Terminal device and communication method

Abstract

The present invention transmits a wake-up signal, and retransmits the wake-up signal by applying power ramping when no responses to the wake-up signal are detected, or causes a first timer to start timekeeping when a response to the wake-up signal is detected, and retransmits the wake-up signal by applying the latest amount of power ramping when the first timer has expired.

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. 2024-100344, filed in Japan on June 21, 2024, the contents of which are incorporated herein by reference.

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

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

[0004] 3GPP is studying methods to reduce energy consumption in networks in order to reduce the burden on the environment and reduce operation costs (Non-Patent Document 1). The majority of network energy consumption is consumed in the radio access network. They are studying ways to reduce network energy consumption by shortening the time that base station devices transmit or receive signals and lengthening the time that base station devices can enter 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] Supporting on-demand transmission and reception of system information is under consideration. Using a wake-up signal to trigger transmission and reception of system information is under consideration. Reducing the time during which a base station device transmits system information to reduce energy consumption in a network is under consideration. In this situation, 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 object, one aspect of the present invention takes the following measures: That is, a first aspect of the present invention is a terminal device including a processor and a memory that stores computer program code, which transmits a wake-up signal, and if a response to the wake-up signal is not detected, retransmits the wake-up signal by applying power ramping, starts a first timer when a response to the wake-up signal is detected, and if the first timer expires, retransmits the wake-up signal by applying the latest amount of power ramping.

[0008] (2) Further, the retransmission of the wake-up signal is stopped until the first timer expires.

[0009] (3) Furthermore, when on-demand system information is received, the first timer is reset.

[0010] (4) A second aspect of the present invention is a communication method for use in a terminal device, comprising the steps of: transmitting a wake-up signal; if no response to the wake-up signal is detected, retransmitting the wake-up signal by applying power ramping; if a response to the wake-up signal is detected, starting a first timer; and if the first timer expires, retransmitting the wake-up signal by applying the latest amount of power ramping.

[0011] (5) Further, the retransmission of the wake-up signal is stopped until the first timer expires.

[0012] (6) Furthermore, if on-demand system information is received, the first timer is reset.

[0013] According to one aspect of the present invention, on-demand system information can be efficiently transmitted and received between a terminal device and a base station device, thereby reducing energy consumption in the network.

[0014] Fig. 1 is a conceptual diagram of a wireless communication system according to an aspect of the present embodiment. Fig. 2 is a schematic diagram showing an example of a resource grid in a subframe according to an aspect of the present embodiment. Fig. 3 is a schematic block diagram showing the configuration of a terminal device 1 according to an aspect of the present embodiment. Fig. 4 is a schematic block diagram showing the configuration of a base station device 3 according to an aspect of the present embodiment. Fig. 5 is a diagram showing an example of an initial connection procedure according to an aspect of the present embodiment. Fig. 6 is a diagram showing an example of a process of transmitting a wake-up signal according to an aspect of the present embodiment.

[0015] The present embodiment will be described below.

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

[0017] The parameter or information indicating one or more values ​​may mean that the parameter or information includes at least a parameter or information indicating the one or more values. The upper layer parameter may be a single upper layer parameter. The upper layer parameter may be an information element (IE) including multiple parameters.

[0018] FIG. 1 is a conceptual diagram of a wireless communication system according to one aspect of the present embodiment. In FIG. 1, the wireless communication system includes terminal devices 1A to 1B and base station devices 3A to 3C. Hereinafter, the terminal devices 1A to 1B are also referred to as terminal devices 1 (UE). Hereinafter, the base station devices 3A to 3C are also referred to as base station devices 3 (gNB). Different frequencies are used for the base station devices 3A and 3B. Different frequencies are used for the base station devices 3A and 3C. For example, the base station device 3A uses a low-band frequency, and the base station devices 3B and 3C use a high-band frequency. 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 configures 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 cell configured by base station device 3B and the cell configured by base station device 3C may be referred to as a capacity cell.

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

[0020] The base station device 3A and the base station device 3B are connected by wire or wirelessly and cooperate by exchanging information. The base station device 3B may notify the base station device 3A of information related to the configuration of the wake-up signal. The base station device 3A may notify the base station device 3B of information related to the configuration of the wake-up signal.

[0021] The base station device 3A and the base station device 3C are connected by wire or wirelessly and cooperate by exchanging information. The base station device 3C may notify the base station device 3A of information related to the configuration of the wake-up signal. The base station device 3A may notify the base station device 3C of information related to the configuration of the wake-up signal.

[0022] The base station device 3 may transmit the on-demand system information for a specific period of time only, or may stop transmitting the on-demand system information when it determines that the terminal device 1 has moved out of its coverage area.

[0023] The information about the wake-up signal includes information about resources of the wake-up signal. The information about the wake-up signal includes at least one of information about time resources, information about frequency resources, and information about code resources of the wake-up signal. The information about the wake-up signal may include information about the cell ID of the corresponding cell, the cell frequency (Absolute radio-frequency channel number (ARFCN)), the frequency band and frequency position of the uplink BWP, the TDD frame structure (uplink and downlink frame structure), transmission power parameters, a control resource set / search space, a timer for prohibiting transmission of the wake-up signal, etc.

[0024] The wake-up signal may have the same structure as a 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). The MCG is a group of serving cells including at least a PCell (Primary Cell). The SCG is a group of serving cells including at least a PSCell (Primary Secondary Cell). The PCell may be a serving cell provided based on an initial connection. The MCG may be configured to include one or more SCells (Secondary Cells). The SCG may be configured to include one or more SCells. The serving cell identity is a short identifier for identifying a serving cell. The serving cell identity may be provided 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, CP-OFDM (Cyclic Prefix-Orthogonal Frequency Division Multiplexing) may be used in the downlink of the wireless communication system. Furthermore, either CP-OFDM or DFT-s-OFDM (Discrete Fourier Transform-spread-Orthogonal Frequency Division Multiplexing) may be used in the uplink of the wireless communication system. Here, DFT-s-OFDM is a communication method in which modified precoding is applied prior to signal generation in CP-OFDM. Here, modified precoding is also referred to as DFT precoding.

[0027] As shown in Fig. 1, the base station device 3 may be configured with one transceiver device (or transmission point, transmission device, reception point, reception device, transceiver point). On the other hand, in some cases, the base station device 3 may be configured to include multiple transceivers. When the base station device 3 is configured with multiple transceivers, each of the multiple transceivers may be located in a different geographical location.

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

[0029] Time unit (time unit) T ｃ = 1 / (Δf ｍａｘ ×N ｆ ) may be used to represent the length in the time domain, where Δf ｍａｘ = 480 kHz. ｆ = 4096. The constant κ may be κ = Δf ｍａｘ ×N ｆ / (Δf ｒｅｆ N ｆ，ｒｅｆ) may be 64. ｒｅｆ may be 15 kHz. ｆ，ｒｅｆ 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 radio frame may include 10 subframes, where the length of the subframes, Tsf, may be (Δfmax×Nf / 1000)×Ts=1 ms, and the number of OFDM symbols per subframe, may be Nsubframe,μsymb=Nslotsymb×Nsubframe,μslot.

[0032] An OFDM symbol is used as a time domain unit for a communication scheme used in a wireless communication system. For example, an OFDM symbol may be used as a time domain unit for CP-OFDM. Also, an OFDM symbol may be used as a time domain unit for DFT-s-OFDM.

[0033] A slot may be configured to include multiple OFDM symbols. For example, one slot may be configured by Nslotsymb consecutive OFDM symbols. For example, in a normal CP setting, Nslotsymb=14 may be used. Also, in an extended CP setting, Nslotsymb=12 may be used.

[0034] The slots may be indexed in the time domain. For example, the slot index nμs may be given in ascending order as integer values ​​ranging from 0 to Nsubframe,μslot−1 in subframes. Also, the slot index nμs,f may be given in ascending order as integer values ​​ranging from 0 to Nframe,μslot−1 in radio frames.

[0035] Fig. 2 is a diagram showing an example of the configuration of a resource grid according to one aspect of this embodiment. In the resource grid of Fig. 2, the horizontal axis represents the OFDM symbol index lsym, and the vertical axis represents the subcarrier index ksc. The resource grid of Fig. 2 includes Nsize, μgrid, x × NRBsc subcarriers and Nsubframe, μsymb OFDM symbols. Here, Nsize, μgrid, and x represent the bandwidth of the SCS-specific carrier. The values ​​of Nsize, μgrid, and x are expressed in resource blocks.

[0036] Within the resource grid, a resource identified by a subcarrier index ksc and an OFDM symbol index lsym is also called a resource element (RE).

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

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

[0039] An example of the configuration of the terminal device 1 according to one aspect of this embodiment will be described below.

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

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

[0042] For example, the radio transceiver 10 may generate a baseband signal of an uplink physical channel. Here, a transport block delivered from a higher layer on the UL-SCH may be mapped to the uplink physical channel. For example, the radio transceiver 10 may generate a baseband signal of an uplink physical signal.

[0043] For example, the radio transceiver 10 may attempt to detect information transmitted by a downlink physical channel. Here, a transport block of the information transmitted by the downlink physical channel may be delivered to a higher layer on a DL-SCH. For example, the radio transceiver 10 may attempt to detect information transmitted by a downlink physical signal.

[0044] The receiver of the terminal device 1 receives the PDCCH. The receiver processing unit of the terminal device 1 performs processing to receive the PDCCH in the downlink frequency band (cell, component carrier, carrier). The receiver processing unit of the terminal device 1 performs processing such as demodulation and decoding on the PDCCH. The receiver processing unit of the terminal device 1 performs processing to receive the PDCCH and detect downlink control information (DCI format). The receiver processing unit of the terminal device 1 decodes information included in the detected DCI format and outputs the decoded results to each unit.

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

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

[0047] The information about the wake-up signal includes at least information indicating the resource of the wake-up signal, which means at least one of time resource (radio frame, subframe, OFDM symbol) (period, offset, duration), frequency resource (BWP, resource block) (start position, number), and code resource (preamble, sequence).

[0048] There may be multiple pieces of information related to a wakeup signal. Information related to one wakeup signal may include multiple pieces of information indicating wakeup signal resources. For example, information indicating two wakeup signal resources (WakeUp signal configuration #1, WakeUp signal configuration #2) is configured. The information related to each wakeup signal includes information identifying the corresponding cell, such as a cell ID. The information indicating the respective wakeup signal resources is associated with information identifying the corresponding cell, such as a cell ID. For example, the terminal device 1 selects either a cell corresponding to WakeUp signal configuration #1 or a cell corresponding to WakeUp signal configuration #2 and transmits a wakeup signal. For example, the terminal device 1 cannot select a cell corresponding to WakeUp signal configuration #1, but selects a cell corresponding to WakeUp signal configuration #2 and transmits a wakeup signal. For example, the terminal device 1 cannot select both a cell corresponding to WakeUp signal configuration #1 and a cell corresponding to WakeUp signal configuration #2, and does not transmit a wakeup signal.

[0049] The receiving unit of the 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 a PDSCH. The response to the wake-up signal may be a MAC CE. The response to the wake-up signal may use a PDCCH including a DCI format scrambled with a specific RNTI. The receiving unit of the terminal device 1 may monitor the response to the wake-up signal only in a specific time window after transmitting the wake-up signal.

[0050] The receiving unit of the terminal device 1 receives the random access response. The receiving unit of the terminal device 1 monitors the random access response within a random access response window. The receiving unit of the terminal device 1 monitors the contention resolution message within a contention resolution timer.

[0051] The receiver of the terminal device 1 receives the SSB and selects the SSB with the best reception conditions.

[0052] A transmitter (also referred to as a transmission processing unit) of the terminal device 1 transmits a HARQ-ACK. The transmission processing unit of the terminal device 1 transmits a HARQ-ACK for a PDSCH. The transmission processing unit of the terminal device 1 transmits the HARQ-ACK in an uplink frequency band (cell, component carrier, carrier).

[0053] The transmitting unit of the terminal device 1 transmits a random access preamble. The transmitting unit of the terminal device 1 transmits the random access preamble using a preamble format. The transmission processing unit of the terminal device 1 transmits the random access preamble using a PRACH. The transmitting unit of the terminal device 1 transmits the RACH at a RACH occasion. The transmitting unit of the terminal device 1 transmits the RACH at a periodically set RACH occasion. The transmitting unit of the terminal device 1 selects a RACH occasion from one or more RACH occasions corresponding to an SSB selected by the receiving unit of the terminal device 1, and transmits a RACH (random access preamble) at the selected RACH occasion.

[0054] The transmitting unit of the terminal device 1 retransmits the random access preamble. The transmitting unit of the terminal device 1 retransmits the random access preamble on multiple RACH occasions. The transmitting unit of the terminal device 1 may retransmit the random access preamble up to a set maximum number (maximum number of retransmissions of the random access preamble). The transmitting unit of the terminal device 1 may perform power ramping when retransmitting the random access preamble. The transmitting unit of the terminal device 1 may set the transmission power of the random access preamble based on the initial random access preamble power. The transmitting unit of the terminal device 1 may randomly select a random access preamble from multiple random access preambles set for contention-based random access.

[0055] The transmitter of the terminal device 1 transmits a wake-up signal. The transmitter of the terminal device 1 transmits the wake-up signal in a first cell. The transmitter of the terminal device 1 may transmit a random access preamble as the wake-up signal. The transmitter of the terminal device 1 may transmit the random access preamble using a preamble format set as a resource for the wake-up signal. The transmitter of the terminal device 1 may transmit the random access preamble using a PRACH set as a resource for the wake-up signal. The transmitter of the terminal device 1 may transmit the wake-up signal on a RACH occasion set as a resource for the wake-up signal. The transmitter of the terminal device 1 may select a RACH occasion from one or more RACH occasions corresponding to an SSB selected by the receiver of the terminal device 1 for one or more RACH occasions set as a resource for the wake-up signal, and transmit the wake-up signal on the selected RACH occasion.

[0056] The transmitting unit of the terminal device 1 retransmits a wake-up signal. The transmitting unit of the terminal device 1 retransmits a random access preamble set as a resource for the wake-up signal. The transmitting unit of the terminal device 1 retransmits the wake-up signal when it does not detect a response to the transmitted wake-up signal. The transmitting unit of the terminal device 1 may retransmit the random access preamble set as a resource for the wake-up signal on multiple RACH occasions. The transmitting unit of the terminal device 1 may retransmit the random access preamble set as a resource for the wake-up signal up to a set maximum number of times.

[0057] The transmitter of the terminal device 1 performs power ramping when retransmitting a random access preamble using a power ramping value set as a wake-up signal resource. The transmitter of the terminal device 1 measures a counter (first counter) related to power ramping. When the transmitter of the terminal device 1 transmits a wake-up signal, does not detect a response to the transmitted wake-up signal, and retransmits the wake-up signal, the transmitter increments the counter related to power ramping by one. The transmitter of the terminal device 1 uses a step (first step) as a parameter related to power ramping. The first step specifies the granularity of how much power is increased by power ramping. For example, the first step is set to one of values ​​(sizes) of 2 dB, 4 dB, or 6 dB. The transmitter of the terminal device 1 increases transmission power by an amount equal to the first step multiplied by the value of the first counter, and retransmits the wake-up signal.

[0058] When the transmitting unit of the terminal device 1 detects a response to the transmitted wake-up signal, it starts counting a timer (first timer). The transmitting unit of the terminal device 1 stops retransmitting the wake-up signal until the first timer expires. Information regarding the value of the first timer is included in the configuration of the wake-up signal. When the terminal device 1 receives on-demand system information, the transmitting unit of the terminal device 1 resets the first timer. When the first timer expires, the transmitting unit of the terminal device 1 resumes retransmission of the wake-up signal. The transmitting unit of the terminal device 1 retransmits the wake-up signal by applying the most recent amount of power ramping used for the wake-up signal for which a response was previously detected. In other words, when the transmitting unit of the terminal device 1 detects a response to the transmitted wake-up signal, it maintains the first counter without resetting it. When the first timer expires, the transmitting unit of the terminal device 1 calculates the amount of power ramping using the first counter whose value is maintained, and uses the calculated amount to determine the transmission power of the retransmitted wake-up signal.

[0059] In this way, when the first timer expires, the terminal device 1 continues to use the amount of power ramping that was applied to the wake-up signal that was previously (last time) properly detected in the base station device 3, so that the retransmitted wake-up signal can be properly detected in the base station device 3, a request for on-demand system information transmission can be quickly notified to the base station device 3, and unnecessary retransmission of wake-up signals can be suppressed, thereby reducing interference to surrounding areas.

[0060] Note that, after the first timer expires, if the terminal device 1 retransmits the wake-up signal and does not detect a response to the transmitted wake-up signal, the transmitter of the terminal device 1 may further increase the amount of power ramping and retransmit the wake-up signal. The transmitter of the terminal device 1 increments the first counter related to power ramping by one. While the first timer is timing, the propagation path conditions may change, causing the received power of the wake-up signal from the terminal device 1 at the base station device 3 to decrease, potentially making it impossible for the base station device 3 to properly detect the wake-up signal. After the first timer expires, as before the first timer started timing, the terminal device 1 may apply further power ramping if it does not detect a response to the transmitted wake-up signal, thereby achieving appropriate detection accuracy of the wake-up signal at the base station device 3.

[0061] The transmitter of the terminal device 1 may select a wake-up signal that can be transmitted and transmit the selected wake-up signal. The terminal device 1 may select a cell to transmit the wake-up signal from among one or more cells whose reception quality is equal to or higher than a certain threshold.

[0062] The transmitter of the terminal device 1 transmits signals to the plurality of base station devices 3. The transmitter of the terminal device 1 transmits signals to the plurality of base station devices 3 at different frequencies.

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

[0064] A media access control layer processing unit (MAC layer processing unit) 15 included in the upper layer processing unit 14 performs MAC layer processing.

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

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

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

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

[0069] The radio resource control layer processing unit 16 receives information indicating the configuration of a wake-up signal through RRC signaling (system information). The information indicating the configuration of the wake-up signal includes information indicating resources for the wake-up signal. The information indicating the configuration of the wake-up signal includes information indicating a value of a first timer (a value set when the timer starts timing) that prohibits transmission of the wake-up signal. The information indicating the configuration of the wake-up signal may include information indicating a maximum number of times the wake-up signal is transmitted. The information indicating the configuration of the wake-up signal may include information indicating a value of a response window for the wake-up signal. The information indicating the configuration of the wake-up signal may include information indicating a power ramping value for the wake-up signal (a size of the power ramping step). The information indicating the configuration of the wake-up signal may include information indicating an initial power value for the wake-up signal.

[0070] The radio 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, parameters related to the first timer, etc.) for the transmission unit of the terminal device 1. When transmitting a wake-up signal, the transmission unit of the terminal device 1 generates and transmits the wake-up signal using the parameters set by the radio resource control layer processing unit 16.

[0071] The radio resource control layer processing unit 16 sets a RACH preamble format (PRACH preamble format) to be used in an uplink slot based on RRC signaling (system information) received from the base station device 3. As the RACH preamble format (PRACH preamble format), a short preamble format or a long preamble format is set.

[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 (3 ms) or 4 slots (4 ms). In NR, the long preamble format is a RACH preamble format of Format 1 or 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 (1 ms). In NR, the short preamble format is Format 0 or Format 3.

[0073] A medium access control layer processing unit (MAC layer processing unit) 15 performs MAC layer processing such as HARQ operation, decoding of MAC CE and processing based on the decoding result.

[0074] The radio resource control layer processing unit 16 may include functional information generated based on the functions provided by the terminal device 1 in an RRC message and transmit the information to the base station device 3.

[0075] The wireless transmission / reception unit 10 performs modulation, encoding, and transmission processes. The wireless transmission / reception unit 10 generates a physical signal by encoding data (transport blocks), modulating it, and generating a baseband signal (converting it into a time-continuous signal), and transmits the generated physical signal to the base station device 3 or the terminal device 1.

[0076] The radio transmission / reception unit 10 performs demodulation processing, decoding processing, and reception processing. The radio transmission / reception unit 10 outputs a transport block from the information detected based on the demodulation processing and decoding processing of the received physical signal to the upper layer processing unit 14 on the DL-SCH.

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

[0078] The baseband unit 13 converts the analog signal input from the RF unit 12 into a digital signal. The baseband unit 13 removes a portion corresponding to a 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, and extracts a 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 unnecessary frequency components from the analog signal input from the baseband unit 13, and upconverts the analog signal to a carrier frequency to generate an RF signal. The RF unit 12 transmits the RF signal via the antenna unit 11. The RF unit 12 also amplifies the power. The RF unit 12 may also have a function to control transmission power. The RF unit 12 is also referred to as a transmission power control unit.

[0081] An example of the configuration of the base station device 3 according to one aspect of this embodiment will be described below.

[0082] 4 is a schematic block diagram showing the configuration of a base station device 3 according to one aspect of the present embodiment. As shown in the figure, the base station device 3 includes a radio transmission / reception unit 30 and a higher layer processing unit 34. The radio transmission / reception unit 30 includes an antenna unit 31, an RF (Radio Frequency) unit 32, and a baseband unit 33. The higher layer processing unit 34 includes a medium access control layer processing unit 35 and a radio resource control layer processing unit 36. The radio transmission / reception unit 30 is also referred to as a transmitter, a receiver, or a physical layer processing unit.

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

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

[0085] The radio resource control layer processing unit 36 ​​included in the upper layer processing unit 34 performs RRC layer processing. The RRC layer processing may include some or all of broadcast signal management, RRC connection / RRC idle state management, and RRC reconfiguration. The radio resource control layer processing unit 36 ​​generates downlink data (transport blocks) to be allocated to the PDSCH, system information, RRC messages, MAC CEs, etc., or acquires them from upper nodes, and outputs them to the radio transceiver unit 30.

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

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

[0088] The radio resource control layer processing unit 36 ​​sets a control resource set for the terminal device 1. Multiple PDCCH candidates are configured (set) within the set control resource set. The radio resource control layer processing unit 36 ​​sets a search space for the terminal device 1. The radio resource control layer processing unit 36 ​​sets a DCI format to be monitored in the search space for the terminal device 1.

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

[0090] The radio resource control layer processing unit 36 ​​performs settings related to a plurality of search areas, each of which is indexed.

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

[0092] The radio resource control layer processing unit 36 ​​sets RACH occasions and sets the cycle of the RACH occasions.

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

[0094] The radio resource control layer processing unit 36 ​​sets the configuration of the wake-up signal. The radio resource control layer processing unit 36 ​​sets resources for the wake-up signal. The radio resource control layer processing unit 36 ​​may set a maximum number of times the wake-up signal is transmitted. The radio resource control layer processing unit 36 ​​may set a value of a response window for the wake-up signal. The radio resource control layer processing unit 36 ​​may set a power ramping value (power ramping step size) for the wake-up signal. The radio resource control layer processing unit 36 ​​may set an initial power value for the wake-up signal. The radio resource control layer processing unit 36 ​​may set a value of a timer (first timer) that prohibits transmission of the wake-up signal. The radio resource control layer processing unit 36 ​​transmits information indicating the configuration of the wake-up signal in system information from the transmitting unit of the base station device 3.

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

[0096] The functions of the radio transceiver unit 30 are similar to those of the radio transceiver unit 10, and therefore description thereof will be omitted where appropriate. The radio transceiver unit 30 performs physical layer processing. Here, the physical layer processing may include some or all of the following: generation of a baseband signal of a physical channel, generation of a baseband signal of a physical signal, detection of information transmitted by the physical channel, and detection of information transmitted by the physical signal. Furthermore, the physical layer processing may include mapping processing of a transport channel to a physical channel. Here, the baseband signal is also referred to as a time-continuous signal.

[0097] The radio transceiver 30 may perform one or both of demodulation and decoding. The radio transceiver 30 may deliver a transport block of information detected based on the demodulation and decoding of a received physical signal to a higher layer on the UL-SCH. For example, the radio transceiver 30 may generate a baseband signal of a downlink physical channel. Here, the transport block delivered from a higher layer on the DL-SCH may be allocated to the downlink physical channel. For example, the radio transceiver 30 may generate a baseband signal of a downlink physical signal.

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

[0099] The radio transceiver unit 30 grasps the SS (Search space) configured in the terminal device 1. The radio transceiver unit 30 grasps the search space within the control resource set configured in the terminal device 1. The radio transceiver unit 30 grasps the PDCCH candidates monitored in the terminal device 1 to grasp the search space. The radio transceiver unit 30 grasps which control channel elements constitute each PDCCH candidate monitored in the terminal device 1 (grabs the numbers of the control channel elements in which the PDCCH candidate is constituted). The radio transceiver unit 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 in the control resource set configured as the search space of the terminal device. The SS grasping unit grasps the PDCCH candidates (the number of PDCCH candidates, the numbers of the PDCCH candidates) configured in the search space of the control resource set of the terminal device 1.

[0100] The SS ascertaining unit ascertains the configuration of the search space within the control resource set (the number of PDCCH candidates, the OFDM symbols of the PDCCH candidates, and the aggregation level of the PDCCH candidates). The transmitting unit (transmission processing unit) of the radio transceiver unit 30 transmits the PDCCH to the terminal device 1 using the PDCCH candidates within the search space of the control resource set.

[0101] A transmitter (also referred to as a transmission processing unit) of the base station device 3 transmits the PDCCH. The transmission processing unit of the base station device 3 transmits the PDCCH using PDCCH candidates monitored in the terminal device 1. The transmission processing unit of the base station device 3 transmits the PDCCH using resources corresponding to PDCCH candidates in a search space set for the terminal device 1. The transmission processing unit of the base station device 3 transmits the PDCCH using PDCCH candidates in a search space where PDCCH monitoring is performed in the terminal device 1, among multiple search spaces set for the terminal device 1.

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

[0103] The receiving unit of the base station device 3 receives the RACH and performs a process of detecting the random access preamble.

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

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

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

[0107] The RF unit 32 may convert the signal received via the antenna unit 31 into a baseband signal and remove unnecessary frequency components. The RF unit 32 outputs the baseband signal to the baseband unit 33.

[0108] The baseband unit 33 may digitize the baseband signal input from the RF unit 32. The baseband unit 33 may remove a portion corresponding to a 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 a frequency domain signal.

[0109] The baseband unit 33 may generate a baseband signal by performing an Inverse Fast Fourier Transform (IFFT) on the physical signal. The baseband unit 33 may add a CP to the generated baseband signal. The baseband unit 33 may convert the baseband signal to which the CP has been added into an analog signal. The baseband unit 33 may output the analog baseband signal to the RF unit 32.

[0110] The RF unit 32 may remove unnecessary frequency components from the baseband signal input from the baseband unit 33. The RF unit 32 may up-convert the baseband signal to a carrier frequency to generate an RF signal. The RF unit 32 may transmit the RF signal via the antenna unit 31. The RF unit 32 may also have a function of controlling transmission power.

[0111] Each of the units designated by reference numerals 10 to 16 in the terminal device 1 may be configured as a circuit. Each of the units designated by reference numerals 30 to 36 in the base station device 3 may be configured as a circuit.

[0112] Physical channels and physical signals according to various aspects of the present embodiment will be described below. Physical signals are a general term for downlink physical channels, downlink physical signals, uplink physical channels, and uplink physical channels. Physical channels are a general term for downlink physical channels and uplink physical channels. Physical signals are a general term for downlink physical signals and uplink physical signals.

[0113] An uplink physical channel may correspond to a set of resource elements carrying information generated in a higher layer. An uplink physical channel is a physical channel used in an uplink component carrier. An uplink physical channel may be transmitted by the radio transceiver unit 10. An uplink physical channel may be received by the radio transceiver unit 30. In a wireless communication system according to one aspect of the present embodiment, at least some or all of the following uplink physical channels are used: PUCCH (Physical Uplink Control CHannel) PUSCH (Physical Uplink Shared CHannel) PRACH (Physical Random Access CHannel)

[0114] The PUCCH may be used to transmit (transmit) uplink control information (UCI). The uplink control information may be arranged in the PUCCH. The radio transceiver 10 may transmit the PUCCH in which the uplink control information is arranged. The radio transceiver 30 may receive the PUCCH in which the uplink control information is arranged.

[0115] The uplink control information (uplink control information bits, uplink control information sequence, uplink control information type) includes some or all of channel state information (CSI), scheduling request (SR), and hybrid automatic repeat request ACKnowledgement (HARQ-ACK) information. Note that the uplink control information may also include information not described above.

[0116] The channel state information is also referred to as a channel state information bit or a channel state information sequence. The scheduling request is also referred to as a scheduling request bit or a scheduling request sequence. The HARQ-ACK information is also referred to as a HARQ-ACK information bit or a HARQ-ACK information sequence.

[0117] The HARQ-ACK information may be configured by HARQ-ACK bits corresponding to one transport block (TB). The HARQ-ACK bits may indicate an acknowledgement (ACK) or a negative acknowledgement (NACK) corresponding to the transport block. The ACK may indicate that the transport block has been decoded successfully. The NACK may indicate that the transport block has not been decoded successfully. The HARQ-ACK information may include one or more HARQ-ACK bits.

[0118] The HARQ-ACK for a transport block is also referred to as the HARQ-ACK for a PDSCH. Here, the "HARQ-ACK for a PDSCH" may refer to the HARQ-ACK for a transport block included in the PDSCH.

[0119] The 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, this is also referred to as "a positive SR is transmitted (communicated)." A positive SR may indicate that UL-SCH resources for initial transmission are requested by the terminal device 1. When the scheduling request bit indicates a negative SR, this is also referred to as "a negative SR is transmitted (communicated)." A negative SR may indicate that UL-SCH resources for initial transmission are not requested by the terminal device 1.

[0120] The channel state information may include some or all of a Channel Quality Indicator (CQI), a Precoder Matrix Indicator (PMI), and a Rank Indicator (RI). The CQI is an indicator related to the quality of the propagation path (e.g., propagation strength) or the quality of the physical channel, the PMI is an indicator related to the precoder, and the RI is an indicator related to the transmission rank (or the number of transmission layers).

[0121] The channel state information is an indicator related to the reception state of a physical signal (e.g., CSI-RS) used for channel measurement. The value of the channel state information may be determined by the terminal device 1 based on the reception state assumed by the physical signal used for channel measurement. The channel measurement may include interference measurement.

[0122] The PUCCH may have a PUCCH format, where the PUCCH format may be a format of physical layer processing of the PUCCH, or a format of information transmitted using the PUCCH.

[0123] The PUSCH may be transmitted to convey one or both of uplink control information and a transport block. The PUSCH may be used to convey one or both of uplink control information and a transport block. The PUSCH may be used to transmit at least some or all of the transport block, HARQ-ACK, channel state information, and a scheduling request. The PUSCH is used at least to transmit a random access message 3. The PUSCH may be used to transmit information not described above. The terminal device 1 may transmit a PUSCH in which one or both of uplink control information and a transport block are allocated. The base station device 3 may receive a PUSCH in which one or both of uplink control information and a transport block are allocated.

[0124] The PRACH may be transmitted to convey an index of the random access preamble (random access message 1). The terminal device 1 may transmit the PRACH. The base station device 3 may receive the PRACH. The terminal device 1 may transmit the random access preamble on the PRACH. The base station device 3 may receive the random access preamble on the PRACH.

[0125] The PRACH is used at least to transmit a random access preamble (random access message 1) and may be used at least to indicate some or all of the following: an initial connection establishment procedure, a handover procedure, a connection re-establishment procedure, synchronization (timing adjustment) for PUSCH transmission, and a request for resources for the PUSCH.

[0126] The uplink physical signal may correspond to a set of resource elements. The uplink physical signal does not have to be used to transmit information generated in a higher layer. The uplink physical signal may be used to transmit information generated in the physical layer. The uplink physical signal may be a physical signal used in an uplink component carrier. The radio transceiver unit 10 may transmit the uplink physical signal. The radio transceiver unit 30 may receive the uplink physical signal. In the uplink of the wireless communication system according to one aspect of the present embodiment, some or all of the following uplink physical signals may be used: UL DMRS (UpLink Demodulation Reference Signal) SRS (Sounding Reference Signal) UL PTRS (UpLink Phase Tracking Reference Signal) WakeUp Signal

[0127] UL DMRS is a general term for DMRS for PUSCH and DMRS for PUCCH.

[0128] A set of antenna ports for DMRSs for a PUSCH (DMRSs associated with a PUSCH, DMRSs included in a PUSCH, and DMRSs 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 DMRSs for a PUSCH may be the same as the set of antenna ports for the PUSCH.

[0129] The propagation path of the PUSCH may be estimated from the DMRS for the PUSCH.

[0130] 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.

[0131] The propagation path of the PUCCH may be estimated from the DMRS for the PUCCH.

[0132] The wake-up signal is used to trigger the transmission of on-demand system information (SIB1), and may have the same signal configuration as PRACH.

[0133] The downlink physical channel may correspond to a set of resource elements that transmit information generated in a higher layer. The downlink physical channel may be a physical channel used in a downlink component carrier. The radio transceiver unit 30 may transmit the downlink physical channel. The radio transceiver unit 10 may receive the downlink physical channel. In the downlink of the wireless communication system according to one aspect of the present embodiment, some or all of the following downlink physical channels may be used: PBCH (Physical Broadcast Channel) PDCCH (Physical Downlink Control Channel) PDSCH (Physical Downlink Shared Channel)

[0134] The PBCH is transmitted to carry Master Information Blocks (MIBs) and / or physical layer control information (PLIC), which is information generated in the physical layer. MIBs are RRC messages delivered from higher layers on the Broadcast Control Channel (BCCH).

[0135] The PDCCH is used at least for transmitting (transmitting) downlink control information (DCI). The downlink control information may be allocated to the PDCCH. The terminal device 1 may receive the PDCCH in which the downlink control information is allocated. The base station device 3 may transmit the PDCCH in which the downlink control information is allocated.

[0136] The downlink control information may be transmitted with a DCI format. The DCI format may be interpreted as a format of the downlink control information. The DCI format may also be interpreted as a set of downlink control information set to a certain format of the downlink control information.

[0137] The base station device 3 may notify the terminal device 1 of downlink control information using a PDCCH with a DCI format. Here, the terminal device 1 may monitor the PDCCH to acquire the downlink control information. Unless otherwise specified, the DCI format and the downlink control information may be described as equivalent. For example, the base station device 3 may include the downlink control information in a DCI format and transmit it to the terminal device 1. Furthermore, the terminal device 1 may control the radio transceiver unit 10 using the downlink control information included in the detected DCI format.

[0138] The downlink control information may include at least one of a downlink grant (DL grant) or an uplink grant (UL grant). A DCI format used for scheduling the PDSCH is also referred to as a downlink DCI format. A DCI format used for scheduling the PUSCH is also referred to as an uplink DCI format. A downlink grant is also referred to as a downlink assignment (DL assignment) or a downlink allocation (DL allocation).

[0139] DCI formats include DCI format 0_0, DCI format 0_1, DCI format 1_0, and DCI format 1_1. The uplink DCI format is a general term for DCI format 0_0, DCI format 0_1, etc. The downlink DCI format is a general term for DCI format 1_0, DCI format 1_1, etc.

[0140] DCI format 0_0 is used for scheduling a PUSCH assigned to a certain cell. DCI format 0_1 ​​is used for scheduling a PUSCH assigned to a certain cell. DCI format 1_0 is used for scheduling a PDSCH assigned to a certain cell. DCI format 1_1 is used for scheduling a PDSCH assigned to a certain cell.

[0141] DCI format 2_9 may be used to activate or deactivate the cell DTX / DRX configuration of one or more serving cells for one or more UEs. DCI format 2_9 may be transmitted with a CRC scrambled by the NES-RNTI. DCI format 2_9 includes some or all of the following information: Block number Cell DTX / DRX indication

[0142] The DCI format may include a DCI format identification field (Identifier for DCI formats field) indicating whether the DCI format is an uplink DCI format or a downlink DCI format. The DCI format may include a frequency domain resource assignment field indicating frequency domain resource assignment. The DCI format may include a time domain resource assignment field indicating time domain resource assignment. 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 a modulation scheme and a target coding rate of a channel. The DCI format may include a CSI request field indicating an instruction for reporting CSI. The DCI format may include a BWP field indicating a BWP to which a channel is assigned. A PDSCH_HARQ feedback timing indicator field (PDSCH to HARQ feedback timing indicator field) indicating the timing at which HARQ-ACK is transmitted may be included in the DCI format. A PUCCH resource indicator field (PUCCH resource indicator field) indicating the PUCCH resource may be included in the DCI format. Note that various DCI formats may further include fields different from the above-mentioned fields.

[0143] A downlink grant is used for scheduling at least one PDSCH in one serving cell. The downlink grant is used for scheduling at least one PDSCH in the same slot as the slot in which the downlink grant is transmitted. The downlink grant may be used for scheduling a PDSCH in a slot different from the slot in which the downlink grant is transmitted. The uplink grant is used for scheduling at least one PUSCH in one serving cell.

[0144] The PDSCH may be transmitted to transmit a transport block. The PDSCH may be used to transmit a transport block. The transport block may be allocated to the PDSCH. The base station device 3 may transmit the PDSCH in which the transport block is allocated. The terminal device 1 may receive the PDSCH in which the transport block is allocated.

[0145] The downlink physical signal may correspond to a set of resource elements. The downlink physical signal does not have to be used to transmit information generated in a higher layer. The downlink physical signal may be used to transmit information generated in a physical layer. The downlink physical signal may be a physical signal used in a downlink component carrier. The radio transceiver unit 10 may receive the downlink physical signal. The radio transceiver unit 30 may transmit the downlink physical signal. In the downlink of the radio communication system according to one aspect of the present embodiment, at least some or all of the following downlink physical signals may be used: Synchronization signal (SS) DL DMRS (DownLink Demodulation Reference Signal) CSI-RS (Channel State Information-Reference Signal) DL PTRS (DownLink Phase Tracking Reference Signal)

[0146] The synchronization signal is used by the terminal device 1 to synchronize the frequency domain and / or the time domain of the downlink. The synchronization signal is a general term for a PSS (Primary Synchronization Signal) and an SSS (Secondary Synchronization Signal).

[0147] An SS block (SS / PBCH block) is composed of at least a PSS, an SSS, and some or all of the PBCH.

[0148] The antenna ports for the PSS, SSS, PBCH, and DMRS for the PBCH may be the same.

[0149] The PBCH on which the PBCH symbol is transmitted at a certain antenna port may be estimated by the DMRS for the PBCH that is placed in the slot to which the PBCH is mapped and is included in the SS / PBCH block to which the PBCH belongs.

[0150] DL DMRS is a general term for DMRS for PBCH, DMRS for PDSCH, and DMRS for PDCCH.

[0151] A set of antenna ports for a DMRS for a PDSCH (a DMRS associated with a PDSCH, a DMRS included in a PDSCH, or a DMRS corresponding to a PDSCH) may be determined based on the set of antenna ports for the PDSCH. For example, the set of antenna ports for a DMRS for a PDSCH may be the same as the set of antenna ports for the PDSCH.

[0152] A propagation path of a PDSCH may be estimated from a DMRS for the PDSCH. If a set of resource elements carrying a certain PDSCH symbol and a set of resource elements carrying a DMRS symbol for the PDSCH are included in the same precoding resource group (PRG), the PDSCH carrying the PDSCH symbol for a certain antenna port may be estimated by the DMRS for the PDSCH.

[0153] The antenna port of the DMRS for the PDCCH (DMRS related to the PDCCH, DMRS included in the PDCCH, DMRS corresponding to the PDCCH) may be the same as the antenna port for the PDCCH.

[0154] The propagation path of a PDCCH may be estimated from the DMRS for the PDCCH. If the same precoder is applied (or assumed to be applied) to a set of resource elements on which a certain PDCCH symbol is transmitted and a set of resource elements on which a DMRS symbol for the PDCCH is transmitted, the PDCCH on which the PDCCH symbol for a certain antenna port is transmitted may be estimated by the DMRS for the PDCCH.

[0155] The BCH (Broadcast CHannel), UL-SCH (Uplink-Shared CHannel), and DL-SCH (Downlink-Shared CHannel) are transport channels.

[0156] The BCH of the transport layer may be mapped to the PBCH of the physical layer, i.e., the transport block delivered from higher layers on the BCH of the transport layer may be placed on the PBCH of the physical layer, and the UL-SCH of the transport layer may be mapped to the PUSCH of the physical layer.

[0157] The transport layer may apply Hybrid Automatic Repeat reQuest (HARQ) to the transport block.

[0158] The BCCH (Broadcast Control CHannel), CCCH (Common Control CHannel), and DCCH (Dedicated Control CHannel) are logical channels. For example, the BCCH may be used to deliver an RRC message including an MIB or an RRC message including system information. The CCCH may also be used to transmit an RRC message including RRC parameters common to multiple terminal devices 1. Here, the CCCH may be used, for example, for terminal devices 1 that are not RRC connected. The DCCH may also be used to transmit an RRC message dedicated to a certain terminal device 1. Here, the DCCH may be used, for example, for terminal devices 1 that are RRC connected.

[0159] The BCCH may be mapped to the BCH or DL-SCH. That is, an RRC message containing MIB information may be delivered on the BCH. An RRC message containing system information other than MIB information may be delivered on the DL-SCH. The CCCH may be mapped to the DL-SCH or UL-SCH. That is, an RRC message mapped to the CCCH may be delivered on the DL-SCH or UL-SCH. The DCCH may be mapped to the DL-SCH or UL-SCH. That is, an RRC message mapped to the DCCH may be delivered on the DL-SCH or UL-SCH.

[0160] The UL-SCH may be mapped to the PUSCH, the DL-SCH may be mapped to the PDSCH, and the BCH may be mapped to the PBCH.

[0161] The media access control layer processing unit 15 may perform a random access procedure and may select a RACH occasion for transmitting a random access preamble.

[0162] For example, downlink control information including a downlink grant or an uplink grant is transmitted and received on a PDCCH, including a C-RNTI (Cell-Radio Network Temporary Identifier).

[0163] One physical channel may be mapped to one serving cell, and one physical channel may be mapped to one BWP configured on one carrier included in one serving cell.

[0164] One or more control resource sets (CORESETs) may be configured in the terminal device 1. The 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 the PDCCH may include one or more PDCCH candidates and / or sets of PDCCH candidates. Furthermore, monitoring the PDCCH may include monitoring and detecting the PDCCH and / or a DCI format transmitted via the PDCCH.

[0165] A plurality of control resource sets may be configured in the terminal device 1, and an index (control resource set index) may be assigned to each control resource set. One or more control channel elements (CCEs) may be configured in the control resource set, and an index (CCE index) may be assigned to each CCE.

[0166] A set of PDCCH candidates monitored by the terminal device 1 is defined in terms of a search space. That is, the set of PDCCH candidates monitored by the terminal device 1 is given by the search space.

[0167] The search space may be configured to include one or more PDCCH candidates of one or more aggregation levels. The aggregation level of the PDCCH candidates may indicate the number of CCEs constituting the PDCCH. The PDCCH candidates may be mapped to one or more CCEs.

[0168] The search area set may be configured to include at least one or more search areas, and an index (search area index) may be assigned to each search area.

[0169] Each search space set may be associated with at least one control resource set, each search space set may be included in one control resource set, and each search space set may be given an index of the control resource set associated with that search space set.

[0170] The terminal device 1 can detect the PDCCH and / or DCI for the terminal device 1 by blindly detecting PDCCH candidates included in the search space within the control resource set.

[0171] In various aspects of the present embodiment, unless otherwise specified, the number of resource blocks refers to the number of resource blocks in the frequency domain.

[0172] The terminal device 1 transmits uplink control information (UCI) to the base station device 3. The terminal device 1 may multiplex the UCI onto a PUCCH and transmit the same. The terminal device 1 may multiplex the UCI onto a PUSCH and transmit the same. The UCI may include at least one of downlink channel state information (CSI), a scheduling request (SR) indicating a request for PUSCH resources, and a hybrid automatic repeat request ACKnowledgement (HARQ-ACK) for downlink data (Transport block, Medium Access Control Protocol Data Unit: MAC PDU, Downlink-Shared Channel: DL-SCH, Physical Downlink Shared Channel: PDSCH).

[0173] 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.

[0174] If data is successfully decoded, an ACK is generated for the data. If data is not successfully decoded, a NACK is generated for the data. The HARQ-ACK may include at least a HARQ-ACK bit corresponding to at least one transport block. The HARQ-ACK bit may indicate an ACK (ACKnowledgement) or a NACK (Negative-ACKnowledgement) corresponding to one or multiple transport blocks. The HARQ-ACK may include at least a HARQ-ACK codebook including one or more HARQ-ACK bits. The HARQ-ACK bit corresponding to one or multiple transport blocks may correspond to a PDSCH including the one or multiple transport blocks.

[0175] HARQ control for one transport block may be referred to as an HARQ process. One HARQ process identifier may be assigned to each HARQ process. The DCI format includes a field indicating the HARQ process identifier (HARQ process number).

[0176] An NDI (New Data Indicator) is indicated in the DCI format for each HARQ process. For example, an NDI field is included in a DCI format (DL assignment) including scheduling information for PDSCH. The NDI field is 1 bit. The terminal device 1 stores (stores) an NDI value for each HARQ process. The base station device 3 stores (stores) an NDI value for each HARQ process for each terminal device 1. The terminal device 1 updates the stored NDI value using the NDI field of the detected DCI format. The base station device 3 sets the updated NDI value or the NDI value that is not updated in the NDI field of the DCI format and transmits it to the terminal device 1. The terminal device 1 updates the stored NDI value using the NDI field of the detected DCI format for the HARQ process corresponding to the value of the HARQ process identifier field of the detected DCI format.

[0177] The 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). The terminal device 1 compares the NDI value previously received for a transport block of a certain HARQ process, and if the value of the detected NDI field in the DCI format is toggled, determines that the received transport block is a new transmission. When transmitting a transport block for a new transmission in a certain HARQ process, the base station device 3 toggles the NDI value stored for the HARQ process and transmits the toggled NDI to the terminal device 1. When transmitting a transport block for a retransmission in a certain HARQ process, the base station device 3 does not toggle the NDI value stored for the HARQ process and transmits an untoggled NDI to the terminal device 1. The terminal device 1 compares the NDI value previously received for a transport block of a certain HARQ process, and if the value of the detected NDI field in the DCI format is not toggled (they are the same), determines that the received transport block is a retransmission. Note that toggling here means switching to a different value.

[0178] The terminal device 1 may report HARQ-ACK information to the base station device 3 using a HARQ-ACK codebook in a slot indicated by the value of the HARQ indication field included in DCI format 1_0 corresponding to PDSCH reception or DCI format 1_1.

[0179] The 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, where k may be the number of slots indicated by the HARQ indication field included in the DCI format corresponding to the PDSCH reception. Alternatively, if the HARQ indication field is not included in the DCI format, k may be provided by a higher layer parameter.

[0180] The higher layer parameters are parameters included in higher layer signals. The higher layer signals may be RRC (Radio Resource Control) signaling or MAC CE (Medium Access Control Control Element). Here, the higher layer signals may be RRC layer signals or MAC layer signals.

[0181] The higher layer signal may be common RRC signaling. The common RRC signaling may have at least some or all of the following features C1 to C3: Feature C1) Mapped to the BCCH logical channel or the CCCH logical channel; Feature C2) Including at least the radioResourceConfigCommon information element; and Feature C3) Mapped to the PBCH.

[0182] The radioResourceConfigCommon information element (RRC signaling) may include information indicating a configuration commonly used in the serving cell. The configuration commonly used in the serving cell may include at least a RACH configuration. The RACH configuration may at least indicate one or more random access preamble indices. The RACH configuration may at least indicate time / frequency resources of a PRACH.

[0183] The information indicating the RACH setting (configuration) includes information indicating the RACH occasion. The RACH occasion may be indicated in the form of a PRACH Configuration Index. The PRACH Configuration includes the RACH preamble format, a Starting symbol indicating the starting position of the symbol where the RACH is arranged in the Slot, the PRACH duration, the RACH occasion, etc. Multiple PRACH Configurations are configured in advance, and an index called a PRACH Configuration Index is assigned to each PRACH Configuration. The RACH occasion is indicated by information indicating the subframe number where the RACH is arranged. Note that the PRACH Configuration may indicate RACH occasions for 10 subframes, and the RACH occasions may be repeated every 10 subframes. For example, the period of the RACH occasions is indicated by the number of subframes, and any one of 1, 2, 4, 8, or 16 may be indicated. For example, the period of the RACH occasions is indicated by the number of slots, and any one of 1, 2, 4, 8, 16, or 32 may be indicated. The period of the RACH may be recognized by indicating the position of the subframe in which the RACH is arranged and the position of the slot within the subframe.

[0184] The information indicating the RACH configuration (configuration) may include information indicating the number of RACH occasions per SSB (ssb-perRACH-OccasionAndCB-PreamblesPerSSB). For example, eight RACH occasions, four RACH occasions, two RACH occasions, or one RACH occasion may correspond to one SSB. For example, one RACH occasion may correspond to two SSBs. For example, one RACH occasion may correspond to four SSBs. For example, one RACH occasion may correspond to eight SSBs. For example, one RACH occasion may correspond to 16 SSBs. 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 support 4, 8, 12, 16, 24, 28, 32, 36, 40, 44, 48, 52, 56, 60, or 64 random access preambles (Contention Based preambles).

[0185] The information indicating the RACH configuration may include information indicating the maximum number of retransmissions of the random access preamble. More specifically, the maximum number of retransmissions of the random access preamble before declaring the random access procedure a failure. For example, any of 3, 4, 5, 6, 7, 8, 10, 20, 50, 100, or 200 retransmissions may be indicated.

[0186] The information indicating the RACH configuration (configuration) may include information indicating the RACH occasion, i.e., information indicating the period of the RACH occasion. The information indicating the RACH configuration (configuration) may include information indicating the maximum number of retransmissions of the random access preamble.

[0187] The information indicating the RACH configuration (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 any one of 1 to 63. Each piece of information indicating the RACH configuration (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 any one of 1 to 63.

[0188] The information indicating the RACH configuration may include information indicating the length of a random access response window used to detect a random access response. For example, the length of the random access response window may be indicated by the number of slots, and any of the number of slots, 1, 2, 4, 8, 10, 20, 40, and 80, may be indicated.

[0189] The information indicating the setting (configuration) of the RACH may include information indicating a power ramping step for the PRACH. For example, the power ramping step may be indicated as 0 dB, 2 dB, 4 dB, or 6 dB.

[0190] The information indicating the RACH configuration may include information indicating the number of PRACH transmission intervals that are frequency-multiplexed in one time instance. For example, the number of PRACH transmission intervals that are frequency-multiplexed in one time instance may be one, two, four, or eight.

[0191] The information indicating the RACH configuration may include information indicating a contention resolution timer value. For example, the contention resolution timer value may be indicated by the number of subframes, and may indicate any of the numbers of subframes: 8, 16, 24, 32, 40, 48, 56, and 64.

[0192] The information indicating the RACH setting (configuration) may include information indicating a value of an initial random access preamble power (a target power level at the network receiver side). For example, the value of the initial random access preamble power may be any value between −202 dB and −60 dB in 2 dB increments.

[0193] Information indicating the setting of the wake-up signal is included in the signal of the upper layer. Information indicating the setting of the wake-up signal is included in the system information. Information indicating the setting of the wake-up signal is included in the system information block.

[0194] The information indicating the setting (configuration) of the wakeup signal includes information indicating an occasion (WakeUp occasion) in which resources for the wakeup signal are configured. The WakeUp occasion may include any of information indicating the start position of a symbol in which the wakeup signal is arranged within a Slot, information indicating a Subframe number in which the wakeup signal is arranged, information indicating the period of the subframe in which the wakeup signal is arranged, and information indicating the period of the slot in which the wakeup signal is arranged. For example, the period of the WakeUp occasion is indicated by the number of subframes, and may be indicated as 1, 2, 4, 8, or 16. For example, the period of the WakeUp occasion is indicated by the number of slots, and may be indicated as 1, 2, 4, 8, 16, or 32. The period of the WakeUp occasion may be recognized by indicating the position of the subframe in which the wakeup signal is arranged and the position of the slot within the subframe.

[0195] The information indicating the wake-up signal configuration may include information indicating the number of wake-up occasions for each SSB. For example, eight wake-up occasions, four wake-up occasions, two wake-up occasions, or one wake-up occasion may correspond to each SSB. For example, one wake-up occasion may correspond to every two SSBs. For example, one wake-up occasion may correspond to every four SSBs. For example, one wake-up occasion may correspond to every eight SSBs. For example, one wake-up occasion may correspond to every 16 SSBs.

[0196] The information indicating the settings (configuration) of the wake-up signal may include information indicating the maximum number of times the wake-up signal can be transmitted (retransmitted), for example, 3, 4, 5, 6, 7, 8, 10, 20, 50, 100, or 200 times.

[0197] The information indicating the settings (configuration) of the wake-up signal may include information indicating the length of a response window used to detect a response to the wake-up signal. For example, the length of the response window may be indicated by the number of slots, and may be any of 1, 2, 4, 8, 10, 20, 40, or 80 slots. The response window may be a monitoring window for on-demand system information.

[0198] The information indicating the setting (configuration) of the wake-up signal may include information indicating a power ramping step for the wake-up signal. For example, the power ramping step may be indicated as 0 dB, 2 dB, 4 dB, or 6 dB.

[0199] The information indicating the setting (configuration) of the wake-up signal may include information indicating a value of an initial wake-up signal power (a target power level at the network receiver side). For example, the value of the initial wake-up signal power may be any value between −202 dB and −60 dB in 2 dB increments.

[0200] The information indicating the settings (configuration) of the wakeup signal may include information indicating the value of a wakeup signal transmission prohibition timer (first timer). For example, the value of the wakeup signal transmission prohibition timer (first timer) may be indicated by information indicating a number of milliseconds. For example, the value of the wakeup signal transmission prohibition timer (first timer) may be indicated by information indicating a number of seconds. For example, the value of the wakeup signal transmission prohibition timer (first timer) may be indicated by information indicating the number of subframes.

[0201] The higher layer signal may be dedicated RRC signaling. The dedicated RRC signaling may have at least some or all of the following features D1 to D2: Feature D1) Mapped to a DCCH logical channel; Feature D2) Including at least a radioResourceConfigDedicated information element.

[0202] The radioResourceConfigDedicated information element may include at least information indicating a setting specific to the terminal device 1. The radioResourceConfigDedicated information element may include at least information indicating a setting of a BWP. The setting of the BWP may indicate at least a frequency resource of the BWP.

[0203] For example, the MIB, the first system information, and the second system information may be included in common RRC signaling. Also, an upper layer message that is mapped to a DCCH logical channel and includes at least the radioResourceConfigCommon information element may be included in common RRC signaling. Also, an upper layer message that is mapped to a DCCH logical channel and does not include the radioResourceConfigCommon information element may be included in dedicated RRC signaling. Also, an upper layer message that is mapped to a DCCH logical channel and includes at least the radioResourceConfigDedicated information element may be included in dedicated RRC signaling.

[0204] The first system information may include at least information related to RACH resources. The first system information may include information indicating a random access configuration (RACH setting). The first system information may include at least information related to initial connection setting. The second system information may be system information other than the first system information.

[0205] The radioResourceConfigDedicated information element may include at least information related to RACH resources. The radioResourceConfigDedicated information element may include at least information related to setting up an initial connection.

[0206] The information related to reception of the PDCCH may include information related to an ID indicating a destination of the PDCCH. The ID indicating the destination of the PDCCH may be an ID used for scrambling CRC bits added to the PDCCH. The ID indicating the destination of the PDCCH is also referred to as an RNTI (Radio Network Temporary Identifier). The information related to reception of the PDCCH may include information related to an ID used for scrambling CRC bits added to the PDCCH. The terminal device 1 can attempt to receive the PDCCH based at least on the information related to the ID included in the PBCH.

[0207] The RNTI may include a Common-RNTI (C-RNTI), a Temporary C-RNTI (TC-RNTI), and a Random Access-RNTI (RA-RNTI). The C-RNTI is used at least for scheduling user data for an RRC-connected terminal device 1. The Temporary C-RNTI is used at least for scheduling a random access message 4. The Temporary C-RNTI is used at least for scheduling a PDSCH including data mapped to a CCCH in a logical channel. The RA-RNTI is used at least for scheduling a random access message 2.

[0208] The PDSCH is used at least to transmit / receive transport blocks. The PDSCH may be used at least to transmit / receive random access message 2 (random access response). The PDSCH may be used at least to transmit / receive system information including parameters used for initial access. The PDSCH may be used at least to transmit / receive random access message 4.

[0209] The terminal device 1 attempts to establish a connection with the base station device 3. Fig. 5 is a diagram showing an example of an initial connection procedure (4-step contention-based RACH procedure) according to one aspect of this embodiment. The initial connection procedure includes at least a part of steps 5101 to 5104. Here, a contention-based random access procedure will be described. Note that the contention-based random access procedure is also used for purposes other than the initial connection.

[0210] The terminal device 1 performs downlink time-frequency synchronization prior to performing step 5101. A synchronization signal (SSB) is used by the terminal device 1 to perform downlink time-frequency synchronization. The terminal device 1 uses the synchronization signal transmitted from the base station device 3.

[0211] The synchronization signal may be transmitted including an ID (cell ID) of the target cell. The synchronization signal may be transmitted including a sequence generated based at least on the cell ID. Including the cell ID in the synchronization signal may mean that the sequence of the synchronization signal is provided based on the cell ID. The synchronization signal may be transmitted by applying a beam.

[0212] The beam refers to a phenomenon in which antenna gain varies depending on the direction. The beam may be generated based at least on the directivity of the antenna. The beam may also be generated based at least on a phase shift of a carrier signal. The beam may also be generated by applying a precoder.

[0213] Step 5101 is a step in which the terminal device 1 transmits a RACH to the base station device 3. SSBs are associated with RACH occasions. Multiple RACH occasions are associated with each SSB. The terminal device 1 recognizes the RACH occasion associated with each SSB from information indicating the RACH configuration. The terminal device 1 selects a RACH occasion for transmitting a RACH from one or more RACH occasions corresponding to the detected SSB. The terminal device 1 transmits the RACH on the selected RACH occasion.

[0214] The terminal device 1 selects a RACH occasion indicated by information indicating the configuration of the random access channel. The terminal device 1 randomly selects one random access preamble from among multiple random access preambles indicated by the information indicating the configuration of the random access channel. The terminal device 1 may set the transmission power of the random access preamble based on the initial random access preamble power indicated by the information indicating the configuration of the random access channel.

[0215] Step 5102 is a step in which the base station device 3 responds to the random access message 1 to the terminal device 1. The response is also referred to as a random access message 2. The random access message 2 may be transmitted via a PDSCH. The PDSCH including the random access message 2 is scheduled by a PDCCH. The CRC bits included in the PDCCH may be scrambled by the RA-RNTI. The random access message 2 may be transmitted including a special uplink grant. The special uplink grant is also referred to as a random access response grant. The special uplink grant may be included in the PDSCH including the random access message 2. The random access response grant may include at least a Temporary C-RNTI.

[0216] The terminal device 1 determines whether it receives the random access message 2 (random access response) within the random access response window. If it determines that it has not received the random access message 2 within the random access response window, it determines that the random access message 1 (random access preamble) has not been detected in the base station device 3, and resumes the processing from step 5101.

[0217] The terminal device 1 may set a random access response window of a value (length) indicated by information indicating the configuration of the random access channel.

[0218] Step 5103 is a step in which the terminal device 1 transmits 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 transmitted via a PUSCH scheduled by a random access response grant. The random access message 3 may include an ID used to identify the terminal device 1. The ID may be an ID managed by a higher layer. The ID may be an SAE Temporary Mobile Subscriber Identity (S-TMSI). The ID may be mapped to a CCCH in a logical channel.

[0219] Step 5104 is a step in which the base station device 3 transmits a contention resolution message to the terminal device 1. The contention resolution message is also referred to as a random access message 4. After transmitting the random access message 3, the terminal device 1 monitors the PDCCH that schedules the PDSCH including the random access message 4. The random access message 4 may include a collision avoidance ID. Here, the collision avoidance ID is used to resolve collisions when multiple terminal devices 1 transmit signals using the same radio resources. The collision avoidance ID is also referred to as a UE contention resolution identity.

[0220] In step 5104, the terminal device 1 that transmitted the random access message 3 including an ID (e.g., S-TMSI) used to identify the terminal device 1 monitors the random access message 4 including a collision resolution message. If the collision avoidance ID included in the random access message 4 is equal to the ID used to identify the terminal device 1, the terminal device 1 may consider that collision resolution has been successfully completed and set the value of Temporary C-RNTI in the C-RNTI field. The terminal device 1 whose C-RNTI field is set to the value of Temporary C-RNTI is considered to have completed the RRC connection.

[0221] The terminal device 1 determines whether or not it receives a random access message 4 (collision resolution message) within the contention resolution timer. Note that the measurement of the contention resolution timer is started due to the transmission of the random access message 3. If the terminal device 1 determines that it has not received the random access message 4 within the contention resolution timer, it determines that the random access message 3 has not been received by the base station device 3, and resumes processing from step 5101.

[0222] The terminal device 1 may set a contention resolution timer of a value (length) indicated in the information indicating the configuration of the random access channel.

[0223] In the 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 setting of the transmission power of the random access preamble. That is, the transmission power may be set higher by the value of power ramping. The 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. The terminal device 1 may set the value indicated in the information indicating the configuration of the random access channel to the value of power ramping.

[0224] 6 is a diagram showing an example of a process for transmitting a wake-up signal according to one aspect of the present embodiment. When the terminal device 1 determines that it needs to receive on-demand system information, it adds a value obtained by multiplying the power ramping counter by the power ramping step size to the transmission power value and transmits the wake-up signal (step S201). Note that the terminal device 1 resets the power ramping counter when starting to transmit the wake-up signal.

[0225] Next, the terminal device 1 determines whether a response to the wake-up signal has been received (step S202). Here, the terminal device 1 determines whether a response to the transmitted wake-up signal has been received within the response window time of the wake-up signal from the timing of transmitting the wake-up signal. If the terminal device 1 determines that a response to the wake-up signal has not been received (step S202: NO), it increments the power ramping counter by one (step S203). Then, the terminal device 1 again transmits the wake-up signal (step S201), adding a value obtained by multiplying the power ramping counter by the power ramping step size to the transmission power value. If the terminal device 1 determines that a response to the wake-up signal has been received (step S202: YES), it starts counting on a first timer (a timer that prohibits transmission of a wake-up signal) (step S204).

[0226] Next, the terminal device 1 determines whether or not it has received on-demand system information (On-demand SIB1) (step S205). The terminal device 1 determines whether or not it has received on-demand system information (On-demand SIB1) for each slot or each subframe. If the terminal device determines that it has not received on-demand system information (step S205: NO), it determines whether or not the first timer has expired (step S206). If the terminal device 1 determines that the first timer has not expired (step S206: NO), it again determines whether or not it has received on-demand system information (step S205). If the terminal device 1 determines that the first timer has expired (step S206: YES), it again adds a value obtained by multiplying the power ramping counter by the power ramping step size to the transmission power value and transmits a wake-up signal (step S201). Here, the power ramping counter is not reset, and the terminal device 1 applies power ramping to the transmission of the wake-up signal using the value of the power ramping counter used when the terminal device 1 received the previous response to the wake-up signal. If the terminal device 1 determines that it has received on-demand system information (step S205: YES), it ends the process related to the transmission of the wake-up signal.

[0227] As described above, in this embodiment, when the first timer expires, the terminal device 1 continues to use the amount of power ramping that was applied to the wake-up signal that was previously properly detected by the base station device 3. This allows the retransmitted wake-up signal to be properly detected by the base station device 3, allows the base station device 3 to quickly notify the request for transmission of on-demand system information, and suppresses unnecessary retransmission of the wake-up signal, thereby reducing interference to surrounding areas. As a result, on-demand system information can be transmitted and received efficiently. As a result, network energy consumption can be reduced.

[0228] The programs running on the base station device 3 and terminal device 1 according to this embodiment may be programs (programs that cause a computer to function) that control a CPU (Central Processing Unit) or the like so as to realize the functions of the above-described embodiments according to this embodiment. 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 is read, modified, and written by the CPU as needed.

[0229] Note that the terminal device 1 and part of the base station device 3 in the above-described embodiment may be realized by a computer. In this case, a program for realizing this control function may be recorded on a computer-readable recording medium, and the program recorded on this recording medium may be read into a computer system and executed to realize the control function.

[0230] The "computer system" referred to here is a computer system built into the terminal device 1 or base station device 3, and includes hardware such as the OS and peripheral devices. Also, the "computer-readable recording medium" refers to portable media such as flexible disks, optical magnetic disks, ROMs, CD-ROMs, and storage devices such as hard disks built into the computer system.

[0231] Furthermore, the term "computer-readable recording medium" may include a medium that dynamically stores a program for a short period of time, such as a communication line when transmitting a program via a network such as the Internet or a communication line such as a telephone line, or a medium that stores a program for a certain period of time, such as a volatile memory within a computer system that serves as a server or client in such a case. The program may also be one that realizes part of the above-mentioned functions, or one that can realize the above-mentioned functions in combination with a program already recorded in the computer system.

[0232] The terminal device 1 may comprise at least one processor and at least one memory containing computer program instructions (computer programs). The memory and computer program instructions (computer programs) may be configured to cause the terminal device 1 to perform the operations and processes described in the above embodiments using the processor. The base station device 3 may comprise at least one processor and at least one memory containing computer program instructions (computer programs). The memory and computer program instructions (computer programs) may be configured to cause the base station device 3 to perform the operations and processes described in the above embodiments using the processor.

[0233] Furthermore, the base station device 3 in the above-described embodiment can also be realized as a collection (device group) consisting of multiple devices. Each of the devices constituting the device group may have some or all of the functions or functional blocks of the base station device 3 according to the above-described embodiment. It is sufficient for the device group to have all of the functions or functional blocks of the base station device 3. Furthermore, the terminal device 1 according to the above-described embodiment can also communicate with the base station device as a collection.

[0234] Furthermore, the base station device 3 in the above-described embodiment may be an EUTRAN (Evolved Universal Terrestrial Radio Access Network) and / or an NG-RAN (NextGen RAN, NR RAN). Furthermore, the base station device 3 in the above-described embodiment may have some or all of the functions of an upper node for the eNodeB and / or the gNB.

[0235] Furthermore, some or all of the terminal device 1 and base station device 3 in the above-described embodiments may be realized as an LSI, which is typically an integrated circuit, or as a chipset. Each functional block of the terminal device 1 and base station device 3 may be individually formed into a chip, or some or all of them may be integrated into a chip. Furthermore, the integrated circuit method is not limited to LSI, and may be realized using a dedicated circuit or a general-purpose processor. Furthermore, if an integrated circuit technology that can replace LSI emerges due to advances in semiconductor technology, it is also possible to use an integrated circuit based on that technology.

[0236] Furthermore, in the above-described embodiment, a terminal device is described as an example of a communication device, but the present invention is not limited to this and can also be applied to terminal devices or communication devices such as stationary or non-movable electronic devices installed indoors or outdoors, for example, AV equipment, kitchen equipment, cleaning / washing equipment, air conditioning equipment, office equipment, vending machines, and other household appliances.

[0237] Although the embodiments of the present invention have been described above in detail with reference to the drawings, the specific configuration is not limited to this embodiment, and design modifications and the like are also included within the scope of the gist of the present invention. Furthermore, various modifications of one aspect of the present invention are possible within the scope of the claims, and embodiments obtained by appropriately combining the technical means disclosed in different embodiments are also included in the technical scope of the present invention. Furthermore, configurations in which elements described in the above embodiments are substituted with elements that achieve the same effect are also included.

[0238] One aspect of the present invention can be used, for example, in a communication system, a communication device (e.g., a mobile phone device, a base station device, a wireless LAN device, or a sensor device), an integrated circuit (e.g., a communication chip), or a program.

[0239] 1 (1A, 1B, 1C) Terminal device 3 Base station device 10, 30 Radio transmission / reception unit 11, 31 Antenna unit 12, 32 RF unit 13, 33 Baseband unit 14, 34 Upper layer processing unit 15, 35 Medium access control layer processing unit 16, 36 Radio resource control layer processing unit

Claims

1. A terminal device having a processor and a memory for storing computer program code, the terminal device performing the following operations: transmitting a wake-up signal; if no response to the wake-up signal is detected, retransmitting the wake-up signal with power ramping; if a response to the wake-up signal is detected, starting a first timer; and if the first timer expires, retransmitting the wake-up signal with the latest power ramping amount.

2. The terminal device according to claim 1, wherein the retransmission of the wake-up signal is stopped until the first timer expires.

3. The terminal device according to claim 1, wherein the first timer is reset when on-demand system information is received.

4. A communication method used in a terminal device, comprising the steps of: transmitting a wake-up signal; if no response to the wake-up signal is detected, retransmitting the wake-up signal applying power ramping; if a response to the wake-up signal is detected, starting a first timer; and if the first timer expires, retransmitting the wake-up signal applying the latest amount of power ramping.

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