Terminal device, base station device, and communication method

Abstract

To provide a terminal device for efficiently receiving control information, a communication method used for the terminal device, a base station device for efficiently transmitting control information, and a communication method used for the base station device in multi-carrier operation for simultaneously performing communication by using a plurality of different frequency bands.SOLUTION: A method configures one search area from among a plurality of search areas according to the number of activated cells, monitors a PDCCH in the configured search area, and configures a DCI format including scheduling information for data of a different number of cells with respect to different search areas.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a terminal device, a base station device, and a communication method. [Background technology]

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

[0003] 3GPP is currently studying and standardizing the next-generation standard (NR: New Radio) as the communication method for 5G. NR is expected 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 technology framework.

[0004] In communications between a base station device and a terminal device, an extension of multi-carrier operation that uses multiple different frequency bands for simultaneous communications is being considered (Non-Patent Document 1). In order to reduce the overhead of control information while ensuring flexibility in data scheduling, data for multiple cells is scheduled using one piece of scheduling control information. Methods for this are being considered. [Prior art documents] [Non-patent literature]

[0005] [Non-Patent Document 1] "Title: New WID Multi-carrier enhancements", RP-213577, NTT DOCOMO, INC. 3GPP TSG RAN Meeting #94e, Dec.6-17, 2021 Summary of the Invention [Problem to be solved by the invention]

[0006] A terminal device needs to perform blind decoding on a received signal to detect control information transmitted from a base station device. Increasing the number of blind decodings performed within a certain unit processing time leads to an increase in the processing load of the terminal device. One aspect of the present invention provides a terminal device that efficiently receives control information, a communication method used in the terminal device, a base station device that efficiently transmits control information, and a communication method used in the base station device. [Means for solving the problem]

[0007] (1) A first aspect of the present invention is a terminal device including a processor and a memory for storing computer program code, the terminal device including: setting one search area from a plurality of search areas according to the number of activated cells; and monitoring a PDCCH in the set search area.

[0033] The present invention performs the actions including:

[0008] (2) Furthermore, a DCI format is set separately for each of the plurality of search areas. can be.

[0009] (3) Furthermore, the DCI format is for scheduling data for multiple cells. Contains information.

[0010] (4) Furthermore, the DCI format including scheduling information for data of different numbers of cells is set for different search areas.

[0011] (5) A second aspect of the present invention is a communication method used in a terminal device, comprising the steps of: setting one search area from a plurality of search areas according to the number of activated cells; and monitoring a PDCCH in the set search area.

[0012] (6) Furthermore, a DCI format is set separately for each of the plurality of search areas. can be.

[0013] (7) Furthermore, the DCI format may include a scheduling for data of multiple cells. Contains information.

[0014] (8) Furthermore, the DCI format including scheduling information for data of different numbers of cells is set for different search areas.

[0015] (9) A third aspect of the present invention is a base station device comprising a processor and a memory for storing computer program code, which sets one search area from a plurality of search areas for a terminal device 1 according to the number of activated cells, and transmits a PDCCH using PDCCH candidates included in the set search area.

[0016] (10) Furthermore, a DCI format is set separately for each of the plurality of search areas. will be done.

[0017] (11) Furthermore, the DCI format may include a scheduling for data of multiple cells. Contains logging information.

[0018] (12) Furthermore, the DCI format including scheduling information for data of different numbers of cells is set for different search areas.

[0019] (13) A fourth aspect of the present invention is a communication method used in a base station device, comprising the steps of: setting one search area from a plurality of search areas to a terminal device 1 according to the number of activated cells; and transmitting a PDCCH using PDCCH candidates included in the set search area.

[0020] (14) Furthermore, a DCI format is set separately for each of the plurality of search areas. will be done.

[0021] (15) Furthermore, the DCI format may include scheduling for data of multiple cells. Contains logging information.

[0022] (16) Furthermore, the DCI format including scheduling information for data of different numbers of cells is set for different search areas.

[0023] (17) A fifth aspect of the present invention is a terminal device comprising a processor and a memory for storing computer program code, and performing operations including: setting one DCI format from a plurality of DCI formats according to the number of activated cells; and monitoring a PDCCH using the set DCI format.

[0024] (18) A sixth aspect of the present invention is a communication method used in a terminal device, comprising: Set one of the DCI formats according to the number of activated cells. and monitoring the PDCCH using the configured DCI format.

[0025] (19) A seventh aspect of the present invention is a base station device comprising a processor and a memory for storing computer program code, which sets one DCI format from a plurality of DCI formats to a terminal device 1 according to the number of activated cells, and transmits a PDCCH using the set DCI format.

[0026] (20) An eighth aspect of the present invention is a communication method used in a base station device, comprising the steps of: setting one DCI format from a plurality of DCI formats for a terminal device 1 according to the number of activated cells; and transmitting a PDCCH using the set DCI format. [Effects of the Invention]

[0027] According to the present invention, a terminal device can efficiently receive control information, and a base station device can efficiently transmit control information. [Brief explanation of the drawings]

[0028] [Figure 1] 1 is a conceptual diagram of a wireless communication system according to an aspect of the present embodiment. [Figure 2] FIG. 2 is a schematic diagram illustrating an example of a resource grid in a subframe according to an aspect of the present embodiment. [Figure 3] 1 is a schematic block diagram showing a configuration of a terminal device 1 according to an aspect of the present embodiment. [Figure 4] FIG. 2 is a schematic block diagram illustrating a configuration of a base station device 3 according to one aspect of the present embodiment. [Figure 5] FIG. 10 is a diagram illustrating an example of a process of switching a multi-cell DCI format in accordance with the number of activated cells of a terminal device 1 according to an aspect of the present embodiment. [Figure 6] FIG. 10 is a diagram illustrating an example of a process of switching search areas according to the number of activated cells of a terminal device 1 according to an aspect of the present embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0029] Hereinafter, an embodiment of the present invention will be described.

[0030] "A and / or B" may be a term that includes "A", "B", or "A and B".

[0031] A parameter or information indicating one or more values ​​may mean that the parameter or information includes at least a 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) including multiple parameters.

[0032] FIG. 1 is a conceptual diagram of a wireless communication system according to one aspect of the present embodiment. In FIG. 1, the wireless communication system includes terminal devices 1A to 1C and a base station device 3 (gNB). Hereinafter, the terminal devices 1A to 1C are also referred to as terminal devices 1 (UE).

[0033] The base station device 3 is a MCG (Master Cell Group) and an SCG (Secondary Cell Group). The MCG may be configured to include one or both of the above. The MCG is a group of serving cells configured to include at least a PCell (Primary Cell). The SCG is a group of serving cells configured to include at least a PSCell (Primary Secondary Cell). The PCell is a cell on which an initial connection establishment procedure or a connection re-establishment procedure is performed by the terminal device 1 (the cell on which the procedure has been performed). The 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. The serving cell identity is a short identifier for identifying the serving cell. The serving cell identity may be provided by a higher layer parameter.

[0034] Serving cell groups (cell groups) are MCG, SCG, and PUCCH cell groups. A serving cell group may include one or more serving cells (or component carriers). The one or more serving cells (or component carriers) included in a serving cell group may be operated by carrier aggregation.

[0035] The base station device 3 communicates with the terminal device 1 using different frequency bands (carrier frequencies, frequency spectrums). This operation (multi-carrier operation) may be referred to as carrier aggregation or dual connectivity. Different cells (serving cells) use different frequency bands. In the base station device 3 and the terminal device 1, of the multiple cells used in carrier aggregation, one cell may use the downlink frequency band and the uplink frequency band, and the other cells may use only the downlink frequency band, or the other cells may also use the downlink frequency band and the uplink frequency band. The terminal device 1 makes an initial connection with the base station device 3, and after the connection with the base station device 3 is established, multiple cell connections are added. A frequency band used for communication is added to the terminal device 1. A cell (serving cell) used for communication is added to the terminal device 1. A connection with the base station device 3 is added to the terminal device 1.

[0036] 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 Multiplexing) may be used in the downlink of the wireless communication system. Furthermore, either CP-OFDM or DFT-s-OFDM (Discrete Fourier Transform-spread-Orthogonal Frequency Division Multiplexing) may be used in the uplink of the wireless communication system. Here, DFT-s-OFDM is a communication method in which modified precoding is applied prior to signal generation in CP-OFDM. Here, modified precoding is also referred to as DFT precoding.

[0037] As shown in Figure 1, the base station device 3 may be configured with one transceiver device (or transmission point, transmission device, reception point, reception device, transmission / reception point). On the other hand, in some cases, the base station device 3 may be configured to include multiple transceivers devices. When the base station device 3 is configured with multiple transceivers devices, each of the multiple transceivers devices may be located in a different geographical location.

[0038] The subcarrier spacing (SCS: SubCarrier Spacing) Δf for a certain subcarrier spacing setting μ is Δf=2 μ For example, the subcarrier spacing setting μ may indicate any of 0, 1, 2, 3, and 4.

[0039] Time unit T c =1 / (Δf max ×N f ) may be used to represent the length in the time domain, where Δf max = 480 kHz. f = 4096. The constant κ may be expressed as κ = Δf max ×N f / (Δf ref N f,r ef )=64. Also, Δf ref may be 15 kHz. f,re f is 2048.

[0040] The transmission of downlink / uplink signals may be organized into radio frames (system frames, frames) of length Tf, where Tf=(Δfmax×Nf / 100)×Ts=10 ms.

[0041] A radio frame may include 10 subframes, where the length of the subframes may be Tsf = (Δfmax × Nf / 1000) × Ts = 1 ms, and the number of OFDM symbols per subframe may be Nsubframe, μsymb = Nslotsymb × Nsubframe, μslot.

[0042] An OFDM symbol is used as a time domain unit of a communication method used in a wireless communication system. For example, an OFDM symbol may be used as a time domain unit of CP-OFDM. , an OFDM symbol may be used as a time domain unit of DFT-s-OFDM.

[0043] A slot may be configured to include multiple OFDM symbols. For example, one slot may be configured by Nslotsymb consecutive OFDM symbols. For example, in a normal CP setting, Nslotsymb=14 may be used. Also, in an extended CP setting, Nslotsymb=12 may be used.

[0044] Slots may be indexed in the time domain, e.g., the slot index nμs is an ascending integer value ranging from 0 to Nsubframe,μslot-1 in subframes. The slot index nμs,f may be given in order in a radio frame. It may be given in ascending order as integer values ​​ranging from 0 to Nframe, μslot-1.

[0045] Fig. 2 is a diagram showing an example of the configuration of a resource grid according to one aspect of this embodiment. In the resource grid of Fig. 2, the horizontal axis represents the OFDM symbol index lsym, and the vertical axis represents the subcarrier index ksc. The resource grid of Fig. 2 includes Nsize, μgrid, x × NRBsc subcarriers and Nsubframe, μsymb OFDM symbols. Here, Nsize, μgrid, and x represent the bandwidth of the SCS-specific carrier. The values ​​of Nsize, μgrid, and x are expressed in resource blocks.

[0046] Within the resource grid, the subcarrier index ksc and the OFDM symbol index The resource identified by the lsym is a ResourceElement (RE). It is also called.

[0047] A resource block (RB) contains NRBsc consecutive subcarriers. Resource blocks are divided into common resource blocks, physical resource blocks (PRBs), and virtual resource blocks (VRBs). For example, NRBsc=12.

[0048] A BandWidth Part (BWP) may be configured as a subset of the resource grid. Here, the BWP set for the downlink is also called a downlink BWP, and the BWP set for the uplink is also called an uplink BWP.

[0049] 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. Furthermore, a symbol may correspond to a modulation symbol arranged in a resource element. Here, "channel" may mean "propagation path." Furthermore, "channel" may mean "physical channel."

[0050] Two antenna ports are considered to be in a quasi-co-located (QCL) relationship when the large-scale properties of a 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. Here, the large-scale properties may include long-range channel properties. The large-scale properties may include some or all of delay spread, Doppler spread, Doppler shift, average gain, average delay, and beam parameters (spatial Rx parameters). The first and second antenna ports being QCL with respect to beam parameters may mean that the receive beam assumed by the receiver for the first antenna port is the same as (or corresponds to) the receive beam assumed by the receiver for the second antenna port. The first antenna port and the second antenna port being QCLs in terms of beam parameters may mean that a transmission beam assumed by the receiving side for the first antenna port and a transmission beam assumed by the receiving side for the second antenna port are the same (or correspond to each other). The terminal device 1 may assume that the two antenna ports are QCLs if the large-scale characteristics 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. The two antenna ports being QCLs may mean that the two antenna ports are assumed to be QCLs.

[0051] Carrier aggregation is the process of providing multiple aggregated serving The carrier aggregation may be performed by using a cell. The carrier aggregation may be performed by using a plurality of aggregated component carriers. The carrier aggregation may be performed by using a plurality of aggregated downlink component carriers. The carrier aggregation may be performed by using a plurality of aggregated uplink component carriers.

[0052] An example of the configuration of the terminal device 1 according to one aspect of this embodiment will be described below.

[0053] 3 is a schematic block diagram showing the configuration of a terminal device 1 according to one aspect of the present embodiment. As shown in the figure, the terminal device 1 includes a radio transmission / reception unit 10 and an upper layer processing unit 14. The radio transmission / reception unit 10 includes an antenna unit 11, an RF (Radio Frequency) unit 12, and The radio transceiver 10 is configured to include at least a part or all of a baseband unit 13 and a medium access control layer processing unit 15 and a part or all of a radio resource control layer processing unit 16. The radio transceiver 10 is also referred to as a transmitter, a receiver, or a physical layer processing unit.

[0054] The wireless transceiver 10 performs physical layer processing.

[0055] For example, the radio transceiver 10 may generate a baseband signal of an uplink physical channel. Here, a transport block delivered from a higher layer on the UL-SCH may be mapped to the uplink physical channel. For example, the radio transceiver 10 may generate a baseband signal of an uplink physical signal.

[0056] For example, the radio transceiver 10 may attempt to detect information transmitted by a downlink physical channel. Here, a transport block of the information transmitted by the downlink physical channel may be delivered to a higher layer on a DL-SCH. For example, the physical layer processor 10 may attempt to detect information transmitted by a downlink physical signal.

[0057] The receiving unit of the terminal device 1 receives the PDCCH. Processes receiving PDCCH in frequency band (cell, component carrier, carrier) The reception processing unit of the terminal device 1 performs processing such as demodulation and decoding on the PDCCH. The reception processing unit performs a process of receiving the PDCCH and a process of detecting the downlink control information. cormorant.

[0058] The receiving unit of the terminal device 1 receives the PDSCH. Processes receiving PDSCH in frequency band (cell, component carrier, carrier) The reception processing unit of the terminal device 1 performs processes such as demodulation and decoding on the PDSCH.

[0059] The transmission unit (also referred to as a transmission processing unit) of the terminal device 1 transmits a HARQ-ACK. The transmission processing unit of the terminal device 1 transmits a HARQ-ACK for a PDSCH. HARQ-ACK is transmitted in the link frequency band (cell, component carrier, carrier).

[0060] The upper layer processing unit 14 outputs uplink data (transport block) generated by user operation or the like to the radio transmitting and receiving unit 10. The upper layer processing unit 14 processes data from the MAC layer, packet Packet Data Convergence Protocol (PDCP) layer, wireless link It processes the control (RLC: Radio Link Control) layer and the RRC layer.

[0061] A medium access control layer processing unit (MAC layer processing unit) 15 included in the upper layer processing unit 14 performs processing of the MAC layer.

[0062] The radio resource control layer processing unit 16 included in the upper layer processing unit 14 performs processing for the RRC layer. The RRC layer processing unit 16 processes various setting information / parameters (RRC parameters) of the own device. The radio resource control layer processing unit 16 sets various setting information / parameters (RRC parameters) based on the signals of the higher layer received from the base station device 3. The line 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. The setting information may include information related to processing or setting of a physical channel or physical signal (i.e., a physical layer), a MAC layer, a PDCP layer, an RLC layer, and an RRC layer. The parameters may be upper layer parameters.

[0063] For example, the radio resource control layer processing unit 16 may receive an RRC message on a certain logical channel. and set the acquired RRC parameters in a storage area of ​​the terminal device 1. The RRC parameters set in the storage area of ​​the terminal device 1 may be provided to a lower layer.

[0064] The radio resource control layer processing unit 16 performs the RRC signaling based on the RRC signaling received from the base station device 3. The radio resource control layer processing unit 16 sets a control resource set in the control resource set. The radio resource control layer processing unit 16 sets (configures) a search space in the control resource set. The radio resource control layer processing unit 16 sets (configures) PDCCH candidates to be monitored in the control resource set. The radio resource control layer processing unit 16 sets (configures) the number of PDCCH candidates to be monitored in the control resource set. The radio resource control processing unit 16 sets (configures) an aggregation level of the PDCCH candidates to be monitored in the control resource set.

[0065] The radio resource control layer processing unit 16 determines the DCI format monitored in the control resource set. The radio resource control layer processing unit 16 sets the DCI phase monitored within the search area. The radio resource control layer processing unit 16 may set a DCI format to be monitored in the control resource set based on RRC signaling indicated from the base station device 3. The radio resource control layer processing unit 16 may set a DCI format to be monitored in the search space based on RRC signaling indicated from the base station device 3. The radio resource control layer processing unit 16 sets one or more DCI formats to be monitored in the reception processing unit.

[0066] The radio resource control layer processing unit 16 performs the RRC signaling based on the RRC signaling received from the base station device 3. The radio resource control layer processing unit 16 configures carrier aggregation based on the carrier aggregation configuration. The radio resource control layer processing unit 16 configures a serving cell (secondary cell, primary secondary cell) as part of the carrier aggregation configuration. The serving cell may be configured with a downlink component carrier. The serving cell may be configured with a downlink component carrier and an uplink component carrier. The radio resource control layer processing unit 16 controls the radio transceiver unit 10 to perform reception processing on the downlink component carrier configured in the carrier aggregation configuration. The radio resource control layer processing unit 16 controls the radio transceiver unit 10 to perform transmission processing on the uplink component carrier configured in the carrier aggregation configuration.

[0067] The medium access control layer processing unit (MAC layer processing unit) 15 receives the MAC CE from the base station device 3. (MAC Control Element) for secondary cell activation / deactivation The media access control layer processing unit (MAC layer processing unit) 15 performs activation. Based on a MAC CE (SCell Activation / Deactivation MAC CEs) including activation / deactivation information for the secondary cell, the medium access control layer processing unit 15 outputs information indicating activation / deactivation for multiple serving cells configured by the radio resource control layer processing unit 16 to the radio transceiver unit 10. The medium access control layer processing unit (MAC layer processing unit) 15 deactivates the secondary cell based on a timer. The medium access control layer processing unit (MAC layer processing unit) 15 determines that scheduling has not been performed for the serving cell by the base station device 3 for a certain period of time by measuring with the timer, deactivates the serving cell, and controls the radio transceiver unit 10.

[0068] The radio resource control layer processing unit 16 pre-configures (configures) a search space for each number of activated cells. The radio resource control layer processing unit 16 pre-configures (configures) a DCI form for each number of activated cells. The radio resource control layer processing unit 16 may group the number of activated cells and set a search space for each group (cell group) (plurality of activated cells) in advance. The radio resource control layer processing unit 16 may group the number of activated cells and set a DCI format for each group (cell group) (plurality of activated cells) in advance.

[0069] The radio resource control layer processing unit 16 may include function information generated based on the functions of the terminal device 1 in an RRC message and transmit the RRC message to the base station device 3.

[0070] The wireless transmission / reception unit 10 performs modulation, coding, and transmission processes. The wireless transmission / reception unit 10 generates a physical signal by performing coding, modulation, and baseband signal generation (conversion to a time-continuous signal) on data (transport blocks), and transmits the generated physical signal to the base station device 3.

[0071] The radio transmission / reception unit 10 performs demodulation processing, decoding processing, and reception processing. The radio transmission / reception unit 10 outputs a transport block from the information detected based on the demodulation processing and decoding processing of the received physical signal to the upper layer processing unit 14 on the DL-SCH.

[0072] The radio transceiver 10 stops various reception processes and various transmission processes in the deactivated serving cell. For example, the radio transceiver 10 stops monitoring the PDCCH in the deactivated serving cell. For example, the radio transceiver 10 stops receiving the PDSCH in the serving cell. Stop the transmission of SRS in the activated serving cell. 10 stops transmitting PUSCH in the deactivated serving cell.

[0073] The radio transceiver 10 determines the DCI format to be monitored based on the number of activated serving cells among the plurality of serving cells configured by the radio resource control layer processor 16. The radio transceiver unit 10 sets a DCI format including only scheduling information for the activated serving cells and performs blind decoding of the PDCCH. The size of the monitored DCI format varies depending on the number of activated serving cells. The radio transceiver 10 performs different decoding processes for DCI formats of different sizes.

[0074] The radio transceiver 10 monitors the PDCCH based on the number of activated serving cells among the multiple serving cells configured by the radio resource control layer processor 16. The radio resource control layer processing unit 16 sets a search area for each number of activated serving cells in advance for the radio transceiver unit 10, and sets the search area to be actually used from the set plurality of search areas in accordance with the number of activated serving cells. The radio transceiver unit 10 may set the search area for monitoring the PDCCH based on a DCI format that is set based on the number of activated serving cells. The number of serving cells may be grouped rather than one by one, and the search area may be divided into groups (cell groups). A different DCI format may be set for each of the activated cells. The number of processing cells is grouped instead of one by one, and a group (cell group) (multiple A different search area may be set for each activated cell. DCI formats (DCI format sizes) may be grouped rather than one by one, and a different search area may be set for each group (DCI format group) (DCI format size group).

[0075] The RF unit 12 converts (down-converts) the signal received via the antenna unit 11 into a baseband signal and removes unnecessary frequency components. The RF unit 12 outputs the baseband signal to the baseband unit 13.

[0076] The baseband unit 13 converts the analog signal input from the RF unit 12 into a digital signal. The baseband unit 13 extracts a CP (Cyclic Prefix) from the converted digital signal. The baseband unit 13 performs a fast Fourier transform (FFT) on the signal from which the CP has been removed, and extracts a signal in the frequency domain.

[0077] 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 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.

[0078] The RF unit 12 uses a low-pass filter to remove unnecessary frequency components from the analog signal input from the baseband unit 13, and up-converts the analog signal to a carrier frequency. The RF unit 12 converts the RF signal to generate an RF signal. The RF unit 12 transmits the RF signal via the antenna unit 11. The RF unit 12 also amplifies the power. The RF unit 12 may also have a function to control the transmission power. The RF unit 12 is also referred to as a transmission power control unit.

[0079] An example of the configuration of the base station device 3 according to one aspect of this embodiment will be described below.

[0080] FIG. 4 is a schematic block diagram showing a configuration of a base station device 3 according to one aspect of this embodiment. As shown in the figure, the base station device 3 includes a radio transmission / reception unit 30 and a higher layer processing unit 34. The radio transmission / reception unit 30 includes an antenna unit 31, an RF (Radio Frequency) unit 32, and a baseband unit 33. The higher layer processing unit 34 includes a medium access control layer processing unit 35 and a radio resource control layer processing unit 36. The radio transmission / reception unit 30 is also referred to as a transmitter, a receiver, or a physical layer processing unit.

[0081] The upper layer processing unit 34 processes the Medium Access Control (MAC) layer, Packet Data Convergence Protocol (PDCP) layer, Radio Link Control (RLC) layer, and Radio Resource Control (RRC) layer. Here, the MAC layer is also referred to as the MAC sublayer. The PDCP layer is also referred to as the PDCP sublayer. The RLC layer is also referred to as the RLC sublayer. The RRC layer is also referred to as the RRC sublayer.

[0082] The medium access control layer processing unit 35 included in the upper layer processing unit 34 performs MAC layer processing. Here, the MAC layer processing involves mapping between logical channels and transport channels, Or multiplexing multiple MAC SDUs (Service Data Units) into a transport block, or decomposing a transport block delivered from the physical layer on UL-SCH into one or multiple MAC SDUs. ,Application of HARQ (Hybrid Automatic Repeat reQuest) to transport blocks, and may include some or all of the processing of scheduling requests.

[0083] The radio resource control layer processing unit 36 ​​included in the upper layer processing unit 34 performs RRC layer processing. The RRC layer processing may include some or all of broadcast signal management, RRC connection / RRC idle state management, and RRC reconfiguration. The radio resource control layer processing unit 36 ​​generates downlink data (transport blocks) to be allocated to the PDSCH, system information, RRC messages, MAC CE, etc., or acquires them from upper nodes, and outputs them to the radio transceiver unit 30.

[0084] The radio resource control layer processing unit 36 ​​also manages various setting information / parameters (RRC parameters) of each terminal device 1. The radio resource control layer processing unit 36 ​​receives information via signals in higher layers. In other words, the radio resource control layer processing unit 36 ​​transmits / broadcasts information indicating the various setting information / parameters. The setting information may be information regarding a physical channel or a physical signal (i.e., a physical layer), a MAC layer, a PDCP layer, etc. The parameters may include information related to processing or configuration of the RLC layer, RRC layer, or RRC layer. The parameters may be higher layer parameters. For example, the radio resource control layer processing unit 36 ​​may include the RRC parameters in an RRC message on a certain logical channel and transmit the RRC parameters to the terminal device 1. Here, the RRC message may be mapped to any one of a BCCH (Broadcast Control CHannel), a CCCH (Common Control CHannel), and a DCCH (Dedicated Control CHannel).

[0085] The radio resource control layer processing unit 36 ​​receives the RRC message transmitted from the terminal device 1. The RRC parameters to be transmitted to the terminal device 1 may be determined based on the RRC parameters. Here, the RRC message transmitted from the terminal device 1 is related to the capability information report of the terminal device 1. That's fine.

[0086] The radio resource control layer processing unit 36 ​​sets a control resource set for the terminal device 1. Multiple PDCCH candidates are configured (set) within the set control resource set. The radio resource control layer processing unit 36 ​​sets a search space for the terminal device 1. The radio resource control layer processing unit 36 ​​sets a DCI format to be monitored in the search space for the terminal device 1.

[0087] The radio resource control layer processing unit 36 ​​sets a DCI format to be applied to the terminal device 1 within the control resource set. The radio resource control layer processing unit 36 ​​generates RRC signaling indicating the DCI format to be applied in the transmission processing unit.

[0088] The radio resource control layer processing unit 36 ​​sets resources for transmitting HARQ-ACK to the terminal device 1. The radio resource control layer processing unit 36 ​​sets resources for transmitting HARQ-ACK for PDSCH in the downlink frequency band (cell, component carrier, carrier). The uplink resource control layer processing unit 36 ​​allocates resources for transmitting HARQ-ACK for PDSCH to the uplink. link frequency band (cell, component carrier, carrier).

[0089] The radio resource control layer processing unit 36 ​​configures carrier aggregation for the terminal device 1. The radio resource control layer processing unit 36 ​​configures a serving cell (secondary cell, primary secondary cell) as the carrier aggregation configuration. The serving cell may be configured with a downlink component carrier. The serving cell may be configured with a downlink component carrier and an uplink component carrier. The radio resource control layer processing unit 36 ​​controls the radio transceiver unit 30 to perform transmission processing for the terminal device 1 using the downlink component carrier configured in the carrier aggregation configuration. The radio resource control layer processing unit 36 ​​controls the radio transceiver unit 30 to perform reception processing for the terminal device 1 using the uplink component carrier configured in the carrier aggregation configuration.

[0090] The medium access control layer processing unit (MAC layer processing unit) 35 activates the secondary cell. The medium access control layer processing unit (MAC layer processing unit) 35 generates MAC CEs (SCell Activation / Deactivation MAC CEs) that instruct activation / deactivation of secondary cells for multiple serving cells configured by the radio resource control layer processing unit 36. The medium access control layer processing unit (MAC layer processing unit) 35 deactivates secondary cells based on a timer. The medium access control layer processing unit (MAC layer processing unit) 35 determines that scheduling has not been performed for a serving cell for a certain period of time by measuring with the timer, deactivates the serving cell, and controls the radio transceiver unit 30.

[0091] The radio resource control layer processing unit 36 ​​pre-configures (configures) a search space for each number of activated cells. The radio resource control layer processing unit 36 ​​pre-configures (configures) a DCI form for each number of activated cells. The radio resource control layer processing unit 36 ​​generates RRC signaling to be applied to the terminal device 1 and indicates a DCI format for each number of activated cells. The radio resource control layer processing unit 36 ​​generates RRC signaling to be applied to the terminal device 1 and indicates a DCI format for each number of activated cells. Radio resource control layer processing unit The radio resource control layer processing unit 36 ​​may group the number of activated cells and set a search space for each group (cell group) (plurality of activated cells) in advance. The radio resource control layer processing unit 36 ​​may group the number of activated cells and set a DCI format for each group (cell group) (plurality of activated cells) in advance.

[0092] The functions of the radio transceiver 30 are similar to those of the radio transceiver 10, and therefore a description thereof will be omitted where appropriate. The radio transceiver 30 performs physical layer processing. Here, the physical layer processing may include some or all of the following: generation of a baseband signal of a physical channel, generation of a baseband signal of a physical signal, detection of information transmitted by the physical channel, and detection of information transmitted by the physical signal. The physical layer processing may also include mapping of a transport channel to a physical channel. Here, the baseband signal is also referred to as a time-continuous signal.

[0093] The radio transceiver 30 may perform one or both of demodulation and decoding. The radio transceiver 30 may deliver a transport block of information detected based on the demodulation and decoding of a received physical signal to a higher layer on the UL-SCH. For example, the radio transceiver 30 may generate a baseband signal of a downlink physical channel. Here, the transport block delivered from a higher layer on the DL-SCH may be allocated to the downlink physical channel. For example, the radio transceiver 30 may generate a baseband signal of a downlink physical signal.

[0094] The radio transceiver unit 30 may perform some or all of modulation processing, coding processing, and transmission processing. The radio transceiver unit 30 may generate a physical signal based on some or all of coding processing, modulation processing, and baseband signal generation processing for the transport block. The radio transceiver unit 30 may map the physical signal to a BWP. The radio transceiver unit 30 may transmit the generated physical signal. For example, the radio transceiver unit 30 may attempt to detect information transmitted by an 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 radio transceiver unit 30 may attempt to detect information transmitted by an uplink physical signal.

[0095] The radio transmission / reception unit 30 grasps the SS (Search space) configured in the terminal device 1. The radio transmission / reception unit 30 grasps the search space in the control resource set configured in the terminal device 1. The radio transmission / reception unit 30 grasps PDCCH candidates monitored in the terminal device 1, The radio transmission / reception unit 30 grasps the search area for each PDCCH candidate monitored in the terminal device 1. It is determined which control channel elements the PDCCH candidate is made up of (the PDCCH candidate is made up of The radio transceiver 30 includes an SS determining unit, which determines the SS configured in the terminal device 1. The SS determining unit determines one or more PDCCH candidates in the control resource set configured as the search space of the terminal device. SS determining unit grasps the PDCCH candidates (the number of PDCCH candidates, the numbers of the PDCCH candidates) configured in the search area of ​​the control resource set of the terminal device 1.

[0096] The SS ascertaining unit ascertains the configuration of the search space within the control resource set (the number of PDCCH candidates, the OFDM symbols of the PDCCH candidates, and the aggregation level of the PDCCH candidates). The transmitting unit (transmission processing unit) of the radio transmitting / receiving unit 30 notifies the terminal device 1 of the PDCCH candidates within the search space of the control resource set. The PDCCH is transmitted using the

[0097] The transmitter (also referred to as a transmission processor) of the base station device 3 transmits the PDCCH. The transmission processing unit of the base station device 3 transmits the PDCCH using PDCCH candidates monitored in the terminal device 1. The transmission processing unit of the base station device 3 transmits the PDCCH using resources corresponding to PDCCH candidates in a search area set for the terminal device 1. The transmission processing unit of the base station device 3 transmits the PDCCH using resources corresponding to PDCCH candidates in a search area set for the terminal device 1. The PDCCH is transmitted using the PDCCH candidates in the search area where the matching is performed.

[0098] The receiving unit (also referred to as a receiving processing unit) of the base station device 3 receives the HARQ-ACK. The receiving processing unit of the base station device 3 receives the HARQ-ACK for the PDSCH. The receiving processing unit of the base station device 3 The reception processing unit of the base station device 3 receives the HARQ-ACK for the PDSCH in the downlink frequency band (cell, component carrier, carrier) managed by the base station device 3. do.

[0099] The radio transceiver 30 stops various reception processes and various transmission processes in the deactivated serving cell. For example, the radio transceiver unit 30 stops transmitting the PDCCH when the deactivated serving For example, the radio transceiver unit 30 is deactivated. For example, the radio transceiver unit 30 stops receiving SRS in the serving cell. The reception of PUSCH in the deactivated serving cell is stopped.

[0100] The radio transceiver 30 sets the DCI format to be used for the terminal device 1 based on the number of activated serving cells among the multiple serving cells configured by the radio resource control layer processor 36. The radio transceiver 30 sets the DCI format to be used for the activated serving cells. The radio transceiver 30 sets a DCI format including only the scheduling information to be transmitted using the PDCCH. The size of the DCI format used varies depending on the number of activated serving cells. The radio transceiver 30 performs different coding processes for DCI formats of different sizes.

[0101] The radio transceiver 30 transmits a PDCCH to the terminal device 1 based on the number of activated serving cells among the plurality of serving cells configured by the radio resource control layer processing unit 36. The base station device 3 sets a search space including PDCCH candidates to be used for transmission of the PDCCH. The PDCCH is transmitted using PDCCH candidates that form a search space in which the PDCCH is monitored. The radio resource control layer processing unit 36 ​​pre-sets search areas for the radio transceiver unit 30 for each number of activated serving cells, and the radio transceiver unit 30 sets the search area to be actually used from among the set search areas according to the number of activated serving cells. The radio transceiver unit 30 uses the DCI format set based on the number of activated serving cells. A search space including PDCCH candidates used for transmitting the PDCCH may be set based on the matrix. The number of serving cells may be grouped rather than set one by one, and a different DCI format may be set for each group (cell group) (plurality of activated cells). The number of serving cells may be grouped rather than set one by one, and a different search space may be set for each group (cell group) (plurality of activated cells). The DCI formats (DCI format sizes) may be grouped rather than set one by one, and a different search space may be set for each group.

[0102] The RF unit 32 may convert the signal received via the antenna unit 31 into a baseband signal and remove unnecessary frequency components. The RF unit 32 outputs the baseband signal to the baseband unit 33.

[0103] The baseband unit 33 may digitize the baseband signal input from the RF unit 32. The baseband unit 33 may remove a portion corresponding to a CP (Cyclic Prefix) from the digitized baseband signal. Alternatively, a fast Fourier transform (FFT) may be performed on the subband signal to extract a frequency domain signal.

[0104] 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 to which the CP has been added into an analog signal. The baseband unit 33 may output the analog baseband signal to the RF unit 32.

[0105] The RF unit 32 may remove unnecessary frequency components from the baseband signal input from the baseband unit 33. The RF unit 32 may up-convert the baseband signal to a 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 of controlling transmission power.

[0106] Each of the units designated by reference numerals 10 to 16 in the terminal device 1 may be configured as a circuit. Each of the units designated by reference numerals 30 to 36 in the base station device 3 may be configured as a circuit.

[0107] Hereinafter, physical channels and physical signals according to various aspects of the present embodiment will be described.

[0108] The physical signal is a general term for a downlink physical channel, a downlink physical signal, an uplink physical channel, and an uplink physical channel. The physical channel is a general term for a downlink physical channel and an uplink physical channel. The physical signal is a general term for a downlink physical signal and an uplink physical signal.

[0109] An uplink physical channel may correspond to a set of resource elements carrying information generated in a higher layer. An uplink physical channel is a physical channel used in an uplink component carrier. An uplink physical channel may be transmitted by the radio transceiver unit 10. An uplink physical channel may be received by the radio transceiver unit 30. In a wireless communication system according to one aspect of the present 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)

[0110] The PUCCH transmits (transmits) uplink control information (UCI). The uplink control information may be placed in the PUCCH. The wireless transmission and reception unit 10 may transmit a PUCCH in which uplink control information is arranged. The receiving unit 30 may receive a PUCCH in which uplink control information is arranged.

[0111] Uplink control information (uplink control information bit, uplink control information sequence, uplink control information type) is used in combination with channel state information (CSI), schedule Scheduling Request (SR), HARQ-ACK (Hybrid Automatic Repeat The uplink control information may include some or all of the request ACKnowledgement (ACK) information. Note that the uplink control information may also include information not described above.

[0112] The channel state information is also referred to as a channel state information bit or a channel state information sequence. The scheduling request is also referred to as a scheduling request bit or a scheduling request sequence. The HARQ-ACK information is also referred to as a HARQ-ACK information bit or a HARQ-ACK information sequence.

[0113] The HARQ-ACK information may be configured by HARQ-ACK bits corresponding to one transport block (TB). The HARQ-ACK bits may indicate an acknowledgement (ACK) or a negative acknowledgement (NACK) 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. The HARQ-ACK information may include one or more HARQ-ACK bits.

[0114] HARQ-ACK for transport blocks is also called HARQ-ACK for PDSCH. Here, "HARQ-ACK for PDSCH" may refer to HARQ-ACK for a transport block included in the PDSCH.

[0115] A scheduling request may be used to request UL-SCH resources for an initial transmission. The scheduling request bit is either a positive SR or may be used to indicate either a negative SR. When the scheduling request bit indicates a positive SR, this is also referred to as "a positive SR is transmitted (communicated)." A positive SR may indicate that the terminal device 1 requests UL-SCH resources for the initial transmission. When the scheduling request bit indicates a negative SR, this is also referred to as "a negative SR is transmitted (communicated)." A negative SR may indicate that the terminal device 1 does not request UL-SCH resources for the initial transmission.

[0116] The channel state information is a channel quality indicator (CQI), a pre-conditioning The CQI may include some or all of a precoder matrix indicator (PMI) and a rank indicator (RI). The CQI is an indicator related to the quality of the propagation path (e.g., propagation strength) or the quality of the physical channel, and the PMI is an indicator related to the precoder. The RI is an indicator related to the transmission rank (or the number of transmission layers).

[0117] The channel state information is an indicator related to the reception state of a physical signal (e.g., CSI-RS) used for channel measurement. The value of the channel state information may be determined by the terminal device 1 based on the reception state assumed by the physical signal used for channel measurement. The channel measurement may include interference measurement.

[0118] The PUCCH may have a PUCCH format, where the PUCCH format may be a format of physical layer processing of the PUCCH, or a format of information transmitted using the PUCCH.

[0119] The PUSCH carries uplink control information and / or transport blocks. The PUSCH may be transmitted to convey uplink control information and transport information. The PUSCH may be used to carry one or both of the transport blocks. The PUSCH may be used to transmit at least some or all of the port blocks, HARQ-ACKs, channel state information, and scheduling requests. The PUSCH is used at least to transmit access message 3. The PUSCH may be used to transmit information that is not related to the uplink control information. The terminal device 1 may transmit a PUSCH in which one or both of the uplink control information and the transport block are allocated. The base station device 3 may receive a PUSCH in which one or both of the uplink control information and the transport block are allocated.

[0120] PRACH is the index of the random access preamble (random access message The terminal device 1 may transmit the PRACH. The base station device 3 may receive the PRACH. The terminal device 1 may transmit a random access preamble on the PRACH. The base station device 3 may transmit a random access preamble on the PRACH. may be received.

[0121] The uplink physical signal may correspond to a set of resource elements. The uplink physical signal does not have to be used to transmit information generated in a higher layer. The uplink physical signal may be used to transmit information generated in a physical layer. The uplink physical signal may be a physical signal used in an uplink component carrier. The radio transceiver unit 10 may transmit the uplink physical signal. The radio transceiver unit 30 may receive the uplink physical signal. In the uplink of the wireless communication system according to one aspect of the present 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)

[0122] UL DMRS is a general term for DMRS for PUSCH and DMRS for PUCCH.

[0123] The set of antenna ports for DMRSs for PUSCH (DMRSs related to PUSCH, DMRSs included in PUSCH, and DMRSs corresponding to PUSCH) may be determined based on the set of antenna ports for the PUSCH. For example, the set of antenna ports for DMRSs for PUSCH may be the same as the set of antenna ports for the PUSCH.

[0124] The propagation path of the PUSCH may be estimated from the DMRS for the PUSCH.

[0125] 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.

[0126] The propagation path of the PUCCH may be estimated from the DMRS for the PUCCH.

[0127] The downlink physical channel may correspond to a set of resource elements that convey information generated in a higher layer. The downlink physical channel may be a physical channel used in a downlink component carrier. The radio transceiver 30 may transmit the downlink physical channel. The radio transceiver 10 may receive the downlink physical channel. In the downlink of the wireless communication system according to one aspect of the present 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)

[0128] The PBCH is transmitted to carry Master Information Blocks (MIBs) and / or physical layer control information, which is information generated in the physical layer. The MIBs are RRC messages delivered from higher layers on the Broadcast Control Channel (BCCH).

[0129] PDCCH is used to transmit (transmit) downlink control information (DCI). The downlink control information may be placed in the PDCCH. The terminal device 1 may receive the PDCCH in which the downlink control information is arranged. Alternatively, a PDCCH in which downlink control information is allocated may be transmitted.

[0130] The downlink control information may be transmitted with a DCI format. The DCI format may be interpreted as a format of the downlink control information. The DCI format may be It may also be interpreted as a set of downlink control information set in a certain downlink control information format.

[0131] The base station device 3 may notify the terminal device 1 of downlink control information using a PDCCH with a DCI format. Here, the terminal device 1 may monitor the PDCCH to acquire the downlink control information. Unless otherwise specified, the DCI format and the downlink control information may be described as equivalent. For example, the base station device 3 may include the downlink control information in a DCI format and transmit it to the terminal device 1. Furthermore, the terminal device 1 may control the radio transceiver unit 10 using the downlink control information included in the detected DCI format.

[0132] The downlink control information may include at least either a downlink grant (DL grant) or an uplink grant (UL grant). A DCI format used for scheduling the PDSCH is also referred to as a downlink DCI format. A DCI format used for scheduling the PUSCH is also referred to as an uplink DCI format. A downlink grant is also referred to as a downlink assignment (DL assignment) or a downlink allocation (DL allocation).

[0133] DCI format 0_0, DCI format 0_1, DCI format 1_0, and DCI format The uplink DCI format is a collective term for DCI format 0_0 and DCI format 0_1. The downlink DCI format is a DCI format This is a general term for Format 1_0 and DCI Format 1_1.

[0134] DCI format 0_0 is used for scheduling PUSCH allocated to a certain cell. DCI format 0_0 is configured to include at least some or all of 1A to 1E. 1A) 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)

[0135] The DCI format specific field is a DCI format specific field. The DCI format specification field may indicate whether the format is an uplink DCI format or a downlink DCI format. That is, the DCI format specification field may be included in both the uplink DCI format and the downlink DCI format. Here, DCI format 0_0 The DCI format specific field included in may indicate 0.

[0136] The frequency domain resource allocation field included in DCI format 0_0 is It may also be used to indicate the allocation of frequency resources for PUSCH scheduled by metric 0_0.

[0137] The time domain resource allocation field included in DCI format 0_0 is It may also be used to indicate the allocation of time resources for PUSCH scheduled by mat0_0.

[0138] The frequency hopping flag field may be used to indicate whether frequency hopping is applied to the PUSCH scheduled by the DCI format 0_0. stomach.

[0139] The MCS field included in DCI format 0_0 is scheduled by that DCI format 0_0. The modulation scheme for the PUSCH to be scheduled and the DCI format 0_1 The target coding rate may be used to indicate one or both of the target coding rates for the transport blocks placed on the PUSCH. The size of a transport block (TBS) allocated to the PUSCH may be determined based on a target coding rate and part or all of a modulation scheme for the PUSCH.

[0140] DCI format 0_0 may not include a field used for a CSI request. DCI format 0_0 may not include a carrier indicator field. DCI format 0_0 may not include a BWP field.

[0141] DCI format 0_1 ​​is used for scheduling PUSCH allocated to a certain cell. DCI format 0_1 ​​is configured to include some or all of fields 2A to 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)

[0142] The DCI format specific field included in DCI format 0_1 ​​may indicate 0. .

[0143] The frequency domain resource allocation field included in DCI format 0_1 ​​is It may also be used to indicate the allocation of frequency resources for PUSCH scheduled by the metric 0_1.

[0144] The time domain resource allocation field included in DCI format 0_1 ​​is It may also be used to indicate the allocation of time resources for PUSCH scheduled by mat 0_1.

[0145] The MCS field included in DCI format 0_1 ​​is scheduled by that DCI format 0_1. The modulation scheme for the PUSCH to be scheduled and the DCI format 0_1 Used to indicate one or both of the target coding rates for the PUSCH being queued. It may be possible.

[0146] The CSI request field may be used to indicate the reporting of CSI.

[0147] The BWP field of DCI format 0_1 ​​is scheduled by the DCI format 0_1. It may be used to indicate the uplink BWP in which the PUSCH to be mapped is located. Format 0_1 ​​may or may not involve a change in the active uplink BWP. The terminal device 1 detects DCI format 0_1 ​​used for scheduling the PUSCH. Based on this, the uplink BWP in which the PUSCH is arranged may be recognized.

[0148] The DCI format 0_1 ​​that does not include a BWP field may be a DCI format for scheduling a PUSCH without changing the active uplink BWP. The terminal device 1 may recognize that the PUSCH is to be transmitted without switching the active uplink BWP based on detecting the DCI format 0_1 ​​that is used for scheduling a PUSCH and does not include a BWP field.

[0149] DCI format 0_1 ​​includes a BWP field, but terminal device 1 does not use DCI format 0_1 If the terminal device 1 does not support the BWP switching function, the BWP field may be ignored by the terminal device 1. In other words, the terminal device 1 that does not support the BWP switching function may DCI format 0_1 ​​used for scheduling and the BWP field Switching the active uplink BWP based on detecting DCI format 0_1 ​​including Here, if the BWP switching function is supported, the radio resource control layer processing unit 16 may recognize that the BWP switching function is supported. The RRC message may include capability information indicating that the RRC message is supported.

[0150] If the DCI format 0_1 ​​includes a carrier indicator field, the carrier indicator field indicates the uplink component carrier on which the PUSCH is arranged. The terminal device 1 may detect DCI format 0_1 ​​in the downlink component carrier of a serving cell and determine whether the PUSCH scheduled by the DCI format 0_1 ​​is included in the DCI format 0_1. It may be appreciated that the UE may be located on the uplink component carrier of the serving cell as indicated by the carrier indicator field included in the UE.

[0151] If DCI format 0_1 ​​does not include a carrier indicator field, The serving cell to which the uplink component carrier on which the PUSCH scheduled by the DCI format 0_1 ​​is allocated belongs is a serving cell to which the PDCCH including the DCI format 0_1 ​​is allocated. The terminal device 1 may use a DCI format in a certain downlink component carrier of a certain serving cell. Based on detecting DCI format 0_1, it may be recognized that the PUSCH scheduled by the DCI format 0_1 ​​is to be allocated to the uplink component carrier of the serving cell.

[0152] The UL DAI field is at least used to indicate the transmission status of the PDSCH. When 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 in the PUSCH. The UL DAI field indicates the number of HARQ-ACKs included in the HARQ-ACK codebook transmitted in the PUSCH. The UL DAI field indicates the number of PDSCHs in which the corresponding HARQ-ACK is included in the HARQ-ACK codebook transmitted in the PUSCH. The UL DAI field indicates the number of PDSCHs and SPS releases in which the corresponding HARQ-ACK is included in the HARQ-ACK codebook transmitted in the PUSCH.

[0153] The UL DAI field may indicate a value to which a modulo operation has been applied. An example in which the UL DAI field is 2 bits will be described. If the number of PDSCHs in which the corresponding HARQ-ACK is included in the HARQ-ACK codebook transmitted on the PUSCH is 0, the UL DAI field indicates "00". The HARQ-ACK codebook transmitted on the PUSCH includes the corresponding HARQ-ACK. If the number of PDSCHs that include the corresponding HARQ-ACK in the HARQ-ACK codebook transmitted on the PUSCH is 2, the UL DAI field is set to "01". The UL DAI field indicates "10". If the number of PDSCHs in which the corresponding HARQ-ACK is included in the HARQ-ACK codebook transmitted on the PUSCH is three, the UL DAI field indicates "11". If the number of PDSCHs in which the corresponding HARQ-ACK is included in the HARQ-ACK codebook transmitted on the PUSCH is four, the UL DAI field indicates "00". If the number of PDSCHs in which the corresponding HARQ-ACK is included in the HARQ-ACK codebook transmitted on the PUSCH is five, the UL DAI field indicates "01". If the number of PDSCHs in which the corresponding HARQ-ACK is included in the HARQ-ACK codebook transmitted on the PUSCH is six, the UL DAI field indicates "10". If the number of PDSCHs in which the corresponding HARQ-ACK is included in the HARQ-ACK codebook transmitted on the PUSCH is seven, the UL DAI field indicates "11". In this example, in the HARQ-ACK codebook transmitted on the PUSCH, a modulo operation using the number '4' is performed on the number of PDSCHs in which the corresponding HARQ-ACK is included.

[0154] The terminal device 1 interprets the UL DAI field taking into account the total number of received PDSCHs. For example, the terminal device 1 receives four PDSCHs and receives a UL DAI field indicating "00". In this case, the terminal device 1 interprets that the number of PDSCHs in which the corresponding HARQ-ACK is included in the HARQ-ACK codebook transmitted in the PUSCH, indicated by the UL DAI field, is four. For example, the terminal device 1 receives three PDSCHs and receives a UL DAI field indicating "00". In this case, the terminal device 1 interprets that the number of PDSCHs in which the corresponding HARQ-ACK is included in the HARQ-ACK codebook transmitted in the PUSCH, indicated by the UL DAI field, is four, and determines that reception of one PDSCH has been missed.

[0155] DCI format 1_0 is used for scheduling PDSCH allocated to a certain cell. DCI format 1_0 is composed of some or all of 3A to 3F. 3A) DCI Format Specific Fields 3B) Frequency domain resource allocation field 3C) Time Domain Resource Allocation Field 3D) MCS field 3E) PDSCH_HARQ feedback timing indicator field 3F) PUCCH resource indicator field

[0156] The DCI format specific field included in DCI format 1_0 may indicate 1. .

[0157] The frequency domain resource allocation field included in DCI format 1_0 is 1 shows the allocation of frequency resources for PDSCH scheduled by the LTE. It may also be used for

[0158] The time domain resource allocation field included in DCI format 1_0 is To show the allocation of time resources for PDSCH scheduled by the It may also be used for

[0159] The MCS field included in DCI format 1_0 may be used to indicate one or both of the modulation scheme for the PDSCH scheduled by the DCI format and the target coding rate for the PDSCH scheduled by the DCI format. The target coding rate is the target for the transport blocks placed on the PDSCH. The size of a transport block (TBS) allocated to the PDSCH may be determined based on one or both of the target coding rate and the modulation scheme for the PDSCH.

[0160] The PDSCH_HARQ feedback timing indication field is set to the last OFDM symbol of the PDSCH. offset from the slot containing the first OFDM symbol of the PUCCH to the slot containing the first OFDM symbol of the PUCCH It may be used to indicate timing from PDSCH to HARQ feedback. The indication field may be a field indicating the timing K1. When the index of a slot including a PUCCH or PUSCH including at least a HARQ-ACK corresponding to a transport block included in the PDSCH is slot n, the index of a slot including the last OFDM symbol of the PDSCH may be n+K1. If the slot index is slot n, the transport block included in the PDSCH The index of the slot including the first OFDM symbol of the PUCCH or the first OFDM symbol of the PUSCH including at least the HARQ-ACK corresponding to the lock may be n+K1.

[0161] The PDSCH_HARQ feedback timing indication field indicates the timing of the PDSCH-to-HARQ feedback. This may also be referred to as a PDSCH-to-HARQ_feedback timing indicator field or a HARQ indication field.

[0162] The PUCCH resource indication field may be used to indicate the resource of the PUCCH.

[0163] DCI format 1_0 may not include a carrier indicator field. That is, the downlink in which the PDSCH scheduled by DCI format 1_0 is allocated The component carrier is a downlink on which a PDCCH including the DCI format 1_0 is arranged. The terminal device 1 may detect DCI format 1_0 in a certain downlink component carrier and determine the DCI format 1_0 based on the DCI format 1_0. It may be recognized that the PDSCH scheduled by the downlink component carrier 1_0 is placed on the downlink component carrier.

[0164] DCI format 1_0 may not include a BWP field. Here, DCI format 1_0 may be a DCI format for scheduling a PDSCH without changing an active downlink BWP. The 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.

[0165] DCI format 1_1 is used for scheduling PDSCH allocated to a certain cell. DCI format 1_1 is composed of some or all of 4A to 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 indication field 4G) PUCCH resource indication field 4H) BWP Field 4I) Career Indicator Field

[0166] The DCI format specific field included in DCI format 1_1 may indicate 1 .

[0167] The frequency domain resource allocation field included in DCI format 1_1 is It may also be used to indicate the allocation of frequency resources for the PDSCH scheduled by the mobile station 1_1.

[0168] The time domain resource allocation field included in DCI format 1_1 is It may also be used to indicate the allocation of time resources for the PDSCH scheduled by mat 1_1.

[0169] The MCS field included in DCI format 1_1 is scheduled by the DCI format 1_1. The modulation scheme for the PDSCH to be scheduled and the DCI format 1_1 Used to indicate one or both of the target coding rates for the PDSCH being enumerated. It may be possible.

[0170] If DCI format 1_1 includes a PDSCH_HARQ feedback timing indication field, the PDSCH_HARQ feedback timing indication field is set to the last OFDM sequence of the PDSCH. From the slot containing the first OFDM symbol to the slot containing the first OFDM symbol of PUCCH It may be used to indicate the offset. If the clock timing indication field is not included, the last OFDM symbol of the PDSCH is included. This indicates the offset from the slot containing the first OFDM symbol of the PUCCH to the slot containing the first OFDM symbol of the PUCCH. The parameters may be provided by the RRC layer.

[0171] The PUCCH resource indication field may be used to indicate the resource of the PUCCH.

[0172] The BWP field of DCI format 1_1 is scheduled by the DCI format 1_1. It may be used to indicate the downlink BWP where the PDSCH to be mapped is located. Format 1_1 may or may not involve a change of the active downlink BWP. The terminal device 1 may recognize the downlink BWP in which the PDSCH is arranged based on detecting DCI format 1_1 used for scheduling the PDSCH.

[0173] The DCI format 1_1 that does not include a BWP field may be a DCI format for scheduling a PDSCH without changing the active downlink BWP. The terminal device 1 may recognize that it will receive the PDSCH without switching the active downlink BWP based on detecting the DCI format 1_1 that is used for scheduling a PDSCH and does not include a BWP field.

[0174] DCI format 1_1 includes a BWP field, but terminal device 1 does not use DCI format 1_1 If the terminal device 1 does not support the BWP switching function, the BWP field may be ignored by the terminal device 1. In other words, the terminal device 1 that does not support the BWP switching function uses DCI format 1_1 used for PDSCH scheduling and the BWP field Switching the active downlink BWP based on detecting DCI format 1_1 containing Here, if the BWP switching function is supported, the radio resource control layer processing unit 16 may recognize that the BWP switching function is supported. The RRC message may include capability information indicating that the RRC message is supported.

[0175] When 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 on which the PDSCH scheduled by DCI format 1_1 is arranged. Based on detecting DCI format 1_1 on the downlink component carrier of a serving cell, the terminal device 1 may recognize that the PDSCH scheduled by DCI format 1_1 is arranged on the downlink component carrier of the serving cell indicated by the carrier indicator field included in DCI format 1_1.

[0176] If DCI format 1_1 does not include a carrier indicator field, The downlink component carrier on which the PDSCH scheduled by the DCI format 1_1 is arranged is the downlink component carrier on which the PDCCH including the DCI format 1_1 is arranged. The terminal device 1, based on detecting DCI format 1_1 in a certain downlink component carrier, recognizes that the PDSCH scheduled by the DCI format 1_1 is to be allocated to the downlink component carrier. You may recognize it.

[0177] A downlink grant is used for scheduling one PDSCH in one serving cell. The downlink grant is at least used for scheduling the PDSCH in the same slot as the slot in which the downlink grant is transmitted. The downlink grant may be used for scheduling the PDSCH in a slot different from the slot in which the downlink grant is transmitted. It is used for scheduling at least one PUSCH in the serving cell.

[0178] Note that various DCI formats contain additional fields other than those mentioned above. A field indicating the cumulative number of transmitted PDCCHs (C-DAI: Counter Downlink Assignment Index field) may be included. A field indicating the total number of transmitted PDCCHs (T-DAI: Total Downlink Assignment Index field) may be included.

[0179] The PDSCH may be transmitted to transmit a transport block. The PDSCH may be used to transmit a transport block. The transport block may be arranged in the PDSCH. The base station device 3 may transmit the PDSCH in which the transport block is arranged. The terminal device 1 may receive the PDSCH in which the transport block is arranged.

[0180] A DCI format (referred to as a multi-cell DCI format) for scheduling data for multiple cells is used. The multi-cell DCI format includes scheduling information for data for multiple cells in one DCI format. The multi-cell DCI format includes multiple frequency domain resource allocation fields, multiple time domain resource allocation fields, multiple MCS fields, etc. for multiple cells. The multi-cell DCI format (downlink multi-cell DCI format) for scheduling PDSCH includes scheduling information for PDSCH for multiple cells. The multi-cell DCI format (uplink multi-cell DCI format) for scheduling PUSCH includes scheduling information for PUSCH for multiple cells.

[0181] The multi-cell DCI format for scheduling PDSCHs of multiple cells (downlink multi-cell DCI format) uses one PDSCH_HARQ feedback timing indication field. The uplink multi-cell DCI format may include only one UL DAI field. The multi-cell DCI format for scheduling PDSCHs of multiple cells may include only one PUCCH resource indication field. The multi-cell DCI format for scheduling PUSCHs of multiple cells (uplink multi-cell DCI format) may include only one CSI request field, and when CSI transmission is indicated in the CSI request field, the CSI may be transmitted from a specific cell (e.g., the cell with the smallest serving cell index) among one or more cells for which PUSCHs are actually scheduled in the multi-cell DCI format. The uplink multi-cell DCI format may include only one UL DAI field, and the UL DAI field may be applied to the PUSCH of a specific predetermined cell. The downlink multi-cell DCI format may not include a carrier indicator field, and the scheduling information for which cell the data is scheduled may be determined based on the position of the scheduling information field for each data. The uplink multi-cell DCI format may not include a carrier indicator field, and the scheduling information for which cell the data is scheduled may be determined based on the position of the scheduling information field for each data.

[0182] The downlink multi-cell DCI format may include multiple BWP fields, and the scheduling information for data of each cell may include a BWP field. The multi-cell DCI format may include multiple BWP fields, and the BWP field may be included in the data scheduling information for each cell. The downlink multi-cell DCI format may include multiple PDSCH_HARQ feedback timing indication fields, and the PDSCH_HARQ feedback timing indication field may be included in the data scheduling information for each cell. The uplink multi-cell DCI format may include multiple UL DAI fields, and the data scheduling information for each cell may include the UL DAI field. The downlink multi-cell DCI format may include multiple carrier indicator fields, and the carrier indicator field may be included in the data scheduling information for each cell, indicating the data scheduling information for which cell. The uplink multi-cell DCI format may include multiple carrier indicator fields, and the data scheduling information for each cell may include the carrier indicator field, indicating the data scheduling information for which cell. The downlink multi-cell DCI format may include multiple fields indicating HARQ process identifiers, and the data scheduling information for each cell may include a field indicating the HARQ process identifier. The uplink multi-cell DCI format may include a field indicating multiple HARQ process identifiers, and the scheduling information for data of each cell may include a field indicating the HARQ process identifiers.The downlink multi-cell DCI format may include a field indicating multiple NDIs, and the scheduling information for data of each cell may include a field indicating the NDIs.The uplink multi-cell DCI format may include a field indicating multiple NDIs, and the scheduling information for data of each cell may include a field indicating the NDIs.

[0183] The downlink physical signal may correspond to a set of resource elements. The downlink physical signal does not have to be used to transmit information generated in a higher layer. The downlink physical signal may be used to transmit information generated in a physical layer. The downlink physical signal may be a physical signal used in a downlink component carrier. The radio transceiver unit 10 may receive the downlink physical signal. The radio transceiver unit 30 may transmit the downlink physical signal. In the downlink of the wireless communication system according to one aspect of the present 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)

[0184] The synchronization signal is used by the terminal device 1 to synchronize the frequency domain and / or the time domain of the downlink. The synchronization signal includes a PSS (Primary Synchronization Signal) and and SSS (Secondary Synchronization Signal).

[0185] The SS block (SS / PBCH block) contains at least some or all of the PSS, SSS, and PBCH. It is composed of at least

[0186] The antenna ports for the PSS, SSS, PBCH, and DMRS for the PBCH may be the same.

[0187] The PBCH for which a PBCH symbol is transmitted in a certain antenna port is a DMRS for the PBCH that is arranged in a slot to which the PBCH is mapped, and is a SS / PBCH block including the PBCH. The PBCH may be estimated by the DMRS for the PBCH included in

[0188] DL DMRS is the sum of DMRS for PBCH, DMRS for PDSCH, and DMRS for PDCCH. It is a title.

[0189] The set of antenna ports for DMRSs for a PDSCH (DMRSs associated with a PDSCH, DMRSs included in a PDSCH, and DMRSs corresponding to a PDSCH) may be determined based on the set of antenna ports for the PDSCH. For example, the set of antenna ports for DMRSs for a PDSCH may be the same as the set of antenna ports for the PDSCH.

[0190] The propagation path of a PDSCH may be estimated from the DMRS for that PDSCH. A set of resource elements on which a DMRS symbol is transmitted and the DMRS symbol for the PDSCH are transmitted. When a set of resource elements on which symbols of a PDSCH are transmitted is included in the same precoding resource group (PRG), the PDSCH on which the symbols of the PDSCH are transmitted for an antenna port may be estimated by the DMRS for the PDSCH.

[0191] The antenna port of the DMRS for the PDCCH (DMRS related to the PDCCH, DMRS included in the PDCCH, DMRS corresponding to the PDCCH) may be the same as the antenna port for the PDCCH.

[0192] The propagation path of a PDCCH may be estimated from the DMRS for that PDCCH. A set of resource elements on which a DMRS symbol is transmitted and the symbol of the DMRS for the PDCCH are If the same precoder is applied (or is assumed to be applied, or is assumed to be applied) in the set of resource elements on which symbols of a PDCCH are transmitted, the PDCCH on which a symbol of the PDCCH on a certain antenna port is transmitted may be estimated by the DMRS for the PDCCH.

[0193] The BCH (Broadcast CHannel), the UL-SCH (Uplink-Shared CHannel), and the DL-SCH (Downlink-Shared CHannel) are transport channels.

[0194] The BCH of the transport layer may be mapped to the PBCH of the physical layer. The transport blocks delivered from higher layers on the BCH of the transport layer are mapped to the PBCH of the physical layer. The UL-SCH of the transport layer may also be mapped to the PUSCH of the physical layer. stomach.

[0195] The transport layer may apply Hybrid Automatic Repeat reQuest (HARQ) to the transport block.

[0196] The BCCH (Broadcast Control CHannel), CCCH (Common Control CHannel), and DCCH (Dedicated Control CHannel) are logical channels. For example, the BCCH may be used to deliver an RRC message including an MIB or an RRC message including system information. The CCCH may also be used to transmit an RRC message including RRC parameters common to multiple terminal devices 1. Here, the CCCH may be used, for example, for terminal devices 1 that are not RRC connected. The DCCH may also be used to transmit an RRC message dedicated to a certain terminal device 1. Here, the DCCH may be used, for example, for terminal devices 1 that are RRC connected.

[0197] The BCCH may be mapped to the BCH or DL-SCH. RRC messages containing system information other than MIB may be delivered on the BCH. In addition, CCCH is mapped to either DL-SCH or UL-SCH. In other words, RRC messages mapped to CCCH may be delivered on either DL-SCH or UL-SCH. In addition, the DCCH may be mapped to either the DL-SCH or the UL-SCH, i.e., an RRC message mapped to the DCCH may be delivered on either the DL-SCH or the UL-SCH.

[0198] The UL-SCH may be mapped to the PUSCH. The DL-SCH may be mapped to the PDSCH. BCH may be mapped to the PBCH.

[0199] The medium access control layer processing unit 15 may implement a random access procedure.

[0200] For example, downlink control information including a downlink grant or an uplink grant is transmitted and received on a PDCCH, including a C-RNTI (Cell-Radio Network Temporary Identifier).

[0201] One physical channel may be mapped to one serving cell. One physical channel may be mapped to one BWP configured on one carrier included in one serving cell. It may be possible to

[0202] One or more control resource sets (CORESET: Control Resource SET) may be configured in the terminal device 1. The terminal device 1 may transmit a 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 the PDCCH may include one or more PDCCH candidates and The PDCCH monitoring may also include a set of PDCCH and / or PDCCH candidates. and / or monitoring and detecting the DCI format transmitted via the PDCCH.

[0203] A plurality of control resource sets may be configured in the terminal device 1, and an index (control resource set index) may be assigned to each control resource set. One or more control channel elements (CCEs) may be configured in the control resource set, and an index (CCE index) may be assigned to each CCE.

[0204] The set of PDCCH candidates monitored by the terminal device 1 is defined in terms of a search space. The set of candidates is given by the search space.

[0205] The search space may be configured to include one or more PDCCH candidates of one or more aggregation levels. The aggregation level of the PDCCH candidates is determined by the number of CCEs constituting the PDCCH. The PDDCH candidates may be mapped to one or more CCEs.

[0206] The search area set may be configured to include at least one or more search areas, and an index (search area index) may be assigned to each search area.

[0207] Each search space set may be associated with at least one control resource set. Each search space set may be included in one control resource set. Each search space set may be given an index of the control resource set associated with that search space set.

[0208] The terminal device 1 performs blind search for PDCCH candidates included in a search space in a control resource set. By transmitting the PDCCH and / or DCI for the terminal device 1, it is possible to detect the PDCCH and / or DCI for the terminal device 1.

[0209] In various aspects of the present embodiment, unless otherwise specified, the number of resource blocks refers to the number of resource blocks in the frequency domain.

[0210] The terminal device 1 transmits uplink control information (UCI) to the base station device 3. The terminal device 1 may multiplex the UCI onto the PUCCH and transmit the UCI. The terminal device 1 may multiplex the UCI onto the PUSCH and transmit the UCI. The UCI may include at least one of downlink channel state information (CSI), a scheduling request (SR) indicating a request for PUSCH resources, and a hybrid automatic repeat request ACKnowledgement (HARQ-ACK) for downlink data (Transport block, Medium Access Control Protocol Data Unit: MAC PDU, Downlink-Shared Channel: DL-SCH, Physical Downlink Shared Channel: PDSCH).

[0211] HARQ-ACK is also known 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. It may also be called.

[0212] If the downlink data is successfully decoded, an ACK for the downlink data is generated. If the downlink data is not successfully decoded, a NACK for the downlink data is generated. The HARQ-ACK may include at least a HARQ-ACK bit corresponding to at least one transport block. The HARQ-ACK bit may indicate an ACK (ACKnowledgement) or a NACK (Negative-ACKnowledgement) corresponding to one or multiple transport blocks. The HARQ-ACK may include at least a HARQ-ACK codebook including one or multiple HARQ-ACK bits. The HARQ-ACK bit corresponding to one or multiple transport blocks may correspond to a PDSCH including the one or multiple transport blocks.

[0213] HARQ control for one transport block may be called an HARQ process. One HARQ process identifier may be assigned to each HARQ process. It includes a field indicating a process identifier (HARQ process number).

[0214] An NDI (New Data Indicator) is indicated in the DCI format for each HARQ process. For example, an NDI field is included in a DCI format (DL assignment) including scheduling information for PDSCH. The NDI field is 1 bit. The terminal device 1 stores (stores) an NDI value for each HARQ process. The base station device 3 stores (stores) an NDI value for each HARQ process for each terminal device 1. The terminal device 1 updates the stored NDI value using the NDI field of the detected DCI format. The base station device 3 sets the updated NDI value or the NDI value that is not updated in the NDI field of the DCI format and transmits it to the terminal device 1. The terminal device 1 updates the stored NDI value using the NDI field of the detected DCI format for the HARQ process corresponding to the value of the HARQ process identifier field of the detected DCI format.

[0215] The terminal device 1 receives the data based on the value of the NDI field in the DCI format (DL assignment). The terminal device 1 determines whether the received transport block is a new transmission or a retransmission. ... When the base station device 3 transmits a transport block for new transmission in a certain HARQ process, it toggles the value of the NDI stored for that HARQ process and transmits the toggled NDI to the terminal device 1. When the base station device 3 transmits a transport block for retransmission in a certain HARQ process, it does not toggle the value of the NDI stored for that HARQ process and transmits an untoggled NDI to the terminal device 1. When the terminal device 1 compares the value of the NDI field of the detected DCI format with the value of the NDI previously received for a transport block of a certain HARQ process, it determines that the received transport block is a retransmission. Note that toggling here means switching to a different value.

[0216] The terminal device 1 transmits HARQ-ACK information in a slot indicated by the value of the HARQ indication field included in DCI format 1_0 or DCI format 1_1 corresponding to PDSCH reception. may be reported to the base station device 3 using a HARQ-ACK codebook.

[0217] For DCI format 1_0, the value of the HARQ indication 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 indication field may be mapped to a set of slot numbers given by the higher layer parameter dl-DataToUL-ACK. The number of slots indicated based at least on the value of the HARQ indication field may also be referred to as HARQ-ACK timing or K1. For example, a HARQ-ACK indicating the decoding status of PDSCH (downlink data) transmitted in slot n may be reported (transmitted) in slot n+K1.

[0218] dl-DataToUL-ACK indicates a list of timings of HARQ-ACK for PDSCH. The timing is the slot in which HARQ-ACK for the received PDSCH is transmitted, based on the slot in which the PDSCH is received (or the slot containing the last OFDM symbol to which the PDSCH is mapped). For example, dl-DataToUL-ACK can be 1, 2, or 3. If DL-DataToUL-ACK is a list of 1 timing, the HARQ indication field is 0 bit. If DL-DataToUL-ACK is a list of two timings, the HARQ indication field The field is 1 bit. If Dl-DataToUL-ACK is a list of 3 or 4 timings, If there are 5 or 6 DL-DataToUL-ACKs, or For example, the dl-DataToUL-ACK consists of a list of timings with a value ranging from 0 to 31. For example, the dl-DataToUL-ACK consists of a list of timings with a value ranging from 0 to 63.

[0219] The size of the dl-DataToUL-ACK is defined as the number of elements it contains. para The index of the DL-DataToUL-ACK indicates the order (number) of the elements of the DL-DataToUL-ACK. For example, if the size of the DL-DataToUL-ACK is 8 (L para = 8), the indices of dl-DataToUL-ACK are 1, 2, 3, 4, The value is either 5, 6, 7, or 8. The index of DL-DataToUL-ACK is It may be given, indicated, or indicated by the value indicated by the indication field.

[0220] The terminal device 1 may set the size of the HARQ-ACK codebook according to the size of the dl-DataToUL-ACK. For example, if the dl-DataToUL-ACK consists of eight elements, the size of the HARQ-ACK codebook is 8. For example, if the dl-DataToUL-ACK consists of two elements, the size of the HARQ-ACK codebook is 2. Each piece of HARQ-ACK information constituting the HARQ-ACK codebook is HARQ-ACK information for PDSCH reception at each slot timing of the dl-DataToUL-ACK. This type of HARQ-ACK codebook is also called a semi-static HARQ-ACK codebook.

[0221] The terminal device 1 may report HARQ-ACK information for PDSCH reception in slot n by transmitting a PUCCH and / or a PUSCH in slot n+k, where k is the number of PDSCHs for the PDSCH reception. of the slot indicated by the HARQ indication field included in the corresponding DCI format. Alternatively, if the HARQ indication field is not included in the DCI format, k may be given by the higher layer parameter dl-DataToUL-ACK.

[0222] The terminal device 1 transmits corresponding HARQ-ACK information in the PUCCH of a certain slot. The terminal device 1 determines a set of multiple opportunities for candidate PDSCH reception. The terminal device 1 determines a set of multiple slots of slot timing K1 included in dl-DataToUL-ACK as multiple opportunities for candidate PDSCH reception. K1 may be a set of k. For example, if dl-DataToUL-ACK is (1, 2, 3, 4, 5, 6, 7, 8), the PUCCH in slot n receives the PDSCH in slot n-1, and the PDSCH in slot n-2. HARQ-ACK information is transmitted for the PDSCH reception in slot n-1, the PDSCH reception in slot n-2, the PDSCH reception in slot n-3, the PDSCH reception in slot n-4, the PDSCH reception in slot n-5, the PDSCH reception in slot n-6, the PDSCH reception in slot n-7, and the PDSCH reception in slot n-8. When the terminal device 1 actually receives a PDSCH in a slot corresponding to the candidate PDSCH reception, the terminal device 1 transmits HARQ-ACK information for the PDSCH reception in slot n-1, the PDSCH reception in slot n-2, the PDSCH reception in slot n-3, the PDSCH reception in slot n-4, the PDSCH reception in slot n-5, the PDSCH reception in slot n-6, the PDSCH reception in slot n-7, and the PDSCH reception in slot n-8. If a PDSCH is not received in the slot corresponding to the candidate PDSCH reception, NACK is set as the HARQ-ACK information. do.

[0223] The HARQ-ACK codebook may be based on at least some or all of the set of monitoring occasions for PDCCH, the value of the counter DAI field, etc. The HARQ-ACK codebook may be given based on the value of the UL DAI field. The HARQ-ACK codebook may be given based on the value of the DAI field. The credit may be given based on the value of the Total DAI field.

[0224] The size of the HARQ-ACK codebook is determined by the counter DAI frame of the last received DCI format. The size of the HARQ-ACK codebook may be set based on the value of the Total DAI field of the DCI format. The Counter DAI field indicates the cumulative number of PDSCHs or transport blocks scheduled until reception of the corresponding DCI format. The size of the HARQ-ACK codebook may be set based on the value of the Total DAI field of the DCI format. The Total DAI field indicates the total number of PDSCHs or transport blocks scheduled until transmission of the HARQ-ACK codebook.

[0225] The terminal device 1 determines a set of PDCCH monitoring opportunities for HARQ-ACK information transmitted in a PUCCH arranged in a slot of index n (slot #n) based on the value of timing K1 and the slot The PDCCH monitoring for HARQ-ACK information transmitted in a PUCCH located in a slot with index n may be determined based at least in part or in whole on the value of the slot offset K0. The set of monitoring occasions is also referred to as a set of PDCCH monitoring occasions for slot n (monitoring occasion for PDCCH for slot #n). Here, the set of PDCCH monitoring occasions includes M PDCCH monitoring occasions. For example, the slot offset K0 may be indicated based at least on the value of a time domain resource allocation field included in a downlink DCI format. The slot offset K0 is a value indicating the number of slots (slot difference) from the slot including the last OFDM symbol in which a PDCCH including a DCI format including a time domain resource allocation field indicating the slot offset K0 is arranged to the first OFDM symbol of a PDSCH scheduled by the DCI format.

[0226] A PDCCH signal detected in a monitoring opportunity of any of the search space sets corresponding to a certain PDCCH monitoring opportunity is If a DCI format detected in a monitoring opportunity of a search space set corresponding to a certain PDCCH monitoring opportunity triggers (contains triggering information) transmission of HARQ-ACK information in slot n, the terminal device 1 may determine the PDCCH monitoring opportunity as a PDCCH monitoring opportunity for slot n. Also, if a DCI format detected in a monitoring opportunity of a search space set corresponding to a certain PDCCH monitoring opportunity does not trigger (contains triggering information) transmission of HARQ-ACK information in slot n, the terminal device 1 may not determine the PDCCH monitoring opportunity as a PDCCH monitoring opportunity for slot n. Also, if no DCI format is detected in a monitoring opportunity of a search space set corresponding to a certain PDCCH monitoring opportunity, the terminal device 1 may not determine the PDCCH monitoring opportunity as a PDCCH monitoring opportunity for slot n.

[0227] Counter DAI may be a cumulative number (or a value at least related to the cumulative number) of PDCCHs detected up to a PDCCH monitoring opportunity in a serving cell among M PDCCH monitoring opportunities. Counter DAI may also be referred to as 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 is the sum of the number of PDCCH monitoring opportunities up to PDCCH monitoring opportunity m among M PDCCH monitoring opportunities. The cumulative number of PDCCHs detected in The total DAI is called T-DAI (Total Downlink Assignment Index). This may be done.

[0228] A DCI format switching process according to the number of activated cells (component carriers) in one embodiment of the present invention will be described.

[0229] The multi-cell DCI format schedules data to activated cells. The multi-cell DCI format contains the scheduling data for the number of activated cells. For example, if the number of activated cells is 10, the multi-cell DCI frame is The format contains data scheduling information for 10 cells. For example, if the number of activated cells is 5, the multi-cell DCI format contains data scheduling information for the 5 cells. If the number of activated cells is one, the multi-cell DCI format includes scheduling information for data for one cell. Note that if the number of activated cells is one, the multi-cell DCI format is not used. In any case, a DCI format for single-cell scheduling may be used.

[0230] The number of cells containing data scheduling information in the multi-cell DCI format The base station device 3 performs coding processing according to the size of the multi-cell DCI format and transmits the multi-cell DCI format to the terminal device 1 using the PDCCH. The terminal device 1 performs decoding processing according to the size of the multi-cell DCI format to be decoded. The base station device 3 performs a detection process on the received PDCCH to detect the multi-cell DCI format. The base station device 3 detects the multi-cell DCI format in accordance with the number of activated cells in the terminal device 1. The terminal device 1 determines the number of scheduling information pieces for data for cells included in the multi-cell DCI format according to the number of cells activated in the terminal device 1. The number of scheduling information pieces of data for the cells contained in the packet is determined.

[0231] The number of activated cells may be grouped, and a different multi-cell DCI format may be used for each group (multiple activated cells). A group of 6 to 10 cells is used, and a multi-cell DCI format containing data scheduling information for the 10 cells is used for this group. For example, two to five activated cells may be defined as one group, and a multi-cell DCI format including scheduling information for data for the five cells may be used for this group. In this case, the terminal device 1 performs a multi-cell DCI format switching process when the number of activated cells changes from six or more to five or less, or from five or less to six or more. Here, the multi-cell DCI format switching process is not limited to a process of switching to a multi-cell DCI format with a different name, but also includes a process of changing the number of scheduling information pieces included in a multi-cell DCI format with the same name. Here, the multi-cell DCI format switching process is not limited to a process of switching to a multi-cell DCI format with a different name, but also includes a process of changing to a multi-cell DCI format with the same name but with a different size.

[0232] A process of switching search areas according to the number of activated cells (component carriers) in one embodiment of the present invention will be described.

[0233] Multi-cell DCI format switching process is performed depending on the number of activated cells. At the same time, the search area is switched. The size of the multi-cell DCI format varies depending on the number of activated cells, and the search area set considering this size is used. The number of activated cells is large and the size of the multi-cell DCI format is large. As the number of activated cells decreases and the size of the multi-cell DCI format decreases, a search space including PDCCH candidates with a higher aggregation level is used. As the number of activated cells decreases and the size of the multi-cell DCI format decreases, a search space including PDCCH candidates with a lower aggregation level is used. As the number of activated cells increases and the size of the multi-cell DCI format increases, a search space including a higher number of PDCCH candidates with a higher aggregation level and a lower number of PDCCH candidates with a lower aggregation level is used. As the number of activated cells decreases and the size of the multi-cell DCI format decreases, a search space including a higher number of PDCCH candidates with a lower aggregation level and a lower number of PDCCH candidates with a higher aggregation level is used. The terminal device 1 switches the search space depending on the number of activated cells and performs PDCCH monitoring. The base station device 3 switches the search space depending on the number of activated cells and transmits the PDCCH.

[0234] For example, a search space (search space 10) used when the number of activated cells is 10 may be configured with two PDCCH candidates with aggregation level 4, four PDCCH candidates with aggregation level 8, and four PDCCH candidates with aggregation level 16. The search space (search space 5) used when the number of cells is five may be configured with six PDCCH candidates with aggregation level 4, four PDCCH candidates with aggregation level 8, and two PDCCH candidates with aggregation level 16. For example, the search space (search space 5) used when the number of activated cells is five may be configured with two PDCCH candidates with aggregation level 2, four PDCCH candidates with aggregation level 4, and two PDCCH candidates with aggregation level 8. In this way, PDCCH candidates with a high aggregation level may be configured for the search space used when the number of activated cells is large, and PDCCH candidates with a low aggregation level may be configured for the search space used when the number of activated cells is small. In this way, PDCCH candidates with a high aggregation level may be configured for the search space used when the number of activated cells is large, and PDCCH candidates with a high aggregation level may not be configured for the search space used when the number of activated cells is small. In this way, PDCCH candidates with low aggregation levels may not be configured in a search space used when the number of activated cells is large, and PDCCH candidates with low aggregation levels may be configured in a search space used when the number of activated cells is small.In this way, a large number of PDCCH candidates with high aggregation levels may be configured in a search space used when the number of activated cells is large, and a small number of PDCCH candidates with high aggregation levels may be configured in a search space used when the number of activated cells is small.In this way, the number of PDCCH candidates with low aggregation levels may be configured small for the search space used when the number of activated cells is large, and the number of PDCCH candidates with low aggregation levels may be configured large for the search space used when the number of activated cells is small.

[0235] Different search regions may be used for the multi-cell DCI format and the DCI format for single-cell scheduling. When the number of activated cells is one, the search region set for the multi-cell DCI format is switched to the DCI format for single-cell scheduling. Even if the search space configured for the DCI format for scheduling of the good.

[0236] The number of activated cells may be grouped, and a different search area may be used for each group. For example, the number of activated cells may be 6 to 10 as one group, and the number of activated cells may be 2 to 5 as another group, and a different search area may be used for each group. In this case, the terminal device 1 performs a search area switching process when the number of activated cells changes from 6 or more to 5 or less, or from 5 or less to 6 or more. In this case, the base station device 3 performs a search area switching process for the terminal device 1 when the number of activated cells changes from 6 or more to 5 or less, or from 5 or less to 6 or more.

[0237] 5 is a diagram showing an example of a process of switching a multi-cell DCI format in accordance with the number of activated cells of the terminal device 1 according to one aspect of the present embodiment. The layer processing unit (MAC layer processing unit) 15 determines the number of activated cells (step S101). The medium access control layer processing unit (MAC layer processing unit) 15 of the terminal device 1 determines the number of activated cells. If the media access control layer processing unit (MAC layer processing unit) 15 of the terminal device 1 determines that the number of activated cells is to be changed (step S102), Step S102: YES), the multi-cell DCI form that is monitored for the wireless transceiver unit 10 If the media access control layer processing unit (MAC layer processing unit) 15 of the terminal device 1 determines that the number of activated cells is not to be changed (step S103), If the terminal 10 determines that the multi-cell DCI format to be monitored is not to be switched (step S102: NO), the terminal 100 controls the radio transmitting / receiving unit 10 not to switch the multi-cell DCI format to be monitored (step S104).

[0238] 6 is a diagram showing an example of a process of switching a search area according to the number of activated cells of the terminal device 1 according to one aspect of the present embodiment. The medium access control layer processing unit (MAC layer processing unit) 15 of the terminal device 1 determines the number of activated cells (step S201). The medium access control layer processing unit (MAC layer processing unit) 15 of the terminal device 1 determines whether the number of activated cells is to be changed (step S202). If the medium access control layer processing unit (MAC layer processing unit) 15 of the terminal device 1 determines that the number of activated cells is to be changed (step S202: YES), it controls the wireless transceiver unit 10 to switch the search area to be monitored (step S203). If the medium access control layer processing unit (MAC layer processing unit) 15 of the terminal device 1 determines that the number of activated cells is not to be changed (step S202: NO), it controls the wireless transceiver unit 10 not to switch the search area to be monitored (step S204).

[0239] As described above, the present invention aims to efficiently transmit and receive PDCCH between the terminal device 1 and the base station device 3. The present invention can efficiently perform the DCI frame with the required amount of information depending on the number of activated cells. By controlling the format, efficient PDCCH transmission and reception between the terminal device 1 and the base station device 3 can be achieved. The large information content of the DCI format requires a high error rate to achieve the required error rate. This requires a large number of resources such as time-frequency resources, which is not efficient. The present invention controls the search space together with the DCI format according to the number of activated cells, thereby By using a search space including PDCCH candidates according to the size of the DCI format that changes, the terminal device can efficiently transmit and receive PDCCHs between the terminal device and the base station device 3. PDCCH transmission is performed using PDCCH candidates of optimal resources for PDCCH transmission and reception between the base station device 1 and the base station device 3. Reception can be performed.

[0240] The present invention relates to a method for implementing a mobile communication system that is activated using RRC signaling between a terminal device 1 and a base station device 3. By setting the search area for each cell in advance and switching the search area according to the number of activated cells, it is possible to control cell activation / deactivation in the MAC layer. Therefore, PDCCH transmission and reception can be realized.

[0241] The present invention uses RRC signaling between a terminal device 1 and a base station device 3 to perform multiple searches. A multi-cell DCI format is preset for each search area, and a multi-cell DCI format is preset for each search area. By setting the number of activated cells used for the search area in advance and switching the search area according to the number of activated cells, a multi-cell DCI format with an amount of information and size suitable for the number of activated cells and multiple PDCCH candidates suitable for that multi-cell DCI format can be obtained. This makes it possible to use the complement (Aggregation level of PDCCH candidates, number of PDCCH candidates for each aggregation level), thereby realizing efficient PDCCH transmission and reception.

[0242] The present invention is characterized in that the search space for monitoring the PDCCH using the multi-cell DCI format is switched depending on the number of activated cells. Activated cells for the search space for PDCCH monitoring using the format The number of one or more search spaces in which the PDCCH is monitored is changed depending on the number of For example, if the number of activated cells is five, the single-cell DCI frame is The search space for PDCCH monitoring using the format is set to 5 and activated. This is different from the present invention in that when the number of cells selected is two, the search space for monitoring the PDCCH using the single-cell DCI format is set to two.

[0243] The programs operating in the base station device 3 and terminal device 1 according to the present invention may be programs (programs that make a computer function) that control a CPU (Central Processing Unit) or the like so as to realize the functions of the above-described embodiments according to the present invention. Information handled by these devices is temporarily stored in RAM (Random Access Memory) during processing. Then, various ROMs such as Flash ROM (Read Only Memory) and HDD (Hard Disk Drive) The data is stored in the , and is read, modified, and written by the CPU as needed.

[0244] Note that the terminal device 1 and part of the base station device 3 in the above-described embodiment may be realized by a computer. In this case, a program for realizing this control function may be recorded on a computer-readable recording medium, and the program recorded on this recording medium may be read into a computer system and executed to realize the control function.

[0245] The term "computer system" used here refers to a computer system built into the terminal device 1 or base station device 3, and includes hardware such as an OS and peripheral devices. Also, the term "computer-readable recording medium" refers to portable media such as flexible disks, optical magnetic disks, ROMs, and CD-ROMs, as well as storage devices such as hard disks built into the computer system.

[0246] Furthermore, the term "computer-readable recording medium" may include a medium that dynamically stores a program for a short period of time, such as a communication line when transmitting a program via a network such as the Internet or a communication line such as a telephone line, or a medium that stores a program for a certain period of time, such as a volatile memory within a computer system that serves as a server or client in such a case. The program may also be one that realizes part of the above-mentioned functions, or one that can realize the above-mentioned functions in combination with a program already recorded in the computer system.

[0247] The terminal device 1 may comprise at least one processor and at least one memory containing computer program instructions (computer programs). The memory and computer program instructions (computer programs) may be configured to cause the terminal device 1 to perform the operations and processes described in the above embodiments using the processor. The base station device 3 may comprise at least one processor and at least one memory containing computer program instructions (computer programs). The memory and computer program instructions (computer programs) may be configured to cause the base station device 3 to perform the operations and processes described in the above embodiments using the processor.

[0248] Furthermore, the base station device 3 in the above-described embodiment can also be realized as a collection (device group) consisting of multiple devices. Each of the devices constituting the device group may have some or all of the functions or functional blocks of the base station device 3 according to the above-described embodiment. It is sufficient for the device group to have all of the functions or functional blocks of the base station device 3. Furthermore, the terminal device 1 according to the above-described embodiment can also communicate with the base station device as a collection.

[0249] Furthermore, the base station device 3 in the above-described embodiments may be an EUTRAN (Evolved Universal Terrestrial Radio Access Network) and / or an NG-RAN (NextGen RAN, NR RAN). Furthermore, the base station device 3 in the above-described embodiments may have some or all of the functions of an upper node for an eNodeB and / or a gNB.

[0250] Furthermore, some or all of the terminal device 1 and base station device 3 in the above-described embodiments may be realized as an LSI, which is typically an integrated circuit, or may be realized as a chipset. Each functional block of the terminal device 1 and the base station device 3 may be individually integrated into a chip, or part or all of them may be integrated into a chip. The integrated circuit method is not limited to LSI, but may be a dedicated circuit, It may also be realized by a general-purpose processor. In addition, with the advancement of semiconductor technology, it may be replaced by an LSI. When integrated circuit technology emerges, it is also possible to use integrated circuits based on that technology.

[0251] Furthermore, in the above-described embodiment, a terminal device is described as an example of a communication device, but the present invention is not limited to this and can also be applied to terminal devices or communication devices such as stationary or non-movable electronic devices installed indoors or outdoors, for example, AV equipment, kitchen equipment, cleaning / washing equipment, air conditioning equipment, office equipment, vending machines, and other household appliances.

[0252] Although the embodiments of the present invention have been described in detail above with reference to the drawings, the specific configuration is not limited to this embodiment and includes design modifications within the scope of the invention. Furthermore, the present invention is susceptible to various modifications within the scope of the claims, and embodiments obtained by appropriately combining the technical means disclosed in different embodiments are also included in the technical scope of the present invention. Furthermore, configurations in which elements described in the above embodiments are substituted with elements that achieve the same effect are also included. [Explanation of symbols]

[0253] 1(1A, 1B, 1C) Terminal equipment 3(3A, 3B, 3C) Base station equipment 10, 30 Radio transmitter / receiver 11, 31 Antenna section 12, 32 RF section 13, 33 Baseband section 14, 34 Upper layer processing unit 15, 35 Medium access control layer processing unit 16, 36 Radio resource control layer processing unit

Claims

1. A terminal device comprising a processor and a memory for storing computer program code, Performing an operation including: setting one search space from a plurality of search spaces according to the number of activated cells; and monitoring a PDCCH in the set search space; a DCI format is set separately for each of the plurality of search areas; The DCI format includes scheduling information for data of multiple cells, The DCI format including scheduling information for data of different numbers of cells is set for different search areas; The search space used when the number of activated cells is large is configured to have a larger number of PDCCH candidates with a larger aggregation level than the search space used when the number of activated cells is small. Terminal device.

2. A communication method used in a terminal device, comprising: setting one search space from a plurality of search spaces according to the number of activated cells; and monitoring a PDCCH in the set search space; a DCI format is set separately for each of the plurality of search areas; The DCI format includes scheduling information for data of multiple cells, The DCI format including scheduling information for data of different numbers of cells is set for different search areas; The search space used when the number of activated cells is large is configured to have a larger number of PDCCH candidates with a larger aggregation level than the search space used when the number of activated cells is small. Communication method.

3. A base station device including a processor and a memory for storing computer program code, the base station device performing operations including: setting one of a plurality of search areas for a terminal device 1 according to the number of activated cells; and transmitting a PDCCH using PDCCH candidates included in the set search area; a DCI format is set separately for each of the plurality of search areas; The DCI format includes scheduling information for data of multiple cells, The DCI format including scheduling information for data of different numbers of cells is set for different search areas; The search space used when the number of activated cells is large is configured to have a larger number of PDCCH candidates with a larger aggregation level than the search space used when the number of activated cells is small. Base station equipment.

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