WO2015156520A1 - 데이터 전송 방법 및 이를 이용한 장치 - Google Patents
데이터 전송 방법 및 이를 이용한 장치 Download PDFInfo
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- WO2015156520A1 WO2015156520A1 PCT/KR2015/002871 KR2015002871W WO2015156520A1 WO 2015156520 A1 WO2015156520 A1 WO 2015156520A1 KR 2015002871 W KR2015002871 W KR 2015002871W WO 2015156520 A1 WO2015156520 A1 WO 2015156520A1
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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
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
- H04L5/0051—Allocation of pilot signals, i.e. of signals known to the receiver of dedicated pilots, i.e. pilots destined for a single user or terminal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
- H04B7/0452—Multi-user MIMO systems
-
- 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
-
- 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
- H04L27/2626—Arrangements specific to the transmitter only
- H04L27/2627—Modulators
- H04L27/2634—Inverse fast Fourier transform [IFFT] or inverse discrete Fourier transform [IDFT] modulators in combination with other circuits for modulation
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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
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2668—Details of algorithms
- H04L27/2673—Details of algorithms characterised by synchronisation parameters
- H04L27/2675—Pilot or known symbols
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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
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
- H04L5/005—Allocation of pilot signals, i.e. of signals known to the receiver of common pilots, i.e. pilots destined for multiple users or terminals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/30—Definitions, standards or architectural aspects of layered protocol stacks
- H04L69/32—Architecture of open systems interconnection [OSI] 7-layer type protocol stacks, e.g. the interfaces between the data link level and the physical level
- H04L69/322—Intralayer communication protocols among peer entities or protocol data unit [PDU] definitions
- H04L69/323—Intralayer communication protocols among peer entities or protocol data unit [PDU] definitions in the physical layer [OSI layer 1]
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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]
- H04W84/10—Small scale networks; Flat hierarchical networks
- H04W84/12—WLAN [Wireless Local Area Networks]
Definitions
- the present invention relates to wireless communication, and more particularly, to a data transmission method and apparatus using the same in a WLAN.
- Wi-Fi is a wireless local area network (WLAN) technology that allows wireless devices to connect to the Internet in the 2.4 GHz, 5 GHz, or 60 GHz frequency bands.
- WLANs are based on the Institute of Electrical and Electronics Engineers (IEEE) 802.11 standard.
- the IEEE 802.11n standard supports multiple antennas and provides up to 600 Mbit / s data rates.
- a system supporting IEEE 802.11n is called a high throughput system.
- IEEE 802.11ac primarily operates in the 5GHz band and provides data rates of 1Gbit / s and higher.
- IEEE 802.11ac supports DL MU-MIMO (downlink multi-user multiple input multiple output).
- a system supporting IEEE 802.11ac is called a Very High Throughput (VHT) system.
- VHT Very High Throughput
- IEEE 802.11ax is being developed as the next generation WLAN to cope with higher data rates and higher user loads.
- the scope of IEEE 802.11ax includes: 1) enhancements to the 802.11 physical layer (PHY) and medium access control (MAC) layers, 2) improvement of spectral efficiency and area throughput, and 3) interference sources. May include performance improvement in an environment in which the network exists, a heterogeneous network environment, and an environment in which a high user load exists.
- the existing IEEE 802.11 standard supports orthogonal frequency division multiplexing (OFDM) and uses only one fast Fourier transform (FFT) size in the same bandwidth.
- FFT fast Fourier transform
- next-generation WLANs support orthogonal frequency division multiple access (OFDMA) with multiple user access, and are considering using larger FFT sizes.
- the present invention provides a data transmission method and an apparatus using the same.
- a data transmission method in a WLAN includes a transmitter generating a physical layer protocol data unit (PPDU) and the transmitter transmitting the PPDU to a receiver in a transmission bandwidth.
- the PPDU includes a first part to which a first fast Fourier transform (FFT) size is applied and a second part to which a second FFT size is applied, and the pilot number of the second part is equal to the pilot number of the first part.
- the pilot frequency position of the second part is the same as the pilot frequency position of the first part.
- the second FFT size may be an integer multiple of the first FFT size.
- an apparatus for a WLAN includes a radio frequency (RF) unit for transmitting and receiving a radio signal and a processor coupled to the RF unit.
- the processor generates a physical layer protocol data unit (PPDU) and transmits the PPDU to the receiver through the RF unit in a transmission bandwidth.
- the PPDU includes a first part to which a first fast Fourier transform (FFT) size is applied and a second part to which a second FFT size is applied, and the pilot number of the second part is equal to the pilot number of the first part.
- the pilot frequency position of the second part is the same as the pilot frequency position of the first part.
- FIG. 1 shows a PPDU format according to the prior art.
- FIG. 2 shows an example of a PPDU format for a proposed WLAN.
- FIG. 3 shows another example of a PPDU format for a proposed WLAN.
- FIG. 4 shows another example of a PPDU format for a proposed WLAN.
- FIG. 6 shows an example of a HE PPDU to which different FFT sizes are applied.
- FIG. 7 shows pilot allocation in a 20 MHz transmission according to an embodiment of the present invention.
- 11 shows pilot allocation in an 80 MHz transmission according to another embodiment of the present invention.
- FIG. 13 shows a PPDU transmission method according to an embodiment of the present invention.
- FIG. 14 is a block diagram illustrating a wireless device in which an embodiment of the present invention is implemented.
- WLAN wireless local area network
- IEEE 802.11n a wireless local area network
- HT high throughput
- VHT Very High
- Throughput a wireless local area network
- HEW High Efficiency WLAN
- HE High Efficiency
- HE High Efficiency
- the proposed WLAN system can operate in the band below 6GHz or in the 60GHz band.
- the band below 6 GHz may include at least one of a 2.4 GHz band and a 5 GHz band.
- a station may be called various names such as a wireless device, a mobile station (MS), a network interface device, and a wireless interface device.
- the STA may include a non-AP STA or an AP unless separately distinguishing a function from an access point (AP).
- AP access point
- the STA When described in communication with a STA to an AP, the STA may be interpreted as a non-AP STA.
- the STA may be a non-AP STA or an AP if it is described in STA-to-STA communication or otherwise requires a function of the AP.
- a physical layer protocol data unit is a data block generated in a physical layer according to the IEEE 802.11 standard.
- FIG. 1 shows a PPDU format according to the prior art.
- PPDU supporting IEEE 802.11a / g includes a legacy-short training field (L-STF), a legacy-long training field (L-LTF) and a legacy-signal (L-SIG).
- L-STF may be used for frame detection, automatic gain control (AGC), and the like.
- L-LTF may be used for fine frequency / time synchronization and channel estimation.
- HT PPDU supporting IEEE 802.11n includes HT-SIG, HT-STF, and HT-LTF after L-SIG.
- VHT PPDU supporting IEEE 802.11ac includes VHT-SIGA, VHT-STF, VHT-LTF and VHT-SIGB after L-SIG.
- FIG. 2 shows an example of a PPDU format for a proposed WLAN.
- the PPDU may be transmitted through at least one 20 MHz channel.
- an example in which an 80 MHz band is allocated to one receiving STA is shown.
- Each 20MHz channel may be allocated to different receiving STAs.
- L-STF, L-LTF and L-SIG may be the same as L-STF, L-LTF and L-SIG of the VHT PPDU.
- the L-STF, L-LTF, and L-SIG may be transmitted in orthogonal frequency division multiplexing (OFDM) symbols generated based on 64 fast Fourier transform (FFT) sizes (or 64 subcarriers) in each 20 MHz channel.
- OFDM orthogonal frequency division multiplexing
- the HE-SIGA may include common control information commonly received by an STA receiving a PPDU.
- the HE-SIGA may be transmitted in two or three OFDM symbols.
- the following table illustrates information included in the HE-SIGA.
- the field name and the number of bits are examples only, and not all fields are necessary.
- Table 1 field beat Explanation Bandwidth 2 The bandwidth over which the PPDU is sent. Yes, 20 MHz, 40 MHz, 80 MHz or 160 MHz Group id 6 Indicate the STA or STA group to receive the PPDU.
- Stream information 12 Indicates the number or location of spatial streams to be received by the STA. Alternatively, this indicates the number or location of spatial streams to be received by each STA in the STA group.
- UL (uplink) indication One Indicates whether the PPDU is for an AP (UPLINK) or for an STA (DOWNLINK).
- MU instruction One Indicates whether the SU-MIMO PPDU or MU-MIMO PPDU.
- Guard interval (GI) indication One Indicates whether Short GI or long GI is used.
- HE-STF may be used to improve AGC estimation in MIMO transmission.
- HE-LTF may be used to estimate the MIMO channel. .
- the HE-SIGB may include user specific information required for each STA to receive its own data (ie, physical layer service data unit (PSDU)).
- PSDU physical layer service data unit
- the HE-SIGB may be transmitted in one or two OFDM symbols.
- the HE-SIGB may include information about a length of the PSDU and a modulation and coding scheme (MCS) of the PSDU.
- MCS modulation and coding scheme
- the L-STF, L-LTF, L-SIG, and HE-SIGA may be transmitted redundantly in units of 20 MHz channels. That is, when PPDUs are transmitted on four 20 MHz channels, L-STF, L-LTF, L-STG, and HE-SIGA may be repeatedly transmitted for every 20 MHz channel.
- the FFT size per unit frequency can be further increased. For example, 256 FFT in a 20 MHz channel, 512 FFT in a 40 MHz channel, and 1024 FFT in an 80 MHz channel may be used. Increasing the FFT size reduces the OFDM subcarrier spacing, thereby increasing the number of OFDM subcarriers per unit frequency, but may increase the OFDM symbol time. To increase the efficiency, the GI length after the HE-STF may be set equal to the GI length of the HE-SIGA.
- FIG. 3 shows another example of a PPDU format for a proposed WLAN.
- the FFT size per unit frequency can be further increased.
- FIG. 4 shows another example of a PPDU format for a proposed WLAN.
- HE-SIGB is placed after HE-SIGA. Each 20MHz channel is assigned to different STAs (STA1, STA2, STA3, STA4).
- the HE-SIGB contains information specific to each STA, but is encoded over the entire band. That is, the HE-SIGB can be received by all STAs. From HE-STF (or after HE-SIGB), the FFT size per unit frequency can be further increased.
- legacy STAs supporting legacy IEEE 802.11a / g / n / ac cannot decode the corresponding PPDU.
- the L-STF, L-LTF, and L-SIG are transmitted through a 64 FFT on a 20 MHz channel so that the existing STA can be received.
- L-SIG occupies one OFDM symbol, one OFDM symbol time is 4us, and GI has 0.8us.
- the HE-SIGA includes information necessary for the HE STA to decode the HE PPDU, but may be transmitted through a 64 FFT in a 20 MHz channel so that both the legacy STA and the HE STA can be received. This is for the HE STA to receive not only the HE PPDU but also the existing HT / VHT PPDU. At this time, it is necessary for the legacy STA and the HE STA to distinguish between the HE PPDU and the HT / VHT PPDU.
- the phase of constellation for OFDM symbols transmitted after L-STF, L-LTF, and L-SIG is used.
- OFDM symbol # 1 is the first OFDM symbol after L-SIG
- OFDM symbol # 2 is the OFDM symbol following OFDM symbol # 1
- OFDM symbol # 3 is the OFDM symbol following OFDM symbol # 2.
- the constellation phases used for the 1st OFDM symbol and the 2nd OFDM symbol are the same.
- Binary phase shift keying (BPSK) is used for both the 1st OFDM symbol and the 2nd OFDM symbol.
- the phases used in the OFDM symbol # 1 and the OFDM symbol # 2 are the same, and are rotated 90 degrees counterclockwise.
- a modulation method having a 90 degree rotated constellation is called quadrature binary phase shift keying (QBPSK).
- the phase in OFDM symbol # 1 is not rotated, but the phase in OFDM symbol # 2 is rotated 90 degrees counterclockwise in the same way as the HT PPDU. Since the VHT-SIGA is transmitted after the L-SIG and the VHT-SIGA is transmitted in 2 OFDM symbols, OFDM symbol # 1 and OFDM symbol # 2 are used for transmission of the VHT-SIGA.
- the HE-PPDU may use the phase of three OFDM symbols transmitted after the L-SIG.
- the phases of OFDM symbol # 1 and OFDM symbol # 2 are not rotated, but the phase of OFDM symbol # 3 is rotated 90 degrees counterclockwise.
- OFDM symbols # 1 and # 2 use BPSK modulation, and OFDM symbols # 3 use QBPSK modulation.
- the HE-SIGA is transmitted after the L-SIG and the HE-SIGA is transmitted in 3 OFDM symbols, all of the OFDM symbols # 1 / # 2 / # 3 may be used for transmission of the HE-SIGA.
- the pilot subcarriers are configured in the following manner.
- pilot tones may be inserted at subcarrier index k ⁇ ⁇ -21, -7, 7, 21 ⁇ in a 20MHz transmission.
- P n k representing the pilot mapping of the k th subcarrier in the n th symbol may be represented by the following equation.
- pilot parameter ⁇ (1) 1, m may be defined as shown in the following table.
- pilot tones may be inserted at subcarrier index k ⁇ ⁇ -53, -25, -11, 11, 25, 53 ⁇ .
- P n k representing the pilot mapping of the k th subcarrier in the n th symbol may be represented by the following equation.
- (1) 1, m may be defined as shown in the following table.
- pilot tones can be inserted at subcarrier indices k ⁇ ⁇ -103, -75, -39, -11, 11, 39, 75, 103 ⁇ .
- P n k representing the pilot mapping of the k th subcarrier in the n th symbol may be represented by the following equation.
- n may be defined as shown in the following table.
- an 80 MHz pilot mapping is duplicated into two 80 MHz subchannels for a 160 MHz transmission.
- 16 pilot tones have subcarrier indices k ⁇ ⁇ -231, -203, -167, -139, -117, -89, -53, -25, 25, 53, 89, 117, 139, 167, 203, 231 ⁇ Can be inserted.
- P n k representing the pilot mapping of the k th subcarrier in the n th symbol may be represented by the following equation.
- the pilot parameter ⁇ m for the 160 MHz transmission can be defined as shown in Table 4, the same as the 80 MHz transmission.
- the same FFT size is applied to the existing 802.11n and 802.11ac based PPDU. For example, 64 FFT is applied to a 20 MHz transmission.
- the HE PPDU is divided into two parts, the first part may apply the FFT size that the legacy STA can receive, and the second part may apply the FFT size that only the HE STA can receive.
- the first part may be called a legacy part, and the second part may be called an HE part.
- the second part may be after the L-SIG, after the HE-STF, or after the HE-SIGA.
- FIG. 6 shows an example of a HE PPDU to which different FFT sizes are applied.
- an FFT of an integer multiple of the FFT size of the first part may be applied. For example, 64 FFT is applied to the first part in a 20 MHz transmission, but a FFT of 2 times (128 FFT) or 4 times (256 FFT) may be applied to the second part.
- Increasing the FFT size reduces the OFDM subcarrier spacing, thereby increasing the number of OFDM subcarriers per unit frequency.
- the subcarrier spacing is 312.5 kHz in the first part and 156.25 kHz in the second part.
- CP size increases from 0.8 us (micro second) to 1.6 us.
- pilots inserted into the PPDU may not need to be allocated as many as the increased FFT size. This is because the FFT is applied with increased size, but the bandwidth used for channel measurement and tracking is the same for both the first part and the second part.
- the design is maintained while maximizing the pilot allocation according to the existing system, the complexity issue due to the introduction of the new system may not be greatly burdened.
- pilot allocation in the second part in 20MHz, 40MHz, 80MHz, 180MHz bandwidth is proposed.
- the pilot number of the second part may be equal to the pilot number of the first part.
- the pilot frequency position of the second part may be the same as the pilot frequency position of the first part. The frequency positions are the same, but the subcarrier indices are different due to different FFT sizes.
- the number of tones allocated to the DC subcarrier and the number of unused tones for interference prevention are merely examples, and may be arbitrary values. have.
- FIG. 7 shows pilot allocation in a 20 MHz transmission according to an embodiment of the present invention.
- the pilot allocation of Equation 1 is used in the same manner as the existing 20 MHz transmission.
- Four pilot tones may be inserted at subcarrier index k ⁇ ⁇ -21, -7, 7, 21 ⁇ .
- the pilot tone count remains at 4 at 64 FFT (two positive frequency indices and two negative frequency indices).
- the frequency position to be used by the STA for channel measurement is maintained.
- the pilot subcarrier extraction does not cause additional complexity, and even if a new system is introduced, the existing implementation module can be utilized to the maximum.
- the scaling factor F 4.
- Scaling factors F 2 and 4 are examples only, and F may be an integer greater than one.
- the pilot sequence and pilot assignment in the 20 MHz transmission can be represented as follows.
- the pilot sequence for the i STS th spatial stream and the n th symbol is as follows.
- N STS is the number of spatial streams
- the original character '+' represents a modulo operation
- P n k representing the pilot mapping of the k th subcarrier in the n th symbol may be represented by the following equation.
- the pilot parameter ⁇ (1) 1, m may be defined as shown in Table 2 like the existing 20 MHz transmission.
- the pilot sequence for the i STS th spatial stream and the n th symbol is as follows.
- P n k representing the pilot mapping of the k th subcarrier in the n th symbol may be represented by the following equation.
- the pilot parameter ⁇ (1) 1, m may be defined as shown in Table 2 like the existing 20 MHz transmission.
- the pilot allocation of Equation 2 is used in the same manner as the existing 40 MHz transmission.
- Six pilot tones may be inserted at subcarrier index k ⁇ ⁇ -53, -25, -11, 11, 25, 53 ⁇ .
- the pilot tone count remains at 6 at 128 FFT (three positive frequency indices and three negative frequency indices).
- the pilot sequence and pilot assignment in the 40 MHz transmission can be represented as follows.
- the pilot sequence for the i STS th spatial stream and the n th symbol is as follows.
- N STS represents the number of spatial streams.
- P n k representing the pilot mapping of the k th subcarrier in the n th symbol may be represented by the following equation.
- the pilot parameter ⁇ (1) 1, m may be defined as shown in Table 3 like the existing 40 MHz transmission.
- the pilot sequence for the i STS th spatial stream and the n th symbol is as follows.
- P n k representing the pilot mapping of the k th subcarrier in the n th symbol may be represented by the following equation.
- the pilot parameter ⁇ (1) 1, m may be defined as shown in Table 3 like the existing 40 MHz transmission.
- 11 shows pilot allocation in an 80 MHz transmission according to another embodiment of the present invention.
- the first part uses the pilot assignment of Equation 3 in the same manner as the existing 80 MHz transmission.
- Eight pilot tones may be inserted at subcarrier index k ⁇ ⁇ -103, -75, -39, -11, 11, 39, 75, 103 ⁇ .
- the pilot tone count remains at 8 at 256 FFTs (four positive and four negative frequency indices).
- the scaling factor F 4.
- Pilot sequence and pilot assignment in the 80MHz transmission can be represented as follows.
- P n k representing the pilot mapping of the k th subcarrier in the n th symbol may be represented by the following equation.
- the pilot parameter ⁇ m may be defined as shown in Table 4 as in the existing 80 MHz transmission.
- P n k representing the pilot mapping of the k th subcarrier in the n th symbol may be represented by the following equation.
- the pilot parameter ⁇ m may be defined as shown in Table 4 as in the existing 80 MHz transmission.
- the 512 FFT is applied to the first part.
- an 80 MHz pilot mapping is duplicated into two 80 MHz subchannels for a 160 MHz transmission.
- 16 pilot tones have subcarrier indices k ⁇ ⁇ -231, -203, -167, -139, -117, -89, -53, -25, 25, 53, 89, 117, 139, 167, 203, 231 ⁇ Can be inserted.
- the pilot sequence and the pilot assignment in the 160MHz transmission can be represented as follows.
- P n k representing the pilot mapping of the k th subcarrier in the n th symbol may be represented by the following equation.
- pilot parameter ⁇ m may be defined as shown in Table 4.
- P n k representing the pilot mapping of the k th subcarrier in the n th symbol may be represented by the following equation.
- pilot parameter ⁇ m may be defined as shown in Table 4.
- FIG. 13 shows a PPDU transmission method according to an embodiment of the present invention. This method may be performed by a transmitter (STA or AP).
- STA transmitter
- AP AP
- step S1310 the transmitter generates a PPDU.
- operation S1320 the transmitter transmits the PPDU to the receiver in the transmission bandwidth.
- the transmission bandwidth may be an integer multiple of 20 MHz.
- the PPDU may be one of the PPDU formats of FIGS. 2 to 4, but is not limited thereto.
- the PPDU may include a first part to which the first FFT size is applied and a second part to which the second FFT size is applied.
- the number of pilots of the second part may be equal to the number of pilots of the first part.
- the pilot frequency position of the second part may be the same as the pilot frequency position of the first part.
- the pilot allocation in the first part and the second part may be according to the embodiment of FIGS. 7 to 12.
- FIG. 14 is a block diagram illustrating a wireless device in which an embodiment of the present invention is implemented.
- the wireless device 50 may include an STA in the above-described embodiment.
- the wireless device 50 may include a transmitter in the embodiment of FIG. 13.
- the wireless device 50 includes a processor 51, a memory 52, and an RF unit 53.
- the wireless device may be an AP or a non-AP STA in the above-described embodiment.
- the RF unit 53 is connected to the processor 51 and transmits and / or receives a radio signal.
- the processor 51 implements the proposed functions, processes and / or methods. In the above-described embodiment, the operation of the STA or the transmitter may be implemented by the processor 51.
- the memory 52 may be connected to the processor 51 to store instructions for implementing an operation of the processor 51.
- the processor may include application-specific integrated circuits (ASICs), other chipsets, logic circuits, and / or data processing devices.
- the memory may include read-only memory (ROM), random access memory (RAM), flash memory, memory card, storage medium and / or other storage device.
- the RF unit may include a baseband circuit for processing a radio signal.
- the above-described technique may be implemented as a module (process, function, etc.) for performing the above-described function.
- the module may be stored in memory and executed by a processor.
- the memory may be internal or external to the processor and may be coupled to the processor by various well known means.
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Abstract
Description
| 필드 | 비트 | 설명 |
| 대역폭 | 2 | PPDU가 전송되는 대역폭. 예, 20MHz, 40MHz, 80MHz 또는 160MHz |
| 그룹 ID | 6 | PPDU를 수신할 STA 또는 STA 그룹을 지시함. |
| 스트림 정보 | 12 | STA이 수신할 공간 스트림(spatial stream)의 개수 또는 위치를 나타냄. 또는, STA 그룹내 각 STA이 수신할 공간 스트림의 개수 또는 위치를 나타냄. |
| UL(uplink) 지시 | 1 | PPDU가 AP를 위한 것인지(UPLINK) 또는 STA을 위한 것인지(DOWNLINK)를 나타냄. |
| MU 지시 | 1 | SU-MIMO PPDU 인지 MU-MIMO PPDU 여부를 나타냄. |
| GI(Guard interval) 지시 | 1 | Short GI 또는 long GI가 사용되는지 여부를 나타냄. |
| 할당 정보 | 12 | PPDU가 전송되는 대역폭에서 각 STA에게 할당되는 대역 또는 채널(서브채널 인덱스 또는 서브밴드 인덱스) |
| 전송 파워 | 12 | 할당되는 채널 별 전송 파워 |
Claims (12)
- 무선랜에서 데이터 전송 방법에 있어서,전송기가 PPDU(Physical layer Protocol Data Unit)를 생성하고,상기 전송기가 전송 대역폭에서 상기 PPDU를 수신기로 전송하는 것을 포함하되,상기 PPDU는 제1 FFT(fast Fourier transform) 크기가 적용되는 제1 파트와 제2 FFT 크기가 적용되는 제2 파트를 포함하고,상기 제2 파트의 파일럿 수는 상기 제1 파트의 파일럿 수와 동일하고,상기 제2 파트의 파일럿 주파수 위치(frequency position)는 상기 제1 파트의 파일럿 주파수 위치와 동일한 데이터 전송 방법.
- 제1항에 있어서,상기 제2 FFT 크기는 상기 제1 FFT 크기의 정수배인 것을 특징으로 하는 데이터 전송 방법.
- 제2항에 있어서,상기 제2 FFT 크기는 상기 제1 FFT 크기의 2배 또는 4배인 것을 특징으로 하는 데이터 전송 방법.
- 제2항에 있어서,상기 제2 FFT 크기가 상기 정수배로 증가함에 따라, 상기 제2 파트의 파일럿 서브캐리어 인덱스는 상기 정수배 만큼씩 증가하는 데이터 전송 방법.
- 제2항에 있어서,상기 전송 대역폭이 20 MHz 일 때, 상기 제2 FFT 크기는 256 이고, 상기 제1 파트의 파일럿 수는 4개인 것을 특징으로 하는 데이터 전송 방법.
- 제2항에 있어서,상기 전송 대역폭이 40 MHz 일 때, 상기 제2 FFT 크기는 512 이고, 상기 제1 파트의 파일럿 수는 6개인 것을 특징으로 하는 데이터 전송 방법.
- 제2항에 있어서,상기 전송 대역폭이 80 MHz 일 때, 상기 제2 FFT 크기는 1024 이고, 상기 제1 파트의 파일럿 수는 8개인 것을 특징으로 하는 데이터 전송 방법.
- 제2항에 있어서,상기 전송 대역폭이 160 MHz 일 때, 상기 제2 FFT 크기는 2048 이고, 상기 제1 파트의 파일럿 수는 16개인 것을 특징으로 하는 데이터 전송 방법.
- 무선랜을 위한 장치에 있어서,무선신호를 송신 및 수신하는 RF(radio frequency)부;와상기 RF부에 연결되는 프로세서를 포함하되, 상기 프로세서는PPDU(Physical layer Protocol Data Unit)를 생성하고,전송 대역폭에서 상기 PPDU를 상기 RF부를 통해 수신기로 전송하되,상기 PPDU는 제1 FFT(fast Fourier transform) 크기가 적용되는 제1 파트와 제2 FFT 크기가 적용되는 제2 파트를 포함하고,상기 제2 파트의 파일럿 수는 상기 제1 파트의 파일럿 수와 동일하고,상기 제2 파트의 파일럿 주파수 위치(frequency position)는 상기 제1 파트의 파일럿 주파수 위치와 동일한 장치.
- 제9항에 있어서,상기 제2 FFT 크기는 상기 제1 FFT 크기의 정수배인 것을 특징으로 하는 장치.
- 제10항에 있어서,상기 제2 FFT 크기는 상기 제1 FFT 크기의 2배 또는 4배인 것을 특징으로 하는 장치.
- 제10항에 있어서,상기 제2 FFT 크기가 상기 정수배로 증가함에 따라, 상기 제2 파트의 파일럿 서브캐리어 인덱스는 상기 정수배 만큼씩 증가하는 것을 특징으로 하는 장치.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020167028099A KR101966899B1 (ko) | 2014-04-09 | 2015-03-24 | 데이터 전송 방법 및 이를 이용한 장치 |
| US15/302,924 US10097250B2 (en) | 2014-04-09 | 2015-03-24 | Method for transmitting a PPDU in a transmission bandwidth and device for same |
| EP15776910.0A EP3131249B1 (en) | 2014-04-09 | 2015-03-24 | Method for transmitting mixed ppdu in he-wlan and device using same |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US201461977103P | 2014-04-09 | 2014-04-09 | |
| US201461977599P | 2014-04-09 | 2014-04-09 | |
| US61/977,103 | 2014-04-09 | ||
| US61/977,599 | 2014-04-09 |
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| WO2015156520A1 true WO2015156520A1 (ko) | 2015-10-15 |
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| PCT/KR2015/002871 Ceased WO2015156520A1 (ko) | 2014-04-09 | 2015-03-24 | 데이터 전송 방법 및 이를 이용한 장치 |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US10097250B2 (ko) |
| EP (1) | EP3131249B1 (ko) |
| KR (1) | KR101966899B1 (ko) |
| WO (1) | WO2015156520A1 (ko) |
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| US10158516B2 (en) * | 2014-04-15 | 2018-12-18 | Lg Electronics Inc. | Method and apparatus for transmitting data block |
| US11290211B2 (en) | 2016-03-09 | 2022-03-29 | Intel Corporation | Apparatus, system and method of communicating a transmission according to a space-time encoding scheme |
| US20170265217A1 (en) * | 2016-03-09 | 2017-09-14 | Intel Corporation | Apparatus, system and method of communicating pilot signals according to a diversity scheme |
| CN111935814B (zh) * | 2016-07-18 | 2021-11-16 | 中兴通讯股份有限公司 | 同步信号的发送、接收方法及装置、传输系统 |
| CN109565362B (zh) * | 2017-03-10 | 2021-09-14 | Lg 电子株式会社 | 无线lan系统中发送和接收信号的方法及装置 |
| CN108810957B (zh) * | 2017-05-05 | 2020-12-15 | 华为技术有限公司 | 监测信息的方法、终端和网络设备 |
| WO2019240441A1 (ko) * | 2018-06-15 | 2019-12-19 | 엘지전자 주식회사 | 무선랜 시스템에서 ppdu를 송신하는 방법 및 장치 |
| CN111901081A (zh) * | 2020-01-16 | 2020-11-06 | 中兴通讯股份有限公司 | 数据传输方法、装置、第一通信节点和第二通信节点 |
| US20250247279A1 (en) * | 2022-04-14 | 2025-07-31 | Lg Electronics Inc. | Method and device for transmission or reception based on tone allocation for new numerology in wireless lan system |
| CN117134871A (zh) * | 2022-05-19 | 2023-11-28 | 华为技术有限公司 | 基于物理层协议数据单元的通信方法及装置 |
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- 2015-03-24 WO PCT/KR2015/002871 patent/WO2015156520A1/ko not_active Ceased
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Also Published As
| Publication number | Publication date |
|---|---|
| US20170041050A1 (en) | 2017-02-09 |
| KR101966899B1 (ko) | 2019-04-08 |
| KR20160138106A (ko) | 2016-12-02 |
| EP3131249B1 (en) | 2019-03-06 |
| US10097250B2 (en) | 2018-10-09 |
| EP3131249A4 (en) | 2017-11-22 |
| EP3131249A1 (en) | 2017-02-15 |
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