Terminal, wireless communication method, and base station

Abstract

A terminal according to one aspect of the present disclosure includes: a receiving unit that receives a media access control - control element (MAC CE) representing a mapping between one or more values of parameters for a sounding reference signal resource set (SRS resource set) or SRS resources and one or more values of fields in downlink control information, and receives the downlink control information; and a control unit that determines values of the parameters based on the MAC CE and the downlink control information. According to one aspect of the present disclosure, it is possible to flexibly control parameters of SRS.

Description

Technical Field

[0001] The present disclosure relates to a terminal, a wireless communication method, and a base station in a next-generation mobile communication system. Background Art

[0002] In a Universal Mobile Telecommunications System (UMTS) network, Long Term Evolution (LTE) has been standardized for the purpose of further high-speed data rates, low latency, etc. (Non-Patent Document 1). In addition, for the purpose of further large capacity and high performance of LTE (Third Generation Partnership Project (3GPP) Release (Rel.) 8, 9), LTE-Advanced (3GPP Rel. 10-14) has been standardized.

[0003] Research is also being conducted on a successor system to LTE (for example, also referred to as the 5th generation mobile communication system (5G), 5G+ (plus), 6th generation mobile communication system (6G), New Radio (NR), 3GPP Rel. 15 and later, etc.).

[0004] Prior Art Documents

[0005] Non-Patent Documents

[0006] Non-Patent Document 1: 3GPP TS 36.300 V8.12.0 "Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2 (Release 8)", April 2010 Summary of the Invention

[0007] Problems to be Solved by the Invention

[0008] In NR, the uses of the Sounding Reference Signal (SRS) are diverse. The SRS in NR is not only used for CSI measurement in the uplink (UL), but also for CSI measurement in the downlink (DL), beam management, etc.

[0009] However, there has been no research on flexibly controlling the parameters of the SRS. If the parameters of the SRS cannot be flexibly set, there are concerns about deterioration in resource utilization efficiency, communication throughput, communication quality, etc.

[0010] Therefore, one object of the present disclosure is to provide a terminal, a wireless communication method, and a base station that can flexibly control the parameters of the SRS.

[0011] Means for Solving the Problem

[0012] A terminal according to one embodiment of the present disclosure includes: a receiving unit that receives a Media Access Control - Control Element (MAC CE) representing a mapping between one or more values of parameters for a sounding reference signal resource set, i.e., an SRS resource set or an SRS resource, and one or more values of fields in downlink control information, and receives the downlink control information; and a control unit that determines the values of the parameters based on the MAC CE and the downlink control information.

[0013] Effect of the Invention

[0014] According to one embodiment of the present disclosure, the parameters of the SRS can be flexibly controlled. Description of the Drawings

[0015] Figure 1 It is a diagram showing an example of the association between the values of a 2 - bit SRS request field and an SRS resource set.

[0016] Figure 2 It is a diagram showing an example of the association between the values of a 1 - bit SRS request field and an SRS resource set.

[0017] Figure 3 It is a diagram showing an example of a MAC CE1 of the first embodiment.

[0018] Figure 4A And Figure 4B It is a diagram showing an example of a variation of the MAC CE1 of the first embodiment.

[0019] Figure 5A And Figure 5B It is a diagram showing an example of a MAC CE2 of the first embodiment.

[0020] Figure 6A and Figure 6B FIG. is an example of a MAC CE for activation / deactivation of an SRS resource set showing a third embodiment.

[0021] Figure 7A and Figure 7B FIG. is an example of a MAC CE showing the mapping of the value of an SRS request field to a specific parameter in a third embodiment.

[0022] Figure 8A and Figure 8B FIG. is an example of a variation 1 of a MAC CE showing the mapping of the value of an SRS request field to a specific parameter in a third embodiment.

[0023] Figure 9A and Figure 9B FIG. is an example of a variation 2 of a MAC CE showing the mapping of the value of an SRS request field to a specific parameter in a third embodiment.

[0024] Figure 10 FIG. is an example of a MAC CE representing A-SRS resource triggering in a third embodiment.

[0025] Figure 11 FIG. is an example of option 1 of variation 3 in a fourth embodiment.

[0026] Figure 12 FIG. is an example of option 2 of variation 3 in a fourth embodiment.

[0027] Figure 13 FIG. is an example of option 3 of variation 3 in a fourth embodiment.

[0028] Figure 14 FIG. is an example of a schematic structure of a wireless communication system according to an embodiment.

[0029] Figure 15 FIG. is an example of a structure of a base station according to an embodiment.

[0030] Figure 16 FIG. is an example of a structure of a user terminal according to an embodiment.

[0031] Figure 17 FIG. is an example of a hardware structure of a base station and a user terminal according to an embodiment. DETAILED DESCRIPTION

[0032] (SRS)

[0033] In NR, the reference signal for measurement (Sounding Reference Signal (SRS)) has various uses. The SRS in NR is used not only for the CSI measurement of the uplink (UL) which is also used in the existing LTE (LTE Rel.8-14), but also for the CSI measurement of the downlink (DL), beam management, etc.

[0034] A UE can also be configured with one or more SRS resources. The SRS resources can also be determined by the SRS Resource Index (SRI).

[0035] Each SRS resource can also have one or more SRS ports (can also correspond to one or more SRS ports). For example, the number of ports for each SRS can also be 1, 2, 4, etc.

[0036] A UE can also be configured with one or more SRS resource sets. An SRS resource set can also be associated with a specific number of SRS resources. Regarding the SRS resources included in an SRS resource set, the UE can also commonly use the high-layer parameters. In addition, the resource set in this disclosure can also be replaced with a set (collection), resource group, group, etc.

[0037] The information related to the SRS resources or resource sets can also be set for the UE using high-layer signaling, physical-layer signaling, or a combination of them.

[0038] In addition, in this disclosure, the high-layer signaling can also be any one of or a combination of, for example, Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, etc.

[0039] MAC signaling can also use, for example, MAC control elements (MAC Control Element (MAC CE)), MAC protocol data units (MAC Protocol Data Unit (PDU)), etc. Broadcast information can also be, for example, the Master Information Block (Master Information Block (MIB)), System Information Block (System Information Block (SIB)), minimum system information (Remaining Minimum System Information (RMSI)), other system information (Other System Information (OSI)), etc.

[0040] Physical layer signaling can also be, for example, downlink control information (Downlink Control Information (DCI)).

[0041] SRS configuration information (e.g., "SRS-Config" of the RRC information element) can also include SRS resource set configuration information, SRS resource configuration information, etc.

[0042] SRS resource set configuration information (e.g., "SRS-ResourceSet" of the RRC parameter) can also include the SRS resource set ID (Identifier) (SRS-ResourceSetId), a list of SRS resource IDs (SRS-ResourceId) used in this resource set, the SRS resource type (resourceType), and information on the usage of SRS.

[0043] Here, the SRS resource type can also represent the time-domain behavior of the SRS resource configuration (same time-domain behavior), and can also represent any one of Periodic SRS (P-SRS), Semi-Persistent SRS (SP-SRS), and Aperiodic SRS (A-SRS). In addition, the UE can also send P-SRS and SP-SRS periodically (or periodically after activation). The UE can also send A-SRS based on the SRS request of DCI.

[0044] In addition, the uses of SRS (the "usage" of RRC parameters, the "SRS-SetUse" of L1 (Layer-1) parameters) can also be, for example, beam management, codebook (CB), non-codebook (NCB), antenna switching, etc. For example, SRS for codebook or non-codebook use can also be used for the determination of the precoder for codebook- or non-codebook-based uplink shared channel (Physical Uplink Shared Channel (PUSCH)) transmission based on SRI.

[0045] For SRS for beam management use, it can also be assumed that for each SRS resource set, only one SRS resource can be transmitted instantaneously at a specific time. Additionally, when multiple SRS resources corresponding to the same time domain action in the same Bandwidth Part (BWP) belong to different SRS resource sets, these SRS resources can also be transmitted simultaneously.

[0046] SRS resource setting information (for example, the "SRS-Resource" of RRC parameters) can also include SRS resource ID (SRS-ResourceId), the number of SRS ports, SRS port numbers, transmission Comb, SRS resource mapping (for example, time and / or frequency resource location, resource offset, period of the resource, number of repetitions, number of SRS symbols, SRS bandwidth, etc.), hopping association information, SRS resource type, sequence ID, spatial relationship information, etc.

[0047] The UE can either switch the Bandwidth Part (BWP) for transmitting SRS on a per-slot basis or switch antennas. In addition, the UE can also apply at least one of in-slot hopping and inter-slot hopping to SRS transmission.

[0048] (A-SRS trigger)

[0049] The SRS request field for triggering A-SRS is included, for example, in DCI formats 0_1, 0_2, 1_1, 1_2, 2_3.

[0050] As Figure 1 In the example like that, among the values (code points) of the 2-bit SRS request field, the three values 01, 10, and 11 other than the value 00 are associated (mapped) with one or more SRS resource sets.

[0051] The size of the SRS request field in DCI formats 0_2 and 1_2 can also be 0, 1, 2, or 3 bits. AsFigure 2 As in the example of , the value 1 in the value (code point) of the 1-bit SRS request field is associated (mapped) with more than one SRS resource set.

[0052] The time between the triggering of A-SRS and the transmission of SRS is the value k (slot offset) set by RRC.

[0053] The SRS resource set information element (SRS-ResourceSet) includes a slot offset (slotoffset) and an A-SRS resource trigger list (aperiodicSRS-ResourceTriggerList) for A-SRS. That is, the slot offset and the A-SRS resource trigger list are set for each SRS resource set. In the case where the slot offset is not set, the UE applies no offset (value 0). The A-SRS resource trigger list includes more than one A-SRS resource trigger (aperiodicSRS-ResourceTrigger) information element (status, ID). The A-SRS resource trigger indicates the DCI code point for transmitting SRS following the setting of the SRS resource set containing the A-SRS resource trigger.

[0054] Preferably, the flexibility of the parameters of SRS is improved. For example, in order for a large number of UEs to transmit SRS in the same UL slot and disperse the PDCCH load, it is preferable to improve the flexibility of A-SRS triggering so that the trigger grants for UEs (DCI, PDCCH including the SRS request field) are transmitted in multiple DL slots.

[0055] If the flexibility of the parameters of SRS is not improved, there is a concern that the utilization efficiency of resources, communication throughput, communication quality, etc. will deteriorate.

[0056] Therefore, the inventors of the present invention have come up with a method for flexible control of the parameters of SRS.

[0057] Hereinafter, embodiments related to the present disclosure will be described in detail with reference to the drawings. The wireless communication methods related to the respective embodiments can be applied separately or in combination.

[0058] In the present disclosure, "A / B" and "at least one of A and B" can also be replaced with each other. In the present disclosure, cell, serving cell, CC, carrier, BWP, DL BWP, UL BWP, active DL BWP, active UL BWP, and band can also be replaced with each other. In the present disclosure, index, ID, indicator, and resource ID can also be replaced with each other. In the present disclosure, RRC, RRC parameter, RRC message, higher layer parameter, information element (IE), and setting can also be replaced with each other. In the present disclosure, support, control, be able to control, operate, and be able to operate can also be replaced with each other. In the present disclosure, sequence, list, set, and group can also be replaced with each other. In the present disclosure, mapping, association, relationship, and table can also be replaced with each other.

[0059] In the present disclosure, activate, update, indicate, enable, and specify can also be replaced with each other.

[0060] In the present disclosure, MAC CE, update command, and activate / deactivate command can also be replaced with each other.

[0061] In the present disclosure, higher layer signaling can also be any one of, for example, Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, or a combination thereof.

[0062] MAC signaling can also use, for example, MAC Control Element (MAC CE), MAC Protocol Data Unit (PDU), etc. Broadcast information can also be, for example, Master Information Block (MIB), System Information Block (SIB), Remaining Minimum System Information (RMSI), Other System Information (OSI), etc.

[0063] In the following embodiments, the SRS resource set / SRS resource can also be replaced with the SRS resource set / SRS resource for a specific purpose (e.g., codebook, non-codebook, beam management), the SRS resource set / SRS resource for the same purpose, etc.

[0064] (Wireless Communication Method)

[0065] <First Embodiment>

[0066] For each SRS resource set or specific parameters set for the SRS resource set, they can also be controlled by MAC CE. The specific parameters can be either the parameters set for each SRS resource set by RRC or the parameters set for each SRS resource by RRC.

[0067] A value of a specific parameter can also be notified by RRC and MAC CE. DCI may not be used in the notification of the specific parameter.

[0068] The specific parameter can also be a parameter of the resource in the time domain / frequency domain of SRS (e.g., slot offset).

[0069] The value of the specific parameter can also follow any one of the following notification methods 1 to 3.

[0070] [Notification Method 1]

[0071] The value of the specific parameter can also be set by RRC and overwritten by MAC CE. The RRC parameter for setting the specific parameter can also be the same as the RRC parameter of Rel.15 / 16. A new MAC CE for updating the value of the specific parameter can also be introduced.

[0072] [Notification Method 2]

[0073] A list containing multiple values (candidates) of the specific parameter can also be set by RRC, and a value (index) within the list is specified by MAC CE. The RRC parameter for setting the specific parameter can also be different from the RRC parameter of Rel.15 / 16. A new MAC CE for specifying the value of the specific parameter can also be introduced.

[0074] [Notification Method 3]

[0075] The value of the specific parameter can also not be set by RRC. The value of the specific parameter can also be directly specified by MAC CE. The RRC parameter for setting the specific parameter can also be an optional field of Rel.15 / 16. A new MAC CE for specifying the value of the specific parameter can also be introduced. In the case where the RRC parameter for setting the specific parameter is not set, the value of the specific parameter can also be 0 (which can also be regarded as 0 (no offset)).

[0076] The new MAC CE can also be any one of the following MAC CE1 and 2.

[0077] 《MAC CE1》

[0078] The new MAC CE can also update / indicate / notify specific parameters within the SRS resource set.

[0079] The new MAC CE can also follow the aforementioned notification method 1 or 3.

[0080] In Figure 3 's example, the new MAC CE can also include at least one of a reservation (R) field (reserved bit), serving cell ID field, BWP ID field, SRS resource set ID field, and time slot offset field. When the value of the time slot offset is from 0 to 32, the size of the time slot offset field can also be 6 bits. In Rel.15, when the time slot offset is not set, the value of the time slot offset is 0. In this example, when the time slot offset is not set, the value of the time slot offset can also be the value notified by the MAC CE.

[0081] The new MAC CE can also follow at least one of the following changes 1 and 2.

[0082] [Change 1]

[0083] The size of the time slot offset field can also be less than 6 bits. As in Figure 4A 's example, the size of the time slot offset field can also be 4 bits, and the value of the time slot offset notified by the MAC CE can also be from 0 to 15. Thus, the number of octets (overhead) of the MAC CE can be reduced.

[0084] [Change 2]

[0085] The size of the time slot offset field can also be variable. The size of the time slot offset field can also be based on RRC parameters. In Figure 4B 's example, the number of bits used in the time slot offset field in octet 3 is variable.

[0086] RRC parameters can also be set to determine the size (number of bits) of the time slot offset field. The RRC parameters can also represent the maximum value of the time slot format value indicated by the MAC CE. For example, when the RRC parameter represents 15, values from 0 to 15 can also be indicated by the MAC CE, and the size of the time slot offset field can also be 4 bits.

[0087] The RRC parameter can also represent the minimum value of the slot format value indicated by the MAC CE. The maximum value of the slot format value indicated by the MAC CE can also be specified in the specification. For example, when the RRC parameter represents 15 and the maximum value is 32, values from 15 to 32 can also be indicated by the MAC CE, and the size of the slot offset field can also be 5 bits.

[0088] The RRC parameter can also represent the size of the slot format indicated by the MAC CE. For example, when the RRC parameter represents 3, the size of the slot offset field can also be 3 bits.

[0089] 《MAC CE2》

[0090] The new MAC CE can also update / indicate / notify specific parameters within the SRS resource set. One or more candidates for the specific parameters notified by the MAC CE can also be set by the RRC parameter.

[0091] The RRC parameter can also be a bitmap. The positions of the bits set to 1 in the bitmap can also correspond to the candidates for the specific parameters. For example, the range of the slot offset value can also be 0 to 32, and the size of the bitmap can also be 33 bits. The MAC CE can also indicate the value of the specific parameter by an index (list index) corresponding to the position of the bit set to 1.

[0092] As Figure 5A in the example, the number of candidates set by the RRC parameter among the values of the slot offset from 0 to 32 can also be 16 or less. In this case, as Figure 5B in the example, the list index specified by the slot offset field can also be 1 to 16 (or 0 to 15), and the size of the slot offset field can also be 4. Thus, the number of octets (overhead) of the MAC CE can be reduced.

[0093] The RRC parameter can also be a sequence (list) of candidates for the specific parameter. One value within the list can also be notified by the MAC CE.

[0094] The maximum number of candidates can be specified in the specification or set by higher layer signaling.

[0095] According to the above first embodiment, the SRS resource set or the SRS resource can be indicated by the MAC CE.

[0096] <Second Embodiment>

[0097] The specific parameters set for (each) SRS resource set or SRS resource can also be controlled by at least one of the MAC CE and the DCI.

[0098] One can also be notified of a value of a specific parameter via RRC and MAC CE. DCI may not be used in the notification of the specific parameter.

[0099] The specific parameter may also be a parameter of a resource in the time domain / frequency domain of SRS (e.g., slot offset).

[0100] The value of the specific parameter may also follow any one of the aforementioned notification methods 1 to 3 and the following notification method 4.

[0101] [Notification Method 4]

[0102] Multiple values (multiple candidates, list) of the specific parameter may also be notified / activated via at least one of RRC and MAC CE. One of the multiple values may also be indicated via DCI.

[0103] A new field (DCI field) within DCI for indicating the specific parameter may also be defined / added. In the case where new RRC parameters (e.g., Rel.17 RRC parameters) are set, a new DCI field may also exist within DCI. In the case where that is not the case, a new DCI field may not exist within DCI.

[0104] Regarding the specific parameter, the value of the new parameter may also be notified via an existing DCI field (of Rel.15 / 16). Thereby, the change in the specification can be minimized.

[0105] The existing DCI field may also be an SRS request field. The change in the specification may also be an increase in the number of SRS resource sets for a specific usage.

[0106] The existing DCI field may be either a time domain resource assignment (TDRA) field within UL grant (DCI for scheduling PUSCH) or a CSI request field, or a TDRA field within DL assignment (DCI for scheduling PDSCH).

[0107] The slot offset may also be the slot + K slots or the slot - K slots indicated by the TDRA field of the UL grant. The slot offset may also be the slot + K slots or the slot - K slots indicated by the CSI request field of the UL grant. The slot offset may also be the slot + K slots or the slot - K slots indicated by the TDRA field of the DL assignment. K may be defined in the specification or set via higher layer signaling. K may be 0 or other values.

[0108] 《Number of SRS Resource Sets That Can Be Set》

[0109] In Rel.15 / 16, for an SRS resource set for a usage with codebook transmission or non-codebook transmission, only one SRS resource set is configured by a higher layer parameter. In Rel.15 / 16, for an SRS resource set for a usage with antenna switching, the number (maximum number) of SRS resource sets that can be configured is determined according to the UE capabilities reported by the UE. For example, multiple SRS resource sets respectively correspond to different time slots, and antenna switching of SRS is performed across multiple time slots. In the UE capabilities of Rel.17, at least one of 1T (transmission antenna) 6R (reception antenna), 1T8R, 2T6R, 2T8R, 4T6R, 4T8R can also be added.

[0110] In the case where no new RRC parameters are configured for an SRS resource set for a usage with codebook transmission, non-codebook transmission, or antenna switching, the limitation on the number (maximum number) of SRS resource sets that can be configured in Rel.15 / 16 can also be applied.

[0111] In the case where new RRC parameters are configured, the number of SRS resource sets that can be configured can also be more than the number (maximum number) of SRS resource sets that can be configured in Rel.15 / 16. For each of codebook transmission, non-codebook transmission, or antenna switching, the maximum number of SRS resource sets corresponding to one code point of the SRS request field in the DCI can also be the number (maximum number) of SRS resource sets that can be configured in Rel.15 / 16. One code point of the SRS request field can also be a value (ID) of an aperiodic SRS resource trigger configured by higher layer signaling.

[0112] For example, the time slot offset can be controlled by DCI (SRS request field), and SRS antenna switching across multiple time slots can be performed by one DCI code point.

[0113] According to the second embodiment above, an SRS resource set or an SRS resource can be indicated by DCI.

[0114] <Third Embodiment>

[0115] A specific parameter can also be an SRS resource set or an aperiodic SRS resource trigger.

[0116] <Activation / Deactivation of SRS Resource Set>

[0117] Multiple SRS resource sets can also be configured via RRC, and several of the multiple SRS resource sets can be activated / deactivated via MAC CE. Regarding the number of activated SRS resource sets, the aforementioned limit on the number of SRS resource sets can also be applied.

[0118] The MAC CE can also include a field indicating the ID of the activated SRS resource set.

[0119] As Figure 6A in the example, the MAC CE can also include at least one of an R field, a serving cell ID field, a BWP ID field, and an activated SRS resource set ID field. The MAC CE can also include multiple activated SRS resource set ID fields. Multiple SRS resource sets can also be activated simultaneously. Multiple octets within the MAC CE can also each include an activated SRS resource set ID field.

[0120] As Figure 6B in the example, the MAC CE can also include at least one of an R field, a serving cell ID field, a BWP ID field, and a B x field. The B x field can also be a bitmap. Multiple SRS resource sets can also be activated simultaneously. The association between the value of x and the SRS resource set ID can also be configured via higher layer signaling. The value of x can also be associated with the ascending order of the SRS resource set IDs. The B x field can also span multiple octets according to the number of SRS resource sets configured via higher layer signaling. The number of octets can also be variable according to the number of SRS resource sets configured via higher layer signaling. The B x field can be in either ascending order or descending order of x.

[0121] 《SRS Resource Set ID or Value of A-SRS Resource Trigger》

[0122] The correspondence between the code points of the SRS request field and the value of the SRS resource set ID (or A-SRS resource trigger) can also be notified / updated via a new MAC CE. The mapping between DCI code points and one or more SRS resource sets can also be notified / updated via MAC CE.

[0123] As Figure 7A in the example, the relationship (e.g., a table) between the code points of the SRS request field and the content of the MAC CE can also be specified in the specification. The value 00 of the SRS request field can also indicate that no A-SRS resource set is triggered. The values 01, 10, and 11 of the SRS request field can also indicate that the SRS resource sets indicated by the first, second, and third SRS resource set IDs notified via MAC CE are triggered, respectively.

[0124] The UE that receives the MAC CE may also determine the SRS resource set or the value of the A-SRS resource trigger corresponding to the value of the SRS request field, not based on the table specified in Rel.15 / 16, but based on the corresponding relationship indicated by the MAC CE.

[0125] As Figure 7B in the example of, the new MAC CE may also include at least one of the R field, the serving cell ID field, the BWP ID field, and the B yx field. The B yx field may also be a bitmap. Multiple SRS resource sets may also be activated simultaneously. The association of the values of y and x with the SRS resource set ID may also be set by higher layer signaling. The B yx field may also be associated with the y-th SRS resource set ID. The value of x may also be associated with the ascending order of the SRS resource set ID. The value of y may also be associated with the ascending order of the SRS resource set ID. The B yx field may also span multiple octets according to the number of SRS resource sets set by higher layer signaling. The number of octets may also be variable according to the number of SRS resource sets set by higher layer signaling. The B yx The order of the fields may be either the ascending order of x, or the descending order of x, or the ascending order of y, or the descending order of y.

[0126] In this example, the position of one bit set to 1 in octet 2 may represent the first SRS resource set ID (corresponding to the value 01 of the SRS request field), the position of one bit set to 1 in octet 3 may represent the second SRS resource set ID (corresponding to the value 10 of the SRS request field), and the position of one bit set to 1 in octet 4 may represent the third SRS resource set ID (corresponding to the value 11 of the SRS request field).

[0127] [Change 1]

[0128] The new MAC CE may also include a field indicating whether each SRS resource set ID is associated with the value of the SRS request field.

[0129] As Figure 8A in the example of, the new MAC CE may also include at least one of the R field, the serving cell ID field, the BWP ID field, the T i field, and the B x field. One T i field may also be associated with multiple B x fields. It may also be the case that when the T i field is set to 1, the seven subsequent B xThe field exists. It is also possible in T i When the field is set to 0, the seven Bs after it x The field does not exist.

[0130] In at least one T i When the field is 0, the SRS resource set ID specified by the MAC CE can also be associated in ascending or descending order of the value of the SRS request field. For example, as Figure 8A In the example of, when 2 Ts i are set to 1, as Figure 8B In the example of, the two values of the SRS request field can also be continuously associated with the SRS resource set ID represented by the MAC CE starting from the maximum value 11 of the SRS request field (starting from the bottom row of the table). The remaining values of the SRS request field can also follow the association (table) of Rel.15 / 16.

[0131] [Change 2]

[0132] A list of one or more SRS resource set IDs can also be set by RRC. The list of SRS resource set IDs can also contain more than one group of SRS resources. A group can also contain more than one SRS resource. An index (list index, group index) can also be associated with each group. The list index can also be notified by the MAC CE.

[0133] As Figure 9A In the example of, a list of SRS resource set IDs containing four groups is set by RRC. The four groups correspond to list indices 0 to 3 respectively.

[0134] As Figure 9B In the example of, the new MAC CE can also contain at least one of the R field, serving cell ID field, BWP ID field, T i field, list index field. One T i field can also be associated with one list index field. It is also possible in T i When the field is set to 1, one list index field after it exists. It is also possible in T i When the field is set to 0, one list index field after it does not exist.

[0135] The list index field can also represent a list index. In this example, the list index field in octet 2 can also represent the first group of the SRS resource set ID (corresponding to the value 01 of the SRS request field), the list index field in octet 3 can also represent the second group of the SRS resource set ID (corresponding to the value 10 of the SRS request field), and the list index field in octet 4 can also represent the third group of the SRS resource set ID (corresponding to the value 11 of the SRS request field).

[0136] When the size of the SRS request field is N bits, the number of list index fields in the MAC CE can be either 2^N - 1 or less than 2^N - 1. When the number of list index fields in the MAC CE is less than 2^N - 1, similar to Figure 8, the groups represented by the list index fields can also be continuously associated with the values of the SRS request field starting from the maximum value 11 of the SRS request field (starting from the bottom row of the table). The remaining values of the SRS request field can also follow the association (table) of Rel.15 / 16.

[0137] 《A-SRS Resource Trigger Value》

[0138] The A-SRS resource trigger value (A-SRS resource trigger ID, for example, any one of 1, 2, 3) of the SRS resource set can also be notified through the MAC CE.

[0139] The relationship (table) between the value of the SRS request field and the SRS resource set ID may not be specified in the specification. The existing relationship (table) between the value of the SRS request field and the SRS resource set can also be applied.

[0140] For multiple SRS resource sets, the same A-SRS resource trigger value can also be set (especially in the case of antenna switching).

[0141] The A-SRS resource trigger value can also follow at least one of the following Operations 1 and 2.

[0142] [Operation 1]

[0143] The A-SRS resource trigger value can also be updated only for the SRS resource set notified through the MAC CE. Thus, the A-SRS resource trigger value can be flexibly indicated through the MAC CE.

[0144] [Operation 2]

[0145] In the case where the value of the A-SRS resource trigger is notified by MAC CE, it is also possible to update the A-SRS resource trigger value of all SRS resource sets set with the same value as the A-SRS resource trigger before the notification. Thereby, the overhead of MAC CE can be suppressed.

[0146] The combination of SRS resource sets updated by one MAC CE can also be set by a higher layer parameter (for example, an applicable SRS resource set list). Operation 2 can also be performed only when the higher layer parameter is set.

[0147] Operation 2 is not limited to the notification of the A-SRS resource trigger ID. Operation 2 can also be applied to the parameters updated by MAC CE for each SRS resource set.

[0148] As Figure 10 such, the new MAC CE can also include at least one of an R field, a serving cell ID field, a BWP ID field, an SRS resource set ID, and an A-SRS resource trigger ID field.

[0149] The A-SRS resource trigger ID field can also overwrite the value set by RRC. It is also possible to set an A-SRS resource trigger ID list by RRC, and the index (position) within the list is specified by the A-SRS resource trigger ID field of MAC CE. In the case where an A-SRS resource trigger ID is not notified by RRC, the notification using the A-SRS resource trigger ID of MAC CE can also be applied.

[0150] 《Trigger DCI》

[0151] The SRS request field for triggering A-SRS may not be included in the UL grant (UL DCI) / DL allocation (DL DCI).

[0152] Existing UL / DL DCI cannot trigger A-SRS without scheduling of PUSCH / PDSCH.

[0153] Under satisfied conditions, it is also possible to use the SRS request field included in UL / DL DCI in the selection of SRS resource set / SRS resource parameters. Regarding the conditions, it may also be that a specific RRC parameter is received. Thereby, it is possible to more flexibly control A-SRS without changing the field size of the existing DCI.

[0154] A new radio network temporally identifier (RNTI) (e.g., SRS-RNTI) that can also be specified for triggering A-SRS can be used. DCI with a cyclic redundancy check (CRC) scrambled by the SRS-RNTI can also be used only for triggering A-SRS (and may not be scheduled). When a new RNTI is specified, an increase in the number of blind detections can be prevented compared to the case where a new DCI format is specified.

[0155] A new DCI format that can also be specified for triggering A-SRS can be used.

[0156] The DCI format used for triggering A-SRS can also be a specific DCI format. The specific DCI format can also be a DCI format in the existing DCI formats that can trigger A-SRS.

[0157] It is also possible to replace fields other than the SRS request field and use the structure that triggers SRS through the SRS request field to select the parameters of the SRS resource set / SRS resource. The value 00 of the existing SRS request field indicates that SRS is not triggered. DCI with a CRC scrambled by the SRS-RNTI does not require a state where SRS is not triggered. The value 00 of the SRS request field in the DCI with a CRC scrambled by the SRS-RNTI can also be associated with the SRS resource set.

[0158] The size of the SRS request field in the DCI with a CRC scrambled by the SRS-RNTI is not limited to 2 bits or 3 bits, and can also be 4 bits or more.

[0159] In the association (table) of the SRS request field with the SRS resource set (or A-SRS resource trigger) in Rel.15 / 16, the SRS resource set can also be associated with the value 00 of the SRS request field. For the value 00 of the SRS request field, the A-SRS resource set triggered for DCI formats 0_1, 0_2, 1_1, 1_2, and 2_3 with the higher-layer parameter SRS-TPCPDCCH group (srs-TPC-PDCCH-Group) set to type B can also be the SRS resource set with the higher-layer parameter A-SRS resource trigger set to 1 or an entry set to 1 within the higher-layer parameter A-SRS resource trigger list. For the value 00 of the SRS request field, the A-SRS resource set triggered for DCI format 2_3 with the higher-layer parameter SRS-TPCPDCCH group (srs-TPC-PDCCH-Group) set to type A can also be the SRS resource set with the (usage within the SRS resource set) usage set to antenna switching (higher-layer parameter usage), and the resource type (within the SRS resource set) set to "aperiodic" for the first set of serving cells set by higher layers, and can also be the SRS resource set set by the positioning SRS resource set and with the resource type (within the positioning SRS resource set) set to "aperiodic" for the first set of serving cells set by higher layers.

[0160] In this case, there can also be a DCI field indicating one or more triggered SRS resource sets, and the UE can also send A-SRS corresponding to the one or more SRS resource sets indicated by this field.

[0161] Multiple values (candidates) of the slot offset can also be notified via RRC / MAC CE, and there is a DCI field indicating one value from these multiple values, and the UE uses the slot offset indicated by this field to send A-SRS.

[0162] According to the above third embodiment, the SRS resource set can be notified via MAC CE / DCI.

[0163] <Fourth Embodiment>

[0164] <Variation 1>

[0165] When specific parameters set for (each) SRS resource set or SRS resource set are indicated by DCI, it can also be that the fields of the MAC CE of at least one of the first to third embodiments are extended, multiple candidates of SRS resource sets / SRS resources / SRS parameters are activated by this field, and one of the multiple candidates is indicated by DCI.

[0166] "Change 2"

[0167] At least one of the first to third embodiments may also be applied only when the corresponding UE capability is reported by the UE.

[0168] The UE capability may also indicate whether at least one of the first to third embodiments is supported.

[0169] The UE capability may also indicate the number (maximum number) of SRS resource sets / SRS resources supported in at least one of the first to third embodiments.

[0170] The UE capability may also indicate the number (maximum number) of SRS resource sets / SRS resources that can be controlled by MAC CE / DCI of at least one of the first to third embodiments.

[0171] At least one of the first to third embodiments may also be applied only when the UE is set with the corresponding higher-layer parameter. Otherwise, the UE may also apply the operations of Rel.15 / 16.

[0172] "Change 3"

[0173] To improve the flexibility of A-SRS, at least one of the following Extensions 1 and 2 may be considered.

[0174] [Extension 1]

[0175] Introduce an extension of MAC CE. This extension may also follow at least one of the following Options 1 to 3.

[0176] [[Option 1]]

[0177] The MAC CE may also activate one or more SRS resource sets. It may also be that only the activation of the SRS resource set is triggered by the SRS request field of the DCI.

[0178] As Figure 11 In the example of, in Rel.15 / 16, SRS resource set #1 which is set with the use of the codebook. In Option 1, it may also be that SRS resource sets #1 and #2 which are set with the use of the codebook, and SRS resource set #2 is activated by the MAC CE.

[0179] [[Option 2]]

[0180] The MAC CE may also update the mapping between the DCI code point and the A-SRS resource trigger.

[0181] As Figure 12As in the example of , in Rel. 15 / 16, the A-SRS resource trigger is associated with a value other than 00 in the 2-bit SRS request field. In Option 2, one or more SRS resource set IDs indicated by MAC CE can also be associated with a value other than 00 in the 2-bit SRS request field.

[0182] [[Option 3]]

[0183] The MAC CE can also update specific parameters of the SRS. For example, the specific parameter can also be the slot offset.

[0184] As Figure 13 in the example of , in Rel. 15 / 16, SRS resource set #1 is configured with the use of a codebook and a slot offset = 1. In Option 3, the slot offset of SRS resource set #1 can also be updated by the MAC CE.

[0185] In Option 1 / 2, the number (maximum number) of SRS resource sets that can be configured for the given use is increased.

[0186] [Extension 2]

[0187] Trigger an extension of the DCI.

[0188] The number of bits in the SRS request field can also be increased.

[0189] A new DCI field can also be appended based on the SRS request field.

[0190] A new RNTI (e.g., SRS-RNTI) for generating DCI dedicated to A-SRS triggering can also be introduced.

[0191] A new DCI format for generating DCI dedicated to A-SRS triggering can also be introduced.

[0192] In addition to the SRS request field, existing DCI fields for controlling SRS triggering can also be reused.

[0193] [Change 4]

[0194] The MAC CE activation time required for applying at least one of the first to third embodiments may also be needed.

[0195] The UE may also follow at least one of the following Operations 1 and 2.

[0196] [Operation 1]

[0197] The UE uses the SRS resource (parameter) updated by the MAC CE for SRS transmission triggered by DCI received after the MAC CE activation time from the reception of the MAC CE.

[0198] [Operation 2]

[0199] The UE uses the SRS resource (parameter) updated by the MAC CE for SRS transmission after the MAC CE activation time from the reception of the MAC CE.

[0200] The MAC CE activation time can also be different among A-SRS, SP-SRS, and P-SRS. For example, in Operation 1, the MAC CE activation time for S-SRS can also be 3 subframe times (3 msec), and the MAC CE activation time for SP / P-SRS can also be 3 subframe times (3 msec) + T. T can be specified in the specification, notified by a higher layer, or reported by UE capabilities.

[0201] (Wireless communication system)

[0202] Hereinafter, the structure of a wireless communication system according to an embodiment of the present disclosure will be described. In this wireless communication system, any one or a combination of the above-described wireless communication methods according to the respective embodiments of the present disclosure is used for communication.

[0203] Figure 14 It is a diagram showing an example of the schematic structure of a wireless communication system according to an embodiment. The wireless communication system 1 can also be a system that realizes communication using Long Term Evolution (LTE) standardized by the Third Generation Partnership Project (3GPP), the 5th generation mobile communication system New Radio (5G NR), or the like.

[0204] In addition, the wireless communication system 1 may also support dual connectivity (Multi-RAT Dual Connectivity (MR-DC)) between multiple Radio Access Technologies (RATs). MR-DC may also include dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (EN-DC)), dual connectivity between NR and LTE (NR-E-UTRA Dual Connectivity (NE-DC)), and so on.

[0205] In EN-DC, the base station (eNB) of LTE (E-UTRA) is the Master Node (MN), and the base station (gNB) of NR is the Secondary Node (SN). In NE-DC, the base station (gNB) of NR is the MN, and the base station (eNB) of LTE (E-UTRA) is the SN.

[0206] The wireless communication system 1 may also support dual connectivity between multiple base stations within the same RAT (for example, dual connectivity where both the MN and the SN are base stations (gNBs) of NR (NR-NR Dual Connectivity (NN-DC))).

[0207] The wireless communication system 1 may also include a base station 11 that forms a macro cell C1 with a relatively wide coverage area, and a base station 12 (12a - 12c) that is configured within the macro cell C1 and forms a small cell C2 that is narrower than the macro cell C1. The user terminal 20 may also be located within at least one cell. The configuration, quantity, etc. of each cell and the user terminal 20 are not limited to the manner shown in the figure. Hereinafter, without distinguishing between the base stations 11 and 12, they are collectively referred to as the base station 10.

[0208] The user terminal 20 may also be connected to at least one of the multiple base stations 10. The user terminal 20 may also utilize at least one of Carrier Aggregation (CA) and Dual Connectivity (DC) that uses multiple Component Carriers (CCs).

[0209] Each CC may also be included in at least one of a first frequency band (Frequency Range 1 (FR1)) and a second frequency band (Frequency Range 2 (FR2)). The macro cell C1 may also be included in FR1, and the small cell C2 may also be included in FR2. For example, FR1 may also be a frequency band below 6 GHz (sub-6 GHz), and FR2 may also be a frequency band above 24 GHz (above-24 GHz). Additionally, the frequency bands, definitions, etc. of FR1 and FR2 are not limited to these. For example, FR1 may also correspond to a frequency band higher than FR2.

[0210] Furthermore, in each CC, the user terminal 20 may also communicate using at least one of Time Division Duplex (TDD) and Frequency Division Duplex (FDD).

[0211] Multiple base stations 10 may also be connected via wire (e.g., optical fiber based on the Common Public Radio Interface (CPRI), X2 interface, etc.) or wirelessly (e.g., NR communication). For example, when NR communication is utilized as a backhaul between base stations 11 and 12, the base station 11 acting as the upper station may also be referred to as an Integrated Access Backhaul (IAB) donor, and the base station 12 acting as a relay station (relay) may also be referred to as an IAB node.

[0212] The base station 10 may also be connected to the core network 30 via other base stations 10 or directly. The core network 30 may, for example, also include at least one of an Evolved Packet Core (EPC), a 5G Core Network (5GCN), a Next Generation Core (NGC), etc.

[0213] The user terminal 20 may also be a terminal supporting at least one of communication modes such as LTE, LTE-A, 5G, etc.

[0214] In the wireless communication system 1, a wireless access method based on Orthogonal Frequency Division Multiplexing (OFDM) can also be used. For example, in at least one of the Downlink (DL) and the Uplink (UL), Cyclic Prefix OFDM (CP-OFDM), Discrete Fourier Transform Spread OFDM (DFT-s-OFDM), Orthogonal Frequency Division Multiple Access (OFDMA), Single Carrier Frequency Division Multiple Access (SC-FDMA), etc. can also be used.

[0215] The wireless access method can also be referred to as a waveform. In addition, in the wireless communication system 1, other wireless access methods (e.g., other single-carrier transmission methods, other multi-carrier transmission methods) can also be used in the wireless access methods of the UL and the DL.

[0216] As a downlink channel, in the wireless communication system 1, a downlink shared channel (Physical Downlink Shared Channel (PDSCH)), a broadcast channel (Physical Broadcast Channel (PBCH)), a downlink control channel (Physical Downlink Control Channel (PDCCH)), etc. that are shared among the user terminals 20 can also be used.

[0217] In addition, as an uplink channel, in the wireless communication system 1, an uplink shared channel (Physical Uplink Shared Channel (PUSCH)), an uplink control channel (Physical Uplink Control Channel (PUCCH)), a random access channel (Physical Random Access Channel (PRACH)), etc. that are shared among the user terminals 20 can also be used.

[0218] User data, high-layer control information, System Information Block (SIB), etc. are transmitted through the PDSCH. User data, high-layer control information, etc. can also be transmitted through the PUSCH. In addition, the Master Information Block (MIB) can also be transmitted through the PBCH.

[0219] Low-layer control information can also be transmitted through the PDCCH. The low-layer control information can also include, for example, downlink control information (Downlink Control Information (DCI)), and the downlink control information includes scheduling information for at least one of the PDSCH and the PUSCH.

[0220] In addition, the DCI that schedules the PDSCH can also be referred to as DL allocation, DL DCI, etc., and the DCI that schedules the PUSCH can also be referred to as UL grant, UL DCI, etc. In addition, the PDSCH can also be replaced by DL data, and the PUSCH can also be replaced by UL data.

[0221] In the detection of the PDCCH, the Control Resource Set (CORESET) and the search space can also be used. The CORESET corresponds to the resource for searching for DCI. The search space corresponds to the search area and search method for PDCCH candidates. One CORESET can also be associated with one or more search spaces. The UE can also monitor the CORESET associated with a certain search space based on the search space setting.

[0222] One search space can also correspond to PDCCH candidates equivalent to one or more aggregation levels. One or more search spaces can also be referred to as a search space set. In addition, the "search space", "search space set", "search space setting", "search space set setting", "CORESET", "CORESET setting", etc. in the present disclosure can also be replaced with each other.

[0223] Uplink control information (Uplink Control Information (UCI)) including at least one of channel state information (Channel State Information (CSI)), delivery confirmation information (e.g., which can also be referred to as Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), ACK / NACK, etc.), and scheduling request (Scheduling Request (SR)) can also be transmitted through PUCCH. The random access preamble for establishing a connection with a cell can also be transmitted through PRACH.

[0224] In addition, in the present disclosure, the downlink, uplink, etc. can also be expressed without "link". Further, it can also be expressed without "Physical" at the beginning of various channels.

[0225] In the wireless communication system 1, synchronization signal (Synchronization Signal (SS)), downlink reference signal (Downlink Reference Signal (DL-RS)), etc. can also be transmitted. As the DL-RS, in the wireless communication system 1, cell-specific reference signal (Cell-specific Reference Signal (CRS)), channel state information reference signal (Channel State Information Reference Signal (CSI-RS)), demodulation reference signal (DeModulation Reference Signal (DMRS)), positioning reference signal (Positioning Reference Signal (PRS)), phase tracking reference signal (Phase Tracking Reference Signal (PTRS)), etc. can also be transmitted.

[0226] The synchronization signal can, for example, also be at least one of the primary synchronization signal (Primary Synchronization Signal (PSS)) and the secondary synchronization signal (Secondary Synchronization Signal (SSS)). The signal block including SS (PSS, SSS) and PBCH (and DMRS for PBCH) can also be referred to as an SS / PBCH block, an SS block (SS Block (SSB)), etc. Additionally, SS, SSB, etc. can also be referred to as reference signals.

[0227] In addition, in the wireless communication system 1, as the uplink reference signal (UL-RS), it is also possible to transmit a measurement reference signal (sounding reference signal (SRS)), a demodulation reference signal (DMRS), etc. In addition, DMRS can also be referred to as a user terminal specific reference signal (UE-specific Reference Signal).

[0228] (Base station)

[0229] Figure 15 FIG. is an example showing the structure of a base station according to an embodiment. The base station 10 includes a control unit 110, a transmission / reception unit 120, a transmission / reception antenna 130, and a transmission path interface (transmission line interface) 140. In addition, one or more of the control unit 110, the transmission / reception unit 120, the transmission / reception antenna 130, and the transmission path interface 140 may be provided respectively.

[0230] In addition, in this example, the functional blocks of the characteristic parts in the present embodiment are mainly shown, and it can be assumed that the base station 10 also has other functional blocks required for wireless communication. A part of the processing of each unit described below may also be omitted.

[0231] The control unit 110 implements the overall control of the base station 10. The control unit 110 can be composed of a controller, a control circuit, etc. described based on the common knowledge in the technical field related to the present disclosure.

[0232] The control unit 110 may also control the generation, scheduling (e.g., resource allocation, mapping), etc. of signals. The control unit 110 may also control the transmission / reception, measurement, etc. using the transmission / reception unit 120, the transmission / reception antenna 130, and the transmission path interface 140. The control unit 110 may also generate data, control information, a sequence, etc. to be transmitted as signals, and forward them to the transmission / reception unit 120. The control unit 110 may also perform call processing (setting, releasing, etc.) of communication channels, state management of the base station 10, management of radio resources, etc.

[0233] The transmission and reception unit 120 may also include a baseband unit 121, a Radio Frequency (RF) unit 122, and a measurement unit 123. The baseband unit 121 may also include a transmission processing unit 1211 and a reception processing unit 1212. The transmission and reception unit 120 can be composed of a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter (phase shifter), a measurement circuit, a transmission and reception circuit, etc., which are described based on the common knowledge in the technical field related to the present disclosure.

[0234] The transmission and reception unit 120 may be configured as an integrated transmission and reception unit, or may be composed of a transmission unit and a reception unit. The transmission unit may also be composed of a transmission processing unit 1211 and an RF unit 122. The reception unit may also be composed of a reception processing unit 1212, an RF unit 122, and a measurement unit 123.

[0235] The transmission and reception antenna 130 can be composed of an antenna described based on the common knowledge in the technical field related to the present disclosure, such as an array antenna.

[0236] The transmission and reception unit 120 may also transmit the above-mentioned downlink channels, synchronization signals, downlink reference signals, etc. The transmission and reception unit 120 may also receive the above-mentioned uplink channels, uplink reference signals, etc.

[0237] The transmission and reception unit 120 may also use digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), etc. to form at least one of a transmission beam and a reception beam.

[0238] For example, the transmission and reception unit 120 (transmission processing unit 1211) may also perform processing of the Packet Data Convergence Protocol (PDCP) layer, processing of the Radio Link Control (RLC) layer (e.g., RLC retransmission control), processing of the Medium Access Control (MAC) layer (e.g., HARQ retransmission control), etc. on the data, control information, etc. obtained from the control unit 110, and generate a bit string to be transmitted.

[0239] The transmission / reception unit 120 (transmission processing unit 1211) can also perform transmission processing such as channel coding (which may also include error correction coding), modulation, mapping, filter processing (filtering), Discrete Fourier Transform (DFT) processing (if necessary), Inverse Fast Fourier Transform (IFFT) processing, precoding, digital-to-analog conversion, etc. on the bit string to be transmitted, and output a baseband signal.

[0240] The transmission / reception unit 120 (RF unit 122) can also perform modulation to the radio frequency band, filter processing, amplification, etc. on the baseband signal, and transmit the radio frequency band signal via the transmission / reception antenna 130.

[0241] On the other hand, the transmission / reception unit 120 (RF unit 122) can also perform amplification, filter processing, demodulation to the baseband signal, etc. on the radio frequency band signal received through the transmission / reception antenna 130.

[0242] The transmission / reception unit 120 (reception processing unit 1212) can also perform reception processing such as analog-to-digital conversion, Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing (if necessary), filter processing, demapping, demodulation, decoding (which may also include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing, etc. on the obtained baseband signal, and obtain user data, etc.

[0243] The transmission / reception unit 120 (measurement unit 123) may also perform measurements related to the received signal. For example, the measurement unit 123 may also perform radio resource management (RRM) measurements, channel state information (CSI) measurements, etc. based on the received signal. The measurement unit 123 may also perform measurements on received power (e.g., reference signal received power (RSRP)), received quality (e.g., reference signal received quality (RSRQ), signal to interference plus noise ratio (SINR), signal to noise ratio (SNR)), signal strength (e.g., received signal strength indicator (RSSI)), propagation path information (e.g., CSI), etc. The measurement results may also be output to the control unit 110.

[0244] The transmission path interface 140 may also transmit and receive signals (backhaul signaling) between the device included in the core network 30, other base stations 10, etc., and may also obtain and transmit user data (user plane data), control plane data, etc. for the user terminal 20.

[0245] In addition, the transmission unit and the reception unit of the base station 10 in the present disclosure may also be constituted by at least one of the transmission / reception unit 120, the transmission / reception antenna 130, and the transmission path interface 140.

[0246] The transmission / reception unit 120 may also transmit a medium access control-control element (MAC CE) related to the parameters for the sounding reference signal (SRS) resource set or SRS resources. The control unit 110 may also control SRS reception based on the parameters.

[0247] The transmission / reception unit 120 may also transmit a medium access control-control element (MAC CE) indicating a mapping between one or more values of parameters for a sounding reference signal (SRS) resource set or SRS resource and one or more values of fields within downlink control information, and transmit the downlink control information. The control unit 110 may also control SRS reception based on the parameters.

[0248] (User Equipment)

[0249] Figure 16 FIG. is an example showing the structure of a user equipment according to an embodiment. The user equipment 20 includes a control unit 210, a transmission / reception unit 220, and a transmission / reception antenna 230. Additionally, one or more of the control unit 210, the transmission / reception unit 220, and the transmission / reception antenna 230 may be provided respectively.

[0250] In addition, in this example, mainly the functional blocks of the characteristic parts in this embodiment are shown, and it can be assumed that the user equipment 20 also has other functional blocks required for wireless communication. A part of the processing of each unit described below may also be omitted.

[0251] The control unit 210 implements overall control of the user equipment 20. The control unit 210 may be constituted by a controller, a control circuit, etc. that are described based on common knowledge in the technical field related to the present disclosure.

[0252] The control unit 210 may also control signal generation, mapping, etc. The control unit 210 may also control transmission / reception, measurement, etc. using the transmission / reception unit 220 and the transmission / reception antenna 230. The control unit 210 may also generate data, control information, sequences, etc. to be transmitted as signals, and forward them to the transmission / reception unit 220.

[0253] The transmission / reception unit 220 may also include a baseband unit 221, an RF unit 222, and a measurement unit 223. The baseband unit 221 may also include a transmission processing unit 2211 and a reception processing unit 2212. The transmission / reception unit 220 may be constituted by a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmission / reception circuit, etc. that are described based on common knowledge in the technical field related to the present disclosure.

[0254] The transmission / reception unit 220 may be constituted as an integrated transmission / reception unit, or may be constituted by a transmission unit and a reception unit. The transmission unit may be constituted by the transmission processing unit 2211 and the RF unit 222. The reception unit may be constituted by the reception processing unit 2212, the RF unit 222, and the measurement unit 223.

[0255] The transmitting and receiving antenna 230 can be constituted by an antenna that can be described based on common knowledge in the technical field related to the present disclosure, such as an array antenna or the like.

[0256] The transmitting and receiving unit 220 can also receive the above-mentioned downlink channels, synchronization signals, downlink reference signals, etc. The transmitting and receiving unit 220 can also transmit the above-mentioned uplink channels, uplink reference signals, etc.

[0257] The transmitting and receiving unit 220 can also use digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), etc. to form at least one of a transmitting beam and a receiving beam.

[0258] The transmitting and receiving unit 220 (transmitting processing unit 2211) can also perform, for example, PDCP layer processing, RLC layer processing (e.g., RLC retransmission control), MAC layer processing (e.g., HARQ retransmission control), etc. on the data, control information, etc. obtained from the control unit 210, and generate a bit string to be transmitted.

[0259] The transmitting and receiving unit 220 (transmitting processing unit 2211) can also perform transmitting processing such as channel coding (which may include error correction coding), modulation, mapping, filter processing, DFT processing (if necessary), IFFT processing, precoding, digital-to-analog conversion, etc. on the bit string to be transmitted, and output a baseband signal.

[0260] In addition, regarding whether to apply DFT processing, it can also be based on the setting of transform precoding. For a certain channel (e.g., PUSCH), when transform precoding is effective (enabled), the transmitting and receiving unit 220 (transmitting processing unit 2211) can also perform DFT processing as the above-mentioned transmitting processing in order to transmit the channel using the DFT-s-OFDM waveform. In other cases, the transmitting and receiving unit 220 (transmitting processing unit 2211) can also not perform DFT processing as the above-mentioned transmitting processing.

[0261] The transmitting and receiving unit 220 (RF unit 222) can also perform modulation to a radio frequency band, filter processing, amplification, etc. on the baseband signal, and transmit the radio frequency band signal via the transmitting and receiving antenna 230.

[0262] On the other hand, the transmitting and receiving unit 220 (RF unit 222) can also perform amplification, filter processing, demodulation to a baseband signal, etc. on the radio frequency band signal received through the transmitting and receiving antenna 230.

[0263] The transmission / reception unit 220 (reception processing unit 2212) may also perform reception processing such as analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filter processing, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing on the obtained baseband signal, and obtain user data and the like.

[0264] The transmission / reception unit 220 (measurement unit 223) may also perform measurements related to the received signal. For example, the measurement unit 223 may also perform RRM measurements, CSI measurements, etc. based on the received signal. The measurement unit 223 may also measure reception power (e.g., RSRP), reception quality (e.g., RSRQ, SINR, SNR), signal strength (e.g., RSSI), propagation path information (e.g., CSI), etc. The measurement results may also be output to the control unit 210.

[0265] In addition, the transmission unit and reception unit of the user terminal 20 in the present disclosure may also be constituted by at least one of the transmission / reception unit 220 and the transmission / reception antenna 230.

[0266] The transmission / reception unit 220 may also receive a medium access control-control element (MAC CE) related to the parameters for a sounding reference signal (SRS) resource set or an SRS resource. The control unit 210 may also control SRS transmission based on the parameters.

[0267] The transmission / reception unit 220 may also receive a radio resource control information element indicating a plurality of SRS resource sets. The MAC CE may also activate one or more SRS resource sets among the plurality of SRS resource sets.

[0268] The transmission / reception unit 220 may also receive a radio resource control information element indicating the parameters. The MAC CE may also update the parameters.

[0269] The parameters may also be the time slot offset for the SRS resource set.

[0270] The transmission / reception unit 220 may also receive a medium access control-control element (MAC CE) indicating a mapping between one or more values of parameters for a sounding reference signal (SRS) resource set or SRS resource and one or more values of a field in downlink control information, and may also receive the downlink control information. The control unit 210 may also determine the value of the parameter based on the MAC CE and the downlink control information.

[0271] The parameter may also be at least one of an aperiodic SRS resource trigger and an SRS resource set.

[0272] The MAC CE may also represent a plurality of SRS resource sets. The plurality of values of the field may be mapped to the plurality of SRS resource sets.

[0273] The downlink control information may also be transmitted using at least one of a radio network temporary identifier for SRS and a downlink control information format for SRS.

[0274] (Hardware Structure)

[0275] In addition, the block diagrams used in the description of the above embodiments illustrate blocks of functional units. These functional blocks (structural units) are implemented by any combination of at least one of hardware and software. In addition, there is no particular limitation on the implementation method of each functional block. That is, each functional block may be implemented by a single device physically or logically combined, or may be implemented by two or more physically or logically separated devices directly or indirectly (e.g., by wire, wireless, etc.) connected. The functional block may also be implemented by combining the above single device or the above multiple devices with software.

[0276] Here, in terms of functions, there are judgment, decision-making, determination, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, solution, selection, selection, establishment, comparison, assumption, expectation, regarded as, broadcasting, notifying, communicating, forwarding, configuration (setting), reconfiguration (re - setting), allocation (allocating, mapping), assignment, etc., but not limited to these. For example, a functional block (structural unit) that implements the transmission function can also be referred to as a transmitting unit, a transmitter, etc. Any one of them is as described above, and the implementation method is not particularly limited.

[0277] For example, a base station, a user terminal, etc. in an embodiment of the present disclosure can also function as a computer for processing the wireless communication method of the present disclosure. Figure 17 FIG. is an example showing the hardware structure of a base station and a user terminal according to an embodiment. The above - mentioned base station 10 and user terminal 20 can also be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, etc.

[0278] In addition, in the present disclosure, terms such as device, circuit, equipment, section, unit, etc. can be replaced with each other. The hardware structure of the base station 10 and the user terminal 20 can be configured to include one or more of the devices shown in the figure, or can be configured not to include some of the devices.

[0279] For example, only one processor 1001 is shown in the figure, but there can be multiple processors. In addition, the processing can be executed by one processor, or can be executed simultaneously, sequentially, or by other means by two or more processors. In addition, the processor 1001 can also be implemented by more than one chip.

[0280] Regarding each function in the base station 10 and the user terminal 20, for example, by loading a specific software (program) onto hardware such as the processor 1001 and the memory 1002, the processor 1001 performs operations and controls communication via the communication device 1004, or controls at least one of reading and writing data in the memory 1002 and the storage 1003, thereby realizing the function.

[0281] The processor 1001, for example, operates the operating system to control the entire computer. The processor 1001 may also be constituted by a central processing unit (Central Processing Unit (CPU)) including an interface with peripheral devices, a control device, an arithmetic device, registers, etc. For example, at least a part of the above control unit 110 (210), transmission / reception unit 120 (220), etc. may also be implemented by the processor 1001.

[0282] In addition, the processor 1001 reads a program (program code), software module, data, etc. from at least one of the storage 1003 and the communication device 1004 into the memory 1002, and performs various processes based on them. As the program, a program that causes the computer to execute at least a part of the operations described in the above embodiments can be used. For example, the control unit 110 (210) may also be implemented by a control program stored in the memory 1002 and operating in the processor 1001, and the same can be applied to other functional blocks.

[0283] The memory 1002 may also be a computer-readable recording medium, and is constituted by, for example, at least one of a read-only memory (Read Only Memory (ROM)), an erasable programmable read-only memory (Erasable Programmable ROM (EPROM)), an electrically erasable programmable read-only memory (Electrically EPROM (EEPROM)), a random access memory (Random Access Memory (RAM)), and other appropriate storage media. The memory 1002 may also be referred to as a register, a cache, a main memory (main storage device), etc. The memory 1002 can store a program (program code), software module, etc. executable for implementing the wireless communication method according to an embodiment of the present disclosure.

[0284] The storage 1003 may also be a computer-readable recording medium, and is constituted by, for example, at least one of a flexible disc, a floppy (registered trademark) disc, an optical disc (e.g., a compact disc (Compact Disc ROM (CD-ROM)) etc.), a digital versatile disc, a Blu-ray (registered trademark) disc, a removable disc, a hard disk drive, a smart card, a flash device (e.g., a card, a stick, a key drive), a magnetic stripe, a database, a server, and other appropriate storage media. The storage 1003 may also be referred to as an auxiliary storage device.

[0285] The communication device 1004 is hardware (a transmitting and receiving device) for inter-computer communication 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. In order to implement at least one of, for example, Frequency Division Duplex (FDD) and Time Division Duplex (TDD), the communication device 1004 may also be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. For example, the above-mentioned transmitting and receiving unit 120 (220), the transmitting and receiving antenna 130 (230), etc. may also be implemented by the communication device 1004. The transmitting and receiving unit 120 (220) may also be physically or logically separated and implemented by a transmitting unit 120a (220a) and a receiving unit 120b (220b).

[0286] 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 an input from the outside. The output device 1006 is an output device (e.g., a display, a speaker, a Light Emitting Diode (LED) lamp, etc.) that performs an output to the outside. In addition, the input device 1005 and the output device 1006 may also have an integrated structure (e.g., a touch panel).

[0287] In addition, each device such as the processor 1001 and the memory 1002 is connected by a bus 1007 for communicating information. The bus 1007 may be constituted by a single bus or may be constituted by different buses between each device.

[0288] In addition, the base station 10 and the user terminal 20 may also 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), a Field Programmable Gate Array (FPGA), etc., and a part or all of each functional block may also be implemented by this hardware. For example, the processor 1001 may also be implemented using at least one of these hardwares.

[0289] (Variant example)

[0290] In addition, the terms described in this disclosure and the terms required for understanding this disclosure may also be replaced with terms having the same or similar meanings. For example, a channel, a symbol, and a signal (signal or signaling) may also be replaced with each other. In addition, a signal may also be a message. A reference signal can also be abbreviated as RS and may also be referred to as a pilot, a pilot signal, etc. according to the applied standard. In addition, a component carrier (Component Carrier (CC)) may also be referred to as a cell, a frequency carrier, a carrier frequency, etc.

[0291] A radio frame may also be composed of one or more periods (frames) in the time domain. Each of the one or more periods (frames) constituting the radio frame may also be referred to as a subframe. Further, a subframe may also be composed of one or more time slots in the time domain. A subframe may also be a fixed time length (e.g., 1 ms) independent of the numerology.

[0292] Here, the numerology may also be a communication parameter applied in at least one of the transmission and reception of a certain signal or channel. For example, the numerology may also represent at least one of a subcarrier spacing (SubCarrier Spacing (SCS)), a bandwidth, a symbol length, a cyclic prefix length, a transmission time interval (Transmission Time Interval (TTI)), the number of symbols per TTI, a radio frame structure, a specific filter process performed by a transmitter-receiver in the frequency domain, a specific windowing process performed by a transmitter-receiver in the time domain, etc.

[0293] A time slot may also be composed of one or more symbols (orthogonal frequency division multiplexing (Orthogonal Frequency Division Multiplexing (OFDM)) symbols, single carrier frequency division multiple access (Single Carrier Frequency Division Multiple Access (SC-FDMA)) symbols, etc.) in the time domain. In addition, a time slot may also be a time unit based on the numerology.

[0294] A time slot may also include a plurality of mini-slots. Each mini-slot may also be composed of one or more symbols in the time domain. In addition, a mini-slot may also be referred to as a sub-slot. A mini-slot may also be composed of a smaller number of symbols than a time slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a mini-slot may also be referred to as PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a mini-slot may also be referred to as PDSCH (PUSCH) mapping type B.

[0295] A radio frame, a subframe, a time slot, a mini-slot, and a symbol all represent time units for transmitting signals. A radio frame, a subframe, a time slot, a mini-slot, and a symbol may also use other corresponding names. In addition, time units such as frames, subframes, time slots, mini-slots, and symbols in the present disclosure can also be replaced with each other.

[0296] For example, a subframe may also be referred to as a TTI, multiple consecutive subframes may also be referred to as a TTI, a time slot or a mini-slot may also be referred to as a TTI. That is, at least one of a subframe and a TTI may be a subframe (1 ms) in existing LTE, may be a period shorter than 1 ms (e.g., 1 - 13 symbols), or may be a period longer than 1 ms. In addition, the unit representing a TTI may not be referred to as a subframe, but as a time slot, a mini-slot, etc.

[0297] Here, a TTI refers to, for example, the minimum time unit for scheduling in wireless communication. For example, in an LTE system, a base station performs scheduling to allocate radio resources (frequency bandwidth, transmission power, etc. that can be used in each user terminal) to each user terminal in units of TTI. In addition, the definition of a TTI is not limited to this.

[0298] A TTI may also be a transmission time unit for a data packet (transmission block), a code block, a codeword, etc. that has undergone channel coding, and may also become a processing unit for scheduling, link adaptation, etc. In addition, when a TTI is given, the time interval (e.g., the number of symbols) in which a transmission block, a code block, a codeword, etc. are actually mapped may be shorter than the TTI.

[0299] In addition, when a time slot or a mini-slot is referred to as a TTI, one or more TTIs (i.e., one or more time slots or one or more mini-slots) may also become the minimum time unit for scheduling. In addition, the number of time slots (mini-slot numbers) constituting the minimum time unit of this scheduling can also be controlled.

[0300] A TTI having a time length of 1 ms may also be referred to as a normal TTI (TTI in 3GPP Rel.8 - 12), a standard TTI, a long TTI, a normal subframe, a standard subframe, a long subframe, a time slot, etc. A TTI shorter than a normal TTI may also be referred to as a shortened TTI, a short TTI, a partial TTI, a shortened subframe, a short subframe, a mini-slot, a sub-time slot, a time slot, etc.

[0301] In addition, a long TTI (e.g., a normal TTI, a subframe, etc.) may be replaced with a TTI having a time length exceeding 1 ms, and a short TTI (e.g., a shortened TTI, etc.) may be replaced with a TTI having a TTI length less than that of the long TTI and 1 ms or more.

[0302] A resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and may also include one or more consecutive subcarriers (sub-carriers) in the frequency domain. The number of subcarriers included in an RB may also be the same regardless of the parameter set, for example, it may also be 12. The number of subcarriers included in an RB may also be determined based on the parameter set.

[0303] In addition, an RB may also include one or more symbols in the time domain, and may also be the length of a time slot, a mini-slot, a subframe, or a TTI. A TTI, a subframe, etc. may also be composed of one or more resource blocks respectively.

[0304] In addition, one or more RBs may also be referred to as a physical resource block (PRB), a sub-carrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, etc.

[0305] In addition, a resource block may also be composed of one or more resource elements (REs). For example, one RE may also be a radio resource area of a subcarrier and a symbol.

[0306] A bandwidth part (BWP) (which may also be referred to as a partial bandwidth, etc.) may also represent a subset of consecutive common RBs (common resource blocks) used for a certain parameter set in a certain carrier. Here, the common RBs may also be determined by the index of the RBs based on the common reference point of the carrier. A PRB may also be defined in a certain BWP and be additionally numbered within that BWP.

[0307] An UL BWP (BWP for UL) and a DL BWP (BWP for DL) may also be included in a BWP. For a UE, one or more BWPs may also be set within a carrier.

[0308] At least one of the set BWPs may also be active, and the UE may not assume to transmit and receive specific channels / signals outside the active BWP. In addition, "cell", "carrier", etc. in the present disclosure may also be replaced by "BWP".

[0309] In addition, structures such as the above-mentioned radio frames, subframes, time slots, mini time slots, and symbols are merely illustrative. For example, the number of subframes included in a radio frame, the number of time slots in each subframe or radio frame, the number of mini time slots included in a time slot, the symbols included in a time slot or mini time slot, the number of RBs, the number of subcarriers included in an RB, and the number of symbols, symbol length, Cyclic Prefix (CP) length, etc. within a TTI can be changed in various ways.

[0310] In addition, the information, parameters, etc. described in this disclosure can be represented by absolute values, relative values with respect to a specific value, or can also be represented by corresponding other information. For example, radio resources can also be indicated by a specific index.

[0311] In this disclosure, the names used for parameters, etc. are not restrictive names in all aspects. Furthermore, mathematical formulas, etc. using these parameters can also be different from those clearly disclosed in this disclosure. Various channels (PUCCH, PDCCH, etc.) and information elements can be identified by any suitable name. Therefore, the various names assigned to these various channels and information elements are not restrictive names in all aspects.

[0312] The information, signals, etc. described in this disclosure can also be represented using any one of various different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be mentioned throughout the above description can also be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0313] In addition, information, signals, etc. can be output in at least one of the following directions: from a higher layer to a lower layer, and from a lower layer to a higher layer. Information, signals, etc. can also be input and output via multiple network nodes.

[0314] The input and output information, signals, etc. can be stored in a specific location (e.g., a memory), or can be managed using a management table. The input and output information, signals, etc. can be overwritten, updated, or appended. The output information, signals, etc. can also be deleted. The input information, signals, etc. can also be sent to other devices.

[0315] Notification of information is not limited to the manner / embodiment described in this disclosure and can also be carried out by other methods. For example, notification of information in this disclosure can also be implemented through physical layer signaling (e.g., downlink control information (Downlink Control Information (DCI)), uplink control information (Uplink Control Information (UCI))), higher layer signaling (e.g., Radio Resource Control (RRC) signaling, broadcast information (Master Information Block (MIB), System Information Block (SIB), etc.), Medium Access Control (MAC) signaling), other signals, or a combination thereof.

[0316] In addition, physical layer signaling can also be referred to as Layer 1 / Layer 2 (L1 / L2) control information (L1 / L2 control signal), L1 control information (L1 control signal), etc. Furthermore, RRC signaling can also be referred to as an RRC message, and for example, it can also be an RRC Connection Setup message, an RRC Connection Reconfiguration (RRC Connection Re - setting) message, etc. In addition, MAC signaling can also be notified, for example, by using a MAC Control Element (MAC CE).

[0317] In addition, notification of specific information (e.g., notification of "is X") is not limited to explicit notification and can also be carried out implicitly (e.g., by not making the notification of the specific information or by making the notification of other information).

[0318] The determination can be made by a value represented by one bit (0 or 1), can also be made by a true / false value (boolean value) represented by true or false, and can also be made by a numerical comparison (e.g., comparison with a specific value).

[0319] Software, whether referred to as software, firmware, middleware, micro-code, hardware description language, or by any other name, should be broadly construed to mean instructions, instruction sets, code, code segments, program code, programs, sub-programs, software modules, applications, software applications, software packages, routines, sub-routines, objects, executable files, execution threads, procedures, functions, etc.

[0320] In addition, software, instructions, information, etc. can also be sent and received via a transmission medium. For example, in the case of sending software from a website, server, or other remote source using at least one of wired technologies (coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), etc.) and wireless technologies (infrared, microwave, etc.), at least one of these wired and wireless technologies is included in the definition of the transmission medium.

[0321] Terms such as "system" and "network" used in this disclosure can be used interchangeably. "Network" can also mean a device (e.g., a base station) included in the network.

[0322] In this disclosure, terms such as "precoding", "precoder", "weights (precoding weights)", "Quasi-Co-Location (QCL)", "Transmission Configuration Indication state (TCI state)", "spatial relation", "spatial domain filter", "transmission power", "phase rotation", "antenna port", "antenna port group", "layer", "number of layers", "rank", "resource", "resource set", "resource group", "beam", "beam width", "beam angle", "antenna", "antenna element", "panel", etc. can be used interchangeably.

[0323] In the present disclosure, terms such as "Base Station (BS)", "radio base station", "fixed station", "NodeB", "eNB (eNodeB)", "gNB (gNodeB)", "access point", "Transmission Point (TP)", "Reception Point (RP)", "Transmission / Reception Point (TRP)", "panel", "cell", "sector", "cell group", "carrier", and "component carrier" can be used interchangeably. There are also cases where base stations are referred to by terms such as macro cell, small cell, femto cell, and pico cell.

[0324] A base station can accommodate one or more (e.g., three) cells. When a base station accommodates multiple cells, the overall coverage area of the base station can be divided into multiple smaller areas, and each of these smaller areas can also provide communication services through a base station subsystem (e.g., a small indoor base station (Remote Radio Head (RRH))). Terms such as "cell" or "sector" refer to a part or the whole of the coverage area of at least one of the base station and the base station subsystem that provides communication services within that coverage range.

[0325] In the present disclosure, terms such as "Mobile Station (MS)", "user terminal", "user device (User Equipment (UE))", and "terminal" can be used interchangeably.

[0326] There are also cases where mobile stations are referred to by terms such as subscriber station, mobile unit, subscriber unit, radio unit, remote unit, mobile device, radio device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, hand set, user agent, mobile client, client, or several other suitable terms.

[0327] At least one of the base station and the mobile station may also be referred to as a transmitting device, a receiving device, a wireless communication device, etc. Additionally, at least one of the base station and the mobile station may also be a device mounted on a moving body, the moving body itself, etc. The moving body may be a transportation vehicle (e.g., a vehicle, an airplane, etc.), a moving body that moves in an unmanned manner (e.g., a drone, a self-driving vehicle, etc.), or a robot (humanoid or non-humanoid). Additionally, at least one of the base station and the mobile station also includes a device that does not necessarily move during communication operations. For example, at least one of the base station and the mobile station may also be an Internet of Things (IoT) device such as a sensor.

[0328] Furthermore, the base station in the present disclosure may also be replaced by a user terminal. For example, for a structure in which communication between a base station and a user terminal is replaced by communication between multiple user terminals (e.g., it may also be referred to as Device-to-Device (D2D), Vehicle-to-Everything (V2X), etc.), the various aspects / embodiments of the present disclosure may also be applied. In this case, it may also be configured such that the user terminal 20 has the functions of the above-mentioned base station 10. Additionally, terms such as "uplink" and "downlink" may also be replaced by terms corresponding to inter-terminal communication (e.g., "side"). For example, an uplink channel, a downlink channel, etc. may also be replaced by a side channel.

[0329] Similarly, the user terminal in the present disclosure may also be replaced by a base station. In this case, it may also be configured such that the base station 10 has the functions of the above-mentioned user terminal 20.

[0330] In the present disclosure, an action performed by the base station may sometimes be performed by its upper node according to circumstances. Apparently, in a network including one or more network nodes having a base station, various operations for communication with a terminal may be performed by the base station, one or more network nodes other than the base station (e.g., considering a Mobility Management Entity (MME), a Serving-Gateway (S-GW), etc., but not limited to these), or a combination thereof.

[0331] Each mode / embodiment described in the present disclosure can be used alone, in combination, or switched during execution. In addition, the processing procedures, sequences, flowcharts, etc. of each mode / embodiment described in the present disclosure can be reordered as long as there is no contradiction. For example, for the methods described in the present disclosure, the elements of various steps are presented in an exemplary order, but are not limited to the specific order presented.

[0332] Each mode / embodiment described in the present disclosure can also be applied to Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), 6th generation mobile communication system (6G), xth generation mobile communication system (xG) (x is an integer or a decimal, for example), Future Radio Access (FRA), New-Radio Access Technology (RAT), New Radio (NR), New radio access (NX), Future generation radio access (FX), Global System for Mobile communications (GSM (registered trademark)), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), systems using other appropriate wireless communication methods, next-generation systems extended based on them, etc. In addition, multiple systems can also be combined (for example, a combination of LTE or LTE-A and 5G) and applied.

[0333] The phrase “based on” used in the present disclosure does not mean “based only on” unless otherwise specified. In other words, the phrase “based on” means both “based only on” and “based at least on”.

[0334] Any reference to an element using the terms "first", "second", etc. used in this disclosure does not fully define the amount or order of these elements. These terms can be used in this disclosure as a convenient method to distinguish between two or more elements. Therefore, reference to the first and second elements does not mean that only two elements can be used or that the first element must take precedence over the second element in some form.

[0335] The term "determining" used in this disclosure may include a variety of actions. For example, "determining" may also refer to situations where judging, calculating, computing, processing, deriving, investigating, looking up (e.g., searching in a table, database or other data structure), ascertaining, etc. are considered to be "determining".

[0336] In addition, "judgment (decision)" may also be a situation where receiving (for example, receiving information), sending (for example, sending information), input (input), output (output), accessing (for example, accessing data in a memory), etc. are regarded as making a "judgment (decision)".

[0337] In addition, "judgment (decision)" can also be regarded as a situation where resolving, selecting, choosing, establishing, comparing, etc. are regarded as a situation where "judgment (decision)" is performed. That is, "judgment (decision)" can also be regarded as a situation where some actions are regarded as a situation where "judgment (decision)" is performed.

[0338] In addition, “judgment (decision)” can also be replaced by “assuming (assuming)”, “expecting (expecting)”, “considering (considering)” and so on.

[0339] As used in this disclosure, the terms "connected" and "coupled" and all variations thereof mean all direct or indirect connections or couplings between two or more elements, and can include the situation where there is one or more intermediate elements between the two elements that are "connected" or "coupled" to each other. The coupling or connection between elements can be physical, logical, or a combination of them. For example, "connected" can also be replaced with "access".

[0340] In this disclosure, when two elements are connected, it is possible to consider using one or more wires, cables, printed electrical connections, etc., and electromagnetic energy having wavelengths in the radio frequency domain, microwave region, and optical (both visible and invisible) regions, etc., as several non-limiting and non-exhaustive examples, and being "connected" or "coupled" to each other.

[0341] In this disclosure, the term "A is different from B" can also mean "A and B are different from each other". In addition, this term can also mean "A and B are respectively different from C". Terms such as "separated" and "combined" can also be interpreted in the same way as "different".

[0342] When the terms "include", "including", and their variations are used in this disclosure, these terms, like the term "comprising", are meant in an inclusive sense. Furthermore, the term "or" used in this disclosure does not mean the exclusive or.

[0343] In this disclosure, for example, in the case where articles are added through translation such as a, an, and the in English, this disclosure can also include the case where the nouns following these articles are in the plural form.

[0344] As described above, the invention related to this disclosure has been described in detail, but for those skilled in the art, the invention related to this disclosure is obviously not limited to the embodiments described in this disclosure. The invention related to this disclosure can be implemented in the form of amendments and variations without departing from the gist and scope of the invention determined based on the description in the claims. Therefore, the description of this disclosure is for illustrative purposes and does not carry any restrictive meaning for the invention related to this disclosure.

Claims

1. A terminal, comprising: a receiving unit that receives a setting of a plurality of values of a time slot offset for an aperiodic sounding reference signal resource set, i.e., an SRS resource set, and receives downlink control information indicating one of the plurality of values; and a control unit that determines a time slot for transmitting an aperiodic SRS in the SRS resource set based on the setting and the downlink control information.

2. The terminal according to claim 1, wherein irrespective of the scheduling of the physical uplink shared channel and the scheduling of the physical downlink shared channel, the downlink control information triggers the aperiodic SRS.

3. A wireless communication method of a terminal, comprising: a step of receiving a setting of a plurality of values of a time slot offset for an aperiodic sounding reference signal resource set, i.e., an SRS resource set; a step of receiving downlink control information indicating one of the plurality of values; and a step of determining a time slot for transmitting an aperiodic SRS in the SRS resource set based on the setting and the downlink control information.

4. A base station, comprising: a transmitting unit that transmits a setting of a plurality of values of a time slot offset for an aperiodic sounding reference signal resource set, i.e., an SRS resource set, and transmits downlink control information indicating one of the plurality of values; and a control unit that controls the reception of an aperiodic SRS in the SRS resource set, wherein the time slot for transmitting the aperiodic SRS is based on the setting and the downlink control information.

5. A system having a terminal and a base station, wherein the terminal comprises: a receiving unit that receives a setting of a plurality of values of a time slot offset for an aperiodic sounding reference signal resource set, i.e., an SRS resource set, and receives downlink control information indicating one of the plurality of values; and a control unit that determines a time slot for transmitting an aperiodic SRS in the SRS resource set based on the setting and the downlink control information, and the base station has a transmitting unit that transmits the setting and the downlink control information.

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