TERMINAL, METHOD BY A TERMINAL AND BASE STATION APPARATUS RELATED TO A RESOURCE ALLOCATION SCHEME OF RACH

Abstract

A rach resource allocation scheme is revealed. One aspect of the present invention relates to a base station including a rach resource allocation unit that allocates a rach band that includes a random access channel (rach) resource to which respective indices are assigned in a frequency direction and a random access processing (ra) unit that indicates a frequency position of the rach resources to the user equipment.

Description

1 / 30 TERMINAL, METHOD BY A TERMINAL AND BASE STATION APPARATUS RELATED TO A RESOURCE ALLOCATION SCHEME OF RACH TECHNICAL FIELD

[001] The present invention relates to a radio communication system. TECHNICAL BACKGROUND

[002] Currently in the 3GPP (Partnership Project for the 35th Generation), specifications have been developed for a new radio communication system called the New Radio Access Technology (NR) system as a successor to the LTE (Long Term Evolution) system and the LTE-Advanced system.

[003] In NR, it is assumed that, as a portion of the bandwidth (BWP), a bandwidth position and a bandwidth are allocated based on user equipment (UE). Furthermore, it is assumed that until a BWP is allocated to the UE, namely, while performing initial access, an initial active BWP is provided, for example, based on a cell, and a downlink signal used for initial access is transmitted within the initial active BWP.

[004] It is assumed that the initial active BWP has a bandwidth less than or equal to a minimum bandwidth that can be supported by any UE. However, details about the initial active BWP were not determined in the standardization discussions. Prior Art Documents [Non-Patent Document]

[005] Non-Patent Document 1: RP-171994 TR 38.211 v1.0.0 on NR; Physical channels and modulation; for information, 3GPP TSG-RAN Meeting #77 Tdoc RP-171994 Sapporo, Japan, September 11-14, 2017 Petition 870250097680, dated 10 / 24 / 2025, page 13 / 48 2 / 30 Non-Patent Document 2: RP-171995 TS 38.213 vl.0.0 on NR; Physical layer procedures for control; for information, see 3GPP TSGRAN Meeting # 77 Sapporo, Japan, September 11-14, 2017 SUMMARY OF THE INVENTION [PROBLEM TO BE SOLVED BY THE INVENTION]

[006] Details regarding the allocation signaling and frequency position of random access channel (RACH) resources for transmitting an uplink signal for initial access have not been determined. In general, resource allocation that allows flexible scheduling of multiple channels, including a RACH, while increasing the occasions for initial access, is desirable.

[007] In view of the foregoing, an object of the present invention is to provide a resource allocation scheme for RACH. [WAYS TO SOLVE THE PROBLEM]

[008] In order to solve the above problem, one aspect of the present invention relates to a base station including a RACH resource allocation unit that allocates a RACH band that includes a random access channel (RACH) resource to which respective indices are assigned in a frequency direction and a random access processing (RA) unit that indicates a frequency position of the RACH resources to the user equipment. [ADVANTAGES OF THE INVENTION]

[009] According to the present invention, a resource allocation scheme for RACH can be provided. BRIEF DESCRIPTION OF THE FIGURES

[010] FIG. 1 is a schematic diagram illustrating a radio communication system according to an embodiment of the present invention; Petition 870250097680, dated 10 / 24 / 2025, page 14 / 48 3 / 30 FIG. 2 is a block diagram illustrating a functional configuration of a base station according to an embodiment of the present invention; FIG. 3 is a diagram illustrating the allocation of RACH resources according to one embodiment of the present invention; FIG. 4 is a diagram illustrating the allocation of RACH resources according to one embodiment of the present invention; FIG. 5 is a diagram illustrating the allocation of RACH resources according to one embodiment of the present invention; FIG. 6 is a diagram illustrating the allocation of RACH resources according to one embodiment of the present invention; FIG. 7 is a diagram illustrating the allocation of RACH resources according to one embodiment of the present invention; FIG. 8 is a diagram illustrating an association between SS blocks and RACH bands according to an embodiment of the present invention; FIG. 9 is a diagram illustrating an association between SS blocks and RACH bands according to an embodiment of the present invention; FIG. 10 is a block diagram illustrating a functional configuration of a user device according to an embodiment of the present invention; and FIG. 11 is a block diagram illustrating a hardware configuration of the base station and user equipment according to an embodiment of the present invention. [INVENTION MODALITIES]

[011] In what follows, embodiments of the invention are described with reference to the figures.

[012] In the following modalities, user equipment and a base station are disclosed in a radiocommunication system. In the system of Petition 870250097680, dated 10 / 24 / 2025, page 15 / 48 4 / 30 Radiocommunication according to the following modes: the base station allocates radio resources, such as RACH resources, for initial access in a frequency direction and indicates the allocated radio resources to the user equipment. The user equipment uses any of the indicated radio resources to access the base station. For the NR system, a specific scheme for the arrangement of RACH resources has not yet been investigated. In the following modes, one or more RACH bands are allocated, including RACH resources allocated in the frequency direction.

[013] It is desirable to allocate RACH resources in frequency positions available to any user equipment. For example, if RACH resources are allocated independently of an initial active BWP to transmit a downlink signal on initial access (e.g., if RACH resources are allocated outside the initial active BWP), it is possible that the user equipment will not use the allocated RACH resources. Thus, RACH bands can be allocated based on the initial active BWP.

[014] Firstly, referring to FIG. 1, a radio communication system according to an embodiment of the present invention will be described. FIG. 1 is a schematic diagram illustrating a radio communication system according to an embodiment of the present invention.

[015] As illustrated in FIG. 1, a radio communication system 10 includes a base station 100 and user equipment 200. Typically, the radio communication system 10 is an NR system; however, the radio communication system 10 is not limited to this and may be any 3GPP-compliant radio communication system, defined by 3GPP, or may be a non-3GPP-compliant radio communication system.

[016] Base station 100 performs radio communication with various user equipment, including user equipment 200, as Petition 870250097680, dated 10 / 24 / 2025, page 16 / 48 5 / 30 controlled by a higher-level station (not shown) as a main network. In the NR system, base station 100 may be referred to as gNB. In the illustrated embodiment, only base station 100 is shown. However, there are typically several base stations to cover a radio communication system coverage range 10.

[017] User equipment 200 is an information processing device that connects communicatively with base station 100 via a cell. User equipment 200 may be, but is not limited to, a cell phone, a smartphone, a tablet, a wearable device, and the like.

[018] Referring to FIGS. 2 to 10, the allocation of RACH resources and a notification process according to an embodiment of the present invention will be described. FIG. 2 is a block diagram illustrating a functional configuration of the base station according to an embodiment of the present invention.

[019] As illustrated in FIG. 2, base station 100 includes a RACH resource allocation unit 110 and a random access processing (RA) unit 120.

[020] The RACH 110 resource allocation unit allocates a RACH band including RACH resources to which indices are assigned. To be more specific, as illustrated in FIG. 3, the RACH 110 resource allocation unit allocates one or more RACH bands (RACH BWPs) in the frequency direction and allocates RACH resources within a corresponding RACH band of the RACH bands in the frequency direction. Currently, indices (such as 0, 1, and 2) are assigned to the RACH resources allocated in the RACH bands. Petition 870250097680, dated 10 / 24 / 2025, page 17 / 48 6 / 30

[021] The RA 120 processing unit indicates frequency positions of RACH resources to user equipment 200. More specifically, the RA 120 processing unit indicates to user equipment 200 the frequency positions of the respective RACH resources, which have been allocated within the RACH bands by the RACH resource allocation unit 110. The frequency positions of the respective RACH resources in the RACH bands may be broadcast using system information within a cell, may be indicated by radio resource control (RRC) signaling, medium access control (MAC) or downlink control (DCI) information, or may be preliminarily defined by specifications. Additionally, for index assignment, the standards for index assignment may be specified in advance in the specifications and the RA 120 processing unit may indicate an applied index assignment standard.

[022] At the time of initial access, user equipment 200 initiates an RA procedure by selecting any RACH resource from one or more indicated RACH bands and transmitting a 1 message on the selected RACH resource. At this time, user equipment 200, with respect to the RACH resources of one or more indicated RACH bands, may randomly select a RACH resource or may select a RACH resource from a subset of RACH resources extracted based on specific conditions. Alternatively, user equipment 200 may select a RACH resource that is specified by an NW or by base station 100.

[023] In one embodiment, the RACH 110 resource allocation unit can allocate a RACH band based on a band (e.g., an initial active BWP) to transmit a downlink signal in Petition 870250097680, dated 10 / 24 / 2025, page 18 / 48 7 / 30 initial access. More specifically, as illustrated in FIG. 4, the RACH 110 resource allocation unit can allocate RACH resources in the frequency direction in an initial active BWP and can assign indices to the respective RACH resources in the frequency direction. The RA 120 processing unit can indicate to the user equipment 200 the frequency positions of the respective RACH resources in the RACH band allocated by the RACH 110 resource allocation unit.

[024] In one embodiment, the RACH 110 resource allocation unit can allocate a RACH band based on a relatively wide band that includes the band described above (e.g., the initial active BWP) and that has a minimum bandwidth (a minimum UE BW) supported by user equipment 200. More specifically, as illustrated in FIG. 5, the RACH 110 resource allocation unit allocates RACH resources in the frequency direction, within a minimum bandwidth (a minimum UE BW) greater than the initial active BWP and supported by any type of user equipment 200. The RACH 110 resource allocation unit can then assign indices to the respective RACH resources in the frequency direction. The RA 120 processing unit indicates frequency positions of the respective RACH resources from the RACH band allocated by the RACH 110 resource allocation unit.

[025] In the illustrated RACH band allocation, the RACH band corresponding to the minimum UE BW includes all of the initial active BWP; however, the RACH band allocation is not limited to this. The RACH band can be allocated to include a portion of the initial active BWP. Furthermore, in the illustrated RACH band allocation, the center of the RACH band in the frequency direction corresponds to the center of the initial active BWP; however, the RACH band allocation is not limited to this. For example, the end Petition 870250097680, dated 10 / 24 / 2025, page 19 / 48 8 / 30 higher or lower in the frequency direction of the RACH band corresponding to the minimum UE BW may correspond to the upper or lower end of the initial active BWP. Furthermore, the positional relationship described above between the RACH band corresponding to the minimum UE BW and the initial active BWP may be defined by specifications and may be indicated to the user equipment 200.

[026] In one embodiment, the RACH 110 resource allocation unit can allocate one or more RACH bands that have a bandwidth equal to the band described above (e.g., the initial active BWP). More specifically, as illustrated in FIG. 6, the RACH 110 resource allocation unit can allocate RACH resources in the frequency direction, within one or more RACH bands that have a bandwidth equal to the initial active BWP, and can assign indices to the respective RACH resources. The RA 120 processing unit can indicate frequency positions of the respective RACH resources within the one or more RACH bands allocated by the RACH 110 resource allocation unit.

[027] For example, the frequency positions in each of the RACH bands can be indicated based on a deviation from the initial active BWP. Alternatively, the frequency positions can be indicated based on a deviation from a position of a synchronization signal block (SS) or a physical broadcast channel block (PBCH) (hereinafter collectively referred to as an SS block). Alternatively, the frequency positions can be indicated by absolute values ​​or indices assigned within the bandwidth. Alternatively, using an absolute radio frequency channel number (ARFCN), which is used as a reference frequency within the bands, the frequency positions can be indicated or defined by specifications. For example, the processing unit of Petition 870250097680, dated 10 / 24 / 2025, page 20 / 48 9 / 30 RA 120 indicates an ARFCN and, based on a deviation (including 0 deviation) from the indicated ARFCN, frequency positions may be indicated or may be defined by specifications. Exemplary deviations include a deviation only in a high-frequency direction, only in a low-frequency direction, or in the high-frequency or low-frequency direction from a reference position, such as the initial active BWP or the synchronization signal block (SS). Such a deviation may be broadcast in system information, may be indicated by radio resource control (RRC) signaling, medium access control (MAC) signaling, downlink control (DCI) information, or may be defined by specifications. Furthermore, the number of RACH bands in the high-frequency and / or low-frequency directions may be indicated or may be defined by specifications. Additionally, available bandwidths, band positions, and the like may be indicated.

[028] Furthermore, similar to the index assignment to RACH features within a reference BWP, such as the initial active BWP, indices can be assigned to the frequency positions of the respective RACH features in the RACH bands. Namely, within each of the RACH bands, RACH features can be allocated in an individual correspondence with the frequency positions of the RACH features in the initial active BWP.

[029] In addition, the RA processing unit 120 can indicate, among the RACH bands, including the initial active BWP, any one or more RACH bands to the user equipment 200. Note that RACH bands can be indicated in association with SS blocks, which will be described later. Petition 870250097680, dated 10 / 24 / 2025, page 21 / 48 10 / 30

[030] When multiple RACH bands are indicated, user equipment 200, with respect to RACH resources included in all RACH bands, may randomly select a RACH resource, may select a RACH resource from a subset of RACH resources extracted based on specific conditions, or may select a RACH resource specified by NW or base station 100. Alternatively, user equipment 200, with respect to RACH resources included in one or more RACH bands among all indicated RACH bands, may randomly select a RACH resource, may select a RACH resource from a subset of RACH resources extracted based on specific conditions, or may select a RACH resource specified by NW or base station 100. For example, user equipment 200 may select a RACH resource based on capacity information (an UE capacity).To be more specific, user device 200 can select a RACH feature based on a bandwidth supported by user device 200, for example.

[031] In one embodiment, the RACH 110 resource allocation unit can allocate one or more RACH bands that have a bandwidth equal to the relatively wide band described above (minimum UE BW). More specifically, as illustrated in FIG. 7, the RACH 110 resource allocation unit can allocate RACH resources in the frequency direction, within each of the RACH bands larger than the initial active BWP and with a bandwidth equal to the minimum UE BW, and can assign indices to the respective RACH resources in the frequency direction. The RA 120 processing unit can indicate to the user equipment 200, Petition 870250097680, dated 10 / 24 / 2025, page 22 / 48 11 / 30 frequency positions of the respective RACH resources within the RACH bands allocated by the RACH resource allocation unit 110.

[032] For example, frequency positions in each of the RACH bands can be indicated based on a deviation from the minimum UE BW that includes the initial active BWP. Alternatively, frequency positions can be indicated based on a deviation from a position of a synchronization signal block (SS) or a physical broadcast channel block (PBCH). Alternatively, frequency positions can be indicated by absolute values ​​or indices assigned within the bandwidth. Alternatively, using an absolute radio frequency channel number (ARFCN), which is used as a reference frequency within the bands, frequency positions can be indicated or defined by specifications. For example, the RA 120 processing unit indicates an ARFCN and, based on a deviation (including 0 deviation) from the indicated ARFCN, frequency positions can be indicated or defined by specifications.Exemplary deviations include a deviation only in the high-frequency direction, only in the low-frequency direction, or in the high-frequency or low-frequency direction of any RACH band corresponding to the minimum UE BW. Such a deviation may be disseminated by system information, may be indicated by Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, Downlink Control Information (DCI), or may be defined by specifications.

[033] In addition, similar to assigning indices to RACH resources within any reference RACH band corresponding to the minimum UE BW, indices can be assigned to the frequency positions of the respective RACH resources in the RACH bands. Namely, within each Petition 870250097680, dated 10 / 24 / 2025, page 23 / 48 12 / 30 one of the RACH bands, RACH resources can be allocated in individual correspondence with frequency positions of the RACH resources within any reference RACH band corresponding to the minimum UE BW.

[034] In addition, the RA processing unit 120 can indicate, among the RACH bands including the minimum UE BW which includes the initial active BWP, any RACH band or several RACH bands to the user equipment 200. Note that RACH bands can be indicated in association with SS blocks, which will be described later.

[035] Any RACH band corresponding to the minimum UE BW described above may be a minimum UE BW that includes the initial active BWP or may be any other RACH band used as a reference.

[036] When multiple RACH bands are specified, in one embodiment, user equipment 200, with respect to RACH resources included in all RACH bands, may randomly select a RACH resource, may select a RACH resource from a subset of RACH resources extracted based on specific conditions, or may select a RACH resource specified by the NW or base station 100. In another embodiment, user equipment 200, with respect to RACH resources included in one or more RACH bands among all indicated RACH bands, may randomly select a RACH resource, may select a RACH resource from a subset of RACH resources extracted based on specific conditions, or may select a RACH resource specified by the NW or base station 100. For example, user equipment 200 may select a RACH resource based on capacity information (an UE capacity).To be more specific, user equipment 200 can select one. Petition 870250097680, dated 10 / 24 / 2025, page 24 / 48 13 / 30 RACH feature based on a bandwidth supported by the user's equipment, for example, 200.

[037] In one embodiment, the RA processing unit 110 receives a message 1 in an RA procedure from user equipment 200. A frequency position on which message 1 is transmitted may be indicated by a frequency position of a RACH resource within a RACH band or by an entire frequency band in which the RACH resource is allocated. More specifically, as a resource position of message 1 (a random access preamble: RAP) in the frequency direction, included in a random access radio network temporary identifier (RA-RNTI) associated with message 1, only one frequency position of a RACH resource within a RACH band may be included. Namely, it is not necessary to specify which RACH band is used. A cyclic redundancy check (CRC) of the downlink control information (DCI) that schedules a message 2 (random access response: RAR) is scrambled with an RA-RNTI.Upon receiving message 2 or upon receiving control information that scales message 2, in order for user equipment 200 to determine which RACH resource within a RACH band is used to transmit message 1, the RA processing unit 120 can indicate, in an information element included in the RAR, which RACH band is used to transmit message 1. Alternatively, message 2 can be transmitted within the same RACH band used to transmit message 1. Similarly, a message 4 can be transmitted within the same RACH band used to transmit message 1. Alternatively, as a resource position of message 1 in the frequency direction, which is included in an RA-RNTI associated with message 1, all frequency positions. Petition 870250097680, dated 10 / 24 / 2025, page 25 / 48 14 / 30 possibilities in which the RACH resource can be allocated can be included. When an RA-RNTI is calculated, a frequency position in a RACH band and a position of the RACH band can be calculated as separate coefficients.

[038] In one embodiment, the RA processing unit 120 may indicate to the user equipment 200 association information indicating an association between synchronization signal blocks and RACH bands or an association between synchronization signal blocks and RACH resources within RACH bands. The user equipment may select one or more synchronization signal blocks (SS) based on a detected synchronization signal block (SS) and its signal strength and quality, and may use a corresponding RACH resource that can be verified from the association information. By using the association information, the base station may obtain information related to synchronization signal blocks (SS), such as appropriate downlink beams.

[039] More specifically, an association between synchronization signal blocks (SS) and RACH bands can be made as illustrated in FIG. 8, and information indicating the association can be provided to the user equipment 200. In the specific example illustrated, the RACH bands are associated with the respective SS blocks. However, the present invention is not limited to this, and the RACH bands can each be associated with a plurality of SS blocks. When an RA-RNTI is calculated, the SS block indices can be included, or information indicating the RACH bands can be included. Furthermore, for each SS block or for a plurality of SS blocks, the number of associated RACH bands can be indicated. If the number of associated RACH bands is indicated for a plurality of SS blocks, the SS blocks can be distinguished based on Petition 870250097680, dated 10 / 24 / 2025, page 26 / 48 15 / 30 in an association with preamble indices. Furthermore, the number of RACH features, in the frequency direction, associated with one or more SS blocks can be indicated. This is because there is a possibility that RACH features within the same RACH band may be associated with different SS blocks. Additionally, information indicating which SS block is associated with which RACH band or RACH feature can be implicitly indicated according to a relationship between the order of the SS block indices and the order or positions of the RACH bands or RACH features. Alternatively, an association relationship between SS blocks and RACH bands or RACH features can be explicitly indicated.

[040] Alternatively, an association between SS blocks and RACH bands can be made as illustrated in FIG. 9, and information indicating the association can be provided to user equipment 200. In the specific example illustrated, the RACH resource allocation unit 110 can allocate RACH resources associated with the respective SS blocks at specific frequency positions within each RACH band. Namely, the RACH resources associated with all respective SS blocks can be included in each RACH band. For example, an association between SS blocks and frequency positions of RACH resources within only one RACH band can be indicated. Furthermore, when indicating positions and / or the number of RACH bands, a common association relationship between SS blocks and frequency positions of RACH resources within a RACH band can be used.In this case, user equipment 200 can use RACH resources associated with all respective SS blocks by checking the frequency positions of the RACH resources within any RACH band. Additionally, NW or base station 100 can allocate user equipment 200 to each RACH band or can adjust the number of RACH bands. Petition 870250097680, dated 10 / 24 / 2025, page 27 / 48 16 / 30 according to a congestion level. In response to the positions and number of RACH bands being indicated by the NW or base station 100, user equipment 200 can select any RACH resource within the indicated RACH bands.

[041] The association relationship described above between SS blocks and RACH bands or RACH features can be applied to all modalities illustrated in FIGS. 3 to 7. In addition, frequency positions of RACH features, the number of RACH features in the frequency direction and / or intervals between RACH features in the frequency direction can be indicated. Furthermore, among the frequency positions of RACH features, a frequency position of a RACH feature used as a reference can be indicated (the first or last RACH feature, for example). Alternatively, indices or frequency positions of all RACH features can be implicitly indicated. Furthermore, based on the number of RACH features in the frequency direction and / or intervals between RACH features in the frequency direction, the frequency positions of RACH features within a RACH band can be implicitly indicated.For example, RACH resources can be allocated at equal intervals within a RACH band. Furthermore, various patterns can be specified for associations between SS blocks and frequency positions of RACH resources within a RACH band, and an association can be indicated by an index of a corresponding pattern. For example, a pattern can be specified in which RACH resources are allocated at equal intervals, a pattern in which RACH resources are arranged continuously on a high-frequency side, and so on. Any or all positions, the number, and the intervals between RACH resources can be included in these patterns and can be indicated separately. Petition 870250097680, dated 10 / 24 / 2025, page 28 / 48 17 / 30

[042] In addition, the frequency positions of the RACH bands, the number of RACH bands in the frequency direction and / or intervals between RACH bands in the frequency direction may be indicated. Furthermore, among the frequency positions of the RACH bands, a frequency position of a RACH band used as a reference may be indicated (the first or last RACH band, for example). Alternatively, frequency indices or positions of all RACH bands may be implicitly indicated. Furthermore, based on the number of RACH bands in the frequency direction and / or intervals between RACH bands in the frequency direction, the frequency positions of RACH bands within a frequency band may be implicitly indicated. For example, RACH bands may be allocated at equal intervals within a frequency band.Furthermore, various patterns can be specified for associations between SS blocks and RACH band frequency positions within a frequency band, and an association can be indicated by an index of a corresponding pattern. For example, a pattern in which RACH bands are allocated at equal intervals and a pattern in which RACH bands are arranged continuously on a high-frequency side can be specified. Any or all of the positions, the number, and the intervals between RACH bands can be included in these patterns and can be indicated separately.

[043] FIG. 10 is a block diagram illustrating a functional configuration of the user equipment according to a modality. As illustrated in FIG. 10, the user equipment 200 includes a transmitter / receiver 210 and an AR processing unit 220.

[044] Transmitter / receiver 210 transmits / receives a radio signal to / from base station 100. More specifically, the Petition 870250097680, dated 10 / 24 / 2025, page 29 / 48 The 18 / 30 transmitter / receiver 210 transmits / receives various types of downlink signals and / or uplink signals to / from base station 100. For example, downlink signals include a downlink data signal and a downlink control signal, and uplink signals include an uplink data signal and an uplink control signal.

[045] The RA processing unit 220 performs an RA procedure. More specifically, the RA processing unit 220 performs an RA procedure on a RACH resource, which has been selected from among RACH resources included in a RACH band and to which indices are assigned in the frequency direction. At the time of initial access, the processing unit 220 initiates an RA procedure by selecting one or more RACH resources from among RACH resources included in one or more indicated RACH bands and transmitting a message 1 on the selected RACH resource. The RA processing unit 220, with respect to the RACH resources included in one or more indicated RACH bands, may randomly select any RACH resource or may select any RACH resource from a subset of RACH resources that has been extracted based on specific conditions.Alternatively, the RA 220 processing unit can select a RACH feature included in the RACH bands based on a bandwidth supported by the user equipment 200.

[046] The block diagrams used in the above description of the embodiments illustrate blocks of functional units. These functional blocks (components) can be implemented in any arbitrary combination of hardware and / or software items. Furthermore, the means of implementing the functional blocks are not particularly limited. That is, Petition 870250097680, dated 10 / 24 / 2025, page 30 / 48 19 / 30 Functional blocks can be implemented in a physically and / or logically coupled device or in multiple devices where two or more physically and / or logically separate devices are connected directly and / or indirectly (e.g., wired and / or wireless ways).

[047] For example, base station 100 and user equipment 200 according to one embodiment can function as a computer that performs processes related to a radio communication method. FIG. 11 is a block diagram illustrating a hardware configuration of base station 100 and user equipment 200 according to one embodiment. The base station 100 described above and user equipment 200 can each be physically configured as a computer including a processor 1001, memory 1002, storage 1003, communication device 1004, input device 1005, output device 1006 and bus 1007.

[048] In the following description, the term apparatus may be read interchangeably as a circuit, a device, a unit, or the like. The hardware configuration of base station 100 and user equipment 200 may be configured to include one or more of the devices illustrated or to exclude some of the devices.

[049] The functions of base station 100 and user equipment 200 are implemented by having hardware, such as processor 1001 and memory 1002, read predetermined software (a program) in order to allow processor 1001 to perform operations, communicate with communication device 1004 and control the reading and / or writing of data from / in memory 1002 and storage 1003.

[050] Processor 1001 controls the entire computer by running, for example, an operating system. Processor 1001 can be Petition 870250097680, dated 10 / 24 / 2025, page 31 / 48 20 / 30 configured by a central processing unit (CPU), including an interface with a peripheral device, a control device, an arithmetic device, and a register. For example, the components mentioned above can be implemented by the 1001 processor.

[051] In addition, processor 1001 loads programs (program codes), software modules, and data from storage 1003 and / or communication device 1004 into memory 1002 and executes various processes accordingly. Examples of programs include a program to cause the computer to perform at least some of the operations described in the embodiments above. For example, processes performed by the base station components 100 and the user equipment 200 may be implemented by control programs stored in memory 1002 and executed by processor 1001. Other functional blocks may be implemented in a similar manner. Although an example in which various types of processes are performed by the single processor 1001 has been described above, processes may be performed simultaneously or sequentially by two or more processors 1001. Processor 1001 may be implemented with one or more chips.It can be observed that programs can be transmitted from a network via an electrical communication line.

[052] 1002 memory is a computer-readable recording medium and may include at least one of the following, for example: read-only memory (ROM), erasable programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), and random access memory (RAM). 1002 memory may be referred to as a register, a cache, or main memory (a primary storage device). 1002 memory may store, for example, programs (program codes) and Petition 870250097680, dated 10 / 24 / 2025, pp. 32 / 48 21 / 30 software modules that can be run in order to perform the radiocommunication method according to a modality.

[053] Storage 1003 is a computer-readable recording medium and may include at least one of an optical disc, such as a compact disc read-only memory (CD-ROM), a hard disk drive, a floppy disk, a magnetic optical disc (such as a compact disc, a digital versatile disc and a Blu-ray disc (trademark)), a smartcard, flash memory (such as a card, a stick and a key drive), a floppy disk (trademark) and a magnetic strip. Storage 1003 may be referred to as an auxiliary storage device. The recording medium described above may be a database or a server, including memory 1002 and / or storage 1003, or may be any other suitable medium.

[054] The 1004 communication device is a hardware (a transmit / receive device) that performs communication between computers over a wired and / or wireless network and may be referred to as a network device, a network controller, a network card, or a communication module. For example, the components described above may be implemented by the 1004 communication device.

[055] Input device 1005 is an input device (such as a keyboard, mouse, microphone, switch, button, or sensor) that receives inputs from the outside. Output device 1006 is an output device (such as a monitor, speaker, or LED ramp) that provides outputs to the outside. Note that input device 1005 and output device 1006 may be an integrated device (e.g., a touch panel). Petition 870250097680, dated 10 / 24 / 2025, pp. 33 / 48 22 / 30

[056] In addition, devices such as processor 1001 and memory 1002 are connected to each other via bus 1007 which communicates information. Bus 1007 can be a single bus or it can be several different buses for different devices.

[057] In addition, base station 100 and user equipment 200 can be configured to include hardware such as a macro processor, digital signal processor (DSP), application-specific integrated circuit (ASIC), programmable logic device (PLD), and field-programmable gate array (FPGA), and all or parts of the functional blocks can be implemented by the hardware. For example, processor 1001 can include at least one of these hardware devices.

[058] The notification of information is not limited to the aspects / modalities described in the present invention and may be performed in any other manner. For example, information may be indicated through physical layer signaling (e.g., downlink control information (DCI) and uplink control information (UCI)), upper layer signaling (e.g., radio resource control (RRC) signaling, medium access control (MAC) signaling), broadcast information (master information block (MIB) and system information block (SIB)), any other signal, or a combination thereof. Furthermore, RRC signaling may be referred to as an RRC message and may be an RRC connection configuration message or an RRC connection reconfiguration message.

[059] The aspects / modalities disclosed in the present invention can be applied in systems that use LTE (Long Term Evolution), LTE Advanced (LTE-A), SUPER 3G, IMT-Advanced, 4G, 5G, Future Radio Access Petition 870250097680, dated 10 / 24 / 2025, pages 34 / 48 23 / 30 (FRA), W-CDMA (registered trademark), GSM (registered trademark), CDMA 2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, UWB (Ultra Wideband), Bluetooth (registered trademark) or any other appropriate system and / or next-generation systems enhanced by the above systems.

[060] The procedural orders, sequences, and flowcharts of the aspects / modalities described in the present invention may be altered, provided there is no contradiction. For example, in the methods described in the present invention, several steps are presented in an exemplary order and are not limited to a specific order presented.

[061] Certain operations described as being performed by base station 100 may, in some cases, be performed by its superior node. In a network including one or more network nodes with a base station, it is apparent that several operations performed for communication with terminals may be performed by the base station and / or by a network node other than the base station (e.g., a Mobility Management Entity (MME) or a Server Gateway (S-GW) may be assumed, but the network node is not limited to this). Although an example has been described in which a single network node other than the base station is used, multiple other network nodes (e.g., MMEs and S-GWs) may be used in combination.

[062] Information can be transmitted from an upper (or lower) layer to a lower (or upper) layer. Information can also be inserted and transmitted through a plurality of network nodes.

[063] The information that has been entered or issued can be stored in a specific location (such as a memory) or it can be managed in a management table. The information that was Petition 870250097680, dated 10 / 24 / 2025, pages 35 / 48 24 / 30 entries or transmissions can be overwritten, updated, or additionally written. Transmissions can be deleted. Entries can be transmitted to other devices.

[064] The determination can be made with a bit value (0 or 1), a boolean value (true or false) or numerical comparison (comparison with a predetermined value).

[065] The aspects / modalities described in the present invention can be used individually or in combination or can be alternated at the time of implementation. Furthermore, the indication of predetermined information (e.g., indicating that “it is X”) is not limited to an explicit manner and can be carried out in an implicit manner (e.g., the predetermined information is not indicated).

[066] Although the present invention has been described in detail, it will be apparent to those skilled in the art that the present invention is not limited to the embodiments described herein. Various modifications and variations can be made without departing from the scope of the present invention. Therefore, the description in the present invention aims to describe embodiments and is not intended to have any restrictive meaning for the present invention.

[067] Software should be broadly understood as an instruction, a set of instructions, a code, a code segment, a program code, a program, a subprogram, a software module, an application, a software application, a software package, a routine, a subroutine, an object, an executable file, a thread, a procedure, or a function, regardless of whether it is designated as software, firmware, middleware, microcode, hardware description language, or any other name. Petition 870250097680, dated 10 / 24 / 2025, pp. 36 / 48 25 / 30

[068] In addition, software, instructions and the like may be transmitted and received through a transmission medium. For example, if software is transmitted from a site, server or other remote sources using wired techniques such as coaxial cable, fiber optic cable, twisted pair cable and digital subscriber line (DSL) and / or wireless techniques such as infrared, radio and microwave; such wired and / or wireless techniques are included in the definition of a transmission medium.

[069] Information, signals and the like, as described in the present invention, can be represented using any of several different techniques. For example, data, an instruction, a command, information, a signal, a bit, a symbol and a chip that can be referenced by the entire description above, can be represented by a voltage, current, electromagnetic wave, magnetic field, magnetic particle, optical field, photon or any combination thereof.

[070] The terms described in the present invention and / or the terms necessary to understand the present descriptive report may be replaced by terms with the same or similar meanings. For example, a channel and / or a symbol may be a signal. In addition, the signal may be a message. Furthermore, a component carrier (CC) may be referred to as a carrier frequency or a cell, for example.

[071] As used in the present invention, the terms system and network are used interchangeably.

[072] Furthermore, information, parameters and the like, as described in the present invention, may be represented as absolute values, relative values ​​derived from predetermined values ​​or other corresponding information. For example, a radio feature may be specified by an index. Petition 870250097680, dated 10 / 24 / 2025, pp. 37 / 48 26 / 30

[073] The names used for the parameters described above are not intended to be restrictive in any way. Furthermore, there may be a case in which the formulas using these parameters may differ from those explicitly disclosed in the present invention. Various channels (such as PUCCH and PDCCH) and information elements (such as TPC) may be identified by any name, and the names assigned to these various channels and information elements are not intended to be restrictive in any way.

[074] A base station may accommodate one or more (three, for example) cells (also referred to as sectors). If the base station accommodates multiple cells, the entire coverage area of ​​the base station may be segmented into multiple smaller areas, and each of the smaller areas may provide a communication service using a base station subsystem (such as a remote radio head (RRH), which is a small, internal base station). The term cell or sector refers to all or part of the coverage area of ​​a base station and / or a base station subsystem providing a communication service within that coverage. In addition, the terms base station, eNB, cell, and sector may be used interchangeably in this document. The base station may also be referred to as a fixed station, NodeB, eNodeB (eNB), access point, femtocell, or small cell.

[075] The mobile station may 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, Petition 870250097680, dated 10 / 24 / 2025, pages 38 / 48 27 / 30 handset, user agent, mobile client, client, or some other suitable term.

[076] As used in the present invention, the term determination may include various operations. For example, the term determination may include determining whether calculation, computation, processing, derivation, investigation, search (e.g., searching in a table, database, or any other data structure), or verification is performed. Furthermore, the term determination may include determining whether reception (e.g., receiving information), transmission (e.g., transmitting information), input, output, or access (e.g., accessing data in a memory) is performed. Additionally, the term determination may include determining whether resolution, selection, choice, establishment, or comparison is performed. Namely, determination may include determining whether any operation is performed.

[077] The terms connected, coupled, and any variation thereof mean direct or indirect connection or coupling between two or more elements and may include one or more intermediate elements existing between two mutually connected or coupled elements. The coupling or connection between elements may be physical, logical, or a combination thereof. As used in the present invention, two elements may be considered mutually connected or coupled to each other using one or more electrical wires, cables, and / or printed electrical connections and, as various non-limiting and non-comprehensive examples, using electromagnetic energy, such as electromagnetic energy with wavelengths in the radio frequency region, microwave regions, and light regions (both visible and invisible). Petition 870250097680, dated 10 / 24 / 2025, pp. 39 / 48 28 / 30

[078] A reference sign may be abbreviated as RS and may be designated as a pilot according to the standards applied.

[079] As used in the present invention, the term based on does not mean based only on, unless otherwise indicated. That is, the term based on means both based only on and based on at least.

[080] Any reference to elements using terms such as first and second used in the present invention does not limit the quantity or order of these elements in general. These terms may be used in the present invention in order to conveniently distinguish two or more elements. Therefore, reference to the first and second element does not mean that only the two elements are employed or that the first element is necessarily preceding the second element in any way.

[081] The term medium used in the configuration of each device, as described above, may be replaced by unit, circuit, device or similar.

[082] Since the terms include, including and any variation thereof are used in this descriptive report or in the claims, these terms shall be inclusive in a manner similar to the term comprising. Furthermore, the term or used in this descriptive report or in the claims is not intended to be “or” in an exclusive manner.

[083] A radio frame can be configured by one or more frames in the time domain. In the time domain, the one or more frames can be referred to as subframes. Furthermore, subframes can be configured by one or more slots in the time domain. In addition, slots can be configured by one or more symbols (such as OFDM symbols and Petition 870250097680, dated 10 / 24 / 2025, pages 40 / 48 29 / 30 SC-FDMA symbols) in the time domain. Such a radio frame, subframe, slot, and symbol each represent a unit of time for transmitting a signal. The radio frame, subframe, slot, and symbol may be referred to by another name. For example, in an LTE system, a base station schedules the allocation of radio resources (such as frequency bandwidths and transmission power available to each mobile station) for each of the mobile stations. The minimum unit of time for scheduling may be referred to as the transmission time interval (TTI). For example, a subframe, several successive subframes, or a slot may be referred to as a TTI. A resource block (RB) may be a unit of resource allocation in both a time domain and a frequency domain and may include one or more consecutive subcarriers in the frequency domain.Furthermore, in the time domain, the feature block may include one or more symbols and may have a slot, subframe, or TTI length. A TTI and a subframe may each be configured by one or more feature blocks. The radio frame configuration described above is merely illustrative, and the number of subframes included in a radio frame, the number of slots included in a subframe, the number of symbols and feature blocks included in a slot, and the number of subcarriers included in a feature block may be altered in any way.

[084] Although embodiments of the present invention have been described in detail, the present invention is not limited to the embodiments described above. Many variations and modifications can be made without departing from the scope of the present invention described in the claims. LIST OF REFERENCE SYMBOLS: Radio communication system Petition 870250097680, dated 10 / 24 / 2025, pp. 41 / 48 30 / 30 100 Base Station 200 User Equipment Petition 870250097680, dated 10 / 24 / 2025, pages 42 / 48

Claims

1 / 5 CLAIMS 1. Terminal (200) characterized in that it comprises: a receiving unit (210) configured to receive, from a base station device (100), RRC signaling including, for each BWP, information on one or more frequency positions of one or more RACH resources and information on a number of one or more RACH resources in a frequency direction; a processing unit (220) configured to identify, based on the RRC signaling, a RACH resource to transmit a random access preamble; and a transmitting unit configured to transmit the random access preamble to the base station device (100), wherein, for the one or more RACH resources in each BWP, one or more assignments are numbered in the frequency direction based on the number among the one or more RACH resources in the frequency direction, wherein the receiving unit (210) is configured to receive, for each of a plurality of BWPs,information indicating an association between a RACH resource and a synchronization signal block, wherein the information indicating the association is included in the RRC signaling, wherein assignments of the synchronization signal blocks, the assignments being received by the receiving unit (210), are mapped to the RACH resources located in the frequency direction based on the information indicating the association, and wherein the processing unit (220) extracts a subset from among one or more RACH resources based on an assignment from among the assignments of the synchronization signal blocks, and the processor selects, from the subsets extracted from among one or more RACH resources, a RACH resource that is specified by the base station apparatus as the RACH resource to transmit the random access preamble.

2. Terminal (200), according to claim 1, characterized in that the information about one or more frequency positions of one or more RACH resources indicates a frequency position of a RACH resource that is a reference.

3. Terminal (200), according to claim 1 or 2, characterized in that the receiving unit (210) is configured to receive a response to the random access preamble based on an RA-RNTI that is associated with a frequency position of the RACH resource in the BWP to which the random access preamble is mapped.

4. Terminal (200), according to any one of claims 1 to 3, characterized in that the receiving unit (210) is configured to receive RRC signaling corresponding to each of a plurality of BWPs including a first BWP for initial access, and in that the processing unit (220) is configured to determine a BWP to transmit the random access preamble from the plurality of BWPs based on the first BWP.

5. Terminal (200), according to claim 4, characterized in that the BWP for transmitting the random access preamble is the first BWP for initial access.

6. Terminal (200), according to any one of claims 1 to 5, characterized in that the receiving unit (210) is configured to receive the RRC signaling corresponding to each of a plurality of BWPs including a first BWP for initial access, and in which, by the RRC signaling, one or more BWPs are configured, each having a bandwidth that is the same as that of the first BWP.

7. Terminal (200), according to any one of claims 1 to 6, characterized in that the receiving unit (210) is configured to receive RRC signaling corresponding to each of a plurality of BWPs including a first BWP for initial access, and in which, by RRC signaling, one or more BWPs are configured, each having a bandwidth that differs from that of the first BWP.

8. Terminal (200), according to any one of claims 1 to 7, characterized in that the receiving unit (210) is configured to receive RRC signaling corresponding to each of a plurality of BWPs including a first BWP for initial access, and in which, by RRC signaling, one or more BWPs are configured, each having a bandwidth including the first BWP.

9. Method by a terminal (200), the method characterized in that it comprises: a step of receiving, from a base station device (100), RRC signaling including, for each BWP, information on one or more frequency positions of one or more RACH resources and information on a number of one or more RACH resources in a frequency direction; a step of identifying, based on the RRC signaling, a RACH resource to transmit a random access preamble; and a step of transmitting the random access preamble to the base station device (100) wherein, for the one or more RACH resources in each BWP, one or more assignments are numbered in the frequency direction based on the number among the one or more RACH resources in the frequency direction, wherein the receiving step receives, for each among a plurality Petition 870250097680, of 10 / 24 / 2025, p.45 / 48 4 / 5 of BWPs, information indicating association between a RACH resource and a synchronization signal block, wherein the information indicating the association is included in the RRC signaling, wherein the assignments of the synchronization signal blocks, the assignments being received by the receive stage, are mapped to the RACH resources located in the frequency direction based on the information indicating the association, and wherein the terminal extracts a subset from among one or more RACH resources based on an assignment from among the assignments of the synchronization signal blocks, and the terminal selects, from the subsets extracted from among one or more RACH resources, a RACH resource that is specified by the base station device, as the RACH resource to transmit the random access preamble.

10. Base station apparatus (100) characterized in that it comprises: a transmitting unit configured to transmit RRC signaling including, for each BWP, information about one or more frequency positions of one or more RACH resources and information about a number of one or more RACH resources in a frequency direction; and a receiving unit configured to receive, from a terminal (200), a random access preamble that is transmitted on a RACH resource identified by the terminal (200) based on the RRC signaling, wherein, for the one or more RACH resources in each BWP, one or more assignments are numbered in the frequency direction based on the number among the one or more RACH resources in the frequency direction, wherein the transmitting unit is configured to transmit, for each Petition 870250097680, of 10 / 24 / 2025, p.46 / 48 5 / 5 one among a plurality of BWPs, information indicating association between a RACH resource and a synchronization signal block, wherein the information indicating the association is included in the RRC signaling, wherein assignments of the synchronization signal blocks, the assignments being transmitted by the transmission unit, are mapped to the RACH resource located in the frequency direction based on the information indicating the association, and wherein the base station device (100) assumes that the terminal extracts a subset from among one or more RACH resources based on an assignment from among the assignments of the synchronization signal blocks, and the terminal selects, from the subsets extracted from among one or more RACH resources, a RACH resource that is specified by the base station device as the RACH resource to transmit the random access preamble. Petition 870250097680, dated 10 / 24 / 2025, pp. 47 / 48.

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