Terminal, wireless communication method, and base station

Abstract

A terminal according to one aspect of the present disclosure is characterized by comprising: a reception unit that receives a medium access control control element (MAC CE) including information indicating activation or deactivation for each of sounding reference signal (SRS) resources; and a control unit that controls SRS transmission on the basis of the information. According to one aspect of the present disclosure, SRS transmission can be appropriately controlled when antenna switching is configured as a usage of an SRS.

Description

Technical Field

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

Background Art

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

[0003] Successor systems to LTE (for example, also referred to as 5th generation mobile communication system (5G), 5G+(plus), 6th generation mobile communication system (6G), New Radio (NR), 3GPP Rel. 15 and later, etc.) are also being considered.

Prior Art Documents

Non-Patent Documents

[0004]

Non-Patent Document 1

Summary of the Invention

[0005] In Rel.15 NR, the Sounding Reference Signal (SRS) transmitted by terminals (User Equipment (UE)) has a wide range of applications. Furthermore, extensions to the SRS are being considered for future wireless communication systems (e.g., Rel.17).

[0006] In Rel.15 NR, antenna switching can be configured as an SRS application. However, the configuration of SRS when antenna switching is configured as an SRS application is insufficiently considered. In this case, it may become difficult for the UE to properly perform SRS transmission, potentially leading to a decrease in communication throughput.

[0007] Therefore, one of the objectives of this disclosure is to provide a terminal, a wireless communication method, and a base station that can appropriately control SRS transmission when antenna switching is set as the application for SRS. [Means for solving the problem]

[0008] A terminal according to one aspect of this disclosure includes first information indicating the activation or deactivation of each Sounding Reference Signal (SRS) resource whose purpose is antenna switching, and second information indicating the activation or deactivation of each SRS resource set including the SRS resource. one A receiving unit that receives a Medium Access Control Control Element (MAC CE), Corresponding to the second piece of information mentioned above The system includes a control unit that controls the transmission of SRS based on the first information, wherein the first information is a bitmap in which each bit corresponds to the SRS resource, and one bit in the bitmap is In the second piece of information mentioned above This is characterized by indicating the activation or deactivation of one of the SRS resources within the SRS resource set. [Effects of the Invention]

[0009] According to one aspect of this disclosure, SRS transmission can be appropriately controlled when antenna switching is configured for the use of SRS. [Brief explanation of the drawing]

[0010] [Figure 1] This figure shows an example of the correspondence between SRS resources and antenna ports in the case of 1T2R in Rel.16. [Figure 2] This figure shows an example of the correspondence between SRS resources and antenna ports in the case of 2T4R in Rel.16. [Figure 3] This figure shows the first example of the correspondence between SRS resources and antenna ports in the case of 1T4R in Rel.16. [Figure 4] This figure shows a second example of the correspondence between SRS resources and antenna ports in the case of 1T4R in Rel.16. [Figure 5] This figure shows a third example of the correspondence between SRS resources and antenna ports in the case of 1T4R in Rel.16. [Figure 6] This figure shows the first example of the correspondence between SRS resources and antenna ports in the case of 1T6R in Rel.16. [Figure 7] This figure shows a second example of the correspondence between SRS resources and antenna ports in the case of 1T6R in Rel.16. [Figure 8] This figure shows the first example of the correspondence between SRS resources and antenna ports in the case of 1T8R in Rel.16. [Figure 9] This figure shows the first example of the correspondence between SRS resources and antenna ports in the case of 1T8R in Rel.16. [Figure 10] This figure shows an example of the correspondence between SRS resources and antenna ports in the case of 2T6R in Rel.16. [Figure 11] This figure shows an example of the correspondence between SRS resources and antenna ports in the case of 2T8R in Rel.16. [Figure 12]It is a diagram showing a correspondence example between SRS resources and antenna ports in the case of 4T8R in Rel.16. [Figure 13] It is a diagram showing a correspondence example between SRS resources and antenna ports in the case of 1T2R in the first embodiment. [Figure 14] It is a diagram showing a correspondence example between SRS resources and antenna ports in the case of 2T4R in the first embodiment. [Figure 15] It is a diagram showing a first example of the correspondence between SRS resources and antenna ports in the case of 1T4R in the first embodiment. [Figure 16] It is a diagram showing a second example of the correspondence between SRS resources and antenna ports in the case of 1T4R in the first embodiment. [Figure 17] It is a diagram showing a third example of the correspondence between SRS resources and antenna ports in the case of 1T4R in the first embodiment. [Figure 18] It is a diagram showing a correspondence example between SRS resources and antenna ports in the case of 1T6R in the first embodiment. [Figure 19] It is a diagram showing a correspondence example between SRS resources and antenna ports in the case of 1T8R in the first embodiment. [Figure 20] It is a diagram showing a correspondence example between SRS resources and antenna ports in the case of 2T6R in the first embodiment. [Figure 21] It is a diagram showing a correspondence example between SRS resources and antenna ports in the case of 2T8R in the first embodiment. [Figure 22] It is a diagram showing a correspondence example between SRS resources and antenna ports in the case of 4T8R in the first embodiment. [Figure 23] It is a diagram showing a correspondence example between SRS resources and antenna ports in the case of 1T2R in Rel.16. [Figure 24] It is a diagram showing a correspondence example between SRS resources and antenna ports in the case of 1T1R in Rel.16. [Figure 25] It is a diagram showing a correspondence example between the SRS resource set and entries in Modification Example 2. [Figure 26] Figures 26A and 26B show a first example of MAC CE according to embodiment 2-1. [Figure 27] Figures 27A and 27B show a first example of MAC CE according to embodiment 2-1. [Figure 28] Figures 28A and 28B show a first example of MAC CE according to embodiment 2-2. [Figure 29] Figures 29A and 29B show a second example of MAC CE according to embodiment 2-2. [Figure 30] Figures 30A and 30B show a third example of MAC CE according to embodiment 2-2. [Figure 31] Figures 31A and 31B show a fourth example of MAC CE according to embodiment 2-2. [Figure 32] Figure 32 shows an example of a schematic configuration of a wireless communication system according to one embodiment. [Figure 33] Figure 33 shows an example of the configuration of a base station according to one embodiment. [Figure 34] Figure 34 shows an example of the configuration of a user terminal according to one embodiment. [Figure 35] Figure 35 shows an example of the hardware configuration of a base station and a user terminal according to one embodiment. [Figure 36] Figure 36 shows an example of a vehicle according to one embodiment. [Modes for carrying out the invention]

[0011] (SRS) In Rel.15 NR, the Sounding Reference Signal (SRS) has a wide range of applications. The NR SRS is used not only for uplink (UL) CSI measurement, as was done in existing LTE (LTE Rel.8-14), but also for downlink (DL) CSI measurement and beam management. The SRS may also be used for positioning.

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

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

[0014] A UE may configure one or more SRS resource sets. A single SRS resource set may be associated with a predetermined number of SRS resources. The UE may use common upper-layer parameters with respect to the SRS resources included in a single SRS resource set. In this disclosure, the term "resource set" may be interpreted as "set," "resource group," "group," etc.

[0015] Information regarding SRS resources or resource sets may be set in the UE using upper-layer signaling, physical layer signaling (e.g., Downlink Control Information (DCI)), or a combination thereof.

[0016] SRS configuration information (for example, the "SRS-Config" element of the RRC information element) may include SRS resource set configuration information, SRS resource configuration information, and so on.

[0017] The SRS resource set configuration information (for example, the RRC parameter "SRS-ResourceSet") may include the SRS resource set ID (Identifier) ​​(SRS-ResourceSetId), a list of SRS resource IDs (SRS-ResourceId) used in that resource set, the SRS resource type, and information on the SRS usage. The SRS resource ID may also be called the SRS Resource ID (SRI).

[0018] Here, the SRS resource type may be one of the following: Periodic SRS (P-SRS), Semi-Persistent SRS (SP-SRS), or Aperiodic SRS (A-SRS). The UE may send P-SRS and SP-SRS periodically (or periodically after activation). The UE may send A-SRS based on DCI's SRS request.

[0019] Furthermore, the use of the SRS (the "usage" in the RRC parameters) may include, for example, beam management, codebook, noncodebook, and antenna switching. For example, an SRS for codebook or noncodebook use may be used to determine the precoder for codebook-based or noncodebook-based uplink shared channel (PUSCH) transmissions based on SRI.

[0020] For beam management applications, it may be assumed that only one SRS resource per SRS resource set is transmittable at any given time instant. However, if multiple SRS resources belong to different SRS resource sets, these SRS resources may transmit simultaneously.

[0021] SRS resource configuration information (for example, the "SRS-Resource" parameter in RRC) may include information such as the SRS resource ID (SRS-ResourceId), number of SRS ports, SRS port number, transmission comb, SRS resource mapping (e.g., time and / or frequency resource location, resource offset, resource period, number of repetitions, number of SRS symbols, SRS bandwidth, etc.), hopping, SRS resource type, sequence ID, and spatial relationships.

[0022] The UE may transmit SRS on adjacent symbols equal to the number of SRS symbols among the last six symbols in a slot. The number of SRS symbols may be 1, 2, 4, etc. The UE may also start transmitting SRS from a symbol before the offset, counting from the last symbol in a slot. This offset may be a number of symbols between 0 and 5, given by the RRC parameter "startPosition".

[0023] The repetition factor (RRC parameter "repetitionFactor") may be less than or equal to the number of SRS symbols. If the repetition factor is 2 or greater, the SRS symbols may be transmitted repeatedly across multiple slots.

[0024] The UE may switch the Bandwidth Part (BWP) that transmits SRS for each slot, or it may switch the antenna. The UE may also apply at least one of intra-slot hopping and inter-slot hopping to SRS transmission.

[0025] (SRS antenna switching) As mentioned above, in Rel.15 NR, antenna switching (which may also be called antenna port switching) can be configured as an application for SRS. SRS antenna switching may be used, for example, in a Time Division Duplex (TDD) band when acquiring the downlink CSI using the uplink SRS.

[0026] For example, for a UE that has the capability of having fewer antenna ports available for transmission than for reception, UL's SRS measurement may be used to determine the DL precoder.

[0027] The UE may also report UE capability information to the network indicating the supported SRS transmit port switching pattern (e.g., the RRC parameter "supportedSRS-TxPortSwitch"). This pattern may be expressed in the form of "txry", such as "t1r2", "t2r4", etc., which may mean that SRS transmission can be performed using x antenna ports out of a total of y antennas (may be written as xTyR). Here, y may correspond to all or a subset of the UE's receiving antennas.

[0028] For example, a 2T4R (2 transmit ports, 4 receive ports) UE may be configured with an SRS resource set that includes two SRS resources, each with two ports, for DL ​​CSI acquisition, and whose purpose is antenna switching.

[0029] Note that if x and y in "txty" have the same value, it may also be written as xT=xR (for example, 4T=4R).

[0030] The UE may assume that the start symbols of each SRS resource in an SRS resource set used for antenna switching are different from each other. The UE may also assume that there are guard periods between SRS resources in the same SRS resource set.

[0031] The guard period may also be called the no-transmission period, SRS switching period, port switching period, etc. The UE may assume that no signals (e.g., any other signals) are transmitted during the guard period in the slot where PUSCH is transmitted.

[0032] The UE may use the guard period to turn on (may also be called activating, starting up, etc.) the antenna port to be used for the next SRS transmission.

[0033] The length of the guard period between SRS resources may be greater than or equal to the minimum guard period Y (Y=1 or 2 symbols) between SRS resources as shown in 3GPP TS 38.214 Table 6.2.1.2-1. For example, Y=1 (when Subcarrier Spacing (SCS)) = 15, 30, or 60 kHz), Y=2 (when SCS = 120 kHz), etc.

[0034] The UE of Rel.15 / 16 NR expects the same number of SRS ports to be configured for all SRS resources within the SRS resource set used for antenna switching.

[0035] UEs in Rel.15 / 16 NR that reported 1T1R, 2T4R, and 1T4R capabilities do not expect more than one SRS resource set to be configured or triggered in the same slot.

[0036] UEs in Rel.15 / 16 NR that reported the capabilities of 1T=1R, 2T=2R, and 4T=4R do not expect more than one SRS resource set to be configured or triggered in the same symbol.

[0037] <Specific examples of settings for applying antenna switching> For example, to obtain DL CSI, the SRS usage is set to "antenna switching". Rel.16 supports 1T1R, 2T2R, 4T4R, 1T2R, 2T4R, and 1T4R. The following describes 1T2R, 2T4R, and 1T4R in Rel.16.

[0038] In the case of 1T2R, one SRS resource set may have two SRS resources, and each SRS resource may have a single SRS port (Figure 1). The SRS port of the first resource in the SRS resource set is associated with a different UE antenna port than the SRS port of the second resource in the same set.

[0039] In the case of 2T4R, one SRS resource set has two SRS resources, and each SRS resource may have two SRS ports (which may also be called port pairs) (Figure 2). The SRS port pairs of the first SRS resource are associated with different UE antenna port pairs than the SRS port pairs of the second SRS resource. In Figure 2, UE antenna ports #0 and #1 are a pair, and UE antenna ports #2 and #3 are a pair.

[0040] In the case of 1T4R, one P / SP SRS resource set may have four SRS resources, and each SRS resource may have a single SRS port (Figure 3). Each SRS port of each SRS resource is associated with a different UE antenna port.

[0041] In the case of 1T4R, two AP SRS resource sets may have a total of four SRS resources, and the SRS ports of each SRS resource in the two resource sets may be associated with different UE antenna ports (Figures 4 and 5). The two resource sets may each have two SRS resources (Figure 4). Alternatively, one resource set in the two resource sets may have one SRS resource, and the other resource set may have three SRS resources (Figure 5).

[0042] Rel.17 is also considering supporting 1T6R, 1T8R, 2T6R, 2T8R, and 4T8R.

[0043] In the case of 1T6R, one P / SP SRS resource set may have six SRS resources, and each SRS resource may have a single SRS port (Figure 6). Each SRS port of an SRS resource within the SRS resource set is associated with a different UE antenna port.

[0044] In the case of 1T6R, the two AP SRS resource sets have a total of six SRS resources, and each SRS resource may have a single SRS port (Figure 7). The SRS ports of each SRS resource in the two resource sets are associated with different UE antenna ports. Note that the number of AP SRS resource sets may be three.

[0045] In the case of 1T8R, one P / SP SRS resource set may have eight SRS resources, and each SRS resource may have a single SRS port (Figure 8). The SRS ports of different SRS resources within the SRS resource set are associated with different UE antenna ports.

[0046] In the case of 1T8R, two AP SRS resource sets may have a total of eight SRS resources, and each SRS resource may have a single SRS port (Figure 9). The SRS port of each SRS resource in the two SRS resource sets is associated with a different UE antenna port. The number of AP SRS resource sets may be three or four.

[0047] In the case of 2T6R, one P / SP / AP SRS resource set may have three SRS resources, and each SRS resource may have two SRS ports (Figure 10). Each pair of SRS ports of each SRS resource in the SRS resource set is associated with a different pair of UE antenna ports. In Figure 10, UE antenna ports #0 and #1 are a pair, UE antenna ports #2 and #3 are a pair, and UE antenna ports #4 and #5 are a pair. The number of AP SRS resource sets may be two or three, and each SRS resource set may have one or two SRS resources.

[0048] In the case of 2T8R, one P / SP / AP SRS resource set may have four SRS resources, and each SRS resource may have two SRS ports (Figure 11). Each pair of SRS ports in the SRS resource set is associated with a different pair of UE antenna ports. In Figure 11, UE antenna ports #0 and #1 are paired, UE antenna ports #2 and #3 are paired, UE antenna ports #4 and #5 are paired, and UE antenna ports #6 and #7 are paired. The number of AP SRS resource sets may be two, three, or four, and each SRS resource set may have one, two, or three SRS resources.

[0049] In the case of 4T8R, one P / SP / AP SRS resource set may have two SRS resources, and each SRS resource may have four SRS ports (Figure 12). Each SRS port of each SRS resource within the SRS resource set is associated with a different UE antenna port. There may be two AP SRS resource sets, and each SRS resource set may have one SRS resource.

[0050] (analysis) As mentioned above, antenna switching can be configured as an SRS application in Rel.15 NR. However, the configuration of SRS when antenna switching is configured as an SRS application has not been adequately considered. In this case, it may become difficult for the UE to properly control SRS transmission, potentially leading to a decrease in communication throughput.

[0051] For example, in Rel.16 / 17, P / SP / AP SRS resource transmission is configured / activated / triggered for each SRS resource set. However, the configuration when multiple SRS resource sets are applied was unclear.

[0052] Furthermore, when an SRS resource set is configured / activated / triggered, the UE transmits all SRS resources within that SRS resource set. Since each SRS resource is associated with a UE antenna port / UE antenna port pair (group), when a P / SP / AP SRS resource set is configured / activated / triggered, the CSI of all UE antenna ports is obtained.

[0053] However, with the help of artificial intelligence (AI), for example, the network may not always need to acquire the CSI of all UE antenna ports. For example, it may only need to acquire the CSI of some UE antenna ports. In such cases, if the configuration / startup / triggering of the SRS resource set for antenna switching is not flexible, SRS overhead may increase and communication throughput may decrease.

[0054] Therefore, the inventors conceived of a terminal that can receive appropriate settings when antenna switching is configured as an application for SRS.

[0055] The embodiments of this disclosure will be described in detail below with reference to the drawings. Each wireless communication method according to the embodiments may be applied individually or in combination.

[0056] In this disclosure, "A / B" and "at least one of A and B" may be interpreted as mutually exclusive. In this disclosure, "A / B / C" may mean "at least one of A, B, and C".

[0057] In this disclosure, terms such as activate, deactivate, indicate, select, configure, update, and determine may be interpreted interchangeably. In this disclosure, terms such as support, control, controllable, operate, and operable may be interpreted interchangeably.

[0058] In this disclosure, Radio Resource Control (RRC), RRC parameters, RRC messages, higher-layer parameters, information elements (IE), settings, etc., may be interpreted interchangeably. In this disclosure, Medium Access Control elements (MAC Control Element (CE)), update commands, activation / deactivation commands, etc., may be interpreted interchangeably.

[0059] In this disclosure, the upper-layer signaling may be, for example, Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, or a combination thereof.

[0060] In this disclosure, MAC signaling may include, for example, MAC Control Elements (MAC CEs) and MAC Protocol Data Units (PDUs). Broadcast information may include, for example, Master Information Blocks (MIBs), System Information Blocks (SIBs), Remaining Minimum System Information (RMSIs), and Other System Information (OSIs).

[0061] In this disclosure, physical layer signaling may include, for example, Downlink Control Information (DCI) and Uplink Control Information (UCI).

[0062] In this disclosure, terms such as index, identifier (ID), indicator, and resource ID may be interpreted interchangeably. In this disclosure, terms such as sequence, list, set, group, cluster, and subset may be interpreted interchangeably.

[0063] In this disclosure, the terms used include: panel, UE panel, panel group, beam, beam group, precoder, Uplink (UL) transmit entity, Transmission / Reception Point (TRP), base station, Spatial Relation Information (SRI), spatial relationship, SRS Resource Indicator (SRI), Control Resource Set (CORESET), Physical Downlink Shared Channel (PDSCH), Codeword (CW), Transport Block (TB), Reference Signal (RS), antenna port (e.g., Demodulation Reference Signal (DMRS) port), antenna port group (e.g., DMRS port group), group (e.g., spatial relationship group, Code Division Multiplexing (CDM) group, reference signal group, CORESET group, Physical Uplink Control Channel (PUCCH) groups, PUCCH resource groups, resources (e.g., reference signal resources, SRS resources), resource sets (e.g., reference signal resource sets), CORESET pools, downlink Transmission Configuration Indication state (TCI state) (DL TCI state), uplink TCI state (UL TCI state), unified TCI state, common TCI state, quasi-co-location (QCL), QCL assumptions, etc., may be interpreted interchangeably.

[0064] Furthermore, the spatial relationship information Identifier (ID) (TCI state ID) and spatial relationship information (TCI state) may be interpreted as mutually exclusive. "Spatial relationship information" may be interpreted as mutually exclusive as "a set of spatial relationship information," "one or more spatial relationship information," etc. TCI state and TCI may be interpreted as mutually exclusive.

[0065] In this disclosure, the notation "Rel.XX" refers to a 3GPP release. However, the release number "XX" is an example and may be replaced with other numbers.

[0066] In this disclosure, P SRS and P-SRS may be interpreted interchangeably. In this disclosure, SP SRS and SP-SRS may be interpreted interchangeably. In this disclosure, AP SRS and AP-SRS may be interpreted interchangeably. Resource set group and SRS resource set group may be interpreted interchangeably.

[0067] (Wireless communication method) <First Embodiment> This document describes a new configuration method for SRS resource sets that are used for antenna switching and apply 1T2R, 1T4R, 2T4R, 1T6R, 1T8R, 2T6R, 2T8R, and 4T8R. The UE may receive configurations for multiple SRS resource sets, each containing one or more types (resource types) of measurement reference signal (SRS) resource sets, and based on these configurations, control the transmission of SRS using the antenna ports corresponding to the SRS resources within the multiple SRS resource sets. These configurations may also correspond to resource set groups containing multiple SRS resource sets, as described later.

[0068] As mentioned above, a UE may have multiple resource sets (X of them), and these multiple resource sets may have a total of 2 or more resources. For example, 1T2R / 2T4R / 4T8R has a total of 2 resources, 1T4R / 2T8R has a total of 4 resources, 1T6R has a total of 6 resources, 1T8R has a total of 8 resources, and 2T6R has a total of 3 resources. For each resource set, for example, one of the following cases 1 to 7 may apply.

[0069] [Case 1] All X SRS resource sets are P SRS resource sets. [Case 2] All X SRS resource sets are SP SRS resource sets. [Case 3] All X SRS resource sets are AP SRS resource sets. [Case 4] Of the X resource sets, at least one may be a P SRS resource set, and the rest may be SP SRS resource sets. [Case 5] Of the X resource sets, at least one may be a P SRS resource set, and the rest may be AP SRS resource sets. [Case 6] Of the X resource sets, at least one may be an SP SRS resource set, and the rest may be AP SRS resource sets. [Case 7] Of the X resource sets (if X ≥ 3), at least one may be a P SRS resource set, at least one may be an SP SRS resource set, and at least one may be an AP SRS resource set.

[0070] In other words, all X SRS resource sets may be one (same) type of SRS resource set (e.g., cases 1-3), or X SRS resource sets may contain multiple types of resource sets (e.g., cases 4-7). If case 3 is applied, for example, the constraint in Rel. 16 / 17 that "the entries in aperiodicSRS-ResourceTrigger or AperiodicSRS-ResourceTriggerList for each SRS resource set are the same" may be removed.

[0071] In the first embodiment, for SP / AP SRS resource sets / resources, the activation / triggering of SRS resources may be the same as in Rel.16, i.e., activated / triggered for each SRS resource set.

[0072] Regarding the association between SRS resources and UE antenna ports, the following options may be applied:

[0073] [Option 1-1] If all X resource sets are of the same resource type (Case 1 / 2 / 3), then by default, SRS port / SRS port pairs (groups) of different SRS resources within X resource sets may be associated with different UE antenna port / UE antenna port pairs (groups). Here, "by default" may mean that no specific association is made between SRS port / SRS port pairs (groups) and UE antenna port / UE antenna port pairs (groups) of SRS resources.

[0074] [Options 1-2] The UE may be configured with a resource set group containing multiple SRS resource sets (X of them). The UE may receive this configuration via upper-layer signaling / physical-layer signaling.

[0075] Multiple SRS resource sets within a resource set group may have a total of 2 SRS resources in 1T2R / 2T4R / 4T8R, a total of 4 SRS resources in 1T4R / 2T8R, a total of 6 SRS resources in 1T6R, a total of 8 SRS resources in 1T8R, and a total of 3 SRS resources in 2T6R.

[0076] One or more resource set groups may be configured for a UE. Different resource set groups may be configured for each case (cases 1 / 2 / 3 / 4 / 5 / 6 above). Only one resource set group may be configured for each case.

[0077] [[Variation 1]] The UE may assume / determine that X resource sets of the same resource type (P / SP / AP) are included in a single resource set group. These X SRS resource sets may be all resource sets configured in the UE.

[0078] [[Variation 2]] The UE may assume / determine that X SRS resource sets with the same purpose (e.g., antenna switching) are included in a single resource set group. These X SRS resource sets may be all resource sets configured in the UE.

[0079] [[Variation 3]] The UE may assume / determine that X SRS resource sets with the same resource type (P / SP / AP) and the same purpose (e.g., antenna switching) are included in a single SRS resource set group. These X SRS resource sets may be all resource sets configured in the UE.

[0080] In other words, the UE may receive information indicating at least one of the resource types and uses of multiple SRS resource sets, and based on that information, determine the resource set group that includes those multiple SRS resource sets. This allows the UE to determine the resource set group to which a resource set belongs without receiving information that explicitly indicates the resource set group corresponding to that resource set.

[0081] By applying resource set groups, comprehensive settings can be configured for each resource set group, even if the SRS resource set contains only a few SRS resources (e.g., one). This allows for flexible channel measurements and other operations for each SRS resource (and corresponding antenna port).

[0082] [Options 1-3] The UE antenna ports / UE antenna port pairs (groups) associated with each SRS port / SRS port pair (group) of each SRS resource / resource set may be explicitly configured for each SRS resource / SRS resource set. This configuration may be performed by upper-layer signaling / physical-layer signaling.

[0083] The UE may maintain the same association between the UE antenna port and the SRS resource. The UE may maintain the same association for a specific period of time. This period may be a predefined / configured time known to both the base station (e.g., gNB) and the UE. The association may be updated by instructions / reports from the UE to the base station. The association may be updated by instructions / configurations from the base station to the UE.

[0084] [Specific example] In the case of 1T2R, one resource set group may have two P / SP / AP SRS resource sets, and each SRS resource set may have one SRS resource (Figure 13). Each SRS resource may have one SRS port. For example, if a network (base station) needs to acquire the CSI of a specific UE antenna port (e.g., antenna port #0), the network may activate / trigger only the SRS resource set (SRS resource set #0) that contains the SRS resource (SRS port) corresponding to that UE antenna port. The same applies to other examples.

[0085] In the case of 2T4R, one resource set group may have two P / SP / AP SRS resource sets, and each SRS resource set may have one SRS resource (Figure 14). Each SRS resource may have two SRS ports.

[0086] In the case of 1T4R, a single resource set group may have two, three, or four P / SP / AP SRS resource sets, and the two, three, or four resource sets within an SRS resource set group may have a total of four SRS resources (Figures 15, 16, and 17). Each SRS resource may have one SRS port.

[0087] For example, in the case of 1T4R, one resource set group may have four P / SP / AP SRS resource sets, and each SRS resource set may have one SRS resource (Figure 15). Each SRS resource may have one SRS port.

[0088] For example, in the case of 1T4R, one resource set group may have two P / SP / AP SRS resource sets, and each SRS resource set may have two SRS resources (Figure 16). Each SRS resource may have one SRS port.

[0089] For example, in the case of 1T4R, one resource set group may have two P / SP / AP SRS resource sets, one SRS resource set having one SRS resource and the other SRS resource set having three SRS resources (Figure 17). Each SRS resource may have one SRS port.

[0090] In the case of 1T6R, one resource set group may have 2 / 3 / 4 / 5 / 6 P / SP / AP SRS resource sets, and the SRS resource sets within the resource set group may have a total of 6 SRS resources (Figure 18). Each SRS resource may have one SRS port. Figure 18 shows an example where one resource set group has 2 SRS resource sets, and each SRS resource set has 3 SRS resources.

[0091] In the case of 1T8R, one resource set group may have 2 / 3 / 4 / 5 / 6 / 7 / 8 P / SP / AP SRS resource sets, and the SRS resource sets within the resource set group may have a total of 8 SRS resources (Figure 19). Each SRS resource may have one SRS port. Figure 19 shows an example where one resource set group has 2 SRS resource sets, and each SRS resource set has 4 SRS resources.

[0092] In the case of 2T6R, one resource set group may have 2 or 3 P / SP / AP SRS resource sets, and the SRS resource sets within the resource set group may have a total of 3 SRS resources (Figure 20). Each SRS resource may have 2 SRS ports. Figure 20 shows an example where one resource set group has 3 SRS resource sets, and each SRS resource set has 1 SRS resource.

[0093] In the case of 2T8R, one resource set group may have 2 / 3 / 4 P / SP / AP SRS resource sets, and the SRS resource sets within the resource set group may have a total of 4 SRS resources (Figure 21). Each SRS resource may have 2 SRS ports. Figure 21 shows an example where one resource set group has 2 SRS resource sets, and each SRS resource set has 2 SRS resources.

[0094] In the case of 4T8R, one resource set group may have two P / SP / AP SRS resource sets, and each SRS resource set may have one SRS resource (Figure 22). Each SRS resource may have four SRS ports.

[0095] [Differentiation] In Rel.16, if the UE supports 1T2R, it is not possible to configure the UE with both an SRS resource set for 1T1R and an SRS resource set for 1T2R simultaneously. A specification change is required to enable this configuration. When the UE supports 1T2R, the antenna ports of each SRS resource may be unique within the SRS resource set. Also, for AP SRS resource sets configured in the same entry (e.g., an entry in AperiodicSRS-ResourceTriggerList, an entry in the trigger state), the antenna ports of each SRS resource may be unique within the SRS resource set configured in the same entry.

[0096] Figure 23 shows an example in Rel. 16 where 1T2R is applied and there are two SRS resources within one entry. The antenna ports of the two SRS resources may be unique within the SRS resource set / entry.

[0097] Figure 24 shows an example in Rel. 16 where 1T1R is applied and there is one SRS resource within one entry. The antenna ports of a single SRS resource may be unique within the SRS resource set / entry.

[0098] In Rel.16, only one antenna port setting (xTyR) was possible, making it impossible to perform both settings shown in Figures 23 and 24 above. Therefore, in the modified version, the UE may allow multiple settings (xTyR) to be applied, depending on the UE's capabilities (supportedSRS-TxPortSwitch), even when the usage of the upper layer parameter of the SRS resource set is set to antenna switching. In other words, the UE may have multiple settings applied using different values ​​for at least one of x and y.

[0099] However, it is preferable that the base station (gNB) and the UE can understand the antenna port relationships between SRS resources / resource sets. For this reason, the following variations 1 and 2 may be applied.

[0100] [[Differentiation 1]] The UE may receive information specifying / configuring the antenna port for each SRS resource via upper-layer signaling / physical-layer signaling. For example, the UE may receive an index indicating the antenna port for each SRS resource. In the current specification (Rel.15 / 16), the number of antenna ports can be set for each SRS resource, but it is not possible to specify an antenna port. By specifying / configuring the antenna port as in Modification 1, the UE can easily identify the antenna port to be used when transmitting each SRS resource.

[0101] [[Differentiation 2]] If the same set of SRS resources whose purpose is antenna switching is configured / activated / triggered, the UE may (and may expect) transmit SRS through the same antenna port.

[0102] The base station and UE can determine which antenna ports are identical by different SRS transmissions. Configuration / activation / triggering may be based on higher-layer signaling / physical-layer signaling or specifications. For example, if the UE has multiple SRS resource sets configured with antenna switching in different antenna configurations, Modification 2 may be applied.

[0103] Figure 25 shows an example of the correspondence between SRS resource sets and entries in Modification Example 2. In Figure 25, SRS resource set #1 is configured to trigger entry #0 and #1, and SRS resource set #2 is configured to trigger entry #0 and #2. The UE should use the UE antenna port corresponding to the antenna port of the SRS resource in the SRS resource set corresponding to the configured trigger state. This allows the UE to identify the antenna port based on the SRS resource set / trigger state.

[0104] Furthermore, if multiple SRS resource sets are set to trigger state for a single entry, the UE may (or is assumed to) transmit SRS using different antenna ports among those multiple SRS resource sets.

[0105] <Second Embodiment> The UE may receive information indicating the activation / deactivation of each SRS resource via MAC CE and control SRS transmission based on this information. For example, for SP SRS resources / resource sets, each SRS resource may be activated individually (for each SRS resource) via MAC CE. For AP SRS resources / resource sets, each SRS resource may be triggered individually (for each SRS resource) using trigger DCI. The second embodiment applies, for example, to the configuration of SRS resources whose purpose is antenna switching for 1T2R, 1T4R, 2T4R, 1T6R, 1T8R, 2T6R, 2T8R, and 4T8R. Note that the second embodiment is not limited to SRS resource sets whose purpose is antenna switching, but may also be applicable to SRS resource sets for other purposes (codebook, non-codebook, beam management, positioning, etc.).

[0106] In the second embodiment, the configurations for 1T2R, 2T4R, and 1T4R are the same as those in Rel.16 described above (Figures 1 to 5). Other configurations (xTyR) may also be the same as those in Rel.16.

[0107] The UE may maintain the same association between the UE antenna port and the SRS resource. The UE may maintain the same association for a specific period of time. This period may be a predefined / configured time known to both the base station (e.g., gNB) and the UE. The association may be updated by instructions / reports from the UE to the base station. The association may also be updated by instructions / configurations from the base station to the UE.

[0108] [Aspect 2-1] Figures 26A, 26B, 27A, and 27B show examples of MAC CEs according to Embodiment 2-1. A MAC CE may include a field indicating the SRS resource ID to be activated or deactivated. Hereinafter, the term "field" may be omitted. In this disclosure, each row of the MAC CE is assumed to be 1 octet (8 bits).

[0109] Furthermore, the MAC CE may include at least one field of an identifier (A / D) indicating the activation / deactivation of the SRS resource, the SRS resource's serving cell ID, the SRS resource's BWP ID, and a SUL indication (indicating whether the MAC CE applies to NUL or SUL).

[0110] The MAC CE may include spatial relationship information for the SRS resource being activated. The MAC CE may include fields such as the Reference resource ID used to derive the spatial relationship of the SRS resource, the serving cell ID of the reference resource, and the BWP ID of the reference resource.

[0111] The MAC CE may include an indicator (field C) indicating whether the serving cell ID field and BWP ID field of the referenced resource exist. If they do not exist, the same serving cell / BWP as the SRS resource may be applied to the referenced resource (Figures 26A and 26B). If the referenced resource is CSI-RS or SSB, the MAC CE may include an indicator (field F) indicating whether the referenced resource is CSI-RS or SSB.

[0112] Alternatively, instead of spatial relation information for the SRS resource, the MAC CE may indicate information that represents the TCI state corresponding to the SRS resource being activated (e.g., the Rel.17 TCI state ID used to derive the spatial relation of the SRS resource) (Figures 27A and 27B).

[0113] Furthermore, the MAC CE may include information regarding the activation / deactivation of multiple SRS resources (Figures 26B and 27B). In this case, one MAC CE may include one A / D field corresponding to multiple SRS resources, a serving cell ID field for the SRS resource, and a BWP ID field, while other information (fields) may be set for each SRS resource. In this case, a reserve bit (R) may be used to indicate whether A / D fields exist for multiple SRS resources.

[0114] [Aspect 2-2] Figures 28A, 28B, 29A, 29B, 30A, 30B, 31A, and 31B show examples of MAC CEs in Embodiment 2-2. In Embodiment 2-2, explanations of points similar to those in Embodiment 2-1 may be omitted. The MAC CE includes information indicating activation / deactivation for each SRS resource set. For example, the MAC CE includes a field indicating the SRS resource set ID to be activated / deactivated, and a field indicating specific information (indicators) indicating which SRS resources within that SRS resource set will be activated or deactivated.

[0115] Furthermore, the MAC CE may include at least one of the following: an identifier (A / D) indicating the activation / deactivation of the SRS resource set, an SRS resource set's cell ID field, and an SRS resource set's BWP ID field.

[0116] [[Option 2-2-1]] The specific information described above may also be an index of an SRS resource within an SRS resource set. The index is mapped to the SRS resources in a predefined order. For example, index 0 / 1 / 2 / 3 / ... / N-1 may map to the 1st / 2nd / 3rd / 4th / ... / Nth SRS resource in the resource set. For example, a single SRS resource may have multiple corresponding indexes.

[0117] [[Option 2-2-2]] The specific information described above may also be an index of an SRS resource group within an SRS resource set. An SRS resource group contains one or more SRS resources. For example, index 0 / 1 / ... / N-1 may map to the 1st / 2nd / ... / Nth group. For example, the first group may contain the first and second SRS resources, and the second group may contain the third and fourth SRS resources. For example, a single SRS resource group may have multiple indexes.

[0118] Figures 28A and 28B show the first example of MAC CE for options 2-2-1 and 2-2-2. For "Index of SRS resource / SRS resource group," when option 2-2-1 is applied, the index of the SRS resource is applied, and when option 2-2-2 is applied, the index of the SRS resource group is included. In Figures 28A and 28B, "Index of SRS resource / SRS resource group" is 2 bits, but it may be 1 bit or 3 or more bits. Figure 28A shows an example of MAC CE corresponding to one SRS resource set. Figure 28B shows an example of MAC CE corresponding to multiple SRS resource sets. The same items as in Figures 26A and 26B are omitted from the explanation. In this case, the reserve bit (R) may be used to indicate whether A / D fields exist for multiple SRS resource sets.

[0119] Figures 29A and 29B show second examples of MAC CE for options 2-2-1 and 2-2-2. Figures 29A and 29B differ from Figures 28A and 28B in that instead of spatial relationship information for SRS resources, information indicating the TCI state corresponding to the activated SRS resource (Rel. 17 TCI state ID used to derive the spatial relationship of the SRS resource) is applied. Items similar to those in Figures 28A and 28B are omitted from explanation.

[0120] [[Option 2-2-3]] The specific information described above may be a bitmap where each bit corresponds to an SRS resource, and the 1st / 2nd / 3rd / 4th / ... / Nth bit may be mapped to the 1st / 2nd / 3rd / 4th / ... / Nth SRS resource in the SRS resource set, where N is the Most Significant bit (MSB) or the Least Significant Bit (LSB). A bit set to "1" (or "0") may mean that the SRS resource is active, and a bit set to "0" (or "1") may mean that the SRS resource is inactive.

[0121] [[Option 2-2-4]] The specific information described above may be a bitmap where each bit corresponds to an SRS resource group, and the 1st / 2nd / 3rd / 4th / ... / Nth bit may be mapped to the 1st / 2nd / 3rd / 4th / ... / Nth SRS resource group corresponding to an SRS resource set, where N is the most significant bit (MSB) or the least significant bit (LSB). A bit set to "1" (or "0") may mean that the SRS resource group is active, and a bit set to "0" (or "1") may mean that the SRS resource group is inactive.

[0122] An SRS resource group may contain one or more SRS resources. The grouping of SRS resources may follow predefined rules (specifications) or base station (gNB) configurations / instructions. SRS resource groups may also be instructed to the UE by upper-layer signaling / lower-layer signaling.

[0123] Figures 30A and 30B show the first example of MAC CE for options 2-2-3 and 2-2-4. b0, b1, b2, and b3 correspond to SRS resources (option 3) and SRS resource groups (option 4). In Figures 30A and 30B, the bitmap is 4 bits, but other numbers of bits are also possible. Figure 30A shows an example of MAC CE corresponding to one SRS resource set. Figure 30B shows an example of MAC CE corresponding to multiple SRS resource sets. Items similar to those in Figures 28A and 28B are omitted from explanation. In this case, a reserve bit (R) may be used to indicate whether A / D fields exist for multiple SRS resource sets.

[0124] Figures 31A and 31B show a second example of MAC CE for options 2-2-3 and 2-2-4. Figures 31A and 31B differ from Figures 30A and 30B in that instead of spatial relationship information for SRS resources, information indicating the TCI state corresponding to the activated SRS resource (Rel. 17 TCI state ID used to derive the spatial relationship of SRS resources) is applied. Items similar to those in Figures 30A and 30B are omitted from explanation. Figure 31A shows an example of MAC CE corresponding to one set of SRS resources. Figure 31B shows an example of MAC CE corresponding to multiple sets of SRS resources.

[0125] In Option 2-2-1 to 2-2-4, the 1st / 2nd / 3rd / 4th / ... / Nth SRS resource in the SRS resource set may correspond to the 1st / 2nd / 3rd / 4th / ... / Nth entry of SRS-ResourceIdList (RRC parameter) in the configuration of the SRS resource set. Alternatively, the 1st / 2nd / 3rd / 4th / ... / Nth SRS resource in the SRS resource set may be an SRS resource having the 1st / 2nd / 3rd / 4th / ... / Nth SRS resource ID.

[0126] [AP SRS Resource Trigger Design] The UE may receive information indicating the SRS trigger state for each SRS resource (e.g., the upper layer parameter aperiodicSRS-ResourceTrigger or aperiodicSRS-ResourceTriggerList). Similar to Rel.16, the SRS trigger state may be indicated in the SRS request field of DCI based on the above upper layer parameter.

[0127] Alternatively, the UE may receive information indicating the SRS trigger state for each SRS resource set (e.g., the upper layer parameter aperiodicSRS-ResourceTrigger or aperiodicSRS-ResourceTriggerList). Similar to Rel.16, which SRS resource in the SRS resource set is triggered may be indicated by the DCI that triggers the SRS. This indication may be applied together with Mode 2-2.

[0128] According to the second embodiment, the UE can appropriately control SRS transmission by receiving various configurations for each SRS resource.

[0129] [UE Capability (capability)] A UE may transmit (report) UE capability information to the network (base station) indicating whether it supports at least one of the examples in this disclosure. A UE may also receive instructions / settings (e.g., instructions / settings indicating whether each example is enabled or disabled) regarding at least one of the examples in this disclosure via upper-layer signaling / physical-layer signaling. Such instructions / settings may correspond to the UE capability information transmitted by the UE. At least one of the examples in this disclosure may apply only to at least one of the UE that received such instructions / settings, the UE that transmitted the corresponding UE capability information, and the UE that supports the corresponding UE capability. The UE capability information may be, for example, at least one of (1) to (3) below.

[0130] (1) In the UE sounding procedure for obtaining DL CSI, does the UE support AI assistance? (2) Whether the UE supports the new configuration mode for the SRS resource set shown in the first embodiment. (3) Whether the UE supports the activation / deactivation / triggering of the SRS resource as shown in the second embodiment.

[0131] (Wireless communication system) The configuration of a wireless communication system according to one embodiment of this disclosure will be described below. In this wireless communication system, communication is performed using any or a combination thereof of the wireless communication methods according to the above embodiments of this disclosure.

[0132] Figure 32 shows an example of a schematic configuration of a wireless communication system according to one embodiment. The wireless communication system 1 may be a system that realizes communication using Long Term Evolution (LTE), 5th generation mobile communication system New Radio (5G NR), etc., as specified by the Third Generation Partnership Project (3GPP).

[0133] Furthermore, the wireless communication system 1 may support dual connectivity between multiple Radio Access Technologies (RATs) (Multi-RAT Dual Connectivity (MR-DC)). MR-DC may include dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (EN-DC)), dual connectivity between NR and LTE (NR-E-UTRA Dual Connectivity (NE-DC)), and so on.

[0134] In EN-DC, the LTE (E-UTRA) base station (eNB) is the Master Node (MN), and the NR base station (gNB) is the Secondary Node (SN). In NE-DC, the NR base station (gNB) is the MN, and the LTE (E-UTRA) base station (eNB) is the SN.

[0135] The wireless communication system 1 may support dual connectivity between multiple base stations within the same RAT (for example, dual connectivity where both MN and SN are NR base stations (gNB) (NR-NR Dual Connectivity (NN-DC))).

[0136] The wireless communication system 1 may include a base station 11 that forms a macrocell C1 with relatively wide coverage, and base stations 12 (12a-12c) located within the macrocell C1 that form a small cell C2 that is narrower than the macrocell C1. User terminals 20 may be located within at least one cell. The arrangement and number of each cell and user terminal 20 are not limited to the configuration shown in the figure. Hereinafter, when base stations 11 and 12 are not distinguished, they will be collectively referred to as base station 10.

[0137] The user terminal 20 may be connected to at least one of the multiple base stations 10. The user terminal 20 may utilize at least one of Carrier Aggregation (CA) using multiple Component Carriers (CC) and Dual Connectivity (DC).

[0138] Each CC may be included in at least one of the first frequency band (Frequency Range 1 (FR1)) and the second frequency band (Frequency Range 2 (FR2)). A macrocell C1 may be included in FR1, and a small cell C2 may be included in FR2. For example, FR1 may be a frequency band of 6 GHz or less (sub-6 GHz), and FR2 may be a frequency band above 24 GHz (above-24 GHz). Note that the frequency bands and definitions of FR1 and FR2 are not limited to these, and for example, FR1 may fall in a frequency band higher than FR2.

[0139] Furthermore, the user terminal 20 may communicate using at least one of the following methods at each CC: Time Division Duplex (TDD) and Frequency Division Duplex (FDD).

[0140] Multiple base stations 10 may be connected by wire (e.g., optical fiber compliant with Common Public Radio Interface (CPRI), X2 interface, etc.) or wireless (e.g., NR communication). For example, if NR communication is used as a backhaul between base stations 11 and 12, base station 11, which is the upstream station, may be called an Integrated Access Backhaul (IAB) donor, and base station 12, which is the relay station, may be called an IAB node.

[0141] Base station 10 may be connected to the core network 30 via other base stations 10 or directly. The core network 30 may include at least one of the following: Evolved Packet Core (EPC), 5G Core Network (5GCN), Next Generation Core (NGC), etc.

[0142] The user terminal 20 may be a terminal that supports at least one of the following communication methods: LTE, LTE-A, 5G, etc.

[0143] In the wireless communication system 1, an orthogonal frequency division multiplexing (OFDM)-based wireless access scheme may be used. For example, Cyclic Prefix OFDM (CP-OFDM), Discrete Fourier Transform Spread OFDM (DFT-s-OFDM), Orthogonal Frequency Division Multiple Access (OFDMA), Single Carrier Frequency Division Multiple Access (SC-FDMA), etc., may be used in at least one of the downlink (DL) and uplink (UL).

[0144] The wireless access method may also be called a waveform. In wireless communication system 1, other wireless access methods (for example, other single-carrier transmission methods, other multi-carrier transmission methods) may be used for the UL and DL wireless access methods.

[0145] In the wireless communication system 1, a Physical Downlink Shared Channel (PDSCH), a Broadcast Channel (PBCH), or a Physical Downlink Control Channel (PDCCH) may be used as the downlink channel, shared by each user terminal 20.

[0146] Furthermore, in the wireless communication system 1, the uplink channel may include a Physical Uplink Shared Channel (PUSCH), a Physical Uplink Control Channel (PUCCH), a Physical Random Access Channel (PRACH), or the like, all of which are shared by each user terminal 20.

[0147] User data, higher-layer control information, and System Information Blocks (SIBs) are transmitted via PDSCH. User data and higher-layer control information may also be transmitted via PUSCH. Furthermore, Master Information Blocks (MIBs) may be transmitted via PBCH.

[0148] Lower-layer control information may be transmitted by PDCCH. The lower-layer control information may include, for example, Downlink Control Information (DCI) which includes scheduling information for at least one of PDSCH and PUSCH.

[0149] Furthermore, the DCI that schedules PDSCH may be called a DL assignment or DL ​​DCI, and the DCI that schedules PUSCH may be called a UL grant or UL DCI. Furthermore, PDSCH may be interpreted as DL data, and PUSCH may be interpreted as UL data.

[0150] PDCCH detection may utilize a Control Resource Set (CORESET) and a search space. A CORESET corresponds to the resources used to search for DCIs. A search space corresponds to the search area and search method for PDCCH candidates. A single CORESET may be associated with one or more search spaces. The UE may monitor CORESETs associated with a particular search space based on the search space configuration.

[0151] A single search space may correspond to one or more PDCCH candidates corresponding to aggregation levels. One or more search spaces may be referred to as a search space set. In this disclosure, "search space," "search space set," "search space configuration," "search space set configuration," "CORESET," and "CORESET configuration" may be interpreted interchangeably.

[0152] PUCCH may transmit uplink control information (UCI) which includes at least one of the following: channel state information (CSI), delivery acknowledgment (e.g., Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), ACK / NACK, etc.), and scheduling request (SR). PRACH may transmit a random access preamble for establishing a connection with the cell.

[0153] In this disclosure, downlinks, uplinks, etc., may be expressed without the prefix "link." Also, the prefix "physical" may be omitted when describing various channels.

[0154] In the wireless communication system 1, a synchronization signal (SS), a downlink reference signal (DL-RS), etc., may be transmitted. In the wireless communication system 1, as DL-RS, a cell-specific reference signal (CRS), a channel state information reference signal (CSI-RS), a demodulation reference signal (DMRS), a positioning reference signal (PRS), a phase tracking reference signal (PTRS), etc., may be transmitted.

[0155] The synchronization signal may be, for example, at least one of a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS). A signal block including SS (PSS, SSS) and PBCH (and DMRS for PBCH) may be called an SS / PBCH block, SS Block (SSB), etc. SS, SSB, etc., may also be called reference signals.

[0156] Furthermore, in the wireless communication system 1, the Uplink Reference Signal (UL-RS) may transmit the Sounding Reference Signal (SRS), Demodulation Reference Signal (DMRS), etc. The DMRS may also be called the User-Specific Reference Signal (UE-specific Reference Signal).

[0157] (base station) Figure 33 shows an example of the configuration of a base station according to one embodiment. The base station 10 includes a control unit 110, a transceiver unit 120, a transceiver antenna 130, and a transmission line interface 140. Note that one or more of the control unit 110, transceiver unit 120, transceiver antenna 130, and transmission line interface 140 may be provided.

[0158] In this example, the functional blocks of the characteristic parts of this embodiment are mainly shown, and it may be assumed that the base station 10 also has other functional blocks necessary for wireless communication. Some of the processing of each part described below may be omitted.

[0159] The control unit 110 controls the entire base station 10. The control unit 110 can consist of a controller, control circuit, etc., as described based on common understanding in the art relating to this disclosure.

[0160] The control unit 110 may control signal generation, scheduling (e.g., resource allocation, mapping), etc. The control unit 110 may also control transmission and reception, measurement, etc., using the transceiver unit 120, the transceiver antenna 130, and the transmission path interface 140. The control unit 110 may generate data to be transmitted as signals, control information, sequences, etc., and transfer them to the transceiver unit 120. The control unit 110 may also perform call processing of communication channels (setting, releasing, etc.), status management of the base station 10, management of radio resources, etc.

[0161] The transmitting / receiving unit 120 may include a baseband unit 121, a radio frequency (RF) unit 122, and a measurement unit 123. The baseband unit 121 may include a transmission processing unit 1211 and a reception processing unit 1212. The transmitting / receiving unit 120 can be composed of a transmitter / receiver, RF circuit, baseband circuit, filter, phase shifter, measurement circuit, transmitting / receiving circuit, etc., as described based on common understanding in the art relating to this disclosure.

[0162] The transmitting / receiving unit 120 may be configured as an integrated transmitting / receiving unit, or it may be composed of a transmitting unit and a receiving unit. The transmitting unit may consist of a transmitting processing unit 1211 and an RF unit 122. The receiving unit may consist of a receiving processing unit 1212, an RF unit 122 and a measuring unit 123.

[0163] The transmitting and receiving antenna 130 can be composed of an antenna described based on common understanding in the art relating to this disclosure, such as an array antenna.

[0164] The transmitting / receiving unit 120 may transmit the downlink channel, synchronization signal, downlink reference signal, etc. The transmitting / receiving unit 120 may also receive the uplink channel, uplink reference signal, etc.

[0165] The transmitting / receiving unit 120 may form at least one of the transmitting beam and the receiving beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), or the like.

[0166] The transmitting / receiving unit 120 (transmission processing unit 1211) may perform processing on data and control information acquired from the control unit 110, for example, at the Packet Data Convergence Protocol (PDCP) layer, the Radio Link Control (RLC) layer (e.g., RLC retransmission control), the Medium Access Control (MAC) layer (e.g., HARQ retransmission control), etc., to generate a bit sequence to be transmitted.

[0167] The transmitting / receiving unit 120 (transmission processing unit 1211) may perform transmission processing on the bit sequence to be transmitted, such as channel coding (which may include error correction coding), modulation, mapping, filtering, discrete Fourier transform (DFT) processing (if necessary), inverse fast Fourier transform (IFFT) processing, precoding, and digital-to-analog conversion, and output a baseband signal.

[0168] The transmitting / receiving unit 120 (RF unit 122) may perform modulation, filtering, amplification, etc., of the baseband signal to the radio frequency band and transmit the signal in the radio frequency band via the transmitting / receiving antenna 130.

[0169] On the other hand, the transmitting / receiving unit 120 (RF unit 122) may perform amplification, filtering, demodulation to a baseband signal, etc., on the radio frequency band signal received by the transmitting / receiving antenna 130.

[0170] The transmitting / receiving unit 120 (receiving processing unit 1212) may apply reception processing to the acquired baseband signal, such as analog-to-digital conversion, Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing (if necessary), filtering, demapping, demodulation, decoding (may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing, to acquire user data, etc.

[0171] The transmitting / receiving unit 120 (measurement unit 123) may perform measurements related to the received signal. For example, the measurement unit 123 may perform Radio Resource Management (RRM) measurements, Channel State Information (CSI) measurements, etc., based on the received signal. The measurement unit 123 may also measure received power (e.g., Reference Signal Received Power (RSRP)), reception quality (e.g., Reference Signal Received Quality (RSRQ), Signal to Interference plus Noise Ratio (SINR), Signal to Noise Ratio (SNR)), signal strength (e.g., Received Signal Strength Indicator (RSSI)), propagation path information (e.g., CSI), etc. The measurement results may be output to the control unit 110.

[0172] The transmission path interface 140 may send and receive signals (backhaul signaling) with devices included in the core network 30, other base stations 10, etc., and may acquire and transmit user data (user plane data), control plane data, etc. for the user terminal 20.

[0173] In this disclosure, the transmitting and receiving units of the base station 10 may consist of at least one of a transmitting / receiving unit 120, a transmitting / receiving antenna 130, and a transmission path interface 140.

[0174] The transmitting / receiving unit 120 may also transmit settings for multiple SRS resource sets, including one or more types of measurement reference signal (SRS) resource sets. The control unit 110 may control the reception of SRS transmitted using the antenna ports corresponding to the SRS resources in the multiple SRS resource sets, based on the settings corresponding to the resource set group including the multiple SRS resource sets.

[0175] The transmitting / receiving unit 120 may transmit a Medium Access Control Element (MAC CE) containing information indicating the activation or deactivation of each Sounding Reference Signal (SRS) resource. The control unit 110 may control the reception of the transmitted SRS based on the said information.

[0176] (User terminal) Figure 34 shows an example of the configuration of a user terminal according to one embodiment. The user terminal 20 includes a control unit 210, a transmitting / receiving unit 220, and a transmitting / receiving antenna 230. Note that one or more of the control unit 210, the transmitting / receiving unit 220, and the transmitting / receiving antenna 230 may be provided.

[0177] In this example, the functional blocks of the characteristic parts of this embodiment are mainly shown, and it may be assumed that the user terminal 20 also has other functional blocks necessary for wireless communication. Some of the processing of each part described below may be omitted.

[0178] The control unit 210 controls the entire user terminal 20. The control unit 210 can be composed of a controller, control circuit, etc., as described based on common understanding in the technical field related to this disclosure.

[0179] The control unit 210 may control signal generation, mapping, etc. The control unit 210 may also control transmission and reception, measurement, etc., using the transmitting / receiving unit 220 and the transmitting / receiving antenna 230. The control unit 210 may generate data to be transmitted as signals, control information, sequences, etc., and transfer them to the transmitting / receiving unit 220.

[0180] The transmitting / receiving unit 220 may include a baseband unit 221, an RF unit 222, and a measurement unit 223. The baseband unit 221 may include a transmission processing unit 2211 and a reception processing unit 2212. The transmitting / receiving unit 220 can be composed of a transmitter / receiver, RF circuit, baseband circuit, filter, phase shifter, measurement circuit, transmitting / receiving circuit, etc., as described based on common understanding in the art relating to this disclosure.

[0181] The transmitting / receiving unit 220 may be configured as an integrated transmitting / receiving unit, or it may be composed of a transmitting unit and a receiving unit. The transmitting unit may consist of a transmitting processing unit 2211 and an RF unit 222. The receiving unit may consist of a receiving processing unit 2212, an RF unit 222 and a measuring unit 223.

[0182] The transmitting and receiving antenna 230 can be composed of an antenna described based on common understanding in the art relating to this disclosure, such as an array antenna.

[0183] The transmitting / receiving unit 220 may receive the downlink channel, synchronization signal, downlink reference signal, etc. The transmitting / receiving unit 220 may also transmit the uplink channel, uplink reference signal, etc.

[0184] The transmitting / receiving unit 220 may form at least one of the transmitting beam and the receiving beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), or the like.

[0185] The transmitting / receiving unit 220 (transmission processing unit 2211) may perform PDCP layer processing, RLC layer processing (e.g., RLC retransmission control), MAC layer processing (e.g., HARQ retransmission control), etc., on data and control information acquired from the control unit 210, etc., to generate a bit sequence to be transmitted.

[0186] The transmitting / receiving unit 220 (transmission processing unit 2211) may perform transmission processing on the bit sequence to be transmitted, such as channel coding (which may include error correction coding), modulation, mapping, filtering, DFT processing (if necessary), IFFT processing, precoding, and digital-to-analog conversion, and output a baseband signal.

[0187] Whether or not to apply DFT processing may be based on the transform precoding settings. The transmitting / receiving unit 220 (transmission processing unit 2211) may perform DFT processing as part of the transmission process to transmit a channel (for example, PUSCH) using a DFT-s-OFDM waveform if transform precoding is enabled for that channel, or it may not perform DFT processing as part of the transmission process if transform precoding is not enabled for that channel.

[0188] The transmitting / receiving unit 220 (RF unit 222) may perform modulation, filtering, amplification, etc., of the baseband signal to the radio frequency band and transmit the signal in the radio frequency band via the transmitting / receiving antenna 230.

[0189] On the other hand, the transmitting / receiving unit 220 (RF unit 222) may perform amplification, filtering, demodulation to a baseband signal, etc., on the radio frequency band signal received by the transmitting / receiving antenna 230.

[0190] The transmitting / receiving unit 220 (receiving processing unit 2212) may apply reception processing such as analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filtering, demapping, demodulation, decoding (may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal to acquire user data, etc.

[0191] The transmitting / receiving unit 220 (measuring unit 223) may perform measurements related to the received signal. For example, the measuring unit 223 may perform RRM measurement, CSI measurement, etc., based on the received signal. The measuring unit 223 may also measure received power (e.g., RSRP), received quality (e.g., RSRQ, SINR, SNR), signal strength (e.g., RSSI), propagation path information (e.g., CSI), etc. The measurement results may be output to the control unit 210.

[0192] In this disclosure, the transmitting and receiving units of the user terminal 20 may consist of at least one of a transmitting / receiving unit 220 and a transmitting / receiving antenna 230.

[0193] The transmitting / receiving unit 220 may receive settings for multiple SRS resource sets, including one or more types of measurement reference signal (SRS) resource sets. The control unit 210 may control the transmission of SRS using antenna ports corresponding to SRS resources within the multiple SRS resource sets, based on the settings corresponding to resource set groups including the multiple SRS resource sets. The multiple SRS resource sets may include multiple types of SRS resource sets.

[0194] The transmitting / receiving unit 220 may receive information indicating at least one of the resource types and uses of the plurality of SRS resource sets. The control unit 210 may determine the resource set group including the plurality of SRS resource sets based on the information.

[0195] The transmitting / receiving unit 220 may receive information specifying the antenna port for each SRS resource. The control unit 210 may determine which antenna port to use for transmitting the SRS based on the information specifying the antenna port.

[0196] The transmitting / receiving unit 220 may receive a Medium Access Control Element (MAC CE) containing information indicating the activation or deactivation of each Sounding Reference Signal (SRS) resource. The control unit 210 may control the transmission of the SRS based on the information.

[0197] The MAC CE may further include spatial relationship information of the SRS resource to be activated. The MAC CE may further include information indicating the Transmission Configuration Indication state (TCI) state corresponding to the SRS resource to be activated. The MAC CE may further include information indicating activation or deactivation for each SRS resource set containing the SRS resource.

[0198] (Hardware configuration) The block diagrams used in the description of the above embodiments show functional units. These functional blocks (components) are realized by any combination of at least one of hardware and software. Furthermore, the method of realizing each functional block is not particularly limited. That is, each functional block may be realized using one device that is physically or logically coupled, or it may be realized using two or more physically or logically separated devices that are directly or indirectly connected (for example, using wired or wireless connections). A functional block may also be realized by combining the above one device or the above multiple devices with software.

[0199] Here, functions include, but are not limited to, judgment, decision, determination, calculation, calculation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, selection, establishment, comparison, assumption, expectation, consideration, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating (mapping), and assigning. For example, a functional block (configuration part) that enables transmission may be called a transmitting unit or transmitter. In all cases, as mentioned above, the method of implementation is not particularly limited.

[0200] For example, a base station, user terminal, etc. in one embodiment of the present disclosure may function as a computer that processes the wireless communication method of the present disclosure. Figure 35 is a diagram showing an example of the hardware configuration of a base station and user terminal according to one embodiment. The base station 10 and user terminal 20 described above may be physically configured as a computer device including a processor 1001, memory 1002, storage 1003, communication device 1004, input device 1005, output device 1006, bus 1007, etc.

[0201] In this disclosure, terms such as apparatus, circuit, device, section, and unit are interchangeable. The hardware configuration of the base station 10 and the user terminal 20 may include one or more of the devices shown in the figure, or it may be configured to omit some of the devices.

[0202] For example, although only one processor 1001 is shown in the diagram, there may be multiple processors. Furthermore, processing may be performed by one processor, or by two or more processors simultaneously, sequentially, or by other means. Note that processor 1001 may be implemented using one or more chips.

[0203] Each function in the base station 10 and the user terminal 20 is realized, for example, by loading predetermined software (programs) onto hardware such as the processor 1001 and memory 1002, which allows the processor 1001 to perform calculations and control communication via the communication device 1004, or to control at least one of the reading and writing of data in the memory 1002 and storage 1003.

[0204] The processor 1001 controls the entire computer, for example, by running an operating system. The processor 1001 may be composed of a central processing unit (CPU) that includes interfaces with peripheral devices, control units, arithmetic units, registers, etc. For example, at least a part of the control unit 110 (210) and the transmitting / receiving unit 120 (220) described above may be implemented by the processor 1001.

[0205] Furthermore, the processor 1001 reads programs (program code), software modules, data, etc., from at least one of the storage 1003 and the communication device 1004 into the memory 1002 and executes various processes accordingly. The program used is one that causes the computer to execute at least a part of the operations described in the above embodiment. For example, the control unit 110 (210) may be implemented by a control program stored in the memory 1002 and running on the processor 1001, and other functional blocks may be implemented similarly.

[0206] Memory 1002 is a computer-readable recording medium and may consist of at least one of the following: Read Only Memory (ROM), Erasable Programmable ROM (EPROM), Electrically EPROM (EEPROM), Random Access Memory (RAM), or other suitable storage medium. Memory 1002 may also be called a register, cache, or main memory. Memory 1002 can store executable programs (program code), software modules, etc., for carrying out a wireless communication method according to one embodiment of this disclosure.

[0207] Storage 1003 is a computer-readable recording medium and may consist of at least one of the following: a flexible disk, a floppy disk, a magneto-optical disk (e.g., a compact disk (Compact Disc ROM (CD-ROM)), a digital multipurpose disk, a Blu-ray disk), a removable disk, a hard disk drive, a smart card, a flash memory device (e.g., a card, stick, key drive), a magnetic stripe, a database, a server, or other suitable storage medium. Storage 1003 may also be called an auxiliary storage device.

[0208] The communication device 1004 is hardware (transmitting / receiving device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as a network device, network controller, network card, communication module, etc. The communication device 1004 may be configured to include, for example, a high-frequency switch, duplexer, filter, frequency synthesizer, etc., in order to implement at least one of frequency division duplex (FDD) and time division duplex (TDD). For example, the above-mentioned transmitting / receiving unit 120 (220), transmitting / receiving antenna 130 (230), etc., may be implemented by the communication device 1004. The transmitting / receiving unit 120 (220) may be implemented with physically or logically separated implementations of a transmitting unit 120a (220a) and a receiving unit 120b (220b).

[0209] The input device 1005 is an input device that accepts input from an external source (e.g., a keyboard, mouse, microphone, switch, button, sensor, etc.). The output device 1006 is an output device that outputs to an external source (e.g., a display, speaker, light-emitting diode (LED) lamp, etc.). The input device 1005 and the output device 1006 may be configured as an integrated unit (e.g., a touch panel).

[0210] Furthermore, each device, such as the processor 1001 and memory 1002, is connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or different buses may be configured for each device.

[0211] Furthermore, the base station 10 and the user terminal 20 may be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a programmable logic device (PLD), and a field programmable gate array (FPGA), and some or all of each functional block may be implemented using such hardware. For example, the processor 1001 may be implemented using at least one of these hardware components.

[0212] (modified version) In addition, terms used in this disclosure and terms necessary for understanding this disclosure may be replaced with terms having the same or similar meanings. For example, channel, symbol, and signal (signal or signaling) may be used interchangeably. Also, a signal may be a message. A reference signal may be abbreviated as RS and may be called a pilot, pilot signal, etc., depending on the applicable standard. Also, a component carrier (CC) may be called a cell, frequency carrier, carrier frequency, etc.

[0213] A wireless frame may consist of one or more periods (frames) in the time domain. Each of these periods (frames) constituting a wireless frame may be called a subframe. Furthermore, a subframe may consist of one or more slots in the time domain. A subframe may have a fixed time length (e.g., 1 ms) that is independent of numerology.

[0214] Here, the neuralelogy may be communication parameters applied to at least one of the transmission and reception of a signal or channel. The neuralelogy may be, for example, at least one of the following: subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame configuration, specific filtering processes performed by the transceiver in the frequency domain, or specific windowing processes performed by the transceiver in the time domain.

[0215] A slot may consist of one or more symbols in the time domain (such as Orthogonal Frequency Division Multiplexing (OFDM) symbols or Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols). Alternatively, a slot may be a time unit based on neurology.

[0216] A slot may include multiple mini-slots. Each mini-slot may consist of one or more symbols in the time domain. Mini-slots may also be called sub-slots. Mini-slots may consist of fewer symbols than a slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a mini-slot may be called a PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a mini-slot may be called a PDSCH (PUSCH) mapping type B.

[0217] Wireless frames, subframes, slots, minislots, and symbols all represent units of time when transmitting a signal. Wireless frames, subframes, slots, minislots, and symbols may each be referred to by different names. Furthermore, the units of time such as frames, subframes, slots, minislots, and symbols in this disclosure may be interpreted as interchangeable.

[0218] For example, one subframe may be called TTI, multiple consecutive subframes may be called TTI, or one slot or one mini-slot may be called TTI. In other words, at least one of the subframe and TTI may be a subframe (1ms) in existing LTE, a period shorter than 1ms (e.g., 1-13 symbols), or a period longer than 1ms. Note that the unit representing TTI may be called a slot, mini-slot, etc., instead of a subframe.

[0219] Here, TTI refers to, for example, the smallest unit of time for scheduling in wireless communication. For example, in an LTE system, the base station schedules each user terminal to allocate wireless resources (such as the frequency bandwidth and transmission power available to each user terminal) in TTI units. However, the definition of TTI is not limited to this.

[0220] TTI may be a transmission time unit for channel-encoded data packets (transport blocks), code blocks, code words, etc., or it may be a processing unit for scheduling, link adaptation, etc. Given a TTI, the actual time interval (e.g., number of symbols) to which the transport block, code block, code word, etc. are mapped may be shorter than the given TTI.

[0221] Furthermore, if one slot or one mini-slot is referred to as TTI, then one or more TTIs (i.e., one or more slots or one or more mini-slots) may constitute the minimum time unit of scheduling. In addition, the number of slots (number of mini-slots) that constitute the minimum time unit of scheduling may be controlled.

[0222] A TTI with a time length of 1 ms may also be called a normal TTI (TTI in 3GPP Rel.8-12), a long TTI, a normal subframe, a long subframe, or a slot. A TTI shorter than a normal TTI may also be called a shortened TTI, a short TTI, a partial or fractional TTI, a shortened subframe, a short subframe, a mini slot, a sub slot, or a slot.

[0223] Furthermore, long TTIs (e.g., normal TTIs, subframes, etc.) may be interpreted as TTIs with a time length exceeding 1 ms, and short TTIs (e.g., shortened TTIs, etc.) may be interpreted as TTIs with a TTI length less than that of a long TTI but 1 ms or more.

[0224] A Resource Block (RB) is a resource allocation unit in the time domain and frequency domain, and in the frequency domain, it may contain one or more consecutive subcarriers. The number of subcarriers in an RB may be the same regardless of the neurology, for example, 12. The number of subcarriers in an RB may be determined based on the neurology.

[0225] Furthermore, an RB may contain one or more symbols in the time domain and may have the length of one slot, one minislot, one subframe, or one TTI. Each TTI, subframe, etc., may consist of one or more resource blocks.

[0226] One or more RBs may also be called Physical RBs (PRBs), Sub-Carrier Groups (SCGs), Resource Element Groups (REGs), PRB pairs, RB pairs, etc.

[0227] Furthermore, a resource block may consist of one or more resource elements (REs). For example, one RE may be a radio resource area comprising one subcarrier and one symbol.

[0228] A Bandwidth Part (BWP) (also called a partial bandwidth) may represent a subset of consecutive common resource blocks (RBs) for a given neurology in a given carrier. Here, the common RBs may be identified by an index of the RBs relative to the carrier's common reference point. PRBs may be defined and numbered within a BWP.

[0229] A BWP may include UL BWPs (BWPs for UL) and DL BWPs (BWPs for DL). One or more BWPs may be configured within a single carrier for a UE.

[0230] At least one of the configured BWPs may be active, and the UE does not need to assume that it will send or receive a given signal / channel outside of the active BWP. In this disclosure, terms such as "cell" and "carrier" may be read as "BWP".

[0231] The structures described above, such as wireless frames, subframes, slots, minislots, and symbols, are merely illustrative examples. For instance, the number of subframes included in a wireless frame, the number of slots per subframe or wireless frame, the number of minislots within a slot, the number of symbols and RBs included in a slot or minislot, the number of subcarriers included in an RB, and the number of symbols, symbol length, and cyclic prefix (CP) length within a TTI can be varied in various ways.

[0232] Furthermore, the information, parameters, etc., described in this disclosure may be expressed using absolute values, relative values ​​from a predetermined value, or corresponding other information. For example, wireless resources may be indicated by a predetermined index.

[0233] The names used for parameters and other elements in this disclosure are not restrictive in any way. Furthermore, mathematical formulas and other elements that use these parameters may differ from those expressly disclosed in this disclosure. Various channels (PUCCH, PDCCH, etc.) and information elements can be identified by any suitable name, and therefore, the various names assigned to these various channels and information elements are not restrictive in any way.

[0234] The information, signals, etc. described in this disclosure may be represented using any of the various different techniques. For example, the data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0235] Furthermore, information, signals, etc., can be output from upper layers to lower layers and from lower layers to upper layers, or to at least one of the two. Information, signals, etc., may also be input and output via multiple network nodes.

[0236] Input and output information and signals may be stored in a specific location (e.g., memory) or managed using a management table. Input and output information and signals may be overwritten, updated, or appended to. Output information and signals may be deleted. Input information and signals may be transmitted to other devices.

[0237] Information notification is not limited to the embodiments described herein and may be carried out by other means. For example, information notification in this disclosure may be carried out 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)), Medium Access Control (MAC) signaling), other signals, or a combination thereof).

[0238] Physical layer signaling may also be called Layer 1 / Layer 2 (L1 / L2) control information (L1 / L2 control signals), L1 control information (L1 control signals), etc. RRC signaling may also be called RRC messages, for example, RRC Connection Setup messages, RRC Connection Reconfiguration messages, etc. MAC signaling may also be communicated using, for example, MAC Control Element (CE).

[0239] Furthermore, notification of the specified information (for example, notification that "X is the case") is not limited to explicit notification, but may also be made implicitly (for example, by not notifying the specified information or by notifying other information).

[0240] The determination may be made by a value represented by 1 bit (0 or 1), by a boolean value represented as true or false, or by a numerical comparison (for example, a comparison with a predetermined value).

[0241] Software should be broadly interpreted to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, functions, and so on, whether they are called software, firmware, middleware, microcode, hardware description languages, or by any other name.

[0242] Furthermore, software, instructions, information, etc., may be transmitted and received via a transmission medium. For example, if software is transmitted from a website, server, or other remote source using at least one of wired technology (such as coaxial cable, fiber optic cable, twisted pair, or Digital Subscriber Line (DSL)) and wireless technology (such as infrared or microwave), then at least one of these wired and wireless technologies is included in the definition of a transmission medium.

[0243] The terms “system” and “network” as used in this disclosure may be used interchangeably. “Network” may also mean the equipment included in the network (e.g., base stations).

[0244] In this disclosure, terms such as "precoding," "precoder," "weight (precoding weight)," "quasi-co-location (QCL)," "transmission configuration indication state (TCI state)," "spatial relation," "spatial domain filter," "transmit power," "phase rotation," "antenna port," "antenna port group," "layer," "number of layers," "rank," "resource," "resource set," "resource group," "beam," "beam width," "beam angle," "antenna," "antenna element," and "panel" may be used interchangeably.

[0245] In this disclosure, terms such as "Base Station (BS)", "wireless base station", "fixed station", "NodeB", "eNB (eNodeB)", "gNB (gNodeB)", "access point", "Transmission Point (TP)", "Reception Point (RP)", "Transmission / Reception Point (TRP)", "panel", "cell", "sector", "cell group", "carrier", and "component carrier" may be used interchangeably. Base stations may also be referred to by terms such as macrocell, small cell, femtocell, and picocell.

[0246] A base station can house one or more (e.g., three) cells. If a base station houses multiple cells, the entire coverage area of ​​the base station can be divided into several smaller areas, each of which may also be provided with communication services by a base station subsystem (e.g., a small indoor base station (Remote Radio Head (RRH))). The terms “cell” or “sector” refer to part or all of the coverage area of ​​at least one of the base station and / or base station subsystems that provide communication services in that coverage.

[0247] In this disclosure, terms such as "Mobile Station (MS)," "user terminal," "User Equipment (UE)," and "terminal" may be used interchangeably.

[0248] A mobile station may also be called a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, or some other appropriate term.

[0249] At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a wireless communication device, etc. At least one of the base station and the mobile station may also be a device mounted on a moving object, the moving object itself, etc.

[0250] The term "mobile object" refers to any movable object, regardless of its speed, and naturally includes cases where the mobile object is stationary. Examples of such mobile objects include, but are not limited to, vehicles, transport vehicles, automobiles, motorcycles, bicycles, connected cars, excavators, bulldozers, wheel loaders, dump trucks, forklifts, trains, buses, handcarts, rickshaws, ships and other watercraft, airplanes, rockets, satellites, drones, multicopters, quadcopters, balloons, and items carried on them. Furthermore, such mobile objects may be autonomously driven objects operating based on operational commands.

[0251] The mobile entity may be a vehicle (e.g., a car, an airplane), an unmanned mobile entity (e.g., a drone, an autonomous vehicle), or a robot (manned or unmanned). At least one of the base station and the mobile station may be a device that does not necessarily move during communication operations. 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.

[0252] Figure 36 shows an example of a vehicle according to one embodiment. The vehicle 40 includes a drive unit 41, a steering unit 42, an accelerator pedal 43, a brake pedal 44, a shift lever 45, left and right front wheels 46, left and right rear wheels 47, an axle 48, an electronic control unit 49, various sensors (including a current sensor 50, a rotation speed sensor 51, a pneumatic pressure sensor 52, a vehicle speed sensor 53, an acceleration sensor 54, an accelerator pedal sensor 55, a brake pedal sensor 56, a shift lever sensor 57, and an object detection sensor 58), an information service unit 59, and a communication module 60.

[0253] The drive unit 41 is composed of, for example, at least one of an engine, a motor, and a hybrid of an engine and a motor. The steering unit 42 includes at least a steering wheel (also called a handle), and is configured to steer at least one of the front wheels 46 and the rear wheels 47 based on the operation of the steering wheel operated by the user.

[0254] The electronic control unit 49 is composed of a microprocessor 61, a memory (ROM, RAM) 62, and a communication port (for example, an input / output (Input / Output (IO)) port) 63. Signals from various sensors 50 - 58 provided in the vehicle are input to the electronic control unit 49. The electronic control unit 49 may be called an Electronic Control Unit (ECU).

[0255] Signals from the various sensors 50 - 58 include a current signal from a current sensor 50 that senses the current of the motor, a rotation speed signal of the front wheels 46 / rear wheels 47 acquired by a rotation speed sensor 51, an air pressure signal of the front wheels 46 / rear wheels 47 acquired by an air pressure sensor 52, a vehicle speed signal acquired by a vehicle speed sensor 53, an acceleration signal acquired by an acceleration sensor 54, a depression amount signal of an accelerator pedal 43 acquired by an accelerator pedal sensor 55, a depression amount signal of a brake pedal 44 acquired by a brake pedal sensor 56, an operation signal of a shift lever 45 acquired by a shift lever sensor 57, a detection signal for detecting obstacles, vehicles, pedestrians, etc. acquired by an object detection sensor 58, and the like.

[0256] The information service unit 59 is composed of various devices for providing (outputting) various information such as driving information, traffic information, and entertainment information, such as a car navigation system, an audio system, a speaker, a display, a television, a radio, and one or more ECUs for controlling these devices. The information service unit 59 uses information acquired from an external device via a communication module 60 and the like to provide various information / services (for example, multimedia information / multimedia services) to the passengers of the vehicle 40.

[0257] The information service unit 59 may include an input device (e.g., keyboard, mouse, microphone, switch, button, sensor, touch panel, etc.) for receiving external input, or may include an output device (e.g., display, speaker, LED lamp, touch panel, etc.) for performing external output.

[0258] The driving assistance system unit 64 is composed of various devices for providing functions to prevent accidents and reduce the driver's driving load, such as millimeter-wave radar, Light Detection and Ranging (LiDAR), camera, positioning locator (e.g., Global Navigation Satellite System (GNSS), etc.), map information (e.g., High Definition (HD) map, Autonomous Vehicle (AV) map, etc.), gyro system (e.g., Inertial Measurement Unit (IMU), Inertial Navigation System (INS), etc.), Artificial Intelligence (AI) chip, AI processor, etc., and one or more ECUs for controlling these devices. Also, the driving assistance system unit 64 transmits and receives various information via the communication module 60 to realize a driving assistance function or an autonomous driving function.

[0259] The communication module 60 can communicate with the microprocessor 61 and the components of the vehicle 40 via the communication port 63. For example, the communication module 60 transmits and receives data (information) with the drive unit 41, steering unit 42, accelerator pedal 43, brake pedal 44, shift lever 45, left and right front wheels 46, left and right rear wheels 47, axle 48, microprocessor 61 and memory (ROM, RAM) 62 in the electronic control unit 49, and various sensors 50 - 58 in the vehicle 40 via the communication port 63.

[0260] The communication module 60 is a communication device that can be controlled by the microprocessor 61 of the electronic control unit 49 and can communicate with external devices. For example, it can send and receive various types of information to and from external devices via wireless communication. The communication module 60 may be located either inside or outside the electronic control unit 49. The external device may be, for example, the base station 10 or the user terminal 20 described above. Alternatively, the communication module 60 may be, for example, at least one of the base station 10 and the user terminal 20 (it may function as at least one of the base station 10 and the user terminal 20).

[0261] The communication module 60 may transmit at least one of the following to an external device via wireless communication: signals from the various sensors 50-58 input to the electronic control unit 49, information obtained based on said signals, and information based on input from an external source (user) obtained via the information service unit 59. The electronic control unit 49, the various sensors 50-58, the information service unit 59, etc., may also be called input units that accept input. For example, the PUSCH transmitted by the communication module 60 may include information based on the above input.

[0262] The communication module 60 receives various information (traffic information, signal information, inter-vehicle information, etc.) transmitted from an external device and displays it on the information service unit 59 installed in the vehicle. The information service unit 59 may also be called an output unit, which outputs information (for example, it outputs information to devices such as displays and speakers based on the PDSCH (or data / information decoded from the PDSCH) received by the communication module 60).

[0263] Furthermore, the communication module 60 stores various information received from external devices in a memory 62 that can be used by the microprocessor 61. Based on the information stored in the memory 62, the microprocessor 61 may control the drive unit 41, steering unit 42, accelerator pedal 43, brake pedal 44, shift lever 45, left and right front wheels 46, left and right rear wheels 47, axle 48, various sensors 50-58, etc., which are provided in the vehicle 40.

[0264] Furthermore, the term "base station" in this disclosure may be interpreted as "user terminal." For example, the various aspects / embodiments of this disclosure may be applied to a configuration in which communication between a base station and a user terminal is replaced with communication between multiple user terminals (which may be called, for example, Device-to-Device (D2D), Vehicle-to-Everything (V2X)). In this case, the user terminal 20 may have the functions that the base station 10 has. Also, terms such as "uplink" and "downlink" may be interpreted as terms corresponding to terminal-to-terminal communication (for example, "sidelink"). For example, uplink channel and downlink channel may be interpreted as sidelink channel.

[0265] Similarly, the term "user terminal" in this disclosure may be replaced with "base station." In this case, the base station 10 may be configured to have the same functions as the user terminal 20 described above.

[0266] In this disclosure, operations performed by a base station may, in some cases, be performed by its upper node. In a network including one or more network nodes with base stations, it is clear that various operations performed for communication with terminals may be performed by the base station, one or more network nodes other than the base station (for example, a Mobility Management Entity (MME), a Serving Gateway (S-GW), etc., but not limited to these), or a combination thereof.

[0267] Each aspect / embodiment described in this disclosure may be used individually, in combination, or switched between during execution. Furthermore, the processing procedures, sequences, flowcharts, etc., of each aspect / embodiment described in this disclosure may be rearranged in order, provided they are consistent. For example, the methods described in this disclosure present various step elements in an exemplary order and are not limited to that specific order.

[0268] Each aspect / embodiment described in this disclosure includes Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), 6th generation mobile communication system (6G), xth generation mobile communication system (xG (where x is, for example, an integer or decimal)), Future Radio Access (FRA), New-Radio Access Technology (RAT), New Radio (NR), New radio access (NX), Future generation radio access (FX), Global System for Mobile communications (GSM®), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi®), IEEE 802.16 (WiMAX®), and IEEE This may apply to systems utilizing 802.20, Ultra-WideBand (UWB), Bluetooth®, or other appropriate wireless communication methods, as well as next-generation systems that are extended, modified, created, or defined based on these. It may also apply to combinations of multiple systems (e.g., a combination of LTE or LTE-A and 5G).

[0269] In this disclosure, the phrase "based on" does not mean "based solely on" unless otherwise specified. In other words, the phrase "based on" means both "based solely on" and "based at least on."

[0270] Any reference to elements using the designations “first,” “second,” etc., as used in this disclosure does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient way to distinguish between two or more elements. Accordingly, the references to the first and second elements do not imply that only two elements may be employed or that the first element must precede the second element in any way.

[0271] The term “determining” as used in this disclosure may encompass a wide variety of actions. For example, “determining” may be considered to include judging, calculating, computing, processing, deriving, investigating, looking up, searching, inquiry (e.g., searching in tables, databases, or other data structures), ascertaining, etc.

[0272] Furthermore, "judgment (decision)" may be considered as "judging (deciding)" things like receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, accessing (e.g., accessing data in memory).

[0273] Furthermore, "judgment (decision)" can be considered as "judging (deciding)" something like resolving, selecting, choosing, establishing, comparing, etc. In other words, "judgment (decision)" can be considered as "judging (deciding)" something about an action.

[0274] Furthermore, "judgment (decision)" can be replaced with "assuming," "expecting," or "considering."

[0275] As used in this disclosure, the terms “connected,” “coupled,” and any variations thereof mean any direct or indirect connection or coupling between two or more elements, and may include one or more intermediate elements between two elements that are “connected” or “coupled” with each other. The coupling or connection between elements may be physical, logical, or a combination thereof. For example, “connection” may be replaced with “access.”

[0276] In this disclosure, when two elements are connected, they can be considered to be “connected” or “coupled” to each other using one or more wires, cables, printed electrical connections, etc., and, in some non-exclusive and non-exclusive examples, electromagnetic energy having wavelengths in the radio frequency domain, microwave domain, or optical domain (both visible and invisible).

[0277] In this disclosure, the term "A and B are different" may mean "A and B are different from each other." The term may also mean "A and B are each different from C." Terms such as "separate" and "combine" may be interpreted similarly to "different."

[0278] In the present disclosure, when terms such as "include", "including" and their variants are used, these terms are intended to be inclusive, similar to the term "comprising". Further, the term "or" used in the present disclosure is not intended to be an exclusive disjunction.

[0279] In the present disclosure, for example, when articles are added by translation, such as a, an and the in English, the present disclosure may include that the nouns following these articles are in the plural form.

[0280] As described above, the invention according to the present disclosure has been described in detail. However, it is clear to those skilled in the art that the invention according to the present disclosure is not limited to the embodiments described in the present disclosure. The invention according to the present disclosure can be implemented in modified and changed forms without departing from the spirit and scope of the invention determined based on the description of the claims. Therefore, the description of the present disclosure is for the purpose of illustrative explanation and does not bring any restrictive meaning to the invention according to the present disclosure.

Claims

1. A receiving unit that receives a single Medium Access Control Control Element (MAC CE) which includes first information indicating the activation or deactivation of each Sounding Reference Signal (SRS) resource whose purpose is antenna switching, and second information indicating the activation or deactivation of each SRS resource set including the SRS resource, The system includes a control unit that controls the transmission of SRS based on the first information corresponding to the second information, The first information is a bitmap in which each bit corresponds to the SRS resource, and one bit in the bitmap indicates the activation or deactivation of one of the SRS resources in the SRS resource set in the second information. Terminal.

2. The aforementioned MAC CE further includes spatial relational information of the SRS resource to be activated. The terminal according to claim 1.

3. The aforementioned MAC CE further includes information indicating the Transmission Configuration Indication (TCI) state corresponding to the SRS resource to be activated. The terminal according to claim 1.

4. A step of receiving a Medium Access Control Control Element (MAC CE) which includes first information indicating activation or deactivation for each Sounding Reference Signal (SRS) resource whose purpose is antenna switching, and second information indicating activation or deactivation for each SRS resource set including the SRS resource, The process includes a step of controlling the transmission of SRS based on the first information corresponding to the second information, The first information is a bitmap in which each bit corresponds to the SRS resource, and one bit in the bitmap indicates the activation or deactivation of one of the SRS resources in the SRS resource set in the second information. The wireless communication method used by the terminal.

5. A transmitting unit that transmits a single Medium Access Control Control Element (MAC CE) which includes first information indicating the activation or deactivation of each Sounding Reference Signal (SRS) resource whose purpose is antenna switching, and second information indicating the activation or deactivation of each SRS resource set including the SRS resource, The system includes a control unit that controls the reception of an SRS transmitted based on the first information corresponding to the second information, The first information is a bitmap in which each bit corresponds to the SRS resource, and one bit in the bitmap indicates the activation or deactivation of one of the SRS resources in the SRS resource set in the second information. Base station.

Images