WO2016068413A1 - 무선랜 시스템에서 프레임 전송 방법 - Google Patents
무선랜 시스템에서 프레임 전송 방법 Download PDFInfo
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- WO2016068413A1 WO2016068413A1 PCT/KR2015/003516 KR2015003516W WO2016068413A1 WO 2016068413 A1 WO2016068413 A1 WO 2016068413A1 KR 2015003516 W KR2015003516 W KR 2015003516W WO 2016068413 A1 WO2016068413 A1 WO 2016068413A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2602—Signal structure
- H04L27/2603—Signal structure ensuring backward compatibility with legacy system
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2602—Signal structure
- H04L27/26025—Numerology, i.e. varying one or more of symbol duration, subcarrier spacing, Fourier transform size, sampling rate or down-clocking
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
- H04L1/0028—Formatting
- H04L1/0031—Multiple signaling transmission
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2602—Signal structure
- H04L27/261—Details of reference signals
- H04L27/2613—Structure of the reference signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2602—Signal structure
- H04L27/261—Details of reference signals
- H04L27/2613—Structure of the reference signals
- H04L27/26132—Structure of the reference signals using repetition
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2602—Signal structure
- H04L27/261—Details of reference signals
- H04L27/2613—Structure of the reference signals
- H04L27/26134—Pilot insertion in the transmitter chain, e.g. pilot overlapping with data, insertion in time or frequency domain
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0091—Signaling for the administration of the divided path
- H04L5/0094—Indication of how sub-channels of the path are allocated
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
- H04W48/10—Access restriction or access information delivery, e.g. discovery data delivery using broadcasted information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
- H04W48/12—Access restriction or access information delivery, e.g. discovery data delivery using downlink control channel
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access, e.g. scheduled or random access
- H04W74/002—Transmission of channel access control information
- H04W74/004—Transmission of channel access control information in the uplink, i.e. towards network
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access, e.g. scheduled or random access
- H04W74/002—Transmission of channel access control information
- H04W74/006—Transmission of channel access control information in the downlink, i.e. towards the terminal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/04—Large scale networks; Deep hierarchical networks
- H04W84/042—Public Land Mobile systems, e.g. cellular systems
- H04W84/045—Public Land Mobile systems, e.g. cellular systems using private Base Stations, e.g. femto Base Stations, home Node B
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/10—Small scale networks; Flat hierarchical networks
- H04W84/12—WLAN [Wireless Local Area Networks]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/02—Terminal devices
- H04W88/06—Terminal devices adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals
Definitions
- the following description relates to a method for transmitting a frame in a wireless communication system, particularly a high density WLAN system, and a station apparatus for performing the same.
- WLAN wireless local area network
- IEEE 802.11a and b are described in 2.4. Using unlicensed band at GHz or 5 GHz, IEEE 802.11b provides a transmission rate of 11 Mbps, and IEEE 802.11a provides a transmission rate of 54 Mbps.
- IEEE 802.11g applies orthogonal frequency division division multiplexing (OFDM) at 2.4 GHz and provides a transmission rate of 54 Mbps.
- IEEE 802.11 ⁇ applies to multiple input multiple input out (OFDM, MIM0—OFDM), providing a transmission rate of 300 Mbps for four spatial st reams.
- IEEE 802.11n supports channel bandwidths up to 40 MHz, in this case up to 600 Mbps.
- the above-described WLAN standard uses up to 160MHz bandwidth and supports eight spatial streams to support the IEEE 802.11ac standard supporting speeds of up to lGbit / s.
- IEEE 802.11ax standardization uses up to 160MHz bandwidth and supports eight spatial streams to support the IEEE 802.11ac standard supporting speeds of up to lGbit / s.
- the new frame structure includes a frame part for a legacy terminal (for example, 802.11a terminal) and a frame part for a terminal that volunteers IEEE 802.11ax to coexist with a preamble of the terminal for 802.11ax. It is necessary to discuss how to construct and transmit it.
- a legacy terminal for example, 802.11a terminal
- a frame part for a terminal that volunteers IEEE 802.11ax to coexist with a preamble of the terminal for 802.11ax It is necessary to discuss how to construct and transmit it.
- the frame portion for the low 1 type station and the frame portion for the second type station Configure a radio frame for a second type station, wherein the frame portion for the first type station includes a first OFDM symbol for transmission of a signaling field (L-SIG) for a first type station;
- the frame portion for a type station includes at least one second OFDM symbol for signaling field (HE-SIG) transmission for a second type station, wherein the radio frame for the second type station is
- the first and second stations may be second type stations.
- the radio frame for the second type station includes a first section consisting of an OFDM symbol having a first length in a time domain and a second section consisting of an OFDM symbol having a length as long as an integer multiple of the first length. 1 ⁇ 2, wherein the first section includes a frame portion for the first type station and the HE-SIG, and the second section may include a portion except for the HE-SIG in the frame portion for the second type station. Can be.
- the first interval may further include the third OFDM symbol interval.
- the LCS and the lower MCS defined for the first type station may be applied.
- the L-SIG and the HE-SIG may be transmitted by being mapped to different positions in the frequency domain corresponding to the third 0FDM symbol, specifically, any of the L-SIG and the HE-SIG One is mapped to even-numbered tones in the frequency domain of the third 0FDM symbol, and the other of the L-SIG and the HE-SIG is an odd number of the frequency domain of the third 0FDM symbol. Can be mapped to a second tone.
- the L-SIG and the HE-SIG repeatedly transmitted through the third 0FDM symbol are the HE-SIG transmitted through the L-SIG and the second 0FDM symbol transmitted through the first 0FDM symbol. Each piece of information may be repeatedly transmitted.
- the third 0FDM symbol includes the first 0FDM symbol and the second OFDM symbol. It can be located here.
- the HE-SIG may include a first signaling field (HE-SIG A) for a second type station that carries common control information and a second signaling field for a second type station that carries user-specific control information (HE).
- HE-SIG A first signaling field
- HE-SIG B second signaling field for a second type station that carries user-specific control information
- a signal constituting at least one of the SIG A for the second type station and the SIG B for the second type station may be repeatedly implemented N times in units of n bits, and n and N may be two or more natural numbers. have.
- one or more of interleaving or scrambling may be performed on the N repeated signals.
- the second type station may be a station supporting a communication scheme according to the IEEE 802.1 lax standard and the first type station may be a legacy station.
- the station device operating as a first station in a wireless LAN system, the second type comprising a frame portion for the first type station and the frame portion for the second type station
- a processor configured to configure a radio frame for the station;
- the frame portion for the second type station is one or more for signaling field (HE-SIG) transmission for the second type station.
- a second apparatus for configuring the radio frame for the second type station further including one or more third OFDM symbols for repeated transmission of the L-SIG and the HE-SIG. Suggest.
- FIG. 1 is a view showing an example of the configuration of a wireless LAN system.
- FIG. 2 is a view showing another example of the configuration of a wireless LAN system.
- FIG 3 is a view for explaining a frame structure that can be used in a WLAN system.
- FIG. 4 shows a frame format according to the IEEE 802.11ac standard technology.
- FIG. 5 is a diagram illustrating a pream format available in a new standard as one embodiment of the present invention.
- FIG. 6 is a view for explaining a method for constructing a frame according to an embodiment of the present invention.
- FIG. 10 is a view for explaining a method for distinguishing between a HE PPDU and a legacy PPDU according to an embodiment of the present invention.
- 11 and 12 are graphs for explaining the performance as the number of symbols constituting the HE-SIG increases.
- FIG. 13 is a view for explaining a method for increasing the transmission reliability of the L-SIG and HE-SIG according to an embodiment of the present invention.
- 14 to 17 is a view for explaining a method for repeatedly transmitting a portion of the signal of the L-SIG and HE-SIG according to an embodiment of the present invention.
- 18 to 20 are views for explaining a station apparatus according to an aspect of the present invention.
- FIG. 1 is a view showing an example of the configuration of a wireless LAN system.
- the WLAN system includes one or more basic service sets (BSSs).
- BSS is a set of stations (Stations, STAs) that can successfully synchronize and communicate with each other.
- a STA is a logical entity that includes a medium access control (MAC) and a physical layer (Physical Layer) interface for a wireless medium, an access point (AP) and non-AP STA (Non- AP Stat ion).
- the portable terminal operated by the user among the STAs is a non-AP STA, and when referred to simply as an STA, it may also refer to a non-AP STA.
- a non-AP STA may be a terminal, a wireless transmit / receive unit (WTRU), a user equipment (UE), a mobile station (MS), a mobile terminal, or a mobile. It may also be called another name, such as a mobile subscriber unit.
- the AP is an entity that provides access to a distribution system (DS) through a wireless medium to the associated STA (STA) associated with it.
- the AP may be called a centralized controller, a base station (BS), a Node-B, a base transceiver system (BTS), or a site controller.
- BSS can be divided into an infrastructure (SS) BSS and (Independent) BSS (IBSS).
- BBS shown in FIG. 1 is IBSS.
- IBSS means BSS that does not include AP, and because it does not include AP, access to DS is not allowed, thus forming a self-contained network.
- FIG. 2 is a diagram illustrating another example of a configuration of a WLAN system.
- the BSS shown in FIG. 2 is an infrastructure BSS.
- Infrastructure BSS includes one or more STAs and APs.
- communication between non-AP STAs is generally performed via an AP, but when direct link (l ink) is established between non-AP STAs, direct communication between non-AP STAs may be possible.
- a plurality of infrastructure BSSs may be interconnected through a DS.
- Extended service set of multiple BSSs connected through DS may be interconnected through a DS.
- ESS Extended Service Set
- STAs included in the ESS may communicate with each other, and a non-AP STA may move from one BSS to another BSS while communicating seamlessly within the same ESS.
- the DS is a mechanism for connecting a plurality of APs (mechani sm), it does not necessarily need to be a network, there is no limitation on the form if it can provide a predetermined distribution service.
- the DS may be a wireless network such as a mesh network or a physical structure that connects APs to each other.
- the frame structure that can be used in the WLAN system based on the above description.
- FIG. 3 is for explaining a frame structure that can be used in a wireless LAN system One drawing.
- reference numeral 310 of FIG. 3 illustrates a physical layer protocol data unit (PPDU) format for a terminal according to the IEEE 802.11a / g standard
- reference numerals 320 and 330 denote IEEE 802.11 ⁇ .
- the terminal PPDU format according to the standard is shown.
- the terminal supporting the IEEE 802.11 ⁇ scheme uses a frame called " ⁇ -".
- reference numeral 320 denotes a HT-mixed format PPDU of an IEEE 802.11 ⁇ terminal
- 330 denotes a HT-greenf ield format PPE ) U.
- Reference numeral 340 denotes a configuration of a data area in each PPDU, and the data area includes a PSDU (Physical Service Data Unit).
- PSDU Physical Service Data Unit
- FIG. 4 shows a frame format according to the IEEE 802.1 lac standard technology.
- a terminal conforming to the IEEE 802.1 lac standard supports a field denoted by "VHT-".
- each field indicated in FIG. 4 is as follows.
- FIG. 5 is a diagram illustrating a frame format available in a new standard as an embodiment of the present invention.
- L-Part represents a frame part (frame part for a first type terminal) for a legacy terminal
- HE-Part indicates an enhanced standard technology (eg, IEEE 802.11ax).
- a frame portion for the terminal (frame portion for the second type terminal) is shown.
- the frame portion according to the new standard preferably has an integer length longer than the length of the frame portion for legacy terminals in the time domain.
- the legacy lx symbol structure ie, 3.2us
- the HE-preamble and data portion have a frame structure having a 4x symbol (ie, 12.8us) structure. It shows the use.
- L-part is the configuration of the L-STF, L-LTF, L-SIG as it is maintained in the existing WiFi system as described above with respect to Figures 3 and 4 Can follow.
- HE-SIG of the newly defined HE-part may have a field for informing common control information (Co ⁇ on control informat ion) and user specific information (user speci fic informat ion), respectively, FIG. 5 Shows maintaining the lx symbol structure like the L-Part.
- the available frequency tone (F) is increased by four times compared to the existing Wi-Fi, and the number of available tones can be changed.
- the HE preambles HE-STF and HE-LTF
- HE-LTF can also be newly designed to support increased FT and changed number of available tones.
- FIG. 6 is a view for explaining a method for constructing a frame according to an embodiment of the present invention.
- the PPDU format shown in FIG. 6 shows an example in which a PPDU for one STA is transmitted through four channels of 20 MHz in the entire 80 MHz band. However, the PPDU may be transmitted through each of the 20 MHZ channels, and thus, the PPDUs for the different STAs may be transmitted for each of the four channels.
- L-STF, L-LTF and L-SIG may be transmitted through an OFDM symbol generated based on 64 FFT (64 subcarriers) in each 20 MHz channel.
- the HE-part proposes to include two signaling fields.
- the first signaling field (hereinafter 'SIG 1' or 'SIG A') carries common control information
- the second signaling field hereinafter 'SIG 2' or 'SIG B') provides information necessary for data transmission. Assume that you do.
- the HE-SIG A may provide control information that is commonly applied to STAs receiving the corresponding PPDU.
- the HE-SIG A may be transmitted through 2 or 3 OFDM symbols and may include the following information.
- Uplink (UL) 1 Indicating whether a PPDU is destined to an AP (uplink) or indication to an STA (downlink)
- ML indication 1 Indicating whether a PPDU is an SU-MIMO PPDU or an
- Guard Interval (GI) 1 Indicating whether a short GI or a long GI is used
- Allocation 12 Indicating a band or a channel (subchannel index or information subband index) allocated to each STA in a bandwidth in which a PPDU is transmitted
- Transmission power 12 Indicating a transmission power for each channel or each
- each field of Table 2 is exemplary, and the present invention may have a different form of HE-SIG A.
- HE-STF may be used to improve AGC estimation performance in MIM0 transmission
- HE-LTF may be used for MIM0 channel estimation
- the HE-SIG B may include user-specific information required for each STA to receive data (ie, Physical Layer Service Data Unit (PSDU)).
- PSDU Physical Layer Service Data Unit
- the HE-SIG B may include information on the length and MCS level of the corresponding PSDU. This HE-SIG B may be transmitted on 1 or 2 0 FDM symbols.
- L-STF, L-LTF, L-SIG and HE-SIG A may be transmitted in duplicate in each of the 20 MHz channel. That is, although L-STF, L-LTF, L-SIG and HE-SIG A shown in FIG. 6 are all transmitted through four channels, the information to be included may be the same.
- the FFT size per unit frequency may be increased from HE-STF (or HE-SIG A).
- HE-STF or HE-SIG A
- a 256 FFT size can be used for a 20 MHz channel
- a 512 FFT size can be used for a 40 MHz channel
- a 1024 FFT size can be used for an 80 MHz channel.
- unit frequency The number of OFDM subcarriers per cell may also increase because the OFDM subcarrier spacing decreases while the OFDM symbol time increases.
- the Guard Interval (GI) after the HE-STF may be configured to be the same as the GI after the HE-SIG A.
- FIG. 7 is a view for explaining a method for constructing a frame according to another embodiment of the present invention.
- FIG. 7 is the same as FIG. 6 except that HE-SIG B is located immediately after HE-SIG A in comparison with FIG. 6.
- the FFT size per unit frequency can increase after HE-SFT (or HE-SIG B).
- FIG. 8 is a view for explaining a method for constructing a frame according to another embodiment of the present invention.
- FIG. 8 illustrates an example in which HE—SIG B is located immediately after HE-SIG A as shown in FIG. 7.
- 20 MHz channels are allocated to different STAs such as STA 1 to STA 4 to transmit data is illustrated.
- the HE-SIG B assumes that each STA includes information for receiving data, but in the example of FIG. 8, the HE-SIG B is encoded over the entire band. That is, the HE-SIG B may be received by all STAs.
- the FFT size per unit frequency can be increased from HE-SFT (or from HE-SIG B).
- FIG. 9 is a view for explaining a method of constructing a frame according to another embodiment of the present invention.
- FIG. 9 illustrates an example in which the HE-SIG B is located immediately after the HE-SIG A as shown in FIG. 8. However, HE-SIG B also shows an example of separately transmitted for each 20 MHz channel. In the same manner, in the structure of FIG. 7, the HE-SIG B may be changed to be transmitted for each 20 MHz channel.
- L-SFT L-LTF
- L—SIG proposes to transmit 64 FFT size in 20 MHz channel even if the FFT size of other field is increased.
- L-SIG may be transmitted through one OFDM symbol, 10 FDM symbol period is 4um, and GI may be 0.8um.
- HE-SIG A includes the control information required for the HE-STA to receive the HE PPDU, but may be transmitted in a 64 FFT size in the 20 MHz channel to be received not only in the HE STA but also in the legacy STA. . This is for the HE STA to receive not only the HE PPDU but also the HT / VHT PPDUs. To this end, there is a need for a legacy STA and a HE STA to distinguish between the HE PPDU and the HT / VHT PPDU.
- FIG. 10 is a view for explaining a method for distinguishing between a HE PPDU and a legacy PPDU according to an embodiment of the present invention.
- FIG. 10 illustrates a method of classifying PPDUs using phase rotation. That is, the constellation phase of the OFDM symbols after the L-STF, L-LTF, and L-SIG may be rotated and transmitted as shown in order to distinguish PPDUs.
- FIG. 10 shows an example in which the phase of three OFDM symbols after the L-SIG is rotated in the case of the HE PPDU.
- the phases of OFDM symbol 1 and OFDM symbol 2 are not dimmed.
- the phase of the OFDM symbol 3 may be rotated by 90 degrees in the counterclockwise direction and transmitted.
- OFDM symbol 1 and OFDM symbol 2 may be applied to BPSK, and OFDM symbol 3 may be applied to QPSK.
- the HE-SIG (or HE-SIG A and HE-SIG B) may be composed of one or more symbols of 0FDM / A according to the information transmitted.
- the information on the length is common control information of the HE-SIG.
- HE-SIG1 (Or HE-SIG1) and may be transmitted.
- the number of symbols of 0FDM / A allocated to HE-SIG (HE-SIGl) may increase to include such information.
- 11 and 12 are graphs for explaining the performance as the number of symbols constituting the HE-SIG increases.
- FIG. 11 illustrates a change in performance when a CP of 1.6us is used in a UMi-nLoS environment, when HE-SIG is 10FDM symbol, 20FDM symbol, and 30FDM symbol.
- FIG. 12 is a diagram illustrating a performance change according to the change in the number of symbols of the HE-SIG when using a CP of 1.6us in the UMa-nLoS environment.
- the signals of the L-SIG and HE-SIG are carried together in one or more symbols.
- FIG. 13 is a view for explaining a method of increasing the transmission reliability of the L-SIG and HE-SIG according to an embodiment of the present invention.
- the reception performance of L-SIG and HE—SIG for transmitting control information should be good. Therefore, in an embodiment of the present invention, in order to increase the reception performance of the L-SIG and the HE-SIG, the existing L-SIG symbol and the HE-SIG symbol are kept the same as before, respectively, and the signals of the L-SIG and HE-SIG It is suggested that additional transmission be carried with one or more symbols. That is, as shown in Figure 13 for the L-SIG transmission as shown in FIG.
- the first to third OFDM symbols may be one 0FOM symbol or a plurality of 0FDM symbols.
- the signals of the L-SIG and the HE-SIG are repeated in one symbol (the 30th FDM symbol) or only use a specific portion of the symbol (for example, time and frequency). Only a portion of the signal can be repeatedly transmitted. In case of transmitting only a certain part repeatedly, the L-SIG and HE-SIG signals may be mixed and transmitted in one symbol. For example, a signal of L-SIG and HE-SIG may be transmitted together in one symbol.
- the symbols of L-SIG and HE-SIG are repeatedly transmitted, and the repeated symbols may be continuously transmitted to the existing SIG symbols.
- L-SIG and HE-SIG are transmitted through each symbol (the first 0FDM symbol and the second OFDM symbol) using the existing lx symbol structure as shown in FIG.
- the L-SIG and the HE-SIG signals may be transmitted using the third OFDM symbol).
- L-SIG and HE-SIG may be transmitted using MCS 0 (ie, BPSK 1/2) to ensure robustness, L-SIG and HE- by repeatedly sending the symbol as described above You get the same performance as sending a SIG with an MCS lower than MCS0.
- the number of repetitions may be two or more. Meanwhile, the number of repetitions applied to the L-SIG and the HE-SIG may be different.
- the repeated symbol (third OFDM symbol) may be transmitted using the same transmission method as the existing SIG or using a more robust transmission method.
- the L-SIG and HE-SIG in the frequency domain It is suggested to transmit repeatedly.
- even tones of carriers even tones of carriers
- the L-SIG and the HE-SIG may be repeatedly transmitted using tones and odd tones, respectively.
- L-SIG and HE-SIG are also transmitted using each symbol (first and second OFDM symbols) using the existing lx symbol structure, and other symbols (third OFDM symbol) other than the symbol.
- L-SIG and HE-SIG can be carried on the signal.
- the present embodiment it is proposed to transmit different information, that is, signal information of L-SIG and HE-SIG, on odd and even tones of one symbol (third 0FDM symbol), respectively.
- the combination of tone positions through which the L-SIG and HE-SIG are transmitted is as follows. (1) Even Tone-L-SIG, and Odd Tone-HE-SIG, (2) Even Tone-HE-SIG, and Odd Tone ⁇ L-SIG
- the number of third 0FDM symbols used to increase the reliability of L—SIG and HE-SIG may be one or more.
- the third OFDM symbol may be transmitted using the same transmission method as the existing SIG or a more robust transmission method.
- the L-SIG and the HE-SIG may be repeatedly transmitted in a low frequency region and a high frequency region.
- the L-SIG and the HE-SIG are transmitted using respective symbols (first and second 0FDM symbols) using the existing lx symbol structure, and other symbols (third 0FDM symbols) other than these symbols are transmitted.
- the L-SIG and HE-SIG signals can be carried. These symbols are transmitted using a conventional lx symbol structure (64 FFT), wherein the frequency domain of the symbol is divided into two, that is, divided into a low frequency domain and a high frequency domain, each having different information ( For example, L-SIG and HE-SIG signals) may be carried together and transmitted.
- 14 to 17 is a view for explaining a method for repeatedly transmitting a part of the signal of the L-SIG and HE-SIG according to an embodiment of the present invention.
- the 14 to 17 illustrate the existing first and second OFDM symbols for L-SIG and HE-SIG transmission and the third OFDM symbol for repetitive transmission thereof as one OFDM symbol,
- the number of symbols may be one or more.
- the third OFDM symbol is located between the 10th FDM symbol and the 20th FDM symbol.
- the first to third 0FDM symbols may be sequentially located.
- FIG. 14 illustrates a case where the L-SIG / HE-SIG repeated through the third 0FDM symbol is the first half
- FIG. 15 illustrates the third 0FDM symbol.
- the first half of the L-SIG and the second half of the HE-SIG are repeated.
- FIG. 16 is a case where the second half of the L—SIG and the first half of the HE-SIG are repeated through the third 0FDM symbol
- FIG. 17 is the third. The case where the second half of the L-SIG and the HE-SIG is repeated through the 0FDM symbol is illustrated.
- the third 0FDM symbol for repetition may be transmitted using the same GI and / or MCS as the first 0FDM symbol for L-SIG transmission.
- the third 0FDM symbol for repeated transmission may be transmitted using a more robust transmission method, for example, MCS lower than MCS0.
- HE-SIG has been described without distinguishing between HE_SIG A and HE-SIG B.
- the HE-SIG may be classified into an HE-SIG A for transmitting common control information and an HE-SIG B for transmitting user specific information.
- the HE-SIG repeated through the third OFDM symbol together with the L-SIG may be one or more of HE SIG A and HE-SIG B.
- 18 to 20 are diagrams for explaining a station apparatus according to an aspect of the present invention.
- the wireless device 50 of FIG. 18 may correspond to STA1 transmitting a frame or STA2 receiving a frame.
- One or more of each STA1 / STA2 may correspond to an AP.
- STA 50 may include a processor 51, a memory 52, and an RF unit (transmitter / receiver 53).
- the RF unit 53 may include a transmitter for frame transmission and a receiver for frame reception.
- the processor 50 of FIG. 18 may have a configuration for performing an operation as shown in FIGS. 19 and 20.
- the processor 50 may include a channel coder, a miniver, a modulator, and an IFFT model.
- the L—SIG and HE-SIG additionally includes a repeater configuration for repeating transmission. No.
- L-SIG and HE-SIG configures a signal using MCSO (BPSK1 / 2) through the first OFDM symbol and the second OFDM symbol, respectively, before the L-SUG / HE-SIG
- the part or part may be repeated by the repeater and transmitted through the third OFDM symbol.
- Repetition of the signal may repeat the entire signal or repeat bit by bit of the signal modulated by the modulator. For example, if the signal passed through BPSK, 1/2 and the bit interleaver is abcdef as shown in FIG. 19, the signal repeated by the repeater is aabbccddeeff. . It can be configured as. It is assumed here that the repetition coefficient N is 2.
- the signal repetition may be made in units of n bits.
- n may use one of 1, 2, 3, 4, 6, 8, 12, and 24.
- the signal is abcdefgh....
- the repeated signal is abcdabcdefghefgh... It can be configured as
- the repetition for the signal may be two or more. If the repetition factor is 2, the signal is repeated once to ensure the same performance as transmitting the signal to BPSK, 1/4.
- the repetition may be performed immediately after the interleaver, that is, coding is performed by the channel coder.
- Information repeatedly carried out as described above in OFDMA is a BTU (basic tone unit) of a size similar to an allocation size on which an L-SIG / HE-SIG A / B signal is carried to ensure reception performance or the like. It can be transmitted through a combination of BTUs. That is, it can be transmitted by using a combination of small allocation sizes or by using similar allocation sizes.
- HE—SIG A may be transmitted using an lx symbol (64 FFT) and may be transmitted using 52 tones including 4 pilots.
- data / packets may be transmitted using 2 * 26 ton BTUs or 56 ton BTUs.
- the present invention as described above has been described on the assumption that it is applied to the IEEE 802.11-based WLAN system, but is not limited thereto.
- the present invention can be applied in the same manner to various wireless systems.
Abstract
Description
Claims
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US15/515,123 US10051687B2 (en) | 2014-10-27 | 2015-04-08 | Method for transmitting frame in wireless LAN system |
KR1020177006059A KR20170077107A (ko) | 2014-10-27 | 2015-04-08 | 무선랜 시스템에서 프레임 전송 방법 |
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US201462069853P | 2014-10-29 | 2014-10-29 | |
US62/069,853 | 2014-10-29 | ||
US201462072432P | 2014-10-30 | 2014-10-30 | |
US62/072,432 | 2014-10-30 |
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EP3364587B1 (en) * | 2015-10-14 | 2020-03-18 | LG Electronics Inc. | Method for transmitting frame type indication information in wireless lan system and device therefor |
WO2020159163A1 (ko) * | 2019-01-28 | 2020-08-06 | 엘지전자 주식회사 | 무선 통신 시스템에서 패킷을 식별하는 방법 및 장치 |
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US10051687B2 (en) | 2018-08-14 |
KR20170077107A (ko) | 2017-07-05 |
US20170223770A1 (en) | 2017-08-03 |
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