Terminal device and communication method

Abstract

In the present invention, in a cell in which on-demand system information transmission is supported, a wake-up signal is transmitted, a response to the wake-up signal is received, a master information block (MIB) is acquired after receiving the response, information regarding a physical downlink control channel (PDCCH) is acquired from the MIB, a system information block 1 (SIB1) is acquired on the basis of the information regarding the PDCCH, and a random access procedure is performed on the basis of information included in the SIB1.

Description

Terminal device and communication method

[0001] The present invention relates to a terminal device and a communication method. This application claims priority to Japanese Patent Application No. 2024-180456, filed in Japan on October 16, 2024, the contents of which are incorporated herein by reference.

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

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

[0004] 3GPP is exploring methods to reduce energy consumption in networks in order to minimize environmental impact and operational costs (Non-Patent Document 1). The majority of network energy consumption is in wireless access networks. Efforts are being made to reduce network energy consumption by shortening the time that base station equipment is transmitting or receiving signals and by increasing the time that base station equipment can be in a sleep state.

[0005] "New WID: Enhancements of network energy savings for NR", RP-234065, Ericsson, 3GPP TSG RAN Meeting #102, Edinburgh, Scotland, December 11th-15th, 2023

[0006] Support for on-demand transmission and reception of system information is being considered. Using a wake-up signal to trigger the transmission and reception of system information is being considered. Reducing the time it takes for base station equipment to transmit system information is being considered to reduce network energy consumption. In this context, one aspect of the present invention provides a terminal device capable of efficiently transmitting and receiving on-demand system information, and a communication method used in the terminal device.

[0007] (1) In order to achieve the above objective, one aspect of the present invention employs the following means. Specifically, the first aspect of the present invention is a terminal device comprising a processor and a memory for storing computer program code, which performs the following: transmitting a wake-up signal, receiving a response to the wake-up signal, obtaining an MIB after receiving the response, obtaining information about a PDCCH from the MIB, obtaining an SIB1 based on the information about the PDCCH, and performing a random access procedure based on the information contained in the SIB1.

[0008] (2) Furthermore, the information relating to the PDCCH includes at least information relating to the control resource set and information relating to the search area.

[0009] (3) Furthermore, after receiving the response, the information element pdcch-ConfigSIB1 is interpreted as indicating information about the PDCCH.

[0010] (4) A second aspect of the present invention is a communication method used in a terminal device, comprising the steps of: transmitting a wake-up signal; receiving a response to the wake-up signal; obtaining an MIB after receiving the response; obtaining information about a PDCCH from the MIB; obtaining an SIB1 based on the information about the PDCCH; and performing a random access procedure based on the information contained in the SIB1.

[0011] (5) Furthermore, the information relating to the PDCCH includes at least information relating to the control resource set and information relating to the search area.

[0012] (6) Furthermore, after receiving the response, the information element pdcch-ConfigSIB1 is interpreted as indicating information about the PDCCH.

[0013] According to one aspect of this invention, on-demand transmission and reception of system information can be efficiently performed between terminal devices and base station devices. As a result, network energy consumption can be reduced.

[0014] This is a conceptual diagram of a wireless communication system according to one aspect of this embodiment. This is a schematic diagram showing an example of a resource grid in a subframe according to one aspect of this embodiment. This is a schematic block diagram showing the configuration of a terminal device 1 according to one aspect of this embodiment. This is a schematic block diagram showing the configuration of a base station device 3 according to one aspect of this embodiment. This is a diagram showing an example of an initial connection procedure according to one aspect of this embodiment. This is a diagram showing an example of the process of acquiring an MIB after receiving a response to a wake-up signal according to one aspect of this embodiment.

[0015] The following describes this embodiment.

[0016] "A, and / or B" may be a term that includes "A", "B", or "A and B".

[0017] A parameter or piece of information may have one or more values, meaning that the parameter or information may include at least one parameter or piece of information that has those one or more values. A top-level parameter may be a single top-level parameter. A top-level parameter may be an information element (IE) that includes multiple parameters.

[0018] Figure 1 is a conceptual diagram of a wireless communication system according to one embodiment of this model. In Figure 1, the wireless communication system comprises terminal devices 1A to 1B and base station devices 3A to 3C. Hereinafter, terminal devices 1A to 1B will also be referred to as terminal device 1 (UE). Hereinafter, base station devices 3A to 3C will also be referred to as base station device 3 (gNB). Base station devices 3A and 3B use different frequencies. For example, base station device 3A uses a low-band frequency, while base station devices 3B and 3C use high-band frequencies. The coverage of base station device 3B is configured within the coverage of base station device 3A. The coverage of base station device 3C is configured within the coverage of base station device 3A. Base station device 3A constitutes a cell that continues to transmit periodic common signals (such as system information) without entering a sleep state. Base station device 3B enters a sleep state and configures a cell (referred to as a Network Energy Saving Cell: NES Cell) that transmits common signals (such as system information) on demand. Base station device 3C enters a sleep state and configures a cell (referred to as a Network Energy Saving Cell: NES Cell) that transmits common signals (such as system information) on demand. The cell configured by base station device 3A may be referred to as a coverage cell. The cells configured by base station device 3B and base station device 3C may be referred to as capacity cells.

[0019] Terminal device 1A transmits a wake-up signal to base station device 3B, triggering base station device 3B to transmit on-demand system information. Terminal device 1A receives information about the wake-up signal (information about the configuration of the wake-up signal) from base station device 3A. Base station device 3B detects the wake-up signal transmitted from terminal device 1A and transmits on-demand system information. Terminal device 1B transmits a wake-up signal to base station device 3C, triggering base station device 3C to transmit on-demand system information. Terminal device 1B receives information about the wake-up signal (information about the configuration of the wake-up signal) from base station device 3A. Base station device 3C detects the wake-up signal transmitted from terminal device 1B and transmits on-demand system information. Base station device 3A may transmit the information about the wake-up signal as system information. Base station device 3A may transmit the information about the wake-up signal as a system information block.

[0020] Base station equipment 3A and base station equipment 3B are connected by wire or wireless and exchange information and cooperate. Base station equipment 3B may notify base station equipment 3A of information regarding the wake-up signal configuration. Base station equipment 3B may notify base station equipment 3A of information regarding the updated wake-up signal configuration. Base station equipment 3A may notify base station equipment 3B of information regarding the updated wake-up signal configuration. Base station equipment 3B may notify terminal equipment 1A in the coverage of information indicating that the wake-up signal configuration has been updated.

[0021] Base station equipment 3A and base station equipment 3C are connected by wire or wireless and communicate and cooperate by exchanging information. Base station equipment 3C may notify base station equipment 3A of information regarding the wake-up signal configuration. Base station equipment 3C may notify base station equipment 3A of information regarding the updated wake-up signal configuration. Base station equipment 3A may notify base station equipment 3C of information regarding the updated wake-up signal configuration.

[0022] Base station device 3 may transmit on-demand system information for a specific period of time. Base station device 3 may stop transmitting on-demand system information if it determines that terminal device 1 has moved outside of coverage.

[0023] Information regarding the wake-up signal includes information regarding the wake-up signal's resources. At least one of the following is included in the wake-up signal information: information regarding the wake-up signal's time resources, information regarding its frequency resources, and information regarding its code resources. Information regarding the wake-up signal may also include information regarding the corresponding cell's cell ID, cell frequency (ARFCN: Absolute radio-frequency channel number), uplink BWP frequency bandwidth and frequency position, TDD frame configuration (uplink and downlink frame configuration), transmit power parameters, control resource set / search space, etc.

[0024] The wake-up signal may use the same configuration as the random access channel signal.

[0025] The base station device 3 may be configured to include one or both of an MCG (Master Cell Group) and an SCG (Secondary Cell Group). An MCG is a group of serving cells comprising at least a PCell (Primary Cell). An SCG is a group of serving cells comprising at least a PSCell (Primary Secondary Cell). A PCell may be a serving cell given based on the initial connection. An MCG may be configured to include one or more SCells (Secondary Cells). An SCG may be configured to include one or more SCells. A serving cell identity is a short identifier for identifying a serving cell. A serving cell identity may be given by a higher-layer parameter.

[0026] In a wireless communication system, the terminal device 1 and the base station device 3 may use one or more communication methods. For example, in the downlink of the wireless communication system, CP-OFDM (Cyclic Prefix-Orthogonal Frequency Division Multiplex) may be used. Also, in the uplink of the wireless communication system, either CP-OFDM or DFT-s-OFDM (Discrete Fourier Transform-spread-Orthogonal Frequency Division Multiplex) may be used. Here, DFT-s-OFDM is a communication method in which transform precoding is applied prior to signal generation in CP-OFDM. Here, transform precoding is also referred to as DFT precoding.

[0027] As shown in FIG. 1, the base station device 3 may be composed of one transceiver device (or a transmission point, a transmission device, a reception point, a reception device, a transceiver point). On the other hand, in some cases, the base station device 3 may be configured to include a plurality of transceiver devices. When the base station device 3 is composed of a plurality of transceiver devices, each of the plurality of transceiver devices may be arranged at geographically different positions.

[0028] The subcarrier spacing (SCS: SubCarrier Spacing) Δf for a certain subcarrier spacing setting μ may be Δf = 2 μ × 15 kHz. For example, the subcarrier spacing setting μ may indicate any one of 0, 1, 2, 3, 4.

[0029] The time unit (time unit) T ｃ = 1 / (Δf ｍａｘ × N ｆ ) may be used for expressing the length in the time domain. Here, Δf ｍａｘ = 480 kHz may be used. Also, N ｆ = 4096 may be used. Also, the constant κ is κ = Δf ｍａｘ × N ｆ / (Δf ｒｅｆ N ｆ，ｒｅｆ) = 64 is also acceptable. Also, Δf ｒｅｆ The frequency may be 15 kHz. ｆ，ｒｅｆ The answer is 2048.

[0030] 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.

[0031] A wireless frame may consist of 10 subframes. Here, the length of a subframe may be Tsf = (Δfmax × Nf / 1000) × Ts = 1 ms. Also, the number of OFDM symbols per subframe may be Nsubframe, μsymb = Nslotsymb × Nsubframe, μslot.

[0032] OFDM symbols are used as time-domain units for communication methods used in wireless communication systems. For example, OFDM symbols may be used as time-domain units for CP-OFDM. Furthermore, OFDM symbols may be used as time-domain units for DFT-s-OFDM.

[0033] A slot may consist of multiple OFDM symbols. For example, one slot may consist of Nslotsymb consecutive OFDM symbols. For instance, in a normal CP setting, Nslotsymb = 14. In an extended CP setting, Nslotsymb = 12.

[0034] Slots may be indexed in the time domain. For example, slot index nμs may be given in ascending order as integer values ​​in the range of 0 to Nsubframe,μslot-1 in subframes. Also, slot index nμs,f may be given in ascending order as integer values ​​in the range of 0 to Nframe,μslot-1 in wireless frames.

[0035] Figure 2 is a diagram showing a configuration example of a resource grid according to an aspect of the present embodiment. In the resource grid of Figure 2, the horizontal axis is the OFDM symbol index lsym, and the vertical axis is the subcarrier index ksc. The resource grid of Figure 2 includes Nsize, μgrid, x × NRBsc subcarriers and Nsubframe, μsymb OFDM symbols. Here, Nsize, μgrid, x indicates the bandwidth of the SCS-specific carrier. Also, the unit of the value of Nsize, μgrid, x is a resource block.

[0036] In the resource grid, the resource specified by the subcarrier index ksc and the OFDM symbol index lsym is also referred to as a resource element (RE).

[0037] A resource block (RB) includes NRBsc consecutive subcarriers. A resource block is a general term for a common resource block, a physical resource block (PRB), and a virtual resource block (VRB). For example, NRBsc = 12 may be used.

[0038] A BWP (BandWidth Part) may be configured as a subset of the resource grid. Here, the BWP set for the downlink is also referred to as the downlink BWP. The BWP set for the uplink is also referred to as the uplink BWP.

[0039] Hereinafter, a configuration example of the terminal device 1 according to an aspect of the present embodiment will be described.

[0040] FIG. 3 is a schematic block diagram showing the configuration of the terminal device 1 according to one aspect of the present embodiment. As shown in the figure, the terminal device 1 includes a wireless transmission / reception unit 10 and an upper layer processing unit 14. The wireless transmission / reception unit 10 is configured to include at least a part or all of an antenna unit 11, an RF (Radio Frequency) unit 12, and a baseband unit 13. The upper layer processing unit 14 is configured to include at least a part or all of a media access control layer processing unit 15 and a radio resource control layer processing unit 16. The wireless transmission / reception unit 10 is also referred to as a transmission unit, a reception unit, or a physical layer processing unit.

[0041] The wireless transmission / reception unit 10 performs processing of the physical layer.

[0042] For example, the wireless transmission / reception unit 10 may generate a baseband signal of an uplink physical channel. Here, the transport block delivered from the upper layer on the UL-SCH may be arranged on the uplink physical channel. For example, the wireless transmission / reception unit 10 may generate a baseband signal of an uplink physical signal.

[0043] For example, the wireless transmission / reception unit 10 may attempt to detect information transmitted by a downlink physical channel. Here, the transport block among the information transmitted by the downlink physical channel may be delivered to the upper layer on the DL-SCH. For example, the wireless transmission / reception unit 10 may attempt to detect information transmitted by a downlink physical signal.

[0044] The reception unit of the terminal device 1 receives the PDCCH. The reception processing unit of the terminal device 1 performs processing of receiving the PDCCH in a downlink 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 unit processing of the terminal device 1 performs processing of receiving the PDCCH and performs processing of detecting downlink control information (DCI format). The reception unit processing of the terminal device 1 decodes the information included in the detected DCI format and outputs the decoding result to each unit.

[0045] The receiving unit (receiving processing unit) of terminal device 1 receives the PDSCH. The receiving unit of terminal device 1 performs processing to receive the PDSCH in the downlink frequency band (cell, component carrier, carrier). The receiving unit of terminal device 1 performs demodulation, decoding, and other processing on the PDSCH. The receiving unit of terminal device 1 receives MAC CE via the PDSCH. The receiving unit of terminal device 1 decodes the information contained in the received MAC CE and outputs the decoded result to each unit. The receiving unit of terminal device 1 receives RRC signaling via the PDSCH. The receiving unit of terminal device 1 outputs the received RRC signaling to the upper layer processing unit 14.

[0046] The receiving unit of terminal device 1 receives system information via PDSCH. The receiving unit of terminal device 1 outputs the received system information to the upper layer processing unit 14. The receiving unit of terminal device 1 receives on-demand system information via PDSCH. The receiving unit of terminal device 1 outputs the received on-demand system information to the upper layer processing unit 14. The receiving unit of terminal device 1 receives information regarding the wake-up signal via PDSCH. The receiving unit of terminal device 1 may also receive information regarding the wake-up signal included in the system information. The receiving unit of terminal device 1 receives signals from multiple base station devices 3. The receiving unit of terminal device 1 receives signals from multiple base station devices 3 at different frequencies.

[0047] Information regarding the wake-up signal includes at least information indicating the wake-up signal resources. Wake-up signal resources mean at least one of the following: time resources (radio frames, subframes, OFDM symbols) (period, offset, interval), frequency resources (BWP, resource blocks) (start position, number), and code resources (preamble, sequence).

[0048] There may be multiple pieces of information regarding a wake-up signal. Information regarding a single wake-up signal may include multiple pieces of information indicating the wake-up signal resource. For example, information indicating two wake-up signal resources (WakeUp signal configuration #1, WakeUp signal configuration #2) may be configured. Each piece of information regarding a wake-up signal includes information identifying the corresponding cell, such as a cell ID. The information indicating the resource of each wake-up signal is associated with information identifying the corresponding cell, such as a cell ID. For example, terminal device 1 selects either the cell corresponding to WakeUp signal configuration #1 or the cell corresponding to WakeUp signal configuration #2 and transmits the wake-up signal. For example, terminal device 1 cannot select the cell corresponding to WakeUp signal configuration #1 and instead selects the cell corresponding to WakeUp signal configuration #2 and transmits the wake-up signal. For example, terminal device 1 cannot select both the cell corresponding to WakeUp signal configuration #1 and the cell corresponding to WakeUp signal configuration #2 and therefore does not transmit a wake-up signal.

[0049] The receiving unit of terminal device 1 receives the PBCH. The receiving unit of terminal device 1 receives the MIB. The receiving unit of terminal device 1 receives the MIB via the PBCH. PBCH is the name of the channel. MIB is the name of the information element. The receiving unit of terminal device 1 receives information about the PDCCH (pdcch-ConfigSIB1) via the MIB of the PBCH. The information about the PDCCH includes information about the control resource set (controlResourceSetZero). The information about the control resource set may include at least a portion of the information regarding the number of resource blocks constituting the control resource set, the number of symbols in the control resource set, the position (offset) of the resource blocks constituting the control resource blocks, and the multiplexing pattern of the SSB and the control resource set. The information about the PDCCH includes information about the search space (searchSpaceZero). The information about the search space may include at least a portion of the information regarding the slots that constitute the search space and the symbols that constitute the search space. The information about the PDCCH is information about the PDCCH that schedules on-demand system information. The PDCCH information is information about PDCCH that schedules PDSCH, including on-demand system information.

[0050] The receiving unit of terminal device 1 receives information regarding the GSCN (Global Synchronization Channel Number) in the MIB of the PBCH. The information regarding the GSCN may also be information regarding the offset from a reference GSCN. The reference GSCN may be the GSCN on which the SSB is detected. The information regarding the GSCN is information regarding the GSCN of the cell on which the wake-up signal information is provided. The receiving unit of terminal device 1 receives the information regarding the GSCN (Global Synchronization Channel Number) by reinterpreting the PDCCH information (pdcch-ConfigSIB1) in the MIB. Terminal device 1 reinterprets the PDCCH information (pdcch-ConfigSIB1) in the MIB when predetermined information (ssb-SubcarrierOffset) included in the MIB indicates a specific value. The predetermined information (ssb-SubcarrierOffset) also indicates the value of the frequency domain offset on a subcarrier basis between the SSB and the resource block grid. The predetermined information (ssb-SubcarrierOffset) may also indicate that SIB1 is provided. The predetermined information (ssb-SubcarrierOffset) indicates that SIB1 is provided by showing the value of the frequency domain offset per subcarrier between the SSB and the resource block grid. The predetermined information (ssb-SubcarrierOffset) may also indicate that SIB1 is not provided. The predetermined information (ssb-SubcarrierOffset) does not show the value of the frequency domain offset per subcarrier between the SSB and the resource block grid, indicating that SIB1 is not provided. The predetermined information (ssb-SubcarrierOffset) may also indicate that on-demand SIB1 is provided. The predetermined information (ssb-SubcarrierOffset) does not show the value of the frequency domain offset per subcarrier between the SSB and the resource block grid, indicating that on-demand SIB1 is provided.

[0051] If the predetermined information (ssb-SubcarrierOffset) indicates a value different from either a value indicating a frequency domain offset on a subcarrier basis between the SSB and the resource block grid (a value indicating that SIB1 is provided) or a value indicating that SIB1 is not provided, the terminal device 1 interprets the MIB's PDCCH information (pdcch-ConfigSIB1) as indicating GSCN information. In other words, the predetermined information (ssb-SubcarrierOffset) is set to a value indicating that on-demand SIB1 is provided. If the predetermined information (ssb-SubcarrierOffset) indicates a value different from either a value indicating a frequency domain offset on a subcarrier basis between the SSB and the resource block grid or a value indicating that SIB1 is not provided, the terminal device 1 interprets the MIB's PDCCH information (pdcch-ConfigSIB1) as indicating GSCN information for a cell that provides wake-up signal information. Based on the received GSCN information, the terminal device 1 detects the cell that provides wake-up signal information and receives the wake-up signal information. If the predetermined information (ssb-SubcarrierOffset) indicates a value representing the frequency domain offset on a subcarrier basis between the SSB and the resource block grid, terminal device 1 interprets the MIB's PDCCH information (pdcch-ConfigSIB1) as representing information about the control resource set and the search area. If the predetermined information (ssb-SubcarrierOffset) indicates a value representing that SIB1 is not provided, terminal device 1 interprets the MIB's PDCCH information (pdcch-ConfigSIB1) as representing information about the GSCN of the cell that provides SIB1.

[0052] If SIB1 is to be provided in the relevant cell, the first value is set in the specified information (ssb-SubcarrierOffset). If SIB1 is to be provided in another cell, the second value is set in the specified information (ssb-SubcarrierOffset). If on-demand SIB1 is to be provided in the relevant cell, the third value is set in the specified information (ssb-SubcarrierOffset).

[0053] The receiving unit of terminal device 1 receives a response to the wake-up signal. The base station device 3 transmits a response to the detected wake-up signal. The response to the wake-up signal indicates that the base station device 3 has detected the wake-up signal. The response to the wake-up signal may be received via PDSCH. The response to the wake-up signal may be MAC CE. The response to the wake-up signal may use a PDCCH that includes a DCI format scrambled with a specific RNTI. The receiving unit of terminal device 1 may monitor the response to the wake-up signal only within a specific time window after transmitting the wake-up signal.

[0054] The receiving unit of terminal device 1 receives random access responses. The receiving unit of terminal device 1 monitors random access responses within the random access response window. The receiving unit of terminal device 1 monitors contention resolution messages within the contention resolution timer.

[0055] The receiving unit of terminal device 1 receives SSB. The receiving unit of terminal device 1 selects the SSB with the best reception.

[0056] The transmitting unit (also called the transmitting processing unit) of terminal device 1 transmits a HARQ-ACK. The transmitting processing unit of terminal device 1 transmits a HARQ-ACK to the PDSCH. The transmitting processing unit of terminal device 1 transmits a HARQ-ACK in the uplink frequency band (cell, component carrier, carrier).

[0057] The transmitting unit of terminal device 1 transmits a random access preamble. The transmitting unit of terminal device 1 transmits a random access preamble using a preamble format. The transmission processing unit of terminal device 1 transmits a random access preamble using PRACH. The transmitting unit of terminal device 1 transmits RACH on RACH occasions. The transmitting unit of terminal device 1 transmits RACH on periodically set RACH occasions. The transmitting unit of terminal device 1 selects a RACH occasion from one or more RACH occasions corresponding to the SSB selected by the receiving unit of terminal device 1, and transmits RACH (random access preamble) on the selected RACH occasion.

[0058] The transmitter of terminal device 1 retransmits the random access preamble. The transmitter of terminal device 1 retransmits the random access preamble on multiple RACH occasions. The transmitter of terminal device 1 may retransmit the random access preamble up to a set maximum number (maximum number of random access preamble retransmissions). The transmitter of terminal device 1 may perform power ramping when retransmitting the random access preamble. The transmitter of terminal device 1 may set the transmission power of the random access preamble based on the initial random access preamble power. The transmitter of terminal device 1 may randomly select a random access preamble from multiple random access preambles set for contention-based random access.

[0059] The transmitter of terminal device 1 transmits a wake-up signal. The transmitter of terminal device 1 transmits a wake-up signal in the first cell. The transmitter of terminal device 1 may transmit a random access preamble as a wake-up signal. The transmitter of terminal device 1 may transmit a random access preamble using the preamble format set as the wake-up signal resource. The transmitter of terminal device 1 may transmit a random access preamble using PRACH set as the wake-up signal resource. The transmitter of terminal device 1 may transmit a wake-up signal on a RACH occasion set as the wake-up signal resource. The transmitter of terminal device 1 may, for one or more RACH occasions set as the wake-up signal resource, select a RACH occasion from one or more RACH occasions corresponding to the SSB selected by the receiver of terminal device 1, and transmit a wake-up signal on the selected RACH occasion.

[0060] The transmitting unit of terminal device 1 may retransmit the wake-up signal. The transmitting unit of terminal device 1 may retransmit the random access preamble set as the wake-up signal resource. The transmitting unit of terminal device 1 may retransmit the random access preamble set as the wake-up signal resource on multiple RACH occasions. The transmitting unit of terminal device 1 may retransmit the random access preamble set as the wake-up signal resource up to the set maximum number. The transmitting unit of terminal device 1 may perform power rampping when retransmitting the random access preamble using the power rampping value set as the wake-up signal resource.

[0061] The transmitting unit of terminal device 1 may select a wake-up signal that is capable of transmitting a wake-up signal and transmit the selected wake-up signal. Terminal device 1 may also select a cell from among one or more cells whose reception quality is above a certain threshold to transmit the wake-up signal.

[0062] The transmitting unit of terminal device 1 transmits signals to multiple base station devices 3. The transmitting unit of terminal device 1 transmits signals to multiple base station devices 3 at different frequencies.

[0063] The upper layer processing unit 14 outputs the uplink data (transport block) generated by user operations, etc., to the wireless transceiver unit 10. The upper layer processing unit 14 performs processing at the MAC layer, Packet Data Convergence Protocol (PDCP) layer, Radio Link Control (RLC) layer, and RRC layer.

[0064] The media access control layer processing unit (MAC layer processing unit) 15, which is part of the upper layer processing unit 14, performs MAC layer processing.

[0065] The wireless resource control layer processing unit 16, located in the upper layer processing unit 14, performs RRC layer processing. The wireless resource control layer processing unit 16 manages various setting information / parameters (RRC parameters) of its own device. The wireless resource control layer processing unit 16 sets various setting information / parameters (RRC parameters) based on the upper layer signals received from the base station device 3. That is, the wireless 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. Note that this setting information may include information related to the processing or setting of physical channels and physical signals (i.e., the physical layer), MAC layer, PDCP layer, RLC layer, and RRC layer. These parameters may also be upper layer parameters.

[0066] For example, the wireless resource control layer processing unit 16 may acquire RRC parameters contained in an RRC message on a certain logical channel and set the acquired RRC parameters in the memory area of ​​the terminal device 1. The RRC parameters set in the memory area of ​​the terminal device 1 may be provided to the lower layer.

[0067] The wireless resource control layer processing unit 16 sets the control resource set based on the RRC signaling received from the base station device 3. The wireless resource control layer processing unit 16 sets (configures) the search area within the control resource set. The wireless resource control layer processing unit 16 sets (configures) the PDCCH candidates to be monitored within the control resource set. The wireless resource control layer processing unit 16 sets (configures) the number of PDCCH candidates to be monitored within the control resource set. The wireless resource control layer processing unit 16 sets (configures) the aggregation level of the PDCCH candidates to be monitored within the control resource set. The wireless resource control layer processing unit 16 sets the DCI format to be monitored.

[0068] The wireless resource control layer processing unit 16 sets a RACH occasion based on the RRC parameters (RRC signaling) received from the base station device 3. The transmitter unit of the terminal device 1 transmits a RACH at the set RACH occasion. The transmitter unit of the terminal device 1 transmits a random access preamble with the RACH. The wireless resource control layer processing unit 16 may also set a maximum value for the number of retransmissions of the random access preamble based on the RRC parameters received from the base station device 3.

[0069] The wireless resource control layer processing unit 16 receives information indicating the configuration of the wake-up signal through RRC signaling (system information). The information indicating the configuration of the wake-up signal also includes information indicating the resources of the wake-up signal. The information indicating the configuration of the wake-up signal may also include information regarding monitoring the response to the wake-up signal. The information regarding monitoring the response to the wake-up signal may include information regarding the control resource set and information regarding the search area. The information indicating the configuration of the wake-up signal may also include information indicating the maximum number of times the wake-up signal has been transmitted. The information indicating the configuration of the wake-up signal may also include information indicating the value of the response window for the wake-up signal. The information indicating the configuration of the wake-up signal may also include information indicating the power ramping value for the wake-up signal. The information indicating the configuration of the wake-up signal may also include information indicating the initial power value for the wake-up signal.

[0070] The wireless resource control layer processing unit 16 sets various parameters of the wake-up signal (parameters related to time resources, parameters related to frequency resources, parameters related to code resources, parameters related to power resources, etc.) for the transmitting unit of the terminal device 1. When transmitting the wake-up signal, the transmitting unit of the terminal device 1 generates and transmits the wake-up signal using the parameters set by the wireless resource control layer processing unit 16.

[0071] The wireless resource control layer processing unit 16 sets the RACH preamble format (PRACH preamble format) to be used in the uplink slot based on the RRC signaling (system information) received from the base station device 3. Either the Short preamble format or the Long preamble format is set as the RACH preamble format (PRACH preamble format).

[0072] The Long preamble format is a RACH preamble format (PRACH preamble format) with a signal configuration of multiple slots. The Short preamble format is a RACH preamble format (PRACH preamble format) with a signal configuration of a single slot. For example, the Long preamble format is a RACH preamble format (PRACH preamble format) with a RACH preamble sequence length of 839 and a time length of 3 slots (3ms) or 4 slots (4ms). In NR, the Long preamble format is a RACH preamble format of Format 1 and Format 2. For example, the Short preamble format is a RACH preamble format with a RACH preamble sequence length of 839 and a time length of 1 slot (1ms). In NR, the Short preamble format is a Format 0 and Format 3.

[0073] The media access control layer processing unit (MAC layer processing unit) 15 performs MAC layer processing such as HARQ operations, MAC CE decoding, and processing based on the decoding results.

[0074] The wireless resource control layer processing unit 16 may include function information generated based on the functions of the terminal device 1 in the RRC message and transmit it to the base station device 3.

[0075] The wireless transceiver 10 performs modulation processing, encoding processing, and transmission processing. The wireless transceiver 10 generates a physical signal by encoding processing, modulation processing, and baseband signal generation processing (conversion to a time-continuous signal) of the data (transport block), and transmits it to the base station device 3 or the terminal device 1.

[0076] The wireless transceiver 10 performs demodulation, decoding, and reception processing. Based on the demodulation and decoding processing of the received physical signal, the wireless transceiver 10 outputs the transport block of the detected information to the upper layer processing unit 14 on the DL-SCH.

[0077] The RF unit 12 converts the signal received via the antenna unit 11 into a baseband signal (downconvert) and removes unwanted frequency components. The RF unit 12 outputs the baseband signal to the baseband unit 13.

[0078] The baseband unit 13 converts the analog signal input from the RF unit 12 into a digital signal. The baseband unit 13 removes the portion corresponding to the Cyclic Prefix (CP) 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 to extract the signal in the frequency domain.

[0079] The baseband unit 13 performs an inverse fast Fourier transform (IFFT) on the physical signal to generate an OFDM symbol. The baseband unit 13 adds a CP to the generated OFDM symbol to generate a baseband digital signal. The baseband unit 13 converts the baseband digital signal into an analog signal. The baseband unit 13 outputs the converted analog signal to the RF unit 12.

[0080] The RF unit 12 uses a low-pass filter to remove extraneous frequency components from the analog signal input from the baseband unit 13, upconverts the analog signal to the carrier frequency, and generates an RF signal. The RF unit 12 transmits the RF signal via the antenna unit 11. The RF unit 12 also amplifies power. The RF unit 12 may also have a function to control the transmission power. The RF unit 12 is also referred to as the transmission power control unit.

[0081] The following describes an example of the configuration of a base station device 3 according to one aspect of this embodiment.

[0082] Figure 4 is a schematic block diagram showing the configuration of a base station device 3 according to one aspect of this embodiment. As shown in the figure, the base station device 3 is composed of a wireless transceiver unit 30 and a higher layer processing unit 34. The wireless transceiver unit 30 is composed of an antenna unit 31, an RF (Radio Frequency) unit 32, and a baseband unit 33. The higher layer processing unit 34 is composed of a media access control layer processing unit 35 and a wireless resource control layer processing unit 36. The wireless transceiver unit 30 is also referred to as the transmitting unit, receiving unit, or physical layer processing unit.

[0083] The upper layer processing unit 34 performs processing for the MAC (Medium Access Control) layer, the Packet Data Convergence Protocol (PDCP) layer, the Radio Link Control (RLC) layer, and the Radio Resource Control (RRC) layer. Here, the MAC layer is also called the MAC sublayer. The PDCP layer is also called the PDCP sublayer. The RLC layer is also called the RLC sublayer. The RRC layer is also called the RRC sublayer.

[0084] The media access control layer processing unit 35, provided in the upper layer processing unit 34, performs MAC layer processing. Here, MAC layer processing may include some or all of the following: mapping between logical channels and transport channels, multiplexing of one or more MAC SDUs (Service Data Units) into transport blocks, decomposition of transport blocks delivered from the physical layer on the UL-SCH into one or more MAC SDUs, application of HARQ (Hybrid Automatic Repeat reQuest) to transport blocks, and processing of scheduling requests.

[0085] The wireless resource control layer processing unit 36, located in the upper layer processing unit 34, performs RRC layer processing. RRC layer processing may include some or all of the following: management of broadcast signals, management of RRC connection / RRC idle status, and RRC reconfiguration. The wireless resource control layer processing unit 36 ​​generates or obtains downlink data (transport blocks), system information, RRC messages, MAC CE, etc., which are placed on the PDSCH, from the upper node, and outputs them to the wireless transceiver unit 30.

[0086] Furthermore, the wireless resource control layer processing unit 36 ​​manages various setting information / parameters (RRC parameters) for each terminal device 1. The wireless resource control layer processing unit 36 ​​may set various setting information / parameters for each terminal device 1 via signals from higher layers. That is, the wireless resource control layer processing unit 36 ​​transmits / announces information indicating various setting information / parameters. This setting information may include information related to the processing or setting of physical channels and physical signals (i.e., the physical layer), MAC layer, PDCP layer, RLC layer, and RRC layer. These parameters may also be higher layer parameters. For example, the wireless resource control layer processing unit 36 ​​may transmit RRC parameters to a terminal device 1 in an RRC message on a certain logical channel. Here, the RRC message may be mapped to one of BCCH (Broadcast Control Channel), CCCH (Common Control Channel), or DCCH (Dedicated Control Channel).

[0087] The wireless resource control layer processing unit 36 ​​may determine the RRC parameters to be transmitted to the terminal device 1 based on the RRC parameters contained in the RRC message transmitted from the terminal device 1. Here, the RRC message transmitted from the terminal device 1 may be related to the functional information report of the terminal device 1.

[0088] The wireless 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 wireless resource control layer processing unit 36 ​​sets a search area for the terminal device 1. The wireless resource control layer processing unit 36 ​​sets the DCI format to be monitored in the search area for the terminal device 1.

[0089] The wireless resource control layer processing unit 36 ​​sets the DCI format to be applied to the terminal device 1 within the control resource set. The wireless resource control layer processing unit 36 ​​generates RRC signaling indicating the DCI format to be applied to the terminal device 1. The wireless resource control layer processing unit 36 ​​sets one or more DCI formats to be applied in the transmission processing unit.

[0090] The wireless resource control layer processing unit 36 ​​performs settings for multiple search areas. Each of the settings for the multiple search areas is indexed.

[0091] The wireless resource control layer processing unit 36 ​​sets resources for transmitting HARQ-ACK to the terminal device 1. The wireless resource control layer processing unit 36 ​​sets resources for transmitting HARQ-ACK to the PDSCH in the downlink frequency band (cell, component carrier, carrier). The wireless resource control layer processing unit 36 ​​sets resources for transmitting HARQ-ACK to the PDSCH in the uplink frequency band (cell, component carrier, carrier).

[0092] The wireless resource control layer processing unit 36 ​​sets the RACH occasion. The wireless resource control layer processing unit 36 ​​sets the period of the RACH occasion.

[0093] The wireless resource control layer processing unit 36 ​​may set a maximum value for the number of random access preamble retransmissions for a random access channel. The wireless resource control layer processing unit 36 ​​may set a value for the random access response window for a random access channel. The wireless resource control layer processing unit 36 ​​may set a value for the contention resolution timer for a random access channel. The wireless resource control layer processing unit 36 ​​may set a value for the power ramping for a random access channel. The wireless resource control layer processing unit 36 ​​may set a value for the initial random access preamble power for a random access channel. The wireless resource control layer processing unit 36 ​​may set a value for the total number of random access preambles for contention-based random access for a random access channel. The wireless resource control layer processing unit 36 ​​may set a number of random access channels that are frequency multiplexed in one time instance for a random access channel. The wireless resource control layer processing unit 36 ​​may set the RACH preamble format.

[0094] The wireless resource control layer processing unit 36 ​​sets the configuration of the wake-up signal. The wireless resource control layer processing unit 36 ​​sets the resources for the wake-up signal. The wireless resource control layer processing unit 36 ​​may set parameters related to monitoring the response to the wake-up signal. Parameters related to monitoring the response to the wake-up signal may include parameters related to the control resource set and parameters related to the search area. The wireless resource control layer processing unit 36 ​​may set the maximum number of times the wake-up signal is transmitted. The wireless resource control layer processing unit 36 ​​may set the response window value for the wake-up signal. The wireless resource control layer processing unit 36 ​​may set the power ramping value for the wake-up signal. The wireless resource control layer processing unit 36 ​​may set the initial power value for the wake-up signal. The wireless resource control layer processing unit 36 ​​may set the timer value for prohibiting the transmission of the wake-up signal. The wireless resource control layer processing unit 36 ​​transmits information indicating the configuration of the wake-up signal as system information from the transmission unit of the base station device 3.

[0095] The media access control layer processing unit (MAC layer processing unit) 35 performs MAC layer processing such as HARQ operations and MAC CE generation.

[0096] The functions of the wireless transceiver 30 are the same as those of the wireless transceiver 10, so their explanation will be omitted as appropriate. The wireless transceiver 30 performs physical layer processing. Here, the physical layer processing may include some or all of the generation of baseband signals for physical channels, generation of baseband signals for physical signals, and detection of information transmitted by physical channels and detection of information transmitted by physical signals. The physical layer processing may also include mapping of transport channels to physical channels. Here, the baseband signal is also referred to as a time-continuous signal.

[0097] The wireless transceiver 30 may perform demodulation processing and / or decoding processing. The wireless transceiver 30 may deliver the transport block from the information detected based on the demodulation and decoding processing of the received physical signal to the upper layer on the UL-SCH. For example, the wireless transceiver 30 may generate the baseband signal of the downlink physical channel. Here, the transport block delivered from the upper layer on the DL-SCH may be placed on the downlink physical channel. For example, the wireless transceiver 30 may generate the baseband signal of the downlink physical signal.

[0098] The wireless transceiver 30 may perform some or all of the modulation, coding, and transmission processes. The wireless transceiver 30 may generate a physical signal based on some or all of the coding, modulation, and baseband signal generation processes for the transport block. The wireless transceiver 30 may place the physical signal on a BWP. The wireless transceiver 30 may transmit the generated physical signal. For example, the wireless transceiver 30 may attempt to detect information transmitted by the uplink physical channel. Here, the transport block of the information transmitted by the uplink physical channel may be delivered to a higher layer on the UL-SCH. For example, the wireless transceiver 30 may attempt to detect information transmitted by the uplink physical signal.

[0099] The wireless transceiver 30 grasps the SS (Search space) configured in the terminal device 1. The wireless transceiver 30 grasps the search area within the control resource set configured in the terminal device 1. The wireless transceiver 30 grasps the PDCCH candidates monitored in the terminal device 1 and grasps the search area. The wireless transceiver 30 grasps which control channel element each PDCCH candidate monitored in the terminal device 1 is composed of (it grasps the control channel element number to which the PDCCH candidate is composed). The wireless transceiver 30 includes an SS grasping unit, which grasps the SS configured in the terminal device 1. The SS grasping unit grasps one or more PDCCH candidates within the control resource set configured as the Search space of the terminal device. The SS grasping unit grasps the PDCCH candidates configured in the search area of ​​the control resource set of the terminal device 1 (number of PDCCH candidates, PDCCH candidate numbers).

[0100] The SS understanding unit understands the configuration of the search area within the control resource set (number of PDCCH candidates, OFDM symbols of the PDCCH candidates, and aggregation level of the PDCCH candidates). The transmission unit (transmission processing unit) of the wireless transceiver 30 transmits a PDCCH to the terminal device 1 using the PDCCH candidates within the search area of ​​the control resource set.

[0101] The transmitting unit (also referred to as the transmitting processing unit) of the base station device 3 transmits a PDCCH. The transmitting processing unit of the base station device 3 transmits a PDCCH using a PDCCH candidate that is monitored by the terminal device 1. The transmitting processing unit of the base station device 3 transmits a PDCCH using a resource that corresponds to a PDCCH candidate within the search area set for the terminal device 1. The transmitting processing unit of the base station device 3 transmits a PDCCH using a PDCCH candidate from among the multiple search areas set for the terminal device 1, specifically the search area where the PDCCH is monitored by the terminal device 1.

[0102] The receiving unit (also referred to as the receiving processing unit) of base station device 3 receives HARQ-ACK. The receiving processing unit of base station device 3 receives HARQ-ACK for PDSCH. The receiving processing unit of base station device 3 receives HARQ-ACK in the uplink frequency band (cell, component carrier, carrier). The receiving processing unit of base station device 3 also receives HARQ-ACK for PDSCH in the downlink frequency band (cell, component carrier, carrier) managed by base station device 3.

[0103] The receiving unit of base station device 3 receives RACH. The receiving unit of base station device 3 performs random access preamble detection processing.

[0104] The wireless resource control layer processing unit 36 ​​sets a RACH occasion and transmits RRC parameters related to the set RACH occasion to the terminal device 1. The receiving unit of the base station device 3 receives RACH at the set RACH occasion. The receiving unit of the base station device 3 receives the random access preamble at RACH. The wireless resource control layer processing unit 36 ​​may set a maximum value for the number of retransmissions of the random access preamble and transmit RRC parameters related to the set maximum value for the number of retransmissions of the random access preamble to the terminal device 1. The wireless resource control layer processing unit 36 ​​may set a value for the random access response window and transmit RRC parameters related to the set random access response window value to the terminal device 1. The wireless resource control layer processing unit 36 ​​may set a value for the contention resolution timer and transmit RRC parameters related to the set contention resolution timer value to the terminal device 1. The wireless resource control layer processing unit 36 ​​may set a value for power ramping and transmit RRC parameters related to the set power ramping value to the terminal device 1. The wireless resource control layer processing unit 36 ​​may set the initial random access preamble power value and transmit RRC parameters related to the set initial random access preamble power value to the terminal device 1. The wireless resource control layer processing unit 36 ​​may set the total number of random access preambles for contention-based random access and transmit RRC parameters related to the set total number of random access preambles for contention-based random access to the terminal device 1. The wireless resource control layer processing unit 36 ​​may set the number of random access channels frequency-multiplexed in one time instance and transmit RRC parameters related to the set number of random access channels frequency-multiplexed in one time instance to the terminal device 1.

[0105] The receiving unit of base station device 3 receives the wake-up signal. The receiving unit of base station device 3 detects the wake-up signal. The receiving unit of base station device 3 performs wake-up signal detection processing. The receiving unit of base station device 3 does not continuously perform wake-up signal detection processing, but does so periodically at time intervals. By shortening the time that the receiving unit of base station device 3 performs the detection processing of the received signal, power consumption is reduced, and network energy saving is achieved.

[0106] The wireless resource control layer processing unit 36 ​​sets the wake-up signal resources and transmits RRC parameters related to the set wake-up signal resources (time resources, frequency resources, code resources, etc.) to the terminal device 1. The wireless resource control layer processing unit 36 ​​sets the parameters related to the wake-up signal and transmits RRC parameters related to the set wake-up signal parameters to the terminal device 1. The wireless resource control layer processing unit 36 ​​may set the preamble format of the random access preamble as the wake-up signal resource and transmit RRC parameters related to the set random access preamble preamble format to the terminal device 1. The wireless resource control layer processing unit 36 ​​may set the RACH occasion as the wake-up signal resource and transmit RRC parameters related to the set RACH occasion to the terminal device 1. The wireless resource control layer processing unit 36 ​​may set the maximum number of transmissions of the random access preamble as the wake-up signal resource and transmit RRC parameters related to the maximum number of transmissions of the set random access preamble to the terminal device 1. The wireless resource control layer processing unit 36 ​​may set a value for the wake-up signal transmission disable timer and transmit RRC parameters related to the set wake-up signal transmission disable timer value to the terminal device 1. The wireless resource control layer processing unit 36 ​​may also set a value for the wake-up signal power rampping and transmit RRC parameters related to the set wake-up signal power rampping value to the terminal device 1.

[0107] The transmitter unit of base station device 3 transmits PBCH. The transmitter unit of base station device 3 transmits MIB. The transmitter unit of base station device 3 transmits MIB using PBCH.

[0108] The transmitter unit of base station device 3 transmits PDCCH information (pdcch-ConfigSIB1) in the PBCH's MIB. The PDCCH information includes control resource set information (controlResourceSetZero). The control resource set information may include at least a portion of the following: information on the number of resource blocks constituting the control resource set, information on the number of symbols in the control resource set, information on the position (offset) of the resource blocks constituting the control resource block, and information on the multiplexing pattern of the SSB and the control resource set. The PDCCH information includes search space information (searchSpaceZero). The search space information may include at least a portion of the following: information on the slots that constitute the search space, and information on the symbols that constitute the search space. The PDCCH information is information on the PDCCH that schedules on-demand system information.

[0109] The transmitter of base station device 3 transmits information regarding the GSCN (Global Synchronization Channel Number) in the MIB of the PBCH. The information regarding the GSCN may also be information regarding the offset from a reference GSCN. The reference GSCN may be the GSCN on which the SSB is detected. The information regarding the GSCN is information regarding the GSCN of the cell on which the wake-up signal information is provided. The transmitter of base station device 3 transmits information regarding the GSCN (Global Synchronization Channel Number) using the PDCCH information (pdcch-ConfigSIB1) field of the MIB. Base station device 3 switches the information to be set in the PDCCH information (pdcch-ConfigSIB1) field of the MIB by indicating a specific value in predetermined information (ssb-SubcarrierOffset) included in the MIB. The predetermined information (ssb-SubcarrierOffset) also indicates the value of the frequency domain offset on a subcarrier basis between the SSB and the resource block grid. The predetermined information (ssb-SubcarrierOffset) may also indicate that SIB1 is provided. The predetermined information (ssb-SubcarrierOffset) indicates that SIB1 is provided by showing the value of the frequency domain offset per subcarrier between the SSB and the resource block grid. The predetermined information (ssb-SubcarrierOffset) may also indicate that SIB1 is not provided. The predetermined information (ssb-SubcarrierOffset) does not show the value of the frequency domain offset per subcarrier between the SSB and the resource block grid, indicating that SIB1 is not provided. The predetermined information (ssb-SubcarrierOffset) may also indicate that on-demand SIB1 is provided. The predetermined information (ssb-SubcarrierOffset) does not show the value of the frequency domain offset per subcarrier between the SSB and the resource block grid, indicating that on-demand SIB1 is provided.

[0110] If the base station device 3 indicates a value in predetermined information (ssb-SubcarrierOffset) that is different from a value indicating a frequency domain offset on a subcarrier basis between the SSB and the resource block grid (a value indicating that SIB1 is provided) or a value indicating that SIB1 is not provided, the base station device 3 uses the MIB's PDCCH information (pdcch-ConfigSIB1) to indicate information about the GSCN. In other words, the base station device 3 sets the predetermined information (ssb-SubcarrierOffset) to a value indicating that on-demand SIB1 is provided. If the base station device 3 indicates a value in predetermined information (ssb-SubcarrierOffset) that is different from a value indicating a frequency domain offset on a subcarrier basis between the SSB and the resource block grid or a value indicating that SIB1 is not provided, the base station device 3 uses the MIB's PDCCH information (pdcch-ConfigSIB1) to indicate information about the GSCN of the cell providing the wake-up signal information. If base station device 3 indicates a value indicating the frequency domain offset on a subcarrier basis between the SSB and the resource block grid using predetermined information (ssb-SubcarrierOffset), base station device 3 indicates information about the control resource set and information about the search area using MIB PDCCH information (pdcch-ConfigSIB1). If base station device 3 indicates a value indicating that SIB1 is not provided using predetermined information (ssb-SubcarrierOffset), base station device 3 indicates information about the GSCN of the cell providing SIB1 using MIB PDCCH information (pdcch-ConfigSIB1).

[0111] The transmitting unit of the base station device 3 transmits a response to the wake-up signal.

[0112] The RF unit 32 may convert the signal received via the antenna unit 31 into a baseband signal and remove unwanted frequency components. The RF unit 32 outputs the baseband signal to the baseband unit 33.

[0113] The baseband unit 33 may digitize the baseband signal input from the RF unit 32. The baseband unit 33 may remove the portion corresponding to the Cyclic Prefix (CP) from the digitized baseband signal. The baseband unit 33 may perform a Fast Fourier Transform (FFT) on the baseband signal from which the CP has been removed to extract the signal in the frequency domain.

[0114] The baseband unit 33 may generate a baseband signal by performing an inverse fast Fourier transform (IFFT) on the physical signal. The baseband unit 33 may add a CP to the generated baseband signal. The baseband unit 33 may convert the baseband signal with the CP added into an analog. The baseband unit 33 may output the analogized baseband signal to the RF unit 32.

[0115] The RF unit 32 may remove extraneous frequency components from the baseband signal input from the baseband unit 33. The RF unit 32 may upconvert the baseband signal to the carrier frequency to generate an RF signal. The RF unit 32 may transmit the RF signal via the antenna unit 31. The RF unit 32 may also be equipped with a function to control the transmission power.

[0116] Each of the parts designated by reference numerals 10 to 16 in the terminal device 1 may be configured as a circuit. Each of the parts designated by reference numerals 30 to 36 in the base station device 3 may be configured as a circuit.

[0117] The following describes the physical channels and physical signals (physical signals) according to various aspects of this embodiment. A physical signal is a general term for downlink physical channels, downlink physical signals, uplink physical channels, and uplink physical channels. A physical channel is a general term for downlink physical channels and uplink physical channels. A physical signal is a general term for downlink physical signals and uplink physical signals.

[0118] An uplink physical channel may correspond to a set of resource elements that carry information generated in the upper layer. An uplink physical channel is a physical channel used in the uplink component carrier. An uplink physical channel may be transmitted by the wireless transceiver 10. An uplink physical channel may be received by the wireless transceiver 30. In a wireless communication system according to one aspect of this embodiment, at least some or all of the following uplink physical channels are used: ・PUCCH (Physical Uplink Control Channel) ・PUSCH (Physical Uplink Shared Channel) ・PRACH (Physical Random Access Channel)

[0119] PUCCH may be used to transmit (transmit) Uplink Control Information (UCI). Uplink Control Information may be placed in PUCCH. Wireless transceiver 10 may transmit PUCCH containing Uplink Control Information. Wireless transceiver 30 may receive PUCCH containing Uplink Control Information.

[0120] Uplink control information (uplink control information bits, uplink control information sequence, uplink control information type) includes some or all of the channel state information (CSI), scheduling request (SR), and HARQ-ACK (Hybrid Automatic Repeatrequest ACKnowledgement) information. Uplink control information may also include information not listed above.

[0121] Channel status information is also referred to as channel status information bits or channel status information sequences. Scheduling requests are also referred to as scheduling request bits or scheduling request sequences. HARQ-ACK information is also referred to as HARQ-ACK information bits or HARQ-ACK information sequences.

[0122] HARQ-ACK information may consist of HARQ-ACK bits corresponding to a single transport block (TB). HARQ-ACK bits may indicate an ACK (acknowledgement) or a NACK (negative-acknowledgement) corresponding to the transport block. An ACK may indicate that the transport block has been decoded successfully. A NACK may indicate that the transport block has not been decoded successfully. HARQ-ACK information may contain one or more HARQ-ACK bits.

[0123] HARQ-ACK for transport blocks is also referred to as HARQ-ACK for PDSCH. Here, "HARQ-ACK for PDSCH" may refer to HARQ-ACK for transport blocks included in PDSCH.

[0124] A scheduling request may be used to request UL-SCH resources for initial transmission. The scheduling request bit may be used to indicate either a positive SR or a negative SR. When the scheduling request bit indicates a positive SR, it is also referred to as "a positive SR is transmitted." A positive SR may indicate that terminal device 1 is requesting UL-SCH resources for initial transmission. When the scheduling request bit indicates a negative SR, it is also referred to as "a negative SR is transmitted." A negative SR may indicate that terminal device 1 is not requesting UL-SCH resources for initial transmission.

[0125] Channel status information may include some or all of the Channel Quality Indicator (CQI), Precoder Matrix Indicator (PMI), and Rank Indicator (RI). CQI is an indicator related to the quality of the propagation path (e.g., propagation intensity) or the quality of the physical channel, PMI is an indicator related to the precoder, and RI is an indicator related to the transmit rank (or transmit layer number).

[0126] Channel status information is an indicator of the reception status of the physical signal (e.g., CSI-RS) used for channel measurement. The value of the channel status information may be determined by terminal device 1 based on the reception status assumed by the physical signal used for channel measurement. Channel measurement may include interference measurement.

[0127] PUCCH may be accompanied by a PUCCH format, where the PUCCH format may be the format of the physical layer processing of PUCCH, or it may be the format of the information transmitted using PUCCH.

[0128] A PUSCH may be transmitted to transmit uplink control information and / or a transport block. A PUSCH may be used to transmit uplink control information and / or a transport block. A PUSCH may be used to transmit at least some or all of a transport block, HARQ-ACK, channel status information, and scheduling request. A PUSCH may be used at least to transmit a random access message 3. A PUSCH may be used to transmit information not described above. Terminal device 1 may transmit a PUSCH containing uplink control information and / or a transport block. Base station device 3 may receive a PUSCH containing uplink control information and / or a transport block.

[0129] PRACH may be transmitted to convey the index of the random access preamble (random access message 1). Terminal device 1 may transmit PRACH. Base station device 3 may receive PRACH. Terminal device 1 may transmit the random access preamble over PRACH. Base station device 3 may receive the random access preamble over PRACH.

[0130] PRACH is used at least to send a random access preamble (random access message 1). PRACH may also be used at least to indicate some or all of the initial connection establishment procedure, handover procedure, connection re-establishment procedure, synchronization (timing adjustment) for sending PUSCH, and resource requests for PUSCH.

[0131] Uplink physical signals may correspond to a set of resource elements. Uplink physical signals do not necessarily have to be used to transmit information generated in the upper layer. However, uplink physical signals may be used to transmit information generated in the physical layer. Uplink physical signals may also be physical signals used in the uplink component carrier. Wireless transceiver 10 may transmit uplink physical signals. Wireless transceiver 30 may receive uplink physical signals. In the uplink of a wireless communication system according to one aspect of this embodiment, some or all of the following uplink physical signals may be used: ・UL DMRS (UpLink Demodulation Reference Signal) ・SRS (Sounding Reference Signal) ・UL PTRS (UpLink Phase Tracking Reference Signal) ・WakeUp Signal

[0132] UL DMRS is a general term for DMRS for PUSCH and DMRS for PUCCH.

[0133] The set of antenna ports for a DMRS for a PUSCH (DMRS associated with a PUSCH, DMRS included in a PUSCH, and DMRS corresponding to a PUSCH) may be given based on the set of antenna ports for the PUSCH. For example, the set of antenna ports for a DMRS for a PUSCH may be the same as the set of antenna ports for the PUSCH.

[0134] The propagation path of a pusher may be estimated from the DMRS for that pusher.

[0135] 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.

[0136] The propagation path of PUCCH may be estimated from the DMRS for the PUCCH.

[0137] The WakeUp Signal is used to trigger the transmission of on-demand system information. It may have a similar signal configuration to PRACH.

[0138] A downlink physical channel may correspond to a set of resource elements that transmit information generated in the upper layer. A downlink physical channel may also be a physical channel used in a downlink component carrier. The wireless transceiver 30 may transmit a downlink physical channel. The wireless transceiver 10 may receive a downlink physical channel. In the downlink of a wireless communication system according to one aspect of this embodiment, some or all of the following downlink physical channels may be used: ・PBCH (Physical Broadcast Channel) ・PDCCH (Physical Downlink Control Channel) ・PDSCH (Physical Downlink Shared Channel)

[0139] PBCHs are transmitted to transmit either or both Master Information Blocks (MIBs) and / or Physical Layer Control Information. Here, Physical Layer Control Information is information generated at the physical layer. MIBs are RRC messages delivered from higher layers over the Broadcast Control Channel (BCCH).

[0140] A PDCCH is used at least for transmitting Downlink Control Information (DCI). Downlink Control Information may be placed on the PDCCH. Terminal device 1 may receive a PDCCH containing Downlink Control Information. Base station device 3 may transmit a PDCCH containing Downlink Control Information.

[0141] Downlink control information may be transmitted in DCI format. The DCI format may be interpreted as the format of the downlink control information. Alternatively, the DCI format may be interpreted as a set of downlink control information set in a specific downlink control information format.

[0142] The base station device 3 may notify the terminal device 1 of downlink control information using a PDCCH with DCI format. Here, the terminal device 1 may monitor the PDCCH to obtain downlink control information. Unless otherwise specified, the DCI format and downlink control information may be described as equivalent. For example, the base station device 3 may transmit the downlink control information to the terminal device 1 in DCI format. Alternatively, the terminal device 1 may control the wireless transceiver 10 using the downlink control information contained in the detected DCI format.

[0143] Downlink control information may include at least one of either a downlink grant (DL grant) or an uplink grant (UL grant). The DCI format used for scheduling PDSCH is also called the downlink DCI format. The DCI format used for scheduling PUSCH is also called the uplink DCI format. Downlink grants are also called downlink assignments (DL assignments) or downlink allocations (DL allocations).

[0144] DCI formats 0_0, 0_1, 1_0, and 1_1 are all DCI formats. Uplink DCI formats are a general term for DCI formats 0_0 and 0_1. Downlink DCI formats are a general term for DCI formats 1_0 and 1_1.

[0145] DCI format 0_0 is used for scheduling PUSCH units placed in a cell. DCI format 0_1 ​​is used for scheduling PUSCH units placed in a cell. DCI format 1_0 is used for scheduling PDSCH units placed in a cell. DCI format 1_1 is used for scheduling PDSCH units placed in a cell.

[0146] DCI format 2_9 may be used to activate or deactivate the cell DTX / DRX settings of one or more serving cells for one or more UEs. DCI format 2_9 may be transmitted with a CRC scrambled by NES-RNTI. DCI format 2_9 consists of some or all of the following information: • Block number • Cell DTX / DRX indication

[0147] The DCI format may include an Identifier for DCI formats field indicating whether it is an uplink DCI format or a downlink DCI format. The DCI format may include a Frequency domain resource assignment field indicating the allocation of resources in the frequency domain. The DCI format may include a Time domain resource assignment field indicating the allocation of resources in the time domain. The DCI format may include a Frequency hopping flag field indicating whether frequency hopping is applied. The DCI format may include an MCS field (Modulation and Coding Scheme field) indicating one or both of the channel's modulation scheme and target coding rate. The DCI format may include a CSI request field indicating instructions for CSI reporting. The DCI format may include a BWP field indicating the BWP where the channel is located. The DCI format may include a PDSCH_HARQ feedback timing indicator field, which indicates when the HARQ-ACK is sent. The DCI format may also include a PUCCH resource indicator field, which indicates the PUCCH resource. Note that various DCI formats may include additional fields other than those described above.

[0148] A downlink grant is used for scheduling at least one PDSCH within a serving cell. A downlink grant is used for scheduling at least one PDSCH in the same slot from which the downlink grant was sent. A downlink grant may be used for scheduling a PDSCH in a different slot from the one from which the downlink grant was sent. An uplink grant is used for scheduling at least one PUSCH within a serving cell.

[0149] A PDSCH may be transmitted to transmit a transport block. A PDSCH may be used to transmit a transport block. A transport block may be placed on a PDSCH. Base station device 3 may transmit a PDSCH on which a transport block is placed. Terminal device 1 may receive a PDSCH on which a transport block is placed.

[0150] Downlink physical signals may correspond to a set of resource elements. Downlink physical signals do not necessarily have to be used to transmit information generated in the upper layers. However, downlink physical signals may be used to transmit information generated in the physical layer. Downlink physical signals may also be physical signals used in the downlink component carrier. Wireless transceiver 10 may receive downlink physical signals. Wireless transceiver 30 may transmit downlink physical signals. In the downlink of a wireless communication system according to one aspect of this embodiment, at least some or all of the following downlink physical signals may be used: ・Synchronization signal (SS) ・DL DMRS (Downlink DeModulation Reference Signal) ・CSI-RS (Channel State Information-Reference Signal) ・DL PTRS (Downlink Phase Tracking Reference Signal)

[0151] The synchronization signal is used by terminal device 1 to synchronize the downlink in the frequency domain and / or time domain. The synchronization signal is a general term for PSS (Primary Synchronization Signal) and SSS (Secondary Synchronization Signal).

[0152] An SS block (SS / PBCH block) consists of at least some or all of PSS, SSS, and PBCH.

[0153] The antenna ports for PSS, SSS, PBCH, and DMRS for PBCH may be the same.

[0154] The PBCH whose symbol is transmitted at a given antenna port may be estimated by a DMRS for the PBCH located in the slot to which the PBCH is mapped, and which is included in the SS / PBCH block containing the PBCH.

[0155] DL DMRS is a general term for DMRS for PBCH, DMRS for PDSCH, and DMRS for PDCCH.

[0156] The set of antenna ports for a DMRS for a PDSCH (DMRS associated with a PDSCH, DMRS included in a PDSCH, and DMRS corresponding to a PDSCH) may be given based on the set of antenna ports for the PDSCH. For example, the set of antenna ports for a DMRS for a PDSCH may be the same as the set of antenna ports for the PDSCH.

[0157] The propagation path of a PDSCH may be estimated from the DMRS for that PDSCH. If the set of resource elements on which a PDSCH symbol is transmitted and the set of resource elements on which the DMRS symbol for that PDSCH is transmitted belong to the same Precoding Resource Group (PRG), then the PDSCH on which the PDSCH symbol is transmitted at a given antenna port may be estimated from the DMRS for that PDSCH.

[0158] The antenna port for the DMRS for PDCCH (DMRS associated with PDCCH, DMRS included in PDCCH, DMRS corresponding to PDCCH) may be the same as the antenna port for PDCCH.

[0159] The propagation path of a PDCCH may be inferred from the DMRS for that PDCCH. If the same precoder is applied (or assumed to be applied) to the set of resource elements on which the symbol of a PDCCH is transmitted and to the set of resource elements on which the symbol of the DMRS for that PDCCH is transmitted, then the PDCCH on which the symbol of that PDCCH is transmitted at a given antenna port may be inferred from the DMRS for that PDCCH.

[0160] BCH (Broadcast Channel), UL-SCH (Uplink-Shared Channel), and DL-SCH (Downlink-Shared Channel) are transport channels.

[0161] The BCH in the transport layer may be mapped to the PBCH in the physical layer. That is, transport blocks delivered from higher layers on the BCH in the transport layer may be placed on the PBCH in the physical layer. Also, the UL-SCH in the transport layer may be mapped to the PUSCH in the physical layer.

[0162] The transport layer may apply HARQ (Hybrid Automatic Repeat reQuest) to the transport block.

[0163] BCCH (Broadcast Control Channel), CCCH (Common Control Channel), and DCCH (Dedicated Control Channel) are logical channels. For example, BCCH may be used to deliver RRC messages containing MIBs or RRC messages containing system information. CCCH may be used to transmit RRC messages containing common RRC parameters to multiple terminal devices 1. Here, CCCH may be used, for example, for terminal devices 1 that are not RRC connected. DCCH may be used to transmit RRC messages dedicated to a particular terminal device 1. Here, DCCH may be used, for example, for terminal devices 1 that are RRC connected.

[0164] BCCH may be mapped to BCH or DL-SCH. That is, RRC messages containing MIB information may be delivered to BCH. Also, RRC messages containing system information other than MIB may be delivered to DL-SCH. CCCH is mapped to DL-SCH or UL-SCH. That is, RRC messages mapped to CCCH may be delivered to DL-SCH or UL-SCH. Also, DCCH may be mapped to DL-SCH or UL-SCH. That is, RRC messages mapped to DCCH may be delivered to DL-SCH or UL-SCH.

[0165] UL-SCH may be mapped to PUSCH. DL-SCH may be mapped to PDSCH. BCH may be mapped to PBCH.

[0166] The media access control layer processing unit 15 may perform a random access procedure. The media access control layer processing unit 15 may select a RACH occasion in which it sends a random access preamble.

[0167] For example, downlink control information, including downlink grants or uplink grants, is transmitted and received via the PDCCH, including the C-RNTI (Cell-Radio Network Temporary Identifier).

[0168] A single physical channel may be mapped to a single serving cell. A single physical channel may be mapped to a single BWP configured on a single carrier contained within a single serving cell.

[0169] Terminal device 1 may have one or more control resource sets (CORESET) configured. Terminal device 1 monitors the PDCCH in one or more control resource sets. Here, monitoring the PDCCH in one or more control resource sets may include monitoring one or more PDCCHs corresponding to each of the one or more control resource sets. Note that a PDCCH may include one or more PDCCH candidates and / or a set of PDCCH candidates. Furthermore, monitoring the PDCCH may include monitoring and detecting the PDCCH and / or the DCI format transmitted via the PDCCH.

[0170] Multiple control resource sets may be configured in terminal device 1, and each control resource set may be assigned an index (control resource set index). One or more control channel elements (CCEs) may be configured within a control resource set, and each CCE may be assigned an index (CCE index).

[0171] The set of PDCCH candidates monitored by terminal device 1 is defined in terms of the search space. In other words, the set of PDCCH candidates monitored by terminal device 1 is given by the search space.

[0172] The search region may consist of one or more PDCCH candidates at one or more aggregation levels. The aggregation level of a PDCCH candidate may indicate the number of CCEs that constitute the PDCCH. A PDDCH candidate may be mapped to one or more CCEs.

[0173] A set of search regions may consist of at least one or more search regions. Each search region may be assigned an index (search region index).

[0174] Each of the search area sets may be associated with at least one control resource set. Each of the search area sets may be contained within one control resource set. Each of the search area sets may be given an index of the control resource set associated with that search area set.

[0175] The terminal device 1 can detect the PDCCH and / or DCI for itself by blindly detecting PDCCH candidates included in the search area within the control resource set.

[0176] In various embodiments of this embodiment, unless otherwise specified, the number of resource blocks indicates the number of resource blocks in the frequency domain.

[0177] Terminal device 1 transmits uplink control information (UCI) to base station device 3. Terminal device 1 may also transmit the UCI multiplexed with PUCCH. Terminal device 1 may also transmit the UCI multiplexed with PUSCH. The UCI may include at least one of the following: downlink channel state information (CSI), scheduling request (SR) indicating a request for PUSCH resources, or HARQ-ACK (Hybrid Automatic Repeat request ACKnowledgement) for downlink data (Transport block, Medium Access Control Protocol Data Unit: MAC PDU, Downlink-Shared Channel: DL-SCH, Physical Downlink Shared Channel: PDSCH).

[0178] HARQ-ACK may also be referred to as ACK / NACK, HARQ feedback, HARQ-ACK feedback, HARQ response, HARQ-ACK response, HARQ information, HARQ-ACK information, HARQ control information, and HARQ-ACK control information.

[0179] If the data is successfully decoded, an ACK is generated for the data. If the data is not successfully decoded, a NACK is generated for the data. A HARQ-ACK may include at least HARQ-ACK bits corresponding to at least one transport block. HARQ-ACK bits may indicate an ACK (ACKnowledgement) or a NACK (Negative-ACKnowledgement) corresponding to one or more transport blocks. A HARQ-ACK may include at least a HARQ-ACK codebook containing one or more HARQ-ACK bits. The correspondence of one or more transport blocks by HARQ-ACK bits may correspond to a PDSCH containing the one or more transport blocks.

[0180] HARQ control over a single transport block may be called a HARQ process. Each HARQ process may be assigned a unique HARQ process identifier. The DCI format includes a field indicating the HARQ process identifier (HARQ process number).

[0181] A New Data Indicator (NDI) is represented in DCI format for each HARQ process. For example, the DCI format (DL assignment) containing the scheduling information of a PDSCH includes an NDI field. The NDI field is 1 bit. Terminal device 1 stores (remembers) the NDI value for each HARQ process. Base station device 3 stores (remembers) the NDI value for each HARQ process for each terminal device 1. Terminal device 1 updates the stored NDI value using the detected NDI field in DCI format. Base station device 3 sets the updated NDI value, or the NDI value that has not been updated, in the NDI field in DCI format and transmits it to terminal device 1. Terminal device 1 updates the stored NDI value using the detected NDI field in DCI format for the HARQ process corresponding to the value of the detected HARQ process identifier field in DCI format.

[0182] Terminal device 1 determines whether a received transport block is a new transmission or a retransmission based on the value of the NDI field in the DCI format (DL assignment). Terminal device 1 compares the value of the NDI field in the DCI format that was previously received for a transport block of a certain HARQ process, and if the detected value of the NDI field in the DCI format has been toggled, it determines that the received transport block is a new transmission. When base station device 3 transmits a transport block for a new transmission in a certain HARQ process, it toggles the value of the NDI stored for that HARQ process and sends the toggled NDI to terminal device 1. When base station device 3 transmits a transport block for a retransmission in a certain HARQ process, it does not toggle the value of the NDI stored for that HARQ process and sends the untoggled NDI to terminal device 1. When terminal device 1 compares the value of the NDI field in the DCI format that was previously received for a transport block of a certain HARQ process, it determines that the received transport block is a retransmission if the detected value of the NDI field in the DCI format has not been toggled (if they are the same). Note that "toggle" here means switching to a different value.

[0183] Terminal device 1 may report HARQ-ACK information to base station device 3 using a HARQ-ACK codebook in a slot indicated by the value of the HARQ instruction field included in DCI format 1_0 or DCI format 1_1 that corresponds to PDSCH reception.

[0184] Terminal device 1 may report HARQ-ACK information for PDSCH reception in slot n using PUCCH transmission and / or PUSCH transmission in slot n+k. Here, k may be the number of slots indicated by the HARQ indicator field included in the DCI format corresponding to the PDSCH reception. If the HARQ indicator field is not included in the DCI format, k may be given by a higher-layer parameter.

[0185] Upper-layer parameters are parameters included in the upper-layer signal. The upper-layer signal may be RRC (Radio Resource Control) signaling or MAC CE (Medium Access Control Control Element). Here, the upper-layer signal may be the signal of the RRC layer or the signal of the MAC layer.

[0186] The upper layer signal may be common RRC signaling. The common RRC signaling may include at least some or all of the following features C1 to C3: Feature C1) A BCCH logical channel or a CCCH logical channel; Feature C2) A radioResourceConfigCommon information element, and Feature C3) A PBCH-mapped signal.

[0187] The radioResourceConfigCommon information element (RRC signaling) may include information indicating settings commonly used in a serving cell. This information includes information about the random access procedure. The settings commonly used in a serving cell may include at least the RACH setting. The RACH setting may indicate at least one or more random access preamble indices. The RACH setting may indicate at least the PRACH time / frequency resources.

[0188] Information indicating the RACH configuration includes information indicating the RACH occasion. The RACH occasion may be indicated in the form of a PRACH Configuration Index. A PRACH Configuration includes the RACH Preamble format, the Starting symbol indicating the starting position of the symbol in which the RACH is placed within the slot, the PRACH duration, and the RACH occasion. Multiple PRACH Configurations are pre-configured, and each PRACH Configuration is assigned an index called the PRACH Configuration Index. The RACH occasion is indicated by information indicating the Subframe number in which the RACH is placed. In addition, a PRACH Configuration may indicate the RACH occasion for a set of 10 Subframes, and this RACH occasion may be repeated every 10 Subframes. For example, the period of the RACH occasion may be indicated by the number of subframes, and may be 1, 2, 4, 8, or 16. For example, the period of the RACH occasion may be indicated by the number of slots, and may be 1, 2, 4, 8, 16, or 32. The period of RACHoccasion may be determined by indicating the location of the subframe in which RACH is placed and the location of the slot within that subframe.

[0189] The information indicating the RACH configuration may include information indicating the number of RACH occasions per SSB (ssb-perRACH-OccasionAndCB-PreamblesPerSSB). For example, each SSB may correspond to 8 RACH occasions, or 4 RACH occasions, or 2 RACH occasions, or 1 RACH occasion. For example, each of 2 SSBs may correspond to 1 RACH occasion. For example, each of 4 SSBs may correspond to 1 RACH occasion. For example, each of 8 SSBs may correspond to 1 RACH occasion. For example, each of 16 SSBs may correspond to 1 RACH occasion. The information indicating the RACH configuration (ssb-perRACH-OccasionAndCB-PreamblesPerSSB) may also include information indicating the number of random access preambles (Contention Based preambles) per SSB. For example, each SSB may be associated with 4, 8, 12, 16, 24, 28, 32, 36, 40, 44, 48, 52, 56, 60, or 64 random access preambles (Contention Based preambles).

[0190] The information indicating the RACH configuration may include information indicating the maximum number of retries for the random access preamble. More specifically, this is the maximum number of random access preamble transmissions before declaring a failure of the random access procedure. For example, it may be 3, 4, 5, 6, 7, 8, 10, 20, 50, 100, or 200 retries.

[0191] Information indicating the RACH configuration may include information indicating the RACH occasion, i.e., information indicating the periodicity of the RACH occasion. Information indicating the RACH configuration may also include information indicating the maximum number of retransmissions of the random access preamble.

[0192] The information describing the RACH configuration may include information indicating the number of random access preambles used for contention-based random access and contention-free random access. For example, the number of random access preambles used for contention-based random access and contention-free random access may be indicated as 1 to 63. Each piece of information describing the RACH configuration may independently include information indicating the number of random access preambles used for contention-based random access. For example, the number of random access preambles used for contention-based random access may be indicated as 1 to 63.

[0193] The information indicating the RACH configuration may include information indicating the length of the random access response window used to detect random access responses. For example, the length of the random access response window may be indicated by the number of slots, and may be one, two, four, eight, ten, twenty, forty, or eighty slots.

[0194] Information indicating the RACH configuration may include information indicating the power ramping step for PRACH. For example, the power ramping step may be 0 dB, 2 dB, 4 dB, or 6 dB.

[0195] Information indicating the RACH configuration may include information indicating the number of PRACH transmission segments that are frequency multiplexed in a single time instance. For example, the number of PRACH transmission segments that are frequency multiplexed in a single time instance may be one, two, four, or eight.

[0196] Information indicating the RACH configuration may include information indicating the value of the contention resolution timer. For example, the contention resolution timer value may be indicated by the number of subframes, and may be one of the following numbers: 8, 16, 24, 32, 40, 48, 56, or 64.

[0197] The information indicating the RACH configuration may include information indicating the initial random access preamble power (target power level on the network receiver side). For example, the initial random access preamble power may be any value between -202 dB and -60 dB in 2 dB increments.

[0198] Information indicating the wake-up signal setting is included in the higher-level signals. Information indicating the wake-up signal setting is included in the system information. Information indicating the wake-up signal setting is included in the system information block.

[0199] Information indicating the setting (configuration) of a wake-up signal includes information indicating the Occasion (WakeUp occasion) in which the wake-up signal resources are configured. The WakeUp occasion may include information indicating the starting position of the symbol in which the wake-up signal is placed within the slot, information indicating the subframe number in which the wake-up signal is placed, information indicating the period of the subframe in which the wake-up signal is placed, or information indicating the period of the slot in which the wake-up signal is placed. For example, the period of the WakeUp occasion may be indicated by the number of subframes, which may be 1, 2, 4, 8, or 16. For example, the period of the WakeUp occasion may be indicated by the number of slots, which may be 1, 2, 4, 8, 16, or 32. The period of the WakeUp occasion may also be recognized by indicating the position of the subframe in which the wake-up signal is placed and the position of the slot within the subframe.

[0200] Information indicating the wake-up signal settings (configuration) may include information indicating the number of wake-up occasions per SSB. For example, each SSB may correspond to 8 wake-up occasions, or 4 wake-up occasions, or 2 wake-up occasions, or 1 wake-up occasion. For example, each of 2 SSBs may correspond to 1 wake-up occasion. For example, each of 4 SSBs may correspond to 1 wake-up occasion. For example, each of 8 SSBs may correspond to 1 wake-up occasion. For example, each of 16 SSBs may correspond to 1 wake-up occasion.

[0201] Information indicating the wake-up signal settings (configuration) may include information indicating the maximum number of times the wake-up signal will be transmitted (retransmitted). For example, it may be 3, 4, 5, 6, 7, 8, 10, 20, 50, 100, or 200 times.

[0202] Information indicating the wake-up signal settings (configuration) may include information indicating the length of the response window used to detect the wake-up signal response. For example, the length of the response window may be indicated by the number of slots, and may be one, two, four, eight, ten, twenty, forty, or eighty slots. The response window may also be a monitoring window for on-demand system information.

[0203] Information indicating the wake-up signal settings (configuration) may include information indicating the power ramping step for the wake-up signal. For example, the power ramping step may be 0 dB, 2 dB, 4 dB, or 6 dB.

[0204] Information indicating the wake-up signal settings (configuration) may include information indicating the initial wake-up signal power (target power level on the network receiver side). For example, the initial wake-up signal power may be any value between -202 dB and -60 dB in 2 dB increments.

[0205] The upper layer signal may be dedicated RRC signaling. The dedicated RRC signaling may include at least some or all of the following features D1 to D2: Feature D1) Includes at least a radioResourceConfigDedicated information element mapped to a DCCH logical channel. Feature D2) Includes at least a radioResourceConfigDedicated information element.

[0206] The radioResourceConfigDedicated information element may include at least information indicating settings specific to terminal device 1. The radioResourceConfigDedicated information element may include at least information indicating BWP settings. The BWP settings may at least indicate the frequency resources of the BWP.

[0207] For example, MIB, first system information, and second system information may be included in the common RRC signaling. Also, upper-layer messages that are mapped to a DCCH logical channel and include at least radioResourceConfigCommon may be included in the common RRC signaling. Also, upper-layer messages that are mapped to a DCCH logical channel and do not include the radioResourceConfigCommon information element may be included in the dedicated RRC signaling. Also, upper-layer messages that are mapped to a DCCH logical channel and include at least the radioResourceConfigDedicated information element may be included in the dedicated RRC signaling.

[0208] The first system information may include at least information related to RACH resources. The first system information may include information indicating the configuration of Random access (RACH settings). The first system information may include at least information related to the initial connection settings. The second system information may be system information other than the first system information.

[0209] The radioResourceConfigDedicated information element may include at least information related to the RACH resource. The radioResourceConfigDedicated information element may also include at least information related to the initial connection configuration.

[0210] Information related to the reception of a PDCCH may include information related to an ID indicating the destination of the PDCCH. The ID indicating the destination of the PDCCH may be an ID used for scrambling the CRC bits attached to the PDCCH. The ID indicating the destination of the PDCCH is also called an RNTI (Radio Network Temporary Identifier). Information related to the reception of a PDCCH may include information related to an ID used for scrambling the CRC bits attached to the PDCCH. Terminal device 1 can attempt to receive the PDCCH based at least on the information related to the ID contained in the PBCH.

[0211] RNTI may include C-RNTI (Common-RNTI), Temporary C-RNTI (TC-RNTI), and RA-RNTI (Random Access-RNTI). C-RNTI is used at least to schedule user data for RRC-connected terminal device 1. Temporary C-RNTI is used at least to schedule random access messages 4. Temporary C-RNTI is used at least to schedule PDSCH containing data mapped to CCCH in a logical channel. RA-RNTI is used at least to schedule random access messages 2.

[0212] PDSCH may be used at least to send / receive transport blocks. PDSCH may be used at least to send / receive random access messages 2 (random access responses). PDSCH may be used at least to send / receive system information, including parameters used for initial access. PDSCH may be used at least to send / receive random access messages 4.

[0213] The PBCH is used to transmit / receive information about the PDCCH (pdcch-ConfigSIB1). The information about the PDCCH includes information about the control resource set (controlResourceSetZero). The information about the control resource set may include at least a portion of the following: information about the number of resource blocks that make up the control resource set, information about the number of symbols in the control resource set, information about the position (offset) of the resource blocks that make up the control resource block, and information about the multiplexing pattern of the SSB and the control resource set. The information about the PDCCH includes information about the search space (searchSpaceZero). The information about the search space may include at least a portion of the following: information about the slots that make up the search space, and information about the symbols that make up the search space. The information about the PDCCH is information about the PDCCH that schedules on-demand system information.

[0214] The PBCH is used to transmit / receive information regarding the GSCN (Global Synchronization Channel Number). The GSCN information may also be information regarding the offset from a reference GSCN. The reference GSCN may be the GSCN from which the SSB was detected. The GSCN information is information regarding the GSCN of the cell from which the wake-up signal information is provided. The GSCN information is information regarding the GSCN of the cell from which SIB1 is provided. The PDCCH information (pdcch-ConfigSIB1) is reused to transmit and receive information regarding the GSCN (Global Synchronization Channel Number). The information indicated by the PDCCH information (pdcch-ConfigSIB1) is identified by the value of predetermined information (ssb-SubcarrierOffset) included in the MIB. The predetermined information (ssb-SubcarrierOffset) indicates the value of the frequency domain offset on a subcarrier basis between the SSB and the resource block grid.

[0215] Terminal device 1 attempts to establish a connection with base station device 3. Figure 5 shows an example of an initial connection procedure (4-step contention-based RACH procedure) according to one aspect of this embodiment. The initial connection procedure consists of at least some of steps 5101 to 5104. Here, the contention-based random access procedure will be described. Note that the contention-based random access procedure can also be used for purposes other than initial connection.

[0216] Prior to performing step 5101, terminal device 1 performs time-frequency synchronization of the downlink. A synchronization signal (SSB) is used for terminal device 1 to perform time-frequency synchronization of the downlink. Terminal device 1 uses the synchronization signal transmitted from base station device 3.

[0217] The synchronization signal may include the ID of the target cell (cell ID) when transmitted. The synchronization signal may include a sequence generated at least based on the cell ID when transmitted. The inclusion of the cell ID in the synchronization signal may mean that a sequence of synchronization signals is given based on the cell ID. The synchronization signal may be beam-applied and transmitted.

[0218] The beam exhibits the phenomenon where the antenna gain differs depending on the direction. The beam may be provided based at least on the directivity of the antenna. Alternatively, the beam may be provided based at least on the phase transformation of the carrier signal. Furthermore, the beam may be provided by applying a precoder.

[0219] Step 5101 is the step in which the terminal device 1 transmits a RACH to the base station device 3. SSBs and RACH occasions are associated with each other. Multiple RACH occasions are associated with each SSB. The terminal device 1 recognizes the RACH occasion associated with each SSB from the information indicating the RACH settings. The terminal device 1 selects a RACH occasion from one or more RACH occasions corresponding to the detected SSB to which to transmit the RACH. The terminal device 1 transmits the RACH on the selected RACH occasion.

[0220] Terminal device 1 selects a RACH occasion indicated by information indicating the configuration of the random access channel. Terminal device 1 randomly selects one random access preamble from among multiple random access preambles indicated by information indicating the configuration of the random access channel. Terminal device 1 may set the transmit power of the random access preamble based on the initial random access preamble power indicated by information indicating the configuration of the random access channel.

[0221] Step 5102 is the step in which the base station device 3 responds to the terminal device 1 for the random access message 1. This response is also referred to as the random access message 2. The random access message 2 may be transmitted via a PDSCH. The PDSCH containing the random access message 2 is scheduled by a PDCCH. The CRC bits included in the PDCCH may be scrambled by RA-RNTI. The random access message 2 may be transmitted including a special uplink grant. This special uplink grant is also referred to as a random access response grant. This special uplink grant may be included in the PDSCH containing the random access message 2. The random access response grant may include at least a Temporary C-RNTI.

[0222] Terminal device 1 determines whether it receives random access message 2 (random access response) within the random access response window. If terminal device 1 determines that it did not receive random access message 2 within the random access response window, it determines that random access message 1 (random access preamble) was not detected by base station device 3 and resumes processing from step 5101.

[0223] Terminal device 1 may set a random access response window of a value (length) indicated by the information showing the configuration of the random access channel.

[0224] Step 5103 is the step in which terminal device 1 sends an RRC connection request to the target cell. The RRC connection request is also referred to as a random access message 3. The random access message 3 may be sent via a PUSCH scheduled by a random access response grant. The random access message 3 may include an ID used to identify terminal device 1. The ID may be an ID managed at a higher layer. The ID may be an S-TMSI (SAE Temporary Mobile Subscriber Identity). The ID may be mapped to a CCCH in the logical channel.

[0225] Step 5104 is the step in which the base station device 3 sends a contention resolution message to the terminal device 1. The contention resolution message is also called a random access message 4. After sending the random access message 3, the terminal device 1 monitors the PDCCH to schedule a PDSCH containing the random access message 4. The random access message 4 may include a contention resolution ID. Here, the contention resolution ID is used to resolve collisions in which multiple terminal devices 1 transmit signals using the same radio resources. The contention resolution ID is also called a UE contention resolution identity.

[0226] In step 5104, terminal device 1, having sent a random access message 3 containing an ID used to identify terminal device 1 (e.g., S-TMSI), monitors a random access message 4 containing a collision resolution message. If the collision avoidance ID contained in the random access message 4 is equal to the ID used to identify terminal device 1, terminal device 1 considers that collision resolution has been successfully completed and may set the value of Temporary C-RNTI in the C-RNTI field. Terminal device 1 with the value of Temporary C-RNTI set in the C-RNTI field is considered to have completed the RRC connection.

[0227] Terminal device 1 determines whether it has received a random access message 4 (collision resolution message) within the contention resolution timer. Note that the contention resolution timer starts measuring due to the transmission of random access message 3. If terminal device 1 determines that it has not received random access message 4 within the contention resolution timer, it determines that random access message 3 was not received by base station device 3 and resumes processing from step 5101.

[0228] Terminal device 1 may set a contention resolution timer of a value (length) indicated by information showing the configuration of the random access channel.

[0229] In a series of random access procedures, the number of times step 5101 is performed corresponds to the number of times the random access preamble is retransmitted. When the random access preamble is retransmitted, power ramping may be applied to the transmission power setting of the random access preamble. In other words, the transmission power may be set higher by the power ramping value. Terminal device 1 may set the value indicated in the information indicating the configuration of the random access channel to the upper limit of the number of times the random access preamble is retransmitted. Terminal device 1 may set the value indicated in the information indicating the configuration of the random access channel to the power ramping value.

[0230] Before initiating the initial connection procedure using the random access procedure in the NES Cell, terminal device 1 transmits a wake-up signal, receives a response to the wake-up signal, receives a PBCH to obtain information about the PDCCH, receives an SIB1 based on the obtained information about the PDCCH, and obtains information (parameters) about the random access procedure from the received SIB1. In other words, terminal device 1 performs a PBCH receiving operation in order to receive an SIB1 containing information about the random access procedure, triggered by receiving a response to the wake-up signal. For example, if terminal device 1 receives a PBCH in the NES Cell that indicates that an SIB1 is provided on demand and that the GSCN of the cell providing information about the wake-up signal configuration is obtained from the cell at the frequency indicated by the GSCN, terminal device 1 transmits a wake-up signal in the NES Cell, receives a response to the wake-up signal, and then re-obtains the MIB of the PBCH in the NES Cell. The reacquired MIB shows information about the PDCCH, and terminal device 1 receives the SIB1 based on the PDCCH information, obtains information about the random access procedure, and starts the initial connection procedure using the random access procedure. For example, if terminal device 1 detects a cell that provides information about the wake-up signal configuration before detecting an NES cell, terminal device 1 transmits a wake-up signal with the NES cell, receives a response to the wake-up signal, and then acquires the MIB of the PBCH with the NES cell. Terminal device 1 detects the SSB with the NES cell to synchronize, but the MIB of the PBCH received at this time does not show information about the PDCCH, but rather information about the GSCN of the cell that provides information about the wake-up signal configuration. Therefore, after receiving a response to the wake-up signal, terminal device 1 receives the PBCH to obtain information about the PDCCH and acquires the MIB.

[0231] Based on the detection of the wake-up signal, base station device 3 recognizes that terminal device 1 needs to receive information about the PDCCH in order to receive SIB1. Therefore, after sending a response to the wake-up signal, base station device 3 modifies the MIB information of the PBCH and sends the MIB. Specifically, base station device 3 changes ssb-SubcarrierOffset, which was set to a value indicating that on-demand SIB1 is provided, to a value indicating that SIB1 is provided and sends it. Specifically, base station device 3 changes pdcch-ConfigSIB1, which was set to information about the GSCN of the cell that provides information about the configuration of the wake-up signal, to information about the control resource set of the PDCCH that schedules SIB1 and information about the search area, and sends it. After sending the MIB of the PBCH with the information settings changed, base station device 1 reverts to the original information settings and sends the MIB of the PBCH. After sending a response to the wake-up signal, base station device 1 sends the MIB of the PBCH with the information settings changed for a certain period of time. Alternatively, base station device 1 transmits a specific number of MIBs for the PBCH with modified information settings after sending a response to the wake-up signal. Base station device 3, having transmitted the MIB with modified information settings, transmits SIB1. Terminal device 1, having received the MIB with modified information settings, receives SIB1. In this way, pdcch-ConfigSIB1 can be configured to show information about the PDCCH only when necessary, and otherwise show the GSCN of the cell that provides information about the wake-up signal configuration.

[0232] Here, ssb-SubcarrierOffset may remain unchanged, and only pdcch-ConfigSIB1 may be changed. After transmitting a response to the wake-up signal, base station device 3 may transmit ssb-SubcarrierOffset, which contains information indicating that on-demand SIB1 will be provided, and pdcch-ConfigSIB1, which contains information about the PDCCH. After receiving a response to the wake-up signal, terminal device 1 may interpret the received MIB as follows: ssb-SubcarrierOffset indicates that on-demand SIB1 will be provided, while pdcch-ConfigSIB1 contains information about the PDCCH, not information about the GSCN of the cell providing the wake-up signal configuration. After a certain period of time, or after a certain number of times, pdcch-ConfigSIB1 is interpreted as containing information about the GSCN of the cell providing the wake-up signal configuration.

[0233] Figure 6 shows an example of the process of acquiring an MIB after receiving a response to a wake-up signal according to one aspect of this embodiment. Terminal device 1, which transmitted the wake-up signal, receives a response to the wake-up signal (step S201). Upon receiving the response to the wake-up signal, terminal device 1 receives the PBCH, acquires the MIB, and acquires information about the PDCCH (step S202). The information about the PDCCH includes the control resource set of the PDCCH that schedules the PDSCH including the SIB1, and information about the search area. Based on the information about the PDCCH, terminal device 1 acquires the SIB1 and acquires information about the random access procedure (step S203). The information about the random access procedure includes the uplink frequency, RACH information, etc. Based on the acquired information about the random access procedure, terminal device 1 starts the random access procedure for initial connection (step S204).

[0234] As described above, in a cell that supports on-demand system information transmission, by transmitting a wake-up signal, receiving a response to the wake-up signal, obtaining a Master Information Block (MIB) after receiving the response, obtaining information about the Physical Downlink Control Channel (PDCCH) from the MIB, obtaining a System Information Block 1 (SIB1) based on the information about the PDCCH, and performing a random access procedure based on the information contained in the SIB1, it is possible to avoid the centralized provision of information about the PDCCH in a cell that provides information about the wake-up signal configuration. If information about the PDCCH is provided to multiple NES cells in a cell that provides information about the wake-up signal configuration, the overhead burden will be concentrated in that cell. Information about the PDCCH can be provided for each cell where wake-up signals are transmitted and received, and as a result, on-demand system information can be transmitted and received efficiently.

[0235] The programs that run on the base station device 3 and terminal device 1 in this embodiment may be programs that control the CPU (Central Processing Unit) and the like (programs that make the computer function) in order to realize the functions of the above embodiment in this embodiment. The information handled by these devices is temporarily stored in RAM (Random Access Memory) during processing, and then stored in various ROMs such as Flash ROM (Read Only Memory) or HDD (Hard Disk Drive), and read, modified, and written by the CPU as needed.

[0236] Furthermore, the terminal device 1 and a part of the base station device 3 in the above-described embodiment may be implemented using a computer. In that case, the program for implementing this control function may be recorded on a computer-readable recording medium, and the program recorded on this recording medium may be read by a computer system and executed.

[0237] Furthermore, the term "computer system" as used herein refers to a computer system built into terminal device 1 or base station device 3, and includes hardware such as the OS and peripheral devices. In addition, "computer-readable recording medium" refers to portable media such as flexible disks, magneto-optical disks, ROMs, CD-ROMs, and storage devices such as hard disks built into computer systems.

[0238] Furthermore, "computer-readable recording media" may include those that dynamically hold programs for a short period of time, such as communication lines used when transmitting programs via networks such as the Internet or communication lines such as telephone lines, as well as those that hold programs for a certain period of time, such as volatile memory within a computer system that acts as a server or client in such cases. In addition, the above-mentioned program may be for the purpose of realizing some of the functions described above, and may also be a program that can realize the above-mentioned functions in combination with a program already recorded in the computer system.

[0239] Terminal device 1 may consist of at least one processor and at least one memory containing computer program instructions (computer program). The memory and computer program instructions (computer program) may be configured to cause terminal device 1 to perform the operations and processing described in the above embodiment using the processor. Base station device 3 may consist of at least one processor and at least one memory containing computer program instructions (computer program). The memory and computer program instructions (computer program) may be configured to cause base station device 3 to perform the operations and processing described in the above embodiment using the processor.

[0240] Furthermore, the base station device 3 in the above-described embodiment can also be realized as an assembly (device group) composed of multiple devices. Each device constituting the device group may have some or all of the functions or functional blocks of the base station device 3 related to the above-described embodiment. The device group only needs to have a complete set of the functions or functional blocks of the base station device 3. In addition, the terminal device 1 related to the above-described embodiment can also communicate with the base station device as an assembly.

[0241] Furthermore, the base station device 3 in the above-described embodiment may be EUTRAN (Evolved Universal Terrestrial Radio Access Network) and / or NG-RAN (NextGen RAN, NR RAN). Also, the base station device 3 in the above-described embodiment may have some or all of the functions of a higher-level node for eNodeB and / or gNB.

[0242] Furthermore, some or all of the terminal device 1 and base station device 3 in the above-described embodiment may be implemented as LSIs, which are typically integrated circuits, or as chipsets. Each functional block of the terminal device 1 and base station device 3 may be individually chipped, or some or all of them may be integrated into a single chip. In addition, the method of implementing the integrated circuit is not limited to LSIs; it may also be implemented using dedicated circuits or general-purpose processors. Moreover, if advances in semiconductor technology lead to the emergence of integrated circuit technologies that can replace LSIs, it is also possible to use integrated circuits based on those technologies.

[0243] Furthermore, although the above-described embodiment mentions a terminal device as an example of a communication device, the present invention is not limited to this and can also be applied to stationary or non-movable electronic devices installed indoors or outdoors, such as AV equipment, kitchen equipment, cleaning and washing machines, air conditioning equipment, office equipment, vending machines, and other household appliances, as well as terminal devices or communication devices.

[0244] While embodiments of this invention have been described in detail above with reference to the drawings, the specific configuration is not limited to these embodiments, and design modifications and the like that do not depart from the gist of this invention are also included. Furthermore, various modifications are possible within the scope of the claims for one aspect of the present invention, and embodiments obtained by appropriately combining the technical means disclosed in different embodiments are also included in the technical scope of the present invention. In addition, configurations in which elements described in each of the above embodiments that produce similar effects are substituted for each other are also included.

[0245] One aspect of the present invention can be used, for example, in communication systems, communication equipment (e.g., mobile phone devices, base station devices, wireless LAN devices, or sensor devices), integrated circuits (e.g., communication chips), or programs.

[0246] 1 (1A, 1B, 1C) Terminal device 3 Base station device 10, 30 Wireless transceiver unit 11, 31 Antenna unit 12, 32 RF unit 13, 33 Baseband unit 14, 34 Upper layer processing unit 15, 35 Media access control layer processing unit 16, 36 Wireless resource control layer processing unit

Claims

1. A terminal device comprising a processor and a memory for storing computer program code, wherein the terminal device performs the following actions: transmitting a wake-up signal, receiving a response to the wake-up signal, obtaining an MIB after receiving the response, obtaining information about a PDCCH from the MIB, obtaining an SIB1 based on the information about the PDCCH, and performing a random access procedure based on the information contained in the SIB1.

2. The terminal device according to claim 1, wherein the information relating to the PDCCH includes at least information relating to a control resource set and information relating to a search area.

3. The terminal device according to claim 1, wherein, after receiving the response, the information element pdcch-ConfigSIB1 is interpreted as indicating information about the PDCCH.

4. A communication method used in a terminal device, comprising the steps of: transmitting a wake-up signal; receiving a response to the wake-up signal; obtaining an MIB after receiving the response; obtaining information about a PDCCH from the MIB; obtaining an SIB1 based on the information about the PDCCH; and performing a random access procedure based on the information contained in the SIB1.

Images