Terminal and communication method

Abstract

This terminal comprises: a control unit that configures a random access channel opportunity for transmitting a random access channel; and a transmission unit that transmits the random access channel on the basis of the configured random access channel opportunity. The random access channel opportunity is configured so that the number of random access channel opportunities multiplexed in the frequency direction at a first position in the time direction is different from the number of random access channels multiplexed at a second position in the time direction.

Description

Terminal and communication method

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

[0002] For NR (New Radio) (also known as "5G"), the successor system to LTE (Long Term Evolution), technologies are being considered that satisfy the requirements of 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 (for example, Non-Patent Document 1).

[0003] Furthermore, in Release 18 of 3GPP (registered trademark), network energy savings has become increasingly important in order to achieve environmental sustainability, carbon neutrality, SDGs (Sustainable Development Goals), reduced operating costs, etc., and methods for saving energy are being considered (e.g., Non-Patent Document 2).

[0004] In order to reduce network power consumption, dynamic control of SSB (SS / PBCH block) transmission opportunities in NES (Network energy savings) mode is being considered, so that network transmission modules (e.g., base stations) can be put to sleep in a detailed and flexible manner.

[0005] 3GPP TS 38.300 V18.0.0 (2023-12)"New WID: Network energy savings for NR", RP-223540, 3GPP TSG RAN Meeting #98-e, December 20223GPP TR 38.822 V17.1.0 (2023-06)3GPP TS 38.331 V17.6.0 (2023-09)

[0006] However, it was not clear how to associate RACH occasions (ROs) corresponding to SSB transmissions in the dynamic adaptation of SSB transmission opportunities. Furthermore, due to the dynamic adaptation of SSB transmission opportunities, there is a risk that terminals will concentrate in an area of ​​a specific SSB beam (i.e., SSB index), resulting in an increase in PRACH transmissions in the ROs associated with this specific SSB beam, while no transmissions will be performed in other ROs.

[0007] The terminal in this embodiment includes a control unit that sets a random access channel opportunity for transmitting a random access channel, and a transmission unit that transmits the random access channel based on the set random access channel opportunity, and the random access channel opportunities are set so that the number of random access channel opportunities multiplexed in the frequency direction at a first position in the time direction is different from the number of random access channels multiplexed at a second position in the time direction.

[0008] According to this embodiment, in a wireless communication system, it is possible to flexibly associate ROs corresponding to SSBs.

[0009] 10 is a diagram for explaining a wireless communication system according to the present embodiment. A diagram for explaining an example of an initial access procedure between a UE and a gNB. A diagram for explaining an example of the configuration of SSB in NR. A diagram for explaining RACH occasion (RO) configuration. A diagram for explaining RO configuration. A diagram for explaining an example of an information element of RACH-ConfigCommon included in SIB1. A diagram for explaining an information element of RACH-ConfigGeneric included in SIB1. A diagram for explaining a conventional RO configuration. A diagram for explaining a conventional RO configuration. A diagram for explaining an example of a frequency direction configuration of RO in the first embodiment. A diagram for explaining an example of a frequency direction configuration of RO in the first embodiment. A diagram for explaining an example of an RO configuration in the second embodiment. A diagram for explaining an example of an RO configuration in the second embodiment. A diagram for explaining an example of an RO configuration in the second embodiment. A diagram for explaining an example of a procedure executed by a terminal according to the third embodiment. A sequence diagram showing an example of a procedure between a terminal and a base station according to the fifth embodiment. A sequence diagram showing an example of a procedure between a terminal and a base station according to the seventh embodiment. A diagram for explaining an example of the functional configuration of a base station according to the present embodiment. A diagram for explaining an example of the functional configuration of a terminal according to the present embodiment. A diagram for explaining an example of the hardware configuration of a base station or a terminal according to the present embodiment. A diagram for explaining an example of the configuration of a vehicle according to the present embodiment.

[0010] Hereinafter, the present embodiment will be described with reference to the drawings. Note that one or more embodiments described below are examples, and the embodiments to which the present invention is applied are not limited to the following embodiments.

[0011] In the operation of the wireless communication system of this embodiment, existing technology may be used as appropriate. The existing technology is, for example, existing NR or LTE, but is not limited to existing NR or LTE. In addition, the term "LTE" used in this specification has a broad meaning including LTE-Advanced and systems after LTE-Advanced (e.g., NR), unless otherwise specified.

[0012] In addition, in the present embodiment described below, terms 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) used in existing LTE are used. This is for convenience of description, and similar signals, functions, etc. may be called by other names. In addition, the above-mentioned terms in NR correspond to NR-SS, NR-PSS, NR-SSS, NR-PBCH, NR-PRACH, etc. However, even if a signal is used in NR, it is not necessarily stated as "NR-".

[0013] In addition, in this embodiment, the duplex method may be a time division duplex (TDD) method, a frequency division duplex (FDD) method, or another method (for example, flexible duplex, etc.).

[0014] Furthermore, in this embodiment, "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.

[0015] (System Configuration) Fig. 1 is a diagram for explaining a wireless communication system according to this embodiment. As shown in Fig. 1, the wireless communication system according to this embodiment 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.

[0016] 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 transmission time interval (TTI) in the time domain may be a slot, or a subframe.

[0017] 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 NR-PBCH and is also referred to as broadcast information. The synchronization signal and system information may also be referred to as 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 the DL or UL. Furthermore, both the base station 10 and the terminal 20 may communicate via a secondary cell (SCell: Secondary Cell) and a primary cell (PCell: Primary Cell) using CA (Carrier Aggregation). 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).

[0018] 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 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.

[0019] 2 is a diagram illustrating an example of an initial access procedure between a UE and a gNB. In the initial access procedure, the following steps are performed:

[0020] 1) PSS detection: Time and frequency synchronization, Part of physical cell ID 2) SSS detection: Part of physical cell ID 3) PBCH-DMRS detection: (Part of) SSB index within 5 ms half radio frame 4) PBCH reading: SFN number and radio frame timing (SSB index) Configuration information for RMSI reading: Whether UE can camp on the cell (carrier) or not 5) PDCCH reception -> SIB1: PDSCH information of cell configuration and initial access (e.g., PRACH configuration) 6) PRACH (Msg1) transmission: First transmit signal for initial access procedure 7) Reception of PDCCH -> Msg2: PDSCH (RAR: Random access response) TA (timing advance), TC-RNTI, and Msg3: scheduling (RAR UL grant) 8) Msg3: PUSCH transmission: RRC setup request (including UE ID) 9) PDCCH reception -> Msg4: PDCSH Contention resolution: TC-RNTI -> C-RNTI

[0021] 3 is a diagram showing an example of the configuration of an SSB in NR. The SSB is an example of a synchronization signal block.

[0022] The bandwidth of the SSB is 20 RBs, and the number of symbols is 4. The bandwidth of the LTE SS / PBCH is 6 RBs, and the number of symbols is 6. Thus, the bandwidth of the SSB is wider than that of the LTE SS / PBCH, and the number of symbols of the SSB is fewer than that of the LTE SS / PBCH.

[0023] The LTE SS / PBCH transmission period is fixed to 5 / 10 ms, while the SSB transmission period can be flexibly set to 5, 10, 20, 40, 80, or 160 ms.

[0024] The LTE SS / PBCH symbol position is a fixed single position, while the SSB symbol has multiple candidate symbol positions within a 5 ms half radio frame: 4, 8, and 64 fixed positions for the SSB symbol positions in the frequency ranges 0-3, 3-6, and 6-52.6 GHz, respectively.

[0025] 4A is a diagram showing an example of PRACH occasion configuration when the PRACH config. index is 0. FIG. 4B is a diagram showing an example of PRACH occasion configuration when the PRACH config. index is 89.

[0026] The association between the SSB index and the RO (SSB index-RACH occasion association) is configured using RRC parameters included in SIB 1. Fig. 5A is a diagram showing an example of information elements of RACH-ConfigCommon included in SIB 1. Fig. 5B is a diagram showing an example of information elements of RACH-ConfigGeneric included in SIB 1. Figs. 5C and 5D are diagrams showing configuration examples of RACH occasions (RO).

[0027] "ssb-perRACH-OccasionAndCB-PreamblesPerSSB" included in RACH-ConfigCommon in FIG. 5A indicates the number of SSBs associated with one RO and the number of preamble indexes associated with one SSB.

[0028] "msg1-FDM" included in RACH-ConfigGeneric in FIG. 5B indicates the number of ROs allocated in the frequency domain (i.e., at the same position in the time domain).

[0029] 5C shows an example of RO configuration when ssb-perRACH-OccasionAndCB-PreamblesPerSSB in RACH-ConfigCommon is set to "two" and msg1-FDM in RACH-ConfigGeneric is set to "one." In the example of FIG. 5C, two SSBs are associated with each RO, and one RO is assigned to the frequency domain.

[0030] 5D shows an example of RO configuration when ssb-perRACH-OccasionAndCB-PreamblesPerSSB in RACH-ConfigCommon is set to "oneHalf" and msg1-FDM in RACH-ConfigGeneric is set to "two." In the example of FIG. 5D, 0.5 (one half) SSB is associated with each RO, and two ROs are allocated in the frequency domain.

[0031] In order to reduce network power consumption, dynamic control of SSB transmission opportunities in NES mode is being considered so that network transmission modules (e.g., base stations) can be put to sleep in a fine-grained and flexible manner.

[0032] The association of the SSB index with the RACH occasion is configured by the RRC parameters under SIB1. To update these RRC parameters, it is necessary to change the contents of SIB1. It may be necessary to notify the terminal (UE) in RRC connection of the change by RRCReconfiguration.

[0033] However, in the past, it was not clear how to associate ROs corresponding to SSB transmission opportunities in dynamic adaptation of SSB transmission opportunities. Furthermore, dynamic adaptation of SSB transmission opportunities may cause terminals to concentrate in an area of ​​a specific SSB beam (i.e., SSB index), which may result in many PRACH transmissions in the RACH occasions associated with this specific SSB beam, while no transmissions may be performed in other RACH occasions.

[0034] According to this embodiment, it is possible to appropriately associate ROs corresponding to SSBs in consideration of dynamic adaptation of SSB transmission opportunities.

[0035] Each example in the present embodiment described below may be executed independently, or any of the examples may be executed in combination.

[0036] (First Example) Conventionally, as shown in Figures 5C and 5D, it was only possible to set the number of ROs in the frequency direction to be the same in the time direction. According to the first example, different values ​​may be set in the time direction for the frequency direction setting of ROs. That is, for example, the number of ROs multiplexed in the frequency direction at the same position in the time direction (first position) may be set to be different from the number of ROs multiplexed at another same position in the time direction (second position). The frequency direction setting of ROs may be set, for example, by a parameter specifying the number of ROs that are at the same position in the time direction and can have different settings multiplexed in the frequency direction. The parameter in this example may be a new parameter, or a parameter obtained by extending or modifying the conventional msg1-FDM may be used.

[0037] As shown in FIGS. 6A and 6B, the number of ROs multiplexed in the time direction is set to be different from the number of ROs multiplexed in the frequency direction.

[0038] In the example of Figure 6A, one RO #0 is set in the first time unit, two ROs #1 and #2 are set in the second time unit, one RO #3 is set in the third time unit, and two ROs #4 and #5 are set in the fourth time unit.

[0039] In the example of FIG. 6B, four ROs #0-#3 are set in the first time unit, and one RO #4 is set in the second time unit.

[0040] The time unit for which different values ​​can be set may be a symbol, RO (a number of symbols determined from the number of time-domain PRACH occasions in a PRACH slot and the PRACH duration), slot, radio frame, submsec, msec, or sec.

[0041] The setting of the frequency direction of the RO (i.e., the number of ROs multiplexed in the frequency direction at the same position in the time direction) may be selected from {one, two, four, eight}. However, the value used for setting the frequency direction of the RO is not limited to these and may be any value.

[0042] A predetermined relationship and / or limitation may be set between the number of ROs in the time direction and the frequency direction. For example, the predetermined relationship may be "if there are X ROs in the time direction, only X types of numbers can be set in the frequency direction" or "only a number that is one smaller or larger than the number candidate of the next or previous RO in the time direction can be set in the frequency direction."

[0043] As a method for setting the number of ROs in the frequency direction in the first embodiment, different numbers of ROs in the frequency direction may be set in a certain time unit. As another setting method, the number of ROs in the frequency direction may be set by combining a plurality of RO configurations (e.g., RACH-ConfigCommon / RACH-ConfigGeneric) as a set.

[0044] In this way, according to the first embodiment, the number of ROs multiplexed in the frequency direction at the same position in the time direction (first position) may be set to be different from the number of ROs multiplexed in another same position in the time direction (second position). Furthermore, according to the first embodiment, the terminal 20 may receive from the base station 10 configuration information indicating the number of different frequency-direction ROs for each position in the time direction, and configure the ROs based on the configuration information.

[0045] According to the first embodiment, the terminal 20 can appropriately perform RO setting taking into consideration dynamic adaptation of SSB transmission opportunities.

[0046] Second Embodiment According to a second embodiment, the number of SSBs (SSB indexes) associated with one RO may be set to a different value for each RO.

[0047] In the example of FIG. 7A, the number of SSBs associated with each of RO#0, RO#1, RO#2, and RO#3 is two.

[0048] In the example of Figure 7B, two SSBs with SSB indexes 0-1 are associated with RO#0, four SSBs with SSB indexes 2-4 are associated with RO#1 and RO#2, two SSBs with SSB indexes 6-7 are associated with RO#3, and four SSBs with SSB indexes 8-11 are associated with RO#4 and RO#5.

[0049] In the example of Figure 7C, two SSBs with SSB indexes 0-1 are associated with RO #0, two SSBs with SSB indexes 2-3 are associated with RO #1, three SSBs with SSB indexes 4-6 are associated with RO #2, two SSBs with SSB indexes 7-8 are associated with RO #3, and four SSBs with SSB indexes 9-11 are associated with RO #4 and RO #5.

[0050] The configuration of SSBs associated with ROs in the second embodiment may be applied only when the configuration of the number of ROs in the frequency direction in the first embodiment is performed simultaneously. The configuration in the second embodiment may be applied only when the configuration is not performed simultaneously with the configuration in the first embodiment. As another example, the configuration in the second embodiment may be performed independently of the configuration in the first embodiment.

[0051] A value relating to a different SSB (SSB index) may be set for each different RO in the frequency direction in a predetermined time unit.

[0052] A different value related to the SSB (SSB index) may be set for each RO that differs in the time direction in a predetermined time unit.

[0053] The predetermined time unit may be a symbol, an RO (a plurality of symbols determined from the number of time-domain PRACH occasions in a PRACH slot and the PRACH duration), a slot, a radio frame, submsec, msec, or sec.

[0054] In the second embodiment, the setting of associating an RO with an SSB may be performed by setting a predetermined value for the associated SSB in a predetermined time unit. The setting in the second embodiment may be performed by setting a predetermined value for the associated SSB for a certain RO. The setting in the second embodiment may be performed by setting a predetermined value for the associated SSB for a certain RO set (e.g., a plurality of ROs having the same number of ROs in the frequency direction). As another example, the setting in the second embodiment may be performed by any combination of the setting methods described above.

[0055] In the second embodiment, the predetermined value related to the SSB associated with the RO may be the number of SSB indices, a range of SSB indices, a list of SSB indices, or an SSB position.

[0056] Thus, according to the second embodiment, the number of SSB indexes associated with an RO (first RO) may be set to be different from the number of SSB indexes associated with another RO (second RO). Furthermore, according to the second embodiment, the terminal 20 may receive from the base station 10 configuration information indicating the number of SSB indexes associated with an RO for each position in the time direction or the number of SSB indexes associated with an RO for each RO, and associate an SSB index with each RO based on the configuration information.

[0057] According to the second embodiment, it is possible to appropriately associate ROs with SSBs in consideration of dynamic adaptation of SSB transmission opportunities.

[0058] (Third Example) According to a third example, regarding the linking (association) between SSBs and ROs, a predetermined value (for example, the product thereof) (defined as (value 1)) calculated from the "(total) number of SSBs (SSB indexes) per configured RO" and the "number of configured ROs" may be different from the "number of configured / actually transmitted SSBs (SSB indexes)" (defined as (value 2)). When (value 1) and (value 2) are different values, the terminal 20 may apply the predetermined linking.

[0059] 8 is a diagram showing an example of a procedure executed by the terminal 20 in the third embodiment. As shown in FIG. 8, in step S101, the terminal 20 determines whether the above (value 1) and (value 2) are different values. In step S102, if the (value 1) and (value 2) are different values, the terminal 20 applies a predetermined association.

[0060] The predetermined association in the third embodiment may be the setting of an SSB (SSB index) associated with the RO in the second embodiment.

[0061] The number of SSBs (SSB indexes) may be, for example, a value determined from the following parameters / UE measurements: The parameter for determining the number of SSBs (SSB indexes) is Ssb-positionsInBurst or the number of SSB measurement values ​​at SSB positions that are equal to or greater than a predetermined value.

[0062] The number of ROs may be a value determined from the following parameters, for example: the number of time domain PRACH occasions within a PRACH slot, the starting symbol, the number of PRACH slots, the PRACH duration, the PRACH format, and the PRACH configuration index.

[0063] In the third embodiment, the predetermined linking may be, for example, when (value 1) is greater than (value 2), "the setting of (value 1) may be ignored and (value 2) may be allocated forward or backward in the time direction," or "the setting of (value 1) may be ignored and (value 2) may be allocated to ROs by forwarding in the time direction so that the RO / SSB index (number of ROs per SSB index) becomes a uniform or nearly uniform value."

[0064] In the third embodiment, the predetermined linking is, for example, when (value 1) is smaller than (value 2), "the setting of (value 1) may be ignored, and SSBs (SSB indexes) of (value 2) may be allocated to ROs by moving forward in the time direction so that the RO / SSB index is as uniform as possible," or "SSBs (SSB indexes) that are earlier or later in the time direction than (value 2) and that exceed (value 1) may not be allocated to ROs."

[0065] In the third embodiment, for example, when the difference between (value 1) and (value 2) is equal to or greater than a predetermined value, the predetermined association is determined to be invalid, and the terminal may perform a predetermined operation (for example, always transmitting a PRACH in RO #1, transmitting a request signal for association change to the network (for example, base station 10), or not performing camp on / initial access to the cell). Even when (value 1) and (value 2) are different, the terminal 20 may perform the predetermined operation described above.

[0066] (Fourth Example) According to a fourth example, for a valid RO that can be used by the terminal 20, in addition to existing RO parameters (e.g., RACH-ConfigCommon / RACH-ConfigGeneric), a setting may be made to apply (mask) valid or invalid parameters.

[0067] (Fifth Example) Multiple RO patterns may be configured (for NES) as new parameters of SIB1, and in addition to one existing RO configuration (e.g., RACH-ConfigCommon / ), multiple ROs may be configured for a terminal 20 that supports a subsequent release of NES (e.g., Release 19 NES UE), and each RO pattern may include a configuration in which the association between SSB index and RO in the above-mentioned example is extended.

[0068] 9 is a sequence diagram showing an example of a procedure between the terminal 20 and the base station 10 in the fifth embodiment. As shown in FIG. 9, in step S11, the base station 10 transmits SIB1 including a plurality of RO patterns as new parameters. In step S12, the terminal 20 transmits PRACH to the base station 10.

[0069] When multiple RACH occasions are configured, the terminal 20 compatible with a later release of NES may ignore one existing RO configuration and refer only to the new RO to perform a predetermined operation.

[0070] An identifier may be set for each pattern, and the identifier may be notified to the terminal 20 to determine the pattern to be used.

[0071] The identifiers may be associated implicitly by the order of a list configured in the RRC, or may be associated by explicitly configuring a certain number.

[0072] For example, SIB1 may include parameters for NR-19 NES including RACH-ConfigCommon #2 in addition to existing parameters including RACH-ConfigCommon #1.

[0073] A plurality of RO patterns may be managed by RRC by setting them as "addmodlist" and / or "releaselist" to set them in the terminal 20.

[0074] (Sixth embodiment) A plurality of RO patterns can be further set as a plurality of sets, and an identifier may be set for each set, and the set to be used may be specified by notifying the identifier. The RO patterns included in the set may be specified / determined by setting the identifiers.

[0075] Seventh Embodiment For each RO pattern, ON / OFF (activation / deactivation) of the RO pattern may be notified by UE-specific signaling and / or UE-common signaling.

[0076] 10 is a sequence diagram showing an example of a procedure between the terminal 20 and the base station 10 in the seventh embodiment. As shown in FIG. 10, in step S20, the base station 10 transmits UE-specific signaling and / or UE-common signaling including ON / OFF (activation / deactivation) of an RO pattern. In step S21, the base station 10 transmits SIB1. In step S22, the terminal 20 transmits a PRACH to the base station 10.

[0077] When the RO pattern is ON (activation), the time settings (period / offset / duration) associated with the RO pattern may be applied. When the RO pattern is OFF (deactivation), the time settings (period / offset / duration) associated with the RO pattern may not be applied.

[0078] When the RO pattern is ON (activation), the (additionally configured / identifier-informed / UE-selected) RO pattern may be applied. When the RO pattern is OFF (deactivation), the (additionally configured / identifier-informed / UE-selected) RO pattern may not be applied, and the existing (Release 15) RO configuration may be applied.

[0079] (Eighth Example) The above-mentioned setting / notification related to RO may be set under the control of SI / SIB, or may be set by a UE-specific RRC signal (e.g., RRCReconfiguration) for terminal 20 during RRC connection.

[0080] (Ninth embodiment) The predetermined parameters related to the beam applied to a certain SSB (SSB index) may be changed without notifying the terminal, and at certain intervals, the terminal 20 may assume a change in the beam and (re)execute predetermined operations related to RRM, may execute predetermined operations related to L1 measurement and L3 measurement, or may assume predetermined operations related to the receiving beam assumed in QCL type D.

[0081] For example, the terminal 20 may (re)execute the above-described operations assuming that the relationship between the SSB index and the beam changes every SSB and / or SIB1 period *X seconds. For example, the terminal may perform PRACH.

[0082] (Device Configuration) Next, a functional configuration example of the base station 10 and the terminal 20 that execute the processes and operations described above will be described. 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 proposed functions of any of the embodiments.

[0083] <Base Station 10> Fig. 11 is a diagram showing an example of the functional configuration of a base station. As shown in Fig. 11, 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. 11 is merely an example. As long as the operation according to this embodiment can be performed, the names of the functional divisions and functional units may be any. The transmitting unit 110 and the receiving unit 120 may be called a communication unit.

[0084] 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.

[0085] 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. The transmitting unit 110 and the receiving unit 120 may also be called a transmitter and a receiver, respectively.

[0086] <Terminal 20> Fig. 12 is a diagram showing an example of the functional configuration of a terminal. As shown in Fig. 12, the 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. 12 is merely an example. As long as the operation according to this embodiment can be executed, 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.

[0087] 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.

[0088] 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 function unit related to signal transmission in the control unit 240 may be included in the transmitting unit 210, and the function 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.

[0089] 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.

[0090] <Configuration related to this embodiment> (Item 1) A terminal comprising: a control unit that sets a random access channel opportunity for transmitting a random access channel; and a transmission unit that transmits the random access channel based on the set random access channel opportunity, wherein the random access channel opportunities are set so that the number of random access channel opportunities multiplexed in the frequency direction at a first position in the time direction is different from the number of random access channels multiplexed at a second position in the time direction.

[0091] (Clause 2) The terminal according to clause 1, further comprising: a receiving unit that receives, from a base station, configuration information indicating the number of random access channel opportunities in different frequency directions for each position in the time direction; and the control unit that sets the random access channel opportunities based on the configuration information.

[0092] (Clause 3) A terminal as described in clause 1, comprising a receiving unit that receives synchronization signal blocks, wherein the control unit associates an index of the synchronization signal block with each of the random access channel opportunities, the random access channel opportunities include a first opportunity and a second opportunity, and the number of indices of the synchronization signal block associated with the first opportunity is different from the number of indices of the synchronization signal block associated with the second opportunity.

[0093] (Clause 4) A terminal as described in clause 3, comprising a receiving unit that receives, from a base station, configuration information indicating the number of indexes of the synchronization signal blocks associated with the random access channel opportunities for each position in the time direction or the number of indexes of the synchronization signal blocks associated with the random access channel opportunities for each of the random access channel opportunities, and the control unit associates the indexes of the synchronization signal blocks with each of the random access channel opportunities based on the configuration information.

[0094] (Clause 5) A terminal as described in clause 1, comprising a receiving unit that receives synchronization signal blocks, wherein when the product of the sum of the number of indexes of the synchronization signal blocks associated with each random access channel opportunity and the number of the random access channel opportunities is different from the number of indexes of the synchronization signal blocks, the control unit associates an index of the synchronization signal block with each of the random access channel opportunities so that the number of the random access channel opportunities per number of indexes of the synchronization signal block approaches an average value.

[0095] (Clause 6) A communication method executed by a terminal, comprising: a step of setting a random access channel opportunity for transmitting a random access channel; and a step of transmitting the random access channel based on the set random access channel opportunity, wherein the random access channel opportunities are set so that the number of random access channel opportunities multiplexed in the frequency direction at a first position in the time direction is different from the number of random access channels multiplexed at a second position in the time direction.

[0096] Any of the above configurations allows a wireless communication system to appropriately perform RO configuration taking into account dynamic adaptation of SSB transmission opportunities. According to the second term, a terminal can flexibly perform RO configuration in the frequency direction based on configuration information from a base station. According to the third term, an RO association corresponding to an SSB can be appropriately performed taking into account dynamic adaptation of SSB transmission opportunities. According to the fourth term, a terminal can appropriately perform RO association corresponding to an SSB based on configuration information from a base station.

[0097] (Hardware Configuration) The block diagrams (FIGS. 11 and 12) 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 directly or indirectly connected (for example, using wires, wirelessly, etc.) and these multiple devices. The functional block may be realized by combining software with the single device or the multiple devices.

[0098] Functions include, but are not limited to, judgment, determination, assessment, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, selection, establishment, comparison, assumption, expectation, consideration, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, 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.

[0099] 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. 13 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.

[0100] In the following description, the term "apparatus" can be interpreted 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.

[0101] Each function in the base station 10 and the terminal 20 is realized by loading specified 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.

[0102] 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.

[0103] 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. 11 may be implemented by a control program stored in the storage device 1002 and running on the processor 1001. Furthermore, for example, the control unit 240 of the terminal 20 shown in FIG. 12 may be implemented by a control program stored in the storage device 1002 and running on 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 also be transmitted from a network via a telecommunications line.

[0104] 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.

[0105] 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 (registered trademark) disk), a smart card, a flash memory (e.g., a card, a stick, a key drive), a floppy (registered trademark) disk, a magnetic strip, etc. The above-mentioned storage medium may be, for example, a database, a server, or other appropriate medium including at least one of the storage device 1002 and the secondary storage device 1003.

[0106] 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, a communication module, etc. 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.

[0107] The input device 1005 is an input device (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that accepts input from the outside. The output device 1006 is an output device (e.g., a display, a speaker, an LED lamp, etc.) that outputs to the outside. Note that the input device 1005 and the output device 1006 may be integrated into one device (e.g., a touch panel).

[0108] 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.

[0109] Furthermore, the base station 10 and the 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, the processor 1001 may be implemented using at least one of these pieces of hardware.

[0110] Fig. 14 shows an example configuration of a vehicle 2001. As shown in Fig. 14, 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.

[0111] 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.

[0112] The electronic control unit 2010 is composed of a microprocessor 2031, 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).

[0113] 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.

[0114] 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 provides various types of multimedia information and multimedia services to the occupants of the vehicle 2001 by using information acquired from external devices via the communication module 2013, etc.

[0115] The driving assistance system unit 2030 is composed of various devices that provide functions for preventing accidents and reducing the driving burden on the driver, such as millimeter-wave radar, LiDAR (Light Detection and Ranging), cameras, positioning locators (e.g., GNSS, etc.), map information (e.g., high-definition (HD) maps, autonomous vehicle (AV) maps, etc.), gyro systems (e.g., IMU (Inertial Measurement Unit), INS (Inertial Navigation System), etc.), AI (Artificial Intelligence) chips, and AI processors, as well as one or more ECUs that control these devices. In addition, the driving assistance system unit 2030 transmits and receives various information via the communication module 2013 to realize the driving assistance function or the autonomous driving function.

[0116] 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.

[0117] 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.

[0118] 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 detection signals for detecting obstacles, vehicles, pedestrians, etc. acquired by an object detection sensor 2028, all of which are input to the electronic control unit 2010.

[0119] The communication module 2013 receives various information (traffic information, traffic signal information, vehicle distance information, etc.) transmitted from external devices and displays it on the 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, axles 2009, sensors 2021 to 2029, etc. provided in the vehicle 2001.

[0120] (Supplementary Notes on the Embodiments) Although the present embodiment has 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; matters described in two or more items may be used in combination as needed, and matters described in one item may apply to matters described in another item (as long as there is no contradiction). Boundaries between functional units or processing units in functional block diagrams do not necessarily correspond to 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 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, but such devices may be realized by hardware, software, or a combination thereof. The software operated by the processor of the base station 10 according to this embodiment and the software operated by the processor of the terminal 20 according to this embodiment may each be stored in random access memory (RAM), flash memory, read-only memory (ROM), EPROM, EEPROM, register, hard disk (HDD), removable disk, CD-ROM, database, server or any other suitable storage medium.

[0121] 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.

[0122] Each aspect / embodiment described in the present disclosure may be implemented using any of the following standards: 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 a 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 802.17 (WiMAX (registered trademark)), IEEE 802.19 (WiMAX (registered trademark)), IEEE 802.20 (WiMAX (registered trademark)), IEEE 802.21 (Wi-Fi (registered trademark)), IEEE 802.22 (WiMAX (registered trademark)), IEEE 802.23 (WiMAX (registered trademark)), IEEE 802.24 (WiMAX (registered trademark)), IEEE 802.25 (WiMAX (registered trademark)), IEEE 802.26 (WiMAX (registered trademark)), IEEE 802.27 (WiMAX (registered trademark)), IEEE 802.28 (WiMAX (registered trademark)), IEEE 802.29 (WiMAX (registered trademark)), IEEE 802.30 (WiMAX (registered trademark)), IEEE 802.31 (Wi-Fi (registered trademark)), IEEE 802.32 (WiMAX (registered trademark)), IEEE 802.33 (WiMAX (registered trademark)), IEEE 802.34 ( The present invention may be applied to at least one of systems using 802.20, UWB (Ultra-Wide Band), Bluetooth (registered trademark), or other suitable 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 LTE and / or LTE-A with 5G).

[0123] The order of the procedures, sequences, flowcharts, etc. of each aspect / embodiment described herein may be rearranged 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.

[0124] In this specification, a specific operation described as being performed by the base station 10 may 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).

[0125] The information, signals, etc. 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.

[0126] 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 transmitted to another device.

[0127] In the present disclosure, the determination may be made by a value represented by one bit (0 or 1), by a Boolean value (true or false), or by a comparison of numerical values ​​(e.g., comparison with a predetermined value).

[0128] 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.

[0129] 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.

[0130] 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.

[0131] Note that terms described 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.

[0132] As used in this disclosure, the terms "system" and "network" are used interchangeably.

[0133] 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.

[0134] 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.

[0135] In the present 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. A base station may also be referred to by terms such as a macrocell, a small cell, a femtocell, and a picocell.

[0136] 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 partitioned into multiple smaller areas, and each smaller area can also be provided with communication services by a base station subsystem (e.g., a small indoor base station (RRH: Remote Radio Head)). The terms "cell" or "sector" refer to part or all of the coverage area of ​​a base station and / or base station subsystem that provides communication services within that coverage.

[0137] In this disclosure, the terms "Mobile Station (MS)," "user terminal," "User Equipment (UE)," "terminal," and the like may be used interchangeably.

[0138] 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.

[0139] At least one of the base station and the mobile station may be referred to as 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, the mobile body itself, etc. 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.

[0140] 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 multiple terminals 20 (which may be called, for example, Device-to-Device (D2D) or Vehicle-to-Everything (V2X)). 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.

[0141] 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.

[0142] 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.

[0143] 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.

[0144] The reference signal may be abbreviated as RS (Reference Signal) or may be called a pilot depending on the applicable standard.

[0145] 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."

[0146] 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.

[0147] The "means" in the configuration of each of the above devices may be replaced with "part," "circuit," "device," etc.

[0148] When the terms "include," "including," and variations thereof are used in this disclosure, these terms are intended to be inclusive, similar to the term "comprising." Furthermore, when the term "or" is used in this disclosure, it is not intended to be an exclusive or.

[0149] 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.

[0150] Numerology may be communication parameters that apply to the transmission and / or 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, specific windowing operations performed by the transceiver in the time domain, etc.

[0151] 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.

[0152] 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.

[0153] 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.

[0154] 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.

[0155] 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.

[0156] 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.

[0157] 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.

[0158] 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.

[0159] 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 greater than or equal to 1 ms.

[0160] A resource block (RB) is a resource allocation unit in the time domain and the 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 the numerology, for example, 12. The number of subcarriers included in an RB may be determined based on the numerology.

[0161] 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.

[0162] 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, etc.

[0163] 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.

[0164] 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 BWP and numbered within the BWP.

[0165] 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.

[0166] 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."

[0167] The above-described structures of radio frames, subframes, slots, minislots, symbols, etc. are merely examples, and various changes may be made to 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.

[0168] 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.

[0169] 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."

[0170] The aspects / embodiments described in this disclosure may be used alone, in combination, or switched depending on the implementation. Notification of predetermined information (e.g., notification that "X is true") is not limited to explicit notification, but may be implicit (e.g., not notifying the predetermined information).

[0171] 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.

[0172] 10 Base station 110 Transmitter 120 Receiver 130 Setting unit 140 Control unit 20 Terminal 210 Transmitter 220 Receiver 230 Setting unit 240 Control unit 1001 Processor 1002 Storage device 1003 Auxiliary storage device 1004 Communication device 1005 Input device 1006 Output device 2001 Vehicle 2002 Drive unit 2003 Steering unit 2004 Accelerator pedal 2005 Brake pedal 2006 Shift lever 2007 Front wheels 2008 Rear wheels 2009 Axle 2010 Electronic control unit 2012 Information service unit 2013 Communication module 2021 Current sensor 2022 Rotation speed sensor 2023 Tire 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 system unit 2031 Microprocessor 2032 Memory (ROM, RAM) 2033 Communication port (IO port)

Claims

1. A terminal comprising: a control unit configured to set a random access channel opportunity for transmitting a random access channel; and a transmission unit configured to transmit the random access channel based on the set random access channel opportunity, wherein the random access channel opportunity is set such that the number of random access channel opportunities multiplexed in the frequency direction at a first position in the time direction is different from the number of random access channels multiplexed at a second position in the time direction.

2. The terminal according to claim 1, further comprising a reception unit configured to receive, from a base station, setting information indicating the number of random access channel opportunities in different frequency directions for each position in the time direction, wherein the control unit sets the random access channel opportunity based on the setting information.

3. The terminal according to claim 1, further comprising a reception unit configured to receive a synchronization signal block, wherein the control unit associates an index of the synchronization signal block with each of the random access channel opportunities, the random access channel opportunities include a first opportunity and a second opportunity, and the number of indices of the synchronization signal block associated with the first opportunity is different from the number of indices of the synchronization signal block associated with the second opportunity.

4. The terminal according to claim 3, further comprising a reception unit configured to receive, from a base station, setting information indicating the number of indices of the synchronization signal block associated with the random access channel opportunity for each position in the time direction or for each random access channel opportunity, wherein the control unit associates an index of the synchronization signal block with each of the random access channel opportunities based on the setting information.

5. The terminal according to claim 1, comprising a receiving unit that receives a synchronization signal block, wherein when the product of the total number of indexes of the synchronization signal blocks associated with each random access channel opportunity and the number of random access channel opportunities is different from the number of indexes of the synchronization signal blocks, the control unit associates the index of the synchronization signal block with each of the random access channel opportunities so that the number of random access channel opportunities per index of the synchronization signal block approaches an average value.

6. A communication method executed by a terminal, comprising: setting a random access channel opportunity for transmitting a random access channel; and transmitting the random access channel based on the set random access channel opportunity, wherein the random access channel opportunity is set such that the number of random access channel opportunities multiplexed in the frequency direction at a first position in the time direction is different from the number of random access channels multiplexed at a second position in the time direction.

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