WO2018044066A1 - Procédé destiné à l'émission-réception de signaux dans un système de réseau local sans fil, et dispositif associé - Google Patents

Procédé destiné à l'émission-réception de signaux dans un système de réseau local sans fil, et dispositif associé Download PDF

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WO2018044066A1
WO2018044066A1 PCT/KR2017/009483 KR2017009483W WO2018044066A1 WO 2018044066 A1 WO2018044066 A1 WO 2018044066A1 KR 2017009483 W KR2017009483 W KR 2017009483W WO 2018044066 A1 WO2018044066 A1 WO 2018044066A1
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ppdu
field
channel
edmg
channels
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PCT/KR2017/009483
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English (en)
Korean (ko)
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김진민
조한규
박성진
조경태
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엘지전자 주식회사
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes

Definitions

  • the following description relates to a method for transmitting / receiving a signal of a station in a WLAN system, and more particularly, to a method for transmitting and receiving a signal through a channel bonded to a plurality of channels and an apparatus therefor.
  • A-PPDU Aggregation PPDU
  • PPDUs Physical Protocol Data Units
  • 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.
  • the present invention proposes technical matters necessary for a station to bond a plurality of channels to transmit and receive a signal.
  • a method and apparatus for transmitting and receiving an A-PPDU (Aggregation-PPDU) in which a plurality of PPDU Physical Protocol Data Units (SDUs) are continuously included in a time dimension through a channel in which a plurality of channels are bonded Suggest.
  • A-PPDU Aggregation-PPDU
  • SDUs Physical Protocol Data Units
  • a first station transmits a signal to a second STA through a channel bonded with a plurality of channels, the plurality of physical protocol data units ) Transmits an A-PPDU (Aggregation-PPDU), which is continuously included in the time dimension, to the second STA through a channel bonded with the plurality of channels, but is first in time order among the PPDUs included in the A-PPDU.
  • STA first station
  • A-PPDU Aggregation-PPDU
  • the EDMG header A field included in the PPDU is transmitted in Single Carrier (SC) mode for a single channel, and the EDMG header A field included in the PPDU except for the first PPDU in chronological order among the PPDUs included in the A-PPDU,
  • the plurality of channels in the form of two unit blocks generated by dividing the bit information for each EDMG header A field into two parts, changing the phase by the number of bonded channels according to a predetermined rule, and repeatedly placing the parts Bonded Propose that is sent to (Orthogonal Frequency Division Multiplexing) OFDM mode for a channel, a signal transmission method.
  • a method in which a first station (STA) receives a signal from a second STA through a channel bonded to a plurality of channels in a WLAN system the plurality of physical protocol data units Receive the A-PPDU from the second STA through a channel to which the plurality of channels are bonded, and include an A-PPDU (A-PPDU) including consecutively in the time dimension, and among the PPDUs included in the A-PPDU.
  • A-PPDU A-PPDU
  • the EDMG header A field included in the first PPDU in chronological order is transmitted in Single Carrier (SC) mode for a single channel, and the EDMG included in the PPDU excluding the first PPDU in chronological order among the PPDUs included in the A-PPDU.
  • SC Single Carrier
  • the header A field is in the form of two unit blocks generated by dividing the bit information for each EDMG header A field into two parts, and repositioning each part by changing the phase by the number of bonded channels according to a predetermined rule. remind The number of channels to propose, a method of receiving a signal that is sent to (Orthogonal Frequency Division Multiplexing) OFDM mode for a bonded channel.
  • a station apparatus for transmitting a signal through a channel in which a plurality of channels are bonded in a WLAN system, wherein the station apparatus has at least one RF chain and another station A transceiver configured to transmit and receive a signal with the apparatus; And a processor connected to the transceiver, the processor configured to process a signal transmitted / received with the other station apparatus, wherein the processor includes a plurality of physical protocol data units (PPDUs) in succession in time dimension.
  • PPDUs physical protocol data units
  • Is configured to transmit (Aggregation-PPDU) to the other station device through the channel bonded with the plurality of channels, and the EDMG header A field included in the first PPDU in chronological order among the PPDUs included in the A-PPDU is
  • the EDMG header A field which is transmitted in SC (Single Carrier) mode for the channel and is included in the PPDU except the first PPDU in time order, among the PPDUs included in the A-PPDU, contains bit information about each EDMG header A field.
  • the plurality of channels in the form of two unit blocks generated by dividing into two parts and changing the phase by the number of bonded channels according to a predetermined rule and repeatedly placing the parts Sent to (Orthogonal Frequency Division Multiplexing) mode for the coded OFDM channel, it proposes a station device.
  • a station apparatus for receiving a signal through a channel in which a plurality of channels are bonded in a WLAN system, wherein the station apparatus has one or more radio frequency (RF) chains and another station A transceiver configured to transmit and receive a signal with the apparatus; And a processor connected to the transceiver, the processor configured to process a signal transmitted / received with the other station apparatus, wherein the processor includes a plurality of physical protocol data units (PPDUs) in succession in time dimension.
  • RF radio frequency
  • EDMG (Aggregation-PPDU) is configured to receive the A-PPDU from the other station device through a channel bonded the plurality of channels, and included in the first PPDU in chronological order among the PPDUs included in the A-PPDU
  • the header A field is transmitted in Single Carrier (SC) mode for a single channel
  • SC Single Carrier
  • the EDMG header A field included in the PPDU excluding the first PPDU in time order among the PPDUs included in the A-PPDU is each EDMG header A field.
  • the bit information is divided into two parts, and each part is shifted in phase by the number of bonded channels according to a predetermined rule and repeatedly arranged in the form of two unit blocks.
  • the channels are sent to (Orthogonal Frequency Division Multiplexing) OFDM mode for a bonded channel, we propose a station device.
  • the first PPDU in a time order among the PPDUs included in the A-PPDU is a legacy STF (Legacy-Short Training Field, L-STF) field, a legacy channel (Legacy Channel Estimation, L-CE) field, a legacy header ( Legacy-Header, L-Header) field, EDMG header A field, EDMG-STF field, EDMG-CE field, data field, and includes the first PPDU included in the order of time among the PPDU included in the A-PPDU
  • the L-STF field, the L-CE field, the L-Header field, and the EDMG header A field are duplicated and transmitted for each single channel, and are included in the first PPDU in chronological order among the PPDUs included in the A-PPDU.
  • the EDMG-STF field, EDMG-CE field, and data field may be transmitted through a channel in which the plurality of channels are bonded.
  • the PPDU excluding the first PPDU in time order among the PPDUs included in the A-PPDU includes one EDMG header A field and one data field, and the one EDMG header A field is the one data field. It can be located earlier in the time dimension.
  • a rule of accumulating and rotating each part by a predetermined phase phase and repeatedly arranging the number of bonded channels may be applied.
  • ⁇ / 2 or ⁇ may be applied as the predetermined magnitude of the phase.
  • a rule for repeatedly arranging each part by the number of bonded channels, and arranging a value corresponding to a complex conjugate value of each part may be applied to an even number.
  • the station according to the present invention may transmit and receive an A-PPDU including a plurality of PPDUs through a channel in which a plurality of channels are bonded.
  • 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. 10 is a diagram schematically illustrating a PPDU structure applicable to the present invention.
  • FIG. 11 is a diagram illustrating a correspondence relationship between spatial streams for each LDPC encoder when the total number of spatial streams is even when two LDPC encoders are provided according to the present invention.
  • FIG. 12 is a diagram illustrating two LDPC encoders according to the present invention. In the case where an encoder is provided, a diagram illustrates a correspondence relationship between spatial streams for each LDPC encoder when the total number of spatial streams is an odd number.
  • FIG. 13 is a diagram briefly showing an EDMG A-PPDU format applicable to the present invention.
  • FIG. 14 is a diagram illustrating an A-PPDU format transmitted through a single channel and an A-PPDU format when transmitted through a channel bonding scheme according to a single carrier (SC) mode.
  • SC single carrier
  • FIG. 15 illustrates an A-PPDU format transmitted through a single channel and an A-PPDU format transmitted through a channel bonding scheme according to an orthogonal frequency division multiplexing (OFDM) mode.
  • OFDM orthogonal frequency division multiplexing
  • FIG. 16 is a diagram briefly illustrating a method of configuring an EDMG Header-A field after a second PPDU in an A-PPDU when the A-PPDU is transmitted through a channel bonding transmission scheme in SC mode.
  • FIG. 17 is a diagram briefly showing a method of configuring an EDMNG Header-A field after a second PPDU in an A-PPDU when the A-PPDU is transmitted in a channel bonding transmission scheme in an OFDM mode.
  • 18 is a diagram 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 data field as a header and 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
  • PPDU physical protocol data unit
  • packet type packet type
  • training length training length
  • aggregation aggregation
  • beam training request last RSSI (Received Signal Strength Indicator), truncation
  • 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 an initial value of scrambling, an MCS, information indicating a length of data, information indicating whether an additional PPDU exists, packet type, training length, aggregation, beam training request, last RSSI, truncation, and HCS. (Header Check Sequence) may be included.
  • 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.
  • 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 CE are simultaneously transmitted together with the legacy preambles through a 400 MHz band between each channel. Gap filling 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
  • a total of six or eight channels may exist in 11ay, and a single STA may bond and transmit up to four channels.
  • the ay header and ay Payload may be transmitted through 2.16 GHz, 4.32 GHz, 6.48 GHz, 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 wide band after legacy preamble, legacy header, and ay header A without performing the gap-filling. It has a form of transmission.
  • FIG. 10 is a diagram schematically illustrating a PPDU structure applicable to the present invention. Briefly summarizing the above-described PPDU format can be represented as shown in FIG.
  • the PPDU format applicable to the 11ay system includes L-STF, L-CE, L-Header, EDMG-Header-A, EDMG-STF, EDMG-CEF, EDMG-Header-B, Data, It may include a TRN field, which may be selectively included according to the type of the PPDU (eg, SU PPDU, MU PPDU, etc.).
  • a portion including the L-STF, L-CE, and L-header fields may be referred to as a non-EDMG portion, and the remaining portion may be referred to as an EDMG region.
  • the L-STF, L-CE, L-Header, and EDMG-Header-A fields may be called pre-EDMG modulated fields, and the rest may be called EDMG modulated fields.
  • the 11ay system to which the present invention is applicable supports up to eight streams. Accordingly, in the 11ay system according to the present invention, different MCS may be applied to each stream.
  • applying different MCS to each stream may have an advantage of improving link throughput, but requires an LDPC encoder / decoder by the number of different coding rates so that hardware may be used. It may also have the disadvantage that the complexity increases and the signaling overhead for feedback for each stream increases.
  • the same MCS may be applied to one or more streams instead of applying different MCSs to each stream.
  • the number of applicable different MCSs is limited to a maximum of two or four, so that one or more streams may have the same MCS.
  • the number of MCSs applicable to the 8 streams is limited to 2 or 4 in the present invention, so that some of the 8 streams may have the same MCS. have.
  • the 11ay system to which the present invention is applicable supports channel combining or channel bonding.
  • the STA may support two-channel combining using the hardware of the existing DMG device. This makes it easier to improve throughput.
  • channel combining has a feature that a low cost or low complexity can lead to channel bonding similar performance.
  • the STA may perform three channel combining or four channel combining by using three or four pieces of hardware of the existing DMG device.
  • each DMG device or modem may independently perform encoding / decoding of data without additional hardware complexity.
  • the MCS for the channel combining may be indicated separately.
  • the channel combining proposed by the present invention includes not only a continuous channel but also a combination of non-contiguous channels. If the 11ay system according to the present invention supports the combination of non-continuous channels, the link quality for each channel may be very different. In this case it may be appropriate to assign a different MCS for each of the channel coupled non-contiguous channels. Accordingly, in the present invention, by separately setting the MCS for each channel at the time of channel combining, the STA can efficiently perform link adaptation.
  • the MCS field for the secondary channel at this time may be used for other purposes or reserved bits when the operation of the STA is a channel bonding or a single channel operation.
  • the contents of the EDMG Header-A configured as described above may be variously configured as follows.
  • the EDMG Header-A field may include an MCS field, and the MCS field may indicate MCS information of streams in a SU-MIMO situation.
  • the example of Table 2 assumes that one MCS has a size of 6 bits, and that the maximum number of types of MCSs that can be supported in the SU-MIMO situation is two.
  • the EDMG Header-A field may include a secondary channel MCS field, and the subchannel MCS field may indicate MCS information of a subchannel when channel combining is performed.
  • the example of Table 2 assumes that one MCS has a size of 6 bits and that the maximum number of MCS types that can be supported in the channel combining situation is two.
  • the EDMG Header-A field according to the present invention may be configured by combining the proposed method for combining the MIMO and the channel proposed above as shown in Table 3.
  • the EDMG Header-A field may include an MCS field and a Second MCS field.
  • the MCS field indicates information about the first MCS set for SU-MIMO.
  • the Second MCS field may be interpreted differently depending on whether or not the corresponding PPDU is transmitted through channel combining by BW information.
  • the Second MCS field is interpreted as indicating information about MCS (set) for some streams. Can be.
  • the Second MCS field may be interpreted as indicating MCS information about a second channel.
  • streams of each channel have the same MCS information
  • MCS information of all streams of a primary channel is indicated through an MCS field
  • information of all streams of a subchannel is indicated by a second MCS. Can be indicated through the field.
  • Table 3 shows an EDMG Header-A configuration in which the maximum number of MCS information is limited to two regardless of whether SU-MIMO or channel is combined
  • the maximum number of MCS information may be extended to four according to an embodiment.
  • the maximum number of MCSs that can be allocated to each channel in the PPDU transmitted through channel combining may be two.
  • a short SSW frame of short length may be applied to reduce the sector sweep time.
  • the configuration and each field of the short SSW frame may be configured as shown in the table below.
  • the short SSW frame or the SSW frame as described above may not include a frame control field. Accordingly, the overhead of receiving the (short) SSW frame may require blind detection in order to recognize whether the received frame is the (short) SSW frame.
  • the EDMG Header-A field applicable to the present invention may further include a field having a bit size of 1 bit or more bits indicating that the payload portion is composed of a (short) SSW frame.
  • the number of spatial streams indicates the number of streams transmitted through the corresponding channel.
  • the information may be used to indicate the number of streams of a single channel or each channel bonded to the channel.
  • the EDMG Header-A field may include a field indicating the number of streams for each channel.
  • the EDMG Header-A field may require twice as many bits as a single channel in order to indicate the number of streams operated independently for each channel.
  • fields such as the number of spatial streams for the primary channel and the number of spatial streams for the secondary channel are filled with EDMG Header-A. Can be transmitted through the field.
  • the restriction that the number of streams of each channel is set to the same may be applied in the case of channel combined transmission.
  • the EDMG Header-A field may indicate the number of streams of all channels through one field (eg, number of spatial streams).
  • each channel may be limited to having only one stream.
  • the number of MCSs defined for the spatial stream in SU-MIMO may be set to one of one to four values.
  • the output of one low density parity check (LDPC) encoder may be mapped to the spatial streams.
  • LDPC low density parity check
  • each MCS field disclosed in Table 2 or Table 3 may indicate an MCS level for each combined channel.
  • beams transmitted in different directions may reduce spatial correlation.
  • path loss in each direction may vary.
  • a plurality of MCSs may be required for each spatial stream.
  • multiple MCSs can be defined for each spatial stream.
  • two different MCSs may be defined for spatial streams in consideration of hardware complexity, but the method proposed by the present invention is not limited to the above configuration.
  • mapping method may be set by explicit indication. In this case, however, an additional indication bit may be required.
  • mapping method may be implicitly indicated by a mapping table. In this case no additional indication bits are needed. In this case, the following mapping table may be applied to the mapping table.
  • the following table shows a mapping relationship when two different MCSs are applied to each spatial stream.
  • x (m) (m) means the nth bit of the spatial stream m
  • c (j) (i) means the i-th output bit of the LDPC encoder j.
  • the spatial bit streams mapped to the 1,2,3,4,5,6,7,8th streams are x (0) , x (1) , x (2) , x ( 3) , x (4) , x (5) , x (6) and x (7) .
  • the mapping relationship is as follows.
  • the mapping method may be based on a round robin method.
  • the relationship between the spatial streams corresponding to each LDPC encoder may be set as shown in FIGS. 11 and 12.
  • FIG. 11 is a diagram illustrating a correspondence relationship between spatial streams for each LDPC encoder when the total number of spatial streams is even when two LDPC encoders are provided according to the present invention.
  • FIG. 12 is a diagram illustrating two LDPC encoders according to the present invention. In the case where an encoder is provided, a diagram illustrates a correspondence relationship between spatial streams for each LDPC encoder when the total number of spatial streams is an odd number.
  • each stream parser may have up to four streams and may operate in a round robin manner.
  • the EDMG Header-A field capable of simultaneously supporting the SU-MIMO operation and the channel combining operation, two different MCSs may be applied for the spatial stream.
  • the EDMG Header-A may be configured as one of the following two options.
  • the total number of MCSs may be set to two regardless of channel combining.
  • one MCS may be used for the spatial stream.
  • the EDMG Header-A field according to the present invention may always include two MCS fields.
  • the total number of MCSs when using channel combining may be set to four.
  • two MCSs may be used for the spatial stream in each combined channel.
  • the EDMG Header-A field according to the present invention may include four MCS fields in channel combining. .
  • the MCS mapping stream for each stream applicable to the present invention may be defined as shown in the following table.
  • x (m) (m) means the nth bit of the spatial stream m
  • c (j) (i) means the ith output bit of the LDPC encoder j.
  • the spatial bit streams mapped to the 1,2,3,4,5,6,7,8th streams are x (0) , x (1) , x (2) , x ( 3) , x (4) , x (5) , x (6) and x (7) .
  • the mapping relationship is as follows.
  • the number of spatial streams among contents included in the EDMG Header-A may be used as common information for each channel during a channel combining operation. That is, the channels constituting the channel combination may all have the same stream number.
  • a number field of separate (additional) spatial streams may be further configured so that each channel-coupled channel may have an independent number of spatial streams.
  • FIG. 13 is a diagram briefly showing an EDMG A-PPDU format applicable to the present invention.
  • the EDMG A-PPDU format is composed of a sequence for a plurality of EDMG PPDUs and may not include the EDMG Header-B field shown in FIG. 10.
  • the EDMG Header-A field preceding each data field may include information on characteristics of a physical service data unit (PSDU) included in the data field.
  • PSDU physical service data unit
  • the transmission bandwidths of the EDMG Header-A field and the data field in the EDMG A-PPDU format may be the same.
  • data or signal information may be transmitted in different formats depending on whether the EDMG A-PPDU format is used.
  • the data or signal information may be transmitted in the following format.
  • whether the EDMG A-PPDU format is used may be implemented in a form indicating whether an additional PPDU format is present continuously in the EDMG Header-A field in time.
  • the A-PPDU format may be applied to a single user (SU) situation and may be applied to a single input single output (SISO) and multiple input multiple output (MIMO).
  • SU single user
  • SISO single input single output
  • MIMO multiple input multiple output
  • FIG. 14 is a diagram illustrating an A-PPDU format transmitted through a single channel and an A-PPDU format when transmitted through a channel bonding scheme according to a single carrier (SC) mode.
  • SC single carrier
  • the A-PPDU having a plurality of PPDUs connected thereto may be transmitted on a single channel.
  • L-STF, L-CEF, L-Header, EDMG Header-A, EDMG STF, EDMG CEF, and DATA fields corresponding to the first PPDU among the plurality of PPDUs may be included in the A-PPDU.
  • the first PPDU may correspond to Data 0 of FIG. 13 described above.
  • the EDMG Header-A and DATA fields corresponding to the second PPDU may be included in the A-PPDU, and the EDMG Header-A, DATA, AGC and TRN fields corresponding to the third PPDU may be included in the A-PPDU.
  • the AGC and TRN fields corresponding to the third PPDU may be omitted.
  • the EDMG Header-A field corresponding to the first PPDU, the second PPDU, and the third PPDU may be transmitted through a single carrier of a single channel.
  • an A-PPDU including three PPDUs consecutively included in the time dimension may be included.
  • the A-PPDU may include three or more PPDUs.
  • the added PPDU may be continuously located in the time dimension in the previous PPDU.
  • L-STF, L- of the first PPDU (eg, 1 st PPDU) in the A-PPDU
  • the CEF, L-Header and EDMG Header-A fields may be duplicated and transmitted for each channel.
  • the first PPDU (such as: 1 st PPDU) EDMG-STF field other PPDU leading from (for example: 2 nd PPDU, 3 rd PPDU, and so on) within EDMG Header-A field and a Data field for a bonded channel channel Can be sent through.
  • the EDMG Header-A field of the first PPDU in the A-PPDU is duplicated and transmitted for each channel in time order, and then the EDMG-STF field of the first PPDU.
  • the EDMG Header-A field and the Data field of the PPDU subsequent to the transmission may be transmitted by channel bonding.
  • the A-PPDU applicable to the present invention when transmitted in OFDM, the A-PPDU may be transmitted as follows.
  • FIG. 15 illustrates an A-PPDU format transmitted through a single channel and an A-PPDU format transmitted through a channel bonding scheme according to an orthogonal frequency division multiplexing (OFDM) mode.
  • OFDM orthogonal frequency division multiplexing
  • the A-PPDU having a plurality of PPDUs connected thereto may be transmitted on a single channel.
  • the L-STF, L-CEF, L-Header, EDMG Header-A, EDMG STF, EDMG CEF, and DATA fields corresponding to the first PPDU among the plurality of PPDUs may be included in the A-PPDU.
  • the EDMG Header-A field of the first PPDU may be transmitted in SC mode for a single channel.
  • the EDMG Header-A and DATA fields corresponding to the second PPDU may be included in the A-PPDU, and the EDMG Header-A, DATA, AGC and TRN fields corresponding to the third PPDU may be included in the A-PPDU.
  • the AGC and TRN fields corresponding to the third PPDU may be omitted.
  • the EDMG Header-A field corresponding to the second PPDU may be transmitted by applying an OFDM scheme to a single channel.
  • L-STF and L ⁇ of the first PPDU (eg, 1 st PPDU) in the A-PPDU.
  • the CEF, L-Header and EDMG Header-A fields may be duplicated and transmitted for each channel.
  • the first PPDU (such as: 1 st PPDU) EDMG-STF field other PPDU leading from (for example: 2 nd PPDU, 3 rd PPDU, and so on) within EDMG Header-A field and a Data field for a bonded channel channel Can be sent through.
  • the EDMG Header-A field corresponding to the first PPDU is transmitted in the SC scheme for a single channel, whereas the EDMG Header-A field corresponding to the second PPDU corresponds to the first PPDU.
  • the OFDM scheme may be applied to the bonded channel and transmitted.
  • the EDMG Header-A field of the second and subsequent PPDUs (eg, 2 nd PPDU, 3 rd PPDU, etc.) in the A-PPDU is the first if the entire A-PPDU is transmitted in the channel bonding format. Unlike the EDMG Header-A field of a PPDU (eg, 1 st PPDU), it may be transmitted through a bonded channel. Or, if the entire A-PPDU is transmitted in the OFDM scheme, the EDMG Header-A field of the second and subsequent PPDUs (eg, 2 nd PPDU, 3 rd PPDU, etc.) in the A-PPDU is transmitted in a single channel SC scheme. Unlike the EDMG Header-A field of the first PPDU (eg, 1 st PPDU), the OFDM scheme may be applied and transmitted.
  • the OFDM scheme may be applied and transmitted.
  • A-PPDU within a second PPDU there is a (for example, 2 nd PPDU) to be a new configuration method proposed for EDMG-A Header field after. Accordingly, the present invention proposes a method of configuring such an EDMG Header-A field.
  • FIG. 16 is a diagram briefly illustrating a method of configuring an EDMG Header-A field after a second PPDU in an A-PPDU when the A-PPDU is transmitted through a channel bonding transmission scheme in SC mode.
  • the EDMG Header-A field after the second PPDU in the A-PPDU applicable to the present invention may have a 112-bit size.
  • a total 128-bit field in which a 16-bit cyclic redundancy check (CRC) field is added to the EDMG Header-A field may be divided into two parts (eg, Part A and Part B), and LDPC for each part.
  • Encoding and mapping may be applied to configure the Binary Phase Shift Keying (BPSK) 448 symbols.
  • BPSK Binary Phase Shift Keying
  • each part may be repeated as much as N CB and configured as shown in the bottom configuration of FIG. 16.
  • the N CB is a value representing the number of channel bonded channels, and may have one of 2, 3, and 4 values.
  • FIG. 17 is a diagram briefly showing a method of configuring an EDMNG Header-A field after a second PPDU in an A-PPDU when the A-PPDU is transmitted in a channel bonding transmission scheme in an OFDM mode.
  • the overall configuration is similar to that of FIG. 16, but unlike FIG. 16, in FIG. 17, the parts may be configured of QPSK (Quadrature Phase Shift Keying) 336 symbols through LDPC encoding and mapping.
  • QPSK Quadrature Phase Shift Keying
  • IFFT inverse fast fourier transform
  • PAPR peak to average power ratio
  • the present invention proposes a method of rotating the phases of Part A and Part B repeatedly inserted according to the number of bonded channels in order to lower the PAPR.
  • the first OFDM symbol may be composed of [Part A, Part A * ], and the second OFDM symbol may be composed of [Part B, Par tB * ].
  • GI Guard Interval
  • each OFDM symbol is expressed as [GI, Part A, Part A * ], [GI, Part B, Part B * ].
  • * means a complex conjugate (complex conjugate).
  • a method of phase-rotating by pi pi accumulating the repeated parts instead of the complex conjugate may be applied.
  • a method of performing phase rotation by accumulating the repeated parts by pi / 2 may be applied without applying complex rotation or phase rotation by pi.
  • the first OFDM symbol may be composed of [Part A, Part A ⁇ e j ⁇ / 2 ] and the second OFDM symbol may be composed of [Part B, Part B ⁇ e j ⁇ / 2 ].
  • GI Guard Interval
  • the first OFDM symbol may be composed of [Part A, Part A * , Part A] and the second OFDM symbol may be composed of [art B, Part B * , Part B].
  • GI guard interval
  • each OFDM symbol is [GI, Part A, Part A * , Part A], [GI, Part B, Part B * , Part B].
  • a method of phase-rotating by pi pi accumulating the repeated parts instead of the complex conjugate may be applied.
  • the first OFDM symbol is composed of [Part A, Part A ⁇ e j ⁇ / 2 , Part A ⁇ e j ⁇ ], and the second OFDM symbol is [Part B, Part B ⁇ e j ⁇ / 2 , Part B ⁇ e j ⁇ ].
  • each OFDM symbol is [GI, Part A, Part A ⁇ e j ⁇ / 2 , Part A ⁇ e j ⁇ ], [GI, Part B, Part B ⁇ e j ⁇ / 2 , Part B ⁇ e j ⁇ ].
  • the repeated parts may be accumulated by 2 * pi / 3 to sequentially rotate the phases.
  • the first OFDM symbol consists of [Part A, Part A ⁇ e j2 ⁇ / 3 , Part A ⁇ e j4 ⁇ / 3 ]
  • the second OFDM symbol consists of [Part B, Part B ⁇ e j2 ⁇ / 3 , Part] B ⁇ e j4 ⁇ / 3 ].
  • each OFDM symbol is [GI, Part A, Part A ⁇ e j2 ⁇ / 3 , Part A ⁇ e j4 ⁇ / 3 ], [ GI, Part B, Part B ⁇ e j2 ⁇ / 3 , Part B ⁇ e j4 ⁇ / 3 ].
  • the first OFDM symbol is composed of [Part A, Part A * , Part A, Part A * ]
  • the second OFDM symbol is [Part B, Part B * , Part B, Part B * ].
  • GI guard interval
  • each OFDM symbol is [GI, Part A, Part A * , Part A, Part A * ], [GI, Part B, Part B * , Part B, Part B * ].
  • a method of phase-rotating by pi pi accumulating the repeated parts instead of the complex conjugate may be applied.
  • the first OFDM symbol is composed of [Part A, Part A ⁇ e j ⁇ / 2, Part A ⁇ e j ⁇ , Part A ⁇ e j3 ⁇ / 2]
  • the second OFDM symbol is [Part B, Part B ⁇ e j ⁇ / 2, may be of a Part B ⁇ e j ⁇ , Part B ⁇ e j3 ⁇ / 2].
  • each OFDM symbol is represented by [GI, Part A, Part A ⁇ e j ⁇ / 2 , Part A ⁇ e j ⁇ , Part A ⁇ e j3 ⁇ / 2], may be of a [GI, Part B, Part B ⁇ e j ⁇ / 2, Part B ⁇ e j ⁇ , Part B ⁇ e j3 ⁇ / 2]
  • the above-described method of configuring the EDMG Header-A field may be equally applied to the channel bonding transmission scheme in the SC mode.
  • the configuration of differently applying the phases of the repeated parts according to the above-described channel bonding may be equally applied to the SC transmission scheme.
  • a specific STA may transmit an A-PPDU in which a plurality of PPDUs are continuously included in a time dimension to another STA.
  • the A-PPDU may be transmitted through a channel in which a plurality of channels are bonded.
  • a method of transmitting the A-PPDU through a channel in which a plurality of channels are bonded in the OFDM mode will be described.
  • the specific STA transmits the first PPDU in chronological order among the PPDUs included in the A-PPDU.
  • the first PPDU may include an L-STF field, an L-CE field, an L-Header field, an EDMG header A field, an EDMG-STF field, an EDMG-CE field, and a data field.
  • the specific STA may transmit the L-STF field, the L-CE field, the L-Header field, and the EDMG header A field included in the first PPDU for each single channel.
  • the specific STA may transmit the EDMG-STF field, the EDMG-CE field, and the data field included in the first PPDU over a wide band through which the plurality of channels are bonded.
  • the EDMG header A field included in the first PPDU may be transmitted in a single carrier (SC) mode for a single channel.
  • SC single carrier
  • the specific STA continuously transmits the PPDUs excluding the first PPDU in time order among the PPDUs included in the A-PPDU.
  • the PPDUs except for the first PPDU in time order among the PPDUs included in the A-PPDU may include one EDMG header A field and one data field.
  • the one EDMG header A field may be located ahead of time in the one data field.
  • the EDMG Header-A field included in the PPDU other than the first PPDU may be transmitted in a broadband manner through a channel in which the plurality of channels are bonded.
  • the EDMG Header-A field included in the PPDU other than the first PPDU divides bit information for each EDMG header A field into two parts, and phases each part by the number of bonded channels according to a predetermined rule. It can be configured and transmitted in the form of two unit blocks generated by changing and repeatedly arranged.
  • the predetermined rule may mean that each part is repeatedly rotated by a predetermined size phase and repeatedly arranged as many as the number of bonded channels.
  • various values may be applied to the phase of the predetermined size. For example, values of ⁇ / 2, ⁇ / 3, 2 ⁇ / 3, ⁇ / 4, and the like may be applied as the phase value of the predetermined size.
  • the predetermined rule may mean that each part is repeatedly arranged as many as the number of bonded channels, and a value corresponding to the complex conjugate value of each part may be arranged evenly. Accordingly, when the particular part X is repeatedly arranged four times, it may be arranged in the form of [XX * XX * ].
  • 18 is a diagram for explaining an apparatus for implementing the method as described above.
  • the wireless device 100 of FIG. 18 may correspond to a station transmitting a signal including the A-PPDU described in the above description, and the wireless device 150 may correspond to a station receiving the signal including the A-PPDU described in the above description. have.
  • each station may correspond to an 11ay terminal or a PCP / AP.
  • a station transmitting a signal is called a transmitting device 100, and a station receiving a signal is called a receiving device 150.
  • the transmitter 100 may include a processor 110, a memory 120, and a transceiver 130
  • the receiver device 150 may include a processor 160, a memory 170, and a transceiver 180. can do.
  • the transceiver 130 and 180 may transmit / receive a radio signal and may be executed in a physical layer such as IEEE 802.11 / 3GPP.
  • the processors 110 and 160 are executed in the physical layer and / or the MAC layer and are connected to the transceivers 130 and 180.
  • the processors 110 and 160 and / or the transceivers 130 and 180 may include application-specific integrated circuits (ASICs), other chipsets, logic circuits, and / or data processors.
  • the memory 120, 170 may include read-only memory (ROM), random access memory (RAM), flash memory, memory card, storage medium and / or other storage unit.
  • ROM read-only memory
  • RAM random access memory
  • flash memory memory card
  • storage medium storage medium and / or other storage unit.
  • 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 memories 120 and 170 and may be executed by the processors 110 and 160.
  • the memories 120 and 170 may be disposed inside or outside the processes 110 and 160, and may be connected to the processes 110 and 160 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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Abstract

La présente concerne un procédé de transmission destiné à une station pour émettre-recevoir des signaux dans un système de réseau local sans fil (WLAN). Plus particulièrement, la présente invention concerne un procédé destiné à l'émission-réception de signaux par l'intermédiaire d'un canal dans lequel une pluralité de canaux sont liés, et un dispositif associé.
PCT/KR2017/009483 2016-08-30 2017-08-30 Procédé destiné à l'émission-réception de signaux dans un système de réseau local sans fil, et dispositif associé WO2018044066A1 (fr)

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CN115333908A (zh) * 2021-05-10 2022-11-11 苏州速通半导体科技有限公司 无线局域网中的发射器及由其执行的方法

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CN115333908A (zh) * 2021-05-10 2022-11-11 苏州速通半导体科技有限公司 无线局域网中的发射器及由其执行的方法
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