WO2022030598A1 - Terminal device and base station device - Google Patents

Abstract

According to the present invention, during repeated transmissions, on the assumption that a repeated transmission signal and a reference signal can be shared, transmission is performed by changing the frequency of the reference signals in accordance with a redundancy version of each repeated transmission. When the redundancy version is zero, DMRS's are placed as set by RRC signaling. When the redundancy version is other than zero, the DMRS's are reduced from the placement set by RRC signaling.

Description

Terminal equipment and base station equipment

The present invention relates to a terminal device, a base station device, and a communication method thereof.
The present application claims priority with respect to Japanese Patent Application No. 2020-134327 filed in Japan on August 7, 2020, the contents of which are incorporated herein by reference.

In the NR (New Radio) communication system specified by 3GPP (Third Generation Partnership Project), an OFDM symbol containing one or more DMRS (Demodulation Reference Signal) in a slot composed of multiple OFDM symbols is used. It is designed to be inserted. The receiver receiving the transmitted slot performs channel estimation using the DMRS in the slot and demodulates the data signal in the slot.

Also, in NR Release 15, repeated transmission between slots is specified in order to improve communication reliability and expand coverage. In inter-slot repetition, the same data can be repeatedly transmitted in a plurality of slots. However, since a plurality of slots are required for repeated transmission, there is a problem in terms of delay. Therefore, in NR release 16, repeated transmission in the slot is specified. In the repeated transmission in the slot, the repeating unit can be set a plurality of times in the slot and the transmission can be performed.

In the specifications up to Rel-16, the DMRS that can be used for channel estimation was limited to within repeating units or slots, but channel estimation can be performed by using DMRS contained in different repeating units or different slots. The accuracy can be greatly improved. Therefore, in NR Release 17, DMRS sharing (DMRS bundling) that enables the use of DMRS contained in different repeating units or different slots is being studied. (Non-Patent Document 1)

DMRS sharing (DMRS bundling) is effective not only when moving at low speed but also when moving at high speed.

Although DMRS sharing has been proposed in 3GPP, the method of actually introducing it into the system has not been examined. Further, as a method of expanding the coverage, not only DMRS sharing but also other technologies can be considered.

One aspect of the present invention has been made in view of such circumstances, and an object thereof is to expand the coverage by changing the policy method of DMRS and the control information related to DMRS.

The configuration of the base station device, the terminal device, and the communication method according to one aspect of the present invention in order to solve the above-mentioned problems is as follows.

(1) One aspect of the present invention is a terminal device that communicates with a base station device by repeated transmission, and constitutes a slot and an upper layer processing unit that sets the number of repetitions in the repeated transmission and the redundancy version in the repeated transmission. The slot component changes the number of reference signals in each repeat transmission based on the redundancy version in the repeat transmission.
(2) In one aspect of the present invention, the slot component refers to a smaller number of references than the reference signal in the repeated transmission in which the redundancy version is set to 0 in the repeated transmission in which the value other than 0 is set. Signals are included.
(3) In one aspect of the present invention, the slot component transmits a reference signal only by repeated transmission in which 0 is set as the redundancy version.
(4) One aspect of the present invention is a base station device that communicates with a terminal device by repeated transmission, and constitutes a slot and an upper layer processing unit that sets the number of repetitions in the repeated transmission and the redundancy version in the repeated transmission. The slot component changes the number of reference signals in each repeat transmission based on the redundancy version in the repeat transmission.
(5) In one aspect of the present invention, the slot component has a smaller number of references than the reference signal in the repeated transmission in which the redundancy version is set to 0 in the repeated transmission in which the value other than 0 is set. Signals are included.
(6) In one aspect of the present invention, the slot component transmits a reference signal only by repeated transmission in which 0 is set as the redundancy version.

According to one or more aspects of the present invention, communication reliability can be improved and communication coverage can be expanded.

It is a figure which shows the configuration example of the communication system 1 which concerns on this embodiment. It is a figure which shows the configuration example of the base station apparatus which concerns on this embodiment. It is a figure which shows the configuration example of the terminal apparatus which concerns on this embodiment. It is a figure which shows an example of DMRS sharing which concerns on this embodiment. It is a figure which shows an example of DMRS sharing at the time of frequency hopping which concerns on this embodiment. It is a figure which shows an example of the DMRS arrangement by the RV pattern which concerns on this embodiment.

The communication system according to the present embodiment includes a base station device (cell, small cell, serving cell, component carrier, eNodeB, Home eNodeB, gNodeB) and a terminal device (terminal, mobile terminal, UE: User Equipment). In the communication system, in the case of downlink, the base station device is a transmitting device (transmitting point, transmitting antenna group, transmitting antenna port group, TRP (Tx / RxPoint)), and the terminal device is a receiving device (receiving point, receiving terminal). , Received antenna group, Received antenna port group). In the case of uplink, the base station device is the receiving device and the terminal device is the transmitting device. The communication system is also applicable to D2D (Device-to-Device, sidelink) communication. In that case, both the transmitting device and the receiving device become terminal devices.

The communication system is not limited to data communication between a terminal device and a base station device in which a human intervenes. That is, 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. (hereinafter referred to as MTC). It can also be applied to a form of data communication that does not require. In this case, the terminal device becomes an MTC terminal. As the communication system, a multi-carrier transmission method such as CP-OFDM (Cyclic Prefix-Orthogonal Frequency Division Multiplexing) can be used for the uplink and the downlink. The communication system is also referred to as DFTS-OFDM (Discrete Fourier Transform Spread-Orthogonal Frequency Division Multiplexing, SC-FDMA) to which Transform precoding is applied, that is, DFT is applied when upper layer parameters related to Transform precursor are set in the uplink. Use a transmission method such as). In the following, the case where the OFDM transmission method is used for the uplink and the downlink will be described, but the present invention is not limited to this, and other transmission methods can be applied.

The base station device and the terminal device in the present embodiment are a so-called licensed band, and / or a frequency band for which a license has been obtained from the country or region where the wireless operator provides the service. It is possible to communicate in a frequency band called an unlicensed band, which does not require a license from the country or region.

In this embodiment, "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".

(First Embodiment)
FIG. 1 is a diagram showing a configuration example of the communication system 1 according to the present embodiment. The communication system 1 in the present embodiment includes a base station device 10 and a terminal device 20. The coverage 10a is a range (communication area) in which the base station device 10 can connect (communicate) with the terminal device 20 (also referred to as a cell). The base station device 10 can accommodate a plurality of terminal devices 20 in the coverage 10a.

In FIG. 1, the uplink radio communication r30 includes at least the following uplink physical channels: The uplink physical channel is used to transmit the information output from the upper layer.
-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 an acknowledgment (positive acknowledgement: ACK) / a negative response (Negative acknowledgment: NACK) to the downlink data. Here, the downlink data 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 referred to as HARQ-ACK (Hybrid Automatic Repeat request ACKnowledgement), HARQ feedback, HARQ response, or HARQ control information, a signal indicating delivery confirmation.

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 the other PUCCHs are composed of 4 to 14 OFDM symbols. It is also composed of bandwidth 12 subcarriers of PUCCH format 0 and PUCCH format 1. Further, in PUCCH format 0, 1-bit (or 2-bit) ACK / NACK is transmitted by a resource element having 12 subcarriers and 1 OFDM symbol (or 2 OFDM symbol).

The uplink control information includes a scheduling request (Scheduling Request: SR) used to request a PUSCH (Uplink-Shared Channel: UL-SCH) resource for initial transmission. The scheduling request indicates that the UL-SCH resource for initial transmission is requested.

The uplink control information includes the downlink channel state information (Channel State Information: CSI). The downlink channel state information includes a rank index (RankIndicator: RI) indicating a suitable spatial multiplex (number of layers), a precoding matrix index (Precoding MatrixIndicator: PMI) indicating a suitable precoder, and a suitable transmission rate. Includes Channel Quality Indicator (CQI), etc. The PMI represents a codebook determined by the terminal device. The codebook relates to the pre-recording of physical downlink shared channels.

In NR, the upper layer parameter RI limit can be set. There are multiple setting parameters for the RI limit, one is the type 1 single panel RI limit, which consists of 8 bits. The type 1 single panel RI limitation, which is a bitmap parameter, forms the bit series r ₇ , ... r ₂ , r ₁ . Here, r ₇ is the MSB (Most Significant Bit), and r ₀ is the LSB (Least Significant Bit). When r _i is zero (i is 0, 1, ... 7), PMI and RI reporting corresponding to the precoder associated with the i + 1 layer is not allowed. The RI limitation includes a type 1 multi-panel RI limitation in addition to the type 1 single panel RI limitation, and is composed of 4 bits. The type ₁ multi _- panel RI limitation, which is a bitmap parameter, forms the bitstreams _r4 , r3 _, r2, r1. Where r ₄ is the MSB and r ₀ is the LSB. When r _i is zero (i is 0, 1, 2, 3), PMI and RI reporting corresponding to the precoder associated with the i + 1 layer is not allowed.

As the CQI, a suitable modulation method (for example, QPSK, 16QAM, 64QAM, 256QAMAM, etc.), a coding rate (coding rate), and an index (CQI index) indicating frequency utilization efficiency in a predetermined band can be used. The terminal device selects from the CQI table the CQI index that the PDSCH transport block will be able to receive without exceeding the block error probability (BLER) = 0.1. However, when the predetermined CQI table is set by the upper layer signaling, the CQI index that can be received without exceeding BLER = 0.00001 is selected from the CQI table.

PUSCH is a physical channel used for transmitting uplink data (UplinkTransportBlock, Uplink-SharedChannel: UL-SCH), and CP-OFDM or DFT-S-OFDM is applied as a transmission method. To. The PUSCH may be used together with the uplink data to transmit control information such as HARQ-ACK and / or channel state information for the downlink data. PUSCH may be used to transmit only channel state information. PUSCH may be used to transmit only HARQ-ACK and channel state information.

PUSCH is used to transmit radio resource control (RRC) signaling. RRC signaling is also referred to as RRC message / RRC layer information / RRC layer signal / RRC layer parameter / RRC information element. RRC signaling is information / signals processed in the radio resource control layer. The RRC signaling transmitted from the base station device may be a signal common to a plurality of terminal devices in the cell. The RRC signaling transmitted from the base station device may be dedicated signaling (also referred to as dedicated signaling) to a certain terminal device. That is, user device specific (user device specific) information is transmitted to a certain terminal device using dedicated signaling. The RRC message can include the UE Capability 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 / signal processed (transmitted) in the medium access control layer. For example, the power headroom may be included in the 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 is also referred to as higher layer signaling. RRC signaling and / or MAC CE is included in the transport block.

PRACH is used to transmit the preamble used for random access. PRACH is used to send a random access preamble. The PRACH is used to indicate an initial connection establishment procedure, a handover procedure, a connection re-establishment procedure, synchronization (timing adjustment) for uplink transmission, and a request for PUSCH (UL-SCH) resources. Used for.

In uplink wireless communication, an uplink reference signal (Uplink Reference Signal: ULRS) is used as an uplink physical signal. The uplink reference signal includes a demodulation reference signal (Demodulation Reference Signal: DMRS), a sounding reference signal (Sounding Reference Signal: SRS), a phase tracking signal (Phase Tracking Reference Signal: PTRS), and the like. DMRS is associated with the transmission of physical uplink shared channels / physical uplink control channels. For example, the base station apparatus 10 uses a demodulation reference signal to perform demodulation path estimation / propagation path correction when demodulating a physical uplink shared channel / physical uplink control channel.

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 the channel state of the uplink (CSI Measurement).

PTRS is related to the transmission of the physical uplink shared channel / physical uplink control channel. The base station apparatus 10 uses PTRS for phase tracking.

In FIG. 1, in the wireless communication of the downlink r31, at least the following downlink physical channels are used. The downlink physical channel is used to transmit the information output from the upper layer.
-Physical notification channel (PBCH)
-Physical downlink control channel (PDCCH)
-Physical downlink shared channel (PDSCH)

PBCH is used to notify the master information block (Master Information Block: MIB, Broadcast Channel: BCH) commonly used in terminal devices. MIB is one of the system information. For example, the MIB includes a downlink transmission bandwidth setting and a system frame number (SFN: SystemFrame number). The MIB may include information indicating at least a portion of the slot number, subframe number, and radio frame number to which the PBCH is transmitted.

PDCCH is used to transmit downlink control information (DCI). The downlink control information is defined in a plurality of formats (also referred to as DCI formats) based on the intended use. The DCI format may be defined based on the type of DCI and the number of bits constituting one DCI format. Each format is used according to the application. The downlink control information includes control information for transmitting downlink data and control information for transmitting uplink data. The DCI format for transmitting downlink data is also referred to as a downlink assignment (or downlink grant). The DCI format for uplink data transmission is also referred to as an uplink grant (or uplink assignment).

One downlink assignment is used for scheduling one PDSCH in one serving cell. The downlink grant may be at least used for scheduling PDSCH in the same slot in which the downlink grant was transmitted. The 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 instructing initial transmission or retransmission, and HARQ for downlink. It includes information indicating the process number and downlink control information such as Redundancy version indicating the amount of redundancy added to the codeword during error correction coding. The code word is the data after error correction encoding. 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 (number of repeated transmissions) indicating the number of times the PUSCH is repeatedly transmitted. The DCI format for transmitting each downlink data includes information (fields) necessary for its use among the above information.

One uplink grant is used to notify the terminal device of the scheduling of one PUSCH in one serving cell. The uplink grant has information on resource block allocation for transmitting PUSCH (resource block allocation and hopping resource allocation), time domain resource allocation, information on PUSCH MCS (MCS / Redundance version), information on DMRS port, and PUSCH. Includes uplink control information such as retransmission information, TPC commands for PUSCH, downlink channel state information (CSI) request (CSI request), and so on. The uplink grant may include information indicating the HARQ process number in the uplink, information indicating the redundancy version, a transmission power control (TPC) command for PUCCH, and a TPC command for PUSCH. The DCI format for transmitting each uplink data includes information (fields) necessary for the purpose of the above information.

The OFDM symbol number (position) that transmits the DMRS symbol is the OFDM symbol at the beginning of the slot and the last OFDM symbol of the PUSCH resource scheduled for that slot, if intra-frequency hopping is not applied and for PUSCH mapping type A. Given by the signaled period between. Intra-frequency hopping is not applied and for PUSCH mapping type B, the OFDM symbol number (position) for transmitting the DMRS symbol is given by the scheduled PUSCH resource period. If intra-frequency hopping is applied, it is given in time per hop. For PUSCH mapping type A, only when the upper layer parameter indicating the position of the first DMRS is 2, the case where the upper layer parameter indicating the number of additional DMRSs is 3 is supported. Further, regarding the PUSCH mapping type A, the 4-symbol period can be applied only when the upper layer parameter indicating the position of the head DMRS is 2.

PDCCH is generated by adding a cyclic redundancy check (Cyclic Redundancy Check: CRC) to the downlink control information. In PDCCH, the CRC parity bit is scrambled (also referred to as exclusive-OR operation, mask) using a predetermined identifier. The parity bit is 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) -Scrambled by RNTI, MCS-C-RNTI. C-RNTI and CS-RNTI are identifiers for identifying a terminal device in a cell. The Temporary C-RNTI is an identifier for identifying the terminal device that transmitted the random access preamble during the contention-based random access procedure. C-RNTI and Temporary C-RNTI are used to control PDSCH or PUSCH transmissions in a single subframe. CS-RNTI is used to periodically allocate PDSCH or PUSCH resources. Here, the PDCCH (DCI format) scrambled by CS-RNTI is used to activate or deactivate CS type 2. On the other hand, in CS type 1, 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 the CS activation (setting) is performed by the upper layer parameters. conduct. P-RNTI is used to send a paging message (Paging Channel: PCH). SI-RNTI is used to transmit SIB. RA-RNTI is used to send a random access response (message 2 in a random access procedure). SP-CSI-RNTI is used for quasi-static CSI reporting. MCS-C-RNTI is used in selecting MCS tables with low spectral efficiency.

PDSCH is used to transmit downlink data (downlink transport block, DL-SCH). The PDSCH is used to transmit a system information message (also referred to as System Information Block: SIB). Part or all of the SIB may be included in the RRC message.

PDSCH is used to transmit RRC signaling. The RRC signaling transmitted from the base station device may be common (cell-specific) to a plurality of terminal devices in the cell. That is, information common to user devices in the cell is transmitted using cell-specific RRC signaling. The RRC signaling transmitted from the base station device may be a message (also referred to as dedicated signaling) dedicated to a certain terminal device. That is, user device specific (user device specific) information is transmitted to a certain terminal device using a dedicated message.

PDSCH is used to transmit MAC CE. RRC signaling and / or MAC CE is also referred to as higher layer signaling. PMCH is used to transmit multicast data (Multicast Channel: MCH).

In the downlink wireless communication shown in FIG. 1, a synchronization signal (Synchronization signal: SS) and a downlink reference signal (Downlink Reference Signal: DLRS) are used as downlink physical signals. The downlink physical signal is not used to transmit the information output from the upper layer, but is used by the physical layer.

The synchronization signal is used by the terminal device to synchronize the frequency domain and the time domain of the downlink. The downlink reference signal is used by the terminal device to perform propagation path estimation / propagation path correction of the downlink physical channel. For example, the downlink reference signal is used to demodulate the PBCH, PDSCH, PDCCH. The downlink reference signal can also be used by the terminal device to measure the channel state of the downlink (CSI measurement).

The downlink physical channel and the downlink physical signal are collectively referred to as a downlink physical signal. Further, the uplink physical channel and the uplink physical signal are generically referred to as an uplink signal. Further, the downlink physical channel and the uplink physical channel are collectively referred to as a physical channel. Further, the downlink physical signal and the uplink physical signal are collectively referred to as a physical signal.

BCH, UL-SCH and DL-SCH are transport channels. The channel used in the MAC layer is called a transport channel. The unit of the transport channel used in the MAC layer is also referred to as a transport block (TB: Transport Block) or a MAC PDU (Protocol Data Unit). A transport block is a unit of data that the MAC layer delivers to the physical layer. In the physical layer, the transport block is mapped to a code word, and coding processing or the like is performed for each code word.

FIG. 2 is a schematic block diagram of the configuration of the base station apparatus 10 according to the present embodiment. The base station apparatus 10 includes an upper layer processing unit (upper layer processing step) 102, a control unit (control step) 104, a transmission unit (transmission step) 106, a transmission antenna 108, a reception antenna 110, and a reception unit (reception step) 112. Consists of including. The transmission unit 106 generates a physical downlink channel according to the logical channel input from the upper layer processing unit 102. The transmission unit 106 includes a coding unit (coding step) 1060, a modulation unit (modulation step) 1062, a downlink control signal generation unit (downlink control signal generation step) 1064, and a downlink reference signal generation unit (downlink reference signal). The generation step) 1066, the multiplex unit (multiplex step) 1068, and the wireless transmission unit (radio transmission step) 1070 are included. The receiving unit 112 detects the physical uplink channel (demodulation, decoding, etc.) 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 propagation path estimation unit (propagation path estimation step) 1122, a multiple separation unit (multiple separation step) 1124, an equalization unit (equalization step) 1126, and a demodulation unit (demodulation unit). It includes a demodulation step) 1128 and a decoding unit (decoding step) 1130.

The upper layer processing unit 102 includes a medium access control (MAC) layer, a packet data integration protocol (Packet Data Convergence Protocol: PDCP) layer, a radio link control (Radio Link Control: RLC) layer, and a radio resource control (Radio). ResourceControl: RRC) Processes layers higher than physical layers such as layers. The upper layer processing unit 102 generates information necessary for controlling the transmission unit 106 and the reception unit 112, and outputs the information to the control unit 104. The upper layer processing unit 102 outputs downlink data (DL-SCH or the like), system information (MIB, SIB), or the like to the transmission unit 106. Note that the DMRS configuration information may be notified to the terminal device by system information (MIB or SIB) instead of notification by a higher layer such as RRC.

The upper layer processing unit 102 generates or acquires system information (MIB or a part of SIB) to be broadcast from the upper node. The upper layer processing unit 102 outputs the system information to be broadcast to the transmission unit 106 as BCH / DL-SCH. The MIB is arranged in the PBCH in the transmission unit 106. The SIB is arranged in the PDSCH in the transmission unit 106. The upper layer processing unit 102 generates system information (SIB) peculiar to the terminal device or acquires it from a higher degree. The SIB is arranged in the PDSCH in the transmission unit 106.

The upper layer processing unit 102 sets various RNTIs for each terminal device. The RNTI is used for encryption (scramble) of PDCCH, PDSCH and the like. The upper layer processing unit 102 outputs the RNTI to the control unit 104 / transmission unit 106 / reception unit 112.

In the upper layer processing unit 102, the downlink data (transport block, DL-SCH) arranged in the PDSCH, the system information (System Information Block: SIB) unique to the terminal device, the RRC message, the MAC CE, and the DMRS configuration information are SIB. System information such as and MIB, and DMRS configuration information when not notified by DCI are generated or acquired from a higher-level node and output to the transmission unit 106. The upper layer processing unit 102 manages various setting information of the terminal device 20. Note that some of the radio resource control functions 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 a function supported by the terminal device (UE capability) from the terminal device 20 (via the receiving unit 112). The terminal device 20 transmits its own function to the base station device 10 by a signal (RRC signaling) of an upper layer. Information about a terminal device includes information indicating whether the terminal device supports a predetermined function or information indicating that the terminal device has been introduced and tested for a predetermined function. Support for a given feature includes whether it has been installed and tested for a given feature.

When the terminal device supports a predetermined function, the terminal device transmits information (parameter) indicating whether or not the predetermined function is supported. If the terminal device does not support a predetermined function, the terminal device may not send information (parameter) indicating whether or not the predetermined function is supported. That is, whether or not to support the predetermined function is notified by whether or not to send information (parameter) indicating whether or not to support the predetermined function. Information (parameter) indicating whether or not a predetermined function is supported may be notified using 1 bit of 1 or 0.

The upper layer processing unit 102 acquires DL-SCH from the uplink data (including CRC) after decoding from the receiving unit 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 performed in 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. The control unit 104 generates downlink control information (DCI) based on the setting information input from the upper layer processing unit 102 / reception unit 112, and outputs the downlink control information (DCI) to the transmission unit 106. For example, the control unit 104 considers the setting information (whether the DMRS configuration 1 or the DMRS configuration 2) regarding the DMRS input from the upper layer processing unit 102 / reception unit 112, and considers the frequency arrangement of the DMRS (DMRS configuration 1). In the case of, an even-numbered subcarrier or an odd-numbered subcarrier, and in the case of DMRS configuration 2, any of the 0th to 2nd sets) is set, and DCI is generated.

The control unit 104 determines the MCS of the PUSCH in consideration of the channel quality information (CSI Measurement result) measured by the propagation path estimation unit 1122. The control unit 104 determines the MCS index corresponding to the MCS of the PUSCH. The control unit 104 includes the determined MCS index in the uplink grant.

The transmission unit 106 generates PBCH, PDCCH, PDSCH, downlink reference signal, and the like according to the signal input from the upper layer processing unit 102 / control unit 104. The coding unit 1060 uses a predetermined coding method for BCH, DL-SCH, etc. input from the upper layer processing unit 102, and a block code, a convolution code, and a turbo. Coding (including repetition) with a code, polar coding, LDPC code, or the like is performed. The coding unit 1060 punctures the coding bit based on the coding rate input from the control unit 104. The modulation unit 1062 data-modulates the coding bits input from the coding unit 1060 by a modulation method (modulation order) input from a predetermined / control unit 104 such as BPSK, QPSK, 16QAM, 64QAM, 256QAM. .. The modulation order is based on the MCS index selected by the control unit 104.

The downlink control signal generation unit 1064 adds CRC to the DCI input from the control unit 104. The downlink control signal generation unit 1064 performs encryption (scramble) on the CRC using RNTI. Further, the downlink control signal generation unit 1064 performs QPSK modulation on the DCI to which the CRC is added to generate PDCCH. The downlink reference signal generation unit 1066 generates a series known by the terminal device as a downlink reference signal. The known sequence is obtained by a predetermined rule based on a physical cell identifier for identifying the base station apparatus 10.

The multiplexing unit 1068 multiplexes the modulation symbols of each channel input from the PDCCH / downlink reference signal / modulation unit 1062. That is, the multiplexing unit 1068 maps the PDCCH / downlink reference signal to the resource element with the modulation symbol of each channel. The resource element to be mapped is controlled by the downlink scheduling input from the control unit 104. A resource element is the smallest unit of a physical resource consisting of one OFDM symbol and one subcarrier. A resource block (RB) is composed of a plurality of resource elements, and scheduling is applied with the RB as the minimum unit. When performing MIMO transmission, the transmission unit 106 includes a coding unit 1060 and a modulation unit 1062 in the number of layers. In this case, the upper layer processing unit 102 sets the MCS for each transport block of each layer.

The wireless transmission unit 1070 generates an OFDM symbol by performing an inverse fast Fourier transform (IFFT) on a multiplexed modulation symbol or the like. The radio transmission unit 1070 adds a cyclic prefix (CP) to the OFDM symbol to generate a baseband digital signal. Further, the radio transmission unit 1070 converts the digital signal into an analog signal, removes an excess frequency component by filtering, up-converts it to a carrier frequency, amplifies the power, and outputs the digital signal to the transmission antenna 108 for transmission.

The receiving unit 112 detects (separates, demodulates, decodes) the received signal from the terminal device 20 via the receiving antenna 110 according to the instruction of the control unit 104, and transmits the decoded data to the upper layer processing unit 102 / control unit 104. input. The radio reception unit 1120 converts the uplink signal received via the reception antenna 110 into a baseband signal by down-conversion, removes unnecessary frequency components, and amplifies the signal level so as to be properly maintained. The level is controlled, and based on the in-phase component and the quadrature component of the received signal, quadrature demodulation is performed and the quadrature demodulated analog signal is converted into a digital signal. The radio receiving unit 1120 removes a portion corresponding to the CP from the converted digital signal. The radio receiving unit 1120 performs a fast Fourier transform (FFT) on the signal from which the CP has been removed, and extracts the signal in the frequency domain. The signal in the frequency domain is output to the multiplex separation unit 1124.

The multiplex separation unit 1124 uses the signal input from the radio reception unit 1120 as a PUSCH, PUCCH and uplink reference signal based on the uplink scheduling information (uplink data channel allocation information, etc.) input from the control unit 104. Separate into signals such as. The separated uplink reference signal is input to the propagation path estimation unit 1122. The separated PUSCH and PUCCH are output to the equalization unit 1126.

The propagation path estimation unit 1122 estimates the frequency response (or delay profile) using the uplink reference signal. The frequency response result estimated for the propagation path for demodulation is input to the equalization unit 1126. The propagation path estimation unit 1122 uses the uplink reference signal to measure the uplink channel status (RSRP (Reference Signal Received Power), RSRQ (Reference Signal Received Quality), RSSI (Received Signal Strength Indicator) measurement). conduct. The measurement of the uplink channel status is used for determining the MCS for the PUSCH and the like.

The equalization unit 1126 performs a process of compensating for the influence on the propagation path from the frequency response input from the propagation path estimation unit 1122. As the compensation method, any existing propagation path compensation such as a method of multiplying an MMSE weight or an MRC weight or a method of applying an MLD can be applied. The demodulation unit 1128 performs demodulation processing based on predetermined modulation method information instructed by the control unit 104.

The decoding unit 1130 performs decoding processing on the output signal of the demodulation unit based on the information of the coding rate specified in advance from the coding rate / control unit 104. The decoding unit 1130 inputs the decrypted data (UL-SCH or the like) to the upper layer processing unit 102.

FIG. 3 is a schematic block diagram showing the configuration of the terminal device 20 in the present embodiment. The terminal device 20 includes an upper layer processing unit (upper layer processing step) 202, a control unit (control step) 204, a transmission unit (transmission step) 206, a transmission antenna 208, a reception antenna 210, and a reception unit (reception 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 wireless link control (RLC) layer, and the wireless resource control (RRC) layer. The upper layer processing unit 202 manages various setting information of the own terminal device. The upper layer processing unit 202 notifies the base station device 10 of information (UECapability) indicating the function of the terminal device supported by the own terminal device via the transmission unit 206. The upper layer processing unit 202 notifies UE Capability by RRC signaling.

The upper layer processing unit 202 acquires the decrypted data such as DL-SCH and BCH from the receiving unit 212. The upper layer processing unit 202 generates HARQ-ACK from the error detection result of the DL-SCH. The upper layer processing unit 202 generates SR. The upper layer processing unit 202 generates a UCI including HARQ-ACK / SR / CSI (including a CQI report). Further, when the DMRS configuration information is notified by the upper layer, the upper layer processing unit 202 inputs the information regarding the DMRS configuration to the control unit 204. The upper layer processing unit 202 inputs the UCI and UL-SCH to the transmission unit 206. A 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 reception unit 212. The control unit 204 controls the transmission unit 206 according to the PUSCH scheduling / MCS index / TPC (Transmission Power Control) acquired from the DCI for uplink transmission. The control unit 204 controls the reception unit 212 according to the PDSCH scheduling / MCS index acquired from the DCI for downlink transmission. Further, the control unit 204 specifies the frequency arrangement of the DMRS according to the information regarding the frequency arrangement (port number) of the DMRS included in the DCI for downlink transmission and the DMRS configuration information input from the upper layer processing unit 202. ..

The transmission unit 206 includes a coding unit (coding step) 2060, a modulation unit (modulation step) 2062, an uplink reference signal generation unit (uplink reference signal generation step) 2064, and an uplink control signal generation unit (uplink control signal). The generation step) 2066, the multiplex unit (multiplex step) 2068, and the wireless transmission unit (radio transmission step) 2070 are included.

The coding unit 2060 convolves and encodes the uplink data (UL-SCH) input from the upper layer processing unit 202 according to the control of the control unit 204 (according to the coding rate calculated based on the MCS index), and LDPC. Coding such as coding, polar coding, turbo coding, etc. is performed.

The modulation unit 2062 modulates the coding bit input from the coding unit 2060 by the modulation method / channel predetermined modulation method instructed by the control unit 204 such as BPSK, QPSK, 16QAM, 64QAM, 256QAM. (Generates a modulation symbol for PUSCH).

The uplink reference signal generation unit 2064 arranges a physical cell identifier (referred to as physical cell identity: PCI, Cell ID, etc.) and an uplink reference signal for identifying the base station device 10 according to the instruction of the control unit 204. Based on the bandwidth, cyclic shift, parameter values for DMRS sequence generation, frequency allocation, etc., a sequence obtained by a predetermined rule (expression) is generated.

The uplink control signal generation unit 2066 encodes UCI, performs BPSK / QPSK modulation according to the instruction of the control unit 204, and generates a modulation symbol for PUCCH.

When the upper layer parameter (frequencyHopping) related to the frequency hopping of Rel-15 is set, mode 1 or mode 2 can be set as the value. Mode 2 is inter-slot hopping, and is a mode in which the frequency is changed for each slot when transmission is performed using a plurality of slots. On the other hand, mode 1 is in-slot hopping, and when transmitting using one or a plurality of slots, the slot is divided into a first half and a second half, and the frequency is changed between the first half and the second half for transmission. As for the frequency allocation in frequency hopping, the frequency domain radio resource allocation notified by DCI or RRC is applied to the first hop, and the frequency allocation of the second hop is applied to the radio resource used in the first hop. , Allocate radio resources shifted by the value set by the upper layer parameter (frequencyHoppingOffset) related to the frequency hopping amount.

The multiplexing unit 2068 performs PUSCH according to the 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.). The modulation symbol for PUCCH, the modulation symbol for PUCCH, and the uplink reference signal are multiplexed for each transmitting antenna port (DMRS port) (that is, each signal is mapped to a resource element).

Here, CS (configured scheduling) will be described. There are two types of transmission without dynamic grants. One is a configured grant type 1 given by RRC and stored as a configured grant, and one is a configured grant given by PDCCH and stored as a configured grant based on L1 signaling indicating activated or deactivated. It is a configured grant type 2 that is cleared. Type 1 and type 2 are set by RRC for each serving cell and each BWP. Multiple settings can only be active at the same time in different serving cells. For Type 2, activation and deactivation are independent between serving cells. For the same serving cell, the MAC entity is set to either type 1 or type 2. When type 1 is set, the RRC sets the following parameters.
-Cs-RNTI: CS-RNTI for resending
-Periodicity: configured grant type 1 period-timeDomainOffset: resource offset for SFN = 0 in the time domain-timeDomainAllocation: placement of configured grants in the time domain, including the parameter startSymbolAndLength-nrofHARQ-Processes: number of HARQ processes and type 2 When is set, the RRC sets the following parameters.
-Cs-RNTI: CS-RNTI for activation, deactivation and resending
-Periodicity: configured grant type 2 period-nrofHARQ-Processes: The number of HARQ processes, or Configured GrantConfig, is used to configure uplink transmission without dynamic grants according to two methods. The actual uplink grant is set via RRC for Configured Grant type 1 and is given via PDCCH processed by CS-RNTI for Configured Grant type 2.

The parameter repK set in the upper layer defines the number of iterations applied to the transmitted transport block. repK-RV indicates the redundancy version pattern that is applied repeatedly. With respect to the nth transmission opportunity during the K-time repetition, the transmission associated with the (mod (n-1, 4) + 1) th value in the set RV series (redundancy version pattern) is performed. Further, the first transmission of one transport block is started at the first transmission opportunity of K repetition when the set RV series is {0, 2, 3, 1}. When the set RV sequence is {0, 3, 0, 3}, it is started at any transmission opportunity of K repetitions associated with RV = 0. When the set RV series is {0, 0, 0, 0}, it is started at any transmission opportunity of K repetition except for the last transmission opportunity when K = 8. For any RV sequence, the iteration received the last transmission opportunity after K iterations, or during the K iterations in period P, or an uplink grant to schedule the same transport block in period P. It is terminated when the first time is reached. In Rel-15, the terminal device does not expect to set a time period for K repetitive transmissions longer than the time period calculated by the period P. For both Type 1 and Type 2 PUSCH transmissions by the Comfid Grant, when the terminal is set to repK> 1, the terminal repeats its transport block across consecutive slots in repK. At this time, the terminal device applies the same symbol arrangement in each slot. If the terminal device procedure for determining the slot configuration determines (determines) the symbol of the placed slot as a downlink symbol, transmission in that slot is omitted for PUSCH transmission in multiple slots. When repK is set, any one of 1, 2, 4, and 8 can be set as the value. However, if the RRC parameter itself does not exist, the number of repetitions is set to 1 for transmission. Further, repK-RV can be set to any one of {0, 2, 3, 1}, {0, 3, 0, 3}, {0, 0, 0, 0}. Note that the signals of different redundancy versions generated from the same transport block are signals composed of the same transport block (information bit series), but at least a part of the configured coding bits is different. In NR release 16, slot-to-slot repeats are named PUSCH repeat type B. In the Release 16 specification, for PUSCH repeat type B, after determining invalid symbols for each of the K nominal repeats, the remaining symbols are considered as potential valid symbols for PUSCH repeat type B. If the number of potential valid symbols for PUSCH repeat type B is greater than 0 for a nominal repeat, then that nominal repeat constitutes one or more actual repeats. Here, each actual iteration constitutes a set of consecutive potential valid symbols that can be used for PUSCH iteration type B within one slot. The actual repetition consisting of one symbol is omitted except when the symbol length L is 1. The actual iteration is omitted according to certain conditions. The redundancy version applied to the nth actual iteration (by count including the omitted actual iterations) is determined according to the table in the specification.

If DMRS sharing (DMRS bundling) considered in 3GPP is applied, DMRS can be shared between the above slots, but if DMRS sharing is applied to all transmission slots, the terminal transmits. There is a problem that the phase of the signal cannot be changed. Therefore, the solution to the above problem is shown below. When the setting related to DMRS sharing is transmitted by RRC signaling or signaling by DCI and the setting related to DMRS sharing is made in the terminal, the information about the time domain slot of DMRS is separately transmitted to the terminal device by signaling by RRC signaling or DCI. You will be notified. The terminal device performs transmission so that DMRS sharing can be applied by the base station device, which is a receiver, between the number of slots determined by the information about the time domain slot from the slot of the first transmission. In other words, the transmission is performed so that it can be regarded as a QCL (Quasi-Colocation). That is, transmission is performed so that the amplitude and phase of the propagation path do not change between the slots (so that they do not become discontinuous). FIG. 4 is a diagram illustrating a case where the number of repeated transmissions is 4, and 2 slots are set as a DMRS sharing period by higher layer signaling such as RRC. In the case of the figure, it is shown that the transmitting device performs the transmission with DMRS sharing in the first and second slots, and the transmitting device also performs the transmission with DMRS sharing in the third and fourth slots. In this case, the second slot and the third slot are continuous slots, but DMRS sharing cannot be applied. In addition, when the four-time repeat transmission is applied, even when the terminal device performs a total of three repeated transmissions from the second time to the four-time repeat transmission without performing the first transmission, the actual transmission is performed. The slot that satisfies the QCL is determined based on the repetition number specified by the base station, not the transmission. However, if separately specified by the control information, the count may be started from the actual transmission. Further, the slots specified by the information about the time domain slots are not continuous, and the non-continuous slots may be transmitted so as to be QCL. It should be noted that whether or not transmission from a time other than the first assigned repetition may be enabled or disabled may be set by RRC signaling.

In NR, in-slot frequency hopping / inter-slot frequency hopping / inter-slot frequency hopping are specified, but when DMRS sharing is applied even to hopping frequencies, transmission characteristics generally deteriorate significantly in a frequency selective fading environment. .. Therefore, when the hopping is applied by RRC signaling or the like, even if the offset amount of hopping is 0, DMRS sharing may not be applied regardless of the setting of RRC signaling related to DMRS sharing. It should be noted that DMRS sharing may be applied at each hop frequency instead of not being completely applied. That is, for example, in FIG. 5 in which inter-slot hopping is applied and an example of repeated transmission between slots is shown, DMRS shares are used for the first slot and the third slot, and the second slot and the fourth slot, respectively, which use the same frequency. A ring may be applied. The

In the above, the explanation is made assuming repetition between slots, but the explanation is not limited to repetition between slots, and may be applied to repetition within slots. In this case, the setting related to DMRS sharing by RRC signaling or signaling by DCI is based on the repeating unit, that is, the number of repetitions in the slot, not the slot. Further, the QCL is limited to one slot of the repetition in the slot, and the repetition outside the slot may not be regarded as the QCL.

If DMRS sharing is possible, channel compensation can be performed using DMRS included in other slots, so it is not always necessary to insert DMRS into the slot. When DMRS is not inserted, many information bits or parity bits can be transmitted, so that the communication error rate can be reduced, which can lead to quality improvement or coverage improvement. For example, when the setting related to the reduction of DMRS is made by the control information such as RRC signaling, DMRS is inserted only in the first repetition and DMRS is not inserted in the second and subsequent repetitions, so that many information bits are used. , Or the parity bit can be transmitted. However, if the transmission is started from the second time among the repetitions specified by the base station device, the DMRS will not be transmitted. The DMRS is arranged only in the slot (repetition) where the RV is 0, and the DMRS is not arranged only in the slot (repetition) where the RV is other than 0. The above will be described with reference to FIG. The upper part of FIG. 6 shows the case where the RV pattern in repeated transmission is {0, 0, 0, 0}. The figure shows a 4-slot repeat, where the DMRS symbols in the slots are shaded and the data OFDM symbols are dotted. When the RV pattern is {0, 0, 0, 0}, DMRS is transmitted in all slots. Next, when the RV pattern is {0, 3, 0, 3}, DMRS is transmitted in the first and third slots, and DMRS is not included in the second and fourth slots. When the RV pattern is {0, 2, 3, 1}, DMRS is transmitted only in the first slot, and DMRS is not included in the second, third, and fourth slots. That is, in NR, it is not specified that the transmission is repeatedly started from the slot (repetition) where the RV is other than 0, so that the transmission is always started from the slot where the RV = 0. This makes it possible to avoid performing only transmission that does not include DMRS. Here, although the DMRS is not included in the slots other than 0 in the RV, the configuration may be reduced instead of completely not including the DMRS. For example, only the front loaded DMRS may be transmitted, and all or part of the additional DMRS set by the RRC may be reduced. Information on the reduction criteria may be communicated by RRC signaling. However, if the above transmission is performed when the intra-slot frequency hopping / inter-slot frequency hopping / inter-slot frequency hopping is applied, there is a problem that DMRS is not transmitted in the offset hop. Therefore, if any of the above frequency hopping is applied, DMRS sharing can be set by RRC, and even if DMRS sharing is enabled, DMRS is repeatedly transmitted (slot). May be. Regarding DMRS reduction, information about the DMRS time domain slot is notified by RRC signaling or DCI signaling, applied to each set slot (repetition), and DMRS is transmitted outside the set slot. May be good.

The wireless transmission unit 2070 performs an IFFT (Inverse Fast Fourier Transform) on the multiplexed signal to generate an OFDM symbol. The radio transmission unit 2070 adds a CP to the OFDM symbol to generate a baseband digital signal. Further, the radio transmission unit 2070 converts the baseband digital signal into an analog signal, removes an excess frequency component, converts it into a carrier frequency by up-conversion, amplifies the power, and makes a base station via the transmission antenna 208. It is transmitted to the device 10.

The receiving unit 212 includes a radio receiving unit (radio receiving step) 2120, a multiple separation unit (multiple separation step) 2122, a propagation path estimation unit (propagation path estimation step) 2144, an equalization unit (equalization step) 2126, and a demodulation unit (demodulation unit). It includes a demodulation step) 2128 and a decoding unit (decoding step) 2130.

The radio reception unit 2120 converts the downlink signal received via the reception antenna 210 into a baseband signal by down-conversion, removes unnecessary frequency components, and sets the amplification level so that the signal level is properly maintained. Based on the in-phase component and the quadrature component of the controlled and received signal, quadrature demodulation is performed and the quadrature demodulated analog signal is converted into a digital signal. The radio receiving unit 2120 removes a portion corresponding to the CP from the converted digital signal, performs FFT on the signal from which the CP has been removed, and extracts a signal in the frequency domain.

The multiplex separation unit 2122 separates the extracted frequency domain signal into a downlink reference signal, PDCCH, PDSCH, and PBCH. The propagation path estimation unit 2124 estimates the frequency response (or delay profile) using a downlink reference signal (DM-RS, etc.). The frequency response result estimated for the propagation path for demodulation is input to the equalization unit 1126. The propagation path estimation unit 2124 uses a downlink reference signal (CSI-RS, etc.) to measure the uplink channel status (RSRP (Reference Signal Received Power), RSRQ (Reference Signal Received Quality), RSSI (Received Signal Strength). Indicator), SINR (Signal to Interference plus Noise power Ratio) measurement). The measurement of the downlink channel status is used for determining the MCS for the PUSCH and the like. The measurement result of the downlink channel status is used for determining the CQI index and the like.

The equalization unit 2126 generates an equalization weight based on the MMSE norm from the frequency response input from the propagation path estimation unit 2124. The equalization unit 2126 multiplies the input signal (PUCCH, PDSCH, PBCH, etc.) from the multiplex separation unit 2122 by the equalization weight. The demodulation unit 2128 performs demodulation processing based on predetermined modulation order information instructed by the control unit 204.

The decoding unit 2130 performs decoding processing on the output signal of the demodulation unit 2128 based on the information of the coding rate specified in advance from the coding rate / control unit 204. The decoding unit 2130 inputs the decrypted data (DL-SCH or the like) to the upper layer processing unit 202. (Second embodiment)

In the first embodiment, DMRS sharing was premised, and the criteria for DMRS sharing and the reduction of DMRS were explained. In the second embodiment, a method of reducing the error rate in repeated transmission without assuming DMRS sharing will be described.

In the figured grant scheduling type 2, RRC signaling is used to set the allocation cycle and the number of repetitions, and PDCCH (DCI) is used to notify the setting of the remaining transmission parameters (MCS and resource blocks used), and the figured grant is used. Activate scheduling type 2. After that, in general, transmission is performed with the same settings for a while. For deactivation of the figured grant scheduling type 2, a predetermined parameter of PDCCH (DCI) is set to a predetermined value and notified to the terminal device.

As mentioned above, in Configure Grant Scheduling Type 2, the parameters set in PDCCH will continue to be used for a certain period of time. If the situation changes significantly, the parameters can be changed by reactivating by sending the PDCCH again. However, after the change, the transmission parameters set by the PDCCH will continue to be used for a certain period of time. In particular, the optimum value for information on precoating (beamforming) when a terminal has multiple antenna ports is likely to change, so if there is a time difference between PDCCH transmission and actual data transmission, set the optimum value. Difficult to do.

Therefore, in the repeated transmission in the figured grant scheduling, it is conceivable to apply different precoding for each repetition. That is, when the confidged grant scheduling type 2 is set by RRC and DCI, and the setting related to precoding cycling is applied separately by RRC signaling, the specified precoding index is used for the first transmission, and the second and subsequent times. For the repetition of, different precoding is applied according to the preset precoding pattern. However, one precoding pattern may be specified, or the base station may specify from a plurality of patterns by control information. Further, when set by RRC, the precoding determined by the terminal device may be used instead of the notified precoding. At this time, the same precoding may be restricted to be applied.
(Third embodiment)

The spatial multiplex in NR is a maximum of 8 in the case of DMRS configuration 1 and a maximum of 12 in the case of DMRS configuration 2. This is because DMRS (front loaded DMRS) can only be placed on consecutive 2 OFDM symbols. Up to NR Rel-16, if DMRS is assigned to three or more consecutive OFDM symbols, there is a problem that the OFDM symbols (resource elements) that can be used for data transmission are limited and the transmission rate drops.

If DMRS sharing can be applied with NR Rel-17, even if the ratio of DMRS increases in one repeated transmission, if DMRS can be reduced in the second and subsequent repetitions, the ratio of DMRS will not increase as a whole. Spatial multiplexing can be increased.

To realize the above, for example, even when the RRC parameter (1 or 2) for setting the number of front loaded DMRS up to Rel 16 is set, the RRC parameter (integer of 3 or more) for Rel-17 is set. If is set, DMRS is arranged by the RRC parameter (integer of 3 or more) for Rel-17. However, not limited to this, for example, the true number of DMRS is determined by multiplying the number of front loaded DMRS in the RRC parameter of Rel-16 by the number set in the RRC parameter set in Rel-17. May be. If in-slot frequency hopping or in-slot repetition (transmission) is applied, there may be a separate restriction. This is because when the above technique is applied, the number of consecutive allocated OFDM symbols becomes small, so the insertion loss of DMRS becomes too large, and it becomes impossible to arrange all the DMRS symbols set in the allocation in the first place. be.

The program that operates in the apparatus according to one aspect of the present invention is a program that controls a Central Processing Unit (CPU) or the like to operate a computer so as to realize the functions of the above-described embodiment related to one aspect of the present invention. There may be. The program or the information handled by the program is temporarily read into volatile memory such as Random Access Memory (RAM) at the time of processing, or stored in non-volatile memory such as flash memory or Hard Disk Drive (HDD), and is required. The CPU reads, corrects, and writes accordingly.

It should be noted that a part of the apparatus in the above-described embodiment may be realized by a computer. In that case, the program for realizing the function of the embodiment may be recorded on a computer-readable recording medium. It may be realized by having a computer system read a program recorded on this recording medium and executing the program. The term "computer system" as used herein is a computer system built into a device and includes hardware such as an operating system and peripheral devices. Further, the "computer-readable recording medium" may be any of a semiconductor recording medium, an optical recording medium, a magnetic recording medium, and the like.

Furthermore, a "computer-readable recording medium" is a medium that dynamically holds a program for a short period of time, such as a communication line when a program is transmitted via a network such as the Internet or a communication line such as a telephone line. In that case, a program that holds a program for a certain period of time, such as a volatile memory inside a computer system that is a server or a client, may be included. Further, the above-mentioned program may be for realizing a part of the above-mentioned functions, and may be further realized for realizing the above-mentioned functions in combination with a program already recorded in the computer system.

Further, each functional block or feature of the device used in the above-described embodiment can be implemented or executed in an electric circuit, that is, typically an integrated circuit or a plurality of integrated circuits. Electrical circuits designed to perform the functions described herein are general purpose processors, digital signal processors (DSPs), application specific integrated circuits (ASICs), field programmable gate arrays (FPGAs), or others. Programmable Logic Devices, Discrete Gate or Transistor Logic, Discrete Hardware Components, or Combinations thereof. The general purpose processor may be a microprocessor, a conventional processor, a controller, a microcontroller, or a state machine. The electric circuit described above may be composed of a digital circuit or an analog circuit. In addition, when an integrated circuit technology that replaces the current integrated circuit appears due to advances in semiconductor technology, it is also possible to use an integrated circuit based on this technology.

The invention of the present application is not limited to the above-described embodiment. In the embodiment, an example of the device has been described, but the present invention is not limited to this, and the present invention is not limited to this, and is a stationary or non-movable electronic device installed indoors or outdoors, for example, an AV device, a kitchen device, and the like. It can be applied to terminal devices or communication devices such as cleaning / washing equipment, air conditioning equipment, office equipment, vending machines, and other living equipment.

As described above, the embodiment of the present invention has been described in detail with reference to the drawings, but the specific configuration is not limited to this embodiment, and design changes and the like within a range not deviating from the gist of the present invention are also included. Further, one aspect of the present invention can be variously modified within the scope of the claims, and the technical embodiment of the present invention can also be obtained by appropriately combining the technical means disclosed in the different embodiments. Included in the range. Further, the elements described in each of the above-described embodiments are included, and a configuration in which elements having the same effect are replaced with each other is also included.

One aspect of the present invention is suitable for use in a base station device, a terminal device, and a communication method.

10 Base station device 20 Terminal device 10a Range in which the base station device 10 can be connected to the terminal device 102 Upper layer processing unit 104 Control unit 106 Transmission unit 108 Transmission antenna 110 Reception antenna 112 Reception unit 1060 Coding unit 1062 Modulation unit 1064 Downlink Control signal generation unit 1066 Downlink reference signal generation unit 1068 Multiplexing unit 1070 Wireless transmission unit 1120 Wireless reception unit 1122 Propagation path estimation unit 1124 Multiplexing separation unit 1126 Equalization unit 1128 Demodulation unit 1130 Decoding unit 202 Upper layer processing unit 204 Control unit 206 Transmitter 208 Transmitter Antenna 210 Receiving Antenna 212 Receiving Unit 2060 Coding Unit 2062 Modulation Unit 2064 Uplink Reference Signal Generation Unit 2066 Uplink Control Signal Generation Unit 2068 Multiplexing Unit 2070 Wireless Transmitting Unit 2120 Wireless Receiving Unit 2122 Multiplexing Separation Unit 2124 Propagation Path Estimating unit 2126 Equalizing unit 2128 Demodulation unit 2130 Decoding unit

Claims (6)

1. A terminal device that communicates with a base station device by repeated transmission, and includes an upper layer processing unit that sets the number of repetitions in the repeated transmission and a redundancy version in the repeated transmission, and a slot configuration unit that constitutes a slot. The unit is a terminal device that changes the number of reference signals in each repeated transmission based on the redundancy version in the repeated transmission.
2. The terminal according to claim 1, wherein the slot component includes a smaller number of reference signals than the reference signal in the repeated transmission in which the redundancy version is set to 0 in the repeated transmission in which the value other than 0 is set. Device.
3. The terminal device according to claim 1, wherein the slot component transmits a reference signal only in repeated transmission in which 0 is set as the redundancy version.
4. A base station device that communicates with a terminal device by repeated transmission, and includes an upper layer processing unit that sets the number of repetitions in the repeated transmission and a redundancy version in the repeated transmission, and a slot configuration unit that constitutes a slot. The unit is a base station device that changes the number of reference signals in each repeated transmission based on the redundancy version in the repeated transmission.
5. The base according to claim 4, wherein the slot component includes a smaller number of reference signals than the reference signal in the repeated transmission in which the redundancy version is set to 0 in the repeated transmission in which the value other than 0 is set as the redundancy version. Station equipment.
6. The base station device according to claim 4, wherein the slot component transmits a reference signal only in repeated transmission in which 0 is set as the redundancy version.

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