JP7737563B2 - Terminal, wireless communication method, base station and system - Google Patents

Description

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

Long Term Evolution (LTE) was specified for Universal Mobile Telecommunications System (UMTS) networks with the aim of achieving even higher data rates and lower latency (Non-Patent Document 1). Furthermore, LTE-Advanced (3GPP Rel. 10-14) was specified with the aim of achieving even higher capacity and improving the sophistication of LTE (Third Generation Partnership Project (3GPP (registered trademark)) Release (Rel.) 8, 9).

Successor systems to LTE (also known as 5th generation mobile communication system (5G), 5G+ (plus), 6th generation mobile communication system (6G), New Radio (NR), 3GPP Rel. 15 or later, etc.) are also being considered.

3GPP TS 36.300 V8.12.0 “Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2 (Release 8)”, April 2010

In future wireless communication systems (e.g., Rel. 18 NR and beyond), a UE will be able to use one of multiple panels (or multiple beams) for uplink (UL) transmission. To improve UL throughput and reliability, support for simultaneous UL transmission using multiple panels (e.g., simultaneous multi-panel UL transmission (STxMP)) to one or more Transmission/Reception Points (TRPs) is being considered.

When multi-panel simultaneous UL transmission is supported, the UE transmits UL from two panels simultaneously, but there has been insufficient research into how to control this UL transmission.

Therefore, one of the objectives of the present disclosure is to provide a terminal, a wireless communication method , a base station , and a system that can appropriately control transmission even when simultaneous transmission using multiple panels is supported.

A terminal according to one aspect of the present disclosure includes a receiving unit that receives multiple pieces of configuration information related to sounding reference signal (SRS) resources, and a control unit that controls uplink (UL) transmissions transmitted from multiple panels using a spatial division multiplexing method based on a combination of multiple SRS resource identifiers (SRIs) indicated by one or more fields included in downlink control information, wherein a combination of a maximum number of layers supported for the UL transmission and the number of SRS resources that can be set for each panel is defined , and the number of SRS resources is less than or equal to a specific number .

According to one aspect of the present disclosure, transmission control can be performed appropriately even when simultaneous transmission using multiple panels is supported.

1A and 1B show an example of a single panel UL transmission. 2A to 2C are diagrams showing examples of methods 1 to 3 for simultaneous UL transmission using multiple panels. 3A to 3C are diagrams illustrating an example of a PUSCH transmission method. 4A to 4C are diagrams illustrating other examples of the PUSCH transmission method. FIG. 5 is a diagram illustrating an example of the association (for example, a table) between the maximum rank and the number of SRS resources in each panel according to the first embodiment. FIG. 6 is a diagram showing another example of the association (for example, a table) between the maximum rank and the number of SRS resources in each panel according to the first embodiment. FIG. 7 is a diagram showing another example of the association (for example, a table) between the maximum rank and the number of SRS resources in each panel according to the first embodiment. FIG. 8 is a diagram illustrating an example of association (for example, a table) between code points in a DCI field (for example, an SRI field) and SRIs corresponding to each code point according to the second embodiment. FIG. 9 is a diagram illustrating another example of the association (for example, a table) between code points in a DCI field (for example, an SRI field) and the SRI corresponding to each code point according to the second embodiment. FIG. 10 is a diagram illustrating another example of the association (for example, a table) between code points in a DCI field (for example, an SRI field) and the SRI corresponding to each code point according to the second embodiment. FIG. 11 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment. FIG. 12 is a diagram illustrating an example of the configuration of a base station according to an embodiment. FIG. 13 is a diagram illustrating an example of the configuration of a user terminal according to an embodiment. FIG. 14 is a diagram illustrating an example of the hardware configuration of a base station and a user terminal according to an embodiment. FIG. 15 is a diagram illustrating an example of a vehicle according to an embodiment.

(Control of SRS and PUSCH transmission)
In Rel. 15 NR, a terminal (user terminal, User Equipment (UE)) may receive information (SRS configuration information, for example, parameters in the RRC control element "SRS-Config") used to transmit a measurement reference signal (e.g., a sounding reference signal (SRS)).

Specifically, the UE may receive at least one of information regarding one or more SRS resource sets (SRS resource set information, e.g., the RRC control element "SRS-ResourceSet") and information regarding one or more SRS resources (SRS resource information, e.g., the RRC control element "SRS-Resource").

An SRS resource set may be associated with (or group together) a predetermined number of SRS resources. Each SRS resource may be identified by an SRS Resource Indicator (SRI) or SRS Resource Identifier (ID).

SRS resource set information may include an SRS resource set ID (SRS-ResourceSetId), a list of SRS resource IDs (SRS-ResourceId) used in the resource set, an SRS resource type, and SRS usage information.

Here, the SRS resource type may indicate either periodic SRS (P-SRS), semi-persistent SRS (SP-SRS), or aperiodic CSI (Aperiodic SRS (A-SRS)). Note that the UE may transmit P-SRS and SP-SRS periodically (or periodically after activation) and transmit A-SRS based on an SRS request in the DCI.

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

For example, in the case of codebook-based transmission, the UE may determine a precoder (precoding matrix) for PUSCH transmission based on the SRI, a Transmitted Rank Indicator (TRI), and a Transmitted Precoding Matrix Indicator (TPMI). In the case of non-codebook-based transmission, the UE may determine a precoder for PUSCH transmission based on the SRI.

SRS resource information may include SRS resource ID (SRS-ResourceId), SRS port number, SRS port number, transmission comb, SRS resource mapping (e.g., time and/or frequency resource position, resource offset, resource period, number of repetitions, number of SRS symbols, SRS bandwidth, etc.), hopping-related information, SRS resource type, sequence ID, spatial relationship information of SRS, etc.

The spatial relationship information of the SRS (e.g., the RRC information element "spatialRelationInfo") may indicate spatial relationship information between a predetermined reference signal and the SRS. The predetermined reference signal may be at least one of a Synchronization Signal/Physical Broadcast Channel (SS/PBCH) block, a Channel State Information Reference Signal (CSI-RS), and an SRS (e.g., another SRS). The SS/PBCH block may be referred to as a Synchronization Signal Block (SSB).

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

In the present disclosure, the SSB index, SSB resource ID, and SSB Resource Indicator (SSBRI) may be interchangeable. Also, the CSI-RS index, CSI-RS resource ID, and CSI-RS Resource Indicator (CRI) may be interchangeable. Also, the SRS index, SRS resource ID, and SRI may be interchangeable.

The spatial relationship information of the SRS may include a serving cell index, a BWP index (BWP ID), etc. corresponding to the above-mentioned specified reference signal.

When the UE is configured with spatial relationship information regarding the SRS and the SSB or CSI-RS for a certain SRS resource, the UE may transmit the SRS resource using the same spatial domain filter (spatial domain transmit filter) as the spatial domain filter for receiving the SSB or CSI-RS. In this case, the UE may assume that the UE receive beam for the SSB or CSI-RS and the UE transmit beam for the SRS are the same.

When spatial relationship information regarding a certain SRS (target SRS) resource is configured between another SRS (reference SRS) and the SRS (target SRS), the UE may transmit the target SRS resource using the same spatial domain filter (spatial domain transmit filter) as the spatial domain filter (spatial domain transmit filter) used to transmit the reference SRS. In other words, in this case, the UE may assume that the UE transmit beam for the reference SRS and the UE transmit beam for the target SRS are the same.

The UE may determine the spatial relationship of the PUSCH scheduled by the DCI (e.g., DCI format 0_1) based on the value of a predetermined field (e.g., an SRS resource identifier (SRI) field) in the DCI. Specifically, the UE may use spatial relationship information of the SRS resources (e.g., the RRC information element "spatialRelationInfo") determined based on the value of the predetermined field (e.g., the SRI) for PUSCH transmission.

In Rel. 15/16 NR, when codebook-based transmission is used for PUSCH, the UE is configured by RRC with an SRS resource set for the codebook with up to two SRS resources, and one of the up to two SRS resources may be indicated by DCI (1-bit SRI field). The transmission beam for PUSCH is specified by the SRI field.

The UE may determine the TPMI and number of layers (transmission rank) for the PUSCH based on the precoding information and number of layers field (hereinafter also referred to as the precoding information field).The UE may select a precoder based on the TPMI, number of layers, etc. from an uplink codebook for the same number of SRS ports as the number of SRS ports indicated by the upper layer parameter "nrofSRS-Ports" configured for the SRS resource specified by the SRI field.

In Rel. 15/16 NR, when non-codebook-based transmission is used for PUSCH, the UE is configured by RRC with a non-codebook-used SRS resource set having up to four SRS resources, and one or more of the up to four SRS resources may be indicated by DCI (2-bit SRI field).

The UE may determine the number of layers (transmission rank) for the PUSCH based on the SRI field. For example, the UE may determine that the number of SRS resources specified by the SRI field is the same as the number of layers for the PUSCH. The UE may also calculate a precoder for the SRS resources.

If the CSI-RS (which may also be called associated CSI-RS) associated with the SRS resource (or the SRS resource set to which the SRS resource belongs) is configured by a higher layer, the transmission beam for the PUSCH may be calculated based on (measurements of) the configured associated CSI-RS. Otherwise, the transmission beam for the PUSCH may be specified by the SRI.

Note that the UE may be configured to use codebook-based PUSCH transmission or non-codebook-based PUSCH transmission by the higher layer parameter "txConfig" that indicates the transmission scheme. This parameter may indicate the value of "codebook" or "non-codebook."

In this disclosure, codebook-based PUSCH (codebook-based PUSCH transmission, codebook-based transmission) may refer to PUSCH when "codebook" is configured as the transmission scheme for the UE. In this disclosure, non-codebook-based PUSCH (non-codebook-based PUSCH transmission, non-codebook-based transmission) may refer to PUSCH when "non-codebook" is configured as the transmission scheme for the UE.

Incidentally, future wireless communication systems (e.g., Rel. 18 NR and later) are expected to support simultaneous UL transmission (e.g., simultaneous multi-panel UL transmission (STxMP)) using multiple beams/panels/TRPs toward one or more transmission/reception points (TRPs).

For example, Rel. 18 considers simultaneous UL transmission using up to two TRPs per two panels. It also considers single-DCI-based and multi-DCI-based multi-TRP operation, and envisions a maximum of four layers across all panels and a maximum of two codewords across all panels. Of course, the number of TRPs, panels, layers, and codewords are not limited to these.

(single panel transmission)
The single-panel UL transmission scheme or the candidate single-panel UL transmission scheme may be at least one of the following transmission schemes A and B (single-panel UL transmission schemes A and B). In the present disclosure, a panel/UE panel may be interpreted as a UE capability value set (e.g., a UE capability value set) reported for each UE capability. In the present disclosure, different panels, different spatial relationships, different joint TCI states, different TPC parameters, different antenna ports, etc. may be interpreted as interchangeable terms.

[Transmission Method A: Single Panel Single TRP UL Transmission]
In Rel. 15 and Rel. 16, a transmission scheme is used in which a UE transmits UL for one TRP from only one beam and panel at a time (FIG. 1A).

[Transmission method B: Single panel multi-TRP UL transmission]
Rel. 17 considers UL transmission from only one beam and panel at a time and repeated transmission for multiple TRPs (Fig. 1B). In the example of Fig. 1B, the UE transmits a PUSCH from panel #1 to TRP #1 (switching beams and panels), and then transmits a PUSCH from panel #2 to TRP #2. The two TRPs are connected via an ideal backhaul.

(Multi-panel transmission)
In Rel. 18 and later, in order to improve UL throughput/reliability, support for simultaneous UL transmission using multiple panels (e.g., simultaneous multi-panel UL transmission (STxMP)) for one or more TRPs is being considered. Also, a multi-panel UL transmission scheme is being considered for a specific UL channel (e.g., PUSCH/PUCCH).

For multi-panel UL transmission, for example, up to X (e.g., X = 2) and up to Y (e.g., Y = 2) panels may be supported. In multi-panel UL transmission, if UL precoding instructions for PUSCH are supported, codebooks of existing systems (e.g., pre-Rel. 16) may be supported for simultaneous multi-panel transmission. Considering single DCI and multi-DCI based multi-TRP operation, the number of layers may be up to x (e.g., x = 4) across all panels, and the number of codewords (CWs) may be up to y (e.g., y = 2) across all panels.

At least one of the following methods 1 to 3 (multi-panel UL transmission methods 1 to 3) is being considered as a multi-panel UL transmission method or candidate multi-panel UL transmission method. Only one of transmission methods 1 to 3 may be supported. Multiple methods including at least one of transmission methods 1 to 3 may be supported, and one of the multiple transmission methods may be configured in the UE.

<Transmission method 1: Coherent multi-panel UL transmission>
Multiple panels may be synchronized with each other. All layers are mapped to all panels. Multiple analog beams are directed. The SRS Resource Indicator (SRI) field may be extended. This scheme may use up to 4 layers for the UL.

In the example of Figure 2A, the UE maps one codeword (CW) or one transport block (TB) to L layers (PUSCH (1, 2, ..., L)) and transmits L layers from each of two panels. Panels #1 and #2 are coherent. Transmission method 1 can obtain diversity gain. The total number of layers in the two panels is 2L. If the maximum total number of layers is 4, the maximum number of layers in one panel is 2.

<Transmission Scheme 2: Non-coherent Multi-Panel UL Transmission of One Codeword (CW) or Transport Block (TB)>
Multiple panels may not be synchronized. Different layers are mapped to different panels and one CW or TB for PUSCHs from multiple panels. A layer corresponding to one CW or TB may be mapped to multiple panels. This transmission scheme may use up to four layers or up to eight layers for the UL. If up to eight layers are supported, this transmission scheme may support one CW or TB using up to eight layers.

In the example of Figure 2B, the UE maps 1 CW or 1 TB to k layers (PUSCH(1, 2, ..., k)) and L-k layers (PUSCH(k+1, k+2, ..., L)), transmits k layers from panel #1, and transmits L-k layers from panel #2. Transmission method 2 can obtain gains through multiplexing and diversity. The total number of layers in the two panels is L.

<Transmission Method 3: Two CW or TB Non-Coherent Multi-Panel UL Transmissions>
Multiple panels may not be synchronized. Different layers are mapped to different panels and two CWs or TBs for PUSCH from multiple panels. A layer corresponding to one CW or TB may be mapped to one panel. Layers corresponding to multiple CWs or TBs may be mapped to different panels. This transmission scheme may use up to four layers or up to eight layers for the UL. When supporting up to eight layers, this transmission scheme may support up to four layers per CW or TB.

In the example of Figure 2C, the UE maps CW#1 or TB#1 of the 2CWs or 2TBs to k layers (PUSCH (1, 2, ..., k)), maps CW#2 or TB#2 to L-k layers (PUSCH (k+1, k+2, ..., L)), and transmits k layers from panel #1 and L-k layers from panel #2. Transmission method 3 can obtain gains through multiplexing and diversity. The total number of layers in the two panels is L.

In each of the above transmission schemes, the base station may configure or indicate panel-specific transmission for UL transmission using UL TCI or panel ID. UL TCI (UL TCI state) may be based on signaling similar to DL beam indication supported in Rel. 15. The panel ID may be implicitly or explicitly applied to transmission of at least one of the target RS resource or target RS resource set, PUCCH, SRS, and PRACH. When the panel ID is explicitly signaled, the panel ID may be configured in at least one of the target RS, target channel, and reference RS (e.g., DL RS resource configuration or spatial relationship information).

(Simultaneous multi-panel transmission)
In one or more of the transmission methods/modes described above, multi-panel UL transmission (e.g., Simultaneous Transmission across Multiple Panels (STxMP)) for scheduling a PUSCH based on one DCI (single DCI)/scheduling a PUSCH based on multiple DCIs (multiple DCIs) is being considered.

In simultaneous multi-panel transmission (STxMP) in a single DCI-based multi-TRP system, the following scheme may be applied to UL transmission (e.g., PUSCH).
Space Division Multiplexing (SDM): Different layers/DMRS ports of one PUSCH are precoded separately and transmitted simultaneously from different UE beams/panels (see Figures 3A and 3B).
SDM repetition scheme: Two PUSCH transmission opportunities with different redundancy versions (RVs) of the same TB are transmitted simultaneously from two different UE beams/panels on the same time and frequency resources (see Figure 3C).
Frequency Division Multiplexing (FDM)-A scheme: Different portions of the frequency domain resources of one PUSCH transmission occasion (eg, one PUSCH transmission occasion) are transmitted from different UE beams/panels (see FIG. 4A).
FDM-B scheme: Two PUSCH transmission opportunities with the same/different RVs of the same TB are transmitted from different UE beams/panels on non-overlapping frequency domain resources and the same time domain resources (see Figure 4B).
SFN-based transmission scheme: all the same layers/DMRS ports of one PUSCH are transmitted simultaneously from two different UE beams/panels (see Figure 4C).

In this disclosure, repeated transmission and transmission may be interpreted interchangeably. Transmitting multiple TBs may mean transmitting the same TB multiple times or transmitting different TBs.

[Space division multiplexing (SDM)]
The UE may assume that repeated PUSCH transmissions employing Space Division Multiplexing (SDM) are scheduled on the same time and frequency resources, i.e., when using coherent panels, the UE may transmit repeated PUSCH transmissions employing SDM on the same time and frequency resources.

Figure 3A shows an example of repeated transmission using SDM in one CW. In Figure 3A, the time and frequency resources of layers #1-2 and #3-4 corresponding to PUSCH/PUCCH are the same.

Figure 3B shows an example of repeated transmission using SDM in two CWs. In Figure 3B, the time and frequency resources of CW #1 and CW #2 corresponding to PUSCH/PUCCH are the same.

Figure 3C shows an example of repeated transmission using SDM. In Figure 3C, the time and frequency resources for PUSCH/PUCCH repetition #1 and repetition #2 are the same.

In addition, PUSH transmission using SDM (e.g., repeated PUSH transmission) may be configured so that at least a portion of the time and frequency resources overlap.

[Frequency division multiplexing (FDM)]
The UE may assume that repeated PUSCH/PUCCH transmissions employing Frequency Division Multiplexing (FDM) are scheduled on the same time resources but different frequency resources, i.e., when using coherent panels, the UE may transmit repeated PUSCH/PUCCH transmissions employing FDM on the same time resources but different frequency resources.

Figure 4A shows a first example of repeated transmission using FDM (FDM-A). Figure 4A shows an example in which one PUSCH/PUCCH repeated transmission is performed per TB/UCI.

Figure 4B shows a second example of repeated transmission using FDM (FDM-B). Figure 4B shows an example in which PUSCH/PUCCH repeated transmission is performed twice per TB/UCI.

Figure 4C shows an example of repeated transmission using a single frequency network (SFN). Figure 4C shows an example in which one PUSCH/PUCCH is transmitted using a different beam/panel for one TB/UCI.

As shown in Figures 3A and 3B, when simultaneous multi-panel transmission based on spatial division multiplexing (STxMP SDM scheme) is performed for non-codebook PUSH transmission, different layers/DMRS ports of one PUSH can be precoded separately and transmitted simultaneously from different UP panels.

For simultaneous multi-panel transmission based on spatial division multiplexing of non-codebook-based PUSH, the following two options are considered for SRI indication (e.g., SRI indication):

<Option 1>
One SRI combination (e.g., one SRI combination) may be instructed from non-codebook SRS resources across two panels (e.g., NCB SRS resources across two panels).

<Option 2>
Multiple (e.g., two) SRS combinations (e.g., two SRI combinations) may be indicated, and each SRI combination may be indicated from non-codebook SRS resources of one panel (e.g., NCB SRS resources of one panel).

An SRI combination may include one or more SRS resources (e.g., SRS resources for non-codebooks). For example, one SRI combination (or SRI field) may indicate the SRI/SRS resources corresponding to each panel. An SRI combination may also be referred to as an SRI set or an SRI group.

As an aspect of UL transmission in Rel. 18 and beyond, it is also assumed that one or both of the following restrictions will be applied: the number of layers across two panels will be limited to a maximum of X layers, and no new codebooks will be introduced. X may be, for example, 4. Of course, the value of X is not limited to 4 and may be other values.

In this case, the question arises as to how to apply/set the SRI field.

As an example, in Option 1, the question is whether to reuse the SRI field of an existing system (e.g., Rel. 15/16/17) or extend the SRI field based on the SRI field of the existing system. If extending, the question is how to extend it. Or, as another example, in Option 2, the question is how to indicate a combination of multiple (e.g., two) SRIs.

The inventors of the present invention studied UL transmission control (e.g., SRI indication method/SRS resource setting, etc.) when simultaneous transmission using multiple panels is supported, and came up with the present embodiment.

Embodiments of the present disclosure will be described in detail below with reference to the drawings. The wireless communication methods according to the embodiments may be applied independently or in combination.

In this disclosure, "A/B" and "at least one of A and B" may be interpreted interchangeably. Also, in this disclosure, "A/B/C" may mean "at least one of A, B, and C."

In this disclosure, terms such as activate, deactivate, indicate (or indicate), select, configure, update, and determine may be read interchangeably. In this disclosure, terms such as support, control, controllable, operate, and operate may be read interchangeably.

In the present disclosure, Radio Resource Control (RRC), RRC parameters, RRC messages, higher layer parameters, fields, information elements (IEs), settings, etc. may be interchangeable. In the present disclosure, Medium Access Control control elements (MAC Control Elements (CEs)), update commands, activation/deactivation commands, etc. may be interchangeable.

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

In the present disclosure, MAC signaling may use, for example, a MAC Control Element (MAC CE), a MAC Protocol Data Unit (PDU), etc. Broadcast information may be, for example, a Master Information Block (MIB), a System Information Block (SIB), Remaining Minimum System Information (RMSI), Other System Information (OSI), etc.

In the present disclosure, physical layer signaling may be, for example, Downlink Control Information (DCI), Uplink Control Information (UCI), etc.

In this disclosure, the terms index, identifier (ID), indicator, resource ID, etc. may be interchangeable. In this disclosure, the terms sequence, list, set, group, cluster, subset, etc. may be interchangeable.

In the present disclosure, the terms panel, UE panel, panel group, beam, beam group, precoder, Uplink (UL) transmitting entity, Transmission/Reception Point (TRP), base station, Spatial Relation Information (SRI), spatial relation, SRS Resource Indicator (SRI), Control Resource Set (CONTROLLER RESOLUTION 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 Relation Group, Code Division Multiplexing (CDM) Group, Reference Signal Group, CORESET Group, Physical Uplink Control Channel (PUCCH) group, PUCCH resource group), resource (e.g., reference signal resource, SRS resource), resource set (e.g., reference signal resource set), CORESET pool, 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 assumption, etc. may be read as interchangeable.

In addition, the spatial relationship information identifier (ID) (TCI state ID) and spatial relationship information (TCI state) may be interpreted interchangeably. "Spatial relationship information" may be interpreted interchangeably as "set of spatial relationship information," "one or more pieces of spatial relationship information," etc. The TCI state and TCI may be interpreted interchangeably.

(Wireless communication method)
The UE controls transmission of PUSCHs (e.g., NCB PUSCHs) simultaneously transmitted from multiple panels using spatial division multiplexing, based on the SRI indicated in the DCI. The specific SRS resource indicated in the SRI may be selected from one or more candidate SRS resources previously configured by higher layer parameters.

The UE may receive configuration information regarding SRS resources. The configuration information regarding SRS resources may be configured commonly for multiple (e.g., two) panels, or may be configured separately. The configuration information regarding SRS resources may be an SRS resource set or a list of SRI resources.

When simultaneous multi-panel transmission using spatial division multiplexing (e.g., STxMP SDM scheme) is indicated/configured, SRI/SRS resources corresponding to each panel may be indicated by one SRI combination. The specific SRI (or SRS resource) indicated by the one SRI combination may be selected from one or more SRS resource candidates configured in common for multiple panels. In other words, SRS resource candidates/SRS resource sets may be configured in common for multiple panels (or SRS resource candidates may be configured regardless of panel index).

When simultaneous multi-panel transmission using spatial division multiplexing (e.g., STxMP SDM scheme) is indicated/configured, SRI/SRS resources corresponding to each panel may be indicated by multiple (e.g., two) SRI combinations. The specific SRI (or SRS resource) indicated in each SRI combination may be selected from one or more candidate SRS resources configured for one panel. In other words, candidate SRS resources/SRS resource sets may be configured separately for multiple panels.

The following explanation uses an example in which two beams/panels/TRPs are used (e.g., simultaneous UL transmission using two panels), but the number of applicable beams/panels/TRPs is not limited to this. This embodiment may also be similarly applied when applying three or more beams/panels/TRPs.

In the following description, panels may be read as beams/SRIs/TCIs/UE capability value sets (e.g., UE capability value sets)/SRS resources/SRS resource sets/TRPs. The first/second panels may refer to the first/second beams/SRIs/SRI fields/TCIs/TCI fields/UE capability value sets/SRS resources/SRS resource sets/TRPs. Alternatively, the first/second panels may refer to UE capability value sets with lower/higher indexes, SRS resources with lower/higher IDs, SRS resource sets with higher/lower IDs, or TRPs with lower/higher IDs. Alternatively, the first/second panels may refer to SRS resources/SRS resource sets with fewer/more ports.

Furthermore, the following description uses an example of UL transmission based on a non-codebook (e.g., PUSCH transmission based on SRI/SRS resources for a non-codebook), but the present embodiment is not limited to this. Some or all of the aspects described below may be applied to UL transmission based on a codebook (e.g., PUSCH transmission based on SRI/SRS resources for a codebook).

In addition, the following description assumes that UL transmissions corresponding to each panel (e.g., PUSHs simultaneously transmitted from each panel using spatial division multiplexing) are scheduled using one DCI, but this is not limited to this.

Furthermore, in the following description, the application of transmission using spatial division multiplexing (SDM) may be indicated by higher layer parameters/DCI.

For example, a transmission scheme (e.g., SDM scheme/other scheme) may be configured in the UE by higher layer parameters. Alternatively, the transmission scheme may be indicated to the UE by DCI. Alternatively, two beams (SRI/TCI states)/panels may be indicated to the UE by DCI. Alternatively, two SRI fields/TCI fields may be indicated by DCI. Alternatively, two CB/NCB SRS resource sets may be configured. Alternatively, DMR ports in two or more CDM groups may be indicated by DCI.

First Embodiment
The first embodiment describes the number of SRS resources that can be set for each panel when simultaneous multi-panel transmission using space division multiplexing (for example, STxMP SDM scheme) is supported.

In the first embodiment, a case where one SRI combination (e.g., one SRI combination) is indicated/set/applied will be described. The SRI combination may indicate a specific SRS resource from among SRS resources across multiple (e.g., two) panels. The SRS resource may be a non-codebook SRS resource (e.g., an NCB SRS resource).

For example, one SRI field included in the DCI may indicate an SRI combination (e.g., two or more SRI/SRS resources, or SRI/SRS resources corresponding to each panel). In this case, the multiple SRS resource candidates indicated by the SRI field may be set commonly to multiple panels, or may be set regardless of the panel.

When simultaneous multi-panel transmission based on spatial division multiplexing is indicated/configured/supported, a predetermined combination/association of the maximum rank and the number of SRS resources for two panels may be defined/configured. Furthermore, based on the predetermined combination/association, the SRS resources (or the number of SRS resources) to be configured for each panel for each maximum rank may be determined. The maximum rank (maxRank) may be the maximum number of ranks (or the maximum number of layers) that can be supported when using multiple panels (or the STxMP SDM scheme).

The UE may expect/assume that the SRS resources corresponding to each panel will be indicated from the combination/association of the maximum rank and the number of SRS resources corresponding to the two panels.

At least one of the following options 1-1 to 1-3 may be applied as a combination/association of the maximum rank and the number of SRS resources corresponding to the two panels.

[Option 1-1]
The total number of SRS resources of the two panels is set to a maximum X or less. Also, the total number of SRS resources of the two panels is set to a maximum rank or more (or the same as or more than the maximum rank). X may be, for example, 4. Of course, the value of X is not limited to 4.

The maximum rank and the number of SRS resources may be defined/configured depending on the UE capabilities. For example, the maximum total number of SRS resources for the two panels may be determined based on the maximum number of layers reported as UE capability information. The maximum rank may correspond to the sum of the ranks of the two panels.

Figure 5 shows an example of a combination/association of maximum rank and the number of SRS resources corresponding to each panel.

The number of SRS resources corresponding to each panel may be the number of SRS resources that can be configured (or associated) with each panel. The base station may configure/activate information about the SRS resources corresponding to each panel in the UE using RRC parameters/MAC CE.

The number of SRS resources corresponding to each panel in Figure 5 means the number of SRS resources set by the RRC parameters, and may be different from the number of SRS resources used for PUSH transmission indicated in the SRI field of the DCI. As an example, if rank = 3 and the total number of SRS resources corresponding to each panel is 4 (e.g., the number of SRS resources for the first panel is 3 and the number of SRS resources for the second panel is 1), three of the four SRS resources may be indicated by the SRI field.

In Figure 5, the number of SRS resources for each panel (or the number of SRS resources that can be set for each panel) is defined for each maximum rank. Here, candidates (or entries) are defined for which the total number of SRS resources for each panel is equal to or greater than the maximum rank. The combination/association (which may be called a table) of the maximum rank and the number of SRS resources for each panel shown in Figure 5 may be defined in the specifications or may be set in the UE by higher layer signaling.

For the same maximum rank value, multiple candidates for the number of SRS resources for each panel may be defined. Here, two candidates are defined for a maximum rank of 4, three candidates for a maximum rank of 3, and four candidates for a maximum rank of 2. Of course, the number of candidates defined for each maximum rank is not limited to this.

Figure 5 shows a case where the number of SRS resources that can be set on the first panel is equal to or greater than the number of SRS resources that can be set on the second panel, but this is not limited to this. Furthermore, the number of SRS resources on the first panel and the number of SRS resources on the second panel may be switched (or switched).

Figure 5 shows a case where the number of SRS resources corresponding to the first panel (or configurable) is different from the number of SRS resources corresponding to the second panel, but this is not limited to this. The number of SRS resources corresponding to the first panel may be the same as the number of SRS resources corresponding to the second panel. In this case, only a predetermined value (e.g., {2, 4}) may be supported as the maximum rank.

[Option 1-2]
The number of SRS resources in each panel is set to a maximum Y or less. The total number of SRS resources in the two panels is set to a maximum rank or greater (or equal to or greater than the maximum rank). Y may be, for example, 2. Of course, the value of Y is not limited to 2.

The maximum rank and the number of SRS resources may be defined/configured depending on the UE capabilities. For example, the maximum total number of SRS resources for the two panels may be determined based on the maximum number of layers reported as UE capability information. The maximum rank may correspond to the sum of the ranks of the two panels.

Figure 6 shows an example of a combination/association of maximum rank and the number of SRS resources corresponding to each panel.

The number of SRS resources corresponding to each panel may be the number of SRS resources that can be configured (or associated) with each panel. The base station may configure/activate information about the SRS resources corresponding to each panel in the UE using RRC parameters/MAC CE.

The number of SRS resources corresponding to each panel in Figure 6 means the number of SRS resources set by the RRC parameters, and may be different from the number of SRS resources used for PUSH transmission indicated in the SRI field of the DCI. As an example, if rank = 3 and the total number of SRS resources corresponding to each panel is 4 (e.g., the number of SRS resources for the first panel is 2 and the number of SRS resources for the second panel is 2), three of the four SRS resources may be indicated by the SRI field.

In Figure 6, the number of SRS resources for each panel (or the number of SRS resources that can be set for each panel) is defined for each maximum rank. Here, candidates (or entries) are defined for which the total number of SRS resources for each panel is equal to or greater than the maximum rank. The combination/association (which may be called a table) of the maximum rank and the number of SRS resources for each panel shown in Figure 6 may be defined in the specifications or may be set in the UE by higher layer signaling.

For the same maximum rank value, multiple candidates for the number of SRS resources for each panel may be defined. Here, one candidate is defined for a maximum rank of 4, two candidates for a maximum rank of 3, and three candidates for a maximum rank of 2. Of course, the number of candidates defined for each maximum rank is not limited to this.

Figure 6 shows a case where the number of SRS resources that can be set on the first panel is equal to or greater than the number of SRS resources that can be set on the second panel, but this is not limited to this. Furthermore, the number of SRS resources on the first panel and the number of SRS resources on the second panel may be switched (or switched).

Figure 6 shows a case where the number of SRS resources corresponding to the first panel (or configurable) is different from the number of SRS resources corresponding to the second panel, but this is not limited to this. The number of SRS resources corresponding to the first panel may be the same as the number of SRS resources corresponding to the second panel. In this case, only a predetermined value (e.g., {2, 4}) may be supported as the maximum rank.

[Options 1-3]
The number of SRS resources in each panel is set to a maximum of Z or less. The total number of SRS resources in the two panels is set to a maximum rank or greater (or equal to or greater than the maximum rank). Z may be, for example, 4. Of course, the value of Z is not limited to 4.

The maximum rank and the number of SRS resources may be defined/configured depending on the UE capabilities. For example, the maximum total number of SRS resources for the two panels may be determined based on the maximum number of layers reported as UE capability information. The maximum rank may correspond to the sum of the ranks of the two panels.

Figure 7 shows an example of a combination/association of maximum rank and the number of SRS resources corresponding to each panel.

The number of SRS resources corresponding to each panel may be the number of SRS resources that can be configured (or associated) with each panel. The base station may configure/activate information about the SRS resources corresponding to each panel in the UE using RRC parameters/MAC CE.

The number of SRS resources corresponding to each panel in Figure 7 means the number of SRS resources set by the RRC parameters, and may be different from the number of SRS resources used for PUSH transmission indicated in the SRI field of the DCI. As an example, if rank = 3 and the total number of SRS resources corresponding to each panel is 8 (e.g., the number of SRS resources in the first panel is 4 and the number of SRS resources in the second panel is 4), three of the eight SRS resources may be indicated by the SRI field.

In Figure 7, the number of SRS resources for each panel (or the number of SRS resources that can be set for each panel) is defined for each maximum rank. Here, candidates (or entries) are defined where the total number of SRS resources for each panel is equal to or greater than the maximum rank. The combination/association (which may be called a table) of the maximum rank and the number of SRS resources for each panel shown in Figure 7 may be defined in the specifications or may be set in the UE by higher layer signaling.

Multiple candidates for the number of SRS resources for each panel may be defined for the same maximum rank value.

The number of SRS resources on the first panel and the number of SRS resources on the second panel may be switched (or altered).

Figure 7 shows a case where the number of SRS resources corresponding to the first panel (or configurable) is different from the number of SRS resources corresponding to the second panel, but this is not limited to this. The number of SRS resources corresponding to the first panel may be the same as the number of SRS resources corresponding to the second panel. In this case, only a predetermined value (e.g., {2, 4}) may be supported as the maximum rank.

Second Embodiment
The second embodiment describes an indication by SRI combination (e.g., SRI combination) when simultaneous multi-panel transmission based on a space division multiplexing scheme (e.g., STxMP SDM scheme) is supported. The second embodiment may be applied in combination with the first embodiment.

In the second embodiment, a case where one SRI combination (e.g., one SRI combination) is indicated/set/applied will be described. The SRI combination may indicate a predetermined SRS resource (or a predetermined number of SRS resources) from SRS resources across multiple (e.g., two) panels. The SRS resource may be a non-codebook SRS resource (e.g., an NCB SRS resource).

A specific SRS resource (or SRS resource identifier) may be indicated to the UE using the SRS resource indication field included in the DCI and an SRI indication table for non-codebook PUSCH (e.g., NCB PUSCH). The SRI indication table (or SRI table) may be interpreted as an association between the value (or codepoint) of the SRS resource indication field and the SRI.

[Option 2-1]
In Option 1-1/Option 1-2 of the first embodiment, a predetermined SRI (or SRS resource) may be indicated to the UE by utilizing an existing SRS resource indication field and an existing SRI indication table (e.g., by utilizing a part of a code point/table).

If simultaneous multi-panel transmission based on spatial division multiplexing (e.g., STxMP SDM scheme) is indicated/configured, the SRI indication table may be applied, with the number of SRS resources being the total number of SRS resources across the two panels.

Assume that the number of SRS resources on the first panel is N and the number of SRS resources on the second panel is M. In this case, in the SRIs in the SRI indication table, SRI0, 1..., N-1 may refer to the SRS resources on the first panel, and the remaining SRIs (e.g., SRIN, N+1,..., N+M-1) may refer to the SRS resources on the second panel. Alternatively, in the SRIs in the SRI indication table, SRI0, 2... may refer to the SRS resources on the first panel, and the remaining SRIs (e.g., SRI1, 3,...) may refer to the SRS resources on the second panel.

At least one of N and M may be set by an RRC parameter or defined in a specification. At least one of N and M may be determined by a floor function. For example, N may be determined by floor (number of SRS resources/2). Alternatively, N may be determined by ceiling (number of SRS resources/) and M may be determined by floor (number of SRS resources/2).

8 to 10 show examples of associations (tables) between an index indicated by the SRI field (SRI field index/SRI index) and one or more SRIs (SRS resource IDs) for NCB-based PUSCH transmission. Fig. 8 corresponds to the case where L _max =2, Fig. 9 corresponds to the case where L _max =3, and Fig. 10 corresponds to the case where L _max =4.

N _SRS is the number of SRS resources in the SRS resource set configured by the SRS resource set list (srs-ResourceSetToAddModList) and associated with non-codebook usage. If the STxMP SDM scheme is indicated/configured, N _SRS may be assumed to be the total number of SRS resources across multiple panels.

If the UE supports operation with an upper layer parameter maxMIMO-Layers indicating the maximum number of Multi-Input Multi-Output (MIMO) layers, and the upper layer parameter maxMIMO-Layers is configured, _Lmax is given by that parameter. Otherwise, _Lmax may be given by the maximum number of layers for PUSCH supported by the UE.

8 to 10, when N _SRS =2, SRI0 may correspond to the first panel and SRI1 may correspond to the second panel. When N _SRS =3, SRI0 may correspond to the first panel and SRI1/2 may correspond to the second panel. When _{N SRS} =4, SRI0/1 may correspond to the first panel and SRI2/3 may correspond to the second panel. Of course, the correspondence between SRI and the first panel/second panel is not limited to this, and the first panel and the second panel may be swapped, or another correspondence may be applied.

When simultaneous multi-panel transmission based on spatial division multiplexing (e.g., STxMP SDM scheme) is indicated/configured, only the part where multiple SRIs (or combinations of SRIs) are defined may be applied. For example, in FIG. 8, when N _SRS = 2, SRI field index 2 (SRI: 0, 1) may be applied; when N _SRS = 3, SRI field indexes 3 (SRI: 0, 1) and 4 (SRI: 0, 2) may be applied; and when N _SRS = 4, SRI field indexes 5 (SRI: 0, 2), 6 (SRI: 0, 3), 7 (SRI: 1, 2), and 8 (SRI: 1, 3) may be applied.

Two or more SRIs (or SRI combinations) corresponding to each code point may be indicated from SRS resources set in common for the two panels.

In this way, in the SRI table of an existing system (e.g., Rel. 17), bit fields (code points) in which SRIs corresponding to the first panel and the second panel exist may be selectively applied.

For example, when the STxMP SDM scheme is indicated/configured, an SRI that includes only SRS resources from a single panel (or an SRI combination that indicates only SRS resources corresponding to a single panel) may not be used. For example, when the STxMP SDM scheme is indicated/configured, the UE may expect/assume that an SRI (or a codepoint corresponding to the SRI) in which all SRS resources correspond to only a single panel (or one of the panels) will not be used. Alternatively, the UE may ignore the SRI (or the codepoint corresponding to the SRI).

Alternatively, if dynamic switching between single panel and STxMP SDM scheme is supported, the SRI indication may indicate the scheduling scheme/selected panel. For example, if an SRI having only SRS resources from a single panel (e.g., all SRS resources correspond to a single panel) is indicated, it may indicate single panel transmission. The UE may determine the transmission type (e.g., single panel transmission/multiple panel transmission (STxMP SDM scheme)) from the SRI indication.

When the STxMP SDM scheme is indicated/configured, the SRI corresponding to a specified rank may not be applied. The specified rank may be, for example, rank = 1 (or number of SRS resources = 1). The UE may expect/assume that when the STxMP SDM scheme is indicated/configured, the SRI corresponding to a specified rank will not be applied (or may ignore the SRI corresponding to the specified rank).

Alternatively, if dynamic switching between single panel and STxMP SDM scheme is supported, the SRI indication may indicate the scheduling scheme/selected panel. For example, if an SRI with rank = 1 (e.g., number of SRS resources = 1) is indicated, it may indicate single panel transmission. The UE may determine the transmission type (e.g., single panel transmission/multiple panel transmission (STxMP SDM scheme)) based on the SRI indication.

Note that Figures 8-10 show the case where the SRI indication table of an existing system (e.g., Rel. 17) is used, but this is not limited to this. A new SRI indication field in which an SRI corresponding to the first panel and an SRI corresponding to the second panel are associated with each code point in the SRI field may also be applied.

When a new SRI indication table is introduced, the SRI indication table of the existing system and the new SRI indication table may be switched and applied. Switching between the SRI indication table of the existing system and the new SRI indication table may be controlled based on RRC parameters/DCI. For example, table switching may be controlled based on at least one of whether or not a specific RRC parameter is set and the RNTI used for CRC scrambling of DCI.

[Option 2-2]
In Option 1-3 of the first embodiment, a predetermined SRI (or SRS resource) may be indicated to the UE using a new SRI indication table applied to PUSCH (e.g., NCB PUSCH) transmission. Note that Option 2-2 may be applied to Option 1-1/Option 1-2 of the first embodiment.

The new SRI instruction table may be a table that supports cases where the total number of SRS resources across two panels is greater than four.

Assume that the number of SRS resources on the first panel is N and the number of SRS resources on the second panel is M. In this case, in the SRIs in the SRI indication table, SRI0, 1..., N-1 may refer to the SRS resources on the first panel, and the remaining SRIs (e.g., SRIN, N+1,..., N+M-1) may refer to the SRS resources on the second panel. Alternatively, in the SRIs in the SRI indication table, SRI0, 2... may refer to the SRS resources on the first panel, and the remaining SRIs (e.g., SRI1, 3,...) may refer to the SRS resources on the second panel.

When the STxMP SDM scheme is indicated/configured, an SRI that includes only SRS resources from a single panel (or an SRI combination that indicates only SRS resources corresponding to a single panel) may be configured not to be used. For example, when the STxMP SDM scheme is indicated/configured, the UE may expect/assume that an SRI (or a codepoint corresponding to the SRI) in which all SRS resources correspond to only a single panel (or one of the panels) will not be used. Alternatively, the UE may ignore the SRI (or the codepoint corresponding to the SRI).

Alternatively, if dynamic switching between single panel and STxMP SDM scheme is supported, the SRI indication may indicate the scheduling scheme/selected panel. For example, if an SRI having only SRS resources from a single panel (e.g., all SRS resources correspond to a single panel) is indicated, it may indicate single panel transmission. The UE may determine the transmission type (e.g., single panel transmission/multiple panel transmission (STxMP SDM scheme)) from the SRI indication.

When the STxMP SDM scheme is indicated/configured, the SRI corresponding to a specified rank may not be applied. The specified rank may be, for example, rank = 1 (or number of SRS resources = 1). The UE may expect/assume that when the STxMP SDM scheme is indicated/configured, the SRI corresponding to a specified rank will not be applied (or may ignore the SRI corresponding to the specified rank).

Alternatively, if dynamic switching between single panel and STxMP SDM scheme is supported, the SRI indication may indicate the scheduling scheme/selected panel. For example, if an SRI with rank = 1 (e.g., number of SRS resources = 1) is indicated, it may indicate single panel transmission. The UE may determine the transmission type (e.g., single panel transmission/multiple panel transmission (STxMP SDM scheme)) based on the SRI indication.

When a new SRI indication table is introduced, the SRI indication table of the existing system and the new SRI indication table may be switched and applied. Switching between the SRI indication table of the existing system and the new SRI indication table may be controlled based on RRC parameters/DCI. For example, table switching may be controlled based on at least one of whether or not a specific RRC parameter is set and the RNTI used for CRC scrambling of DCI.

Third Embodiment
The third embodiment describes the number of SRS resources that can be set for each panel when simultaneous multi-panel transmission based on space division multiplexing (for example, STxMP SDM scheme) is supported.

In the third embodiment, a case where two SRI combinations (e.g., one SRI combination) are indicated/configured/applied is described. Each SRI combination may indicate one or more SRI/SRS resources of a corresponding panel from among the SRS resources of a panel (or candidate SRS resources corresponding to a panel). The SRS resources may be non-codebook SRS resources (e.g., NCB SRS resources).

For example, one or two fields (e.g., SRI fields) included in the DCI may indicate the SRI/SRS resources corresponding to each panel. In this case, the SRS resource candidates that can be indicated by each SRI combination may be configured separately for each panel. For example, multiple SRS resource candidates (or SRS resource sets) that can be indicated by a first SRS combination (or first field) and multiple SRS resource candidates that can be indicated by a second SRS combination (or second field) may be configured separately by RRC parameters.

When simultaneous multi-panel transmission based on spatial division multiplexing is indicated/configured/supported, a predetermined combination/association of the maximum rank and the number of SRS resources for two panels may be defined/configured. Furthermore, based on the predetermined combination/association, the SRS resources (or the number of SRS resources) to be configured for each panel for each maximum rank may be determined. The maximum rank (maxRank) may be the maximum number of ranks (or the maximum number of layers) that can be supported when using multiple panels (or the STxMP SDM scheme).

The UE may expect/assume that the SRS resources corresponding to each panel will be indicated based on the combination/association of the maximum rank and the number of SRS resources corresponding to the two panels.

At least one of options 1-1 to 1-3 shown in the first embodiment may be applied as a combination/association of the maximum rank and the number of SRS resources corresponding to the two panels.

The third embodiment differs from the first embodiment in that the SRI/SRS resources corresponding to each panel are indicated by two SRI combinations (or two SRI fields each containing an SRI combination). The configuration shown in the first embodiment (at least one of Option 1-1 to Option 1-3) may be applied to the number of SRS resources for each panel corresponding to the maximum rank (or the number of SRS resources for each panel that can be set for each maximum rank).

<Fourth embodiment>
The fourth embodiment describes indication of SRI/SRS resources corresponding to each panel when simultaneous multi-panel transmission based on space division multiplexing (e.g., STxMP SDM scheme) is supported. The fourth embodiment may be applied in combination with the third embodiment.

In the fourth embodiment, a case will be described in which two SRI combinations (e.g., two SRI combinations) are indicated/configured/applied. Each SRI combination may indicate one or more SRI/SRS resources of a corresponding panel from among the SRS resources of one panel (or candidate SRS resources corresponding to one panel). Furthermore, each SRI combination may include one or more SRI/SRI resources.

One or more fields (e.g., fields included in the DCI) may apply to the two SRI combinations.

[Option 4-1]
Multiple (e.g., two) DCI fields may be provided in the DCI to indicate the SRI of each panel. When the STxMP SDM scheme is indicated/configured, the first DCI field may indicate one or more SRIs corresponding to a first panel, and the second DCI field may indicate one or more SRIs corresponding to a second panel.

The indicated SRI (or SRS resource) may represent a rank. The UE may assume that the number of SRS resources corresponding to the indicated SRI corresponds to the rank (or may determine the rank based on the number of SRS resources corresponding to the SRI).

[Option 4-2]
The first DCI field may indicate one or more SRIs corresponding to the first panel and the rank (or layer) of the second panel, and the second DCI field may indicate one or more SRIs corresponding to the second panel.

The second DCI field may indicate an SRI (or SRS resource) corresponding to the rank indicated by the first DCI field.

[Option 4-3]
The first DCI field may indicate the rank of the first panel and the rank of the second panel, and the second DCI field may indicate one or more SRIs corresponding to the first panel and one or more SRIs corresponding to the second panel.

The second DCI field may indicate an SRI corresponding to the rank indicated by the first DCI field.

[Option 4-4]
The first DCI field may indicate the rank of the first panel and the rank of the second panel, the second DCI field may indicate one or more SRIs corresponding to the first panel, and the third DCI field may indicate one or more SRIs corresponding to the second panel.

The second DCI field/third DCI field may indicate an SRI corresponding to the rank indicated by the first DCI field, respectively.

[Options 4-5]
One DCI field may indicate one or more SRIs corresponding to a first panel and one or more SRIs corresponding to a second panel. In this case, the indicated SRI may indicate a rank. That is, the number of SRS resources corresponding to the indicated SRI may indicate the rank.

[Variation]
The DCI field indicates the sum of the ranks of the first panel and the second panel, and the ranks of the first panel and the second panel may be determined from the sum based on a predetermined rule. For example, if the sum is an even number, the UE may assume that the rank corresponding to the first panel and the rank corresponding to the second panel are the same. If the sum is an odd number, the UE may assume that one of the ranks corresponding to the first panel and the second panel (e.g., the rank of the first panel) is higher (e.g., one rank higher) than the other.

The rank indication by the DCI field may indicate a combination of the ranks of the first panel and the second panel. For example, at least one of Alt. 4-1 to Alt. 4-2 below may be applied.

《Alt. 4-1》
When the STxMP SDM scheme is assumed (or when only the STxMP SDM scheme is considered), a specific rank combination may be indicated from predetermined rank combination candidates. The predetermined rank combination candidates may be, for example, {(1,1), (1,2), (2,1), (2,2), (3,1), (1,3)}. The UE may determine the rank corresponding to the first panel and the rank corresponding to the second panel based on the rank indication information.

Alt. 4-2
If dynamic switching between single panel transmission (e.g., single panel TX) and STxMP SDM is supported, a combination indication (or DCI field indication) may be used to indicate a rank combination for single panel transmission or STxMP SDM. The combination indication may indicate a specific rank combination from a predetermined rank combination candidate.

If switching between single panel transmission by a first panel (e.g., single panel Tx with ^1st panel) and single panel transmission by a second panel (e.g., single panel Tx with ^2nd panel) is not supported, the predetermined rank combination candidates may be {(1,1), (1,2), (2,1), (2,2), (3,1), (1,3), (1,0), (2,0), (3,0), (4,0)}, where (a,0) may correspond to single panel transmission.

If switching between single-panel transmission by the first panel and single-panel transmission by the second panel is supported, the predetermined rank combination candidates may be {(1,1), (1,2), (2,1), (2,2), (3,1), (1,3), (1,0), (0,1), (2,0), (0,2), (3,0), (0.3), (4,0), (0,4)}, where (a,0) may correspond to single-panel transmission by the first panel and (0,b) may correspond to single-panel transmission by the second panel.

In Alt. 4-1/Alt. 4-2, (a, b) may mean that the rank of the first panel is a and the rank of the second panel is b.

Also, (1,3) and (3,1) may not be supported, or may be supported depending on UE capabilities.

In Alt. 4-1/Alt. 4-2, which combinations (or how many combinations) are valid for the DCI indication may be configured/instructed by the RRC/MAC CE or may be determined based on the UE capabilities.

In Alt. 4-2, which combinations of (1,0), (0,1), (2,0), (0,2), (3,0), (0.3), (4,0), and (0,4) are supported may depend on the UE capabilities or the RRC settings regarding the maximum rank of single panel transmission.

Assume that the STxMP SDM scheme is specified/configured and the maximum rank of the STxMP SDM (or, if multiple panels are used) is X. In this case, at least one of Alt. 4A-1 to Alt. 4A-3 below may be applied to one or more SRIs corresponding to the first panel.

《Alt. 4A-1》
One or more SRIs corresponding to the first panel may be indicated from the SRIs with rank={1, 2, . . . , X}.

《Alt. 4A-2》
One or more SRIs corresponding to the first panel may be indicated from the SRIs with rank={1, 2, . . . , X-1}.

《Alt. 4A-3》
The one or more SRIs corresponding to the first panel may be indicated from the SRIs having rank={1, 2,...,X/2} or rank={1, 2,...,floor(X/2)} or rank={1, 2,...,ceiling(X/2)}.

Assume that the STxMP SDM scheme is specified/configured, the maximum rank of the STxMP SDM (or, if multiple panels are used, the maximum rank of the STxMP SDM) is X, and the rank of the first panel is Y. In this case, at least one of Alt. 4B-1 to Alt. 4B-4 below may be applied to one or more SRIs corresponding to the second panel.

《Alt. 4B-1》
Regardless of the rank of the first panel, one or more SRIs corresponding to the second panel may be indicated from an SRI with rank = {1, 2,...,X}. On the other hand, the UE may not expect/assume that the sum of the ranks indicated for the two panels will be greater than X.

《Alt. 4B-2》
Regardless of the rank of the first panel, one or more SRIs corresponding to the second panel may be indicated from an SRI with rank = {1, 2,..., X-1}, while the UE may not expect/assume that the sum of the ranks indicated for the two panels will be greater than X.

《Alt. 4B-3》
Regardless of the rank of the first panel, one or more SRIs corresponding to the second panel may be indicated from an SRI having rank={1, 2,...,X/2} or rank={1, 2,...,floor(X/2)} or rank={1, 2,...,ceiling(X/2)}.

《Alt. 4B-4》
Based on the rank of the first panel, one or more SRIs corresponding to the second panel may be indicated from the SRIs having rank={1, 2, . . . , XY}.

If Alt. 4A-2 is applied to the first panel and Alt. 4B-4 is applied to the second panel, the rank of each panel may be determined as follows:

Case 4-1
Assume that the maximum rank is 4, the number of SRS resources (e.g., NCB SRS resources to be set) of the first panel is 4, and the number of SRS resources (e.g., NCB SRS resources to be set) of the second panel is 4.

In this case, the SRI corresponding to the first panel is indicated by rank = 1/2/3.

When rank = 1 is indicated for the first panel, the SRI corresponding to the second panel is indicated from rank = 1/2/3.

If rank = 2 is specified for the first panel, the SRI corresponding to the second panel is specified from rank = 1/2.

If rank = 3 is indicated for the first panel, the SRI corresponding to the second panel is indicated from rank = 1.

Case 4-2
Assume that the maximum rank is 4, the number of SRS resources in the first panel is 4, and the number of SRS resources in the second panel is 2.

In this case, the SRI corresponding to the first panel is indicated by rank = 1/2/3.

When rank = 1 is indicated for the first panel, the SRI corresponding to the second panel is indicated from rank = 1/2.

If rank = 2 is specified for the first panel, the SRI corresponding to the second panel is specified from rank = 1/2.

If rank = 3 is indicated for the first panel, the SRI corresponding to the second panel is indicated from rank = 1.

Case 4-3
Assume that the maximum rank is 4, the number of SRS resources in the first panel is 2, and the number of SRS resources in the second panel is 4.

In this case, the SRI corresponding to the first panel is indicated by rank = 1/2.

When rank = 1 is indicated for the first panel, the SRI corresponding to the second panel is indicated from rank = 1/2/3.

If rank = 2 is specified for the first panel, the SRI corresponding to the second panel is specified from rank = 1/2.

If rank = 3 is indicated for the first panel, the SRI corresponding to the second panel is indicated from rank = 1.

Case 4-4
Assume that the maximum rank is 4, the number of SRS resources in the first panel is 4, and the number of SRS resources in the second panel is 1.

In this case, the SRI corresponding to the first panel is indicated by rank = 1/2/3.

The SRI corresponding to the second panel is indicated from rank = 1.

Case 4-5
Assume that the maximum rank is 4, the number of SRS resources in the first panel is 1, and the number of SRS resources in the second panel is 4.

In this case, the SRI corresponding to the first panel is indicated from rank = 1.

The SRI corresponding to the second panel is indicated by rank = 1/2/3.

Case 4-6
Assume that the maximum rank is 4, the number of SRS resources in the first panel is 2, and the number of SRS resources in the second panel is 2.

In this case, the SRI corresponding to the first panel is indicated by rank = 1/2.

When rank = 1 is indicated for the first panel, the SRI corresponding to the second panel is indicated from rank = 1/2.

If rank = 2 is specified for the first panel, the SRI corresponding to the second panel is specified from rank = 1/2.

Case 4-7
The maximum rank is 3, the number of SRS resources in the first panel is 4, and the number of SRS resources in the second panel is 4, or
The maximum rank is 3, the number of SRS resources in the first panel is 4, and the number of SRS resources in the second panel is 2, or
The maximum rank is 3, the number of SRS resources in the first panel is 2, and the number of SRS resources in the second panel is 4, or
Assume that the maximum rank is 3, the number of SRS resources in the first panel is 2, and the number of SRS resources in the second panel is 2.

In this case, the SRI corresponding to the first panel is indicated by rank = 1/2.

When rank = 1 is indicated for the first panel, the SRI corresponding to the second panel is indicated from rank = 1/2.

If rank = 2 is indicated for the first panel, the SRI corresponding to the second panel is indicated from rank = 1.

Case 4-8
The maximum rank is 3, the number of SRS resources in the first panel is 4, and the number of SRS resources in the second panel is 1, or
Assume that the maximum rank is 3, the number of SRS resources in the first panel is 2, and the number of SRS resources in the second panel is 1.

In this case, the SRI corresponding to the first panel is indicated by rank = 1/2.

The SRI corresponding to the second panel is indicated from rank = 1.

Case 4-9
The maximum rank is 3, the number of SRS resources in the first panel is 1, and the number of SRS resources in the second panel is 4, or
Assume that the maximum rank is 3, the number of SRS resources in the first panel is 1, and the number of SRS resources in the second panel is 2.

In this case, the SRI corresponding to the first panel is indicated from rank = 1.

The SRI corresponding to the second panel is indicated by rank = 1/2.

Case 4-10
Assume that the maximum rank is 2.

In this case, the SRI corresponding to the first panel is indicated from rank = 1.

The SRI corresponding to the second panel is indicated from rank = 1.

In addition, for each panel, a rank of 3 (for example, when using multiple panels and the maximum rank is 4, one panel may have a rank of 3 and the other panel a rank of 1) may not be supported.

<Additional Information>
At least one of the above-described embodiments may be applied only to UEs that have reported or support a particular UE capability.

The specific UE capabilities may indicate at least one of the following:
Supporting the SDM method,
Supporting combinations of maximum rank and number of NCB SRS resources.

Furthermore, the above-mentioned specific UE capabilities may be capabilities that apply across all frequencies (commonly regardless of frequency), capabilities per frequency (e.g., one or a combination of cell, band, band combination, BWP, component carrier, etc.), capabilities per frequency range (e.g., Frequency Range 1 (FR1), FR2, FR3, FR4, FR5, FR2-1, FR2-2), capabilities per subcarrier spacing (SubCarrier Spacing (SCS)), or capabilities per Feature Set (FS) or Feature Set Per Component-carrier (FSPC).

Furthermore, the above-mentioned specific UE capabilities may be capabilities that apply across all duplexing methods (commonly regardless of the duplexing method), or may be capabilities for each duplexing method (e.g., Time Division Duplex (TDD) or Frequency Division Duplex (FDD)).

Furthermore, at least one of the above-mentioned embodiments may be applied when the UE is configured with specific information related to the above-mentioned embodiments by higher layer signaling.

If the UE does not support at least one of the above specific UE capabilities or the above specific information is not configured, the UE may apply, for example, the behavior of Rel. 15/16/17.

(Additional Note)
The following inventions are added regarding one embodiment of the present disclosure.
[Appendix 1-1]
A terminal having a receiving unit that receives configuration information regarding sounding reference signal (SRS) resources, and a control unit that controls UL transmissions transmitted from multiple panels using a space division multiplexing method based on a combination of SRS resource identifiers (SRIs) indicated in a field included in downlink control information, and in which an association is set or defined between the maximum rank supported for the UL transmission and the number of SRS resources that can be set for each panel.
[Appendix 1-2]
The terminal according to Supplementary Note 1-1, wherein the total number of SRS resources that can be set on each of the plurality of panels is equal to or greater than the corresponding maximum rank.
[Appendix 1-3]
The terminal according to Supplementary Note 1-1 or Supplementary Note 1-2, wherein when UL transmission is performed from multiple panels using the spatial division multiplexing method, the control unit determines the SRS resource corresponding to each panel by associating an index corresponding to the field defined in the existing system with an SRS resource identifier, assuming that the number of SRS resources is the total number of SRS resources across the multiple panels.
[Appendix 1-4]
The control unit assumes that when UL transmission is performed from multiple panels using the spatial division multiplexing method, an SRI that indicates only an SRS resource corresponding to one panel, or an SRI that indicates rank 1 is not indicated. A terminal described in any of Supplementary Notes 1-1 to 1-3.

[Appendix 2-1]
A terminal having a receiving unit that receives multiple setting information regarding sounding reference signal (SRS) resources, and a control unit that controls UL transmissions transmitted from multiple panels using a space division multiplexing method based on a combination of multiple SRS resource identifiers (SRIs) indicated in one or more fields included in downlink control information, and in which an association is set or defined between the maximum rank supported for the UL transmission and the number of SRS resources that can be set for each panel.
[Appendix 2-2]
A terminal described in Appendix 2-1, in which a first field included in the downlink control information indicates an SRI corresponding to a first panel and a rank of a second panel, and a second field included in the downlink control information indicates an SRI corresponding to a second panel.
[Appendix 2-3]
A terminal described in Appendix 2-1 or Appendix 2-2, in which a first field included in the downlink control information indicates the rank of the first panel and the rank of the second panel, and another field different from the first field indicates the SRI corresponding to the first panel and the SRI corresponding to the second panel.
[Appendix 2-4]
The terminal according to any one of Supplementary Note 2-1 to Supplementary Note 2-3, wherein candidates for SRS resources that can be indicated by a combination of the plurality of SRIs are set separately.

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

Figure 11 is a diagram showing an example of the schematic configuration of a wireless communication system according to one embodiment. Wireless communication system 1 (which may simply be referred to as system 1) may be a system that realizes communication using Long Term Evolution (LTE) specified by the Third Generation Partnership Project (3GPP), 5th generation mobile communication system New Radio (5G NR), or the like.

The wireless communication system 1 may also 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)), etc.

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.

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

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) that are located within the macrocell C1 and form a small cell C2 that is smaller than the macrocell C1. A user terminal 20 may be located within at least one of the cells. The location and number of each cell and user terminal 20 are not limited to the configuration shown in the figure. Hereinafter, when there is no need to distinguish between base stations 11 and 12, they will be collectively referred to as base station 10.

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).

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

In addition, the user terminal 20 may communicate using at least one of Time Division Duplex (TDD) and Frequency Division Duplex (FDD) in each CC.

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

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

The core network 30 may include network functions (Network Functions (NF)) such as, for example, a User Plane Function (UPF), Access and Mobility management Function (AMF), Session Management Function (SMF), Unified Data Management (UDM), Application Function (AF), Data Network (DN), Location Management Function (LMF), and Operation, Administration and Maintenance (Management) (OAM). Note that multiple functions may be provided by a single network node. Communication with an external network (e.g., the Internet) may also be performed via the DN.

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

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

A radio access method may also be called a waveform. In wireless communication system 1, other radio access methods (e.g., other single-carrier transmission methods, other multi-carrier transmission methods) may be used for the UL and DL radio access methods.

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

In addition, in the wireless communication system 1, an uplink shared channel (Physical Uplink Shared Channel (PUSCH)) shared by each user terminal 20, an uplink control channel (Physical Uplink Control Channel (PUCCH)), a random access channel (Physical Random Access Channel (PRACH)), etc. may be used as an uplink channel.

User data, upper layer control information, System Information Block (SIB), etc. are transmitted via PDSCH. User data, upper layer control information, etc. may also be transmitted via PUSCH. Furthermore, Master Information Block (MIB) may also be transmitted via PBCH.

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

Note that the DCI that schedules the PDSCH may be called a DL assignment, DL DCI, etc., and the DCI that schedules the PUSCH may be called an UL grant, UL DCI, etc. Note that the PDSCH may be interpreted as DL data, and the PUSCH may be interpreted as UL data.

Detection of the PDCCH may utilize a control resource set (CORESET) and a search space. The CORESET corresponds to the resources to search for DCI. The search space corresponds to the search region and search method for PDCCH candidates. One CORESET may be associated with one or more search spaces. The UE may monitor the CORESET associated with a certain search space based on the search space configuration.

One search space may correspond to PDCCH candidates corresponding to one or more aggregation levels. One or more search spaces may be referred to as a search space set. Note that the terms "search space," "search space set," "search space setting," "search space set setting," "CORESET," "CORESET setting," etc. in the present disclosure may be read interchangeably.

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

Note that in this disclosure, downlink, uplink, etc. may be expressed without the word "link." Also, various channels may be expressed without the word "Physical" at the beginning.

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, 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 as the DL-RS.

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 an SS (PSS, SSS) and a PBCH (and a DMRS for the PBCH) may be referred to as an SS/PBCH block, an SS Block (SSB), etc. Note that SS, SSB, etc. may also be referred to as a reference signal.

In addition, in the wireless communication system 1, a sounding reference signal (SRS), a demodulation reference signal (DMRS), etc. may be transmitted as an uplink reference signal (UL-RS). DMRS may also be called a user equipment-specific reference signal (UE-specific Reference Signal).

(base station)
12 is a diagram illustrating an example of the configuration of a base station according to an embodiment. The base station 10 includes a control unit 110, a transceiver unit 120, a transceiver antenna 130, and a transmission line interface 140. Note that the base station may include one or more of each of the control unit 110, the transceiver unit 120, the transceiver antenna 130, and the transmission line interface 140.

Note that this example mainly shows the functional blocks that characterize this embodiment, and the base station 10 may also have other functional blocks necessary for wireless communication. Some of the processing of each unit described below may be omitted.

The control unit 110 controls the entire base station 10. The control unit 110 can be composed of a controller, a control circuit, etc., which are described based on common understanding in the technical field related to this disclosure.

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 using the transceiver unit 120, the transceiver antenna 130, and the transmission path interface 140, measurements, etc. The control unit 110 may generate data, control information, sequences, etc. to be transmitted as signals and transfer them to the transceiver unit 120. The control unit 110 may also perform call processing of communication channels (setting up, releasing, etc.), status management of the base station 10, management of radio resources, etc.

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

The transmitter/receiver unit 120 may be configured as an integrated transmitter/receiver unit, or may be composed of a transmitter unit and a receiver unit. The transmitter unit may be composed of a transmission processing unit 1211 and an RF unit 122. The receiver unit may be composed of a reception processing unit 1212, an RF unit 122, and a measurement unit 123.

The transmitting and receiving antenna 130 may be composed of an antenna described based on common understanding in the technical field to which this disclosure relates, such as an array antenna.

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

The transceiver unit 120 may form at least one of the transmit beam and the receive beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), etc.

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

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

The transceiver unit 120 (RF unit 122) may perform modulation, filtering, amplification, etc. on the baseband signal to a radio frequency band, and transmit the radio frequency band signal via the transceiver antenna 130.

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

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

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

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

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

The transceiver 120 may transmit configuration information regarding sounding reference signal (SRS) resources. The configuration information may be one or more SRS resource candidates (or one SRS resource set) to be configured for multiple panels. The control unit 110 may control the combination of SRS resource identifiers (SRIs) to be applied to UL transmissions transmitted from multiple panels using spatial division multiplexing to be indicated using a field included in the downlink control information.

The transceiver 120 may also transmit multiple pieces of configuration information regarding sounding reference signal (SRS) resources. The multiple pieces of configuration information may be one or more SRS resource candidates (or multiple SRS resource sets) that are set separately for each of the multiple panels. The control unit 110 may control the downlink control information to indicate, using one or more fields included in the downlink control information, a combination of multiple SRS resource identifiers (SRIs) that are applied to UL transmissions transmitted from each of the multiple panels using a spatial division multiplexing scheme.

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

Note that this example mainly shows the functional blocks of the characteristic parts of this embodiment, 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.

The control unit 210 controls the entire user terminal 20. The control unit 210 can be composed of a controller, a control circuit, etc., which are described based on common understanding in the technical field to which this disclosure relates.

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

The transceiver 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 transceiver unit 220 may be composed of a transmitter/receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transceiver circuit, etc., which are described based on common understanding in the technical field related to the present disclosure.

The transmitter/receiver unit 220 may be configured as an integrated transmitter/receiver unit, or may be composed of a transmitter unit and a receiver unit. The transmitter unit may be composed of a transmission processing unit 2211 and an RF unit 222. The receiver unit may be composed of a reception processing unit 2212, an RF unit 222, and a measurement unit 223.

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

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

The transceiver unit 220 may form at least one of the transmit beam and the receive beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), etc.

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

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

Whether or not to apply DFT processing may be based on the settings of transform precoding. If transform precoding is enabled for a certain channel (e.g., PUSCH), the transceiver unit 220 (transmission processing unit 2211) may perform DFT processing as the transmission processing to transmit the channel using a DFT-s-OFDM waveform; if not, it may not be necessary to perform DFT processing as the transmission processing.

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

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

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

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

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

The transceiver 220 may receive configuration information regarding sounding reference signal (SRS) resources. The configuration information may be one or more SRS resource candidates (or one SRS resource set) to be configured for multiple panels.

The control unit 210 may control UL transmissions transmitted from multiple panels using spatial division multiplexing based on a combination of SRS resource identifiers (SRIs) indicated in a field included in the downlink control information. An association between the maximum rank supported for UL transmission and the number of SRS resources that can be set for each panel may be set or defined. The total number of SRS resources that can be set for each panel may be equal to or greater than the corresponding maximum rank.

When performing UL transmission from multiple panels using spatial division multiplexing, the control unit 210 may determine the SRS resources corresponding to each panel by associating the index corresponding to a field defined in an existing system (e.g., Rel. 17) with the SRS resource identifier, assuming the number of SRS resources to be the total number of SRS resources across multiple panels. When performing UL transmission from multiple panels using spatial division multiplexing, the control unit 210 may assume that an SRI indicating only SRS resources corresponding to one panel or an SRI indicating rank 1 is not indicated.

The transceiver 220 may receive multiple pieces of configuration information regarding sounding reference signal (SRS) resources. The multiple pieces of configuration information may be one or more SRS resource candidates (or multiple SRS resource sets) that are configured separately for each of multiple panels.

The control unit 210 may control UL transmissions transmitted from multiple panels using spatial division multiplexing based on a combination of multiple SRS resource identifiers (SRIs) indicated in one or more fields included in the downlink control information. An association between the maximum rank supported for UL transmission and the number of SRS resources that can be set for each panel may be set or defined.

A first field included in the downstream control information may indicate the SRI corresponding to the first panel and the rank of the second panel, and a second field included in the downstream control information may indicate the SRI corresponding to the second panel.

A first field included in the downstream control information may indicate the rank of the first panel and the rank of the second panel, and another field different from the first field may indicate the SRI corresponding to the first panel and the SRI corresponding to the second panel.

Candidate SRS resources that can be indicated by multiple SRI combinations may be configured separately.

(Hardware configuration)
The block diagrams used to explain the above embodiments show functional blocks. These functional blocks (components) are realized by any combination of hardware and/or software. Furthermore, the method for realizing each functional block is not particularly limited. That is, each functional block may be realized using a single device that is physically or logically coupled, or may be realized using two or more physically or logically separated devices that are directly or indirectly connected (e.g., wired, wireless, etc.) and these multiple devices. The functional block may also be realized by combining software with the single device or multiple devices.

Here, functions include, but are not limited to, judgment, determination, assessment, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, election, establishment, comparison, assumption, expectation, deeming, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, and assignment. For example, a functional block (component) that performs transmission functions may be called a transmitting unit or transmitter. As mentioned above, there are no particular limitations on how these functions are implemented.

For example, a base station, a user terminal, etc. in one embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure. Figure 14 is a diagram showing an example of the hardware configuration of a base station and a user terminal according to one embodiment. The above-mentioned base station 10 and user terminal 20 may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, etc.

In this disclosure, terms such as apparatus, circuit, device, section, and unit may be used interchangeably. The hardware configuration of the base station 10 and user terminal 20 may be configured to include one or more of the devices shown in the figures, or may be configured to exclude some of the devices.

For example, although only one processor 1001 is shown, there may be multiple processors. Furthermore, processing may be performed by one processor, or processing may be performed by two or more processors simultaneously, sequentially, or using other techniques. Furthermore, processor 1001 may be implemented by one or more chips.

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

The processor 1001, for example, runs an operating system to control the entire computer. The processor 1001 may be configured as a central processing unit (CPU) including an interface with peripheral devices, a control unit, an arithmetic unit, registers, etc. For example, at least a portion of the above-mentioned control unit 110 (210), transceiver unit 120 (220), etc. may be realized by the processor 1001.

The processor 1001 also 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 in accordance with these. The programs used are those that cause a computer to execute at least some of the operations described in the above-described embodiments. For example, the control unit 110 (210) may be realized by a control program stored in the memory 1002 and running on the processor 1001, and similar implementations may be used for other functional blocks.

Memory 1002 is a computer-readable recording medium and may be composed of, for example, at least one of Read Only Memory (ROM), Erasable Programmable ROM (EPROM), Electrically EEPROM (EEPROM), Random Access Memory (RAM), or other suitable storage medium. Memory 1002 may also be referred to as a register, cache, main memory, etc. Memory 1002 may store executable programs (program code), software modules, etc. for implementing a wireless communication method according to one embodiment of the present disclosure.

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

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, or communication module. The communication device 1004 may be configured to include a high-frequency switch, duplexer, filter, frequency synthesizer, etc. to implement at least one of Frequency Division Duplex (FDD) and Time Division Duplex (TDD). For example, the above-mentioned transmitter/receiver unit 120 (220), transmitter/receiver antenna 130 (230), etc. may be implemented by the communication device 1004. The transmitter/receiver unit 120 (220) may be implemented as a transmitter unit 120a (220a) and a receiver unit 120b (220b) that are physically or logically separated.

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

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 may be configured using different buses between each device.

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), or a field programmable gate array (FPGA), and some or all of the functional blocks may be realized using such hardware. For example, the processor 1001 may be implemented using at least one of these pieces of hardware.

(Modification)
Note that terms described in the present disclosure and terms necessary for understanding the present disclosure may be replaced with terms having the same or similar meanings. For example, a channel, a symbol, and a signal (signal or signaling) may be interchangeable. A signal may also be a message. A reference signal may be abbreviated as RS, and may also be called a pilot, pilot signal, etc. depending on the applicable standard. A component carrier (CC) may also be called a cell, frequency carrier, carrier frequency, etc.

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

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

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). A slot may also be a time unit based on numerology.

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

Radio frame, subframe, slot, minislot, and symbol all represent time units for transmitting signals. Radio frame, subframe, slot, minislot, and symbol may be referred to by other names that correspond to them. Note that the time units such as frame, subframe, slot, minislot, and symbol used in this disclosure may be interpreted interchangeably.

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

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

A TTI may be a transmission time unit for a channel-coded data packet (transport block), code block, code word, etc., or may be a processing unit for scheduling, link adaptation, etc. Note that when a TTI is given, the time interval (e.g., the number of symbols) to which a transport block, code block, code word, etc. is actually mapped may be shorter than the TTI.

Note that when one slot or one minislot is referred to as a TTI, one or more TTIs (i.e., one or more slots or one or more minislots) may be the smallest time unit for scheduling. Furthermore, the number of slots (minislots) that constitute the smallest time unit for scheduling may be controlled.

A TTI with a time length of 1 ms may be referred to as a regular TTI (TTI in 3GPP Rel. 8-12), normal TTI, long TTI, regular subframe, normal subframe, long subframe, slot, etc. A TTI shorter than a regular TTI may be referred to as a shortened TTI, short TTI, partial TTI (partial or fractional TTI), shortened subframe, short subframe, minislot, subslot, slot, etc.

Note that a long TTI (e.g., a normal TTI, a subframe, etc.) may be interpreted as a TTI having a time length of more than 1 ms, and a short TTI (e.g., a shortened TTI, etc.) may be interpreted as a TTI having a TTI length shorter than that of a long TTI and greater than or equal to 1 ms.

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

In addition, an RB may include one or more symbols in the time domain and may be one slot, one minislot, one subframe, or one TTI in length. One TTI, one subframe, etc. may each be composed of one or more resource blocks.

In addition, one or more RBs may also be referred to as a physical resource block (PRB), a sub-carrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, etc.

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

A Bandwidth Part (BWP) (which may also be referred to as a partial bandwidth) may represent a subset of contiguous common resource blocks (RBs) for a given numerology on a given carrier, where the common RBs may be identified by their index relative to a Common Reference Point of the carrier. PRBs may be defined in a BWP and numbered within that BWP.

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

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

Note that the structures of the radio frames, subframes, slots, minislots, and symbols described above are merely examples. For example, the number of subframes included in a radio frame, the number of slots per subframe or radio frame, the number of minislots included in a slot, the number of symbols and RBs included in a slot or minislot, the number of subcarriers included in an RB, as well as the number of symbols in a TTI, symbol length, and cyclic prefix (CP) length can be varied in various ways.

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

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

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

In addition, information, signals, etc. may be output from a higher layer to a lower layer and/or from a lower layer to a higher layer. Information, signals, etc. may be input/output via multiple network nodes.

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

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

Note that physical layer signaling may also be referred to as Layer 1/Layer 2 (L1/L2) control information (L1/L2 control signal), L1 control information (L1 control signal), etc. Furthermore, RRC signaling may also be referred to as RRC messages, such as RRC Connection Setup messages and RRC Connection Reconfiguration messages. Furthermore, MAC signaling may also be notified using, for example, MAC Control Elements (CEs).

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

The determination may be made by a value represented by a single bit (0 or 1), by a Boolean value represented by true or false, or by a numerical comparison (e.g., comparison with a predetermined value).

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

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

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

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.

In this disclosure, terms such as "Base Station (BS)," "Radio Base Station," "Fixed Station," "NodeB," "eNB (eNodeB)," "gNB (gNodeB)," "Access Point," "Transmission Point (TP)," "Reception Point (RP)," "Transmission/Reception Point (TRP)," "Panel," "Cell," "Sector," "Cell Group," "Carrier," and "Component Carrier" may be used interchangeably. Base stations may also be referred to by terms such as macrocell, small cell, femtocell, and picocell.

A base station can accommodate one or more (e.g., three) cells. When a base station accommodates multiple cells, the entire coverage area of the base station can be divided into multiple smaller areas, and each smaller area can 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 a base station and/or base station subsystem that provides communication services within this coverage area.

In the present disclosure, a base station transmitting information to a terminal may be interpreted as the base station instructing the terminal to control/operate based on the information.

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

A mobile station may also be referred to as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable terminology.

At least one of the base station and the mobile station may be referred to as a transmitting device, a receiving device, a wireless communication device, etc. Note that at least one of the base station and the mobile station may be a device mounted on a moving object, the moving object itself, etc.

The term "mobile body" refers to a movable object that can move at any speed and naturally includes cases where the mobile body is stationary. Examples of such mobile bodies 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 objects carried by these. Furthermore, the mobile body may be a mobile body that moves autonomously based on operational commands.

The mobile object may be a vehicle (e.g., a car, an airplane, etc.), an unmanned mobile object (e.g., a drone, a self-driving car, etc.), or a robot (manned or unmanned). Note that at least one of the base station and the mobile station may also include devices that do 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.

Figure 15 is a diagram showing 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, an RPM sensor 51, an air 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.

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

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

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

The information service unit 59 is composed of various devices, such as a car navigation system, audio system, speakers, displays, televisions, and radios, for providing (outputting) various information such as driving information, traffic information, and entertainment information, as well as one or more ECUs that control these devices. The information service unit 59 uses information obtained from external devices via the communication module 60, etc., to provide various information/services (e.g., multimedia information/multimedia services) to the occupants of the vehicle 40.

The information service unit 59 may include input devices (e.g., keyboards, mice, microphones, switches, buttons, sensors, touch panels, etc.) that accept input from the outside, and may also include output devices (e.g., displays, speakers, LED lamps, touch panels, etc.) that output to the outside.

The driving assistance system unit 64 is composed of various devices that provide functions to prevent accidents and reduce the driver's driving burden, 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) and Inertial Navigation System (INS)), artificial intelligence (AI) chips, and AI processors, as well as one or more ECUs that control these devices. The driving assistance system unit 64 also transmits and receives various information via the communication module 60 to realize driving assistance or autonomous driving functions.

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 transmits and receives data (information) via the communication port 63 between 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, axles 48, the microprocessor 61 and memory (ROM, RAM) 62 in the electronic control unit 49, and various sensors 50-58, all of which are provided on the vehicle 40.

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

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

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

The communication module 60 also stores various information received from external devices in memory 62 that can be used by the microprocessor 61. Based on the information stored in 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, axles 48, various sensors 50-58, and the like provided on the vehicle 40.

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

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

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

Each aspect/embodiment described in this disclosure may be used alone, in combination, or switched between depending on the implementation. Furthermore, the processing procedures, sequences, flowcharts, etc. of each aspect/embodiment described in this disclosure may be rearranged unless inconsistent. For example, the methods described in this disclosure present elements of various steps in an exemplary order, and are not limited to the particular order presented.

The aspects/embodiments described in this disclosure may be implemented using standards such as 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 (x is, for example, an integer or decimal number)), Future Radio Access (FRA), New-Radio Access Technology (RAT), New Radio (NR), New radio access (NX), Future generation radio access (FX), Global System for Mobile communications (GSM (registered trademark)), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.17 (WiMAX (registered trademark)), IEEE 802.18 (WiMAX (registered trademark)), IEEE 802.19 (WiMAX (registered trademark)), IEEE 802.20 (WiMAX (registered trademark)), IEEE 802.21 (Wi-Fi (registered trademark)), IEEE 802.22 (WiMAX (registered trademark)), IEEE 802.23 (WiMAX (registered trademark)), IEEE 802.24 (WiMAX (registered trademark)), IEEE 802.25 (WiMAX (registered trademark)), IEEE 802.26 (WiMAX (registered trademark)), IEEE 802.27 (WiMAX (registered trademark)), IEEE 802.28 (WiMAX (registered trademark)), IEEE 802.29 ... The present invention may be applied to systems that use IEEE 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), or other suitable wireless communication methods, or to next-generation systems that are expanded, modified, created, or defined based on these. Furthermore, the present invention may be applied to a combination of multiple systems (e.g., a combination of LTE or LTE-A and 5G).

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

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

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

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

"Judgment" may also be considered to be "deciding" on resolving, selecting, choosing, establishing, comparing, etc. In other words, "judgment" may also be considered to be "deciding" on some action.

In addition, "judgment (decision)" can also be interpreted as "assuming," "expecting," "considering," etc.

The term "maximum transmit power" used in this disclosure may mean the maximum value of transmit power, the nominal UE maximum transmit power, or the rated UE maximum transmit power.

As used in this disclosure, the terms "connected," "coupled," or any variation thereof, mean any direct or indirect connection or coupling between two or more elements, and may include the presence of one or more intermediate elements between two elements that are "connected" or "coupled" to each other. The coupling or connection between elements may be physical, logical, or a combination thereof. For example, "connected" may be read as "access."

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

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 "combined" may also be interpreted in the same way as "different."

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

In this disclosure, where articles are added by translation, such as a, an, and the in English, this disclosure may include the noun following these articles being plural.

In this disclosure, terms such as "less than or equal to," "less than," "greater than," "more than," "equal to," etc. may be read interchangeably. Furthermore, in this disclosure, terms meaning "good," "bad," "big," "small," "high," "low," "fast," "slow," "wide," "narrow," etc. may be read interchangeably, not limited to the positive, comparative, and superlative. Furthermore, in this disclosure, terms meaning "good," "bad," "big," "small," "high," "low," "fast," "slow," "wide," "narrow," etc. may be read interchangeably, not limited to the positive, comparative, and superlative, as expressions with the prefix "i-th" (i is any integer) (for example, "highest" may be read interchangeably as "i-th highest").

In this disclosure, the terms "of," "for," "regarding," "related to," "associated with," etc. may be read interchangeably.

The invention according to the present disclosure has been described in detail above, but it will be clear to those skilled in the art that the invention according to the present disclosure is not limited to the embodiments described herein. The invention according to the present disclosure can be implemented in modified and altered forms without departing from the spirit and scope of the invention as defined by the claims. Therefore, the description of the present disclosure is intended to be illustrative and explanatory and does not pose any limiting meaning to the invention according to the present disclosure.

Claims (5)

a receiving unit for receiving a plurality of configuration information related to sounding reference signal (SRS) resources;
a control unit that controls uplink ( UL ) transmissions transmitted from the plurality of panels using a space division multiplexing scheme based on a combination of a plurality of SRS resource identifiers (SRIs) indicated by one or more fields included in the downlink control information;
A terminal in which a combination of a maximum number of layers supported for the UL transmission and a number of SRS resources that can be set for each panel is defined, and the number of SRS resources is less than or equal to a specific number . The terminal according to claim 1 , wherein candidates for SRS resources that can be indicated in each of the plurality of combinations of SRIs are set separately. receiving a plurality of configuration information related to sounding reference signal (SRS) resources;
and controlling uplink ( UL ) transmissions transmitted from the plurality of panels using a spatial division multiplexing scheme based on a combination of a plurality of SRS resource identifiers (SRIs) indicated by one or more fields included in the downlink control information;
A wireless communication method for a terminal, wherein a combination of a maximum number of layers supported for the UL transmission and a number of SRS resources that can be set for each panel is defined, and the number of SRS resources is equal to or less than a specific number . a transmitter for transmitting a plurality of pieces of configuration information related to sounding reference signal (SRS) resources;
a control unit that controls a combination of a plurality of SRS resource identifiers (SRIs) applied to uplink ( UL ) transmissions transmitted from a plurality of panels using a space division multiplexing scheme, so as to indicate the combination by using one or more fields included in the downlink control information;
A base station in which a combination of a maximum number of layers supported for the UL transmission and a number of SRS resources that can be set for each panel is defined, and the number of SRS resources is less than or equal to a specific number . A system having a terminal and a base station,
The terminal includes: a receiving unit that receives a plurality of pieces of configuration information related to sounding reference signal (SRS) resources;
a control unit that controls uplink (UL) transmissions transmitted from the plurality of panels using a space division multiplexing scheme based on a combination of a plurality of SRS resource identifiers (SRIs) indicated by one or more fields included in the downlink control information;
The base station includes: a transmitter that transmits the plurality of pieces of setting information;
a control unit that controls the combination of the plurality of SRIs to be indicated using the one or more fields,
A system in which a combination of the maximum number of layers supported for the UL transmission and the number of SRS resources that can be set for each panel is defined, and the number of SRS resources is less than or equal to a specific number.