Terminal and communication method

Abstract

To allow a terminal to perform communications using additional PRACH resources of a BWP.SOLUTION: A terminal includes a receiving unit that receives information including parameters of additional PRACH (Physical random access channel) resources from a base station, and a control unit that sets the received parameters of the additional PRACH resources in the terminal.SELECTED DRAWING: Figure 4

Description

[Technical Field]

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

[0002] For NR (New Radio) (also known as "5G"), the successor system to LTE (Long Term Evolution), technologies that satisfy requirements such as a large-capacity system, high-speed data transmission speed, low latency, simultaneous connection of a large number of terminals, low cost, and low power consumption are being considered (for example, Non-Patent Document 1).

[0003] Furthermore, in Release 18 of 3GPP (registered trademark), network energy savings (NES) has become increasingly important in order to achieve environmental sustainability, carbon neutrality, SDGs (Sustainable Development Goals), reduction of operational costs, etc., and methods for saving power are being considered (for example, Non-Patent Document 2). To realize NES, the setting of an additional dynamically adaptable physical random access channel (PRACH) is required. [Prior art documents] [Non-patent literature]

[0004] [Non-Patent Document 1] 3GPP TS 38.300 V18.4.0 (2024-12) [Non-patent document 2] "New WID: Network energy savings for NR", RP-223540, 3GPP TSG RAN Meeting #98-e, December 2022 [Non-patent document 3] 3GPP TS 38.211 V18.5.0 (2024-12) [Non-patent document 4] 3GPP TS 38.331 V18.4.0 (2024-12) Summary of the Invention [Problem to be solved by the invention]

[0005] However, it is not clear how to configure the additional PRACH resource of the BWP (Bandwidth Part) in the terminal or how to control the activation or deactivation of the additional PRACH resource of the BWP, so that the terminal may not be able to perform communication using the additional PRACH resource of the BWP. [Means for solving the problem]

[0006] The terminal in this embodiment includes a receiving unit that receives information including parameters of additional PRACH resources from a base station, and a control unit that sets the received parameters of the additional PRACH resources in the terminal. [Effects of the Invention]

[0007] According to this embodiment, the terminal can perform communication using additional PRACH resources of the BWP. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a diagram illustrating a wireless communication system according to an embodiment of the present invention. [Figure 2] 10A to 10C are diagrams illustrating an example of an operation related to BWP switching in this embodiment. [Figure 3] FIG. 10 is a sequence diagram showing an example of an operation of the wireless communication system in Example 1-1. [Figure 4] FIG. 10 is a sequence diagram showing an example of an operation of the wireless communication system in Example 1-2. [Figure 5] 10 is a flowchart showing an example of the operation of the terminal in Example 1-3. [Figure 6]10 is a flowchart showing an example of the operation of a terminal in Example 1-4. [Figure 7] FIG. 10 is a sequence diagram illustrating an example of an operation of the wireless communication system according to the second embodiment. [Figure 8] FIG. 2 is a diagram illustrating an example of a functional configuration of a base station according to an embodiment of the present invention. [Figure 9] FIG. 2 is a diagram illustrating an example of a functional configuration of a terminal according to an embodiment of the present invention. [Figure 10] FIG. 2 is a diagram illustrating an example of a hardware configuration of a base station or a terminal according to an embodiment of the present invention. [Figure 11] 1 is a diagram showing an example of a configuration of a vehicle according to an embodiment of the present invention; DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Note that the embodiment described below is an example, and the embodiment to which the present invention is applied is not limited to the following embodiment.

[0010] In operation of the wireless communication system according to the embodiment of the present invention, existing technologies may be used as appropriate. The existing technologies include, but are not limited to, existing NR or LTE. Furthermore, the term "LTE" used in this specification has a broad meaning including LTE-Advanced and systems subsequent to LTE-Advanced (e.g., NR) unless otherwise specified.

[0011] Furthermore, in the embodiments of the present invention described below, terms used in existing LTE, such as SS (Synchronization signal), PSS (Primary SS), SSS (Secondary SS), PBCH (Physical broadcast channel), PRACH (Physical random access channel), PDCCH (Physical Downlink Control Channel), PDSCH (Physical Downlink Shared Channel), PUCCH (Physical Uplink Control Channel), and PUSCH (Physical Uplink Shared Channel), are used. This is for convenience of description, and similar signals, functions, etc. may be referred to by other names. Furthermore, the above-mentioned terms in NR correspond to NR-SS, NR-PSS, NR-SSS, NR-PBCH, NR-PRACH, etc. However, even signals used in NR are not necessarily designated as "NR-".

[0012] Furthermore, in the embodiments of the present invention, the duplex method may be a TDD (Time Division Duplex) method, an FDD (Frequency Division Duplex) method, or other methods (for example, Flexible Duplex, etc.).

[0013] Furthermore, in the embodiments of the present invention, "configuring" radio parameters and the like may mean that predetermined values ​​are pre-configured, or that radio parameters notified from a base station or a terminal are set.

[0014] (System Configuration) Fig. 1 is a diagram for explaining a wireless communication system according to an embodiment of the present invention. As shown in Fig. 1, the wireless communication system according to the embodiment of the present invention includes a base station 10 and a terminal 20. Although Fig. 1 shows one base station 10 and one terminal 20, this is an example, and there may be a plurality of each.

[0015] The base station 10 is a communication device that provides one or more cells and performs wireless communication with the terminal 20. The physical resources of a wireless signal are defined in the time domain and the frequency domain, and the time domain may be defined by the number of Orthogonal Frequency Division Multiplexing (OFDM) symbols, and the frequency domain may be defined by the number of subcarriers or the number of resource blocks. Furthermore, a TTI (Transmission Time Interval) in the time domain may be a slot, or a TTI may be a subframe.

[0016] The base station 10 transmits a synchronization signal and system information to the terminal 20. The synchronization signal is, for example, NR-PSS and NR-SSS. The system information is transmitted, for example, via the NR-PBCH and is also referred to as broadcast information. The synchronization signal and system information may be referred to as an SSB (SS / PBCH block). As shown in FIG. 1 , the base station 10 transmits control signals or data to the terminal 20 via DL (Downlink) and receives control signals or data from the terminal 20 via UL (Uplink). Both the base station 10 and the terminal 20 are capable of transmitting and receiving signals by performing beamforming. Furthermore, both the base station 10 and the terminal 20 are capable of applying MIMO (Multiple Input Multiple Output) communication to DL or UL. Furthermore, both the base station 10 and the terminal 20 may communicate via a secondary cell (SCell) and a primary cell (PCell) using Carrier Aggregation (CA). Furthermore, the terminal 20 may perform communication via a primary cell of the base station 10 and a primary secondary cell group cell (PSCell: Primary SCG Cell) of another base station 10 using DC (Dual Connectivity).

[0017] The terminal 20 is a communication device equipped with a wireless communication function, such as a smartphone, a mobile phone, a tablet, a wearable terminal, or an M2M (Machine-to-Machine) communication module. As shown in FIG. 1, the terminal 20 receives control signals or data from the base station 10 via DL and transmits control signals or data to the base station 10 via UL, thereby utilizing various communication services provided by the wireless communication system. The terminal 20 also receives various reference signals transmitted from the base station 10 and measures the propagation path quality based on the reception results of the reference signals. The terminal 20 may also be referred to as a UE, and the base station 10 may also be referred to as a gNB.

[0018] A UE in an RRC connected state may monitor a paging occasion once per modification period. For example, it may monitor a notification of a system information change. If an active BWP is configured with a paging search space (PSS), the UE monitors the PDCCH scrambled with the P-RNTI based on the configured PSS. If an active BWP is not configured with a PSS, the UE does not monitor paging. If an active BWP is not configured with a PSS, the UE may acquire system information via the UL-DCCH.

[0019] Each UL-BWP can configure RACH resources to be used for both contention-based and contention-free random access (see Non-Patent Document 3). For example, the RACH configuration for BWP may be notified by information elements BWP-Uplink / BWP-UplinkCommon / RACH-ConfigCommon.

[0020] FIG. 2 is a diagram for explaining an example of the operation related to BWP switching in this embodiment. As shown in FIG. 2, when switching from BWP1 with 15 kHz SCS to BWP2 with 30 kHz SCS, a BWP switching delay occurs. For example, BWP switching may be supported as shown in the following cases. Note that "switching" and "switching" may be interchangeable.

[0021] Case 1) BWP switching may be performed by RRC reconfiguration using firstActiveDownlinkBWP-Id and / or firstActiveUplinkBWP-Id.

[0022] Case 2) BWP switching may be triggered by the expiration of the BWP inactivity timer (bwp-Inactivity timer). The UE starts or resets this timer when it receives DCI and performs DL and / or UL scheduling or transmits / receives with CG grant scheduling. This timer is decremented by 1 at the end of a subframe (FR1) or half subframe (FR2). When this timer expires, the BWP is switched to the "defaultDownlinkBWP-Id".

[0023] Case 3) BWP switching may be performed by DCI indicating BWP switching. BWP switching may be indicated by DCI, for example, DCI format 0_1 ​​or DCI format 1_1 having a "Bandwidth part indicator" field. The UE does not transmit or receive until the "slot offset" time from the end of the third symbol after receiving the DCI indicating BWP switching. The "slot offset" should be equal to or greater than the delay required for BWP switching. The "slot offset" is the offset between the PDCCH carrying the DCI and the PDSCH or PUSCH scheduled by the DCI.

[0024] Case 4) If there are no PRACH resources configured in the active UL-BWP, BWP switching for RACH may be performed.

[0025] In the above operation, a method is required to configure an additional PRACH resource of the BWP in the terminal and to control activation or deactivation of the additional PRACH resource of the BWP. However, it has not been clear how to realize these methods.

[0026] According to this embodiment, the configuration of parameters and control information (eg, DCI) that support the adaptation of additional PRACH resources for BWP is defined.

[0027] In this embodiment, the additional PRACH resources of the BWP may refer to the additional PRACH resources based on the BWP or the additional PRACH resources for the BWP.

[0028] Examples of the present embodiment will be described below. Each example may be implemented independently, or a plurality of examples may be combined and implemented.

[0029] Example 1 According to embodiment 1, the parameters of the additional PRACH resources of the BWP are defined.

[0030] According to Example 1-1, in the RRC_IDLE / RRC_INACTIVE state, the terminal 20 may be indicated with parameters of additional PRACH resources.

[0031] As shown in Fig. 3, in step S101, the terminal 20 is in an RRC_IDLE / RRC_INACTIVE state. In step S102, the base station 10 transmits an SIB (System Information Block) or RRC signaling including parameters of the additional PRACH resource to the terminal 20. The SIB may be, for example, SIB1, another existing SIB type, or a new SIB type. The RRC signaling may be signaling in an RRC release. In step S103, the terminal 20 configures the received parameters of the additional PRACH resource in the terminal.

[0032] 4, in step S201, the terminal 20 is in the RRC_CONNECTED state, and then in step S202, the base station 10 transmits parameters of the additional PRACH resource set based on any of Alt.1-1 to Alt.1-4 below to the terminal 20. In step S203, the terminal 20 sets the received parameters of the additional PRACH resource in the terminal.

[0033] Alt.1-1: The parameters of the additional PRACH resources may be individual parameters for each BWP and / or active BWP. That is, the parameters of the additional PRACH resources may be parameters that are set independently for each BWP and / or active BWP. For example, different parameters of the additional PRACH resources may be set for different BWPs.

[0034] Alt.1-2: The parameters of the additional PRACH resources may be common to all BWPs and / or configured BWPs. For example, all BWPs may have the same parameters of the additional PRACH resources. The frequency location and / or start frequency of the additional PRACH resources of each BWP may be specified based on an offset to PRB0 or ​​an offset to the start / middle / last PRB of the BWP by the parameter msg1-FrequencyStartOffset-r19. msg1-FrequencyStartOffset-r19 may be used to determine the start RB of the additional PRACH resources in each BWP.

[0035] Alt.1-3: Some parameters of the additional PRACH resource may be individual for each BWP and / or active BWP, while other parameters may be common for all BWPs and / or configured BWPs. For example, the PRACH time configuration (prach-ConfigurationIndex) may be common for all BWPs, and the start frequency (msg1-FrequencyStart) may be different for each BWP.

[0036] Alt.1-4: The parameters of the additional PRACH resources may be set based on at least one of Alt.1-1, Alt.1-2 or Alt.1-3.

[0037] In the above Examples 1-1 and 1-2, the parameters of the additional PRACH resources in the RRC_IDLE state may be reused for the initial UL BWP and / or UL BWP0.

[0038] In the above Examples 1-1 and 1-2, if parameters of additional PRACH resources for the initial UL BWP and / or UL BWP0 are not provided in the RRC_CONNECTED state, the terminal 20 may use parameters of additional PRACH resources provided in the RRC_IDLE / RRC_INACTIVE state for the initial UL BWP and / or UL BWP0 in the RRC_CONNECTED state.

[0039] In the above Examples 1-1 and 1-2, if parameters for additional PRACH resources for the initial UL BWP and / or UL BWP0 are provided in the RRC_CONNECTED state, the terminal 20 may use these parameters for the initial UL BWP and / or UL BWP0 in the RRC_CONNECTED state.

[0040] In Example 1-3, the operation of the terminal 20 when the BWP legacy PRACH resource is not configured for the terminal 20 in the RRC_CONNECTED state will be clarified. As shown in Fig. 5, in step S301, the terminal 20 is in the RRC_CONNECTED state. In step S302, when the BWP legacy PRACH resource is not configured for the terminal 20, the terminal 20 may perform the operation based on Alt.2-1 or Alt.2-2 below.

[0041] Alt.2-1: The terminal 20 may assume that no additional PRACH resources for the BWP are configured.

[0042] Alt.2-2: When additional PRACH resources are configured based on any of Alt.1-1 to Alt.1-4 in Example 1-2, the terminal 20 may assume Alt.2-2-1 or Alt.2-2-2 below.

[0043] Alt. 2-2-1: The terminal 20 may assume that there are no PRACH resources for BWP.

[0044] Alternative 2-2-2: The terminal 20 may assume that additional PRACH resources are configured for BWP.

[0045] As an example of Alt. 2-2-2, the terminal 20 may assume that the additional PRACH resources are always enabled, i.e., the terminal 20 can always use the additional PRACH resources of the BWP.

[0046] As an example of Alternative 2-2-2, the terminal 20 may assume that the additional PRACH resource can be enabled or disabled. For example, when the additional PRACH resource is disabled, it means that there is no PRACH resource for BWP.

[0047] In Examples 1-4, the operation of the terminal 20 when no additional PRACH resource is configured for BWP in the RRC_CONNECTED state will be clarified. As shown in Fig. 6, in step S401, the terminal 20 is in the RRC_CONNECTED state. In step S402, if no legacy PRACH resource for BWP is configured in the terminal 20, the terminal 20 may perform the following operation based on Alt.3-1 or Alt.3-2.

[0048] Alt.3-1: The terminal 20 may assume that additional PRACH resources are not supported for BWP. For example, the terminal 20 may assume that DCI or signaling instructing the activation or deactivation of additional PRACH resources for BWP is not transmitted. For example, the terminal 20 may not attempt to detect signaling instructing the activation or deactivation of additional PRACH resources for BWP.

[0049] Alt.3-2: The terminal 20 may determine additional PRACH resources for the BWP using the parameters of the additional PRACH configuration for the [initial BWP / initial UL BWP / specific BWP].

[0050] Example 2 According to a second embodiment, a DCI may be defined that supports adaptation of additional PRACH resources for BWP.

[0051] As shown in Fig. 7, in step S501, the terminal 20 is in the RRC_CONNECTED state. In step S502, the base station 10 transmits a DCI to the terminal 20, the DCI instructing the terminal 20 to enable or disable additional PRACH resources. The DCI instructing the terminal 20 to enable or disable additional PRACH resources in the RRC_CONNECTED state may be a DCI other than a paging DCI. In the following description of the embodiment, a DCI other than a paging DCI instructing the terminal 20 to enable or disable additional PRACH resources in the RRC_CONNECTED state is referred to as "another DCI."

[0052] In step S503, in controlling the activation or deactivation of additional PRACH resources in the RRC_CONNECTED state, the terminal 20 may perform an operation based on any of Alt. 1 to Alt. 4 below. Then, in step S504, the terminal 20 performs activation or deactivation of additional PRACH resources based on the received DCI (other DCI) by monitoring.

[0053] Alt. 1: The terminal 20 may monitor only paging DCI in the RRC_CONNECTED state.

[0054] Alt. 2: The terminal 20 may monitor only other DCI in the RRC_CONNECTED state.

[0055] Alt. 3: The terminal 20 may monitor both paging DCI and other DCI in the RRC_CONNECTED state.

[0056] Alt.3-1: The terminal 20 does not have to monitor both the paging DCI and the other DCI in one BWP. For example, the terminal 20 may monitor only either the paging DCI or the other DCI in one BWP. For example, the terminal 20 may monitor the paging DCI in the initial BWP and monitor the other DCI in another BWP.

[0057] Alt.3-2: The terminal 20 may monitor both the paging DCI and the other DCI in one BWP. For example, the terminal 20 may monitor both the paging DCI and the other DCI in an initial BWP and monitor the other DCI in another BWP.

[0058] Alt.4: The terminal 20 may monitor DCI based on one or more combinations of Alt.1 to Alt.3 (including Alt.3-1 and 3-2) according to the setting of the base station 10.

[0059] For example, the terminal 20 may be configured such that it may monitor only other DCIs in all BWPs.

[0060] For example, the terminal 20 may be configured to monitor both paging DCI and other DCI in all BWPs.

[0061] For example, the terminal 20 may be configured to monitor paging DCI in the initial BWP and monitor other DCI in other BWPs.

[0062] For example, the terminal 20 may be configured to monitor a paging DCI in the initial BWP and to monitor both the paging DCI and other DCI in other BWPs.

[0063] According to the third embodiment, the terminal 20 may have the capabilities related to the first and second embodiments as terminal capabilities and may report the terminal capabilities to the base station 10.

[0064] The terminal capabilities reported by the terminal 20 may include at least one of whether the operations (including each Alt. X) shown in the above-mentioned first and second embodiments can be performed (whether the operations are supported) or whether a combination of the operations shown in the first and second embodiments can be performed.

[0065] The terminal 20 may report the above-mentioned terminal capabilities for each frequency. The terminal capabilities may be reported, for example, for each terminal (UE), for each FR1, FR2, FR2-1, FR2-2, FR3 or SCS, for each band, for each BC (Band Combination), for each FC, or for each FSPC.

[0066] The terminal 20 may report the terminal capabilities for each cell. The terminal capabilities may be reported, for example, for each terminal (UE), for each cell, or for each TDD and FDD.

[0067] According to a modification of this embodiment, the terminal 20 may receive at least one of information by higher layer signaling (for example, an RRC message or an LPP message), MAC CE, or DCI from the network (for example, the base station 10).

[0068] The MAC CE may be a MAC CE that includes a new LCID in the subheader, or may be a new MAC CE that is an extension of an existing MAC CE (for example, a MAC CE in which a new octet is introduced).

[0069] The DCI field in the DCI may be an existing DCI field or a newly introduced DCI field. The DCI may be a DCI whose CRC is scrambled by an existing RNTI or a newly introduced RNTI. The DCI format may be an existing DCI format or a newly introduced DCI format.

[0070] According to a variant of this embodiment, the terminal 20 may receive information from the network periodically, semi-persistently or aperiodically. The trigger for receiving information semi-persistently or aperiodically may be based on an instruction from the terminal 20 or the base station 10.

[0071] According to the above-described embodiment of the present invention, the additional PRACH resource of the BWP can be configured in the terminal, and the activation or deactivation of the additional PRACH resource of the BWP can be controlled, so that the terminal can appropriately perform communication using the additional PRACH resource of the BWP.

[0072] (Device configuration) Next, a description will be given of an example of the functional configuration of the base station 10 and the terminal 20 that execute the processes and operations described above. The base station 10 and the terminal 20 include functions for executing the above-described embodiments. However, the base station 10 and the terminal 20 may each include only the functions proposed in any of the embodiments.

[0073] <Base station 10> Fig. 8 is a diagram showing an example of the functional configuration of a base station. As shown in Fig. 8, the base station 10 has a transmitting unit 110, a receiving unit 120, a setting unit 130, and a control unit 140. The functional configuration shown in Fig. 8 is merely an example. The names of the functional divisions and functional units may be any as long as they can perform the operations related to the embodiment of the present invention. The transmitting unit 110 and the receiving unit 120 may be called a communication unit.

[0074] The transmitter 110 has a function of generating a signal to be transmitted to the terminal 20 and transmitting the signal wirelessly. The receiver 120 has a function of receiving various signals transmitted from the terminal 20 and acquiring, for example, information of a higher layer from the received signal. The transmitter 110 also has a function of transmitting NR-PSS, NR-SSS, NR-PBCH, DL / UL control signals, DL data, etc. to the terminal 20. The transmitter 110 also transmits the setting information, etc., described in the embodiments.

[0075] The setting unit 130 stores preset setting information and various setting information to be transmitted to the terminal 20 in a storage device, and reads out the information from the storage device as needed. The control unit 140 performs, for example, overall control of the base station 10, including control related to signal transmission and reception. Note that the functional unit related to signal transmission in the control unit 140 may be included in the transmitting unit 110, and the functional unit related to signal reception in the control unit 140 may be included in the receiving unit 120. Furthermore, the transmitting unit 110 and the receiving unit 120 may be called a transmitter and a receiver, respectively.

[0076] <Terminal 20> Fig. 9 is a diagram showing an example of the functional configuration of a terminal. As shown in Fig. 9, terminal 20 has a transmitting unit 210, a receiving unit 220, a setting unit 230, and a control unit 240. The functional configuration shown in Fig. 9 is merely an example. As long as the operations related to the embodiment of the present invention can be performed, the names of the functional divisions and functional units may be any. The transmitting unit 210 and the receiving unit 220 may be called a communication unit.

[0077] The transmitter 210 creates a transmission signal from the transmission data and transmits the transmission signal wirelessly. The receiver 220 receives various signals wirelessly and acquires higher layer signals from the received physical layer signals. The transmitter 210 also transmits HARQ-ACK, and the receiver 220 receives the setting information and the like described in the embodiments.

[0078] The setting unit 230 stores various setting information received from the base station 10 by the receiving unit 220 in a storage device, and reads it out from the storage device as needed. The setting unit 230 also stores setting information that is set in advance. The control unit 240 performs overall control of the terminal 20, including control related to signal transmission and reception. Note that the functional unit related to signal transmission in the control unit 240 may be included in the transmitting unit 210, and the functional unit related to signal reception in the control unit 240 may be included in the receiving unit 220. The transmitting unit 210 and the receiving unit 220 may also be called a transmitter and a receiver, respectively.

[0079] The terminal or base station of this embodiment may be configured as a terminal or base station shown in each of the following items. Also, the following communication method may be implemented.

[0080] <Configuration of this embodiment> (Additional note 1) a receiving unit for receiving information including parameters of additional PRACH (Physical random access channel) resources from a base station; a control unit that sets parameters of the received additional PRACH resource in the terminal. (Additional note 2) The terminal is in an RRC (Radio Resource Control)_IDLE state or an RRC_INACTIVE state, The terminal described in Supplementary Claim 1, wherein the information is signaling in a system information block or an RRC release. (Additional note 3) The terminal is in an RRC_CONNECTED state, The terminal according to Supplementary claim 1, wherein the parameters of the additional PRACH resources are parameters that are set individually for each BWP or parameters that are set commonly for all BWPs. (Additional note 4) The terminal is in an RRC_CONNECTED state, The terminal according to Supplementary Claim 1, wherein, if parameters of additional PRACH resources for an initial UL (Uplink) BWP have not been provided to the terminal, the control unit uses parameters of additional PRACH resources provided in an RRC_IDLE or RRC_INACTIVE state for the initial UL BWP in the RRC_CONNECTED state. (Additional note 5) The terminal is in an RRC_CONNECTED state, The receiver receives, from the base station, predetermined downlink control information instructing activation or deactivation of an additional PRACH resource; the control unit controls enabling or disabling of the additional PRACH resource based on the predetermined downlink control information; The terminal according to Supplementary Item 1, wherein the predetermined downlink control information is different from paging downlink control information. (Additional note 6) A communication method performed by a terminal, comprising: receiving information from a base station, the information including parameters of additional PRACH (Physical random access channel) resources; and configuring the parameters of the received additional PRACH resources in the terminal.

[0081] Any of the above configurations can configure the additional PRACH resource of the BWP in the terminal and control the activation or deactivation of the additional PRACH resource of the BWP, thereby allowing the terminal to appropriately perform communication using the additional PRACH resource of the BWP.

[0082] (Hardware configuration) The block diagrams (FIGS. 8 and 9) used to explain the above embodiments show functional blocks. These functional blocks (components) are realized by any combination of at least one of hardware and software. Furthermore, the method for realizing each functional block is not particularly limited. That is, each functional block may be realized using a single device that is physically or logically coupled, or may be realized using two or more physically or logically separated devices that are connected directly or indirectly (for example, by wire, wirelessly, etc.) and these multiple devices. The functional block may also be realized by combining the single device or the multiple devices with software.

[0083] Functions include, but are not limited to, judgment, determination, judgment, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, election, establishment, comparison, assumption, expectation, consideration, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocation, mapping, and assignment. For example, a functional block (component) that performs transmission is called a transmitting unit or transmitter. As mentioned above, there are no particular limitations on how these functions are implemented.

[0084] For example, the base station 10, the terminal 20, etc. according to an embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure. Fig. 10 is a diagram illustrating an example of the hardware configuration of the base station 10 and the terminal 20 according to an embodiment of the present disclosure. The base station 10 and the terminal 20 described above may be physically configured as a computer device including a processor 1001, a storage device 1002, an auxiliary storage device 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, etc.

[0085] In the following description, the term "apparatus" can be read as a circuit, a device, a unit, etc. The hardware configuration of the base station 10 and the terminal 20 may be configured to include one or more of the apparatuses shown in the drawings, or may be configured to exclude some of the apparatuses.

[0086] Each function in the base station 10 and the terminal 20 is realized by loading predetermined software (programs) onto hardware such as the processor 1001, the memory device 1002, etc., so that the processor 1001 performs calculations, controls communication by the communication device 1004, and controls at least one of reading and writing data in the memory device 1002 and the auxiliary memory device 1003.

[0087] The processor 1001 controls the entire computer by running, for example, an operating system. The processor 1001 may be configured as a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic unit, a register, etc. For example, the above-mentioned control unit 140, control unit 240, etc. may be realized by the processor 1001.

[0088] Furthermore, the processor 1001 reads programs (program codes), software modules, data, etc. from at least one of the auxiliary storage device 1003 and the communication device 1004 into the storage device 1002, and executes various processes in accordance with the programs. The programs used are those that cause a computer to execute at least some of the operations described in the above-described embodiments. For example, the control unit 140 of the base station 10 shown in FIG. 8 may be implemented by a control program stored in the storage device 1002 and executed by the processor 1001. Furthermore, for example, the control unit 240 of the terminal 20 shown in FIG. 9 may be implemented by a control program stored in the storage device 1002 and executed by the processor 1001. While the above-described various processes have been described as being executed by one processor 1001, they may also be executed simultaneously or sequentially by two or more processors 1001. The processor 1001 may be implemented by one or more chips. The programs may be transmitted from a network via a telecommunications line.

[0089] The storage device 1002 is a computer-readable recording medium and may be configured, for example, by at least one of a read-only memory (ROM), an erasable programmable ROM (EPROM), an electrically erasable programmable ROM (EEPROM), a random access memory (RAM), etc. The storage device 1002 may also be called a register, a cache, a main memory, etc. The storage device 1002 can store executable programs (program codes), software modules, etc. for implementing a communication method according to an embodiment of the present disclosure.

[0090] The secondary storage device 1003 is a computer-readable recording medium, and may be, for example, at least one of an optical disk such as a CD-ROM (Compact Disc ROM), a hard disk drive, a flexible disk, a magneto-optical disk (e.g., a compact disk, a digital versatile disk, a Blu-ray disc), a smart card, a flash memory (e.g., a card, a stick, a key drive), a floppy disk, a magnetic strip, etc. The above-mentioned storage medium may be, for example, a database, a server, or other suitable medium including at least one of the storage device 1002 and the secondary storage device 1003.

[0091] The communication device 1004 is hardware (transmission / reception device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as, for example, a network device, a network controller, a network card, or a communication module. The communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. to realize at least one of frequency division duplex (FDD) and time division duplex (TDD). For example, a transmission / reception antenna, an amplifier unit, a transmission / reception unit, a transmission path interface, etc. may be realized by the communication device 1004. The transmission / reception unit may be implemented as a transmission unit and a reception unit that are physically or logically separated.

[0092] The input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that receives input from the outside. The output device 1006 is an output device (for example, a display, a speaker, an LED lamp, etc.) that outputs to the outside. The input device 1005 and the output device 1006 may be integrated into one device (for example, a touch panel).

[0093] Furthermore, each device such as the processor 1001 and the storage device 1002 is connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or may be configured using different buses between each device.

[0094] Furthermore, base station 10 and terminal 20 may be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), or a field programmable gate array (FPGA), and some or all of the functional blocks may be realized by the hardware. For example, processor 1001 may be implemented using at least one of these pieces of hardware.

[0095] Fig. 11 shows an example configuration of a vehicle 2001. As shown in Fig. 11, the vehicle 2001 includes a drive unit 2002, a steering unit 2003, an accelerator pedal 2004, a brake pedal 2005, a shift lever 2006, front wheels 2007, rear wheels 2008, an axle 2009, an electronic control unit 2010, various sensors 2021 to 2029, an information service unit 2012, and a communication module 2013. Each aspect / embodiment described in the present disclosure may be applied to a communication device mounted on the vehicle 2001, and may be applied to the communication module 2013, for example.

[0096] The drive unit 2002 is configured, for example, by an engine, a motor, or a hybrid of an engine and a motor. The steering unit 2003 includes at least a steering wheel (also called a handle), and is configured to steer at least one of the front wheels and the rear wheels based on the operation of the steering wheel operated by the user.

[0097] The electronic control unit 2010 is composed of a microprocessor 2031, a memory (ROM, RAM) 2032, and a communication port (IO port) 2033. Signals are input to the electronic control unit 2010 from various sensors 2021 to 2029 provided in the vehicle 2001. The electronic control unit 2010 may also be called an ECU (Electronic Control Unit).

[0098] The signals from the various sensors 2021 to 2029 include a current signal from a current sensor 2021 that senses the current of the motor, a rotation speed signal of the front and rear wheels obtained by a rotation speed sensor 2022, an air pressure signal of the front and rear wheels obtained by an air pressure sensor 2023, a vehicle speed signal obtained by a vehicle speed sensor 2024, an acceleration signal obtained by an acceleration sensor 2025, an accelerator pedal depression amount signal obtained by an accelerator pedal sensor 2029, a brake pedal depression amount signal obtained by a brake pedal sensor 2026, a shift lever operation signal obtained by a shift lever sensor 2027, and a detection signal for detecting obstacles, vehicles, pedestrians, etc. obtained by an object detection sensor 2028.

[0099] The information service unit 2012 is composed of various devices, such as a car navigation system, an audio system, speakers, a television, and a radio, for providing various types of information such as driving information, traffic information, and entertainment information, and one or more ECUs for controlling these devices. The information service unit 2012 uses information obtained from external devices via the communication module 2013, etc., to provide various types of multimedia information and multimedia services to the occupants of the vehicle 2001.

[0100] The driving assistance system unit 2030 is composed of various devices that provide functions for preventing accidents and reducing the driver's driving burden, such as a millimeter-wave radar, a LiDAR (Light Detection and Ranging), a camera, a positioning locator (e.g., GNSS, etc.), map information (e.g., high-definition (HD) map, autonomous vehicle (AV) map, etc.), a gyro system (e.g., an IMU (Inertial Measurement Unit), an INS (Inertial Navigation System), etc.), an AI (Artificial Intelligence) chip, and an AI processor, as well as one or more ECUs that control these devices. The driving assistance system unit 2030 also transmits and receives various information via the communication module 2013 to realize the driving assistance function or the autonomous driving function.

[0101] The communication module 2013 can communicate with the microprocessor 2031 and components of the vehicle 2001 via the communication port. For example, the communication module 2013 transmits and receives data via the communication port 2033 to and from the drive unit 2002, steering unit 2003, accelerator pedal 2004, brake pedal 2005, shift lever 2006, front wheels 2007, rear wheels 2008, axle 2009, microprocessor 2031 and memory (ROM, RAM) 2032 in the electronic control unit 2010, and sensors 2021 to 29, which are provided in the vehicle 2001.

[0102] The communication module 2013 is a communication device that can be controlled by the microprocessor 2031 of the electronic control unit 2010 and can communicate with an external device. For example, it transmits and receives various information to and from the external device via wireless communication. The communication module 2013 may be located either inside or outside the electronic control unit 2010. The external device may be, for example, a base station, a mobile station, or the like.

[0103] The communication module 2013 transmits, via wireless communication to an external device, a current signal from the current sensor that is input to the electronic control unit 2010. The communication module 2013 also transmits, via wireless communication to an external device, the rotation speed signals of the front and rear wheels acquired by a rotation speed sensor 2022, the air pressure signals of the front and rear wheels acquired by an air pressure sensor 2023, the vehicle speed signal acquired by a vehicle speed sensor 2024, the acceleration signal acquired by an acceleration sensor 2025, the accelerator pedal depression amount signal acquired by an accelerator pedal sensor 2029, the brake pedal depression amount signal acquired by a brake pedal sensor 2026, the shift lever operation signal acquired by a shift lever sensor 2027, and the detection signals for detecting obstacles, vehicles, pedestrians, etc. acquired by an object detection sensor 2028, which are input to the electronic control unit 2010.

[0104] The communication module 2013 receives various information (traffic information, traffic signal information, inter-vehicle information, etc.) transmitted from external devices and displays it on an information service unit 2012 provided in the vehicle 2001. The communication module 2013 also stores the various information received from the external devices in a memory 2032 that can be used by the microprocessor 2031. Based on the information stored in the memory 2032, the microprocessor 2031 may control the drive unit 2002, steering unit 2003, accelerator pedal 2004, brake pedal 2005, shift lever 2006, front wheels 2007, rear wheels 2008, axle 2009, sensors 2021 to 2029, etc. provided in the vehicle 2001.

[0105] (Supplementary explanation of the embodiment) Although the embodiments of the present invention have been described above, the disclosed invention is not limited to such embodiments, and those skilled in the art will understand various modifications, alterations, alternatives, and substitutions. While specific numerical examples have been used to facilitate understanding of the invention, unless otherwise specified, these numerical values ​​are merely examples, and any appropriate values ​​may be used. The division of items in the above description is not essential to the present invention; two or more items may be combined as needed, and items described in one item may apply to items described in another item (unless inconsistent). The boundaries between functional units or processing units in the functional block diagram do not necessarily correspond to the boundaries between physical components. The operations of multiple functional units may be performed by a single physical component, or the operations of a single functional unit may be performed by multiple physical components. The order of the processing steps described in the embodiments may be reversed as long as there is no contradiction. For convenience of processing description, the base station 10 and terminal 20 have been described using functional block diagrams. However, such devices may be implemented using hardware, software, or a combination thereof. The software operated by the processor of the base station 10 in accordance with an embodiment of the present invention and the software operated by the processor of the terminal 20 in accordance with an embodiment of the present invention may each be stored in random access memory (RAM), flash memory, read-only memory (ROM), EPROM, EEPROM, registers, hard disk (HDD), removable disk, CD-ROM, database, server or any other suitable storage medium.

[0106] Furthermore, the notification of information is not limited to the aspects / embodiments described in the present disclosure, and may be performed using other methods. For example, the notification of information may be performed by physical layer signaling (e.g., Downlink Control Information (DCI), Uplink Control Information (UCI)), higher layer signaling (e.g., Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling), broadcast information (Master Information Block (MIB), System Information Block (SIB)), other signals, or a combination thereof. Furthermore, the RRC signaling may be referred to as an RRC message, and may be, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, or the like.

[0107] Each aspect / embodiment described in the present disclosure may be any of the following: LTE (Long Term Evolution), LTE-Advanced (LTE-A), SUPER 3G, IMT-Advanced, 4G (4th generation mobile communication system), 5G (5th generation mobile communication system), 6th generation mobile communication system (6G), xth generation mobile communication system (xG) (xG (x is, for example, an integer or decimal number)), FRA (Future Radio Access), NR (new Radio), New radio access (NX), Future generation radio access (FX), W-CDMA (registered trademark), GSM (registered trademark), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE The present invention may be applied to at least one of systems using 802.20, UWB (Ultra-Wideband), Bluetooth (registered trademark), or other appropriate systems, and next-generation systems that are extended, modified, created, or defined based on these systems. The present invention may also be applied to a combination of multiple systems (e.g., a combination of at least one of LTE and LTE-A with 5G).

[0108] The order of the procedures, sequences, flowcharts, etc. of each aspect / embodiment described herein may be changed unless it is consistent. For example, the methods described in this disclosure present elements of various steps using an example order and are not limited to the particular order presented.

[0109] In this specification, a specific operation that is described as being performed by the base station 10 may also be performed by its upper node in some cases. In a network consisting of one or more network nodes having the base station 10, it is clear that various operations performed for communication with the terminal 20 may be performed by at least one of the base station 10 and another network node other than the base station 10 (such as, but not limited to, an MME or an S-GW). Although the above example illustrates a case where there is one other network node other than the base station 10, the other network node may be a combination of multiple other network nodes (such as an MME and an S-GW).

[0110] The information or signals described in the present disclosure may be output from a higher layer (or a lower layer) to a lower layer (or a higher layer), or may be input / output via multiple network nodes.

[0111] Input and output information may be stored in a specific location (for example, memory) or may be managed using a management table. Input and output information may be overwritten, updated, or added to. Output information may be deleted. Input information may be sent to another device.

[0112] In the present disclosure, the determination may be made based on a value represented by one bit (0 or 1), a Boolean value (true or false), or a numerical comparison (e.g., comparison with a predetermined value).

[0113] Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.

[0114] Software, instructions, information, etc. may also be transmitted or received over a transmission medium. For example, if software is transmitted from a website, server, or other remote source using wired technologies (such as coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL)), and / or wireless technologies (such as infrared, microwave), then these wired and / or wireless technologies are included within the definition of transmission media.

[0115] The information, signals, etc. described in this disclosure may be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0116] Note that terms explained in this disclosure and terms necessary for understanding this disclosure may be replaced with terms having the same or similar meanings. For example, at least one of a channel and a symbol may be a signal (signaling). Furthermore, a signal may be a message. Furthermore, a component carrier (CC) may be called a carrier frequency, a cell, a frequency carrier, etc.

[0117] As used in this disclosure, the terms "system" and "network" are used interchangeably.

[0118] Furthermore, the information, parameters, etc. described in the present disclosure may be expressed using absolute values, may be expressed using relative values ​​from a predetermined value, or may be expressed using other corresponding information. For example, a radio resource may be indicated by an index.

[0119] The names used for the above-described parameters are not intended to be limiting in any way. Furthermore, the mathematical expressions using these parameters may differ from those explicitly disclosed in this disclosure. The various channels (e.g., PUCCH, PDCCH, etc.) and information elements may be identified by any suitable names, and therefore the various names assigned to these various channels and information elements are not intended to be limiting in any way.

[0120] In this disclosure, terms such as "base station (BS)," "radio base station," "base station," "fixed station," "NodeB," "eNodeB (eNB)," "gNodeB (gNB)," "access point," "transmission point," "reception point," "transmission / reception point," "cell," "sector," "cell group," "carrier," and "component carrier" may be used interchangeably. Base stations may also be referred to by terms such as macrocell, small cell, femtocell, and picocell.

[0121] A base station can accommodate one or more (e.g., three) cells. When a base station accommodates multiple cells, the overall coverage area of ​​the base station can be divided into multiple smaller areas, and each smaller area can be provided with communication service by a base station subsystem (e.g., a small indoor base station (RRH: Remote Radio Head)). The term "cell" or "sector" refers to a part or the entire coverage area of ​​a base station and / or base station subsystem that provides communication service within that coverage.

[0122] In this disclosure, the terms "Mobile Station (MS)," "user terminal," "User Equipment (UE)," "terminal," etc. may be used interchangeably.

[0123] A mobile station may also be referred to by those skilled in the art as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable terminology.

[0124] At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a communication device, etc. At least one of the base station and the mobile station may be a device mounted on a mobile body, or the mobile body itself. The mobile body may be a vehicle (e.g., a car, an airplane, etc.), an unmanned mobile body (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). At least one of the base station and the mobile station may also include devices that do not necessarily move during communication operations. For example, at least one of the base station and the mobile station may be an IoT (Internet of Things) device such as a sensor.

[0125] Furthermore, a base station in the present disclosure may be read as a user terminal. For example, the aspects / embodiments of the present disclosure may be applied to a configuration in which communication between a base station and a user terminal is replaced with communication between a plurality of terminals 20 (which may be called, for example, D2D (Device-to-Device) or V2X (Vehicle-to-Everything)). In this case, the terminal 20 may be configured to have the functions of the base station 10 described above. Furthermore, terms such as "uplink" and "downlink" may be read as terms corresponding to terminal-to-terminal communication (for example, "side"). For example, terms such as an uplink channel and a downlink channel may be read as a side channel.

[0126] Similarly, the user terminal in the present disclosure may be read as a base station, in which case the base station may be configured to have the functions of the user terminal described above.

[0127] As used in this disclosure, the terms "determining" and "determining" may encompass a wide variety of actions. "Determining" and "determining" may include, for example, judging, calculating, computing, processing, deriving, investigating, looking up, searching, inquiring (e.g., searching in a table, database, or other data structure), ascertaining, and the like. "Determining" and "determining" may also include receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, accessing (e.g., accessing data in memory), and the like. Furthermore, "judgment" and "decision" can include regarding resolving, selecting, choosing, establishing, comparing, etc. as having been "judged" or "decided." In other words, "judgment" and "decision" can include regarding some action as having been "judged" or "decided." Furthermore, "judgment (decision)" can be interpreted as "assuming," "expecting," "considering," etc.

[0128] The terms "connected," "coupled," or any variation thereof, refer to any direct or indirect connection or coupling between two or more elements, and may include the presence of one or more intermediate elements between two elements that are "connected" or "coupled" to each other. The coupling or connection between elements may be physical, logical, or a combination thereof. For example, "connected" may be read as "access." As used in this disclosure, two elements may be considered to be "connected" or "coupled" to each other using one or more wires, cables, and / or printed electrical connections, as well as electromagnetic energy having wavelengths in the radio frequency range, microwave range, and optical (both visible and invisible) range, as some non-limiting and non-exhaustive examples.

[0129] The reference signal may be abbreviated as RS (Reference Signal) or may be called a pilot depending on the applicable standard.

[0130] As used in this disclosure, the phrase "based on" does not mean "based only on," unless expressly stated otherwise. In other words, the phrase "based on" means both "based only on" and "based at least on."

[0131] As used in this disclosure, any reference to an element using a designation such as "first," "second," etc. does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Thus, a reference to a first and a second element does not imply that only two elements may be employed or that the first element must in some way precede the second element.

[0132] The "means" in the configuration of each of the above devices may be replaced with "part," "circuit," "device," etc.

[0133] When used in this disclosure, the terms "include," "including," and variations thereof are intended to be inclusive, similar to the term "comprising." Furthermore, when used in this disclosure, the term "or" is not intended to be an exclusive or.

[0134] A radio frame may be composed of one or more frames in the time domain. Each of the one or more frames in the time domain may be called a subframe. A subframe may further be composed of one or more slots in the time domain. A subframe may have a fixed time length (e.g., 1 ms) that is independent of numerology.

[0135] Numerology may be communication parameters that apply to at least one of transmission and reception of a signal or channel, such as subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame structure, specific filtering operations performed by the transceiver in the frequency domain, and specific windowing operations performed by the transceiver in the time domain.

[0136] A slot may be composed of one or more symbols (such as an Orthogonal Frequency Division Multiplexing (OFDM) symbol or a Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol) in the time domain. A slot may be a time unit based on numerology.

[0137] A slot may include multiple minislots. Each minislot may consist of one or multiple symbols in the time domain. A minislot may also be called a subslot. A minislot may consist of fewer symbols than a slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a minislot may be called PDSCH (or PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a minislot may be called PDSCH (or PUSCH) mapping type B.

[0138] The radio frame, subframe, slot, minislot, and symbol all represent time units for transmitting signals, and may be referred to by other names corresponding to the radio frame, subframe, slot, minislot, and symbol.

[0139] For example, one subframe may be called a transmission time interval (TTI), multiple consecutive subframes may be called a TTI, or one slot or one minislot may be called a TTI. That is, at least one of the subframe and the TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (for example, 1-13 symbols), or a period longer than 1 ms. Note that the unit representing the TTI may be called a slot, minislot, etc. instead of a subframe.

[0140] Here, TTI refers to, for example, the smallest time unit for scheduling in wireless communication. For example, in an LTE system, a base station performs scheduling to allocate wireless resources (such as frequency bandwidth and transmission power that can be used by each terminal 20) to each terminal 20 in TTI units. Note that the definition of TTI is not limited to this.

[0141] The TTI may be a transmission time unit for a channel-encoded data packet (transport block), a code block, a code word, etc., or may be a processing unit for scheduling, link adaptation, etc. When a TTI is given, the time interval (e.g., the number of symbols) to which a transport block, a code block, a code word, etc. is actually mapped may be shorter than the TTI.

[0142] When one slot or one minislot is called a TTI, one or more TTIs (i.e., one or more slots or one or more minislots) may be the minimum time unit for scheduling. Also, the number of slots (minislots) constituting the minimum time unit for scheduling may be controlled.

[0143] A TTI having a time length of 1 ms may be called a regular TTI (TTI in LTE Rel. 8-12), normal TTI, long TTI, regular subframe, normal subframe, long subframe, slot, etc. A TTI shorter than a regular TTI may be called a shortened TTI, short TTI, partial or fractional TTI, shortened subframe, short subframe, minislot, subslot, slot, etc.

[0144] In addition, a long TTI (e.g., a normal TTI, a subframe, etc.) may be interpreted as a TTI having a time length of more than 1 ms, and a short TTI (e.g., a shortened TTI, etc.) may be interpreted as a TTI having a TTI length shorter than the TTI length of a long TTI and equal to or greater than 1 ms.

[0145] A resource block (RB) is a resource allocation unit in the time domain and frequency domain, and may include one or more consecutive subcarriers in the frequency domain. The number of subcarriers included in an RB may be the same regardless of numerology, for example, 12. The number of subcarriers included in an RB may also be determined based on numerology.

[0146] The time domain of an RB may include one or more symbols and may have a length of one slot, one minislot, one subframe, or one TTI. One TTI, one subframe, etc. may each be composed of one or more resource blocks.

[0147] Note that one or more RBs may also be called a physical resource block (PRB), a sub-carrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, or the like.

[0148] Furthermore, a resource block may be composed of one or more resource elements (REs). For example, one RE may be a radio resource region of one subcarrier and one symbol.

[0149] A Bandwidth Part (BWP) (which may also be referred to as a fractional bandwidth) may represent a subset of contiguous common resource blocks (RBs) for a given numerology on a given carrier, where the common RBs may be identified by their index relative to a common reference point of the carrier. PRBs may be defined in a given BWP and numbered within that BWP.

[0150] The BWP may include a BWP for UL (UL BWP) and a BWP for DL ​​(DL BWP). One or more BWPs may be set for the terminal 20 within one carrier.

[0151] At least one of the configured BWPs may be active, and the terminal 20 may not expect to transmit or receive a predetermined signal / channel outside the active BWP. Note that the terms "cell," "carrier," and the like in this disclosure may be read as "BWP."

[0152] The above-described structures of radio frames, subframes, slots, minislots, symbols, etc. are merely examples. For example, the number of subframes included in a radio frame, the number of slots per subframe or radio frame, the number of minislots included in a slot, the number of symbols and RBs included in a slot or minislot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, the cyclic prefix (CP) length, etc. may be changed in various ways.

[0153] In this disclosure, where articles are added by translation, such as a, an, and the in English, the disclosure may include that the nouns following these articles are in the plural form.

[0154] In the present disclosure, the term "A and B are different" may mean "A and B are different from each other." The term may also mean "A and B are each different from C." Terms such as "separate" and "coupled" may also be interpreted in the same way as "different."

[0155] Each aspect / embodiment described in this disclosure may be used alone, in combination, or switched depending on the implementation. Furthermore, notification of predetermined information (e.g., notification that "X is true") is not limited to being done explicitly, but may be done implicitly (e.g., by not notifying the predetermined information).

[0156] Although the present disclosure has been described in detail above, it is clear to those skilled in the art that the present disclosure is not limited to the embodiments described herein. The present disclosure can be implemented in modified and altered forms without departing from the spirit and scope of the present disclosure as defined by the claims. Therefore, the description of the present disclosure is intended to be illustrative and does not have any limiting meaning on the present disclosure. [Explanation of symbols]

[0157] 10 base station 110 Transmitter 120 Receiver 130 Setting section 140 Control Unit 20 terminals 210 Transmitter 220 Receiving unit 230 Setting Section 240 Control Unit 1001 processor 1002 Storage device 1003 Auxiliary storage device 1004 Communication equipment 1005 Input Device 1006 Output Device 2001 Vehicle 2002 Drive unit 2003 Steering section 2004 accelerator pedal 2005 brake pedal 2006 Shift Lever 2007 front wheel 2008 rear wheel 2009 Axle 2010 Electronic Control Unit 2012 Information Services Department 2013 Communication Module 2021 Current Sensor 2022 RPM Sensor 2023 Air Pressure Sensor 2024 Vehicle speed sensor 2025 Acceleration Sensor 2026 Brake pedal sensor 2027 Shift lever sensor 2028 Object Detection Sensor 2029 Accelerator pedal sensor 2030 Driving Assistance Systems Department 2031 microprocessor 2032 memory (ROM, RAM) 2033 Communication port (IO port)

Claims

1. a receiving unit for receiving information including parameters of additional PRACH (Physical random access channel) resources from a base station; a control unit that sets parameters of the received additional PRACH resource in the terminal.

2. The terminal is in an RRC (Radio Resource Control)_IDLE state or an RRC_INACTIVE state, The terminal of claim 1 , wherein the information is signaling in a system information block or an RRC release.

3. The terminal is in an RRC_CONNECTED state, The terminal according to claim 1 , wherein the parameters of the additional PRACH resources are parameters that are individually set for each BWP or parameters that are commonly set for all BWPs.

4. The terminal is in an RRC_CONNECTED state, 2. The terminal according to claim 1, wherein, if parameters of additional PRACH resources for an initial UL (Uplink) BWP are not provided for the terminal, the control unit uses parameters of additional PRACH resources provided in an RRC_IDLE or RRC_INACTIVE state for the initial UL BWP in the RRC_CONNECTED state.

5. The terminal is in an RRC_CONNECTED state, The receiver receives, from the base station, predetermined downlink control information instructing activation or deactivation of an additional PRACH resource; the control unit controls enabling or disabling of the additional PRACH resource based on the predetermined downlink control information; The terminal according to claim 1 , wherein the predetermined downlink control information is different from paging downlink control information.

6. A communication method performed by a terminal, comprising: receiving information from a base station, the information including parameters of additional PRACH (Physical random access channel) resources; and configuring the parameters of the received additional PRACH resources in the terminal.

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