WO2017043912A1 - Procédé de transmission d'un signal dans un système lan sans fil et dispositif associé - Google Patents

Procédé de transmission d'un signal dans un système lan sans fil et dispositif associé Download PDF

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Publication number
WO2017043912A1
WO2017043912A1 PCT/KR2016/010158 KR2016010158W WO2017043912A1 WO 2017043912 A1 WO2017043912 A1 WO 2017043912A1 KR 2016010158 W KR2016010158 W KR 2016010158W WO 2017043912 A1 WO2017043912 A1 WO 2017043912A1
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sta
stas
rus
ofdma
radio frame
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PCT/KR2016/010158
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English (en)
Korean (ko)
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박성진
조한규
김진민
조경태
박은성
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엘지전자 주식회사
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Publication of WO2017043912A1 publication Critical patent/WO2017043912A1/fr
Priority to US15/918,754 priority Critical patent/US10602510B2/en

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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
    • 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 signal transmission method in a mobile communication system, and more particularly, a method and an apparatus for transmitting a signal based on channel bonding in an access point or station in a WLAN system.
  • 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.
  • IEEE 802.11ad defines performance enhancement for ultra-high throughput in the 60 GHz band, and IEEE 802.11ay for channel bonding and MIMO technology is introduced for the first time in the IEEE 802.11ad system.
  • PPDU Physical Protocol Data Unit
  • an access point transmits and receives a signal to a station (STA), orthogonal frequency division multiple access (OFDMA) scheme
  • STA station
  • OFDMA orthogonal frequency division multiple access
  • a plurality of resource units (RUs) are allocated to a plurality of STAs, and a radio frame is transmitted through an RU allocated to each of the plurality of STAs, but to the STAs to which a plurality of RUs of the plurality of STAs are assigned.
  • the AP proposes a signal transmission / reception method for transmitting the radio frame by applying the same tone mapping method as in the case of channel bonding by the plurality of RU sizes.
  • the same tone mapping method as in the case of channel bonding by the plurality of RU sizes may be applied by using a tone mapping method using subcarriers in a region between RUs allocated to different STAs as guard tones.
  • some subcarriers of the subcarriers in the region between RUs allocated to different STAs are used as data tones, and others are different.
  • the tone mapping method used as the guard tone may be applied to the subcarrier.
  • the radio frame may include a first header field including RU information allocated to each of the plurality of STAs.
  • the first header field may be located before a short training field (STF) field or channel estimation (CE) field for multiple RU operation of an STA to which the plurality of RUs are allocated in the time domain.
  • STF short training field
  • CE channel estimation
  • the first header field may include information on the number of spatial streams transmitted to each of the plurality of STAs.
  • the radio frame includes a second header field including MCS (modulation and coding scheme) information for each of the plurality of STAs, and the second header field is located after the first header field in a time domain. can do.
  • MCS modulation and coding scheme
  • scheduling information may be additionally transmitted to each of the plurality of STAs, and the scheduling information may include allocation information on an OFDMA access period.
  • the scheduling information includes a source association identifier (DID) field and a destination AID field.
  • DID source association identifier
  • the source AID field includes an AID of the AP and the destination AID field.
  • EDMG Enhanced Directional Multi-Gigabit
  • the source AID field may include the EDMG broadcast information or AID of the specific STA.
  • the destination AID field may include the AID of the AP.
  • the scheduling information may be transmitted through an extended schedule element in an enhanced directional multi-gigabit (EDMG) beacon or an announcement frame.
  • EDMG enhanced directional multi-gigabit
  • a station transmits and receives a signal to an access point (AP) in accordance with an orthogonal frequency division multiple access (OFDMA) scheme from the AP.
  • OFDMA orthogonal frequency division multiple access
  • the STA is assigned a plurality of RU.
  • the present invention proposes a signal transmission / reception method for receiving the radio frame by applying the same tone mapping method as in the case of channel bonding by the plurality of RU sizes.
  • the STA repeats the feedback transmission for the bandwidth corresponding to the FFT size of the AP to the bandwidth corresponding to the FFT size of the AP.
  • Feedback transmission may be performed.
  • an access point apparatus for transmitting and receiving signals in a WLAN system, comprising: a transceiver; And a processor connected to the transceiver, the processor controlling the transceiver, wherein the processor allocates a plurality of resource units (RUs) to a plurality of stations (STAs) according to an orthogonal frequency division multiple access (OFDMA) scheme.
  • the processor controls the radio frame to be transmitted through an RU allocated to each of the plurality of STAs, and when the radio frame is transmitted to an STA to which a plurality of RUs are allocated, the access point apparatus is configured to transmit the radio frame to the STA.
  • the present invention proposes an access point apparatus that transmits the radio frame by applying the same tone mapping method as in the case of channel bonding as much as RU.
  • a station apparatus for transmitting and receiving signals in a WLAN system comprising: a transceiver; And a processor connected to the transceiver, the processor controlling the transceiver, wherein the processor comprises one or more resource units of a plurality of resource units (RUs) according to an orthogonal frequency division multiple access (OFDMA) scheme from an access point (AP).
  • OFDMA orthogonal frequency division multiple access
  • a station apparatus for receiving the radio frame by applying the same tone mapping method as in the case of channel bonding by a size is proposed.
  • the present invention provides a method for transmitting / receiving a transmission / receiving through an allocated channel by receiving a frequency resource having at least one resource unit as a minimum unit for each STA. It can be effective.
  • OFDMA orthogonal frequency division multiple access
  • 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 diagram for describing a channel in a 60 GHz band for explaining a channel bonding operation according to an embodiment of the present invention.
  • FIG. 4 is a diagram illustrating a basic method of performing channel bonding in a WLAN system.
  • 5 is a view for explaining the configuration of the beacon interval.
  • FIG. 6 is a diagram for explaining a physical configuration of an existing radio frame.
  • FIG. 7 and 8 are views for explaining the configuration of the header field of the radio frame of FIG.
  • FIG. 12 is a diagram illustrating tone mapping according to the present invention.
  • FIG. 13 is a diagram illustrating a scheduling-based signaling configuration according to the present invention.
  • 14 is a diagram comparing system characteristics according to RU sizes for OFDMA.
  • 15 is a diagram comparing system characteristics according to FFT sizes of PCP / AP and STA.
  • 16 is a view for explaining an apparatus for implementing the method as described above.
  • WLAN system will be described in detail as an example of the mobile communication system.
  • 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.
  • An STA is a logical entity that includes a medium access control (MAC) and a physical layer interface to a wireless medium.
  • the STA is an access point (AP) and a non-AP STA (Non-AP Station). Include.
  • 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 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), a personal basic service set central point / access point (PCP / AP), or a site controller.
  • 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 communicating seamlessly 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 diagram for describing a channel in a 60 GHz band for explaining a channel bonding operation according to an embodiment of the present invention.
  • channel 2 of the channels shown in FIG. 3 may be used in all regions and may be used as a default channel.
  • Channels 2 and 3 can be used in most of the designations except Australia, which can be used for channel bonding.
  • a channel used for channel bonding may vary, and the present invention is not limited to a specific channel.
  • FIG. 4 is a diagram illustrating a basic method of performing channel bonding in a WLAN system.
  • FIG. 4 illustrates the operation of 40 MHz channel bonding by combining two 20 MHz channels in an IEEE 802.11n system.
  • 40/80/160 MHz channel bonding will be possible.
  • the two exemplary channels of FIG. 4 include a primary channel and a secondary channel, so that the STA may examine the channel state in a CSMA / CA manner for the primary channel of the two channels. If the secondary channel is idle for a predetermined time (e.g. PIFS) at the time when the primary channel idles for a constant backoff interval and the backoff count becomes zero, the STA is assigned to the primary channel and Auxiliary channels can be combined to transmit data.
  • PIFS a predetermined time
  • channel bonding when channel bonding is performed based on contention as illustrated in FIG. 4, channel bonding may be performed only when the auxiliary channel is idle for a predetermined time at the time when the backoff count for the primary channel expires. Therefore, the use of channel bonding is very limited, and it is difficult to flexibly respond to the media situation.
  • an aspect of the present invention proposes a method in which an AP transmits scheduling information to STAs to perform access on a scheduling basis. Meanwhile, another aspect of the present invention proposes a method of performing channel access based on the above-described scheduling or on a contention-based basis independently of the above-described scheduling. In addition, another aspect of the present invention proposes a method for performing communication through a spatial sharing technique based on beamforming.
  • 5 is a view for explaining the configuration of the beacon interval.
  • the time of the medium may be divided into beacon intervals. Lower periods within the beacon interval may be referred to as an access period. Different connection intervals within one beacon interval may have different access rules.
  • the information about the access interval may be transmitted to the non-AP STA or the non-PCP by an AP or a personal basic service set control point (PCP).
  • PCP personal basic service set control point
  • one beacon interval may include one beacon header interval (BHI) and one data transfer interval (DTI).
  • BHI may include a Beacon Transmission Interval (BTI), an Association Beamforming Training (A-BFT), and an Announcement Transmission Interval (ATI).
  • BTI Beacon Transmission Interval
  • A-BFT Association Beamforming Training
  • ATI Announcement Transmission Interval
  • the BTI means a section in which one or more DMG beacon frames can be transmitted.
  • A-BFT refers to a section in which beamforming training is performed by an STA that transmits a DMG beacon frame during a preceding BTI.
  • ATI means a request-response based management access interval between PCP / AP and non-PCP / non-AP STA.
  • one or more Content Based Access Period (CBAP) and one or more Service Periods (SPs) may be allocated as data transfer intervals (DTIs).
  • CBAP Content Based Access Period
  • SPs Service Periods
  • DTIs data transfer intervals
  • PHY MCS note Control PHY 0 Single carrier PHY (SC PHY) 1 ... 1225 ... 31 (low power SC PHY) OFDM PHY 13 ... 24
  • modulation modes can be used to meet different requirements (eg, high throughput or stability). Depending on your system, only some of these modes may be supported.
  • FIG. 6 is a diagram for explaining a physical configuration of an existing radio frame.
  • DMG Directional Multi-Gigabit
  • the preamble of the radio frame may include a Short Training Field (STF) and a Channel Estimation (CE).
  • the radio frame may include a header and a data field as a payload and optionally a training field for beamforming.
  • FIG. 7 and 8 are views for explaining the configuration of the header field of the radio frame of FIG.
  • FIG. 7 illustrates a case in which a single carrier (SC) mode is used.
  • SC single carrier
  • a header indicates information indicating an initial value of scrambling, a modulation and coding scheme (MCS), information indicating a length of data, and additional information.
  • MCS modulation and coding scheme
  • Information indicating the presence of a physical protocol data unit (PPDU), packet type, training length, aggregation, beam-framing request, last RSSI (Received Signal Strength Indicator), truncation, header check sequence (HCS) Information may be included.
  • PPDU physical protocol data unit
  • packet type packet type
  • training length aggregation
  • beam-framing request aggregation
  • last RSSI Receiveived Signal Strength Indicator
  • HCS header check sequence
  • the header has 4 bits of reserved bits, which may be used in the following description.
  • the OFDM header includes information indicating the initial value of scrambling, MCS, information indicating the length of data, information indicating the presence or absence of additional PPDUs, packet type, training length, aggregation, beam beaming request, last RSSI, truncation, Information such as a header check sequence (HCS) may be included.
  • HCS header check sequence
  • the header has 2 bits of reserved bits, and in the following description, such reserved bits may be utilized as in the case of FIG. 7.
  • the IEEE 802.11ay system is considering introducing channel bonding and MIMO technology for the first time in the existing 11ad system.
  • a new PPDU structure is needed. That is, the existing 11ad PPDU structure has limitations in supporting legacy terminals and implementing channel bonding and MIMO.
  • a new field for the 11ay terminal may be defined after the legacy preamble and the legacy header field for supporting the legacy terminal.
  • channel bonding and MIMO may be supported through the newly defined field.
  • FIG. 9 illustrates a PPDU structure according to one preferred embodiment of the present invention.
  • the horizontal axis may correspond to the time domain and the vertical axis may correspond to the frequency domain.
  • a frequency band (eg, 400 MHz band) of a predetermined size may exist between frequency bands (eg, 1.83 GHz) used in each channel.
  • legacy preambles legacy STFs, legacy: CEs
  • a new STF and a legacy ST can be simultaneously transmitted through a 400 MHz band between each channel. Gap filling of the CE field may be considered.
  • the PPDU structure according to the present invention transmits ay STF, ay CE, ay header B, and payload in a broadband manner after legacy preamble, legacy header, and ay header A.
  • ay header, ay Payload field, and the like transmitted after the header field may be transmitted through channels used for bonding.
  • the ay header may be referred to as an enhanced directional multi-gigabit (EDMG) header to distinguish the ay header from the legacy header, and the name may be used interchangeably.
  • EDMG enhanced directional multi-gigabit
  • the ay header and the ay payload may be transmitted through 2.16 GHz, 4.32 GHz, 6.48 GHz, and 8.64 GHz bandwidth.
  • the PPDU format when repeatedly transmitting the legacy preamble without performing the gap-filling as described above may also be considered.
  • ay STF, ay CE, and ay header B are replaced by a legacy preamble, legacy header, and ay header A without a GF-Filling and thus without the GF-STF and GF-CE fields shown by dotted lines in FIG. 8. It has a form of transmission.
  • the present invention proposes an Orthogonal Frequency Division Multiple Access (OFDMA) method as a method for simultaneous transmission of data by STAs having different channel bonding capabilities.
  • OFDMA Orthogonal Frequency Division Multiple Access
  • the OFDMA resource unit (RU) unit may be a channel unit (2.16 GHz) of the 11ay system or may be set smaller than the channel unit (2.16 GHz).
  • each 11ay STA may have a different channel bonding capability.
  • 11ay STAs participating in the OFDMA may be equal to the FFT size of the PCP / AP.
  • FIG. 10 and 11 illustrate a PPDU format for OFDMA according to the present invention.
  • FIG. 10 illustrates a PPDU format for OFDMA when a single channel is assigned to each STA (not including channel bonding)
  • FIG. 11 illustrates a case where a plurality of channels are allocated to a specific STA
  • FIG. 1 illustrates a PPDU format for OFDMA.
  • the PCP / AP may allocate the same RU size to each STA or may allocate the same differently.
  • Each STA may transmit data in the OFDMA scheme using as many channels as possible corresponding to its maximum channel bonding capability. Accordingly, the RU size may vary from a bandwidth corresponding to one channel to a bandwidth corresponding to six channels. Alternatively, even when the basic RU size is set smaller than the bandwidth of one channel, the RU size may be variously modified up to a bandwidth corresponding to up to six channels.
  • subcarriers between channels corresponding to RUs allocated to respective STAs may be used as guard tones.
  • the corresponding subcarriers may be transmitted by nulling.
  • the PCP / AP may determine the specific STA.
  • the same tone mapping method as that of the channel bonding of the plurality of channels is applied.
  • the PCP / AP may transmit a PPDU format to the specific STA by applying a tone mapping method such as two channel bonding. .
  • the PCP / AP may transmit a signal to the specific STA by reusing a tone mapping method of two channel bonding.
  • the tone mapping method such as a plurality of channel bonding may include a tone mapping method using subcarriers in a region between RUs allocated to different STAs as data tones, and using some other subcarriers as guard tones.
  • the PCP / AP transmits a signal according to the OFDMA method to an STA to which an RU having the same bandwidth as that of a certain number of channels is allocated, the PCP / AP includes a tone mapping method for channel bonding of the predetermined number of channels.
  • all subcarriers between channels can be used as guard tones, or some of them as data tones.
  • FIG. 12 is a diagram illustrating tone mapping according to the present invention.
  • FIG. 12 is a diagram illustrating bandwidths corresponding to two channels, and illustrates a case in which tone mapping of an OFDM PHY defined in an 11ad system is applied.
  • tone mappings configured such that DCs are located in the centers may be applied to tones allocated to each STA.
  • CH1 is assigned to the first STA
  • CH2 is assigned to the second STA
  • a subcarrier (or tone) corresponding to 0.33 GHz located between them may be used as the guard tone. This can mitigate interference from adjacent subcarriers.
  • subcarriers used as guard tones among subcarriers located between channels allocated to each STA may be variably determined within 0.33 GHz.
  • EDMG header A may be transmitted in a duplicate mode on the channels used in OFDMA.
  • the PCP / AP may provide RU information allocated to each STA through the EDMG header A of the PPDU format.
  • the EDMG header A of the PPDU format may include RU information allocated to each STA.
  • Each STA participating in the OFDMA may know the RU allocated to it by decoding the EDMG header A through a primary channel established by the system.
  • the EDMG header A may be located before the Short Training Field (STF) field or the Channel Estimation (CE) field for multi-RU operation of an STA to which a plurality of RUs are allocated in the time domain. have. Through this, each STA may acquire information included in the EDMG header A before performing a multi-channel operation.
  • STF Short Training Field
  • CE Channel Estimation
  • the EDMG header A may be a RU allocation field for each STA and may include the following fields.
  • STA 1 Field Bits Description RU allocation
  • STA 2 AID or Partial AID T.B.D.
  • RU allocation allocated RU size (unit of channel bandwidth) Number of SS RU allocation
  • STA 3 AID or Partial AID RU allocation allocated RU size (unit of channel bandwidth) Number of SS RU allocation
  • STA 4 AID or Partial AID RU allocation allocated RU size (unit of channel bandwidth) Number of SS
  • the PCP / AP may support up to six STAs according to the OFDMA scheme.
  • the PCP / AP may support as many STAs as the number of channels capable of channel bonding.
  • group ID information including each STA may be used instead of AID information of each STA.
  • the EDMG header A may include information on the number of spatial streams transmitted to each STA.
  • OFDMA MU-MIMO may be supported by including several AID subfields in the RU allocation field of Table 2 and defining the number of spatial streams (Number of SS) in the subfields therein.
  • the RU allocation field of Table 2 may be configured as follows.
  • STA0 primary channel 1: 2 channel bonding (primary channel + secondary channel 1) 2: 2 channel bonding (primary channel + secondary channel 2) 3: 2 channel bonding (primary channel + secondary channel 3) 4: 3 channel bonding (primary channel + secondary channels 1,2) 5: 3 channel bonding (primary channel + secondary channels 1,3) 6: 3 channel bonding (primary channel + secondary channels 2,3) 7: 4 channel bonding (primary channel + secondary channels 1,2,3) 0: reserved
  • EDMG Header B contains device specific information.
  • the PCP / AP may provide specific information for each STA through the EDMDG header B.
  • the EDMG header B may include the following information.
  • Length For example, the length information in the legacy header may be reused to differentially inform.
  • Modulation and Coding Scheme For example, the length information in the legacy header may be reused to differentially inform.
  • the EDMG header B may be omitted in the 11ay OFDMA PPDU format.
  • the EDMG header B may be located after the EDMG header A in the time domain in the PPDU format.
  • PCP / APs and STAs use the body of management frames (including beacon frames, association frames, etc.) that contain EDMG capabilities elements to support channel bonding capabilities of PCP / AP and (non-PCP / AP) STAs. Can be directed.
  • the EDMG capability element may include a supported channel width set field indicating the channel bonding capabilities of the PCP / AP and the STA.
  • the PCP / AP and STA may define a new field in the EDMG capability element to indicate capability for multi input multi output (MIMO) and OFDMA.
  • MIMO multi input multi output
  • OFDMA OFDMA
  • An extended schedule element is defined in the beacon frame body or announce frame body of the conventional 11ad system.
  • 13 illustrates a configuration of the extension schedule element and a configuration for signaling the extension schedule element through a beacon.
  • the PCP / AP may allocate STAs to the CBAP and the SP periods, which are channel access methods in the DTI period, to the STAs through the extended schedule element.
  • the PCP / AP or STA may support OFDMA using the source AID and the destination AID of the extended schedule element. More specifically, by configuring the source AID and the destination AID as shown in the table below, it may indicate whether to support downlink OFDMA or uplink OFDMA during a predetermined length allocation period.
  • EDMG Broadcast means a broadcast signal targeting only 11ay STAs capable of supporting OFDMA, and Intended STAs mean a specific STA to be selected.
  • STAs that support OFDMA enable channel access, and STAs that do not support OFDMA (for example, legacy STAs) have power for a predetermined time allocated by such signaling. It can operate in sleep mode to reduce consumption.
  • STAs may also transmit and receive signals by applying the OFDMA method without the PCP / AP.
  • an STA capable of transmitting a signal to the OFDMA may be designated as a source AID of an extended schedule element (Peer-to-Machine, etc.).
  • the aforementioned Intended STAs may be individually designated.
  • a source AID or a destination AID may be designated as one STA.
  • the channel access interval in time by using Allocation Start, Allocation Block Duration, Number of Blocks, and Allocation Block Period in each Allocation #n. Can be scheduled to overlap.
  • a source AID or a destination AID may be specified using a group ID other than EDMG Broadcast or Intended STA.
  • the OFDMA method may be applied only in the SP interval or may be applied only in the CBAP interval. Alternatively, it may be applied to both SP and CBAP intervals.
  • a trigger frame in order to support uplink OFDMA, a trigger frame must be newly defined, and the trigger frame may be configured in a control PHY mode.
  • the allocation control field (extended schedule element-> allocation #n-> allocation control field) shown in FIG. 13 includes an allocation type subfield.
  • the PCP / AP and the STA may indicate 'OFDMA allocation' through a reserved bit in the allocation type subfield.
  • the channel access method may be used for OFDMA only in the DTI period.
  • EDMG Broadcast may reuse broadcasts supported by the existing system without having to be newly defined. This is because the STA capable of decoding the 'OFDMA allocation' signaling can only be the 11ay STA proposed in the present invention.
  • the AID configuration shown in Table 8 together with the 'OFDMA allocation' signaling may indicate whether the OFDMA operation is an uplink OFDMA or a downlink OFDMA.
  • FIG. 14 is a diagram illustrating a result of comparing the case where the RU size is one channel bandwidth (hereinafter, the first case) and the case where the RU size is smaller than the one channel bandwidth (hereinafter, the second case).
  • a signal may be transmitted to up to four STAs simultaneously in the first case and eight STAs simultaneously in the second case. Can be transmitted.
  • the second case has more STAs that can be supported than the first case. As the number of STAs increases, signaling and scheduling overhead may increase. In particular, in the second case it can be difficult to expect high gain without fine frequency scheduling.
  • the second case is that the coherent bandwidth may be large due to Extreme High Frequency (EHF) characteristics, but the total reporting time is linearly dependent on the number of STAs that support it. Can be increased.
  • EHF Extreme High Frequency
  • the first case may reuse the MU-MIMO frame structure of the conventional system.
  • an optimized frame structure for OFDMA needs to be newly defined.
  • FIG. 15 is a diagram comparing the case where the FFT sizes of the PCP / AP and the STA are the same (hereinafter, the third case) and when different (hereinafter, the fourth case).
  • the STA having the same FFT size as the FFT size of the PCP / AP can participate in the OFDMA, while in the fourth case, the STA having the FFT size different from the FFT size of the PCP / AP can also participate in the OFDMA.
  • one or more STAs may report channel state information for all frequencies used for OFDMA transmission at a time.
  • one or more STAs may report only channel state information about a partial frequency of their FFT size at a time. Therefore, reporting of all channels may take more time than in the third case.
  • the FFT sizes of STAs participating in the OFDMA may vary, and accordingly, the FFT size of the STA may be smaller than the FFT size used by the PCP / AP to transmit the PPDU. For this reason, the STA may not feed back information on channels used by the PCP / AP to transmit a signal at one time.
  • the STA according to the present invention may feed back channel state information to the PCP / AP through the following method.
  • the STA may perform feedback on channels used by the PCP / AP for PPDU transmission several times. That is, the STA may perform feedback on the bandwidth corresponding to the FFT size of the PCP / AP by performing the padback as many times as the bandwidth corresponding to the FFT size thereof.
  • the STA feeds back channel information about a channel performing decoding (preferably, a primary channel) only once, and the PCP / AP transmits other channels to the main channel based on characteristics of the ultra-high frequency band. It can be assumed that the state is similar, so that the state of the entire channel band can be obtained.
  • the STA may increase overhead by reducing overhead and using as many frequency resources as possible through random scheduling by PCP / AP.
  • 16 is a view for explaining an apparatus for implementing the method as described above.
  • the wireless device 800 of FIG. 16 may correspond to a specific STA of the above description, and the wireless device 850 may correspond to the PCP / AP of the above description.
  • the STA 800 may include a processor 810, a memory 820, and a transceiver 830, and the PCP / AP 850 may include a processor 860, a memory 870, and a transceiver 880. can do.
  • the transceiver 830 and 880 may transmit / receive a radio signal and may be executed in a physical layer such as IEEE 802.11 / 3GPP.
  • the processors 810 and 860 are executed at the physical layer and / or MAC layer, and are connected to the transceivers 830 and 880. Processors 810 and 860 may perform the aforementioned UL MU scheduling procedure.
  • Processors 810 and 860 and / or transceivers 830 and 880 may include application-specific integrated circuits (ASICs), other chipsets, logic circuits and / or data processors.
  • the memories 820 and 870 may include read-only memory (ROM), random access memory (RAM), flash memory, memory cards, storage media and / or other storage units.
  • ROM read-only memory
  • RAM random access memory
  • flash memory memory cards
  • the method described above can be executed as a module (eg, process, function) that performs the functions described above.
  • the module may be stored in the memory 820, 870 and executed by the processors 810, 860.
  • the memories 820 and 870 may be disposed inside or outside the processes 810 and 860 and may be connected to the processes 810 and 860 by well-known means.
  • the present invention has been described assuming that it is applied to an IEEE 802.11-based WLAN system, but the present invention is not limited thereto.
  • the present invention can be applied in the same manner to various wireless systems capable of data transmission based on channel bonding.

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

Abstract

La présente invention concerne un procédé de transmission d'un signal par un point d'accès (AP) dans un système LAN sans fil (WLAN) et un dispositif associé. Plus précisément, la présente invention concerne un procédé de transmission d'un signal par un AP ou une station sur la base d'une liaison de canaux dans un système WLAN, et un dispositif associé.
PCT/KR2016/010158 2015-09-11 2016-09-09 Procédé de transmission d'un signal dans un système lan sans fil et dispositif associé WO2017043912A1 (fr)

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US201562217047P 2015-09-11 2015-09-11
US62/217,047 2015-09-11
US201562249372P 2015-11-02 2015-11-02
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