  • IEEE Institute of Electrical and Electronics Engineers
  • the STA may include a mobile terminal, a wireless device, a wireless transmit / receive unit (WTRU), a user equipment (UE), a mobile station (MS), a mobile subscriber unit ( It may also be called various names such as a mobile subscriber unit or simply a user.
  • WTRU wireless transmit / receive unit
  • UE user equipment
  • MS mobile station
  • UE mobile subscriber unit
  • It may also be called various names such as a mobile subscriber unit or simply a user.
  • An access point (AP) operating in a wireless local area network (WLAN) system may transmit data through the same time resource to each of a plurality of stations (STAs). If the transmission from the AP to the STA is called downlink transmission, the transmission to each of the plurality of STAs of the AP may be expressed in terms of downlink multi-user transmission (or downlink multi-user transmission).
  • FIG. 2 is a conceptual diagram illustrating a method of using an RTS frame and a CTS frame to solve a hidden node issue and an exposed node issue.
  • a short signal transmission frame such as a request to send (RTS) frame and a clear to send (CTS) frame to solve a hidden node issue and an exposed node issue ( short signaling frame) may be used.
  • the neighboring STAs may know whether to transmit or receive data between the two STAs based on the RTS frame and the CTS frame.
  • FIG. 2A illustrates a method of transmitting the RTS frame 203 and the CTS frame 205 to solve a hidden node issue.
  • both STA A 200 and STA C 220 attempt to transmit a data frame to STA B 210.
  • the STA A 200 may transmit the RTS frame 203 to the STA B 210 before transmitting the data frame, and the STA B 210 may transmit the CTS frame 205 to the STA A 200.
  • STA C 220 may overhear the CTS frame 205 and may know transmission of the frame from STA A 200 to STA B 210 over the medium.
  • the STA C 220 may set a network allocation vector (NAV) until the transmission of the data frame from the STA A 200 to the STA B 210 ends.
  • NAV network allocation vector
  • FIG. 2B illustrates a method of transmitting the RTS frame 233 and the CTS frame 235 to solve the exposed node issue.
  • STA C 250 determines whether there is a collision when transmitting a frame to another STA D 260 based on the monitoring of the RTS frame 233 and the CTS frame 235 of STA A 230 and STA B 240. Can be.
  • STA B 240 may transmit an RTS frame 233 to STA A 230, and STA A 230 may transmit a CTS frame 235 to STA B 240.
  • STA C 250 overhears only the RTS frame 233 transmitted by STA B 240 and fails to overhear the CTS frame 235 transmitted by STA A 230. Accordingly, STA C 250 may know that STA A 230 is outside the carrier sensing range of STA C 250. Accordingly, STA C 250 may transmit data to STA D 260.
  • the RTS frame format and the CTS frame format are disclosed in 8.3.1.2 RTS frame format and 8.3.1.3 CTS frame format of IEEE P802.11-REVmc TM / D2.0, October 2013.
  • FIG. 3 is a conceptual diagram illustrating an A-MSDU.
  • the MAC service data unit (MSDU) 300 generated at the application layer for aggregation of data frames may be aggregated at an upper layer of the MAC layer and generated as one MSDU.
  • the MSDU aggregated in the upper layer of the MAC layer may be defined in the term A-MSDU (aggregate-MSDU) 350.
  • the A-MSDU 350 may be generated based on aggregation of a plurality of MSDUs 300 having the same priority and having the same receiver address (RA).
  • Each MSDU 300 may include a subframe header consisting of a destination address (DA), a source address (SA), and an MSDU length.
  • the A-MSDU subframe can be padded to make the entire length of the A-MSDU subframe a constant multiple (multiple of 4 octets).
  • a plurality of A-MSDU subframes may be gathered to form one A-MSDU 350.
  • the A-MSDU 350 may be formed and transmitted as a single QoS data MAC protocol data unit (MPDU) without performing fragmentation unlike a single MSDU.
  • the A-MSDU 350 may transmit only when the HT capability of the management information base (MIB) field is TRUE, that is, HT STA, and may be transmitted only to the HT STA.
  • MIB management information base
  • the A-MSDU 350 has the capability of de-aggregating the HT STA, and the HT STA determines whether the A-MSDU 350 is present in the QoS field of the MAC header of the received QoS data. You can check and perform the deaggregation.
  • the A-MSDU 300 may not be aggregated into the A-MPDU.
  • whether the A-MSDU 300 can be aggregated into the A-MPDU may vary depending on whether a block acknowledgment agreement for each traffic identifier (TID) is made. Also, even when a block ACK agreement is made for the TID, the A-MSDU block ACK support indicator of the ADDBA acknowledgment response frame according to the ADDBA request frame adds a block ACK. If not indicated, A-MSDU may not be included in A-MPDU.
  • TID traffic identifier
  • FIG. 4 is a conceptual diagram illustrating an A-MPDU.
  • one A-MPDU 450 may be formed by collecting a plurality of MPDUs 400 having the same receiver address (RA), a TID, and an ACK policy under the MAC layer.
  • the A-MPDU 450 is composed of one or more A-MPDU subframes, and each A-MPDU subframe may include an MPDU delimiter and an MPDU 400.
  • the MPDU delimiter may be used to determine whether an error occurs in the A-MPDU subframe constituting the A-MPDU 450.
  • the plurality of A-MPDU subframes may form one A-MPDU 450.
  • Successful reception of the A-MPDU 450 may be indicated based on the block ACK.
  • the A-MPDU 450 may be formed only for the TID having the HT-immediate BA agreement, and the duration / ID field of the MPDU 400 constituting the A-MPDU 450 may be set. The value can be set equally.
  • the block ACK mechanism was introduced to transmit a response frame at a time that includes ACK information for a plurality of frames transmitted during the TXOP period.
  • the efficiency of the MAC layer can be improved due to the reduction of overhead as with the A-MSDU or A-MPDU.
  • block ACK transmission for an A-MPDU of one TID may be performed based on a setup process, a transmission process, and a tear down process.
  • the setting process may be a process of requesting and responding to a block ACK session.
  • the transmitting STA (hereinafter referred to as the transmitting side) transmits the continuous data to the receiving STA (hereinafter referred to as the receiving side), and the receiving STA transmits an aggregated response to the transmitting data. It may transmit to the STA.
  • a block ACK session established in a tear down process may be released.
  • the transmitting side may transmit an add block acknowledgment (ADDBA) request frame to the receiving side, and the receiving side may transmit an ADDBA response frame to the transmitting side.
  • the transmitting side may transmit an ADDBA request frame, which is a management frame, to the receiving side.
  • the ADDBA request frame may request a block ACK agreement for the current TID.
  • the ADDBA request frame may transmit information on a block ACK policy type, a transmission buffer size of a transmitting side, a timeout value of a block ACK session, a starting sequence number (SSN), etc. to a receiving side.
  • the receiving side receiving the ADDBA request frame may transmit the ADDBA response frame to the transmitting side in response to the ADDBA request frame.
  • the ADDBA response frame may include a block ACK agreement state, an ACK policy, a buffer size, and a timeout value.
  • the transmitting side may transmit the A-MPDU to the receiving side.
  • the transmitting side may transmit the BAR frame to the receiving side. If the transmitting side of the A-MPDU is successful, the receiving side receiving the BAR frame may transmit a block ACK for the A-MPDU to the transmitting side.
  • BAR block ack request
  • the release process may be performed when the set timeout value of an inactivity timer set on the transmitting side and the receiving side expires or there is no more data to transmit for the corresponding TID.
  • a delete block acknowledgment (DELBA) frame may be transmitted to the receiving side or the transmitting side according to the expiration of the set timeout value of the stop timer, and the block ACK session may be terminated.
  • the transmitting side receives the block ACK
  • the stopping timer of the transmitting side may be reset.
  • the receiving side receives the MPDU, the block ACK request frame, the stop timer of the receiving side may be reset.
  • An AP operating in a WLAN system may transmit data to a plurality of STAs through the same time resource. If the transmission from the AP to the STA is called downlink transmission, the transmission of such an AP may be expressed in terms of DL MU transmission (or downlink multi-user transmission).
  • the AP may perform DL MU transmission based on MU multiple input multiple output (MUMI), and this transmission may be expressed by the term DL MU MIMO transmission.
  • MUMI MU multiple input multiple output
  • the AP may perform DL MU transmission based on orthogonal frequency division multiplexing access (OFDMA), and this transmission may be expressed by the term DL MU OFDMA transmission.
  • OFDMA orthogonal frequency division multiplexing access
  • the AP may transmit downlink data (or downlink frame) to each of the plurality of STAs through each of the plurality of frequency resources on the overlapped time resources.
  • Each of the physical layer downlink data units (PPDUs), frames, and data transmitted through downlink transmission may be expressed in terms of a downlink PPDU, a downlink frame, and downlink data.
  • the PPDU may be a data unit including a PPDU header and a physical layer service data unit (PSDU) (or MAC protocol data unit (MPDU)).
  • PSDU physical layer service data unit
  • MPDU MAC protocol data unit
  • the PPDU header may include a PHY header and a PHY preamble
  • the PSDU (or MPDU) may include or indicate a frame.
  • DL single user (SU) transmission may indicate downlink transmission from the AP to one STA on the entire transmission resource.
  • transmission from an STA to an AP may be referred to as an uplink transmission, and transmission of data from a plurality of STAs to an AP on the same time resource is called UL MU transmission (or uplink multi-user transmission).
  • UL MU transmission or uplink multi-user transmission
  • a UL MU transmission may be supported in a WLAN system according to an embodiment of the present invention.
  • Each of the PPDUs, frames, and data transmitted through the uplink may be represented by the term uplink PPDU, uplink frame, and uplink data.
  • Uplink transmission by each of the plurality of STAs may be performed in a frequency domain or a spatial domain.
  • different frequency resources may be allocated as uplink transmission resources for each of the plurality of STAs based on orthogonal frequency division multiplexing (OFDMA).
  • OFDMA orthogonal frequency division multiplexing
  • Each of the plurality of STAs may transmit an uplink frame to the AP through different allocated frequency resources.
  • the transmission method through these different frequency resources may be represented by the term UL MU OFDMA transmission method.
  • the uplink frame may be transmitted to the AP through another space-time stream.
  • the transmission method through these different spatial streams may be represented by the term UL MU MIMO transmission method.
  • the UL SU transmission may indicate downlink transmission from one STA to one AP on all transmission resources.
  • a transmission and reception procedure of an RTS frame and a CTS frame for protecting a medium before transmission of a downlink frame based on DL MU OFDMA transmission is disclosed.
  • a primary channel and a secondary channel having bandwidths of the same size are assumed.
  • a primary channel and a secondary channel each including a plurality of subbands which are frequency resources for DL MU OFDMA-based transmission, are assumed.
  • Each of the plurality of subbands may be used for transmission of downlink data to a specific STA.
  • each of the 20 MHz primary channel and the 20 MHz secondary channel may include four 5 MHz subbands.
  • the primary channel may be defined in other sizes, such as 20 MHz, 40 MHz, and 80 MHz
  • the secondary channel may be defined in other sizes, such as 20 MHz, 40 MHz, and 80 MHz
  • the size of the subband may be defined as another size such as 10MHz, 2.5MHz, etc., not 5MHz.
  • the AP may perform the following procedure for transmission of data through the primary channel and the secondary channel.
  • the STA may perform a back off procedure in the primary channel and obtain a right for channel access on the primary channel.
  • the STA may determine whether additional channel bands (eg, secondary channels) are available.
  • the AP may check the channel state of the secondary channel in a point coordination function (PCF) interframe space (PIFS) period before the back-off timer expires.
  • PCF point coordination function
  • PIFS interframe space
  • the secondary channel may be the remaining channels except the primary channel among all available channel bands.
  • the secondary channel may be expressed in other terms as non-primary channel.
  • the AP may determine the state of the channel during PIFS before transmission opportunity (TXOP) to determine whether the secondary channel is idle or busy. If the secondary channel is idle during PIFS, the STA may determine that the state of the secondary channel is idle.
  • TXOP transmission opportunity
  • the primary channel and the secondary channel are available.
  • the primary channel may also be expressed in terms of a first channel and a secondary channel.
  • subband (or division) is arbitrary. That is, the available total frequency resources are divided in various ways, and the divided total frequency resources may be used for transmission of downlink data (or downlink frames) based on DL MU OFDMA of the AP.
  • FIG. 6 is a conceptual diagram illustrating a DL MU OFDMA transmission method based on medium protection according to an embodiment of the present invention.
  • the AP may transmit each of the plurality of RTS frames 600 and 610 on the overlapped time resources through each of the plurality of channels.
  • the AP may transmit the RTS frame 1 600 and the RTS frame 2 610 through the primary channel and the secondary channel, respectively.
  • Each of the plurality of RTS frames transmitted through each of the plurality of channels may include information about a target STA to receive downlink data on each transport channel of each of the plurality of RTS frames and / or information about downlink resources for the target STA. Can be.
  • the RTS frame 1 600 transmitted through the primary channel by the AP may include identification information and / or information about each of at least one target STA that will receive downlink data transmitted by the AP through the primary channel. It may include information about downlink resources allocated for transmission of downlink data to each of the at least one target STA.
  • the RTS frame 2 610 transmitted by the AP through the secondary channel may include identification information and / or at least one target for each of at least one target STA to receive downlink data transmitted by the AP through the secondary channel.
  • Each STA may include information on downlink resources allocated for transmission of downlink data.
  • each of the plurality of RTS frames transmitted by the AP through each of the plurality of channels is downlink data through a plurality of subbands included in the transmission channel through which the RTS frame is transmitted among the plurality of channels. It may include identification information of at least one target STA and / or information about downlink resources allocated to at least one target STA for transmission of downlink data.
  • downlink resources allocated to at least one target STA for transmission of downlink data may be expressed by a term called target STA allocation resource (or target STA allocation subband).
  • a receiving address (RA) field of an RTS frame transmitted through each of a plurality of channels is a target to receive (or receive an RTS frame) downlink data through a target STA allocated subband included in a transmission channel of the RTS frame. It may include information about the STA.
  • the RA field or another separate resource allocation field included in the RTS frame may include information on the target STA allocation subband.
  • the PPDU header of the RTS PPDU carrying the RTS frame may include identification information of the target STA and information on the target STA allocation subband.
  • the RA field of the RTS frame 1 600 transmitted through the primary channel is an identifier (eg, MAC address, AID) of each of STA1 and STA2 which are target STAs to receive downlink data through the primary channel. (association identifier) and information about a partial association identifier (PAID).
  • the RA field (or resource allocation field) of the RTS frame 1 600 may include information on subbands (or frequency resources) allocated to each of STA1 and STA2 as information on target STA allocation subbands. .
  • the RA field (or resource allocation field) of the RTS frame 1 600 is two subbands of the four subbands included in the primary channel are allocated to STA1 for transmission of downlink data, and the remaining two subbands are allocated.
  • the subband may be allocated to STA2 for transmission of downlink data.
  • the RA field of the RTS frame 2 610 transmitted through the secondary channel is information about an identifier (eg, MAC address, AID, PAID) of each of STA3 and STA4, which are target STAs to receive downlink data through the secondary channel. It may include.
  • the RA field (or resource allocation field) of the RTS frame 2 610 may include information about resources (or subbands) allocated to each of the STA3 and the STA4 as the information on the target STA allocation resource.
  • the RA field (or resource allocation field) of the RTS frame 2 610 has three subbands of four subbands included in the secondary channel allocated to STA3 for transmission of downlink data, and the other one subband. The band may be allocated to STA4 for transmission of downlink data.
  • each of the plurality of RTS frames (or RTS PPDUs) transmitted through each of the plurality of channels may be transmitted on each transport channel of each of the plurality of RTS frames (or RTS PPDUs), but the plurality of channels (eg, The RTS frame may be transmitted through one RTS PPDU on the entire transmission resource including the primary channel and the secondary channel.
  • One RTS PPPDU for transmitting an RTS frame may be a DL MU PPDU format to be described later.
  • the DL MU PPDU format may include a PPDU header including duplicated (or duplicated) fields.
  • all target STAs to receive a downlink frame are indicated on all transmission resources, and frequency resources for receiving downlink data of each target STA are indicated. Can be indicated.
  • identification information of all target STAs eg, STA1, STA2, STA3, and STA4 in which a PPDU header of one RTS PPDU operates on all transmission resources and some target STAs (STA1, STA2) among all target STAs ) May include information about the allocated frequency resources (primary channel) and the remaining frequency resources (secondary channel) for the remaining target STAs STA3 and STA4.
  • STA1 and STA2 may receive an RTS frame transmitted through the primary channel based on the PPDU header information
  • STA3 and STA4 may receive an RTS frame transmitted through the secondary channel based on the PPDU header information.
  • only one target STA of the plurality of target STAs that has received the RTS frame transmitted through one of the plurality of channels may transmit the CTS frame to the AP in response to the RTS frame.
  • the remaining target STAs may not transmit the CTS frame to the AP.
  • one target STA that transmits a CTS frame in response to the RTS frame may be expressed by the term CTS frame transmission STA.
  • CTS frame transmission STA may transmit the CTS frame to the AP through the same channel as the transmission channel of the RTS frame.
  • one of the plurality of target STAs STA1 and STA2 that has received the RTS frame1 600 through the primary channel may transmit the CTS frame1 620 to the AP through the primary channel.
  • One of the plurality of target STAs STA3 and STA4 that have received the RTS frame2 610 through the secondary channel may transmit the CTS frame2 630 to the AP through the secondary channel.
  • the CTS frame transmission STA may be determined based on various methods.
  • the CTS frame transmission STA may be determined based on the RA field included in the RTS frame.
  • the CTS frame transmission STA may be the STA indicated first in order among the plurality of target STAs indicated on the basis of the RA field included in the RTS frame.
  • the plurality of bits included in the RA field may sequentially indicate the plurality of target STAs, and the CTS frame transmitting STA is based on the first located (or decoded) bit among the plurality of bits included in the RA field. It may be a target STA indicated by.
  • the CTS frame transmission STA may be a target STA that is first decoded and identified when decoding the RA field.
  • the RA field of the RTS frame1 600 transmitted through the primary channel may sequentially include an identifier of STA1 and an identifier of STA2.
  • the STA1 indicated first based on the RA field among the STA1 and the STA2 may be a CTS frame transmission STA.
  • Each of STA1 and STA2 may decode the RA field of the RTS frame1 600 and determine whether to transmit the CTS frame based on the decoding result.
  • STA1 may determine the transmission of the CTS frame1 based on the RA field, and STA2 may determine the non-transmission of the CTS frame based on the RA field.
  • STA1, which is a CTS frame transmission STA may transmit the CTS frame1 620 to the AP through the primary channel.
  • the RA field of the RTS frame 2 transmitted through the secondary channel may sequentially include an identifier of STA3 and an identifier of STA4.
  • the STA3 indicated first based on the RA field among the STA3 and the STA4 may be a CTS frame transmission STA.
  • Each of the STA3 and the STA4 may decode the RA field of the RTS frame 2 610 and determine whether to transmit the CTS frame based on the decoding result.
  • STA3 may determine the transmission of the CTS frame based on the RA field, and STA4 may determine the non-transmission of the CTS frame based on the RA field.
  • STA3, which is a CTS frame transmission STA may transmit the CTS frame 2 630 to the AP through the secondary channel.
  • RTS frame2 610 as a response to the CTS frame1 620 and the RTS frame2 610 transmitted by STA1 within a predetermined time after reception of the RTS frame1 600 as a response to the RTS frame1 600.
  • the CTS frame 2 630 transmitted by the STA3 within a predetermined time after the reception of the UE may be transmitted to the AP on the overlapped time resource.
  • the CTS frame 1 620 and the CTS frame 2 630 may be frames including the same information.
  • the CTS frame 1 620 and the CTS frame 2 630 may be transmitted within a decodable range to the AP without collision between frames.
  • the CTS frame transmission STA may be determined based on the size of the allocated subband (or resource). A method of determining a CTS frame transmission STA based on the size of the allocated subband (or resource) will be described later.
  • the CTS frame transmission STA may be randomly determined by the AP or the STA.
  • the AP may transmit downlink data to each of the plurality of target STAs through a plurality of channels (or subbands included in each of the plurality of channels).
  • the AP may transmit downlink data to each of the plurality of target STAs through the target STA allocation subband indicated based on the RTS frame.
  • the downlink data may be carried through a PPDU based on a PPDU format or a DL MU PPDU format, which will be described later.
  • the AP may transmit downlink data for STA1 to STA1 through two of the four subbands included in the primary channel, and transmit downlink data for STA2 to STA2 through the remaining two subbands.
  • the AP may transmit downlink data for STA3 to STA3 through three of the four subbands included in the secondary channel, and transmit downlink data for STA4 to STA4 through the remaining one subband.
  • the AP may transmit each of a plurality of downlink PPDUs including at least one downlink frame (or downlink data for at least one target STA) through each of the plurality of channels.
  • the downlink data 640 transmitted by the AP to STA1 and STA2 based on the DL MU OFDMA through the primary channel is transmitted based on the downlink PPDU1 and transmitted to the STA3 and STA4 based on the DL MU OFDMA.
  • the downlink data 650 may be transmitted based on the downlink PPDU2.
  • Each of the downlink PPDU1 and the downlink PPDU2 may be a data unit generated based on each IFFT process.
  • the PPDU header of the downlink PPDU1 includes identification information of the target STAs STA1 and STA2 to receive the downlink data 640 through the subbands included in the transmission channel of the downlink PPDU1, and the subbands allocated to the target STAs STA1 and STA2. It may include information about.
  • the PPDU header of the downlink PPDU2 includes identification information of the target STAs STA3 and STA4 to receive the downlink data 650 through the subbands included in the transmission channel of the downlink PPDU2 and the subbands assigned to the target STAs STA3 and STA4. It may include information about.
  • the AP may transmit one PPDU of a DL MU PPDU format including downlink data 640 and 650 for STA1, STA2, STA3, and STA4 through a primary channel and a secondary channel based on DL MU OFDMA.
  • one PPDU of a DL MU PPDU format generated based on a single IFFT process on a plurality of channels is downlinked to a target STA through a plurality of channels.
  • Link data 640 and 650 may be transmitted.
  • the PPDU header of one PPDU of the DL MU PPDU format generated based on a single IFFT process on a plurality of channels may be used to identify target STAs STA1, STA2, STA3, and STA4 that will receive downlink data 640 and 650 on the plurality of channels.
  • the identification information and subbands included in the plurality of channels may include information on subbands allocated to STA1, STA2, STA3, and STA4, which are target STAs.
  • the downlink frame 1 and the downlink data 650 transmitted to the STA3 and the STA4 through the secondary channel include the downlink data 640 transmitted to the STA1 and the STA2 through the primary channel. It is assumed a case of transmitting a downlink frame 2 including a).
  • a method of transmitting a block ACK frame for downlink data of a plurality of target STAs is disclosed. It is assumed that a plurality of target STAs succeed in decoding downlink data transmitted by the AP and transmit a block ACK frame to the AP.
  • Each of the plurality of target STAs may transmit a block ACK frame to the AP through the same frequency resource as the transmission channel (receive channel) of the RTS frame.
  • STA1 and STA2 that have received the RTS frame1 600 through the primary channel may transmit a block ACK frame to the AP through the primary channel.
  • STA3 and STA4 that have received the RTS frame2 610 through the secondary channel can transmit a block ACK frame to the AP through the secondary channel.
  • one of the plurality of target STAs When the plurality of target STAs need to transmit a block ACK frame through the same frequency resource as the transmission channel of the RTS frame, one of the plurality of target STAs receives a separate frame (for example, after receiving downlink data from the AP).
  • a block ACK frame can be immediately transmitted without triggering by a block acknowledgment request (BAR) frame.
  • BAR block acknowledgment request
  • the remaining target STAs among the plurality of target STAs may transmit a block ACK frame to the AP after receiving the BAR frame from the AP.
  • the plurality of target STAs STA1 and STA2 may receive the RTS frame1 600 through the primary channel.
  • STA1 which is one of STA1 and STA2
  • the remaining STA, STA2 may receive downlink data from the AP through subbands included in the primary channel, receive a BAR frame 665 from the AP, and transmit a block ACK frame2 670 to the AP through the primary channel. have.
  • a plurality of target STAs STA3 and STA4 may receive the RTS frame 2 610 through the secondary channel.
  • STA3, which is one of STA3 and STA4 may transmit the block ACK frame 3 680 to the AP immediately after receiving downlink data from the AP through the subband included in the secondary channel.
  • the remaining STA, STA4 may receive the BAR frame 685 from the AP after receiving downlink data through the subband included in the secondary channel from the AP, and transmit the block ACK frame 4 690 to the AP through the secondary channel.
  • An STA that transmits a block ACK frame immediately after receiving downlink data from an AP may be expressed in terms of a block ACK transmitting STA (immediate BACK sender) immediately. Immediate block ACK transmission STA may be determined based on various methods.
  • Immediate block ACK transmission STA may be determined based on the RA field included in the RTS frame.
  • the immediate block ACK transmission STA may be the first indicated STA among the plurality of STAs indicated based on the RA field included in the RTS frame.
  • the bits of the RA field of the RTS frame1 600 transmitted through the primary channel may sequentially indicate an identifier of STA1 and an identifier of STA2.
  • the STA1 indicated first based on the RA field among the STA1 and the STA2 may be an immediate block ACK transmission STA.
  • Each of STA1 and STA2 may decode the RA field of the RTS frame1 600 and determine whether to transmit a block ACK immediately after receiving downlink data or immediately after receiving a BAR frame based on the decoding result. have.
  • STA1 which is an immediate block ACK transmission STA, may directly transmit the block ACK frame 1 660 to the AP through a primary channel after receiving downlink data included in the downlink frame 1 640.
  • Immediate Block ACK Transmission STA2 that is not an STA may receive the BAR frame 665 and transmit the block ACK frame 2 670 directly to the AP through the primary channel.
  • the RA field of the RTS frame 2 610 transmitted through the secondary channel may sequentially include an identifier of STA3 and an identifier of STA4.
  • the STA3 first indicated based on the RA field among the STA3 and the STA4 may be an immediate block ACK transmission STA.
  • Each of the STA3 and the STA4 decodes the RA field of the RTS frame 2 610 and transmits the block ACK3 immediately after receiving the downlink data included in the downlink frame 2 650 based on the decoding result, or a BAR frame ( It may be determined whether to transmit immediately after the reception of 685).
  • STA3 which is an immediate block ACK transmission STA, may immediately transmit block ACK frame 3 680 to the AP through the secondary channel after receiving downlink data.
  • Immediate Block ACK Transmission STA4 not the STA, may receive the BAR frame 685 and immediately transmit the block ACK frame 4 690 to the AP via the secondary channel.
  • the immediate block ACK transmission STA may be determined based on the size of the allocated subband. Referring to the secondary channel of FIG. 6, since three subbands are allocated to STA3 among four subbands included in the secondary channel, STA3 may be immediately determined to be a block ACK transmission STA. Alternatively, the block ACK transmission STA may be randomly determined by the AP or the STA.
  • subband allocation for the target STA for limiting the transmission procedure of the BAR frame and the block ACK frame based on the BAR frame only in the secondary channel may be performed.
  • the AP receives the downlink data through the secondary channel and the number of target STAs receiving the downlink data through the primary channel for limiting the procedure of transmitting the BAR frame and the block ACK frame based on the BAR frame only in the secondary channel. It may be determined to be larger than the number of target STAs. In this case, the transmission procedure of the block ACK frame through the primary channel may be performed longer than the transmission procedure of the block ACK frame through the secondary channel.
  • the clear channel assessment level (or CCA threshold) used to determine whether the secondary channel is only idle or busy may be greater than the CCA level used to determine whether the primary channel is idle or busy.
  • the non-target STA except for the target STA may relatively easily determine that the secondary channel is idle, and the possibility of collision between frames transmitted on the secondary may be relatively large. Therefore, in order to reduce the collision of the frame, the transmission or reception procedure of the block ACK frame through the secondary channel may be set to end faster than the transmission or reception procedure of the block ACK frame through the primary channel. Based on this method, the overall WLAN transmission efficiency can be increased.
  • FIG. 7 is a conceptual diagram illustrating a DL MU OFDMA transmission method based on medium protection according to an embodiment of the present invention.
  • FIG. 7 after a media protection procedure based on an RTS frame and a CTS frame, transmission of DL MU OFDMA-based downlink data of an AP through a primary channel and a secondary channel is started.
  • FIG. 7 discloses a method in which an AP allocates more target STAs to a primary channel.
  • the AP may transmit each of the plurality of RTS frames on the overlapped time resources through each of the plurality of channels.
  • the AP may transmit each of the RTS frame 1 700 and the RTS frame 2 710 on the primary channel and the secondary channel, respectively.
  • each of the plurality of RTS frames transmitted by the AP through each of the plurality of channels is downlink data through a plurality of subbands included in the transmission channel of the RTS frame among the plurality of channels. It may include identification information of at least one target STA to receive the information and information on the target STA allocation subband allocated to the at least one target STA for transmission of the downlink data.
  • the RA field of the RTS frame 1 700 transmitted through the primary channel may include information on identifiers of each of STA1 and STA2 which are target STAs to receive downlink data through the primary channel.
  • the RA field (or resource allocation field) of the RTS frame 1 700 may include information on the subbands allocated to each of the STA1 and the STA2 as the information on the target STA allocation resource.
  • the RA field (or resource allocation field) of the RTS frame 1 700 includes two subbands out of four subbands included in the primary channel allocated to STA1 for transmission of downlink data, and two remaining subbands. The subband may be allocated to STA2 for transmission of downlink data.
  • the RA field of the RTS frame 2 710 transmitted through the secondary channel may include information on an identifier of STA3, which is a target STA to receive downlink data through the secondary channel.
  • the RA field (or resource allocation field) of the RTS frame 2 710 may include information about a resource (or subband) allocated for STA3 as information on the target STA allocation resource.
  • the RA field (or resource allocation field) of the RTS frame 2 710 may indicate that four of the four subbands included in the secondary channel are allocated to STA3 for transmission of downlink data. .
  • the AP may allocate more target STAs relative to the primary channel.
  • target STA allocation subbands of two target STAs are allocated on a primary channel and target STAs of the other target STA.
  • the allocation subbands can be allocated on the secondary channel.
  • the transmission or reception procedure of the block ACK frame through the secondary channel may be set to end faster than the transmission or reception procedure of the block ACK frame through the primary channel. Therefore, as described above, collision of frames may be reduced, thereby increasing WLAN efficiency.
  • the plurality of target STAs may transmit a block ACK frame to the AP through the same frequency resource as the transmission channel of the RTS frame.
  • the STA1 and the STA2 that have received the RTS frame1 700 through the primary channel may transmit the block ACK frame1 760 to the AP through the primary channel.
  • STA1 may be an immediate block ACK transmission STA.
  • STA2 may receive the BAR frame 770 from the AP and transmit a block ACK frame 2 780 to the AP.
  • the STA3 may transmit the block ACK frame 3 790 to the AP through the secondary channel immediately after receiving downlink data from the AP through the subband included in the secondary channel.
  • the number of target STAs receiving downlink data on the secondary channel May be greater than the number of target STAs receiving downlink data on the primary channel.
  • FIG. 8 is a conceptual diagram illustrating a DL MU OFDMA transmission method based on medium protection according to an embodiment of the present invention.
  • FIG. 8 discloses a case in which subbands included in each of the plurality of channels are allocated as target STA allocation resources for STA1.
  • the AP may transmit downlink data to STA1 through a primary channel and downlink data to STA1 and STA2 through a secondary channel.
  • the AP may transmit each of the plurality of RTS frames on the overlapped time resources through each of the plurality of channels.
  • the AP may transmit the RTS frame 1 and the RTS frame 2 through the primary channel and the secondary channel, respectively.
  • the RA field of the RTS frame 1 800 transmitted through the primary channel may include information about an identifier of STA1 which is a target STA to receive downlink data through the primary channel.
  • the RA field (or resource allocation field) of the RTS frame 1 800 may include information on a subband (or resource) allocated for STA1 as information on a target STA allocation resource.
  • the RA field (or resource allocation field) of the RTS frame 1 800 may indicate that four of the four subbands included in the primary channel are allocated to STA1 for transmission of downlink data. have.
  • the RA field of the RTS frame 2 810 transmitted through the secondary channel may include information on identifiers of STA1 and STA2 which are target STAs to receive downlink data through the secondary channel.
  • the RA field (or resource allocation field) of the RTS frame 2 810 may include information on subbands (or resources) allocated to STA1 and STA2 as information on target STA allocation resources.
  • the RA field (or resource allocation field) of the RTS frame 2 810 is one of four subbands included in the secondary channel is allocated to STA1 for transmission of downlink data and the remaining three subbands. The band may be allocated to STA2 for transmission of downlink data.
  • the STA1 may transmit the CTS frame through the primary channel and the secondary channel.
  • the STA1 may transmit the CTS PPDU1 820 including the CTS frame through the primary channel and the CTS PPDU2 830 including the CTS frame through the secondary channel.
  • CTS PPDU1 and CTS PPDU2 may be generated based on separate IFFTs.
  • the STA1 may transmit one CTS PPDU including the CTS frame through the primary channel and the secondary channel.
  • the AP may receive the CTS frame through the primary channel and the secondary channel and transmit downlink data to the STA1 and the STA2 through the primary channel and the secondary channel.
  • STA1 receives downlink data 840 and 850 transmitted by the AP through subbands allocated for STA1 included in each of the primary channel and the secondary channel, and STA2 receives subbands assigned to STA2 included in the secondary channel.
  • the downlink data 855 transmitted by the AP may be received.
  • STA1 which is an immediate block ACK transmission STA, transmits the block ACK PPDU1 860 including the block ACK frame 1 860 through the primary channel in response to the downlink data 840 received through the primary channel.
  • the block ACK PPDU1 including the block ACK frame 1 ′ 870 may be transmitted through the secondary channel.
  • Block ACK frame 1 860 may include ACK information for downlink data received through the primary channel.
  • the block ACK frame 1 '870 may include ACK information for downlink data received through the secondary channel.
  • the block ACK PPDU1 and the block ACK PPDU1 ' may be generated based on separate IFFTs.
  • STA1 may transmit one block ACK PPDU including a block ACK frame on the primary channel and the secondary channel.
  • One block ACK PPDU transmitted on the primary channel and the secondary channel may be generated and transmitted based on a single IFFT.
  • the block ACK frame included in one block ACK PPDU may include ACK information about downlink data received through the primary channel and downlink data received through the secondary channel.
  • Immediate Block ACK Transmission STA2 may receive the BAR frame 880 from the AP and transmit the block ACK frame 2 890 to the AP in response to the BAR frame 880.
  • the STA may receive downlink data through a plurality of channels and transmit a block ACK frame for downlink data received through the plurality of channels through one channel to the AP.
  • FIG. 9 is a conceptual diagram illustrating a DL MU OFDMA transmission method based on medium protection according to an embodiment of the present invention.
  • FIG. 9 illustrates a method in which an STA receives downlink data through a plurality of channels and transmits a block ACK frame for downlink data received through a plurality of channels through one channel to the AP.
  • the STA1 may receive downlink data through subbands included in the primary channel and the secondary channel as shown in FIG. 8.
  • the STA2 may receive downlink data through the subbands included in the secondary channel.
  • the STA1 may transmit block ACK frame1 910 (or block ACK PPDU including block ACK frame1) for downlink data.
  • the block ACK frame 1 910 transmitted by the STA1 through the primary channel corresponds to downlink data 900 transmitted to the STA1 through the primary channel and downlink data 920 transmitted to the STA1 through the secondary channel. It may include ACK information.
  • the block ACK frame transmitted by the STA1 through a specific channel may include ACK information about downlink data transmitted through another channel as well as the specific channel.
  • the block ACK frame1 transmitted through the primary channel by STA1 may include ACK information about downlink data received through the primary channel and downlink data received through the secondary channel.
  • the STA2 may transmit a block ACK frame 2 940 including the ACK information about the downlink data 930 received through the secondary channel to the AP through the secondary channel.
  • FIG. 10 is a conceptual diagram illustrating a DL MU PPDU format according to an embodiment of the present invention.
  • FIG. 10 illustrates a DL MU PPDU format transmitted based on DL MU OFDMA by an AP according to an embodiment of the present invention.
  • the PPDU header of the DL MU PPDU includes a legacy-short training field (L-STF), a legacy-long training field (L-LTF), a legacy-signal (L-SIG), and a HE-SIG A (high).
  • the above-described RTS frame, downlink data frame, etc. may be transmitted through the data field.
  • From the PPDU header to the L-SIG may be divided into a legacy part and a high efficiency (HE) part after the L-SIG.
  • HE high efficiency
  • the L-STF 1000 may include a short training orthogonal frequency division multiplexing symbol.
  • the L-STF 1000 may be used for frame detection, automatic gain control (AGC), diversity detection, and coarse frequency / time synchronization.
  • AGC automatic gain control
  • the L-LTF 1010 may include a long training orthogonal frequency division multiplexing symbol.
  • the L-LTF 1010 may be used for fine frequency / time synchronization and channel prediction.
  • L-SIG 1020 may be used to transmit control information.
  • the L-SIG 1020 may include information about a data rate and a data length.
  • the HE-SIG A 1030 may include information for indicating an STA to receive the DL MU PPDU.
  • the HE-SIG A 1030 may indicate an indicator indicating whether a transmitted PPDU is DL or UL transmission, an identifier of a specific STA (or AP) to receive the PPDU, and a group of a specific STA to receive the PPDU. It may include information for indicating.
  • the HE-SIG A 1030 may also include resource allocation information for receiving the DL MU PPDU of the STA.
  • the HE-SIG A 1030 may include color bit information, bandwidth information, transmission opportunity (TXOP) duration information, tail bits, and cyclic redundancy check (CRC) for BSS identification information.
  • MCS modulation and coding scheme
  • CP cyclic prefix
  • GI guard interval
  • the HE-SIG A 1030 may have a repetition mode for transmission range extension. If the repetition mode is used in the HE-SIG A 1030, the use of the repetition mode may be indicated prior to the HE-SIG A 1030. In the repeat mode, the HE-SIG A 1030 may be repeated once. The bit interleaver may be bypassed in repeated HE-SIG A symbols.
  • the HE-SIG B 1040 may include information on the length of a physical layer service data unit (PSDU) for each STA, information on an MCS, tail bits, and the like. In addition, the HE-SIG B 1040 may include information on an STA to receive a PPDU, OFDMA-based resource allocation information (or MU-MIMO information). When the HE-SIG B 1040 includes OFDMA-based resource allocation information (or MU-MIMO related information), the HE-SIG A 1030 may not include resource allocation information.
  • PSDU physical layer service data unit
  • the previous field of the HE-SIG B 1040 on the DL MU PPDU may be transmitted in duplicated form in each of different transmission resources.
  • the HE-SIG B 1040 transmitted in some resource units (for example, resource unit 1 and resource unit 2) is an independent field including individual information, and the remaining resources.
  • the HE-SIG B 1040 transmitted in a unit (eg, resource unit 3, resource unit 4) is an HE-SIG B 1040 transmitted in another resource unit (eg, resource unit 1, resource unit 2). ) May be in a format duplicated.
  • the HE-SIG B 1040 may include a common block and a plurality of user blocks.
  • the general block may include information on resource allocation, and the user block may include STA-specific information (or user specific information).
  • a separate CRC may be defined for the general block, and a separate CRC may be defined for each of the set number of user blocks.
  • the HE-SIG B 1040 includes one common block and five user blocks (user blocks 1 to 5), and user blocks in units of two user blocks. It may be assumed that a CRC for is defined. In this case, the CRC1 for the general block, the CRC2 for the user block 1 and the user block 2, the CRC3 for the user block 3 and the user block 4, and the CRC4 for the user block 5 may be included in the HE-SIG B.
  • Each of the plurality of user blocks included in the HE-SIG B 1040 transmitted in one resource unit may include information about the plurality of users.
  • the user block 1 may include user specific information about STA1 and STA2
  • the user block 2 may include user specific information about STA3 and STA4.
  • HE-SIG B1 transmitted in resource unit 1 and HE-SIG B2 transmitted in resource unit 2 may be HE-SIG B including different information.
  • the HE-SIG B1 transmitted in resource unit 1 may include a general block and a user block for STA 1 and STA2
  • the HE-SIG B2 transmitted in resource unit 2 may include a general block for STA 3 and STA4. Block and user block.
  • the HE-SIG B1 transmitted in the resource unit 3 may be generated by duplication of the HE-SIG B1 transmitted in the resource unit 1
  • the HE-SIG B2 transmitted in the resource unit 4 is transmitted in the resource unit 1.
  • the HE-SIG B2 may be generated by duplication.
  • the HE-STF 1050 may be used to improve automatic gain control estimation in a multiple input multiple output (MIMO) environment or an OFDMA environment.
  • MIMO multiple input multiple output
  • OFDMA orthogonal frequency division multiple access
  • the STA1 may receive the HE-STF1 transmitted through the resource unit 1 from the AP, and decode the data field 1 (or frame 1) by performing synchronization, channel tracking / prediction, and AGC.
  • the STA2 may receive the HE-STF2 transmitted through the resource unit 2 from the AP, and decode the data field 2 (or frame 2) by performing synchronization, channel tracking / prediction, and AGC.
  • the STA3 may receive the HE-STF3 transmitted through the resource unit 3 from the AP, and decode the data field 3 (or frame 3) by performing synchronization, channel tracking / prediction, and AGC.
  • the STA4 may receive the HE-STF4 transmitted through the resource unit 4 from the AP, and decode the data field 4 (or frame 4) by performing synchronization, channel tracking / prediction, and AGC.
  • the HE-LTF 1060 may be used to estimate a channel in a MIMO environment or an OFDMA environment.
  • the size of the IFFT applied to the field after the HE-STF 1050 and the HE-STF 1050 and the size of the IFFT applied to the field before the HE-STF 1050 may be different.
  • the size of the IFFT applied to the field after the HE-STF 1050 and the HE-STF 1050 may be four times larger than the size of the IFFT applied to the field before the HE-STF 1050.
  • the STA may receive the HE-SIG A 1030 and may be instructed to receive a downlink PPDU based on the HE-SIG A 1030.
  • the STA may perform decoding based on the changed FFT size from the field after the HE-STF 1050 and the HE-STF 1050.
  • the STA may stop decoding and configure a network allocation vector (NAV).
  • NAV network allocation vector
  • the cyclic prefix (CP) of the HE-STF 1050 may have a larger size than the CP of another field, and during this CP period, the STA may perform decoding on the downlink PPDU by changing the FFT size.
  • An access point allocates each of a plurality of resource units for each of a plurality of STAs over the entire bandwidth, and each of the individual data fields (or frames) for each of the plurality of STAs through each of the plurality of resource units to each of the plurality of STAs. ) Can be sent.
  • Information on the allocation of each of the plurality of resource units for each of the plurality of STAs may be included in the HE-SIG A 1050 or the HE-SIG B 1060 as described above.
  • FIG. 11 is a conceptual diagram illustrating an RTS frame format according to an embodiment of the present invention.
  • an RTS frame includes a frame control field 1100, a duration field 1110, a receiver address (RA) field 1120, a transmitter address (TA) field 1130, and a frame check sequence (FCS) field (FCS). 1140).
  • RA receiver address
  • TA transmitter address
  • FCS frame check sequence
  • the frame control field 1100 may include information for indicating an RTS frame.
  • the duration field 1110 may include a CTS frame, a downlink frame transmitted to each of the plurality of STAs, and duration information for transmitting the ACK frame.
  • the RA field 1120 may include identification information of the target STA.
  • the RA field 1120 may be a field of 48 bits (6 octets).
  • 12 bits may be allocated to one target STA.
  • Each of 12 bits included in 48 bits may include identification information of a target STA.
  • the RA field 1120 may include identification information of the target STA and information on the target STA allocation subband (or resource). For example, 12 bits may include a target STA allocation subband (0-2 bits) and a partial ID (9-10 bits) of the STA.
  • the TA field 1130 may include an address of an AP transmitting an RTS frame.
  • the FCS field 1140 may include information for checking the validity of the frame.
  • FIG. 12 is a conceptual diagram illustrating a PPDU for delivering an RTS frame according to an embodiment of the present invention.
  • a new RTS frame (or a physical layer request to send (pRTS) frame (pRTS PPDU) frame) of a NDP (null data packet) format is disclosed.
  • pRTS physical layer request to send
  • the pRTS PPDU includes a legacy field (or legacy field) (or legacy (L) -part) 1200, a HE-SIG-A field 1220, and a HE-SIG-B field ( 1240).
  • the legacy portion 1200 may include the L-STF, L-LTF, and L-SIG described above.
  • the HE-SIG-A 1220 may include the information described above with reference to FIG. 10.
  • the HE-SIG-B 1240 includes a trigger indicator field, a trigger type field, a continuous indication field, a PBSSID field, a TXOP length field, a broadcast / unicast STA ID field, a DL data resource allocation information field, a UL CTS resource allocation information field. It may include a DL data transmission information field and a UL CTS transmission information field.
  • the trigger indication field may include a trigger indicator indicating that the transmitted frame is a trigger frame.
  • the trigger type field may include information indicating that the pRTS PPDU serves as a trigger frame.
  • the cascade indication field may indicate whether a downlink (DL) / uplink (UL) cascade structure is used.
  • the PBSSID field may include information about a partial BSSID.
  • the TXOP length field may include information on the duration of the TXOP for transmission and reception of traffic data according to transmission of the pRTS PPDU / CTS PPDU and the pRTS PPDU / CTS PPDU.
  • the broadcast / unicast STA ID field is an ID of a STA to transmit downlink data (downlink frame) in broadcast through broadcast transmission or unicast transmission, and an STA of a STA to transmit downlink data (downlink frame) in unicast transmission. It may include information about the ID.
  • the DL data resource allocation information field may include information on allocation of radio resource data for transmission of downlink data (or downlink frame) transmitted after reception of the CTS PPDU.
  • the UL CTS resource allocation information field may include information on allocation of radio resource data for transmission of a CTS PPDU to be transmitted by the STA.
  • the DL data Tx information field may include information on a transmission method of a downlink frame.
  • the DL data transmission information field may include information on whether space-time block coding (STBC) is used for transmission of the downlink frame, information on a coding method for transmission of the downlink frame, and information on the downlink frame. It may include information about the number of space-time streams for transmission.
  • STBC space-time block coding
  • the UL CTS Tx information field may include information on a method of transmitting a CTS PPDU.
  • the UL CTS transmission information field is an optional field and may not be included in the pRTS PPDU.
  • This pRTS PPDU cannot be decoded by legacy terminals. Accordingly, the AP may protect the TXOP by transmitting the CTS-to-self PPDU before transmitting the pRTS PPDU.
  • the CTS-to-self PPDU may be used to limit the media use of the STA that receives the CTS-to-self PPDU without a separate response frame.
  • FIG. 13 is a conceptual diagram illustrating a method of transmitting downlink data based on DL MU OFDMA transmission according to an embodiment of the present invention.
  • FIG. 13 a media protection method based on a pRTS PPDU is disclosed.
  • the AP may transmit the CTS-to-self PPDU 1300 on a plurality of channels.
  • the PPDU delivering the CTS-to-self PPDU 1300 may be expressed by the term CTS-to-self PPDU 1300.
  • the CTS-to-self PPDU 1300 may be a legacy format PPDU including only a legacy portion excluding the HE portion as a PPDU header.
  • the CTS-to-self PPDU 1300 which is a legacy format PPDU, may be decoded by a legacy STA / non-legacy STA.
  • the legacy STA means an STA that cannot decode the HE portion of the PPDU header defined in FIG. 10, an STA that does not support DL MU OFDMA transmission / UL MU OFDMA transmission, or an STA that cannot decode the pRTS PPDU 1310. can do.
  • the non-legacy STA may refer to an STA capable of decoding the HE portion defined in FIG. 10, an STA supporting DL MU OFDMA transmission / UL MU OFDMA transmission, or an STA capable of decoding the pRTS frame 1310.
  • the AP may include a first channel (or first resource unit, primary channel), a second channel (or second resource unit, secondary channel), a third channel (or third resource unit, tertiary channel), and a fourth
  • the CTS-to-self PPDU 1300 may be transmitted on a channel (quaternary channel).
  • the legacy STA receiving the CTS-to-self PPDU 1300 may suspend access to the medium for a period of time (eg, a TXOP duration indicated based on the CTS-to-self PPDU 1300). .
  • the AP may transmit the pRTS PPDU 1310.
  • the pRTS PPDU 1310 may have the format described above with reference to FIG. 12.
  • the pRTS PPDU 1310 may be a non-legacy PPDU that includes the HE portion. Non-legacy PPDUs can only be decoded by non-legacy STAs.
  • the AP may include a first channel (or first resource unit, primary channel), a second channel (or second resource unit, secondary channel), a third channel (or third resource unit, tertiary channel), and a fourth A pRTS PPDU may be transmitted on a channel (quaternary channel).
  • the pRTS PPDU 1310 may be decoded by a non-legacy STA and based on a plurality of non-legacy STAs (or pRTS PPDUs) whose resource allocation is indicated based on the pRTS PPDU 1310 among the non-legacy STAs. At least one of the plurality of non-legacy STAs (or target non-legacy STAs) indicated with the pending downlink data may transmit the CTS PPDU 1320 including the CTS frame to the AP.
  • the CTS PPDU 1320 may be a legacy PPDU not including the HE portion or a non-legacy PPDU including the HE portion.
  • a plurality of target non-legacy STAs whose resource allocation is indicated based on the pRTS PPDU 1310 may transmit the CTS PPDU 1320 to the AP based on UL MU OFDMA transmission through the allocated resource unit.
  • the plurality of target non-legacy STAs in which resource allocation is indicated based on the pRTS PPDU 1310 may transmit the CTS PPDU 1320 based on UL uplink single user (SU) transmission.
  • SU uplink single user
  • the AP may transmit each of the plurality of downlink frames (or downlink data) to each of the plurality of non-legacy STAs that have transmitted the CTS PPDU 1320.
  • the plurality of downlink frames may be transmitted through the DL MU PPDU 1330, which is a non-legacy PPDU.
  • Each of the plurality of non-legacy STAs receiving each of the plurality of downlink frames may transmit an ACK frame (or block ACK frame) 1340 to the AP based on the UL MU OFDMA transmission.
  • FIG. 14 is a conceptual diagram illustrating a method of transmitting downlink data based on DL MU OFDMA transmission according to an embodiment of the present invention.
  • a media protection method based on a pRTS PPDU is disclosed.
  • a transmission and reception procedure of a frame / PPDU between one AP and a plurality of non-legacy STAs is disclosed.
  • the AP may transmit a CTS-to-self PPDU 1400.
  • the CTS-to-self PPDU 1400 may be received and decoded by a plurality of legacy STAs.
  • the plurality of legacy STAs receiving the CTS-to-self PPDU 1400 may suspend access to the medium for a predetermined time.
  • the AP may transmit the pRTS PPDU 1410 to the plurality of non-legacy STAs.
  • the pRTS PPDU 1410 may transmit information about a plurality of target non-legacy STAs (or CTS PPDUs 1420) to receive a plurality of downlink data (or a plurality of downlink frames) to the plurality of non-legacy STAs.
  • a plurality of target non-legacy STAs (or a plurality of target non-legacy STAs to transmit the CTS PPDU 1420) to receive the downlink data may transmit the CTS PPDU 1420 on the allocated transmission resources.
  • the AP Upon receiving the CTS PPDU 1420, the AP transmits a DL MU PPDU 1430 including downlink data (or downlink frames) based on DL MU OFDMA transmission to a plurality of target non-legacy STAs that will receive the downlink data. Can be.
  • the plurality of target non-legacy STAs that receive downlink data (or downlink frame) may transmit a PPDU including an ACK frame (or block ACK frame) 1440 to the AP.
  • 15 is a conceptual diagram illustrating a method of transmitting downlink data based on DL MU OFDMA transmission according to an embodiment of the present invention.
  • FIG. 15 a method of transmitting a separate pRTS PPDU through each channel (or resource unit) is disclosed for medium protection.
  • the AP may transmit a CTS-to-self PPDU on a first channel (or first resource unit, primary channel) and a second channel (or second resource unit, secondary channel). Based on the CTS-to-self PPDU, access to the medium of the legacy STA may be restricted for a certain time.
  • the AP transmits the pRTS PPDU1 1510 to the target non-legacy STAs STA1 and STA2 through the first channel based on the DL MU OFDMA transmission, and transmits the pRTS PPDU2 1520 to the target non-legacy STA STA3 and the second channel. It can transmit to STA4.
  • the pRTS PPDU1 1510 is configured with resource information for transmission of the CTS PPDU1 1530 of each of the STA1 and STA2 (resource allocation for transmission of a downlink frame to each of the STA1 and STA2). Information may be included.
  • the pRTS PPDU2 1520 is configured with resource information for transmitting the CTS PPDU2 1540 of each of the STA3 and the STA4 and the resource allocation (the resource allocation for the transmission of the downlink frame to each of the STA3 and the STA4). Information may be included.
  • STA1 and STA2 may transmit the CTS PPDU1 1530 to the AP through the first channel, and STA3 and STA4 may transmit the CTS PPDU2 1540 to the AP through the second channel.
  • the AP may transmit downlink frame 1 and downlink frame 2 through the first channel through the DL MU PPDU 1550 to the STA1 and the STA2, respectively.
  • the AP downlinks frame 1 to STA1 and STA2 through a resource unit (eg, sub-channel 1 (sub-resource unit 1) and sub-channel 2 (sub-resource unit 2)) divided on the first channel.
  • downlink frame 2 may be transmitted through the DL MU PPDU1 1550.
  • the AP may transmit downlink frame 1 to STA1 through lower channel 1 and may transmit downlink frame 2 to STA2 through lower channel 2.
  • the AP may transmit downlink frame 3 and downlink frame 4 through the second channel through the DL MU PPDU2 1560 to the STA3 and the STA4, respectively.
  • the AP downlinks the frame 3 to each of the STA3 and the STA4 through resource units (eg, subchannel 3 (subordinate resource unit 3) and subchannel 4 (subordinate resource unit 4) divided on the second channel.
  • downlink frame 4 may be transmitted through DL MU PPDU2 1560.
  • the AP may transmit downlink frame 3 to STA3 through lower channel 3, and may transmit downlink frame 4 to STA4 through lower channel 4.
  • Each of the STA1 and the STA2 may transmit an ACK frame (or a block ACK frame) for each of the downlink frame 1 and the downlink frame 2 to the AP.
  • Each of the STA3 and the STA4 may transmit an ACK frame (or a block ACK frame) for each of the downlink frame 3 and the downlink frame 4 to the AP.
  • 16 is a conceptual diagram illustrating a method of transmitting downlink data based on DL MU OFDMA transmission according to an embodiment of the present invention.
  • FIG. 16 a method of transmitting the same pRTS PPDU through each channel (or resource unit) is disclosed for medium protection.
  • the AP may transmit a CTS-to-self PPDU on a first channel (or first resource unit, primary channel) and a second channel (or second resource unit, secondary channel). Access to the medium of the non-legacy STA may be restricted based on the CTS-to-self PPDU.
  • the AP may transmit the pRTS PPDU 1610 to the STA1, the STA2, the STA3, and the STA4 through the first channel and the second channel based on the DL MU OFDMA transmission.
  • the pRTS PPDU 1610 is assigned to each of STA1, STA2, STA3, and STA4, and the resource allocation (STA1, STA2, STA3 and STA4, respectively) for transmission of the CTS PPDU 1630 of each of the STA1, STA2, STA3, and STA4 Information on resource allocation for downlink transmission).
  • Each of the STA1, the STA2, the STA3, and the STA4 may transmit the CTS PPDU 1630 to the AP through the first channel and the second channel.
  • the AP may transmit downlink frame 1 and downlink frame 2 to the STA1 and the STA2, respectively, through the first channel through the DL MU PPDU1 1650.
  • the AP downlinks frame 1 to STA1 and STA2 through a resource unit (eg, sub-channel 1 (sub-resource unit 1) and sub-channel 2 (sub-resource unit 2)) divided on the first channel.
  • downlink frame 2 may be transmitted through the DL MU PPDU1 1650.
  • the AP may transmit downlink frame 1 to STA1 through lower channel 1 and may transmit downlink frame 2 to STA2 through lower channel 2.
  • the AP may transmit the downlink frame 3 and the downlink frame 4 to the STA3 and the STA4, respectively, through the second channel through the DL MU PPDU2 1670.
  • the AP downlinks the frame 3 to each of the STA3 and the STA4 through resource units (eg, subchannel 3 (subordinate resource unit 3) and subchannel 4 (subordinate resource unit 4) divided on the second channel.
  • downlink frame 4 may be transmitted through the DL MU PPDU2 1670.
  • the AP may transmit downlink frame 3 to STA3 through lower channel 3, and may transmit downlink frame 4 to STA4 through lower channel 4.
  • Each of the STA1 and the STA2 may transmit an ACK frame (or a block ACK frame) for each of the downlink frame 1 and the downlink frame 2 to the AP.
  • Each of the STA3 and the STA4 may transmit an ACK frame (or a block ACK frame) for each of the downlink frame 3 and the downlink frame 4 to the AP.
  • the UL CTS resource allocation field for allocating the transmission resources of the CTS PPDU included in the pRTS PPDU may be indicated. There may be no relationship between resource allocation information for receiving downlink data, information on an STA receiving a pRTS PPDU (or a reception address of a pRTS PPDU), and a transmission channel of a CTS PPDU.
  • the UL CTS resource allocation field and the UL CTS transmission information field may be omitted in the pRTS PPDU.
  • 17 is a conceptual diagram illustrating a method of transmitting downlink data based on DL MU OFDMA transmission according to an embodiment of the present invention.
  • L-SIG protection is used to protect the medium to protect the TXOP by restricting the media access of the legacy terminal.
  • an AP may transmit a pRTS PPDU. Specifically, the AP may transmit the pRTS PPDU1 1710 to STA1 and STA2 through the first channel, and the AP may transmit the pRTS PPDU2 1720 to STA3 and STA4 through the second channel.
  • the legacy part (L-part) of the pRTS PPDUs 1710 and 1720 may include an L-SIG field, and the L-SIG field is previously included in L_DATARATE and PPDU indicating a data rate of the PHY layer. It may include L_LENGTH indicating the length of the PSDU. L_SIG duration protected based on L-SIG protection may be determined based on L_LENGTH / L_DATARATE. According to an embodiment of the present invention, L-SIG duration is adjusted by length of L_LENGTH, CTS PPDUs 1730 and 1740, DL MU PPDUs 1750 and 1760 for transmitting downlink data frames, and ACK frames (block ACK frames). It may be configured for TXOP protection for transmission of the ACK PPDU carrying.
  • the legacy STA may decode the legacy part
  • access to the medium may be restricted during the TXOP duration based on the decoding of the L-SIG field.
  • the STA1 and the STA2 may receive the pRTS PPDU1 1710 transmitted through the first channel, and transmit the CTS PPDU 1730 to the AP through the first channel in response to the pRTS PPDU1 1710.
  • the STA3 and the STA4 may receive the pRTS PPDU2 1720 transmitted through the second channel, and transmit the CTS PPDU 1740 to the AP through the second channel in response to the pRTS PPDU2 1720.
  • the AP may transmit downlink frame 1 and downlink frame 2 to the STA1 and the STA2, respectively, on the first channel through the DL MU PPDU1 1750.
  • the AP downlinks frame 1 to STA1 and STA2 through a resource unit (eg, sub-channel 1 (sub-resource unit 1) and sub-channel 2 (sub-resource unit 2)) divided on the first channel.
  • downlink frame 2 may be transmitted.
  • the AP may transmit downlink frame 1 to STA1 through lower channel 1 and may transmit downlink frame 2 to STA2 through lower channel 2.
  • the AP may transmit each of downlink frame 3 and downlink frame 4 to each of STA3 and STA4 on the second channel through DL MU PPDU2 1760.
  • the AP downlinks the frame 3 to each of the STA3 and the STA4 through resource units (eg, subchannel 3 (subordinate resource unit 3) and subchannel 4 (subordinate resource unit 4) divided on the second channel.
  • resource units eg, subchannel 3 (subordinate resource unit 3) and subchannel 4 (subordinate resource unit 4) divided on the second channel.
  • downlink frame 4 may be transmitted.
  • the AP may transmit downlink frame 3 to STA3 through lower channel 3, and may transmit downlink frame 4 to STA4 through lower channel 4.
  • Each of the STA1 and the STA2 may transmit an ACK frame (or a block ACK frame) for each of the downlink frame 1 and the downlink frame 2 to the AP.
  • Each of the STA3 and the STA4 may transmit an ACK frame (or a block ACK frame) for each of the downlink frame 3 and the downlink frame 4 to the AP.
  • FIG. 18 is a conceptual diagram illustrating a method of transmitting downlink data based on DL MU OFDMA transmission according to an embodiment of the present invention.
  • L-SIG protection is used to protect the medium to protect the TXOP by restricting the media access of the legacy terminal.
  • the AP may transmit a pRTS PPDU 1810.
  • the AP may transmit the pRTS PPDU to the STA1, the STA2, the STA3, and the STA4 through the first channel and the second channel.
  • the legacy STA may decode the legacy part
  • access to the medium may be restricted during the TXOP duration based on the decoding of the L-SIG field.
  • Each of the STA1 to STA4 may transmit the CTS frame 1830 to the AP through the first channel and the second channel.
  • the AP may transmit downlink frame 1 and downlink frame 2 to the STA1 and the STA2, respectively, on the first channel through the DL MU PPDU1 1850.
  • the AP downlinks frame 1 to STA1 and STA2 through a resource unit (eg, sub-channel 1 (sub-resource unit 1) and sub-channel 2 (sub-resource unit 2)) divided on the first channel.
  • downlink frame 2 may be transmitted.
  • the AP may transmit downlink frame 1 to STA1 through lower channel 1 and may transmit downlink frame 2 to STA2 through lower channel 2.
  • the AP may transmit the downlink frame 3 and the downlink frame 4 to the STA3 and the STA4, respectively, on the second channel through the DL MU PPDU2 1870.
  • the AP downlinks the frame 3 to each of the STA3 and the STA4 through resource units (eg, subchannel 3 (subordinate resource unit 3) and subchannel 4 (subordinate resource unit 4) divided on the second channel.
  • resource units eg, subchannel 3 (subordinate resource unit 3) and subchannel 4 (subordinate resource unit 4) divided on the second channel.
  • downlink frame 4 may be transmitted.
  • the AP may transmit downlink frame 3 to STA3 through lower channel 3, and may transmit downlink frame 4 to STA4 through lower channel 4.
  • Each of the STA1 and the STA2 may transmit an ACK frame (or a block ACK frame) for each of the downlink frame 1 and the downlink frame 2 to the AP.
  • Each of the STA3 and the STA4 may transmit an ACK frame (or a block ACK frame) for each of the downlink frame 3 and the downlink frame 4 to the AP.
  • FIG. 19 is a block diagram illustrating a wireless device to which an embodiment of the present invention can be applied.
  • the wireless device 1900 may be an STA that may implement the above-described embodiments and may be an AP 1900 or a non-AP station (or STA) 1950.
  • the AP 1900 includes a processor 1910, a memory 1920, and a radio frequency unit 1930.
  • the RF unit 1930 may be connected to the processor 1910 to transmit / receive a radio signal.
  • the processor 1910 may implement the functions, processes, and / or methods proposed in the present invention.
  • the processor 1910 may be implemented to perform the operation of the AP according to the above-described embodiment of the present invention.
  • the processor may perform the operation of the AP disclosed in the embodiment of FIGS. 1 to 18.
  • the processor 1910 transmits a clear to send (CTS) -to-self physical layer protocol data unit (PPDU) through a plurality of channels, and a physical layer request of a non-legacy format through a plurality of channels. to send) and transmits a PPDU and receives each of a plurality of CTS frames from each of a plurality of target non-legacy STAs through a plurality of channels.
  • CTS clear to send
  • PPDU physical layer protocol data unit
  • the processor 1910 transmits each of a plurality of data frames based on downlink (DL) multiple user (MU) orthogonal frequency division multiple access (OFDMA) transmissions to a plurality of target non-legacy STAs through a plurality of channels, It may be implemented to receive each of a plurality of acknowledgment (ACK) frames from each of the plurality of target non-legacy STAs through the plurality of channels.
  • DL downlink
  • MU multiple user
  • OFDMA orthogonal frequency division multiple access
  • the CTS-to-self PPDU includes a legacy signal field that is decoded by the legacy STA to restrict the media access of the legacy STA, and the pRTS PPDU includes a plurality of target non-legacy that will receive a plurality of data frames among the plurality of non-legacy STAs. It includes a high efficiency (HE) signal field that is decoded by a plurality of non-legacy STAs to restrict the medium access of the remaining non-legacy STAs, except for the STA, each of the plurality of CTS frames is legacy It may include a legacy signal field decoded by the STA.
  • HE high efficiency
  • the STA 1950 includes a processor 1960, a memory 1970, and a radio frequency unit 1980.
  • the RF unit 1980 may be connected to the processor 1960 to transmit / receive a radio signal.
  • the processor 1960 may implement the functions, processes, and / or methods proposed in the present invention.
  • the processor 1920 may be implemented to perform the operation of the STA according to the above-described embodiment of the present invention.
  • the processor may perform an operation of the STA in the embodiment of FIGS. 1 to 18.
  • the processor 1960 may be implemented to receive a pRTS PPDU in a non-legacy format, transmit a CTS frame on an allocated resource based on the pRTS PPDU, and receive a downlink data frame.
  • the processor 1960 may stop access to the medium during the TXOP duration set based on the L-SIG field.
  • Processors 1910 and 1960 may include application-specific integrated circuits (ASICs), other chipsets, logic circuits, data processing devices, and / or converters for interconverting baseband signals and wireless signals.
  • the memory 1920, 1970 may include read-only memory (ROM), random access memory (RAM), flash memory, memory cards, storage media, and / or other storage devices.
  • the RF unit 1930 and 1980 may include one or more antennas for transmitting and / or receiving a radio signal.
  • Modules may be stored in memory 1920, 1970 and executed by processors 1910, 1960.
  • the memories 1920 and 1970 may be internal or external to the processors 1910 and 1960, and may be connected to the processors 1910 and 1960 by various well-known means.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un procédé et un appareil pour la protection d'un support dans un réseau local (LAN) sans fil. Le procédé pour la protection d'un support dans un LAN sans fil peut comprendre : la transmission d'une PPDU CTS-à-soi-même par un AP ; la transmission d'une PPDU pRTS d'un format non existant par l'AP ; la réception de multiples trames CTS en provenance de multiples STA non existantes cibles par l'intermédiaire de multiples canaux par l'AP, respectivement ; la transmission de multiples trames de données aux multiples STA non existantes cibles en fonction d'une transmission OFDMA MU DL par l'intermédiaire des multiples canaux par l'AP, respectivement ; et la réception de multiples trames d'ACK en provenance des multiples STA non existantes cibles par l'intermédiaire des multiples canaux par l'AP, respectivement.
PCT/KR2016/001555 2015-04-08 2016-02-16 Procédé et appareil de protection de support dans un lan sans fil WO2016163639A1 (fr)

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