Terminal, wireless communication method, base station and system

Abstract

A terminal according to one embodiment of the present disclosure has a reception unit for receiving a medium access control-control element (MAC CE) that relates to a parameter for a sounding reference signal (SRS) resource set or an SRS resource, and a control unit for controlling SRS transmission on the basis of the parameter. 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 and a wireless communication method in a next-generation mobile communication system. 、 base station and systems Regarding. [Background technology]

[0002] In the Universal Mobile Telecommunications System (UMTS) network, Long Term Evolution (LTE) has been specified for the purpose of achieving higher data rates and lower latency (Non-Patent Document 1). In addition, LTE-Advanced (3GPP Rel. 10-14) has been specified for the purpose of achieving higher capacity and greater sophistication of LTE (Third Generation Partnership Project (3GPP) Release (Rel.) 8, 9).

[0003] Successor systems to LTE (e.g., 5th generation mobile communication system (5G), 5G+ (plus), 6th generation mobile communication system (6G), New Radio (NR), 3GPP Rel. 15 or later, etc.) are also being considered. [Prior art documents] [Non-patent literature]

[0004] [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 [Problem to be solved by the invention]

[0005] In NR, the use of the Sounding Reference Signal (SRS) is diverse. The NR SRS is used not only for uplink (UL) CSI measurement, but also for downlink (DL) CSI measurement and beam management.

[0006] However, little progress has been made in flexibly controlling SRS parameters. If SRS parameters are not flexibly set, there is a risk that resource utilization efficiency, communication throughput, communication quality, etc. will deteriorate.

[0007] Therefore, the present disclosure relates to a terminal and a wireless communication method for flexibly controlling SRS parameters. 、 base station and systems One of the aims is to provide. [Means for solving the problem]

[0008] A terminal according to one embodiment of the present disclosure includes: a control unit that controls transmission of a report of capability information indicating a capability of antenna switching for more than four receiving antennas; and a receiving unit that receives a configuration indicating one or more sounding reference signal (SRS) resource sets having a use for the antenna switching and dependent on the capability information, and receives a medium access control-control element (MAC CE) that activates one SRS resource set of the one or more SRS resource sets, and the control unit controls SRS transmission using the one SRS resource set based on the configuration and the MAC CE. The capability information indicates a maximum number of the one or more SRS resource sets, and the maximum number is greater than a maximum number of SRS resource sets set in another terminal that does not have the capability. . Effect of the Invention

[0009] According to one embodiment of the present disclosure, SRS parameters can be flexibly controlled. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is a diagram showing an example of an association between the value of a 2-bit SRS request field and an SRS resource set. [Diagram 2] FIG. 2 is a diagram showing an example of an association between a value of a 1-bit SRS request field and an SRS resource set. [Diagram 3] FIG. 3 is a diagram illustrating an example of the MAC CE1 according to the first embodiment. [Figure 4] 4A and 4B are diagrams illustrating an example of a variation of MAC CE1 in the first embodiment. [Diagram 5] 5A and 5B are diagrams illustrating an example of the MAC CE2 of the first embodiment. [Figure 6] 6A and 6B are diagrams illustrating an example of a MAC CE for activation / deactivation of an SRS resource set in the third embodiment. [Figure 7] 7A and 7B are diagrams illustrating an example of a MAC CE for mapping between a value of an SRS request field and a specific parameter in the third embodiment. [Figure 8] 8A and 8B are diagrams illustrating an example of variation 1 of a MAC CE for mapping between a value of an SRS request field and a specific parameter in the third embodiment. [Figure 9] 9A and 9B are diagrams illustrating an example of variation 2 of a MAC CE for mapping between a value of an SRS request field and a specific parameter in the third embodiment. [Figure 10] FIG. 10 is a diagram illustrating an example of a MAC CE indicating an A-SRS resource trigger according to the third embodiment. [Figure 11] FIG. 11 is a diagram showing an example of option 1 in variation 3 of the fourth embodiment. [Figure 12] FIG. 12 is a diagram showing an example of option 2 in variation 3 of the fourth embodiment. [Figure 13] FIG. 13 is a diagram showing an example of option 3 of variation 3 of the fourth embodiment. [Figure 14] FIG. 14 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment. [Figure 15] FIG. 15 is a diagram illustrating an example of the configuration of a base station according to an embodiment. [Figure 16] FIG. 16 is a diagram illustrating an example of the configuration of a user terminal according to an embodiment. [Figure 17] FIG. 17 is a diagram illustrating an example of the hardware configuration of a base station and a user terminal according to an embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] (SRS) In NR, the sounding reference signal (SRS) has a wide range of uses. NR's SRS is used not only for uplink (UL) CSI measurement, which was also used in existing LTE (LTE Rel. 8-14), but also for downlink (DL) CSI measurement, beam management, etc.

[0012] A UE may be configured with one or more SRS resources, which may be identified by an SRS Resource Index (SRI).

[0013] Each SRS resource may have one or more SRS ports (corresponding to one or more SRS ports). For example, the number of ports per SRS may be 1, 2, 4, etc.

[0014] The UE may be configured with one or more SRS resource sets. One SRS resource set may be associated with a predetermined number of SRS resources. The UE may use higher layer parameters in common for the SRS resources included in one SRS resource set. Note that the resource set in the present disclosure may be interpreted as a set, a resource group, a group, or the like.

[0015] Information regarding the SRS resource or resource set may be configured in the UE using higher layer signaling, physical layer signaling, or a combination thereof.

[0016] 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, and the like, or a combination of these.

[0017] The MAC signaling may be, for example, a MAC Control Element (MAC CE), a MAC Protocol Data Unit (PDU), etc. The broadcast information may be, for example, a Master Information Block (MIB), a System Information Block (SIB), Remaining Minimum System Information (RMSI), Other System Information (OSI), etc.

[0018] The physical layer signaling may be, for example, Downlink Control Information (DCI).

[0019] The SRS configuration information (eg, the RRC information element "SRS-Config") may include SRS resource set configuration information, SRS resource configuration information, and the like.

[0020] The SRS resource set configuration information (e.g., the RRC parameter "SRS-ResourceSet") may include an SRS resource set ID (Identifier) ​​(SRS-ResourceSetId), a list of SRS resource IDs (SRS-ResourceId) used in the resource set, an SRS resource type (resourceType), and information on SRS usage (usage).

[0021] Here, the SRS resource type may indicate the time domain behavior of the SRS resource configuration, and may indicate any one of Periodic SRS (P-SRS), Semi-Persistent SRS (SP-SRS), and Aperiodic SRS (A-SRS). Note that the UE may transmit the P-SRS and SP-SRS periodically (or periodically after activation). The UE may transmit the A-SRS based on an SRS request of the DCI.

[0022] Furthermore, the use of the SRS (RRC parameter "usage" and L1 (Layer-1) parameter "SRS-SetUse") may be, for example, beam management, codebook (CB), non-codebook (NCB), antenna switching, etc. For example, an SRS for codebook or non-codebook use may be used to determine a precoder for codebook-based or non-codebook-based uplink shared channel (Physical Uplink Shared Channel (PUSCH)) transmission based on the SRI.

[0023] The SRS for beam management may assume that only one SRS resource for each SRS resource set may be transmitted at a given time instant, and multiple SRS resources with the same time domain behavior in the same Bandwidth Part (BWP) may be transmitted simultaneously if they belong to different SRS resource sets.

[0024] The SRS resource configuration information (e.g., the RRC parameter "SRS-Resource") may include an SRS resource ID (SRS-ResourceId), an SRS port number, an SRS port number, a transmission Comb, an SRS resource mapping (e.g., time and / or frequency resource position, resource offset, resource period, number of repetitions, number of SRS symbols, SRS bandwidth, etc.), hopping related information, an SRS resource type, a sequence ID, spatial relationship information, etc.

[0025] The UE may switch the Bandwidth Part (BWP) for transmitting the SRS for each slot, or may switch the antenna, and may apply at least one of intra-slot hopping and inter-slot hopping to the SRS transmission.

[0026] (A-SRS triggering) The SRS request field that triggers the A-SRS is included, for example, in DCI formats 0_1, 0_2, 1_1, 1_2, and 2_3.

[0027] As shown in the example of FIG. 1, among the values ​​(code points) of the 2-bit SRS request field, the three values ​​01, 10, and 11 other than the value 00 are associated (mapped) to one or more SRS resource sets.

[0028] The size of the SRS request field in DCI formats 0_2 and 1_2 may be 0, 1, 2, or 3 bits. As in the example of Fig. 2, among the values ​​(code points) of the 1-bit SRS request field, the value 1 is associated (mapped) to one or more SRS resource sets.

[0029] The time between the triggering of A-SRS and the SRS transmission is a value k (slot offset) that is set by RRC.

[0030] The SRS resource set information element (SRS-ResourceSet) includes a slot offset (slotoffset) and an A-SRS resource trigger list (aperiodicSRS-ResourceTriggerList) for the A-SRS. That is, the slot offset and the A-SRS resource trigger list are configured for each SRS resource set. If a slot offset is not configured, the UE applies no offset (value 0). The A-SRS resource trigger list includes one or more A-SRS resource trigger (aperiodicSRS-ResourceTrigger) information elements (state, ID). The A-SRS resource trigger indicates a DCI code point for transmitting the SRS according to the SRS resource set configuration in which it is included.

[0031] It is preferable to improve the flexibility of SRS parameters, for example, A-SRS triggering, so that many UEs can transmit SRS in the same UL slot and triggering grants (DCI, PDCCH including SRS request field) to these UEs are transmitted in multiple DL slots to distribute the PDCCH load.

[0032] Unless the flexibility of SRS parameters is improved, there is a risk that resource utilization efficiency, communication throughput, communication quality, etc. will deteriorate.

[0033] Therefore, the present inventors came up with the idea of ​​a method for flexibly controlling the SRS parameters.

[0034] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. Wireless communication methods according to the embodiments may be applied independently or in combination.

[0035] In the present disclosure, "A / B" and "at least one of A and B" may be read as interchangeable. In the present disclosure, cell, serving cell, CC, carrier, BWP, DL BWP, UL BWP, active DL BWP, active UL BWP, and band may be read as interchangeable. In the present disclosure, index, ID, indicator, and resource ID may be read as interchangeable. In the present disclosure, RRC, RRC parameter, RRC message, higher layer parameter, information element (IE), and configuration may be read as interchangeable. In the present disclosure, support, control, controllable, operate, and operate may be read as interchangeable. In the present disclosure, sequence, list, set, and group may be read as interchangeable. In the present disclosure, mapping, association, relationship, and table may be read as interchangeable.

[0036] In the present disclosure, the terms activate, update, indicate, enable, and specify may be read as interchangeable.

[0037] In the present disclosure, the terms MAC CE, update command, and activation / deactivation command may be interchangeable.

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

[0039] The MAC signaling may be, for example, a MAC Control Element (MAC CE), a MAC Protocol Data Unit (PDU), etc. The broadcast information may be, for example, a Master Information Block (MIB), a System Information Block (SIB), Remaining Minimum System Information (RMSI), Other System Information (OSI), etc.

[0040] In the following embodiments, an SRS resource set / SRS resource may be interchangeably read as an SRS resource set / SRS resource for a specific purpose (e.g., codebook, non-codebook, beam management), an SRS resource set / SRS resource for the same purpose, etc.

[0041] (Wireless communication method) <First embodiment> An SRS resource set or a specific parameter set for (each) an SRS resource set may be controlled by the MAC CE. The specific parameter may be a parameter set for each SRS resource set by the RRC, or may be a parameter set for each SRS resource by the RRC.

[0042] One value of a specific parameter may be notified by the RRC and MAC CE. DCI may not be used to notify the specific parameter.

[0043] The specific parameter may be a parameter of a resource in the time domain / frequency domain of the SRS (eg, a slot offset).

[0044] The value of a particular parameter may follow any of the following notification methods 1 to 3.

[0045] [Notification method 1] The value of a specific parameter may be set by the RRC and overwritten by the MAC CE. The RRC parameters for setting the specific parameter may be the same as the RRC parameters of Rel.15 / 16. A new MAC CE may be introduced to update the value of the specific parameter.

[0046] [Notification method 2] A list of multiple values ​​(candidates) of a specific parameter may be configured by the RRC, and a value (index) in the list may be specified by the MAC CE. The RRC parameters for configuring the specific parameter may be different from the RRC parameters of Rel.15 / 16. A new MAC CE may be introduced to specify the value of the specific parameter.

[0047] [Notification method 3] The value of the specific parameter may not be set by RRC. The value of the specific parameter may be specified (directly) by MAC CE. The RRC parameter for setting the specific parameter may be an optional field in Rel.15 / 16. A new MAC CE may be introduced for specifying the value of the specific parameter. If the RRC parameter for setting the specific parameter is not set, the value of the specific parameter may be 0 (may be considered as 0 (no offset)).

[0048] The new MAC CE may be any of the following MAC CE1 and CE2.

[0049] MAC CE1 The new MAC CE may update / indicate / inform certain parameters in the SRS resource set.

[0050] The new MAC CE may follow notification method 1 or 3 above.

[0051] In the example of FIG. 3, the new MAC CE may include at least one of a reserved (R) field, a serving cell ID field, a BWP ID field, an SRS resource set ID field, and a slot offset field. If the value of the slot offset is from 0 to 32, the size of the slot offset field may be 6 bits. In Rel. 15, if the slot offset is not configured, the value of the slot offset is 0. In this example, if the slot offset is not configured, the value of the slot offset may be the value signaled by the MAC CE.

[0052] The new MAC CE may follow at least one of the following variations 1 and 2.

[0053] [Variation 1] The size of the slot offset field may be smaller than 6 bits. As in the example of Fig. 4A, the size of the slot offset field may be 4 bits, and the slot offset value notified by the MAC CE may be from 0 to 15. This can reduce the number of octets (overhead) of the MAC CE.

[0054] [Variation 2] The size of the slot offset field may be variable. The size of the slot offset field may be based on RRC parameters. In the example of Figure 4B, the number of bits used for the slot offset field in octet 3 is variable.

[0055] An RRC parameter for determining the size (number of bits) of the slot offset field may be set. The RRC parameter may indicate the maximum value of the slot format indicated by the MAC CE. For example, if the RRC parameter indicates 15, values ​​from 0 to 15 may be indicated by the MAC CE, and the size of the slot offset field may be 4 bits.

[0056] The RRC parameter may indicate the minimum value of the slot format value indicated by the MAC CE. The maximum value of the slot format value indicated by the MAC CE may be specified in the specification. For example, if the RRC parameter indicates 15 and the maximum value is 32, values ​​from 15 to 32 may be indicated by the MAC CE and the size of the slot offset field may be 5 bits.

[0057] The RRC parameters may indicate the size of the slot format indicated by the MAC CE. For example, if the RRC parameters indicate 3, the size of the slot offset field may be 3 bits.

[0058] MAC CE2 The new MAC CE may update / indicate / signal a specific parameter in the SRS resource set. One or more candidates for the specific parameter signaled by the MAC CE may be configured by an RRC parameter.

[0059] The RRC parameters may be a bitmap. The positions of bits set to 1 in the bitmap may correspond to candidates for a particular parameter. For example, the value of the slot offset may range from 0 to 32, and the size of the bitmap may be 33 bits. The MAC CE may indicate the value of the particular parameter by an index (list index) corresponding to the position of the bit set to 1.

[0060] As in the example of Fig. 5A, the number of candidates set by the RRC parameters may be 16 or less among the slot offset values ​​from 0 to 32. In this case, as in the example of Fig. 5B, the list index specified by the slot offset field may be from 1 to 16 (or from 0 to 15), and the size of the slot offset field may be 4 bits. This can reduce the number of octets (overhead) of MAC CE.

[0061] The RRC parameters may be a sequence (list) of candidates for a particular parameter. One value in the list may be signaled by the MAC CE.

[0062] The maximum number of candidates may be specified in the specification or may be set by higher layer signaling.

[0063] According to the above first embodiment, the SRS resource set or the SRS resource can be indicated by the MAC CE.

[0064] <Second embodiment> The specific parameters configured for (each) SRS resource set or SRS resource may be controlled by at least one of the MAC CE and the DCI.

[0065] One value of a specific parameter may be notified by the RRC and MAC CE. DCI may not be used to notify the specific parameter.

[0066] The specific parameter may be a parameter of a resource in the time domain / frequency domain of the SRS (eg, a slot offset).

[0067] The value of a particular parameter may follow any of the notification methods 1 to 3 described above and the following notification method 4.

[0068] [Notification method 4] Multiple values ​​(multiple candidates, lists) of a particular parameter may be signaled / activated by at least one of the RRC and the MAC CE. One of the multiple values ​​may be indicated by the DCI.

[0069] A new field in the DCI (DCI field) for indicating a specific parameter may be defined / added. If a new RRC parameter (e.g., Rel. 17 RRC parameter) is configured, the new DCI field may be present in the DCI. Otherwise, the new DCI field may not be present in the DCI.

[0070] For certain parameters, the value of the new parameter may be signaled by an existing DCI field (in Rel.15 / 16), which allows specification changes to be minimized.

[0071] The existing DCI field may be an SRS request field. The change in the specification may be to increase the number of SRS resource sets for a particular usage.

[0072] 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 a PUSCH), or may be a TDRA field in a DL assignment (DCI for scheduling a PDSCH).

[0073] The slot offset may be the slot indicated by the TDRA field of the UL grant + K slots or the indicated slot - K slots. The slot offset may be the slot indicated by the CSI request field of the UL grant + K slots or the indicated slot - K slots. The slot offset may be the slot indicated by the TDRA field of the DL assignment + K slots or the indicated slot - K slots. K may be specified in the specification or set by higher layer signaling. K may be 0 or any other value.

[0074] Number of configurable SRS resource sets In Rel.15 / 16, for an SRS resource set having a usage of codebook transmission or non-codebook transmission, only one SRS resource set is configured by a higher layer parameter. In Rel.15 / 16, for an SRS resource set having a usage of antenna switching, the number (maximum number) of configurable SRS resource sets is determined according to the UE capability reported by the UE. For example, each of multiple SRS resource sets corresponds to a different slot, and antenna switching of SRS is performed across multiple slots. At least one of 1T (transmitting antenna), 6R (receiving antenna), 1T8R, 2T6R, 2T8R, 4T6R, and 4T8R may be added to the UE capability of Rel.17.

[0075] If no new RRC parameters are configured for SRS resource sets that have codebook transmission, non-codebook transmission, or antenna switching, the constraint on the number (maximum number) of configurable SRS resource sets in Rel. 15 / 16 may apply.

[0076] When the new RRC parameters are configured, the number of configurable SRS resource sets may be greater than the number (maximum number) of configurable SRS resource sets in Rel.15 / 16. For each of codebook transmission, non-codebook transmission, or antenna switching, the maximum number of SRS resource sets corresponding to one code point of the SRS request field in the DCI may be the number (maximum number) of configurable SRS resource sets in Rel.15 / 16. One code point of the SRS request field may be one value (ID) of an A-SRS resource trigger (aperiodicSRSResourceTrigger) configured by higher layer signaling.

[0077] For example, the slot offset can be controlled by DCI (SRS request field), and SRS antenna switching across multiple slots can be performed by one DCI code point.

[0078] According to the above second embodiment, the SRS resource set or the SRS resource can be indicated by the DCI.

[0079] <Third embodiment> The specific parameter may be an SRS resource set or an A-SRS resource trigger.

[0080] 《Activation / Deactivation of SRS Resource Set》 Multiple SRS resource sets may be configured by the RRC, and some of the multiple SRS resource sets may be activated / deactivated by the MAC CE. The aforementioned constraints on the number of SRS resource sets may apply to the number of active SRS resource sets.

[0081] The MAC CE may include a field indicating the SRS resource set ID to be activated.

[0082] As in the example of FIG. 6A, the MAC CE may include at least one of an R field, a serving cell ID field, a BWP ID field, and an active SRS resource set ID field. The MAC CE may include multiple active SRS resource set ID fields. Multiple SRS resource sets may be activated simultaneously. Each of multiple octets in the MAC CE may include one active SRS resource set ID field.

[0083] As shown in the example of FIG. 6B, the MAC CE includes an R field, a serving cell ID field, a BWP ID field, and a B x B xThe field may be a bitmap. Multiple SRS resource sets may be activated simultaneously. The correspondence between the value of x and the SRS resource set ID may be set by higher layer signaling. The value of x may be associated with the SRS resource set ID in ascending order. Depending on the number of SRS resource sets configured by higher layer signaling, B x The field may span multiple octets. The number of octets may vary depending on the number of SRS resource sets configured by higher layer signaling. x The order of the fields may be either ascending x or descending x.

[0084] 《SRS resource set ID or A-SRS resource trigger value》 The correspondence between the code points of the SRS request field and the value of the SRS resource set ID (or A-SRS resource trigger) may be signaled / updated by the new MAC CE. The mapping between the DCI code points and one or more SRS resource sets may be signaled / updated by the MAC CE.

[0085] As shown in the example of Fig. 7A, the relationship (e.g., table) between the code points of the SRS request field and the contents of the MAC CE may be specified in the specification. A value of 00 in the SRS request field may indicate that no A-SRS resource set is triggered. Values ​​of 01, 10, and 11 in the SRS request field may indicate that the SRS resource sets indicated in the first, second, and third SRS resource set IDs notified by the MAC CE are triggered, respectively.

[0086] A UE that receives this MAC CE may determine the value of the SRS resource set or A-SRS resource trigger corresponding to the value of the SRS request field based on the correspondence indicated by this MAC CE, rather than the table specified in Rel.15 / 16.

[0087] As shown in the example of FIG. 7B, the new MAC CE includes an R field, a serving cell ID field, a BWP ID field, and a B yx B yx The field may be a bitmap. Multiple SRS resource sets may be activated simultaneously. The correspondence between the values ​​of y and x and the SRS resource set IDs may be configured by higher layer signaling. yx The field may be associated with the y-th SRS resource set ID. The value of x may be associated with the ascending order of SRS resource set IDs. The value of y may be associated with the ascending order of SRS resource set IDs. Depending on the number of SRS resource sets configured by higher layer signaling, B yx The field may span multiple octets. The number of octets may vary depending on the number of SRS resource sets configured by higher layer signaling. yx The order of the fields may be ascending x, descending x, ascending y, or descending y.

[0088] In this example, a single bit position set to 1 in octet 2 may indicate a first SRS resource set ID (corresponding to a value of 01 in the SRS request field), a single bit position set to 1 in octet 3 may indicate a second SRS resource set ID (corresponding to a value of 10 in the SRS request field), and a single bit position set to 1 in octet 4 may indicate a third SRS resource set ID (corresponding to a value of 11 in the SRS request field).

[0089] [Variation 1] The new MAC CE may include a field indicating whether each SRS resource set ID is associated with a value in the SRS request field.

[0090] As in the example of FIG. 8A, the new MAC CE includes an R field, a serving cell ID field, a BWP ID field, and a T i Field and B x and at least one of the following fields: i If the field is multiple B x It may be associated with a field. i If the field is set to 1, the following seven B x The T field may be present. i If the field is set to 0, the following seven B x The field need not be present.

[0091] At least one T i If the field is 0, the SRS resource set IDs specified by the MAC CE may be associated with the values ​​of the SRS request field in ascending or descending order. i When the field is set to 1, two values ​​of the SRS Request field may be associated with the SRS Resource Set ID indicated by the MAC CE, starting from the maximum SRS Request field value of 11 (starting from the bottom row of the table), as in the example of Figure 8B. The remaining values ​​of the SRS Request field may follow the association (table) in Rel. 15 / 16.

[0092] [Variation 2] One or more SRS resource set ID lists may be configured by RRC. The SRS resource set ID list may include one or more groups of SRS resource sets. A group may include one or more SRS resources. An index (list index, group index) may be associated with each group. The list index may be signaled by the MAC CE.

[0093] 9A, an SRS resource set ID list RRC is configured including four groups, which correspond to list indexes 0 to 3, respectively.

[0094] As shown in the example of FIG. 9B, the new MAC CE includes an R field, a serving cell ID field, a BWP ID field, and a T i A T i A field may be associated with one list index field. i If the field is set to 1, there may be one subsequent list index field. i If the field is set to 0, then one subsequent list index field may not be present.

[0095] The list index field may indicate a list index. In this example, the list index field in octet 2 may indicate a first group of SRS resource set IDs (corresponding to a value of 01 in the SRS request field), the list index field in octet 3 may indicate a second group of SRS resource set IDs (corresponding to a value of 10 in the SRS request field), and the list index field in octet 4 may indicate a third group of SRS resource set IDs (corresponding to a value of 11 in the SRS request field).

[0096] When the size of the SRS request field is N bits, the number of list index fields in the MAC CE may be 2^N-1 or may be less than 2^N-1. When the number of list index fields in the MAC CE is less than 2^N-1, the group indicated by the list index field may be associated with the value of the SRS request field, starting from the maximum value 11 of the SRS request field (from the bottom row of the table), as in Figure 8. The remaining values ​​of the SRS request field may follow the association (table) in Rel. 15 / 16.

[0097] A-SRS resource trigger value The A-SRS resource trigger value (A-SRS resource trigger ID, for example, 1, 2, or 3) of the SRS resource set may be signaled by the MAC CE.

[0098] The relationship (table) between the value of the SRS request field and the SRS resource set ID may not be defined in the specification. An existing relationship (table) between the value of the SRS request field and the SRS resource set may be applied.

[0099] The same A-SRS resource trigger value may be configured for multiple SRS resource sets (especially when the application is antenna switching).

[0100] The value of the A-SRS resource trigger may be subject to at least one of the following actions 1 and 2.

[0101] [Operation 1] The value of the A-SRS resource trigger may be updated only for the SRS resource set notified by the MAC CE, so that the value of the A-SRS resource trigger can be flexibly indicated by the MAC CE.

[0102] [Operation 2] When the A-SRS resource trigger value is notified by the MAC CE, the A-SRS resource trigger values ​​of all SRS resource sets that have the same value as the A-SRS resource trigger before the notification may be updated, thereby reducing the overhead of the MAC CE.

[0103] The combination of SRS resource sets updated by one MAC CE may be set by a higher layer parameter (e.g., an applicable SRS resource set list). Operation 2 may be performed only when this higher layer parameter is set.

[0104] Operation 2 is not limited to the notification of the A-SRS resource trigger ID, and may be applied to parameters updated by the MAC CE for each SRS resource set.

[0105] As shown in FIG. 10, the new MAC CE may include at least one of an R field, a serving cell ID field, a BWP ID field, an SRS resource set ID, and an A-SRS resource trigger ID field.

[0106] The A-SRS resource trigger ID field may overwrite the value configured by the RRC. An A-SRS resource trigger ID list may be configured by the RRC, and the index (position) in the list may be specified by the A-SRS resource trigger ID field of the MAC CE. If no A-SRS resource trigger ID is signaled by the RRC, the signaling of the A-SRS resource trigger ID using the MAC CE may be applied.

[0107] Triggering DCI An SRS request field that triggers the A-SRS may be included in the UL grant (UL DCI) / DL assignment (DL DCI).

[0108] The existing UL / DL DCI cannot trigger A-SRS without PUSCH / PDSCH scheduling.

[0109] If a condition is met, the SRS request field included in the UL / DL DCI may be used to select parameters of the SRS resource set / SRS resource. The condition may be that a specific RRC parameter is received. This allows more flexible control of the A-SRS without changing the field size of the existing DCI.

[0110] A new radio network temporally identifier (RNTI) for triggering A-SRS may be defined (e.g., SRS-RNTI). A DCI having a cyclic redundancy check (CRC) scrambled by the SRS-RNTI may be used only for triggering A-SRS (no scheduling is required). When a new RNTI is defined, it is possible to prevent an increase in the number of blind detections compared to the case where a new DCI format is defined.

[0111] A new DCI format for triggering A-SRS may be defined.

[0112] The DCI format used to trigger the A-SRS may be a specific DCI format. The specific DCI format may be a DCI format that can trigger the A-SRS among existing DCI formats.

[0113] Selection of parameters of SRS resource set / SRS resource may be performed using a mechanism of reinterpreting fields other than the SRS request field and triggering SRS by the SRS request field. A value of 00 in the existing SRS request field indicates no SRS trigger. A DCI with a CRC scrambled by the SRS-RNTI does not require a no SRS trigger state. A value of 00 in the SRS request field in a DCI with a CRC scrambled by the SRS-RNTI may be associated with an SRS resource set.

[0114] 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, and may be 4 bits or more.

[0115] In the association (table) between the SRS request field and the SRS resource set (or the A-SRS resource trigger) in Rel.15 / 16, an SRS resource set may 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 configured with the higher layer parameter SRS-TPC-PDCCH-Group (srs-TPC-PDCCH-Group) set to type B may be an SRS resource set configured with the higher layer parameter A-SRS resource trigger set to 1, or one entry in the higher layer parameter A-SRS resource trigger list configured to 1. The A-SRS resource set triggered for DCI format 2_3 with the higher layer parameter SRS-TPCPDCCH group (srs-TPC-PDCCH-Group) set to type A for the value 00 in the SRS request field may be an SRS resource set with the usage (within the SRS resource set) set to antenna switching (higher layer parameter usage) and the resource type (within the SRS resource set) set to "aperiodic" for the first set of serving cells configured by the higher layers, or an SRS resource set configured by an SRS resource set for positioning and with the resource type (within the SRS resource set for positioning) set to "aperiodic" for the first set of serving cells configured by the higher layers.

[0116] In this case, there is a DCI field indicating one or more SRS resource sets to be triggered, and the UE may transmit the A-SRS corresponding to the one or more SRS resource sets indicated by the field.

[0117] Multiple values ​​(candidates) of the slot offset are notified by the RRC / MAC CE, and a DCI field exists that indicates one of the multiple values, and the UE may transmit the A-SRS using the slot offset indicated by the field.

[0118] According to the above third embodiment, the SRS resource set can be notified by the MAC CE / DCI.

[0119] <Fourth embodiment> Variation 1 In the case where an SRS resource set or a specific parameter to be set for (each) an SRS resource set is indicated by the DCI, a field of at least one of the MAC CEs of the first to third embodiments may be extended such that multiple candidates for the SRS resource set / SRS resources / SRS parameters are activated by the field and the DCI may indicate one of the multiple candidates.

[0120] Variation 2 At least one of the first to third embodiments may be applied only if a corresponding UE capability is reported by the UE.

[0121] The UE capabilities may indicate whether at least one of the first to third embodiments is supported.

[0122] The UE capability may indicate the number (maximum number) of SRS resource sets / SRS resources supported in at least one of the first to third embodiments.

[0123] 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.

[0124] At least one of the first to third embodiments may be applied only if the UE is configured with the corresponding higher layer parameters, otherwise the UE may apply the Rel.15 / 16 behavior.

[0125] Variation 3 To increase the flexibility of the A-SRS, at least one of the following extensions 1 and 2 may be considered.

[0126] [Extension 1] An extension introducing a MAC CE. This extension may follow at least one of the following options 1 to 3:

[0127] [[Option 1]] A MAC CE may activate one or more SRS resource sets. Only the active SRS resource set may be triggered by the SRS request field of the DCI.

[0128] 11, in Rel.15 / 16, SRS resource set #1 having a codebook usage is configured. In option 1, SRS resource sets #1 and #2 having a codebook usage are configured, and SRS resource set #2 may be activated by the MAC CE.

[0129] [[Option 2]] The MAC CE may update the mapping between DCI code points and A-SRS resource triggers.

[0130] 12, 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 be associated with a value other than 00 in the 2-bit SRS request field.

[0131] [[Option 3]] The MAC CE may update a specific parameter of the SRS, for example, the specific parameter may be a slot offset.

[0132] 13, in Rel.15 / 16, the SRS resource set #1 is configured with a codebook usage and a slot offset of 1. In option 3, the slot offset of the SRS resource set #1 may be updated by the MAC CE.

[0133] In option 1 / 2, the number (maximum number) of SRS resource sets that can be configured for a given use is increased.

[0134] [Extension 2] Triggering DCI extension.

[0135] The number of bits in the SRS request field may be increased.

[0136] In addition to the SRS request fields, new DCI fields may be added.

[0137] A new RNTI (eg, SRS-RNTI) may be introduced to create a DCI dedicated to A-SRS triggering.

[0138] A new DCI format may be introduced to create a DCI specifically for A-SRS triggering.

[0139] In addition to the SRS request field, existing DCI fields for controlling SRS triggering may be reused.

[0140] Variation 4 A MAC CE activation time for applying at least one of the MAC CEs of the first to third embodiments may be required.

[0141] The UE may follow at least one of the following actions 1 and 2.

[0142] [Operation 1] The UE uses the SRS resources (parameters) updated by the MAC CE for SRS transmission triggered by a DCI received after the MAC CE activation time has elapsed since receipt of the MAC CE.

[0143] [Operation 2] The UE uses the SRS resources (parameters) updated by the MAC CE for SRS transmission after the MAC CE activation time has elapsed since receipt of the MAC CE.

[0144] The MAC CE activation time may be different among A-SRS, SP-SRS, and P-SRS. For example, in operation 1, the MAC CE activation time for S-SRS may be 3 subframe times (3 msec), and the MAC CE activation time for SP / P-SRS may be 3 subframe times (3 msec) + T. T may be specified in the specification, signaled by higher layers, or reported by UE capabilities.

[0145] (Wireless communication systems) A configuration of a wireless communication system according to an embodiment of the present disclosure will be described below. In this wireless communication system, communication is performed using any one of the wireless communication methods according to the above embodiments of the present disclosure or a combination of these methods.

[0146] 14 is a diagram showing an example of a schematic configuration of a wireless communication system according to an embodiment. The wireless communication system 1 may be a system that realizes communication using Long Term Evolution (LTE), 5th generation mobile communication system New Radio (5G NR), or the like, which are specified by the Third Generation Partnership Project (3GPP).

[0147] Furthermore, the wireless communication system 1 may support dual connectivity between a plurality of Radio Access Technologies (RATs) (Multi-RAT Dual Connectivity (MR-DC)). MR-DC may include dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (EN-DC)), dual connectivity between NR and LTE (NR-E-UTRA Dual Connectivity (NE-DC)), and the like.

[0148] 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.

[0149] The wireless communication system 1 may support dual connectivity between multiple base stations in the same RAT (for example, dual connectivity in which both the MN and the SN are NR base stations (gNBs) (NR-NR Dual Connectivity (NN-DC))).

[0150] The wireless communication system 1 may include a base station 11 that forms a macrocell C1 with a relatively wide coverage, and base stations 12 (12a-12c) that are arranged in the macrocell C1 and form a small cell C2 that is narrower than the macrocell C1. A user terminal 20 may be located in at least one of the cells. The arrangement and number of each cell and user terminal 20 are not limited to the embodiment shown in the figure. Hereinafter, when there is no need to distinguish between the base stations 11 and 12, they will be collectively referred to as a base station 10.

[0151] 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 (CC) and dual connectivity (DC).

[0152] Each CC may be included in at least one of a first frequency band (Frequency Range 1 (FR1)) and a second frequency band (Frequency Range 2 (FR2)). The macro cell C1 may be included in FR1, and the small cell C2 may be included in FR2. For example, FR1 may be a frequency band of 6 GHz or less (sub-6 GHz), and FR2 may be a frequency band above 24 GHz (above-24 GHz). Note that the frequency bands and definitions of FR1 and FR2 are not limited to these, and for example, FR1 may correspond to a frequency band higher than FR2.

[0153] Furthermore, the user terminal 20 may perform communication in each CC using at least one of Time Division Duplex (TDD) and Frequency Division Duplex (FDD).

[0154] The multiple base stations 10 may be connected by wire (e.g., optical fiber conforming to Common Public Radio Interface (CPRI), X2 interface, etc.) or wirelessly (e.g., NR communication). For example, when NR communication is used as a backhaul between the base stations 11 and 12, the base station 11 corresponding to the upper station may be called an Integrated Access Backhaul (IAB) donor, and the base station 12 corresponding to the relay station (relay) may be called an IAB node.

[0155] The base station 10 may be connected to the core network 30 directly or via another base station 10. The core network 30 may include at least one of, for example, an Evolved Packet Core (EPC), a 5G Core Network (5GCN), a Next Generation Core (NGC), and the like.

[0156] The user terminal 20 may be a terminal compatible with at least one of communication methods such as LTE, LTE-A, and 5G.

[0157] In the wireless communication system 1, a wireless access scheme based on Orthogonal Frequency Division Multiplexing (OFDM) may be used. For example, in at least one of the downlink (DL) and the uplink (UL), Cyclic Prefix OFDM (CP-OFDM), Discrete Fourier Transform Spread OFDM (DFT-s-OFDM), Orthogonal Frequency Division Multiple Access (OFDMA), Single Carrier Frequency Division Multiple Access (SC-FDMA), etc. may be used.

[0158] The radio access scheme may be called a waveform. 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.

[0159] In the wireless communication system 1, 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. may be used as a downlink channel.

[0160] In addition, in the wireless communication system 1, 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. may be used as an uplink channel.

[0161] The PDSCH transmits user data, higher layer control information, a System Information Block (SIB), etc. The PUSCH may transmit user data, higher layer control information, etc. Furthermore, the PBCH may transmit a Master Information Block (MIB).

[0162] Lower layer control information may be transmitted by the PDCCH. The lower layer control information may include, for example, Downlink Control Information (DCI) including scheduling information of at least one of the PDSCH and the PUSCH.

[0163] In addition, DCI for scheduling PDSCH may be called DL assignment, DL DCI, etc., and DCI for scheduling PUSCH may be called UL grant, UL DCI, etc. In addition, PDSCH may be replaced with DL data, and PUSCH may be replaced with UL data.

[0164] A control resource set (CORESET) and a search space may be used to detect the PDCCH. The CORESET corresponds to resources to search for DCI. The search space corresponds to a search region and a search method for PDCCH candidates. One CORESET may be associated with one or multiple search spaces. The UE may monitor a CORESET associated with a certain search space based on the search space configuration.

[0165] One search space may correspond to PDCCH candidates corresponding to one or more aggregation levels. One or more search spaces may be called a search space set. Note that the terms "search space," "search space set," "search space setting," "search space set setting," "CORESET," and "CORESET setting" in the present disclosure may be read as interchangeable terms.

[0166] The PUCCH may transmit uplink control information (UCI) including at least one of channel state information (CSI), delivery acknowledgement information (which may be called, for example, Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), ACK / NACK, etc.), and a scheduling request (SR). The PRACH may transmit a random access preamble for establishing a connection with a cell.

[0167] In the present disclosure, a downlink, an uplink, etc. may be expressed without adding "link." Also, various channels may be expressed without adding "Physical" to the beginning of the channels.

[0168] In the wireless communication system 1, a synchronization signal (SS), a downlink reference signal (DL-RS), etc. may be transmitted. In the wireless communication system 1, as the DL-RS, a cell-specific reference signal (CRS), a channel state information reference signal (CSI-RS), a demodulation reference signal (DMRS), a positioning reference signal (PRS), a phase tracking reference signal (PTRS), etc. may be transmitted.

[0169] The synchronization signal may be, for example, at least one of a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS). A signal block including the SS (PSS, SSS) and the PBCH (and the DMRS for the PBCH) may be called an SS / PBCH block, an SS Block (SSB), or the like. In addition, the SS, SSB, and the like may also be called a reference signal.

[0170] Furthermore, in the wireless communication system 1, a sounding reference signal (SRS), a demodulation reference signal (DMRS), etc. may be transmitted as an uplink reference signal (UL-RS). Note that the DMRS may be called a user equipment specific reference signal (UE-specific reference signal).

[0171] (base station) 15 is a diagram showing an example of the configuration of a base station according to an embodiment. The base station 10 includes a control unit 110, a transceiver unit 120, a transceiver antenna 130, and a transmission line interface 140. Note that one or more of each of the control unit 110, the transceiver unit 120, the transceiver antenna 130, and the transmission line interface 140 may be provided.

[0172] In this example, the functional blocks of the characteristic parts of the present embodiment are mainly shown, and the base station 10 may be assumed to have other functional blocks necessary for wireless communication. Some of the processes of each unit described below may be omitted.

[0173] The control unit 110 performs overall control of the base station 10. The control unit 110 can be configured with a controller, a control circuit, and the like that are explained based on common understanding in the technical field to which the present disclosure relates.

[0174] The control unit 110 may control signal generation, scheduling (e.g., resource allocation, mapping), etc. The control unit 110 may control transmission and reception using the transmission and reception unit 120, the transmission and reception antenna 130, and the transmission path interface 140, measurement, etc. The control unit 110 may generate data, control information, sequences, etc. to be transmitted as signals, and transfer them to the transmission and reception unit 120. The control unit 110 may perform call processing (setting, release, etc.) of communication channels, status management of the base station 10, management of radio resources, etc.

[0175] The transceiver unit 120 may include a baseband unit 121, a radio frequency (RF) unit 122, and a measurement unit 123. The baseband unit 121 may include a transmission processing unit 1211 and a reception processing unit 1212. The transceiver unit 120 may be configured with a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transceiver circuit, etc., which are described based on common understanding in the technical field related to the present disclosure.

[0176] The transmitting / receiving unit 120 may be configured as an integrated transmitting / receiving unit, or may be configured from a transmitting unit and a receiving unit. The transmitting unit may be configured from a transmission processing unit 1211 and an RF unit 122. The receiving unit may be configured from a reception processing unit 1212, an RF unit 122, and a measurement unit 123.

[0177] The transmitting / receiving antenna 130 can be composed of an antenna described based on common understanding in the technical field to which the present disclosure pertains, such as an array antenna.

[0178] The transceiver 120 may transmit the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transceiver 120 may receive the above-mentioned uplink channel, uplink reference signal, etc.

[0179] The transceiver 120 may form at least one of a transmission beam and a reception beam using digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), or the like.

[0180] The transceiver 120 (transmission processing unit 1211) may perform Packet Data Convergence Protocol (PDCP) layer processing, Radio Link Control (RLC) layer processing (e.g., RLC retransmission control), Medium Access Control (MAC) layer processing (e.g., HARQ retransmission control), etc. on data, control information, etc. obtained from the control unit 110, and generate a bit string to be transmitted.

[0181] The transceiver 120 (transmission processing unit 1211) may perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering, Discrete Fourier Transform (DFT) processing (if necessary), Inverse Fast Fourier Transform (IFFT) processing, precoding, and digital-to-analog conversion on the bit string to be transmitted, and output a baseband signal.

[0182] The transceiver unit 120 (RF unit 122) may perform modulation to a radio frequency band, filtering, amplification, and the like on the baseband signal, and transmit the radio frequency band signal via the transceiver antenna .

[0183] On the other hand, the transceiver unit 120 (RF unit 122) may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency signal received by the transceiver antenna .

[0184] The transceiver 120 (reception processing unit 1212) may apply reception processing such as analog-to-digital conversion, Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing (if necessary), filtering, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal, thereby acquiring user data, etc.

[0185] The transceiver 120 (measurement unit 123) may perform measurements on the received signal. For example, the measurement unit 123 may perform Radio Resource Management (RRM) measurements, Channel State Information (CSI) measurements, etc., based on the received signal. The measurement unit 123 may 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 be output to the control unit 110.

[0186] The transmission path interface 140 may transmit and receive signals (backhaul signaling) between devices included in the core network 30, other base stations 10, etc., and may acquire and transmit user data (user plane data) for the user terminal 20, control plane data, etc.

[0187] The transmitting section and receiving section of the base station 10 in the present disclosure may be configured by at least one of the transmitting / receiving section 120, the transmitting / receiving antenna 130, and the transmission path interface 140.

[0188] The transceiver 120 may transmit a medium access control element (MAC CE) related to a sounding reference signal (SRS) resource set or parameters for the SRS resources. The controller 110 may control SRS reception based on the parameters.

[0189] The transceiver 120 may 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 the downlink control information, and transmit the downlink control information. The controller 110 may control SRS reception based on the parameters.

[0190] (User terminal) 16 is a diagram showing an example of the configuration of a user terminal according to an embodiment. The user terminal 20 includes a control unit 210, a transceiver unit 220, and a transceiver antenna 230. Note that the user terminal 20 may include one or more of each of the control unit 210, the transceiver unit 220, and the transceiver antenna 230.

[0191] In this example, the functional blocks of the characteristic parts of the present embodiment are mainly shown, and the user terminal 20 may be assumed to have other functional blocks necessary for wireless communication. Some of the processes of each unit described below may be omitted.

[0192] The control unit 210 performs overall control of the user terminal 20. The control unit 210 can be configured with a controller, a control circuit, and the like that are explained based on common understanding in the technical field to which the present disclosure relates.

[0193] The control unit 210 may control signal generation, mapping, etc. The control unit 210 may control transmission / reception, measurement, etc. using the transmission / reception unit 220 and the transmission / reception antenna 230. The control unit 210 may generate data, control information, sequences, etc. to be transmitted as signals, and transfer them to the transmission / reception unit 220.

[0194] The transmitting / receiving unit 220 may include a baseband unit 221, an RF unit 222, and a measurement unit 223. The baseband unit 221 may include a transmission processing unit 2211 and a reception processing unit 2212. The transmitting / receiving unit 220 may be configured with a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmitting / receiving circuit, and the like, which are described based on common understanding in the technical field related to the present disclosure.

[0195] The transmitting / receiving unit 220 may be configured as an integrated transmitting / receiving unit, or may be composed of a transmitting unit and a receiving unit. The transmitting unit may be composed of a transmission processing unit 2211 and an RF unit 222. The receiving unit may be composed of a reception processing unit 2212, an RF unit 222, and a measurement unit 223.

[0196] The transmitting / receiving antenna 230 can be composed of an antenna described based on common understanding in the technical field to which this disclosure pertains, such as an array antenna.

[0197] The transceiver 220 may receive the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transceiver 220 may transmit the above-mentioned uplink channel, uplink reference signal, etc.

[0198] The transceiver 220 may form at least one of a transmission beam and a reception beam using digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), or the like.

[0199] The transceiver unit 220 (transmission processing unit 2211) may perform PDCP layer processing, RLC layer processing (e.g., RLC retransmission control), MAC layer processing (e.g., HARQ retransmission control), etc. on data, control information, etc. obtained from the control unit 210, and generate a bit string to be transmitted.

[0200] The transceiver 220 (transmission processing unit 2211) may perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering, DFT processing (if necessary), IFFT processing, precoding, and digital-to-analog conversion on the bit sequence to be transmitted, and output a baseband signal.

[0201] Whether or not to apply the DFT process may be based on the setting of transform precoding. When transform precoding is enabled for a certain channel (e.g., PUSCH), the transceiver 220 (transmission processor 2211) may perform the DFT process as the transmission process to transmit the channel using a DFT-s-OFDM waveform, and may not perform the DFT process as the transmission process if transform precoding is enabled for the channel.

[0202] The transceiver unit 220 (RF unit 222) may perform modulation to a radio frequency band, filtering, amplification, and the like on the baseband signal, and transmit the radio frequency band signal via the transceiver antenna 230.

[0203] On the other hand, the transceiver unit 220 (RF unit 222) may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency signal received by the transceiver antenna 230.

[0204] The transceiver 220 (reception processing unit 2212) may apply reception processing such as analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filtering, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal, and acquire user data, etc.

[0205] The transceiver 220 (measurement unit 223) may perform measurements on the received signal. For example, the measurement unit 223 may perform RRM measurements, CSI measurements, etc. based on the received signal. The measurement unit 223 may 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 be output to the control unit 210.

[0206] In addition, the transmitting section and the receiving section of the user terminal 20 in the present disclosure may be configured by at least one of the transmitting / receiving section 220 and the transmitting / receiving antenna 230.

[0207] The transceiver 220 may receive a medium access control element (MAC CE) for a sounding reference signal (SRS) resource set or parameters for the SRS resources. The controller 210 may control SRS transmission based on the parameters.

[0208] The transceiver 220 may receive a radio resource control information element indicating a plurality of SRS resource sets, and the MAC CE may activate one or more of the plurality of SRS resource sets.

[0209] The transceiver 220 may receive a radio resource control information element indicating the parameter. The MAC CE may update the parameter.

[0210] The parameter may be a slot offset for the SRS resource set.

[0211] The transceiver 220 may 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 SRS resource and one or more values ​​of a field in the downlink control information, and may receive the downlink control information. The controller 210 may determine a value of the parameter based on the MAC CE and the downlink control information.

[0212] The parameter may be at least one of an aperiodic SRS resource trigger and an SRS resource set.

[0213] The MAC CE may indicate multiple SRS resource sets, and multiple values ​​of the field may be mapped to the multiple SRS resource sets.

[0214] 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.

[0215] (Hardware configuration) The block diagrams used to explain the above embodiments show functional blocks. These functional blocks (components) are realized by any combination of at least one of hardware and software. The method of realizing each functional block is not particularly limited. That is, each functional block may be realized by using one device that is physically or logically combined, or may be realized by using two or more devices that are physically or logically separated and directly or indirectly connected (for example, by wire, wirelessly, etc.). The functional blocks may be realized by combining the one device or the multiple devices with software.

[0216] Here, the functions include, but are not limited to, judgment, determination, judgment, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, selection, establishment, comparison, assumption, expectation, deeming, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, and assignment. For example, a functional block (component) that performs the function of transmission may be called a transmitting unit, a transmitter, and the like. In either case, as described above, the method of realization is not particularly limited.

[0217] For example, a base station, a user terminal, etc. in an embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure. Fig. 17 is a diagram showing an example of a hardware configuration of a base station and a user terminal according to an embodiment. The above-mentioned base station 10 and user terminal 20 may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, etc.

[0218] In this disclosure, the terms "apparatus," "circuit," "device," "section," "unit," and the like can be read interchangeably. The hardware configurations of the base station 10 and the user terminal 20 may be configured to include one or more of the devices shown in the drawings, or may be configured to exclude some of the devices.

[0219] For example, although only one processor 1001 is shown, there may be multiple processors. Also, the processes may be performed by one processor, or the processes may be performed by two or more processors simultaneously, sequentially, or in other manners. Also, the processor 1001 may be implemented by one or more chips.

[0220] Each function in the base station 10 and the user terminal 20 is realized, for example, by loading a specific software (program) onto hardware such as a processor 1001 and a memory 1002, so that the processor 1001 performs calculations, controls communications via a communication device 1004, and controls at least one of reading and writing of data in the memory 1002 and the storage 1003.

[0221] The processor 1001, for example, operates an operating system to control the entire computer. The processor 1001 may be configured with a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic unit, a register, etc. For example, at least a part of the above-mentioned control unit 110 (210), transmission / reception unit 120 (220), etc. may be realized by the processor 1001.

[0222] Moreover, the processor 1001 reads out programs (program codes), software modules, data, etc. from at least one of the storage 1003 and the communication device 1004 into the memory 1002, and executes various processes according to the programs. As the programs, programs that cause a computer to execute at least a part of the operations described in the above-mentioned embodiments are used. For example, the control unit 110 (210) may be realized by a control program stored in the memory 1002 and operated by the processor 1001, and the other functional blocks may be realized in a similar manner.

[0223] The memory 1002 is a computer-readable recording medium, and may be configured by at least one of, for example, a Read Only Memory (ROM), an Erasable Programmable ROM (EPROM), an Electrically EPROM (EEPROM), a Random Access Memory (RAM), and other suitable storage media. The memory 1002 may be called a register, a cache, a main memory (primary storage device), and the like. The memory 1002 can store a program (program code), a software module, and the like that is executable to implement a wireless communication method according to an embodiment of the present disclosure.

[0224] Storage 1003 is a computer-readable recording medium and may be constituted by at least one of, for example, a flexible disk, a floppy disk, a magneto-optical disk (e.g., a compact disk (e.g., a Compact Disc ROM (CD-ROM)), a digital versatile disk, a Blu-ray disk), a removable disk, a hard disk drive, a smart card, a flash memory device (e.g., a card, stick, key drive), a magnetic stripe, a database, a server, or other suitable storage medium. Storage 1003 may also be referred to as an auxiliary storage device.

[0225] The communication device 1004 is hardware (transmission / reception device) for performing communication between computers via at least one of a wired network and a wireless network, and is also called, for example, a network device, a network controller, a network card, a communication module, etc. The communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc., in order to realize at least one of Frequency Division Duplex (FDD) and Time Division Duplex (TDD). For example, the above-mentioned transmission / reception unit 120 (220), transmission / reception antenna 130 (230), etc. may be realized by the communication device 1004. The transmission / reception unit 120 (220) may be implemented as a transmission unit 120a (220a) and a reception unit 120b (220b) that are physically or logically separated.

[0226] The input device 1005 is an input device (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that accepts input from the outside. The output device 1006 is an output device (e.g., a display, a speaker, a Light Emitting Diode (LED) lamp, etc.) that performs output to the outside. The input device 1005 and the output device 1006 may be integrated into one device (e.g., a touch panel).

[0227] In addition, each device such as the processor 1001 and the memory 1002 is connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or may be configured using different buses between each device.

[0228] Furthermore, the base station 10 and the user terminal 20 may be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), a field programmable gate array (FPGA), etc., and some or all of the functional blocks may be realized using the hardware. For example, the processor 1001 may be implemented using at least one of these pieces of hardware.

[0229] (Modification) In addition, the terms explained in this disclosure and the terms necessary for understanding this disclosure may be replaced with terms having the same or similar meanings. For example, a channel, a symbol, and a signal (signal or signaling) may be read as mutually interchangeable. A signal may also be a message. A reference signal may also be abbreviated as RS, and may also be called a pilot, pilot signal, etc. depending on the applied standard. A component carrier (CC) may also be called a cell, a frequency carrier, a carrier frequency, etc.

[0230] A radio frame may be composed of one or more periods (frames) in the time domain. Each of the one or more periods (frames) constituting a radio frame may be called a subframe. Furthermore, a subframe may be composed of one or more slots in the time domain. A subframe may have a fixed time length (e.g., 1 ms) that is independent of numerology.

[0231] Here, the numerology may be a communication parameter applied to at least one of the transmission and reception of a signal or channel, and may indicate at least one of, for example, a subcarrier spacing (SCS), a bandwidth, a symbol length, a cyclic prefix length, a transmission time interval (TTI), a number of symbols per TTI, a radio frame structure, a specific filtering process performed by a transceiver in the frequency domain, and a specific windowing process performed by a transceiver in the time domain.

[0232] A slot may be composed of one or more symbols (such as an Orthogonal Frequency Division Multiplexing (OFDM) symbol, a Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol, etc.) in the time domain. A slot may also be a time unit based on numerology.

[0233] A slot may include multiple minislots. Each minislot may be composed of one or multiple symbols in the time domain. A minislot may also be called a subslot. A minislot may be composed of fewer symbols than a slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a minislot may be called PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a minislot may be called PDSCH (PUSCH) mapping type B.

[0234] A radio frame, a subframe, a slot, a minislot, and a symbol each represent a time unit for transmitting a signal. A different name may be used for the radio frame, the subframe, the slot, the minislot, and the symbol. Note that the time units such as a frame, a subframe, a slot, a minislot, and a symbol in the present disclosure may be read as interchangeable with each other.

[0235] For example, one subframe may be called a TTI, multiple consecutive subframes may be called a TTI, or one slot or one minislot may be called a TTI. That is, at least one of the subframe and the TTI may be a subframe (1 ms) in the existing LTE, a period shorter than 1 ms (for example, 1-13 symbols), or a period longer than 1 ms. Note that the unit representing the TTI may be called a slot, minislot, etc., instead of a subframe.

[0236] Here, TTI refers to, for example, the minimum time unit for scheduling in wireless communication. For example, in an LTE system, a base station performs scheduling to allocate radio resources (such as frequency bandwidth and transmission power that can be used by each user terminal) to each user terminal in TTI units. Note that the definition of TTI is not limited to this.

[0237] The TTI may be a transmission time unit for a channel-encoded data packet (transport block), a code block, a code word, etc., or may be a processing unit for scheduling, link adaptation, etc. When a TTI is given, the time interval (e.g., the number of symbols) in which a transport block, a code block, a code word, etc. are actually mapped may be shorter than the TTI.

[0238] In addition, when one slot or one minislot is called TTI, one or more TTIs (i.e., one or more slots or one or more minislots) may be the minimum time unit of scheduling. Also, the number of slots (minislots) constituting the minimum time unit of scheduling may be controlled.

[0239] A TTI having a time length of 1 ms may be called a normal TTI (TTI in 3GPP Rel. 8-12), a normal TTI, a long TTI, a normal subframe, a normal subframe, a long subframe, a slot, etc. A TTI shorter than a normal TTI may be called a shortened TTI, a short TTI, a partial or fractional TTI, a shortened subframe, a short subframe, a minislot, a subslot, a slot, etc.

[0240] In addition, a long TTI (e.g., a normal TTI, a subframe, etc.) may be interpreted as a TTI having a time length exceeding 1 ms, and a short TTI (e.g., a shortened TTI, etc.) may be interpreted as a TTI having a TTI length shorter than the TTI length of a long TTI and equal to or greater than 1 ms.

[0241] A resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and may include one or more consecutive subcarriers in the frequency domain. The number of subcarriers included in an RB may be the same regardless of the numerology, and may be, for example, 12. The number of subcarriers included in an RB may be determined based on the numerology.

[0242] In addition, an RB may include one or more symbols in the time domain, and may have a length of one slot, one minislot, one subframe, or one TTI. Each of one TTI, one subframe, etc. may be composed of one or more resource blocks.

[0243] In addition, one or more RBs may be called a physical resource block (PRB), a sub-carrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, etc.

[0244] 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.

[0245] A Bandwidth Part (BWP), which may also be referred to as a fractional bandwidth, may represent a subset of contiguous common resource blocks (RBs) for a numerology on a carrier, where the common RBs may be identified by the index of the RBs relative to a common reference point of the carrier. PRBs may be defined in a BWP and numbered within the BWP.

[0246] The BWP may include a UL BWP (a BWP for UL) and a DL BWP (a BWP for DL). One or more BWPs may be configured for a UE within one carrier.

[0247] At least one of the configured BWPs may be active, and the UE may not expect to transmit or receive a given channel / signal outside the active BWP. Note that the terms "cell", "carrier", etc. in this disclosure may be replaced with "BWP".

[0248] The above-mentioned structures of radio frames, subframes, slots, minislots, and symbols are merely examples. For example, the number of subframes included in a radio frame, the number of slots per subframe or radio frame, the number of minislots included in a slot, the number of symbols and RBs included in a slot or minislot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, the cyclic prefix (CP) length, and other configurations can be changed in various ways.

[0249] In addition, the information, parameters, etc. described in the present disclosure may be represented using absolute values, may be represented using relative values ​​from a predetermined value, or may be represented using other corresponding information. For example, a radio resource may be indicated by a predetermined index.

[0250] The names used for parameters and the like in this disclosure are not limiting in any way. Furthermore, the formulas and the like using these parameters may differ from those explicitly disclosed in this disclosure. The various channels (PUCCH, PDCCH, etc.) and information elements may be identified by any suitable names, and therefore the various names assigned to these various channels and information elements are not limiting in any way.

[0251] The information, signals, etc. described in this disclosure may be represented using any of a variety of different technologies. For example, the data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0252] Furthermore, information, signals, etc. may be output from a higher layer to a lower layer and / or from a lower layer to a higher layer. Information, signals, etc. may be input / output via a plurality of network nodes.

[0253] Input and output information, signals, etc. may be stored in a specific location (e.g., memory) or may be managed using a management table. Input and output information, signals, etc. may be overwritten, updated, or added to. Output information, signals, etc. may be deleted. Input information, signals, etc. may be transmitted to another device.

[0254] The notification of information is not limited to the aspects / embodiments described in the present disclosure, and may be performed using other methods. For example, the notification of information in the present disclosure may be performed by physical layer signaling (e.g., Downlink Control Information (DCI) and Uplink Control Information (UCI)), higher layer signaling (e.g., Radio Resource Control (RRC) signaling, broadcast information (Master Information Block (MIB) and System Information Block (SIB)), Medium Access Control (MAC) signaling), other signals, or a combination thereof.

[0255] The physical layer signaling may be called Layer 1 / Layer 2 (L1 / L2) control information (L1 / L2 control signal), L1 control information (L1 control signal), etc. The RRC signaling may be called an RRC message, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, etc. The MAC signaling may be notified, for example, by using a MAC Control Element (CE).

[0256] Furthermore, notification of specified information (e.g., notification that "it is X") is not limited to explicit notification, but may be made implicitly (e.g., by not notifying the specified information or by notifying other information).

[0257] The determination may be made based on a value represented by a single bit (0 or 1), a Boolean value represented as true or false, or by comparing numerical values ​​(e.g., with a predetermined value).

[0258] Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.

[0259] Additionally, software, instructions, information, etc. may be transmitted or received over a transmission medium. For example, if the software is transmitted from a website, server, or other remote source using wired technologies (such as coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL)), and / or wireless technologies (such as infrared, microwave, etc.), then these wired and / or wireless technologies are included within the definition of transmission media.

[0260] As used in this disclosure, the terms "system" and "network" may be used interchangeably. A "network" may refer to devices included in the network (e.g., base stations).

[0261] In this disclosure, terms such as "precoding," "precoder," "weight (precoding weight)," "Quasi-Co-Location (QCL)," "Transmission Configuration Indication state (TCI state)," "spatial relation," "spatial domain filter," "transmit power," "phase rotation," "antenna port," "antenna port group," "layer," "number of layers," "rank," "resource," "resource set," "resource group," "beam," "beam width," "beam angle," "antenna," "antenna element," "panel," and the like may be used interchangeably.

[0262] In this disclosure, terms such as "Base Station (BS)", "radio base station", "fixed station", "NodeB", "eNB (eNodeB)", "gNB (gNodeB)", "access point", "Transmission Point (TP)", "Reception Point (RP)", "Transmission / Reception Point (TRP)", "panel", "cell", "sector", "cell group", "carrier", "component carrier", etc. may be used interchangeably. A base station may also be referred to by terms such as a macro cell, a small cell, a femto cell, a pico cell, etc.

[0263] A base station can accommodate one or more (e.g., three) cells. When a base station accommodates multiple cells, the entire coverage area of ​​the base station can be partitioned into multiple smaller areas, and each smaller area can also be provided with communication services by a base station subsystem (e.g., a small base station for indoor use (Remote Radio Head (RRH))). The term "cell" or "sector" refers to a part or the entire coverage area of ​​a base station and / or a base station subsystem that provides communication services in this coverage.

[0264] In this disclosure, the terms "Mobile Station (MS)", "user terminal", "User Equipment (UE)", "terminal", etc. may be used interchangeably.

[0265] 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, handset, user agent, mobile client, client, or some other suitable terminology.

[0266] At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a wireless communication device, etc. At least one of the base station and the mobile station may be a device mounted on a moving body, the moving body itself, etc. The moving body may be a vehicle (e.g., a car, an airplane, etc.), an unmanned moving body (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). At least one of the base station and the mobile station may include a device that does not necessarily move during communication operation. For example, at least one of the base station and the mobile station may be an Internet of Things (IoT) device such as a sensor.

[0267] Furthermore, the base station in the present disclosure may be read as a user terminal. For example, each aspect / embodiment of the present disclosure may be applied to a configuration in which communication between a base station and a user terminal is replaced with communication between a plurality of user terminals (which may be called, for example, Device-to-Device (D2D) or Vehicle-to-Everything (V2X)). In this case, the user terminal 20 may be configured to have the functions of the base station 10 described above. Furthermore, terms such as "uplink" and "downlink" may be read as terms corresponding to terminal-to-terminal communication (for example, "side"). For example, an uplink channel, a downlink channel, etc. may be read as a side channel.

[0268] Similarly, the user terminal in the present disclosure may be interpreted as a base station. In this case, the base station 10 may be configured to have the functions of the user terminal 20 described above.

[0269] In the present disclosure, an operation performed by a base station may be performed by its upper node in some cases. It is clear that in a network including one or more network nodes having base stations, various operations performed for communication with terminals may be performed by the base station, one or more network nodes other than the base station (such as, but not limited to, a Mobility Management Entity (MME) and a Serving-Gateway (S-GW)), or a combination thereof.

[0270] Each aspect / embodiment described in this disclosure may be used alone, in combination, or switched according to implementation. In addition, the processing procedures, sequences, flow charts, etc. of each aspect / embodiment described in this disclosure may be reordered unless inconsistent. For example, the methods described in this disclosure present elements of various steps using an example order, and are not limited to the particular order presented.

[0271] Each aspect / embodiment described in the present disclosure may be implemented using any of a wide variety of standards, including 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 point)), Future Radio Access (FRA), New-Radio Access Technology (RAT), New Radio (NR), New radio access (NX), Future generation radio access (FX), Global System for Mobile communications (GSM (registered trademark)), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE The present invention may be applied to systems using 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), other appropriate wireless communication methods, next-generation systems that are based on these, etc. Also, the present invention may be applied to a combination of multiple systems (for example, a combination of LTE or LTE-A and 5G).

[0272] As used in this disclosure, the phrase "based on" does not mean "based only on," unless expressly stated otherwise. In other words, the phrase "based on" means both "based only on" and "based at least on."

[0273] Any reference to an element using a designation such as "first," "second," etc., used in this disclosure does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Thus, a reference to a first and a second element does not imply that only two elements may be employed or that the first element must precede the second element in some way.

[0274] The term "determining" as used in this disclosure may encompass a wide variety of actions. For example, "determining" may be considered to be judging, calculating, computing, processing, deriving, investigating, looking up, search, inquiry (e.g., looking up in a table, database, or another data structure), ascertaining, and the like.

[0275] A "determining" may also be considered to be "determining" receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, accessing (e.g., accessing data in a memory), etc.

[0276] Also, "determination" may be considered to be "deciding" resolving, selecting, choosing, establishing, comparing, etc. That is, "determination" may be considered to be "deciding" to perform some action.

[0277] Additionally, "judgment (decision)" may be interpreted as "assuming," "expecting," "considering," etc.

[0278] 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 two elements that are "connected" or "coupled" to each other. The coupling or connection between the elements may be physical, logical, or a combination thereof. For example, "connected" may be read as "access."

[0279] In this disclosure, when two elements are connected, they may be considered to be "connected" or "coupled" to one another using one or more wires, cables, printed electrical connections, and the like, as well as using electromagnetic energy having wavelengths in the radio frequency range, microwave range, light (both visible and invisible) range, and the like, as some non-limiting and non-exhaustive examples.

[0280] In the present disclosure, the term "A and B are different" may mean "A and B are different from each other." The term may also mean "A and B are each different from C." Terms such as "separate" and "coupled" may also be interpreted in the same way as "different."

[0281] When the terms "include," "including," and variations thereof are used in this disclosure, these terms are intended to be inclusive, similar to the term "comprising." Further, when used in this disclosure, the term "or" is not intended to be an exclusive or.

[0282] In this disclosure, where articles have been added by translation, such as a, an, and the in English, the disclosure may include that the nouns following these articles are in the plural form.

[0283] Although the invention according to the present disclosure has been described in detail above, it is clear to those skilled in the art that the invention according to the present disclosure is not limited to the embodiments described in the present disclosure. The invention according to the present disclosure can be implemented as modified and altered forms without departing from the spirit and scope of the invention defined based on the description of the claims. Therefore, the description of the present disclosure is intended to be illustrative and does not have any limiting meaning on the invention according to the present disclosure.

Claims

1. a control unit for controlling transmission of a capability information report indicating antenna switching capability for more than four receive antennas; A receiver that receives a configuration indicating one or more sounding reference signal (SRS) resource sets having the use of the antenna switching and depending on the capability information, and receives a medium access control-control element (MAC CE) that activates one SRS resource set 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 a maximum number of the one or more SRS resource sets; A terminal, wherein the maximum number is greater than the maximum number of SRS resource sets configured for another terminal that does not have the capability.

2. 2. The terminal of claim 1, wherein the capability information indicates at least one of: an antenna switching capability for one transmit antenna and six receive antennas; an antenna switching capability for two transmit antennas and six receive antennas; an antenna switching capability for four transmit antennas and six receive antennas; an antenna switching capability for one transmit antenna and eight receive antennas; an antenna switching capability for two transmit antennas and eight receive antennas; and an antenna switching capability for four transmit antennas and eight receive antennas.

3. controlling transmission of capability information reports indicative of antenna switching capability for more than four receive antennas; receiving a configuration indicating one or more Sounding Reference Signal (SRS) resource sets having a use for the antenna switching and dependent on the capability information; receiving a medium access control-control element (MAC CE) activating an SRS resource set of the one or more SRS resource sets; and controlling SRS transmission using the one SRS resource set based on the configuration and the MAC CE. The capability information indicates a maximum number of the one or more SRS resource sets; The wireless communication method for a terminal, wherein the maximum number is greater than the maximum number of SRS resource sets configured for another terminal that does not have the capability.

4. a control unit for controlling reception of capability information reports indicative of antenna switching capability for more than four receive antennas; A transmitter for transmitting a configuration depending on the capability information indicating one or more sounding reference signal (SRS) resource sets having the use of the antenna switching, and transmitting a medium access control-control element (MAC CE) for activating one SRS resource set of the one or more SRS resource sets, The control unit controls SRS reception based on the setting and the MAC CE; The capability information indicates a maximum number of the one or more SRS resource sets; A base station, wherein the maximum number is greater than the maximum number of SRS resource sets configured for another terminal that does not have the capability.

5. A system having a terminal and a base station, The terminal includes: a control unit for controlling transmission of a capability information report indicating antenna switching capability for more than four receive antennas; A receiver that receives a configuration indicating one or more sounding reference signal (SRS) resource sets having the use of the antenna switching and depending on the capability information, and receives a medium access control-control element (MAC CE) that activates one SRS resource set of the one or more SRS resource sets, The control unit controls transmission of the SRS using the one SRS resource set based on the setting and the MAC CE; The base station transmits the configuration and transmits the MAC CE; The capability information indicates a maximum number of the one or more SRS resource sets; The system, wherein the maximum number is greater than the maximum number of SRS resource sets configured for another terminal that does not have the capability.

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