CN115280869A

CN115280869A - Terminal, wireless communication method, and base station

Info

Publication number: CN115280869A
Application number: CN202080098391.9A
Authority: CN
Inventors: 冈村真哉; 松村祐辉; 永田聪
Original assignee: NTT Docomo Inc
Current assignee: NTT Docomo Inc
Priority date: 2020-03-19
Filing date: 2020-03-19
Publication date: 2022-11-01
Also published as: WO2021186727A1

Abstract

A terminal according to an aspect of the present disclosure includes: a control unit configured to determine a triggered SRS resource set among more than three aperiodic SRS resource sets, namely A-SRS resource sets, based on a combination of an SRS request field, which is a measurement reference signal request field, included in DCI, which is downlink control information, and other information; and a transmission unit configured to transmit an a-SRS based on the triggered SRS resource set. According to an aspect of the present disclosure, triggering of an a-SRS can be appropriately specified.

Description

Terminal, wireless communication method, and base station

Technical Field

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

Background

In a Universal Mobile Telecommunications System (UMTS) network, long Term Evolution (LTE) is standardized for the purpose of further high data rate, low latency, and the like (non-patent document 1). In addition, LTE-Advanced (3 GPP rel.10-14) is standardized for the purpose of further large capacity, advanced, and the like of LTE (Third Generation Partnership Project (3 GPP) version (Release 8, 9)).

Successor systems of LTE, such as also referred to as a fifth generation mobile communication system (5G), 5G + (plus), a sixth generation mobile communication system (6G), new Radio (NR), 3gpp rel.15 and so on, are also being studied.

Documents of the prior art

Non-patent document

Non-patent document 1:3GPP TS 36.300V8.12.0' Evolved Universal Radio Access (E-UTRA) and Evolved Universal Radio Access Network (E-UTRAN); (ii) an Overall description; stage 2 (Release 8) ", 4 months 2010

Disclosure of Invention

Problems to be solved by the invention

In NR, a Reference Signal for measurement (Sounding Reference Signal (SRS)) has various applications. The NR SRS is used not only for Uplink (UL) CSI measurement used in the conventional LTE (LTE rel.8-14), but also for Downlink (DL) CSI measurement, beam management (beam management), and the like.

In rel.15 and 16, an Aperiodic SRS (a-SRS) resource set that can be dynamically triggered by DCI is specified to be at most 3 throughout the usage of all SRS resource sets. In the future, it is preferable to be able to utilize a larger number of a-SRS resource sets.

There is an inflexible aspect of the utilization of the existing SRS resources using the downlink control information. If the SRS is not appropriately controlled, there is a concern that throughput may be reduced or communication quality may be degraded.

Accordingly, it is an object of the present disclosure to provide a terminal, a wireless communication method, and a base station capable of appropriately specifying triggering of a-SRS.

Means for solving the problems

A terminal according to an aspect of the present disclosure includes: a control unit configured to determine a triggered SRS resource set among more than three aperiodic SRS resource sets, namely A-SRS resource sets, based on a combination of an SRS request field, which is a measurement reference signal request field, included in DCI, which is downlink control information, and other information; and a transmission unit configured to transmit an a-SRS based on the triggered SRS resource set.

ADVANTAGEOUS EFFECTS OF INVENTION

According to an aspect of the present disclosure, triggering of an a-SRS can be appropriately specified.

Drawings

Fig. 1 is a diagram showing an example of SRI and SRS request field-based control of rel.15/16.

Fig. 2A and 2B are diagrams illustrating an example of the correspondence relationship between a field of DCI according to the first embodiment and a triggered a-SRS resource set.

Fig. 3A and 3B are diagrams illustrating another example of the correspondence relationship between a field of DCI and a triggered a-SRS resource set according to the first embodiment.

Fig. 4 is a diagram showing an example of the correspondence relationship between a field of DCI according to the modification of the first embodiment, a PDCCH resource for which DCI is detected, and a triggered a-SRS resource set.

Fig. 5A to 5D are diagrams illustrating an example of control of an a-SRS resource set using MAC CE according to the second embodiment.

Fig. 6A to 6C are diagrams showing an example of control of an a-SRS resource set using a MAC CE according to the second embodiment.

Fig. 7A to 7C are diagrams illustrating an example of control of an a-SRS resource set using a MAC CE according to the second embodiment.

Fig. 8A and 8B are diagrams illustrating an example of control of an a-SRS resource set using a MAC CE according to a modification of the second embodiment.

Fig. 9 is a diagram showing an example of a schematic configuration of a radio communication system according to an embodiment.

Fig. 10 is a diagram showing an example of the configuration of a base station according to an embodiment.

Fig. 11 is a diagram showing an example of the configuration of a user terminal according to an embodiment.

Fig. 12 is a diagram showing an example of hardware configurations of a base station and a user terminal according to an embodiment.

Detailed Description

(SRS)

In NR, a measurement Reference Signal (Sounding Reference Signal (SRS)) is used in various applications. The NR SRS is used not only for Uplink (UL) CSI measurement used in the conventional LTE (LTE rel.8-14) but also for Downlink (DL) CSI measurement, beam management (beam management), and the like.

The UE may also be configured (configure) with one or more SRS resources. The SRS Resource may also be determined by an SRS Resource Index (SRI).

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

The UE may also be set with one or more SRS resource sets (SRS resource sets). One set of SRS resources may also be associated with a particular number of SRS resources. The UE may commonly use higher layer parameters for SRS resources included in one SRS resource set. In addition, resource sets in the present disclosure may also be replaced with sets (collections), resource groups, and the like.

The information related to the SRS resource or resource set may also be set to the UE using higher layer signaling, physical layer signaling, or a combination thereof.

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

MAC signaling may use, for example, a MAC Control Element (MAC CE), a MAC Protocol Data Unit (PDU), and the like. The broadcast Information may be, for example, a Master Information Block (MIB), a System Information Block (SIB), minimum System Information (Remaining Minimum System Information (RMSI)), other System Information (OSI)), or the like.

The physical layer signaling may be, for example, downlink Control Information (DCI).

The SRS configuration information (e.g., "SRS-Config" of the RRC information element) may include SRS resource set configuration information, SRS resource configuration information, and the like.

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

Here, the SRS resource type may indicate any one of a Periodic SRS (P-SRS), a Semi-Persistent SRS (SP-SRS), and an Aperiodic SRS (a-SRS). In addition, the UE may periodically (or periodically after activation) transmit the P-SRS and the SP-SRS. The UE may also transmit an a-SRS based on the SRS request of the DCI.

The usage of SRS ("usage" of RRC parameter, "SRS-SetUse" of L1 (Layer-1) parameter) may be, for example, beam management, codebook (codebook), non-codebook (non-codebook), antenna switching, and the like. For example, SRS for codebook or non-codebook use may also be used for determination of precoders transmitted by a codebook-based or non-codebook-based Uplink Shared Channel (Physical Uplink Shared Channel (PUSCH)) based on SRI.

The SRS for beam management may be configured such that only one SRS resource can be transmitted at a specific time for each SRS resource set. In addition, when a plurality of SRS resources belong to different SRS resource sets, the SRS resources may be transmitted simultaneously.

The SRS Resource setting information (e.g., "SRS-Resource" of the RRC parameter) may include an SRS Resource ID (SRS-Resource ID), an SRS port number, a transmission Comb, SRS Resource mapping (e.g., time and/or frequency Resource position, resource offset, resource period, inverse number, SRS symbol number, SRS bandwidth, etc.), hopping association information, SRS Resource type, sequence ID, spatial relationship information, and the like.

The UE may switch (switching) the BWP (Bandwidth Part) of the SRS to be transmitted per slot, or may switch the antenna. Further, the UE may also apply at least one of intra-slot hopping and inter-slot hopping to SRS transmission.

(spatial relationship)

In NR, the UE may control transmission processing (for example, at least one of transmission, mapping, precoding, modulation, and coding) of at least one of an uplink channel and a signal (hereinafter, the term "a/B" may be similarly replaced with "at least one of a and B") based on a specific spatial relationship (spatial relationship).

The Spatial relationship applied to a specific channel/signal may also be determined by Spatial Relationship Information (SRI) notified (set) using higher layer signaling. The spatial relationship information of the SRS (for example, "spatial relationship info" of the RRC parameter) may also indicate spatial relationship information between a specific Reference Signal (RS) and the SRS.

The specific Reference Signal may be at least one of a Synchronization Signal Block (SSB), a Channel State Information-Reference Signal (CSI-RS), and a Sounding Reference Signal (SRS)). Here, the SSB may also be referred to as a Synchronization Signal/Physical Broadcast Channel (SS/PBCH) block.

The spatial relationship information of the SRS may include at least one of the SSB index, the CSI-RS resource ID, and the SRS resource ID as the index of the specific reference signal.

In addition, in the present disclosure, the SSB index, the SSB Resource ID, and the SSBRI (SSB Resource Indicator) may be replaced with each other. In addition, the CSI-RS index, the CSI-RS Resource ID, and the CRI (CSI-RS Resource Indicator) may be replaced with each other. In addition, the SRS index, SRS resource ID, and SRI may be replaced with each other.

The set SRI may include at least one of an SSB index, a CSI-RS resource ID, and an SRS resource ID as an index of the specific RS. The SRI may include a serving cell index corresponding to the specific RS, a Bandwidth Part (BWP) ID, and the like.

In addition, in the present disclosure, an index, an ID, an indicator, a resource ID, and the like may be substituted for each other.

When the spatial relationship information on the SSB or CSI-RS and the SRS is set for a certain SRS resource, the UE may transmit the SRS resource using the same spatial filter as that used for reception of the SSB or CSI-RS. That is, in this case, the UE may assume that the UE reception beam for the SSB or CSI-RS is the same as the UE transmission beam for the SRS.

When spatial relationship information on another SRS (reference SRS) and a certain SRS (target SRS) resource is set for the SRS resource, the UE may transmit the target SRS resource using the same spatial filter as that used for transmission of the reference SRS. That is, in this case, the UE may assume that the UE transmission beam for the reference SRS is the same as the UE transmission beam for the target SRS.

In addition, a spatial domain filter used for transmission of the base station, a downlink spatial domain transmission filter (downlink spatial domain transmission filter), and a transmission beam of the base station may be replaced with each other. The spatial domain filter for reception of the base station, the uplink spatial domain receive filter (uplink spatial domain receive filter), and the reception beam of the base station may be replaced with each other.

In addition, the spatial domain filter used for transmission of the UE, the uplink spatial domain transmission filter (uplink spatial domain transmission filter), and the transmission beam of the UE may be replaced with each other. The spatial domain filter used for reception of the UE, a downlink spatial domain reception filter (downlink spatial domain receive filter), and a reception beam of the UE may be replaced with each other.

In addition, the Spatial Relationship Information (SRI) may also correspond to a beam. For example, the UE may also assume that UL transmissions corresponding to different SRIs are transmitted using different beams.

A beam indication for an Uplink Control Channel (Physical Uplink Control Channel (PUCCH)) may be set by higher layer signaling. For example, when the PUCCH spatial relationship information includes one spatial relationship information (spatialrelalationinfo) parameter, the UE may apply the set parameter to the PUCCH. When the PUCCH spatial relationship information includes more than one spatial relationship information parameter, a parameter to be applied (activated) to the PUCCH may be determined based on the MAC CE.

The spatial relationship information of the PUCCH may be information obtained by replacing the SRS with the PUCCH in the above SRS spatial relationship information, and therefore, the description thereof will not be repeated.

The beam indication for PUSCH may be determined based on an SRI (SRS Resource Indicator) field included in DCI. The UE may transmit the PUSCH using the same transmission beam as the corresponding SRS among the SRSs set in the higher layer, based on the specified SRI. The beam indication for SRS may be the same.

For example, a UE to which PUSCH transmission by a codebook is set may determine (select) an SRS to be used in accordance with an SRS resource included in an SRS resource set of the codebook, based on the SRI field of the DCI.

The UE to which the non-codebook-based PUSCH transmission is set may determine (select) the SRS to be used in accordance with the SRS resource included in the non-codebook SRS resource set, based on the SRI field of the DCI.

The number of SRS resources included in an SRS resource set whose usage corresponds to a codebook may be different from the number of SRS resources included in an SRS resource set whose usage corresponds to a non-codebook, and may be, for example, 2 for the former and 4 for the latter. In this case, the SRI field size may be 1 bit for the former and 2 bits for the latter.

However, in rel.15 and 16, the a-SRS resource set that can be dynamically triggered by DCI is specified to be at most 3 for all uses of the SRS resource set. In the future, it is preferable to be able to utilize a larger number of a-SRS resource sets.

In rel.15 and 16, even when the beam (spatial relationship) of the PUSCH is not changed from the last transmission, the DCI needs to include the SRI field. Fig. 1 is a diagram showing an example of SRI and SRS request field-based control of rel.15/16.

In this example, the UE is scheduled to transmit PUSCH # i based on DCI # i (i = 0-4), respectively. When it is assumed that PUSCH transmission by a codebook is set for the UE, 1-bit SRI and a minimum SRS request field of 2 bits are included in each DCI.

In this example, the value of the SRI field of DCI #0 to 3, #5 =0, and the value of the SRI field of DCI #4 =1. In this case, PUSCHs #0 to # 3 and #5 are transmitted based on SRS resource #0, and PUSCH #4 is transmitted based on SRS resource # 1.

For PUSCHs #1, #2, the ue continues to use the same spatial relationship as PUSCH # 0. However, the DCI #1 and #2 need to include an SRI field.

The same applies even in the case where the SRI is 2 bits.

As described above, there is a problem that the use of the conventional SRS resource using the DCI is not flexible. If the SRS is not appropriately controlled, there is a concern that throughput may be reduced or communication quality may be degraded.

Therefore, the inventors of the present invention have conceived a method of appropriately setting (or specifying) the triggering of the a-SRS.

Hereinafter, embodiments according to the present disclosure will be described in detail with reference to the drawings. The radio communication methods according to the respective embodiments may be applied individually or in combination.

In addition, in the present disclosure, activation, deactivation, indication, selection, update, decision, and the like may be substituted for each other. Further, in the present disclosure, sequences, lists, sets (collections), groups, etc. may also be substituted for one another.

In the following embodiments, the UE may be set with more than one SRS resource set for the same purpose (for example, purpose = codebook, purpose = non-codebook, or the like).

In the present disclosure, the a-SRS resource trigger may also be referred to simply as a resource trigger. In addition, in the present disclosure, "(a-SRS) resource trigger = i SRS resource set" (i is an integer) may be replaced with at least one of the SRS resource set of i by the a-SRS resource trigger of the higher layer parameter (aperiodicSRS-resource trigger) and the SRS resource set of i by the entry of the a-SRS resource trigger list of the higher layer parameter (aperiodicSRS-resource trigger list).

In addition, in rel.15nr, the values that can be taken for the resource trigger are 1, 2, and 3, but in the present disclosure, the values that can be taken for the resource trigger are not limited to these.

(Wireless communication method)

< first embodiment >

The first embodiment relates to a scheme of using an SRS request field and an SRI field for a-SRS triggering.

When receiving DCI including an SRS request field and an SRI field, the UE may determine a triggered a-SRS resource set based on a combination of the fields. The bits represented by the combination of these fields may also be referred to as combined bits. In addition, such names of the combination bits are for convenience, and do not mean that the UE must interpret the bits in combination.

The DCI according to the first embodiment may correspond to a DCI format for scheduling a PUSCH, or may be DCI formats 0 _u0, 0 _u1, 0 _u2, or the like.

The UE may determine the triggered a-SRS resource set based on a combination of the fields when receiving DCI including the SRS request field and the SRI index indicated by the SRI field does not change (is the same value) from the latest SRI index (the last SRI index notified).

Fig. 2A and 2B are diagrams illustrating an example of the correspondence relationship between a field of DCI and a triggered a-SRS resource set according to the first embodiment. This example corresponds to the case where the size of the SRI field is 1 bit.

The triggered a-SRS resource set may also be specified by a combined bit of 3 bits in total with the SRI field (1 bit) being the most significant bit and the SRS request field (2 bits) being the least significant 2 bits. Of course, the order of the combination bits is not limited thereto.

The specific value of the bonding bit may also indicate that the a-SRS resource set is not triggered. For example, when the value of the SRS request field constituting the combination bit =0, it may indicate that the a-SRS resource set is not triggered. In addition, the UE can also assume that any value corresponding to a combination bit indicates a triggering of some kind of a-SRS resource set (does not indicate not being triggered).

In fig. 2A, a value =0 of the combination bit (corresponding to a value =00 of the SRS request field and a value =0 of the SRI field) may indicate that the a-SRS resource set is not triggered, and values =1 to 7 of the combination bit may indicate that one or more a-SRS resource sets corresponding to resource triggers 1 to 7 are triggered, respectively.

In fig. 2B, values =0 and 4 of the combination bit (corresponding to a value =00 of the SRS request field, respectively) may indicate that the a-SRS resource set is not triggered, and values =1-3 and 5-7 of the combination bit may indicate that one or more a-SRS resource sets corresponding to resource triggers 1-6 are triggered, respectively.

The UE may not perform PUSCH transmission associated with SRI when the a-SRS resource set is triggered (or indicated) by the SRS request field and the combination bit of the SRI field. In this case, when the beam of the PUSCH transmission is not changed as described above, the UE can perform control for transmitting more a-SRS while avoiding unnecessary PUSCH transmission.

The UE may not perform PUSCH transmission associated with the SRI when the a-SRS resource set is notified by a specific value of the combination bit. For example, with respect to the correspondence relationship of fig. 2A, a UE to which the value =0 of the combination bit is assigned may not perform PUSCH transmission by SRI = 0. With respect to the correspondence relationship of fig. 2B, the UE to which the value of the combination bit =0 or 4 is designated may not perform PUSCH transmission based on SRI =0 or 1, respectively.

Further, the UE may also perform PUSCH transmission associated with the SRI when the a-SRS resource set is triggered by the SRS request field and the combination bit of the SRI field.

Fig. 3A and 3B are diagrams illustrating another example of the correspondence relationship between a field of DCI and a triggered a-SRS resource set according to the first embodiment. This example corresponds to the case where the size of the SRI field is 2 bits.

The triggered a-SRS resource set may also be specified by a combined bit of 3 bits in total with the SRI field (2 bits) being the most significant bit and the SRS request field (2 bits) being the least significant 2 bits. Of course, the order of the combination bits is not limited thereto.

In fig. 3A, a value of the combination bit =0 (corresponding to a value of =00 in the SRS request field and a value of 00 in the SRI field) may indicate that the a-SRS resource set is not triggered, and values of the combination bit =1 to 15 may indicate that one or more a-SRS resource sets corresponding to resource triggers 1 to 15 are triggered, respectively.

In fig. 3B, values =0, 4, 8, and 12 of the combination bits (corresponding to the value =00 of the SRS request field, respectively) may indicate that the a-SRS resource set is not triggered, and values =1-3, 5-7, 9-11, and 13-15 of the combination bits may indicate that one or more a-SRS resource sets corresponding to the resource triggers 1-12 are triggered, respectively.

According to the first embodiment described above, for example, more than three a-SRS resource sets can be flexibly triggered by the SRI field.

< modification of the first embodiment >

In a variation of the first embodiment, the UE decides the triggered a-SRS resource set using at least one of the following instead of the SRI field of the first embodiment:

detects a PDCCH resource of DCI including the SRS request field,

any field contained in DCI containing an SRS request field.

The PDCCH Resource in which the DCI is detected may include at least one of a time Resource, a frequency Resource, a Control Channel Element (CCE) index, a Physical Resource Block (PRB) index, a Resource Element (RE) index, a search space index, a Control Resource Set (CORESET) index, an aggregation level, a cell index, a Component Carrier (CC) index, and an RB (Resource Block) index of the DCI (or a PDCCH corresponding to the DCI or used for reception).

In other words, the present disclosure supports an embodiment in which the SRI field of the first embodiment is replaced with at least one (PDCCH resource, arbitrary field) described above.

For example, when the UE receives DCI including the SRS request field and detects that the PDCCH resource of the DCI has not changed from the latest PDCCH resource (for example, the PDCCH resource in which the DCI was detected last) (for example, the PDCCH resource corresponds to the same CC index, here, the PDCCH resource may not be the same, and at least one of the elements of the PDCCH resource may be the same), the UE may determine the triggered a-SRS resource set based on the combination of the SRS request field and the PDCCH resource.

Fig. 4 is a diagram showing an example of the correspondence relationship between a field of DCI according to the modification of the first embodiment, a PDCCH resource for which DCI is detected, and a triggered a-SRS resource set. In this example, as a PDCCH resource, a CC index is used for triggering of an a-SRS resource set.

The triggered a-SRS resource set may also be specified by a combined bit of 3 bits in total, with a value (1 bit) derived based on the PDCCH CC index being the most significant bit and the SRS request field (2 bits) being the lower 2 bits. Of course, the order of the combination bits is not limited thereto.

In the example of fig. 4, regarding a value derived based on a CC index of a PDCCH, the value of the CC index is 0 if = odd, and 1 if = even. In addition, on the contrary, the value of the CC index may be 0 if it = even number, or 1 if it = odd number, or the like, or may be 0 if it belongs to the first group, or 1 if it belongs to the second group.

In fig. 4, values =0 and 4 of the combination bit (corresponding to a value =00 of the SRS request field, respectively) may indicate that the a-SRS resource set is not triggered, and values =1-3 and 5-7 of the combination bit may indicate that one or more a-SRS resource sets corresponding to resource triggers 1-6 are triggered, respectively.

The DCI according to the modification of the first embodiment may correspond to a DCI format for scheduling a PUSCH, a DCI format for scheduling a PDSCH, or DCI formats 1 \u0, 1 _u1, 1 _u2, or the like.

The combination bit in the first embodiment may be replaced with a bit of the SRS request field having 3 or more bits.

According to the modification of the first embodiment described above, even when the a-SRS is triggered using a DCI format (DCI format 1 \u1 or the like) that cannot utilize the SRI field, for example, more than three a-SRS resource sets can be flexibly triggered.

< second embodiment >

A second embodiment relates to the activation of A-SRS resource sets using MAC CEs.

In a second embodiment, the UE may also be set up to X sets of A-SRS resources, where X is more than 3. The X may be predefined by the specification or may be determined based on the UE capability (or the reported UE capability information). For example, X may be any of 8, 16, 32, 64, and the like.

The UE may also assume that up to Y a-SRS resource sets are activated in case more than three a-SRS resource sets are set. This Y may be predetermined by the specification, may be determined based on the UE capability (or the reported UE capability information), or may be set by higher layer signaling. For example, Y may be 3, or may be any value not more than X.

The UE may also envisage that more than one a-SRS resource set selected by DCI from the maximum of Y activated a-SRS resource sets is triggered. In the triggering of the a-SRS resource set, as in rel.15nr, a 2-bit SRS request field may be used, or a combination bit of 3 bits or more may be used as in the first embodiment.

[ SRS resource set ID activated by MAC CE Notification ]

Fig. 5A to 5D are diagrams showing an example of control of an a-SRS resource set using a MAC CE according to the second embodiment.

Fig. 5A to 5C are diagrams illustrating an example of a-SRS resource set activation/deactivation MAC CE. In these examples, a bit sequence constituting the MAC CE is shown. The MAC CE may also include information such as an a/D field indicating activation/deactivation, a Cell ID ("Serving Cell ID") field (of the SRS resource set) of an application object, and a BWP ID ("BWP ID" field) of the SRS resource set. The field of "R" may also mean reserved bits for future extensions. The same applies to other MAC CEs in the following figures, unless otherwise specified.

As shown in fig. 5A and 5B, the MAC CE may include an a-SRS resource set ID field indicating an activated a-SRS resource set ID. The size of each A-SRS resource set ID field may be based on X as described above, e.g., or may be log₂The (X) bits are expressed. Fig. 5A corresponds to X =16 (4 bits for the above field), and fig. 5B corresponds to X =64 (6 bits for the above field).

In the present disclosure, the a-SRS resource set ID may mean an SRS resource set ID (SRS-ResourceSetId) corresponding to an SRS resource set to which an RRC parameter resourceType indicating an a-SRS (aperiodic) is set.

As shown in fig. 5A and 5B, the MAC CE may include one or more a-SRS resource set ID fields. When the a/D field indicates '1' (active), the a-SRS resource set corresponding to each a-SRS resource set ID field included in the MAC CE may be activated. The same guidelines may also be applied for deactivation.

As shown in FIG. 5C, the MAC CE may also include "S_i"(i =0, 1, 2 \8230;). At a certain S_iIndicates 1, the UE activates the A-SRS resource set ID # i. At a certain S_iIn case that the field of (1) indicates 0, the UE deactivates the SRS resource list # i.

Fig. 5D is a diagram illustrating an example of correspondence relationship between DCI fields for specifying triggered a-SRS resource sets according to the second embodiment. In this example, the value of a certain field (SRS request field) included in the DCI and the corresponding a-SRS resource set are shown.

In fig. 5D, different sets of SRS resources are specified according to the value of the field. The UE may also assume that the SRS resource set # i activated by the MAC CE described above corresponds to the values of the fields in an ascending or descending order. That is, when the SRS resource set ID to be activated and the value of the field are arranged in ascending order or descending order, the SRS resource set ID and the value of the field may be associated one-to-one from the smaller one.

In addition, the A-SRS resource set ID field may also be replaced with an A-SRS resource trigger field that indicates the value of the A-SRS resource trigger. In this case, a set of a-SRS resources corresponding to the activated a-SRS resource trigger may also be triggered through DCI.

In this way, when the SRS resource set ID for activation is notified by the MAC CE, the SRS resource set for triggering can be flexibly controlled.

[ SRS use activated by MAC CE Notification ]

Fig. 6A is a diagram showing an example of activating/deactivating a-SRS use MAC CE. As shown in this example, the MAC CE may include an a-SRS usage (usage) field indicating an activated a-SRS usage. The size of this field may be based on the number of usages that can be set in the SRS resource set, and may be expressed by 2 bits when the number of usages is 4.

Fig. 6B is a diagram showing an example of the correspondence relationship between the value of the a-SRS use field and the use to be activated. In this example, a value of =00 indicates usage = beam management (corresponding to the RRC parameter usage = "beamManagement"), a value of =01 indicates usage = codebook (corresponding to the RRC parameter usage = "codebook"), a value of =10 indicates usage = non-codebook (corresponding to the RRC parameter usage = "non-codebook"), and a value of =11 indicates usage = antenna switching (corresponding to the RRC parameter usage = "antenna switching").

In addition, the correspondence relationship is not limited thereto. For example, a value =00 may indicate usage = beam management, a value =01 may indicate usage = codebook or non-codebook, a value =10 may indicate usage = antenna switching, and a value =11 may indicate future usage.

Fig. 6C is a diagram illustrating an example of the correspondence relationship of DCI fields for specifying a triggered a-SRS resource set according to the second embodiment. In this example, the value of the a-SRS usage field of the MAC CE, the value of a certain field (SRS request field) included in DCI, and the corresponding a-SRS resource set are shown.

In this example, SRS request fields =01, 10, and 11 indicate a-SRS resource trigger =1, 2, and 3, respectively, and trigger SRS resource sets of specific uses. The specific use is a use that is activated by the a-SRS use field.

In addition, the MAC CE of fig. 6A may also include a plurality of a-SRS usage fields. Multiple a-SRS uses may also be activated using one or more of the MAC CEs described above. The UE may also trigger multiple SRS resource sets based on one DCI for multiple activated a-SRS usages.

For example, if a UE whose beam management and codebook use are activated by the MAC CE is designated with the SRS request field =01 of DCI, the UE may trigger an SRS resource set whose a-SRS resource trigger =1 and whose beam management use =1 and an SRS resource set whose a-SRS resource trigger =1 and whose codebook use =.

In addition, in fig. 6C, the triggered SRS resource set is assumed to be an a-SRS resource trigger (aperiodic SRS-resource trigger) or an a-SRS resource trigger list (aperiodic SRS-resource trigger list) also used in rel.15nr, but is not limited thereto. For example, the resource trigger or the resource trigger list may be set as different parameters for each use of the a-SRS.

Usage = resource trigger (or list) of beam management may also be set by RRC parameter aperiodicSRS-resource triggerofbeammanagement (or aperiodicSRS-resource triggerlistofbeammanagement).

Usage = resource trigger (or list) of codebook may also be set by RRC parameter aperiodicSRS-resource triggerofcodebook (or aperiodicSRS-resource triggerlistofcodebook).

Usage = resource trigger (or list) of non-codebooks may also be set by the RRC parameter aperiod srs-resource triggeroffnocodebook (or aperiod srs-resource triggerlistofnocodebook).

Usage = resource triggering (or list) of antenna switching may also be set by the RRC parameter aperiodicSRS-resource triggerofantenna switching (or aperiodicSRS-resource triggerlistofantenna switching).

The "SRS resource set of a-SRS resource trigger = i and usage = XXX" of fig. 6C may also be replaced with "SRS resource set of usage = XXX whose resource trigger (or entry of list) = 1".

In this way, when the MAC CE notifies the SRS usage to be activated, the SRS resource set to be triggered can be flexibly controlled using the MAC CE with relatively small overhead.

[ A-SRS resource set group activated by MAC CE Notification ]

Fig. 7A is a diagram showing an example of a-SRS resource set group activation/deactivation MAC CE. As shown in this example, the MAC CE may include an a-SRS resource set group ID field indicating an activated a-SRS resource set group.

A-SRS resource set group may also mean a group associated with more than one A-SRS resource set. In addition, a group may also contain one or more sets of A-SRS resources for one or more purposes.

The UE may also be set to a-SRS resource set groups up to Z. The Z may be predetermined by a specification, may be determined based on the UE capability (or the reported UE capability information), or may be set by higher layer signaling. This Z may be any of 1, 2, 4, 8, 16, 32, and the like, for example.

The size of the A-SRS resource set group ID field may be based on Z as described above, e.g., or log₂The (Z) bit is expressed. Fig. 7A corresponds to Z =4 (the above field is 2 bits).

Fig. 7B is a diagram showing an example of the correspondence relationship between the value of the a-SRS resource set group ID field and the activated group. In this example, a value =00 indicates group 1 (G1), a value =01 indicates group 2 (G2), a value =10 indicates group 3 (G3), and a value =11 indicates group 4 (G4). In addition, the correspondence relationship is not limited thereto.

Fig. 7C is a diagram illustrating an example of the correspondence relationship of DCI fields for specifying a triggered a-SRS resource set according to the second embodiment. In this example, the value of the a-SRS resource set group ID field of the MAC CE, the value of a certain field (SRS request field) included in DCI, and the corresponding a-SRS resource set are shown.

In this example, the SRS resource set group ID fields =01, 10, 11 indicate a-SRS resource trigger =1, 2, 3, respectively, and the triggering of SRS resource sets belonging to (associated with) a specific group. The specific group is a group activated through an a-SRS resource set group ID field.

In addition, the MAC CE of fig. 7A may include a plurality of a-SRS resource set group ID fields. Multiple a-SRS resource set groups may also be activated using one or more of the MAC CEs described above. For the activated multiple groups, the UE may also trigger multiple SRS resource sets based on one DCI.

For example, when the UE whose MAC CE activates G1 and G2 is assigned the SRS request field =01 of DCI, the UE may trigger an SRS resource set of G1 with a-SRS resource trigger =1 and an SRS resource set of G2 with a-SRS resource trigger =1.

In addition, in fig. 7C, the set of SRS resources to be triggered is assumed to be an a-SRS resource trigger (aperiodic SRS-resource trigger) or an a-SRS resource trigger list (aperiodic SRS-resource trigger list) that is also used in rel.15nr. In this case, the SRS resource set may be set including RRC parameters related to the group. However, it is not limited thereto. For example, the resource trigger or the resource trigger list may be set as a different parameter for each a-SRS resource set group.

The resource trigger (or list) for group k may also be set via the RRC parameter groupBasedAperiodiciSRS-ResourceTriggerGroupk (or groupBasedAperiodicisSRS-ResourceTriggerListGroupk).

The "SRS resource set belonging to Gk and the a-SRS resource trigger = i" of fig. 7C may also be replaced with "SRS resource set of use = XXX and the resource trigger (or entry of the list) = 1".

In this way, when an a-SRS resource set group to be activated is notified by a MAC CE, the activation of SRS resource sets associated with one or more usages can be controlled using the MAC CE with relatively small overhead.

< modification of the second embodiment >

As shown in fig. 5A, 5B, 5C, 6A, and 7A, the MAC CE described in the second embodiment may be a MAC CE used only for controlling the a-SRS resource set, or may also be used as a MAC CE used for other control. For example, at least one of the above-described a-SRS resource set ID field, a-SRS usage field, and a-SRS resource set group ID field may be notified by being included in another MAC CE.

Fig. 8A is a diagram showing an example of a MAC CE in which a part of a conventional SP SRS Activation/Deactivation MAC CE (SP SRS Activation/Deactivation MAC CE) is modified.

The MAC CE may also include information indicating whether to activate or deactivate ("a/D" field), a cell ID for identifying a cell including an SRS resource set of an activation target, a Bandwidth Part (BWP) ID corresponding to a UL BWP of the SRS resource set including the activation target, an SP SRS resource set ID of the activation target, an activation target carrier ("SUL" field), a reference signal resource ID corresponding to a spatial relationship of SRS resources, and the like.

Reference signal Resource ID and "Resource ID" for the ith SRS Resource in a set of SRS resources_i"correspond to" each other. The reference signal resource ID may be at least one of a non-zero power CSI-RS resource index, an SSB index, an SRS resource ID, a CORESET ID, and the like. The MAC CE may include a serving cell ID, a BWP ID, and the like corresponding to the reference signal resource ID (whether or not these are included may be indicated by the "C" field).

F_iCan also be used to identify "Resource ID_i"corresponds to which reference signal (e.g., CSI-RS, SSB, SRS (P-SRS, SP-SRS, A-SRS), CORESET). About "Resource ID_i"which reference signal corresponds to" may also be based on F_iAnd "Resource ID_i"characteristics of itselfA certain bit combination is determined. In FIG. 8A, F_iIs expressed by 1 bit, but is not limited thereto.

In fig. 8A, the left 2-bit reserved field of the "C" field of the conventional SP SRS activation/deactivation MAC CE is replaced with the above-mentioned a-SRS resource set group ID field. The UE may also activate the SP SRS resource set indicated by the SP SRS resource set ID field and activate the a-SRS resource set group indicated by the a-SRS resource set group ID field based on the MAC CE.

Fig. 8B shows a modification of fig. 8A. F with respect to FIG. 8A₀Since the subsequent fields are used for specification of the spatial relationship of the SP SRS, they may not be included when the spatial relationship of the SP SRS does not need to be updated, for example, when the a/D field indicates deactivation (0).

Even in the case where the a/D field indicates deactivation, the UE can activate an a-SRS resource set group based on the a-SRS resource set group ID field of fig. 8B. In this case, the SP SRS resource set and the a-SRS resource set can be controlled simultaneously using the compact MAC CE as shown in fig. 8B.

The a-SRS resource set group ID field in fig. 8A and 8B may be replaced with an a-SRS resource set ID field, an a-SRS usage field, and the like.

< other >

In addition, the UE may also be conceived to operate in compliance with any of the embodiments described above, if at least one of the following conditions is satisfied:

(condition a) is set to a certain RRC signaling;

(condition B) is activated by a certain MAC CE;

(condition C) is set to more than a certain number (e.g., 3) of a-SRS resource sets;

(condition D) more than a certain number (e.g., 3) of a-SRS resource sets are activated;

(condition E) more than a certain number (e.g., 3) of a-SRS resource sets are supported (or UE capability information indicating the supported case is reported).

The RRC signaling of condition a may be an RRC parameter indicating "more than three a-SRS resource sets", an RRC parameter indicating "extended (extended) a-SRS", an RRC parameter indicating "flexible a-SRS", or an RRC parameter indicating "rel.xx (e.g., XX = 17) a-SRS". Here, the "RRC parameter indicating \8230; may be replaced with the" RRC parameter indicating 8230, activation (enable) "or the" RRC parameter indicating operation for \8230.

With the MAC CE of condition B, the UE may be activated for both "more than three a-SRS resource sets" and "extended a-SRS", as well as "flexible a-SRS" and "rel.xx (e.g., XX = 17) a-SRS".

The A-SRS resource set of conditions C-E may also be replaced with an A-SRS resource trigger, an A-SRS resource trigger list, an entry of an A-SRS resource trigger list, etc.

(Wireless communication System)

Hereinafter, a configuration of a radio communication system according to an embodiment of the present disclosure will be described. In this radio communication system, communication is performed using any one of the radio communication methods according to the above embodiments of the present disclosure or a combination thereof.

Fig. 9 is a diagram showing an example of a schematic configuration of a radio communication system according to an embodiment. The wireless communication system 1 may be a system that realizes communication by Long Term Evolution (LTE) standardized by the Third Generation Partnership Project (3 GPP), a New wireless (5 th Generation mobile communication system New Radio (5G NR)), and the like.

In addition, the wireless communication system 1 may also support Dual Connectivity (Multi-RAT Dual Connectivity (MR-DC)) between a plurality of Radio Access Technologies (RATs). The MR-DC may include Dual connection of LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (EN-DC))), dual connection of NR and LTE (NR-E-UTRA Dual Connectivity (NE-DC))), and the like.

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

The wireless communication system 1 may also support Dual connection between a plurality of base stations within the same RAT (for example, dual connection of a base station (gNB) in which both MN and SN are NR (NR-NR Dual Connectivity (NN-DC)))).

The radio communication system 1 may include a base station 11 forming a macrocell C1 having a relatively wide coverage area, and base stations 12 (12 a to 12C) arranged within the macrocell C1 and forming a small cell C2 narrower than the macrocell C1. The user terminal 20 may also be located in at least one cell. The arrangement, number, and the like of each cell and user terminals 20 are not limited to the illustrated embodiments. Hereinafter, the base stations 11 and 12 are collectively referred to as the base station 10 without distinguishing them.

The user terminal 20 may also be connected to at least one of the plurality of base stations 10. The user terminal 20 may use at least one of Carrier Aggregation (CA) and Dual Connectivity (DC) using a plurality of Component Carriers (CCs)).

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

The user terminal 20 may perform communication using at least one of Time Division Duplex (TDD) and Frequency Division Duplex (FDD) in each CC.

The plurality of base stations 10 may also be connected by wire (e.g., optical fiber based Common Public Radio Interface (CPRI), X2 Interface, etc.) or wireless (e.g., NR communication). For example, when NR communication is used as a Backhaul between base stations 11 and 12, base station 11 corresponding to an upper station may be referred to as an Integrated Access Backhaul (IAB) donor (donor) and base station 12 corresponding to a relay (relay) may be referred to as an IAB node.

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

The user terminal 20 may be a terminal supporting at least one of communication schemes such as LTE, LTE-a, and 5G.

The radio communication system 1 may use a radio access scheme based on Orthogonal Frequency Division Multiplexing (OFDM). 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), or the like may be used.

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

As the Downlink Channel, a Downlink Shared Channel (Physical Downlink Shared Channel (PDSCH)) Shared by the user terminals 20, a Broadcast Channel (Physical Broadcast Channel (PBCH))), a Downlink Control Channel (Physical Downlink Control Channel (PDCCH)), and the like may be used in the radio communication system 1.

As the Uplink Channel, an Uplink Shared Channel (Physical Uplink Shared Channel (PUSCH)), an Uplink Control Channel (Physical Uplink Control Channel (PUCCH)), a Random Access Channel (Physical Random Access Channel (PRACH)), or the like, which is Shared by each user terminal 20, may be used in the radio communication system 1.

User data, higher layer control Information, a System Information Block (SIB), and the like are transmitted through the PDSCH. User data, higher layer control information, etc. may also be transmitted through the PUSCH. In addition, a Master Information Block (MIB) may also be transmitted through the PBCH.

The lower layer control information may also be transmitted through 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.

The DCI scheduling PDSCH may be referred to as DL assignment, DL DCI, or the like, and the DCI scheduling PUSCH may be referred to as UL grant, UL DCI, or the like. In addition, PDSCH may be replaced with DL data, and PUSCH may be replaced with UL data.

For PDCCH detection, a COntrol REsource SET (countrol REsource SET (CORESET)) and a search space (search space) may be used. CORESET corresponds to searching for DCI resources. The search space corresponds to a search region and a search method of PDCCH candidates (PDCCH candidates). A CORESET may also be associated with one or more search spaces. The UE may also monitor the CORESET associated with a certain search space based on the search space settings.

One search space may correspond to PDCCH candidates corresponding to one or more aggregation levels (aggregation levels). The one or more search spaces may also be referred to as a set of search spaces. In addition, "search space", "search space set", "search space setting", "search space set setting", "CORESET setting", and the like of the present disclosure may be replaced with each other.

Uplink Control Information (UCI)) including at least one of Channel State Information (CSI), ACKnowledgement Information (which may also be referred to as Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK)), ACK/NACK, and Scheduling ReQuest (SR)) may also be transmitted through the PUCCH. The random access preamble for establishing a connection with a cell may also be transmitted through the PRACH.

In addition, in the present disclosure, a downlink, an uplink, and the like may also be expressed without "link". Note that the beginning of each channel may be expressed without "Physical (Physical)" being included.

In the wireless communication system 1, a Synchronization Signal (SS), a Downlink Reference Signal (DL-RS), and the like may be transmitted. The DL-RS may be 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), or the like, which is transmitted through the wireless communication system 1.

The Synchronization Signal may be at least one of a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS), for example. The signal blocks containing the SS (PSS, SSs) and PBCH (and DMRS for PBCH) may also be referred to as SS/PBCH blocks, SS blocks (SSB), and the like. In addition, SS, SSB, etc. may also be referred to as reference signals.

In addition, in the wireless communication system 1, as an Uplink Reference Signal (UL-RS), a measurement Reference Signal (Sounding Reference Signal (SRS)), a demodulation Reference Signal (DMRS), or the like may be transmitted. In addition, the DMRS may also be referred to as a user terminal specific Reference Signal (UE-specific Reference Signal).

(base station)

Fig. 10 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 transmitting/receiving unit 120, a transmitting/receiving antenna 130, and a transmission line interface (transmission line interface) 140. The control unit 110, the transmission/reception unit 120, the transmission/reception antenna 130, and the transmission line interface 140 may be provided in one or more numbers.

In this example, the functional blocks of the characteristic portions in the present embodiment are mainly shown, but it is also conceivable that the base station 10 has other functional blocks necessary for wireless communication. A part of the processing of each unit described below may be omitted.

The control unit 110 performs overall control of the base station 10. The control unit 110 can be configured by a controller, a control circuit, and the like described based on common knowledge in the technical field of the present disclosure.

The control unit 110 may also control generation of signals, scheduling (e.g., resource allocation, mapping), and the like. The control unit 110 may control transmission and reception, measurement, and the like using the transmission and reception unit 120, the transmission and reception antenna 130, and the transmission path interface 140. Control section 110 may generate data, control information, sequence (sequence), and the like to be transmitted as a signal, and forward the generated data, control information, sequence, and the like to transmission/reception section 120. The control unit 110 may perform call processing (setting, release, and the like) of a communication channel, state management of the base station 10, management of radio resources, and the like.

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

The transmission/reception unit 120 may be configured as an integrated transmission/reception unit, or may be configured by a transmission unit and a reception unit. The transmission unit may be constituted by the transmission processing unit 1211 and the RF unit 122. The receiving unit may be configured by the reception processing unit 1212, the RF unit 122, and the measurement unit 123.

The transmitting/receiving antenna 130 can be configured by an antenna described based on common recognition in the technical field of the present disclosure, for example, an array antenna.

The transmitting/receiving unit 120 may transmit the above-described downlink channel, synchronization signal, downlink reference signal, and the like. The transmission/reception unit 120 may receive the uplink channel, the uplink reference signal, and the like.

Transmit/receive section 120 may form at least one of a transmit beam and a receive beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), and the like.

For example, with respect to Data, control information, and the like acquired from Control section 110, transmission/reception section 120 (transmission processing section 1211) may perform processing of a Packet Data Convergence Protocol (PDCP) layer, processing of a Radio Link Control (RLC) layer (e.g., RLC retransmission Control), processing of a Medium Access Control (MAC) layer (e.g., HARQ retransmission Control), and the like, and generate a bit string to be transmitted.

Transmission/reception section 120 (transmission processing section 1211) may perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filter processing (filtering), discrete Fourier Transform (DFT) processing (if necessary), inverse Fast Fourier Transform (IFFT) processing, precoding, and digital-analog conversion on a bit sequence to be transmitted, and output a baseband signal.

The transmission/reception section 120 (RF section 122) may perform modulation, filter processing, amplification, and the like on the baseband signal in the radio frequency band, and transmit the signal in the radio frequency band via the transmission/reception antenna 130.

On the other hand, the transmission/reception section 120 (RF section 122) may amplify, filter, demodulate a signal in a radio frequency band received by the transmission/reception antenna 130 to a baseband signal.

Transmission/reception section 120 (reception processing section 1212) may apply reception processing such as analog-to-digital conversion, fast Fourier Transform (FFT) processing, inverse Discrete Fourier Transform (IDFT) processing (if necessary), filter processing, demapping, demodulation, decoding (including error correction decoding, as well as MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal, and acquire user data.

The transmission/reception unit 120 (measurement unit 123) may also perform measurement related to the received signal. For example, measurement section 123 may perform Radio Resource Management (RRM) measurement, channel State Information (CSI) measurement, and the like based on the received signal. Measurement section 123 may perform measurement of 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 Indicator (e.g., received Signal Strength Indicator (RSSI)), propagation path information (e.g., CSI), and the like. The measurement result may also be output to the control unit 110.

The channel interface 140 may transmit and receive signals (backhaul signaling) to and from devices included in the core network 30, other base stations 10, and the like, or may acquire and transmit user data (user plane data) and control plane data and the like for the user terminal 20.

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

Furthermore, control section 110 may control a triggered SRS resource set among more than three aperiodic SRS resource sets, i.e., a-SRS resource sets, based on a combination of an SRS request field, which is a measurement reference signal request field included in DCI, which is downlink control information, and other information. Transmission/reception section 120 may also transmit the DCI.

Furthermore, transmission/reception section 120 may transmit a MAC control element, which is a medium access control element, related to activation of an a-SRS resource set, which is an aperiodic-measurement reference signal resource set. Control section 110 may control the triggered SRS resource set among the SRS resource sets activated by the MAC control element based on the SRS request field included in the DCI serving as the downlink control information.

(user terminal)

Fig. 11 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 transmission/reception unit 220, and a transmission/reception antenna 230. Further, the control unit 210, the transmission/reception unit 220, and the transmission/reception antenna 230 may be provided with one or more antennas.

In this example, the functional blocks of the characteristic parts in the present embodiment are mainly shown, but it is also conceivable that the user terminal 20 further has other functional blocks necessary for wireless communication. A part of the processing of each unit described below may be omitted.

The control unit 210 performs overall control of the user terminal 20. The control unit 210 can be configured by a controller, a control circuit, and the like described based on common knowledge in the technical field related to the present disclosure.

The control unit 210 may also control the generation, mapping, etc. of the signals. Control section 210 may control transmission/reception, measurement, and the like using transmission/reception section 220 and transmission/reception antenna 230. Control section 210 may generate data, control information, a sequence, and the like to be transmitted as a signal, and forward the generated data, control information, sequence, and the like to transmission/reception section 220.

The transmitting/receiving unit 220 may include a baseband unit 221, an RF unit 222, and a measurement unit 223. The baseband section 221 may include a transmission processing section 2211 and a reception processing section 2212. The transmitting/receiving section 220 can be configured by 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 knowledge in the technical field of the present disclosure.

The transmission/reception unit 220 may be configured as an integrated transmission/reception unit, or may be configured by a transmission unit and a reception unit. The transmission section may be constituted by the transmission processing section 2211 and the RF section 222. The receiving unit may be composed of a reception processing unit 2212, an RF unit 222, and a measuring unit 223.

The transmission/reception antenna 230 can be configured by an antenna described based on common knowledge in the technical field of the present disclosure, for example, an array antenna.

The transmitting/receiving unit 220 may receive the above-described downlink channel, synchronization signal, downlink reference signal, and the like. The transmission/reception unit 220 may transmit the uplink channel, the uplink reference signal, and the like described above.

Transmit/receive section 220 may form at least one of a transmit beam and a receive beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), and the like.

For example, transmission/reception section 220 (transmission processing section 2211) may perform processing in the PDCP layer, processing in the RLC layer (for example, RLC retransmission control), processing in the MAC layer (for example, HARQ retransmission control), and the like on data, control information, and the like acquired from control section 210, and generate a bit sequence to be transmitted.

Transmission/reception section 220 (transmission processing section 2211) may perform transmission processing such as channel coding (including error correction coding as well), modulation, mapping, filter processing, DFT processing (if necessary), IFFT processing, precoding, and digital-to-analog conversion on a bit sequence to be transmitted, and output a baseband signal.

Whether or not DFT processing is applied may be set based on transform precoding. For a certain channel (e.g., PUSCH), when transform precoding is active (enabled), transmission/reception section 220 (transmission processing section 2211) may perform DFT processing as the transmission processing in order to transmit the channel using a DFT-s-OFDM waveform, or otherwise, transmission/reception section 220 (transmission processing section 2211) may not perform DFT processing as the transmission processing.

The transmission/reception unit 220 (RF unit 222) may perform modulation, filtering, amplification, and the like on a baseband signal in a radio frequency band, and transmit a signal in the radio frequency band via the transmission/reception antenna 230.

On the other hand, the transmission/reception section 220 (RF section 222) may perform amplification, filter processing, demodulation to a baseband signal, and the like on a signal in a radio frequency band received by the transmission/reception antenna 230.

Transmission/reception section 220 (reception processing section 2212) may apply reception processing such as analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filter processing, demapping, demodulation, decoding (including error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal, and acquire user data.

The transceiver unit 220 (measurement unit 223) may also perform measurements related to the received signal. For example, the measurement unit 223 may also perform RRM measurement, CSI measurement, and the like based on the received signal. Measurement unit 223 may also measure for received power (e.g., RSRP), received quality (e.g., RSRQ, SINR, SNR), signal strength (e.g., RSSI), propagation path information (e.g., CSI), and the like. The measurement result may also be output to the control unit 210.

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

Furthermore, control section 210 may determine a triggered SRS resource set among more than three a-SRS resource sets, which are aperiodic SRS resource sets, based on a combination of an SRS request field, which is a measurement reference signal request field included in DCI, which is downlink control information, and other information. Transmission/reception section 220 may also transmit an a-SRS based on the triggered SRS resource set.

The other information may be an SRI field, which is an SRS resource indicator field included in the DCI.

When transmitting the a-SRS based on the triggered SRS resource set, transmission/reception section 220 may not transmit the PUSCH which is the uplink shared channel based on the SRI field.

The other information may be a resource of a PDCCH, which is a downlink control channel in which the DCI is detected.

Furthermore, transmission/reception section 220 may receive a MAC control element, which is a medium access control element, related to activation of an a-SRS resource set, which is an aperiodic measurement reference signal resource set. Control section 210 may determine a triggered SRS resource set among the SRS resource sets activated by the MAC control element based on an SRS request field that is a measurement reference signal request field included in DCI that is downlink control information. Transmission/reception section 220 may also transmit an a-SRS based on the triggered SRS resource set.

The MAC control element may also include an a-SRS resource set ID field indicating an activated a-SRS resource set Identifier (ID)).

The MAC control element may also include an a-SRS usage field indicating the a-SRS usage for activation.

The MAC control element may also include an a-SRS resource set group ID field indicating an activated a-SRS resource set group Identifier (ID)).

(hardware construction)

The block diagram used in the description of the above embodiment shows blocks in functional units. These functional blocks (structural units) are implemented by any combination of at least one of hardware and software. The method of implementing each functional block is not particularly limited. That is, each functional block may be implemented by one apparatus that is physically or logically combined, or may be implemented by a plurality of apparatuses that are directly or indirectly (for example, by wire or wireless) connected to two or more apparatuses that are physically or logically separated. The functional blocks may also be implemented by combining the above-described device or devices with software.

Here, the functions include, but are not limited to, judgment, determination, judgment, calculation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, solution, selection, establishment, comparison, assumption, expectation, view, broadcast (broadcasting), notification (notification), communication (communication), forwarding (forwarding), configuration (setting), reconfiguration (resetting), allocation (allocating, mapping), assignment (ordering), and the like. For example, a function block (a configuration unit) that realizes a transmission function may also be referred to as a transmission unit (transmitting unit), a transmitter (transmitter), or the like. As described above, the method of realizing any of the above methods is not particularly limited.

For example, the base station, the user terminal, and the like in one embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure. Fig. 12 is a diagram showing an example of hardware configurations of a base station and a user terminal according to an embodiment. The base station 10 and the 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, and the like.

In addition, in the present disclosure, terms of devices, circuits, apparatuses, sections (sections), units, and the like can be substituted for one another. The hardware configuration of the base station 10 and the user terminal 20 may include one or more of the devices shown in the drawings, or may not include some of the devices.

For example, only one processor 1001 is illustrated, but there may be multiple processors. The processing may be executed by one processor, or may be executed by two or more processors simultaneously, sequentially, or by another method. Further, the processor 1001 may be implemented by one or more chips.

Each function of the base station 10 and the user terminal 20 is realized by, for example, reading specific software (program) into hardware such as the processor 1001 and the memory 1002, performing an operation by the processor 1001 to control communication via the communication device 1004, or controlling at least one of reading and writing of data in the memory 1002 and the storage 1003.

The processor 1001 controls the entire computer by operating an operating system, for example. The processor 1001 may be configured by a Central Processing Unit (CPU) including an interface with peripheral devices, a control device, an arithmetic device, a register, and the like. For example, at least a part of the control unit 110 (210), the transmission/reception unit 120 (220), and the like may be implemented by the processor 1001.

The processor 1001 reads out a program (program code), a software module, data, and the like from at least one of the storage 1003 and the communication device 1004 to the memory 1002, and executes various processes in accordance with these. As the program, a program that causes a computer to execute at least a part of the operations described in the above-described embodiments may be 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 may be similarly realized for other functional blocks.

The Memory 1002 may be a computer-readable recording medium, and may be formed of at least one of a Read Only Memory (ROM), an Erasable Programmable ROM (EPROM), an Electrically Erasable Programmable ROM (EEPROM), a Random Access Memory (RAM), or other suitable storage medium. The memory 1002 may also be referred to as a register, cache, main memory (primary storage), etc. The memory 1002 can store a program (program code), a software module, and the like that are executable to implement the wireless communication method according to the embodiment of the present disclosure.

The storage 1003 may be a computer-readable recording medium, and may be configured with at least one of a flexible disk (flexible Disc), a Floppy (registered trademark) disk, an optical disk (e.g., a Compact Disc read only memory (CD-ROM)) or the like), a digital versatile Disc (dvd), a Blu-ray (registered trademark) disk), a removable disk (removable Disc), a hard disk drive, a smart card, a flash memory device (e.g., a card, a stick, a key drive), a magnetic stripe (stripe), a database, a server, or other suitable storage media. The storage 1003 may also be referred to as a secondary storage device.

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 referred to as a network device, a network controller, a network card, a communication module, or the like. Communication apparatus 1004 may be configured to include a high-Frequency switch, a duplexer, a filter, a Frequency synthesizer, and the like, in order to realize at least one of Frequency Division Duplex (FDD) and Time Division Duplex (TDD), for example. For example, the above-described transmission/reception section 120 (220), transmission/reception antenna 130 (230), and the like may be implemented by the communication device 1004. The transmitting/receiving unit 120 (220) may be implemented by physically or logically separating the transmitting unit 120a (220 a) and the receiving unit 120b (220 b).

The input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, and the like) that receives an input from the outside. The output device 1006 is an output device (for example, a display, a speaker, a Light Emitting Diode (LED) lamp, or the like) that outputs to the outside. The input device 1005 and the output device 1006 may be integrated (for example, a touch panel).

Further, the processor 1001, the memory 1002, and other devices are connected by a bus 1007 for communicating information. The bus 1007 may be formed by a single (single) bus, or may be formed by different buses between the respective devices.

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), and a Field Programmable Gate Array (FPGA), and a part or all of the functional blocks may be implemented by the hardware. For example, the processor 1001 may also be implemented using at least one of these hardware.

(modification example)

In addition, terms described in the present disclosure and terms required for understanding the present disclosure may be replaced with terms having the same or similar meanings. For example, channels, symbols, and signals (signals or signaling) may be substituted for one another. Further, the signal may also be a message. The Reference Signal (Reference Signal) may also be referred to as RS for short, and may also be referred to as Pilot (Pilot), pilot Signal, etc. depending on the applied standard. Further, component Carriers (CCs) may also be referred to as cells, frequency carriers, carrier frequencies, and the like.

A radio frame may also be made up of one or more periods (frames) in the time domain. Each of the one or more periods (frames) that make up a radio frame may also be referred to as a subframe. Further, a subframe may also be composed of one or more slots in the time domain. The subframe may also be a fixed time length (e.g., 1 ms) independent of a parameter set (numerology).

Here, the parameter set may also refer to a communication parameter applied in at least one of transmission and reception of a certain signal or channel. For example, the parameter set may further indicate at least one of SubCarrier Spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission Time Interval (TTI), the number of symbols per TTI, radio frame structure, specific filtering processing performed by the transceiver in the frequency domain, specific windowing processing performed by the transceiver in the Time domain, and the like.

The slot may also be formed of one or more symbols in the time domain (Orthogonal Frequency Division Multiplexing (OFDM)) symbols, single Carrier Frequency Division Multiple Access (SC-FDMA) symbols, and the like). Further, the time slot may also be a time unit based on a parameter set.

A timeslot may also contain multiple mini-slots. Each mini-slot may also be made up of one or more symbols in the time domain. In addition, a mini-slot may also be referred to as a sub-slot. A mini-slot may also be made up of a fewer number of symbols than a slot. The PDSCH (or PUSCH) transmitted in a time unit larger than the mini slot may also be referred to as PDSCH (PUSCH) mapping type a. The PDSCH (or PUSCH) transmitted using mini-slots may also be referred to as PDSCH (PUSCH) mapping type B.

The radio frame, subframe, slot, mini-slot, and symbol all represent a unit of time when a signal is transmitted. The radio frame, subframe, slot, mini-slot and symbol may also use other names corresponding to each. In addition, time units such as frames, subframes, slots, mini-slots, symbols, etc. in the present disclosure may be replaced with each other.

For example, one subframe may also be referred to as a TTI, a plurality of consecutive subframes may also be referred to as TTIs, and one slot or one mini-slot may also be referred to as a TTI. That is, at least one of the subframe and TTI may be a subframe (1 ms) in the conventional LTE, may be a period shorter than 1ms (for example, 1 to 13 symbols), or may be a period longer than 1 ms. The unit indicating TTI may be referred to as a slot, a mini slot, or the like, instead of a subframe.

Here, the TTI refers to, for example, the minimum time unit of scheduling in wireless communication. For example, in the LTE system, the base station performs scheduling for allocating radio resources (frequency bandwidth, transmission power, and the like usable by each user terminal) to each user terminal in TTI units. In addition, the definition of TTI is not limited thereto.

The TTI may be a transmission time unit of a channel-coded data packet (transport block), code block, code word, or the like, or may be a processing unit of scheduling, link adaptation, or the like. When a TTI is given, a time interval (for example, the number of symbols) to which transport blocks, code blocks, codewords, and the like are actually mapped may be shorter than the TTI.

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

The TTI having the time length of 1ms may also be referred to as a normal TTI (TTI in 3gpp rel.8-12), a standard TTI, a long TTI, a normal subframe, a standard subframe, a long subframe, a slot, and the like. A TTI shorter than a normal TTI may also be referred to as a shortened TTI, a short TTI, a partial TTI, a shortened subframe, a short subframe, a mini-slot, a sub-slot, a slot, etc.

In addition, a long TTI (e.g., a normal TTI, a subframe, etc.) may be replaced with a TTI having a time length exceeding 1ms, and a short TTI (e.g., a shortened TTI, etc.) may be replaced with a TTI having a TTI length smaller than that of the long TTI and equal to or longer than 1 ms.

A Resource Block (RB) is a Resource allocation unit in the time domain and the frequency domain, and may include one or more continuous subcarriers (subcarriers) in the frequency domain. The number of subcarriers included in an RB may be the same regardless of the parameter set, and may be 12, for example. The number of subcarriers included in the RB may also be decided based on the parameter set.

In addition, an RB may include one or more symbols in the time domain, and may have a length of one slot, one mini-slot, one subframe, or one TTI. One TTI, one subframe, and the like may be formed of one or more resource blocks.

In addition, one or more RBs may also be referred to as a Physical Resource Block (PRB), a subcarrier Group (SCG), a Resource Element Group (REG), a PRB pair, an RB pair, and the like.

In addition, a Resource block may be composed of one or more Resource Elements (REs). For example, one RE may also be a radio resource region of one subcarrier and one symbol.

The Bandwidth Part (BWP) (which may be referred to as a partial Bandwidth) may also indicate a subset of consecutive common RBs (common resource blocks) for a certain parameter set in a certain carrier. Here, the common RB may also be determined by an index of an RB with reference to a common reference point of the carrier. PRBs may also be defined in a certain BWP and are numbered within the BWP.

The BWP may include UL BWP (UL BWP) and DL BWP (DL BWP). For the UE, one or more BWPs may also be set within one carrier.

At least one of the set BWPs may be active, and the UE may not expect to transmit and receive a specific signal/channel other than the active BWP. In addition, "cell", "carrier", and the like in the present disclosure may also be replaced with "BWP".

The above-described configurations of radio frames, subframes, slots, mini slots, symbols, and the like are merely examples. For example, the configuration such as the number of subframes included in a radio frame, the number of slots per subframe or radio frame, the number of mini-slots included in a slot, the number of symbols and RBs included in a slot or mini-slot, the number of subcarriers included in an RB, and the number of symbols, symbol length, cyclic Prefix (CP) length in a TTI can be variously changed.

The information, parameters, and the like described in the present disclosure may be expressed as absolute values, relative values to specific values, or other corresponding information. For example, the radio resource may also be indicated by a specific index.

In the present disclosure, the names used for the parameters and the like are not limitative names in all aspects. Further, the mathematical expressions and the like using these parameters may be different from those explicitly disclosed in the present disclosure. The various channels (PUCCH, PDCCH, etc.) and information elements can be identified by any suitable names, and thus the various names assigned to these various channels and information elements are not limitative names in all aspects.

Information, signals, and the like described in the present disclosure may be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, and the like that may be referenced throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or photons, or any combination thereof.

Further, information, signals, and the like can be output in at least one direction of: from a higher layer (upper layer) to a lower layer (lower layer) and from a lower layer to a higher layer. Information, signals, and the like may be input and output via a plurality of network nodes.

The input/output information, signals, and the like may be stored in a specific location (for example, a memory) or may be managed by a management table. The inputted and outputted information, signals, etc. may be overwritten, updated, or appended. The output information, signals, etc. may also be deleted. The input information, signals, etc. may also be transmitted to other devices.

The information notification is not limited to the embodiment and embodiment described in the present disclosure, and may be performed by other methods. For example, the Information notification in the present disclosure may be implemented by physical layer signaling (e.g., downlink Control Information (DCI)), uplink Control Information (UCI)), higher layer signaling (e.g., radio Resource Control (RRC)) signaling, broadcast Information (Master Information Block (MIB)), system Information Block (SIB)), or the like), medium Access Control (MAC) signaling), other signals, or a combination thereof.

The physical Layer signaling may also be referred to as Layer 1/Layer 2 (L1/L2)) control information (L1/L2 control signal), L1 control information (L1 control signal), and the like. The RRC signaling may also be referred to as an RRC message, and may be, for example, an RRC Connection Setup (RRC Connection Setup) message, an RRC Connection Reconfiguration (RRC Connection Reconfiguration) message, or the like. The MAC signaling may be notified using a MAC Control Element (CE), for example.

Note that the notification of the specific information (for example, the notification of "X") is not limited to an explicit notification, and may be performed implicitly (for example, by not performing the notification of the specific information or by performing the notification of other information).

The decision may be made by a value (0 or 1) represented by one bit, by a true-false value (boolean value) represented by true (true) or false (false), or by a comparison of values (e.g., with a specific value).

Software, whether referred to as software (software), firmware (firmware), middleware-ware (middle-ware), microcode (micro-code), hardware description language, or by other names, should be construed broadly to mean instructions, instruction sets, code (code), code segments (code segments), program code (program code), programs (program), subroutines (sub-program), software modules (software module), applications (application), software applications (software application), software packages (software packages), routines (routine), subroutines (sub-routine), objects (object), executables, threads of execution, procedures, functions, and the like.

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

The terms "system" and "network" as used in this disclosure can be used interchangeably. "network" may also mean a device (e.g., a base station) included in a network.

In the present disclosure, terms such as "precoding", "precoder", "weight", "Quasi-Co-Location (QCL)", "Transmission setting Indication state (TCI state)", "spatial relationship (spatial relationship)", "spatial domain filter", "Transmission power", "phase rotation", "antenna port group", "layer", "rank", "resource set", "resource group", "beam width", "beam angle", "antenna element", "panel", and the like can be used interchangeably.

In the present disclosure, terms such as "Base Station (BS)", "wireless Base Station", "fixed Station (fixed Station)", "NodeB", "eNB (eNodeB)", "gNB (gtnodeb)", "access Point (access Point)", "Transmission Point (TP)", "Reception Point (RP)", "Transmission Reception Point (TRP)", "panel", "cell", "sector", "cell group", "carrier", "component carrier" can be used interchangeably. There are also cases where a base station is referred to by terms such as macrocell, smallcell, femtocell, picocell, and the like.

A base station can accommodate one or more (e.g., three) cells. When a base station accommodates a plurality of cells, the entire coverage area of the base station can be divided into a plurality of smaller areas, and each smaller area can also provide a communication service through a base station subsystem (e.g., an indoor small base station (Remote Radio Head (RRH))). The term "cell" or "sector" refers to a portion or the entirety of the coverage area of at least one of the base stations and base station subsystems that is in communication service within the coverage area.

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

There are also instances when a mobile station is referred to as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset (hand set), user agent, mobile client, or several other suitable terms.

At least one of the base station and the mobile station may also be referred to as a transmitting apparatus, a receiving apparatus, a wireless communication apparatus, and the like. At least one of the base station and the mobile station may be a device mounted on a mobile body, a mobile body main body, or the like. The mobile body may be a vehicle (e.g., a vehicle, an airplane, etc.), an unmanned mobile body (e.g., a drone (a drone), an autonomous vehicle, etc.), or a robot (a manned or unmanned type). In addition, at least one of the base station and the mobile station includes a device that does not necessarily move when performing a 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.

In addition, the base station in the present disclosure may also be replaced with a user terminal. For example, the various aspects/embodiments of the present disclosure may also 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 (e.g., may also be referred to as Device-to-Device (D2D)), vehicle networking (V2X), and the like). In this case, the user terminal 20 may have the functions of the base station 10 described above. Also, terms such as "upstream" and "downstream" may be replaced with terms corresponding to inter-terminal communication (e.g., "side"). For example, the uplink channel, the downlink channel, and the like may be replaced with the side channel.

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

In the present disclosure, the operation performed by the base station is assumed to be performed by an upper node (upper node) in some cases. Obviously, in a network including one or more network nodes (network nodes) having a base station, various operations performed for communication with a terminal may be performed by the base station, one or more network nodes other than the base station (for example, considering a Mobility Management Entity (MME), a Serving-Gateway (S-GW), etc., but not limited thereto), or a combination thereof.

The aspects and embodiments described in the present disclosure may be used alone, or in combination, or may be used in combination with each other. Note that, the processing procedures, sequences, flowcharts, and the like of the embodiments and embodiments described in the present disclosure may be reversed in order unless contradictory. For example, elements of various steps are presented in the order illustrated for the method described in the present disclosure, but the method is not limited to the specific order presented.

The aspects/embodiments described in the present disclosure may also be applied to Long Term Evolution (LTE), LTE-Advanced (LTE-a), LTE-Beyond (LTE-B), SUPER3G, IMT-Advanced, fourth generation mobile communication system (4G)), fifth generation mobile communication system (5G), sixth generation mobile communication system (6G)), x generation mobile communication system (xG) (xG (x is, for example, an integer, a decimal)), future Radio Access (Future Access (FRA)), new Radio Access Technology (New-Radio Access (RAT (NR)), new radio access (NX)), new generation radio access (FX), global System for Mobile communications (GSM (registered trademark)), CDMA2000, ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, ultra-WideBand (UWB)), bluetooth (registered trademark), a System using another appropriate wireless communication method, a next generation System extended based on these, and the like. Furthermore, multiple systems may also be applied in combination (e.g., LTE or LTE-a, combination with 5G, etc.).

The term "based on" used in the present disclosure does not mean "based only on" unless otherwise specified. In other words, the recitation of "based on" means both "based only on" and "based at least on".

Any reference to the use of the terms "first," "second," etc. in this disclosure does not fully define the amount or order of such elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Thus, references to first and second elements do not imply that only two elements may be employed or that the first element must somehow override the second element.

The term "determining" used in the present disclosure may include various operations. For example, the "determination (decision)" may be a case where the "determination (decision)" is performed, such as determination (rounding), calculation (calculating), processing (processing), derivation (deriving), investigation (investigating), search (looking up), search, inquiry (querying)) (for example, search in a table, a database, or another data structure), confirmation (intercepting), or the like.

The "determination (decision)" may be a case where reception (e.g., reception information), transmission (e.g., transmission information), input (input), output (output), access (access) (e.g., access to data in a memory), and the like are regarded as "determination (decision)".

The "determination (decision)" may be a case where the solution (resolving), selection (selecting), selection (breathing), establishment (evaluating), comparison (comparing), and the like are regarded as the "determination (decision)" to be performed. That is, "judgment (decision)" may also be a case where some actions are regarded as being "judgment (decision)".

The "determination (decision)" may be replaced with "assumption", "expectation", "consideration", and the like.

The terms "connected", "coupled" or all variations thereof as used in this disclosure mean all connections or couplings, direct or indirect, between two or more elements and can include the presence of one or more intervening elements between two elements that are "connected" or "coupled" to each other. The combination or connection between the elements may be physical, logical, or a combination thereof. For example, "connect" may also be replaced with "access".

In the present disclosure, where two elements are connected, it is contemplated that they may be "connected" or "joined" to each other using more than one wire, cable, printed electrical connection, or the like, as well as using electromagnetic energy having wavelengths in the wireless frequency domain, the microwave region, the optical (both visible and invisible) region, or the like, as several non-limiting and non-limiting examples.

In the present disclosure, the term "a is different from B" may mean "a and B are different from each other". In addition, the term may also mean "A and B are different from C, respectively". The terms "separate", "combined", and the like are also to be construed as the same as "different".

In the present disclosure, when the terms "include", "including", and "including" and their modifications are used, these terms are intended to have inclusive meanings as similar to the terms "comprising". Further, the term "or" used in the present disclosure does not mean exclusive or.

In the present disclosure, for example, in the case where articles are added by translation as in a, an, and the in english, the present disclosure may also include the case where nouns following these articles are plural.

Although the invention according to the present disclosure has been described in detail above, it will be apparent 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 a modification and a variation without departing from the spirit and scope of the invention defined by the claims. Accordingly, the description of the present disclosure is intended to be illustrative, and not to limit the invention in any way.

Claims

1. A terminal, having:

a control unit configured to determine a triggered SRS resource set among more than three aperiodic SRS resource sets, namely A-SRS resource sets, based on a combination of an SRS request field, which is a measurement reference signal request field, included in DCI, which is downlink control information, and other information; and

and a transmitting unit configured to transmit an a-SRS based on the triggered SRS resource set.

2. The terminal of claim 1, wherein,

the other information is an SRI field that is an SRS resource indicator field included in the DCI.

3. The terminal of claim 2, wherein,

the transmission unit does not perform transmission of an uplink shared channel based on the SRI field when transmitting the a-SRS based on the triggered SRS resource set.

4. The terminal of claim 1, wherein,

the other information is a resource of a downlink control channel in which the DCI is detected.

5. A wireless communication method of a terminal, comprising:

a step of determining a triggered SRS resource set among more than three aperiodic SRS resource sets, namely, A-SRS resource sets, based on a combination of an SRS request field, which is a measurement reference signal request field included in DCI, which is downlink control information, and other information; and

a step of transmitting an A-SRS based on the triggered SRS resource set.

6. A base station having:

a control unit configured to control a triggered SRS resource set among a-SRS resource sets that are more than three aperiodic SRS resource sets based on a combination of an SRS request field that is a measurement reference signal request field included in DCI that is downlink control information and other information; and

and a transmission unit configured to transmit the DCI.