WO2020080654A1 - Dispositif d'émission de données et dispositif de réception utilisant de multiples antennes dans un système av sans fil - Google Patents

Dispositif d'émission de données et dispositif de réception utilisant de multiples antennes dans un système av sans fil Download PDF

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Publication number
WO2020080654A1
WO2020080654A1 PCT/KR2019/009470 KR2019009470W WO2020080654A1 WO 2020080654 A1 WO2020080654 A1 WO 2020080654A1 KR 2019009470 W KR2019009470 W KR 2019009470W WO 2020080654 A1 WO2020080654 A1 WO 2020080654A1
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WIPO (PCT)
Prior art keywords
data
transmission
frame
wireless
header
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PCT/KR2019/009470
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English (en)
Korean (ko)
Inventor
김진민
배효원
안치준
최진수
Original Assignee
엘지전자 주식회사
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Publication of WO2020080654A1 publication Critical patent/WO2020080654A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/24—Cell structures
    • H04W16/28—Cell structures using beam steering
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA

Definitions

  • the present invention relates to a wireless audio / video (AV) system, and more particularly, to an apparatus and method for transmitting data using multiple antennas in a wireless AV system, and an apparatus and method for receiving data will be.
  • AV wireless audio / video
  • HD images high definition (HD) images and ultra high definition (UHD) images
  • UHD ultra high definition
  • IEEE 802.11ad is an ultra-fast wireless communication standard operating in a band of 60 GHz or higher.
  • the reach of the signal is about 10 meters, but the throughput can support over 6Gbps.
  • the IEEE 802.11ad standard provides a beamforming training process for antenna beam alignment.
  • IEEE 802.11ay is a next-generation standard that is being developed with a goal of over 20 Gbps throughput based on IEEE 802.11ad.
  • the data format or frame format used by the IEEE 802.11ad or ay-based medium access control layer (MAC layer) or physical layer includes a plurality of control information fields for controlling and managing resources and operations of multiple devices. do.
  • MAC layer medium access control layer
  • peer devices are premised on wireless communication in a specific situation (for example, communication between a wireless settop box and a wireless TV). .
  • the technical problem of the present invention is to provide an apparatus for transmitting and receiving data using multiple antennas in a wireless AV system.
  • Another technical problem of the present invention is to provide a method of transmitting information on a spatial transmission mode in a simplified manner in a wireless AV system.
  • Another technical problem of the present invention is to provide a method for indicating information on a spatial transmission mode using L-header information.
  • a data transmission device in a wireless audio / video (AV) system.
  • the apparatus performs a multiple input multiple output (MIMO) beamforming procedure during a data transmission interval (DTI) within a beacon interval (BI), and includes at least one header.
  • MIMO multiple input multiple output
  • BI beacon interval
  • PPDU physical layer protocol data unit
  • PSDU physical layer service data unit
  • It includes a communication unit for transmitting to the data receiving device through a wireless channel, and a processor connected to the communication unit, configured to generate AV data to be transmitted through the data frame and provide the communication unit.
  • the header may indicate at least information regarding a spatial transmission mode to be applied to transmission of a data frame.
  • the information on the spatial transmission mode is a combination of transmission mode selected from a plurality of transmission sectors supported by the data transmission apparatus and antenna mode related information indicating one of a single input single output (SISO) and MIMO. It may include an index (Tx sector combination index).
  • the information regarding the spatial transmission mode may be included in the most advanced header among the at least one header.
  • the preamble includes a non-EDMG portion and an EDMG portion sequentially from the left side where the preamble starts, and the non-EDMG (enhanced directional multi-gigabit) portion is a legacy short training field (L-STF).
  • L-STF legacy short training field
  • a legacy channel estimation field (L-CEF) and a legacy header (L-header), and information on the spatial transmission mode may be included in the L-header.
  • the header includes a turnaround field indicating whether to return, and a scrambler initialization field in which an interpretation method is determined by the return field, and information about the spatial transmission mode. May be indicated by the scrambler initialization field.
  • the return field is 1 bit, and if the value is 0, it indicates the first analysis method for the scrambler initialization field, and if the value is 1, it indicates the second analysis method for the scrambler initialization field. have.
  • the scrambler initialization field according to the first analysis method indicates whether a header A included in the EDMG part is present, and the scrambler initialization field according to the second analysis method relates to the spatial transmission mode. Information can be directed.
  • the scrambler initialization field according to the second analysis method may indicate the antenna mode-related information and the index of the transmission sector combination for each at least one requested channel bandwidth.
  • the number of streams and channel bonding used for the transmission of the data frame may be up to two.
  • the PPDU frame may be a request to send (RTS) frame for the data transmission device to reserve a radio link for transmission of the data frame.
  • RTS request to send
  • the communication unit may transmit the data frame based on the best transmission sector combination determined according to the MIMO beamforming procedure.
  • the communication unit without performing transmission of a request to send (RTS) frame and a clear to send (CTS) frame to reserve a radio link, the best determined according to the MIMO beamforming procedure (best ),
  • the PPDU frame or the data frame may be transmitted based on a combination of transmission sectors.
  • a data receiving apparatus in a wireless audio / video (AV) system.
  • the apparatus performs a multiple input multiple output (MIMO) beamforming procedure during a data transmission interval (DTI) within a beacon interval (BI), and includes at least one header.
  • Data transmission apparatus for a physical layer protocol data unit (PPDU) frame sequentially including a preamble and at least one physical layer service data unit (PSDU) through a wireless channel
  • PPDU physical layer protocol data unit
  • PSDU physical layer service data unit
  • a processor configured to acquire AV data from the data frame and is connected to the communication unit.
  • the header may indicate at least information regarding a spatial transmission mode to be applied to transmission of a data frame.
  • the information on the spatial transmission mode is a combination of transmission mode selected from a plurality of transmission sectors supported by the data transmission apparatus and antenna mode related information indicating one of a single input single output (SISO) and MIMO. It may include an index (Tx sector combination index).
  • the information regarding the spatial transmission mode may be included in the most advanced header among the at least one header.
  • the preamble includes a non-EDMG portion and an EDMG portion sequentially from the left side where the preamble starts, and the non-EDMG (enhanced directional multi-gigabit) portion is a legacy short training field (L-STF).
  • L-STF legacy short training field
  • a legacy channel estimation field (L-CEF) and a legacy header (L-header), and information on the spatial transmission mode may be included in the L-header.
  • the header includes a turnaround field indicating whether to return, and a scrambler initialization field in which an interpretation method is determined by the return field, and information about the spatial transmission mode. May be indicated by the scrambler initialization field.
  • the return field is 1 bit, and if the value is 0, it indicates the first analysis method for the scrambler initialization field, and if the value is 1, it indicates the second analysis method for the scrambler initialization field. have.
  • the scrambler initialization field according to the first analysis method indicates whether a header A included in the EDMG part is present, and the scrambler initialization field according to the second analysis method relates to the spatial transmission mode. Information can be directed.
  • the scrambler initialization field according to the second analysis method may indicate the antenna mode-related information and the index of the transmission sector combination for each at least one requested channel bandwidth.
  • the number of streams and channel bonding used for the transmission of the data frame may be up to two.
  • the PPDU frame may be a request to send (RTS) frame for the data transmission device to reserve a radio link for transmission of the data frame.
  • RTS request to send
  • the communication unit may receive the data frame based on the best transmission sector combination determined according to the MIMO beamforming procedure.
  • the communication unit without performing reception of a request to send (RTS) frame and a clear to send (CTS) frame to reserve a radio link, the best determined according to the MIMO beamforming procedure (best ),
  • the PPDU frame or the data frame may be received based on a combination of transmission sectors.
  • FIG. 1 is a block diagram of a wireless display system according to an embodiment.
  • FIG. 2 is a block diagram illustrating a wireless data transmission and reception system according to an embodiment.
  • FIG. 3 is a conceptual diagram when a wireless data transmission and reception system according to an embodiment is implemented with a communication protocol of the IEEE 802.11 series.
  • FIG. 4 is a view for explaining the configuration of the beacon interval according to an embodiment.
  • FIG. 5 is a diagram briefly showing a structure of a PHY protocol data unit (PPDU) frame according to an embodiment.
  • PPDU PHY protocol data unit
  • FIG. 6 shows a beamforming training process according to an embodiment.
  • FIG. 7 shows a beamforming training process according to another embodiment. This corresponds to the MIMO stage.
  • FIG. 8 illustrates a data communication method based on a beamforming training process according to an embodiment.
  • FIG. 9 illustrates a data communication method based on a beamforming training process according to another embodiment.
  • FIG. 10 shows a data communication method based on a beamforming training process according to another embodiment.
  • the present invention relates to a wireless AV system or a wireless display system in which a main body device and a display device are provided in a physical and / or electrically independent form, and play media based on wireless communication with each other.
  • FIG. 1 is a block diagram of a wireless AV system according to an embodiment.
  • the wireless AV system 10 may include a main body device 100, a display device 200, and a remote control device 300.
  • the main body device 100 receives an external signal in a wired / wireless form related to audio, video, picture, image, multimedia, or a combination thereof, and
  • the received external signal may be processed in various ways to generate a data stream or a bit stream to transmit to the display device 200 through a wireless interface.
  • the main body device 100 includes an external signal receiving unit 110, an external device interface unit 115, a storage unit 120, a main body control unit 130, a wireless communication unit 140, a power supply unit 150 ).
  • the external signal receiving unit 110 may include a tuner 111, a demodulation unit 112 and a network interface unit 113.
  • the tuner 111 receives an external signal in a wired / wireless form related to audio, video, video, image, multimedia, or at least one combination thereof. For example, the tuner 111 may select a specific broadcast channel according to a channel selection command and receive a broadcast signal for the selected specific broadcast channel.
  • the demodulator 112 may separate the received external signal into a video signal, an image signal, a video signal, an audio signal, a data signal related to a broadcast program, etc., and a separated video signal, image signal, video signal, audio signal, The data signal and the like related to the broadcast program can be restored to an outputable form.
  • the external device interface unit 115 may receive an application or a list of applications in an adjacent external device, and transmit it to the main body controller 130 or the storage unit 120.
  • the external device interface unit 115 may provide a connection path between the main body device 100 and the external device.
  • the external device interface unit 115 receives one or more of audio, video, video, image, multimedia, or a combination of at least one output from an external device connected wirelessly or wired to the main body device 100 to control the main body controller ( 130).
  • the external device interface unit 115 may include a plurality of external input terminals.
  • the plurality of external input terminals may include an RGB terminal, one or more High Definition Multimedia Interface (HDMI) terminals, and a component terminal.
  • HDMI High Definition Multimedia Interface
  • the external device connectable to the external device interface 115 may be any one of a set-top box, a Blu-ray player, a DVD player, a game machine, a sound bar, a smartphone, a PC, a USB memory, and a home theater, but this is only an example. .
  • the network interface unit 113 may provide an interface for connecting the main body device 100 to a wired / wireless network including an Internet network.
  • the network interface unit 113 may transmit or receive data with other users or other electronic devices through a connected network or another network linked to the connected network.
  • some content data stored in the main body device 100 may be transmitted to another user registered in advance in the main body device 100 or a selected user among other electronic devices or a selected electronic device.
  • the network interface unit 113 may access a predetermined web page through a connected network or another network linked to the connected network. That is, it is possible to connect to a predetermined web page through a network and transmit or receive data with the corresponding server.
  • the network interface unit 113 may receive content or data provided by a content provider or a network operator. That is, the network interface unit 113 may receive content such as a movie, advertisement, game, VOD, broadcast signal, and related information provided by a content provider or a network provider through a network.
  • the network interface unit 113 may receive update information and update files of firmware provided by the network operator, and may transmit data to the Internet or a content provider or a network operator.
  • the network interface unit 113 may select and receive a desired application from among applications that are open to the public through a network.
  • the storage unit 120 may store a program for processing and controlling each signal in the main body controller 130 and store a signal-processed image, audio, or data signal.
  • the storage unit 120 may perform a function for temporarily storing an image, audio, or data signal input from the external device interface unit 115 or the network interface unit 113, and is predetermined through a channel memory function. You can also store information about the image.
  • the storage unit 120 may store an application or application list input from the external device interface unit 115 or the network interface unit 113.
  • the main body control unit 130 may control the main body device 100 by a user command or an internal program input through the remote control device 300, and access the network to display a list of applications or applications desired by the user. ) You can make it downloadable within.
  • the main body controller 130 allows the channel information, etc. selected by the user to be output through the display apparatus 200 or the audio output unit 250 together with the processed image or audio signals.
  • the main body control unit 130 according to an external device image playback command received through the remote control device 300, from an external device, for example, a camera or camcorder, input through the external device interface unit 115,
  • the video signal or the audio signal can be output through the display device 200 or the audio output unit 250.
  • the main body control unit 130 may control the content stored in the storage unit 120, or received broadcast content, external input content input from the outside to be played, the content is broadcast video, external input video, Audio files, still images, connected web screens, and document files may be in various forms.
  • the main body controller 130 decodes video, image, video, audio, and broadcast program-related data input through the demodulator 112 or the external device interface 115 or the storage 120, and decodes the data. Is again encoded according to the sub / decoding method supported by the display apparatus 200, and is processed by various video / audio processing techniques such as compression and encoding to transmit the encoded data through a wireless channel to process the data stream or bitstream. Generating and transmitting the generated data stream or bit stream to the display device 200 through the wireless communication unit 140 may be performed.
  • the main body controller 130 wirelessly transmits the decoded data by bypassing the decoded data without encoding the decoded data again according to the sub / decoding method supported by the display apparatus 200 ( It may be transmitted directly to the display device 200 through 140).
  • main body controller 130 may be configured to implement functions, procedures, and / or methods of the processor 1130 of the wireless data transmission device 1100 described in each embodiment of the present specification. Layers of the radio interface protocol may be implemented in the processor 1130.
  • the wireless communication unit 140 is operatively coupled with the main body control unit 130 to receive a data stream or a bit stream from the main body control unit 130, and encode and / or encode the data stream or bit stream in a form for transmitting a wireless channel. By modulating, a wireless stream is generated and transmitted to the display device 200.
  • the wireless communication unit 140 forms a wireless link, and the main body device 100 and the display device 200 are connected by a wireless link.
  • the wireless communication unit 140 may be implemented based on various wireless communication methods such as short-range wireless communication such as WI-FI, Bluetooth, NFC, RFID, or a mobile communication network (eg, 3G, 4G, 5G cellular network, etc.).
  • the wireless communication unit 140 may communicate using a communication protocol such as the IEEE 802.11 standard.
  • the power supply unit 150 supplies power to the external signal receiving unit 110, the external device interface unit 115, the storage unit 120, the main body controller 130, and the wireless communication unit 140.
  • the method in which the power supply unit 150 receives power from the outside may include a terminal method and a wireless method.
  • the power supply unit 150 may include a separate configuration for wirelessly receiving power.
  • the power supply unit 150 is a power pick-up unit configured to receive wireless power through magnetic coupling with an external wireless power transmission device, and the wireless power supply unit to receive wireless power. It may include a separate communication and control unit (communication and control unit) configured to perform communication with the wireless power transmission device and to control the transmission and reception of wireless power.
  • the wireless communication unit 140 may also be wirelessly connected to the remote control device 300 to transmit a signal input by the user to the main body controller 130 or a signal from the main body controller 130 to the user.
  • the wireless communication unit 140 may be remotely controlled according to various communication methods such as Bluetooth, WB (Ultra Wideband), ZigBee, RF (Radio Frequency) communication, or infrared (IR) communication.
  • a control signal such as power on / off, screen setting, etc. of the main body device 100 may be received and processed from the device 300, or a control signal from the main body control unit 130 may be processed to be transmitted to the remote control device 300. have.
  • the wireless communication unit 140 may transmit a control signal input from a local key (not shown) such as a power key, a volume key, and a set value to the main body controller 130.
  • a local key such as a power key, a volume key, and a set value
  • the display apparatus 200 may perform an operation of processing a wireless stream received from the main body apparatus 100 through a wireless interface as a reverse process of signal processing by the main body apparatus 100 and then displaying or outputting audio.
  • the display device 200 includes a wireless communication unit 210, a user input interface unit 220, a panel control unit 230, a display unit 240, an audio output unit 250 and a power supply unit 260 ).
  • the wireless communication unit 210 is connected to the wireless communication unit 140 of the main body device 100 by a wireless link, and performs wireless communication with the wireless communication unit 140 of the main body device 100. Specifically, the wireless communication unit 210 receives a wireless stream from the wireless communication unit 140 of the main body device 100, demodulates it, and sends it to the panel control unit 230.
  • the wireless communication unit 210 may be implemented based on various wireless communication methods such as short-range wireless communication such as WI-FI, Bluetooth, NFC, RFID, or a mobile communication network (eg, 3G, 4G, 5G cellular network, etc.). For example, the wireless communication unit 210 may communicate using a communication protocol such as the IEEE 802.11 standard.
  • the panel control unit 230 decodes the signal demodulated by the wireless communication unit 210 to restore a bit stream or a data stream. At this time, when the bit stream or the data stream is compressed, the panel controller 230 performs an operation of decompressing or restoring the bit stream or data stream, and then performs a video signal, an image signal, a video signal, an audio signal, and a broadcast program. It can be output as a data signal related to the display unit 240, the audio output unit 250 and the user input interface unit 220, respectively.
  • the video signal, the video signal, the image signal, etc. may be input to the display unit 240 and displayed as an image corresponding to the corresponding video signal.
  • the image signal processed by the panel control unit 230 is transmitted to the main body device 100 through the wireless communication unit 210 again, and input to the external output device through the external device interface unit 115 of the main body device 100. Can be.
  • the audio signal processed by the panel control unit 230 may be audio output to the audio output unit 250.
  • the voice signal processed by the panel control unit 230 is transmitted to the main body device 100 through the wireless communication unit 210 again, and input to the external output device through the external device interface unit 115 of the main body device 100. Can be.
  • the panel control unit 230 may control the display unit 240 to display an image, for example, a broadcast image input through the tuner 111 or an external input through the external device interface unit 115.
  • the input image, or an image input through the network interface unit, or an image stored in the storage unit 120 may be controlled to be displayed on the display unit 240.
  • the image displayed on the display unit 240 may be a still image or a video, and may be a 2D image or a 3D image.
  • the panel controller 230 may be configured to implement functions, procedures, and / or methods of the processor 1230 of the wireless data receiving device 1200 described in each embodiment of the present specification.
  • the processor 1230 may be configured to implement functions, procedures, and / or methods of the wireless data receiving device 1200 described in each embodiment of the present specification.
  • the user input interface unit 220 may transmit a signal input by the user to the panel control unit 230 or a signal from the panel control unit 230 to the user.
  • the user input interface unit 220 may be in accordance with various communication methods such as Bluetooth, WB (Ultra Wideband), ZigBee, RF (Radio Frequency) communication, or infrared (IR) communication, Control signals such as power on / off, screen setting, etc. of the display device 200 are received from the remote control device 300 or processed to transmit control signals from the panel control unit 230 to the remote control device 300. can do.
  • the user input interface unit 220 may transmit a control signal input from a local key (not shown), such as a power key, a volume key, and a set value, to the panel controller 230.
  • a local key such as a power key, a volume key, and a set value
  • the power supply unit 260 supplies power to the wireless communication unit 210, the user input interface unit 220, the panel control unit 230, the display unit 240, and the audio output unit 250.
  • the method in which the power supply unit 260 receives power from the outside may include a terminal method and a wireless method.
  • the power supply unit 260 may include a separate configuration for wirelessly receiving power.
  • the power supply unit 260 is a power pick-up unit configured to receive wireless power through magnetic coupling with an external wireless power transmission device, and the wireless power transmission unit to receive wireless power. It may include a separate communication and control unit (communication and control unit) configured to perform communication with the wireless power transmission device and to control the transmission and reception of wireless power.
  • the remote control device 300 performs an operation of remotely controlling the power on / off, channel selection, screen setting, etc. of the main body device 100 and / or the display device 200 and may also be called a remote control.
  • main body device 100 and the display device 200 shown in FIG. 1 are only one embodiment of the present invention. Some of the illustrated components may be integrated, added, or omitted according to specifications of the main body device 100 and the display device 200 that are actually implemented. That is, two or more components may be combined into one component, or one component may be divided into two or more components as necessary.
  • the function performed in each block is for explaining an embodiment of the present invention, the specific operation or device does not limit the scope of the present invention.
  • the main body device 100 unlike the one shown in Figure 1, without a tuner 111 and the demodulator 112, the network interface unit 113 or the external device interface unit ( 115) to receive and play the video.
  • the main body device 100 is divided into an image processing device such as a set-top box for receiving broadcast signals or contents according to various network services, and a content playback device for playing content input from the image processing device. Can be implemented.
  • an image processing device such as a set-top box for receiving broadcast signals or contents according to various network services
  • a content playback device for playing content input from the image processing device. Can be implemented.
  • the operation method of the wireless AV system 10 will be described below, as well as the main body device 100 and the display device 200 as described with reference to FIG. 1, as well as the separated set top. It may be performed by any one of an image processing apparatus such as a box or a content reproduction apparatus having an audio output unit 250.
  • the main body apparatus 100 may be referred to as a wireless source device that provides a source wirelessly, and the display apparatus 200 is a wireless sink device that receives a source wirelessly.
  • Wireless source devices and wireless sink devices are wireless displays that are compatible with standards such as Wireless HD, Wireless Home Digital Interface (WHDI), WiGig, Wireless USB, and Wi-Fi Display (WFD) (also known as Miracast) ( WD) communication technologies.
  • WFD Wireless Home Digital Interface
  • WFD Wi-Fi Display
  • the main body device 100 may be integrated in a form of forming part of a wireless set-top box, a wireless gaming console, a wireless digital video disc (DVD) player, and a wireless writer.
  • the main body device 100 may be provided in the form of a wireless communication module or a chip.
  • the display device 200 is a user device or an electronic device having a display panel for displaying images and videos (eg, wireless TV, wireless monitor, wireless projector, wireless printer, wireless vehicle dashboard display, wearable device, augmented reality) (AR) headset or virtual reality (VR) headset, etc.).
  • the display device 200 may be provided in the form of a wireless communication module or chip.
  • the main body apparatus 100 and the display apparatus 200 may be integrated into a form constituting a part of the mobile device.
  • the main body apparatus 100 and the display apparatus 200 may include a mobile terminal including a smart phone, a smart pad or tablets, or other types of wireless communication devices, portable computers with wireless communication cards, personal portable information. It can be incorporated into a terminal (PDA), a portable media player, a digital image capturing device such as a camera or camcorder, or other flash memory device with wireless communication capabilities.
  • the main body device 100 and the display device 200 may be provided in the form of a wireless communication module or chip.
  • Smartphone users can stream video and audio output by their smartphones, tablets, or other computing devices to other devices, such as televisions or projectors, that may provide a higher resolution display or other enhanced user experience. You can mirror it.
  • the main body device 100 receives an external signal in a wired / wireless form related to audio, video, video, image, multimedia, or at least one combination thereof, and processes the received external signal in various ways.
  • An operation of generating a data stream or a bitstream and transmitting it to the display device 200 through a wireless interface may be performed.
  • wireless data video / video / audio data transmitted through a wireless interface
  • the main body device 100 may wirelessly communicate with the display device 200 and transmit wireless data. Therefore, from the perspective of the wireless data transmission and reception system 1000, the main body device 100 may be referred to as a wireless data transmission device 1100, and the display device 200 may be referred to as a wireless data reception device 1200.
  • the present invention will be described in more detail in terms of the wireless data transmission and reception system 1000. First, a detailed block diagram of the wireless data transmission and reception system 1000 will be described.
  • FIG. 2 is a block diagram illustrating a wireless data transmission and reception system according to an embodiment.
  • a wireless data stream transceiving system 1000 refers to a system for wirelessly transmitting and receiving a data stream, and includes a wireless data transmission device 1100 and at least one wireless data reception device ( 1200).
  • the wireless data transmission device 1100 is communicatively coupled to at least one wireless data reception device 1200.
  • the data may include audio, video, picture, image, multimedia, or a combination of at least one of them.
  • the data includes a bit stream of compressed audio, a bit stream of compressed video, a bit stream of compressed video, and a bit stream of compressed multimedia. It may also include at least one combination.
  • the wireless data transmission / reception system 1000 may be referred to as a wireless compressed data stream transmission / reception system.
  • the wireless compressed data stream transmission / reception system 1000 may further include a functional or physical unit for compressing data.
  • the wireless data transmission device 1100 includes a processor 1130, a memory 1120 and a communication unit 1140, and the wireless data receiving device 1200 includes a communication unit 1210 and a memory 1220. ) And a processor 1230.
  • the processor 1130 may be configured to implement functions, procedures, and / or methods of the wireless data transmission device 1100 described in each embodiment of the present specification.
  • the processor 1230 may be configured to implement functions, procedures, and / or methods of the wireless data receiving device 1200 described in each embodiment of the present specification.
  • the layers of the radio interface protocol may be implemented in the processors 1130 and 1230.
  • the processor 1130 may be configured to perform the functions of the main body controller 130. For example, the processor 1130 decodes video, image, video, audio, data related to a broadcast program, etc. input through the demodulator 112 or the external device interface 115 or the storage 120, In order to transmit the decoded data back to the wireless channel, a data stream or a bit stream is generated by processing with various video / audio processing techniques such as compression and encoding, and the generated data stream or bit stream is displayed through the communication unit 1140. The operation of transmitting to 200 may be performed.
  • the memories 1120 and 1220 are operatively coupled with the processors 1130 and 1230 and store various information for operating the processors 1130 and 1230.
  • the communication units 1140 and 1210 are operatively coupled with the processors 1130 and 1230, and transmit and / or receive data wirelessly.
  • the communication units 1140 and 1210 form a radio link 11, and the radio data transmission device 1100 and the radio data reception device 1200 are connected by a radio link 11.
  • the communication units 1140 and 1210 may be implemented based on various wireless communication methods such as short-range wireless communication such as WI-FI, Bluetooth, NFC, RFID, or a mobile communication network (eg, 3G, 4G, 5G cellular network, etc.). .
  • the communication units 1140 and 1210 may communicate using a communication protocol such as the IEEE 802.11 standard.
  • FIG. 3 is a conceptual diagram when a wireless data transmission and reception system according to an embodiment is implemented with a communication protocol of the IEEE 802.11 series.
  • the wireless data transmission and reception system 20 of FIG. 3 (A) may include at least one basic service set (hereinafter referred to as 'BSS', 21, 25).
  • BSS is a set of access points (hereinafter referred to as 'AP') and stations (hereinafter referred to as 'STA') that can successfully communicate with each other through synchronization, and does not indicate a specific area.
  • the first BSS 21 may include a first AP 22 and one first STA 21-1.
  • the second BSS 25 may include a second AP 26 and one or more STAs 25-1 and 25-2.
  • the first AP 22 may correspond to the communication unit 1140 of FIG. 2
  • the one or more STAs 25-1 and 25-2 may correspond to the communication unit 1210 of FIG. 2.
  • the infrastructure BSSs 21 and 25 may include at least one STA, APs 22 and 26 providing distributed services, and a distributed system 27 connecting multiple APs.
  • the distributed system 27 may connect a plurality of BSSs 22 and 26 to implement an extended service set (hereinafter, 'ESS'), which is an extended service set.
  • 'ESS' extended service set
  • the ESS 28 may be used as a term indicating one network in which at least one AP 22, 26 is connected through the distributed system 27. At least one AP included in one ESS 28 may have the same service set identification (hereinafter 'SSID').
  • the portal 29 may serve as a bridge that performs a connection between a WLAN network (IEEE 802.11) and another network (eg, 802.X).
  • IEEE 802.11 IEEE 802.11
  • another network eg, 802.X
  • the network between the APs 22 and 26 and the network between the APs 22 and 26 and the STAs 21-1, 25-1 and 25-2 in the wireless LAN having the structure as shown in FIG. 3A may be implemented. You can.
  • the wireless data transmission / reception system 30 of FIG. 3B may be able to perform communication by establishing a network between STAs without the APs 22 and 26, unlike the FIG. 3A.
  • a network that establishes a network even between STAs without APs 22 and 26 to perform communication is defined as an ad-hoc network or an independent basic service set (IBSS).
  • IBSS independent basic service set
  • the wireless data transmission / reception system 30 is a BSS operating in an ad-hoc mode, that is, IBSS. Since IBSS does not include an AP, there is no centralized management entity performing central management functions. Accordingly, in the wireless data transmission / reception system 30, STAs 31-1, 31-2, 31-3, 32-4, and 32-5 are managed in a distributed manner.
  • the STAs 31-1, 31-2, 31-3, 32-4, and 32-5 may correspond to the communication unit 1140 or the communication unit 1210 of FIG. 2.
  • All STAs 31-1, 31-2, 31-3, 32-4, and 32-5 of the IBSS may consist of mobile STAs, and access to a distributed system is not allowed. All STAs of IBSS form a self-contained network.
  • the STA referred to in this specification includes a medium access control (hereinafter referred to as 'MAC') and a physical layer interface to a wireless medium in accordance with the Institute of Electrical and Electronics Engineers (IEEE) 802.11 standard.
  • 'MAC' medium access control
  • IEEE 802.11 Institute of Electrical and Electronics Engineers 802.11 standard
  • STAs referred to herein are mobile terminals, wireless devices, wireless transmit / receive units (WTRUs), user equipment (UEs), and mobile stations (MSs). , It may also be called various names such as a mobile subscriber unit or simply a user.
  • the communication channel formed by the communication units 1140 and 1210 may be a network communication channel.
  • the communication units 1140 and 1210 may establish a tunneled direct link setup (TDLS) to avoid or reduce network congestion.
  • TDLS tunneled direct link setup
  • Wi-Fi Direct and TDLS are for setting up relatively short-range communication sessions.
  • the communication channel forming the radio link 11 may be a relatively short range communication channel, and Wi-Fi using various frequencies such as 2.4 GHz, 3.6 GHz, 5 GHz, 60 GHz, or ultra-wide band (UWB), It may be a communication channel implemented using a physical channel structure such as Bluetooth.
  • wireless communication between communication units 1140 and 1210 may use orthogonal frequency division multiplexing (OFDM) techniques.
  • OFDM orthogonal frequency division multiplexing
  • Various other wireless communication techniques including, but not limited to, time division multiple access (TDMA), frequency division multiple access (FDMA), code division multiple access (CDMA), or any combination of OFDM, FDMA, TDMA and / or CDMA. It can also be used.
  • the processors 1130 and 1230 may include application-specific integrated circuits (ASICs), other chipsets, logic circuits, and / or data processing devices.
  • the memories 1120 and 1220 may include read-only memory (ROM), random access memory (RAM), flash memory, memory cards, storage media, and / or other storage devices.
  • the communication units 1140 and 1210 may include a baseband circuit for processing radio frequency signals.
  • the techniques described herein may be implemented as a module (eg, procedure, function, etc.) that performs the functions described herein. Modules may be stored in memory 1120, 1220 and executed by processors 1130, 1230.
  • the memories 1120 and 1220 may be implemented inside the processors 1130 and 1230. Alternatively, the memories 1120 and 1220 may be implemented outside the processors 1130 and 1230, and may be communicatively connected to the processors 1130 and 1230 through various means known in the art.
  • the wireless data transmission device 1100 may be called an AP or a personal basic service set control point (PCP) station
  • the wireless data reception device 1200 may be a STA or non It can be called a non-personal basic service set control point (PCP) station.
  • PCP personal basic service set control point
  • the wireless data transmission device 1100 may be referred to as a wireless source device that provides a source wirelessly, and the wireless data receiving device 1200 wirelessly receives a source wirelessly. It can be called a sink device (wireless sink device).
  • Wireless source devices and wireless sink devices are wireless displays that are compatible with standards such as Wireless HD, Wireless Home Digital Interface (WHDI), WiGig, Wireless USB, and Wi-Fi Display (WFD) (also known as Miracast) ( WD) communication technologies.
  • the wireless data transmission device 1100 may be integrated in a form of a part of a wireless set-top box, a wireless gaming console, a wireless digital video disc (DVD) player, and a wireless writer.
  • the wireless data transmission device 1100 may be provided in the form of a wireless communication module or chip.
  • the wireless data receiving device 1200 may be a user device or an electronic device having a display panel for displaying images and videos (eg, a wireless TV, a wireless monitor, a wireless projector, a wireless printer, a wireless vehicle dashboard display, a wearable device, Augmented reality (AR) headset or virtual reality (VR) headset, etc.).
  • the wireless data receiving device 1200 may be provided in the form of a wireless communication module or chip.
  • the wireless data transmission device 1100 and the wireless data reception device 1200 may be integrated into a form constituting a part of the mobile device.
  • the wireless data transmission device 1100 and the wireless data reception device 1200 are mobile terminals including smart phones, smart pads or tablets, or other types of wireless communication devices, portable computers with wireless communication cards.
  • a digital image capturing device such as a personal digital assistant (PDA), portable media player, camera or camcorder, or other flash memory device with wireless communication capabilities.
  • the wireless data transmission device 1100 and the wireless data reception device 1200 may be provided in the form of a wireless communication module or chip.
  • Smartphone users can stream video and audio output by their smartphones, tablets, or other computing devices to other devices, such as televisions or projectors, that may provide a higher resolution display or other enhanced user experience. You can mirror it.
  • FIG. 4 is a view for explaining the configuration of the beacon interval according to an embodiment.
  • time of a medium may be divided into beacon intervals.
  • the lower periods within the beacon interval may be referred to as an access period.
  • Different access intervals within one beacon interval may have different access rules.
  • Information on the access section may be transmitted to a non-AP STA or a non-PCP by an AP or a personal basic service set control point (PCP).
  • PCP personal basic service set control point
  • One beacon interval may include one BHI (Beacon Header Interval) and one DTI (Data Transfer Interval).
  • the BHI may include a Beacon Transmission Interval (BTI), an Association Beamforming Training (A-BFT), and an Announcement Transmission Interval (ATI).
  • BTI Beacon Transmission Interval
  • A-BFT Association Beamforming Training
  • ATI Announcement Transmission Interval
  • BTI means an interval in which one or more EDMG beacon frames can be transmitted.
  • A-BFT means a section in which beamforming training is performed by the STA that has transmitted the EDMG beacon frame during the preceding BTI.
  • ATI refers to a request-response-based management access section between PCP / AP and non-PCP / non-AP STA.
  • DTI Data Transfer Interval
  • CBAP Contention Based Access Period
  • SP Service Period
  • FIG. 5 is a diagram briefly showing a structure of a PHY protocol data unit (PPDU) frame according to an embodiment.
  • PPDU PHY protocol data unit
  • the PPDU frame includes a legacy-short training field (L-STF), a legacy-channel estimation field (L-CEF), a legacy-header, and an enhanced directional multi-gigabit (EDMG-header A).
  • L-STF contains training signals.
  • the L-header includes control information for the first legacy station (eg, a station supporting IEEE802.11ad), and the EDMG-header is for a second legacy station (eg, a station supporting IEEE802.11ay).
  • the control information includes EDMG-STF and may include training signals for the second legacy station.
  • a portion including the L-STF, L-CEF, and L-header fields may be referred to as a non-EDMG portion, and the remaining portion may be referred to as an EDMG region.
  • L-STF, L-CEF, L-Header, and EDMG-Header-A fields may be referred to as pre-EDMG modulated fields and the rest may be referred to as EDMG modulated fields.
  • FIG. 6 shows a beamforming training process according to an embodiment.
  • Beamforming (BF) training is to provide signaling necessary for each STA to determine transmission of a BF training frame using a sector sweep (sector sweep) and proper antenna system settings.
  • the BF training process includes a Sector Level Sweep (SLS) process for selecting a coarse beam and a Beam Refinement Protocol (BRP) process for selecting a detailed beam.
  • SLS Sector Level Sweep
  • BRP Beam Refinement Protocol
  • an approximate transmission direction is determined using a relatively wide beam.
  • relatively few antenna elements can be used.
  • the transmitting end may operate in a beamforming mode (directional antenna mode), and the receiving end may operate in a quasi-omni antenna mode.
  • the receiving end may estimate a transmission beam of the transmitting end by receiving a specific signal (eg, preamble) transmitted by the transmitting end while sweeping the beam.
  • the transmission / reception beam combination is precisely determined using a relatively narrow beam.
  • the BRP process may include SISO phase and MIMO phase.
  • the BRP process uses more antenna elements than the SLS process, and can increase precision through repetition.
  • the SISO step can be performed as a pre-determination procedure to reduce the burden of the MIMO step, so the SISO step can be selectively included within the BRP process. If the SISO step is omitted, the BRP process may be identified with the MIMO step, and in this case, the BRP process may be referred to as a MIMO step.
  • a state in which minimal communication is possible such as transmission of a control packet and a beacon, is established, and an optimal beam between a transmitting end and a receiving end is determined.
  • an STA wishing to transmit data through a beamforming operation is called an initiator, and an STA receiving data from the initiator is called a responder.
  • BF training that occurs within an A-BFT (Association BeamForming Training) assignment, the AP or PCP / AP is the initiator, and the non-AP and non-PCP / AP STAs are responders.
  • the source (EDMG) STA of the SP is an initiator, and the destination STA of the SP becomes a responder.
  • TXOP Transmission Opportunity
  • the link from the initiator to the responder is called an initiator link, and the link from the responder to the initiator is called a responder link.
  • a directional transmission method may be applied instead of an omni transmission method in order to more reliably transmit data, control information, and the like.
  • STAs that want to transmit / receive data may know TX or RX best sectors for the initiator and the responder through the SLS process.
  • This BF training starts with a Sector Level Sweep (SLS) from the initiator.
  • SLS Sector Level Sweep
  • the purpose of the SLS process is to enable communication between two STAs in the control PHY rate or higher MCS.
  • the SLS process only provides for transmitting BF training.
  • SLS is a protocol for performing link detection in a wireless AV system to which the present invention is applicable, and continuously transmits / receives a frame including performance information of a receiving channel link while network nodes change only a beam direction, Among the successfully received frames, an index indicating an optimal frame (eg, Signal to Ratio (SNR), Received Signal Strength Indicator (RSSI), etc.) may be a beam training method for selecting the best beam direction.
  • SNR Signal to Ratio
  • RSSI Received Signal Strength Indicator
  • the SLS may be followed by a BRP (Beam Refinement Protocol or Beam Refinement Phase).
  • BRP Beam Refinement Protocol or Beam Refinement Phase
  • the purpose of the BRP phase is to enable reception training and iterative refinement of the Antenna Weight Vector (AWV) of all transmitters and receivers in all STAs. If one of the STAs participating in the beam training selects to use only one transmit antenna pattern, reception training may be performed as part of the SLS process.
  • AMV Antenna Weight Vector
  • the SLS process may include an Initiator Sector Sweep (ISS) for training an initiator link, a Responder Sector Sweep (RSS) for training a responder link, SSW feedback, and an SSW ACK.
  • ISS Initiator Sector Sweep
  • RSS Responder Sector Sweep
  • SSW feedback SSW feedback
  • SSW ACK SSW ACK
  • the initiator may start the SLS process by transmitting the frame (s) of the ISS. Respondents do not start sending the frame (s) of RSS before the ISS completes successfully. However, it may be an exception when the ISS occurs within the BTI. The initiator may not initiate SSW feedback before the RSS phase is successfully completed. However, it may be an exception when the RSS occurs within the A-BFT. The responder does not initiate the SSW ACK of the initiator within the A-BFT. The responder can start the SSW ACK of the initiator immediately after successful completion of the SSW feedback of the initiator.
  • the BF frame transmitted by the initiator during the SLS process may include (EDMG) beacon frame, SSW frame, and SSW feedback frame.
  • the BF frame transmitted by the responder may include an SSW frame and an SSW-ACK frame.
  • TXSS Transmit Sector Sweep
  • the initiator and responder at the end of the SLS process retain their own transmission sector. If the ISS or RSS employs a receive sector sweep, each responder or initiator has its own receive sector. The STA does not change the transmit power during sector sweep.
  • an initiator and a responder may use a Short SSW frame, and for this, definition of an SSW feedback frame and an SSW ACK frame may be required.
  • FIG. 7 shows a beamforming training process according to another embodiment. This corresponds to the MIMO stage.
  • the MIMO stage may be composed of four subphases again.
  • This MIMO step may be an operation performed at the physical layer of the initiator and the responder.
  • the MIMO step includes a BF setup step, an initiator BF training step, a responder BF training step, and a BF feedback step.
  • the initiator may be a device for transmitting AV data
  • the responder may be a device for receiving AV data.
  • control or management data transmitted by a receiving device of AV data may exist in a wireless AV system.
  • the apparatus for receiving AV data may be an initiator
  • the apparatus for transmitting AV data may be a responder.
  • a device or a peer device for transmitting data is called an initiator
  • a device or a peer device for receiving data is called a responder.
  • the initiator may send a MIMO BF setup frame to the responder.
  • the MIMO BF setup frame may include a single user / multi user (SU / MU) field set to 1.
  • Respondents who have received the MIMO BF setup frame from the initiator transmit the MIMO BF setup frame back to the initiator. This completes the BF setup phase.
  • the initiator performs transmission MIMO beamforming through at least one BRP.
  • the responder performs reception MIMO beamforming through at least one BRP.
  • the initiator and the responder respectively transmit a feedback frame for the result of the MIMO beamforming performed by the counterpart to the counterpart. That is, the initiator sends a feedback frame for R-SMBT to the responder, and the responder sends a feedback frame for I-SMBT to the initiator.
  • the operation of the MAC layer and the physical layer of the initiator is a communication unit of the wireless data transmission device 1100 Performed by 1140, the operation of the MAC layer and the physical layer of the responder may be performed by the communication unit 1210 of the wireless data receiving device 1200.
  • the embodiment of FIG. 7 when the initiator is the wireless data transmission device 1100 and the responder is the wireless data reception device 1200, the operation of the MAC layer and the physical layer of the initiator is a communication unit of the wireless data transmission device 1100 Performed by 1140, the operation of the MAC layer and the physical layer of the responder may be performed by the communication unit 1210 of the wireless data receiving device 1200.
  • the operation of the MAC layer and the physical layer of the initiator is the wireless data receiver 1200 It is performed by the communication unit 1210, the operation of the MAC layer and the physical layer of the responder may be performed by the communication unit 1140 of the wireless data transmission device 1100.
  • FIG. 8 illustrates a data communication method based on a beamforming training process according to an embodiment.
  • an initiator and a responder complete a beamforming training process during a data transmission interval (DTI) within a beacon interval (BI) (S800)
  • the initiator and the responder Each may store the results of the beamforming training and enter the MIMO channel access step. It can be assumed that a certain time has elapsed between steps S800 and S805.
  • the beamforming training result may be expressed as performance for each spatial transmission mode in the current communication environment.
  • the spatial transmission mode may include an antenna mode such as a single antenna mode (SISO) or multiple antenna mode (MIMO).
  • the initiator and the responder may estimate or determine the performance of the single antenna mode and the performance of the multiple antenna mode in the current communication environment based on the beamforming training, and store it.
  • the initiator and the responder may determine whether a single antenna mode or a multiple antenna mode is suitable for transmission of a data frame in a current communication environment based on beamforming training.
  • the spatial transmission mode may include a combination of transmission sectors.
  • the initiator and the responder can estimate or determine the performance of each combination of transmission sectors in the current communication environment based on the beamforming training, and store it.
  • the initiator and the responder may determine which transmission sector combination is suitable for data frame transmission in the current communication environment based on beamforming training.
  • the spatial transmission mode may include a combination of an antenna mode and a transmission sector.
  • the initiator and the responder can estimate or determine the performance of the antenna mode and the performance of each transmission sector combination in the current communication environment based on the beamforming training, and store it.
  • the initiator and the responder can determine which antenna mode and which transmission sector combination is suitable for transmission of a data frame in the current communication environment based on beamforming training.
  • the initiator Before the data frame is transmitted, the initiator needs to determine which spatial transmission mode to send the data frame to, and first inform the respondent what spatial transmission mode is to be applied to the transmission of the data frame.
  • the initiator may transmit information about the data frame using SISO or MIMO (that is, information regarding antenna mode). First, it is sent to the respondent.
  • SISO or MIMO that is, information regarding antenna mode
  • the initiator transmits a data frame using MIMO to the responder, information about which transmission sector combination index is transmitted among the plurality of transmission sector combinations that the initiator can support (that is, information about the transmission sector combination index). Send it first.
  • the information on the antenna mode and the information on the transmission sector combination index are described and transmitted, but these information can be simultaneously transmitted and indicated by one field, and transmitted on the same PPDU frame. have.
  • the information on the antenna mode and the information on the transmission sector combination index are collectively referred to as information on the spatial transmission mode.
  • the spatial transmission mode may further include information on channel bonding.
  • the spatial transmission mode may be referred to as MIMO setting, and information regarding the spatial transmission mode may be referred to as MIMO setting information.
  • Information on the spatial transmission mode may be carried in a PPDU frame, and according to the present embodiment, information on the spatial transmission mode may be transmitted through an RTS frame.
  • the initiator may generate a request to send (RTS) frame including information on the first spatial transmission mode and transmit it to the responder (S805).
  • RTS request to send
  • the RTS frame allows the initiator to acquire a transmission opportunity (TXOP), whereby a radio link for transmission of the data frame can be reserved.
  • the RTS frame includes a preamble including at least one header, at least one physical layer service data unit (PSDU), and a physical layer protocol data unit sequentially including a TRN (training) field.
  • PSDU physical layer service data unit
  • PPDU physical layer protocol data unit sequentially including a TRN (training) field.
  • a preamble of a PPDU frame may include information regarding a first spatial transmission mode to be applied to transmission of the data frame.
  • At least one header included in a preamble of a PPDU frame may indicate information regarding a first spatial transmission mode to be applied to transmission of the data frame.
  • the preamble includes L-STF, L-CEF, L-header and EDMG header-A sequentially from the left side where the preamble starts. That is, at least one header included in the preamble may include a header field (L-header) for a legacy station and a header field (EDMG-header A) for an evolved station.
  • L-header header field
  • EDMG-header A header field
  • information regarding the first spatial transmission mode may be included in the most advanced header, that is, the L-header, among the at least one header.
  • the information on the first spatial transmission mode may be included in the EDMG-header A.
  • the responder since the responder may also have a data frame or a (block) ACK frame to be transmitted to the initiator, the responder can also transmit information regarding the second spatial transmission mode to be applied to the data frame to be transmitted to the initiator.
  • Information regarding the second spatial transmission mode may be transmitted on a CTS frame, for example (S810).
  • the initiator transmits the data frame to the responder based on the first spatial transmission mode (S815).
  • the responder can select the reception mode optimized for the antenna mode (SISO or MIMO) selected by the initiator (or determined) and the transmission sector combination index, and receive the data frame. have.
  • the responder may transmit his data frame or ACK frame to the initiator (S820).
  • the ACK frame may be a block ACK frame.
  • the data frame or the ACK frame according to step S820 may be transmitted based on the second spatial transmission mode.
  • information regarding a spatial transmission mode is described as being included in an RTS frame or a CTS frame, but this is only an example and may be included and transmitted in a PPDU frame or an A-PPDU frame for other types or purposes.
  • the decoding branch procedure is compared to the case where it is carried in another part of the PPDU frame (for example, PSDU termination, control trailer (CT)).
  • additional coding / decoding modules are unnecessary, so the complexity of implementation can be reduced.
  • the overall PPDU frame is reduced in length and the overhead is reduced.
  • the operation of the initiator is performed by the communication unit 1140 of the wireless data transmission device 1100
  • the operation of the responder may be performed by the communication unit 1210 of the wireless data receiving device 1200.
  • the operation of the initiator is performed by the communication unit 1210 of the wireless data receiving device 1200.
  • the operation of the respondent may be performed by the communication unit 1140 of the wireless data transmission device 1100.
  • the information on the spatial transmission mode is included in the L-header, the information on the spatial transmission mode will be described in more detail.
  • information on the spatial transmission mode may be indicated by a combination of at least two fields included in the L-header.
  • the two fields may include, for example, a turnaround field and a scrambler initialization field. That is, the combination of the return field and the scrambler initialization field may indicate information regarding the spatial transmission mode.
  • the return field is 1 bit, and a method of interpreting the scrambler initialization field can be determined. For example, if the value of the return field is 0, the first analysis method for the scrambler initialization field may be indicated, and if the value of the return field is 1, the second analysis method for the scrambler initialization field may be indicated.
  • the scrambler initialization field according to the first analysis method may indicate the existence of the header A included in the EDMG part
  • the scrambler initialization field according to the second analysis method may indicate information regarding the spatial transmission mode
  • Table 1 is a definition of a scrambler initialization field according to a first analysis method
  • Table 2 is a definition of a scrambler initialization field according to a second analysis method.
  • the scrambler initialization field is defined as Table 1 according to the first analysis method, and thus, the scrambler initialization field indicates whether the header A included in the EDMG part is present.
  • the scrambler initialization field is defined in Table 2 according to the second analysis method, and thus the scrambler initialization field may indicate information regarding the spatial transmission mode.
  • the information on the spatial transmission mode indicated by the scrambler initialization field is a format indicating the index of the antenna mode-related information and the transmission sector combination for at least one requested channel bandwidth as shown in Table 2. It can be composed of.
  • the scrambler initialization field is '0000'
  • the channel bandwidth applied to the transmission of the data frame is 2.16 GHz
  • the antenna mode SISO, and indicates that the transmission sector combination is not used.
  • the scrambler initialization field is '1011'
  • the channel bandwidth applied to the transmission of the data frame is 4.32 GHz
  • the antenna mode MIMO, and indicates that the transmission sector combination index # 1 is used.
  • the initiator can indicate information regarding the spatial transmission mode to be applied to the transmission of the data frame by appropriately setting the return field and the scrambler initialization field.
  • the responder may derive an analysis method of the scrambler initialization field through the return field, and check information on the spatial transmission mode from the scrambler initialization field according to the derived analysis method.
  • Table 3 is a definition of a scrambler initialization field according to a second analysis method according to another example.
  • the number of streams and channel bonding used for the transmission of the data frame according to the present embodiment is two.
  • the responder After receiving the PPDU frame, the responder extracts the L-header and checks the contents indicated by the return field of the L-header to confirm that the scrambler initialization field is defined as the second analysis method. Then, the responder acquires information on the spatial transmission mode by interpreting the scrambler initialization field based on the second analysis method.
  • the operation of the initiator is performed by the communication unit 1140 of the wireless data transmission device 1100, and the operation of the responder is It may be performed by the communication unit 1210 of the wireless data receiving device 1200.
  • the operation of the initiator is performed by the communication unit 1210 of the wireless data receiving apparatus 1200, and the responder The operation may be performed by the communication unit 1140 of the wireless data transmission device 1100.
  • the above embodiment can provide excellent performance in an environment in which a data transmission section through a beamforming training section and a MIMO channel access may drop for a certain period of time.
  • the best spatial transmission mode is derived for the current communication environment as a result of the beamforming training, the communication environment may change when a certain time has elapsed without data transmission immediately after the beamforming training process.
  • the existing optimal spatial transmission mode is no longer valid.
  • the initiator and the responder need to operate in an optimal spatial transmission mode even in this situation. Therefore, the initiator and the responder can adaptively apply the spatial transmission mode by first exchanging information on the spatial transmission mode before transmission of the data frame is started.
  • the procedure can be further simplified by omitting at least some of the procedures of the embodiment.
  • the initiator of the beamforming training section operates as a TXOP holder in the data transmission section, and the change in the channel between the initiator and the responder is not large compared to the beamforming training section.
  • the initiator can immediately transmit a data frame based on the optimal spatial transmission mode calculated through the beamforming training process. That is, the initiator and the responder operate as a MIMO after the beamforming training process, and the TX sector combination index is fixed to the optimal TX sector combination index calculated through the beamforming training process to transmit a data frame.
  • FIG. 9 illustrates a data communication method based on a beamforming training process according to another embodiment.
  • the initiator and the responder each can store the results of beamforming training.
  • the initiator and the responder can enter the MIMO channel access step after a certain period of time.
  • the initiator When accessing the MIMO channel, the initiator transmits the RTS frame to the responder based on SISO (S905), and the responder transmits the CTS frame to the initiator based on SISO (S910).
  • the initiator When the initiator acquires the transmission opportunity by the RTS / CTS procedure, the initiator sets the antenna mode to MIMO and transmits the PPDU frame according to the optimal transmission sector combination index calculated in step S900 (S915).
  • the responder implicitly knows that the PPDU frame will be transmitted based on MIMO, and already knows the optimal transmission sector combination index by the initiator. Accordingly, the responder can receive the PPDU frame according to the MIMO and the reception sector combination index optimized for the optimal transmission sector combination index. That is, the responder may receive the data frame by changing to an RX AWV (Antenna weight vector) of the optimal transmission sector combination to receive the data frame implicitly and / or fixedly.
  • RX AWV Antenna weight vector
  • the responder can also transmit a data frame or an ACK frame to the initiator based on the index of his optimal transmission sector combination calculated through the beamforming training process (S920).
  • the responder may transmit data frames by setting the antenna mode to MIMO.
  • the responder can transmit the data frame using the optimal combination of transmission sectors calculated through the beamforming training process.
  • the responder can use the optimal transmission sector combination calculated by the initiator for the communication link between the initiator (or transmission opportunity holder) and the responder.
  • the responder can use the optimal transmission sector combination calculated by the responder himself for the communication link between the initiator (or the transmission opportunity holder) and the responder.
  • the embodiment according to FIG. 9 is a case in which a reverse direction grant (RDG) is allowed and a responder can transmit a data frame within the same TXOP with the initiator's permission.
  • RDG reverse direction grant
  • the responder may only transmit a (block) ACK frame.
  • Block The ACK frame is a control information and has a higher reliability than the data frame.
  • the responder may continue to perform transmission based on SISO. That is, the initiator (or TXOP holder) in an environment in which reverse grant is not allowed uses the optimal transmission sector combination that he has calculated for the communication link with the responder, but the responder transmits only in SISO.
  • the operation of the initiator is performed by the communication unit 1140 of the wireless data transmission device 1100
  • the operation of the responder may be performed by the communication unit 1210 of the wireless data receiving device 1200.
  • the operation of the initiator is performed by the communication unit 1210 of the wireless data receiving device 1200
  • the operation of the responder may be performed by the communication unit 1140 of the wireless data transmission device 1100.
  • FIG. 10 shows a data communication method based on a beamforming training process according to another embodiment.
  • the initiator and the responder may respectively store the results of beamforming training.
  • the initiator and the responder immediately enter the transmission step of the data frame or management frame immediately after elapse.
  • the initiator and the responder can directly transmit a data frame or a management frame or a (block) ACK frame (hereinafter referred to as a data frame) without RTS / CTS procedures.
  • the initiator (or TXOP holder) transmits a data frame or the like by setting the antenna mode to MIMO, and transmits a data frame or the like based on an optimal transmission sector combination calculated from the beamforming training result.
  • the responder also transmits a data frame or the like by setting the antenna mode to MIMO, and transmits a data frame or the like based on the optimal combination of transmission sectors calculated from the beamforming training result.
  • the lowest combination of transmission sectors used by the respondents may differ depending on reciprocity.
  • the responder may use the optimal transmission sector combination calculated by the initiator for the communication link between the initiator (or transmission opportunity holder) and the responder.
  • the responder can use the optimal transmission sector combination calculated by the responder himself for the communication link between the initiator (or the transmission opportunity holder) and the responder.
  • the embodiment according to FIG. 10 is a case in which a reverse direction grant (RDG) is allowed and a responder can transmit a data frame within the same TXOP with the initiator's permission. However, if a reverse grant is not allowed, the responder may only transmit a (block) ACK frame. (Block)
  • the ACK frame is a control information and has a higher reliability than the data frame.
  • the responder may continue to perform transmission based on SISO. That is, the initiator (or TXOP holder) in an environment in which reverse grant is not allowed uses the optimal transmission sector combination that he has calculated for the communication link with the responder, but the responder transmits only in SISO.
  • wireless data receiving apparatus and method, or transmitting apparatus and method are not necessarily all of the components or steps, the wireless data receiving apparatus and method, or transmitting apparatus and method, are described above. Or it may be performed including some or all of the steps. In addition, embodiments of the above-described wireless data receiving apparatus and method, or transmitting apparatus and method may be performed in combination with each other. In addition, each component or step described above is not necessarily performed in the order described, it is also possible that the steps described later are performed prior to the steps described first.

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

Abstract

La présente invention concerne un dispositif d'émission de données et un dispositif de réception utilisant de multiples antennes dans un système AV sans fil. La présente invention fait intervenir un dispositif d'émission de données sans fil comportant: une unité de communication servant à réaliser une procédure de mise en forme de faisceau MIMO pendant un intervalle d'émission de données au cours d'un intervalle de balise, à générer une trame d'unité de données de protocole de couche physique (PPDU) comportant séquentiellement un préambule, qui comporte au moins un en-tête, et au moins une unité de données de service de couche physique (PSDU), et à envoyer la trame de PPDU à un dispositif de réception de données au moyen d'un canal sans fil; et un processeur qui est relié à l'unité de communication et qui sert à générer et à fournir, à l'unité de communication, des données AV à émettre au moyen de la trame de données. La commodité de mise en œuvre d'un système peut être favorisée en abandonnant ou en minimisant des informations de surcharge superflues parmi des informations ou une procédure de communication associées au SIMO ou au MIMO.
PCT/KR2019/009470 2018-10-18 2019-07-30 Dispositif d'émission de données et dispositif de réception utilisant de multiples antennes dans un système av sans fil WO2020080654A1 (fr)

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Citations (3)

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Publication number Priority date Publication date Assignee Title
US20050135318A1 (en) * 2003-10-15 2005-06-23 Qualcomm Incorporated High speed media access control with legacy system interoperability
US20170078008A1 (en) * 2015-09-11 2017-03-16 Assaf Kasher Enhanced beamforming training in a wireless local area networks
US20170156067A1 (en) * 2014-08-18 2017-06-01 Panasonic Corporation Mimo training method and wireless device

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US20050135318A1 (en) * 2003-10-15 2005-06-23 Qualcomm Incorporated High speed media access control with legacy system interoperability
US20170156067A1 (en) * 2014-08-18 2017-06-01 Panasonic Corporation Mimo training method and wireless device
US20170078008A1 (en) * 2015-09-11 2017-03-16 Assaf Kasher Enhanced beamforming training in a wireless local area networks

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