WO2020071729A1 - Procédé et appareil pour la transmission d'une trame de véhicule de nouvelle génération dans un système de réseau local sans fil - Google Patents

Procédé et appareil pour la transmission d'une trame de véhicule de nouvelle génération dans un système de réseau local sans fil

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Publication number
WO2020071729A1
WO2020071729A1 PCT/KR2019/012820 KR2019012820W WO2020071729A1 WO 2020071729 A1 WO2020071729 A1 WO 2020071729A1 KR 2019012820 W KR2019012820 W KR 2019012820W WO 2020071729 A1 WO2020071729 A1 WO 2020071729A1
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WIPO (PCT)
Prior art keywords
ngv
frame
band
sig
transmitted
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PCT/KR2019/012820
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English (en)
Korean (ko)
Inventor
임동국
박은성
장인선
최진수
Original Assignee
엘지전자 주식회사
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Publication of WO2020071729A1 publication Critical patent/WO2020071729A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes

Definitions

  • the present specification relates to a technique for transmitting an NGV frame in a wireless LAN system, and more particularly, to a method and apparatus for transmitting an NGV frame in a wideband so that 802.11p and NGV can interoperate in a wireless LAN system.
  • next generation wireless local area network Discussions are being conducted for the next generation wireless local area network (WLAN).
  • WLAN next-generation wireless local area network
  • IEEE Institute of electronic and electronics engineers
  • PHY physical
  • MAC medium access control
  • the goal is to improve performance in real indoor and outdoor environments, such as increasing through put, 3) environments where interference sources exist, dense heterogeneous network environments, and environments with high user loads.
  • next generation WLAN The environment mainly considered in the next generation WLAN is a dense environment with many access points (APs) and stations (STAs), and improvements in spectrum efficiency and area throughput are discussed in this dense environment.
  • APs access points
  • STAs stations
  • improvements in spectrum efficiency and area throughput are discussed in this dense environment.
  • next-generation WLAN it is interested not only in the indoor environment, but also in improving the practical performance in an outdoor environment that is not much considered in the existing WLAN.
  • next generation WLAN there is a great interest in scenarios such as wireless office, smart home, stadium, hotspot, building / apartment, and AP based on the scenario. Discussions are being conducted on improving system performance in a dense environment with many and STAs.
  • next-generation WLAN rather than improving single link performance in one basic service set (BSS), system performance and outdoor environment performance improvement in the overlapping basic service set (OBSS) environment, and cellular offloading will be actively discussed. Is expected.
  • the directionality of the next generation WLAN means that the next generation WLAN will gradually have a technology range similar to that of mobile communication. Considering the situation in which mobile communication and WLAN technology are being discussed together in the small cell and direct-to-direct (D2D) communication areas, the technological and business convergence of next-generation WLAN and mobile communication is expected to become more active.
  • BSS basic service set
  • D2D direct-to-direct
  • This specification proposes a method and apparatus for transmitting an NGV frame in a wireless LAN system.
  • An example of the present specification proposes a method of transmitting an NGV frame.
  • next-generation wireless LAN system is an improved wireless LAN system that can satisfy backward compatibility with the 802.11p system.
  • the next generation wireless LAN system may be referred to as Next Generation V2X (NGV) or 802.11bd.
  • the present embodiment is performed in the transmitting device, and the transmitting device may correspond to the AP.
  • the receiving device of this embodiment may correspond to an NGV STA supporting an NGV or 802.11bd system or an 11p STA supporting an 802.11p system.
  • This embodiment satisfies the interoperability, backward compatibility, or coexistence between the NGV or 802.11bd WLAN system and the legacy 802.11p system, and transmits the NGV signal through broadband (20 MHz or more). Suggest how to do it.
  • the transmitting device generates a NDP (Null Data Packet) frame and the NGV frame.
  • NDP Null Data Packet
  • the transmitting device transmits the NDP frame to the receiving device through a first band.
  • the transmitting device transmits the NGV frame through the first band after the NDP frame is transmitted.
  • the NGV frame may be transmitted after the NDP frame is transmitted and after Short Inter Frame Space (SIFS).
  • SIFS Short Inter Frame Space
  • the NDP frame is a frame generated to transmit the NGV frame in the first band. That is, the transmitting device may inform that the NGV frame will be transmitted in the first band (the 20 MHz band, the same band in which the NDP frame is transmitted) by transmitting the NDP frame in the first band (20 MHz band). have.
  • the NDP frame when the NDP frame is transmitted in the first band, it may be transmitted by being duplicated in units of a second band.
  • the first band is a 20 MHz band
  • the second band is a 10 MHz band. That is, the NDP frame is composed of 10 MHz band (or channel) units, and for transmission in the 20 MHz band, the NDP frame transmitted in the 10 MHz band may be copied once and then transmitted.
  • an NGV frame is configured to interoperate with 802.11p and NGV, thereby eliminating interference between each other and transmitting an NGV frame in a 20MHz band, thereby improving throughput and securing a fast communication speed.
  • WLAN wireless local area network
  • FIG. 2 is a diagram showing an example of a PPDU used in the IEEE standard.
  • FIG. 3 is a diagram showing an example of an HE PPDU.
  • FIG. 4 is a diagram showing the arrangement of a resource unit (RU) used on a 20MHz band.
  • RU resource unit
  • FIG. 5 is a view showing the arrangement of a resource unit (RU) used on the 40MHz band.
  • RU resource unit
  • FIG. 6 is a view showing the arrangement of a resource unit (RU) used on the 80MHz band.
  • RU resource unit
  • FIG. 7 is a view showing another example of the HE-PPDU.
  • FIG. 8 is a block diagram showing an example of HE-SIG-B according to the present embodiment.
  • FIG. 9 shows an example of a trigger frame.
  • FIG. 10 shows an example of a subfield included in a per user information field.
  • FIG. 11 is a block diagram showing an example of a control field and a data field constructed according to the present embodiment.
  • FIG. 12 is a view showing an example of HE TB PPDU.
  • FIG. 13 shows a MAC frame format used in a wireless LAN system.
  • FIG. 14 shows an A-MPDU format used in a wireless LAN system.
  • 16 shows a frame format of an 802.11p system.
  • 17 shows an example of the NGV PPDU format.
  • FIG. 20 shows an example of an NGV PPDU format transmitted in a 20 MHz band using a CTS frame.
  • FIG. 21 shows an example of an NGV PPDU format transmitted in a 20 MHz band using an NGV NDP frame.
  • FIG. 22 shows an example of an NGV PPDU format transmitted in a 20 MHz band using a trigger frame.
  • FIG. 23 is a flowchart illustrating a procedure for transmitting an NGV frame in a transmission apparatus according to the present embodiment.
  • 24 is a flowchart illustrating a procedure for receiving an NGV frame in a receiving device according to the present embodiment.
  • 25 is a view for explaining an apparatus for implementing the method as described above.
  • 26 shows a more detailed wireless device implementing an embodiment of the present invention.
  • WLAN wireless local area network
  • FIG. 1 shows the structure of an infrastructure basic service set (BSS) of the Institute of Electrical and Electronic Engineers (IEEE) 802.11.
  • BSS infrastructure basic service set
  • IEEE Institute of Electrical and Electronic Engineers
  • the wireless LAN system may include one or more infrastructure BSSs 100 and 105 (hereinafter, BSS).
  • BSS (100, 105) is a set of APs and STAs such as an access point (AP) 125 and an STA1 (Station 100-1) that can successfully communicate with each other through synchronization, and is not a concept indicating a specific area.
  • the BSS 105 may include one or more combineable STAs 105-1 and 105-2 in one AP 130.
  • the BSS may include at least one STA, APs 125 and 130 providing distributed services, and a distributed system (DS, 110) connecting multiple APs.
  • DS distributed system
  • the distributed system 110 may connect multiple BSSs 100 and 105 to implement an extended service set (ESS) 140.
  • ESS 140 may be used as a term indicating one network in which one or more APs 125 and 230 are connected through the distributed system 110.
  • APs included in one ESS 140 may have the same service set identification (SSID).
  • the portal 120 may serve as a bridge that performs a connection between a wireless LAN network (IEEE 802.11) and another network (eg, 802.X).
  • IEEE 802.11 IEEE 802.11
  • 802.X another network
  • a network between APs 125 and 130 and a network between APs 125 and 130 and STAs 100-1, 105-1, and 105-2 may be implemented.
  • a network that establishes a network even between STAs without APs 125 and 130 to perform communication is defined as an ad-hoc network or an independent basic service set (BSS).
  • 1 is a conceptual diagram showing IBSS.
  • the IBSS is a BSS operating in an ad-hoc mode. Since IBSS does not include an AP, there is no centralized management entity performing central management functions. That is, STAs 150-1, 150-2, 150-3, 155-4, and 155-5 in the IBSS are managed in a distributed manner. In IBSS, all STAs (150-1, 150-2, 150-3, 155-4, 155-5) can be made of mobile STAs, and access to a distributed system is not allowed, so a self-contained network (self-contained) network).
  • STA is an arbitrary functional medium including a medium access control (MAC) and a physical layer interface to a wireless medium in accordance with the Institute of Electrical and Electronics Engineers (IEEE) 802.11 standard. Can be used as a meaning including both an AP and a non-AP STA (Non-AP Station).
  • MAC medium access control
  • IEEE Institute of Electrical and Electronics Engineers
  • the STA includes a mobile terminal, a wireless device, a wireless transmit / receive unit (WTRU), user equipment (UE), mobile station (MS), and mobile subscriber unit ( Mobile Subscriber Unit) or simply a user (user).
  • WTRU wireless transmit / receive unit
  • UE user equipment
  • MS mobile station
  • Mobile Subscriber Unit Mobile Subscriber Unit
  • the term user may be used in various meanings, and may also be used to mean an STA participating in uplink MU MIMO and / or uplink OFDMA transmission in wireless LAN communication, for example. It is not limited thereto.
  • FIG. 2 is a diagram showing an example of a PPDU used in the IEEE standard.
  • PDU protocol data units As shown, various types of PDU protocol data units (PPDUs) have been used in standards such as IEEE a / g / n / ac. Specifically, the LTF and STF fields included training signals, and SIG-A and SIG-B included control information for the receiving station, and data fields included user data corresponding to PSDU.
  • PPDUs PDU protocol data units
  • This embodiment proposes an improved technique for the signal (or control information field) used for the data field of the PPDU.
  • the signal proposed in this embodiment may be applied on a high efficiency PPDU (HE PPDU) according to the IEEE 802.11ax standard. That is, the signal to be improved in this embodiment may be HE-SIG-A and / or HE-SIG-B included in the HE PPDU. Each of HE-SIG-A and HE-SIG-B can also be marked as SIG-A, SIG-B.
  • the improved signal proposed by the present embodiment is not necessarily limited to the HE-SIG-A and / or HE-SIG-B standards, and control of various names including control information in a wireless communication system for transmitting user data / Applicable to data fields.
  • FIG. 3 is a diagram showing an example of an HE PPDU.
  • the control information field proposed in this embodiment may be HE-SIG-B included in the HE PPDU as shown in FIG. 3.
  • the HE PPDU according to FIG. 3 is an example of a PPDU for multiple users, HE-SIG-B is included only for multiple users, and a corresponding HE-SIG-B may be omitted in a PPDU for a single user.
  • HE-PPDU for multiple users is a legacy-short training field (L-STF), legacy-long training field (L-LTF), legacy-signal (L-SIG), High efficiency-signal A (HE-SIG-A), high efficiency-signal-B (HE-SIG-B), high efficiency-short training field (HE-STF), high efficiency-long training field (HE-LTF) , Data field (or MAC payload) and PE (Packet Extension) field.
  • L-STF legacy-short training field
  • L-LTF legacy-long training field
  • L-SIG legacy-signal
  • HE-SIG-A High efficiency-signal A
  • HE-SIG-B high efficiency-short training field
  • HE-LTF high efficiency-long training field
  • PE Packet Extension
  • FIG. 4 is a diagram showing the arrangement of a resource unit (RU) used on a 20MHz band.
  • RU resource unit
  • Resource Units corresponding to different numbers of tones (ie, subcarriers) may be used to configure some fields of the HE-PPDU. For example, resources may be allocated in units of RU shown for HE-STF, HE-LTF, and data fields.
  • 26-units i.e., units corresponding to 26 tones
  • Six tones may be used as a guard band in the leftmost band of the 20 MHz band, and five tones may be used as a guard band in the rightmost band of the 20 MHz band.
  • 7 DC tones are inserted in the central band, that is, the DC band, and 26-units corresponding to 13 tones may exist in the left and right sides of the DC band.
  • 26-unit, 52-unit, and 106-unit may be allocated to other bands.
  • Each unit can be assigned for a receiving station, ie a user.
  • the RU arrangement of FIG. 4 is utilized not only for a situation for multiple users (MU), but also for a situation for single users (SU).
  • MU multiple users
  • SU single users
  • one 242-unit is used. It is possible to use and in this case 3 DC tones can be inserted.
  • FIG. 5 is a view showing the arrangement of a resource unit (RU) used on the 40MHz band.
  • RU resource unit
  • examples of FIG. 5 may also be 26-RU, 52-RU, 106-RU, 242-RU, 484-RU, and the like.
  • 5 DC tones can be inserted into the center frequency, 12 tones are used as a guard band in the leftmost band of the 40 MHz band, and 11 tones are used in a rightmost band of the 40 MHz band. It can be used as a guard band.
  • 484-RU when used for a single user, 484-RU can be used. Meanwhile, the fact that the specific number of RUs can be changed is the same as the example of FIG.
  • FIG. 6 is a view showing the arrangement of a resource unit (RU) used on the 80MHz band.
  • RU resource unit
  • examples of FIG. 6 may also be 26-RU, 52-RU, 106-RU, 242-RU, 484-RU, 996-RU, etc. have.
  • 7 DC tones may be inserted into the center frequency, 12 tones are used in the leftmost band of the 80 MHz band as a guard band, and 11 tones in the rightmost band of the 80 MHz band. It can be used as a guard band. It is also possible to use 26-RUs with 13 tones located on the left and right sides of the DC band.
  • 996-RU when used for a single user, 996-RU can be used, in which case 5 DC tones can be inserted.
  • FIG. 7 is a view showing another example of the HE-PPDU.
  • the illustrated block of FIG. 7 is another example of explaining the HE-PPDU block of FIG. 3 in terms of frequency.
  • the illustrated L-STF 700 may include a short training orthogonal frequency division multiplexing symbol (OFDM).
  • the L-STF 700 may be used for frame detection, automatic gain control (AGC), diversity detection, and coarse frequency / time synchronization.
  • AGC automatic gain control
  • the L-LTF 710 may include a long training orthogonal frequency division multiplexing symbol (OFDM). L-LTF 710 may be used for fine frequency / time synchronization and channel prediction.
  • OFDM orthogonal frequency division multiplexing symbol
  • L-SIG 720 may be used to transmit control information.
  • the L-SIG 720 may include information on a data transmission rate and a data length. Also, the L-SIG 720 may be repeatedly transmitted. That is, the L-SIG 720 may be configured in a repeating format (eg, R-LSIG).
  • the HE-SIG-A 730 may include control information common to the receiving station.
  • HE-SIG-A 730 includes: 1) a DL / UL indicator, 2) a BSS color field that is an identifier of the BSS, 3) a field indicating the remaining time of the current TXOP section, 4) 20, Bandwidth field indicating whether 40, 80, 160, 80 + 80 MHz, 5) Field indicating MCS technique applied to HE-SIG-B, 6) HE-SIG-B dual subcarrier modulation for MCS ( dual subcarrier modulation) indication field for modulating, 7) field indicating the number of symbols used for HE-SIG-B, 8) indicating whether HE-SIG-B is generated over the entire band.
  • Field, 9) a field indicating the number of symbols of the HE-LTF, 10) a field indicating the length and CP length of the HE-LTF, 11) a field indicating whether there are additional OFDM symbols for LDPC coding, 12) Fields indicating control information on PE (Packet Extension), 13) Fields indicating information on CRC field of HE-SIG-A, and the like. have. Specific fields of the HE-SIG-A may be added or some of them may be omitted. In addition, some fields may be added or omitted in other environments in which HE-SIG-A is not a multi-user (MU) environment.
  • MU multi-user
  • HE-SIG-A 730 may be composed of two parts, HE-SIG-A1 and HE-SIG-A2.
  • HE-SIG-A1 and HE-SIG-A2 included in HE-SIG-A may be defined in the following format structure (field) according to the PPDU.
  • the HE-SIG-A field of the HE SU PPDU may be defined as follows.
  • the HE-SIG-A field of the HE MU PPDU may be defined as follows.
  • the HE-SIG-A field of the HE TB PPDU may be defined as follows.
  • the HE-SIG-B 740 may be included only in the case of a PPDU for multi-users (MUs) as described above.
  • the HE-SIG-A 750 or the HE-SIG-B 760 may include resource allocation information (or virtual resource allocation information) for at least one receiving STA.
  • FIG. 8 is a block diagram showing an example of HE-SIG-B according to the present embodiment.
  • the HE-SIG-B field includes a common field at the beginning, and it is possible to encode the common field separately from the field following it. That is, as shown in FIG. 8, the HE-SIG-B field may include a common field including common control information and a user-specific field including user-specific control information.
  • the common field includes a corresponding CRC field and the like and can be coded into one BCC block.
  • the following user-specific fields may be coded into one BCC block, including a “user-feature field” for two users (2 users) and a CRC field corresponding thereto, as illustrated.
  • the previous field of HE-SIG-B 740 on the MU PPDU may be transmitted in a duplicated form.
  • the HE-SIG-B 740 transmitted in a part of the frequency band is the corresponding frequency band (ie, the fourth frequency band).
  • Control information for a data field in a different frequency band (for example, the second frequency band) except for the data field and the corresponding frequency band may also be included.
  • the HE-SIG-B 740 of a specific frequency band eg, the second frequency band
  • the HE-SIG-B 740 may be transmitted in an encoded form on all transmission resources. Fields after the HE-SIG-B 740 may include individual information for each receiving STA receiving the PPDU.
  • the HE-STF 750 may be used to improve automatic gain control estimation in a multiple input multiple output (MIMO) environment or OFDMA environment.
  • MIMO multiple input multiple output
  • OFDMA orthogonal frequency division multiple access
  • the HE-LTF 760 may be used to estimate a channel in a MIMO environment or OFDMA environment.
  • the size of the FFT / IFFT applied to the fields after the HE-STF 750 and the HE-STF 750 and the size of the FFT / IFFT applied to the fields before the HE-STF 750 may be different.
  • the size of the FFT / IFFT applied to the fields after the HE-STF 750 and the HE-STF 750 may be four times larger than the size of the IFFT applied to the fields before the HE-STF 750. .
  • the field of is referred to as a first field
  • at least one of the data field 770, HE-STF 750, and HE-LTF 760 may be referred to as a second field.
  • the first field may include fields related to legacy systems
  • the second field may include fields related to HE systems.
  • 256 FFT / IFFT is applied for a bandwidth of 20 MHz
  • 512 FFT / IFFT is applied for a bandwidth of 40 MHz
  • 1024 FFT / IFFT is applied for a bandwidth of 80 MHz
  • 2048 FFT for a continuous 160 MHz or discontinuous 160 MHz bandwidth / IFFT can be applied.
  • the first field of the HE PPDU may be applied to a subcarrier spacing of 312.5kHz, which is a conventional subcarrier spacing, and the subcarrier space of 78.125kHz may be applied to the second field of the HE PPDU.
  • the length of the OFDM symbol may be a value obtained by adding the length of the guard interval (GI) to the IDFT / DFT length.
  • the length of the GI can be various values such as 0.4 ⁇ s, 0.8 ⁇ s, 1.6 ⁇ s, 2.4 ⁇ s, 3.2 ⁇ s.
  • the frequency band used by the first field and the frequency band used by the second field are exactly the same, but in reality, they may not completely coincide with each other.
  • the main band of the first field (L-STF, L-LTF, L-SIG, HE-SIG-A, HE-SIG-B) corresponding to the first frequency band is the second field (HE-STF , HE-LTF, Data), but the interface may be inconsistent in each frequency band. This is because it may be difficult to precisely match the boundary surface since a plurality of null subcarriers, DC tones, guard tones, etc. are inserted in the process of arranging RUs as shown in FIGS. 4 to 6.
  • the user may receive the HE-SIG-A 730 and receive instructions for receiving a downlink PPDU based on the HE-SIG-A 730.
  • the STA may perform decoding based on the changed FFT size from the fields after the HE-STF 750 and the HE-STF 750.
  • the STA may stop decoding and set a network allocation vector (NAV).
  • NAV network allocation vector
  • the cyclic prefix (CP) of the HE-STF 750 may have a size larger than that of other fields, and the STA may perform decoding on the downlink PPDU by changing the FFT size during the CP period.
  • the data (or frame) transmitted from the AP to the STA is downlink data (or downlink frame), and the data (or frame) transmitted from the STA to the AP is uplink data (or uplink frame). It can be expressed in terms.
  • transmission from the AP to the STA may be expressed in terms of downlink transmission, and transmission from the STA to the AP may be uplink transmission.
  • each PDU (PHY protocol data unit), frame and data transmitted through the uplink transmission can be expressed in terms of downlink PPDU, downlink frame and downlink data.
  • the PPDU may be a data unit including a PPDU header and a physical layer service data unit (PSDU) (or MAC protocol data unit (MPDU)).
  • PSDU physical layer service data unit
  • MPDU MAC protocol data unit
  • the PPDU header may include a PHY header and a PHY preamble
  • the PSDU (or MPDU) may include a frame (or information unit of the MAC layer) or a data unit indicating a frame.
  • the PHY header is a physical layer convergence protocol (PLCP) header in another term, and the PHY preamble may be expressed as a PLCP preamble in other terms.
  • PLCP physical layer convergence protocol
  • each PPDU, frame, and data transmitted through uplink transmission may be expressed in terms of uplink PPDU, uplink frame, and uplink data.
  • an AP may perform downlink (DL) multi-user (DL) transmission based on multiple input multiple output (MU MIMO), and such transmission is termed DL MU MIMO transmission.
  • an orthogonal frequency division multiple access (OFDMA) -based transmission method is supported for uplink transmission and / or downlink transmission. That is, it is possible to perform uplink / downlink communication by allocating data units (eg, RUs) corresponding to different frequency resources to a user.
  • the AP may perform DL MU transmission based on OFDMA, and such transmission may be expressed in terms of DL MU OFDMA transmission.
  • the AP may transmit downlink data (or downlink frame, downlink PPDU) to each of the plurality of STAs through each of the plurality of frequency resources on the overlapped time resource.
  • the plurality of frequency resources may be a plurality of subbands (or subchannels) or a plurality of resource units (RUs).
  • DL MU OFDMA transmission can be used with DL MU MIMO transmission. For example, DL MU MIMO transmission based on a plurality of space-time streams (or spatial streams) is performed on a specific sub-band (or sub-channel) allocated for DL MU OFDMA transmission. Can be.
  • UL MU transmission uplink multi-user transmission
  • uplink transmission on the overlapped time resource by each of the plurality of STAs may be performed on a frequency domain or a spatial domain.
  • different frequency resources may be allocated as uplink transmission resources for each of the plurality of STAs based on OFDMA.
  • Different frequency resources may be different subbands (or subchannels) or different resource units (RUs).
  • Each of the plurality of STAs may transmit uplink data to the AP through different allocated frequency resources.
  • the transmission method through these different frequency resources may be expressed in terms of a UL MU OFDMA transmission method.
  • each of the plurality of STAs When uplink transmission by each of the plurality of STAs is performed on the spatial domain, different space-time streams (or spatial streams) are allocated to each of the plurality of STAs, and each of the plurality of STAs transmits uplink data through different space-time streams. It can be transmitted to the AP.
  • the transmission method through these different spatial streams may be expressed in terms of a UL MU MIMO transmission method.
  • UL MU OFDMA transmission and UL MU MIMO transmission may be performed together.
  • UL MU MIMO transmission based on a plurality of space-time streams (or spatial streams) may be performed on a specific sub-band (or sub-channel) allocated for UL MU OFDMA transmission.
  • a multi-channel allocation method is used to allocate a wide bandwidth (for example, a bandwidth exceeding 20 MHz) to one UE.
  • a single channel unit is 20 MHz
  • a multi-channel may include a plurality of 20 MHz channels.
  • a primary channel rule is used to allocate a wide bandwidth to a terminal.
  • the primary channel rule there is a limitation for allocating a wide bandwidth to the terminal.
  • the STA can use the remaining channels except for the primary channel. Can't.
  • the STA is able to transmit the frame only through the primary channel, and thus is limited in the transmission of the frame through the multi-channel. That is, the primary channel rule used for multi-channel allocation in the existing WLAN system can be a big limitation in attempting to obtain high throughput by operating a wide bandwidth in a current WLAN environment in which OBSS is not small.
  • a wireless LAN system supporting OFDMA technology is disclosed. That is, the OFDMA technique described above for at least one of downlink and uplink is applicable.
  • the above-described MU-MIMO technique for at least one of downlink and uplink is additionally applicable.
  • OFDMA technology When OFDMA technology is used, multiple channels can be simultaneously used by a plurality of terminals rather than a single terminal without limitation due to primary channel rules. Therefore, wide bandwidth operation is possible, and efficiency of radio resource operation can be improved.
  • different frequency resources are increased for each of the plurality of STAs based on OFDMA. It can be allocated as a link transmission resource.
  • different frequency resources may be different subbands (or subchannels) or different resource units (RUs).
  • Different frequency resources for each of the plurality of STAs are indicated through a trigger frame.
  • the trigger frame of FIG. 9 allocates resources for uplink multiple-user transmission (MU transmission) and may be transmitted from the AP.
  • the trigger frame may consist of a MAC frame and may be included in the PPDU. For example, it may be transmitted through the PPDU shown in FIG. 3, the legacy PPDU shown in FIG. 2, or the PPDU specially designed for the trigger frame. If it is transmitted through the PPDU of FIG. 3, the trigger frame may be included in the illustrated data field.
  • Each field illustrated in FIG. 9 may be partially omitted, and other fields may be added. Also, the length of each field may be changed differently from that shown.
  • the frame control field 910 of FIG. 9 includes information on the version of the MAC protocol and other additional control information, and the duration field 920 is time information for NAV setting or an identifier of the terminal (eg For example, AID) may be included.
  • the RA field 930 includes address information of a receiving STA of a corresponding trigger frame, and may be omitted if necessary.
  • the TA field 940 includes address information of an STA (eg, AP) that transmits the trigger frame, and the common information field 950 is applied to a receiving STA that receives the trigger frame.
  • a field indicating the length of the L-SIG field of the uplink PPDU transmitted corresponding to the trigger frame or the SIG-A field of the uplink PPDU transmitted corresponding to the trigger frame ie, HE-SIG-A Field
  • the common control information information on the length of the CP of the uplink PPDU transmitted corresponding to the trigger frame or information on the length of the LTF field may be included.
  • the individual user information field may be called an “assignment field”.
  • the trigger frame of FIG. 9 may include a padding field 970 and a frame check sequence field 980.
  • Each of the individual user information (per user information) fields 960 # 1 to 960 # N shown in FIG. 9 preferably includes a plurality of sub-fields again.
  • FIG. 10 shows an example of a sub-field included in a common information field. Some of the subfields of FIG. 10 may be omitted, and other subfields may be added. Also, the length of each of the illustrated sub-fields can be changed.
  • the trigger type field 1010 of FIG. 10 may indicate a trigger frame variant and encoding of a trigger frame variant.
  • the trigger type field 1010 may be defined as follows.
  • the uplink bandwidth (UL BW) field 1020 of FIG. 10 indicates the bandwidth in the HE-SIG-A field of the HE trigger-based (TB) PPDU.
  • the UL BW field 1020 may be defined as follows.
  • the guard interval (Guard Interval, GI) and LTF type field 1030 of FIG. 10 indicate the GI and HE-LTF types of the HE TB PPDU response.
  • the GI and LTF type field 1030 may be defined as follows.
  • the MU-MIMO LTF mode field 1040 of FIG. 10 indicates the LTF mode of the UL MU-MIMO HE TB PPDU response.
  • the MU-MIMO LTF mode field 1040 may be defined as follows.
  • the MU-MIMO LTF mode field 1040 is an HE single stream pilot HE-LTF mode or HE masked HE-LTF sequence mode It is indicated as one of the.
  • the MU-MIMO LTF mode field 1040 is indicated as the HE single stream pilot HE-LTF mode.
  • the MU-MIMO LTF mode field 1040 may be defined as follows.
  • FIG. 11 shows an example of a subfield included in a per user information field. Some of the sub-fields of FIG. 11 may be omitted, and other sub-fields may be added. Also, the length of each of the illustrated sub-fields can be changed.
  • the user identifier (User Identifier) field of FIG. 11 indicates an identifier of a STA (ie, a receiving STA) to which individual user information (per user information) corresponds, and an example of the identifier is all of the AID or It can be a part.
  • a RU Allocation field 1120 may be included. That is, when the receiving STA identified by the user identifier field 1110 transmits an uplink PPDU in response to the trigger frame of FIG. 9, the corresponding uplink PPDU through the RU indicated by the RU Allocation field 1120 To send.
  • the RU indicated by the RU Allocation field 1120 preferably indicates the RU shown in FIGS. 4, 5, and 6. The configuration of the specific RU allocation field 1120 will be described later.
  • the sub-field of FIG. 11 may include a (UL FEC) coding type field 1130.
  • the coding type field 1130 may indicate a coding type of an uplink PPDU transmitted in response to the trigger frame of FIG. 9. For example, when BCC coding is applied to the uplink PPDU, the coding type field 1130 is set to '1', and when LDPC coding is applied, the coding type field 1130 is set to '0'. You can.
  • the sub-field of FIG. 11 may include a UL MCS field 1140.
  • the MCS field 1140 may indicate an MCS technique applied to an uplink PPDU transmitted in response to the trigger frame of FIG. 9.
  • the sub-field of FIG. 11 may include a trigger dependent user info field 1150.
  • the trigger dependent user information field 1150 includes MPDU MU Spacing Factor subfield (2 bits), TID Aggregation Limit subfield (3 bits), Reserved sub It may include a field (1 bit) and a Preferred AC subfield (2 bits).
  • the control field improved by the present specification includes a first control field including control information required to interpret the PPDU and a second control field including control information for demodulating the data field of the PPDU. do.
  • the first and second control fields may be various fields.
  • the first control field may be HE-SIG-A 730 illustrated in FIG. 7
  • the second control field may be HE-SIG-B 740 illustrated in FIGS. 7 and 8. You can.
  • control identifier inserted in the first control field or the second control field is proposed.
  • the size of the control identifier may be various, for example, it may be implemented as 1-bit information.
  • the control identifier may indicate whether 242-RU is allocated when, for example, 20 MHz transmission is performed.
  • various sizes of RUs may be used. These RUs can be roughly divided into two types of RUs. For example, all RUs shown in FIGS. 4 to 6 may be divided into 26-type RUs and 242-type RUs.
  • a 26-type RU may include 26-RU, 52-RU, 106-RU, and a 242-type RU may include 242-RU, 484-RU, and larger RU.
  • the control identifier may indicate that 242-type RU is used. That is, 242-RU may be included or 484-RU or 996-RU may be included. If the transmission frequency band in which the PPDU is transmitted is a 20 MHz band, 242-RU is a single RU corresponding to the full bandwidth of the transmission frequency band (ie, 20 MHz) band. Accordingly, the control identifier (eg, 1-bit identifier) may indicate whether a single RU corresponding to a full bandwidth of a transmission frequency band is allocated.
  • the control identifier e.g., 1-bit identifier
  • the control identifier is assigned to a single RU corresponding to all bands of the transmission frequency band (i.e., 40MHz band) Can instruct. That is, it may indicate whether or not 484-RU is allocated for 40MHz transmission.
  • the control identifier eg, 1-bit identifier
  • the control identifier has been assigned a single (single) RU corresponding to the entire band (ie, 80MHz band) of the transmission frequency band Can instruct. That is, it may indicate whether 996-RU is allocated for 80 MHz transmission.
  • control identifier for example, a 1-bit identifier
  • the allocation information of the RU is omitted. That is, since only one RU is allocated to all bands of the transmission frequency band, not a plurality of RUs, it is possible to omit the allocation information of the RU.
  • full-band multi-user MIMO Full Bandwidth MU-MIMO
  • Full Bandwidth MU-MIMO Full Bandwidth MU-MIMO
  • the control identifier eg, 1-bit identifier
  • the common field included in the second control field may include an RU allocation subfield. According to the PPDU bandwidth, the common field may include multiple RU allocation subfields (including N RU allocation subfields).
  • the format of the common field can be defined as follows.
  • the RU allocation subfield included in the common field of the HE-SIG-B is composed of 8 bits, and can be indicated as follows for a 20 MHz PPDU bandwidth.
  • RU allocation to be used in the data portion in the frequency domain indicates the size of the RU and the placement of the RU in the frequency domain as an index.
  • the mapping of the 8-bit RU allocation subfield for RU allocation and the number of users per RU may be defined as follows.
  • the user-specific field included in the second control field may include a user field, a CRC field, and a tail field.
  • the format of the user-specific field can be defined as follows.
  • the user-specific field of the HE-SIG-B is composed of multiple user fields.
  • the multiple user fields are located after the common field of the HE-SIG-B.
  • the location of the RU allocation subfield of the common field and the user field of the user-specific field together identifies the RU used to transmit the STA's data. Multiple RUs designated as a single STA are not allowed in a user-specific field. Therefore, signaling that enables the STA to decode its data is delivered in only one user field.
  • the RU allocation subfield is indicated by 8 bits of 01000010, indicating that 5 26-tone RUs are arranged after one 106-tone RU, and 3 user fields are included in the 106-tone RU.
  • the 106-tone RU may support multiplexing of three users.
  • the 8 user fields included in the user-specific field are mapped to 6 RUs, the first 3 user fields are assigned as MU-MIMO in the first 106-tone RU, and the remaining 5 user fields are 5 26- It may indicate that the tone is assigned to each RU.
  • the User field included in the user-specific field of the HE-SIG-B may be defined as follows. First, the user field for non-MU-MIMO allocation is as follows.
  • FIG. 12 is a view showing an example of the HE TB PPDU.
  • the PPDU of FIG. 12 represents an uplink PPDU transmitted in response to the trigger frame of FIG. 9.
  • At least one STA that has received the trigger frame from the AP may check the common information field and individual user information field of the trigger frame and transmit HE TB PPDU simultaneously with other STAs that have received the trigger frame.
  • the PPDU of FIG. 12 includes various fields, and each field corresponds to the fields shown in FIGS. 2, 3, and 7. Meanwhile, as illustrated, the HE TB PPDU (or uplink PPDU) of FIG. 12 may not include the HE-SIG-B field but only the HE-SIG-A field.
  • CSMA / CA carrier sense multiple access / collision avoidance
  • IEEE 802.11 communication is performed in a shared wireless medium, so it has fundamentally different characteristics from a wired channel environment.
  • CSMA / CD carrier sense multiple access / collision detection
  • the channel environment does not change significantly, so Rx is transmitted without undergoing a large signal attenuation.
  • detection was possible. This is because the power sensed at the Rx stage is instantaneously greater than the power transmitted at Tx.
  • various factors for example, signal attenuation may be large depending on distance or may experience instantaneous deep fading) affect the channel.
  • DCF distributed coordination function
  • CSMA / CA carrier sense multiple access / collision avoidance
  • the random backoff period enables collision avoidance, because assuming that there are several STAs for transmitting data, each STA has a different probability of backoff interval and eventually has a different transmission time. to be. When one STA starts transmitting, other STAs cannot use the medium.
  • the random backoff time and procedure are as follows. When a certain medium changes from busy to idle, several STAs start preparing to send data. At this time, in order to minimize collision, STAs that want to transmit data each select a random backoff count and wait for the slot time.
  • the random backoff count is a pseudo-random integer value, and one of the uniform distribution values in the [0 CW] range is selected.
  • CW stands for contention window.
  • the CW parameter takes the CWmin value as the initial value, but if the transmission fails, the value is doubled. For example, if an ACK response for a transmitted data frame is not received, collision may be considered.
  • the STA selects a random backoff count within the [0 CW] range and continuously monitors the medium while the backoff slot counts down. In the meantime, when the medium becomes busy, the count down is stopped. When the medium becomes idle again, the countdown of the remaining backoff slot is resumed.
  • the PHY transmit procedure is converted to a single PSDU (PHY service data unit) in the PHY stage when a MAC protocol data unit (MPDU) or an Aggregate MPDU (A-MPDU) comes from the MAC stage, and preamble and tail bits, padding bits (if necessary) ), And this is called a PPDU.
  • MPDU MAC protocol data unit
  • A-MPDU Aggregate MPDU
  • the PHY receive procedure is usually as follows. When energy detection and preamble detection (L / HT / VHT / HE-preamble detection for each Wifi version) are performed, information on PSDU configuration is obtained from the PHY header (L / HT / VHT / HE-SIG), MAC header is read, and data Read
  • FIG. 13 shows a MAC frame format used in a wireless LAN system.
  • the MAC frame format 1310 includes a set of fields occurring in a fixed order in all frames. 13 shows a general MAC frame format.
  • the first three fields of FIG. 13 (frame control, duration / ID and address 1) and the last field (FCS) constitute a minimum frame format and are reserved. It is present in all frames, including types and subtypes.
  • the Address 2, Address 3, Sequence Control, Address 4, QoS Control, HT Control and Frame Body fields are It is only present in certain frame types and subtypes.
  • FIG. 13 also shows a frame control field 1320 included in the MAC frame format.
  • the first three subfields of the frame control field 1320 are a protocol version, a type, and a subtype.
  • the remaining subfields of the frame control field may vary according to the settings of the Type and Subtype subfields.
  • the remaining subfields in the frame control field are To DS, From DS, More Fragments, Retry, Power Management, More Data, Protected Frame and + HTC / Contains the Order subfield.
  • the format of the frame control field is shown at the bottom of FIG. 13.
  • the remaining subfields in the frame control field include Control Frame Extension, Power Management, More Data, Protected Frame, and + HTC / Order subfields (not shown) city).
  • A- MPDU (Aggregate MPDU )
  • FIG. 14 shows an A-MPDU format used in a wireless LAN system.
  • the A-MPDU 1410 is composed of a sequence of one or more A-MPDU subframes and EOF padding having various sizes, as shown in FIG. 14.
  • Each A-MPDU subframe 1420 is optionally configured with an MPDU delimiter 1440 followed by (following) the MPDU.
  • Each non-final A-MPDU subframe of the A-MPDU adds padding octets to make the subframe a multiple of 4 octets long. The content of this octet has not been determined.
  • the final A-MPDU subframe is not padded.
  • the EOF padding field is only present in the VHT PPDU.
  • the EOF padding subframe subfield includes zero or more EOF padding subframes.
  • the EOF padding subframe is an A-MPDU subframe having 0 in the MPDU Length field and 1 in the EOF field.
  • padding may be determined according to the following rules.
  • A-MPDU pre-EOF padding corresponds to A-MPDU content that does not include the EOF padding field.
  • A-MPDU pre-EOF padding includes all A-MPDU subframes with 0 in the MPDU Length field and 0 in the EOF field to meet the minimum MPDU start interval requirement.
  • the MPDU delimiter 1440 has a length of 4 octets, and the MPDU delimiter 1440 of FIG. 14 shows the structure of the MPDU delimiter transmitted by the non-DMG STA.
  • the structure of the MPDU delimiter transmitted by the DMG STA is a structure in which the EOF subfield is removed from the MPDU delimiter transmitted by the non-DMG STA (not shown).
  • the contents of the MPDU delimiter (1440, non-DMG) can be defined as follows.
  • the 5.9 GHz DSRC is a short-to-medium-range communications service that supports both public safety and private work in vehicles and vehicle-to-vehicle communication environments on the roadside.
  • DSRC is intended to complement cellular communication by providing very high data rates in situations where it is important to minimize the latency of the communication link and to isolate the relatively small communication area.
  • the PHY and MAC protocols are based on the IEEE 802.11p amendment for wireless access in a vehicle environment (WAVE).
  • 802.11p uses the PHY of 802.11a by 2x down clocking. That is, a signal is transmitted using a 10 MHz bandwidth instead of a 20 MHz bandwidth. Numerology comparing 802.11a and 802.11p is as follows.
  • Channel 15 shows a band plan of 5.9 GHz DSRC.
  • Channels of the DSRC band include a control channel and a service channel, and data transmission of 3,4.5,6,9,12,18,24,27 Mbps, respectively. This is possible. If there is an optional 20MHz channel, transmission of 6,9,12,18,24,36,48,54 Mbps is possible. 6,9,12 Mbps must be supported in all services and channels.
  • the control channel the preamble is 3 Mbps, but the message itself is 6 Mbps.
  • Channels 174 and 176 and channels 180 and 182 are channels 175 and 181 at 20 MHz, respectively, if authorized by a frequency coordination agency. The rest is reserved for future use.
  • OBUs On Board Units
  • Channel 178 is a control channel, and all OBUs automatically search for a control channel and receive notification, data transmission, and warning messages from the RSU (Road Side Unit). All data of the control channel must be transmitted within 200ms and repeated at a predefined cycle. In the control channel, public safety alerts take precedence over all private messages. Private messages larger than 200ms are transmitted over the service channel.
  • Private messages or long public safety messages are transmitted through the service channel.
  • a channel sensing method (Carrier Sense Multiple Access) is used before transmission.
  • OCB mode means a state in which direct communication between nodes is possible without a procedure associated with the AP.
  • the following shows a set of basic EDCA parameters for STA operation when dot11OCBActivated is true.
  • OCB mode The characteristics of OCB mode are as follows.
  • a STA is not required to synchronize to a common clock or to use these mechanisms
  • -STAs may maintain a TSF timer for purposes other than synchronization
  • the STA may send Action frames and, if the STA maintains a TSF Timer, Timing Advertisement frames
  • the STA may send Control frames, except those of subtype PS-Poll, CF-End, and CF-End + CFAck
  • the STA may send Data frames of subtype Data, Null, QoS Data, and QoS Null
  • a STA with dot 11 OCBActivated equal to true shall not join or start a BSS
  • the proposed system NGV (next generation vehicular) to support 2x throughput improvement and high speed compared to the 11p system used for V2X can transmit signals using wide bandwidth.
  • This specification proposes a method for transmitting a signal using a 20MHz bandwidth for improved performance in NGV.
  • NGV In order to support V2X smoothly in the 5.9GHz band, technology development for NGV considering DSRC (11p) throughput improvement and high speed support is in progress, and wide bandwidth (20MHz) transmission rather than existing 10MHz transmission is considered for 2x throughput improvement. have. In addition, NGV must support at least one operation such as interoperability / backward compatibility / coexistence with existing 11p. Therefore, there is a need for a transmission method that supports the above operation and transmits a signal using a 20 MHz band. This specification supports the operation and proposes a method for transmitting a signal using a 20MHz bandwidth.
  • the 802.11p packet supporting inter-vehicle communication in the 5.9 GHz band is constructed by applying 11a OFDM numerology to the 10 MHz band, and uses the frame format shown in FIG. 16.
  • 16 shows a frame format of an 802.11p system.
  • the 11p frame is composed of a STF for sync and AGC, an LTF for channel estimation, and a SIG field including information on a data field.
  • the data field includes a service field, and the service field is composed of 16 bits.
  • the 11p frame is configured by applying the same OFDM numerology to 11a for a 10MHz band, so it has a longer symbol duration than 11a (one symbol duration is 8us). That is, the frame of 11p is twice as long as the frame of 11a in terms of time.
  • 17 shows an example of the NGV PPDU format.
  • the proposed 10MHz NGV frame for improving throughput and supporting high speed compared to 11p using the frame format of FIG. 16 may be configured as shown in FIG. 17.
  • the NGV PPDU of FIG. 17 may include a preamble part of 11p for backward compatibility with 11p.
  • the STF, LTF and SIG constituting 11p preamble for backward compatibility with 11p using the 5.9 GHz band at the top of the frame. Put it in front to form a frame.
  • a frame may be composed of NGV-data and symbols constituting NGV-SIG, NGV-STF, and NGV-LTF, which contain control information for NGV.
  • FIG. 17 is an example of an NGV frame format, and it may be considered to add an OFDM symbol to distinguish NGV frames after L-part (L-STF, L-LTF, and L-SIG). That is, it may be configured in a structure as shown in FIG.
  • OFDM symbols for indicating an NGV frame format or indicating information on an NGV frame may be placed in front of the NGV control field to form a frame.
  • the number of symbols placed in front of the NGV-SIG may be 1 or more.
  • the NGV part (NGV-STF, NGV-LTF, NGV-data) is composed of symbols having the same symbol length (ie, 156.25khz) as 11p, or longer length (ie, 78.125khz) than 11p symbols. Branches may consist of symbols.
  • a frame format for transmitting a signal using a 20MHz bandwidth may be configured as follows. That is, the 20MHz NGV frame format can be configured based on the 10MHz NGV frame format shown in FIGS. 17 and 18. Also, a 20MHz NGV frame format as shown in FIG. 19 may be configured.
  • L-parts (L-STF, L-LTF, L-SIG and RL-SIG) and NGV-SIG are configured in a duplicated structure in units of 10 MHz channels and NGV part (NGV-STF) , NGV-LTF, NGV-data) is configured based on full 20MHz.
  • NGV-STF NGV part
  • NGV-data NGV part
  • FIG. 19 shows that the RL-SIG field is included between L-SIG and NGV-SIG.
  • the NGV part is transmitted in a wideband width, information about the BW is transmitted through the NGV SIG field, and the NGV STA can know the frame format according to the bandwidth.
  • the frame format for 20 MHz bandwidth transmission configured as described above may be configured as follows.
  • the NGV STA can apply AGC, channel estimation information, etc. performed using the previously received L-part to the NGV part. Therefore, 20MHz channel transmission can be performed using a different frame format.
  • a 20 MHz transmission method is proposed based on the 10 MHz NGV frame format illustrated in FIGS. 17 and 18, or the 20 MHz NGV frame format of FIG. 19 can be used.
  • NGV must support interoperability or backward compatibility with legacy devices when transmitting signals using 20MHz bandwidth. Therefore, in order to support such an operation, NGV indicates that NGV is transmitted through a 20MHz channel before transmitting a signal using a 20MHz channel, or a legacy STA (ie, 11p STA) channel for a 20MHz channel used by NGV. To prevent access, 20MHz bandwidth transmission is performed using the following transmission method.
  • FIG. 20 shows an example of an NGV PPDU format transmitted in a 20 MHz band using a CTS frame.
  • a to E which will be described later, will be described with reference to FIG. 20.
  • the NGV STA / AP transmits a clear-to-send (CTS) frame (eg, CTS to self, CTS to AP).
  • CTS clear-to-send
  • the CTS frame is composed of 10MHz channel units and is copied and transmitted for 20MHz bandwidth transmission.
  • NGV AP / STA transmits NGV signal using 20MHz bandwidth.
  • the legacy STA (that is, 11p STA) can determine that the frame transmitted through the received CTS frame is not transmitted to itself, and also the legacy STA is connected to the CTS frame.
  • the channel may not be accessed during NGV 20MHz transmission by using the included frame information (eg, TXOP / packet length). Therefore, when transmitting NGV 20MHz, interference with the legacy STA can be prevented and interoperability or backward compatibility with the legacy STA can be satisfied.
  • the NGV AP / STA can know that the NGV frame is transmitted through CTS frame reception.
  • the NGV frame transmitted using the 20 MHz bandwidth can perform AGC and channel estimation using L-STF and L-LTF transmitted in the L-part, and thus can be transmitted in the following structure. .
  • the NGV-SIG symbol can transmit a signal using 56 tone available subcarriers.
  • an extra 4 tone (eg, subcarrier index -28, -27, 27, 28) is also used for L-SIG, and the 4 tone is used only for channel estimation.
  • the extra 4 tone for channel estimation can also be used in L-LTF for more accurate channel estimation.
  • the NGV-SIG includes information on NGV data transmission, for example, modulation and coding scheme (MCS), number of space (spatial) time streams (NSTS), encoding, transmission opportunity (TXOP), BSS color, BSS ID, and STA It consists of information such as ID, bandwidth (BW), and channel information (eg, channel index).
  • MCS modulation and coding scheme
  • NSTS number of space (spatial) time streams
  • TXOP transmission opportunity
  • BSS color BSS ID
  • STA STA It consists of information such as ID, bandwidth (BW), and channel information (eg, channel index).
  • 21 shows an example of an NGV PPDU format transmitted in a 20 MHz band using an NGV NDP frame. 21 to A, which will be described later, will be described.
  • the NGV STA / AP transmits an NGV NDP frame before transmitting a 20 MHz bandwidth, wherein the NGV NDP frame is configured as follows.
  • the NGV-SIG includes information on an NGV frame (or NGV PPDU) transmitted after the NGV NDP frame.
  • Information about the NGV frame includes a combination of one or more of BW, MCS, encoding, Number of stream, BSS ID (or BSS color), STA ID, channel information (eg, channel index), TXOP, packet length do.
  • the information on the NGV frame may also include ranging information to know the location through the range of the signal of the NGV frame.
  • the NGV NDP frame is transmitted in 10MHz channel units, and is copied and transmitted when wide bandwidth is transmitted.
  • the legacy STA ie, 11p STA
  • the legacy STA can receive the NGV NDP frame.
  • the legacy STA can also receive the NGV-SIG transmitted after the L-SIG to decode the NGV NDP frame.
  • the NGV STA may receive information on the NGV frame transmitted after the NGV NDP frame through the reception of the NGV NDP frame.
  • SIFS and NGV frame are transmitted. At this time, it is transmitted using 20MHz bandwidth.
  • the NGV frame transmitted after the SIFS may be configured without including the NGV-SIG field.
  • the NGV frame transmitted using the 20 MHz bandwidth can perform AGC and channel estimation using the L-STF and L-LTF transmitted in the L-part, and thus can be transmitted in the following structure. You can.
  • NGV-SIG may not be included in the above structure.
  • more information can be transmitted from the NGV-SIG by using an extra 4 tone (eg, subcarrier index -28, -27, 27, 28) for transmitting a lot of information in the above structure.
  • an extra 4 tone eg, subcarrier index -28, -27, 27, 28
  • the NGV-SIG symbol can transmit a signal using 56 tone available subcarriers.
  • an extra 4 tone (eg, subcarrier index -28, -27, 27, 28) is also used for L-SIG, and 4 tone is used for channel estimation only.
  • the extra 4 tone for channel estimation can also be used in L-LTF for more accurate channel estimation.
  • the Extra 4 tone can also be applied to the NGV NDP frame.
  • FIG. 22 shows an example of an NGV PPDU format transmitted in a 20 MHz band using a trigger frame.
  • a to E which will be described later, will be described with reference to FIG. 22.
  • the NGV device transmits a trigger frame composed of 10MHz channel units before transmitting the 20MHz channel.
  • the trigger frame is configured in 10 MHz channel units, and when wide bandwidth transmission is performed, it is copied and transmitted in 10 MHz channel units.
  • the transmitted trigger frame includes information on the NGV frame transmitted after SIFS.
  • the information on the NGV frame includes information such as BW, MCS, encoding, Number of stream, BSS ID (or BSS color), STA ID, channel information (eg, channel index), TXOP, packet length, and the like.
  • the information on the NGV frame may also include ranging information to know the location through the range of the signal of the NGV frame.
  • the legacy STAs can also be received and NGV transmission can be identified using the information of the frame. Therefore, the legacy STA receiving the trigger frame may not access the channel or set a network allocation vector (NAV) during NGV 20 MHz transmission.
  • NAV network allocation vector
  • the NGV device transmits the trigger frame and transmits the NGV signal using 20MHz bandwidth after SIFS.
  • the NGV frame transmitted after the SIFS may be configured without including the NGV-SIG field.
  • the NGV frame transmitted using the 20 MHz bandwidth can perform AGC and channel estimation using the L-STF and L-LTF transmitted in the L-part, so that the NGV-STF and NGV-LTF It may be transmitted in the following structure without including.
  • NGV-SIG may not be included in the above structure.
  • more information can be transmitted in the NGV-SIG by using an extra 4 tone (eg, subcarrier Index -28, -27, 27, 28) to transmit a lot of control information.
  • an extra 4 tone eg, subcarrier Index -28, -27, 27, 28
  • the NGV-SIG symbol can transmit a signal using 56 tone available subcarriers.
  • an extra 4 tone (eg, subcarrier index -28, -27, 27, 28) is also used for L-SIG, and 4 tone is used for channel estimation only.
  • the extra 4 tone for channel estimation can also be used in L-LTF for more accurate channel estimation.
  • the Extra 4 tone can also be applied to the NGV NDP frame.
  • the value of the L-length field is set to TXOP for an NGV frame transmitted using a 20 MHz channel.
  • the legacy device that received the L-SIG of the L-part transmitted prior to the NGV part can grasp the length of the currently received packet using the length field of the L-SIG.
  • the legacy device After L-SIG decoding and after checking the PPDU, if it is not a PPDU for itself, the legacy device waits for transmission to end as long as the length determined through the L-SIG and tries to access the channel again.
  • An L-length field including TXOP information or packet length information for NGV transmission may be included in a frame transmitted before NGV transmission proposed in the present invention and transmitted.
  • a wide bandwidth in which NGV transmission is performed may be a bandwidth of 20 MHz or more.
  • FIG. 23 is a flowchart illustrating a procedure for transmitting an NGV frame in a transmission apparatus according to the present embodiment.
  • the example of FIG. 23 may be performed in a network environment in which a next generation wireless LAN system is supported.
  • the next-generation wireless LAN system is an improved wireless LAN system that can satisfy backward compatibility with the 802.11p system.
  • the next generation wireless LAN system may be referred to as Next Generation V2X (NGV) or 802.11bd.
  • the example of FIG. 23 is performed by a transmitting device, and the transmitting device may correspond to an AP.
  • the receiving device of FIG. 23 may correspond to an NGV STA supporting an NGV or 802.11bd system or an 11p STA supporting an 802.11p system.
  • This embodiment satisfies the interoperability, backward compatibility, or coexistence between the NGV or 802.11bd WLAN system and the legacy 802.11p system, and transmits the NGV signal through broadband (20 MHz or more). Suggest how to do it.
  • step S2310 the transmitting device generates an NDP (Null Data Packet) frame and the NGV frame.
  • NDP Null Data Packet
  • step S2320 the transmitting device transmits the NDP frame to the receiving device through a first band.
  • step S2330 the transmitting apparatus transmits the NGV frame through the first band after the NDP frame is transmitted.
  • the NGV frame may be transmitted after the NDP frame is transmitted and after Short Inter Frame Space (SIFS).
  • SIFS Short Inter Frame Space
  • the NDP frame is a frame generated to transmit the NGV frame in the first band. That is, the transmitting device may inform that the NGV frame will be transmitted in the first band (the 20 MHz band, the same band in which the NDP frame is transmitted) by transmitting the NDP frame in the first band (20 MHz band). have.
  • the NDP frame when the NDP frame is transmitted in the first band, it may be transmitted by being duplicated in units of a second band.
  • the first band is a 20 MHz band
  • the second band is a 10 MHz band. That is, the NDP frame is composed of 10 MHz band (or channel) units, and for transmission in the 20 MHz band, the NDP frame transmitted in the 10 MHz band may be copied once and then transmitted.
  • the NDP frame may include L-STF (Legacy-Short Training Field), L-LTF (Legacy-Long Training Field), L-SIG (Legacy-Signal) and NGV-SIG. That is, the L-STF, the L-LTF, the L-SIG, and the NGV-SIG may be copied and transmitted in units of the second band.
  • L-STF Legacy-Short Training Field
  • L-LTF Legacy-Long Training Field
  • L-SIG Legacy-Signal
  • NGV-SIG NGV-SIG
  • the NGV-SIG may include control information for the NGV frame.
  • Control information for the NGV frame includes Modulation and Coding Scheme (MCS) information for the NGV frame, Number of Spatial Time Streams (NSTS) information, encoding information, Transmission Opportunity (TXOP) information, and BSS color (Basic Service Set color) Information, BSS identifier information, identifier information of the receiving device, bandwidth information, channel information, packet length (packet length) information, or signal ranging information may be included.
  • MCS Modulation and Coding Scheme
  • NTS Number of Spatial Time Streams
  • TXOP Transmission Opportunity
  • BSS color Basic Service Set color
  • the receiving device may include a legacy STA supporting an 802.11p system or an NGV STA supporting an 802.11bd system.
  • the NDP frame may further include signaling information on whether the NGV frame is transmitted to the legacy STA or the NGV STA. That is, the legacy STA or the NGV STA can determine whether the NGV frame is transmitted to itself by decoding the NDP frame.
  • the receiving device When the receiving device is a legacy STA supporting an 802.11p system, the receiving device (legacy STA) may confirm that the NGV frame is not transmitted to the receiving device based on the NDP frame. Accordingly, channel access of the legacy STA may not be performed on the first band during the period in which the NGV frame is transmitted. The period in which the NGV frame is transmitted may be determined based on TXOP information or packet length information included in the NDP frame.
  • the receiving device may receive the NGV frame through the first band after the NDP frame is transmitted from the transmitting device. That is, the NGV STA can know that the NGV frame is transmitted based on the NDP frame, and can decode the control information for the NGV frame to check information necessary to receive the NGV frame through the 20 MHz band.
  • the NGV frame may include L-STF, L-LTF, L-SIG, Repeated Legacy (RL) -SIG, NGV-SIG, NGV-STF, NGV-LTF and NGV-Data.
  • L-STF, the L-LTF, the L-SIG, the RL-SIG, and the NGV-SIG may be copied and transmitted in units of the second band.
  • the remaining fields, the NGV-STF, the NGV-LTF, and the NGV-Data may be transmitted through the entire 20 MHz band (first band).
  • the transmitting apparatus may transmit information for transmission of the NGV frame by additionally using four subcarriers (or tones) in the NGV-SIG included in the NDP frame.
  • This embodiment describes a method of using an NDP frame to transmit the NGV frame in the 20 MHz band.
  • the transmitting device may be 20MHz using a CTS frame, a trigger frame (which may be newly defined in NGV by adopting a format defined in 802.11ax), or an L-SIG Length field included in the legacy part of the NGV frame. It may inform the transmission of the NGV frame on the band (or channel).
  • the NGV-SIG is DCM (Dual Carrier Modulation), midamble, doppler (doppler), STBC (Space Time Block Coding), coding (coding), LDPC (Low Density Parity Check) additional symbols, CRC ( Cyclical Redundancy Check) and tail bits may further include information.
  • DCM Double Carrier Modulation
  • doppler doppler
  • STBC Space Time Block Coding
  • coding coding
  • LDPC Low Density Parity Check
  • CRC Cyclical Redundancy Check
  • tail bits may further include information.
  • the information on the bandwidth may include information that the WLAN system supports 10 MHz or 20 MHz band.
  • the MCS information may include information supported by the WLAN system up to 256 QAM.
  • the coding information may include information in which the WLAN system supports Binary Convolutional Codes (BCC) or LDPC.
  • 24 is a flowchart illustrating a procedure for receiving an NGV frame in a receiving device according to the present embodiment.
  • the example of FIG. 24 may be performed in a network environment in which a next generation wireless LAN system is supported.
  • the next-generation wireless LAN system is an improved wireless LAN system that can satisfy backward compatibility with the 802.11p system.
  • the next generation wireless LAN system may be referred to as Next Generation V2X (NGV) or 802.11bd.
  • the example of FIG. 24 is performed by a receiving device, and the receiving device may correspond to an NGV STA supporting an NGV or 802.11bd WLAN system or an 11p STA supporting an 802.11p WLAN system.
  • the transmitting device of FIG. 24 may correspond to the AP.
  • This embodiment satisfies the interoperability, backward compatibility, or coexistence between the NGV or 802.11bd WLAN system and the legacy 802.11p system, and transmits the NGV signal through broadband (20 MHz or more). Suggest how to do it.
  • step S2410 the reception device receives a NDP (Null Data Packet) frame from the transmission device through the first band.
  • NDP Null Data Packet
  • step S2420 the reception device determines whether to receive the NGV frame from the transmission device through the first band based on the NDP frame.
  • the NDP frame is a frame generated to transmit the NGV frame in the first band. That is, the transmitting device may inform that the NGV frame will be transmitted in the first band (the 20 MHz band, the same band in which the NDP frame is transmitted) by transmitting the NDP frame in the first band (20 MHz band). have.
  • the NDP frame when the NDP frame is transmitted in the first band, it may be transmitted by being duplicated in units of a second band.
  • the first band is a 20 MHz band
  • the second band is a 10 MHz band. That is, the NDP frame is composed of 10 MHz band (or channel) units, and for transmission in the 20 MHz band, the NDP frame transmitted in the 10 MHz band may be copied once and then transmitted.
  • the NDP frame may include L-STF (Legacy-Short Training Field), L-LTF (Legacy-Long Training Field), L-SIG (Legacy-Signal) and NGV-SIG. That is, the L-STF, the L-LTF, the L-SIG, and the NGV-SIG may be copied and transmitted in units of the second band.
  • L-STF Legacy-Short Training Field
  • L-LTF Legacy-Long Training Field
  • L-SIG Legacy-Signal
  • NGV-SIG NGV-SIG
  • the NGV-SIG may include control information for the NGV frame.
  • Control information for the NGV frame includes Modulation and Coding Scheme (MCS) information for the NGV frame, Number of Spatial Time Streams (NSTS) information, encoding information, Transmission Opportunity (TXOP) information, and BSS color (Basic Service Set color) Information, BSS identifier information, identifier information of the receiving device, bandwidth information, channel information, packet length (packet length) information, or signal ranging information may be included.
  • MCS Modulation and Coding Scheme
  • NTS Number of Spatial Time Streams
  • TXOP Transmission Opportunity
  • BSS color Basic Service Set color
  • the receiving device may include a legacy STA supporting an 802.11p system or an NGV STA supporting an 802.11bd system.
  • the NDP frame may further include signaling information on whether the NGV frame is transmitted to the legacy STA or the NGV STA. That is, the legacy STA or the NGV STA can determine whether the NGV frame is transmitted to itself by decoding the NDP frame.
  • the receiving device When the receiving device is a legacy STA supporting an 802.11p system, the receiving device (legacy STA) may confirm that the NGV frame is not transmitted to the receiving device based on the NDP frame. Accordingly, channel access of the legacy STA may not be performed on the first band during the period in which the NGV frame is transmitted. The period in which the NGV frame is transmitted may be determined based on TXOP information or packet length information included in the NDP frame.
  • the receiving device may receive the NGV frame through the first band after the NDP frame is transmitted from the transmitting device. That is, the NGV STA can know that the NGV frame is transmitted based on the NDP frame, and can decode the control information for the NGV frame to check information necessary to receive the NGV frame through the 20 MHz band.
  • the NGV frame may be received after the NDP frame is received and short inter frame space (SIFS).
  • the NGV frame may include L-STF, L-LTF, L-SIG, Repeated Legacy (RL) -SIG, NGV-SIG, NGV-STF, NGV-LTF and NGV-Data.
  • L-STF, the L-LTF, the L-SIG, the RL-SIG, and the NGV-SIG may be copied and transmitted in units of the second band.
  • the remaining fields, the NGV-STF, the NGV-LTF, and the NGV-Data may be transmitted through the entire 20 MHz band (first band).
  • the transmitting apparatus may transmit information for transmission of the NGV frame by additionally using four subcarriers (or tones) in the NGV-SIG included in the NDP frame.
  • This embodiment describes a method of using an NDP frame to transmit the NGV frame in the 20 MHz band.
  • the transmitting device may be 20MHz using a CTS frame, a trigger frame (which may be newly defined in NGV by adopting a format defined in 802.11ax), or an L-SIG Length field included in the legacy part of the NGV frame. It may inform the transmission of the NGV frame on the band (or channel).
  • the NGV-SIG is DCM (Dual Carrier Modulation), midamble, doppler (doppler), STBC (Space Time Block Coding), coding (coding), LDPC (Low Density Parity Check) additional symbols, CRC ( Cyclical Redundancy Check) and tail bits may further include information.
  • DCM Double Carrier Modulation
  • doppler doppler
  • STBC Space Time Block Coding
  • coding coding
  • LDPC Low Density Parity Check
  • CRC Cyclical Redundancy Check
  • tail bits may further include information.
  • the information on the bandwidth may include information that the WLAN system supports 10 MHz or 20 MHz band.
  • the MCS information may include information supported by the WLAN system up to 256 QAM.
  • the coding information may include information in which the WLAN system supports Binary Convolutional Codes (BCC) or LDPC.
  • 25 is a view for explaining an apparatus for implementing the method as described above.
  • the wireless device 100 of FIG. 25 is a transmission device capable of implementing the above-described embodiment, and may operate as an AP STA.
  • the wireless device 150 of FIG. 25 is a receiving device capable of implementing the above-described embodiment, and may operate as a non-AP STA.
  • the transmitting device 100 may include a processor 110, a memory 120, and a transceiver 130, and the receiving device 150 includes a processor 160, a memory 170, and a transceiver 180 can do.
  • the transmitting and receiving units 130 and 180 transmit / receive wireless signals and may be executed in a physical layer such as IEEE 802.11 / 3GPP.
  • the processors 110 and 160 are executed in the physical layer and / or the MAC layer, and are connected to the transceivers 130 and 180.
  • the processors 110 and 160 and / or the transceivers 130 and 180 may include application-specific integrated circuits (ASICs), other chipsets, logic circuits, and / or data processors.
  • the memories 120 and 170 may include read-only memory (ROM), random access memory (RAM), flash memory, memory cards, storage media, and / or other storage units.
  • ROM read-only memory
  • RAM random access memory
  • flash memory memory cards, storage media, and / or other storage units.
  • the above-described method may be executed as a module (eg, process, function) that performs the above-described function.
  • the module may be stored in the memory (120, 170), it may be executed by the processor (110, 160).
  • the memory 120 or 170 may be disposed inside or outside the process 110 or 160, and may be connected to the process 110 or 160 by well-known means.
  • the processors 110 and 160 may implement the functions, processes, and / or methods proposed herein.
  • the processors 110 and 160 may perform operations according to the above-described embodiment.
  • the operation of the processor 110 of the transmitting device is specifically as follows.
  • the processor 110 of the transmitting device generates a NDP (Null Data Packet) frame and the NGV frame, transmits the NDP frame to a receiving device through a first band, and transmits the NGV frame after the NDP frame is transmitted. Transmit through the first band.
  • NDP Null Data Packet
  • the operation of the processor 160 of the receiving device is specifically as follows. Whether the processor 160 of the receiving device receives a NDP (Null Data Packet) frame from the transmitting device through a first band, and whether to receive the NGV frame from the transmitting device through the first band based on the NDP frame. Decide.
  • NDP Null Data Packet
  • 26 shows a more detailed wireless device implementing an embodiment of the present invention.
  • the present invention described above for the transmitting device or the receiving device can be applied to this embodiment.
  • the wireless device includes a processor 610, a power management module 611, a battery 612, a display 613, a keypad 614, a subscriber identification module (SIM) card 615, a memory 620, and a transceiver 630 ), One or more antennas 631, a speaker 640, and a microphone 641.
  • a processor 610 a power management module 611, a battery 612, a display 613, a keypad 614, a subscriber identification module (SIM) card 615, a memory 620, and a transceiver 630 ), One or more antennas 631, a speaker 640, and a microphone 641.
  • SIM subscriber identification module
  • the processor 610 can be configured to implement the proposed functions, procedures and / or methods described herein. Layers of the radio interface protocol may be implemented in the processor 610.
  • the processor 610 may include an application-specific integrated circuit (ASIC), other chipsets, logic circuits, and / or data processing devices.
  • the processor may be an application processor (AP).
  • the processor 610 may include at least one of a digital signal processor (DSP), a central processing unit (CPU), a graphics processing unit (GPU), and a modem (modulator and demodulator).
  • DSP digital signal processor
  • CPU central processing unit
  • GPU graphics processing unit
  • modem modulator and demodulator
  • processors 610 are SNAPDRAGONTM series processors manufactured by Qualcomm®, EXYNOSTM series processors manufactured by Samsung®, A series processors manufactured by Apple®, HELIOTM series processors manufactured by MediaTek®, and INTEL®. It may be an ATOMTM series processor manufactured by or a corresponding next-generation processor.
  • the power management module 611 manages power for the processor 610 and / or the transceiver 630.
  • the battery 612 supplies power to the power management module 611.
  • the display 613 outputs the results processed by the processor 610.
  • Keypad 614 receives input to be used by processor 610.
  • the keypad 614 may be displayed on the display 613.
  • the SIM card 615 is an integrated circuit used to securely store an international mobile subscriber identity (IMSI) used to identify and authenticate a subscriber in a mobile phone device such as a mobile phone and a computer, and a key associated therewith. You can also store contact information on many SIM cards.
  • IMSI international mobile subscriber identity
  • the memory 620 is operatively coupled with the processor 610, and stores various information for operating the processor 610.
  • the memory 620 may include read-only memory (ROM), random access memory (RAM), flash memory, a memory card, a storage medium, and / or other storage devices.
  • ROM read-only memory
  • RAM random access memory
  • flash memory a memory card
  • storage medium e.g., hard disk drives
  • / or other storage devices e.g, hard disk drives, a hard disk drives, a hard disk drives, and the like.
  • modules may be stored in memory 620 and executed by processor 610.
  • the memory 620 may be implemented inside the processor 610. Alternatively, the memory 620 may be implemented outside the processor 610 and may be communicatively connected to the processor 610 through various means known in the art.
  • the transceiver 630 is operatively coupled with the processor 610, and transmits and / or receives wireless signals.
  • the transmitter / receiver 630 includes a transmitter and a receiver.
  • the transceiver 630 may include a base band circuit for processing radio frequency signals.
  • the transceiver controls one or more antennas 631 to transmit and / or receive wireless signals.
  • the speaker 640 outputs sound-related results processed by the processor 610.
  • the microphone 641 receives sound-related inputs to be used by the processor 610.
  • the processor 610 In the case of a transmitting device, the processor 610 generates a NDP (Null Data Packet) frame and the NGV frame, transmits the NDP frame to a receiving device through a first band, and after the NDP frame is transmitted, the NGV The frame is transmitted on the first band.
  • NDP Null Data Packet
  • the processor 610 receives the NDP (Null Data Packet) frame from the transmitting device through a first band, and the processor 160 of the receiving device receives the NGV from the transmitting device based on the NDP frame. It is determined whether or not to receive the frame through the first band.
  • NDP Null Data Packet
  • the NDP frame is a frame generated to transmit the NGV frame in the first band. That is, the transmitting device may inform that the NGV frame will be transmitted in the first band (the 20 MHz band, the same band in which the NDP frame is transmitted) by transmitting the NDP frame in the first band (20 MHz band). have.
  • the NDP frame when the NDP frame is transmitted in the first band, it may be transmitted by being duplicated in units of a second band.
  • the first band is a 20 MHz band
  • the second band is a 10 MHz band. That is, the NDP frame is composed of 10 MHz band (or channel) units, and for transmission in the 20 MHz band, the NDP frame transmitted in the 10 MHz band may be copied once and then transmitted.
  • the NDP frame may include L-STF (Legacy-Short Training Field), L-LTF (Legacy-Long Training Field), L-SIG (Legacy-Signal) and NGV-SIG. That is, the L-STF, the L-LTF, the L-SIG, and the NGV-SIG may be copied and transmitted in units of the second band.
  • L-STF Legacy-Short Training Field
  • L-LTF Legacy-Long Training Field
  • L-SIG Legacy-Signal
  • NGV-SIG NGV-SIG
  • the NGV-SIG may include control information for the NGV frame.
  • Control information for the NGV frame includes Modulation and Coding Scheme (MCS) information for the NGV frame, Number of Spatial Time Streams (NSTS) information, encoding information, Transmission Opportunity (TXOP) information, and BSS color (Basic Service Set color) Information, BSS identifier information, identifier information of the receiving device, bandwidth information, channel information, packet length (packet length) information, or signal ranging information may be included.
  • MCS Modulation and Coding Scheme
  • NTS Number of Spatial Time Streams
  • TXOP Transmission Opportunity
  • BSS color Basic Service Set color
  • the receiving device may include a legacy STA supporting an 802.11p system or an NGV STA supporting an 802.11bd system.
  • the NDP frame may further include signaling information on whether the NGV frame is transmitted to the legacy STA or the NGV STA. That is, the legacy STA or the NGV STA can determine whether the NGV frame is transmitted to itself by decoding the NDP frame.
  • the receiving device When the receiving device is a legacy STA supporting an 802.11p system, the receiving device (legacy STA) may confirm that the NGV frame is not transmitted to the receiving device based on the NDP frame. Accordingly, channel access of the legacy STA may not be performed on the first band during the period in which the NGV frame is transmitted. The period in which the NGV frame is transmitted may be determined based on TXOP information or packet length information included in the NDP frame.
  • the receiving device may receive the NGV frame through the first band after the NDP frame is transmitted from the transmitting device. That is, the NGV STA can know that the NGV frame is transmitted based on the NDP frame, and can decode the control information for the NGV frame to check information necessary to receive the NGV frame through the 20 MHz band.
  • the NGV frame may include L-STF, L-LTF, L-SIG, Repeated Legacy (RL) -SIG, NGV-SIG, NGV-STF, NGV-LTF and NGV-Data.
  • L-STF, the L-LTF, the L-SIG, the RL-SIG, and the NGV-SIG may be copied and transmitted in units of the second band.
  • the remaining fields, the NGV-STF, the NGV-LTF, and the NGV-Data may be transmitted through the entire 20 MHz band (first band).
  • the transmitting apparatus may transmit information for transmission of the NGV frame by additionally using four subcarriers (or tones) in the NGV-SIG included in the NDP frame.
  • This embodiment describes a method of using an NDP frame to transmit the NGV frame in the 20 MHz band.
  • the transmitting device may be 20MHz using a CTS frame, a trigger frame (which may be newly defined in NGV by adopting a format defined in 802.11ax), or an L-SIG Length field included in the legacy part of the NGV frame. It may inform the transmission of the NGV frame on the band (or channel).
  • the NGV-SIG is DCM (Dual Carrier Modulation), midamble, doppler (doppler), STBC (Space Time Block Coding), coding (coding), LDPC (Low Density Parity Check) additional symbols, CRC ( Cyclical Redundancy Check) and tail bits may further include information.
  • DCM Double Carrier Modulation
  • doppler doppler
  • STBC Space Time Block Coding
  • coding coding
  • LDPC Low Density Parity Check
  • CRC Cyclical Redundancy Check
  • tail bits may further include information.
  • the information on the bandwidth may include information that the WLAN system supports 10 MHz or 20 MHz band.
  • the MCS information may include information supported by the WLAN system up to 256 QAM.
  • the coding information may include information in which the WLAN system supports Binary Convolutional Codes (BCC) or LDPC.

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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 procédé et un appareil pour la transmission d'une trame de véhicule de nouvelle génération (NGV) dans un système de réseau local sans fil. Plus spécifiquement, un émetteur génère une trame de paquet de données vide (NDP) et une trame NGV. L'émetteur transmet la trame NDP à un récepteur par l'intermédiaire d'une première bande. L'émetteur transmet la trame NGV à travers la première bande après la transmission de la trame NDP. La trame NDP est une trame générée pour transmettre la trame NGV dans la première bande. La trame NDP, lorsqu'elle est transmise dans la première bande, est transmise en étant dupliquée sur une seconde unité de bande. La première bande est une bande de 20 MHz, et la seconde bande est une bande de 10 MHz.
PCT/KR2019/012820 2018-10-01 2019-10-01 Procédé et appareil pour la transmission d'une trame de véhicule de nouvelle génération dans un système de réseau local sans fil WO2020071729A1 (fr)

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Citations (3)

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