Terminal and communication method

Abstract

It is possible to efficiently transmit and receive on-demand system information.SOLUTION: When a wake-up signal is transmitted and a response to the wake-up signal is not detected, power ramping is applied to retransmit the wake-up signal, when a response to the wake-up signal is detected, counting of a first timer is started, and when the first timer expires, the latest amount of power ramping is applied to retransmit the wake-up signal.SELECTED DRAWING: Figure 6

Description

[Technical Field]

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

[0002] 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") LTE is being standardized by the 3rd Generation Partnership Project (3GPP). In LTE, base station equipment is also called eNodeB (evolved NodeB), and terminal equipment is also called UE (User Equipment). In a cellular communication system, a plurality of base station devices are arranged in the form of cells to cover an area covered by the base station. 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 a 5G communication method. NR combines eMBB (enhanced Mobile BroadBand), mMTC (massive Machine Type Communication), and URLLC (Ultra Reliable and Low Latency) in a single technology framework. It is required to satisfy the requirements assuming three scenarios:

[0004] 3GPP is studying methods to reduce energy consumption in networks in order to reduce the burden on the environment and to reduce operation costs (Non-Patent Document 1). The majority of energy consumption in a network is consumed in the radio access network. They are studying ways to reduce network energy consumption by shortening the time that base station equipment transmits or receives signals and lengthening the time that base station equipment can enter a sleep state. [Prior art documents] [Non-patent literature]

[0005] [Non-Patent Document 1] "New WID: Enhancements of network energy savings for NR", RP-234065, Ericsson, 3GPP TSG RAN Meeting #102, Edinburgh, Scotland, December 11th-15th, 2023 Summary of the Invention [Problem to be solved by the invention]

[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. [Means for solving the problem]

[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, if on-demand system information is received, the first timer is reset.

[0010] (4) A second aspect of the present invention is a communication method used in a terminal device, comprising the steps of: transmitting a wake-up signal; 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, when on-demand system information is received, the first timer is reset. [Effects of the Invention]

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

[0014] [Figure 1] 1 is a conceptual diagram of a wireless communication system according to an aspect of the present embodiment. [Figure 2] FIG. 2 is a schematic diagram illustrating an example of a resource grid in a subframe according to an aspect of the present embodiment. [Figure 3] 1 is a schematic block diagram showing a configuration of a terminal device 1 according to an aspect of the present embodiment. [Figure 4] FIG. 2 is a schematic block diagram illustrating a configuration of a base station device 3 according to one aspect of the present embodiment. [Figure 5] FIG. 10 is a diagram illustrating an example of an initial connection procedure according to an aspect of the present embodiment. [Figure 6] FIG. 10 is a diagram illustrating an example of a process for transmitting a wake-up signal according to an aspect of the present embodiment. DETAILED DESCRIPTION OF THE INVENTION

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

[0018] Fig. 1 is a conceptual diagram of a wireless communication system according to one aspect of this 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 The base station device 3A and the base station device 3B are also referred to as base station device 3 (gNB). Base station device 3A and base station device 3C use different frequencies. For example, base station device 3A uses low-band frequencies, and base station device 3B and base station device 3C use high-band frequencies. The coverage of base station device 3B is configured within the coverage of base station device 3A. The coverage of base station device 3C is configured within the coverage of base station device 3A. Base station device 3A 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 (called 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, The base station device 3A configures a cell (called a Network Energy Saving Cell: NES Cell) that transmits common signals (such as system information) on demand. The cell configured by base station device 3B and the cell configured by base station device 3C may be called 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] Base station device 3A and base station device 3B are connected by wire or wirelessly and cooperate by exchanging information. Base station device 3B may notify base station device 3A of information related to the configuration of the wake-up signal. Base station device 3A may also notify base station device 3B of information related to the configuration of the wake-up signal.

[0021] Base station device 3A and base station device 3C are connected by wire or wirelessly and cooperate by exchanging information. Base station device 3C may notify base station device 3A of information related to the configuration of the wake-up signal. Base station device 3A may also notify 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 the resource of the wake-up signal. At least one of information about the time resource, information about the frequency resource, and information about the code resource of the wake-up signal is included in the information about the wake-up signal. The information about the wake-up signal includes the cell ID of the corresponding cell, the cell frequency (ARFCN: Absolute radio-frequency channel number), the frequency band of the uplink BWP, and Frequency position, TDD frame structure (uplink and downlink frame structure), transmission power parameters, control resource set / search space, prohibition of wake-up signal transmission It may also include information about timers, etc.

[0024] The wake-up signal may have the same structure as a random access channel signal.

[0025] The base station device 3 is a 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 serving cell identifier (SCI). The serving cell identifier 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 Figure 1, the base station device 3 may be configured with one transceiver device (or transmission point, transmission device, reception point, reception device, transmission / reception point). On the other hand, in some cases, the base station device 3 may be configured to include multiple transceivers devices. When the base station device 3 is configured with multiple transceivers devices, each of the multiple transceivers devices may be located in a different geographical location.

[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 T c =1 / (Δf max ×N f ) may be used to represent the length in the time domain, where Δf max = 480 kHz. f = 4096. The constant κ may be expressed as κ = Δf max ×N f / (Δfref N f,r ef )=64. Also, Δf ref may be 15 kHz. f,re f 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 be configured to include 10 subframes. Here, the length of a subframe may be Tsf = (Δfmax × Nf / 1000) × Ts = 1 ms. Even if the number of OFDM symbols per Nsubframe, μsymb=Nslotsymb×Nsubframe, μslot good.

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

[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 the case of normal CP, In the setting, Nslotsymb=14 may be used. In the setting of the extended CP, Nslotsymb=12 may be used.

[0034] Slots may be indexed in the time domain, e.g., the slot index nμs is an ascending integer value ranging from 0 to Nsubframe,μslot-1 in subframes. The slot index nμs,f may be given in order in a radio frame. It may be given in ascending order as integer values ​​ranging from 0 to Nframe, μslot-1.

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

[0037] A resource block (RB) contains NRBsc consecutive subcarriers. Resource blocks are divided into common resource blocks, physical resource blocks (PRBs), and virtual resource blocks (VRBs). For example, NRBsc=12.

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

[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 an antenna unit 11, an RF (Radio Frequency) unit 12, and The radio transceiver 10 is configured to include at least a part or all of a baseband unit 13 and a medium access control layer processing unit 15 and a part or all of a radio resource control layer processing unit 16. The radio transceiver 10 is also referred to as a transmitter, a receiver, or a physical layer processing unit.

[0041] The wireless transceiver 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 the downlink physical channel. The port block may be delivered to higher layers on the DL-SCH. For example, the radio transceiver 10 may attempt to detect information conveyed by a downlink physical signal.

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

[0045] The receiving unit (receiving processing unit) of the terminal device 1 receives the PDSCH. Receiving PDSCH in the relink 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 receiver of the terminal device 1 receives the system information via the PDSCH. 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 demand system information is output to the upper layer processing unit 14. The receiving unit of the terminal device 1 receives the PDSCH. The receiving unit of the terminal device 1 receives information about the wake-up signal via the base station device 3. The receiving unit of the terminal device 1 may receive information about the wake-up signal included in the system information. The receiving unit of the terminal device 1 receives signals from a plurality of base station devices 3. The receiving unit of the terminal device 1 receives signals from a plurality of 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. The resource of the wake-up signal includes time resource (radio frame, subframe, OFDM symbol) (period, offset, section), frequency resource (BWP, link), etc. This means at least one of the following: source blocks (start position, number), and code resources (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 resource of each wakeup signal is associated with information identifying the corresponding cell, such as a cell ID. For example, the terminal device 1 selects either one of the cells corresponding to WakeUp signal configuration #1 and the cells 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 the cell corresponding to WakeUp signal configuration #1 and the 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. A response to a wake-up signal may be received via the PDSCH. The response to the wake-up signal may be a MAC CE. The response to the wake-up signal may be a PDCCH including a DCI format scrambled with a specific RNTI. The receiving unit of the terminal device 1 After transmitting the wake-up signal, only a specific time window may be monitored for a response to 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] The transmission unit (also referred to as a transmission processing unit) of the terminal device 1 transmits a HARQ-ACK. The transmission processing unit of the terminal device 1 transmits a HARQ-ACK for a PDSCH. HARQ-ACK is transmitted in the link frequency band (cell, component carrier, carrier).

[0053] A transmission unit of the terminal device 1 transmits a random access preamble. A transmission unit of the terminal device 1 transmits the random access preamble using a preamble format. A 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 the RACH occasion. The transmission unit of the terminal device 1 transmits the RACH at the RACH occasion set in the terminal device 1. A RACH occasion is selected from one or more RACH occasions corresponding to the SSB selected by the signal section. , and transmits a RACH (random access preamble) on the selected RACH occasion.

[0054] The transmission unit of the terminal device 1 retransmits the random access preamble. The transmission unit of the terminal device 1 retransmits the random access preamble on a plurality of RACH occasions. The transmitting unit of the terminal device 1 may retransmit the random access preamble up to a set maximum number (the 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 transmitting unit of the terminal device 1 transmits a wake-up signal. The transmitting unit of the terminal device 1 transmits the wake-up signal in a first cell. The transmitting unit of the terminal device 1 may transmit a random access preamble as the wake-up signal. The transmitting unit 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 transmitting unit of the terminal device 1 may transmit the random access preamble using a PRACH set as a resource for the wake-up signal. The transmission unit of the terminal device 1 receives the RACH occasion set as a resource for the wake-up signal. The transmission unit of the terminal device 1 may transmit a wake-up signal by selecting one or more RACH occasions set as resources for the wake-up signal by the reception unit of the terminal device 1. Select a RACH occasion from one or more RACH occasions corresponding to the selected SSB, and The wake-up signal may be transmitted on the selected RACH occasion.

[0056] The transmitting unit of the terminal device 1 retransmits the wake-up signal. The transmitting unit of the terminal device 1 retransmits the random access preamble set as a resource for the wake-up signal. If the transmitting unit of the terminal device 1 does not detect a response to the transmitted wake-up signal, the transmitting unit of the terminal device 1 retransmits the wake-up signal. The transmitting unit of the terminal device 1 retransmits the random access preamble set as a resource for the wake-up signal in 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 the set maximum number of times.

[0057] The transmitting unit of the terminal device 1 performs power ramping when retransmitting a random access preamble using a power ramping value set as a resource for the wake-up signal. The transmitting unit of the terminal device 1 measures a counter (first counter) related to power ramping. When the transmitting unit 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 transmitting unit increments the counter related to power ramping by one. The transmitting unit 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, one of the values ​​(sizes) of 2 dB, 4 dB, or 6 dB is set as the first step. The transmitter of the terminal device 1 increases the transmission power by the amount of 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 about 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 starts retransmitting the wake-up signal again. The transmitting unit of the terminal device 1 retransmits the wake-up signal by applying the latest 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 it to determine the transmission power of the wake-up signal to be retransmitted.

[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 transmitting unit of the terminal device 1 may further increase the amount of power ramping and retransmit the wake-up signal. The transmitting unit 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, which may result in the base station device 3 being unable 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 transmitting unit of the terminal device 1 selects a wake-up signal that can be transmitted. The terminal device 1 may select a cell to transmit a wake-up signal from among one or more cells whose reception quality is equal to or higher than a certain threshold.

[0062] The transmitting unit of the terminal device 1 transmits signals to the plurality of base station devices 3. The transmitting unit 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 block) generated by user operation or the like to the radio transmitting and receiving unit 10. The upper layer processing unit 14 processes data from the MAC layer, packet Packet Data Convergence Protocol (PDCP) layer, wireless link It processes the control (RLC: Radio Link Control) layer and the RRC layer.

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

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

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

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

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

[0069] The radio resource control layer processing unit 16 transmits the RRC signaling (system information) to the The information indicating the configuration of the wake-up signal is received. The information indicating the configuration of the wake-up signal includes information indicating the resource of the wake-up signal. The information indicating the configuration of the wake-up signal includes information indicating the value of a first timer (a value set when the timer starts timing), which is a timer that prohibits transmission of the wake-up signal. 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 a 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 a first timer, etc.) for the transmitting unit of the terminal device 1. When transmitting a wake-up signal, the transmitting 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 processes the RRC signaling (system The RACH preamble format (PRACH preamble format) used in the uplink slot is set based on the RACH preamble format (PRACH preamble format). Either a short preamble format or a long preamble format is set as the RACH preamble format (PRACH preamble format).

[0072] The long preamble format is a RACH preamble format (PRACH preamble format) with a signal configuration of multiple slots. The short preamble format is a RACH preamble format with a signal configuration of a single slot. preamble format (PRACH preamble format). For example, the Long preamble format is In NR, 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, Format 3 is.

[0073] The medium access control layer processing unit (MAC layer processing unit) 15 performs HARQ operation, MAC CE resolution, and It performs MAC layer processing such as processing based on the reading and decoding results.

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

[0075] The wireless transmission / reception unit 10 performs modulation, coding, and transmission processing. The wireless transmission / reception unit 10 generates a physical signal by coding processing, modulation processing, and baseband signal generation processing (conversion to a time-continuous signal) on data (transport blocks), 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 extracts a CP (Cyclic Prefix) from the converted digital signal. The baseband unit 13 performs a fast Fourier transform (FFT) on the signal from which the CP has been removed, and extracts a signal in the frequency domain.

[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 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 up-converts the analog signal to a carrier frequency. The RF unit 12 converts the RF signal to generate an RF signal. The RF unit 12 transmits the RF signal via the antenna unit 11. The RF unit 12 also amplifies the power. The RF unit 12 may also have a function to control the transmission power. The RF unit 12 is also referred to as a transmission power control unit.

[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 this embodiment. As shown in the figure, the base station device 3 includes a radio transmission / reception unit 30 and a higher layer processing unit 34. The radio transmission / reception unit 30 includes an antenna unit 31, an RF (Radio Frequency) unit 32, and a baseband unit 33. The higher layer processing unit 34 , a medium access control layer processing unit 35, and a radio resource control layer processing unit 36. The radio transceiver unit 30 is also referred to as a transmitter, a receiver, or a physical layer processing unit.

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

[0084] The medium access control layer processing unit 35 included in the upper layer processing unit 34 performs MAC layer processing. Here, the MAC layer processing involves mapping between logical channels and transport channels, Or multiplexing multiple MAC SDUs (Service Data Units) into a transport block, or decomposing a transport block delivered from the physical layer on UL-SCH into one or multiple MAC SDUs. ,Application of HARQ (Hybrid Automatic Repeat reQuest) to transport blocks, and may include some or all of the processing of scheduling requests.

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

[0087] The radio resource control layer processing unit 36 ​​receives the RRC message transmitted from the terminal device 1. The RRC parameters to be transmitted to the terminal device 1 may be determined based on the RRC parameters. Here, the RRC message transmitted from the terminal device 1 is related to the capability information report of the terminal device 1. That's fine.

[0088] The radio resource control layer processing unit 36 ​​sets a control resource set for the terminal device 1. A plurality of 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. Determine.

[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 in the transmission processing unit.

[0090] The radio resource control layer processing unit 36 ​​performs settings related to a plurality of search spaces, 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 uplink resource control layer processing unit 36 ​​allocates resources for transmitting HARQ-ACK for PDSCH to the uplink. link frequency band (cell, component carrier, carrier).

[0092] The radio resource control layer processing unit 36 ​​sets the RACH occasion. The management unit 36 ​​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 the resources of the wake-up signal. The radio resource control layer processing unit 36 ​​may set the maximum number of times the wake-up signal is transmitted. Radio Resource The 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 HARQ operation, MAC CE generation, and It performs MAC layer processing such as configuration.

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

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

[0099] The radio transmission / reception unit 30 grasps the SS (Search space) configured in the terminal device 1. The radio transmission / reception unit 30 grasps the search space in the control resource set configured in the terminal device 1. The radio transmission / reception unit 30 grasps PDCCH candidates monitored in the terminal device 1, The radio transmission / reception unit 30 grasps the search area for each PDCCH candidate monitored in the terminal device 1. It is determined which control channel elements the PDCCH candidate is made up of (the PDCCH candidate is made up of The radio transceiver 30 includes an SS determining unit, which determines the SS configured in the terminal device 1. The SS determining unit determines one or more PDCCH candidates in the control resource set configured as the search space of the terminal device. SS determining unit grasps the PDCCH candidates (the number of PDCCH candidates, the numbers of the PDCCH candidates) configured in the search area of ​​the control resource set of the terminal device 1.

[0100] The SS ascertainer 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). (Transmission processing unit) transmits PDCCH candidates within the search area of ​​the control resource set to the terminal device 1. The PDCCH is transmitted using the

[0101] The transmitter (also referred to as a transmission processor) of the base station device 3 transmits the PDCCH. The transmission processing unit of the base station device 3 transmits the PDCCH using PDCCH candidates monitored in the terminal device 1. The transmission processing unit of the base station device 3 transmits the PDCCH using resources corresponding to PDCCH candidates in a search area set for the terminal device 1. The transmission processing unit of the base station device 3 transmits the PDCCH using resources corresponding to PDCCH candidates in a search area set for the terminal device 1. The PDCCH is transmitted using the PDCCH candidates in the search area where the matching is performed.

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

[0103] The receiving unit of the base station device 3 receives the RACH. The receiving unit of the base station device 3 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 the 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. Radio resource control layer processing unit 36 Alternatively, the terminal device 1 may set a value of a random access response window and transmit an RRC parameter related to the set value of the random access response window to the terminal device 1. The source control layer processing unit 36 ​​sets the value of the contention resolution timer and transmits the RRC parameters related to the set contention resolution timer value to the terminal device. The radio resource control layer processing unit 36 ​​may set a power ramping value and transmit RRC parameters related to the set power ramping value to the terminal device 1. The radio resource control layer processing unit 36 ​​sets the initial random access preamble power value and sets the RRC parameters related to the set initial random access preamble power value. The radio resource control layer processing unit 36 ​​may set the total number of random access preambles for contention-based random access, and may transmit the RRC parameter related to the set total number of random access preambles for contention-based random access. 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 the RRC parameter related to the set number of random access channels to be frequency-multiplexed in one time instance to the terminal device 1. The parameters may be transmitted to the terminal device 1.

[0105] The receiving unit of the base station device 3 receives a 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 the resource for the wake-up signal and The radio resource control layer processing unit 36 ​​transmits RRC parameters related to 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 the random access preamble as a 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 3 may set a RACH occasion as a resource for the wake-up signal and transmit RRC parameters related to the set RACH occasion to the terminal device 1. 6 sets the maximum number of transmissions of the random access preamble as a wake-up signal resource, and the RRC parameter for the set maximum number of transmissions of the random access preamble is 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 line resource control layer processing unit 36 ​​may set a power ramping value of the wake-up signal and transmit to the terminal device 1 an RRC parameter related to the set power ramping value of the wake-up signal (power ramping step size).

[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 CP (Cyclic Prefix) from the digitized baseband signal. Alternatively, a fast Fourier transform (FFT) may be performed on the subband signal to extract a frequency domain signal.

[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] Hereinafter, physical channels and physical signals according to various aspects of the present embodiment will be described. 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 is a set of resource elements carrying information generated by higher layers. The uplink physical channels may correspond to a set. The uplink physical channels are physical channels used in the uplink component carriers. The uplink physical channels may be transmitted by the radio transceiver unit 10. The uplink physical channels may be received by the radio transceiver unit 30. In a radio 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 transmits (transmits) uplink control information (UCI). The uplink control information may be placed in the PUCCH. The wireless transmission and reception unit 10 may transmit a PUCCH in which uplink control information is arranged. The receiving unit 30 may receive a PUCCH in which uplink control information is arranged.

[0115] Uplink control information (uplink control information bit, uplink control information sequence, uplink control information type) is used in combination with channel state information (CSI), schedule Scheduling Request (SR), HARQ-ACK (Hybrid Automatic Repeat The uplink control information may include some or all of the request ACKnowledgement (ACK) information. Note that the uplink control information may also include information not described above.

[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. An ACK may indicate that the transport block has been decoded successfully. A NACK may indicate that the transport block has not been decoded successfully. The HARQ-ACK information may include one or more HARQ-ACK bits.

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

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

[0120] The channel state information is a channel quality indicator (CQI), a pre-conditioning The CQI may include some or all of a Precoder Matrix Indicator (PMI) and a Rank Indicator (RI). Alternatively, it is an index related to the quality of the physical channel, and PMI is an index related to the precoder. The RI is an index 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 carries uplink control information and / or transport blocks. The PUSCH may be transmitted to convey uplink control information and transport information. The PUSCH may be used to carry one or both of the transport blocks. The PUSCH may be used to transmit at least some or all of the port blocks, HARQ-ACKs, channel state information, and scheduling requests. The PUSCH is used at least to transmit access message 3. The terminal device 1 may transmit uplink control information and / or a PUSCH in which a transport block is allocated. The station device 3 may receive a PUSCH in which either or both of the uplink control information and the transport block are arranged.

[0124] PRACH is the index of the random access preamble (random access message The terminal device 1 may transmit the PRACH. The base station device 3 may receive the PRACH. The terminal device 1 may transmit a random access preamble on the PRACH. The base station device 3 may transmit a random access preamble on the PRACH. may be received.

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

[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 a physical layer. The uplink physical signal may be a physical signal used in an uplink component carrier. The radio transceiver unit 10 may transmit the uplink physical signal. The radio transceiver unit 30 may receive the uplink physical signal. In the uplink of the wireless communication system according to one aspect of the present embodiment, some or all of the following uplink physical signals may be used. ·UL DMRS(UpLink Demodulation Reference Signal) ·SRS(Sounding Reference Signal) ·UL PTRS(UpLink Phase Tracking Reference Signal) Wake-Up Signal

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

[0128] The set of antenna ports for DMRS for PUSCH (DMRS related to PUSCH, DMRS included in PUSCH, DMRS corresponding to PUSCH) is given based on the set of antenna ports for the PUSCH. For example, for PUSCH The set of antenna ports for the DMRS is the same as the set of antenna ports for the PUSCH. Good too.

[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. stomach.

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

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

[0135] PDCCH is used to transmit (transmit) downlink control information (DCI). The downlink control information may be placed in the PDCCH. The terminal device 1 may receive the PDCCH in which the downlink control information is arranged. Alternatively, a PDCCH in which downlink control information is allocated may be transmitted.

[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 be It may also be interpreted as a set of downlink control information set in a certain downlink control information format.

[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 notify the terminal device 1 of downlink control information using a PDCCH with a DCI format. The terminal device 1 may transmit the downlink control information included in the detected DCI format to the terminal device 1. In addition, the terminal device 1 may control the radio transmission / reception unit 10 using the downlink control information included in the detected DCI format. It may be controlled.

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

[0139] DCI format 0_0, DCI format 0_1, DCI format 1_0, and DCI format DCI formats such as DCI format 0_0 and DCI format 0_1 ​​are used. 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 and DCI format 1_1, etc.

[0140] DCI format 0_0 is used for scheduling PUSCH allocated to a certain cell. DCI format 0_1 ​​is used for scheduling PUSCHs allocated to a cell. DCI format 1_0 is used for scheduling PDSCHs allocated to a cell. DCI format 1_1 is used for scheduling PDSCHs allocated to a cell. Used for rings.

[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. Mat 2_9 is composed of some or all of the following information: Block number Cell DTX / DRX indication

[0142] Whether the DCI format is an uplink DCI format or a downlink DCI format A DCI format identifier field (Identifier for DCI formats field) indicating whether the DCI format is a A time domain resource assignment field indicating time domain resource assignment may be included in the DCI format. A frequency hopping flag field indicating whether frequency hopping is applied may be included in the DCI format. Channel modulation The DCI format may include an MCS field (Modulation and Coding Scheme field) indicating one or both of the modulation scheme and the target coding rate. The DCI format may include a CSI request field indicating an instruction for reporting CSI. A BWP field indicating the BWP to which the channel is assigned may be included in the DCI format. A PDSCH to HARQ feedback timing indicator field indicating the timing at which the HARQ-ACK is transmitted may be included in the DCI format. A PUCCH resource indicator field indicating a 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 one PDSCH in one serving cell. The downlink grant is at least used for scheduling the PDSCH in the same slot as the slot in which the downlink grant is transmitted. The downlink grant may be used for scheduling the PDSCH in a slot different from the slot in which the downlink grant is transmitted. It is used for scheduling at least one PUSCH in the serving cell.

[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 receives the PDSCH in which the transport block is allocated. Good too.

[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 wireless communication system according to one aspect of the present embodiment, at least some or all of the following downlink physical signals may be used. ·Synchronization signal (SS) ·DL DMRS(DownLink DeModulation Reference Signal) ·CSI-RS(Channel State Information-Reference Signal) ·DL PTRS(DownLink Phase Tracking Reference Signal)

[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 includes a PSS (Primary Synchronization Signal) and and SSS (Secondary Synchronization Signal).

[0147] The SS block (SS / PBCH block) contains at least some or all of the PSS, SSS, and PBCH. It is composed of at least

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

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

[0150] DL DMRS is the sum of DMRS for PBCH, DMRS for PDSCH, and DMRS for PDCCH. It is a title.

[0151] The set of antenna ports for DMRS for PDSCH (DMRS related to PDSCH, DMRS included in PDSCH, DMRS corresponding to PDSCH) is given based on the set of antenna ports for the PDSCH. For example, the set of antenna ports for a DMRS for a PDSCH may be the same as the set of antenna ports for the PDSCH.

[0152] The propagation path of a PDSCH may be estimated from the DMRS for that PDSCH. A set of resource elements on which a DMRS symbol is transmitted and the DMRS symbol for the PDSCH are transmitted. When a set of resource elements on which symbols of a PDSCH are transmitted is included in the same precoding resource group (PRG), the PDSCH on which the symbols of the PDSCH are transmitted for an antenna port may be estimated by the DMRS for the PDSCH.

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

[0155] The BCH (Broadcast CHannel), the UL-SCH (Uplink-Shared CHannel), and the 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. The transport blocks delivered from higher layers on the BCH of the transport layer are mapped to the PBCH of the physical layer. The UL-SCH of the transport layer may also be mapped to the PUSCH of the physical layer. stomach.

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

[0158] BCCH (Broadcast Control CHannel), CCCH (Common Control CHannel), and DCCH (Dedicated Control CHannel) are logical channels. For example, BCCH uses MIB. The CCCH may be used to deliver an RRC message including RRC parameters common to multiple terminal devices 1, 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 to deliver an RRC message including RRC parameters common to multiple terminal devices 1, for example. The DCCH may also be used for RRC messages dedicated to a certain terminal device 1. Here, the DCCH may be used to transmit messages, for example, when an RRC connection is established. It may also be used for the terminal device 1.

[0159] The BCCH may be mapped to the BCH or DL-SCH. RRC messages containing system information other than MIB may be delivered on the BCH. In addition, CCCH is mapped to either DL-SCH or UL-SCH. In other words, RRC messages mapped to CCCH may be delivered on either DL-SCH or UL-SCH. In addition, the DCCH may be mapped to either the DL-SCH or the UL-SCH, i.e., an RRC message mapped to the DCCH may be delivered on either the DL-SCH or the UL-SCH.

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

[0161] The media access control layer processing unit 15 may perform a random access procedure. The media access control layer processing unit 15 selects a RACH occasion for transmitting a random access preamble. You may do so.

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

[0164] One or more control resource sets (CORESET: Control Resource SET) may be configured in the terminal device 1. The terminal device 1 may transmit a PDCCH in one or more control resource sets. Here, monitoring the PDCCH in one or more control resource sets may include monitoring one or more PDCCHs corresponding to each of the one or more control resource sets. Note that the PDCCH may include one or more PDCCH candidates and The PDCCH monitoring may also include a set of PDCCH and / or PDCCH candidates. and / or monitoring and detecting the DCI format transmitted via the PDCCH.

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

[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 be determined by the number of CCEs constituting the PDCCH. The PDDCH 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. 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 performs blind search for PDCCH candidates included in a search space in a control resource set. By transmitting the PDCCH and / or DCI for the terminal device 1, it is possible to detect the PDCCH and / or DCI for the terminal device 1.

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

[0173] HARQ-ACK is also known as ACK / NACK, HARQ feedback, HARQ-ACK feedback, HARQ response, HARQ-ACK response, HARQ information, HARQ-ACK information, HARQ control information, and HARQ-ACK control information. It may also be called.

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

[0175] HARQ control for one transport block may be called an HARQ process. One HARQ process identifier may be assigned to each HARQ process. It includes a field indicating a process identifier (HARQ process number).

[0176] An NDI (New Data Indicator) is indicated in a DCI format for each HARQ process. For example, an NDI field is included in a DCI format (DL assignment) that includes 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 detects the NDI field of the 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 receives the HARQ process identifier field of the detected DCI format. For the HARQ process corresponding to the value, the stored NDI value is updated using the NDI field of the detected DCI format.

[0177] The terminal device 1 receives the data based on the value of the NDI field in the DCI format (DL assignment). The terminal device 1 determines whether the received transport block is a new transmission or a retransmission. ... When the base station device 3 transmits a transport block for new transmission in a certain HARQ process, it toggles the value of the NDI stored for that HARQ process and transmits the toggled NDI to the terminal device 1. When the base station device 3 transmits a transport block for retransmission in a certain HARQ process, it does not toggle the value of the NDI stored for that HARQ process and transmits an untoggled NDI to the terminal device 1. When the base station device 3 transmits a transport block for retransmission in a certain HARQ process, it does not toggle the value of the NDI stored for that HARQ process and transmits an untoggled NDI to the terminal device 1. When the base station device 3 compares the value of the NDI field of the detected DCI format with the value of the NDI previously received for a transport block of a certain HARQ process, it determines that the received transport block is a newly transmitted one. If it has not been toggled (if it is the same), it is determined that the received transport block is a retransmission. Note that toggling here means switching to a different value.

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

[0179] The terminal device 1 may report HARQ-ACK information for PDSCH reception in slot n by transmitting a PUCCH and / or a PUSCH in slot n+k, where k is the number of PDSCHs for the PDSCH reception. of the slot indicated by the HARQ indication field included in the corresponding DCI format. Alternatively, if the HARQ indication field is not included in the DCI format, k may be given by a higher layer parameter.

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

[0181] The higher layer signaling may be common RRC signaling. The RRC signaling has at least some or all of the following features C1 to C3: That's fine. Feature C1) Mapped to BCCH logical channel or CCCH logical channel Feature C2) Includes at least the radioResourceConfigCommon information element Feature C3) Mapped to 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 setting (configuration) of the RACH 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. A plurality of PRACH Configurations are configured in advance, and each PRACH Configuration is assigned an index called a PRACH Configuration Index. The RACH occasion is indicated by information indicating the subframe number in which the RACH is arranged. Note that the PRACH configuration may indicate the RACH occasion for 10 subframes, and the RACH occasion may be repeated every 10 subframes. For example, For example, the period of the RACH occasion is indicated by the number of subframes, and can be 1, 2, 4, 8, For example, the period of the RACH occasion may be the number of slots. , and may be 1, 2, 4, 8, 16, or 32. The period of the occasion depends on the position of the subframe in which the RACH is placed and the slot within the subframe. The location of the target may be indicated.

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

[0185] The information indicating the RACH configuration may include information indicating the maximum number of retransmissions of the random access preamble. More specifically, this is 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 configuration (structure) of the RACH may include information indicating the number of random access preambles used for contention-based random access and contention-free random access. For example, any one of 1 to 63 may be indicated as the number of random access preambles used for contention-based random access and contention-free random access. Each piece of information indicating the configuration (structure) of the RACH may independently include information indicating the number of random access preambles used for contention-based random access. For example, any one of 1 to 63 may be indicated as the number of random access preambles used for contention-based random access.

[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 following may be indicated: 1, 2, 4, 8, 10, 20, 40, or 80 slots.

[0189] The information indicating the setting (configuration) of the RACH indicates the power ramping step for the PRACH. For example, power ramping steps may be 0 dB, 2 dB, 4 dB, 6 dB, Either dB may be shown.

[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. The number of frequency-multiplexed PRACH transmission intervals is indicated as 1, 2, 4, or 8. That's fine.

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

[0192] The information indicating the RACH setting (configuration) may include information indicating the value of the initial random access preamble power (target power level at the network receiver side). For example, the value of the initial random access preamble power may be indicated as 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 the occasion (WakeUp occasion) in which the wakeup signal resource is configured. The WakeUp occasion includes information indicating the start position of the symbol in which the wakeup signal is placed within the Slot, information indicating the Subframe number in which the wakeup signal is placed, information indicating the Subframe number in which the wakeup signal is placed, The information may include information indicating the period of a frame or information indicating the period of a slot in which a wake-up signal is placed. For example, the period of the wake-up occasion may be determined based on the number of subframes. For example, the period of the WakeUp occasion is represented by the number of slots, and may be represented as 1, 2, 4, 8, 16, or 3. The period of the WakeUp occasion is the period when the wakeup signal is distributed. The position of the subframe in which the signal is placed and the position of the slot within the subframe may be indicated.

[0195] The information indicating the setting (configuration) of the wake-up signal may include information indicating the number of wake-up occasions for each SSB. For example, each SSB may correspond to eight wake-up occasions, four wake-up occasions, two wake-up occasions, or one wake-up occasion. For example, one WakeUp occasion may correspond to every two SSBs. For example, one WakeUp occasion may correspond to every four SSBs. For example, one WakeUp occasion may correspond to every eight SSBs. For example, one WakeUp 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 wake-up signal configuration 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 the value of the initial wake-up signal power (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 signaling may be dedicated RRC signaling. The dedicated RRC signaling has at least some or all of the following characteristics D1 to D2: Good too. Feature D1) Mapped to DCCH logical channel Feature D2) At least the radioResourceConfigDedicated information element is included

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

[0203] For example, the MIB, the first system information, and the second system information are common RRC signaling. Also, a message from an upper layer that is mapped to a DCCH logical channel and includes at least radioResourceConfigCommon may be included in common RRC signaling. Also, a message from an upper layer that is mapped to a DCCH logical channel and includes at least radioResourceConfigCommon information may be included in common RRC signaling. Higher layer messages that do not contain information elements may be included in dedicated RRC signaling. , a higher layer message that is mapped to the DCCH logical channel and that includes at least the radioResourceConfigDedicated information element may be included in the 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 setting up an initial connection, and 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 the reception of the PDCCH may include information related to an ID indicating a destination of the PDCCH. The ID indicating a destination of the PDCCH may be used for scrambling the CRC bits added to the PDCCH. The ID indicating the destination of the PDCCH may be an ID used in the scrambling of the CRC bits added to the PDCCH. The terminal device 1 may attempt to receive the PDCCH based at least on the information related to the ID included in the PBCH. can.

[0207] The RNTI may include a C-RNTI (Common-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 to schedule a PDSCH including data mapped to a CCCH in a logical channel. The RA-RNTI is used at least for random access message 2. It is used at least for scheduling.

[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 contains parameters used for initial access. The PDSCH may be used at least to transmit / receive system information including data. , may be used at least to send / receive random access messages 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 for 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 the ID (cell ID) of the target cell. The synchronization signal may be transmitted including a sequence generated based at least on the cell ID. The inclusion of the synchronization signal sequence may be based on the cell ID. The synchronization signal may be applied to a beam and transmitted.

[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 an 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 receives the RACH occasion indicated by the information indicating the configuration of the random access channel. The terminal device 1 randomly selects one random access preamble from among a plurality of 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 sends a response to the random access message 1 to the terminal device 1. The response is also called a random access message 2. The random access message 2 may be transmitted via a PDSCH. The PDSCH including the access message 2 is scheduled by the PDCCH. The included CRC bits 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 called a random access response grant. The special uplink grant may be included in the PDSCH that includes the random access message 2. The access response grant may include at least the Temporary C-RNTI.

[0216] The terminal device 1 determines whether it receives a 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 it has not detected the random access message 1 (random access preamble) 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 the information indicating the configuration of the random access channel.

[0218] Step 5103 is a step in which the terminal device 1 sends an RRC connection request to the target cell. The RRC connection request is also called a random access message 3. The random access message 3 may be transmitted via a PUSCH scheduled by a random access response grant. The message 3 may include an ID used to identify the terminal device 1. The ID may be an ID managed in 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] In step 5104, the base station device 3 sends a collision resolution message (Cont The collision resolution message is a step to send a collision resolution message. The random access message 3 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 that includes 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 with the value of Temporary C-RNTI set in the C-RNTI field 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 at the base station device 3, and resumes processing from step 5101.

[0222] The terminal device 1 may set a contention resolution timer with a value (length) indicated by 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. In other words, 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 as 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 as 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 is necessary to receive on-demand system information, it adds a value obtained by multiplying the power ramping counter by the size of the power ramping step to the value of transmission power and transmits a 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 or not a response to the wake-up signal has been received (step S202). Here, the terminal device 1 determines whether or not 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 counts up the power ramping counter. (Step S203). Then, the terminal device 1 again adds a value obtained by multiplying the power ramping counter by the size of the power ramping step to the value of the transmission power and transmits a wake-up signal (Step S201). When the terminal device 1 determines that it has received a response to the wake-up signal (Step S202: YES), it increments the first timer ( A timer that prohibits transmission of a wake-up signal starts counting (step S204).

[0226] Next, the terminal device 1 determines whether or not on-demand system information (On-demand SIB1) has been received (step S205). The terminal device 1 determines whether or not on-demand system information (On-demand SIB1) has been received for each slot or each subframe. If the terminal device determines that on-demand system information has not been received (step S205: NO), The terminal device 1 determines whether the first timer has expired (step S206). If the terminal device 1 determines that the first timer has not expired (step S206: NO), the terminal device 1 starts an on-demand system again. The terminal device 1 determines whether or not it has received system information (step S205). If it 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 power ramping counter value used when it received a response to the previous wake-up signal. If it 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 base station device 3 and the program operating in the terminal device 1 according to this embodiment are implemented by a CPU (Central Processing Unit) so as to realize the functions of the above-described embodiment according to this embodiment. The information handled by these devices is temporarily stored in RAM (Random Access Memory) during processing, and then stored in various ROs such as Flash ROM (Read Only Memory). The data is stored in the MCU or HDD (Hard Disk Drive), and is read and modified by the CPU as needed. Correct writing is performed.

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

[0231] Furthermore, the term "computer-readable recording medium" may also 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 inside a computer system that serves as a server or client in such a case. Furthermore, the above program may be one that realizes part of the above-mentioned functions. Furthermore, the above-described functions may be realized in combination with a program already recorded in a 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 is an EUTRAN (Evolved Universal Terrestrial Radio Access Network) and / or an NG-RAN (NextGen RAN, NR RAN). In addition, the base station device 3 in the above-described embodiment may be configured to It may have some or all of the functions of its higher-level node.

[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 may be realized as a chipset. Each functional block of the terminal device 1 and the base station device 3 may be individually formed into a chip, or some or all of them may be integrated into a chip. The integrated circuit method is not limited to LSI, and may be realized by 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 may also be 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 in detail above with reference to the drawings, the specific configuration is not limited to this embodiment and includes design modifications within the scope of the invention. Furthermore, the present invention is susceptible to various modifications within the scope of the claims, and embodiments obtained by appropriately combining the technical means disclosed in different embodiments are also included in the technical scope of the present invention. Furthermore, configurations in which elements described in the above embodiments are substituted with elements that achieve the same effect are also included. [Explanation of symbols]

[0238] 1(1A, 1B, 1C) Terminal equipment 3 Base station equipment 10, 30 Radio transmitter / receiver 11, 31 Antenna section 12, 32 RF section 13, 33 Baseband section 14, 34 Upper layer processing unit 15, 35 Medium access control layer processing unit 16, 36 Radio resource control layer processing unit

Claims

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

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 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.

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