Terminals, wireless communication methods, base stations and systems

Abstract

A terminal according to one aspect of the present disclosure is characterized by comprising: a reception unit for receiving an upper-layer parameter indicating antenna switching as a usage of a sounding reference signal (SRS) resource set; and a control unit for applying six or more SRS ports and six or more antenna ports in accordance with terminal capability information concerning the antenna switching. 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 and a wireless communication method in a next-generation mobile communication system. Laws, base stations and systems It relates to.

Background Art

[0002] In a Universal Mobile Telecommunications System (UMTS) network, Long Term Evolution (LTE) was standardized for the purpose of further high-speed 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 standardized.

[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, this disclosure relates to a terminal and wireless communication method that can appropriately control SRS transmission when antenna switching is set as the application of SRS. law, basis earth Stations and systems One of the purposes is to provide it. [Means for solving the problem]

[0008] A terminal according to one aspect of this disclosure includes a receiving unit that receives upper-layer parameters indicating antenna switching as an application of a Sounding Reference Signal (SRS) resource set, and a control unit that controls the transmission of SRS using the eight SRS ports and the eight receiving ports according to terminal capability information supporting the eight SRS ports and eight receiving ports for antenna switching. The control unit controls the transmission of the SRS within up to two SRS resource sets with the resource type set to semi-persistent and up to one SRS resource set with the resource type set to periodic, and does not assume that two SRS resource sets with the resource type set to semi-persistent will not be activated simultaneously, and that more than one SRS resource set will be configured for the antenna switching for the use indicated by the upper layer parameters. It is characterized by the following. [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] This figure shows an example of the correspondence between SRS resources and antenna ports in the case of 4T8R in Rel.16. [Figure 13]FIG. 13 is a diagram showing a guard period between two SRS resources when the application is antenna switching in Rel. 15 and 16. [Figure 14] FIGS. 14A to 14C are diagrams showing examples of SRS transmission in 1T2R. [Figure 15] FIGS. 15A to 15C are diagrams showing examples of SRS transmission in 2T4R. [Figure 16] FIG. 16 is a diagram showing an example of Option 1 of Embodiment 1-1. [Figure 17] FIG. 17 is a diagram showing an example of Option 2 of Embodiment 1-1. [Figure 18] FIG. 18 is a diagram showing an example of Option 3 of Embodiment 1-1. [Figure 19] FIG. 19 is a diagram showing an example of Option 5 of Embodiment 1-1. [Figure 20] FIG. 20 is a diagram showing an example of Option 6 of Embodiment 1-1. [Figure 21] FIG. 21 is a diagram showing examples of Option 1 and Option A of Embodiment 1-2. [Figure 22] FIG. 22 is a diagram showing a first example of Option 2 and Option B of Embodiment 1-2. [Figure 23] FIG. 23 is a diagram showing a second example of Option 2 and Option B of Embodiment 1-2. [Figure 24] FIG. 24 is a diagram showing examples of Option 6 and Option A of Embodiment 1-2. [Figure 25] FIG. 25 is a diagram showing an example of a schematic configuration of a wireless communication system according to an embodiment. [Figure 26] FIG. 26 is a diagram showing an example of a configuration of a base station according to an embodiment. [Figure 27] FIG. 27 is a diagram showing an example of a configuration of a user terminal according to an embodiment. [Figure 28] FIG. 28 is a diagram showing an example of a hardware configuration of a base station and a user terminal according to an embodiment. [Figure 29]Figure 29 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 the capabilities of 1T1R, 2T4R, and 1T4R do not expect to set or trigger more than one SRS resource set 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 to set or trigger more than one SRS resource set in the same symbol.

[0037] <Specific examples of configurations applying antenna switching in Rel.15, 16> For example, when the number of transmission ports of the UE is less than or equal to the number of reception ports, UE measurements for DL CSI acquisition are used and the purpose of SRS is set to "antenna switching". In Rel.15, 16, 1T1R, 2T2R, 4T4R, 1T2R, 2T4R, and 1T4R are supported. Hereinafter, 1T2R, 2T4R, and 1T4R in Rel.16 will be described.

[0038] In the case of 1T2R, up to two SRS resource sets (P / SP / AP) with different time-domain operations are set. Each resource set contains two SRS resources in different symbols. In the example of FIG. 1, one SRS resource set has two SRS resources and each SRS resource has a single SRS port. The SRS port of the first resource in the SRS resource set is associated with a different UE antenna port from the SRS port of the second resource in the same set.

[0039] In the case of 2T4R, up to two SRS resource sets (P / SP / AP) with different time-domain operations are configured. Each resource set contains two SRS resources with different symbols. In the example in Figure 2, one SRS resource set has two SRS resources, and each SRS resource has two SRS ports (which may also be called port pairs). 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,#1 are a pair, and UE antenna ports #2,#3 are a pair.

[0040] In the case of 1T4R, zero or one SRS resource set (P / SP) is configured. Each resource set contains four SRS resources with different symbols. In the example in Figure 3, one P / SP SRS resource set has four SRS resources, and each SRS resource has a single SRS port. Each SRS port of each SRS resource is associated with a different UE antenna port.

[0041] In the case of 1T4R, zero or two SRS resource sets (APs) are configured. Each resource set contains a total of four SRS resources in two slots with different symbols. In the example in Figures 4 and 5, two AP SRS resource sets have a total of four SRS resources. Each SRS resource has one SRS port. The SRS ports of each SRS resource in the two resource sets are associated with different UE antenna ports.

[0042] In the example in Figure 4, the two resource sets each have two SRS resources. In the example in Figure 5, one of the two resource sets has one SRS resource, and the other resource set has three SRS resources.

[0043] In the case of 1T1R, 2T2R, and 4T4R configurations, a maximum of two SRS resource sets can be configured. Each resource set has one SRS resource. The number of SRS ports for each SRS resource can be 1, 2, or 4.

[0044] <Specific examples of new settings that apply antenna switching> Rel.17 is also considering supporting 1T6R, 1T8R, 2T6R, 2T8R, and 4T8R.

[0045] 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 an SRS resource set is associated with a different UE antenna port.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] In the case of 2T6R, one P / SP 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.

[0050] 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.

[0051] 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 an 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.

[0052] <Guard period> A guard period for Y symbols is set between SRS resources in an SRS resource set. The UE does not transmit any other signals while transmitting an SRS from an SRS resource set within the same slot.

[0053] When 1T2R, 1T4R, 2T4R, or 1T6R, 1T8R, 2T6R, 2T8R, or 4T8R is applied, the UE does not expect multiple SRS resource sets with the upper layer parameter usage set to "antennaSwitching" to be set or triggered within the same slot. When 1T=1R, 2T=2R, or 4T=4R is applied, the UE does not expect multiple SRS resource sets with the upper layer parameter usage set to "antennaSwitching" to be set or triggered within the same symbol.

[0054] Figure 13 shows the guard period between two SRS resources when the application is antenna switching, as shown in Rel. 15 and 16. Figure 13 shows the relationship between the subcarrier interval and the guard period (number of symbols).

[0055] Figure 14A shows the relationship between SRS ports and UE antenna ports in 1T2R. In Figure 14A, SRS port 0 of the first SRS resource is associated with UE antenna port 0, and SRS port 0 of the second SRS resource is associated with UE antenna port 1.

[0056] Figure 14B shows the resource grid for each SRS port in 1T2R. As shown in Figure 14B, SRS port 0 is used for SRS transmission in resource 0 (symbol l0) and resource 1 (symbol l2). In this case, SRS port 1 is not used. The period between symbol l0 and symbol l2 is a guard period.

[0057] Figure 14C shows the transmission status of the UE antenna ports in 1T2R. As shown in Figure 14C, the UE transmits SRS using UE antenna port 0 (Antenna 0) at symbol l0, and transmits SRS using UE antenna port 1 (Antenna 1) at symbol l2. In other words, the UE switches the antenna port used to transmit SRS from UE antenna port 0 to UE antenna port 1 after the guard period.

[0058] Figure 15A shows the relationship between SRS ports and UE antenna ports in 2T4R. In Figure 15A, SRS port 0 of the first SRS resource is associated with UE antenna port 0, and SRS port 1 of the first SRS resource is associated with UE antenna port 1. In addition, SRS port 0 of the second SRS resource is associated with UE antenna port 2, and SRS port 1 of the second SRS resource is associated with UE antenna port 3.

[0059] Figure 15B shows the resource grid for each SRS port in 2T4R. As shown in Figure 15B, SRS port 0 is used for SRS transmission in resource 0 (symbol l0) and resource 1 (symbol l2). The same applies to SRS port 1. The period between symbol l0 and symbol l2 is a guard period.

[0060] Figure 15C shows the transmission status of the UE antenna ports in 2T4R. As shown in Figure 15C, the UE transmits SRS using UE antenna port 0 (Antenna 0) and UE antenna port 1 (Antenna 1) at symbol l0, and transmits SRS using UE antenna port 2 (Antenna 2) and UE antenna port 3 (Antenna 3) at symbol l2. In other words, the UE switches the antenna ports used to transmit SRS from UE antenna ports 0 and 1 to UE antenna ports 2 and 3 after the guard period.

[0061] (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.

[0062] For example, future wireless communication systems (Rel.18) may apply to at least one of the six transmit ports (6T) or eight transmit ports (8T) of the SRS. However, it is unclear whether, and how, SRS configurations for antenna switching will be supported when 6T / 8T is applied. For example, the UE might support up to six layers for UL when 6T is applied, and up to eight layers for UL when 8T is applied.

[0063] Therefore, the inventors conceived of a terminal that can receive appropriate settings when antenna switching is configured as an application for SRS.

[0064] 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.

[0065] 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".

[0066] 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.

[0067] 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.

[0068] 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.

[0069] 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).

[0070] In this disclosure, physical layer signaling may include, for example, Downlink Control Information (DCI) and Uplink Control Information (UCI).

[0071] 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.

[0072] 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.

[0073] 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 pieces of spatial relationship information," etc. TCI state and TCI may be interpreted as mutually exclusive.

[0074] 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.

[0075] 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.

[0076] In this disclosure, the application of xTyR, the transmission (reporting) of "txry" in UE capability information (e.g., supportedSRS-TxPortSwitch), and the setting of xTyR in upper layer signaling / physical layer signaling may be interpreted interchangeably. In this disclosure, UL transmissions with a number of layers greater than 4 may be applied. The processing in this disclosure may be applied to UEs that support a number of layers greater than 4.

[0077] In this disclosure, the terms SRS port, transmit port, and SRS transmit port may be interpreted interchangeably. In this disclosure, the terms receive port, antenna port, and UE antenna port may be interpreted interchangeably.

[0078] (Wireless communication method) If a higher-layer parameter indicating antenna switching as the usage of an SRS resource set is received and this usage is set, the UE may support / apply six or more SRS transmit ports and six or more antenna ports (e.g., at least one of 6T6R, 6T8R, 8T8R) according to terminal (UE) capability information regarding antenna switching (e.g., "supportedSRS-TxPortSwitch"). Note that each process in this disclosure may assume that antenna switching is set as the usage of an SRS resource set (i.e., a higher-layer parameter indicating antenna switching as the usage of an SRS resource set has been received).

[0079] The UE may transmit (report) at least one of the following as UE capability information regarding antenna switching (e.g., supportedSRS-TxPortSwitch): 't6r8' for 6T8R, 't8r8' for 8T8R, 't6r6-t6r8' for 6T=6R / 6T8R, 't6r8-t8r8' for 6T8R / 8T8R, and 't6r6-t8r8' for 6T=6R / 8T=8R. At least one of 6T8R, 6T6R, or 6T8R may not be supported.

[0080] UE capabilities may be supported for combinations of the above new antenna switching (6T6R, 6T8R, 8T8R) with existing xTyR. As UE capabilities, at least two combinations of {t1r1, t1r2, t1r4, t1r6, t1r8, t2r2, t2r4, t2r6, t2r8, t4r4, t4r8, t6r6, t6r8, t8r8}, including the new antenna switching and existing xTyR, may be supported.

[0081] <Embodiment 1-1> Embodiment 1-1 describes an SRS resource set in which six or more SRS ports and eight or more antenna ports (e.g., 6T8R) are applied, and the resource type of the corresponding RRC parameter "SRS-ResourceSet" is set to "periodic" or "semi-persistent". The UE controls the transmission of SRS within the SRS resource set using six or more SRS ports and eight or more antenna ports (e.g., 6T8R).

[0082] [Aspect 1-1-1] When 6T8R is applied, the UE may be configured with "periodic" as the resource type in the SRS resource set via upper-layer signaling, and may have zero or one SRS resource set. In this case, one of the following options may apply:

[0083] [[Option 1]] One resource set has two SRS resources that are transmitted in different symbols. Each SRS resource has four SRS ports (Figure 16).

[0084] [[Option 2]] One resource set has four SRS resources that are transmitted in different symbols. Each SRS resource has two SRS ports (Figure 17).

[0085] [[Option 3]] A single resource set has three SRS resources transmitted in different symbols. One SRS resource has four SRS ports, and the other two SRS resources each have two SRS ports (Figure 18).

[0086] [[Option 4]] One resource set has three SRS resources that are transmitted in different symbols. Each SRS resource has four SRS ports.

[0087] [[Option 5]] One resource set has four SRS resources transmitted in different symbols, and each SRS resource has four SRS ports (Figure 19). As shown in the example in Figure 19, one UE antenna port may be associated with multiple SRS ports and measured twice.

[0088] [[Option 6]] One resource set has two SRS resources that are transmitted in different symbols. One SRS resource has six SRS ports, and the other SRS resource has two SRS ports (Figure 20). This option may apply if six SRS ports are supported / configured for antenna switching.

[0089] [[Option 7]] A single resource set has two SRS resources that are transmitted in different symbols. Each SRS resource has six SRS ports. This option may apply if six SRS ports are supported / configured for antenna switching.

[0090] [[Option 8]] A resource set has two SRS resources transmitted in different symbols. One SRS resource has six SRS ports, and the other SRS resource has four SRS ports. This option may apply if six SRS ports are supported / configured for antenna switching.

[0091] The UE may apply one of options 1-5 if six SRS ports are not supported / configured for antenna switching.

[0092] For options 6 / 7 / 8, the UE may signal / report new UE capabilities regarding support for 6-port SRS for antenna switching / non-codebook.

[0093] In 6T8R, if the UE does not demonstrate specific UE capabilities corresponding to Rel.17 / 18 (r17 / r18), zero or one SRS resource set may be set to "Semi-Persistent". Alternatively, if the UE demonstrates specific UE capabilities corresponding to Rel.17 / 18, up to two SRS resource sets may be set to semi-persistent and up to one SRS resource set may be set to "periodic". Here, two SRS resource sets set to semi-persistent will not be active simultaneously. Any of the above options 1 to 8 may be applied to the number of SRS resources per resource set and the number of ports per SRS resource.

[0094] [Aspect 1-1-2] In 6T8R, if the UE does not demonstrate specific UE capabilities corresponding to Rel.17 / 18 (r17 / r18), different values ​​(periodic or semi-persistent) may be set as the resource type value of "SRS-ResourceSet" for 0, 1, or 2 SRS resource sets. Alternatively, if the UE demonstrates specific capabilities corresponding to Rel.17 / 18 (r17 / r18), up to two SRS resource sets may be set to "Semi-Persistent" and up to one SRS resource set to "Periodic". Here, the two SRS resource sets set to semi-persistent do not have to be active at the same time. Any of the above options 1 to 8 may be applied to the number of SRS resources per resource set and the number of ports per SRS resource.

[0095] The UE capability corresponding to Rel.17 / 18 (r17 / r18) may be either the UE capability corresponding to Rel.17 (a UE capability indicating support for up to two "semi-persistent" SRS resource sets and up to one "periodic" SRS resource set for antenna switching) or the UE capability corresponding to the new Rel.18 (e.g., the maximum number of SRS resource sets for SP / P / AP, separate or joint).

[0096] The UE capabilities corresponding to this Rel.17 may apply to all xTyR where y is 8 or greater. If y of xTyR is greater than 4 and the UE capabilities corresponding to this Rel.17 are not supported, the UE may support up to one SRS resource set for P-SRS and up to one SRS resource set for SP-SRS. If y of xTyR is 4 or less and the UE capabilities corresponding to this Rel.17 are not supported, the UE may follow the number (maximum) of P-SRS and SP-SRS in Rel.15. It may be specified that the two SP-SRS resource sets cannot be active at the same time.

[0097] Each SRS port (pair) of a resource within a single SRS resource set may be associated with a different UE antenna port (pair). SRS ports (pairs) of SRS resources within different SRS resource sets may be associated with different UE antenna ports (pairs) in some options (options 1 / 2 / 3 / 6), but with the same UE antenna port (pair) in other options (options 4 / 5 / 7 / 8).

[0098] <Embodiment 1-2> Embodiment 1-2 describes an SRS resource set in which six or more SRS ports and eight or more antenna ports (e.g., 6T8R) are applied, and the resource type of the corresponding RRC parameter "SRS-ResourceSet" is set to "aperiodic". The UE controls the transmission of SRS within the SRS resource set using six or more SRS ports and eight or more antenna ports (e.g., 6T8R). In this case, any of the following options may be applied.

[0099] [[Option 1]] One or more resource sets have a total of two SRS resources. Each SRS resource has four SRS ports (Figure 21).

[0100] [[Option 2]] One or more resource sets have a total of four SRS resources. Each SRS resource has two SRS ports (Figures 22, 23). For example, each SRS resource set may have two SRS resources (Figure 22). Alternatively, the first SRS resource set may have one SRS resource, and the second SRS resource set may have three SRS resources (Figure 23).

[0101] [[Option 3]] One or more resource sets have a total of three SRS resources. One SRS resource has four SRS ports. The other two SRS resources each have two SRS ports.

[0102] [[Option 4]] One or more resource sets have a total of three SRS resources. Each SRS resource has four SRS ports.

[0103] [[Option 5]] One or more resource sets have a total of four SRS resources. Each SRS resource has four SRS ports.

[0104] [[Option 6]] One or more resource sets have two SRS resources. One SRS resource has six SRS ports, and the other SRS resource has two SRS ports (Figure 24). This option may apply if six SRS ports are supported / configured in antenna switching.

[0105] [[Option 7]] One or more resource sets have two SRS resources. Each SRS resource has six SRS ports. This option may apply if six SRS ports are supported / configured in antenna switching.

[0106] [[Option 8]] One or more resource sets have two SRS resources. One SRS resource has six SRS ports, and the other SRS resource has four SRS ports. This option may apply if six SRS ports are supported / configured in antenna switching.

[0107] The UE may apply one of options 1-5 if six SRS ports are not supported / configured for antenna switching.

[0108] For options 6 / 7 / 8, the UE may signal / report new UE capabilities regarding support for 6-port SRS for antenna switching / non-codebook.

[0109] The number of SRS resource sets may be determined by any of the following optional ADs. The number of SRS resource sets and the number of SRS resources included in each SRS resource set may be set by upper-layer signaling / physical-layer signaling or defined in the specification.

[0110] [[Option A]] (corresponding to Options 1 / 6 / 7 / 8) A number of SRS resource sets, from 0 to 2, is applied. Figures 21 and 24 show an example of two SRS resource sets.

[0111] [[Option B]] (corresponding to Options 2 / 5) Any number of SRS resource sets from 0 to 4 are applied. If two SRS resource sets are applied, each SRS resource set may have two SRS resources (Figure 22). If two SRS resource sets are applied, one SRS resource set may have one SRS resource and the other SRS resource set may have three SRS resources (Figure 23).

[0112] If three SRS resource sets are applied, one (first) SRS resource set may have one SRS resource, another (second) SRS resource set may have one SRS resource, and another (third) SRS resource set may have two SRS resources.

[0113] [[Option C]] (corresponding to Option 3) Any number of SRS resource sets from 0 to 3 are applied. If two SRS resource sets are applied, one SRS resource set may have one SRS resource with four SRS ports, and the other SRS resource set may have two SRS resources, each with two SRS ports. If two SRS resource sets are applied, one SRS resource set may have one SRS resource with two SRS ports and one SRS resource with four SRS ports, and the other SRS resource set may have the remaining SRS resources with two SRS ports.

[0114] [[Option D]] (corresponding to Option 4) Any number of SRS resource sets from 0 to 3 are applied. If two SRS resource sets are applied, one SRS resource set may have two SRS resources, and the other SRS resource set may have one SRS resource.

[0115] In options A through D, if there are X SRS resource sets and X is equal to the number of SRS resources, each SRS resource set may have one SRS resource. In each option, which SRS resources are included in which SRS resource set may be determined by upper-layer signaling / physical-layer signaling. If Y resource sets are applied, the UE may transmit X SRS resources in different symbols in Y different slots. The UE may transmit (report) a new UE capability (e.g., Cap-AP-r18) regarding the maximum number of "aperiodic" SRS resource sets of a given xTyR.

[0116] According to this embodiment, the configuration of the SRS resource set, SRS resources, and SRS port when 6T8R is applied is clarified, and the UE can perform appropriate SRS transmission by receiving these settings.

[0117] <Embodiment 2> Embodiment 2 describes an example where 6T6R or 8T8R is applied and the UE does not support (or indicates) a specific UE (terminal) capability (e.g., capability information corresponding to Rel.17 / 18 (r17 / r18)). If the UE does not support the above specific terminal capability, it may control SRS transmission using six or more SRS ports (e.g., 6T6R or 8T8R) in the same number as the number of antenna ports. In this case, one of the following options may be applied.

[0118] [[Option 1]] A set of 0 to 2 SRS resources is applied, each containing one SRS resource. The number of SRS ports for each SRS resource is 1, 2, or 4.

[0119] [[Option 2]] A set of 0 to 3 SRS resources is applied, each having one SRS resource. The number of SRS ports for each SRS resource is 1, 2, or 4.

[0120] [[Option 3]] A set of 0 to 4 SRS resources is applied, each having one SRS resource. The number of SRS ports for each SRS resource is 1, 2, or 4.

[0121] [[Option 4]] A set of 0 to 2 SRS resources is applied, each containing 2 SRS resources. The number of SRS ports for each SRS resource is 1, 2, or 4.

[0122] [[Option 5]] One or two sets of SRS resources are applied, each having two SRS resources. The number of SRS ports for each SRS resource is 1, 2, or 4.

[0123] [[Option 6]] A set of 0 to 2 SRS resources is applied, each containing 4 SRS resources. The number of SRS ports for each SRS resource is 1, 2, or 4.

[0124] [[Option 7]] One or two sets of SRS resources are applied, each having four SRS resources. The number of SRS ports for each SRS resource is 1, 2, or 4.

[0125] [[Option 8]] If 6-port SRS is supported / configured for antenna switching, or if new UE capability signaling / reporting has been made regarding support for 6 SRS ports for antenna switching / non-codebook, one SRS resource may have 6 SRS ports. Option 8 may be combined with any of Options 1-7.

[0126] [[Option 9]] If eight SRS ports are supported / configured for antenna switching, or if new UE capability signaling / reporting is performed regarding support for eight SRS ports for antenna switching / non-codebook, one SRS resource may have eight SRS ports. Option 9 may be combined with any of Options 1-7.

[0127] Two or more SRS resource sets may be applied only to "aperiodic" operation. The UE may transmit (report) a new UE capability (e.g., Cap-AP-r18) regarding the maximum number of SRS resource sets for "aperiodic" operation or for antenna switching with a specific port SRS (e.g., for 6-port or 8-port SRS).

[0128] If the UE is exhibiting a new specific UE capability (cap_r17 / r18), up to two SRS resource sets may be configured with the RRC parameter SRS-ResourceSet's resourceType set to "Semi-Persistent" and up to one SRS resource set with the SRS-ResourceSet's resourceType set to "Periodic". The two SRS resource sets configured to "Semi-Persistent" do not need to be activated simultaneously.

[0129] According to this embodiment, the configurations of the SRS resource set, SRS resource, and SRS port when 6T6R and 8T8R are applied are clarified, and the UE can perform appropriate SRS transmission by receiving these settings.

[0130] <Embodiment 3> When 6T8R is applied, the UE does not expect (is not set / triggered) that more than 1 SRS resource set with the usage of the upper layer parameter set to antenna switching is set / triggered within the same slot.

[0131] When 6T = 6R or 8T = 8R is applied, the UE does not expect (is not set / triggered) that more than 1 SRS resource set with the usage of the upper layer parameter set to antenna switching is set / triggered within the same symbol.

[0132] <Others> As described above, when 6T / 8T is applied to the SRS port, 6 ports / 8 ports may be applied to the PUSCH of the CB (codebook).

[0133] If 6 / 8 SRS ports for antenna switching are not supported, the UE may set 1 / 2 / 4 SRS ports for antenna switching and perform DL CSI measurement / reporting for the 6T / 8T UE (for example, Options 1 to 5 of Embodiment 1-1 and Embodiment 1-2, Options 1 to 7 of Embodiment 2).

[0134] <UE 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 for enable / disable) relating to 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 the UE that received such instructions / settings, the UE that transmitted the corresponding UE capability information, or the UE that supports the corresponding UE capability.

[0135] (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.

[0136] Figure 25 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).

[0137] 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.

[0138] 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.

[0139] 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))).

[0140] 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.

[0141] 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).

[0142] 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.

[0143] 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).

[0144] 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.

[0145] 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.

[0146] The user terminal 20 may be a terminal that supports at least one of the following communication methods: LTE, LTE-A, 5G, etc.

[0147] 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).

[0148] 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.

[0149] 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.

[0150] 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.

[0151] 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.

[0152] 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.

[0153] 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.

[0154] 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.

[0155] 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.

[0156] 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.

[0157] In this disclosure, downlinks, uplinks, etc., may be expressed without the prefix "link." Also, the prefix "physical" may be omitted when describing various channels.

[0158] 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.

[0159] 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.

[0160] 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).

[0161] (base station) Figure 26 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.

[0162] 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.

[0163] The control unit 110 controls the entire base station 10. The control unit 110 can be composed of a controller, control circuit, etc., as described based on common understanding in the art relating to this disclosure.

[0164] 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.

[0165] 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.

[0166] 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.

[0167] 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.

[0168] 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.

[0169] 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.

[0170] 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.

[0171] 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.

[0172] 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.

[0173] 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.

[0174] 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.

[0175] 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.

[0176] 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.

[0177] 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.

[0178] The transmitting / receiving unit 120 may also transmit higher-layer parameters indicating antenna switching as part of the Sounding Reference Signal (SRS) resource set. Depending on the terminal capability information regarding antenna switching, the transmitting / receiving unit 120 may apply 6 or more SRS ports and 6 or more antenna ports at the terminal and receive SRS transmitted using the 6 or more SRS ports and 6 or more antenna ports. The control unit 110 may control the transmission and reception of the transmitting / receiving unit 120.

[0179] (User terminal) Figure 27 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.

[0180] 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.

[0181] 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.

[0182] 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.

[0183] 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.

[0184] 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.

[0185] 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.

[0186] 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.

[0187] The transmitting / receiving unit 220 may use digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), or the like to form at least one of the transmitting beam and the receiving beam.

[0188] 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.

[0189] 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.

[0190] 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.

[0191] 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.

[0192] 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.

[0193] 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.

[0194] 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.

[0195] 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.

[0196] The transmitting / receiving unit 220 may also receive higher-layer parameters indicating antenna switching for use as a Sounding Reference Signal (SRS) resource set.

[0197] The control unit 210 may apply six or more SRS ports and six or more antenna ports according to the terminal capability information related to antenna switching.

[0198] The control unit 210 may control the transmission of SRS within the SRS resource set, which is set to periodic or semi-persistent as a resource type, using six or more SRS ports and eight or more antenna ports.

[0199] The control unit 210 may control the transmission of SRS within the SRS resource set, which is set to aperiodic as the resource type, using six or more SRS ports and eight or more antenna ports.

[0200] If the control unit 210 does not support a specific terminal capability, it may control SRS transmission using six or more SRS ports, the same number as the number of antenna ports.

[0201] (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.

[0202] 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.

[0203] 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 28 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.

[0204] 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.

[0205] 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.

[0206] 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.

[0207] 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.

[0208] 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.

[0209] 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.

[0210] 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.

[0211] 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).

[0212] 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).

[0213] 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.

[0214] 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.

[0215] (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.

[0216] 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.

[0217] 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.

[0218] 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.

[0219] 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.

[0220] 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.

[0221] 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.

[0222] 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.

[0223] 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.

[0224] 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.

[0225] 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.

[0226] 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.

[0227] 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.

[0228] 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.

[0229] One or more RBs may also be called Physical RBs (PRBs), Sub-Carrier Groups (SCGs), Resource Element Groups (REGs), PRB pairs, RB pairs, etc.

[0230] 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.

[0231] 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.

[0232] 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.

[0233] 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".

[0234] 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.

[0235] 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.

[0236] 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.

[0237] 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.

[0238] 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.

[0239] 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.

[0240] 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).

[0241] 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).

[0242] 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).

[0243] 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).

[0244] 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.

[0245] 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.

[0246] 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).

[0247] 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.

[0248] 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.

[0249] 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.

[0250] In this disclosure, terms such as "Mobile Station (MS)," "user terminal," "User Equipment (UE)," and "terminal" may be used interchangeably.

[0251] 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.

[0252] 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.

[0253] 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.

[0254] 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.

[0255] Figure 29 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.

[0256] The drive unit 41 consists of, for example, at least one of an engine, a motor, or an engine-motor hybrid. 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.

[0257] The electronic control unit 49 consists of a microprocessor 61, memory (ROM, RAM) 62, and communication ports (e.g., input / output (IO) ports) 63. Signals from various sensors 50-58 installed in the vehicle are input to the electronic control unit 49. The electronic control unit 49 may also be called an Electronic Control Unit (ECU).

[0258] Signals from various sensors 50-58 include current signals from current sensor 50 for sensing motor current, rotational speed signals of front wheels 46 / rear wheels 47 acquired by rotational speed sensor 51, air pressure signals of front wheels 46 / rear wheels 47 acquired by air pressure sensor 52, vehicle speed signals acquired by vehicle speed sensor 53, acceleration signals acquired by acceleration sensor 54, accelerator pedal depression signal of accelerator pedal 43 acquired by accelerator pedal sensor 55, brake pedal depression signal of brake pedal 44 acquired by brake pedal sensor 56, operation signals of shift lever 45 acquired by shift lever sensor 57, and detection signals for detecting obstacles, vehicles, pedestrians, etc., acquired by object detection sensor 58.

[0259] The information service unit 59 consists of various devices for providing (outputting) various types of information such as driving information, traffic information, and entertainment information, including a car navigation system, audio system, speakers, displays, television, and radio, and one or more ECUs that control these devices. The information service unit 59 uses information acquired from external devices via a communication module 60 or the like to provide various types of information / services (e.g., multimedia information / multimedia services) to the occupants of the vehicle 40.

[0260] The information service unit 59 may include input devices that accept input from the outside (e.g., keyboard, mouse, microphone, switch, button, sensor, touch panel, etc.) and output devices that perform output to the outside (e.g., display, speaker, LED lamp, touch panel, etc.).

[0261] The driver assistance system unit 64 consists of various devices that provide functions to prevent accidents or reduce the driver's workload, such as millimeter-wave radar, Light Detection and Ranging (LiDAR), cameras, positioning locators (e.g., Global Navigation Satellite System (GNSS)), map information (e.g., High Definition (HD) maps, Autonomous Vehicle (AV) maps), gyro systems (e.g., Inertial Measurement Unit (IMU), Inertial Navigation System (INS)), artificial intelligence (AI) chips, and AI processors, as well as one or more ECUs that control these devices. The driver assistance system unit 64 also transmits and receives various information via the communication module 60 to realize driver assistance functions or autonomous driving functions.

[0262] The communication module 60 can communicate with the microprocessor 61 and components of the vehicle 40 via the communication port 63. For example, the communication module 60 sends and receives data (information) via the communication port 63 to 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, the microprocessor 61 and memory (ROM, RAM) 62 in the electronic control unit 49, and various sensors 50-58 provided in the vehicle 40.

[0263] 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 an external device. For example, it transmits and receives various types of information via wireless communication with the external device. The communication module 60 may be located either inside or outside the electronic control unit 49. The external device may be, for example, the above-described base station 10, user terminal 20, etc. Also, the communication module 60 may be, for example, at least one of the above-described base station 10 and user terminal 20 (it may function as at least one of the base station 10 and user terminal 20).

[0264] The communication module 60 may transmit at least one of the signals from the various sensors 50 - 58 described above input to the electronic control unit 49, the information obtained based on the signals, and the information based on the input from the external (user) obtained via the information service unit 59, to the external device via wireless communication. The electronic control unit 49, the various sensors 50 - 58, the information service unit 59, etc. may be referred to as an input unit that receives an input. For example, the PUSCH transmitted by the communication module 60 may include the information based on the above input.

[0265] The communication module 60 receives various types of information (traffic information, signal information, inter-vehicle information, etc.) transmitted from the external device and displays it on the information service unit 59 provided in the vehicle. The information service unit 59 may be referred to as an output unit that outputs information (for example, outputs information to devices such as a display and a speaker based on the PDSCH received by the communication module 60 (or the data / information decoded from the PDSCH)).

[0266] Also, the communication module 60 stores the various types of information received from the external device in the 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. provided in the vehicle 40.

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

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

[0269] In the present disclosure, operations assumed to be performed by the base station may in some cases be performed by its upper node. In a network including one or more network nodes having a base station, it is clear that various operations performed for communication with a terminal can be performed by the base station, one or more network nodes other than the base station (for example, Mobility Management Entity (MME), Serving-Gateway (S-GW), etc., but not limited thereto), or a combination thereof.

[0270] 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.

[0271] 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).

[0272] 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."

[0273] 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.

[0274] 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.

[0275] 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).

[0276] 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.

[0277] Furthermore, "judgment (decision)" can be replaced with "assuming," "expecting," or "considering."

[0278] 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.”

[0279] 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).

[0280] 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."

[0281] Where the terms “include,” “including,” and variations thereof are used in this disclosure, these terms are intended to be inclusive, as is the term “comprising.” Furthermore, the term “or” as used in this disclosure is not intended to mean exclusive OR.

[0282] In this disclosure, if articles are added by translation, such as a, an, and the in English, this disclosure may include the fact that the noun following these articles is plural.

[0283] Although the invention described herein has been explained in detail above, it will be clear to those skilled in the art that the invention described herein is not limited to the embodiments described herein. The invention described herein can be implemented in modified and altered forms without departing from the spirit and scope of the invention as defined in the claims. Therefore, the descriptions herein are for illustrative purposes only and do not imply any limitation on the invention described herein.

Claims

1. The Sounding Reference Signal (SRS) resource set includes a receiver that receives higher-layer parameters indicating antenna switching, and The system includes a control unit that controls the transmission of SRS using the eight SRS ports and the eight receiving ports, in accordance with terminal capability information supporting the eight SRS ports and eight receiving ports for antenna switching. The control unit controls the transmission of the SRS within up to two SRS resource sets in which the resource type of the SRS resource set is set to semi-persistent, and up to one SRS resource set in which the resource type is set to periodic. Two SRS resource sets, both configured as semi-persistent resource types, are not activated simultaneously. The control unit does not assume that more than one SRS resource set will be set for the antenna switching for the application indicated by the upper layer parameters. Terminal.

2. Up to two of the aforementioned SRS resource sets are configured, each SRS resource set having one SRS resource, and each SRS resource having 1, 2, 4, or 8 SRS ports. The terminal according to claim 1.

3. The aforementioned terminal capability information indicates that it also supports fewer than eight SRS ports and receiving ports. The terminal according to claim 1.

4. The process involves receiving higher-layer parameters indicating antenna switching as an application of the Sounding Reference Signal (SRS) resource set, The process includes controlling the transmission of SRS within a maximum of two SRS resource sets, each with a resource type of semi-persistent, and a maximum of one SRS resource set with a resource type of periodic, using the eight SRS ports and eight receiving ports, in accordance with terminal capability information supporting the eight SRS ports and eight receiving ports for antenna switching. Two SRS resource sets, both configured as semi-persistent resource types, are not activated simultaneously. It is not assumed that more than one SRS resource set will be set for the antenna switching for the application indicated by the above-mentioned upper-layer parameters. The wireless communication method used by the terminal.

5. The Sounding Reference Signal (SRS) resource set includes a transmitter that sends higher-layer parameters indicating antenna switching to the terminal, and The system includes a control unit that controls the reception of SRS transmitted from the terminal within a maximum of two SRS resource sets, each with a resource type of semi-persistent, and each with a resource type of periodic, in accordance with terminal capability information supporting the eight SRS ports and eight receiving ports for antenna switching, and the system uses the eight SRS ports and eight receiving ports to control the reception of SRS transmitted from the terminal within a maximum of two SRS resource sets, each with a resource type of semi-persistent, and each with a resource type of periodic. The control unit controls the terminal so that it does not expect that more than one SRS resource set is set for the antenna switching for the application indicated by the upper layer parameter. Two SRS resource sets, both configured as semi-persistent resource types, are not activated simultaneously. Base station.

6. A system including terminals and base stations, The aforementioned terminal is The Sounding Reference Signal (SRS) resource set includes a receiver that receives higher-layer parameters indicating antenna switching, and The system includes a control unit that controls the transmission of SRS using the eight SRS ports and the eight receiving ports, in accordance with terminal capability information supporting the eight SRS ports and eight receiving ports for antenna switching. The control unit controls the transmission of the SRS within up to two SRS resource sets in which the resource type of the SRS resource set is set to semi-persistent, and up to one SRS resource set in which the resource type is set to periodic. Two SRS resource sets, both configured as semi-persistent resource types, are not activated simultaneously. The control unit does not assume that more than one SRS resource set will be set for the antenna switching for the application indicated by the upper layer parameters, The aforementioned base station is A transmission unit that transmits the aforementioned upper layer parameters to the terminal, A system comprising a control unit that controls the reception of the SRS.

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