JP2023166647A - Terminal device and base station device - Google Patents

Abstract

To efficiently transmit a reference signal in repetitive transmission.SOLUTION: A terminal device for transmission to a base station device in repetitive transmission includes an upper layer processing part for setting nominal number of repetitions in the repetitive transmission and setting frequency hopping method to change transmission frequency in the repetitive transmission, and a transmission part for determining actual number of repetitions based on the nominal number of repetitions and performing transmission for the actual number of repetitions, the transmission part applies frequency hopping based on the number of repetitions applying DMRS bundling and the nominal number of repetitions.SELECTED DRAWING: Figure 6

Description

The present invention relates to a terminal device and a base station device.

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

Furthermore, 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 multiple slots. However, since multiple slots are required for repeated transmission, there is a problem in terms of delay. Therefore, in NR Release 16, repeated transmission within a slot was specified. In intra-slot repeat transmission, it is possible to set a repetition unit multiple times within a slot and perform transmission.

In the specifications up to Rel-16, DMRS that can be used for channel estimation was limited to within a repetition unit or slot, but channel estimation can be performed by using DMRS included in different repetition units or different slots. Accuracy can be significantly improved. Therefore, in NR Release 17, consideration is being given to DMRS bundling (DMRS sharing) that makes it possible to use DMRS included in different repetition units or different slots. (Non-patent document 1)

The NR specifications employ frequency hopping, which changes the frequency used for each repeated transmission. By changing the frequency, good characteristics can be obtained due to the frequency diversity effect even when the channel condition is unknown on the transmitting side. However, if the frequency is changed by inter-slot frequency hopping or the like, it is not possible to expect improvement in channel estimation accuracy using the above-mentioned DMRS bundling. Therefore, a method has been proposed in which frequency hopping is applied in units of multiple slots instead of changing the frequency in units of slots. (Non-Patent Document 2) This makes it possible to perform highly accurate channel estimation using DMRS bundling while applying frequency hopping.

Qualcomm, “Potential techniques for coverage enhancements,” 3GPP TSG-RAN WG1 Meeting #101, R1-2004499, May 2020. Intel, “Discussion on potential techniques for PUSCH coverage enhancement,” 3GPP TSG-RAN WG1 Meeting #102-e, R1-2005889, August 2020.

In Non-Patent Document 2, a method is proposed in which frequency hopping is applied to each plurality of slots and DMRS bundling is applied to the plurality of slots, thereby obtaining high channel estimation accuracy and also obtaining frequency diversity due to frequency hopping. However, in order to actually apply it, it is necessary to consider how to control it and what kind of control information to exchange.

The present invention has been made in view of these circumstances, and its purpose is to efficiently expand coverage by making it possible to effectively apply DMRS bundling.

The configurations of a base station device, a terminal device, and a communication method according to the present invention to solve the above-mentioned problems are as follows.

(1) One aspect of the present invention is a terminal device that performs transmission by repeated transmission to a base station device,
an upper layer processing unit that sets a nominal number of repetitions in the repeated transmission and a frequency hopping method for changing the transmission frequency in the repeated transmission; and an upper layer processing unit that determines the actual number of repetitions based on the nominal number of repetitions, and The transmitter includes a transmitter that performs transmission of an actual number of repetitions, and the transmitter applies frequency hopping based on the number of repetitions to which DMRS bundling is applied and the nominal number of repetitions.
(2) In one aspect of the present invention, the number of repetitions of applying the DMRS bundling is set by the upper layer processing unit.
(3) In one aspect of the present invention, the number of repetitions of applying the DMRS bundling is associated with a redundancy version series set by an upper layer processing unit.
(4) One aspect of the present invention is that the frequency hopping method is applied when the frequency hopping method indicates a predetermined method, and when the frequency hopping method indicates a method other than the predetermined method, the transmitter performs frequency hopping based on the nominal number of repetitions. apply.
(5) One aspect of the present invention is a base station device that repeatedly transmits data to a terminal device,
an upper layer processing unit that sets a nominal number of repetitions in the repeated transmission and a frequency hopping method for changing the transmission frequency in the repeated transmission; and an upper layer processing unit that determines the actual number of repetitions based on the nominal number of repetitions, and The transmitter includes a transmitter that performs transmission of an actual number of repetitions, and the transmitter applies frequency hopping based on the number of repetitions to which DMRS bundling is applied and the nominal number of repetitions.
(6) In one aspect of the present invention, the number of repetitions of applying the DMRS bundling is set by the upper layer processing unit.
(7) In one aspect of the present invention, the number of repetitions of applying the DMRS bundling is associated with a redundancy version series set by the upper layer processing unit.
(8) In one aspect of the present invention, the frequency hopping is applied when the frequency hopping method indicates a predetermined method, and when the frequency hopping method indicates a method other than the predetermined method, the transmitter Apply frequency hopping based on

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

1 is a diagram showing a configuration example of a communication system 1 according to the present embodiment. FIG. 1 is a diagram showing an example of the configuration of a base station device according to the present embodiment. 1 is a diagram illustrating a configuration example of a terminal device according to the present embodiment. FIG. 3 is a diagram showing an example of frequency hopping according to the first embodiment. FIG. 3 is a diagram illustrating an example of frequency hopping based on a nominal repetition index according to the first embodiment; FIG. 3 is a diagram illustrating an example of frequency hopping based on an actual repetition index according to the first embodiment. FIG. 3 is a diagram illustrating an example of frequency hopping based on invalid symbols and actual repetition index according to the first embodiment; FIG. 6 is a diagram illustrating an example of frequency hopping based on an actual repetition index when a plurality of invalid symbols are included according to the first embodiment. FIG. 7 is a diagram illustrating an example of RV when frequency hopping based on an actual repetition index is applied according to the second embodiment. FIG. 7 is a diagram illustrating an example of frequency hopping based on RV according to the second embodiment. FIG. 6 is a diagram illustrating an example of frequency hopping based on a nominal repetition index according to a third embodiment; FIG. 7 is a diagram illustrating an example of frequency hopping based on an actual repetition index according to the third embodiment. FIG. 6 is a diagram illustrating an example of frequency hopping based on a nominal repetition index in the case of including invalid symbols according to a third embodiment; FIG. 7 is a diagram illustrating an example of frequency hopping based on a nominal repetition index with multiple invalid symbols according to a third embodiment;

The communication system according to this 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 this communication system, in the case of downlink, the base station device becomes a transmitting device (transmission point, transmitting antenna group, transmitting antenna port group, TRP (Tx/Rx Point)), and the terminal device becomes a receiving device (receiving point, receiving terminal , receiving antenna group, receiving antenna port group). In the case of uplink, the base station device becomes a receiving device, and the terminal device becomes a 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 with human intervention. In other words, 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 forms of data communication that do not require. In this case, the terminal device becomes an MTC terminal. The communication system can use a multicarrier transmission method such as CP-OFDM (Cyclic Prefix - Orthogonal Frequency Division Multiplexing) in uplink and downlink. The communication system applies DFTS-OFDM (Discrete Fourier Transform Spread - Orthogonal Frequency
A transmission method such as division multiplexing (also called SC-FDMA) is used. In addition, although the case where an OFDM transmission method is used in the uplink and downlink will be described below, the present invention is not limited to this, and other transmission methods can be applied.

The base station device and the terminal device in this embodiment use a frequency band called a so-called licensed band, which has been granted usage permission (license) from the country or region where a wireless carrier provides services, and/or It is possible to communicate in a frequency band called an unlicensed band, which does not require permission (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 a communication system 1 according to the present embodiment. The communication system 1 in this 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). Note that the base station device 10 can accommodate a plurality of terminal devices 20 in the coverage 10a.

In FIG. 1, uplink wireless communication r30 includes at least the following uplink physical channels. The uplink physical channel is used to transmit information output from higher layers.
・Physical uplink control channel (PUCCH)
・Physical uplink shared channel (PUSCH)
・Physical Random Access Channel (PRACH)

PUCCH is a physical channel used to transmit uplink control information (UCI). Uplink control information includes positive acknowledgment (ACK)/negative acknowledgment (negative acknowledgment) for downlink data.
NACK). Here, 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, etc. ACK/NACK is also referred to as HARQ-ACK (Hybrid Automatic Repeat request ACKnowledgement), HARQ feedback, HARQ response, HARQ control information, or 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. Also, the bandwidth consists of 12 subcarriers of PUCCH format 0 and PUCCH format 1. Furthermore, in PUCCH format 0, 1 bit (or 2 bits) of ACK/NACK is transmitted using a resource element of 12 subcarriers and 1 OFDM symbol (or 2 OFDM symbols).

The uplink control information includes a scheduling request (SR) used to request PUSCH (Uplink-Shared Channel: UL-SCH) resources for initial transmission. The scheduling request indicates requesting UL-SCH resources for initial transmission.

Uplink control information is downlink channel state information (Channel State Information:
CSI). The downlink channel state information includes a rank indicator (RI) indicating a suitable number of spatial multiplexing (number of layers), a precoding matrix indicator (PMI) indicating a suitable precoder, and a suitable transmission rate. Includes channel quality indicators (CQI) that specify The PMI indicates a codebook determined by the terminal device. The codebook is related to physical downlink shared channel precoding.

In NR, upper layer parameters RI limits can be set. There are multiple configuration parameters for the RI limit, one of which is the Type 1 single panel RI limit, which consists of 8 bits. The type 1 single panel RI constraints, which are bitmap parameters, form the bit sequence 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 limit includes a type 1 single panel RI limit and a type 1 multi-panel RI limit, which consists of 4 bits. The type 1 multi-panel RI constraints, which are bitmap parameters, form the bit sequences r ₄ , r ₃ , r ₂ , r ₁ . Here 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.

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

PUSCH is an uplink data (Uplink Transport Block, Uplink-Shared Channel:
UL-SCH), and CP-OFDM or DFT-S-OFDM is applied as the transmission method. PUSCH may be used to transmit control information such as HARQ-ACK for downlink data and/or channel state information along with the uplink 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/signal processed at the radio resource control layer. The RRC signaling transmitted from the base station device may be common signaling to multiple terminal devices within a cell. The RRC signaling transmitted from the base station device may be dedicated signaling (also referred to as dedicated signaling) for a certain terminal device. That is, user device-specific information is transmitted to a certain terminal device using dedicated signaling. The RRC message can include 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 that is processed (transmitted) in the Medium Access Control layer. For example, 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 are also referred to as higher layer signaling. RRC signaling and/or MAC CE are included in the transport block.

PRACH is used to transmit a preamble used for random access. PRACH is used to transmit random access preambles. PRACH is used to indicate initial connection establishment procedures, handover procedures, connection re-establishment procedures, synchronization (timing adjustment) for uplink transmission, and requests for PUSCH (UL-SCH) resources. used for.

In uplink wireless communication, an uplink reference signal (UL RS) is used as an uplink physical signal. The uplink reference signal includes a demodulation reference signal (DMRS), a sounding reference signal (SRS), a phase tracking reference signal (PTRS), and the like. DMRS is related to the transmission of physical uplink shared channels/physical uplink control channels. For example, when demodulating a physical uplink shared channel/physical uplink control channel, the base station apparatus 10 uses a demodulation reference signal to perform propagation path estimation/propagation path correction.

SRS is not related to physical uplink shared channel/physical uplink control channel transmission. The base station device 10 uses SRS to measure the uplink channel state (CSI measurement).

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

In FIG. 1, at least the following downlink physical channels are used in downlink r31 wireless communication. The downlink physical channel is used to transmit information output from higher layers.
・Physical Broadcast Channel (PBCH)
・Physical downlink control channel (PDCCH)
・Physical Downlink Shared Channel (PDSCH)

The PBCH is used to broadcast a master information block (MIB, Broadcast Channel: BCH) that is commonly used by terminal devices. MIB is one type of system information. For example, the MIB includes downlink transmission bandwidth settings and system frame numbers (SFNs). The MIB may include information indicating at least part of the slot number, subframe number, and radio frame number in which the PBCH is transmitted.

PDCCH is used to transmit downlink control information (DCI). For downlink control information, a plurality of formats (also referred to as DCI formats) are defined based on usage. A DCI format may be defined based on the type and number of bits of DCI that constitute one DCI format. Each format is used depending on its purpose. The downlink control information includes control information for downlink data transmission and control information for uplink data transmission. The DCI format for downlink data transmission is also referred to as downlink assignment (or downlink grant). The DCI format for uplink data transmission is also referred to as uplink grant (or uplink assignment).

One downlink assignment is used for scheduling one PDSCH within one serving cell. The downlink grant may be used at least for scheduling the PDSCH within the same slot in which the downlink grant was transmitted. Downlink assignment includes frequency domain resource allocation for PDSCH, time domain resource allocation, MCS (Modulation and Coding Scheme) for PDSCH, NDI (New Data Indicator) that instructs initial transmission or retransmission, and HARQ in downlink. It includes downlink control information such as information indicating a process number and a Redundancy version indicating the amount of redundancy added to a code word during error correction encoding. The codeword is 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 (transmission repetition number) indicating the number of times the PUSCH is repeatedly transmitted. Note that the DCI format for each downlink data transmission includes information (fields) necessary for its use among the above information.

One uplink grant is used to notify a terminal device of the scheduling of one PUSCH within one serving cell. The uplink grant includes information regarding resource block allocation for transmitting PUSCH (resource block allocation and hopping resource allocation), time domain resource allocation, information regarding MCS of PUSCH (MCS/Redundancy version), information regarding DMRS port, and information regarding PUSCH. It includes uplink control information such as information regarding retransmission, TPC commands for PUSCH, and downlink channel state information (CSI) requests. 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. Note that the DCI format for each uplink data transmission includes information (fields) necessary for its use among the above information.

The OFDM symbol number (position) for transmitting a DMRS symbol is between the first OFDM symbol of a slot and the last OFDM symbol of the PUSCH resource scheduled in that slot if intra frequency hopping is not applied and PUSCH mapping type A is used. given by the signaled period of . If 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 periods per hop. Regarding 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. Regarding PUSCH mapping type A, the 4-symbol period is applicable only when the upper layer parameter indicating the position of the first DMRS is 2.

PDCCH is generated by adding a cyclic redundancy check (CRC) to downlink control information. In the PDCCH, the CRC parity bits are scrambled (also called 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) - RNTI, MCS-C-RNTI scrambled. C-RNTI and CS-RNTI are identifiers for identifying terminal equipment within a cell. Temporary C-RNTI is an identifier for identifying a terminal device that has transmitted a random access preamble during a contention based random access procedure. C-RNTI and Temporary C-RNTI are PDs in a single subframe.
Used to control SCH transmission or PUSCH transmission. CS-RNTI is used to periodically allocate PDSCH or PUSCH resources. Here, the PDCCH (DCI format) scrambled with 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 activation (configuration) of the CS is controlled by the upper layer parameters. conduct. P-RNTI is used to transmit 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 the random access procedure). SP-CSI-RNTI is used for semi-static CSI reporting. MCS-C-RNTI is used when selecting an MCS table with low spectral efficiency.

PDSCH is used to transmit downlink data (downlink transport block, DL-SCH). 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. RRC signaling transmitted from the base station device may be common (cell-specific) to multiple terminal devices within a cell. That is, information common to user equipment within the cell is transmitted using cell-specific RRC signaling. The RRC signaling transmitted from the base station device may be a dedicated message (also referred to as dedicated signaling) for a certain terminal device. That is, 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 in FIG. 1, a synchronization signal (SS) and a downlink reference signal (DL RS) are used as downlink physical signals. Downlink physical signals are not used to transmit information output from higher layers, but are used by the physical layer.

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

The downlink physical channel and the downlink physical signal are also collectively referred to as a downlink signal. In addition, the uplink physical channel and the uplink physical signal are also collectively referred to as an uplink signal. Further, the downlink physical channel and the uplink physical channel are also collectively referred to as a physical channel. Further, the downlink physical signal and the uplink physical signal are also 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 transport channel used in the MAC layer is also referred to as a transport block (TB) 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, transport blocks are mapped to codewords, and encoding processing is performed for each codeword.

FIG. 2 is a schematic block diagram of the configuration of the base station device 10 according to this embodiment. The base station device 10 includes an upper layer processing section (upper layer processing step) 102, a control section (control step) 104, a transmitting section (transmitting step) 106, a transmitting antenna 108, a receiving antenna 110, and a receiving section (receiving step) 112. It consists of: The transmitting unit 106 generates a physical downlink channel according to the logical channel input from the upper layer processing unit 102. The transmitting section 106 includes an encoding section (encoding step) 1060, a modulation section (modulation step) 1062, a downlink control signal generation section (downlink control signal generation step) 1064, a downlink reference signal generation section (downlink reference signal generation section) 1066 (generation step) 1066, a multiplexing section (multiplexing step) 1068, and a wireless transmitting section (wireless transmitting step) 1070. The receiving unit 112 detects a physical uplink channel (demodulating, decoding, etc.) and inputs the contents to the upper layer processing unit 102. The receiving section 112 includes a radio receiving section (radio receiving step) 1120, a propagation path estimation section (propagation path estimation step) 1122, a demultiplexing section (demultiplexing step) 1124, an equalization section (equalization step) 1126, and a demodulation section ( It is configured to include a demodulation step) 1128 and a decoding section (decoding step) 1130.

The upper layer processing unit 102 processes a medium access control (MAC) layer, a packet data convergence protocol (PDCP) layer, a radio link control (RLC) layer, and a radio resource control (Radio resource control) layer. Performs processing on layers higher than the physical layer, such as the Resource Control (RRC) layer. Upper layer processing section 102 generates information necessary to control transmitting section 106 and receiving section 112 and outputs it to control section 104 . Upper layer processing section 102 outputs downlink data (DL-SCH, etc.), system information (MIB, SIB), etc. to transmitting section 106. Note that the DMRS configuration information may be notified to the terminal device by system information (MIB or SIB) instead of being notified by an upper layer such as RRC.

The upper layer processing unit 102 generates system information (MIB or part of SIB) to be broadcast or acquires it from an upper node. Upper layer processing section 102 outputs the system information to be broadcast to transmitting section 106 as BCH/DL-SCH. The MIB is allocated to the PBCH in the transmitter 106. The SIB is allocated to the PDSCH in the transmitter 106. The upper layer processing unit 102 generates system information (SIB) unique to the terminal device or acquires it from a higher level. The SIB is allocated to the PDSCH in the transmitter 106.

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

The upper layer processing unit 102 stores downlink data (transport block, DL-SCH) arranged in the PDSCH, system information specific to the terminal device (System Information Block: SIB), RRC message, MAC CE, and DMRS configuration information as SIB. or MIB, or if not notified by DCI, DMRS configuration information, etc., are generated or acquired from the upper node and output to the transmitter 106. The upper layer processing unit 102 manages various setting information of the terminal device 20. Note that a part of the radio resource control function may be performed in the MAC layer or the physical layer.

The upper layer processing unit 102 receives information regarding the terminal device, such as the functions (UE capabilities) supported by the terminal device, from the terminal device 20 (via the receiving unit 112). The terminal device 20 transmits its own functions to the base station device 10 using an upper layer signal (RRC signaling). The information regarding the terminal device includes information indicating whether the terminal device supports a predetermined function or information indicating that the terminal device has completed installation and testing for the predetermined function. Whether or not a predetermined function is supported includes whether installation and testing for the predetermined function have been completed.

When a terminal device supports a predetermined function, the terminal device transmits information (parameters) indicating whether or not it supports the predetermined function. If a terminal device does not support a predetermined function, the terminal device may not transmit information (parameters) indicating whether or not it supports the predetermined function. That is, whether or not the predetermined function is supported is notified by whether or not information (parameter) indicating whether the predetermined function is supported is transmitted. Note that information (parameter) indicating whether or not a predetermined function is supported may be notified using one bit, 1 or 0.

The upper layer processing unit 102 obtains the DL-SCH from the decoded uplink data (including CRC) 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 at the MAC layer.

The control unit 104 controls the transmitting unit 106 and the receiving unit 112 based on various setting information input from the upper layer processing unit 102/receiving unit 112. Control section 104 generates downlink control information (DCI) based on the configuration information input from upper layer processing section 102/reception section 112, and outputs it to transmission section 106. For example, the control unit 104 takes into consideration the DMRS-related setting information (DMRS configuration 1 or DMRS configuration 2) input from the upper layer processing unit 102/reception unit 112, and controls the DMRS frequency allocation (DMRS configuration 1). In the case of DMRS configuration 2, set the even number subcarrier or odd number subcarrier, or in the case of DMRS configuration 2, set the 0th to 2nd set) and generate the DCI.

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

Transmitting section 106 generates a PBCH, PDCCH, PDSCH, downlink reference signal, etc. according to a signal input from upper layer processing section 102/control section 104. The encoding unit 1060 converts the BCH, DL-SCH, etc. input from the upper layer processing unit 102 into a block code, convolutional code, turbo code, etc. using a predetermined encoding method/determined by the upper layer processing unit 102. Encoding (including repetition) using codes, polar coding, LDPC codes, etc. is performed. Encoding section 1060 punctures the encoded bits based on the encoding rate input from control section 104. Modulating section 1062 data-modulates the encoded bits input from encoding section 1060 using a predetermined modulation method (modulation order) input from control section 104 such as BPSK, QPSK, 16QAM, 64QAM, 256QAM, etc. . The modulation order is based on the MCS index selected by the control section 104.

Downlink control signal generation section 1064 adds a CRC to the DCI input from control section 104. The downlink control signal generation section 1064 performs encryption (scrambling) on the CRC using the RNTI. Further, the downlink control signal generation section 1064 performs QPSK modulation on the DCI to which the CRC is added, and generates a PDCCH. Downlink reference signal generation section 1066 generates a sequence known to the terminal device as a downlink reference signal. The known sequence is determined according to a predetermined rule based on a physical cell identifier for identifying the base station device 10.

Multiplexing section 1068 multiplexes the modulation symbols of each channel input from PDCCH/downlink reference signal/modulation section 1062. That is, multiplexer 1068 maps modulation symbols of each channel of the PDCCH/downlink reference signal to resource elements. Resource elements to be mapped are controlled by downlink scheduling input from the control unit 104. A resource element is the smallest unit of physical resource consisting of one OFDM symbol and one subcarrier. Note that a resource block (RB) is configured by a plurality of resource elements, and scheduling is applied using the RB as the minimum unit. Note that when performing MIMO transmission, the transmitting section 106 includes an encoding section 1060 and a modulating section 1062 in several layers. In this case, the upper layer processing unit 102 sets the MCS for each transport block of each layer.

Radio transmitter 1070 performs inverse fast Fourier transform (IFFT) on multiplexed modulation symbols and the like to generate OFDM symbols. The wireless transmitter 1070 adds a cyclic prefix (CP) to the OFDM symbol to generate a baseband digital signal. Furthermore, the wireless transmitter 1070 converts the digital signal into an analog signal, removes extra frequency components by filtering, upconverts it to a carrier frequency, amplifies the power, and outputs it to the transmitting antenna 108 for transmission.

The receiving unit 112 detects (separates, demodulates, and decodes) the received signal from the terminal device 20 via the receiving antenna 110 according to instructions from the control unit 104, and sends the decoded data to the upper layer processing unit 102/control unit 104. input. The radio receiving unit 1120 down-converts the uplink signal received via the receiving antenna 110 into a baseband signal, removes unnecessary frequency components, and amplifies the uplink signal so that the signal level is maintained appropriately. It controls the level, performs orthogonal demodulation based on the in-phase component and quadrature component of the received signal, and converts the orthogonally demodulated analog signal into a digital signal. Radio receiving section 1120 removes the portion corresponding to CP from the converted digital signal. The radio receiving unit 1120 performs Fast Fourier Transform (FFT) on the signal from which the CP has been removed, and extracts a frequency domain signal. The frequency domain signal is output to a demultiplexer 1124.

Demultiplexing section 1124 converts the signal input from radio reception section 1120 into PUSCH, PUCCH and uplink reference signals based on uplink scheduling information (uplink data channel allocation information, etc.) input from control section 104. and other signals. The separated uplink reference signal is input to the propagation path estimation section 1122. The separated PUSCH and PUCCH are output to the equalization section 1126.

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

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

The decoding section 1130 performs decoding processing on the output signal of the demodulation section based on information on a predetermined coding rate instructed by the coding rate/control section 104. The decoding unit 1130 inputs the decoded data (UL-SCH, etc.) to the upper layer processing unit 102.

FIG. 3 is a schematic block diagram showing the configuration of the terminal device 20 in this embodiment. The terminal device 20 includes an upper layer processing section (upper layer processing step) 202, a control section (control step) 204, a transmitting section (transmitting step) 206, a transmitting antenna 208, a receiving antenna 210, and a receiving section (receiving step) 212. Consists of.

The upper layer processing unit 202 processes a medium access control (MAC) layer, a packet data integration protocol (PDCP) layer, a radio link control (RLC) layer, and a radio resource control (RRC) layer. The upper layer processing unit 202 manages various setting information of its own terminal device. The upper layer processing unit 202 notifies the base station device 10, via the transmitting unit 206, of information indicating the functions of the terminal device supported by the own terminal device (UE Capability). The upper layer processing unit 202 notifies the UE Capability using RRC signaling.

The upper layer processing unit 202 obtains decoded data such as DL-SCH and BCH from the receiving unit 212. The upper layer processing unit 202 generates HARQ-ACK from the DL-SCH error detection result. The upper layer processing unit 202 generates an SR. The upper layer processing unit 202 generates UCI including HARQ-ACK/SR/CSI (including CQI report). Further, when the DMRS configuration information has been notified by the upper layer, the upper layer processing unit 202 inputs information regarding the DMRS configuration to the control unit 204. The upper layer processing section 202 inputs the UCI and UL-SCH to the transmitting section 206. Note that some of the functions of the upper layer processing section 202 may be included in the control section 204.

The control unit 204 interprets downlink control information (DCI) received via the reception unit 212. The control unit 204 controls the transmission unit 206 according to PUSCH scheduling/MCS index/TPC (Transmission Power Control), etc. acquired from the DCI for uplink transmission. The control unit 204 controls the reception unit 212 according to the PDSCH scheduling/MCS index etc. acquired from the DCI for downlink transmission. Furthermore, the control unit 204 specifies the frequency allocation of DMRS according to the information regarding the frequency allocation (port number) of DMRS included in the DCI for downlink transmission and the DMRS configuration information input from the upper layer processing unit 202. .

The transmitting section 206 includes an encoding section (encoding step) 2060, a modulation section (modulation step) 2062, an uplink reference signal generation section (uplink reference signal generation step) 2064, an uplink control signal generation section (uplink control signal generation section) It is configured to include a generation step) 2066, a multiplexing section (multiplexing step) 2068, and a wireless transmitting section (wireless transmitting step) 2070.

The encoding unit 2060 performs convolution encoding and LDPC on the uplink data (UL-SCH) input from the upper layer processing unit 202 under the control of the control unit 204 (according to the encoding rate calculated based on the MCS index). Performs encoding such as polar encoding, turbo encoding, etc.

The modulating section 2062 modulates the encoded bits input from the encoding section 2060 using a modulation method instructed by the control section 204 such as BPSK, QPSK, 16QAM, 64QAM, 256QAM, etc., which is predetermined for each channel. (generates modulation symbols for PUSCH).

The uplink reference signal generation unit 2064 arranges a physical cell identity (referred to as PCI, Cell ID, etc.) for identifying the base station device 10 and an uplink reference signal according to instructions from the control unit 204. A sequence determined by a predetermined rule (formula) is generated based on the bandwidth, cyclic shift, parameter values for DMRS sequence generation, frequency arrangement, etc.

Uplink control signal generation section 2066 encodes the UCI, performs BPSK/QPSK modulation, and generates modulation symbols for PUCCH according to instructions from control section 204.

When an upper layer parameter (frequencyHopping) regarding Rel-15 frequency hopping 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 when transmitting using a plurality of slots, the frequency is changed for each slot. On the other hand, mode 1 is intra-slot hopping, and when transmitting using one or more 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. Regarding frequency allocation in frequency hopping, radio resource allocation in the frequency domain notified by DCI or RRC is applied to the first hop, and frequency allocation for the second hop is applied to the radio resources used in the first hop. , allocate radio resources shifted by the value set in the upper layer parameter (frequencyHoppingOffset) regarding the amount of frequency hopping.

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

Here, CS (configured scheduling, configured grant scheduling) will be explained. There are two types of transmission without dynamic grants. One is configured grant type 1 which is given by RRC and stored as configured grant, and one is given by PDCCH and is stored as configured grant based on L1 signaling indicating configured grant activation or deactivation. The configured grant type 2 is cleared. Type 1 and Type 2 are configured by RRC for each serving cell and for each BWP. Multiple configurations may be active simultaneously only in different serving cells. For type 2, activation and deactivation are independent between serving cells. For the same serving cell, the MAC entity is configured as either type 1 or type 2. When type 1 is configured, RRC configures the following parameters.
・cs-RNTI: CS-RNTI for retransmission
・periodity: period of configured grant type 1 ・timeDomainOffset: offset of the resource with respect to SFN=0 in the time domain ・timeDomainAllocation: arrangement of the configured grant in the time domain, including the parameter startSymbolAndLength ・nrofHARQ-Processes: number of HARQ processes also of type 2 is set, RRC sets the following parameters:
・cs-RNTI: CS-RNTI for activation, deactivation, and retransmission
- periodicity: period of configured grant type 2 - nrofHARQ-Processes: number of HARQ processes or ConfiguredGrantConfig is used to configure uplink transmission without dynamic grants according to two schemes. The actual uplink grant is configured via RRC in Configured Grant Type 1, and is provided via PDCCH processed by CS-RNTI in Configured Grant Type 2.

The parameter repK set in the upper layer defines the number of repetitions applied to the transmitted transport block. The parameter repK-RV set in the upper layer indicates the redundancy version pattern applied to the repetition. If repK-RV is not set (not given), the redundancy version of each actual iteration in the configured grant is set to zero. Otherwise, for the nth transmission opportunity among all actual repetitions (including the omitted actual repetition) during the K nominal repetitions, the RV sequence (redundancy version pattern) to be The transmission associated with the (mod (n-1, 4)+1)th value among the values is performed. Further, when the RV sequence to be set is {0, 2, 3, 1}, the initial transmission of one transport block is started at the first transmission opportunity of K repetitions. If the RV sequence to be set is {0, 3, 0, 3}, it starts at any transmission opportunity of K repetitions associated with RV=0. When the RV sequence to be set is {0, 0, 0, 0}, it starts at any transmission opportunity repeated K times, excluding the last transmission opportunity when K=8. For any RV sequence, the repetition occurs after K repeated transmissions, or at the last transmission opportunity during K repetitions within period P, or after receiving an uplink grant to schedule the same transport block within period P. is terminated if either of the times is reached for the first time. In Rel-15, the terminal device does not expect a time period for repeated transmission K times to be set that is longer than the time period calculated by the period P. For both type 1 and type 2 PUSCH transmissions with configured grants, when the terminal is configured with repK>1, the terminal repeats its transport block over successive slots of repK. At this time, the terminal device applies the same symbol arrangement in each slot. If the procedure of the terminal equipment regarding the slot configuration determination determines (determines) the symbol of the allocated slot as a downlink symbol, the transmission in that slot is omitted for PUSCH transmission of multiple slots. When repK is set, the value can be set to 1, 2, 4, or 8 times. However, if the RRC parameter itself does not exist, the number of repetitions is set to 1 and transmission is performed. Further, repK-RV can be set to any one of {0, 2, 3, 1}, {0, 3, 0, 3}, and {0, 0, 0, 0}. Note that signals of different redundancy versions generated from the same transport block are signals composed of the same transport block (information bit sequence), but at least some of the encoded bits composed are different.

In NR Release 16, PUSCH repetition type B was specified. Except for PUSCH, which transmits CSI reports without transport blocks, the nominal number of repetitions is given by the upper layer parameter numberofrepetitions. If the slot in which PUSCH transmission starts is _Ks , the number of symbols per slot _{is Nsymb} , the start symbol for the beginning of the slot is S, and the number of consecutive symbols counting from the symbol S allocated as PUSCH is L, then the nominal The slot where repetition starts is given by K _s +ceil ((S+n·L)/N _symb ), and the start symbol for the beginning of the slot is given by mod (S+n·L, N _symb ). Also, the slot where the nominal repetition ends is K _s + ceil ((S+(n+1)・L-1)/N _symb ), and the end symbol for the beginning of the slot is mod (S+(n+1)・L-1, N _symb ).

For PUSCH repetition type B, for each of the K nominal repetitions, after determining invalid symbols due to TDD configuration and reception of downlink control information, remaining symbols are determined for PUSCH repetition type B transmission. Considered a potentially valid symbol. If the number of potentially valid symbols for PUSCH repetition type B transmission in a given nominal repetition is greater than zero, then that nominal repetition constitutes one or more actual repetitions. Here, each actual repetition constitutes a set of consecutive valid symbols used for PUSCH repetition type B transmission within a slot. The actual repetition by one symbol is omitted except in the case L=1. Actual repeats may be omitted based on other conditions. The redundancy version is applied based on the actual number of iterations.

Inter-repetition frequency hopping in PUSCH repetition type B will be explained. The start RB in the actual iteration within the nth nominal iteration is determined by the start RB in the uplink BWP when mod (n, 2) = 0, and the start RB in the uplink BWP when mod (n, 2) = 1. It is determined by the start RB in the link BWP, the offset during frequency hopping notified by RRC signaling, and the bandwidth of the uplink BWP. On the other hand, in inter-slot frequency hopping, a start RB is determined based on a certain slot number.

As disclosed in Non-Patent Document 2, in applying frequency hopping for each slot, the number of slots becomes a problem. For example, control can be performed by notifying the number of slots from the base station to the terminal using RRC signaling. FIG. 4 shows an example in which frequency hopping is applied every two slots. FIG. 4 shows a case where some OFDM symbols in a slot are used, with the diagonal lines indicating DMRS symbols and the dots indicating data OFDM symbols. In the case of FIG. 4, since transmission is performed using the same frequency between two slots that are transmitted on the same frequency, channel estimation can be performed with the DMRS shared between the two slots. In other words, channel estimation can be performed using more DMRSs than when channel estimation is performed using only DMRSs included in one slot, and thus channel estimation accuracy can be improved. Alternatively, by reducing the DMRS included in all or some slots of multiple slots transmitted on the same frequency, the overhead caused by DMRS can be reduced, and the same amount of information can be transmitted with a lower MCS or with the same MCS. You can send a lot of information. Note that the RRC signaling notification method may be selected from inter-slot frequency hopping, inter-repetition frequency hopping, and frequency hopping for each multiple slot, and furthermore, frequency hopping for each multiple repetition may be selected using the same parameter. You can do it like this.

In the above, the number of slots (hereinafter referred to as the FH slot number) for performing frequency hopping for each slot is notified by RRC signaling, but the present invention is not limited to this. For example, the nominal repetition index n and the nominal repetition number K and a predetermined value A. For example, the frequency position may be determined depending on whether n<ceil (K/A) or n≧ceil (K/A). Here, the ceiling function (ceil) may be used as a floor function.

When notifying the number of slots (hereinafter referred to as the FH slot number) when performing frequency hopping for each slot by RRC signaling, the number of FH slots should be set to be the same as or smaller than the number of repeated transmissions, but the FH The number of slots may be set to a value larger than the number of repeated transmissions. In this case, the number of FH slots is interpreted as the same as the number of repeated transmissions, and the terminal device and base station device perform transmission and reception processing. As a result, even if the number of repeated transmissions is dynamically notified by DCI and the number of FH slots is semi-statically notified by RRC, terminal devices and base station devices can perform frequency hopping for each slot. .

If consecutive slots or OFDM symbols can be secured as PUSCH, it is possible to hop two slots at a time as shown in FIG. 4, but this is not always possible. Therefore, the operation when an invalid OFDM symbol (slot) is included in the nominal repetition will be explained. FIG. 5 shows an example where invalid OFDM symbols (slots) are included in the nominal repetition. If invalid OFDM symbols (slots) are included in the nominal repetition transmission as shown in Figure 5, if the NR Release 16 specification is applied as is, frequency hopping will be applied based on the nominal repetition. The third repetition will be transmitted on a different frequency (hop) than the third repetition. In this case, since the third and fourth transmissions are not transmitted using the same frequency resource, there is a problem that it is not possible to share the DMRS in different repetitions and improve channel estimation accuracy. Therefore, instead of performing frequency hopping based on the nominal number of repetitions (index), frequency hopping is applied based on the actual number of repetitions as shown in FIG. As a result, when there are two consecutive resources, transmission can be performed using the same frequency resource. Thereby, channel estimation accuracy can be improved by DMRS bundling. By the way, for example, when frequency hopping is determined based on an actual repetition index, there is a possibility that the signals may be transmitted using the same frequency resource even though they are separated by invalid symbols. If DMRS bundling is applied when radio resources are temporally divided, channel estimation accuracy may not be able to be improved because the channel is fluctuating. Therefore, as shown in FIG. 7, when radio resources are divided due to invalid symbols or the like, frequency hopping using temporally continuous radio resources can be applied by resetting the FH slot index. In other words, when transmitting using temporally discontinuous resources, frequencies may be hopped. However, in this case, depending on the status of the invalid symbol, there is a possibility that transmission may use a large amount of one of the frequency resources, and there is a concern that the frequency diversity effect may not be maximized. Therefore, as shown in FIG. 8, the timing of frequency hopping may be controlled only by the actual repetition index.

Although the above description assumes inter-slot repetition, the present invention is not limited to inter-slot repetition, and may be applied to intra-slot repetition. In this case, settings regarding DMRS bundling by RRC signaling or DCI signaling are based on the repetition unit, that is, the number of repetitions within a slot, rather than the slot. Furthermore, the QCL is limited to within one slot of intra-slot repetition, and the repetition outside the slot may not be considered as QCL.

When DMRS bundling can be performed, channel compensation can be performed using DMRS included in other slots, so it is not necessarily necessary to insert DMRS into a slot. If DMRS is not inserted, many information bits or parity bits can be transmitted, which can reduce the communication error rate, leading to improved quality or coverage. For example, when settings are made to reduce DMRS using control information such as RRC signaling, DMRS is inserted only in the first repetition and not inserted in the second and subsequent repetitions, thereby reducing the number of information bits. , or the parity bit can be sent. However, if transmission is started from the second time among the repetitions specified by the base station device, DMRS will not be transmitted. The configuration is such that the DMRS is placed only in slots (repetitions) where RV is 0, and the DMRS is not placed in slots (repetitions) where RV is other than 0. The above will be explained using FIG. 6. 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 repetition, with the DMRS symbols in the slots shown with diagonal lines and the data OFDM symbols marked with dots. 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. In other words, in NR, it is not specified that repeated transmission starts from a slot (repetition) where RV is other than 0, so transmission always starts from a slot where RV=0. This makes it possible to avoid performing only transmission that does not include DMRS. Here, although the configuration is such that the DMRS is not included in slots with RV other than 0, the configuration may be such that the DMRS is not included completely and may be reduced. For example, only the front-loaded DMRS may be transmitted, and all or some of the additional DMRS configured in RRC may be reduced. Information regarding the reduction criteria may be notified by RRC signaling. However, if the above transmission is performed when intra-slot frequency hopping/inter-slot frequency hopping/inter-repetition frequency hopping is applied, there is a problem that DMRS will not be transmitted at offset hops. Therefore, if any of the above frequency hopping is applied, settings related to DMRS bundling by RRC are performed, and even if DMRS bundling is enabled, DMRS is transmitted every repetition (slot). You can also use it as Regarding DMRS reduction, information regarding the time domain slot of the DMRS is notified by RRC signaling or DCI signaling, and the information is applied to each set slot (repetition), and DMRS is transmitted outside the set slot. Good too.

Radio transmitter 2070 performs IFFT (Inverse Fast Fourier Transform) on the multiplexed signal to generate OFDM symbols. The wireless transmitter 2070 adds a CP to the OFDM symbol and generates a baseband digital signal. Furthermore, the wireless transmitter 2070 converts the baseband digital signal into an analog signal, removes extra frequency components, converts it to a carrier frequency by up-converting, amplifies the power, and sends the signal to the base station via the transmitting antenna 208. to the device 10.

The receiving section 212 includes a radio receiving section (radio receiving step) 2120, a demultiplexing section (demultiplexing step) 2122, a propagation path estimation section (propagation path estimation step) 2144, an equalization section (equalization step) 2126, and a demodulation section ( It is configured to include a demodulation step) 2128 and a decoding section (decoding step) 2130.

The radio receiving unit 2120 down-converts the downlink signal received via the receiving antenna 210 into a baseband signal, removes unnecessary frequency components, and adjusts the amplification level so that the signal level is maintained appropriately. control, perform orthogonal demodulation based on the in-phase component and quadrature component of the received signal, and convert the orthogonally demodulated analog signal 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 demultiplexer 2122 separates the extracted frequency domain signal into a downlink reference signal, PDCCH, PDSCH, and PBCH. The propagation path estimator 2124 estimates the frequency response (or delay profile) using a downlink reference signal (DM-RS, etc.). The frequency response result of propagation path estimation for demodulation is input to equalization section 1126. The propagation path estimation unit 2124 uses downlink reference signals (CSI-RS, etc.) to measure uplink channel conditions (RSRP (Reference Signal Received Power), RSRQ (Reference Signal Received Quality), RSSI (Received Signal Strength). Measure the SINR (Signal to Interference plus Noise power Ratio). Measurement of downlink channel conditions is used for determining MCS for PUSCH, etc. The measurement results of downlink channel conditions are used for determining CQI indexes and the like.

Equalization section 2126 generates equalization weights based on the MMSE norm from the frequency response input from channel estimation section 2124. The equalizer 2126 receives the input signal from the demultiplexer 2122 (
PUCCH, PDSCH, PBCH, etc.) is multiplied by the equalization weight. The demodulation unit 2128 performs demodulation processing based on modulation order information that is predetermined/instructed by the control unit 204.

The decoding section 2130 performs a decoding process on the output signal of the demodulation section 2128 based on the predetermined coding rate information instructed by the control section 204. The decoding unit 2130 inputs the decoded data (DL-SCH, etc.) to the upper layer processing unit 202.
(Second embodiment)

In the first embodiment, the method of changing hops by notifying the number of repetitions (number of slots) until frequency hopping is performed through RRC signaling has been described. In this embodiment, a method of hopping frequencies without notifying additional RRC signaling will be described.

In the specifications up to NR Release 16, either 0, 1, 2, or 3 is specified as RV for transmission. In the case of congregant grant scheduling, the RV sequence (RV pattern) is one of {0, 0, 0, 0}, {0, 3, 0, 3}, and {0, 2, 3, 1}. is determined in repeated transmissions. For example, in the case of {0, 3, 0, 3}, better characteristics can be obtained due to the frequency diversity effect by transmitting at different frequencies than by transmitting at the same frequency for the first and third transmissions. can. Therefore, as shown in FIG. 9, when performing transmission where RV is 0, transmission is performed by hopping the frequency by frequency hopping. As a result, it becomes possible to perform transmission with the frequency changed every time the actual repetition is performed twice, and transmission is no longer biased toward some frequency resources. In the case of {0, 2, 3, 1}, as shown in FIG. 10, transmission is performed with the frequency changed every four times. Here, the RV sequence (RV pattern) is notified from the base station device to the terminal device by RRC signaling. Note that the RV sequence is not limited to the three patterns mentioned above, but may be of any type, and any sequence can be applied as long as frequency hopping is performed when transmitting using the same RV. can. Whether or not to determine the number of repetitions for frequency hopping based on the RV sequence may be determined by RRC signaling. (Third embodiment)

In the second embodiment, a method of associating the number of repetitions (number of slots) until frequency hopping is performed with an RV sequence has been described. In this embodiment, a method of associating information with information regarding DMRS bundling will be described.

When settings related to DMRS bundling are transmitted by RRC signaling or DCI signaling and settings related to DMRS bundling are performed at the terminal, information regarding the DMRS time domain slot is notified to the terminal device by RRC signaling or DCI signaling. be done. The terminal device transmits from the first transmission slot to the number of slots determined by the information regarding the time domain slot so that DMRS bundling can be applied by the base station device that is the receiver. In other words, transmission is performed in a manner that can be regarded as QCL (Quasi-Colocation). In other words, transmission is performed so that the amplitude and phase of the propagation path do not change between slots (so that they do not become discontinuous). Furthermore, the slots specified by the information regarding time-domain slots may not be continuous, but may be transmitted such that non-consecutive slots serve as the QCL. Note that whether to enable or disable transmission from a time other than the first time of the allocated repetition may be set by RRC signaling.

The timing of applying frequency hopping may be synchronized with the above-mentioned DMRS bundling. In other words, a configuration may be adopted in which frequency hopping is not applied between different slots that share a DMRS, and frequency hopping is performed when transmitting a slot that does not share a DMRS with a previously transmitted slot. This eliminates the need for separate settings using RRC signaling for frequency hopping using multiple slots and DMRS bundling, and it is possible to reduce control information. FIG. 11 shows an example of frequency hopping when 3 is notified as the DMRS bundling number by control information such as RRC signaling. As shown in the figure, depending on the actual number of repetitions, for repetitions 1 to 3, transmission is performed at a frequency without an offset, and for repetitions 4 to 6, transmission is performed at a frequency that reflects the offset. Note that the DMRS bundling number may be any natural number below a predetermined value, may be a power of 2 such as 1, 2, 4, or 8, or may be a power of 2 plus one or more predetermined numbers. (for example, 12) may be specified (notified) by RRC signaling.

FIG. 12 shows an example where invalid symbols are included when the number of DMRS bundling is 3. When frequency hopping is applied based on the actual number of repetitions, if control is performed based on the actual number of repetitions as shown in the figure, the repetitions may be separated in time. Therefore, DMRS bundling and accompanying frequency hopping may be performed based on the nominal number of repetitions as shown in FIG. 13. This makes it possible to apply DMRS bundling in temporally coherent slots even when there are actually many invalid symbols and continuous resources cannot be secured. For example, in FIG. 13, a case where the slot corresponding to the nominal repetition index 5 cannot be transmitted is shown in FIG. In this case, actual repetition index 3 and actual repetition index 4 are slots that are not consecutive in time, but are included in nominal repetition index 3 to nominal repetition index 5, and DMRS bundling is applied. Therefore, channel estimation accuracy can be improved. Note that whether to apply DMRS bundling and/or frequency hopping based on the actual repetition index or based on the nominal repetition index may be determined based on control information such as RRC signaling.

The program that runs on the device related to the present invention may be a program that controls a Central Processing Unit (CPU) or the like to cause the computer to function so as to realize the functions of the above-described embodiments related to the present invention. Programs or information handled by programs are temporarily read into volatile memory such as Random Access Memory (RAM) during processing, or stored in non-volatile memory such as flash memory or Hard Disk Drive (HDD), and then transferred as needed. Reading, modification, and writing are performed by the CPU accordingly.

Note that a part of the apparatus in the embodiment described above may be realized by a computer. In that case, a program for realizing the functions of the embodiment may be recorded on a computer-readable recording medium. The program recorded on this recording medium may be read into a computer system and executed. The "computer system" herein refers to a computer system built into the device, and includes hardware such as an operating system and peripheral devices. Further, the "computer-readable recording medium" may be any of semiconductor recording media, optical recording media, magnetic recording media, etc.

Furthermore, a "computer-readable recording medium" refers to a medium that dynamically stores a program for a short period of time, such as a communication line when transmitting a program via a network such as the Internet or a communication line such as a telephone line. In that case, it may also include a device that retains a program for a certain period of time, such as a volatile memory inside a computer system that is a server or client. Further, the above-mentioned program may be one for realizing a part of the above-mentioned functions, or may be one that can realize the above-mentioned functions in combination with a program already recorded in the computer system.

Additionally, each functional block or feature of the apparatus used in the embodiments described above may be implemented or performed in an electrical circuit, typically an integrated circuit or multiple integrated circuits. An electrical circuit designed to perform the functions described herein may be a general purpose processor, digital signal processor (DSP), application specific integrated circuit (ASIC), field programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic, discrete hardware components, or combinations thereof. A general purpose processor may be a microprocessor or a conventional processor, controller, microcontroller, or state machine. The electric circuit described above may be configured with a digital circuit or an analog circuit. Further, if an integrated circuit technology that replaces the current integrated circuit emerges due to advances in semiconductor technology, it is also possible to use an integrated circuit based on this technology.

Note that the present invention is not limited to the above-described embodiments. Although an example of the device has been described in the embodiment, the present invention is not limited thereto, and can be applied to stationary or non-movable electronic devices installed indoors or outdoors, such as AV devices, kitchen devices, It can be applied to terminal devices or communication devices such as cleaning/washing equipment, air conditioning equipment, office equipment, vending machines, and other household equipment.

Although the embodiments of the present invention have been described above in detail with reference to the drawings, the specific configuration is not limited to these embodiments, and may include design changes within the scope of the gist of the present invention. Further, the present invention can be modified in various ways within the scope shown in the claims, and embodiments obtained by appropriately combining technical means disclosed in different embodiments are also included within the technical scope of the present invention. It will be done. Also included are configurations in which the elements described in each of the above embodiments are replaced with each other and have similar effects.

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

10 Base station device 20 Terminal device 10a Range in which the base station device 10 can connect to the terminal device 102 Upper layer processing section 104 Control section 106 Transmitting section 108 Transmitting antenna 110 Receiving antenna 112 Receiving section 1060 Encoding section 1062 Modulating section 1064 Downlink Control signal generation section 1066 Downlink reference signal generation section 1068 Multiplexing section 1070 Radio transmission section 1120 Radio reception section 1122 Channel estimation section 1124 Demultiplexing section 1126 Equalization section 1128 Demodulation section 1130 Decoding section 202 Upper layer processing section 204 Control section 206 Transmitting section 208 Transmitting antenna 210 Receiving antenna 212 Receiving section 2060 Encoding section 2062 Modulating section 2064 Uplink reference signal generating section 2066 Uplink control signal generating section 2068 Multiplexing section 2070 Radio transmitting section 2120 Radio receiving section 2122 Demultiplexing section 2124 Propagation path Estimating section 2126 Equalizing section 2128 Demodulating section 2130 Decoding section

Claims (8)

A terminal device that repeatedly transmits data to a base station device,
an upper layer processing unit that sets a nominal number of repetitions in the repeated transmission and a frequency hopping method for changing the transmission frequency in the repeated transmission;
comprising a transmitter that determines the actual number of repetitions based on the nominal number of repetitions and transmits the actual number of repetitions,
The transmitter is a terminal device that applies frequency hopping based on the number of repetitions to which DMRS bundling is applied and the nominal number of repetitions. The terminal device according to claim 1, wherein the number of repetitions for applying the DMRS bundling is set by the upper layer processing unit. The terminal device according to claim 1, wherein the number of repetitions of applying the DMRS bundling is associated with a redundancy version series set by an upper layer processing unit. The frequency hopping is applied when the frequency hopping method indicates a predetermined method, and when the frequency hopping method indicates a method other than the predetermined method, the transmitter applies frequency hopping based on the nominal number of repetitions. 4. A terminal device according to claim 1. A base station device that repeatedly transmits data to a terminal device,
an upper layer processing unit that sets a nominal number of repetitions in the repeated transmission and a frequency hopping method for changing the transmission frequency in the repeated transmission;
comprising a transmitter that determines the actual number of repetitions based on the nominal number of repetitions and transmits the actual number of repetitions,
The transmitter is a base station device that applies frequency hopping based on the number of repetitions to which DMRS bundling is applied and the nominal number of repetitions. The base station apparatus according to claim 1, wherein the number of repetitions for applying the DMRS bundling is set by the upper layer processing unit. 6. The base station apparatus according to claim 5, wherein the number of repetitions of applying the DMRS bundling is associated with a redundancy version sequence set by an upper layer processing unit. The frequency hopping is applied when the frequency hopping method indicates a predetermined method, and when the frequency hopping method indicates a method other than the predetermined method, the transmitter applies frequency hopping based on the nominal number of repetitions. The base station device according to claim 5.

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