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WO2016018026A1 - Procédé selon lequel un sta reçoit un signal dans un système de réseau local sans fil - Google Patents

Procédé selon lequel un sta reçoit un signal dans un système de réseau local sans fil Download PDF

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Publication number
WO2016018026A1
WO2016018026A1 PCT/KR2015/007829 KR2015007829W WO2016018026A1 WO 2016018026 A1 WO2016018026 A1 WO 2016018026A1 KR 2015007829 W KR2015007829 W KR 2015007829W WO 2016018026 A1 WO2016018026 A1 WO 2016018026A1
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WIPO (PCT)
Prior art keywords
sta
ppdu
mhz
allocated
bandwidth
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Ceased
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PCT/KR2015/007829
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English (en)
Korean (ko)
Inventor
이욱봉
류기선
조한규
최진수
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LG Electronics Inc
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LG Electronics Inc
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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
    • 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 following description relates to a method for receiving a signal from a SAT in a wireless communication 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 multiplexing (OFDM) at 2.4 GHz to provide a transmission rate of 54 Mbps.
  • IEEE 802.11n applies multiple input multiple output OFDM (MIMO-OFDM) to provide a transmission rate of 300 Mbps for four spatial streams. IEEE 802.11n supports channel bandwidths up to 40 MHz, in this case providing a transmission rate of 600 Mbps.
  • the WLAN standard uses a maximum of 160MHz bandwidth, supports eight spatial streams, and supports IEEE 802.11ax standard through an IEEE 802.11ac standard supporting a speed of up to 1Gbit / s.
  • the present invention relates to which numerology the STA will receive when a new PPDU is used.
  • a method for receiving a signal by a STA in a wireless communication system comprising: receiving a PPDU from an AP; And decoding the PPDU, wherein the downlink bandwidth through which the PPDU is transmitted includes resource units for a plurality of STAs that can be multiplexed with the STA, and the STA performs the downlink bandwidth when performing the decoding.
  • the STA is a signal reception method of the STA, assuming that the DC subcarrier also exists in the center portion of the bandwidth allocated to the STA.
  • an STA apparatus in a wireless communication system comprising: a receiving module; And a processor, wherein the processor receives a PPDU from an AP, decodes the PPDU, and a downlink bandwidth through which the PPDU is transmitted includes resource units for a plurality of STAs that can be multiplexed with the STA;
  • the STA is a STA device that assumes that a DC subcarrier exists in a center portion of the bandwidth allocated to the STA, in addition to the center of the downlink bandwidth.
  • Embodiments of the invention may include all or part of the following.
  • Timing-related constants used by the STA when performing the decoding may vary according to bandwidth allocated to the STA.
  • the timing-associated constant may include the number of data subcarriers, the number of pilot subcarriers, and the total number of subcarriers.
  • the number of data subcarriers of the resource unit may be 52.
  • the number of pilot subcarriers may be four.
  • the bandwidth allocated to the STA may be a multiple of the resource unit.
  • STAs can efficiently use a new PPDU while reducing complexity.
  • FIG. 1 is a diagram illustrating an example of a configuration of a WLAN system.
  • FIG. 2 is a diagram illustrating another example of a configuration of a WLAN 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.
  • 5 is a diagram for explaining a frame time interval.
  • 6 to 8 are diagrams for explaining an embodiment of the present invention.
  • FIG. 9 is a diagram illustrating a configuration of a transmitting and receiving device.
  • the following description relates to a method for transmitting a frame in a WLAN system and a station apparatus for performing the same.
  • a WLAN system to which the present invention is applied will be described in detail.
  • FIG. 1 is a diagram illustrating an example of a configuration of a WLAN system.
  • the WLAN system includes one or more basic service sets (BSSs).
  • BSS is a set of stations (STAs) that can successfully synchronize and communicate with each other.
  • STA is a logical entity that includes a medium access control (MAC) and a physical layer interface to a wireless medium, and includes an access point (AP) STA and a non-AP STA (Non-AP Station). It includes. Simply referred to as an AP refers to an AP STA, and also referred to as an AP may refer to a non-AP STA.
  • a non-AP STA is a terminal, a wireless transmit / receive unit (WTRU), a user equipment (UE), a mobile station (MS), a mobile terminal, or a mobile subscriber. It may also be called another name such as a mobile subscriber unit.
  • the AP is an entity that provides an associated station (STA) coupled to the AP to access a distribution system (DS) through a wireless medium.
  • STA station
  • DS distribution system
  • the AP may be called a centralized controller, a base station (BS), a Node-B, a base transceiver system (BTS), or a site controller.
  • BS base station
  • BTS base transceiver system
  • BSS can be divided into infrastructure BSS and Independent BSS (IBSS).
  • IBSS Independent BSS
  • the BBS shown in FIG. 1 is an IBSS.
  • the IBSS means a BSS that does not include an AP. Since the IBSS does not include an AP, access to the DS is not allowed, thereby 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 performed via an AP.
  • AP access point
  • a plurality of infrastructure BSSs may be interconnected through a DS.
  • a plurality of BSSs connected through a DS is called an extended service set (ESS).
  • STAs included in the ESS may communicate with each other, and a non-AP STA may move from one BSS to another BSS while seamlessly communicating within the same ESS.
  • the DS is a mechanism for connecting a plurality of APs.
  • the DS is not necessarily a network, and there is no limitation on the form if it can provide a predetermined distribution service.
  • the DS may be a wireless network such as a mesh network or a physical structure that connects APs to each other.
  • FIG 3 is a view for explaining a frame structure that can be used in a WLAN system.
  • 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 refer to an IEEE 802.11n standard
  • a PPDU format for a terminal is shown.
  • a terminal supporting the IEEE 802.11n scheme uses a frame called HT-.
  • reference numeral 320 denotes a HT-mixed format PPDU of an IEEE 802.11n terminal
  • 330 denotes a HT-greenfield format PPDU.
  • 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 802.11ac standard technology.
  • a terminal conforming to the IEEE 802.11ac standard supports a field denoted as VHT-.
  • each field shown in FIG. 4 is as follows.
  • IFS Inter-Frame Space
  • the time interval between two frames may be defined as an inter-frame space (IFS).
  • IFS inter-frame space
  • the STA may determine whether the channel is used during IFS through carrier sensing.
  • the DCF MAC layer defines four IFSs, whereby the priority to occupy the wireless medium can be determined.
  • IFS may be set to a specific value according to the physical layer regardless of the bit rate of the STA. Types of IFS are the same as SIFS (Short IFS), PIFS (PCF IFS), DIFS (DCF IFS), and EIFS (Extended IFS). SIFS (Short IFS) is used when transmitting an RTS / CTS or ACK frame and may have the highest priority. PIFS (PCF IFS) may be used for PCF frame transmission, and DIFS (DCF IFS) may be used for DCF frame transmission. Extended IFS (EIFS) is used only when a frame transmission error occurs and does not have a fixed interval.
  • SIFS Short IFS
  • PCF IFS PCF IFS
  • DIFS DIFS
  • EIFS Extended IFS
  • each IFS is defined as a time gap on the medium, and related attributes are provided by the physical layer as shown in FIG. 5 below.
  • FIG. 5 is a diagram illustrating the relationship of IFS.
  • the end of the last symbol of the PPDU indicates the end of transmission
  • the first symbol of the preamble of the next PPDU indicates the start of transmission.
  • All MAC timings may be determined with reference to the PHY-TXEND.confirm primitive, PHYTXSTART.confirm primitive, PHY-RXSTART.indication primitive and PHY-RXEND.indication primitive.
  • the SIFS time aSIFSTime and the slot time aSlotTime may be determined for each physical layer.
  • the SIFS time has a fixed value, and the slot time may change dynamically according to a change in the air delay time (aAirPropagationTime).
  • SIFS, PIFS, and DIFS may be defined as Equations 1 to 3, respectively, and the values in parentheses in each equation are generally used. However, this value may vary by terminal and / or by location.
  • HE-PPDU High Efficiency PLCP protocol data unit
  • the example of FIG. 6A includes a 12.8? S HE-SIGA field, and may include a 1 symbol HE-STF field, a HE-LTF field, and a 1 symbol HE-SIGB field. From the beginning of the HE-STF, 256, 512, 1024, and 2048 FFTs can be applied to 20 MHz, 40 MHz, 80 MHz, and 160 MHz HE PPDU formats, respectively.
  • the PPDU format of FIG. 6 (b) may include a 1 symbol HE-STF field, a 1 symbol HE-SIG field, and a HE-LTF field. From the beginning of the HE-STF, 256, 512, 1024, and 2048 FFTs can be applied to 20 MHz, 40 MHz, 80 MHz, and 160 MHz HE PPDU formats, respectively.
  • the PPDU format of FIG. 6C may include a 1 symbol HE-STF field and a 1 symbol HE-SIG field. From the beginning of the HE-STF, 256, 512, 1024, and 2048 FFTs can be applied to the 20 MHz, 40 MHz, 80 MHz, and 160 MHz HE PPDU formats, respectively.
  • the PPDU format as in the above example may be for an FFT size four times larger in each bandwidth than the existing IEEE 802.11 OFDM system (IEEE 802.11a, 802.11n, 802.11ac).
  • the SAT may receive such a PPDU from the AP and decode the PPDU.
  • the downlink bandwidth through which the PPDU is transmitted may include a resource unit (701 of FIG. 7) for a plurality of STAs that may be multiplexed with the STA.
  • the STA may assume that in addition to the center of the downlink bandwidth, the DC subcarrier exists in the center portion of the bandwidth allocated to the STA when decoding is performed. That is, the position where the DC subcarrier is assumed to exist depends on the bandwidth allocated to the STA.
  • the bandwidth allocated to the STA may be a multiple of a resource unit.
  • Timing-related constants used by the STA when performing the decoding may vary depending on the bandwidth allocated to the STA.
  • the timing-associated constant may include the number of data subcarriers, the number of pilot subcarriers, and the total number of subcarriers.
  • Timing-related constants may be used as defined in the following Table 2 (Timing-related constants of IEEE 802.11ah) or Table 3 (Timing-related constants of IEEE 802.11ac).
  • the number of data subcarriers in a resource unit may be 52 and the number of pilots may be four.
  • the STA data and the channel estimation LTF may be transmitted according to the transmission bandwidth of each allocated STA.
  • 20 MHz may be divided into four subblocks.
  • 20 MHz (N_SD 52) of VHT for one continuous
  • 40 MHz (N_SD 108) for VHT for two consecutive
  • 80 MHz (N_SD 234) for VHT for four consecutive STAs.
  • allocation numbers when allocated non-contiguous sub-blocks, or contiguous sub-blocks rather than two or four), group them into two consecutive contiguous sub-blocks and four sub-blocks.
  • the interleaver may be performed in-between, and a segment parser may be placed between subblocks in a manner similar to that of 160 MHz or 80 + 80 MHz transmission in VHT, thereby obtaining maximum diversity gain in the frequency axis.
  • the same method can be used at 40 MHz / 80 MHz / 80 + 80 MHz / 160 MHz.
  • the maximum number of allocated STAs may be fixed to 4 or 8, and at this time, the STAs may be allocated as contiguous resources or a set of subbands grouped by 2 or 4 may be specified. Patterns can be assigned (using permutation or interleaving techniques).
  • uplink In the case of uplink, it is always allocated in multiples of 20 MHz per STA (i.e. 20 MHz, 40 MHz, 80 MHz, 80 + 80 MHz, 160 MHz), i.e. 4, 8, 16, 16 + 16 consecutive subbands in the example above. 32 can be allocated, and at this time, a specific pattern of mixing the above-mentioned sets of 2 or 4 subbands may not be applied. This is to ensure coexistence with the existing system since the UL transmits only a portion allocated to each STA, unlike the DL. Specifically, this is because legacy legacy STAs may deferral after CCA only if they match the existing transmission bandwidth.
  • FIG. 8 illustrates an example of the pilot position and the number of PPDU STA dependent parts (HE-LTF and / or data).
  • FIG. 8 (a) shows a case where bandwidth is allocated to two STAs by 10 Mhz.
  • the STA of the upper 10MHz can be assigned to the subcarrier index 6 ⁇ 122, and among them, the pilot can be transmitted to 117, 89, 75, 53, 39, 11.
  • subcarrier indexes 63, 64, and 65 may transmit no data.
  • Subcarrier indexes (-6) to (-122) may be allocated to the STA of the lower 10 MHz, and pilots may be located at -117, -89, -75, -53, -39, and -11.
  • the subcarrier indexes -63, -64, and -65 may not transmit any data.
  • the STA of the upper 10 MHz can be allocated up to subcarrier indexes 6 to 122, and pilots can be located at 117, 89, 75, 53, 39, and 11 among them.
  • subcarrier indexes 63, 64, and 65 may transmit no data.
  • the STA of the lower first 5 MHz may be allocated up to subcarrier indexes (-4) to (-60), and pilots may be located at -53, -39, -25, and -11.
  • subcarrier index -32 may not transmit any data.
  • the subcarrier indexes (-68) to (-124) may be allocated to the STA of the lower second 5 MHz, and pilots may be located at -75, -89, -103, and -117. Also, subcarrier index -96 may not transmit any data. 8 (c) is a case where 5, 10, and 5 MHz are allocated to three STAs, respectively. The STA of the upper 5 MHz may be allocated up to subcarrier indexes 68 to 124, and pilots may be located at 117, 103, 89 and 75. In addition, subcarrier index 96 may transmit no data.
  • the intermediate 10MHz STA can be allocated to subcarrier indexes -58 to 58, and pilots can be located at 53, 25, 11, -11, -25, and -53.
  • subcarrier indexes 1, 0, and -1 may transmit no data.
  • the STA of the last 5 MHz can be allocated up to subcarrier indexes (-68) to (-124), and pilots can be located at -75, -89, -103, and -117.
  • subcarrier index -96 may not transmit any data.
  • subcarrier index 96 may transmit no data.
  • STAs of the upper second 5 MHz may be allocated up to subcarrier indexes (4) to (60), and pilots may be located at 53, 39, 25, and 11 therein.
  • subcarrier index 32 may not transmit any data.
  • Subcarrier indexes (-6) to (-122) may be allocated to the STA of the lower 10 MHz, and pilots may be located at -117, -89, -75, -53, -39, and -11. Also, the subcarrier indexes -63, -64, and -65 may not transmit any data.
  • the first 5MHz STAs can be assigned subcarrier indexes 68 through 124, and pilots can be located at 75, 89, 103, and 117. have.
  • subcarrier index 96 may transmit no data.
  • STAs of the upper second 5 MHz may be allocated up to subcarrier indexes (4) to (60), and pilots may be located at 53, 39, 25, and 11 therein.
  • subcarrier index 32 may not transmit any data.
  • the STA of the lower first 5 MHz may be allocated up to subcarrier indexes (-4) to (-60), and pilots may be located at -53, -39, -25, and -11.
  • subcarrier index -32 may not transmit any data.
  • the subcarrier indexes (-68) to (-124) may be allocated to the STA of the lower second 5 MHz, and pilots may be located at -75, -89, -103, and -117. Also, subcarrier index -96 may not transmit any data.
  • the position and number of pilots are the same as the VHT bandwidth option according to the bandwidth option of each subband.
  • the numerology (N_SD, N_SP, N_ST) of each subband may be exactly the same as each bandwidth option of the VHT.
  • one continuous subband may follow 20 MHz numerology of VHT, two subbands may follow 40 MHz numerology, and four may follow 80 MHz numerology.
  • the location and number of pilots can be located equal to the common part of the DL OFDMA.
  • 20 MHz uses the IEEE 802.11ac (VHT) 80 MHz numerology to reduce implementation complexity.
  • VHT IEEE 802.11ac
  • a numerology of VHT 160 MHz can be used.
  • 80MHz we can divide it into two segments (upper 40MHz and lower 40MHz) and each segment can use a 40MHz numerology. 160MHz can also be divided into two segments (upper 80MHz and lower 80MHz) and each segment can use 80MHz numerology
  • each subblock may use the 20 MHz numerology of IEEE 802.11ac (VHT) or IEEE 802.11n (HT) or IEEE 802.11a.
  • VHT IEEE 802.11ac
  • HT IEEE 802.11n
  • IEEE 802.11a For 40MH, divide into two segments (upper 20MHz and lower 20MHz) and each segment can use 20MHz numerology.
  • the 80 MHz is divided into two segments (upper 40 MHz and lower 40 MHz) and each segment can use a 40 MHz numerology.
  • 160MHz can also be divided into two segments (upper 80MHz and lower 80MHz) and each segment can use 80MHz numerology
  • FIG. 9 is a block diagram illustrating a configuration of a wireless device according to an embodiment of the present invention.
  • the AP 10 may include a processor 11, a memory 12, and a transceiver 13.
  • the STA 20 may include a processor 21, a memory 22, and a transceiver 23.
  • the transceivers 13 and 23 may transmit / receive wireless signals and, for example, may implement a physical layer in accordance with the IEEE 802 system.
  • the processors 11 and 21 may be connected to the transceivers 13 and 21 to implement a physical layer and / or a MAC layer according to the IEEE 802 system. Processors 11 and 21 may be configured to perform operations according to the various embodiments of the present invention described above.
  • modules for implementing the operations of the AP and the STA according to various embodiments of the present invention described above may be stored in the memory 12 and 22 and executed by the processors 11 and 21.
  • the memories 12 and 22 may be included inside the processors 11 and 21 or may be installed outside the processors 11 and 21 and connected to the processors 11 and 21 by known means.
  • Embodiments of the present invention described above may be implemented through various means.
  • embodiments of the present invention may be implemented by hardware, firmware, software, or a combination thereof.
  • a method according to embodiments of the present invention may include one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices (DSPDs), and Programmable Logic Devices (PLDs). It may be implemented by field programmable gate arrays (FPGAs), processors, controllers, microcontrollers, microprocessors, and the like.
  • ASICs Application Specific Integrated Circuits
  • DSPs Digital Signal Processors
  • DSPDs Digital Signal Processing Devices
  • PLDs Programmable Logic Devices
  • FPGAs field programmable gate arrays
  • processors controllers, microcontrollers, microprocessors, and the like.
  • the method according to the embodiments of the present invention may be implemented in the form of a module, a procedure, or a function that performs the functions or operations described above.
  • the software code may be stored in a memory unit and driven by a processor.
  • the memory unit may be located inside or outside the processor, and may exchange data with the processor by various known means.
  • Embodiments of the present invention as described above may be applied to various mobile communication systems.

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

Abstract

L'invention concerne un mode de réalisation relatif à un procédé selon lequel un STA reçoit un signal dans un système de communication sans fil, comprenant les étapes consistant à : recevoir une PPDU à partir d'un point d'accès (AP) ; et décoder la PPDU, une bande passante en liaison descendante par laquelle la PPDU est transmise comprenant une unité de ressources pour une pluralité de STA susceptible d'être multiplexée avec le STA et, lors de l'exécution du décodage, le STA suppose qu'il existe une sous-porteuse à courant continu également dans la partie centrale d'une bande passante attribuée au STA, en plus d'être au centre de la bande passante en liaison descendante.
PCT/KR2015/007829 2014-07-28 2015-07-28 Procédé selon lequel un sta reçoit un signal dans un système de réseau local sans fil Ceased WO2016018026A1 (fr)

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WO2017151252A1 (fr) * 2016-03-01 2017-09-08 Intel IP Corporation Accès aléatoire à détection de porteuse
WO2020122523A1 (fr) * 2018-12-13 2020-06-18 엘지전자 주식회사 Procédé et dispositif de transmission de ppdu eht dans un système lan sans fil
CN113055894A (zh) * 2019-12-27 2021-06-29 英特尔公司 用于无线局域网（wlan）的动态资源单元分配

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US20110299382A1 (en) * 2010-06-07 2011-12-08 Qualcomm Incorporated Communication devices for generating and using a matrix-mapped sequence
WO2013073921A1 (fr) * 2011-11-18 2013-05-23 엘지전자 주식회사 Procédé de transmission d'unité de données dans système de réseau local sans fil et appareil le prenant en charge
US20140050259A1 (en) * 2012-08-17 2014-02-20 Shahrnaz Azizi Methods and arrangements for phase tracking in wireless networks
WO2014047444A1 (fr) * 2012-09-20 2014-03-27 Marvell World Trade Ltd. Formats de symbole de multiplexage par répartition orthogonale de la fréquence (ofdm) pour un réseau local sans fil (wlan)

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US20110255620A1 (en) * 2010-04-14 2011-10-20 Qualcomm Incorporated Allocating and receiving tones for a frame
US20110299382A1 (en) * 2010-06-07 2011-12-08 Qualcomm Incorporated Communication devices for generating and using a matrix-mapped sequence
WO2013073921A1 (fr) * 2011-11-18 2013-05-23 엘지전자 주식회사 Procédé de transmission d'unité de données dans système de réseau local sans fil et appareil le prenant en charge
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WO2014047444A1 (fr) * 2012-09-20 2014-03-27 Marvell World Trade Ltd. Formats de symbole de multiplexage par répartition orthogonale de la fréquence (ofdm) pour un réseau local sans fil (wlan)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017151252A1 (fr) * 2016-03-01 2017-09-08 Intel IP Corporation Accès aléatoire à détection de porteuse
US10178694B2 (en) 2016-03-01 2019-01-08 Intel IP Corporation Random access with carrier sensing
WO2020122523A1 (fr) * 2018-12-13 2020-06-18 엘지전자 주식회사 Procédé et dispositif de transmission de ppdu eht dans un système lan sans fil
US12003356B2 (en) 2018-12-13 2024-06-04 Lg Electronics Inc. Method and apparatus for transmitting EHT PPDU in wireless LAN system
CN113055894A (zh) * 2019-12-27 2021-06-29 英特尔公司 用于无线局域网（wlan）的动态资源单元分配

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