WO2022080391A1 - Terminal device, and base station device - Google Patents

Abstract

This terminal device is provided with a transmission unit which uses multiple slots to transmit one transport block by means of one control information signaling, a slot configuring unit which arranges one or more DMRS symbols for the slots, and an upper layer processing unit which processes RRC signaling which includes at least information relating to the DMRS symbols, information relating to repeat transmissions, and information relating to transport blocks, wherein, if the information relating to one transport block has been set to a prescribed value, then the slot configuring unit transmits the one transport block for multiple OFDM symbols in the multiple slots indicated by the aforementioned information relating to repeat transmissions.

Description

Terminal equipment and base station equipment

The present invention relates to a terminal device and a base station device. This application claims priority based on Japanese Patent Application No. 2020-174912 filed in Japan on October 16, 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.

According to the specifications of Rel-16, when the repeating unit straddles the boundary of the slot or the section where transmission is not possible, DMRS is arranged before and after that. This is because the DMRS that can be used for channel estimation is limited to the repeating unit or the slot.

Channel estimation accuracy can be significantly improved by using DMRS contained in different repeating units or different slots. 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)

Repeated transmission can achieve low transmission delay because decoding can be performed at an early stage, but the quality may deteriorate compared to batch encoding because the transmitted parity bits are biased. be. In other words, in transmission where low delay is not a problem, there is a possibility that transmission quality can be obtained by batch encoding transmission rather than repeated transmission. Therefore, in Release 17, it is considered to perform batch encoding with resources secured over a plurality of slots. (Non-Patent Document 2)

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 techniques 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 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, for a transmission unit that performs transmission using a plurality of slots by one control information signaling, and for the plurality of slots. The transmission unit includes a transmission unit in which at least one DMRS symbol is arranged, an upper layer processing unit that processes RRC signaling including at least information on the DMRS symbol, information on the number of repeated transmissions, and information on a transport block, and the transmission unit. Transmits one transport block using the plurality of OFDM symbols in the plurality of slots specified by the information regarding the number of repeated transmissions when the information regarding the transport block is set to a predetermined value. , If the information about the transport block is set to a value other than the predetermined value, the same transport block is performed multiple times using the plurality of OFDM symbols in the plurality of slots specified by the information regarding the repeated transmission. Send.
(2) In one aspect of the present invention, the transmission unit arranges the DMRS symbol according to the information regarding the number of consecutive OFDM symbols separately included in the RRC signaling.
(3) In one aspect of the present invention, the transmission unit and the slot configuration unit arrange the DMRS symbol with reference to the head of the slot.
(4) In one aspect of the present invention, the transmission unit arranges a DMRS symbol with reference to the head of the plurality of consecutive OFDM symbols.
(5) One aspect of the present invention is a base station device that communicates with a terminal device, which receives signals transmitted using a plurality of slots by one control information signaling, and at least in the plurality of slots. The receiving unit includes a receiving unit that receives one or more DMRS symbols, and an upper layer processing unit that processes RRC signaling that includes at least information about the DMRS symbol, information about the number of repeated transmissions, and information about a transport block. , When the information about the transport block is set to a predetermined value, one transport block transmitted using the plurality of OFDM symbols in the plurality of slots specified by the information about the repeat transmission is received. If the information about the transport block is set to a value other than the predetermined value, the same transport transmitted multiple times using the plurality of OFDM symbols in the plurality of slots specified by the information regarding the repeated transmission. Receive the block.
(6) In one aspect of the present invention, the receiving unit receives the arranged DMRS symbol based on the information regarding the number of consecutive OFDM symbols separately included in the RRC signaling.
(7) In one aspect of the present invention, the receiving unit receives the DMRS symbol arranged with the head of the slot as a reference.
(8) In one aspect of the present invention, the receiving unit receives DMRS symbols arranged with reference to the heads of the plurality of consecutive OFDM symbols.
(9) One aspect of the present invention is a terminal device that communicates with a base station device, and is a time domain resource assignment and a frequency domain resource assignment used for the communication by upper layer signaling and / or downlink control information. The control unit is provided with a control unit for acquiring the above, and when a number of resource elements smaller than 12 resource elements is specified as the frequency domain resource assignment, the control unit has a first configuration and a second configuration as a DMRS configuration. Of these, the first configuration is used.

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 the allocated resource which concerns on this embodiment. It is a figure explaining an example of the DMRS arrangement which concerns on this embodiment. It is a figure explaining an example of the DMRS arrangement which concerns on this embodiment. It is a figure explaining an example of the DMRS arrangement which concerns on this embodiment. It is a figure explaining an example of the DMRS arrangement which concerns on this embodiment. It is a figure explaining an example of the DMRS arrangement which concerns on this embodiment. It is a figure explaining an example of frequency hopping which concerns on this embodiment. It is a figure explaining an example of the transport block transmission which concerns on this embodiment. It is a figure explaining an example of frequency hopping 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 precursor is applied, that is, DFT is applied when upper layer parameters related to Transform precursor are set in the uplink. ) Etc. are used. 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 acknowledgment: 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 a 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. For downlink assignment, frequency domain resource allocation for PDSCH, time domain resource allocation (assignment, placement), MCS (Modulation and Coding Scheme) for PDSCH, and NDI (New Data Indicator) that instructs initial transmission or retransmission. ), Information indicating the HARQ process number in the downlink, and downlink control information such as Redundancy version indicating the amount of redundancy added to the code word at the time of error correction coding. The code word is the 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 (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 the purpose of 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, among the above information, information (fields) necessary for the intended use.

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 collectively 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 wireless 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 above the physical layer such as the layer. 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 wireless transmission unit 1070 converts the digital signal into an analog signal, removes an excess frequency component by filtering, up-converts 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 radio link control (RLC) layer, and the radio 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 slot-to-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 the first half and the 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) regarding the amount of frequency hopping.

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 given by PDCCH and stored as a configured grant based on L1 signaling indicating a configured grant activation or deactivation. 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 applied to the iteration. 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 a time period for K repetitive transmissions to be set longer than the time period calculated by the period P. For both Type 1 and Type 2 PUSCH transmissions by the figured grant, when the terminal is set to repK> 1, the terminal repeatedly transmits its transport block over the contiguous slots of 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 of 1, 2, 4, and 8 times 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}. 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, in addition to inter-slot repetition, intra-slot repetition was specified. For in-slot repeats, resources are specified by the repeat unit and the number of repeats. Here, when the repeating unit straddles the boundary between slots, or when it straddles an OFDM symbol (SSB (synchronous signal), CORESET (downlink control information), invalid symbol, etc.) that cannot be transmitted, as shown in FIG. , The transmission is done by actual iterations rather than nominal iterations. Further, in the slot configuration unit, DMRS is inserted for each actual repetition, and when the actual repetition is composed of one OFDM symbol, the specification is such that transmission is not performed.

In NR release 16, the slot-to-slot repeat is 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), which is being studied in 3GPP, is applied as a technique for NR release 17, DMRS can be shared between the above repetitions / slots. As a result, it is not necessary to insert the DMRS every time it is repeated as in the release 16, and the transmission efficiency can be improved. Here, no study has been made on how much DMRS should be reduced. In this embodiment, the DMRS insertion (arrangement) interval will be described.

In NR, it is normal to use 14 OFDM symbols as one slot and allocate resources in slot units. Therefore, when more OFDM symbols are assigned than 14 OFDM due to repeated transmission, as shown in FIG. 5, the assigned OFDM symbols are divided into 14 OFDM symbols, and one or two or more DMRSs (symbols) are divided into 14 OFDM symbols. ), The arrangement of DMRS introduced from Release 15 can be diverted. The unit is not limited to the 14 OFDM symbol, and may be notified by higher layer signaling or DCI. As an initial value, it may be included in MIB or SIB.

Instead of arranging DMRS for each OFDM symbol determined as described above, it is conceivable to arrange DMRS with reference to the beginning of the slot as shown in FIG. 6 without depending on repeated transmission. A DMRS may be placed at the beginning of transmission. In FIG. 6, the nominal iteration is divided into two actual iterations at the slot boundary, but if the RRC signaling is set to a predetermined value, the transmission may be repeated without division.

As shown in FIG. 7, DMRS may be arranged with reference to the beginning of the OFDM symbols transmitted continuously regardless of the slot boundary. If the transmission continues for 15 OFDM symbols or more, the DMRS may be divided into 14 OFDM symbols and DMRS may be arranged in each divided unit. Alternatively, as shown in FIG. 8, the DMRS may be arranged with reference to the beginning of consecutive OFDM symbols and the slot boundary.

In release 17, wireless resources are secured over multiple slots by repeated transmission, and batch-encoded transmission is performed for the secured resources instead of repeated transmission, that is, the transmitter transmits one transport block. Is being considered. Whether to transmit one transport block or to use a plurality of transport blocks may be determined by the information about the transport block included in the RRC signaling. That is, when the information about the transport block is a predetermined value, one transport block is transmitted in the radio resource of the reserved multiple slots, and when the information about the transport block is other than the predetermined value, the reserved multiple slots are transmitted. Repeated transmission (multiple transmission of the same transport block) in the radio resource of. When transmitting one transport block in the reserved radio resource of a plurality of slots, the reserved number of slots may use the information regarding the number of repeated transmissions, or the number of slots is determined by a parameter set separately. May be good. The information about the transport block may be set as one of the possible values for the information about the number of repeated transmissions. Also, the allocation of radio resources may be performed by the information (DCI or RRC signaling) regarding the repeated transmission between slots and / or the repeated transmission within the slots specified by Release 16. In the repeated transmission, a CRC bit is added for each repetition, but in the case of batch coding, the transmission is performed by the same resource allocation as in the repeated transmission, but the CRC bit can be transmitted only once. That is, the bit sequences to be transmitted are significantly different. Nevertheless, as shown in FIG. 9, it is possible to make the arrangement of DMRS the same as that of Release 16. That is, the DMRS may be arranged with reference to the beginning of the actual repeated transmission. In this case, since the DMRS configuration can be the same as that of the transmission in which the transmission is repeatedly performed as in the release 16, the DMRS transmitted by the terminal corresponding to the release 16 and the terminal corresponding to the release 17 can be orthogonal to each other. If the DMRS can be orthogonalized, it is possible to perform transmission in which terminals corresponding to release 16 and terminals corresponding to release 17 are spatially multiplexed.

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 a transmission antenna 208. It is transmitted to the device 10.

The receiving unit 212 includes a wireless 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, a case where batch-encoded transmission is performed using resources allocated by the resource allocation method in repeated transmission has been described. In the present embodiment, a method of transmitting the resources allocated by one control information by dividing them to some extent instead of collectively will be described.

First, it is conceivable to encode in continuous OFDM symbol units in the actual resources allocated by resource allocation. In the figure, the DMRS is arranged at the beginning of consecutive OFDM symbols, but the present invention is not limited to this, and any of the DMRS arrangement methods described in the first embodiment can be applied. By closing the coding for each consecutive OFDM symbol, that is, by transmitting the CRC bit in units of consecutive OFDM symbols, the decoding is performed for each CRC reception instead of waiting for the reception of all the allocated resources before decoding. Can be done. Consecutive OFDM symbol units may encode the same information bits and have different (or identical) RVs set. That is, transport block iterations may be applied. Alternatively, a bit sequence in which different information bits are encoded may be transmitted. The bitstream to be transmitted may be determined by the setting of RRC signaling. Alternatively, it may be determined by a field contained in DCI (eg, a field relating to RV) and / or RRC signaling.

In the case of encoding in continuous OFDM symbol units, if a predetermined value is set in the RRC signaling related to frequency hopping, hop may be performed in continuous OFDM symbol units as shown in FIG. In this case, a CRC bit is transmitted at each hop. The criteria for the number of OFDM symbols included in the same hop may be specified by actual repetition or by nominal repetition.

The range to which the CRC bit is added is not limited to consecutive OFDM symbol units, and may be determined based on the actual number of repetitions in release 16. FIG. 11 shows a case where a CRC bit is added every 2 repetitions. FIG. 11 shows a case where the reference repetition number unit is 2, but the reference repetition number unit is notified by higher layer signaling or DCI. The initial value may be included in the MIB or SIB.

In the case of encoding in continuous OFDM symbol units, when a predetermined value is set by RRC signaling of frequency hopping, as shown in FIG. 12, for each resource corresponding to the specified actual number of repetitions. You may hop the frequency. In this case, a CRC bit is transmitted at each hop.

(Third embodiment)
In the first and second embodiments, the time domain resource allocation has been described. In the third embodiment, the frequency domain resource allocation will be described. In the specifications up to NR release 16, 12 subcarriers (resource elements) constitute 1RB (1PRB). When the number of transmission bits is small or the power is insufficient, it is necessary to perform transmission with a number of subcarriers smaller than 12 subcarriers. The same resource is used for data transmission and DMRS transmission, but no specification is made for cases where the number is less than 12 subcarriers. For example, 12 subcarriers are divided into 6 subcarriers in the first half and the latter half, and the first half or the second half is specified by RRC signaling or DCI to specify the number of subcarriers smaller than the 12 subcarriers. At this time, since the DMRS configuration type 1 is transmitted by even-numbered or odd-numbered subcarriers, there is no problem because DMRS is included in the 6 subcarriers. There is no problem with DMRS configuration type 2 because DMRS is included in 6 subcarriers. Next, consider a case where the 12 subcarriers are divided into four and transmission is performed using the three subcarriers. In this case, in the DMRS configuration type 1, the DMRS is always included in the transmission of the three subcarriers, although it differs depending on whether the DMRS is an even number or an odd number and becomes one subcarrier or two subcarriers. On the other hand, in the DMRS configuration type 2, DMRS may not be included in the 3 subcarriers depending on which of the 3 patterns is specified for the transmission of the 3 subcarriers. Therefore, when transmitting with less than 12 subcarriers, the terminal device expects that the DMRS configuration type 1 is used for the transmission of the PUSCH and the reception of the PDSCH. However, it may not be expected that the transmission will be performed by the DMRS configuration type 2. In the case of 6 subcarriers, as described above, there is no problem with either DMRS configuration type 1 or DMRS configuration type 2, so this may be applied to cases where the number is less than 6 subcarriers instead of 12 subcarriers.

(Fourth Embodiment)
In the specifications up to Release 16, when frequency hopping is performed, the RB specified by the frequency domain resource allocation (FDRA) allocated by DCI or RRC signaling and the RB given the offset set by RRC signaling to FDRA are used. I was doing frequency hopping. That is, only 2 hops were specified. On the other hand, when the channel state information (CSI) is on the transmitting side, the more hops there are, the more characteristics there are. However, if RRC signaling for notifying a plurality of offsets is used, the overhead due to control information becomes large. Therefore, when frequency hopping by 4 hops is performed, control information can be reduced by determining the hopping pattern in advance. For example, when the second hop is shifted by the RB _offset with respect to the first hop, the offset amount of the third hop is RB _offset / 2, and the offset amount of the fourth hop is 3 × RB _offset /. Let it be 2. Here, the ceiling function or the floor function may be applied so that the offset amount is an integer. This embodiment can be combined with a second embodiment to which frequency hopping is applied.

The program that operates on the apparatus according to the present invention may be a program that controls the Central Processing Unit (CPU) or the like to operate the computer so as to realize the functions of the above-described embodiment according to the present invention. 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 the stationary or non-movable electronic device installed indoors and 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, the present invention can be variously modified within the scope of the claims, and the technical scope of the present invention also includes embodiments obtained by appropriately combining the technical means disclosed in the different embodiments. Will be. 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.

The present invention is suitable for use in base station devices, terminal devices and communication methods.

Claims (9)

1. A terminal device that communicates with a base station device.
   A transmitter that transmits using a plurality of slots by one control information signaling,
   A transmission unit that arranges at least one DMRS symbol for the plurality of slots, and an upper layer process that processes RRC signaling including at least information about the DMRS symbol, information about the number of repeated transmissions, and information about a transport block. Equipped with a part
   The transmitter is
   When the information about the transport block is set to a predetermined value, one transport block is transmitted using the plurality of OFDM symbols in the plurality of slots specified by the information regarding the number of repeated transmissions.
   When the information about the transport block is set to a value other than the predetermined value, the same transport block is transmitted multiple times using the plurality of OFDM symbols in the plurality of slots specified by the information regarding the repeated transmission. Terminal device.
2. The terminal device according to claim 1, wherein the transmission unit arranges the DMRS symbol according to information regarding the number of consecutive OFDM symbols separately included in the RRC signaling.
3. The terminal device according to claim 1, wherein the transmission unit arranges the DMRS symbol with respect to the head of the slot.
4. The terminal device according to claim 1, wherein the transmission unit arranges DMRS symbols with reference to the heads of the plurality of consecutive OFDM symbols.
5. A base station device that communicates with a terminal device.
   A receiver that receives signals transmitted using a plurality of slots by one control information signaling and receives at least one DMRS symbol in the plurality of slots.
   An upper layer processing unit for processing RRC signaling, which includes at least information on the DMRS symbol, information on the number of repeated transmissions, and information on the transport block, is provided.
   The receiver is
   When the information about the transport block is set to a predetermined value, one transport block transmitted using the plurality of OFDM symbols in the plurality of slots specified by the information regarding the number of repeated transmissions is received. ,
   If the information about the transport block is set to a value other than the predetermined value, the same transport block transmitted multiple times using the plurality of OFDM symbols in the plurality of slots specified by the information regarding the repeated transmission. Base station equipment to receive.
6. The base station apparatus according to claim 5, wherein the receiving unit receives the arranged DMRS symbols based on the information regarding the number of consecutive OFDM symbols separately included in the RRC signaling.
7. The base station device according to claim 5, wherein the receiving unit receives the DMRS symbol arranged with the head of the slot as a reference.
8. The base station apparatus according to claim 5, wherein the receiving unit receives a DMRS symbol arranged with reference to the head of the plurality of consecutive OFDM symbols.
9. A terminal device that communicates with a base station device.
   A control unit for acquiring a time domain resource assignment and a frequency domain resource assignment used for the communication by upper layer signaling or / and downlink control information is provided.
   When a number of resource elements smaller than 12 resource elements is specified as the frequency domain resource assignment, the control unit sets the first configuration among the first configuration and the second configuration as the DMRS configuration. Terminal device to be used.

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