User terminal and wireless communication method

Abstract

A spatial relation for an UL signal / channel is appropriately set. A user terminal according to one embodiment of the present disclosure is characterized by including a reception unit that receives a medium access control (MAC) control element for activating spatial relation information (SRI) related to a sounding reference signal (SRS) resource set, and a control unit that applies the SRI activated by the MAC control element in a specific uplink transmission.

Description

Technical Field

[0001] This disclosure relates to user terminals and wireless communication methods in next-generation mobile communication systems. Background Technology

[0002] In Universal Mobile Telecommunications System (UMTS) networks, Long Term Evolution (LTE) was standardized with the aim of achieving higher data rates and lower latency (Non-Patent Document 1). Furthermore, LTE-Advanced (3GPP Rel. 10-14) was standardized with the aim of further increasing capacity and improving the height of LTE (Third Generation Partnership Project (3GPP) Release (Rel.) 8, 9).

[0003] The development of successor systems to LTE is also underway (e.g., also known as the 5th generation mobile communication system (5G), 5G+, New Radio (NR), 3GPP Rel.15 and later, etc.).

[0004] Existing technical documents

[0005] Non-patent literature

[0006] Non-patent document 1: 3GPP TS 36.300 V8.12.0 "Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2 (Release 8)", April 2010 Summary of the Invention

[0007] The problem that the invention aims to solve

[0008] In NR, the user equipment (UE) controls the transmission processing of at least one of the uplink signals and channels (also referred to as signal / channel) based on a specific spatial relation (e.g., at least one of transmission, mapping, precoding, modulation, and coding).

[0009] In Rel-15 NR, the configuration information for the measurement reference signal (SRS) resource assigned to the UE includes spatial relationship information (also known as spatial relationship information (SRI)). That is, SRS resources and spatial relationships are configured in a one-to-one association.

[0010] On the other hand, the NR specification is exploring increasing the number of UL beams (SRIs) that the UE can utilize (e.g., setting it to 64). However, based on the existing Rel-15NR specification, there are the following issues: to increase the number of SRIs that the UE can utilize, the SRS resources to be configured need to be increased accordingly, which increases the communication overhead for configuration.

[0011] Therefore, one of the objectives of this disclosure is to provide a user terminal and a wireless communication method that can appropriately set the spatial relationship for UL signals / channels.

[0012] Methods for solving problems

[0013] One aspect of the user terminal disclosed herein is characterized by comprising: a receiving unit that receives a Medium Access Control (MAC) element for activating a Spatial Relation Information (SRI) associated with a Sounding Reference Signal (SRS) resource set; and a control unit that applies the SRI activated by the MAC element during a specific uplink transmission.

[0014] Invention Effects

[0015] According to one aspect of this disclosure, spatial relationships for UL signals / channels can be appropriately configured. Attached Figure Description

[0016] Figure 1 This is a diagram illustrating an example of the settings for SRS resources and SRI in an existing Rel-15NR.

[0017] Figure 2 This diagram illustrates an example of the SRS resources and SRI settings involved in the first embodiment.

[0018] Figures 3A to 3D This diagram illustrates an example of SRI activation / deactivation of the MAC CE according to the first embodiment.

[0019] Figure 4 This diagram illustrates an example of the settings for SRS resources and SRIs involved in the fourth embodiment.

[0020] Figure 5 This diagram illustrates an example of SRI activation / deactivation of the MAC CE according to the fourth embodiment.

[0021] Figure 6 This is a diagram illustrating an example of the schematic structure of a wireless communication system according to one embodiment.

[0022] Figure 7 This is a diagram illustrating an example of the structure of a base station according to one embodiment.

[0023] Figure 8 This is a diagram illustrating an example of the structure of a user terminal according to one embodiment.

[0024] Figure 9 This is a diagram illustrating an example of the hardware structure of a base station and a user terminal according to one embodiment. Detailed Implementation

[0025] (SRS)

[0026] In NR, the use of measurement reference signals (SRS) is widespread. NR's SRS is used not only for uplink (UL) CSI measurements, which are also utilized in existing LTE (LTE 1.8-14), but also for downlink (DL) CSI measurements, beam management, and more.

[0027] A UE can also be configured with one or more SRS resources. SRS resources can also be identified through the SRS Resource Index (SRI).

[0028] Each SRS resource can also have one or more SRS ports (or correspond to one or more SRS ports). For example, the number of ports for each SRS can be 1, 2, 4, etc.

[0029] The UE can also be configured with one or more SRS resource sets. An SRS resource set can also be associated with a specific number of SRS resources. The UE can also use higher-layer parameters publicly for the SRS resources contained in an SRS resource set. Furthermore, the resource set in this disclosure can also be replaced with a set, resource group, group, etc.

[0030] Information related to SRS resources or resource sets can also be set to the UE using higher-layer signaling, physical-layer signaling, or a combination thereof.

[0031] Additionally, in this disclosure, higher-layer signaling may be any one or a combination of Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, etc.

[0032] MAC signaling can also use MAC Control Element (MACCE) or MAC Protocol Data Unit (PDU). Broadcast information can also be, for example, Master Information Block (MIB), System Information Block (SIB), Remaining Minimum System Information (RMSI), or Other System Information (OSI).

[0033] Physical layer signaling can also be, for example, downlink control information (DCI).

[0034] SRS configuration information (e.g., the RRC information element "SRS-Config") can also include SRS resource set configuration information, SRS resource configuration information, etc.

[0035] SRS resource set configuration information (e.g., RRC parameter "SRS-ResourceSet") may also include SRS resource set ID (identifier) ​​(SRS-ResourceSetId), a list of SRS resource IDs (SRS-ResourceId) used in the resource set, SRS resource type, and SRS usage information.

[0036] Here, the SRS resource type can also represent any of the following: Periodic SRS (P-SRS), Semi-Persistent SRS (SP-SRS), and Aperiodic CSI (A-SRS). Additionally, the UE can periodically (or periodically after activation) send P-SRS and SP-SRS. The UE can also send A-SRS based on SRS requests from the DCI.

[0037] Furthermore, the uses of SRS (RRC parameter "usage", L1 (Layer-1) parameter "SRS-SetUse") can also include beam management, codebook, non-codebook, antenna switching, etc. Codebook or non-codebook SRS can also be used to determine the precoder for codebook-based or non-codebook-based uplink shared channel (PUSCH) transmission based on SRI.

[0038] For beam management purposes, SRS can also be envisioned such that, for each SRS resource set, only one SRS resource can be transmitted at a specific time instant. Alternatively, if multiple SRS resources belong to different SRS resource sets, these SRS resources can also be transmitted simultaneously.

[0039] SRS resource configuration information (e.g., RRC parameter "SRS-Resource") may also include SRS resource ID (SRS-ResourceId), number of SRS ports, SRS port number, transmission combo, SRS resource mapping (e.g., time and / or frequency resource location, resource offset, resource period, repetition count, number of SRS symbols, SRS bandwidth, etc.), hopping association information, SRS resource type, sequence ID, spatial relationship information, etc.

[0040] The UE can also transmit SRS in adjacent symbols within the last 6 symbols of a time slot, with the number of SRS symbols corresponding to the number of SRS symbols. In addition, the number of SRS symbols can also be 1, 2, 4, etc.

[0041] The UE can switch the BWP (Bandwidth Part) used for SRS transmission on a per-slot basis, and it can also switch the antennas. In addition, the UE can also apply at least one of intra-slot hopping and inter-slot hopping to SRS transmission.

[0042] (Spatial Relationships)

[0043] In NR, the UE controls the transmission processing of at least one of the uplink signals and channels (also referred to as signal / channel) based on a specific spatial relation (e.g., at least one of transmission, mapping, precoding, modulation, and coding).

[0044] Spatial relationships applicable to specific signals / channels can also be determined by spatial relationship information (SRI) that is notified (set) through higher-layer signaling. Spatial relationship information of the SRS (e.g., the RRC parameter "spatialRelationInfo") can also represent the spatial relationship information between a specific reference signal (RS) and the SRS.

[0045] The specific reference signal can also be at least one of the following: a Synchronization Signal Block (SSB), a Channel State Information-Reference Signal (CSI-RS), and a Measurement Reference Signal (Sounding Reference Signal (SRS)). Here, the SSB can also be referred to as a Synchronization Signal / Physical Broadcast Channel (SS / PBCH) block.

[0046] SRS spatial relationship information may also include at least one of the following: SSB index, CSI-RS resource ID, and SRS resource ID, as an index to the aforementioned specific reference signal.

[0047] Additionally, in this disclosure, the SSB index, SSB resource ID, and SSBRI (SSB Resource Indicator) can be interchanged. Furthermore, the CSI-RS index, CSI-RS resource ID, and CRI (CSI-RS Resource Indicator) can also be interchanged. Furthermore, the SRS index, SRS resource ID, and SRI can also be interchanged.

[0048] The configured SRI may also include at least one of the SSB index, CSI-RS resource ID, and SRS resource ID, serving as an index to the specific RS mentioned above. Furthermore, the SRI may also include the serving cell index, Bandwidth Part (BWP) ID, etc., corresponding to the specific RS mentioned above.

[0049] In addition, in this disclosure, indexes, IDs, indicators, resource IDs, etc., can be interchanged.

[0050] When a UE is configured with spatial relationship information related to an SSB or CSI-RS and an SRS for a specific SRS resource, it can also use the same spatial domain filter as the spatial domain filter used to receive that SSB or CSI-RS to transmit that SRS resource. In other words, in this case, the UE can also assume that the UE's receive beam for the SSB or CSI-RS is the same as the UE's transmit beam for the SRS.

[0051] When a UE is configured with spatial relationship information related to other SRSs (reference SRSs) and the target SRS for a specific SRS (target SRS), it can also use the same spatial domain filter as the spatial domain filter used to transmit the reference SRS to transmit the target SRS resource. In other words, in this case, the UE can also assume that the UE transmits the same beam for the reference SRS as it transmits the target SRS.

[0052] Furthermore, the spatial domain filter used for base station transmission, the downlink spatial domain transmission filter, and the base station's transmit beam can be interchanged. Similarly, the spatial domain filter used for base station reception, the uplink spatial domain receive filter, and the base station's receive beam can also be interchanged.

[0053] Furthermore, the spatial domain filter used for UE transmission, the uplink spatial domain transmission filter, and the UE's transmit beam can be interchanged. Similarly, the spatial domain filter used for UE reception, the downlink spatial domain receive filter, and the UE's receive beam can also be interchanged.

[0054] The beam indication used for the uplink control channel (Physical Uplink Control Channel (PUCCH)) can also be set via higher-layer signaling. For example, if the PUCCH spatial relation information includes a single spatial relation information (SpatialRelationInfo) parameter, the UE can apply this pre-set parameter to the PUCCH. If the PUCCH spatial relation information includes more than one spatial relation information parameter, the (activated) parameter applied to the PUCCH can be determined based on the MAC CE.

[0055] In addition, the spatial relationship information of PUCCH can also be obtained by replacing SRS with PUCCH in the spatial relationship information of SRS mentioned above, so it will not be explained again.

[0056] The beam indication used for PUSCH can also be determined based on the SRI (SRS Resource Indicator) field included in the DCI. The UE can also transmit PUSCH using the same transmit beam as the corresponding SRS in the SRS set by the higher layer, based on the specified SRI. Furthermore, the beam indication used for SRS can also be the same.

[0057] For example, a UE configured to transmit PUSCH based on a codebook can also determine (select) the SRS resources included in the SRS resource set whose purpose conforms to the codebook based on the SRI field of the DCI.

[0058] A UE configured to transmit PUSCH based on a non-codebook can also determine (select) the SRS resources included in the non-codebook SRS resource set based on the SRI field of the DCI.

[0059] Furthermore, the number of SRS resources in an SRS resource set whose purpose conforms to the codebook can differ from the number of SRS resources in an SRS resource set whose purpose conforms to a non-codebook; for example, the former could have 2 resources and the latter 4 resources. In this case, the size of the SRI field could also be 1 bit in the former and 2 bits in the latter.

[0060] In addition, in the existing Rel-15NR, the configuration information of SRS resources includes spatial relationship information. That is, SRS resources and spatial relationships are associated and configured one-to-one through RRC.

[0061] Additionally, spatial relationship information (SRI) can also be associated with beams. For example, a UE can be designed to be transmitted using different beams for UL transmissions corresponding to different SRIs.

[0062] Figure 1 This diagram illustrates an example of the settings for SRS resources and SRIs in an existing Rel-15NR. In this example, we envision an SRS resource set containing multiple SRS resources being configured. SRS resource #0, corresponding to SRS resource ID #0, and SRS resource #1, corresponding to SRS resource ID #1, each have specific SRI settings.

[0063] The NR specification is exploring increasing the number of UL beams (SRIs) that the UE can utilize (e.g., increasing them to 64). However, in Figure 1 As shown in the example, based on the existing NR specification, the following issues exist: In order to increase the SRIs that the UE can utilize, the SRS resources to be configured need to be increased accordingly, which increases the communication overhead for configuration.

[0064] Therefore, the inventors of this invention conceived of a method for appropriately setting (or specifying) the spatial relationship for UL signals / channels. According to one aspect of this disclosure, the UL beam of the SRS, the UL beam of the PUSCH, etc., can be flexibly controlled.

[0065] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. The wireless communication methods involved in each embodiment can be applied individually or in combination.

[0066] Additionally, SRI in the following embodiments can also be replaced with spatial relationship information for SRS (SRI for SRS). Furthermore, "applying an SRI ID (or an SRI corresponding to an SRI ID) to a specific signal / channel" can also be replaced with "applying a spatial relationship corresponding to an SRI ID to a specific signal / channel".

[0067] In the following implementation, the UE can be ignored even if it is configured with a spatial relationship (SRS-SpatialRelationInfo contained in the RRC information element "SRS-Resource") that is set one-to-one with the SRS resource through RRC as specified in the existing NR specification.

[0068] Furthermore, the SRS resource set in the following embodiments may be limited to an SRS resource set used for codebooks or non-codebook purposes, or may not be limited.

[0069] (Wireless communication method)

[0070] <First Implementation Method>

[0071] In the first embodiment, for one SRS resource set, the UE is configured with multiple spatial relationship information (SRI) via higher-layer signaling.

[0072] For example, a UE can also have one or more SRIs set for a specific SRS resource set. This spatial relationship information can correspond to the existing Rel-15NR specification's RRC information element "SRS-SpatialRelationInfo", or it can correspond to information obtained by extending, changing, or modifying this RRC information element.

[0073] The UE can also be configured with a specific number (e.g., M) of SRIs for a single SRS resource set via RRC signaling. Here, the specific number M can be, for example, 8, 16, 32, 64, or greater than 64.

[0074] SRIs can also be set in association with a specific ID (also known as an SRI ID, etc.) used to identify (determine) the SRI.

[0075] Figure 2 This diagram illustrates an example of the SRS resources and SRI settings involved in the first embodiment. In this example, with Figure 1 In contrast, the SRS resources included in the SRS resource set are not fixedly associated with SRIs. For example, SRI#0 corresponding to SRI ID#0 and SRI#1 corresponding to SRI ID#1 can also be assigned to the UE.

[0076] Alternatively, for a UE, for a given SRS resource set, one of the M pre-defined SRIs is activated or deactivated via a MAC CE. This MAC CE can also specify the SRI ID to be activated or deactivated. This MAC CE can also be referred to as an SRS spatial relation activation / deactivation MAC CE, an SRI activation / deactivation MAC CE, etc.

[0077] When a UE is configured with more than one SRI associated with an SRS resource set, it can also control the activation / deactivation of the MAC CE based on the SRI so that one SRI is activated for one SRS resource set at a certain time.

[0078] Figures 3A to 3D This diagram illustrates an example of an SRI-activated / deactivated MAC CE according to the first embodiment. Each example shows the bit string constituting the MAC CE, represented by three octets (Octet, Oct) 1 to 3 (8 bits × 3 = 24 bits). However, the number of bits in the MAC CE is not limited to this.

[0079] The MAC CE can also contain information such as the Serving Cell ID ("Serving Cell ID" field), BWP ID ("BWP ID" field), and SRS Resource Set ID ("SRS Resource Set ID" field) of the application object.

[0080] Additionally, the "R" field can also refer to reserved bits for future expansion.

[0081] Figure 3A The MAC CE contains "S i (e.g., i = 0-7) field. UE in a certain S i Even if the field indicates 1, the SRI with SRI ID#i can still be activated. The UE in a certain S... i Even if the field value is 0, the SRI with SRI ID#i can still be deactivated. Additionally, Figure 3A This is an example where M=8, but when M has other values, S i The number of fields can also be increased or decreased.

[0082] Figure 3B The MAC CE includes and Figure 3AThe MAC CE has almost the same structure, but the difference lies in the field containing the SRI ID. When M is large (e.g., M = 64), the MAC CE shown in this example can appropriately reduce the number of bits for representing the SRI ID to be activated.

[0083] Figure 3C The MAC CE of Figure 3B has almost the same structure as the MAC CE of

[0084] Figure 3C except that the reserved bits are slightly reduced and the field size of the SRI ID increases from 6 bits to 8 bits. The field of the SRI ID of

[0085] Figure 3D can specify IDs from 0 to 255. When M is even larger (e.g., M = 256), the MAC CE shown in this example can appropriately reduce the number of bits. Figure 3C The MAC CE of

[0086] Figure 3D has almost the same structure as the MAC CE of

[0087] except that, further, there is no SRS resource set ID field and the field size of the SRI ID increases to 16 bits. The field of the SRI ID of

[0088] Figure 3A can specify IDs corresponding to M > 256. When M is very large (e.g., M > 256), the MAC CE shown in this example can appropriately reduce the number of bits.

[0089] Figure 3B

[0090] Figure 3C

[0091] Figure 3D

[0092]

[0093] Figure 3B-3D

[0094] Figures 3B to 3D Here, the above first, second, third, and fourth ranges can be set by higher layer signaling respectively or can be specified by the specification.

[0093] In addition, if the UE receives such Figure 3B-3D Such a MAC CE can deactivate a SRI ID if the SRI ID specified by the MAC CE is already activated. If the SRI ID specified by the MAC CE is not activated, but another activated SRI ID exists, that other SRI ID can be deactivated, and the specified SRI ID can be activated.

[0094] UE can also be envisioned as such Figures 3B to 3D Such a MAC CE contains information indicating the activation or deactivation of the SRI ID (for example, it can also be represented by more than one R field). The UE can also control the activation / deactivation of the designated SRI ID based on this information.

[0095] In addition, such as Figures 3A to 3C Therefore, if the MAC CE includes an SRS resource set ID field, the UE can also assume that the SRI is activated / deactivated on a per-SRS resource set basis. For example... Figure 3D Therefore, even if the MAC CE does not include an SRS resource set ID field, it can be envisioned that SRIs are activated / deactivated in a manner common to multiple SRS resource sets (in other words, BWP units, cell units, etc.). Other implementation methods are similar.

[0096] The UE can also be envisioned as applying the SRI ID activated by the aforementioned MAC CE for the transmission of specific signals / channels (e.g., PUSCH, SRS).

[0097] According to the first embodiment described above, the UE can apply the same spatial relationship (SRI designated (activated) by MAC CE) to PUSCH / SRS and transmit regardless of the SRS resources of the SRS resource set.

[0098] <Second Implementation Method>

[0099] In the second embodiment, for one SRS resource, the UE may be configured with multiple spatial relationship information (SRI) via higher-layer signaling.

[0100] For example, a UE may be configured with one or more SRIs for a specific SRS resource. The spatial relationship information may correspond to the existing Rel-15NR specification's RRC information element "SRS-SpatialRelationInfo", or it may correspond to information that has been extended, changed, or modified for that RRC information element.

[0101] Alternatively, for a single SRS resource, the UE can be configured with a specific number (e.g., M) of SRIs via RRC signaling. Here, the specific number M can be, for example, 8, 64, or greater than 64.

[0102] SRIs can also be set in association with a specific ID (also known as an SRI ID, etc.) used to identify (determine) the SRI.

[0103] In the second embodiment, it is also conceivable to be with Figure 2 The same SRS resource and SRI settings can also include multiple SRI settings within the SRS resource settings.

[0104] Alternatively, for the UE, for one SRS resource, one of the M pre-defined SRIs is activated or deactivated via the MAC CE. Regarding this MAC CE, the SRS resource set ID of the MAC CE described in the first embodiment can be replaced with the SRS resource ID, and therefore will not be described again.

[0105] The UE can also be envisioned to apply the SRI ID activated by the aforementioned MAC CE for the SRS resource specified by the DCI during the transmission of a specific signal / channel (e.g., PUSCH, SRS).

[0106] For example, consider the scenario where the SRI (SRS Resource Indicator) field of the DCI corresponds to SRS resource #0 when it is 0, and SRI field = 1 corresponds to SRS resource #1. Activation can be performed using the aforementioned MAC CE, such as SRS resource #0 corresponding to SRI #0 and SRS resource #1 corresponding to SRI #1, or SRS resource #0 corresponding to SRI #2 and SRS resource #1 corresponding to SRI #0.

[0107] According to the second embodiment described above, the UE can apply and transmit dedicated spatial relationships (SRIs specified (activated) by the MAC CE) for each SRS resource in the SRS resource set for PUSCH / SRS. In one aspect of the second embodiment, different SRIs can be flexibly envisioned based on the value of the SRI field of the DCI (that is, the SRS resource).

[0108] <Third Implementation Method>

[0109] In the third embodiment, the UE may also envision that the spatial relationship of the SRS is the same as the spatial relationship of a specific PUCCH. For example, the UE may also envision that in the first or second embodiment described above, when the SRI of the SRS is not set, or when the SRIs of the SRS are not activated, the spatial relationship of the SRS is the same as the spatial relationship of a specific PUCCH.

[0110] The UE can also be envisioned as applying specific PUCCH spatial relationships to the transmission of specific signals / channels (e.g., PUSCH, SRS).

[0111] The spatial relation of this particular PUCCH can also be a spatial relation corresponding to any one or a combination of the following:

[0112] • Spatial relationships of the latest PUCCH (e.g., spatial relationships of the most recently sent PUCCH);

[0113] • Spatial relationships corresponding to a specific PUCCH SRI (spatial relationship information) (e.g., spatial relationships with PUCCH SRI ID=0);

[0114] · PUCCH's default spatial relationships,

[0115] • Spatial relationships applied to specific service areas;

[0116] • Spatial relationships applied to a specific BWP.

[0117] According to the third embodiment described above, the UE can transmit PUSCH / SRS using the same spatial relationships as PUCCH. Since PUCCH is highly likely to utilize appropriate spatial relationships for communication with the base station, it is expected that PUSCH / SRS communication will be properly maintained.

[0118] <Fourth Implementation Method>

[0119] In the first to third embodiments described above, an example is shown of applying one SRI contained in one SRS resource set (e.g., activated via MAC CE) to the transmission of a specific signal / channel, but it is not limited thereto.

[0120] In the fourth embodiment, the UE can also apply multiple SRIs contained in one SRS resource set to the transmission of a specific signal / channel. The fourth embodiment is suitable for situations where the UE performs UL transmission for multiple Transmission / Reception Points (TRPs) (multiple TRPs).

[0121] In addition, in this disclosure, the panel, uplink (UL) transmitting entity, TRP, DeModulation Reference Signal (DMRS) port, DMRS port group, Code Division Multiplexing (CDM) group, codeword, base station, etc. can also be interchanged.

[0122] The UE can improve the reliability of a signal / channel by applying different SRI-specific signals / channels to multiple TRP transmissions.

[0123] Figure 4 This diagram illustrates an example of the SRS resource and SRI settings involved in the fourth embodiment. This example is related to... Figure 2 Similar, but the difference is that SRS resource set settings can contain settings for multiple groups. A group can also contain one or more SRI settings. Figure 4 Only two groups are shown in the image, but the number of groups can be more than three.

[0124] In addition, the settings for each group can also include an ID (group ID) used to identify the group. The group can also be called an SRI group, an SRI set, etc. A group can also be associated with at least one TRP.

[0125] Regarding the UE, it could also mean that for a group, one of the configured SRIs is activated or deactivated via a MAC CE. This MAC CE could also be the aforementioned SRI activation / deactivation MAC CE. Additionally, this MAC CE could also contain a group ID. The group ID could also be, for example, using... Figures 3A to 3D The MAC CE indicates one or more "R" fields.

[0126] In addition, multiple groups of SRIs can be activated / deactivated simultaneously through a single MAC CE.

[0127] It can also be configured to combine the SRI IDs of each group to obtain an ID (also known as a combined SRI ID). For example, it can also be configured to the UE using higher-layer signaling, such as the combined SRI ID#0 corresponding to the SRI#0 of group #0 and the SRI#1 of group #1, the combined SRI ID#1 corresponding to the SRI#1 of group #0 and the SRI#2 of group #1, and so on.

[0128] In this case, a MAC CE can also be obtained by replacing the SRI ID field of the MAC CE described so far with the combined SRI ID field, and the SRIs of each group are activated.

[0129] Sending multiple SRIs activated via MAC CE can be performed for the same SRS resource or for different SRS resources.

[0130] The UE can also have the above-mentioned correspondence between groups and SRS resources configured via higher-layer signaling. For example, a configuration such as SRS resource #0 corresponding to group #0 and SRS resource #1 corresponding to group #1 can also be notified to the UE using RRC signaling.

[0131] In this case, if we assume that the SRI (SRS Resource Indicator) field of the DCI = 0 corresponds to SRS resource #0 and the SRI field = 1 corresponds to SRS resource #1, then the UE can apply the SRI of the activated group #0 for the former case and apply the SRI of the activated group #1 for the latter case.

[0132] Furthermore, even if the correspondence between the aforementioned groups and SRS resources is not set by a higher layer, it is conceivable that when the DCI contains multiple SRI fields, these SRI fields specify the SRS resources of their respective groups. The UE can also apply the SRI of the activated group #0 to the SRS resource corresponding to the first SRI field, and apply the SRI of the activated group #1 to the SRS resource corresponding to the second SRI field.

[0133] In addition, the UE can also determine the group of SRIs corresponding to the SRS resources specified via DCI based on at least one of the following:

[0134] • The TRP for the DCI was sent;

[0135] • The format of this DCI;

[0136] • Fields included in this DCI;

[0137] • The Radio Network Temporary Identifier (RNTI) corresponding to this DCI;

[0138] • The transport block size (TBS) of the data scheduled through this DCI;

[0139] • The duration (e.g., number of symbols) of UL transmissions (e.g., PUSCH) scheduled through this DCI;

[0140] • The purpose of the data scheduled through this DCI (e.g., for ultra-reliable and low-latency communications (URLLC)) and high-speed and high-capacity communications (e.g., enhanced mobile broadband (eMBB))).

[0141] Furthermore, the examples above illustrate a single SRS resource set containing multiple groups, but this is not an limitation. Different groups can also be configured using different SRS resource sets.

[0142] Furthermore, regarding the fourth implementation, in cases where a group is not set (e.g., such as...), Figure 2 In that case, it can also be applied when multiple SRIs are set only at a high level. In this case, the group can also be replaced with a TRP. Figure 5 This diagram illustrates an example of SRI activation / deactivation of MACCE according to the fourth embodiment.

[0143] Figure 5 MAC CE and Figure 3A Unlike the MAC CE, multiple Si values ​​can also be 1. In this example, S4 and S6 both have values ​​of 1. Multiple SRIs corresponding to Si values ​​of 1 can also be applied to each TRP. The UE can also determine which SRI ID#i to apply to which TRP based on specific rules.

[0144] For example, the UE can also envision that the activated SRI IDs correspond to each TRP in ascending or descending order. That is, it can also be envisioned that when the activated SRI IDs and TRP IDs are arranged in ascending or descending order respectively, the one-to-one correspondence is performed starting from the smaller one. Figure 5 In this case, the UE can also apply SRI ID#4 for TRP#0 and SRI ID#6 for TRP#1.

[0145] In addition, MAC CE containing multiple SRI IDs is not limited to Figure 5 The structure. For example, in Figures 3B to 3D In a MAC CE, a MAC CE containing multiple SRI ID fields can also be used.

[0146] According to the fourth embodiment described above, the UE can apply appropriate spatial relationships to the UL even when, for example, multiple TRPs are configured.

[0147] <Other>

[0148] At least one of the following, such as the number of SRS resources in each SRS resource set supported by the UE and the number of SRIs in each SRS resource set, can also be reported to the network (base station) as UE capability information. Furthermore, this capability information can be used to determine whether a UE is suitable for applying the above-described embodiments. For example, a UE whose supported SRS resource number in each SRS resource set is within a specific range (e.g., less than 16, less than 64, etc.) can also be considered to be controlled based on at least one of the above-described embodiments.

[0149] In addition, Figure 2 , Figure 4 Examples of including SRI settings in the settings of SRS resource sets are shown, but this is not an exception. SRI settings can also be made separately (independently) from the settings of SRS resource sets.

[0150] Furthermore, the above-described embodiments can also be applied to cases where multiple TRPs are not used (single TRP cases).

[0151] (Wireless Communication System)

[0152] The structure of a wireless communication system according to one embodiment of this disclosure will be described below. In this wireless communication system, communication is performed using one or a combination of the wireless communication methods according to the above embodiments of this disclosure.

[0153] Figure 6 This is a diagram illustrating an example of the schematic structure of a wireless communication system according to one embodiment. The wireless communication system 1 may also be a system that uses Long Term Evolution (LTE) or 5th generation mobile communication system New Radio (5G NR) as standardized by the Third Generation Partnership Project (3GPP).

[0154] Furthermore, the wireless communication system 1 can also support dual connectivity between multiple Radio Access Technologies (RATs) (Multi-RAT Dual Connectivity (MR-DC)). MR-DC can also 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.

[0155] 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.

[0156] Wireless communication system 1 can also support dual connectivity between multiple base stations within the same RAT (e.g., MN and SN are dual connectivity of NR base stations (gNB) (NR-NR Dual Connectivity (NN-DC))).

[0157] The wireless communication system 1 may also include: a base station 11 forming a macro cell C1 with a relatively wide coverage area, and a base station 12 (12a-12c) configured within the macro cell C1 and forming a small cell C2 narrower than the macro cell C1. User terminals 20 may also be located within at least one cell. The configuration and number of each cell and user terminal 20 are not limited to the arrangement shown in the figure. Hereinafter, without distinguishing between base stations 11 and 12, they will be collectively referred to as base station 10.

[0158] User terminal 20 may also connect to at least one of multiple base stations 10. User terminal 20 may also utilize at least one of carrier aggregation (CA) using multiple component carriers (CC) and dual connectivity (DC).

[0159] Each CC can also be included in at least one of the first frequency band (Frequency Range 1 (FR1)) and the second frequency band (Frequency Range 2 (FR2)). Macro cell C1 can also be included in FR1, and small cell C2 can also be included in FR2. For example, FR1 can also be a frequency band below 6 GHz (sub-6 GHz), and FR2 can also be a frequency band above 24 GHz (above-24 GHz). In addition, the frequency bands, definitions, etc. of FR1 and FR2 are not limited to these; for example, FR1 can also correspond to a frequency band higher than FR2.

[0160] In addition, user terminal 20 can also communicate in each CC using at least one of Time Division Duplex (TDD) and Frequency Division Duplex (FDD).

[0161] Multiple base stations 10 can also be connected via wired (e.g., fiber optic cable based on the Common Public Radio Interface (CPRI), X2 interface, etc.) or wireless (e.g., NR communication). For example, when NR communication between base stations 11 and 12 is used as a backhaul, base station 11, which is equivalent to a host station, can also be called an Integrated Access Backhaul (IAB) donor, and base station 12, which is equivalent to a relay station, can also be called an IAB node.

[0162] Base station 10 may also be connected to core network 30 via other base stations 10 or directly. Core network 30 may include, for example, at least one of Evolved Packet Core (EPC), 5G Core Network (5GCN), Next Generation Core (NGC), etc.

[0163] User terminal 20 can also be a terminal that supports at least one of the following communication methods: LTE, LTE-A, 5G, etc.

[0164] In wireless communication system 1, wireless access methods based on Orthogonal Frequency Division Multiplexing (OFDM) can also be used. For example, in at least one of the downlink (DL) and uplink (UL) links, Cyclic Prefix OFDM (CP-OFDM), Discrete Fourier Transform Spread OFDM (DFT-s-OFDM), Orthogonal Frequency Division Multiple Access (OFDMA), and Single Carrier Frequency Division Multiple Access (SC-FDMA) can also be used.

[0165] Wireless access methods can also be referred to as waveforms. In addition, in wireless communication system 1, other wireless access methods (e.g., other single-carrier transmission methods, other multi-carrier transmission methods) can also be applied in the wireless access methods of UL and DL.

[0166] In the wireless communication system 1, the downlink channel can also be a shared downlink channel (Physical Downlink Shared Channel (PDSCH)), a broadcast channel (Physical Broadcast Channel (PBCH)), or a downlink control channel (Physical Downlink Control Channel (PDCCH)) shared by each user terminal 20.

[0167] In addition, in the wireless communication system 1, the uplink channel can also be an uplink shared channel (Physical Uplink Shared Channel (PUSCH)), an uplink control channel (Physical Uplink Control Channel (PUCCH)), or a random access channel (Physical Random Access Channel (PRACH)) shared by each user terminal 20.

[0168] User data, high-level control information, and System Information Blocks (SIBs) are transmitted via PDSCH. User data and high-level control information can also be transmitted via PUSCH. Furthermore, Master Information Blocks (MIBs) can be transmitted via PBCH.

[0169] Lower-layer control information can also be transmitted via PDCCH. This lower-layer control information may include, for example, downlink control information (DCI), which contains scheduling information for at least one of PDSCH and PUSCH.

[0170] Additionally, the DCI for scheduling PDSCH can also be called DL allocation, DL DCI, etc., and the DCI for scheduling PUSCH can also be called UL authorization, UL DCI, etc. Furthermore, PDSCH can be replaced with DL data, and PUSCH can be replaced with UL data.

[0171] In PDCCH detection, a Control Resource Set (CORESET) and a search space can be utilized. A CORESET corresponds to the resources used to search for DCIs. The search space corresponds to the search area and search method for PDCCH candidates. A CORESET can be associated with one or more search spaces. The UE can also monitor CORESETs associated with a specific search space based on search space settings.

[0172] A search space can also correspond to PDCCH candidates corresponding to one or more aggregation levels. One or more search spaces can also be called a search space set. In addition, the terms "search space", "search space set", "search space setting", "search space set setting", "CORESET", and "CORESET setting" in this disclosure can be used interchangeably.

[0173] Uplink control information (UCI) can also be transmitted via PUCCH, including at least one of the following: Channel State Information (CSI), delivery confirmation information (e.g., also known as Hybrid Automatic Repeat Request ACK Knowledgement (HARQ-ACK), ACK / NACK, etc.), and Scheduling Request (SR). Random access preambles used for establishing a connection with the cell can also be transmitted via PRACH.

[0174] Additionally, in this disclosure, downlink, uplink, etc., may be described without the word "link". Furthermore, it may be described without "physical" at the beginning of various channels.

[0175] In wireless communication system 1, synchronization signals (SS) and downlink reference signals (DL-RS) can also be transmitted. In wireless communication system 1, as DL-RS, cell-specific reference signals (CRS), channel state information reference signals (CSI-RS), demodulation reference signals (DMRS), positioning reference signals (PRS), and phase tracking reference signals (PTRS) can also be transmitted.

[0176] Synchronization signals can be, for example, at least one of a primary synchronization signal (PSS) and a secondary synchronization signal (SSS). A signal block containing SS (PSS, SSS) and PBCH (and DMRS for PBCH) can also be called an SS / PBCH block, SS block (SSB), etc. In addition, SS, SSB, etc. can also be called reference signals.

[0177] Furthermore, in the wireless communication system 1, the uplink reference signal (UL-RS) can also transmit measurement reference signals (sounding reference signals (SRS)) and demodulation reference signals (DMRS). Additionally, DMRS can also be referred to as a user terminal-specific reference signal (UE-specific reference signal).

[0178] (Base station)

[0179] Figure 7 This diagram illustrates an example of the structure of a base station according to one embodiment. The base station 10 includes a control unit 110, a transmit / receive unit 120, a transmit / receive antenna 130, and a transmission path interface (transmission line interface) 140. Alternatively, more than one of each of the control unit 110, transmit / receive unit 120, transmit / receive antenna 130, and transmission path interface 140 may be included.

[0180] Furthermore, in this example, only the functional blocks of the characteristic parts of this embodiment are shown. The base station 10 can also be conceived to have other functional blocks required for wireless communication. Some of the processing of each unit described below can also be omitted.

[0181] The control unit 110 performs overall control of the base station 10. The control unit 110 can be composed of a controller, control circuit, etc., which are described based on common knowledge in the art to which this disclosure pertains.

[0182] The control unit 110 can also control signal generation and scheduling (e.g., resource allocation, mapping). The control unit 110 can also control transmission, reception, and measurement using the transmit / receive unit 120, transmit / receive antenna 130, and transmission path interface 140. The control unit 110 can also generate data, control information, sequences, etc., to be transmitted as signals and forward them to the transmit / receive unit 120. The control unit 110 can also perform call processing (setting, releasing, etc.) of the communication channel, status management of the base station 10, and management of wireless resources.

[0183] The transmitting / receiving unit 120 may also include a baseband unit 121, a radio frequency (RF) unit 122, and a measurement unit 123. The baseband unit 121 may also include a transmitting processing unit 1211 and a receiving processing unit 1212. The transmitting / receiving unit 120 can be composed of transmitters / receivers, RF circuits, baseband circuits, filters, phase shifters, measurement circuits, transmitting / receiving circuits, etc., as described based on common knowledge in the art to which this disclosure pertains.

[0184] The transmitting and receiving unit 120 can be configured as a single integrated transmitting and receiving unit, or it can be configured as a transmitting unit and a receiving unit. The transmitting unit can also be configured as a transmitting processing unit 1211 and an RF unit 122. The receiving unit can also be configured as a receiving processing unit 1212, an RF unit 122, and a measurement unit 123.

[0185] The transmitting and receiving antenna 130 can be constructed from an antenna, such as an array antenna, as described based on common knowledge in the art to which this disclosure pertains.

[0186] The transmitting / receiving unit 120 can also transmit the aforementioned downlink channel, synchronization signal, downlink reference signal, etc. The transmitting / receiving unit 120 can also receive the aforementioned uplink channel, uplink reference signal, etc.

[0187] The transmitting and receiving unit 120 may also use digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), etc., to form at least one of the transmitting beam and the receiving beam.

[0188] The transmitting and receiving unit 120 (transmitting processing unit 1211) may, for example, perform processing at the Packet Data Convergence Protocol (PDCP) layer, Radio Link Control (RLC) layer (e.g., RLC retransmission control), and Medium Access Control (MAC) layer (e.g., HARQ retransmission control) on the data and control information obtained from the control unit 110, and generate a bit string to be transmitted.

[0189] The transmitting and receiving unit 120 (transmitting processing unit 1211) can also perform transmission processing such as channel coding (which may also include error correction coding), modulation, mapping, filter processing, Discrete Fourier Transform (DFT) processing (as needed), Inverse Fast Fourier Transform (IFFT) processing, precoding, and digital-to-analog conversion on the bit string to be transmitted, and output the baseband signal.

[0190] The transmitting and receiving unit 120 (RF unit 122) can also perform modulation, filtering, amplification, etc. on the baseband signal to the wireless frequency band, and transmit the wireless frequency band signal through the transmitting and receiving antenna 130.

[0191] On the other hand, the transmitting and receiving unit 120 (RF unit 122) can also amplify, filter, demodulate, etc., the signals of the wireless frequency band received by the transmitting and receiving antenna 130.

[0192] The transmitting and receiving unit 120 (receiving and processing unit 1212) can also perform receiving and processing on the acquired baseband signal, including analog-to-digital conversion, Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing (as needed), filter processing, demapping, demodulation, decoding (which may also include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing, to obtain user data.

[0193] The transmitting / receiving unit 120 (measurement unit 123) can also perform measurements related to the received signal. For example, the measurement unit 123 can also perform radio resource management (RRM) measurements, channel state information (CSI) measurements, etc., based on the received signal. The measurement unit 123 can also 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 can also be output to the control unit 110.

[0194] The transmission path interface 140 can also transmit and receive signals (backhaul signaling) between the device included in the core network 30 and other base stations 10, and can also acquire and transmit user data (user plane data), control plane data, etc. for the user terminal 20.

[0195] In addition, the transmitting unit and receiving unit of the base station 10 in this disclosure may also be composed of at least one of a transmitting / receiving unit 120, a transmitting / receiving antenna 130, and a transmission path interface 140.

[0196] In addition, the transmitting and receiving unit 120 can also transmit a MACCE for activating the SRI associated with the SRS resource set.

[0197] Control unit 110 can also apply the SRI activated by the MAC control element to specific uplink transmissions (e.g., PUSCH, SRS). Transmit / receive unit 220 can also apply the activated SRI to perform the specific uplink transmission.

[0198] The transmitting and receiving unit 120 can also receive from the user terminal 20 the UL signal / channel transmitted by the SRI activated by the application through the MAC control element.

[0199] (User terminal)

[0200] Figure 8 This diagram illustrates an example of the structure of a user terminal according to one embodiment. The user terminal 20 includes a control unit 210, a transmitting / receiving unit 220, and a transmitting / receiving antenna 230. Alternatively, the control unit 210, the transmitting / receiving unit 220, and the transmitting / receiving antenna 230 may each be provided as one or more.

[0201] Furthermore, in this example, only the functional blocks of the characteristic parts of this embodiment are shown. The user terminal 20 can also be conceived to have other functional blocks required for wireless communication. Some of the processing of each unit described below can also be omitted.

[0202] The control unit 210 performs overall control of the user terminal 20. The control unit 210 can be composed of a controller, control circuit, etc., which are described based on common knowledge in the art to which this disclosure pertains.

[0203] The control unit 210 can also control signal generation, mapping, etc. The control unit 210 can also control transmission, reception, measurement, etc., using the transmission / reception unit 220 and the transmission / reception antenna 230. The control unit 210 can also generate data, control information, sequences, etc., to be transmitted as signals and forward them to the transmission / reception unit 220.

[0204] The transmitting / receiving unit 220 may also include a baseband unit 221, an RF unit 222, and a measurement unit 223. The baseband unit 221 may also include a transmitting processing unit 2211 and a receiving processing unit 2212. The transmitting / receiving unit 220 may be composed of a transmitter / receiver, RF circuit, baseband circuit, filter, phase shifter, measurement circuit, transmitting / receiving circuit, etc., as described based on common knowledge in the art to which this disclosure pertains.

[0205] The transmitting and receiving unit 220 can be configured as a single integrated transmitting and receiving unit, or it can be composed of a transmitting unit and a receiving unit. The transmitting unit can also be composed of a transmitting processing unit 2211 and an RF unit 222. The receiving unit can also be composed of a receiving processing unit 2212, an RF unit 222, and a measurement unit 223.

[0206] The transmitting and receiving antenna 230 can be constructed from an antenna, such as an array antenna, as described based on common knowledge in the art to which this disclosure pertains.

[0207] The transmitting / receiving unit 220 can also receive the downlink channel, synchronization signal, downlink reference signal, etc., mentioned above. The transmitting / receiving unit 220 can also transmit the uplink channel, uplink reference signal, etc., mentioned above.

[0208] The transmitting and receiving unit 220 may also use digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), etc., to form at least one of the transmitting beam and the receiving beam.

[0209] The transmitting and receiving unit 220 (transmitting processing unit 2211) may, for example, perform PDCP layer processing, RLC layer processing (e.g., RLC retransmission control), MAC layer processing (e.g., HARQ retransmission control) on the data and control information obtained from the control unit 210, and generate the bit string to be transmitted.

[0210] The transmitting and receiving unit 220 (transmitting processing unit 2211) can also perform channel coding (which may include error correction coding), modulation, mapping, filter processing, DFT processing (as needed), IFFT processing, precoding, digital-to-analog conversion and other transmission processing on the bit string to be transmitted, and output the baseband signal.

[0211] Furthermore, the application of DFT processing can be based on the transform precoding settings. For a specific channel (e.g., PUSCH), if transform precoding is active (enabled), the transmit / receive unit 220 (transmit processing unit 2211) can perform DFT processing as described above for transmitting the channel using the DFT-s-OFDM waveform. Otherwise, the transmit / receive unit 220 (transmit processing unit 2211) can perform the aforementioned transmit processing without performing DFT processing.

[0212] The transmitting and receiving unit 220 (RF unit 222) can also perform modulation, filtering, amplification, etc. on the baseband signal to the wireless frequency band, and transmit the wireless frequency band signal through the transmitting and receiving antenna 230.

[0213] On the other hand, the transmitting and receiving unit 220 (RF unit 222) can also amplify, filter, and demodulate the baseband signal for the wireless frequency band signal received by the transmitting and receiving antenna 230.

[0214] The transmitting and receiving unit 220 (receiving and processing unit 2212) can also perform receiving and processing on the acquired baseband signal, such as analog-to-digital conversion, FFT processing, IDFT processing (as needed), filter processing, demapping, demodulation, decoding (which may also include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing, to acquire user data.

[0215] The transmitting / receiving unit 220 (measurement unit 223) can also perform measurements related to the received signal. For example, the measurement unit 223 can also perform RRM measurements, CSI measurements, etc., based on the received signal. The measurement unit 223 can also measure received power (e.g., RSRP), received quality (e.g., RSRQ, SINR, SNR), signal strength (e.g., RSSI), propagation path information (e.g., CSI), etc. The measurement results can also be output to the control unit 210.

[0216] In addition, the transmitting unit and receiving unit of the user terminal 20 in this disclosure can also be configured by at least one transmitting / receiving unit 220 and transmitting / receiving antenna 230.

[0217] Additionally, the transmitting / receiving unit 220 can also receive a Medium Access Control (MACCE) element for activating Spatial Relation Information (SRI) related to a set of measurement reference signals (SRS) resources. This SRS resource set may also contain SRS resources. In other words, the SRS resource set can be replaced with SRS resources.

[0218] Control unit 210 can also apply the SRI activated by the MAC control element to specific uplink transmissions (e.g., PUSCH, SRS). Transmit / receive unit 220 can also apply the activated SRI to perform the specific uplink transmission.

[0219] When the MAC control element contains a field that identifies the SRS resource set (e.g., SRS resource set ID), the control unit 210 may also apply the SRI activated by the MAC control element for the specific uplink transmission, independent of the SRS resource specified by the downlink control information (DCI).

[0220] When the MAC control element contains a field that identifies the SRS resource (e.g., SRS resource ID), the control unit 210 may also apply the SRI activated by the MAC control element for the specific uplink transmission, based on the SRS resource specified by the downlink control information.

[0221] (Hardware Structure)

[0222] Furthermore, the block diagrams used in the description of the above embodiments illustrate functional units. These functional blocks (structural units) are implemented through any combination of at least one of hardware and software. Moreover, the implementation method of each functional block is not particularly limited. That is, each functional block can be implemented using a single device that is physically or logically combined, or it can be implemented by directly or indirectly (e.g., using wired, wireless, etc.) connecting two or more physically or logically separate devices. A functional block can also be implemented by combining one or more of the aforementioned devices with software.

[0223] Here, the functions include judgment, decision, determination, calculation, calculation, processing, export, investigation, search, confirmation, receiving, sending, output, access, resolution, selection, choosing, establishing, comparison, assumption, expectation, regard as, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, and assigning, but are not limited to these. For example, a functional block (structural unit) that implements the sending function can also be called a transmitting unit, transmitter, etc. As described above, the implementation method is not particularly limited.

[0224] For example, in one embodiment of this disclosure, the base station, user terminal, etc., can also function as a computer for processing the wireless communication method of this disclosure. Figure 9 This diagram illustrates an example of the hardware structure of a base station and a user terminal according to one embodiment. The base station 10 and the user terminal 20 described above can also be physically configured as a computer device including a processor 1001, a memory 1002, a storage device 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, etc.

[0225] Furthermore, in this disclosure, terms such as apparatus, circuit, device, section, and unit are interchangeable. The hardware structure of base station 10 and user terminal 20 can be configured to include one or more of the apparatuses shown in the figures, or it can be configured not to include any of the apparatuses.

[0226] For example, only one processor 1001 is shown, but there can be multiple processors. Furthermore, processing can be performed by one processor, or simultaneously, sequentially, or by two or more processors using other methods. Additionally, processor 1001 can be implemented using more than one chip.

[0227] The functions of the base station 10 and the user terminal 20 are implemented, for example, by reading specific software (programs) into hardware such as the processor 1001 and the memory 1002, so that the processor 1001 performs calculations and controls communication via the communication device 1004, or controls at least one of reading out and writing data in the memory 1002 and the storage device 1003.

[0228] The processor 1001, for example, enables the operating system to operate and control the computer as a whole. The processor 1001 may also be configured as a central processing unit (CPU) that includes interfaces with peripheral devices, control devices, arithmetic devices, registers, etc. For example, at least a portion of the control unit 110 (210), the transmit / receive unit 120 (220), etc., described above may also be implemented by the processor 1001.

[0229] Furthermore, the processor 1001 reads programs (program code), software modules, data, etc., from at least one of the storage 1003 and the communication device 1004 into the memory 1002, and performs various processes accordingly. As a program, a program that causes the computer to perform at least a portion of the operations described in the above embodiments can be used. For example, the control unit 110 (210) can also be implemented by a control program stored in the memory 1002 and operating in the processor 1001; similar implementations can be made for other functional blocks.

[0230] The memory 1002 may also be a computer-readable recording medium, such as being composed of at least one of read-only memory (ROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), random access memory (RAM), or other suitable storage media. The memory 1002 may also be referred to as a register, cache, main memory (main storage device), etc. The memory 1002 is capable of storing executable programs (program code), software modules, etc., for implementing the wireless communication method according to one embodiment of the present disclosure.

[0231] Storage device 1003 may also be a computer-readable recording medium, such as at least one of a flexible disk, a floppy disk, an optical disk (e.g., a compact disc ROM, CD-ROM), a digital multifunction disk, a Blu-ray disc, a removable disk, a hard disk, a smart card, a flash memory device (e.g., a card, a stick, a key drive), a magnetic stripe, a database, a server, or other suitable storage media. Storage device 1003 may also be referred to as an auxiliary storage device.

[0232] The communication device 1004 is hardware (transmitting and receiving device) used for communication between computers via at least one of a wired network and a wireless network. It is also referred to as a network device, network controller, network interface card (NIC), communication module, etc. To implement at least one of, for example, Frequency Division Duplex (FDD) and Time Division Duplex (TDD), the communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. For example, the aforementioned transmit / receive unit 120 (220) and transmit / receive antenna 130 (230) may also be implemented by the communication device 1004. The transmit / receive unit 120 (220) may also be physically or logically separated from the receive unit 120a (220a) and the receiver unit 120b (220b).

[0233] Input device 1005 is an input device that receives input from external sources (e.g., keyboard, mouse, microphone, switch, button, sensor, etc.). Output device 1006 is an output device that performs output to external sources (e.g., display, speaker, light-emitting diode (LED) lamp, etc.). Alternatively, input device 1005 and output device 1006 can also be an integrated structure (e.g., touch panel).

[0234] Furthermore, the processor 1001, memory 1002, and other devices are connected via a bus 1007 for communication of information. The bus 1007 can be a single bus or different buses can be used between the devices.

[0235] Furthermore, the base station 10 and the user terminal 20 can also be configured with hardware including a microprocessor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a programmable logic device (PLD), a field-programmable gate array (FPGA), etc., and can also use this hardware to implement part or all of the functional blocks. For example, the processor 1001 can also be installed using at least one of these hardware components.

[0236] (Modified Example)

[0237] Furthermore, the terms described in this disclosure and those necessary for understanding this disclosure may be replaced with terms that have the same or similar meanings. For example, channel, symbol, and signal (signal or signaling) may be used interchangeably. Additionally, a signal may also be a message. A reference signal may also be abbreviated as RS, and may be referred to as pilot, pilot signal, etc., depending on the applied standard. Furthermore, a component carrier (CC) may also be referred to as cell, frequency carrier, carrier frequency, etc.

[0238] A radio frame can also be composed of one or more periods (frames) in the time domain. Each period (frame) that constitutes the radio frame can also be called a subframe. Furthermore, a subframe can also be composed of one or more time slots in the time domain. A subframe can also be a fixed time length (e.g., 1 ms) independent of the parameter set (numerology).

[0239] Here, the parameter set can also refer to communication parameters applied in at least one of the transmission and reception of a signal or channel. For example, the parameter set can also represent at least one of the following: subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame structure, specific filtering processing performed by the transmitter and receiver in the frequency domain, and specific windowing processing performed by the transmitter and receiver in the time domain.

[0240] In the time domain, a time slot can also be composed of one or more symbols (Orthogonal Frequency Division Multiplexing (OFDM) symbols, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols, etc.). Furthermore, a time slot can also be a time unit based on a set of parameters.

[0241] A time slot can also contain multiple mini-time slots. Each mini-time slot can also consist of one or more symbols in the time domain. Furthermore, a mini-time slot can also be called a sub-time slot. A mini-time slot can also consist of fewer symbols than a time slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a mini-time slot can also be called PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using mini-time slots can also be called PDSCH (PUSCH) mapping type B.

[0242] Radio frames, subframes, time slots, mini-time slots, and symbols all represent time units for transmitting signals. Radio frames, subframes, time slots, mini-time slots, and symbols can also use their respective other names. Furthermore, the time units such as frames, subframes, time slots, mini-time slots, and symbols used in this disclosure can be used interchangeably.

[0243] For example, a subframe can also be called a TTI, multiple consecutive subframes can also be called a TTI, a time slot or a mini-time slot can also be called a TTI. That is to say, at least one of the subframe and TTI can be a subframe in the existing LTE (1ms), a period shorter than 1ms (e.g., 1-13 symbols), or a period longer than 1ms. In addition, the unit representing TTI may not be called a subframe, but a time slot, mini-time slot, etc.

[0244] Here, TTI refers, for example, to the smallest unit of time for scheduling in wireless communication. For instance, in an LTE system, the base station schedules radio resources (frequency bandwidth, transmit power, etc., available to each user terminal) in TTI units. However, the definition of TTI is not limited to this.

[0245] TTI can also be a unit of time for transmitting channel-coded data packets (transmission blocks), code blocks, codewords, etc., and can also be a unit of processing such as scheduling and link adaptation. In addition, when a TTI is given, the actual time interval (e.g., the number of symbols) mapped to transmission blocks, code blocks, codewords, etc. can be shorter than the TTI.

[0246] Furthermore, when a time slot or a mini-time slot is referred to as a TTI, more than one TTI (i.e., more than one time slot or more than one mini-time slot) can also serve as the minimum time unit for scheduling. In addition, the number of time slots (mini-time slots) constituting the minimum time unit of the schedule can also be controlled.

[0247] A Time Interval (TTI) with a duration of 1 ms can also be referred to as a normal TTI (TTI in 3GPP Rel.8-12), a standard TTI, a long TTI, a normal subframe, a standard subframe, a long subframe, a time slot, etc. A TTI shorter than a normal TTI can also be referred to as a shortened TTI, a short TTI, a partial TTI (partial or fractional TTI), a shortened subframe, a short subframe, a mini time slot, a sub-time slot, a time slot, etc.

[0248] In addition, long TTIs (e.g., normal TTIs, subframes, etc.) can be replaced with TTIs with a duration of more than 1 ms, and short TTIs (e.g., shortened TTIs, etc.) can be replaced with TTIs with a duration of less than long TTIs but more than 1 ms.

[0249] A resource block (RB) is a unit of resource allocation in the time and frequency domains. In the frequency domain, it can also contain one or more consecutive subcarriers. The number of subcarriers in an RB can be the same regardless of the parameter set, for example, it can be 12. The number of subcarriers in an RB can also be determined based on the parameter set.

[0250] Furthermore, an RB can contain one or more symbols in the time domain, and can also be a time slot, a mini-time slot, a subframe, or the length of a TTI. A TTI, a subframe, etc., can also be composed of one or more resource blocks.

[0251] In addition, one or more RBs can also be referred to as Physical Resource Blocks (PRBs), Sub-Carrier Groups (SCGs), Resource Element Groups (REGs), PRB pairs, RB pairs, etc.

[0252] Furthermore, a resource block can also consist of one or more resource elements (REs). For example, an RE can also be a radio resource area consisting of a subcarrier and a symbol.

[0253] The Bandwidth Part (BWP) (also referred to as partial bandwidth, etc.) can also represent a subset of consecutive common resource blocks (RBs) used for a certain parameter set in a certain carrier. Here, common RBs can also be determined by the index of RBs based on the common reference point of the carrier. PRBs can also be defined in a BWP and appended with numbers within that BWP.

[0254] A BWP can also include a UL BWP (BWP used by UL) and a DL BWP (BWP used by DL). For a UE, one or more BWPs can be set within a single carrier.

[0255] At least one of the configured BWPs can be active, and the UE may not intend to transmit or receive specific signals / channels outside of the active BWPs. Furthermore, terms such as "cell" and "carrier" in this disclosure can be replaced with "BWP".

[0256] Furthermore, the structures described above, such as radio frames, subframes, time slots, mini-time slots, and symbols, are merely illustrative. For example, the number of subframes contained in a radio frame, the number of time slots in each subframe or radio frame, the number of mini-time slots contained within a time slot, the number of symbols and RBs contained in a time slot or mini-time slot, the number of subcarriers contained in an RB, and the number of symbols in a TTI, symbol length, and cyclic prefix (CP) length can be varied in many ways.

[0257] Furthermore, the information, parameters, etc., described in this disclosure can be represented by absolute values, relative values ​​with respect to a specific value, or other corresponding information. For example, wireless resources can also be indicated by a specific index.

[0258] In this disclosure, the names used for parameters, etc., are not limiting names in any respect. Furthermore, the mathematical expressions, etc., using these parameters may differ from those explicitly disclosed in this disclosure. Various channels (PUCCH, PDCCH, etc.) and information elements can be identified by any suitable name; therefore, the various names assigned to these various channels and information elements are not limiting names in any respect.

[0259] The information, signals, etc., described in this disclosure can also be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc., which may be mentioned throughout the above description, can also be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any combination thereof.

[0260] Furthermore, information and signals can be output to at least one of the following: from a higher level (upper layer) to a lower level (lower layer), and from a lower level to a higher level. Information and signals can also be input and output via multiple network nodes.

[0261] Input and output information and signals can be stored in a specific location (such as memory) or managed using management tables. Input and output information and signals can be overwritten, updated, or appended. Output information and signals can also be deleted. Input information and signals can also be sent to other devices.

[0262] The notification of information is not limited to the methods / implementations described in this disclosure, and may also be carried out by other methods. For example, the notification of information in this disclosure may also be implemented through physical layer signaling (e.g., downlink control information (DCI), uplink control information (UCI), etc.), higher layer signaling (e.g., radio resource control (RRC) signaling, broadcast information (Master Information Block (MIB), System Information Block (SIB) etc.), medium access control (MAC) signaling), other signals, or combinations thereof.

[0263] In addition, physical layer signaling can also be referred to as Layer 1 / Layer 2 (L1 / L2) control information (L1 / L2 control signals), L1 control information (L1 control signals), etc. Furthermore, RRC signaling can also be referred to as RRC messages, such as RRC connection setup messages, RRC connection reconfiguration messages, etc. Additionally, MAC signaling can also be notified using, for example, the MAC control element (CE).

[0264] Furthermore, notification of specific information (e.g., a notification that “is X”) is not limited to explicit notification, but can also be implicit (e.g., by not providing that specific information, or by providing other information).

[0265] The determination can be made by a value represented by a single bit (0 or 1), by a true or false value (boolean), or by a numerical comparison (e.g., a comparison with a specific value).

[0266] Whether it is called software, firmware, middleware, microcode, hardware description language, or any other name, software should be broadly interpreted as instructions, instruction sets, code, code segments, program code, program, subprogram, software module, application, software application, software package, routine, subroutine, object, executable file, execution thread, process, function, etc.

[0267] Furthermore, software, instructions, and information can also be sent and received via a transmission medium. For example, when software is sent from a website, server, or other remote source using at least one of wired technologies (coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL) etc.) and wireless technologies (infrared, microwave, etc.), at least one of these wired and wireless technologies is included within the definition of a transmission medium.

[0268] The terms “system” and “network” as used in this disclosure are used interchangeably. “Network” may also mean devices included in a network (e.g., base stations).

[0269] In this disclosure, the terms "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", "beamwidth", "beam angle", "antenna", "antenna element", and "panel" are used interchangeably.

[0270] In this disclosure, the terms "Base Station (BS)", "Wireless Base Station", "Fixed Station", "NodeB", "eNB (eNodeB)", "gNB (gNodeB)", "Access Point", "Transmission Point (TP)", "Reception Point (RP)", "Transmission / Reception Point (TRP)", "Panel", "Cell", "Sector", "Cell Group", "Carrier", and "Component Carrier" are used interchangeably. There are also instances where the terms macrocell, small cell, femtocell, and picocell are used to refer to a base station.

[0271] A base station can accommodate one or more (e.g., three) cells. When a base station accommodates multiple cells, its coverage area can be divided into several smaller areas, each of which can provide communication services through a base station subsystem (e.g., a small indoor base station (Remote Radio Head (RRH))). Terms such as "cell" or "sector" refer to a portion or all of the coverage area of ​​at least one of the base station and base station subsystem providing communication services within that coverage area.

[0272] In this disclosure, the terms "Mobile Station (MS)", "user terminal", "User Equipment (UE)", and "terminal" are used interchangeably.

[0273] In some cases, 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, hand set, user agent, mobile client, client, or several other appropriate terms.

[0274] At least one of the base station and the mobile station can also be referred to as a transmitting device, a receiving device, a wireless communication device, etc. Additionally, at least one of the base station and the mobile station can also be a device mounted on a mobile body, the mobile body itself, etc. This mobile body can be a means of transportation (e.g., a vehicle, an airplane, etc.), a mobile body moving in an unmanned manner (e.g., a drone, an autonomous vehicle, etc.), or a robot (humanized or unmanned). Furthermore, at least one of the base station and the mobile station also includes devices that do not necessarily move during communication operations. For example, at least one of the base station and the mobile station can also be an Internet of Things (IoT) device such as a sensor.

[0275] Furthermore, the base station in this disclosure can also be replaced by a user terminal. For example, various methods / implementations of this disclosure can also be applied to a structure where the communication between the base station and the user terminal is replaced by communication between multiple user terminals (e.g., it can also be called device-to-device (D2D) or vehicle-to-everything (V2X)). In this case, it can also be configured such that the user terminal 20 has the functions of the base station 10 described above. In addition, expressions such as "uplink" and "downlink" can also be replaced with expressions corresponding to inter-terminal communication (e.g., "side"). For example, uplink channel, downlink channel, etc. can also be replaced with side channel.

[0276] Similarly, the user terminal in this disclosure can also be replaced by a base station. In this case, it can also be configured such that the base station 10 has the functions of the user terminal 20 described above.

[0277] In this disclosure, operations are assumed to be performed by the base station, and sometimes, depending on the circumstances, by its upper node. Clearly, in a network comprising one or more network nodes having a base station, various operations performed for communication with a terminal can be performed by the base station, one or more network nodes other than the base station (e.g., considering a Mobility Management Entity (MME), a Serving-Gateway (S-GW), etc., but not limited to these), or combinations thereof.

[0278] The various methods / implementations described in this disclosure can be used individually, in combination, or switched as needed during execution. Furthermore, the processing procedures, sequences, flowcharts, etc., of the various methods / implementations described in this disclosure can be rearranged as long as they do not contradict each other. For example, with respect to the methods described in this disclosure, the illustrated order is used to indicate various steps, but the order in which they are indicated is not limited.

[0279] The various methods / implementations described in this disclosure can also be applied to 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), Future Radio Access (FRA), New-Radio Access Technology (RAT), New Radio (NR), New radio access (NX), Futuregeneration radio access (FX), Global System for Mobile Communications (GSM), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE The terms include 802.20, Ultra-Wideband (UWB), Bluetooth (registered trademark), systems utilizing other appropriate wireless communication methods, and next-generation systems derived from them. Furthermore, multiple systems can be combined (e.g., LTE or LTE-A, combinations with 5G, etc.) for application.

[0280] As used in this disclosure, the word "based on" does not mean "based on only" unless otherwise specified. In other words, the word "based on" means both "based on only" and "based on at least".

[0281] Any reference to an element using the terms "first," "second," etc., as used in this disclosure does not comprehensively limit the quantity or order of these elements. These terms may be used in this disclosure as a convenient method of distinguishing between two or more elements. Therefore, references to the first and second elements do not imply that only two elements are permitted, or that the first element must take precedence over the second element in some form.

[0282] As used in this disclosure, the term "determining" can encompass a variety of operations in some cases. For example, "determining" can also be considered as making a "determination" regarding judging, calculating, computing, processing, deriving, investigating, searching (e.g., searching in a table, database, or other data structure), ascertaining, etc.

[0283] In addition, "judgment (decision)" can also be regarded as the situation of making "judgment (decision)" on receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, accessing (e.g., accessing data in memory), etc.

[0284] Furthermore, "judgment (decision)" can also be seen as making "judgments (decisions)" regarding resolving, selecting, choosing, establishing, and comparing. In other words, "judgment (decision)" can also be seen as making "judgments (decisions)" regarding certain actions.

[0285] In addition, “judgment (decision)” can also be replaced with “assuming”, “expecting”, “considering”, etc.

[0286] As used in this disclosure, the terms "connected," "coupled," or all variations thereof, mean any direct or indirect connection or combination between two or more elements, and can include cases where there is one or more intermediate elements between two mutually "connected" or "coupled" elements. The combination or connection between elements can be physical, logical, or a combination of these. For example, "connected" can also be replaced with "access."

[0287] In this disclosure, when connecting two elements, it is possible to consider using more than one wire, cable, printed electrical connection, etc., and as several non-limiting and non-inclusive examples, using electromagnetic energy with wavelengths in the wireless frequency domain, microwave region, light (both visible and invisible) region, to "connect" or "combine" them with each other.

[0288] In this disclosure, the term "A is different from B" can also mean "A and B are different from each other". Additionally, the term can also mean "A and B are different from C respectively". Terms such as "separate" and "combined" can also be interpreted as "different".

[0289] In this disclosure, the terms “include,” “including,” and variations thereof, as well as the term “comprising,” mean inclusiveness. Furthermore, the term “or” as used in this disclosure does not mean XOR.

[0290] In this disclosure, for example, in cases where articles are added through translation, such as a, an, and the in English, the disclosure may also include cases where the noun following these articles is in a plural form.

[0291] The inventions disclosed herein have been described in detail above. However, it will be apparent to those skilled in the art that the inventions are not limited to the embodiments described herein. The inventions disclosed herein can be implemented as modifications and variations without departing from the spirit and scope of the invention as defined by the claims. Therefore, the description in this disclosure is for illustrative purposes only and is not intended to limit the inventions disclosed herein in any way.

[0292] This application is based on Japanese Patent Application No. 2019-084681, filed on April 9, 2019. The entire contents of that application are included herein.

Claims

1. A terminal, the terminal being configured with multiple spatial relationship information (SRI) for measuring a reference signal resource set (SRS), the terminal having: The receiving unit receives SRS resource set setting information corresponding to the SRS resource set, and receives a Media Access Control (MAC) element for specifying the spatial relationship associated with the SRS resource set, wherein... The SRS resource set configuration information includes information about its purpose; as well as The control unit, when the MAC control element contains a field for an identifier of the SRS resource set and a field for an identifier of one of the plurality of SRIs, sends the spatial relationship specified by the one of the plurality of SRIs identified in the MAC control element to the SRS, independent of the SRS resources of the SRS resource set.

2. A wireless communication method for a terminal, said terminal being configured with multiple spatial relationship information (SRI) for measuring a reference signal resource set (SRS), the method comprising the following steps: Receive SRS resource set setting information corresponding to the SRS resource set, and receive a Media Access Control (MAC) element for specifying the spatial relationship associated with the SRS resource set, wherein, The SRS resource set configuration information includes information about its purpose; as well as When the MAC control element contains a field for an identifier of the SRS resource set and a field for an identifier of one of the plurality of SRIs, the SRS is sent to the SRS with the spatial relationship specified by the one of the plurality of SRIs identified in the MAC control element, regardless of the SRS resources of the SRS resource set.

3. A base station, comprising: The transmitting unit sends SRS resource set setting information corresponding to the SRS resource set to a terminal that has been configured with multiple spatial relationship information SRIs for measurement reference signal SRS resource sets, and sends a Media Access Control (MAC) control element for specifying the spatial relationship associated with the SRS resource set, wherein... The SRS resource set configuration information includes information about its purpose; as well as The receiving unit receives, when the MAC control element contains a field for an identifier of the SRS resource set and a field for an identifier of one of the plurality of SRIs, the SRS transmission sent by the terminal applying the spatial relationship specified by the one of the plurality of SRIs identified in the MAC control element to the SRS transmission.

4. A system comprising the terminal as described in claim 1 and the base station as described in claim 3.

Images