WO2021229776A1 - Terminal - Google Patents

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WO2021229776A1
WO2021229776A1 PCT/JP2020/019357 JP2020019357W WO2021229776A1 WO 2021229776 A1 WO2021229776 A1 WO 2021229776A1 JP 2020019357 W JP2020019357 W JP 2020019357W WO 2021229776 A1 WO2021229776 A1 WO 2021229776A1
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ftn
compression
time domain
length
index
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PCT/JP2020/019357
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English (en)
Japanese (ja)
Inventor
尚哉 芝池
浩樹 原田
聡 永田
ジェン リュー
ウェンジャ リュー
ギョウリン コウ
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株式会社Ｎｔｔドコモ
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Priority to JP2022522457A priority Critical patent/JPWO2021229776A1/ja
Priority to PCT/JP2020/019357 priority patent/WO2021229776A1/fr
Publication of WO2021229776A1 publication Critical patent/WO2021229776A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J1/00—Frequency-division multiplex systems

Definitions

  • the present disclosure relates to terminals that perform wireless communication, in particular, terminals that support time domain compression, such as Faster-Than-Nyquist (FTN) transmission.
  • TFN Faster-Than-Nyquist
  • the 3rd Generation Partnership Project (3GPP) specifies the 5th generation mobile communication system (also called 5G, New Radio (NR) or Next Generation (NG)), and next-generation specifications called Beyond 5G, 5G Evolution or 6G. We are also proceeding with the conversion.
  • 5G New Radio
  • NG Next Generation
  • the 3GPP Release 15 (NR) specification stipulates that a radio frame (10ms) is composed of multiple subframes (1ms) and that a slot is composed of 14 symbols (non-patented). Document 1).
  • FTN Faster-Than-Nyquist
  • SE frequency utilization efficiency
  • the FTN allows inter-symbol interference (ISI) and inter-subcarrier interference (ICI) to allow high density multiplexing of symbols and / or subcarriers. Improve frequency utilization efficiency.
  • ISI inter-symbol interference
  • ICI inter-subcarrier interference
  • Non-Patent Document 3 studies are underway on NR that supports up to 71 GHz, exceeding 52.6 GHz.
  • 5G Evolution or 6G aims to support frequency bands above 71GHz.
  • DFT-s-OFDM Discrete Fourier Transform-Spread Orthogonal Frequency Division Multiplexing
  • the optimum value of the compression rate (which may be called a compression coefficient) in the time domain by FTN may differ depending on the index to be optimized (for example, PAPR, throughput, etc.).
  • the following disclosure was made in view of such a situation, and aims to provide a terminal capable of setting an appropriate compression rate in a time domain according to an index to be optimized.
  • One aspect of the present disclosure is added to the symbol based on a transmit / receive unit (FTN modulation module and FTN demodulation module) that transmits / receives a slot composed of a plurality of symbols and the degree of compression of the symbol in the time domain. It is a terminal (UE200) equipped with a control unit that sets the length of the patrol prefix.
  • FTN modulation module and FTN demodulation module FTN demodulation module
  • One aspect of the present disclosure includes a transmission / reception unit (FTN modulation module and FTN demodulation module) that transmits / receives a slot composed of a plurality of symbols, and a control unit that sets a compression coefficient applied to the time domain of the symbol.
  • the control unit is a terminal (UE200) that sets the compression coefficient associated with each of a plurality of different indexes.
  • FIG. 1 is an overall schematic configuration diagram of the wireless communication system 10.
  • FIG. 2 is a diagram showing changes in the time domain in the combination of FTN and DFT-s-OFDM.
  • FIG. 3 is a diagram showing a configuration example of CP and OFDM symbols before and after FTN modulation (compression) in the time domain.
  • FIG. 4 is a schematic functional block configuration diagram of gNB100 and UE200.
  • FIG. 5 is a diagram showing a configuration example of a normal CP and OFDM symbol to which FTN is not applied in the time domain.
  • FIG. 6 is a diagram showing a basic configuration example of the CP and OFDM symbols according to the operation example 1-1.
  • FIG. 11B is a diagram showing a configuration example (No.
  • FIG. 12C is a diagram showing a configuration
  • FIG. 13 is a diagram showing an example of a combination of the target index, the MCS, and the compression coefficient ( ⁇ ) according to the operation example 2.
  • FIG. 14 is a diagram showing an example (MCS 0) of a table of compression coefficients ( ⁇ ) according to operation example 2-1.
  • FIG. 15 is a diagram showing an example (MCS 10) of a table of compression coefficients ( ⁇ ) according to operation example 2-1.
  • FIG. 16 is a diagram showing an example (MCS 28) of a table of compression coefficients ( ⁇ ) according to operation example 2-1.
  • FIG. 17 is a diagram showing an example (lossless securing) of a table of compression coefficients ( ⁇ ) according to operation example 2-2.
  • FIG. 18 is a diagram showing an example (PAPR optimization) of a table of compression coefficients ( ⁇ ) according to operation example 2-2.
  • FIG. 19 is a diagram showing an example (throughput optimization) of a table of compression coefficients ( ⁇ ) according to operation example 2-2.
  • FIG. 20 is a diagram showing an example of the hardware configuration of UE200.
  • FIG. 1 is an overall schematic configuration diagram of the wireless communication system 10 according to the present embodiment.
  • the wireless communication system 10 is a wireless communication system according to 5G New Radio (NR), and includes a Next Generation-Radio Access Network 20 (hereinafter, NG-RAN20, and a terminal 200 (hereinafter, UE200, User Equipment)).
  • NR 5G New Radio
  • NG-RAN20 Next Generation-Radio Access Network
  • UE200 User Equipment
  • NG-RAN20 includes a wireless base station 100 (hereinafter, gNB100).
  • gNB100 wireless base station 100
  • the specific configuration of the wireless communication system 10 including the number of gNBs and UEs is not limited to the example shown in FIG.
  • the NG-RAN20 actually contains multiple NG-RANNodes, specifically gNB (or ng-eNB), and is connected to a core network (5GC, not shown) according to 5G.
  • NG-RAN20 and 5GC may be simply expressed as "network”.
  • the gNB100 is a radio base station according to 5G, and executes wireless communication according to UE200 and 5G.
  • the gNB100 and UE200 bundle Massive MIMO (Multiple-Input Multiple-Output) and multiple component carriers (CC) that generate a beam with higher directivity by controlling radio signals transmitted from multiple antenna elements. It can support carrier aggregation (CA) and dual connectivity (DC) that communicates simultaneously between the UE and each of the two NG-RAN Nodes.
  • CA carrier aggregation
  • DC dual connectivity
  • the wireless communication system 10 corresponds to FR1 and FR2.
  • the frequency bands of each FR are as follows.
  • FR1 410 MHz to 7.125 GHz
  • FR2 24.25 GHz to 52.6 GHz
  • SCS Sub-Carrier Spacing
  • BW bandwidth
  • FR2 has a higher frequency than FR1 and SCS of 60, or 120kHz (240kHz may be included) is used, and a bandwidth (BW) of 50 to 400MHz may be used.
  • SCS may be interpreted as numerology. Numerology is defined in 3GPP TS38.300 and corresponds to one subcarrier spacing in the frequency domain.
  • the wireless communication system 10 can support a higher frequency band than the frequency band of FR2. Specifically, the wireless communication system 10 may support a frequency band exceeding 52.6 GHz and up to 114.25 GHz.
  • the high frequency band may be further divided. For example, it may be divided into a frequency range of 71 GHz or less and a frequency range of more than 71 GHz.
  • a narrower beam that is, a larger number of beams
  • larger (wider) SCS (and / or fewer FFT points), PAPR reduction mechanisms, or single carrier waveforms may be required to be more sensitive to PAPR and power amplifier non-linearity.
  • a larger SCS for example, 480kHz, 960kHz
  • DFT-s-OFDM Discrete Fourier Transform-Spread Orthogonal Frequency Division Multiplexing
  • the wireless communication system 10 can support Faster-Than-Nyquist (FTN) transmission.
  • FTN can improve frequency utilization efficiency compared to Nyquist straight transmission by multiplexing symbols (specifically, OFDM symbols, optionally abbreviated as symbols) at a faster rate than Nyquist straight. ..
  • FTN may be applied to only one of the uplink (UL) and downlink (DL), but does not exclude FTN to both UL and DL.
  • FTN allows inter-symbol interference (ISI) and inter-subcarrier interference (ICI), and can improve frequency utilization efficiency by multiplexing OFDM symbols at high density.
  • the frequency utilization efficiency may be simply referred to as utilization efficiency, or may be referred to as spectral efficiency (SE) or the like.
  • FIG. 2 shows the change in the time domain in the combination of FTN and DFT-s-OFDM.
  • Non-orthogonal subcarriers can be expressed as follows.
  • ⁇ is called an FTN modulation coefficient or a compression coefficient.
  • the compression coefficient may mean the compression rate in the time domain by FTN, and may be simply called the compression rate or the like. Further, the compression coefficient does not necessarily mean the compression rate in the time domain by FTN, and may be a coefficient related to other methods other than FTN.
  • the waveform of the non-orthogonal subcarrier as described above may be called a non-orthogonal waveform (Non-Orthogonal Waveform (NOW)).
  • the symbol length of the OFDM symbol is scaled by the FTN modulation coefficient ⁇ after FTN modulation.
  • ⁇ may be called a Squeezing factor (aperture coefficient) or the like.
  • the symbol length is shorter than before FTN modulation, that is, the OFDM symbol is compressed in the time domain as compared with before FTN modulation.
  • the degree of compression can be controlled by ⁇ .
  • the time domain may be referred to as the time direction, and the symbol length may be referred to as the symbol time length, symbol length, symbol period, symbol time, or the like.
  • FTN FTN modulation
  • NOW non-orthogonal waveform
  • the length of the cyclic prefix (CP) is preferably set based on the compression factor ( ⁇ ) applied in the NOW time domain. It is also desirable that low complexity Mini-Mean-Square Error (MMSE)-ICI cancellation FDE (Frequency Domain Equalization) be supported to cancel intersymbol interference (ISI) and inter-subcarrier interference (ICI).
  • MMSE Mini-Mean-Square Error
  • MMSE Mini-Mean-Square Error
  • ICI cancellation FDE Frequency Domain Equalization
  • FIG. 3 shows a configuration example of CP and OFDM symbols before and after FTN modulation (compression) in the time domain. Specifically, FIG. 3 shows the OFDM symbol shown in FIG. 2 in more detail.
  • the CP length (N_CP ⁇ ⁇ ) based on the compression coefficient ⁇ can be expressed as follows.
  • CP length from the relationship between the symbol time (T U), may be expressed as T CP.
  • T U and T CP may be represented by units of time (e.g., mu sec).
  • the symbol length including CP before compression of the time domain by FTN can be expressed as follows.
  • symbol length including CP after compression of the time domain by FTN can be expressed as follows.
  • FIG. 4 is a schematic functional block configuration diagram of gNB100 and UE200. Since the gNB100 and UE200 have the same schematic functional block configuration, the functional block of UE200 will be described below as an example.
  • DFT-s-OFDM (applicable to both downlink (DL) and uplink (UL)) and FTN are applicable.
  • a limited number of RF chains can reduce SE, but FTN can improve SE by using compressed (squeezed) waveforms in the time domain.
  • FIG. 4 mainly shows the parts related to FTN and DFT-s-OFDM.
  • the related functional blocks are shown separately for the transmission (TX) side and the reception (RX) side.
  • the non-orthogonal waveform may be interpreted as being generated by the combination of DFT-s-OFDM and FTN in the time domain.
  • DFT-s-OFDM Since DFT-s-OFDM is used on the transmitting side, DFT precoding (diffusion) is applied after modulation by the selected modulation method, and subcarrier mapping is executed on the symbol.
  • the subcarrier is a sine wave having a different carrier frequency, and the phase and amplitude of each subcarrier are set according to the type of the symbol to be transmitted.
  • the application of FTN is considered and intensive mapping to low frequency subcarriers is performed.
  • IFFT inverse fast Fourier transform
  • CP cyclic prefix
  • an FTN modulation module (time domain compression module) is provided after CP addition, that is, after DFT-s-OFDM.
  • the FTN modulation module multiplexes OFDM symbols at a faster rate than the Nyquist rate according to the FTN. Specifically, the FTN modulation module has upsampling and a waveform shaping function after the sampling.
  • the receiving side executes the reverse processing of the above-mentioned transmitting side.
  • a frequency region equalization (FDE) function (MMSE-ICI cleavagelation FDE) based on the minimum mean square error (MMSE) norm is implemented.
  • FDE frequency region equalization
  • MMSE-ICI cleavagelation FDE MMSE-ICI cleavagelation FDE
  • MMSE minimum mean square error
  • equalization of the frequency domain based on the MMSE norm is executed, and the BER (Bit Error Rate) characteristic can be improved.
  • the combination of DFT-s-OFDM with FDE and FTN with FDE can improve SE over DFT-s-OFDM alone, at the expense of a modest increase in signal-to-noise ratio (SNR). ..
  • the combination of DFT-s-OFDM and FTN using FDE can achieve the same BER and SE performance as when CP-OFDM is used.
  • an FTN demodulation module (time domain extension module) is provided before CP removal.
  • the FTN demodulation module has a matched filter (matched filter) and a downsampling function.
  • the FTN modulation module and the FTN demodulation module transmit and receive a slot composed of a plurality of symbols (specifically, an OFDM symbol or an FTN symbol because it is after FTN).
  • the FTN modulation module and the FTN demodulation module constitute a transmission / reception unit.
  • the slot is a range (period) in the time direction (which may be called a time domain) included in the wireless frame.
  • 14 symbols / slots are supported, but slots containing symbols that are integral multiples of 14 symbols may also be supported.
  • the FTN modulation module and the FTN demodulation module may send and receive a plurality of types of radio frames having different slot patterns.
  • a different slot pattern may mean that at least one of the number of UL symbols, DL symbols and flexible symbols, symbol length, slot boundaries or symbol boundaries contained in the radio frame is different.
  • the control unit shown in FIG. 4 controls each functional block constituting the transmitting side and the receiving side of the UE 200.
  • the control unit can set the length of the cyclic prefix (CP) added to the symbol based on the degree of compression in the time domain of the symbol (OFDM symbol).
  • CP cyclic prefix
  • control unit can set the length of the CP based on the compression coefficient ⁇ applied to the time-domain. In other words, the control unit can set the compression ratio applied to the time domain of the symbol (OFDM symbol).
  • ⁇ is a value indicating the compression rate in the time domain, and basically, a value of 1.0 or less may be taken.
  • ⁇ 1.0
  • the time domain of the OFDM symbol (including CP) is not compressed.
  • the value of ⁇ may be indicated by the reciprocal of such a value, a fraction, or the like.
  • the control unit may increase the length of CP as the compression coefficient ( ⁇ ) becomes smaller.
  • control unit may set the length of the CP associated with the minimum compression coefficient ( ⁇ min). Specifically, the control unit may set the CP length associated with the minimum ⁇ (for example, 0.5) even when a plurality of values in which ⁇ is less than 1.0 are taken.
  • the control unit can also set a compression coefficient associated with each of a plurality of different indexes.
  • a plurality of different indicators may be interpreted as an indicator of target quality. Specific examples include lossless assurance, PAPR optimization or throughput optimization. Appropriate ⁇ values may vary depending on the target quality index.
  • the control unit can set the value of ⁇ according to the target index. For example, when the control unit targets the lossless securing, the control unit can set the value of ⁇ associated with the lossless securing. Similarly, when targeting PAPR optimization, the control unit can set the value of ⁇ associated with PAPR optimization, and when targeting throughput optimization, it is associated with throughput optimization. The value of ⁇ can be set.
  • control unit may set the compression coefficient according to the Modulation and Coding Scheme (MCS). That is, the control unit can set the value of ⁇ according to at least one of the modulation method and the coding rate for each target index.
  • MCS Modulation and Coding Scheme
  • control unit can set the value of ⁇ associated with the MCSIndex.
  • the MCSIndex is specified in Chapter 5.1.3 of 3GPP TS38.214. MCSIndex can take a value from 0 to 28. Modulation Order (Qm, modulation method) and Code Rate (coding rate) are defined by the value of MCSIndex.
  • control unit can set the value of ⁇ associated with MCSIndex 0, 10, 28.
  • value of ⁇ associated with each MCSIndex may be one or a plurality. An example of the value of ⁇ associated with the MCSIndex will be described later.
  • control unit may set the compression coefficient based on the correspondence between the index and the compression coefficient.
  • the association may be defined for each target index (lossless assurance, PAPR optimization or throughput optimization).
  • control unit may determine the value of ⁇ based on a table in which an arbitrary index and the value of ⁇ are associated with each other.
  • the table may be configured for each target index.
  • the index may take a value from 0 to 28 in the same way as the MCS Index. That is, the existing MCSIndex table (3GPP TS38.214, Chapter 5.1.3) may be used to construct a table in which an arbitrary index is associated with the value of ⁇ .
  • control unit may set the value of ⁇ , that is, the compression coefficient, based on the signaling in the upper layer from the network.
  • control unit can set the value of ⁇ based on the signaling in the radio resource control layer (RRC). More specifically, RRC parameters (which may be interpreted as information elements (IE)) that are common to each target index or to a plurality of indexes may be used. An example of the parameter will be described later.
  • RRC parameters which may be interpreted as information elements (IE)
  • IE information elements
  • the UE200 supports processing related to specified reference signals, control signals, control channels, and data channels in order to execute wireless communication in accordance with NR.
  • the UE200 executes processing using a reference signal (RS) such as Demodulation reference signal (DMRS) and Phase Tracking Reference Signal (PTRS).
  • RS reference signal
  • DMRS Demodulation reference signal
  • PTRS Phase Tracking Reference Signal
  • DMRS is a reference signal (pilot signal) known between the base station and the terminal of each terminal for estimating the fading channel used for data demodulation.
  • the PTRS is a terminal-specific reference signal for the purpose of estimating phase noise, which is a problem in high frequency bands.
  • the reference signal also includes Channel State Information-Reference Signal (CSI-RS) and Sounding Reference Signal (SRS).
  • CSI-RS Channel State Information-Reference Signal
  • SRS Sounding Reference Signal
  • UE200 sends and receives control signals such as RRC via the control channel.
  • the Channels include control channels and data channels.
  • the control channel includes PDCCH (Physical Downlink Control Channel), PUCCH (Physical Uplink Control Channel), PRACH (Physical Random Access Channel), PBCH (Physical Broadcast Channel) and the like.
  • the data channels include PDSCH (Physical Downlink Shared Channel) and PUSCH (Physical Downlink Shared Channel).
  • Data may mean data transmitted over a data channel.
  • UE200 executes transmission / reception of Protocol Data Unit (PDU) and Service Data Unit (SDU).
  • PDU Protocol Data Unit
  • SDU Service Data Unit
  • the UE200 is capable of assembling PDUs / SDUs at multiple layers (such as the Medium Access Control Layer (MAC), Radio Link Control Layer (RLC), and Packet Data Convergence Protocol Layer (PDCP)). Perform disassembly and so on.
  • MAC Medium Access Control Layer
  • RLC Radio Link Control Layer
  • PDCP Packet Data Convergence Protocol Layer
  • gNB100 and UE200 perform compression in the time domain of the OFDM symbol by FTN, and set the CP length based on the degree of compression, and the target quality index (lossless assurance, PAPR).
  • the operation of setting the compression coefficient ( ⁇ ) associated with (optimization or throughput optimization) will be described.
  • NOW non-orthogonal waveform
  • the CP length be set based on the parameters related to NOW, specifically the compression factor ( ⁇ ).
  • the compression coefficient ( ⁇ ) is set according to the target different quality index.
  • FIG. 5 shows a configuration example of normal CP and OFDM symbols to which FTN is not applied in the time domain.
  • CP is used to eliminate ISI caused by multipath delays.
  • the CP length is determined based on the FFT size, SCS and index of the OFDM symbol.
  • Extended CP is only supported on 60kHz SCS.
  • the CP length can be expressed as follows.
  • the "I" in N_CP, I ⁇ ⁇ means the index of the OFDM symbol (OFDM symbol index).
  • l can take a value from 0 to 27.
  • 3GPP Release-15, 16 is premised on the use of orthogonal waveforms, and NOW is not supported.
  • the CP length setting operation based on the compression rate in the time domain of the OFDM symbol (which may be read as a slot) and the compression coefficient ( ⁇ ) setting operation according to the target different quality index will be described.
  • Operation example 1 relates to setting the CP length based on the compression rate in the time domain of the OFDM symbol while using NOW.
  • the operation example 2 relates to the setting of the compression coefficient ( ⁇ ) according to the target different quality index.
  • the operation example 1 and the operation example 2 are configured as follows.
  • the CP length is set based on the compression coefficient ( ⁇ ) as well as the FFT size, SCS and (time domain) OFDM symbol index.
  • the CP length is set based on the compression coefficient ( ⁇ ) as well as the FFT size, SCS and (time domain) OFDM symbol index.
  • ⁇ 1, there may be an option of whether or not to consider the influence of the pulse shaping filter in the setting of the CP length.
  • CP length setting considering the influence of the pulse shaping filter can be calculated as follows.
  • CP length setting without considering the influence of the pulse shaping filter can be calculated as follows.
  • FIG. 6 shows a basic configuration example of the CP and OFDM symbols according to the operation example 1-1. Further, in this operation example, the CP length can be expressed as follows.
  • 5G Evolution or 6G may support larger SCS, so larger SCS ( ⁇ ) may be provided.
  • SCS ⁇ f 30kHz
  • FFT size N_f 2048
  • L 10 truncated from both sides before and after the pulse shaping filter of NOW.
  • the CP length is different between option 1 and option 2. Specifically, the CP length of option 1 is longer than the CP length of option 2.
  • the SCS, FFT size, and the like have the same conditions as the configuration examples shown in FIGS. 7 and 8.
  • the CP length is set by implicit or explicit notification.
  • the CP length may be implicitly set according to the compression coefficient ( ⁇ ) (operation example 1-2-1).
  • ⁇ may be a fixed value predetermined in the 3GPP specification, or may be set using RRC or downlink control information (DCI).
  • the CP length may be explicitly set using RRC (operation example 1-2-2).
  • RRC operation example 1-2-2-2
  • the following options may be set.
  • CP length is set using RRC based on the minimum compression factor ⁇ min.
  • a new RRC parameter information element (IE) or even in the fields that make up IE).
  • Good for example, NOW-minCompressionFactor may be introduced.
  • only one ⁇ min may be set, or a plurality of ⁇ min may be set. If only one ⁇ min is set, all ⁇ may belong to the same set.
  • ⁇ mins corresponding to each set may be set.
  • ⁇ mins corresponding to that set may be used.
  • CP length is set using RRC based on the compression factor ⁇
  • a new RRC parameter (which may be an information element (IE) or a field that constitutes IE), to indicate ⁇ , For example, NOW-Compression Factor may be introduced.
  • FIGS. 11A, 11B and 11C show a configuration example (No. 1) of the CP and OFDM symbols according to the operation example 1-2-2.
  • 11A, 11B and 11C correspond to the above-mentioned option 1 and show a configuration example in the case where only one ⁇ min is set.
  • FIGS. 12A, 12B and 12C show configuration examples (No. 2) of CP and OFDM symbols according to Operation Example 1-2-2.
  • FIGS. 12A, 12B and 12C also correspond to the above-mentioned option 1 and show a configuration example when a plurality of ⁇ mins are set.
  • the SCS, FFT size, and the like have the same conditions as the configuration examples shown in FIGS. 7 and 8.
  • the compression coefficient ( ⁇ ) is set according to the target different quality index. Specifically, as described above, ⁇ is set according to the index of lossless securing, PAPR optimization, or throughput optimization.
  • lossless securing may be interpreted as trying to compress the time domain while preventing a portion cut by the pulse shaping filter (pulse shaping filter) from occurring.
  • PAPR optimization may be interpreted as aiming at reduction of PAPR.
  • Throughput optimization can be interpreted as improving throughput (transmission speed) by setting a smaller ⁇ while ensuring low BER.
  • FIG. 13 shows an example of a combination of the target index, the MCS, and the compression coefficient ( ⁇ ) according to the operation example 2. As shown in FIG. 13, the calculation method of ⁇ may differ depending on the target quality index.
  • the calculation method of ⁇ may differ depending on the level of MCS, specifically, the modulation method (QPSK, 16QAM, 64QAM) and / or Code Rate (CR).
  • the modulation method QPSK, 16QAM, 64QAM
  • CR Code Rate
  • FIGS. 14, 15 and 16 show an example of a table of compression coefficients ( ⁇ ) according to operation example 2-1. Specifically, the tables shown in FIGS. 14, 15 and 16 correspond to MCS 0, 10, 28 (MCS Index), respectively.
  • a table associated with the MCSIndex and defining a plurality of different ⁇ values may be used. Further, different values of ⁇ may be set according to the index of lossless securing, PAPR optimization, or throughput optimization according to the MCS. Further, a value of ⁇ other than that for the index (0.9, 0.8, 0.75, etc.) may be set.
  • a new field for example, Compression Factor scaling
  • DCI Data Interference Factor
  • FIGS. 17, 18 and 19 show an example of a table of compression coefficients ( ⁇ ) according to operation example 2-2. Specifically, the tables shown in FIGS. 17, 18 and 19 correspond to lossless assurance, PAPR optimization or throughput optimization, respectively.
  • a table associated with the target index and defining a plurality of different ⁇ values may be used.
  • a new field for example, CompressionFactorLosslessscaling, CompressionFactorPaprscaling, CompressionFactorThroughputscaling
  • DCI CompressionFactorLosslessscaling, CompressionFactorPaprscaling, CompressionFactorThroughputscaling
  • UE200 may assume a default value (for example, 1).
  • UE200 may assume a default value (for example, 1).
  • the UE 200 can set the length of the cyclic prefix (CP) attached to a symbol (OFDM symbol) based on the degree of compression in the time domain.
  • CP cyclic prefix
  • OFDM symbol symbol
  • an appropriate CP can be set according to the degree of compression.
  • the UE 200 can set the CP length based on the compression coefficient ⁇ applied to the time domain. Therefore, an appropriate CP length can be quickly and easily set according to the compression rate in the time domain by FTN or the like.
  • the UE200 can lengthen the CP as the compression coefficient ( ⁇ ) becomes smaller. Therefore, stable symbol reception can be continued even when the compression rate in the time domain is high.
  • the UE 200 can set the CP length associated with the minimum compression coefficient ( ⁇ min). Therefore, even when a plurality of ⁇ s are used, the reception of the symbol can be continued more reliably.
  • the UE200 can also set a compression factor associated with each of a plurality of different target indicators (lossless assurance, PAPR optimization or throughput optimization).
  • the UE 200 can set the value of ⁇ according to at least one of the modulation method and the coding rate for each target index. Therefore, an appropriate compression coefficient ( ⁇ ) can be set according to the combination of the target index and the MCS.
  • the UE 200 when setting the value of ⁇ corresponding to such an index, sets the compression coefficient based on the correspondence between an arbitrary index or an index similar to the MCS Index and the compression coefficient. can. Therefore, for example, the compression coefficient can be flexibly set while following the same configuration as the MCS Index.
  • the UE 200 when setting the value of ⁇ according to the index, the UE 200 sets the value of ⁇ , that is, the compression coefficient, based on the signaling in the upper layer (RRC or the like) from the network. be able to. Therefore, an appropriate value of ⁇ can be set by network initiative.
  • the compression coefficient in the time domain changes depending on the FTN
  • the compression coefficient in such a time domain does not necessarily have to be based on the FTN. That is, regardless of the modulation method such as FTN, the compression coefficient (compression rate) in the time domain may be simply specified.
  • each functional block is realized by any combination of at least one of hardware and software.
  • the method of realizing each functional block is not particularly limited. That is, each functional block may be realized using one physically or logically coupled device, or two or more physically or logically separated devices can be directly or indirectly (eg, for example). , Wired, wireless, etc.) and may be realized using these plurality of devices.
  • the functional block may be realized by combining the software with the one device or the plurality of devices.
  • Functions include judgment, decision, judgment, calculation, calculation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, solution, selection, selection, establishment, comparison, assumption, expectation, and assumption. Broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, etc., but limited to these I can't.
  • a functional block (configuration unit) that makes transmission function is called a transmitting unit (transmitting unit) or a transmitter (transmitter).
  • the realization method is not particularly limited.
  • FIG. 20 is a diagram showing an example of the hardware configuration of UE200.
  • the UE 200 may be configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like.
  • the word “device” can be read as a circuit, device, unit, etc.
  • the hardware configuration of the device may be configured to include one or more of the devices shown in the figure, or may be configured not to include some of the devices.
  • Each functional block of UE200 (see FIG. 4) is realized by any hardware element of the computer device or a combination of the hardware elements.
  • each function in the UE200 is such that the processor 1001 performs an operation by loading predetermined software (program) on the hardware such as the processor 1001 and the memory 1002, and controls the communication by the communication device 1004, or the memory 1002. And by controlling at least one of reading and writing of data in the storage 1003.
  • predetermined software program
  • Processor 1001 operates, for example, an operating system to control the entire computer.
  • the processor 1001 may be configured by a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic unit, a register, and the like.
  • CPU central processing unit
  • the processor 1001 reads a program (program code), a software module, data, etc. from at least one of the storage 1003 and the communication device 1004 into the memory 1002, and executes various processes according to these.
  • a program program code
  • a program that causes a computer to execute at least a part of the operations described in the above-described embodiment is used.
  • the various processes described above may be executed by one processor 1001 or may be executed simultaneously or sequentially by two or more processors 1001.
  • Processor 1001 may be implemented by one or more chips.
  • the program may be transmitted from the network via a telecommunication line.
  • the memory 1002 is a computer-readable recording medium, and is composed of at least one such as ReadOnlyMemory (ROM), ErasableProgrammableROM (EPROM), Electrically ErasableProgrammableROM (EEPROM), and RandomAccessMemory (RAM). May be done.
  • the memory 1002 may be referred to as a register, a cache, a main memory (main storage device), or the like.
  • the memory 1002 can store a program (program code), a software module, or the like that can execute the method according to the embodiment of the present disclosure.
  • the storage 1003 is a computer-readable recording medium, for example, an optical disk such as Compact Disc ROM (CD-ROM), a hard disk drive, a flexible disk, an optical magnetic disk (for example, a compact disk, a digital versatile disk, or a Blu-ray). It may consist of at least one (registered trademark) disk), smart card, flash memory (eg, card, stick, key drive), floppy (registered trademark) disk, magnetic strip, and the like.
  • Storage 1003 may be referred to as auxiliary storage.
  • the recording medium described above may be, for example, a database, server or other suitable medium containing at least one of memory 1002 and storage 1003.
  • the communication device 1004 is hardware (transmission / reception device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as, for example, a network device, a network controller, a network card, a communication module, or the like.
  • the communication device 1004 includes, for example, a high frequency switch, a duplexer, a filter, a frequency synthesizer, etc. in order to realize at least one of frequency division duplex (FDD) and time division duplex (TDD). It may be composed of.
  • FDD frequency division duplex
  • TDD time division duplex
  • the input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that accepts an input from the outside.
  • the output device 1006 is an output device (for example, a display, a speaker, an LED lamp, etc.) that outputs to the outside.
  • the input device 1005 and the output device 1006 may have an integrated configuration (for example, a touch panel).
  • Bus 1007 may be configured using a single bus or may be configured using different buses for each device.
  • the device includes hardware such as a microprocessor, a digital signal processor (Digital Signal Processor: DSP), ApplicationSpecific IntegratedCircuit (ASIC), ProgrammableLogicDevice (PLD), and FieldProgrammableGateArray (FPGA).
  • the hardware may implement some or all of each functional block.
  • processor 1001 may be implemented using at least one of these hardware.
  • information notification includes physical layer signaling (eg Downlink Control Information (DCI), Uplink Control Information (UCI), higher layer signaling (eg RRC signaling, Medium Access Control (MAC) signaling, broadcast information (Master Information Block)). (MIB), System Information Block (SIB)), other signals or combinations thereof.
  • DCI Downlink Control Information
  • UCI Uplink Control Information
  • RRC signaling eg RRC signaling, Medium Access Control (MAC) signaling, broadcast information (Master Information Block)).
  • MIB System Information Block
  • SIB System Information Block
  • RRC signaling may also be referred to as an RRC message, eg, RRC Connection Setup. ) Message, RRC Connection Reconfiguration message, etc. may be used.
  • LTE LongTermEvolution
  • LTE-A LTE-Advanced
  • SUPER3G IMT-Advanced
  • 4G 4th generation mobile communication system
  • 5G 5th generation mobile communication system
  • FutureRadioAccess FAA
  • NewRadio NR
  • W-CDMA registered trademark
  • GSM registered trademark
  • CDMA2000 Code Division Multiple Access 2000
  • UMB UltraMobile Broadband
  • IEEE802.11 Wi-Fi (registered trademark)
  • IEEE802.16 WiMAX®
  • IEEE802.20 Ultra-WideBand (UWB), Bluetooth®, and other systems that utilize appropriate systems and at least one of the next-generation systems extended based on them.
  • a plurality of systems may be applied in combination (for example, a combination of at least one of LTE and LTE-A and 5G).
  • the specific operation performed by the base station in this disclosure may be performed by its upper node (upper node).
  • various operations performed for communication with the terminal are the base station and other network nodes other than the base station (eg, MME or). It is clear that it can be done by at least one of (but not limited to, S-GW, etc.).
  • S-GW network node
  • the case where there is one network node other than the base station is illustrated above, it may be a combination of a plurality of other network nodes (for example, MME and S-GW).
  • Information and signals can be output from the upper layer (or lower layer) to the lower layer (or upper layer).
  • Input / output may be performed via a plurality of network nodes.
  • the input / output information may be stored in a specific location (for example, memory) or may be managed using a management table.
  • the input / output information may be overwritten, updated, or added.
  • the output information may be deleted.
  • the input information may be transmitted to another device.
  • the determination may be made by a value represented by 1 bit (0 or 1), by a boolean value (Boolean: true or false), or by comparing numerical values (for example, a predetermined value). It may be done by comparison with the value).
  • the notification of predetermined information (for example, the notification of "being X") is not limited to the explicit one, but is performed implicitly (for example, the notification of the predetermined information is not performed). May be good.
  • Software whether referred to as software, firmware, middleware, microcode, hardware description language, or other names, is an instruction, instruction set, code, code segment, program code, program, subprogram, software module.
  • Applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, features, etc. should be broadly interpreted.
  • software, instructions, information, etc. may be transmitted and received via a transmission medium.
  • a transmission medium For example, a website, where the software uses at least one of wired technology (coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), etc.) and wireless technology (infrared, microwave, etc.).
  • wired technology coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), etc.
  • wireless technology infrared, microwave, etc.
  • the information, signals, etc. described in this disclosure may be represented using any of a variety of different techniques.
  • data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description are voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any of these. It may be represented by a combination of.
  • a channel and a symbol may be a signal (signaling).
  • the signal may be a message.
  • the component carrier (CC) may be referred to as a carrier frequency, a cell, a frequency carrier, or the like.
  • system and “network” used in this disclosure are used interchangeably.
  • the information, parameters, etc. described in the present disclosure may be expressed using an absolute value, a relative value from a predetermined value, or another corresponding information. It may be represented.
  • the radio resource may be one indicated by an index.
  • Base Station BS
  • Wireless Base Station Wireless Base Station
  • Fixed Station NodeB
  • eNodeB eNodeB
  • gNodeB gNodeB
  • Access point "transmission point”
  • reception point "transmission / reception point”
  • cell “sector”
  • Cell group “cell group”
  • Terms such as “carrier” and “component carrier” may be used interchangeably.
  • Base stations are sometimes referred to by terms such as macrocells, small cells, femtocells, and picocells.
  • a base station can accommodate one or more (eg, three) cells (also called sectors). When a base station accommodates multiple cells, the entire base station coverage area can be divided into multiple smaller areas, each smaller area being a base station subsystem (eg, a remote radio for indoor use). Communication services can also be provided by Head: RRH).
  • RRH Remote Radio Head
  • cell refers to a part or all of the coverage area of at least one of the base station providing communication services in this coverage and the base station subsystem.
  • MS Mobile Station
  • UE user equipment
  • terminal terminal
  • Mobile stations can be used by those skilled in the art as subscriber stations, mobile units, subscriber units, wireless units, remote units, mobile devices, wireless devices, wireless communication devices, remote devices, mobile subscriber stations, access terminals, mobile terminals, wireless. It may also be referred to as a terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable term.
  • At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a communication device, or the like.
  • At least one of the base station and the mobile station may be a device mounted on the mobile body, a mobile body itself, or the like.
  • the moving body may be a vehicle (eg, car, airplane, etc.), an unmanned moving body (eg, drone, self-driving car, etc.), or a robot (manned or unmanned). ) May be.
  • at least one of the base station and the mobile station includes a device that does not necessarily move during communication operation.
  • at least one of a base station and a mobile station may be an Internet of Things (IoT) device such as a sensor.
  • IoT Internet of Things
  • the base station in the present disclosure may be read as a mobile station (user terminal, the same shall apply hereinafter).
  • communication between a base station and a mobile station has been replaced with communication between a plurality of mobile stations (for example, it may be called Device-to-Device (D2D), Vehicle-to-Everything (V2X), etc.).
  • D2D Device-to-Device
  • V2X Vehicle-to-Everything
  • Each aspect / embodiment of the present disclosure may be applied to the configuration.
  • the mobile station may have the functions of the base station.
  • words such as "up” and “down” may be read as words corresponding to communication between terminals (for example, "side”).
  • the upstream channel, the downstream channel, and the like may be read as a side channel.
  • the mobile station in the present disclosure may be read as a base station.
  • the base station may have the functions of the mobile station.
  • the radio frame may be composed of one or more frames in the time domain. Each one or more frames in the time domain may be referred to as a subframe. Subframes may further be composed of one or more slots in the time domain.
  • the subframe may have a fixed time length (eg, 1 ms) that does not depend on numerology.
  • the numerology may be a communication parameter that applies to at least one of the transmission and reception of a signal or channel.
  • Numerology includes, for example, SubCarrier Spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (Transmission Time Interval: TTI), number of symbols per TTI, radio frame configuration, transmission / reception. It may indicate at least one of a specific filtering process performed by the machine in the frequency domain, a specific windowing process performed by the transceiver in the time domain, and the like.
  • the slot may be composed of one or more symbols (Orthogonal Frequency Division Multiplexing (OFDM) symbol, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol, etc.) in the time domain.
  • the slot may be a unit of time based on numerology.
  • the slot may include a plurality of mini slots. Each minislot may be composed of one or more symbols in the time domain. Further, the mini slot may be referred to as a sub slot. The minislot may consist of a smaller number of symbols than the slot.
  • PDSCH (or PUSCH) transmitted in time units larger than the minislot may be referred to as PDSCH (or PUSCH) mapping type A.
  • the PDSCH (or PUSCH) transmitted using the minislot may be referred to as PDSCH (or PUSCH) mapping type B.
  • the wireless frame, subframe, slot, minislot and symbol all represent the time unit when transmitting a signal.
  • the radio frame, subframe, slot, minislot and symbol may use different names corresponding to each.
  • one subframe may be referred to as a transmission time interval (TTI)
  • TTI transmission time interval
  • TTI transmission time interval
  • TTI transmission time interval
  • TTI transmission time interval
  • TTI transmission time interval
  • TTI slot or one minislot
  • at least one of the subframe and TTI may be a subframe (1ms) in existing LTE, a period shorter than 1ms (eg, 1-13 symbols), or a period longer than 1ms. May be.
  • the unit representing TTI may be called a slot, a mini slot, or the like instead of a subframe.
  • TTI refers to, for example, the minimum time unit of scheduling in wireless communication.
  • a base station schedules each user terminal to allocate wireless resources (frequency bandwidth that can be used in each user terminal, transmission power, etc.) in TTI units.
  • the definition of TTI is not limited to this.
  • TTI may be a transmission time unit such as a channel-encoded data packet (transport block), a code block, or a code word, or may be a processing unit such as scheduling or link adaptation.
  • the time interval for example, the number of symbols
  • the transport block, code block, code word, etc. may be shorter than the TTI.
  • one or more TTIs may be the minimum time unit for scheduling. Further, the number of slots (number of mini-slots) constituting the minimum time unit of the scheduling may be controlled.
  • TTI with a time length of 1 ms may be called normal TTI (TTI in LTE Rel.8-12), normal TTI, long TTI, normal subframe, normal subframe, long subframe, slot, etc.
  • a TTI shorter than a normal TTI may be referred to as a shortened TTI, a short TTI, a partial TTI (partial or fractional TTI), a shortened subframe, a short subframe, a minislot, a subslot, a slot, and the like.
  • the long TTI (for example, normal TTI, subframe, etc.) may be read as a TTI having a time length of more than 1 ms
  • the short TTI (for example, shortened TTI, etc.) may be read as a TTI less than the TTI length of the long TTI and 1 ms. It may be read as a TTI having the above TTI length.
  • the resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and may include one or a plurality of continuous subcarriers in the frequency domain.
  • the number of subcarriers contained in RB may be the same regardless of numerology, and may be, for example, 12.
  • the number of subcarriers contained in the RB may be determined based on numerology.
  • the time domain of RB may include one or more symbols, and may have a length of 1 slot, 1 mini slot, 1 subframe, or 1 TTI.
  • Each 1TTI, 1 subframe, etc. may be composed of one or a plurality of resource blocks.
  • One or more RBs are physical resource blocks (Physical RB: PRB), sub-carrier groups (Sub-Carrier Group: SCG), resource element groups (Resource Element Group: REG), PRB pairs, RB pairs, etc. May be called.
  • Physical RB Physical RB: PRB
  • sub-carrier groups Sub-Carrier Group: SCG
  • resource element groups Resource Element Group: REG
  • PRB pairs RB pairs, etc. May be called.
  • the resource block may be composed of one or a plurality of resource elements (ResourceElement: RE).
  • RE resource elements
  • 1RE may be a radio resource area of 1 subcarrier and 1 symbol.
  • Bandwidth Part (which may also be called partial bandwidth, etc.) may represent a subset of consecutive common resource blocks (RBs) for a neurology in a carrier. good.
  • the common RB may be specified by the index of the RB with respect to the common reference point of the carrier.
  • PRBs may be defined in a BWP and numbered within that BWP.
  • BWP may include BWP for UL (UL BWP) and BWP for DL (DL BWP).
  • BWP for UL
  • DL BWP BWP for DL
  • One or more BWPs may be set in one carrier for the UE.
  • At least one of the configured BWPs may be active, and the UE may not expect to send or receive a given signal / channel outside the active BWP.
  • “cell”, “carrier” and the like in this disclosure may be read as “BWP”.
  • the above-mentioned structures such as wireless frames, subframes, slots, mini-slots and symbols are merely examples.
  • the number of subframes contained in a wireless frame the number of slots per subframe or wireless frame, the number of minislots contained within a slot, the number of symbols and RBs contained in a slot or minislot, included in RB.
  • the number of subcarriers, as well as the number of symbols in the TTI, the symbol length, the cyclic prefix (CP) length, and other configurations can be changed in various ways.
  • connection means any direct or indirect connection or connection between two or more elements and each other. It can include the presence of one or more intermediate elements between two “connected” or “joined” elements.
  • the connection or connection between the elements may be physical, logical, or a combination thereof.
  • connection may be read as "access”.
  • the two elements use at least one of one or more wires, cables and printed electrical connections, and, as some non-limiting and non-comprehensive examples, the radio frequency domain. Can be considered to be “connected” or “coupled” to each other using electromagnetic energy having wavelengths in the microwave and light (both visible and invisible) regions.
  • the reference signal can also be abbreviated as Reference Signal (RS), and may be called a pilot (Pilot) depending on the applied standard.
  • RS Reference Signal
  • Pilot pilot
  • each of the above devices may be replaced with a "part”, a “circuit”, a “device”, or the like.
  • references to elements using designations such as “first” and “second” as used in this disclosure does not generally limit the quantity or order of those elements. These designations can be used in the present disclosure as a convenient way to distinguish between two or more elements. Therefore, references to the first and second elements do not mean that only two elements can be adopted there, or that the first element must somehow precede the second element.
  • determining and “determining” used in this disclosure may include a wide variety of actions.
  • “Judgment” and “decision” are, for example, judgment (judging), calculation (calculating), calculation (computing), processing (processing), derivation (deriving), investigation (investigating), search (looking up, search, inquiry). It may include (eg, searching in a table, database or another data structure), ascertaining as “judgment” or “decision”.
  • judgment and “decision” are receiving (for example, receiving information), transmitting (for example, transmitting information), input (input), output (output), and access. It may include (for example, accessing data in memory) to be regarded as “judgment” or “decision”.
  • judgment and “decision” are considered to be “judgment” and “decision” when the things such as solving, selecting, choosing, establishing, and comparing are regarded as “judgment” and “decision”. Can include. That is, “judgment” and “decision” may include considering some action as “judgment” and “decision”. Further, “judgment (decision)” may be read as “assuming", “expecting”, “considering” and the like.
  • the term "A and B are different” may mean “A and B are different from each other”.
  • the term may mean that "A and B are different from C”.
  • Terms such as “separate” and “combined” may be interpreted in the same way as “different”.
  • Radio communication system 20 NG-RAN 100 gNB 200 UE 1001 Processor 1002 Memory 1003 Storage 1004 Communication Device 1005 Input Device 1006 Output Device 1007 Bus

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  • Computer Networks & Wireless Communication (AREA)
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Abstract

Terminal transmettant et recevant des intervalles constitués d'une pluralité de symboles. Le terminal définit le facteur de compression à appliquer au domaine temporel des symboles. Le terminal définit le facteur de compression associé à chaque indicateur d'une pluralité d'indicateurs différents.
PCT/JP2020/019357 2020-05-14 2020-05-14 Terminal WO2021229776A1 (fr)

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Citations (1)

* Cited by examiner, † Cited by third party
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US20150381392A1 (en) * 2014-06-30 2015-12-31 Hughes Network Systems, Llc Optimized receivers for faster than nyquist (ftn) transmission rates in high spectral efficiency satellite systems

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US20150381392A1 (en) * 2014-06-30 2015-12-31 Hughes Network Systems, Llc Optimized receivers for faster than nyquist (ftn) transmission rates in high spectral efficiency satellite systems

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Title
ANAN MITSUTAKA; SAWAHASHI MAMORU; KISHIYAMA YOSHIHISA: "BLER Performance of Windowed-OFDM Using Faster-than-Nyquist Signaling with 16QAM", 2018 21ST INTERNATIONAL SYMPOSIUM ON WIRELESS PERSONAL MULTIMEDIA COMMUNICATIONS (WPMC), IEEE, 25 November 2018 (2018-11-25), pages 122 - 127, XP033549114, DOI: 10.1109/WPMC.2018.8713006 *
PANASONIC: "Considerations on waveform design for new radio interface", 3GPP DRAFT; R1-162551, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG1, no. Busan, Korea; 20160411 - 20160415, 1 April 2016 (2016-04-01), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France , XP051079610 *

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