WO2015190779A1 - 무선랜 시스템에서 상향링크 다중 사용자 전송 방법 및 이를 위한 장치 - Google Patents
무선랜 시스템에서 상향링크 다중 사용자 전송 방법 및 이를 위한 장치 Download PDFInfo
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- WO2015190779A1 WO2015190779A1 PCT/KR2015/005715 KR2015005715W WO2015190779A1 WO 2015190779 A1 WO2015190779 A1 WO 2015190779A1 KR 2015005715 W KR2015005715 W KR 2015005715W WO 2015190779 A1 WO2015190779 A1 WO 2015190779A1
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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
- H04L27/2601—Multicarrier modulation systems
- H04L27/2602—Signal structure
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0091—Signaling for the administration of the divided path
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0006—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission format
- H04L1/0007—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission format by modifying the frame length
- H04L1/0008—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission format by modifying the frame length by supplementing frame payload, e.g. with padding bits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/1607—Details of the supervisory signal
- H04L1/1664—Details of the supervisory signal the supervisory signal being transmitted together with payload signals; piggybacking
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1867—Arrangements specially adapted for the transmitter end
- H04L1/1887—Scheduling and prioritising arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0044—Arrangements for allocating sub-channels of the transmission path allocation of payload
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- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0058—Allocation criteria
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0091—Signaling for the administration of the divided path
- H04L5/0092—Indication of how the channel is divided
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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
- H04W28/0278—Traffic management, e.g. flow control or congestion control using buffer status reports
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- H04W72/00—Local resource management
- H04W72/12—Wireless traffic scheduling
- H04W72/1263—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows
- H04W72/1268—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows of uplink data flows
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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
- H04L27/2601—Multicarrier modulation systems
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0037—Inter-user or inter-terminal allocation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
- H04L5/0055—Physical resource allocation for ACK/NACK
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- H—ELECTRICITY
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- 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]
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/08—Access point devices
Definitions
- the following description relates to a method and an apparatus therefor for efficiently performing uplink multi-user transmission in a WLAN system.
- IEEE 802.11a and b are described in 2.4. Using unlicensed band at GHz or 5 GHz, IEEE 802.11b provides a transmission rate of 11 Mbps, and IEEE 802.11a provides a transmission rate of 54 Mbps.
- IEEE 802.11 provides orthogonal frequency division multiplexing (OFDM) at 2.4 GHz and provides a transmission rate of 54 Mbps.
- IEEE 802.11 ⁇ applies multiple input and output multiple out put (OFDM, MIM0-0FDM), and provides a transmission rate of 300 Mbps for four spatial streams.
- ⁇ 802 ⁇ 11 ⁇ supports channel bandwidth up to 40 MHz, in this case 600 Mbps.
- the above-mentioned WLAN standard uses the maximum bandwidth of 160MHz, supports the 8 spatial streams, and supports the IEEE 802.11lac standard that supports the speed of up to lGbit / s. have.
- the present invention intends to propose an efficient multi-user transmission method from a non-AP STA to an AP in a WLAN system.
- a method of receiving an AP from an STA in a WLAN system in a WLAN system wherein the STA includes a plurality of STAs. Transmits a downlink multi-user frame to each other, and transmits an uplink frame including an acknowledgment signal (ACK / NACK) and an uplink scheduling request signal for the downlink multi-user frame from two or more of the STAs; Receiving, transmitting a downlink frame including uplink scheduling information to the two or more STAs based on the uplink scheduling request signal, and including data from the two or more STAs.
- a method for receiving uplink multi-user frame wherein the SIG field of the downlink frame includes a first indicator indicating that the downlink frame includes uplink multi-user scheduling information. .
- the GID and the partial AID of the downlink frame may have a combination of a specific value.
- the SIG field of the downlink frame may include a specific bit indicating that the downlink frame is a frame for transmitting the uplink multi-user scheduling information.
- the downlink frame includes the uplink multi-user scheduling information
- the downlink frame one ID field for identification of the AP, a plurality of STAs for identifying the two or more STAs; Identification ID fields, resource allocation fields for allocating uplink resources to each of the two or more STAs, and control fields for an uplink data transmission scheme of each of the two or more STAs may be included.
- the uplink multi-user frame is preferably received after a predetermined time after receiving the downlink frame including the uplink scheduling information.
- the AP after receiving an uplink frame including the uplink scheduling request signal, the AP receives transmission start time information of a downlink frame including the acknowledgment response signal for the uplink frame and the uplink scheduling information. Transmitting an additional downlink frame including; A downlink frame including the uplink scheduling information may be transmitted at a time.
- the downlink multi-user frame may include a second indicator to trigger the phase-based uplink scheduling request signal is transmitted to the plurality of STA, the second indication that the uplink scheduling request signal
- the plurality of STAs may receive an uplink frame including the uplink scheduling request signal from the plurality of STAs.
- the uplink multi-user frame may further include a reception acknowledgment signal for a downlink frame including the uplink scheduling information and a subsequent uplink scheduling request signal. Subsequently, uplink scheduling information may be included in a downlink multi-user frame that is subsequently transmitted in response to a subsequent uplink scheduling request signal.
- the downlink frame including the uplink scheduling information may include a null subframe in the last predetermined number of subframes.
- the AP may transmit a delay notification frame after a predetermined time after transmitting the downlink frame including the uplink scheduling information, and the two or more STAs after the predetermined time after transmitting the delay notification frame.
- the uplink multi-user frame may be received from.
- the downlink frame including the uplink scheduling information may further include a third indicator indicating whether the delay notification frame exists.
- a station transmits data in a multi-user transmission scheme to an APCAccess Point in a WLAN 0VLAN) system.
- the method includes: receiving a downlink multi-user frame from the AP, and transmitting an uplink frame including an acknowledgment signal (ACK / NACK) and an uplink scheduling request signal for the downlink multi-user frame to the AP; And receiving a downlink frame including uplink scheduling information from the AP, and transmitting an uplink multi-user frame including data corresponding to the uplink scheduling information, wherein the SIG field of the downlink frame is An uplink multi-user data transmission method including a first indicator indicating that a downlink frame includes uplink multi-user scheduling information is proposed.
- an AP (Access Pont) device configured to receive data from a plurality of stations (STA) in a WLAN (WLAN) system, the plurality of STAs and downlinks
- a transceiver configured to transmit and receive multi-user frames and uplink multi-user frames
- a processor connected to the transceiver and controlling an operation of the transceiver, wherein the processor includes: an acknowledgment signal for a downlink multi-user frame transmitted from two or more of the STAs through the transceiver; ACK / NACK) and when an uplink frame including an uplink scheduling request signal is received, a downlink frame including uplink scheduling information is transmitted to the two or more STAs based on the uplink scheduling request signal.
- the SIG field of the downlink frame includes a first indicator indicating that the downlink frame includes uplink multi-user scheduling information.
- a WLAN system A station (STA) device configured to transmit data to a AP in a multi-user transmission manner
- the apparatus comprising: receiving a downlink multi-user frame from the AP and transmitting an uplink multi-user frame to the AP Configured transceiver; And a processor connected to the transceiver to control an operation of the transceiver, wherein the processor, when receiving the downlink multi-user frame from the AP, receives an acknowledgment signal for the downlink multi-user frame.
- the uplink scheduling Transmit the uplink multi-user frame including data in response to information, wherein the SIG field of the downlink frame includes a first indicator indicating that the downlink frame includes uplink multi-user scheduling information; Propose station equipment.
- FIG. 1 illustrates an example of a configuration of a wireless LAN system.
- FIG. 2 is a diagram illustrating another example of the configuration of a WLAN system.
- FIG. 3 shows an example of a frame format usable in a new standard to which the present invention is applied.
- 4 illustrates an example of a format of a UL MU scheduling frame according to an embodiment of the present invention.
- FIG. 5 is a diagram for explaining an example of configuring an UL MU scheduling frame by changing an existing CTS frame according to another embodiment of the present invention.
- FIG. 6 is a diagram for describing a method of an AP performing UL MU scheduling to a plurality of STAs according to an embodiment of the present invention.
- FIG. 7 shows a UL for a plurality of STAs according to another embodiment of the present invention.
- FIG. 4 illustrates a case of delayed transmission of an MU scheduling frame.
- FIG 8 and 9 illustrate a case in which a signal for requesting BSR transmission is included in a DL MU frame transmitted by an AP according to another embodiment of the present invention.
- FIG. 10 illustrates a case in which a UL MU scheduling frame is piggybacked on a DL MU frame transmitted by an AP according to another embodiment of the present invention.
- FIG. 11 illustrates an initial transmission by an AP according to another embodiment of the present invention.
- FIG. 4 illustrates a case in which a UL MU scheduling frame is piggybacked from a DL MU frame.
- FIG. 12 is a view for explaining another aspect of the present invention in UL MU Tx.
- FIG. 13 illustrates UL MU scheduling transmitted by ⁇ according to an embodiment of the present invention
- FIG. 14 illustrates UL MU scheduling according to another embodiment of the present invention.
- FIG. 4 illustrates a method of transmitting a P-delay frame after transmitting an A-MPDU frame.
- 15 to 18 are diagrams exemplarily illustrating various forms of a P-delay frame.
- FIG. 19 is a diagram illustrating a case of using a P-delay frame according to another embodiment of the present invention.
- FIG. 20 is a diagram illustrating an apparatus for implementing a method according to the present invention.
- the following description relates to a method for efficiently performing uplink multi-user transmission in a WLAN system and an apparatus therefor.
- a WLAN system to which the present invention is applied will be described in detail.
- the WLAN system includes one or more basic service sets (BSSs).
- BSS is a set of stations (Stations, STAs) that can successfully synchronize and communicate with each other.
- An STA is a logical entity that includes a medium access control (MAC) and a physical layer interface to a wireless medium.
- An STA is a non-AP STA and a non-AP STA.
- AP Stat ion The portable terminal operated by the user among the STAs is a non-AP STA, and when referred to simply as an STA, it may also refer to a non-AP STA.
- Non-AP STAs include terminals, wireless transmit / receive units (WTRUs), user equipment (UE), mobile stations (Mobi le Stat ion, MS), and mobile terminals (Mobi le Terminal). May also be called other names, such as Mobile Subscriber Unit. ⁇
- the AP is an entity that provides access to a Distribution System (DS) through an associated Station (Wl) wireless medium associated with the AP, which is a centralized controller and a base station (BS).
- DS Distribution System
- Wl Station
- BS base station
- Node-B BTS (Base
- Transceiver System a Transceiver System
- site controller a site controller
- IBSS BSS
- the BBS shown in FIG. 1 is an IBSS. Since IBSS means BSS that does not include AP and does not include ⁇ , access to DS is not allowed, thus forming a self-contained network.
- FIG. 2 is a diagram illustrating another example of the configuration of a WLAN system.
- the BSS shown in FIG. 2 is an infrastructure BSS.
- Infrastructure BSS One or more STAs and APs.
- communication between non-AP STAs is performed via an AP, but when direct link (l ink) is established between non-AP STAs, direct communication between non-AP STAs is also possible.
- a plurality of infrastructure BSSs may be interconnected through a DS.
- Extended service set of multiple BSSs connected through DS may be interconnected through a DS.
- ESS Extended Service Set
- STAs included in the ESS may communicate with each other, and a non-AP STA may move from one BSS to another BSS while communicating seamlessly within the same ESS.
- the DS is a mechanism for connecting a plurality of APs.
- the DS is not necessarily a network, and there is no limitation on the form if it can provide a predetermined distribution service.
- the DS may be a wireless network such as a mesh network or a physical structure that connects APs to each other. Based on the above description, a multi-user transmission scheme in a different WLAN system according to the present invention will be described.
- the 'uplink scheduling request signal' is a signal for the STA to request resources for transmitting data to the AP, and may have a bandwidth request (BW-REQ) form or a buffer status report (Buf fer St atus Report). May be in the form of BSR).
- BSR bandwidth request
- Buf fer St atus Report a buffer status report
- BSR is used as an 'uplink scheduling request signal' unless otherwise specified.
- BSR is an STA Assume a frame for reporting the scene buffer state (eg queue size, connection category, etc.).
- MU Tx multi-user transmission
- the AP may simultaneously transmit data to a plurality of users (STAs) through the same channel / subchannel or different channels / subchannels.
- STAs users
- the plurality of STAs may simultaneously transmit data to the AP through the same channel / subchannel or another channel / subchannel.
- STAs implicitly (eg, based on SIFS) or explicitly (eg, UL) transmission start time for STAs to simultaneously transmit data.
- the AP when the AP receives a BSR from STAs, the AP receives a UL MU scheduling frame (DL frame including UL MU scheduling information) from the STAs in consideration of the BSR. Can be set to transmit.
- STAs receive a triggering frame such as the UL MU scheduling frame, and their own address (for example, AID / PAID, etc.) is included in the corresponding frame, the corresponding STA may transmit the UL frame to the AP at a given time. .
- the time given here is UL MU It may be a fixed time (eg, SIFS / PIFS) after receiving the scheduling frame, or alternatively, it may be a time indicated by the UL MU scheduling frame. If the UL MU frame is set to be transmitted at a fixed time, signaling overhead can be reduced because there is no need to inform the UL MU frame transmission start time within the LL MU scheduling frame.
- the AP receiving the UL MU frame from the STAs may transmit an acknowledgment response frame (ACK frame) to the STAs after successful reception of the UL MU frame.
- ACK frame acknowledgment response frame
- FIG. 3 shows an example of a frame format available in a new standard to which the present invention is applied.
- L-Part represents a frame part (frame part for a first type terminal) for a legacy terminal
- HE-Part indicates an advanced standard technology (for example, IEEE 802.11ax).
- a frame portion for the terminal (frame portion for the second type terminal) is shown.
- the frame portion according to the new standard preferably has an integer length longer than the length of the frame portion for legacy terminals in the time domain.
- the legacy lx symbol structure ie, 3.2us
- the HE-preamble and data portion have a frame structure having a 4x symbol (ie, 12.8us) structure. It shows the use.
- the format shown in FIG. 3 is exemplary, and the symbol length of the HE-preamble portion may be defined differently.
- the HE-preamble may selectively use lx or 2x symbols, and the HE-LTF may specify to selectively use either 2x or 4x symbols.
- L-part may follow the configuration of L-STF, L-LTF, and L-SIG as it is maintained in the existing WiFi system.
- the HE-SIG of the newly defined HE-part may have fields for indicating common control information (Co ⁇ on control informat ion) and user specification information (user specific informat ion), respectively.
- FIG. 4 illustrates an example of a format of an UL MU scheduling frame according to an embodiment of the present invention.
- the UL MU scheduling frame includes a field indicating a BSSID or a TA, a plurality of STA identification information, and UL Tx of each STA as identification information for an AP to which a plurality of STAs are connected in an HE-SIG field. to be '' comprise a control information field.
- the BSSID is an identifier of a BSS including STAs, and ⁇ indicates an identifier (that is, an identifier of ⁇ in this example) of the STA that transmitted the frame.
- the BSSID / TA is information common to the MU Tx.
- the identifier and the control information for the STAs for the MU Tx preferably correspond to user specific information and include a plurality of information fields.
- the identifiers of the STAs may include one of an AID, a partial AID, and a MAC address of each STA.
- the control information for the UL MU Tx of STAs includes MU MIM0 information such as 0FDMA channel number (i.e., resource allocation information), number of streams, MCS, scheduling time (e.g., transmission start time, transmission duration). ) May be included.
- MU MIM0 information such as 0FDMA channel number (i.e., resource allocation information), number of streams, MCS, scheduling time (e.g., transmission start time, transmission duration). ) May be included.
- the scheduling time field of the corresponding control field may be sufficient to include only transmission duration information. Can be.
- the UL MU scheduling frame corresponds to the corresponding frame. It is proposed to further include an indicator indicating whether this frame is for UL MU scheduling.
- the HE-SIG may be configured to include an HE-SIG A for transmitting common control information and an HE-SIG B for transmitting user-specific control information.
- the MU indicator field and the BSSID / TA field may be included in the HE-SIG A and STA IDs and control information fields for the STAs in the HE-SIG B. . If the BSSID / TA field is not compressed, it may be transmitted as a part for carrying common information in the HE-SIG B.
- FIG. 5 is a diagram for explaining an example of configuring an UL MU scheduling frame by changing an existing CTS frame according to another embodiment of the present invention.
- the CTS frame is a male answer frame of the RTS frame and may include a frame control field, an interval field, an RA field, and an FCS field as shown in FIG. 5.
- the RA field may include ID (eg, PAID) field for a plurality of STAs and control information fields (eg, channel) for each STA. Number / MIM0 information, etc.).
- FIG. 5 illustrates a case in which UL Tx scheduling is performed on four STAs.
- the number of STAs need not be limited to this.
- the length of each information field is also exemplary.
- the STA receiving the UL MU scheduling frame illustrated in FIG. 4 and FIG. 5 has its ID in the corresponding UL MU scheduling frame
- the STA transmits the UL frame through the allocated OFDMA / MU MIM0 channel. Can be.
- FIG. 6 is a diagram for describing a method of performing UL UL scheduling to a plurality of STAs by an AP according to an embodiment of the present invention.
- an AP may first transmit DL MU frames to a plurality of STAs (STA 1... STA n).
- STAs receiving such a DL MU frame may transmit an UL frame including a BSR along with an acknowledgment acknowledgment signal (ACK) for the received DL MU frame after a predetermined time (for example, SIFS). That is, in this embodiment, STAs do not go through a separate competition process for transmitting BSR,
- the AP that has received the UL frame including the BSR may transmit the UL MU scheduling frame as described with reference to FIGS. 4 and 5 to the plurality of STAs based on the received BSR.
- the AP considers the BSR.
- the STA may transmit a UL MU frame at a given time and may receive an ACK from the AP.
- the NAV for the MU TX0P may be set according to section information of each frame. Note that when transmitting a DL MU frame, the NAV only needs to protect the DL MU frame until the DL MU frame is transmitted and the ACK frame is received. However, as in the present embodiment, the BAV is transmitted along with the ACK frame and the AP is considered. When transmitting the UL MU scheduling frame, it is preferable to extend the TX0P interval in consideration of the duration (Durat i on) until the UL MU scheduling frame transmission time.
- each frame in TX0P may have a specific time (eg,
- FIG. 7 illustrates a case in which an AP delays transmission of a UL MU scheduling frame to a plurality of STAs according to another embodiment of the present invention.
- the AP transmits a DL MU frame and receives the BSR together with the ACK from the STAs as in the case of FIG. 6.
- the present embodiment relates to a case in which an AP that has received a BSR cannot directly transmit a UL MU scheduling frame.
- the AP indicates a response frame (e.g. And a UL scheduling delay transmission indicator together with the ACK frame).
- the UL scheduling delay transmission indicator is an indicator indicating that the AP will transmit a UL MU scheduling frame later.
- the ACK (e.g., ACK) frame transmitted by the AP includes the transmission start time information when the AP transmits the UL MU scheduling frame in addition to the above-described delay indicator. It is preferable. As such, when the UL MU scheduling frame transmission start time information is not included, the UL MU scheduling frame may not be received after a predetermined time from STAs, and thus may be switched to operate as a SU. Problems can arise that can be more complicated.
- STAs that receive a frame in which the delay transmission indicator is set to 1 as described above may know in advance that a UL scheduling frame is received later.
- STAs may have an advantage of reducing power consumption by entering a doze state until a corresponding start time.
- FIG 8 and 9 illustrate a case in which a signal for requesting BSR transmission is included in a DL MU frame transmitted by an AP according to another embodiment of the present invention.
- the BSR request signal should indicate that the BSR should be included in a subsequent ACK frame, which may indicate that it should be included in one frame.
- one specific value of the ACK policy may indicate an ACK transmitted with the BSR.
- BSR request field value is set to 1
- the AP may transmit a BSR-REQ requesting the BSR to the STAs in the form of a UL MU scheduling frame, and allow the STAs to transmit the BSR.
- the AP may transmit a UL MU scheduling frame including scheduling information for UL MU frame transmission immediately after a predetermined time (eg, SIFS), and similarly to FIG. 9, a priority delay indicator.
- a first answer frame including the UL MU scheduling frame random transmission start time information, and then the UL MU scheduling frame may be transmitted at the corresponding time.
- STAs may transmit a UL MU frame at a time allocated to the STA and receive a male answer frame from the AP.
- FIG. 10 is a diagram for explaining a case of pi ggyback a UL MU scheduling frame to a DL MU frame transmitted by an AP according to another embodiment of the present invention.
- an AP transmits a DL MU frame in initial transmission, and STAs transmit the ACK frame including the BSR in the same manner as described above.
- the AP instead of separately transmitting the UL MU scheduling frame, the AP proposes to piggyback the UL MU scheduling frame in the DL MU frame.
- the ACKs transmitted by the STAs correspond to the UL MU scheduling frame. Can be piggybacked within a UL MU frame transmitted.
- a UL / DL frame received after SIFS after a DL / UL frame is transmitted may be set to be regarded as an ACK for the transmitted frame.
- the BSR transmitted by the STAs for the UL MU transmission may also be piggybacked and transmitted in the UL MU frame.
- FIG. 11 illustrates a case in which a UL MU scheduling frame is piggybacked from a DL MU frame initially transmitted by an AP according to another embodiment of the present invention.
- FIG. 11 may be set to include UL scheduling information from the DL MU frame transmitted first by the AP in the embodiment of FIG. 10. If the BSR information of the STAs is stored in the past, the UL scheduling information determined by using the STAs may be transmitted.
- FIG. 12 is a view for explaining another aspect of the present invention in UL MU Tx.
- STAs transmit a BSR for UL MU Tx, and accordingly, an AP may transmit a UL MU scheduling frame.
- STAs that receive the UL MU scheduling frame preferably transmit the UL MU data frame using a given resource after SIFS when their ID and the like are included in the UL MU scheduling frame.
- two of the STAs that have received the UL MU scheduling frame may not immediately transmit the UL MU data after SIFS due to a long processing delay.
- the problem as described above is solved. The operation configuration for the fault is described.
- FIG. 13 illustrates a scheme for including one or more meaningless subframes in an UL MU scheduling A-MPDU frame transmitted by an AP according to an embodiment of the present invention.
- FIG. 13 illustrates a structure in which a plurality of null subframes are included in a second half of a UL MU scheduling A-MPDU frame. How many null subframes the AP includes may be an implementation issue of the AP. As such, by adding a null subframe to the second half of the UL MU scheduling frame, STAs can prevent a problem in that the UL MU frame cannot be transmitted after the UL MU scheduling frame due to processor delay. That is, STAs receiving the UL MU scheduling frame may be configured to omit their decoding at positions of null subframes and to perform processing of received scheduling information at a corresponding time.
- null subframe In addition to the null subframe as described above, other subframes of the same purpose may be used.
- FIG. 14 illustrates UL MU scheduling by an AP according to another embodiment of the present invention.
- FIG. 4 illustrates a method of transmitting a P-delay frame after transmitting an A-MPDU frame.
- an AP transmitting a UL MU scheduling frame may transmit a P-delay frame after SIFS and receive a UL MU data frame from STAs after SIFS.
- the P-delay frame may include one or more It may include a meaningless A-MPDU subframe (eg, null subframe), and preferably, may include one null subframe.
- a meaningless A-MPDU subframe eg, null subframe
- the P-delay frame may have an NDP frame format.
- a specific field eg, a frame type field
- the SIG of the NDP indicates that the frame is a P-delay frame. Can be.
- the P-delay frame may include all or part of the L-part fields.
- the length of the L-SIG is preferably set to 0 as shown in FIG.
- STAs receiving the UL MU scheduling frame skip decoding the P-delayed A-MPDU frame based on the L-SIG field, and after receiving the P-delayed frame, the UL MU frame is removed after SIFS. Can be set to transmit.
- FIG. 19 illustrates a case of using a P-delay frame according to another embodiment of the present invention.
- the P-delay frame indicator field of the UL MU scheduling frame is set to 0. If determined, the AP does not transmit the P-delay frame, and STAs may be configured to transmit the UL MU data frame after SIFS after receiving the UL MU scheduling frame. 20 is a diagram for explaining an apparatus for implementing the method as described above.
- the wireless device 800 of FIG. 20 may be a specific STA of the above description, and the wireless device 850 may speak to the AP of the above-described description.
- the STA 800 may include a processor 810, a memory 820, and a transceiver 830, and the AP 850 may include the processor 860, the memory 870, and the transceiver 880. It may include.
- the transceivers 830 and 880 may transmit / receive radio signals and may be executed in a physical layer such as IEEE 802.11 / 3GPP.
- the processors 810 and 860 are executed at the physical layer and / or MAC layer, and are connected to the transceivers 830 and 880. Processors 810 and 860 may perform the UL MU scheduling procedure mentioned above.
- the memories 820 and 870 may include read-only memory (ROM), random access memory (RAM), flash memory, memory cards, storage media and / or other storage units. When an embodiment is executed by software, the method described above can be executed as a module (eg, process, function) that performs the functions described above.
- the modules may be stored in memory 820, 870 and executed by processor 81 860. All.
- the memories 820 and 870 may be disposed inside or outside the processes 810 and 860 and may be connected to the processes 810 and 860 by well-known means.
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AU2015272286A AU2015272286B2 (en) | 2014-06-08 | 2015-06-08 | Uplink multi-user transmission method in wireless LAN system and apparatus therefor |
CA2951524A CA2951524C (en) | 2014-06-08 | 2015-06-08 | Uplink multi-user transmission method in wireless lan system and apparatus therefor |
RU2016149312A RU2665050C2 (ru) | 2014-06-08 | 2015-06-08 | Способ многопользовательской передачи по восходящей линии связи в системе беспроводной lan и устройство для его осуществления |
KR1020227040363A KR20220158869A (ko) | 2014-06-08 | 2015-06-08 | 무선랜 시스템에서 상향링크 다중 사용자 전송 방법 및 이를 위한 장치 |
CN201580030624.0A CN106464476B (zh) | 2014-06-08 | 2015-06-08 | 无线lan系统中的上行链路多用户传输方法及其装置 |
KR1020167034400A KR102469965B1 (ko) | 2014-06-08 | 2015-06-08 | 무선랜 시스템에서 상향링크 다중 사용자 전송 방법 및 이를 위한 장치 |
JP2017514243A JP6507232B2 (ja) | 2014-06-08 | 2015-06-08 | 無線lanシステムにおいて上りリンク多重ユーザ送信方法及びそのための装置 |
US15/310,734 US10321472B2 (en) | 2014-06-08 | 2015-06-08 | Uplink multi-user transmission method in wireless LAN system and apparatus therefor |
EP15806676.1A EP3154213B1 (en) | 2014-06-08 | 2015-06-08 | Uplink multi-user transmission method in wireless lan system and apparatus therefor |
US16/395,963 US10548154B2 (en) | 2014-06-08 | 2019-04-26 | Uplink multi-user transmission method in wireless LAN system and apparatus therefor |
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AU2015272286B2 (en) | 2018-10-04 |
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KR20170017907A (ko) | 2017-02-15 |
AU2015272286A1 (en) | 2016-12-01 |
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JP2017522836A (ja) | 2017-08-10 |
RU2016149312A3 (ko) | 2018-07-10 |
CN106464476A (zh) | 2017-02-22 |
CN106464476B (zh) | 2019-06-28 |
CA2951524C (en) | 2020-04-14 |
US10548154B2 (en) | 2020-01-28 |
EP3154213A4 (en) | 2018-03-07 |
KR20220158869A (ko) | 2022-12-01 |
US10321472B2 (en) | 2019-06-11 |
CA2951524A1 (en) | 2015-12-17 |
KR102469965B1 (ko) | 2022-11-23 |
RU2665050C2 (ru) | 2018-08-28 |
US20170086212A1 (en) | 2017-03-23 |
EP3154213A1 (en) | 2017-04-12 |
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