Terminal, wireless communication method, and base station

Abstract

A terminal according to one embodiment of the present disclosure includes: a receiving unit configured to receive a Media Access Control Element (MAC CE) related to parameters for a Sounding Reference Signal Resource Set (SRS) resource set or SRS resource; and a control unit configured to control SRS transmission based on the parameters. According to one embodiment of the present disclosure, SRS parameters can be flexibly controlled.

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 the Universal Mobile Telecommunications System (UMTS) network, Long Term Evolution (LTE) has been standardized to achieve even higher data rates and lower latency (Non-Patent Document 1). Furthermore, LTE-Advanced (3GPP Rel. 10-14) has been standardized to further enhance the capacity and sophistication of LTE (Third Generation Partnership Project (3GPP) Releases (Rel.) 8 and 9).

[0003] Successor systems to LTE (e.g., also known as the fifth generation mobile communication system (5G), 5G+ (plus), the sixth generation mobile communication system (6G), New Radio (NR), 3GPP Rel. 15 and later, etc.) are also being studied.

[0004] Prior art literature

[0005] Non-patent literature

[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 Sounding Reference Signal (SRS) has a variety of uses. NR's SRS is used not only for uplink (UL) CSI measurement, but also for downlink (DL) CSI measurement and beam management.

[0009] However, no research has been conducted on flexibly controlling the parameters of the SRS. If the parameters of the SRS cannot be flexibly set, there is a concern that resource utilization efficiency, communication throughput, communication quality, etc. may be degraded.

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

[0011] Means for solving problems

[0012] A terminal according to one embodiment of the present disclosure includes: a receiving unit for receiving a medium access control element (MAC CE) related to parameters for a sounding reference signal resource set (SRS resource set) or an SRS resource; and a control unit for controlling SRS transmission based on the parameters.

[0013] Effects of the Invention

[0014] According to one aspect of the present disclosure, SRS parameters can be flexibly controlled. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0017] Figure 3 This is a diagram showing an example of MAC CE 1 according to the first embodiment.

[0018] Figure 4A as well as Figure 4B This is a diagram showing an example of changes in MAC CE1 according to the first embodiment.

[0019] Figure 5A as well as Figure 5B This is a diagram showing an example of MAC CE 2 according to the first embodiment.

[0020] Figure 6A as well as Figure 6BThis is a diagram showing an example of a MAC CE for activation / deactivation of an SRS resource set according to the third embodiment.

[0021] Figure 7A as well as Figure 7B This is a diagram showing an example of a MAC CE for mapping the value of the SRS request field and specific parameters according to the third embodiment.

[0022] Figure 8A as well as Figure 8B This is a diagram showing an example of Change 1 of the MAC CE for mapping the value of the SRS request field and specific parameters according to the third embodiment.

[0023] Figure 9A as well as Figure 9B This is a diagram showing an example of Change 2 of the MAC CE for mapping the value of the SRS request field and specific parameters according to the third embodiment.

[0024] Figure 10 This is a diagram showing an example of a MAC CE indicating an A-SRS resource trigger according to the third embodiment.

[0025] Figure 11 This is a diagram showing an example of Option 1 of Variation 3 of the fourth embodiment.

[0026] Figure 12 This is a diagram showing an example of Option 2 of Variation 3 of the fourth embodiment.

[0027] Figure 13 This is a diagram showing an example of Option 3 of Variation 3 of the fourth embodiment.

[0028] Figure 14 This is a diagram showing an example of a schematic configuration of a wireless communication system according to an embodiment.

[0029] Figure 15 This is a diagram showing an example of the configuration of a base station according to one embodiment.

[0030] Figure 16 This is a diagram showing an example of the configuration of a user terminal according to an embodiment.

[0031] Figure 17 This is a diagram showing an example of the hardware configuration of a base station and a user terminal according to one embodiment. DETAILED DESCRIPTION

[0032] (SRS)

[0033] In NR, the Sounding Reference Signal (SRS) is used for a variety of purposes. NR's SRS is used not only for uplink (UL) CSI measurement, which is also used in existing LTE (LTE Rel. 8-14), but also for downlink (DL) CSI measurement and beam management.

[0034] The UE may also be configured with one or more SRS resources. The SRS resources may also be identified by an SRS Resource Index (SRI).

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

[0036] The UE may also be configured with one or more SRS resource sets. An SRS resource set may also be associated with a specific number of SRS resources. Regarding the SRS resources included in an SRS resource set, the UE may also use higher-layer parameters in common. Furthermore, the term "resource set" in this disclosure may also be replaced with "set," "resource group," "group," etc.

[0037] Information related to SRS resources or resource sets may also be set to the UE using higher layer signaling, physical layer signaling, or a combination thereof.

[0038] In addition, in the present disclosure, the higher layer signaling may be, for example, any one of Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, or a combination thereof.

[0039] MAC signaling may also use, for example, MAC Control Element (MAC CE) and MAC Protocol Data Unit (MAC PDU). Broadcast information may also include, for example, Master Information Block (MIB), System Information Block (SIB), minimum system information (Remaining Minimum System Information (RMSI)), and Other System Information (OSI).

[0040] The physical layer signaling may be, for example, downlink control information (Downlink Control Information (DCI))).

[0041] The SRS configuration information (eg, "SRS-Config" of the RRC information element) may also include SRS resource set configuration information, SRS resource configuration information, and the like.

[0042] The SRS resource set setting information (for example, the RRC parameter "SRS-ResourceSet") may also include the SRS resource set ID (Identifier) (SRS-ResourceSetId), a list of SRS resource IDs (SRS-ResourceId) used in the resource set, the SRS resource type (resourceType), and information on the usage of the SRS.

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

[0044] Furthermore, the usage of SRS (RRC parameter "usage", L1 (Layer-1) parameter "SRS-SetUse") may include, for example, beam management, codebook (CB), non-codebook (NCB), antenna switching, etc. For example, SRS for codebook or non-codebook purposes may be used to determine the precoder for transmission on a codebook-based or non-codebook-based uplink shared channel (Physical Uplink Shared Channel (PUSCH)) based on SRI.

[0045] For beam management purposes, it is also possible to assume that only one SRS resource per SRS resource set can be transmitted at a specific time. Furthermore, if multiple SRS resources corresponding to the same time domain within 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 the RRC parameter) can also include SRS resource ID (SRS-ResourceId), number of SRS ports, SRS port number, sending comb, SRS resource mapping (for example, time and / or frequency resource location, resource offset, resource period, number of repetitions, number of SRS code elements, SRS bandwidth, etc.), jump association information, SRS resource type, sequence ID, spatial relationship information, etc.

[0047] The UE may switch the bandwidth part (BWP) for transmitting the SRS for each time slot, or may switch antennas. In addition, the UE may apply at least one of intra-slot hopping and inter-slot hopping to SRS transmission.

[0048] (A-SRS trigger)

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

[0050] like Figure 1 As in the example of , among the values (code points) of the 2-bit SRS request field, 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. Figure 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 one or more SRS resource sets.

[0052] The time between triggering of A-SRS and transmission of SRS is a 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. If the slot offset is not set, the UE applies no offset (value 0). The A-SRS resource trigger list contains one or more A-SRS resource trigger (aperiodicSRS-ResourceTrigger) information elements (status, ID). The A-SRS resource trigger indicates the DCI code point for transmitting the SRS in accordance with the SRS resource set setting containing the A-SRS resource trigger.

[0054] It is preferable to improve the flexibility of SRS parameters. For example, in order to enable a large number of UEs to send SRS in the same UL time slot and distribute the PDCCH load, it is preferable to improve the flexibility of A-SRS triggering so that their triggering grants to UEs (DCI containing the SRS request field, PDCCH) are sent in multiple DL time slots.

[0055] If the flexibility of SRS parameters is not improved, there is a concern that resource utilization efficiency, communication throughput, communication quality, and the like may be deteriorated.

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

[0057] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. The wireless communication methods according to the respective embodiments may be applied individually or in combination.

[0058] In the present disclosure, "A / B" and "at least one of A and B" may be used interchangeably. In the present disclosure, cell, serving cell, CC, carrier, BWP, DL BWP, UL BWP, activated DL BWP, activated UL BWP, and band may be used interchangeably. In the present disclosure, index, ID, indicator, and resource ID may be used interchangeably. In the present disclosure, RRC, RRC parameter, RRC message, higher layer parameter, information element (IE), and setting may be used interchangeably. In the present disclosure, support, control, controllable, operate, and operable may be used interchangeably. In the present disclosure, sequence, list, set, and group may be used interchangeably. In the present disclosure, mapping, association, relationship, and table may be used interchangeably.

[0059] In the present disclosure, activate, update, indicate, enable, and specify may be used interchangeably.

[0060] In the present disclosure, MAC CE, update command, and activation / deactivation command may also be interchangeable.

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

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

[0063] In the following embodiments, SRS resource sets / SRS resources may also be interchangeable with SRS resource sets / SRS resources for specific purposes (e.g., codebook, non-codebook, beam management), SRS resource sets / SRS resources for the same purposes, and the like.

[0064] (Wireless Communication Method)

[0065] <First embodiment>

[0066] The specific parameters configured for (each) SRS resource set or the SRS resource set may also be controlled by the MAC CE. The specific parameters may be configured for each SRS resource set by RRC or for each SRS resource by RRC.

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

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

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

[0070] [Notification method 1]

[0071] The value of a specific parameter can also be set via RRC and overwritten via MAC CE. The RRC parameters used to set the specific parameter can also be the same as those used in Rel.15 / 16. A new MAC CE can also be introduced to update the value of the specific parameter.

[0072] [Notification method 2]

[0073] A list containing multiple values (candidates) for a specific parameter can also be set via RRC, and the values (indexes) within the list can be specified via MAC CE. The RRC parameters used to set the specific parameter can also be different from those used in 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 a specific parameter may not be set through RRC. The value of a specific parameter may also be specified (directly) through a MAC CE. The RRC parameter for setting the specific parameter may also be an optional field of Rel.15 / 16. A new MAC CE for specifying the value of the specific parameter may also be introduced. If the RRC parameter for setting the specific parameter is not set, the value of the specific parameter may also be 0 (which may also be regarded as 0 (no offset)).

[0076] The new MAC CE may also be any one of the following MAC CEs 1 and 2.

[0077] MAC CE1

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

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

[0080] exist Figure 3 In the example of [ ], the new MAC CE may also include at least one of a reserved (R) field (reserved bit), a serving cell ID field, a BWP ID field, an SRS resource set ID field, and a slot offset field. When the slot offset value is 0 to 32, the slot offset field may also be 6 bits in size. In Rel. 15, if the slot offset is not set, the slot offset value is 0. In this example, if the slot offset is not set, the slot offset value may also be a value notified through the MAC CE.

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

[0082] [Change 1]

[0083] The size of the slot offset field can also be less than 6 bits. Figure 4A As in the example of , the size of the slot offset field may be 4 bits, and the value of the slot offset notified through the MAC CE may be 0 to 15. This can reduce the number of octets (overhead) of the MAC CE.

[0084] [Change 2]

[0085] The size of the slot offset field can also be variable. The size of the slot offset field can also be based on RRC parameters. Figure 4B In the example shown in FIG5 , the number of bits used in the Slot Offset field in octet 3 is variable.

[0086] An RRC parameter that determines the size (number of bits) of the Slot Offset field may also be configured. The RRC parameter may also indicate the maximum value of the slot format indicated by the MAC CE. For example, if the RRC parameter indicates 15, a value between 0 and 15 may be indicated by the MAC CE, and the size of the Slot Offset field may also be 4 bits.

[0087] The RRC parameter may also indicate the minimum value of the slot format indicated by the MAC CE. The maximum value of the slot format indicated by the MAC CE may also be specified in the specification. For example, if the RRC parameter indicates 15 and the maximum value is 32, a value between 15 and 32 may also be indicated by the MAC CE, and the size of the slot offset field may also be 5 bits.

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

[0089] MAC CE2

[0090] The new MAC CE may also update / indicate / notify specific parameters within the SRS resource set. One or more candidates of the specific parameters notified through the MAC CE may also be set through RRC parameters.

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

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

[0093] The RRC parameter may also be a sequence (list) of candidates for a specific parameter, and a value in the list may also be notified via a MAC CE.

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

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

[0096] <Second embodiment>

[0097] Specific parameters set for (each) SRS resource set or SRS resource may also be controlled through at least one of MAC CE and DCI.

[0098] A value of a specific parameter may also be notified 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 the SRS (eg, a time slot offset).

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

[0101] [Notification method 4]

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

[0103] A new field (DCI field) may be defined / added within the DCI to indicate a specific parameter. If new RRC parameters (e.g., Rel.17 RRC parameters) are configured, the new DCI field may be present within the DCI. Otherwise, the new DCI field may not be present within the DCI.

[0104] Regarding specific parameters, new parameter values can also be notified through existing DCI fields (of Rel. 15 / 16), thereby minimizing changes to the specifications.

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

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

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

[0108] The number of SRS resource sets that can be set

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

[0110] When no new RRC parameters are set for SRS resource sets used for codebook transmission, non-codebook transmission, or antenna switching, the restriction on the number (maximum number) of configurable SRS resource sets in Rel. 15 / 16 may be applied.

[0111] When the new RRC parameters are configured, the number of SRS resource sets that can be configured may be greater than the 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 codepoint in the SRS request field within the DCI may be the maximum number of SRS resource sets that can be configured in Rel. 15 / 16. One codepoint in the SRS request field may also be a value (ID) of the A-SRS resource trigger (aperiodicSRSResourceTrigger) configured through higher-layer signaling.

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

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

[0114] <Third embodiment>

[0115] The specific parameter may also be an SRS resource set or an A-SRS resource trigger.

[0116] Activation / Deactivation of SRS Resource Sets

[0117] Multiple SRS resource sets may also be configured via RRC, and some of the multiple SRS resource sets may be activated / deactivated via MAC CE. The aforementioned limit on the number of SRS resource sets may also apply to the number of activated SRS resource sets.

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

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

[0120] like Figure 6B As in the example, MAC CE may also include an R field, a serving cell ID field, a BWP ID field, a B x At least one of the fields. B x The field can also be a bitmap. Multiple SRS resource sets can also be activated at the same time. The association between the value of x and the SRS resource set ID can also be set through high-level signaling. The value of x can also be associated with the ascending order of the SRS resource set ID. x The field may also span multiple octets depending on the number of SRS resource sets configured by higher layer signaling. The number of octets may also be variable depending on the number of SRS resource sets configured by higher layer signaling. x The order of the fields can be either ascending or descending order of x.

[0121] SRS resource set ID or A-SRS resource trigger value

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

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

[0124] The UE receiving the MAC CE may determine the SRS resource set or A-SRS resource trigger value corresponding to the value of the SRS request field based on the correspondence relationship represented by the MAC CE rather than the table specified in Rel.15 / 16.

[0125] like Figure 7B As in the example, the new MAC CE may also include an R field, a serving cell ID field, a BWP ID field, a B yx At least one of the fields. B yx The field can also be a bitmap. Multiple SRS resource sets can also be activated at the same time. The association between the values of y and x and the SRS resource set ID can also be set through high-layer signaling. yx The field can also be associated with the yth SRS resource set ID. The value of x can also be associated with the ascending order of the SRS resource set ID. The value of y can also be associated with the ascending order of the SRS resource set ID. yx The field may also span multiple octets depending on the number of SRS resource sets configured by higher layer signaling. The number of octets may also be variable depending on the number of SRS resource sets configured by higher layer signaling. yx The order of the fields can be either ascending or descending of x, or ascending or descending of y.

[0126] In this example, the position of a bit set to 1 within octet 2 can also represent the first SRS resource set ID (corresponding to the value 01 of the SRS request field), the position of a bit set to 1 within octet 3 can also represent the second SRS resource set ID (corresponding to the value 10 of the SRS request field), and the position of a bit set to 1 within octet 4 can also 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] like Figure 8A As in the example, the new MAC CE may also include an R field, a serving cell ID field, a BWP ID field, a T i Field, B x At least one of the fields. i Fields can also be combined with multiple B x Fields can also be associated in T i If the field is set to 1, the following seven B xField exists. It can also be used in T i If the field is set to 0, the following seven B x Field does not exist.

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

[0131] [Change 2]

[0132] One or more SRS resource set ID lists may also be configured via RRC. The SRS resource set ID list may also include one or more groups of SRS resource sets. A group may also include one or more SRS resources. An index (list index, group index) may also be associated with each group. The list index may also be notified via MAC CE.

[0133] like Figure 9A As in the example of FIG, an SRS resource set ID list including four groups is configured by RRC. The four groups correspond to list indexes 0 to 3, respectively.

[0134] like Figure 9B As in the example, the new MAC CE may also include an R field, a serving cell ID field, a BWP ID field, a T i At least one of the fields or list index fields. i Fields can also be associated with a list index field. i When the field is set to 1, a list index field exists after it. i When a field is set to 0, the next list index field does not exist.

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

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

[0137] 《Values triggered by A-SRS resources》

[0138] The value of the A-SRS resource trigger of the SRS resource set (A-SRS resource trigger ID, for example, any one of 1, 2, and 3) 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, and the existing relationship (table) between the value of the SRS request field and the SRS resource set may be applied.

[0140] The same A-SRS resource trigger value may be set for multiple SRS resource sets (especially when the purpose is antenna switching).

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

[0142] [Operation 1]

[0143] The value of the A-SRS resource trigger may be updated only for the SRS resource set notified via the MAC CE. This allows the value of the A-SRS resource trigger to be flexibly indicated via the MAC CE.

[0144] [Operation 2]

[0145] When the value of the A-SRS resource trigger is notified via MAC CE, the value of the A-SRS resource trigger of all SRS resource sets set to the same value as the A-SRS resource trigger before notification may be updated. This can reduce the overhead of MAC CE.

[0146] The combination of SRS resource sets updated by one MAC CE may also be configured by a higher-layer parameter (eg, an applicable SRS resource set list), and operation 2 may be performed only when the higher-layer parameter is configured.

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

[0148] like Figure 10 In that case, the new MAC CE may also include at least one of the R field, the serving cell ID field, the BWP ID field, the SRS resource set ID, and the A-SRS resource trigger ID field.

[0149] The A-SRS Resource Trigger ID field can also overwrite the value set by RRC. An A-SRS Resource Trigger ID list can also be set by RRC, and the index (position) within the list is specified by the A-SRS Resource Trigger ID field of the MAC CE. If an A-SRS Resource Trigger ID is not notified via RRC, notification using the A-SRS Resource Trigger ID of the MAC CE can also be applied.

[0150] Triggering DCI

[0151] The SRS request field that triggers A-SRS may not be included in the UL grant (UL DCI) / DL assignment (DL DCI).

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

[0153] If conditions are met, the SRS request field included in the UL / DL DCI can also be used to select SRS resource set / SRS resource parameters. This condition can also be the reception of specific RRC parameters. This allows for more flexible control of A-SRS without changing the existing DCI field size.

[0154] A new radio network temporary identifier (RNTI) (e.g., SRS-RNTI) may also be specified for triggering A-SRS. DCI with a cyclic redundancy check (CRC) scrambled by the SRS-RNTI may also be used only for triggering A-SRS (or not for scheduling). Specifying a new RNTI can prevent an increase in the number of blind detections compared to specifying a new DCI format.

[0155] A new DCI format for triggering of A-SRS may also be specified.

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

[0157] Alternatively, fields other than the SRS request field can be replaced with a structure that triggers SRS using the SRS request field to select SRS resource set / SRS resource parameters. The existing SRS request field value of 00 indicates that SRS is not triggered. A DCI with a CRC scrambled by the SRS-RNTI does not need to be in the SRS-not-triggered state. A value of 00 in the SRS request field within a DCI with a CRC scrambled by the SRS-RNTI can also be associated with an SRS resource set.

[0158] The size of the SRS request field in the DCI having the CRC scrambled by the SRS-RNTI is not limited to 2 bits or 3 bits, but may be 4 bits or more.

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

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

[0161] Multiple values (candidates) of the time slot offset may also be notified through RRC / MAC CE, and there may be a DCI field indicating one of these multiple values. The UE transmits the A-SRS using the time slot offset indicated by this field.

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

[0163] <Fourth embodiment>

[0164] Change 1

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

[0166] Changes 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 indicate the number (maximum number) of SRS resource sets / SRS resources that can be controlled by at least one MAC CE / DCI of the first to third embodiments.

[0171] At least one of the first to third embodiments may be applied only when the corresponding higher layer parameters are configured for the UE. Otherwise, the UE may apply the operations of Rel. 15 / 16.

[0172] Changes 3

[0173] In order to improve the flexibility of A-SRS, at least one of the following extensions 1 and 2 may be considered.

[0174] [Extension 1]

[0175] Import the extension of MAC CE. The 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, or may activate only one SRS resource set triggered by the SRS request field in the DCI.

[0178] like Figure 11 As in the example of , in Rel. 15 / 16, SRS resource set #1 is configured for codebook use. In Option 1, SRS resource sets #1 and #2 may be configured for codebook use, and SRS resource set #2 may be activated by 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] like 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 the MAC CE may also be associated with a value other than 00 in the 2-bit SRS request field.

[0182] [[Option 3]]

[0183] The MAC CE may also update a specific parameter of the SRS, such as a time slot offset.

[0184] like Figure 13 As in the example of , in Rel. 15 / 16, SRS resource set #1 having codebook usage and slot offset = 1 is set. In option 3, the slot offset of SRS resource set #1 can also be updated through MAC CE.

[0185] In option 1 / 2, the number (maximum number) of SRS resource sets that can be set for the assigned application increases.

[0186] [Extension 2]

[0187] Trigger the extension of DCI.

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

[0189] A new DCI field may be added based on the SRS request field.

[0190] A new RNTI (eg, SRS-RNTI) may be imported for generating DCI dedicated for A-SRS triggering.

[0191] A new DCI format for creating DCI dedicated to A-SRS triggering may also be imported.

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

[0193] Changes 4

[0194] A MAC CE activation time may also be required for a MAC CE to which at least one of the first to third embodiments is applied.

[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 resources (parameters) updated by the MAC CE for SRS transmission triggered by DCI received after the MAC CE activation time has elapsed from reception of the MAC CE.

[0198] [Operation 2]

[0199] The UE uses the SRS resources (parameters) updated by the MAC CE for SRS transmission after the MAC CE activation time has passed since the reception of the MAC CE.

[0200] The MAC CE activation time can also be different for 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 (3msec), and the MAC CE activation time for SP / P-SRS can also be 3 subframe times (3msec) + T. T can be specified in the specification, notified by higher layers, or reported through UE capabilities.

[0201] (Wireless Communication System)

[0202] The following describes a configuration of a wireless communication system according to an embodiment of the present disclosure. In this wireless communication system, communication is performed using any one of the wireless communication methods according to the above-described embodiments of the present disclosure or a combination thereof.

[0203] Figure 14 This figure shows an example of a schematic configuration of a wireless communication system according to one embodiment. The wireless communication system 1 may also be a system that implements communication using Long Term Evolution (LTE) standardized by the Third Generation Partnership Project (3GPP), the fifth generation mobile communication system New Radio (5G NR), or the like.

[0204] In addition, the wireless communication system 1 can also support dual connectivity (Multi-RAT Dual Connectivity (MR-DC)) between multiple radio access technologies (Radio Access Technology (RAT)). MR-DC can 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 (NR-E-UTRA Dual Connectivity (NE-DC)), etc.

[0205] In EN-DC, the LTE (E-UTRA) base station (eNB) is the master node (MN), and the NR base station (gNB) is the secondary node (SN). In NE-DC, the NR base station (gNB) is the MN, and the LTE (E-UTRA) base station (eNB) is the SN.

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

[0207] The wireless communication system 1 may also include a base station 11 that forms a macrocell C1 with relatively wide coverage, and base stations 12 (12a-12c) that are deployed within the macrocell C1 and form small cells C2 that are narrower than the macrocell C1. User terminals 20 may also be located within at least one of the cells. The configuration and number of cells and user terminals 20 are not limited to those shown in the figure. Hereinafter, when not distinguishing between base stations 11 and 12, they are collectively referred to as base stations 10.

[0208] The user terminal 20 may be connected to at least one of the multiple base stations 10. The user terminal 20 may utilize at least one of carrier aggregation (CA) using multiple component carriers (CCs) and dual connectivity (DC).

[0209] Each CC may also be included in at least one of the first frequency band (Frequency Range 1 (FR1)) and the 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 be a frequency band below 6 GHz (below 6 GHz (sub-6 GHz)), and FR2 may be a frequency band higher than 24 GHz (above-24 GHz). In addition, the frequency bands and definitions of FR1 and FR2 are not limited to these. For example, FR1 may also be equivalent to a frequency band higher than FR2.

[0210] Furthermore, in each CC, the user terminal 20 may communicate using at least one of time division duplex (TDD) and frequency division duplex (FDD).

[0211] Multiple base stations 10 can also be connected by wired (for example, optical fiber based on Common Public Radio Interface (CPRI)), X2 interface, etc.) or wireless (for example, NR communication). For example, when NR communication is used as a backhaul between base stations 11 and 12, the base station 11 equivalent to the upper station can also be called an integrated access backhaul (IAB) donor, and the base station 12 equivalent to the relay station (relay) can also be called 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 also include, for example, at least one of an Evolved Packet Core (EPC), a 5G Core Network (5GCN), and a Next Generation Core (NGC).

[0213] The user terminal 20 may also be a terminal that supports at least one of communication methods such as LTE, LTE-A, and 5G.

[0214] In the wireless communication system 1, a radio access scheme based on orthogonal frequency division multiplexing (OFDM) may be used. For example, in at least one of the downlink (DL) and uplink (UL), cyclic prefix OFDM (CP-OFDM), discrete Fourier transform spread OFDM (DFT-s-OFDM), orthogonal frequency division multiple access (OFDMA), or single carrier frequency division multiple access (SC-FDMA) may be used.

[0215] The radio access scheme may also be referred to as a waveform. In addition, in the wireless communication system 1, other radio access schemes (for example, other single-carrier transmission schemes, other multi-carrier transmission schemes) may be used as the UL and DL radio access schemes.

[0216] As downlink channels, the wireless communication system 1 may use a downlink shared channel (Physical Downlink Shared Channel (PDSCH)) shared by each user terminal 20), a broadcast channel (Physical Broadcast Channel (PBCH)), a downlink control channel (Physical Downlink Control Channel (PDCCH)), etc.

[0217] In addition, as uplink channels, the wireless communication system 1 can also use an uplink shared channel (Physical Uplink Shared Channel (PUSCH)) shared by each user terminal 20), an uplink control channel (Physical Uplink Control Channel (PUCCH)), a random access channel (Physical Random Access Channel (PRACH)), etc.

[0218] User data, higher-layer control information, and system information blocks (SIBs) are transmitted via the PDSCH. User data, higher-layer control information, and the like can also be transmitted via the PUSCH. Furthermore, the Master Information Block (MIB) can also be transmitted via the PBCH.

[0219] The lower layer control information may also be transmitted via the PDCCH. The lower layer control information may include, for example, downlink control information (Downlink Control Information (DCI)) including scheduling information for at least one of the PDSCH and the PUSCH.

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

[0221] In PDCCH detection, a control resource set (CORESET) and a search space can also be used. A CORESET corresponds to the resources for searching for DCI. A search space corresponds to the search area and search method for PDCCH candidates. A CORESET can also be associated with one or more search spaces. The UE can also monitor the CORESET associated with a search space based on the search space settings.

[0222] A search space may also correspond to PDCCH candidates corresponding to one or more aggregation levels. One or more search spaces may also be referred to as a search space set. In addition, the terms "search space," "search space set," "search space setting," "search space set setting," "CORESET," and "CORESET setting" in this disclosure may be used interchangeably.

[0223] Uplink control information (uplink control information (UCI)) including at least one of channel state information (CSI), delivery confirmation information (e.g., also known as hybrid automatic repeat request confirmation (HARQ-ACK), ACK / NACK, etc.), and scheduling request (SR) can also be transmitted via the PUCCH. The random access preamble used to establish a connection with a cell can also be transmitted via the PRACH.

[0224] In the present disclosure, downlink, uplink, etc. may be expressed without the word "link." Furthermore, various channels may be expressed without the word "physical" at the beginning.

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

[0226] For example, a synchronization signal may be at least one of a primary synchronization signal (PSS) and a secondary synchronization signal (SSS). A signal block containing SSs (PSS, SSS) and PBCHs (and DMRS for PBCHs) may also be referred to as an SS / PBCH block or an SS block (SSB). Furthermore, SSs and SSBs may also be referred to as reference signals.

[0227] In addition, in the wireless communication system 1, as an uplink reference signal (Uplink Reference Signal (UL-RS)), a measurement reference signal (Sounding Reference Signal (SRS)), a demodulation reference signal (DMRS), etc. can also be transmitted. In addition, DMRS can also be called a user terminal specific reference signal (UE-specific Reference Signal).

[0228] (Base Station)

[0229] Figure 15 This figure shows an example of the configuration of a base station according to one embodiment. The base station 10 includes a control unit 110, a transmitting / receiving unit 120, a transmitting / receiving antenna 130, and a transmission path interface (transmission line interface) 140. Furthermore, more than one of each of the control unit 110, the transmitting / receiving unit 120, the transmitting / receiving antenna 130, and the transmission path interface 140 may be provided.

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

[0231] The control unit 110 controls the entire base station 10. The control unit 110 can be composed of a controller, a control circuit, and the like that are described based on common knowledge in the technical field to which this disclosure relates.

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

[0233] The transceiver 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 transceiver unit 120 may include a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter (phase shifter), a measurement circuit, a transceiver circuit, and the like, which are described based on common knowledge in the technical fields involved in this disclosure.

[0234] The transmitting and receiving unit 120 may be configured as an integrated transmitting and receiving unit or may be configured as a transmitting unit and a receiving unit. The transmitting unit may also be configured as a transmitting processing unit 1211 and an RF unit 122. The receiving unit may also be configured as a receiving processing unit 1212, an RF unit 122, and a measuring unit 123.

[0235] The transmitting and receiving antenna 130 can be formed of an antenna described based on common knowledge in the technical field to which this disclosure relates, such as an array antenna.

[0236] The transmitting and receiving unit 120 may also transmit the aforementioned downlink channel, synchronization signal, downlink reference signal, etc. The transmitting and receiving unit 120 may also receive the aforementioned uplink channel, uplink reference signal, etc.

[0237] The transmitting and receiving unit 120 may also use digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), etc. to form at least one of a transmit beam and a receive beam.

[0238] The sending and receiving unit 120 (sending processing unit 1211) can also perform processing on the Packet Data Convergence Protocol (PDCP) layer, the Radio Link Control (RLC) layer (for example, RLC retransmission control), the Medium Access Control (MAC) layer (for example, HARQ retransmission control), etc. on the data and control information obtained from the control unit 110 to generate a bit string to be sent.

[0239] The transmitting and receiving unit 120 (transmitting processing unit 1211) can also perform channel coding (which may also include error correction coding), modulation, mapping, filter processing (filtering processing), discrete Fourier transform (DFT) processing (as needed), inverse fast Fourier transform (IFFT) processing), precoding, digital-to-analog conversion and other transmission processing on the bit string to be sent, and output a baseband signal.

[0240] The transmitting and receiving unit 120 (RF unit 122 ) may also perform modulation, filter processing, amplification, etc. on the baseband signal to a radio frequency band, and transmit the signal in the radio frequency band via the transmitting and receiving antenna 130 .

[0241] On the other hand, the transmitting and receiving unit 120 (RF unit 122 ) may also perform amplification, filter processing, and demodulation into a baseband signal on the radio frequency band signal received by the transmitting and receiving antenna 130 .

[0242] The transmitting and receiving unit 120 (receiving processing unit 1212) can also apply receiving processing such as analog-to-digital conversion, fast Fourier transform (FFT) processing, inverse discrete Fourier transform (IDFT) processing (as needed), filter processing, demapping, demodulation, decoding (which may also include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the obtained baseband signal to obtain user data, etc.

[0243] The transmitting and receiving unit 120 (measuring unit 123) may also perform measurements related to the received signal. For example, the measuring unit 123 may also perform radio resource management (RRM) measurements, channel state information (CSI) measurements, etc. based on the received signal. The measuring unit 123 may also measure 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 can also send and receive signals (return signaling) between the devices included in the core network 30, other base stations 10, etc., and can also obtain and transmit user data (user plane data) and control plane data for the user terminal 20.

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

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

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

[0248] (User Terminal)

[0249] Figure 16 This figure shows an example of the configuration of a user terminal according to one embodiment. The user terminal 20 includes a control unit 210, a transmitting / receiving unit 220, and a transmitting / receiving antenna 230. Furthermore, more than one of each of the control unit 210, the transmitting / receiving unit 220, and the transmitting / receiving antenna 230 may be provided.

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

[0251] The control unit 210 controls the entire user terminal 20. The control unit 210 can be composed of a controller, a control circuit, and the like that are described based on common knowledge in the technical field to which this disclosure relates.

[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 and reception unit 220 and the transmission and 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 and reception unit 220.

[0253] The transceiver 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 transceiver unit 220 may include a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transceiver circuit, and the like, which are described based on common knowledge in the technical fields involved in this disclosure.

[0254] The transmitting and receiving unit 220 may be configured as an integrated transmitting and receiving unit or may be composed of a transmitting unit and a receiving unit. The transmitting unit may also be composed of a transmitting processing unit 2211 and an RF unit 222. The receiving unit may also be composed of a receiving processing unit 2212, an RF unit 222, and a measuring unit 223.

[0255] The transmitting and receiving antenna 230 can be formed of an antenna described based on common knowledge in the technical field involved in the present disclosure, such as an array antenna.

[0256] The transmitting and receiving unit 220 may also receive the aforementioned downlink channel, synchronization signal, downlink reference signal, etc. The transmitting and receiving unit 220 may also transmit the aforementioned uplink channel, uplink reference signal, etc.

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

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

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

[0260] In addition, whether or not to apply DFT processing may also be based on the transform precoding setting. For a certain channel (e.g., PUSCH), if transform precoding is valid (enabled), the transmitting / receiving unit 220 (transmitting processing unit 2211) may perform DFT processing as the aforementioned transmission processing in order to transmit the channel using a DFT-s-OFDM waveform. Otherwise, the transmitting / receiving unit 220 (transmitting processing unit 2211) may perform DFT processing as the aforementioned transmission processing without performing DFT processing.

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

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

[0263] The transmitting and receiving unit 220 (receiving processing unit 2212) can also apply receiving processing such as analog-to-digital conversion, FFT processing, IDFT processing (as needed), filter processing, demapping, demodulation, decoding (which may also include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the obtained baseband signal to obtain user data, etc.

[0264] The transmitting and receiving unit 220 (measuring unit 223) may also perform measurements related to received signals. For example, the measuring unit 223 may also perform RRM measurements, CSI measurements, etc. based on the received signals. The measuring unit 223 may also measure received power (e.g., RSRP), received 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 transmitting unit and the receiving unit of the user terminal 20 in the present disclosure may also be composed of at least one of the transmitting and receiving unit 220 and the transmitting and receiving antenna 230 .

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

[0267] The transmitting and receiving unit 220 may also receive a radio resource control information element indicating multiple SRS resource sets. The MAC CE may also activate more than one SRS resource set among the multiple SRS resource sets.

[0268] The transmitting and receiving unit 220 may also receive a radio resource control information element indicating the parameter. The MACCE may also update the parameter.

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

[0270] The transmitting / receiving unit 220 may also receive a medium access control-control element (MAC CE) indicating a mapping between one or more values of a parameter for a sounding reference signal (SRS) resource set or an 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 a non-periodic SRS resource trigger and an SRS resource set.

[0272] The MAC CE may also indicate multiple SRS resource sets. Multiple values of the field may also be mapped to the multiple SRS resource sets.

[0273] The downlink control information may 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 show blocks of functional units. These functional blocks (structural units) are implemented by any combination of at least one of hardware and software. In addition, the implementation method of each functional block is not particularly limited. That is, each functional block can be implemented by a device that is physically or logically combined, or two or more physically or logically separated devices can be directly or indirectly connected (for example, by wired, wireless, etc.) and implemented by these multiple devices. The functional block can also be implemented by combining the above-mentioned one device or the above-mentioned multiple devices with software.

[0276] Here, the functions include judging, deciding, determining, calculating, calculating, processing, deriving, investigating, searching, confirming, receiving, sending, outputting, accessing, resolving, selecting, selecting, establishing, comparing, assuming, expecting, regarding, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, etc., but are not limited to these. For example, a functional block (structural unit) that implements a sending function may also be referred to as a transmitting unit, a transmitter, etc. Any of them are as described above, and the implementation method is not particularly limited.

[0277] For example, a base station, a user terminal, etc. in one embodiment of the present disclosure may also function as a computer that performs processing of the wireless communication method of the present disclosure. Figure 17 This figure shows an example of the hardware configuration of a base station and a user terminal according to one embodiment. The base station 10 and user terminal 20 described above 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, and the like.

[0278] In addition, in this disclosure, the terms such as device, circuit, equipment, section, and unit are interchangeable. The hardware structure of the base station 10 and the user terminal 20 may include one or more of the devices shown in the figure, or may exclude some of the devices.

[0279] For example, although only one processor 1001 is shown, multiple processors may be provided. Furthermore, processing may be performed by a single processor, or by two or more processors simultaneously, sequentially, or using other methods. Furthermore, processor 1001 may be implemented using more than one chip.

[0280] Regarding the various functions in the base station 10 and the user terminal 20, for example, they are achieved by reading specific software (program) into hardware such as the processor 1001 and the memory 1002, so that the processor 1001 performs calculations and controls communication via the communication device 1004, or controls at least one of the reading and writing of data in the memory 1002 and the storage 1003.

[0281] The processor 1001 controls the entire computer by, for example, operating an operating system. The processor 1001 may also be composed of a central processing unit (CPU) including an interface with peripheral devices, a control device, a computing device, registers, etc. For example, at least a portion of the control unit 110 (210) and the transmitting and receiving unit 120 (220) described above may also be implemented by the processor 1001.

[0282] In addition, the processor 1001 reads a program (program code), a 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 a program, a program that causes a computer to perform at least a portion of the operations described in the above embodiments can be used. For example, the control unit 110 (210) can also be implemented by a control program stored in the memory 1002 and operated by the processor 1001, and the other functional blocks can also be implemented similarly.

[0283] The memory 1002 may also be a computer-readable recording medium, for example, comprised of at least one of a read-only memory (ROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), a random access memory (RAM), or other suitable storage medium. The memory 1002 may also be referred to as a register, a cache, a main memory (main storage device), etc. The memory 1002 may store executable programs (program code), software modules, etc., 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, such as a flexible disk, a floppy disk, an optical disk (such as a compact disk (Compact Disc ROM (CD-ROM)), etc.), a digital versatile disk, a Blu-ray disk), a removable disk, a hard disk drive, a smart card, a flash memory device (such as a card, a stick, or a key drive), a magnetic stripe, a database, a server, or other suitable 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 communicating between computers via at least one of a wired network and a wireless network, and is also referred to as a network device, a network controller, a network card, a communication module, or the like. To implement at least one of frequency division duplex (FDD) and time division duplex (TDD), the communication device 1004 may also include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, and the like. For example, the aforementioned transmitting and receiving unit 120 (220), transmitting and receiving antenna 130 (230), and the like may also be implemented by the communication device 1004. The transmitting and receiving unit 120 (220) may also be implemented by physically or logically separating the transmitting unit 120a (220a) and the receiving unit 120b (220b).

[0286] The input device 1005 is an input device that receives input from the outside (e.g., a keyboard, mouse, microphone, switch, button, sensor, etc.). The output device 1006 is an output device that outputs to the outside (e.g., a display, speaker, light emitting diode (LED) lamp, etc.). Alternatively, the input device 1005 and the output device 1006 may be integrated (e.g., a touch panel).

[0287] Furthermore, the processor 1001, memory 1002, and other devices are connected via a bus 1007 for communicating information. The bus 1007 may be configured as a single bus or may be configured as different buses between the devices.

[0288] Furthermore, 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), or a field programmable gate array (FPGA), and may use such hardware to implement part or all of each functional block. For example, the processor 1001 may also be implemented using at least one of these hardware components.

[0289] (Variation)

[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, channel, symbol, and signal (signal or signaling) may be replaced with each other. In addition, a signal may also be a message. A reference signal may also be referred to as RS, or may be referred to as a pilot, pilot signal, etc. depending on the applied standard. In addition, a component carrier (CC) may also be referred to as a cell, frequency carrier, carrier frequency, etc.

[0291] A radio frame can also be composed of one or more periods (frames) in the time domain. Each period (frame) of the one or more periods (frames) that constitute a radio frame can also be called a subframe. Furthermore, a subframe can also be composed of one or more time slots in the time domain. A subframe can also be a fixed time length (e.g., 1 ms) that is independent of the parameter set (numerology).

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

[0293] A time slot may also be composed of one or more symbols (Orthogonal Frequency Division Multiplexing (OFDM) symbols, 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 a parameter set.

[0294] A time slot may also contain multiple mini-slots. Each mini-slot may also consist of one or more symbols in the time domain. Furthermore, a mini-slot may also be referred to as a sub-slot. A mini-slot may also consist of fewer 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 mini-slots may also be referred to as PDSCH (PUSCH) mapping type B.

[0295] Radio frames, subframes, time slots, mini-time slots, and symbols all represent time units used for signal transmission. Radio frames, subframes, time slots, mini-time slots, and symbols may also be referred to by their respective equivalents. Furthermore, the terms frame, subframe, time slot, mini-time slot, and symbol may be used interchangeably in this disclosure.

[0296] For example, a subframe can be called a TTI, multiple consecutive subframes can be called a TTI, and a slot or a mini-slot can be called a TTI. That is, at least one of a subframe and a TTI can be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (e.g., 1-13 symbols), or a period longer than 1 ms. Furthermore, the unit representing a TTI can be called a slot, a mini-slot, or the like, rather than a subframe.

[0297] Here, TTI refers to, for example, the minimum time unit for scheduling in wireless communications. For example, in the LTE system, a base station schedules each user terminal by allocating radio resources (such as the frequency bandwidth and transmit power available to each user terminal) in TTI units. The definition of TTI is not limited to this.

[0298] The TTI may also be a unit of time for transmitting channel-coded data packets (transport blocks), code blocks, code words, etc., and may also be a unit of processing for scheduling, link adaptation, etc. Furthermore, when a TTI is given, the time interval (e.g., the number of symbols) to which the transport blocks, code blocks, code words, etc. are actually mapped may be shorter than the TTI.

[0299] In addition, when a time slot or a mini-time slot is called a TTI, one or more TTIs (i.e., one or more time slots or one or more mini-time slots) can also be the minimum time unit for scheduling. In addition, the number of time slots (mini-time slots) that constitute the minimum time unit for 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 (partial or fractional TTI), a shortened subframe, a short subframe, a mini-slot, a subslot, a time slot, etc.

[0301] In addition, long TTI (for example, normal TTI, subframe, etc.) can also be replaced by TTI with a time length exceeding 1ms, and short TTI (for example, shortened TTI, etc.) can also be replaced by TTI with a TTI length smaller than long TTI and greater than 1ms.

[0302] A resource block (RB) is a unit of resource allocation in the time and frequency domains. In the frequency domain, it may also include one or more consecutive subcarriers (subcarriers). The number of subcarriers included in an RB may be the same regardless of the parameter set, for example, it may 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 slot, a mini-slot, a subframe, or a TTI. A TTI, a subframe, etc. may also be composed of one or more resource blocks.

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

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

[0306] A Bandwidth Part (BWP) (also referred to as a fractional bandwidth) can also represent a subset of contiguous common resource blocks (RBs) used for a particular parameter set within a particular carrier. Common RBs can also be identified by their index relative to the common reference point of the carrier. PRBs can also be defined within a BWP and numbered within that BWP.

[0307] The BWP may include a UL BWP (BWP for UL) and a DL BWP (BWP for DL). For a UE, one or more BWPs may be configured within one carrier.

[0308] At least one of the configured BWPs may be activated, and the UE may not assume that it will transmit or receive specific channels / signals outside of the activated BWP.

[0309] The above-mentioned structures of radio frames, subframes, slots, mini-slots, and symbols are merely examples. For example, various modifications may be made to the number of subframes in a radio frame, the number of slots per subframe or radio frame, the number of mini-slots within a slot, the number of symbols and RBs within a slot or mini-slot, the number of subcarriers within an RB, the number of symbols within a TTI, the symbol length, and the cyclic prefix (CP) length.

[0310] Furthermore, the information and parameters described in this disclosure may be expressed as absolute values, relative values relative to a specific value, or other corresponding information. For example, wireless resources may be indicated by specific indexes.

[0311] The names used for parameters, etc. in this disclosure are not intended to be limiting in any respect. Furthermore, the mathematical formulas for these parameters may differ from those explicitly disclosed in this disclosure. Various channels (PUCCH, PDCCH, etc.) and information elements can be identified by any suitable names, and therefore, the various names assigned to these various channels and information elements are not intended to be limiting in any respect.

[0312] Information, signals, and the like described in this disclosure may also be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, and the like that may be referred to throughout the foregoing description may also be represented by voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any combination thereof.

[0313] Furthermore, information, signals, etc. can be output in at least one of the following directions: from a higher layer (upper layer) to a lower layer (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] Input and output information, signals, etc. may be stored in a specific location (e.g., memory) or managed using a management table. Input and output information, signals, etc. may be overwritten, updated, or appended. Output information, signals, etc. may also be deleted. Input information, signals, etc. may also be sent to other devices.

[0315] The notification of information is not limited to the methods / implementations described in the present disclosure, and may also be performed by other methods. For example, the notification of information in the present disclosure may also be implemented through physical layer signaling (e.g., downlink control information (Downlink Control Information (DCI))), uplink control information (Uplink Control Information (UCI))), high-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 may also be referred to as Layer 1 / Layer 2 (L1 / L2) control information (L1 / L2 control signal), L1 control information (L1 control signal), etc. In addition, RRC signaling may also be referred to as an RRC message, and may be, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, etc. In addition, MAC signaling may also be notified using, for example, a MAC Control Element (CE).

[0317] Furthermore, notification of specific information (eg, notification of “it is X”) is not limited to explicit notification, but may be performed implicitly (eg, by not notifying the specific information or by notifying other information).

[0318] The determination can be made by a value represented by a bit (0 or 1), a true or false value (Boolean value) represented by true (true) or false (false), or by comparison of numerical values (for example, comparison with a specific value).

[0319] The term “software” or “firmware” shall be construed broadly 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, or the like.

[0320] Furthermore, software, instructions, information, and the like may also be transmitted and received via a transmission medium. For example, if the software is transmitted from a website, server, or other remote source using at least one of a wired technology (coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), etc.) and a wireless technology (infrared, microwave, etc.), at least one of these wired and wireless technologies is included within the definition of a transmission medium.

[0321] The terms "system" and "network" used in this disclosure can be used interchangeably. "Network" may also refer to devices included in the network (eg, base stations).

[0322] In the present disclosure, terms such as "precoding", "precoder", "weight (precoding weight)", "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", and "panel" can be used interchangeably.

[0323] In this disclosure, terms such as "base station (BS)", "wireless 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" are used interchangeably. In some cases, a base station may be referred to as a macro cell, small cell, femto cell, or pico cell.

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

[0325] In the present disclosure, terms such as “mobile station (MS)”, “user terminal”, “user device (UE)”, and “terminal” can be used interchangeably.

[0326] A mobile station may also be referred to as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, hand set, user agent, mobile client, client, or several other appropriate 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. Furthermore, at least one of the base station and the mobile station may also be a device mounted on a mobile object, a mobile object itself, etc. The mobile object may be a means of transportation (e.g., a vehicle, an aircraft, etc.), a mobile object that moves unmanned (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). Furthermore, at least one of the base station and the mobile station also includes a device that does not necessarily move when performing 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] In addition, the base station in the present disclosure may also be replaced by a user terminal. For example, the various methods / implementations of the present disclosure may also be applied to a structure in which the communication between a base station and a user terminal is replaced by communication between multiple user terminals (for example, which may also be referred to as device-to-device (D2D)), vehicle-to-everything (V2X), etc.). In this case, it may also be configured such that the user terminal 20 has the functions of the above-mentioned base station 10. In addition, terms such as "uplink" and "downlink" may also be replaced by terms corresponding to inter-terminal communication (for example, "side"). For example, uplink channels, downlink channels, etc. may also be replaced by side channels.

[0329] Likewise, the user terminal in the present disclosure may be replaced by a base station. In this case, the base station 10 may have the functions of the user terminal 20 described above.

[0330] In the present disclosure, actions are assumed to be performed by a base station, and sometimes, depending on the circumstances, by its upper node. Obviously, in a network including one or more network nodes having a base station, various operations performed for communication with a terminal may be performed by the base station, one or more network nodes other than the base station (for example, a Mobility Management Entity (MME)), a Serving-Gateway (S-GW), etc., but not limited to these), or a combination thereof.

[0331] The various methods / implementations described in this disclosure may be used individually or in combination, and may be switched between them during execution. Furthermore, the processing procedures, sequences, flow charts, and the like of the various methods / implementations described in this disclosure may be reversed as long as they do not conflict. For example, the methods described in this disclosure use an illustrative order to present elements of various steps, but are not limited to the specific order presented.

[0332] The various modes and embodiments described in the present disclosure may 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) (xG (x is, for example, an integer or a decimal)), 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 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, and next-generation systems based on these. In addition, multiple systems can also be combined for application (for example, LTE or LTE-A, combination with 5G, etc.).

[0333] The phrase “based on” used in this 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 designations "first," "second," etc., as used in this disclosure, does not necessarily define the quantity or order of these elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Therefore, reference to a first and a second element does not imply that only two elements may be used or that the first element must in some way take precedence over the second element.

[0335] The term "determining" as used in this disclosure may encompass a variety of actions. For example, "determining" may also include judging, calculating, computing, processing, deriving, investigating, looking up (e.g., searching in a table, database, or other data structure), ascertaining, etc. as performing a "determination."

[0336] In addition, "judgment (decision)" can also be a situation where receiving (for example, receiving information), transmitting (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] Furthermore, "judgment (decision)" can also refer to situations where resolving, selecting, choosing, establishing, comparing, etc. can be considered as "judgment (decision)". In other words, "judgment (decision)" can also refer to situations where certain actions can be considered as "judgment (decision)".

[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," "coupled," or any variation thereof, refer to any direct or indirect connection or coupling between two or more elements, and may include the presence of one or more intermediate elements between the two elements being "connected" or "coupled." The coupling or connection between elements may be physical, logical, or a combination thereof. For example, "connected" may be replaced by "access."

[0340] In the present disclosure, when two elements are connected, it is possible to consider them being "connected" or "combined" to each other using one or more wires, cables, printed electrical connections, etc., as well as using electromagnetic energy with wavelengths in the wireless frequency domain, microwave region, light (both visible and invisible) region, etc. as several non-limiting and non-inclusive examples.

[0341] In the present disclosure, the term "A is different from B" may also mean "A and B are different from each other." Alternatively, the term may also mean "A and B are each different from C." Terms such as "separate" and "bound" may also be interpreted in the same manner as "different."

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

[0343] In the present disclosure, when an article is added by translation, such as a, an, and the in English, the present disclosure may also include a case where the noun following the article is in a plural form.

[0344] While the inventions disclosed herein have been described in detail above, it will be apparent to those skilled in the art that the inventions disclosed herein are not limited to the embodiments described herein. The inventions disclosed herein can be implemented in modified and altered forms without departing from the spirit and scope of the invention as defined by the claims. Therefore, the descriptions in this disclosure are for illustrative purposes only and are not intended to limit the inventions disclosed herein in any way.

Claims

1. A terminal comprising: a control unit that controls transmission of a report of capability information indicating capability of antenna switching for more than four receiving antennas; and a receiving unit, receiving one or more sounding reference signal resource sets (SRS resource sets) having the purpose of the antenna switching and depending on the setting of the capability information, and receiving a medium access control element (MAC CE) for activating one of the one or more SRS resource sets, The control unit controls SRS transmission using the one SRS resource set based on the setting and the MAC CE, The capability information indicates the maximum number of the one or more SRS resource sets, The maximum number is greater than the maximum number of SRS resource sets set in other terminals that do not have the capability.

2. The terminal according to claim 1, wherein: The capability information represents at least one of the capability of antenna switching for one transmitting antenna and six receiving antennas, the capability of antenna switching for two transmitting antennas and six receiving antennas, the capability of antenna switching for four transmitting antennas and six receiving antennas, the capability of antenna switching for one transmitting antenna and eight receiving antennas, the capability of antenna switching for two transmitting antennas and eight receiving antennas, and the capability of antenna switching for four transmitting antennas and eight receiving antennas.

3. A wireless communication method for a terminal, comprising: controlling the sending of a report of capability information indicating a capability of antenna switching for more than four receive antennas; receiving a step of indicating one or more sounding reference signal resource sets (SRS resource sets) used for the antenna switching and depending on the setting of the capability information; and receiving a medium access control element (MAC CE) for activating one of the one or more SRS resource sets; and a step of controlling SRS transmission using the one SRS resource set based on the setting and the MAC CE, The capability information indicates the maximum number of the one or more SRS resource sets, The maximum number is greater than the maximum number of SRS resource sets set in other terminals that do not have the capability.

4. A base station comprising: a control unit that controls reception of a report of capability information indicating capability of antenna switching for more than four receiving antennas; and a sending unit, sending one or more sounding reference signal resource sets (SRS resource sets) having the purpose of the antenna switching and depending on the setting of the capability information, and sending a medium access control element (MAC CE) for activating one of the one or more SRS resource sets, The control unit controls SRS reception using the one SRS resource set based on the setting and the MAC CE, The capability information indicates the maximum number of the one or more SRS resource sets, The maximum number is greater than the maximum number of SRS resource sets set in other terminals that do not have the capability.

5. A system having a terminal and a base station, The terminal has: a control unit that controls transmission of a report of capability information indicating capability of antenna switching for more than four receiving antennas; and a receiving unit, receiving one or more sounding reference signal resource sets (SRS resource sets) having the purpose of the antenna switching and depending on the setting of the capability information, and receiving a medium access control element (MAC CE) for activating one of the one or more SRS resource sets, The control unit controls SRS transmission using the one SRS resource set based on the setting and the MAC CE, The base station sends the setting and the MAC CE, The capability information indicates the maximum number of the one or more SRS resource sets, The maximum number is greater than the maximum number of SRS resource sets set in other terminals that do not have the capability.

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