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WO2018043560A1 - Terminal d'utilisateur, et procédé de communication sans fil - Google Patents

Terminal d'utilisateur, et procédé de communication sans fil Download PDF

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Publication number
WO2018043560A1
WO2018043560A1 PCT/JP2017/031151 JP2017031151W WO2018043560A1 WO 2018043560 A1 WO2018043560 A1 WO 2018043560A1 JP 2017031151 W JP2017031151 W JP 2017031151W WO 2018043560 A1 WO2018043560 A1 WO 2018043560A1
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WIPO (PCT)
Prior art keywords
downlink
subframe
signal
reference signal
uplink
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PCT/JP2017/031151
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English (en)
Japanese (ja)
Inventor
良介 大澤
浩樹 原田
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NTT Docomo Inc
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NTT Docomo Inc
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/06—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information

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
  • LTE-A also referred to as LTE Advanced, LTE Rel. 10, 11 or 12
  • LTE has been specified for the purpose of further widening and speeding up from LTE (also referred to as LTE Rel. 8 or 9), and LTE.
  • Successor systems for example, FRA (Future Radio Access), 5G (5th generation mobile communication system), NR (New Radio), NX (New radio access), FX (Future generation radio access), LTE Rel. 13, 14 or Also referred to as after 15).
  • CA Carrier Aggregation
  • CC Component Carrier
  • UE User Equipment
  • DC dual connectivity
  • CG Cell Group
  • CC cell
  • Inter-eNB CA inter-base station CA
  • LTE Rel. frequency division duplex (FDD) in which downlink (DL) transmission and uplink (UL: Uplink) transmission are performed in different frequency bands, and downlink transmission and uplink transmission are in the same frequency band.
  • Time Division Duplex (TDD) which is performed by switching over time, is introduced.
  • E-UTRA Evolved Universal Terrestrial Radio Access
  • E-UTRAN Evolved Universal Terrestrial Radio Access Network
  • Future wireless communication systems for example, 5G, NR are expected to realize various wireless communication services to meet different requirements (for example, ultra-high speed, large capacity, ultra-low delay, etc.) Yes.
  • M2M may be referred to as D2D (Device To Device), V2V (Vehicle To Vehicle), or the like depending on a device to communicate. Designing a new communication access method (New RAT (Radio Access Technology)) is being studied in order to satisfy the above-mentioned various communication requirements.
  • New RAT Radio Access Technology
  • New RAT Radio Access Technology
  • precoding that performs appropriate phase and / or amplitude adjustment on a transmission signal.
  • the transmission side uses propagation path information (information on propagation path) from the transmission side to the reception side in order to obtain an appropriate weight (precoding weight).
  • a conventional method for acquiring propagation path information there is a method in which the transmission side acquires propagation path information by feeding back the propagation path information obtained by measurement on the reception side to the transmission side.
  • the conventional acquisition method of propagation path information requires a time of several subframes or more, when it is used in 5G considered to be used in various environments, the propagation path information fed back due to a rapid change in channel state or the like. Precoding based on may be inappropriate. In this case, problems such as a decrease in communication throughput and a deterioration in reception quality occur.
  • the present invention has been made in view of such a point, and an object of the present invention is to provide a user terminal and a wireless communication method capable of acquiring propagation path information in a shorter time than an existing LTE system.
  • a user terminal is a user terminal that wirelessly communicates with a base station, such that at least one of the transmission / reception unit that transmits and receives signals and the base station and the user terminal acquires propagation path information.
  • a control unit that controls transmission / reception, and the transmission / reception unit transmits an uplink reference signal and receives a downlink reference signal within a predetermined period, while receiving a downlink feedback signal based on the uplink reference signal. At least one of reception and transmission of an uplink feedback signal based on the downlink reference signal is performed.
  • the propagation path information can be acquired in a shorter time compared with the existing LTE system.
  • FIG. 4A to 4F are diagrams illustrating examples of signal configurations of subframes according to the first embodiment.
  • 5A to 5C are diagrams illustrating an example of a signal configuration of a subframe according to the second embodiment.
  • 6A-6D are diagrams showing a modification of the first embodiment.
  • 7A-7D are diagrams showing another modification of the first embodiment.
  • 8A and 8B are diagrams illustrating an example of a self-contained subframe configuration.
  • 9A to 9D are diagrams illustrating an example in which the FB subframe is configured with DL data subframes.
  • 10A to 10D are diagrams illustrating an example in which the FB subframe is configured with a UL data subframe. It is a figure which shows an example of schematic structure of the radio
  • BF beam forming
  • BF is a technique for forming a beam (antenna directivity) by controlling the amplitude and / or phase of a signal transmitted / received from each element using, for example, a super multi-element antenna.
  • MIMO Multiple Input Multiple Output
  • MIMO Multiple Input Multiple Output
  • massive MIMO Massive MIMO
  • BF makes it possible to reduce the difficulty of securing coverage due to an increase in carrier frequency and reduce radio wave propagation loss.
  • Digital BF can be classified into digital BF and analog BF.
  • Digital BF is a method of performing precoding signal processing (for a digital signal) on baseband.
  • IFFT Inverse Fast Fourier Transform
  • DAC Digital to Analog Converter
  • RF Radio Frequency
  • IFFT Inverse Fast Fourier Transform
  • DAC Digital to Analog Converter
  • RF Radio Frequency
  • Analog BF is a method using a phase shifter on RF. In this case, since only the phase of the RF signal is rotated, the configuration is easy and can be realized at low cost, but a plurality of beams cannot be formed at the same timing.
  • a hybrid BF configuration combining a digital BF and an analog BF can also be realized.
  • future wireless communication systems for example, 5G
  • introduction of large-scale MIMO is being studied.
  • the circuit configuration becomes expensive. For this reason, it is assumed that a hybrid BF configuration is used in 5G.
  • the transmitting side transmits propagation path information from the transmitting side to the receiving side. It is necessary to make appropriate phase and amplitude adjustments based on Uplink channel information is important for UE transmit beamforming, and downlink channel information is important for base station transmit beamforming.
  • SINR Signal to Interference plus Noise Ratio
  • the propagation path information is, for example, channel state information (CSI: Channel State Information), information on a channel matrix, and the like.
  • CSI Channel State Information
  • the propagation path information may include the transceiver characteristics of the UE and the base station, the phase and / or amplitude adjustment results for beam formation, and the like.
  • the transceiver characteristics refer to, for example, frequency characteristics (for example, phase and / or amplitude characteristics) of the transceiver.
  • the CSI is estimated (measured) based on a reference signal (RS) received in a predetermined subframe, and the CSI is fed back in another subframe, so that a direct propagation path is established on the transmission side. Transmission that reflects propagation path information can be performed without estimation. A specific description will be given with reference to FIGS.
  • FIG. 1 is a sequence diagram illustrating an example in which a UE applies precoding to UL transmission using uplink channel information.
  • the UE transmits an uplink reference signal (UL RS) at a predetermined timing (step S101).
  • the uplink reference signal may be a channel measurement reference signal (for example, an uplink measurement reference signal (SRS: Sounding Reference Signal)) or a separately defined reference signal (for example, a beam-specific reference signal). It may be a beam-specific reference signal (BRS: Beam-specific Reference Signal).
  • the base station derives uplink propagation path information based on the uplink reference signal transmitted from the UE, and feeds back the information to the UE (step S102). For example, in step S102, the base station determines an appropriate precoding matrix index (PMI), precoding type index (PTI), rank index (PMI) from the CSI obtained as uplink channel information. RI: Rank Indicator) etc. may be selected and notified to the UE.
  • PMI precoding matrix index
  • PTI precoding type index
  • PMI rank index
  • RI Rank Indicator
  • the UE determines precoding based on the received propagation path information, and transmits a UL signal (for example, a UL data signal) (step S103). For example, the UE uses a precoding weight specified based on the notified RI and TPMI for transmission.
  • FIG. 2 is a sequence diagram showing an example in which the base station applies precoding to DL transmission using downlink propagation path information.
  • the base station transmits a downlink reference signal (DL RS) at a predetermined timing (step S201).
  • the downlink reference signal may be a channel measurement reference signal (for example, a channel state information reference signal (CSI-RS: Channel State Information-Reference Signal)) or a separately defined reference signal (for example, BRS).
  • CSI-RS Channel State Information-Reference Signal
  • the UE derives downlink propagation path information based on the downlink reference signal transmitted from the base station, and feeds back the information to the base station (step S202). For example, in step S202, the UE may select a channel quality indicator (CQI: Channel Quality Indicator), PMI, RI, etc. from the CSI obtained as downlink channel information, and notify the base station.
  • CQI Channel Quality Indicator
  • the base station determines precoding based on the received propagation path information, and transmits a DL signal (for example, a DL data signal) (step S203). For example, the base station determines a rank (RI) and a weight (PMI) based on the notified CQI, and uses the determined rank and weight for transmission.
  • a DL signal for example, a DL data signal
  • FIG. 3 is a sequence diagram illustrating an example in which the UE acquires uplink channel information using analog feedback.
  • the UE transmits an uplink reference signal at a predetermined timing (step S301).
  • the base station transmits the uplink reference signal received in step S301 to the return UE (step S302).
  • the UE measures the uplink reference signal that is transmitted in return, and acquires round-trip propagation path information H Round (step S303).
  • the base station transmits a downlink reference signal to the UE (step S304).
  • UE measures the downlink reference signal to obtain a downlink channel state information H DL (step S305).
  • H UL H DL -1 H Round
  • the round-trip propagation path information estimation in steps S301 to S303 and the downlink propagation path information estimation in steps S304 to S305 are in no particular order. Moreover, according to the aspect which replaces a base station and UE, the estimation of the downlink propagation path in a base station is possible similarly.
  • analog feedback can be considered in order to suppress an increase in feedback amount.
  • the use of analog feedback has not been studied for LTE. For example, it is necessary to consider a physical channel used for analog feedback.
  • the present inventors have conceived a subframe configuration for completing propagation path estimation by analog feedback in a short time (for example, one subframe).
  • the UE transmits an uplink reference signal and receives a downlink reference signal, while receiving a downlink feedback signal based on the uplink reference signal and an uplink feedback signal based on the downlink reference signal.
  • a subframe that performs at least one may be referred to as a feedback subframe (FB subframe), an analog feedback subframe, or the like.
  • the first embodiment of the present invention relates to an FB subframe configuration for uplink channel estimation.
  • the uplink reference signal (UL RS) is transmitted by the UE
  • the analog feedback (DL FB) of the uplink reference signal by the base station (DL FB reception by the UE)
  • the downlink reference signal by the base station (DL RS) transmission (reception of DL RS by UE) is performed in the same subframe.
  • the DL FB needs to be transmitted after receiving the RS (UL RS) to be fed back, but the order of the UL RS, DL RS, and DL FB may be changed as long as this is satisfied.
  • FIG. 4 is a diagram illustrating an example of a signal configuration of a subframe according to the first embodiment.
  • FIG. 4 shows a signal configuration for performing uplink channel estimation in one subframe using a TDD carrier.
  • DL control CH period DL control channel transmission period
  • non-transmission period for example, guard interval (GI), guard period (GP), guard period
  • gap switching gap, etc.
  • FB subframes are configured in the order of UL RS transmission period (UL RS period), DL FB transmission period (DL FB period), and DL RS transmission period (DL RS period). Yes.
  • the DL control channel may be, for example, a PDCCH (Physical Downlink Control Channel), EPDCCH (Enhanced PDCCH), or a newly defined control channel.
  • a control signal related to the FB subframe including the control channel may be transmitted.
  • information on the configuration of the FB subframe may be notified to the UE.
  • the information regarding the length of the period for example, the first symbol position, the last symbol position, the number of symbols, the symbol length, and the like of the period may be notified.
  • information for identifying at least one reference signal configuration of UL RS, DL FB, and DL RS may be transmitted.
  • information regarding whether or not a subframe including the control channel is an FB subframe information regarding the timing (for example, period, offset, etc.) of the FB subframe may be transmitted.
  • the UE may determine the FB subframe configuration and / or the reference signal configuration based on the received information. Note that at least one period of the FB subframe may not be dynamically controlled. For example, a part of the period may be fixedly used in advance. For example, the UE and / or the base station performs transmission and / or reception processing on the assumption that at least the first symbol is a control channel. May be.
  • Information related to the configuration of the FB subframe, information for specifying the reference signal configuration, information about availability (presence / absence) of the FB subframe, information about the timing of the FB subframe, and the like are at least partly higher layer signaling (for example, It may be notified by RRC (Radio Resource Control) signaling, broadcast information (MIB (Master Information Block), SIB (System Information Block), etc.), or by using a combination of higher layer signaling and physical layer signaling. Good.
  • RRC Radio Resource Control
  • MIB Master Information Block
  • SIB System Information Block
  • FIG. 4B and 4C are modified configurations of FIG. 4A.
  • one subframe is configured in the order of the control CH period, GI, UL RS period, DL RS period, and DL FB period.
  • one subframe is configured in the order of control CH period, GI, UL RS period, DL RS period, and DL FB period.
  • one subframe is configured in the order of the control CH period, DL RS period, GI, UL RS period, and DL FB period.
  • 4D, 4E, and 4F are modified configurations of FIGS. 4A, 4B, and 4C, respectively, and a GI is provided at the end of the subframe. Due to the presence of the GI at the end, interference when the next subframe starts with UL transmission can be avoided.
  • the UL RS period and the DL FB period be close to each other from the viewpoint of followability to channel fluctuation. If no collision occurs even without GI, it is preferable to reduce GI.
  • the subframe configuration of the TDD carrier is shown in FIG. 4, it is not limited to this.
  • the control CH, DL FB, and DL RS may be transmitted / received by the DL carrier, and the UL RS may be transmitted / received by one subframe of the UL carrier.
  • GI since GI is unnecessary, frequency utilization efficiency can be improved.
  • the TDD carrier is configured to perform TDM on the DL FB and DL RS, but the present invention is not limited to this.
  • DL RS may be FDM with UL RS and / or DL FB.
  • a signal necessary for uplink propagation path estimation based on analog feedback can be transmitted and received within one subframe. Since a more accurate CSI can be obtained in a short time with a small amount of feedback traffic, resistance to propagation path fluctuations can be increased.
  • the second embodiment of the present invention relates to a subframe configuration for downlink propagation path estimation.
  • transmission of a downlink reference signal (DL RS) by the base station (reception of DL RS by the UE), analog feedback (UL FB) of the uplink reference signal by the UE, and uplink reference signal (UL by the UE) RS) transmission is performed in the same subframe.
  • DL RS downlink reference signal
  • UL FB analog feedback
  • UL by the UE uplink reference signal
  • UL FB needs to be transmitted after receiving RS (DL RS) to be fed back, but as long as this is satisfied, the order of DL RS, UL RS, and UL FB may be changed.
  • DL RS RS
  • FIG. 5 is a diagram illustrating an example of a signal configuration of a subframe according to the second embodiment.
  • FIG. 5 shows a signal configuration for performing downlink propagation channel estimation in one subframe using a TDD carrier.
  • one subframe is configured in the order of DL control CH period, DL RS period, GI, UL FB transmission period (UL FB period), and UL RS period.
  • a control signal related to a subframe including the control channel may be transmitted.
  • information regarding the configuration of the FB subframe may be notified, or information for specifying at least one reference signal configuration of DL RS, UL FB, and UL RS may be notified. These pieces of information may be notified by higher layer signaling.
  • the UE may determine the FB subframe configuration and / or the reference signal configuration based on the received information.
  • FIG. 5B and 5C are modified configurations of FIG. 5A.
  • one subframe is configured in the order of DL control CH period, DL RS period, GI, UL RS period, and UL FB period.
  • one subframe is configured in the order of the control CH period, GI, UL RS period, DL RS period, and UL FB period.
  • the DL RS period and the UL FB period be close to each other from the viewpoint of followability to propagation path fluctuations. If no collision occurs even without GI, it is preferable to reduce GI.
  • the subframe configuration of the TDD carrier is shown in FIG. 5, it is not limited to this.
  • the control CH and DL RS may be transmitted / received by the DL carrier
  • the UL RS and UL FB may be transmitted / received by one subframe of the UL carrier.
  • GI since GI is unnecessary, frequency utilization efficiency can be improved.
  • UL RS may be FDM with DL RS and / or UL FB.
  • signals necessary for downlink propagation path estimation based on analog feedback can be transmitted and received within one subframe. Since a more accurate CSI can be obtained in a short time with a small amount of feedback traffic, resistance to propagation path fluctuations can be increased.
  • the channel used for FB may be different from the channel used for the corresponding RS reception.
  • UL RS and DL FB (or DL RS and UL FB) have a start frequency (for example, specified by a resource block index), a frequency bandwidth (for example, specified by the number of resource blocks), and a carrier (for example, CC). May be different.
  • the symbol length used for feedback may be shorter than the symbol length of the received RS. That is, analog feedback may be performed using a part of the received RS. In this case, the amount of resources required for FB can be reduced.
  • analog feedback is always transmitted in a subframe in which RS is received.
  • the present invention is not limited to this.
  • the UE and / or the base station may control transmission / reception of feedback based on information regarding the feedback instruction.
  • Information related to the feedback instruction includes upper layer signaling (for example, RRC signaling, MAC signaling (MAC control element, etc.), broadcast information), physical layer signaling (for example, DCI, uplink control information (UCI)), or these
  • the combination may be notified from the base station to the UE (and / or from the UE to the base station). Further, the UE / base station may assume that feedback is always performed in a subframe in which a predetermined RS is transmitted and / or received when information regarding the feedback instruction is not notified.
  • the information related to the feedback instruction may be information (for example, 1-bit information) indicating the presence or absence of feedback in a subframe in which a predetermined RS is transmitted and / or received.
  • feedback may be performed in a subframe different from a subframe for transmitting and / or receiving a predetermined RS.
  • feedback is performed using information specifying a subframe for feedback (for example, a subframe index, a subframe offset, etc.) and a predetermined RS that has been transmitted and / or received in the past as information regarding the feedback instruction. Information indicating this may be notified.
  • feedback may be performed in a subframe after a certain period of time has elapsed from the subframe in which a predetermined RS is transmitted and / or received (for example, after one subframe).
  • the feedback signal may be an analog signal obtained by amplifying the RS reception signal, or A / D (analog / digital) conversion of the RS reception signal, and after processing such as amplification and noise reduction, D / A conversion is performed. It may be a signal. Further, as long as the signal to be fed back is based on the received signal of RS, other transmission processing may be applied.
  • the FB subframe may be configured not to include the control CH. In this case, since switching from DL to UL can be reduced, GI becomes unnecessary.
  • FIG. 6 is a diagram showing a modification of the first embodiment. 6A, 6B, 6C, and 6D correspond to subframe configurations excluding the DL control CH and GI of FIGS. 4A, 4B, 4D, and 4E, respectively.
  • the configuration in which the DL control CH is transmitted at the head of the FB subframe is shown, but the present invention is not limited to this.
  • at least one of UL RS, DL FB (UL FB), and DL RS may be transmitted before the DL control CH.
  • UL FB DL FB
  • DL RS may be transmitted before the DL control CH.
  • FIG. 7 is a diagram showing another modification of the first embodiment.
  • 7A, 7B, 7C, and 7D correspond to subframe configurations in which the UL RS period of FIGS. 4A, 4B, 4D, and 4E is located before the DL control CH period, respectively.
  • the feedback (FB period) timing may be indicated by the DL control CH of the same subframe.
  • information related to the configuration of the subframes described above, information for specifying the reference signal configuration, and the like may be notified by higher layer signaling (for example, RRC signaling), or control of subframes prior to the FB subframe. It may be notified by CH (physical layer signaling) or may be defined in the specification.
  • the present inventors further studied a configuration in which signals other than those shown in the first and second embodiments are transmitted in the FB subframe.
  • the self-contained subframe is a subframe configured such that data transmission and / or reception control (scheduling) is completed within the subframe.
  • a self-contained subframe feedback with ultra-low delay of, for example, 1 ms (existing LTE normal subframe) or less can be realized, and communication in a shorter time than conventional LTE is possible.
  • One self-contained subframe includes, for example, a DL control CH period in which transmission and / or reception of downlink control information is performed, a data CH period in which transmission and / or reception of data based on the downlink control information is performed, and an uplink It includes a UL control CH period in which control information (for example, feedback information corresponding to data) is transmitted and / or received, a GI for DL / UL switching, and the like.
  • FIG. 8 is a diagram illustrating an example of a self-contained subframe configuration.
  • FIG. 8A shows an example of radio resource allocation related to a self-contained subframe for DL data (for DL data transmission).
  • a UE that uses a self-contained subframe for DL data receives scheduling information (DL assignment) using a downlink control channel (eg, PDCCH) in the DL control CH period, and assigns the DL assignment in the data CH period. Data is received based on this, and an uplink control signal (for example, ACK / NACK) is transmitted in response to reception of the data in the UL control CH period.
  • DL assignment scheduling information
  • PDCCH downlink control channel
  • ACK / NACK uplink control signal
  • FIG. 8B shows an example of radio resource allocation related to a self-contained subframe for UL data (for UL data transmission).
  • the UE using the self-contained subframe for UL data receives the scheduling information (UL grant) in the DL control CH period, transmits data based on the UL grant in the data CH period, and further in the UL control CH period.
  • An uplink control signal (for example, ACK / NACK in another subframe) is transmitted.
  • the self-contained subframe may be a subframe in which the DL control CH period and the UL control CH period in FIG.
  • the self-contained subframe for DL data and the self-contained subframe for UL data are also simply referred to as a DL data subframe and a UL data subframe, respectively.
  • FIG. 9 is a diagram showing an example in which the FB subframe is composed of DL data subframes.
  • 9A and 9B show an example of a subframe configuration for uplink channel estimation.
  • the UE transmits UL RS on the UL control CH at the end of the first subframe in two consecutive DL data subframes, and DL FB on the DL control CH at the top of the second subframe.
  • DL RS are received. That is, two adjacent DL data subframes in FIG. 9A include a configuration corresponding to the FB subframe in FIG. 6A.
  • the UE transmits UL RS on the UL control CH at the end of the first subframe in two consecutive DL data subframes, and DL FB at the head of the data CH in the second subframe. And DL RS are received. That is, two adjacent DL data subframes in FIG. 9B include a configuration corresponding to the FB subframe in FIG. 7A.
  • the UE may receive one of DL FB and DL RS on the control CH of the second subframe and the other on the data CH of the second subframe. Good.
  • FIGS. 9C and 9D show an example of a subframe configuration for downlink propagation path estimation.
  • the UE in the DL data subframe, receives the DL RS with the first DL control CH, and transmits the UL FB and UL RS with the last UL control CH.
  • the UE in the DL data subframe, receives the DL RS with the data CH and transmits the UL FB and the UL RS with the last UL control CH.
  • the DL data subframes in FIGS. 9C and 9D correspond to the FB subframe in FIG. 5A.
  • analog feedback can be performed without reducing the resources of DL data CH, so that a decrease in communication throughput can be suppressed.
  • the UE may receive the scheduling information of the second subframe on the DL control CH of the first subframe.
  • FIG. 10 is a diagram showing an example in which the FB subframe is composed of UL data subframes.
  • 10A and 10B show an example of a subframe configuration for uplink channel estimation.
  • the UE transmits UL RS on the UL control CH at the end of the first subframe in two consecutive UL data subframes, and DL FB on the DL control CH at the top of the second subframe. And DL RS are received. That is, two adjacent UL data subframes in FIG. 10A include a configuration corresponding to the FB subframe in FIG. 6A.
  • the UE transmits UL RS at the end of the data CH of the first subframe in two consecutive UL data subframes, and transmits the DL FB and DL FB on the DL control CH of the second subframe.
  • Receive DL RS That is, two adjacent DL data subframes in FIG. 10B include a configuration corresponding to the FB subframe in FIG. 7A.
  • FIGS. 10C and 10D show an example of a subframe configuration for downlink propagation path estimation.
  • the UE in the UL data subframe, receives the DL RS on the leading DL control CH and transmits the UL FB and UL RS on the trailing UL control CH.
  • the UE in the UL data subframe, receives the DL RS with the head DL control CH and transmits the UL FB and the UL RS at the end of the data CH. Therefore, the DL data subframes in FIGS. 10C and 10D correspond to the FB subframe in FIG. 5A.
  • the UE may transmit one of UL FB and UL RS using the data CH and the other using the UL control CH.
  • analog feedback can be performed without reducing the resources of UL data CH, so that a decrease in communication throughput can be suppressed.
  • the UE may receive the scheduling information of the second subframe on the DL control CH of the first subframe.
  • RS and / or FB may or may not be transmitted simultaneously with the control signal, the data signal, and the like.
  • FIGS. 9 and 10 show an example in which a plurality of (for example, two) self-contained subframes are used for uplink propagation path estimation and one self-contained subframe is used for downlink propagation path estimation.
  • I can't.
  • the DL data subframe and the UL data subframe may be freely combined to perform transmission / reception so as to include a configuration corresponding to the FB subframe as shown in FIGS.
  • analog feedback may be realized in adjacent DL data subframes and UL data subframes.
  • the first subframe of FIGS. 9A and 9B may be a UL data subframe, and the UE may transmit UL RS using the UL data CH and / or UL control CH of the subframe.
  • the second subframe in FIG. 9A may be a UL data subframe, and the UE may receive DL FB and DL RS on the DL control CH at the head of the subframe.
  • the first subframe in FIG. 10A may be a DL data subframe, and the UE may transmit UL RS on the UL control CH at the end of the subframe.
  • 10A and 10B may be a DL data subframe, and the UE receives DL FB and DL RS using the DL control CH and / or DL data CH at the head of the subframe. May be.
  • Analog feedback may be performed using two or more discontinuous (time-separated) subframes.
  • the second subframe may be one or more subframes after the first subframe. If the subframe immediately after the first subframe is already assigned to another application and cannot be used for analog feedback, two or more subsequent subframes may be used.
  • the subframe is a subframe (transmission time interval (TTI) having a time length of 1 ms) in the existing LTE (for example, LTE Rel. 8-12).
  • TTI transmission time interval
  • the period may be shorter than 1 ms (for example, 1-13 symbols) or may be longer than 1 ms.
  • a TTI shorter than 1 ms may be referred to as a shortened TTI.
  • Both uplink channel estimation and downlink channel estimation may be performed in consecutive subframes. For example, consider a case where uplink propagation path estimation is performed using the FB subframe configuration of FIG. 4 in the first subframe and downlink propagation path estimation is performed using the FB subframe configuration of FIG. 5 in the second subframe. . In this case, since the UL FB based on the DL RS transmitted in the first subframe can be transmitted in the second subframe, it is not necessary to transmit the DL RS in the second subframe. Moreover, since UL RS is transmitted in the first subframe, it is not necessary to transmit UL RS in the second subframe.
  • RS transmission can be reduced by using a combination of the uplink propagation path estimation FB subframe configuration and the downlink propagation path estimation FB subframe configuration described in the above embodiment. Also, communication throughput can be improved by using reduced resources for user data transmission. Similarly, when the downlink propagation path estimation is performed in the first subframe and the uplink propagation path estimation is performed in the second subframe, the signal can be similarly reduced.
  • each of the above-described embodiments may be used for acquiring propagation path information, and precoding based on propagation path information may not be performed.
  • precoding based on propagation path information is not limited to MIMO, and may be used for Coordinated Multi-Point (CoMP) transmission / reception.
  • CoMP Coordinated Multi-Point
  • wireless communication system Wireless communication system
  • communication is performed using any one or a combination of the wireless communication methods according to the above embodiments of the present invention.
  • FIG. 11 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment of the present invention.
  • 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. can do.
  • DC dual connectivity
  • the wireless communication system 1 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), etc., or a system that realizes these.
  • LTE Long Term Evolution
  • LTE-A Long Term Evolution-Advanced
  • LTE-B LTE-Beyond
  • SUPER 3G IMT-Advanced 4G (4th generation mobile communication system)
  • 5G. 5th generation mobile communication system
  • FRA Full Radio Access
  • New-RAT Radio Access Technology
  • the radio communication system 1 includes a radio base station 11 that forms a macro cell C1 having a relatively wide coverage, and a radio base station 12 (12a-12c) that is arranged in the macro cell C1 and forms a small cell C2 that is narrower than the macro cell C1. It is equipped with. Moreover, the user terminal 20 is arrange
  • 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 simultaneously by CA or DC. Moreover, the user terminal 20 may apply CA or DC using a plurality of cells (CC) (for example, 5 or less CCs, 6 or more CCs).
  • CC 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 (also referred to as an existing carrier or a legacy carrier).
  • a carrier having a relatively high frequency band for example, 3.5 GHz, 5 GHz, etc.
  • the same carrier 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 that supports various communication schemes such as LTE and LTE-A, and may include not only a mobile communication terminal (mobile station) but also a fixed communication terminal (fixed station).
  • orthogonal frequency division multiple access (OFDMA) is applied to the downlink, and single carrier-frequency division multiple access (SC-FDMA) is used for the uplink.
  • 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 other radio access schemes may be used.
  • downlink channels include a downlink shared channel (PDSCH) shared by each user terminal 20, a broadcast channel (PBCH: Physical Broadcast Channel), a downlink L1 / L2 control channel, and the like. Used. User data, higher layer control information, SIB (System Information Block), etc. are transmitted by PDSCH. Also, MIB (Master Information Block) is transmitted by PBCH.
  • PDSCH downlink shared channel
  • PBCH Physical Broadcast Channel
  • SIB System Information Block
  • MIB Master Information Block
  • Downlink L1 / L2 control channels include PDCCH (Physical Downlink Control Channel), EPDCCH (Enhanced Physical Downlink Control Channel), PCFICH (Physical Control Format Indicator Channel), PHICH (Physical Hybrid-ARQ Indicator Channel), and the like.
  • 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 PHICH transmits HARQ (Hybrid Automatic Repeat reQuest) acknowledgment information (for example, retransmission control information, HARQ-ACK, ACK / NACK, etc.) to the PUSCH.
  • HARQ Hybrid Automatic Repeat reQuest
  • 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.
  • an uplink shared channel (PUSCH) shared by each user terminal 20
  • an uplink control channel (PUCCH: Physical Uplink Control Channel)
  • a random access channel (PRACH: Physical Random Access Channel)
  • User data, higher layer control information, etc. are transmitted by PUSCH.
  • downlink radio quality information (CQI: Channel Quality Indicator), delivery confirmation information, and the like are transmitted by PUCCH.
  • CQI Channel Quality Indicator
  • delivery confirmation information and the like are transmitted by PUCCH.
  • a random access preamble for establishing connection with a cell is transmitted by the PRACH.
  • a cell-specific reference signal CRS
  • CSI-RS channel state information reference signal
  • DMRS demodulation reference signal
  • PRS Positioning Reference Signal
  • a measurement reference signal SRS: Sounding Reference Signal
  • a demodulation reference signal DMRS
  • the DMRS may be referred to as a user terminal specific reference signal (UE-specific Reference Signal). Further, the transmitted reference signal is not limited to these.
  • FIG. 12 is a diagram illustrating an example of the overall configuration of a radio base station according to an embodiment of the present invention.
  • 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.
  • User data transmitted from the radio base station 10 to the user terminal 20 via the downlink 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 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, and other transmission processing
  • the downlink 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 uplink 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: Inverse Discrete Fourier Transform) processing, and error correction on user data included in the input upstream signal.
  • FFT fast Fourier transform
  • IDFT inverse discrete Fourier transform
  • 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 processor 105 performs communication channel call processing (setting, release, etc.), status management of the radio base station 10, radio resource management, and the like.
  • 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 may further include an analog beam forming unit that performs analog beam forming.
  • the analog beam forming unit includes an analog beam forming circuit (for example, phase shifter, phase shift circuit) or an analog beam forming apparatus (for example, phase shifter) described based on common recognition in the technical field according to the present invention. May be.
  • the transmission / reception antenna 101 may be constituted by an array antenna, for example.
  • the transmission / reception unit 103 receives an uplink reference signal and transmits a downlink reference signal within a predetermined period (for example, one subframe), while transmitting a downlink feedback signal based on the uplink reference signal and the downlink reference signal. At least one of the reception of the uplink feedback signal based on the above may be performed.
  • the transmission / reception unit 103 does not transmit the downlink control channel in a predetermined period, and continuously receives the uplink reference signal, the downlink reference signal, the downlink feedback signal, or the uplink feedback signal (GI). You can go without).
  • the transmission / reception unit 103 may transmit a downlink control channel in a predetermined period, and may receive an uplink reference signal before transmission of the downlink control channel.
  • the transmission / reception unit 103 uses the uplink reference signal and uplink if any A feedback signal is received on an uplink control channel in a predetermined subframe, and a downlink reference signal and a downlink feedback signal, if any, are transmitted in a predetermined subframe or in one or more subframes after the predetermined subframe. You may transmit on a channel or a downlink data channel.
  • the transmission / reception unit 103 uses the uplink reference signal and the uplink if present A feedback signal is received on an uplink control channel or an uplink data channel in a predetermined subframe, and a downlink reference signal and, if any, a downlink feedback signal are transmitted to a predetermined subframe or one or more subframes after the predetermined subframe. May be transmitted on the downlink control channel.
  • the downlink feedback signal (if any) is subjected to predetermined processing (for example, amplification, noise reduction, etc.) by the transmission / reception unit 103, the baseband signal processing unit 104, etc. with respect to the uplink reference signal received by the transmission / reception unit 103.
  • the uplink feedback signal (if any) is a signal transmitted by the user terminal 20 after performing predetermined processing (for example, amplification, noise reduction, etc.) on the received downlink reference signal. There may be. That is, the downlink feedback signal and / or the uplink feedback signal may be an analog signal.
  • the transmission / reception unit 103 provides the user terminal 20 with information regarding the configuration of the FB subframe, information for specifying the reference signal configuration, information regarding availability (presence / absence) of the FB subframe, and the subframe is the FB subframe. Information regarding whether or not, information regarding the timing of the FB subframe, and the like may be transmitted.
  • FIG. 13 is a diagram illustrating an example of a functional configuration of a radio base station according to an embodiment of the present invention.
  • the functional block of the characteristic part in this embodiment is mainly shown, and the wireless base station 10 shall also have another functional block required for radio
  • the baseband signal processing unit 104 includes at least a control unit (scheduler) 301, a transmission signal generation unit 302, a mapping unit 303, a reception signal processing unit 304, and a measurement unit 305. These configurations may be included in the radio base station 10, and a part or all of the configurations may not be included in the baseband signal processing unit 104.
  • the control unit (scheduler) 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, for example, signal generation by the transmission signal generation unit 302, signal allocation by the mapping unit 303, and the like.
  • the control unit 301 also controls signal reception processing by the reception signal processing unit 304, signal measurement by the measurement unit 305, and the like.
  • the control unit 301 controls scheduling (for example, resource allocation) of system information, a downlink data signal transmitted on the PDSCH, and a downlink control signal transmitted on the PDCCH and / or EPDCCH. Further, the control unit 301 controls generation of a downlink control signal (for example, delivery confirmation information), a downlink data signal, and the like based on a result of determining whether or not retransmission control is required for the uplink data signal. Further, the control unit 301 controls scheduling of synchronization signals (for example, PSS (Primary Synchronization Signal) / SSS (Secondary Synchronization Signal)), downlink reference signals (for example, CRS, CSI-RS, DMRS) and the like.
  • PSS Primary Synchronization Signal
  • SSS Secondary Synchronization Signal
  • control unit 301 includes an uplink data signal transmitted on the PUSCH, an uplink control signal transmitted on the PUCCH and / or PUSCH (for example, delivery confirmation information), a random access preamble transmitted on the PRACH, an uplink reference signal, etc. Control scheduling.
  • the control unit 301 controls transmission / reception so that at least one of the radio base station 10 and the user terminal 20 acquires propagation path information. Specifically, the control unit 301 performs control so that RS and analog feedback are transmitted and received using the subframe configuration as described in the first to third embodiments.
  • the control unit 301 receives an uplink reference signal and transmits a downlink reference signal within a predetermined period (for example, one subframe), while transmitting a downlink feedback signal based on the uplink reference signal and the downlink reference signal. It may be controlled to perform at least one of reception of the uplink feedback signal based on the above.
  • the control unit 301 may control the user terminal 20 to transmit a downlink reference signal (for example, CSI-RS) for downlink channel estimation. Further, the control unit 301 transmits a feedback reference signal sent back from the user terminal 20 after transmission of the downlink reference signal (the user terminal 20 performs transmission processing (for example, precoding, phase amplitude adjustment on the uplink reference signal received by the user terminal 20). Etc.) may be controlled so as to be received. Note that the control unit 301 may perform control so as to acquire downlink propagation path information based on the feedback reference signal.
  • CSI-RS downlink reference signal
  • the control unit 301 transmits a feedback reference signal sent back from the user terminal 20 after transmission of the downlink reference signal (the user terminal 20 performs transmission processing (for example, precoding, phase amplitude adjustment on the uplink reference signal received by the user terminal 20). Etc.) may be controlled so as to be received. Note that the control unit 301 may perform control so as to acquire downlink propagation path information based on the feedback reference signal.
  • control unit 301 may control the user terminal 20 to transmit an uplink reference signal for the radio base station 10. For example, the control unit 301 may perform control so as to notify the user terminal 20 of information related to uplink reference signal transmission (for example, an uplink reference signal transmission instruction).
  • uplink reference signal transmission for example, an uplink reference signal transmission instruction
  • the control unit 301 uses the digital BF (for example, precoding) by the baseband signal processing unit 104 and / or the analog BF (for example, phase rotation) by the transmission / reception unit 103 to form a transmission beam and / or a reception beam. To control.
  • the control unit 301 may perform control so as to form a beam based on downlink propagation path information, uplink propagation path information, and the like. Such propagation path information may be acquired from the reception signal processing unit 304 and / or the measurement unit 305.
  • the transmission signal generation unit 302 generates a downlink signal (downlink control signal, downlink data signal, downlink reference signal, etc.) based on an instruction from the control unit 301, and outputs it 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 transmission signal generation unit 302 generates, for example, a DL assignment that notifies downlink signal allocation information and a UL grant that notifies uplink signal allocation information based on an instruction from the control unit 301.
  • the downlink data signal is subjected to coding processing and modulation processing according to a coding rate, a modulation scheme, and the like determined based on channel state information (CSI: Channel State Information) from each user terminal 20.
  • CSI Channel State Information
  • the mapping unit 303 maps the downlink 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 it 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, an uplink signal (uplink control signal, uplink data signal, uplink reference signal, etc.) transmitted from the user terminal 20.
  • 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. For example, when receiving PUCCH including HARQ-ACK, HARQ-ACK is output to control section 301.
  • the reception signal processing unit 304 outputs the reception signal and / or 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, for example, receive power of a received signal (for example, RSRP (Reference Signal Received Power)), reception quality (for example, RSRQ (Reference Signal Received Quality), SINR (Signal to Interference plus Noise Ratio)), downlink You may measure about propagation path information (for example, CSI), uplink propagation path information, round-trip propagation path information, etc.
  • RSRP Reference Signal Received Power
  • reception quality for example, RSRQ (Reference Signal Received Quality)
  • SINR Signal to Interference plus Noise Ratio
  • the measurement result may be output to the control unit 301.
  • FIG. 14 is a diagram illustrating an example of the overall configuration of a user terminal according to an embodiment of the present invention.
  • 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 downlink 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 downlink user 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. Also, broadcast information of downlink data may be transferred to the application unit 205.
  • uplink user data is input from the application unit 205 to the baseband signal processing unit 204.
  • the baseband signal processing unit 204 performs transmission / reception units for retransmission control (for example, HARQ transmission processing), channel coding, precoding, discrete Fourier transform (DFT) processing, IFFT processing, and the like.
  • 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 may further include an analog beam forming unit that performs analog beam forming.
  • the analog beam forming unit includes an analog beam forming circuit (for example, phase shifter, phase shift circuit) or an analog beam forming apparatus (for example, phase shifter) described based on common recognition in the technical field according to the present invention. May be.
  • the transmission / reception antenna 201 may be constituted by an array antenna, for example.
  • the transmission / reception unit 203 transmits an uplink reference signal and receives a downlink reference signal within a predetermined period (for example, one subframe), while receiving a downlink feedback signal based on the uplink reference signal and the downlink reference signal. At least one of uplink feedback signal transmission based on
  • the transmission / reception unit 203 does not receive the downlink control channel in a predetermined period, and continuously performs transmission of the uplink reference signal, reception of the downlink reference signal, reception of the downlink feedback signal, or transmission of the uplink feedback signal (GI). You can go without).
  • the transmission / reception unit 203 may receive the downlink control channel and transmit the uplink reference signal before reception of the downlink control channel in a predetermined period.
  • the transmission / reception unit 203 uses an uplink reference signal and an uplink reference signal, if any, when using a subframe configuration (self-contained subframe for DL data) in which signals are transmitted / received in the order of a downlink control channel, a downlink data channel, and an uplink control channel.
  • the feedback signal is transmitted on the uplink control channel in a predetermined subframe, and the downlink reference signal and, if any, the downlink feedback signal are transmitted in the predetermined subframe or one or more subframes after the predetermined subframe. You may receive on a channel or a downlink data channel.
  • the transmission / reception unit 203 uses an uplink reference signal and an uplink reference signal, if any, when using a subframe configuration in which signals are transmitted and received in the order of downlink control channel, uplink data channel, and uplink control channel (UL data self-contained subframe).
  • the feedback signal is transmitted on the uplink control channel or the uplink data channel in a predetermined subframe, and the downlink reference signal and, if any, the downlink feedback signal are transmitted to the predetermined subframe or one or more subframes after the predetermined subframe. May be received on the downlink control channel.
  • the downlink feedback signal (if any) is a signal transmitted by the radio base station 10 by performing predetermined processing (for example, amplification, noise reduction, etc.) on the received uplink reference signal. (If any) is a signal transmitted by performing predetermined processing (for example, amplification, noise reduction, etc.) by the transmission / reception unit 203, the baseband signal processing unit 204, etc. on the downlink reference signal received by the transmission / reception unit 203 It is.
  • predetermined processing for example, amplification, noise reduction, etc.
  • the transceiver 203 receives information from the radio base station 10 regarding the configuration of the FB subframe, information for specifying the reference signal configuration, information regarding availability (presence / absence) of the FB subframe, and whether the subframe is an FB subframe. Information regarding whether or not, information regarding the timing of the FB subframe, and the like may be received.
  • FIG. 15 is a diagram illustrating an example of a functional configuration of a user terminal according to an embodiment of the present invention.
  • the functional blocks of the characteristic part in the present embodiment are mainly shown, and the user terminal 20 also has other functional blocks necessary for wireless communication.
  • the baseband signal processing unit 204 included in the user terminal 20 includes at least 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. Note that these configurations may be included in the user terminal 20, and some or all of the configurations may not be included in the baseband signal processing unit 204.
  • 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, signal allocation by the mapping unit 403, and the like.
  • the control unit 401 also controls signal reception processing by the reception signal processing unit 404, signal measurement by the measurement unit 405, and the like.
  • the control unit 401 obtains, from the received signal processing unit 404, a downlink control signal (a signal transmitted by PDCCH / EPDCCH) and a downlink data signal (a signal transmitted by PDSCH) transmitted from the radio base station 10.
  • the control unit 401 controls generation of an uplink control signal (eg, delivery confirmation information) and / or an uplink data signal based on a result of determining whether or not retransmission control is required for the downlink control signal and / or downlink data signal. To do.
  • the control unit 401 controls transmission and reception so that at least one of the radio base station 10 and the user terminal 20 acquires propagation path information. Specifically, the control unit 401 performs control such that RS and analog feedback are transmitted and received using the subframe configuration as described in the first to third embodiments.
  • the control unit 401 transmits an uplink reference signal and receives a downlink reference signal within a predetermined period (for example, 1, 2, or 3 subframes), while receiving a downlink feedback signal based on the uplink reference signal. In addition, it may be controlled to perform at least one of uplink feedback signal transmission based on the downlink reference signal.
  • a predetermined period for example, 1, 2, or 3 subframes
  • the control unit 401 may perform control such that an uplink reference signal (for example, SRS) for uplink channel estimation is transmitted to the radio base station 10.
  • the control unit 401 transmits a feedback reference signal sent back from the radio base station 10 after transmitting the uplink reference signal (a signal transmitted by the radio base station 10 by performing transmission processing on the uplink reference signal received by the radio base station 10). ) May be controlled to receive.
  • the control unit 401 may perform control so as to acquire uplink channel information based on the feedback reference signal.
  • the control unit 401 uses the digital BF (for example, precoding) by the baseband signal processing unit 204 and / or the analog BF (for example, phase rotation) by the transmission / reception unit 203 to form a transmission beam and / or a reception beam. You may control to.
  • the control unit 401 may perform control so as to form a beam based on downlink propagation path information, uplink propagation path information, and the like. Such propagation path information may be acquired from the reception signal processing unit 404 and / or the measurement unit 405.
  • control unit 401 may update parameters used for control based on the information.
  • the transmission signal generation unit 402 generates an uplink signal (uplink control signal, uplink data signal, uplink reference signal, etc.) based on an instruction from the control unit 401 and outputs the uplink 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 transmission signal generation unit 402 generates an uplink control signal related to delivery confirmation information, channel state information (CSI), and the like based on an instruction from the control unit 401, for example. In addition, the transmission signal generation unit 402 generates an uplink data signal based on an instruction from the control unit 401. For example, the transmission signal generation unit 402 is instructed by the control unit 401 to generate an uplink data signal when the UL grant is included in the downlink control signal notified from the radio base station 10.
  • CSI channel state information
  • the mapping unit 403 maps the uplink signal generated by the transmission signal generation unit 402 to a radio resource based on an instruction from the control unit 401, and outputs the radio signal 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 downlink signal (downlink control signal, downlink data signal, downlink 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 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, for example, broadcast information, system information, RRC signaling, DCI, and the like to the control unit 401.
  • the reception signal processing unit 404 outputs the reception signal and / or the signal after reception processing to the measurement unit 405.
  • the measurement unit 405 performs measurement on the received signal.
  • the measurement unit 405 performs measurement using the downlink reference signal transmitted from the radio base station 10.
  • 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.
  • the measurement unit 405 includes, for example, received power (for example, RSRP) of received signals, reception quality (for example, RSRQ, received SINR), downlink channel information (for example, CSI), uplink channel information, round-trip channel information, and the like. May be measured.
  • the measurement result may be output to the control unit 401.
  • 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. 16 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. It is realized by controlling the reading and / or writing of data 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)
  • TTI transmission time interval
  • a plurality of consecutive subframes may be referred to as a TTI
  • one slot may be referred to as a TTI.
  • the subframe and / or TTI may be a subframe (1 ms) in the existing LTE, a period shorter than 1 ms (eg, 1-13 symbols), or a period longer than 1 ms. There may be.
  • TTI means, for example, a minimum time unit for scheduling in wireless communication.
  • a radio base station performs scheduling for assigning 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 them.
  • 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.
  • connection 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.
  • connection may be read as “access”.
  • 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 It can be considered to be “connected” or “coupled” to each other, such as by using electromagnetic energy having wavelengths in the region, microwave region, and / or light (both visible and invisible) region.

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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 vise à acquérir des informations de trajet de propagation en moins de temps qu'un système LTE existant. Un terminal d'utilisateur selon un mode de réalisation de la présente invention communique sans fil avec une station de base. Le terminal d'utilisateur est caractérisé en ce que : il comprend une unité de transmission/réception qui transmet et reçoit des signaux, et une unité de contrôle qui contrôle la transmission et la réception de sorte que la station de base et/ou le terminal d'utilisateur acquièrent des informations de trajet de propagation ; et l'unité de transmission/réception transmet un signal de référence de liaison montante et reçoit un signal de référence de liaison descendante dans une période prescrite, et reçoit un signal de rétroaction de liaison descendante sur la base du signal de référence de liaison montante et/ou transmet un signal de rétroaction de liaison montante sur la base du signal de référence de liaison descendante.
PCT/JP2017/031151 2016-08-31 2017-08-30 Terminal d'utilisateur, et procédé de communication sans fil Ceased WO2018043560A1 (fr)

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