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WO2017003062A1 - Procédé et dispositif pour régler un état d'une sta fonctionnant dans un mode d'économie d'énergie dans un intervalle de balise - Google Patents

Procédé et dispositif pour régler un état d'une sta fonctionnant dans un mode d'économie d'énergie dans un intervalle de balise Download PDF

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Publication number
WO2017003062A1
WO2017003062A1 PCT/KR2016/001584 KR2016001584W WO2017003062A1 WO 2017003062 A1 WO2017003062 A1 WO 2017003062A1 KR 2016001584 W KR2016001584 W KR 2016001584W WO 2017003062 A1 WO2017003062 A1 WO 2017003062A1
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WIPO (PCT)
Prior art keywords
frame
sta
trigger frame
state
scheduled
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Ceased
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PCT/KR2016/001584
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English (en)
Korean (ko)
Inventor
최혜영
류기선
김정기
조한규
김서욱
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LG Electronics Inc
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LG Electronics Inc
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/02—Power saving arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • 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]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the present invention relates to wireless communication, and more particularly, to a method and apparatus for setting a state of a station (STA) operating in a power save mode within a beacon interval.
  • STA station
  • next-generation WLANs 1) enhancements to the Institute of Electronics and Electronics Engineers (IEEE) 802.11 physical physical access (PHY) and medium access control (MAC) layers in the 2.4 GHz and 5 GHz bands, and 2) spectral efficiency and area throughput. aim to improve performance in real indoor and outdoor environments, such as environments with interference sources, dense heterogeneous network environments, and high user loads. .
  • IEEE Institute of Electronics and Electronics Engineers
  • PHY physical physical access
  • MAC medium access control
  • next-generation WLAN The environment mainly considered in the next-generation WLAN is a dense environment having many access points (APs) and a station (STA), and improvements in spectral efficiency and area throughput are discussed in such a dense environment.
  • next generation WLAN there is an interest in improving practical performance not only in an indoor environment but also in an outdoor environment, which is not much considered in a conventional WLAN.
  • next-generation WLAN there is a great interest in scenarios such as wireless office, smart home, stadium, hotspot, building / apartment, and AP based on the scenario.
  • STA are discussing about improving system performance in a dense environment with many STAs.
  • next-generation WLAN In addition, in the next-generation WLAN, there will be more discussion about improving system performance in outdoor overlapping basic service set (OBSS) environment, improving outdoor environment performance, and cellular offloading, rather than improving single link performance in one basic service set (BSS). It is expected.
  • the directionality of these next-generation WLANs means that next-generation WLANs will increasingly have a technology range similar to that of mobile communications. Considering the recent situation in which mobile communication and WLAN technology are discussed together in the small cell and direct-to-direct (D2D) communication area, the technical and business convergence of next-generation WLAN and mobile communication is expected to become more active.
  • D2D direct-to-direct
  • An object of the present invention is to provide a method for setting a state of an STA operating in a power save mode within a beacon interval.
  • a method for setting a state of a STA operating in a power save mode within a beacon interval includes a random access trigger frame transmitted by an STA by an access point (AP). Transmitting an uplink frame including buffer status information based on the STA, wherein the STA receives a block acknowledgment frame for the uplink frame from the AP, wherein the block ACK frame includes a status indication field And determining, by the STA, whether to maintain an awake state or a doze state on the remaining intervals of a current beacon interval based on the status indication field, wherein the random access trigger frame is configured to determine the STA.
  • AP access point
  • the status indication field may include information on whether to maintain the awake state or switch to the doze state of each of the plurality of STAs.
  • the STA (station) operating in the power save mode within the beacon interval in accordance with another aspect of the present invention for achieving the above object of the present invention is a radio frequency (RF) unit for transmitting and receiving a radio signal and the RF unit;
  • RF radio frequency
  • a processor operatively coupled to the processor, wherein the processor transmits an uplink frame including buffer status information based on a random access trigger frame transmitted by an access point (AP), and transmits an uplink frame from the AP Receive a block acknowledgment (ACK) frame for a link frame, wherein the block ACK frame includes a status indication field, and transitions to a doze state or maintains an awake state on the remaining sections of the current beacon interval based on the status indication field.
  • AP access point
  • ACK block acknowledgment
  • the random access trigger frame is a plurality of including the STA Trigger UL uplink multi-user (MU) transmission to the AP based on random access of the STA, and the status indication field indicates whether to maintain the awake state or switch to the doze state of each of the plurality of STAs.
  • Information may be included.
  • the operation state of the STA operating in the power save mode may be determined according to whether uplink transmission resources are scheduled within the beacon interval, thereby saving power of the STA.
  • WLAN wireless local area network
  • FIG. 2 is a conceptual diagram illustrating a method of transmitting an uplink frame based on a trigger frame according to an embodiment of the present invention.
  • FIG. 3 is a conceptual diagram illustrating a block ACK frame according to an embodiment of the present invention.
  • FIG. 4 is a conceptual diagram illustrating a block ACK frame according to an embodiment of the present invention.
  • FIG. 5 is a conceptual diagram illustrating a block ACK frame according to an embodiment of the present invention.
  • FIG. 6 is a conceptual diagram illustrating a block ACK frame according to an embodiment of the present invention.
  • FIG. 7 is a conceptual diagram illustrating a trigger frame transmission method according to an embodiment of the present invention.
  • FIG. 8 is a conceptual diagram illustrating a DL MU PPDU format according to an embodiment of the present invention.
  • FIG. 9 is a conceptual diagram illustrating transmission of an UL MU PPDU according to an embodiment of the present invention.
  • FIG. 10 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.
  • the data (or frame) transmitted from the AP to the STA is downlink data (or downlink frame), and the data (or frame) transmitted from the STA to the AP is uplink data (or uplink frame). It can be expressed by the term).
  • the transmission from the AP to the STA may be expressed in terms of downlink transmission, and the transmission from the STA to the AP may be expressed in terms of uplink transmission.
  • each of the PHY protocol 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 be a data unit including a frame (or an information unit of a MAC layer) or indicating a frame.
  • the PHY header may be referred to as a physical layer convergence protocol (PLCP) header in another term
  • the PHY preamble may be expressed as a PLCP preamble in another term.
  • each of the PPDUs, frames, and data transmitted through uplink transmission may be represented by the term uplink PPDU, uplink frame, and uplink data.
  • the entire bandwidth is used for downlink transmission to one STA and uplink transmission of one STA based on single-orthogonal frequency division multiplexing (SUDM) transmission.
  • the AP may perform DL (downlink) multi-user (MU) transmission based on MU MIMO (multiple input multiple output), and such transmission may be expressed by the term DL MU MIMO transmission. Can be.
  • an orthogonal frequency division multiple access (OFDMA) based transmission method may be supported for uplink transmission and downlink transmission.
  • the AP may perform DL MU transmission based on OFDMA, and such transmission may be expressed by the term DL MU OFDMA transmission.
  • the AP may transmit downlink data (or downlink frame, downlink PPDU) to each of the plurality of STAs through the plurality of frequency resources on the overlapped time resources.
  • the plurality of frequency resources may be a plurality of subbands (or subchannels) or a plurality of resource units (RUs) (eg, basic resource units (BRUs) defined with different sizes).
  • DL MU OFDMA transmission can be used with DL MU MIMO transmission. For example, DL MU MIMO transmission based on a plurality of space-time streams (or spatial streams) is performed on a specific subband (or subchannel) allocated for DL MU OFDMA transmission. Can be.
  • UL MU transmission uplink multi-user transmission
  • UL MU transmission may be supported for a plurality of STAs to transmit data to an AP on the same time resource.
  • Uplink transmission on the overlapped time resource by each of the plurality of STAs may be performed in the frequency domain or the spatial domain.
  • different frequency resources may be allocated as uplink transmission resources for each of the plurality of STAs based on OFDMA.
  • the different frequency resources may be different subbands (or subchannels) or different resource units (RUs).
  • Each of the plurality of STAs may transmit uplink data 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.
  • each of the plurality of STAs When uplink transmission by each of the plurality of STAs is performed in the spatial domain, different space-time streams (or spatial streams) are allocated to each of the plurality of STAs, and each of the plurality of STAs transmits uplink data through different space-time streams. Can transmit to the AP.
  • the transmission method through these different spatial streams may be represented by the term UL MU MIMO transmission method.
  • the UL MU OFDMA transmission and the UL MU MIMO transmission may be performed together.
  • UL MU MIMO transmission based on a plurality of space-time streams (or spatial streams) may be performed on a specific subband (or subchannel) allocated for UL MU OFDMA transmission.
  • a multi-channel allocation method was used to allocate a wider bandwidth (for example, a bandwidth exceeding 20 MHz) to one UE.
  • the multi-channel may include a plurality of 20 MHz channels when one channel unit is 20 MHz.
  • a primary channel rule is used to allocate a wide bandwidth to the terminal. If the primary channel rule is used, there is a constraint for allocating a wide bandwidth to the terminal. Specifically, according to the primary channel rule, when a secondary channel adjacent to the primary channel is used in an overlapped BSS (OBSS) and 'busy', the STA may use the remaining channels except the primary channel. Can not.
  • OBSS overlapped BSS
  • the STA can transmit the frame only through the primary channel, thereby being limited to the transmission of the frame through the multi-channel. That is, the primary channel rule used for multi-channel allocation in the existing WLAN system may be a big limitation in obtaining high throughput by operating a wide bandwidth in the current WLAN environment where there are not many OBSS.
  • a WLAN system supporting an orthogonal frequency division multiple access (OFDMA) technique is disclosed.
  • OFDMA technology When OFDMA technology is used, a plurality of terminals may be used simultaneously instead of one terminal without using a primary channel rule. Therefore, wide bandwidth operation is possible, and the efficiency of the operation of radio resources can be improved.
  • a time-frequency structure assumed in a WLAN system may be as follows.
  • 256 FFT / IFFT is applied for a bandwidth of 20 MHz
  • 512 FFT / IFFT is applied for a bandwidth of 40 MHz
  • 1024 FFT / IFFT is applied for a bandwidth of 80 MHz
  • 2048 FFT for a bandwidth of 160 MHz continuous or discontinuous 160 MHz.
  • IFFT can be applied.
  • the IDFT / DFT length (or effective symbol length) based on inverse discrete fourier transform (IDFT) / discrete fourier transform (DFT) (or FFT / IFFT) may be N times the IDFT / DFT length in the existing WLAN system. .
  • the length of an OFDM symbol may be a value obtained by adding a length of a guard interval (GI) to an IDFT / DFT length.
  • the length of the GI can be various values such as 0.4 ⁇ s, 0.8 ⁇ s, 1.6 ⁇ s, 2.4 ⁇ s, 3.2 ⁇ s.
  • Increased IFFT / FFT can be applied in the available system bandwidth in order to improve the throughput of the WLAN system or to improve the robustness against inter-symbol interference (ISI) in an outdoor environment.
  • ISI inter-symbol interference
  • the portion of the portion of the cyclic prefix (CP) Reducing the Ratio to Reduce the WLAN system may be designed to obtain throughput gain by the length of the CP.
  • the ratio of CP may be maintained to reduce performance degradation due to ISI in an outdoor environment based on the increased CP duration.
  • FIG. 2 is a conceptual diagram illustrating a method of transmitting an uplink frame based on a trigger frame according to an embodiment of the present invention.
  • the AP may transmit the beacon frame 200 to the plurality of STAs.
  • the beacon frame may include information about a target transmission time of a random access trigger frame 210 for UL MU transmission based on random access of a plurality of STAs.
  • the STA may receive the beacon frame 200 in the awake state and switch to the doze state until the target transmission time of the random access trigger frame 210.
  • the STA may be switched to the awake state at the target transmission time of the random access trigger frame 210 to receive the random access trigger frame 210.
  • the AP may transmit the random access trigger frame 210 to trigger transmission of the plurality of uplink frames 220 based on the random access of the plurality of STAs.
  • a plurality of STAs having buffered uplink data includes a plurality of STAs including buffer status report (BSR) information which is information on the buffered uplink data based on the random access.
  • BSR buffer status report
  • the uplink frame 220 may be transmitted to the AP based on the UL MU transmission.
  • the AP may receive a plurality of uplink frames 220 and transmit a block ACK frame 230 for the plurality of uplink frames 220 to the plurality of STAs.
  • the AP may transmit a scheduled trigger frame 240 that is a trigger frame for transmitting the pending uplink data of the plurality of STAs based on the BSR information.
  • the scheduled trigger frame 240 is triggered by the scheduled trigger frame 240 to inform the plurality of STAs to transmit the plurality of uplink data frames 250 and the uplink for each of the plurality of uplink data frames 250. It may include information about link transmission resources.
  • the plurality of STAs triggered in the scheduled trigger frame 240 may transmit the plurality of uplink data frames 250 based on the UL MU transmission.
  • the STA transmitting the uplink frame 220 based on the random access trigger frame 210 may not know the transmission time of the scheduled trigger frame 240. Therefore, the STA must operate in an awake state while monitoring the transmission of the scheduled trigger frame 240. That is, the STA may transmit an uplink frame 220 including BSR information, which is information on uplink data buffered to the STA, based on the random access trigger frame 210. Thereafter, the STA receives the block ACK frame 230 for the uplink frame 220 including the BSR information from the AP, and awake state to transmit the uplink data frame 250 including the uplink traffic data. While continuing to operate, the transmission of the scheduled trigger frame 240 to be transmitted by the AP may be monitored. Accordingly, the STA operating in the power save mode needs to switch to the doze state in the interval from receiving the block ACK frame 230 to before receiving the scheduled trigger frame 240.
  • the AP When the AP receives the uplink frame 220 from the STA based on the random access trigger frame 210 for the power save mode operation of the STA, the AP receives the block ACK frame 230 for the uplink frame 220.
  • Information on a transmission time of the scheduled trigger frame 240 to be transmitted to the STA may be transmitted through the STA. That is, the AP may transmit information on the target transmission time of the scheduled trigger frame 240 (or information on the re-switching time of the STA to the awake state) to the STA triggered through the random access trigger frame 210. have.
  • the STA may dose until the transmission of the scheduled trigger frame 240 based on the information on the target transmission time of the scheduled trigger frame 240 received from the AP (or the information on the time of re-switching to the awake state of the STA). The state can then be switched to the awake state.
  • a method of delivering information on a target transmission time of a scheduled trigger frame 240 (or information on a re-switching time of an STA to an awake state) is disclosed.
  • FIG. 3 is a conceptual diagram illustrating a block ACK frame according to an embodiment of the present invention.
  • FIG. 3 a method of transmitting information on a target transmission time of a scheduled trigger frame (or information on a re-switching time of an STA to an awake state) is disclosed.
  • the basic structure of the block ACK frame is IEEE P802.11-REVmcTM / D4.1, July 2015 Draft Standard for Information technology--Telecommunications and information exchange between systems Local and metropolitan area networks--Specific requirements Part 11: Wireless LAN Medium Access Control (MAC). and 8.3.1.9 BlockAck frame format in Physical Layer (PHY) Specifications.
  • the AP may 1) receive a scheduled trigger frame transmitted within the current beacon interval by staying awake within the current beacon interval at which the STA performed random access, or 2) the doze state until the STA transmits the next beacon frame.
  • Indicator to indicate whether to receive information on the target transmission time of the scheduled trigger frame through the next beacon frame after switching to the awake state at the time of transmission of the next beacon frame (hereinafter, doze status indicator) May be transmitted through an ACK frame (or a block ACK frame).
  • the AP may transmit information on whether an uplink resource for the STA is allocated within the current beacon interval through an ACK frame (or a block ACK frame).
  • a block ACK frame may include information for indicating a block ACK frame (multiple-block ACK frame) for a plurality of STAs.
  • the receiver address (RA) field 360 of the block ACK frame is an association identifier (AID) for broadcasting (for example, all AIDs are 0)
  • the type of the block ACK frame is for a plurality of STAs. It may be indicated by a block ACK frame.
  • the block ACK frame for the plurality of STAs may include ACK / NACK information for the plurality of STAs in the BA information field 350.
  • the type of the block ACK frame is indicated by the M-block ACK frame for the plurality of STAs, the multi-TID subfield value (300) of the block ACK frame is 1, and the GCR subfield When the (groupcast with retry) subfield (320) is 1, the compressed bitmap subfield 310 and the reserved field 330 of the block ACK frame may include a plurality of STAs. Can be used as the status indicator of.
  • Table 1 below is an existing table for indicating the type of the block ACK frame based on the multi-TID subfield 300, the GCR subfield 320 and the compressed bitmap subfield 310.
  • Multi-TID subfield value Compressed BitmapSubfield value
  • GCR subfield value BlockAckReq frame variant 0 0 0 Basic BlockAckReq 0 One 0 Compressed BlockAckReq One 0 0 Extended Compressed BlockAckReq One One 0 Multi-TID BlockAckReq 0 0 One Reserved 0 One One GCR BlockAckReq One 0 One Reserved One One One Reserved
  • the type of the block ACK frame for the multi-TID subfield 300 having a value of 1 and the GCR subfield 320 having a value of 1 is not defined.
  • the multi-TID subfield 300 having a value of 1 and the GCR subfield 320 having a value of 1 may indicate that the type of the block ACK frame is an M-block ACK frame.
  • the compressed bitmap subfield ( 310 and the conserved field 330 may be used as status indicators of the plurality of STAs.
  • the type of the block ACK frame is an M-block ACK frame.
  • the compressed bitmap subfield 310 and the conserved field 330 of the block ACK frame may be 9 bits in total, and each of the 9 bits is in the doze state in the remaining beacon intervals for each of the 9 STAs. Can be used as a status indicator containing information about.
  • An information unit including a plurality of status indicators for each of the plurality of STAs, such as the compressed bitmap subfield 310 and the preserved field 330, may be expressed by the term status indicator field.
  • the order of nine STAs corresponding to each of the 9-bit status indicators may correspond to the order of ACK / NACK information for each of the nine STAs included in the block acknowledgment (BA) information field 350 included in the block ACK frame. have.
  • the value of the multi-TID subfield 300 of the block ACK frame received by STA1, STA2, STA3, and STA4 is 1
  • the value of the GCR subfield 320 is 1
  • the BA information field of the block ACK frame ( It may be assumed that 350 includes ACK / NACK information for each of STA1, STA2, STA3, and STA4 sequentially.
  • one bit corresponding to the compressed bitmap subfield 310 may be used as a status indicator for STA1, and each of three bits of eight bits corresponding to the reserved field is sequentially assigned to each of STA2, STA3, and STA4.
  • the STA may monitor transmission of the scheduled trigger frame while maintaining an awake state for a period corresponding to the remaining beacon interval (or target beacon transmission time interval).
  • the STA may maintain the doze state for a period corresponding to the remaining beacon intervals, and may switch to the awake state at the time of transmission of the next beacon frame to receive the next beacon frame.
  • the next beacon frame may include information on the transmission time of the scheduled trigger frame.
  • a block ACK frame in which the status indicator for the specific STA is set to 1 may be transmitted.
  • a block ACK frame in which the status indicator for the specific STA is set to 0 may be transmitted.
  • the STA that receives the compressed bitmap subfield 310, the preserved field 330, and the BA information field 350 through the block ACK frame may order the ACK / NACK information of the STA included in the BA information field 350.
  • the location of the status indicator of the STA and the value of the status indicator of the STA may be checked, and it may be determined whether to switch to the doze state or maintain the awake state until the transmission time of the next beacon frame.
  • the More Data subfield (or MoreData field) of the frame control field of the M-block ACK, ACK or block ACK frame may indicate a status indicator of the STA. That is, when the More Data subfield of the frame control field of the M-block ACK frame received by the STA is 1 and the M-block ACK frame received by the STA includes the AID of the STA (or the STA transmits).
  • the STA wakes up during a period (or remaining TWT period) corresponding to the remaining beacon interval (or target beacon transmission time (TBTT) interval). You can monitor the transmission of the scheduled trigger frame while maintaining.
  • the STA when the STA receives a separate unicast ACK frame in which the More Data subfield of the frame control field is set to 1, the STA may correspond to a period corresponding to the remaining beacon interval (or target beacon transmission time (TBTT) interval) (or the remaining TWT). It is possible to monitor the transmission of a scheduled trigger frame while maintaining an awake state for a target wakeup time period.
  • the remaining beacon interval or target beacon transmission time (TBTT) interval
  • TWT target beacon transmission time
  • the STA may maintain a doze state for a period corresponding to the remaining beacon interval (or the remaining TWT interval), and when the next beacon frame is transmitted (or the next TWT start time) ) To receive the next beacon frame (or trigger frame).
  • the STA may maintain a doze state for a period (or remaining TWT interval) corresponding to the remaining beacon interval, and then The next beacon frame (or trigger frame) may be received by switching to an awake state at a transmission time (or next TWT start time) of the beacon frame.
  • FIG. 4 is a conceptual diagram illustrating a block ACK frame according to an embodiment of the present invention.
  • An information unit including a plurality of status indicators for each of the plurality of STAs may also be expressed as a term of a status indication field.
  • the BA information field 450 may sequentially include ACK / NACK information for each of the plurality of STAs, and is a reserved field 400 included in the BS control field 430. May include each of the plurality of status indicators for each of the plurality of STAs in the same order of ACK / NACK information for each of the plurality of STAs included in the BA information field 450.
  • the BA information field 450 sequentially includes ACK / NACK information for STA1, ACK / NACK information for STA2, ACK / NACK information for STA3, and ACK / NACK information for STA4, it is preserved.
  • the indicated field may sequentially include a status indicator for STA1, a status indicator for STA2, and a status indicator for STA3.
  • FIG. 5 is a conceptual diagram illustrating a block ACK frame according to an embodiment of the present invention.
  • FIG. 5 a method of transmitting status indicators for a plurality of STAs in group units using the preserved field 500 is disclosed.
  • information about a state during a current beacon interval of a plurality of STAs receiving a block ACK frame using one bit among a plurality of bits constituting the preserved field 500 may be transmitted.
  • the AP does not indicate the maintenance of the individual awake state or the transition to the doze state of the plurality of STAs that have received the block ACK frame, and maintains the awake state on the current beacon intervals of the plurality of STAs overall through the preserved field 500. Or a switch to the doze state.
  • 1 bit of the preserved field is defined as a status indicator, and the value of the status indicator is 1, all of the plurality of STAs receiving the block ACK frame remain in an awake state, and a trigger frame scheduled within the current beacon interval is generated. Can be received. On the contrary, when the value of the status indicator is 0, all of the plurality of STAs receiving the block ACK frame are switched to the doze state after receiving the block ACK frame, and are switched to the awake state at the time of transmission of the next beacon frame. Can be.
  • the AP when the AP wants to transmit a trigger frame scheduled within the current beacon interval to at least one or more of the plurality of STAs receiving the block ACK frame, the AP sets the value of the status indicator of the preserved field 500 to 1.
  • the configured block ACK frame can be transmitted.
  • the AP when the AP does not transmit a trigger frame scheduled within the current beacon interval to any of a plurality of STAs receiving the block ACK frame, the AP sets the value of the state indicator of the preserved field 500 to 0. You can send a frame.
  • the STA may determine whether to maintain an awake state or switch to a doze state based on the 1-bit state indicator included in the preserved field 500. When the value of the status indicator is 1, the STA may maintain the awake state and monitor whether the scheduled trigger frame is transmitted within the current beacon interval.
  • the STA may be switched to the doze state and then switched to the awake state at the time of transmission of the next beacon frame to receive the next beacon frame.
  • the next beacon frame may include information on the target transmission time of the scheduled trigger frame.
  • FIG. 6 is a conceptual diagram illustrating a block ACK frame according to an embodiment of the present invention.
  • FIG. 6 illustrates a method of transmitting a status indicator for a STA through bits included in a block ACK bitmap field included in a block ACK information field included in a BA information field.
  • 1 bit included in the block ACK bitmap field of the block ACK information field 600 which is a UE-specific field (or STA specific field) is information on which state the STA operates. Can be indicated.
  • the block ACK information field 600 may include each of the plurality of block ACK bitmap fields 610, 620, and 630 including ACK / NACK information for each of the plurality of STAs.
  • Each of the plurality of block ACK bitmap fields 610, 620, and 630 may include a state indicator for each of the plurality of STAs.
  • the block ACK information field 600 includes a block ACK bitmap field 1 610 for STA1, a block ACK bitmap field 2 620 for STA2, and a block ACK bitmap field 3 630 for STA3.
  • Each may include.
  • one bit among the plurality of bits constituting the block ACK bitmap field 1 610 for STA1 is used as a status indicator for STA1 and a plurality of bits constituting the block ACK bitmap field 2 620 for STA2.
  • One bit among the bits may be used as a status indicator for STA2, and one bit among the plurality of bits constituting the block ACK bitmap field 3 630 for STA3 may be used as a status indicator for STA3.
  • the STA may determine whether to maintain an awake state or switch to a doze state based on a 1-bit state indicator included in the block ACK bitmap field of the STA.
  • the STA may maintain the awake state and monitor whether the scheduled trigger frame is transmitted in the current beacon interval period. If the value of the status indicator is 0, the STA may be switched to the doze state and then switched to the awake state at the time of transmission of the next beacon frame to receive the next beacon frame.
  • the next beacon frame may include information on the target transmission time of the scheduled trigger frame.
  • each of the plurality of block ACK bitmap fields for ACK / NACK information corresponding to the plurality of TIDs is transmitted.
  • the included state indicator may be set to have the same value.
  • FIG. 7 is a conceptual diagram illustrating a trigger frame transmission method according to an embodiment of the present invention.
  • FIG. 7 a method is disclosed in which an AP transmits information on a transmission time of a scheduled trigger frame through a block ACK frame.
  • the AP may transmit information on a transmission time of a scheduled trigger frame based on a bit value of a reserved field included in a block ACK frame.
  • the AP determines whether to maintain the doze transition / awake state and the scheduled trigger frame through 8 bits corresponding to the preserved field 750 included in the BA control field 700 of the block ACK frame.
  • Information about the transmission time can be transmitted.
  • the preserved field having a value of '00000000' may indicate maintenance of the awake state of the STA at the current beacon interval.
  • the preserved field 750 having a value of '11111111' may indicate the transition from the current beacon interval to the doze state of the STA and the awake state on the next beacon frame interval.
  • a reserved field having a value of '00000001 to 11111110' may indicate a target transmission time of a scheduled trigger frame.
  • the time unit for determining the target transmission time of the scheduled trigger frame may be preset.
  • the transmission time of the scheduled trigger frame may be determined based on the information and the time unit indicated by the preserved field 750.
  • the unit for indicating the transmission time of the scheduled trigger frame may be set differently according to the beacon interval.
  • a plurality of STAs that receive the block ACK frame using a value set based on the preserved field 750 may operate in the same state during the current beacon interval.
  • information on whether the doze state is maintained / switched awake and the transmission time of the scheduled trigger frame based on the bits constituting the block ACK bitmap field of the BA information field, which is a user-specific area of the block ACK frame. May be sent.
  • x bits x is any positive number
  • LSB x bits LSB (least significant bit) in the block ACK bitmap field
  • the LSB x bit having a value of '00000000' may indicate maintenance of the awake state of the STA in the current beacon interval.
  • the LSB x bit having a value of '11111111' may indicate re-transition to the awake state on the next beacon frame interval after the switch to the doze state of the STA.
  • An LSB x bit having a value of '00000001 to 11111110' may indicate a transmission time of a scheduled trigger frame.
  • the unit for indicating the transmission time of the scheduled trigger frame may be set in advance.
  • the transmission time of the scheduled trigger frame may be determined based on the information in the LSB x bits and the time unit.
  • the unit for indicating the transmission time of the scheduled trigger frame may be set differently according to the beacon interval.
  • a plurality of STAs receiving the block ACK frame may operate in the same state during the current beacon interval.
  • information on whether the doze state is maintained / switched in the doze state and the transmission time of the scheduled trigger frame may be transmitted through the HE A-control field included in the block ACK frame.
  • the STA may transmit an uplink frame for the BSR to the AP based on the random access trigger frame and receive a block ACK frame for the uplink frame. Based on the above-described various methods, information on the operation state of the STA and / or the target transmission time of the scheduled trigger frame may be transmitted through the block ACK frame.
  • the operation of the STA and the AP informs the reception of the next beacon frame through the block ACK frame.
  • Each operation of the STA is disclosed.
  • the AP may not transmit the scheduled trigger frame or the STA may fail to receive the scheduled trigger frame sent by the AP.
  • a specific STA that has transmitted the BSR information may not be allocated a resource for the transmission of the uplink data frame (or BSR information The transmitted specific STA may not be scheduled based on the scheduled trigger frame).
  • a specific STA that has transmitted BSR information for scheduling for a STA having a higher scheduling priority may not be scheduled based on a scheduled trigger frame. That is, the AP may not schedule uplink transmission resources for the STA that transmitted the uplink frame including the BSR at the target transmission time of the scheduled trigger frame.
  • the STA may not receive the scheduled trigger frame due to a channel condition.
  • the STA may receive a random access trigger frame and transmit an uplink frame including BSR information to the AP based on the random access trigger frame.
  • the AP may transmit a block ACK frame in response to an uplink frame including BSR information, and the block ACK frame may include information about an operation state of the STA and / or a target transmission time of the scheduled trigger frame.
  • the STA may receive information on the target transmission time of the scheduled trigger frame, and may be switched to an awake state based on the information on the target transmission time to receive the scheduled trigger frame.
  • the STA switched to the awake state may wait for transmission of a scheduled trigger frame to be transmitted by the AP during the set waiting time.
  • Information about the wait time waiting for transmission of the scheduled trigger frame may be transmitted or received through an initial access procedure (scanning procedure / authentication procedure / combination procedure) of the AP and any STA (eg, beacon frame, probe request). Frame / probe response frame).
  • the waiting time may be set to a predetermined specific value according to a lifetime (or valid time) or an access category (AC) of uplink data to be transmitted by the STA.
  • the STA may not receive the scheduled trigger frame from the AP until the timer set for the waiting time expires after switching to the awake state for the reception of the scheduled trigger frame.
  • the STA may retransmit an uplink frame including BSR information to the AP based on the random access trigger frame.
  • the AP receiving the uplink frame including the retransmitted BSR information may replace the existing BSR information with the retransmitted BSR information.
  • the AP transmits a scheduled trigger frame before the timer set for the waiting time expires, but the AP does not receive an uplink data frame based on the scheduled trigger frame from the STA, the AP expires the timer set for the waiting time.
  • Previously scheduled trigger frames may be retransmitted to the STA.
  • the STA that receives the trigger frame scheduled from the AP before the expiration of the timer configured for the wait time may reset the timer configured for the wait time again.
  • the STA When the STA receives the scheduled trigger frame but the AP does not receive the uplink data frame transmitted through the uplink resource by the STA or when the STA does not receive the block ACK frame for the transmitted uplink data frame.
  • the operation of the STA is started (when an error occurs in the block ACK frame transmitted by the AP or the ACK / NACK information for the STA is not included in the block ACK frame).
  • the STA Upon receiving the scheduled trigger frame, the STA compares the amount of buffered uplink data transmitted through the transmitted BSR information with the amount of resources allocated through the scheduled trigger frame to reconstruct the resource for uplink transmission of the STA of the AP. Know whether it's assigned.
  • a trigger frame is transmitted to allocate uplink resources for a specific AC
  • the STA may monitor the next scheduled trigger frame to be transmitted by the AP to the STA, and when the next scheduled trigger frame is transmitted, the STA may retransmit uplink data through the scheduled resource based on the next scheduled trigger frame.
  • the STA may indicate that the uplink data frame is a retransmitted data frame by setting a retry bit of the retransmitted uplink data frame to 1.
  • the AP that receives the uplink data frame with the retry bit set to 1 may know that the STA has performed retransmission.
  • the AP schedules in consideration of the amount of buffered uplink data remaining except for the size of uplink data included in the uplink data frame transmitted from the size of the buffered uplink data of the STA indicated by the BSR information of the STA.
  • An uplink resource may be allocated through the trigger frame.
  • the scheduled trigger frame is additionally transmitted by the AP.
  • Uplink resources for the STA may not be rescheduled.
  • the STA may perform random access again based on the random access trigger frame to transmit an uplink frame including the BSR information to the AP.
  • the uplink frame including the BSR information may include information on transmission failure of a previous uplink data frame of the STA.
  • the STA transmits an uplink data frame to the AP based on the scheduled trigger frame, and the STA receives the block ACK frame from the AP, the STA does not include the ACK / NACK information for the STA in the block ACK frame.
  • Random access may be performed again based on the random access trigger frame to transmit an uplink frame including the BSR information to the AP.
  • the uplink frame including the BSR information may include information on transmission failure of a previous uplink data frame of the STA (or information on the presence of a buffered uplink which has failed to be transmitted at present).
  • the scheduled trigger frame transmitted by the AP to the STA is allocated an uplink resource.
  • the transmission information may include retransmission request information (or retransmission request indicator) indicating that the resource is a resource for requesting retransmission of the previously transmitted uplink data.
  • the scheduled trigger frame transmitted by the AP to the STA may include retransmission request information (or retransmission request indicator) requesting retransmission of uplink data to the STA.
  • the STA may know that the AP has not received the previously transmitted uplink data, and retransmits the previously transmitted uplink data to the AP. can do.
  • the retransmission request information (or retransmission request indicator) is included in a signal field (eg SIG (signal) -A / B / C, etc.) of a medium access control (MAC) header or a PHY protocol data unit (PPDU) header. May be sent.
  • MAC medium access control
  • PPDU PHY protocol data unit
  • retransmission request information may be defined as a specific field in the payload of the scheduled trigger frame.
  • the STA may retransmit BSR information. If the STA transmits uplink data but does not receive the ACK frame, the STA performs random access based on the random access trigger frame or BSR through contention-based channel access based on enhanced distributed channel access (EDCA). Information can be sent to the AP.
  • EDCA enhanced distributed channel access
  • the STA When the STA is instructed to receive the next beacon frame based on the ACK frame transmitted by the AP, the STA may be switched to an awake state at the time of transmission of the next beacon frame to monitor transmission of the next beacon frame.
  • the STA may switch to the awake state and maintain the awake state if the next beacon frame is not received for a predetermined specific time.
  • the STA may not have information about the target transmission time of the scheduled trigger frame for scheduling uplink resources for the STA.
  • the STA may determine that there is no downlink data for the STA buffered in the AP based on the traffic indication map (TIM) element included in the next beacon frame, and may switch to the doze state.
  • the STA may be switched to the awake state at the time of transmission of the beacon frame transmitted after the next beacon frame to receive the beacon frame.
  • the STA may transmit an uplink frame including BSR information to the AP again in an awake state.
  • a block ACK frame transmitted to an STA that transmits an uplink frame including BSR information based on a random access trigger frame is disclosed.
  • This is for convenience of explanation and an uplink data frame based on an orthogonal frequency division multiplexing (OFDMA) based ACK frame, an E-ACK, etc., which is transmitted to an STA transmitting an uplink frame based on a random access trigger frame.
  • OFDMA orthogonal frequency division multiplexing
  • the embodiment of the present invention discloses a case in which the information on the target transmission time of the scheduled trigger frame or the target transmission time of the beacon frame is transmitted through the ACK frame transmitted by the AP in response to the uplink frame. It became.
  • the present invention may be applicable to a case in which the target transmission time of the trigger frame is notified through the beacon frame and the STA is switched to an awake state at the target transmission time and thus does not receive the trigger frame.
  • FIG. 8 is a conceptual diagram illustrating a DL MU PPDU format according to an embodiment of the present invention.
  • the random access trigger frame, the scheduled trigger frame, and the block ACK may be delivered to the plurality of STAs through the data field of the DL MU PPDU format.
  • 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).
  • efficiency-signal A), high efficiency-signal-B (HE-SIG B), high efficiency-short training field (HE-STF), high efficiency-long training field (HE-LTF), data field (or MAC payload ) May be included.
  • From the PHY header to the L-SIG may be classified into a legacy part and a high efficiency (HE) part after the L-SIG.
  • the L-STF 800 may include a short training orthogonal frequency division multiplexing symbol.
  • the L-STF 800 may be used for frame detection, automatic gain control (AGC), diversity detection, and coarse frequency / time synchronization.
  • AGC automatic gain control
  • the L-LTF 810 may include a long training orthogonal frequency division multiplexing symbol. L-LTF 810 may be used for fine frequency / time synchronization and channel prediction.
  • L-SIG 820 may be used to transmit control information.
  • the L-SIG 820 may include information about a data rate and a data length.
  • the HE-SIG A 830 may include information for indicating an STA to receive the DL MU PPDU.
  • the HE-SIG A 830 may be an indicator indicating whether the transmitted PPDU is DL transmission or UL transmission, an identifier of a specific STA (or AP) to receive the PPDU, and information for indicating a group of the specific STA. It may include.
  • the HE-SIG A 830 may also include resource allocation information for receiving the DL MU PPDU of the STA.
  • the HE-SIG A 830 may include color bit information, bandwidth information, transmission opportunity (TXOP) duration information, tail bits, CRC bits, and HE-SIG for BSS identification information. It may also include modulation and coding scheme (MCS) information for the B 840, symbol number information for the HE-SIG B 840, and cyclic prefix (CP) (or guard interval (GI)) length information.
  • MCS modulation and coding scheme
  • CP cyclic prefix
  • GI guard interval
  • the HE-SIG A 830 may have a repetition mode for transmission range extension. If a repetitive mode is used in the HE-SIG A 830, the use of the repetitive mode may be indicated prior to the HE-SIG A 830. In the repeat mode, the HE-SIG A 830 may be repeated once. The bit interleaver may be bypassed in repeated HE-SIG A symbols.
  • the HE-SIG B 840 may include information about a length MCS of a physical layer service data unit (PSDU) for each STA, tail bits, and the like. In addition, the HE-SIG B 840 may include information on an STA to receive the PPDU, and resource allocation information (or MU-MIMO information) based on OFDMA. If the HE-SIG B 840 includes OFDMA-based resource allocation information (or MU-MIMO related information), the HE-SIG A 830 may not include resource allocation information.
  • PSDU physical layer service data unit
  • the previous field of the HE-SIG B 840 on the DL MU PPDU may be transmitted in duplicated form in each of different transmission resources.
  • the HE-SIG B 840 transmitted in some resource units eg, resource unit 1 and resource unit 2 is an independent field including individual information, and the remaining resources.
  • the HE-SIG B 840 transmitted in a unit eg, resource unit 3 and resource unit 4 is an HE-SIG B 840 transmitted in another resource unit (eg, resource unit 1, resource unit 2). ) May be in a format duplicated.
  • the HE-SIG B 840 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 840 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.
  • 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 840.
  • Each of the plurality of user blocks included in the HE-SIG B 840 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.
  • HE SIG B1 transmitted in resource unit 1 may include a general block and a user block for STA 1 and STA2
  • HE SIG B2 transmitted in resource unit 2 may include a general block for STA 3 and STA4 and It may include a 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 may be the HE SIG transmitted in the resource unit 1. It can be generated by duplication of B2.
  • the HE-STF 850 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 860 may be used to estimate a channel in a MIMO environment or an OFDMA environment.
  • the size of the IFFT applied to the fields after the HE-STF 850 and the HE-STF 850 and the size of the IFFT applied to the field before the HE-STF 850 may be different.
  • the size of the IFFT applied to the fields after the HE-STF 850 and the HE-STF 850 may be four times larger than the size of the IFFT applied to the field before the HE-STF 850.
  • the STA may receive the HE-SIG A 830 and may be instructed to receive the downlink PPDU based on the HE-SIG A 830.
  • the STA may perform decoding based on the changed FFT size from the field after the HE-STF 850 and the HE-STF 850.
  • the STA may stop decoding and configure a network allocation vector (NAV).
  • NAV network allocation vector
  • the cyclic prefix (CP) of the HE-STF 850 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 downlinks) for each of the plurality of STAs through each of the plurality of resource units to each of the plurality of STAs.
  • Link frame can be transmitted.
  • 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 850 or the HE-SIG B 860 as described above.
  • FIG. 9 is a conceptual diagram illustrating transmission of an UL MU PPDU according to an embodiment of the present invention.
  • a plurality of STAs may transmit a UL MU PPDU to an AP based on UL MU OFDMA.
  • the data field 970 of the UL MU PPDU may include uplink data (or uplink frame) triggered by a trigger frame.
  • the AP may receive a plurality of UL frames transmitted by a plurality of STAs through a plurality of UL MU PPDUs transmitted on overlapping time resources.
  • the uplink frame including the BSR triggered and transmitted by the aforementioned random access trigger frame and the uplink data frame triggered and transmitted by the scheduled trigger frame may be transmitted through the UL MU PPDU.
  • the L-STF 900, the L-LTF 910, the L-SIG 920, the HE-SIG A 930, and the HE-SIG B 940 may perform the roles disclosed in FIG. 8.
  • Information included in the signal field (L-SIG 920, HE-SIG A 930, HE-SIG B 940) may be generated based on information included in the signal field of the received DL MU PPDU. .
  • the STA1 may perform uplink transmission through the entire bandwidth up to the HE-SIG B 940 and uplink transmission through the allocated bandwidth after the HE-STF 950.
  • the STA1 may transmit an uplink frame based on the UL MU PPDU through the allocated bandwidth (eg, resource unit 1).
  • the AP may allocate uplink resources of each of a plurality of STAs based on a DL MU PPDU (eg, HE-SIG A / B), and each of the plurality of STAs is allocated an uplink resource and transmits a UL MU PPDU. Can be.
  • FIG. 10 is a block diagram illustrating a wireless device to which an embodiment of the present invention can be applied.
  • the wireless device may be an AP 1000 or a non-AP station (or STA) 1050 that may implement the above-described embodiment.
  • the AP 1000 includes a processor 1010, a memory 1020, and an RF unit 1030.
  • the RF unit 1030 may be connected to the processor 1010 to transmit / receive a radio signal.
  • the processor 1010 may implement the functions, processes, and / or methods proposed in the present invention.
  • the processor 1010 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 embodiments of FIGS. 1 to 9.
  • the processor 1010 may transmit a beacon frame including information on the target transmission time of the random access trigger frame.
  • the processor 1010 transmits a random access trigger frame based on a DL MU transmission, receives a plurality of uplink frames including BSR information (or buffer status information) from the plurality of STAs, and blocks the plurality of STAs. It may be implemented to transmit an ACK frame.
  • the block ACK frame may include a status indication field, and the status indication field may indicate whether each of the plurality of STAs transitions to a doze state or receives an scheduled trigger frame while maintaining an awake state within a current beacon frame interval. Can be.
  • the processor 1010 may be implemented to transmit a trigger frame scheduled to a plurality of STAs instructing to maintain the awake state based on the DL MU transmission based on the status indication field.
  • the scheduled trigger frame may include identification information of a plurality of STAs to be transmitted of the uplink data frame and information about an uplink transmission resource for an uplink data frame to be transmitted by the plurality of STAs.
  • the STA 1050 includes a processor 1060, a memory 1070, and a radio frequency unit 1080.
  • the RF unit 1080 may be connected to the processor 1060 to transmit / receive a radio signal.
  • the processor 1060 may implement the functions, processes, and / or methods proposed in the present invention.
  • the processor 1060 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 9.
  • the processor 1060 may transmit an uplink frame including buffer status information based on a random access trigger frame transmitted by an access point (AP), and block acknowledgment for the uplink frame from the AP.
  • the block ACK frame may include a status indication field.
  • the processor 1060 may be implemented to determine whether to maintain an awake state or switch to a doze state on the remaining section of the current beacon interval based on the status indication field.
  • a random access trigger frame triggers UL uplink multi-user (MU) transmission to an AP based on random access of a plurality of STAs including the STA, and a status indication field maintains the awake state of each of the plurality of STAs. It may include information on whether or not to switch to the doze state.
  • MU uplink multi-user
  • the processor 1060 monitors the scheduled trigger frame transmitted by the AP on the remaining section of the current beacon interval, receives the scheduled trigger frame, and receives the scheduled trigger frame. It can be implemented to transmit an uplink data frame to the AP in response.
  • the scheduled trigger frame may trigger scheduled UL MU transmission to the AP of each of the plurality of STAs including the STA.
  • the block ACK frame may further include information on a target transmission time of the scheduled trigger frame.
  • the processor 1060 determines to switch the doze state, the processor 1060 maintains the doze state on the remaining sections, and switches from the doze state to the awake state based on the transmission time of the beacon frame transmitted after the remaining sections are expired.
  • the scheduled trigger frame may trigger scheduled UL MU transmission of each of a plurality of STAs including the STA to the AP.
  • the processor 1060 receives the beacon frame, wherein the beacon frame includes information on the target transmission time of the random access trigger frame, and after receiving the beacon frame, transition from the awake state to the doze state, and the dose until the target transmission time Maintain state, transition from the doze state to the awake state based on the target transmission time, and receive the random access trigger frame transmitted at the target transmission time.
  • Processors 1010 and 1060 may include application-specific integrated circuits (ASICs), other chipsets, logic circuits, data processing devices and / or converters to convert baseband signals and wireless signals to and from each other.
  • the memories 1020 and 1070 may include read-only memory (ROM), random access memory (RAM), flash memory, memory cards, storage media and / or other storage devices.
  • the RF unit 1030 and 1080 may include one or more antennas for transmitting and / or receiving a radio signal.
  • the above-described technique may be implemented as a module (process, function, etc.) for performing the above-described function.
  • the module may be stored in the memory 1020, 1070 and executed by the processor 1010, 1060.
  • the memories 1020 and 1070 may be inside or outside the processors 1010 and 1060, and may be connected to the processors 1010 and 1060 by various well-known means.

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  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un procédé et un dispositif pour régler un état d'une station (STA) fonctionnant dans un mode d'économie d'énergie dans un intervalle de balise. Le procédé pour régler un état d'une STA fonctionnant dans un mode d'économie d'énergie dans un intervalle de balise peut comprendre les étapes consistant : à transmettre, par la STA, une trame de liaison montante comprenant des informations d'état de mémoire tampon, sur la base d'une trame de déclenchement d'accès aléatoire transmise par un point d'accès (AP); et à recevoir, par la STA, une trame d'accusé de réception (ACK) de bloc pour la trame de liaison montante à partir de l'AP, la trame ACK de bloc comprenant un champ d'indication d'état, et à déterminer, par la STA, s'il faut maintenir un état actif ou commuter vers un état inactif dans une section restante d'un intervalle de balise courant, sur la base du champ d'indication d'état, la trame de déclenchement d'accès aléatoire pouvant déclencher une transmission multi-utilisateur (MU) de liaison montante (UL) à l'AP sur la base d'accès aléatoires d'une pluralité de STA comprenant la STA, et le champ d'indication d'état pouvant comprendre des informations sur le point de savoir s'il faut maintenir un état actif ou commuter vers un état inactif pour chacune de la pluralité de STA.
PCT/KR2016/001584 2015-06-30 2016-02-17 Procédé et dispositif pour régler un état d'une sta fonctionnant dans un mode d'économie d'énergie dans un intervalle de balise Ceased WO2017003062A1 (fr)

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WO2020013597A1 (fr) * 2018-07-10 2020-01-16 엘지전자 주식회사 Procédé pour la transmission et la réception d'un signal sur la base d'un mode ps dans un système lan sans fil, et appareil associé

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