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WO2018158925A1 - Terminal utilisateur et procédé de communication sans fil - Google Patents

Terminal utilisateur et procédé de communication sans fil Download PDF

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Publication number
WO2018158925A1
WO2018158925A1 PCT/JP2017/008375 JP2017008375W WO2018158925A1 WO 2018158925 A1 WO2018158925 A1 WO 2018158925A1 JP 2017008375 W JP2017008375 W JP 2017008375W WO 2018158925 A1 WO2018158925 A1 WO 2018158925A1
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WO
WIPO (PCT)
Prior art keywords
signal
transmission
data
dmrs
user terminal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2017/008375
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English (en)
Japanese (ja)
Inventor
一樹 武田
聡 永田
リフェ ワン
ギョウリン コウ
ホイリン ジャン
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NTT Docomo Inc
Original Assignee
NTT Docomo Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by NTT Docomo Inc filed Critical NTT Docomo Inc
Priority to PCT/JP2017/008375 priority Critical patent/WO2018158925A1/fr
Priority to CN201780089986.6A priority patent/CN110583062B/zh
Priority to JP2019502398A priority patent/JPWO2018158925A1/ja
Publication of WO2018158925A1 publication Critical patent/WO2018158925A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/04—Transmission power control [TPC]
    • H04W52/30—Transmission power control [TPC] using constraints in the total amount of available transmission power
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation

Definitions

  • the present invention relates to a user terminal and a wireless communication method in a next generation mobile communication system.
  • LTE Long Term Evolution
  • Non-Patent Document 1 LTE-A (LTE-Advanced), FRA (Future Radio Access), 4G, 5G, 5G + (plus), NR ( New RAT) and LTE Rel.14, 15 ⁇ ) are also being considered.
  • CA Carrier Aggregation
  • CC Component Carrier
  • UE User Equipment
  • DC Dual Connectivity
  • CG Cell Group
  • CC Carrier
  • Inter-eNB CA inter-base station CA
  • a downlink (DL: Downlink) and / or an uplink (UL: Uplink) communication is performed using a transmission time interval (TTI: Transmission Time Interval) of 1 ms. Is done.
  • TTI Transmission Time Interval
  • the 1 ms TTI is a transmission time unit of one channel-encoded data packet, and is a processing unit such as scheduling, link adaptation, and retransmission control (HARQ-ACK: Hybrid Automatic Repeat reQuest-Acknowledge).
  • a 1 ms TTI is also called a subframe, a subframe length, or the like.
  • Future wireless communication systems eg, 5G, NR, etc.
  • various wireless communication services eg, ultra-high speed, large capacity, ultra-low delay, etc.
  • eMBB enhanced Mobile Broad Band
  • mMTC massive Machine Type Communication
  • URLLC Ultra Reliable and Low Latency Communications
  • a TTI for example, a short TTI, sTTI, etc.
  • a 1 ms TTI in an existing LTE eg, LTE Rel. 8-13
  • a demodulation reference signal (DMRS: used for demodulation of data symbols) at least before, during and after the sTTI. It is preferable to have a configuration in which DeModulation Reference Signal) is transmitted.
  • the present invention has been made in view of the above points, and provides a user terminal and a wireless communication method capable of appropriately controlling UL transmission even when uplink data and a demodulation reference signal are transmitted using a short TTI.
  • One of the purposes is to provide it.
  • One aspect of the user terminal of the present invention is a transmitter that transmits, in a plurality of cells, UL signals and UL reference signals used for demodulation of the UL signals, using the same transmission time interval or different transmission time intervals;
  • a control unit that controls generation and / or transmission power of the UL signal and the UL reference signal, and the control unit controls a predetermined modulation scheme for the UL signal and / or the UL signal and the The same transmission power is applied to the UL reference signal.
  • UL transmission can be appropriately controlled even when uplink data and demodulation reference signals are transmitted using a short TTI.
  • 1A and 1B are diagrams illustrating an example of the configuration of sTTI. It is a figure which shows an example of UL transmission using multiple CC which applies sTTI.
  • 3A and 3B are diagrams illustrating an example of allocation of DMRS and UL data in sTTI.
  • 4A and 4B are diagrams illustrating an example of setting of transmission power of DMRS and UL data.
  • 5A and 5B are diagrams illustrating another example of setting of transmission power of DMRS and UL data.
  • 6A and 6B are diagrams illustrating an example of PHR reporting in UL transmission using sTTI.
  • 7A and 7B are diagrams illustrating another example of setting of transmission power of DMRS and UL data.
  • LTE introduces a shortened TTI (sTTI: shortened TTI) that has a shorter period than the existing transmission time interval (TTI: Transmission Frame Interval) (for example, subframe (1 ms)) as a method for reducing communication delay. It has been considered to control.
  • TTI Transmission Frame Interval
  • 5G / NR it is considered that UEs use different services simultaneously. In this case, it is considered to change the TTI length depending on the service.
  • TTI may represent a time unit for transmitting / receiving a transport block, a code block, and / or a code word of transmission / reception data.
  • a time interval (number of symbols) in which a data transport block, code block, and / or codeword is actually mapped may be shorter than the TTI.
  • the TTI when the TTI is composed of a predetermined number of symbols (for example, 14 symbols), a transport block, a code block, and / or a code word of transmission / reception data are included in one to a predetermined number of symbol sections. It can be sent and received.
  • a reference signal, a control signal, etc. are used for symbols not mapping data in the TTI. Can be mapped.
  • the UE may transmit and / or receive using both the long TTI and the short TTI.
  • the long TTI is a TTI having a longer time length than the short TTI (for example, a TTI having the same 1 ms time length as an existing subframe (TTI in LTE Rel. 8-13)), and is usually TTI (nTTI: normal TTI), 1 ms TTI, normal subframe, long subframe, subframe, slot, long slot, etc.
  • a long TTI may also be referred to as a lower (smaller) subcarrier spacing (eg, 15 kHz) TTI.
  • the long TTI has a time length of 1 ms, for example, and includes 14 symbols (in the case of a normal cyclic prefix (CP)) or 12 symbols (in the case of an extended CP).
  • Long TTI is considered suitable for services such as eMBB, mMTC, etc., in which delay reduction is not strictly required.
  • a downlink control channel (PDCCH: Physical Downlink Control Channel) and a downlink data channel (PDSCH: Physical) are transmitted and / or received in a TTI (subframe).
  • Downlink Shared Channel (PUCCH: Physical Uplink Control Channel)
  • PUSCH Physical Uplink Shared Channel
  • the short TTI is a TTI having a shorter time length than the long TTI, and may be called a shortened TTI, a partial TTI (partial or fractional TTI), a shortened subframe, a partial subframe, a minislot, a subslot, or the like. Also, in NR, a short TTI may be referred to as a higher (larger) subcarrier spacing (eg, 60 kHz) TTI.
  • the short TTI is composed of, for example, a smaller number of symbols (eg, 2 symbols, 7 symbols, etc.) than the long TTI, and the time length (symbol length) of each symbol is the same as the long TTI (eg, 66.7 ⁇ s). May be.
  • the short TTI may be composed of the same number of symbols as the long TTI, and the symbol length of each symbol may be shorter than the long TTI.
  • FIG. 1 shows an example of the configuration of a short TTI.
  • FIG. 1 illustrates a case where a plurality of short TTIs are set by dividing one subframe (14 OFDM symbols) into predetermined sections.
  • one subframe is divided into 3, 2, 2, 2, 2, 3 symbols to set a short TTI (sTTI # 0- # 5).
  • sTTI # 0 and # 5 are composed of 3 symbols
  • sTTI # 1 to # 4 are composed of 2 symbols.
  • Such a configuration is also referred to as 2-symbol sTTI (2-OS sTTI, 2OS (OFDM Symbol)).
  • it may be called sTTI configuration 1, sTTI format 1, sTTI configuration 1, and the like.
  • a short TTI (sTTI # 0- # 1) is set by dividing one subframe into 7 or 7 symbols.
  • sTTI # 0 and # 1 are composed of 7 symbols.
  • Such a configuration is also called 7-symbol sTTI (7-OS sTTI, 7OS).
  • sTTI configuration 2 sTTI format 2, sTTI configuration 2, and the like.
  • Short TTI When the short TTI is used, a time margin for processing (for example, encoding, decoding, etc.) in the UE and / or base station is increased, and processing delay can be reduced. Further, when the short TTI is used, the number of UEs that can be accommodated per unit time (for example, 1 ms) can be increased. Short TTI is considered suitable for services such as URLLC that require severe delay reduction.
  • the UE in which the short TTI is set uses a channel in a time unit shorter than the existing data and control channels.
  • a shortened downlink control channel sPDCCH: shortened PDCCH
  • a shortened downlink data channel sPDSCH: shortened PDSCH
  • a shortened uplink control channel sPUCCH: shortened
  • PUCCH shortened downlink data channel
  • sPUSCH shortened PUSCH
  • DMRS DeModulation Reference Signal
  • TDM time division multiplexing
  • IFDMA interleaved frequency division multiplexing
  • DMRS multiplexing can be performed by applying frequency resources and target received power that are not equal among a plurality of UEs.
  • Frequency resources that are not equal among a plurality of UEs include, for example, partially overlapping frequency resources, frequency resources in which at least one of the lower end and the upper end of the allocated frequency resource is different.
  • DMRS multiplexing when using a short TTI, it is considered to apply a cyclic shift (CS).
  • CS cyclic shift
  • orthogonality between UEs can be ensured by applying equal target resources and equal frequency resources to a plurality of UEs.
  • DMRS multiplexing may be controlled by combining IFDMA and cyclic shift.
  • the UE When performing UL transmission (for example, HARQ-ACK transmission for DL data and / or UL data transmission for UL grant) using short TTI, the UE transmits the UL transmission at a predetermined timing.
  • the short TTI is 2 symbols TTI (2OS) (see FIG. 1A)
  • UL transmission is performed after the first timing from the DL signal reception timing (for example, sTTI # n).
  • sTTI # n For example, k ⁇ sTTI (2OS) can be used as the first timing.
  • the UE performs UL transmission after n + ksTTI.
  • the value of k for example, 4, 6, 8, 10, 12, etc. are conceivable. Different values of k may be set according to the processing capability of the user terminal. In this case, it is desirable for the user terminal to report to the radio communication base station, in advance, terminal capability information that can recognize a k value that can be set based on its own processing capability.
  • the short TTI is 7 symbol TTI (7OS) (see FIG. 1B)
  • UL transmission is performed after the second timing from the DL signal reception timing (for example, sTTI # n).
  • sTTI # n For example, 4 ⁇ sTTI (7OS) can be used as the second timing.
  • the UE performs UL transmission after n + 4sTTI (2 subframes).
  • the UL transmission timing for the DL signal may be set according to the number of symbols constituting the sTTI. Note that the UL transmission timing is not limited to the values described above.
  • UL transmission is performed using a plurality of cells including at least a cell to which the short TTI is applied.
  • CC carrier aggregation
  • DC dual connectivity
  • the TTI length of UL CC used in CA and / or DC is set differently.
  • the same TTI length is set for CCs in the same group, and different TTI lengths are set for CCs in different groups. Conceivable.
  • DC it is possible that different TTI lengths are set for each master cell group (MCG) and secondary cell group (SCG).
  • a first TTI length (for example, 1 ms) is applied in the first UL CC # 1, and a second TTI length (for example, 2OS sTTI) is applied in the second UL CC # 2.
  • a first TTI length (for example, 7OS sTTI) is applied in the first UL CC # 1
  • a second TTI length (for example, 2OS sTTI) is applied in the second UL CC # 2.
  • UL data and DMRS are allocated discontinuously (for example, different sTTIs) in the time direction depending on the configuration of the short TTI.
  • a certain transmission period for example, a predetermined symbol or a predetermined sTTI
  • the transmission power is limited (power limited). In this case, it may be difficult to actually apply the same transmission power to UL data and DMRS transmitted in a non-continuous or different sTTI.
  • FIG. 2 shows a case where sTTI having the same TTI length is applied to each CC of DL and UL.
  • a configuration (2OS sTTI) in which one subframe (14 OFDM symbol) is divided into 3, 2, 2, 2, 2, 3 symbols is shown.
  • a DL signal for example, UL grant
  • UL transmission for example, UL data
  • DL signals are allocated to two symbols constituting sTTI # 8
  • a DMRS corresponding to the DL signal is transmitted using the symbol of sTTI # 7 immediately before.
  • UL transmission (for example, UL data) is performed on the DL signal (for example, UL grant) of CC # 2 by using sTTI # 7 of UL of CC # 2 after 6 ⁇ sTTI (2OS). Send).
  • DL signal for example, UL grant
  • Send Send
  • DMRS is assigned to one of two symbols constituting sTTI # 7 and DL signal is assigned to the other. That is, the DMRS corresponding to the DL signal is transmitted using the same sTTI.
  • UL data is transmitted with different symbols (or different sTTIs) in different CCs, but DMRS is transmitted with the same symbols (or the same sTTIs).
  • the UE since the UL data is transmitted by one CC, the UE can transmit each UL data with the required power set by the radio base station.
  • the UE since the DMRS is transmitted from different CCs, the UE may not be able to transmit the DMRS using the required power set by the base station (power limited).
  • transmission power control transmission power setting and / or power limited determination, etc. may be performed in symbol units or in sTTI units.
  • one of the UL signal and DMRS used for demodulation of the UL signal may be power limited in a predetermined CC.
  • the UE cannot apply the same transmission power to DMRS and UL data even if the same required power is set in DMRS and UL data (for example, DMRS and UL data of CC # 1).
  • UL data reception processing for example, demodulation processing based on DMRS
  • communication quality may deteriorate.
  • the present inventors transmit only one transmission due to the occurrence of power limited, etc. Focusing on the point that power may be limited, applying a predetermined modulation method to the UL signal and / or controlling to apply the same transmission power to the UL signal and the UL reference signal inspired.
  • transmission is controlled without allowing only one of UL signal transmission and UL reference signal transmission corresponding to the UL signal to overlap between a plurality of cells.
  • transmission is controlled by allowing only one of UL signal transmission and UL reference signal transmission corresponding to the UL signal to overlap between a plurality of cells.
  • demodulation using a UL reference signal across subframes corss-subframe DMRS demodulation
  • demodulation using a UL reference signal across slots cross-slot DMRS demodulation
  • transmission is controlled by allowing demodulation using a UL reference signal across subframes and / or demodulation using a UL reference signal across slots.
  • the short TTI may have any configuration as long as it is shorter than the long TTI (1 ms).
  • a short TTI is configured with a smaller number of symbols than a long TTI and each symbol has the same symbol length as the long TTI will be described, but the symbol length is different from the long TTI. It can be applied to the above as appropriate.
  • Each of the following aspects may be applied alone or in combination.
  • UL grant (DCI) instructing transmission of sPUSCH for example, UL data
  • sPUSCH UL data
  • the present embodiment is not limited to this.
  • the DL signal can be similarly applied to sPDSCH (for example, DL data) and the UL signal can be similarly applied to HARQ-ACK (for example, sPUCCH) for the DL data.
  • HARQ-ACK for example, sPUCCH
  • any signal that is demodulated using a reference signal can be similarly applied.
  • CA and / or DC is assumed as communication using a plurality of UL CCs, but the communication mode to which this embodiment is applicable is not limited to this. Any communication using a plurality of CCs can be applied.
  • the case where two cells (CC) are used is shown in the following description, the number of usable CCs is not limited to two and may be three or more. Moreover, it is also possible to apply when using a single CC.
  • the user terminal assumes that the UL data (UL data allocation symbol) also overlaps with the UL signal of another cell. (See FIG. 3A).
  • the DMRS used for demodulation of UL data in a predetermined cell does not overlap with the UL signal of another cell, it is assumed that the UL data (UL data allocation symbol) does not overlap with the UL signal of another cell (see FIG. 3B). ).
  • the user terminal can acquire information on the position (DMRS allocation symbol) where the DMRS is arranged from the radio base station. For example, when the sTTI is used in the UL, the radio base station uses the downlink control information and / or higher layer signaling (for example, RRC signaling, broadcast information, etc.) for information on the DMRS allocation pattern in each sTTI. To the user terminal.
  • the radio base station uses the downlink control information and / or higher layer signaling (for example, RRC signaling, broadcast information, etc.) for information on the DMRS allocation pattern in each sTTI.
  • FIG. 3 shows a case where sTTI is configured by dividing one subframe into 3, 2, 2, 2, 2, 3 symbols in CC # 1 and CC # 2 (2OS sTTI).
  • FIG. 3A shows a case where, in CC # 1, DMRS is assigned to some symbols (here, the first half symbol) of sTTI # 1, and UL data is assigned to two symbols of sTTI # 2.
  • the radio base station demodulates the sTTI # 2 UL data using the sTTI # 1 DMRS.
  • DMRS is assigned to some symbols (here, the first half symbols) of sTTI # 1.
  • the DMRS overlaps with the DMRS of CC # 1 and sTTI # 1. Therefore, the allocation is controlled so that the CC # 1 UL data also overlaps with the CC # 2 UL signal (UL data here).
  • the user terminal can assume that the other of UL data and DMRS overlaps with the UL signal of another cell.
  • Power limited means that UL transmissions overlap in a plurality of cells in a predetermined period, and the required power of each UL signal exceeds the allowable maximum power (Pcmax) set in the user terminal.
  • the user terminal When the power limit occurs, the user terminal performs power scaling (reduction of transmission power) of the transmission power of the predetermined UL signal or drops the predetermined UL signal.
  • the user terminal may perform power scaling based on a predetermined criterion. For example, the user terminal applies power scaling to UL data and DMRS corresponding to the UL data under the same condition (rule). Thereby, even if only one of UL data and DMRS becomes power limited, UL data and DMRS can be transmitted with the same transmission power.
  • DMRS and UL data are allocated to sTTI # 2 in CC # 1.
  • the radio base station demodulates the same sTTI # 2 UL data using the sTTI # 2 DMRS.
  • DMRS and UL data are allocated to sTTI # 1.
  • the allocation is controlled so that the UL data of CC # 1 does not overlap with the UL signal of CC # 2.
  • the user terminal can assume that the other of UL data and DMRS does not overlap with the UL signal of another cell.
  • control is performed so that only one of UL data and DMRS that demodulates the UL data does not overlap with UL transmission of other cells.
  • DMRS and UL data are transmitted discontinuously (for example, different sTTIs), only one of them can be prevented from overlapping and becoming power limited.
  • the user terminal can set the transmission power of DMRS and UL data appropriately (for example, the same), and can appropriately demodulate UL data in the radio base station.
  • the user terminal assumes that when a DMRS used for demodulation of UL data in a predetermined cell overlaps with a UL signal of another cell, the UL data may or may not overlap with a UL signal of another cell. Moreover, when DMRS utilized for demodulation of UL data in a predetermined cell does not overlap with UL signals of other cells, it is assumed that the UL data may or may not overlap with UL signals of other cells.
  • flexible allocation can be performed by controlling the UL data and DMRS allocation of a predetermined cell without considering the UL signal allocation of other cells.
  • UL data and DMRS overlaps with UL transmission of another cell, there is a possibility that only the one transmission becomes power limited.
  • the user terminal either applies a predetermined modulation scheme to UL data (sPUSCH) and / or applies the same transmission power to UL data and DMRS.
  • One transmission power (for example, the lower transmission power) is also applied to the other transmission.
  • the user terminal applies transport shift keying (for example, QPSK) to UL data (sPUSCH).
  • transport shift keying for example, QPSK
  • PUSCH transport shift keying
  • 16QAM and 64QAM are systems that perform modulation using amplitude and phase
  • QPSK is a system that performs modulation using phase. Therefore, by limiting the modulation scheme applied to UL data to phase shift keying, even when different transmission power is applied to UL data and DMRS, the radio base station can appropriately demodulate UL data. .
  • the user terminal can apply different transmission power to DMRS and UL data that are allocated discontinuously (for example, different sTTIs) in a predetermined cell (see FIG. 4).
  • the radio base station may instruct the user terminal to apply a predetermined modulation scheme (for example, QPSK) to UL data allocated discontinuously with the DMRS.
  • a predetermined modulation scheme for example, QPSK
  • the radio base station notifies the user terminal of the downlink control information (UL grant) instructing UL data transmission, including information instructing a predetermined modulation scheme.
  • the user terminal may perform control so that a predetermined modulation method is applied to the UL data when DMRS and UL data are allocated discontinuously.
  • FIG. 4A shows a case where DMRS is assigned to a part of sTTI # 1 of CC # 1, UL data is assigned to sTTI # 3, and DMRS and UL data are assigned to different symbols of sTTI # 1 of CC # 2. .
  • transmission of DMRS of sTTI # 1 overlaps between CC # 1 and CC # 2. Therefore, there is a possibility that the total value of the required power of each DMRS exceeds the maximum power (Pcmax) allowed for the user terminal and becomes power limited.
  • Pcmax maximum power
  • the user terminal can apply power scaling (reduction of transmission power) only to DMRS, and can transmit UL data transmission by applying required power (without performing power scaling). Further, the user terminal applies a predetermined modulation scheme (for example, QPSK) to UL data.
  • a predetermined modulation scheme for example, QPSK
  • FIG. 4B shows a case where DMRS is assigned to a part of sTTI # 1 of CC # 1, UL data is assigned to sTTI # 2, and DMRS and UL data are assigned to different symbols of sTTI # 2 of CC # 2. .
  • sTTI # 2 UL transmission (here, DMRS, UL data, and UL data) overlap between CC # 1 and CC # 2. Therefore, in sTTI # 2, there is a possibility that the total value of the required power of the UL signal exceeds the maximum power (Pcmax) allowed for the user terminal and becomes power limited.
  • the user terminal applies power scaling (reduction of transmission power) to DMRS and UL data that overlap between CCs, and applies power scaling to DMRS that does not overlap (RST # 1 of CC # 1). Can be sent without. Further, the user terminal applies a predetermined modulation scheme (for example, QPSK) to UL data.
  • a predetermined modulation scheme for example, QPSK
  • a predetermined modulation scheme is applied to UL data, and different transmission powers are allowed to be applied to DMRS and UL data.
  • the user terminal when power limitation occurs due to simultaneous transmission (overlap) of UL signals between a plurality of cells, the user terminal applies power scaling to the UL data and the DMRS corresponding to the UL data independently. Also good. In this case, the user terminal can control power scaling by setting the same priority to DMRS and UL data (sPUSCH).
  • FIG. 5A shows a case where power scaling is applied at the same rate to DMRS and UL data transmitted in sTTI # 2 of each cell.
  • power scaling is not applied to DMRS (here, sTTI # 2 of CC # 1) transmitted only in one cell.
  • the radio base station demodulates UL data to which power scaling is applied by using DMRS to which power scaling is not applied in CC # 1. In this case, since a predetermined modulation scheme is applied to the UL data, the radio base station can appropriately demodulate the UL data even when the transmission power of DMRS and UL data is different. Also, the radio base station uses DMRS to which power scaling is applied in CC # 2, and demodulates UL data to which power scaling is applied in the same manner as the DMRS.
  • the user terminal may control power scaling by setting different priorities for DMRS and UL data. For example, power scaling is performed with higher priority set for one transmission of DMRS and UL data than for the other transmission. In this case, it is possible to reduce the power reduced by power scaling or to apply no power scaling to transmissions with high priority. Thereby, the transmission power of the signal set with high priority can be selectively set high.
  • FIG. 5B shows a case where power scaling is controlled by setting a higher priority than DM data for DMRS and UL data respectively transmitted in sTTI # 2 of each cell.
  • power scaling is applied so that the transmission power of UL data becomes smaller (or power scaling is not applied to DMRS).
  • power scaling may be applied to symbols with overlapping UL data transmission.
  • transmission is performed using a modulation and coding scheme with a low operating SNR, improvement in channel estimation accuracy is more likely to contribute to performance improvement than securing data power. Therefore, by increasing the priority of DMRS, the UL data Demodulation performance can be improved.
  • the radio base station demodulates UL data to which power scaling is applied by using DMRS to which power scaling is not applied in CC # 1. Also, the radio base station demodulates UL data to which power scaling is applied, using DMRS to which power scaling is not applied (or power consumption is less than that of UL data) in CC # 2.
  • a priority for power scaling it may be set in consideration of a cell index in addition to a signal type.
  • the user terminal can calculate a power headroom report (PHR) using DMRS and / or UL data (sPUSCH).
  • PHR power headroom report
  • the PHR is a report that the user terminal feeds back to a device on the network side (for example, a radio base station), and includes information on an uplink power margin (PH: Power Headroom) for each serving cell.
  • the radio base station can dynamically control the uplink transmission power of the user terminal based on the PHR reported from the user terminal.
  • a user terminal transmits PHR by MAC signaling using PUSCH.
  • the PHR is composed of a PHR MAC CE (Control Element) included in a MAC PDU (Protocol Data Unit).
  • PHR MAC CE Control Element
  • MAC PDU Protocol Data Unit
  • Type 1 PH is PH when considering only the power of PUSCH
  • Type 2 PH is PH when considering both PUSCH and PUCCH power.
  • the PH information may be a PH value or an index associated with the PH value (or level).
  • the user terminal may calculate the PHR based on one of DMRS and UL data.
  • PHR When performing power scaling, it is preferable to calculate PHR using DMRS or UL data before power scaling. This is because when the required transmission power exceeds the maximum transmission power (becomes power limited), the value of PHR indicates a negative (dB) value, so it is determined whether the user terminal is power limited. This is because the base station can be identified.
  • the user terminal when performing power scaling as illustrated in FIG. 5A, calculates PHR based on DMRS (DMRS of sTTI # 1) to which power scaling is not applied, and reports the PHR to the radio base station (see FIG. 6A, (See FIG. 6B).
  • the user terminal calculates the PHR based on the UL data (sTTI # 2 UL data) before applying power scaling, and reports the PHR to the radio base station (see FIG. 6A and FIG. 6B).
  • the PHR may be calculated based on one of them, or the PHR may be calculated and reported based on a plurality of UL data.
  • the user terminal may apply power set to one of UL data and DMRS to the other transmission.
  • the smaller transmission power among the transmission power set in UL data and DMRS is applied as the actual transmission power of UL data and DMRS.
  • the user terminal uses one of the powers # 1 and # 2 (for example, the smaller power). Is selected and applied to both UL data and DMRS for transmission.
  • the powers P # 1 and P # 2 may be values that take into account (reflect) scheduling information, TPC commands, power scaling factors, and the like notified from the radio base station.
  • the powers P # 1 and P # 2 may be required power requested from the radio base station for DMRS and UL data, or may be power obtained by applying a TPC command to the required power. However, it may be electric power considering power scaling.
  • DMRS is allocated to a part of sTTI # 1 in CC # 1, and UL data is allocated to sTTI # 2. Also, in CC # 2, DMRS and UL data are allocated to sTTI # 1. In this case, DMRS overlaps in sTTI # 1. Therefore, the DMRS transmission power of each CC is set to a value that takes into account power limitation (or power reduced from the required power by power scaling). On the other hand, since UL data does not overlap between CCs, high transmission power is set. In this case, the user terminal controls transmission by applying power P # 1 set in DMRS to power P # 2 of UL data.
  • DMRS is allocated to a part of sTTI # 1 in CC # 1, and UL data is allocated to sTTI # 2.
  • DMRS and UL data are allocated to sTTI # 2 in CC # 2.
  • the transmission power of DMRS and UL data of each CC is set to a value that considers power limit (or power that is reduced from the required power by power scaling).
  • the user terminal applies the power P # 2 set in the UL data of sTTI # 2 to the DMRS power P # 1 of sTTI # 1 to control transmission.
  • the UL data modulation scheme can be used without being limited to a predetermined modulation scheme (for example, QPSK).
  • FIG. 8 shows a case where signal transmission / reception is performed using 2CC to which different TTI lengths are applied.
  • 2OS sTTI is applied in UL and DL
  • 7OS sTTI is applied in UL and DL.
  • CC # 1 includes a section in which one subframe (14 OFDM symbols) is divided into 3, 2, 2, 2, 2, 3 symbols and sTTI is 3 symbols (2OS is composed of 3 symbols). It is.
  • FIG. 8 shows a case where the transmission timing of the UL signal (for example, UL data) with respect to the DL signal (for example, UL grant) in CC # 1 is N + 6sTTI (2OS). Moreover, the case where the transmission timing of the UL signal with respect to the DL signal in CC # 2 is n + 4sTTI (7OS) is shown. In this way, the transmission timing of the UL signal for the DL signal can be set according to the TTI length. Note that the transmission timing of the UL signal with respect to the DL signal is not limited to this.
  • UL data and DMRS that demodulates the UL data may be arranged discontinuously (for example, different sTTI).
  • sTTI for example, 2OS sTTI
  • sTTI # 15 (2OS) in FIG. 8 sTTI # 15 (2OS) in FIG. 8
  • sTTI # 14 (2OS) in FIG. 8 sTTI # 14
  • the UL data is demodulated using the DMRS transmitted to.
  • DMRS and UL data are arranged across slots.
  • UL data allocation is controlled in units of 7 symbols (slots). Therefore, as shown in FIG. 8, UL transmission may not be performed in a certain slot (for example, sTTI # 4 (7OS)), and UL transmission may be performed in the next slot (for example, sTTI # 5 (7OS)).
  • sTTI # 14 (2OS) of CC # 1 overlaps with sTTI # 4 (7OS) of CC # 2
  • DMRS and UL data may be arranged across subframes. Therefore, even when performing UL transmission using CC # 1 to which a predetermined TTI length (for example, 2OS) is applied and CC # 2 to which a subframe (1 ms) is applied, UL data and One of the DMRSs may become power limited.
  • sTTI for example, 2OS sTTI
  • transmission is controlled without allowing demodulation using DMRS across subframes and / or slots. That is, control is performed so that UL data and DMRS used for demodulation of the UL data are not arranged in different subframes and / or different slots.
  • the user terminal assumes that the UL data and the DMRS used for demodulation of the UL data are not arranged in different subframes and / or different slots, and the transmission power control of DMRS used for demodulation of the UL data and UL data, the power head Perform room calculations, etc.
  • the transmission power of UL data and / or DMRS may be set without changing in at least one period of a subframe and sTTI (for example, slot (7OS sTTI), 2OS sTTI).
  • sTTI for example, slot (7OS sTTI), 2OS sTTI.
  • the same transmission power is set for discontinuous DMRS and UL data by adopting a configuration in which the power is not changed in the subframe and sTTI periods.
  • DMRS and UL data are allocated so as not to cross subframes and / or slots, and transmission power is not changed within the subframe and / or sTTI period, thereby determining whether or not power limited has occurred, DMRS and UL data. Can be common to both. When power limited occurs in DMRS and UL data, power scaling under the same conditions may be applied to the DMRS and UL data.
  • transmission is controlled by allowing demodulation using DMRS across subframes and / or slots. That is, it is allowed to arrange UL data and DMRS used for demodulation of the UL data in different subframes and / or different slots.
  • the user terminal either applies a predetermined modulation scheme to UL data (sPUSCH) and / or applies the same transmission power to UL data and DMRS.
  • One transmission power (for example, the lower transmission power) is also applied to the other transmission.
  • the application of the predetermined modulation scheme to UL data and / or the application of the same transmission power to UL data and DMRS can use the method shown in the second aspect.
  • wireless communication system Wireless communication system
  • the radio communication method according to each of the above aspects is applied.
  • wireless communication method which concerns on each said aspect may be applied independently, respectively, and may be applied in combination.
  • FIG. 9 is a diagram illustrating an example of a schematic configuration of the wireless communication system according to the present embodiment.
  • carrier aggregation (CA) and / or dual connectivity (DC) in which a plurality of basic frequency blocks (component carriers) each having a system bandwidth (for example, 20 MHz) of the LTE system as one unit are applied.
  • the wireless communication system 1 may be referred to as SUPER 3G, LTE-A (LTE-Advanced), IMT-Advanced, 4G, 5G, FRA (Future Radio Access), NR (New Rat), or the like.
  • the radio communication system 1 shown in FIG. 9 includes a radio base station 11 that forms a macro cell C1, and radio base stations 12a to 12c that are arranged in the macro cell C1 and form a small cell C2 that is narrower than the macro cell C1. .
  • the user terminal 20 is arrange
  • a configuration may be adopted in which different neurology (for example, different TTI length and / or processing time) is applied between cells. Numerology refers to a signal design in a certain RAT and a set of communication parameters that characterize the RAT design.
  • the user terminal 20 can be connected to both the radio base station 11 and the radio base station 12. It is assumed that the user terminal 20 uses the macro cell C1 and the small cell C2 that use different frequencies simultaneously by CA or DC. In addition, the user terminal 20 can apply CA or DC using a plurality of cells (CC) (for example, two or more CCs). Further, the user terminal can use the license band CC and the unlicensed band CC as a plurality of cells. In addition, it can be set as the structure by which the FDD carrier and / or TDD carrier which apply shortened TTI are included in either of several cells.
  • CC cells
  • TDD carrier and / or TDD carrier which apply shortened TTI are included in either of several cells.
  • Communication between the user terminal 20 and the radio base station 11 can be performed using a carrier having a relatively low frequency band (for example, 2 GHz) and a narrow bandwidth (referred to as an existing carrier or a legacy carrier).
  • a carrier having a wide bandwidth in a relatively high frequency band for example, 3.5 GHz, 5 GHz, 30 to 70 GHz, etc.
  • the same carrier as that between the base station 11 and the base station 11 may be used.
  • the configuration of the frequency band used by each radio base station is not limited to this.
  • a wired connection for example, an optical fiber compliant with CPRI (Common Public Radio Interface), an X2 interface, etc.
  • a wireless connection It can be set as the structure to do.
  • the radio base station 11 and each radio base station 12 are connected to the higher station apparatus 30 and connected to the core network 40 via the higher station apparatus 30.
  • the upper station device 30 includes, for example, an access gateway device, a radio network controller (RNC), a mobility management entity (MME), and the like, but is not limited thereto.
  • RNC radio network controller
  • MME mobility management entity
  • Each radio base station 12 may be connected to the higher station apparatus 30 via the radio base station 11.
  • the radio base station 11 is a radio base station having a relatively wide coverage, and may be called a macro base station, an aggregation node, an eNB (eNodeB), a transmission / reception point, or the like.
  • the radio base station 12 is a radio base station having local coverage, and includes a small base station, a micro base station, a pico base station, a femto base station, a HeNB (Home eNodeB), an RRH (Remote Radio Head), and transmission / reception. It may be called a point.
  • the radio base stations 11 and 12 are not distinguished, they are collectively referred to as a radio base station 10.
  • Each user terminal 20 is a terminal compatible with various communication methods such as LTE and LTE-A, and may include not only a mobile communication terminal but also a fixed communication terminal.
  • OFDMA orthogonal frequency division multiple access
  • SC-FDMA single carrier-frequency division multiple access
  • OFDMA is a multi-carrier transmission scheme that performs communication by dividing a frequency band into a plurality of narrow frequency bands (subcarriers) and mapping data to each subcarrier.
  • SC-FDMA is a single-carrier transmission scheme that reduces interference between terminals by dividing the system bandwidth into bands consisting of one or continuous resource blocks for each terminal and using a plurality of terminals with mutually different bands. is there.
  • the uplink and downlink radio access schemes are not limited to these combinations, and OFDMA may be used in the UL.
  • DL channels DL data channels (PDSCH: Physical Downlink Shared Channel, also referred to as DL shared channel) shared by each user terminal 20, broadcast channels (PBCH: Physical Broadcast Channel), L1 / L2 A control channel or the like is used.
  • PDSCH Physical Downlink Shared Channel
  • PBCH Physical Broadcast Channel
  • SIB System Information Block
  • MIB Master Information Block
  • L1 / L2 control channels include DL control channels (PDCCH (Physical Downlink Control Channel), EPDCCH (Enhanced Physical Downlink Control Channel)), PCFICH (Physical Control Format Indicator Channel), PHICH (Physical Hybrid-ARQ Indicator Channel), etc. .
  • Downlink control information (DCI: Downlink Control Information) including scheduling information of PDSCH and PUSCH is transmitted by PDCCH.
  • the number of OFDM symbols used for PDCCH is transmitted by PCFICH.
  • the HAICH transmission confirmation information (ACK / NACK) for PUSCH is transmitted by PHICH.
  • EPDCCH is frequency-division multiplexed with PDSCH (downlink shared data channel), and is used for transmission of DCI and the like in the same manner as PDCCH.
  • a UL data channel (PUSCH: Physical Uplink Shared Channel, also referred to as a UL shared channel) shared by each user terminal 20, a UL control channel (PUCCH: Physical Uplink Control Channel), random An access channel (PRACH: Physical Random Access Channel) or the like is used.
  • PUSCH Physical Uplink Shared Channel
  • PUCCH Physical Uplink Control Channel
  • PRACH Physical Random Access Channel
  • User data and higher layer control information are transmitted by the PUSCH.
  • Uplink control information including at least one of delivery confirmation information (ACK / NACK) and radio quality information (CQI) is transmitted by PUSCH or PUCCH.
  • a random access preamble for establishing connection with a cell is transmitted by the PRACH.
  • FIG. 10 is a diagram illustrating an example of the overall configuration of the radio base station according to the present embodiment.
  • the radio base station 10 includes a plurality of transmission / reception antennas 101, an amplifier unit 102, a transmission / reception unit 103, a baseband signal processing unit 104, a call processing unit 105, and a transmission path interface 106.
  • the transmission / reception antenna 101, the amplifier unit 102, and the transmission / reception unit 103 may each be configured to include one or more.
  • DL data transmitted from the radio base station 10 to the user terminal 20 is input from the higher station apparatus 30 to the baseband signal processing unit 104 via the transmission path interface 106.
  • PDCP Packet Data Convergence Protocol
  • RLC Radio Link Control
  • MAC Medium Access
  • Retransmission control for example, HARQ transmission processing
  • scheduling for example, transmission format selection, channel coding, Inverse Fast Fourier Transform (IFFT) processing, precoding processing, and other transmission processing
  • IFFT Inverse Fast Fourier Transform
  • precoding processing precoding processing
  • other transmission processing are performed and the transmission / reception unit 103.
  • the DL control signal is also subjected to transmission processing such as channel coding and inverse fast Fourier transform, and is transferred to the transmission / reception unit 103.
  • the transmission / reception unit 103 converts the baseband signal output by precoding for each antenna from the baseband signal processing unit 104 to a radio frequency band and transmits the converted signal.
  • the radio frequency signal frequency-converted by the transmission / reception unit 103 is amplified by the amplifier unit 102 and transmitted from the transmission / reception antenna 101.
  • the transmission / reception unit 103 can be configured by a transmitter / receiver, a transmission / reception circuit, or a transmission / reception device, which is described based on common recognition in the technical field according to the present invention.
  • the transmission / reception part 103 may be comprised as an integral transmission / reception part, and may be comprised from a transmission part and a receiving part.
  • the radio frequency signal received by the transmission / reception antenna 101 is amplified by the amplifier unit 102.
  • the transmission / reception unit 103 receives the UL signal amplified by the amplifier unit 102.
  • the transmission / reception unit 103 converts the frequency of the received signal into a baseband signal and outputs it to the baseband signal processing unit 104.
  • the baseband signal processing unit 104 performs Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing, and error correction on user data included in the input UL signal. Decoding, MAC retransmission control reception processing, RLC layer and PDCP layer reception processing are performed and transferred to the upper station apparatus 30 via the transmission path interface 106.
  • the call processing unit 105 performs call processing such as communication channel setting and release, state management of the radio base station 10, and radio resource management.
  • the transmission path interface 106 transmits and receives signals to and from the higher station apparatus 30 via a predetermined interface.
  • the transmission path interface 106 transmits / receives signals (backhaul signaling) to / from other radio base stations 10 via an interface between base stations (for example, an optical fiber compliant with CPRI (Common Public Radio Interface), X2 interface). May be.
  • CPRI Common Public Radio Interface
  • X2 interface May be.
  • the transmission / reception unit 103 includes a DL signal (for example, a DL control signal (DL control channel), a DL data signal (DL data channel, a DL shared channel), a DL reference signal (DM-RS, CSI-RS, etc.), and a discovery signal. , Synchronization signals, broadcast signals, etc.) and UL signals (eg, UL control signals (UL control channel), UL data signals (UL data channel, UL shared channel), UL reference signals, etc.) are received.
  • DL signal for example, a DL control signal (DL control channel), a DL data signal (DL data channel, a DL shared channel), a DL reference signal (DM-RS, CSI-RS, etc.
  • DM-RS DL reference signal
  • CSI-RS CSI-RS
  • the transmission / reception unit 103 receives the UL signal transmitted from the user terminal and the UL reference signal used for demodulation of the UL signal using the same transmission time interval or different transmission time intervals. In addition, the transmission / reception unit 103 notifies the user terminal of information regarding the allocation position (DMRS pattern) of the UL reference signal (DMRS) in a predetermined short TTI. Moreover, the transmission / reception part 103 may notify the information regarding the modulation system which a user terminal applies to UL signal (for example, sPUSCH).
  • the transmission unit and the reception unit of the present invention are configured by the transmission / reception unit 103 and / or the transmission path interface 106.
  • FIG. 11 is a diagram illustrating an example of a functional configuration of the radio base station according to the present embodiment. Note that FIG. 11 mainly shows functional blocks of characteristic portions in the present embodiment, and the wireless base station 10 also has other functional blocks necessary for wireless communication.
  • the baseband signal processing unit 104 includes at least a control unit 301, a transmission signal generation unit 302, a mapping unit 303, a reception signal processing unit 304, and a measurement unit 305.
  • the control unit 301 controls the entire radio base station 10.
  • the control part 301 can be comprised from the controller, the control circuit, or control apparatus demonstrated based on the common recognition in the technical field which concerns on this invention.
  • the control unit 301 controls signal generation by the transmission signal generation unit 302 and signal allocation by the mapping unit 303, for example.
  • the control unit 301 also controls signal reception processing by the reception signal processing unit 304 and signal measurement by the measurement unit 305.
  • the control unit 301 controls scheduling (for example, resource allocation) of DL signals and / or UL signals. Specifically, the control unit 301 generates and transmits a DCI (DL assignment) including scheduling information of the DL data channel and a DCI (UL grant) including scheduling information of the UL data channel. 302, the mapping unit 303, and the transmission / reception unit 103 are controlled.
  • a DCI DL assignment
  • a DCI UL grant
  • the control unit 301 controls assignment of UL signals so that only one of UL signal transmission and UL reference signal transmission corresponding to the UL signal does not overlap between a plurality of cells (first mode). Alternatively, the control unit 301 controls allocation by allowing only one of UL signal transmission and UL reference signal transmission corresponding to the UL signal to overlap between a plurality of cells (second mode).
  • control unit 301 may not allow demodulation using a UL reference signal across subframes (corss-subframe DMRS demodulation) and / or demodulation using a UL reference signal across slots (cross-slot DMRS demodulation). (3rd mode).
  • control unit 301 controls allocation by allowing demodulation using a UL reference signal that crosses subframes and / or demodulation using a UL reference signal that crosses slots (fourth aspect).
  • the control unit 301 controls the UL signal and the UL reference signal that demodulates the UL signal to be arranged continuously or discontinuously. For example, the control unit 301 performs control so that the UL signal and the UL reference signal are arranged in the same sTTI or different sTTIs. Moreover, the control part 301 may restrict
  • limit the modulation system applied to UL signal for example, sPUSCH
  • transport shift keying modulation for example, QPSK
  • the transmission signal generation unit 302 generates a DL signal (DL reference signal such as DL control channel, DL data channel, DM-RS, etc.) based on an instruction from the control unit 301, and outputs the DL signal to the mapping unit 303.
  • the transmission signal generation unit 302 can be configured by a signal generator, a signal generation circuit, or a signal generation device described based on common recognition in the technical field according to the present invention.
  • the mapping unit 303 maps the DL signal generated by the transmission signal generation unit 302 to a predetermined radio resource based on an instruction from the control unit 301, and outputs the DL signal to the transmission / reception unit 103.
  • the mapping unit 303 can be configured by a mapper, a mapping circuit, or a mapping device described based on common recognition in the technical field according to the present invention.
  • the reception signal processing unit 304 performs reception processing (for example, demapping, demodulation, decoding, etc.) on the reception signal input from the transmission / reception unit 103.
  • the received signal is, for example, a UL signal (UL control channel, UL data channel, UL reference signal, etc.) transmitted from the user terminal 20.
  • the received signal processing unit 304 controls demodulation processing of the corresponding UL signal (for example, sPUSCH) based on the uplink reference signal transmitted from the user terminal.
  • the reception signal processing unit 304 can be configured by a signal processor, a signal processing circuit, or a signal processing device described based on common recognition in the technical field according to the present invention.
  • the reception signal processing unit 304 outputs the information decoded by the reception processing to the control unit 301.
  • the reception processing unit 304 outputs at least one of a preamble, control information, and UL data to the control unit 301.
  • the reception signal processing unit 304 outputs the reception signal and the signal after reception processing to the measurement unit 305.
  • the measurement unit 305 performs measurement on the received signal.
  • the measurement part 305 can be comprised from the measuring device, measurement circuit, or measurement apparatus demonstrated based on common recognition in the technical field which concerns on this invention.
  • the measurement unit 305 may measure, for example, received power (for example, RSRP (Reference Signal Received Power)), reception quality (for example, RSRQ (Reference Signal Received Quality)), channel state, and the like of the received signal.
  • the measurement result may be output to the control unit 301.
  • FIG. 12 is a diagram illustrating an example of the overall configuration of the user terminal according to the present embodiment.
  • the user terminal 20 includes a plurality of transmission / reception antennas 201, an amplifier unit 202, a transmission / reception unit 203, a baseband signal processing unit 204, and an application unit 205.
  • the transmission / reception antenna 201, the amplifier unit 202, and the transmission / reception unit 203 may each be configured to include one or more.
  • the radio frequency signal received by the transmission / reception antenna 201 is amplified by the amplifier unit 202.
  • the transmission / reception unit 203 receives the DL signal amplified by the amplifier unit 202.
  • the transmission / reception unit 203 converts the frequency of the received signal into a baseband signal and outputs it to the baseband signal processing unit 204.
  • the transmission / reception unit 203 can be configured by a transmitter / receiver, a transmission / reception circuit, or a transmission / reception device described based on common recognition in the technical field according to the present invention.
  • the transmission / reception unit 203 may be configured as an integral transmission / reception unit, or may be configured from a transmission unit and a reception unit.
  • the baseband signal processing unit 204 performs FFT processing, error correction decoding, retransmission control reception processing, and the like on the input baseband signal.
  • the DL data is transferred to the application unit 205.
  • the application unit 205 performs processing related to layers higher than the physical layer and the MAC layer. Of the DL data, system information and higher layer control information are also transferred to the application unit 205.
  • UL data is input from the application unit 205 to the baseband signal processing unit 204.
  • the baseband signal processing unit 204 performs transmission / reception by performing retransmission control transmission processing (for example, HARQ transmission processing), channel coding, precoding, discrete Fourier transform (DFT) processing, IFFT processing, and the like. Is transferred to the unit 203.
  • the transmission / reception unit 203 converts the baseband signal output from the baseband signal processing unit 204 into a radio frequency band and transmits it.
  • the radio frequency signal frequency-converted by the transmission / reception unit 203 is amplified by the amplifier unit 202 and transmitted from the transmission / reception antenna 201.
  • the transmission / reception unit 203 includes a DL signal (for example, a DL control signal (DL control channel), a DL data signal (DL data channel, a DL shared channel), a DL reference signal (DM-RS, CSI-RS, etc.), and a discovery signal.
  • a DL signal for example, a DL control signal (DL control channel), a DL data signal (DL data channel, a DL shared channel), a DL reference signal (DM-RS, CSI-RS, etc.), and a discovery signal.
  • a UL signal for example, UL control signal (UL control channel), UL data signal (UL data channel, UL shared channel), UL reference signal, etc.
  • the transmission / reception unit 203 transmits the UL signal and the UL reference signal used for demodulation of the UL signal using the same transmission time interval or different transmission time intervals.
  • the transmission / reception unit 203 receives information on the allocation position (DMRS pattern) of the UL reference signal (DMRS) in a predetermined short TTI.
  • the transmission / reception unit 203 may receive information on a modulation scheme applied to the UL signal (for example, sPUSCH).
  • the transmission / reception unit 203 performs transmission without allowing only one of UL signal transmission and UL reference signal transmission to overlap between a plurality of cells (first mode), or performs transmission with allowance ( Second aspect).
  • FIG. 13 is a diagram illustrating an example of a functional configuration of the user terminal according to the present embodiment. Note that FIG. 13 mainly shows functional blocks of characteristic portions in the present embodiment, and the user terminal 20 also has other functional blocks necessary for wireless communication. As illustrated in FIG. 13, the baseband signal processing unit 204 included in the user terminal 20 includes a control unit 401, a transmission signal generation unit 402, a mapping unit 403, a reception signal processing unit 404, and a measurement unit 405. At least.
  • the control unit 401 controls the entire user terminal 20.
  • the control unit 401 can be composed of a controller, a control circuit, or a control device described based on common recognition in the technical field according to the present invention.
  • the control unit 401 controls, for example, signal generation by the transmission signal generation unit 402 and signal allocation by the mapping unit 403.
  • the control unit 401 controls signal reception processing by the reception signal processing unit 404 and signal measurement by the measurement unit 405.
  • the control unit 401 controls the transmission of the UL signal so that only one of the transmission of the UL signal and the transmission of the UL reference signal corresponding to the UL signal does not overlap between the plurality of cells (first mode). Alternatively, the control unit 401 controls transmission by allowing only one of UL signal transmission and UL reference signal transmission corresponding to the UL signal to overlap between a plurality of cells (second mode).
  • control unit 401 does not allow demodulation using a UL reference signal across subframes (corss-subframe DMRS demodulation) and / or demodulation using a UL reference signal across slots (cross-slot DMRS demodulation).
  • the transmission is controlled (third mode).
  • control unit 401 controls transmission by allowing demodulation using a UL reference signal across subframes and / or demodulation using a UL reference signal across slots (fourth aspect).
  • the control unit 401 applies a predetermined modulation scheme to the UL signal and / or the same transmission power to the UL signal and the UL reference signal.
  • the control unit 401 applies transport shift modulation to the UL signal, and applies different transmission power to the UL signal and the UL reference signal that are discontinuously arranged in the time direction in the predetermined cell.
  • the control unit 401 applies power scaling to the UL signal and the UL reference signal independently (see FIGS. 4 and 5). ).
  • control unit 401 may set a lower transmission power among the transmission power required for the UL signal and the transmission power required for the UL reference signal as the transmission power of the UL signal and the UL reference signal (FIG. 7). reference).
  • the transmission signal generation unit 402 generates a UL signal (UL control channel, UL data channel, UL reference signal, etc.) based on an instruction from the control unit 401, and outputs the UL signal to the mapping unit 403.
  • the transmission signal generation unit 402 can be configured by a signal generator, a signal generation circuit, or a signal generation device described based on common recognition in the technical field according to the present invention.
  • the mapping unit 403 maps the UL signal generated by the transmission signal generation unit 402 to a radio resource based on an instruction from the control unit 401, and outputs it to the transmission / reception unit 203.
  • the mapping unit 403 can be configured by a mapper, a mapping circuit, or a mapping device described based on common recognition in the technical field according to the present invention.
  • the reception signal processing unit 404 performs reception processing (for example, demapping, demodulation, decoding, etc.) on the reception signal input from the transmission / reception unit 203.
  • the received signal is, for example, a DL signal (DL control channel, DL data channel, DL reference signal, etc.) transmitted from the radio base station 10.
  • the reception signal processing unit 404 can be configured by a signal processor, a signal processing circuit, or a signal processing device described based on common recognition in the technical field according to the present invention. Further, the reception signal processing unit 404 can constitute a reception unit according to the present invention.
  • the received signal processing unit 404 performs blind decoding on the DL control channel that schedules transmission and / or reception of the DL data channel based on an instruction from the control unit 401, and performs DL data channel reception processing based on the DCI.
  • Received signal processing section 404 estimates the channel gain based on DM-RS or CRS, and demodulates the DL data channel based on the estimated channel gain.
  • the reception signal processing unit 404 outputs the information decoded by the reception processing to the control unit 401.
  • the reception signal processing unit 404 outputs broadcast information, system information, RRC signaling, DCI, and the like to the control unit 401, for example.
  • the reception signal processing unit 404 may output the data decoding result to the control unit 401.
  • the reception signal processing unit 404 outputs the reception signal and the signal after reception processing to the measurement unit 405.
  • the measurement unit 405 performs measurement on the received signal. For example, the measurement unit 405 measures the channel state based on a channel state measurement reference signal (CSI-RS) transmitted from the radio base station. Further, the measurement unit 405 may measure the received power (for example, RSRP) and DL reception quality (for example, RSRQ) of the received signal. The measurement result may be output to the control unit 401.
  • the measurement part 405 can be comprised from the measuring device, measurement circuit, or measurement apparatus demonstrated based on common recognition in the technical field which concerns on this invention.
  • each functional block may be realized by one device physically and / or logically coupled, and two or more devices physically and / or logically separated may be directly and / or indirectly. (For example, wired and / or wireless) and may be realized by these plural devices.
  • a radio base station, a user terminal, etc. in an embodiment of the present invention may function as a computer that performs processing of the radio communication method of the present invention.
  • FIG. 14 is a diagram illustrating an example of a hardware configuration of a radio base station and a user terminal according to an embodiment of the present invention.
  • the wireless base station 10 and the user terminal 20 described above may be physically 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. Good.
  • the term “apparatus” can be read as a circuit, a device, a unit, or the like.
  • the hardware configurations of the radio base station 10 and the user terminal 20 may be configured to include one or a plurality of each device illustrated in the figure, or may be configured not to include some devices.
  • processor 1001 may be implemented by one or more chips.
  • each function in the radio base station 10 and the user terminal 20 reads predetermined software (program) on hardware such as the processor 1001 and the memory 1002, so that the processor 1001 performs computation and communication by the communication device 1004.
  • predetermined software program
  • it is realized by controlling data reading and / or writing in the memory 1002 and the storage 1003.
  • the processor 1001 controls the entire computer by operating an operating system, for example.
  • the processor 1001 may be configured by a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic device, a register, and the like.
  • CPU central processing unit
  • the baseband signal processing unit 104 (204) and the call processing unit 105 described above may be realized by the processor 1001.
  • the processor 1001 reads programs (program codes), software modules, data, and the like from the storage 1003 and / or the communication device 1004 to the memory 1002, and executes various processes according to these.
  • programs program codes
  • software modules software modules
  • data data
  • the like data
  • the control unit 401 of the user terminal 20 may be realized by a control program stored in the memory 1002 and operated by the processor 1001, and may be realized similarly for other functional blocks.
  • the memory 1002 is a computer-readable recording medium such as a ROM (Read Only Memory), an EPROM (Erasable Programmable ROM), an EEPROM (Electrically EPROM), a RAM (Random Access Memory), or any other suitable storage medium. It may be configured by one.
  • the memory 1002 may be called a register, a cache, a main memory (main storage device), or the like.
  • the memory 1002 can store programs (program codes), software modules, and the like that can be executed to implement the wireless communication method according to an embodiment of the present invention.
  • the storage 1003 is a computer-readable recording medium such as a flexible disk, a floppy (registered trademark) disk, a magneto-optical disk (for example, a compact disk (CD-ROM (Compact Disc ROM)), a digital versatile disk, Blu-ray® disk), removable disk, hard disk drive, smart card, flash memory device (eg, card, stick, key drive), magnetic stripe, database, server, or other suitable storage medium It may be constituted by.
  • the storage 1003 may be referred to as an auxiliary storage device.
  • the communication device 1004 is hardware (transmission / reception device) for performing communication between computers via a wired and / or wireless network, and is also referred to as 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 frequency division duplex (FDD) and / or time division duplex (TDD). It may be configured.
  • FDD frequency division duplex
  • TDD time division duplex
  • the transmission / reception antenna 101 (201), the amplifier unit 102 (202), the transmission / reception unit 103 (203), the transmission path interface 106, and the like described above may be realized by the communication device 1004.
  • 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 (Light Emitting Diode) lamp, etc.) that performs output to the outside.
  • the input device 1005 and the output device 1006 may have an integrated configuration (for example, a touch panel).
  • each device such as the processor 1001 and the memory 1002 is connected by a bus 1007 for communicating information.
  • the bus 1007 may be configured with a single bus or may be configured with different buses between apparatuses.
  • the radio base station 10 and the user terminal 20 include a microprocessor, a digital signal processor (DSP), an ASIC (Application Specific Integrated Circuit), a PLD (Programmable Logic Device), an FPGA (Field Programmable Gate Array), and the like. It may be configured including hardware, and a part or all of each functional block may be realized by the hardware. For example, the processor 1001 may be implemented by at least one of these hardware.
  • DSP digital signal processor
  • ASIC Application Specific Integrated Circuit
  • PLD Programmable Logic Device
  • FPGA Field Programmable Gate Array
  • the channel and / or symbol may be a signal (signaling).
  • the signal may be a message.
  • the reference signal may be abbreviated as RS (Reference Signal), and may be referred to as a pilot, a pilot signal, or the like depending on an applied standard.
  • a component carrier CC: Component Carrier
  • CC Component Carrier
  • the radio frame may be configured with one or a plurality of periods (frames) in the time domain.
  • Each of the one or more periods (frames) constituting the radio frame may be referred to as a subframe.
  • a subframe may be composed of one or more slots in the time domain.
  • the slot may be configured with one or a plurality of symbols (OFDM (Orthogonal Frequency Division Multiplexing) symbol, SC-FDMA (Single Carrier Frequency Division Multiple Access) symbol, etc.) in the time domain).
  • OFDM Orthogonal Frequency Division Multiplexing
  • SC-FDMA Single Carrier Frequency Division Multiple Access
  • the radio frame, subframe, slot, and symbol all represent a time unit when transmitting a signal.
  • Different names may be used for the radio frame, the subframe, the slot, and the symbol.
  • one subframe may be referred to as a transmission time interval (TTI)
  • a plurality of consecutive subframes may be referred to as a TTI
  • one slot may be referred to as a TTI.
  • the subframe or TTI may be a subframe (1 ms) in the existing LTE, a period shorter than 1 ms (for example, 1-13 symbols), or a period longer than 1 ms. Also good.
  • TTI means, for example, a minimum time unit for scheduling in wireless communication.
  • a radio base station performs scheduling to allocate radio resources (frequency bandwidth, transmission power, etc. that can be used in each user terminal) to each user terminal in units of TTI.
  • the definition of TTI is not limited to this.
  • the TTI may be a transmission time unit of a channel-encoded data packet (transport block), or may be a processing unit such as scheduling or link adaptation.
  • a TTI having a time length of 1 ms may be called a normal TTI (TTI in LTE Rel. 8-12), a normal TTI, a long TTI, a normal subframe, a normal subframe, or a long subframe.
  • TTI shorter than a normal TTI may be called a shortened TTI, a short TTI, a shortened subframe, a short subframe, or the like.
  • a resource block is a resource allocation unit in the time domain and the frequency domain, and may include one or a plurality of continuous subcarriers (subcarriers) in the frequency domain. Further, the RB may include one or a plurality of symbols in the time domain, and may have a length of one slot, one subframe, or 1 TTI. One TTI and one subframe may each be composed of one or a plurality of resource blocks.
  • the RB may be called a physical resource block (PRB: Physical RB), a PRB pair, an RB pair, or the like.
  • the resource block may be composed of one or a plurality of resource elements (RE: Resource Element).
  • RE Resource Element
  • 1RE may be a radio resource region of 1 subcarrier and 1 symbol.
  • the structure of the above-described radio frame, subframe, slot, symbol, and the like is merely an example.
  • the configuration such as the cyclic prefix (CP) length can be changed in various ways.
  • information, parameters, and the like described in this specification may be represented by absolute values, may be represented by relative values from a predetermined value, or may be represented by other corresponding information.
  • the radio resource may be indicated by a predetermined index.
  • mathematical formulas and the like using these parameters may differ from those explicitly disclosed herein.
  • PUCCH Physical Uplink Control Channel
  • PDCCH Physical Downlink Control Channel
  • information elements can be identified by any suitable name, so the various channels and information elements assigned to these The name is not limiting in any way.
  • information, signals, etc. can be output from the upper layer to the lower layer and / or from the lower layer to the upper layer.
  • Information, signals, and the like may be input / output via a plurality of network nodes.
  • the input / output information, signals, etc. may be stored in a specific location (for example, a memory), or may be managed by a management table. Input / output information, signals, and the like can be overwritten, updated, or added. The output information, signals, etc. may be deleted. Input information, signals, and the like may be transmitted to other devices.
  • information notification includes physical layer signaling (eg, downlink control information (DCI), uplink control information (UCI)), upper layer signaling (eg, RRC (Radio Resource Control) signaling), It may be implemented by broadcast information (Master Information Block (MIB), System Information Block (SIB), etc.), MAC (Medium Access Control) signaling), other signals, or a combination thereof.
  • DCI downlink control information
  • UCI uplink control information
  • RRC Radio Resource Control
  • MIB Master Information Block
  • SIB System Information Block
  • MAC Medium Access Control
  • the physical layer signaling may be referred to as L1 / L2 (Layer 1 / Layer 2) control information (L1 / L2 control signal), L1 control information (L1 control signal), or the like.
  • the RRC signaling may be referred to as an RRC message, and may be, for example, an RRC connection setup (RRCConnectionSetup) message, an RRC connection reconfiguration (RRCConnectionReconfiguration) message, or the like.
  • the MAC signaling may be notified by, for example, a MAC control element (MAC CE (Control Element)).
  • notification of predetermined information is not limited to explicitly performed, but implicitly (for example, by not performing notification of the predetermined information or another (By notification of information).
  • the determination may be performed by a value represented by 1 bit (0 or 1), or may be performed by a boolean value represented by true or false.
  • the comparison may be performed by numerical comparison (for example, comparison with a predetermined value).
  • software, instructions, information, etc. may be sent and received via a transmission medium.
  • software can use websites, servers using wired technology (coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), etc.) and / or wireless technology (infrared, microwave, etc.) , Or other remote sources, these wired and / or wireless technologies are included within the definition of transmission media.
  • system and “network” used in this specification are used interchangeably.
  • base station BS
  • radio base station eNB
  • cell e.g., a fixed station
  • eNodeB eNodeB
  • cell group e.g., a cell
  • carrier femtocell
  • component carrier e.g., a fixed station, NodeB, eNodeB (eNB), access point, transmission point, reception point, femtocell, and small cell.
  • the base station can accommodate one or a plurality of (for example, three) cells (also called sectors). If the base station accommodates multiple cells, the entire coverage area of the base station can be partitioned into multiple smaller areas, each smaller area being a base station subsystem (eg, an indoor small base station (RRH: The term “cell” or “sector” refers to part or all of the coverage area of a base station and / or base station subsystem that provides communication service in this coverage. Point to.
  • RRH indoor small base station
  • MS mobile station
  • UE user equipment
  • terminal may be used interchangeably.
  • a base station may also be called in terms such as a fixed station, NodeB, eNodeB (eNB), access point, transmission point, reception point, femtocell, and small cell.
  • NodeB NodeB
  • eNodeB eNodeB
  • access point transmission point
  • reception point femtocell
  • small cell small cell
  • a mobile station is defined by those skilled in the art as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless It may also be called terminal, remote terminal, handset, user agent, mobile client, client or some other suitable terminology.
  • the radio base station in this specification may be read by the user terminal.
  • each aspect / embodiment of the present invention may be applied to a configuration in which communication between a radio base station and a user terminal is replaced with communication between a plurality of user terminals (D2D: Device-to-Device).
  • the user terminal 20 may have a function that the wireless base station 10 has.
  • words such as “up” and “down” may be read as “side”.
  • the uplink channel may be read as a side channel.
  • a user terminal in this specification may be read by a radio base station.
  • the wireless base station 10 may have a function that the user terminal 20 has.
  • the specific operation assumed to be performed by the base station may be performed by the upper node in some cases.
  • various operations performed for communication with a terminal may be performed by one or more network nodes other than the base station and the base station (for example, It is obvious that this can be done by MME (Mobility Management Entity), S-GW (Serving-Gateway), etc., but not limited thereto) or a combination thereof.
  • MME Mobility Management Entity
  • S-GW Serving-Gateway
  • each aspect / embodiment described in this specification may be used alone, in combination, or may be switched according to execution.
  • the order of the processing procedures, sequences, flowcharts, and the like of each aspect / embodiment described in this specification may be changed as long as there is no contradiction.
  • the methods described herein present the elements of the various steps in an exemplary order and are not limited to the specific order presented.
  • Each aspect / embodiment described herein includes LTE (Long Term Evolution), LTE-A (LTE-Advanced), LTE-B (LTE-Beyond), SUPER 3G, IMT-Advanced, 4G (4th generation mobile). communication system), 5G (5th generation mobile communication system), FRA (Future Radio Access), New-RAT (Radio Access Technology), NR (New Radio), NX (New radio access), FX (Future generation radio access), GSM (registered trademark) (Global System for Mobile communications), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802 .20, UWB (Ultra-WideBand), Bluetooth (registered trademark), The present invention may be applied to a system using other appropriate wireless communication methods and / or a next generation system extended based on these.
  • the phrase “based on” does not mean “based only on”, unless expressly specified otherwise. In other words, the phrase “based on” means both “based only on” and “based at least on.”
  • any reference to elements using designations such as “first”, “second”, etc. as used herein does not generally limit the amount or order of those elements. These designations can be used herein as a convenient way to distinguish between two or more elements. Thus, reference to the first and second elements does not mean that only two elements can be employed or that the first element must precede the second element in some way.
  • determining may encompass a wide variety of actions. For example, “determination” means calculating, computing, processing, deriving, investigating, looking up (eg, table, database or other data). It may be considered to “judge” (search in structure), ascertaining, etc.
  • “determination (decision)” includes receiving (for example, receiving information), transmitting (for example, transmitting information), input (input), output (output), access ( accessing) (e.g., accessing data in memory), etc. may be considered to be “determining”. Also, “determination” is considered to be “determination (resolving)”, “selecting”, “choosing”, “establishing”, “comparing”, etc. Also good. That is, “determination (determination)” may be regarded as “determination (determination)” of some operation.
  • the terms “connected”, “coupled”, or any variation thereof refers to any direct or indirect connection between two or more elements or By coupling, it can include the presence of one or more intermediate elements between two elements that are “connected” or “coupled” to each other.
  • the coupling or connection between the elements may be physical, logical, or a combination thereof.
  • the two elements are radio frequency by using one or more wires, cables and / or printed electrical connections, and as some non-limiting and non-inclusive examples
  • electromagnetic energy such as electromagnetic energy having a wavelength in the region, microwave region, and light (both visible and invisible) region, it can be considered to be “connected” or “coupled” to each other.

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

Abstract

La présente invention concerne un terminal utilisateur permettant de commander de manière appropriée une transmission UL même lorsqu'un TTI court est utilisé pour transmettre des données de liaison montante et un signal de référence de démodulation, le terminal utilisateur comprenant : une unité de transmission qui utilise le même intervalle de temps de transmission ou différents intervalles de temps de transmission pour transmettre un signal UL et un signal de référence UL destiné à être utilisé pour démoduler le signal UL ; et une unité de commande qui commande la génération et/ou la puissance de transmission du signal UL et du signal de référence UL. L'unité de commande applique un schéma de modulation prescrit au signal UL et/ou applique la même puissance de transmission au signal UL et au signal de référence UL.
PCT/JP2017/008375 2017-03-02 2017-03-02 Terminal utilisateur et procédé de communication sans fil Ceased WO2018158925A1 (fr)

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PCT/JP2017/008375 WO2018158925A1 (fr) 2017-03-02 2017-03-02 Terminal utilisateur et procédé de communication sans fil
CN201780089986.6A CN110583062B (zh) 2017-03-02 2017-03-02 用户终端以及无线通信方法
JP2019502398A JPWO2018158925A1 (ja) 2017-03-02 2017-03-02 ユーザ端末及び無線通信方法

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CN113170501A (zh) * 2018-09-27 2021-07-23 株式会社Ntt都科摩 用户终端以及无线通信方法
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CN113491149A (zh) * 2019-03-06 2021-10-08 株式会社Ntt都科摩 网络节点
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US11985669B2 (en) 2021-04-19 2024-05-14 Qualcomm Incorporated Demodulation using demodulation reference signals from multiple component carriers

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