Terminal device and communication method

Abstract

In the present invention, in a case where HARQ-ACK information is to be transmitted by a PUSCH by using an uplink resource indicated by a random access response, transmission power for the PUSCH is determined by using at least: a parameter indicating a target power level on the reception side of a random access preamble; and a parameter indicating a power offset between the random access preamble and the PUSCH including the HARQ-ACK information.

Description

[Technical Field]

[0001] The present invention relates to a terminal device and a communication method. This application claims priority with respect to Japanese Patent Application No. 2021-157560, filed in Japan on September 28, 2021, and the contents of that application are incorporated herein by reference. [Background technology]

[0002] The cellular mobile communication radio access method and radio network (hereinafter referred to as "Long Term Evolution (LTE)" or "EUTRA: Evolved Universal Terrestrial Radio Access") is being considered in the 3rd Generation Partnership Project (3GPP). In LTE, base station equipment is also called eNodeB (evolved NodeB), and terminal equipment is also called UE (User Equipment). LTE is a cellular communication system in which multiple base station devices are arranged in a cell-like structure to cover different areas. A single base station device may manage multiple serving cells.

[0003] 3GPP is currently considering and standardizing the next-generation standard (NR: New Radio) as the communication method for 5G. NR is required to meet the requirements of three scenarios—eMBB (enhanced Mobile Broadband), mMTC (massive Machine Type Communication), and URLLC (Ultra Reliable and Low Latency Communication)—within a single technological framework.

[0004] It is being considered that multiple base station devices will communicate with a terminal device simultaneously using different frequency bands (Non-Patent Document 1). It is also being considered that three or more base station devices will communicate with a given terminal device simultaneously. Some base station devices will communicate with the terminal device using both the downlink and uplink frequency bands simultaneously, while some base station devices will communicate with the terminal device using only the downlink frequency band. The terminal device will switch the uplink between multiple base station devices in multiple secondary cell groups. [Prior art documents] [Non-patent literature]

[0005] [Non-Patent Document 1] "Title: Multi-RAT Multi Connectivity (MR-MC) for 5G-Advanced", RWS-210183, Samsung 3GPP TSG RAN Rel-18 workshop, Electronic Meeting, June 28-July 2, 2021 [Overview of the project] [Problems that the invention aims to solve]

[0006] To properly control data retransmission, it is necessary for the data receiver to provide appropriate feedback to the data transmitter regarding data error detection results, data reception results (received data was not erroneous, received data was erroneous, or data was not received), etc. Based on the information fed back from the data receiver, the data transmitter retransmits data that was not properly received by the receiver. For example, the data transmitter is a base station device, the data receiver is a terminal device, the data is a transport block (a transport block transmitted and received by a PDSCH), and the data error detection results and reception results are HARQ-ACKs. By realizing appropriate retransmission control, efficient communication is achieved. One aspect of the present invention provides a terminal device for efficient communication and a communication method used in the terminal device. [Means for solving the problem]

[0007] (1) A first aspect of the present invention is a terminal device comprising a processor and a memory for storing computer program code, wherein when HARQ-ACK information is transmitted via PUSCH using uplink resources indicated in a random access response, the device performs an operation that includes determining the transmission power of PUSCH using at least a parameter indicating the target power level at the receiving end of the random access preamble and a parameter indicating the power offset between the random access preamble and PUSCH containing the HARQ-ACK information.

[0008] (2) Furthermore, when transmitting message 3 via PUSCH using the uplink resources indicated in the random access response, the transmit power of the PUSCH is determined using at least a parameter indicating the target power level at the receiving end of the random access preamble and a parameter indicating the power offset between the random access preamble and the PUSCH containing message 3.

[0009] (3) A second aspect of the present invention is a communication method used in a terminal device, which includes the step of determining the transmission power of a PUSCH when transmitting HARQ-ACK information using uplink resources indicated in a random access response, using at least a parameter indicating the target power level at the receiving end of the random access preamble and a parameter indicating the power offset between the random access preamble and the PUSCH containing the HARQ-ACK information.

[0010] (4) Furthermore, when transmitting message 3 via PUSCH using the uplink resources indicated in the random access response, the transmit power of the PUSCH is determined using at least a parameter indicating the target power level at the receiving end of the random access preamble and a parameter indicating the power offset between the random access preamble and the PUSCH containing message 3. [Effects of the Invention]

[0011] According to one aspect of this invention, a terminal device can communicate efficiently. Furthermore, a base station device can communicate efficiently. [Brief explanation of the drawing]

[0012] [Figure 1] This is a conceptual diagram of a wireless communication system according to one aspect of this embodiment. [Figure 2] This is a schematic diagram showing an example of a resource grid in a subframe according to one aspect of this embodiment. [Figure 3] This is a schematic block diagram showing the configuration of a terminal device 1 according to one aspect of this embodiment. [Figure 4] This is a schematic block diagram showing the configuration of a base station device 3 according to one aspect of this embodiment. [Figure 5] This figure shows an example of the process for setting parameters related to the transmission power of terminal device 1 according to one aspect of this embodiment. [Modes for carrying out the invention]

[0013] Hereinafter, embodiments of the present invention will be described.

[0014] "A, and / or, B" may be a term including "A", "B", or "A and B".

[0015] That a parameter or information indicates one or more values may mean that the parameter or the information at least includes the parameter or information indicating the one or more values. The upper layer parameter may be a single upper layer parameter. The upper layer parameter may be an information element (IE: Information Element) including a plurality of parameters.

[0016] FIG. 1 is a conceptual diagram of a wireless communication system according to an aspect of the present embodiment. In FIG. 1, the wireless communication system includes terminal devices 1A to 1C and base station devices 3A to 3C. Hereinafter, the terminal devices 1A to 1C are also referred to as terminal devices 1 (UE). Hereinafter, the base station devices 3A to 3C are also referred to as base station devices 3 (gNB).

[0017] The base station device 3 may be configured to include one or both of an MCG (Master Cell Group) and an SCG (Secondary Cell Group). The MCG is a group of serving cells comprising at least a PCell (Primary Cell). The SCG is a group of serving cells comprising at least a PSCell (Primary Secondary Cell). A PCell is a cell (a cell on which an initial connection establishment procedure or a connection re-establishment procedure is performed) by the terminal device 1. A PSCell is a serving cell on which a random access procedure is performed by the terminal device 1. The MCG may be configured to include one or more SCells (Secondary Cells). The SCG may be configured to include one or more SCells. A serving cell identity is a short identifier for identifying a serving cell. The serving cell identity may be provided by a higher-layer parameter.

[0018] A serving cell group (cell group) is a general term for MCG, SCG, and PUCCH cell groups. A serving cell group may contain one or more serving cells (or component carriers). One or more serving cells (or component carriers) included in a serving cell group may be operated by carrier aggregation.

[0019] Terminal device 1 communicates simultaneously with base station device 3A (third base station device), base station device 3B (first base station device), and base station device 3C (second base station device). Communication with terminal device 1 is performed using different frequency bands (carrier frequency, frequency spectrum) than base station devices 3A, 3B, and 3C. This operation may also be called carrier aggregation or dual connectivity. Communication between terminal device 1 and base station device 3A, communication between terminal device 1 and base station device 3B, and communication between terminal device 1 and base station device 3C are each composed of different cells (serving cells). Base station device 3A uses the downlink frequency band and the uplink frequency band. Base station device 3B uses the downlink frequency band and the uplink frequency band. Base station device 3C uses only the downlink frequency band. Alternatively, base station device 3A uses the downlink frequency band and the uplink frequency band. Base station device 3B uses only the downlink frequency band. Base station device 3C uses both the downlink and uplink frequency bands. In terminal device 1, base station device 3, which uses the uplink frequency band, is switched between base station device 3B and base station device 3C. In terminal device 1, base station device 3, which uses the uplink frequency band of the secondary cell group, is switched between base station device 3B and base station device 3C. Base station devices 3A, 3B, and 3C are connected by wire or wireless, and control information and data are exchanged. Terminal device 1 makes an initial connection with base station device 3A. After the connection with base station device 3A is established, terminal device 1 adds connections to base station devices 3B and 3C. Terminal device 1 adds frequency bands to be used for communication. Terminal device 1 adds cells (serving cells) to be used for communication. Terminal device 1 adds a connection to base station device 3.

[0020] In a wireless communication system, the terminal device 1 and the base station device 3 may use one or more communication methods. For example, CP-OFDM (Cyclic Prefix-Orthogonal Frequency Division Multiplex) may be used in the downlink of the wireless communication system. In addition, either CP-OFDM or DFT-s-OFDM (Discrete Fourier Transform-spread-Orthogonal Frequency Division Multiplex) may be used in the uplink of the wireless communication system. Here, DFT-s-OFDM is a communication method in which transform precoding is applied prior to signal generation in CP-OFDM. Here, transform precoding is also called DFT precoding.

[0021] As shown in Figure 1, the base station device 3 may consist of one transceiver (or a transmitting point, a transmitting device, a receiving point, a receiving device, and a transceiver). On the other hand, in some cases, the base station device 3 may consist of multiple transceivers. If the base station device 3 consists of multiple transceivers, each of the multiple transceivers may be located at a different geographical location.

[0022] For a given subcarrier spacing μ, the subcarrier spacing (SCS) Δf is given by Δf = 2 μ It may also be ×15kHz. For example, the subcarrier spacing setting μ may be 0, 1, 2, 3, or 4.

[0023] Time unit (T) c = 1 / (Δf max ×N f ) may be used to represent length in the time domain. Here, Δf max =480kHz is also acceptable. f It may also be = 4096. Furthermore, the constant κ is given by κ = Δf max ×N f / (Δfref N f,ref ) may be 64. Also, Δf ref may be 15 kHz. N f,ref is 2048.

[0024] The transmission of downlink / uplink signals may be organized by a radio frame (system frame, frame) of length Tf. Here, Tf = (Δfmax × Nf / 100) × Ts = 10 ms may also be applicable.

[0025] The radio frame may be composed of 10 subframes. Here, the length of the subframe Tsf = (Δfmax × Nf / 1000) × Ts = 1 ms may also be applicable. Also, the number of OFDM symbols per subframe may be Nsubframe, μsymb = Nslotsymb × Nsubframe, μslot.

[0026] As the unit in the time domain of the communication method used in the wireless communication system, an OFDM symbol is used. For example, the OFDM symbol may be used as the unit in the time domain of CP - OFDM. Also, the OFDM symbol may be used as the unit in the time domain of DFT - s - OFDM.

[0027] A slot may be composed of a plurality of OFDM symbols. For example, one slot may be composed of Nslotsymb consecutive OFDM symbols. For example, in the setting of normal CP, Nslotsymb = 14 may also be applicable. Also, in the setting of extended CP, Nslotsymb = 12 may also be applicable.

[0028] The slot may be indexed in the time domain. For example, the slot index nμs may be given in ascending order as an integer value within the range of 0 to Nsubframe, μslot - 1 in the subframe. Also, the slot index nμs,f may be given in ascending order as an integer value within the range of 0 to Nframe, μslot - 1 in the radio frame.

[0029] Figure 2 shows an example of the configuration of a resource grid according to one aspect of this embodiment. In the resource grid of Figure 2, the horizontal axis is the OFDM symbol index lsym, and the vertical axis is the subcarrier index ksc. The resource grid of Figure 2 contains Nsize, μgrid, x × NRBsc subcarriers and Nsubframe, μsymb OFDM symbols. Here, Nsize, μgrid, and x represent the bandwidth of the SCS intrinsic carrier. The units of the values ​​of Nsize, μgrid, and x are resource blocks.

[0030] Within a resource grid, resources identified by the subcarrier index ksc and OFDM symbol index lsym are also referred to as resource elements (RE).

[0031] A Resource Block (RB) contains NRBsc consecutive subcarriers. The term "Resource Block" encompasses Common Resource Blocks, Physical Resource Blocks (PRBs), and Virtual Resource Blocks (VRBs). For example, NRBsc may be 12.

[0032] A BandWidth Part (BWP) may be configured as a subset of the resource grid. Here, a BWP configured for a downlink is also called a downlink BWP, and a BWP configured for an uplink is also called an uplink BWP.

[0033] An antenna port may be defined such that the channel over which a symbol on the antenna port is conveyed can be inferred from the channel over which another symbol on the same antenna port is conveyed. For example, a channel may correspond to a physical channel, and a symbol may correspond to a modulation symbol placed on a resource element. Here, "channel" may mean "propagation path," and "channel" may mean "physical channel."

[0034] Two antenna ports are considered to be in a Quasi-Co-Located (QCL) relationship if the large-scale property of a channel through which symbols are transmitted at one antenna port can be estimated from the channel through which symbols are transmitted at another antenna port. Here, the large-scale property may include the long-range properties of the channel. The large-scale property may include some or all of the delay spread, Doppler spread, Doppler shift, average gain, average delay, and spatial Rx parameters. A first antenna port and a second antenna port being QCL with respect to beam parameters means that the received beam assumed by the receiver for the first antenna port is the same (or corresponds) to the received beam assumed by the receiver for the second antenna port. The first and second antenna ports being QCL with respect to beam parameters means that the transmission beam assumed by the receiver for the first antenna port and the transmission beam assumed by the receiver for the second antenna port are identical (or correspond). Terminal device 1 may assume that the two antenna ports are QCL if the large-scale characteristics of the channel through which symbols are transmitted at one antenna port can be estimated from the channel through which symbols are transmitted at the other antenna port. The two antenna ports being QCL may also mean that it is assumed that the two antenna ports are QCL.

[0035] Carrier aggregation may involve communication using multiple aggregated serving cells. It may also involve communication using multiple aggregated component carriers. Furthermore, it may involve communication using multiple aggregated downlink component carriers. Finally, it may involve communication using multiple aggregated uplink component carriers.

[0036] The following describes an example of the configuration of a terminal device 1 according to one aspect of this embodiment.

[0037] Figure 3 is a schematic block diagram showing the configuration of a terminal device 1 according to one aspect of this embodiment. As shown in the figure, the terminal device 1 is composed of a wireless transceiver unit 10 and a higher layer processing unit 14. The wireless transceiver unit 10 is composed of at least part or all of an antenna unit 11, an RF (Radio Frequency) unit 12, and a baseband unit 13. The higher layer processing unit 14 is composed of at least part or all of a media access control layer processing unit 15 and a wireless resource control layer processing unit 16. The wireless transceiver unit 10 is also referred to as the transmitting unit, receiving unit, or physical layer processing unit.

[0038] The wireless transceiver unit 10 performs physical layer processing.

[0039] For example, the wireless transceiver 10 may generate the baseband signal for the uplink physical channel. Here, the transport blocks delivered from the upper layer on the UL-SCH may be located on the uplink physical channel. For example, the wireless transceiver 10 may generate the baseband signal for the uplink physical signal.

[0040] For example, the wireless transceiver 10 may attempt to detect information transmitted by the downlink physical channel. Here, the transport block of the information transmitted by the downlink physical channel may be delivered to the upper layer on the DL-SCH. For example, the physical layer processing unit 10 may attempt to detect information transmitted by the downlink physical signal.

[0041] The receiving unit of terminal device 1 receives the PDSCH. The receiving processing unit of terminal device 1 performs processing to receive the PDSCH in the downlink frequency band (cell, component carrier, carrier). The receiving processing unit of terminal device 1 performs demodulation, decoding, and other processing on the PDSCH.

[0042] The transmitting unit (also called the transmitting processing unit) of terminal device 1 transmits a HARQ-ACK. The transmitting processing unit of terminal device 1 transmits a HARQ-ACK to the PDSCH. The transmitting processing unit of terminal device 1 transmits a HARQ-ACK in the uplink frequency band (cell, component carrier, carrier).

[0043] The upper layer processing unit 14 outputs the uplink data (transport block) generated by user operations, etc., to the wireless transceiver unit 10. The upper layer processing unit 14 performs processing at the MAC layer, Packet Data Convergence Protocol (PDCP) layer, Radio Link Control (RLC) layer, and RRC layer.

[0044] The media access control layer processing unit (MAC layer processing unit) 15, which is part of the upper layer processing unit 14, performs MAC layer processing.

[0045] The radio resource control layer processing unit 16, located within the upper layer processing unit 14, performs RRC layer processing. The radio resource control layer processing unit 16 manages various setting information / parameters (RRC parameters) of its own device. The radio resource control layer processing unit 16 sets various setting information / parameters (RRC parameters) based on the upper layer signals received from the base station device 3. That is, the radio resource control layer processing unit 16 sets various setting information / parameters (RRC parameters) based on information indicating the various setting information / parameters (RRC parameters) received from the base station device 3. This setting information may include information related to the processing or setting of physical channels and physical signals (i.e., the physical layer), MAC layer, PDCP layer, RLC layer, and RRC layer. These parameters may also be upper layer parameters.

[0046] For example, the wireless resource control layer processing unit 16 may acquire RRC parameters contained in an RRC message on a certain logical channel and set the acquired RRC parameters in the memory area of ​​the terminal device 1. The RRC parameters set in the memory area of ​​the terminal device 1 may be provided to the lower layer.

[0047] The wireless resource control layer processing unit 16 may include function information generated based on the functions of the terminal device 1 in the RRC message and transmit it to the base station device 3.

[0048] The wireless transceiver 10 performs modulation processing, encoding processing, and transmission processing. The wireless transceiver 10 generates a physical signal by encoding processing, modulation processing, and baseband signal generation processing (conversion to a time-continuous signal) of the data (transport block), and transmits it to the base station device 3.

[0049] The wireless transceiver 10 performs demodulation, decoding, and reception processing. Based on the demodulation and decoding processing of the received physical signal, the wireless transceiver 10 outputs the transport block of the detected information to the upper layer processing unit 14 on the DL-SCH.

[0050] The RF unit 12 converts the signal received via the antenna unit 11 into a baseband signal (downconvert) and removes unwanted frequency components. The RF unit 12 outputs the baseband signal to the baseband unit 13.

[0051] The baseband section 13 converts the analog signal input from the RF section 12 into a digital signal. The baseband section 13 removes the portion corresponding to the Cyclic Prefix (CP) from the converted digital signal. The baseband section 13 performs a Fast Fourier Transform (FFT) on the signal from which the CP has been removed to extract the signal in the frequency domain.

[0052] The baseband unit 13 performs an inverse fast Fourier transform (IFFT) on the physical signal to generate an OFDM symbol. The baseband unit 13 adds a CP to the generated OFDM symbol to generate a baseband digital signal. The baseband unit 13 converts the baseband digital signal into an analog signal. The baseband unit 13 outputs the converted analog signal to the RF unit 12.

[0053] The RF unit 12 uses a low-pass filter to remove unwanted frequency components from the analog signal input from the baseband unit 13, upconverts the analog signal to the carrier frequency, and generates an RF signal. The RF unit 12 transmits the RF signal via the antenna unit 11. The RF unit 12 also amplifies power. The RF unit 12 may also have a function to control the transmission power. The RF unit 12 is also referred to as the transmission power control unit.

[0054] The following describes an example of the configuration of a base station device 3 according to one aspect of this embodiment.

[0055] Figure 4 is a schematic block diagram showing the configuration of a base station device 3 according to one aspect of this embodiment. As shown in the figure, the base station device 3 is composed of a wireless transceiver unit 30 and a higher layer processing unit 34. The wireless transceiver unit 30 is composed of an antenna unit 31, an RF (Radio Frequency) unit 32, and a baseband unit 33. The higher layer processing unit 34 is composed of a media access control layer processing unit 35 and a wireless resource control layer processing unit 36. The wireless transceiver unit 30 is also referred to as the transmitting unit, receiving unit, or physical layer processing unit.

[0056] The upper layer processing unit 34 performs processing for the MAC (Medium Access Control) layer, the Packet Data Convergence Protocol (PDCP) layer, the Radio Link Control (RLC) layer, and the Radio Resource Control (RRC) layer. Here, the MAC layer is also called the MAC sublayer. The PDCP layer is also called the PDCP sublayer. The RLC layer is also called the RLC sublayer. The RRC layer is also called the RRC sublayer.

[0057] The media access control layer processing unit 35, which is part of the upper layer processing unit 34, performs MAC layer processing. Here, MAC layer processing may include mapping between logical channels and transport channels, multiplexing of one or more MAC SDUs (Service Data Units) into transport blocks, decomposition of transport blocks delivered from the physical layer on the UL-SCH into one or more MAC SDUs, application of HARQ (Hybrid Automatic Repeat reQuest) to transport blocks, and some or all of the processing of scheduling requests.

[0058] The wireless resource control layer processing unit 36, located in the upper layer processing unit 34, performs RRC layer processing. RRC layer processing may include some or all of the following: management of broadcast signals, management of RRC connection / RRC idle status, and RRC reconfiguration. The wireless resource control layer processing unit 36 ​​generates or obtains downlink data (transport blocks), system information, RRC messages, MAC CE, etc., which are placed on the PDSCH, from the upper node, and outputs them to the wireless transceiver unit 30.

[0059] Furthermore, the wireless resource control layer processing unit 36 ​​manages various setting information / parameters (RRC parameters) for each terminal device 1. The wireless resource control layer processing unit 36 ​​may set various setting information / parameters for each terminal device 1 via signals from higher layers. That is, the wireless resource control layer processing unit 36 ​​transmits / announces information indicating various setting information / parameters. This setting information may include information related to the processing or setting of physical channels and physical signals (i.e., the physical layer), MAC layer, PDCP layer, RLC layer, and RRC layer. These parameters may also be higher layer parameters. For example, the wireless resource control layer processing unit 36 ​​may transmit RRC parameters to the terminal device 1 in an RRC message on a certain logical channel. Here, the RRC message may be mapped to BCCH (Broadcast Control Channel), CCCH (Common Control Channel), or DCCH (Dedicated Control Channel).

[0060] The wireless resource control layer processing unit 36 ​​may determine the RRC parameters to be transmitted to terminal device 1 based on the RRC parameters contained in the RRC message transmitted from terminal device 1. Here, the RRC message transmitted from terminal device 1 may be related to the functional information report of terminal device 1.

[0061] The wireless resource control layer processing unit 36 ​​sets resources for transmitting HARQ-ACK to terminal device 1. The wireless resource control layer processing unit 36 ​​sets resources for transmitting HARQ-ACK to PDSCH in the downlink frequency band (cell, component carrier, carrier). The wireless resource control layer processing unit 36 ​​sets resources for transmitting HARQ-ACK to PDSCH in the uplink frequency band (cell, component carrier, carrier).

[0062] The functions of the wireless transceiver 30 are the same as those of the wireless transceiver 10, so their explanation will be omitted as appropriate. The wireless transceiver 30 performs physical layer processing. Here, the physical layer processing may include some or all of the generation of baseband signals for physical channels, generation of baseband signals for physical signals, detection of information transmitted from physical channels, and detection of information transmitted by physical signals. The physical layer processing may also include mapping of transport channels to physical channels. Here, the baseband signal is also referred to as a time-continuous signal.

[0063] The wireless transceiver 30 may perform demodulation and / or decoding. The wireless transceiver 30 may deliver the transport block from the information detected based on the demodulation and decoding of the received physical signal to the upper layer on the UL-SCH. For example, the wireless transceiver 30 may generate the baseband signal of the downlink physical channel. Here, the transport block delivered from the upper layer on the DL-SCH may be placed on the downlink physical channel. For example, the wireless transceiver 30 may generate the baseband signal of the downlink physical signal.

[0064] The wireless transceiver 30 may perform some or all of the modulation, coding, and transmission processes. The wireless transceiver 30 may generate a physical signal based on some or all of the coding, modulation, and baseband signal generation processes for the transport block. The wireless transceiver 30 may place the physical signal on a BWP. The wireless transceiver 30 may transmit the generated physical signal. For example, the wireless transceiver 30 may attempt to detect information transmitted by the uplink physical channel. Here, the transport block of the information transmitted by the uplink physical channel may be delivered to a higher layer on the UL-SCH. For example, the wireless transceiver 30 may attempt to detect information transmitted by the uplink physical signal.

[0065] The receiving unit (also called the receiving processing unit) of base station device 3 receives HARQ-ACK. The receiving processing unit of base station device 3 receives HARQ-ACK for PDSCH. The receiving processing unit of base station device 3 receives HARQ-ACK in the uplink frequency band (cell, component carrier, carrier). The receiving processing unit of base station device 3 also receives HARQ-ACK for PDSCH in the downlink frequency band (cell, component carrier, carrier) managed by base station device 3.

[0066] The RF unit 32 may convert the signal received via the antenna unit 31 into a baseband signal and remove unwanted frequency components. The RF unit 32 outputs the baseband signal to the baseband unit 33.

[0067] The baseband section 33 may digitize the baseband signal input from the RF section 32. The baseband section 33 may remove the portion corresponding to the Cyclic Prefix (CP) from the digitized baseband signal. The baseband section 33 may perform a Fast Fourier Transform (FFT) on the baseband signal from which the CP has been removed to extract the signal in the frequency domain.

[0068] The baseband unit 33 may generate a baseband signal by performing an inverse fast Fourier transform (IFFT) on the physical signal. The baseband unit 33 may add a CP to the generated baseband signal. The baseband unit 33 may convert the baseband signal with the CP added into an analog. The baseband unit 33 may output the analogized baseband signal to the RF unit 32.

[0069] The RF unit 32 may remove extraneous frequency components from the baseband signal input from the baseband unit 33. The RF unit 32 may upconvert the baseband signal to the carrier frequency to generate an RF signal. The RF unit 32 may transmit the RF signal via the antenna unit 31. The RF unit 32 may also have a function to control the transmission power.

[0070] Each of the parts designated by reference numerals 10 to 16 in the terminal device 1 may be configured as a circuit. Each of the parts designated by reference numerals 30 to 36 in the base station device 3 may be configured as a circuit.

[0071] The following describes various aspects of the physical channels and physical signals (physical signals) according to this embodiment.

[0072] Physical signals are a collective term for downlink physical channels, downlink physical signals, uplink physical channels, and uplink physical channels. Physical channels are a collective term for downlink physical channels and uplink physical channels. Physical signals are a collective term for downlink physical signals and uplink physical signals.

[0073] An uplink physical channel may correspond to a set of resource elements that carry information generated in the upper layer. An uplink physical channel is a physical channel used in the uplink component carrier. An uplink physical channel may be transmitted by the wireless transceiver 10. An uplink physical channel may be received by the wireless transceiver 30. In a wireless communication system according to one aspect of this embodiment, at least some or all of the following uplink physical channels are used. ·PUCCH (Physical Uplink Control CHannel) ·PUSCH (Physical Uplink Shared CHannel) ·PRACH(Physical Random Access CHannel)

[0074] PUCCH may be used to transmit (transmit) Uplink Control Information (UCI). Uplink Control Information may be placed in PUCCH. The wireless transceiver 10 may transmit PUCCH containing Uplink Control Information. The physical layer processing unit 30 may receive PUCCH containing Uplink Control Information.

[0075] Uplink control information (uplink control information bits, uplink control information sequence, uplink control information type) includes some or all of the channel state information (CSI), scheduling request (SR), and HARQ-ACK (Hybrid Automatic Repeatrequest ACKnowledgement) information. Note that uplink control information may also include information not listed above.

[0076] Channel status information is also referred to as channel status information bits or channel status information sequences. Scheduling requests are also referred to as scheduling request bits or scheduling request sequences. HARQ-ACK information is also referred to as HARQ-ACK information bits or HARQ-ACK information sequences.

[0077] HARQ-ACK information may consist of HARQ-ACK bits corresponding to a single transport block (TB). HARQ-ACK bits may indicate an ACK (acknowledgement) or a NACK (negative-acknowledgement) corresponding to the transport block. An ACK may indicate that the transport block has been decoded successfully. A NACK may indicate that the transport block has not been decoded successfully. HARQ-ACK information may contain one or more HARQ-ACK bits.

[0078] HARQ-ACK for transport blocks is also referred to as HARQ-ACK for PDSCH. Here, "HARQ-ACK for PDSCH" may refer to HARQ-ACK for transport blocks included in PDSCH.

[0079] A scheduling request may be used to request UL-SCH resources for initial transmission. The scheduling request bit may be used to indicate either a positive SR or a negative SR. When the scheduling request bit indicates a positive SR, it is also referred to as "a positive SR is transmitted." A positive SR may indicate that terminal device 1 is requesting UL-SCH resources for initial transmission. When the scheduling request bit indicates a negative SR, it is also referred to as "a negative SR is transmitted." A negative SR may indicate that terminal device 1 is not requesting UL-SCH resources for initial transmission.

[0080] Channel status information may include some or all of the Channel Quality Indicator (CQI), Precoder Matrix Indicator (PMI), and Rank Indicator (RI). CQI is an indicator related to the quality of the propagation path (e.g., propagation strength) or the quality of the physical channel, PMI is an indicator related to the precoder, and RI is an indicator related to the transmit rank (or transmit layer number).

[0081] Channel status information is an indicator of the reception status of the physical signal (e.g., CSI-RS) used for channel measurement. The value of the channel status information may be determined by terminal device 1 based on the reception status assumed by the physical signal used for channel measurement. Channel measurement may include interference measurement.

[0082] PUCCH may be accompanied by a PUCCH format, where the PUCCH format may be the format of the physical layer processing of PUCCH, or it may be the format of the information transmitted using PUCCH.

[0083] A PUSCH may be transmitted to transmit uplink control information and / or a transport block. A PUSCH may be used to transmit uplink control information and / or a transport block. A PUSCH may be used to transmit at least a portion or all of a transport block, HARQ-ACK, channel status information, and scheduling request. A PUSCH may be used at least to transmit a random access message 3. A PUSCH may be used to transmit information not described above. Terminal device 1 may transmit a PUSCH containing uplink control information and / or a transport block. Base station device 3 may receive a PUSCH containing uplink control information and / or a transport block.

[0084] PRACH may be transmitted to convey the index of the random access preamble (random access message 1). Terminal device 1 may transmit PRACH. Base station device 3 may receive PRACH. Terminal device 1 may transmit the random access preamble over PRACH. Base station device 3 may receive the random access preamble over PRACH.

[0085] Uplink physical signals may correspond to a set of resource elements. Uplink physical signals do not have to be used to transmit information generated in the upper layer. However, uplink physical signals may be used to transmit information generated in the physical layer. Uplink physical signals may also be physical signals used in the uplink component carrier. Wireless transceiver 10 may transmit uplink physical signals. Wireless transceiver 30 may receive uplink physical signals. In the uplink of a wireless communication system according to one aspect of this embodiment, some or all of the following uplink physical signals may be used. ·UL DMRS(UpLink Demodulation Reference Signal) ·SRS(Sounding Reference Signal) ·UL PTRS(UpLink Phase Tracking Reference Signal)

[0086] UL DMRS is a general term for DMRS for PUSCH and DMRS for PUCCH.

[0087] The set of antenna ports for a DMRS for a PUSCH (DMRS associated with a PUSCH, DMRS included in a PUSCH, and DMRS corresponding to a PUSCH) may be given based on the set of antenna ports for the PUSCH. For example, the set of antenna ports for a DMRS for a PUSCH may be the same as the set of antenna ports for the PUSCH.

[0088] The propagation path of a pusher may be estimated from the DMRS for that pusher.

[0089] The set of antenna ports for DMRS for PUCCH (DMRS related to PUCCH, DMRS included in PUCCH, DMRS corresponding to PUCCH) may be the same as the set of antenna ports for PUCCH.

[0090] The propagation path of PUCCH may be estimated from the DMRS for the PUCCH.

[0091] A downlink physical channel may correspond to a set of resource elements that transmit information generated in the upper layer. A downlink physical channel may also be a physical channel used in a downlink component carrier. The wireless transceiver 30 may transmit a downlink physical channel. The wireless transceiver 10 may receive a downlink physical channel. In the downlink of a wireless communication system according to one aspect of this embodiment, some or all of the following downlink physical channels may be used. ·PBCH(Physical Broadcast Channel) ·PDCCH (Physical Downlink Control Channel) ·PDSCH(Physical Downlink Shared Channel)

[0092] PBCH is transmitted to transmit either or both a Master Information Block (MIB) and / or physical layer control information. Here, physical layer control information is information generated at the physical layer. MIB is an RRC message delivered from a higher layer over the BCCH (Broadcast Control Channel).

[0093] A PDCCH is used at least for transmitting Downlink Control Information (DCI). Downlink Control Information may be placed on the PDCCH. Terminal device 1 may receive a PDCCH containing Downlink Control Information. Base station device 3 may transmit a PDCCH containing Downlink Control Information.

[0094] Downlink control information may be transmitted in DCI format. The DCI format may be interpreted as the format of the downlink control information. Alternatively, the DCI format may be interpreted as a set of downlink control information set in a specific downlink control information format.

[0095] The base station device 3 may notify the terminal device 1 of downlink control information using a PDCCH with DCI format. Here, the terminal device 1 may monitor the PDCCH to obtain downlink control information. Unless otherwise specified, the DCI format and downlink control information may be described as equivalent. For example, the base station device 3 may transmit the downlink control information to the terminal device 1 in DCI format. Alternatively, the terminal device 1 may control the physical layer processing unit 10 using the downlink control information contained in the detected DCI format.

[0096] Downlink control information may include at least one of either a downlink grant (DL grant) or an uplink grant (UL grant). The DCI format used for scheduling PDSCH is also called the downlink DCI format. The DCI format used for scheduling PUSCH is also called the uplink DCI format. Downlink grants are also called downlink assignments (DL assignment) or downlink allocations (DL allocation).

[0097] DCI formats 0_0, 0_1, 1_0, and 1_1 are DCI formats. Uplink DCI formats are a general term for DCI formats 0_0 and 0_1. Downlink DCI formats are a general term for DCI formats 1_0 and 1_1.

[0098] DCI format 0_0 is used for scheduling PUSCHs to be placed in a cell. DCI format 0_0 consists of at least some or all of 1A through 1E. 1A) DCI format specific field (Identifier for DCI formats field) 1B) Frequency domain resource assignment field 1C) Time domain resource assignment field 1D) Frequency hopping flag field 1E) MCS field (Modulation and Coding Scheme field)

[0099] The DCI format identification field may indicate whether the DCI format containing the DCI format identification field is an uplink DCI format or a downlink DCI format. In other words, the DCI format identification field may be included in both the uplink DCI format and the downlink DCI format. Here, the DCI format identification field included in DCI format 0_0 may indicate 0.

[0100] The frequency domain resource allocation field included in DCI format 0_0 may be used to indicate the allocation of frequency resources for PUSCH scheduled by DCI format 0_0.

[0101] The time domain resource allocation field included in DCI format 0_0 may be used to indicate the allocation of time resources for a PUSCH scheduled by DCI format 0_0.

[0102] The frequency hopping flag field may be used to indicate whether frequency hopping is applied to a PUSCH scheduled using the DCI format 0_0.

[0103] The MCS field included in DCI format 0_0 may be used to indicate either or both the modulation scheme for the PUSCH scheduled by DCI format 0_0, and the target coding rate scheduled by DCI format 0_1. The target coding rate may be the target coding rate for the transport block to be placed in the PUSCH. The size of the transport block (TBS) to be placed in the PUSCH may be determined based on the target coding rate and some or all of the modulation scheme for the PUSCH.

[0104] DCI format 0_0 does not need to include fields used in CSI requests. DCI format 0_0 does not need to include carrier indicator fields. DCI format 0_0 does not need to include BWP fields.

[0105] DCI format 0_1 ​​is used for scheduling PUSCHs placed in a given cell. DCI format 0_1 ​​consists of some or all of the fields 2A through 2H. 2A) DCI Format Specific Fields 2B) Frequency Domain Resource Allocation Field 2C) Time Domain Resource Allocation Field 2D) Frequency Hopping Flag Field 2E) MCS Field 2F) CSI request field 2G) BWP field 2H) UL DAI field (downlink assignment index)

[0106] The DCI format specific field included in DCI format 0_1 ​​may indicate 0.

[0107] The frequency domain resource allocation field included in DCI format 0_1 ​​may be used to indicate the allocation of frequency resources for PUSCH scheduled by DCI format 0_1.

[0108] The time domain resource allocation field included in DCI format 0_1 ​​may be used to indicate the allocation of time resources for PUSCH scheduled by DCI format 0_1.

[0109] The MCS field included in DCI format 0_1 ​​may be used to indicate either or both the modulation scheme for the PUSCH scheduled by DCI format 0_1, and the target coding rate for the PUSCH scheduled by DCI format 0_1.

[0110] The CSI request field may be used to instruct the reporting of a CSI.

[0111] The BWP field of DCI format 0_1 ​​may be used to indicate the uplink BWP on which the PUSCH scheduled by DCI format 0_1 ​​is located. In other words, DCI format 0_1 ​​may or may not involve a change in the active uplink BWP. Terminal device 1 may recognize the uplink BWP on which the PUSCH is located based on detecting the DCI format 0_1 ​​used for scheduling the PUSCH.

[0112] A DCI format 0_1 ​​that does not include a BWP field may be a DCI format that schedules a PUSCH without changing the active uplink BWP. Terminal device 1 may recognize that it will transmit the PUSCH without switching the active uplink BWP based on detecting a DCI format 0_1 ​​that is used for scheduling a PUSCH and does not include a BWP field.

[0113] If DCI format 0_1 ​​includes a BWP field, but terminal device 1 does not support the BWP switching function according to DCI format 0_1, the BWP field may be ignored by terminal device 1. In other words, terminal device 1, which does not support the BWP switching function, may recognize that it is a DCI format 0_1 ​​used for scheduling PUSCH and that includes a BWP field, and therefore transmit the PUSCH without switching the active uplink BWP. If the BWP switching function is supported, the radio resource control layer processing unit 16 may include functional information in the RRC message indicating that the BWP switching function is supported.

[0114] If DCI format 0_1 ​​includes a carrier indicator field, the carrier indicator field may be used to indicate the serving cell of the uplink component carrier on which PUSCH is located. Terminal device 1 may, based on detecting DCI format 0_1 ​​on the downlink component carrier of a serving cell, recognize that PUSCH scheduled by DCI format 0_1 ​​is located on the uplink component carrier of the serving cell indicated by the carrier indicator field included in DCI format 0_1.

[0115] If DCI format 0_1 ​​does not include a carrier indicator field, the serving cell to which the uplink component carrier on which a PUSCH scheduled by DCI format 0_1 ​​is located belongs may be the same as the serving cell of the downlink component carrier on which a PDCCH containing DCI format 0_1 ​​is located. Terminal device 1 may recognize that a PUSCH scheduled by DCI format 0_1 ​​is located on the uplink component carrier of a serving cell based on the detection of DCI format 0_1 ​​on a downlink component carrier of that serving cell.

[0116] The UL DAI field is used to indicate the transmission status of the PDSCH. If a Dynamic HARQ-ACK codebook is used, the size of the UL DAI field may be 2 bits. The UL DAI field indicates the size of the HARQ-ACK codebook transmitted by the PUSCH. The UL DAI field indicates the number of HARQ-ACKs included in the HARQ-ACK codebook transmitted by the PUSCH. The UL DAI field indicates the number of PDSCHs in which the corresponding HARQ-ACKs are included in the HARQ-ACK codebook transmitted by the PUSCH. The UL DAI field indicates the number of PDSCHs and SPS releases in which the corresponding HARQ-ACKs are included in the HARQ-ACK codebook transmitted by the PUSCH.

[0117] The UL DAI field may indicate the value after applying modulo arithmetic. An example of a 2-bit UL DAI field is described below. If the HARQ-ACK codebook sent via PUSCH contains 0 PDSCHs with corresponding HARQ-ACKs, the UL DAI field will be "00". If the HARQ-ACK codebook sent via PUSCH contains 1 PDSCH with corresponding HARQ-ACKs, the UL DAI field will be "01". If the HARQ-ACK codebook sent via PUSCH contains 2 PDSCHs with corresponding HARQ-ACKs, the UL DAI field will be "10". If the HARQ-ACK codebook sent via PUSCH contains 3 PDSCHs with corresponding HARQ-ACKs, the UL DAI field will be "11". If the HARQ-ACK codebook sent via PUSCH contains 4 PDSCHs with corresponding HARQ-ACKs, the UL DAI field will be set to "00". If the HARQ-ACK codebook sent via PUSCH contains 5 PDSCHs with corresponding HARQ-ACKs, the UL DAI field will be set to "01". If the HARQ-ACK codebook sent via PUSCH contains 6 PDSCHs with corresponding HARQ-ACKs, the UL DAI field will be set to "10". If the HARQ-ACK codebook sent via PUSCH contains 7 PDSCHs with corresponding HARQ-ACKs, the UL DAI field will be set to "11". In this example, a modulo operation using the number '4' is performed on the number of PDSCHs that contain corresponding HARQ-ACKs in the HARQ-ACK codebook sent via PUSCH.

[0118] Terminal device 1 interprets the UL DAI field considering the total number of PDSCHs received. For example, if terminal device 1 receives 4 PDSCHs and receives a UL DAI field indicating "00", terminal device 1 interprets that there are 4 PDSCHs whose HARQ-ACKs are included in the HARQ-ACK codebook transmitted via PUSCH, as indicated by the UL DAI field. For example, if terminal device 1 receives 3 PDSCHs and receives a UL DAI field indicating "00", terminal device 1 interprets that there are 4 PDSCHs whose HARQ-ACKs are included in the HARQ-ACK codebook transmitted via PUSCH, as indicated by the UL DAI field, and determines that it missed receiving one PDSCH.

[0119] DCI format 1_0 is used for scheduling PDSCHs located in a given cell. DCI format 1_0 consists of some or all of 3A through 3F. 3A) DCI Format Specific Fields 3B) Frequency Domain Resource Allocation Field 3C) Time Domain Resource Allocation Field 3D) MCS Field 3E) PDSCH to HARQ feedback timing indicator field 3F) PUCCH resource indicator field

[0120] The DCI format specific field included in DCI format 1_0 may indicate 1.

[0121] The frequency domain resource allocation field included in DCI format 1_0 may be used to indicate the allocation of frequency resources for PDSCHs scheduled by the DCI format.

[0122] The time domain resource allocation field included in DCI format 1_0 may be used to indicate the allocation of time resources for PDSCH scheduled by the DCI format.

[0123] The MCS field included in DCI format 1_0 may be used to indicate either or both the modulation scheme for the PDSCH scheduled by the DCI format, and / or the target coding rate for the PDSCH scheduled by the DCI format. The target coding rate may be the target coding rate for the transport block to be placed in the PDSCH. The size of the transport block (TBS) to be placed in the PDSCH may be determined based on either or both the target coding rate and / or the modulation scheme for the PDSCH.

[0124] The PDSCH_HARQ feedback timing instruction field may be used to indicate an offset from the slot containing the last OFDM symbol of the PDSCH to the slot containing the first OFDM symbol of the PUCCH. The timing instruction field from the PDSCH to the HARQ feedback may be a field indicating timing K1. If the index of the slot containing the last OFDM symbol of the PDSCH is slot n, the index of the slot containing the PUCCH or PUSCH that contains at least the HARQ-ACK corresponding to the transport block contained in the PDSCH may be n+K1. If the index of the slot containing the last OFDM symbol of the PDSCH is slot n, the index of the slot containing the first OFDM symbol of the PUCCH or the first OFDM symbol of the PUSCH that contains at least the HARQ-ACK corresponding to the transport block contained in the PDSCH may be n+K1.

[0125] The PDSCH_HARQ feedback timing indicator field may also be referred to as the PDSCH-to-HARQ feedback timing indicator field or the HARQ indicator field.

[0126] The PUCCH resource instruction field may be used to indicate a PUCCH resource.

[0127] DCI format 1_0 does not have to include a carrier indicator field. In other words, the downlink component carrier on which a PDSCH scheduled by DCI format 1_0 is located may be the same as the downlink component carrier on which a PDCCH containing DCI format 1_0 is located. Terminal device 1 may recognize that a PDSCH scheduled by DCI format 1_0 is located on a downlink component carrier based on the detection of DCI format 1_0 on that downlink component carrier.

[0128] DCI format 1_0 does not necessarily have to include a BWP field. Here, DCI format 1_0 may be a DCI format that schedules a PDSCH without changing the active downlink BWP. Terminal device 1 may recognize that it will receive the PDSCH without switching the active downlink BWP based on detecting DCI format 1_0 used for scheduling the PDSCH.

[0129] DCI format 1_1 is used for scheduling PDSCHs located in a given cell. DCI format 1_1 consists of some or all of 4A through 4I. 4A) DCI Format Specific Fields 4B) Frequency Domain Resource Allocation Field 4C) Time Domain Resource Allocation Field 4E) MCS Field 4F) PDSCH_HARQ Feedback Timing Indicator Field 4G)PUCCH resource instruction field 4H) BWP Field 4I) Carrier Indicator Field

[0130] The DCI format specific field included in DCI format 1_1 may indicate 1.

[0131] The frequency domain resource allocation field included in DCI format 1_1 may be used to indicate the allocation of frequency resources for PDSCHs scheduled by DCI format 1_1.

[0132] The time domain resource allocation field included in DCI format 1_1 may be used to indicate the allocation of time resources for PDSCH scheduled by DCI format 1_1.

[0133] The MCS field included in DCI format 1_1 may be used to indicate either or both the modulation scheme for the PDSCH scheduled by DCI format 1_1, and the target coding rate for the PDSCH scheduled by DCI format 1_1.

[0134] If DCI format 1_1 includes a PDSCH_HARQ feedback timing indicator field, this field may be used to indicate the offset from the slot containing the last OFDM symbol of the PDSCH to the slot containing the first OFDM symbol of the PUCCH. If DCI format 1_1 does not include a PDSCH_HARQ feedback timing indicator field, the parameter indicating the offset from the slot containing the last OFDM symbol of the PDSCH to the slot containing the first OFDM symbol of the PUCCH may be provided by the RRC layer.

[0135] The PUCCH resource instruction field may be used to indicate a PUCCH resource.

[0136] The BWP field of DCI format 1_1 may be used to indicate the downlink BWP on which the PDSCH scheduled by DCI format 1_1 is located. In other words, DCI format 1_1 may or may not involve a change in the active downlink BWP. Terminal device 1 may recognize the downlink BWP on which the PDSCH is located based on detecting the DCI format 1_1 used for scheduling the PDSCH.

[0137] A DCI format 1_1 that does not include a BWP field may be a DCI format that schedules a PDSCH without changing the active downlink BWP. The terminal device 1 may recognize that it will receive a PDSCH without switching the active downlink BWP based on detecting a DCI format 1_1 that is used for scheduling a PDSCH and does not include a BWP field.

[0138] If DCI format 1_1 includes a BWP field, but terminal device 1 does not support the BWP switching function according to DCI format 1_1, the BWP field may be ignored by terminal device 1. In other words, terminal device 1, which does not support the BWP switching function, may recognize that it will receive the PDSCH without switching the active downlink BWP based on the detection of DCI format 1_1 used for scheduling the PDSCH and which includes a BWP field. If the BWP switching function is supported, the radio resource control layer processing unit 16 may include function information in the RRC message indicating that the BWP switching function is supported.

[0139] If DCI format 1_1 includes a carrier indicator field, the carrier indicator field may be used to indicate the serving cell of the downlink component carrier where the PDSCH scheduled by DCI format 1_1 is located. Terminal device 1 may recognize, based on detecting DCI format 1_1 in the downlink component carrier of a serving cell, that the PDSCH scheduled by DCI format 1_1 is located in the downlink component carrier of the serving cell indicated by the carrier indicator field included in DCI format 1_1.

[0140] If DCI format 1_1 does not include a carrier indicator field, the downlink component carrier on which a PDSCH scheduled by DCI format 1_1 is located may be the same as the downlink component carrier on which a PDCCH containing DCI format 1_1 is located. Terminal device 1 may recognize that a PDSCH scheduled by DCI format 1_1 is located on a downlink component carrier based on detecting DCI format 1_1 on that downlink component carrier.

[0141] A downlink grant is used for scheduling at least one PDSCH within a serving cell. A downlink grant is used for scheduling at least one PDSCH in the same slot from which the downlink grant was sent. A downlink grant may be used for scheduling a PDSCH in a different slot from the one from which the downlink grant was sent. An uplink grant is used for scheduling at least one PUSCH within a serving cell.

[0142] Furthermore, various DCI formats may include additional fields different from those described above. These may include a field indicating the cumulative number of PDCCHs transmitted (C-DAI: Counter Downlink Assignment Index field), or a field indicating the total number of PDCCHs transmitted (T-DAI: Total Downlink Assignment Index field).

[0143] A PDSCH may be transmitted to transmit a transport block. A PDSCH may be used to transmit a transport block. A transport block may be placed on a PDSCH. Base station device 3 may transmit a PDSCH on which a transport block is placed. Terminal device 1 may receive a PDSCH on which a transport block is placed.

[0144] Downlink physical signals may correspond to a set of resource elements. Downlink physical signals do not have to be used to transmit information generated in the upper layer. However, downlink physical signals may be used to transmit information generated in the physical layer. Downlink physical signals may also be physical signals used in the downlink component carrier. Wireless transceiver 10 may receive downlink physical signals. Wireless transceiver 30 may transmit downlink physical signals. In the downlink of a wireless communication system according to one aspect of this embodiment, at least some or all of the following downlink physical signals may be used. ·Synchronization signal (SS) ·DL DMRS(DownLink DeModulation Reference Signal) ·CSI-RS(Channel State Information-Reference Signal) ·DL PTRS(DownLink Phase Tracking Reference Signal)

[0145] The synchronization signal is used by terminal device 1 to synchronize the downlink in the frequency domain and / or time domain. The synchronization signal is a general term for PSS (Primary Synchronization Signal) and SSS (Secondary Synchronization Signal).

[0146] An SS block (SS / PBCH block) consists of at least some or all of PSS, SSS, and PBCH.

[0147] The antenna ports for PSS, SSS, PBCH, and DMRS for PBCH may be the same.

[0148] The PBCH whose symbol is transmitted at a given antenna port may be estimated by a DMRS for the PBCH located in the slot to which the PBCH is mapped, and which is included in the SS / PBCH block containing the PBCH.

[0149] DL DMRS is a general term for DMRS for PBCH, DMRS for PDSCH, and DMRS for PDCCH.

[0150] The set of antenna ports for a DMRS for a PDSCH (DMRS associated with a PDSCH, DMRS included in a PDSCH, and DMRS corresponding to a PDSCH) may be given based on the set of antenna ports for the PDSCH. For example, the set of antenna ports for a DMRS for a PDSCH may be the same as the set of antenna ports for the PDSCH.

[0151] The propagation path of a PDSCH may be estimated from the DMRS for that PDSCH. If the set of resource elements on which a PDSCH symbol is transmitted and the set of resource elements on which the DMRS symbol for that PDSCH is transmitted belong to the same Precoding Resource Group (PRG), then the PDSCH on which the PDSCH symbol is transmitted at a given antenna port may be estimated from the DMRS for that PDSCH.

[0152] The antenna port for the DMRS for PDCCH (DMRS associated with PDCCH, DMRS included in PDCCH, DMRS corresponding to PDCCH) may be the same as the antenna port for PDCCH.

[0153] The propagation path of a PDCCH may be inferred from the DMRS for that PDCCH. If the same precoder is applied (or assumed to be applied) to the set of resource elements on which the symbol of a PDCCH is transmitted and to the set of resource elements on which the symbol of the DMRS for that PDCCH is transmitted, then the PDCCH on which the symbol of that PDCCH is transmitted at a given antenna port may be inferred from the DMRS for that PDCCH.

[0154] BCH (Broadcast Channel), UL-SCH (Uplink-Shared Channel), and DL-SCH (Downlink-Shared Channel) are transport channels.

[0155] The BCH in the transport layer may be mapped to the PBCH in the physical layer. That is, transport blocks delivered from higher layers on the BCH in the transport layer may be placed on the PBCH in the physical layer. Also, the UL-SCH in the transport layer may be mapped to the PUSCH in the physical layer.

[0156] The transport layer may apply HARQ (Hybrid Automatic Repeat reQuest) to the transport block.

[0157] BCCH (Broadcast Control Channel), CCCH (Common Control Channel), and DCCH (Dedicated Control Channel) are logical channels. For example, BCCH may be used to deliver RRC messages containing MIBs or system information. CCCH may be used to transmit RRC messages containing common RRC parameters to multiple terminal devices 1. Here, CCCH may be used, for example, for terminal devices 1 that are not RRC connected. DCCH may be used to transmit RRC messages dedicated to a particular terminal device 1. Here, DCCH may be used, for example, for terminal devices 1 that are RRC connected.

[0158] BCCH may be mapped to BCH or DL-SCH. That is, RRC messages containing MIB information may be delivered to BCH. Also, RRC messages containing system information other than MIB may be delivered to DL-SCH. CCCH is mapped to DL-SCH or UL-SCH. That is, RRC messages mapped to CCCH may be delivered to DL-SCH or UL-SCH. Also, DCCH may be mapped to DL-SCH or UL-SCH. That is, RRC messages mapped to DCCH may be delivered to DL-SCH or UL-SCH.

[0159] UL-SCH may be mapped to PUSCH. DL-SCH may be mapped to PDSCH. BCH may be mapped to PBCH.

[0160] The media access control layer processing unit 15 may perform a random access procedure.

[0161] For example, downlink control information, including downlink grants or uplink grants, is transmitted and received via the PDCCH, including the C-RNTI (Cell-Radio Network Temporary Identifier).

[0162] A single physical channel may be mapped to a single serving cell. A single physical channel may also be mapped to a single BWP configured on a single carrier contained within a single serving cell.

[0163] Terminal device 1 may have one or more control resource sets (CORESET) configured. Terminal device 1 monitors the PDCCH in one or more control resource sets. Here, monitoring the PDCCH in one or more control resource sets may include monitoring one or more PDCCHs corresponding to each of the one or more control resource sets. Note that a PDCCH may include one or more PDCCH candidates and / or a set of PDCCH candidates. Furthermore, monitoring the PDCCH may include monitoring and detecting the PDCCH and / or the DCI format transmitted through the PDCCH.

[0164] Multiple control resource sets may be configured in terminal device 1, and each control resource set may be assigned an index (control resource set index). One or more control channel elements (CCEs) may be configured within a control resource set, and each CCE may be assigned an index (CCE index).

[0165] The set of PDCCH candidates monitored by terminal device 1 is defined in terms of the search space. In other words, the set of PDCCH candidates monitored by terminal device 1 is given by the search space.

[0166] The search region may consist of one or more PDCCH candidates at one or more aggregation levels. The aggregation level of a PDCCH candidate may indicate the number of CCEs that make up the PDCCH. A PDDCH candidate may be mapped to one or more CCEs.

[0167] A set of search regions may consist of at least one or more search regions. Each search region may be assigned an index (search region index).

[0168] Each of the search area sets may be associated with at least one control resource set. Each of the search area sets may be contained within one control resource set. Each of the search area sets may be given an index of the control resource set associated with that search area set.

[0169] Terminal device 1 can detect PDCCH and / or DCI for itself by blindly detecting PDCCH candidates included in the search area within the control resource set.

[0170] In various embodiments of this embodiment, unless otherwise specified, the number of resource blocks indicates the number of resource blocks in the frequency domain.

[0171] Terminal device 1 transmits uplink control information (UCI) to base station device 3. Terminal device 1 may multiplex the UCI into PUCCH and transmit it. Terminal device 1 may multiplex the UCI into PUSCH and transmit it. The UCI may include at least one of the following: downlink channel state information (CSI), scheduling request (SR) indicating a request for PUSCH resources, and HARQ-ACK (Hybrid Automatic Repeat request ACKnowledgement) for downlink data (Transport block, Medium Access Control Protocol Data Unit: MAC PDU, Downlink-Shared Channel: DL-SCH, Physical Downlink Shared Channel: PDSCH).

[0172] HARQ-ACK may also be referred to as ACK / NACK, HARQ feedback, HARQ-ACK feedback, HARQ response, HARQ-ACK response, HARQ information, HARQ-ACK information, HARQ control information, and HARQ-ACK control information.

[0173] If downlink data is successfully decoded, an ACK is generated for the downlink data. If downlink data is not successfully decoded, a NACK is generated for the downlink data. A HARQ-ACK may include at least HARQ-ACK bits corresponding to at least one transport block. HARQ-ACK bits may indicate an ACK (ACKnowledgement) or a NACK (Negative-ACKnowledgement) corresponding to one or more transport blocks. A HARQ-ACK may include at least a HARQ-ACK codebook containing one or more HARQ-ACK bits. HARQ-ACK bits corresponding to one or more transport blocks may correspond to a PDSCH containing the one or more transport blocks.

[0174] HARQ control over a single transport block may be called a HARQ process. Each HARQ process may be assigned a unique HARQ process identifier. The DCI format includes a field indicating the HARQ process identifier (HARQ process number).

[0175] Each HARQ process has an NDI (New Data Indicator) indicated in DCI format. For example, the DCI format (DL assignment) containing the scheduling information of a PDSCH includes an NDI field. The NDI field is 1 bit. Terminal device 1 stores (remembers) the NDI value for each HARQ process. Base station device 3 stores (remembers) the NDI value for each HARQ process for each terminal device 1. Terminal device 1 updates the stored NDI value using the detected NDI field in DCI format. Base station device 3 sets the updated NDI value, or the NDI value that has not been updated, in the NDI field in DCI format and transmits it to terminal device 1. Terminal device 1 updates the stored NDI value using the detected NDI field in DCI format for the HARQ process corresponding to the value of the detected HARQ process identifier field in DCI format.

[0176] Terminal device 1 determines whether a received transport block is a new transmission or a retransmission based on the value of the NDI field in the DCI format (DL assignment). Terminal device 1 compares the value of the NDI field in the DCI format that was previously received for a transport block of a certain HARQ process, and if the value of the NDI field in the DCI format that was previously toggled, it determines that the received transport block is a new transmission. When base station device 3 transmits a transport block as a new transmission in a certain HARQ process, it toggles the value of the NDI stored for that HARQ process and sends the toggled NDI to terminal device 1. When base station device 3 transmits a transport block as a retransmission in a certain HARQ process, it does not toggle the value of the NDI stored for that HARQ process and sends the untoggled NDI to terminal device 1. When terminal device 1 compares the value of the NDI field in the DCI format that was previously received for a transport block of a certain HARQ process, it determines that the received transport block is a retransmission if the value of the NDI field in the DCI format that was previously received is not toggled (they are the same). Note that "toggle" here means switching to a different value.

[0177] Terminal device 1 may report HARQ-ACK information to base station device 3 using a HARQ-ACK codebook in a slot indicated by the value of the HARQ instruction field included in DCI format 1_0 or DCI format 1_1 that corresponds to PDSCH reception.

[0178] For DCI format 1_0, the value of the HARQ instruction field may be mapped to a set of slot numbers (1, 2, 3, 4, 5, 6, 7, 8). For DCI format 1_1, the value of the HARQ instruction field may be mapped to a set of slot numbers given by the upper layer parameter dl-DataToUL-ACK. The number of slots indicated, at least based on the value of the HARQ instruction field, may also be called the HARQ-ACK timing or K1. For example, a HARQ-ACK representing the decoded state of PDSCH (downlink data) transmitted in slot n may be reported (transmitted) in slot n+K1.

[0179] dl-DataToUL-ACK represents a list of HARQ-ACK timings for a PDSCH. Timing is the number of slots between the slot in which the PDSCH was received (or the slot containing the last OFDM symbol to which the PDSCH is mapped) and the slot in which the HARQ-ACK for the received PDSCH is sent. For example, dl-DataToUL-ACK is a list of 1, 2, 3, 4, 5, 6, 7, or 8 timings. If Dl-DataToUL-ACK is a list of 1 timing, the HARQ indicator field is 0 bits. If Dl-DataToUL-ACK is a list of 2 timings, the HARQ indicator field is 1 bit. If Dl-DataToUL-ACK is a list of 3 or 4 timings, the HARQ indicator field is 2 bits. If Dl-DataToUL-ACK is a list of 5, 6, 7, or 8 timings, the HARQ indicator field is 3 bits. For example, dl-DataToUL-ACK consists of a list of timings with values ​​ranging from 0 to 31. For example, dl-DataToUL-ACK consists of a list of timings with values ​​ranging from 0 to 63.

[0180] The size of dl-DataToUL-ACK is defined as the number of elements that dl-DataToUL-ACK contains. The size of Dl-DataToUL-ACK is L para It may also be called this. The index of Dl-DataToUL-ACK indicates the order (number) of the elements of dl-DataToUL-ACK. For example, if the size of dl-DataToUL-ACK is 8 (L para If =8, the index of dl-DataToUL-ACK is one of the values ​​1, 2, 3, 4, 5, 6, 7, or 8. The index of Dl-DataToUL-ACK may be given, indicated, or indicated by the value indicated by the HARQ indicator field.

[0181] Terminal device 1 may set the size of the HARQ-ACK codebook according to the size of dl-DataToUL-ACK. For example, if dl-DataToUL-ACK consists of 8 elements, the size of the HARQ-ACK codebook is 8. For example, if dl-DataToUL-ACK consists of 2 elements, the size of the HARQ-ACK codebook is 2. Each HARQ-ACK piece of information constituting the HARQ-ACK codebook is HARQ-ACK information for PDSCH reception at each slot timing of dl-DataToUL-ACK. This type of HARQ-ACK codebook is also called a semi-static HARQ-ACK codebook.

[0182] Terminal device 1 may report HARQ-ACK information for PDSCH reception in slot n using PUCCH transmission and / or PUSCH transmission in slot n+k. Here, k may be the number of slots indicated by the HARQ indicator field included in the DCI format corresponding to the PDSCH reception. If the HARQ indicator field is not included in the DCI format, k may be given by the upper-layer parameter dl-DataToUL-ACK.

[0183] Terminal device 1 determines a set of multiple opportunities for one or more candidate PDSCH receptions to transmit corresponding HARQ-ACK information at a PUCCH in a given slot. Terminal device 1 determines that multiple slots of slot timing K1 included in dl-DataToUL-ACK are multiple opportunities for candidate PDSCH receptions. K1 may be a set of k. For example, if dl-DataToUL-ACK is (1, 2, 3, 4, 5, 6, 7, 8), then at the PUCCH of slot n, HARQ-ACK information is transmitted for PDSCH receptions in slots n-1, n-2, n-3, n-4, n-5, n-6, n-7, and n-8. If terminal device 1 actually receives a PDSCH in the slot corresponding to candidate PDSCH reception, it sets ACK or NACK as HARQ-ACK information based on the transport block contained in that PDSCH. If it does not receive a PDSCH in the slot corresponding to candidate PDSCH reception, it sets NACK as HARQ-ACK information.

[0184] The HARQ-ACK codebook may be based on at least a set of monitoring occasions for PDCCH, some or all of the values ​​in the counter DAI field, the HARQ-ACK codebook may be based on the value in the UL DAI field, the HARQ-ACK codebook may be based on the value in the DAI field, or the HARQ-ACK codebook may be based on the value in the total DAI field.

[0185] The size of the HARQ-ACK codebook may be set based on the value of the counter DAI field in the last received DCI format. The counter DAI field indicates the cumulative number of scheduled PDSCHs or transport blocks up to the receipt of the corresponding DCI format. The size of the HARQ-ACK codebook may also be set based on the value of the total DAI field in the DCI format. The total DAI field indicates the total number of scheduled PDSCHs or transport blocks up to the transmission of the HARQ-ACK codebook.

[0186] Terminal device 1 may determine a set of PDCCH monitoring opportunities for HARQ-ACK information transmitted in a PUCCH located in slot #n of index n, based at least some or all of the value of timing K1 and slot offset K0. The set of PDCCH monitoring opportunities for HARQ-ACK information transmitted in a PUCCH located in slot #n of index n is also referred to as the set of PDCCH monitoring opportunities for slot #n. Here, the set of PDCCH monitoring opportunities includes M PDCCH monitoring opportunities. For example, slot offset K0 may be indicated based at least on the value of the time-domain resource allocation field included in the downlink DCI format. Slot offset K0 is a value indicating the number of slots (slot difference) from the slot containing the last OFDM symbol in which a PDCCH containing a DCI format containing the time-domain resource allocation field indicating the slot offset K0 is located, to the first OFDM symbol of the PDCCH scheduled by the DCI format.

[0187] If a DCI format detected during a monitoring opportunity in any search area set corresponding to a monitoring opportunity for a certain PDCCH triggers the transmission of HARQ-ACK information in slot n (including the triggering information), terminal device 1 may determine that the PDCCH monitoring opportunity is a PDCCH monitoring opportunity for slot n. Conversely, if a DCI format detected during a monitoring opportunity in a search area set corresponding to a PDCCH monitoring opportunity does not trigger the transmission of HARQ-ACK information in slot n (does not include the triggering information), terminal device 1 does not have to determine that the PDCCH monitoring opportunity is a PDCCH monitoring opportunity for slot n. Furthermore, if no DCI format is detected during a monitoring opportunity in a search area set corresponding to a PDCCH monitoring opportunity, terminal device 1 does not have to determine that the PDCCH monitoring opportunity is a PDCCH monitoring opportunity for slot n.

[0188] The Counter DAI (Counter DAI) indicates the cumulative number of PDCCHs detected up to the monitoring opportunity for a given PDCCH in a given serving cell, across M PDCCH monitoring opportunities. The Counter DAI may also be referred to as the C-DAI. The C-DAI corresponding to a PDSCH may be indicated by a field included in the DCI format used for scheduling the PDSCH. The Total DAI may indicate the cumulative number of PDCCHs detected up to monitoring opportunity m of a PDCCH across M PDCCH monitoring opportunities. The Total DAI may also be referred to as the T-DAI (Total Downlink Assignment Index).

[0189] This document describes the switching process for the uplink frequency band (uplink cell) for transmitting HARQ-ACK information in one embodiment of the present invention.

[0190] Terminal device 1 communicates simultaneously with base station device 3A (third base station device), base station device 3B (first base station device), and base station device 3C (second base station device). At a certain time, terminal device 1 uses the downlink frequency band and the uplink frequency band for communication (connection) with base station device 3A, terminal device 1 uses the downlink frequency band and the uplink frequency band for communication (connection) with base station device 3B, and terminal device 1 uses only the downlink frequency band for communication (connection) with base station device 3C. In other words, terminal device 1 uses the downlink cell (downlink cell 1) and the uplink cell (uplink cell 1) for communication (connection) with base station device 3A, terminal device 1 uses the downlink cell (downlink cell 2) and the uplink cell (uplink cell 2) for communication (connection) with base station device 3B, and terminal device 1 uses only the downlink cell (downlink cell 3) for communication (connection) with base station device 3C.

[0191] At a given time, base station device 3A uses both the downlink and uplink frequency bands for communication (connection) with terminal device 1, base station device 3B uses both the downlink and uplink frequency bands for communication (connection) with terminal device 1, and base station device 3C uses only the downlink frequency band for communication (connection) with terminal device 1. In other words, base station device 3A uses the downlink cell (downlink cell 1) and the uplink cell (uplink cell 1) for communication (connection) with terminal device 1, base station device 3B uses the downlink cell (downlink cell 2) and the uplink cell (uplink cell 2) for communication (connection) with terminal device 1, and base station device 3C uses only the downlink cell (downlink cell 3) for communication (connection) with terminal device 1.

[0192] Terminal device 1 transmits HARQ-ACK information for transport blocks included in PDSCH received in the downlink frequency band used with base station device 3A in the uplink frequency band used with base station device 3A. Terminal device 1 transmits HARQ-ACK information for transport blocks included in PDSCH received in cell 1 of the downlink used with base station device 3A in cell 1 of the uplink used with base station device 3A. Terminal device 1 transmits HARQ-ACK information for transport blocks included in PDSCH received in the downlink frequency band used with base station device 3B in the uplink frequency band used with base station device 3B. Terminal device 1 transmits HARQ-ACK information for transport blocks included in PDSCH received in cell 2 of the downlink used with base station device 3B in cell 2 of the uplink used with base station device 3B. The transmission of HARQ-ACK information used here is performed using the method of transmitting HARQ-ACK information described above. For example, methods using dynamic or quasi-static HARQ-ACK codebooks that utilize various fields within the DCI format are employed.

[0193] Base station device 3A receives HARQ-ACK information for transport blocks included in PDSCH transmitted in the downlink frequency band used with terminal device 1 in the uplink frequency band used with terminal device 1. Base station device 3A receives HARQ-ACK information for transport blocks included in PDSCH transmitted in cell 1 of the downlink used with terminal device 1 in cell 1 of the uplink used with terminal device 1. Base station device 3B receives HARQ-ACK information for transport blocks included in PDSCH transmitted in the downlink frequency band used with terminal device 1 in the uplink frequency band used with terminal device 1. Base station device 3B receives HARQ-ACK information for transport blocks included in PDSCH transmitted in cell 2 of the downlink used with terminal device 1 in cell 2 of the uplink used with terminal device 1.

[0194] Terminal device 1 is allocated resources used to transmit a signal to notify base station device 3 of the switching of the uplink frequency band (uplink cell). A random access preamble is used as this signal, and the resources of the random access preamble (index of the random access preamble, time position of PRACH (period and offset), frequency position of PRACH) are allocated to terminal device 1. Here, terminal device 1 is allocated resources (resources within uplink cell 2) used to transmit a signal to base station device 3B to notify it of the switching of the uplink frequency band (uplink cell). Note that the signal to notify base station device 3 of the switching of the uplink frequency band (uplink cell) may be a dedicated PUCCH signal.

[0195] Base station device 3 allocates resources for a random access preamble used to notify terminal device 1 that it will switch uplink frequency bands (uplink cells). Base station device 1 notifies terminal device 1 of this allocation information using RRC parameters (RRC signaling). Here, base station device 3B pre-allocates resources for a random access preamble used by terminal device 1 to notify terminal device 1 that it will switch uplink frequency bands (uplink cells), and notifies terminal device 1 of this allocation information using RRC parameters (RRC signaling).

[0196] The base station device 3B may transmit information to the terminal device 1 indicating that it has detected the random access preamble. Based on receiving the information from the base station device 3B indicating that it has detected the random access preamble, the terminal device 1 may initiate the process of switching the uplink cell to the base station device 3C. If PUCCH is used as a signal to notify the base station device 3B of the switching of the uplink frequency band (uplink cell), the terminal device 1 may initiate the process of switching the uplink cell to the base station device 3C based on receiving information from the base station device 3B indicating that it has detected the PUCCH. The information indicating that the random access preamble has been detected, or the information indicating that the PUCCH has been detected, may be transmitted using PDSCH or PDCCH.

[0197] If terminal device 1 detects an error in the transport block included in the PDSCH received in the downlink frequency band (downlink cell 3) used with base station device 3C, it transmits the assigned random access preamble to base station device 3B. Terminal device 1 then deactivates the uplink frequency band (uplink cell 2) that was used with base station device 3B and changes its settings to use the uplink frequency band (uplink cell 3) with base station device 3C. In other words, terminal device 1 switches the uplink cell in the SCG. Terminal device 1 switches the SCG that sets the uplink cell. Terminal device 1 switches the base station device 3 that sets the uplink cell in the SCG.

[0198] When base station device 3B detects the random access preamble, it releases the uplink frequency band (uplink cell 2) set for terminal device 1.

[0199] Terminal device 1 is allocated resources for a random access preamble to be transmitted to base station device 3C during uplink cell switching. If terminal device 1 detects an error in the transport block included in the PDSCH received in the downlink frequency band (downlink cell 3) used with base station device 3C, it transmits a random access preamble to base station device 3C.

[0200] Base station device 3C allocates resources of the random access preamble, which terminal device 1 uses to switch uplink cells and notify HARQ-ACK information, to terminal device 1, and notifies terminal device 1 of this allocation information using RRC parameters (RRC signaling).

[0201] Upon detecting the random access preamble, base station device 3C transmits a random access response to terminal device 1. The random access response includes information indicating the uplink resources. Terminal device 1 receives the random access response and uses the resources indicated in the random access response to transmit HARQ-ACK information to base station device 3C for the PDSCH transport block of the downlink cell (downlink cell 3) managed by base station device 3C. The resources indicated in the random access response are PUSCH resources.

[0202] The HARQ-ACK information may be indicated by the HARQ process number used in the PDSCH containing the transport block in which the error was detected. Terminal device 1 transmits information indicating the HARQ process number used in the PDSCH containing the transport block in which the error was detected to base station device 3C using the resources indicated in the random access response.

[0203] Based on the HARQ-ACK information received from terminal device 1, base station device 3C retransmits the PDSCH containing the erroneous transport block to terminal device 1. Base station device 3C determines from the HARQ process number indicated in the HARQ-ACK information transmitted by terminal device 1 that an error has been detected in the transport block of the PDSCH corresponding to that HARQ process number.

[0204] Subsequently, terminal device 1 transmits HARQ-ACK information for transport blocks included in the PDSCH received in the downlink frequency band (downlink cell 3) used with base station device 3C using the method described above with the dynamic HARQ-ACK codebook or the quasi-static HARQ-ACK codebook. If terminal device 1 detects an error in the transport block included in the PDSCH received in the downlink frequency band (downlink cell 3) used with base station device 3B, it transmits the assigned random access preamble to base station device 3C. Similarly, resources (resources within uplink cell 3) used to transmit a signal to notify base station device 3C of the switch to the uplink frequency band (uplink cell) are allocated to terminal device 1 by base station device 3C. Terminal device 1 then releases the uplink frequency band (uplink cell 3) that was used with base station device 3C and changes its settings to use the uplink frequency band (uplink cell 2) with base station device 3B.

[0205] Terminal device 1 is allocated resources for a random access preamble to be transmitted to base station device 3B during uplink cell switching. If terminal device 1 detects an error in the transport block included in the PDSCH received in the downlink frequency band (downlink cell 2) used between terminal device 1 and base station device 3B, it transmits a random access preamble to base station device 3B.

[0206] Upon detecting the random access preamble, base station device 3B transmits a random access response to terminal device 1. The random access response includes information indicating the uplink resources. Terminal device 1 receives the random access response and uses the resources indicated in the random access response to transmit HARQ-ACK information to base station device 3B for the transport block of the PDSCH of the downlink cell (downlink cell 2) managed by base station device 3B.

[0207] Here, in the case of downlink cells of base station device 3 where no uplink cells are configured in terminal device 1, it is preferable to use conservative scheduling. For cells where HARQ-ACK information is exchanged using a dynamic HARQ-ACK codebook or a quasi-static HARQ-ACK codebook, it is preferable to use scheduling that increases redundancy by lowering the modulation level and coding rate, thereby reducing the occurrence of errors. For the case of downlink cells of base station device 3 where an uplink cell is configured in terminal device 1, it is preferable to use scheduling that uses adaptive modulation without increasing redundancy.

[0208] Transmit power control in one embodiment of the present invention will be described. When terminal device 1 transmits HARQ-ACK information to base station device 3 using the uplink resources indicated in the random access response, terminal device 1 determines the transmit power of PUSCH using at least a parameter indicating the target power level at the receiving end of the random access preamble and a parameter indicating the power offset between the random access preamble and PUSCH containing the HARQ-ACK information. When terminal device 1 transmits message 3 instead of HARQ-ACK information to base station device 3 using the uplink resources indicated in the random access response, terminal device 1 determines the transmit power of PUSCH using at least a parameter indicating the target power level at the receiving end of the random access preamble and a parameter indicating the power offset between the random access preamble and PUSCH containing message 3. Here, the parameter indicating the power offset between the random access preamble and PUSCH containing HARQ-ACK information and the parameter indicating the power offset between the random access preamble and PUSCH containing message 3 are different parameters. When sending a PUSCH message using a resource indicated in a random access response, different parameters are used for transmit power control depending on whether or not HARQ-ACK information is included.

[0209] For setting the transmit power for a PUSCH containing HARQ-ACK information, parameters based on the number of resource blocks assigned to the PUSCH, parameters based on downlink path loss, and parameters based on transmit power control commands may be used in combination. For example, terminal device 1 may set the transmit power based on a value calculated by summing the value of a parameter indicating the target power level at the receiving end of the random access preamble, the value of a parameter indicating the power offset between the random access preamble and the PUSCH containing HARQ-ACK information, the value of a parameter based on the number of resource blocks assigned to the PUSCH, the value of a parameter based on downlink path loss, and the value of a parameter based on transmit power control commands.

[0210] When terminal device 1 transmits the HARQ-ACK information to base station device 3 using the uplink resources indicated in the random access response, in addition to the parameter indicating the power offset between the random access preamble and the PUSCH containing message 3, a parameter indicating the power offset between the random access preamble and the PUSCH containing the HARQ-ACK information may also be used.

[0211] The wireless resource control layer processing unit 16 of terminal device 1 manages RRC parameters related to transmit power control. The wireless resource control layer processing unit 16 of terminal device 1 manages parameters such as a parameter indicating the target power level at the receiving end of the random access preamble, a parameter indicating the power offset between the random access preamble and the PUSCH containing HARQ-ACK information, and a parameter indicating the power offset between the random access preamble and the PUSCH containing message 3. The wireless transceiver unit 10 of terminal device 1 receives information indicating these RRC parameters from the base station device 3. The wireless transceiver unit 10 of terminal device 1 receives information indicating these RRC parameters through RRC signaling and system information. The RRC parameters extracted from the information received by the wireless transceiver unit 10 are input to the wireless resource control layer processing unit 16 and managed. The wireless transceiver unit 10 sets the value of the transmit power using these RRC parameters, etc., and transmits a signal using the set transmit power.

[0212] Figure 5 shows an example of the process for setting parameters related to the transmission power of terminal device 1 according to one aspect of this embodiment. For the sake of simplicity, explanations regarding the setting of parameters other than the parameter indicating the power offset between the random access preamble and PUSCH containing HARQ-ACK information, and the parameter indicating the power offset between the random access preamble and PUSCH containing message 3 are omitted. The wireless transceiver 10 of terminal device 1 detects a random access response (step S101). Here, the detected random access response is a random access response to the random access preamble transmitted by terminal device 1.

[0213] The wireless transceiver unit 10 of terminal device 1 determines whether or not to transmit HARQ-ACK information using the resource indicated in the random access response (step S102). If the wireless transceiver unit 10 of terminal device 1 detects a random access response corresponding to a random access preamble that was transmitted to switch uplink cells and transmit HARQ-ACK information, it determines to transmit HARQ-ACK information using the resource indicated in the random access response. If the wireless transceiver unit 10 of terminal device 1 detects a random access response corresponding to a random access preamble different from the random access preamble that was transmitted to switch uplink cells and transmit HARQ-ACK information, it determines not to transmit HARQ-ACK information using the resource indicated in the random access response. For example, the wireless transceiver unit 10 of terminal device 1 transmits a random access preamble when notifying base station device 3 of a scheduling request or when re-establishing an RRC connection.

[0214] If the wireless transceiver 10 of terminal device 1 determines to transmit HARQ-ACK information using the resource indicated in the random access response (step S102: YES), it uses a parameter indicating the power offset between the random access preamble and the PUSCH containing the HARQ-ACK information (step S103). If the wireless transceiver 10 of terminal device 1 determines not to transmit HARQ-ACK information using the resource indicated in the random access response (step S102: NO), that is, if it determines to transmit message 3 using the resource indicated in the random access response, it uses a parameter indicating the power offset between the random access preamble and the PUSCH containing message 3 (step S104). The wireless transceiver 10 of terminal device 1 uses this parameter to set the transmission power of the PUSCH and transmits.

[0215] Furthermore, if terminal device 1 is a PUSCH that uses the uplink resources indicated in the random access response, and sets the transmission power for the PUSCH containing HARQ-ACK information using a parameter indicating the power offset between the random access preamble and the PUSCH containing message 3, in addition to a parameter indicating the power offset between the random access preamble and the PUSCH containing HARQ-ACK information, then in step S103, the wireless transceiver 10 of terminal device 1 uses the parameter indicating the power offset between the random access preamble and the PUSCH containing message 3, and the parameter indicating the power offset between the random access preamble and the PUSCH containing HARQ-ACK information.

[0216] As described above, one aspect of the present invention enables the appropriate exchange of HARQ-ACK information between a terminal device 1 and a base station device 3. The terminal device 1 can use transmission power suitable for transmitting HARQ-ACK information with the resources indicated in the random access response. The base station device 3, upon receiving HARQ-ACK information, can appropriately control data retransmission. By achieving appropriate retransmission control, efficient communication is achieved.

[0217] The programs that operate in the base station device 3 and terminal device 1 according to one aspect of the present invention may be programs that control the CPU (Central Processing Unit) and the like (programs that make the computer function) in order to realize the functions of the above embodiment according to one aspect of the present invention. The information handled by these devices is temporarily stored in RAM (Random Access Memory) during processing, and then stored in various ROMs such as Flash ROM (Read Only Memory) or HDD (Hard Disk Drive), and read, modified, and written by the CPU as needed.

[0218] Furthermore, the terminal device 1 and a part of the base station device 3 in the above-described embodiment may be implemented using a computer. In that case, the program for implementing this control function may be recorded on a computer-readable recording medium, and the program recorded on this recording medium may be read by a computer system and executed.

[0219] Furthermore, the term "computer system" as used herein refers to the computer system built into terminal device 1 or base station device 3, and includes hardware such as the OS and peripheral devices. In addition, "computer-readable recording medium" refers to portable media such as flexible disks, magneto-optical disks, ROMs, CD-ROMs, and storage devices such as hard disks built into computer systems.

[0220] Furthermore, "computer-readable recording media" may include those that dynamically hold programs for a short period of time, such as communication lines used when transmitting programs via networks such as the Internet or communication lines such as telephone lines, as well as those that hold programs for a certain period of time, such as volatile memory within a computer system that acts as a server or client in such cases. In addition, the above-mentioned program may be for the purpose of realizing some of the functions described above, and may also be a program that can realize the above-mentioned functions in combination with a program already recorded in the computer system.

[0221] Terminal device 1 may consist of at least one processor and at least one memory containing computer program instructions (computer program). The memory and computer program instructions (computer program) may be configured to cause terminal device 1 to perform the operations and processing described in the above embodiment using the processor. Base station device 3 may consist of at least one processor and at least one memory containing computer program instructions (computer program). The memory and computer program instructions (computer program) may be configured to cause base station device 3 to perform the operations and processing described in the above embodiment using the processor.

[0222] Furthermore, the base station device 3 in the above-described embodiment can also be realized as an assembly (device group) composed of multiple devices. Each device constituting the device group may have some or all of the functions or functional blocks of the base station device 3 related to the above-described embodiment. The device group only needs to have a complete set of the functions or functional blocks of the base station device 3. In addition, the terminal device 1 related to the above-described embodiment can also communicate with the base station device as an assembly.

[0223] Furthermore, the base station device 3 in the above-described embodiment may be EUTRAN (Evolved Universal Terrestrial Radio Access Network) and / or NG-RAN (NextGen RAN, NR RAN). Also, the base station device 3 in the above-described embodiment may have some or all of the functions of a higher-level node for eNodeB and / or gNB.

[0224] Furthermore, some or all of the terminal device 1 and base station device 3 in the above-described embodiment may be implemented as LSIs, which are typically integrated circuits, or as a chipset. Each functional block of the terminal device 1 and base station device 3 may be individually chipped, or some or all of them may be integrated into a chip. In addition, the method of implementing the integrated circuit is not limited to LSIs; it may also be implemented using dedicated circuits or general-purpose processors. Moreover, if an integrated circuit technology that can replace LSIs emerges due to advances in semiconductor technology, it is also possible to use an integrated circuit based on that technology.

[0225] Furthermore, although the above-described embodiment mentions a terminal device as an example of a communication device, the present invention is not limited to this and can also be applied to stationary or non-movable electronic devices installed indoors or outdoors, such as terminal devices or communication devices for AV equipment, kitchen equipment, cleaning and washing machines, air conditioning equipment, office equipment, vending machines, and other household appliances.

[0226] While embodiments of this invention have been described in detail above with reference to the drawings, the specific configuration is not limited to these embodiments, and design modifications and the like that do not depart from the gist of this invention are also included. Furthermore, various modifications are possible within the scope of the claims for one aspect of the present invention, and embodiments obtained by appropriately combining the technical means disclosed in different embodiments are also included in the technical scope of the present invention. In addition, configurations in which elements described in each of the above embodiments that produce similar effects are substituted for each other are also included. [Industrial applicability]

[0227] One aspect of the present invention can be used, for example, in communication systems, communication equipment (e.g., mobile phone devices, base station devices, wireless LAN devices, or sensor devices), integrated circuits (e.g., communication chips), or programs. [Explanation of symbols]

[0228] 1 (1A, 1B, 1C) Terminal device 3(3A, 3B, 3C) Base station equipment 10, 30 Wireless Transceiver Unit 11, 31 Antenna section 12, 32 RF section 13, 33 Baseband section 14, 34 Upper Layer Processing Unit 15, 35 Media Access Control Layer Processing Unit 16, 36 Wireless Resource Control Layer Processing Unit

Claims

1. A terminal device comprising a processor and memory for storing computer program code, wherein when HARQ-ACK information is transmitted via PUSCH using uplink resources indicated in a random access response, the terminal device performs an operation that includes determining the transmission power of PUSCH using at least a parameter indicating the target power level at the receiving end of the random access preamble and a parameter indicating the power offset between the random access preamble and PUSCH containing the HARQ-ACK information.

2. The terminal device according to claim 1, which performs an operation that includes determining the transmission power of a PUSCH using at least a parameter indicating the target power level at the receiving end of the random access preamble and a parameter indicating the power offset between the random access preamble and the PUSCH containing message 3, when transmitting message 3 via PUSCH using the uplink resources indicated in the random access response.

3. A communication method used in a terminal device, wherein when HARQ-ACK information is transmitted via PUSCH using uplink resources indicated in a random access response, the method includes the step of determining the transmission power of PUSCH using at least a parameter indicating the target power level at the receiving end of the random access preamble and a parameter indicating the power offset between the random access preamble and PUSCH containing the HARQ-ACK information.

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