WO2022186230A1 - Équipement terminal et dispositif de station de base - Google Patents

Équipement terminal et dispositif de station de base Download PDF

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Publication number
WO2022186230A1
WO2022186230A1 PCT/JP2022/008703 JP2022008703W WO2022186230A1 WO 2022186230 A1 WO2022186230 A1 WO 2022186230A1 JP 2022008703 W JP2022008703 W JP 2022008703W WO 2022186230 A1 WO2022186230 A1 WO 2022186230A1
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WIPO (PCT)
Prior art keywords
transmission
dmrs
unit
parameters
base station
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PCT/JP2022/008703
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English (en)
Japanese (ja)
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理 中村
秀夫 難波
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シャープ株式会社
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Priority to JP2023503879A priority Critical patent/JPWO2022186230A1/ja
Publication of WO2022186230A1 publication Critical patent/WO2022186230A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling

Definitions

  • the present invention relates to terminal devices and base station devices. This application claims priority based on Japanese Patent Application No. 2021-34379 filed in Japan on March 4, 2021, the contents of which are incorporated herein.
  • DMRS Demodulation Reference Signal
  • NR Release 15 specifies inter-slot repetition transmission in order to improve communication reliability and expand coverage. Inter-slot repetition allows the same data to be repeatedly transmitted in multiple slots. However, since multiple slots are required for repeated transmission, there is a problem in terms of delay. Therefore, in NR Release 16, intra-slot repeat transmission is specified. In intra-slot repetition transmission, it is possible to set a repetition unit multiple times in a slot and perform transmission.
  • Non-Patent Document 1 In the specifications up to Rel-16, the DMRS that can be used for channel estimation is limited to within a repetition unit or within a slot. Accuracy can be greatly improved. Therefore, in NR Release 17, joint channel estimation (DMRS bundling, also called DMRS sharing) is being considered, which makes it possible to use DMRSs included in different repetition units or different slots.
  • DMRS bundling also called DMRS sharing
  • Non-Patent Document 2 proposes that when joint channel estimation is applied, DMRSs are rearranged so that they are evenly spaced in a plurality of allocated slots or a plurality of repeated time resources.
  • Non-Patent Document 3 proposes switching between repeated transmission and single TB transmission by dynamic signaling. As a result, repeated transmission can be applied to secure a low delay, and batch encoding transmission of 1 TB can be performed to improve transmission characteristics, making it possible to perform control according to QoS.
  • Non-Patent Document 2 when performing joint channel estimation, by rearranging DMRSs (arranging DMRSs at equal intervals in time resources), the rearranged terminal device can obtain good transmission characteristics.
  • the DMRS allocation pattern changes from that of users who are not rearranged, it becomes difficult to apply multi-user MIMO (Multiple Input Multiple Output).
  • One aspect of the present invention has been made in view of such circumstances, and its purpose is to efficiently expand coverage by enabling effective application of joint channel estimation.
  • the configurations of the base station apparatus, the terminal apparatus, and the communication method according to one aspect of the present invention to solve the above-described problems are as follows.
  • One aspect of the present invention is a terminal device that transmits to a base station device, the upper layer receiving higher layer signaling including two parameters of a repetition unit and a repetition number from the base station device.
  • the processing unit uses the processing unit, the higher layer signaling, and a predetermined field included in downlink control information, a first transmission that performs repeated transmission using the two parameters, and the radio allocated by the two parameters
  • the multiplexing unit arranges at least one reference signal for each repetition during DMRS arrangement related to the first transmission, and At the time of DMRS allocation, at least one reference signal is allocated to the radio resources allocated by the two parameters.
  • the multiplexing unit when performing DMRS allocation related to the second transmission, divides the radio resources allocated by the two parameters into 14 symbols, and A DMRS is arranged at a predetermined position of the symbol.
  • One aspect of the present invention is a base station apparatus that receives a signal transmitted by a terminal apparatus, and an upper layer that generates higher layer signaling including two parameters of a repetition unit and a repetition number for the terminal apparatus.
  • the downlink control signal unit arranges at least one reference signal for each repetition when arranging DMRS related to the first transmission, and performs the second transmission. during DMRS configuration associated with , it is indicated to configure at least one reference signal on the radio resources allocated according to the two parameters.
  • the downlink control signal unit divides the radio resources allocated by the two parameters into every 14 symbols when performing the DMRS arrangement related to the second transmission, A DMRS is arranged at a predetermined position of the divided symbols.
  • FIG. 4 is a diagram showing an example of smart DMRS deployment according to the first embodiment
  • FIG. 4 is a diagram showing an example of DMRS allocation in repeated transmission and one transport block transmission according to the first embodiment
  • FIG. 4 is a diagram showing an example of the relationship between the number of symbols and DMRS positions according to the first embodiment
  • FIG. 10 is a diagram showing another example of DMRS allocation in repeated transmission and one transport block transmission according to the first embodiment
  • FIG. 10 is a diagram showing a conventional example of use of radio resources in repeated transmission according to the second embodiment;
  • FIG. 10 is a diagram showing an example of use of radio resources in repeated transmission (DMRS transmission) according to the second embodiment;
  • FIG. 10 is a diagram showing an example of use of radio resources (data transmission) in repeated transmission according to the second embodiment;
  • FIG. 10 is a diagram showing a table used for determining transport block sizes of 3824 or less;
  • the communication system includes base station devices (cells, small cells, serving cells, component carriers, eNodeB, Home eNodeB, gNodeB) and terminal devices (terminals, mobile terminals, UE: User Equipment).
  • base station devices cells, small cells, serving cells, component carriers, eNodeB, Home eNodeB, gNodeB
  • terminal devices terminal devices, mobile terminals, UE: User Equipment.
  • the base station device in the case of the downlink, the base station device becomes a transmitting device (transmitting point, transmitting antenna group, transmitting antenna port group, TRP (Tx/Rx Point)), and the terminal device becomes a receiving device (receiving point, receiving terminal , receiving antenna group, receiving antenna port group).
  • TRP Tx/Rx Point
  • the base station apparatus becomes a receiving apparatus
  • the terminal apparatus becomes a transmitting apparatus.
  • the communication system is also applicable to D2D (Device-to-Device, sidelink) communication. In that case, both
  • the communication system is not limited to data communication between a terminal device and a base station device with human intervention.
  • human intervention such as MTC (Machine Type Communication), M2M communication (Machine-to-Machine Communication), IoT (Internet of Things) communication, NB-IoT (Narrow Band-IoT), etc.
  • MTC Machine Type Communication
  • M2M communication Machine-to-Machine Communication
  • IoT Internet of Things
  • NB-IoT Narrow Band-IoT
  • the communication system can use a multicarrier transmission scheme such as CP-OFDM (Cyclic Prefix-Orthogonal Frequency Division Multiplexing) in uplink and downlink.
  • CP-OFDM Cyclic Prefix-Orthogonal Frequency Division Multiplexing
  • the communication system applies Transform precoding, that is, DFTS-OFDM (Discrete Fourier Transform Spread-Orthogonal Frequency Division Multiplexing, also called SC-FDMA) that applies DFT when upper layer parameters for Transform precoder are set. is used).
  • Transform precoding that is, DFTS-OFDM (Discrete Fourier Transform Spread-Orthogonal Frequency Division Multiplexing, also called SC-FDMA) that applies DFT when upper layer parameters for Transform precoder are set. is used).
  • SC-FDMA Discrete Fourier Transform Spread-Orthogonal Frequency Division Multiplexing
  • the base station device and the terminal device in this embodiment are frequency bands called so-called licensed bands, which are licensed from countries and regions where wireless operators provide services, and / or It is possible to communicate in a frequency band called an unlicensed band, which does not require a permit (license) from a country or region.
  • X/Y includes the meaning of "X or Y”. In this embodiment, “X/Y” includes the meaning of “X and Y.” In this embodiment, “X/Y” includes the meaning of "X and/or Y”.
  • FIG. 1 is a diagram showing a configuration example of a communication system 1 according to this embodiment.
  • a communication system 1 in this embodiment includes a base station apparatus 10 and a terminal apparatus 20 .
  • the coverage 10a is a range (communication area) in which the base station apparatus 10 can connect (communicate) with the terminal apparatus 20 (also called a cell).
  • the base station apparatus 10 can accommodate a plurality of terminal apparatuses 20 in the coverage 10a.
  • the uplink radio communication r30 includes at least the following uplink physical channels.
  • Uplink physical channels are used to transmit information output from higher layers.
  • - Physical uplink control channel (PUCCH) Physical uplink shared channel (PUSCH) - Physical Random Access Channel (PRACH)
  • PUCCH is a physical channel used to transmit uplink control information (UCI).
  • the uplink control information includes positive acknowledgment (ACK)/negative acknowledgment (NACK) for downlink data.
  • Downlink data here refers to Downlink transport block, Medium Access Control Protocol Data Unit: MAC PDU, Downlink-Shared Channel: DL-SCH, Physical Downlink Shared Channel: PDSCH, and the like.
  • ACK/NACK is also called HARQ-ACK (Hybrid Automatic Repeat request ACKnowledgement), HARQ feedback, HARQ response, HARQ control information, or a signal indicating acknowledgment.
  • HARQ-ACK Hybrid Automatic Repeat request ACKnowledgement
  • NR supports at least five formats: PUCCH format 0, PUCCH format 1, PUCCH format 2, PUCCH format 3, and PUCCH format 4.
  • PUCCH format 0 and PUCCH format 2 are composed of 1 or 2 OFDM symbols, and other PUCCHs are composed of 4 to 14 OFDM symbols. It is also composed of PUCCH format 0 and PUCCH format 1 bandwidth 12 subcarriers.
  • PUCCH format 0 1-bit (or 2-bit) ACK/NACK is transmitted using resource elements of 12 subcarriers and 1 OFDM symbol (or 2 OFDM symbols).
  • the uplink control information includes a scheduling request (SR) used to request PUSCH (Uplink-Shared Channel: UL-SCH) resources for initial transmission.
  • SR scheduling request
  • PUSCH Uplink-Shared Channel: UL-SCH
  • a scheduling request indicates a request for UL-SCH resources for initial transmission.
  • the uplink control information includes downlink channel state information (Channel State Information: CSI).
  • the downlink channel state information includes a rank indicator (RI) indicating a preferred spatial multiplexing number (number of layers), a precoding matrix indicator (PMI) indicating a preferred precoder, and a preferred transmission rate. including Channel Quality Indicator (CQI), etc.
  • the PMI indicates a codebook determined by the terminal.
  • the codebook relates to precoding of physical downlink shared channels.
  • a higher layer parameter RI limit can be set.
  • the RI limit has multiple setting parameters, one of which is the type 1 single panel RI limit, which consists of 8 bits.
  • Bitmap parameters, type 1 single-panel RI restrictions form bit sequences r 7 , . . . r 2 , r 1 .
  • r 7 is the MSB (Most Significant Bit)
  • r 0 is the LSB (Least Significant Bit).
  • PMI and RI reporting corresponding to the precoder associated with layer i+1 is not allowed.
  • RI restrictions include type 1 single panel RI restrictions and type 1 multi-panel RI restrictions, which consist of 4 bits.
  • the type 1 multi-panel RI restriction bitmap parameters form the bit sequence r 4 , r 3 , r 2 , r 1 .
  • r 4 is the MSB and r 0 is the LSB.
  • r i is zero (where i is 0, 1, 2, 3), PMI and RI reporting corresponding to the precoder associated with layer i+1 is not allowed.
  • the CQI can use a suitable modulation scheme (eg, QPSK, 16QAM, 64QAM, 256QAMAM, etc.) in a predetermined band, a coding rate, and an index (CQI index) indicating frequency utilization efficiency.
  • BLER block error probability
  • PUSCH is a physical channel used to transmit uplink data (Uplink Transport Block, Uplink-Shared Channel: UL-SCH), and as a transmission method, CP-OFDM or DFT-S-OFDM is applied.
  • PUSCH may be used to transmit control information such as HARQ-ACK and/or channel state information for downlink data along with the uplink data.
  • PUSCH may be used to transmit channel state information only.
  • PUSCH may be used to transmit HARQ-ACK and channel state information only.
  • RRC signaling is also referred to as RRC message/RRC layer information/RRC layer signaling/RRC layer parameters/RRC information element.
  • RRC signaling is information/signals processed in the radio resource control layer.
  • the RRC signaling transmitted from the base station apparatus may be signaling common to multiple terminal apparatuses within a cell.
  • the RRC signaling transmitted from the base station apparatus may be dedicated signaling (also referred to as dedicated signaling) for a certain terminal apparatus. That is, user equipment specific information is sent to a terminal using dedicated signaling.
  • the RRC message can include UE Capabilities of the terminal device.
  • UE Capability is information indicating the functions supported by the terminal device.
  • PUSCH is used to transmit MAC CE (Medium Access Control Element).
  • MAC CE is information/signals processed (transmitted) in the Medium Access Control layer.
  • power headroom may be included in MAC CE and reported via PUSCH. That is, the MAC CE field is used to indicate the level of power headroom.
  • RRC signaling and/or MAC CE are also referred to as higher layer signaling.
  • RRC signaling and/or MAC CE are included in the transport block.
  • the PRACH is used to transmit preambles used for random access.
  • PRACH is used to transmit a random access preamble.
  • PRACH is used to indicate initial connection establishment procedures, handover procedures, connection re-establishment procedures, synchronization (timing adjustment) for uplink transmissions, and PUSCH (UL-SCH) resource requirements. used for
  • an uplink reference signal (Uplink Reference Signal: UL RS) is used as an uplink physical signal.
  • the uplink reference signal includes a demodulation reference signal (DMRS), a sounding reference signal (SRS), a phase tracking signal (PTRS), and the like.
  • DMRS relates to transmission of physical uplink shared channel/physical uplink control channel. For example, when the base station apparatus 10 demodulates the physical uplink shared channel/physical uplink control channel, the demodulation reference signal is used to perform channel estimation/channel correction.
  • the SRS is not related to the transmission of the physical uplink shared channel/physical uplink control channel.
  • the base station apparatus 10 uses SRS to measure uplink channel conditions (CSI measurement).
  • the PTRS is related to transmission of the physical uplink shared channel/physical uplink control channel.
  • the base station apparatus 10 uses PTRS for phase tracking.
  • downlink physical channels are used in downlink r31 radio communication.
  • Downlink physical channels are used to transmit information output from higher layers.
  • PBCH Physical broadcast channel
  • PDCH Physical downlink control channel
  • PDSCH Physical downlink shared channel
  • the PBCH is used to broadcast a master information block (Master Information Block: MIB, Broadcast Channel: BCH) commonly used by terminal devices.
  • MIB is one of the system information.
  • the MIB contains the downlink transmission bandwidth setting, System Frame number (SFN).
  • SFN System Frame number
  • the MIB may contain information indicating at least part of the slot number, subframe number, and radio frame number in which the PBCH is transmitted.
  • the PDCCH is used to transmit downlink control information (DCI).
  • DCI downlink control information
  • a plurality of formats (also called DCI formats) are defined based on usage.
  • a DCI format may be defined based on the type and number of bits of DCI that constitute one DCI format. Each format is used according to its purpose.
  • Downlink control information includes control information for downlink data transmission and control information for uplink data transmission.
  • a DCI format for downlink data transmission is also called a downlink assignment (or downlink grant).
  • a DCI format for uplink data transmission is also called an uplink grant (or uplink assignment).
  • a downlink grant may at least be used for scheduling the PDSCH in the same slot in which the downlink grant was transmitted.
  • Downlink assignment includes frequency domain resource allocation for PDSCH, time domain resource allocation, MCS (Modulation and Coding Scheme) for PDSCH, NDI (New Data Indicator) for indicating initial transmission or retransmission, HARQ in downlink Downlink control information such as information indicating the process number and Redundancy version indicating the amount of redundancy added to the codeword during error correction coding is included.
  • a codeword is data after error correction coding.
  • the downlink assignment may include a Transmission Power Control (TPC) command for PUCCH and a TPC command for PUSCH.
  • the uplink grant may include an aggregation level (transmission repetition count) that indicates the number of times PUSCH is repeatedly transmitted. Note that the DCI format for each downlink data transmission includes information (fields) necessary for its use among the above information.
  • the uplink grant includes information on resource block allocation for transmitting PUSCH (resource block allocation and hopping resource allocation), time domain resource allocation, information on MCS of PUSCH (MCS/redundancy version), information on DMRS port, information on PUSCH It includes uplink control information such as information on retransmission, TPC commands for PUSCH, and downlink channel state information (CSI) requests (CSI requests).
  • the uplink grant may include information indicating an uplink HARQ process number, information indicating a redundancy version, a transmission power control (TPC) command for PUCCH, and a TPC command for PUSCH.
  • TPC transmission power control
  • the DCI format for each uplink data transmission includes information (fields) necessary for its use among the above information.
  • the OFDM symbol number (position) for transmitting the DMRS symbol is between the first OFDM symbol of the slot and the last OFDM symbol of the PUSCH resource scheduled in the slot when intra frequency hopping is not applied and PUSCH mapping type A is used. given by the signaled duration of For PUSCH mapping type B, where intra frequency hopping is not applied, the OFDM symbol number (position) where a DMRS symbol is transmitted is given by the scheduled PUSCH resource period. If intra frequency hopping is applied, it is given in terms of duration per hop. For PUSCH mapping type A, only if the higher layer parameter indicating the position of the leading DMRS is 2, and the higher layer parameter indicating the number of additional DMRSs is 3 is supported. Also, for PUSCH mapping type A, the 4-symbol period is applicable only when the higher layer parameter indicating the position of the leading DMRS is 2.
  • a PDCCH is generated by adding a Cyclic Redundancy Check (CRC) to downlink control information.
  • CRC Cyclic Redundancy Check
  • the CRC parity bits are scrambled (exclusive OR operation, also called mask) using a predetermined identifier.
  • Parity bits are C-RNTI (Cell-Radio Network Temporary Identifier), CS (Configured Scheduling)-RNTI, Temporary C-RNTI, P (Paging)-RNTI, SI (System Information)-RNTI, or RA (Random Access) - RNTI, SP-CSI (Semi-Persistent Channel State-Information) - RNTI, scrambled with MCS-C-RNTI.
  • C-RNTI Cell-Radio Network Temporary Identifier
  • CS Configured Scheduling
  • Temporary C-RNTI Temporary C-RNTI
  • P Paging
  • SI System Information
  • RA Random Access
  • C-RNTI and CS-RNTI are identifiers for identifying terminal devices within a cell.
  • Temporary C-RNTI is an identifier for identifying a terminal device that has transmitted a random access preamble during a contention based random access procedure.
  • C-RNTI and Temporary C-RNTI are used to control PDSCH transmission or PUSCH transmission in a single subframe.
  • the CS-RNTI is used to periodically allocate PDSCH or PUSCH resources.
  • the CS-RNTI scrambled PDCCH (DCI format) is used to activate or deactivate CS type 2.
  • the control information (MCS, radio resource allocation, etc.) included in the PDCCH scrambled by CS-RNTI is included in the upper layer parameters related to CS, and activation (setting) of CS is performed by the upper layer parameters.
  • P-RNTI is used to transmit paging messages (Paging Channel: PCH).
  • SI-RNTI is used to transmit SIBs.
  • RA-RNTI is used to send a random access response (message 2 in the random access procedure).
  • SP-CSI-RNTI is used for semi-static CSI reporting.
  • MCS-C-RNTI is used in selecting a low spectral efficiency MCS table.
  • the PDSCH is used to transmit downlink data (downlink transport block, DL-SCH).
  • the PDSCH is used to transmit system information messages (also called System Information Block: SIB). Part or all of the SIB may be included in the RRC message.
  • SIB System Information Block
  • the PDSCH is used to transmit RRC signaling.
  • the RRC signaling transmitted from the base station apparatus may be common (cell-specific) for multiple terminal apparatuses within the cell. That is, user equipment common information within that cell is transmitted using cell-specific RRC signaling.
  • the RRC signaling transmitted from the base station apparatus may be a message dedicated to a certain terminal apparatus (also referred to as dedicated signaling). That is, user equipment specific information is sent to a terminal using dedicated messages.
  • the PDSCH is used to transmit MAC CE.
  • RRC signaling and/or MAC CE are also referred to as higher layer signaling.
  • PMCH is used to transmit multicast data (Multicast Channel: MCH).
  • a synchronization signal (SS) and a downlink reference signal (DL RS) are used as downlink physical signals.
  • Downlink physical signals are not used to transmit information output from higher layers, but are used by the physical layer.
  • the synchronization signal is used by the terminal device to synchronize the frequency domain and time domain of the downlink.
  • a downlink reference signal is used by a terminal device to perform channel estimation/channel correction of a downlink physical channel.
  • downlink reference signals are used to demodulate PBCH, PDSCH, and PDCCH.
  • the downlink reference signal can also be used by the terminal device to measure the downlink channel state (CSI measurement).
  • a downlink physical channel and a downlink physical signal are also collectively referred to as a downlink signal.
  • an uplink physical channel and an uplink physical signal are collectively referred to as an uplink signal.
  • Downlink physical channels and uplink physical channels are also collectively referred to as physical channels.
  • Downlink physical signals and uplink physical signals are also collectively referred to as physical signals.
  • BCH, UL-SCH and DL-SCH are transport channels.
  • Channels used in the MAC layer are called transport channels.
  • a transport channel unit used in the MAC layer is also called a transport block (TB) or a MAC PDU (Protocol Data Unit).
  • TB transport block
  • MAC PDU Protocol Data Unit
  • a transport block is a unit of data that the MAC layer delivers to the physical layer. At the physical layer, transport blocks are mapped to codewords, and encoding processing and the like are performed for each codeword.
  • FIG. 2 is a schematic block diagram of the configuration of the base station apparatus 10 according to this embodiment.
  • the base station apparatus 10 includes an upper layer processing unit (upper layer processing step) 102, a control unit (control step) 104, a transmitting unit (transmitting step) 106, a transmitting antenna 108, a receiving antenna 110, and a receiving unit (receiving step) 112.
  • composed of Transmission section 106 generates a physical downlink channel according to the logical channel input from upper layer processing section 102 .
  • the transmitting unit 106 includes an encoding unit (encoding step) 1060, a modulation unit (modulation step) 1062, a downlink control signal generation unit (downlink control signal generation step) 1064, a downlink reference signal generation unit (downlink reference signal generation step) 1066 , multiplexing section (multiplexing step) 1068 , and radio transmission section (radio transmission step) 1070 .
  • the receiving unit 112 detects (demodulates, decodes, etc.) a physical uplink channel and inputs the content to the upper layer processing unit 102 .
  • the receiving unit 112 includes a radio receiving unit (radio receiving step) 1120, a channel estimating unit (channel estimating step) 1122, a demultiplexing unit (demultiplexing step) 1124, an equalizing unit (equalizing step) 1126, a demodulating unit ( demodulation step) 1128 and a decoding unit (decoding step) 1130 .
  • radio receiving step radio receiving step
  • channel estimating unit channel estimating step
  • demultiplexing step demultiplexing step
  • equalizing unit equalizing unit
  • demodulating unit demodulation step
  • decoding step decoding step
  • the upper layer processing unit 102 includes a medium access control (MAC) layer, a packet data convergence protocol (PDCP) layer, a radio link control (RLC) layer, a radio resource control (Radio Resource Control: Performs processing of higher layers than the physical layer such as the RRC) layer.
  • Upper layer processing section 102 generates information necessary for controlling transmitting section 106 and receiving section 112 and outputs the information to control section 104 .
  • Upper layer processing section 102 outputs downlink data (DL-SCH, etc.), system information (MIB, SIB), etc. to transmitting section 106 .
  • the DMRS configuration information may be notified to the terminal device by system information (MIB or SIB) instead of notification by an upper layer such as RRC.
  • the upper layer processing unit 102 generates system information (MIB or a part of SIB) to be broadcast or acquires it from a higher node.
  • Upper layer processing section 102 outputs the system information to be broadcast to transmitting section 106 as BCH/DL-SCH.
  • the MIB is placed on the PBCH in transmitting section 106 .
  • the SIB is mapped to the PDSCH in transmitting section 106 .
  • the upper layer processing unit 102 generates system information (SIB) unique to the terminal device, or acquires it from a higher level.
  • SIB is mapped to the PDSCH in transmitting section 106 .
  • the upper layer processing unit 102 sets various RNTIs for each terminal device.
  • the RNTI is used for encryption (scrambling) of PDCCH, PDSCH, and the like.
  • Upper layer processing section 102 outputs the RNTI to control section 104 /transmitting section 106 /receiving section 112 .
  • the upper layer processing unit 102 uses the downlink data (transport block, DL-SCH) allocated to the PDSCH, system information specific to the terminal device (System Information Block: SIB), RRC message, MAC CE, DMRS configuration information as SIB , and MIB, or DMRS configuration information if not notified by DCI, is generated or acquired from a higher node, and output to transmission section 106 .
  • the upper layer processing unit 102 manages various setting information of the terminal device 20 . Note that part of the radio resource control function may be performed in the MAC layer or the physical layer.
  • the upper layer processing unit 102 receives information about the terminal device, such as the functions supported by the terminal device (UE capabilities), from the terminal device 20 (via the receiving unit 112).
  • the terminal device 20 transmits its own function to the base station device 10 using a higher layer signal (RRC signaling).
  • Information about the terminal device includes information indicating whether the terminal device supports a given function or information indicating that the terminal device has completed installation and testing for the given function. Whether or not a given function is supported includes whether installation and testing for the given function have been completed.
  • the terminal device transmits information (parameters) indicating whether or not the predetermined function is supported. If a terminal device does not support a given function, the terminal device may not transmit information (parameters) indicating whether it supports the given function. That is, whether or not the predetermined function is supported is notified by transmitting information (parameters) indicating whether or not the predetermined function is supported. Information (parameter) indicating whether or not a predetermined function is supported may be notified using one bit of 1 or 0.
  • Upper layer processing section 102 acquires DL-SCH from the decoded uplink data (including CRC) from receiving section 112 .
  • the upper layer processing unit 102 performs error detection on the uplink data transmitted by the terminal device. For example, the error detection is done at the MAC layer.
  • the control unit 104 controls the transmission unit 106 and the reception unit 112 based on various setting information input from the upper layer processing unit 102/reception unit 112 .
  • Control section 104 generates downlink control information (DCI) based on the setting information input from upper layer processing section 102 /receiving section 112 and outputs it to transmitting section 106 .
  • DCI downlink control information
  • the control unit 104 considers the DMRS setting information (whether it is the DMRS configuration 1 or the DMRS configuration 2) input from the upper layer processing unit 102/receiving unit 112, DMRS frequency allocation (DMRS configuration 1 In the case of , an even numbered subcarrier or an odd numbered subcarrier, and in the case of DMRS configuration 2, one of the 0th to 2nd sets) is set, and DCI is generated.
  • DMRS setting information whether it is the DMRS configuration 1 or the DMRS configuration 2
  • DMRS frequency allocation DMRS configuration 1 In the case of , an even numbered subcarrier or an odd numbered subcarrier, and in the case of DMRS configuration 2, one of the 0th to 2nd sets
  • the control unit 104 determines the MCS of PUSCH in consideration of the channel quality information (CSI measurement results) measured by the propagation path estimation unit 1122.
  • the control unit 104 determines an MCS index corresponding to the MCS of the PUSCH.
  • Control section 104 includes the determined MCS index in the uplink grant.
  • the transmission section 106 generates PBCH, PDCCH, PDSCH, downlink reference signals, etc. according to the signal input from the upper layer processing section 102/control section 104 .
  • Encoding section 1060 converts BCH, DL-SCH, etc. input from upper layer processing section 102 into block code, convolutional code, turbo using a predetermined/determined encoding method by upper layer processing section 102. Encoding (including repetition) is performed using code, polar encoding, LDPC code, or the like. Coding section 1060 punctures the coded bits based on the coding rate input from control section 104 .
  • Modulation section 1062 data-modulates the coded bits input from encoding section 1060 using a predetermined modulation scheme (modulation order) input from control section 104 such as BPSK, QPSK, 16QAM, 64QAM, 256QAM. .
  • modulation order is based on the MCS index selected by controller 104 .
  • the downlink control signal generation section 1064 adds CRC to the DCI input from the control section 104 .
  • the downlink control signal generator 1064 performs encryption (scrambling) on the CRC using the RNTI. Furthermore, the downlink control signal generating section 1064 performs QPSK modulation on the DCI to which the CRC is added to generate PDCCH.
  • the downlink reference signal generating section 1066 generates a sequence known by the terminal device as a downlink reference signal. The known sequence is obtained according to a predetermined rule based on a physical cell identifier for identifying base station apparatus 10 or the like.
  • a multiplexing section 1068 multiplexes the modulation symbols of each channel input from the PDCCH/downlink reference signal/modulation section 1062 . That is, multiplexing section 1068 maps PDCCH/downlink reference signals and modulation symbols of each channel to resource elements. Resource elements to be mapped are controlled by downlink scheduling input from the control section 104 .
  • a resource element is the minimum unit of physical resource consisting of one OFDM symbol and one subcarrier.
  • a plurality of resource elements form a resource block (RB), and scheduling is applied using the RB as the minimum unit.
  • transmitting section 106 includes coding section 1060 and modulating section 1062 in the number of layers. In this case, upper layer processing section 102 sets MCS for each transport block of each layer.
  • the radio transmission unit 1070 performs Inverse Fast Fourier Transform (IFFT) on the multiplexed modulation symbols and the like to generate OFDM symbols.
  • a radio transmitter 1070 adds a cyclic prefix (CP) to the OFDM symbol to generate a baseband digital signal.
  • radio transmission section 1070 converts the digital signal into an analog signal, removes unnecessary frequency components by filtering, up-converts to a carrier frequency, amplifies the power, and outputs the signal to transmission antenna 108 for transmission.
  • Receiving section 112 detects (separates, demodulates, and decodes) a signal received from terminal device 20 via receiving antenna 110 according to an instruction from control section 104, and sends the decoded data to upper layer processing section 102/control section 104. input.
  • the radio receiving unit 1120 down-converts the uplink signal received via the receiving antenna 110 into a baseband signal, removes unnecessary frequency components, and amplifies the signal so that the signal level is appropriately maintained. It controls the level, performs quadrature demodulation based on the in-phase and quadrature components of the received signal, and converts the quadrature-demodulated analog signal to a digital signal.
  • Radio receiving section 1120 removes the portion corresponding to CP from the converted digital signal.
  • Radio receiving section 1120 performs Fast Fourier Transform (FFT) on the CP-removed signal to extract a signal in the frequency domain.
  • the frequency domain signal is output to demultiplexing section 1124 .
  • FFT Fast Fourier Transform
  • the demultiplexing unit 1124 Based on the uplink scheduling information (uplink data channel allocation information, etc.) input from the control unit 104, the demultiplexing unit 1124 converts the signal input from the radio receiving unit 1120 into PUSCH, PUCCH, and uplink reference signals. and other signals.
  • the separated uplink reference signals are input to the channel estimation section 1122 .
  • the separated PUSCH and PUCCH are output to equalization section 1126 .
  • the propagation path estimation unit 1122 estimates the frequency response (or delay profile) using the uplink reference signal.
  • a frequency response result obtained by channel estimation for demodulation is input to equalization section 1126 .
  • the propagation path estimation unit 1122 uses the uplink reference signal to measure uplink channel conditions (measurement of RSRP (Reference Signal Received Power), RSRQ (Reference Signal Received Quality), RSSI (Received Signal Strength Indicator)). conduct. Measurement of uplink channel conditions is used for determination of MCS for PUSCH and the like.
  • the equalization section 1126 performs processing for compensating the influence of the propagation path from the frequency response input from the propagation path estimation section 1122 .
  • any existing channel compensation such as a method of multiplying MMSE weights or MRC weights, a method of applying MLD, or the like can be applied.
  • the demodulation section 1128 performs demodulation processing based on the information of the modulation scheme determined in advance/instructed by the control section 104 .
  • the decoding unit 1130 performs decoding processing on the output signal of the demodulation unit based on the coding rate information instructed by the predetermined coding rate/control unit 104 .
  • Decoding section 1130 inputs the decoded data (such as UL-SCH) to upper layer processing section 102 .
  • FIG. 3 is a schematic block diagram showing the configuration of the terminal device 20 in this embodiment.
  • the terminal device 20 includes an upper layer processing unit (upper layer processing step) 202, a control unit (control step) 204, a transmitting unit (transmitting step) 206, a transmitting antenna 208, a receiving antenna 210, and a receiving unit (receiving step) 212. consists of
  • the upper layer processing unit 202 processes the medium access control (MAC) layer, the packet data integration protocol (PDCP) layer, the radio link control (RLC) layer, and the radio resource control (RRC) layer.
  • the upper layer processing unit 202 manages various setting information of its own terminal device.
  • the upper layer processing section 202 notifies the base station apparatus 10 of information (UE Capability) indicating the functions of the terminal device supported by the own terminal apparatus via the transmitting section 206 .
  • the upper layer processing unit 202 notifies the UE Capability by RRC signaling.
  • the upper layer processing unit 202 acquires the decoded data such as DL-SCH and BCH from the receiving unit 212 .
  • the upper layer processing unit 202 generates HARQ-ACK from the DL-SCH error detection result.
  • the upper layer processing unit 202 generates SR.
  • the upper layer processing unit 202 generates UCI including HARQ-ACK/SR/CSI (including CQI report).
  • upper layer processing section 202 inputs information on the DMRS configuration to control section 204 .
  • the upper layer processing section 202 inputs the UCI and UL-SCH to the transmitting section 206 . Note that part of the functions of the upper layer processing unit 202 may be included in the control unit 204 .
  • the control unit 204 interprets the downlink control information (DCI) received via the receiving unit 212.
  • the control unit 204 controls the transmission unit 206 according to the PUSCH scheduling/MCS index/TPC (Transmission Power Control) obtained from the DCI for uplink transmission.
  • the control unit 204 controls the receiving unit 212 according to the PDSCH scheduling/MCS index obtained from the DCI for downlink transmission. Further, the control unit 204 identifies the DMRS frequency allocation according to the information about the DMRS frequency allocation (port number) included in the DCI for downlink transmission and the DMRS configuration information input from the upper layer processing unit 202. .
  • the transmitting unit 206 includes an encoding unit (encoding step) 2060, a modulation unit (modulation step) 2062, an uplink reference signal generation unit (uplink reference signal generation step) 2064, an uplink control signal generation unit (uplink control signal generation step) 2066 , multiplexing section (multiplexing step) 2068 , and radio transmission section (radio transmission step) 2070 .
  • Coding section 2060 convolutionally encodes the uplink data (UL-SCH) input from upper layer processing section 202 under the control of control section 204 (according to the coding rate calculated based on the MCS index), and converts it to LDPC. Encoding such as encoding, polar encoding, and turbo encoding is performed.
  • Modulation section 2062 modulates the coded bits input from coding section 2060 with a modulation method/modulation method predetermined for each channel, such as BPSK, QPSK, 16QAM, 64QAM, and 256QAM, instructed by control section 204. (generate modulation symbols for PUSCH).
  • Uplink reference signal generating section 2064 arranges a physical cell identifier (referred to as PCI, Cell ID, etc.) for identifying base station apparatus 10 and an uplink reference signal, according to an instruction from control section 204.
  • PCI physical cell identifier
  • a sequence determined by a predetermined rule is generated based on the bandwidth, cyclic shift, parameter values for DMRS sequence generation, and frequency allocation.
  • Uplink control signal generation section 2066 encodes UCI, performs BPSK/QPSK modulation, and generates modulation symbols for PUCCH according to instructions from control section 204 .
  • mode 1 or mode 2 can be set as its value.
  • Mode 2 is slot-to-slot hopping, which is a mode in which when transmission is performed using a plurality of slots, the frequency is changed for each slot and transmitted.
  • mode 1 is intra-slot hopping, in which when one or more slots are used for transmission, the slot is divided into a first half and a second half, and the first half and the second half are transmitted with different frequencies.
  • frequency allocation in frequency hopping radio resource allocation in the frequency domain notified by DCI or RRC is applied to the first hop, and frequency allocation of the second hop is applied to the radio resources used in the first hop.
  • Multiplexing unit 2068 uplink scheduling information from the control unit 204 (transmission interval in CS (Configured Scheduling) for uplink included in the RRC message, frequency domain and time domain resource allocation included in DCI, etc.), according to PUSCH , modulation symbols for PUCCH, and uplink reference signals are multiplexed for each transmit antenna port (DMRS port) (that is, each signal is mapped to a resource element).
  • CS Configured Scheduling
  • CS configured scheduling, configured grant scheduling
  • the actual uplink grant is configured via RRC for Configured Grant Type 1 and given via PDCCH processed by CS-RNTI for Configured Grant Type 2.
  • the parameter repK set in the upper layer defines the number of repetitions applied to the transmitted transport block.
  • a parameter repK-RV set in the upper layer indicates a redundancy version pattern to be applied repeatedly. If repK-RV is not set (given), the redundancy version of each actual repeat in the configured grant is set to zero. Otherwise, for the n-th transmission opportunity among all actual iterations (including omitted actual iterations) in the K nominal iterations, the set RV sequence (redundancy version pattern) The transmission associated with the (mod (n ⁇ 1, 4)+1) th value in . Also, the initial transmission of one transport block is started at the first transmission opportunity of K repetitions when the set RV sequence is ⁇ 0, 2, 3, 1 ⁇ .
  • PUSCH repetition type B was specified. Except for PUSCH, which transmits CSI reports without transport blocks, the nominal number of repetitions is given by the higher layer parameter numberofrepetitions.
  • K s be the slot where PUSCH transmission starts
  • N symb be the number of symbols per slot
  • S be the start symbol for the beginning of the slot
  • L be the number of consecutive symbols counted from the symbol S assigned as PUSCH.
  • the slot where repetition starts is given by K s +ceil((S+n ⁇ L)/N symb ), and the start symbol for the beginning of the slot is given by mod(S+n ⁇ L, N symb ).
  • the slot where the nominal repetition ends is K s + ceil ((S + (n + 1) ⁇ L - 1) / N symb ), the end symbol for the beginning of the slot is mod (S + (n + 1) ⁇ L - 1, N symb ).
  • a start RB is determined based on a certain slot number.
  • FIG. 4 shows an example of DMRS arrangement described in Non-Patent Document 2.
  • D denotes a downlink symbol
  • G a guard symbol
  • U an uplink symbol
  • DMRS symbols are hatched.
  • the allocation of DMRSs is biased across S slots and U slots. This is because the DMRS cannot be shared between the S slot and the U slot, that is, the joint channel estimation cannot be applied, so it is necessary to arrange the DMRS at the beginning of the U slot.
  • the accuracy of channel estimation differs depending on the data symbol.
  • Non-Patent Document 2 proposes a smart DMRS arrangement as shown in FIG. 4 as a DMRS arrangement suitable for joint channel estimation.
  • the DMRS is allocated at the beginning of the allocation, and the DMRS is allocated at approximately equal intervals (constant intervals) within the allocation, so data symbols with lower channel estimation accuracy are generated compared to the current specifications. can be made difficult.
  • Non-Patent Document 2 does not disclose signaling for performing smart DMRS arrangement or specific DMRS arrangement criteria, for example, parameters related to joint channel estimation are set, and joint channel estimation is applied according to the parameters. / It is conceivable to decide non-applicability.
  • joint channel estimation the DMRS deployment of the current specifications (up to Release 16) causes a large deviation in channel estimation accuracy. It becomes possible to
  • the range to which joint channel estimation is applied that is, how many symbols in time over which DMRSs are shared may be set by signaling different from RRC signaling for joint channel estimation. Note that the applicable range may be set as a parameter of RRC signaling related to joint channel estimation.
  • the DMRS arrangement of the current specifications can apply multi-user MIMO in which resources are shared at the same frequency and at the same time among multiple terminal devices having the same slot configuration.
  • Application of multi-user MIMO can improve system throughput (cell throughput).
  • joint channel estimation can be set and multi-user MIMO can be applied between transmitters with the same DMRS configuration.
  • joint channel estimation is configured for multiple terminals participating in multi-user MIMO, and the DMRS deployment should also be identical. In other words, since the number of terminal devices that can participate in multi-user MIMO is limited, the possibility of applying multi-user MIMO decreases. As a result, cell throughput is reduced.
  • multi-user MIMO is shown as an example here, multi-user MIMO is not limited as long as it is a technology in which a plurality of terminal devices share radio resources.
  • the same can be said for other techniques such as Non-Orthogonal Multiple Access (NOMA).
  • NOMA Non-Orthogonal Multiple Access
  • the RRC signaling may be signaling related to joint channel estimation, and the parameters of the signaling may be the current specification DMRS arrangement and the smart DMRS arrangement.
  • the signaling When the signaling is set by RRC, transmission is performed by a DMRS transmission method (such as keeping the phase constant) for performing joint channel estimation regardless of the value.
  • a DMRS transmission method such as keeping the phase constant
  • application/non-application of joint channel estimation and setting of DMRS allocation when joint channel estimation is applied can be performed without increasing RRC signaling.
  • the RRC signaling has been described above as an example, the present invention is not limited to RRC signaling and can also be applied to dynamic signaling by DCI. Furthermore, depending on the scheduling method, it may be changed whether the setting is performed by RRC signaling or by DCI.
  • configured grant scheduling type 1 which is a scheduling method in which resources for terminal device transmission are allocated only by RRC signaling
  • application of joint channel estimation is set by RRC signaling
  • configured grant scheduling type 2 or dynamic scheduling in the case of a scheduling method in which resources for terminal device transmission are allocated by DCI
  • application of joint channel estimation may be set by DCI.
  • setting the application of joint channel estimation by DCI above may be only for dynamic scheduling. In this way, by enabling settings for performing joint channel estimation and settings for DMRS allocation, it is possible to match DMRS allocations among a plurality of terminal apparatuses. As a result, there are more opportunities to apply multi-user MIMO, so cell throughput can be increased.
  • Non-Patent Document 3 proposes switching between repeated transmission and single TB transmission by dynamic signaling. As a result, repeated transmission can be applied to secure a low delay, and batch encoding transmission of 1 TB can be performed to improve transmission characteristics, making it possible to perform control according to QoS.
  • FIG. 5 shows an example of repeated transmission.
  • the figure shows an example in which the actual repetition is three times, each consisting of 8 symbols, 2 symbols, and 6 symbols.
  • FIG. 5 is an example of PUSCH mapping type B and the DMRS addition position is set to "pos3".
  • FIG. 6 shows a table showing DMRS positions up to Release 16. From FIG. 6, with PUSCH mapping type B, when the DMRS addition position is "pos3", in the case of 8 symbols, "l 0 , 3, 6", in the case of 2 symbols, "l 0 ", in the case of 6 symbols is "l 0 , 4".
  • FIG. 5 shows an example in which 1 TB is transmitted using resources allocated by multiple repeated transmissions or multiple slot transmissions instead of repeated transmissions.
  • the figure shows an example in which the specifications up to NR release 16 are followed and the DMRS is determined every 14 symbols at maximum. Since the allocation is 16 symbols, it is divided into 14 symbols and 2 symbols. From FIG.
  • FIG. 6 shows an example of PUSCH mapping type B, in which "pos0" is set as the DMRS additional position.
  • DMRS symbols are arranged at positions (positions) of "l 0 , 3, 6, 9" with 14 symbols allocated, and with 2 symbols A DMRS symbol is placed at the position of 'l 0 '.
  • the DMRS allocation for 1 TB transmission has less DMRS bias (only one data symbol between DMRSs) than the DMRS allocation for repeated transmission in the upper part of FIG.
  • the number of DMRS symbols is one less for 1 TB.
  • FIG. 7 shows an example of PUSCH mapping type B, in which "pos0" is set as the DMRS additional position.
  • the DMRS bias (only one data symbol between DMRSs) is reduced. In this way, when switching between repeated transmission and 1 TB transmission by dynamic signaling, the DMRS arrangement is also changed. This allows DMRS deployment to be switched without additional signaling.
  • higher layer signaling such as RRC signaling may be used instead of dynamic signaling.
  • RRC parameters for performing 1 TB transmission may be set, and when the RRC parameters for performing 1 TB transmission are set, DMRS allocation may be smart DMRS allocation.
  • whether to repeat transmission or 1 TB may be set by RRC signaling, and DMRS allocation may be notified by dynamic signaling by DCI.
  • smart DMRS deployment may be applied when RRC parameters (information elements) for smart DMRS deployment are defined and RRC parameters (information elements) for smart DMRS deployment are configured.
  • RRC parameters information elements
  • one of a plurality of parameter sets may be set as the RRC parameter for the smart DMRS deployment, and one value may be designated from the parameter set.
  • the parameter set may specify the number of consecutive slots to apply smart DMRS deployment. By separating signaling in this way, it is possible to dynamically change the arrangement of DMRSs according to the situation of other terminal devices.
  • smart DMRS may be applied by dividing the allocated radio resources by slot boundaries. . Note that when smart DMRS is applied, each DMRS symbol is transmitted with the same power and the same phase (within a predetermined range) in the relevant DMRS.
  • the control unit of the terminal device determines the number of resource elements (N RE ) in the slot as follows when the retransmission is not due to a retransmission request.
  • N SC is the number of frequency domain subcarriers in one physical resource block
  • 12 N symb is the number of symbols in PUSCH allocation
  • N DMRS is for DMRS per PRB indicated by RRC signaling or dynamic signaling.
  • N oh is the overhead set by RRC signaling. If Noh is not configured by RRC signaling, Noh is assumed to be zero.
  • N DMRS is determined assuming a nominal repetition of length (duration) of L symbols without segmentation.
  • n PRB is the total number of PRBs allocated to the terminal device.
  • N info N RE ⁇ R ⁇ Q m ⁇ .
  • R is the target coding rate and Qm is the modulation order, which are calculated from the MCS index and the MCS table notified by RRC signaling or DCI.
  • N info is changed by changing the N RE used for TBS calculation.
  • N' symb may be the actual number of repetitions instead of the nominal number of repetitions.
  • N' RE N SC ⁇ N' symb -N DMRS -N oh .
  • N′ symb the number of symbols allocated for the entire repetition.
  • N DMRS should also be configured, but should be determined considering the number of symbols to be allocated across repetitions.
  • N DMRS 5 in FIG.
  • N DMRS is a value set on the basis of one slot, and the current specifications do not assume the number of symbols exceeding 14 OFDM symbols. Therefore, when there are allocations exceeding 14 symbols, N DMRSs may be set by separating every 14 symbols.
  • the reference value is not fixed at 14, and may be set by RRC signaling or the like.
  • the radio transmission unit 2070 performs IFFT (Inverse Fast Fourier Transform) on the multiplexed signal to generate OFDM symbols.
  • Radio transmission section 2070 adds a CP to the OFDM symbol to generate a baseband digital signal. Further, the radio transmission section 2070 converts the baseband digital signal to an analog signal, removes unnecessary frequency components, converts it to a carrier frequency by up-conversion, amplifies the power, and transmits the signal to the base station via the transmission antenna 208. Send to device 10 .
  • IFFT Inverse Fast Fourier Transform
  • the receiving unit 212 includes a radio receiving unit (radio receiving step) 2120, a demultiplexing unit (demultiplexing step) 2122, a channel estimating unit (channel estimating step) 2144, an equalizing unit (equalizing step) 2126, a demodulating unit ( demodulation step) 2128 and a decoding unit (decoding step) 2130 .
  • Radio receiving section 2120 down-converts the downlink signal received via receiving antenna 210 into a baseband signal, removes unnecessary frequency components, and adjusts the amplification level so that the signal level is appropriately maintained. Based on the in-phase and quadrature components of the received signal, it performs quadrature demodulation, and converts the quadrature-demodulated analog signal to a digital signal. Radio receiving section 2120 removes the portion corresponding to the CP from the converted digital signal, performs FFT on the CP-removed signal, and extracts the signal in the frequency domain.
  • the demultiplexing unit 2122 demultiplexes the extracted frequency-domain signals into downlink reference signals, PDCCH, PDSCH, and PBCH.
  • a channel estimator 2124 estimates a frequency response (or delay profile) using a downlink reference signal (DM-RS, etc.).
  • a frequency response result obtained by channel estimation for demodulation is input to equalization section 1126 .
  • the propagation path estimation unit 2124 uses a downlink reference signal (such as CSI-RS) to measure uplink channel conditions (RSRP (Reference Signal Received Power), RSRQ (Reference Signal Received Quality), RSSI (Received Signal Strength Indicator) and SINR (Signal to Interference plus Noise power Ratio) measurement).
  • RSRP Reference Signal Received Power
  • RSRQ Reference Signal Received Quality
  • RSSI Receiveived Signal Strength Indicator
  • SINR Signal to Interference plus Noise power Ratio
  • the equalization section 2126 generates equalization weights based on the MMSE criterion from the frequency response input from the channel estimation section 2124 .
  • Equalization section 2126 multiplies the input signal (PUCCH, PDSCH, PBCH, etc.) from demultiplexing section 2122 by the equalization weight.
  • the demodulation section 2128 performs demodulation processing based on information on the modulation order determined in advance/instructed by the control section 204 .
  • the decoding unit 2130 performs decoding processing on the output signal of the demodulation unit 2128 based on the coding rate information instructed by the predetermined coding rate/control unit 204 .
  • the decoding unit 2130 inputs the decoded data (DL-SCH etc.) to the upper layer processing unit 202 .
  • a reference repetition unit (number of OFDM symbols) L and repetition number K are notified from the base station apparatus to the terminal apparatus by RRC signaling or DCI.
  • the number of symbols of L ⁇ K is not necessarily continuously reserved for uplink use. That is, in the case of TDD (Time Division Multiplexing), downlink (DL) and guard symbol allocation are required, and uplink resources cannot be secured continuously, and there is a possibility that part (or all) of the allocation cannot be used.
  • the specifications up to Release 16 define nominal repetitions, including invalid symbols due to DL assignments, etc., and define actual repetitions in consideration of invalid symbols. .
  • the 1 symbol is a data symbol instead of a DMRS, resulting in excess DMRS.
  • one OFDM symbol may be composed of OFDM symbols including both DMRS and data.
  • PUSCH mapping type B and repetition type B
  • FIG. 10 shows an example of repetition, RRC signaling and/or dynamic signaling may be used to transmit one transport block on one PUSCH instead of actual repetition.
  • the redundancy version is changed for each repetition, but when DMRS is transmitted in repeated transmission of one (single) symbol, it is not regarded as an actual repetition, and a redundancy indicating a puncture pattern in an encoded bit sequence is used. It may not be counted because it is a Darcy version change. However, when an OFDM symbol including both DMRS and data signals is transmitted, it may be counted for changing the redundancy version.
  • DMRS transmission instead, either no transmission, data transmission, or OFDM transmission consisting of DMRS and data may be performed.
  • frequency offset related to frequency hopping is set to 0 and transmission is actually performed on the same frequency, if frequency hopping is set by RRC signaling or the like, no transmission, data transmission, Alternatively, either OFDM transmission consisting of DMRS and data may be performed.
  • the program that runs on the device related to the present invention may be a program that controls the Central Processing Unit (CPU) and the like to make the computer function so as to realize the functions of the above-described embodiments related to the present invention.
  • the program or information handled by the program is temporarily read into volatile memory such as Random Access Memory (RAM) during processing, or stored in non-volatile memory such as flash memory or Hard Disk Drive (HDD),
  • RAM Random Access Memory
  • HDD Hard Disk Drive
  • the CPU reads, modifies, and writes accordingly.
  • part of the devices in the above-described embodiments may be realized by a computer.
  • the program for realizing the functions of the embodiment may be recorded in a computer-readable recording medium. It may be realized by causing a computer system to read and execute the program recorded on this recording medium.
  • the "computer system” here is a computer system built in the device, and includes hardware such as an operating system and peripheral devices.
  • the "computer-readable recording medium” may be any of semiconductor recording media, optical recording media, magnetic recording media, and the like.
  • “computer-readable recording medium” means a medium that dynamically stores programs for a short period of time, such as a communication line for transmitting a program via a network such as the Internet or a communication line such as a telephone line.
  • a communication line for transmitting a program via a network such as the Internet or a communication line such as a telephone line.
  • a volatile memory inside a computer system that serves as a server or a client in that case may also include something that holds the program for a certain period of time.
  • the program may be for realizing part of the functions described above, or may be capable of realizing the functions described above in combination with a program already recorded in the computer system.
  • each functional block or feature of the apparatus used in the embodiments described above may be implemented or performed in an electrical circuit, typically an integrated circuit or multiple integrated circuits.
  • An electrical circuit designed to perform the functions described herein may be a general purpose processor, digital signal processor (DSP), application specific integrated circuit (ASIC), field programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic, discrete hardware components, or combinations thereof.
  • a general-purpose processor may be a microprocessor, or any conventional processor, controller, microcontroller, or state machine.
  • the electric circuit described above may be composed of a digital circuit, or may be composed of an analog circuit.
  • an integrated circuit technology that replaces current integrated circuits emerges due to advances in semiconductor technology, it is also possible to use integrated circuits based on this technology.
  • the present invention is not limited to the above-described embodiments.
  • an example of the device was described, but the present invention is not limited to this, and stationary or non-movable electronic equipment installed indoors and outdoors, such as AV equipment, kitchen equipment, It can be applied to terminal devices or communication devices such as cleaning/washing equipment, air conditioning equipment, office equipment, vending machines, and other household equipment.
  • the present invention is suitable for use in base station apparatuses, terminal apparatuses, and communication methods.

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Abstract

L'invention concerne un dispositif terminal qui effectue une transmission vers un dispositif de station de base, le dispositif terminal comprenant : une unité de traitement de couche supérieure qui reçoit, en provenance du dispositif de station de base, une signalisation de couche supérieure comprenant deux paramètres d'une unité de répétition et le nombre de répétitions ; une unité de commande qui, en utilisant la signalisation de couche supérieure et un champ prescrit inclus dans des informations de commande de liaison descendante, commute entre une première transmission qui effectue une transmission répétitive à l'aide des deux paramètres et une seconde transmission qui transmet un bloc de transport à l'aide d'une ressource sans fil attribuée par les deux paramètres ; et une unité de multiplexage qui commute entre un agencement DMRS associé à la première transmission et un agencement DMRS associé à la seconde transmission au moyen du champ prescrit inclus dans les informations de commande de liaison descendante.
PCT/JP2022/008703 2021-03-04 2022-03-02 Équipement terminal et dispositif de station de base WO2022186230A1 (fr)

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US20220312442A1 (en) * 2021-03-23 2022-09-29 Qualcomm Incorporated Uplink configured grant transmission repetition techniques in wireless communications
US11968662B2 (en) * 2021-03-23 2024-04-23 Qualcomm Incorporated Uplink configured grant transmission repetition techniques in wireless communications

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